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 sock
*sk
, 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(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 sk
, 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 sock
*sk
, 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(sk
, skb
, ip6_finish_output2
);
132 return ip6_finish_output2(sk
, 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
, sk
, skb
,
149 !(IP6CB(skb
)->flags
& IP6SKB_REROUTED
));
153 * xmit an sk_buff (used by TCP, SCTP and DCCP)
156 int ip6_xmit(struct sock
*sk
, struct sk_buff
*skb
, struct flowi6
*fl6
,
157 struct ipv6_txoptions
*opt
, int tclass
)
159 struct net
*net
= sock_net(sk
);
160 struct ipv6_pinfo
*np
= inet6_sk(sk
);
161 struct in6_addr
*first_hop
= &fl6
->daddr
;
162 struct dst_entry
*dst
= skb_dst(skb
);
164 u8 proto
= fl6
->flowi6_proto
;
165 int seg_len
= skb
->len
;
170 unsigned int head_room
;
172 /* First: exthdrs may take lots of space (~8K for now)
173 MAX_HEADER is not enough.
175 head_room
= opt
->opt_nflen
+ opt
->opt_flen
;
176 seg_len
+= head_room
;
177 head_room
+= sizeof(struct ipv6hdr
) + LL_RESERVED_SPACE(dst
->dev
);
179 if (skb_headroom(skb
) < head_room
) {
180 struct sk_buff
*skb2
= skb_realloc_headroom(skb
, head_room
);
182 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
183 IPSTATS_MIB_OUTDISCARDS
);
189 skb_set_owner_w(skb
, sk
);
192 ipv6_push_frag_opts(skb
, opt
, &proto
);
194 ipv6_push_nfrag_opts(skb
, opt
, &proto
, &first_hop
);
197 skb_push(skb
, sizeof(struct ipv6hdr
));
198 skb_reset_network_header(skb
);
202 * Fill in the IPv6 header
205 hlimit
= np
->hop_limit
;
207 hlimit
= ip6_dst_hoplimit(dst
);
209 ip6_flow_hdr(hdr
, tclass
, ip6_make_flowlabel(net
, skb
, fl6
->flowlabel
,
212 hdr
->payload_len
= htons(seg_len
);
213 hdr
->nexthdr
= proto
;
214 hdr
->hop_limit
= hlimit
;
216 hdr
->saddr
= fl6
->saddr
;
217 hdr
->daddr
= *first_hop
;
219 skb
->protocol
= htons(ETH_P_IPV6
);
220 skb
->priority
= sk
->sk_priority
;
221 skb
->mark
= sk
->sk_mark
;
224 if ((skb
->len
<= mtu
) || skb
->ignore_df
|| skb_is_gso(skb
)) {
225 IP6_UPD_PO_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
226 IPSTATS_MIB_OUT
, skb
->len
);
227 return NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, sk
, skb
,
228 NULL
, dst
->dev
, dst_output_sk
);
232 ipv6_local_error(sk
, EMSGSIZE
, fl6
, mtu
);
233 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)), IPSTATS_MIB_FRAGFAILS
);
237 EXPORT_SYMBOL(ip6_xmit
);
239 static int ip6_call_ra_chain(struct sk_buff
*skb
, int sel
)
241 struct ip6_ra_chain
*ra
;
242 struct sock
*last
= NULL
;
244 read_lock(&ip6_ra_lock
);
245 for (ra
= ip6_ra_chain
; ra
; ra
= ra
->next
) {
246 struct sock
*sk
= ra
->sk
;
247 if (sk
&& ra
->sel
== sel
&&
248 (!sk
->sk_bound_dev_if
||
249 sk
->sk_bound_dev_if
== skb
->dev
->ifindex
)) {
251 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
253 rawv6_rcv(last
, skb2
);
260 rawv6_rcv(last
, skb
);
261 read_unlock(&ip6_ra_lock
);
264 read_unlock(&ip6_ra_lock
);
268 static int ip6_forward_proxy_check(struct sk_buff
*skb
)
270 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
271 u8 nexthdr
= hdr
->nexthdr
;
275 if (ipv6_ext_hdr(nexthdr
)) {
276 offset
= ipv6_skip_exthdr(skb
, sizeof(*hdr
), &nexthdr
, &frag_off
);
280 offset
= sizeof(struct ipv6hdr
);
282 if (nexthdr
== IPPROTO_ICMPV6
) {
283 struct icmp6hdr
*icmp6
;
285 if (!pskb_may_pull(skb
, (skb_network_header(skb
) +
286 offset
+ 1 - skb
->data
)))
289 icmp6
= (struct icmp6hdr
*)(skb_network_header(skb
) + offset
);
291 switch (icmp6
->icmp6_type
) {
292 case NDISC_ROUTER_SOLICITATION
:
293 case NDISC_ROUTER_ADVERTISEMENT
:
294 case NDISC_NEIGHBOUR_SOLICITATION
:
295 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
297 /* For reaction involving unicast neighbor discovery
298 * message destined to the proxied address, pass it to
308 * The proxying router can't forward traffic sent to a link-local
309 * address, so signal the sender and discard the packet. This
310 * behavior is clarified by the MIPv6 specification.
