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22
23#define pr_fmt(fmt) "IPv4: " fmt
24
25#include <linux/compiler.h>
26#include <linux/module.h>
27#include <linux/types.h>
28#include <linux/mm.h>
29#include <linux/jiffies.h>
30#include <linux/skbuff.h>
31#include <linux/list.h>
32#include <linux/ip.h>
33#include <linux/icmp.h>
34#include <linux/netdevice.h>
35#include <linux/jhash.h>
36#include <linux/random.h>
37#include <linux/slab.h>
38#include <net/route.h>
39#include <net/dst.h>
40#include <net/sock.h>
41#include <net/ip.h>
42#include <net/icmp.h>
43#include <net/checksum.h>
44#include <net/inetpeer.h>
45#include <net/inet_frag.h>
46#include <linux/tcp.h>
47#include <linux/udp.h>
48#include <linux/inet.h>
49#include <linux/netfilter_ipv4.h>
50#include <net/inet_ecn.h>
51
52
53
54
55
56
57static int sysctl_ipfrag_max_dist __read_mostly = 64;
58
59struct ipfrag_skb_cb
60{
61 struct inet_skb_parm h;
62 int offset;
63};
64
65#define FRAG_CB(skb) ((struct ipfrag_skb_cb *)((skb)->cb))
66
67
68struct ipq {
69 struct inet_frag_queue q;
70
71 u32 user;
72 __be32 saddr;
73 __be32 daddr;
74 __be16 id;
75 u8 protocol;
76 u8 ecn;
77 int iif;
78 unsigned int rid;
79 struct inet_peer *peer;
80};
81
82static inline u8 ip4_frag_ecn(u8 tos)
83{
84 return 1 << (tos & INET_ECN_MASK);
85}
86
87static struct inet_frags ip4_frags;
88
89int ip_frag_nqueues(struct net *net)
90{
91 return net->ipv4.frags.nqueues;
92}
93
94int ip_frag_mem(struct net *net)
95{
96 return sum_frag_mem_limit(&net->ipv4.frags);
97}
98
99static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
100 struct net_device *dev);
101
102struct ip4_create_arg {
103 struct iphdr *iph;
104 u32 user;
105};
106
107static unsigned int ipqhashfn(__be16 id, __be32 saddr, __be32 daddr, u8 prot)
108{
109 net_get_random_once(&ip4_frags.rnd, sizeof(ip4_frags.rnd));
110 return jhash_3words((__force u32)id << 16 | prot,
111 (__force u32)saddr, (__force u32)daddr,
112 ip4_frags.rnd) & (INETFRAGS_HASHSZ - 1);
113}
114
115static unsigned int ip4_hashfn(struct inet_frag_queue *q)
116{
117 struct ipq *ipq;
118
119 ipq = container_of(q, struct ipq, q);
120 return ipqhashfn(ipq->id, ipq->saddr, ipq->daddr, ipq->protocol);
121}
122
123static bool ip4_frag_match(struct inet_frag_queue *q, void *a)
124{
125 struct ipq *qp;
126 struct ip4_create_arg *arg = a;
127
128 qp = container_of(q, struct ipq, q);
129 return qp->id == arg->iph->id &&
130 qp->saddr == arg->iph->saddr &&
131 qp->daddr == arg->iph->daddr &&
132 qp->protocol == arg->iph->protocol &&
133 qp->user == arg->user;
134}
135
136static void ip4_frag_init(struct inet_frag_queue *q, void *a)
137{
138 struct ipq *qp = container_of(q, struct ipq, q);
139 struct netns_ipv4 *ipv4 = container_of(q->net, struct netns_ipv4,
140 frags);
141 struct net *net = container_of(ipv4, struct net, ipv4);
142
143 struct ip4_create_arg *arg = a;
144
145 qp->protocol = arg->iph->protocol;
146 qp->id = arg->iph->id;
147 qp->ecn = ip4_frag_ecn(arg->iph->tos);
148 qp->saddr = arg->iph->saddr;
149 qp->daddr = arg->iph->daddr;
150 qp->user = arg->user;
151 qp->peer = sysctl_ipfrag_max_dist ?
