2 * IPv6 output functions
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/net/ipv4/ip_output.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.
16 * A.N.Kuznetsov : airthmetics in fragmentation.
17 * extension headers are implemented.
18 * route changes now work.
19 * ip6_forward does not confuse sniffers.
22 * H. von Brand : Added missing #include <linux/string.h>
23 * Imran Patel : frag id should be in NBO
24 * Kazunori MIYAZAWA @USAGI
25 * : add ip6_append_data and related functions
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/string.h>
32 #include <linux/socket.h>
33 #include <linux/net.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/in6.h>
37 #include <linux/tcp.h>
38 #include <linux/route.h>
39 #include <linux/module.h>
40 #include <linux/slab.h>
42 #include <linux/netfilter.h>
43 #include <linux/netfilter_ipv6.h>
49 #include <net/ndisc.h>
50 #include <net/protocol.h>
51 #include <net/ip6_route.h>
52 #include <net/addrconf.h>
53 #include <net/rawv6.h>
56 #include <net/checksum.h>
57 #include <linux/mroute6.h>
59 int ip6_fragment(struct sk_buff
*skb
, int (*output
)(struct sk_buff
*));
61 int __ip6_local_out(struct sk_buff
*skb
)
65 len
= skb
->len
- sizeof(struct ipv6hdr
);
66 if (len
> IPV6_MAXPLEN
)
68 ipv6_hdr(skb
)->payload_len
= htons(len
);
70 return nf_hook(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, skb
, NULL
,
71 skb_dst(skb
)->dev
, dst_output
);
74 int ip6_local_out(struct sk_buff
*skb
)
78 err
= __ip6_local_out(skb
);
80 err
= dst_output(skb
);
84 EXPORT_SYMBOL_GPL(ip6_local_out
);
86 /* dev_loopback_xmit for use with netfilter. */
87 static int ip6_dev_loopback_xmit(struct sk_buff
*newskb
)
89 skb_reset_mac_header(newskb
);
90 __skb_pull(newskb
, skb_network_offset(newskb
));
91 newskb
->pkt_type
= PACKET_LOOPBACK
;
92 newskb
->ip_summed
= CHECKSUM_UNNECESSARY
;
93 WARN_ON(!skb_dst(newskb
));
99 static int ip6_finish_output2(struct sk_buff
*skb
)
101 struct dst_entry
*dst
= skb_dst(skb
);
102 struct net_device
*dev
= dst
->dev
;
104 skb
->protocol
= htons(ETH_P_IPV6
);
107 if (ipv6_addr_is_multicast(&ipv6_hdr(skb
)->daddr
)) {
108 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
110 if (!(dev
->flags
& IFF_LOOPBACK
) && sk_mc_loop(skb
->sk
) &&
111 ((mroute6_socket(dev_net(dev
), skb
) &&
112 !(IP6CB(skb
)->flags
& IP6SKB_FORWARDED
)) ||
113 ipv6_chk_mcast_addr(dev
, &ipv6_hdr(skb
)->daddr
,
114 &ipv6_hdr(skb
)->saddr
))) {
115 struct sk_buff
*newskb
= skb_clone(skb
, GFP_ATOMIC
);
117 /* Do not check for IFF_ALLMULTI; multicast routing
118 is not supported in any case.
121 NF_HOOK(NFPROTO_IPV6
, NF_INET_POST_ROUTING
,
122 newskb
, NULL
, newskb
->dev
,
123 ip6_dev_loopback_xmit
);
125 if (ipv6_hdr(skb
)->hop_limit
== 0) {
126 IP6_INC_STATS(dev_net(dev
), idev
,
127 IPSTATS_MIB_OUTDISCARDS
);
133 IP6_UPD_PO_STATS(dev_net(dev
), idev
, IPSTATS_MIB_OUTMCAST
,
138 return neigh_hh_output(dst
->hh
, skb
);
139 else if (dst
->neighbour
)
140 return dst
->neighbour
->output(skb
);
142 IP6_INC_STATS_BH(dev_net(dst
->dev
),
143 ip6_dst_idev(dst
), IPSTATS_MIB_OUTNOROUTES
);
148 static int ip6_finish_output(struct sk_buff
*skb
)
150 if ((skb
->len
> ip6_skb_dst_mtu(skb
) && !skb_is_gso(skb
)) ||
151 dst_allfrag(skb_dst(skb
)))
152 return ip6_fragment(skb
, ip6_finish_output2
);
154 return ip6_finish_output2(skb
);
157 int ip6_output(struct sk_buff
*skb
)
159 struct net_device
*dev
= skb_dst(skb
)->dev
;
160 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
161 if (unlikely(idev
->cnf
.disable_ipv6
)) {
162 IP6_INC_STATS(dev_net(dev
), idev
,
163 IPSTATS_MIB_OUTDISCARDS
);
168 return NF_HOOK_COND(NFPROTO_IPV6
, NF_INET_POST_ROUTING
, skb
, NULL
, dev
,
170 !(IP6CB(skb
)->flags
& IP6SKB_REROUTED
));
174 * xmit an sk_buff (used by TCP, SCTP and DCCP)
177 int ip6_xmit(struct sock
*sk
, struct sk_buff
*skb
, struct flowi
*fl
,
178 struct ipv6_txoptions
*opt
)
180 struct net
*net
= sock_net(sk
);
181 struct ipv6_pinfo
*np
= inet6_sk(sk
);
182 struct in6_addr
*first_hop
= &fl
->fl6_dst
;
183 struct dst_entry
*dst
= skb_dst(skb
);
185 u8 proto
= fl
->proto
;
186 int seg_len
= skb
->len
;
192 unsigned int head_room
;
194 /* First: exthdrs may take lots of space (~8K for now)
