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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#include <net/l3mdev.h>
59#include <net/lwtunnel.h>
60
61static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
62{
63 struct dst_entry *dst = skb_dst(skb);
64 struct net_device *dev = dst->dev;
65 struct neighbour *neigh;
66 struct in6_addr *nexthop;
67 int ret;
68
69 skb->protocol = htons(ETH_P_IPV6);
70 skb->dev = dev;
71
72 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
73 struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
74
75 if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&
76 ((mroute6_socket(net, skb) &&
77 !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
78 ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
79 &ipv6_hdr(skb)->saddr))) {
80 struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
81
82
83
84
85 if (newskb)
86 NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,
87 net, sk, newskb, NULL, newskb->dev,
88 dev_loopback_xmit);
89
90 if (ipv6_hdr(skb)->hop_limit == 0) {
91 IP6_INC_STATS(net, idev,
92 IPSTATS_MIB_OUTDISCARDS);
93 kfree_skb(skb);
94 return 0;
95 }
96 }
97
98 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len);
99
100 if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <=
101 IPV6_ADDR_SCOPE_NODELOCAL &&
102 !(dev->flags & IFF_LOOPBACK)) {
103 kfree_skb(skb);
104 return 0;
105 }
106 }
107
108 if (lwtunnel_xmit_redirect(dst->lwtstate)) {
109 int res = lwtunnel_xmit(skb);
110
111 if (res < 0 || res == LWTUNNEL_XMIT_DONE)
112 return res;
113 }
114
115 rcu_read_lock_bh();
116 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
117 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
118 if (unlikely(!neigh))
119 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
120 if (!IS_ERR(neigh)) {
121 ret = dst_neigh_output(dst, neigh, skb);
122 rcu_read_unlock_bh();
123 return ret;
124 }
125 rcu_read_unlock_bh();
126
127 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
128 kfree_skb(skb);
129 return -EINVAL;
130}
131
132static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
133{
134 if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
135 dst_allfrag(skb_dst(skb)) ||
136 (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
137 return ip6_fragment(net, sk, skb, ip6_finish_output2);
138 else
139 return ip6_finish_output2(net, sk, skb);
140}
141
142int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
143{
144 struct net_device *dev = skb_dst(skb)->dev;
145 struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
146
147 if (unlikely(idev->cnf.disable_ipv6)) {
148 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
149 kfree_skb(skb);
150 return 0;
151 }
152
153 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
154 net, sk, skb, NULL, dev,
155 ip6_finish_output,
156 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
157}
158
159
160
161
162
163
164
165int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
166 struct ipv6_txoptions *opt, int tclass)
167{
168 struct net *net = sock_net(sk);
169 const struct ipv6_pinfo *np = inet6_sk(sk);
170 struct in6_addr *first_hop = &fl6->daddr;
171 struct dst_entry *dst = skb_dst(skb);
172 struct ipv6hdr *hdr;
173 u8 proto = fl6->flowi6_proto;
174 int seg_len = skb->len;
175 int hlimit = -1;
176 u32 mtu;
177
178 if (opt) {
179 unsigned int head_room;
180
181
182
183
184 head_room = opt->opt_nflen + opt->opt_flen;
185 seg_len += head_room;
186 head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev);
187
188 if (skb_headroom(skb) < head_room) {
189 struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
190 if (!skb2) {
191 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
192 IPSTATS_MIB_OUTDISCARDS);
193 kfree_skb(skb);
194 return -ENOBUFS;
195 }
196 consume_skb(skb);
197 skb = skb2;
198
199
200
201 skb_set_owner_w(skb, (struct sock *)sk);
202 }
203 if (opt->opt_flen)
204 ipv6_push_frag_opts(skb, opt, &proto);
205 if (opt->opt_nflen)
206 ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop);
207 }
208
209 skb_push(skb, sizeof(struct ipv6hdr));
210 skb_reset_network_header(skb);
211 hdr = ipv6_hdr(skb);
212
213
214
215
216 if (np)
217 hlimit = np->hop_limit;
218 if (hlimit < 0)
219 hlimit = ip6_dst_hoplimit(dst);
220
221 ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel,
222 np->autoflowlabel, fl6));
223
224 hdr->payload_len = htons(seg_len);
225 hdr->nexthdr = proto;
226 hdr->hop_limit = hlimit;
227
228 hdr->saddr = fl6->saddr;
229 hdr->daddr = *first_hop;
230
231 skb->protocol = htons(ETH_P_IPV6);
232 skb->priority = sk->sk_priority;
233 skb->mark = sk->sk_mark;
234
235 mtu = dst_mtu(dst);
236 if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {
237 IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)),
238 IPSTATS_MIB_OUT, skb->len);
239
240
241
242
243 skb = l3mdev_ip6_out((struct sock *)sk, skb);
244 if (unlikely(!skb))
245 return 0;
246
247
248
249
250 return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
251 net, (struct sock *)sk, skb, NULL, dst->dev,
252 dst_output);
253 }
254
255 skb->dev = dst->dev;
256
257
258
