2 * IPv6 output functions
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/net/ipv4/ip_output.c
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 * A.N.Kuznetsov : airthmetics in fragmentation.
17 * extension headers are implemented.
18 * route changes now work.
19 * ip6_forward does not confuse sniffers.
22 * H. von Brand : Added missing #include <linux/string.h>
23 * Imran Patel : frag id should be in NBO
24 * Kazunori MIYAZAWA @USAGI
25 * : add ip6_append_data and related functions
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/string.h>
32 #include <linux/socket.h>
33 #include <linux/net.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/in6.h>
37 #include <linux/tcp.h>
38 #include <linux/route.h>
39 #include <linux/module.h>
40 #include <linux/slab.h>
42 #include <linux/netfilter.h>
43 #include <linux/netfilter_ipv6.h>
49 #include <net/ndisc.h>
50 #include <net/protocol.h>
51 #include <net/ip6_route.h>
52 #include <net/addrconf.h>
53 #include <net/rawv6.h>
56 #include <net/checksum.h>
57 #include <linux/mroute6.h>
59 static int ip6_finish_output2(struct sk_buff
*skb
)
61 struct dst_entry
*dst
= skb_dst(skb
);
62 struct net_device
*dev
= dst
->dev
;
63 struct neighbour
*neigh
;
64 struct in6_addr
*nexthop
;
67 skb
->protocol
= htons(ETH_P_IPV6
);
70 if (ipv6_addr_is_multicast(&ipv6_hdr(skb
)->daddr
)) {
71 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
73 if (!(dev
->flags
& IFF_LOOPBACK
) && sk_mc_loop(skb
->sk
) &&
74 ((mroute6_socket(dev_net(dev
), skb
) &&
75 !(IP6CB(skb
)->flags
& IP6SKB_FORWARDED
)) ||
76 ipv6_chk_mcast_addr(dev
, &ipv6_hdr(skb
)->daddr
,
77 &ipv6_hdr(skb
)->saddr
))) {
78 struct sk_buff
*newskb
= skb_clone(skb
, GFP_ATOMIC
);
80 /* Do not check for IFF_ALLMULTI; multicast routing
81 is not supported in any case.
84 NF_HOOK(NFPROTO_IPV6
, NF_INET_POST_ROUTING
,
85 newskb
, NULL
, newskb
->dev
,
88 if (ipv6_hdr(skb
)->hop_limit
== 0) {
89 IP6_INC_STATS(dev_net(dev
), idev
,
90 IPSTATS_MIB_OUTDISCARDS
);
96 IP6_UPD_PO_STATS(dev_net(dev
), idev
, IPSTATS_MIB_OUTMCAST
,
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
);
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(dev_net(dst
->dev
),
120 ip6_dst_idev(dst
), IPSTATS_MIB_OUTNOROUTES
);
125 static int ip6_finish_output(struct sk_buff
*skb
)
127 if ((skb
->len
> ip6_skb_dst_mtu(skb
) && !skb_is_gso(skb
)) ||
128 dst_allfrag(skb_dst(skb
)) ||
129 (IP6CB(skb
)->frag_max_size
&& skb
->len
> IP6CB(skb
)->frag_max_size
))
130 return ip6_fragment(skb
, ip6_finish_output2
);
132 return ip6_finish_output2(skb
);
135 int ip6_output(struct sock
*sk
, struct sk_buff
*skb
)
137 struct net_device
*dev
= skb_dst(skb
)->dev
;
138 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
139 if (unlikely(idev
->cnf
.disable_ipv6
)) {
140 IP6_INC_STATS(dev_net(dev
), idev
,
141 IPSTATS_MIB_OUTDISCARDS
);
146 return NF_HOOK_COND(NFPROTO_IPV6
, NF_INET_POST_ROUTING
, skb
, NULL
, dev
,
148 !(IP6CB(skb
)->flags
& IP6SKB_REROUTED
));
152 * xmit an sk_buff (used by TCP, SCTP and DCCP)
155 int ip6_xmit(struct sock
*sk
, struct sk_buff
*skb
, struct flowi6
*fl6
,
156 struct ipv6_txoptions
*opt
, int tclass
)
158 struct net
*net
= sock_net(sk
);
159 struct ipv6_pinfo
*np
= inet6_sk(sk
);
160 struct in6_addr
*first_hop
= &fl6
->daddr
;
161 struct dst_entry
*dst
= skb_dst(skb
);
163 u8 proto
= fl6
->flowi6_proto
;
164 int seg_len
= skb
->len
;
169 unsigned int head_room
;
171 /* First: exthdrs may take lots of space (~8K for now)
