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29#include <linux/errno.h>
30#include <linux/types.h>
31#include <linux/string.h>
32#include <linux/socket.h>
33#include <linux/sockios.h>
34#include <linux/jiffies.h>
35#include <linux/net.h>
36#include <linux/list.h>
37#include <linux/netdevice.h>
38#include <linux/in6.h>
39#include <linux/ipv6.h>
40#include <linux/icmpv6.h>
41#include <linux/random.h>
42#include <linux/jhash.h>
43#include <linux/skbuff.h>
44
45#include <net/sock.h>
46#include <net/snmp.h>
47
48#include <net/ipv6.h>
49#include <net/ip6_route.h>
50#include <net/protocol.h>
51#include <net/transp_v6.h>
52#include <net/rawv6.h>
53#include <net/ndisc.h>
54#include <net/addrconf.h>
55#include <net/inet_frag.h>
56
57struct ip6frag_skb_cb
58{
59 struct inet6_skb_parm h;
60 int offset;
61};
62
63#define FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb))
64
65
66
67
68
69
70struct frag_queue
71{
72 struct inet_frag_queue q;
73
74 __be32 id;
75 struct in6_addr saddr;
76 struct in6_addr daddr;
77
78 int iif;
79 unsigned int csum;
80 __u16 nhoffset;
81};
82
83static struct inet_frags ip6_frags;
84
85int ip6_frag_nqueues(struct net *net)
86{
87 return net->ipv6.frags.nqueues;
88}
89
90int ip6_frag_mem(struct net *net)
91{
92 return atomic_read(&net->ipv6.frags.mem);
93}
94
95static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
96 struct net_device *dev);
97
98
99
100
101
102unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
103 const struct in6_addr *daddr, u32 rnd)
104{
105 u32 a, b, c;
106
107 a = (__force u32)saddr->s6_addr32[0];
108 b = (__force u32)saddr->s6_addr32[1];
109 c = (__force u32)saddr->s6_addr32[2];
110
111 a += JHASH_GOLDEN_RATIO;
112 b += JHASH_GOLDEN_RATIO;
113 c += rnd;
114 __jhash_mix(a, b, c);
115
116 a += (__force u32)saddr->s6_addr32[3];
117 b += (__force u32)daddr->s6_addr32[0];
118 c += (__force u32)daddr->s6_addr32[1];
119 __jhash_mix(a, b, c);
120
121 a += (__force u32)daddr->s6_addr32[2];
122 b += (__force u32)daddr->s6_addr32[3];
123 c += (__force u32)id;
124 __jhash_mix(a, b, c);
125
126 return c & (INETFRAGS_HASHSZ - 1);
127}
128EXPORT_SYMBOL_GPL(inet6_hash_frag);
129
130static unsigned int ip6_hashfn(struct inet_frag_queue *q)
131{
132 struct frag_queue *fq;
133
134 fq = container_of(q, struct frag_queue, q);
135 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd);
136}
137
138int ip6_frag_match(struct inet_frag_queue *q, void *a)
139{
140 struct frag_queue *fq;
141 struct ip6_create_arg *arg = a;
142
143 fq = container_of(q, struct frag_queue, q);
144 return (fq->id == arg->id &&
145 ipv6_addr_equal(&fq->saddr, arg->src) &&
146 ipv6_addr_equal(&fq->daddr, arg->dst));
147}
148EXPORT_SYMBOL(ip6_frag_match);
149
150
151static inline void frag_kfree_skb(struct netns_frags *nf,
152 struct sk_buff *skb, int *work)
153{
154 if (work)
155 *work -= skb->truesize;
156 atomic_sub(skb->truesize, &nf->mem);
157 kfree_skb(skb);
158}
159
160void ip6_frag_init(struct inet_frag_queue *q, void *a)
161{
162 struct frag_queue *fq = container_of(q, struct frag_queue, q);
163 struct ip6_create_arg *arg = a;
164
165 fq->id = arg->id;
166 ipv6_addr_copy(&fq->saddr, arg->src);
167 ipv6_addr_copy(&fq->daddr, arg->dst);
168}
169EXPORT_SYMBOL(ip6_frag_init);
170
171
172
173static __inline__ void fq_put(struct frag_queue *fq)
174{
175 inet_frag_put(&fq->q, &ip6_frags);
176}
177
178
179
180
181static __inline__ void fq_kill(struct frag_queue *fq)
182{
183 inet_frag_kill(&fq->q, &ip6_frags);
184}
185
186static void ip6_evictor(struct net *net, struct inet6_dev *idev)
187{
188 int evicted;
189
190 evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
191 if (evicted)