195 MAX_HEADER is not enough.
197 head_room
= opt
->opt_nflen
+ opt
->opt_flen
;
198 seg_len
+= head_room
;
199 head_room
+= sizeof(struct ipv6hdr
) + LL_RESERVED_SPACE(dst
->dev
);
201 if (skb_headroom(skb
) < head_room
) {
202 struct sk_buff
*skb2
= skb_realloc_headroom(skb
, head_room
);
204 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
205 IPSTATS_MIB_OUTDISCARDS
);
211 skb_set_owner_w(skb
, sk
);
214 ipv6_push_frag_opts(skb
, opt
, &proto
);
216 ipv6_push_nfrag_opts(skb
, opt
, &proto
, &first_hop
);
219 skb_push(skb
, sizeof(struct ipv6hdr
));
220 skb_reset_network_header(skb
);
224 * Fill in the IPv6 header
228 hlimit
= np
->hop_limit
;
231 hlimit
= ip6_dst_hoplimit(dst
);
233 *(__be32
*)hdr
= htonl(0x60000000 | (tclass
<< 20)) | fl
->fl6_flowlabel
;
235 hdr
->payload_len
= htons(seg_len
);
236 hdr
->nexthdr
= proto
;
237 hdr
->hop_limit
= hlimit
;
239 ipv6_addr_copy(&hdr
->saddr
, &fl
->fl6_src
);
240 ipv6_addr_copy(&hdr
->daddr
, first_hop
);
242 skb
->priority
= sk
->sk_priority
;
243 skb
->mark
= sk
->sk_mark
;
246 if ((skb
->len
<= mtu
) || skb
->local_df
|| skb_is_gso(skb
)) {
247 IP6_UPD_PO_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
248 IPSTATS_MIB_OUT
, skb
->len
);
249 return NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, skb
, NULL
,
250 dst
->dev
, dst_output
);
254 printk(KERN_DEBUG
"IPv6: sending pkt_too_big to self\n");
256 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
257 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_FRAGFAILS
);
262 EXPORT_SYMBOL(ip6_xmit
);
265 * To avoid extra problems ND packets are send through this
266 * routine. It's code duplication but I really want to avoid
267 * extra checks since ipv6_build_header is used by TCP (which
268 * is for us performance critical)
271 int ip6_nd_hdr(struct sock
*sk
, struct sk_buff
*skb
, struct net_device
*dev
,
272 const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
275 struct ipv6_pinfo
*np
= inet6_sk(sk
);
278 skb
->protocol
= htons(ETH_P_IPV6
);
281 skb_reset_network_header(skb
);
282 skb_put(skb
, sizeof(struct ipv6hdr
));
285 *(__be32
*)hdr
= htonl(0x60000000);
287 hdr
->payload_len
= htons(len
);
288 hdr
->nexthdr
= proto
;
289 hdr
->hop_limit
= np
->hop_limit
;
291 ipv6_addr_copy(&hdr
->saddr
, saddr
);
292 ipv6_addr_copy(&hdr
->daddr
, daddr
);
297 static int ip6_call_ra_chain(struct sk_buff
*skb
, int sel
)
299 struct ip6_ra_chain
*ra
;
300 struct sock
*last
= NULL
;
302 read_lock(&ip6_ra_lock
);
303 for (ra
= ip6_ra_chain
; ra
; ra
= ra
->next
) {
304 struct sock
*sk
= ra
->sk
;
305 if (sk
&& ra
->sel
== sel
&&
306 (!sk
->sk_bound_dev_if
||
307 sk
->sk_bound_dev_if
== skb
->dev
->ifindex
)) {
309 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
311 rawv6_rcv(last
, skb2
);
318 rawv6_rcv(last
, skb
);
319 read_unlock(&ip6_ra_lock
);
322 read_unlock(&ip6_ra_lock
);
326 static int ip6_forward_proxy_check(struct sk_buff
*skb
)
328 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
329 u8 nexthdr
= hdr
->nexthdr
;
332 if (ipv6_ext_hdr(nexthdr
)) {
333 offset
= ipv6_skip_exthdr(skb
, sizeof(*hdr
), &nexthdr
);
337 offset
= sizeof(struct ipv6hdr
);
339 if (nexthdr
== IPPROTO_ICMPV6
) {
340 struct icmp6hdr
*icmp6
;
342 if (!pskb_may_pull(skb
, (skb_network_header(skb
) +
343 offset
+ 1 - skb
->data
)))
346 icmp6
= (struct icmp6hdr
*)(skb_network_header(skb
) + offset
);
348 switch (icmp6
->icmp6_type
) {
349 case NDISC_ROUTER_SOLICITATION
:
350 case NDISC_ROUTER_ADVERTISEMENT
:
351 case NDISC_NEIGHBOUR_SOLICITATION
:
352 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
354 /* For reaction involving unicast neighbor discovery
355 * message destined to the proxied address, pass it to
365 * The proxying router can't forward traffic sent to a link-local
366 * address, so signal the sender and discard the packet. This
367 * behavior is clarified by the MIPv6 specification.
369 if (ipv6_addr_type(&hdr
->daddr
) & IPV6_ADDR_LINKLOCAL
) {
370 dst_link_failure(skb
);
377 static inline int ip6_forward_finish(struct sk_buff
*skb
)
379 return dst_output(skb
);
382 int ip6_forward(struct sk_buff
*skb
)
384 struct dst_entry
*dst
= skb_dst(skb
);
385 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
386 struct inet6_skb_parm
*opt
= IP6CB(skb
);
387 struct net
*net
= dev_net(dst
->dev
);
390 if (net
->ipv6
.devconf_all
->forwarding
== 0)
393 if (skb_warn_if_lro(skb
))
396 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_FWD
, skb
)) {
397 IP6_INC_STATS(net
, ip6_dst_idev(dst
), IPSTATS_MIB_INDISCARDS
);
401 if (skb
->pkt_type
!= PACKET_HOST
)
404 skb_forward_csum(skb
);
407 * We DO NOT make any processing on
408 * RA packets, pushing them to user level AS IS
409 * without ane WARRANTY that application will be able
410 * to interpret them. The reason is that we
411 * cannot make anything clever here.
