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>
58 #include <net/l3mdev.h>
60 static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
62 struct dst_entry *dst = skb_dst(skb);
63 struct net_device *dev = dst->dev;
64 struct neighbour *neigh;
65 struct in6_addr *nexthop;
68 skb->protocol = htons(ETH_P_IPV6);
71 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
72 struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
74 if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&
75 ((mroute6_socket(net, skb) &&
76 !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
77 ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
78 &ipv6_hdr(skb)->saddr))) {
79 struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
81 /* Do not check for IFF_ALLMULTI; multicast routing
82 is not supported in any case.
85 NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,
86 net, sk, newskb, NULL, newskb->dev,
89 if (ipv6_hdr(skb)->hop_limit == 0) {
90 IP6_INC_STATS(net, idev,
91 IPSTATS_MIB_OUTDISCARDS);
97 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len);
99 if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <=
100 IPV6_ADDR_SCOPE_NODELOCAL &&
101 !(dev->flags & IFF_LOOPBACK)) {
108 nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
109 neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
110 if (unlikely(!neigh))
111 neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
112 if (!IS_ERR(neigh)) {
113 ret = dst_neigh_output(dst, neigh, skb);
114 rcu_read_unlock_bh();
117 rcu_read_unlock_bh();
119 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
124 static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
126 if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
127 dst_allfrag(skb_dst(skb)) ||
128 (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
129 return ip6_fragment(net, sk, skb, ip6_finish_output2);
131 return ip6_finish_output2(net, sk, skb);
134 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
136 struct net_device *dev = skb_dst(skb)->dev;
137 struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
139 if (unlikely(idev->cnf.disable_ipv6)) {
140 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
145 return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
146 net, sk, skb, NULL, dev,
148 !(IP6CB(skb)->flags & IP6SKB_REROUTED));
152 * xmit an sk_buff (used by TCP, SCTP and DCCP)
153 * Note : socket lock is not held for SYNACK packets, but might be modified
154 * by calls to skb_set_owner_w() and ipv6_local_error(),
155 * which are using proper atomic operations or spinlocks.
157 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
158 struct ipv6_txoptions *opt, int tclass)
160 struct net *net = sock_net(sk);
161 const struct ipv6_pinfo *np = inet6_sk(sk);
162 struct in6_addr *first_hop = &fl6->daddr;
163 struct dst_entry *dst = skb_dst(skb);
165 u8 proto = fl6->flowi6_proto;
166 int seg_len = skb->len;
171 unsigned int head_room;
173 /* First: exthdrs may take lots of space (~8K for now)
174 MAX_HEADER is not enough.
176 head_room = opt->opt_nflen + opt->opt_flen;
177 seg_len += head_room;
178 head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev);
180 if (skb_headroom(skb) < head_room) {
181 struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
183 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
184 IPSTATS_MIB_OUTDISCARDS);
190 /* skb_set_owner_w() changes sk->sk_wmem_alloc atomically,
191 * it is safe to call in our context (socket lock not held)
193 skb_set_owner_w(skb, (struct sock *)sk);
196 ipv6_push_frag_opts(skb, opt, &proto);
198 ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop);
201 skb_push(skb, sizeof(struct ipv6hdr));
202 skb_reset_network_header(skb);
206 * Fill in the IPv6 header
209 hlimit = np->hop_limit;
211 hlimit = ip6_dst_hoplimit(dst);
213 ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel,
214 np->autoflowlabel, fl6));
216 hdr->payload_len = htons(seg_len);
217 hdr->nexthdr = proto;
218 hdr->hop_limit = hlimit;
220 hdr->saddr = fl6->saddr;
221 hdr->daddr = *first_hop;
223 skb->protocol = htons(ETH_P_IPV6);
224 skb->priority = sk->sk_priority;
225 skb->mark = sk->sk_mark;
228 if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {
229 IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)),
230 IPSTATS_MIB_OUT, skb->len);
231 /* hooks should never assume socket lock is held.
232 * we promote our socket to non const
234 return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
235 net, (struct sock *)sk, skb, NULL, dst->dev,
240 /* ipv6_local_error() does not require socket lock,
241 * we promote our socket to non const
243 ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu);
245 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS);
249 EXPORT_SYMBOL(ip6_xmit);
251 static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
253 struct ip6_ra_chain *ra;
254 struct sock *last = NULL;
256 read_lock(&ip6_ra_lock);
257 for (ra = ip6_ra_chain; ra; ra = ra->next) {
258 struct sock *sk = ra->sk;
259 if (sk && ra->sel == sel &&
260 (!sk->sk_bound_dev_if ||
261 sk->sk_bound_dev_if == skb->dev->ifindex)) {
263 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
265 rawv6_rcv(last, skb2);
272 rawv6_rcv(last, skb);
273 read_unlock(&ip6_ra_lock);
276 read_unlock(&ip6_ra_lock);
280 static int ip6_forward_proxy_check(struct sk_buff *skb)
282 struct ipv6hdr *hdr = ipv6_hdr(skb);
283 u8 nexthdr = hdr->nexthdr;
287 if (ipv6_ext_hdr(nexthdr)) {
288 offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off);
292 offset = sizeof(struct ipv6hdr);
294 if (nexthdr == IPPROTO_ICMPV6) {
295 struct icmp6hdr *icmp6;
297 if (!pskb_may_pull(skb, (skb_network_header(skb) +
298 offset + 1 - skb->data)))
301 icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
303 switch (icmp6->icmp6_type) {
304 case NDISC_ROUTER_SOLICITATION:
305 case NDISC_ROUTER_ADVERTISEMENT:
306 case NDISC_NEIGHBOUR_SOLICITATION:
307 case NDISC_NEIGHBOUR_ADVERTISEMENT:
309 /* For reaction involving unicast neighbor discovery
310 * message destined to the proxied address, pass it to
320 * The proxying router can't forward traffic sent to a link-local
321 * address, so signal the sender and discard the packet. This
322 * behavior is clarified by the MIPv6 specification.
