2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * The IP fragmentation functionality.
8 * Authors: Fred N. van Kempen <waltje@uWalt.NL.Mugnet.ORG>
9 * Alan Cox <alan@lxorguk.ukuu.org.uk>
12 * Alan Cox : Split from ip.c , see ip_input.c for history.
13 * David S. Miller : Begin massive cleanup...
14 * Andi Kleen : Add sysctls.
15 * xxxx : Overlapfrag bug.
16 * Ultima : ip_expire() kernel panic.
17 * Bill Hawes : Frag accounting and evictor fixes.
18 * John McDonald : 0 length frag bug.
19 * Alexey Kuznetsov: SMP races, threading, cleanup.
20 * Patrick McHardy : LRU queue of frag heads for evictor.
23 #define pr_fmt(fmt) "IPv4: " fmt
25 #include <linux/compiler.h>
26 #include <linux/module.h>
27 #include <linux/types.h>
29 #include <linux/jiffies.h>
30 #include <linux/skbuff.h>
31 #include <linux/list.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>
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>
52 /* NOTE. Logic of IP defragmentation is parallel to corresponding IPv6
53 * code now. If you change something here, _PLEASE_ update ipv6/reassembly.c
54 * as well. Or notify me, at least. --ANK
57 static int sysctl_ipfrag_max_dist __read_mostly
= 64;
58 static const char ip_frag_cache_name
[] = "ip4-frags";
62 struct inet_skb_parm h
;
66 #define FRAG_CB(skb) ((struct ipfrag_skb_cb *)((skb)->cb))
68 /* Describe an entry in the "incomplete datagrams" queue. */
70 struct inet_frag_queue q
;
77 u8 ecn
; /* RFC3168 support */
78 u16 max_df_size
; /* largest frag with DF set seen */
81 struct inet_peer
*peer
;
84 static u8
ip4_frag_ecn(u8 tos
)
86 return 1 << (tos
& INET_ECN_MASK
);
89 static struct inet_frags ip4_frags
;
91 int ip_frag_mem(struct net
*net
)
93 return sum_frag_mem_limit(&net
->ipv4
.frags
);
96 static int ip_frag_reasm(struct ipq
*qp
, struct sk_buff
*prev
,
97 struct net_device
*dev
);
99 struct ip4_create_arg
{
104 static unsigned int ipqhashfn(__be16 id
, __be32 saddr
, __be32 daddr
, u8 prot
)
106 net_get_random_once(&ip4_frags
.rnd
, sizeof(ip4_frags
.rnd
));
107 return jhash_3words((__force u32
)id
<< 16 | prot
,
108 (__force u32
)saddr
, (__force u32
)daddr
,
112 static unsigned int ip4_hashfn(const struct inet_frag_queue
*q
)
114 const struct ipq
*ipq
;
116 ipq
= container_of(q
, struct ipq
, q
);
117 return ipqhashfn(ipq
->id
, ipq
->saddr
, ipq
->daddr
, ipq
->protocol
);
120 static bool ip4_frag_match(const struct inet_frag_queue
*q
, const void *a
)
122 const struct ipq
*qp
;
123 const struct ip4_create_arg
*arg
= a
;
125 qp
= container_of(q
, struct ipq
, q
);
126 return qp
->id
== arg
->iph
->id
&&
127 qp
->saddr
== arg
->iph
->saddr
&&
128 qp
->daddr
== arg
->iph
->daddr
&&
129 qp
->protocol
== arg
->iph
->protocol
&&
130 qp
->user
== arg
->user
;
133 static void ip4_frag_init(struct inet_frag_queue
*q
, const void *a
)
135 struct ipq
*qp
= container_of(q
, struct ipq
, q
);
136 struct netns_ipv4
*ipv4
= container_of(q
->net
, struct netns_ipv4
,
138 struct net
*net
= container_of(ipv4
, struct net
, ipv4
);
140 const struct ip4_create_arg
*arg
= a
;
142 qp
->protocol
= arg
->iph
->protocol
;
143 qp
->id
= arg
->iph
->id
;
144 qp
->ecn
= ip4_frag_ecn(arg
->iph
->tos
);
145 qp
->saddr
= arg
->iph
->saddr
;
146 qp
->daddr
= arg
->iph
->daddr
;
147 qp
->user
= arg
->user
;
148 qp
->peer
= sysctl_ipfrag_max_dist
?
