12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2ea81ac2eSAlexander Aring /* 6LoWPAN fragment reassembly 3ea81ac2eSAlexander Aring * 4ea81ac2eSAlexander Aring * Authors: 5ea81ac2eSAlexander Aring * Alexander Aring <aar@pengutronix.de> 6ea81ac2eSAlexander Aring * 7ea81ac2eSAlexander Aring * Based on: net/ipv6/reassembly.c 8ea81ac2eSAlexander Aring */ 9ea81ac2eSAlexander Aring 10ea81ac2eSAlexander Aring #define pr_fmt(fmt) "6LoWPAN: " fmt 11ea81ac2eSAlexander Aring 12ea81ac2eSAlexander Aring #include <linux/net.h> 13ea81ac2eSAlexander Aring #include <linux/list.h> 14ea81ac2eSAlexander Aring #include <linux/netdevice.h> 15ea81ac2eSAlexander Aring #include <linux/random.h> 16ea81ac2eSAlexander Aring #include <linux/jhash.h> 17ea81ac2eSAlexander Aring #include <linux/skbuff.h> 18ea81ac2eSAlexander Aring #include <linux/slab.h> 19ea81ac2eSAlexander Aring #include <linux/export.h> 20ea81ac2eSAlexander Aring 21ea81ac2eSAlexander Aring #include <net/ieee802154_netdev.h> 22ea81ac2eSAlexander Aring #include <net/6lowpan.h> 2370b095c8SFlorian Westphal #include <net/ipv6_frag.h> 24ea81ac2eSAlexander Aring #include <net/inet_frag.h> 25254c5dbeSPeter Oskolkov #include <net/ip.h> 26ea81ac2eSAlexander Aring 278691ee59SAlexander Aring #include "6lowpan_i.h" 28ea81ac2eSAlexander Aring 29ea81ac2eSAlexander Aring static const char lowpan_frags_cache_name[] = "lowpan-frags"; 30ea81ac2eSAlexander Aring 31ea81ac2eSAlexander Aring static struct inet_frags lowpan_frags; 32ea81ac2eSAlexander Aring 33254c5dbeSPeter Oskolkov static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *skb, 34f4606583SAlexander Aring struct sk_buff *prev, struct net_device *ldev); 35ea81ac2eSAlexander Aring 36ea81ac2eSAlexander Aring static void lowpan_frag_init(struct inet_frag_queue *q, const void *a) 37ea81ac2eSAlexander Aring { 38648700f7SEric Dumazet const struct frag_lowpan_compare_key *key = a; 39ea81ac2eSAlexander Aring 40648700f7SEric Dumazet BUILD_BUG_ON(sizeof(*key) > sizeof(q->key)); 41648700f7SEric Dumazet memcpy(&q->key, key, sizeof(*key)); 42ea81ac2eSAlexander Aring } 43ea81ac2eSAlexander Aring 4478802011SKees Cook static void lowpan_frag_expire(struct timer_list *t) 45ea81ac2eSAlexander Aring { 4678802011SKees Cook struct inet_frag_queue *frag = from_timer(frag, t, timer); 47ea81ac2eSAlexander Aring struct frag_queue *fq; 48ea81ac2eSAlexander Aring 4978802011SKees Cook fq = container_of(frag, struct frag_queue, q); 50ea81ac2eSAlexander Aring 51ea81ac2eSAlexander Aring spin_lock(&fq->q.lock); 52ea81ac2eSAlexander Aring 53ea81ac2eSAlexander Aring if (fq->q.flags & INET_FRAG_COMPLETE) 54ea81ac2eSAlexander Aring goto out; 55ea81ac2eSAlexander Aring 56093ba729SEric Dumazet inet_frag_kill(&fq->q); 57ea81ac2eSAlexander Aring out: 58ea81ac2eSAlexander Aring spin_unlock(&fq->q.lock); 59093ba729SEric Dumazet inet_frag_put(&fq->q); 60ea81ac2eSAlexander Aring } 61ea81ac2eSAlexander Aring 62ea81ac2eSAlexander Aring static inline struct lowpan_frag_queue * 6372a5e6bbSAlexander Aring fq_find(struct net *net, const struct lowpan_802154_cb *cb, 64ea81ac2eSAlexander Aring const struct ieee802154_addr *src, 65ea81ac2eSAlexander Aring const struct ieee802154_addr *dst) 66ea81ac2eSAlexander Aring { 67ea81ac2eSAlexander Aring struct netns_ieee802154_lowpan *ieee802154_lowpan = 68ea81ac2eSAlexander Aring net_ieee802154_lowpan(net); 69f18fa5deSAlexander Aring struct frag_lowpan_compare_key key = {}; 70648700f7SEric Dumazet struct