152 inet_getpeer_v4(net->ipv4.peers, arg->iph->saddr, 1) : NULL;
153}
154
155static __inline__ void ip4_frag_free(struct inet_frag_queue *q)
156{
157 struct ipq *qp;
158
159 qp = container_of(q, struct ipq, q);
160 if (qp->peer)
161 inet_putpeer(qp->peer);
162}
163
164
165
166
167static __inline__ void ipq_put(struct ipq *ipq)
168{
169 inet_frag_put(&ipq->q, &ip4_frags);
170}
171
172
173
174
175static void ipq_kill(struct ipq *ipq)
176{
177 inet_frag_kill(&ipq->q, &ip4_frags);
178}
179
180
181
182
183static void ip_evictor(struct net *net)
184{
185 int evicted;
186
187 evicted = inet_frag_evictor(&net->ipv4.frags, &ip4_frags, false);
188 if (evicted)
189 IP_ADD_STATS_BH(net, IPSTATS_MIB_REASMFAILS, evicted);
190}
191
192
193
194
195static void ip_expire(unsigned long arg)
196{
197 struct ipq *qp;
198 struct net *net;
199
200 qp = container_of((struct inet_frag_queue *) arg, struct ipq, q);
201 net = container_of(qp->q.net, struct net, ipv4.frags);
202
203 spin_lock(&qp->q.lock);
204
205 if (qp->q.last_in & INET_FRAG_COMPLETE)
206 goto out;
207
208 ipq_kill(qp);
209
210 IP_INC_STATS_BH(net, IPSTATS_MIB_REASMTIMEOUT);
211 IP_INC_STATS_BH(net, IPSTATS_MIB_REASMFAILS);
212
213 if ((qp->q.last_in & INET_FRAG_FIRST_IN) && qp->q.fragments != NULL) {
214 struct sk_buff *head = qp->q.fragments;
215 const struct iphdr *iph;
216 int err;
217
218 rcu_read_lock();
219 head->dev = dev_get_by_index_rcu(net, qp->iif);
220 if (!head->dev)
221 goto out_rcu_unlock;
222
223
224 iph = ip_hdr(head);
225 err = ip_route_input_noref(head, iph->daddr, iph->saddr,
226 iph->tos, head->dev);
227 if (err)
228 goto out_rcu_unlock;
229
230
231
232
233
234 if (qp->user == IP_DEFRAG_AF_PACKET ||
235 ((qp->user >= IP_DEFRAG_CONNTRACK_IN) &&
236 (qp->user <= __IP_DEFRAG_CONNTRACK_IN_END) &&
237 (skb_rtable(head)->rt_type != RTN_LOCAL)))
238 goto out_rcu_unlock;
239
240
241
242 icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0);
243out_rcu_unlock:
244 rcu_read_unlock();
245 }
246out:
247 spin_unlock(&qp->q.lock);
248 ipq_put(qp);
249}
250
251
252
253
254static inline struct ipq *ip_find(struct net *net, struct iphdr *iph, u32 user)
255{
256 struct inet_frag_queue *q;
257 struct ip4_create_arg arg;
258 unsigned int hash;
259
260 arg.iph = iph;
261 arg.user = user;
262
263 read_lock(&ip4_frags.lock);
264 hash = ipqhashfn(iph->id, iph->saddr, iph->daddr, iph->protocol);
265
266 q = inet_frag_find(&net->ipv4.frags, &ip4_frags, &arg, hash);
267 if (IS_ERR_OR_NULL(q)) {
268 inet_frag_maybe_warn_overflow(q, pr_fmt());
269 return NULL;
270 }
271 return container_of(q, struct ipq, q);
272}
273
274
275static inline int ip_frag_too_far(struct ipq *qp)
276{
277 struct inet_peer *peer = qp->peer;
278 unsigned int max = sysctl_ipfrag_max_dist;
279 unsigned int start, end;
280
281 int rc;
282
283 if (!peer || !max)
284 return 0;
285
286 start = qp->rid;
287 end = atomic_inc_return(&peer->rid);
288 qp->rid = end;
289
290 rc = qp->q.fragments && (end - start) > max;
291
292 if (rc) {
293 struct net *net;
294
295 net = container_of(qp->q.net, struct net, ipv4.frags);
296 IP_INC_STATS_BH(net, IPSTATS_MIB_REASMFAILS);
297 }
298
299 return rc;
