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Linux/net/ipv6/reassembly.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *      IPv6 fragment reassembly
  4  *      Linux INET6 implementation
  5  *
  6  *      Authors:
  7  *      Pedro Roque             <roque@di.fc.ul.pt>
  8  *
  9  *      Based on: net/ipv4/ip_fragment.c
 10  */
 11 
 12 /*
 13  *      Fixes:
 14  *      Andi Kleen      Make it work with multiple hosts.
 15  *                      More RFC compliance.
 16  *
 17  *      Horst von Brand Add missing #include <linux/string.h>
 18  *      Alexey Kuznetsov        SMP races, threading, cleanup.
 19  *      Patrick McHardy         LRU queue of frag heads for evictor.
 20  *      Mitsuru KANDA @USAGI    Register inet6_protocol{}.
 21  *      David Stevens and
 22  *      YOSHIFUJI,H. @USAGI     Always remove fragment header to
 23  *                              calculate ICV correctly.
 24  */
 25 
 26 #define pr_fmt(fmt) "IPv6: " fmt
 27 
 28 #include <linux/errno.h>
 29 #include <linux/types.h>
 30 #include <linux/string.h>
 31 #include <linux/socket.h>
 32 #include <linux/sockios.h>
 33 #include <linux/jiffies.h>
 34 #include <linux/net.h>
 35 #include <linux/list.h>
 36 #include <linux/netdevice.h>
 37 #include <linux/in6.h>
 38 #include <linux/ipv6.h>
 39 #include <linux/icmpv6.h>
 40 #include <linux/random.h>
 41 #include <linux/jhash.h>
 42 #include <linux/skbuff.h>
 43 #include <linux/slab.h>
 44 #include <linux/export.h>
 45 #include <linux/tcp.h>
 46 #include <linux/udp.h>
 47 
 48 #include <net/sock.h>
 49 #include <net/snmp.h>
 50 
 51 #include <net/ipv6.h>
 52 #include <net/ip6_route.h>
 53 #include <net/protocol.h>
 54 #include <net/transp_v6.h>
 55 #include <net/rawv6.h>
 56 #include <net/ndisc.h>
 57 #include <net/addrconf.h>
 58 #include <net/ipv6_frag.h>
 59 #include <net/inet_ecn.h>
 60 
 61 static const char ip6_frag_cache_name[] = "ip6-frags";
 62 
 63 static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
 64 {
 65         return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
 66 }
 67 
 68 static struct inet_frags ip6_frags;
 69 
 70 static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,
 71                           struct sk_buff *prev_tail, struct net_device *dev);
 72 
 73 static void ip6_frag_expire(struct timer_list *t)
 74 {
 75         struct inet_frag_queue *frag = from_timer(frag, t, timer);
 76         struct frag_queue *fq;
 77 
 78         fq = container_of(frag, struct frag_queue, q);
 79 
 80         ip6frag_expire_frag_queue(fq->q.fqdir->net, fq);
 81 }
 82 
 83 static struct frag_queue *
 84 fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif)
 85 {
 86         struct frag_v6_compare_key key = {
 87                 .id = id,
 88                 .saddr = hdr->saddr,
 89                 .daddr = hdr->daddr,
 90                 .user = IP6_DEFRAG_LOCAL_DELIVER,
 91                 .iif = iif,
 92         };
 93         struct inet_frag_queue *q;
 94 
 95         if (!(ipv6_addr_type(&hdr->daddr) & (IPV6_ADDR_MULTICAST |
 96                                             IPV6_ADDR_LINKLOCAL)))
 97                 key.iif = 0;
 98 
 99         q = inet_frag_find(net->ipv6.fqdir, &key);
100         if (!q)
101                 return NULL;
102 
103         return container_of(q, struct frag_queue, q);
104 }
105 
106 static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
107                           struct frag_hdr *fhdr, int nhoff,
108                           u32 *prob_offset)
109 {
110         struct net *net = dev_net(skb_dst(skb)->dev);
111         int offset, end, fragsize;
112         struct sk_buff *prev_tail;
113         struct net_device *dev;
114         int err = -ENOENT;
115         u8 ecn;
116 
117         if (fq->q.flags & INET_FRAG_COMPLETE)
118                 goto err;
119 
120         err = -EINVAL;
121         offset = ntohs(fhdr->frag_off) & ~0x7;
122         end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
123                         ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
124 
125         if ((unsigned int)end > IPV6_MAXPLEN) {
126                 *prob_offset = (u8 *)&fhdr->frag_off - skb_network_header(skb);
127                 /* note that if prob_offset is set, the skb is freed elsewhere,
128                  * we do not free it here.