172 MAX_HEADER is not enough.
174 head_room
= opt
->opt_nflen
+ opt
->opt_flen
;
175 seg_len
+= head_room
;
176 head_room
+= sizeof(struct ipv6hdr
) + LL_RESERVED_SPACE(dst
->dev
);
178 if (skb_headroom(skb
) < head_room
) {
179 struct sk_buff
*skb2
= skb_realloc_headroom(skb
, head_room
);
181 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
182 IPSTATS_MIB_OUTDISCARDS
);
188 skb_set_owner_w(skb
, sk
);
191 ipv6_push_frag_opts(skb
, opt
, &proto
);
193 ipv6_push_nfrag_opts(skb
, opt
, &proto
, &first_hop
);
196 skb_push(skb
, sizeof(struct ipv6hdr
));
197 skb_reset_network_header(skb
);
201 * Fill in the IPv6 header
204 hlimit
= np
->hop_limit
;
206 hlimit
= ip6_dst_hoplimit(dst
);
208 ip6_flow_hdr(hdr
, tclass
, ip6_make_flowlabel(net
, skb
, fl6
->flowlabel
,
211 hdr
->payload_len
= htons(seg_len
);
212 hdr
->nexthdr
= proto
;
213 hdr
->hop_limit
= hlimit
;
215 hdr
->saddr
= fl6
->saddr
;
216 hdr
->daddr
= *first_hop
;
218 skb
->protocol
= htons(ETH_P_IPV6
);
219 skb
->priority
= sk
->sk_priority
;
220 skb
->mark
= sk
->sk_mark
;
223 if ((skb
->len
<= mtu
) || skb
->ignore_df
|| skb_is_gso(skb
)) {
224 IP6_UPD_PO_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
225 IPSTATS_MIB_OUT
, skb
->len
);
226 return NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, skb
, NULL
,
227 dst
->dev
, dst_output
);
231 ipv6_local_error(sk
, EMSGSIZE
, fl6
, mtu
);
232 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_FRAGFAILS
);
236 EXPORT_SYMBOL(ip6_xmit
);
238 static int ip6_call_ra_chain(struct sk_buff
*skb
, int sel
)
240 struct ip6_ra_chain
*ra
;
241 struct sock
*last
= NULL
;
243 read_lock(&ip6_ra_lock
);
244 for (ra
= ip6_ra_chain
; ra
; ra
= ra
->next
) {
245 struct sock
*sk
= ra
->sk
;
246 if (sk
&& ra
->sel
== sel
&&
247 (!sk
->sk_bound_dev_if
||
248 sk
->sk_bound_dev_if
== skb
->dev
->ifindex
)) {
250 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
252 rawv6_rcv(last
, skb2
);
259 rawv6_rcv(last
, skb
);
260 read_unlock(&ip6_ra_lock
);
263 read_unlock(&ip6_ra_lock
);
267 static int ip6_forward_proxy_check(struct sk_buff
*skb
)
269 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
270 u8 nexthdr
= hdr
->nexthdr
;
274 if (ipv6_ext_hdr(nexthdr
)) {
275 offset
= ipv6_skip_exthdr(skb
, sizeof(*hdr
), &nexthdr
, &frag_off
);
279 offset
= sizeof(struct ipv6hdr
);
281 if (nexthdr
== IPPROTO_ICMPV6
) {
282 struct icmp6hdr
*icmp6
;
284 if (!pskb_may_pull(skb
, (skb_network_header(skb
) +
285 offset
+ 1 - skb
->data
)))
288 icmp6
= (struct icmp6hdr
*)(skb_network_header(skb
) + offset
);
290 switch (icmp6
->icmp6_type
) {
291 case NDISC_ROUTER_SOLICITATION
:
292 case NDISC_ROUTER_ADVERTISEMENT
:
293 case NDISC_NEIGHBOUR_SOLICITATION
:
294 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
296 /* For reaction involving unicast neighbor discovery
297 * message destined to the proxied address, pass it to
307 * The proxying router can't forward traffic sent to a link-local
308 * address, so signal the sender and discard the packet. This
309 * behavior is clarified by the MIPv6 specification.
311 if (ipv6_addr_type(&hdr
->daddr
) & IPV6_ADDR_LINKLOCAL
) {
312 dst_link_failure(skb
);
319 static inline int ip6_forward_finish(struct sk_buff
*skb
)
321 return dst_output(skb
);
324 static unsigned int ip6_dst_mtu_forward(const struct dst_entry
*dst
)
327 struct inet6_dev
*idev
;
329 if (dst_metric_locked(dst
, RTAX_MTU
)) {
330 mtu
= dst_metric_raw(dst
, RTAX_MTU
);
337 idev
= __in6_dev_get(dst
->dev
);
339 mtu
= idev
->cnf
.mtu6
;
345 static bool ip6_pkt_too_big(const struct sk_buff
*skb
, unsigned int mtu
)
350 /* ipv6 conntrack defrag sets max_frag_size + ignore_df */
351 if (IP6CB(skb
)->frag_max_size
&& IP6CB(skb
)->frag_max_size
> mtu
)
357 if (skb_is_gso(skb
) && skb_gso_network_seglen(skb
) <= mtu
)
363 int ip6_forward(struct sk_buff
*skb
)
365 struct dst_entry
*dst
= skb_dst(skb
);
366 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
367 struct inet6_skb_parm
*opt
= IP6CB(skb
);
368 struct net
*net
= dev_net(dst
->dev
);
371 if (net
->ipv6
.devconf_all
->forwarding
== 0)
374 if (skb
->pkt_type
!= PACKET_HOST
)
377 if (skb_warn_if_lro(skb
))
380 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_FWD
, skb
)) {
381 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
382 IPSTATS_MIB_INDISCARDS
);
386 skb_forward_csum(skb
);
389 * We DO NOT make any processing on
390 * RA packets, pushing them to user level AS IS
391 * without ane WARRANTY that application will be able
392 * to interpret them. The reason is that we
393 * cannot make anything clever here.
395 * We are not end-node, so that if packet contains
396 * AH/ESP, we cannot make anything.
397 * Defragmentation also would be mistake, RA packets
398 * cannot be fragmented, because there is no warranty
399 * that different fragments will go along one path. --ANK
401 if (unlikely(opt
->flags
& IP6SKB_ROUTERALERT
)) {
402 if (ip6_call_ra_chain(skb
, ntohs(opt
->ra
)))
407 * check and decrement ttl
409 if (hdr
->hop_limit
<= 1) {
410 /* Force OUTPUT device used as source address */
412 icmpv6_send(skb
, ICMPV6_TIME_EXCEED
, ICMPV6_EXC_HOPLIMIT
, 0);
413 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
414 IPSTATS_MIB_INHDRERRORS
);
420 /* XXX: idev->cnf.proxy_ndp? */
421 if (net
->ipv6
.devconf_all
->proxy_ndp
&&
422 pneigh_lookup(&nd_tbl
, net
, &hdr
->daddr
, skb
->dev
, 0)) {
423 int proxied
= ip6_forward_proxy_check(skb
);
425 return ip6_input(skb
);
426 else if (proxied
< 0) {
427 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
428 IPSTATS_MIB_INDISCARDS
);
433 if (!xfrm6_route_forward(skb
)) {
434 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
435 IPSTATS_MIB_INDISCARDS
);
440 /* IPv6 specs say nothing about it, but it is clear that we cannot
441 send redirects to source routed frames.