324 if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
325 dst_link_failure(skb);
332 static inline int ip6_forward_finish(struct net *net, struct sock *sk,
335 skb_sender_cpu_clear(skb);
336 return dst_output(net, sk, skb);
339 static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
342 struct inet6_dev *idev;
344 if (dst_metric_locked(dst, RTAX_MTU)) {
345 mtu = dst_metric_raw(dst, RTAX_MTU);
352 idev = __in6_dev_get(dst->dev);
354 mtu = idev->cnf.mtu6;
360 static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
365 /* ipv6 conntrack defrag sets max_frag_size + ignore_df */
366 if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)
372 if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)
378 int ip6_forward(struct sk_buff *skb)
380 struct dst_entry *dst = skb_dst(skb);
381 struct ipv6hdr *hdr = ipv6_hdr(skb);
382 struct inet6_skb_parm *opt = IP6CB(skb);
383 struct net *net = dev_net(dst->dev);
386 if (net->ipv6.devconf_all->forwarding == 0)
389 if (skb->pkt_type != PACKET_HOST)
392 if (unlikely(skb->sk))
395 if (skb_warn_if_lro(skb))
398 if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
399 IP6_INC_STATS_BH(net, ip6_dst_idev(dst),
400 IPSTATS_MIB_INDISCARDS);
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
419 if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
420 if (ip6_call_ra_chain(skb, ntohs(opt->ra)))
425 * check and decrement ttl
427 if (hdr->hop_limit <= 1) {
428 /* Force OUTPUT device used as source address */
430 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0);
431 IP6_INC_STATS_BH(net, ip6_dst_idev(dst),
432 IPSTATS_MIB_INHDRERRORS);
438 /* XXX: idev->cnf.proxy_ndp? */
439 if (net->ipv6.devconf_all->proxy_ndp &&
440 pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
441 int proxied = ip6_forward_proxy_check(skb);
443 return ip6_input(skb);
444 else if (proxied < 0) {
445 IP6_INC_STATS_BH(net, ip6_dst_idev(dst),
446 IPSTATS_MIB_INDISCARDS);
451 if (!xfrm6_route_forward(skb)) {
452 IP6_INC_STATS_BH(net, ip6_dst_idev(dst),
453 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 && opt->srcrt == 0 && !skb_sec_path(skb)) {
463 struct in6_addr *target = NULL;
464 struct inet_peer *peer;
468 * incoming and outgoing devices are the same
472 rt = (struct rt6_info *) dst;
473 if (rt->rt6i_flags & RTF_GATEWAY)
474 target = &rt->rt6i_gateway;
476 target = &hdr->daddr;
478 peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1);
480 /* Limit redirects both by destination (here)
481 and by source (inside ndisc_send_redirect)
483 if (inet_peer_xrlim_allow(peer, 1*HZ))
484 ndisc_send_redirect(skb, 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);
501 mtu = ip6_dst_mtu_forward(dst);
502 if (mtu < IPV6_MIN_MTU)
505 if (ip6_pkt_too_big(skb, mtu)) {
506 /* Again, force OUTPUT device used as source address */
508 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
509 IP6_INC_STATS_BH(net, ip6_dst_idev(dst),
510 IPSTATS_MIB_INTOOBIGERRORS);
511 IP6_INC_STATS_BH(net, ip6_dst_idev(dst),
512 IPSTATS_MIB_FRAGFAILS);
517 if (skb_cow(skb, dst->dev->hard_header_len)) {
518 IP6_INC_STATS_BH(net, ip6_dst_idev(dst),
519 IPSTATS_MIB_OUTDISCARDS);
525 /* Mangling hops number delayed to point after skb COW */
529 IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
530 IP6_ADD_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len);
531 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
532 net, NULL, skb, skb->dev, dst->dev,
536 IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS);
542 static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
544 to->pkt_type = from->pkt_type;
545 to->priority = from->priority;
546 to->protocol = from->protocol;
548 skb_dst_set(to, dst_clone(skb_dst(from)));
550 to->mark = from->mark;
552 #ifdef CONFIG_NET_SCHED
553 to->tc_index = from->tc_index;
556 skb_copy_secmark(to, from);
559 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
560 int (*output)(struct net *, struct sock *, struct sk_buff *))
562 struct sk_buff *frag;
563 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
564 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
565 inet6_sk(skb->sk) : NULL;
566 struct ipv6hdr *tmp_hdr;
568 unsigned int mtu, hlen, left, len;
571 int ptr, offset = 0, err = 0;
572 u8 *prevhdr, nexthdr = 0;
574 hlen = ip6_find_1stfragopt(skb, &prevhdr);
577 mtu = ip6_skb_dst_mtu(skb);
579 /* We must not fragment if the socket is set to force MTU discovery
580 * or if the skb it not generated by a local socket.