259 ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu);
260
261 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS);
262 kfree_skb(skb);
263 return -EMSGSIZE;
264}
265EXPORT_SYMBOL(ip6_xmit);
266
267static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
268{
269 struct ip6_ra_chain *ra;
270 struct sock *last = NULL;
271
272 read_lock(&ip6_ra_lock);
273 for (ra = ip6_ra_chain; ra; ra = ra->next) {
274 struct sock *sk = ra->sk;
275 if (sk && ra->sel == sel &&
276 (!sk->sk_bound_dev_if ||
277 sk->sk_bound_dev_if == skb->dev->ifindex)) {
278 if (last) {
279 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
280 if (skb2)
281 rawv6_rcv(last, skb2);
282 }
283 last = sk;
284 }
285 }
286
287 if (last) {
288 rawv6_rcv(last, skb);
289 read_unlock(&ip6_ra_lock);
290 return 1;
291 }
292 read_unlock(&ip6_ra_lock);
293 return 0;
294}
295
296static int ip6_forward_proxy_check(struct sk_buff *skb)
297{
298 struct ipv6hdr *hdr = ipv6_hdr(skb);
299 u8 nexthdr = hdr->nexthdr;
300 __be16 frag_off;
301 int offset;
302
303 if (ipv6_ext_hdr(nexthdr)) {
304 offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off);
305 if (offset < 0)
306 return 0;
307 } else
308 offset = sizeof(struct ipv6hdr);
309
310 if (nexthdr == IPPROTO_ICMPV6) {
311 struct icmp6hdr *icmp6;
312
313 if (!pskb_may_pull(skb, (skb_network_header(skb) +
314 offset + 1 - skb->data)))
315 return 0;
316
317 icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
318
319 switch (icmp6->icmp6_type) {
320 case NDISC_ROUTER_SOLICITATION:
321 case NDISC_ROUTER_ADVERTISEMENT:
322 case NDISC_NEIGHBOUR_SOLICITATION:
323 case NDISC_NEIGHBOUR_ADVERTISEMENT:
324 case NDISC_REDIRECT:
325
326
327
328
329 return 1;
330 default:
331 break;
332 }
333 }
334
335
336
337
338
339
340 if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
341 dst_link_failure(skb);
342 return -1;
343 }
344
345 return 0;
346}
347
348static inline int ip6_forward_finish(struct net *net, struct sock *sk,
349 struct sk_buff *skb)
350{
351 return dst_output(net, sk, skb);
352}
353
354static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
355{
356 unsigned int mtu;
357 struct inet6_dev *idev;
358
359 if (dst_metric_locked(dst, RTAX_MTU)) {
360 mtu = dst_metric_raw(dst, RTAX_MTU);
361 if (mtu)
362 return mtu;
363 }
364
365 mtu = IPV6_MIN_MTU;
366 rcu_read_lock();
367 idev = __in6_dev_get(dst->dev);
368 if (idev)
369 mtu = idev->cnf.mtu6;
370 rcu_read_unlock();
371
372 return mtu;
373}
374
375static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
376{
377 if (skb->len <= mtu)
378 return false;
379
380
381 if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)
382 return true;
383
384 if (skb->ignore_df)
385 return false;
386
387 if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu))
388 return false;
389
390 return true;
391}
392
393int ip6_forward(struct sk_buff *skb)
394{
395 struct dst_entry *dst = skb_dst(skb);
396 struct ipv6hdr *hdr = ipv6_hdr(skb);
397 struct inet6_skb_parm *opt = IP6CB(skb);
398 struct net *net = dev_net(dst->dev);
399 u32 mtu;
400
401 if (net->ipv6.devconf_all->forwarding == 0)
402 goto error;
403
404 if (skb->pkt_type != PACKET_HOST)
405 goto drop;
406
407 if (unlikely(skb->sk))
408 goto drop;
409
410 if (skb_warn_if_lro(skb))
411 goto drop;
412
413 if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
414 __IP6_INC_STATS(net, ip6_dst_idev(dst),
415 IPSTATS_MIB_INDISCARDS);
416 goto drop;
417 }
418
419 skb_forward_csum(skb);
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434 if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
435 if (ip6_call_ra_chain(skb, ntohs(opt->ra)))
436 return 0;
437 }
438
439
440
441
442 if (hdr->hop_limit <= 1) {
443
444 skb->dev = dst->dev;
445 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0);
446 __IP6_INC_STATS(net, ip6_dst_idev(dst),
447 IPSTATS_MIB_INHDRERRORS);
448
449 kfree_skb(skb);
450 return -ETIMEDOUT;
451 }
452
453
454 if (net->ipv6.devconf_all->proxy_ndp &&
455 pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
456 int proxied = ip6_forward_proxy_check(skb);
457 if (proxied > 0)
458 return ip6_input(skb);
459 else if (proxied < 0) {
460 __IP6_INC_STATS(net, ip6_dst_idev(dst),
461 IPSTATS_MIB_INDISCARDS);
462 goto drop;
463 }
464 }
465
466 if (!xfrm6_route_forward(skb)) {
467 __IP6_INC_STATS(net, ip6_dst_idev(dst),
468 IPSTATS_MIB_INDISCARDS);
469 goto drop;
470 }
471 dst = skb_dst(skb);
472
473
474
475
476
477 if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) {
478 struct in6_addr *target = NULL;
479 struct inet_peer *peer;
480 struct rt6_info *rt;
481
482
483
484
485
486
487 rt = (struct rt6_info *) dst;
488 if (rt->rt6i_flags & RTF_GATEWAY)
489 target = &rt->rt6i_gateway;
490 else
491 target = &hdr->daddr;
492
493 peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1);
494
495
496
497
498 if (inet_peer_xrlim_allow(peer, 1*HZ))
499 ndisc_send_redirect(skb, target);
500 if (peer)
501 inet_putpeer(peer);
502 } else {
503 int addrtype = ipv6_addr_type(&hdr->saddr);
504
505
506 if (addrtype == IPV6_ADDR_ANY ||
507 addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK))
