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> 25f870fa0bSMat Martineau #include "protocol.h" 26fc518953SFlorian Westphal #include "mib.h" 27f870fa0bSMat Martineau 28e10a9892SGeliang Tang #define CREATE_TRACE_POINTS 29e10a9892SGeliang Tang #include <trace/events/mptcp.h> 30e10a9892SGeliang Tang 31b0519de8SFlorian Westphal #if IS_ENABLED(CONFIG_MPTCP_IPV6) 32b0519de8SFlorian Westphal struct mptcp6_sock { 33b0519de8SFlorian Westphal struct mptcp_sock msk; 34b0519de8SFlorian Westphal struct ipv6_pinfo np; 35b0519de8SFlorian Westphal }; 36b0519de8SFlorian Westphal #endif 37b0519de8SFlorian Westphal 386771bfd9SFlorian Westphal struct mptcp_skb_cb { 39ab174ad8SPaolo Abeni u64 map_seq; 40ab174ad8SPaolo Abeni u64 end_seq; 416771bfd9SFlorian Westphal u32 offset; 426771bfd9SFlorian Westphal }; 436771bfd9SFlorian Westphal 446771bfd9SFlorian Westphal #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 456771bfd9SFlorian Westphal 46d027236cSPaolo Abeni static struct percpu_counter mptcp_sockets_allocated; 47d027236cSPaolo Abeni 48e16163b6SPaolo Abeni static void __mptcp_destroy_sock(struct sock *sk); 49d9ca1de8SPaolo Abeni static void __mptcp_check_send_data_fin(struct sock *sk); 50e16163b6SPaolo Abeni 51b19bc294SPaolo Abeni DEFINE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 52b19bc294SPaolo Abeni static struct net_device mptcp_napi_dev; 53b19bc294SPaolo Abeni 542303f994SPeter Krystad /* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not 552303f994SPeter Krystad * completed yet or has failed, return the subflow socket. 562303f994SPeter Krystad * Otherwise return NULL. 572303f994SPeter Krystad */ 581729cf18SGeliang Tang struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk) 592303f994SPeter Krystad { 60d22f4988SChristoph Paasch if (!msk->subflow || READ_ONCE(msk->can_ack)) 612303f994SPeter Krystad return NULL; 622303f994SPeter Krystad 632303f994SPeter Krystad return msk->subflow; 642303f994SPeter Krystad } 652303f994SPeter Krystad 666f8a612aSFlorian Westphal /* Returns end sequence number of the receiver's advertised window */ 676f8a612aSFlorian Westphal static u64 mptcp_wnd_end(const struct mptcp_sock *msk) 686f8a612aSFlorian Westphal { 697439d687SPaolo Abeni return READ_ONCE(msk->wnd_end); 706f8a612aSFlorian Westphal } 716f8a612aSFlorian Westphal 72d2f77c53SPaolo Abeni static bool mptcp_is_tcpsk(struct sock *sk) 730b4f33deSFlorian Westphal { 740b4f33deSFlorian Westphal struct socket *sock = sk->sk_socket; 750b4f33deSFlorian Westphal 760b4f33deSFlorian Westphal if (unlikely(sk->sk_prot == &tcp_prot)) { 770b4f33deSFlorian Westphal /* we are being invoked after mptcp_accept() has 780b4f33deSFlorian Westphal * accepted a non-mp-capable flow: sk is a tcp_sk, 790b4f33deSFlorian Westphal * not an mptcp one. 800b4f33deSFlorian Westphal * 810b4f33deSFlorian Westphal * Hand the socket over to tcp so all further socket ops 820b4f33deSFlorian Westphal * bypass mptcp. 830b4f33deSFlorian Westphal */ 840b4f33deSFlorian Westphal sock->ops = &inet_stream_ops; 85d2f77c53SPaolo Abeni return true; 860b4f33deSFlorian Westphal #if IS_ENABLED(CONFIG_MPTCP_IPV6) 870b4f33deSFlorian Westphal } else if (unlikely(sk->sk_prot == &tcpv6_prot)) { 880b4f33deSFlorian Westphal sock->ops = &inet6_stream_ops; 89d2f77c53SPaolo Abeni return true; 900b4f33deSFlorian Westphal #endif 910b4f33deSFlorian Westphal } 920b4f33deSFlorian Westphal 93d2f77c53SPaolo Abeni return false; 940b4f33deSFlorian Westphal } 950b4f33deSFlorian Westphal 96fa68018dSPaolo Abeni static int __mptcp_socket_create(struct mptcp_sock *msk) 972303f994SPeter Krystad { 982303f994SPeter Krystad struct mptcp_subflow_context *subflow; 992303f994SPeter Krystad struct sock *sk = (struct sock *)msk; 1002303f994SPeter Krystad struct socket *ssock; 1012303f994SPeter Krystad int err; 1022303f994SPeter Krystad 1032303f994SPeter Krystad err = mptcp_subflow_create_socket(sk, &ssock); 1042303f994SPeter Krystad if (err) 105fa68018dSPaolo Abeni return err; 1062303f994SPeter Krystad 1078ab183deSPaolo Abeni msk->first = ssock->sk; 1082303f994SPeter Krystad msk->subflow = ssock; 1092303f994SPeter Krystad subflow = mptcp_subflow_ctx(ssock->sk); 110cec37a6eSPeter Krystad list_add(&subflow->node, &msk->conn_list); 111e16163b6SPaolo Abeni sock_hold(ssock->sk); 1122303f994SPeter Krystad subflow->request_mptcp = 1; 113866f26f2SPaolo Abeni mptcp_sock_graft(msk->first, sk->sk_socket); 114e1ff9e82SDavide Caratti 115fa68018dSPaolo Abeni return 0; 1162303f994SPeter Krystad } 1172303f994SPeter Krystad 118ab174ad8SPaolo Abeni static void mptcp_drop(struct sock *sk, struct sk_buff *skb) 119ab174ad8SPaolo Abeni { 120ab174ad8SPaolo Abeni sk_drops_add(sk, skb); 121ab174ad8SPaolo Abeni __kfree_skb(skb); 122ab174ad8SPaolo Abeni } 123ab174ad8SPaolo Abeni 1248268ed4cSPaolo Abeni static bool mptcp_try_coalesce(struct sock *sk, struct sk_buff *to, 1258268ed4cSPaolo Abeni struct sk_buff *from) 1268268ed4cSPaolo Abeni { 1278268ed4cSPaolo Abeni bool fragstolen; 1288268ed4cSPaolo Abeni int delta; 1298268ed4cSPaolo Abeni 1308268ed4cSPaolo Abeni if (MPTCP_SKB_CB(from)->offset || 1318268ed4cSPaolo Abeni !skb_try_coalesce(to, from, &fragstolen, &delta)) 1328268ed4cSPaolo Abeni return false; 1338268ed4cSPaolo Abeni 13406242e44SPaolo Abeni pr_debug("colesced seq %llx into %llx new len %d new end seq %llx", 13506242e44SPaolo Abeni MPTCP_SKB_CB(from)->map_seq, MPTCP_SKB_CB(to)->map_seq, 13606242e44SPaolo Abeni to->len, MPTCP_SKB_CB(from)->end_seq); 137ab174ad8SPaolo Abeni MPTCP_SKB_CB(to)->end_seq = MPTCP_SKB_CB(from)->end_seq; 1388268ed4cSPaolo Abeni kfree_skb_partial(from, fragstolen); 1398268ed4cSPaolo Abeni atomic_add(delta, &sk->sk_rmem_alloc); 1408268ed4cSPaolo Abeni sk_mem_charge(sk, delta); 1418268ed4cSPaolo Abeni return true; 1428268ed4cSPaolo Abeni } 1438268ed4cSPaolo Abeni 144ab174ad8SPaolo Abeni static bool mptcp_ooo_try_coalesce(struct mptcp_sock *msk, struct sk_buff *to, 145ab174ad8SPaolo Abeni struct sk_buff *from) 1466771bfd9SFlorian Westphal { 147ab174ad8SPaolo Abeni if (MPTCP_SKB_CB(from)->map_seq != MPTCP_SKB_CB(to)->end_seq) 148ab174ad8SPaolo Abeni return false; 149ab174ad8SPaolo Abeni 150ab174ad8SPaolo Abeni return mptcp_try_coalesce((struct sock *)msk, to, from); 151ab174ad8SPaolo Abeni } 152ab174ad8SPaolo Abeni 153ab174ad8SPaolo Abeni /* "inspired" by tcp_data_queue_ofo(), main differences: 154ab174ad8SPaolo Abeni * - use mptcp seqs 155ab174ad8SPaolo Abeni * - don't cope with sacks 156ab174ad8SPaolo Abeni */ 157ab174ad8SPaolo Abeni static void mptcp_data_queue_ofo(struct mptcp_sock *msk, struct sk_buff *skb) 158ab174ad8SPaolo Abeni { 159ab174ad8SPaolo Abeni struct sock *sk = (struct sock *)msk; 160ab174ad8SPaolo Abeni struct rb_node **p, *parent; 161ab174ad8SPaolo Abeni u64 seq, end_seq, max_seq; 162ab174ad8SPaolo Abeni struct sk_buff *skb1; 163ab174ad8SPaolo Abeni 164ab174ad8SPaolo Abeni seq = MPTCP_SKB_CB(skb)->map_seq; 165ab174ad8SPaolo Abeni end_seq = MPTCP_SKB_CB(skb)->end_seq; 166fa3fe2b1SFlorian Westphal max_seq = READ_ONCE(msk->rcv_wnd_sent); 167ab174ad8SPaolo Abeni 16806242e44SPaolo Abeni pr_debug("msk=%p seq=%llx limit=%llx empty=%d", msk, seq, max_seq, 16906242e44SPaolo Abeni RB_EMPTY_ROOT(&msk->out_of_order_queue)); 170fa3fe2b1SFlorian Westphal if (after64(end_seq, max_seq)) { 171ab174ad8SPaolo Abeni /* out of window */ 172ab174ad8SPaolo Abeni mptcp_drop(sk, skb); 173fa3fe2b1SFlorian Westphal pr_debug("oow by %lld, rcv_wnd_sent %llu\n", 174fa3fe2b1SFlorian Westphal (unsigned long long)end_seq - (unsigned long)max_seq, 175fa3fe2b1SFlorian Westphal (unsigned long long)msk->rcv_wnd_sent); 17606242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_NODSSWINDOW); 177ab174ad8SPaolo Abeni return; 178ab174ad8SPaolo Abeni } 179ab174ad8SPaolo Abeni 180ab174ad8SPaolo Abeni p = &msk->out_of_order_queue.rb_node; 18106242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUE); 182ab174ad8SPaolo Abeni if (RB_EMPTY_ROOT(&msk->out_of_order_queue)) { 183ab174ad8SPaolo Abeni rb_link_node(&skb->rbnode, NULL, p); 184ab174ad8SPaolo Abeni rb_insert_color(&skb->rbnode, &msk->out_of_order_queue); 185ab174ad8SPaolo Abeni msk->ooo_last_skb = skb; 186ab174ad8SPaolo Abeni goto end; 187ab174ad8SPaolo Abeni } 188ab174ad8SPaolo Abeni 189ab174ad8SPaolo Abeni /* with 2 subflows, adding at end of ooo queue is quite likely 190ab174ad8SPaolo Abeni * Use of ooo_last_skb avoids the O(Log(N)) rbtree lookup. 191ab174ad8SPaolo Abeni */ 19206242e44SPaolo Abeni if (mptcp_ooo_try_coalesce(msk, msk->ooo_last_skb, skb)) { 19306242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE); 19406242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL); 195ab174ad8SPaolo Abeni return; 19606242e44SPaolo Abeni } 197ab174ad8SPaolo Abeni 198ab174ad8SPaolo Abeni /* Can avoid an rbtree lookup if we are adding skb after ooo_last_skb */ 199ab174ad8SPaolo Abeni if (!before64(seq, MPTCP_SKB_CB(msk->ooo_last_skb)->end_seq)) { 20006242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOQUEUETAIL); 201ab174ad8SPaolo Abeni parent = &msk->ooo_last_skb->rbnode; 202ab174ad8SPaolo Abeni p = &parent->rb_right; 203ab174ad8SPaolo Abeni goto insert; 204ab174ad8SPaolo Abeni } 205ab174ad8SPaolo Abeni 206ab174ad8SPaolo Abeni /* Find place to insert this segment. Handle overlaps on the way. */ 207ab174ad8SPaolo Abeni parent = NULL; 208ab174ad8SPaolo Abeni while (*p) { 209ab174ad8SPaolo Abeni parent = *p; 210ab174ad8SPaolo Abeni skb1 = rb_to_skb(parent); 211ab174ad8SPaolo Abeni if (before64(seq, MPTCP_SKB_CB(skb1)->map_seq)) { 212ab174ad8SPaolo Abeni p = &parent->rb_left; 213ab174ad8SPaolo Abeni continue; 214ab174ad8SPaolo Abeni } 215ab174ad8SPaolo Abeni if (before64(seq, MPTCP_SKB_CB(skb1)->end_seq)) { 216ab174ad8SPaolo Abeni if (!after64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) { 217ab174ad8SPaolo Abeni /* All the bits are present. Drop. */ 218ab174ad8SPaolo Abeni mptcp_drop(sk, skb); 21906242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); 220ab174ad8SPaolo Abeni return; 221ab174ad8SPaolo Abeni } 222ab174ad8SPaolo Abeni if (after64(seq, MPTCP_SKB_CB(skb1)->map_seq)) { 223ab174ad8SPaolo Abeni /* partial overlap: 224ab174ad8SPaolo Abeni * | skb | 225ab174ad8SPaolo Abeni * | skb1 | 226ab174ad8SPaolo Abeni * continue traversing 227ab174ad8SPaolo Abeni */ 228ab174ad8SPaolo Abeni } else { 229ab174ad8SPaolo Abeni /* skb's seq == skb1's seq and skb covers skb1. 230ab174ad8SPaolo Abeni * Replace skb1 with skb. 231ab174ad8SPaolo Abeni */ 232ab174ad8SPaolo Abeni rb_replace_node(&skb1->rbnode, &skb->rbnode, 233ab174ad8SPaolo Abeni &msk->out_of_order_queue); 234ab174ad8SPaolo Abeni mptcp_drop(sk, skb1); 23506242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); 236ab174ad8SPaolo Abeni goto merge_right; 237ab174ad8SPaolo Abeni } 238ab174ad8SPaolo Abeni } else if (mptcp_ooo_try_coalesce(msk, skb1, skb)) { 23906242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_OFOMERGE); 240ab174ad8SPaolo Abeni return; 241ab174ad8SPaolo Abeni } 242ab174ad8SPaolo Abeni p = &parent->rb_right; 243ab174ad8SPaolo Abeni } 24406242e44SPaolo Abeni 245ab174ad8SPaolo Abeni insert: 246ab174ad8SPaolo Abeni /* Insert segment into RB tree. */ 247ab174ad8SPaolo Abeni rb_link_node(&skb->rbnode, parent, p); 248ab174ad8SPaolo Abeni rb_insert_color(&skb->rbnode, &msk->out_of_order_queue); 249ab174ad8SPaolo Abeni 250ab174ad8SPaolo Abeni merge_right: 251ab174ad8SPaolo Abeni /* Remove other segments covered by skb. */ 252ab174ad8SPaolo Abeni while ((skb1 = skb_rb_next(skb)) != NULL) { 253ab174ad8SPaolo Abeni if (before64(end_seq, MPTCP_SKB_CB(skb1)->end_seq)) 254ab174ad8SPaolo Abeni break; 255ab174ad8SPaolo Abeni rb_erase(&skb1->rbnode, &msk->out_of_order_queue); 256ab174ad8SPaolo Abeni mptcp_drop(sk, skb1); 25706242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); 258ab174ad8SPaolo Abeni } 259ab174ad8SPaolo Abeni /* If there is no skb after us, we are the last_skb ! */ 260ab174ad8SPaolo Abeni if (!skb1) 261ab174ad8SPaolo Abeni msk->ooo_last_skb = skb; 262ab174ad8SPaolo Abeni 263ab174ad8SPaolo Abeni end: 264ab174ad8SPaolo Abeni skb_condense(skb); 265ab174ad8SPaolo Abeni skb_set_owner_r(skb, sk); 266ab174ad8SPaolo Abeni } 267ab174ad8SPaolo Abeni 268ab174ad8SPaolo Abeni static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk, 269ab174ad8SPaolo Abeni struct sk_buff *skb, unsigned int offset, 270ab174ad8SPaolo Abeni size_t copy_len) 271ab174ad8SPaolo Abeni { 272ab174ad8SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 2736771bfd9SFlorian Westphal struct sock *sk = (struct sock *)msk; 2744e637c70SFlorian Westphal struct sk_buff *tail; 2756771bfd9SFlorian Westphal 2766771bfd9SFlorian Westphal __skb_unlink(skb, &ssk->sk_receive_queue); 2774e637c70SFlorian Westphal 2784e637c70SFlorian Westphal skb_ext_reset(skb); 2794e637c70SFlorian Westphal skb_orphan(skb); 2804e637c70SFlorian Westphal 2819c3f94e1SPaolo Abeni /* try to fetch required memory from subflow */ 2829c3f94e1SPaolo Abeni if (!sk_rmem_schedule(sk, skb, skb->truesize)) { 283*72f96132SPaolo Abeni int amount = sk_mem_pages(skb->truesize) << SK_MEM_QUANTUM_SHIFT; 284*72f96132SPaolo Abeni 285*72f96132SPaolo Abeni if (ssk->sk_forward_alloc < amount) 2869c3f94e1SPaolo Abeni goto drop; 287*72f96132SPaolo Abeni 288*72f96132SPaolo Abeni ssk->sk_forward_alloc -= amount; 289*72f96132SPaolo Abeni sk->sk_forward_alloc += amount; 2909c3f94e1SPaolo Abeni } 2919c3f94e1SPaolo Abeni 292ab174ad8SPaolo Abeni /* the skb map_seq accounts for the skb offset: 293ab174ad8SPaolo Abeni * mptcp_subflow_get_mapped_dsn() is based on the current tp->copied_seq 294ab174ad8SPaolo Abeni * value 295ab174ad8SPaolo Abeni */ 296ab174ad8SPaolo Abeni MPTCP_SKB_CB(skb)->map_seq = mptcp_subflow_get_mapped_dsn(subflow); 297ab174ad8SPaolo Abeni MPTCP_SKB_CB(skb)->end_seq = MPTCP_SKB_CB(skb)->map_seq + copy_len; 298ab174ad8SPaolo Abeni MPTCP_SKB_CB(skb)->offset = offset; 299ab174ad8SPaolo Abeni 300ab174ad8SPaolo Abeni if (MPTCP_SKB_CB(skb)->map_seq == msk->ack_seq) { 301ab174ad8SPaolo Abeni /* in sequence */ 302917944daSMat Martineau WRITE_ONCE(msk->ack_seq, msk->ack_seq + copy_len); 3034e637c70SFlorian Westphal tail = skb_peek_tail(&sk->sk_receive_queue); 3048268ed4cSPaolo Abeni if (tail && mptcp_try_coalesce(sk, tail, skb)) 305ab174ad8SPaolo Abeni return true; 3064e637c70SFlorian Westphal 307600911ffSFlorian Westphal skb_set_owner_r(skb, sk); 3086771bfd9SFlorian Westphal __skb_queue_tail(&sk->sk_receive_queue, skb); 309ab174ad8SPaolo Abeni return true; 310ab174ad8SPaolo Abeni } else if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) { 311ab174ad8SPaolo Abeni mptcp_data_queue_ofo(msk, skb); 312ab174ad8SPaolo Abeni return false; 313ab174ad8SPaolo Abeni } 314ab174ad8SPaolo Abeni 315ab174ad8SPaolo Abeni /* old data, keep it simple and drop the whole pkt, sender 316ab174ad8SPaolo Abeni * will retransmit as needed, if needed. 317ab174ad8SPaolo Abeni */ 31806242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); 3199c3f94e1SPaolo Abeni drop: 320ab174ad8SPaolo Abeni mptcp_drop(sk, skb); 321ab174ad8SPaolo Abeni return false; 3226771bfd9SFlorian Westphal } 3236771bfd9SFlorian Westphal 32416a9a9daSMat Martineau static void mptcp_stop_timer(struct sock *sk) 32516a9a9daSMat Martineau { 32616a9a9daSMat Martineau struct inet_connection_sock *icsk = inet_csk(sk); 32716a9a9daSMat Martineau 32816a9a9daSMat Martineau sk_stop_timer(sk, &icsk->icsk_retransmit_timer); 32916a9a9daSMat Martineau mptcp_sk(sk)->timer_ival = 0; 33016a9a9daSMat Martineau } 33116a9a9daSMat Martineau 332e16163b6SPaolo Abeni static void mptcp_close_wake_up(struct sock *sk) 333e16163b6SPaolo Abeni { 334e16163b6SPaolo Abeni if (sock_flag(sk, SOCK_DEAD)) 335e16163b6SPaolo Abeni return; 336e16163b6SPaolo Abeni 337e16163b6SPaolo Abeni sk->sk_state_change(sk); 338e16163b6SPaolo Abeni if (sk->sk_shutdown == SHUTDOWN_MASK || 339e16163b6SPaolo Abeni sk->sk_state == TCP_CLOSE) 340e16163b6SPaolo Abeni sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP); 341e16163b6SPaolo Abeni else 342e16163b6SPaolo Abeni sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 343e16163b6SPaolo Abeni } 344e16163b6SPaolo Abeni 3456e628cd3SPaolo Abeni static bool mptcp_pending_data_fin_ack(struct sock *sk) 3466e628cd3SPaolo Abeni { 3476e628cd3SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 3486e628cd3SPaolo Abeni 3496e628cd3SPaolo Abeni return !__mptcp_check_fallback(msk) && 3506e628cd3SPaolo Abeni ((1 << sk->sk_state) & 3516e628cd3SPaolo Abeni (TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK)) && 3526e628cd3SPaolo Abeni msk->write_seq == READ_ONCE(msk->snd_una); 3536e628cd3SPaolo Abeni } 3546e628cd3SPaolo Abeni 35516a9a9daSMat Martineau static void mptcp_check_data_fin_ack(struct sock *sk) 35616a9a9daSMat Martineau { 35716a9a9daSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk); 35816a9a9daSMat Martineau 35916a9a9daSMat Martineau /* Look for an acknowledged DATA_FIN */ 3606e628cd3SPaolo Abeni if (mptcp_pending_data_fin_ack(sk)) { 36116a9a9daSMat Martineau WRITE_ONCE(msk->snd_data_fin_enable, 0); 36216a9a9daSMat Martineau 36316a9a9daSMat Martineau switch (sk->sk_state) { 36416a9a9daSMat Martineau case TCP_FIN_WAIT1: 36516a9a9daSMat Martineau inet_sk_state_store(sk, TCP_FIN_WAIT2); 36616a9a9daSMat Martineau break; 36716a9a9daSMat Martineau case TCP_CLOSING: 36816a9a9daSMat Martineau case TCP_LAST_ACK: 36916a9a9daSMat Martineau inet_sk_state_store(sk, TCP_CLOSE); 37016a9a9daSMat Martineau break; 37116a9a9daSMat Martineau } 37216a9a9daSMat Martineau 373e16163b6SPaolo Abeni mptcp_close_wake_up(sk); 37416a9a9daSMat Martineau } 37516a9a9daSMat Martineau } 37616a9a9daSMat Martineau 3773721b9b6SMat Martineau static bool mptcp_pending_data_fin(struct sock *sk, u64 *seq) 3783721b9b6SMat Martineau { 3793721b9b6SMat Martineau struct mptcp_sock *msk = mptcp_sk(sk); 3803721b9b6SMat Martineau 3813721b9b6SMat Martineau if (READ_ONCE(msk->rcv_data_fin) && 3823721b9b6SMat Martineau ((1 << sk->sk_state) & 3833721b9b6SMat Martineau (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2))) { 3843721b9b6SMat Martineau u64 rcv_data_fin_seq = READ_ONCE(msk->rcv_data_fin_seq); 3853721b9b6SMat Martineau 3863721b9b6SMat Martineau if (msk->ack_seq == rcv_data_fin_seq) { 3873721b9b6SMat Martineau if (seq) 3883721b9b6SMat Martineau *seq = rcv_data_fin_seq; 3893721b9b6SMat Martineau 3903721b9b6SMat Martineau return true; 3913721b9b6SMat Martineau } 3923721b9b6SMat Martineau } 3933721b9b6SMat Martineau 3943721b9b6SMat Martineau return false; 3953721b9b6SMat Martineau } 3963721b9b6SMat Martineau 3976477dd39SMat Martineau static void mptcp_set_datafin_timeout(const struct sock *sk) 3986477dd39SMat Martineau { 3996477dd39SMat Martineau struct inet_connection_sock *icsk = inet_csk(sk); 4006477dd39SMat Martineau 4016477dd39SMat Martineau mptcp_sk(sk)->timer_ival = min(TCP_RTO_MAX, 4026477dd39SMat Martineau TCP_RTO_MIN << icsk->icsk_retransmits); 4036477dd39SMat Martineau } 4046477dd39SMat Martineau 4053721b9b6SMat Martineau static void mptcp_set_timeout(const struct sock *sk, const struct sock *ssk) 4063721b9b6SMat Martineau { 4073721b9b6SMat Martineau long tout = ssk && inet_csk(ssk)->icsk_pending ? 4083721b9b6SMat Martineau inet_csk(ssk)->icsk_timeout - jiffies : 0; 4093721b9b6SMat Martineau 4103721b9b6SMat Martineau if (tout <= 0) 4113721b9b6SMat Martineau tout = mptcp_sk(sk)->timer_ival; 4123721b9b6SMat Martineau mptcp_sk(sk)->timer_ival = tout > 0 ? tout : TCP_RTO_MIN; 4133721b9b6SMat Martineau } 4143721b9b6SMat Martineau 415fd897679SPaolo Abeni static bool tcp_can_send_ack(const struct sock *ssk) 416fd897679SPaolo Abeni { 417fd897679SPaolo Abeni return !((1 << inet_sk_state_load(ssk)) & 41820bc80b6SPaolo Abeni (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_TIME_WAIT | TCPF_CLOSE | TCPF_LISTEN)); 419fd897679SPaolo Abeni } 420fd897679SPaolo Abeni 421fd897679SPaolo Abeni static void mptcp_send_ack(struct mptcp_sock *msk) 4227ed90803SPaolo Abeni { 4237ed90803SPaolo Abeni struct mptcp_subflow_context *subflow; 4247ed90803SPaolo Abeni 4257ed90803SPaolo Abeni mptcp_for_each_subflow(msk, subflow) { 4267ed90803SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 4277ed90803SPaolo Abeni 4287ed90803SPaolo Abeni lock_sock(ssk); 429fd897679SPaolo Abeni if (tcp_can_send_ack(ssk)) 4307ed90803SPaolo Abeni tcp_send_ack(ssk); 4317ed90803SPaolo Abeni release_sock(ssk); 432fd897679SPaolo Abeni } 433ea4ca586SPaolo Abeni } 434ea4ca586SPaolo Abeni 435fd897679SPaolo Abeni static bool mptcp_subflow_cleanup_rbuf(struct sock *ssk) 436fd897679SPaolo Abeni { 437fd897679SPaolo Abeni int ret; 438fd897679SPaolo Abeni 439fd897679SPaolo Abeni lock_sock(ssk); 440fd897679SPaolo Abeni ret = tcp_can_send_ack(ssk); 441fd897679SPaolo Abeni if (ret) 442fd897679SPaolo Abeni tcp_cleanup_rbuf(ssk, 1); 443fd897679SPaolo Abeni release_sock(ssk); 444fd897679SPaolo Abeni return ret; 445ea4ca586SPaolo Abeni } 446fd897679SPaolo Abeni 447fd897679SPaolo Abeni static void mptcp_cleanup_rbuf(struct mptcp_sock *msk) 448fd897679SPaolo Abeni { 44987952603SPaolo Abeni struct sock *ack_hint = READ_ONCE(msk->ack_hint); 450e3859603SPaolo Abeni int old_space = READ_ONCE(msk->old_wspace); 451fd897679SPaolo Abeni struct mptcp_subflow_context *subflow; 452e3859603SPaolo Abeni struct sock *sk = (struct sock *)msk; 453e3859603SPaolo Abeni bool cleanup; 454e3859603SPaolo Abeni 455e3859603SPaolo Abeni /* this is a simple superset of what tcp_cleanup_rbuf() implements 456e3859603SPaolo Abeni * so that we don't have to acquire the ssk socket lock most of the time 457e3859603SPaolo Abeni * to do actually nothing 458e3859603SPaolo Abeni */ 459e3859603SPaolo Abeni cleanup = __mptcp_space(sk) - old_space >= max(0, old_space); 460e3859603SPaolo Abeni if (!cleanup) 461e3859603SPaolo Abeni return; 462fd897679SPaolo Abeni 463fd897679SPaolo Abeni /* if the hinted ssk is still active, try to use it */ 46487952603SPaolo Abeni if (likely(ack_hint)) { 465fd897679SPaolo Abeni mptcp_for_each_subflow(msk, subflow) { 466fd897679SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 467fd897679SPaolo Abeni 46887952603SPaolo Abeni if (ack_hint == ssk && mptcp_subflow_cleanup_rbuf(ssk)) 469fd897679SPaolo Abeni return; 4707ed90803SPaolo Abeni } 4717ed90803SPaolo Abeni } 4727ed90803SPaolo Abeni 473fd897679SPaolo Abeni /* otherwise pick the first active subflow */ 474fd897679SPaolo Abeni mptcp_for_each_subflow(msk, subflow) 475fd897679SPaolo Abeni if (mptcp_subflow_cleanup_rbuf(mptcp_subflow_tcp_sock(subflow))) 476fd897679SPaolo Abeni return; 477fd897679SPaolo Abeni } 478fd897679SPaolo Abeni 4797ed90803SPaolo Abeni static bool mptcp_check_data_fin(struct sock *sk) 4803721b9b6SMat Martineau { 4813721b9b6SMat Martineau struct mptcp_sock *msk = mptcp_sk(sk); 4823721b9b6SMat Martineau u64 rcv_data_fin_seq; 4837ed90803SPaolo Abeni bool ret = false; 4843721b9b6SMat Martineau 485781bf13dSPaolo Abeni if (__mptcp_check_fallback(msk)) 4867ed90803SPaolo Abeni return ret; 4873721b9b6SMat Martineau 4883721b9b6SMat Martineau /* Need to ack a DATA_FIN received from a peer while this side 4893721b9b6SMat Martineau * of the connection is in ESTABLISHED, FIN_WAIT1, or FIN_WAIT2. 