1 /*
2 * IPv6 fragment reassembly
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on: net/ipv4/ip_fragment.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /*
17 * Fixes:
18 * Andi Kleen Make it work with multiple hosts.
19 * More RFC compliance.
20 *
21 * Horst von Brand Add missing #include <linux/string.h>
22 * Alexey Kuznetsov SMP races, threading, cleanup.
23 * Patrick McHardy LRU queue of frag heads for evictor.
24 * Mitsuru KANDA @USAGI Register inet6_protocol{}.
25 * David Stevens and
26 * YOSHIFUJI,H. @USAGI Always remove fragment header to
27 * calculate ICV correctly.
28 */
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/ipv6_frag.h>
61 #include <net/inet_ecn.h>
62
63 static const char ip6_frag_cache_name[] = "ip6-frags";
64
ip6_frag_ecn(const struct ipv6hdr * ipv6h)65 static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
66 {
67 return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
68 }
69
70 static struct inet_frags ip6_frags;
71
72 static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
73 struct net_device *dev);
74
ip6_frag_expire(struct timer_list * t)75 static void ip6_frag_expire(struct timer_list *t)
76 {
77 struct inet_frag_queue *frag = from_timer(frag, t, timer);
78 struct frag_queue *fq;
79 struct net *net;
80
81 fq = container_of(frag, struct frag_queue, q);
82 net = container_of(fq->q.net, struct net, ipv6.frags);
83
84 ip6frag_expire_frag_queue(net, fq);
85 }
86
87 static struct frag_queue *
fq_find(struct net * net,__be32 id,const struct ipv6hdr * hdr,int iif)88 fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif)
89 {
90 struct frag_v6_compare_key key = {
91 .id = id,
92 .saddr = hdr->saddr,
93 .daddr = hdr->daddr,
94 .user = IP6_DEFRAG_LOCAL_DELIVER,
95 .iif = iif,
96 };
97 struct inet_frag_queue *q;
98
99 if (!(ipv6_addr_type(&hdr->daddr) & (IPV6_ADDR_MULTICAST |
100 IPV6_ADDR_LINKLOCAL)))
101 key.iif = 0;
102
103 q = inet_frag_find(&net->ipv6.frags, &key);
104 if (!q)
105 return NULL;
106
107 return container_of(q, struct frag_queue, q);
108 }
109
ip6_frag_queue(struct frag_queue * fq,struct sk_buff * skb,struct frag_hdr * fhdr,int nhoff,u32 * prob_offset)110 static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
111 struct frag_hdr *fhdr, int nhoff,
112 u32 *prob_offset)
113 {
114 struct sk_buff *prev, *next;
115 struct net_device *dev;
116 int offset, end, fragsize;
117 struct net *net = dev_net(skb_dst(skb)->dev);
118 u8 ecn;
119
120 if (fq->q.flags & INET_FRAG_COMPLETE)
121 goto err;
122
123 offset = ntohs(fhdr->frag_off) & ~0x7;
124 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
125 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
126
127 if ((unsigned int)end > IPV6_MAXPLEN) {
128 *prob_offset = (u8 *)&fhdr->frag_off - skb_network_header(skb);
129 return -1;
130 }
131
132 ecn = ip6_frag_ecn(ipv6_hdr(skb));
133
134 if (skb->ip_summed == CHECKSUM_COMPLETE) {
135 const unsigned char *nh = skb_network_header(skb);
136 skb->csum = csum_sub(skb->csum,
137 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
138 0));
139 }
140
141 /* Is this the final fragment? */
142 if (!(fhdr->frag_off & htons(IP6_MF))) {
143 /* If we already have some bits beyond end
144 * or have different end, the segment is corrupted.
145 */
146 if (end < fq->q.len ||
147 ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
148 goto err;
149 fq->q.flags |= INET_FRAG_LAST_IN;
150 fq->q.len = end;
151 } else {
152 /* Check if the fragment is rounded to 8 bytes.
153 * Required by the RFC.
