2 * IPv6 fragment reassembly
3 * Linux INET6 implementation
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.
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{}.
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>
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>
59 struct inet6_skb_parm h
;
63 #define FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb))
67 * Equivalent of ipv4 struct ipq
72 struct inet_frag_queue q
;
74 __be32 id
; /* fragment id */
75 struct in6_addr saddr
;
76 struct in6_addr daddr
;
83 static struct inet_frags ip6_frags
;
85 int ip6_frag_nqueues(struct net
*net
)
87 return net
->ipv6
.frags
.nqueues
;
90 int ip6_frag_mem(struct net
*net
)
92 return atomic_read(&net
->ipv6
.frags
.mem
);
95 static int ip6_frag_reasm(struct frag_queue
*fq
, struct sk_buff
*prev
,
96 struct net_device
*dev
);
99 * callers should be careful not to use the hash value outside the ipfrag_lock
100 * as doing so could race with ipfrag_hash_rnd being recalculated.
102 unsigned int inet6_hash_frag(__be32 id
, const struct in6_addr
*saddr
,
103 const struct in6_addr
*daddr
, u32 rnd
)
107 a
= (__force u32
)saddr
->s6_addr32
[0];
108 b
= (__force u32
)saddr
->s6_addr32
[1];
109 c
= (__force u32
)saddr
->s6_addr32
[2];
111 a
+= JHASH_GOLDEN_RATIO
;
112 b
+= JHASH_GOLDEN_RATIO
;
114 __jhash_mix(a
, b
, c
);
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
);
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
);
126 return c
& (INETFRAGS_HASHSZ
- 1);
128 EXPORT_SYMBOL_GPL(inet6_hash_frag
);
130 static unsigned int ip6_hashfn(struct inet_frag_queue
*q
)
132 struct frag_queue
*fq
;
134 fq
= container_of(q
, struct frag_queue
, q
);
135 return inet6_hash_frag(fq
->id
, &fq
->saddr
, &fq
->daddr
, ip6_frags
.rnd
);
138 int ip6_frag_match(struct inet_frag_queue
*q
, void *a
)
140 struct frag_queue
*fq
;
141 struct ip6_create_arg
*arg
= a
;
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
));
148 EXPORT_SYMBOL(ip6_frag_match
);
150 /* Memory Tracking Functions. */
151 static inline void frag_kfree_skb(struct netns_frags
*nf
,
152 struct sk_buff
*skb
, int *work
)
155 *work
-= skb
->truesize
;
156 atomic_sub(skb
->truesize
, &nf
->mem
);
160 void ip6_frag_init(struct inet_frag_queue
*q
, void *a
)
162 struct frag_queue
*fq
= container_of(q
, struct frag_queue
, q
);
163 struct ip6_create_arg
*arg
= a
;
166 ipv6_addr_copy(&fq
->saddr
, arg
->src
);
167 ipv6_addr_copy(&fq
->daddr
, arg
->dst
);
169 EXPORT_SYMBOL(ip6_frag_init
);
171 /* Destruction primitives. */
173 static __inline__
void fq_put(struct frag_queue
*fq
)
175 inet_frag_put(&fq
->q
, &ip6_frags
);
178 /* Kill fq entry. It is not destroyed immediately,
179 * because caller (and someone more) holds reference count.
181 static __inline__
void fq_kill(struct frag_queue
*fq
)
183 inet_frag_kill(&fq
->q
, &ip6_frags
);
186 static void ip6_evictor(struct net
*net
, struct inet6_dev
*idev
)
190 evicted
= inet_frag_evictor(&net
->ipv6
.frags
, &ip6_frags
);
192 IP6_ADD_STATS_BH(net
, idev
, IPSTATS_MIB_REASMFAILS
, evicted
);
195 static void ip6_frag_expire(unsigned long data
)
197 struct frag_queue
*fq
;
198 struct net_device
*dev
= NULL
;
201 fq
= container_of((struct inet_frag_queue
*)data
, struct frag_queue
, q
);
203 spin_lock(&fq
->q
.lock
);
205 if (fq
->q
.last_in
& INET_FRAG_COMPLETE
)
210 net
= container_of(fq
->q
.net
, struct net
, ipv6
.frags
);
212 dev
= dev_get_by_index_rcu(net
, fq
->iif
);
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
);
219 /* Don't send error if the first segment did not arrive. */
220 if (!(fq
->q
.last_in
& INET_FRAG_FIRST_IN
) || !fq
->q
.fragments
)
224 But use as source device on which LAST ARRIVED
225 segment was received. And do not use fq->dev
226 pointer directly, device might already disappeared.
