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>
51 #include <net/l3mdev.h>
53 /* NOTE. Logic of IP defragmentation is parallel to corresponding IPv6
54 * code now. If you change something here, _PLEASE_ update ipv6/reassembly.c
55 * as well. Or notify me, at least. --ANK
57 static const char ip_frag_cache_name
[] = "ip4-frags";
61 struct inet_skb_parm h
;
65 #define FRAG_CB(skb) ((struct ipfrag_skb_cb *)((skb)->cb))
67 /* Describe an entry in the "incomplete datagrams" queue. */
69 struct inet_frag_queue q
;
76 u8 ecn
; /* RFC3168 support */
77 u16 max_df_size
; /* largest frag with DF set seen */
79 int vif
; /* L3 master device index */
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
{
105 static unsigned int ipqhashfn(__be16 id
, __be32 saddr
, __be32 daddr
, u8 prot
)
107 net_get_random_once(&ip4_frags
.rnd
, sizeof(ip4_frags
.rnd
));
108 return jhash_3words((__force u32
)id
<< 16 | prot
,
109 (__force u32
)saddr
, (__force u32
)daddr
,
113 static unsigned int ip4_hashfn(const struct inet_frag_queue
*q
)
115 const struct ipq
*ipq
;
117 ipq
= container_of(q
, struct ipq
, q
);
118 return ipqhashfn(ipq
->id
, ipq
->saddr
, ipq
->daddr
, ipq
->protocol
);
121 static bool ip4_frag_match(const struct inet_frag_queue
*q
, const void *a
)
123 const struct ipq
*qp
;
124 const struct ip4_create_arg
*arg
= a
;
126 qp
= container_of(q
, struct ipq
, q
);
127 return qp
->id
== arg
->iph
->id
&&
128 qp
->saddr
== arg
->iph
->saddr
&&
129 qp
->daddr
== arg
->iph
->daddr
&&
130 qp
->protocol
== arg
->iph
->protocol
&&
131 qp
->user
== arg
->user
&&
135 static void ip4_frag_init(struct inet_frag_queue
*q
, const void *a
)
137 struct ipq
*qp
= container_of(q
, struct ipq
, q
);
138 struct netns_ipv4
*ipv4
= container_of(q
->net
, struct netns_ipv4
,
140 struct net
*net
= container_of(ipv4
, struct net
, ipv4
);
142 const struct ip4_create_arg
*arg
= a
;
144 qp
->protocol
= arg
->iph
->protocol
;
145 qp
->id
= arg
->iph
->id
;
146 qp
->ecn
= ip4_frag_ecn(arg
->iph
->tos
);
147 qp
->saddr
= arg
->iph
->saddr
;
148 qp
->daddr
= arg
->iph
->daddr
;
150 qp
->user
= arg
->user
;
151 qp
->peer
= q
->net
->max_dist
?
152 inet_getpeer_v4(net
->ipv4
.peers
, arg
->iph
->saddr
, arg
->vif
, 1) :
156 static void ip4_frag_free(struct inet_frag_queue
*q
)
160 qp
= container_of(q
, struct ipq
, q
);
162 inet_putpeer(qp
->peer
);
166 /* Destruction primitives. */
168 static void ipq_put(struct ipq
*ipq
)
170 inet_frag_put(&ipq
->q
, &ip4_frags
);
173 /* Kill ipq entry. It is not destroyed immediately,
174 * because caller (and someone more) holds reference count.
176 static void ipq_kill(struct ipq
*ipq
)
178 inet_frag_kill(&ipq
->q
, &ip4_frags
);
181 static bool frag_expire_skip_icmp(u32 user
)
183 return user
== IP_DEFRAG_AF_PACKET
||
184 ip_defrag_user_in_between(user
, IP_DEFRAG_CONNTRACK_IN
,
185 __IP_DEFRAG_CONNTRACK_IN_END
) ||
186 ip_defrag_user_in_between(user
, IP_DEFRAG_CONNTRACK_BRIDGE_IN
,
187 __IP_DEFRAG_CONNTRACK_BRIDGE_IN
);
191 * Oops, a fragment queue timed out. Kill it and send an ICMP reply.