154 */
155 if (end & 0x7) {
156 /* RFC2460 says always send parameter problem in
157 * this case. -DaveM
158 */
159 *prob_offset = offsetof(struct ipv6hdr, payload_len);
160 return -1;
161 }
162 if (end > fq->q.len) {
163 /* Some bits beyond end -> corruption. */
164 if (fq->q.flags & INET_FRAG_LAST_IN)
165 goto err;
166 fq->q.len = end;
167 }
168 }
169
170 if (end == offset)
171 goto err;
172
173 /* Point into the IP datagram 'data' part. */
174 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
175 goto err;
176
177 if (pskb_trim_rcsum(skb, end - offset))
178 goto err;
179
180 /* Find out which fragments are in front and at the back of us
181 * in the chain of fragments so far. We must know where to put
182 * this fragment, right?
183 */
184 prev = fq->q.fragments_tail;
185 if (!prev || prev->ip_defrag_offset < offset) {
186 next = NULL;
187 goto found;
188 }
189 prev = NULL;
190 for (next = fq->q.fragments; next != NULL; next = next->next) {
191 if (next->ip_defrag_offset >= offset)
192 break; /* bingo! */
193 prev = next;
194 }
195
196 found:
197 /* RFC5722, Section 4, amended by Errata ID : 3089
198 * When reassembling an IPv6 datagram, if
199 * one or more its constituent fragments is determined to be an
200 * overlapping fragment, the entire datagram (and any constituent
201 * fragments) MUST be silently discarded.
202 */
203
204 /* Check for overlap with preceding fragment. */
205 if (prev &&
206 (prev->ip_defrag_offset + prev->len) > offset)
207 goto discard_fq;
208
209 /* Look for overlap with succeeding segment. */
210 if (next && next->ip_defrag_offset < end)
211 goto discard_fq;
212
213 /* Note : skb->ip_defrag_offset and skb->dev share the same location */
214 dev = skb->dev;
215 if (dev)
216 fq->iif = dev->ifindex;
217 /* Makes sure compiler wont do silly aliasing games */
218 barrier();
219 skb->ip_defrag_offset = offset;
220
221 /* Insert this fragment in the chain of fragments. */
222 skb->next = next;
223 if (!next)
224 fq->q.fragments_tail = skb;
225 if (prev)
226 prev->next = skb;
227 else
228 fq->q.fragments = skb;
229
230 fq->q.stamp = skb->tstamp;
231 fq->q.meat += skb->len;
232 fq->ecn |= ecn;
233 add_frag_mem_limit(fq->q.net, skb->truesize);
234
235 fragsize = -skb_network_offset(skb) + skb->len;
236 if (fragsize > fq->q.max_size)
237 fq->q.max_size = fragsize;
238
239 /* The first fragment.
240 * nhoffset is obtained from the first fragment, of course.
241 */
242 if (offset == 0) {
243 fq->nhoffset = nhoff;
244 fq->q.flags |= INET_FRAG_FIRST_IN;
245 }
246
247 if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
248 fq->q.meat == fq->q.len) {
249 int res;
250 unsigned long orefdst = skb->_skb_refdst;
251
252 skb->_skb_refdst = 0UL;
253 res = ip6_frag_reasm(fq, prev, dev);
254 skb->_skb_refdst = orefdst;
255 return res;
256 }
257
258 skb_dst_drop(skb);
259 return -1;
260
261 discard_fq:
262 inet_frag_kill(&fq->q);
263 err:
264 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
265 IPSTATS_MIB_REASMFAILS);
266 kfree_skb(skb);
267 return -1;
268 }
269
270 /*
271 * Check if this packet is complete.
272 * Returns NULL on failure by any reason, and pointer
273 * to current nexthdr field in reassembled frame.
274 *
275 * It is called with locked fq, and caller must check that
276 * queue is eligible for reassembly i.e. it is not COMPLETE,
277 * the last and the first frames arrived and all the bits are here.