300}
301
302static int ip_frag_reinit(struct ipq *qp)
303{
304 struct sk_buff *fp;
305 unsigned int sum_truesize = 0;
306
307 if (!mod_timer(&qp->q.timer, jiffies + qp->q.net->timeout)) {
308 atomic_inc(&qp->q.refcnt);
309 return -ETIMEDOUT;
310 }
311
312 fp = qp->q.fragments;
313 do {
314 struct sk_buff *xp = fp->next;
315
316 sum_truesize += fp->truesize;
317 kfree_skb(fp);
318 fp = xp;
319 } while (fp);
320 sub_frag_mem_limit(&qp->q, sum_truesize);
321
322 qp->q.last_in = 0;
323 qp->q.len = 0;
324 qp->q.meat = 0;
325 qp->q.fragments = NULL;
326 qp->q.fragments_tail = NULL;
327 qp->iif = 0;
328 qp->ecn = 0;
329
330 return 0;
331}
332
333
334static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
335{
336 struct sk_buff *prev, *next;
337 struct net_device *dev;
338 int flags, offset;
339 int ihl, end;
340 int err = -ENOENT;
341 u8 ecn;
342
343 if (qp->q.last_in & INET_FRAG_COMPLETE)
344 goto err;
345
346 if (!(IPCB(skb)->flags & IPSKB_FRAG_COMPLETE) &&
347 unlikely(ip_frag_too_far(qp)) &&
348 unlikely(err = ip_frag_reinit(qp))) {
349 ipq_kill(qp);
350 goto err;
351 }
352
353 ecn = ip4_frag_ecn(ip_hdr(skb)->tos);
354 offset = ntohs(ip_hdr(skb)->frag_off);
355 flags = offset & ~IP_OFFSET;
356 offset &= IP_OFFSET;
357 offset <<= 3;
358 ihl = ip_hdrlen(skb);
359
360
361 end = offset + skb->len - ihl;
362 err = -EINVAL;
363
364
365 if ((flags & IP_MF) == 0) {
366
367
368
369 if (end < qp->q.len ||
370 ((qp->q.last_in & INET_FRAG_LAST_IN) && end != qp->q.len))
371 goto err;
372 qp->q.last_in |= INET_FRAG_LAST_IN;
373 qp->q.len = end;
374 } else {
375 if (end&7) {
376 end &= ~7;
377 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
378 skb->ip_summed = CHECKSUM_NONE;
379 }
380 if (end > qp->q.len) {
381
382 if (qp->q.last_in & INET_FRAG_LAST_IN)
383 goto err;
384 qp->q.len = end;
385 }
386 }
387 if (end == offset)
388 goto err;
389
390 err = -ENOMEM;
391 if (pskb_pull(skb, ihl) == NULL)
392 goto err;
393
394 err = pskb_trim_rcsum(skb, end - offset);
395 if (err)
396 goto err;
397
398
399
400
401
402 prev = qp->q.fragments_tail;
403 if (!prev || FRAG_CB(prev)->offset < offset) {
404 next = NULL;
405 goto found;
406 }
407 prev = NULL;
408 for (next = qp->q.fragments; next != NULL; next = next->next) {
409 if (FRAG_CB(next)->offset >= offset)
410 break;
411 prev = next;
412 }
413
414found:
415
416
417
418
419 if (prev) {
420 int i = (FRAG_CB(prev)->offset + prev->len) - offset;
421
422 if (i > 0) {
423 offset += i;
424 err = -EINVAL;
425 if (end <= offset)
426 goto err;
427 err = -ENOMEM;
428 if (!pskb_pull(skb, i))
429 goto err;
430 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
431 skb->ip_summed = CHECKSUM_NONE;
432 }
433 }
434
435 err = -ENOMEM;
436
437 while (next && FRAG_CB(next)->offset < end) {
438 int i = end - FRAG_CB(next)->offset;
439
440 if (i < next->len) {
441
442
443
444 if (!pskb_pull(next, i))
445 goto err;
446 FRAG_CB(next)->offset += i;
447 qp->q.meat -= i;
448 if (next->ip_summed != CHECKSUM_UNNECESSARY)
449 next->ip_summed = CHECKSUM_NONE;
450 break;
451 } else {
452 struct sk_buff *free_it = next;
453
454
455
456
457 next = next->next;
458
459 if (prev)
460 prev->next = next;