192 IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
193}
194
195static void ip6_frag_expire(unsigned long data)
196{
197 struct frag_queue *fq;
198 struct net_device *dev = NULL;
199 struct net *net;
200
201 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
202
203 spin_lock(&fq->q.lock);
204
205 if (fq->q.last_in & INET_FRAG_COMPLETE)
206 goto out;
207
208 fq_kill(fq);
209
210 net = container_of(fq->q.net, struct net, ipv6.frags);
211 dev = dev_get_by_index(net, fq->iif);
212 if (!dev)
213 goto out;
214
215 rcu_read_lock();
216 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
217 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
218 rcu_read_unlock();
219
220
221 if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
222 goto out;
223
224
225
226
227
228
229 fq->q.fragments->dev = dev;
230 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
231out:
232 if (dev)
233 dev_put(dev);
234 spin_unlock(&fq->q.lock);
235 fq_put(fq);
236}
237
238static __inline__ struct frag_queue *
239fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst,
240 struct inet6_dev *idev)
241{
242 struct inet_frag_queue *q;
243 struct ip6_create_arg arg;
244 unsigned int hash;
245
246 arg.id = id;
247 arg.src = src;
248 arg.dst = dst;
249
250 read_lock(&ip6_frags.lock);
251 hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd);
252
253 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
254 if (q == NULL)
255 goto oom;
256
257 return container_of(q, struct frag_queue, q);
258
259oom:
260 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS);
261 return NULL;
262}
263
264static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
265 struct frag_hdr *fhdr, int nhoff)
266{
267 struct sk_buff *prev, *next;
268 struct net_device *dev;
269 int offset, end;
270 struct net *net = dev_net(skb->dst->dev);
271
272 if (fq->q.last_in & INET_FRAG_COMPLETE)
273 goto err;
274
275 offset = ntohs(fhdr->frag_off) & ~0x7;
276 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
277 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
278
279 if ((unsigned int)end > IPV6_MAXPLEN) {
280 IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst),
281 IPSTATS_MIB_INHDRERRORS);
282 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
283 ((u8 *)&fhdr->frag_off -
284 skb_network_header(skb)));
285 return -1;
286 }
287
288 if (skb->ip_summed == CHECKSUM_COMPLETE) {
289 const unsigned char *nh = skb_network_header(skb);
290 skb->csum = csum_sub(skb->csum,
291 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
292 0));
293 }
294
295
296 if (!(fhdr->frag_off & htons(IP6_MF))) {
297
298
299
300 if (end < fq->q.len ||
301 ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len))
302 goto err;
303 fq->q.last_in |= INET_FRAG_LAST_IN;
304 fq->q.len = end;
305 } else {
306
307
308
309 if (end & 0x7) {
310
311
312
313 IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst),
314 IPSTATS_MIB_INHDRERRORS);
315 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
316 offsetof(struct ipv6hdr, payload_len));
317 return -1;
318 }
319 if (end > fq->q.len) {
320
321 if (fq->q.last_in & INET_FRAG_LAST_IN)
322 goto err;
323 fq->q.len = end;
324 }
325 }
326
327 if (end == offset)
328 goto err;
329
330
331 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
332 goto err;
333
334 if (pskb_trim_rcsum(skb, end - offset))
335 goto err;
336
337
338
339
340
341 prev = NULL;
342 for(next = fq->q.fragments; next != NULL; next = next->next) {
343 if (FRAG6_CB(next)->offset >= offset)
344 break;
345 prev = next;
346 }
347
348
349
350
351
352 if (prev) {
353 int i = (FRAG6_CB(prev)->offset + prev->len) - offset;
354
355 if (i > 0) {
356 offset += i;
357 if (end <= offset)