312 if (ipv6_addr_type(&hdr
->daddr
) & IPV6_ADDR_LINKLOCAL
) {
313 dst_link_failure(skb
);
320 static inline int ip6_forward_finish(struct sock
*sk
, struct sk_buff
*skb
)
322 skb_sender_cpu_clear(skb
);
323 return dst_output_sk(sk
, skb
);
326 static unsigned int ip6_dst_mtu_forward(const struct dst_entry
*dst
)
329 struct inet6_dev
*idev
;
331 if (dst_metric_locked(dst
, RTAX_MTU
)) {
332 mtu
= dst_metric_raw(dst
, RTAX_MTU
);
339 idev
= __in6_dev_get(dst
->dev
);
341 mtu
= idev
->cnf
.mtu6
;
347 static bool ip6_pkt_too_big(const struct sk_buff
*skb
, unsigned int mtu
)
352 /* ipv6 conntrack defrag sets max_frag_size + ignore_df */
353 if (IP6CB(skb
)->frag_max_size
&& IP6CB(skb
)->frag_max_size
> mtu
)
359 if (skb_is_gso(skb
) && skb_gso_network_seglen(skb
) <= mtu
)
365 int ip6_forward(struct sk_buff
*skb
)
367 struct dst_entry
*dst
= skb_dst(skb
);
368 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
369 struct inet6_skb_parm
*opt
= IP6CB(skb
);
370 struct net
*net
= dev_net(dst
->dev
);
373 if (net
->ipv6
.devconf_all
->forwarding
== 0)
376 if (skb
->pkt_type
!= PACKET_HOST
)
379 if (skb_warn_if_lro(skb
))
382 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_FWD
, skb
)) {
383 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
384 IPSTATS_MIB_INDISCARDS
);
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
, ip6_dst_idev(dst
),
416 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_BH(net
, ip6_dst_idev(dst
),
430 IPSTATS_MIB_INDISCARDS
);
435 if (!xfrm6_route_forward(skb
)) {
436 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
437 IPSTATS_MIB_INDISCARDS
);
442 /* IPv6 specs say nothing about it, but it is clear that we cannot
443 send redirects to source routed frames.
444 We don't send redirects to frames decapsulated from IPsec.
446 if (skb
->dev
== dst
->dev
&& opt
->srcrt
== 0 && !skb_sec_path(skb
)) {
447 struct in6_addr
*target
= NULL
;
448 struct inet_peer
*peer
;
452 * incoming and outgoing devices are the same
456 rt
= (struct rt6_info
*) dst
;
457 if (rt
->rt6i_flags
& RTF_GATEWAY
)
458 target
= &rt
->rt6i_gateway
;
460 target
= &hdr
->daddr
;
462 peer
= inet_getpeer_v6(net
->ipv6
.peers
, &rt
->rt6i_dst
.addr
, 1);
464 /* Limit redirects both by destination (here)
465 and by source (inside ndisc_send_redirect)
467 if (inet_peer_xrlim_allow(peer
, 1*HZ
))
468 ndisc_send_redirect(skb
, target
);
472 int addrtype
= ipv6_addr_type(&hdr
->saddr
);
474 /* This check is security critical. */
475 if (addrtype
== IPV6_ADDR_ANY
||
476 addrtype
& (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LOOPBACK
))
478 if (addrtype
& IPV6_ADDR_LINKLOCAL
) {
479 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
,
480 ICMPV6_NOT_NEIGHBOUR
, 0);
485 mtu
= ip6_dst_mtu_forward(dst
);
486 if (mtu
< IPV6_MIN_MTU
)
489 if (ip6_pkt_too_big(skb
, mtu
)) {
490 /* Again, force OUTPUT device used as source address */
492 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
493 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
494 IPSTATS_MIB_INTOOBIGERRORS
);
495 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
496 IPSTATS_MIB_FRAGFAILS
);
501 if (skb_cow(skb
, dst
->dev
->hard_header_len
)) {
502 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
),
503 IPSTATS_MIB_OUTDISCARDS
);
509 /* Mangling hops number delayed to point after skb COW */
513 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
), IPSTATS_MIB_OUTFORWDATAGRAMS
);
514 IP6_ADD_STATS_BH(net
, ip6_dst_idev(dst
), IPSTATS_MIB_OUTOCTETS
, skb
->len
);
515 return NF_HOOK(NFPROTO_IPV6
, NF_INET_FORWARD
, NULL
, skb
,
520 IP6_INC_STATS_BH(net
, ip6_dst_idev(dst
), IPSTATS_MIB_INADDRERRORS
);
526 static void ip6_copy_metadata(struct sk_buff
*to
, struct sk_buff
*from
)
528 to
->pkt_type
= from
->pkt_type
;
529 to
->priority
= from
->priority
;
530 to
->protocol
= from
->protocol
;
532 skb_dst_set(to
, dst_clone(skb_dst(from
)));
534 to
->mark
= from
->mark
;
536 #ifdef CONFIG_NET_SCHED
537 to
->tc_index
= from
->tc_index
;
540 skb_copy_secmark(to
, from
);
543 int ip6_fragment(struct sock
*sk
, struct sk_buff
*skb
,
544 int (*output
)(struct sock
*, struct sk_buff
*))
546 struct sk_buff
*frag
;
547 struct rt6_info
*rt
= (struct rt6_info
*)skb_dst(skb
);
548 struct ipv6_pinfo
*np
= skb
->sk
&& !dev_recursion_level() ?
549 inet6_sk(skb
->sk
) : NULL
;
550 struct ipv6hdr
*tmp_hdr
;
552 unsigned int mtu
, hlen
, left
, len
;
555 int ptr
, offset
= 0, err
= 0;
556 u8
*prevhdr
, nexthdr
= 0;
557 struct net
*net
= dev_net(skb_dst(skb
)->dev
);
559 hlen
= ip6_find_1stfragopt(skb
, &prevhdr
);
562 mtu
= ip6_skb_dst_mtu(skb
);
564 /* We must not fragment if the socket is set to force MTU discovery
565 * or if the skb it not generated by a local socket.