228 fq
->q
.fragments
->dev
= dev
;
229 icmpv6_send(fq
->q
.fragments
, ICMPV6_TIME_EXCEED
, ICMPV6_EXC_FRAGTIME
, 0, dev
);
233 spin_unlock(&fq
->q
.lock
);
237 static __inline__
struct frag_queue
*
238 fq_find(struct net
*net
, __be32 id
, struct in6_addr
*src
, struct in6_addr
*dst
,
239 struct inet6_dev
*idev
)
241 struct inet_frag_queue
*q
;
242 struct ip6_create_arg arg
;
249 read_lock(&ip6_frags
.lock
);
250 hash
= inet6_hash_frag(id
, src
, dst
, ip6_frags
.rnd
);
252 q
= inet_frag_find(&net
->ipv6
.frags
, &ip6_frags
, &arg
, hash
);
256 return container_of(q
, struct frag_queue
, q
);
259 IP6_INC_STATS_BH(net
, idev
, IPSTATS_MIB_REASMFAILS
);
263 static int ip6_frag_queue(struct frag_queue
*fq
, struct sk_buff
*skb
,
264 struct frag_hdr
*fhdr
, int nhoff
)
266 struct sk_buff
*prev
, *next
;
267 struct net_device
*dev
;
269 struct net
*net
= dev_net(skb_dst(skb
)->dev
);
271 if (fq
->q
.last_in
& INET_FRAG_COMPLETE
)
274 offset
= ntohs(fhdr
->frag_off
) & ~0x7;
275 end
= offset
+ (ntohs(ipv6_hdr(skb
)->payload_len
) -
276 ((u8
*)(fhdr
+ 1) - (u8
*)(ipv6_hdr(skb
) + 1)));
278 if ((unsigned int)end
> IPV6_MAXPLEN
) {
279 IP6_INC_STATS_BH(net
, ip6_dst_idev(skb_dst(skb
)),
280 IPSTATS_MIB_INHDRERRORS
);
281 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
,
282 ((u8
*)&fhdr
->frag_off
-
283 skb_network_header(skb
)));
287 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
288 const unsigned char *nh
= skb_network_header(skb
);
289 skb
->csum
= csum_sub(skb
->csum
,
290 csum_partial(nh
, (u8
*)(fhdr
+ 1) - nh
,
294 /* Is this the final fragment? */
295 if (!(fhdr
->frag_off
& htons(IP6_MF
))) {
296 /* If we already have some bits beyond end
297 * or have different end, the segment is corrupted.
299 if (end
< fq
->q
.len
||
300 ((fq
->q
.last_in
& INET_FRAG_LAST_IN
) && end
!= fq
->q
.len
))
302 fq
->q
.last_in
|= INET_FRAG_LAST_IN
;
305 /* Check if the fragment is rounded to 8 bytes.
306 * Required by the RFC.
309 /* RFC2460 says always send parameter problem in
312 IP6_INC_STATS_BH(net
, ip6_dst_idev(skb_dst(skb
)),
313 IPSTATS_MIB_INHDRERRORS
);
314 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
,
315 offsetof(struct ipv6hdr
, payload_len
));
318 if (end
> fq
->q
.len
) {
319 /* Some bits beyond end -> corruption. */
320 if (fq
->q
.last_in
& INET_FRAG_LAST_IN
)
329 /* Point into the IP datagram 'data' part. */
330 if (!pskb_pull(skb
, (u8
*) (fhdr
+ 1) - skb
->data
))
333 if (pskb_trim_rcsum(skb
, end
- offset
))
336 /* Find out which fragments are in front and at the back of us
337 * in the chain of fragments so far. We must know where to put
338 * this fragment, right?
341 for(next
= fq
->q
.fragments
; next
!= NULL
; next
= next
->next
) {
342 if (FRAG6_CB(next
)->offset
>= offset
)
347 /* We found where to put this one. Check for overlap with
348 * preceding fragment, and, if needed, align things so that
349 * any overlaps are eliminated.
