1f870fa0bSMat Martineau // SPDX-License-Identifier: GPL-2.0
2f870fa0bSMat Martineau /* Multipath TCP
3f870fa0bSMat Martineau *
4f870fa0bSMat Martineau * Copyright (c) 2017 - 2019, Intel Corporation.
5f870fa0bSMat Martineau */
6f870fa0bSMat Martineau
7f870fa0bSMat Martineau #define pr_fmt(fmt) "MPTCP: " fmt
8f870fa0bSMat Martineau
9f870fa0bSMat Martineau #include <linux/kernel.h>
10f870fa0bSMat Martineau #include <linux/module.h>
11f870fa0bSMat Martineau #include <linux/netdevice.h>
127a6a6cbcSPaolo Abeni #include <linux/sched/signal.h>
137a6a6cbcSPaolo Abeni #include <linux/atomic.h>
14f870fa0bSMat Martineau #include <net/sock.h>
15f870fa0bSMat Martineau #include <net/inet_common.h>
16f870fa0bSMat Martineau #include <net/inet_hashtables.h>
17f870fa0bSMat Martineau #include <net/protocol.h>
18f870fa0bSMat Martineau #include <net/tcp.h>
193721b9b6SMat Martineau #include <net/tcp_states.h>
20cf7da0d6SPeter Krystad #if IS_ENABLED(CONFIG_MPTCP_IPV6)
21cf7da0d6SPeter Krystad #include <net/transp_v6.h>
22cf7da0d6SPeter Krystad #endif
23f870fa0bSMat Martineau #include <net/mptcp.h>
24e16163b6SPaolo Abeni #include <net/xfrm.h>
25644807e3SFlorian Westphal #include <asm/ioctls.h>
26f870fa0bSMat Martineau #include "protocol.h"
27fc518953SFlorian Westphal #include "mib.h"
28f870fa0bSMat Martineau
29e10a9892SGeliang Tang #define CREATE_TRACE_POINTS
30e10a9892SGeliang Tang #include <trace/events/mptcp.h>
31e10a9892SGeliang Tang
32b0519de8SFlorian Westphal #if IS_ENABLED(CONFIG_MPTCP_IPV6)
33b0519de8SFlorian Westphal struct mptcp6_sock {
34b0519de8SFlorian Westphal struct mptcp_sock msk;
35b0519de8SFlorian Westphal struct ipv6_pinfo np;
36b0519de8SFlorian Westphal };
37b0519de8SFlorian Westphal #endif
38b0519de8SFlorian Westphal
39b7f653b2SFlorian Westphal enum {
40b7f653b2SFlorian Westphal MPTCP_CMSG_TS = BIT(0),
412c9e7765SFlorian Westphal MPTCP_CMSG_INQ = BIT(1),
42b7f653b2SFlorian Westphal };
43b7f653b2SFlorian Westphal
4491b6d325SEric Dumazet static struct percpu_counter mptcp_sockets_allocated ____cacheline_aligned_in_smp;
45d027236cSPaolo Abeni
46e16163b6SPaolo Abeni static void __mptcp_destroy_sock(struct sock *sk);
4781c1d029SPaolo Abeni static void mptcp_check_send_data_fin(struct sock *sk);
48e16163b6SPaolo Abeni
49b19bc294SPaolo Abeni DEFINE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
50b19bc294SPaolo Abeni static struct net_device mptcp_napi_dev;
51b19bc294SPaolo Abeni
526f8a612aSFlorian Westphal /* Returns end sequence number of the receiver's advertised window */
mptcp_wnd_end(const struct mptcp_sock * msk)536f8a612aSFlorian Westphal static u64 mptcp_wnd_end(const struct mptcp_sock *msk)
546f8a612aSFlorian Westphal {
557439d687SPaolo Abeni return READ_ONCE(msk->wnd_end);
566f8a612aSFlorian Westphal }
576f8a612aSFlorian Westphal
mptcp_fallback_tcp_ops(const struct sock * sk)5812f353faSDavide Caratti static const struct proto_ops *mptcp_fallback_tcp_ops(const struct sock *sk)
590b4f33deSFlorian Westphal {
600b4f33deSFlorian Westphal #if IS_ENABLED(CONFIG_MPTCP_IPV6)
6112f353faSDavide Caratti if (sk->sk_prot == &tcpv6_prot)
6212f353faSDavide Caratti return &inet6_stream_ops;
630b4f33deSFlorian Westphal #endif
6412f353faSDavide Caratti WARN_ON_ONCE(sk->sk_prot != &tcp_prot);
6512f353faSDavide Caratti return &inet_stream_ops;
660b4f33deSFlorian Westphal }
670b4f33deSFlorian Westphal
__mptcp_socket_create(struct mptcp_sock * msk)68fa68018dSPaolo Abeni static int __mptcp_socket_create(struct mptcp_sock *msk)
692303f994SPeter Krystad {
702303f994SPeter Krystad struct mptcp_subflow_context *subflow;
712303f994SPeter Krystad struct sock *sk = (struct sock *)msk;
722303f994SPeter Krystad struct socket *ssock;
732303f994SPeter Krystad int err;
742303f994SPeter Krystad
756bc1fe7dSPaolo Abeni err = mptcp_subflow_create_socket(sk, sk->sk_family, &ssock);
762303f994SPeter Krystad if (err)
77fa68018dSPaolo Abeni return err;
782303f994SPeter Krystad
79b8dc6d6cSPaolo Abeni msk->scaling_ratio = tcp_sk(ssock->sk)->scaling_ratio;
801b1b43eeSPaolo Abeni WRITE_ONCE(msk->first, ssock->sk);
812303f994SPeter Krystad subflow = mptcp_subflow_ctx(ssock->sk);
82cec37a6eSPeter Krystad list_add(&subflow->node, &msk->conn_list);
83e16163b6SPaolo Abeni sock_hold(ssock->sk);
842303f994SPeter Krystad subflow->request_mptcp = 1;
856f06b4d4SPaolo Abeni subflow->subflow_id = msk->subflow_id++;
864cf86ae8SPaolo Abeni
874cf86ae8SPaolo Abeni /* This is the first subflow, always with id 0 */
88ba2cf922SPaolo Abeni WRITE_ONCE(subflow->local_id, 0);
89866f26f2SPaolo Abeni mptcp_sock_graft(msk->first, sk->sk_socket);
9039880bd8SPaolo Abeni iput(SOCK_INODE(ssock));
91e1ff9e82SDavide Caratti
92fa68018dSPaolo Abeni return 0;
932303f994SPeter Krystad }
942303f994SPeter Krystad
95ddb1a072SPaolo Abeni /* If the MPC handshake is not started, returns the first subflow,
96ddb1a072SPaolo Abeni * eventually allocating it.
97ddb1a072SPaolo Abeni */
__mptcp_nmpc_sk(struct mptcp_sock * msk)983f326a82SPaolo Abeni struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk)
99ddb1a072SPaolo Abeni {
100ddb1a072SPaolo Abeni struct sock *sk = (struct sock *)msk;
101ddb1a072SPaolo Abeni int ret;
102ddb1a072SPaolo Abeni
103ddb1a072SPaolo Abeni if (!((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)))
104ddb1a072SPaolo Abeni return ERR_PTR(-EINVAL);
105ddb1a072SPaolo Abeni
1063f326a82SPaolo Abeni if (!msk->first) {
107ddb1a072SPaolo Abeni ret = __mptcp_socket_create(msk);
108ddb1a072SPaolo Abeni if (ret)
109ddb1a072SPaolo Abeni return ERR_PTR(ret);
110ddb1a072SPaolo Abeni
111ddb1a072SPaolo Abeni mptcp_sockopt_sync(msk, msk->first);
112ddb1a072SPaolo Abeni }
113ddb1a072SPaolo Abeni
1143f326a82SPaolo Abeni return msk->first;
115ddb1a072SPaolo Abeni }
116ddb1a072SPaolo Abeni
mptcp_drop(struct sock * sk,struct sk_buff * skb)117ab174ad8SPaolo Abeni static void mptcp_drop(struct sock *sk, struct sk_buff *skb)
118ab174ad8SPaolo Abeni {
119ab174ad8SPaolo Abeni sk_drops_add(sk, skb);
120ab174ad8SPaolo Abeni __kfree_skb(skb);
121ab174ad8SPaolo Abeni }
122ab174ad8SPaolo Abeni
mptcp_rmem_fwd_alloc_add(struct sock * sk,int size)1239531e4a8SEric Dumazet static void mptcp_rmem_fwd_alloc_add(struct sock *sk, int size)
1249531e4a8SEric Dumazet {
1259531e4a8SEric Dumazet WRITE_ONCE(mptcp_sk(sk)->rmem_fwd_alloc,
1269531e4a8SEric Dumazet mptcp_sk(sk)->rmem_fwd_alloc + size);
1279531e4a8SEric Dumazet }
1289531e4a8SEric Dumazet
mptcp_rmem_charge(struct sock * sk,int size)1296511882cSPaolo Abeni static void mptcp_rmem_charge(struct sock *sk, int size)
1306511882cSPaolo Abeni {
1319531e4a8SEric Dumazet mptcp_rmem_fwd_alloc_add(sk, -size);
1326511882cSPaolo Abeni }
1336511882cSPaolo Abeni
mptcp_try_coalesce(struct sock * sk,struct sk_buff * to,struct sk_buff * from)1348268ed4cSPaolo Abeni static bool mptcp_try_coalesce(struct sock *sk, struct sk_buff *to,
1358268ed4cSPaolo Abeni struct sk_buff *from)
1368268ed4cSPaolo Abeni {
1378268ed4cSPaolo Abeni bool fragstolen;
1388268ed4cSPaolo Abeni int delta;
1398268ed4cSPaolo Abeni
1408268ed4cSPaolo Abeni if (MPTCP_SKB_CB(from)->offset ||
1418268ed4cSPaolo Abeni !skb_try_coalesce(to, from, &fragstolen, &delta))
1428268ed4cSPaolo Abeni return false;
1438268ed4cSPaolo Abeni
14406242e44SPaolo Abeni pr_debug("colesced seq %llx into %llx new len %d new end seq %llx",
14506242e44SPaolo Abeni MPTCP_SKB_CB(from)->map_seq, MPTCP_SKB_CB(to)->map_seq,
14606242e44SPaolo Abeni to->len, MPTCP_SKB_CB(from)->end_seq);
147ab174ad8SPaolo Abeni MPTCP_SKB_CB(to)->end_seq = MPTCP_SKB_CB(from)->end_seq;
1487288ff6eSPaolo Abeni
1497288ff6eSPaolo Abeni /* note the fwd memory can reach a negative value after accounting
1507288ff6eSPaolo Abeni * for the delta, but the later skb free will restore a non
1517288ff6eSPaolo Abeni * negative one
1527288ff6eSPaolo Abeni */
1538268ed4cSPaolo Abeni atomic_add(delta, &sk->sk_rmem_alloc);
1546511882cSPaolo Abeni mptcp_rmem_charge(sk, delta);
1557288ff6eSPaolo Abeni kfree_skb_partial(from, fragstolen);
1567288ff6eSPaolo Abeni
1578268ed4cSPaolo Abeni return true;
1588268ed4cSPaolo Abeni }
1598268ed4cSPaolo Abeni
mptcp_ooo_try_coalesce(struct mptcp_sock * msk,struct sk_buff * to,struct sk_buff * from)160ab174ad8SPaolo Abeni static bool mptcp_ooo_try_coalesce(struct mptcp_sock *msk, struct sk_buff *to,
161ab174ad8SPaolo Abeni struct sk_buff *from)
1626771bfd9SFlorian Westphal {
163ab174ad8SPaolo Abeni if (MPTCP_SKB_CB(from)->map_seq != MPTCP_SKB_CB(to)->end_seq)
164ab174ad8SPaolo Abeni return false;
165ab174ad8SPaolo Abeni
166ab174ad8SPaolo Abeni return mptcp_try_coalesce((struct sock *)msk, to, from);
167ab174ad8SPaolo Abeni }
168ab174ad8SPaolo Abeni
__mptcp_rmem_reclaim(struct sock * sk,int amount)1696511882cSPaolo Abeni static void __mptcp_rmem_reclaim(struct sock *sk, int amount)
1706511882cSPaolo Abeni {
171100fdd1fSEric Dumazet amount >>= PAGE_SHIFT;
1729531e4a8SEric Dumazet mptcp_rmem_charge(sk, amount << PAGE_SHIFT);
1736511882cSPaolo Abeni __sk_mem_reduce_allocated(sk, amount);
1746511882cSPaolo Abeni }
1756511882cSPaolo Abeni
mptcp_rmem_uncharge(struct sock * sk,int size)1766511882cSPaolo Abeni static void mptcp_rmem_uncharge(struct sock *sk, int size)
1776511882cSPaolo Abeni {
1786511882cSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
1796511882cSPaolo Abeni int reclaimable;
1806511882cSPaolo Abeni
1819531e4a8SEric Dumazet mptcp_rmem_fwd_alloc_add(sk, size);
1826511882cSPaolo Abeni reclaimable = msk->rmem_fwd_alloc - sk_unused_reserved_mem(sk);
1836511882cSPaolo Abeni
1846511882cSPaolo Abeni /* see sk_mem_uncharge() for the rationale behind the following schema */
185d24141feSPaolo Abeni if (unlikely(reclaimable >= PAGE_SIZE))
186d24141feSPaolo Abeni __mptcp_rmem_reclaim(sk, reclaimable);
1876511882cSPaolo Abeni }
1886511882cSPaolo Abeni
mptcp_rfree(struct sk_buff * skb)1896511882cSPaolo Abeni static void mptcp_rfree(struct sk_buff *skb)
1906511882cSPaolo Abeni {
1916511882cSPaolo Abeni unsigned int len = skb->truesize;
1926511882cSPaolo Abeni struct sock *sk = skb->sk;
1936511882cSPaolo Abeni
1946511882cSPaolo Abeni atomic_sub(len, &sk->sk_rmem_alloc);
1956511882cSPaolo Abeni mptcp_rmem_uncharge(sk, len);
1966511882cSPaolo Abeni }
1976511882cSPaolo Abeni
mptcp_set_owner_r(struct sk_buff * skb,struct sock * sk)19836b122baSDmytro Shytyi void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk)
1996511882cSPaolo Abeni {
2006511882cSPaolo Abeni skb_orphan(skb);
2016511882cSPaolo Abeni skb->sk = sk;
2026511882cSPaolo Abeni skb->destructor = mptcp_rfree;
2036511882cSPaolo Abeni atomic_add(skb->truesize, &sk->sk_rmem_alloc);
2046511882cSPaolo Abeni mptcp_rmem_charge(sk, skb->truesize);
2056511882cSPaolo Abeni }
2066511882cSPaolo Abeni
207ab174ad8SPaolo Abeni /* "inspired" by tcp_data_queue_ofo(), main differences:
208ab174ad8SPaolo Abeni * - use mptcp seqs
209ab174ad8SPaolo Abeni * - don't cope with sacks
210ab174ad8SPaolo Abeni */
mptcp_data_queue_ofo(struct mptcp_sock * msk,struct sk_buff * skb)211ab174ad8SPaolo Abeni static void mptcp_data_queue_ofo(struct mptcp_sock *msk, struct sk_buff *skb)
212ab174ad8SPaolo Abeni {
213ab174ad8SPaolo Abeni struct sock *sk = (struct sock *)msk;
214ab174ad8SPaolo Abeni struct rb_node **p, *parent;
215ab174ad8SPaolo Abeni u64 seq, end_seq, max_seq;
216ab174ad8SPaolo Abeni struct sk_buff *skb1;
217ab174ad8SPaolo Abeni
218ab174ad8SPaolo Abeni seq = MPTCP_SKB_CB(skb)->map_seq;
219ab174ad8SPaolo Abeni end_seq = MPTCP_SKB_CB(skb)->end_seq;
220f3589be0SPaolo Abeni max_seq = atomic64_read(&msk->rcv_wnd_sent);
221ab174ad8SPaolo Abeni
22206242e44SPaolo Abeni pr_debug("msk=%p seq=%llx limit=%llx empty=%d", msk, seq, max_seq,
22306242e44SPaolo Abeni RB_EMPTY_ROOT(&msk->out_of_order_queue));
224fa3fe2b1SFlorian Westphal if (after64(end_seq, max_seq)) {
225ab174ad8SPaolo Abeni /* out of window */
226ab174ad8SPaolo Abeni mptcp_drop(sk, skb);
227fa3fe2b1SFlorian Westphal pr_debug("oow by %lld, rcv_wnd_sent %llu\n",
228fa3fe2b1SFlorian Westphal (unsigned long long)end_seq - (unsigned long)max_seq,
229f3589be0SPaolo Abeni (unsigned long long)atomic64_read(&msk->rcv_wnd_sent));
23006242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_NODSSWINDOW);
231ab174ad8SPaolo Abeni return;
232ab174ad8SPaolo Abeni }
233ab174ad8SPaolo Abeni
234ab174ad8SPaolo Abeni p = &msk->out_of_order_queue.rb_node;
23506242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUE);
236ab174ad8SPaolo Abeni if (RB_EMPTY_ROOT(&msk->out_of_order_queue)) {
237ab174ad8SPaolo Abeni rb_link_node(&skb->rbnode, NULL, p);
238ab174ad8SPaolo Abeni rb_insert_color(&skb->rbnode, &msk->out_of_order_queue);
239ab174ad8SPaolo Abeni msk->ooo_last_skb = skb;
240ab174ad8SPaolo Abeni goto end;
241ab174ad8SPaolo Abeni }
242ab174ad8SPaolo Abeni
243ab174ad8SPaolo Abeni /* with 2 subflows, adding at end of ooo queue is quite likely
244ab174ad8SPaolo Abeni * Use of ooo_last_skb avoids the O(Log(N)) rbtree lookup.
245ab174ad8SPaolo Abeni */
24606242e44SPaolo Abeni if (mptcp_ooo_try_coalesce(msk, msk->ooo_last_skb, skb)) {
24706242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE);
24806242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL);
249ab174ad8SPaolo Abeni return;
25006242e44SPaolo Abeni }
251ab174ad8SPaolo Abeni
252ab174ad8SPaolo Abeni /* Can avoid an rbtree lookup if we are adding skb after ooo_last_skb */
253ab174ad8SPaolo Abeni if (!before64(seq, MPTCP_SKB_CB(msk->ooo_last_skb)->end_seq)) {
25406242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL);
255ab174ad8SPaolo Abeni parent = &msk->ooo_last_skb->rbnode;
256ab174ad8SPaolo Abeni p = &parent->rb_right;
257ab174ad8SPaolo Abeni goto insert;
258ab174ad8SPaolo Abeni }
259ab174ad8SPaolo Abeni
260ab174ad8SPaolo Abeni /* Find place to insert this segment. Handle overlaps on the way. */
261ab174ad8SPaolo Abeni parent = NULL;
262ab174ad8SPaolo Abeni while (*p) {
263ab174ad8SPaolo Abeni parent = *p;
264ab174ad8SPaolo Abeni skb1 = rb_to_skb(parent);
265ab174ad8SPaolo Abeni if (before64(seq, MPTCP_SKB_CB(skb1)->map_seq)) {
266ab174ad8SPaolo Abeni p = &parent->rb_left;
267ab174ad8SPaolo Abeni continue;
268ab174ad8SPaolo Abeni }
269ab174ad8SPaolo Abeni if (before64(seq, MPTCP_SKB_CB(skb1)->end_seq)) {
270ab174ad8SPaolo Abeni if (!after64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) {
271ab174ad8SPaolo Abeni /* All the bits are present. Drop. */
272ab174ad8SPaolo Abeni mptcp_drop(sk, skb);
27306242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA);
274ab174ad8SPaolo Abeni return;
275ab174ad8SPaolo Abeni }
276ab174ad8SPaolo Abeni if (after64(seq, MPTCP_SKB_CB(skb1)->map_seq)) {
277ab174ad8SPaolo Abeni /* partial overlap:
278ab174ad8SPaolo Abeni * | skb |
279ab174ad8SPaolo Abeni * | skb1 |
280ab174ad8SPaolo Abeni * continue traversing
281ab174ad8SPaolo Abeni */
282ab174ad8SPaolo Abeni } else {
283ab174ad8SPaolo Abeni /* skb's seq == skb1's seq and skb covers skb1.
284ab174ad8SPaolo Abeni * Replace skb1 with skb.
285ab174ad8SPaolo Abeni */
286ab174ad8SPaolo Abeni rb_replace_node(&skb1->rbnode, &skb->rbnode,
287ab174ad8SPaolo Abeni &msk->out_of_order_queue);
288ab174ad8SPaolo Abeni mptcp_drop(sk, skb1);
28906242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA);
290ab174ad8SPaolo Abeni goto merge_right;
291ab174ad8SPaolo Abeni }
292ab174ad8SPaolo Abeni } else if (mptcp_ooo_try_coalesce(msk, skb1, skb)) {
29306242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE);
294ab174ad8SPaolo Abeni return;
295ab174ad8SPaolo Abeni }
296ab174ad8SPaolo Abeni p = &parent->rb_right;
297ab174ad8SPaolo Abeni }
29806242e44SPaolo Abeni
299ab174ad8SPaolo Abeni insert:
300ab174ad8SPaolo Abeni /* Insert segment into RB tree. */
301ab174ad8SPaolo Abeni rb_link_node(&skb->rbnode, parent, p);
302ab174ad8SPaolo Abeni rb_insert_color(&skb->rbnode, &msk->out_of_order_queue);
303ab174ad8SPaolo Abeni
304ab174ad8SPaolo Abeni merge_right:
305ab174ad8SPaolo Abeni /* Remove other segments covered by skb. */
306ab174ad8SPaolo Abeni while ((skb1 = skb_rb_next(skb)) != NULL) {
307ab174ad8SPaolo Abeni if (before64(end_seq, MPTCP_SKB_CB(skb1)->end_seq))
308ab174ad8SPaolo Abeni break;
309ab174ad8SPaolo Abeni rb_erase(&skb1->rbnode, &msk->out_of_order_queue);
310ab174ad8SPaolo Abeni mptcp_drop(sk, skb1);
31106242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA);
312ab174ad8SPaolo Abeni }
313ab174ad8SPaolo Abeni /* If there is no skb after us, we are the last_skb ! */
314ab174ad8SPaolo Abeni if (!skb1)
315ab174ad8SPaolo Abeni msk->ooo_last_skb = skb;
316ab174ad8SPaolo Abeni
317ab174ad8SPaolo Abeni end:
318ab174ad8SPaolo Abeni skb_condense(skb);
3196511882cSPaolo Abeni mptcp_set_owner_r(skb, sk);
3206511882cSPaolo Abeni }
3216511882cSPaolo Abeni
mptcp_rmem_schedule(struct sock * sk,struct sock * ssk,int size)3226511882cSPaolo Abeni static bool mptcp_rmem_schedule(struct sock *sk, struct sock *ssk, int size)
3236511882cSPaolo Abeni {
3246511882cSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
3256511882cSPaolo Abeni int amt, amount;
3266511882cSPaolo Abeni
32769d93daeSPaolo Abeni if (size <= msk->rmem_fwd_alloc)
3286511882cSPaolo Abeni return true;
3296511882cSPaolo Abeni
33069d93daeSPaolo Abeni size -= msk->rmem_fwd_alloc;
3316511882cSPaolo Abeni amt = sk_mem_pages(size);
332100fdd1fSEric Dumazet amount = amt << PAGE_SHIFT;
3334aaa1685SPaolo Abeni if (!__sk_mem_raise_allocated(sk, size, amt, SK_MEM_RECV))
3346511882cSPaolo Abeni return false;
3356511882cSPaolo Abeni
3369531e4a8SEric Dumazet mptcp_rmem_fwd_alloc_add(sk, amount);
3376511882cSPaolo Abeni return true;
338ab174ad8SPaolo Abeni }
339ab174ad8SPaolo Abeni
__mptcp_move_skb(struct mptcp_sock * msk,struct sock * ssk,struct sk_buff * skb,unsigned int offset,size_t copy_len)340ab174ad8SPaolo Abeni static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
341ab174ad8SPaolo Abeni struct sk_buff *skb, unsigned int offset,
342ab174ad8SPaolo Abeni size_t copy_len)
343ab174ad8SPaolo Abeni {
344ab174ad8SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
3456771bfd9SFlorian Westphal struct sock *sk = (struct sock *)msk;
3464e637c70SFlorian Westphal struct sk_buff *tail;
347b7f653b2SFlorian Westphal bool has_rxtstamp;
3486771bfd9SFlorian Westphal
3496771bfd9SFlorian Westphal __skb_unlink(skb, &ssk->sk_receive_queue);
3504e637c70SFlorian Westphal
3514e637c70SFlorian Westphal skb_ext_reset(skb);
3524e637c70SFlorian Westphal skb_orphan(skb);
3534e637c70SFlorian Westphal
3549c3f94e1SPaolo Abeni /* try to fetch required memory from subflow */
3556511882cSPaolo Abeni if (!mptcp_rmem_schedule(sk, ssk, skb->truesize))
3569c3f94e1SPaolo Abeni goto drop;
35772f96132SPaolo Abeni
358b7f653b2SFlorian Westphal has_rxtstamp = TCP_SKB_CB(skb)->has_rxtstamp;
359b7f653b2SFlorian Westphal
360ab174ad8SPaolo Abeni /* the skb map_seq accounts for the skb offset:
361ab174ad8SPaolo Abeni * mptcp_subflow_get_mapped_dsn() is based on the current tp->copied_seq
362ab174ad8SPaolo Abeni * value
363ab174ad8SPaolo Abeni */
364ab174ad8SPaolo Abeni MPTCP_SKB_CB(skb)->map_seq = mptcp_subflow_get_mapped_dsn(subflow);
365ab174ad8SPaolo Abeni MPTCP_SKB_CB(skb)->end_seq = MPTCP_SKB_CB(skb)->map_seq + copy_len;
366ab174ad8SPaolo Abeni MPTCP_SKB_CB(skb)->offset = offset;
367b7f653b2SFlorian Westphal MPTCP_SKB_CB(skb)->has_rxtstamp = has_rxtstamp;
368ab174ad8SPaolo Abeni
369ab174ad8SPaolo Abeni if (MPTCP_SKB_CB(skb)->map_seq == msk->ack_seq) {
370ab174ad8SPaolo Abeni /* in sequence */
37138967f42SPaolo Abeni msk->bytes_received += copy_len;
372917944daSMat Martineau WRITE_ONCE(msk->ack_seq, msk->ack_seq + copy_len);
3734e637c70SFlorian Westphal tail = skb_peek_tail(&sk->sk_receive_queue);
3748268ed4cSPaolo Abeni if (tail && mptcp_try_coalesce(sk, tail, skb))
375ab174ad8SPaolo Abeni return true;
3764e637c70SFlorian Westphal
3776511882cSPaolo Abeni mptcp_set_owner_r(skb, sk);
3786771bfd9SFlorian Westphal __skb_queue_tail(&sk->sk_receive_queue, skb);
379ab174ad8SPaolo Abeni return true;
380ab174ad8SPaolo Abeni } else if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) {
381ab174ad8SPaolo Abeni mptcp_data_queue_ofo(msk, skb);
382ab174ad8SPaolo Abeni return false;
383ab174ad8SPaolo Abeni }
384ab174ad8SPaolo Abeni
385ab174ad8SPaolo Abeni /* old data, keep it simple and drop the whole pkt, sender
386ab174ad8SPaolo Abeni * will retransmit as needed, if needed.
387ab174ad8SPaolo Abeni */
38806242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA);
3899c3f94e1SPaolo Abeni drop:
390ab174ad8SPaolo Abeni mptcp_drop(sk, skb);
391ab174ad8SPaolo Abeni return false;
3926771bfd9SFlorian Westphal }
3936771bfd9SFlorian Westphal
mptcp_stop_rtx_timer(struct sock * sk)394f6909dc1SPaolo Abeni static void mptcp_stop_rtx_timer(struct sock *sk)
39516a9a9daSMat Martineau {
39616a9a9daSMat Martineau struct inet_connection_sock *icsk = inet_csk(sk);
39716a9a9daSMat Martineau
39816a9a9daSMat Martineau sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
39916a9a9daSMat Martineau mptcp_sk(sk)->timer_ival = 0;
40016a9a9daSMat Martineau }
40116a9a9daSMat Martineau
mptcp_close_wake_up(struct sock * sk)402e16163b6SPaolo Abeni static void mptcp_close_wake_up(struct sock *sk)
403e16163b6SPaolo Abeni {
404e16163b6SPaolo Abeni if (sock_flag(sk, SOCK_DEAD))
405e16163b6SPaolo Abeni return;
406e16163b6SPaolo Abeni
407e16163b6SPaolo Abeni sk->sk_state_change(sk);
408e16163b6SPaolo Abeni if (sk->sk_shutdown == SHUTDOWN_MASK ||
409e16163b6SPaolo Abeni sk->sk_state == TCP_CLOSE)
410e16163b6SPaolo Abeni sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP);
411e16163b6SPaolo Abeni else
412e16163b6SPaolo Abeni sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
413e16163b6SPaolo Abeni }
414e16163b6SPaolo Abeni
mptcp_pending_data_fin_ack(struct sock * sk)4156e628cd3SPaolo Abeni static bool mptcp_pending_data_fin_ack(struct sock *sk)
4166e628cd3SPaolo Abeni {
4176e628cd3SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
4186e628cd3SPaolo Abeni
41981c1d029SPaolo Abeni return ((1 << sk->sk_state) &
4206e628cd3SPaolo Abeni (TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK)) &&
4216e628cd3SPaolo Abeni msk->write_seq == READ_ONCE(msk->snd_una);
4226e628cd3SPaolo Abeni }
4236e628cd3SPaolo Abeni
mptcp_check_data_fin_ack(struct sock * sk)42416a9a9daSMat Martineau static void mptcp_check_data_fin_ack(struct sock *sk)
42516a9a9daSMat Martineau {
42616a9a9daSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk);
42716a9a9daSMat Martineau
42816a9a9daSMat Martineau /* Look for an acknowledged DATA_FIN */
4296e628cd3SPaolo Abeni if (mptcp_pending_data_fin_ack(sk)) {
43016a9a9daSMat Martineau WRITE_ONCE(msk->snd_data_fin_enable, 0);
43116a9a9daSMat Martineau
43216a9a9daSMat Martineau switch (sk->sk_state) {
43316a9a9daSMat Martineau case TCP_FIN_WAIT1:
434d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_FIN_WAIT2);
43516a9a9daSMat Martineau break;
43616a9a9daSMat Martineau case TCP_CLOSING:
43716a9a9daSMat Martineau case TCP_LAST_ACK:
438d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
43916a9a9daSMat Martineau break;
44016a9a9daSMat Martineau }
44116a9a9daSMat Martineau
442e16163b6SPaolo Abeni mptcp_close_wake_up(sk);
44316a9a9daSMat Martineau }
44416a9a9daSMat Martineau }
44516a9a9daSMat Martineau
mptcp_pending_data_fin(struct sock * sk,u64 * seq)4463721b9b6SMat Martineau static bool mptcp_pending_data_fin(struct sock *sk, u64 *seq)
4473721b9b6SMat Martineau {
4483721b9b6SMat Martineau struct mptcp_sock *msk = mptcp_sk(sk);
4493721b9b6SMat Martineau
4503721b9b6SMat Martineau if (READ_ONCE(msk->rcv_data_fin) &&
4513721b9b6SMat Martineau ((1 << sk->sk_state) &
4523721b9b6SMat Martineau (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2))) {
4533721b9b6SMat Martineau u64 rcv_data_fin_seq = READ_ONCE(msk->rcv_data_fin_seq);
4543721b9b6SMat Martineau
4553721b9b6SMat Martineau if (msk->ack_seq == rcv_data_fin_seq) {
4563721b9b6SMat Martineau if (seq)
4573721b9b6SMat Martineau *seq = rcv_data_fin_seq;
4583721b9b6SMat Martineau
4593721b9b6SMat Martineau return true;
4603721b9b6SMat Martineau }
4613721b9b6SMat Martineau }
4623721b9b6SMat Martineau
4633721b9b6SMat Martineau return false;
4643721b9b6SMat Martineau }
4653721b9b6SMat Martineau
mptcp_set_datafin_timeout(struct sock * sk)466403a40f2SEric Dumazet static void mptcp_set_datafin_timeout(struct sock *sk)
4676477dd39SMat Martineau {
4686477dd39SMat Martineau struct inet_connection_sock *icsk = inet_csk(sk);
469877d11f0SMat Martineau u32 retransmits;
4706477dd39SMat Martineau
471877d11f0SMat Martineau retransmits = min_t(u32, icsk->icsk_retransmits,
472877d11f0SMat Martineau ilog2(TCP_RTO_MAX / TCP_RTO_MIN));
473877d11f0SMat Martineau
474877d11f0SMat Martineau mptcp_sk(sk)->timer_ival = TCP_RTO_MIN << retransmits;
4756477dd39SMat Martineau }
4766477dd39SMat Martineau
__mptcp_set_timeout(struct sock * sk,long tout)47733d41c9cSPaolo Abeni static void __mptcp_set_timeout(struct sock *sk, long tout)
4783721b9b6SMat Martineau {
4793721b9b6SMat Martineau mptcp_sk(sk)->timer_ival = tout > 0 ? tout : TCP_RTO_MIN;
4803721b9b6SMat Martineau }
4813721b9b6SMat Martineau
mptcp_timeout_from_subflow(const struct mptcp_subflow_context * subflow)48233d41c9cSPaolo Abeni static long mptcp_timeout_from_subflow(const struct mptcp_subflow_context *subflow)
48333d41c9cSPaolo Abeni {
48433d41c9cSPaolo Abeni const struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
48533d41c9cSPaolo Abeni
48671b7dec2SPaolo Abeni return inet_csk(ssk)->icsk_pending && !subflow->stale_count ?
