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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>
41
42#include <linux/netfilter.h>
43#include <linux/netfilter_ipv6.h>
44
45#include <net/sock.h>
46#include <net/snmp.h>
47
48#include <net/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>
54#include <net/icmp.h>
55#include <net/xfrm.h>
56#include <net/checksum.h>
57#include <linux/mroute6.h>
58
59int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
60
61int __ip6_local_out(struct sk_buff *skb)
62{
63 int len;
64
65 len = skb->len - sizeof(struct ipv6hdr);
66 if (len > IPV6_MAXPLEN)
67 len = 0;
68 ipv6_hdr(skb)->payload_len = htons(len);
69
70 return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
71 skb_dst(skb)->dev, dst_output);
72}
73
74int ip6_local_out(struct sk_buff *skb)
75{
76 int err;
77
78 err = __ip6_local_out(skb);
79 if (likely(err == 1))
80 err = dst_output(skb);
81
82 return err;
83}
84EXPORT_SYMBOL_GPL(ip6_local_out);
85
86
87static int ip6_dev_loopback_xmit(struct sk_buff *newskb)
88{
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));
94
95 netif_rx_ni(newskb);
96 return 0;
97}
98
99static int ip6_finish_output2(struct sk_buff *skb)
100{
101 struct dst_entry *dst = skb_dst(skb);
102 struct net_device *dev = dst->dev;
103
104 skb->protocol = htons(ETH_P_IPV6);
105 skb->dev = dev;
106
107 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
108 struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
109
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);
116
117
118
119
120 if (newskb)
121 NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,
122 newskb, NULL, newskb->dev,
123 ip6_dev_loopback_xmit);
124
125 if (ipv6_hdr(skb)->hop_limit == 0) {
126 IP6_INC_STATS(dev_net(dev), idev,
127 IPSTATS_MIB_OUTDISCARDS);
128 kfree_skb(skb);
129 return 0;
130 }
131 }
132
133 IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST,
134 skb->len);
135 }
136
137 if (dst->hh)
138 return neigh_hh_output(dst->hh, skb);
139 else if (dst->neighbour)
140 return dst->neighbour->output(skb);
141
142 IP6_INC_STATS_BH(dev_net(dst->dev),
143 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
144 kfree_skb(skb);
145 return -EINVAL;
146}
147
148static int ip6_finish_output(struct sk_buff *skb)
149{
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);
153 else
154 return ip6_finish_output2(skb);
155}
156
157int ip6_output(struct sk_buff *skb)
158{
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);
164 kfree_skb(skb);
165 return 0;
166 }
167
168 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev,
169 ip6_finish_output,
170 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
171}
172
173
174
175
176
177int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
178 struct ipv6_txoptions *opt)
179{
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);
184 struct ipv6hdr *hdr;
185 u8 proto = fl->proto;
186 int seg_len = skb->len;
187 int hlimit = -1;
188 int tclass = 0;
189 u32 mtu;
190
191 if (opt) {
192 unsigned int head_room;
193
194
195
196
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);
200
201 if (skb_headroom(skb) < head_room) {
202 struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
203 if (skb2 == NULL) {
204 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
205 IPSTATS_MIB_OUTDISCARDS);
206 kfree_skb(skb);
207 return -ENOBUFS;
208 }
209 kfree_skb(skb);
210 skb = skb2;
211 skb_set_owner_w(skb, sk);
212 }
213 if (opt->opt_flen)
214 ipv6_push_frag_opts(skb, opt, &proto);
215 if (opt->opt_nflen)
