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29
30#define pr_fmt(fmt) "IPv6: " fmt
31
32#include <linux/errno.h>
33#include <linux/types.h>
34#include <linux/string.h>
35#include <linux/socket.h>
36#include <linux/sockios.h>
37#include <linux/jiffies.h>
38#include <linux/net.h>
39#include <linux/list.h>
40#include <linux/netdevice.h>
41#include <linux/in6.h>
42#include <linux/ipv6.h>
43#include <linux/icmpv6.h>
44#include <linux/random.h>
45#include <linux/jhash.h>
46#include <linux/skbuff.h>
47#include <linux/slab.h>
48#include <linux/export.h>
49
50#include <net/sock.h>
51#include <net/snmp.h>
52
53#include <net/ipv6.h>
54#include <net/ip6_route.h>
55#include <net/protocol.h>
56#include <net/transp_v6.h>
57#include <net/rawv6.h>
58#include <net/ndisc.h>
59#include <net/addrconf.h>
60#include <net/inet_frag.h>
61#include <net/inet_ecn.h>
62
63static const char ip6_frag_cache_name[] = "ip6-frags";
64
65struct ip6frag_skb_cb {
66 struct inet6_skb_parm h;
67 int offset;
68};
69
70#define FRAG6_CB(skb) ((struct ip6frag_skb_cb *)((skb)->cb))
71
72static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
73{
74 return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
75}
76
77static struct inet_frags ip6_frags;
78
79static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
80 struct net_device *dev);
81
82
83
84
85
86static unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
87 const struct in6_addr *daddr)
88{
89 net_get_random_once(&ip6_frags.rnd, sizeof(ip6_frags.rnd));
90 return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),
91 (__force u32)id, ip6_frags.rnd);
92}
93
94static unsigned int ip6_hashfn(const struct inet_frag_queue *q)
95{
96 const struct frag_queue *fq;
97
98 fq = container_of(q, struct frag_queue, q);
99 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr);
100}
101
102bool ip6_frag_match(const struct inet_frag_queue *q, const void *a)
103{
104 const struct frag_queue *fq;
105 const struct ip6_create_arg *arg = a;
106
107 fq = container_of(q, struct frag_queue, q);
108 return fq->id == arg->id &&
109 fq->user == arg->user &&
110 ipv6_addr_equal(&fq->saddr, arg->src) &&
111 ipv6_addr_equal(&fq->daddr, arg->dst) &&
112 (arg->iif == fq->iif ||
113 !(ipv6_addr_type(arg->dst) & (IPV6_ADDR_MULTICAST |
114 IPV6_ADDR_LINKLOCAL)));
115}
116EXPORT_SYMBOL(ip6_frag_match);
117
118void ip6_frag_init(struct inet_frag_queue *q, const void *a)
119{
120 struct frag_queue *fq = container_of(q, struct frag_queue, q);
121 const struct ip6_create_arg *arg = a;
122
123 fq->id = arg->id;
124 fq->user = arg->user;
125 fq->saddr = *arg->src;
126 fq->daddr = *arg->dst;
127 fq->ecn = arg->ecn;
128}
129EXPORT_SYMBOL(ip6_frag_init);
130
131void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
132 struct inet_frags *frags)
133{
134 struct net_device *dev = NULL;
135
136 spin_lock(&fq->q.lock);
137
138 if (fq->q.flags & INET_FRAG_COMPLETE)
139 goto out;
140
141 inet_frag_kill(&fq->q, frags);
142
143 rcu_read_lock();
144 dev = dev_get_by_index_rcu(net, fq->iif);
145 if (!dev)
146 goto out_rcu_unlock;
147
148 __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
149
150 if (inet_frag_evicting(&fq->q))
151 goto out_rcu_unlock;
152
153 __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
154
155
156 if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !fq->q.fragments)
157 goto out_rcu_unlock;
158
159
160
161
162
163 fq->q.fragments->dev = dev;
164 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
165out_rcu_unlock:
166 rcu_read_unlock();
167out:
168 spin_unlock(&fq->q.lock);
169 inet_frag_put(&fq->q, frags);
170}
171EXPORT_SYMBOL(ip6_expire_frag_queue);
172