413 * We are not end-node, so that if packet contains
414 * AH/ESP, we cannot make anything.
415 * Defragmentation also would be mistake, RA packets
416 * cannot be fragmented, because there is no warranty
417 * that different fragments will go along one path. --ANK
420 u8
*ptr
= skb_network_header(skb
) + opt
->ra
;
421 if (ip6_call_ra_chain(skb
, (ptr
[2]<<8) + ptr
[3]))
426 * check and decrement ttl
428 if (hdr
->hop_limit
<= 1) {
429 /* Force OUTPUT device used as source address */
431 icmpv6_send(skb
, ICMPV6_TIME_EXCEED
, ICMPV6_EXC_HOPLIMIT
, 0);
432 IP6_INC_STATS_BH(net
,
433 ip6_dst_idev(dst
), IPSTATS_MIB_INHDRERRORS
);
439 /* XXX: idev->cnf.proxy_ndp? */
440 if (net
->ipv6
.devconf_all
->proxy_ndp
&&
441 pneigh_lookup(&nd_tbl
, net
, &hdr
->daddr
, skb
->dev
, 0)) {
442 int proxied
= ip6_forward_proxy_check(skb
);
444 return ip6_input(skb
);
445 else if (proxied
< 0) {
446 IP6_INC_STATS(net
, ip6_dst_idev(dst
),
447 IPSTATS_MIB_INDISCARDS
);
452 if (!xfrm6_route_forward(skb
)) {
453 IP6_INC_STATS(net
, ip6_dst_idev(dst
), IPSTATS_MIB_INDISCARDS
);
458 /* IPv6 specs say nothing about it, but it is clear that we cannot
459 send redirects to source routed frames.
460 We don't send redirects to frames decapsulated from IPsec.
462 if (skb
->dev
== dst
->dev
&& dst
->neighbour
&& opt
->srcrt
== 0 &&
463 !skb_sec_path(skb
)) {
464 struct in6_addr
*target
= NULL
;
466 struct neighbour
*n
= dst
->neighbour
;
469 * incoming and outgoing devices are the same
473 rt
= (struct rt6_info
*) dst
;
474 if ((rt
->rt6i_flags
& RTF_GATEWAY
))
475 target
= (struct in6_addr
*)&n
->primary_key
;
477 target
= &hdr
->daddr
;
480 rt6_bind_peer(rt
, 1);
482 /* Limit redirects both by destination (here)
483 and by source (inside ndisc_send_redirect)
485 if (inet_peer_xrlim_allow(rt
->rt6i_peer
, 1*HZ
))
486 ndisc_send_redirect(skb
, n
, target
);
488 int addrtype
= ipv6_addr_type(&hdr
->saddr
);
490 /* This check is security critical. */
491 if (addrtype
== IPV6_ADDR_ANY
||
492 addrtype
& (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LOOPBACK
))
494 if (addrtype
& IPV6_ADDR_LINKLOCAL
) {
495 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
,
496 ICMPV6_NOT_NEIGHBOUR
, 0);
502 if (mtu
< IPV6_MIN_MTU
)
505 if (skb
->len
> mtu
&& !skb_is_gso(skb
)) {
506 /* Again, force OUTPUT device used as source address */
508 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
509 IP6_INC_STATS_BH(net
,
510 ip6_dst_idev(dst
), IPSTATS_MIB_INTOOBIGERRORS
);
511 IP6_INC_STATS_BH(net
,
512 ip6_dst_idev(dst
), IPSTATS_MIB_FRAGFAILS
);
517 if (skb_cow(skb
, dst
->dev
->hard_header_len
)) {
518 IP6_INC_STATS(net
, ip6_dst_idev(dst
), IPSTATS_MIB_OUTDISCARDS
);
524 /* Mangling hops number delayed to point after skb COW */
528 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
), IPSTATS_MIB_OUTFORWDATAGRAMS
);
529 return NF_HOOK(NFPROTO_IPV6
, NF_INET_FORWARD
, skb
, skb
->dev
, dst
->dev
,
533 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
), IPSTATS_MIB_INADDRERRORS
);
539 static void ip6_copy_metadata(struct sk_buff
*to
, struct sk_buff
*from
)
541 to
->pkt_type
= from
->pkt_type
;
542 to
->priority
= from
->priority
;
543 to
->protocol
= from
->protocol
;
545 skb_dst_set(to
, dst_clone(skb_dst(from
)));
547 to
->mark
= from
->mark
;
549 #ifdef CONFIG_NET_SCHED
550 to
->tc_index
= from
->tc_index
;
553 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
554 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
555 to
->nf_trace
= from
->nf_trace
;
557 skb_copy_secmark(to
, from
);
560 int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
)
562 u16 offset
= sizeof(struct ipv6hdr
);
563 struct ipv6_opt_hdr
*exthdr
=
564 (struct ipv6_opt_hdr
*)(ipv6_hdr(skb
) + 1);
565 unsigned int packet_len
= skb
->tail
- skb
->network_header
;
567 *nexthdr
= &ipv6_hdr(skb
)->nexthdr
;
569 while (offset
+ 1 <= packet_len
) {
575 case NEXTHDR_ROUTING
:
579 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
580 if (ipv6_find_tlv(skb
, offset
, IPV6_TLV_HAO
) >= 0)
590 offset
+= ipv6_optlen(exthdr
);
591 *nexthdr
= &exthdr
->nexthdr
;
592 exthdr
= (struct ipv6_opt_hdr
*)(skb_network_header(skb
) +
599 int ip6_fragment(struct sk_buff
*skb
, int (*output
)(struct sk_buff
*))
601 struct sk_buff
*frag
;
602 struct rt6_info
*rt
= (struct rt6_info
*)skb_dst(skb
);
603 struct ipv6_pinfo
*np
= skb
->sk
? inet6_sk(skb
->sk
) : NULL
;
604 struct ipv6hdr
*tmp_hdr
;
606 unsigned int mtu
, hlen
, left
, len
;
608 int ptr
, offset
= 0, err
=0;
609 u8
*prevhdr
, nexthdr
= 0;
610 struct net
*net
= dev_net(skb_dst(skb
)->dev
);
612 hlen
= ip6_find_1stfragopt(skb
, &prevhdr
);
615 mtu
= ip6_skb_dst_mtu(skb
);
617 /* We must not fragment if the socket is set to force MTU discovery
618 * or if the skb it not generated by a local socket.