48771b7dec2SPaolo Abeni inet_csk(ssk)->icsk_timeout - jiffies : 0;
48833d41c9cSPaolo Abeni }
48933d41c9cSPaolo Abeni
mptcp_set_timeout(struct sock * sk)49033d41c9cSPaolo Abeni static void mptcp_set_timeout(struct sock *sk)
49133d41c9cSPaolo Abeni {
49233d41c9cSPaolo Abeni struct mptcp_subflow_context *subflow;
49333d41c9cSPaolo Abeni long tout = 0;
49433d41c9cSPaolo Abeni
49533d41c9cSPaolo Abeni mptcp_for_each_subflow(mptcp_sk(sk), subflow)
49633d41c9cSPaolo Abeni tout = max(tout, mptcp_timeout_from_subflow(subflow));
49733d41c9cSPaolo Abeni __mptcp_set_timeout(sk, tout);
49833d41c9cSPaolo Abeni }
49933d41c9cSPaolo Abeni
tcp_can_send_ack(const struct sock * ssk)50076a13b31SGeliang Tang static inline bool tcp_can_send_ack(const struct sock *ssk)
501fd897679SPaolo Abeni {
502fd897679SPaolo Abeni return !((1 << inet_sk_state_load(ssk)) &
50320bc80b6SPaolo Abeni (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_TIME_WAIT | TCPF_CLOSE | TCPF_LISTEN));
504fd897679SPaolo Abeni }
505fd897679SPaolo Abeni
__mptcp_subflow_send_ack(struct sock * ssk)506a6574302SMat Martineau void __mptcp_subflow_send_ack(struct sock *ssk)
507a6574302SMat Martineau {
508a6574302SMat Martineau if (tcp_can_send_ack(ssk))
509a6574302SMat Martineau tcp_send_ack(ssk);
510a6574302SMat Martineau }
511a6574302SMat Martineau
mptcp_subflow_send_ack(struct sock * ssk)512f5360e9bSPaolo Abeni static void mptcp_subflow_send_ack(struct sock *ssk)
5137ed90803SPaolo Abeni {
51475e908c3SPaolo Abeni bool slow;
5157ed90803SPaolo Abeni
51675e908c3SPaolo Abeni slow = lock_sock_fast(ssk);
517a6574302SMat Martineau __mptcp_subflow_send_ack(ssk);
51875e908c3SPaolo Abeni unlock_sock_fast(ssk, slow);
519fd897679SPaolo Abeni }
520340fa666SMat Martineau
mptcp_send_ack(struct mptcp_sock * msk)521340fa666SMat Martineau static void mptcp_send_ack(struct mptcp_sock *msk)
522340fa666SMat Martineau {
523340fa666SMat Martineau struct mptcp_subflow_context *subflow;
524340fa666SMat Martineau
525340fa666SMat Martineau mptcp_for_each_subflow(msk, subflow)
526340fa666SMat Martineau mptcp_subflow_send_ack(mptcp_subflow_tcp_sock(subflow));
527ea4ca586SPaolo Abeni }
528ea4ca586SPaolo Abeni
mptcp_subflow_cleanup_rbuf(struct sock * ssk)529fde56eeaSPaolo Abeni static void mptcp_subflow_cleanup_rbuf(struct sock *ssk)
530fd897679SPaolo Abeni {
53175e908c3SPaolo Abeni bool slow;
532fd897679SPaolo Abeni
53375e908c3SPaolo Abeni slow = lock_sock_fast(ssk);
534fde56eeaSPaolo Abeni if (tcp_can_send_ack(ssk))
535fd897679SPaolo Abeni tcp_cleanup_rbuf(ssk, 1);
53675e908c3SPaolo Abeni unlock_sock_fast(ssk, slow);
537fde56eeaSPaolo Abeni }
538fde56eeaSPaolo Abeni
mptcp_subflow_could_cleanup(const struct sock * ssk,bool rx_empty)539fde56eeaSPaolo Abeni static bool mptcp_subflow_could_cleanup(const struct sock *ssk, bool rx_empty)
540fde56eeaSPaolo Abeni {
541fde56eeaSPaolo Abeni const struct inet_connection_sock *icsk = inet_csk(ssk);
542c4512c63SMatthieu Baerts u8 ack_pending = READ_ONCE(icsk->icsk_ack.pending);
543fde56eeaSPaolo Abeni const struct tcp_sock *tp = tcp_sk(ssk);
544fde56eeaSPaolo Abeni
545fde56eeaSPaolo Abeni return (ack_pending & ICSK_ACK_SCHED) &&
546fde56eeaSPaolo Abeni ((READ_ONCE(tp->rcv_nxt) - READ_ONCE(tp->rcv_wup) >
547fde56eeaSPaolo Abeni READ_ONCE(icsk->icsk_ack.rcv_mss)) ||
548fde56eeaSPaolo Abeni (rx_empty && ack_pending &
549fde56eeaSPaolo Abeni (ICSK_ACK_PUSHED2 | ICSK_ACK_PUSHED)));
550ea4ca586SPaolo Abeni }
551fd897679SPaolo Abeni
mptcp_cleanup_rbuf(struct mptcp_sock * msk)552fd897679SPaolo Abeni static void mptcp_cleanup_rbuf(struct mptcp_sock *msk)
553fd897679SPaolo Abeni {
554e3859603SPaolo Abeni int old_space = READ_ONCE(msk->old_wspace);
555fd897679SPaolo Abeni struct mptcp_subflow_context *subflow;
556e3859603SPaolo Abeni struct sock *sk = (struct sock *)msk;
557fde56eeaSPaolo Abeni int space = __mptcp_space(sk);
558fde56eeaSPaolo Abeni bool cleanup, rx_empty;
559e3859603SPaolo Abeni
560fde56eeaSPaolo Abeni cleanup = (space > 0) && (space >= (old_space << 1));
561ce599c51SPaolo Abeni rx_empty = !__mptcp_rmem(sk);
562fd897679SPaolo Abeni
563fd897679SPaolo Abeni mptcp_for_each_subflow(msk, subflow) {
564fd897679SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
565fd897679SPaolo Abeni
566fde56eeaSPaolo Abeni if (cleanup || mptcp_subflow_could_cleanup(ssk, rx_empty))
567fde56eeaSPaolo Abeni mptcp_subflow_cleanup_rbuf(ssk);
5687ed90803SPaolo Abeni }
5697ed90803SPaolo Abeni }
5707ed90803SPaolo Abeni
mptcp_check_data_fin(struct sock * sk)5717ed90803SPaolo Abeni static bool mptcp_check_data_fin(struct sock *sk)
5723721b9b6SMat Martineau {
5733721b9b6SMat Martineau struct mptcp_sock *msk = mptcp_sk(sk);
5743721b9b6SMat Martineau u64 rcv_data_fin_seq;
5757ed90803SPaolo Abeni bool ret = false;
5763721b9b6SMat Martineau
5773721b9b6SMat Martineau /* Need to ack a DATA_FIN received from a peer while this side
5783721b9b6SMat Martineau * of the connection is in ESTABLISHED, FIN_WAIT1, or FIN_WAIT2.
5793721b9b6SMat Martineau * msk->rcv_data_fin was set when parsing the incoming options
5803721b9b6SMat Martineau * at the subflow level and the msk lock was not held, so this
5813721b9b6SMat Martineau * is the first opportunity to act on the DATA_FIN and change
5823721b9b6SMat Martineau * the msk state.
5833721b9b6SMat Martineau *
5843721b9b6SMat Martineau * If we are caught up to the sequence number of the incoming
5853721b9b6SMat Martineau * DATA_FIN, send the DATA_ACK now and do state transition. If
5863721b9b6SMat Martineau * not caught up, do nothing and let the recv code send DATA_ACK
5873721b9b6SMat Martineau * when catching up.
5883721b9b6SMat Martineau */
5893721b9b6SMat Martineau
5903721b9b6SMat Martineau if (mptcp_pending_data_fin(sk, &rcv_data_fin_seq)) {
591917944daSMat Martineau WRITE_ONCE(msk->ack_seq, msk->ack_seq + 1);
5923721b9b6SMat Martineau WRITE_ONCE(msk->rcv_data_fin, 0);
5933721b9b6SMat Martineau
5946b9831bfSPaolo Abeni WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | RCV_SHUTDOWN);
59516a9a9daSMat Martineau smp_mb__before_atomic(); /* SHUTDOWN must be visible first */
5963721b9b6SMat Martineau
5973721b9b6SMat Martineau switch (sk->sk_state) {
5983721b9b6SMat Martineau case TCP_ESTABLISHED:
599d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE_WAIT);
6003721b9b6SMat Martineau break;
6013721b9b6SMat Martineau case TCP_FIN_WAIT1:
602d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSING);
6033721b9b6SMat Martineau break;
6043721b9b6SMat Martineau case TCP_FIN_WAIT2:
605d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
6063721b9b6SMat Martineau break;
6073721b9b6SMat Martineau default:
6083721b9b6SMat Martineau /* Other states not expected */
6093721b9b6SMat Martineau WARN_ON_ONCE(1);
6103721b9b6SMat Martineau break;
6113721b9b6SMat Martineau }
6123721b9b6SMat Martineau
6137ed90803SPaolo Abeni ret = true;
61481c1d029SPaolo Abeni if (!__mptcp_check_fallback(msk))
615fd897679SPaolo Abeni mptcp_send_ack(msk);
616e16163b6SPaolo Abeni mptcp_close_wake_up(sk);
6173721b9b6SMat Martineau }
6187ed90803SPaolo Abeni return ret;
6193721b9b6SMat Martineau }
6203721b9b6SMat Martineau
__mptcp_move_skbs_from_subflow(struct mptcp_sock * msk,struct sock * ssk,unsigned int * bytes)6216771bfd9SFlorian Westphal static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
6226771bfd9SFlorian Westphal struct sock *ssk,
6236771bfd9SFlorian Westphal unsigned int *bytes)
6246771bfd9SFlorian Westphal {
6256771bfd9SFlorian Westphal struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
626600911ffSFlorian Westphal struct sock *sk = (struct sock *)msk;
6276771bfd9SFlorian Westphal unsigned int moved = 0;
6286771bfd9SFlorian Westphal bool more_data_avail;
6296771bfd9SFlorian Westphal struct tcp_sock *tp;
6306771bfd9SFlorian Westphal bool done = false;
63113c7ba0cSFlorian Westphal int sk_rbuf;
63213c7ba0cSFlorian Westphal
63313c7ba0cSFlorian Westphal sk_rbuf = READ_ONCE(sk->sk_rcvbuf);
63413c7ba0cSFlorian Westphal
63513c7ba0cSFlorian Westphal if (!(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) {
63613c7ba0cSFlorian Westphal int ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf);
63713c7ba0cSFlorian Westphal
63813c7ba0cSFlorian Westphal if (unlikely(ssk_rbuf > sk_rbuf)) {
63913c7ba0cSFlorian Westphal WRITE_ONCE(sk->sk_rcvbuf, ssk_rbuf);
64013c7ba0cSFlorian Westphal sk_rbuf = ssk_rbuf;
64113c7ba0cSFlorian Westphal }
64213c7ba0cSFlorian Westphal }
643600911ffSFlorian Westphal
644ab174ad8SPaolo Abeni pr_debug("msk=%p ssk=%p", msk, ssk);
6456771bfd9SFlorian Westphal tp = tcp_sk(ssk);
6466771bfd9SFlorian Westphal do {
6476771bfd9SFlorian Westphal u32 map_remaining, offset;
6486771bfd9SFlorian Westphal u32 seq = tp->copied_seq;
6496771bfd9SFlorian Westphal struct sk_buff *skb;
6506771bfd9SFlorian Westphal bool fin;
6516771bfd9SFlorian Westphal
6526771bfd9SFlorian Westphal /* try to move as much data as available */
6536771bfd9SFlorian Westphal map_remaining = subflow->map_data_len -
6546771bfd9SFlorian Westphal mptcp_subflow_get_map_offset(subflow);
6556771bfd9SFlorian Westphal
6566771bfd9SFlorian Westphal skb = skb_peek(&ssk->sk_receive_queue);
657d9fb8c50SPaolo Abeni if (!skb) {
658d89e3ed7SPaolo Abeni /* With racing move_skbs_to_msk() and __mptcp_move_skbs(),
659d89e3ed7SPaolo Abeni * a different CPU can have already processed the pending
660d89e3ed7SPaolo Abeni * data, stop here or we can enter an infinite loop
661d9fb8c50SPaolo Abeni */
662d9fb8c50SPaolo Abeni if (!moved)
663d9fb8c50SPaolo Abeni done = true;
6646771bfd9SFlorian Westphal break;
665d9fb8c50SPaolo Abeni }
6666771bfd9SFlorian Westphal
667e1ff9e82SDavide Caratti if (__mptcp_check_fallback(msk)) {
668d89e3ed7SPaolo Abeni /* Under fallback skbs have no MPTCP extension and TCP could
669d89e3ed7SPaolo Abeni * collapse them between the dummy map creation and the
670d89e3ed7SPaolo Abeni * current dequeue. Be sure to adjust the map size.
671e1ff9e82SDavide Caratti */
672e1ff9e82SDavide Caratti map_remaining = skb->len;
673e1ff9e82SDavide Caratti subflow->map_data_len = skb->len;
674e1ff9e82SDavide Caratti }
675e1ff9e82SDavide Caratti
6766771bfd9SFlorian Westphal offset = seq - TCP_SKB_CB(skb)->seq;
6776771bfd9SFlorian Westphal fin = TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN;
6786771bfd9SFlorian Westphal if (fin) {
6796771bfd9SFlorian Westphal done = true;
6806771bfd9SFlorian Westphal seq++;
6816771bfd9SFlorian Westphal }
6826771bfd9SFlorian Westphal
6836771bfd9SFlorian Westphal if (offset < skb->len) {
6846771bfd9SFlorian Westphal size_t len = skb->len - offset;
6856771bfd9SFlorian Westphal
6866771bfd9SFlorian Westphal if (tp->urg_data)
6876771bfd9SFlorian Westphal done = true;
6886771bfd9SFlorian Westphal
689ab174ad8SPaolo Abeni if (__mptcp_move_skb(msk, ssk, skb, offset, len))
6906771bfd9SFlorian Westphal moved += len;
691ab174ad8SPaolo Abeni seq += len;
6926771bfd9SFlorian Westphal
6936771bfd9SFlorian Westphal if (WARN_ON_ONCE(map_remaining < len))
6946771bfd9SFlorian Westphal break;
6956771bfd9SFlorian Westphal } else {
6966771bfd9SFlorian Westphal WARN_ON_ONCE(!fin);
6976771bfd9SFlorian Westphal sk_eat_skb(ssk, skb);
6986771bfd9SFlorian Westphal done = true;
6996771bfd9SFlorian Westphal }
7006771bfd9SFlorian Westphal
7016771bfd9SFlorian Westphal WRITE_ONCE(tp->copied_seq, seq);
7026771bfd9SFlorian Westphal more_data_avail = mptcp_subflow_data_available(ssk);
703600911ffSFlorian Westphal
70413c7ba0cSFlorian Westphal if (atomic_read(&sk->sk_rmem_alloc) > sk_rbuf) {
705600911ffSFlorian Westphal done = true;
706600911ffSFlorian Westphal break;
707600911ffSFlorian Westphal }
7086771bfd9SFlorian Westphal } while (more_data_avail);
7096771bfd9SFlorian Westphal
7106719331cSPaolo Abeni *bytes += moved;
7116771bfd9SFlorian Westphal return done;
7126771bfd9SFlorian Westphal }
7136771bfd9SFlorian Westphal
__mptcp_ofo_queue(struct mptcp_sock * msk)71487952603SPaolo Abeni static bool __mptcp_ofo_queue(struct mptcp_sock *msk)
715ab174ad8SPaolo Abeni {
716ab174ad8SPaolo Abeni struct sock *sk = (struct sock *)msk;
717ab174ad8SPaolo Abeni struct sk_buff *skb, *tail;
718ab174ad8SPaolo Abeni bool moved = false;
719ab174ad8SPaolo Abeni struct rb_node *p;
720ab174ad8SPaolo Abeni u64 end_seq;
721ab174ad8SPaolo Abeni
722ab174ad8SPaolo Abeni p = rb_first(&msk->out_of_order_queue);
72306242e44SPaolo Abeni pr_debug("msk=%p empty=%d", msk, RB_EMPTY_ROOT(&msk->out_of_order_queue));
724ab174ad8SPaolo Abeni while (p) {
725ab174ad8SPaolo Abeni skb = rb_to_skb(p);
726ab174ad8SPaolo Abeni if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq))
727ab174ad8SPaolo Abeni break;
728ab174ad8SPaolo Abeni
729ab174ad8SPaolo Abeni p = rb_next(p);
730ab174ad8SPaolo Abeni rb_erase(&skb->rbnode, &msk->out_of_order_queue);
731ab174ad8SPaolo Abeni
732ab174ad8SPaolo Abeni if (unlikely(!after64(MPTCP_SKB_CB(skb)->end_seq,
733ab174ad8SPaolo Abeni msk->ack_seq))) {
734ab174ad8SPaolo Abeni mptcp_drop(sk, skb);
73506242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA);
736ab174ad8SPaolo Abeni continue;
737ab174ad8SPaolo Abeni }
738ab174ad8SPaolo Abeni
739ab174ad8SPaolo Abeni end_seq = MPTCP_SKB_CB(skb)->end_seq;
740ab174ad8SPaolo Abeni tail = skb_peek_tail(&sk->sk_receive_queue);
741ab174ad8SPaolo Abeni if (!tail || !mptcp_ooo_try_coalesce(msk, tail, skb)) {
742ab174ad8SPaolo Abeni int delta = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq;
743ab174ad8SPaolo Abeni
744ab174ad8SPaolo Abeni /* skip overlapping data, if any */
74506242e44SPaolo Abeni pr_debug("uncoalesced seq=%llx ack seq=%llx delta=%d",
74606242e44SPaolo Abeni MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq,
74706242e44SPaolo Abeni delta);
748ab174ad8SPaolo Abeni MPTCP_SKB_CB(skb)->offset += delta;
7492c9e7765SFlorian Westphal MPTCP_SKB_CB(skb)->map_seq += delta;
750ab174ad8SPaolo Abeni __skb_queue_tail(&sk->sk_receive_queue, skb);
751ab174ad8SPaolo Abeni }
75238967f42SPaolo Abeni msk->bytes_received += end_seq - msk->ack_seq;
753ab174ad8SPaolo Abeni msk->ack_seq = end_seq;
754ab174ad8SPaolo Abeni moved = true;
755ab174ad8SPaolo Abeni }
756ab174ad8SPaolo Abeni return moved;
757ab174ad8SPaolo Abeni }
758ab174ad8SPaolo Abeni
__mptcp_subflow_error_report(struct sock * sk,struct sock * ssk)7599f1a9881SPaolo Abeni static bool __mptcp_subflow_error_report(struct sock *sk, struct sock *ssk)
760d5fbeff1SPaolo Abeni {
761d5fbeff1SPaolo Abeni int err = sock_error(ssk);
762d5fbeff1SPaolo Abeni int ssk_state;
763d5fbeff1SPaolo Abeni
764d5fbeff1SPaolo Abeni if (!err)
7659f1a9881SPaolo Abeni return false;
766d5fbeff1SPaolo Abeni
767d5fbeff1SPaolo Abeni /* only propagate errors on fallen-back sockets or
768d5fbeff1SPaolo Abeni * on MPC connect
769d5fbeff1SPaolo Abeni */
7709f1a9881SPaolo Abeni if (sk->sk_state != TCP_SYN_SENT && !__mptcp_check_fallback(mptcp_sk(sk)))
7719f1a9881SPaolo Abeni return false;
772d5fbeff1SPaolo Abeni
773d5fbeff1SPaolo Abeni /* We need to propagate only transition to CLOSE state.
774d5fbeff1SPaolo Abeni * Orphaned socket will see such state change via
775d5fbeff1SPaolo Abeni * subflow_sched_work_if_closed() and that path will properly
776d5fbeff1SPaolo Abeni * destroy the msk as needed.
777d5fbeff1SPaolo Abeni */
778d5fbeff1SPaolo Abeni ssk_state = inet_sk_state_load(ssk);
779d5fbeff1SPaolo Abeni if (ssk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DEAD))
780d52b3c2bSGeliang Tang mptcp_set_state(sk, ssk_state);
781d5fbeff1SPaolo Abeni WRITE_ONCE(sk->sk_err, -err);
782d5fbeff1SPaolo Abeni
783d5fbeff1SPaolo Abeni /* This barrier is coupled with smp_rmb() in mptcp_poll() */
784d5fbeff1SPaolo Abeni smp_wmb();
785d5fbeff1SPaolo Abeni sk_error_report(sk);
7869f1a9881SPaolo Abeni return true;
787d5fbeff1SPaolo Abeni }
7889f1a9881SPaolo Abeni
__mptcp_error_report(struct sock * sk)7899f1a9881SPaolo Abeni void __mptcp_error_report(struct sock *sk)
7909f1a9881SPaolo Abeni {
7919f1a9881SPaolo Abeni struct mptcp_subflow_context *subflow;
7929f1a9881SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
7939f1a9881SPaolo Abeni
7949f1a9881SPaolo Abeni mptcp_for_each_subflow(msk, subflow)
7959f1a9881SPaolo Abeni if (__mptcp_subflow_error_report(sk, mptcp_subflow_tcp_sock(subflow)))
7969f1a9881SPaolo Abeni break;
797d5fbeff1SPaolo Abeni }
798d5fbeff1SPaolo Abeni
7992e52213cSFlorian Westphal /* In most cases we will be able to lock the mptcp socket. If its already
8002e52213cSFlorian Westphal * owned, we need to defer to the work queue to avoid ABBA deadlock.
8012e52213cSFlorian Westphal */
move_skbs_to_msk(struct mptcp_sock * msk,struct sock * ssk)80299d1055cSPaolo Abeni static bool move_skbs_to_msk(struct mptcp_sock *msk, struct sock *ssk)
8032e52213cSFlorian Westphal {
8042e52213cSFlorian Westphal struct sock *sk = (struct sock *)msk;
8052e52213cSFlorian Westphal unsigned int moved = 0;
8062e52213cSFlorian Westphal
8072e52213cSFlorian Westphal __mptcp_move_skbs_from_subflow(msk, ssk, &moved);
80887952603SPaolo Abeni __mptcp_ofo_queue(msk);
809499ada50SPaolo Abeni if (unlikely(ssk->sk_err)) {
810499ada50SPaolo Abeni if (!sock_owned_by_user(sk))
811499ada50SPaolo Abeni __mptcp_error_report(sk);
812499ada50SPaolo Abeni else
813e9d09bacSPaolo Abeni __set_bit(MPTCP_ERROR_REPORT, &msk->cb_flags);
814499ada50SPaolo Abeni }
815ab174ad8SPaolo Abeni
816ab174ad8SPaolo Abeni /* If the moves have caught up with the DATA_FIN sequence number
817ab174ad8SPaolo Abeni * it's time to ack the DATA_FIN and change socket state, but
818ab174ad8SPaolo Abeni * this is not a good place to change state. Let the workqueue
819ab174ad8SPaolo Abeni * do it.
820ab174ad8SPaolo Abeni */
821ba8f48f7SPaolo Abeni if (mptcp_pending_data_fin(sk, NULL))
822ba8f48f7SPaolo Abeni mptcp_schedule_work(sk);
82399d1055cSPaolo Abeni return moved > 0;
8242e52213cSFlorian Westphal }
8252e52213cSFlorian Westphal
mptcp_data_ready(struct sock * sk,struct sock * ssk)8262e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk)
827101f6f85SFlorian Westphal {
8286719331cSPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
829101f6f85SFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk);
83013c7ba0cSFlorian Westphal int sk_rbuf, ssk_rbuf;
831101f6f85SFlorian Westphal
832d7b1bfd0SPaolo Abeni /* The peer can send data while we are shutting down this
833d7b1bfd0SPaolo Abeni * subflow at msk destruction time, but we must avoid enqueuing
834d7b1bfd0SPaolo Abeni * more data to the msk receive queue
835d7b1bfd0SPaolo Abeni */
836d7b1bfd0SPaolo Abeni if (unlikely(subflow->disposable))
837d7b1bfd0SPaolo Abeni return;
838d7b1bfd0SPaolo Abeni
83913c7ba0cSFlorian Westphal ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf);
84013c7ba0cSFlorian Westphal sk_rbuf = READ_ONCE(sk->sk_rcvbuf);
84113c7ba0cSFlorian Westphal if (unlikely(ssk_rbuf > sk_rbuf))
84213c7ba0cSFlorian Westphal sk_rbuf = ssk_rbuf;
84313c7ba0cSFlorian Westphal
84499d1055cSPaolo Abeni /* over limit? can't append more skbs to msk, Also, no need to wake-up*/
845ce599c51SPaolo Abeni if (__mptcp_rmem(sk) > sk_rbuf) {
846ce599c51SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RCVPRUNED);
84799d1055cSPaolo Abeni return;
848ce599c51SPaolo Abeni }
8492e52213cSFlorian Westphal
85099d1055cSPaolo Abeni /* Wake-up the reader only for in-sequence data */
85199d1055cSPaolo Abeni mptcp_data_lock(sk);
852612f71d7SPaolo Abeni if (move_skbs_to_msk(msk, ssk))
853101f6f85SFlorian Westphal sk->sk_data_ready(sk);
854612f71d7SPaolo Abeni
85599d1055cSPaolo Abeni mptcp_data_unlock(sk);
85699d1055cSPaolo Abeni }
857101f6f85SFlorian Westphal
mptcp_subflow_joined(struct mptcp_sock * msk,struct sock * ssk)85855b47ca7SPaolo Abeni static void mptcp_subflow_joined(struct mptcp_sock *msk, struct sock *ssk)
85955b47ca7SPaolo Abeni {
86055b47ca7SPaolo Abeni mptcp_subflow_ctx(ssk)->map_seq = READ_ONCE(msk->ack_seq);
86155b47ca7SPaolo Abeni WRITE_ONCE(msk->allow_infinite_fallback, false);
86255b47ca7SPaolo Abeni mptcp_event(MPTCP_EVENT_SUB_ESTABLISHED, msk, ssk, GFP_ATOMIC);
86355b47ca7SPaolo Abeni }
86455b47ca7SPaolo Abeni
__mptcp_finish_join(struct mptcp_sock * msk,struct sock * ssk)8653e501490SPaolo Abeni static bool __mptcp_finish_join(struct mptcp_sock *msk, struct sock *ssk)
866ec3edaa7SPeter Krystad {
8673e501490SPaolo Abeni struct sock *sk = (struct sock *)msk;
8685cf92bbaSPaolo Abeni
8693e501490SPaolo Abeni if (sk->sk_state != TCP_ESTABLISHED)
87078962489SFlorian Westphal return false;
871ec3edaa7SPeter Krystad
8723e501490SPaolo Abeni /* attach to msk socket only after we are sure we will deal with it
8733e501490SPaolo Abeni * at close time
8743e501490SPaolo Abeni */
8753e501490SPaolo Abeni if (sk->sk_socket && !ssk->sk_socket)
8763e501490SPaolo Abeni mptcp_sock_graft(ssk, sk->sk_socket);
87778962489SFlorian Westphal
8786f06b4d4SPaolo Abeni mptcp_subflow_ctx(ssk)->subflow_id = msk->subflow_id++;
8793e501490SPaolo Abeni mptcp_sockopt_sync_locked(msk, ssk);
88055b47ca7SPaolo Abeni mptcp_subflow_joined(msk, ssk);
88127e5ccc2SPaolo Abeni mptcp_stop_tout_timer(sk);
88234c7757aSPaolo Abeni __mptcp_propagate_sndbuf(sk, ssk);
8833e501490SPaolo Abeni return true;
88478962489SFlorian Westphal }
88578962489SFlorian Westphal
__mptcp_flush_join_list(struct sock * sk,struct list_head * join_list)88656a666c4SPaolo Abeni static void __mptcp_flush_join_list(struct sock *sk, struct list_head *join_list)
88778962489SFlorian Westphal {
8883e501490SPaolo Abeni struct mptcp_subflow_context *tmp, *subflow;
8893e501490SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
89078962489SFlorian Westphal
89156a666c4SPaolo Abeni list_for_each_entry_safe(subflow, tmp, join_list, node) {
8923e501490SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
8933e501490SPaolo Abeni bool slow = lock_sock_fast(ssk);
8943e501490SPaolo Abeni
8953e501490SPaolo Abeni list_move_tail(&subflow->node, &msk->conn_list);
8963e501490SPaolo Abeni if (!__mptcp_finish_join(msk, ssk))
8973e501490SPaolo Abeni mptcp_subflow_reset(ssk);
8983e501490SPaolo Abeni unlock_sock_fast(ssk, slow);
89978962489SFlorian Westphal }
900ec3edaa7SPeter Krystad }
901ec3edaa7SPeter Krystad
mptcp_rtx_timer_pending(struct sock * sk)902f6909dc1SPaolo Abeni static bool mptcp_rtx_timer_pending(struct sock *sk)
903b51f9b80SPaolo Abeni {
904b51f9b80SPaolo Abeni return timer_pending(&inet_csk(sk)->icsk_retransmit_timer);
905b51f9b80SPaolo Abeni }
906b51f9b80SPaolo Abeni
mptcp_reset_rtx_timer(struct sock * sk)907f6909dc1SPaolo Abeni static void mptcp_reset_rtx_timer(struct sock *sk)
908b51f9b80SPaolo Abeni {
909b51f9b80SPaolo Abeni struct inet_connection_sock *icsk = inet_csk(sk);
910b51f9b80SPaolo Abeni unsigned long tout;
911b51f9b80SPaolo Abeni
912e16163b6SPaolo Abeni /* prevent rescheduling on close */
913e16163b6SPaolo Abeni if (unlikely(inet_sk_state_load(sk) == TCP_CLOSE))
914e16163b6SPaolo Abeni return;
915e16163b6SPaolo Abeni
91633d41c9cSPaolo Abeni tout = mptcp_sk(sk)->timer_ival;
917b51f9b80SPaolo Abeni sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + tout);
918b51f9b80SPaolo Abeni }
919b51f9b80SPaolo Abeni
mptcp_schedule_work(struct sock * sk)920ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk)
921ba8f48f7SPaolo Abeni {
922ba8f48f7SPaolo Abeni if (inet_sk_state_load(sk) != TCP_CLOSE &&
923ba8f48f7SPaolo Abeni schedule_work(&mptcp_sk(sk)->work)) {
924ba8f48f7SPaolo Abeni /* each subflow already holds a reference to the sk, and the
925ba8f48f7SPaolo Abeni * workqueue is invoked by a subflow, so sk can't go away here.
