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.
30 #define pr_fmt(fmt) "IPv6: " fmt
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>
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/inet_frag.h>
61 #include <net/inet_ecn.h>
63 static const char ip6_frag_cache_name
[] = "ip6-frags";
65 struct ip6frag_skb_cb
{
66 struct inet6_skb_parm h
;
70 #define FRAG6_CB(skb) ((struct ip6frag_skb_cb *)((skb)->cb))
72 static u8
ip6_frag_ecn(const struct ipv6hdr
*ipv6h
)
74 return 1 << (ipv6_get_dsfield(ipv6h
) & INET_ECN_MASK
);
77 static struct inet_frags ip6_frags
;
79 static int ip6_frag_reasm(struct frag_queue
*fq
, struct sk_buff
*prev
,
80 struct net_device
*dev
);
82 void ip6_frag_init(struct inet_frag_queue
*q
, const void *a
)
84 struct frag_queue
*fq
= container_of(q
, struct frag_queue
, q
);
85 const struct frag_v6_compare_key
*key
= a
;
90 EXPORT_SYMBOL(ip6_frag_init
);
92 void ip6_expire_frag_queue(struct net
*net
, struct frag_queue
*fq
)
94 struct net_device
*dev
= NULL
;
96 spin_lock(&fq
->q
.lock
);
98 if (fq
->q
.flags
& INET_FRAG_COMPLETE
)
101 inet_frag_kill(&fq
->q
);
104 dev
= dev_get_by_index_rcu(net
, fq
->iif
);
108 __IP6_INC_STATS(net
, __in6_dev_get(dev
), IPSTATS_MIB_REASMFAILS
);
110 if (inet_frag_evicting(&fq
->q
))
113 __IP6_INC_STATS(net
, __in6_dev_get(dev
), IPSTATS_MIB_REASMTIMEOUT
);
115 /* Don't send error if the first segment did not arrive. */
116 if (!(fq
->q
.flags
& INET_FRAG_FIRST_IN
) || !fq
->q
.fragments
)
119 /* But use as source device on which LAST ARRIVED
120 * segment was received. And do not use fq->dev
121 * pointer directly, device might already disappeared.
123 fq
->q
.fragments
->dev
= dev
;
124 icmpv6_send(fq
->q
.fragments
, ICMPV6_TIME_EXCEED
, ICMPV6_EXC_FRAGTIME
, 0);
128 spin_unlock(&fq
->q
.lock
);
129 inet_frag_put(&fq
->q
);
131 EXPORT_SYMBOL(ip6_expire_frag_queue
);
133 static void ip6_frag_expire(struct timer_list
*t
)
135 struct inet_frag_queue
*frag
= from_timer(frag
, t
, timer
);
136 struct frag_queue
*fq
;
139 fq
= container_of(frag
, struct frag_queue
, q
);
140 net
= container_of(fq
->q
.net
, struct net
, ipv6
.frags
);
142 ip6_expire_frag_queue(net
, fq
);
145 static struct frag_queue
*
146 fq_find(struct net
*net
, __be32 id
, const struct ipv6hdr
*hdr
, int iif
)
148 struct frag_v6_compare_key key
= {
152 .user
= IP6_DEFRAG_LOCAL_DELIVER
,
155 struct inet_frag_queue
*q
;
157 if (!(ipv6_addr_type(&hdr
->daddr
) & (IPV6_ADDR_MULTICAST
|
158 IPV6_ADDR_LINKLOCAL
)))
161 q
= inet_frag_find(&net
->ipv6
.frags
, &key
);
162 if (IS_ERR_OR_NULL(q
)) {
163 inet_frag_maybe_warn_overflow(q
, pr_fmt());
166 return container_of(q
, struct frag_queue
, q
);
169 static int ip6_frag_queue(struct frag_queue
*fq
, struct sk_buff
*skb
,
170 struct frag_hdr
*fhdr
, int nhoff
)
172 struct sk_buff
*prev
, *next
;
173 struct net_device
*dev
;
174 int offset
, end
, fragsize
;
175 struct net
*net
= dev_net(skb_dst(skb
)->dev
);
178 if (fq