278 */
ip6_frag_reasm(struct frag_queue * fq,struct sk_buff * prev,struct net_device * dev)279 static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
280 struct net_device *dev)
281 {
282 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
283 struct sk_buff *fp, *head = fq->q.fragments;
284 int payload_len;
285 unsigned int nhoff;
286 int sum_truesize;
287 u8 ecn;
288
289 inet_frag_kill(&fq->q);
290
291 ecn = ip_frag_ecn_table[fq->ecn];
292 if (unlikely(ecn == 0xff))
293 goto out_fail;
294
295 /* Make the one we just received the head. */
296 if (prev) {
297 head = prev->next;
298 fp = skb_clone(head, GFP_ATOMIC);
299
300 if (!fp)
301 goto out_oom;
302
303 fp->next = head->next;
304 if (!fp->next)
305 fq->q.fragments_tail = fp;
306 prev->next = fp;
307
308 skb_morph(head, fq->q.fragments);
309 head->next = fq->q.fragments->next;
310
311 consume_skb(fq->q.fragments);
312 fq->q.fragments = head;
313 }
314
315 WARN_ON(head == NULL);
316 WARN_ON(head->ip_defrag_offset != 0);
317
318 /* Unfragmented part is taken from the first segment. */
319 payload_len = ((head->data - skb_network_header(head)) -
320 sizeof(struct ipv6hdr) + fq->q.len -
321 sizeof(struct frag_hdr));
322 if (payload_len > IPV6_MAXPLEN)
323 goto out_oversize;
324
325 /* Head of list must not be cloned. */
326 if (skb_unclone(head, GFP_ATOMIC))
327 goto out_oom;
328
329 /* If the first fragment is fragmented itself, we split
330 * it to two chunks: the first with data and paged part
331 * and the second, holding only fragments. */
332 if (skb_has_frag_list(head)) {
333 struct sk_buff *clone;
334 int i, plen = 0;
335
336 clone = alloc_skb(0, GFP_ATOMIC);
337 if (!clone)
338 goto out_oom;
339 clone->next = head->next;
340 head->next = clone;
341 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
342 skb_frag_list_init(head);
343 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
344 plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
345 clone->len = clone->data_len = head->data_len - plen;
346 head->data_len -= clone->len;
347 head->len -= clone->len;
348 clone->csum = 0;
349 clone->ip_summed = head->ip_summed;
350 add_frag_mem_limit(fq->q.net, clone->truesize);
351 }
352
353 /* We have to remove fragment header from datagram and to relocate
354 * header in order to calculate ICV correctly. */
355 nhoff = fq->nhoffset;
356 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
357 memmove(head->head + sizeof(struct frag_hdr), head->head,
358 (head->data - head->head) - sizeof(struct frag_hdr));
359 if (skb_mac_header_was_set(head))
360 head->mac_header += sizeof(struct frag_hdr);
361 head->network_header += sizeof(struct frag_hdr);
362
363 skb_reset_transport_header(head);
364 skb_push(head, head->data - skb_network_header(head));
365
366 sum_truesize = head->truesize;
367 for (fp = head->next; fp;) {
368 bool headstolen;
369 int delta;
370 struct sk_buff *next = fp->next;
371
372 sum_truesize += fp->truesize;
373 if (head->ip_summed != fp->ip_summed)
374 head->ip_summed = CHECKSUM_NONE;
375 else if (head->ip_summed == CHECKSUM_COMPLETE)
376 head->csum = csum_add(head->csum, fp->csum);
377
378 if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
379 kfree_skb_partial(fp, headstolen);
380 } else {
381 if (!skb_shinfo(head)->frag_list)
382 skb_shinfo(head)->frag_list = fp;
383 head->data_len += fp->len;
384 head->len += fp->len;
385 head->truesize += fp->truesize;
386 }
387 fp = next;
388 }
389 sub_frag_mem_limit(fq->q.net, sum_truesize);
390
391 head->next = NULL;
392 head->dev = dev;
393 head->tstamp = fq->q.stamp;
394 ipv6_hdr(head)->payload_len = htons(payload_len);
395 ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
396 IP6CB(head)->nhoff = nhoff;
397 IP6CB(head)->flags |= IP6SKB_FRAGMENTED;
398 IP6CB(head)->frag_max_size = fq->q.max_size;
399
400 /* Yes, and fold redundant checksum back. 8) */
401 skb_postpush_rcsum(head, skb_network_header(head),
402 skb_network_header_len(head));
403
404 rcu_read_lock();
405 __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
406 rcu_read_unlock();
407 fq->q.fragments = NULL;