4903721b9b6SMat Martineau * msk->rcv_data_fin was set when parsing the incoming options 4913721b9b6SMat Martineau * at the subflow level and the msk lock was not held, so this 4923721b9b6SMat Martineau * is the first opportunity to act on the DATA_FIN and change 4933721b9b6SMat Martineau * the msk state. 4943721b9b6SMat Martineau * 4953721b9b6SMat Martineau * If we are caught up to the sequence number of the incoming 4963721b9b6SMat Martineau * DATA_FIN, send the DATA_ACK now and do state transition. If 4973721b9b6SMat Martineau * not caught up, do nothing and let the recv code send DATA_ACK 4983721b9b6SMat Martineau * when catching up. 4993721b9b6SMat Martineau */ 5003721b9b6SMat Martineau 5013721b9b6SMat Martineau if (mptcp_pending_data_fin(sk, &rcv_data_fin_seq)) { 502917944daSMat Martineau WRITE_ONCE(msk->ack_seq, msk->ack_seq + 1); 5033721b9b6SMat Martineau WRITE_ONCE(msk->rcv_data_fin, 0); 5043721b9b6SMat Martineau 5053721b9b6SMat Martineau sk->sk_shutdown |= RCV_SHUTDOWN; 50616a9a9daSMat Martineau smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ 50716a9a9daSMat Martineau set_bit(MPTCP_DATA_READY, &msk->flags); 5083721b9b6SMat Martineau 5093721b9b6SMat Martineau switch (sk->sk_state) { 5103721b9b6SMat Martineau case TCP_ESTABLISHED: 5113721b9b6SMat Martineau inet_sk_state_store(sk, TCP_CLOSE_WAIT); 5123721b9b6SMat Martineau break; 5133721b9b6SMat Martineau case TCP_FIN_WAIT1: 5143721b9b6SMat Martineau inet_sk_state_store(sk, TCP_CLOSING); 5153721b9b6SMat Martineau break; 5163721b9b6SMat Martineau case TCP_FIN_WAIT2: 5173721b9b6SMat Martineau inet_sk_state_store(sk, TCP_CLOSE); 5183721b9b6SMat Martineau break; 5193721b9b6SMat Martineau default: 5203721b9b6SMat Martineau /* Other states not expected */ 5213721b9b6SMat Martineau WARN_ON_ONCE(1); 5223721b9b6SMat Martineau break; 5233721b9b6SMat Martineau } 5243721b9b6SMat Martineau 5257ed90803SPaolo Abeni ret = true; 5263721b9b6SMat Martineau mptcp_set_timeout(sk, NULL); 527fd897679SPaolo Abeni mptcp_send_ack(msk); 528e16163b6SPaolo Abeni mptcp_close_wake_up(sk); 5293721b9b6SMat Martineau } 5307ed90803SPaolo Abeni return ret; 5313721b9b6SMat Martineau } 5323721b9b6SMat Martineau 5336771bfd9SFlorian Westphal static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk, 5346771bfd9SFlorian Westphal struct sock *ssk, 5356771bfd9SFlorian Westphal unsigned int *bytes) 5366771bfd9SFlorian Westphal { 5376771bfd9SFlorian Westphal struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 538600911ffSFlorian Westphal struct sock *sk = (struct sock *)msk; 5396771bfd9SFlorian Westphal unsigned int moved = 0; 5406771bfd9SFlorian Westphal bool more_data_avail; 5416771bfd9SFlorian Westphal struct tcp_sock *tp; 5426771bfd9SFlorian Westphal bool done = false; 54313c7ba0cSFlorian Westphal int sk_rbuf; 54413c7ba0cSFlorian Westphal 54513c7ba0cSFlorian Westphal sk_rbuf = READ_ONCE(sk->sk_rcvbuf); 54613c7ba0cSFlorian Westphal 54713c7ba0cSFlorian Westphal if (!(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { 54813c7ba0cSFlorian Westphal int ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf); 54913c7ba0cSFlorian Westphal 55013c7ba0cSFlorian Westphal if (unlikely(ssk_rbuf > sk_rbuf)) { 55113c7ba0cSFlorian Westphal WRITE_ONCE(sk->sk_rcvbuf, ssk_rbuf); 55213c7ba0cSFlorian Westphal sk_rbuf = ssk_rbuf; 55313c7ba0cSFlorian Westphal } 55413c7ba0cSFlorian Westphal } 555600911ffSFlorian Westphal 556ab174ad8SPaolo Abeni pr_debug("msk=%p ssk=%p", msk, ssk); 5576771bfd9SFlorian Westphal tp = tcp_sk(ssk); 5586771bfd9SFlorian Westphal do { 5596771bfd9SFlorian Westphal u32 map_remaining, offset; 5606771bfd9SFlorian Westphal u32 seq = tp->copied_seq; 5616771bfd9SFlorian Westphal struct sk_buff *skb; 5626771bfd9SFlorian Westphal bool fin; 5636771bfd9SFlorian Westphal 5646771bfd9SFlorian Westphal /* try to move as much data as available */ 5656771bfd9SFlorian Westphal map_remaining = subflow->map_data_len - 5666771bfd9SFlorian Westphal mptcp_subflow_get_map_offset(subflow); 5676771bfd9SFlorian Westphal 5686771bfd9SFlorian Westphal skb = skb_peek(&ssk->sk_receive_queue); 569d9fb8c50SPaolo Abeni if (!skb) { 570d9fb8c50SPaolo Abeni /* if no data is found, a racing workqueue/recvmsg 571d9fb8c50SPaolo Abeni * already processed the new data, stop here or we 572d9fb8c50SPaolo Abeni * can enter an infinite loop 573d9fb8c50SPaolo Abeni */ 574d9fb8c50SPaolo Abeni if (!moved) 575d9fb8c50SPaolo Abeni done = true; 5766771bfd9SFlorian Westphal break; 577d9fb8c50SPaolo Abeni } 5786771bfd9SFlorian Westphal 579e1ff9e82SDavide Caratti if (__mptcp_check_fallback(msk)) { 580e1ff9e82SDavide Caratti /* if we are running under the workqueue, TCP could have 581e1ff9e82SDavide Caratti * collapsed skbs between dummy map creation and now 582e1ff9e82SDavide Caratti * be sure to adjust the size 583e1ff9e82SDavide Caratti */ 584e1ff9e82SDavide Caratti map_remaining = skb->len; 585e1ff9e82SDavide Caratti subflow->map_data_len = skb->len; 586e1ff9e82SDavide Caratti } 587e1ff9e82SDavide Caratti 5886771bfd9SFlorian Westphal offset = seq - TCP_SKB_CB(skb)->seq; 5896771bfd9SFlorian Westphal fin = TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN; 5906771bfd9SFlorian Westphal if (fin) { 5916771bfd9SFlorian Westphal done = true; 5926771bfd9SFlorian Westphal seq++; 5936771bfd9SFlorian Westphal } 5946771bfd9SFlorian Westphal 5956771bfd9SFlorian Westphal if (offset < skb->len) { 5966771bfd9SFlorian Westphal size_t len = skb->len - offset; 5976771bfd9SFlorian Westphal 5986771bfd9SFlorian Westphal if (tp->urg_data) 5996771bfd9SFlorian Westphal done = true; 6006771bfd9SFlorian Westphal 601ab174ad8SPaolo Abeni if (__mptcp_move_skb(msk, ssk, skb, offset, len)) 6026771bfd9SFlorian Westphal moved += len; 603ab174ad8SPaolo Abeni seq += len; 6046771bfd9SFlorian Westphal 6056771bfd9SFlorian Westphal if (WARN_ON_ONCE(map_remaining < len)) 6066771bfd9SFlorian Westphal break; 6076771bfd9SFlorian Westphal } else { 6086771bfd9SFlorian Westphal WARN_ON_ONCE(!fin); 6096771bfd9SFlorian Westphal sk_eat_skb(ssk, skb); 6106771bfd9SFlorian Westphal done = true; 6116771bfd9SFlorian Westphal } 6126771bfd9SFlorian Westphal 6136771bfd9SFlorian Westphal WRITE_ONCE(tp->copied_seq, seq); 6146771bfd9SFlorian Westphal more_data_avail = mptcp_subflow_data_available(ssk); 615600911ffSFlorian Westphal 61613c7ba0cSFlorian Westphal if (atomic_read(&sk->sk_rmem_alloc) > sk_rbuf) { 617600911ffSFlorian Westphal done = true; 618600911ffSFlorian Westphal break; 619600911ffSFlorian Westphal } 6206771bfd9SFlorian Westphal } while (more_data_avail); 62187952603SPaolo Abeni WRITE_ONCE(msk->ack_hint, ssk); 6226771bfd9SFlorian Westphal 6236719331cSPaolo Abeni *bytes += moved; 6246771bfd9SFlorian Westphal return done; 6256771bfd9SFlorian Westphal } 6266771bfd9SFlorian Westphal 62787952603SPaolo Abeni static bool __mptcp_ofo_queue(struct mptcp_sock *msk) 628ab174ad8SPaolo Abeni { 629ab174ad8SPaolo Abeni struct sock *sk = (struct sock *)msk; 630ab174ad8SPaolo Abeni struct sk_buff *skb, *tail; 631ab174ad8SPaolo Abeni bool moved = false; 632ab174ad8SPaolo Abeni struct rb_node *p; 633ab174ad8SPaolo Abeni u64 end_seq; 634ab174ad8SPaolo Abeni 635ab174ad8SPaolo Abeni p = rb_first(&msk->out_of_order_queue); 63606242e44SPaolo Abeni pr_debug("msk=%p empty=%d", msk, RB_EMPTY_ROOT(&msk->out_of_order_queue)); 637ab174ad8SPaolo Abeni while (p) { 638ab174ad8SPaolo Abeni skb = rb_to_skb(p); 639ab174ad8SPaolo Abeni if (after64(MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq)) 640ab174ad8SPaolo Abeni break; 641ab174ad8SPaolo Abeni 642ab174ad8SPaolo Abeni p = rb_next(p); 643ab174ad8SPaolo Abeni rb_erase(&skb->rbnode, &msk->out_of_order_queue); 644ab174ad8SPaolo Abeni 645ab174ad8SPaolo Abeni if (unlikely(!after64(MPTCP_SKB_CB(skb)->end_seq, 646ab174ad8SPaolo Abeni msk->ack_seq))) { 647ab174ad8SPaolo Abeni mptcp_drop(sk, skb); 64806242e44SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA); 649ab174ad8SPaolo Abeni continue; 650ab174ad8SPaolo Abeni } 651ab174ad8SPaolo Abeni 652ab174ad8SPaolo Abeni end_seq = MPTCP_SKB_CB(skb)->end_seq; 653ab174ad8SPaolo Abeni tail = skb_peek_tail(&sk->sk_receive_queue); 654ab174ad8SPaolo Abeni if (!tail || !mptcp_ooo_try_coalesce(msk, tail, skb)) { 655ab174ad8SPaolo Abeni int delta = msk->ack_seq - MPTCP_SKB_CB(skb)->map_seq; 656ab174ad8SPaolo Abeni 657ab174ad8SPaolo Abeni /* skip overlapping data, if any */ 65806242e44SPaolo Abeni pr_debug("uncoalesced seq=%llx ack seq=%llx delta=%d", 65906242e44SPaolo Abeni MPTCP_SKB_CB(skb)->map_seq, msk->ack_seq, 66006242e44SPaolo Abeni delta); 661ab174ad8SPaolo Abeni MPTCP_SKB_CB(skb)->offset += delta; 662ab174ad8SPaolo Abeni __skb_queue_tail(&sk->sk_receive_queue, skb); 663ab174ad8SPaolo Abeni } 664ab174ad8SPaolo Abeni msk->ack_seq = end_seq; 665ab174ad8SPaolo Abeni moved = true; 666ab174ad8SPaolo Abeni } 667ab174ad8SPaolo Abeni return moved; 668ab174ad8SPaolo Abeni } 669ab174ad8SPaolo Abeni 6702e52213cSFlorian Westphal /* In most cases we will be able to lock the mptcp socket. If its already 6712e52213cSFlorian Westphal * owned, we need to defer to the work queue to avoid ABBA deadlock. 6722e52213cSFlorian Westphal */ 67387952603SPaolo Abeni static void move_skbs_to_msk(struct mptcp_sock *msk, struct sock *ssk) 6742e52213cSFlorian Westphal { 6752e52213cSFlorian Westphal struct sock *sk = (struct sock *)msk; 6762e52213cSFlorian Westphal unsigned int moved = 0; 6772e52213cSFlorian Westphal 67887952603SPaolo Abeni if (inet_sk_state_load(sk) == TCP_CLOSE) 67987952603SPaolo Abeni return; 6802e52213cSFlorian Westphal 68187952603SPaolo Abeni mptcp_data_lock(sk); 6822e52213cSFlorian Westphal 6832e52213cSFlorian Westphal __mptcp_move_skbs_from_subflow(msk, ssk, &moved); 68487952603SPaolo Abeni __mptcp_ofo_queue(msk); 685ab174ad8SPaolo Abeni 686ab174ad8SPaolo Abeni /* If the moves have caught up with the DATA_FIN sequence number 687ab174ad8SPaolo Abeni * it's time to ack the DATA_FIN and change socket state, but 688ab174ad8SPaolo Abeni * this is not a good place to change state. Let the workqueue 689ab174ad8SPaolo Abeni * do it. 690ab174ad8SPaolo Abeni */ 691ba8f48f7SPaolo Abeni if (mptcp_pending_data_fin(sk, NULL)) 692ba8f48f7SPaolo Abeni mptcp_schedule_work(sk); 69387952603SPaolo Abeni mptcp_data_unlock(sk); 6942e52213cSFlorian Westphal } 6952e52213cSFlorian Westphal 6962e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk) 697101f6f85SFlorian Westphal { 6986719331cSPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 699101f6f85SFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 70013c7ba0cSFlorian Westphal int sk_rbuf, ssk_rbuf; 7016719331cSPaolo Abeni bool wake; 702101f6f85SFlorian Westphal 703d7b1bfd0SPaolo Abeni /* The peer can send data while we are shutting down this 704d7b1bfd0SPaolo Abeni * subflow at msk destruction time, but we must avoid enqueuing 705d7b1bfd0SPaolo Abeni * more data to the msk receive queue 706d7b1bfd0SPaolo Abeni */ 707d7b1bfd0SPaolo Abeni if (unlikely(subflow->disposable)) 708d7b1bfd0SPaolo Abeni return; 709d7b1bfd0SPaolo Abeni 7106719331cSPaolo Abeni /* move_skbs_to_msk below can legitly clear the data_avail flag, 7116719331cSPaolo Abeni * but we will need later to properly woke the reader, cache its 7126719331cSPaolo Abeni * value 7136719331cSPaolo Abeni */ 7146719331cSPaolo Abeni wake = subflow->data_avail == MPTCP_SUBFLOW_DATA_AVAIL; 7156719331cSPaolo Abeni if (wake) 716101f6f85SFlorian Westphal set_bit(MPTCP_DATA_READY, &msk->flags); 7176771bfd9SFlorian Westphal 71813c7ba0cSFlorian Westphal ssk_rbuf = READ_ONCE(ssk->sk_rcvbuf); 71913c7ba0cSFlorian Westphal sk_rbuf = READ_ONCE(sk->sk_rcvbuf); 72013c7ba0cSFlorian Westphal if (unlikely(ssk_rbuf > sk_rbuf)) 72113c7ba0cSFlorian Westphal sk_rbuf = ssk_rbuf; 72213c7ba0cSFlorian Westphal 72313c7ba0cSFlorian Westphal /* over limit? can't append more skbs to msk */ 72413c7ba0cSFlorian Westphal if (atomic_read(&sk->sk_rmem_alloc) > sk_rbuf) 7252e52213cSFlorian Westphal goto wake; 7262e52213cSFlorian Westphal 72714c441b5SPaolo Abeni move_skbs_to_msk(msk, ssk); 728ea4ca586SPaolo Abeni 729600911ffSFlorian Westphal wake: 7306719331cSPaolo Abeni if (wake) 731101f6f85SFlorian Westphal sk->sk_data_ready(sk); 732101f6f85SFlorian Westphal } 733101f6f85SFlorian Westphal 73478962489SFlorian Westphal static bool mptcp_do_flush_join_list(struct mptcp_sock *msk) 735ec3edaa7SPeter Krystad { 7365cf92bbaSPaolo Abeni struct mptcp_subflow_context *subflow; 737df00b087SFlorian Westphal bool ret = false; 7385cf92bbaSPaolo Abeni 739ec3edaa7SPeter Krystad if (likely(list_empty(&msk->join_list))) 74078962489SFlorian Westphal return false; 741ec3edaa7SPeter Krystad 742ec3edaa7SPeter Krystad spin_lock_bh(&msk->join_list_lock); 743df00b087SFlorian Westphal list_for_each_entry(subflow, &msk->join_list, node) { 744df00b087SFlorian Westphal u32 sseq = READ_ONCE(subflow->setsockopt_seq); 74578962489SFlorian Westphal 746df00b087SFlorian Westphal mptcp_propagate_sndbuf((struct sock *)msk, mptcp_subflow_tcp_sock(subflow)); 747df00b087SFlorian Westphal if (READ_ONCE(msk->setsockopt_seq) != sseq) 748df00b087SFlorian Westphal ret = true; 749df00b087SFlorian Westphal } 750ec3edaa7SPeter Krystad list_splice_tail_init(&msk->join_list, &msk->conn_list); 751ec3edaa7SPeter Krystad spin_unlock_bh(&msk->join_list_lock); 75278962489SFlorian Westphal 753df00b087SFlorian Westphal return ret; 75478962489SFlorian Westphal } 75578962489SFlorian Westphal 75678962489SFlorian Westphal void __mptcp_flush_join_list(struct mptcp_sock *msk) 75778962489SFlorian Westphal { 75878962489SFlorian Westphal if (likely(!mptcp_do_flush_join_list(msk))) 75978962489SFlorian Westphal return; 76078962489SFlorian Westphal 76178962489SFlorian Westphal if (!test_and_set_bit(MPTCP_WORK_SYNC_SETSOCKOPT, &msk->flags)) 76278962489SFlorian Westphal mptcp_schedule_work((struct sock *)msk); 76378962489SFlorian Westphal } 76478962489SFlorian Westphal 76578962489SFlorian Westphal static void mptcp_flush_join_list(struct mptcp_sock *msk) 76678962489SFlorian Westphal { 76778962489SFlorian Westphal bool sync_needed = test_and_clear_bit(MPTCP_WORK_SYNC_SETSOCKOPT, &msk->flags); 76878962489SFlorian Westphal 76978962489SFlorian Westphal might_sleep(); 77078962489SFlorian Westphal 77178962489SFlorian Westphal if (!mptcp_do_flush_join_list(msk) && !sync_needed) 77278962489SFlorian Westphal return; 77378962489SFlorian Westphal 77478962489SFlorian Westphal mptcp_sockopt_sync_all(msk); 775ec3edaa7SPeter Krystad } 776ec3edaa7SPeter Krystad 777b51f9b80SPaolo Abeni static bool mptcp_timer_pending(struct sock *sk) 778b51f9b80SPaolo Abeni { 779b51f9b80SPaolo Abeni return timer_pending(&inet_csk(sk)->icsk_retransmit_timer); 780b51f9b80SPaolo Abeni } 781b51f9b80SPaolo Abeni 782b51f9b80SPaolo Abeni static void mptcp_reset_timer(struct sock *sk) 783b51f9b80SPaolo Abeni { 784b51f9b80SPaolo Abeni struct inet_connection_sock *icsk = inet_csk(sk); 785b51f9b80SPaolo Abeni unsigned long tout; 786b51f9b80SPaolo Abeni 787e16163b6SPaolo Abeni /* prevent rescheduling on close */ 788e16163b6SPaolo Abeni if (unlikely(inet_sk_state_load(sk) == TCP_CLOSE)) 789e16163b6SPaolo Abeni return; 790e16163b6SPaolo Abeni 791b51f9b80SPaolo Abeni /* should never be called with mptcp level timer cleared */ 792b51f9b80SPaolo Abeni tout = READ_ONCE(mptcp_sk(sk)->timer_ival); 793b51f9b80SPaolo Abeni if (WARN_ON_ONCE(!tout)) 794b51f9b80SPaolo Abeni tout = TCP_RTO_MIN; 795b51f9b80SPaolo Abeni sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + tout); 796b51f9b80SPaolo Abeni } 797b51f9b80SPaolo Abeni 798ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk) 799ba8f48f7SPaolo Abeni { 800ba8f48f7SPaolo Abeni if (inet_sk_state_load(sk) != TCP_CLOSE && 801ba8f48f7SPaolo Abeni schedule_work(&mptcp_sk(sk)->work)) { 802ba8f48f7SPaolo Abeni /* each subflow already holds a reference to the sk, and the 803ba8f48f7SPaolo Abeni * workqueue is invoked by a subflow, so sk can't go away here. 804ba8f48f7SPaolo Abeni */ 805ba8f48f7SPaolo Abeni sock_hold(sk); 806ba8f48f7SPaolo Abeni return true; 807ba8f48f7SPaolo Abeni } 808ba8f48f7SPaolo Abeni return false; 809ba8f48f7SPaolo Abeni } 810ba8f48f7SPaolo Abeni 81159832e24SFlorian Westphal void mptcp_subflow_eof(struct sock *sk) 81259832e24SFlorian Westphal { 813ba8f48f7SPaolo Abeni if (!test_and_set_bit(MPTCP_WORK_EOF, &mptcp_sk(sk)->flags)) 814ba8f48f7SPaolo Abeni mptcp_schedule_work(sk); 81559832e24SFlorian Westphal } 81659832e24SFlorian Westphal 8175969856aSPaolo Abeni static void mptcp_check_for_eof(struct mptcp_sock *msk) 8185969856aSPaolo Abeni { 8195969856aSPaolo Abeni struct mptcp_subflow_context *subflow; 8205969856aSPaolo Abeni struct sock *sk = (struct sock *)msk; 8215969856aSPaolo Abeni int receivers = 0; 8225969856aSPaolo Abeni 8235969856aSPaolo Abeni mptcp_for_each_subflow(msk, subflow) 8245969856aSPaolo Abeni receivers += !subflow->rx_eof; 825e16163b6SPaolo Abeni if (receivers) 826e16163b6SPaolo Abeni return; 8275969856aSPaolo Abeni 828e16163b6SPaolo Abeni if (!(sk->sk_shutdown & RCV_SHUTDOWN)) { 8295969856aSPaolo Abeni /* hopefully temporary hack: propagate shutdown status 8305969856aSPaolo Abeni * to msk, when all subflows agree on it 8315969856aSPaolo Abeni */ 8325969856aSPaolo Abeni sk->sk_shutdown |= RCV_SHUTDOWN; 8335969856aSPaolo Abeni 8345969856aSPaolo Abeni smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ 8355969856aSPaolo Abeni set_bit(MPTCP_DATA_READY, &msk->flags); 8365969856aSPaolo Abeni sk->sk_data_ready(sk); 8375969856aSPaolo Abeni } 838e16163b6SPaolo Abeni 839e16163b6SPaolo Abeni switch (sk->sk_state) { 840e16163b6SPaolo Abeni case TCP_ESTABLISHED: 841e16163b6SPaolo Abeni inet_sk_state_store(sk, TCP_CLOSE_WAIT); 842e16163b6SPaolo Abeni break; 843e16163b6SPaolo Abeni case TCP_FIN_WAIT1: 84426aa2314SPaolo Abeni inet_sk_state_store(sk, TCP_CLOSING); 84526aa2314SPaolo Abeni break; 84626aa2314SPaolo Abeni case TCP_FIN_WAIT2: 847e16163b6SPaolo Abeni inet_sk_state_store(sk, TCP_CLOSE); 848e16163b6SPaolo Abeni break; 849e16163b6SPaolo Abeni default: 850e16163b6SPaolo Abeni return; 851e16163b6SPaolo Abeni } 852e16163b6SPaolo Abeni mptcp_close_wake_up(sk); 8535969856aSPaolo Abeni } 8545969856aSPaolo Abeni 8557a6a6cbcSPaolo Abeni static struct sock *mptcp_subflow_recv_lookup(const struct mptcp_sock *msk) 8567a6a6cbcSPaolo Abeni { 8577a6a6cbcSPaolo Abeni struct mptcp_subflow_context *subflow; 8587a6a6cbcSPaolo Abeni struct sock *sk = (struct sock *)msk; 8597a6a6cbcSPaolo Abeni 8607a6a6cbcSPaolo Abeni sock_owned_by_me(sk); 8617a6a6cbcSPaolo Abeni 8627a6a6cbcSPaolo Abeni mptcp_for_each_subflow(msk, subflow) { 8637a6a6cbcSPaolo Abeni if (subflow->data_avail) 8647a6a6cbcSPaolo Abeni return mptcp_subflow_tcp_sock(subflow); 8657a6a6cbcSPaolo Abeni } 8667a6a6cbcSPaolo Abeni 8677a6a6cbcSPaolo Abeni return NULL; 8687a6a6cbcSPaolo Abeni } 8697a6a6cbcSPaolo Abeni 8703f8e0aaeSPaolo Abeni static bool mptcp_skb_can_collapse_to(u64 write_seq, 87157040755SPaolo Abeni const struct sk_buff *skb, 87257040755SPaolo Abeni const struct mptcp_ext *mpext) 8736d0060f6SMat Martineau { 87457040755SPaolo Abeni if (!tcp_skb_can_collapse_to(skb)) 87557040755SPaolo Abeni return false; 87657040755SPaolo Abeni 8775a369ca6SPaolo Abeni /* can collapse only if MPTCP level sequence is in order and this 8785a369ca6SPaolo Abeni * mapping has not been xmitted yet 8795a369ca6SPaolo Abeni */ 8805a369ca6SPaolo Abeni return mpext && mpext->data_seq + mpext->data_len == write_seq && 8815a369ca6SPaolo Abeni !mpext->frozen; 88257040755SPaolo Abeni } 88357040755SPaolo Abeni 88429249eacSPaolo Abeni /* we can append data to the given data frag if: 88529249eacSPaolo Abeni * - there is space available in the backing page_frag 88629249eacSPaolo Abeni * - the data frag tail matches the current page_frag free offset 88729249eacSPaolo Abeni * - the data frag end sequence number matches the current write seq 88829249eacSPaolo Abeni */ 88918b683bfSPaolo Abeni static bool mptcp_frag_can_collapse_to(const struct mptcp_sock *msk, 89018b683bfSPaolo Abeni const struct page_frag *pfrag, 89118b683bfSPaolo Abeni const struct mptcp_data_frag *df) 89218b683bfSPaolo Abeni { 89318b683bfSPaolo Abeni return df && pfrag->page == df->page && 894d9ca1de8SPaolo Abeni pfrag->size - pfrag->offset > 0 && 89529249eacSPaolo Abeni pfrag->offset == (df->offset + df->data_len) && 89618b683bfSPaolo Abeni df->data_seq + df->data_len == msk->write_seq; 89718b683bfSPaolo Abeni } 89818b683bfSPaolo Abeni 899724cfd2eSPaolo Abeni static int mptcp_wmem_with_overhead(struct sock *sk, int size) 900e93da928SPaolo Abeni { 901724cfd2eSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 902724cfd2eSPaolo Abeni int ret, skbs; 903724cfd2eSPaolo Abeni 904724cfd2eSPaolo