358 goto err;
359 if (!pskb_pull(skb, i))
360 goto err;
361 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
362 skb->ip_summed = CHECKSUM_NONE;
363 }
364 }
365
366
367
368
369 while (next && FRAG6_CB(next)->offset < end) {
370 int i = end - FRAG6_CB(next)->offset;
371
372 if (i < next->len) {
373
374
375
376 if (!pskb_pull(next, i))
377 goto err;
378 FRAG6_CB(next)->offset += i;
379 fq->q.meat -= i;
380 if (next->ip_summed != CHECKSUM_UNNECESSARY)
381 next->ip_summed = CHECKSUM_NONE;
382 break;
383 } else {
384 struct sk_buff *free_it = next;
385
386
387
388
389 next = next->next;
390
391 if (prev)
392 prev->next = next;
393 else
394 fq->q.fragments = next;
395
396 fq->q.meat -= free_it->len;
397 frag_kfree_skb(fq->q.net, free_it, NULL);
398 }
399 }
400
401 FRAG6_CB(skb)->offset = offset;
402
403
404 skb->next = next;
405 if (prev)
406 prev->next = skb;
407 else
408 fq->q.fragments = skb;
409
410 dev = skb->dev;
411 if (dev) {
412 fq->iif = dev->ifindex;
413 skb->dev = NULL;
414 }
415 fq->q.stamp = skb->tstamp;
416 fq->q.meat += skb->len;
417 atomic_add(skb->truesize, &fq->q.net->mem);
418
419
420
421
422 if (offset == 0) {
423 fq->nhoffset = nhoff;
424 fq->q.last_in |= INET_FRAG_FIRST_IN;
425 }
426
427 if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
428 fq->q.meat == fq->q.len)
429 return ip6_frag_reasm(fq, prev, dev);
430
431 write_lock(&ip6_frags.lock);
432 list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
433 write_unlock(&ip6_frags.lock);
434 return -1;
435
436err:
437 IP6_INC_STATS(net, ip6_dst_idev(skb->dst),
438 IPSTATS_MIB_REASMFAILS);
439 kfree_skb(skb);
440 return -1;
441}
442
443
444
445
446
447
448
449
450
451
452static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
453 struct net_device *dev)
454{
455 struct sk_buff *fp, *head = fq->q.fragments;
456 int payload_len;
457 unsigned int nhoff;
458
459 fq_kill(fq);
460
461
462 if (prev) {
463 head = prev->next;
464 fp = skb_clone(head, GFP_ATOMIC);
465
466 if (!fp)
467 goto out_oom;
468
469 fp->next = head->next;
470 prev->next = fp;
471
472 skb_morph(head, fq->q.fragments);
473 head->next = fq->q.fragments->next;
474
475 kfree_skb(fq->q.fragments);
476 fq->q.fragments = head;
477 }
478
479 WARN_ON(head == NULL);
480 WARN_ON(FRAG6_CB(head)->offset != 0);
481
482
483 payload_len = ((head->data - skb_network_header(head)) -
484 sizeof(struct ipv6hdr) + fq->q.len -
485 sizeof(struct frag_hdr));
486 if (payload_len > IPV6_MAXPLEN)
487 goto out_oversize;
488
489
490 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
491 goto out_oom;
492
493
494
495
496 if (skb_shinfo(head)->frag_list) {
497 struct sk_buff *clone;
498 int i, plen = 0;
499
500 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
501 goto out_oom;
502 clone->next = head->next;
503 head->next = clone;
504 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
505 skb_shinfo(head)->frag_list = NULL;
506 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
507 plen += skb_shinfo(head)->frags[i].size;
508 clone->len = clone->data_len = head->data_len - plen;
509 head->data_len -= clone->len;
510 head->len -= clone->len;
511 clone->csum = 0;
512 clone->ip_summed = head->ip_summed;
513 atomic_add(clone->truesize, &fq->q.net->mem);
514 }
515
516
517
518 nhoff = fq->nhoffset;
519 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
520 memmove(head->head + sizeof(struct frag_hdr), head->head,
521 (head->data - head->head) - sizeof(struct frag_hdr));
522 head->mac_header += sizeof(struct frag_hdr);
523 head->network_header += sizeof(struct frag_hdr);
524
525 skb_shinfo(head)->frag_list = head->next;
526 skb_reset_transport_header(head);
527 skb_push(head, head->data - skb_network_header(head));
