2 * IPv6 output functions
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/net/ipv4/ip_output.c
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 * A.N.Kuznetsov : airthmetics in fragmentation.
17 * extension headers are implemented.
18 * route changes now work.
19 * ip6_forward does not confuse sniffers.
22 * H. von Brand : Added missing #include <linux/string.h>
23 * Imran Patel : frag id should be in NBO
24 * Kazunori MIYAZAWA @USAGI
25 * : add ip6_append_data and related functions
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/string.h>
32 #include <linux/socket.h>
33 #include <linux/net.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/in6.h>
37 #include <linux/tcp.h>
38 #include <linux/route.h>
39 #include <linux/module.h>
40 #include <linux/slab.h>
42 #include <linux/netfilter.h>
43 #include <linux/netfilter_ipv6.h>
49 #include <net/ndisc.h>
50 #include <net/protocol.h>
51 #include <net/ip6_route.h>
52 #include <net/addrconf.h>
53 #include <net/rawv6.h>
56 #include <net/checksum.h>
57 #include <linux/mroute6.h>
59 int __ip6_local_out(struct sk_buff
*skb
)
63 len
= skb
->len
- sizeof(struct ipv6hdr
);
64 if (len
> IPV6_MAXPLEN
)
66 ipv6_hdr(skb
)->payload_len
= htons(len
);
68 return nf_hook(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, skb
, NULL
,
69 skb_dst(skb
)->dev
, dst_output
);
72 int ip6_local_out(struct sk_buff
*skb
)
76 err
= __ip6_local_out(skb
);
78 err
= dst_output(skb
);
82 EXPORT_SYMBOL_GPL(ip6_local_out
);
84 static int ip6_finish_output2(struct sk_buff
*skb
)
86 struct dst_entry
*dst
= skb_dst(skb
);
87 struct net_device
*dev
= dst
->dev
;
88 struct neighbour
*neigh
;
89 struct in6_addr
*nexthop
;
92 skb
->protocol
= htons(ETH_P_IPV6
);
95 if (ipv6_addr_is_multicast(&ipv6_hdr(skb
)->daddr
)) {
96 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
98 if (!(dev
->flags
& IFF_LOOPBACK
) && sk_mc_loop(skb
->sk
) &&
99 ((mroute6_socket(dev_net(dev
), skb
) &&
100 !(IP6CB(skb
)->flags
& IP6SKB_FORWARDED
)) ||
101 ipv6_chk_mcast_addr(dev
, &ipv6_hdr(skb
)->daddr
,
102 &ipv6_hdr(skb
)->saddr
))) {
103 struct sk_buff
*newskb
= skb_clone(skb
, GFP_ATOMIC
);
105 /* Do not check for IFF_ALLMULTI; multicast routing
106 is not supported in any case.
109 NF_HOOK(NFPROTO_IPV6
, NF_INET_POST_ROUTING
,
110 newskb
, NULL
, newskb
->dev
,
113 if (ipv6_hdr(skb
)->hop_limit
== 0) {
114 IP6_INC_STATS(dev_net(dev
), idev
,
115 IPSTATS_MIB_OUTDISCARDS
);
121 IP6_UPD_PO_STATS(dev_net(dev
), idev
, IPSTATS_MIB_OUTMCAST
,
124 if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb
)->daddr
) <=
125 IPV6_ADDR_SCOPE_NODELOCAL
&&
126 !(dev
->flags
& IFF_LOOPBACK
)) {
133 nexthop
= rt6_nexthop((struct rt6_info
*)dst
);
134 neigh
= __ipv6_neigh_lookup_noref(dst
->dev
, nexthop
);
135 if (unlikely(!neigh
))
136 neigh
= __neigh_create(&nd_tbl
, nexthop
, dst
->dev
, false);
137 if (!IS_ERR(neigh
)) {
138 ret
= dst_neigh_output(dst
, neigh
, skb
);
139 rcu_read_unlock_bh();
142 rcu_read_unlock_bh();
144 IP6_INC_STATS(dev_net(dst
->dev
),
145 ip6_dst_idev(dst
), IPSTATS_MIB_OUTNOROUTES
);
150 static int ip6_finish_output(struct sk_buff
*skb
)
152 if ((skb
->len
> ip6_skb_dst_mtu(skb
) && !skb_is_gso(skb
)) ||
153 dst_allfrag(skb_dst(skb
)) ||
154 (IP6CB(skb
)->frag_max_size
&& skb
->len
> IP6CB(skb
)->frag_max_size
))
155 return ip6_fragment(skb
, ip6_finish_output2
);
157 return ip6_finish_output2(skb
);
160 int ip6_output(struct sk_buff
*skb
)
162 struct net_device
*dev
= skb_dst(skb
)->dev
;
163 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
164 if (unlikely(idev
->cnf
.disable_ipv6
)) {
165 IP6_INC_STATS(dev_net(dev
), idev
,
166 IPSTATS_MIB_OUTDISCARDS
);
171 return NF_HOOK_COND(NFPROTO_IPV6
, NF_INET_POST_ROUTING
, skb
, NULL
, dev
,
173 !(IP6CB(skb
)->flags
& IP6SKB_REROUTED
));
177 * xmit an sk_buff (used by TCP, SCTP and DCCP)
180 int ip6_xmit(struct sock
*sk
, struct sk_buff
*skb
, struct flowi6
*fl6
,
181 struct ipv6_txoptions
*opt
, int tclass
)
183 struct net
*net
= sock_net(sk
);
184 struct ipv6_pinfo
*np
= inet6_sk(sk
);
185 struct in6_addr
*first_hop
= &fl6
->daddr
;
186 struct dst_entry
*dst
= skb_dst(skb
);
188 u8 proto
= fl6
->flowi6_proto
;
189 int seg_len
= skb
->len
;
194 unsigned int head_room
;
196 /* First: exthdrs may take lots of space (~8K for now)