Abeni ret = size + ((sizeof(struct mptcp_data_frag) * size) >> PAGE_SHIFT); 905724cfd2eSPaolo Abeni skbs = (msk->tx_pending_data + size) / msk->size_goal_cache; 906724cfd2eSPaolo Abeni if (skbs < msk->skb_tx_cache.qlen) 907724cfd2eSPaolo Abeni return ret; 908724cfd2eSPaolo Abeni 909724cfd2eSPaolo Abeni return ret + (skbs - msk->skb_tx_cache.qlen) * SKB_TRUESIZE(MAX_TCP_HEADER); 910e93da928SPaolo Abeni } 911e93da928SPaolo Abeni 912e93da928SPaolo Abeni static void __mptcp_wmem_reserve(struct sock *sk, int size) 913e93da928SPaolo Abeni { 914724cfd2eSPaolo Abeni int amount = mptcp_wmem_with_overhead(sk, size); 915e93da928SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 916e93da928SPaolo Abeni 917e93da928SPaolo Abeni WARN_ON_ONCE(msk->wmem_reserved); 918e7579d5dSDavide Caratti if (WARN_ON_ONCE(amount < 0)) 919e7579d5dSDavide Caratti amount = 0; 920e7579d5dSDavide Caratti 921e93da928SPaolo Abeni if (amount <= sk->sk_forward_alloc) 922e93da928SPaolo Abeni goto reserve; 923e93da928SPaolo Abeni 924e93da928SPaolo Abeni /* under memory pressure try to reserve at most a single page 925e93da928SPaolo Abeni * otherwise try to reserve the full estimate and fallback 926e93da928SPaolo Abeni * to a single page before entering the error path 927e93da928SPaolo Abeni */ 928e93da928SPaolo Abeni if ((tcp_under_memory_pressure(sk) && amount > PAGE_SIZE) || 929e93da928SPaolo Abeni !sk_wmem_schedule(sk, amount)) { 930e93da928SPaolo Abeni if (amount <= PAGE_SIZE) 931e93da928SPaolo Abeni goto nomem; 932e93da928SPaolo Abeni 933e93da928SPaolo Abeni amount = PAGE_SIZE; 934e93da928SPaolo Abeni if (!sk_wmem_schedule(sk, amount)) 935e93da928SPaolo Abeni goto nomem; 936e93da928SPaolo Abeni } 937e93da928SPaolo Abeni 938e93da928SPaolo Abeni reserve: 939e93da928SPaolo Abeni msk->wmem_reserved = amount; 940e93da928SPaolo Abeni sk->sk_forward_alloc -= amount; 941e93da928SPaolo Abeni return; 942e93da928SPaolo Abeni 943e93da928SPaolo Abeni nomem: 944e93da928SPaolo Abeni /* we will wait for memory on next allocation */ 945e93da928SPaolo Abeni msk->wmem_reserved = -1; 946e93da928SPaolo Abeni } 947e93da928SPaolo Abeni 948e93da928SPaolo Abeni static void __mptcp_update_wmem(struct sock *sk) 949e93da928SPaolo Abeni { 950e93da928SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 951e93da928SPaolo Abeni 952b5941f06SPaolo Abeni #ifdef CONFIG_LOCKDEP 953b5941f06SPaolo Abeni WARN_ON_ONCE(!lockdep_is_held(&sk->sk_lock.slock)); 954b5941f06SPaolo Abeni #endif 955b5941f06SPaolo Abeni 956e93da928SPaolo Abeni if (!msk->wmem_reserved) 957e93da928SPaolo Abeni return; 958e93da928SPaolo Abeni 959e93da928SPaolo Abeni if (msk->wmem_reserved < 0) 960e93da928SPaolo Abeni msk->wmem_reserved = 0; 961e93da928SPaolo Abeni if (msk->wmem_reserved > 0) { 962e93da928SPaolo Abeni sk->sk_forward_alloc += msk->wmem_reserved; 963e93da928SPaolo Abeni msk->wmem_reserved = 0; 964e93da928SPaolo Abeni } 965e93da928SPaolo Abeni } 966e93da928SPaolo Abeni 967e93da928SPaolo Abeni static bool mptcp_wmem_alloc(struct sock *sk, int size) 968e93da928SPaolo Abeni { 969e93da928SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 970e93da928SPaolo Abeni 971e93da928SPaolo Abeni /* check for pre-existing error condition */ 972e93da928SPaolo Abeni if (msk->wmem_reserved < 0) 973e93da928SPaolo Abeni return false; 974e93da928SPaolo Abeni 975e93da928SPaolo Abeni if (msk->wmem_reserved >= size) 976e93da928SPaolo Abeni goto account; 977e93da928SPaolo Abeni 97887952603SPaolo Abeni mptcp_data_lock(sk); 97987952603SPaolo Abeni if (!sk_wmem_schedule(sk, size)) { 98087952603SPaolo Abeni mptcp_data_unlock(sk); 981e93da928SPaolo Abeni return false; 98287952603SPaolo Abeni } 983e93da928SPaolo Abeni 984e93da928SPaolo Abeni sk->sk_forward_alloc -= size; 985e93da928SPaolo Abeni msk->wmem_reserved += size; 98687952603SPaolo Abeni mptcp_data_unlock(sk); 987e93da928SPaolo Abeni 988e93da928SPaolo Abeni account: 989e93da928SPaolo Abeni msk->wmem_reserved -= size; 990e93da928SPaolo Abeni return true; 991e93da928SPaolo Abeni } 992e93da928SPaolo Abeni 99387952603SPaolo Abeni static void mptcp_wmem_uncharge(struct sock *sk, int size) 99487952603SPaolo Abeni { 99587952603SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 99687952603SPaolo Abeni 99787952603SPaolo Abeni if (msk->wmem_reserved < 0) 99887952603SPaolo Abeni msk->wmem_reserved = 0; 99987952603SPaolo Abeni msk->wmem_reserved += size; 100087952603SPaolo Abeni } 100187952603SPaolo Abeni 1002724cfd2eSPaolo Abeni static void mptcp_mem_reclaim_partial(struct sock *sk) 1003724cfd2eSPaolo Abeni { 1004724cfd2eSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 1005724cfd2eSPaolo Abeni 1006724cfd2eSPaolo Abeni /* if we are experiencing a transint allocation error, 1007724cfd2eSPaolo Abeni * the forward allocation memory has been already 1008724cfd2eSPaolo Abeni * released 1009724cfd2eSPaolo Abeni */ 1010724cfd2eSPaolo Abeni if (msk->wmem_reserved < 0) 1011724cfd2eSPaolo Abeni return; 1012724cfd2eSPaolo Abeni 1013724cfd2eSPaolo Abeni mptcp_data_lock(sk); 1014724cfd2eSPaolo Abeni sk->sk_forward_alloc += msk->wmem_reserved; 1015724cfd2eSPaolo Abeni sk_mem_reclaim_partial(sk); 1016724cfd2eSPaolo Abeni msk->wmem_reserved = sk->sk_forward_alloc; 1017724cfd2eSPaolo Abeni sk->sk_forward_alloc = 0; 1018724cfd2eSPaolo Abeni mptcp_data_unlock(sk); 1019724cfd2eSPaolo Abeni } 1020724cfd2eSPaolo Abeni 1021d027236cSPaolo Abeni static void dfrag_uncharge(struct sock *sk, int len) 102218b683bfSPaolo Abeni { 1023d027236cSPaolo Abeni sk_mem_uncharge(sk, len); 10247948f6ccSFlorian Westphal sk_wmem_queued_add(sk, -len); 1025d027236cSPaolo Abeni } 1026d027236cSPaolo Abeni 1027d027236cSPaolo Abeni static void dfrag_clear(struct sock *sk, struct mptcp_data_frag *dfrag) 1028d027236cSPaolo Abeni { 1029d027236cSPaolo Abeni int len = dfrag->data_len + dfrag->overhead; 1030d027236cSPaolo Abeni 103118b683bfSPaolo Abeni list_del(&dfrag->list); 1032d027236cSPaolo Abeni dfrag_uncharge(sk, len); 103318b683bfSPaolo Abeni put_page(dfrag->page); 103418b683bfSPaolo Abeni } 103518b683bfSPaolo Abeni 10366e628cd3SPaolo Abeni static void __mptcp_clean_una(struct sock *sk) 103718b683bfSPaolo Abeni { 103818b683bfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 103918b683bfSPaolo Abeni struct mptcp_data_frag *dtmp, *dfrag; 1040d027236cSPaolo Abeni bool cleaned = false; 1041e1ff9e82SDavide Caratti u64 snd_una; 1042e1ff9e82SDavide Caratti 1043e1ff9e82SDavide Caratti /* on fallback we just need to ignore snd_una, as this is really 1044e1ff9e82SDavide Caratti * plain TCP 1045e1ff9e82SDavide Caratti */ 1046e1ff9e82SDavide Caratti if (__mptcp_check_fallback(msk)) 10477439d687SPaolo Abeni msk->snd_una = READ_ONCE(msk->snd_nxt); 10487439d687SPaolo Abeni 10497439d687SPaolo Abeni snd_una = msk->snd_una; 105018b683bfSPaolo Abeni list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) { 105118b683bfSPaolo Abeni if (after64(dfrag->data_seq + dfrag->data_len, snd_una)) 105218b683bfSPaolo Abeni break; 105318b683bfSPaolo Abeni 1054d9ca1de8SPaolo Abeni if (WARN_ON_ONCE(dfrag == msk->first_pending)) 1055d9ca1de8SPaolo Abeni break; 1056d027236cSPaolo Abeni dfrag_clear(sk, dfrag); 1057d027236cSPaolo Abeni cleaned = true; 1058d027236cSPaolo Abeni } 1059d027236cSPaolo Abeni 10607948f6ccSFlorian Westphal dfrag = mptcp_rtx_head(sk); 10617948f6ccSFlorian Westphal if (dfrag && after64(snd_una, dfrag->data_seq)) { 106253eb4c38SPaolo Abeni u64 delta = snd_una - dfrag->data_seq; 106353eb4c38SPaolo Abeni 1064d9ca1de8SPaolo Abeni if (WARN_ON_ONCE(delta > dfrag->already_sent)) 106553eb4c38SPaolo Abeni goto out; 10667948f6ccSFlorian Westphal 10677948f6ccSFlorian Westphal dfrag->data_seq += delta; 106853eb4c38SPaolo Abeni dfrag->offset += delta; 10697948f6ccSFlorian Westphal dfrag->data_len -= delta; 1070d9ca1de8SPaolo Abeni dfrag->already_sent -= delta; 10717948f6ccSFlorian Westphal 10727948f6ccSFlorian Westphal dfrag_uncharge(sk, delta); 10737948f6ccSFlorian Westphal cleaned = true; 10747948f6ccSFlorian Westphal } 10757948f6ccSFlorian Westphal 107653eb4c38SPaolo Abeni out: 10776e628cd3SPaolo Abeni if (cleaned) { 10786e628cd3SPaolo Abeni if (tcp_under_memory_pressure(sk)) { 10796e628cd3SPaolo Abeni __mptcp_update_wmem(sk); 1080d027236cSPaolo Abeni sk_mem_reclaim_partial(sk); 108195ed690eSFlorian Westphal } 108218b683bfSPaolo Abeni } 108318b683bfSPaolo Abeni 10846e628cd3SPaolo Abeni if (snd_una == READ_ONCE(msk->snd_nxt)) { 10856477dd39SMat Martineau if (msk->timer_ival && !mptcp_data_fin_enabled(msk)) 10866e628cd3SPaolo Abeni mptcp_stop_timer(sk); 10876e628cd3SPaolo Abeni } else { 10886e628cd3SPaolo Abeni mptcp_reset_timer(sk); 10896e628cd3SPaolo Abeni } 10906e628cd3SPaolo Abeni } 10916e628cd3SPaolo Abeni 1092417789dfSPaolo Abeni static void __mptcp_clean_una_wakeup(struct sock *sk) 1093417789dfSPaolo Abeni { 1094b5941f06SPaolo Abeni #ifdef CONFIG_LOCKDEP 1095b5941f06SPaolo Abeni WARN_ON_ONCE(!lockdep_is_held(&sk->sk_lock.slock)); 1096b5941f06SPaolo Abeni #endif 1097417789dfSPaolo Abeni __mptcp_clean_una(sk); 1098417789dfSPaolo Abeni mptcp_write_space(sk); 1099417789dfSPaolo Abeni } 1100417789dfSPaolo Abeni 1101b5941f06SPaolo Abeni static void mptcp_clean_una_wakeup(struct sock *sk) 1102b5941f06SPaolo Abeni { 1103b5941f06SPaolo Abeni mptcp_data_lock(sk); 1104b5941f06SPaolo Abeni __mptcp_clean_una_wakeup(sk); 1105b5941f06SPaolo Abeni mptcp_data_unlock(sk); 1106b5941f06SPaolo Abeni } 1107b5941f06SPaolo Abeni 1108724cfd2eSPaolo Abeni static void mptcp_enter_memory_pressure(struct sock *sk) 110918b683bfSPaolo Abeni { 1110d9ca1de8SPaolo Abeni struct mptcp_subflow_context *subflow; 1111d9ca1de8SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 1112d9ca1de8SPaolo Abeni bool first = true; 1113d9ca1de8SPaolo Abeni 111418b683bfSPaolo Abeni sk_stream_moderate_sndbuf(sk); 1115d9ca1de8SPaolo Abeni mptcp_for_each_subflow(msk, subflow) { 1116d9ca1de8SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1117d9ca1de8SPaolo Abeni 1118d9ca1de8SPaolo Abeni if (first) 1119d9ca1de8SPaolo Abeni tcp_enter_memory_pressure(ssk); 1120d9ca1de8SPaolo Abeni sk_stream_moderate_sndbuf(ssk); 1121d9ca1de8SPaolo Abeni first = false; 1122d9ca1de8SPaolo Abeni } 1123724cfd2eSPaolo Abeni } 1124724cfd2eSPaolo Abeni 1125724cfd2eSPaolo Abeni /* ensure we get enough memory for the frag hdr, beyond some minimal amount of 1126724cfd2eSPaolo Abeni * data 1127724cfd2eSPaolo Abeni */ 1128724cfd2eSPaolo Abeni static bool mptcp_page_frag_refill(struct sock *sk, struct page_frag *pfrag) 1129724cfd2eSPaolo Abeni { 1130724cfd2eSPaolo Abeni if (likely(skb_page_frag_refill(32U + sizeof(struct mptcp_data_frag), 1131724cfd2eSPaolo Abeni pfrag, sk->sk_allocation))) 1132724cfd2eSPaolo Abeni return true; 1133724cfd2eSPaolo Abeni 1134724cfd2eSPaolo Abeni mptcp_enter_memory_pressure(sk); 113518b683bfSPaolo Abeni return false; 113618b683bfSPaolo Abeni } 113718b683bfSPaolo Abeni 113818b683bfSPaolo Abeni static struct mptcp_data_frag * 113918b683bfSPaolo Abeni mptcp_carve_data_frag(const struct mptcp_sock *msk, struct page_frag *pfrag, 114018b683bfSPaolo Abeni int orig_offset) 114118b683bfSPaolo Abeni { 114218b683bfSPaolo Abeni int offset = ALIGN(orig_offset, sizeof(long)); 114318b683bfSPaolo Abeni struct mptcp_data_frag *dfrag; 114418b683bfSPaolo Abeni 114518b683bfSPaolo Abeni dfrag = (struct mptcp_data_frag *)(page_to_virt(pfrag->page) + offset); 114618b683bfSPaolo Abeni dfrag->data_len = 0; 114718b683bfSPaolo Abeni dfrag->data_seq = msk->write_seq; 114818b683bfSPaolo Abeni dfrag->overhead = offset - orig_offset + sizeof(struct mptcp_data_frag); 114918b683bfSPaolo Abeni dfrag->offset = offset + sizeof(struct mptcp_data_frag); 1150d9ca1de8SPaolo Abeni dfrag->already_sent = 0; 115118b683bfSPaolo Abeni dfrag->page = pfrag->page; 115218b683bfSPaolo Abeni 115318b683bfSPaolo Abeni return dfrag; 115418b683bfSPaolo Abeni } 115518b683bfSPaolo Abeni 1156caf971dfSPaolo Abeni struct mptcp_sendmsg_info { 1157caf971dfSPaolo Abeni int mss_now; 1158caf971dfSPaolo Abeni int size_goal; 1159d9ca1de8SPaolo Abeni u16 limit; 1160d9ca1de8SPaolo Abeni u16 sent; 1161d9ca1de8SPaolo Abeni unsigned int flags; 1162caf971dfSPaolo Abeni }; 1163caf971dfSPaolo Abeni 11646f8a612aSFlorian Westphal static int mptcp_check_allowed_size(struct mptcp_sock *msk, u64 data_seq, 11656f8a612aSFlorian Westphal int avail_size) 11666f8a612aSFlorian Westphal { 11676f8a612aSFlorian Westphal u64 window_end = mptcp_wnd_end(msk); 11686f8a612aSFlorian Westphal 11696f8a612aSFlorian Westphal if (__mptcp_check_fallback(msk)) 11706f8a612aSFlorian Westphal return avail_size; 11716f8a612aSFlorian Westphal 11726f8a612aSFlorian Westphal if (!before64(data_seq + avail_size, window_end)) { 11736f8a612aSFlorian Westphal u64 allowed_size = window_end - data_seq; 11746f8a612aSFlorian Westphal 11756f8a612aSFlorian Westphal return min_t(unsigned int, allowed_size, avail_size); 11766f8a612aSFlorian Westphal } 11776f8a612aSFlorian Westphal 11786f8a612aSFlorian Westphal return avail_size; 11796f8a612aSFlorian Westphal } 11806f8a612aSFlorian Westphal 1181724cfd2eSPaolo Abeni static bool __mptcp_add_ext(struct sk_buff *skb, gfp_t gfp) 1182724cfd2eSPaolo Abeni { 1183724cfd2eSPaolo Abeni struct skb_ext *mpext = __skb_ext_alloc(gfp); 1184724cfd2eSPaolo Abeni 1185724cfd2eSPaolo Abeni if (!mpext) 1186724cfd2eSPaolo Abeni return false; 1187724cfd2eSPaolo Abeni __skb_ext_set(skb, SKB_EXT_MPTCP, mpext); 1188724cfd2eSPaolo Abeni return true; 1189724cfd2eSPaolo Abeni } 1190724cfd2eSPaolo Abeni 11916e628cd3SPaolo Abeni static struct sk_buff *__mptcp_do_alloc_tx_skb(struct sock *sk, gfp_t gfp) 1192724cfd2eSPaolo Abeni { 1193724cfd2eSPaolo Abeni struct sk_buff *skb; 1194724cfd2eSPaolo Abeni 11956e628cd3SPaolo Abeni skb = alloc_skb_fclone(MAX_TCP_HEADER, gfp); 1196724cfd2eSPaolo Abeni if (likely(skb)) { 11976e628cd3SPaolo Abeni if (likely(__mptcp_add_ext(skb, gfp))) { 1198724cfd2eSPaolo Abeni skb_reserve(skb, MAX_TCP_HEADER); 1199724cfd2eSPaolo Abeni skb->reserved_tailroom = skb->end - skb->tail; 1200724cfd2eSPaolo Abeni return skb; 1201724cfd2eSPaolo Abeni } 1202724cfd2eSPaolo Abeni __kfree_skb(skb); 1203724cfd2eSPaolo Abeni } else { 1204724cfd2eSPaolo Abeni mptcp_enter_memory_pressure(sk); 1205724cfd2eSPaolo Abeni } 1206724cfd2eSPaolo Abeni return NULL; 1207724cfd2eSPaolo Abeni } 1208724cfd2eSPaolo Abeni 1209724cfd2eSPaolo Abeni static bool mptcp_tx_cache_refill(struct sock *sk, int size, 1210724cfd2eSPaolo Abeni struct sk_buff_head *skbs, int *total_ts) 1211724cfd2eSPaolo Abeni { 1212724cfd2eSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 1213724cfd2eSPaolo Abeni struct sk_buff *skb; 1214724cfd2eSPaolo Abeni int space_needed; 1215724cfd2eSPaolo Abeni 1216724cfd2eSPaolo Abeni if (unlikely(tcp_under_memory_pressure(sk))) { 1217724cfd2eSPaolo Abeni mptcp_mem_reclaim_partial(sk); 1218724cfd2eSPaolo Abeni 1219724cfd2eSPaolo Abeni /* under pressure pre-allocate at most a single skb */ 1220724cfd2eSPaolo Abeni if (msk->skb_tx_cache.qlen) 1221724cfd2eSPaolo Abeni return true; 1222724cfd2eSPaolo Abeni space_needed = msk->size_goal_cache; 1223724cfd2eSPaolo Abeni } else { 1224724cfd2eSPaolo Abeni space_needed = msk->tx_pending_data + size - 1225724cfd2eSPaolo Abeni msk->skb_tx_cache.qlen * msk->size_goal_cache; 1226724cfd2eSPaolo Abeni } 1227724cfd2eSPaolo Abeni 1228724cfd2eSPaolo Abeni while (space_needed > 0) { 12296e628cd3SPaolo Abeni skb = __mptcp_do_alloc_tx_skb(sk, sk->sk_allocation); 1230724cfd2eSPaolo Abeni if (unlikely(!skb)) { 1231724cfd2eSPaolo Abeni /* under memory pressure, try to pass the caller a 1232724cfd2eSPaolo Abeni * single skb to allow forward progress 1233724cfd2eSPaolo Abeni */ 1234724cfd2eSPaolo Abeni while (skbs->qlen > 1) { 1235724cfd2eSPaolo Abeni skb = __skb_dequeue_tail(skbs); 1236eaeef1ceSPaolo Abeni *total_ts -= skb->truesize; 1237724cfd2eSPaolo Abeni __kfree_skb(skb); 1238724cfd2eSPaolo Abeni } 1239724cfd2eSPaolo Abeni return skbs->qlen > 0; 1240724cfd2eSPaolo Abeni } 1241724cfd2eSPaolo Abeni 1242724cfd2eSPaolo Abeni *total_ts += skb->truesize; 1243724cfd2eSPaolo Abeni __skb_queue_tail(skbs, skb); 1244724cfd2eSPaolo Abeni space_needed -= msk->size_goal_cache; 1245724cfd2eSPaolo Abeni } 1246724cfd2eSPaolo Abeni return true; 1247724cfd2eSPaolo Abeni } 1248724cfd2eSPaolo Abeni 12496e628cd3SPaolo Abeni static bool __mptcp_alloc_tx_skb(struct sock *sk, struct sock *ssk, gfp_t gfp) 1250724cfd2eSPaolo Abeni { 1251724cfd2eSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 1252724cfd2eSPaolo Abeni struct sk_buff *skb; 1253724cfd2eSPaolo Abeni 1254724cfd2eSPaolo Abeni if (ssk->sk_tx_skb_cache) { 1255724cfd2eSPaolo Abeni skb = ssk->sk_tx_skb_cache; 1256724cfd2eSPaolo Abeni if (unlikely(!skb_ext_find(skb, SKB_EXT_MPTCP) && 12576e628cd3SPaolo Abeni !__mptcp_add_ext(skb, gfp))) 1258724cfd2eSPaolo Abeni return false; 1259724cfd2eSPaolo Abeni return true; 1260724cfd2eSPaolo Abeni } 1261724cfd2eSPaolo Abeni 1262724cfd2eSPaolo Abeni skb = skb_peek(&msk->skb_tx_cache); 1263724cfd2eSPaolo Abeni if (skb) { 1264724cfd2eSPaolo Abeni if (likely(sk_wmem_schedule(ssk, skb->truesize))) { 1265724cfd2eSPaolo Abeni skb = __skb_dequeue(&msk->skb_tx_cache); 1266724cfd2eSPaolo Abeni if (WARN_ON_ONCE(!skb)) 1267724cfd2eSPaolo Abeni return false; 1268724cfd2eSPaolo Abeni 1269724cfd2eSPaolo Abeni mptcp_wmem_uncharge(sk, skb->truesize); 1270724cfd2eSPaolo Abeni ssk->sk_tx_skb_cache = skb; 1271724cfd2eSPaolo Abeni return true; 1272724cfd2eSPaolo Abeni } 1273724cfd2eSPaolo Abeni 1274724cfd2eSPaolo Abeni /* over memory limit, no point to try to allocate a new skb */ 1275724cfd2eSPaolo Abeni return false; 1276724cfd2eSPaolo Abeni } 1277724cfd2eSPaolo Abeni 12786e628cd3SPaolo Abeni skb = __mptcp_do_alloc_tx_skb(sk, gfp); 1279724cfd2eSPaolo Abeni if (!skb) 1280724cfd2eSPaolo Abeni return false; 1281724cfd2eSPaolo Abeni 1282724cfd2eSPaolo Abeni if (likely(sk_wmem_schedule(ssk, skb->truesize))) { 1283724cfd2eSPaolo Abeni ssk->sk_tx_skb_cache = skb; 1284724cfd2eSPaolo Abeni return true; 1285724cfd2eSPaolo Abeni } 1286724cfd2eSPaolo Abeni kfree_skb(skb); 1287724cfd2eSPaolo Abeni return false; 1288724cfd2eSPaolo Abeni } 1289724cfd2eSPaolo Abeni 1290724cfd2eSPaolo Abeni static bool mptcp_must_reclaim_memory(struct sock *sk, struct sock *ssk) 1291724cfd2eSPaolo Abeni { 1292724cfd2eSPaolo Abeni return !ssk->sk_tx_skb_cache && 1293724cfd2eSPaolo Abeni !skb_peek(&mptcp_sk(sk)->skb_tx_cache) && 1294724cfd2eSPaolo Abeni tcp_under_memory_pressure(sk); 1295724cfd2eSPaolo Abeni } 1296724cfd2eSPaolo Abeni 1297724cfd2eSPaolo Abeni static bool mptcp_alloc_tx_skb(struct sock *sk, struct sock *ssk) 1298724cfd2eSPaolo Abeni { 1299724cfd2eSPaolo Abeni if (unlikely(mptcp_must_reclaim_memory(sk, ssk))) 1300724cfd2eSPaolo Abeni mptcp_mem_reclaim_partial(sk); 13016e628cd3SPaolo Abeni return __mptcp_alloc_tx_skb(sk, ssk, sk->sk_allocation); 1302724cfd2eSPaolo Abeni } 1303724cfd2eSPaolo Abeni 130457040755SPaolo Abeni static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk, 1305d9ca1de8SPaolo Abeni struct mptcp_data_frag *dfrag, 1306caf971dfSPaolo Abeni struct mptcp_sendmsg_info *info) 130757040755SPaolo Abeni { 1308d9ca1de8SPaolo Abeni u64 data_seq = dfrag->data_seq + info->sent; 13096d0060f6SMat Martineau struct mptcp_sock *msk = mptcp_sk(sk); 13106f8a612aSFlorian Westphal bool zero_window_probe = false; 13116d0060f6SMat Martineau struct mptcp_ext *mpext = NULL; 131257040755SPaolo Abeni struct sk_buff *skb, *tail; 1313d9ca1de8SPaolo Abeni bool can_collapse = false; 131415e6ca97SPaolo Abeni int size_bias = 0; 1315d9ca1de8SPaolo Abeni int avail_size; 1316724cfd2eSPaolo Abeni size_t ret = 0; 13176d0060f6SMat Martineau 1318e4b61351SGeliang Tang pr_debug("msk=%p ssk=%p sending dfrag at seq=%llu len=%u already sent=%u", 1319d9ca1de8SPaolo Abeni msk, ssk, dfrag->data_seq, dfrag->data_len, info->sent); 13206d0060f6SMat Martineau 1321d9ca1de8SPaolo Abeni /* compute send limit */ 1322d9ca1de8SPaolo Abeni info->mss_now = tcp_send_mss(ssk, &info->size_goal, info->flags); 1323caf971dfSPaolo Abeni avail_size = info->size_goal; 1324724cfd2eSPaolo Abeni msk->size_goal_cache = info->size_goal; 132557040755SPaolo Abeni skb = tcp_write_queue_tail(ssk); 132657040755SPaolo Abeni if (skb) { 132757040755SPaolo Abeni /* Limit the write to the size available in the 132857040755SPaolo Abeni * current skb, if any, so that we create at most a new skb. 132957040755SPaolo Abeni * Explicitly tells TCP internals to avoid collapsing on later 133057040755SPaolo Abeni * queue management operation, to avoid breaking the ext <-> 133157040755SPaolo Abeni * SSN association set here 133257040755SPaolo Abeni */ 1333d9ca1de8SPaolo Abeni mpext = skb_ext_find(skb, SKB_EXT_MPTCP); 1334caf971dfSPaolo Abeni can_collapse = (info->size_goal - skb->len > 0) && 1335d9ca1de8SPaolo Abeni mptcp_skb_can_collapse_to(data_seq, skb, mpext); 133615e6ca97SPaolo Abeni if (!can_collapse) { 133757040755SPaolo Abeni TCP_SKB_CB(skb)->eor = 1; 133815e6ca97SPaolo Abeni } else { 133915e6ca97SPaolo Abeni size_bias = skb->len; 1340caf971dfSPaolo Abeni avail_size = info->size_goal - skb->len; 134157040755SPaolo Abeni } 134215e6ca97SPaolo Abeni } 134318b683bfSPaolo Abeni 13446f8a612aSFlorian Westphal /* Zero window and all data acked? Probe. */ 13456f8a612aSFlorian Westphal avail_size = mptcp_check_allowed_size(msk, data_seq, avail_size); 13466f8a612aSFlorian Westphal if (avail_size == 0) { 13477439d687SPaolo Abeni u64 snd_una = READ_ONCE(msk->snd_una); 13487439d687SPaolo Abeni 13497439d687SPaolo Abeni if (skb || snd_una != msk->snd_nxt) 13506f8a612aSFlorian Westphal return 0; 13516f8a612aSFlorian Westphal zero_window_probe = true; 13527439d687SPaolo Abeni data_seq = snd_una - 1; 13536f8a612aSFlorian Westphal avail_size = 1; 13546f8a612aSFlorian Westphal } 13556f8a612aSFlorian Westphal 1356d9ca1de8SPaolo Abeni if (WARN_ON_ONCE(info->sent > info->limit || 1357d9ca1de8SPaolo Abeni info->limit > dfrag->data_len)) 1358d9ca1de8SPaolo Abeni return 0; 135957040755SPaolo Abeni 1360d9ca1de8SPaolo Abeni ret = info->limit - info->sent; 136115e6ca97SPaolo Abeni tail = tcp_build_frag(ssk, avail_size + size_bias, info->flags, 136215e6ca97SPaolo Abeni dfrag->page, dfrag->offset + info->sent, &ret); 1363e2223995SPaolo Abeni if (!tail) { 1364e2223995SPaolo Abeni tcp_remove_empty_skb(sk, tcp_write_queue_tail(ssk)); 1365e2223995SPaolo Abeni return -ENOMEM; 136635759383SFlorian Westphal } 136718b683bfSPaolo Abeni 1368e2223995SPaolo Abeni /* if the tail skb is still the cached one, collapsing really happened. 