129                  */
130                 return -1;
131         }
132 
133         ecn = ip6_frag_ecn(ipv6_hdr(skb));
134 
135         if (skb->ip_summed == CHECKSUM_COMPLETE) {
136                 const unsigned char *nh = skb_network_header(skb);
137                 skb->csum = csum_sub(skb->csum,
138                                      csum_partial(nh, (u8 *)(fhdr + 1) - nh,
139                                                   0));
140         }
141 
142         /* Is this the final fragment? */
143         if (!(fhdr->frag_off & htons(IP6_MF))) {
144                 /* If we already have some bits beyond end
145                  * or have different end, the segment is corrupted.
146                  */
147                 if (end < fq->q.len ||
148                     ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
149                         goto discard_fq;
150                 fq->q.flags |= INET_FRAG_LAST_IN;
151                 fq->q.len = end;
152         } else {
153                 /* Check if the fragment is rounded to 8 bytes.
154                  * Required by the RFC.
155                  */
156                 if (end & 0x7) {
157                         /* RFC2460 says always send parameter problem in
158                          * this case. -DaveM
159                          */
160                         *prob_offset = offsetof(struct ipv6hdr, payload_len);
161                         return -1;
162                 }
163                 if (end > fq->q.len) {
164                         /* Some bits beyond end -> corruption. */
165                         if (fq->q.flags & INET_FRAG_LAST_IN)
166                                 goto discard_fq;
167                         fq->q.len = end;
168                 }
169         }
170 
171         if (end == offset)
172                 goto discard_fq;
173 
174         err = -ENOMEM;
175         /* Point into the IP datagram 'data' part. */
176         if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
177                 goto discard_fq;
178 
179         err = pskb_trim_rcsum(skb, end - offset);
180         if (err)
181                 goto discard_fq;
182 
183         /* Note : skb->rbnode and skb->dev share the same location. */
184         dev = skb->dev;
185         /* Makes sure compiler wont do silly aliasing games */
186         barrier();
187 
188         prev_tail = fq->q.fragments_tail;
189         err = inet_frag_queue_insert(&fq->q, skb, offset, end);
190         if (err)
191                 goto insert_error;
192 
193         if (dev)
194                 fq->iif = dev->ifindex;
195 
196         fq->q.stamp = skb->tstamp;
197         fq->q.mono_delivery_time = skb->mono_delivery_time;
198         fq->q.meat += skb->len;
199         fq->ecn |= ecn;
200         add_frag_mem_limit(fq->q.fqdir, skb->truesize);
201 
202         fragsize = -skb_network_offset(skb) + skb->len;
203         if (fragsize > fq->q.max_size)
204                 fq->q.max_size = fragsize;
205 
206         /* The first fragment.
207          * nhoffset is obtained from the first fragment, of course.
208          */
209         if (offset == 0) {
210                 fq->nhoffset = nhoff;
211                 fq->q.flags |= INET_FRAG_FIRST_IN;
212         }
213 
214         if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
215             fq->q.meat == fq->q.len) {
216                 unsigned long orefdst = skb->_skb_refdst;
217 
218                 skb->_skb_refdst = 0UL;
219                 err = ip6_frag_reasm(fq, skb, prev_tail, dev);
220                 skb->_skb_refdst = orefdst;
221                 return err;
222         }
223 
224         skb_dst_drop(skb);
225         return -EINPROGRESS;
226 
227 insert_error:
228         if (err == IPFRAG_DUP) {
229                 kfree_skb(skb);
230                 return -EINVAL;
231         }
232         err = -EINVAL;
233         __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
234                         IPSTATS_MIB_REASM_OVERLAPS);
235 discard_fq:
236         inet_frag_kill(&fq->q);
237         __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
238                         IPSTATS_MIB_REASMFAILS);
239 err:
240         kfree_skb(skb);
241         return err;
242 }
243 
244 /*
245  *      Check if this packet is complete.