582 if (unlikely(!skb->ignore_df && skb->len > mtu))
585 if (IP6CB(skb)->frag_max_size) {
586 if (IP6CB(skb)->frag_max_size > mtu)
589 /* don't send fragments larger than what we received */
590 mtu = IP6CB(skb)->frag_max_size;
591 if (mtu < IPV6_MIN_MTU)
595 if (np && np->frag_size < mtu) {
599 if (mtu < hlen + sizeof(struct frag_hdr) + 8)
601 mtu -= hlen + sizeof(struct frag_hdr);
603 frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr,
604 &ipv6_hdr(skb)->saddr);
606 if (skb->ip_summed == CHECKSUM_PARTIAL &&
607 (err = skb_checksum_help(skb)))
610 hroom = LL_RESERVED_SPACE(rt->dst.dev);
611 if (skb_has_frag_list(skb)) {
612 int first_len = skb_pagelen(skb);
613 struct sk_buff *frag2;
615 if (first_len - hlen > mtu ||
616 ((first_len - hlen) & 7) ||
618 skb_headroom(skb) < (hroom + sizeof(struct frag_hdr)))
621 skb_walk_frags(skb, frag) {
622 /* Correct geometry. */
623 if (frag->len > mtu ||
624 ((frag->len & 7) && frag->next) ||
625 skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr)))
626 goto slow_path_clean;
628 /* Partially cloned skb? */
629 if (skb_shared(frag))
630 goto slow_path_clean;
635 frag->destructor = sock_wfree;
637 skb->truesize -= frag->truesize;
644 *prevhdr = NEXTHDR_FRAGMENT;
645 tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
647 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
648 IPSTATS_MIB_FRAGFAILS);
652 frag = skb_shinfo(skb)->frag_list;
653 skb_frag_list_init(skb);
655 __skb_pull(skb, hlen);
656 fh = (struct frag_hdr *)__skb_push(skb, sizeof(struct frag_hdr));
657 __skb_push(skb, hlen);
658 skb_reset_network_header(skb);
659 memcpy(skb_network_header(skb), tmp_hdr, hlen);
661 fh->nexthdr = nexthdr;
663 fh->frag_off = htons(IP6_MF);
664 fh->identification = frag_id;
666 first_len = skb_pagelen(skb);
667 skb->data_len = first_len - skb_headlen(skb);
668 skb->len = first_len;
669 ipv6_hdr(skb)->payload_len = htons(first_len -
670 sizeof(struct ipv6hdr));
675 /* Prepare header of the next frame,
676 * before previous one went down. */
678 frag->ip_summed = CHECKSUM_NONE;
679 skb_reset_transport_header(frag);
680 fh = (struct frag_hdr *)__skb_push(frag, sizeof(struct frag_hdr));
681 __skb_push(frag, hlen);
682 skb_reset_network_header(frag);
683 memcpy(skb_network_header(frag), tmp_hdr,
685 offset += skb->len - hlen - sizeof(struct frag_hdr);
686 fh->nexthdr = nexthdr;
688 fh->frag_off = htons(offset);
690 fh->frag_off |= htons(IP6_MF);
691 fh->identification = frag_id;
692 ipv6_hdr(frag)->payload_len =
694 sizeof(struct ipv6hdr));
695 ip6_copy_metadata(frag, skb);
698 err = output(net, sk, skb);
700 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
701 IPSTATS_MIB_FRAGCREATES);
714 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
715 IPSTATS_MIB_FRAGOKS);
720 kfree_skb_list(frag);
722 IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
723 IPSTATS_MIB_FRAGFAILS);
728 skb_walk_frags(skb, frag2) {
732 frag2->destructor = NULL;
733 skb->truesize += frag2->truesize;
738 left = skb->len - hlen; /* Space per frame */
739 ptr = hlen; /* Where to start from */
742 * Fragment the datagram.
745 *prevhdr = NEXTHDR_FRAGMENT;
746 troom = rt->dst.dev->needed_tailroom;
749 * Keep copying data until we run out.
753 /* IF: it doesn't fit, use 'mtu' - the data space left */
756 /* IF: we are not sending up to and including the packet end
757 then align the next start on an eight byte boundary */
762 /* Allocate buffer */
763 frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) +
764 hroom + troom, GFP_ATOMIC);
766 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
767 IPSTATS_MIB_FRAGFAILS);
773 * Set up data on packet
776 ip6_copy_metadata(frag, skb);
777 skb_reserve(frag, hroom);
778 skb_put(frag, len + hlen + sizeof(struct frag_hdr));
779 skb_reset_network_header(frag);
780 fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
781 frag->transport_header = (frag->network_header + hlen +
782 sizeof(struct frag_hdr));
785 * Charge the memory for the fragment to any owner
789 skb_set_owner_w(frag, skb->sk);
792 * Copy the packet header into the new buffer.