461 else
462 qp->q.fragments = next;
463
464 qp->q.meat -= free_it->len;
465 sub_frag_mem_limit(&qp->q, free_it->truesize);
466 kfree_skb(free_it);
467 }
468 }
469
470 FRAG_CB(skb)->offset = offset;
471
472
473 skb->next = next;
474 if (!next)
475 qp->q.fragments_tail = skb;
476 if (prev)
477 prev->next = skb;
478 else
479 qp->q.fragments = skb;
480
481 dev = skb->dev;
482 if (dev) {
483 qp->iif = dev->ifindex;
484 skb->dev = NULL;
485 }
486 qp->q.stamp = skb->tstamp;
487 qp->q.meat += skb->len;
488 qp->ecn |= ecn;
489 add_frag_mem_limit(&qp->q, skb->truesize);
490 if (offset == 0)
491 qp->q.last_in |= INET_FRAG_FIRST_IN;
492
493 if (ip_hdr(skb)->frag_off & htons(IP_DF) &&
494 skb->len + ihl > qp->q.max_size)
495 qp->q.max_size = skb->len + ihl;
496
497 if (qp->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
498 qp->q.meat == qp->q.len) {
499 unsigned long orefdst = skb->_skb_refdst;
500
501 skb->_skb_refdst = 0UL;
502 err = ip_frag_reasm(qp, prev, dev);
503 skb->_skb_refdst = orefdst;
504 return err;
505 }
506
507 skb_dst_drop(skb);
508 inet_frag_lru_move(&qp->q);
509 return -EINPROGRESS;
510
511err:
512 kfree_skb(skb);
513 return err;
514}
515
516
517
518
519static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
520 struct net_device *dev)
521{
522 struct net *net = container_of(qp->q.net, struct net, ipv4.frags);
523 struct iphdr *iph;
524 struct sk_buff *fp, *head = qp->q.fragments;
525 int len;
526 int ihlen;
527 int err;
528 int sum_truesize;
529 u8 ecn;
530
531 ipq_kill(qp);
532
533 ecn = ip_frag_ecn_table[qp->ecn];
534 if (unlikely(ecn == 0xff)) {
535 err = -EINVAL;
536 goto out_fail;
537 }
538
539 if (prev) {
540 head = prev->next;
541 fp = skb_clone(head, GFP_ATOMIC);
542 if (!fp)
543 goto out_nomem;
544
545 fp->next = head->next;
546 if (!fp->next)
547 qp->q.fragments_tail = fp;
548 prev->next = fp;
549
550 skb_morph(head, qp->q.fragments);
551 head->next = qp->q.fragments->next;
552
553 consume_skb(qp->q.fragments);
554 qp->q.fragments = head;
555 }
556
557 WARN_ON(head == NULL);
558 WARN_ON(FRAG_CB(head)->offset != 0);
559
560
561 ihlen = ip_hdrlen(head);
562 len = ihlen + qp->q.len;
563
564 err = -E2BIG;
565 if (len > 65535)
566 goto out_oversize;
567
568
569 if (skb_unclone(head, GFP_ATOMIC))
570 goto out_nomem;
571
572
573
574
575 if (skb_has_frag_list(head)) {
576 struct sk_buff *clone;
577 int i, plen = 0;
578
579 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
580 goto out_nomem;
581 clone->next = head->next;
582 head->next = clone;
583 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
584 skb_frag_list_init(head);
585 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
586 plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
587 clone->len = clone->data_len = head->data_len - plen;
588 head->data_len -= clone->len;
589 head->len -= clone->len;
590 clone->csum = 0;
591 clone->ip_summed = head->ip_summed;
592 add_frag_mem_limit(&qp->q, clone->truesize);
593 }
594
595 skb_push(head, head->data - skb_network_header(head));
596
597 sum_truesize = head->truesize;
598 for (fp = head->next; fp;) {
599 bool headstolen;
600 int delta;