inet_frag_queue *q; 71ea81ac2eSAlexander Aring 72f18fa5deSAlexander Aring key.tag = cb->d_tag; 73f18fa5deSAlexander Aring key.d_size = cb->d_size; 74f18fa5deSAlexander Aring key.src = *src; 75f18fa5deSAlexander Aring key.dst = *dst; 76f18fa5deSAlexander Aring 774907abc6SEric Dumazet q = inet_frag_find(ieee802154_lowpan->fqdir, &key); 782d44ed22SEric Dumazet if (!q) 79ea81ac2eSAlexander Aring return NULL; 802d44ed22SEric Dumazet 81ea81ac2eSAlexander Aring return container_of(q, struct lowpan_frag_queue, q); 82ea81ac2eSAlexander Aring } 83ea81ac2eSAlexander Aring 84ea81ac2eSAlexander Aring static int lowpan_frag_queue(struct lowpan_frag_queue *fq, 8572a5e6bbSAlexander Aring struct sk_buff *skb, u8 frag_type) 86ea81ac2eSAlexander Aring { 87254c5dbeSPeter Oskolkov struct sk_buff *prev_tail; 88f4606583SAlexander Aring struct net_device *ldev; 89254c5dbeSPeter Oskolkov int end, offset, err; 90254c5dbeSPeter Oskolkov 91254c5dbeSPeter Oskolkov /* inet_frag_queue_* functions use skb->cb; see struct ipfrag_skb_cb 92254c5dbeSPeter Oskolkov * in inet_fragment.c 93254c5dbeSPeter Oskolkov */ 94254c5dbeSPeter Oskolkov BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(struct inet_skb_parm)); 95254c5dbeSPeter Oskolkov BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(struct inet6_skb_parm)); 96ea81ac2eSAlexander Aring 97ea81ac2eSAlexander Aring if (fq->q.flags & INET_FRAG_COMPLETE) 98ea81ac2eSAlexander Aring goto err; 99ea81ac2eSAlexander Aring 10072a5e6bbSAlexander Aring offset = lowpan_802154_cb(skb)->d_offset << 3; 10172a5e6bbSAlexander Aring end = lowpan_802154_cb(skb)->d_size; 102ea81ac2eSAlexander Aring 103ea81ac2eSAlexander Aring /* Is this the final fragment? */ 104ea81ac2eSAlexander Aring if (offset + skb->len == end) { 105ea81ac2eSAlexander Aring /* If we already have some bits beyond end 106ea81ac2eSAlexander Aring * or have different end, the segment is corrupted. 107ea81ac2eSAlexander Aring */ 108ea81ac2eSAlexander Aring if (end < fq->q.len || 109ea81ac2eSAlexander Aring ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) 110ea81ac2eSAlexander Aring goto err; 111ea81ac2eSAlexander Aring fq->q.flags |= INET_FRAG_LAST_IN; 112ea81ac2eSAlexander Aring fq->q.len = end; 113ea81ac2eSAlexander Aring } else { 114ea81ac2eSAlexander Aring if (end > fq->q.len) { 115ea81ac2eSAlexander Aring /* Some bits beyond end -> corruption. */ 116ea81ac2eSAlexander Aring if (fq->q.flags & INET_FRAG_LAST_IN) 117ea81ac2eSAlexander Aring goto err; 118ea81ac2eSAlexander Aring fq->q.len = end; 119ea81ac2eSAlexander Aring } 120ea81ac2eSAlexander Aring } 121ea81ac2eSAlexander Aring 122f4606583SAlexander Aring ldev = skb->dev; 123f4606583SAlexander Aring if (ldev) 124ea81ac2eSAlexander Aring skb->dev = NULL; 125254c5dbeSPeter Oskolkov barrier(); 126254c5dbeSPeter Oskolkov 127254c5dbeSPeter Oskolkov prev_tail = fq->q.fragments_tail; 128254c5dbeSPeter Oskolkov err = inet_frag_queue_insert(&fq->q, skb, offset, end); 129254c5dbeSPeter Oskolkov if (err) 130254c5dbeSPeter Oskolkov goto err; 131ea81ac2eSAlexander Aring 132ea81ac2eSAlexander Aring fq->q.stamp = skb->tstamp; 133*335c8cf3SMartin KaFai Lau fq->q.mono_delivery_time = skb->mono_delivery_time; 13472a5e6bbSAlexander Aring if (frag_type == LOWPAN_DISPATCH_FRAG1) 135ea81ac2eSAlexander Aring fq->q.flags |= INET_FRAG_FIRST_IN; 13672a5e6bbSAlexander Aring 137ea81ac2eSAlexander Aring fq->q.meat += skb->len; 1386ce3b4dcSEric Dumazet add_frag_mem_limit(fq->q.fqdir, skb->truesize); 