528 atomic_sub(head->truesize, &fq->q.net->mem);
529
530 for (fp=head->next; fp; fp = fp->next) {
531 head->data_len += fp->len;
532 head->len += fp->len;
533 if (head->ip_summed != fp->ip_summed)
534 head->ip_summed = CHECKSUM_NONE;
535 else if (head->ip_summed == CHECKSUM_COMPLETE)
536 head->csum = csum_add(head->csum, fp->csum);
537 head->truesize += fp->truesize;
538 atomic_sub(fp->truesize, &fq->q.net->mem);
539 }
540
541 head->next = NULL;
542 head->dev = dev;
543 head->tstamp = fq->q.stamp;
544 ipv6_hdr(head)->payload_len = htons(payload_len);
545 IP6CB(head)->nhoff = nhoff;
546
547
548 if (head->ip_summed == CHECKSUM_COMPLETE)
549 head->csum = csum_partial(skb_network_header(head),
550 skb_network_header_len(head),
551 head->csum);
552
553 rcu_read_lock();
554 IP6_INC_STATS_BH(dev_net(dev),
555 __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
556 rcu_read_unlock();
557 fq->q.fragments = NULL;
558 return 1;
559
560out_oversize:
561 if (net_ratelimit())
562 printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len);
563 goto out_fail;
564out_oom:
565 if (net_ratelimit())
566 printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n");
567out_fail:
568 rcu_read_lock();
569 IP6_INC_STATS_BH(dev_net(dev),
570 __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
571 rcu_read_unlock();
572 return -1;
573}
574
575static int ipv6_frag_rcv(struct sk_buff *skb)
576{
577 struct frag_hdr *fhdr;
578 struct frag_queue *fq;
579 struct ipv6hdr *hdr = ipv6_hdr(skb);
580 struct net *net = dev_net(skb->dst->dev);
581
582 IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMREQDS);
583
584
585 if (hdr->payload_len==0)
586 goto fail_hdr;
587
588 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
589 sizeof(struct frag_hdr))))
590 goto fail_hdr;
591
592 hdr = ipv6_hdr(skb);
593 fhdr = (struct frag_hdr *)skb_transport_header(skb);
594
595 if (!(fhdr->frag_off & htons(0xFFF9))) {
596
597 skb->transport_header += sizeof(struct frag_hdr);
598 IP6_INC_STATS_BH(net,
599 ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMOKS);
600
601 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
602 return 1;
603 }
604
605 if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
606 ip6_evictor(net, ip6_dst_idev(skb->dst));
607
608 if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
609 ip6_dst_idev(skb->dst))) != NULL) {
610 int ret;
611
612 spin_lock(&fq->q.lock);
613
614 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
615
616 spin_unlock(&fq->q.lock);
617 fq_put(fq);
618 return ret;
619 }
620
621 IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMFAILS);
622 kfree_skb(skb);
623 return -1;
624
625fail_hdr:
626 IP6_INC_STATS(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
627 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
628 return -1;
629}
630
631static struct inet6_protocol frag_protocol =
632{
633 .handler = ipv6_frag_rcv,
634 .flags = INET6_PROTO_NOPOLICY,
635};
636
637#ifdef CONFIG_SYSCTL
638static struct ctl_table ip6_frags_ns_ctl_table[] = {
639 {
640 .ctl_name = NET_IPV6_IP6FRAG_HIGH_THRESH,
641 .procname = "ip6frag_high_thresh",
642 .data = &init_net.ipv6.frags.high_thresh,
643 .maxlen = sizeof(int),
644 .mode = 0644,
645 .proc_handler = &proc_dointvec
646 },
647 {
648 .ctl_name = NET_IPV6_IP6FRAG_LOW_THRESH,
649 .procname = "ip6frag_low_thresh",
650 .data = &init_net.ipv6.frags.low_thresh,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = &proc_dointvec
654 },
655 {
656 .ctl_name = NET_IPV6_IP6FRAG_TIME,
657 .procname = "ip6frag_time",
658 .data = &init_net.ipv6.frags.timeout,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = &proc_dointvec_jiffies,