442 We don't send redirects to frames decapsulated from IPsec.
444 if (skb
->dev
== dst
->dev
&& opt
->srcrt
== 0 && !skb_sec_path(skb
)) {
445 struct in6_addr
*target
= NULL
;
446 struct inet_peer
*peer
;
450 * incoming and outgoing devices are the same
454 rt
= (struct rt6_info
*) dst
;
455 if (rt
->rt6i_flags
& RTF_GATEWAY
)
456 target
= &rt
->rt6i_gateway
;
458 target
= &hdr
->daddr
;
460 peer
= inet_getpeer_v6(net
->ipv6
.peers
, &rt
->rt6i_dst
.addr
, 1);
462 /* Limit redirects both by destination (here)
463 and by source (inside ndisc_send_redirect)
465 if (inet_peer_xrlim_allow(peer
, 1*HZ
))
466 ndisc_send_redirect(skb
, target
);
470 int addrtype
= ipv6_addr_type(&hdr
->saddr
);
472 /* This check is security critical. */
473 if (addrtype
== IPV6_ADDR_ANY
||
474 addrtype
& (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LOOPBACK
))
476 if (addrtype
& IPV6_ADDR_LINKLOCAL
) {
477 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
,
478 ICMPV6_NOT_NEIGHBOUR
, 0);
483 mtu
= ip6_dst_mtu_forward(dst
);
484 if (mtu
< IPV6_MIN_MTU
)
487 if (ip6_pkt_too_big(skb
, mtu
)) {
488 /* Again, force OUTPUT device used as source address */
490 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
491 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
492 IPSTATS_MIB_INTOOBIGERRORS
);
493 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
494 IPSTATS_MIB_FRAGFAILS
);
499 if (skb_cow(skb
, dst
->dev
->hard_header_len
)) {
500 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
501 IPSTATS_MIB_OUTDISCARDS
);
507 /* Mangling hops number delayed to point after skb COW */
511 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
), IPSTATS_MIB_OUTFORWDATAGRAMS
);
512 IP6_ADD_STATS_BH(net
, ip6_dst_idev(dst
), IPSTATS_MIB_OUTOCTETS
, skb
->len
);
513 return NF_HOOK(NFPROTO_IPV6
, NF_INET_FORWARD
, skb
, skb
->dev
, dst
->dev
,
517 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
), IPSTATS_MIB_INADDRERRORS
);
523 static void ip6_copy_metadata(struct sk_buff
*to
, struct sk_buff
*from
)
525 to
->pkt_type
= from
->pkt_type
;
526 to
->priority
= from
->priority
;
527 to
->protocol
= from
->protocol
;
529 skb_dst_set(to
, dst_clone(skb_dst(from
)));
531 to
->mark
= from
->mark
;
533 #ifdef CONFIG_NET_SCHED
534 to
->tc_index
= from
->tc_index
;
537 skb_copy_secmark(to
, from
);
540 static void ipv6_select_ident(struct frag_hdr
*fhdr
, struct rt6_info
*rt
)
542 static u32 ip6_idents_hashrnd __read_mostly
;
545 net_get_random_once(&ip6_idents_hashrnd
, sizeof(ip6_idents_hashrnd
));
547 hash
= __ipv6_addr_jhash(&rt
->rt6i_dst
.addr
, ip6_idents_hashrnd
);
548 hash
= __ipv6_addr_jhash(&rt
->rt6i_src
.addr
, hash
);
550 id
= ip_idents_reserve(hash
, 1);
551 fhdr
->identification
= htonl(id
);
554 int ip6_fragment(struct sk_buff
*skb
, int (*output
)(struct sk_buff
*))
556 struct sk_buff
*frag
;
557 struct rt6_info
*rt
= (struct rt6_info
*)skb_dst(skb
);
558 struct ipv6_pinfo
*np
= skb
->sk
? inet6_sk(skb
->sk
) : NULL
;
559 struct ipv6hdr
*tmp_hdr
;
561 unsigned int mtu
, hlen
, left
, len
;
564 int ptr
, offset
= 0, err
= 0;
565 u8
*prevhdr
, nexthdr
= 0;
566 struct net
*net
= dev_net(skb_dst(skb
)->dev
);
568 hlen
= ip6_find_1stfragopt(skb
, &prevhdr
);
571 mtu
= ip6_skb_dst_mtu(skb
);
573 /* We must not fragment if the socket is set to force MTU discovery
574 * or if the skb it not generated by a local socket.
576 if (unlikely(!skb
->ignore_df
&& skb
->len
> mtu
) ||
577 (IP6CB(skb
)->frag_max_size
&&
578 IP6CB(skb
)->frag_max_size
> mtu
)) {
579 if (skb
->sk
&& dst_allfrag(skb_dst(skb
)))
580 sk_nocaps_add(skb
->sk
, NETIF_F_GSO_MASK
);
582 skb
->dev
= skb_dst(skb
)->dev
;
583 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
584 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
585 IPSTATS_MIB_FRAGFAILS
);
590 if (np
&& np
->frag_size
< mtu
) {
594 mtu
-= hlen
+ sizeof(struct frag_hdr
);
596 if (skb_has_frag_list(skb
)) {
597 int first_len
= skb_pagelen(skb
);
598 struct sk_buff
*frag2
;
600 if (first_len
- hlen
> mtu
||
601 ((first_len
- hlen
) & 7) ||
605 skb_walk_frags(skb
, frag
) {
606 /* Correct geometry. */
607 if (frag
->len
> mtu
||
608 ((frag
->len
& 7) && frag
->next
) ||
609 skb_headroom(frag
) < hlen
)
610 goto slow_path_clean
;
612 /* Partially cloned skb? */
613 if (skb_shared(frag
))
614 goto slow_path_clean
;
619 frag
->destructor
= sock_wfree
;
621 skb
->truesize
-= frag
->truesize
;
626 frag
= skb_shinfo(skb
)->frag_list
;
627 skb_frag_list_init(skb
);
630 *prevhdr
= NEXTHDR_FRAGMENT
;
631 tmp_hdr
= kmemdup(skb_network_header(skb
), hlen
, GFP_ATOMIC
);
633 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
634 IPSTATS_MIB_FRAGFAILS
);
638 __skb_pull(skb
, hlen
);
639 fh
= (struct frag_hdr
*)__skb_push(skb
, sizeof(struct frag_hdr
));
640 __skb_push(skb