246  *
247  *      It is called with locked fq, and caller must check that
248  *      queue is eligible for reassembly i.e. it is not COMPLETE,
249  *      the last and the first frames arrived and all the bits are here.
250  */
251 static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,
252                           struct sk_buff *prev_tail, struct net_device *dev)
253 {
254         struct net *net = fq->q.fqdir->net;
255         unsigned int nhoff;
256         void *reasm_data;
257         int payload_len;
258         u8 ecn;
259 
260         inet_frag_kill(&fq->q);
261 
262         ecn = ip_frag_ecn_table[fq->ecn];
263         if (unlikely(ecn == 0xff))
264                 goto out_fail;
265 
266         reasm_data = inet_frag_reasm_prepare(&fq->q, skb, prev_tail);
267         if (!reasm_data)
268                 goto out_oom;
269 
270         payload_len = ((skb->data - skb_network_header(skb)) -
271                        sizeof(struct ipv6hdr) + fq->q.len -
272                        sizeof(struct frag_hdr));
273         if (payload_len > IPV6_MAXPLEN)
274                 goto out_oversize;
275 
276         /* We have to remove fragment header from datagram and to relocate
277          * header in order to calculate ICV correctly. */
278         nhoff = fq->nhoffset;
279         skb_network_header(skb)[nhoff] = skb_transport_header(skb)[0];
280         memmove(skb->head + sizeof(struct frag_hdr), skb->head,
281                 (skb->data - skb->head) - sizeof(struct frag_hdr));
282         if (skb_mac_header_was_set(skb))
283                 skb->mac_header += sizeof(struct frag_hdr);
284         skb->network_header += sizeof(struct frag_hdr);
285 
286         skb_reset_transport_header(skb);
287 
288         inet_frag_reasm_finish(&fq->q, skb, reasm_data, true);
289 
290         skb->dev = dev;
291         ipv6_hdr(skb)->payload_len = htons(payload_len);
292         ipv6_change_dsfield(ipv6_hdr(skb), 0xff, ecn);
293         IP6CB(skb)->nhoff = nhoff;
294         IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
295         IP6CB(skb)->frag_max_size = fq->q.max_size;
296 
297         /* Yes, and fold redundant checksum back. 8) */
298         skb_postpush_rcsum(skb, skb_network_header(skb),
299                            skb_network_header_len(skb));
300 
301         rcu_read_lock();
302         __IP6_INC_STATS(net, __in6_dev_stats_get(dev, skb), IPSTATS_MIB_REASMOKS);
303         rcu_read_unlock();
304         fq->q.rb_fragments = RB_ROOT;
305         fq->q.fragments_tail = NULL;
306         fq->q.last_run_head = NULL;
307         return 1;
308 
309 out_oversize:
310         net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
311         goto out_fail;
312 out_oom:
313         net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
314 out_fail:
315         rcu_read_lock();
316         __IP6_INC_STATS(net, __in6_dev_stats_get(dev, skb), IPSTATS_MIB_REASMFAILS);
317         rcu_read_unlock();
318         inet_frag_kill(&fq->q);
319         return -1;
320 }
321 
322 static int ipv6_frag_rcv(struct sk_buff *skb)
323 {
324         struct frag_hdr *fhdr;
325         struct frag_queue *fq;
326         const struct ipv6hdr *hdr = ipv6_hdr(skb);
327         struct net *net = dev_net(skb_dst(skb)->dev);
328         u8 nexthdr;
329         int iif;
330 
331         if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
332                 goto fail_hdr;
333 
334         __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
335 
336         /* Jumbo payload inhibits frag. header */
337         if (hdr->payload_len == 0)
338                 goto fail_hdr;
339 
340         if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
341                                  sizeof(struct frag_hdr))))
342                 goto fail_hdr;
343 
344         hdr = ipv6_hdr(skb);
345         fhdr = (struct frag_hdr *)skb_transport_header(skb);
346 
347         if (!(fhdr->frag_off & htons(IP6_OFFSET | IP6_MF))) {
348                 /* It is not a fragmented frame */
349                 skb->transport_header += sizeof(struct frag_hdr);
350                 __IP6_INC_STATS(net,
351                                 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
352 
353                 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
354                 IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
355                 IP6CB(skb)->frag_max_size = ntohs(hdr->payload_len) +
356                                             sizeof(struct ipv6hdr);
357                 return 1;
358         }
359 
360         /* RFC 8200, Section 4.5 Fragment Header:
361          * If the first fragment does not include all headers through an
362          * Upper-Layer header, then that fragment should be discarded and
363          * an ICMP Parameter Problem, Code 3, message should be sent to
364          * the source of the fragment, with the Pointer field set to zero.