662 .strategy = &sysctl_jiffies,
663 },
664 { }
665};
666
667static struct ctl_table ip6_frags_ctl_table[] = {
668 {
669 .ctl_name = NET_IPV6_IP6FRAG_SECRET_INTERVAL,
670 .procname = "ip6frag_secret_interval",
671 .data = &ip6_frags.secret_interval,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = &proc_dointvec_jiffies,
675 .strategy = &sysctl_jiffies
676 },
677 { }
678};
679
680static int ip6_frags_ns_sysctl_register(struct net *net)
681{
682 struct ctl_table *table;
683 struct ctl_table_header *hdr;
684
685 table = ip6_frags_ns_ctl_table;
686 if (net != &init_net) {
687 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
688 if (table == NULL)
689 goto err_alloc;
690
691 table[0].data = &net->ipv6.frags.high_thresh;
692 table[1].data = &net->ipv6.frags.low_thresh;
693 table[2].data = &net->ipv6.frags.timeout;
694 }
695
696 hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
697 if (hdr == NULL)
698 goto err_reg;
699
700 net->ipv6.sysctl.frags_hdr = hdr;
701 return 0;
702
703err_reg:
704 if (net != &init_net)
705 kfree(table);
706err_alloc:
707 return -ENOMEM;
708}
709
710static void ip6_frags_ns_sysctl_unregister(struct net *net)
711{
712 struct ctl_table *table;
713
714 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
715 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
716 kfree(table);
717}
718
719static struct ctl_table_header *ip6_ctl_header;
720
721static int ip6_frags_sysctl_register(void)
722{
723 ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
724 ip6_frags_ctl_table);
725 return ip6_ctl_header == NULL ? -ENOMEM : 0;
726}
727
728static void ip6_frags_sysctl_unregister(void)
729{
730 unregister_net_sysctl_table(ip6_ctl_header);
731}
732#else
733static inline int ip6_frags_ns_sysctl_register(struct net *net)
734{
735 return 0;
736}
737
738static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
739{
740}
741
742static inline int ip6_frags_sysctl_register(void)
743{
744 return 0;
745}
746
747static inline void ip6_frags_sysctl_unregister(void)
748{
749}
750#endif
751
752static int ipv6_frags_init_net(struct net *net)
753{
754 net->ipv6.frags.high_thresh = 256 * 1024;
755 net->ipv6.frags.low_thresh = 192 * 1024;
756 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
757
758 inet_frags_init_net(&net->ipv6.frags);
759
760 return ip6_frags_ns_sysctl_register(net);
761}
762
763static void ipv6_frags_exit_net(struct net *net)
764{
765 ip6_frags_ns_sysctl_unregister(net);
766 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
767}
768
769static struct pernet_operations ip6_frags_ops = {
770 .init = ipv6_frags_init_net,
771 .exit = ipv6_frags_exit_net,
772};
773
774int __init ipv6_frag_init(void)
775{
776 int ret;
777
778 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
779 if (ret)
780 goto out;
781
782 ret = ip6_frags_sysctl_register();
783 if (ret)
784 goto err_sysctl;
785
786 ret = register_pernet_subsys(&ip6_frags_ops);
787 if (ret)
788 goto err_pernet;
789
790 ip6_frags.hashfn = ip6_hashfn;
791 ip6_frags.constructor = ip6_frag_init;
792 ip6_frags.destructor = NULL;
793 ip6_frags.skb_free = NULL;
794 ip6_frags.qsize = sizeof(struct frag_queue);
795 ip6_frags.match = ip6_frag_match;
796 ip6_frags.frag_expire = ip6_frag_expire;
797 ip6_frags.secret_interval = 10 * 60 * HZ;
798 inet_frags_init(&ip6_frags);
799out:
800 return ret;
801
802err_pernet:
803 ip6_frags_sysctl_unregister();
804err_sysctl:
805 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
806 goto out;
807}
808
809void ipv6_frag_exit(void)
810{
811 inet_frags_fini(&ip6_frags);
812 ip6_frags_sysctl_unregister();
813 unregister_pernet_subsys(&ip6_frags_ops);
814 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
815}