thinkpad-acpi: don't fail to load the entire module due to ALSA problems
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / reassembly.c
blob4d18699f93fd63e8f3466e216581d0f507a51d98
1 /*
2 * IPv6 fragment reassembly
3 * Linux INET6 implementation
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on: net/ipv4/ip_fragment.c
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.
17 * Fixes:
18 * Andi Kleen Make it work with multiple hosts.
19 * More RFC compliance.
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.
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>
45 #include <net/sock.h>
46 #include <net/snmp.h>
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>
57 struct ip6frag_skb_cb
59 struct inet6_skb_parm h;
60 int offset;
63 #define FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb))
67 * Equivalent of ipv4 struct ipq
70 struct frag_queue
72 struct inet_frag_queue q;
74 __be32 id; /* fragment id */
75 u32 user;
76 struct in6_addr saddr;
77 struct in6_addr daddr;
79 int iif;
80 unsigned int csum;
81 __u16 nhoffset;
84 static struct inet_frags ip6_frags;
86 int ip6_frag_nqueues(struct net *net)
88 return net->ipv6.frags.nqueues;
91 int ip6_frag_mem(struct net *net)
93 return atomic_read(&net->ipv6.frags.mem);
96 static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
97 struct net_device *dev);
100 * callers should be careful not to use the hash value outside the ipfrag_lock
101 * as doing so could race with ipfrag_hash_rnd being recalculated.
103 unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
104 const struct in6_addr *daddr, u32 rnd)
106 u32 a, b, c;
108 a = (__force u32)saddr->s6_addr32[0];
109 b = (__force u32)saddr->s6_addr32[1];
110 c = (__force u32)saddr->s6_addr32[2];
112 a += JHASH_GOLDEN_RATIO;
113 b += JHASH_GOLDEN_RATIO;
114 c += rnd;
115 __jhash_mix(a, b, c);
117 a += (__force u32)saddr->s6_addr32[3];
118 b += (__force u32)daddr->s6_addr32[0];
119 c += (__force u32)daddr->s6_addr32[1];
120 __jhash_mix(a, b, c);
122 a += (__force u32)daddr->s6_addr32[2];
123 b += (__force u32)daddr->s6_addr32[3];
124 c += (__force u32)id;
125 __jhash_mix(a, b, c);
127 return c & (INETFRAGS_HASHSZ - 1);
129 EXPORT_SYMBOL_GPL(inet6_hash_frag);
131 static unsigned int ip6_hashfn(struct inet_frag_queue *q)
133 struct frag_queue *fq;
135 fq = container_of(q, struct frag_queue, q);
136 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd);
139 int ip6_frag_match(struct inet_frag_queue *q, void *a)
141 struct frag_queue *fq;
142 struct ip6_create_arg *arg = a;
144 fq = container_of(q, struct frag_queue, q);
145 return (fq->id == arg->id && fq->user == arg->user &&
146 ipv6_addr_equal(&fq->saddr, arg->src) &&
147 ipv6_addr_equal(&fq->daddr, arg->dst));
149 EXPORT_SYMBOL(ip6_frag_match);
151 /* Memory Tracking Functions. */
152 static inline void frag_kfree_skb(struct netns_frags *nf,
153 struct sk_buff *skb, int *work)
155 if (work)
156 *work -= skb->truesize;
157 atomic_sub(skb->truesize, &nf->mem);
158 kfree_skb(skb);
161 void ip6_frag_init(struct inet_frag_queue *q, void *a)
163 struct frag_queue *fq = container_of(q, struct frag_queue, q);
164 struct ip6_create_arg *arg = a;
166 fq->id = arg->id;
167 fq->user = arg->user;
168 ipv6_addr_copy(&fq->saddr, arg->src);
169 ipv6_addr_copy(&fq->daddr, arg->dst);
171 EXPORT_SYMBOL(ip6_frag_init);
173 /* Destruction primitives. */
175 static __inline__ void fq_put(struct frag_queue *fq)
177 inet_frag_put(&fq->q, &ip6_frags);
180 /* Kill fq entry. It is not destroyed immediately,
181 * because caller (and someone more) holds reference count.