139ea81ac2eSAlexander Aring 140ea81ac2eSAlexander Aring if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && 141ea81ac2eSAlexander Aring fq->q.meat == fq->q.len) { 142ea81ac2eSAlexander Aring int res; 143ea81ac2eSAlexander Aring unsigned long orefdst = skb->_skb_refdst; 144ea81ac2eSAlexander Aring 145ea81ac2eSAlexander Aring skb->_skb_refdst = 0UL; 146254c5dbeSPeter Oskolkov res = lowpan_frag_reasm(fq, skb, prev_tail, ldev); 147ea81ac2eSAlexander Aring skb->_skb_refdst = orefdst; 148ea81ac2eSAlexander Aring return res; 149ea81ac2eSAlexander Aring } 150254c5dbeSPeter Oskolkov skb_dst_drop(skb); 151ea81ac2eSAlexander Aring 152ea81ac2eSAlexander Aring return -1; 153ea81ac2eSAlexander Aring err: 154ea81ac2eSAlexander Aring kfree_skb(skb); 155ea81ac2eSAlexander Aring return -1; 156ea81ac2eSAlexander Aring } 157ea81ac2eSAlexander Aring 158ea81ac2eSAlexander Aring /* Check if this packet is complete. 159ea81ac2eSAlexander Aring * 160ea81ac2eSAlexander Aring * It is called with locked fq, and caller must check that 161ea81ac2eSAlexander Aring * queue is eligible for reassembly i.e. it is not COMPLETE, 162ea81ac2eSAlexander Aring * the last and the first frames arrived and all the bits are here. 163ea81ac2eSAlexander Aring */ 164254c5dbeSPeter Oskolkov static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *skb, 165254c5dbeSPeter Oskolkov struct sk_buff *prev_tail, struct net_device *ldev) 166ea81ac2eSAlexander Aring { 167254c5dbeSPeter Oskolkov void *reasm_data; 168ea81ac2eSAlexander Aring 169093ba729SEric Dumazet inet_frag_kill(&fq->q); 170ea81ac2eSAlexander Aring 171254c5dbeSPeter Oskolkov reasm_data = inet_frag_reasm_prepare(&fq->q, skb, prev_tail); 172254c5dbeSPeter Oskolkov if (!reasm_data) 173ea81ac2eSAlexander Aring goto out_oom; 174891584f4SGuillaume Nault inet_frag_reasm_finish(&fq->q, skb, reasm_data, false); 175ea81ac2eSAlexander Aring 176254c5dbeSPeter Oskolkov skb->dev = ldev; 177254c5dbeSPeter Oskolkov skb->tstamp = fq->q.stamp; 178254c5dbeSPeter Oskolkov fq->q.rb_fragments = RB_ROOT; 179ea81ac2eSAlexander Aring fq->q.fragments_tail = NULL; 180254c5dbeSPeter Oskolkov fq->q.last_run_head = NULL; 181ea81ac2eSAlexander Aring 182ea81ac2eSAlexander Aring return 1; 183ea81ac2eSAlexander Aring out_oom: 184ea81ac2eSAlexander Aring net_dbg_ratelimited("lowpan_frag_reasm: no memory for reassembly\n"); 185ea81ac2eSAlexander Aring return -1; 186ea81ac2eSAlexander Aring } 187ea81ac2eSAlexander Aring 18872a5e6bbSAlexander Aring static int lowpan_frag_rx_handlers_result(struct sk_buff *skb, 18972a5e6bbSAlexander Aring lowpan_rx_result res) 19072a5e6bbSAlexander Aring { 19172a5e6bbSAlexander Aring switch (res) { 19272a5e6bbSAlexander Aring case RX_QUEUED: 19372a5e6bbSAlexander Aring return NET_RX_SUCCESS; 19472a5e6bbSAlexander Aring case RX_CONTINUE: 19572a5e6bbSAlexander Aring /* nobody cared about this packet */ 19672a5e6bbSAlexander Aring net_warn_ratelimited("%s: received unknown dispatch\n", 19772a5e6bbSAlexander Aring __func__); 19872a5e6bbSAlexander Aring 199df561f66SGustavo A. R. Silva fallthrough; 20072a5e6bbSAlexander Aring default: 20172a5e6bbSAlexander Aring /* all others failure */ 20272a5e6bbSAlexander Aring return NET_RX_DROP; 20372a5e6bbSAlexander Aring } 20472a5e6bbSAlexander Aring } 20572a5e6bbSAlexander Aring 20672a5e6bbSAlexander Aring static lowpan_rx_result lowpan_frag_rx_h_iphc(struct sk_buff *skb) 20772a5e6bbSAlexander Aring { 20872a5e6bbSAlexander