136957040755SPaolo Abeni */ 1370e2223995SPaolo Abeni if (skb == tail) { 137115e6ca97SPaolo Abeni TCP_SKB_CB(tail)->tcp_flags &= ~TCPHDR_PSH; 137257040755SPaolo Abeni mpext->data_len += ret; 137315e6ca97SPaolo Abeni WARN_ON_ONCE(!can_collapse); 13746f8a612aSFlorian Westphal WARN_ON_ONCE(zero_window_probe); 137557040755SPaolo Abeni goto out; 137657040755SPaolo Abeni } 137757040755SPaolo Abeni 1378724cfd2eSPaolo Abeni mpext = skb_ext_find(tail, SKB_EXT_MPTCP); 1379724cfd2eSPaolo Abeni if (WARN_ON_ONCE(!mpext)) { 1380724cfd2eSPaolo Abeni /* should never reach here, stream corrupted */ 1381724cfd2eSPaolo Abeni return -EINVAL; 1382724cfd2eSPaolo Abeni } 13836d0060f6SMat Martineau 13846d0060f6SMat Martineau memset(mpext, 0, sizeof(*mpext)); 1385d9ca1de8SPaolo Abeni mpext->data_seq = data_seq; 13866d0060f6SMat Martineau mpext->subflow_seq = mptcp_subflow_ctx(ssk)->rel_write_seq; 13876d0060f6SMat Martineau mpext->data_len = ret; 13886d0060f6SMat Martineau mpext->use_map = 1; 13896d0060f6SMat Martineau mpext->dsn64 = 1; 13906d0060f6SMat Martineau 13916d0060f6SMat Martineau pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d", 13926d0060f6SMat Martineau mpext->data_seq, mpext->subflow_seq, mpext->data_len, 13936d0060f6SMat Martineau mpext->dsn64); 13946d0060f6SMat Martineau 13956f8a612aSFlorian Westphal if (zero_window_probe) { 13966f8a612aSFlorian Westphal mptcp_subflow_ctx(ssk)->rel_write_seq += ret; 13976f8a612aSFlorian Westphal mpext->frozen = 1; 13986f8a612aSFlorian Westphal ret = 0; 13996f8a612aSFlorian Westphal tcp_push_pending_frames(ssk); 14006f8a612aSFlorian Westphal } 140157040755SPaolo Abeni out: 14026d0060f6SMat Martineau mptcp_subflow_ctx(ssk)->rel_write_seq += ret; 14036d0060f6SMat Martineau return ret; 14046d0060f6SMat Martineau } 14056d0060f6SMat Martineau 1406d5f49190SPaolo Abeni #define MPTCP_SEND_BURST_SIZE ((1 << 16) - \ 1407d5f49190SPaolo Abeni sizeof(struct tcphdr) - \ 1408d5f49190SPaolo Abeni MAX_TCP_OPTION_SPACE - \ 1409d5f49190SPaolo Abeni sizeof(struct ipv6hdr) - \ 1410d5f49190SPaolo Abeni sizeof(struct frag_hdr)) 1411d5f49190SPaolo Abeni 1412d5f49190SPaolo Abeni struct subflow_send_info { 1413d5f49190SPaolo Abeni struct sock *ssk; 1414d5f49190SPaolo Abeni u64 ratio; 1415d5f49190SPaolo Abeni }; 1416d5f49190SPaolo Abeni 14175cf92bbaSPaolo Abeni static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk) 1418f296234cSPeter Krystad { 1419d5f49190SPaolo Abeni struct subflow_send_info send_info[2]; 1420f296234cSPeter Krystad struct mptcp_subflow_context *subflow; 1421d5f49190SPaolo Abeni int i, nr_active = 0; 1422d5f49190SPaolo Abeni struct sock *ssk; 1423d5f49190SPaolo Abeni u64 ratio; 1424d5f49190SPaolo Abeni u32 pace; 1425f296234cSPeter Krystad 1426d5f49190SPaolo Abeni sock_owned_by_me((struct sock *)msk); 1427f296234cSPeter Krystad 1428d5f49190SPaolo Abeni if (__mptcp_check_fallback(msk)) { 1429d5f49190SPaolo Abeni if (!msk->first) 1430f296234cSPeter Krystad return NULL; 1431d5f49190SPaolo Abeni return sk_stream_memory_free(msk->first) ? msk->first : NULL; 1432f296234cSPeter Krystad } 1433f296234cSPeter Krystad 1434d5f49190SPaolo Abeni /* re-use last subflow, if the burst allow that */ 1435d5f49190SPaolo Abeni if (msk->last_snd && msk->snd_burst > 0 && 1436d5f49190SPaolo Abeni sk_stream_memory_free(msk->last_snd) && 14375cf92bbaSPaolo Abeni mptcp_subflow_active(mptcp_subflow_ctx(msk->last_snd))) 1438d5f49190SPaolo Abeni return msk->last_snd; 1439f296234cSPeter Krystad 1440d5f49190SPaolo Abeni /* pick the subflow with the lower wmem/wspace ratio */ 1441d5f49190SPaolo Abeni for (i = 0; i < 2; ++i) { 1442d5f49190SPaolo Abeni send_info[i].ssk = NULL; 1443d5f49190SPaolo Abeni send_info[i].ratio = -1; 1444d5f49190SPaolo Abeni } 1445d5f49190SPaolo Abeni mptcp_for_each_subflow(msk, subflow) { 1446e10a9892SGeliang Tang trace_mptcp_subflow_get_send(subflow); 1447d5f49190SPaolo Abeni ssk = mptcp_subflow_tcp_sock(subflow); 1448d5f49190SPaolo Abeni if (!mptcp_subflow_active(subflow)) 1449f296234cSPeter Krystad continue; 1450d5f49190SPaolo Abeni 1451d5f49190SPaolo Abeni nr_active += !subflow->backup; 1452ec369c3aSPaolo Abeni if (!sk_stream_memory_free(subflow->tcp_sock) || !tcp_sk(ssk)->snd_wnd) 1453d5f49190SPaolo Abeni continue; 1454d5f49190SPaolo Abeni 1455d5f49190SPaolo Abeni pace = READ_ONCE(ssk->sk_pacing_rate); 1456d5f49190SPaolo Abeni if (!pace) 1457d5f49190SPaolo Abeni continue; 1458d5f49190SPaolo Abeni 1459d5f49190SPaolo Abeni ratio = div_u64((u64)READ_ONCE(ssk->sk_wmem_queued) << 32, 1460d5f49190SPaolo Abeni pace); 1461d5f49190SPaolo Abeni if (ratio < send_info[subflow->backup].ratio) { 1462d5f49190SPaolo Abeni send_info[subflow->backup].ssk = ssk; 1463d5f49190SPaolo Abeni send_info[subflow->backup].ratio = ratio; 1464d5f49190SPaolo Abeni } 1465f296234cSPeter Krystad } 1466f296234cSPeter Krystad 1467d5f49190SPaolo Abeni /* pick the best backup if no other subflow is active */ 1468d5f49190SPaolo Abeni if (!nr_active) 1469d5f49190SPaolo Abeni send_info[0].ssk = send_info[1].ssk; 1470d5f49190SPaolo Abeni 1471d5f49190SPaolo Abeni if (send_info[0].ssk) { 1472d5f49190SPaolo Abeni msk->last_snd = send_info[0].ssk; 1473d5f49190SPaolo Abeni msk->snd_burst = min_t(int, MPTCP_SEND_BURST_SIZE, 1474ec369c3aSPaolo Abeni tcp_sk(msk->last_snd)->snd_wnd); 1475d5f49190SPaolo Abeni return msk->last_snd; 1476d5f49190SPaolo Abeni } 14775cf92bbaSPaolo Abeni 1478d5f49190SPaolo Abeni return NULL; 1479f296234cSPeter Krystad } 1480f296234cSPeter Krystad 1481d9ca1de8SPaolo Abeni static void mptcp_push_release(struct sock *sk, struct sock *ssk, 1482d9ca1de8SPaolo Abeni struct mptcp_sendmsg_info *info) 1483d9ca1de8SPaolo Abeni { 1484d9ca1de8SPaolo Abeni mptcp_set_timeout(sk, ssk); 1485d9ca1de8SPaolo Abeni tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, info->size_goal); 1486d9ca1de8SPaolo Abeni release_sock(ssk); 1487d9ca1de8SPaolo Abeni } 1488d9ca1de8SPaolo Abeni 1489c2e6048fSPaolo Abeni static void __mptcp_push_pending(struct sock *sk, unsigned int flags) 1490d9ca1de8SPaolo Abeni { 1491d9ca1de8SPaolo Abeni struct sock *prev_ssk = NULL, *ssk = NULL; 1492d9ca1de8SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 1493d9ca1de8SPaolo Abeni struct mptcp_sendmsg_info info = { 1494d9ca1de8SPaolo Abeni .flags = flags, 1495d9ca1de8SPaolo Abeni }; 1496d9ca1de8SPaolo Abeni struct mptcp_data_frag *dfrag; 1497d9ca1de8SPaolo Abeni int len, copied = 0; 1498d9ca1de8SPaolo Abeni 1499d9ca1de8SPaolo Abeni while ((dfrag = mptcp_send_head(sk))) { 1500d9ca1de8SPaolo Abeni info.sent = dfrag->already_sent; 1501d9ca1de8SPaolo Abeni info.limit = dfrag->data_len; 1502d9ca1de8SPaolo Abeni len = dfrag->data_len - dfrag->already_sent; 1503d9ca1de8SPaolo Abeni while (len > 0) { 1504d9ca1de8SPaolo Abeni int ret = 0; 1505d9ca1de8SPaolo Abeni 1506d9ca1de8SPaolo Abeni prev_ssk = ssk; 150778962489SFlorian Westphal mptcp_flush_join_list(msk); 15085cf92bbaSPaolo Abeni ssk = mptcp_subflow_get_send(msk); 1509d9ca1de8SPaolo Abeni 1510d9ca1de8SPaolo Abeni /* try to keep the subflow socket lock across 1511d9ca1de8SPaolo Abeni * consecutive xmit on the same socket 1512d9ca1de8SPaolo Abeni */ 1513d9ca1de8SPaolo Abeni if (ssk != prev_ssk && prev_ssk) 1514d9ca1de8SPaolo Abeni mptcp_push_release(sk, prev_ssk, &info); 1515d9ca1de8SPaolo Abeni if (!ssk) 1516d9ca1de8SPaolo Abeni goto out; 1517d9ca1de8SPaolo Abeni 1518d9ca1de8SPaolo Abeni if (ssk != prev_ssk || !prev_ssk) 1519d9ca1de8SPaolo Abeni lock_sock(ssk); 1520d9ca1de8SPaolo Abeni 1521724cfd2eSPaolo Abeni /* keep it simple and always provide a new skb for the 1522724cfd2eSPaolo Abeni * subflow, even if we will not use it when collapsing 1523724cfd2eSPaolo Abeni * on the pending one 1524724cfd2eSPaolo Abeni */ 1525724cfd2eSPaolo Abeni if (!mptcp_alloc_tx_skb(sk, ssk)) { 1526724cfd2eSPaolo Abeni mptcp_push_release(sk, ssk, &info); 1527724cfd2eSPaolo Abeni goto out; 1528724cfd2eSPaolo Abeni } 1529724cfd2eSPaolo Abeni 1530d9ca1de8SPaolo Abeni ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); 1531d9ca1de8SPaolo Abeni if (ret <= 0) { 1532d9ca1de8SPaolo Abeni mptcp_push_release(sk, ssk, &info); 1533d9ca1de8SPaolo Abeni goto out; 1534d9ca1de8SPaolo Abeni } 1535d9ca1de8SPaolo Abeni 1536d9ca1de8SPaolo Abeni info.sent += ret; 1537d9ca1de8SPaolo Abeni dfrag->already_sent += ret; 1538d9ca1de8SPaolo Abeni msk->snd_nxt += ret; 1539d9ca1de8SPaolo Abeni msk->snd_burst -= ret; 1540724cfd2eSPaolo Abeni msk->tx_pending_data -= ret; 1541d9ca1de8SPaolo Abeni copied += ret; 1542d9ca1de8SPaolo Abeni len -= ret; 1543d9ca1de8SPaolo Abeni } 1544d9ca1de8SPaolo Abeni WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); 1545d9ca1de8SPaolo Abeni } 1546d9ca1de8SPaolo Abeni 1547d9ca1de8SPaolo Abeni /* at this point we held the socket lock for the last subflow we used */ 1548d9ca1de8SPaolo Abeni if (ssk) 1549d9ca1de8SPaolo Abeni mptcp_push_release(sk, ssk, &info); 1550d9ca1de8SPaolo Abeni 1551d9ca1de8SPaolo Abeni out: 1552b680a214SPaolo Abeni if (copied) { 1553d9ca1de8SPaolo Abeni /* start the timer, if it's not pending */ 1554d9ca1de8SPaolo Abeni if (!mptcp_timer_pending(sk)) 1555d9ca1de8SPaolo Abeni mptcp_reset_timer(sk); 1556d9ca1de8SPaolo Abeni __mptcp_check_send_data_fin(sk); 1557d9ca1de8SPaolo Abeni } 1558b680a214SPaolo Abeni } 1559d9ca1de8SPaolo Abeni 15606e628cd3SPaolo Abeni static void __mptcp_subflow_push_pending(struct sock *sk, struct sock *ssk) 15616e628cd3SPaolo Abeni { 15626e628cd3SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 15636e628cd3SPaolo Abeni struct mptcp_sendmsg_info info; 15646e628cd3SPaolo Abeni struct mptcp_data_frag *dfrag; 1565b19bc294SPaolo Abeni struct sock *xmit_ssk; 15666e628cd3SPaolo Abeni int len, copied = 0; 1567b19bc294SPaolo Abeni bool first = true; 15686e628cd3SPaolo Abeni 15696e628cd3SPaolo Abeni info.flags = 0; 15706e628cd3SPaolo Abeni while ((dfrag = mptcp_send_head(sk))) { 15716e628cd3SPaolo Abeni info.sent = dfrag->already_sent; 15726e628cd3SPaolo Abeni info.limit = dfrag->data_len; 15736e628cd3SPaolo Abeni len = dfrag->data_len - dfrag->already_sent; 15746e628cd3SPaolo Abeni while (len > 0) { 15756e628cd3SPaolo Abeni int ret = 0; 15766e628cd3SPaolo Abeni 1577b19bc294SPaolo Abeni /* the caller already invoked the packet scheduler, 1578b19bc294SPaolo Abeni * check for a different subflow usage only after 1579b19bc294SPaolo Abeni * spooling the first chunk of data 1580b19bc294SPaolo Abeni */ 1581b19bc294SPaolo Abeni xmit_ssk = first ? ssk : mptcp_subflow_get_send(mptcp_sk(sk)); 1582b19bc294SPaolo Abeni if (!xmit_ssk) 1583b19bc294SPaolo Abeni goto out; 1584b19bc294SPaolo Abeni if (xmit_ssk != ssk) { 1585b19bc294SPaolo Abeni mptcp_subflow_delegate(mptcp_subflow_ctx(xmit_ssk)); 1586b19bc294SPaolo Abeni goto out; 1587b19bc294SPaolo Abeni } 1588b19bc294SPaolo Abeni 15896e628cd3SPaolo Abeni if (unlikely(mptcp_must_reclaim_memory(sk, ssk))) { 15906e628cd3SPaolo Abeni __mptcp_update_wmem(sk); 15916e628cd3SPaolo Abeni sk_mem_reclaim_partial(sk); 15926e628cd3SPaolo Abeni } 15936e628cd3SPaolo Abeni if (!__mptcp_alloc_tx_skb(sk, ssk, GFP_ATOMIC)) 15946e628cd3SPaolo Abeni goto out; 15956e628cd3SPaolo Abeni 15966e628cd3SPaolo Abeni ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); 15976e628cd3SPaolo Abeni if (ret <= 0) 15986e628cd3SPaolo Abeni goto out; 15996e628cd3SPaolo Abeni 16006e628cd3SPaolo Abeni info.sent += ret; 16016e628cd3SPaolo Abeni dfrag->already_sent += ret; 16026e628cd3SPaolo Abeni msk->snd_nxt += ret; 16036e628cd3SPaolo Abeni msk->snd_burst -= ret; 16046e628cd3SPaolo Abeni msk->tx_pending_data -= ret; 16056e628cd3SPaolo Abeni copied += ret; 16066e628cd3SPaolo Abeni len -= ret; 1607b19bc294SPaolo Abeni first = false; 16086e628cd3SPaolo Abeni } 16096e628cd3SPaolo Abeni WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); 16106e628cd3SPaolo Abeni } 16116e628cd3SPaolo Abeni 16126e628cd3SPaolo Abeni out: 16136e628cd3SPaolo Abeni /* __mptcp_alloc_tx_skb could have released some wmem and we are 16146e628cd3SPaolo Abeni * not going to flush it via release_sock() 16156e628cd3SPaolo Abeni */ 16166e628cd3SPaolo Abeni __mptcp_update_wmem(sk); 16176e628cd3SPaolo Abeni if (copied) { 16186e628cd3SPaolo Abeni mptcp_set_timeout(sk, ssk); 16196e628cd3SPaolo Abeni tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle, 16206e628cd3SPaolo Abeni info.size_goal); 1621d09d818eSPaolo Abeni if (!mptcp_timer_pending(sk)) 1622d09d818eSPaolo Abeni mptcp_reset_timer(sk); 1623d09d818eSPaolo Abeni 16246e628cd3SPaolo Abeni if (msk->snd_data_fin_enable && 16256e628cd3SPaolo Abeni msk->snd_nxt + 1 == msk->write_seq) 16266e628cd3SPaolo Abeni mptcp_schedule_work(sk); 16276e628cd3SPaolo Abeni } 16286e628cd3SPaolo Abeni } 16296e628cd3SPaolo Abeni 16305cf92bbaSPaolo Abeni static void mptcp_set_nospace(struct sock *sk) 16315cf92bbaSPaolo Abeni { 16325cf92bbaSPaolo Abeni /* enable autotune */ 16335cf92bbaSPaolo Abeni set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 16345cf92bbaSPaolo Abeni 16355cf92bbaSPaolo Abeni /* will be cleared on avail space */ 16365cf92bbaSPaolo Abeni set_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags); 16375cf92bbaSPaolo Abeni } 16385cf92bbaSPaolo Abeni 1639f870fa0bSMat Martineau static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1640f870fa0bSMat Martineau { 1641f870fa0bSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk); 164217091708SFlorian Westphal struct page_frag *pfrag; 16436d0060f6SMat Martineau size_t copied = 0; 1644caf971dfSPaolo Abeni int ret = 0; 16456d0060f6SMat Martineau long timeo; 1646f870fa0bSMat Martineau 1647987858e5SPaolo Abeni /* we don't support FASTOPEN yet */ 1648987858e5SPaolo Abeni if (msg->msg_flags & MSG_FASTOPEN) 1649f870fa0bSMat Martineau return -EOPNOTSUPP; 1650f870fa0bSMat Martineau 1651987858e5SPaolo Abeni /* silently ignore everything else */ 1652987858e5SPaolo Abeni msg->msg_flags &= MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL; 1653987858e5SPaolo Abeni 1654e7579d5dSDavide Caratti mptcp_lock_sock(sk, __mptcp_wmem_reserve(sk, min_t(size_t, 1 << 20, len))); 16551954b860SMat Martineau 16561954b860SMat Martineau timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 16571954b860SMat Martineau 16581954b860SMat Martineau if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) { 16591954b860SMat Martineau ret = sk_stream_wait_connect(sk, &timeo); 16601954b860SMat Martineau if (ret) 16611954b860SMat Martineau goto out; 16621954b860SMat Martineau } 16631954b860SMat Martineau 166417091708SFlorian Westphal pfrag = sk_page_frag(sk); 166518b683bfSPaolo Abeni 1666d9ca1de8SPaolo Abeni while (msg_data_left(msg)) { 1667724cfd2eSPaolo Abeni int total_ts, frag_truesize = 0; 1668d9ca1de8SPaolo Abeni struct mptcp_data_frag *dfrag; 1669724cfd2eSPaolo Abeni struct sk_buff_head skbs; 1670d9ca1de8SPaolo Abeni bool dfrag_collapsed; 1671d9ca1de8SPaolo Abeni size_t psize, offset; 1672d9ca1de8SPaolo Abeni 167357baaf28SMat Martineau if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) { 167457baaf28SMat Martineau ret = -EPIPE; 167557baaf28SMat Martineau goto out; 167657baaf28SMat Martineau } 167757baaf28SMat Martineau 1678d9ca1de8SPaolo Abeni /* reuse tail pfrag, if possible, or carve a new one from the 1679d9ca1de8SPaolo Abeni * page allocator 1680fb529e62SFlorian Westphal */ 1681d9ca1de8SPaolo Abeni dfrag = mptcp_pending_tail(sk); 1682d9ca1de8SPaolo Abeni dfrag_collapsed = mptcp_frag_can_collapse_to(msk, pfrag, dfrag); 1683d9ca1de8SPaolo Abeni if (!dfrag_collapsed) { 1684d9ca1de8SPaolo Abeni if (!sk_stream_memory_free(sk)) 1685d9ca1de8SPaolo Abeni goto wait_for_memory; 16866e628cd3SPaolo Abeni 1687d9ca1de8SPaolo Abeni if (!mptcp_page_frag_refill(sk, pfrag)) 1688d9ca1de8SPaolo Abeni goto wait_for_memory; 1689d9ca1de8SPaolo Abeni 1690d9ca1de8SPaolo Abeni dfrag = mptcp_carve_data_frag(msk, pfrag, pfrag->offset); 1691d9ca1de8SPaolo Abeni frag_truesize = dfrag->overhead; 1692fb529e62SFlorian Westphal } 1693fb529e62SFlorian Westphal 1694d9ca1de8SPaolo Abeni /* we do not bound vs wspace, to allow a single packet. 1695d9ca1de8SPaolo Abeni * memory accounting will prevent execessive memory usage 1696d9ca1de8SPaolo Abeni * anyway 1697d9ca1de8SPaolo Abeni */ 1698d9ca1de8SPaolo Abeni offset = dfrag->offset + dfrag->data_len; 1699d9ca1de8SPaolo Abeni psize = pfrag->size - offset; 1700d9ca1de8SPaolo Abeni psize = min_t(size_t, psize, msg_data_left(msg)); 1701724cfd2eSPaolo Abeni total_ts = psize + frag_truesize; 1702724cfd2eSPaolo Abeni __skb_queue_head_init(&skbs); 1703724cfd2eSPaolo Abeni if (!mptcp_tx_cache_refill(sk, psize, &skbs, &total_ts)) 1704d9ca1de8SPaolo Abeni goto wait_for_memory; 1705d9ca1de8SPaolo Abeni 1706724cfd2eSPaolo Abeni if (!mptcp_wmem_alloc(sk, total_ts)) { 1707724cfd2eSPaolo Abeni __skb_queue_purge(&skbs); 1708724cfd2eSPaolo Abeni goto wait_for_memory; 1709724cfd2eSPaolo Abeni } 1710724cfd2eSPaolo Abeni 1711724cfd2eSPaolo Abeni skb_queue_splice_tail(&skbs, &msk->skb_tx_cache); 1712d9ca1de8SPaolo Abeni if (copy_page_from_iter(dfrag->page, offset, psize, 1713d9ca1de8SPaolo Abeni &msg->msg_iter) != psize) { 171487952603SPaolo Abeni mptcp_wmem_uncharge(sk, psize + frag_truesize); 1715d9ca1de8SPaolo Abeni ret = -EFAULT; 1716d9ca1de8SPaolo Abeni goto out; 1717d9ca1de8SPaolo Abeni } 1718d9ca1de8SPaolo Abeni 1719d9ca1de8SPaolo Abeni /* data successfully copied into the write queue */ 1720d9ca1de8SPaolo Abeni copied += psize; 1721d9ca1de8SPaolo Abeni dfrag->data_len += psize; 1722d9ca1de8SPaolo Abeni frag_truesize += psize; 1723d9ca1de8SPaolo Abeni pfrag->offset += frag_truesize; 1724d9ca1de8SPaolo Abeni WRITE_ONCE(msk->write_seq, msk->write_seq + psize); 172513e16037SPaolo Abeni msk->tx_pending_data += psize; 1726d9ca1de8SPaolo Abeni 1727d9ca1de8SPaolo Abeni /* charge data on mptcp pending queue to the msk socket 1728d9ca1de8SPaolo Abeni * Note: we charge such data both to sk and ssk 1729d9ca1de8SPaolo Abeni */ 1730d9ca1de8SPaolo Abeni sk_wmem_queued_add(sk, frag_truesize); 1731d9ca1de8SPaolo Abeni if (!dfrag_collapsed) { 1732d9ca1de8SPaolo Abeni get_page(dfrag->page); 1733d9ca1de8SPaolo Abeni list_add_tail(&dfrag->list, &msk->rtx_queue); 1734d9ca1de8SPaolo Abeni if (!msk->first_pending) 1735d9ca1de8SPaolo Abeni WRITE_ONCE(msk->first_pending, dfrag); 1736d9ca1de8SPaolo Abeni } 1737e4b61351SGeliang Tang pr_debug("msk=%p dfrag at seq=%llu len=%u sent=%u new=%d", msk, 1738d9ca1de8SPaolo Abeni dfrag->data_seq, dfrag->data_len, dfrag->already_sent, 1739d9ca1de8SPaolo Abeni !dfrag_collapsed); 1740d9ca1de8SPaolo Abeni 1741d9ca1de8SPaolo Abeni continue; 1742d9ca1de8SPaolo Abeni 1743d9ca1de8SPaolo Abeni wait_for_memory: 17445cf92bbaSPaolo Abeni mptcp_set_nospace(sk); 1745c2e6048fSPaolo Abeni __mptcp_push_pending(sk, msg->msg_flags); 1746f296234cSPeter Krystad ret = sk_stream_wait_memory(sk, &timeo); 1747f296234cSPeter Krystad if (ret) 1748f296234cSPeter Krystad goto out; 1749cec37a6eSPeter Krystad } 1750cec37a6eSPeter Krystad 175113e16037SPaolo Abeni if (copied) 1752c2e6048fSPaolo Abeni __mptcp_push_pending(sk, msg->msg_flags); 1753da51aef5SPaolo Abeni 17541954b860SMat Martineau out: 1755cec37a6eSPeter Krystad release_sock(sk); 17568555c6bfSPaolo Abeni return copied ? : ret; 1757f870fa0bSMat Martineau } 1758f870fa0bSMat Martineau 17597a6a6cbcSPaolo Abeni static void mptcp_wait_data(struct sock *sk, long *timeo) 17607a6a6cbcSPaolo Abeni { 17617a6a6cbcSPaolo Abeni DEFINE_WAIT_FUNC(wait, woken_wake_function); 17627a6a6cbcSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 17637a6a6cbcSPaolo Abeni 17647a6a6cbcSPaolo Abeni add_wait_queue(sk_sleep(sk), &wait); 17657a6a6cbcSPaolo Abeni sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); 17667a6a6cbcSPaolo Abeni 17677a6a6cbcSPaolo Abeni sk_wait_event(sk, timeo, 17687a6a6cbcSPaolo Abeni test_and_clear_bit(MPTCP_DATA_READY, &msk->flags), &wait); 17697a6a6cbcSPaolo Abeni 17707a6a6cbcSPaolo Abeni sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); 17717a6a6cbcSPaolo Abeni remove_wait_queue(sk_sleep(sk), &wait); 17727a6a6cbcSPaolo Abeni } 17737a6a6cbcSPaolo Abeni 17746771bfd9SFlorian Westphal static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk, 17756771bfd9SFlorian Westphal struct msghdr *msg, 1776d976092cSPaolo Abeni size_t len, int flags) 17776771bfd9SFlorian Westphal { 1778ca4fb892SYonglong Li struct sk_buff *skb, *tmp; 17796771bfd9SFlorian Westphal int copied = 0; 17806771bfd9SFlorian Westphal 1781ca4fb892SYonglong Li skb_queue_walk_safe(&msk->receive_queue, skb, tmp) { 17826771bfd9SFlorian Westphal u32 offset = MPTCP_SKB_CB(skb)->offset; 17836771bfd9SFlorian Westphal u32 data_len = skb->len - offset; 17846771bfd9SFlorian Westphal u32 count = min_t(size_t, len - copied, data_len); 17856771bfd9SFlorian Westphal int err; 17866771bfd9SFlorian Westphal 1787d976092cSPaolo Abeni if (!(flags & MSG_TRUNC)) { 17886771bfd9SFlorian Westphal err = skb_copy_datagram_msg(skb, offset, msg, count); 17896771bfd9SFlorian Westphal if (unlikely(err < 0)) { 17906771bfd9SFlorian Westphal if (!copied) 17916771bfd9SFlorian Westphal return err; 17926771bfd9SFlorian Westphal break; 17936771bfd9SFlorian Westphal } 1794d976092cSPaolo Abeni } 17956771bfd9SFlorian Westphal 17966771bfd9SFlorian Westphal copied += count; 17976771bfd9SFlorian Westphal 17986771bfd9SFlorian Westphal if (count < data_len) { 1799ca4fb892SYonglong Li if (!