216 ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop);
217 }
218
219 skb_push(skb, sizeof(struct ipv6hdr));
220 skb_reset_network_header(skb);
221 hdr = ipv6_hdr(skb);
222
223
224
225
226 if (np) {
227 tclass = np->tclass;
228 hlimit = np->hop_limit;
229 }
230 if (hlimit < 0)
231 hlimit = ip6_dst_hoplimit(dst);
232
233 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel;
234
235 hdr->payload_len = htons(seg_len);
236 hdr->nexthdr = proto;
237 hdr->hop_limit = hlimit;
238
239 ipv6_addr_copy(&hdr->saddr, &fl->fl6_src);
240 ipv6_addr_copy(&hdr->daddr, first_hop);
241
242 skb->priority = sk->sk_priority;
243 skb->mark = sk->sk_mark;
244
245 mtu = dst_mtu(dst);
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);
251 }
252
253 if (net_ratelimit())
254 printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n");
255 skb->dev = dst->dev;
256 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
257 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS);
258 kfree_skb(skb);
259 return -EMSGSIZE;
260}
261
262EXPORT_SYMBOL(ip6_xmit);
263
264
265
266
267
268
269
270
271int 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,
273 int proto, int len)
274{
275 struct ipv6_pinfo *np = inet6_sk(sk);
276 struct ipv6hdr *hdr;
277 int totlen;
278
279 skb->protocol = htons(ETH_P_IPV6);
280 skb->dev = dev;
281
282 totlen = len + sizeof(struct ipv6hdr);
283
284 skb_reset_network_header(skb);
285 skb_put(skb, sizeof(struct ipv6hdr));
286 hdr = ipv6_hdr(skb);
287
288 *(__be32*)hdr = htonl(0x60000000);
289
290 hdr->payload_len = htons(len);
291 hdr->nexthdr = proto;
292 hdr->hop_limit = np->hop_limit;
293
294 ipv6_addr_copy(&hdr->saddr, saddr);
295 ipv6_addr_copy(&hdr->daddr, daddr);
296
297 return 0;
298}
299
300static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
301{
302 struct ip6_ra_chain *ra;
303 struct sock *last = NULL;
304
305 read_lock(&ip6_ra_lock);
306 for (ra = ip6_ra_chain; ra; ra = ra->next) {
307 struct sock *sk = ra->sk;
308 if (sk && ra->sel == sel &&
309 (!sk->sk_bound_dev_if ||
310 sk->sk_bound_dev_if == skb->dev->ifindex)) {
311 if (last) {
312 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
313 if (skb2)
314 rawv6_rcv(last, skb2);
315 }
316 last = sk;
317 }
318 }
319
320 if (last) {
321 rawv6_rcv(last, skb);
322 read_unlock(&ip6_ra_lock);
323 return 1;
324 }
325 read_unlock(&ip6_ra_lock);
326 return 0;
327}
328
329static int ip6_forward_proxy_check(struct sk_buff *skb)
330{
331 struct ipv6hdr *hdr = ipv6_hdr(skb);
332 u8 nexthdr = hdr->nexthdr;
333 int offset;
334
335 if (ipv6_ext_hdr(nexthdr)) {
336 offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr);
337 if (offset < 0)
338 return 0;
339 } else
340 offset = sizeof(struct ipv6hdr);
341
342 if (nexthdr == IPPROTO_ICMPV6) {
343 struct icmp6hdr *icmp6;
344
345 if (!pskb_may_pull(skb, (skb_network_header(skb) +
346 offset + 1 - skb->data)))
347 return 0;
348
349 icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
350
351 switch (icmp6->icmp6_type) {
352 case NDISC_ROUTER_SOLICITATION:
353 case NDISC_ROUTER_ADVERTISEMENT:
354 case NDISC_NEIGHBOUR_SOLICITATION:
355 case NDISC_NEIGHBOUR_ADVERTISEMENT:
356 case NDISC_REDIRECT:
357
358
359
360
361 return 1;
362 default:
363 break;
364 }
365 }
366
367
368
369
370
371
372 if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
373 dst_link_failure(skb);
374 return -1;
375 }
376
377 return 0;
378}
379
380static inline int ip6_forward_finish(struct sk_buff *skb)
381{
382 return dst_output(skb);
383}
384
385int ip6_forward(struct sk_buff *skb)
386{
387 struct dst_entry *dst = skb_dst(skb);