183 static __inline__ void fq_kill(struct frag_queue *fq)
185 inet_frag_kill(&fq->q, &ip6_frags);
188 static void ip6_evictor(struct net *net, struct inet6_dev *idev)
190 int evicted;
192 evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
193 if (evicted)
194 IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
197 static void ip6_frag_expire(unsigned long data)
199 struct frag_queue *fq;
200 struct net_device *dev = NULL;
201 struct net *net;
203 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
205 spin_lock(&fq->q.lock);
207 if (fq->q.last_in & INET_FRAG_COMPLETE)
208 goto out;
210 fq_kill(fq);
212 net = container_of(fq->q.net, struct net, ipv6.frags);
213 dev = dev_get_by_index(net, fq->iif);
214 if (!dev)
215 goto out;
217 rcu_read_lock();
218 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
219 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
220 rcu_read_unlock();
222 /* Don't send error if the first segment did not arrive. */
223 if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
224 goto out;
227 But use as source device on which LAST ARRIVED
228 segment was received. And do not use fq->dev
229 pointer directly, device might already disappeared.
231 fq->q.fragments->dev = dev;
232 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
233 out:
234 if (dev)
235 dev_put(dev);
236 spin_unlock(&fq->q.lock);
237 fq_put(fq);
240 static __inline__ struct frag_queue *
241 fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst,
242 struct inet6_dev *idev)
244 struct inet_frag_queue *q;
245 struct ip6_create_arg arg;
246 unsigned int hash;
248 arg.id = id;
249 arg.user = IP6_DEFRAG_LOCAL_DELIVER;
250 arg.src = src;
251 arg.dst = dst;
253 read_lock(&ip6_frags.lock);
254 hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd);
256 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
257 if (q == NULL)
258 goto oom;
260 return container_of(q, struct frag_queue, q);
262 oom:
263 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS);
264 return NULL;
267 static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
268 struct frag_hdr *fhdr, int nhoff)
270 struct sk_buff *prev, *next;
271 struct net_device *dev;
272 int offset, end;
273 struct net *net = dev_net(skb_dst(skb)->dev);
275 if (fq->q.last_in & INET_FRAG_COMPLETE)
276 goto err;
278 offset = ntohs(fhdr->frag_off) & ~0x7;
279 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
280 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
282 if ((unsigned int)end > IPV6_MAXPLEN) {
283 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
284 IPSTATS_MIB_INHDRERRORS);
285 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
286 ((u8 *)&fhdr->frag_off -
287 skb_network_header(skb)));
288 return -1;
291 if (skb->ip_summed == CHECKSUM_COMPLETE) {
292 const unsigned char *nh = skb_network_header(skb);
293 skb->csum = csum_sub(skb->csum,
294 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
295 0));
298 /* Is this the final fragment? */
299 if (!(fhdr->frag_off & htons(IP6_MF))) {
300 /* If we already have some bits beyond end
301 * or have different end, the segment is corrupted.
303 if (end < fq->q.len ||
304 ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len))
305 goto err;
306 fq->q.last_in |= INET_FRAG_LAST_IN;
307 fq->q.len = end;
308 } else {
309 /* Check if the fragment is rounded to 8 bytes.
310 * Required by the RFC.
312 if (end & 0x7) {
313 /* RFC2460 says always send parameter problem in
314 * this case. -DaveM
316 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
317 IPSTATS_MIB_INHDRERRORS);
318 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
319 offsetof(struct ipv6hdr, payload_len));
320 return -1;
322 if (end > fq->q.len) {
323 /* Some bits beyond end -> corruption. */
324 if (fq->q.last_in & INET_FRAG_LAST_IN)
325 goto err;
326 fq->q.len = end;
330 if (end == offset)
331 goto err;
333 /* Point into the IP datagram 'data' part. */
334 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
335 goto err;
337 if (pskb_trim_rcsum(skb, end - offset))
338 goto err;
340 /* Find out which fragments are in front and at the back of us
341 * in the chain of fragments so far. We must know where to put
342 * this fragment, right?
344 prev = NULL;
345 for(next = fq->q.fragments; next != NULL; next = next->next) {
346 if (FRAG6_CB(next)->offset >= offset)
347 break; /* bingo! */
348 prev = next;
351 /* We found where to put this one. Check for overlap with
352 * preceding fragment, and, if needed, align things so that
353 * any overlaps are eliminated.