365          */
366         nexthdr = hdr->nexthdr;
367         if (ipv6frag_thdr_truncated(skb, skb_transport_offset(skb), &nexthdr)) {
368                 __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
369                                 IPSTATS_MIB_INHDRERRORS);
370                 icmpv6_param_prob(skb, ICMPV6_HDR_INCOMP, 0);
371                 return -1;
372         }
373 
374         iif = skb->dev ? skb->dev->ifindex : 0;
375         fq = fq_find(net, fhdr->identification, hdr, iif);
376         if (fq) {
377                 u32 prob_offset = 0;
378                 int ret;
379 
380                 spin_lock(&fq->q.lock);
381 
382                 fq->iif = iif;
383                 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff,
384                                      &prob_offset);
385 
386                 spin_unlock(&fq->q.lock);
387                 inet_frag_put(&fq->q);
388                 if (prob_offset) {
389                         __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
390                                         IPSTATS_MIB_INHDRERRORS);
391                         /* icmpv6_param_prob() calls kfree_skb(skb) */
392                         icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, prob_offset);
393                 }
394                 return ret;
395         }
396 
397         __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
398         kfree_skb(skb);
399         return -1;
400 
401 fail_hdr:
402         __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
403                         IPSTATS_MIB_INHDRERRORS);
404         icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
405         return -1;
406 }
407 
408 static const struct inet6_protocol frag_protocol = {
409         .handler        =       ipv6_frag_rcv,
410         .flags          =       INET6_PROTO_NOPOLICY,
411 };
412 
413 #ifdef CONFIG_SYSCTL
414 
415 static struct ctl_table ip6_frags_ns_ctl_table[] = {
416         {
417                 .procname       = "ip6frag_high_thresh",
418                 .maxlen         = sizeof(unsigned long),
419                 .mode           = 0644,
420                 .proc_handler   = proc_doulongvec_minmax,
421         },
422         {
423                 .procname       = "ip6frag_low_thresh",
424                 .maxlen         = sizeof(unsigned long),
425                 .mode           = 0644,
426                 .proc_handler   = proc_doulongvec_minmax,
427         },
428         {
429                 .procname       = "ip6frag_time",
430                 .maxlen         = sizeof(int),
431                 .mode           = 0644,
432                 .proc_handler   = proc_dointvec_jiffies,
433         },
434         { }
435 };
436 
437 /* secret interval has been deprecated */
438 static int ip6_frags_secret_interval_unused;
439 static struct ctl_table ip6_frags_ctl_table[] = {
440         {
441                 .procname       = "ip6frag_secret_interval",
442                 .data           = &ip6_frags_secret_interval_unused,
443                 .maxlen         = sizeof(int),
444                 .mode           = 0644,
445                 .proc_handler   = proc_dointvec_jiffies,
446         },
447         { }
448 };
449 
450 static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
451 {
452         struct ctl_table *table;
453         struct ctl_table_header *hdr;
454 
455         table = ip6_frags_ns_ctl_table;
456         if (!net_eq(net, &init_net)) {
457                 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
458                 if (!table)
459                         goto err_alloc;
460 
461         }
462         table[0].data   = &net->ipv6.fqdir->high_thresh;
463         table[0].extra1 = &net->ipv6.fqdir->low_thresh;
464         table[1].data   = &net->ipv6.fqdir->low_thresh;
465         table[1].extra2 = &net->ipv6.fqdir->high_thresh;
466         table[2].data   = &net->ipv6.fqdir->timeout;
467 
468         hdr = register_net_sysctl(net, "net/ipv6", table);
469         if (!hdr)
470                 goto err_reg;
471 
472         net->ipv6.sysctl.frags_hdr = hdr;
473         return 0;
