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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPv6 output functions | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * Based on linux/net/ipv4/ip_output.c |
9 | * | |
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. | |
14 | * | |
15 | * Changes: | |
16 | * A.N.Kuznetsov : airthmetics in fragmentation. | |
17 | * extension headers are implemented. | |
18 | * route changes now work. | |
19 | * ip6_forward does not confuse sniffers. | |
20 | * etc. | |
21 | * | |
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 | |
26 | * for datagram xmit | |
27 | */ | |
28 | ||
1da177e4 | 29 | #include <linux/errno.h> |
ef76bc23 | 30 | #include <linux/kernel.h> |
1da177e4 LT |
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> | |
b59f45d0 | 39 | #include <linux/module.h> |
1da177e4 LT |
40 | |
41 | #include <linux/netfilter.h> | |
42 | #include <linux/netfilter_ipv6.h> | |
43 | ||
44 | #include <net/sock.h> | |
45 | #include <net/snmp.h> | |
46 | ||
47 | #include <net/ipv6.h> | |
48 | #include <net/ndisc.h> | |
49 | #include <net/protocol.h> | |
50 | #include <net/ip6_route.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/rawv6.h> | |
53 | #include <net/icmp.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/checksum.h> | |
7bc570c8 | 56 | #include <linux/mroute6.h> |
1da177e4 LT |
57 | |
58 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); | |
59 | ||
60 | static __inline__ void ipv6_select_ident(struct sk_buff *skb, struct frag_hdr *fhdr) | |
61 | { | |
62 | static u32 ipv6_fragmentation_id = 1; | |
63 | static DEFINE_SPINLOCK(ip6_id_lock); | |
64 | ||
65 | spin_lock_bh(&ip6_id_lock); | |
66 | fhdr->identification = htonl(ipv6_fragmentation_id); | |
67 | if (++ipv6_fragmentation_id == 0) | |
68 | ipv6_fragmentation_id = 1; | |
69 | spin_unlock_bh(&ip6_id_lock); | |
70 | } | |
71 | ||
ef76bc23 HX |
72 | int __ip6_local_out(struct sk_buff *skb) |
73 | { | |
74 | int len; | |
75 | ||
76 | len = skb->len - sizeof(struct ipv6hdr); | |
77 | if (len > IPV6_MAXPLEN) | |
78 | len = 0; | |
79 | ipv6_hdr(skb)->payload_len = htons(len); | |
80 | ||
6e23ae2a | 81 | return nf_hook(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dst->dev, |
ef76bc23 HX |
82 | dst_output); |
83 | } | |
84 | ||
85 | int ip6_local_out(struct sk_buff *skb) | |
86 | { | |
87 | int err; | |
88 | ||
89 | err = __ip6_local_out(skb); | |
90 | if (likely(err == 1)) | |
91 | err = dst_output(skb); | |
92 | ||
93 | return err; | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(ip6_local_out); | |
96 | ||
ad643a79 | 97 | static int ip6_output_finish(struct sk_buff *skb) |
1da177e4 | 98 | { |
1da177e4 | 99 | struct dst_entry *dst = skb->dst; |
1da177e4 | 100 | |
3644f0ce SH |
101 | if (dst->hh) |
102 | return neigh_hh_output(dst->hh, skb); | |
103 | else if (dst->neighbour) | |
1da177e4 LT |
104 | return dst->neighbour->output(skb); |
105 | ||
483a47d2 DL |
106 | IP6_INC_STATS_BH(dev_net(dst->dev), |
107 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
1da177e4 LT |
108 | kfree_skb(skb); |
109 | return -EINVAL; | |
110 | ||
111 | } | |
112 | ||
113 | /* dev_loopback_xmit for use with netfilter. */ | |
114 | static int ip6_dev_loopback_xmit(struct sk_buff *newskb) | |
115 | { | |
459a98ed | 116 | skb_reset_mac_header(newskb); |
bbe735e4 | 117 | __skb_pull(newskb, skb_network_offset(newskb)); |
1da177e4 LT |
118 | newskb->pkt_type = PACKET_LOOPBACK; |
119 | newskb->ip_summed = CHECKSUM_UNNECESSARY; | |
547b792c | 120 | WARN_ON(!newskb->dst); |
1da177e4 LT |
121 | |
122 | netif_rx(newskb); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | ||
127 | static int ip6_output2(struct sk_buff *skb) | |
128 | { | |
129 | struct dst_entry *dst = skb->dst; | |
130 | struct net_device *dev = dst->dev; | |
131 | ||
132 | skb->protocol = htons(ETH_P_IPV6); | |
133 | skb->dev = dev; | |
134 | ||
0660e03f | 135 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
1da177e4 | 136 | struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL; |
a11d206d | 137 | struct inet6_dev *idev = ip6_dst_idev(skb->dst); |
1da177e4 LT |
138 | |
139 | if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) && | |
7bc570c8 YH |
140 | ((mroute6_socket && !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
141 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, | |
142 | &ipv6_hdr(skb)->saddr))) { | |
1da177e4 LT |
143 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
144 | ||
145 | /* Do not check for IFF_ALLMULTI; multicast routing | |
146 | is not supported in any case. | |
147 | */ | |
148 | if (newskb) | |
6e23ae2a PM |
149 | NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, newskb, |
150 | NULL, newskb->dev, | |
1da177e4 LT |
151 | ip6_dev_loopback_xmit); |
152 | ||
0660e03f | 153 | if (ipv6_hdr(skb)->hop_limit == 0) { |
3bd653c8 DL |
154 | IP6_INC_STATS(dev_net(dev), idev, |
155 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
156 | kfree_skb(skb); |
157 | return 0; | |
158 | } | |
159 | } | |
160 | ||
3bd653c8 | 161 | IP6_INC_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCASTPKTS); |
1da177e4 LT |
162 | } |
163 | ||
6e23ae2a PM |
164 | return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dev, |
165 | ip6_output_finish); | |
1da177e4 LT |
166 | } |
167 | ||
628a5c56 JH |
168 | static inline int ip6_skb_dst_mtu(struct sk_buff *skb) |
169 | { | |
170 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; | |
171 | ||
172 | return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ? | |
173 | skb->dst->dev->mtu : dst_mtu(skb->dst); | |
174 | } | |
175 | ||
1da177e4 LT |
176 | int ip6_output(struct sk_buff *skb) |
177 | { | |
778d80be YH |
178 | struct inet6_dev *idev = ip6_dst_idev(skb->dst); |
179 | if (unlikely(idev->cnf.disable_ipv6)) { | |
3bd653c8 DL |
180 | IP6_INC_STATS(dev_net(skb->dst->dev), idev, |
181 | IPSTATS_MIB_OUTDISCARDS); | |
778d80be YH |
182 | kfree_skb(skb); |
183 | return 0; | |
184 | } | |
185 | ||
628a5c56 | 186 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || |
e89e9cf5 | 187 | dst_allfrag(skb->dst)) |
1da177e4 LT |
188 | return ip6_fragment(skb, ip6_output2); |
189 | else | |
190 | return ip6_output2(skb); | |
191 | } | |
192 | ||
1da177e4 LT |
193 | /* |
194 | * xmit an sk_buff (used by TCP) | |
195 | */ | |
196 | ||
197 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, | |
198 | struct ipv6_txoptions *opt, int ipfragok) | |