794 skb_copy_from_linear_data(skb, skb_network_header(frag), hlen);
797 * Build fragment header.
799 fh->nexthdr = nexthdr;
801 fh->identification = frag_id;
804 * Copy a block of the IP datagram.
806 BUG_ON(skb_copy_bits(skb, ptr, skb_transport_header(frag),
810 fh->frag_off = htons(offset);
812 fh->frag_off |= htons(IP6_MF);
813 ipv6_hdr(frag)->payload_len = htons(frag->len -
814 sizeof(struct ipv6hdr));
820 * Put this fragment into the sending queue.
822 err = output(net, sk, frag);
826 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
827 IPSTATS_MIB_FRAGCREATES);
829 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
830 IPSTATS_MIB_FRAGOKS);
835 if (skb->sk && dst_allfrag(skb_dst(skb)))
836 sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
838 skb->dev = skb_dst(skb)->dev;
839 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
843 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
844 IPSTATS_MIB_FRAGFAILS);
849 static inline int ip6_rt_check(const struct rt6key *rt_key,
850 const struct in6_addr *fl_addr,
851 const struct in6_addr *addr_cache)
853 return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&
854 (!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache));
857 static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
858 struct dst_entry *dst,
859 const struct flowi6 *fl6)
861 struct ipv6_pinfo *np = inet6_sk(sk);
867 if (dst->ops->family != AF_INET6) {
872 rt = (struct rt6_info *)dst;
873 /* Yes, checking route validity in not connected
874 * case is not very simple. Take into account,
875 * that we do not support routing by source, TOS,
876 * and MSG_DONTROUTE --ANK (980726)
878 * 1. ip6_rt_check(): If route was host route,
879 * check that cached destination is current.
880 * If it is network route, we still may
881 * check its validity using saved pointer
882 * to the last used address: daddr_cache.
883 * We do not want to save whole address now,
884 * (because main consumer of this service
885 * is tcp, which has not this problem),
886 * so that the last trick works only on connected
888 * 2. oif also should be the same.
890 if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) ||
891 #ifdef CONFIG_IPV6_SUBTREES
892 ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) ||
894 (!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) &&
895 (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) {
904 static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
905 struct dst_entry **dst, struct flowi6 *fl6)
907 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
914 /* The correct way to handle this would be to do
915 * ip6_route_get_saddr, and then ip6_route_output; however,
916 * the route-specific preferred source forces the
917 * ip6_route_output call _before_ ip6_route_get_saddr.
919 * In source specific routing (no src=any default route),
920 * ip6_route_output will fail given src=any saddr, though, so
921 * that's why we try it again later.
923 if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) {
925 bool had_dst = *dst != NULL;
928 *dst = ip6_route_output(net, sk, fl6);
929 rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
930 err = ip6_route_get_saddr(net, rt, &fl6->daddr,
931 sk ? inet6_sk(sk)->srcprefs : 0,
934 goto out_err_release;
936 /* If we had an erroneous initial result, pretend it
937 * never existed and let the SA-enabled version take
940 if (!had_dst && (*dst)->error) {
946 flags |= RT6_LOOKUP_F_IFACE;
950 *dst = ip6_route_output_flags(net, sk, fl6, flags);
954 goto out_err_release;
956 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
958 * Here if the dst entry we've looked up
959 * has a neighbour entry that is in the INCOMPLETE
960 * state and the src address from the flow is
961 * marked as OPTIMISTIC, we release the found
962 * dst entry and replace it instead with the
963 * dst entry of the nexthop router
965 rt = (struct rt6_info *) *dst;
967 n = __ipv6_neigh_lookup_noref(rt->dst.dev,
968 rt6_nexthop(rt, &fl6->daddr));
969 err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0;
970 rcu_read_unlock_bh();
973 struct inet6_ifaddr *ifp;
974 struct flowi6 fl_gw6;
977 ifp = ipv6_get_ifaddr(net, &fl6->saddr,
980 redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
986 * We need to get the dst entry for the
987 * default router instead
990 memcpy(&fl_gw6, fl6, sizeof(struct flowi6));
991 memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr));
992 *dst = ip6_route_output(net, sk, &fl_gw6);
995 goto out_err_release;
1003 if (err == -ENETUNREACH)
1004 IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES);
1011 * ip6_dst_lookup - perform route lookup on flow
1012 * @sk: socket which provides route info
1013 * @dst: pointer to dst_entry * for result
1014 * @fl6: flow to lookup
1016 * This function performs a route lookup on the given flow.
1018 * It returns zero on success, or a standard errno code on error.
1020 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1024 return ip6_dst_lookup_tail(net, sk, dst, fl6);
1026 EXPORT_SYMBOL_GPL(ip6_dst_lookup);
1029 * ip6_dst_lookup_flow - perform route lookup on flow with ipsec
1030 * @sk: socket which provides route info
1031 * @fl6: flow to lookup
1032 * @final_dst: final destination address for ipsec lookup
1034 * This function performs a route lookup on the given flow.