508 goto error;
509 if (addrtype & IPV6_ADDR_LINKLOCAL) {
510 icmpv6_send(skb, ICMPV6_DEST_UNREACH,
511 ICMPV6_NOT_NEIGHBOUR, 0);
512 goto error;
513 }
514 }
515
516 mtu = ip6_dst_mtu_forward(dst);
517 if (mtu < IPV6_MIN_MTU)
518 mtu = IPV6_MIN_MTU;
519
520 if (ip6_pkt_too_big(skb, mtu)) {
521
522 skb->dev = dst->dev;
523 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
524 __IP6_INC_STATS(net, ip6_dst_idev(dst),
525 IPSTATS_MIB_INTOOBIGERRORS);
526 __IP6_INC_STATS(net, ip6_dst_idev(dst),
527 IPSTATS_MIB_FRAGFAILS);
528 kfree_skb(skb);
529 return -EMSGSIZE;
530 }
531
532 if (skb_cow(skb, dst->dev->hard_header_len)) {
533 __IP6_INC_STATS(net, ip6_dst_idev(dst),
534 IPSTATS_MIB_OUTDISCARDS);
535 goto drop;
536 }
537
538 hdr = ipv6_hdr(skb);
539
540
541
542 hdr->hop_limit--;
543
544 __IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
545 __IP6_ADD_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len);
546 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
547 net, NULL, skb, skb->dev, dst->dev,
548 ip6_forward_finish);
549
550error:
551 __IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS);
552drop:
553 kfree_skb(skb);
554 return -EINVAL;
555}
556
557static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
558{
559 to->pkt_type = from->pkt_type;
560 to->priority = from->priority;
561 to->protocol = from->protocol;
562 skb_dst_drop(to);
563 skb_dst_set(to, dst_clone(skb_dst(from)));
564 to->dev = from->dev;
565 to->mark = from->mark;
566
567#ifdef CONFIG_NET_SCHED
568 to->tc_index = from->tc_index;
569#endif
570 nf_copy(to, from);
571 skb_copy_secmark(to, from);
572}
573
574int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
575 int (*output)(struct net *, struct sock *, struct sk_buff *))
576{
577 struct sk_buff *frag;
578 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
579 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
580 inet6_sk(skb->sk) : NULL;
581 struct ipv6hdr *tmp_hdr;
582 struct frag_hdr *fh;
583 unsigned int mtu, hlen, left, len;
584 int hroom, troom;
585 __be32 frag_id;
586 int ptr, offset = 0, err = 0;
587 u8 *prevhdr, nexthdr = 0;
588
589 hlen = ip6_find_1stfragopt(skb, &prevhdr);
590 nexthdr = *prevhdr;
591
592 mtu = ip6_skb_dst_mtu(skb);
593
594
595
596
597 if (unlikely(!skb->ignore_df && skb->len > mtu))
598 goto fail_toobig;
599
600 if (IP6CB(skb)->frag_max_size) {
601 if (IP6CB(skb)->frag_max_size > mtu)
602 goto fail_toobig;
603
604
605 mtu = IP6CB(skb)->frag_max_size;
606 if (mtu < IPV6_MIN_MTU)
607 mtu = IPV6_MIN_MTU;
608 }
609
610 if (np && np->frag_size < mtu) {
611 if (np->frag_size)
612 mtu = np->frag_size;
613 }
614 if (mtu < hlen + sizeof(struct frag_hdr) + 8)
615 goto fail_toobig;
616 mtu -= hlen + sizeof(struct frag_hdr);
617
618 frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr,
619 &ipv6_hdr(skb)->saddr);
620
621 if (skb->ip_summed == CHECKSUM_PARTIAL &&
622 (err = skb_checksum_help(skb)))
623 goto fail;
624
625 hroom = LL_RESERVED_SPACE(rt->dst.dev);
626 if (skb_has_frag_list(skb)) {
627 int first_len = skb_pagelen(skb);
628 struct sk_buff *frag2;
629
630 if (first_len - hlen > mtu ||
631 ((first_len - hlen) & 7) ||
632 skb_cloned(skb) ||
633 skb_headroom(skb) < (hroom + sizeof(struct frag_hdr)))
634 goto slow_path;
635
636 skb_walk_frags(skb, frag) {
637
638 if (frag->len > mtu ||
639 ((frag->len & 7) && frag->next) ||
640 skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr)))
641 goto slow_path_clean;
642
643
644 if (skb_shared(frag))
645 goto slow_path_clean;
646
647 BUG_ON(frag->sk);
648 if (skb->sk) {
649 frag->sk = skb->sk;
650 frag->destructor = sock_wfree;
651 }
652 skb->truesize -= frag->truesize;
653 }
654
655 err = 0;
656 offset = 0;
657
658
659 *prevhdr = NEXTHDR_FRAGMENT;
660 tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
661 if (!tmp_hdr) {
662 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
663 IPSTATS_MIB_FRAGFAILS);
664 err = -ENOMEM;
665 goto fail;
666 }
667 frag = skb_shinfo(skb)->frag_list;
668 skb_frag_list_init(skb);
669
670 __skb_pull(skb, hlen);
671 fh = (struct frag_hdr *)__skb_push(skb, sizeof(struct frag_hdr));
672 __skb_push(skb, hlen);
673 skb_reset_network_header(skb);
674 memcpy(skb_network_header(skb), tmp_hdr, hlen);
675
676 fh->nexthdr = nexthdr;
677 fh->reserved = 0;
678 fh->frag_off = htons(IP6_MF);
679 fh->identification = frag_id;
680
681 first_len = skb_pagelen(skb);
682 skb->data_len = first_len - skb_headlen(skb);
683 skb->len = first_len;
684 ipv6_hdr(skb)->payload_len = htons(first_len -
685 sizeof(struct ipv6hdr));
686
687 dst_hold(&rt->dst);
688
689 for (;;) {
690
691
692 if (frag) {
693 frag->ip_summed = CHECKSUM_NONE;
694 skb_reset_transport_header(frag);
695 fh = (struct frag_hdr *)__skb_push(frag, sizeof(struct frag_hdr));
696 __skb_push(frag, hlen);
697 skb_reset_network_header(frag);
698 memcpy(skb_network_header(frag), tmp_hdr,
699 hlen);
700 offset += skb->len - hlen - sizeof(struct frag_hdr);
701 fh->nexthdr = nexthdr;
702 fh->reserved = 0;
703 fh->frag_off = htons(offset);
704 if (frag->next)
705 fh->frag_off |= htons(IP6_MF);