199 | { | |
3bd653c8 | 200 | struct net *net = sock_net(sk); |
b30bd282 | 201 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 LT |
202 | struct in6_addr *first_hop = &fl->fl6_dst; |
203 | struct dst_entry *dst = skb->dst; | |
204 | struct ipv6hdr *hdr; | |
205 | u8 proto = fl->proto; | |
206 | int seg_len = skb->len; | |
41a1f8ea | 207 | int hlimit, tclass; |
1da177e4 LT |
208 | u32 mtu; |
209 | ||
210 | if (opt) { | |
c2636b4d | 211 | unsigned int head_room; |
1da177e4 LT |
212 | |
213 | /* First: exthdrs may take lots of space (~8K for now) | |
214 | MAX_HEADER is not enough. | |
215 | */ | |
216 | head_room = opt->opt_nflen + opt->opt_flen; | |
217 | seg_len += head_room; | |
218 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
219 | ||
220 | if (skb_headroom(skb) < head_room) { | |
221 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
a11d206d | 222 | if (skb2 == NULL) { |
3bd653c8 | 223 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), |
a11d206d YH |
224 | IPSTATS_MIB_OUTDISCARDS); |
225 | kfree_skb(skb); | |
1da177e4 LT |
226 | return -ENOBUFS; |
227 | } | |
a11d206d YH |
228 | kfree_skb(skb); |
229 | skb = skb2; | |
1da177e4 LT |
230 | if (sk) |
231 | skb_set_owner_w(skb, sk); | |
232 | } | |
233 | if (opt->opt_flen) | |
234 | ipv6_push_frag_opts(skb, opt, &proto); | |
235 | if (opt->opt_nflen) | |
236 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
237 | } | |
238 | ||
e2d1bca7 ACM |
239 | skb_push(skb, sizeof(struct ipv6hdr)); |
240 | skb_reset_network_header(skb); | |
0660e03f | 241 | hdr = ipv6_hdr(skb); |
1da177e4 | 242 | |
77e2f14f WY |
243 | /* Allow local fragmentation. */ |
244 | if (ipfragok) | |
245 | skb->local_df = 1; | |
246 | ||
1da177e4 LT |
247 | /* |
248 | * Fill in the IPv6 header | |
249 | */ | |
250 | ||
1da177e4 LT |
251 | hlimit = -1; |
252 | if (np) | |
253 | hlimit = np->hop_limit; | |
254 | if (hlimit < 0) | |
6b75d090 | 255 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 256 | |
41a1f8ea YH |
257 | tclass = -1; |
258 | if (np) | |
259 | tclass = np->tclass; | |
260 | if (tclass < 0) | |
261 | tclass = 0; | |
262 | ||
90bcaf7b | 263 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel; |
41a1f8ea | 264 | |
1da177e4 LT |
265 | hdr->payload_len = htons(seg_len); |
266 | hdr->nexthdr = proto; | |
267 | hdr->hop_limit = hlimit; | |
268 | ||
269 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | |
270 | ipv6_addr_copy(&hdr->daddr, first_hop); | |
271 | ||
a2c2064f | 272 | skb->priority = sk->sk_priority; |
4a19ec58 | 273 | skb->mark = sk->sk_mark; |
a2c2064f | 274 | |
1da177e4 | 275 | mtu = dst_mtu(dst); |
283d07ac | 276 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
3bd653c8 | 277 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), |
a11d206d | 278 | IPSTATS_MIB_OUTREQUESTS); |
6e23ae2a | 279 | return NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6869c4d8 | 280 | dst_output); |
1da177e4 LT |
281 | } |
282 | ||
283 | if (net_ratelimit()) | |
284 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); | |
285 | skb->dev = dst->dev; | |
286 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); | |
3bd653c8 | 287 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
288 | kfree_skb(skb); |
289 | return -EMSGSIZE; | |
290 | } | |
291 | ||
7159039a YH |
292 | EXPORT_SYMBOL(ip6_xmit); |
293 | ||
1da177e4 LT |
294 | /* |
295 | * To avoid extra problems ND packets are send through this | |
296 | * routine. It's code duplication but I really want to avoid | |
297 | * extra checks since ipv6_build_header is used by TCP (which | |
298 | * is for us performance critical) | |
299 | */ | |
300 | ||
301 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, | |
9acd9f3a | 302 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
1da177e4 LT |
303 | int proto, int len) |
304 | { | |
305 | struct ipv6_pinfo *np = inet6_sk(sk); | |
306 | struct ipv6hdr *hdr; | |
307 | int totlen; | |
308 | ||
309 | skb->protocol = htons(ETH_P_IPV6); | |
310 | skb->dev = dev; | |
311 | ||
312 | totlen = len + sizeof(struct ipv6hdr); | |
313 | ||
55f79cc0 ACM |
314 | skb_reset_network_header(skb); |
315 | skb_put(skb, sizeof(struct ipv6hdr)); | |
0660e03f | 316 | hdr = ipv6_hdr(skb); |
1da177e4 | 317 | |
ae08e1f0 | 318 | *(__be32*)hdr = htonl(0x60000000); |
1da177e4 LT |
319 | |
320 | hdr->payload_len = htons(len); | |
321 | hdr->nexthdr = proto; | |
322 | hdr->hop_limit = np->hop_limit; | |
323 | ||
324 | ipv6_addr_copy(&hdr->saddr, saddr); | |
325 | ipv6_addr_copy(&hdr->daddr, daddr); | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
331 | { | |
332 | struct ip6_ra_chain *ra; | |
333 | struct sock *last = NULL; | |
334 | ||
335 | read_lock(&ip6_ra_lock); | |
336 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
337 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
338 | if (sk && ra->sel == sel && |
339 | (!sk->sk_bound_dev_if || | |
340 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
341 | if (last) { |
342 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
343 | if (skb2) | |
344 | rawv6_rcv(last, skb2); | |
345 | } | |
346 | last = sk; | |
347 | } | |
348 | } | |
349 | ||
350 | if (last) { | |
351 | rawv6_rcv(last, skb); | |
352 | read_unlock(&ip6_ra_lock); | |
353 | return 1; | |
354 | } | |
355 | read_unlock(&ip6_ra_lock); | |
356 | return 0; | |
357 | } | |
358 | ||
e21e0b5f VN |
359 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
360 | { | |
0660e03f | 361 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f VN |
362 | u8 nexthdr = hdr->nexthdr; |
363 | int offset; | |
364 | ||
365 | if (ipv6_ext_hdr(nexthdr)) { | |
366 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr); | |
367 | if (offset < 0) | |
368 | return 0; | |
369 | } else | |
370 | offset = sizeof(struct ipv6hdr); | |
371 | ||
372 | if (nexthdr == IPPROTO_ICMPV6) { | |
373 | struct icmp6hdr *icmp6; | |
374 | ||
d56f90a7 ACM |
375 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
376 | offset + 1 - skb->data))) | |
e21e0b5f VN |
377 | return 0; |
378 | ||
d56f90a7 | 379 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
380 | |
381 | switch (icmp6->icmp6_type) { | |
382 | case NDISC_ROUTER_SOLICITATION: | |
383 | case NDISC_ROUTER_ADVERTISEMENT: | |
384 | case NDISC_NEIGHBOUR_SOLICITATION: | |
385 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
386 | case NDISC_REDIRECT: | |
