2 * IPv6 fragment reassembly
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * $Id: reassembly.c,v 1.26 2001/03/07 22:00:57 davem Exp $
10 * Based on: net/ipv4/ip_fragment.c
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
20 * Andi Kleen Make it work with multiple hosts.
21 * More RFC compliance.
23 * Horst von Brand Add missing #include <linux/string.h>
24 * Alexey Kuznetsov SMP races, threading, cleanup.
25 * Patrick McHardy LRU queue of frag heads for evictor.
26 * Mitsuru KANDA @USAGI Register inet6_protocol{}.
28 * YOSHIFUJI,H. @USAGI Always remove fragment header to
29 * calculate ICV correctly.
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/jiffies.h>
37 #include <linux/net.h>
38 #include <linux/list.h>
39 #include <linux/netdevice.h>
40 #include <linux/in6.h>
41 #include <linux/ipv6.h>
42 #include <linux/icmpv6.h>
43 #include <linux/random.h>
44 #include <linux/jhash.h>
45 #include <linux/skbuff.h>
51 #include <net/ip6_route.h>
52 #include <net/protocol.h>
53 #include <net/transp_v6.h>
54 #include <net/rawv6.h>
55 #include <net/ndisc.h>
56 #include <net/addrconf.h>
58 int sysctl_ip6frag_high_thresh __read_mostly
= 256*1024;
59 int sysctl_ip6frag_low_thresh __read_mostly
= 192*1024;
61 int sysctl_ip6frag_time __read_mostly
= IPV6_FRAG_TIMEOUT
;
65 struct inet6_skb_parm h
;
69 #define FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb))
73 * Equivalent of ipv4 struct ipq
78 struct hlist_node list
;
79 struct list_head lru_list
; /* lru list member */
81 __be32 id
; /* fragment id */
82 struct in6_addr saddr
;
83 struct in6_addr daddr
;
87 struct timer_list timer
; /* expire timer */
88 struct sk_buff
*fragments
;
94 __u8 last_in
; /* has first/last segment arrived? */
103 #define IP6Q_HASHSZ 64
105 static struct hlist_head ip6_frag_hash
[IP6Q_HASHSZ
];
106 static DEFINE_RWLOCK(ip6_frag_lock
);
107 static u32 ip6_frag_hash_rnd
;
108 static LIST_HEAD(ip6_frag_lru_list
);
109 int ip6_frag_nqueues
= 0;
111 static int ip6_frag_reasm(struct frag_queue
*fq
, struct sk_buff
*prev
,
112 struct net_device
*dev
);
114 static __inline__
void __fq_unlink(struct frag_queue
*fq
)
116 hlist_del(&fq
->list
);
117 list_del(&fq
->lru_list
);
121 static __inline__
void fq_unlink(struct frag_queue
*fq
)
123 write_lock(&ip6_frag_lock
);
125 write_unlock(&ip6_frag_lock
);
129 * callers should be careful not to use the hash value outside the ipfrag_lock
130 * as doing so could race with ipfrag_hash_rnd being recalculated.