474 
475 err_reg:
476         if (!net_eq(net, &init_net))
477                 kfree(table);
478 err_alloc:
479         return -ENOMEM;
480 }
481 
482 static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
483 {
484         struct ctl_table *table;
485 
486         table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
487         unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
488         if (!net_eq(net, &init_net))
489                 kfree(table);
490 }
491 
492 static struct ctl_table_header *ip6_ctl_header;
493 
494 static int ip6_frags_sysctl_register(void)
495 {
496         ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
497                         ip6_frags_ctl_table);
498         return ip6_ctl_header == NULL ? -ENOMEM : 0;
499 }
500 
501 static void ip6_frags_sysctl_unregister(void)
502 {
503         unregister_net_sysctl_table(ip6_ctl_header);
504 }
505 #else
506 static int ip6_frags_ns_sysctl_register(struct net *net)
507 {
508         return 0;
509 }
510 
511 static void ip6_frags_ns_sysctl_unregister(struct net *net)
512 {
513 }
514 
515 static int ip6_frags_sysctl_register(void)
516 {
517         return 0;
518 }
519 
520 static void ip6_frags_sysctl_unregister(void)
521 {
522 }
523 #endif
524 
525 static int __net_init ipv6_frags_init_net(struct net *net)
526 {
527         int res;
528 
529         res = fqdir_init(&net->ipv6.fqdir, &ip6_frags, net);
530         if (res < 0)
531                 return res;
532 
533         net->ipv6.fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH;
534         net->ipv6.fqdir->low_thresh = IPV6_FRAG_LOW_THRESH;
535         net->ipv6.fqdir->timeout = IPV6_FRAG_TIMEOUT;
536 
537         res = ip6_frags_ns_sysctl_register(net);
538         if (res < 0)
539                 fqdir_exit(net->ipv6.fqdir);
540         return res;
541 }
542 
543 static void __net_exit ipv6_frags_pre_exit_net(struct net *net)
544 {
545         fqdir_pre_exit(net->ipv6.fqdir);
546 }
547 
548 static void __net_exit ipv6_frags_exit_net(struct net *net)
549 {
550         ip6_frags_ns_sysctl_unregister(net);
551         fqdir_exit(net->ipv6.fqdir);
552 }
553 
554 static struct pernet_operations ip6_frags_ops = {
555         .init           = ipv6_frags_init_net,
556         .pre_exit       = ipv6_frags_pre_exit_net,
557         .exit           = ipv6_frags_exit_net,
558 };
559 
560 static const struct rhashtable_params ip6_rhash_params = {
561         .head_offset            = offsetof(struct inet_frag_queue, node),
562         .hashfn                 = ip6frag_key_hashfn,
563         .obj_hashfn             = ip6frag_obj_hashfn,
564         .obj_cmpfn              = ip6frag_obj_cmpfn,
565         .automatic_shrinking    = true,
566 };
567 
568 int __init ipv6_frag_init(void)
569 {
570         int ret;
571 
572         ip6_frags.constructor = ip6frag_init;
573         ip6_frags.destructor = NULL;
574         ip6_frags.qsize = sizeof(struct frag_queue);
575         ip6_frags.frag_expire = ip6_frag_expire;
576         ip6_frags.frags_cache_name = ip6_frag_cache_name;
577         ip6_frags.rhash_params = ip6_rhash_params;
578         ret = inet_frags_init(&ip6_frags);
579         if (ret)
580                 goto out;
581 
582         ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
583         if (ret)
584                 goto err_protocol;
585 
586         ret = ip6_frags_sysctl_register();
587         if (ret)
588                 goto err_sysctl;
589 
590         ret = register_pernet_subsys(&ip6_frags_ops);
591         if (ret)
592                 goto err_pernet;
593 
594 out:
595         return ret;
596 
597 err_pernet:
598         ip6_frags_sysctl_unregister();
599 err_sysctl:
600         inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
601 err_protocol:
602         inet_frags_fini(&ip6_frags);
603         goto out;
604 }
605 
606 void ipv6_frag_exit(void)
607 {
608         ip6_frags_sysctl_unregister();
609         unregister_pernet_subsys(&ip6_frags_ops);
610         inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
611         inet_frags_fini(&ip6_frags);
612 }
613 

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