387 | /* For reaction involving unicast neighbor discovery | |
388 | * message destined to the proxied address, pass it to | |
389 | * input function. | |
390 | */ | |
391 | return 1; | |
392 | default: | |
393 | break; | |
394 | } | |
395 | } | |
396 | ||
74553b09 VN |
397 | /* |
398 | * The proxying router can't forward traffic sent to a link-local | |
399 | * address, so signal the sender and discard the packet. This | |
400 | * behavior is clarified by the MIPv6 specification. | |
401 | */ | |
402 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
403 | dst_link_failure(skb); | |
404 | return -1; | |
405 | } | |
406 | ||
e21e0b5f VN |
407 | return 0; |
408 | } | |
409 | ||
1da177e4 LT |
410 | static inline int ip6_forward_finish(struct sk_buff *skb) |
411 | { | |
412 | return dst_output(skb); | |
413 | } | |
414 | ||
415 | int ip6_forward(struct sk_buff *skb) | |
416 | { | |
417 | struct dst_entry *dst = skb->dst; | |
0660e03f | 418 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 419 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 420 | struct net *net = dev_net(dst->dev); |
1ab1457c | 421 | |
53b7997f | 422 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
423 | goto error; |
424 | ||
4497b076 BH |
425 | if (skb_warn_if_lro(skb)) |
426 | goto drop; | |
427 | ||
1da177e4 | 428 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
3bd653c8 | 429 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
430 | goto drop; |
431 | } | |
432 | ||
35fc92a9 | 433 | skb_forward_csum(skb); |
1da177e4 LT |
434 | |
435 | /* | |
436 | * We DO NOT make any processing on | |
437 | * RA packets, pushing them to user level AS IS | |
438 | * without ane WARRANTY that application will be able | |
439 | * to interpret them. The reason is that we | |
440 | * cannot make anything clever here. | |
441 | * | |
442 | * We are not end-node, so that if packet contains | |
443 | * AH/ESP, we cannot make anything. | |
444 | * Defragmentation also would be mistake, RA packets | |
445 | * cannot be fragmented, because there is no warranty | |
446 | * that different fragments will go along one path. --ANK | |
447 | */ | |
448 | if (opt->ra) { | |
d56f90a7 | 449 | u8 *ptr = skb_network_header(skb) + opt->ra; |
1da177e4 LT |
450 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
451 | return 0; | |
452 | } | |
453 | ||
454 | /* | |
455 | * check and decrement ttl | |
456 | */ | |
457 | if (hdr->hop_limit <= 1) { | |
458 | /* Force OUTPUT device used as source address */ | |
459 | skb->dev = dst->dev; | |
460 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
461 | 0, skb->dev); | |
483a47d2 DL |
462 | IP6_INC_STATS_BH(net, |
463 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
464 | |
465 | kfree_skb(skb); | |
466 | return -ETIMEDOUT; | |
467 | } | |
468 | ||
fbea49e1 | 469 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 470 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 471 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
472 | int proxied = ip6_forward_proxy_check(skb); |
473 | if (proxied > 0) | |
e21e0b5f | 474 | return ip6_input(skb); |
74553b09 | 475 | else if (proxied < 0) { |
3bd653c8 DL |
476 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
477 | IPSTATS_MIB_INDISCARDS); | |
74553b09 VN |
478 | goto drop; |
479 | } | |
e21e0b5f VN |
480 | } |
481 | ||
1da177e4 | 482 | if (!xfrm6_route_forward(skb)) { |
3bd653c8 | 483 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
484 | goto drop; |
485 | } | |
486 | dst = skb->dst; | |
487 | ||
488 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
489 | send redirects to source routed frames. | |
1e5dc146 | 490 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 491 | */ |
1e5dc146 MN |
492 | if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 && |
493 | !skb->sp) { | |
1da177e4 LT |
494 | struct in6_addr *target = NULL; |
495 | struct rt6_info *rt; | |
496 | struct neighbour *n = dst->neighbour; | |
497 | ||
498 | /* | |
499 | * incoming and outgoing devices are the same | |
500 | * send a redirect. | |
501 | */ | |
502 | ||
503 | rt = (struct rt6_info *) dst; | |
504 | if ((rt->rt6i_flags & RTF_GATEWAY)) | |
505 | target = (struct in6_addr*)&n->primary_key; | |
506 | else | |
507 | target = &hdr->daddr; | |
508 | ||
509 | /* Limit redirects both by destination (here) | |
510 | and by source (inside ndisc_send_redirect) | |
511 | */ | |
512 | if (xrlim_allow(dst, 1*HZ)) | |
513 | ndisc_send_redirect(skb, n, target); | |
5bb1ab09 DS |
514 | } else { |
515 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
516 | ||
1da177e4 | 517 | /* This check is security critical. */ |
f81b2e7d YH |
518 | if (addrtype == IPV6_ADDR_ANY || |
519 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
520 | goto error; |
521 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
522 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
523 | ICMPV6_NOT_NEIGHBOUR, 0, skb->dev); | |
524 | goto error; | |
525 | } | |
1da177e4 LT |
526 | } |
527 | ||
528 | if (skb->len > dst_mtu(dst)) { | |
529 | /* Again, force OUTPUT device used as source address */ | |
530 | skb->dev = dst->dev; | |
531 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev); | |
483a47d2 DL |
532 | IP6_INC_STATS_BH(net, |
533 | ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); | |
534 | IP6_INC_STATS_BH(net, | |
535 | ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
536 | kfree_skb(skb); |
537 | return -EMSGSIZE; | |
538 | } | |
539 | ||
540 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
3bd653c8 | 541 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
542 | goto drop; |
543 | } | |
544 | ||
0660e03f | 545 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
546 | |
547 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 548 | |
1da177e4 LT |
549 | hdr->hop_limit--; |
550 | ||
483a47d2 | 551 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
6e23ae2a PM |
552 | return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
553 | ip6_forward_finish); | |
1da177e4 LT |
554 | |
555 | error: | |
483a47d2 | 556 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
557 | drop: |
558 | kfree_skb(skb); | |
559 | return -EINVAL; | |
560 | } | |
561 | ||
562 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
563 | { | |
564 | to->pkt_type = from->pkt_type; | |
565 | to->priority = from->priority; | |
566 | to->protocol = from->protocol; | |
1da177e4 LT |
567 | dst_release(to->dst); |