(flags & MSG_PEEK)) 18006771bfd9SFlorian Westphal MPTCP_SKB_CB(skb)->offset += count; 18016771bfd9SFlorian Westphal break; 18026771bfd9SFlorian Westphal } 18036771bfd9SFlorian Westphal 1804ca4fb892SYonglong Li if (!(flags & MSG_PEEK)) { 180587952603SPaolo Abeni /* we will bulk release the skb memory later */ 180687952603SPaolo Abeni skb->destructor = NULL; 180787952603SPaolo Abeni msk->rmem_released += skb->truesize; 180887952603SPaolo Abeni __skb_unlink(skb, &msk->receive_queue); 18096771bfd9SFlorian Westphal __kfree_skb(skb); 1810ca4fb892SYonglong Li } 18116771bfd9SFlorian Westphal 18126771bfd9SFlorian Westphal if (copied >= len) 18136771bfd9SFlorian Westphal break; 18146771bfd9SFlorian Westphal } 18156771bfd9SFlorian Westphal 18166771bfd9SFlorian Westphal return copied; 18176771bfd9SFlorian Westphal } 18186771bfd9SFlorian Westphal 1819a6b118feSFlorian Westphal /* receive buffer autotuning. See tcp_rcv_space_adjust for more information. 1820a6b118feSFlorian Westphal * 1821a6b118feSFlorian Westphal * Only difference: Use highest rtt estimate of the subflows in use. 1822a6b118feSFlorian Westphal */ 1823a6b118feSFlorian Westphal static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied) 1824a6b118feSFlorian Westphal { 1825a6b118feSFlorian Westphal struct mptcp_subflow_context *subflow; 1826a6b118feSFlorian Westphal struct sock *sk = (struct sock *)msk; 1827a6b118feSFlorian Westphal u32 time, advmss = 1; 1828a6b118feSFlorian Westphal u64 rtt_us, mstamp; 1829a6b118feSFlorian Westphal 1830a6b118feSFlorian Westphal sock_owned_by_me(sk); 1831a6b118feSFlorian Westphal 1832a6b118feSFlorian Westphal if (copied <= 0) 1833a6b118feSFlorian Westphal return; 1834a6b118feSFlorian Westphal 1835a6b118feSFlorian Westphal msk->rcvq_space.copied += copied; 1836a6b118feSFlorian Westphal 1837a6b118feSFlorian Westphal mstamp = div_u64(tcp_clock_ns(), NSEC_PER_USEC); 1838a6b118feSFlorian Westphal time = tcp_stamp_us_delta(mstamp, msk->rcvq_space.time); 1839a6b118feSFlorian Westphal 1840a6b118feSFlorian Westphal rtt_us = msk->rcvq_space.rtt_us; 1841a6b118feSFlorian Westphal if (rtt_us && time < (rtt_us >> 3)) 1842a6b118feSFlorian Westphal return; 1843a6b118feSFlorian Westphal 1844a6b118feSFlorian Westphal rtt_us = 0; 1845a6b118feSFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 1846a6b118feSFlorian Westphal const struct tcp_sock *tp; 1847a6b118feSFlorian Westphal u64 sf_rtt_us; 1848a6b118feSFlorian Westphal u32 sf_advmss; 1849a6b118feSFlorian Westphal 1850a6b118feSFlorian Westphal tp = tcp_sk(mptcp_subflow_tcp_sock(subflow)); 1851a6b118feSFlorian Westphal 1852a6b118feSFlorian Westphal sf_rtt_us = READ_ONCE(tp->rcv_rtt_est.rtt_us); 1853a6b118feSFlorian Westphal sf_advmss = READ_ONCE(tp->advmss); 1854a6b118feSFlorian Westphal 1855a6b118feSFlorian Westphal rtt_us = max(sf_rtt_us, rtt_us); 1856a6b118feSFlorian Westphal advmss = max(sf_advmss, advmss); 1857a6b118feSFlorian Westphal } 1858a6b118feSFlorian Westphal 1859a6b118feSFlorian Westphal msk->rcvq_space.rtt_us = rtt_us; 1860a6b118feSFlorian Westphal if (time < (rtt_us >> 3) || rtt_us == 0) 1861a6b118feSFlorian Westphal return; 1862a6b118feSFlorian Westphal 1863a6b118feSFlorian Westphal if (msk->rcvq_space.copied <= msk->rcvq_space.space) 1864a6b118feSFlorian Westphal goto new_measure; 1865a6b118feSFlorian Westphal 1866a6b118feSFlorian Westphal if (sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf && 1867a6b118feSFlorian Westphal !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { 1868a6b118feSFlorian Westphal int rcvmem, rcvbuf; 1869a6b118feSFlorian Westphal u64 rcvwin, grow; 1870a6b118feSFlorian Westphal 1871a6b118feSFlorian Westphal rcvwin = ((u64)msk->rcvq_space.copied << 1) + 16 * advmss; 1872a6b118feSFlorian Westphal 1873a6b118feSFlorian Westphal grow = rcvwin * (msk->rcvq_space.copied - msk->rcvq_space.space); 1874a6b118feSFlorian Westphal 1875a6b118feSFlorian Westphal do_div(grow, msk->rcvq_space.space); 1876a6b118feSFlorian Westphal rcvwin += (grow << 1); 1877a6b118feSFlorian Westphal 1878a6b118feSFlorian Westphal rcvmem = SKB_TRUESIZE(advmss + MAX_TCP_HEADER); 1879a6b118feSFlorian Westphal while (tcp_win_from_space(sk, rcvmem) < advmss) 1880a6b118feSFlorian Westphal rcvmem += 128; 1881a6b118feSFlorian Westphal 1882a6b118feSFlorian Westphal do_div(rcvwin, advmss); 1883a6b118feSFlorian Westphal rcvbuf = min_t(u64, rcvwin * rcvmem, 1884a6b118feSFlorian Westphal sock_net(sk)->ipv4.sysctl_tcp_rmem[2]); 1885a6b118feSFlorian Westphal 1886a6b118feSFlorian Westphal if (rcvbuf > sk->sk_rcvbuf) { 1887a6b118feSFlorian Westphal u32 window_clamp; 1888a6b118feSFlorian Westphal 1889a6b118feSFlorian Westphal window_clamp = tcp_win_from_space(sk, rcvbuf); 1890a6b118feSFlorian Westphal WRITE_ONCE(sk->sk_rcvbuf, rcvbuf); 1891a6b118feSFlorian Westphal 1892a6b118feSFlorian Westphal /* Make subflows follow along. If we do not do this, we 1893a6b118feSFlorian Westphal * get drops at subflow level if skbs can't be moved to 1894a6b118feSFlorian Westphal * the mptcp rx queue fast enough (announced rcv_win can 1895a6b118feSFlorian Westphal * exceed ssk->sk_rcvbuf). 1896a6b118feSFlorian Westphal */ 1897a6b118feSFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 1898a6b118feSFlorian Westphal struct sock *ssk; 1899c76c6956SPaolo Abeni bool slow; 1900a6b118feSFlorian Westphal 1901a6b118feSFlorian Westphal ssk = mptcp_subflow_tcp_sock(subflow); 1902c76c6956SPaolo Abeni slow = lock_sock_fast(ssk); 1903a6b118feSFlorian Westphal WRITE_ONCE(ssk->sk_rcvbuf, rcvbuf); 1904a6b118feSFlorian Westphal tcp_sk(ssk)->window_clamp = window_clamp; 1905c76c6956SPaolo Abeni tcp_cleanup_rbuf(ssk, 1); 1906c76c6956SPaolo Abeni unlock_sock_fast(ssk, slow); 1907a6b118feSFlorian Westphal } 1908a6b118feSFlorian Westphal } 1909a6b118feSFlorian Westphal } 1910a6b118feSFlorian Westphal 1911a6b118feSFlorian Westphal msk->rcvq_space.space = msk->rcvq_space.copied; 1912a6b118feSFlorian Westphal new_measure: 1913a6b118feSFlorian Westphal msk->rcvq_space.copied = 0; 1914a6b118feSFlorian Westphal msk->rcvq_space.time = mstamp; 1915a6b118feSFlorian Westphal } 1916a6b118feSFlorian Westphal 191787952603SPaolo Abeni static void __mptcp_update_rmem(struct sock *sk) 191887952603SPaolo Abeni { 191987952603SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 192087952603SPaolo Abeni 192187952603SPaolo Abeni if (!msk->rmem_released) 192287952603SPaolo Abeni return; 192387952603SPaolo Abeni 192487952603SPaolo Abeni atomic_sub(msk->rmem_released, &sk->sk_rmem_alloc); 192587952603SPaolo Abeni sk_mem_uncharge(sk, msk->rmem_released); 192687952603SPaolo Abeni msk->rmem_released = 0; 192787952603SPaolo Abeni } 192887952603SPaolo Abeni 192987952603SPaolo Abeni static void __mptcp_splice_receive_queue(struct sock *sk) 193087952603SPaolo Abeni { 193187952603SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 193287952603SPaolo Abeni 193387952603SPaolo Abeni skb_queue_splice_tail_init(&sk->sk_receive_queue, &msk->receive_queue); 193487952603SPaolo Abeni } 193587952603SPaolo Abeni 1936e3859603SPaolo Abeni static bool __mptcp_move_skbs(struct mptcp_sock *msk) 19376771bfd9SFlorian Westphal { 193887952603SPaolo Abeni struct sock *sk = (struct sock *)msk; 19396771bfd9SFlorian Westphal unsigned int moved = 0; 194087952603SPaolo Abeni bool ret, done; 1941d5f49190SPaolo Abeni 194278962489SFlorian Westphal mptcp_flush_join_list(msk); 19436771bfd9SFlorian Westphal do { 19446771bfd9SFlorian Westphal struct sock *ssk = mptcp_subflow_recv_lookup(msk); 194565f49fe7SFlorian Westphal bool slowpath; 19466771bfd9SFlorian Westphal 194787952603SPaolo Abeni /* we can have data pending in the subflows only if the msk 194887952603SPaolo Abeni * receive buffer was full at subflow_data_ready() time, 194987952603SPaolo Abeni * that is an unlikely slow path. 195087952603SPaolo Abeni */ 195187952603SPaolo Abeni if (likely(!ssk)) 19526771bfd9SFlorian Westphal break; 19536771bfd9SFlorian Westphal 195465f49fe7SFlorian Westphal slowpath = lock_sock_fast(ssk); 195587952603SPaolo Abeni mptcp_data_lock(sk); 1956e3859603SPaolo Abeni __mptcp_update_rmem(sk); 19576771bfd9SFlorian Westphal done = __mptcp_move_skbs_from_subflow(msk, ssk, &moved); 195887952603SPaolo Abeni mptcp_data_unlock(sk); 1959e3859603SPaolo Abeni tcp_cleanup_rbuf(ssk, moved); 196065f49fe7SFlorian Westphal unlock_sock_fast(ssk, slowpath); 19616771bfd9SFlorian Westphal } while (!done); 19626771bfd9SFlorian Westphal 196387952603SPaolo Abeni /* acquire the data lock only if some input data is pending */ 196487952603SPaolo Abeni ret = moved > 0; 196587952603SPaolo Abeni if (!RB_EMPTY_ROOT(&msk->out_of_order_queue) || 196687952603SPaolo Abeni !skb_queue_empty_lockless(&sk->sk_receive_queue)) { 196787952603SPaolo Abeni mptcp_data_lock(sk); 196887952603SPaolo Abeni __mptcp_update_rmem(sk); 196987952603SPaolo Abeni ret |= __mptcp_ofo_queue(msk); 197087952603SPaolo Abeni __mptcp_splice_receive_queue(sk); 197187952603SPaolo Abeni mptcp_data_unlock(sk); 1972e3859603SPaolo Abeni mptcp_cleanup_rbuf(msk); 1973ab174ad8SPaolo Abeni } 197487952603SPaolo Abeni if (ret) 197587952603SPaolo Abeni mptcp_check_data_fin((struct sock *)msk); 197687952603SPaolo Abeni return !skb_queue_empty(&msk->receive_queue); 19776771bfd9SFlorian Westphal } 19786771bfd9SFlorian Westphal 1979f870fa0bSMat Martineau static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 1980f870fa0bSMat Martineau int nonblock, int flags, int *addr_len) 1981f870fa0bSMat Martineau { 1982f870fa0bSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk); 1983cec37a6eSPeter Krystad int copied = 0; 19847a6a6cbcSPaolo Abeni int target; 19857a6a6cbcSPaolo Abeni long timeo; 1986f870fa0bSMat Martineau 1987cb9d80f4SPaolo Abeni /* MSG_ERRQUEUE is really a no-op till we support IP_RECVERR */ 1988cb9d80f4SPaolo Abeni if (unlikely(flags & MSG_ERRQUEUE)) 1989cb9d80f4SPaolo Abeni return inet_recv_error(sk, msg, len, addr_len); 1990cb9d80f4SPaolo Abeni 199187952603SPaolo Abeni mptcp_lock_sock(sk, __mptcp_splice_receive_queue(sk)); 1992fd897679SPaolo Abeni if (unlikely(sk->sk_state == TCP_LISTEN)) { 1993fd897679SPaolo Abeni copied = -ENOTCONN; 1994fd897679SPaolo Abeni goto out_err; 1995fd897679SPaolo Abeni } 1996fd897679SPaolo Abeni 19977a6a6cbcSPaolo Abeni timeo = sock_rcvtimeo(sk, nonblock); 19987a6a6cbcSPaolo Abeni 19997a6a6cbcSPaolo Abeni len = min_t(size_t, len, INT_MAX); 20007a6a6cbcSPaolo Abeni target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); 20017a6a6cbcSPaolo Abeni 200205e3eceaSEric Dumazet while (copied < len) { 2003e3859603SPaolo Abeni int bytes_read; 20047a6a6cbcSPaolo Abeni 2005d976092cSPaolo Abeni bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied, flags); 20066771bfd9SFlorian Westphal if (unlikely(bytes_read < 0)) { 20077a6a6cbcSPaolo Abeni if (!copied) 20087a6a6cbcSPaolo Abeni copied = bytes_read; 20096771bfd9SFlorian Westphal goto out_err; 2010cec37a6eSPeter Krystad } 2011cec37a6eSPeter Krystad 20127a6a6cbcSPaolo Abeni copied += bytes_read; 20137a6a6cbcSPaolo Abeni 2014ea4ca586SPaolo Abeni /* be sure to advertise window change */ 2015fd897679SPaolo Abeni mptcp_cleanup_rbuf(msk); 2016ea4ca586SPaolo Abeni 2017e3859603SPaolo Abeni if (skb_queue_empty(&msk->receive_queue) && __mptcp_move_skbs(msk)) 2018e3859603SPaolo Abeni continue; 2019e3859603SPaolo Abeni 20207a6a6cbcSPaolo Abeni /* only the master socket status is relevant here. The exit 20217a6a6cbcSPaolo Abeni * conditions mirror closely tcp_recvmsg() 20227a6a6cbcSPaolo Abeni */ 20237a6a6cbcSPaolo Abeni if (copied >= target) 20247a6a6cbcSPaolo Abeni break; 20257a6a6cbcSPaolo Abeni 20267a6a6cbcSPaolo Abeni if (copied) { 20277a6a6cbcSPaolo Abeni if (sk->sk_err || 20287a6a6cbcSPaolo Abeni sk->sk_state == TCP_CLOSE || 20297a6a6cbcSPaolo Abeni (sk->sk_shutdown & RCV_SHUTDOWN) || 20307a6a6cbcSPaolo Abeni !timeo || 20317a6a6cbcSPaolo Abeni signal_pending(current)) 20327a6a6cbcSPaolo Abeni break; 20337a6a6cbcSPaolo Abeni } else { 20347a6a6cbcSPaolo Abeni if (sk->sk_err) { 20357a6a6cbcSPaolo Abeni copied = sock_error(sk); 20367a6a6cbcSPaolo Abeni break; 20377a6a6cbcSPaolo Abeni } 20387a6a6cbcSPaolo Abeni 20395969856aSPaolo Abeni if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags)) 20405969856aSPaolo Abeni mptcp_check_for_eof(msk); 20415969856aSPaolo Abeni 204287952603SPaolo Abeni if (sk->sk_shutdown & RCV_SHUTDOWN) { 204387952603SPaolo Abeni /* race breaker: the shutdown could be after the 204487952603SPaolo Abeni * previous receive queue check 204587952603SPaolo Abeni */ 2046e3859603SPaolo Abeni if (__mptcp_move_skbs(msk)) 204787952603SPaolo Abeni continue; 20487a6a6cbcSPaolo Abeni break; 204987952603SPaolo Abeni } 20507a6a6cbcSPaolo Abeni 20517a6a6cbcSPaolo Abeni if (sk->sk_state == TCP_CLOSE) { 20527a6a6cbcSPaolo Abeni copied = -ENOTCONN; 20537a6a6cbcSPaolo Abeni break; 20547a6a6cbcSPaolo Abeni } 20557a6a6cbcSPaolo Abeni 20567a6a6cbcSPaolo Abeni if (!timeo) { 20577a6a6cbcSPaolo Abeni copied = -EAGAIN; 20587a6a6cbcSPaolo Abeni break; 20597a6a6cbcSPaolo Abeni } 20607a6a6cbcSPaolo Abeni 20617a6a6cbcSPaolo Abeni if (signal_pending(current)) { 20627a6a6cbcSPaolo Abeni copied = sock_intr_errno(timeo); 20637a6a6cbcSPaolo Abeni break; 20647a6a6cbcSPaolo Abeni } 20657a6a6cbcSPaolo Abeni } 20667a6a6cbcSPaolo Abeni 20677a6a6cbcSPaolo Abeni pr_debug("block timeout %ld", timeo); 20687a6a6cbcSPaolo Abeni mptcp_wait_data(sk, &timeo); 20697a6a6cbcSPaolo Abeni } 20707a6a6cbcSPaolo Abeni 207187952603SPaolo Abeni if (skb_queue_empty_lockless(&sk->sk_receive_queue) && 207287952603SPaolo Abeni skb_queue_empty(&msk->receive_queue)) { 20736771bfd9SFlorian Westphal /* entire backlog drained, clear DATA_READY. */ 20747a6a6cbcSPaolo Abeni clear_bit(MPTCP_DATA_READY, &msk->flags); 20757a6a6cbcSPaolo Abeni 20766771bfd9SFlorian Westphal /* .. race-breaker: ssk might have gotten new data 20776771bfd9SFlorian Westphal * after last __mptcp_move_skbs() returned false. 20787a6a6cbcSPaolo Abeni */ 2079e3859603SPaolo Abeni if (unlikely(__mptcp_move_skbs(msk))) 20806771bfd9SFlorian Westphal set_bit(MPTCP_DATA_READY, &msk->flags); 20816771bfd9SFlorian Westphal } else if (unlikely(!test_bit(MPTCP_DATA_READY, &msk->flags))) { 20826771bfd9SFlorian Westphal /* data to read but mptcp_wait_data() cleared DATA_READY */ 20837a6a6cbcSPaolo Abeni set_bit(MPTCP_DATA_READY, &msk->flags); 20847a6a6cbcSPaolo Abeni } 20856771bfd9SFlorian Westphal out_err: 20866719331cSPaolo Abeni pr_debug("msk=%p data_ready=%d rx queue empty=%d copied=%d", 20876719331cSPaolo Abeni msk, test_bit(MPTCP_DATA_READY, &msk->flags), 208887952603SPaolo Abeni skb_queue_empty_lockless(&sk->sk_receive_queue), copied); 2089ca4fb892SYonglong Li if (!(flags & MSG_PEEK)) 2090a6b118feSFlorian Westphal mptcp_rcv_space_adjust(msk, copied); 2091a6b118feSFlorian Westphal 2092cec37a6eSPeter Krystad release_sock(sk); 2093cec37a6eSPeter Krystad return copied; 2094cec37a6eSPeter Krystad } 2095cec37a6eSPeter Krystad 2096b51f9b80SPaolo Abeni static void mptcp_retransmit_timer(struct timer_list *t) 2097b51f9b80SPaolo Abeni { 2098b51f9b80SPaolo Abeni struct inet_connection_sock *icsk = from_timer(icsk, t, 2099b51f9b80SPaolo Abeni icsk_retransmit_timer); 2100b51f9b80SPaolo Abeni struct sock *sk = &icsk->icsk_inet.sk; 21012d6f5a2bSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 2102b51f9b80SPaolo Abeni 2103b51f9b80SPaolo Abeni bh_lock_sock(sk); 2104b51f9b80SPaolo Abeni if (!sock_owned_by_user(sk)) { 21052d6f5a2bSPaolo Abeni /* we need a process context to retransmit */ 21062d6f5a2bSPaolo Abeni if (!test_and_set_bit(MPTCP_WORK_RTX, &msk->flags)) 21072d6f5a2bSPaolo Abeni mptcp_schedule_work(sk); 2108b51f9b80SPaolo Abeni } else { 2109b51f9b80SPaolo Abeni /* delegate our work to tcp_release_cb() */ 21102d6f5a2bSPaolo Abeni set_bit(MPTCP_RETRANSMIT, &msk->flags); 2111b51f9b80SPaolo Abeni } 2112b51f9b80SPaolo Abeni bh_unlock_sock(sk); 2113b51f9b80SPaolo Abeni sock_put(sk); 2114b51f9b80SPaolo Abeni } 2115b51f9b80SPaolo Abeni 2116e16163b6SPaolo Abeni static void mptcp_timeout_timer(struct timer_list *t) 2117e16163b6SPaolo Abeni { 2118e16163b6SPaolo Abeni struct sock *sk = from_timer(sk, t, sk_timer); 2119e16163b6SPaolo Abeni 2120e16163b6SPaolo Abeni mptcp_schedule_work(sk); 2121b6d69fc8SFlorian Westphal sock_put(sk); 2122e16163b6SPaolo Abeni } 2123e16163b6SPaolo Abeni 21243b1d6210SPaolo Abeni /* Find an idle subflow. Return NULL if there is unacked data at tcp 21253b1d6210SPaolo Abeni * level. 21263b1d6210SPaolo Abeni * 21273b1d6210SPaolo Abeni * A backup subflow is returned only if that is the only kind available. 21283b1d6210SPaolo Abeni */ 21293b1d6210SPaolo Abeni static struct sock *mptcp_subflow_get_retrans(const struct mptcp_sock *msk) 21303b1d6210SPaolo Abeni { 21313b1d6210SPaolo Abeni struct mptcp_subflow_context *subflow; 21323b1d6210SPaolo Abeni struct sock *backup = NULL; 21333b1d6210SPaolo Abeni 21343b1d6210SPaolo Abeni sock_owned_by_me((const struct sock *)msk); 21353b1d6210SPaolo Abeni 2136d5f49190SPaolo Abeni if (__mptcp_check_fallback(msk)) 2137d9ca1de8SPaolo Abeni return NULL; 2138d5f49190SPaolo Abeni 21393b1d6210SPaolo Abeni mptcp_for_each_subflow(msk, subflow) { 21403b1d6210SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 21413b1d6210SPaolo Abeni 2142d5f49190SPaolo Abeni if (!mptcp_subflow_active(subflow)) 2143d5f49190SPaolo Abeni continue; 2144d5f49190SPaolo Abeni 21453b1d6210SPaolo Abeni /* still data outstanding at TCP level? Don't retransmit. */ 2146860975c6SFlorian Westphal if (!tcp_write_queue_empty(ssk)) { 2147860975c6SFlorian Westphal if (inet_csk(ssk)->icsk_ca_state >= TCP_CA_Loss) 2148860975c6SFlorian Westphal continue; 21493b1d6210SPaolo Abeni return NULL; 2150860975c6SFlorian Westphal } 21513b1d6210SPaolo Abeni 21523b1d6210SPaolo Abeni if (subflow->backup) { 21533b1d6210SPaolo Abeni if (!backup) 21543b1d6210SPaolo Abeni backup = ssk; 21553b1d6210SPaolo Abeni continue; 21563b1d6210SPaolo Abeni } 21573b1d6210SPaolo Abeni 21583b1d6210SPaolo Abeni return ssk; 21593b1d6210SPaolo Abeni } 21603b1d6210SPaolo Abeni 21613b1d6210SPaolo Abeni return backup; 21623b1d6210SPaolo Abeni } 21633b1d6210SPaolo Abeni 216417aee05dSFlorian Westphal static void mptcp_dispose_initial_subflow(struct mptcp_sock *msk) 216517aee05dSFlorian Westphal { 216617aee05dSFlorian Westphal if (msk->subflow) { 216717aee05dSFlorian Westphal iput(SOCK_INODE(msk->subflow)); 216817aee05dSFlorian Westphal msk->subflow = NULL; 216917aee05dSFlorian Westphal } 217017aee05dSFlorian Westphal } 217117aee05dSFlorian Westphal 2172cec37a6eSPeter Krystad /* subflow sockets can be either outgoing (connect) or incoming 2173cec37a6eSPeter Krystad * (accept). 2174cec37a6eSPeter Krystad * 2175cec37a6eSPeter Krystad * Outgoing subflows use in-kernel sockets. 2176cec37a6eSPeter Krystad * Incoming subflows do not have their own 'struct socket' allocated, 2177cec37a6eSPeter Krystad * so we need to use tcp_close() after detaching them from the mptcp 2178cec37a6eSPeter Krystad * parent socket. 