, hlen
);
641 skb_reset_network_header(skb
);
642 memcpy(skb_network_header(skb
), tmp_hdr
, hlen
);
644 ipv6_select_ident(fh
, rt
);
645 fh
->nexthdr
= nexthdr
;
647 fh
->frag_off
= htons(IP6_MF
);
648 frag_id
= fh
->identification
;
650 first_len
= skb_pagelen(skb
);
651 skb
->data_len
= first_len
- skb_headlen(skb
);
652 skb
->len
= first_len
;
653 ipv6_hdr(skb
)->payload_len
= htons(first_len
-
654 sizeof(struct ipv6hdr
));
659 /* Prepare header of the next frame,
660 * before previous one went down. */
662 frag
->ip_summed
= CHECKSUM_NONE
;
663 skb_reset_transport_header(frag
);
664 fh
= (struct frag_hdr
*)__skb_push(frag
, sizeof(struct frag_hdr
));
665 __skb_push(frag
, hlen
);
666 skb_reset_network_header(frag
);
667 memcpy(skb_network_header(frag
), tmp_hdr
,
669 offset
+= skb
->len
- hlen
- sizeof(struct frag_hdr
);
670 fh
->nexthdr
= nexthdr
;
672 fh
->frag_off
= htons(offset
);
673 if (frag
->next
!= NULL
)
674 fh
->frag_off
|= htons(IP6_MF
);
675 fh
->identification
= frag_id
;
676 ipv6_hdr(frag
)->payload_len
=
678 sizeof(struct ipv6hdr
));
679 ip6_copy_metadata(frag
, skb
);
684 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
685 IPSTATS_MIB_FRAGCREATES
);
698 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
699 IPSTATS_MIB_FRAGOKS
);
704 kfree_skb_list(frag
);
706 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
707 IPSTATS_MIB_FRAGFAILS
);
712 skb_walk_frags(skb
, frag2
) {
716 frag2
->destructor
= NULL
;
717 skb
->truesize
+= frag2
->truesize
;
722 if ((skb
->ip_summed
== CHECKSUM_PARTIAL
) &&
723 skb_checksum_help(skb
))
726 left
= skb
->len
- hlen
; /* Space per frame */
727 ptr
= hlen
; /* Where to start from */
730 * Fragment the datagram.
733 *prevhdr
= NEXTHDR_FRAGMENT
;
734 hroom
= LL_RESERVED_SPACE(rt
->dst
.dev
);
735 troom
= rt
->dst
.dev
->needed_tailroom
;
738 * Keep copying data until we run out.
742 /* IF: it doesn't fit, use 'mtu' - the data space left */
745 /* IF: we are not sending up to and including the packet end
746 then align the next start on an eight byte boundary */
751 /* Allocate buffer */
752 frag
= alloc_skb(len
+ hlen
+ sizeof(struct frag_hdr
) +
753 hroom
+ troom
, GFP_ATOMIC
);
755 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
756 IPSTATS_MIB_FRAGFAILS
);
762 * Set up data on packet
765 ip6_copy_metadata(frag
, skb
);
766 skb_reserve(frag
, hroom
);
767 skb_put(frag
, len
+ hlen
+ sizeof(struct frag_hdr
));
768 skb_reset_network_header(frag
);
769 fh
= (struct frag_hdr
*)(skb_network_header(frag
) + hlen
);
770 frag
->transport_header
= (frag
->network_header
+ hlen
+
771 sizeof(struct frag_hdr
));
774 * Charge the memory for the fragment to any owner
778 skb_set_owner_w(frag
, skb
->sk
);
781 * Copy the packet header into the new buffer.
783 skb_copy_from_linear_data(skb
, skb_network_header(frag
), hlen
);
786 * Build fragment header.
788 fh
->nexthdr
= nexthdr
;
791 ipv6_select_ident(fh
, rt
);
792 frag_id
= fh
->identification
;
794 fh
->identification
= frag_id
;
797 * Copy a block of the IP datagram.
799 BUG_ON(skb_copy_bits(skb
, ptr
, skb_transport_header(frag
),
803 fh
->frag_off
= htons(offset
);
805 fh
->frag_off
|= htons(IP6_MF
);
806 ipv6_hdr(frag
)->payload_len
= htons(frag
->len
-
807 sizeof(struct ipv6hdr
));
813 * Put this fragment into the sending queue.
819 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
820 IPSTATS_MIB_FRAGCREATES
);
822 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
823 IPSTATS_MIB_FRAGOKS
);
828 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
829 IPSTATS_MIB_FRAGFAILS
);
834 static inline int ip6_rt_check(const struct rt6key
*rt_key
,
835 const struct in6_addr
*fl_addr
,
836 const struct in6_addr
*addr_cache
)
838 return (rt_key
->plen
!= 128 || !ipv6_addr_equal(fl_addr
, &rt_key
->addr
)) &&
839 (addr_cache
== NULL
|| !ipv6_addr_equal(fl_addr
, addr_cache
));
842 static struct dst_entry
*ip6_sk_dst_check(struct sock
*sk
,
843 struct dst_entry
*dst
,
844 const struct flowi6
*fl6
)
846 struct ipv6_pinfo
*np
= inet6_sk(sk
);
852 if (dst
->ops
->family
!= AF_INET6
) {
857 rt
= (struct rt6_info
*)dst
;
858 /* Yes, checking route validity in not connected
859 * case is not very simple. Take into account,
860 * that we do not support routing by source, TOS,
861 * and MSG_DONTROUTE --ANK (980726)
863 * 1. ip6_rt_check(): If route was host route,
864 * check that cached destination is current.
865 * If it is network route, we still may
866 * check its validity using saved pointer
867 * to the last used address: daddr_cache.
868 * We do not want to save whole address now,
869 * (because main consumer of this service
870 * is tcp, which has not this problem),
871 * so that the last trick works only on connected
873 * 2. oif also should be the same.