388 struct ipv6hdr *hdr = ipv6_hdr(skb);
389 struct inet6_skb_parm *opt = IP6CB(skb);
390 struct net *net = dev_net(dst->dev);
391 u32 mtu;
392
393 if (net->ipv6.devconf_all->forwarding == 0)
394 goto error;
395
396 if (skb_warn_if_lro(skb))
397 goto drop;
398
399 if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
400 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
401 goto drop;
402 }
403
404 if (skb->pkt_type != PACKET_HOST)
405 goto drop;
406
407 skb_forward_csum(skb);
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422 if (opt->ra) {
423 u8 *ptr = skb_network_header(skb) + opt->ra;
424 if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3]))
425 return 0;
426 }
427
428
429
430
431 if (hdr->hop_limit <= 1) {
432
433 skb->dev = dst->dev;
434 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0);
435 IP6_INC_STATS_BH(net,
436 ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);
437
438 kfree_skb(skb);
439 return -ETIMEDOUT;
440 }
441
442
443 if (net->ipv6.devconf_all->proxy_ndp &&
444 pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
445 int proxied = ip6_forward_proxy_check(skb);
446 if (proxied > 0)
447 return ip6_input(skb);
448 else if (proxied < 0) {
449 IP6_INC_STATS(net, ip6_dst_idev(dst),
450 IPSTATS_MIB_INDISCARDS);
451 goto drop;
452 }
453 }
454
455 if (!xfrm6_route_forward(skb)) {
456 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
457 goto drop;
458 }
459 dst = skb_dst(skb);
460
461
462
463
464
465 if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 &&
466 !skb_sec_path(skb)) {
467 struct in6_addr *target = NULL;
468 struct rt6_info *rt;
469 struct neighbour *n = dst->neighbour;
470
471
472
473
474
475
476 rt = (struct rt6_info *) dst;
477 if ((rt->rt6i_flags & RTF_GATEWAY))
478 target = (struct in6_addr*)&n->primary_key;
479 else
480 target = &hdr->daddr;
481
482
483
484
485 if (xrlim_allow(dst, 1*HZ))
486 ndisc_send_redirect(skb, n, target);
487 } else {
488 int addrtype = ipv6_addr_type(&hdr->saddr);
489
490
491 if (addrtype == IPV6_ADDR_ANY ||
492 addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK))
493 goto error;
494 if (addrtype & IPV6_ADDR_LINKLOCAL) {
495 icmpv6_send(skb, ICMPV6_DEST_UNREACH,
496 ICMPV6_NOT_NEIGHBOUR, 0);
497 goto error;
498 }
499 }
500
501 mtu = dst_mtu(dst);
502 if (mtu < IPV6_MIN_MTU)
503 mtu = IPV6_MIN_MTU;
504
505 if (skb->len > mtu && !skb_is_gso(skb)) {
506
507 skb->dev = dst->dev;
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);
513 kfree_skb(skb);
514 return -EMSGSIZE;
515 }
516
517 if (skb_cow(skb, dst->dev->hard_header_len)) {
518 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS);
519 goto drop;
520 }
521
522 hdr = ipv6_hdr(skb);
523
524
525
526 hdr->hop_limit--;
527
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,
530 ip6_forward_finish);
531
532error:
533 IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS);
534drop:
535 kfree_skb(skb);
536 return -EINVAL;
537}
538
539static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
540{
541 to->pkt_type = from->pkt_type;
542 to->priority = from->priority;
543 to->protocol = from->protocol;
544 skb_dst_drop(to);
545 skb_dst_set(to, dst_clone(skb_dst(from)));
546 to->dev = from->dev;
547 to->mark = from->mark;
548
549#ifdef CONFIG_NET_SCHED
550 to->tc_index = from->tc_index;
551#endif
552 nf_copy(to, from);
553#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
554 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
555 to->nf_trace = from->nf_trace;
556#endif
557 skb_copy_secmark(to, from);
558}