193 static void ip_expire(unsigned long arg
)
198 qp
= container_of((struct inet_frag_queue
*) arg
, struct ipq
, q
);
199 net
= container_of(qp
->q
.net
, struct net
, ipv4
.frags
);
202 spin_lock(&qp
->q
.lock
);
204 if (qp
->q
.flags
& INET_FRAG_COMPLETE
)
208 __IP_INC_STATS(net
, IPSTATS_MIB_REASMFAILS
);
210 if (!inet_frag_evicting(&qp
->q
)) {
211 struct sk_buff
*clone
, *head
= qp
->q
.fragments
;
212 const struct iphdr
*iph
;
215 __IP_INC_STATS(net
, IPSTATS_MIB_REASMTIMEOUT
);
217 if (!(qp
->q
.flags
& INET_FRAG_FIRST_IN
) || !qp
->q
.fragments
)
220 head
->dev
= dev_get_by_index_rcu(net
, qp
->iif
);
225 /* skb has no dst, perform route lookup again */
227 err
= ip_route_input_noref(head
, iph
->daddr
, iph
->saddr
,
228 iph
->tos
, head
->dev
);
232 /* Only an end host needs to send an ICMP
233 * "Fragment Reassembly Timeout" message, per RFC792.
235 if (frag_expire_skip_icmp(qp
->user
) &&
236 (skb_rtable(head
)->rt_type
!= RTN_LOCAL
))
239 clone
= skb_clone(head
, GFP_ATOMIC
);
241 /* Send an ICMP "Fragment Reassembly Timeout" message. */
243 spin_unlock(&qp
->q
.lock
);
244 icmp_send(clone
, ICMP_TIME_EXCEEDED
,
245 ICMP_EXC_FRAGTIME
, 0);
251 spin_unlock(&qp
->q
.lock
);
257 /* Find the correct entry in the "incomplete datagrams" queue for
258 * this IP datagram, and create new one, if nothing is found.
260 static struct ipq
*ip_find(struct net
*net
, struct iphdr
*iph
,
263 struct inet_frag_queue
*q
;
264 struct ip4_create_arg arg
;
271 hash
= ipqhashfn(iph
->id
, iph
->saddr
, iph
->daddr
, iph
->protocol
);
273 q
= inet_frag_find(&net
->ipv4
.frags
, &ip4_frags
, &arg
, hash
);
274 if (IS_ERR_OR_NULL(q
)) {
275 inet_frag_maybe_warn_overflow(q
, pr_fmt());
278 return container_of(q
, struct ipq
, q
);
281 /* Is the fragment too far ahead to be part of ipq? */
282 static int ip_frag_too_far(struct ipq
*qp
)
284 struct inet_peer
*peer
= qp
->peer
;
285 unsigned int max
= qp
->q
.net
->max_dist
;
286 unsigned int start
, end
;
294 end
= atomic_inc_return(&peer
->rid
);
297 rc
= qp
->q
.fragments
&& (end
- start
) > max
;
302 net
= container_of(qp
->q
.net
, struct net
, ipv4
.frags
);
303 __IP_INC_STATS(net
, IPSTATS_MIB_REASMFAILS
);
309 static int ip_frag_reinit(struct ipq
*qp
)
312 unsigned int sum_truesize
= 0;
314 if (!mod_timer(&qp
->q
.timer
, jiffies
+ qp
->q
.net
->timeout
)) {
315 atomic_inc(&qp
->q
.refcnt
);
319 fp
= qp
->q
.fragments
;
321 struct sk_buff
*xp
= fp
->next
;
323 sum_truesize
+= fp
->truesize
;
327 sub_frag_mem_limit(qp
->q
.net
, sum_truesize
);
332 qp
->q
.fragments
= NULL
;
333 qp
->q
.fragments_tail
= NULL
;
340 /* Add new segment to existing queue. */
341 static int ip_frag_queue(struct ipq
*qp
, struct sk_buff
*skb
)
343 struct sk_buff
*prev
, *next
;
344 struct net_device
*dev
;
345 unsigned int fragsize
;
351 if (qp
->q
.flags
& INET_FRAG_COMPLETE
)
354 if (!(IPCB(skb
)->flags
& IPSKB_FRAG_COMPLETE
) &&
355 unlikely(ip_frag_too_far(qp
)) &&
356 unlikely(err
= ip_frag_reinit(qp
))) {
361 ecn
= ip4_frag_ecn(ip_hdr(skb
)->tos
);
362 offset
= ntohs(ip_hdr(skb
)->frag_off
);
363 flags
= offset
& ~IP_OFFSET
;
365 offset
<<= 3; /* offset is in 8-byte chunks */
366 ihl
= ip_hdrlen(skb
);
368 /* Determine the position of this fragment. */
369 end
= offset
+ skb
->len
- skb_network_offset(skb
) - ihl
;
372 /* Is this the final fragment? */
373 if ((flags
& IP_MF
) == 0) {
374 /* If we already have some bits beyond end
375 * or have different end, the segment is corrupted.