567 if (unlikely(!skb
->ignore_df
&& skb
->len
> mtu
) ||
568 (IP6CB(skb
)->frag_max_size
&&
569 IP6CB(skb
)->frag_max_size
> mtu
)) {
570 if (skb
->sk
&& dst_allfrag(skb_dst(skb
)))
571 sk_nocaps_add(skb
->sk
, NETIF_F_GSO_MASK
);
573 skb
->dev
= skb_dst(skb
)->dev
;
574 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
575 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
576 IPSTATS_MIB_FRAGFAILS
);
581 if (np
&& np
->frag_size
< mtu
) {
585 mtu
-= hlen
+ sizeof(struct frag_hdr
);
587 if (skb_has_frag_list(skb
)) {
588 int first_len
= skb_pagelen(skb
);
589 struct sk_buff
*frag2
;
591 if (first_len
- hlen
> mtu
||
592 ((first_len
- hlen
) & 7) ||
596 skb_walk_frags(skb
, frag
) {
597 /* Correct geometry. */
598 if (frag
->len
> mtu
||
599 ((frag
->len
& 7) && frag
->next
) ||
600 skb_headroom(frag
) < hlen
)
601 goto slow_path_clean
;
603 /* Partially cloned skb? */
604 if (skb_shared(frag
))
605 goto slow_path_clean
;
610 frag
->destructor
= sock_wfree
;
612 skb
->truesize
-= frag
->truesize
;
617 frag
= skb_shinfo(skb
)->frag_list
;
618 skb_frag_list_init(skb
);
621 *prevhdr
= NEXTHDR_FRAGMENT
;
622 tmp_hdr
= kmemdup(skb_network_header(skb
), hlen
, GFP_ATOMIC
);
624 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
625 IPSTATS_MIB_FRAGFAILS
);
629 __skb_pull(skb
, hlen
);
630 fh
= (struct frag_hdr
*)__skb_push(skb
, sizeof(struct frag_hdr
));
631 __skb_push(skb
, hlen
);
632 skb_reset_network_header(skb
);
633 memcpy(skb_network_header(skb
), tmp_hdr
, hlen
);
635 ipv6_select_ident(net
, fh
, rt
);
636 fh
->nexthdr
= nexthdr
;
638 fh
->frag_off
= htons(IP6_MF
);
639 frag_id
= fh
->identification
;
641 first_len
= skb_pagelen(skb
);
642 skb
->data_len
= first_len
- skb_headlen(skb
);
643 skb
->len
= first_len
;
644 ipv6_hdr(skb
)->payload_len
= htons(first_len
-
645 sizeof(struct ipv6hdr
));
650 /* Prepare header of the next frame,
651 * before previous one went down. */
653 frag
->ip_summed
= CHECKSUM_NONE
;
654 skb_reset_transport_header(frag
);
655 fh
= (struct frag_hdr
*)__skb_push(frag
, sizeof(struct frag_hdr
));
656 __skb_push(frag
, hlen
);
657 skb_reset_network_header(frag
);
658 memcpy(skb_network_header(frag
), tmp_hdr
,
660 offset
+= skb
->len
- hlen
- sizeof(struct frag_hdr
);
661 fh
->nexthdr
= nexthdr
;
663 fh
->frag_off
= htons(offset
);
665 fh
->frag_off
|= htons(IP6_MF
);
666 fh
->identification
= frag_id
;
667 ipv6_hdr(frag
)->payload_len
=
669 sizeof(struct ipv6hdr
));
670 ip6_copy_metadata(frag
, skb
);
673 err
= output(sk
, skb
);
675 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
676 IPSTATS_MIB_FRAGCREATES
);
689 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
690 IPSTATS_MIB_FRAGOKS
);
695 kfree_skb_list(frag
);
697 IP6_INC_STATS(net
, ip6_dst_idev(&rt
->dst
),
698 IPSTATS_MIB_FRAGFAILS
);
703 skb_walk_frags(skb
, frag2
) {
707 frag2
->destructor
= NULL
;
708 skb
->truesize
+= frag2
->truesize
;
713 if ((skb
->ip_summed
== CHECKSUM_PARTIAL
) &&
714 skb_checksum_help(skb
))
717 left
= skb
->len
- hlen
; /* Space per frame */
718 ptr
= hlen
; /* Where to start from */
721 * Fragment the datagram.
724 *prevhdr
= NEXTHDR_FRAGMENT
;
725 hroom
= LL_RESERVED_SPACE(rt
->dst
.dev
);
726 troom
= rt
->dst
.dev
->needed_tailroom
;
729 * Keep copying data until we run out.
733 /* IF: it doesn't fit, use 'mtu' - the data space left */
736 /* IF: we are not sending up to and including the packet end
737 then align the next start on an eight byte boundary */
742 /* Allocate buffer */
743 frag
= alloc_skb(len
+ hlen
+ sizeof(struct frag_hdr
) +
744 hroom
+ troom
, GFP_ATOMIC
);
746 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
747 IPSTATS_MIB_FRAGFAILS
);
753 * Set up data on packet
756 ip6_copy_metadata(frag
, skb
);
757 skb_reserve(frag
, hroom
);
758 skb_put(frag
, len
+ hlen
+ sizeof(struct frag_hdr
));
759 skb_reset_network_header(frag
);
760 fh
= (struct frag_hdr
*)(skb_network_header(frag
) + hlen
);
761 frag
->transport_header
= (frag
->network_header
+ hlen
+
762 sizeof(struct frag_hdr
));
765 * Charge the memory for the fragment to any owner
769 skb_set_owner_w(frag
, skb
->sk
);
772 * Copy the packet header into the new buffer.
774 skb_copy_from_linear_data(skb
, skb_network_header(frag
), hlen
);
777 * Build fragment header.
779 fh
->nexthdr
= nexthdr
;
782 ipv6_select_ident(net
, fh
, rt
);
783 frag_id
= fh
->identification
;
785 fh
->identification
= frag_id
;
788 * Copy a block of the IP datagram.
790 BUG_ON(skb_copy_bits(skb
, ptr
, skb_transport_header(frag
),
794 fh
->frag_off
= htons(offset
);
796 fh
->frag_off
|= htons(IP6_MF
);
797 ipv6_hdr(frag
)->payload_len
= htons(frag
->len
-
798 sizeof(struct ipv6hdr
));
804 * Put this fragment into the sending queue.
806 err
= output(sk
, frag
);
810 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
811 IPSTATS_MIB_FRAGCREATES
);
813 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
814 IPSTATS_MIB_FRAGOKS
);
819 IP6_INC_STATS(net
, ip6_dst_idev(skb_dst(skb
)),
820 IPSTATS_MIB_FRAGFAILS
);
825 static inline int ip6_rt_check(const struct rt6key
*rt_key
,
826 const struct in6_addr
*fl_addr
,
827 const struct in6_addr
*addr_cache
)
829 return (rt_key
->plen
!= 128 || !ipv6_addr_equal(fl_addr
, &rt_key
->addr
)) &&
830 (!addr_cache
|| !ipv6_addr_equal(fl_addr
, addr_cache
));
833 static struct dst_entry
*ip6_sk_dst_check(struct sock
*sk
,
834 struct dst_entry
*dst
,
835 const struct flowi6
*fl6
)
837 struct ipv6_pinfo
*np
= inet6_sk(sk
);
843 if (dst
->ops
->family
!= AF_INET6
) {
848 rt
= (struct rt6_info
*)dst
;
849 /* Yes, checking route validity in not connected
850 * case is not very simple. Take into account,
851 * that we do not support routing by source, TOS,
852 * and MSG_DONTROUTE --ANK (980726)
854 * 1. ip6_rt_check(): If route was host route,
855 * check that cached destination is current.