568 | to->dst = dst_clone(from->dst); | |
569 | to->dev = from->dev; | |
82e91ffe | 570 | to->mark = from->mark; |
1da177e4 LT |
571 | |
572 | #ifdef CONFIG_NET_SCHED | |
573 | to->tc_index = from->tc_index; | |
574 | #endif | |
e7ac05f3 | 575 | nf_copy(to, from); |
ba9dda3a JK |
576 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
577 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
578 | to->nf_trace = from->nf_trace; | |
579 | #endif | |
984bc16c | 580 | skb_copy_secmark(to, from); |
1da177e4 LT |
581 | } |
582 | ||
583 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
584 | { | |
585 | u16 offset = sizeof(struct ipv6hdr); | |
0660e03f ACM |
586 | struct ipv6_opt_hdr *exthdr = |
587 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
27a884dc | 588 | unsigned int packet_len = skb->tail - skb->network_header; |
1da177e4 | 589 | int found_rhdr = 0; |
0660e03f | 590 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
1da177e4 LT |
591 | |
592 | while (offset + 1 <= packet_len) { | |
593 | ||
594 | switch (**nexthdr) { | |
595 | ||
596 | case NEXTHDR_HOP: | |
27637df9 | 597 | break; |
1da177e4 | 598 | case NEXTHDR_ROUTING: |
27637df9 MN |
599 | found_rhdr = 1; |
600 | break; | |
1da177e4 | 601 | case NEXTHDR_DEST: |
59fbb3a6 | 602 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
603 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
604 | break; | |
605 | #endif | |
606 | if (found_rhdr) | |
607 | return offset; | |
1da177e4 LT |
608 | break; |
609 | default : | |
610 | return offset; | |
611 | } | |
27637df9 MN |
612 | |
613 | offset += ipv6_optlen(exthdr); | |
614 | *nexthdr = &exthdr->nexthdr; | |
d56f90a7 ACM |
615 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
616 | offset); | |
1da177e4 LT |
617 | } |
618 | ||
619 | return offset; | |
620 | } | |
621 | ||
622 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) | |
623 | { | |
1da177e4 LT |
624 | struct sk_buff *frag; |
625 | struct rt6_info *rt = (struct rt6_info*)skb->dst; | |
d91675f9 | 626 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
627 | struct ipv6hdr *tmp_hdr; |
628 | struct frag_hdr *fh; | |
629 | unsigned int mtu, hlen, left, len; | |
ae08e1f0 | 630 | __be32 frag_id = 0; |
1da177e4 LT |
631 | int ptr, offset = 0, err=0; |
632 | u8 *prevhdr, nexthdr = 0; | |
3bd653c8 | 633 | struct net *net = dev_net(skb->dst->dev); |
1da177e4 | 634 | |
1da177e4 LT |
635 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
636 | nexthdr = *prevhdr; | |
637 | ||
628a5c56 | 638 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
639 | |
640 | /* We must not fragment if the socket is set to force MTU discovery | |
641 | * or if the skb it not generated by a local socket. (This last | |
642 | * check should be redundant, but it's free.) | |
643 | */ | |
b5c15fc0 | 644 | if (!skb->local_df) { |
b881ef76 JH |
645 | skb->dev = skb->dst->dev; |
646 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); | |
3bd653c8 DL |
647 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), |
648 | IPSTATS_MIB_FRAGFAILS); | |
b881ef76 JH |
649 | kfree_skb(skb); |
650 | return -EMSGSIZE; | |
651 | } | |
652 | ||
d91675f9 YH |
653 | if (np && np->frag_size < mtu) { |
654 | if (np->frag_size) | |
655 | mtu = np->frag_size; | |
656 | } | |
657 | mtu -= hlen + sizeof(struct frag_hdr); | |
1da177e4 LT |
658 | |
659 | if (skb_shinfo(skb)->frag_list) { | |
660 | int first_len = skb_pagelen(skb); | |
29ffe1a5 | 661 | int truesizes = 0; |
1da177e4 LT |
662 | |
663 | if (first_len - hlen > mtu || | |
664 | ((first_len - hlen) & 7) || | |
665 | skb_cloned(skb)) | |
666 | goto slow_path; | |
667 | ||
668 | for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { | |
669 | /* Correct geometry. */ | |
670 | if (frag->len > mtu || | |
671 | ((frag->len & 7) && frag->next) || | |
672 | skb_headroom(frag) < hlen) | |
673 | goto slow_path; | |
674 | ||
1da177e4 LT |
675 | /* Partially cloned skb? */ |
676 | if (skb_shared(frag)) | |
677 | goto slow_path; | |
2fdba6b0 HX |
678 | |
679 | BUG_ON(frag->sk); | |
680 | if (skb->sk) { | |
681 | sock_hold(skb->sk); | |
682 | frag->sk = skb->sk; | |
683 | frag->destructor = sock_wfree; | |
29ffe1a5 | 684 | truesizes += frag->truesize; |
2fdba6b0 | 685 | } |
1da177e4 LT |
686 | } |
687 | ||
688 | err = 0; | |
689 | offset = 0; | |
690 | frag = skb_shinfo(skb)->frag_list; | |
691 | skb_shinfo(skb)->frag_list = NULL; | |
692 | /* BUILD HEADER */ | |
693 | ||
9a217a1c | 694 | *prevhdr = NEXTHDR_FRAGMENT; |
d56f90a7 | 695 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
1da177e4 | 696 | if (!tmp_hdr) { |
3bd653c8 DL |
697 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), |
698 | IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
699 | return -ENOMEM; |
700 | } | |
701 | ||
1da177e4 LT |
702 | __skb_pull(skb, hlen); |
703 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
e2d1bca7 ACM |
704 | __skb_push(skb, hlen); |
705 | skb_reset_network_header(skb); | |
d56f90a7 | 706 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
1da177e4 LT |
707 | |
708 | ipv6_select_ident(skb, fh); | |
709 | fh->nexthdr = nexthdr; | |
710 | fh->reserved = 0; | |
711 | fh->frag_off = htons(IP6_MF); | |
712 | frag_id = fh->identification; | |
713 | ||
714 | first_len = skb_pagelen(skb); | |
715 | skb->data_len = first_len - skb_headlen(skb); | |
29ffe1a5 | 716 | skb->truesize -= truesizes; |
1da177e4 | 717 | skb->len = first_len; |
0660e03f ACM |
718 | ipv6_hdr(skb)->payload_len = htons(first_len - |
719 | sizeof(struct ipv6hdr)); | |
a11d206d YH |
720 | |
721 | dst_hold(&rt->u.dst); | |
1da177e4 LT |
722 | |
723 | for (;;) { | |
724 | /* Prepare header of the next frame, | |
725 | * before previous one went down. */ | |
726 | if (frag) { | |
727 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 728 | skb_reset_transport_header(frag); |
1da177e4 | 729 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
730 | __skb_push(frag, hlen); |
731 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
732 | memcpy(skb_network_header(frag), tmp_hdr, |
733 | hlen); | |
1da177e4 LT |
734 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
735 | fh->nexthdr = nexthdr; | |
736 | fh->reserved = 0; | |
737 | fh->frag_off = htons(offset); | |
738 | if (frag->next != NULL) | |
739 | fh->frag_off |= htons(IP6_MF); | |
740 | fh->identification = frag_id; | |
0660e03f ACM |
741 | ipv6_hdr(frag)->payload_len = |