706 fh->identification = frag_id;
707 ipv6_hdr(frag)->payload_len =
708 htons(frag->len -
709 sizeof(struct ipv6hdr));
710 ip6_copy_metadata(frag, skb);
711 }
712
713 err = output(net, sk, skb);
714 if (!err)
715 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
716 IPSTATS_MIB_FRAGCREATES);
717
718 if (err || !frag)
719 break;
720
721 skb = frag;
722 frag = skb->next;
723 skb->next = NULL;
724 }
725
726 kfree(tmp_hdr);
727
728 if (err == 0) {
729 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
730 IPSTATS_MIB_FRAGOKS);
731 ip6_rt_put(rt);
732 return 0;
733 }
734
735 kfree_skb_list(frag);
736
737 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
738 IPSTATS_MIB_FRAGFAILS);
739 ip6_rt_put(rt);
740 return err;
741
742slow_path_clean:
743 skb_walk_frags(skb, frag2) {
744 if (frag2 == frag)
745 break;
746 frag2->sk = NULL;
747 frag2->destructor = NULL;
748 skb->truesize += frag2->truesize;
749 }
750 }
751
752slow_path:
753 left = skb->len - hlen;
754 ptr = hlen;
755
756
757
758
759
760 *prevhdr = NEXTHDR_FRAGMENT;
761 troom = rt->dst.dev->needed_tailroom;
762
763
764
765
766 while (left > 0) {
767 len = left;
768
769 if (len > mtu)
770 len = mtu;
771
772
773 if (len < left) {
774 len &= ~7;
775 }
776
777
778 frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) +
779 hroom + troom, GFP_ATOMIC);
780 if (!frag) {
781 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
782 IPSTATS_MIB_FRAGFAILS);
783 err = -ENOMEM;
784 goto fail;
785 }
786
787
788
789
790
791 ip6_copy_metadata(frag, skb);
792 skb_reserve(frag, hroom);
793 skb_put(frag, len + hlen + sizeof(struct frag_hdr));
794 skb_reset_network_header(frag);
795 fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
796 frag->transport_header = (frag->network_header + hlen +
797 sizeof(struct frag_hdr));
798
799
800
801
802
803 if (skb->sk)
804 skb_set_owner_w(frag, skb->sk);
805
806
807
808
809 skb_copy_from_linear_data(skb, skb_network_header(frag), hlen);
810
811
812
813
814 fh->nexthdr = nexthdr;
815 fh->reserved = 0;
816 fh->identification = frag_id;
817
818
819
820
821 BUG_ON(skb_copy_bits(skb, ptr, skb_transport_header(frag),
822 len));
823 left -= len;
824
825 fh->frag_off = htons(offset);
826 if (left > 0)
827 fh->frag_off |= htons(IP6_MF);
828 ipv6_hdr(frag)->payload_len = htons(frag->len -
829 sizeof(struct ipv6hdr));
830
831 ptr += len;
832 offset += len;
833
834
835
836
837 err = output(net, sk, frag);
838 if (err)
839 goto fail;
840
841 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
842 IPSTATS_MIB_FRAGCREATES);
843 }
844 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
845 IPSTATS_MIB_FRAGOKS);
846 consume_skb(skb);
847 return err;
848
849fail_toobig:
850 if (skb->sk && dst_allfrag(skb_dst(skb)))
851 sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
852
853 skb->dev = skb_dst(skb)->dev;
854 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
855 err = -EMSGSIZE;
856
857fail:
858 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
859 IPSTATS_MIB_FRAGFAILS);
860 kfree_skb(skb);
861 return err;
862}
863
864static inline int ip6_rt_check(const struct rt6key *rt_key,
865 const struct in6_addr *fl_addr,
866 const struct in6_addr *addr_cache)
867{
868 return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&
869 (!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache));
870}
871
872static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
873 struct dst_entry *dst,
874 const struct flowi6 *fl6)
875{
876 struct ipv6_pinfo *np = inet6_sk(sk);
877 struct rt6_info *rt;
878
879 if (!dst)
880 goto out;
881
882 if (dst->ops->family != AF_INET6) {
883 dst_release(dst);
884 return NULL;
885 }
886
887 rt = (struct rt6_info *)dst;
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905 if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) ||
906#ifdef CONFIG_IPV6_SUBTREES
907 ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) ||
908#endif
909 (!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) &&
910 (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) {
911 dst_release(dst);
912 dst = NULL;
913 }
914
915out:
916 return dst;
917}
918
919static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
920 struct dst_entry **dst, struct flowi6 *fl6)
921{
922#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
923 struct neighbour *n;
924 struct rt6_info *rt;
925#endif
926 int err;
927 int flags = 0;
928
929
930
931
932
933
934
935
936
937
938 if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) {
939 struct rt6_info *rt;
940 bool had_dst = *dst != NULL;
941
942 if (!had_dst)
943 *dst = ip6_route_output(net, sk, fl6);
944 rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
945 err = ip6_route_get_saddr(net, rt, &fl6->daddr,
946 sk ? inet6_sk(sk)->srcprefs : 0,
947 &fl6->saddr);
948 if (err)
949 goto out_err_release;
950
951
952
953
954
955 if (!had_dst && (*dst)->error) {
956 dst_release(*dst);
957 *dst = NULL;
958 }
959
960 if (fl6->flowi6_oif)
961 flags |= RT6_LOOKUP_F_IFACE;
962 }
963
964 if (!*dst)
965 *dst = ip6_route_output_flags(net, sk, fl6, flags);
966
967 err = (*dst)->error;
968 if (err)