197 MAX_HEADER is not enough.
199 head_room
= opt
->opt_nflen
+ opt
->opt_flen
;
200 seg_len
+= head_room
;
201 head_room
+= sizeof(struct ipv6hdr
) + LL_RESERVED_SPACE(dst
->dev
);
203 if (skb_headroom(skb
) < head_room
) {
204 struct sk_buff
*skb2
= skb_realloc_headroom(skb
, head_room
);
206 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
207 IPSTATS_MIB_OUTDISCARDS
);
213 skb_set_owner_w(skb
, sk
);
216 ipv6_push_frag_opts(skb
, opt
, &proto
);
218 ipv6_push_nfrag_opts(skb
, opt
, &proto
, &first_hop
);
221 skb_push(skb
, sizeof(struct ipv6hdr
));
222 skb_reset_network_header(skb
);
226 * Fill in the IPv6 header
229 hlimit
= np
->hop_limit
;
231 hlimit
= ip6_dst_hoplimit(dst
);
233 ip6_flow_hdr(hdr
, tclass
, fl6
->flowlabel
);
235 hdr
->payload_len
= htons(seg_len
);
236 hdr
->nexthdr
= proto
;
237 hdr
->hop_limit
= hlimit
;
239 hdr
->saddr
= fl6
->saddr
;
240 hdr
->daddr
= *first_hop
;
242 skb
->priority
= sk
->sk_priority
;
243 skb
->mark
= sk
->sk_mark
;
246 if ((skb
->len
<= mtu
) || skb
->local_df
|| skb_is_gso(skb
)) {
247 IP6_UPD_PO_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
248 IPSTATS_MIB_OUT
, skb
->len
);
249 return NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, skb
, NULL
,
250 dst
->dev
, dst_output
);
254 ipv6_local_error(sk
, EMSGSIZE
, fl6
, mtu
);
255 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_FRAGFAILS
);
260 EXPORT_SYMBOL(ip6_xmit
);
262 static int ip6_call_ra_chain(struct sk_buff
*skb
, int sel
)
264 struct ip6_ra_chain
*ra
;
265 struct sock
*last
= NULL
;
267 read_lock(&ip6_ra_lock
);
268 for (ra
= ip6_ra_chain
; ra
; ra
= ra
->next
) {
269 struct sock
*sk
= ra
->sk
;
270 if (sk
&& ra
->sel
== sel
&&
271 (!sk
->sk_bound_dev_if
||
272 sk
->sk_bound_dev_if
== skb
->dev
->ifindex
)) {
274 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
276 rawv6_rcv(last
, skb2
);
283 rawv6_rcv(last
, skb
);
284 read_unlock(&ip6_ra_lock
);
287 read_unlock(&ip6_ra_lock
);
291 static int ip6_forward_proxy_check(struct sk_buff
*skb
)
293 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
294 u8 nexthdr
= hdr
->nexthdr
;
298 if (ipv6_ext_hdr(nexthdr
)) {
299 offset
= ipv6_skip_exthdr(skb
, sizeof(*hdr
), &nexthdr
, &frag_off
);
303 offset
= sizeof(struct ipv6hdr
);
305 if (nexthdr
== IPPROTO_ICMPV6
) {
306 struct icmp6hdr
*icmp6
;
308 if (!pskb_may_pull(skb
, (skb_network_header(skb
) +
309 offset
+ 1 - skb
->data
)))
312 icmp6
= (struct icmp6hdr
*)(skb_network_header(skb
) + offset
);
314 switch (icmp6
->icmp6_type
) {
315 case NDISC_ROUTER_SOLICITATION
:
316 case NDISC_ROUTER_ADVERTISEMENT
:
317 case NDISC_NEIGHBOUR_SOLICITATION
:
318 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
320 /* For reaction involving unicast neighbor discovery
321 * message destined to the proxied address, pass it to
331 * The proxying router can't forward traffic sent to a link-local
332 * address, so signal the sender and discard the packet. This
333 * behavior is clarified by the MIPv6 specification.
335 if (ipv6_addr_type(&hdr
->daddr
) & IPV6_ADDR_LINKLOCAL
) {
336 dst_link_failure(skb
);
343 static inline int ip6_forward_finish(struct sk_buff
*skb
)
345 return dst_output(skb
);
348 static bool ip6_pkt_too_big(const struct sk_buff
*skb
, unsigned int mtu
)
353 /* ipv6 conntrack defrag sets max_frag_size + local_df */
354 if (IP6CB(skb
)->frag_max_size
&& IP6CB(skb
)->frag_max_size
> mtu
)
360 if (skb_is_gso(skb
) && skb_gso_network_seglen(skb
) <= mtu
)
366 int ip6_forward(struct sk_buff
*skb
)
368 struct dst_entry
*dst
= skb_dst(skb
);
369 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
370 struct inet6_skb_parm
*opt
= IP6CB(skb
);
371 struct net
*net
= dev_net(dst
->dev
);
374 if (net
->ipv6
.devconf_all
->forwarding
== 0)
377 if (skb_warn_if_lro(skb
))
380 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_FWD
, skb
)) {
381 IP6_INC_STATS(net
, ip6_dst_idev(dst
), IPSTATS_MIB_INDISCARDS
);
385 if (skb
->pkt_type
!= PACKET_HOST
)
388 skb_forward_csum(skb
);
391 * We DO NOT make any processing on
392 * RA packets, pushing them to user level AS IS
393 * without ane WARRANTY that application will be able
394 * to interpret them. The reason is that we
395 * cannot make anything clever here.
397 * We are not end-node, so that if packet contains
398 * AH/ESP, we cannot make anything.
399 * Defragmentation also would be mistake, RA packets
400 * cannot be fragmented, because there is no warranty
401 * that different fragments will go along one path. --ANK
403 if (unlikely(opt
->flags
& IP6SKB_ROUTERALERT
)) {
404 if (ip6_call_ra_chain(skb
, ntohs(opt
->ra
)))
409 * check and decrement ttl
411 if (hdr
->hop_limit
<= 1) {
412 /* Force OUTPUT device used as source address */
414 icmpv6_send(skb
, ICMPV6_TIME_EXCEED
, ICMPV6_EXC_HOPLIMIT
, 0);
415 IP6_INC_STATS_BH(net
,
416 ip6_dst_idev(dst
), IPSTATS_MIB_INHDRERRORS
);
422 /* XXX: idev->cnf.proxy_ndp? */
423 if (net
->ipv6
.devconf_all
->proxy_ndp
&&
424 pneigh_lookup(&nd_tbl
, net
, &hdr
->daddr
, skb
->dev
, 0)) {
425 int proxied
= ip6_forward_proxy_check(skb
);
427 return ip6_input(skb
);
428 else if (proxied
< 0) {
429 IP6_INC_STATS(net
, ip6_dst_idev(dst
),
430 IPSTATS_MIB_INDISCARDS
);
435 if (!xfrm6_route_forward(skb
)) {
436 IP6_INC_STATS(net
, ip6_dst_idev(dst
), IPSTATS_MIB_INDISCARDS
);
441 /* IPv6 specs say nothing about it, but it is clear that we cannot
442 send redirects to source routed frames.