559
560int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
561{
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;
566 int found_rhdr = 0;
567 *nexthdr = &ipv6_hdr(skb)->nexthdr;
568
569 while (offset + 1 <= packet_len) {
570
571 switch (**nexthdr) {
572
573 case NEXTHDR_HOP:
574 break;
575 case NEXTHDR_ROUTING:
576 found_rhdr = 1;
577 break;
578 case NEXTHDR_DEST:
579#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
580 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
581 break;
582#endif
583 if (found_rhdr)
584 return offset;
585 break;
586 default :
587 return offset;
588 }
589
590 offset += ipv6_optlen(exthdr);
591 *nexthdr = &exthdr->nexthdr;
592 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
593 offset);
594 }
595
596 return offset;
597}
598
599int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
600{
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;
605 struct frag_hdr *fh;
606 unsigned int mtu, hlen, left, len;
607 __be32 frag_id = 0;
608 int ptr, offset = 0, err=0;
609 u8 *prevhdr, nexthdr = 0;
610 struct net *net = dev_net(skb_dst(skb)->dev);
611
612 hlen = ip6_find_1stfragopt(skb, &prevhdr);
613 nexthdr = *prevhdr;
614
615 mtu = ip6_skb_dst_mtu(skb);
616
617
618
619
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);
625 kfree_skb(skb);
626 return -EMSGSIZE;
627 }
628
629 if (np && np->frag_size < mtu) {
630 if (np->frag_size)
631 mtu = np->frag_size;
632 }
633 mtu -= hlen + sizeof(struct frag_hdr);
634
635 if (skb_has_frag_list(skb)) {
636 int first_len = skb_pagelen(skb);
637 struct sk_buff *frag2;
638
639 if (first_len - hlen > mtu ||
640 ((first_len - hlen) & 7) ||
641 skb_cloned(skb))
642 goto slow_path;
643
644 skb_walk_frags(skb, frag) {
645
646 if (frag->len > mtu ||
647 ((frag->len & 7) && frag->next) ||
648 skb_headroom(frag) < hlen)
649 goto slow_path_clean;
650
651
652 if (skb_shared(frag))
653 goto slow_path_clean;
654
655 BUG_ON(frag->sk);
656 if (skb->sk) {
657 frag->sk = skb->sk;
658 frag->destructor = sock_wfree;
659 }
660 skb->truesize -= frag->truesize;
661 }
662
663 err = 0;
664 offset = 0;
665 frag = skb_shinfo(skb)->frag_list;
666 skb_frag_list_init(skb);
667
668
669 *prevhdr = NEXTHDR_FRAGMENT;
670 tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
671 if (!tmp_hdr) {
672 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
673 IPSTATS_MIB_FRAGFAILS);
674 return -ENOMEM;
675 }
676
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);
682
683 ipv6_select_ident(fh);
684 fh->nexthdr = nexthdr;
685 fh->reserved = 0;
686 fh->frag_off = htons(IP6_MF);
687 frag_id = fh->identification;
688
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));
694
695 dst_hold(&rt->dst);
696
697 for (;;) {
698
699
700 if (frag) {
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,
707 hlen);
708 offset += skb->len - hlen - sizeof(struct frag_hdr);
709 fh->nexthdr = nexthdr;
710 fh->reserved = 0;
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 =
716 htons(frag->len -
717 sizeof(struct ipv6hdr));
718 ip6_copy_metadata(frag, skb);
719 }
720
721 err = output(skb);
722 if(!err)
723 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
724 IPSTATS_MIB_FRAGCREATES);
725
726 if (err || !frag)
727 break;
728
729 skb = frag;
730 frag = skb->next;
731 skb->next = NULL;
732 }
733
734 kfree(tmp_hdr);
735
736 if (err == 0) {
737 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
738 IPSTATS_MIB_FRAGOKS);
739 dst_release(&rt->dst);
740 return 0;
741 }
742
743 while (frag) {
744 skb = frag->next;
745 kfree_skb(frag);
746 frag = skb;