742 | htons(frag->len - | |
743 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
744 | ip6_copy_metadata(frag, skb); |
745 | } | |
1ab1457c | 746 | |
1da177e4 | 747 | err = output(skb); |
dafee490 | 748 | if(!err) |
3bd653c8 DL |
749 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
750 | IPSTATS_MIB_FRAGCREATES); | |
dafee490 | 751 | |
1da177e4 LT |
752 | if (err || !frag) |
753 | break; | |
754 | ||
755 | skb = frag; | |
756 | frag = skb->next; | |
757 | skb->next = NULL; | |
758 | } | |
759 | ||
a51482bd | 760 | kfree(tmp_hdr); |
1da177e4 LT |
761 | |
762 | if (err == 0) { | |
3bd653c8 DL |
763 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
764 | IPSTATS_MIB_FRAGOKS); | |
a11d206d | 765 | dst_release(&rt->u.dst); |
1da177e4 LT |
766 | return 0; |
767 | } | |
768 | ||
769 | while (frag) { | |
770 | skb = frag->next; | |
771 | kfree_skb(frag); | |
772 | frag = skb; | |
773 | } | |
774 | ||
3bd653c8 DL |
775 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
776 | IPSTATS_MIB_FRAGFAILS); | |
a11d206d | 777 | dst_release(&rt->u.dst); |
1da177e4 LT |
778 | return err; |
779 | } | |
780 | ||
781 | slow_path: | |
782 | left = skb->len - hlen; /* Space per frame */ | |
783 | ptr = hlen; /* Where to start from */ | |
784 | ||
785 | /* | |
786 | * Fragment the datagram. | |
787 | */ | |
788 | ||
789 | *prevhdr = NEXTHDR_FRAGMENT; | |
790 | ||
791 | /* | |
792 | * Keep copying data until we run out. | |
793 | */ | |
794 | while(left > 0) { | |
795 | len = left; | |
796 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
797 | if (len > mtu) | |
798 | len = mtu; | |
799 | /* IF: we are not sending upto and including the packet end | |
800 | then align the next start on an eight byte boundary */ | |
801 | if (len < left) { | |
802 | len &= ~7; | |
803 | } | |
804 | /* | |
805 | * Allocate buffer. | |
806 | */ | |
807 | ||
f5184d26 | 808 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_ALLOCATED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) { |
64ce2073 | 809 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
3bd653c8 | 810 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), |
a11d206d | 811 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
812 | err = -ENOMEM; |
813 | goto fail; | |
814 | } | |
815 | ||
816 | /* | |
817 | * Set up data on packet | |
818 | */ | |
819 | ||
820 | ip6_copy_metadata(frag, skb); | |
821 | skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev)); | |
822 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); | |
c1d2bbe1 | 823 | skb_reset_network_header(frag); |
badff6d0 | 824 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
b0e380b1 ACM |
825 | frag->transport_header = (frag->network_header + hlen + |
826 | sizeof(struct frag_hdr)); | |
1da177e4 LT |
827 | |
828 | /* | |
829 | * Charge the memory for the fragment to any owner | |
830 | * it might possess | |
831 | */ | |
832 | if (skb->sk) | |
833 | skb_set_owner_w(frag, skb->sk); | |
834 | ||
835 | /* | |
836 | * Copy the packet header into the new buffer. | |
837 | */ | |
d626f62b | 838 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
1da177e4 LT |
839 | |
840 | /* | |
841 | * Build fragment header. | |
842 | */ | |
843 | fh->nexthdr = nexthdr; | |
844 | fh->reserved = 0; | |
f36d6ab1 | 845 | if (!frag_id) { |
1da177e4 LT |
846 | ipv6_select_ident(skb, fh); |
847 | frag_id = fh->identification; | |
848 | } else | |
849 | fh->identification = frag_id; | |
850 | ||
851 | /* | |
852 | * Copy a block of the IP datagram. | |
853 | */ | |
8984e41d | 854 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
1da177e4 LT |
855 | BUG(); |
856 | left -= len; | |
857 | ||
858 | fh->frag_off = htons(offset); | |
859 | if (left > 0) | |
860 | fh->frag_off |= htons(IP6_MF); | |
0660e03f ACM |
861 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
862 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
863 | |
864 | ptr += len; | |
865 | offset += len; | |
866 | ||
867 | /* | |
868 | * Put this fragment into the sending queue. | |
869 | */ | |
1da177e4 LT |
870 | err = output(frag); |
871 | if (err) | |
872 | goto fail; | |
dafee490 | 873 | |
3bd653c8 DL |
874 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), |
875 | IPSTATS_MIB_FRAGCREATES); | |
1da177e4 | 876 | } |
3bd653c8 | 877 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), |
a11d206d | 878 | IPSTATS_MIB_FRAGOKS); |
1da177e4 | 879 | kfree_skb(skb); |
1da177e4 LT |
880 | return err; |
881 | ||
882 | fail: | |
3bd653c8 | 883 | IP6_INC_STATS(net, ip6_dst_idev(skb->dst), |
a11d206d | 884 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 885 | kfree_skb(skb); |
1da177e4 LT |
886 | return err; |
887 | } | |
888 | ||
cf6b1982 YH |
889 | static inline int ip6_rt_check(struct rt6key *rt_key, |
890 | struct in6_addr *fl_addr, | |
891 | struct in6_addr *addr_cache) | |
892 | { | |
893 | return ((rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && | |
894 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache))); | |
895 | } | |
896 | ||
497c615a HX |
897 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
898 | struct dst_entry *dst, | |
899 | struct flowi *fl) | |
1da177e4 | 900 | { |
497c615a HX |
901 | struct ipv6_pinfo *np = inet6_sk(sk); |
902 | struct rt6_info *rt = (struct rt6_info *)dst; | |
1da177e4 | 903 | |
497c615a HX |
904 | if (!dst) |
905 | goto out; | |
906 | ||
907 | /* Yes, checking route validity in not connected | |
908 | * case is not very simple. Take into account, | |
909 | * that we do not support routing by source, TOS, | |
910 | * and MSG_DONTROUTE --ANK (980726) | |
911 | * | |
cf6b1982 YH |
912 | * 1. ip6_rt_check(): If route was host route, |
913 | * check that cached destination is current. | |
497c615a HX |
914 | * If it is network route, we still may |
915 | * check its validity using saved pointer | |
916 | * to the last used address: daddr_cache. | |
917 | * We do not want to save whole address now, | |
918 | * (because main consumer of this service | |
919 | * is tcp, which has not this problem), | |
920 | * so that the last trick works only on connected | |
921 | * sockets. | |
922 | * 2. oif also should be the same. | |
923 | */ | |
cf6b1982 | 924 | if (ip6_rt_check(&rt->rt6i_dst, &fl->fl6_dst, np->daddr_cache) || |
8e1ef0a9 YH |
925 | #ifdef CONFIG_IPV6_SUBTREES |
926 | ip6_rt_check(&rt->rt6i_src, &fl->fl6_src, np->saddr_cache) || | |
927 | #endif | |