443 We don't send redirects to frames decapsulated from IPsec.
445 if (skb
->dev
== dst
->dev
&& opt
->srcrt
== 0 && !skb_sec_path(skb
)) {
446 struct in6_addr
*target
= NULL
;
447 struct inet_peer
*peer
;
451 * incoming and outgoing devices are the same
455 rt
= (struct rt6_info
*) dst
;
456 if (rt
->rt6i_flags
& RTF_GATEWAY
)
457 target
= &rt
->rt6i_gateway
;
459 target
= &hdr
->daddr
;
461 peer
= inet_getpeer_v6(net
->ipv6
.peers
, &rt
->rt6i_dst
.addr
, 1);
463 /* Limit redirects both by destination (here)
464 and by source (inside ndisc_send_redirect)
466 if (inet_peer_xrlim_allow(peer
, 1*HZ
))
467 ndisc_send_redirect(skb
, target
);
471 int addrtype
= ipv6_addr_type(&hdr
->saddr
);
473 /* This check is security critical. */
474 if (addrtype
== IPV6_ADDR_ANY
||
475 addrtype
& (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LOOPBACK
))
477 if (addrtype
& IPV6_ADDR_LINKLOCAL
) {
478 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
,
479 ICMPV6_NOT_NEIGHBOUR
, 0);
485 if (mtu
< IPV6_MIN_MTU
)
488 if (ip6_pkt_too_big(skb
, mtu
)) {
489 /* Again, force OUTPUT device used as source address */
491 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
492 IP6_INC_STATS_BH(net
,
493 ip6_dst_idev(dst
), IPSTATS_MIB_INTOOBIGERRORS
);
494 IP6_INC_STATS_BH(net
,
495 ip6_dst_idev(dst
), IPSTATS_MIB_FRAGFAILS
);
500 if (skb_cow(skb
, dst
->dev
->hard_header_len
)) {
501 IP6_INC_STATS(net
, ip6_dst_idev(dst
), 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 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
538 to
->nf_trace
= from
->nf_trace
;
540 skb_copy_secmark(to
, from
);
543 static void ipv6_select_ident(struct frag_hdr
*fhdr
, struct rt6_info
*rt
)
545 static u32 ip6_idents_hashrnd __read_mostly
;
546 static bool hashrnd_initialized
= false;
549 if (unlikely(!hashrnd_initialized
)) {
550 hashrnd_initialized
= true;
551 get_random_bytes(&ip6_idents_hashrnd
, sizeof(ip6_idents_hashrnd
));
553 hash
= __ipv6_addr_jhash(&rt
->rt6i_dst
.addr
, ip6_idents_hashrnd
);
554 hash
= __ipv6_addr_jhash(&rt
->rt6i_src
.addr
, hash
);
556 id
= ip_idents_reserve(hash
, 1);
557 fhdr
->identification
= htonl(id
);
560 int ip6_fragment(struct sk_buff
*skb
, int (*output
)(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
? inet6_sk(skb
->sk
) : NULL
;
565 struct ipv6hdr
*tmp_hdr
;
567 unsigned int mtu
, hlen
, left
, len
;
570 int ptr
, offset
= 0, err
=0;
571 u8
*prevhdr
, nexthdr
= 0;
572 struct net
*net
= dev_net(skb_dst(skb
)->dev
);
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
->local_df
&& skb
->len
> mtu
) ||
583 (IP6CB(skb
)->frag_max_size
&&
584 IP6CB(skb
)->frag_max_size
> mtu
)) {
585 if (skb
->sk
&& dst_allfrag(skb_dst(skb
)))
586 sk_nocaps_add(skb
->sk
, NETIF_F_GSO_MASK
);
588 skb
->dev
= skb_dst(skb
)->dev
;
589 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
590 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
591 IPSTATS_MIB_FRAGFAILS
);
596 if (np
&& np
->frag_size
< mtu
) {
600 mtu
-= hlen
+ sizeof(struct frag_hdr
);
602 if (skb_has_frag_list(skb
)) {
603 int first_len
= skb_pagelen(skb
);
604 struct sk_buff
*frag2
;
606 if (first_len
- hlen
> mtu
||
607 ((first_len
- hlen
) & 7) ||
611 skb_walk_frags(skb
, frag
) {
612 /* Correct geometry. */
613 if (frag
->len
> mtu
||
614 ((frag
->len
& 7) && frag
->next
) ||
615 skb_headroom(frag
) < hlen
)
616 goto slow_path_clean
;
618 /* Partially cloned skb? */
619 if (skb_shared(frag
))
620 goto slow_path_clean
;
625 frag
->destructor
= sock_wfree
;
627 skb
->truesize
-= frag
->truesize
;
632 frag
= skb_shinfo(skb
)->frag_list
;
633 skb_frag_list_init(skb
);
636 *prevhdr
= NEXTHDR_FRAGMENT
;
637 tmp_hdr
= kmemdup(skb_network_header(skb
), hlen
, GFP_ATOMIC
);
639 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
640 IPSTATS_MIB_FRAGFAILS
);
644 __skb_pull(skb
, hlen
);
645 fh
= (struct frag_hdr
*)__skb_push(skb
, sizeof(struct frag_hdr
));
646 __skb_push(skb
, hlen
);
647 skb_reset_network_header(skb
);
648 memcpy(skb_network_header(skb
), tmp_hdr
, hlen
);
650 ipv6_select_ident(fh
, rt
);
651 fh
->nexthdr
= nexthdr
;
653 fh
->frag_off
= htons(IP6_MF
);
654 frag_id
= fh
->identification
;
656 first_len
= skb_pagelen(skb
);
657 skb
->data_len
= first_len
- skb_headlen(skb
);
658 skb
->len
= first_len
;
659 ipv6_hdr(skb
)->payload_len
= htons(first_len
-
660 sizeof(struct ipv6hdr
));