173static void ip6_frag_expire(unsigned long data)
174{
175 struct frag_queue *fq;
176 struct net *net;
177
178 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
179 net = container_of(fq->q.net, struct net, ipv6.frags);
180
181 ip6_expire_frag_queue(net, fq, &ip6_frags);
182}
183
184static struct frag_queue *
185fq_find(struct net *net, __be32 id, const struct in6_addr *src,
186 const struct in6_addr *dst, int iif, u8 ecn)
187{
188 struct inet_frag_queue *q;
189 struct ip6_create_arg arg;
190 unsigned int hash;
191
192 arg.id = id;
193 arg.user = IP6_DEFRAG_LOCAL_DELIVER;
194 arg.src = src;
195 arg.dst = dst;
196 arg.iif = iif;
197 arg.ecn = ecn;
198
199 hash = inet6_hash_frag(id, src, dst);
200
201 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
202 if (IS_ERR_OR_NULL(q)) {
203 inet_frag_maybe_warn_overflow(q, pr_fmt());
204 return NULL;
205 }
206 return container_of(q, struct frag_queue, q);
207}
208
209static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
210 struct frag_hdr *fhdr, int nhoff)
211{
212 struct sk_buff *prev, *next;
213 struct net_device *dev;
214 int offset, end;
215 struct net *net = dev_net(skb_dst(skb)->dev);
216 u8 ecn;
217
218 if (fq->q.flags & INET_FRAG_COMPLETE)
219 goto err;
220
221 offset = ntohs(fhdr->frag_off) & ~0x7;
222 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
223 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
224
225 if ((unsigned int)end > IPV6_MAXPLEN) {
226 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
227 IPSTATS_MIB_INHDRERRORS);
228 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
229 ((u8 *)&fhdr->frag_off -
230 skb_network_header(skb)));
231 return -1;
232 }
233
234 ecn = ip6_frag_ecn(ipv6_hdr(skb));
235
236 if (skb->ip_summed == CHECKSUM_COMPLETE) {
237 const unsigned char *nh = skb_network_header(skb);
238 skb->csum = csum_sub(skb->csum,
239 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
240 0));
241 }
242
243
244 if (!(fhdr->frag_off & htons(IP6_MF))) {
245
246
247
248 if (end < fq->q.len ||
249 ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
250 goto err;
251 fq->q.flags |= INET_FRAG_LAST_IN;
252 fq->q.len = end;
253 } else {
254
255
256
257 if (end & 0x7) {
258
259
260
261 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
262 IPSTATS_MIB_INHDRERRORS);
263 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
264 offsetof(struct ipv6hdr, payload_len));
265 return -1;
266 }
267 if (end > fq->q.len) {
268
269 if (fq->q.flags & INET_FRAG_LAST_IN)
270 goto err;
271 fq->q.len = end;
272 }
273 }
274
275 if (end == offset)
276 goto err;
277
278
279 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
280 goto err;
281
282 if (pskb_trim_rcsum(skb, end - offset))
283 goto err;
284
285
286
287
288
289 prev = fq->q.fragments_tail;
290 if (!prev || FRAG6_CB(prev)->offset < offset) {
291 next = NULL;
292 goto found;
293 }
294 prev = NULL;
295 for (next = fq->q.fragments; next != NULL; next = next->next) {
296 if (FRAG6_CB(next)->offset >= offset)
297 break;
298 prev = next;
299 }
300
301found:
302
303
304
305
306
307
308
309
310 if (prev &&
311 (FRAG6_CB(prev)->offset + prev->len) > offset)
312 goto discard_fq;
313
314
315 if (next && FRAG6_CB(next)->offset < end)
316 goto discard_fq;
317
318 FRAG6_CB(skb)->offset = offset;
319
320
321 skb->next = next;
322 if (!next)
323 fq->q.fragments_tail = skb;
324 if (prev)
325 prev->next = skb;
326 else
327 fq->q.fragments = skb;
328
329 dev = skb->dev;
330 if (dev) {
331 fq->iif = dev->ifindex;
332 skb->dev = NULL;
333 }
334 fq->q.stamp = skb->tstamp;
335 fq->q.meat += skb->len;
336 fq->ecn |= ecn;
337 add_frag_mem_limit(fq->q.net, skb->truesize);
338
339
340
341