355 if (prev) {
356 int i = (FRAG6_CB(prev)->offset + prev->len) - offset;
358 if (i > 0) {
359 offset += i;
360 if (end <= offset)
361 goto err;
362 if (!pskb_pull(skb, i))
363 goto err;
364 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
365 skb->ip_summed = CHECKSUM_NONE;
369 /* Look for overlap with succeeding segments.
370 * If we can merge fragments, do it.
372 while (next && FRAG6_CB(next)->offset < end) {
373 int i = end - FRAG6_CB(next)->offset; /* overlap is 'i' bytes */
375 if (i < next->len) {
376 /* Eat head of the next overlapped fragment
377 * and leave the loop. The next ones cannot overlap.
379 if (!pskb_pull(next, i))
380 goto err;
381 FRAG6_CB(next)->offset += i; /* next fragment */
382 fq->q.meat -= i;
383 if (next->ip_summed != CHECKSUM_UNNECESSARY)
384 next->ip_summed = CHECKSUM_NONE;
385 break;
386 } else {
387 struct sk_buff *free_it = next;
389 /* Old fragment is completely overridden with
390 * new one drop it.
392 next = next->next;
394 if (prev)
395 prev->next = next;
396 else
397 fq->q.fragments = next;
399 fq->q.meat -= free_it->len;
400 frag_kfree_skb(fq->q.net, free_it, NULL);
404 FRAG6_CB(skb)->offset = offset;
406 /* Insert this fragment in the chain of fragments. */
407 skb->next = next;
408 if (prev)
409 prev->next = skb;
410 else
411 fq->q.fragments = skb;
413 dev = skb->dev;
414 if (dev) {
415 fq->iif = dev->ifindex;
416 skb->dev = NULL;
418 fq->q.stamp = skb->tstamp;
419 fq->q.meat += skb->len;
420 atomic_add(skb->truesize, &fq->q.net->mem);
422 /* The first fragment.
423 * nhoffset is obtained from the first fragment, of course.
425 if (offset == 0) {
426 fq->nhoffset = nhoff;
427 fq->q.last_in |= INET_FRAG_FIRST_IN;
430 if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
431 fq->q.meat == fq->q.len)
432 return ip6_frag_reasm(fq, prev, dev);
434 write_lock(&ip6_frags.lock);
435 list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
436 write_unlock(&ip6_frags.lock);
437 return -1;
439 err:
440 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
441 IPSTATS_MIB_REASMFAILS);
442 kfree_skb(skb);
443 return -1;
447 * Check if this packet is complete.
448 * Returns NULL on failure by any reason, and pointer
449 * to current nexthdr field in reassembled frame.
451 * It is called with locked fq, and caller must check that
452 * queue is eligible for reassembly i.e. it is not COMPLETE,
453 * the last and the first frames arrived and all the bits are here.
455 static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
456 struct net_device *dev)
458 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
459 struct sk_buff *fp, *head = fq->q.fragments;
460 int payload_len;
461 unsigned int nhoff;
463 fq_kill(fq);
465 /* Make the one we just received the head. */
466 if (prev) {
467 head = prev->next;
468 fp = skb_clone(head, GFP_ATOMIC);
470 if (!fp)
471 goto out_oom;
473 fp->next = head->next;
474 prev->next = fp;
476 skb_morph(head, fq->q.fragments);
477 head->next = fq->q.fragments->next;
479 kfree_skb(fq->q.fragments);
480 fq->q.fragments = head;
483 WARN_ON(head == NULL);
484 WARN_ON(FRAG6_CB(head)->offset != 0);
486 /* Unfragmented part is taken from the first segment. */
487 payload_len = ((head->data - skb_network_header(head)) -
488 sizeof(struct ipv6hdr) + fq->q.len -
489 sizeof(struct frag_hdr));
490 if (payload_len > IPV6_MAXPLEN)
491 goto out_oversize;
493 /* Head of list must not be cloned. */
494 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
495 goto out_oom;
497 /* If the first fragment is fragmented itself, we split
498 * it to two chunks: the first with data and paged part
499 * and the second, holding only fragments. */
500 if (skb_has_frags(head)) {
501 struct sk_buff *clone;
502 int i, plen = 0;
504 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
505 goto out_oom;
506 clone->next = head->next;
507 head->next = clone;
508 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