132 static unsigned int ip6qhashfn(__be32 id
, struct in6_addr
*saddr
,
133 struct in6_addr
*daddr
)
137 a
= (__force u32
)saddr
->s6_addr32
[0];
138 b
= (__force u32
)saddr
->s6_addr32
[1];
139 c
= (__force u32
)saddr
->s6_addr32
[2];
141 a
+= JHASH_GOLDEN_RATIO
;
142 b
+= JHASH_GOLDEN_RATIO
;
143 c
+= ip6_frag_hash_rnd
;
144 __jhash_mix(a
, b
, c
);
146 a
+= (__force u32
)saddr
->s6_addr32
[3];
147 b
+= (__force u32
)daddr
->s6_addr32
[0];
148 c
+= (__force u32
)daddr
->s6_addr32
[1];
149 __jhash_mix(a
, b
, c
);
151 a
+= (__force u32
)daddr
->s6_addr32
[2];
152 b
+= (__force u32
)daddr
->s6_addr32
[3];
153 c
+= (__force u32
)id
;
154 __jhash_mix(a
, b
, c
);
156 return c
& (IP6Q_HASHSZ
- 1);
159 static struct timer_list ip6_frag_secret_timer
;
160 int sysctl_ip6frag_secret_interval __read_mostly
= 10 * 60 * HZ
;
162 static void ip6_frag_secret_rebuild(unsigned long dummy
)
164 unsigned long now
= jiffies
;
167 write_lock(&ip6_frag_lock
);
168 get_random_bytes(&ip6_frag_hash_rnd
, sizeof(u32
));
169 for (i
= 0; i
< IP6Q_HASHSZ
; i
++) {
170 struct frag_queue
*q
;
171 struct hlist_node
*p
, *n
;
173 hlist_for_each_entry_safe(q
, p
, n
, &ip6_frag_hash
[i
], list
) {
174 unsigned int hval
= ip6qhashfn(q
->id
,
181 /* Relink to new hash chain. */
182 hlist_add_head(&q
->list
,
183 &ip6_frag_hash
[hval
]);
188 write_unlock(&ip6_frag_lock
);
190 mod_timer(&ip6_frag_secret_timer
, now
+ sysctl_ip6frag_secret_interval
);
193 atomic_t ip6_frag_mem
= ATOMIC_INIT(0);
195 /* Memory Tracking Functions. */
196 static inline void frag_kfree_skb(struct sk_buff
*skb
, int *work
)
199 *work
-= skb
->truesize
;
200 atomic_sub(skb
->truesize
, &ip6_frag_mem
);
204 static inline void frag_free_queue(struct frag_queue
*fq
, int *work
)
207 *work
-= sizeof(struct frag_queue
);
208 atomic_sub(sizeof(struct frag_queue
), &ip6_frag_mem
);
212 static inline struct frag_queue
*frag_alloc_queue(void)
214 struct frag_queue
*fq
= kzalloc(sizeof(struct frag_queue
), GFP_ATOMIC
);
218 atomic_add(sizeof(struct frag_queue
), &ip6_frag_mem
);
222 /* Destruction primitives. */
224 /* Complete destruction of fq. */
225 static void ip6_frag_destroy(struct frag_queue
*fq
, int *work
)
229 BUG_TRAP(fq
->last_in
&COMPLETE
);
230 BUG_TRAP(del_timer(&fq
->timer
) == 0);
232 /* Release all fragment data. */
235 struct sk_buff
*xp
= fp
->next
;
237 frag_kfree_skb(fp
, work
);
241 frag_free_queue(fq
, work
);
244 static __inline__
void fq_put(struct frag_queue
*fq
, int *work
)
246 if (atomic_dec_and_test(&fq
->refcnt
))
247 ip6_frag_destroy(fq
, work
);
250 /* Kill fq entry. It is not destroyed immediately,
251 * because caller (and someone more) holds reference count.
253 static __inline__
void fq_kill(struct frag_queue
*fq
)
255 if (del_timer(&fq
->timer
))
256 atomic_dec(&fq
->refcnt
);
258 if (!(fq
->last_in
& COMPLETE
)) {
260 atomic_dec(&fq
->refcnt
);
261 fq
->last_in
|= COMPLETE
;
265 static void ip6_evictor(struct inet6_dev
*idev
)
267 struct frag_queue
*fq
;
268 struct list_head
*tmp
;
271 work
= atomic_read(&ip6_frag_mem
) - sysctl_ip6frag_low_thresh
;
276 read_lock(&ip6_frag_lock
);
277 if (list_empty(&ip6_frag_lru_list
)) {
278 read_unlock(&ip6_frag_lock
);
281 tmp
= ip6_frag_lru_list
.next
;
282 fq
= list_entry(tmp
, struct frag_queue
, lru_list
);
283 atomic_inc(&fq
->refcnt
);
284 read_unlock(&ip6_frag_lock
);
286 spin_lock(&fq
->lock
);
287 if (!(fq
->last_in
&COMPLETE
))
289 spin_unlock(&fq
->lock
);
292 IP6_INC_STATS_BH(idev
, IPSTATS_MIB_REASMFAILS
);
296 static void ip6_frag_expire(unsigned long data
)
298 struct frag_queue
*fq
= (struct frag_queue
*) data
;
299 struct net_device
*dev
= NULL
;
301 spin_lock(&fq
->lock
);
303 if (fq
->last_in
& COMPLETE
)
308 dev
= dev_get_by_index(&init_net
, fq
->iif
);
313 IP6_INC_STATS_BH(__in6_dev_get(dev
), IPSTATS_MIB_REASMTIMEOUT
);
314 IP6_INC_STATS_BH(__in6_dev_get(dev
), IPSTATS_MIB_REASMFAILS
);
317 /* Don't send error if the first segment did not arrive. */
318 if (!(fq
->last_in
&FIRST_IN
) || !fq
->fragments
)
322 But use as source device on which LAST ARRIVED
323 segment was received. And do not use fq->dev
324 pointer directly, device might already disappeared.