969 goto out_err_release;
970
971#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
972
973
974
975
976
977
978
979
980 rt = (struct rt6_info *) *dst;
981 rcu_read_lock_bh();
982 n = __ipv6_neigh_lookup_noref(rt->dst.dev,
983 rt6_nexthop(rt, &fl6->daddr));
984 err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0;
985 rcu_read_unlock_bh();
986
987 if (err) {
988 struct inet6_ifaddr *ifp;
989 struct flowi6 fl_gw6;
990 int redirect;
991
992 ifp = ipv6_get_ifaddr(net, &fl6->saddr,
993 (*dst)->dev, 1);
994
995 redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
996 if (ifp)
997 in6_ifa_put(ifp);
998
999 if (redirect) {
1000
1001
1002
1003
1004 dst_release(*dst);
1005 memcpy(&fl_gw6, fl6, sizeof(struct flowi6));
1006 memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr));
1007 *dst = ip6_route_output(net, sk, &fl_gw6);
1008 err = (*dst)->error;
1009 if (err)
1010 goto out_err_release;
1011 }
1012 }
1013#endif
1014
1015 return 0;
1016
1017out_err_release:
1018 dst_release(*dst);
1019 *dst = NULL;
1020
1021 if (err == -ENETUNREACH)
1022 IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES);
1023 return err;
1024}
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1037 struct flowi6 *fl6)
1038{
1039 *dst = NULL;
1040 return ip6_dst_lookup_tail(net, sk, dst, fl6);
1041}
1042EXPORT_SYMBOL_GPL(ip6_dst_lookup);
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
1056 const struct in6_addr *final_dst)
1057{
1058 struct dst_entry *dst = NULL;
1059 int err;
1060
1061 err = ip6_dst_lookup_tail(sock_net(sk), sk, &dst, fl6);
1062 if (err)
1063 return ERR_PTR(err);
1064 if (final_dst)
1065 fl6->daddr = *final_dst;
1066
1067 return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
1068}
1069EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1086 const struct in6_addr *final_dst)
1087{
1088 struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
1089
1090 dst = ip6_sk_dst_check(sk, dst, fl6);
1091 if (!dst)
1092 dst = ip6_dst_lookup_flow(sk, fl6, final_dst);
1093
1094 return dst;
1095}
1096EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
1097
1098static inline int ip6_ufo_append_data(struct sock *sk,
1099 struct sk_buff_head *queue,
1100 int getfrag(void *from, char *to, int offset, int len,
1101 int odd, struct sk_buff *skb),
1102 void *from, int length, int hh_len, int fragheaderlen,
1103 int exthdrlen, int transhdrlen, int mtu,
1104 unsigned int flags, const struct flowi6 *fl6)
1105
1106{
1107 struct sk_buff *skb;
1108 int err;
1109
1110
1111
1112
1113
1114 skb = skb_peek_tail(queue);
1115 if (!skb) {
1116 skb = sock_alloc_send_skb(sk,
1117 hh_len + fragheaderlen + transhdrlen + 20,
1118 (flags & MSG_DONTWAIT), &err);
1119 if (!skb)
1120 return err;
1121
1122
1123 skb_reserve(skb, hh_len);
1124
1125
1126 skb_put(skb, fragheaderlen + transhdrlen);
1127
1128
1129 skb_set_network_header(skb, exthdrlen);
1130
1131
1132 skb->transport_header = skb->network_header + fragheaderlen;
1133
1134 skb->protocol = htons(ETH_P_IPV6);
1135 skb->csum = 0;
1136
1137 __skb_queue_tail(queue, skb);
1138 } else if (skb_is_gso(skb)) {
1139 goto append;
1140 }
1141
1142 skb->ip_summed = CHECKSUM_PARTIAL;
1143
1144
1145
1146 skb_shinfo(skb)->gso_size = (mtu - fragheaderlen -
1147 sizeof(struct frag_hdr)) & ~7;
1148 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
1149 skb_shinfo(skb)->ip6_frag_id = ipv6_select_ident(sock_net(sk),
1150 &fl6->daddr,
1151 &fl6->saddr);
1152
1153append:
1154 return skb_append_datato_frags(sk, skb, getfrag, from,
1155 (length - transhdrlen));
1156}
1157
1158static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
1159 gfp_t gfp)
1160{
1161 return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
1162}
1163
1164static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
1165 gfp_t gfp)
1166{
1167 return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
1168}
1169
1170static void ip6_append_data_mtu(unsigned int *mtu,
1171 int *maxfraglen,
1172 unsigned int fragheaderlen,
1173 struct sk_buff *skb,
1174 struct rt6_info *rt,
1175 unsigned int orig_mtu)
1176{
1177 if (!(rt->dst.flags & DST_XFRM_TUNNEL)) {
1178 if (!skb) {
1179
1180 *mtu = orig_mtu - rt->dst.header_len;
1181
1182 } else {
1183
1184
1185
1186
1187 *mtu = orig_mtu;
1188 }
1189 *maxfraglen = ((*mtu - fragheaderlen) & ~7)
1190 + fragheaderlen - sizeof(struct frag_hdr);
1191 }
1192}
1193
1194static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
1195 struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6,
1196 struct rt6_info *rt, struct flowi6 *fl6)
1197{
1198 struct ipv6_pinfo *np = inet6_sk(sk);
1199 unsigned int mtu;
1200 struct ipv6_txoptions *opt = ipc6->opt;
1201
1202
1203
1204
1205 if (opt) {
1206 if (WARN_ON(v6_cork->opt))
1207 return -EINVAL;
1208
1209 v6_cork->opt = kzalloc(opt->tot_len, sk->sk_allocation);
1210 if (unlikely(!v6_cork->opt))
1211 return -ENOBUFS;
1212
1213 v6_cork->opt->tot_len = opt->tot_len;
1214 v6_cork->opt->opt_flen = opt->opt_flen;
1215 v6_cork->opt->opt_nflen = opt->opt_nflen;
1216
1217 v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt,