509 skb_frag_list_init(head);
510 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
511 plen += skb_shinfo(head)->frags[i].size;
512 clone->len = clone->data_len = head->data_len - plen;
513 head->data_len -= clone->len;
514 head->len -= clone->len;
515 clone->csum = 0;
516 clone->ip_summed = head->ip_summed;
517 atomic_add(clone->truesize, &fq->q.net->mem);
520 /* We have to remove fragment header from datagram and to relocate
521 * header in order to calculate ICV correctly. */
522 nhoff = fq->nhoffset;
523 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
524 memmove(head->head + sizeof(struct frag_hdr), head->head,
525 (head->data - head->head) - sizeof(struct frag_hdr));
526 head->mac_header += sizeof(struct frag_hdr);
527 head->network_header += sizeof(struct frag_hdr);
529 skb_shinfo(head)->frag_list = head->next;
530 skb_reset_transport_header(head);
531 skb_push(head, head->data - skb_network_header(head));
532 atomic_sub(head->truesize, &fq->q.net->mem);
534 for (fp=head->next; fp; fp = fp->next) {
535 head->data_len += fp->len;
536 head->len += fp->len;
537 if (head->ip_summed != fp->ip_summed)
538 head->ip_summed = CHECKSUM_NONE;
539 else if (head->ip_summed == CHECKSUM_COMPLETE)
540 head->csum = csum_add(head->csum, fp->csum);
541 head->truesize += fp->truesize;
542 atomic_sub(fp->truesize, &fq->q.net->mem);
545 head->next = NULL;
546 head->dev = dev;
547 head->tstamp = fq->q.stamp;
548 ipv6_hdr(head)->payload_len = htons(payload_len);
549 IP6CB(head)->nhoff = nhoff;
551 /* Yes, and fold redundant checksum back. 8) */
552 if (head->ip_summed == CHECKSUM_COMPLETE)
553 head->csum = csum_partial(skb_network_header(head),
554 skb_network_header_len(head),
555 head->csum);
557 rcu_read_lock();
558 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
559 rcu_read_unlock();
560 fq->q.fragments = NULL;
561 return 1;
563 out_oversize:
564 if (net_ratelimit())
565 printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len);
566 goto out_fail;
567 out_oom:
568 if (net_ratelimit())
569 printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n");
570 out_fail:
571 rcu_read_lock();
572 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
573 rcu_read_unlock();
574 return -1;
577 static int ipv6_frag_rcv(struct sk_buff *skb)
579 struct frag_hdr *fhdr;
580 struct frag_queue *fq;
581 struct ipv6hdr *hdr = ipv6_hdr(skb);
582 struct net *net = dev_net(skb_dst(skb)->dev);
584 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
586 /* Jumbo payload inhibits frag. header */
587 if (hdr->payload_len==0)
588 goto fail_hdr;
590 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
591 sizeof(struct frag_hdr))))
592 goto fail_hdr;
594 hdr = ipv6_hdr(skb);
595 fhdr = (struct frag_hdr *)skb_transport_header(skb);
597 if (!(fhdr->frag_off & htons(0xFFF9))) {
598 /* It is not a fragmented frame */
599 skb->transport_header += sizeof(struct frag_hdr);
600 IP6_INC_STATS_BH(net,
601 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
603 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
604 return 1;
607 if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
608 ip6_evictor(net, ip6_dst_idev(skb_dst(skb)));
610 if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
611 ip6_dst_idev(skb_dst(skb)))) != NULL) {
612 int ret;
614 spin_lock(&fq->q.lock);
616 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
618 spin_unlock(&fq->q.lock);
619 fq_put(fq);
620 return ret;
623 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
624 kfree_skb(skb);
625 return -1;
627 fail_hdr:
628 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
629 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
630 return -1;
633 static const struct inet6_protocol frag_protocol =
635 .handler = ipv6_frag_rcv,
636 .flags = INET6_PROTO_NOPOLICY,
639 #ifdef CONFIG_SYSCTL
640 static struct ctl_table ip6_frags_ns_ctl_table[] = {
642 .ctl_name = NET_IPV6_IP6FRAG_HIGH_THRESH,
643 .procname = "ip6frag_high_thresh",