856 * If it is network route, we still may
857 * check its validity using saved pointer
858 * to the last used address: daddr_cache.
859 * We do not want to save whole address now,
860 * (because main consumer of this service
861 * is tcp, which has not this problem),
862 * so that the last trick works only on connected
864 * 2. oif also should be the same.
866 if (ip6_rt_check(&rt
->rt6i_dst
, &fl6
->daddr
, np
->daddr_cache
) ||
867 #ifdef CONFIG_IPV6_SUBTREES
868 ip6_rt_check(&rt
->rt6i_src
, &fl6
->saddr
, np
->saddr_cache
) ||
870 (fl6
->flowi6_oif
&& fl6
->flowi6_oif
!= dst
->dev
->ifindex
)) {
879 static int ip6_dst_lookup_tail(struct sock
*sk
,
880 struct dst_entry
**dst
, struct flowi6
*fl6
)
882 struct net
*net
= sock_net(sk
);
883 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
890 *dst
= ip6_route_output(net
, sk
, fl6
);
894 goto out_err_release
;
896 if (ipv6_addr_any(&fl6
->saddr
)) {
897 struct rt6_info
*rt
= (struct rt6_info
*) *dst
;
898 err
= ip6_route_get_saddr(net
, rt
, &fl6
->daddr
,
899 sk
? inet6_sk(sk
)->srcprefs
: 0,
902 goto out_err_release
;
905 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
907 * Here if the dst entry we've looked up
908 * has a neighbour entry that is in the INCOMPLETE
909 * state and the src address from the flow is
910 * marked as OPTIMISTIC, we release the found
911 * dst entry and replace it instead with the
912 * dst entry of the nexthop router
914 rt
= (struct rt6_info
*) *dst
;
916 n
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, rt6_nexthop(rt
));
917 err
= n
&& !(n
->nud_state
& NUD_VALID
) ? -EINVAL
: 0;
918 rcu_read_unlock_bh();
921 struct inet6_ifaddr
*ifp
;
922 struct flowi6 fl_gw6
;
925 ifp
= ipv6_get_ifaddr(net
, &fl6
->saddr
,
928 redirect
= (ifp
&& ifp
->flags
& IFA_F_OPTIMISTIC
);
934 * We need to get the dst entry for the
935 * default router instead
938 memcpy(&fl_gw6
, fl6
, sizeof(struct flowi6
));
939 memset(&fl_gw6
.daddr
, 0, sizeof(struct in6_addr
));
940 *dst
= ip6_route_output(net
, sk
, &fl_gw6
);
943 goto out_err_release
;
951 if (err
== -ENETUNREACH
)
952 IP6_INC_STATS(net
, NULL
, IPSTATS_MIB_OUTNOROUTES
);
959 * ip6_dst_lookup - perform route lookup on flow
960 * @sk: socket which provides route info
961 * @dst: pointer to dst_entry * for result
962 * @fl6: flow to lookup
964 * This function performs a route lookup on the given flow.
966 * It returns zero on success, or a standard errno code on error.
968 int ip6_dst_lookup(struct sock
*sk
, struct dst_entry
**dst
, struct flowi6
*fl6
)
971 return ip6_dst_lookup_tail(sk
, dst
, fl6
);
973 EXPORT_SYMBOL_GPL(ip6_dst_lookup
);
976 * ip6_dst_lookup_flow - perform route lookup on flow with ipsec
977 * @sk: socket which provides route info
978 * @fl6: flow to lookup
979 * @final_dst: final destination address for ipsec lookup
981 * This function performs a route lookup on the given flow.
983 * It returns a valid dst pointer on success, or a pointer encoded
986 struct dst_entry
*ip6_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
987 const struct in6_addr
*final_dst
)
989 struct dst_entry
*dst
= NULL
;
992 err
= ip6_dst_lookup_tail(sk
, &dst
, fl6
);
996 fl6
->daddr
= *final_dst
;
998 return xfrm_lookup_route(sock_net(sk
), dst
, flowi6_to_flowi(fl6
), sk
, 0);
1000 EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow
);
1003 * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow
1004 * @sk: socket which provides the dst cache and route info
1005 * @fl6: flow to lookup
1006 * @final_dst: final destination address for ipsec lookup
1008 * This function performs a route lookup on the given flow with the
1009 * possibility of using the cached route in the socket if it is valid.
1010 * It will take the socket dst lock when operating on the dst cache.
1011 * As a result, this function can only be used in process context.
1013 * It returns a valid dst pointer on success, or a pointer encoded
1016 struct dst_entry
*ip6_sk_dst_lookup_flow(struct sock
*sk
, struct flowi6
*fl6
,
1017 const struct in6_addr
*final_dst
)
1019 struct dst_entry
*dst
= sk_dst_check(sk
, inet6_sk(sk
)->dst_cookie
);
1022 dst
= ip6_sk_dst_check(sk
, dst
, fl6
);
1024 err
= ip6_dst_lookup_tail(sk
, &dst
, fl6
);
1026 return ERR_PTR(err
);
1028 fl6
->daddr
= *final_dst
;
1030 return xfrm_lookup_route(sock_net(sk
), dst
, flowi6_to_flowi(fl6
), sk
, 0);
1032 EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow
);
1034 static inline int ip6_ufo_append_data(struct sock
*sk
,
1035 struct sk_buff_head
*queue
,
1036 int getfrag(void *from
, char *to
, int offset
, int len
,
1037 int odd
, struct sk_buff
*skb
),
1038 void *from
, int length
, int hh_len
, int fragheaderlen
,
1039 int transhdrlen
, int mtu
, unsigned int flags
,
1040 struct rt6_info
*rt
)
1043 struct sk_buff
*skb
;
1044 struct frag_hdr fhdr
;
1047 /* There is support for UDP large send offload by network
1048 * device, so create one single skb packet containing complete
1051 skb
= skb_peek_tail(queue
);
1053 skb
= sock_alloc_send_skb(sk
,
1054 hh_len
+ fragheaderlen
+ transhdrlen
+ 20,
1055 (flags
& MSG_DONTWAIT
), &err
);
1059 /* reserve space for Hardware header */
1060 skb_reserve(skb
, hh_len
);
1062 /* create space for UDP/IP header */
1063 skb_put(skb
, fragheaderlen
+ transhdrlen
);
1065 /* initialize network header pointer */
1066 skb_reset_network_header(skb
);
1068 /* initialize protocol header pointer */
1069 skb
->transport_header
= skb
->network_header
+ fragheaderlen
;
1071 skb
->protocol
= htons(ETH_P_IPV6
);
1074 __skb_queue_tail(queue
, skb
);
1075 } else if (skb_is_gso(skb
)) {
1079 skb
->ip_summed
= CHECKSUM_PARTIAL
;
1080 /* Specify the length of each IPv6 datagram fragment.