->q
.flags
& INET_FRAG_COMPLETE
)
181 offset
= ntohs(fhdr
->frag_off
) & ~0x7;
182 end
= offset
+ (ntohs(ipv6_hdr(skb
)->payload_len
) -
183 ((u8
*)(fhdr
+ 1) - (u8
*)(ipv6_hdr(skb
) + 1)));
185 if ((unsigned int)end
> IPV6_MAXPLEN
) {
186 __IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
187 IPSTATS_MIB_INHDRERRORS
);
188 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
,
189 ((u8
*)&fhdr
->frag_off
-
190 skb_network_header(skb
)));
194 ecn
= ip6_frag_ecn(ipv6_hdr(skb
));
196 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
197 const unsigned char *nh
= skb_network_header(skb
);
198 skb
->csum
= csum_sub(skb
->csum
,
199 csum_partial(nh
, (u8
*)(fhdr
+ 1) - nh
,
203 /* Is this the final fragment? */
204 if (!(fhdr
->frag_off
& htons(IP6_MF
))) {
205 /* If we already have some bits beyond end
206 * or have different end, the segment is corrupted.
208 if (end
< fq
->q
.len
||
209 ((fq
->q
.flags
& INET_FRAG_LAST_IN
) && end
!= fq
->q
.len
))
211 fq
->q
.flags
|= INET_FRAG_LAST_IN
;
214 /* Check if the fragment is rounded to 8 bytes.
215 * Required by the RFC.
218 /* RFC2460 says always send parameter problem in
221 __IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
222 IPSTATS_MIB_INHDRERRORS
);
223 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
,
224 offsetof(struct ipv6hdr
, payload_len
));
227 if (end
> fq
->q
.len
) {
228 /* Some bits beyond end -> corruption. */
229 if (fq
->q
.flags
& INET_FRAG_LAST_IN
)
238 /* Point into the IP datagram 'data' part. */
239 if (!pskb_pull(skb
, (u8
*) (fhdr
+ 1) - skb
->data
))
242 if (pskb_trim_rcsum(skb
, end
- offset
))
245 /* Find out which fragments are in front and at the back of us
246 * in the chain of fragments so far. We must know where to put
247 * this fragment, right?
249 prev
= fq
->q
.fragments_tail
;
250 if (!prev
|| FRAG6_CB(prev
)->offset
< offset
) {
255 for (next
= fq
->q
.fragments
; next
!= NULL
; next
= next
->next
) {
256 if (FRAG6_CB(next
)->offset
>= offset
)
262 /* RFC5722, Section 4, amended by Errata ID : 3089
263 * When reassembling an IPv6 datagram, if
264 * one or more its constituent fragments is determined to be an
265 * overlapping fragment, the entire datagram (and any constituent
266 * fragments) MUST be silently discarded.
269 /* Check for overlap with preceding fragment. */
271 (FRAG6_CB(prev
)->offset
+ prev
->len
) > offset
)
274 /* Look for overlap with succeeding segment. */
275 if (next
&& FRAG6_CB(next
)->offset
< end
)
278 FRAG6_CB(skb
)->offset
= offset
;
280 /* Insert this fragment in the chain of fragments. */
283 fq
->q
.fragments_tail
= skb
;
287 fq
->q
.fragments
= skb
;
291 fq
->iif
= dev
->ifindex
;
294 fq
->q
.stamp
= skb
->tstamp
;
295 fq
->q
.meat
+= skb
->len
;
297 add_frag_mem_limit(fq
->q
.net
, skb
->truesize
);
299 fragsize
= -skb_network_offset(skb
) + skb
->len
;
300 if (fragsize
> fq
->q
.max_size
)
301 fq
->q
.max_size
= fragsize
;
303 /* The first fragment.