408 fq->q.rb_fragments = RB_ROOT;
409 fq->q.fragments_tail = NULL;
410 return 1;
411
412 out_oversize:
413 net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
414 goto out_fail;
415 out_oom:
416 net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
417 out_fail:
418 rcu_read_lock();
419 __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
420 rcu_read_unlock();
421 return -1;
422 }
423
ipv6_frag_rcv(struct sk_buff * skb)424 static int ipv6_frag_rcv(struct sk_buff *skb)
425 {
426 struct frag_hdr *fhdr;
427 struct frag_queue *fq;
428 const struct ipv6hdr *hdr = ipv6_hdr(skb);
429 struct net *net = dev_net(skb_dst(skb)->dev);
430 int iif;
431
432 if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
433 goto fail_hdr;
434
435 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
436
437 /* Jumbo payload inhibits frag. header */
438 if (hdr->payload_len == 0)
439 goto fail_hdr;
440
441 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
442 sizeof(struct frag_hdr))))
443 goto fail_hdr;
444
445 hdr = ipv6_hdr(skb);
446 fhdr = (struct frag_hdr *)skb_transport_header(skb);
447
448 if (!(fhdr->frag_off & htons(0xFFF9))) {
449 /* It is not a fragmented frame */
450 skb->transport_header += sizeof(struct frag_hdr);
451 __IP6_INC_STATS(net,
452 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
453
454 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
455 IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
456 return 1;
457 }
458
459 if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU &&
460 fhdr->frag_off & htons(IP6_MF))
461 goto fail_hdr;
462
463 iif = skb->dev ? skb->dev->ifindex : 0;
464 fq = fq_find(net, fhdr->identification, hdr, iif);
465 if (fq) {
466 u32 prob_offset = 0;
467 int ret;
468
469 spin_lock(&fq->q.lock);
470
471 fq->iif = iif;
472 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff,
473 &prob_offset);
474
475 spin_unlock(&fq->q.lock);
476 inet_frag_put(&fq->q);
477 if (prob_offset) {
478 __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
479 IPSTATS_MIB_INHDRERRORS);
480 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, prob_offset);
481 }
482 return ret;
483 }
484
485 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
486 kfree_skb(skb);
487 return -1;
488
489 fail_hdr:
490 __IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
491 IPSTATS_MIB_INHDRERRORS);
492 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
493 return -1;
494 }
495
496 static const struct inet6_protocol frag_protocol = {
497 .handler = ipv6_frag_rcv,
498 .flags = INET6_PROTO_NOPOLICY,
499 };
500
501 #ifdef CONFIG_SYSCTL
502
503 static struct ctl_table ip6_frags_ns_ctl_table[] = {
504 {
505 .procname = "ip6frag_high_thresh",
506 .data = &init_net.ipv6.frags.high_thresh,
507 .maxlen = sizeof(unsigned long),
508 .mode = 0644,
509 .proc_handler = proc_doulongvec_minmax,
510 .extra1 = &init_net.ipv6.frags.low_thresh
511 },
512 {
513 .procname = "ip6frag_low_thresh",
514 .data = &init_net.ipv6.frags.low_thresh,
515 .maxlen = sizeof(unsigned long),
516 .mode = 0644,
517 .proc_handler = proc_doulongvec_minmax,
518 .extra2 = &init_net.ipv6.frags.high_thresh
519 },
520 {
521 .procname = "ip6frag_time",
522 .data = &init_net.ipv6.frags.timeout,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec_jiffies,
526 },
527 { }
528 };
529
530 /* secret interval has been deprecated */
531 static int ip6_frags_secret_interval_unused;
532 static struct ctl_table ip6_frags_ctl_table[] = {
533 {
534 .procname = "ip6frag_secret_interval",
535 .data = &ip6_frags_secret_interval_unused,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec_jiffies,
539 },
540 { }
541 };
542
ip6_frags_ns_sysctl_register(struct net * net)543 static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
544 {
545 struct ctl_table *table;
546 struct ctl_table_header *hdr;
547
548 table = ip6_frags_ns_ctl_table;
549 if (!net_eq(net, &init_net)) {
550 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
551 if (!table)
552 goto err_alloc;
553
554 table[0].data = &net->ipv6.frags.high_thresh;