326 fq
->fragments
->dev
= dev
;
327 icmpv6_send(fq
->fragments
, ICMPV6_TIME_EXCEED
, ICMPV6_EXC_FRAGTIME
, 0, dev
);
331 spin_unlock(&fq
->lock
);
335 /* Creation primitives. */
338 static struct frag_queue
*ip6_frag_intern(struct frag_queue
*fq_in
)
340 struct frag_queue
*fq
;
343 struct hlist_node
*n
;
346 write_lock(&ip6_frag_lock
);
347 hash
= ip6qhashfn(fq_in
->id
, &fq_in
->saddr
, &fq_in
->daddr
);
349 hlist_for_each_entry(fq
, n
, &ip6_frag_hash
[hash
], list
) {
350 if (fq
->id
== fq_in
->id
&&
351 ipv6_addr_equal(&fq_in
->saddr
, &fq
->saddr
) &&
352 ipv6_addr_equal(&fq_in
->daddr
, &fq
->daddr
)) {
353 atomic_inc(&fq
->refcnt
);
354 write_unlock(&ip6_frag_lock
);
355 fq_in
->last_in
|= COMPLETE
;
363 if (!mod_timer(&fq
->timer
, jiffies
+ sysctl_ip6frag_time
))
364 atomic_inc(&fq
->refcnt
);
366 atomic_inc(&fq
->refcnt
);
367 hlist_add_head(&fq
->list
, &ip6_frag_hash
[hash
]);
368 INIT_LIST_HEAD(&fq
->lru_list
);
369 list_add_tail(&fq
->lru_list
, &ip6_frag_lru_list
);
371 write_unlock(&ip6_frag_lock
);
376 static struct frag_queue
*
377 ip6_frag_create(__be32 id
, struct in6_addr
*src
, struct in6_addr
*dst
,
378 struct inet6_dev
*idev
)
380 struct frag_queue
*fq
;
382 if ((fq
= frag_alloc_queue()) == NULL
)
386 ipv6_addr_copy(&fq
->saddr
, src
);
387 ipv6_addr_copy(&fq
->daddr
, dst
);
389 init_timer(&fq
->timer
);
390 fq
->timer
.function
= ip6_frag_expire
;
391 fq
->timer
.data
= (long) fq
;
392 spin_lock_init(&fq
->lock
);
393 atomic_set(&fq
->refcnt
, 1);
395 return ip6_frag_intern(fq
);
398 IP6_INC_STATS_BH(idev
, IPSTATS_MIB_REASMFAILS
);
402 static __inline__
struct frag_queue
*
403 fq_find(__be32 id
, struct in6_addr
*src
, struct in6_addr
*dst
,
404 struct inet6_dev
*idev
)
406 struct frag_queue
*fq
;
407 struct hlist_node
*n
;
410 read_lock(&ip6_frag_lock
);
411 hash
= ip6qhashfn(id
, src
, dst
);
412 hlist_for_each_entry(fq
, n
, &ip6_frag_hash
[hash
], list
) {
414 ipv6_addr_equal(src
, &fq
->saddr
) &&
415 ipv6_addr_equal(dst
, &fq
->daddr
)) {
416 atomic_inc(&fq
->refcnt
);
417 read_unlock(&ip6_frag_lock
);
421 read_unlock(&ip6_frag_lock
);
423 return ip6_frag_create(id
, src
, dst
, idev
);
427 static int ip6_frag_queue(struct frag_queue
*fq
, struct sk_buff
*skb
,
428 struct frag_hdr
*fhdr
, int nhoff
)
430 struct sk_buff
*prev
, *next
;
431 struct net_device
*dev
;
434 if (fq
->last_in
& COMPLETE
)
437 offset
= ntohs(fhdr
->frag_off
) & ~0x7;
438 end
= offset
+ (ntohs(ipv6_hdr(skb
)->payload_len
) -
439 ((u8
*)(fhdr
+ 1) - (u8
*)(ipv6_hdr(skb
) + 1)));
441 if ((unsigned int)end
> IPV6_MAXPLEN
) {
442 IP6_INC_STATS_BH(ip6_dst_idev(skb
->dst
),
443 IPSTATS_MIB_INHDRERRORS
);
444 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
,
445 ((u8
*)&fhdr
->frag_off
-
446 skb_network_header(skb
)));
450 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
451 const unsigned char *nh
= skb_network_header(skb
);
452 skb
->csum
= csum_sub(skb
->csum
,
453 csum_partial(nh
, (u8
*)(fhdr
+ 1) - nh
,
457 /* Is this the final fragment? */
458 if (!(fhdr
->frag_off
& htons(IP6_MF
))) {
459 /* If we already have some bits beyond end
460 * or have different end, the segment is corrupted.