352 int i
= (FRAG6_CB(prev
)->offset
+ prev
->len
) - offset
;
358 if (!pskb_pull(skb
, i
))
360 if (skb
->ip_summed
!= CHECKSUM_UNNECESSARY
)
361 skb
->ip_summed
= CHECKSUM_NONE
;
365 /* Look for overlap with succeeding segments.
366 * If we can merge fragments, do it.
368 while (next
&& FRAG6_CB(next
)->offset
< end
) {
369 int i
= end
- FRAG6_CB(next
)->offset
; /* overlap is 'i' bytes */
372 /* Eat head of the next overlapped fragment
373 * and leave the loop. The next ones cannot overlap.
375 if (!pskb_pull(next
, i
))
377 FRAG6_CB(next
)->offset
+= i
; /* next fragment */
379 if (next
->ip_summed
!= CHECKSUM_UNNECESSARY
)
380 next
->ip_summed
= CHECKSUM_NONE
;
383 struct sk_buff
*free_it
= next
;
385 /* Old fragment is completely overridden with
393 fq
->q
.fragments
= next
;
395 fq
->q
.meat
-= free_it
->len
;
396 frag_kfree_skb(fq
->q
.net
, free_it
, NULL
);
400 FRAG6_CB(skb
)->offset
= offset
;
402 /* Insert this fragment in the chain of fragments. */
407 fq
->q
.fragments
= skb
;
411 fq
->iif
= dev
->ifindex
;
414 fq
->q
.stamp
= skb
->tstamp
;
415 fq
->q
.meat
+= skb
->len
;
416 atomic_add(skb
->truesize
, &fq
->q
.net
->mem
);
418 /* The first fragment.
419 * nhoffset is obtained from the first fragment, of course.
422 fq
->nhoffset
= nhoff
;
423 fq
->q
.last_in
|= INET_FRAG_FIRST_IN
;
426 if (fq
->q
.last_in
== (INET_FRAG_FIRST_IN
| INET_FRAG_LAST_IN
) &&
427 fq
->q
.meat
== fq
->q
.len
)
428 return ip6_frag_reasm(fq
, prev
, dev
);
430 write_lock(&ip6_frags
.lock
);
431 list_move_tail(&fq
->q
.lru_list
, &fq
->q
.net
->lru_list
);
432 write_unlock(&ip6_frags
.lock
);
436 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
437 IPSTATS_MIB_REASMFAILS
);
443 * Check if this packet is complete.
444 * Returns NULL on failure by any reason, and pointer
445 * to current nexthdr field in reassembled frame.
447 * It is called with locked fq, and caller must check that
448 * queue is eligible for reassembly i.e. it is not COMPLETE,
449 * the last and the first frames arrived and all the bits are here.
451 static int ip6_frag_reasm(struct frag_queue
*fq
, struct sk_buff
*prev
,
452 struct net_device
*dev
)
454 struct net
*net
= container_of(fq
->q
.net
, struct net
, ipv6
.frags
);
455 struct sk_buff
*fp
, *head
= fq
->q
.fragments
;
461 /* Make the one we just received the head. */
464 fp
= skb_clone(head
, GFP_ATOMIC
);
469 fp
->next
= head
->next
;
472 skb_morph(head
, fq
->q
.fragments
);
473 head
->next
= fq
->q
.fragments
->next
;
475 kfree_skb(fq
->q
.fragments
);
476 fq
->q
.fragments
= head
;
479 WARN_ON(head
== NULL
);
480 WARN_ON(FRAG6_CB(head
)->offset
!= 0);
482 /* Unfragmented part is taken from the first segment. */
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
)
489 /* Head of list must not be cloned. */
490 if (skb_cloned(head
) && pskb_expand_head(head
, 0, 0, GFP_ATOMIC
))
493 /* If the first fragment is fragmented itself, we split
494 * it to two chunks: the first with data and paged part
495 * and the second, holding only fragments. */
496 if (skb_has_frags(head
)) {
497 struct sk_buff
*clone
;
500 if ((clone
= alloc_skb(0, GFP_ATOMIC
)) == NULL
)
502 clone
->next
= head
->next