620 if (!skb
->local_df
&& skb
->len
> mtu
) {
621 skb
->dev
= skb_dst(skb
)->dev
;
622 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
623 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
624 IPSTATS_MIB_FRAGFAILS
);
629 if (np
&& np
->frag_size
< mtu
) {
633 mtu
-= hlen
+ sizeof(struct frag_hdr
);
635 if (skb_has_frag_list(skb
)) {
636 int first_len
= skb_pagelen(skb
);
637 struct sk_buff
*frag2
;
639 if (first_len
- hlen
> mtu
||
640 ((first_len
- hlen
) & 7) ||
644 skb_walk_frags(skb
, frag
) {
645 /* Correct geometry. */
646 if (frag
->len
> mtu
||
647 ((frag
->len
& 7) && frag
->next
) ||
648 skb_headroom(frag
) < hlen
)
649 goto slow_path_clean
;
651 /* Partially cloned skb? */
652 if (skb_shared(frag
))
653 goto slow_path_clean
;
658 frag
->destructor
= sock_wfree
;
660 skb
->truesize
-= frag
->truesize
;
665 frag
= skb_shinfo(skb
)->frag_list
;
666 skb_frag_list_init(skb
);
669 *prevhdr
= NEXTHDR_FRAGMENT
;
670 tmp_hdr
= kmemdup(skb_network_header(skb
), hlen
, GFP_ATOMIC
);
672 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
673 IPSTATS_MIB_FRAGFAILS
);
677 __skb_pull(skb
, hlen
);
678 fh
= (struct frag_hdr
*)__skb_push(skb
, sizeof(struct frag_hdr
));
679 __skb_push(skb
, hlen
);
680 skb_reset_network_header(skb
);
681 memcpy(skb_network_header(skb
), tmp_hdr
, hlen
);
683 ipv6_select_ident(fh
);
684 fh
->nexthdr
= nexthdr
;
686 fh
->frag_off
= htons(IP6_MF
);
687 frag_id
= fh
->identification
;
689 first_len
= skb_pagelen(skb
);
690 skb
->data_len
= first_len
- skb_headlen(skb
);
691 skb
->len
= first_len
;
692 ipv6_hdr(skb
)->payload_len
= htons(first_len
-
693 sizeof(struct ipv6hdr
));
698 /* Prepare header of the next frame,
699 * before previous one went down. */
701 frag
->ip_summed
= CHECKSUM_NONE
;
702 skb_reset_transport_header(frag
);
703 fh
= (struct frag_hdr
*)__skb_push(frag
, sizeof(struct frag_hdr
));
704 __skb_push(frag
, hlen
);
705 skb_reset_network_header(frag
);
706 memcpy(skb_network_header(frag
), tmp_hdr
,
708 offset
+= skb
->len
- hlen
- sizeof(struct frag_hdr
);
709 fh
->nexthdr
= nexthdr
;
711 fh
->frag_off
= htons(offset
);
712 if (frag
->next
!= NULL
)
713 fh
->frag_off
|= htons(IP6_MF
);
714 fh
->identification
= frag_id
;
715 ipv6_hdr(frag
)->payload_len
=
717 sizeof(struct ipv6hdr
));
718 ip6_copy_metadata(frag
, skb
);
723 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
724 IPSTATS_MIB_FRAGCREATES
);
737 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
738 IPSTATS_MIB_FRAGOKS
);
739 dst_release(&rt
->dst
);
749 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
750 IPSTATS_MIB_FRAGFAILS
);
751 dst_release(&rt
->dst
);
755 skb_walk_frags(skb
, frag2
) {
759 frag2
->destructor
= NULL
;
760 skb
->truesize
+= frag2
->truesize
;
765 left
= skb
->len
- hlen
; /* Space per frame */
766 ptr
= hlen
; /* Where to start from */
769 * Fragment the datagram.
772 *prevhdr
= NEXTHDR_FRAGMENT
;
775 * Keep copying data until we run out.
779 /* IF: it doesn't fit, use 'mtu' - the data space left */
782 /* IF: we are not sending upto and including the packet end
783 then align the next start on an eight byte boundary */
791 if ((frag
= alloc_skb(len
+hlen
+sizeof(struct frag_hdr
)+LL_ALLOCATED_SPACE(rt
->dst
.dev
), GFP_ATOMIC
)) == NULL
) {
792 NETDEBUG(KERN_INFO
"IPv6: frag: no memory for new fragment!\n");
793 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
794 IPSTATS_MIB_FRAGFAILS
);
800 * Set up data on packet
803 ip6_copy_metadata(frag
, skb
);
804 skb_reserve(frag
, LL_RESERVED_SPACE(rt
->dst
.dev
));
805 skb_put(frag
, len
+ hlen
+ sizeof(struct frag_hdr
));
806 skb_reset_network_header(frag
);
807 fh
= (struct frag_hdr
*)(skb_network_header(frag
) + hlen
);
808 frag
->transport_header
= (frag
->network_header
+ hlen
+
809 sizeof(struct frag_hdr
));
812 * Charge the memory for the fragment to any owner
816 skb_set_owner_w(frag
, skb
->sk
);
819 * Copy the packet header into the new buffer.
821 skb_copy_from_linear_data(skb
, skb_network_header(frag
), hlen
);
824 * Build fragment header.
826 fh
->nexthdr
= nexthdr
;
829 ipv6_select_ident(fh
);
830 frag_id
= fh
->identification
;
832 fh
->identification
= frag_id
;
835 * Copy a block of the IP datagram.