1081 * It has to be a multiple of 8.
1083 skb_shinfo(skb
)->gso_size
= (mtu
- fragheaderlen
-
1084 sizeof(struct frag_hdr
)) & ~7;
1085 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
1086 ipv6_select_ident(sock_net(sk
), &fhdr
, rt
);
1087 skb_shinfo(skb
)->ip6_frag_id
= fhdr
.identification
;
1090 return skb_append_datato_frags(sk
, skb
, getfrag
, from
,
1091 (length
- transhdrlen
));
1094 static inline struct ipv6_opt_hdr
*ip6_opt_dup(struct ipv6_opt_hdr
*src
,
1097 return src
? kmemdup(src
, (src
->hdrlen
+ 1) * 8, gfp
) : NULL
;
1100 static inline struct ipv6_rt_hdr
*ip6_rthdr_dup(struct ipv6_rt_hdr
*src
,
1103 return src
? kmemdup(src
, (src
->hdrlen
+ 1) * 8, gfp
) : NULL
;
1106 static void ip6_append_data_mtu(unsigned int *mtu
,
1108 unsigned int fragheaderlen
,
1109 struct sk_buff
*skb
,
1110 struct rt6_info
*rt
,
1111 unsigned int orig_mtu
)
1113 if (!(rt
->dst
.flags
& DST_XFRM_TUNNEL
)) {
1115 /* first fragment, reserve header_len */
1116 *mtu
= orig_mtu
- rt
->dst
.header_len
;
1120 * this fragment is not first, the headers
1121 * space is regarded as data space.
1125 *maxfraglen
= ((*mtu
- fragheaderlen
) & ~7)
1126 + fragheaderlen
- sizeof(struct frag_hdr
);
1130 static int ip6_setup_cork(struct sock
*sk
, struct inet_cork_full
*cork
,
1131 struct inet6_cork
*v6_cork
,
1132 int hlimit
, int tclass
, struct ipv6_txoptions
*opt
,
1133 struct rt6_info
*rt
, struct flowi6
*fl6
)
1135 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1142 if (WARN_ON(v6_cork
->opt
))
1145 v6_cork
->opt
= kzalloc(opt
->tot_len
, sk
->sk_allocation
);
1146 if (unlikely(!v6_cork
->opt
))
1149 v6_cork
->opt
->tot_len
= opt
->tot_len
;
1150 v6_cork
->opt
->opt_flen
= opt
->opt_flen
;
1151 v6_cork
->opt
->opt_nflen
= opt
->opt_nflen
;
1153 v6_cork
->opt
->dst0opt
= ip6_opt_dup(opt
->dst0opt
,
1155 if (opt
->dst0opt
&& !v6_cork
->opt
->dst0opt
)
1158 v6_cork
->opt
->dst1opt
= ip6_opt_dup(opt
->dst1opt
,
1160 if (opt
->dst1opt
&& !v6_cork
->opt
->dst1opt
)
1163 v6_cork
->opt
->hopopt
= ip6_opt_dup(opt
->hopopt
,
1165 if (opt
->hopopt
&& !v6_cork
->opt
->hopopt
)
1168 v6_cork
->opt
->srcrt
= ip6_rthdr_dup(opt
->srcrt
,
1170 if (opt
->srcrt
&& !v6_cork
->opt
->srcrt
)
1173 /* need source address above miyazawa*/
1176 cork
->base
.dst
= &rt
->dst
;
1177 cork
->fl
.u
.ip6
= *fl6
;
1178 v6_cork
->hop_limit
= hlimit
;
1179 v6_cork
->tclass
= tclass
;
1180 if (rt
->dst
.flags
& DST_XFRM_TUNNEL
)
1181 mtu
= np
->pmtudisc
>= IPV6_PMTUDISC_PROBE
?
1182 rt
->dst
.dev
->mtu
: dst_mtu(&rt
->dst
);
1184 mtu
= np
->pmtudisc
>= IPV6_PMTUDISC_PROBE
?