2179cec37a6eSPeter Krystad */ 2180a141e02eSFlorian Westphal static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, 2181e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow) 2182cec37a6eSPeter Krystad { 2183e0be4931SFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 2184e0be4931SFlorian Westphal 2185cec37a6eSPeter Krystad list_del(&subflow->node); 2186cec37a6eSPeter Krystad 21873f8b2667SPaolo Abeni lock_sock_nested(ssk, SINGLE_DEPTH_NESTING); 2188e16163b6SPaolo Abeni 2189e16163b6SPaolo Abeni /* if we are invoked by the msk cleanup code, the subflow is 2190e16163b6SPaolo Abeni * already orphaned 2191e16163b6SPaolo Abeni */ 2192866f26f2SPaolo Abeni if (ssk->sk_socket) 2193e16163b6SPaolo Abeni sock_orphan(ssk); 2194e16163b6SPaolo Abeni 2195d7b1bfd0SPaolo Abeni subflow->disposable = 1; 2196d7b1bfd0SPaolo Abeni 2197e16163b6SPaolo Abeni /* if ssk hit tcp_done(), tcp_cleanup_ulp() cleared the related ops 2198e16163b6SPaolo Abeni * the ssk has been already destroyed, we just need to release the 2199e16163b6SPaolo Abeni * reference owned by msk; 2200e16163b6SPaolo Abeni */ 2201e16163b6SPaolo Abeni if (!inet_csk(ssk)->icsk_ulp_ops) { 2202e16163b6SPaolo Abeni kfree_rcu(subflow, rcu); 2203e16163b6SPaolo Abeni } else { 2204d7b1bfd0SPaolo Abeni /* otherwise tcp will dispose of the ssk and subflow ctx */ 2205e16163b6SPaolo Abeni __tcp_close(ssk, 0); 2206e16163b6SPaolo Abeni 2207e16163b6SPaolo Abeni /* close acquired an extra ref */ 2208e16163b6SPaolo Abeni __sock_put(ssk); 2209e16163b6SPaolo Abeni } 2210e16163b6SPaolo Abeni release_sock(ssk); 2211e16163b6SPaolo Abeni 2212e16163b6SPaolo Abeni sock_put(ssk); 2213e0be4931SFlorian Westphal 2214e0be4931SFlorian Westphal if (ssk == msk->last_snd) 2215e0be4931SFlorian Westphal msk->last_snd = NULL; 221617aee05dSFlorian Westphal 2217c8fe62f0SFlorian Westphal if (ssk == msk->ack_hint) 2218c8fe62f0SFlorian Westphal msk->ack_hint = NULL; 2219c8fe62f0SFlorian Westphal 2220c8fe62f0SFlorian Westphal if (ssk == msk->first) 2221c8fe62f0SFlorian Westphal msk->first = NULL; 2222c8fe62f0SFlorian Westphal 222317aee05dSFlorian Westphal if (msk->subflow && ssk == msk->subflow->sk) 222417aee05dSFlorian Westphal mptcp_dispose_initial_subflow(msk); 2225f870fa0bSMat Martineau } 2226f870fa0bSMat Martineau 2227a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 2228a141e02eSFlorian Westphal struct mptcp_subflow_context *subflow) 2229a141e02eSFlorian Westphal { 2230b911c97cSFlorian Westphal if (sk->sk_state == TCP_ESTABLISHED) 2231b911c97cSFlorian Westphal mptcp_event(MPTCP_EVENT_SUB_CLOSED, mptcp_sk(sk), ssk, GFP_KERNEL); 2232a141e02eSFlorian Westphal __mptcp_close_ssk(sk, ssk, subflow); 2233a141e02eSFlorian Westphal } 2234a141e02eSFlorian Westphal 2235dc24f8b4SPaolo Abeni static unsigned int mptcp_sync_mss(struct sock *sk, u32 pmtu) 2236dc24f8b4SPaolo Abeni { 2237dc24f8b4SPaolo Abeni return 0; 2238dc24f8b4SPaolo Abeni } 2239dc24f8b4SPaolo Abeni 22400e4f35d7SPaolo Abeni static void __mptcp_close_subflow(struct mptcp_sock *msk) 22410e4f35d7SPaolo Abeni { 22420e4f35d7SPaolo Abeni struct mptcp_subflow_context *subflow, *tmp; 22430e4f35d7SPaolo Abeni 22443abc05d9SFlorian Westphal might_sleep(); 22453abc05d9SFlorian Westphal 22460e4f35d7SPaolo Abeni list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { 22470e4f35d7SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 22480e4f35d7SPaolo Abeni 22490e4f35d7SPaolo Abeni if (inet_sk_state_load(ssk) != TCP_CLOSE) 22500e4f35d7SPaolo Abeni continue; 22510e4f35d7SPaolo Abeni 225240947e13SFlorian Westphal /* 'subflow_data_ready' will re-sched once rx queue is empty */ 225340947e13SFlorian Westphal if (!skb_queue_empty_lockless(&ssk->sk_receive_queue)) 225440947e13SFlorian Westphal continue; 225540947e13SFlorian Westphal 2256a141e02eSFlorian Westphal mptcp_close_ssk((struct sock *)msk, ssk, subflow); 22570e4f35d7SPaolo Abeni } 22580e4f35d7SPaolo Abeni } 22590e4f35d7SPaolo Abeni 2260e16163b6SPaolo Abeni static bool mptcp_check_close_timeout(const struct sock *sk) 2261e16163b6SPaolo Abeni { 2262e16163b6SPaolo Abeni s32 delta = tcp_jiffies32 - inet_csk(sk)->icsk_mtup.probe_timestamp; 2263e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow; 2264e16163b6SPaolo Abeni 2265e16163b6SPaolo Abeni if (delta >= TCP_TIMEWAIT_LEN) 2266e16163b6SPaolo Abeni return true; 2267e16163b6SPaolo Abeni 2268e16163b6SPaolo Abeni /* if all subflows are in closed status don't bother with additional 2269e16163b6SPaolo Abeni * timeout 2270e16163b6SPaolo Abeni */ 2271e16163b6SPaolo Abeni mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 2272e16163b6SPaolo Abeni if (inet_sk_state_load(mptcp_subflow_tcp_sock(subflow)) != 2273e16163b6SPaolo Abeni TCP_CLOSE) 2274e16163b6SPaolo Abeni return false; 2275e16163b6SPaolo Abeni } 2276e16163b6SPaolo Abeni return true; 2277e16163b6SPaolo Abeni } 2278e16163b6SPaolo Abeni 227950c504a2SFlorian Westphal static void mptcp_check_fastclose(struct mptcp_sock *msk) 228050c504a2SFlorian Westphal { 228150c504a2SFlorian Westphal struct mptcp_subflow_context *subflow, *tmp; 228250c504a2SFlorian Westphal struct sock *sk = &msk->sk.icsk_inet.sk; 228350c504a2SFlorian Westphal 228450c504a2SFlorian Westphal if (likely(!READ_ONCE(msk->rcv_fastclose))) 228550c504a2SFlorian Westphal return; 228650c504a2SFlorian Westphal 228750c504a2SFlorian Westphal mptcp_token_destroy(msk); 228850c504a2SFlorian Westphal 228950c504a2SFlorian Westphal list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { 229050c504a2SFlorian Westphal struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow); 229150c504a2SFlorian Westphal 229250c504a2SFlorian Westphal lock_sock(tcp_sk); 229350c504a2SFlorian Westphal if (tcp_sk->sk_state != TCP_CLOSE) { 229450c504a2SFlorian Westphal tcp_send_active_reset(tcp_sk, GFP_ATOMIC); 229550c504a2SFlorian Westphal tcp_set_state(tcp_sk, TCP_CLOSE); 229650c504a2SFlorian Westphal } 229750c504a2SFlorian Westphal release_sock(tcp_sk); 229850c504a2SFlorian Westphal } 229950c504a2SFlorian Westphal 230050c504a2SFlorian Westphal inet_sk_state_store(sk, TCP_CLOSE); 230150c504a2SFlorian Westphal sk->sk_shutdown = SHUTDOWN_MASK; 230250c504a2SFlorian Westphal smp_mb__before_atomic(); /* SHUTDOWN must be visible first */ 230350c504a2SFlorian Westphal set_bit(MPTCP_DATA_READY, &msk->flags); 230450c504a2SFlorian Westphal set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags); 230550c504a2SFlorian Westphal 230650c504a2SFlorian Westphal mptcp_close_wake_up(sk); 230750c504a2SFlorian Westphal } 230850c504a2SFlorian Westphal 23092948d0a1SPaolo Abeni static void __mptcp_retrans(struct sock *sk) 231080992017SPaolo Abeni { 23112948d0a1SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 2312caf971dfSPaolo Abeni struct mptcp_sendmsg_info info = {}; 23133b1d6210SPaolo Abeni struct mptcp_data_frag *dfrag; 23143b1d6210SPaolo Abeni size_t copied = 0; 23152948d0a1SPaolo Abeni struct sock *ssk; 23162948d0a1SPaolo Abeni int ret; 23172948d0a1SPaolo Abeni 2318b5941f06SPaolo Abeni mptcp_clean_una_wakeup(sk); 23192948d0a1SPaolo Abeni dfrag = mptcp_rtx_head(sk); 23206477dd39SMat Martineau if (!dfrag) { 23216477dd39SMat Martineau if (mptcp_data_fin_enabled(msk)) { 23226477dd39SMat Martineau struct inet_connection_sock *icsk = inet_csk(sk); 23236477dd39SMat Martineau 23246477dd39SMat Martineau icsk->icsk_retransmits++; 23256477dd39SMat Martineau mptcp_set_datafin_timeout(sk); 23266477dd39SMat Martineau mptcp_send_ack(msk); 23276477dd39SMat Martineau 23286477dd39SMat Martineau goto reset_timer; 23296477dd39SMat Martineau } 23306477dd39SMat Martineau 23312948d0a1SPaolo Abeni return; 23326477dd39SMat Martineau } 23332948d0a1SPaolo Abeni 23342948d0a1SPaolo Abeni ssk = mptcp_subflow_get_retrans(msk); 23352948d0a1SPaolo Abeni if (!ssk) 23362948d0a1SPaolo Abeni goto reset_timer; 23372948d0a1SPaolo Abeni 23382948d0a1SPaolo Abeni lock_sock(ssk); 23392948d0a1SPaolo Abeni 23402948d0a1SPaolo Abeni /* limit retransmission to the bytes already sent on some subflows */ 23412948d0a1SPaolo Abeni info.sent = 0; 23422948d0a1SPaolo Abeni info.limit = dfrag->already_sent; 23432948d0a1SPaolo Abeni while (info.sent < dfrag->already_sent) { 23442948d0a1SPaolo Abeni if (!mptcp_alloc_tx_skb(sk, ssk)) 23452948d0a1SPaolo Abeni break; 23462948d0a1SPaolo Abeni 23472948d0a1SPaolo Abeni ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info); 23482948d0a1SPaolo Abeni if (ret <= 0) 23492948d0a1SPaolo Abeni break; 23502948d0a1SPaolo Abeni 23512948d0a1SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RETRANSSEGS); 23522948d0a1SPaolo Abeni copied += ret; 23532948d0a1SPaolo Abeni info.sent += ret; 23542948d0a1SPaolo Abeni } 23552948d0a1SPaolo Abeni if (copied) 23562948d0a1SPaolo Abeni tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle, 23572948d0a1SPaolo Abeni info.size_goal); 23582948d0a1SPaolo Abeni 23592948d0a1SPaolo Abeni mptcp_set_timeout(sk, ssk); 23602948d0a1SPaolo Abeni release_sock(ssk); 23612948d0a1SPaolo Abeni 23622948d0a1SPaolo Abeni reset_timer: 23632948d0a1SPaolo Abeni if (!mptcp_timer_pending(sk)) 23642948d0a1SPaolo Abeni mptcp_reset_timer(sk); 23652948d0a1SPaolo Abeni } 23662948d0a1SPaolo Abeni 23672948d0a1SPaolo Abeni static void mptcp_worker(struct work_struct *work) 23682948d0a1SPaolo Abeni { 23692948d0a1SPaolo Abeni struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work); 23702948d0a1SPaolo Abeni struct sock *sk = &msk->sk.icsk_inet.sk; 23712948d0a1SPaolo Abeni int state; 237280992017SPaolo Abeni 237380992017SPaolo Abeni lock_sock(sk); 2374e16163b6SPaolo Abeni state = sk->sk_state; 2375e16163b6SPaolo Abeni if (unlikely(state == TCP_CLOSE)) 2376e16163b6SPaolo Abeni goto unlock; 2377e16163b6SPaolo Abeni 237843b54c6eSMat Martineau mptcp_check_data_fin_ack(sk); 237978962489SFlorian Westphal mptcp_flush_join_list(msk); 238050c504a2SFlorian Westphal 238150c504a2SFlorian Westphal mptcp_check_fastclose(msk); 238250c504a2SFlorian Westphal 2383b416268bSFlorian Westphal if (msk->pm.status) 2384e9801430SFlorian Westphal mptcp_pm_nl_work(msk); 2385b416268bSFlorian Westphal 238659832e24SFlorian Westphal if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags)) 238759832e24SFlorian Westphal mptcp_check_for_eof(msk); 238859832e24SFlorian Westphal 23896e628cd3SPaolo Abeni __mptcp_check_send_data_fin(sk); 239043b54c6eSMat Martineau mptcp_check_data_fin(sk); 239143b54c6eSMat Martineau 2392341c6524SPaolo Abeni /* There is no point in keeping around an orphaned sk timedout or 2393341c6524SPaolo Abeni * closed, but we need the msk around to reply to incoming DATA_FIN, 2394341c6524SPaolo Abeni * even if it is orphaned and in FIN_WAIT2 state 2395e16163b6SPaolo Abeni */ 2396e16163b6SPaolo Abeni if (sock_flag(sk, SOCK_DEAD) && 2397341c6524SPaolo Abeni (mptcp_check_close_timeout(sk) || sk->sk_state == TCP_CLOSE)) { 2398e16163b6SPaolo Abeni inet_sk_state_store(sk, TCP_CLOSE); 2399e16163b6SPaolo Abeni __mptcp_destroy_sock(sk); 2400e16163b6SPaolo Abeni goto unlock; 2401e16163b6SPaolo Abeni } 2402e16163b6SPaolo Abeni 2403b263b0d7SFlorian Westphal if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags)) 2404b263b0d7SFlorian Westphal __mptcp_close_subflow(msk); 2405b263b0d7SFlorian Westphal 24062948d0a1SPaolo Abeni if (test_and_clear_bit(MPTCP_WORK_RTX, &msk->flags)) 24072948d0a1SPaolo Abeni __mptcp_retrans(sk); 24083b1d6210SPaolo Abeni 24093b1d6210SPaolo Abeni unlock: 241080992017SPaolo Abeni release_sock(sk); 241180992017SPaolo Abeni sock_put(sk); 241280992017SPaolo Abeni } 241380992017SPaolo Abeni 2414784325e9SMatthieu Baerts static int __mptcp_init_sock(struct sock *sk) 2415f870fa0bSMat Martineau { 2416cec37a6eSPeter Krystad struct mptcp_sock *msk = mptcp_sk(sk); 2417cec37a6eSPeter Krystad 2418ec3edaa7SPeter Krystad spin_lock_init(&msk->join_list_lock); 2419ec3edaa7SPeter Krystad 2420cec37a6eSPeter Krystad INIT_LIST_HEAD(&msk->conn_list); 2421ec3edaa7SPeter Krystad INIT_LIST_HEAD(&msk->join_list); 242218b683bfSPaolo Abeni INIT_LIST_HEAD(&msk->rtx_queue); 242380992017SPaolo Abeni INIT_WORK(&msk->work, mptcp_worker); 242487952603SPaolo Abeni __skb_queue_head_init(&msk->receive_queue); 2425724cfd2eSPaolo Abeni __skb_queue_head_init(&msk->skb_tx_cache); 2426ab174ad8SPaolo Abeni msk->out_of_order_queue = RB_ROOT; 2427f0e6a4cfSPaolo Abeni msk->first_pending = NULL; 2428e93da928SPaolo Abeni msk->wmem_reserved = 0; 242987952603SPaolo Abeni msk->rmem_released = 0; 2430724cfd2eSPaolo Abeni msk->tx_pending_data = 0; 2431724cfd2eSPaolo Abeni msk->size_goal_cache = TCP_BASE_MSS; 2432cec37a6eSPeter Krystad 2433ea4ca586SPaolo Abeni msk->ack_hint = NULL; 24348ab183deSPaolo Abeni msk->first = NULL; 2435dc24f8b4SPaolo Abeni inet_csk(sk)->icsk_sync_mss = mptcp_sync_mss; 24368ab183deSPaolo Abeni 24371b1c7a0eSPeter Krystad mptcp_pm_data_init(msk); 24381b1c7a0eSPeter Krystad 2439b51f9b80SPaolo Abeni /* re-use the csk retrans timer for MPTCP-level retrans */ 2440b51f9b80SPaolo Abeni timer_setup(&msk->sk.icsk_retransmit_timer, mptcp_retransmit_timer, 0); 2441e16163b6SPaolo Abeni timer_setup(&sk->sk_timer, mptcp_timeout_timer, 0); 2442aa1fbd94SFlorian Westphal 2443f870fa0bSMat Martineau return 0; 2444f870fa0bSMat Martineau } 2445f870fa0bSMat Martineau 2446784325e9SMatthieu Baerts static int mptcp_init_sock(struct sock *sk) 2447784325e9SMatthieu Baerts { 244820b5759fSPaolo Abeni struct inet_connection_sock *icsk = inet_csk(sk); 2449fc518953SFlorian Westphal struct net *net = sock_net(sk); 2450fc518953SFlorian Westphal int ret; 245118b683bfSPaolo Abeni 2452b6c08380SGeliang Tang ret = __mptcp_init_sock(sk); 2453b6c08380SGeliang Tang if (ret) 2454b6c08380SGeliang Tang return ret; 2455b6c08380SGeliang Tang 2456fc518953SFlorian Westphal if (!mptcp_is_enabled(net)) 2457fc518953SFlorian Westphal return -ENOPROTOOPT; 2458fc518953SFlorian Westphal 2459fc518953SFlorian Westphal if (unlikely(!net->mib.mptcp_statistics) && !mptcp_mib_alloc(net)) 2460fc518953SFlorian Westphal return -ENOMEM; 2461fc518953SFlorian Westphal 2462fa68018dSPaolo Abeni ret = __mptcp_socket_create(mptcp_sk(sk)); 2463fa68018dSPaolo Abeni if (ret) 2464fa68018dSPaolo Abeni return ret; 2465fa68018dSPaolo Abeni 246620b5759fSPaolo Abeni /* fetch the ca name; do it outside __mptcp_init_sock(), so that clone will 246720b5759fSPaolo Abeni * propagate the correct value 246820b5759fSPaolo Abeni */ 246920b5759fSPaolo Abeni tcp_assign_congestion_control(sk); 247020b5759fSPaolo Abeni strcpy(mptcp_sk(sk)->ca_name, icsk->icsk_ca_ops->name); 247120b5759fSPaolo Abeni 247220b5759fSPaolo Abeni /* no need to keep a reference to the ops, the name will suffice */ 247320b5759fSPaolo Abeni tcp_cleanup_congestion_control(sk); 247420b5759fSPaolo Abeni icsk->icsk_ca_ops = NULL; 247520b5759fSPaolo Abeni 2476d027236cSPaolo Abeni sk_sockets_allocated_inc(sk); 2477a6b118feSFlorian Westphal sk->sk_rcvbuf = sock_net(sk)->ipv4.sysctl_tcp_rmem[1]; 2478da51aef5SPaolo Abeni sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[1]; 2479d027236cSPaolo Abeni 248018b683bfSPaolo Abeni return 0; 248118b683bfSPaolo Abeni } 248218b683bfSPaolo Abeni 248318b683bfSPaolo Abeni static void __mptcp_clear_xmit(struct sock *sk) 248418b683bfSPaolo Abeni { 248518b683bfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 248618b683bfSPaolo Abeni struct mptcp_data_frag *dtmp, *dfrag; 2487724cfd2eSPaolo Abeni struct sk_buff *skb; 248818b683bfSPaolo Abeni 2489d9ca1de8SPaolo Abeni WRITE_ONCE(msk->first_pending, NULL); 249018b683bfSPaolo Abeni list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) 2491d027236cSPaolo Abeni dfrag_clear(sk, dfrag); 2492724cfd2eSPaolo Abeni while ((skb = __skb_dequeue(&msk->skb_tx_cache)) != NULL) { 2493724cfd2eSPaolo Abeni sk->sk_forward_alloc += skb->truesize; 2494724cfd2eSPaolo Abeni kfree_skb(skb); 2495724cfd2eSPaolo Abeni } 2496784325e9SMatthieu Baerts } 2497784325e9SMatthieu Baerts 249880992017SPaolo Abeni static void mptcp_cancel_work(struct sock *sk) 249980992017SPaolo Abeni { 250080992017SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 250180992017SPaolo Abeni 2502b2771d24SPaolo Abeni if (cancel_work_sync(&msk->work)) 2503e16163b6SPaolo Abeni __sock_put(sk); 250480992017SPaolo Abeni } 250580992017SPaolo Abeni 2506d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how) 250721498490SPeter Krystad { 250821498490SPeter Krystad lock_sock(ssk); 250921498490SPeter Krystad 251021498490SPeter Krystad switch (ssk->sk_state) { 251121498490SPeter Krystad case TCP_LISTEN: 251221498490SPeter Krystad if (!(how & RCV_SHUTDOWN)) 251321498490SPeter Krystad break; 2514df561f66SGustavo A. R. Silva fallthrough; 251521498490SPeter Krystad case TCP_SYN_SENT: 251621498490SPeter Krystad tcp_disconnect(ssk, O_NONBLOCK); 251721498490SPeter Krystad break; 251821498490SPeter Krystad default: 251943b54c6eSMat Martineau if (__mptcp_check_fallback(mptcp_sk(sk))) { 252043b54c6eSMat Martineau pr_debug("Fallback"); 252121498490SPeter Krystad ssk->sk_shutdown |= how; 252221498490SPeter Krystad tcp_shutdown(ssk, how); 252343b54c6eSMat Martineau } else { 252443b54c6eSMat Martineau pr_debug("Sending DATA_FIN on subflow %p", ssk); 252543b54c6eSMat Martineau mptcp_set_timeout(sk, ssk); 252643b54c6eSMat Martineau tcp_send_ack(ssk); 25276477dd39SMat Martineau if (!mptcp_timer_pending(sk)) 25286477dd39SMat Martineau mptcp_reset_timer(sk); 252943b54c6eSMat Martineau } 253021498490SPeter Krystad break; 253121498490SPeter Krystad } 253221498490SPeter Krystad 253321498490SPeter Krystad release_sock(ssk); 253421498490SPeter Krystad } 253521498490SPeter Krystad 25366920b851SMat Martineau static const unsigned char new_state[16] = { 25376920b851SMat Martineau /* current state: new state: action: */ 25386920b851SMat Martineau [0 /* (Invalid) */] = TCP_CLOSE, 25396920b851SMat Martineau [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, 25406920b851SMat Martineau [TCP_SYN_SENT] = TCP_CLOSE, 25416920b851SMat Martineau [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, 25426920b851SMat Martineau [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, 25436920b851SMat Martineau [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, 25446920b851SMat Martineau [TCP_TIME_WAIT] = TCP_CLOSE, /* should not happen ! */ 25456920b851SMat Martineau [TCP_CLOSE] = TCP_CLOSE, 25466920b851SMat Martineau [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, 25476920b851SMat Martineau [TCP_LAST_ACK] = TCP_LAST_ACK, 25486920b851SMat Martineau [TCP_LISTEN] = TCP_CLOSE, 25496920b851SMat Martineau [TCP_CLOSING] = TCP_CLOSING, 25506920b851SMat Martineau [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ 25516920b851SMat Martineau }; 25526920b851SMat Martineau 25536920b851SMat Martineau static int mptcp_close_state(struct sock *sk) 25546920b851SMat Martineau { 25556920b851SMat Martineau int next = (int)new_state[sk->sk_state]; 25566920b851SMat Martineau int ns = next & TCP_STATE_MASK; 25576920b851SMat Martineau 25586920b851SMat Martineau inet_sk_state_store(sk, ns); 25596920b851SMat Martineau 25606920b851SMat Martineau return next & TCP_ACTION_FIN; 25616920b851SMat Martineau } 25626920b851SMat Martineau 2563e16163b6SPaolo Abeni static void __mptcp_check_send_data_fin(struct sock *sk) 2564e16163b6SPaolo Abeni { 2565e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow; 2566e16163b6SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 2567e16163b6SPaolo Abeni 2568e16163b6SPaolo Abeni pr_debug("msk=%p snd_data_fin_enable=%d pending=%d snd_nxt=%llu write_seq=%llu", 2569e16163b6SPaolo Abeni msk, msk->snd_data_fin_enable, !!mptcp_send_head(sk), 2570e16163b6SPaolo Abeni msk->snd_nxt, msk->write_seq); 2571e16163b6SPaolo Abeni 2572e16163b6SPaolo Abeni /* we still need to enqueue subflows or not really shutting down, 2573e16163b6SPaolo Abeni * skip this 2574e16163b6SPaolo Abeni */ 2575e16163b6SPaolo Abeni if (!msk->snd_data_fin_enable || msk->snd_nxt + 1 != msk->write_seq || 2576e16163b6SPaolo Abeni mptcp_send_head(sk)) 2577e16163b6SPaolo Abeni return; 2578e16163b6SPaolo Abeni 2579e16163b6SPaolo Abeni WRITE_ONCE(msk->snd_nxt, msk->write_seq); 2580e16163b6SPaolo Abeni 258126aa2314SPaolo Abeni /* fallback socket will not get data_fin/ack, can move to the next 258226aa2314SPaolo Abeni * state now 258326aa2314SPaolo Abeni */ 258426aa2314SPaolo Abeni if (__mptcp_check_fallback(msk)) { 258526aa2314SPaolo Abeni if ((1 << sk->sk_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) { 2586e16163b6SPaolo Abeni inet_sk_state_store(sk, TCP_CLOSE); 2587e16163b6SPaolo Abeni mptcp_close_wake_up(sk); 258826aa2314SPaolo Abeni } else if (sk->sk_state == TCP_FIN_WAIT1) { 258926aa2314SPaolo Abeni inet_sk_state_store(sk, TCP_FIN_WAIT2); 259026aa2314SPaolo Abeni } 2591e16163b6SPaolo Abeni } 2592e16163b6SPaolo Abeni 259378962489SFlorian Westphal mptcp_flush_join_list(msk); 2594e16163b6SPaolo Abeni mptcp_for_each_subflow(msk, subflow) { 2595e16163b6SPaolo Abeni struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow); 2596e16163b6SPaolo Abeni 2597e16163b6SPaolo Abeni mptcp_subflow_shutdown(sk, tcp_sk, SEND_SHUTDOWN); 2598e16163b6SPaolo Abeni } 2599e16163b6SPaolo Abeni } 2600e16163b6SPaolo Abeni 2601e16163b6SPaolo Abeni static void __mptcp_wr_shutdown(struct sock *sk) 2602e16163b6SPaolo Abeni { 2603e16163b6SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 2604e16163b6SPaolo Abeni 2605e16163b6SPaolo Abeni pr_debug("msk=%p snd_data_fin_enable=%d shutdown=%x state=%d pending=%d", 2606e16163b6SPaolo Abeni msk, msk->snd_data_fin_enable, sk->sk_shutdown, sk->sk_state, 2607e16163b6SPaolo Abeni !!mptcp_send_head(sk)); 2608e16163b6SPaolo Abeni 2609e16163b6SPaolo Abeni /* will be ignored by fallback sockets */ 2610e16163b6SPaolo Abeni WRITE_ONCE(msk->write_seq, msk->write_seq + 1); 2611e16163b6SPaolo Abeni WRITE_ONCE(msk->snd_data_fin_enable, 1); 2612e16163b6SPaolo Abeni 2613e16163b6SPaolo Abeni __mptcp_check_send_data_fin(sk); 2614e16163b6SPaolo Abeni } 2615e16163b6SPaolo Abeni 2616e16163b6SPaolo Abeni static void __mptcp_destroy_sock(struct sock *sk) 2617f870fa0bSMat Martineau { 2618cec37a6eSPeter Krystad struct mptcp_subflow_context *subflow, *tmp; 2619f870fa0bSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk); 2620b2c5b614SFlorian Westphal LIST_HEAD(conn_list); 2621f870fa0bSMat Martineau 2622e16163b6SPaolo Abeni pr_debug("msk=%p", msk); 26232c22c06cSFlorian Westphal 26243abc05d9SFlorian Westphal might_sleep(); 26253abc05d9SFlorian Westphal 262610f6d46cSPaolo Abeni /* be sure to always acquire the join list lock, to sync vs 262710f6d46cSPaolo Abeni * mptcp_finish_join(). 