837 if (skb_copy_bits(skb
, ptr
, skb_transport_header(frag
), len
))
841 fh
->frag_off
= htons(offset
);
843 fh
->frag_off
|= htons(IP6_MF
);
844 ipv6_hdr(frag
)->payload_len
= htons(frag
->len
-
845 sizeof(struct ipv6hdr
));
851 * Put this fragment into the sending queue.
857 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
858 IPSTATS_MIB_FRAGCREATES
);
860 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
861 IPSTATS_MIB_FRAGOKS
);
866 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
867 IPSTATS_MIB_FRAGFAILS
);
872 static inline int ip6_rt_check(struct rt6key
*rt_key
,
873 struct in6_addr
*fl_addr
,
874 struct in6_addr
*addr_cache
)
876 return (rt_key
->plen
!= 128 || !ipv6_addr_equal(fl_addr
, &rt_key
->addr
)) &&
877 (addr_cache
== NULL
|| !ipv6_addr_equal(fl_addr
, addr_cache
));
880 static struct dst_entry
*ip6_sk_dst_check(struct sock
*sk
,
881 struct dst_entry
*dst
,
884 struct ipv6_pinfo
*np
= inet6_sk(sk
);
885 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
890 /* Yes, checking route validity in not connected
891 * case is not very simple. Take into account,
892 * that we do not support routing by source, TOS,
893 * and MSG_DONTROUTE --ANK (980726)
895 * 1. ip6_rt_check(): If route was host route,
896 * check that cached destination is current.
897 * If it is network route, we still may
898 * check its validity using saved pointer
899 * to the last used address: daddr_cache.
900 * We do not want to save whole address now,
901 * (because main consumer of this service
902 * is tcp, which has not this problem),
903 * so that the last trick works only on connected
905 * 2. oif also should be the same.
907 if (ip6_rt_check(&rt
->rt6i_dst
, &fl
->fl6_dst
, np
->daddr_cache
) ||
908 #ifdef CONFIG_IPV6_SUBTREES
909 ip6_rt_check(&rt
->rt6i_src
, &fl
->fl6_src
, np
->saddr_cache
) ||
911 (fl
->oif
&& fl
->oif
!= dst
->dev
->ifindex
)) {
920 static int ip6_dst_lookup_tail(struct sock
*sk
,
921 struct dst_entry
**dst
, struct flowi
*fl
)
924 struct net
*net
= sock_net(sk
);
927 *dst
= ip6_route_output(net
, sk
, fl
);
929 if ((err
= (*dst
)->error
))
930 goto out_err_release
;
932 if (ipv6_addr_any(&fl
->fl6_src
)) {
933 err
= ipv6_dev_get_saddr(net
, ip6_dst_idev(*dst
)->dev
,
935 sk
? inet6_sk(sk
)->srcprefs
: 0,
938 goto out_err_release
;
941 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
943 * Here if the dst entry we've looked up
944 * has a neighbour entry that is in the INCOMPLETE
945 * state and the src address from the flow is
946 * marked as OPTIMISTIC, we release the found
947 * dst entry and replace it instead with the
948 * dst entry of the nexthop router
950 if ((*dst
)->neighbour
&& !((*dst
)->neighbour
->nud_state
& NUD_VALID
)) {
951 struct inet6_ifaddr
*ifp
;
955 ifp
= ipv6_get_ifaddr(net
, &fl
->fl6_src
,
958 redirect
= (ifp
&& ifp
->flags
& IFA_F_OPTIMISTIC
);
964 * We need to get the dst entry for the
965 * default router instead
968 memcpy(&fl_gw
, fl
, sizeof(struct flowi
));
969 memset(&fl_gw
.fl6_dst
, 0, sizeof(struct in6_addr
));
970 *dst
= ip6_route_output(net
, sk
, &fl_gw
);
971 if ((err
= (*dst
)->error
))
972 goto out_err_release
;
980 if (err
== -ENETUNREACH
)
981 IP6_INC_STATS_BH(net
, NULL
, IPSTATS_MIB_OUTNOROUTES
);
988 * ip6_dst_lookup - perform route lookup on flow
989 * @sk: socket which provides route info
990 * @dst: pointer to dst_entry * for result
991 * @fl: flow to lookup
993 * This function performs a route lookup on the given flow.
995 * It returns zero on success, or a standard errno code on error.
997 int ip6_dst_lookup(struct sock
*sk
, struct dst_entry
**dst
, struct flowi
*fl
)
1000 return ip6_dst_lookup_tail(sk
, dst
, fl
);
1002 EXPORT_SYMBOL_GPL(ip6_dst_lookup
);
1005 * ip6_sk_dst_lookup - perform socket cached route lookup on flow
1006 * @sk: socket which provides the dst cache and route info
1007 * @dst: pointer to dst_entry * for result
1008 * @fl: flow to lookup
1010 * This function performs a route lookup on the given flow with the
1011 * possibility of using the cached route in the socket if it is valid.
1012 * It will take the socket dst lock when operating on the dst cache.
1013 * As a result, this function can only be used in process context.
1015 * It returns zero on success, or a standard errno code on error.