665 /* Prepare header of the next frame,
666 * before previous one went down. */
668 frag
->ip_summed
= CHECKSUM_NONE
;
669 skb_reset_transport_header(frag
);
670 fh
= (struct frag_hdr
*)__skb_push(frag
, sizeof(struct frag_hdr
));
671 __skb_push(frag
, hlen
);
672 skb_reset_network_header(frag
);
673 memcpy(skb_network_header(frag
), tmp_hdr
,
675 offset
+= skb
->len
- hlen
- sizeof(struct frag_hdr
);
676 fh
->nexthdr
= nexthdr
;
678 fh
->frag_off
= htons(offset
);
679 if (frag
->next
!= NULL
)
680 fh
->frag_off
|= htons(IP6_MF
);
681 fh
->identification
= frag_id
;
682 ipv6_hdr(frag
)->payload_len
=
684 sizeof(struct ipv6hdr
));
685 ip6_copy_metadata(frag
, skb
);
690 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
691 IPSTATS_MIB_FRAGCREATES
);
704 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
705 IPSTATS_MIB_FRAGOKS
);
716 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
717 IPSTATS_MIB_FRAGFAILS
);
722 skb_walk_frags(skb
, frag2
) {
726 frag2
->destructor
= NULL
;
727 skb
->truesize
+= frag2
->truesize
;
732 if ((skb
->ip_summed
== CHECKSUM_PARTIAL
) &&
733 skb_checksum_help(skb
))
736 left
= skb
->len
- hlen
; /* Space per frame */
737 ptr
= hlen
; /* Where to start from */
740 * Fragment the datagram.
743 hroom
= LL_RESERVED_SPACE(rt
->dst
.dev
);
744 troom
= rt
->dst
.dev
->needed_tailroom
;
747 * Keep copying data until we run out.
750 u8
*fragnexthdr_offset
;
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 */
765 if ((frag
= alloc_skb(len
+ hlen
+ sizeof(struct frag_hdr
) +
766 hroom
+ troom
, GFP_ATOMIC
)) == NULL
) {
767 NETDEBUG(KERN_INFO
"IPv6: frag: no memory for new fragment!\n");
768 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
769 IPSTATS_MIB_FRAGFAILS
);
775 * Set up data on packet
778 ip6_copy_metadata(frag
, skb
);
779 skb_reserve(frag
, hroom
);
780 skb_put(frag
, len
+ hlen
+ sizeof(struct frag_hdr
));
781 skb_reset_network_header(frag
);
782 fh
= (struct frag_hdr
*)(skb_network_header(frag
) + hlen
);
783 frag
->transport_header
= (frag
->network_header
+ hlen
+
784 sizeof(struct frag_hdr
));
787 * Charge the memory for the fragment to any owner
791 skb_set_owner_w(frag
, skb
->sk
);
794 * Copy the packet header into the new buffer.
796 skb_copy_from_linear_data(skb
, skb_network_header(frag
), hlen
);
798 fragnexthdr_offset
= skb_network_header(frag
);
799 fragnexthdr_offset
+= prevhdr
- skb_network_header(skb
);
800 *fragnexthdr_offset
= NEXTHDR_FRAGMENT
;
803 * Build fragment header.
805 fh
->nexthdr
= nexthdr
;
808 ipv6_select_ident(fh
, rt
);
809 frag_id
= fh
->identification
;
811 fh
->identification
= frag_id
;
814 * Copy a block of the IP datagram.
816 if (skb_copy_bits(skb
, ptr
, skb_transport_header(frag
), len
))
820 fh
->frag_off
= htons(offset
);
822 fh
->frag_off
|= htons(IP6_MF
);
823 ipv6_hdr(frag
)->payload_len
= htons(frag
->len
-
824 sizeof(struct ipv6hdr
));
830 * Put this fragment into the sending queue.
836 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
837 IPSTATS_MIB_FRAGCREATES
);
839 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
840 IPSTATS_MIB_FRAGOKS
);
845 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
846 IPSTATS_MIB_FRAGFAILS
);
851 static inline int ip6_rt_check(const struct rt6key
*rt_key
,
852 const struct in6_addr
*fl_addr
,
853 const struct in6_addr
*addr_cache
)
855 return (rt_key
->plen
!= 128 || !ipv6_addr_equal(fl_addr
, &rt_key
->addr
)) &&
856 (addr_cache
== NULL
|| !ipv6_addr_equal(fl_addr
, addr_cache
));
859 static struct dst_entry
*ip6_sk_dst_check(struct sock
*sk
,
860 struct dst_entry
*dst
,
861 const struct flowi6
*fl6
)
863 struct ipv6_pinfo
*np
= inet6_sk(sk
);
869 if (dst
->ops
->family
!= AF_INET6
) {
874 rt
= (struct rt6_info
*)dst
;
875 /* Yes, checking route validity in not connected
876 * case is not very simple. Take into account,
877 * that we do not support routing by source, TOS,
878 * and MSG_DONTROUTE --ANK (980726)
880 * 1. ip6_rt_check(): If route was host route,
881 * check that cached destination is current.
882 * If it is network route, we still may
883 * check its validity using saved pointer
884 * to the last used address: daddr_cache.
885 * We do not want to save whole address now,
886 * (because main consumer of this service
887 * is tcp, which has not this problem),
888 * so that the last trick works only on connected
890 * 2. oif also should be the same.