1036 * It returns a valid dst pointer on success, or a pointer encoded
1039 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
1040 const struct in6_addr *final_dst)
1042 struct dst_entry *dst = NULL;
1045 err = ip6_dst_lookup_tail(sock_net(sk), sk, &dst, fl6);
1047 return ERR_PTR(err);
1049 fl6->daddr = *final_dst;
1050 if (!fl6->flowi6_oif)
1051 fl6->flowi6_oif = l3mdev_fib_oif(dst->dev);
1053 return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
1055 EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
1058 * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow
1059 * @sk: socket which provides the dst cache and route info
1060 * @fl6: flow to lookup
1061 * @final_dst: final destination address for ipsec lookup
1063 * This function performs a route lookup on the given flow with the
1064 * possibility of using the cached route in the socket if it is valid.
1065 * It will take the socket dst lock when operating on the dst cache.
1066 * As a result, this function can only be used in process context.
1068 * It returns a valid dst pointer on success, or a pointer encoded
1071 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1072 const struct in6_addr *final_dst)
1074 struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
1076 dst = ip6_sk_dst_check(sk, dst, fl6);
1078 dst = ip6_dst_lookup_flow(sk, fl6, final_dst);
1082 EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
1084 static inline int ip6_ufo_append_data(struct sock *sk,
1085 struct sk_buff_head *queue,
1086 int getfrag(void *from, char *to, int offset, int len,
1087 int odd, struct sk_buff *skb),
1088 void *from, int length, int hh_len, int fragheaderlen,
1089 int exthdrlen, int transhdrlen, int mtu,
1090 unsigned int flags, const struct flowi6 *fl6)
1093 struct sk_buff *skb;
1096 /* There is support for UDP large send offload by network
1097 * device, so create one single skb packet containing complete
1100 skb = skb_peek_tail(queue);
1102 skb = sock_alloc_send_skb(sk,
1103 hh_len + fragheaderlen + transhdrlen + 20,
1104 (flags & MSG_DONTWAIT), &err);
1108 /* reserve space for Hardware header */
1109 skb_reserve(skb, hh_len);
1111 /* create space for UDP/IP header */
1112 skb_put(skb, fragheaderlen + transhdrlen);
1114 /* initialize network header pointer */
1115 skb_set_network_header(skb, exthdrlen);
1117 /* initialize protocol header pointer */
1118 skb->transport_header = skb->network_header + fragheaderlen;
1120 skb->protocol = htons(ETH_P_IPV6);
1123 __skb_queue_tail(queue, skb);
1124 } else if (skb_is_gso(skb)) {
1128 skb->ip_summed = CHECKSUM_PARTIAL;
1129 /* Specify the length of each IPv6 datagram fragment.
1130 * It has to be a multiple of 8.
1132 skb_shinfo(skb)->gso_size = (mtu - fragheaderlen -
1133 sizeof(struct frag_hdr)) & ~7;
1134 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
1135 skb_shinfo(skb)->ip6_frag_id = ipv6_select_ident(sock_net(sk),
1140 return skb_append_datato_frags(sk, skb, getfrag, from,
1141 (length - transhdrlen));
1144 static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
1147 return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
1150 static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
1153 return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
1156 static void ip6_append_data_mtu(unsigned int *mtu,
1158 unsigned int fragheaderlen,
1159 struct sk_buff *skb,
1160 struct rt6_info *rt,
1161 unsigned int orig_mtu)
1163 if (!(rt->dst.flags & DST_XFRM_TUNNEL)) {
1165 /* first fragment, reserve header_len */
1166 *mtu = orig_mtu - rt->dst.header_len;
1170 * this fragment is not first, the headers
1171 * space is regarded as data space.
1175 *maxfraglen = ((*mtu - fragheaderlen) & ~7)
1176 + fragheaderlen - sizeof(struct frag_hdr);
1180 static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
1181 struct inet6_cork *v6_cork,
1182 int hlimit, int tclass, struct ipv6_txoptions *opt,
1183 struct rt6_info *rt, struct flowi6 *fl6)
1185 struct ipv6_pinfo *np = inet6_sk(sk);
1192 if (WARN_ON(v6_cork->opt))
1195 v6_cork->opt = kzalloc(opt->tot_len, sk->sk_allocation);
1196 if (unlikely(!v6_cork->opt))
1199 v6_cork->opt->tot_len = opt->tot_len;
1200 v6_cork->opt->opt_flen = opt->opt_flen;
1201 v6_cork->opt->opt_nflen = opt->opt_nflen;
1203 v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt,
1205 if (opt->dst0opt && !v6_cork->opt->dst0opt)
1208 v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt,
1210 if (opt->dst1opt && !v6_cork->opt->dst1opt)
1213 v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt,
1215 if (opt->hopopt && !v6_cork->opt->hopopt)
1218 v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt,
1220 if (opt->srcrt && !v6_cork->opt->srcrt)
1223 /* need source address above miyazawa*/
1226 cork->base.dst = &rt->dst;