1017 int ip6_sk_dst_lookup(struct sock
*sk
, struct dst_entry
**dst
, struct flowi
*fl
)
1021 *dst
= sk_dst_check(sk
, inet6_sk(sk
)->dst_cookie
);
1022 *dst
= ip6_sk_dst_check(sk
, *dst
, fl
);
1025 return ip6_dst_lookup_tail(sk
, dst
, fl
);
1027 EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup
);
1029 static inline int ip6_ufo_append_data(struct sock
*sk
,
1030 int getfrag(void *from
, char *to
, int offset
, int len
,
1031 int odd
, struct sk_buff
*skb
),
1032 void *from
, int length
, int hh_len
, int fragheaderlen
,
1033 int transhdrlen
, int mtu
,unsigned int flags
)
1036 struct sk_buff
*skb
;
1039 /* There is support for UDP large send offload by network
1040 * device, so create one single skb packet containing complete
1043 if ((skb
= skb_peek_tail(&sk
->sk_write_queue
)) == NULL
) {
1044 skb
= sock_alloc_send_skb(sk
,
1045 hh_len
+ fragheaderlen
+ transhdrlen
+ 20,
1046 (flags
& MSG_DONTWAIT
), &err
);
1050 /* reserve space for Hardware header */
1051 skb_reserve(skb
, hh_len
);
1053 /* create space for UDP/IP header */
1054 skb_put(skb
,fragheaderlen
+ transhdrlen
);
1056 /* initialize network header pointer */
1057 skb_reset_network_header(skb
);
1059 /* initialize protocol header pointer */
1060 skb
->transport_header
= skb
->network_header
+ fragheaderlen
;
1062 skb
->ip_summed
= CHECKSUM_PARTIAL
;
1064 sk
->sk_sndmsg_off
= 0;
1067 err
= skb_append_datato_frags(sk
,skb
, getfrag
, from
,
1068 (length
- transhdrlen
));
1070 struct frag_hdr fhdr
;
1072 /* Specify the length of each IPv6 datagram fragment.
1073 * It has to be a multiple of 8.
1075 skb_shinfo(skb
)->gso_size
= (mtu
- fragheaderlen
-
1076 sizeof(struct frag_hdr
)) & ~7;
1077 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
1078 ipv6_select_ident(&fhdr
);
1079 skb_shinfo(skb
)->ip6_frag_id
= fhdr
.identification
;
1080 __skb_queue_tail(&sk
->sk_write_queue
, skb
);
1084 /* There is not enough support do UPD LSO,
1085 * so follow normal path
1092 static inline struct ipv6_opt_hdr
*ip6_opt_dup(struct ipv6_opt_hdr
*src
,
1095 return src
? kmemdup(src
, (src
->hdrlen
+ 1) * 8, gfp
) : NULL
;
1098 static inline struct ipv6_rt_hdr
*ip6_rthdr_dup(struct ipv6_rt_hdr
*src
,
1101 return src
? kmemdup(src
, (src
->hdrlen
+ 1) * 8, gfp
) : NULL
;
1104 int ip6_append_data(struct sock
*sk
, int getfrag(void *from
, char *to
,
1105 int offset
, int len
, int odd
, struct sk_buff
*skb
),
1106 void *from
, int length
, int transhdrlen
,
1107 int hlimit
, int tclass
, struct ipv6_txoptions
*opt
, struct flowi
*fl
,
1108 struct rt6_info
*rt
, unsigned int flags
, int dontfrag
)
1110 struct inet_sock
*inet
= inet_sk(sk
);
1111 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1112 struct sk_buff
*skb
;
1113 unsigned int maxfraglen
, fragheaderlen
;
1120 int csummode
= CHECKSUM_NONE
;
1122 if (flags
&MSG_PROBE
)
1124 if (skb_queue_empty(&sk
->sk_write_queue
)) {
1129 if (WARN_ON(np
->cork
.opt
))
1132 np
->cork
.opt
= kmalloc(opt
->tot_len
, sk
->sk_allocation
);
1133 if (unlikely(np
->cork
.opt
== NULL
))
1136 np
->cork
.opt
->tot_len
= opt
->tot_len
;
1137 np
->cork
.opt
->opt_flen
= opt
->opt_flen
;
1138 np
->cork
.opt
->opt_nflen
= opt
->opt_nflen
;
1140 np
->cork
.opt
->dst0opt
= ip6_opt_dup(opt
->dst0opt
,
1142 if (opt
->dst0opt
&& !np
->cork
.opt
->dst0opt
)
1145 np
->cork
.opt
->dst1opt
= ip6_opt_dup(opt
->dst1opt
,
1147 if (opt
->dst1opt
&& !np
->cork
.opt
->dst1opt
)
1150 np
->cork
.opt
->hopopt
= ip6_opt_dup(opt
->hopopt
,
1152 if (opt
->hopopt
&& !np
->cork
.opt
->hopopt
)
1155 np
->cork
.opt
->srcrt
= ip6_rthdr_dup(opt
->srcrt
,
1157 if (opt
->srcrt
&& !np
->cork
.opt
->srcrt
)
1160 /* need source address above miyazawa*/
1163 inet
->cork
.dst
= &rt
->dst
;
1164 inet
->cork
.fl
= *fl
;
1165 np
->cork
.hop_limit
= hlimit
;
1166 np
->cork
.tclass
= tclass
;
1167 mtu
= np
->pmtudisc
== IPV6_PMTUDISC_PROBE
?
1168 rt
->dst
.dev
->mtu
: dst_mtu(rt
->dst
.path
);
1169 if (np
->frag_size
< mtu
) {
1171 mtu
= np
->frag_size
;
1173 inet
->cork
.fragsize
= mtu
;
1174 if (dst_allfrag(rt
->dst
.path
))
1175 inet
->cork
.flags
|= IPCORK_ALLFRAG
;
1176 inet
->cork
.length
= 0;
1177 sk
->sk_sndmsg_page
= NULL
;
1178 sk
->sk_sndmsg_off
= 0;
1179 exthdrlen
= rt
->dst
.header_len
+ (opt
? opt
->opt_flen
: 0) -
1180 rt
->rt6i_nfheader_len
;
1181 length
+= exthdrlen
;
1182 transhdrlen
+= exthdrlen
;
1184 rt
= (struct rt6_info
*)inet
->cork
.dst
;
1185 fl
= &inet
->cork
.fl
;
1189 mtu
= inet
->cork
.fragsize
;
1192 hh_len
= LL_RESERVED_SPACE(rt
->dst
.dev
);
1194 fragheaderlen
= sizeof(struct ipv6hdr
) + rt
->rt6i_nfheader_len
+
1195 (opt
? opt
->opt_nflen
: 0);
1196 maxfraglen
= ((mtu
- fragheaderlen
) & ~7) + fragheaderlen
- sizeof(struct frag_hdr
);
1198 if (mtu
<= sizeof(struct ipv6hdr
) + IPV6_MAXPLEN
) {
1199 if (inet
->cork
.length
+ length
> sizeof(struct ipv6hdr
) + IPV6_MAXPLEN
- fragheaderlen
) {
1200 ipv6_local_error(sk
, EMSGSIZE
, fl
, mtu
-exthdrlen
);
1206 * Let's try using as much space as possible.