1185 rt
->dst
.dev
->mtu
: dst_mtu(rt
->dst
.path
);
1186 if (np
->frag_size
< mtu
) {
1188 mtu
= np
->frag_size
;
1190 cork
->base
.fragsize
= mtu
;
1191 if (dst_allfrag(rt
->dst
.path
))
1192 cork
->base
.flags
|= IPCORK_ALLFRAG
;
1193 cork
->base
.length
= 0;
1198 static int __ip6_append_data(struct sock
*sk
,
1200 struct sk_buff_head
*queue
,
1201 struct inet_cork
*cork
,
1202 struct inet6_cork
*v6_cork
,
1203 struct page_frag
*pfrag
,
1204 int getfrag(void *from
, char *to
, int offset
,
1205 int len
, int odd
, struct sk_buff
*skb
),
1206 void *from
, int length
, int transhdrlen
,
1207 unsigned int flags
, int dontfrag
)
1209 struct sk_buff
*skb
, *skb_prev
= NULL
;
1210 unsigned int maxfraglen
, fragheaderlen
, mtu
, orig_mtu
;
1212 int dst_exthdrlen
= 0;
1219 struct rt6_info
*rt
= (struct rt6_info
*)cork
->dst
;
1220 struct ipv6_txoptions
*opt
= v6_cork
->opt
;
1221 int csummode
= CHECKSUM_NONE
;
1223 skb
= skb_peek_tail(queue
);
1225 exthdrlen
= opt
? opt
->opt_flen
: 0;
1226 dst_exthdrlen
= rt
->dst
.header_len
- rt
->rt6i_nfheader_len
;
1229 mtu
= cork
->fragsize
;
1232 hh_len
= LL_RESERVED_SPACE(rt
->dst
.dev
);
1234 fragheaderlen
= sizeof(struct ipv6hdr
) + rt
->rt6i_nfheader_len
+
1235 (opt
? opt
->opt_nflen
: 0);
1236 maxfraglen
= ((mtu
- fragheaderlen
) & ~7) + fragheaderlen
-
1237 sizeof(struct frag_hdr
);
1239 if (mtu
<= sizeof(struct ipv6hdr
) + IPV6_MAXPLEN
) {
1240 unsigned int maxnonfragsize
, headersize
;
1242 headersize
= sizeof(struct ipv6hdr
) +
1243 (opt
? opt
->opt_flen
+ opt
->opt_nflen
: 0) +
1244 (dst_allfrag(&rt
->dst
) ?
1245 sizeof(struct frag_hdr
) : 0) +
1246 rt
->rt6i_nfheader_len
;
1248 if (ip6_sk_ignore_df(sk
))
1249 maxnonfragsize
= sizeof(struct ipv6hdr
) + IPV6_MAXPLEN
;
1251 maxnonfragsize
= mtu
;
1253 /* dontfrag active */
1254 if ((cork
->length
+ length
> mtu
- headersize
) && dontfrag
&&
1255 (sk
->sk_protocol
== IPPROTO_UDP
||
1256 sk
->sk_protocol
== IPPROTO_RAW
)) {
1257 ipv6_local_rxpmtu(sk
, fl6
, mtu
- headersize
+
1258 sizeof(struct ipv6hdr
));
1262 if (cork
->length
+ length
> maxnonfragsize
- headersize
) {
1264 ipv6_local_error(sk
, EMSGSIZE
, fl6
,
1266 sizeof(struct ipv6hdr
));
1271 if (sk
->sk_type
== SOCK_DGRAM
|| sk
->sk_type
== SOCK_RAW
) {
1272 sock_tx_timestamp(sk
, &tx_flags
);
1273 if (tx_flags
& SKBTX_ANY_SW_TSTAMP
&&
1274 sk
->sk_tsflags
& SOF_TIMESTAMPING_OPT_ID
)
1275 tskey
= sk
->sk_tskey
++;
1278 /* If this is the first and only packet and device
1279 * supports checksum offloading, let's use it.
1281 if (!skb
&& sk
->sk_protocol
== IPPROTO_UDP
&&
1282 length
+ fragheaderlen
< mtu
&&
1283 rt
->dst
.dev
->features
& NETIF_F_V6_CSUM
&&
1285 csummode
= CHECKSUM_PARTIAL
;
1287 * Let's try using as much space as possible.
1288 * Use MTU if total length of the message fits into the MTU.
1289 * Otherwise, we need to reserve fragment header and
1290 * fragment alignment (= 8-15 octects, in total).
1292 * Note that we may need to "move" the data from the tail of
1293 * of the buffer to the new fragment when we split
1296 * FIXME: It may be fragmented into multiple chunks
1297 * at once if non-fragmentable extension headers
1302 cork
->length
+= length
;
1303 if (((length
> mtu
) ||
1304 (skb
&& skb_is_gso(skb
))) &&
1305 (sk
->sk_protocol
== IPPROTO_UDP
) &&
1306 (rt
->dst
.dev
->features
& NETIF_F_UFO
) &&
1307 (sk
->sk_type
== SOCK_DGRAM
)) {
1308 err
= ip6_ufo_append_data(sk
, queue
, getfrag
, from
, length
,
1309 hh_len
, fragheaderlen
,
1310 transhdrlen
, mtu
, flags
, rt
);
1319 while (length
> 0) {
1320 /* Check if the remaining data fits into current packet. */
1321 copy
= (cork
->length
<= mtu
&& !(cork
->flags
& IPCORK_ALLFRAG
) ? mtu
: maxfraglen
) - skb
->len
;
1323 copy
= maxfraglen
- skb
->len
;
1327 unsigned int datalen
;
1328 unsigned int fraglen
;
1329 unsigned int fraggap
;
1330 unsigned int alloclen
;
1332 /* There's no room in the current skb */
1334 fraggap
= skb
->len
- maxfraglen
;
1337 /* update mtu and maxfraglen if necessary */
1338 if (!skb
|| !skb_prev
)
1339 ip6_append_data_mtu(&mtu
, &maxfraglen
,
1340 fragheaderlen
, skb
, rt
,
1346 * If remaining data exceeds the mtu,
1347 * we know we need more fragment(s).
1349 datalen
= length
+ fraggap
;
1351 if (datalen
> (cork
->length
<= mtu
&& !(cork
->flags
& IPCORK_ALLFRAG
) ? mtu
: maxfraglen
) - fragheaderlen
)
1352 datalen
= maxfraglen
- fragheaderlen
- rt
->dst
.trailer_len
;
1353 if ((flags
& MSG_MORE
) &&
1354 !(rt
->dst
.dev
->features
&NETIF_F_SG
))
1357 alloclen
= datalen
+ fragheaderlen
;
1359 alloclen
+= dst_exthdrlen
;
1361 if (datalen
!= length
+ fraggap
) {
1363 * this is not the last fragment, the trailer
1364 * space is regarded as data space.
1366 datalen
+= rt
->dst
.trailer_len
;
1369 alloclen
+= rt
->dst
.trailer_len
;
1370 fraglen
= datalen
+ fragheaderlen
;
1373 * We just reserve space for fragment header.
1374 * Note: this may be overallocation if the message
1375 * (without MSG_MORE) fits into the MTU.