644 .data = &init_net.ipv6.frags.high_thresh,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec
650 .ctl_name = NET_IPV6_IP6FRAG_LOW_THRESH,
651 .procname = "ip6frag_low_thresh",
652 .data = &init_net.ipv6.frags.low_thresh,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec
658 .ctl_name = NET_IPV6_IP6FRAG_TIME,
659 .procname = "ip6frag_time",
660 .data = &init_net.ipv6.frags.timeout,
661 .maxlen = sizeof(int),
662 .mode = 0644,
663 .proc_handler = proc_dointvec_jiffies,
664 .strategy = sysctl_jiffies,
669 static struct ctl_table ip6_frags_ctl_table[] = {
671 .ctl_name = NET_IPV6_IP6FRAG_SECRET_INTERVAL,
672 .procname = "ip6frag_secret_interval",
673 .data = &ip6_frags.secret_interval,
674 .maxlen = sizeof(int),
675 .mode = 0644,
676 .proc_handler = proc_dointvec_jiffies,
677 .strategy = sysctl_jiffies
682 static int ip6_frags_ns_sysctl_register(struct net *net)
684 struct ctl_table *table;
685 struct ctl_table_header *hdr;
687 table = ip6_frags_ns_ctl_table;
688 if (net != &init_net) {
689 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
690 if (table == NULL)
691 goto err_alloc;
693 table[0].data = &net->ipv6.frags.high_thresh;
694 table[1].data = &net->ipv6.frags.low_thresh;
695 table[2].data = &net->ipv6.frags.timeout;
698 hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
699 if (hdr == NULL)
700 goto err_reg;
702 net->ipv6.sysctl.frags_hdr = hdr;
703 return 0;
705 err_reg:
706 if (net != &init_net)
707 kfree(table);
708 err_alloc:
709 return -ENOMEM;
712 static void ip6_frags_ns_sysctl_unregister(struct net *net)
714 struct ctl_table *table;
716 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
717 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
718 kfree(table);
721 static struct ctl_table_header *ip6_ctl_header;
723 static int ip6_frags_sysctl_register(void)
725 ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
726 ip6_frags_ctl_table);
727 return ip6_ctl_header == NULL ? -ENOMEM : 0;
730 static void ip6_frags_sysctl_unregister(void)
732 unregister_net_sysctl_table(ip6_ctl_header);
734 #else
735 static inline int ip6_frags_ns_sysctl_register(struct net *net)
737 return 0;
740 static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
744 static inline int ip6_frags_sysctl_register(void)
746 return 0;
749 static inline void ip6_frags_sysctl_unregister(void)
752 #endif
754 static int ipv6_frags_init_net(struct net *net)
756 net->ipv6.frags.high_thresh = 256 * 1024;
757 net->ipv6.frags.low_thresh = 192 * 1024;
758 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
760 inet_frags_init_net(&net->ipv6.frags);
762 return ip6_frags_ns_sysctl_register(net);
765 static void ipv6_frags_exit_net(struct net *net)
767 ip6_frags_ns_sysctl_unregister(net);
768 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
771 static struct pernet_operations ip6_frags_ops = {
772 .init = ipv6_frags_init_net,
773 .exit = ipv6_frags_exit_net,
776 int __init ipv6_frag_init(void)
778 int ret;
780 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
781 if (ret)
782 goto out;
784 ret = ip6_frags_sysctl_register();
785 if (ret)
786 goto err_sysctl;
788 ret = register_pernet_subsys(&ip6_frags_ops);
789 if (ret)
790 goto err_pernet;
792 ip6_frags.hashfn = ip6_hashfn;
793 ip6_frags.constructor = ip6_frag_init;
794 ip6_frags.destructor = NULL;
795 ip6_frags.skb_free = NULL;
796 ip6_frags.qsize = sizeof(struct frag_queue);
797 ip6_frags.match = ip6_frag_match;
798 ip6_frags.frag_expire = ip6_frag_expire;
799 ip6_frags.secret_interval = 10 * 60 * HZ;
800 inet_frags_init(&ip6_frags);
801 out:
802 return ret;
804 err_pernet:
805 ip6_frags_sysctl_unregister();
806 err_sysctl:
807 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
808 goto out;
811 void ipv6_frag_exit(void)
813 inet_frags_fini(&ip6_frags);
814 ip6_frags_sysctl_unregister();
815 unregister_pernet_subsys(&ip6_frags_ops);
816 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);