1218 sk->sk_allocation);
1219 if (opt->dst0opt && !v6_cork->opt->dst0opt)
1220 return -ENOBUFS;
1221
1222 v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt,
1223 sk->sk_allocation);
1224 if (opt->dst1opt && !v6_cork->opt->dst1opt)
1225 return -ENOBUFS;
1226
1227 v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt,
1228 sk->sk_allocation);
1229 if (opt->hopopt && !v6_cork->opt->hopopt)
1230 return -ENOBUFS;
1231
1232 v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt,
1233 sk->sk_allocation);
1234 if (opt->srcrt && !v6_cork->opt->srcrt)
1235 return -ENOBUFS;
1236
1237
1238 }
1239 dst_hold(&rt->dst);
1240 cork->base.dst = &rt->dst;
1241 cork->fl.u.ip6 = *fl6;
1242 v6_cork->hop_limit = ipc6->hlimit;
1243 v6_cork->tclass = ipc6->tclass;
1244 if (rt->dst.flags & DST_XFRM_TUNNEL)
1245 mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
1246 rt->dst.dev->mtu : dst_mtu(&rt->dst);
1247 else
1248 mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
1249 rt->dst.dev->mtu : dst_mtu(rt->dst.path);
1250 if (np->frag_size < mtu) {
1251 if (np->frag_size)
1252 mtu = np->frag_size;
1253 }
1254 cork->base.fragsize = mtu;
1255 if (dst_allfrag(rt->dst.path))
1256 cork->base.flags |= IPCORK_ALLFRAG;
1257 cork->base.length = 0;
1258
1259 return 0;
1260}
1261
1262static int __ip6_append_data(struct sock *sk,
1263 struct flowi6 *fl6,
1264 struct sk_buff_head *queue,
1265 struct inet_cork *cork,
1266 struct inet6_cork *v6_cork,
1267 struct page_frag *pfrag,
1268 int getfrag(void *from, char *to, int offset,
1269 int len, int odd, struct sk_buff *skb),
1270 void *from, int length, int transhdrlen,
1271 unsigned int flags, struct ipcm6_cookie *ipc6,
1272 const struct sockcm_cookie *sockc)
1273{
1274 struct sk_buff *skb, *skb_prev = NULL;
1275 unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu;
1276 int exthdrlen = 0;
1277 int dst_exthdrlen = 0;
1278 int hh_len;
1279 int copy;
1280 int err;
1281 int offset = 0;
1282 __u8 tx_flags = 0;
1283 u32 tskey = 0;
1284 struct rt6_info *rt = (struct rt6_info *)cork->dst;
1285 struct ipv6_txoptions *opt = v6_cork->opt;
1286 int csummode = CHECKSUM_NONE;
1287 unsigned int maxnonfragsize, headersize;
1288
1289 skb = skb_peek_tail(queue);
1290 if (!skb) {
1291 exthdrlen = opt ? opt->opt_flen : 0;
1292 dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
1293 }
1294
1295 mtu = cork->fragsize;
1296 orig_mtu = mtu;
1297
1298 hh_len = LL_RESERVED_SPACE(rt->dst.dev);
1299
1300 fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
1301 (opt ? opt->opt_nflen : 0);
1302 maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -
1303 sizeof(struct frag_hdr);
1304
1305 headersize = sizeof(struct ipv6hdr) +
1306 (opt ? opt->opt_flen + opt->opt_nflen : 0) +
1307 (dst_allfrag(&rt->dst) ?
1308 sizeof(struct frag_hdr) : 0) +
1309 rt->rt6i_nfheader_len;
1310
1311 if (cork->length + length > mtu - headersize && ipc6->dontfrag &&
1312 (sk->sk_protocol == IPPROTO_UDP ||
1313 sk->sk_protocol == IPPROTO_RAW)) {
1314 ipv6_local_rxpmtu(sk, fl6, mtu - headersize +
1315 sizeof(struct ipv6hdr));
1316 goto emsgsize;
1317 }
1318
1319 if (ip6_sk_ignore_df(sk))
1320 maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN;
1321 else
1322 maxnonfragsize = mtu;
1323
1324 if (cork->length + length > maxnonfragsize - headersize) {
1325emsgsize:
1326 ipv6_local_error(sk, EMSGSIZE, fl6,
1327 mtu - headersize +
1328 sizeof(struct ipv6hdr));
1329 return -EMSGSIZE;
1330 }
1331
1332
1333
1334
1335 if (transhdrlen && sk->sk_protocol == IPPROTO_UDP &&
1336 headersize == sizeof(struct ipv6hdr) &&
1337 length < mtu - headersize &&
1338 !(flags & MSG_MORE) &&
1339 rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
1340 csummode = CHECKSUM_PARTIAL;
1341
1342 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_RAW) {
1343 sock_tx_timestamp(sk, sockc->tsflags, &tx_flags);
1344 if (tx_flags & SKBTX_ANY_SW_TSTAMP &&
1345 sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)
1346 tskey = sk->sk_tskey++;
1347 }
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365 cork->length += length;
1366 if (((length > mtu) ||
1367 (skb && skb_is_gso(skb))) &&
1368 (sk->sk_protocol == IPPROTO_UDP) &&
1369 (rt->dst.dev->features & NETIF_F_UFO) && !rt->dst.header_len &&
1370 (sk->sk_type == SOCK_DGRAM) && !udp_get_no_check6_tx(sk)) {
1371 err = ip6_ufo_append_data(sk, queue, getfrag, from, length,
1372 hh_len, fragheaderlen, exthdrlen,
1373 transhdrlen, mtu, flags, fl6);
1374 if (err)
1375 goto error;
1376 return 0;
1377 }
1378
1379 if (!skb)
1380 goto alloc_new_skb;
1381
1382 while (length > 0) {
1383
1384 copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
1385 if (copy < length)
1386 copy = maxfraglen - skb->len;
1387
1388 if (copy <= 0) {
1389 char *data;
1390 unsigned int datalen;
1391 unsigned int fraglen;
1392 unsigned int fraggap;
1393 unsigned int alloclen;
1394alloc_new_skb:
1395
1396 if (skb)
1397 fraggap = skb->len - maxfraglen;
1398 else
1399 fraggap = 0;
1400
1401 if (!skb || !skb_prev)
1402 ip6_append_data_mtu(&mtu, &maxfraglen,
1403 fragheaderlen, skb, rt,
1404 orig_mtu);
1405
1406 skb_prev = skb;
1407