926ba8f48f7SPaolo Abeni */
927ba8f48f7SPaolo Abeni sock_hold(sk);
928ba8f48f7SPaolo Abeni return true;
929ba8f48f7SPaolo Abeni }
930ba8f48f7SPaolo Abeni return false;
931ba8f48f7SPaolo Abeni }
932ba8f48f7SPaolo Abeni
mptcp_subflow_recv_lookup(const struct mptcp_sock * msk)9337a6a6cbcSPaolo Abeni static struct sock *mptcp_subflow_recv_lookup(const struct mptcp_sock *msk)
9347a6a6cbcSPaolo Abeni {
9357a6a6cbcSPaolo Abeni struct mptcp_subflow_context *subflow;
9367a6a6cbcSPaolo Abeni
937109cdeb8SGeliang Tang msk_owned_by_me(msk);
9387a6a6cbcSPaolo Abeni
9397a6a6cbcSPaolo Abeni mptcp_for_each_subflow(msk, subflow) {
94099d1055cSPaolo Abeni if (READ_ONCE(subflow->data_avail))
9417a6a6cbcSPaolo Abeni return mptcp_subflow_tcp_sock(subflow);
9427a6a6cbcSPaolo Abeni }
9437a6a6cbcSPaolo Abeni
9447a6a6cbcSPaolo Abeni return NULL;
9457a6a6cbcSPaolo Abeni }
9467a6a6cbcSPaolo Abeni
mptcp_skb_can_collapse_to(u64 write_seq,const struct sk_buff * skb,const struct mptcp_ext * mpext)9473f8e0aaeSPaolo Abeni static bool mptcp_skb_can_collapse_to(u64 write_seq,
94857040755SPaolo Abeni const struct sk_buff *skb,
94957040755SPaolo Abeni const struct mptcp_ext *mpext)
9506d0060f6SMat Martineau {
95157040755SPaolo Abeni if (!tcp_skb_can_collapse_to(skb))
95257040755SPaolo Abeni return false;
95357040755SPaolo Abeni
9545a369ca6SPaolo Abeni /* can collapse only if MPTCP level sequence is in order and this
9555a369ca6SPaolo Abeni * mapping has not been xmitted yet
9565a369ca6SPaolo Abeni */
9575a369ca6SPaolo Abeni return mpext && mpext->data_seq + mpext->data_len == write_seq &&
9585a369ca6SPaolo Abeni !mpext->frozen;
95957040755SPaolo Abeni }
96057040755SPaolo Abeni
96129249eacSPaolo Abeni /* we can append data to the given data frag if:
96229249eacSPaolo Abeni * - there is space available in the backing page_frag
96329249eacSPaolo Abeni * - the data frag tail matches the current page_frag free offset
96429249eacSPaolo Abeni * - the data frag end sequence number matches the current write seq
96529249eacSPaolo Abeni */
mptcp_frag_can_collapse_to(const struct mptcp_sock * msk,const struct page_frag * pfrag,const struct mptcp_data_frag * df)96618b683bfSPaolo Abeni static bool mptcp_frag_can_collapse_to(const struct mptcp_sock *msk,
96718b683bfSPaolo Abeni const struct page_frag *pfrag,
96818b683bfSPaolo Abeni const struct mptcp_data_frag *df)
96918b683bfSPaolo Abeni {
97018b683bfSPaolo Abeni return df && pfrag->page == df->page &&
971d9ca1de8SPaolo Abeni pfrag->size - pfrag->offset > 0 &&
97229249eacSPaolo Abeni pfrag->offset == (df->offset + df->data_len) &&
97318b683bfSPaolo Abeni df->data_seq + df->data_len == msk->write_seq;
97418b683bfSPaolo Abeni }
97518b683bfSPaolo Abeni
dfrag_uncharge(struct sock * sk,int len)976d027236cSPaolo Abeni static void dfrag_uncharge(struct sock *sk, int len)
97718b683bfSPaolo Abeni {
978d027236cSPaolo Abeni sk_mem_uncharge(sk, len);
9797948f6ccSFlorian Westphal sk_wmem_queued_add(sk, -len);
980d027236cSPaolo Abeni }
981d027236cSPaolo Abeni
dfrag_clear(struct sock * sk,struct mptcp_data_frag * dfrag)982d027236cSPaolo Abeni static void dfrag_clear(struct sock *sk, struct mptcp_data_frag *dfrag)
983d027236cSPaolo Abeni {
984d027236cSPaolo Abeni int len = dfrag->data_len + dfrag->overhead;
985d027236cSPaolo Abeni
98618b683bfSPaolo Abeni list_del(&dfrag->list);
987d027236cSPaolo Abeni dfrag_uncharge(sk, len);
98818b683bfSPaolo Abeni put_page(dfrag->page);
98918b683bfSPaolo Abeni }
99018b683bfSPaolo Abeni
__mptcp_clean_una(struct sock * sk)9916e628cd3SPaolo Abeni static void __mptcp_clean_una(struct sock *sk)
99218b683bfSPaolo Abeni {
99318b683bfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
99418b683bfSPaolo Abeni struct mptcp_data_frag *dtmp, *dfrag;
995e1ff9e82SDavide Caratti u64 snd_una;
996e1ff9e82SDavide Caratti
9977439d687SPaolo Abeni snd_una = msk->snd_una;
99818b683bfSPaolo Abeni list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) {
99918b683bfSPaolo Abeni if (after64(dfrag->data_seq + dfrag->data_len, snd_una))
100018b683bfSPaolo Abeni break;
100118b683bfSPaolo Abeni
10021e1d9d6fSPaolo Abeni if (unlikely(dfrag == msk->first_pending)) {
10031e1d9d6fSPaolo Abeni /* in recovery mode can see ack after the current snd head */
10041e1d9d6fSPaolo Abeni if (WARN_ON_ONCE(!msk->recovery))
1005d9ca1de8SPaolo Abeni break;
10061e1d9d6fSPaolo Abeni
10071e1d9d6fSPaolo Abeni WRITE_ONCE(msk->first_pending, mptcp_send_next(sk));
10081e1d9d6fSPaolo Abeni }
10091e1d9d6fSPaolo Abeni
1010d027236cSPaolo Abeni dfrag_clear(sk, dfrag);
1011d027236cSPaolo Abeni }
1012d027236cSPaolo Abeni
10137948f6ccSFlorian Westphal dfrag = mptcp_rtx_head(sk);
10147948f6ccSFlorian Westphal if (dfrag && after64(snd_una, dfrag->data_seq)) {
101553eb4c38SPaolo Abeni u64 delta = snd_una - dfrag->data_seq;
101653eb4c38SPaolo Abeni
10171e1d9d6fSPaolo Abeni /* prevent wrap around in recovery mode */
10181e1d9d6fSPaolo Abeni if (unlikely(delta > dfrag->already_sent)) {
10191e1d9d6fSPaolo Abeni if (WARN_ON_ONCE(!msk->recovery))
102053eb4c38SPaolo Abeni goto out;
10211e1d9d6fSPaolo Abeni if (WARN_ON_ONCE(delta > dfrag->data_len))
10221e1d9d6fSPaolo Abeni goto out;
10231e1d9d6fSPaolo Abeni dfrag->already_sent += delta - dfrag->already_sent;
10241e1d9d6fSPaolo Abeni }
10257948f6ccSFlorian Westphal
10267948f6ccSFlorian Westphal dfrag->data_seq += delta;
102753eb4c38SPaolo Abeni dfrag->offset += delta;
10287948f6ccSFlorian Westphal dfrag->data_len -= delta;
1029d9ca1de8SPaolo Abeni dfrag->already_sent -= delta;
10307948f6ccSFlorian Westphal
10317948f6ccSFlorian Westphal dfrag_uncharge(sk, delta);
10327948f6ccSFlorian Westphal }
10337948f6ccSFlorian Westphal
10341e1d9d6fSPaolo Abeni /* all retransmitted data acked, recovery completed */
10351e1d9d6fSPaolo Abeni if (unlikely(msk->recovery) && after64(msk->snd_una, msk->recovery_snd_nxt))
10361e1d9d6fSPaolo Abeni msk->recovery = false;
10371e1d9d6fSPaolo Abeni
103853eb4c38SPaolo Abeni out:
10393241a9c0SFlorian Westphal if (snd_una == READ_ONCE(msk->snd_nxt) &&
10403241a9c0SFlorian Westphal snd_una == READ_ONCE(msk->write_seq)) {
1041f6909dc1SPaolo Abeni if (mptcp_rtx_timer_pending(sk) && !mptcp_data_fin_enabled(msk))
1042f6909dc1SPaolo Abeni mptcp_stop_rtx_timer(sk);
10436e628cd3SPaolo Abeni } else {
1044f6909dc1SPaolo Abeni mptcp_reset_rtx_timer(sk);
10456e628cd3SPaolo Abeni }
10466e628cd3SPaolo Abeni }
10476e628cd3SPaolo Abeni
__mptcp_clean_una_wakeup(struct sock * sk)1048417789dfSPaolo Abeni static void __mptcp_clean_una_wakeup(struct sock *sk)
1049417789dfSPaolo Abeni {
1050765ff425SPaolo Abeni lockdep_assert_held_once(&sk->sk_lock.slock);
1051765ff425SPaolo Abeni
1052417789dfSPaolo Abeni __mptcp_clean_una(sk);
1053417789dfSPaolo Abeni mptcp_write_space(sk);
1054417789dfSPaolo Abeni }
1055417789dfSPaolo Abeni
mptcp_clean_una_wakeup(struct sock * sk)1056b5941f06SPaolo Abeni static void mptcp_clean_una_wakeup(struct sock *sk)
1057b5941f06SPaolo Abeni {
1058b5941f06SPaolo Abeni mptcp_data_lock(sk);
1059b5941f06SPaolo Abeni __mptcp_clean_una_wakeup(sk);
1060b5941f06SPaolo Abeni mptcp_data_unlock(sk);
1061b5941f06SPaolo Abeni }
1062b5941f06SPaolo Abeni
mptcp_enter_memory_pressure(struct sock * sk)1063724cfd2eSPaolo Abeni static void mptcp_enter_memory_pressure(struct sock *sk)
106418b683bfSPaolo Abeni {
1065d9ca1de8SPaolo Abeni struct mptcp_subflow_context *subflow;
1066d9ca1de8SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
1067d9ca1de8SPaolo Abeni bool first = true;
1068d9ca1de8SPaolo Abeni
1069d9ca1de8SPaolo Abeni mptcp_for_each_subflow(msk, subflow) {
1070d9ca1de8SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
1071d9ca1de8SPaolo Abeni
1072d9ca1de8SPaolo Abeni if (first)
1073d9ca1de8SPaolo Abeni tcp_enter_memory_pressure(ssk);
1074d9ca1de8SPaolo Abeni sk_stream_moderate_sndbuf(ssk);
107534c7757aSPaolo Abeni
1076d9ca1de8SPaolo Abeni first = false;
1077d9ca1de8SPaolo Abeni }
107834c7757aSPaolo Abeni __mptcp_sync_sndbuf(sk);
1079724cfd2eSPaolo Abeni }
1080724cfd2eSPaolo Abeni
1081724cfd2eSPaolo Abeni /* ensure we get enough memory for the frag hdr, beyond some minimal amount of
1082724cfd2eSPaolo Abeni * data
1083724cfd2eSPaolo Abeni */
mptcp_page_frag_refill(struct sock * sk,struct page_frag * pfrag)1084724cfd2eSPaolo Abeni static bool mptcp_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1085724cfd2eSPaolo Abeni {
1086724cfd2eSPaolo Abeni if (likely(skb_page_frag_refill(32U + sizeof(struct mptcp_data_frag),
1087724cfd2eSPaolo Abeni pfrag, sk->sk_allocation)))
1088724cfd2eSPaolo Abeni return true;
1089724cfd2eSPaolo Abeni
1090724cfd2eSPaolo Abeni mptcp_enter_memory_pressure(sk);
109118b683bfSPaolo Abeni return false;
109218b683bfSPaolo Abeni }
109318b683bfSPaolo Abeni
109418b683bfSPaolo Abeni static struct mptcp_data_frag *
mptcp_carve_data_frag(const struct mptcp_sock * msk,struct page_frag * pfrag,int orig_offset)109518b683bfSPaolo Abeni mptcp_carve_data_frag(const struct mptcp_sock *msk, struct page_frag *pfrag,
109618b683bfSPaolo Abeni int orig_offset)
109718b683bfSPaolo Abeni {
109818b683bfSPaolo Abeni int offset = ALIGN(orig_offset, sizeof(long));
109918b683bfSPaolo Abeni struct mptcp_data_frag *dfrag;
110018b683bfSPaolo Abeni
110118b683bfSPaolo Abeni dfrag = (struct mptcp_data_frag *)(page_to_virt(pfrag->page) + offset);
110218b683bfSPaolo Abeni dfrag->data_len = 0;
110318b683bfSPaolo Abeni dfrag->data_seq = msk->write_seq;
110418b683bfSPaolo Abeni dfrag->overhead = offset - orig_offset + sizeof(struct mptcp_data_frag);
110518b683bfSPaolo Abeni dfrag->offset = offset + sizeof(struct mptcp_data_frag);
1106d9ca1de8SPaolo Abeni dfrag->already_sent = 0;
110718b683bfSPaolo Abeni dfrag->page = pfrag->page;
110818b683bfSPaolo Abeni
110918b683bfSPaolo Abeni return dfrag;
111018b683bfSPaolo Abeni }
111118b683bfSPaolo Abeni
1112caf971dfSPaolo Abeni struct mptcp_sendmsg_info {
1113caf971dfSPaolo Abeni int mss_now;
1114caf971dfSPaolo Abeni int size_goal;
1115d9ca1de8SPaolo Abeni u16 limit;
1116d9ca1de8SPaolo Abeni u16 sent;
1117d9ca1de8SPaolo Abeni unsigned int flags;
11181094c6feSPaolo Abeni bool data_lock_held;
1119caf971dfSPaolo Abeni };
1120caf971dfSPaolo Abeni
mptcp_check_allowed_size(const struct mptcp_sock * msk,struct sock * ssk,u64 data_seq,int avail_size)1121b713d006SPaolo Abeni static int mptcp_check_allowed_size(const struct mptcp_sock *msk, struct sock *ssk,
1122b713d006SPaolo Abeni u64 data_seq, int avail_size)
11236f8a612aSFlorian Westphal {
11246f8a612aSFlorian Westphal u64 window_end = mptcp_wnd_end(msk);
1125b713d006SPaolo Abeni u64 mptcp_snd_wnd;
11266f8a612aSFlorian Westphal
11276f8a612aSFlorian Westphal if (__mptcp_check_fallback(msk))
11286f8a612aSFlorian Westphal return avail_size;
11296f8a612aSFlorian Westphal
1130b713d006SPaolo Abeni mptcp_snd_wnd = window_end - data_seq;
1131b713d006SPaolo Abeni avail_size = min_t(unsigned int, mptcp_snd_wnd, avail_size);
11326f8a612aSFlorian Westphal
113392be2f52SPaolo Abeni if (unlikely(tcp_sk(ssk)->snd_wnd < mptcp_snd_wnd)) {
1134b713d006SPaolo Abeni tcp_sk(ssk)->snd_wnd = min_t(u64, U32_MAX, mptcp_snd_wnd);
113592be2f52SPaolo Abeni MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_SNDWNDSHARED);
113692be2f52SPaolo Abeni }
11376f8a612aSFlorian Westphal
11386f8a612aSFlorian Westphal return avail_size;
11396f8a612aSFlorian Westphal }
11406f8a612aSFlorian Westphal
__mptcp_add_ext(struct sk_buff * skb,gfp_t gfp)1141724cfd2eSPaolo Abeni static bool __mptcp_add_ext(struct sk_buff *skb, gfp_t gfp)
1142724cfd2eSPaolo Abeni {
1143724cfd2eSPaolo Abeni struct skb_ext *mpext = __skb_ext_alloc(gfp);
1144724cfd2eSPaolo Abeni
1145724cfd2eSPaolo Abeni if (!mpext)
1146724cfd2eSPaolo Abeni return false;
1147724cfd2eSPaolo Abeni __skb_ext_set(skb, SKB_EXT_MPTCP, mpext);
1148724cfd2eSPaolo Abeni return true;
1149724cfd2eSPaolo Abeni }
1150724cfd2eSPaolo Abeni
__mptcp_do_alloc_tx_skb(struct sock * sk,gfp_t gfp)11516e628cd3SPaolo Abeni static struct sk_buff *__mptcp_do_alloc_tx_skb(struct sock *sk, gfp_t gfp)
1152724cfd2eSPaolo Abeni {
1153724cfd2eSPaolo Abeni struct sk_buff *skb;
1154724cfd2eSPaolo Abeni
11556e628cd3SPaolo Abeni skb = alloc_skb_fclone(MAX_TCP_HEADER, gfp);
1156724cfd2eSPaolo Abeni if (likely(skb)) {
11576e628cd3SPaolo Abeni if (likely(__mptcp_add_ext(skb, gfp))) {
1158724cfd2eSPaolo Abeni skb_reserve(skb, MAX_TCP_HEADER);
1159a52fe46eSEric Dumazet skb->ip_summed = CHECKSUM_PARTIAL;
1160f70cad10SPaolo Abeni INIT_LIST_HEAD(&skb->tcp_tsorted_anchor);
1161724cfd2eSPaolo Abeni return skb;
1162724cfd2eSPaolo Abeni }
1163724cfd2eSPaolo Abeni __kfree_skb(skb);
1164724cfd2eSPaolo Abeni } else {
1165724cfd2eSPaolo Abeni mptcp_enter_memory_pressure(sk);
1166724cfd2eSPaolo Abeni }
1167724cfd2eSPaolo Abeni return NULL;
1168724cfd2eSPaolo Abeni }
1169724cfd2eSPaolo Abeni
__mptcp_alloc_tx_skb(struct sock * sk,struct sock * ssk,gfp_t gfp)1170f70cad10SPaolo Abeni static struct sk_buff *__mptcp_alloc_tx_skb(struct sock *sk, struct sock *ssk, gfp_t gfp)
1171724cfd2eSPaolo Abeni {
1172724cfd2eSPaolo Abeni struct sk_buff *skb;
1173724cfd2eSPaolo Abeni
11746e628cd3SPaolo Abeni skb = __mptcp_do_alloc_tx_skb(sk, gfp);
1175724cfd2eSPaolo Abeni if (!skb)
1176f70cad10SPaolo Abeni return NULL;
1177724cfd2eSPaolo Abeni
1178724cfd2eSPaolo Abeni if (likely(sk_wmem_schedule(ssk, skb->truesize))) {
1179f70cad10SPaolo Abeni tcp_skb_entail(ssk, skb);
1180f70cad10SPaolo Abeni return skb;
1181724cfd2eSPaolo Abeni }
11823ef3905aSYonglong Li tcp_skb_tsorted_anchor_cleanup(skb);
1183724cfd2eSPaolo Abeni kfree_skb(skb);
1184f70cad10SPaolo Abeni return NULL;
1185724cfd2eSPaolo Abeni }
1186724cfd2eSPaolo Abeni
mptcp_alloc_tx_skb(struct sock * sk,struct sock * ssk,bool data_lock_held)1187f70cad10SPaolo Abeni static struct sk_buff *mptcp_alloc_tx_skb(struct sock *sk, struct sock *ssk, bool data_lock_held)
1188724cfd2eSPaolo Abeni {
11891094c6feSPaolo Abeni gfp_t gfp = data_lock_held ? GFP_ATOMIC : sk->sk_allocation;
1190724cfd2eSPaolo Abeni
11911094c6feSPaolo Abeni return __mptcp_alloc_tx_skb(sk, ssk, gfp);
1192724cfd2eSPaolo Abeni }
1193724cfd2eSPaolo Abeni
1194d0cc2987SGeliang Tang /* note: this always recompute the csum on the whole skb, even
1195d0cc2987SGeliang Tang * if we just appended a single frag. More status info needed
1196d0cc2987SGeliang Tang */
mptcp_update_data_checksum(struct sk_buff * skb,int added)1197d0cc2987SGeliang Tang static void mptcp_update_data_checksum(struct sk_buff *skb, int added)
1198d0cc2987SGeliang Tang {
1199d0cc2987SGeliang Tang struct mptcp_ext *mpext = mptcp_get_ext(skb);
1200d0cc2987SGeliang Tang __wsum csum = ~csum_unfold(mpext->csum);
1201d0cc2987SGeliang Tang int offset = skb->len - added;
1202d0cc2987SGeliang Tang
1203d0cc2987SGeliang Tang mpext->csum = csum_fold(csum_block_add(csum, skb_checksum(skb, offset, added, 0), offset));
1204d0cc2987SGeliang Tang }
1205d0cc2987SGeliang Tang
mptcp_update_infinite_map(struct mptcp_sock * msk,struct sock * ssk,struct mptcp_ext * mpext)12061e39e5a3SGeliang Tang static void mptcp_update_infinite_map(struct mptcp_sock *msk,
12071e39e5a3SGeliang Tang struct sock *ssk,
12081e39e5a3SGeliang Tang struct mptcp_ext *mpext)
12091e39e5a3SGeliang Tang {
12101e39e5a3SGeliang Tang if (!mpext)
12111e39e5a3SGeliang Tang return;
12121e39e5a3SGeliang Tang
12131e39e5a3SGeliang Tang mpext->infinite_map = 1;
12141e39e5a3SGeliang Tang mpext->data_len = 0;
12151e39e5a3SGeliang Tang
1216104125b8SGeliang Tang MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_INFINITEMAPTX);
12171e39e5a3SGeliang Tang mptcp_subflow_ctx(ssk)->send_infinite_map = 0;
12181e39e5a3SGeliang Tang pr_fallback(msk);
1219d51991e2SPaolo Abeni mptcp_do_fallback(ssk);
12201e39e5a3SGeliang Tang }
12211e39e5a3SGeliang Tang
122257ced2ebSPaolo Abeni #define MPTCP_MAX_GSO_SIZE (GSO_LEGACY_MAX_SIZE - (MAX_TCP_HEADER + 1))
122357ced2ebSPaolo Abeni
mptcp_sendmsg_frag(struct sock * sk,struct sock * ssk,struct mptcp_data_frag * dfrag,struct mptcp_sendmsg_info * info)122457040755SPaolo Abeni static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
1225d9ca1de8SPaolo Abeni struct mptcp_data_frag *dfrag,
1226caf971dfSPaolo Abeni struct mptcp_sendmsg_info *info)
122757040755SPaolo Abeni {
1228d9ca1de8SPaolo Abeni u64 data_seq = dfrag->data_seq + info->sent;
1229f70cad10SPaolo Abeni int offset = dfrag->offset + info->sent;
12306d0060f6SMat Martineau struct mptcp_sock *msk = mptcp_sk(sk);
12316f8a612aSFlorian Westphal bool zero_window_probe = false;
12326d0060f6SMat Martineau struct mptcp_ext *mpext = NULL;
1233f70cad10SPaolo Abeni bool can_coalesce = false;
1234f70cad10SPaolo Abeni bool reuse_skb = true;
1235f70cad10SPaolo Abeni struct sk_buff *skb;
1236f70cad10SPaolo Abeni size_t copy;
1237f70cad10SPaolo Abeni int i;
12386d0060f6SMat Martineau
1239e4b61351SGeliang Tang pr_debug("msk=%p ssk=%p sending dfrag at seq=%llu len=%u already sent=%u",
1240d9ca1de8SPaolo Abeni msk, ssk, dfrag->data_seq, dfrag->data_len, info->sent);
12416d0060f6SMat Martineau
1242f70cad10SPaolo Abeni if (WARN_ON_ONCE(info->sent > info->limit ||
1243f70cad10SPaolo Abeni info->limit > dfrag->data_len))
1244f70cad10SPaolo Abeni return 0;
1245f70cad10SPaolo Abeni
1246c886d702SPaolo Abeni if (unlikely(!__tcp_can_send(ssk)))
1247c886d702SPaolo Abeni return -EAGAIN;
1248c886d702SPaolo Abeni
1249d9ca1de8SPaolo Abeni /* compute send limit */
125057ced2ebSPaolo Abeni if (unlikely(ssk->sk_gso_max_size > MPTCP_MAX_GSO_SIZE))
125157ced2ebSPaolo Abeni ssk->sk_gso_max_size = MPTCP_MAX_GSO_SIZE;
1252d9ca1de8SPaolo Abeni info->mss_now = tcp_send_mss(ssk, &info->size_goal, info->flags);
1253f70cad10SPaolo Abeni copy = info->size_goal;
1254f70cad10SPaolo Abeni
125557040755SPaolo Abeni skb = tcp_write_queue_tail(ssk);
1256f70cad10SPaolo Abeni if (skb && copy > skb->len) {
125757040755SPaolo Abeni /* Limit the write to the size available in the
125857040755SPaolo Abeni * current skb, if any, so that we create at most a new skb.
125957040755SPaolo Abeni * Explicitly tells TCP internals to avoid collapsing on later
126057040755SPaolo Abeni * queue management operation, to avoid breaking the ext <->
126157040755SPaolo Abeni * SSN association set here
126257040755SPaolo Abeni */
1263d9ca1de8SPaolo Abeni mpext = skb_ext_find(skb, SKB_EXT_MPTCP);
12641094c6feSPaolo Abeni if (!mptcp_skb_can_collapse_to(data_seq, skb, mpext)) {
126557040755SPaolo Abeni TCP_SKB_CB(skb)->eor = 1;
126648428b07SPaolo Abeni tcp_mark_push(tcp_sk(ssk), skb);
12671094c6feSPaolo Abeni goto alloc_skb;
12681094c6feSPaolo Abeni }
12691094c6feSPaolo Abeni
1270f70cad10SPaolo Abeni i = skb_shinfo(skb)->nr_frags;
1271f70cad10SPaolo Abeni can_coalesce = skb_can_coalesce(skb, i, dfrag->page, offset);
1272657b991aSKuniyuki Iwashima if (!can_coalesce && i >= READ_ONCE(sysctl_max_skb_frags)) {
1273f70cad10SPaolo Abeni tcp_mark_push(tcp_sk(ssk), skb);
1274f70cad10SPaolo Abeni goto alloc_skb;
127515e6ca97SPaolo Abeni }
127618b683bfSPaolo Abeni
1277f70cad10SPaolo Abeni copy -= skb->len;
1278f70cad10SPaolo Abeni } else {
12791094c6feSPaolo Abeni alloc_skb:
1280f70cad10SPaolo Abeni skb = mptcp_alloc_tx_skb(sk, ssk, info->data_lock_held);
1281f70cad10SPaolo Abeni if (!skb)
1282f70cad10SPaolo Abeni return -ENOMEM;
1283f70cad10SPaolo Abeni
1284f70cad10SPaolo Abeni i = skb_shinfo(skb)->nr_frags;
1285f70cad10SPaolo Abeni reuse_skb = false;
1286f70cad10SPaolo Abeni mpext = skb_ext_find(skb, SKB_EXT_MPTCP);
1287f70cad10SPaolo Abeni }
12881094c6feSPaolo Abeni
12896f8a612aSFlorian Westphal /* Zero window and all data acked? Probe. */
1290b713d006SPaolo Abeni copy = mptcp_check_allowed_size(msk, ssk, data_seq, copy);
1291f70cad10SPaolo Abeni if (copy == 0) {
12927439d687SPaolo Abeni u64 snd_una = READ_ONCE(msk->snd_una);
12937439d687SPaolo Abeni
129472377ab2SPaolo Abeni if (snd_una != msk->snd_nxt || tcp_write_queue_tail(ssk)) {
129527728ba8SEric Dumazet tcp_remove_empty_skb(ssk);
12966f8a612aSFlorian Westphal return 0;
12976f8a612aSFlorian Westphal }
12986f8a612aSFlorian Westphal
1299f70cad10SPaolo Abeni zero_window_probe = true;
1300f70cad10SPaolo Abeni data_seq = snd_una - 1;
1301f70cad10SPaolo Abeni copy = 1;
1302f70cad10SPaolo Abeni }
1303f70cad10SPaolo Abeni
1304f70cad10SPaolo Abeni copy = min_t(size_t, copy, info->limit - info->sent);
1305f70cad10SPaolo Abeni if (!sk_wmem_schedule(ssk, copy)) {
130627728ba8SEric Dumazet tcp_remove_empty_skb(ssk);
1307e2223995SPaolo Abeni return -ENOMEM;
130835759383SFlorian Westphal }
130918b683bfSPaolo Abeni
1310f70cad10SPaolo Abeni if (can_coalesce) {
1311f70cad10SPaolo Abeni skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
1312f70cad10SPaolo Abeni } else {
1313f70cad10SPaolo Abeni get_page(dfrag->page);
1314f70cad10SPaolo Abeni skb_fill_page_desc(skb, i, dfrag->page, offset, copy);
131557040755SPaolo Abeni }
131657040755SPaolo Abeni
1317f70cad10SPaolo Abeni skb->len += copy;
1318f70cad10SPaolo Abeni skb->data_len += copy;
1319f70cad10SPaolo Abeni skb->truesize += copy;
1320f70cad10SPaolo Abeni sk_wmem_queued_add(ssk, copy);
1321f70cad10SPaolo Abeni sk_mem_charge(ssk, copy);
1322f70cad10SPaolo Abeni WRITE_ONCE(tcp_sk(ssk)->write_seq, tcp_sk(ssk)->write_seq + copy);
1323f70cad10SPaolo Abeni TCP_SKB_CB(skb)->end_seq += copy;
1324f70cad10SPaolo Abeni tcp_skb_pcount_set(skb, 0);
1325f70cad10SPaolo Abeni
1326f70cad10SPaolo Abeni /* on skb reuse we just need to update the DSS len */
1327f70cad10SPaolo Abeni if (reuse_skb) {
1328f70cad10SPaolo Abeni TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH;
1329f70cad10SPaolo Abeni mpext->data_len += copy;
1330f70cad10SPaolo Abeni goto out;
1331724cfd2eSPaolo Abeni }
13326d0060f6SMat Martineau
13336d0060f6SMat Martineau memset(mpext, 0, sizeof(*mpext));
1334d9ca1de8SPaolo Abeni mpext->data_seq = data_seq;
13356d0060f6SMat Martineau mpext->subflow_seq = mptcp_subflow_ctx(ssk)->rel_write_seq;
1336f70cad10SPaolo Abeni mpext->data_len = copy;
13376d0060f6SMat Martineau mpext->use_map = 1;
13386d0060f6SMat Martineau mpext->dsn64 = 1;
13396d0060f6SMat Martineau
13406d0060f6SMat Martineau pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d",
13416d0060f6SMat Martineau mpext->data_seq, mpext->subflow_seq, mpext->data_len,
13426d0060f6SMat Martineau mpext->dsn64);
13436d0060f6SMat Martineau
13446f8a612aSFlorian Westphal if (zero_window_probe) {
1345f70cad10SPaolo Abeni mptcp_subflow_ctx(ssk)->rel_write_seq += copy;
13466f8a612aSFlorian Westphal mpext->frozen = 1;
1347d0cc2987SGeliang Tang if (READ_ONCE(msk->csum_enabled))
1348f70cad10SPaolo Abeni mptcp_update_data_checksum(skb, copy);
13496f8a612aSFlorian Westphal tcp_push_pending_frames(ssk);
1350d0cc2987SGeliang Tang return 0;
13516f8a612aSFlorian Westphal }
135257040755SPaolo Abeni out:
1353d0cc2987SGeliang Tang if (READ_ONCE(msk->csum_enabled))
1354f70cad10SPaolo Abeni mptcp_update_data_checksum(skb, copy);
13551e39e5a3SGeliang Tang if (mptcp_subflow_ctx(ssk)->send_infinite_map)
13561e39e5a3SGeliang Tang mptcp_update_infinite_map(msk, ssk, mpext);
13570eb4e7eeSGeliang Tang trace_mptcp_sendmsg_frag(mpext);
1358f70cad10SPaolo Abeni mptcp_subflow_ctx(ssk)->rel_write_seq += copy;
1359f70cad10SPaolo Abeni return copy;
13606d0060f6SMat Martineau }
13616d0060f6SMat Martineau
1362d5f49190SPaolo Abeni #define MPTCP_SEND_BURST_SIZE ((1 << 16) - \
1363d5f49190SPaolo Abeni sizeof(struct tcphdr) - \
1364d5f49190SPaolo Abeni MAX_TCP_OPTION_SPACE - \
1365d5f49190SPaolo Abeni sizeof(struct ipv6hdr) - \
1366d5f49190SPaolo Abeni sizeof(struct frag_hdr))
1367d5f49190SPaolo Abeni
1368d5f49190SPaolo Abeni struct subflow_send_info {
1369d5f49190SPaolo Abeni struct sock *ssk;
13703ce0852cSPaolo Abeni u64 linger_time;
1371d5f49190SPaolo Abeni };
1372d5f49190SPaolo Abeni
mptcp_subflow_set_active(struct mptcp_subflow_context * subflow)1373ff5a0b42SPaolo Abeni void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow)
1374ff5a0b42SPaolo Abeni {
1375ff5a0b42SPaolo Abeni if (!subflow->stale)
1376ff5a0b42SPaolo Abeni return;
1377ff5a0b42SPaolo Abeni
1378ff5a0b42SPaolo Abeni subflow->stale = 0;
1379fc1b4e3bSPaolo Abeni MPTCP_INC_STATS(sock_net(mptcp_subflow_tcp_sock(subflow)), MPTCP_MIB_SUBFLOWRECOVER);
1380ff5a0b42SPaolo Abeni }
1381ff5a0b42SPaolo Abeni
mptcp_subflow_active(struct mptcp_subflow_context * subflow)1382ff5a0b42SPaolo Abeni bool mptcp_subflow_active(struct mptcp_subflow_context *subflow)
1383ff5a0b42SPaolo Abeni {
1384ff5a0b42SPaolo Abeni if (unlikely(subflow->stale)) {
1385ff5a0b42SPaolo Abeni u32 rcv_tstamp = READ_ONCE(tcp_sk(mptcp_subflow_tcp_sock(subflow))->rcv_tstamp);
1386ff5a0b42SPaolo Abeni
1387ff5a0b42SPaolo Abeni if (subflow->stale_rcv_tstamp == rcv_tstamp)
1388ff5a0b42SPaolo Abeni return false;
1389ff5a0b42SPaolo Abeni
1390ff5a0b42SPaolo Abeni mptcp_subflow_set_active(subflow);
1391ff5a0b42SPaolo Abeni }
1392ff5a0b42SPaolo Abeni return __mptcp_subflow_active(subflow);
1393ff5a0b42SPaolo Abeni }
1394ff5a0b42SPaolo Abeni
13953ce0852cSPaolo Abeni #define SSK_MODE_ACTIVE 0
13963ce0852cSPaolo Abeni #define SSK_MODE_BACKUP 1
13973ce0852cSPaolo Abeni #define SSK_MODE_MAX 2
13983ce0852cSPaolo Abeni
139933d41c9cSPaolo Abeni /* implement the mptcp packet scheduler;
140033d41c9cSPaolo Abeni * returns the subflow that will transmit the next DSS
140133d41c9cSPaolo Abeni * additionally updates the rtx timeout
140233d41c9cSPaolo Abeni */
mptcp_subflow_get_send(struct mptcp_sock * msk)140307336a87SGeliang Tang struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk)
1404f296234cSPeter Krystad {
14053ce0852cSPaolo Abeni struct subflow_send_info send_info[SSK_MODE_MAX];
1406f296234cSPeter Krystad struct mptcp_subflow_context *subflow;
140733d41c9cSPaolo Abeni struct sock *sk = (struct sock *)msk;
14083ce0852cSPaolo Abeni u32 pace, burst, wmem;
1409d5f49190SPaolo Abeni int i, nr_active = 0;
1410d5f49190SPaolo Abeni struct sock *ssk;
14113ce0852cSPaolo Abeni u64 linger_time;
141233d41c9cSPaolo Abeni long tout = 0;
1413f296234cSPeter Krystad
1414d5f49190SPaolo Abeni /* pick the subflow with the lower wmem/wspace ratio */
14153ce0852cSPaolo Abeni for (i = 0; i < SSK_MODE_MAX; ++i) {
1416d5f49190SPaolo Abeni send_info[i].ssk = NULL;
14173ce0852cSPaolo Abeni send_info[i].linger_time = -1;
1418d5f49190SPaolo Abeni }
14193ce0852cSPaolo Abeni
1420d5f49190SPaolo Abeni mptcp_for_each_subflow(msk, subflow) {
1421e10a9892SGeliang Tang trace_mptcp_subflow_get_send(subflow);
1422d5f49190SPaolo Abeni ssk = mptcp_subflow_tcp_sock(subflow);
1423d5f49190SPaolo Abeni if (!mptcp_subflow_active(subflow))
1424f296234cSPeter Krystad continue;
1425d5f49190SPaolo Abeni
142633d41c9cSPaolo Abeni tout = max(tout, mptcp_timeout_from_subflow(subflow));
1427d5f49190SPaolo Abeni nr_active += !subflow->backup;
14283ce0852cSPaolo Abeni pace = subflow->avg_pacing_rate;
14293ce0852cSPaolo Abeni if (unlikely(!pace)) {
14303ce0852cSPaolo Abeni /* init pacing rate from socket */
14313ce0852cSPaolo Abeni subflow->avg_pacing_rate = READ_ONCE(ssk->sk_pacing_rate);
14323ce0852cSPaolo Abeni pace = subflow->avg_pacing_rate;
1433d5f49190SPaolo Abeni if (!pace)
1434d5f49190SPaolo Abeni continue;
14353ce0852cSPaolo Abeni }
1436d5f49190SPaolo Abeni
14373ce0852cSPaolo Abeni linger_time = div_u64((u64)READ_ONCE(ssk->sk_wmem_queued) << 32, pace);
14383ce0852cSPaolo Abeni if (linger_time < send_info[subflow->backup].linger_time) {
1439d5f49190SPaolo Abeni send_info[subflow->backup].ssk = ssk;
14403ce0852cSPaolo Abeni send_info[subflow->backup].linger_time = linger_time;
1441d5f49190SPaolo Abeni }
1442f296234cSPeter Krystad }
144333d41c9cSPaolo Abeni __mptcp_set_timeout(sk, tout);
1444f296234cSPeter Krystad
1445d5f49190SPaolo Abeni /* pick the best backup if no other subflow is active */
1446d5f49190SPaolo Abeni if (!nr_active)
14473ce0852cSPaolo Abeni send_info[SSK_MODE_ACTIVE].ssk = send_info[SSK_MODE_BACKUP].ssk;
1448d5f49190SPaolo Abeni
14493ce0852cSPaolo Abeni /* According to the blest algorithm, to avoid HoL blocking for the
14503ce0852cSPaolo Abeni * faster flow, we need to:
14513ce0852cSPaolo Abeni * - estimate the faster flow linger time
14523ce0852cSPaolo Abeni * - use the above to estimate the amount of byte transferred
14533ce0852cSPaolo Abeni * by the faster flow
14543ce0852cSPaolo Abeni * - check that the amount of queued data is greter than the above,
14553ce0852cSPaolo Abeni * otherwise do not use the picked, slower, subflow
14563ce0852cSPaolo Abeni * We select the subflow with the shorter estimated time to flush
14573ce0852cSPaolo Abeni * the queued mem, which basically ensure the above. We just need
14583ce0852cSPaolo Abeni * to check that subflow has a non empty cwin.
14593ce0852cSPaolo Abeni */
14603ce0852cSPaolo Abeni ssk = send_info[SSK_MODE_ACTIVE].ssk;
1461b713d006SPaolo Abeni if (!ssk || !sk_stream_memory_free(ssk))
1462d5f49190SPaolo Abeni return NULL;
14633ce0852cSPaolo Abeni
1464b713d006SPaolo Abeni burst = min_t(int, MPTCP_SEND_BURST_SIZE, mptcp_wnd_end(msk) - msk->snd_nxt);
14653ce0852cSPaolo Abeni wmem = READ_ONCE(ssk->sk_wmem_queued);
1466ebc1e08fSGeliang Tang if (!burst)
1467b713d006SPaolo Abeni return ssk;
1468b713d006SPaolo Abeni
14693ce0852cSPaolo Abeni subflow = mptcp_subflow_ctx(ssk);
14703ce0852cSPaolo Abeni subflow->avg_pacing_rate = div_u64((u64)subflow->avg_pacing_rate * wmem +
14713ce0852cSPaolo Abeni READ_ONCE(ssk->sk_pacing_rate) * burst,
14723ce0852cSPaolo Abeni burst + wmem);
14733ce0852cSPaolo Abeni msk->snd_burst = burst;
14743ce0852cSPaolo Abeni return ssk;
1475f296234cSPeter Krystad }
1476f296234cSPeter Krystad
mptcp_push_release(struct sock * ssk,struct mptcp_sendmsg_info * info)1477b8e0def3SGeliang Tang static void mptcp_push_release(struct sock *ssk, struct mptcp_sendmsg_info *info)
1478d9ca1de8SPaolo Abeni {
1479d9ca1de8SPaolo Abeni tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, info->size_goal);
1480d9ca1de8SPaolo Abeni release_sock(ssk);
1481d9ca1de8SPaolo Abeni }
1482d9ca1de8SPaolo Abeni
mptcp_update_post_push(struct mptcp_sock * msk,struct mptcp_data_frag * dfrag,u32 sent)14830d199e43SFlorian Westphal static void mptcp_update_post_push(struct mptcp_sock *msk,
14840d199e43SFlorian Westphal struct mptcp_data_frag *dfrag,
14850d199e43SFlorian Westphal u32 sent)
14860d199e43SFlorian Westphal {
14870d199e43SFlorian Westphal u64 snd_nxt_new = dfrag->data_seq;
14880d199e43SFlorian Westphal
14890d199e43SFlorian Westphal dfrag->already_sent += sent;
14900d199e43SFlorian Westphal
14910d199e43SFlorian Westphal msk->snd_burst -= sent;
14920d199e43SFlorian Westphal
14930d199e43SFlorian Westphal snd_nxt_new += dfrag->already_sent;
14940d199e43SFlorian Westphal
14950d199e43SFlorian Westphal /* snd_nxt_new can be smaller than snd_nxt in case mptcp
14960d199e43SFlorian Westphal * is recovering after a failover. In that event, this re-sends
14970d199e43SFlorian Westphal * old segments.
14980d199e43SFlorian Westphal *
14990d199e43SFlorian Westphal * Thus compute snd_nxt_new candidate based on
15000d199e43SFlorian Westphal * the dfrag->data_seq that was sent and the data
15010d199e43SFlorian Westphal * that has been handed to the subflow for transmission
15020d199e43SFlorian Westphal * and skip update in case it was old dfrag.