555 table[0].extra1 = &net->ipv6.frags.low_thresh;
556 table[0].extra2 = &init_net.ipv6.frags.high_thresh;
557 table[1].data = &net->ipv6.frags.low_thresh;
558 table[1].extra2 = &net->ipv6.frags.high_thresh;
559 table[2].data = &net->ipv6.frags.timeout;
560 }
561
562 hdr = register_net_sysctl(net, "net/ipv6", table);
563 if (!hdr)
564 goto err_reg;
565
566 net->ipv6.sysctl.frags_hdr = hdr;
567 return 0;
568
569 err_reg:
570 if (!net_eq(net, &init_net))
571 kfree(table);
572 err_alloc:
573 return -ENOMEM;
574 }
575
ip6_frags_ns_sysctl_unregister(struct net * net)576 static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
577 {
578 struct ctl_table *table;
579
580 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
581 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
582 if (!net_eq(net, &init_net))
583 kfree(table);
584 }
585
586 static struct ctl_table_header *ip6_ctl_header;
587
ip6_frags_sysctl_register(void)588 static int ip6_frags_sysctl_register(void)
589 {
590 ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
591 ip6_frags_ctl_table);
592 return ip6_ctl_header == NULL ? -ENOMEM : 0;
593 }
594
ip6_frags_sysctl_unregister(void)595 static void ip6_frags_sysctl_unregister(void)
596 {
597 unregister_net_sysctl_table(ip6_ctl_header);
598 }
599 #else
ip6_frags_ns_sysctl_register(struct net * net)600 static int ip6_frags_ns_sysctl_register(struct net *net)
601 {
602 return 0;
603 }
604
ip6_frags_ns_sysctl_unregister(struct net * net)605 static void ip6_frags_ns_sysctl_unregister(struct net *net)
606 {
607 }
608
ip6_frags_sysctl_register(void)609 static int ip6_frags_sysctl_register(void)
610 {
611 return 0;
612 }
613
ip6_frags_sysctl_unregister(void)614 static void ip6_frags_sysctl_unregister(void)
615 {
616 }
617 #endif
618
ipv6_frags_init_net(struct net * net)619 static int __net_init ipv6_frags_init_net(struct net *net)
620 {
621 int res;
622
623 net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
624 net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
625 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
626 net->ipv6.frags.f = &ip6_frags;
627
628 res = inet_frags_init_net(&net->ipv6.frags);
629 if (res < 0)
630 return res;
631
632 res = ip6_frags_ns_sysctl_register(net);
633 if (res < 0)
634 inet_frags_exit_net(&net->ipv6.frags);
635 return res;
636 }
637
ipv6_frags_exit_net(struct net * net)638 static void __net_exit ipv6_frags_exit_net(struct net *net)
639 {
640 ip6_frags_ns_sysctl_unregister(net);
641 inet_frags_exit_net(&net->ipv6.frags);
642 }
643
644 static struct pernet_operations ip6_frags_ops = {
645 .init = ipv6_frags_init_net,
646 .exit = ipv6_frags_exit_net,
647 };
648
649 static const struct rhashtable_params ip6_rhash_params = {
650 .head_offset = offsetof(struct inet_frag_queue, node),
651 .hashfn = ip6frag_key_hashfn,
652 .obj_hashfn = ip6frag_obj_hashfn,
653 .obj_cmpfn = ip6frag_obj_cmpfn,
654 .automatic_shrinking = true,
655 };
656
ipv6_frag_init(void)657 int __init ipv6_frag_init(void)
658 {
659 int ret;
660
661 ip6_frags.constructor = ip6frag_init;
662 ip6_frags.destructor = NULL;
663 ip6_frags.qsize = sizeof(struct frag_queue);
664 ip6_frags.frag_expire = ip6_frag_expire;
665 ip6_frags.frags_cache_name = ip6_frag_cache_name;
666 ip6_frags.rhash_params = ip6_rhash_params;
667 ret = inet_frags_init(&ip6_frags);
668 if (ret)
669 goto out;
670
671 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
672 if (ret)
673 goto err_protocol;
674
675 ret = ip6_frags_sysctl_register();
676 if (ret)
677 goto err_sysctl;
678
679 ret = register_pernet_subsys(&ip6_frags_ops);
680 if (ret)
681 goto err_pernet;
682
683 out:
684 return ret;
685
686 err_pernet:
687 ip6_frags_sysctl_unregister();
688 err_sysctl:
689 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
690 err_protocol:
691 inet_frags_fini(&ip6_frags);
692 goto out;
693 }
694
ipv6_frag_exit(void)695 void ipv6_frag_exit(void)
696 {
697 inet_frags_fini(&ip6_frags);
698 ip6_frags_sysctl_unregister();
699 unregister_pernet_subsys(&ip6_frags_ops);
700 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
701 }
702