304 * nhoffset is obtained from the first fragment, of course.
307 fq
->nhoffset
= nhoff
;
308 fq
->q
.flags
|= INET_FRAG_FIRST_IN
;
311 if (fq
->q
.flags
== (INET_FRAG_FIRST_IN
| INET_FRAG_LAST_IN
) &&
312 fq
->q
.meat
== fq
->q
.len
) {
314 unsigned long orefdst
= skb
->_skb_refdst
;
316 skb
->_skb_refdst
= 0UL;
317 res
= ip6_frag_reasm(fq
, prev
, dev
);
318 skb
->_skb_refdst
= orefdst
;
326 inet_frag_kill(&fq
->q
);
328 __IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
329 IPSTATS_MIB_REASMFAILS
);
335 * Check if this packet is complete.
336 * Returns NULL on failure by any reason, and pointer
337 * to current nexthdr field in reassembled frame.
339 * It is called with locked fq, and caller must check that
340 * queue is eligible for reassembly i.e. it is not COMPLETE,
341 * the last and the first frames arrived and all the bits are here.
343 static int ip6_frag_reasm(struct frag_queue
*fq
, struct sk_buff
*prev
,
344 struct net_device
*dev
)
346 struct net
*net
= container_of(fq
->q
.net
, struct net
, ipv6
.frags
);
347 struct sk_buff
*fp
, *head
= fq
->q
.fragments
;
353 inet_frag_kill(&fq
->q
);
355 ecn
= ip_frag_ecn_table
[fq
->ecn
];
356 if (unlikely(ecn
== 0xff))
359 /* Make the one we just received the head. */
362 fp
= skb_clone(head
, GFP_ATOMIC
);
367 fp
->next
= head
->next
;
369 fq
->q
.fragments_tail
= fp
;
372 skb_morph(head
, fq
->q
.fragments
);
373 head
->next
= fq
->q
.fragments
->next
;
375 consume_skb(fq
->q
.fragments
);
376 fq
->q
.fragments
= head
;
379 WARN_ON(head
== NULL
);
380 WARN_ON(FRAG6_CB(head
)->offset
!= 0);
382 /* Unfragmented part is taken from the first segment. */
383 payload_len
= ((head
->data
- skb_network_header(head
)) -
384 sizeof(struct ipv6hdr
) + fq
->q
.len
-
385 sizeof(struct frag_hdr
));
386 if (payload_len
> IPV6_MAXPLEN
)
389 /* Head of list must not be cloned. */
390 if (skb_unclone(head
, GFP_ATOMIC
))
393 /* If the first fragment is fragmented itself, we split
394 * it to two chunks: the first with data and paged part
395 * and the second, holding only fragments. */
396 if (skb_has_frag_list(head
)) {
397 struct sk_buff
*clone
;
400 clone
= alloc_skb(0, GFP_ATOMIC
);
403 clone
->next
= head
->next
;
405 skb_shinfo(clone
)->frag_list
= skb_shinfo(head
)->frag_list
;
406 skb_frag_list_init(head
);
407 for (i
= 0; i
< skb_shinfo(head
)->nr_frags
; i
++)
408 plen
+= skb_frag_size(&skb_shinfo(head
)->frags
[i
]);
409 clone
->len
= clone
->data_len
= head
->data_len
- plen
;
410 head
->data_len
-= clone
->len
;
411 head
->len
-= clone
->len
;
413 clone
->ip_summed
= head
->ip_summed
;
414 add_frag_mem_limit(fq
->q
.net
, clone
->truesize
);
417 /* We have to remove fragment header from datagram and to relocate
418 * header in order to calculate ICV correctly. */
419 nhoff
= fq
->nhoffset