377 if (end
< qp
->q
.len
||
378 ((qp
->q
.flags
& INET_FRAG_LAST_IN
) && end
!= qp
->q
.len
))
380 qp
->q
.flags
|= INET_FRAG_LAST_IN
;
385 if (skb
->ip_summed
!= CHECKSUM_UNNECESSARY
)
386 skb
->ip_summed
= CHECKSUM_NONE
;
388 if (end
> qp
->q
.len
) {
389 /* Some bits beyond end -> corruption. */
390 if (qp
->q
.flags
& INET_FRAG_LAST_IN
)
399 if (!pskb_pull(skb
, skb_network_offset(skb
) + ihl
))
402 err
= pskb_trim_rcsum(skb
, end
- offset
);
406 /* Find out which fragments are in front and at the back of us
407 * in the chain of fragments so far. We must know where to put
408 * this fragment, right?
410 prev
= qp
->q
.fragments_tail
;
411 if (!prev
|| FRAG_CB(prev
)->offset
< offset
) {
416 for (next
= qp
->q
.fragments
; next
!= NULL
; next
= next
->next
) {
417 if (FRAG_CB(next
)->offset
>= offset
)
423 /* We found where to put this one. Check for overlap with
424 * preceding fragment, and, if needed, align things so that
425 * any overlaps are eliminated.
428 int i
= (FRAG_CB(prev
)->offset
+ prev
->len
) - offset
;
436 if (!pskb_pull(skb
, i
))
438 if (skb
->ip_summed
!= CHECKSUM_UNNECESSARY
)
439 skb
->ip_summed
= CHECKSUM_NONE
;
445 while (next
&& FRAG_CB(next
)->offset
< end
) {
446 int i
= end
- FRAG_CB(next
)->offset
; /* overlap is 'i' bytes */
449 /* Eat head of the next overlapped fragment
450 * and leave the loop. The next ones cannot overlap.
452 if (!pskb_pull(next
, i
))
454 FRAG_CB(next
)->offset
+= i
;
456 if (next
->ip_summed
!= CHECKSUM_UNNECESSARY
)
457 next
->ip_summed
= CHECKSUM_NONE
;
460 struct sk_buff
*free_it
= next
;
462 /* Old fragment is completely overridden with
470 qp
->q
.fragments
= next
;
472 qp
->q
.meat
-= free_it
->len
;
473 sub_frag_mem_limit(qp
->q
.net
, free_it
->truesize
);
478 FRAG_CB(skb
)->offset
= offset
;
480 /* Insert this fragment in the chain of fragments. */
483 qp
->q
.fragments_tail
= skb
;
487 qp
->q
.fragments
= skb
;
491 qp
->iif
= dev
->ifindex
;
494 qp
->q
.stamp
= skb
->tstamp
;
495 qp
->q
.meat
+= skb
->len
;
497 add_frag_mem_limit(qp
->q
.net
, skb
->truesize
);
499 qp
->q
.flags
|= INET_FRAG_FIRST_IN
;
501 fragsize
= skb
->len
+ ihl
;
503 if (fragsize
> qp
->q
.max_size
)
504 qp
->q
.max_size
= fragsize
;
506 if (ip_hdr(skb
)->frag_off
& htons(IP_DF
) &&
507 fragsize
> qp
->max_df_size
)
508 qp
->max_df_size
= fragsize
;
510 if (qp
->q
.flags
== (INET_FRAG_FIRST_IN
| INET_FRAG_LAST_IN
) &&
511 qp
->q
.meat
== qp
->q
.len
) {
512 unsigned long orefdst
= skb
->_skb_refdst
;
514 skb
->_skb_refdst
= 0UL;
515 err
= ip_frag_reasm(qp
, prev
, dev
);
516 skb
->_skb_refdst
= orefdst
;
529 /* Build a new IP datagram from all its fragments. */