15030d199e43SFlorian Westphal */
150438967f42SPaolo Abeni if (likely(after64(snd_nxt_new, msk->snd_nxt))) {
150538967f42SPaolo Abeni msk->bytes_sent += snd_nxt_new - msk->snd_nxt;
15060d199e43SFlorian Westphal msk->snd_nxt = snd_nxt_new;
15070d199e43SFlorian Westphal }
150838967f42SPaolo Abeni }
15090d199e43SFlorian Westphal
mptcp_check_and_set_pending(struct sock * sk)15108b38217aSMaxim Galaganov void mptcp_check_and_set_pending(struct sock *sk)
15113241a9c0SFlorian Westphal {
1512877a72e3SPaolo Abeni if (mptcp_send_head(sk)) {
1513877a72e3SPaolo Abeni mptcp_data_lock(sk);
1514877a72e3SPaolo Abeni mptcp_sk(sk)->cb_flags |= BIT(MPTCP_PUSH_PENDING);
1515877a72e3SPaolo Abeni mptcp_data_unlock(sk);
1516877a72e3SPaolo Abeni }
15173241a9c0SFlorian Westphal }
15183241a9c0SFlorian Westphal
__subflow_push_pending(struct sock * sk,struct sock * ssk,struct mptcp_sendmsg_info * info)1519c5b4297dSGeliang Tang static int __subflow_push_pending(struct sock *sk, struct sock *ssk,
1520c5b4297dSGeliang Tang struct mptcp_sendmsg_info *info)
1521c5b4297dSGeliang Tang {
1522c5b4297dSGeliang Tang struct mptcp_sock *msk = mptcp_sk(sk);
1523c5b4297dSGeliang Tang struct mptcp_data_frag *dfrag;
1524c5b4297dSGeliang Tang int len, copied = 0, err = 0;
1525c5b4297dSGeliang Tang
1526c5b4297dSGeliang Tang while ((dfrag = mptcp_send_head(sk))) {
1527c5b4297dSGeliang Tang info->sent = dfrag->already_sent;
1528c5b4297dSGeliang Tang info->limit = dfrag->data_len;
1529c5b4297dSGeliang Tang len = dfrag->data_len - dfrag->already_sent;
1530c5b4297dSGeliang Tang while (len > 0) {
1531c5b4297dSGeliang Tang int ret = 0;
1532c5b4297dSGeliang Tang
1533c5b4297dSGeliang Tang ret = mptcp_sendmsg_frag(sk, ssk, dfrag, info);
1534c5b4297dSGeliang Tang if (ret <= 0) {
1535c5b4297dSGeliang Tang err = copied ? : ret;
1536c5b4297dSGeliang Tang goto out;
1537c5b4297dSGeliang Tang }
1538c5b4297dSGeliang Tang
1539c5b4297dSGeliang Tang info->sent += ret;
1540c5b4297dSGeliang Tang copied += ret;
1541c5b4297dSGeliang Tang len -= ret;
1542c5b4297dSGeliang Tang
1543c5b4297dSGeliang Tang mptcp_update_post_push(msk, dfrag, ret);
1544c5b4297dSGeliang Tang }
1545c5b4297dSGeliang Tang WRITE_ONCE(msk->first_pending, mptcp_send_next(sk));
1546c5b4297dSGeliang Tang
1547c5b4297dSGeliang Tang if (msk->snd_burst <= 0 ||
1548c5b4297dSGeliang Tang !sk_stream_memory_free(ssk) ||
1549c5b4297dSGeliang Tang !mptcp_subflow_active(mptcp_subflow_ctx(ssk))) {
1550c5b4297dSGeliang Tang err = copied;
1551c5b4297dSGeliang Tang goto out;
1552c5b4297dSGeliang Tang }
1553c5b4297dSGeliang Tang mptcp_set_timeout(sk);
1554c5b4297dSGeliang Tang }
1555c5b4297dSGeliang Tang err = copied;
1556c5b4297dSGeliang Tang
1557c5b4297dSGeliang Tang out:
1558c5b4297dSGeliang Tang return err;
1559c5b4297dSGeliang Tang }
1560c5b4297dSGeliang Tang
__mptcp_push_pending(struct sock * sk,unsigned int flags)1561ff5a0b42SPaolo Abeni void __mptcp_push_pending(struct sock *sk, unsigned int flags)
1562d9ca1de8SPaolo Abeni {
1563d9ca1de8SPaolo Abeni struct sock *prev_ssk = NULL, *ssk = NULL;
1564d9ca1de8SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
1565d9ca1de8SPaolo Abeni struct mptcp_sendmsg_info info = {
1566d9ca1de8SPaolo Abeni .flags = flags,
1567d9ca1de8SPaolo Abeni };
15680522b424SGeliang Tang bool do_check_data_fin = false;
15690fa1b378SGeliang Tang int push_count = 1;
1570d9ca1de8SPaolo Abeni
15710fa1b378SGeliang Tang while (mptcp_send_head(sk) && (push_count > 0)) {
15720fa1b378SGeliang Tang struct mptcp_subflow_context *subflow;
1573d9ca1de8SPaolo Abeni int ret = 0;
1574d9ca1de8SPaolo Abeni
15750fa1b378SGeliang Tang if (mptcp_sched_get_send(msk))
15760fa1b378SGeliang Tang break;
1577d9ca1de8SPaolo Abeni
15780fa1b378SGeliang Tang push_count = 0;
15790fa1b378SGeliang Tang
15800fa1b378SGeliang Tang mptcp_for_each_subflow(msk, subflow) {
15810fa1b378SGeliang Tang if (READ_ONCE(subflow->scheduled)) {
15820fa1b378SGeliang Tang mptcp_subflow_set_scheduled(subflow, false);
15830fa1b378SGeliang Tang
15840fa1b378SGeliang Tang prev_ssk = ssk;
15850fa1b378SGeliang Tang ssk = mptcp_subflow_tcp_sock(subflow);
15860fa1b378SGeliang Tang if (ssk != prev_ssk) {
15879758f40eSPaolo Abeni /* First check. If the ssk has changed since
15889758f40eSPaolo Abeni * the last round, release prev_ssk
1589d9ca1de8SPaolo Abeni */
15900fa1b378SGeliang Tang if (prev_ssk)
1591b8e0def3SGeliang Tang mptcp_push_release(prev_ssk, &info);
1592d9ca1de8SPaolo Abeni
15939758f40eSPaolo Abeni /* Need to lock the new subflow only if different
15949758f40eSPaolo Abeni * from the previous one, otherwise we are still
15959758f40eSPaolo Abeni * helding the relevant lock
15969758f40eSPaolo Abeni */
1597d9ca1de8SPaolo Abeni lock_sock(ssk);
15980fa1b378SGeliang Tang }
15990fa1b378SGeliang Tang
16000fa1b378SGeliang Tang push_count++;
1601d9ca1de8SPaolo Abeni
1602c5b4297dSGeliang Tang ret = __subflow_push_pending(sk, ssk, &info);
1603d9ca1de8SPaolo Abeni if (ret <= 0) {
16040fa1b378SGeliang Tang if (ret != -EAGAIN ||
16050fa1b378SGeliang Tang (1 << ssk->sk_state) &
16060fa1b378SGeliang Tang (TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSE))
16070fa1b378SGeliang Tang push_count--;
1608c886d702SPaolo Abeni continue;
1609d9ca1de8SPaolo Abeni }
16100522b424SGeliang Tang do_check_data_fin = true;
1611d9ca1de8SPaolo Abeni }
16120fa1b378SGeliang Tang }
16130fa1b378SGeliang Tang }
1614d9ca1de8SPaolo Abeni
1615d9ca1de8SPaolo Abeni /* at this point we held the socket lock for the last subflow we used */
1616d9ca1de8SPaolo Abeni if (ssk)
1617b8e0def3SGeliang Tang mptcp_push_release(ssk, &info);
1618d9ca1de8SPaolo Abeni
161933d41c9cSPaolo Abeni /* ensure the rtx timer is running */
1620f6909dc1SPaolo Abeni if (!mptcp_rtx_timer_pending(sk))
1621f6909dc1SPaolo Abeni mptcp_reset_rtx_timer(sk);
16220522b424SGeliang Tang if (do_check_data_fin)
162381c1d029SPaolo Abeni mptcp_check_send_data_fin(sk);
1624d9ca1de8SPaolo Abeni }
1625d9ca1de8SPaolo Abeni
__mptcp_subflow_push_pending(struct sock * sk,struct sock * ssk,bool first)162673a0052aSGeliang Tang static void __mptcp_subflow_push_pending(struct sock *sk, struct sock *ssk, bool first)
16276e628cd3SPaolo Abeni {
16286e628cd3SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
16291094c6feSPaolo Abeni struct mptcp_sendmsg_info info = {
16301094c6feSPaolo Abeni .data_lock_held = true,
16311094c6feSPaolo Abeni };
16320fa1b378SGeliang Tang bool keep_pushing = true;
1633b19bc294SPaolo Abeni struct sock *xmit_ssk;
1634c5b4297dSGeliang Tang int copied = 0;
16356e628cd3SPaolo Abeni
16366e628cd3SPaolo Abeni info.flags = 0;
16370fa1b378SGeliang Tang while (mptcp_send_head(sk) && keep_pushing) {
16380fa1b378SGeliang Tang struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
16396e628cd3SPaolo Abeni int ret = 0;
16406e628cd3SPaolo Abeni
164173a0052aSGeliang Tang /* check for a different subflow usage only after
1642b19bc294SPaolo Abeni * spooling the first chunk of data
1643b19bc294SPaolo Abeni */
16440fa1b378SGeliang Tang if (first) {
16450fa1b378SGeliang Tang mptcp_subflow_set_scheduled(subflow, false);
1646c5b4297dSGeliang Tang ret = __subflow_push_pending(sk, ssk, &info);
1647b19bc294SPaolo Abeni first = false;
1648c5b4297dSGeliang Tang if (ret <= 0)
1649c5b4297dSGeliang Tang break;
1650c5b4297dSGeliang Tang copied += ret;
16510fa1b378SGeliang Tang continue;
16520fa1b378SGeliang Tang }
16530fa1b378SGeliang Tang
16540fa1b378SGeliang Tang if (mptcp_sched_get_send(msk))
16550fa1b378SGeliang Tang goto out;
16560fa1b378SGeliang Tang
16570fa1b378SGeliang Tang if (READ_ONCE(subflow->scheduled)) {
16580fa1b378SGeliang Tang mptcp_subflow_set_scheduled(subflow, false);
16590fa1b378SGeliang Tang ret = __subflow_push_pending(sk, ssk, &info);
16600fa1b378SGeliang Tang if (ret <= 0)
16610fa1b378SGeliang Tang keep_pushing = false;
16620fa1b378SGeliang Tang copied += ret;
16630fa1b378SGeliang Tang }
16640fa1b378SGeliang Tang
16650fa1b378SGeliang Tang mptcp_for_each_subflow(msk, subflow) {
16660fa1b378SGeliang Tang if (READ_ONCE(subflow->scheduled)) {
16670fa1b378SGeliang Tang xmit_ssk = mptcp_subflow_tcp_sock(subflow);
16680fa1b378SGeliang Tang if (xmit_ssk != ssk) {
16690fa1b378SGeliang Tang mptcp_subflow_delegate(subflow,
16700fa1b378SGeliang Tang MPTCP_DELEGATE_SEND);
16710fa1b378SGeliang Tang keep_pushing = false;
16720fa1b378SGeliang Tang }
16730fa1b378SGeliang Tang }
16740fa1b378SGeliang Tang }
16756e628cd3SPaolo Abeni }
16766e628cd3SPaolo Abeni
16776e628cd3SPaolo Abeni out:
16786e628cd3SPaolo Abeni /* __mptcp_alloc_tx_skb could have released some wmem and we are
16796e628cd3SPaolo Abeni * not going to flush it via release_sock()
16806e628cd3SPaolo Abeni */
16816e628cd3SPaolo Abeni if (copied) {
16826e628cd3SPaolo Abeni tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle,
16836e628cd3SPaolo Abeni info.size_goal);
1684f6909dc1SPaolo Abeni if (!mptcp_rtx_timer_pending(sk))
1685f6909dc1SPaolo Abeni mptcp_reset_rtx_timer(sk);
1686d09d818eSPaolo Abeni
16876e628cd3SPaolo Abeni if (msk->snd_data_fin_enable &&
16886e628cd3SPaolo Abeni msk->snd_nxt + 1 == msk->write_seq)
16896e628cd3SPaolo Abeni mptcp_schedule_work(sk);
16906e628cd3SPaolo Abeni }
16916e628cd3SPaolo Abeni }
16926e628cd3SPaolo Abeni
mptcp_set_nospace(struct sock * sk)16935cf92bbaSPaolo Abeni static void mptcp_set_nospace(struct sock *sk)
16945cf92bbaSPaolo Abeni {
16955cf92bbaSPaolo Abeni /* enable autotune */
16965cf92bbaSPaolo Abeni set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
16975cf92bbaSPaolo Abeni
16985cf92bbaSPaolo Abeni /* will be cleared on avail space */
16995cf92bbaSPaolo Abeni set_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags);
17005cf92bbaSPaolo Abeni }
17015cf92bbaSPaolo Abeni
17027d803344SPaolo Abeni static int mptcp_disconnect(struct sock *sk, int flags);
17037d803344SPaolo Abeni
mptcp_sendmsg_fastopen(struct sock * sk,struct msghdr * msg,size_t len,int * copied_syn)1704a2702a07SPaolo Abeni static int mptcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg,
1705fa9e5746SPaolo Abeni size_t len, int *copied_syn)
1706fa9e5746SPaolo Abeni {
1707fa9e5746SPaolo Abeni unsigned int saved_flags = msg->msg_flags;
1708fa9e5746SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
1709a2702a07SPaolo Abeni struct sock *ssk;
1710fa9e5746SPaolo Abeni int ret;
1711fa9e5746SPaolo Abeni
1712a2702a07SPaolo Abeni /* on flags based fastopen the mptcp is supposed to create the
1713a2702a07SPaolo Abeni * first subflow right now. Otherwise we are in the defer_connect
1714a2702a07SPaolo Abeni * path, and the first subflow must be already present.
1715a2702a07SPaolo Abeni * Since the defer_connect flag is cleared after the first succsful
1716a2702a07SPaolo Abeni * fastopen attempt, no need to check for additional subflow status.
1717a2702a07SPaolo Abeni */
1718ddb1a072SPaolo Abeni if (msg->msg_flags & MSG_FASTOPEN) {
17193f326a82SPaolo Abeni ssk = __mptcp_nmpc_sk(msk);
17203f326a82SPaolo Abeni if (IS_ERR(ssk))
17213f326a82SPaolo Abeni return PTR_ERR(ssk);
1722ddb1a072SPaolo Abeni }
1723a2702a07SPaolo Abeni if (!msk->first)
1724a2702a07SPaolo Abeni return -EINVAL;
1725a2702a07SPaolo Abeni
1726a2702a07SPaolo Abeni ssk = msk->first;
1727a2702a07SPaolo Abeni
1728fa9e5746SPaolo Abeni lock_sock(ssk);
1729fa9e5746SPaolo Abeni msg->msg_flags |= MSG_DONTWAIT;
17307d803344SPaolo Abeni msk->fastopening = 1;
1731fa9e5746SPaolo Abeni ret = tcp_sendmsg_fastopen(ssk, msg, copied_syn, len, NULL);
17327d803344SPaolo Abeni msk->fastopening = 0;
1733fa9e5746SPaolo Abeni msg->msg_flags = saved_flags;
1734fa9e5746SPaolo Abeni release_sock(ssk);
1735fa9e5746SPaolo Abeni
1736fa9e5746SPaolo Abeni /* do the blocking bits of inet_stream_connect outside the ssk socket lock */
1737fa9e5746SPaolo Abeni if (ret == -EINPROGRESS && !(msg->msg_flags & MSG_DONTWAIT)) {
1738fa9e5746SPaolo Abeni ret = __inet_stream_connect(sk->sk_socket, msg->msg_name,
1739fa9e5746SPaolo Abeni msg->msg_namelen, msg->msg_flags, 1);
1740fa9e5746SPaolo Abeni
1741fa9e5746SPaolo Abeni /* Keep the same behaviour of plain TCP: zero the copied bytes in
1742fa9e5746SPaolo Abeni * case of any error, except timeout or signal
1743fa9e5746SPaolo Abeni */
1744fa9e5746SPaolo Abeni if (ret && ret != -EINPROGRESS && ret != -ERESTARTSYS && ret != -EINTR)
1745fa9e5746SPaolo Abeni *copied_syn = 0;
17467d803344SPaolo Abeni } else if (ret && ret != -EINPROGRESS) {
1747c2b2ae39SPaolo Abeni /* The disconnect() op called by tcp_sendmsg_fastopen()/
1748c2b2ae39SPaolo Abeni * __inet_stream_connect() can fail, due to looking check,
1749c2b2ae39SPaolo Abeni * see mptcp_disconnect().
1750c2b2ae39SPaolo Abeni * Attempt it again outside the problematic scope.
1751c2b2ae39SPaolo Abeni */
1752c2b2ae39SPaolo Abeni if (!mptcp_disconnect(sk, 0))
1753c2b2ae39SPaolo Abeni sk->sk_socket->state = SS_UNCONNECTED;
1754fa9e5746SPaolo Abeni }
175508e39c0dSEric Dumazet inet_clear_bit(DEFER_CONNECT, sk);
1756fa9e5746SPaolo Abeni
1757fa9e5746SPaolo Abeni return ret;
1758fa9e5746SPaolo Abeni }
1759fa9e5746SPaolo Abeni
mptcp_sendmsg(struct sock * sk,struct msghdr * msg,size_t len)1760f870fa0bSMat Martineau static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1761f870fa0bSMat Martineau {
1762f870fa0bSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk);
176317091708SFlorian Westphal struct page_frag *pfrag;
17646d0060f6SMat Martineau size_t copied = 0;
1765caf971dfSPaolo Abeni int ret = 0;
17666d0060f6SMat Martineau long timeo;
1767f870fa0bSMat Martineau
1768987858e5SPaolo Abeni /* silently ignore everything else */
17691e777f39SDmytro Shytyi msg->msg_flags &= MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_FASTOPEN;
1770987858e5SPaolo Abeni
17716511882cSPaolo Abeni lock_sock(sk);
17721954b860SMat Martineau
177308e39c0dSEric Dumazet if (unlikely(inet_test_bit(DEFER_CONNECT, sk) ||
177408e39c0dSEric Dumazet msg->msg_flags & MSG_FASTOPEN)) {
1775d98a82a6SDmytro Shytyi int copied_syn = 0;
1776d98a82a6SDmytro Shytyi
1777a2702a07SPaolo Abeni ret = mptcp_sendmsg_fastopen(sk, msg, len, &copied_syn);
1778d98a82a6SDmytro Shytyi copied += copied_syn;
1779fa9e5746SPaolo Abeni if (ret == -EINPROGRESS && copied_syn > 0)
1780d98a82a6SDmytro Shytyi goto out;
1781fa9e5746SPaolo Abeni else if (ret)
178269800e51SPaolo Abeni goto do_error;
1783d98a82a6SDmytro Shytyi }
1784d98a82a6SDmytro Shytyi
17851954b860SMat Martineau timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
17861954b860SMat Martineau
17871954b860SMat Martineau if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) {
17881954b860SMat Martineau ret = sk_stream_wait_connect(sk, &timeo);
17891954b860SMat Martineau if (ret)
179069800e51SPaolo Abeni goto do_error;
17911954b860SMat Martineau }
17921954b860SMat Martineau
179369800e51SPaolo Abeni ret = -EPIPE;
179469800e51SPaolo Abeni if (unlikely(sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)))
179569800e51SPaolo Abeni goto do_error;
179669800e51SPaolo Abeni
179717091708SFlorian Westphal pfrag = sk_page_frag(sk);
179818b683bfSPaolo Abeni
1799d9ca1de8SPaolo Abeni while (msg_data_left(msg)) {
1800724cfd2eSPaolo Abeni int total_ts, frag_truesize = 0;
1801d9ca1de8SPaolo Abeni struct mptcp_data_frag *dfrag;
1802d9ca1de8SPaolo Abeni bool dfrag_collapsed;
1803d9ca1de8SPaolo Abeni size_t psize, offset;
1804d9ca1de8SPaolo Abeni
1805d9ca1de8SPaolo Abeni /* reuse tail pfrag, if possible, or carve a new one from the
1806d9ca1de8SPaolo Abeni * page allocator
1807fb529e62SFlorian Westphal */
1808d9ca1de8SPaolo Abeni dfrag = mptcp_pending_tail(sk);
1809d9ca1de8SPaolo Abeni dfrag_collapsed = mptcp_frag_can_collapse_to(msk, pfrag, dfrag);
1810d9ca1de8SPaolo Abeni if (!dfrag_collapsed) {
1811d9ca1de8SPaolo Abeni if (!sk_stream_memory_free(sk))
1812d9ca1de8SPaolo Abeni goto wait_for_memory;
18136e628cd3SPaolo Abeni
1814d9ca1de8SPaolo Abeni if (!mptcp_page_frag_refill(sk, pfrag))
1815d9ca1de8SPaolo Abeni goto wait_for_memory;
1816d9ca1de8SPaolo Abeni
1817d9ca1de8SPaolo Abeni dfrag = mptcp_carve_data_frag(msk, pfrag, pfrag->offset);
1818d9ca1de8SPaolo Abeni frag_truesize = dfrag->overhead;
1819fb529e62SFlorian Westphal }
1820fb529e62SFlorian Westphal
1821d9ca1de8SPaolo Abeni /* we do not bound vs wspace, to allow a single packet.
1822d9ca1de8SPaolo Abeni * memory accounting will prevent execessive memory usage
1823d9ca1de8SPaolo Abeni * anyway
1824d9ca1de8SPaolo Abeni */
1825d9ca1de8SPaolo Abeni offset = dfrag->offset + dfrag->data_len;
1826d9ca1de8SPaolo Abeni psize = pfrag->size - offset;
1827d9ca1de8SPaolo Abeni psize = min_t(size_t, psize, msg_data_left(msg));
1828724cfd2eSPaolo Abeni total_ts = psize + frag_truesize;
18298ce568edSPaolo Abeni
18306511882cSPaolo Abeni if (!sk_wmem_schedule(sk, total_ts))
1831d9ca1de8SPaolo Abeni goto wait_for_memory;
1832d9ca1de8SPaolo Abeni
1833d9ca1de8SPaolo Abeni if (copy_page_from_iter(dfrag->page, offset, psize,
1834d9ca1de8SPaolo Abeni &msg->msg_iter) != psize) {
1835d9ca1de8SPaolo Abeni ret = -EFAULT;
183669800e51SPaolo Abeni goto do_error;
1837d9ca1de8SPaolo Abeni }
1838d9ca1de8SPaolo Abeni
1839d9ca1de8SPaolo Abeni /* data successfully copied into the write queue */
18405e6300e7SEric Dumazet sk_forward_alloc_add(sk, -total_ts);
1841d9ca1de8SPaolo Abeni copied += psize;
1842d9ca1de8SPaolo Abeni dfrag->data_len += psize;
1843d9ca1de8SPaolo Abeni frag_truesize += psize;
1844d9ca1de8SPaolo Abeni pfrag->offset += frag_truesize;
1845d9ca1de8SPaolo Abeni WRITE_ONCE(msk->write_seq, msk->write_seq + psize);
1846d9ca1de8SPaolo Abeni
1847d9ca1de8SPaolo Abeni /* charge data on mptcp pending queue to the msk socket
1848d9ca1de8SPaolo Abeni * Note: we charge such data both to sk and ssk
1849d9ca1de8SPaolo Abeni */
1850d9ca1de8SPaolo Abeni sk_wmem_queued_add(sk, frag_truesize);
1851d9ca1de8SPaolo Abeni if (!dfrag_collapsed) {
1852d9ca1de8SPaolo Abeni get_page(dfrag->page);
1853d9ca1de8SPaolo Abeni list_add_tail(&dfrag->list, &msk->rtx_queue);
1854d9ca1de8SPaolo Abeni if (!msk->first_pending)
1855d9ca1de8SPaolo Abeni WRITE_ONCE(msk->first_pending, dfrag);
1856d9ca1de8SPaolo Abeni }
1857e4b61351SGeliang Tang pr_debug("msk=%p dfrag at seq=%llu len=%u sent=%u new=%d", msk,
1858d9ca1de8SPaolo Abeni dfrag->data_seq, dfrag->data_len, dfrag->already_sent,
1859d9ca1de8SPaolo Abeni !dfrag_collapsed);
1860d9ca1de8SPaolo Abeni
1861d9ca1de8SPaolo Abeni continue;
1862d9ca1de8SPaolo Abeni
1863d9ca1de8SPaolo Abeni wait_for_memory:
18645cf92bbaSPaolo Abeni mptcp_set_nospace(sk);
1865c2e6048fSPaolo Abeni __mptcp_push_pending(sk, msg->msg_flags);
1866f296234cSPeter Krystad ret = sk_stream_wait_memory(sk, &timeo);
1867f296234cSPeter Krystad if (ret)
186869800e51SPaolo Abeni goto do_error;
1869cec37a6eSPeter Krystad }
1870cec37a6eSPeter Krystad
187113e16037SPaolo Abeni if (copied)
1872c2e6048fSPaolo Abeni __mptcp_push_pending(sk, msg->msg_flags);
1873da51aef5SPaolo Abeni
18741954b860SMat Martineau out:
1875cec37a6eSPeter Krystad release_sock(sk);
187669800e51SPaolo Abeni return copied;
187769800e51SPaolo Abeni
187869800e51SPaolo Abeni do_error:
187969800e51SPaolo Abeni if (copied)
188069800e51SPaolo Abeni goto out;
188169800e51SPaolo Abeni
188269800e51SPaolo Abeni copied = sk_stream_error(sk, msg->msg_flags, ret);
188369800e51SPaolo Abeni goto out;
1884f870fa0bSMat Martineau }
1885f870fa0bSMat Martineau
__mptcp_recvmsg_mskq(struct mptcp_sock * msk,struct msghdr * msg,size_t len,int flags,struct scm_timestamping_internal * tss,int * cmsg_flags)18866771bfd9SFlorian Westphal static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk,
18876771bfd9SFlorian Westphal struct msghdr *msg,
1888b7f653b2SFlorian Westphal size_t len, int flags,
1889b7f653b2SFlorian Westphal struct scm_timestamping_internal *tss,
1890b7f653b2SFlorian Westphal int *cmsg_flags)
18916771bfd9SFlorian Westphal {
1892ca4fb892SYonglong Li struct sk_buff *skb, *tmp;
18936771bfd9SFlorian Westphal int copied = 0;
18946771bfd9SFlorian Westphal
1895ca4fb892SYonglong Li skb_queue_walk_safe(&msk->receive_queue, skb, tmp) {
18966771bfd9SFlorian Westphal u32 offset = MPTCP_SKB_CB(skb)->offset;
18976771bfd9SFlorian Westphal u32 data_len = skb->len - offset;
18986771bfd9SFlorian Westphal u32 count = min_t(size_t, len - copied, data_len);
18996771bfd9SFlorian Westphal int err;
19006771bfd9SFlorian Westphal
1901d976092cSPaolo Abeni if (!(flags & MSG_TRUNC)) {
19026771bfd9SFlorian Westphal err = skb_copy_datagram_msg(skb, offset, msg, count);
19036771bfd9SFlorian Westphal if (unlikely(err < 0)) {
19046771bfd9SFlorian Westphal if (!copied)
19056771bfd9SFlorian Westphal return err;
19066771bfd9SFlorian Westphal break;
19076771bfd9SFlorian Westphal }
1908d976092cSPaolo Abeni }
19096771bfd9SFlorian Westphal
1910b7f653b2SFlorian Westphal if (MPTCP_SKB_CB(skb)->has_rxtstamp) {
1911b7f653b2SFlorian Westphal tcp_update_recv_tstamps(skb, tss);
1912b7f653b2SFlorian Westphal *cmsg_flags |= MPTCP_CMSG_TS;
1913b7f653b2SFlorian Westphal }
1914b7f653b2SFlorian Westphal
19156771bfd9SFlorian Westphal copied += count;
19166771bfd9SFlorian Westphal
19176771bfd9SFlorian Westphal if (count < data_len) {
19182c9e7765SFlorian Westphal if (!(flags & MSG_PEEK)) {
19196771bfd9SFlorian Westphal MPTCP_SKB_CB(skb)->offset += count;
19202c9e7765SFlorian Westphal MPTCP_SKB_CB(skb)->map_seq += count;
19212c9e7765SFlorian Westphal }
19226771bfd9SFlorian Westphal break;
19236771bfd9SFlorian Westphal }
19246771bfd9SFlorian Westphal
1925ca4fb892SYonglong Li if (!(flags & MSG_PEEK)) {
192687952603SPaolo Abeni /* we will bulk release the skb memory later */
192787952603SPaolo Abeni skb->destructor = NULL;
1928ce599c51SPaolo Abeni WRITE_ONCE(msk->rmem_released, msk->rmem_released + skb->truesize);
192987952603SPaolo Abeni __skb_unlink(skb, &msk->receive_queue);
19306771bfd9SFlorian Westphal __kfree_skb(skb);
1931ca4fb892SYonglong Li }
19326771bfd9SFlorian Westphal
19336771bfd9SFlorian Westphal if (copied >= len)
19346771bfd9SFlorian Westphal break;
19356771bfd9SFlorian Westphal }
19366771bfd9SFlorian Westphal
19376771bfd9SFlorian Westphal return copied;
19386771bfd9SFlorian Westphal }
19396771bfd9SFlorian Westphal
1940a6b118feSFlorian Westphal /* receive buffer autotuning. See tcp_rcv_space_adjust for more information.
1941a6b118feSFlorian Westphal *
1942a6b118feSFlorian Westphal * Only difference: Use highest rtt estimate of the subflows in use.
1943a6b118feSFlorian Westphal */
mptcp_rcv_space_adjust(struct mptcp_sock * msk,int copied)1944a6b118feSFlorian Westphal static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied)
1945a6b118feSFlorian Westphal {
1946a6b118feSFlorian Westphal struct mptcp_subflow_context *subflow;
1947a6b118feSFlorian Westphal struct sock *sk = (struct sock *)msk;
1948b8dc6d6cSPaolo Abeni u8 scaling_ratio = U8_MAX;
1949a6b118feSFlorian Westphal u32 time, advmss = 1;
1950a6b118feSFlorian Westphal u64 rtt_us, mstamp;
1951a6b118feSFlorian Westphal
1952109cdeb8SGeliang Tang msk_owned_by_me(msk);
1953a6b118feSFlorian Westphal
1954a6b118feSFlorian Westphal if (copied <= 0)
1955a6b118feSFlorian Westphal return;
1956a6b118feSFlorian Westphal
1957a2d74374SPaolo Abeni if (!msk->rcvspace_init)
1958a2d74374SPaolo Abeni mptcp_rcv_space_init(msk, msk->first);
1959a2d74374SPaolo Abeni
1960a6b118feSFlorian Westphal msk->rcvq_space.copied += copied;
1961a6b118feSFlorian Westphal
1962a6b118feSFlorian Westphal mstamp = div_u64(tcp_clock_ns(), NSEC_PER_USEC);
1963a6b118feSFlorian Westphal time = tcp_stamp_us_delta(mstamp, msk->rcvq_space.time);
1964a6b118feSFlorian Westphal
1965a6b118feSFlorian Westphal rtt_us = msk->rcvq_space.rtt_us;
1966a6b118feSFlorian Westphal if (rtt_us && time < (rtt_us >> 3))
1967a6b118feSFlorian Westphal return;
1968a6b118feSFlorian Westphal
1969a6b118feSFlorian Westphal rtt_us = 0;
1970a6b118feSFlorian Westphal mptcp_for_each_subflow(msk, subflow) {
1971a6b118feSFlorian Westphal const struct tcp_sock *tp;
1972a6b118feSFlorian Westphal u64 sf_rtt_us;
1973a6b118feSFlorian Westphal u32 sf_advmss;
1974a6b118feSFlorian Westphal
1975a6b118feSFlorian Westphal tp = tcp_sk(mptcp_subflow_tcp_sock(subflow));
1976a6b118feSFlorian Westphal
1977a6b118feSFlorian Westphal sf_rtt_us = READ_ONCE(tp->rcv_rtt_est.rtt_us);
1978a6b118feSFlorian Westphal sf_advmss = READ_ONCE(tp->advmss);
1979a6b118feSFlorian Westphal
1980a6b118feSFlorian Westphal rtt_us = max(sf_rtt_us, rtt_us);
1981a6b118feSFlorian Westphal advmss = max(sf_advmss, advmss);
1982b8dc6d6cSPaolo Abeni scaling_ratio = min(tp->scaling_ratio, scaling_ratio);
1983a6b118feSFlorian Westphal }
1984a6b118feSFlorian Westphal
1985a6b118feSFlorian Westphal msk->rcvq_space.rtt_us = rtt_us;
1986b8dc6d6cSPaolo Abeni msk->scaling_ratio = scaling_ratio;
1987a6b118feSFlorian Westphal if (time < (rtt_us >> 3) || rtt_us == 0)
1988a6b118feSFlorian Westphal return;
1989a6b118feSFlorian Westphal
1990a6b118feSFlorian Westphal if (msk->rcvq_space.copied <= msk->rcvq_space.space)
1991a6b118feSFlorian Westphal goto new_measure;
1992a6b118feSFlorian Westphal
199378047648SKuniyuki Iwashima if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf) &&
1994a6b118feSFlorian Westphal !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) {
1995a6b118feSFlorian Westphal u64 rcvwin, grow;
1996b8dc6d6cSPaolo Abeni int rcvbuf;
1997a6b118feSFlorian Westphal
1998a6b118feSFlorian Westphal rcvwin = ((u64)msk->rcvq_space.copied << 1) + 16 * advmss;
1999a6b118feSFlorian Westphal
2000a6b118feSFlorian Westphal grow = rcvwin * (msk->rcvq_space.copied - msk->rcvq_space.space);
2001a6b118feSFlorian Westphal
2002a6b118feSFlorian Westphal do_div(grow, msk->rcvq_space.space);
2003a6b118feSFlorian Westphal rcvwin += (grow << 1);
2004a6b118feSFlorian Westphal
2005b8dc6d6cSPaolo Abeni rcvbuf = min_t(u64, __tcp_space_from_win(scaling_ratio, rcvwin),
200602739545SKuniyuki Iwashima READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[2]));
2007a6b118feSFlorian Westphal
2008a6b118feSFlorian Westphal if (rcvbuf > sk->sk_rcvbuf) {
2009a6b118feSFlorian Westphal u32 window_clamp;
2010a6b118feSFlorian Westphal
2011b8dc6d6cSPaolo Abeni window_clamp = __tcp_win_from_space(scaling_ratio, rcvbuf);
2012a6b118feSFlorian Westphal WRITE_ONCE(sk->sk_rcvbuf, rcvbuf);
2013a6b118feSFlorian Westphal
2014a6b118feSFlorian Westphal /* Make subflows follow along. If we do not do this, we
2015a6b118feSFlorian Westphal * get drops at subflow level if skbs can't be moved to
2016a6b118feSFlorian Westphal * the mptcp rx queue fast enough (announced rcv_win can
2017a6b118feSFlorian Westphal * exceed ssk->sk_rcvbuf).
2018a6b118feSFlorian Westphal */
2019a6b118feSFlorian Westphal mptcp_for_each_subflow(msk, subflow) {
2020a6b118feSFlorian Westphal struct sock *ssk;
2021c76c6956SPaolo Abeni bool slow;
2022a6b118feSFlorian Westphal
2023a6b118feSFlorian Westphal ssk = mptcp_subflow_tcp_sock(subflow);
2024c76c6956SPaolo Abeni slow = lock_sock_fast(ssk);
2025a6b118feSFlorian Westphal WRITE_ONCE(ssk->sk_rcvbuf, rcvbuf);
2026a6b118feSFlorian Westphal tcp_sk(ssk)->window_clamp = window_clamp;
2027c76c6956SPaolo Abeni tcp_cleanup_rbuf(ssk, 1);
2028c76c6956SPaolo Abeni unlock_sock_fast(ssk, slow);
2029a6b118feSFlorian Westphal }
2030a6b118feSFlorian Westphal }
2031a6b118feSFlorian Westphal }
2032a6b118feSFlorian Westphal
2033a6b118feSFlorian Westphal msk->rcvq_space.space = msk->rcvq_space.copied;
2034a6b118feSFlorian Westphal new_measure:
2035a6b118feSFlorian Westphal msk->rcvq_space.copied = 0;
2036a6b118feSFlorian Westphal msk->rcvq_space.time = mstamp;
2037a6b118feSFlorian Westphal }
2038a6b118feSFlorian Westphal
__mptcp_update_rmem(struct sock * sk)203987952603SPaolo Abeni static void __mptcp_update_rmem(struct sock *sk)
204087952603SPaolo Abeni {
204187952603SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
204287952603SPaolo Abeni
204387952603SPaolo Abeni if (!msk->rmem_released)
204487952603SPaolo Abeni return;
204587952603SPaolo Abeni
204687952603SPaolo Abeni atomic_sub(msk->rmem_released, &sk->sk_rmem_alloc);
20476511882cSPaolo Abeni mptcp_rmem_uncharge(sk, msk->rmem_released);
2048ce599c51SPaolo Abeni WRITE_ONCE(msk->rmem_released, 0);
204987952603SPaolo Abeni }
205087952603SPaolo Abeni
__mptcp_splice_receive_queue(struct sock * sk)205187952603SPaolo Abeni static void __mptcp_splice_receive_queue(struct sock *sk)
205287952603SPaolo Abeni {
205387952603SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
205487952603SPaolo Abeni
205587952603SPaolo Abeni skb_queue_splice_tail_init(&sk->sk_receive_queue, &msk->receive_queue);
205687952603SPaolo Abeni }
205787952603SPaolo Abeni
__mptcp_move_skbs(struct mptcp_sock * msk)2058e3859603SPaolo Abeni static bool __mptcp_move_skbs(struct mptcp_sock *msk)
20596771bfd9SFlorian Westphal {
206087952603SPaolo Abeni struct sock *sk = (struct sock *)msk;
20616771bfd9SFlorian Westphal unsigned int moved = 0;
206287952603SPaolo Abeni bool ret, done;
2063d5f49190SPaolo Abeni
20646771bfd9SFlorian Westphal do {
20656771bfd9SFlorian Westphal struct sock *ssk = mptcp_subflow_recv_lookup(msk);
206665f49fe7SFlorian Westphal bool slowpath;
20676771bfd9SFlorian Westphal
206887952603SPaolo Abeni /* we can have data pending in the subflows only if the msk
206987952603SPaolo Abeni * receive buffer was full at subflow_data_ready() time,
207087952603SPaolo Abeni * that is an unlikely slow path.