875 if (ip6_rt_check(&rt
->rt6i_dst
, &fl6
->daddr
, np
->daddr_cache
) ||
876 #ifdef CONFIG_IPV6_SUBTREES
877 ip6_rt_check(&rt
->rt6i_src
, &fl6
->saddr
, np
->saddr_cache
) ||
879 (fl6
->flowi6_oif
&& fl6
->flowi6_oif
!= dst
->dev
->ifindex
)) {
888 static int ip6_dst_lookup_tail(struct sock
*sk
,
889 struct dst_entry
**dst
, struct flowi6
*fl6
)
891 struct net
*net
= sock_net(sk
);
892 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
899 *dst
= ip6_route_output(net
, sk
, fl6
);
903 goto out_err_release
;
905 if (ipv6_addr_any(&fl6
->saddr
)) {
906 struct rt6_info
*rt
= (struct rt6_info
*) *dst
;
907 err
= ip6_route_get_saddr(net
, rt
, &fl6
->daddr
,
908 sk
? inet6_sk(sk
)->srcprefs
: 0,
911 goto out_err_release
;
914 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
916 * Here if the dst entry we've looked up
917 * has a neighbour entry that is in the INCOMPLETE
918 * state and the src address from the flow is
919 * marked as OPTIMISTIC, we release the found
920 * dst entry and replace it instead with the
921 * dst entry of the nexthop router
923 rt
= (struct rt6_info
*) *dst
;
925 n
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, rt6_nexthop(rt
));
926 err
= n
&& !(n
->nud_state
& NUD_VALID
) ? -EINVAL
: 0;
927 rcu_read_unlock_bh();
930 struct inet6_ifaddr
*ifp
;
931 struct flowi6 fl_gw6
;
934 ifp
= ipv6_get_ifaddr(net
, &fl6
->saddr
,
937 redirect
= (ifp
&& ifp
->flags
& IFA_F_OPTIMISTIC
);
943 * We need to get the dst entry for the
944 * default router instead
947 memcpy(&fl_gw6
, fl6
, sizeof(struct flowi6
));
948 memset(&fl_gw6
.daddr
, 0, sizeof(struct in6_addr
));
949 *dst
= ip6_route_output(net
, sk
, &fl_gw6
);
952 goto out_err_release
;
960 if (err
== -ENETUNREACH
)
961 IP6_INC_STATS(net
, NULL
, IPSTATS_MIB_OUTNOROUTES
);
968 * ip6_dst_lookup - perform route lookup on flow
969 * @sk: socket which provides route info
970 * @dst: pointer to dst_entry * for result
971 * @fl6: flow to lookup
973 * This function performs a route lookup on the given flow.
975 * It returns zero on success, or a standard errno code on error.
977 int ip6_dst_lookup(struct sock
*sk
, struct dst_entry
**dst
, struct flowi6
*fl6
)
980 return ip6_dst_lookup_tail(sk
, dst
, fl6
);
982 EXPORT_SYMBOL_GPL(ip6_dst_lookup
);
985 * ip6_dst_lookup_flow - perform route lookup on flow with ipsec
986 * @sk: socket which provides route info
987 * @fl6: flow to lookup
988 * @final_dst: final destination address for ipsec lookup
990 * This function performs a route lookup on the given flow.
992 * It returns a valid dst pointer on success, or a pointer encoded
995 struct dst_entry
*ip6_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
996 const struct in6_addr
*final_dst
)
998 struct dst_entry
*dst
= NULL
;
1001 err
= ip6_dst_lookup_tail(sk
, &dst
, fl6
);
1003 return ERR_PTR(err
);
1005 fl6
->daddr
= *final_dst
;
1007 return xfrm_lookup_route(sock_net(sk
), dst
, flowi6_to_flowi(fl6
), sk
, 0);
1009 EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow
);
1012 * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow
1013 * @sk: socket which provides the dst cache and route info
1014 * @fl6: flow to lookup
1015 * @final_dst: final destination address for ipsec lookup
1017 * This function performs a route lookup on the given flow with the
1018 * possibility of using the cached route in the socket if it is valid.
1019 * It will take the socket dst lock when operating on the dst cache.
1020 * As a result, this function can only be used in process context.
1022 * It returns a valid dst pointer on success, or a pointer encoded
1025 struct dst_entry
*ip6_sk_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
1026 const struct in6_addr
*final_dst
)
1028 struct dst_entry
*dst
= sk_dst_check(sk
, inet6_sk(sk
)->dst_cookie
);
1031 dst
= ip6_sk_dst_check(sk
, dst
, fl6
);
1033 err
= ip6_dst_lookup_tail(sk
, &dst
, fl6
);
1035 return ERR_PTR(err
);
1037 fl6
->daddr
= *final_dst
;
1039 return xfrm_lookup_route(sock_net(sk
), dst
, flowi6_to_flowi(fl6
), sk
, 0);
1041 EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow
);
1043 static inline int ip6_ufo_append_data(struct sock
*sk
,
1044 int getfrag(void *from
, char *to
, int offset
, int len
,
1045 int odd
, struct sk_buff
*skb
),
1046 void *from
, int length
, int hh_len
, int fragheaderlen
,
1047 int transhdrlen
, int mtu
, unsigned int flags
,
1048 struct rt6_info
*rt
)
1051 struct sk_buff
*skb
;
1052 struct frag_hdr fhdr
;
1055 /* There is support for UDP large send offload by network
1056 * device, so create one single skb packet containing complete
1059 skb
= skb_peek_tail(&sk
->sk_write_queue
);
1061 skb
= sock_alloc_send_skb(sk
,
1062 hh_len
+ fragheaderlen
+ transhdrlen
+ 20,
1063 (flags
& MSG_DONTWAIT
), &err
);
1067 /* reserve space for Hardware header */
1068 skb_reserve(skb
, hh_len
);
1070 /* create space for UDP/IP header */
1071 skb_put(skb
, fragheaderlen
+ transhdrlen
);
1073 /* initialize network header pointer */
1074 skb_reset_network_header(skb
);
1076 /* initialize protocol header pointer */
1077 skb
->transport_header
= skb
->network_header
+ fragheaderlen
;
1079 skb
->protocol
= htons(ETH_P_IPV6
);
1082 __skb_queue_tail(&sk
->sk_write_queue
, skb
);
1083 } else if (skb_is_gso(skb
)) {
1087 skb
->ip_summed
= CHECKSUM_PARTIAL
;
1088 /* Specify the length of each IPv6 datagram fragment.
1089 * It has to be a multiple of 8.