892 if (ip6_rt_check(&rt
->rt6i_dst
, &fl6
->daddr
, np
->daddr_cache
) ||
893 #ifdef CONFIG_IPV6_SUBTREES
894 ip6_rt_check(&rt
->rt6i_src
, &fl6
->saddr
, np
->saddr_cache
) ||
896 (fl6
->flowi6_oif
&& fl6
->flowi6_oif
!= dst
->dev
->ifindex
)) {
905 static int ip6_dst_lookup_tail(struct sock
*sk
,
906 struct dst_entry
**dst
, struct flowi6
*fl6
)
908 struct net
*net
= sock_net(sk
);
909 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
916 *dst
= ip6_route_output(net
, sk
, fl6
);
918 if ((err
= (*dst
)->error
))
919 goto out_err_release
;
921 if (ipv6_addr_any(&fl6
->saddr
)) {
922 struct rt6_info
*rt
= (struct rt6_info
*) *dst
;
923 err
= ip6_route_get_saddr(net
, rt
, &fl6
->daddr
,
924 sk
? inet6_sk(sk
)->srcprefs
: 0,
927 goto out_err_release
;
930 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
932 * Here if the dst entry we've looked up
933 * has a neighbour entry that is in the INCOMPLETE
934 * state and the src address from the flow is
935 * marked as OPTIMISTIC, we release the found
936 * dst entry and replace it instead with the
937 * dst entry of the nexthop router
939 rt
= (struct rt6_info
*) *dst
;
941 n
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, rt6_nexthop(rt
));
942 err
= n
&& !(n
->nud_state
& NUD_VALID
) ? -EINVAL
: 0;
943 rcu_read_unlock_bh();
946 struct inet6_ifaddr
*ifp
;
947 struct flowi6 fl_gw6
;
950 ifp
= ipv6_get_ifaddr(net
, &fl6
->saddr
,
953 redirect
= (ifp
&& ifp
->flags
& IFA_F_OPTIMISTIC
);
959 * We need to get the dst entry for the
960 * default router instead
963 memcpy(&fl_gw6
, fl6
, sizeof(struct flowi6
));
964 memset(&fl_gw6
.daddr
, 0, sizeof(struct in6_addr
));
965 *dst
= ip6_route_output(net
, sk
, &fl_gw6
);
966 if ((err
= (*dst
)->error
))
967 goto out_err_release
;
975 if (err
== -ENETUNREACH
)
976 IP6_INC_STATS_BH(net
, NULL
, IPSTATS_MIB_OUTNOROUTES
);
983 * ip6_dst_lookup - perform route lookup on flow
984 * @sk: socket which provides route info
985 * @dst: pointer to dst_entry * for result
986 * @fl6: flow to lookup
988 * This function performs a route lookup on the given flow.
990 * It returns zero on success, or a standard errno code on error.
992 int ip6_dst_lookup(struct sock
*sk
, struct dst_entry
**dst
, struct flowi6
*fl6
)
995 return ip6_dst_lookup_tail(sk
, dst
, fl6
);
997 EXPORT_SYMBOL_GPL(ip6_dst_lookup
);
1000 * ip6_dst_lookup_flow - perform route lookup on flow with ipsec
1001 * @sk: socket which provides route info
1002 * @fl6: flow to lookup
1003 * @final_dst: final destination address for ipsec lookup
1004 * @can_sleep: we are in a sleepable context
1006 * This function performs a route lookup on the given flow.
1008 * It returns a valid dst pointer on success, or a pointer encoded
1011 struct dst_entry
*ip6_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
1012 const struct in6_addr
*final_dst
,
1015 struct dst_entry
*dst
= NULL
;
1018 err
= ip6_dst_lookup_tail(sk
, &dst
, fl6
);
1020 return ERR_PTR(err
);
1022 fl6
->daddr
= *final_dst
;
1024 fl6
->flowi6_flags
|= FLOWI_FLAG_CAN_SLEEP
;
1026 return xfrm_lookup(sock_net(sk
), dst
, flowi6_to_flowi(fl6
), sk
, 0);
1028 EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow
);
1031 * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow
1032 * @sk: socket which provides the dst cache and route info
1033 * @fl6: flow to lookup
1034 * @final_dst: final destination address for ipsec lookup
1035 * @can_sleep: we are in a sleepable context
1037 * This function performs a route lookup on the given flow with the
1038 * possibility of using the cached route in the socket if it is valid.
1039 * It will take the socket dst lock when operating on the dst cache.
1040 * As a result, this function can only be used in process context.
1042 * It returns a valid dst pointer on success, or a pointer encoded
1045 struct dst_entry
*ip6_sk_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
1046 const struct in6_addr
*final_dst
,
1049 struct dst_entry
*dst
= sk_dst_check(sk
, inet6_sk(sk
)->dst_cookie
);
1052 dst
= ip6_sk_dst_check(sk
, dst
, fl6
);
1054 err
= ip6_dst_lookup_tail(sk
, &dst
, fl6
);
1056 return ERR_PTR(err
);
1058 fl6
->daddr
= *final_dst
;
1060 fl6
->flowi6_flags
|= FLOWI_FLAG_CAN_SLEEP
;
1062 return xfrm_lookup(sock_net(sk
), dst
, flowi6_to_flowi(fl6
), sk
, 0);
1064 EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow
);
1066 static inline int ip6_ufo_append_data(struct sock
*sk
,
1067 int getfrag(void *from
, char *to
, int offset
, int len
,
1068 int odd
, struct sk_buff
*skb
),
1069 void *from
, int length
, int hh_len
, int fragheaderlen
,
1070 int transhdrlen
, int mtu
,unsigned int flags
,
1071 struct rt6_info
*rt
)
1074 struct sk_buff
*skb
;
1077 /* There is support for UDP large send offload by network
1078 * device, so create one single skb packet containing complete
1081 if ((skb
= skb_peek_tail(&sk
->sk_write_queue
)) == NULL
) {
1082 struct frag_hdr fhdr
;
1084 skb
= sock_alloc_send_skb(sk
,
1085 hh_len
+ fragheaderlen
+ transhdrlen
+ 20,
1086 (flags
& MSG_DONTWAIT
), &err
);
1090 /* reserve space for Hardware header */
1091 skb_reserve(skb
, hh_len
);
1093 /* create space for UDP/IP header */
1094 skb_put(skb
,fragheaderlen
+ transhdrlen
);
1096 /* initialize network header pointer */
1097 skb_reset_network_header(skb
);
1099 /* initialize protocol header pointer */
1100 skb
->transport_header
= skb
->network_header
+ fragheaderlen
;
1102 skb
->ip_summed
= CHECKSUM_PARTIAL
;
1105 /* Specify the length of each IPv6 datagram fragment.