207187952603SPaolo Abeni */
207287952603SPaolo Abeni if (likely(!ssk))
20736771bfd9SFlorian Westphal break;
20746771bfd9SFlorian Westphal
207565f49fe7SFlorian Westphal slowpath = lock_sock_fast(ssk);
207687952603SPaolo Abeni mptcp_data_lock(sk);
2077e3859603SPaolo Abeni __mptcp_update_rmem(sk);
20786771bfd9SFlorian Westphal done = __mptcp_move_skbs_from_subflow(msk, ssk, &moved);
207987952603SPaolo Abeni mptcp_data_unlock(sk);
2080499ada50SPaolo Abeni
2081499ada50SPaolo Abeni if (unlikely(ssk->sk_err))
2082499ada50SPaolo Abeni __mptcp_error_report(sk);
208365f49fe7SFlorian Westphal unlock_sock_fast(ssk, slowpath);
20846771bfd9SFlorian Westphal } while (!done);
20856771bfd9SFlorian Westphal
208687952603SPaolo Abeni /* acquire the data lock only if some input data is pending */
208787952603SPaolo Abeni ret = moved > 0;
208887952603SPaolo Abeni if (!RB_EMPTY_ROOT(&msk->out_of_order_queue) ||
208987952603SPaolo Abeni !skb_queue_empty_lockless(&sk->sk_receive_queue)) {
209087952603SPaolo Abeni mptcp_data_lock(sk);
209187952603SPaolo Abeni __mptcp_update_rmem(sk);
209287952603SPaolo Abeni ret |= __mptcp_ofo_queue(msk);
209387952603SPaolo Abeni __mptcp_splice_receive_queue(sk);
209487952603SPaolo Abeni mptcp_data_unlock(sk);
2095ab174ad8SPaolo Abeni }
209687952603SPaolo Abeni if (ret)
209787952603SPaolo Abeni mptcp_check_data_fin((struct sock *)msk);
209887952603SPaolo Abeni return !skb_queue_empty(&msk->receive_queue);
20996771bfd9SFlorian Westphal }
21006771bfd9SFlorian Westphal
mptcp_inq_hint(const struct sock * sk)21012c9e7765SFlorian Westphal static unsigned int mptcp_inq_hint(const struct sock *sk)
21022c9e7765SFlorian Westphal {
21032c9e7765SFlorian Westphal const struct mptcp_sock *msk = mptcp_sk(sk);
21042c9e7765SFlorian Westphal const struct sk_buff *skb;
21052c9e7765SFlorian Westphal
21062c9e7765SFlorian Westphal skb = skb_peek(&msk->receive_queue);
21072c9e7765SFlorian Westphal if (skb) {
21082c9e7765SFlorian Westphal u64 hint_val = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq;
21092c9e7765SFlorian Westphal
21102c9e7765SFlorian Westphal if (hint_val >= INT_MAX)
21112c9e7765SFlorian Westphal return INT_MAX;
21122c9e7765SFlorian Westphal
21132c9e7765SFlorian Westphal return (unsigned int)hint_val;
21142c9e7765SFlorian Westphal }
21152c9e7765SFlorian Westphal
21162c9e7765SFlorian Westphal if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN))
21172c9e7765SFlorian Westphal return 1;
21182c9e7765SFlorian Westphal
21192c9e7765SFlorian Westphal return 0;
21202c9e7765SFlorian Westphal }
21212c9e7765SFlorian Westphal
mptcp_recvmsg(struct sock * sk,struct msghdr * msg,size_t len,int flags,int * addr_len)2122f870fa0bSMat Martineau static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2123ec095263SOliver Hartkopp int flags, int *addr_len)
2124f870fa0bSMat Martineau {
2125f870fa0bSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk);
2126b7f653b2SFlorian Westphal struct scm_timestamping_internal tss;
2127b7f653b2SFlorian Westphal int copied = 0, cmsg_flags = 0;
21287a6a6cbcSPaolo Abeni int target;
21297a6a6cbcSPaolo Abeni long timeo;
2130f870fa0bSMat Martineau
2131cb9d80f4SPaolo Abeni /* MSG_ERRQUEUE is really a no-op till we support IP_RECVERR */
2132cb9d80f4SPaolo Abeni if (unlikely(flags & MSG_ERRQUEUE))
2133cb9d80f4SPaolo Abeni return inet_recv_error(sk, msg, len, addr_len);
2134cb9d80f4SPaolo Abeni
21356511882cSPaolo Abeni lock_sock(sk);
2136fd897679SPaolo Abeni if (unlikely(sk->sk_state == TCP_LISTEN)) {
2137fd897679SPaolo Abeni copied = -ENOTCONN;
2138fd897679SPaolo Abeni goto out_err;
2139fd897679SPaolo Abeni }
2140fd897679SPaolo Abeni
2141ec095263SOliver Hartkopp timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
21427a6a6cbcSPaolo Abeni
21437a6a6cbcSPaolo Abeni len = min_t(size_t, len, INT_MAX);
21447a6a6cbcSPaolo Abeni target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
21457a6a6cbcSPaolo Abeni
21462c9e7765SFlorian Westphal if (unlikely(msk->recvmsg_inq))
21472c9e7765SFlorian Westphal cmsg_flags = MPTCP_CMSG_INQ;
21482c9e7765SFlorian Westphal
214905e3eceaSEric Dumazet while (copied < len) {
2150e3859603SPaolo Abeni int bytes_read;
21517a6a6cbcSPaolo Abeni
2152b7f653b2SFlorian Westphal bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied, flags, &tss, &cmsg_flags);
21536771bfd9SFlorian Westphal if (unlikely(bytes_read < 0)) {
21547a6a6cbcSPaolo Abeni if (!copied)
21557a6a6cbcSPaolo Abeni copied = bytes_read;
21566771bfd9SFlorian Westphal goto out_err;
2157cec37a6eSPeter Krystad }
2158cec37a6eSPeter Krystad
21597a6a6cbcSPaolo Abeni copied += bytes_read;
21607a6a6cbcSPaolo Abeni
2161ea4ca586SPaolo Abeni /* be sure to advertise window change */
2162fd897679SPaolo Abeni mptcp_cleanup_rbuf(msk);
2163ea4ca586SPaolo Abeni
2164e3859603SPaolo Abeni if (skb_queue_empty(&msk->receive_queue) && __mptcp_move_skbs(msk))
2165e3859603SPaolo Abeni continue;
2166e3859603SPaolo Abeni
21677a6a6cbcSPaolo Abeni /* only the master socket status is relevant here. The exit
21687a6a6cbcSPaolo Abeni * conditions mirror closely tcp_recvmsg()
21697a6a6cbcSPaolo Abeni */
21707a6a6cbcSPaolo Abeni if (copied >= target)
21717a6a6cbcSPaolo Abeni break;
21727a6a6cbcSPaolo Abeni
21737a6a6cbcSPaolo Abeni if (copied) {
21747a6a6cbcSPaolo Abeni if (sk->sk_err ||
21757a6a6cbcSPaolo Abeni sk->sk_state == TCP_CLOSE ||
21767a6a6cbcSPaolo Abeni (sk->sk_shutdown & RCV_SHUTDOWN) ||
21777a6a6cbcSPaolo Abeni !timeo ||
21787a6a6cbcSPaolo Abeni signal_pending(current))
21797a6a6cbcSPaolo Abeni break;
21807a6a6cbcSPaolo Abeni } else {
21817a6a6cbcSPaolo Abeni if (sk->sk_err) {
21827a6a6cbcSPaolo Abeni copied = sock_error(sk);
21837a6a6cbcSPaolo Abeni break;
21847a6a6cbcSPaolo Abeni }
21857a6a6cbcSPaolo Abeni
218687952603SPaolo Abeni if (sk->sk_shutdown & RCV_SHUTDOWN) {
218787952603SPaolo Abeni /* race breaker: the shutdown could be after the
218887952603SPaolo Abeni * previous receive queue check
218987952603SPaolo Abeni */
2190e3859603SPaolo Abeni if (__mptcp_move_skbs(msk))
219187952603SPaolo Abeni continue;
21927a6a6cbcSPaolo Abeni break;
219387952603SPaolo Abeni }
21947a6a6cbcSPaolo Abeni
21957a6a6cbcSPaolo Abeni if (sk->sk_state == TCP_CLOSE) {
21967a6a6cbcSPaolo Abeni copied = -ENOTCONN;
21977a6a6cbcSPaolo Abeni break;
21987a6a6cbcSPaolo Abeni }
21997a6a6cbcSPaolo Abeni
22007a6a6cbcSPaolo Abeni if (!timeo) {
22017a6a6cbcSPaolo Abeni copied = -EAGAIN;
22027a6a6cbcSPaolo Abeni break;
22037a6a6cbcSPaolo Abeni }
22047a6a6cbcSPaolo Abeni
22057a6a6cbcSPaolo Abeni if (signal_pending(current)) {
22067a6a6cbcSPaolo Abeni copied = sock_intr_errno(timeo);
22077a6a6cbcSPaolo Abeni break;
22087a6a6cbcSPaolo Abeni }
22097a6a6cbcSPaolo Abeni }
22107a6a6cbcSPaolo Abeni
22117a6a6cbcSPaolo Abeni pr_debug("block timeout %ld", timeo);
2212612f71d7SPaolo Abeni sk_wait_data(sk, &timeo, NULL);
22137a6a6cbcSPaolo Abeni }
22143c90e377SPaolo Abeni
22156771bfd9SFlorian Westphal out_err:
2216b7f653b2SFlorian Westphal if (cmsg_flags && copied >= 0) {
2217b7f653b2SFlorian Westphal if (cmsg_flags & MPTCP_CMSG_TS)
2218b7f653b2SFlorian Westphal tcp_recv_timestamp(msg, sk, &tss);
22192c9e7765SFlorian Westphal
22202c9e7765SFlorian Westphal if (cmsg_flags & MPTCP_CMSG_INQ) {
22212c9e7765SFlorian Westphal unsigned int inq = mptcp_inq_hint(sk);
22222c9e7765SFlorian Westphal
22232c9e7765SFlorian Westphal put_cmsg(msg, SOL_TCP, TCP_CM_INQ, sizeof(inq), &inq);
22242c9e7765SFlorian Westphal }
2225b7f653b2SFlorian Westphal }
2226b7f653b2SFlorian Westphal
2227612f71d7SPaolo Abeni pr_debug("msk=%p rx queue empty=%d:%d copied=%d",
2228612f71d7SPaolo Abeni msk, skb_queue_empty_lockless(&sk->sk_receive_queue),
2229612f71d7SPaolo Abeni skb_queue_empty(&msk->receive_queue), copied);
2230ca4fb892SYonglong Li if (!(flags & MSG_PEEK))
2231a6b118feSFlorian Westphal mptcp_rcv_space_adjust(msk, copied);
2232a6b118feSFlorian Westphal
2233cec37a6eSPeter Krystad release_sock(sk);
2234cec37a6eSPeter Krystad return copied;
2235cec37a6eSPeter Krystad }
2236cec37a6eSPeter Krystad
mptcp_retransmit_timer(struct timer_list * t)2237b51f9b80SPaolo Abeni static void mptcp_retransmit_timer(struct timer_list *t)
2238b51f9b80SPaolo Abeni {
2239b51f9b80SPaolo Abeni struct inet_connection_sock *icsk = from_timer(icsk, t,
2240b51f9b80SPaolo Abeni icsk_retransmit_timer);
2241b51f9b80SPaolo Abeni struct sock *sk = &icsk->icsk_inet.sk;
22422d6f5a2bSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
2243b51f9b80SPaolo Abeni
2244b51f9b80SPaolo Abeni bh_lock_sock(sk);
2245b51f9b80SPaolo Abeni if (!sock_owned_by_user(sk)) {
22462d6f5a2bSPaolo Abeni /* we need a process context to retransmit */
22472d6f5a2bSPaolo Abeni if (!test_and_set_bit(MPTCP_WORK_RTX, &msk->flags))
22482d6f5a2bSPaolo Abeni mptcp_schedule_work(sk);
2249b51f9b80SPaolo Abeni } else {
2250b51f9b80SPaolo Abeni /* delegate our work to tcp_release_cb() */
2251e9d09bacSPaolo Abeni __set_bit(MPTCP_RETRANSMIT, &msk->cb_flags);
2252b51f9b80SPaolo Abeni }
2253b51f9b80SPaolo Abeni bh_unlock_sock(sk);
2254b51f9b80SPaolo Abeni sock_put(sk);
2255b51f9b80SPaolo Abeni }
2256b51f9b80SPaolo Abeni
mptcp_tout_timer(struct timer_list * t)2257f6909dc1SPaolo Abeni static void mptcp_tout_timer(struct timer_list *t)
2258e16163b6SPaolo Abeni {
2259e16163b6SPaolo Abeni struct sock *sk = from_timer(sk, t, sk_timer);
2260e16163b6SPaolo Abeni
2261e16163b6SPaolo Abeni mptcp_schedule_work(sk);
2262b6d69fc8SFlorian Westphal sock_put(sk);
2263e16163b6SPaolo Abeni }
2264e16163b6SPaolo Abeni
22653b1d6210SPaolo Abeni /* Find an idle subflow. Return NULL if there is unacked data at tcp
22663b1d6210SPaolo Abeni * level.
22673b1d6210SPaolo Abeni *
22683b1d6210SPaolo Abeni * A backup subflow is returned only if that is the only kind available.
22693b1d6210SPaolo Abeni */
mptcp_subflow_get_retrans(struct mptcp_sock * msk)227007336a87SGeliang Tang struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk)
22713b1d6210SPaolo Abeni {
227271b7dec2SPaolo Abeni struct sock *backup = NULL, *pick = NULL;
22733b1d6210SPaolo Abeni struct mptcp_subflow_context *subflow;
227471b7dec2SPaolo Abeni int min_stale_count = INT_MAX;
22753b1d6210SPaolo Abeni
22763b1d6210SPaolo Abeni mptcp_for_each_subflow(msk, subflow) {
22773b1d6210SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
22783b1d6210SPaolo Abeni
2279ff5a0b42SPaolo Abeni if (!__mptcp_subflow_active(subflow))
2280d5f49190SPaolo Abeni continue;
2281d5f49190SPaolo Abeni
228271b7dec2SPaolo Abeni /* still data outstanding at TCP level? skip this */
228371b7dec2SPaolo Abeni if (!tcp_rtx_and_write_queues_empty(ssk)) {
228471b7dec2SPaolo Abeni mptcp_pm_subflow_chk_stale(msk, ssk);
228571b7dec2SPaolo Abeni min_stale_count = min_t(int, min_stale_count, subflow->stale_count);
2286860975c6SFlorian Westphal continue;
2287860975c6SFlorian Westphal }
22883b1d6210SPaolo Abeni
22893b1d6210SPaolo Abeni if (subflow->backup) {
22903b1d6210SPaolo Abeni if (!backup)
22913b1d6210SPaolo Abeni backup = ssk;
22923b1d6210SPaolo Abeni continue;
22933b1d6210SPaolo Abeni }
22943b1d6210SPaolo Abeni
229571b7dec2SPaolo Abeni if (!pick)
229671b7dec2SPaolo Abeni pick = ssk;
22973b1d6210SPaolo Abeni }
22983b1d6210SPaolo Abeni
229971b7dec2SPaolo Abeni if (pick)
230071b7dec2SPaolo Abeni return pick;
230171b7dec2SPaolo Abeni
230271b7dec2SPaolo Abeni /* use backup only if there are no progresses anywhere */
230371b7dec2SPaolo Abeni return min_stale_count > 1 ? backup : NULL;
23043b1d6210SPaolo Abeni }
23053b1d6210SPaolo Abeni
__mptcp_retransmit_pending_data(struct sock * sk)23061e1d9d6fSPaolo Abeni bool __mptcp_retransmit_pending_data(struct sock *sk)
23071e1d9d6fSPaolo Abeni {
23081e1d9d6fSPaolo Abeni struct mptcp_data_frag *cur, *rtx_head;
23091e1d9d6fSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
23101e1d9d6fSPaolo Abeni
231100df24f1SGeliang Tang if (__mptcp_check_fallback(msk))
23121e1d9d6fSPaolo Abeni return false;
23131e1d9d6fSPaolo Abeni
23141e1d9d6fSPaolo Abeni /* the closing socket has some data untransmitted and/or unacked:
23151e1d9d6fSPaolo Abeni * some data in the mptcp rtx queue has not really xmitted yet.
23161e1d9d6fSPaolo Abeni * keep it simple and re-inject the whole mptcp level rtx queue
23171e1d9d6fSPaolo Abeni */
23181e1d9d6fSPaolo Abeni mptcp_data_lock(sk);
23191e1d9d6fSPaolo Abeni __mptcp_clean_una_wakeup(sk);
23201e1d9d6fSPaolo Abeni rtx_head = mptcp_rtx_head(sk);
23211e1d9d6fSPaolo Abeni if (!rtx_head) {
23221e1d9d6fSPaolo Abeni mptcp_data_unlock(sk);
23231e1d9d6fSPaolo Abeni return false;
23241e1d9d6fSPaolo Abeni }
23251e1d9d6fSPaolo Abeni
23261e1d9d6fSPaolo Abeni msk->recovery_snd_nxt = msk->snd_nxt;
23271e1d9d6fSPaolo Abeni msk->recovery = true;
23281e1d9d6fSPaolo Abeni mptcp_data_unlock(sk);
23291e1d9d6fSPaolo Abeni
23301e1d9d6fSPaolo Abeni msk->first_pending = rtx_head;
23311e1d9d6fSPaolo Abeni msk->snd_burst = 0;
23321e1d9d6fSPaolo Abeni
23331e1d9d6fSPaolo Abeni /* be sure to clear the "sent status" on all re-injected fragments */
23341e1d9d6fSPaolo Abeni list_for_each_entry(cur, &msk->rtx_queue, list) {
23351e1d9d6fSPaolo Abeni if (!cur->already_sent)
23361e1d9d6fSPaolo Abeni break;
23371e1d9d6fSPaolo Abeni cur->already_sent = 0;
23381e1d9d6fSPaolo Abeni }
23391e1d9d6fSPaolo Abeni
23401e1d9d6fSPaolo Abeni return true;
23411e1d9d6fSPaolo Abeni }
23421e1d9d6fSPaolo Abeni
2343b29fcfb5SPaolo Abeni /* flags for __mptcp_close_ssk() */
2344b29fcfb5SPaolo Abeni #define MPTCP_CF_PUSH BIT(1)
2345b29fcfb5SPaolo Abeni #define MPTCP_CF_FASTCLOSE BIT(2)
2346b29fcfb5SPaolo Abeni
234714c56686SGeliang Tang /* be sure to send a reset only if the caller asked for it, also
234814c56686SGeliang Tang * clean completely the subflow status when the subflow reaches
234914c56686SGeliang Tang * TCP_CLOSE state
235014c56686SGeliang Tang */
__mptcp_subflow_disconnect(struct sock * ssk,struct mptcp_subflow_context * subflow,unsigned int flags)235114c56686SGeliang Tang static void __mptcp_subflow_disconnect(struct sock *ssk,
235214c56686SGeliang Tang struct mptcp_subflow_context *subflow,
235314c56686SGeliang Tang unsigned int flags)
235414c56686SGeliang Tang {
235514c56686SGeliang Tang if (((1 << ssk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)) ||
235614c56686SGeliang Tang (flags & MPTCP_CF_FASTCLOSE)) {
235714c56686SGeliang Tang /* The MPTCP code never wait on the subflow sockets, TCP-level
235814c56686SGeliang Tang * disconnect should never fail
235914c56686SGeliang Tang */
236014c56686SGeliang Tang WARN_ON_ONCE(tcp_disconnect(ssk, 0));
236114c56686SGeliang Tang mptcp_subflow_ctx_reset(subflow);
236214c56686SGeliang Tang } else {
236314c56686SGeliang Tang tcp_shutdown(ssk, SEND_SHUTDOWN);
236414c56686SGeliang Tang }
236514c56686SGeliang Tang }
236614c56686SGeliang Tang
2367cec37a6eSPeter Krystad /* subflow sockets can be either outgoing (connect) or incoming
2368cec37a6eSPeter Krystad * (accept).
2369cec37a6eSPeter Krystad *
2370cec37a6eSPeter Krystad * Outgoing subflows use in-kernel sockets.
2371cec37a6eSPeter Krystad * Incoming subflows do not have their own 'struct socket' allocated,
2372cec37a6eSPeter Krystad * so we need to use tcp_close() after detaching them from the mptcp
2373cec37a6eSPeter Krystad * parent socket.
2374cec37a6eSPeter Krystad */
__mptcp_close_ssk(struct sock * sk,struct sock * ssk,struct mptcp_subflow_context * subflow,unsigned int flags)2375a141e02eSFlorian Westphal static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
2376b29fcfb5SPaolo Abeni struct mptcp_subflow_context *subflow,
2377b29fcfb5SPaolo Abeni unsigned int flags)
2378cec37a6eSPeter Krystad {
2379e0be4931SFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk);
238063740448SPaolo Abeni bool dispose_it, need_push = false;
238163740448SPaolo Abeni
238263740448SPaolo Abeni /* If the first subflow moved to a close state before accept, e.g. due
238327e5ccc2SPaolo Abeni * to an incoming reset or listener shutdown, the subflow socket is
238427e5ccc2SPaolo Abeni * already deleted by inet_child_forget() and the mptcp socket can't
238527e5ccc2SPaolo Abeni * survive too.
238663740448SPaolo Abeni */
238727e5ccc2SPaolo Abeni if (msk->in_accept_queue && msk->first == ssk &&
238827e5ccc2SPaolo Abeni (sock_flag(sk, SOCK_DEAD) || sock_flag(ssk, SOCK_DEAD))) {
238963740448SPaolo Abeni /* ensure later check in mptcp_worker() will dispose the msk */
239027e5ccc2SPaolo Abeni mptcp_set_close_tout(sk, tcp_jiffies32 - (TCP_TIMEWAIT_LEN + 1));
239163740448SPaolo Abeni sock_set_flag(sk, SOCK_DEAD);
239263740448SPaolo Abeni lock_sock_nested(ssk, SINGLE_DEPTH_NESTING);
239363740448SPaolo Abeni mptcp_subflow_drop_ctx(ssk);
239463740448SPaolo Abeni goto out_release;
239563740448SPaolo Abeni }
2396e0be4931SFlorian Westphal
239739880bd8SPaolo Abeni dispose_it = msk->free_first || ssk != msk->first;
2398b29fcfb5SPaolo Abeni if (dispose_it)
2399cec37a6eSPeter Krystad list_del(&subflow->node);
2400cec37a6eSPeter Krystad
24013f8b2667SPaolo Abeni lock_sock_nested(ssk, SINGLE_DEPTH_NESTING);
2402e16163b6SPaolo Abeni
2403ff18f9efSPaolo Abeni if ((flags & MPTCP_CF_FASTCLOSE) && !__mptcp_check_fallback(msk)) {
240414c56686SGeliang Tang /* be sure to force the tcp_close path
2405d21f8348SPaolo Abeni * to generate the egress reset
2406d21f8348SPaolo Abeni */
2407d21f8348SPaolo Abeni ssk->sk_lingertime = 0;
2408d21f8348SPaolo Abeni sock_set_flag(ssk, SOCK_LINGER);
2409b29fcfb5SPaolo Abeni subflow->send_fastclose = 1;
2410d21f8348SPaolo Abeni }
2411b29fcfb5SPaolo Abeni
2412b29fcfb5SPaolo Abeni need_push = (flags & MPTCP_CF_PUSH) && __mptcp_retransmit_pending_data(sk);
2413b29fcfb5SPaolo Abeni if (!dispose_it) {
241414c56686SGeliang Tang __mptcp_subflow_disconnect(ssk, subflow, flags);
2415b29fcfb5SPaolo Abeni release_sock(ssk);
2416b29fcfb5SPaolo Abeni
2417b29fcfb5SPaolo Abeni goto out;
2418b29fcfb5SPaolo Abeni }
2419b29fcfb5SPaolo Abeni
2420d7b1bfd0SPaolo Abeni subflow->disposable = 1;
2421d7b1bfd0SPaolo Abeni
2422e16163b6SPaolo Abeni /* if ssk hit tcp_done(), tcp_cleanup_ulp() cleared the related ops
2423e16163b6SPaolo Abeni * the ssk has been already destroyed, we just need to release the
2424e16163b6SPaolo Abeni * reference owned by msk;
2425e16163b6SPaolo Abeni */
2426e16163b6SPaolo Abeni if (!inet_csk(ssk)->icsk_ulp_ops) {
2427b6985b9bSPaolo Abeni WARN_ON_ONCE(!sock_flag(ssk, SOCK_DEAD));
2428e16163b6SPaolo Abeni kfree_rcu(subflow, rcu);
2429e16163b6SPaolo Abeni } else {
2430d7b1bfd0SPaolo Abeni /* otherwise tcp will dispose of the ssk and subflow ctx */
2431e16163b6SPaolo Abeni __tcp_close(ssk, 0);
2432e16163b6SPaolo Abeni
2433e16163b6SPaolo Abeni /* close acquired an extra ref */
2434e16163b6SPaolo Abeni __sock_put(ssk);
2435e16163b6SPaolo Abeni }
243663740448SPaolo Abeni
243763740448SPaolo Abeni out_release:
24389f1a9881SPaolo Abeni __mptcp_subflow_error_report(sk, ssk);
2439e16163b6SPaolo Abeni release_sock(ssk);
2440e16163b6SPaolo Abeni
2441e16163b6SPaolo Abeni sock_put(ssk);
2442e0be4931SFlorian Westphal
2443c8fe62f0SFlorian Westphal if (ssk == msk->first)
24441b1b43eeSPaolo Abeni WRITE_ONCE(msk->first, NULL);
2445c8fe62f0SFlorian Westphal
2446b29fcfb5SPaolo Abeni out:
244734c7757aSPaolo Abeni __mptcp_sync_sndbuf(sk);
24481e1d9d6fSPaolo Abeni if (need_push)
24491e1d9d6fSPaolo Abeni __mptcp_push_pending(sk, 0);
245027e5ccc2SPaolo Abeni
245127e5ccc2SPaolo Abeni /* Catch every 'all subflows closed' scenario, including peers silently
245227e5ccc2SPaolo Abeni * closing them, e.g. due to timeout.
245327e5ccc2SPaolo Abeni * For established sockets, allow an additional timeout before closing,
245427e5ccc2SPaolo Abeni * as the protocol can still create more subflows.