Aring int ret; 20972a5e6bbSAlexander Aring 21072a5e6bbSAlexander Aring if (!lowpan_is_iphc(*skb_network_header(skb))) 21172a5e6bbSAlexander Aring return RX_CONTINUE; 21272a5e6bbSAlexander Aring 21372a5e6bbSAlexander Aring ret = lowpan_iphc_decompress(skb); 21472a5e6bbSAlexander Aring if (ret < 0) 21572a5e6bbSAlexander Aring return RX_DROP; 21672a5e6bbSAlexander Aring 21772a5e6bbSAlexander Aring return RX_QUEUED; 21872a5e6bbSAlexander Aring } 21972a5e6bbSAlexander Aring 22072a5e6bbSAlexander Aring static int lowpan_invoke_frag_rx_handlers(struct sk_buff *skb) 22172a5e6bbSAlexander Aring { 22272a5e6bbSAlexander Aring lowpan_rx_result res; 22372a5e6bbSAlexander Aring 22472a5e6bbSAlexander Aring #define CALL_RXH(rxh) \ 22572a5e6bbSAlexander Aring do { \ 22672a5e6bbSAlexander Aring res = rxh(skb); \ 22772a5e6bbSAlexander Aring if (res != RX_CONTINUE) \ 22872a5e6bbSAlexander Aring goto rxh_next; \ 22972a5e6bbSAlexander Aring } while (0) 23072a5e6bbSAlexander Aring 23172a5e6bbSAlexander Aring /* likely at first */ 23272a5e6bbSAlexander Aring CALL_RXH(lowpan_frag_rx_h_iphc); 23372a5e6bbSAlexander Aring CALL_RXH(lowpan_rx_h_ipv6); 23472a5e6bbSAlexander Aring 23572a5e6bbSAlexander Aring rxh_next: 23672a5e6bbSAlexander Aring return lowpan_frag_rx_handlers_result(skb, res); 23772a5e6bbSAlexander Aring #undef CALL_RXH 23872a5e6bbSAlexander Aring } 23972a5e6bbSAlexander Aring 24072a5e6bbSAlexander Aring #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK 0x07 24172a5e6bbSAlexander Aring #define LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT 8 24272a5e6bbSAlexander Aring 24372a5e6bbSAlexander Aring static int lowpan_get_cb(struct sk_buff *skb, u8 frag_type, 24472a5e6bbSAlexander Aring struct lowpan_802154_cb *cb) 245ea81ac2eSAlexander Aring { 246ea81ac2eSAlexander Aring bool fail; 24772a5e6bbSAlexander Aring u8 high = 0, low = 0; 248ea81ac2eSAlexander Aring __be16 d_tag = 0; 249ea81ac2eSAlexander Aring 25072a5e6bbSAlexander Aring fail = lowpan_fetch_skb(skb, &high, 1); 251ea81ac2eSAlexander Aring fail |= lowpan_fetch_skb(skb, &low, 1); 25272a5e6bbSAlexander Aring /* remove the dispatch value and use first three bits as high value 25372a5e6bbSAlexander Aring * for the datagram size 25472a5e6bbSAlexander Aring */ 25572a5e6bbSAlexander Aring cb->d_size = (high & LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK) << 25672a5e6bbSAlexander Aring LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT | low; 257ea81ac2eSAlexander Aring fail |= lowpan_fetch_skb(skb, &d_tag, 2); 25872a5e6bbSAlexander Aring cb->d_tag = ntohs(d_tag); 259ea81ac2eSAlexander Aring 260ea81ac2eSAlexander Aring if (frag_type == LOWPAN_DISPATCH_FRAGN) { 26172a5e6bbSAlexander Aring fail |= lowpan_fetch_skb(skb, &cb->d_offset, 1); 262ea81ac2eSAlexander Aring } else { 263ea81ac2eSAlexander Aring skb_reset_network_header(skb); 26472a5e6bbSAlexander Aring cb->d_offset = 0; 26572a5e6bbSAlexander Aring /* check if datagram_size has ipv6hdr on FRAG1 */ 26672a5e6bbSAlexander Aring fail |= cb->d_size < sizeof(struct ipv6hdr); 26772a5e6bbSAlexander Aring /* check if we can dereference the dispatch value */ 26872a5e6bbSAlexander Aring fail |= !skb->len; 269ea81ac2eSAlexander Aring } 270ea81ac2eSAlexander Aring 271ea81ac2eSAlexander Aring if (unlikely(fail)) 272ea81ac2eSAlexander Aring return -EIO; 273ea81ac2eSAlexander Aring 274ea81ac2eSAlexander Aring return 0; 275ea81ac2eSAlexander Aring } 276ea81ac2eSAlexander Aring 