747 }
748
749 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
750 IPSTATS_MIB_FRAGFAILS);
751 dst_release(&rt->dst);
752 return err;
753
754slow_path_clean:
755 skb_walk_frags(skb, frag2) {
756 if (frag2 == frag)
757 break;
758 frag2->sk = NULL;
759 frag2->destructor = NULL;
760 skb->truesize += frag2->truesize;
761 }
762 }
763
764slow_path:
765 left = skb->len - hlen;
766 ptr = hlen;
767
768
769
770
771
772 *prevhdr = NEXTHDR_FRAGMENT;
773
774
775
776
777 while(left > 0) {
778 len = left;
779
780 if (len > mtu)
781 len = mtu;
782
783
784 if (len < left) {
785 len &= ~7;
786 }
787
788
789
790
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);
795 err = -ENOMEM;
796 goto fail;
797 }
798
799
800
801
802
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));
810
811
812
813
814
815 if (skb->sk)
816 skb_set_owner_w(frag, skb->sk);
817
818
819
820
821 skb_copy_from_linear_data(skb, skb_network_header(frag), hlen);
822
823
824
825
826 fh->nexthdr = nexthdr;
827 fh->reserved = 0;
828 if (!frag_id) {
829 ipv6_select_ident(fh);
830 frag_id = fh->identification;
831 } else
832 fh->identification = frag_id;
833
834
835
836
837 if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len))
838 BUG();
839 left -= len;
840
841 fh->frag_off = htons(offset);
842 if (left > 0)
843 fh->frag_off |= htons(IP6_MF);
844 ipv6_hdr(frag)->payload_len = htons(frag->len -
845 sizeof(struct ipv6hdr));
846
847 ptr += len;
848 offset += len;
849
850
851
852
853 err = output(frag);
854 if (err)
855 goto fail;
856
857 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
858 IPSTATS_MIB_FRAGCREATES);
859 }
860 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
861 IPSTATS_MIB_FRAGOKS);
862 kfree_skb(skb);
863 return err;
864
865fail:
866 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
867 IPSTATS_MIB_FRAGFAILS);
868 kfree_skb(skb);
869 return err;
870}
871
872static inline int ip6_rt_check(struct rt6key *rt_key,
873 struct in6_addr *fl_addr,
874 struct in6_addr *addr_cache)
875{
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));
878}
879
880static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
881 struct dst_entry *dst,
882 struct flowi *fl)
883{
884 struct ipv6_pinfo *np = inet6_sk(sk);
885 struct rt6_info *rt = (struct rt6_info *)dst;
886
887 if (!dst)
888 goto out;
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
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) ||
910#endif
911 (fl->oif && fl->oif != dst->dev->ifindex)) {
912 dst_release(dst);
913 dst = NULL;
914 }
915
916out:
917 return dst;
918}
919
920static int ip6_dst_lookup_tail(struct sock *sk,
921 struct dst_entry **dst, struct flowi *fl)
922{
923 int err;
924 struct net *net = sock_net(sk);
925
926 if (*dst == NULL)
927 *dst = ip6_route_output(net, sk, fl);
928
929 if ((err = (*dst)->error))
930 goto out_err_release;
931
932 if (ipv6_addr_any(&fl->fl6_src)) {
933 err = ipv6_dev_get_saddr(net, ip6_dst_idev(*dst)->dev,
934 &fl->fl6_dst,
935 sk ? inet6_sk(sk)->srcprefs : 0,
936 &fl->fl6_src);
937 if (err)
938 goto out_err_release;
939 }
940
941#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
942
943
944
945
946
947
948
949
950 if ((*dst)->neighbour && !((*dst)->neighbour->nud_state & NUD_VALID)) {
951 struct inet6_ifaddr *ifp;
952 struct flowi fl_gw;
953 int redirect;
954
955 ifp = ipv6_get_ifaddr(net, &fl->fl6_src,
956 (*dst)->dev, 1);
957
958 redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
959 if (ifp)
960 in6_ifa_put(ifp);
961
962 if (redirect) {
963
964
965
966
967 dst_release(*dst);