463 ((fq
->last_in
& LAST_IN
) && end
!= fq
->len
))
465 fq
->last_in
|= LAST_IN
;
468 /* Check if the fragment is rounded to 8 bytes.
469 * Required by the RFC.
472 /* RFC2460 says always send parameter problem in
475 IP6_INC_STATS_BH(ip6_dst_idev(skb
->dst
),
476 IPSTATS_MIB_INHDRERRORS
);
477 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
,
478 offsetof(struct ipv6hdr
, payload_len
));
482 /* Some bits beyond end -> corruption. */
483 if (fq
->last_in
& LAST_IN
)
492 /* Point into the IP datagram 'data' part. */
493 if (!pskb_pull(skb
, (u8
*) (fhdr
+ 1) - skb
->data
))
496 if (pskb_trim_rcsum(skb
, end
- offset
))
499 /* Find out which fragments are in front and at the back of us
500 * in the chain of fragments so far. We must know where to put
501 * this fragment, right?
504 for(next
= fq
->fragments
; next
!= NULL
; next
= next
->next
) {
505 if (FRAG6_CB(next
)->offset
>= offset
)
510 /* We found where to put this one. Check for overlap with
511 * preceding fragment, and, if needed, align things so that
512 * any overlaps are eliminated.
515 int i
= (FRAG6_CB(prev
)->offset
+ prev
->len
) - offset
;
521 if (!pskb_pull(skb
, i
))
523 if (skb
->ip_summed
!= CHECKSUM_UNNECESSARY
)
524 skb
->ip_summed
= CHECKSUM_NONE
;
528 /* Look for overlap with succeeding segments.
529 * If we can merge fragments, do it.
531 while (next
&& FRAG6_CB(next
)->offset
< end
) {
532 int i
= end
- FRAG6_CB(next
)->offset
; /* overlap is 'i' bytes */
535 /* Eat head of the next overlapped fragment
536 * and leave the loop. The next ones cannot overlap.
538 if (!pskb_pull(next
, i
))
540 FRAG6_CB(next
)->offset
+= i
; /* next fragment */
542 if (next
->ip_summed
!= CHECKSUM_UNNECESSARY
)
543 next
->ip_summed
= CHECKSUM_NONE
;
546 struct sk_buff
*free_it
= next
;
548 /* Old fragment is completely overridden with
556 fq
->fragments
= next
;
558 fq
->meat
-= free_it
->len
;
559 frag_kfree_skb(free_it
, NULL
);
563 FRAG6_CB(skb
)->offset
= offset
;
565 /* Insert this fragment in the chain of fragments. */
574 fq
->iif
= dev
->ifindex
;
577 fq
->stamp
= skb
->tstamp
;
578 fq
->meat
+= skb
->len
;
579 atomic_add(skb
->truesize
, &ip6_frag_mem
);
581 /* The first fragment.
582 * nhoffset is obtained from the first fragment, of course.