27772a5e6bbSAlexander Aring int lowpan_frag_rcv(struct sk_buff *skb, u8 frag_type) 278ea81ac2eSAlexander Aring { 279ea81ac2eSAlexander Aring struct lowpan_frag_queue *fq; 280ea81ac2eSAlexander Aring struct net *net = dev_net(skb->dev); 28172a5e6bbSAlexander Aring struct lowpan_802154_cb *cb = lowpan_802154_cb(skb); 282f18fa5deSAlexander Aring struct ieee802154_hdr hdr = {}; 283ea81ac2eSAlexander Aring int err; 284ea81ac2eSAlexander Aring 28572a5e6bbSAlexander Aring if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) 28672a5e6bbSAlexander Aring goto err; 287ea81ac2eSAlexander Aring 28872a5e6bbSAlexander Aring err = lowpan_get_cb(skb, frag_type, cb); 289ea81ac2eSAlexander Aring if (err < 0) 290ea81ac2eSAlexander Aring goto err; 291ea81ac2eSAlexander Aring 29272a5e6bbSAlexander Aring if (frag_type == LOWPAN_DISPATCH_FRAG1) { 29372a5e6bbSAlexander Aring err = lowpan_invoke_frag_rx_handlers(skb); 29472a5e6bbSAlexander Aring if (err == NET_RX_DROP) 29572a5e6bbSAlexander Aring goto err; 29672a5e6bbSAlexander Aring } 29772a5e6bbSAlexander Aring 29872a5e6bbSAlexander Aring if (cb->d_size > IPV6_MIN_MTU) { 299ea81ac2eSAlexander Aring net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n"); 300ea81ac2eSAlexander Aring goto err; 301ea81ac2eSAlexander Aring } 302ea81ac2eSAlexander Aring 30372a5e6bbSAlexander Aring fq = fq_find(net, cb, &hdr.source, &hdr.dest); 304ea81ac2eSAlexander Aring if (fq != NULL) { 305ea81ac2eSAlexander Aring int ret; 306ea81ac2eSAlexander Aring 307ea81ac2eSAlexander Aring spin_lock(&fq->q.lock); 308ea81ac2eSAlexander Aring ret = lowpan_frag_queue(fq, skb, frag_type); 309ea81ac2eSAlexander Aring spin_unlock(&fq->q.lock); 310ea81ac2eSAlexander Aring 311093ba729SEric Dumazet inet_frag_put(&fq->q); 312ea81ac2eSAlexander Aring return ret; 313ea81ac2eSAlexander Aring } 314ea81ac2eSAlexander Aring 315ea81ac2eSAlexander Aring err: 316ea81ac2eSAlexander Aring kfree_skb(skb); 317ea81ac2eSAlexander Aring return -1; 318ea81ac2eSAlexander Aring } 319ea81ac2eSAlexander Aring 320ea81ac2eSAlexander Aring #ifdef CONFIG_SYSCTL 321ea81ac2eSAlexander Aring 322ea81ac2eSAlexander Aring static struct ctl_table lowpan_frags_ns_ctl_table[] = { 323ea81ac2eSAlexander Aring { 324ea81ac2eSAlexander Aring .procname = "6lowpanfrag_high_thresh", 3253e67f106SEric Dumazet .maxlen = sizeof(unsigned long), 326ea81ac2eSAlexander Aring .mode = 0644, 3273e67f106SEric Dumazet .proc_handler = proc_doulongvec_minmax, 328ea81ac2eSAlexander Aring }, 329ea81ac2eSAlexander Aring { 330ea81ac2eSAlexander Aring .procname = "6lowpanfrag_low_thresh", 3313e67f106SEric Dumazet .maxlen = sizeof(unsigned long), 332ea81ac2eSAlexander Aring .mode = 0644, 3333e67f106SEric Dumazet .proc_handler = proc_doulongvec_minmax, 334ea81ac2eSAlexander Aring }, 335ea81ac2eSAlexander Aring { 336ea81ac2eSAlexander Aring .procname = "6lowpanfrag_time", 337ea81ac2eSAlexander Aring .maxlen = sizeof(int), 338ea81ac2eSAlexander Aring .mode = 0644, 339ea81ac2eSAlexander Aring .proc_handler = proc_dointvec_jiffies, 340ea81ac2eSAlexander Aring }, 341ea81ac2eSAlexander Aring { } 342ea81ac2eSAlexander Aring }; 343ea81ac2eSAlexander Aring 344ea81ac2eSAlexander Aring /* secret interval has been deprecated */ 345ea81ac2eSAlexander Aring static int lowpan_frags_secret_interval_unused; 346ea81ac2eSAlexander Aring static struct ctl_table lowpan_frags_ctl_table[] = { 347ea81ac2eSAlexander Aring { 348ea81ac2eSAlexander Aring .procname = "6lowpanfrag_secret_interval", 349ea81ac2eSAlexander Aring .data = &lowpan_frags_secret_interval_unused, 350ea81ac2eSAlexander Aring .maxlen = sizeof(int), 351ea81ac2eSAlexander Aring .mode = 0644, 352ea81ac2eSAlexander Aring .proc_handler = proc_dointvec_jiffies, 353ea81ac2eSAlexander Aring }, 354ea81ac2eSAlexander Aring { } 355ea81ac2eSAlexander Aring }; 356ea81ac2eSAlexander Aring 357ea81ac2eSAlexander Aring static int __net_init lowpan_frags_ns_sysctl_register(struct net *net) 358ea81ac2eSAlexander Aring { 359ea81ac2eSAlexander Aring struct ctl_table *table; 360ea81ac2eSAlexander Aring struct ctl_table_header *hdr; 361ea81ac2eSAlexander Aring struct netns_ieee802154_lowpan *ieee802154_lowpan = 362ea81ac2eSAlexander Aring net_ieee802154_lowpan(net); 363ea81ac2eSAlexander Aring 364ea81ac2eSAlexander Aring table = lowpan_frags_ns_ctl_table; 365ea81ac2eSAlexander Aring if (!net_eq(net, &init_net)) { 366ea81ac2eSAlexander Aring table = kmemdup(table, sizeof(lowpan_frags_ns_ctl_table), 367ea81ac2eSAlexander Aring GFP_KERNEL); 368ea81ac2eSAlexander Aring if (table == NULL) 369ea81ac2eSAlexander Aring goto err_alloc; 370ea81ac2eSAlexander Aring 371d2dfd435SEric Dumazet /* Don't export sysctls to unprivileged users */ 372d2dfd435SEric Dumazet if (net->user_ns != &init_user_ns) 373d2dfd435SEric Dumazet table[0].procname = NULL; 374d2dfd435SEric Dumazet } 375d2dfd435SEric Dumazet 3764907abc6SEric Dumazet table[0].data = &ieee802154_lowpan->fqdir->high_thresh; 3774907abc6SEric Dumazet table[0].extra1 = &ieee802154_lowpan->fqdir->low_thresh; 3784907abc6SEric Dumazet table[1].data = &ieee802154_lowpan->fqdir->low_thresh; 3794907abc6SEric Dumazet table[1].extra2 = &ieee802154_lowpan->fqdir->high_thresh; 3804907abc6SEric Dumazet table[2].data = &ieee802154_lowpan->fqdir->timeout; 381ea81ac2eSAlexander Aring 382ea81ac2eSAlexander Aring hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table); 383ea81ac2eSAlexander Aring if (hdr == NULL) 384ea81ac2eSAlexander Aring goto err_reg; 385ea81ac2eSAlexander Aring 386ea81ac2eSAlexander Aring ieee802154_lowpan->sysctl.frags_hdr = hdr; 387ea81ac2eSAlexander Aring return 0; 388ea81ac2eSAlexander Aring 389ea81ac2eSAlexander Aring err_reg: 390ea81ac2eSAlexander Aring if (!net_eq(net, &init_net)) 391ea81ac2eSAlexander Aring kfree(table); 392ea81ac2eSAlexander Aring err_alloc: 393ea81ac2eSAlexander Aring return -ENOMEM; 394ea81ac2eSAlexander Aring } 395ea81ac2eSAlexander Aring 396ea81ac2eSAlexander Aring static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net) 397ea81ac2eSAlexander Aring { 398ea81ac2eSAlexander Aring struct ctl_table *table; 399ea81ac2eSAlexander Aring struct netns_ieee802154_lowpan *ieee802154_lowpan = 400ea81ac2eSAlexander Aring net_ieee802154_lowpan(net); 401ea81ac2eSAlexander Aring 402ea81ac2eSAlexander Aring table = ieee802154_lowpan->sysctl.frags_hdr->ctl_table_arg; 403ea81ac2eSAlexander Aring unregister_net_sysctl_table(ieee802154_lowpan->sysctl.frags_hdr); 404ea81ac2eSAlexander Aring if (!net_eq(net, &init_net)) 405ea81ac2eSAlexander Aring kfree(table); 406ea81ac2eSAlexander Aring } 407ea81ac2eSAlexander Aring 408ea81ac2eSAlexander Aring static struct ctl_table_header *lowpan_ctl_header; 409ea81ac2eSAlexander Aring 410ea81ac2eSAlexander Aring static int __init lowpan_frags_sysctl_register(void) 411ea81ac2eSAlexander Aring { 412ea81ac2eSAlexander Aring lowpan_ctl_header = register_net_sysctl(&init_net, 413ea81ac2eSAlexander Aring "net/ieee802154/6lowpan", 414ea81ac2eSAlexander Aring lowpan_frags_ctl_table); 415ea81ac2eSAlexander Aring return lowpan_ctl_header == NULL ? -ENOMEM : 0; 416ea81ac2eSAlexander Aring } 417ea81ac2eSAlexander Aring 418ea81ac2eSAlexander Aring static void lowpan_frags_sysctl_unregister(void) 419ea81ac2eSAlexander Aring { 420ea81ac2eSAlexander Aring unregister_net_sysctl_table(lowpan_ctl_header); 421ea81ac2eSAlexander Aring } 422ea81ac2eSAlexander Aring #else 423ea81ac2eSAlexander Aring static inline int lowpan_frags_ns_sysctl_register(struct net *net) 424ea81ac2eSAlexander Aring { 425ea81ac2eSAlexander Aring return 0; 426ea81ac2eSAlexander Aring } 427ea81ac2eSAlexander Aring 428ea81ac2eSAlexander Aring static inline void lowpan_frags_ns_sysctl_unregister(struct net *net) 429ea81ac2eSAlexander Aring { 430ea81ac2eSAlexander Aring } 431ea81ac2eSAlexander Aring 432ea81ac2eSAlexander Aring static inline int __init lowpan_frags_sysctl_register(void) 433ea81ac2eSAlexander Aring { 434ea81ac2eSAlexander Aring return 0; 435ea81ac2eSAlexander Aring } 436ea81ac2eSAlexander Aring 437ea81ac2eSAlexander Aring static inline void lowpan_frags_sysctl_unregister(void) 438ea81ac2eSAlexander Aring { 439ea81ac2eSAlexander Aring } 440ea81ac2eSAlexander Aring #endif 441ea81ac2eSAlexander Aring 442ea81ac2eSAlexander Aring static int __net_init lowpan_frags_init_net(struct net *net) 443ea81ac2eSAlexander Aring { 444ea81ac2eSAlexander Aring struct netns_ieee802154_lowpan *ieee802154_lowpan = 445ea81ac2eSAlexander Aring net_ieee802154_lowpan(net); 446787bea77SEric Dumazet int res; 447ea81ac2eSAlexander Aring 448ea81ac2eSAlexander Aring 449a39aca67SEric Dumazet res = fqdir_init(&ieee802154_lowpan->fqdir, &lowpan_frags, net); 450787bea77SEric Dumazet if (res < 0) 451787bea77SEric Dumazet return res; 4524907abc6SEric Dumazet 4534907abc6SEric Dumazet ieee802154_lowpan->fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH; 4544907abc6SEric Dumazet ieee802154_lowpan->fqdir->low_thresh = IPV6_FRAG_LOW_THRESH; 4554907abc6SEric Dumazet ieee802154_lowpan->fqdir->timeout = IPV6_FRAG_TIMEOUT; 4564907abc6SEric Dumazet 457787bea77SEric Dumazet res = lowpan_frags_ns_sysctl_register(net); 458787bea77SEric Dumazet if (res < 0) 4594907abc6SEric Dumazet fqdir_exit(ieee802154_lowpan->fqdir); 460787bea77SEric Dumazet return res; 461ea81ac2eSAlexander Aring } 462ea81ac2eSAlexander Aring 463d5dd8879SEric Dumazet static void __net_exit lowpan_frags_pre_exit_net(struct net *net) 464d5dd8879SEric Dumazet { 465d5dd8879SEric Dumazet struct netns_ieee802154_lowpan *ieee802154_lowpan = 466d5dd8879SEric Dumazet net_ieee802154_lowpan(net); 467d5dd8879SEric Dumazet 468d5dd8879SEric Dumazet fqdir_pre_exit(ieee802154_lowpan->fqdir); 469d5dd8879SEric Dumazet } 470d5dd8879SEric Dumazet 471ea81ac2eSAlexander Aring static void __net_exit lowpan_frags_exit_net(struct net *net) 472ea81ac2eSAlexander Aring { 473ea81ac2eSAlexander Aring struct netns_ieee802154_lowpan *ieee802154_lowpan = 474ea81ac2eSAlexander Aring net_ieee802154_lowpan(net); 475ea81ac2eSAlexander Aring 476ea81ac2eSAlexander Aring lowpan_frags_ns_sysctl_unregister(net); 4774907abc6SEric Dumazet fqdir_exit(ieee802154_lowpan->fqdir); 478ea81ac2eSAlexander Aring } 479ea81ac2eSAlexander Aring 480ea81ac2eSAlexander Aring static struct pernet_operations lowpan_frags_ops = { 481ea81ac2eSAlexander Aring .init = lowpan_frags_init_net, 482d5dd8879SEric Dumazet .pre_exit = lowpan_frags_pre_exit_net, 