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;
973 }
974 }
975#endif
976
977 return 0;
978
979out_err_release:
980 if (err == -ENETUNREACH)
981 IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES);
982 dst_release(*dst);
983 *dst = NULL;
984 return err;
985}
986
987
988
989
990
991
992
993
994
995
996
997int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
998{
999 *dst = NULL;
1000 return ip6_dst_lookup_tail(sk, dst, fl);
1001}
1002EXPORT_SYMBOL_GPL(ip6_dst_lookup);
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
1018{
1019 *dst = NULL;
1020 if (sk) {
1021 *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
1022 *dst = ip6_sk_dst_check(sk, *dst, fl);
1023 }
1024
1025 return ip6_dst_lookup_tail(sk, dst, fl);
1026}
1027EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup);
1028
1029static 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)
1034
1035{
1036 struct sk_buff *skb;
1037 int err;
1038
1039
1040
1041
1042
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);
1047 if (skb == NULL)
1048 return -ENOMEM;
1049
1050
1051 skb_reserve(skb, hh_len);
1052
1053
1054 skb_put(skb,fragheaderlen + transhdrlen);
1055
1056
1057 skb_reset_network_header(skb);
1058
1059
1060 skb->transport_header = skb->network_header + fragheaderlen;
1061
1062 skb->ip_summed = CHECKSUM_PARTIAL;
1063 skb->csum = 0;
1064 sk->sk_sndmsg_off = 0;
1065 }
1066
1067 err = skb_append_datato_frags(sk,skb, getfrag, from,
1068 (length - transhdrlen));
1069 if (!err) {
1070 struct frag_hdr fhdr;
1071
1072
1073
1074
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);
1081
1082 return 0;
1083 }
1084
1085
1086
1087 kfree_skb(skb);
1088
1089 return err;
1090}
1091
1092static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
1093 gfp_t gfp)
1094{
1095 return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
1096}
1097
1098static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
1099 gfp_t gfp)
1100{
1101 return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
1102}
1103
1104int 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)
1109{
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;
1114 int exthdrlen;
1115 int hh_len;
1116 int mtu;
1117 int copy;
1118 int err;
1119 int offset = 0;
1120 int csummode = CHECKSUM_NONE;
1121
1122 if (flags&MSG_PROBE)
1123 return 0;
1124 if (skb_queue_empty(&sk->sk_write_queue)) {
1125
1126
1127
1128 if (opt) {
1129 if (WARN_ON(np->cork.opt))
1130 return -EINVAL;
1131
1132 np->cork.opt = kmalloc(opt->tot_len, sk->sk_allocation);
1133 if (unlikely(np->cork.opt == NULL))
1134 return -ENOBUFS;
1135
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;
1139
1140 np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt,
1141 sk->sk_allocation);
1142 if (opt->dst0opt && !np->cork.opt->dst0opt)
1143 return -ENOBUFS;
1144
1145 np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt,
1146 sk->sk_allocation);
1147 if (opt->dst1opt && !np->cork.opt->dst1opt)
1148 return -ENOBUFS;
1149
1150 np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt,
1151 sk->sk_allocation);
1152 if (opt->hopopt && !np->cork.opt->hopopt)
1153 return -ENOBUFS;
1154
1155 np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt,
1156 sk->sk_allocation);
1157 if (opt->srcrt && !np->cork.opt->srcrt)
1158 return -ENOBUFS;
1159
1160
1161 }
1162 dst_hold(&rt->dst);
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) {
1170 if (np->frag_size)
1171 mtu = np->frag_size;
1172 }
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;
1183 } else {
1184 rt = (struct rt6_info *)inet->cork.dst;