cf6b1982 | 928 | (fl->oif && fl->oif != dst->dev->ifindex)) { |
497c615a HX |
929 | dst_release(dst); |
930 | dst = NULL; | |
1da177e4 LT |
931 | } |
932 | ||
497c615a HX |
933 | out: |
934 | return dst; | |
935 | } | |
936 | ||
937 | static int ip6_dst_lookup_tail(struct sock *sk, | |
938 | struct dst_entry **dst, struct flowi *fl) | |
939 | { | |
940 | int err; | |
3b1e0a65 | 941 | struct net *net = sock_net(sk); |
497c615a | 942 | |
1da177e4 | 943 | if (*dst == NULL) |
8a3edd80 | 944 | *dst = ip6_route_output(net, sk, fl); |
1da177e4 LT |
945 | |
946 | if ((err = (*dst)->error)) | |
947 | goto out_err_release; | |
948 | ||
949 | if (ipv6_addr_any(&fl->fl6_src)) { | |
191cd582 | 950 | err = ipv6_dev_get_saddr(net, ip6_dst_idev(*dst)->dev, |
7cbca67c YH |
951 | &fl->fl6_dst, |
952 | sk ? inet6_sk(sk)->srcprefs : 0, | |
953 | &fl->fl6_src); | |
44456d37 | 954 | if (err) |
1da177e4 | 955 | goto out_err_release; |
1da177e4 LT |
956 | } |
957 | ||
95c385b4 | 958 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
959 | /* |
960 | * Here if the dst entry we've looked up | |
961 | * has a neighbour entry that is in the INCOMPLETE | |
962 | * state and the src address from the flow is | |
963 | * marked as OPTIMISTIC, we release the found | |
964 | * dst entry and replace it instead with the | |
965 | * dst entry of the nexthop router | |
966 | */ | |
967 | if ((*dst)->neighbour && !((*dst)->neighbour->nud_state & NUD_VALID)) { | |
968 | struct inet6_ifaddr *ifp; | |
969 | struct flowi fl_gw; | |
970 | int redirect; | |
971 | ||
972 | ifp = ipv6_get_ifaddr(net, &fl->fl6_src, | |
973 | (*dst)->dev, 1); | |
974 | ||
975 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
976 | if (ifp) | |
977 | in6_ifa_put(ifp); | |
978 | ||
979 | if (redirect) { | |
980 | /* | |
981 | * We need to get the dst entry for the | |
982 | * default router instead | |
983 | */ | |
984 | dst_release(*dst); | |
985 | memcpy(&fl_gw, fl, sizeof(struct flowi)); | |
986 | memset(&fl_gw.fl6_dst, 0, sizeof(struct in6_addr)); | |
987 | *dst = ip6_route_output(net, sk, &fl_gw); | |
988 | if ((err = (*dst)->error)) | |
989 | goto out_err_release; | |
95c385b4 | 990 | } |
e550dfb0 | 991 | } |
95c385b4 NH |
992 | #endif |
993 | ||
1da177e4 LT |
994 | return 0; |
995 | ||
996 | out_err_release: | |
ca46f9c8 | 997 | if (err == -ENETUNREACH) |
483a47d2 | 998 | IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
999 | dst_release(*dst); |
1000 | *dst = NULL; | |
1001 | return err; | |
1002 | } | |
34a0b3cd | 1003 | |
497c615a HX |
1004 | /** |
1005 | * ip6_dst_lookup - perform route lookup on flow | |
1006 | * @sk: socket which provides route info | |
1007 | * @dst: pointer to dst_entry * for result | |
1008 | * @fl: flow to lookup | |
1009 | * | |
1010 | * This function performs a route lookup on the given flow. | |
1011 | * | |
1012 | * It returns zero on success, or a standard errno code on error. | |
1013 | */ | |
1014 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) | |
1015 | { | |
1016 | *dst = NULL; | |
1017 | return ip6_dst_lookup_tail(sk, dst, fl); | |
1018 | } | |
3cf3dc6c ACM |
1019 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
1020 | ||
497c615a HX |
1021 | /** |
1022 | * ip6_sk_dst_lookup - perform socket cached route lookup on flow | |
1023 | * @sk: socket which provides the dst cache and route info | |
1024 | * @dst: pointer to dst_entry * for result | |
1025 | * @fl: flow to lookup | |
1026 | * | |
1027 | * This function performs a route lookup on the given flow with the | |
1028 | * possibility of using the cached route in the socket if it is valid. | |
1029 | * It will take the socket dst lock when operating on the dst cache. | |
1030 | * As a result, this function can only be used in process context. | |
1031 | * | |
1032 | * It returns zero on success, or a standard errno code on error. | |
1033 | */ | |
1034 | int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) | |
1035 | { | |
1036 | *dst = NULL; | |
1037 | if (sk) { | |
1038 | *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); | |
1039 | *dst = ip6_sk_dst_check(sk, *dst, fl); | |
1040 | } | |
1041 | ||
1042 | return ip6_dst_lookup_tail(sk, dst, fl); | |
1043 | } | |
1044 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup); | |
1045 | ||
34a0b3cd | 1046 | static inline int ip6_ufo_append_data(struct sock *sk, |
e89e9cf5 AR |
1047 | int getfrag(void *from, char *to, int offset, int len, |
1048 | int odd, struct sk_buff *skb), | |
1049 | void *from, int length, int hh_len, int fragheaderlen, | |
1050 | int transhdrlen, int mtu,unsigned int flags) | |
1051 | ||
1052 | { | |
1053 | struct sk_buff *skb; | |
1054 | int err; | |
1055 | ||
1056 | /* There is support for UDP large send offload by network | |
1057 | * device, so create one single skb packet containing complete | |
1058 | * udp datagram | |
1059 | */ | |
1060 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
1061 | skb = sock_alloc_send_skb(sk, | |
1062 | hh_len + fragheaderlen + transhdrlen + 20, | |
1063 | (flags & MSG_DONTWAIT), &err); | |
1064 | if (skb == NULL) | |
1065 | return -ENOMEM; | |
1066 | ||
1067 | /* reserve space for Hardware header */ | |
1068 | skb_reserve(skb, hh_len); | |
1069 | ||
1070 | /* create space for UDP/IP header */ | |
1071 | skb_put(skb,fragheaderlen + transhdrlen); | |
1072 | ||
1073 | /* initialize network header pointer */ | |
c1d2bbe1 | 1074 | skb_reset_network_header(skb); |
e89e9cf5 AR |
1075 | |
1076 | /* initialize protocol header pointer */ | |
b0e380b1 | 1077 | skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf5 | 1078 | |
84fa7933 | 1079 | skb->ip_summed = CHECKSUM_PARTIAL; |
e89e9cf5 AR |
1080 | skb->csum = 0; |
1081 | sk->sk_sndmsg_off = 0; | |
1082 | } | |
1083 | ||
1084 | err = skb_append_datato_frags(sk,skb, getfrag, from, | |
1085 | (length - transhdrlen)); | |
1086 | if (!err) { | |
1087 | struct frag_hdr fhdr; | |
1088 | ||
1089 | /* specify the length of each IP datagram fragment*/ | |
1ab1457c | 1090 | skb_shinfo(skb)->gso_size = mtu - fragheaderlen - |
7967168c | 1091 | sizeof(struct frag_hdr); |
f83ef8c0 | 1092 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
e89e9cf5 AR |
1093 | ipv6_select_ident(skb, &fhdr); |
1094 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; | |
1095 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1096 | ||
1097 | return 0; | |
1098 | } | |
1099 | /* There is not enough support do UPD LSO, | |