245527e5ccc2SPaolo Abeni */
245627e5ccc2SPaolo Abeni if (list_is_singular(&msk->conn_list) && msk->first &&
245727e5ccc2SPaolo Abeni inet_sk_state_load(msk->first) == TCP_CLOSE) {
245827e5ccc2SPaolo Abeni if (sk->sk_state != TCP_ESTABLISHED ||
245927e5ccc2SPaolo Abeni msk->in_accept_queue || sock_flag(sk, SOCK_DEAD)) {
2460d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
246127e5ccc2SPaolo Abeni mptcp_close_wake_up(sk);
246227e5ccc2SPaolo Abeni } else {
246327e5ccc2SPaolo Abeni mptcp_start_tout_timer(sk);
246427e5ccc2SPaolo Abeni }
246527e5ccc2SPaolo Abeni }
2466f870fa0bSMat Martineau }
2467f870fa0bSMat Martineau
mptcp_close_ssk(struct sock * sk,struct sock * ssk,struct mptcp_subflow_context * subflow)2468a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
2469a141e02eSFlorian Westphal struct mptcp_subflow_context *subflow)
2470a141e02eSFlorian Westphal {
2471b911c97cSFlorian Westphal if (sk->sk_state == TCP_ESTABLISHED)
2472b911c97cSFlorian Westphal mptcp_event(MPTCP_EVENT_SUB_CLOSED, mptcp_sk(sk), ssk, GFP_KERNEL);
2473a88c9e49SPaolo Abeni
2474a88c9e49SPaolo Abeni /* subflow aborted before reaching the fully_established status
2475a88c9e49SPaolo Abeni * attempt the creation of the next subflow
2476a88c9e49SPaolo Abeni */
2477a88c9e49SPaolo Abeni mptcp_pm_subflow_check_next(mptcp_sk(sk), ssk, subflow);
2478a88c9e49SPaolo Abeni
2479b29fcfb5SPaolo Abeni __mptcp_close_ssk(sk, ssk, subflow, MPTCP_CF_PUSH);
2480a141e02eSFlorian Westphal }
2481a141e02eSFlorian Westphal
mptcp_sync_mss(struct sock * sk,u32 pmtu)2482dc24f8b4SPaolo Abeni static unsigned int mptcp_sync_mss(struct sock *sk, u32 pmtu)
2483dc24f8b4SPaolo Abeni {
2484dc24f8b4SPaolo Abeni return 0;
2485dc24f8b4SPaolo Abeni }
2486dc24f8b4SPaolo Abeni
__mptcp_close_subflow(struct sock * sk)2487b6985b9bSPaolo Abeni static void __mptcp_close_subflow(struct sock *sk)
24880e4f35d7SPaolo Abeni {
24890e4f35d7SPaolo Abeni struct mptcp_subflow_context *subflow, *tmp;
2490b6985b9bSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
24910e4f35d7SPaolo Abeni
24923abc05d9SFlorian Westphal might_sleep();
24933abc05d9SFlorian Westphal
24945efbf6f7SMatthieu Baerts mptcp_for_each_subflow_safe(msk, subflow, tmp) {
24950e4f35d7SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
24960e4f35d7SPaolo Abeni
24970e4f35d7SPaolo Abeni if (inet_sk_state_load(ssk) != TCP_CLOSE)
24980e4f35d7SPaolo Abeni continue;
24990e4f35d7SPaolo Abeni
250040947e13SFlorian Westphal /* 'subflow_data_ready' will re-sched once rx queue is empty */
250140947e13SFlorian Westphal if (!skb_queue_empty_lockless(&ssk->sk_receive_queue))
250240947e13SFlorian Westphal continue;
250340947e13SFlorian Westphal
2504b6985b9bSPaolo Abeni mptcp_close_ssk(sk, ssk, subflow);
2505b6985b9bSPaolo Abeni }
2506b6985b9bSPaolo Abeni
25070e4f35d7SPaolo Abeni }
25080e4f35d7SPaolo Abeni
mptcp_close_tout_expired(const struct sock * sk)250927e5ccc2SPaolo Abeni static bool mptcp_close_tout_expired(const struct sock *sk)
2510e16163b6SPaolo Abeni {
251127e5ccc2SPaolo Abeni if (!inet_csk(sk)->icsk_mtup.probe_timestamp ||
251227e5ccc2SPaolo Abeni sk->sk_state == TCP_CLOSE)
2513e16163b6SPaolo Abeni return false;
251427e5ccc2SPaolo Abeni
251527e5ccc2SPaolo Abeni return time_after32(tcp_jiffies32,
251627e5ccc2SPaolo Abeni inet_csk(sk)->icsk_mtup.probe_timestamp + TCP_TIMEWAIT_LEN);
2517e16163b6SPaolo Abeni }
2518e16163b6SPaolo Abeni
mptcp_check_fastclose(struct mptcp_sock * msk)251950c504a2SFlorian Westphal static void mptcp_check_fastclose(struct mptcp_sock *msk)
252050c504a2SFlorian Westphal {
252150c504a2SFlorian Westphal struct mptcp_subflow_context *subflow, *tmp;
252280638684SGeliang Tang struct sock *sk = (struct sock *)msk;
252350c504a2SFlorian Westphal
252450c504a2SFlorian Westphal if (likely(!READ_ONCE(msk->rcv_fastclose)))
252550c504a2SFlorian Westphal return;
252650c504a2SFlorian Westphal
252750c504a2SFlorian Westphal mptcp_token_destroy(msk);
252850c504a2SFlorian Westphal
25295efbf6f7SMatthieu Baerts mptcp_for_each_subflow_safe(msk, subflow, tmp) {
253050c504a2SFlorian Westphal struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow);
253175e908c3SPaolo Abeni bool slow;
253250c504a2SFlorian Westphal
253375e908c3SPaolo Abeni slow = lock_sock_fast(tcp_sk);
253450c504a2SFlorian Westphal if (tcp_sk->sk_state != TCP_CLOSE) {
253550c504a2SFlorian Westphal tcp_send_active_reset(tcp_sk, GFP_ATOMIC);
253650c504a2SFlorian Westphal tcp_set_state(tcp_sk, TCP_CLOSE);
253750c504a2SFlorian Westphal }
253875e908c3SPaolo Abeni unlock_sock_fast(tcp_sk, slow);
253950c504a2SFlorian Westphal }
254050c504a2SFlorian Westphal
254169800e51SPaolo Abeni /* Mirror the tcp_reset() error propagation */
254269800e51SPaolo Abeni switch (sk->sk_state) {
254369800e51SPaolo Abeni case TCP_SYN_SENT:
25449ae8e5adSEric Dumazet WRITE_ONCE(sk->sk_err, ECONNREFUSED);
254569800e51SPaolo Abeni break;
254669800e51SPaolo Abeni case TCP_CLOSE_WAIT:
25479ae8e5adSEric Dumazet WRITE_ONCE(sk->sk_err, EPIPE);
254869800e51SPaolo Abeni break;
254969800e51SPaolo Abeni case TCP_CLOSE:
255069800e51SPaolo Abeni return;
255169800e51SPaolo Abeni default:
25529ae8e5adSEric Dumazet WRITE_ONCE(sk->sk_err, ECONNRESET);
255369800e51SPaolo Abeni }
255469800e51SPaolo Abeni
2555d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
25566b9831bfSPaolo Abeni WRITE_ONCE(sk->sk_shutdown, SHUTDOWN_MASK);
255750c504a2SFlorian Westphal smp_mb__before_atomic(); /* SHUTDOWN must be visible first */
255850c504a2SFlorian Westphal set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags);
255950c504a2SFlorian Westphal
256069800e51SPaolo Abeni /* the calling mptcp_worker will properly destroy the socket */
256169800e51SPaolo Abeni if (sock_flag(sk, SOCK_DEAD))
256269800e51SPaolo Abeni return;
256369800e51SPaolo Abeni
256469800e51SPaolo Abeni sk->sk_state_change(sk);
256569800e51SPaolo Abeni sk_error_report(sk);
256650c504a2SFlorian Westphal }
256750c504a2SFlorian Westphal
__mptcp_retrans(struct sock * sk)25682948d0a1SPaolo Abeni static void __mptcp_retrans(struct sock *sk)
256980992017SPaolo Abeni {
25702948d0a1SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
2571ee2708aeSGeliang Tang struct mptcp_subflow_context *subflow;
2572caf971dfSPaolo Abeni struct mptcp_sendmsg_info info = {};
25733b1d6210SPaolo Abeni struct mptcp_data_frag *dfrag;
25742948d0a1SPaolo Abeni struct sock *ssk;
2575ee2708aeSGeliang Tang int ret, err;
2576ee2708aeSGeliang Tang u16 len = 0;
25772948d0a1SPaolo Abeni
2578b5941f06SPaolo Abeni mptcp_clean_una_wakeup(sk);
25793241a9c0SFlorian Westphal
25803241a9c0SFlorian Westphal /* first check ssk: need to kick "stale" logic */
2581ee2708aeSGeliang Tang err = mptcp_sched_get_retrans(msk);
25822948d0a1SPaolo Abeni dfrag = mptcp_rtx_head(sk);
25836477dd39SMat Martineau if (!dfrag) {
25846477dd39SMat Martineau if (mptcp_data_fin_enabled(msk)) {
25856477dd39SMat Martineau struct inet_connection_sock *icsk = inet_csk(sk);
25866477dd39SMat Martineau
25876477dd39SMat Martineau icsk->icsk_retransmits++;
25886477dd39SMat Martineau mptcp_set_datafin_timeout(sk);
25896477dd39SMat Martineau mptcp_send_ack(msk);
25906477dd39SMat Martineau
25916477dd39SMat Martineau goto reset_timer;
25926477dd39SMat Martineau }
25936477dd39SMat Martineau
25943241a9c0SFlorian Westphal if (!mptcp_send_head(sk))
25952948d0a1SPaolo Abeni return;
25963241a9c0SFlorian Westphal
25973241a9c0SFlorian Westphal goto reset_timer;
25986477dd39SMat Martineau }
25992948d0a1SPaolo Abeni
2600ee2708aeSGeliang Tang if (err)
26012948d0a1SPaolo Abeni goto reset_timer;
26022948d0a1SPaolo Abeni
2603ee2708aeSGeliang Tang mptcp_for_each_subflow(msk, subflow) {
2604ee2708aeSGeliang Tang if (READ_ONCE(subflow->scheduled)) {
2605ee2708aeSGeliang Tang u16 copied = 0;
2606ee2708aeSGeliang Tang
2607ee2708aeSGeliang Tang mptcp_subflow_set_scheduled(subflow, false);
2608ee2708aeSGeliang Tang
2609ee2708aeSGeliang Tang ssk = mptcp_subflow_tcp_sock(subflow);
2610ee2708aeSGeliang Tang
26112948d0a1SPaolo Abeni lock_sock(ssk);
26122948d0a1SPaolo Abeni
26132948d0a1SPaolo Abeni /* limit retransmission to the bytes already sent on some subflows */
26142948d0a1SPaolo Abeni info.sent = 0;
2615ee2708aeSGeliang Tang info.limit = READ_ONCE(msk->csum_enabled) ? dfrag->data_len :
2616ee2708aeSGeliang Tang dfrag->already_sent;
26174e14867dSPaolo Abeni while (info.sent < info.limit) {
26182948d0a1SPaolo Abeni ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info);
26192948d0a1SPaolo Abeni if (ret <= 0)
26202948d0a1SPaolo Abeni break;
26212948d0a1SPaolo Abeni
26222948d0a1SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RETRANSSEGS);
26232948d0a1SPaolo Abeni copied += ret;
26242948d0a1SPaolo Abeni info.sent += ret;
26252948d0a1SPaolo Abeni }
26264e14867dSPaolo Abeni if (copied) {
2627ee2708aeSGeliang Tang len = max(copied, len);
26282948d0a1SPaolo Abeni tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle,
26292948d0a1SPaolo Abeni info.size_goal);
26300530020aSGeliang Tang WRITE_ONCE(msk->allow_infinite_fallback, false);
26314e14867dSPaolo Abeni }
26322948d0a1SPaolo Abeni
26332948d0a1SPaolo Abeni release_sock(ssk);
2634ee2708aeSGeliang Tang }
2635ee2708aeSGeliang Tang }
2636ee2708aeSGeliang Tang
2637ee2708aeSGeliang Tang msk->bytes_retrans += len;
2638ee2708aeSGeliang Tang dfrag->already_sent = max(dfrag->already_sent, len);
26392948d0a1SPaolo Abeni
26402948d0a1SPaolo Abeni reset_timer:
26413241a9c0SFlorian Westphal mptcp_check_and_set_pending(sk);
26423241a9c0SFlorian Westphal
2643f6909dc1SPaolo Abeni if (!mptcp_rtx_timer_pending(sk))
2644f6909dc1SPaolo Abeni mptcp_reset_rtx_timer(sk);
26452948d0a1SPaolo Abeni }
26462948d0a1SPaolo Abeni
264776a13b31SGeliang Tang /* schedule the timeout timer for the relevant event: either close timeout
264876a13b31SGeliang Tang * or mp_fail timeout. The close timeout takes precedence on the mp_fail one
264976a13b31SGeliang Tang */
mptcp_reset_tout_timer(struct mptcp_sock * msk,unsigned long fail_tout)2650f6909dc1SPaolo Abeni void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout)
265176a13b31SGeliang Tang {
265276a13b31SGeliang Tang struct sock *sk = (struct sock *)msk;
265376a13b31SGeliang Tang unsigned long timeout, close_timeout;
265476a13b31SGeliang Tang
265527e5ccc2SPaolo Abeni if (!fail_tout && !inet_csk(sk)->icsk_mtup.probe_timestamp)
265676a13b31SGeliang Tang return;
265776a13b31SGeliang Tang
265827e5ccc2SPaolo Abeni close_timeout = inet_csk(sk)->icsk_mtup.probe_timestamp - tcp_jiffies32 + jiffies +
265927e5ccc2SPaolo Abeni TCP_TIMEWAIT_LEN;
266076a13b31SGeliang Tang
266176a13b31SGeliang Tang /* the close timeout takes precedence on the fail one, and here at least one of
266276a13b31SGeliang Tang * them is active
266376a13b31SGeliang Tang */
266427e5ccc2SPaolo Abeni timeout = inet_csk(sk)->icsk_mtup.probe_timestamp ? close_timeout : fail_tout;
266576a13b31SGeliang Tang
266676a13b31SGeliang Tang sk_reset_timer(sk, &sk->sk_timer, timeout);
266776a13b31SGeliang Tang }
266876a13b31SGeliang Tang
mptcp_mp_fail_no_response(struct mptcp_sock * msk)266949fa1919SGeliang Tang static void mptcp_mp_fail_no_response(struct mptcp_sock *msk)
267049fa1919SGeliang Tang {
267176a13b31SGeliang Tang struct sock *ssk = msk->first;
267249fa1919SGeliang Tang bool slow;
267349fa1919SGeliang Tang
267476a13b31SGeliang Tang if (!ssk)
267576a13b31SGeliang Tang return;
267676a13b31SGeliang Tang
267749fa1919SGeliang Tang pr_debug("MP_FAIL doesn't respond, reset the subflow");
267849fa1919SGeliang Tang
267949fa1919SGeliang Tang slow = lock_sock_fast(ssk);
268049fa1919SGeliang Tang mptcp_subflow_reset(ssk);
268176a13b31SGeliang Tang WRITE_ONCE(mptcp_subflow_ctx(ssk)->fail_tout, 0);
268249fa1919SGeliang Tang unlock_sock_fast(ssk, slow);
268349fa1919SGeliang Tang }
268449fa1919SGeliang Tang
mptcp_do_fastclose(struct sock * sk)2685d21f8348SPaolo Abeni static void mptcp_do_fastclose(struct sock *sk)
2686d21f8348SPaolo Abeni {
2687d21f8348SPaolo Abeni struct mptcp_subflow_context *subflow, *tmp;
2688d21f8348SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
2689d21f8348SPaolo Abeni
2690d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
2691d21f8348SPaolo Abeni mptcp_for_each_subflow_safe(msk, subflow, tmp)
2692d21f8348SPaolo Abeni __mptcp_close_ssk(sk, mptcp_subflow_tcp_sock(subflow),
2693d21f8348SPaolo Abeni subflow, MPTCP_CF_FASTCLOSE);
2694d21f8348SPaolo Abeni }
2695d21f8348SPaolo Abeni
mptcp_worker(struct work_struct * work)26962948d0a1SPaolo Abeni static void mptcp_worker(struct work_struct *work)
26972948d0a1SPaolo Abeni {
26982948d0a1SPaolo Abeni struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work);
269980638684SGeliang Tang struct sock *sk = (struct sock *)msk;
270076a13b31SGeliang Tang unsigned long fail_tout;
27012948d0a1SPaolo Abeni int state;
270280992017SPaolo Abeni
270380992017SPaolo Abeni lock_sock(sk);
2704e16163b6SPaolo Abeni state = sk->sk_state;
2705d6a04437SPaolo Abeni if (unlikely((1 << state) & (TCPF_CLOSE | TCPF_LISTEN)))
2706e16163b6SPaolo Abeni goto unlock;
2707e16163b6SPaolo Abeni
270850c504a2SFlorian Westphal mptcp_check_fastclose(msk);
270950c504a2SFlorian Westphal
2710e9801430SFlorian Westphal mptcp_pm_nl_work(msk);
2711b416268bSFlorian Westphal
271281c1d029SPaolo Abeni mptcp_check_send_data_fin(sk);
271381c1d029SPaolo Abeni mptcp_check_data_fin_ack(sk);
271443b54c6eSMat Martineau mptcp_check_data_fin(sk);
271543b54c6eSMat Martineau
2716b6985b9bSPaolo Abeni if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags))
2717b6985b9bSPaolo Abeni __mptcp_close_subflow(sk);
2718b6985b9bSPaolo Abeni
271927e5ccc2SPaolo Abeni if (mptcp_close_tout_expired(sk)) {
2720d21f8348SPaolo Abeni mptcp_do_fastclose(sk);
272127e5ccc2SPaolo Abeni mptcp_close_wake_up(sk);
272227e5ccc2SPaolo Abeni }
2723bbd49d11SPaolo Abeni
272427e5ccc2SPaolo Abeni if (sock_flag(sk, SOCK_DEAD) && sk->sk_state == TCP_CLOSE) {
2725e16163b6SPaolo Abeni __mptcp_destroy_sock(sk);
2726e16163b6SPaolo Abeni goto unlock;
2727e16163b6SPaolo Abeni }
2728e16163b6SPaolo Abeni
27292948d0a1SPaolo Abeni if (test_and_clear_bit(MPTCP_WORK_RTX, &msk->flags))
27302948d0a1SPaolo Abeni __mptcp_retrans(sk);
27313b1d6210SPaolo Abeni
273276a13b31SGeliang Tang fail_tout = msk->first ? READ_ONCE(mptcp_subflow_ctx(msk->first)->fail_tout) : 0;
273376a13b31SGeliang Tang if (fail_tout && time_after(jiffies, fail_tout))
273449fa1919SGeliang Tang mptcp_mp_fail_no_response(msk);
273549fa1919SGeliang Tang
27363b1d6210SPaolo Abeni unlock:
273780992017SPaolo Abeni release_sock(sk);
273880992017SPaolo Abeni sock_put(sk);
273980992017SPaolo Abeni }
274080992017SPaolo Abeni
__mptcp_init_sock(struct sock * sk)2741e2636917SKuniyuki Iwashima static void __mptcp_init_sock(struct sock *sk)
2742f870fa0bSMat Martineau {
2743cec37a6eSPeter Krystad struct mptcp_sock *msk = mptcp_sk(sk);
2744cec37a6eSPeter Krystad
2745cec37a6eSPeter Krystad INIT_LIST_HEAD(&msk->conn_list);
2746ec3edaa7SPeter Krystad INIT_LIST_HEAD(&msk->join_list);
274718b683bfSPaolo Abeni INIT_LIST_HEAD(&msk->rtx_queue);
274880992017SPaolo Abeni INIT_WORK(&msk->work, mptcp_worker);
274987952603SPaolo Abeni __skb_queue_head_init(&msk->receive_queue);
2750ab174ad8SPaolo Abeni msk->out_of_order_queue = RB_ROOT;
2751f0e6a4cfSPaolo Abeni msk->first_pending = NULL;
27526511882cSPaolo Abeni msk->rmem_fwd_alloc = 0;
2753ce599c51SPaolo Abeni WRITE_ONCE(msk->rmem_released, 0);
275433d41c9cSPaolo Abeni msk->timer_ival = TCP_RTO_MIN;
2755cec37a6eSPeter Krystad
27561b1b43eeSPaolo Abeni WRITE_ONCE(msk->first, NULL);
2757dc24f8b4SPaolo Abeni inet_csk(sk)->icsk_sync_mss = mptcp_sync_mss;
2758752e9067SGeliang Tang WRITE_ONCE(msk->csum_enabled, mptcp_is_checksum_enabled(sock_net(sk)));
27590530020aSGeliang Tang WRITE_ONCE(msk->allow_infinite_fallback, true);
27601e1d9d6fSPaolo Abeni msk->recovery = false;
27616f06b4d4SPaolo Abeni msk->subflow_id = 1;
27628ab183deSPaolo Abeni
27631b1c7a0eSPeter Krystad mptcp_pm_data_init(msk);
27641b1c7a0eSPeter Krystad
2765b51f9b80SPaolo Abeni /* re-use the csk retrans timer for MPTCP-level retrans */
2766b51f9b80SPaolo Abeni timer_setup(&msk->sk.icsk_retransmit_timer, mptcp_retransmit_timer, 0);
2767f6909dc1SPaolo Abeni timer_setup(&sk->sk_timer, mptcp_tout_timer, 0);
2768f870fa0bSMat Martineau }
2769f870fa0bSMat Martineau
mptcp_ca_reset(struct sock * sk)2770b29fcfb5SPaolo Abeni static void mptcp_ca_reset(struct sock *sk)
2771784325e9SMatthieu Baerts {
277220b5759fSPaolo Abeni struct inet_connection_sock *icsk = inet_csk(sk);
2773b29fcfb5SPaolo Abeni
2774b29fcfb5SPaolo Abeni tcp_assign_congestion_control(sk);
2775b29fcfb5SPaolo Abeni strcpy(mptcp_sk(sk)->ca_name, icsk->icsk_ca_ops->name);
2776b29fcfb5SPaolo Abeni
2777b29fcfb5SPaolo Abeni /* no need to keep a reference to the ops, the name will suffice */
2778b29fcfb5SPaolo Abeni tcp_cleanup_congestion_control(sk);
2779b29fcfb5SPaolo Abeni icsk->icsk_ca_ops = NULL;
2780b29fcfb5SPaolo Abeni }
2781b29fcfb5SPaolo Abeni
mptcp_init_sock(struct sock * sk)2782b29fcfb5SPaolo Abeni static int mptcp_init_sock(struct sock *sk)
2783b29fcfb5SPaolo Abeni {
2784fc518953SFlorian Westphal struct net *net = sock_net(sk);
27851730b2b2SGeliang Tang int ret;
278618b683bfSPaolo Abeni
2787e2636917SKuniyuki Iwashima __mptcp_init_sock(sk);
2788b6c08380SGeliang Tang
2789fc518953SFlorian Westphal if (!mptcp_is_enabled(net))
2790fc518953SFlorian Westphal return -ENOPROTOOPT;
2791fc518953SFlorian Westphal
2792fc518953SFlorian Westphal if (unlikely(!net->mib.mptcp_statistics) && !mptcp_mib_alloc(net))
2793fc518953SFlorian Westphal return -ENOMEM;
2794fc518953SFlorian Westphal
27951730b2b2SGeliang Tang ret = mptcp_init_sched(mptcp_sk(sk),
27961730b2b2SGeliang Tang mptcp_sched_find(mptcp_get_scheduler(net)));
27971730b2b2SGeliang Tang if (ret)
27981730b2b2SGeliang Tang return ret;
27991730b2b2SGeliang Tang
2800a5ef058dSPaolo Abeni set_bit(SOCK_CUSTOM_SOCKOPT, &sk->sk_socket->flags);
2801a5ef058dSPaolo Abeni
280220b5759fSPaolo Abeni /* fetch the ca name; do it outside __mptcp_init_sock(), so that clone will
280320b5759fSPaolo Abeni * propagate the correct value
280420b5759fSPaolo Abeni */
2805b29fcfb5SPaolo Abeni mptcp_ca_reset(sk);
280620b5759fSPaolo Abeni
2807d027236cSPaolo Abeni sk_sockets_allocated_inc(sk);
2808a963853fSGeliang Tang sk->sk_rcvbuf = READ_ONCE(net->ipv4.sysctl_tcp_rmem[1]);
2809a963853fSGeliang Tang sk->sk_sndbuf = READ_ONCE(net->ipv4.sysctl_tcp_wmem[1]);
2810d027236cSPaolo Abeni
281118b683bfSPaolo Abeni return 0;
281218b683bfSPaolo Abeni }
281318b683bfSPaolo Abeni
__mptcp_clear_xmit(struct sock * sk)281418b683bfSPaolo Abeni static void __mptcp_clear_xmit(struct sock *sk)
281518b683bfSPaolo Abeni {
281618b683bfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
281718b683bfSPaolo Abeni struct mptcp_data_frag *dtmp, *dfrag;
281818b683bfSPaolo Abeni
2819d9ca1de8SPaolo Abeni WRITE_ONCE(msk->first_pending, NULL);
282018b683bfSPaolo Abeni list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list)
2821d027236cSPaolo Abeni dfrag_clear(sk, dfrag);
2822784325e9SMatthieu Baerts }
2823784325e9SMatthieu Baerts
mptcp_cancel_work(struct sock * sk)282430e51b92SMenglong Dong void mptcp_cancel_work(struct sock *sk)
282580992017SPaolo Abeni {
282680992017SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
282780992017SPaolo Abeni
2828b2771d24SPaolo Abeni if (cancel_work_sync(&msk->work))
2829e16163b6SPaolo Abeni __sock_put(sk);
283080992017SPaolo Abeni }
283180992017SPaolo Abeni
mptcp_subflow_shutdown(struct sock * sk,struct sock * ssk,int how)2832d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how)
283321498490SPeter Krystad {
283421498490SPeter Krystad lock_sock(ssk);
283521498490SPeter Krystad
283621498490SPeter Krystad switch (ssk->sk_state) {
283721498490SPeter Krystad case TCP_LISTEN:
283821498490SPeter Krystad if (!(how & RCV_SHUTDOWN))
283921498490SPeter Krystad break;
2840df561f66SGustavo A. R. Silva fallthrough;
284121498490SPeter Krystad case TCP_SYN_SENT:
2842c2b2ae39SPaolo Abeni WARN_ON_ONCE(tcp_disconnect(ssk, O_NONBLOCK));
284321498490SPeter Krystad break;
284421498490SPeter Krystad default:
284543b54c6eSMat Martineau if (__mptcp_check_fallback(mptcp_sk(sk))) {
284643b54c6eSMat Martineau pr_debug("Fallback");
284721498490SPeter Krystad ssk->sk_shutdown |= how;
284821498490SPeter Krystad tcp_shutdown(ssk, how);
284981c1d029SPaolo Abeni
285081c1d029SPaolo Abeni /* simulate the data_fin ack reception to let the state
285181c1d029SPaolo Abeni * machine move forward
285281c1d029SPaolo Abeni */
285381c1d029SPaolo Abeni WRITE_ONCE(mptcp_sk(sk)->snd_una, mptcp_sk(sk)->snd_nxt);
285481c1d029SPaolo Abeni mptcp_schedule_work(sk);
285543b54c6eSMat Martineau } else {
285643b54c6eSMat Martineau pr_debug("Sending DATA_FIN on subflow %p", ssk);
285743b54c6eSMat Martineau tcp_send_ack(ssk);
2858f6909dc1SPaolo Abeni if (!mptcp_rtx_timer_pending(sk))
2859f6909dc1SPaolo Abeni mptcp_reset_rtx_timer(sk);
286043b54c6eSMat Martineau }
286121498490SPeter Krystad break;
286221498490SPeter Krystad }
286321498490SPeter Krystad
286421498490SPeter Krystad release_sock(ssk);
286521498490SPeter Krystad }
286621498490SPeter Krystad
mptcp_set_state(struct sock * sk,int state)286756557547SGeliang Tang void mptcp_set_state(struct sock *sk, int state)
286856557547SGeliang Tang {
286956557547SGeliang Tang int oldstate = sk->sk_state;
287056557547SGeliang Tang
287156557547SGeliang Tang switch (state) {
287256557547SGeliang Tang case TCP_ESTABLISHED:
287356557547SGeliang Tang if (oldstate != TCP_ESTABLISHED)
287456557547SGeliang Tang MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_CURRESTAB);
287556557547SGeliang Tang break;
28763dd41669SJason Xing case TCP_CLOSE_WAIT:
28773dd41669SJason Xing /* Unlike TCP, MPTCP sk would not have the TCP_SYN_RECV state:
28783dd41669SJason Xing * MPTCP "accepted" sockets will be created later on. So no
28793dd41669SJason Xing * transition from TCP_SYN_RECV to TCP_CLOSE_WAIT.
28803dd41669SJason Xing */
28813dd41669SJason Xing break;
288256557547SGeliang Tang default:
28833dd41669SJason Xing if (oldstate == TCP_ESTABLISHED || oldstate == TCP_CLOSE_WAIT)
288456557547SGeliang Tang MPTCP_DEC_STATS(sock_net(sk), MPTCP_MIB_CURRESTAB);
288556557547SGeliang Tang }
288656557547SGeliang Tang
288756557547SGeliang Tang inet_sk_state_store(sk, state);
288856557547SGeliang Tang }
288956557547SGeliang Tang
28906920b851SMat Martineau static const unsigned char new_state[16] = {
28916920b851SMat Martineau /* current state: new state: action: */
28926920b851SMat Martineau [0 /* (Invalid) */] = TCP_CLOSE,
28936920b851SMat Martineau [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN,
28946920b851SMat Martineau [TCP_SYN_SENT] = TCP_CLOSE,
28956920b851SMat Martineau [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN,
28966920b851SMat Martineau [TCP_FIN_WAIT1] = TCP_FIN_WAIT1,
28976920b851SMat Martineau [TCP_FIN_WAIT2] = TCP_FIN_WAIT2,
28986920b851SMat Martineau [TCP_TIME_WAIT] = TCP_CLOSE, /* should not happen ! */
28996920b851SMat Martineau [TCP_CLOSE] = TCP_CLOSE,
29006920b851SMat Martineau [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN,
29016920b851SMat Martineau [TCP_LAST_ACK] = TCP_LAST_ACK,
29026920b851SMat Martineau [TCP_LISTEN] = TCP_CLOSE,
29036920b851SMat Martineau [TCP_CLOSING] = TCP_CLOSING,
29046920b851SMat Martineau [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */
29056920b851SMat Martineau };
29066920b851SMat Martineau
mptcp_close_state(struct sock * sk)29076920b851SMat Martineau static int mptcp_close_state(struct sock *sk)
29086920b851SMat Martineau {
29096920b851SMat Martineau int next = (int)new_state[sk->sk_state];
29106920b851SMat Martineau int ns = next & TCP_STATE_MASK;
29116920b851SMat Martineau
2912d52b3c2bSGeliang Tang mptcp_set_state(sk, ns);
29136920b851SMat Martineau
29146920b851SMat Martineau return next & TCP_ACTION_FIN;
29156920b851SMat Martineau }
29166920b851SMat Martineau
mptcp_check_send_data_fin(struct sock * sk)291781c1d029SPaolo Abeni static void mptcp_check_send_data_fin(struct sock *sk)
2918e16163b6SPaolo Abeni {
2919e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow;
2920e16163b6SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
2921e16163b6SPaolo Abeni
2922e16163b6SPaolo Abeni pr_debug("msk=%p snd_data_fin_enable=%d pending=%d snd_nxt=%llu write_seq=%llu",
2923e16163b6SPaolo Abeni msk, msk->snd_data_fin_enable, !!mptcp_send_head(sk),
2924e16163b6SPaolo Abeni msk->snd_nxt, msk->write_seq);
2925e16163b6SPaolo Abeni
2926e16163b6SPaolo Abeni /* we still need to enqueue subflows or not really shutting down,
2927e16163b6SPaolo Abeni * skip this
2928e16163b6SPaolo Abeni */
2929e16163b6SPaolo Abeni if (!msk->snd_data_fin_enable || msk->snd_nxt + 1 != msk->write_seq ||
2930e16163b6SPaolo Abeni mptcp_send_head(sk))
2931e16163b6SPaolo Abeni return;
2932e16163b6SPaolo Abeni
2933e16163b6SPaolo Abeni WRITE_ONCE(msk->snd_nxt, msk->write_seq);
2934e16163b6SPaolo Abeni
2935e16163b6SPaolo Abeni mptcp_for_each_subflow(msk, subflow) {
2936e16163b6SPaolo Abeni struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow);
2937e16163b6SPaolo Abeni
2938e16163b6SPaolo Abeni mptcp_subflow_shutdown(sk, tcp_sk, SEND_SHUTDOWN);
2939e16163b6SPaolo Abeni }
2940e16163b6SPaolo Abeni }
2941e16163b6SPaolo Abeni
__mptcp_wr_shutdown(struct sock * sk)2942e16163b6SPaolo Abeni static void __mptcp_wr_shutdown(struct sock *sk)
2943e16163b6SPaolo Abeni {
2944e16163b6SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
2945e16163b6SPaolo Abeni
2946e16163b6SPaolo Abeni pr_debug("msk=%p snd_data_fin_enable=%d shutdown=%x state=%d pending=%d",
2947e16163b6SPaolo Abeni msk, msk->snd_data_fin_enable, sk->sk_shutdown, sk->sk_state,
2948e16163b6SPaolo Abeni !!mptcp_send_head(sk));
2949e16163b6SPaolo Abeni
2950e16163b6SPaolo Abeni /* will be ignored by fallback sockets */
2951e16163b6SPaolo Abeni WRITE_ONCE(msk->write_seq, msk->write_seq + 1);
2952e16163b6SPaolo Abeni WRITE_ONCE(msk->snd_data_fin_enable, 1);
2953e16163b6SPaolo Abeni
295481c1d029SPaolo Abeni mptcp_check_send_data_fin(sk);
2955e16163b6SPaolo Abeni }
2956e16163b6SPaolo Abeni
__mptcp_destroy_sock(struct sock * sk)2957e16163b6SPaolo Abeni static void __mptcp_destroy_sock(struct sock *sk)
2958f870fa0bSMat Martineau {
2959f870fa0bSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk);
2960f870fa0bSMat Martineau
2961e16163b6SPaolo Abeni pr_debug("msk=%p", msk);
29622c22c06cSFlorian Westphal
29633abc05d9SFlorian Westphal might_sleep();
29643abc05d9SFlorian Westphal
2965f6909dc1SPaolo Abeni mptcp_stop_rtx_timer(sk);
2966e16163b6SPaolo Abeni sk_stop_timer(sk, &sk->sk_timer);
2967e16163b6SPaolo Abeni msk->pm.status = 0;
29681730b2b2SGeliang Tang mptcp_release_sched(msk);
2969b2c5b614SFlorian Westphal
2970e16163b6SPaolo Abeni sk->sk_prot->destroy(sk);
2971e16163b6SPaolo Abeni
29726511882cSPaolo Abeni WARN_ON_ONCE(msk->rmem_fwd_alloc);
297387952603SPaolo Abeni WARN_ON_ONCE(msk->rmem_released);
2974e16163b6SPaolo Abeni sk_stream_kill_queues(sk);
2975e16163b6SPaolo Abeni xfrm_sk_free_policy(sk);
2976aa1fbd94SFlorian Westphal
2977e16163b6SPaolo Abeni sock_put(sk);
2978e16163b6SPaolo Abeni }
2979e16163b6SPaolo Abeni
__mptcp_unaccepted_force_close(struct sock * sk)298063740448SPaolo Abeni void __mptcp_unaccepted_force_close(struct sock *sk)
298163740448SPaolo Abeni {
298263740448SPaolo Abeni sock_set_flag(sk, SOCK_DEAD);
298363740448SPaolo Abeni mptcp_do_fastclose(sk);
298463740448SPaolo Abeni __mptcp_destroy_sock(sk);
298563740448SPaolo Abeni }
298663740448SPaolo Abeni
mptcp_check_readable(struct mptcp_sock * msk)2987d21f8348SPaolo Abeni static __poll_t mptcp_check_readable(struct mptcp_sock *msk)
2988d21f8348SPaolo Abeni {
2989d21f8348SPaolo Abeni /* Concurrent splices from sk_receive_queue into receive_queue will
2990d21f8348SPaolo Abeni * always show at least one non-empty queue when checked in this order.
2991d21f8348SPaolo Abeni */
2992d21f8348SPaolo Abeni if (skb_queue_empty_lockless(&((struct sock *)msk)->sk_receive_queue) &&
2993d21f8348SPaolo Abeni skb_queue_empty_lockless(&msk->receive_queue))
2994d21f8348SPaolo Abeni return 0;
2995d21f8348SPaolo Abeni
2996d21f8348SPaolo Abeni return EPOLLIN | EPOLLRDNORM;
2997d21f8348SPaolo Abeni }
2998d21f8348SPaolo Abeni
mptcp_check_listen_stop(struct sock * sk)299957fc0f1cSPaolo Abeni static void mptcp_check_listen_stop(struct sock *sk)
3000c558246eSMenglong Dong {
300157fc0f1cSPaolo Abeni struct sock *ssk;
300257fc0f1cSPaolo Abeni
300357fc0f1cSPaolo Abeni if (inet_sk_state_load(sk) != TCP_LISTEN)
300457fc0f1cSPaolo Abeni return;
300557fc0f1cSPaolo Abeni
3006c558246eSMenglong Dong sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
300757fc0f1cSPaolo Abeni ssk = mptcp_sk(sk)->first;
300857fc0f1cSPaolo Abeni if (WARN_ON_ONCE(!ssk || inet_sk_state_load(ssk) != TCP_LISTEN))
300957fc0f1cSPaolo Abeni return;
301057fc0f1cSPaolo Abeni
301157fc0f1cSPaolo Abeni lock_sock_nested(ssk, SINGLE_DEPTH_NESTING);
30123fffa15bSPaolo Abeni tcp_set_state(ssk, TCP_CLOSE);
301357fc0f1cSPaolo Abeni mptcp_subflow_queue_clean(sk, ssk);
301457fc0f1cSPaolo Abeni inet_csk_listen_stop(ssk);
301557fc0f1cSPaolo Abeni mptcp_event_pm_listener(ssk, MPTCP_EVENT_LISTENER_CLOSED);
301657fc0f1cSPaolo Abeni release_sock(ssk);
3017c558246eSMenglong Dong }
3018c558246eSMenglong Dong
__mptcp_close(struct sock * sk,long timeout)301926d3e21cSMenglong Dong bool __mptcp_close(struct sock *sk, long timeout)
3020e16163b6SPaolo Abeni {
3021e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow;
302276a13b31SGeliang Tang struct mptcp_sock *msk = mptcp_sk(sk);
3023e16163b6SPaolo Abeni bool do_cancel_work = false;
3024d4e85922SPaolo Abeni int subflows_alive = 0;
3025e16163b6SPaolo Abeni
30266b9831bfSPaolo Abeni WRITE_ONCE(sk->sk_shutdown, SHUTDOWN_MASK);
3027e16163b6SPaolo Abeni
3028e16163b6SPaolo Abeni if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) {
302957fc0f1cSPaolo Abeni mptcp_check_listen_stop(sk);
3030d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
3031e16163b6SPaolo Abeni goto cleanup;
3032e16163b6SPaolo Abeni }
3033e16163b6SPaolo Abeni
30348d547809SPaolo Abeni if (mptcp_check_readable(msk) || timeout < 0) {
30358d547809SPaolo Abeni /* If the msk has read data, or the caller explicitly ask it,
30368d547809SPaolo Abeni * do the MPTCP equivalent of TCP reset, aka MPTCP fastclose
30378d547809SPaolo Abeni */
3038d21f8348SPaolo Abeni mptcp_do_fastclose(sk);
30398d547809SPaolo Abeni timeout = 0;
3040d21f8348SPaolo Abeni } else if (mptcp_close_state(sk)) {
3041e16163b6SPaolo Abeni __mptcp_wr_shutdown(sk);
3042d21f8348SPaolo Abeni }
3043e16163b6SPaolo Abeni
3044e16163b6SPaolo Abeni sk_stream_wait_close(sk, timeout);
3045e16163b6SPaolo Abeni
3046e16163b6SPaolo Abeni cleanup:
3047e16163b6SPaolo Abeni /* orphan all the subflows */
304876a13b31SGeliang Tang mptcp_for_each_subflow(msk, subflow) {
3049e16163b6SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
305049054556SPaolo Abeni bool slow = lock_sock_fast_nested(ssk);
3051e16163b6SPaolo Abeni
3052d4e85922SPaolo Abeni subflows_alive += ssk->sk_state != TCP_CLOSE;
3053d4e85922SPaolo Abeni
305476a13b31SGeliang Tang /* since the close timeout takes precedence on the fail one,
305576a13b31SGeliang Tang * cancel the latter
305676a13b31SGeliang Tang */
305776a13b31SGeliang Tang if (ssk == msk->first)
305876a13b31SGeliang Tang subflow->fail_tout = 0;
305976a13b31SGeliang Tang
3060fe948001SMenglong Dong /* detach from the parent socket, but allow data_ready to
3061fe948001SMenglong Dong * push incoming data into the mptcp stack, to properly ack it
3062fe948001SMenglong Dong */
3063fe948001SMenglong Dong ssk->sk_socket = NULL;
3064fe948001SMenglong Dong ssk->sk_wq = NULL;
3065e16163b6SPaolo Abeni unlock_sock_fast(ssk, slow);
3066e16163b6SPaolo Abeni }
3067e16163b6SPaolo Abeni sock_orphan(sk);
3068e16163b6SPaolo Abeni
3069d4e85922SPaolo Abeni /* all the subflows are closed, only timeout can change the msk
3070d4e85922SPaolo Abeni * state, let's not keep resources busy for no reasons
3071d4e85922SPaolo Abeni */
3072d4e85922SPaolo Abeni if (subflows_alive == 0)
3073d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
3074d4e85922SPaolo Abeni
3075e16163b6SPaolo Abeni sock_hold(sk);
3076e16163b6SPaolo Abeni pr_debug("msk=%p state=%d", sk, sk->sk_state);
307700df24f1SGeliang Tang if (msk->token)
307876a13b31SGeliang Tang mptcp_event(MPTCP_EVENT_CLOSED, msk, NULL, GFP_KERNEL);
3079b29fcfb5SPaolo Abeni
3080e16163b6SPaolo Abeni if (sk->sk_state == TCP_CLOSE) {
3081e16163b6SPaolo Abeni __mptcp_destroy_sock(sk);
3082e16163b6SPaolo Abeni do_cancel_work = true;
3083e16163b6SPaolo Abeni } else {
308427e5ccc2SPaolo Abeni mptcp_start_tout_timer(sk);
3085e16163b6SPaolo Abeni }
308626d3e21cSMenglong Dong
308726d3e21cSMenglong Dong return do_cancel_work;
308826d3e21cSMenglong Dong }
308926d3e21cSMenglong Dong
mptcp_close(struct sock * sk,long timeout)309026d3e21cSMenglong Dong static void mptcp_close(struct sock *sk, long timeout)
309126d3e21cSMenglong Dong {
309226d3e21cSMenglong Dong bool do_cancel_work;
309326d3e21cSMenglong Dong
309426d3e21cSMenglong Dong lock_sock(sk);
309526d3e21cSMenglong Dong
309626d3e21cSMenglong Dong do_cancel_work = __mptcp_close(sk, timeout);
3097e16163b6SPaolo Abeni release_sock(sk);
3098e16163b6SPaolo Abeni if (do_cancel_work)
309980992017SPaolo Abeni mptcp_cancel_work(sk);
3100b911c97cSFlorian Westphal
3101e16163b6SPaolo Abeni sock_put(sk);
3102f870fa0bSMat Martineau }
3103f870fa0bSMat Martineau
mptcp_copy_inaddrs(struct sock * msk,const struct sock * ssk)31047e8b88ecSPaolo Abeni static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk)
3105cf7da0d6SPeter Krystad {
3106cf7da0d6SPeter Krystad #if IS_ENABLED(CONFIG_MPTCP_IPV6)
3107cf7da0d6SPeter Krystad const struct ipv6_pinfo *ssk6 = inet6_sk(ssk);
3108cf7da0d6SPeter Krystad struct ipv6_pinfo *msk6 = inet6_sk(msk);
3109cf7da0d6SPeter Krystad
3110cf7da0d6SPeter Krystad msk->sk_v6_daddr = ssk->sk_v6_daddr;
3111cf7da0d6SPeter Krystad msk->sk_v6_rcv_saddr = ssk->sk_v6_rcv_saddr;
3112cf7da0d6SPeter Krystad
3113cf7da0d6SPeter Krystad if (msk6 && ssk6) {
3114cf7da0d6SPeter Krystad msk6->saddr = ssk6->saddr;
3115cf7da0d6SPeter Krystad msk6->flow_label = ssk6->flow_label;
3116cf7da0d6SPeter Krystad }
3117cf7da0d6SPeter Krystad #endif
3118cf7da0d6SPeter Krystad
3119cf7da0d6SPeter Krystad inet_sk(msk)->inet_num = inet_sk(ssk)->inet_num;
3120cf7da0d6SPeter Krystad inet_sk(msk)->inet_dport = inet_sk(ssk)->inet_dport;
3121cf7da0d6SPeter Krystad inet_sk(msk)->inet_sport = inet_sk(ssk)->inet_sport;
3122cf7da0d6SPeter Krystad inet_sk(msk)->inet_daddr = inet_sk(ssk)->inet_daddr;
3123cf7da0d6SPeter Krystad inet_sk(msk)->inet_saddr = inet_sk(ssk)->inet_saddr;
3124cf7da0d6SPeter Krystad inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr;
3125cf7da0d6SPeter Krystad }
3126cf7da0d6SPeter Krystad
mptcp_disconnect(struct sock * sk,int flags)312718b683bfSPaolo Abeni static int mptcp_disconnect(struct sock *sk, int flags)
312818b683bfSPaolo Abeni {
312976e2a55dSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
313076e2a55dSPaolo Abeni
31317d803344SPaolo Abeni /* We are on the fastopen error path. We can't call straight into the
31327d803344SPaolo Abeni * subflows cleanup code due to lock nesting (we are already under
3133c2b2ae39SPaolo Abeni * msk->firstsocket lock).