1106 * It has to be a multiple of 8.
1108 skb_shinfo(skb
)->gso_size
= (mtu
- fragheaderlen
-
1109 sizeof(struct frag_hdr
)) & ~7;
1110 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
1111 ipv6_select_ident(&fhdr
, rt
);
1112 skb_shinfo(skb
)->ip6_frag_id
= fhdr
.identification
;
1113 __skb_queue_tail(&sk
->sk_write_queue
, skb
);
1116 return skb_append_datato_frags(sk
, skb
, getfrag
, from
,
1117 (length
- transhdrlen
));
1120 static inline struct ipv6_opt_hdr
*ip6_opt_dup(struct ipv6_opt_hdr
*src
,
1123 return src
? kmemdup(src
, (src
->hdrlen
+ 1) * 8, gfp
) : NULL
;
1126 static inline struct ipv6_rt_hdr
*ip6_rthdr_dup(struct ipv6_rt_hdr
*src
,
1129 return src
? kmemdup(src
, (src
->hdrlen
+ 1) * 8, gfp
) : NULL
;
1132 static void ip6_append_data_mtu(unsigned int *mtu
,
1134 unsigned int fragheaderlen
,
1135 struct sk_buff
*skb
,
1136 struct rt6_info
*rt
,
1137 unsigned int orig_mtu
)
1139 if (!(rt
->dst
.flags
& DST_XFRM_TUNNEL
)) {
1141 /* first fragment, reserve header_len */
1142 *mtu
= orig_mtu
- rt
->dst
.header_len
;
1146 * this fragment is not first, the headers
1147 * space is regarded as data space.
1151 *maxfraglen
= ((*mtu
- fragheaderlen
) & ~7)
1152 + fragheaderlen
- sizeof(struct frag_hdr
);
1156 int ip6_append_data(struct sock
*sk
, int getfrag(void *from
, char *to
,
1157 int offset
, int len
, int odd
, struct sk_buff
*skb
),
1158 void *from
, int length
, int transhdrlen
,
1159 int hlimit
, int tclass
, struct ipv6_txoptions
*opt
, struct flowi6
*fl6
,
1160 struct rt6_info
*rt
, unsigned int flags
, int dontfrag
)
1162 struct inet_sock
*inet
= inet_sk(sk
);
1163 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1164 struct inet_cork
*cork
;
1165 struct sk_buff
*skb
, *skb_prev
= NULL
;
1166 unsigned int maxfraglen
, fragheaderlen
, mtu
, orig_mtu
;
1175 if (flags
&MSG_PROBE
)
1177 cork
= &inet
->cork
.base
;
1178 if (skb_queue_empty(&sk
->sk_write_queue
)) {
1183 if (WARN_ON(np
->cork
.opt
))
1186 np
->cork
.opt
= kzalloc(opt
->tot_len
, sk
->sk_allocation
);
1187 if (unlikely(np
->cork
.opt
== NULL
))
1190 np
->cork
.opt
->tot_len
= opt
->tot_len
;
1191 np
->cork
.opt
->opt_flen
= opt
->opt_flen
;
1192 np
->cork
.opt
->opt_nflen
= opt
->opt_nflen
;
1194 np
->cork
.opt
->dst0opt
= ip6_opt_dup(opt
->dst0opt
,
1196 if (opt
->dst0opt
&& !np
->cork
.opt
->dst0opt
)
1199 np
->cork
.opt
->dst1opt
= ip6_opt_dup(opt
->dst1opt
,
1201 if (opt
->dst1opt
&& !np
->cork
.opt
->dst1opt
)
1204 np
->cork
.opt
->hopopt
= ip6_opt_dup(opt
->hopopt
,
1206 if (opt
->hopopt
&& !np
->cork
.opt
->hopopt
)
1209 np
->cork
.opt
->srcrt
= ip6_rthdr_dup(opt
->srcrt
,
1211 if (opt
->srcrt
&& !np
->cork
.opt
->srcrt
)
1214 /* need source address above miyazawa*/
1217 cork
->dst
= &rt
->dst
;
1218 inet
->cork
.fl
.u
.ip6
= *fl6
;
1219 np
->cork
.hop_limit
= hlimit
;
1220 np
->cork
.tclass
= tclass
;
1221 if (rt
->dst
.flags
& DST_XFRM_TUNNEL
)
1222 mtu
= np
->pmtudisc
== IPV6_PMTUDISC_PROBE
?
1223 rt
->dst
.dev
->mtu
: dst_mtu(&rt
->dst
);
1225 mtu
= np
->pmtudisc
== IPV6_PMTUDISC_PROBE
?
1226 rt
->dst
.dev
->mtu
: dst_mtu(rt
->dst
.path
);
1227 if (np
->frag_size
< mtu
) {
1229 mtu
= np
->frag_size
;
1231 cork
->fragsize
= mtu
;
1232 if (dst_allfrag(rt
->dst
.path
))
1233 cork
->flags
|= IPCORK_ALLFRAG
;
1235 exthdrlen
= (opt
? opt
->opt_flen
: 0);
1236 length
+= exthdrlen
;
1237 transhdrlen
+= exthdrlen
;
1238 dst_exthdrlen
= rt
->dst
.header_len
- rt
->rt6i_nfheader_len
;
1240 rt
= (struct rt6_info
*)cork
->dst
;
1241 fl6
= &inet
->cork
.fl
.u
.ip6
;
1246 mtu
= cork
->fragsize
;
1250 hh_len
= LL_RESERVED_SPACE(rt
->dst
.dev
);
1252 fragheaderlen
= sizeof(struct ipv6hdr
) + rt
->rt6i_nfheader_len
+
1253 (opt
? opt
->opt_nflen
: 0);
1254 maxfraglen
= ((mtu
- fragheaderlen
) & ~7) + fragheaderlen
- sizeof(struct frag_hdr
);
1256 if (mtu
<= sizeof(struct ipv6hdr
) + IPV6_MAXPLEN
) {
1257 if (cork
->length
+ length
> sizeof(struct ipv6hdr
) + IPV6_MAXPLEN
- fragheaderlen
) {
1258 ipv6_local_error(sk
, EMSGSIZE
, fl6
, mtu
-exthdrlen
);
1263 /* For UDP, check if TX timestamp is enabled */
1264 if (sk
->sk_type
== SOCK_DGRAM
)
1265 sock_tx_timestamp(sk
, &tx_flags
);
1268 * Let's try using as much space as possible.