1185 fl = &inet->cork.fl;
1186 opt = np->cork.opt;
1187 transhdrlen = 0;
1188 exthdrlen = 0;
1189 mtu = inet->cork.fragsize;
1190 }
1191
1192 hh_len = LL_RESERVED_SPACE(rt->dst.dev);
1193
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);
1197
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);
1201 return -EMSGSIZE;
1202 }
1203 }
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221 inet->cork.length += length;
1222 if (length > mtu) {
1223 int proto = sk->sk_protocol;
1224 if (dontfrag && (proto == IPPROTO_UDP || proto == IPPROTO_RAW)){
1225 ipv6_local_rxpmtu(sk, fl, mtu-exthdrlen);
1226 return -EMSGSIZE;
1227 }
1228
1229 if (proto == IPPROTO_UDP &&
1230 (rt->dst.dev->features & NETIF_F_UFO)) {
1231
1232 err = ip6_ufo_append_data(sk, getfrag, from, length,
1233 hh_len, fragheaderlen,
1234 transhdrlen, mtu, flags);
1235 if (err)
1236 goto error;
1237 return 0;
1238 }
1239 }
1240
1241 if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL)
1242 goto alloc_new_skb;
1243
1244 while (length > 0) {
1245
1246 copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
1247 if (copy < length)
1248 copy = maxfraglen - skb->len;
1249
1250 if (copy <= 0) {
1251 char *data;
1252 unsigned int datalen;
1253 unsigned int fraglen;
1254 unsigned int fraggap;
1255 unsigned int alloclen;
1256 struct sk_buff *skb_prev;
1257alloc_new_skb:
1258 skb_prev = skb;
1259
1260
1261 if (skb_prev)
1262 fraggap = skb_prev->len - maxfraglen;
1263 else
1264 fraggap = 0;
1265
1266
1267
1268
1269
1270 datalen = length + fraggap;
1271 if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
1272 datalen = maxfraglen - fragheaderlen;
1273
1274 fraglen = datalen + fragheaderlen;
1275 if ((flags & MSG_MORE) &&
1276 !(rt->dst.dev->features&NETIF_F_SG))
1277 alloclen = mtu;
1278 else
1279 alloclen = datalen + fragheaderlen;
1280
1281
1282
1283
1284
1285
1286 if (datalen == length + fraggap)
1287 alloclen += rt->dst.trailer_len;
1288
1289
1290
1291
1292
1293
1294 alloclen += sizeof(struct frag_hdr);
1295
1296 if (transhdrlen) {
1297 skb = sock_alloc_send_skb(sk,
1298 alloclen + hh_len,
1299 (flags & MSG_DONTWAIT), &err);
1300 } else {
1301 skb = NULL;
1302 if (atomic_read(&sk->sk_wmem_alloc) <=
1303 2 * sk->sk_sndbuf)
1304 skb = sock_wmalloc(sk,
1305 alloclen + hh_len, 1,
1306 sk->sk_allocation);
1307 if (unlikely(skb == NULL))
1308 err = -ENOBUFS;
1309 }
1310 if (skb == NULL)
1311 goto error;
1312
1313
1314
1315 skb->ip_summed = csummode;
1316 skb->csum = 0;
1317
1318 skb_reserve(skb, hh_len+sizeof(struct frag_hdr));
1319
1320
1321
1322
1323 data = skb_put(skb, fraglen);
1324 skb_set_network_header(skb, exthdrlen);
1325 data += fragheaderlen;
1326 skb->transport_header = (skb->network_header +
1327 fragheaderlen);
1328 if (fraggap) {
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,
1333 skb->csum);
1334 data += fraggap;
1335 pskb_trim_unique(skb_prev, maxfraglen);
1336 }
1337 copy = datalen - transhdrlen - fraggap;
1338 if (copy < 0) {
1339 err = -EINVAL;
1340 kfree_skb(skb);
1341 goto error;
1342 } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) {
1343 err = -EFAULT;
1344 kfree_skb(skb);
1345 goto error;
1346 }
1347
1348 offset += copy;
1349 length -= datalen - fraggap;
1350 transhdrlen = 0;
1351 exthdrlen = 0;
1352 csummode = CHECKSUM_NONE;
1353
1354
1355
1356
1357 __skb_queue_tail(&sk->sk_write_queue, skb);
1358 continue;
1359 }
1360
1361 if (copy > length)
1362 copy = length;
1363
1364 if (!(rt->dst.dev->features&NETIF_F_SG)) {
1365 unsigned int off;
1366
1367 off = skb->len;