1100 | * so follow normal path | |
1101 | */ | |
1102 | kfree_skb(skb); | |
1103 | ||
1104 | return err; | |
1105 | } | |
1da177e4 | 1106 | |
41a1f8ea YH |
1107 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
1108 | int offset, int len, int odd, struct sk_buff *skb), | |
1109 | void *from, int length, int transhdrlen, | |
1110 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl, | |
1111 | struct rt6_info *rt, unsigned int flags) | |
1da177e4 LT |
1112 | { |
1113 | struct inet_sock *inet = inet_sk(sk); | |
1114 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1115 | struct sk_buff *skb; | |
1116 | unsigned int maxfraglen, fragheaderlen; | |
1117 | int exthdrlen; | |
1118 | int hh_len; | |
1119 | int mtu; | |
1120 | int copy; | |
1121 | int err; | |
1122 | int offset = 0; | |
1123 | int csummode = CHECKSUM_NONE; | |
1124 | ||
1125 | if (flags&MSG_PROBE) | |
1126 | return 0; | |
1127 | if (skb_queue_empty(&sk->sk_write_queue)) { | |
1128 | /* | |
1129 | * setup for corking | |
1130 | */ | |
1131 | if (opt) { | |
1132 | if (np->cork.opt == NULL) { | |
1133 | np->cork.opt = kmalloc(opt->tot_len, | |
1134 | sk->sk_allocation); | |
1135 | if (unlikely(np->cork.opt == NULL)) | |
1136 | return -ENOBUFS; | |
1137 | } else if (np->cork.opt->tot_len < opt->tot_len) { | |
1138 | printk(KERN_DEBUG "ip6_append_data: invalid option length\n"); | |
1139 | return -EINVAL; | |
1140 | } | |
1141 | memcpy(np->cork.opt, opt, opt->tot_len); | |
1142 | inet->cork.flags |= IPCORK_OPT; | |
1143 | /* need source address above miyazawa*/ | |
1144 | } | |
1145 | dst_hold(&rt->u.dst); | |
c8cdaf99 | 1146 | inet->cork.dst = &rt->u.dst; |
1da177e4 LT |
1147 | inet->cork.fl = *fl; |
1148 | np->cork.hop_limit = hlimit; | |
41a1f8ea | 1149 | np->cork.tclass = tclass; |
628a5c56 JH |
1150 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? |
1151 | rt->u.dst.dev->mtu : dst_mtu(rt->u.dst.path); | |
c7503609 | 1152 | if (np->frag_size < mtu) { |
d91675f9 YH |
1153 | if (np->frag_size) |
1154 | mtu = np->frag_size; | |
1155 | } | |
1156 | inet->cork.fragsize = mtu; | |
1da177e4 LT |
1157 | if (dst_allfrag(rt->u.dst.path)) |
1158 | inet->cork.flags |= IPCORK_ALLFRAG; | |
1159 | inet->cork.length = 0; | |
1160 | sk->sk_sndmsg_page = NULL; | |
1161 | sk->sk_sndmsg_off = 0; | |
01488942 | 1162 | exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0) - |
a1b05140 | 1163 | rt->rt6i_nfheader_len; |
1da177e4 LT |
1164 | length += exthdrlen; |
1165 | transhdrlen += exthdrlen; | |
1166 | } else { | |
c8cdaf99 | 1167 | rt = (struct rt6_info *)inet->cork.dst; |
1da177e4 LT |
1168 | fl = &inet->cork.fl; |
1169 | if (inet->cork.flags & IPCORK_OPT) | |
1170 | opt = np->cork.opt; | |
1171 | transhdrlen = 0; | |
1172 | exthdrlen = 0; | |
1173 | mtu = inet->cork.fragsize; | |
1174 | } | |
1175 | ||
1176 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); | |
1177 | ||
a1b05140 | 1178 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1179 | (opt ? opt->opt_nflen : 0); |
1da177e4 LT |
1180 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); |
1181 | ||
1182 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
1183 | if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { | |
1184 | ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen); | |
1185 | return -EMSGSIZE; | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Let's try using as much space as possible. | |
1191 | * Use MTU if total length of the message fits into the MTU. | |
1192 | * Otherwise, we need to reserve fragment header and | |
1193 | * fragment alignment (= 8-15 octects, in total). | |
1194 | * | |
1195 | * Note that we may need to "move" the data from the tail of | |
1ab1457c | 1196 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1197 | * the message. |
1198 | * | |
1ab1457c | 1199 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1200 | * at once if non-fragmentable extension headers |
1201 | * are too large. | |
1ab1457c | 1202 | * --yoshfuji |
1da177e4 LT |
1203 | */ |
1204 | ||
1205 | inet->cork.length += length; | |
e89e9cf5 AR |
1206 | if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) && |
1207 | (rt->u.dst.dev->features & NETIF_F_UFO)) { | |
1208 | ||
baa829d8 PM |
1209 | err = ip6_ufo_append_data(sk, getfrag, from, length, hh_len, |
1210 | fragheaderlen, transhdrlen, mtu, | |
1211 | flags); | |
1212 | if (err) | |
e89e9cf5 | 1213 | goto error; |
e89e9cf5 AR |
1214 | return 0; |
1215 | } | |
1da177e4 LT |
1216 | |
1217 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) | |
1218 | goto alloc_new_skb; | |
1219 | ||
1220 | while (length > 0) { | |
1221 | /* Check if the remaining data fits into current packet. */ | |
1222 | copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; | |
1223 | if (copy < length) | |
1224 | copy = maxfraglen - skb->len; | |
1225 | ||
1226 | if (copy <= 0) { | |
1227 | char *data; | |
1228 | unsigned int datalen; | |
1229 | unsigned int fraglen; | |
1230 | unsigned int fraggap; | |
1231 | unsigned int alloclen; | |
1232 | struct sk_buff *skb_prev; | |
1233 | alloc_new_skb: | |
1234 | skb_prev = skb; | |
1235 | ||
1236 | /* There's no room in the current skb */ | |
1237 | if (skb_prev) | |
1238 | fraggap = skb_prev->len - maxfraglen; | |
1239 | else | |
1240 | fraggap = 0; | |
1241 | ||
1242 | /* | |
1243 | * If remaining data exceeds the mtu, | |
1244 | * we know we need more fragment(s). | |
1245 | */ | |
1246 | datalen = length + fraggap; | |
1247 | if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) | |
1248 | datalen = maxfraglen - fragheaderlen; | |
1249 | ||
1250 | fraglen = datalen + fragheaderlen; | |
1251 | if ((flags & MSG_MORE) && | |
1252 | !(rt->u.dst.dev->features&NETIF_F_SG)) | |
1253 | alloclen = mtu; | |
1254 | else | |
1255 | alloclen = datalen + fragheaderlen; | |
1256 | ||
1257 | /* | |
1258 | * The last fragment gets additional space at tail. | |
1259 | * Note: we overallocate on fragments with MSG_MODE | |
1260 | * because we have no idea if we're the last one. | |
1261 | */ | |
1262 | if (datalen == length + fraggap) | |
1263 | alloclen += rt->u.dst.trailer_len; | |
1264 | ||
1265 | /* | |
1266 | * We just reserve space for fragment header. | |
1ab1457c | 1267 | * Note: this may be overallocation if the message |
1da177e4 LT |
1268 | * (without MSG_MORE) fits into the MTU. |
1269 | */ | |
1270 | alloclen += sizeof(struct frag_hdr); | |
1271 | ||
1272 | if (transhdrlen) { | |