1091 skb_shinfo(skb
)->gso_size
= (mtu
- fragheaderlen
-
1092 sizeof(struct frag_hdr
)) & ~7;
1093 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
1094 ipv6_select_ident(&fhdr
, rt
);
1095 skb_shinfo(skb
)->ip6_frag_id
= fhdr
.identification
;
1098 return skb_append_datato_frags(sk
, skb
, getfrag
, from
,
1099 (length
- transhdrlen
));
1102 static inline struct ipv6_opt_hdr
*ip6_opt_dup(struct ipv6_opt_hdr
*src
,
1105 return src
? kmemdup(src
, (src
->hdrlen
+ 1) * 8, gfp
) : NULL
;
1108 static inline struct ipv6_rt_hdr
*ip6_rthdr_dup(struct ipv6_rt_hdr
*src
,
1111 return src
? kmemdup(src
, (src
->hdrlen
+ 1) * 8, gfp
) : NULL
;
1114 static void ip6_append_data_mtu(unsigned int *mtu
,
1116 unsigned int fragheaderlen
,
1117 struct sk_buff
*skb
,
1118 struct rt6_info
*rt
,
1119 unsigned int orig_mtu
)
1121 if (!(rt
->dst
.flags
& DST_XFRM_TUNNEL
)) {
1123 /* first fragment, reserve header_len */
1124 *mtu
= orig_mtu
- rt
->dst
.header_len
;
1128 * this fragment is not first, the headers
1129 * space is regarded as data space.
1133 *maxfraglen
= ((*mtu
- fragheaderlen
) & ~7)
1134 + fragheaderlen
- sizeof(struct frag_hdr
);
1138 int ip6_append_data(struct sock
*sk
, int getfrag(void *from
, char *to
,
1139 int offset
, int len
, int odd
, struct sk_buff
*skb
),
1140 void *from
, int length
, int transhdrlen
,
1141 int hlimit
, int tclass
, struct ipv6_txoptions
*opt
, struct flowi6
*fl6
,
1142 struct rt6_info
*rt
, unsigned int flags
, int dontfrag
)
1144 struct inet_sock
*inet
= inet_sk(sk
);
1145 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1146 struct inet_cork
*cork
;
1147 struct sk_buff
*skb
, *skb_prev
= NULL
;
1148 unsigned int maxfraglen
, fragheaderlen
, mtu
, orig_mtu
;
1158 if (flags
&MSG_PROBE
)
1160 cork
= &inet
->cork
.base
;
1161 if (skb_queue_empty(&sk
->sk_write_queue
)) {
1166 if (WARN_ON(np
->cork
.opt
))
1169 np
->cork
.opt
= kzalloc(opt
->tot_len
, sk
->sk_allocation
);
1170 if (unlikely(np
->cork
.opt
== NULL
))
1173 np
->cork
.opt
->tot_len
= opt
->tot_len
;
1174 np
->cork
.opt
->opt_flen
= opt
->opt_flen
;
1175 np
->cork
.opt
->opt_nflen
= opt
->opt_nflen
;
1177 np
->cork
.opt
->dst0opt
= ip6_opt_dup(opt
->dst0opt
,
1179 if (opt
->dst0opt
&& !np
->cork
.opt
->dst0opt
)
1182 np
->cork
.opt
->dst1opt
= ip6_opt_dup(opt
->dst1opt
,
1184 if (opt
->dst1opt
&& !np
->cork
.opt
->dst1opt
)
1187 np
->cork
.opt
->hopopt
= ip6_opt_dup(opt
->hopopt
,
1189 if (opt
->hopopt
&& !np
->cork
.opt
->hopopt
)
1192 np
->cork
.opt
->srcrt
= ip6_rthdr_dup(opt
->srcrt
,
1194 if (opt
->srcrt
&& !np
->cork
.opt
->srcrt
)
1197 /* need source address above miyazawa*/
1200 cork
->dst
= &rt
->dst
;
1201 inet
->cork
.fl
.u
.ip6
= *fl6
;
1202 np
->cork
.hop_limit
= hlimit
;
1203 np
->cork
.tclass
= tclass
;
1204 if (rt
->dst
.flags
& DST_XFRM_TUNNEL
)
1205 mtu
= np
->pmtudisc
>= IPV6_PMTUDISC_PROBE
?
1206 rt
->dst
.dev
->mtu
: dst_mtu(&rt
->dst
);
1208 mtu
= np
->pmtudisc
>= IPV6_PMTUDISC_PROBE
?
1209 rt
->dst
.dev
->mtu
: dst_mtu(rt
->dst
.path
);
1210 if (np
->frag_size
< mtu
) {
1212 mtu
= np
->frag_size
;
1214 cork
->fragsize
= mtu
;
1215 if (dst_allfrag(rt
->dst
.path
))
1216 cork
->flags
|= IPCORK_ALLFRAG
;
1218 exthdrlen
= (opt
? opt
->opt_flen
: 0);
1219 length
+= exthdrlen
;
1220 transhdrlen
+= exthdrlen
;
1221 dst_exthdrlen
= rt
->dst
.header_len
- rt
->rt6i_nfheader_len
;
1223 rt
= (struct rt6_info
*)cork
->dst
;
1224 fl6
= &inet
->cork
.fl
.u
.ip6
;
1229 mtu
= cork
->fragsize
;
1233 hh_len
= LL_RESERVED_SPACE(rt
->dst
.dev
);
1235 fragheaderlen
= sizeof(struct ipv6hdr
) + rt
->rt6i_nfheader_len
+
1236 (opt
? opt
->opt_nflen
: 0);
1237 maxfraglen
= ((mtu
- fragheaderlen
) & ~7) + fragheaderlen
-
1238 sizeof(struct frag_hdr
);
1240 if (mtu
<= sizeof(struct ipv6hdr
) + IPV6_MAXPLEN
) {
1241 unsigned int maxnonfragsize
, headersize
;
1243 headersize
= sizeof(struct ipv6hdr
) +
1244 (opt
? opt
->opt_flen
+ opt
->opt_nflen
: 0) +
1245 (dst_allfrag(&rt
->dst
) ?