1227 cork->fl.u.ip6 = *fl6;
1228 v6_cork->hop_limit = hlimit;
1229 v6_cork->tclass = tclass;
1230 if (rt->dst.flags & DST_XFRM_TUNNEL)
1231 mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
1232 rt->dst.dev->mtu : dst_mtu(&rt->dst);
1234 mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
1235 rt->dst.dev->mtu : dst_mtu(rt->dst.path);
1236 if (np->frag_size < mtu) {
1238 mtu = np->frag_size;
1240 cork->base.fragsize = mtu;
1241 if (dst_allfrag(rt->dst.path))
1242 cork->base.flags |= IPCORK_ALLFRAG;
1243 cork->base.length = 0;
1248 static int __ip6_append_data(struct sock *sk,
1250 struct sk_buff_head *queue,
1251 struct inet_cork *cork,
1252 struct inet6_cork *v6_cork,
1253 struct page_frag *pfrag,
1254 int getfrag(void *from, char *to, int offset,
1255 int len, int odd, struct sk_buff *skb),
1256 void *from, int length, int transhdrlen,
1257 unsigned int flags, int dontfrag)
1259 struct sk_buff *skb, *skb_prev = NULL;
1260 unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu;
1262 int dst_exthdrlen = 0;
1269 struct rt6_info *rt = (struct rt6_info *)cork->dst;
1270 struct ipv6_txoptions *opt = v6_cork->opt;
1271 int csummode = CHECKSUM_NONE;
1272 unsigned int maxnonfragsize, headersize;
1274 skb = skb_peek_tail(queue);
1276 exthdrlen = opt ? opt->opt_flen : 0;
1277 dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
1280 mtu = cork->fragsize;
1283 hh_len = LL_RESERVED_SPACE(rt->dst.dev);
1285 fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
1286 (opt ? opt->opt_nflen : 0);
1287 maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -
1288 sizeof(struct frag_hdr);
1290 headersize = sizeof(struct ipv6hdr) +
1291 (opt ? opt->opt_flen + opt->opt_nflen : 0) +
1292 (dst_allfrag(&rt->dst) ?
1293 sizeof(struct frag_hdr) : 0) +
1294 rt->rt6i_nfheader_len;
1296 if (cork->length + length > mtu - headersize && dontfrag &&
1297 (sk->sk_protocol == IPPROTO_UDP ||
1298 sk->sk_protocol == IPPROTO_RAW)) {
1299 ipv6_local_rxpmtu(sk, fl6, mtu - headersize +
1300 sizeof(struct ipv6hdr));
1304 if (ip6_sk_ignore_df(sk))
1305 maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN;
1307 maxnonfragsize = mtu;
1309 if (cork->length + length > maxnonfragsize - headersize) {
1311 ipv6_local_error(sk, EMSGSIZE, fl6,
1313 sizeof(struct ipv6hdr));
1317 /* CHECKSUM_PARTIAL only with no extension headers and when
1318 * we are not going to fragment
1320 if (transhdrlen && sk->sk_protocol == IPPROTO_UDP &&
1321 headersize == sizeof(struct ipv6hdr) &&
1322 length < mtu - headersize &&
1323 !(flags & MSG_MORE) &&
1324 rt->dst.dev->features & NETIF_F_V6_CSUM)
1325 csummode = CHECKSUM_PARTIAL;
1327 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_RAW) {
1328 sock_tx_timestamp(sk, &tx_flags);
1329 if (tx_flags & SKBTX_ANY_SW_TSTAMP &&
1330 sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)
1331 tskey = sk->sk_tskey++;
1335 * Let's try using as much space as possible.
1336 * Use MTU if total length of the message fits into the MTU.
1337 * Otherwise, we need to reserve fragment header and
1338 * fragment alignment (= 8-15 octects, in total).
1340 * Note that we may need to "move" the data from the tail of
1341 * of the buffer to the new fragment when we split
1344 * FIXME: It may be fragmented into multiple chunks
1345 * at once if non-fragmentable extension headers
1350 cork->length += length;
1351 if (((length > mtu) ||
1352 (skb && skb_is_gso(skb))) &&
1353 (sk->sk_protocol == IPPROTO_UDP) &&
1354 (rt->dst.dev->features & NETIF_F_UFO) &&
1355 (sk->sk_type == SOCK_DGRAM) && !udp_get_no_check6_tx(sk)) {
1356 err = ip6_ufo_append_data(sk, queue, getfrag, from, length,
1357 hh_len, fragheaderlen, exthdrlen,
1358 transhdrlen, mtu, flags, fl6);
1367 while (length > 0) {
1368 /* Check if the remaining data fits into current packet. */
1369 copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
1371 copy = maxfraglen - skb->len;
1375 unsigned int datalen;
1376 unsigned int fraglen;
1377 unsigned int fraggap;
1378 unsigned int alloclen;
1380 /* There's no room in the current skb */
1382 fraggap = skb->len - maxfraglen;
1385 /* update mtu and maxfraglen if necessary */
1386 if (!skb || !skb_prev)
1387 ip6_append_data_mtu(&mtu, &maxfraglen,
1388 fragheaderlen, skb, rt,
1394 * If remaining data exceeds the mtu,
1395 * we know we need more fragment(s).
1397 datalen = length + fraggap;
1399 if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
1400 datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len;
1401 if ((flags & MSG_MORE) &&
1402 !(rt->dst.dev->features&NETIF_F_SG))
1405 alloclen = datalen + fragheaderlen;
1407 alloclen += dst_exthdrlen;
1409 if (datalen != length + fraggap) {
1411 * this is not the last fragment, the trailer
1412 * space is regarded as data space.