1377 alloclen
+= sizeof(struct frag_hdr
);
1380 skb
= sock_alloc_send_skb(sk
,
1382 (flags
& MSG_DONTWAIT
), &err
);
1385 if (atomic_read(&sk
->sk_wmem_alloc
) <=
1387 skb
= sock_wmalloc(sk
,
1388 alloclen
+ hh_len
, 1,
1396 * Fill in the control structures
1398 skb
->protocol
= htons(ETH_P_IPV6
);
1399 skb
->ip_summed
= csummode
;
1401 /* reserve for fragmentation and ipsec header */
1402 skb_reserve(skb
, hh_len
+ sizeof(struct frag_hdr
) +
1405 /* Only the initial fragment is time stamped */
1406 skb_shinfo(skb
)->tx_flags
= tx_flags
;
1408 skb_shinfo(skb
)->tskey
= tskey
;
1412 * Find where to start putting bytes
1414 data
= skb_put(skb
, fraglen
);
1415 skb_set_network_header(skb
, exthdrlen
);
1416 data
+= fragheaderlen
;
1417 skb
->transport_header
= (skb
->network_header
+
1420 skb
->csum
= skb_copy_and_csum_bits(
1421 skb_prev
, maxfraglen
,
1422 data
+ transhdrlen
, fraggap
, 0);
1423 skb_prev
->csum
= csum_sub(skb_prev
->csum
,
1426 pskb_trim_unique(skb_prev
, maxfraglen
);
1428 copy
= datalen
- transhdrlen
- fraggap
;
1434 } else if (copy
> 0 && getfrag(from
, data
+ transhdrlen
, offset
, copy
, fraggap
, skb
) < 0) {
1441 length
-= datalen
- fraggap
;
1447 * Put the packet on the pending queue
1449 __skb_queue_tail(queue
, skb
);
1456 if (!(rt
->dst
.dev
->features
&NETIF_F_SG
)) {
1460 if (getfrag(from
, skb_put(skb
, copy
),
1461 offset
, copy
, off
, skb
) < 0) {
1462 __skb_trim(skb
, off
);
1467 int i
= skb_shinfo(skb
)->nr_frags
;
1470 if (!sk_page_frag_refill(sk
, pfrag
))
1473 if (!skb_can_coalesce(skb
, i
, pfrag
->page
,
1476 if (i
== MAX_SKB_FRAGS
)
1479 __skb_fill_page_desc(skb
, i
, pfrag
->page
,
1481 skb_shinfo(skb
)->nr_frags
= ++i
;
1482 get_page(pfrag
->page
);
1484 copy
= min_t(int, copy
, pfrag
->size
- pfrag
->offset
);
1486 page_address(pfrag
->page
) + pfrag
->offset
,
1487 offset
, copy
, skb
->len
, skb
) < 0)
1490 pfrag
->offset
+= copy
;
1491 skb_frag_size_add(&skb_shinfo(skb
)->frags
[i
- 1], copy
);
1493 skb
->data_len
+= copy
;
1494 skb
->truesize
+= copy
;
1495 atomic_add(copy
, &sk
->sk_wmem_alloc
);
1506 cork
->length
-= length
;
1507 IP6_INC_STATS(sock_net(sk
), rt
->rt6i_idev
, IPSTATS_MIB_OUTDISCARDS
);
1511 int ip6_append_data(struct sock
*sk
,
1512 int getfrag(void *from
, char *to
, int offset
, int len
,
1513 int odd
, struct sk_buff
*skb
),
1514 void *from
, int length
, int transhdrlen
, int hlimit
,
1515 int tclass
, struct ipv6_txoptions
*opt
, struct flowi6
*fl6
,
1516 struct rt6_info
*rt
, unsigned int flags
, int dontfrag
)
1518 struct inet_sock
*inet
= inet_sk(sk
);
1519 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1523 if (flags
&MSG_PROBE
)
1525 if (skb_queue_empty(&sk
->sk_write_queue
)) {
1529 err
= ip6_setup_cork(sk
, &inet
->cork
, &np
->cork
, hlimit
,
1530 tclass
, opt
, rt
, fl6
);
1534 exthdrlen
= (opt
? opt
->opt_flen
: 0);
1535 length
+= exthdrlen
;
1536 transhdrlen
+= exthdrlen
;
1538 fl6
= &inet
->cork
.fl
.u
.ip6
;
1542 return __ip6_append_data(sk
, fl6
, &sk
->sk_write_queue
, &inet
->cork
.base
,
1543 &np
->cork
, sk_page_frag(sk
), getfrag
,
1544 from
, length
, transhdrlen
, flags
, dontfrag
);
1546 EXPORT_SYMBOL_GPL(ip6_append_data
);
1548 static void ip6_cork_release(struct inet_cork_full
*cork
,
1549 struct inet6_cork
*v6_cork
)
1552 kfree(v6_cork
->opt
->dst0opt
);
1553 kfree(v6_cork
->opt
->dst1opt
);
1554 kfree(v6_cork
->opt
->hopopt
);
1555 kfree(v6_cork
->opt
->srcrt
);
1556 kfree(v6_cork
->opt
);
1557 v6_cork
->opt
= NULL
;
1560 if (cork
->base
.dst
) {
1561 dst_release(cork
->base
.dst
);
1562 cork
->base
.dst
= NULL
;
1563 cork
->base
.flags
&= ~IPCORK_ALLFRAG
;
1565 memset(&cork
->fl
, 0, sizeof(cork
->fl
));
1568 struct sk_buff
*__ip6_make_skb(struct sock
*sk
,
1569 struct sk_buff_head
*queue
,
1570 struct inet_cork_full
*cork
,
1571 struct inet6_cork
*v6_cork
)
1573 struct sk_buff
*skb
, *tmp_skb
;
1574 struct sk_buff
**tail_skb
;
1575 struct in6_addr final_dst_buf
, *final_dst
= &final_dst_buf
;
1576 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1577 struct net
*net
= sock_net(sk
);
1578 struct ipv6hdr
*hdr
;
1579 struct ipv6_txoptions