149 inet_getpeer_v4(net
->ipv4
.peers
, arg
->iph
->saddr
, 1) : NULL
;
152 static void ip4_frag_free(struct inet_frag_queue
*q
)
156 qp
= container_of(q
, struct ipq
, q
);
158 inet_putpeer(qp
->peer
);
162 /* Destruction primitives. */
164 static void ipq_put(struct ipq
*ipq
)
166 inet_frag_put(&ipq
->q
, &ip4_frags
);
169 /* Kill ipq entry. It is not destroyed immediately,
170 * because caller (and someone more) holds reference count.
172 static void ipq_kill(struct ipq
*ipq
)
174 inet_frag_kill(&ipq
->q
, &ip4_frags
);
177 static bool frag_expire_skip_icmp(u32 user
)
179 return user
== IP_DEFRAG_AF_PACKET
||
180 ip_defrag_user_in_between(user
, IP_DEFRAG_CONNTRACK_IN
,
181 __IP_DEFRAG_CONNTRACK_IN_END
) ||
182 ip_defrag_user_in_between(user
, IP_DEFRAG_CONNTRACK_BRIDGE_IN
,
183 __IP_DEFRAG_CONNTRACK_BRIDGE_IN
);
187 * Oops, a fragment queue timed out. Kill it and send an ICMP reply.
189 static void ip_expire(unsigned long arg
)
194 qp
= container_of((struct inet_frag_queue
*) arg
, struct ipq
, q
);
195 net
= container_of(qp
->q
.net
, struct net
, ipv4
.frags
);
197 spin_lock(&qp
->q
.lock
);
199 if (qp
->q
.flags
& INET_FRAG_COMPLETE
)
203 IP_INC_STATS_BH(net
, IPSTATS_MIB_REASMFAILS
);
205 if (!inet_frag_evicting(&qp
->q
)) {
206 struct sk_buff
*head
= qp
->q
.fragments
;
207 const struct iphdr
*iph
;
210 IP_INC_STATS_BH(net
, IPSTATS_MIB_REASMTIMEOUT
);
212 if (!(qp
->q
.flags
& INET_FRAG_FIRST_IN
) || !qp
->q
.fragments
)
216 head
->dev
= dev_get_by_index_rcu(net
, qp
->iif
);
220 /* skb has no dst, perform route lookup again */
222 err
= ip_route_input_noref(head
, iph
->daddr
, iph
->saddr
,
223 iph
->tos
, head
->dev
);
227 /* Only an end host needs to send an ICMP
228 * "Fragment Reassembly Timeout" message, per RFC792.
230 if (frag_expire_skip_icmp(qp
->user
) &&
231 (skb_rtable(head
)->rt_type
!= RTN_LOCAL
))
234 /* Send an ICMP "Fragment Reassembly Timeout" message. */
235 icmp_send(head
, ICMP_TIME_EXCEEDED
, ICMP_EXC_FRAGTIME
, 0);
240 spin_unlock(&qp
->q
.lock
);
244 /* Find the correct entry in the "incomplete datagrams" queue for
245 * this IP datagram, and create new one, if nothing is found.