342 if (offset == 0) {
343 fq->nhoffset = nhoff;
344 fq->q.flags |= INET_FRAG_FIRST_IN;
345 }
346
347 if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
348 fq->q.meat == fq->q.len) {
349 int res;
350 unsigned long orefdst = skb->_skb_refdst;
351
352 skb->_skb_refdst = 0UL;
353 res = ip6_frag_reasm(fq, prev, dev);
354 skb->_skb_refdst = orefdst;
355 return res;
356 }
357
358 skb_dst_drop(skb);
359 return -1;
360
361discard_fq:
362 inet_frag_kill(&fq->q, &ip6_frags);
363err:
364 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
365 IPSTATS_MIB_REASMFAILS);
366 kfree_skb(skb);
367 return -1;
368}
369
370
371
372
373
374
375
376
377
378
379static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
380 struct net_device *dev)
381{
382 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
383 struct sk_buff *fp, *head = fq->q.fragments;
384 int payload_len;
385 unsigned int nhoff;
386 int sum_truesize;
387 u8 ecn;
388
389 inet_frag_kill(&fq->q, &ip6_frags);
390
391 ecn = ip_frag_ecn_table[fq->ecn];
392 if (unlikely(ecn == 0xff))
393 goto out_fail;
394
395
396 if (prev) {
397 head = prev->next;
398 fp = skb_clone(head, GFP_ATOMIC);
399
400 if (!fp)
401 goto out_oom;
402
403 fp->next = head->next;
404 if (!fp->next)
405 fq->q.fragments_tail = fp;
406 prev->next = fp;
407
408 skb_morph(head, fq->q.fragments);
409 head->next = fq->q.fragments->next;
410
411 consume_skb(fq->q.fragments);
412 fq->q.fragments = head;
413 }
414
415 WARN_ON(head == NULL);
416 WARN_ON(FRAG6_CB(head)->offset != 0);
417
418
419 payload_len = ((head->data - skb_network_header(head)) -
420 sizeof(struct ipv6hdr) + fq->q.len -
421 sizeof(struct frag_hdr));
422 if (payload_len > IPV6_MAXPLEN)
423 goto out_oversize;
424
425
426 if (skb_unclone(head, GFP_ATOMIC))
427 goto out_oom;
428
429
430
431
432 if (skb_has_frag_list(head)) {
433 struct sk_buff *clone;
434 int i, plen = 0;
435
436 clone = alloc_skb(0, GFP_ATOMIC);
437 if (!clone)
438 goto out_oom;
439 clone->next = head->next;
440 head->next = clone;
441 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
442 skb_frag_list_init(head);
443 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
444 plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
445 clone->len = clone->data_len = head->data_len - plen;
446 head->data_len -= clone->len;
447 head->len -= clone->len;
448 clone->csum = 0;
449 clone->ip_summed = head->ip_summed;
450 add_frag_mem_limit(fq->q.net, clone->truesize);
451 }
452
453
454
455 nhoff = fq->nhoffset;
456 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
457 memmove(head->head + sizeof(struct frag_hdr), head->head,
458 (head->data - head->head) - sizeof(struct frag_hdr));
459 if (skb_mac_header_was_set(head))
460 head->mac_header += sizeof(struct frag_hdr);
461 head->network_header += sizeof(struct frag_hdr);
462
463 skb_reset_transport_header(head);
464 skb_push(head, head->data - skb_network_header(head));
465
466 sum_truesize = head->truesize;
467 for (fp = head->next; fp;) {
468 bool headstolen;
469 int delta;
470 struct sk_buff *next = fp->next;
471
472 sum_truesize += fp->truesize;
473 if (head->ip_summed != fp->ip_summed)
474 head->ip_summed = CHECKSUM_NONE;
475 else if (head->ip_summed == CHECKSUM_COMPLETE)
476 head->csum = csum_add(head->csum, fp->csum);
477
478 if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
479 kfree_skb_partial(fp, headstolen);
480 } else {
481 if (!skb_shinfo(head)->frag_list)
482 skb_shinfo(head)->frag_list = fp;
483 head->data_len += fp->len;
484 head->len += fp->len;
485 head->truesize += fp->truesize;
486 }
487 fp = next;
488 }
489 sub_frag_mem_limit(fq->q.net, sum_truesize);
490
491 head->next = NULL;