;
420 skb_network_header(head
)[nhoff
] = skb_transport_header(head
)[0];
421 memmove(head
->head
+ sizeof(struct frag_hdr
), head
->head
,
422 (head
->data
- head
->head
) - sizeof(struct frag_hdr
));
423 if (skb_mac_header_was_set(head
))
424 head
->mac_header
+= sizeof(struct frag_hdr
);
425 head
->network_header
+= sizeof(struct frag_hdr
);
427 skb_reset_transport_header(head
);
428 skb_push(head
, head
->data
- skb_network_header(head
));
430 sum_truesize
= head
->truesize
;
431 for (fp
= head
->next
; fp
;) {
434 struct sk_buff
*next
= fp
->next
;
436 sum_truesize
+= fp
->truesize
;
437 if (head
->ip_summed
!= fp
->ip_summed
)
438 head
->ip_summed
= CHECKSUM_NONE
;
439 else if (head
->ip_summed
== CHECKSUM_COMPLETE
)
440 head
->csum
= csum_add(head
->csum
, fp
->csum
);
442 if (skb_try_coalesce(head
, fp
, &headstolen
, &delta
)) {
443 kfree_skb_partial(fp
, headstolen
);
445 if (!skb_shinfo(head
)->frag_list
)
446 skb_shinfo(head
)->frag_list
= fp
;
447 head
->data_len
+= fp
->len
;
448 head
->len
+= fp
->len
;
449 head
->truesize
+= fp
->truesize
;
453 sub_frag_mem_limit(fq
->q
.net
, sum_truesize
);
457 head
->tstamp
= fq
->q
.stamp
;
458 ipv6_hdr(head
)->payload_len
= htons(payload_len
);
459 ipv6_change_dsfield(ipv6_hdr(head
), 0xff, ecn
);
460 IP6CB(head
)->nhoff
= nhoff
;
461 IP6CB(head
)->flags
|= IP6SKB_FRAGMENTED
;
462 IP6CB(head
)->frag_max_size
= fq
->q
.max_size
;
464 /* Yes, and fold redundant checksum back. 8) */
465 skb_postpush_rcsum(head
, skb_network_header(head
),
466 skb_network_header_len(head
));
469 __IP6_INC_STATS(net
, __in6_dev_get(dev
), IPSTATS_MIB_REASMOKS
);
471 fq
->q
.fragments
= NULL
;
472 fq
->q
.fragments_tail
= NULL
;
476 net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len
);
479 net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
482 __IP6_INC_STATS(net
, __in6_dev_get(dev
), IPSTATS_MIB_REASMFAILS
);
487 static int ipv6_frag_rcv(struct sk_buff
*skb
)
489 struct frag_hdr
*fhdr
;
490 struct frag_queue
*fq
;
491 const struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
492 struct net
*net
= dev_net(skb_dst(skb
)->dev
);
495 if (IP6CB(skb
)->flags
& IP6SKB_FRAGMENTED
)
498 __IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_REASMREQDS
);
500 /* Jumbo payload inhibits frag. header */
501 if (hdr
->payload_len
== 0)
504 if (!pskb_may_pull(skb
, (skb_transport_offset(skb
) +
505 sizeof(struct frag_hdr
))))
509 fhdr
= (struct frag_hdr
*)skb_transport_header(skb
);
511 if (!(fhdr
->frag_off
& htons(0xFFF9))) {
512 /* It is not a fragmented frame */
513 skb
->transport_header
+= sizeof(struct frag_hdr
);
515 ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_REASMOKS
);
517 IP6CB(skb
)->nhoff
= (u8
*)fhdr
- skb_network_header(skb
);
518 IP6CB(skb
)->flags
|= IP6SKB_FRAGMENTED
;