247 static struct ipq
*ip_find(struct net
*net
, struct iphdr
*iph
, u32 user
)
249 struct inet_frag_queue
*q
;
250 struct ip4_create_arg arg
;
256 hash
= ipqhashfn(iph
->id
, iph
->saddr
, iph
->daddr
, iph
->protocol
);
258 q
= inet_frag_find(&net
->ipv4
.frags
, &ip4_frags
, &arg
, hash
);
259 if (IS_ERR_OR_NULL(q
)) {
260 inet_frag_maybe_warn_overflow(q
, pr_fmt());
263 return container_of(q
, struct ipq
, q
);
266 /* Is the fragment too far ahead to be part of ipq? */
267 static int ip_frag_too_far(struct ipq
*qp
)
269 struct inet_peer
*peer
= qp
->peer
;
270 unsigned int max
= sysctl_ipfrag_max_dist
;
271 unsigned int start
, end
;
279 end
= atomic_inc_return(&peer
->rid
);
282 rc
= qp
->q
.fragments
&& (end
- start
) > max
;
287 net
= container_of(qp
->q
.net
, struct net
, ipv4
.frags
);
288 IP_INC_STATS_BH(net
, IPSTATS_MIB_REASMFAILS
);
294 static int ip_frag_reinit(struct ipq
*qp
)
297 unsigned int sum_truesize
= 0;
299 if (!mod_timer(&qp
->q
.timer
, jiffies
+ qp
->q
.net
->timeout
)) {
300 atomic_inc(&qp
->q
.refcnt
);
304 fp
= qp
->q
.fragments
;
306 struct sk_buff
*xp
= fp
->next
;
308 sum_truesize
+= fp
->truesize
;
312 sub_frag_mem_limit(qp
->q
.net
, sum_truesize
);
317 qp
->q
.fragments
= NULL
;
318 qp
->q
.fragments_tail
= NULL
;
325 /* Add new segment to existing queue. */
326 static int ip_frag_queue(struct ipq
*qp
, struct sk_buff
*skb
)
328 struct sk_buff
*prev
, *next
;
329 struct net_device
*dev
;
330 unsigned int fragsize
;
336 if (qp
->q
.flags
& INET_FRAG_COMPLETE
)
339 if (!(IPCB(skb
)->flags
& IPSKB_FRAG_COMPLETE
) &&
340 unlikely(ip_frag_too_far(qp
)) &&
341 unlikely(err
= ip_frag_reinit(qp
))) {
346 ecn
= ip4_frag_ecn(ip_hdr(skb
)->tos
);
347 offset
= ntohs(ip_hdr(skb
)->frag_off
);
348 flags
= offset
& ~IP_OFFSET
;
350 offset
<<= 3; /* offset is in 8-byte chunks */
351 ihl
= ip_hdrlen(skb
);
353 /* Determine the position of this fragment. */
354 end
= offset
+ skb
->len
- skb_network_offset(skb
) - ihl
;
357 /* Is this the final fragment? */
358 if ((flags
& IP_MF
) == 0) {
359 /* If we already have some bits beyond end
360 * or have different end, the segment is corrupted.
362 if (end
< qp
->q
.len
||
363 ((qp
->q
.flags
& INET_FRAG_LAST_IN
) && end
!= qp
->q
.len
))
365 qp
->q
.flags
|= INET_FRAG_LAST_IN
;
370 if (skb
->ip_summed
!= CHECKSUM_UNNECESSARY
)
371 skb
->ip_summed
= CHECKSUM_NONE
;
373 if (end
> qp
->q
.len
) {
374 /* Some bits beyond end -> corruption. */
375 if (qp
->q
.flags
& INET_FRAG_LAST_IN
)
384 if (!pskb_pull(skb
, skb_network_offset(skb
) + ihl
))
387 err
= pskb_trim_rcsum(skb
, end
- offset
);
391 /* Find out which fragments are in front and at the back of us
392 * in the chain of fragments so far. We must know where to put
393 * this fragment, right?
395 prev
= qp
->q
.fragments_tail
;
396 if (!prev
|| FRAG_CB(prev
)->offset
< offset
) {
401 for (next
= qp
->q
.fragments
; next
!= NULL
; next
= next
->next
) {
402 if (FRAG_CB(next
)->offset
>= offset
)
408 /* We found where to put this one. Check for overlap with
409 * preceding fragment, and, if needed, align things so that
410 * any overlaps are eliminated.
413 int i
= (FRAG_CB(prev
)->offset
+ prev
->len
) - offset
;
421 if (!pskb_pull(skb
, i
))
423 if (skb
->ip_summed
!= CHECKSUM_UNNECESSARY
)
424 skb
->ip_summed
= CHECKSUM_NONE
;
430 while (next
&& FRAG_CB(next
)->offset
< end
) {
431 int i
= end
- FRAG_CB(next
)->offset
; /* overlap is 'i' bytes */
434 /* Eat head of the next overlapped fragment
435 * and leave the loop. The next ones cannot overlap.