531 static int ip_frag_reasm(struct ipq
*qp
, struct sk_buff
*prev
,
532 struct net_device
*dev
)
534 struct net
*net
= container_of(qp
->q
.net
, struct net
, ipv4
.frags
);
536 struct sk_buff
*fp
, *head
= qp
->q
.fragments
;
544 ecn
= ip_frag_ecn_table
[qp
->ecn
];
545 if (unlikely(ecn
== 0xff)) {
549 /* Make the one we just received the head. */
552 fp
= skb_clone(head
, GFP_ATOMIC
);
556 fp
->next
= head
->next
;
558 qp
->q
.fragments_tail
= fp
;
561 skb_morph(head
, qp
->q
.fragments
);
562 head
->next
= qp
->q
.fragments
->next
;
564 consume_skb(qp
->q
.fragments
);
565 qp
->q
.fragments
= head
;
569 WARN_ON(FRAG_CB(head
)->offset
!= 0);
571 /* Allocate a new buffer for the datagram. */
572 ihlen
= ip_hdrlen(head
);
573 len
= ihlen
+ qp
->q
.len
;
579 /* Head of list must not be cloned. */
580 if (skb_unclone(head
, GFP_ATOMIC
))
583 /* If the first fragment is fragmented itself, we split
584 * it to two chunks: the first with data and paged part
585 * and the second, holding only fragments. */
586 if (skb_has_frag_list(head
)) {
587 struct sk_buff
*clone
;
590 clone
= alloc_skb(0, GFP_ATOMIC
);
593 clone
->next
= head
->next
;
595 skb_shinfo(clone
)->frag_list
= skb_shinfo(head
)->frag_list
;
596 skb_frag_list_init(head
);
597 for (i
= 0; i
< skb_shinfo(head
)->nr_frags
; i
++)
598 plen
+= skb_frag_size(&skb_shinfo(head
)->frags
[i
]);
599 clone
->len
= clone
->data_len
= head
->data_len
- plen
;
600 head
->data_len
-= clone
->len
;
601 head
->len
-= clone
->len
;
603 clone
->ip_summed
= head
->ip_summed
;
604 add_frag_mem_limit(qp
->q
.net
, clone
->truesize
);
607 skb_shinfo(head
)->frag_list
= head
->next
;
608 skb_push(head
, head
->data
- skb_network_header(head
));
610 for (fp
=head
->next
; fp
; fp
= fp
->next
) {
611 head
->data_len
+= fp
->len
;
612 head
->len
+= fp
->len
;
613 if (head
->ip_summed
!= fp
->ip_summed
)
614 head
->ip_summed
= CHECKSUM_NONE
;
615 else if (head
->ip_summed
== CHECKSUM_COMPLETE
)
616 head
->csum
= csum_add(head
->csum
, fp
->csum
);
617 head
->truesize
+= fp
->truesize
;
619 sub_frag_mem_limit(qp
->q
.net
, head
->truesize
);
623 head
->tstamp
= qp
->q
.stamp
;
624 IPCB(head
)->frag_max_size
= max(qp
->max_df_size
, qp
->q
.max_size
);
627 iph
->tot_len
= htons(len
);
630 /* When we set IP_DF on a refragmented skb we must also force a
631 * call to ip_fragment to avoid forwarding a DF-skb of size s while
632 * original sender only sent fragments of size f (where f < s).
634 * We only set DF/IPSKB_FRAG_PMTU if such DF fragment was the largest
635 * frag seen to avoid sending tiny DF-fragments in case skb was built
636 * from one very small df-fragment and one large non-df frag.