492 head->dev = dev;
493 head->tstamp = fq->q.stamp;
494 ipv6_hdr(head)->payload_len = htons(payload_len);
495 ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
496 IP6CB(head)->nhoff = nhoff;
497 IP6CB(head)->flags |= IP6SKB_FRAGMENTED;
498
499
500 skb_postpush_rcsum(head, skb_network_header(head),
501 skb_network_header_len(head));
502
503 rcu_read_lock();
504 __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
505 rcu_read_unlock();
506 fq->q.fragments = NULL;
507 fq->q.fragments_tail = NULL;
508 return 1;
509
510out_oversize:
511 net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
512 goto out_fail;
513out_oom:
514 net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
515out_fail:
516 rcu_read_lock();
517 __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
518 rcu_read_unlock();
519 return -1;
520}
521
522static int ipv6_frag_rcv(struct sk_buff *skb)
523{
524 struct frag_hdr *fhdr;
525 struct frag_queue *fq;
526 const struct ipv6hdr *hdr = ipv6_hdr(skb);
527 struct net *net = dev_net(skb_dst(skb)->dev);
528
529 if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
530 goto fail_hdr;
531
532 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
533
534
535 if (hdr->payload_len == 0)
536 goto fail_hdr;
537
538 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
539 sizeof(struct frag_hdr))))
540 goto fail_hdr;
541
542 hdr = ipv6_hdr(skb);
543 fhdr = (struct frag_hdr *)skb_transport_header(skb);
544
545 if (!(fhdr->frag_off & htons(0xFFF9))) {
546
547 skb->transport_header += sizeof(struct frag_hdr);
548 __IP6_INC_STATS(net,
549 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
550
551 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
552 IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
553 return 1;
554 }
555
556 fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
557 skb->dev ? skb->dev->ifindex : 0, ip6_frag_ecn(hdr));
558 if (fq) {
559 int ret;
560
561 spin_lock(&fq->q.lock);
562
563 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
564
565 spin_unlock(&fq->q.lock);
566 inet_frag_put(&fq->q, &ip6_frags);
567 return ret;
568 }
569
570 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
571 kfree_skb(skb);
572 return -1;
573
574fail_hdr:
575 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
576 IPSTATS_MIB_INHDRERRORS);
577 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
578 return -1;
579}
580
581static const struct inet6_protocol frag_protocol = {
582 .handler = ipv6_frag_rcv,
583 .flags = INET6_PROTO_NOPOLICY,
584};
585
586#ifdef CONFIG_SYSCTL
587static int zero;
588
589static struct ctl_table ip6_frags_ns_ctl_table[] = {
590 {
591 .procname = "ip6frag_high_thresh",
592 .data = &init_net.ipv6.frags.high_thresh,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = proc_dointvec_minmax,
596 .extra1 = &init_net.ipv6.frags.low_thresh
597 },
598 {
599 .procname = "ip6frag_low_thresh",
600 .data = &init_net.ipv6.frags.low_thresh,
601 .maxlen = sizeof(int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec_minmax,
604 .extra1 = &zero,
605 .extra2 = &init_net.ipv6.frags.high_thresh
606 },
607 {
608 .procname = "ip6frag_time",
609 .data = &init_net.ipv6.frags.timeout,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec_jiffies,
613 },
614 { }
615};
616
617
618static int ip6_frags_secret_interval_unused;
619static struct ctl_table ip6_frags_ctl_table[] = {
620 {
621 .procname = "ip6frag_secret_interval",
622 .data = &ip6_frags_secret_interval_unused,
623 .maxlen = sizeof(int),
624 .mode = 0644,
625 .proc_handler = proc_dointvec_jiffies,
626 },
627 { }
628};
629
630static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
631{
632 struct ctl_table *table;