31347d803344SPaolo Abeni */
31357d803344SPaolo Abeni if (msk->fastopening)
3136c2b2ae39SPaolo Abeni return -EBUSY;
31377d803344SPaolo Abeni
313857fc0f1cSPaolo Abeni mptcp_check_listen_stop(sk);
3139d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
3140b29fcfb5SPaolo Abeni
3141f6909dc1SPaolo Abeni mptcp_stop_rtx_timer(sk);
314227e5ccc2SPaolo Abeni mptcp_stop_tout_timer(sk);
3143b29fcfb5SPaolo Abeni
314400df24f1SGeliang Tang if (msk->token)
314500df24f1SGeliang Tang mptcp_event(MPTCP_EVENT_CLOSED, msk, NULL, GFP_KERNEL);
3146b29fcfb5SPaolo Abeni
3147c0bf3c6aSPaolo Abeni /* msk->subflow is still intact, the following will not free the first
3148c0bf3c6aSPaolo Abeni * subflow
3149c0bf3c6aSPaolo Abeni */
3150c0bf3c6aSPaolo Abeni mptcp_destroy_common(msk, MPTCP_CF_FASTCLOSE);
3151e9d09bacSPaolo Abeni WRITE_ONCE(msk->flags, 0);
3152e9d09bacSPaolo Abeni msk->cb_flags = 0;
3153b29fcfb5SPaolo Abeni msk->recovery = false;
3154b29fcfb5SPaolo Abeni msk->can_ack = false;
3155b29fcfb5SPaolo Abeni msk->fully_established = false;
3156b29fcfb5SPaolo Abeni msk->rcv_data_fin = false;
3157b29fcfb5SPaolo Abeni msk->snd_data_fin_enable = false;
3158b29fcfb5SPaolo Abeni msk->rcv_fastclose = false;
3159b29fcfb5SPaolo Abeni msk->use_64bit_ack = false;
3160b29fcfb5SPaolo Abeni WRITE_ONCE(msk->csum_enabled, mptcp_is_checksum_enabled(sock_net(sk)));
3161b29fcfb5SPaolo Abeni mptcp_pm_data_reset(msk);
3162b29fcfb5SPaolo Abeni mptcp_ca_reset(sk);
316338967f42SPaolo Abeni msk->bytes_acked = 0;
316438967f42SPaolo Abeni msk->bytes_received = 0;
316538967f42SPaolo Abeni msk->bytes_sent = 0;
316638967f42SPaolo Abeni msk->bytes_retrans = 0;
3167a2d74374SPaolo Abeni msk->rcvspace_init = 0;
3168b29fcfb5SPaolo Abeni
31696b9831bfSPaolo Abeni WRITE_ONCE(sk->sk_shutdown, 0);
3170b29fcfb5SPaolo Abeni sk_error_report(sk);
317142c556feSFlorian Westphal return 0;
317218b683bfSPaolo Abeni }
317318b683bfSPaolo Abeni
3174b0519de8SFlorian Westphal #if IS_ENABLED(CONFIG_MPTCP_IPV6)
mptcp_inet6_sk(const struct sock * sk)3175b0519de8SFlorian Westphal static struct ipv6_pinfo *mptcp_inet6_sk(const struct sock *sk)
3176b0519de8SFlorian Westphal {
3177b0519de8SFlorian Westphal unsigned int offset = sizeof(struct mptcp6_sock) - sizeof(struct ipv6_pinfo);
3178b0519de8SFlorian Westphal
3179b0519de8SFlorian Westphal return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
3180b0519de8SFlorian Westphal }
3181ce0809adSDavide Caratti
mptcp_copy_ip6_options(struct sock * newsk,const struct sock * sk)3182ce0809adSDavide Caratti static void mptcp_copy_ip6_options(struct sock *newsk, const struct sock *sk)
3183ce0809adSDavide Caratti {
3184ce0809adSDavide Caratti const struct ipv6_pinfo *np = inet6_sk(sk);
3185ce0809adSDavide Caratti struct ipv6_txoptions *opt;
3186ce0809adSDavide Caratti struct ipv6_pinfo *newnp;
3187ce0809adSDavide Caratti
3188ce0809adSDavide Caratti newnp = inet6_sk(newsk);
3189ce0809adSDavide Caratti
3190ce0809adSDavide Caratti rcu_read_lock();
3191ce0809adSDavide Caratti opt = rcu_dereference(np->opt);
3192ce0809adSDavide Caratti if (opt) {
3193ce0809adSDavide Caratti opt = ipv6_dup_options(newsk, opt);
3194ce0809adSDavide Caratti if (!opt)
3195ce0809adSDavide Caratti net_warn_ratelimited("%s: Failed to copy ip6 options\n", __func__);
3196ce0809adSDavide Caratti }
3197ce0809adSDavide Caratti RCU_INIT_POINTER(newnp->opt, opt);
3198ce0809adSDavide Caratti rcu_read_unlock();
3199ce0809adSDavide Caratti }
3200b0519de8SFlorian Westphal #endif
3201b0519de8SFlorian Westphal
mptcp_copy_ip_options(struct sock * newsk,const struct sock * sk)3202ce0809adSDavide Caratti static void mptcp_copy_ip_options(struct sock *newsk, const struct sock *sk)
3203ce0809adSDavide Caratti {
3204ce0809adSDavide Caratti struct ip_options_rcu *inet_opt, *newopt = NULL;
3205ce0809adSDavide Caratti const struct inet_sock *inet = inet_sk(sk);
3206ce0809adSDavide Caratti struct inet_sock *newinet;
3207ce0809adSDavide Caratti
3208ce0809adSDavide Caratti newinet = inet_sk(newsk);
3209ce0809adSDavide Caratti
3210ce0809adSDavide Caratti rcu_read_lock();
3211ce0809adSDavide Caratti inet_opt = rcu_dereference(inet->inet_opt);
3212ce0809adSDavide Caratti if (inet_opt) {
3213ce0809adSDavide Caratti newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
3214ce0809adSDavide Caratti inet_opt->opt.optlen, GFP_ATOMIC);
3215ce0809adSDavide Caratti if (newopt)
3216ce0809adSDavide Caratti memcpy(newopt, inet_opt, sizeof(*inet_opt) +
3217ce0809adSDavide Caratti inet_opt->opt.optlen);
3218ce0809adSDavide Caratti else
3219ce0809adSDavide Caratti net_warn_ratelimited("%s: Failed to copy ip options\n", __func__);
3220ce0809adSDavide Caratti }
3221ce0809adSDavide Caratti RCU_INIT_POINTER(newinet->inet_opt, newopt);
3222ce0809adSDavide Caratti rcu_read_unlock();
3223ce0809adSDavide Caratti }
3224ce0809adSDavide Caratti
mptcp_sk_clone_init(const struct sock * sk,const struct mptcp_options_received * mp_opt,struct sock * ssk,struct request_sock * req)32257e8b88ecSPaolo Abeni struct sock *mptcp_sk_clone_init(const struct sock *sk,
3226cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt,
32277e8b88ecSPaolo Abeni struct sock *ssk,
3228fca5c82cSPaolo Abeni struct request_sock *req)
3229b0519de8SFlorian Westphal {
323058b09919SPaolo Abeni struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
3231b0519de8SFlorian Westphal struct sock *nsk = sk_clone_lock(sk, GFP_ATOMIC);
3232b45df837SPaolo Abeni struct mptcp_subflow_context *subflow;
323358b09919SPaolo Abeni struct mptcp_sock *msk;
3234b0519de8SFlorian Westphal
3235b0519de8SFlorian Westphal if (!nsk)
3236b0519de8SFlorian Westphal return NULL;
3237b0519de8SFlorian Westphal
3238b0519de8SFlorian Westphal #if IS_ENABLED(CONFIG_MPTCP_IPV6)
3239b0519de8SFlorian Westphal if (nsk->sk_family == AF_INET6)
3240b0519de8SFlorian Westphal inet_sk(nsk)->pinet6 = mptcp_inet6_sk(nsk);
3241b0519de8SFlorian Westphal #endif
3242b0519de8SFlorian Westphal
324358b09919SPaolo Abeni __mptcp_init_sock(nsk);
324458b09919SPaolo Abeni
3245ce0809adSDavide Caratti #if IS_ENABLED(CONFIG_MPTCP_IPV6)
3246ce0809adSDavide Caratti if (nsk->sk_family == AF_INET6)
3247ce0809adSDavide Caratti mptcp_copy_ip6_options(nsk, sk);
3248ce0809adSDavide Caratti else
3249ce0809adSDavide Caratti #endif
3250ce0809adSDavide Caratti mptcp_copy_ip_options(nsk, sk);
3251ce0809adSDavide Caratti
325258b09919SPaolo Abeni msk = mptcp_sk(nsk);
325358b09919SPaolo Abeni msk->local_key = subflow_req->local_key;
325458b09919SPaolo Abeni msk->token = subflow_req->token;
3255b6985b9bSPaolo Abeni msk->in_accept_queue = 1;
3256b93df08cSPaolo Abeni WRITE_ONCE(msk->fully_established, false);
325774c7dfbeSPaolo Abeni if (mp_opt->suboptions & OPTION_MPTCP_CSUMREQD)
325806251181SGeliang Tang WRITE_ONCE(msk->csum_enabled, true);
325958b09919SPaolo Abeni
326058b09919SPaolo Abeni msk->write_seq = subflow_req->idsn + 1;
3261eaa2ffabSPaolo Abeni msk->snd_nxt = msk->write_seq;
32627439d687SPaolo Abeni msk->snd_una = msk->write_seq;
3263ae5530ccSPaolo Abeni msk->wnd_end = msk->snd_nxt + tcp_sk(ssk)->snd_wnd;
3264df00b087SFlorian Westphal msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq;
32651730b2b2SGeliang Tang mptcp_init_sched(msk, mptcp_sk(sk)->sched);
32666f8a612aSFlorian Westphal
32676f06b4d4SPaolo Abeni /* passive msk is created after the first/MPC subflow */
32686f06b4d4SPaolo Abeni msk->subflow_id = 2;
32696f06b4d4SPaolo Abeni
32705e20087dSFlorian Westphal sock_reset_flag(nsk, SOCK_RCU_FREE);
32710c148460SPaolo Abeni security_inet_csk_clone(nsk, req);
32727e8b88ecSPaolo Abeni
32737e8b88ecSPaolo Abeni /* this can't race with mptcp_close(), as the msk is
32747e8b88ecSPaolo Abeni * not yet exposted to user-space
32757e8b88ecSPaolo Abeni */
3276d52b3c2bSGeliang Tang mptcp_set_state(nsk, TCP_ESTABLISHED);
32777e8b88ecSPaolo Abeni
32787e8b88ecSPaolo Abeni /* The msk maintain a ref to each subflow in the connections list */
32797e8b88ecSPaolo Abeni WRITE_ONCE(msk->first, ssk);
3280b45df837SPaolo Abeni subflow = mptcp_subflow_ctx(ssk);
3281b45df837SPaolo Abeni list_add(&subflow->node, &msk->conn_list);
32827e8b88ecSPaolo Abeni sock_hold(ssk);
32837e8b88ecSPaolo Abeni
32847e8b88ecSPaolo Abeni /* new mpc subflow takes ownership of the newly
32857e8b88ecSPaolo Abeni * created mptcp socket
32867e8b88ecSPaolo Abeni */
32877e8b88ecSPaolo Abeni mptcp_token_accept(subflow_req, msk);
32887e8b88ecSPaolo Abeni
32897e8b88ecSPaolo Abeni /* set msk addresses early to ensure mptcp_pm_get_local_id()
32907e8b88ecSPaolo Abeni * uses the correct data
32917e8b88ecSPaolo Abeni */
32927e8b88ecSPaolo Abeni mptcp_copy_inaddrs(nsk, ssk);
329334c7757aSPaolo Abeni __mptcp_propagate_sndbuf(nsk, ssk);
32947e8b88ecSPaolo Abeni
32957e8b88ecSPaolo Abeni mptcp_rcv_space_init(msk, ssk);
3296b45df837SPaolo Abeni
3297b45df837SPaolo Abeni if (mp_opt->suboptions & OPTION_MPTCP_MPC_ACK)
3298b45df837SPaolo Abeni __mptcp_subflow_fully_established(msk, subflow, mp_opt);
329958b09919SPaolo Abeni bh_unlock_sock(nsk);
330058b09919SPaolo Abeni
3301b6985b9bSPaolo Abeni /* note: the newly allocated socket refcount is 2 now */
3302b0519de8SFlorian Westphal return nsk;
3303b0519de8SFlorian Westphal }
3304b0519de8SFlorian Westphal
mptcp_rcv_space_init(struct mptcp_sock * msk,const struct sock * ssk)3305a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk)
3306a6b118feSFlorian Westphal {
3307a6b118feSFlorian Westphal const struct tcp_sock *tp = tcp_sk(ssk);
3308a6b118feSFlorian Westphal
3309a2d74374SPaolo Abeni msk->rcvspace_init = 1;
3310a6b118feSFlorian Westphal msk->rcvq_space.copied = 0;
3311a6b118feSFlorian Westphal msk->rcvq_space.rtt_us = 0;
3312a6b118feSFlorian Westphal
3313a6b118feSFlorian Westphal msk->rcvq_space.time = tp->tcp_mstamp;
3314a6b118feSFlorian Westphal
3315a6b118feSFlorian Westphal /* initial rcv_space offering made to peer */
3316a6b118feSFlorian Westphal msk->rcvq_space.space = min_t(u32, tp->rcv_wnd,
3317a6b118feSFlorian Westphal TCP_INIT_CWND * tp->advmss);
3318a6b118feSFlorian Westphal if (msk->rcvq_space.space == 0)
3319a6b118feSFlorian Westphal msk->rcvq_space.space = TCP_INIT_CWND * TCP_MSS_DEFAULT;
3320a6b118feSFlorian Westphal }
3321a6b118feSFlorian Westphal
mptcp_destroy_common(struct mptcp_sock * msk,unsigned int flags)3322c0bf3c6aSPaolo Abeni void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags)
33235c8c1640SGeliang Tang {
3324c0bf3c6aSPaolo Abeni struct mptcp_subflow_context *subflow, *tmp;
332587952603SPaolo Abeni struct sock *sk = (struct sock *)msk;
332687952603SPaolo Abeni
33276e628cd3SPaolo Abeni __mptcp_clear_xmit(sk);
33286e628cd3SPaolo Abeni
3329c0bf3c6aSPaolo Abeni /* join list will be eventually flushed (with rst) at sock lock release time */
33305efbf6f7SMatthieu Baerts mptcp_for_each_subflow_safe(msk, subflow, tmp)
3331c0bf3c6aSPaolo Abeni __mptcp_close_ssk(sk, mptcp_subflow_tcp_sock(subflow), subflow, flags);
3332c0bf3c6aSPaolo Abeni
333387952603SPaolo Abeni /* move to sk_receive_queue, sk_stream_kill_queues will purge it */
3334b29fcfb5SPaolo Abeni mptcp_data_lock(sk);
333587952603SPaolo Abeni skb_queue_splice_tail_init(&msk->receive_queue, &sk->sk_receive_queue);
33366511882cSPaolo Abeni __skb_queue_purge(&sk->sk_receive_queue);
33375c8c1640SGeliang Tang skb_rbtree_purge(&msk->out_of_order_queue);
3338b29fcfb5SPaolo Abeni mptcp_data_unlock(sk);
33396511882cSPaolo Abeni
33406511882cSPaolo Abeni /* move all the rx fwd alloc into the sk_mem_reclaim_final in
33416511882cSPaolo Abeni * inet_sock_destruct() will dispose it
33426511882cSPaolo Abeni */
33435e6300e7SEric Dumazet sk_forward_alloc_add(sk, msk->rmem_fwd_alloc);
33449531e4a8SEric Dumazet WRITE_ONCE(msk->rmem_fwd_alloc, 0);
33455c8c1640SGeliang Tang mptcp_token_destroy(msk);
33465c8c1640SGeliang Tang mptcp_pm_free_anno_list(msk);
33474638de5aSKishen Maloor mptcp_free_local_addr_list(msk);
33485c8c1640SGeliang Tang }
33495c8c1640SGeliang Tang
mptcp_destroy(struct sock * sk)335079c0949eSPeter Krystad static void mptcp_destroy(struct sock *sk)
335179c0949eSPeter Krystad {
3352c9fd9c5fSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk);
3353c9fd9c5fSFlorian Westphal
335439880bd8SPaolo Abeni /* allow the following to close even the initial subflow */
335539880bd8SPaolo Abeni msk->free_first = 1;
3356c0bf3c6aSPaolo Abeni mptcp_destroy_common(msk, 0);
3357d027236cSPaolo Abeni sk_sockets_allocated_dec(sk);
335879c0949eSPeter Krystad }
335979c0949eSPeter Krystad
__mptcp_data_acked(struct sock * sk)33606e628cd3SPaolo Abeni void __mptcp_data_acked(struct sock *sk)
33616e628cd3SPaolo Abeni {
33626e628cd3SPaolo Abeni if (!sock_owned_by_user(sk))
33636e628cd3SPaolo Abeni __mptcp_clean_una(sk);
33646e628cd3SPaolo Abeni else
3365e9d09bacSPaolo Abeni __set_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->cb_flags);
33666e628cd3SPaolo Abeni
33676e628cd3SPaolo Abeni if (mptcp_pending_data_fin_ack(sk))
33686e628cd3SPaolo Abeni mptcp_schedule_work(sk);
33696e628cd3SPaolo Abeni }
33706e628cd3SPaolo Abeni
__mptcp_check_push(struct sock * sk,struct sock * ssk)3371219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk)
33726e628cd3SPaolo Abeni {
33736e628cd3SPaolo Abeni if (!mptcp_send_head(sk))
33746e628cd3SPaolo Abeni return;
33756e628cd3SPaolo Abeni
337673a0052aSGeliang Tang if (!sock_owned_by_user(sk))
337773a0052aSGeliang Tang __mptcp_subflow_push_pending(sk, ssk, false);
337873a0052aSGeliang Tang else
3379e9d09bacSPaolo Abeni __set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->cb_flags);
33806e628cd3SPaolo Abeni }
33816e628cd3SPaolo Abeni
3382e9d09bacSPaolo Abeni #define MPTCP_FLAGS_PROCESS_CTX_NEED (BIT(MPTCP_PUSH_PENDING) | \
3383e9d09bacSPaolo Abeni BIT(MPTCP_RETRANSMIT) | \
3384e9d09bacSPaolo Abeni BIT(MPTCP_FLUSH_JOIN_LIST))
3385e9d09bacSPaolo Abeni
3386e93da928SPaolo Abeni /* processes deferred events and flush wmem */
mptcp_release_cb(struct sock * sk)338714c441b5SPaolo Abeni static void mptcp_release_cb(struct sock *sk)
3388e9d09bacSPaolo Abeni __must_hold(&sk->sk_lock.slock)
338914c441b5SPaolo Abeni {
3390e9d09bacSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
33912d6f5a2bSPaolo Abeni
3392e9d09bacSPaolo Abeni for (;;) {
3393877a72e3SPaolo Abeni unsigned long flags = (msk->cb_flags & MPTCP_FLAGS_PROCESS_CTX_NEED);
339456a666c4SPaolo Abeni struct list_head join_list;
339556a666c4SPaolo Abeni
3396c2e6048fSPaolo Abeni if (!flags)
3397c2e6048fSPaolo Abeni break;
3398c2e6048fSPaolo Abeni
339956a666c4SPaolo Abeni INIT_LIST_HEAD(&join_list);
340056a666c4SPaolo Abeni list_splice_init(&msk->join_list, &join_list);
340156a666c4SPaolo Abeni
3402c2e6048fSPaolo Abeni /* the following actions acquire the subflow socket lock
34036e628cd3SPaolo Abeni *
34046e628cd3SPaolo Abeni * 1) can't be invoked in atomic scope
34056e628cd3SPaolo Abeni * 2) must avoid ABBA deadlock with msk socket spinlock: the RX
34066e628cd3SPaolo Abeni * datapath acquires the msk socket spinlock while helding
34076e628cd3SPaolo Abeni * the subflow socket lock
34086e628cd3SPaolo Abeni */
3409e9d09bacSPaolo Abeni msk->cb_flags &= ~flags;
34106e628cd3SPaolo Abeni spin_unlock_bh(&sk->sk_lock.slock);
341156a666c4SPaolo Abeni
34123e501490SPaolo Abeni if (flags & BIT(MPTCP_FLUSH_JOIN_LIST))
341356a666c4SPaolo Abeni __mptcp_flush_join_list(sk, &join_list);
34142e5de7e0SDan Carpenter if (flags & BIT(MPTCP_PUSH_PENDING))
3415c2e6048fSPaolo Abeni __mptcp_push_pending(sk, 0);
34162d6f5a2bSPaolo Abeni if (flags & BIT(MPTCP_RETRANSMIT))
34172d6f5a2bSPaolo Abeni __mptcp_retrans(sk);
3418c2e6048fSPaolo Abeni
3419c2e6048fSPaolo Abeni cond_resched();
34206e628cd3SPaolo Abeni spin_lock_bh(&sk->sk_lock.slock);
34216e628cd3SPaolo Abeni }
3422c2e6048fSPaolo Abeni
342365a569b0SPaolo Abeni if (__test_and_clear_bit(MPTCP_CLEAN_UNA, &msk->cb_flags))
342465a569b0SPaolo Abeni __mptcp_clean_una_wakeup(sk);
342517ebf8a4SXiang Yang if (unlikely(msk->cb_flags)) {
3426cf742d09SPaolo Abeni /* be sure to sync the msk state before taking actions
342744ee4764SPaolo Abeni * depending on sk_state (MPTCP_ERROR_REPORT)
342844ee4764SPaolo Abeni * On sk release avoid actions depending on the first subflow
3429490274b4SPaolo Abeni */
3430cf742d09SPaolo Abeni if (__test_and_clear_bit(MPTCP_SYNC_STATE, &msk->cb_flags) && msk->first)
3431cf742d09SPaolo Abeni __mptcp_sync_state(sk, msk->pending_state);
3432e9d09bacSPaolo Abeni if (__test_and_clear_bit(MPTCP_ERROR_REPORT, &msk->cb_flags))
343315cc1045SPaolo Abeni __mptcp_error_report(sk);
343434c7757aSPaolo Abeni if (__test_and_clear_bit(MPTCP_SYNC_SNDBUF, &msk->cb_flags))
343534c7757aSPaolo Abeni __mptcp_sync_sndbuf(sk);
343665a569b0SPaolo Abeni }
34376e628cd3SPaolo Abeni
343887952603SPaolo Abeni __mptcp_update_rmem(sk);
343914c441b5SPaolo Abeni }
344014c441b5SPaolo Abeni
3441bcd97734SPaolo Abeni /* MP_JOIN client subflow must wait for 4th ack before sending any data:
3442bcd97734SPaolo Abeni * TCP can't schedule delack timer before the subflow is fully established.
3443bcd97734SPaolo Abeni * MPTCP uses the delack timer to do 3rd ack retransmissions
3444bcd97734SPaolo Abeni */
schedule_3rdack_retransmission(struct sock * ssk)3445bcd97734SPaolo Abeni static void schedule_3rdack_retransmission(struct sock *ssk)
3446bcd97734SPaolo Abeni {
3447bcd97734SPaolo Abeni struct inet_connection_sock *icsk = inet_csk(ssk);
3448bcd97734SPaolo Abeni struct tcp_sock *tp = tcp_sk(ssk);
3449bcd97734SPaolo Abeni unsigned long timeout;
3450bcd97734SPaolo Abeni
3451bcd97734SPaolo Abeni if (mptcp_subflow_ctx(ssk)->fully_established)
3452bcd97734SPaolo Abeni return;
3453bcd97734SPaolo Abeni
3454bcd97734SPaolo Abeni /* reschedule with a timeout above RTT, as we must look only for drop */
3455bcd97734SPaolo Abeni if (tp->srtt_us)
3456bcd97734SPaolo Abeni timeout = usecs_to_jiffies(tp->srtt_us >> (3 - 1));
3457bcd97734SPaolo Abeni else
3458bcd97734SPaolo Abeni timeout = TCP_TIMEOUT_INIT;
3459bcd97734SPaolo Abeni timeout += jiffies;
3460bcd97734SPaolo Abeni
3461bcd97734SPaolo Abeni WARN_ON_ONCE(icsk->icsk_ack.pending & ICSK_ACK_TIMER);
3462bcd97734SPaolo Abeni icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER;
3463bcd97734SPaolo Abeni icsk->icsk_ack.timeout = timeout;
3464bcd97734SPaolo Abeni sk_reset_timer(ssk, &icsk->icsk_delack_timer, timeout);
3465bcd97734SPaolo Abeni }
3466bcd97734SPaolo Abeni
mptcp_subflow_process_delegated(struct sock * ssk,long status)3467a5efdbceSPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk, long status)
3468b19bc294SPaolo Abeni {
3469b19bc294SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
3470b19bc294SPaolo Abeni struct sock *sk = subflow->conn;
3471b19bc294SPaolo Abeni
3472a5efdbceSPaolo Abeni if (status & BIT(MPTCP_DELEGATE_SEND)) {
3473b19bc294SPaolo Abeni mptcp_data_lock(sk);
3474b19bc294SPaolo Abeni if (!sock_owned_by_user(sk))
347573a0052aSGeliang Tang __mptcp_subflow_push_pending(sk, ssk, true);
3476b19bc294SPaolo Abeni else
3477e9d09bacSPaolo Abeni __set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->cb_flags);
3478b19bc294SPaolo Abeni mptcp_data_unlock(sk);
3479bcd97734SPaolo Abeni }
348034c7757aSPaolo Abeni if (status & BIT(MPTCP_DELEGATE_SNDBUF)) {
348134c7757aSPaolo Abeni mptcp_data_lock(sk);
348234c7757aSPaolo Abeni if (!sock_owned_by_user(sk))
348334c7757aSPaolo Abeni __mptcp_sync_sndbuf(sk);
348434c7757aSPaolo Abeni else
348534c7757aSPaolo Abeni __set_bit(MPTCP_SYNC_SNDBUF, &mptcp_sk(sk)->cb_flags);
348634c7757aSPaolo Abeni mptcp_data_unlock(sk);
348734c7757aSPaolo Abeni }
3488a5efdbceSPaolo Abeni if (status & BIT(MPTCP_DELEGATE_ACK))
3489bcd97734SPaolo Abeni schedule_3rdack_retransmission(ssk);
3490b19bc294SPaolo Abeni }
3491b19bc294SPaolo Abeni
mptcp_hash(struct sock * sk)34922c5ebd00SPaolo Abeni static int mptcp_hash(struct sock *sk)
34932c5ebd00SPaolo Abeni {
34942c5ebd00SPaolo Abeni /* should never be called,
34952c5ebd00SPaolo Abeni * we hash the TCP subflows not the master socket
34962c5ebd00SPaolo Abeni */
34972c5ebd00SPaolo Abeni WARN_ON_ONCE(1);
34982c5ebd00SPaolo Abeni return 0;
34992c5ebd00SPaolo Abeni }
35002c5ebd00SPaolo Abeni
mptcp_unhash(struct sock * sk)35012c5ebd00SPaolo Abeni static void mptcp_unhash(struct sock *sk)
35022c5ebd00SPaolo Abeni {
35032c5ebd00SPaolo Abeni /* called from sk_common_release(), but nothing to do here */
35042c5ebd00SPaolo Abeni }
35052c5ebd00SPaolo Abeni
mptcp_get_port(struct sock * sk,unsigned short snum)3506cec37a6eSPeter Krystad static int mptcp_get_port(struct sock *sk, unsigned short snum)
3507f870fa0bSMat Martineau {
3508f870fa0bSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk);
3509f870fa0bSMat Martineau
3510cfb63e50SPaolo Abeni pr_debug("msk=%p, ssk=%p", msk, msk->first);
3511cfb63e50SPaolo Abeni if (WARN_ON_ONCE(!msk->first))
3512cec37a6eSPeter Krystad return -EINVAL;
3513f870fa0bSMat Martineau
3514cfb63e50SPaolo Abeni return inet_csk_get_port(msk->first, snum);
3515cec37a6eSPeter Krystad }
3516f870fa0bSMat Martineau
mptcp_finish_connect(struct sock * ssk)3517cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *ssk)
3518cec37a6eSPeter Krystad {
3519cec37a6eSPeter Krystad struct mptcp_subflow_context *subflow;
3520cec37a6eSPeter Krystad struct mptcp_sock *msk;
3521cec37a6eSPeter Krystad struct sock *sk;
3522f870fa0bSMat Martineau
3523cec37a6eSPeter Krystad subflow = mptcp_subflow_ctx(ssk);
3524cec37a6eSPeter Krystad sk = subflow->conn;
3525cec37a6eSPeter Krystad msk = mptcp_sk(sk);
3526cec37a6eSPeter Krystad
3527648ef4b8SMat Martineau pr_debug("msk=%p, token=%u", sk, subflow->token);
3528648ef4b8SMat Martineau
3529b3ea6b27SPaolo Abeni subflow->map_seq = subflow->iasn;
3530648ef4b8SMat Martineau subflow->map_subflow_seq = 1;
35316d0060f6SMat Martineau
3532cec37a6eSPeter Krystad /* the socket is not connected yet, no msk/subflow ops can access/race
3533cec37a6eSPeter Krystad * accessing the field below
3534cec37a6eSPeter Krystad */
3535cec37a6eSPeter Krystad WRITE_ONCE(msk->local_key, subflow->local_key);
35361b1c7a0eSPeter Krystad
35376c714f1bSFlorian Westphal mptcp_pm_new_connection(msk, ssk, 0);
3538f870fa0bSMat Martineau }
3539f870fa0bSMat Martineau
mptcp_sock_graft(struct sock * sk,struct socket * parent)3540866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent)
3541cf7da0d6SPeter Krystad {
3542cf7da0d6SPeter Krystad write_lock_bh(&sk->sk_callback_lock);
3543cf7da0d6SPeter Krystad rcu_assign_pointer(sk->sk_wq, &parent->wq);
3544cf7da0d6SPeter Krystad sk_set_socket(sk, parent);
3545cf7da0d6SPeter Krystad sk->sk_uid = SOCK_INODE(parent)->i_uid;
3546cf7da0d6SPeter Krystad write_unlock_bh(&sk->sk_callback_lock);
3547cf7da0d6SPeter Krystad }
3548cf7da0d6SPeter Krystad
mptcp_finish_join(struct sock * ssk)3549e16163b6SPaolo Abeni bool mptcp_finish_join(struct sock *ssk)
3550f296234cSPeter Krystad {
3551e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
3552f296234cSPeter Krystad struct mptcp_sock *msk = mptcp_sk(subflow->conn);
3553f296234cSPeter Krystad struct sock *parent = (void *)msk;
35543e501490SPaolo Abeni bool ret = true;
3555f296234cSPeter Krystad
3556f296234cSPeter Krystad pr_debug("msk=%p, subflow=%p", msk, subflow);
3557f296234cSPeter Krystad
3558f296234cSPeter Krystad /* mptcp socket already closing? */
3559dc87efdbSFlorian Westphal if (!mptcp_is_fully_established(parent)) {
3560dc87efdbSFlorian Westphal subflow->reset_reason = MPTCP_RST_EMPTCP;
3561f296234cSPeter Krystad return false;
3562dc87efdbSFlorian Westphal }
3563f296234cSPeter Krystad
356455b47ca7SPaolo Abeni /* active subflow, already present inside the conn_list */
356555b47ca7SPaolo Abeni if (!list_empty(&subflow->node)) {
356655b47ca7SPaolo Abeni mptcp_subflow_joined(msk, ssk);
356734c7757aSPaolo Abeni mptcp_propagate_sndbuf(parent, ssk);
356855b47ca7SPaolo Abeni return true;
356955b47ca7SPaolo Abeni }
3570f296234cSPeter Krystad
35713e501490SPaolo Abeni if (!mptcp_pm_allow_new_subflow(msk))
35723e501490SPaolo Abeni goto err_prohibited;
357310f6d46cSPaolo Abeni
357455b47ca7SPaolo Abeni /* If we can't acquire msk socket lock here, let the release callback
35753e501490SPaolo Abeni * handle it
357610f6d46cSPaolo Abeni */
35773e501490SPaolo Abeni mptcp_data_lock(parent);
35783e501490SPaolo Abeni if (!sock_owned_by_user(parent)) {
35793e501490SPaolo Abeni ret = __mptcp_finish_join(msk, ssk);
35803e501490SPaolo Abeni if (ret) {
3581e16163b6SPaolo Abeni sock_hold(ssk);
35823e501490SPaolo Abeni list_add_tail(&subflow->node, &msk->conn_list);
3583e16163b6SPaolo Abeni }
35843e501490SPaolo Abeni } else {
35853e501490SPaolo Abeni sock_hold(ssk);
35863e501490SPaolo Abeni list_add_tail(&subflow->node, &msk->join_list);
3587e9d09bacSPaolo Abeni __set_bit(MPTCP_FLUSH_JOIN_LIST, &msk->cb_flags);
35883e501490SPaolo Abeni }
35893e501490SPaolo Abeni mptcp_data_unlock(parent);
35903e501490SPaolo Abeni
3591dc87efdbSFlorian Westphal if (!ret) {
35923e501490SPaolo Abeni err_prohibited:
3593dc87efdbSFlorian Westphal subflow->reset_reason = MPTCP_RST_EPROHIBIT;
359410f6d46cSPaolo Abeni return false;
3595dc87efdbSFlorian Westphal }
359610f6d46cSPaolo Abeni
359710f6d46cSPaolo Abeni return true;
3598f296234cSPeter Krystad }
3599f296234cSPeter Krystad
mptcp_shutdown(struct sock * sk,int how)360076e2a55dSPaolo Abeni static void mptcp_shutdown(struct sock *sk, int how)
360176e2a55dSPaolo Abeni {
360276e2a55dSPaolo Abeni pr_debug("sk=%p, how=%d", sk, how);
360376e2a55dSPaolo Abeni
360476e2a55dSPaolo Abeni if ((how & SEND_SHUTDOWN) && mptcp_close_state(sk))
360576e2a55dSPaolo Abeni __mptcp_wr_shutdown(sk);
360676e2a55dSPaolo Abeni }
360776e2a55dSPaolo Abeni
mptcp_forward_alloc_get(const struct sock * sk)36086511882cSPaolo Abeni static int mptcp_forward_alloc_get(const struct sock *sk)
36096511882cSPaolo Abeni {
36109531e4a8SEric Dumazet return READ_ONCE(sk->sk_forward_alloc) +
36119531e4a8SEric Dumazet READ_ONCE(mptcp_sk(sk)->rmem_fwd_alloc);
36126511882cSPaolo Abeni }
36136511882cSPaolo Abeni
mptcp_ioctl_outq(const struct mptcp_sock * msk,u64 v)3614644807e3SFlorian Westphal static int mptcp_ioctl_outq(const struct mptcp_sock *msk, u64 v)
3615644807e3SFlorian Westphal {
3616644807e3SFlorian Westphal const struct sock *sk = (void *)msk;
3617644807e3SFlorian Westphal u64 delta;
3618644807e3SFlorian Westphal
3619644807e3SFlorian Westphal if (sk->sk_state == TCP_LISTEN)
3620644807e3SFlorian Westphal return -EINVAL;
3621644807e3SFlorian Westphal
3622644807e3SFlorian Westphal if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
3623644807e3SFlorian Westphal return 0;
3624644807e3SFlorian Westphal
3625644807e3SFlorian Westphal delta = msk->write_seq - v;
362607c2c7a3SPaolo Abeni if (__mptcp_check_fallback(msk) && msk->first) {
362707c2c7a3SPaolo Abeni struct tcp_sock *tp = tcp_sk(msk->first);
362807c2c7a3SPaolo Abeni
362907c2c7a3SPaolo Abeni /* the first subflow is disconnected after close - see
363007c2c7a3SPaolo Abeni * __mptcp_close_ssk(). tcp_disconnect() moves the write_seq
363107c2c7a3SPaolo Abeni * so ignore that status, too.