638 if (qp
->max_df_size
== qp
->q
.max_size
) {
639 IPCB(head
)->flags
|= IPSKB_FRAG_PMTU
;
640 iph
->frag_off
= htons(IP_DF
);
647 __IP_INC_STATS(net
, IPSTATS_MIB_REASMOKS
);
648 qp
->q
.fragments
= NULL
;
649 qp
->q
.fragments_tail
= NULL
;
653 net_dbg_ratelimited("queue_glue: no memory for gluing queue %p\n", qp
);
657 net_info_ratelimited("Oversized IP packet from %pI4\n", &qp
->saddr
);
659 __IP_INC_STATS(net
, IPSTATS_MIB_REASMFAILS
);
663 /* Process an incoming IP datagram fragment. */
664 int ip_defrag(struct net
*net
, struct sk_buff
*skb
, u32 user
)
666 struct net_device
*dev
= skb
->dev
? : skb_dst(skb
)->dev
;
667 int vif
= l3mdev_master_ifindex_rcu(dev
);
670 __IP_INC_STATS(net
, IPSTATS_MIB_REASMREQDS
);
673 /* Lookup (or create) queue header */
674 qp
= ip_find(net
, ip_hdr(skb
), user
, vif
);
678 spin_lock(&qp
->q
.lock
);
680 ret
= ip_frag_queue(qp
, skb
);
682 spin_unlock(&qp
->q
.lock
);
687 __IP_INC_STATS(net
, IPSTATS_MIB_REASMFAILS
);
691 EXPORT_SYMBOL(ip_defrag
);
693 struct sk_buff
*ip_check_defrag(struct net
*net
, struct sk_buff
*skb
, u32 user
)
699 if (skb
->protocol
!= htons(ETH_P_IP
))
702 netoff
= skb_network_offset(skb
);
704 if (skb_copy_bits(skb
, netoff
, &iph
, sizeof(iph
)) < 0)
707 if (iph
.ihl
< 5 || iph
.version
!= 4)
710 len
= ntohs(iph
.tot_len
);
711 if (skb
->len
< netoff
+ len
|| len
< (iph
.ihl
* 4))
714 if (ip_is_fragment(&iph
)) {
715 skb
= skb_share_check(skb
, GFP_ATOMIC
);
717 if (!pskb_may_pull(skb
, netoff
+ iph
.ihl
* 4))
719 if (pskb_trim_rcsum(skb
, netoff
+ len
))
721 memset(IPCB(skb
), 0, sizeof(struct inet_skb_parm
));
722 if (ip_defrag(net
, skb
, user
))
729 EXPORT_SYMBOL(ip_check_defrag
);
734 static struct ctl_table ip4_frags_ns_ctl_table
[] = {
736 .procname
= "ipfrag_high_thresh",
737 .data
= &init_net
.ipv4
.frags
.high_thresh
,
738 .maxlen
= sizeof(int),
740 .proc_handler
= proc_dointvec_minmax
,
741 .extra1
= &init_net
.ipv4
.frags
.low_thresh
744 .procname
= "ipfrag_low_thresh",
745 .data
= &init_net
.ipv4
.frags
.low_thresh
,
746 .maxlen
= sizeof(int),
748 .proc_handler
= proc_dointvec_minmax
,
750 .extra2
= &init_net
.ipv4
.frags
.high_thresh
753 .procname
= "ipfrag_time",
754 .data
= &init_net
.ipv4
.frags
.timeout
,
755 .maxlen
= sizeof(int),
757 .proc_handler
= proc_dointvec_jiffies
,
760 .procname
= "ipfrag_max_dist",
761 .data
= &init_net
.ipv4
.frags
.max_dist
,
762 .maxlen
= sizeof(int),
764 .proc_handler
= proc_dointvec_minmax
,
770 /* secret interval has been deprecated */
771 static int ip4_frags_secret_interval_unused
;
772 static struct ctl_table ip4_frags_ctl_table
[] = {
774 .procname
= "ipfrag_secret_interval",
775 .data
= &ip4_frags_secret_interval_unused
,
776 .maxlen
= sizeof(int),
778 .proc_handler
= proc_dointvec_jiffies
,
783 static int __net_init
ip4_frags_ns_ctl_register(struct net
*net
)
785 struct ctl_table
*table
;
786 struct ctl_table_header
*hdr
;
788 table
= ip4_frags_ns_ctl_table
;
789 if (!net_eq(net