;
504 skb_shinfo(clone
)->frag_list
= skb_shinfo(head
)->frag_list
;
505 skb_frag_list_init(head
);
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
;
512 clone
->ip_summed
= head
->ip_summed
;
513 atomic_add(clone
->truesize
, &fq
->q
.net
->mem
);
516 /* We have to remove fragment header from datagram and to relocate
517 * header in order to calculate ICV correctly. */
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
);
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
);
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
);
543 head
->tstamp
= fq
->q
.stamp
;
544 ipv6_hdr(head
)->payload_len
= htons(payload_len
);
545 IP6CB(head
)->nhoff
= nhoff
;
547 /* Yes, and fold redundant checksum back. 8) */
548 if (head
->ip_summed
== CHECKSUM_COMPLETE
)
549 head
->csum
= csum_partial(skb_network_header(head
),
550 skb_network_header_len(head
),
554 IP6_INC_STATS_BH(net
, __in6_dev_get(dev
), IPSTATS_MIB_REASMOKS
);
556 fq
->q
.fragments
= NULL
;
561 printk(KERN_DEBUG
"ip6_frag_reasm: payload len = %d\n", payload_len
);
565 printk(KERN_DEBUG
"ip6_frag_reasm: no memory for reassembly\n");
568 IP6_INC_STATS_BH(net
, __in6_dev_get(dev
), IPSTATS_MIB_REASMFAILS
);
573 static int ipv6_frag_rcv(struct sk_buff
*skb
)
575 struct frag_hdr
*fhdr
;
576 struct frag_queue
*fq
;
577 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
578 struct net
*net
= dev_net(skb_dst(skb
)->dev
);
580 IP6_INC_STATS_BH(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_REASMREQDS
);
582 /* Jumbo payload inhibits frag. header */
583 if (hdr
->payload_len
==0)
586 if (!pskb_may_pull(skb
, (skb_transport_offset(skb
) +
587 sizeof(struct frag_hdr
))))
591 fhdr
= (struct frag_hdr
*)skb_transport_header(skb
);
593 if (!(fhdr
->frag_off
& htons(0xFFF9))) {
594 /* It is not a fragmented frame */
595 skb
->transport_header
+= sizeof(struct frag_hdr
);
596 IP6_INC_STATS_BH(net
,
597 ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_REASMOKS
);
599 IP6CB(skb
)->nhoff
= (u8
*)fhdr
- skb_network_header(skb
);
603 if (atomic_read(&net
->ipv6
.frags
.mem
) > net
->ipv6
.frags
.high_thresh
)
604 ip6_evictor(net
, ip6_dst_idev(skb_dst(skb
)));
606 if ((fq
= fq_find(net
, fhdr
->identification
, &hdr
->saddr
, &hdr
->daddr
,
607 ip6_dst_idev(skb_dst(skb
)))) != NULL
) {
610 spin_lock(&fq
->q
.lock
);
612 ret
= ip6_frag_queue(fq
, skb
, fhdr
, IP6CB(skb
)->nhoff
);
614 spin_unlock(&fq
->q
.lock
);
619 IP6_INC_STATS_BH(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_REASMFAILS
);
624 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_INHDRERRORS
);
625 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
, skb_network_header_len(skb
));
629 static const struct inet6_protocol frag_protocol
=
631 .handler
= ipv6_frag_rcv
,
632 .flags
= INET6_PROTO_NOPOLICY
,
636 static struct ctl_table ip6_frags_ns_ctl_table
[] = {
638 .procname
= "ip6frag_high_thresh",
639 .data
= &init_net
.ipv6
.frags
.high_thresh
,
640 .maxlen
= sizeof(int),
642 .proc_handler
= proc_dointvec
645 .procname
= "ip6frag_low_thresh",
646 .data
= &init_net
.ipv6
.frags
.low_thresh
,
647 .maxlen
= sizeof(int),
649 .proc_handler
= proc_dointvec
652 .procname
= "ip6frag_time",