363207c2c7a3SPaolo Abeni */
363307c2c7a3SPaolo Abeni if (!((1 << msk->first->sk_state) &
363407c2c7a3SPaolo Abeni (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)))
363507c2c7a3SPaolo Abeni delta += READ_ONCE(tp->write_seq) - tp->snd_una;
363607c2c7a3SPaolo Abeni }
3637644807e3SFlorian Westphal if (delta > INT_MAX)
3638644807e3SFlorian Westphal delta = INT_MAX;
3639644807e3SFlorian Westphal
3640644807e3SFlorian Westphal return (int)delta;
3641644807e3SFlorian Westphal }
3642644807e3SFlorian Westphal
mptcp_ioctl(struct sock * sk,int cmd,int * karg)3643e1d001faSBreno Leitao static int mptcp_ioctl(struct sock *sk, int cmd, int *karg)
3644644807e3SFlorian Westphal {
3645644807e3SFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk);
3646644807e3SFlorian Westphal bool slow;
3647644807e3SFlorian Westphal
3648644807e3SFlorian Westphal switch (cmd) {
3649644807e3SFlorian Westphal case SIOCINQ:
3650644807e3SFlorian Westphal if (sk->sk_state == TCP_LISTEN)
3651644807e3SFlorian Westphal return -EINVAL;
3652644807e3SFlorian Westphal
3653644807e3SFlorian Westphal lock_sock(sk);
3654644807e3SFlorian Westphal __mptcp_move_skbs(msk);
3655e1d001faSBreno Leitao *karg = mptcp_inq_hint(sk);
3656644807e3SFlorian Westphal release_sock(sk);
3657644807e3SFlorian Westphal break;
3658644807e3SFlorian Westphal case SIOCOUTQ:
3659644807e3SFlorian Westphal slow = lock_sock_fast(sk);
3660e1d001faSBreno Leitao *karg = mptcp_ioctl_outq(msk, READ_ONCE(msk->snd_una));
3661644807e3SFlorian Westphal unlock_sock_fast(sk, slow);
3662644807e3SFlorian Westphal break;
3663644807e3SFlorian Westphal case SIOCOUTQNSD:
3664644807e3SFlorian Westphal slow = lock_sock_fast(sk);
3665e1d001faSBreno Leitao *karg = mptcp_ioctl_outq(msk, msk->snd_nxt);
3666644807e3SFlorian Westphal unlock_sock_fast(sk, slow);
3667644807e3SFlorian Westphal break;
3668644807e3SFlorian Westphal default:
3669644807e3SFlorian Westphal return -ENOIOCTLCMD;
3670644807e3SFlorian Westphal }
3671644807e3SFlorian Westphal
3672e1d001faSBreno Leitao return 0;
3673644807e3SFlorian Westphal }
3674644807e3SFlorian Westphal
mptcp_subflow_early_fallback(struct mptcp_sock * msk,struct mptcp_subflow_context * subflow)367554f1944eSPaolo Abeni static void mptcp_subflow_early_fallback(struct mptcp_sock *msk,
367654f1944eSPaolo Abeni struct mptcp_subflow_context *subflow)
367754f1944eSPaolo Abeni {
367854f1944eSPaolo Abeni subflow->request_mptcp = 0;
367954f1944eSPaolo Abeni __mptcp_do_fallback(msk);
368054f1944eSPaolo Abeni }
368154f1944eSPaolo Abeni
mptcp_connect(struct sock * sk,struct sockaddr * uaddr,int addr_len)368254f1944eSPaolo Abeni static int mptcp_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
368354f1944eSPaolo Abeni {
368454f1944eSPaolo Abeni struct mptcp_subflow_context *subflow;
368554f1944eSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk);
368654f1944eSPaolo Abeni int err = -EINVAL;
3687ccae357cSPaolo Abeni struct sock *ssk;
368854f1944eSPaolo Abeni
36893f326a82SPaolo Abeni ssk = __mptcp_nmpc_sk(msk);
36903f326a82SPaolo Abeni if (IS_ERR(ssk))
36913f326a82SPaolo Abeni return PTR_ERR(ssk);
369254f1944eSPaolo Abeni
3693d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_SYN_SENT);
3694ccae357cSPaolo Abeni subflow = mptcp_subflow_ctx(ssk);
369554f1944eSPaolo Abeni #ifdef CONFIG_TCP_MD5SIG
369654f1944eSPaolo Abeni /* no MPTCP if MD5SIG is enabled on this socket or we may run out of
369754f1944eSPaolo Abeni * TCP option space.
369854f1944eSPaolo Abeni */
3699ccae357cSPaolo Abeni if (rcu_access_pointer(tcp_sk(ssk)->md5sig_info))
370054f1944eSPaolo Abeni mptcp_subflow_early_fallback(msk, subflow);
370154f1944eSPaolo Abeni #endif
3702ccae357cSPaolo Abeni if (subflow->request_mptcp && mptcp_token_new_connect(ssk)) {
3703ccae357cSPaolo Abeni MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_TOKENFALLBACKINIT);
370454f1944eSPaolo Abeni mptcp_subflow_early_fallback(msk, subflow);
370554f1944eSPaolo Abeni }
3706aa0c07c1SPaolo Abeni
3707aa0c07c1SPaolo Abeni WRITE_ONCE(msk->write_seq, subflow->idsn);
3708aa0c07c1SPaolo Abeni WRITE_ONCE(msk->snd_nxt, subflow->idsn);
3709f1f0a46fSPaolo Abeni WRITE_ONCE(msk->snd_una, subflow->idsn);
371054f1944eSPaolo Abeni if (likely(!__mptcp_check_fallback(msk)))
371154f1944eSPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEACTIVE);
371254f1944eSPaolo Abeni
371354f1944eSPaolo Abeni /* if reaching here via the fastopen/sendmsg path, the caller already
371454f1944eSPaolo Abeni * acquired the subflow socket lock, too.
371554f1944eSPaolo Abeni */
3716ccae357cSPaolo Abeni if (!msk->fastopening)
3717ccae357cSPaolo Abeni lock_sock(ssk);
3718ccae357cSPaolo Abeni
3719ccae357cSPaolo Abeni /* the following mirrors closely a very small chunk of code from
3720ccae357cSPaolo Abeni * __inet_stream_connect()
3721ccae357cSPaolo Abeni */
3722ccae357cSPaolo Abeni if (ssk->sk_state != TCP_CLOSE)
3723ccae357cSPaolo Abeni goto out;
3724ccae357cSPaolo Abeni
3725ccae357cSPaolo Abeni if (BPF_CGROUP_PRE_CONNECT_ENABLED(ssk)) {
3726ccae357cSPaolo Abeni err = ssk->sk_prot->pre_connect(ssk, uaddr, addr_len);
3727ccae357cSPaolo Abeni if (err)
3728ccae357cSPaolo Abeni goto out;
3729ccae357cSPaolo Abeni }
3730ccae357cSPaolo Abeni
3731ccae357cSPaolo Abeni err = ssk->sk_prot->connect(ssk, uaddr, addr_len);
3732ccae357cSPaolo Abeni if (err < 0)
3733ccae357cSPaolo Abeni goto out;
3734ccae357cSPaolo Abeni
373508e39c0dSEric Dumazet inet_assign_bit(DEFER_CONNECT, sk, inet_test_bit(DEFER_CONNECT, ssk));
3736ccae357cSPaolo Abeni
3737ccae357cSPaolo Abeni out:
3738ccae357cSPaolo Abeni if (!msk->fastopening)
3739ccae357cSPaolo Abeni release_sock(ssk);
374054f1944eSPaolo Abeni
374154f1944eSPaolo Abeni /* on successful connect, the msk state will be moved to established by
374254f1944eSPaolo Abeni * subflow_finish_connect()
374354f1944eSPaolo Abeni */
3744ccae357cSPaolo Abeni if (unlikely(err)) {
3745131a6277SPaolo Abeni /* avoid leaving a dangling token in an unconnected socket */
3746131a6277SPaolo Abeni mptcp_token_destroy(msk);
3747d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_CLOSE);
374854f1944eSPaolo Abeni return err;
374954f1944eSPaolo Abeni }
375054f1944eSPaolo Abeni
3751ccae357cSPaolo Abeni mptcp_copy_inaddrs(sk, ssk);
3752786fc124SPaolo Abeni return 0;
375354f1944eSPaolo Abeni }
375454f1944eSPaolo Abeni
3755f870fa0bSMat Martineau static struct proto mptcp_prot = {
3756f870fa0bSMat Martineau .name = "MPTCP",
3757f870fa0bSMat Martineau .owner = THIS_MODULE,
3758f870fa0bSMat Martineau .init = mptcp_init_sock,
375954f1944eSPaolo Abeni .connect = mptcp_connect,
376018b683bfSPaolo Abeni .disconnect = mptcp_disconnect,
3761f870fa0bSMat Martineau .close = mptcp_close,
3762717e79c8SPeter Krystad .setsockopt = mptcp_setsockopt,
3763717e79c8SPeter Krystad .getsockopt = mptcp_getsockopt,
376476e2a55dSPaolo Abeni .shutdown = mptcp_shutdown,
376579c0949eSPeter Krystad .destroy = mptcp_destroy,
3766f870fa0bSMat Martineau .sendmsg = mptcp_sendmsg,
3767644807e3SFlorian Westphal .ioctl = mptcp_ioctl,
3768f870fa0bSMat Martineau .recvmsg = mptcp_recvmsg,
376914c441b5SPaolo Abeni .release_cb = mptcp_release_cb,
37702c5ebd00SPaolo Abeni .hash = mptcp_hash,
37712c5ebd00SPaolo Abeni .unhash = mptcp_unhash,
3772cec37a6eSPeter Krystad .get_port = mptcp_get_port,
37736511882cSPaolo Abeni .forward_alloc_get = mptcp_forward_alloc_get,
3774d027236cSPaolo Abeni .sockets_allocated = &mptcp_sockets_allocated,
37750defbb0aSEric Dumazet
3776d027236cSPaolo Abeni .memory_allocated = &tcp_memory_allocated,
37770defbb0aSEric Dumazet .per_cpu_fw_alloc = &tcp_memory_per_cpu_fw_alloc,
37780defbb0aSEric Dumazet
3779d027236cSPaolo Abeni .memory_pressure = &tcp_memory_pressure,
3780d027236cSPaolo Abeni .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem),
3781989ef49bSPaolo Abeni .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem),
3782d027236cSPaolo Abeni .sysctl_mem = sysctl_tcp_mem,
3783f870fa0bSMat Martineau .obj_size = sizeof(struct mptcp_sock),
37842c5ebd00SPaolo Abeni .slab_flags = SLAB_TYPESAFE_BY_RCU,
3785f870fa0bSMat Martineau .no_autobind = true,
3786f870fa0bSMat Martineau };
3787f870fa0bSMat Martineau
mptcp_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)37882303f994SPeter Krystad static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
37892303f994SPeter Krystad {
37902303f994SPeter Krystad struct mptcp_sock *msk = mptcp_sk(sock->sk);
37918cf2ebdcSPaolo Abeni struct sock *ssk, *sk = sock->sk;
37928cf2ebdcSPaolo Abeni int err = -EINVAL;
37932303f994SPeter Krystad
37948cf2ebdcSPaolo Abeni lock_sock(sk);
37953f326a82SPaolo Abeni ssk = __mptcp_nmpc_sk(msk);
37963f326a82SPaolo Abeni if (IS_ERR(ssk)) {
37973f326a82SPaolo Abeni err = PTR_ERR(ssk);
37982303f994SPeter Krystad goto unlock;
37992303f994SPeter Krystad }
38002303f994SPeter Krystad
38018cf2ebdcSPaolo Abeni if (sk->sk_family == AF_INET)
38028cf2ebdcSPaolo Abeni err = inet_bind_sk(ssk, uaddr, addr_len);
38038cf2ebdcSPaolo Abeni #if IS_ENABLED(CONFIG_MPTCP_IPV6)
38048cf2ebdcSPaolo Abeni else if (sk->sk_family == AF_INET6)
38058cf2ebdcSPaolo Abeni err = inet6_bind_sk(ssk, uaddr, addr_len);
38068cf2ebdcSPaolo Abeni #endif
3807cf7da0d6SPeter Krystad if (!err)
38088cf2ebdcSPaolo Abeni mptcp_copy_inaddrs(sk, ssk);
38092303f994SPeter Krystad
38102303f994SPeter Krystad unlock:
38118cf2ebdcSPaolo Abeni release_sock(sk);
38122303f994SPeter Krystad return err;
38132303f994SPeter Krystad }
38142303f994SPeter Krystad
mptcp_listen(struct socket * sock,int backlog)3815cf7da0d6SPeter Krystad static int mptcp_listen(struct socket *sock, int backlog)
3816cf7da0d6SPeter Krystad {
3817cf7da0d6SPeter Krystad struct mptcp_sock *msk = mptcp_sk(sock->sk);
3818cfdcfeedSMenglong Dong struct sock *sk = sock->sk;
381940f56d0cSPaolo Abeni struct sock *ssk;
3820cf7da0d6SPeter Krystad int err;
3821cf7da0d6SPeter Krystad
3822cf7da0d6SPeter Krystad pr_debug("msk=%p", msk);
3823cf7da0d6SPeter Krystad
3824cfdcfeedSMenglong Dong lock_sock(sk);
38250226436aSPaolo Abeni
38260226436aSPaolo Abeni err = -EINVAL;
38270226436aSPaolo Abeni if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
38280226436aSPaolo Abeni goto unlock;
38290226436aSPaolo Abeni
38303f326a82SPaolo Abeni ssk = __mptcp_nmpc_sk(msk);
38313f326a82SPaolo Abeni if (IS_ERR(ssk)) {
38323f326a82SPaolo Abeni err = PTR_ERR(ssk);
3833cf7da0d6SPeter Krystad goto unlock;
3834cf7da0d6SPeter Krystad }
3835cf7da0d6SPeter Krystad
3836d52b3c2bSGeliang Tang mptcp_set_state(sk, TCP_LISTEN);
3837cfdcfeedSMenglong Dong sock_set_flag(sk, SOCK_RCU_FREE);
38385e20087dSFlorian Westphal
383940f56d0cSPaolo Abeni lock_sock(ssk);
384040f56d0cSPaolo Abeni err = __inet_listen_sk(ssk, backlog);
384140f56d0cSPaolo Abeni release_sock(ssk);
3842d52b3c2bSGeliang Tang mptcp_set_state(sk, inet_sk_state_load(ssk));
384340f56d0cSPaolo Abeni
3844c558246eSMenglong Dong if (!err) {
3845c558246eSMenglong Dong sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
384640f56d0cSPaolo Abeni mptcp_copy_inaddrs(sk, ssk);
384740f56d0cSPaolo Abeni mptcp_event_pm_listener(ssk, MPTCP_EVENT_LISTENER_CREATED);
384821d9b73aSPaolo Abeni }
3849f8c9dfbdSGeliang Tang
3850cf7da0d6SPeter Krystad unlock:
3851cfdcfeedSMenglong Dong release_sock(sk);
3852cf7da0d6SPeter Krystad return err;
3853cf7da0d6SPeter Krystad }
3854cf7da0d6SPeter Krystad
mptcp_stream_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)3855cf7da0d6SPeter Krystad static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
3856cf7da0d6SPeter Krystad int flags, bool kern)
3857cf7da0d6SPeter Krystad {
3858cf7da0d6SPeter Krystad struct mptcp_sock *msk = mptcp_sk(sock->sk);
38591f6610b9SPaolo Abeni struct sock *ssk, *newsk;
3860cf7da0d6SPeter Krystad int err;
3861cf7da0d6SPeter Krystad
3862cf7da0d6SPeter Krystad pr_debug("msk=%p", msk);
3863cf7da0d6SPeter Krystad
38645b825727SPaolo Abeni /* Buggy applications can call accept on socket states other then LISTEN
386561761231SPaolo Abeni * but no need to allocate the first subflow just to error out.
386661761231SPaolo Abeni */
38671f6610b9SPaolo Abeni ssk = READ_ONCE(msk->first);
38681f6610b9SPaolo Abeni if (!ssk)
386971ba088cSPaolo Abeni return -EINVAL;
3870cf7da0d6SPeter Krystad
387112f353faSDavide Caratti pr_debug("ssk=%p, listener=%p", ssk, mptcp_subflow_ctx(ssk));
387212f353faSDavide Caratti newsk = inet_csk_accept(ssk, flags, &err, kern);
3873e76c8ef5SPaolo Abeni if (!newsk)
3874e76c8ef5SPaolo Abeni return err;
3875e76c8ef5SPaolo Abeni
387612f353faSDavide Caratti pr_debug("newsk=%p, subflow is mptcp=%d", newsk, sk_is_mptcp(newsk));
387712f353faSDavide Caratti if (sk_is_mptcp(newsk)) {
3878cf7da0d6SPeter Krystad struct mptcp_subflow_context *subflow;
387912f353faSDavide Caratti struct sock *new_mptcp_sock;
388012f353faSDavide Caratti
388112f353faSDavide Caratti subflow = mptcp_subflow_ctx(newsk);
388212f353faSDavide Caratti new_mptcp_sock = subflow->conn;
388312f353faSDavide Caratti
388412f353faSDavide Caratti /* is_mptcp should be false if subflow->conn is missing, see
388512f353faSDavide Caratti * subflow_syn_recv_sock()
388612f353faSDavide Caratti */
388712f353faSDavide Caratti if (WARN_ON_ONCE(!new_mptcp_sock)) {
388812f353faSDavide Caratti tcp_sk(newsk)->is_mptcp = 0;
388912f353faSDavide Caratti goto tcpfallback;
389012f353faSDavide Caratti }
389112f353faSDavide Caratti
389212f353faSDavide Caratti newsk = new_mptcp_sock;
389312f353faSDavide Caratti MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_MPCAPABLEPASSIVEACK);
389412f353faSDavide Caratti
389512f353faSDavide Caratti newsk->sk_kern_sock = kern;
389612f353faSDavide Caratti lock_sock(newsk);
389712f353faSDavide Caratti __inet_accept(sock, newsock, newsk);
38980397c6d8SPaolo Abeni
3899a5ef058dSPaolo Abeni set_bit(SOCK_CUSTOM_SOCKOPT, &newsock->flags);
390012f353faSDavide Caratti msk = mptcp_sk(newsk);
3901b6985b9bSPaolo Abeni msk->in_accept_queue = 0;
3902a5ef058dSPaolo Abeni
3903cf7da0d6SPeter Krystad /* set ssk->sk_socket of accept()ed flows to mptcp socket.
3904cf7da0d6SPeter Krystad * This is needed so NOSPACE flag can be set from tcp stack.
3905cf7da0d6SPeter Krystad */
3906190f8b06SGeliang Tang mptcp_for_each_subflow(msk, subflow) {
3907cf7da0d6SPeter Krystad struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
3908cf7da0d6SPeter Krystad
3909cf7da0d6SPeter Krystad if (!ssk->sk_socket)
3910cf7da0d6SPeter Krystad mptcp_sock_graft(ssk, newsock);
3911cf7da0d6SPeter Krystad }
391263740448SPaolo Abeni
391363740448SPaolo Abeni /* Do late cleanup for the first subflow as necessary. Also
391463740448SPaolo Abeni * deal with bad peers not doing a complete shutdown.
391563740448SPaolo Abeni */
391639880bd8SPaolo Abeni if (unlikely(inet_sk_state_load(msk->first) == TCP_CLOSE)) {
391763740448SPaolo Abeni __mptcp_close_ssk(newsk, msk->first,
391863740448SPaolo Abeni mptcp_subflow_ctx(msk->first), 0);
391939880bd8SPaolo Abeni if (unlikely(list_is_singular(&msk->conn_list)))
3920d52b3c2bSGeliang Tang mptcp_set_state(newsk, TCP_CLOSE);
392163740448SPaolo Abeni }
392212f353faSDavide Caratti } else {
392312f353faSDavide Caratti tcpfallback:
392412f353faSDavide Caratti newsk->sk_kern_sock = kern;
392512f353faSDavide Caratti lock_sock(newsk);
392612f353faSDavide Caratti __inet_accept(sock, newsock, newsk);
392712f353faSDavide Caratti /* we are being invoked after accepting a non-mp-capable
392812f353faSDavide Caratti * flow: sk is a tcp_sk, not an mptcp one.
392912f353faSDavide Caratti *
393012f353faSDavide Caratti * Hand the socket over to tcp so all further socket ops
393112f353faSDavide Caratti * bypass mptcp.
393212f353faSDavide Caratti */
393312f353faSDavide Caratti WRITE_ONCE(newsock->sk->sk_socket->ops,
393412f353faSDavide Caratti mptcp_fallback_tcp_ops(newsock->sk));
3935cf7da0d6SPeter Krystad }
3936e76c8ef5SPaolo Abeni release_sock(newsk);
3937cf7da0d6SPeter Krystad
3938e76c8ef5SPaolo Abeni return 0;
3939cf7da0d6SPeter Krystad }
3940cf7da0d6SPeter Krystad
mptcp_check_writeable(struct mptcp_sock * msk)39418edf0864SFlorian Westphal static __poll_t mptcp_check_writeable(struct mptcp_sock *msk)
39428edf0864SFlorian Westphal {
39438edf0864SFlorian Westphal struct sock *sk = (struct sock *)msk;
39448edf0864SFlorian Westphal
39458edf0864SFlorian Westphal if (sk_stream_is_writeable(sk))
39468edf0864SFlorian Westphal return EPOLLOUT | EPOLLWRNORM;
39478edf0864SFlorian Westphal
39485cf92bbaSPaolo Abeni mptcp_set_nospace(sk);
39496e628cd3SPaolo Abeni smp_mb__after_atomic(); /* msk->flags is changed by write_space cb */
39506e628cd3SPaolo Abeni if (sk_stream_is_writeable(sk))
39516e628cd3SPaolo Abeni return EPOLLOUT | EPOLLWRNORM;
39528edf0864SFlorian Westphal
39536e628cd3SPaolo Abeni return 0;
39548edf0864SFlorian Westphal }
39558edf0864SFlorian Westphal
mptcp_poll(struct file * file,struct socket * sock,struct poll_table_struct * wait)39562303f994SPeter Krystad static __poll_t mptcp_poll(struct file *file, struct socket *sock,
39572303f994SPeter Krystad struct poll_table_struct *wait)
39582303f994SPeter Krystad {
39591891c4a0SFlorian Westphal struct sock *sk = sock->sk;
39608ab183deSPaolo Abeni struct mptcp_sock *msk;
39612303f994SPeter Krystad __poll_t mask = 0;
39626b9831bfSPaolo Abeni u8 shutdown;
39638a05661bSPaolo Abeni int state;
39642303f994SPeter Krystad
39651891c4a0SFlorian Westphal msk = mptcp_sk(sk);
39661891c4a0SFlorian Westphal sock_poll_wait(file, sock, wait);
39671891c4a0SFlorian Westphal
39688a05661bSPaolo Abeni state = inet_sk_state_load(sk);
39696719331cSPaolo Abeni pr_debug("msk=%p state=%d flags=%lx", msk, state, msk->flags);
397071ba088cSPaolo Abeni if (state == TCP_LISTEN) {
39715426a4efSPaolo Abeni struct sock *ssk = READ_ONCE(msk->first);
39725b825727SPaolo Abeni
39735426a4efSPaolo Abeni if (WARN_ON_ONCE(!ssk))
397471ba088cSPaolo Abeni return 0;
397571ba088cSPaolo Abeni
39765426a4efSPaolo Abeni return inet_csk_listen_poll(ssk);
397771ba088cSPaolo Abeni }
39788a05661bSPaolo Abeni
39796b9831bfSPaolo Abeni shutdown = READ_ONCE(sk->sk_shutdown);
39806b9831bfSPaolo Abeni if (shutdown == SHUTDOWN_MASK || state == TCP_CLOSE)
39816b9831bfSPaolo Abeni mask |= EPOLLHUP;
39826b9831bfSPaolo Abeni if (shutdown & RCV_SHUTDOWN)
39836b9831bfSPaolo Abeni mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
39846b9831bfSPaolo Abeni
39858a05661bSPaolo Abeni if (state != TCP_SYN_SENT && state != TCP_SYN_RECV) {
39868a05661bSPaolo Abeni mask |= mptcp_check_readable(msk);
39876b9831bfSPaolo Abeni if (shutdown & SEND_SHUTDOWN)
39886b9831bfSPaolo Abeni mask |= EPOLLOUT | EPOLLWRNORM;
39896b9831bfSPaolo Abeni else
39908edf0864SFlorian Westphal mask |= mptcp_check_writeable(msk);
399108e39c0dSEric Dumazet } else if (state == TCP_SYN_SENT &&
399208e39c0dSEric Dumazet inet_test_bit(DEFER_CONNECT, sk)) {
3993a42cf9d1SBenjamin Hesmans /* cf tcp_poll() note about TFO */
3994a42cf9d1SBenjamin Hesmans mask |= EPOLLOUT | EPOLLWRNORM;
39958a05661bSPaolo Abeni }
39961891c4a0SFlorian Westphal
3997d89e3ed7SPaolo Abeni /* This barrier is coupled with smp_wmb() in __mptcp_error_report() */
399815cc1045SPaolo Abeni smp_rmb();
39999ae8e5adSEric Dumazet if (READ_ONCE(sk->sk_err))
400015cc1045SPaolo Abeni mask |= EPOLLERR;
400115cc1045SPaolo Abeni
40022303f994SPeter Krystad return mask;
40032303f994SPeter Krystad }
40042303f994SPeter Krystad
4005e42f1ac6SFlorian Westphal static const struct proto_ops mptcp_stream_ops = {
4006e42f1ac6SFlorian Westphal .family = PF_INET,
4007e42f1ac6SFlorian Westphal .owner = THIS_MODULE,
40080a3cc579SPaolo Abeni .release = inet_release,
4009e42f1ac6SFlorian Westphal .bind = mptcp_bind,
4010786fc124SPaolo Abeni .connect = inet_stream_connect,
4011e42f1ac6SFlorian Westphal .socketpair = sock_no_socketpair,
4012e42f1ac6SFlorian Westphal .accept = mptcp_stream_accept,
4013d2f77c53SPaolo Abeni .getname = inet_getname,
4014e42f1ac6SFlorian Westphal .poll = mptcp_poll,
4015e42f1ac6SFlorian Westphal .ioctl = inet_ioctl,
4016e42f1ac6SFlorian Westphal .gettstamp = sock_gettstamp,
4017e42f1ac6SFlorian Westphal .listen = mptcp_listen,
401876e2a55dSPaolo Abeni .shutdown = inet_shutdown,
4019e42f1ac6SFlorian Westphal .setsockopt = sock_common_setsockopt,
4020e42f1ac6SFlorian Westphal .getsockopt = sock_common_getsockopt,
4021e42f1ac6SFlorian Westphal .sendmsg = inet_sendmsg,
4022e42f1ac6SFlorian Westphal .recvmsg = inet_recvmsg,
4023e42f1ac6SFlorian Westphal .mmap = sock_no_mmap,
4024e42f1ac6SFlorian Westphal };
40252303f994SPeter Krystad
4026f870fa0bSMat Martineau static struct inet_protosw mptcp_protosw = {
4027f870fa0bSMat Martineau .type = SOCK_STREAM,
4028f870fa0bSMat Martineau .protocol = IPPROTO_MPTCP,
4029f870fa0bSMat Martineau .prot = &mptcp_prot,
40302303f994SPeter Krystad .ops = &mptcp_stream_ops,
40312303f994SPeter Krystad .flags = INET_PROTOSW_ICSK,
4032f870fa0bSMat Martineau };
4033f870fa0bSMat Martineau
mptcp_napi_poll(struct napi_struct * napi,int budget)4034b19bc294SPaolo Abeni static int mptcp_napi_poll(struct napi_struct *napi, int budget)
4035b19bc294SPaolo Abeni {
4036b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated;
4037b19bc294SPaolo Abeni struct mptcp_subflow_context *subflow;
4038b19bc294SPaolo Abeni int work_done = 0;
4039b19bc294SPaolo Abeni
4040b19bc294SPaolo Abeni delegated = container_of(napi, struct mptcp_delegated_action, napi);
4041b19bc294SPaolo Abeni while ((subflow = mptcp_subflow_delegated_next(delegated)) != NULL) {
4042b19bc294SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
4043b19bc294SPaolo Abeni
4044b19bc294SPaolo Abeni bh_lock_sock_nested(ssk);
4045a5efdbceSPaolo Abeni if (!sock_owned_by_user(ssk)) {
4046a5efdbceSPaolo Abeni mptcp_subflow_process_delegated(ssk, xchg(&subflow->delegated_status, 0));
4047a5efdbceSPaolo Abeni } else {
4048a5efdbceSPaolo Abeni /* tcp_release_cb_override already processed
4049b19bc294SPaolo Abeni * the action or will do at next release_sock().
4050b19bc294SPaolo Abeni * In both case must dequeue the subflow here - on the same
4051b19bc294SPaolo Abeni * CPU that scheduled it.
4052b19bc294SPaolo Abeni */
4053a5efdbceSPaolo Abeni smp_wmb();
4054a5efdbceSPaolo Abeni clear_bit(MPTCP_DELEGATE_SCHEDULED, &subflow->delegated_status);
4055a5efdbceSPaolo Abeni }
4056b19bc294SPaolo Abeni bh_unlock_sock(ssk);
4057b19bc294SPaolo Abeni sock_put(ssk);
4058b19bc294SPaolo Abeni
4059b19bc294SPaolo Abeni if (++work_done == budget)
4060b19bc294SPaolo Abeni return budget;
4061b19bc294SPaolo Abeni }
4062b19bc294SPaolo Abeni
4063b19bc294SPaolo Abeni /* always provide a 0 'work_done' argument, so that napi_complete_done
4064b19bc294SPaolo Abeni * will not try accessing the NULL napi->dev ptr
4065b19bc294SPaolo Abeni */
4066b19bc294SPaolo Abeni napi_complete_done(napi, 0);
4067b19bc294SPaolo Abeni return work_done;
4068b19bc294SPaolo Abeni }
4069b19bc294SPaolo Abeni
mptcp_proto_init(void)4070d39dcecaSPaolo Abeni void __init mptcp_proto_init(void)
4071f870fa0bSMat Martineau {
4072b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated;
4073b19bc294SPaolo Abeni int cpu;
4074b19bc294SPaolo Abeni
40752303f994SPeter Krystad mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo;
40762303f994SPeter Krystad
4077d027236cSPaolo Abeni if (percpu_counter_init(&mptcp_sockets_allocated, 0, GFP_KERNEL))
4078d027236cSPaolo Abeni panic("Failed to allocate MPTCP pcpu counter\n");
4079d027236cSPaolo Abeni
4080b19bc294SPaolo Abeni init_dummy_netdev(&mptcp_napi_dev);
4081b19bc294SPaolo Abeni for_each_possible_cpu(cpu) {
4082b19bc294SPaolo Abeni delegated = per_cpu_ptr(&mptcp_delegated_actions, cpu);
4083b19bc294SPaolo Abeni INIT_LIST_HEAD(&delegated->head);
408416d083e2SJakub Kicinski netif_napi_add_tx(&mptcp_napi_dev, &delegated->napi,
408516d083e2SJakub Kicinski mptcp_napi_poll);
4086b19bc294SPaolo Abeni napi_enable(&delegated->napi);
4087b19bc294SPaolo Abeni }
4088b19bc294SPaolo Abeni
40892303f994SPeter Krystad mptcp_subflow_init();
40901b1c7a0eSPeter Krystad mptcp_pm_init();
4091ed1ad86bSGeliang Tang mptcp_sched_init();
40922c5ebd00SPaolo Abeni mptcp_token_init();
40932303f994SPeter Krystad
4094f870fa0bSMat Martineau if (proto_register(&mptcp_prot, 1) != 0)
4095f870fa0bSMat Martineau panic("Failed to register MPTCP proto.\n");
4096f870fa0bSMat Martineau
4097f870fa0bSMat Martineau inet_register_protosw(&mptcp_protosw);
40986771bfd9SFlorian Westphal
40996771bfd9SFlorian Westphal BUILD_BUG_ON(sizeof(struct mptcp_skb_cb) > sizeof_field(struct sk_buff, cb));
4100f870fa0bSMat Martineau }
4101f870fa0bSMat Martineau
4102f870fa0bSMat Martineau #if IS_ENABLED(CONFIG_MPTCP_IPV6)
4103e42f1ac6SFlorian Westphal static const struct proto_ops mptcp_v6_stream_ops = {
4104e42f1ac6SFlorian Westphal .family = PF_INET6,
4105e42f1ac6SFlorian Westphal .owner = THIS_MODULE,
41060a3cc579SPaolo Abeni .release = inet6_release,
4107e42f1ac6SFlorian Westphal .bind = mptcp_bind,
4108786fc124SPaolo Abeni .connect = inet_stream_connect,
4109e42f1ac6SFlorian Westphal .socketpair = sock_no_socketpair,
4110e42f1ac6SFlorian Westphal .accept = mptcp_stream_accept,
4111d2f77c53SPaolo Abeni .getname = inet6_getname,
4112e42f1ac6SFlorian Westphal .poll = mptcp_poll,
4113e42f1ac6SFlorian Westphal .ioctl = inet6_ioctl,
4114e42f1ac6SFlorian Westphal .gettstamp = sock_gettstamp,
4115e42f1ac6SFlorian Westphal .listen = mptcp_listen,
411676e2a55dSPaolo Abeni .shutdown = inet_shutdown,
4117e42f1ac6SFlorian Westphal .setsockopt = sock_common_setsockopt,
4118e42f1ac6SFlorian Westphal .getsockopt = sock_common_getsockopt,
4119e42f1ac6SFlorian Westphal .sendmsg = inet6_sendmsg,
4120e42f1ac6SFlorian Westphal .recvmsg = inet6_recvmsg,
4121e42f1ac6SFlorian Westphal .mmap = sock_no_mmap,
4122e42f1ac6SFlorian Westphal #ifdef CONFIG_COMPAT
41233986912fSChristoph Hellwig .compat_ioctl = inet6_compat_ioctl,
4124e42f1ac6SFlorian Westphal #endif
4125e42f1ac6SFlorian Westphal };
4126e42f1ac6SFlorian Westphal
4127f870fa0bSMat Martineau static struct proto mptcp_v6_prot;
4128f870fa0bSMat Martineau
4129f870fa0bSMat Martineau static struct inet_protosw mptcp_v6_protosw = {
4130f870fa0bSMat Martineau .type = SOCK_STREAM,
4131f870fa0bSMat Martineau .protocol = IPPROTO_MPTCP,
4132f870fa0bSMat Martineau .prot = &mptcp_v6_prot,
41332303f994SPeter Krystad .ops = &mptcp_v6_stream_ops,
4134f870fa0bSMat Martineau .flags = INET_PROTOSW_ICSK,
4135f870fa0bSMat Martineau };
4136f870fa0bSMat Martineau
mptcp_proto_v6_init(void)4137d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void)
4138f870fa0bSMat Martineau {
4139f870fa0bSMat Martineau int err;
4140f870fa0bSMat Martineau
4141f870fa0bSMat Martineau mptcp_v6_prot = mptcp_prot;
4142f870fa0bSMat Martineau strcpy(mptcp_v6_prot.name, "MPTCPv6");
4143f870fa0bSMat Martineau mptcp_v6_prot.slab = NULL;
4144b0519de8SFlorian Westphal mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock);
4145f5f80e32SEric Dumazet mptcp_v6_prot.ipv6_pinfo_offset = offsetof(struct mptcp6_sock, np);
4146f870fa0bSMat Martineau
4147f870fa0bSMat Martineau err = proto_register(&mptcp_v6_prot, 1);
4148f870fa0bSMat Martineau if (err)
4149f870fa0bSMat Martineau return err;
4150f870fa0bSMat Martineau
4151f870fa0bSMat Martineau err = inet6_register_protosw(&mptcp_v6_protosw);
4152f870fa0bSMat Martineau if (err)
4153f870fa0bSMat Martineau proto_unregister(&mptcp_v6_prot);
4154f870fa0bSMat Martineau
4155f870fa0bSMat Martineau return err;
4156f870fa0bSMat Martineau }
4157f870fa0bSMat Martineau #endif
4158