262810f6d46cSPaolo Abeni */ 262910f6d46cSPaolo Abeni spin_lock_bh(&msk->join_list_lock); 263010f6d46cSPaolo Abeni list_splice_tail_init(&msk->join_list, &msk->conn_list); 263110f6d46cSPaolo Abeni spin_unlock_bh(&msk->join_list_lock); 2632b2c5b614SFlorian Westphal list_splice_init(&msk->conn_list, &conn_list); 2633b2c5b614SFlorian Westphal 26346e628cd3SPaolo Abeni sk_stop_timer(sk, &msk->sk.icsk_retransmit_timer); 2635e16163b6SPaolo Abeni sk_stop_timer(sk, &sk->sk_timer); 2636e16163b6SPaolo Abeni msk->pm.status = 0; 2637b2c5b614SFlorian Westphal 2638b2c5b614SFlorian Westphal list_for_each_entry_safe(subflow, tmp, &conn_list, node) { 2639cec37a6eSPeter Krystad struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 2640e16163b6SPaolo Abeni __mptcp_close_ssk(sk, ssk, subflow); 2641f870fa0bSMat Martineau } 2642f870fa0bSMat Martineau 2643e16163b6SPaolo Abeni sk->sk_prot->destroy(sk); 2644e16163b6SPaolo Abeni 2645e93da928SPaolo Abeni WARN_ON_ONCE(msk->wmem_reserved); 264687952603SPaolo Abeni WARN_ON_ONCE(msk->rmem_released); 2647e16163b6SPaolo Abeni sk_stream_kill_queues(sk); 2648e16163b6SPaolo Abeni xfrm_sk_free_policy(sk); 2649aa1fbd94SFlorian Westphal 2650e16163b6SPaolo Abeni sk_refcnt_debug_release(sk); 265117aee05dSFlorian Westphal mptcp_dispose_initial_subflow(msk); 2652e16163b6SPaolo Abeni sock_put(sk); 2653e16163b6SPaolo Abeni } 2654e16163b6SPaolo Abeni 2655e16163b6SPaolo Abeni static void mptcp_close(struct sock *sk, long timeout) 2656e16163b6SPaolo Abeni { 2657e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow; 2658e16163b6SPaolo Abeni bool do_cancel_work = false; 2659e16163b6SPaolo Abeni 2660e16163b6SPaolo Abeni lock_sock(sk); 2661e16163b6SPaolo Abeni sk->sk_shutdown = SHUTDOWN_MASK; 2662e16163b6SPaolo Abeni 2663e16163b6SPaolo Abeni if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) { 2664e16163b6SPaolo Abeni inet_sk_state_store(sk, TCP_CLOSE); 2665e16163b6SPaolo Abeni goto cleanup; 2666e16163b6SPaolo Abeni } 2667e16163b6SPaolo Abeni 2668e16163b6SPaolo Abeni if (mptcp_close_state(sk)) 2669e16163b6SPaolo Abeni __mptcp_wr_shutdown(sk); 2670e16163b6SPaolo Abeni 2671e16163b6SPaolo Abeni sk_stream_wait_close(sk, timeout); 2672e16163b6SPaolo Abeni 2673e16163b6SPaolo Abeni cleanup: 2674e16163b6SPaolo Abeni /* orphan all the subflows */ 2675e16163b6SPaolo Abeni inet_csk(sk)->icsk_mtup.probe_timestamp = tcp_jiffies32; 267644227915SGeliang Tang mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 2677e16163b6SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 2678866f26f2SPaolo Abeni bool slow = lock_sock_fast(ssk); 2679e16163b6SPaolo Abeni 2680e16163b6SPaolo Abeni sock_orphan(ssk); 2681e16163b6SPaolo Abeni unlock_sock_fast(ssk, slow); 2682e16163b6SPaolo Abeni } 2683e16163b6SPaolo Abeni sock_orphan(sk); 2684e16163b6SPaolo Abeni 2685e16163b6SPaolo Abeni sock_hold(sk); 2686e16163b6SPaolo Abeni pr_debug("msk=%p state=%d", sk, sk->sk_state); 2687e16163b6SPaolo Abeni if (sk->sk_state == TCP_CLOSE) { 2688e16163b6SPaolo Abeni __mptcp_destroy_sock(sk); 2689e16163b6SPaolo Abeni do_cancel_work = true; 2690e16163b6SPaolo Abeni } else { 2691e16163b6SPaolo Abeni sk_reset_timer(sk, &sk->sk_timer, jiffies + TCP_TIMEWAIT_LEN); 2692e16163b6SPaolo Abeni } 2693e16163b6SPaolo Abeni release_sock(sk); 2694e16163b6SPaolo Abeni if (do_cancel_work) 269580992017SPaolo Abeni mptcp_cancel_work(sk); 2696b911c97cSFlorian Westphal 2697b911c97cSFlorian Westphal if (mptcp_sk(sk)->token) 2698b911c97cSFlorian Westphal mptcp_event(MPTCP_EVENT_CLOSED, mptcp_sk(sk), NULL, GFP_KERNEL); 2699b911c97cSFlorian Westphal 2700e16163b6SPaolo Abeni sock_put(sk); 2701f870fa0bSMat Martineau } 2702f870fa0bSMat Martineau 2703cf7da0d6SPeter Krystad static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk) 2704cf7da0d6SPeter Krystad { 2705cf7da0d6SPeter Krystad #if IS_ENABLED(CONFIG_MPTCP_IPV6) 2706cf7da0d6SPeter Krystad const struct ipv6_pinfo *ssk6 = inet6_sk(ssk); 2707cf7da0d6SPeter Krystad struct ipv6_pinfo *msk6 = inet6_sk(msk); 2708cf7da0d6SPeter Krystad 2709cf7da0d6SPeter Krystad msk->sk_v6_daddr = ssk->sk_v6_daddr; 2710cf7da0d6SPeter Krystad msk->sk_v6_rcv_saddr = ssk->sk_v6_rcv_saddr; 2711cf7da0d6SPeter Krystad 2712cf7da0d6SPeter Krystad if (msk6 && ssk6) { 2713cf7da0d6SPeter Krystad msk6->saddr = ssk6->saddr; 2714cf7da0d6SPeter Krystad msk6->flow_label = ssk6->flow_label; 2715cf7da0d6SPeter Krystad } 2716cf7da0d6SPeter Krystad #endif 2717cf7da0d6SPeter Krystad 2718cf7da0d6SPeter Krystad inet_sk(msk)->inet_num = inet_sk(ssk)->inet_num; 2719cf7da0d6SPeter Krystad inet_sk(msk)->inet_dport = inet_sk(ssk)->inet_dport; 2720cf7da0d6SPeter Krystad inet_sk(msk)->inet_sport = inet_sk(ssk)->inet_sport; 2721cf7da0d6SPeter Krystad inet_sk(msk)->inet_daddr = inet_sk(ssk)->inet_daddr; 2722cf7da0d6SPeter Krystad inet_sk(msk)->inet_saddr = inet_sk(ssk)->inet_saddr; 2723cf7da0d6SPeter Krystad inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr; 2724cf7da0d6SPeter Krystad } 2725cf7da0d6SPeter Krystad 272618b683bfSPaolo Abeni static int mptcp_disconnect(struct sock *sk, int flags) 272718b683bfSPaolo Abeni { 272876e2a55dSPaolo Abeni struct mptcp_subflow_context *subflow; 272976e2a55dSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 273076e2a55dSPaolo Abeni 273178962489SFlorian Westphal mptcp_do_flush_join_list(msk); 273278962489SFlorian Westphal 273313a9499eSPaolo Abeni mptcp_for_each_subflow(msk, subflow) { 273413a9499eSPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 273513a9499eSPaolo Abeni 273613a9499eSPaolo Abeni lock_sock(ssk); 273713a9499eSPaolo Abeni tcp_disconnect(ssk, flags); 273813a9499eSPaolo Abeni release_sock(ssk); 273913a9499eSPaolo Abeni } 274042c556feSFlorian Westphal return 0; 274118b683bfSPaolo Abeni } 274218b683bfSPaolo Abeni 2743b0519de8SFlorian Westphal #if IS_ENABLED(CONFIG_MPTCP_IPV6) 2744b0519de8SFlorian Westphal static struct ipv6_pinfo *mptcp_inet6_sk(const struct sock *sk) 2745b0519de8SFlorian Westphal { 2746b0519de8SFlorian Westphal unsigned int offset = sizeof(struct mptcp6_sock) - sizeof(struct ipv6_pinfo); 2747b0519de8SFlorian Westphal 2748b0519de8SFlorian Westphal return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 2749b0519de8SFlorian Westphal } 2750b0519de8SFlorian Westphal #endif 2751b0519de8SFlorian Westphal 2752fca5c82cSPaolo Abeni struct sock *mptcp_sk_clone(const struct sock *sk, 2753cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 2754fca5c82cSPaolo Abeni struct request_sock *req) 2755b0519de8SFlorian Westphal { 275658b09919SPaolo Abeni struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req); 2757b0519de8SFlorian Westphal struct sock *nsk = sk_clone_lock(sk, GFP_ATOMIC); 275858b09919SPaolo Abeni struct mptcp_sock *msk; 275958b09919SPaolo Abeni u64 ack_seq; 2760b0519de8SFlorian Westphal 2761b0519de8SFlorian Westphal if (!nsk) 2762b0519de8SFlorian Westphal return NULL; 2763b0519de8SFlorian Westphal 2764b0519de8SFlorian Westphal #if IS_ENABLED(CONFIG_MPTCP_IPV6) 2765b0519de8SFlorian Westphal if (nsk->sk_family == AF_INET6) 2766b0519de8SFlorian Westphal inet_sk(nsk)->pinet6 = mptcp_inet6_sk(nsk); 2767b0519de8SFlorian Westphal #endif 2768b0519de8SFlorian Westphal 276958b09919SPaolo Abeni __mptcp_init_sock(nsk); 277058b09919SPaolo Abeni 277158b09919SPaolo Abeni msk = mptcp_sk(nsk); 277258b09919SPaolo Abeni msk->local_key = subflow_req->local_key; 277358b09919SPaolo Abeni msk->token = subflow_req->token; 277458b09919SPaolo Abeni msk->subflow = NULL; 2775b93df08cSPaolo Abeni WRITE_ONCE(msk->fully_established, false); 277658b09919SPaolo Abeni 277758b09919SPaolo Abeni msk->write_seq = subflow_req->idsn + 1; 2778eaa2ffabSPaolo Abeni msk->snd_nxt = msk->write_seq; 27797439d687SPaolo Abeni msk->snd_una = msk->write_seq; 27807439d687SPaolo Abeni msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd; 2781df00b087SFlorian Westphal msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq; 27826f8a612aSFlorian Westphal 2783cfde141eSPaolo Abeni if (mp_opt->mp_capable) { 278458b09919SPaolo Abeni msk->can_ack = true; 2785cfde141eSPaolo Abeni msk->remote_key = mp_opt->sndr_key; 278658b09919SPaolo Abeni mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq); 278758b09919SPaolo Abeni ack_seq++; 2788917944daSMat Martineau WRITE_ONCE(msk->ack_seq, ack_seq); 2789fa3fe2b1SFlorian Westphal WRITE_ONCE(msk->rcv_wnd_sent, ack_seq); 279058b09919SPaolo Abeni } 27917f20d5fcSPaolo Abeni 27925e20087dSFlorian Westphal sock_reset_flag(nsk, SOCK_RCU_FREE); 27937f20d5fcSPaolo Abeni /* will be fully established after successful MPC subflow creation */ 27947f20d5fcSPaolo Abeni inet_sk_state_store(nsk, TCP_SYN_RECV); 27950c148460SPaolo Abeni 27960c148460SPaolo Abeni security_inet_csk_clone(nsk, req); 279758b09919SPaolo Abeni bh_unlock_sock(nsk); 279858b09919SPaolo Abeni 279958b09919SPaolo Abeni /* keep a single reference */ 280058b09919SPaolo Abeni __sock_put(nsk); 2801b0519de8SFlorian Westphal return nsk; 2802b0519de8SFlorian Westphal } 2803b0519de8SFlorian Westphal 2804a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk) 2805a6b118feSFlorian Westphal { 2806a6b118feSFlorian Westphal const struct tcp_sock *tp = tcp_sk(ssk); 2807a6b118feSFlorian Westphal 2808a6b118feSFlorian Westphal msk->rcvq_space.copied = 0; 2809a6b118feSFlorian Westphal msk->rcvq_space.rtt_us = 0; 2810a6b118feSFlorian Westphal 2811a6b118feSFlorian Westphal msk->rcvq_space.time = tp->tcp_mstamp; 2812a6b118feSFlorian Westphal 2813a6b118feSFlorian Westphal /* initial rcv_space offering made to peer */ 2814a6b118feSFlorian Westphal msk->rcvq_space.space = min_t(u32, tp->rcv_wnd, 2815a6b118feSFlorian Westphal TCP_INIT_CWND * tp->advmss); 2816a6b118feSFlorian Westphal if (msk->rcvq_space.space == 0) 2817a6b118feSFlorian Westphal msk->rcvq_space.space = TCP_INIT_CWND * TCP_MSS_DEFAULT; 28186f8a612aSFlorian Westphal 28197439d687SPaolo Abeni WRITE_ONCE(msk->wnd_end, msk->snd_nxt + tcp_sk(ssk)->snd_wnd); 2820a6b118feSFlorian Westphal } 2821a6b118feSFlorian Westphal 2822cf7da0d6SPeter Krystad static struct sock *mptcp_accept(struct sock *sk, int flags, int *err, 2823cf7da0d6SPeter Krystad bool kern) 2824cf7da0d6SPeter Krystad { 2825cf7da0d6SPeter Krystad struct mptcp_sock *msk = mptcp_sk(sk); 2826cf7da0d6SPeter Krystad struct socket *listener; 2827cf7da0d6SPeter Krystad struct sock *newsk; 2828cf7da0d6SPeter Krystad 2829cf7da0d6SPeter Krystad listener = __mptcp_nmpc_socket(msk); 2830cf7da0d6SPeter Krystad if (WARN_ON_ONCE(!listener)) { 2831cf7da0d6SPeter Krystad *err = -EINVAL; 2832cf7da0d6SPeter Krystad return NULL; 2833cf7da0d6SPeter Krystad } 2834cf7da0d6SPeter Krystad 2835cf7da0d6SPeter Krystad pr_debug("msk=%p, listener=%p", msk, mptcp_subflow_ctx(listener->sk)); 2836cf7da0d6SPeter Krystad newsk = inet_csk_accept(listener->sk, flags, err, kern); 2837cf7da0d6SPeter Krystad if (!newsk) 2838cf7da0d6SPeter Krystad return NULL; 2839cf7da0d6SPeter Krystad 2840cf7da0d6SPeter Krystad pr_debug("msk=%p, subflow is mptcp=%d", msk, sk_is_mptcp(newsk)); 2841cf7da0d6SPeter Krystad if (sk_is_mptcp(newsk)) { 2842cf7da0d6SPeter Krystad struct mptcp_subflow_context *subflow; 2843cf7da0d6SPeter Krystad struct sock *new_mptcp_sock; 2844cf7da0d6SPeter Krystad 2845cf7da0d6SPeter Krystad subflow = mptcp_subflow_ctx(newsk); 284658b09919SPaolo Abeni new_mptcp_sock = subflow->conn; 284758b09919SPaolo Abeni 284858b09919SPaolo Abeni /* is_mptcp should be false if subflow->conn is missing, see 284958b09919SPaolo Abeni * subflow_syn_recv_sock() 285058b09919SPaolo Abeni */ 285158b09919SPaolo Abeni if (WARN_ON_ONCE(!new_mptcp_sock)) { 285258b09919SPaolo Abeni tcp_sk(newsk)->is_mptcp = 0; 285358b09919SPaolo Abeni return newsk; 285458b09919SPaolo Abeni } 285558b09919SPaolo Abeni 285658b09919SPaolo Abeni /* acquire the 2nd reference for the owning socket */ 285758b09919SPaolo Abeni sock_hold(new_mptcp_sock); 2858cf7da0d6SPeter Krystad newsk = new_mptcp_sock; 28590397c6d8SPaolo Abeni MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEACK); 2860fc518953SFlorian Westphal } else { 2861fc518953SFlorian Westphal MPTCP_INC_STATS(sock_net(sk), 2862fc518953SFlorian Westphal MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK); 2863cf7da0d6SPeter Krystad } 2864cf7da0d6SPeter Krystad 2865cf7da0d6SPeter Krystad return newsk; 2866cf7da0d6SPeter Krystad } 2867cf7da0d6SPeter Krystad 28685c8c1640SGeliang Tang void mptcp_destroy_common(struct mptcp_sock *msk) 28695c8c1640SGeliang Tang { 287087952603SPaolo Abeni struct sock *sk = (struct sock *)msk; 287187952603SPaolo Abeni 28726e628cd3SPaolo Abeni __mptcp_clear_xmit(sk); 28736e628cd3SPaolo Abeni 287487952603SPaolo Abeni /* move to sk_receive_queue, sk_stream_kill_queues will purge it */ 287587952603SPaolo Abeni skb_queue_splice_tail_init(&msk->receive_queue, &sk->sk_receive_queue); 287687952603SPaolo Abeni 28775c8c1640SGeliang Tang skb_rbtree_purge(&msk->out_of_order_queue); 28785c8c1640SGeliang Tang mptcp_token_destroy(msk); 28795c8c1640SGeliang Tang mptcp_pm_free_anno_list(msk); 28805c8c1640SGeliang Tang } 28815c8c1640SGeliang Tang 288279c0949eSPeter Krystad static void mptcp_destroy(struct sock *sk) 288379c0949eSPeter Krystad { 2884c9fd9c5fSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 2885c9fd9c5fSFlorian Westphal 28865c8c1640SGeliang Tang mptcp_destroy_common(msk); 2887d027236cSPaolo Abeni sk_sockets_allocated_dec(sk); 288879c0949eSPeter Krystad } 288979c0949eSPeter Krystad 28906e628cd3SPaolo Abeni void __mptcp_data_acked(struct sock *sk) 28916e628cd3SPaolo Abeni { 28926e628cd3SPaolo Abeni if (!sock_owned_by_user(sk)) 28936e628cd3SPaolo Abeni __mptcp_clean_una(sk); 28946e628cd3SPaolo Abeni else 28956e628cd3SPaolo Abeni set_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->flags); 28966e628cd3SPaolo Abeni 28976e628cd3SPaolo Abeni if (mptcp_pending_data_fin_ack(sk)) 28986e628cd3SPaolo Abeni mptcp_schedule_work(sk); 28996e628cd3SPaolo Abeni } 29006e628cd3SPaolo Abeni 2901219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk) 29026e628cd3SPaolo Abeni { 29036e628cd3SPaolo Abeni if (!mptcp_send_head(sk)) 29046e628cd3SPaolo Abeni return; 29056e628cd3SPaolo Abeni 290640dc9416SPaolo Abeni if (!sock_owned_by_user(sk)) { 2907b19bc294SPaolo Abeni struct sock *xmit_ssk = mptcp_subflow_get_send(mptcp_sk(sk)); 2908b19bc294SPaolo Abeni 2909b19bc294SPaolo Abeni if (xmit_ssk == ssk) 29106e628cd3SPaolo Abeni __mptcp_subflow_push_pending(sk, ssk); 2911b19bc294SPaolo Abeni else if (xmit_ssk) 2912b19bc294SPaolo Abeni mptcp_subflow_delegate(mptcp_subflow_ctx(xmit_ssk)); 291340dc9416SPaolo Abeni } else { 29146e628cd3SPaolo Abeni set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags); 29156e628cd3SPaolo Abeni } 291640dc9416SPaolo Abeni } 29176e628cd3SPaolo Abeni 2918e93da928SPaolo Abeni /* processes deferred events and flush wmem */ 291914c441b5SPaolo Abeni static void mptcp_release_cb(struct sock *sk) 292014c441b5SPaolo Abeni { 2921c2e6048fSPaolo Abeni for (;;) { 29222d6f5a2bSPaolo Abeni unsigned long flags = 0; 29232d6f5a2bSPaolo Abeni 2924c2e6048fSPaolo Abeni if (test_and_clear_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags)) 29252e5de7e0SDan Carpenter flags |= BIT(MPTCP_PUSH_PENDING); 29262d6f5a2bSPaolo Abeni if (test_and_clear_bit(MPTCP_RETRANSMIT, &mptcp_sk(sk)->flags)) 29272d6f5a2bSPaolo Abeni flags |= BIT(MPTCP_RETRANSMIT); 2928c2e6048fSPaolo Abeni if (!flags) 2929c2e6048fSPaolo Abeni break; 2930c2e6048fSPaolo Abeni 2931c2e6048fSPaolo Abeni /* the following actions acquire the subflow socket lock 29326e628cd3SPaolo Abeni * 29336e628cd3SPaolo Abeni * 1) can't be invoked in atomic scope 29346e628cd3SPaolo Abeni * 2) must avoid ABBA deadlock with msk socket spinlock: the RX 29356e628cd3SPaolo Abeni * datapath acquires the msk socket spinlock while helding 29366e628cd3SPaolo Abeni * the subflow socket lock 29376e628cd3SPaolo Abeni */ 29386e628cd3SPaolo Abeni 29396e628cd3SPaolo Abeni spin_unlock_bh(&sk->sk_lock.slock); 29402e5de7e0SDan Carpenter if (flags & BIT(MPTCP_PUSH_PENDING)) 2941c2e6048fSPaolo Abeni __mptcp_push_pending(sk, 0); 29422d6f5a2bSPaolo Abeni if (flags & BIT(MPTCP_RETRANSMIT)) 29432d6f5a2bSPaolo Abeni __mptcp_retrans(sk); 2944c2e6048fSPaolo Abeni 2945c2e6048fSPaolo Abeni cond_resched(); 29466e628cd3SPaolo Abeni spin_lock_bh(&sk->sk_lock.slock); 29476e628cd3SPaolo Abeni } 2948c2e6048fSPaolo Abeni 2949c2e6048fSPaolo Abeni if (test_and_clear_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->flags)) 2950417789dfSPaolo Abeni __mptcp_clean_una_wakeup(sk); 295115cc1045SPaolo Abeni if (test_and_clear_bit(MPTCP_ERROR_REPORT, &mptcp_sk(sk)->flags)) 295215cc1045SPaolo Abeni __mptcp_error_report(sk); 29536e628cd3SPaolo Abeni 2954c2e6048fSPaolo Abeni /* push_pending may touch wmem_reserved, ensure we do the cleanup 2955c2e6048fSPaolo Abeni * later 2956c2e6048fSPaolo Abeni */ 2957e93da928SPaolo Abeni __mptcp_update_wmem(sk); 295887952603SPaolo Abeni __mptcp_update_rmem(sk); 295914c441b5SPaolo Abeni } 296014c441b5SPaolo Abeni 2961b19bc294SPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk) 2962b19bc294SPaolo Abeni { 2963b19bc294SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 2964b19bc294SPaolo Abeni struct sock *sk = subflow->conn; 2965b19bc294SPaolo Abeni 2966b19bc294SPaolo Abeni mptcp_data_lock(sk); 2967b19bc294SPaolo Abeni if (!sock_owned_by_user(sk)) 2968b19bc294SPaolo Abeni __mptcp_subflow_push_pending(sk, ssk); 2969b19bc294SPaolo Abeni else 2970b19bc294SPaolo Abeni set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags); 2971b19bc294SPaolo Abeni mptcp_data_unlock(sk); 2972b19bc294SPaolo Abeni mptcp_subflow_delegated_done(subflow); 2973b19bc294SPaolo Abeni } 2974b19bc294SPaolo Abeni 29752c5ebd00SPaolo Abeni static int mptcp_hash(struct sock *sk) 29762c5ebd00SPaolo Abeni { 29772c5ebd00SPaolo Abeni /* should never be called, 29782c5ebd00SPaolo Abeni * we hash the TCP subflows not the master socket 29792c5ebd00SPaolo Abeni */ 29802c5ebd00SPaolo Abeni WARN_ON_ONCE(1); 29812c5ebd00SPaolo Abeni return 0; 29822c5ebd00SPaolo Abeni } 29832c5ebd00SPaolo Abeni 29842c5ebd00SPaolo Abeni static void mptcp_unhash(struct sock *sk) 29852c5ebd00SPaolo Abeni { 29862c5ebd00SPaolo Abeni /* called from sk_common_release(), but nothing to do here */ 29872c5ebd00SPaolo Abeni } 29882c5ebd00SPaolo Abeni 2989cec37a6eSPeter Krystad static int mptcp_get_port(struct sock *sk, unsigned short snum) 2990f870fa0bSMat Martineau { 2991f870fa0bSMat Martineau struct mptcp_sock *msk = mptcp_sk(sk); 2992cec37a6eSPeter Krystad struct socket *ssock; 2993f870fa0bSMat Martineau 2994cec37a6eSPeter Krystad ssock = __mptcp_nmpc_socket(msk); 2995cec37a6eSPeter Krystad pr_debug("msk=%p, subflow=%p", msk, ssock); 2996cec37a6eSPeter Krystad if (WARN_ON_ONCE(!ssock)) 2997cec37a6eSPeter Krystad return -EINVAL; 2998f870fa0bSMat Martineau 2999cec37a6eSPeter Krystad return inet_csk_get_port(ssock->sk, snum); 3000cec37a6eSPeter Krystad } 3001f870fa0bSMat Martineau 3002cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *ssk) 3003cec37a6eSPeter Krystad { 3004cec37a6eSPeter Krystad struct mptcp_subflow_context *subflow; 3005cec37a6eSPeter Krystad struct mptcp_sock *msk; 3006cec37a6eSPeter Krystad struct sock *sk; 30076d0060f6SMat Martineau u64 ack_seq; 3008f870fa0bSMat Martineau 3009cec37a6eSPeter Krystad subflow = mptcp_subflow_ctx(ssk); 3010cec37a6eSPeter Krystad sk = subflow->conn; 3011cec37a6eSPeter Krystad msk = mptcp_sk(sk); 3012cec37a6eSPeter Krystad 3013648ef4b8SMat Martineau pr_debug("msk=%p, token=%u", sk, subflow->token); 3014648ef4b8SMat Martineau 30156d0060f6SMat Martineau mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq); 30166d0060f6SMat Martineau ack_seq++; 3017648ef4b8SMat Martineau subflow->map_seq = ack_seq; 3018648ef4b8SMat Martineau subflow->map_subflow_seq = 1; 30196d0060f6SMat Martineau 3020cec37a6eSPeter Krystad /* the socket is not connected yet, no msk/subflow ops can access/race 3021cec37a6eSPeter Krystad * accessing the field below 3022cec37a6eSPeter Krystad */ 3023cec37a6eSPeter Krystad WRITE_ONCE(msk->remote_key, subflow->remote_key); 3024cec37a6eSPeter Krystad WRITE_ONCE(msk->local_key, subflow->local_key); 30256d0060f6SMat Martineau WRITE_ONCE(msk->write_seq, subflow->idsn + 1); 3026eaa2ffabSPaolo Abeni WRITE_ONCE(msk->snd_nxt, msk->write_seq); 30276d0060f6SMat Martineau WRITE_ONCE(msk->ack_seq, ack_seq); 3028fa3fe2b1SFlorian Westphal WRITE_ONCE(msk->rcv_wnd_sent, ack_seq); 3029d22f4988SChristoph Paasch WRITE_ONCE(msk->can_ack, 1); 30307439d687SPaolo Abeni WRITE_ONCE(msk->snd_una, msk->write_seq); 30311b1c7a0eSPeter Krystad 30326c714f1bSFlorian Westphal mptcp_pm_new_connection(msk, ssk, 0); 3033a6b118feSFlorian Westphal 3034a6b118feSFlorian Westphal mptcp_rcv_space_init(msk, ssk); 3035f870fa0bSMat Martineau } 3036f870fa0bSMat Martineau 3037866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent) 3038cf7da0d6SPeter Krystad { 3039cf7da0d6SPeter Krystad write_lock_bh(&sk->sk_callback_lock); 3040cf7da0d6SPeter Krystad rcu_assign_pointer(sk->sk_wq, &parent->wq); 3041cf7da0d6SPeter Krystad sk_set_socket(sk, parent); 3042cf7da0d6SPeter Krystad sk->sk_uid = SOCK_INODE(parent)->i_uid; 3043cf7da0d6SPeter Krystad write_unlock_bh(&sk->sk_callback_lock); 3044cf7da0d6SPeter Krystad } 3045cf7da0d6SPeter Krystad 3046e16163b6SPaolo Abeni bool mptcp_finish_join(struct sock *ssk) 3047f296234cSPeter Krystad { 3048e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 3049f296234cSPeter Krystad struct mptcp_sock *msk = mptcp_sk(subflow->conn); 3050f296234cSPeter Krystad struct sock *parent = (void *)msk; 3051f296234cSPeter Krystad struct socket *parent_sock; 3052ec3edaa7SPeter Krystad bool ret; 3053f296234cSPeter Krystad 3054f296234cSPeter Krystad pr_debug("msk=%p, subflow=%p", msk, subflow); 3055f296234cSPeter Krystad 3056f296234cSPeter Krystad /* mptcp socket already closing? */ 3057dc87efdbSFlorian Westphal if (!mptcp_is_fully_established(parent)) { 3058dc87efdbSFlorian Westphal subflow->reset_reason = MPTCP_RST_EMPTCP; 3059f296234cSPeter Krystad return false; 3060dc87efdbSFlorian Westphal } 3061f296234cSPeter Krystad 3062f296234cSPeter Krystad if (!msk->pm.server_side) 3063b911c97cSFlorian Westphal goto out; 3064f296234cSPeter Krystad 3065dc87efdbSFlorian Westphal if (!mptcp_pm_allow_new_subflow(msk)) { 3066dc87efdbSFlorian Westphal subflow->reset_reason = MPTCP_RST_EPROHIBIT; 306710f6d46cSPaolo Abeni return false; 3068dc87efdbSFlorian Westphal } 306910f6d46cSPaolo Abeni 307010f6d46cSPaolo Abeni /* active connections are already on conn_list, and we can't acquire 307110f6d46cSPaolo Abeni * msk lock here. 307210f6d46cSPaolo Abeni * use the join list lock as synchronization point and double-check 3073e16163b6SPaolo Abeni * msk status to avoid racing with __mptcp_destroy_sock() 307410f6d46cSPaolo Abeni */ 307510f6d46cSPaolo Abeni spin_lock_bh(&msk->join_list_lock); 307610f6d46cSPaolo Abeni ret = inet_sk_state_load(parent) == TCP_ESTABLISHED; 3077e16163b6SPaolo Abeni if (ret && !WARN_ON_ONCE(!list_empty(&subflow->node))) { 307810f6d46cSPaolo Abeni list_add_tail(&subflow->node, &msk->join_list); 3079e16163b6SPaolo Abeni sock_hold(ssk); 3080e16163b6SPaolo Abeni } 308110f6d46cSPaolo Abeni spin_unlock_bh(&msk->join_list_lock); 3082dc87efdbSFlorian Westphal if (!ret) { 3083dc87efdbSFlorian Westphal subflow->reset_reason = MPTCP_RST_EPROHIBIT; 308410f6d46cSPaolo Abeni return false; 3085dc87efdbSFlorian Westphal } 308610f6d46cSPaolo Abeni 308710f6d46cSPaolo Abeni /* attach to msk socket only after we are sure he will deal with us 308810f6d46cSPaolo Abeni * at close time 308910f6d46cSPaolo Abeni */ 3090f296234cSPeter Krystad parent_sock = READ_ONCE(parent->sk_socket); 3091e16163b6SPaolo Abeni if (parent_sock && !ssk->sk_socket) 3092e16163b6SPaolo Abeni mptcp_sock_graft(ssk, parent_sock); 3093917944daSMat Martineau subflow->map_seq = READ_ONCE(msk->ack_seq); 3094b911c97cSFlorian Westphal out: 3095b911c97cSFlorian Westphal mptcp_event(MPTCP_EVENT_SUB_ESTABLISHED, msk, ssk, GFP_ATOMIC); 309610f6d46cSPaolo Abeni return true; 3097f296234cSPeter Krystad } 3098f296234cSPeter Krystad 309976e2a55dSPaolo Abeni static void mptcp_shutdown(struct sock *sk, int how) 310076e2a55dSPaolo Abeni { 310176e2a55dSPaolo Abeni pr_debug("sk=%p, how=%d", sk, how); 310276e2a55dSPaolo Abeni 310376e2a55dSPaolo Abeni if ((how & SEND_SHUTDOWN) && mptcp_close_state(sk)) 310476e2a55dSPaolo Abeni __mptcp_wr_shutdown(sk); 310576e2a55dSPaolo Abeni } 310676e2a55dSPaolo Abeni 3107f870fa0bSMat Martineau static struct proto mptcp_prot = { 3108f870fa0bSMat Martineau .name = "MPTCP", 3109f870fa0bSMat Martineau .owner = THIS_MODULE, 3110f870fa0bSMat Martineau .init = mptcp_init_sock, 311118b683bfSPaolo Abeni .disconnect = mptcp_disconnect, 3112f870fa0bSMat Martineau .close = mptcp_close, 3113cf7da0d6SPeter Krystad .accept = mptcp_accept, 3114717e79c8SPeter Krystad .setsockopt = mptcp_setsockopt, 3115717e79c8SPeter Krystad .getsockopt = mptcp_getsockopt, 311676e2a55dSPaolo Abeni .shutdown = mptcp_shutdown, 311779c0949eSPeter Krystad .destroy = mptcp_destroy, 3118f870fa0bSMat Martineau .sendmsg = mptcp_sendmsg, 3119f870fa0bSMat Martineau .recvmsg = mptcp_recvmsg, 312014c441b5SPaolo Abeni .release_cb = mptcp_release_cb, 31212c5ebd00SPaolo Abeni .hash = mptcp_hash, 31222c5ebd00SPaolo Abeni .unhash = mptcp_unhash, 3123cec37a6eSPeter Krystad .get_port = mptcp_get_port, 3124d027236cSPaolo Abeni .sockets_allocated = &mptcp_sockets_allocated, 3125d027236cSPaolo Abeni .memory_allocated = &tcp_memory_allocated, 3126d027236cSPaolo Abeni .memory_pressure = &tcp_memory_pressure, 3127d027236cSPaolo Abeni .