653 .data
= &init_net
.ipv6
.frags
.timeout
,
654 .maxlen
= sizeof(int),
656 .proc_handler
= proc_dointvec_jiffies
,
661 static struct ctl_table ip6_frags_ctl_table
[] = {
663 .procname
= "ip6frag_secret_interval",
664 .data
= &ip6_frags
.secret_interval
,
665 .maxlen
= sizeof(int),
667 .proc_handler
= proc_dointvec_jiffies
,
672 static int ip6_frags_ns_sysctl_register(struct net
*net
)
674 struct ctl_table
*table
;
675 struct ctl_table_header
*hdr
;
677 table
= ip6_frags_ns_ctl_table
;
678 if (!net_eq(net
, &init_net
)) {
679 table
= kmemdup(table
, sizeof(ip6_frags_ns_ctl_table
), GFP_KERNEL
);
683 table
[0].data
= &net
->ipv6
.frags
.high_thresh
;
684 table
[1].data
= &net
->ipv6
.frags
.low_thresh
;
685 table
[2].data
= &net
->ipv6
.frags
.timeout
;
688 hdr
= register_net_sysctl_table(net
, net_ipv6_ctl_path
, table
);
692 net
->ipv6
.sysctl
.frags_hdr
= hdr
;
696 if (!net_eq(net
, &init_net
))
702 static void ip6_frags_ns_sysctl_unregister(struct net
*net
)
704 struct ctl_table
*table
;
706 table
= net
->ipv6
.sysctl
.frags_hdr
->ctl_table_arg
;
707 unregister_net_sysctl_table(net
->ipv6
.sysctl
.frags_hdr
);
711 static struct ctl_table_header
*ip6_ctl_header
;
713 static int ip6_frags_sysctl_register(void)
715 ip6_ctl_header
= register_net_sysctl_rotable(net_ipv6_ctl_path
,
716 ip6_frags_ctl_table
);
717 return ip6_ctl_header
== NULL
? -ENOMEM
: 0;
720 static void ip6_frags_sysctl_unregister(void)
722 unregister_net_sysctl_table(ip6_ctl_header
);
725 static inline int ip6_frags_ns_sysctl_register(struct net
*net
)
730 static inline void ip6_frags_ns_sysctl_unregister(struct net
*net
)
734 static inline int ip6_frags_sysctl_register(void)
739 static inline void ip6_frags_sysctl_unregister(void)
744 static int ipv6_frags_init_net(struct net
*net
)
746 net
->ipv6
.frags
.high_thresh
= 256 * 1024;
747 net
->ipv6
.frags
.low_thresh
= 192 * 1024;
748 net
->ipv6
.frags
.timeout
= IPV6_FRAG_TIMEOUT
;
750 inet_frags_init_net(&net
->ipv6
.frags
);
752 return ip6_frags_ns_sysctl_register(net
);
755 static void ipv6_frags_exit_net(struct net
*net
)
757 ip6_frags_ns_sysctl_unregister(net
);
758 inet_frags_exit_net(&net
->ipv6
.frags
, &ip6_frags
);
761 static struct pernet_operations ip6_frags_ops
= {
762 .init
= ipv6_frags_init_net
,
763 .exit
= ipv6_frags_exit_net
,
766 int __init
ipv6_frag_init(void)
770 ret
= inet6_add_protocol(&frag_protocol
, IPPROTO_FRAGMENT
);
774 ret
= ip6_frags_sysctl_register();
778 ret
= register_pernet_subsys(&ip6_frags_ops
);
782 ip6_frags
.hashfn
= ip6_hashfn
;
783 ip6_frags
.constructor
= ip6_frag_init
;
784 ip6_frags
.destructor
= NULL
;
785 ip6_frags
.skb_free
= NULL
;
786 ip6_frags
.qsize
= sizeof(struct frag_queue
);
787 ip6_frags
.match
= ip6_frag_match
;
788 ip6_frags
.frag_expire
= ip6_frag_expire
;
789 ip6_frags
.secret_interval
= 10 * 60 * HZ
;
790 inet_frags_init(&ip6_frags
);
795 ip6_frags_sysctl_unregister();
797 inet6_del_protocol(&frag_protocol
, IPPROTO_FRAGMENT
);
801 void ipv6_frag_exit(void)
803 inet_frags_fini(&ip6_frags
);
804 ip6_frags_sysctl_unregister();
805 unregister_pernet_subsys(&ip6_frags_ops
);
806 inet6_del_protocol(&frag_protocol
, IPPROTO_FRAGMENT
);