522 iif
= skb
->dev
? skb
->dev
->ifindex
: 0;
523 fq
= fq_find(net
, fhdr
->identification
, hdr
, iif
);
527 spin_lock(&fq
->q
.lock
);
530 ret
= ip6_frag_queue(fq
, skb
, fhdr
, IP6CB(skb
)->nhoff
);
532 spin_unlock(&fq
->q
.lock
);
533 inet_frag_put(&fq
->q
);
537 __IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_REASMFAILS
);
542 __IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
543 IPSTATS_MIB_INHDRERRORS
);
544 icmpv6_param_prob(skb
, ICMPV6_HDR_FIELD
, skb_network_header_len(skb
));
548 static const struct inet6_protocol frag_protocol
= {
549 .handler
= ipv6_frag_rcv
,
550 .flags
= INET6_PROTO_NOPOLICY
,
556 static struct ctl_table ip6_frags_ns_ctl_table
[] = {
558 .procname
= "ip6frag_high_thresh",
559 .data
= &init_net
.ipv6
.frags
.high_thresh
,
560 .maxlen
= sizeof(int),
562 .proc_handler
= proc_dointvec_minmax
,
563 .extra1
= &init_net
.ipv6
.frags
.low_thresh
566 .procname
= "ip6frag_low_thresh",
567 .data
= &init_net
.ipv6
.frags
.low_thresh
,
568 .maxlen
= sizeof(int),
570 .proc_handler
= proc_dointvec_minmax
,
572 .extra2
= &init_net
.ipv6
.frags
.high_thresh
575 .procname
= "ip6frag_time",
576 .data
= &init_net
.ipv6
.frags
.timeout
,
577 .maxlen
= sizeof(int),
579 .proc_handler
= proc_dointvec_jiffies
,
584 /* secret interval has been deprecated */
585 static int ip6_frags_secret_interval_unused
;
586 static struct ctl_table ip6_frags_ctl_table
[] = {
588 .procname
= "ip6frag_secret_interval",
589 .data
= &ip6_frags_secret_interval_unused
,
590 .maxlen
= sizeof(int),
592 .proc_handler
= proc_dointvec_jiffies
,
597 static int __net_init
ip6_frags_ns_sysctl_register(struct net
*net
)
599 struct ctl_table
*table
;
600 struct ctl_table_header
*hdr
;
602 table
= ip6_frags_ns_ctl_table
;
603 if (!net_eq(net
, &init_net
)) {
604 table
= kmemdup(table
, sizeof(ip6_frags_ns_ctl_table
), GFP_KERNEL
);
608 table
[0].data
= &net
->ipv6
.frags
.high_thresh
;
609 table
[0].extra1
= &net
->ipv6
.frags
.low_thresh
;
610 table
[0].extra2
= &init_net
.ipv6
.frags
.high_thresh
;
611 table
[1].data
= &net
->ipv6
.frags
.low_thresh
;
612 table
[1].extra2
= &net
->ipv6
.frags
.high_thresh
;
613 table
[2].data
= &net
->ipv6
.frags
.timeout
;
616 hdr
= register_net_sysctl(net
, "net/ipv6", table
);
620 net
->ipv6
.sysctl
.frags_hdr
= hdr
;
624 if (!net_eq(net
, &init_net
))
630 static void __net_exit
ip6_frags_ns_sysctl_unregister(struct net
*net
)
632 struct ctl_table
*table
;
634 table
= net
->ipv6
.sysctl
.frags_hdr
->ctl_table_arg
;
635 unregister_net_sysctl_table(net
->ipv6
.sysctl
.frags_hdr
);
636 if (!net_eq(net
, &init_net
))
640 static struct ctl_table_header
*ip6_ctl_header
;
642 static int ip6_frags_sysctl_register(void)
644 ip6_ctl_header
= register_net_sysctl(&init_net
, "net/ipv6",
645 ip6_frags_ctl_table
);