1207 * Use MTU if total length of the message fits into the MTU.
1208 * Otherwise, we need to reserve fragment header and
1209 * fragment alignment (= 8-15 octects, in total).
1211 * Note that we may need to "move" the data from the tail of
1212 * of the buffer to the new fragment when we split
1215 * FIXME: It may be fragmented into multiple chunks
1216 * at once if non-fragmentable extension headers
1221 inet
->cork
.length
+= length
;
1223 int proto
= sk
->sk_protocol
;
1224 if (dontfrag
&& (proto
== IPPROTO_UDP
|| proto
== IPPROTO_RAW
)){
1225 ipv6_local_rxpmtu(sk
, fl
, mtu
-exthdrlen
);
1229 if (proto
== IPPROTO_UDP
&&
1230 (rt
->dst
.dev
->features
& NETIF_F_UFO
)) {
1232 err
= ip6_ufo_append_data(sk
, getfrag
, from
, length
,
1233 hh_len
, fragheaderlen
,
1234 transhdrlen
, mtu
, flags
);
1241 if ((skb
= skb_peek_tail(&sk
->sk_write_queue
)) == NULL
)
1244 while (length
> 0) {
1245 /* Check if the remaining data fits into current packet. */
1246 copy
= (inet
->cork
.length
<= mtu
&& !(inet
->cork
.flags
& IPCORK_ALLFRAG
) ? mtu
: maxfraglen
) - skb
->len
;
1248 copy
= maxfraglen
- skb
->len
;
1252 unsigned int datalen
;
1253 unsigned int fraglen
;
1254 unsigned int fraggap
;
1255 unsigned int alloclen
;
1256 struct sk_buff
*skb_prev
;
1260 /* There's no room in the current skb */
1262 fraggap
= skb_prev
->len
- maxfraglen
;
1267 * If remaining data exceeds the mtu,
1268 * we know we need more fragment(s).
1270 datalen
= length
+ fraggap
;
1271 if (datalen
> (inet
->cork
.length
<= mtu
&& !(inet
->cork
.flags
& IPCORK_ALLFRAG
) ? mtu
: maxfraglen
) - fragheaderlen
)
1272 datalen
= maxfraglen
- fragheaderlen
;
1274 fraglen
= datalen
+ fragheaderlen
;
1275 if ((flags
& MSG_MORE
) &&
1276 !(rt
->dst
.dev
->features
&NETIF_F_SG
))
1279 alloclen
= datalen
+ fragheaderlen
;
1282 * The last fragment gets additional space at tail.
1283 * Note: we overallocate on fragments with MSG_MODE
1284 * because we have no idea if we're the last one.
1286 if (datalen
== length
+ fraggap
)
1287 alloclen
+= rt
->dst
.trailer_len
;
1290 * We just reserve space for fragment header.
1291 * Note: this may be overallocation if the message
1292 * (without MSG_MORE) fits into the MTU.
1294 alloclen
+= sizeof(struct frag_hdr
);
1297 skb
= sock_alloc_send_skb(sk
,
1299 (flags
& MSG_DONTWAIT
), &err
);
1302 if (atomic_read(&sk
->sk_wmem_alloc
) <=
1304 skb
= sock_wmalloc(sk
,
1305 alloclen
+ hh_len
, 1,
1307 if (unlikely(skb
== NULL
))
1313 * Fill in the control structures
1315 skb
->ip_summed
= csummode
;
1317 /* reserve for fragmentation */
1318 skb_reserve(skb
, hh_len
+sizeof(struct frag_hdr
));
1321 * Find where to start putting bytes
1323 data
= skb_put(skb
, fraglen
);
1324 skb_set_network_header(skb
, exthdrlen
);
1325 data
+= fragheaderlen
;
1326 skb
->transport_header
= (skb
->network_header
+
1329 skb
->csum
= skb_copy_and_csum_bits(
1330 skb_prev
, maxfraglen
,
1331 data
+ transhdrlen
, fraggap
, 0);
1332 skb_prev
->csum
= csum_sub(skb_prev
->csum
,
1335 pskb_trim_unique(skb_prev
, maxfraglen
);
1337 copy
= datalen
- transhdrlen
- fraggap
;
1342 } else if (copy
> 0 && getfrag(from
, data
+ transhdrlen
, offset
, copy
, fraggap
, skb
) < 0) {
1349 length
-= datalen
- fraggap
;
1352 csummode
= CHECKSUM_NONE
;
1355 * Put the packet on the pending queue
1357 __skb_queue_tail(&sk
->sk_write_queue
, skb
);
1364 if (!(rt
->dst
.dev
->features
&NETIF_F_SG
)) {
1368 if (getfrag(from
, skb_put(skb
, copy
),
1369 offset
, copy
, off
, skb
) < 0) {
1370 __skb_trim(skb
, off
);
1375 int i
= skb_shinfo(skb
)->nr_frags
;
1376 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
-1];
1377 struct page
*page
= sk
->sk_sndmsg_page
;
1378 int off
= sk
->sk_sndmsg_off
;
1381 if (page
&& (left
= PAGE_SIZE
- off
) > 0) {
1384 if (page
!= frag
->page
) {
1385 if (i
== MAX_SKB_FRAGS
) {
1390 skb_fill_page_desc(skb
, i
, page
, sk
->sk_sndmsg_off
, 0);
1391 frag
= &skb_shinfo(skb
)->frags
[i
];
1393 } else if(i