1269 * Use MTU if total length of the message fits into the MTU.
1270 * Otherwise, we need to reserve fragment header and
1271 * fragment alignment (= 8-15 octects, in total).
1273 * Note that we may need to "move" the data from the tail of
1274 * of the buffer to the new fragment when we split
1277 * FIXME: It may be fragmented into multiple chunks
1278 * at once if non-fragmentable extension headers
1283 if ((length
> mtu
) && dontfrag
&& (sk
->sk_protocol
== IPPROTO_UDP
||
1284 sk
->sk_protocol
== IPPROTO_RAW
)) {
1285 ipv6_local_rxpmtu(sk
, fl6
, mtu
-exthdrlen
);
1289 skb
= skb_peek_tail(&sk
->sk_write_queue
);
1290 cork
->length
+= length
;
1291 if ((skb
&& skb_has_frags(skb
)) ||
1292 (((length
+ fragheaderlen
) > mtu
) &&
1293 (skb_queue_len(&sk
->sk_write_queue
) <= 1) &&
1294 (sk
->sk_protocol
== IPPROTO_UDP
) &&
1295 (rt
->dst
.dev
->features
& NETIF_F_UFO
) &&
1296 (sk
->sk_type
== SOCK_DGRAM
))) {
1297 err
= ip6_ufo_append_data(sk
, getfrag
, from
, length
,
1298 hh_len
, fragheaderlen
,
1299 transhdrlen
, mtu
, flags
, rt
);
1308 while (length
> 0) {
1309 /* Check if the remaining data fits into current packet. */
1310 copy
= (cork
->length
<= mtu
&& !(cork
->flags
& IPCORK_ALLFRAG
) ? mtu
: maxfraglen
) - skb
->len
;
1312 copy
= maxfraglen
- skb
->len
;
1316 unsigned int datalen
;
1317 unsigned int fraglen
;
1318 unsigned int fraggap
;
1319 unsigned int alloclen
;
1321 /* There's no room in the current skb */
1323 fraggap
= skb
->len
- maxfraglen
;
1326 /* update mtu and maxfraglen if necessary */
1327 if (skb
== NULL
|| skb_prev
== NULL
)
1328 ip6_append_data_mtu(&mtu
, &maxfraglen
,
1329 fragheaderlen
, skb
, rt
,
1335 * If remaining data exceeds the mtu,
1336 * we know we need more fragment(s).
1338 datalen
= length
+ fraggap
;
1340 if (datalen
> (cork
->length
<= mtu
&& !(cork
->flags
& IPCORK_ALLFRAG
) ? mtu
: maxfraglen
) - fragheaderlen
)
1341 datalen
= maxfraglen
- fragheaderlen
- rt
->dst
.trailer_len
;
1342 if ((flags
& MSG_MORE
) &&
1343 !(rt
->dst
.dev
->features
&NETIF_F_SG
))
1346 alloclen
= datalen
+ fragheaderlen
;
1348 alloclen
+= dst_exthdrlen
;
1350 if (datalen
!= length
+ fraggap
) {
1352 * this is not the last fragment, the trailer
1353 * space is regarded as data space.
1355 datalen
+= rt
->dst
.trailer_len
;
1358 alloclen
+= rt
->dst
.trailer_len
;
1359 fraglen
= datalen
+ fragheaderlen
;
1362 * We just reserve space for fragment header.
1363 * Note: this may be overallocation if the message
1364 * (without MSG_MORE) fits into the MTU.
1366 alloclen
+= sizeof(struct frag_hdr
);
1369 skb
= sock_alloc_send_skb(sk
,
1371 (flags
& MSG_DONTWAIT
), &err
);
1374 if (atomic_read(&sk
->sk_wmem_alloc
) <=
1376 skb
= sock_wmalloc(sk
,
1377 alloclen
+ hh_len
, 1,
1379 if (unlikely(skb
== NULL
))
1382 /* Only the initial fragment
1391 * Fill in the control structures
1393 skb
->ip_summed
= CHECKSUM_NONE
;
1395 /* reserve for fragmentation and ipsec header */
1396 skb_reserve(skb
, hh_len
+ sizeof(struct frag_hdr
) +
1399 if (sk
->sk_type
== SOCK_DGRAM
)
1400 skb_shinfo(skb
)->tx_flags
= tx_flags
;
1403 * Find where to start putting bytes
1405 data
= skb_put(skb
, fraglen
);
1406 skb_set_network_header(skb
, exthdrlen
);
1407 data
+= fragheaderlen
;
1408 skb
->transport_header
= (skb
->network_header
+
1411 skb
->csum
= skb_copy_and_csum_bits(
1412 skb_prev
, maxfraglen
,
1413 data
+ transhdrlen
, fraggap
, 0);
1414 skb_prev
->csum
= csum_sub(skb_prev
->csum
,
1417 pskb_trim_unique(skb_prev
, maxfraglen
);
1419 copy
= datalen
- transhdrlen
- fraggap
;
1425 } else if (copy
> 0 && getfrag(from
, data
+ transhdrlen
, offset
, copy
, fraggap
, skb
) < 0) {
1432 length
-= datalen
- fraggap
;
1438 * Put the packet on the pending queue
1440 __skb_queue_tail(&sk
->sk_write_queue
, skb
);
1447 if (!(rt
->dst
.dev
->features
&NETIF_F_SG
)) {
1451 if (getfrag(from
, skb_put(skb
, copy
),
1452 offset
, copy
, off
, skb
) < 0) {
1453 __skb_trim(skb
, off
);
1458 int i
= skb_shinfo(skb
)->nr_frags
;
1459 struct page_frag
*pfrag
= sk_page_frag(sk
);
1462 if (!sk_page_frag_refill(sk
, pfrag
))