*opt
= v6_cork
->opt
;
1580 struct rt6_info
*rt
= (struct rt6_info
*)cork
->base
.dst
;
1581 struct flowi6
*fl6
= &cork
->fl
.u
.ip6
;
1582 unsigned char proto
= fl6
->flowi6_proto
;
1584 skb
= __skb_dequeue(queue
);
1587 tail_skb
= &(skb_shinfo(skb
)->frag_list
);
1589 /* move skb->data to ip header from ext header */
1590 if (skb
->data
< skb_network_header(skb
))
1591 __skb_pull(skb
, skb_network_offset(skb
));
1592 while ((tmp_skb
= __skb_dequeue(queue
)) != NULL
) {
1593 __skb_pull(tmp_skb
, skb_network_header_len(skb
));
1594 *tail_skb
= tmp_skb
;
1595 tail_skb
= &(tmp_skb
->next
);
1596 skb
->len
+= tmp_skb
->len
;
1597 skb
->data_len
+= tmp_skb
->len
;
1598 skb
->truesize
+= tmp_skb
->truesize
;
1599 tmp_skb
->destructor
= NULL
;
1603 /* Allow local fragmentation. */
1604 skb
->ignore_df
= ip6_sk_ignore_df(sk
);
1606 *final_dst
= fl6
->daddr
;
1607 __skb_pull(skb
, skb_network_header_len(skb
));
1608 if (opt
&& opt
->opt_flen
)
1609 ipv6_push_frag_opts(skb
, opt
, &proto
);
1610 if (opt
&& opt
->opt_nflen
)
1611 ipv6_push_nfrag_opts(skb
, opt
, &proto
, &final_dst
);
1613 skb_push(skb
, sizeof(struct ipv6hdr
));
1614 skb_reset_network_header(skb
);
1615 hdr
= ipv6_hdr(skb
);
1617 ip6_flow_hdr(hdr
, v6_cork
->tclass
,
1618 ip6_make_flowlabel(net
, skb
, fl6
->flowlabel
,
1619 np
->autoflowlabel
));
1620 hdr
->hop_limit
= v6_cork
->hop_limit
;
1621 hdr
->nexthdr
= proto
;
1622 hdr
->saddr
= fl6
->saddr
;
1623 hdr
->daddr
= *final_dst
;
1625 skb
->priority
= sk
->sk_priority
;
1626 skb
->mark
= sk
->sk_mark
;
1628 skb_dst_set(skb
, dst_clone(&rt
->dst
));
1629 IP6_UPD_PO_STATS(net
, rt
->rt6i_idev
, IPSTATS_MIB_OUT
, skb
->len
);
1630 if (proto
== IPPROTO_ICMPV6
) {
1631 struct inet6_dev
*idev
= ip6_dst_idev(skb_dst(skb
));
1633 ICMP6MSGOUT_INC_STATS(net
, idev
, icmp6_hdr(skb
)->icmp6_type
);
1634 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTMSGS
);
1637 ip6_cork_release(cork
, v6_cork
);
1642 int ip6_send_skb(struct sk_buff
*skb
)
1644 struct net
*net
= sock_net(skb
->sk
);
1645 struct rt6_info
*rt
= (struct rt6_info
*)skb_dst(skb
);
1648 err
= ip6_local_out(skb
);
1651 err
= net_xmit_errno(err
);
1653 IP6_INC_STATS(net
, rt
->rt6i_idev
,
1654 IPSTATS_MIB_OUTDISCARDS
);
1660 int ip6_push_pending_frames(struct sock
*sk
)
1662 struct sk_buff
*skb
;
1664 skb
= ip6_finish_skb(sk
);
1668 return ip6_send_skb(skb
);
1670 EXPORT_SYMBOL_GPL(ip6_push_pending_frames
);
1672 static void __ip6_flush_pending_frames(struct sock
*sk
,
1673 struct sk_buff_head
*queue
,
1674 struct inet_cork_full
*cork
,
1675 struct inet6_cork
*v6_cork
)
1677 struct sk_buff
*skb
;
1679 while ((skb
= __skb_dequeue_tail(queue
)) != NULL
) {
1681 IP6_INC_STATS(sock_net(sk
), ip6_dst_idev(skb_dst(skb
)),
1682 IPSTATS_MIB_OUTDISCARDS
);
1686 ip6_cork_release(cork
, v6_cork
);
1689 void ip6_flush_pending_frames(struct sock
*sk
)
1691 __ip6_flush_pending_frames(sk
, &sk
->sk_write_queue
,
1692 &inet_sk(sk
)->cork
, &inet6_sk(sk
)->cork
);
1694 EXPORT_SYMBOL_GPL(ip6_flush_pending_frames
);
1696 struct sk_buff
*ip6_make_skb(struct sock
*sk
,
1697 int getfrag(void *from
, char *to
, int offset
,
1698 int len
, int odd
, struct sk_buff
*skb
),
1699 void *from
, int length
, int transhdrlen
,
1700 int hlimit
, int tclass
,
1701 struct ipv6_txoptions
*opt
, struct flowi6
*fl6
,
1702 struct rt6_info
*rt
, unsigned int flags
,
1705 struct inet_cork_full cork
;
1706 struct inet6_cork v6_cork
;
1707 struct sk_buff_head queue
;
1708 int exthdrlen
= (opt
? opt
->opt_flen
: 0);
1711 if (flags
& MSG_PROBE
)
1714 __skb_queue_head_init(&queue
);
1716 cork
.base
.flags
= 0;
1718 cork
.base
.opt
= NULL
;
1720 err
= ip6_setup_cork(sk
, &cork
, &v6_cork
, hlimit
, tclass
, opt
, rt
, fl6
);
1722 return ERR_PTR(err
);
1725 dontfrag
= inet6_sk(sk
)->dontfrag
;
1727 err
= __ip6_append_data(sk
, fl6
, &queue
, &cork
.base
, &v6_cork
,
1728 ¤t
->task_frag
, getfrag
, from
,
1729 length
+ exthdrlen
, transhdrlen
+ exthdrlen
,
1732 __ip6_flush_pending_frames(sk
, &queue
, &cork
, &v6_cork
);
1733 return ERR_PTR(err
);
1736 return __ip6_make_skb(sk
, &queue
, &cork
, &v6_cork
);