633 struct ctl_table_header *hdr;
634
635 table = ip6_frags_ns_ctl_table;
636 if (!net_eq(net, &init_net)) {
637 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
638 if (!table)
639 goto err_alloc;
640
641 table[0].data = &net->ipv6.frags.high_thresh;
642 table[0].extra1 = &net->ipv6.frags.low_thresh;
643 table[0].extra2 = &init_net.ipv6.frags.high_thresh;
644 table[1].data = &net->ipv6.frags.low_thresh;
645 table[1].extra2 = &net->ipv6.frags.high_thresh;
646 table[2].data = &net->ipv6.frags.timeout;
647
648
649 if (net->user_ns != &init_user_ns)
650 table[0].procname = NULL;
651 }
652
653 hdr = register_net_sysctl(net, "net/ipv6", table);
654 if (!hdr)
655 goto err_reg;
656
657 net->ipv6.sysctl.frags_hdr = hdr;
658 return 0;
659
660err_reg:
661 if (!net_eq(net, &init_net))
662 kfree(table);
663err_alloc:
664 return -ENOMEM;
665}
666
667static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
668{
669 struct ctl_table *table;
670
671 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
672 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
673 if (!net_eq(net, &init_net))
674 kfree(table);
675}
676
677static struct ctl_table_header *ip6_ctl_header;
678
679static int ip6_frags_sysctl_register(void)
680{
681 ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
682 ip6_frags_ctl_table);
683 return ip6_ctl_header == NULL ? -ENOMEM : 0;
684}
685
686static void ip6_frags_sysctl_unregister(void)
687{
688 unregister_net_sysctl_table(ip6_ctl_header);
689}
690#else
691static int ip6_frags_ns_sysctl_register(struct net *net)
692{
693 return 0;
694}
695
696static void ip6_frags_ns_sysctl_unregister(struct net *net)
697{
698}
699
700static int ip6_frags_sysctl_register(void)
701{
702 return 0;
703}
704
705static void ip6_frags_sysctl_unregister(void)
706{
707}
708#endif
709
710static int __net_init ipv6_frags_init_net(struct net *net)
711{
712 int res;
713
714 net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
715 net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
716 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
717
718 res = inet_frags_init_net(&net->ipv6.frags);
719 if (res)
720 return res;
721 res = ip6_frags_ns_sysctl_register(net);
722 if (res)
723 inet_frags_uninit_net(&net->ipv6.frags);
724 return res;
725}
726
727static void __net_exit ipv6_frags_exit_net(struct net *net)
728{
729 ip6_frags_ns_sysctl_unregister(net);
730 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
731}
732
733static struct pernet_operations ip6_frags_ops = {
734 .init = ipv6_frags_init_net,
735 .exit = ipv6_frags_exit_net,
736};
737
738int __init ipv6_frag_init(void)
739{
740 int ret;
741
742 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
743 if (ret)
744 goto out;
745
746 ret = ip6_frags_sysctl_register();
747 if (ret)
748 goto err_sysctl;
749
750 ret = register_pernet_subsys(&ip6_frags_ops);
751 if (ret)
752 goto err_pernet;
753
754 ip6_frags.hashfn = ip6_hashfn;
755 ip6_frags.constructor = ip6_frag_init;
756 ip6_frags.destructor = NULL;
757 ip6_frags.qsize = sizeof(struct frag_queue);
758 ip6_frags.match = ip6_frag_match;
759 ip6_frags.frag_expire = ip6_frag_expire;
760 ip6_frags.frags_cache_name = ip6_frag_cache_name;
761 ret = inet_frags_init(&ip6_frags);
762 if (ret)
763 goto err_pernet;
764out:
765 return ret;
766
767err_pernet:
768 ip6_frags_sysctl_unregister();
769err_sysctl:
770 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
771 goto out;
772}
773
774void ipv6_frag_exit(void)
775{
776 inet_frags_fini(&ip6_frags);
777 ip6_frags_sysctl_unregister();
778 unregister_pernet_subsys(&ip6_frags_ops);
779 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
780}
781