< MAX_SKB_FRAGS
) {
1394 if (copy
> PAGE_SIZE
)
1396 page
= alloc_pages(sk
->sk_allocation
, 0);
1401 sk
->sk_sndmsg_page
= page
;
1402 sk
->sk_sndmsg_off
= 0;
1404 skb_fill_page_desc(skb
, i
, page
, 0, 0);
1405 frag
= &skb_shinfo(skb
)->frags
[i
];
1410 if (getfrag(from
, page_address(frag
->page
)+frag
->page_offset
+frag
->size
, offset
, copy
, skb
->len
, skb
) < 0) {
1414 sk
->sk_sndmsg_off
+= copy
;
1417 skb
->data_len
+= copy
;
1418 skb
->truesize
+= copy
;
1419 atomic_add(copy
, &sk
->sk_wmem_alloc
);
1426 inet
->cork
.length
-= length
;
1427 IP6_INC_STATS(sock_net(sk
), rt
->rt6i_idev
, IPSTATS_MIB_OUTDISCARDS
);
1431 static void ip6_cork_release(struct inet_sock
*inet
, struct ipv6_pinfo
*np
)
1434 kfree(np
->cork
.opt
->dst0opt
);
1435 kfree(np
->cork
.opt
->dst1opt
);
1436 kfree(np
->cork
.opt
->hopopt
);
1437 kfree(np
->cork
.opt
->srcrt
);
1438 kfree(np
->cork
.opt
);
1439 np
->cork
.opt
= NULL
;
1442 if (inet
->cork
.dst
) {
1443 dst_release(inet
->cork
.dst
);
1444 inet
->cork
.dst
= NULL
;
1445 inet
->cork
.flags
&= ~IPCORK_ALLFRAG
;
1447 memset(&inet
->cork
.fl
, 0, sizeof(inet
->cork
.fl
));
1450 int ip6_push_pending_frames(struct sock
*sk
)
1452 struct sk_buff
*skb
, *tmp_skb
;
1453 struct sk_buff
**tail_skb
;
1454 struct in6_addr final_dst_buf
, *final_dst
= &final_dst_buf
;
1455 struct inet_sock
*inet
= inet_sk(sk
);
1456 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1457 struct net
*net
= sock_net(sk
);
1458 struct ipv6hdr
*hdr
;
1459 struct ipv6_txoptions
*opt
= np
->cork
.opt
;
1460 struct rt6_info
*rt
= (struct rt6_info
*)inet
->cork
.dst
;
1461 struct flowi
*fl
= &inet
->cork
.fl
;
1462 unsigned char proto
= fl
->proto
;
1465 if ((skb
= __skb_dequeue(&sk
->sk_write_queue
)) == NULL
)
1467 tail_skb
= &(skb_shinfo(skb
)->frag_list
);
1469 /* move skb->data to ip header from ext header */
1470 if (skb
->data
< skb_network_header(skb
))
1471 __skb_pull(skb
, skb_network_offset(skb
));
1472 while ((tmp_skb
= __skb_dequeue(&sk
->sk_write_queue
)) != NULL
) {
1473 __skb_pull(tmp_skb
, skb_network_header_len(skb
));
1474 *tail_skb
= tmp_skb
;
1475 tail_skb
= &(tmp_skb
->next
);
1476 skb
->len
+= tmp_skb
->len
;
1477 skb
->data_len
+= tmp_skb
->len
;
1478 skb
->truesize
+= tmp_skb
->truesize
;
1479 tmp_skb
->destructor
= NULL
;
1483 /* Allow local fragmentation. */
1484 if (np
->pmtudisc
< IPV6_PMTUDISC_DO
)
1487 ipv6_addr_copy(final_dst
, &fl
->fl6_dst
);
1488 __skb_pull(skb
, skb_network_header_len(skb
));
1489 if (opt
&& opt
->opt_flen
)
1490 ipv6_push_frag_opts(skb
, opt
, &proto
);
1491 if (opt
&& opt
->opt_nflen
)
1492 ipv6_push_nfrag_opts(skb
, opt
, &proto
, &final_dst
);
1494 skb_push(skb
, sizeof(struct ipv6hdr
));
1495 skb_reset_network_header(skb
);
1496 hdr
= ipv6_hdr(skb
);
1498 *(__be32
*)hdr
= fl
->fl6_flowlabel
|
1499 htonl(0x60000000 | ((int)np
->cork
.tclass
<< 20));
1501 hdr
->hop_limit
= np
->cork
.hop_limit
;
1502 hdr
->nexthdr
= proto
;
1503 ipv6_addr_copy(&hdr
->saddr
, &fl
->fl6_src
);
1504 ipv6_addr_copy(&hdr
->daddr
, final_dst
);
1506 skb
->priority
= sk
->sk_priority
;
1507 skb
->mark
= sk
->sk_mark
;
1509 skb_dst_set(skb
, dst_clone(&rt
->dst
));
1510 IP6_UPD_PO_STATS(net
, rt
->rt6i_idev
, IPSTATS_MIB_OUT
, skb
->len
);
1511 if (proto
== IPPROTO_ICMPV6
) {
1512 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
1514 ICMP6MSGOUT_INC_STATS_BH(net
, idev
, icmp6_hdr(skb
)->icmp6_type
);
1515 ICMP6_INC_STATS_BH(net
, idev
, ICMP6_MIB_OUTMSGS
);
1518 err
= ip6_local_out(skb
);
1521 err
= net_xmit_errno(err
);
1527 ip6_cork_release(inet
, np
);
1530 IP6_INC_STATS(net
, rt
->rt6i_idev
, IPSTATS_MIB_OUTDISCARDS
);
1534 void ip6_flush_pending_frames(struct sock
*sk
)
1536 struct sk_buff
*skb
;
1538 while ((skb
= __skb_dequeue_tail(&sk
->sk_write_queue
)) != NULL
) {
1540 IP6_INC_STATS(sock_net(sk
), ip6_dst_idev(skb_dst(skb
)),
1541 IPSTATS_MIB_OUTDISCARDS
);
1545 ip6_cork_release(inet_sk(sk
), inet6_sk(sk
));