601 struct sk_buff *next = fp->next;
602
603 sum_truesize += fp->truesize;
604 if (head->ip_summed != fp->ip_summed)
605 head->ip_summed = CHECKSUM_NONE;
606 else if (head->ip_summed == CHECKSUM_COMPLETE)
607 head->csum = csum_add(head->csum, fp->csum);
608
609 if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
610 kfree_skb_partial(fp, headstolen);
611 } else {
612 if (!skb_shinfo(head)->frag_list)
613 skb_shinfo(head)->frag_list = fp;
614 head->data_len += fp->len;
615 head->len += fp->len;
616 head->truesize += fp->truesize;
617 }
618 fp = next;
619 }
620 sub_frag_mem_limit(&qp->q, sum_truesize);
621
622 head->next = NULL;
623 head->dev = dev;
624 head->tstamp = qp->q.stamp;
625 IPCB(head)->frag_max_size = qp->q.max_size;
626
627 iph = ip_hdr(head);
628
629 iph->frag_off = qp->q.max_size ? htons(IP_DF) : 0;
630 iph->tot_len = htons(len);
631 iph->tos |= ecn;
632 IP_INC_STATS_BH(net, IPSTATS_MIB_REASMOKS);
633 qp->q.fragments = NULL;
634 qp->q.fragments_tail = NULL;
635 return 0;
636
637out_nomem:
638 LIMIT_NETDEBUG(KERN_ERR pr_fmt("queue_glue: no memory for gluing queue %p\n"),
639 qp);
640 err = -ENOMEM;
641 goto out_fail;
642out_oversize:
643 net_info_ratelimited("Oversized IP packet from %pI4\n", &qp->saddr);
644out_fail:
645 IP_INC_STATS_BH(net, IPSTATS_MIB_REASMFAILS);
646 return err;
647}
648
649
650int ip_defrag(struct sk_buff *skb, u32 user)
651{
652 struct ipq *qp;
653 struct net *net;
654
655 net = skb->dev ? dev_net(skb->dev) : dev_net(skb_dst(skb)->dev);
656 IP_INC_STATS_BH(net, IPSTATS_MIB_REASMREQDS);
657
658
659 ip_evictor(net);
660
661
662 if ((qp = ip_find(net, ip_hdr(skb), user)) != NULL) {
663 int ret;
664
665 spin_lock(&qp->q.lock);
666
667 ret = ip_frag_queue(qp, skb);
668
669 spin_unlock(&qp->q.lock);
670 ipq_put(qp);
671 return ret;
672 }
673
674 IP_INC_STATS_BH(net, IPSTATS_MIB_REASMFAILS);
675 kfree_skb(skb);
676 return -ENOMEM;
677}
678EXPORT_SYMBOL(ip_defrag);
679
680struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
681{
682 struct iphdr iph;
683 u32 len;
684
685 if (skb->protocol != htons(ETH_P_IP))
686 return skb;
687
688 if (!skb_copy_bits(skb, 0, &iph, sizeof(iph)))
689 return skb;
690
691 if (iph.ihl < 5 || iph.version != 4)
692 return skb;
693
694 len = ntohs(iph.tot_len);
695 if (skb->len < len || len < (iph.ihl * 4))
696 return skb;
697
698 if (ip_is_fragment(&iph)) {
699 skb = skb_share_check(skb, GFP_ATOMIC);
700 if (skb) {
701 if (!pskb_may_pull(skb, iph.ihl*4))
702 return skb;
703 if (pskb_trim_rcsum(skb, len))
704 return skb;
705 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
706 if (ip_defrag(skb, user))
707 return NULL;
708 skb_clear_hash(skb);
709 }
710 }
711 return skb;
712}
713EXPORT_SYMBOL(ip_check_defrag);
714
715#ifdef CONFIG_SYSCTL
716static int zero;
717
718static struct ctl_table ip4_frags_ns_ctl_table[] = {
719 {
720 .procname = "ipfrag_high_thresh",
721 .data = &init_net.ipv4.frags.high_thresh,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec
725 },
726 {
727 .procname = "ipfrag_low_thresh",
728 .data = &init_net.ipv4.frags.low_thresh,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec
732 },
733 {
734 .procname = "ipfrag_time",