483ea81ac2eSAlexander Aring .exit = lowpan_frags_exit_net, 484ea81ac2eSAlexander Aring }; 485ea81ac2eSAlexander Aring 486648700f7SEric Dumazet static u32 lowpan_key_hashfn(const void *data, u32 len, u32 seed) 487648700f7SEric Dumazet { 488648700f7SEric Dumazet return jhash2(data, 489648700f7SEric Dumazet sizeof(struct frag_lowpan_compare_key) / sizeof(u32), seed); 490648700f7SEric Dumazet } 491648700f7SEric Dumazet 492648700f7SEric Dumazet static u32 lowpan_obj_hashfn(const void *data, u32 len, u32 seed) 493648700f7SEric Dumazet { 494648700f7SEric Dumazet const struct inet_frag_queue *fq = data; 495648700f7SEric Dumazet 496648700f7SEric Dumazet return jhash2((const u32 *)&fq->key, 497648700f7SEric Dumazet sizeof(struct frag_lowpan_compare_key) / sizeof(u32), seed); 498648700f7SEric Dumazet } 499648700f7SEric Dumazet 500648700f7SEric Dumazet static int lowpan_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr) 501648700f7SEric Dumazet { 502648700f7SEric Dumazet const struct frag_lowpan_compare_key *key = arg->key; 503648700f7SEric Dumazet const struct inet_frag_queue *fq = ptr; 504648700f7SEric Dumazet 505648700f7SEric Dumazet return !!memcmp(&fq->key, key, sizeof(*key)); 506648700f7SEric Dumazet } 507648700f7SEric Dumazet 508648700f7SEric Dumazet static const struct rhashtable_params lowpan_rhash_params = { 509648700f7SEric Dumazet .head_offset = offsetof(struct inet_frag_queue, node), 510648700f7SEric Dumazet .hashfn = lowpan_key_hashfn, 511648700f7SEric Dumazet .obj_hashfn = lowpan_obj_hashfn, 512648700f7SEric Dumazet .obj_cmpfn = lowpan_obj_cmpfn, 513648700f7SEric Dumazet .automatic_shrinking = true, 514648700f7SEric Dumazet }; 515648700f7SEric Dumazet 516ea81ac2eSAlexander Aring int __init lowpan_net_frag_init(void) 517ea81ac2eSAlexander Aring { 518ea81ac2eSAlexander Aring int ret; 519ea81ac2eSAlexander Aring 520ea81ac2eSAlexander Aring lowpan_frags.constructor = lowpan_frag_init; 521ea81ac2eSAlexander Aring lowpan_frags.destructor = NULL; 522ea81ac2eSAlexander Aring lowpan_frags.qsize = sizeof(struct frag_queue); 523ea81ac2eSAlexander Aring lowpan_frags.frag_expire = lowpan_frag_expire; 524ea81ac2eSAlexander Aring lowpan_frags.frags_cache_name = lowpan_frags_cache_name; 525648700f7SEric Dumazet lowpan_frags.rhash_params = lowpan_rhash_params; 526ea81ac2eSAlexander Aring ret = inet_frags_init(&lowpan_frags); 527ea81ac2eSAlexander Aring if (ret) 528807f1844SEric Dumazet goto out; 529ea81ac2eSAlexander Aring 530807f1844SEric Dumazet ret = lowpan_frags_sysctl_register(); 531807f1844SEric Dumazet if (ret) 532807f1844SEric Dumazet goto err_sysctl; 533807f1844SEric Dumazet 534807f1844SEric Dumazet ret = register_pernet_subsys(&lowpan_frags_ops); 535807f1844SEric Dumazet if (ret) 536807f1844SEric Dumazet goto err_pernet; 537807f1844SEric Dumazet out: 538ea81ac2eSAlexander Aring return ret; 539ea81ac2eSAlexander Aring err_pernet: 540ea81ac2eSAlexander Aring lowpan_frags_sysctl_unregister(); 541807f1844SEric Dumazet err_sysctl: 542807f1844SEric Dumazet inet_frags_fini(&lowpan_frags); 543ea81ac2eSAlexander Aring return ret; 544ea81ac2eSAlexander Aring } 545ea81ac2eSAlexander Aring 546ea81ac2eSAlexander Aring void lowpan_net_frag_exit(void) 547ea81ac2eSAlexander Aring { 548ea81ac2eSAlexander Aring lowpan_frags_sysctl_unregister(); 549ea81ac2eSAlexander Aring unregister_pernet_subsys(&lowpan_frags_ops); 550ae7352d3SEric Dumazet inet_frags_fini(&lowpan_frags); 551ea81ac2eSAlexander Aring } 552