1465 if (!skb_can_coalesce(skb
, i
, pfrag
->page
,
1468 if (i
== MAX_SKB_FRAGS
)
1471 __skb_fill_page_desc(skb
, i
, pfrag
->page
,
1473 skb_shinfo(skb
)->nr_frags
= ++i
;
1474 get_page(pfrag
->page
);
1476 copy
= min_t(int, copy
, pfrag
->size
- pfrag
->offset
);
1478 page_address(pfrag
->page
) + pfrag
->offset
,
1479 offset
, copy
, skb
->len
, skb
) < 0)
1482 pfrag
->offset
+= copy
;
1483 skb_frag_size_add(&skb_shinfo(skb
)->frags
[i
- 1], copy
);
1485 skb
->data_len
+= copy
;
1486 skb
->truesize
+= copy
;
1487 atomic_add(copy
, &sk
->sk_wmem_alloc
);
1498 cork
->length
-= length
;
1499 IP6_INC_STATS(sock_net(sk
), rt
->rt6i_idev
, IPSTATS_MIB_OUTDISCARDS
);
1502 EXPORT_SYMBOL_GPL(ip6_append_data
);
1504 static void ip6_cork_release(struct inet_sock
*inet
, struct ipv6_pinfo
*np
)
1507 kfree(np
->cork
.opt
->dst0opt
);
1508 kfree(np
->cork
.opt
->dst1opt
);
1509 kfree(np
->cork
.opt
->hopopt
);
1510 kfree(np
->cork
.opt
->srcrt
);
1511 kfree(np
->cork
.opt
);
1512 np
->cork
.opt
= NULL
;
1515 if (inet
->cork
.base
.dst
) {
1516 dst_release(inet
->cork
.base
.dst
);
1517 inet
->cork
.base
.dst
= NULL
;
1518 inet
->cork
.base
.flags
&= ~IPCORK_ALLFRAG
;
1520 memset(&inet
->cork
.fl
, 0, sizeof(inet
->cork
.fl
));
1523 int ip6_push_pending_frames(struct sock
*sk
)
1525 struct sk_buff
*skb
, *tmp_skb
;
1526 struct sk_buff
**tail_skb
;
1527 struct in6_addr final_dst_buf
, *final_dst
= &final_dst_buf
;
1528 struct inet_sock
*inet
= inet_sk(sk
);
1529 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1530 struct net
*net
= sock_net(sk
);
1531 struct ipv6hdr
*hdr
;
1532 struct ipv6_txoptions
*opt
= np
->cork
.opt
;
1533 struct rt6_info
*rt
= (struct rt6_info
*)inet
->cork
.base
.dst
;
1534 struct flowi6
*fl6
= &inet
->cork
.fl
.u
.ip6
;
1535 unsigned char proto
= fl6
->flowi6_proto
;
1538 if ((skb
= __skb_dequeue(&sk
->sk_write_queue
)) == NULL
)
1540 tail_skb
= &(skb_shinfo(skb
)->frag_list
);
1542 /* move skb->data to ip header from ext header */
1543 if (skb
->data
< skb_network_header(skb
))
1544 __skb_pull(skb
, skb_network_offset(skb
));
1545 while ((tmp_skb
= __skb_dequeue(&sk
->sk_write_queue
)) != NULL
) {
1546 __skb_pull(tmp_skb
, skb_network_header_len(skb
));
1547 *tail_skb
= tmp_skb
;
1548 tail_skb
= &(tmp_skb
->next
);
1549 skb
->len
+= tmp_skb
->len
;
1550 skb
->data_len
+= tmp_skb
->len
;
1551 skb
->truesize
+= tmp_skb
->truesize
;
1552 tmp_skb
->destructor
= NULL
;
1556 /* Allow local fragmentation. */
1557 if (np
->pmtudisc
< IPV6_PMTUDISC_DO
)
1560 *final_dst
= fl6
->daddr
;
1561 __skb_pull(skb
, skb_network_header_len(skb
));
1562 if (opt
&& opt
->opt_flen
)
1563 ipv6_push_frag_opts(skb
, opt
, &proto
);
1564 if (opt
&& opt
->opt_nflen
)
1565 ipv6_push_nfrag_opts(skb
, opt
, &proto
, &final_dst
);
1567 skb_push(skb
, sizeof(struct ipv6hdr
));
1568 skb_reset_network_header(skb
);
1569 hdr
= ipv6_hdr(skb
);
1571 ip6_flow_hdr(hdr
, np
->cork
.tclass
, fl6
->flowlabel
);
1572 hdr
->hop_limit
= np
->cork
.hop_limit
;
1573 hdr
->nexthdr
= proto
;
1574 hdr
->saddr
= fl6
->saddr
;
1575 hdr
->daddr
= *final_dst
;
1577 skb
->priority
= sk
->sk_priority
;
1578 skb
->mark
= sk
->sk_mark
;
1580 skb_dst_set(skb
, dst_clone(&rt
->dst
));
1581 IP6_UPD_PO_STATS(net
, rt
->rt6i_idev
, IPSTATS_MIB_OUT
, skb
->len
);
1582 if (proto
== IPPROTO_ICMPV6
) {
1583 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
1585 ICMP6MSGOUT_INC_STATS(net
, idev
, icmp6_hdr(skb
)->icmp6_type
);
1586 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTMSGS
);
1589 err
= ip6_local_out(skb
);
1592 err
= net_xmit_errno(err
);
1598 ip6_cork_release(inet
, np
);
1601 IP6_INC_STATS(net
, rt
->rt6i_idev
, IPSTATS_MIB_OUTDISCARDS
);
1604 EXPORT_SYMBOL_GPL(ip6_push_pending_frames
);
1606 void ip6_flush_pending_frames(struct sock
*sk
)
1608 struct sk_buff
*skb
;
1610 while ((skb
= __skb_dequeue_tail(&sk
->sk_write_queue
)) != NULL
) {
1612 IP6_INC_STATS(sock_net(sk
), ip6_dst_idev(skb_dst(skb
)),
1613 IPSTATS_MIB_OUTDISCARDS
);
1617 ip6_cork_release(inet_sk(sk
), inet6_sk(sk
));
1619 EXPORT_SYMBOL_GPL(ip6_flush_pending_frames
);