1246 sizeof(struct frag_hdr
) : 0) +
1247 rt
->rt6i_nfheader_len
;
1249 if (ip6_sk_ignore_df(sk
))
1250 maxnonfragsize
= sizeof(struct ipv6hdr
) + IPV6_MAXPLEN
;
1252 maxnonfragsize
= mtu
;
1254 /* dontfrag active */
1255 if ((cork
->length
+ length
> mtu
- headersize
) && dontfrag
&&
1256 (sk
->sk_protocol
== IPPROTO_UDP
||
1257 sk
->sk_protocol
== IPPROTO_RAW
)) {
1258 ipv6_local_rxpmtu(sk
, fl6
, mtu
- headersize
+
1259 sizeof(struct ipv6hdr
));
1263 if (cork
->length
+ length
> maxnonfragsize
- headersize
) {
1265 ipv6_local_error(sk
, EMSGSIZE
, fl6
,
1267 sizeof(struct ipv6hdr
));
1272 if (sk
->sk_type
== SOCK_DGRAM
|| sk
->sk_type
== SOCK_RAW
) {
1273 sock_tx_timestamp(sk
, &tx_flags
);
1274 if (tx_flags
& SKBTX_ANY_SW_TSTAMP
&&
1275 sk
->sk_tsflags
& SOF_TIMESTAMPING_OPT_ID
)
1276 tskey
= sk
->sk_tskey
++;
1280 * Let's try using as much space as possible.
1281 * Use MTU if total length of the message fits into the MTU.
1282 * Otherwise, we need to reserve fragment header and
1283 * fragment alignment (= 8-15 octects, in total).
1285 * Note that we may need to "move" the data from the tail of
1286 * of the buffer to the new fragment when we split
1289 * FIXME: It may be fragmented into multiple chunks
1290 * at once if non-fragmentable extension headers
1295 skb
= skb_peek_tail(&sk
->sk_write_queue
);
1296 cork
->length
+= length
;
1297 if (((length
> mtu
) ||
1298 (skb
&& skb_is_gso(skb
))) &&
1299 (sk
->sk_protocol
== IPPROTO_UDP
) &&
1300 (rt
->dst
.dev
->features
& NETIF_F_UFO
)) {
1301 err
= ip6_ufo_append_data(sk
, getfrag
, from
, length
,
1302 hh_len
, fragheaderlen
,
1303 transhdrlen
, mtu
, flags
, rt
);
1312 while (length
> 0) {
1313 /* Check if the remaining data fits into current packet. */
1314 copy
= (cork
->length
<= mtu
&& !(cork
->flags
& IPCORK_ALLFRAG
) ? mtu
: maxfraglen
) - skb
->len
;
1316 copy
= maxfraglen
- skb
->len
;
1320 unsigned int datalen
;
1321 unsigned int fraglen
;
1322 unsigned int fraggap
;
1323 unsigned int alloclen
;
1325 /* There's no room in the current skb */
1327 fraggap
= skb
->len
- maxfraglen
;
1330 /* update mtu and maxfraglen if necessary */
1331 if (skb
== NULL
|| skb_prev
== NULL
)
1332 ip6_append_data_mtu(&mtu
, &maxfraglen
,
1333 fragheaderlen
, skb
, rt
,
1339 * If remaining data exceeds the mtu,
1340 * we know we need more fragment(s).
1342 datalen
= length
+ fraggap
;
1344 if (datalen
> (cork
->length
<= mtu
&& !(cork
->flags
& IPCORK_ALLFRAG
) ? mtu
: maxfraglen
) - fragheaderlen
)
1345 datalen
= maxfraglen
- fragheaderlen
- rt
->dst
.trailer_len
;
1346 if ((flags
& MSG_MORE
) &&
1347 !(rt
->dst
.dev
->features
&NETIF_F_SG
))
1350 alloclen
= datalen
+ fragheaderlen
;
1352 alloclen
+= dst_exthdrlen
;
1354 if (datalen
!= length
+ fraggap
) {
1356 * this is not the last fragment, the trailer
1357 * space is regarded as data space.
1359 datalen
+= rt
->dst
.trailer_len
;
1362 alloclen
+= rt
->dst
.trailer_len
;
1363 fraglen
= datalen
+ fragheaderlen
;
1366 * We just reserve space for fragment header.
1367 * Note: this may be overallocation if the message
1368 * (without MSG_MORE) fits into the MTU.
1370 alloclen
+= sizeof(struct frag_hdr
);
1373 skb
= sock_alloc_send_skb(sk
,
1375 (flags
& MSG_DONTWAIT
), &err
);
1378 if (atomic_read(&sk
->sk_wmem_alloc
) <=
1380 skb
= sock_wmalloc(sk
,
1381 alloclen
+ hh_len
, 1,
1383 if (unlikely(skb
== NULL
))
1389 * Fill in the control structures
1391 skb
->protocol
= htons(ETH_P_IPV6
);
1392 skb
->ip_summed
= CHECKSUM_NONE
;
1394 /* reserve for fragmentation and ipsec header */
1395 skb_reserve(skb
, hh_len
+ sizeof(struct frag_hdr
) +
1398 /* Only the initial fragment is time stamped */
1399 skb_shinfo(skb
)->tx_flags
= tx_flags
;
1401 skb_shinfo(skb
)->tskey
= tskey
;
1405 * Find where to start putting bytes
1407 data
= skb_put(skb
, fraglen
);
1408 skb_set_network_header(skb
, exthdrlen
);
1409 data
+= fragheaderlen
;
1410 skb
->transport_header
= (skb
->network_header
+
1413 skb
->csum
= skb_copy_and_csum_bits(
1414 skb_prev
, maxfraglen
,
1415 data
+ transhdrlen
, fraggap
, 0);
1416 skb_prev
->csum
= csum_sub(skb_prev
->csum
,
1419 pskb_trim_unique(skb_prev
, maxfraglen
);
1421 copy
= datalen
- transhdrlen
- fraggap
;
1427 } else if (copy
> 0 && getfrag(from
, data
+ transhdrlen
, offset
, copy
, fraggap
, skb
) < 0) {
1434 length
-= datalen
- fraggap
;
1440 * Put the packet on the pending queue
1442 __skb_queue_tail(&sk
->sk_write_queue
, skb
);