1408
1409
1410
1411
1412 datalen = length + fraggap;
1413
1414 if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
1415 datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len;
1416 if ((flags & MSG_MORE) &&
1417 !(rt->dst.dev->features&NETIF_F_SG))
1418 alloclen = mtu;
1419 else
1420 alloclen = datalen + fragheaderlen;
1421
1422 alloclen += dst_exthdrlen;
1423
1424 if (datalen != length + fraggap) {
1425
1426
1427
1428
1429 datalen += rt->dst.trailer_len;
1430 }
1431
1432 alloclen += rt->dst.trailer_len;
1433 fraglen = datalen + fragheaderlen;
1434
1435
1436
1437
1438
1439
1440 alloclen += sizeof(struct frag_hdr);
1441
1442 if (transhdrlen) {
1443 skb = sock_alloc_send_skb(sk,
1444 alloclen + hh_len,
1445 (flags & MSG_DONTWAIT), &err);
1446 } else {
1447 skb = NULL;
1448 if (atomic_read(&sk->sk_wmem_alloc) <=
1449 2 * sk->sk_sndbuf)
1450 skb = sock_wmalloc(sk,
1451 alloclen + hh_len, 1,
1452 sk->sk_allocation);
1453 if (unlikely(!skb))
1454 err = -ENOBUFS;
1455 }
1456 if (!skb)
1457 goto error;
1458
1459
1460
1461 skb->protocol = htons(ETH_P_IPV6);
1462 skb->ip_summed = csummode;
1463 skb->csum = 0;
1464
1465 skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
1466 dst_exthdrlen);
1467
1468
1469 skb_shinfo(skb)->tx_flags = tx_flags;
1470 tx_flags = 0;
1471 skb_shinfo(skb)->tskey = tskey;
1472 tskey = 0;
1473
1474
1475
1476
1477 data = skb_put(skb, fraglen);
1478 skb_set_network_header(skb, exthdrlen);
1479 data += fragheaderlen;
1480 skb->transport_header = (skb->network_header +
1481 fragheaderlen);
1482 if (fraggap) {
1483 skb->csum = skb_copy_and_csum_bits(
1484 skb_prev, maxfraglen,
1485 data + transhdrlen, fraggap, 0);
1486 skb_prev->csum = csum_sub(skb_prev->csum,
1487 skb->csum);
1488 data += fraggap;
1489 pskb_trim_unique(skb_prev, maxfraglen);
1490 }
1491 copy = datalen - transhdrlen - fraggap;
1492
1493 if (copy < 0) {
1494 err = -EINVAL;
1495 kfree_skb(skb);
1496 goto error;
1497 } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) {
1498 err = -EFAULT;
1499 kfree_skb(skb);
1500 goto error;
1501 }
1502
1503 offset += copy;
1504 length -= datalen - fraggap;
1505 transhdrlen = 0;
1506 exthdrlen = 0;
1507 dst_exthdrlen = 0;
1508
1509
1510
1511
1512 __skb_queue_tail(queue, skb);
1513 continue;
1514 }
1515
1516 if (copy > length)
1517 copy = length;
1518
1519 if (!(rt->dst.dev->features&NETIF_F_SG)) {
1520 unsigned int off;
1521
1522 off = skb->len;
1523 if (getfrag(from, skb_put(skb, copy),
1524 offset, copy, off, skb) < 0) {
1525 __skb_trim(skb, off);
1526 err = -EFAULT;
1527 goto error;
1528 }
1529 } else {
1530 int i = skb_shinfo(skb)->nr_frags;
1531
1532 err = -ENOMEM;
1533 if (!sk_page_frag_refill(sk, pfrag))
1534 goto error;
1535
1536 if (!skb_can_coalesce(skb, i, pfrag->page,
1537 pfrag->offset)) {
1538 err = -EMSGSIZE;
1539 if (i == MAX_SKB_FRAGS)
1540 goto error;
1541
1542 __skb_fill_page_desc(skb, i, pfrag->page,
1543 pfrag->offset, 0);
1544 skb_shinfo(skb)->nr_frags = ++i;
1545 get_page(pfrag->page);
1546 }
1547 copy = min_t(int, copy, pfrag->size - pfrag->offset);
1548 if (getfrag(from,
1549 page_address(pfrag->page) + pfrag->offset,
1550 offset, copy, skb->len, skb) < 0)
1551 goto error_efault;
1552
1553 pfrag->offset += copy;
1554 skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
1555 skb->len += copy;
1556 skb->data_len += copy;
1557 skb->truesize += copy;
1558 atomic_add(copy, &sk->sk_wmem_alloc);
1559 }
1560 offset += copy;
1561 length -= copy;
1562 }
1563
1564 return 0;
1565
1566error_efault:
1567 err = -EFAULT;
1568error:
1569 cork->length -= length;
1570 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
1571 return err;
1572}
1573
1574int ip6_append_data(struct sock *sk,
1575 int getfrag(void *from, char *to, int offset, int len,
1576 int odd, struct sk_buff *skb),
1577 void *from, int length, int transhdrlen,
1578 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1579 struct rt6_info *rt, unsigned int flags,
1580 const struct sockcm_cookie *sockc)
1581{
1582 struct inet_sock *inet = inet_sk(sk);
1583 struct ipv6_pinfo *np = inet6_sk(sk);
1584 int exthdrlen;
1585 int err;
1586
1587 if (flags&MSG_PROBE)
1588 return 0;
1589 if (skb_queue_empty(&sk->sk_write_queue)) {
1590
1591
1592
1593 err = ip6_setup_cork(sk, &inet->cork, &np->cork,
1594 ipc6, rt, fl6);
1595 if (err)
1596 return err;
1597
1598 exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
1599 length += exthdrlen;
1600 transhdrlen += exthdrlen;
1601 } else {
1602 fl6 = &inet->cork.fl.u.ip6;
1603 transhdrlen = 0;
1604 }
1605
1606 return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base,
1607 &np->cork, sk_page_frag(sk), getfrag,
1608 from, length, transhdrlen, flags, ipc6, sockc);
1609}
1610EXPORT_SYMBOL_GPL(ip6_append_data);
1611
1612static void ip6_cork_release(struct inet_cork_full *cork,
1613 struct inet6_cork *v6_cork)
1614{
1615 if (v6_cork->opt) {
1616 kfree(v6_cork->opt->dst0opt);
1617 kfree(v6_cork->opt->dst1opt);
1618 kfree(v6_cork->opt->hopopt);
1619 kfree(v6_cork->opt->srcrt);
1620 kfree(v6_cork->opt);
1621 v6_cork->opt = NULL;
1622 }
1623
1624 if (cork->base.dst) {