437 if (!pskb_pull(next
, i
))
439 FRAG_CB(next
)->offset
+= i
;
441 if (next
->ip_summed
!= CHECKSUM_UNNECESSARY
)
442 next
->ip_summed
= CHECKSUM_NONE
;
445 struct sk_buff
*free_it
= next
;
447 /* Old fragment is completely overridden with
455 qp
->q
.fragments
= next
;
457 qp
->q
.meat
-= free_it
->len
;
458 sub_frag_mem_limit(qp
->q
.net
, free_it
->truesize
);
463 FRAG_CB(skb
)->offset
= offset
;
465 /* Insert this fragment in the chain of fragments. */
468 qp
->q
.fragments_tail
= skb
;
472 qp
->q
.fragments
= skb
;
476 qp
->iif
= dev
->ifindex
;
479 qp
->q
.stamp
= skb
->tstamp
;
480 qp
->q
.meat
+= skb
->len
;
482 add_frag_mem_limit(qp
->q
.net
, skb
->truesize
);
484 qp
->q
.flags
|= INET_FRAG_FIRST_IN
;
486 fragsize
= skb
->len
+ ihl
;
488 if (fragsize
> qp
->q
.max_size
)
489 qp
->q
.max_size
= fragsize
;
491 if (ip_hdr(skb
)->frag_off
& htons(IP_DF
) &&
492 fragsize
> qp
->max_df_size
)
493 qp
->max_df_size
= fragsize
;
495 if (qp
->q
.flags
== (INET_FRAG_FIRST_IN
| INET_FRAG_LAST_IN
) &&
496 qp
->q
.meat
== qp
->q
.len
) {
497 unsigned long orefdst
= skb
->_skb_refdst
;
499 skb
->_skb_refdst
= 0UL;
500 err
= ip_frag_reasm(qp
, prev
, dev
);
501 skb
->_skb_refdst
= orefdst
;
514 /* Build a new IP datagram from all its fragments. */
516 static int ip_frag_reasm(struct ipq
*qp
, struct sk_buff
*prev
,
517 struct net_device
*dev
)
519 struct net
*net
= container_of(qp
->q
.net
, struct net
, ipv4
.frags
);
521 struct sk_buff
*fp
, *head
= qp
->q
.fragments
;
529 ecn
= ip_frag_ecn_table
[qp
->ecn
];
530 if (unlikely(ecn
== 0xff)) {
534 /* Make the one we just received the head. */
537 fp
= skb_clone(head
, GFP_ATOMIC
);
541 fp
->next
= head
->next
;
543 qp
->q
.fragments_tail
= fp
;
546 skb_morph(head
, qp
->q
.fragments
);
547 head
->next
= qp
->q
.fragments
->next
;
549 consume_skb(qp
->q
.fragments
);
550 qp
->q
.fragments
= head
;
554 WARN_ON(FRAG_CB(head
)->offset
!= 0);
556 /* Allocate a new buffer for the datagram. */
557 ihlen
= ip_hdrlen(head
);
558 len
= ihlen
+ qp
->q
.len
;
564 /* Head of list must not be cloned. */
565 if (skb_unclone(head
, GFP_ATOMIC
))
568 /* If the first fragment is fragmented itself, we split
569 * it to two chunks: the first with data and paged part
570 * and the second, holding only fragments. */
571 if (skb_has_frag_list(head
)) {
572 struct sk_buff
*clone
;
575 clone
= alloc_skb(0, GFP_ATOMIC
);
578 clone
->next
= head
->next
;
580 skb_shinfo(clone
)->frag_list
= skb_shinfo(head
)->frag_list
;
581 skb_frag_list_init(head
);
582 for (i
= 0; i
< skb_shinfo(head
)->nr_frags
; i
++)
583 plen
+= skb_frag_size(&skb_shinfo(head
)->frags
[i
]);
584 clone
->len
= clone
->data_len
= head
->data_len
- plen
;
585 head
->data_len
-= clone
->len
;
586 head
->len
-= clone
->len
;
588 clone
->ip_summed
= head
->ip_summed
;
589 add_frag_mem_limit(qp
->q
.net
, clone
->truesize
);
592 skb_shinfo(head
)->frag_list
= head
->next
;
593 skb_push(head
, head
->data
- skb_network_header(head
));
595 for (fp
=head
->next
; fp
; fp
= fp
->next
) {
596 head
->data_len
+= fp
->len
;
597 head
->len
+= fp
->len
;
598 if (head
->ip_summed
!= fp
->ip_summed
)
599 head
->ip_summed
= CHECKSUM_NONE
;
600 else if (head
->ip_summed
== CHECKSUM_COMPLETE
)
601 head
->csum
= csum_add(head
->csum
, fp
->csum
);
602 head
->truesize
+= fp
->truesize
;
604 sub_frag_mem_limit(qp
->q
.net
, head
->truesize
);
608 head
->tstamp
= qp
->q
.stamp
;
609 IPCB(head
)->frag_max_size
= max(qp
->max_df_size
, qp
->q
.max_size
);
612 iph
->tot_len
= htons(len
);
615 /* When we set IP_DF on a refragmented skb we must also force a
616 * call to ip_fragment to avoid forwarding a DF-skb of size s while
617 * original sender only sent fragments of size f (where f < s).