585 fq
->nhoffset
= nhoff
;
586 fq
->last_in
|= FIRST_IN
;
589 if (fq
->last_in
== (FIRST_IN
| LAST_IN
) && fq
->meat
== fq
->len
)
590 return ip6_frag_reasm(fq
, prev
, dev
);
592 write_lock(&ip6_frag_lock
);
593 list_move_tail(&fq
->lru_list
, &ip6_frag_lru_list
);
594 write_unlock(&ip6_frag_lock
);
598 IP6_INC_STATS(ip6_dst_idev(skb
->dst
), IPSTATS_MIB_REASMFAILS
);
604 * Check if this packet is complete.
605 * Returns NULL on failure by any reason, and pointer
606 * to current nexthdr field in reassembled frame.
608 * It is called with locked fq, and caller must check that
609 * queue is eligible for reassembly i.e. it is not COMPLETE,
610 * the last and the first frames arrived and all the bits are here.
612 static int ip6_frag_reasm(struct frag_queue
*fq
, struct sk_buff
*prev
,
613 struct net_device
*dev
)
615 struct sk_buff
*fp
, *head
= fq
->fragments
;
621 /* Make the one we just received the head. */
624 fp
= skb_clone(head
, GFP_ATOMIC
);
629 fp
->next
= head
->next
;
632 skb_morph(head
, fq
->fragments
);
633 head
->next
= fq
->fragments
->next
;
635 kfree_skb(fq
->fragments
);
636 fq
->fragments
= head
;
639 BUG_TRAP(head
!= NULL
);
640 BUG_TRAP(FRAG6_CB(head
)->offset
== 0);
642 /* Unfragmented part is taken from the first segment. */
643 payload_len
= ((head
->data
- skb_network_header(head
)) -
644 sizeof(struct ipv6hdr
) + fq
->len
-
645 sizeof(struct frag_hdr
));
646 if (payload_len
> IPV6_MAXPLEN
)
649 /* Head of list must not be cloned. */
650 if (skb_cloned(head
) && pskb_expand_head(head
, 0, 0, GFP_ATOMIC
))
653 /* If the first fragment is fragmented itself, we split
654 * it to two chunks: the first with data and paged part
655 * and the second, holding only fragments. */
656 if (skb_shinfo(head
)->frag_list
) {
657 struct sk_buff
*clone
;
660 if ((clone
= alloc_skb(0, GFP_ATOMIC
)) == NULL
)
662 clone
->next
= head
->next
;
664 skb_shinfo(clone
)->frag_list
= skb_shinfo(head
)->frag_list
;
665 skb_shinfo(head
)->frag_list
= NULL
;
666 for (i
=0; i
<skb_shinfo(head
)->nr_frags
; i
++)
667 plen
+= skb_shinfo(head
)->frags
[i
].size
;
668 clone
->len
= clone
->data_len
= head
->data_len
- plen
;
669 head
->data_len
-= clone
->len
;
670 head
->len
-= clone
->len
;
672 clone
->ip_summed
= head
->ip_summed
;
673 atomic_add(clone
->truesize
, &ip6_frag_mem
);
676 /* We have to remove fragment header from datagram and to relocate
677 * header in order to calculate ICV correctly. */
678 nhoff
= fq
->nhoffset
;
679 skb_network_header(head
)[nhoff
] = skb_transport_header(head
)[0];
680 memmove(head
->head
+ sizeof(struct frag_hdr
), head
->head
,
681 (head
->data
- head
->head
) - sizeof(struct frag_hdr
));
682 head
->mac_header
+= sizeof(struct frag_hdr
);
683 head
->network_header
+= sizeof(struct frag_hdr
);
685 skb_shinfo(head
)->frag_list
= head
->next
;
686 skb_reset_transport_header(head
);
687 skb_push(head
, head
->data
- skb_network_header(head
));
688 atomic_sub(head
->truesize
, &ip6_frag_mem
);
690 for (fp
=head
->next
; fp
; fp
= fp
->next
) {
691 head
->data_len
+= fp
->len
;
692 head