646 return ip6_ctl_header
== NULL
? -ENOMEM
: 0;
649 static void ip6_frags_sysctl_unregister(void)
651 unregister_net_sysctl_table(ip6_ctl_header
);
654 static int ip6_frags_ns_sysctl_register(struct net
*net
)
659 static void ip6_frags_ns_sysctl_unregister(struct net
*net
)
663 static int ip6_frags_sysctl_register(void)
668 static void ip6_frags_sysctl_unregister(void)
673 static int __net_init
ipv6_frags_init_net(struct net
*net
)
677 net
->ipv6
.frags
.high_thresh
= IPV6_FRAG_HIGH_THRESH
;
678 net
->ipv6
.frags
.low_thresh
= IPV6_FRAG_LOW_THRESH
;
679 net
->ipv6
.frags
.timeout
= IPV6_FRAG_TIMEOUT
;
680 net
->ipv6
.frags
.f
= &ip6_frags
;
682 res
= inet_frags_init_net(&net
->ipv6
.frags
);
686 res
= ip6_frags_ns_sysctl_register(net
);
688 inet_frags_exit_net(&net
->ipv6
.frags
);
692 static void __net_exit
ipv6_frags_exit_net(struct net
*net
)
694 ip6_frags_ns_sysctl_unregister(net
);
695 inet_frags_exit_net(&net
->ipv6
.frags
);
698 static struct pernet_operations ip6_frags_ops
= {
699 .init
= ipv6_frags_init_net
,
700 .exit
= ipv6_frags_exit_net
,
703 static u32
ip6_key_hashfn(const void *data
, u32 len
, u32 seed
)
706 sizeof(struct frag_v6_compare_key
) / sizeof(u32
), seed
);
709 static u32
ip6_obj_hashfn(const void *data
, u32 len
, u32 seed
)
711 const struct inet_frag_queue
*fq
= data
;
713 return jhash2((const u32
*)&fq
->key
.v6
,
714 sizeof(struct frag_v6_compare_key
) / sizeof(u32
), seed
);
717 static int ip6_obj_cmpfn(struct rhashtable_compare_arg
*arg
, const void *ptr
)
719 const struct frag_v6_compare_key
*key
= arg
->key
;
720 const struct inet_frag_queue
*fq
= ptr
;
722 return !!memcmp(&fq
->key
, key
, sizeof(*key
));
725 const struct rhashtable_params ip6_rhash_params
= {
726 .head_offset
= offsetof(struct inet_frag_queue
, node
),
727 .hashfn
= ip6_key_hashfn
,
728 .obj_hashfn
= ip6_obj_hashfn
,
729 .obj_cmpfn
= ip6_obj_cmpfn
,
730 .automatic_shrinking
= true,
732 EXPORT_SYMBOL(ip6_rhash_params
);
734 int __init
ipv6_frag_init(void)
738 ip6_frags
.constructor
= ip6_frag_init
;
739 ip6_frags
.destructor
= NULL
;
740 ip6_frags
.qsize
= sizeof(struct frag_queue
);
741 ip6_frags
.frag_expire
= ip6_frag_expire
;
742 ip6_frags
.frags_cache_name
= ip6_frag_cache_name
;
743 ip6_frags
.rhash_params
= ip6_rhash_params
;
744 ret
= inet_frags_init(&ip6_frags
);
748 ret
= inet6_add_protocol(&frag_protocol
, IPPROTO_FRAGMENT
);
752 ret
= ip6_frags_sysctl_register();
756 ret
= register_pernet_subsys(&ip6_frags_ops
);
764 ip6_frags_sysctl_unregister();
766 inet6_del_protocol(&frag_protocol
, IPPROTO_FRAGMENT
);
768 inet_frags_fini(&ip6_frags
);
772 void ipv6_frag_exit(void)
774 inet_frags_fini(&ip6_frags
);
775 ip6_frags_sysctl_unregister();
776 unregister_pernet_subsys(&ip6_frags_ops
);
777 inet6_del_protocol(&frag_protocol
, IPPROTO_FRAGMENT
);