619 * We only set DF/IPSKB_FRAG_PMTU if such DF fragment was the largest
620 * frag seen to avoid sending tiny DF-fragments in case skb was built
621 * from one very small df-fragment and one large non-df frag.
623 if (qp
->max_df_size
== qp
->q
.max_size
) {
624 IPCB(head
)->flags
|= IPSKB_FRAG_PMTU
;
625 iph
->frag_off
= htons(IP_DF
);
632 IP_INC_STATS_BH(net
, IPSTATS_MIB_REASMOKS
);
633 qp
->q
.fragments
= NULL
;
634 qp
->q
.fragments_tail
= NULL
;
638 net_dbg_ratelimited("queue_glue: no memory for gluing queue %p\n", qp
);
642 net_info_ratelimited("Oversized IP packet from %pI4\n", &qp
->saddr
);
644 IP_INC_STATS_BH(net
, IPSTATS_MIB_REASMFAILS
);
648 /* Process an incoming IP datagram fragment. */
649 int ip_defrag(struct sk_buff
*skb
, u32 user
)
654 net
= skb
->dev
? dev_net(skb
->dev
) : dev_net(skb_dst(skb
)->dev
);
655 IP_INC_STATS_BH(net
, IPSTATS_MIB_REASMREQDS
);
657 /* Lookup (or create) queue header */
658 qp
= ip_find(net
, ip_hdr(skb
), user
);
662 spin_lock(&qp
->q
.lock
);
664 ret
= ip_frag_queue(qp
, skb
);
666 spin_unlock(&qp
->q
.lock
);
671 IP_INC_STATS_BH(net
, IPSTATS_MIB_REASMFAILS
);
675 EXPORT_SYMBOL(ip_defrag
);
677 struct sk_buff
*ip_check_defrag(struct sk_buff
*skb
, u32 user
)
683 if (skb
->protocol
!= htons(ETH_P_IP
))
686 netoff
= skb_network_offset(skb
);
688 if (skb_copy_bits(skb
, netoff
, &iph
, sizeof(iph
)) < 0)
691 if (iph
.ihl
< 5 || iph
.version
!= 4)
694 len
= ntohs(iph
.tot_len
);
695 if (skb
->len
< netoff
+ len
|| len
< (iph
.ihl
* 4))
698 if (ip_is_fragment(&iph
)) {
699 skb
= skb_share_check(skb
, GFP_ATOMIC
);
701 if (!pskb_may_pull(skb
, netoff
+ iph
.ihl
* 4))
703 if (pskb_trim_rcsum(skb
, netoff
+ len
))
705 memset(IPCB(skb
), 0, sizeof(struct inet_skb_parm
));
706 if (ip_defrag(skb
, user
))
713 EXPORT_SYMBOL(ip_check_defrag
);
718 static struct ctl_table ip4_frags_ns_ctl_table
[] = {
720 .procname
= "ipfrag_high_thresh",
721 .data
= &init_net
.ipv4
.frags
.high_thresh
,
722 .maxlen
= sizeof(int),
724 .proc_handler
= proc_dointvec_minmax
,
725 .extra1
= &init_net
.ipv4
.frags
.low_thresh
728 .procname
= "ipfrag_low_thresh",
729 .data
= &init_net
.ipv4
.frags
.low_thresh
,
730 .maxlen
= sizeof(int),
732 .proc_handler
= proc_dointvec_minmax
,
734 .extra2
= &init_net
.ipv4
.frags
.high_thresh
737 .procname
= "ipfrag_time",
738 .data
= &init_net
.ipv4
.frags
.timeout
,
739 .maxlen
= sizeof(int),
741 .proc_handler
= proc_dointvec_jiffies
,
746 /* secret interval has been deprecated */
747 static int ip4_frags_secret_interval_unused
;
748 static struct ctl_table ip4_frags_ctl_table
[] = {
750 .procname
= "ipfrag_secret_interval",
751 .data
= &ip4_frags_secret_interval_unused
,
752 .maxlen
= sizeof(int),
754 .proc_handler
= proc_dointvec_jiffies
,
757 .procname
= "ipfrag_max_dist",
758 .data
= &sysctl_ipfrag_max_dist
,
759 .maxlen
= sizeof(int),
761 .proc_handler
= proc_dointvec_minmax
,
767 static int __net_init
ip4_frags_ns_ctl_register(struct net
*net
)
769 struct ctl_table
*table
;
770 struct ctl_table_header
*hdr
;