1414 datalen += rt->dst.trailer_len;
1417 alloclen += rt->dst.trailer_len;
1418 fraglen = datalen + fragheaderlen;
1421 * We just reserve space for fragment header.
1422 * Note: this may be overallocation if the message
1423 * (without MSG_MORE) fits into the MTU.
1425 alloclen += sizeof(struct frag_hdr);
1428 skb = sock_alloc_send_skb(sk,
1430 (flags & MSG_DONTWAIT), &err);
1433 if (atomic_read(&sk->sk_wmem_alloc) <=
1435 skb = sock_wmalloc(sk,
1436 alloclen + hh_len, 1,
1444 * Fill in the control structures
1446 skb->protocol = htons(ETH_P_IPV6);
1447 skb->ip_summed = csummode;
1449 /* reserve for fragmentation and ipsec header */
1450 skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
1453 /* Only the initial fragment is time stamped */
1454 skb_shinfo(skb)->tx_flags = tx_flags;
1456 skb_shinfo(skb)->tskey = tskey;
1460 * Find where to start putting bytes
1462 data = skb_put(skb, fraglen);
1463 skb_set_network_header(skb, exthdrlen);
1464 data += fragheaderlen;
1465 skb->transport_header = (skb->network_header +
1468 skb->csum = skb_copy_and_csum_bits(
1469 skb_prev, maxfraglen,
1470 data + transhdrlen, fraggap, 0);
1471 skb_prev->csum = csum_sub(skb_prev->csum,
1474 pskb_trim_unique(skb_prev, maxfraglen);
1476 copy = datalen - transhdrlen - fraggap;
1482 } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) {
1489 length -= datalen - fraggap;
1495 * Put the packet on the pending queue
1497 __skb_queue_tail(queue, skb);
1504 if (!(rt->dst.dev->features&NETIF_F_SG)) {
1508 if (getfrag(from, skb_put(skb, copy),
1509 offset, copy, off, skb) < 0) {
1510 __skb_trim(skb, off);
1515 int i = skb_shinfo(skb)->nr_frags;
1518 if (!sk_page_frag_refill(sk, pfrag))
1521 if (!skb_can_coalesce(skb, i, pfrag->page,
1524 if (i == MAX_SKB_FRAGS)
1527 __skb_fill_page_desc(skb, i, pfrag->page,
1529 skb_shinfo(skb)->nr_frags = ++i;
1530 get_page(pfrag->page);
1532 copy = min_t(int, copy, pfrag->size - pfrag->offset);
1534 page_address(pfrag->page) + pfrag->offset,
1535 offset, copy, skb->len, skb) < 0)
1538 pfrag->offset += copy;
1539 skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
1541 skb->data_len += copy;
1542 skb->truesize += copy;
1543 atomic_add(copy, &sk->sk_wmem_alloc);
1554 cork->length -= length;
1555 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
1559 int ip6_append_data(struct sock *sk,
1560 int getfrag(void *from, char *to, int offset, int len,
1561 int odd, struct sk_buff *skb),
1562 void *from, int length, int transhdrlen, int hlimit,
1563 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
1564 struct rt6_info *rt, unsigned int flags, int dontfrag)
1566 struct inet_sock *inet = inet_sk(sk);
1567 struct ipv6_pinfo *np = inet6_sk(sk);
1571 if (flags&MSG_PROBE)
1573 if (skb_queue_empty(&sk->sk_write_queue)) {
1577 err = ip6_setup_cork(sk, &inet->cork, &np->cork, hlimit,
1578 tclass, opt, rt, fl6);
1582 exthdrlen = (opt ? opt->opt_flen : 0);
1583 length += exthdrlen;
1584 transhdrlen += exthdrlen;
1586 fl6 = &inet->cork.fl.u.ip6;
1590 return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base,
1591 &np->cork, sk_page_frag(sk), getfrag,
1592 from, length, transhdrlen, flags, dontfrag);
1594 EXPORT_SYMBOL_GPL(ip6_append_data);
1596 static void ip6_cork_release(struct inet_cork_full *cork,
1597 struct inet6_cork *v6_cork)
1600 kfree(v6_cork->opt->dst0opt);
1601 kfree(v6_cork->opt->dst1opt);
1602 kfree(v6_cork->opt->hopopt);
1603 kfree(v6_cork->opt->srcrt);
1604 kfree(v6_cork->opt);
1605 v6_cork->opt = NULL;
1608 if (cork->base.dst) {
1609 dst_release(cork->base.dst);
1610 cork->base.dst = NULL;
1611 cork->base.flags &= ~IPCORK_ALLFRAG;
1613 memset(&cork->fl, 0, sizeof(cork->fl));
1616 struct sk_buff *__ip6_make_skb(struct sock *sk,
1617 struct sk_buff_head *queue,
1618 struct inet_cork_full *cork,
1619 struct inet6_cork *v6_cork)
1621 struct sk_buff *skb, *tmp_skb;
1622 struct sk_buff **tail_skb;
1623 struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
1624 struct ipv6_pinfo *np = inet6_sk(sk);