, &init_net
)) {
790 table
= kmemdup(table
, sizeof(ip4_frags_ns_ctl_table
), GFP_KERNEL
);
794 table
[0].data
= &net
->ipv4
.frags
.high_thresh
;
795 table
[0].extra1
= &net
->ipv4
.frags
.low_thresh
;
796 table
[0].extra2
= &init_net
.ipv4
.frags
.high_thresh
;
797 table
[1].data
= &net
->ipv4
.frags
.low_thresh
;
798 table
[1].extra2
= &net
->ipv4
.frags
.high_thresh
;
799 table
[2].data
= &net
->ipv4
.frags
.timeout
;
800 table
[3].data
= &net
->ipv4
.frags
.max_dist
;
803 hdr
= register_net_sysctl(net
, "net/ipv4", table
);
807 net
->ipv4
.frags_hdr
= hdr
;
811 if (!net_eq(net
, &init_net
))
817 static void __net_exit
ip4_frags_ns_ctl_unregister(struct net
*net
)
819 struct ctl_table
*table
;
821 table
= net
->ipv4
.frags_hdr
->ctl_table_arg
;
822 unregister_net_sysctl_table(net
->ipv4
.frags_hdr
);
826 static void __init
ip4_frags_ctl_register(void)
828 register_net_sysctl(&init_net
, "net/ipv4", ip4_frags_ctl_table
);
831 static int ip4_frags_ns_ctl_register(struct net
*net
)
836 static void ip4_frags_ns_ctl_unregister(struct net
*net
)
840 static void __init
ip4_frags_ctl_register(void)
845 static int __net_init
ipv4_frags_init_net(struct net
*net
)
849 /* Fragment cache limits.
851 * The fragment memory accounting code, (tries to) account for
852 * the real memory usage, by measuring both the size of frag
853 * queue struct (inet_frag_queue (ipv4:ipq/ipv6:frag_queue))
854 * and the SKB's truesize.
856 * A 64K fragment consumes 129736 bytes (44*2944)+200
857 * (1500 truesize == 2944, sizeof(struct ipq) == 200)
859 * We will commit 4MB at one time. Should we cross that limit
860 * we will prune down to 3MB, making room for approx 8 big 64K
863 net
->ipv4
.frags
.high_thresh
= 4 * 1024 * 1024;
864 net
->ipv4
.frags
.low_thresh
= 3 * 1024 * 1024;
866 * Important NOTE! Fragment queue must be destroyed before MSL expires.
867 * RFC791 is wrong proposing to prolongate timer each fragment arrival
870 net
->ipv4
.frags
.timeout
= IP_FRAG_TIME
;
872 net
->ipv4
.frags
.max_dist
= 64;
874 res
= inet_frags_init_net(&net
->ipv4
.frags
);
877 res
= ip4_frags_ns_ctl_register(net
);
879 inet_frags_uninit_net(&net
->ipv4
.frags
);
883 static void __net_exit
ipv4_frags_exit_net(struct net
*net
)
885 ip4_frags_ns_ctl_unregister(net
);
886 inet_frags_exit_net(&net
->ipv4
.frags
, &ip4_frags
);
889 static struct pernet_operations ip4_frags_ops
= {
890 .init
= ipv4_frags_init_net
,
891 .exit
= ipv4_frags_exit_net
,
894 void __init
ipfrag_init(void)
896 ip4_frags_ctl_register();
897 register_pernet_subsys(&ip4_frags_ops
);
898 ip4_frags
.hashfn
= ip4_hashfn
;
899 ip4_frags
.constructor
= ip4_frag_init
;
900 ip4_frags
.destructor
= ip4_frag_free
;
901 ip4_frags
.qsize
= sizeof(struct ipq
);
902 ip4_frags
.match
= ip4_frag_match
;
903 ip4_frags
.frag_expire
= ip_expire
;
904 ip4_frags
.frags_cache_name
= ip_frag_cache_name
;
905 if (inet_frags_init(&ip4_frags
))
906 panic("IP: failed to allocate ip4_frags cache\n");