1625 dst_release(cork->base.dst);
1626 cork->base.dst = NULL;
1627 cork->base.flags &= ~IPCORK_ALLFRAG;
1628 }
1629 memset(&cork->fl, 0, sizeof(cork->fl));
1630}
1631
1632struct sk_buff *__ip6_make_skb(struct sock *sk,
1633 struct sk_buff_head *queue,
1634 struct inet_cork_full *cork,
1635 struct inet6_cork *v6_cork)
1636{
1637 struct sk_buff *skb, *tmp_skb;
1638 struct sk_buff **tail_skb;
1639 struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
1640 struct ipv6_pinfo *np = inet6_sk(sk);
1641 struct net *net = sock_net(sk);
1642 struct ipv6hdr *hdr;
1643 struct ipv6_txoptions *opt = v6_cork->opt;
1644 struct rt6_info *rt = (struct rt6_info *)cork->base.dst;
1645 struct flowi6 *fl6 = &cork->fl.u.ip6;
1646 unsigned char proto = fl6->flowi6_proto;
1647
1648 skb = __skb_dequeue(queue);
1649 if (!skb)
1650 goto out;
1651 tail_skb = &(skb_shinfo(skb)->frag_list);
1652
1653
1654 if (skb->data < skb_network_header(skb))
1655 __skb_pull(skb, skb_network_offset(skb));
1656 while ((tmp_skb = __skb_dequeue(queue)) != NULL) {
1657 __skb_pull(tmp_skb, skb_network_header_len(skb));
1658 *tail_skb = tmp_skb;
1659 tail_skb = &(tmp_skb->next);
1660 skb->len += tmp_skb->len;
1661 skb->data_len += tmp_skb->len;
1662 skb->truesize += tmp_skb->truesize;
1663 tmp_skb->destructor = NULL;
1664 tmp_skb->sk = NULL;
1665 }
1666
1667
1668 skb->ignore_df = ip6_sk_ignore_df(sk);
1669
1670 *final_dst = fl6->daddr;
1671 __skb_pull(skb, skb_network_header_len(skb));
1672 if (opt && opt->opt_flen)
1673 ipv6_push_frag_opts(skb, opt, &proto);
1674 if (opt && opt->opt_nflen)
1675 ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);
1676
1677 skb_push(skb, sizeof(struct ipv6hdr));
1678 skb_reset_network_header(skb);
1679 hdr = ipv6_hdr(skb);
1680
1681 ip6_flow_hdr(hdr, v6_cork->tclass,
1682 ip6_make_flowlabel(net, skb, fl6->flowlabel,
1683 np->autoflowlabel, fl6));
1684 hdr->hop_limit = v6_cork->hop_limit;
1685 hdr->nexthdr = proto;
1686 hdr->saddr = fl6->saddr;
1687 hdr->daddr = *final_dst;
1688
1689 skb->priority = sk->sk_priority;
1690 skb->mark = sk->sk_mark;
1691
1692 skb_dst_set(skb, dst_clone(&rt->dst));
1693 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
1694 if (proto == IPPROTO_ICMPV6) {
1695 struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
1696
1697 ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type);
1698 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1699 }
1700
1701 ip6_cork_release(cork, v6_cork);
1702out:
1703 return skb;
1704}
1705
1706int ip6_send_skb(struct sk_buff *skb)
1707{
1708 struct net *net = sock_net(skb->sk);
1709 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
1710 int err;
1711
1712 err = ip6_local_out(net, skb->sk, skb);
1713 if (err) {
1714 if (err > 0)
1715 err = net_xmit_errno(err);
1716 if (err)
1717 IP6_INC_STATS(net, rt->rt6i_idev,
1718 IPSTATS_MIB_OUTDISCARDS);
1719 }
1720
1721 return err;
1722}
1723
1724int ip6_push_pending_frames(struct sock *sk)
1725{
1726 struct sk_buff *skb;
1727
1728 skb = ip6_finish_skb(sk);
1729 if (!skb)
1730 return 0;
1731
1732 return ip6_send_skb(skb);
1733}
1734EXPORT_SYMBOL_GPL(ip6_push_pending_frames);
1735
1736static void __ip6_flush_pending_frames(struct sock *sk,
1737 struct sk_buff_head *queue,
1738 struct inet_cork_full *cork,
1739 struct inet6_cork *v6_cork)
1740{
1741 struct sk_buff *skb;
1742
1743 while ((skb = __skb_dequeue_tail(queue)) != NULL) {
1744 if (skb_dst(skb))
1745 IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
1746 IPSTATS_MIB_OUTDISCARDS);
1747 kfree_skb(skb);
1748 }
1749
1750 ip6_cork_release(cork, v6_cork);
1751}
1752
1753void ip6_flush_pending_frames(struct sock *sk)
1754{
1755 __ip6_flush_pending_frames(sk, &sk->sk_write_queue,
1756 &inet_sk(sk)->cork, &inet6_sk(sk)->cork);
1757}
1758EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);
1759
1760struct sk_buff *ip6_make_skb(struct sock *sk,
1761 int getfrag(void *from, char *to, int offset,
1762 int len, int odd, struct sk_buff *skb),
1763 void *from, int length, int transhdrlen,
1764 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1765 struct rt6_info *rt, unsigned int flags,
1766 const struct sockcm_cookie *sockc)
1767{
1768 struct inet_cork_full cork;
1769 struct inet6_cork v6_cork;
1770 struct sk_buff_head queue;
1771 int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
1772 int err;
1773
1774 if (flags & MSG_PROBE)
1775 return NULL;
1776
1777 __skb_queue_head_init(&queue);
1778
1779 cork.base.flags = 0;
1780 cork.base.addr = 0;
1781 cork.base.opt = NULL;
1782 v6_cork.opt = NULL;
1783 err = ip6_setup_cork(sk, &cork, &v6_cork, ipc6, rt, fl6);
1784 if (err)
1785 return ERR_PTR(err);
1786
1787 if (ipc6->dontfrag < 0)
1788 ipc6->dontfrag = inet6_sk(sk)->dontfrag;
1789
1790 err = __ip6_append_data(sk, fl6, &queue, &cork.base, &v6_cork,
1791 ¤t->task_frag, getfrag, from,
1792 length + exthdrlen, transhdrlen + exthdrlen,
1793 flags, ipc6, sockc);
1794 if (err) {
1795 __ip6_flush_pending_frames(sk, &queue, &cork, &v6_cork);
1796 return ERR_PTR(err);
1797 }
1798
1799 return __ip6_make_skb(sk, &queue, &cork, &v6_cork);
1800}
1801