1449 if (!(rt
->dst
.dev
->features
&NETIF_F_SG
)) {
1453 if (getfrag(from
, skb_put(skb
, copy
),
1454 offset
, copy
, off
, skb
) < 0) {
1455 __skb_trim(skb
, off
);
1460 int i
= skb_shinfo(skb
)->nr_frags
;
1461 struct page_frag
*pfrag
= sk_page_frag(sk
);
1464 if (!sk_page_frag_refill(sk
, pfrag
))
1467 if (!skb_can_coalesce(skb
, i
, pfrag
->page
,
1470 if (i
== MAX_SKB_FRAGS
)
1473 __skb_fill_page_desc(skb
, i
, pfrag
->page
,
1475 skb_shinfo(skb
)->nr_frags
= ++i
;
1476 get_page(pfrag
->page
);
1478 copy
= min_t(int, copy
, pfrag
->size
- pfrag
->offset
);
1480 page_address(pfrag
->page
) + pfrag
->offset
,
1481 offset
, copy
, skb
->len
, skb
) < 0)
1484 pfrag
->offset
+= copy
;
1485 skb_frag_size_add(&skb_shinfo(skb
)->frags
[i
- 1], copy
);
1487 skb
->data_len
+= copy
;
1488 skb
->truesize
+= copy
;
1489 atomic_add(copy
, &sk
->sk_wmem_alloc
);
1500 cork
->length
-= length
;
1501 IP6_INC_STATS(sock_net(sk
), rt
->rt6i_idev
, IPSTATS_MIB_OUTDISCARDS
);
1504 EXPORT_SYMBOL_GPL(ip6_append_data
);
1506 static void ip6_cork_release(struct inet_sock
*inet
, struct ipv6_pinfo
*np
)
1509 kfree(np
->cork
.opt
->dst0opt
);
1510 kfree(np
->cork
.opt
->dst1opt
);
1511 kfree(np
->cork
.opt
->hopopt
);
1512 kfree(np
->cork
.opt
->srcrt
);
1513 kfree(np
->cork
.opt
);
1514 np
->cork
.opt
= NULL
;
1517 if (inet
->cork
.base
.dst
) {
1518 dst_release(inet
->cork
.base
.dst
);
1519 inet
->cork
.base
.dst
= NULL
;
1520 inet
->cork
.base
.flags
&= ~IPCORK_ALLFRAG
;
1522 memset(&inet
->cork
.fl
, 0, sizeof(inet
->cork
.fl
));
1525 int ip6_push_pending_frames(struct sock
*sk
)
1527 struct sk_buff
*skb
, *tmp_skb
;
1528 struct sk_buff
**tail_skb
;
1529 struct in6_addr final_dst_buf
, *final_dst
= &final_dst_buf
;
1530 struct inet_sock
*inet
= inet_sk(sk
);
1531 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1532 struct net
*net
= sock_net(sk
);
1533 struct ipv6hdr
*hdr
;
1534 struct ipv6_txoptions
*opt
= np
->cork
.opt
;
1535 struct rt6_info
*rt
= (struct rt6_info
*)inet
->cork
.base
.dst
;
1536 struct flowi6
*fl6
= &inet
->cork
.fl
.u
.ip6
;
1537 unsigned char proto
= fl6
->flowi6_proto
;
1540 skb
= __skb_dequeue(&sk
->sk_write_queue
);
1543 tail_skb
= &(skb_shinfo(skb
)->frag_list
);
1545 /* move skb->data to ip header from ext header */
1546 if (skb
->data
< skb_network_header(skb
))
1547 __skb_pull(skb
, skb_network_offset(skb
));
1548 while ((tmp_skb
= __skb_dequeue(&sk
->sk_write_queue
)) != NULL
) {
1549 __skb_pull(tmp_skb
, skb_network_header_len(skb
));
1550 *tail_skb
= tmp_skb
;
1551 tail_skb
= &(tmp_skb
->next
);
1552 skb
->len
+= tmp_skb
->len
;
1553 skb
->data_len
+= tmp_skb
->len
;
1554 skb
->truesize
+= tmp_skb
->truesize
;
1555 tmp_skb
->destructor
= NULL
;
1559 /* Allow local fragmentation. */
1560 skb
->ignore_df
= ip6_sk_ignore_df(sk
);
1562 *final_dst
= fl6
->daddr
;
1563 __skb_pull(skb
, skb_network_header_len(skb
));
1564 if (opt
&& opt
->opt_flen
)
1565 ipv6_push_frag_opts(skb
, opt
, &proto
);
1566 if (opt
&& opt
->opt_nflen
)
1567 ipv6_push_nfrag_opts(skb
, opt
, &proto
, &final_dst
);
1569 skb_push(skb
, sizeof(struct ipv6hdr
));
1570 skb_reset_network_header(skb
);
1571 hdr
= ipv6_hdr(skb
);
1573 ip6_flow_hdr(hdr
, np
->cork
.tclass
,
1574 ip6_make_flowlabel(net
, skb
, fl6
->flowlabel
,
1575 np
->autoflowlabel
));
1576 hdr
->hop_limit
= np
->cork
.hop_limit
;
1577 hdr
->nexthdr
= proto
;
1578 hdr
->saddr
= fl6
->saddr
;
1579 hdr
->daddr
= *final_dst
;
1581 skb
->priority
= sk
->sk_priority
;
1582 skb
->mark
= sk
->sk_mark
;
1584 skb_dst_set(skb
, dst_clone(&rt
->dst
));
1585 IP6_UPD_PO_STATS(net
, rt
->rt6i_idev
, IPSTATS_MIB_OUT
, skb
->len
);
1586 if (proto
== IPPROTO_ICMPV6
) {
1587 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
1589 ICMP6MSGOUT_INC_STATS(net
, idev
, icmp6_hdr(skb
)->icmp6_type
);
1590 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTMSGS
);
1593 err
= ip6_local_out(skb
);
1596 err
= net_xmit_errno(err
);
1602 ip6_cork_release(inet
, np
);
1605 IP6_INC_STATS(net
, rt
->rt6i_idev
, IPSTATS_MIB_OUTDISCARDS
);
1608 EXPORT_SYMBOL_GPL(ip6_push_pending_frames
);
1610 void ip6_flush_pending_frames(struct sock
*sk
)
1612 struct sk_buff
*skb
;
1614 while ((skb
= __skb_dequeue_tail(&sk
->sk_write_queue
)) != NULL
) {
1616 IP6_INC_STATS(sock_net(sk
), ip6_dst_idev(skb_dst(skb
)),
1617 IPSTATS_MIB_OUTDISCARDS
);
1621 ip6_cork_release(inet_sk(sk
), inet6_sk(sk
));
1623 EXPORT_SYMBOL_GPL(ip6_flush_pending_frames
);