1625 struct net *net = sock_net(sk);
1626 struct ipv6hdr *hdr;
1627 struct ipv6_txoptions *opt = v6_cork->opt;
1628 struct rt6_info *rt = (struct rt6_info *)cork->base.dst;
1629 struct flowi6 *fl6 = &cork->fl.u.ip6;
1630 unsigned char proto = fl6->flowi6_proto;
1632 skb = __skb_dequeue(queue);
1635 tail_skb = &(skb_shinfo(skb)->frag_list);
1637 /* move skb->data to ip header from ext header */
1638 if (skb->data < skb_network_header(skb))
1639 __skb_pull(skb, skb_network_offset(skb));
1640 while ((tmp_skb = __skb_dequeue(queue)) != NULL) {
1641 __skb_pull(tmp_skb, skb_network_header_len(skb));
1642 *tail_skb = tmp_skb;
1643 tail_skb = &(tmp_skb->next);
1644 skb->len += tmp_skb->len;
1645 skb->data_len += tmp_skb->len;
1646 skb->truesize += tmp_skb->truesize;
1647 tmp_skb->destructor = NULL;
1651 /* Allow local fragmentation. */
1652 skb->ignore_df = ip6_sk_ignore_df(sk);
1654 *final_dst = fl6->daddr;
1655 __skb_pull(skb, skb_network_header_len(skb));
1656 if (opt && opt->opt_flen)
1657 ipv6_push_frag_opts(skb, opt, &proto);
1658 if (opt && opt->opt_nflen)
1659 ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);
1661 skb_push(skb, sizeof(struct ipv6hdr));
1662 skb_reset_network_header(skb);
1663 hdr = ipv6_hdr(skb);
1665 ip6_flow_hdr(hdr, v6_cork->tclass,
1666 ip6_make_flowlabel(net, skb, fl6->flowlabel,
1667 np->autoflowlabel, fl6));
1668 hdr->hop_limit = v6_cork->hop_limit;
1669 hdr->nexthdr = proto;
1670 hdr->saddr = fl6->saddr;
1671 hdr->daddr = *final_dst;
1673 skb->priority = sk->sk_priority;
1674 skb->mark = sk->sk_mark;
1676 skb_dst_set(skb, dst_clone(&rt->dst));
1677 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
1678 if (proto == IPPROTO_ICMPV6) {
1679 struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
1681 ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type);
1682 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1685 ip6_cork_release(cork, v6_cork);
1690 int ip6_send_skb(struct sk_buff *skb)
1692 struct net *net = sock_net(skb->sk);
1693 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
1696 err = ip6_local_out(net, skb->sk, skb);
1699 err = net_xmit_errno(err);
1701 IP6_INC_STATS(net, rt->rt6i_idev,
1702 IPSTATS_MIB_OUTDISCARDS);
1708 int ip6_push_pending_frames(struct sock *sk)
1710 struct sk_buff *skb;
1712 skb = ip6_finish_skb(sk);
1716 return ip6_send_skb(skb);
1718 EXPORT_SYMBOL_GPL(ip6_push_pending_frames);
1720 static void __ip6_flush_pending_frames(struct sock *sk,
1721 struct sk_buff_head *queue,
1722 struct inet_cork_full *cork,
1723 struct inet6_cork *v6_cork)
1725 struct sk_buff *skb;
1727 while ((skb = __skb_dequeue_tail(queue)) != NULL) {
1729 IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
1730 IPSTATS_MIB_OUTDISCARDS);
1734 ip6_cork_release(cork, v6_cork);
1737 void ip6_flush_pending_frames(struct sock *sk)
1739 __ip6_flush_pending_frames(sk, &sk->sk_write_queue,
1740 &inet_sk(sk)->cork, &inet6_sk(sk)->cork);
1742 EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);
1744 struct sk_buff *ip6_make_skb(struct sock *sk,
1745 int getfrag(void *from, char *to, int offset,
1746 int len, int odd, struct sk_buff *skb),
1747 void *from, int length, int transhdrlen,
1748 int hlimit, int tclass,
1749 struct ipv6_txoptions *opt, struct flowi6 *fl6,
1750 struct rt6_info *rt, unsigned int flags,
1753 struct inet_cork_full cork;
1754 struct inet6_cork v6_cork;
1755 struct sk_buff_head queue;
1756 int exthdrlen = (opt ? opt->opt_flen : 0);
1759 if (flags & MSG_PROBE)
1762 __skb_queue_head_init(&queue);
1764 cork.base.flags = 0;
1766 cork.base.opt = NULL;
1768 err = ip6_setup_cork(sk, &cork, &v6_cork, hlimit, tclass, opt, rt, fl6);
1770 return ERR_PTR(err);
1773 dontfrag = inet6_sk(sk)->dontfrag;
1775 err = __ip6_append_data(sk, fl6, &queue, &cork.base, &v6_cork,
1776 ¤t->task_frag, getfrag, from,
1777 length + exthdrlen, transhdrlen + exthdrlen,
1780 __ip6_flush_pending_frames(sk, &queue, &cork, &v6_cork);
1781 return ERR_PTR(err);
1784 return __ip6_make_skb(sk, &queue, &cork, &v6_cork);