1368 if (getfrag(from, skb_put(skb, copy),
1369 offset, copy, off, skb) < 0) {
1370 __skb_trim(skb, off);
1371 err = -EFAULT;
1372 goto error;
1373 }
1374 } else {
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;
1379 unsigned int left;
1380
1381 if (page && (left = PAGE_SIZE - off) > 0) {
1382 if (copy >= left)
1383 copy = left;
1384 if (page != frag->page) {
1385 if (i == MAX_SKB_FRAGS) {
1386 err = -EMSGSIZE;
1387 goto error;
1388 }
1389 get_page(page);
1390 skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0);
1391 frag = &skb_shinfo(skb)->frags[i];
1392 }
1393 } else if(i < MAX_SKB_FRAGS) {
1394 if (copy > PAGE_SIZE)
1395 copy = PAGE_SIZE;
1396 page = alloc_pages(sk->sk_allocation, 0);
1397 if (page == NULL) {
1398 err = -ENOMEM;
1399 goto error;
1400 }
1401 sk->sk_sndmsg_page = page;
1402 sk->sk_sndmsg_off = 0;
1403
1404 skb_fill_page_desc(skb, i, page, 0, 0);
1405 frag = &skb_shinfo(skb)->frags[i];
1406 } else {
1407 err = -EMSGSIZE;
1408 goto error;
1409 }
1410 if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) {
1411 err = -EFAULT;
1412 goto error;
1413 }
1414 sk->sk_sndmsg_off += copy;
1415 frag->size += copy;
1416 skb->len += copy;
1417 skb->data_len += copy;
1418 skb->truesize += copy;
1419 atomic_add(copy, &sk->sk_wmem_alloc);
1420 }
1421 offset += copy;
1422 length -= copy;
1423 }
1424 return 0;
1425error:
1426 inet->cork.length -= length;
1427 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
1428 return err;
1429}
1430
1431static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np)
1432{
1433 if (np->cork.opt) {
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;
1440 }
1441
1442 if (inet->cork.dst) {
1443 dst_release(inet->cork.dst);
1444 inet->cork.dst = NULL;
1445 inet->cork.flags &= ~IPCORK_ALLFRAG;
1446 }
1447 memset(&inet->cork.fl, 0, sizeof(inet->cork.fl));
1448}
1449
1450int ip6_push_pending_frames(struct sock *sk)
1451{
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;
1463 int err = 0;
1464
1465 if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL)
1466 goto out;
1467 tail_skb = &(skb_shinfo(skb)->frag_list);
1468
1469
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;
1480 tmp_skb->sk = NULL;
1481 }
1482
1483
1484 if (np->pmtudisc < IPV6_PMTUDISC_DO)
1485 skb->local_df = 1;
1486
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);
1493
1494 skb_push(skb, sizeof(struct ipv6hdr));
1495 skb_reset_network_header(skb);
1496 hdr = ipv6_hdr(skb);
1497
1498 *(__be32*)hdr = fl->fl6_flowlabel |
1499 htonl(0x60000000 | ((int)np->cork.tclass << 20));
1500
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);
1505
1506 skb->priority = sk->sk_priority;
1507 skb->mark = sk->sk_mark;
1508
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));
1513
1514 ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type);
1515 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1516 }
1517
1518 err = ip6_local_out(skb);
1519 if (err) {
1520 if (err > 0)
1521 err = net_xmit_errno(err);
1522 if (err)
1523 goto error;
1524 }
1525
1526out:
1527 ip6_cork_release(inet, np);
1528 return err;
1529error:
1530 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
1531 goto out;
1532}
1533
1534void ip6_flush_pending_frames(struct sock *sk)
1535{
1536 struct sk_buff *skb;
1537
1538 while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) {
1539 if (skb_dst(skb))
1540 IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
1541 IPSTATS_MIB_OUTDISCARDS);
1542 kfree_skb(skb);
1543 }
1544
1545 ip6_cork_release(inet_sk(sk), inet6_sk(sk));
1546}
1547