->len
+= fp
->len
;
693 if (head
->ip_summed
!= fp
->ip_summed
)
694 head
->ip_summed
= CHECKSUM_NONE
;
695 else if (head
->ip_summed
== CHECKSUM_COMPLETE
)
696 head
->csum
= csum_add(head
->csum
, fp
->csum
);
697 head
->truesize
+= fp
->truesize
;
698 atomic_sub(fp
->truesize
, &ip6_frag_mem
);
703 head
->tstamp
= fq
->stamp
;
704 ipv6_hdr(head
)->payload_len
= htons(payload_len
);
705 IP6CB(head
)->nhoff
= nhoff
;
707 /* Yes, and fold redundant checksum back. 8) */
708 if (head
->ip_summed
== CHECKSUM_COMPLETE
)
709 head
->csum
= csum_partial(skb_network_header(head
),
710 skb_network_header_len(head
),
714 IP6_INC_STATS_BH(__in6_dev_get(dev
), IPSTATS_MIB_REASMOKS
);
716 fq
->fragments
= NULL
;
721 printk(KERN_DEBUG
"ip6_frag_reasm: payload len = %d\n", payload_len
);
725 printk(KERN_DEBUG
"ip6_frag_reasm: no memory for reassembly\n");
728 IP6_INC_STATS_BH(__in6_dev_get(dev
), IPSTATS_MIB_REASMFAILS
);
733 static int ipv6_frag_rcv(struct sk_buff
**skbp
)
735 struct sk_buff
*skb
= *skbp
;
736 struct frag_hdr
*fhdr
;
737 struct frag_queue
*fq
;
738 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
740 IP6_INC_STATS_BH(ip6_dst_idev(skb
->dst
), IPSTATS_MIB_REASMREQDS
);
742 /* Jumbo payload inhibits frag. header */
743 if (hdr
->payload_len
==0) {
744 IP6_INC_STATS(ip6_dst_idev(skb
->dst
), IPSTATS_MIB_INHDRERRORS
);
745 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
,
746 skb_network_header_len(skb
));
749 if (!pskb_may_pull(skb
, (skb_transport_offset(skb
) +
750 sizeof(struct frag_hdr
)))) {
751 IP6_INC_STATS(ip6_dst_idev(skb
->dst
), IPSTATS_MIB_INHDRERRORS
);
752 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
,
753 skb_network_header_len(skb
));
758 fhdr
= (struct frag_hdr
*)skb_transport_header(skb
);
760 if (!(fhdr
->frag_off
& htons(0xFFF9))) {
761 /* It is not a fragmented frame */
762 skb
->transport_header
+= sizeof(struct frag_hdr
);
763 IP6_INC_STATS_BH(ip6_dst_idev(skb
->dst
), IPSTATS_MIB_REASMOKS
);
765 IP6CB(skb
)->nhoff
= (u8
*)fhdr
- skb_network_header(skb
);
769 if (atomic_read(&ip6_frag_mem
) > sysctl_ip6frag_high_thresh
)
770 ip6_evictor(ip6_dst_idev(skb
->dst
));
772 if ((fq
= fq_find(fhdr
->identification
, &hdr
->saddr
, &hdr
->daddr
,
773 ip6_dst_idev(skb
->dst
))) != NULL
) {
776 spin_lock(&fq
->lock
);
778 ret
= ip6_frag_queue(fq
, skb
, fhdr
, IP6CB(skb
)->nhoff
);
780 spin_unlock(&fq
->lock
);
785 IP6_INC_STATS_BH(ip6_dst_idev(skb
->dst
), IPSTATS_MIB_REASMFAILS
);
790 static struct inet6_protocol frag_protocol
=
792 .handler
= ipv6_frag_rcv
,
793 .flags
= INET6_PROTO_NOPOLICY
,
796 void __init
ipv6_frag_init(void)
798 if (inet6_add_protocol(&frag_protocol
, IPPROTO_FRAGMENT
) < 0)
799 printk(KERN_ERR
"ipv6_frag_init: Could not register protocol\n");
801 ip6_frag_hash_rnd
= (u32
) ((num_physpages
^ (num_physpages
>>7)) ^
802 (jiffies
^ (jiffies
>> 6)));
804 init_timer(&ip6_frag_secret_timer
);
805 ip6_frag_secret_timer
.function
= ip6_frag_secret_rebuild
;
806 ip6_frag_secret_timer
.expires
= jiffies
+ sysctl_ip6frag_secret_interval
;
807 add_timer(&ip6_frag_secret_timer
);