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), 3128989ef49bSPaolo Abeni .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), 3129d027236cSPaolo Abeni .sysctl_mem = sysctl_tcp_mem, 3130f870fa0bSMat Martineau .obj_size = sizeof(struct mptcp_sock), 31312c5ebd00SPaolo Abeni .slab_flags = SLAB_TYPESAFE_BY_RCU, 3132f870fa0bSMat Martineau .no_autobind = true, 3133f870fa0bSMat Martineau }; 3134f870fa0bSMat Martineau 31352303f994SPeter Krystad static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 31362303f994SPeter Krystad { 31372303f994SPeter Krystad struct mptcp_sock *msk = mptcp_sk(sock->sk); 31382303f994SPeter Krystad struct socket *ssock; 3139cf7da0d6SPeter Krystad int err; 31402303f994SPeter Krystad 31412303f994SPeter Krystad lock_sock(sock->sk); 3142fa68018dSPaolo Abeni ssock = __mptcp_nmpc_socket(msk); 3143fa68018dSPaolo Abeni if (!ssock) { 3144fa68018dSPaolo Abeni err = -EINVAL; 31452303f994SPeter Krystad goto unlock; 31462303f994SPeter Krystad } 31472303f994SPeter Krystad 31482303f994SPeter Krystad err = ssock->ops->bind(ssock, uaddr, addr_len); 3149cf7da0d6SPeter Krystad if (!err) 3150cf7da0d6SPeter Krystad mptcp_copy_inaddrs(sock->sk, ssock->sk); 31512303f994SPeter Krystad 31522303f994SPeter Krystad unlock: 31532303f994SPeter Krystad release_sock(sock->sk); 31542303f994SPeter Krystad return err; 31552303f994SPeter Krystad } 31562303f994SPeter Krystad 31570235d075SPaolo Abeni static void mptcp_subflow_early_fallback(struct mptcp_sock *msk, 31580235d075SPaolo Abeni struct mptcp_subflow_context *subflow) 31590235d075SPaolo Abeni { 31600235d075SPaolo Abeni subflow->request_mptcp = 0; 31610235d075SPaolo Abeni __mptcp_do_fallback(msk); 31620235d075SPaolo Abeni } 31630235d075SPaolo Abeni 31642303f994SPeter Krystad static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr, 31652303f994SPeter Krystad int addr_len, int flags) 31662303f994SPeter Krystad { 31672303f994SPeter Krystad struct mptcp_sock *msk = mptcp_sk(sock->sk); 31682c5ebd00SPaolo Abeni struct mptcp_subflow_context *subflow; 31692303f994SPeter Krystad struct socket *ssock; 31702303f994SPeter Krystad int err; 31712303f994SPeter Krystad 31722303f994SPeter Krystad lock_sock(sock->sk); 317341be81a8SPaolo Abeni if (sock->state != SS_UNCONNECTED && msk->subflow) { 317441be81a8SPaolo Abeni /* pending connection or invalid state, let existing subflow 317541be81a8SPaolo Abeni * cope with that 317641be81a8SPaolo Abeni */ 317741be81a8SPaolo Abeni ssock = msk->subflow; 317841be81a8SPaolo Abeni goto do_connect; 317941be81a8SPaolo Abeni } 318041be81a8SPaolo Abeni 3181fa68018dSPaolo Abeni ssock = __mptcp_nmpc_socket(msk); 3182fa68018dSPaolo Abeni if (!ssock) { 3183fa68018dSPaolo Abeni err = -EINVAL; 31842303f994SPeter Krystad goto unlock; 31852303f994SPeter Krystad } 31862303f994SPeter Krystad 3187fa68018dSPaolo Abeni mptcp_token_destroy(msk); 3188fa68018dSPaolo Abeni inet_sk_state_store(sock->sk, TCP_SYN_SENT); 31892c5ebd00SPaolo Abeni subflow = mptcp_subflow_ctx(ssock->sk); 3190cf7da0d6SPeter Krystad #ifdef CONFIG_TCP_MD5SIG 3191cf7da0d6SPeter Krystad /* no MPTCP if MD5SIG is enabled on this socket or we may run out of 3192cf7da0d6SPeter Krystad * TCP option space. 3193cf7da0d6SPeter Krystad */ 3194cf7da0d6SPeter Krystad if (rcu_access_pointer(tcp_sk(ssock->sk)->md5sig_info)) 31950235d075SPaolo Abeni mptcp_subflow_early_fallback(msk, subflow); 3196cf7da0d6SPeter Krystad #endif 3197a16195e3SPaolo Abeni if (subflow->request_mptcp && mptcp_token_new_connect(ssock->sk)) { 3198a16195e3SPaolo Abeni MPTCP_INC_STATS(sock_net(ssock->sk), MPTCP_MIB_TOKENFALLBACKINIT); 31990235d075SPaolo Abeni mptcp_subflow_early_fallback(msk, subflow); 3200a16195e3SPaolo Abeni } 32015695eb88SPaolo Abeni if (likely(!__mptcp_check_fallback(msk))) 32025695eb88SPaolo Abeni MPTCP_INC_STATS(sock_net(sock->sk), MPTCP_MIB_MPCAPABLEACTIVE); 3203cf7da0d6SPeter Krystad 320441be81a8SPaolo Abeni do_connect: 32052303f994SPeter Krystad err = ssock->ops->connect(ssock, uaddr, addr_len, flags); 320641be81a8SPaolo Abeni sock->state = ssock->state; 320741be81a8SPaolo Abeni 320841be81a8SPaolo Abeni /* on successful connect, the msk state will be moved to established by 320941be81a8SPaolo Abeni * subflow_finish_connect() 321041be81a8SPaolo Abeni */ 3211367fe04eSMatthieu Baerts if (!err || err == -EINPROGRESS) 3212cf7da0d6SPeter Krystad mptcp_copy_inaddrs(sock->sk, ssock->sk); 321341be81a8SPaolo Abeni else 321441be81a8SPaolo Abeni inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); 32152303f994SPeter Krystad 32162303f994SPeter Krystad unlock: 32172303f994SPeter Krystad release_sock(sock->sk); 32182303f994SPeter Krystad return err; 32192303f994SPeter Krystad } 32202303f994SPeter Krystad 3221cf7da0d6SPeter Krystad static int mptcp_listen(struct socket *sock, int backlog) 3222cf7da0d6SPeter Krystad { 3223cf7da0d6SPeter Krystad struct mptcp_sock *msk = mptcp_sk(sock->sk); 3224cf7da0d6SPeter Krystad struct socket *ssock; 3225cf7da0d6SPeter Krystad int err; 3226cf7da0d6SPeter Krystad 3227cf7da0d6SPeter Krystad pr_debug("msk=%p", msk); 3228cf7da0d6SPeter Krystad 3229cf7da0d6SPeter Krystad lock_sock(sock->sk); 3230fa68018dSPaolo Abeni ssock = __mptcp_nmpc_socket(msk); 3231fa68018dSPaolo Abeni if (!ssock) { 3232fa68018dSPaolo Abeni err = -EINVAL; 3233cf7da0d6SPeter Krystad goto unlock; 3234cf7da0d6SPeter Krystad } 3235cf7da0d6SPeter Krystad 3236fa68018dSPaolo Abeni mptcp_token_destroy(msk); 3237fa68018dSPaolo Abeni inet_sk_state_store(sock->sk, TCP_LISTEN); 32385e20087dSFlorian Westphal sock_set_flag(sock->sk, SOCK_RCU_FREE); 32395e20087dSFlorian Westphal 3240cf7da0d6SPeter Krystad err = ssock->ops->listen(ssock, backlog); 3241cf7da0d6SPeter Krystad inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk)); 3242cf7da0d6SPeter Krystad if (!err) 3243cf7da0d6SPeter Krystad mptcp_copy_inaddrs(sock->sk, ssock->sk); 3244cf7da0d6SPeter Krystad 3245cf7da0d6SPeter Krystad unlock: 3246cf7da0d6SPeter Krystad release_sock(sock->sk); 3247cf7da0d6SPeter Krystad return err; 3248cf7da0d6SPeter Krystad } 3249cf7da0d6SPeter Krystad 3250cf7da0d6SPeter Krystad static int mptcp_stream_accept(struct socket *sock, struct socket *newsock, 3251cf7da0d6SPeter Krystad int flags, bool kern) 3252cf7da0d6SPeter Krystad { 3253cf7da0d6SPeter Krystad struct mptcp_sock *msk = mptcp_sk(sock->sk); 3254cf7da0d6SPeter Krystad struct socket *ssock; 3255cf7da0d6SPeter Krystad int err; 3256cf7da0d6SPeter Krystad 3257cf7da0d6SPeter Krystad pr_debug("msk=%p", msk); 3258cf7da0d6SPeter Krystad 3259cf7da0d6SPeter Krystad lock_sock(sock->sk); 3260cf7da0d6SPeter Krystad if (sock->sk->sk_state != TCP_LISTEN) 3261cf7da0d6SPeter Krystad goto unlock_fail; 3262cf7da0d6SPeter Krystad 3263cf7da0d6SPeter Krystad ssock = __mptcp_nmpc_socket(msk); 3264cf7da0d6SPeter Krystad if (!ssock) 3265cf7da0d6SPeter Krystad goto unlock_fail; 3266cf7da0d6SPeter Krystad 32678a05661bSPaolo Abeni clear_bit(MPTCP_DATA_READY, &msk->flags); 3268cf7da0d6SPeter Krystad sock_hold(ssock->sk); 3269cf7da0d6SPeter Krystad release_sock(sock->sk); 3270cf7da0d6SPeter Krystad 3271cf7da0d6SPeter Krystad err = ssock->ops->accept(sock, newsock, flags, kern); 3272d2f77c53SPaolo Abeni if (err == 0 && !mptcp_is_tcpsk(newsock->sk)) { 3273cf7da0d6SPeter Krystad struct mptcp_sock *msk = mptcp_sk(newsock->sk); 3274cf7da0d6SPeter Krystad struct mptcp_subflow_context *subflow; 32750397c6d8SPaolo Abeni struct sock *newsk = newsock->sk; 32760397c6d8SPaolo Abeni 32774d54cc32SFlorian Westphal lock_sock(newsk); 32785b950ff4SPaolo Abeni 32795b950ff4SPaolo Abeni /* PM/worker can now acquire the first subflow socket 32805b950ff4SPaolo Abeni * lock without racing with listener queue cleanup, 32815b950ff4SPaolo Abeni * we can notify it, if needed. 3282c8fe62f0SFlorian Westphal * 3283c8fe62f0SFlorian Westphal * Even if remote has reset the initial subflow by now 3284c8fe62f0SFlorian Westphal * the refcnt is still at least one. 32855b950ff4SPaolo Abeni */ 32865b950ff4SPaolo Abeni subflow = mptcp_subflow_ctx(msk->first); 32875b950ff4SPaolo Abeni list_add(&subflow->node, &msk->conn_list); 32885b950ff4SPaolo Abeni sock_hold(msk->first); 32895b950ff4SPaolo Abeni if (mptcp_is_fully_established(newsk)) 32906c714f1bSFlorian Westphal mptcp_pm_fully_established(msk, msk->first, GFP_KERNEL); 32915b950ff4SPaolo Abeni 32920397c6d8SPaolo Abeni mptcp_copy_inaddrs(newsk, msk->first); 32930397c6d8SPaolo Abeni mptcp_rcv_space_init(msk, msk->first); 32945cf92bbaSPaolo Abeni mptcp_propagate_sndbuf(newsk, msk->first); 3295cf7da0d6SPeter Krystad 3296cf7da0d6SPeter Krystad /* set ssk->sk_socket of accept()ed flows to mptcp socket. 3297cf7da0d6SPeter Krystad * This is needed so NOSPACE flag can be set from tcp stack. 3298cf7da0d6SPeter Krystad */ 329978962489SFlorian Westphal mptcp_flush_join_list(msk); 3300190f8b06SGeliang Tang mptcp_for_each_subflow(msk, subflow) { 3301cf7da0d6SPeter Krystad struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 3302cf7da0d6SPeter Krystad 3303cf7da0d6SPeter Krystad if (!ssk->sk_socket) 3304cf7da0d6SPeter Krystad mptcp_sock_graft(ssk, newsock); 3305cf7da0d6SPeter Krystad } 33064d54cc32SFlorian Westphal release_sock(newsk); 3307cf7da0d6SPeter Krystad } 3308cf7da0d6SPeter Krystad 33098a05661bSPaolo Abeni if (inet_csk_listen_poll(ssock->sk)) 33108a05661bSPaolo Abeni set_bit(MPTCP_DATA_READY, &msk->flags); 3311cf7da0d6SPeter Krystad sock_put(ssock->sk); 3312cf7da0d6SPeter Krystad return err; 3313cf7da0d6SPeter Krystad 3314cf7da0d6SPeter Krystad unlock_fail: 3315cf7da0d6SPeter Krystad release_sock(sock->sk); 3316cf7da0d6SPeter Krystad return -EINVAL; 3317cf7da0d6SPeter Krystad } 3318cf7da0d6SPeter Krystad 33198a05661bSPaolo Abeni static __poll_t mptcp_check_readable(struct mptcp_sock *msk) 33208a05661bSPaolo Abeni { 33218a05661bSPaolo Abeni return test_bit(MPTCP_DATA_READY, &msk->flags) ? EPOLLIN | EPOLLRDNORM : 33228a05661bSPaolo Abeni 0; 33238a05661bSPaolo Abeni } 33248a05661bSPaolo Abeni 33258edf0864SFlorian Westphal static __poll_t mptcp_check_writeable(struct mptcp_sock *msk) 33268edf0864SFlorian Westphal { 33278edf0864SFlorian Westphal struct sock *sk = (struct sock *)msk; 33288edf0864SFlorian Westphal 33298edf0864SFlorian Westphal if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN)) 3330dd913410SPaolo Abeni return EPOLLOUT | EPOLLWRNORM; 33318edf0864SFlorian Westphal 33328edf0864SFlorian Westphal if (sk_stream_is_writeable(sk)) 33338edf0864SFlorian Westphal return EPOLLOUT | EPOLLWRNORM; 33348edf0864SFlorian Westphal 33355cf92bbaSPaolo Abeni mptcp_set_nospace(sk); 33366e628cd3SPaolo Abeni smp_mb__after_atomic(); /* msk->flags is changed by write_space cb */ 33376e628cd3SPaolo Abeni if (sk_stream_is_writeable(sk)) 33386e628cd3SPaolo Abeni return EPOLLOUT | EPOLLWRNORM; 33398edf0864SFlorian Westphal 33406e628cd3SPaolo Abeni return 0; 33418edf0864SFlorian Westphal } 33428edf0864SFlorian Westphal 33432303f994SPeter Krystad static __poll_t mptcp_poll(struct file *file, struct socket *sock, 33442303f994SPeter Krystad struct poll_table_struct *wait) 33452303f994SPeter Krystad { 33461891c4a0SFlorian Westphal struct sock *sk = sock->sk; 33478ab183deSPaolo Abeni struct mptcp_sock *msk; 33482303f994SPeter Krystad __poll_t mask = 0; 33498a05661bSPaolo Abeni int state; 33502303f994SPeter Krystad 33511891c4a0SFlorian Westphal msk = mptcp_sk(sk); 33521891c4a0SFlorian Westphal sock_poll_wait(file, sock, wait); 33531891c4a0SFlorian Westphal 33548a05661bSPaolo Abeni state = inet_sk_state_load(sk); 33556719331cSPaolo Abeni pr_debug("msk=%p state=%d flags=%lx", msk, state, msk->flags); 33568a05661bSPaolo Abeni if (state == TCP_LISTEN) 33578a05661bSPaolo Abeni return mptcp_check_readable(msk); 33588a05661bSPaolo Abeni 33598a05661bSPaolo Abeni if (state != TCP_SYN_SENT && state != TCP_SYN_RECV) { 33608a05661bSPaolo Abeni mask |= mptcp_check_readable(msk); 33618edf0864SFlorian Westphal mask |= mptcp_check_writeable(msk); 33628a05661bSPaolo Abeni } 3363dd913410SPaolo Abeni if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE) 3364dd913410SPaolo Abeni mask |= EPOLLHUP; 33651891c4a0SFlorian Westphal if (sk->sk_shutdown & RCV_SHUTDOWN) 33661891c4a0SFlorian Westphal mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 33671891c4a0SFlorian Westphal 336815cc1045SPaolo Abeni /* This barrier is coupled with smp_wmb() in tcp_reset() */ 336915cc1045SPaolo Abeni smp_rmb(); 337015cc1045SPaolo Abeni if (sk->sk_err) 337115cc1045SPaolo Abeni mask |= EPOLLERR; 337215cc1045SPaolo Abeni 33732303f994SPeter Krystad return mask; 33742303f994SPeter Krystad } 33752303f994SPeter Krystad 3376e42f1ac6SFlorian Westphal static const struct proto_ops mptcp_stream_ops = { 3377e42f1ac6SFlorian Westphal .family = PF_INET, 3378e42f1ac6SFlorian Westphal .owner = THIS_MODULE, 33790a3cc579SPaolo Abeni .release = inet_release, 3380e42f1ac6SFlorian Westphal .bind = mptcp_bind, 3381e42f1ac6SFlorian Westphal .connect = mptcp_stream_connect, 3382e42f1ac6SFlorian Westphal .socketpair = sock_no_socketpair, 3383e42f1ac6SFlorian Westphal .accept = mptcp_stream_accept, 3384d2f77c53SPaolo Abeni .getname = inet_getname, 3385e42f1ac6SFlorian Westphal .poll = mptcp_poll, 3386e42f1ac6SFlorian Westphal .ioctl = inet_ioctl, 3387e42f1ac6SFlorian Westphal .gettstamp = sock_gettstamp, 3388e42f1ac6SFlorian Westphal .listen = mptcp_listen, 338976e2a55dSPaolo Abeni .shutdown = inet_shutdown, 3390e42f1ac6SFlorian Westphal .setsockopt = sock_common_setsockopt, 3391e42f1ac6SFlorian Westphal .getsockopt = sock_common_getsockopt, 3392e42f1ac6SFlorian Westphal .sendmsg = inet_sendmsg, 3393e42f1ac6SFlorian Westphal .recvmsg = inet_recvmsg, 3394e42f1ac6SFlorian Westphal .mmap = sock_no_mmap, 3395e42f1ac6SFlorian Westphal .sendpage = inet_sendpage, 3396e42f1ac6SFlorian Westphal }; 33972303f994SPeter Krystad 3398f870fa0bSMat Martineau static struct inet_protosw mptcp_protosw = { 3399f870fa0bSMat Martineau .type = SOCK_STREAM, 3400f870fa0bSMat Martineau .protocol = IPPROTO_MPTCP, 3401f870fa0bSMat Martineau .prot = &mptcp_prot, 34022303f994SPeter Krystad .ops = &mptcp_stream_ops, 34032303f994SPeter Krystad .flags = INET_PROTOSW_ICSK, 3404f870fa0bSMat Martineau }; 3405f870fa0bSMat Martineau 3406b19bc294SPaolo Abeni static int mptcp_napi_poll(struct napi_struct *napi, int budget) 3407b19bc294SPaolo Abeni { 3408b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 3409b19bc294SPaolo Abeni struct mptcp_subflow_context *subflow; 3410b19bc294SPaolo Abeni int work_done = 0; 3411b19bc294SPaolo Abeni 3412b19bc294SPaolo Abeni delegated = container_of(napi, struct mptcp_delegated_action, napi); 3413b19bc294SPaolo Abeni while ((subflow = mptcp_subflow_delegated_next(delegated)) != NULL) { 3414b19bc294SPaolo Abeni struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 3415b19bc294SPaolo Abeni 3416b19bc294SPaolo Abeni bh_lock_sock_nested(ssk); 3417b19bc294SPaolo Abeni if (!sock_owned_by_user(ssk) && 3418b19bc294SPaolo Abeni mptcp_subflow_has_delegated_action(subflow)) 3419b19bc294SPaolo Abeni mptcp_subflow_process_delegated(ssk); 3420b19bc294SPaolo Abeni /* ... elsewhere tcp_release_cb_override already processed 3421b19bc294SPaolo Abeni * the action or will do at next release_sock(). 3422b19bc294SPaolo Abeni * In both case must dequeue the subflow here - on the same 3423b19bc294SPaolo Abeni * CPU that scheduled it. 3424b19bc294SPaolo Abeni */ 3425b19bc294SPaolo Abeni bh_unlock_sock(ssk); 3426b19bc294SPaolo Abeni sock_put(ssk); 3427b19bc294SPaolo Abeni 3428b19bc294SPaolo Abeni if (++work_done == budget) 3429b19bc294SPaolo Abeni return budget; 3430b19bc294SPaolo Abeni } 3431b19bc294SPaolo Abeni 3432b19bc294SPaolo Abeni /* always provide a 0 'work_done' argument, so that napi_complete_done 3433b19bc294SPaolo Abeni * will not try accessing the NULL napi->dev ptr 3434b19bc294SPaolo Abeni */ 3435b19bc294SPaolo Abeni napi_complete_done(napi, 0); 3436b19bc294SPaolo Abeni return work_done; 3437b19bc294SPaolo Abeni } 3438b19bc294SPaolo Abeni 3439d39dcecaSPaolo Abeni void __init mptcp_proto_init(void) 3440f870fa0bSMat Martineau { 3441b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 3442b19bc294SPaolo Abeni int cpu; 3443b19bc294SPaolo Abeni 34442303f994SPeter Krystad mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo; 34452303f994SPeter Krystad 3446d027236cSPaolo Abeni if (percpu_counter_init(&mptcp_sockets_allocated, 0, GFP_KERNEL)) 3447d027236cSPaolo Abeni panic("Failed to allocate MPTCP pcpu counter\n"); 3448d027236cSPaolo Abeni 3449b19bc294SPaolo Abeni init_dummy_netdev(&mptcp_napi_dev); 3450b19bc294SPaolo Abeni for_each_possible_cpu(cpu) { 3451b19bc294SPaolo Abeni delegated = per_cpu_ptr(&mptcp_delegated_actions, cpu); 3452b19bc294SPaolo Abeni INIT_LIST_HEAD(&delegated->head); 3453b19bc294SPaolo Abeni netif_tx_napi_add(&mptcp_napi_dev, &delegated->napi, mptcp_napi_poll, 3454b19bc294SPaolo Abeni NAPI_POLL_WEIGHT); 3455b19bc294SPaolo Abeni napi_enable(&delegated->napi); 3456b19bc294SPaolo Abeni } 3457b19bc294SPaolo Abeni 34582303f994SPeter Krystad mptcp_subflow_init(); 34591b1c7a0eSPeter Krystad mptcp_pm_init(); 34602c5ebd00SPaolo Abeni mptcp_token_init(); 34612303f994SPeter Krystad 3462f870fa0bSMat Martineau if (proto_register(&mptcp_prot, 1) != 0) 3463f870fa0bSMat Martineau panic("Failed to register MPTCP proto.\n"); 3464f870fa0bSMat Martineau 3465f870fa0bSMat Martineau inet_register_protosw(&mptcp_protosw); 34666771bfd9SFlorian Westphal 34676771bfd9SFlorian Westphal BUILD_BUG_ON(sizeof(struct mptcp_skb_cb) > sizeof_field(struct sk_buff, cb)); 3468f870fa0bSMat Martineau } 3469f870fa0bSMat Martineau 3470f870fa0bSMat Martineau #if IS_ENABLED(CONFIG_MPTCP_IPV6) 3471e42f1ac6SFlorian Westphal static const struct proto_ops mptcp_v6_stream_ops = { 3472e42f1ac6SFlorian Westphal .family = PF_INET6, 3473e42f1ac6SFlorian Westphal .owner = THIS_MODULE, 34740a3cc579SPaolo Abeni .release = inet6_release, 3475e42f1ac6SFlorian Westphal .bind = mptcp_bind, 3476e42f1ac6SFlorian Westphal .connect = mptcp_stream_connect, 3477e42f1ac6SFlorian Westphal .socketpair = sock_no_socketpair, 3478e42f1ac6SFlorian Westphal .accept = mptcp_stream_accept, 3479d2f77c53SPaolo Abeni .getname = inet6_getname, 3480e42f1ac6SFlorian Westphal .poll = mptcp_poll, 3481e42f1ac6SFlorian Westphal .ioctl = inet6_ioctl, 3482e42f1ac6SFlorian Westphal .gettstamp = sock_gettstamp, 3483e42f1ac6SFlorian Westphal .listen = mptcp_listen, 348476e2a55dSPaolo Abeni .shutdown = inet_shutdown, 3485e42f1ac6SFlorian Westphal .setsockopt = sock_common_setsockopt, 3486e42f1ac6SFlorian Westphal .getsockopt = sock_common_getsockopt, 3487e42f1ac6SFlorian Westphal .sendmsg = inet6_sendmsg, 3488e42f1ac6SFlorian Westphal .recvmsg = inet6_recvmsg, 3489e42f1ac6SFlorian Westphal .mmap = sock_no_mmap, 3490e42f1ac6SFlorian Westphal .sendpage = inet_sendpage, 3491e42f1ac6SFlorian Westphal #ifdef CONFIG_COMPAT 34923986912fSChristoph Hellwig .compat_ioctl = inet6_compat_ioctl, 3493e42f1ac6SFlorian Westphal #endif 3494e42f1ac6SFlorian Westphal }; 3495e42f1ac6SFlorian Westphal 3496f870fa0bSMat Martineau static struct proto mptcp_v6_prot; 3497f870fa0bSMat Martineau 349879c0949eSPeter Krystad static void mptcp_v6_destroy(struct sock *sk) 349979c0949eSPeter Krystad { 350079c0949eSPeter Krystad mptcp_destroy(sk); 350179c0949eSPeter Krystad inet6_destroy_sock(sk); 350279c0949eSPeter Krystad } 350379c0949eSPeter Krystad 3504f870fa0bSMat Martineau static struct inet_protosw mptcp_v6_protosw = { 3505f870fa0bSMat Martineau .type = SOCK_STREAM, 3506f870fa0bSMat Martineau .protocol = IPPROTO_MPTCP, 3507f870fa0bSMat Martineau .prot = &mptcp_v6_prot, 35082303f994SPeter Krystad .ops = &mptcp_v6_stream_ops, 3509f870fa0bSMat Martineau .flags = INET_PROTOSW_ICSK, 3510f870fa0bSMat Martineau }; 3511f870fa0bSMat Martineau 3512d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void) 3513f870fa0bSMat Martineau { 3514f870fa0bSMat Martineau int err; 3515f870fa0bSMat Martineau 3516f870fa0bSMat Martineau mptcp_v6_prot = mptcp_prot; 3517f870fa0bSMat Martineau strcpy(mptcp_v6_prot.name, "MPTCPv6"); 3518f870fa0bSMat Martineau mptcp_v6_prot.slab = NULL; 351979c0949eSPeter Krystad mptcp_v6_prot.destroy = mptcp_v6_destroy; 3520b0519de8SFlorian Westphal mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock); 3521f870fa0bSMat Martineau 3522f870fa0bSMat Martineau err = proto_register(&mptcp_v6_prot, 1); 3523f870fa0bSMat Martineau if (err) 3524f870fa0bSMat Martineau return err; 3525f870fa0bSMat Martineau 3526f870fa0bSMat Martineau err = inet6_register_protosw(&mptcp_v6_protosw); 3527f870fa0bSMat Martineau if (err) 3528f870fa0bSMat Martineau proto_unregister(&mptcp_v6_prot); 3529f870fa0bSMat Martineau 3530f870fa0bSMat Martineau return err; 3531f870fa0bSMat Martineau } 3532f870fa0bSMat Martineau #endif 3533