772 table
= ip4_frags_ns_ctl_table
;
773 if (!net_eq(net
, &init_net
)) {
774 table
= kmemdup(table
, sizeof(ip4_frags_ns_ctl_table
), GFP_KERNEL
);
778 table
[0].data
= &net
->ipv4
.frags
.high_thresh
;
779 table
[0].extra1
= &net
->ipv4
.frags
.low_thresh
;
780 table
[0].extra2
= &init_net
.ipv4
.frags
.high_thresh
;
781 table
[1].data
= &net
->ipv4
.frags
.low_thresh
;
782 table
[1].extra2
= &net
->ipv4
.frags
.high_thresh
;
783 table
[2].data
= &net
->ipv4
.frags
.timeout
;
785 /* Don't export sysctls to unprivileged users */
786 if (net
->user_ns
!= &init_user_ns
)
787 table
[0].procname
= NULL
;
790 hdr
= register_net_sysctl(net
, "net/ipv4", table
);
794 net
->ipv4
.frags_hdr
= hdr
;
798 if (!net_eq(net
, &init_net
))
804 static void __net_exit
ip4_frags_ns_ctl_unregister(struct net
*net
)
806 struct ctl_table
*table
;
808 table
= net
->ipv4
.frags_hdr
->ctl_table_arg
;
809 unregister_net_sysctl_table(net
->ipv4
.frags_hdr
);
813 static void __init
ip4_frags_ctl_register(void)
815 register_net_sysctl(&init_net
, "net/ipv4", ip4_frags_ctl_table
);
818 static int ip4_frags_ns_ctl_register(struct net
*net
)
823 static void ip4_frags_ns_ctl_unregister(struct net
*net
)
827 static void __init
ip4_frags_ctl_register(void)
832 static int __net_init
ipv4_frags_init_net(struct net
*net
)
834 /* Fragment cache limits.
836 * The fragment memory accounting code, (tries to) account for
837 * the real memory usage, by measuring both the size of frag
838 * queue struct (inet_frag_queue (ipv4:ipq/ipv6:frag_queue))
839 * and the SKB's truesize.
841 * A 64K fragment consumes 129736 bytes (44*2944)+200
842 * (1500 truesize == 2944, sizeof(struct ipq) == 200)
844 * We will commit 4MB at one time. Should we cross that limit
845 * we will prune down to 3MB, making room for approx 8 big 64K
848 net
->ipv4
.frags
.high_thresh
= 4 * 1024 * 1024;
849 net
->ipv4
.frags
.low_thresh
= 3 * 1024 * 1024;
851 * Important NOTE! Fragment queue must be destroyed before MSL expires.
852 * RFC791 is wrong proposing to prolongate timer each fragment arrival
855 net
->ipv4
.frags
.timeout
= IP_FRAG_TIME
;
857 inet_frags_init_net(&net
->ipv4
.frags
);
859 return ip4_frags_ns_ctl_register(net
);
862 static void __net_exit
ipv4_frags_exit_net(struct net
*net
)
864 ip4_frags_ns_ctl_unregister(net
);
865 inet_frags_exit_net(&net
->ipv4
.frags
, &ip4_frags
);
868 static struct pernet_operations ip4_frags_ops
= {
869 .init
= ipv4_frags_init_net
,
870 .exit
= ipv4_frags_exit_net
,
873 void __init
ipfrag_init(void)
875 ip4_frags_ctl_register();
876 register_pernet_subsys(&ip4_frags_ops
);
877 ip4_frags
.hashfn
= ip4_hashfn
;
878 ip4_frags
.constructor
= ip4_frag_init
;
879 ip4_frags
.destructor
= ip4_frag_free
;
880 ip4_frags
.skb_free
= NULL
;
881 ip4_frags
.qsize
= sizeof(struct ipq
);
882 ip4_frags
.match
= ip4_frag_match
;
883 ip4_frags
.frag_expire
= ip_expire
;
884 ip4_frags
.frags_cache_name
= ip_frag_cache_name
;
885 if (inet_frags_init(&ip4_frags
))
886 panic("IP: failed to allocate ip4_frags cache\n");