735 .data = &init_net.ipv4.frags.timeout,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = proc_dointvec_jiffies,
739 },
740 { }
741};
742
743static struct ctl_table ip4_frags_ctl_table[] = {
744 {
745 .procname = "ipfrag_secret_interval",
746 .data = &ip4_frags.secret_interval,
747 .maxlen = sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dointvec_jiffies,
750 },
751 {
752 .procname = "ipfrag_max_dist",
753 .data = &sysctl_ipfrag_max_dist,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec_minmax,
757 .extra1 = &zero
758 },
759 { }
760};
761
762static int __net_init ip4_frags_ns_ctl_register(struct net *net)
763{
764 struct ctl_table *table;
765 struct ctl_table_header *hdr;
766
767 table = ip4_frags_ns_ctl_table;
768 if (!net_eq(net, &init_net)) {
769 table = kmemdup(table, sizeof(ip4_frags_ns_ctl_table), GFP_KERNEL);
770 if (table == NULL)
771 goto err_alloc;
772
773 table[0].data = &net->ipv4.frags.high_thresh;
774 table[1].data = &net->ipv4.frags.low_thresh;
775 table[2].data = &net->ipv4.frags.timeout;
776
777
778 if (net->user_ns != &init_user_ns)
779 table[0].procname = NULL;
780 }
781
782 hdr = register_net_sysctl(net, "net/ipv4", table);
783 if (hdr == NULL)
784 goto err_reg;
785
786 net->ipv4.frags_hdr = hdr;
787 return 0;
788
789err_reg:
790 if (!net_eq(net, &init_net))
791 kfree(table);
792err_alloc:
793 return -ENOMEM;
794}
795
796static void __net_exit ip4_frags_ns_ctl_unregister(struct net *net)
797{
798 struct ctl_table *table;
799
800 table = net->ipv4.frags_hdr->ctl_table_arg;
801 unregister_net_sysctl_table(net->ipv4.frags_hdr);
802 kfree(table);
803}
804
805static void ip4_frags_ctl_register(void)
806{
807 register_net_sysctl(&init_net, "net/ipv4", ip4_frags_ctl_table);
808}
809#else
810static inline int ip4_frags_ns_ctl_register(struct net *net)
811{
812 return 0;
813}
814
815static inline void ip4_frags_ns_ctl_unregister(struct net *net)
816{
817}
818
819static inline void ip4_frags_ctl_register(void)
820{
821}
822#endif
823
824static int __net_init ipv4_frags_init_net(struct net *net)
825{
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840 net->ipv4.frags.high_thresh = 4 * 1024 * 1024;
841 net->ipv4.frags.low_thresh = 3 * 1024 * 1024;
842
843
844
845
846
847 net->ipv4.frags.timeout = IP_FRAG_TIME;
848
849 inet_frags_init_net(&net->ipv4.frags);
850
851 return ip4_frags_ns_ctl_register(net);
852}
853
854static void __net_exit ipv4_frags_exit_net(struct net *net)
855{
856 ip4_frags_ns_ctl_unregister(net);
857 inet_frags_exit_net(&net->ipv4.frags, &ip4_frags);
858}
859
860static struct pernet_operations ip4_frags_ops = {
861 .init = ipv4_frags_init_net,
862 .exit = ipv4_frags_exit_net,
863};
864
865void __init ipfrag_init(void)
866{
867 ip4_frags_ctl_register();
868 register_pernet_subsys(&ip4_frags_ops);
869 ip4_frags.hashfn = ip4_hashfn;
870 ip4_frags.constructor = ip4_frag_init;
871 ip4_frags.destructor = ip4_frag_free;
872 ip4_frags.skb_free = NULL;
873 ip4_frags.qsize = sizeof(struct ipq);
874 ip4_frags.match = ip4_frag_match;
875 ip4_frags.frag_expire = ip_expire;
876 ip4_frags.secret_interval = 10 * 60 * HZ;
877 inet_frags_init(&ip4_frags);
878}
879