1273 | skb = sock_alloc_send_skb(sk, | |
1274 | alloclen + hh_len, | |
1275 | (flags & MSG_DONTWAIT), &err); | |
1276 | } else { | |
1277 | skb = NULL; | |
1278 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1279 | 2 * sk->sk_sndbuf) | |
1280 | skb = sock_wmalloc(sk, | |
1281 | alloclen + hh_len, 1, | |
1282 | sk->sk_allocation); | |
1283 | if (unlikely(skb == NULL)) | |
1284 | err = -ENOBUFS; | |
1285 | } | |
1286 | if (skb == NULL) | |
1287 | goto error; | |
1288 | /* | |
1289 | * Fill in the control structures | |
1290 | */ | |
1291 | skb->ip_summed = csummode; | |
1292 | skb->csum = 0; | |
1293 | /* reserve for fragmentation */ | |
1294 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); | |
1295 | ||
1296 | /* | |
1297 | * Find where to start putting bytes | |
1298 | */ | |
1299 | data = skb_put(skb, fraglen); | |
c14d2450 | 1300 | skb_set_network_header(skb, exthdrlen); |
1da177e4 | 1301 | data += fragheaderlen; |
b0e380b1 ACM |
1302 | skb->transport_header = (skb->network_header + |
1303 | fragheaderlen); | |
1da177e4 LT |
1304 | if (fraggap) { |
1305 | skb->csum = skb_copy_and_csum_bits( | |
1306 | skb_prev, maxfraglen, | |
1307 | data + transhdrlen, fraggap, 0); | |
1308 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1309 | skb->csum); | |
1310 | data += fraggap; | |
e9fa4f7b | 1311 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1312 | } |
1313 | copy = datalen - transhdrlen - fraggap; | |
1314 | if (copy < 0) { | |
1315 | err = -EINVAL; | |
1316 | kfree_skb(skb); | |
1317 | goto error; | |
1318 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1319 | err = -EFAULT; | |
1320 | kfree_skb(skb); | |
1321 | goto error; | |
1322 | } | |
1323 | ||
1324 | offset += copy; | |
1325 | length -= datalen - fraggap; | |
1326 | transhdrlen = 0; | |
1327 | exthdrlen = 0; | |
1328 | csummode = CHECKSUM_NONE; | |
1329 | ||
1330 | /* | |
1331 | * Put the packet on the pending queue | |
1332 | */ | |
1333 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1334 | continue; | |
1335 | } | |
1336 | ||
1337 | if (copy > length) | |
1338 | copy = length; | |
1339 | ||
1340 | if (!(rt->u.dst.dev->features&NETIF_F_SG)) { | |
1341 | unsigned int off; | |
1342 | ||
1343 | off = skb->len; | |
1344 | if (getfrag(from, skb_put(skb, copy), | |
1345 | offset, copy, off, skb) < 0) { | |
1346 | __skb_trim(skb, off); | |
1347 | err = -EFAULT; | |
1348 | goto error; | |
1349 | } | |
1350 | } else { | |
1351 | int i = skb_shinfo(skb)->nr_frags; | |
1352 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | |
1353 | struct page *page = sk->sk_sndmsg_page; | |
1354 | int off = sk->sk_sndmsg_off; | |
1355 | unsigned int left; | |
1356 | ||
1357 | if (page && (left = PAGE_SIZE - off) > 0) { | |
1358 | if (copy >= left) | |
1359 | copy = left; | |
1360 | if (page != frag->page) { | |
1361 | if (i == MAX_SKB_FRAGS) { | |
1362 | err = -EMSGSIZE; | |
1363 | goto error; | |
1364 | } | |
1365 | get_page(page); | |
1366 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); | |
1367 | frag = &skb_shinfo(skb)->frags[i]; | |
1368 | } | |
1369 | } else if(i < MAX_SKB_FRAGS) { | |
1370 | if (copy > PAGE_SIZE) | |
1371 | copy = PAGE_SIZE; | |
1372 | page = alloc_pages(sk->sk_allocation, 0); | |
1373 | if (page == NULL) { | |
1374 | err = -ENOMEM; | |
1375 | goto error; | |
1376 | } | |
1377 | sk->sk_sndmsg_page = page; | |
1378 | sk->sk_sndmsg_off = 0; | |
1379 | ||
1380 | skb_fill_page_desc(skb, i, page, 0, 0); | |
1381 | frag = &skb_shinfo(skb)->frags[i]; | |
1da177e4 LT |
1382 | } else { |
1383 | err = -EMSGSIZE; | |
1384 | goto error; | |
1385 | } | |
1386 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { | |
1387 | err = -EFAULT; | |
1388 | goto error; | |
1389 | } | |
1390 | sk->sk_sndmsg_off += copy; | |
1391 | frag->size += copy; | |
1392 | skb->len += copy; | |
1393 | skb->data_len += copy; | |
f945fa7a HX |
1394 | skb->truesize += copy; |
1395 | atomic_add(copy, &sk->sk_wmem_alloc); | |
1da177e4 LT |
1396 | } |
1397 | offset += copy; | |
1398 | length -= copy; | |
1399 | } | |
1400 | return 0; | |
1401 | error: | |
1402 | inet->cork.length -= length; | |
3bd653c8 | 1403 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1404 | return err; |
1405 | } | |
1406 | ||
bf138862 PE |
1407 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
1408 | { | |
1409 | inet->cork.flags &= ~IPCORK_OPT; | |
1410 | kfree(np->cork.opt); | |
1411 | np->cork.opt = NULL; | |
c8cdaf99 YH |
1412 | if (inet->cork.dst) { |
1413 | dst_release(inet->cork.dst); | |
1414 | inet->cork.dst = NULL; | |
bf138862 PE |
1415 | inet->cork.flags &= ~IPCORK_ALLFRAG; |
1416 | } | |
1417 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1418 | } | |
1419 | ||
1da177e4 LT |
1420 | int ip6_push_pending_frames(struct sock *sk) |
1421 | { | |
1422 | struct sk_buff *skb, *tmp_skb; | |
1423 | struct sk_buff **tail_skb; | |
1424 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1425 | struct inet_sock *inet = inet_sk(sk); | |
1426 | struct ipv6_pinfo *np = inet6_sk(sk); | |
3bd653c8 | 1427 | struct net *net = sock_net(sk); |
1da177e4 LT |
1428 | struct ipv6hdr *hdr; |
1429 | struct ipv6_txoptions *opt = np->cork.opt; | |
c8cdaf99 | 1430 | struct rt6_info *rt = (struct rt6_info *)inet->cork.dst; |
1da177e4 LT |
1431 | struct flowi *fl = &inet->cork.fl; |
1432 | unsigned char proto = fl->proto; | |
1433 | int err = 0; | |
1434 | ||
1435 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1436 | goto out; | |
1437 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1438 | ||
1439 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1440 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1441 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1442 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
cfe1fc77 | 1443 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1444 | *tail_skb = tmp_skb; |
1445 | tail_skb = &(tmp_skb->next); | |
1446 | skb->len += tmp_skb->len; | |
1447 | skb->data_len += tmp_skb->len; | |
1da177e4 LT |
1448 | skb->truesize += tmp_skb->truesize; |
1449 | __sock_put(tmp_skb->sk); | |
1450 | tmp_skb->destructor = NULL; | |
1451 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1452 | } |
1453 | ||
28a89453 | 1454 | /* Allow local fragmentation. */ |
b5c15fc0 | 1455 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
28a89453 HX |
1456 | skb->local_df = 1; |
1457 | ||
1da177e4 | 1458 | ipv6_addr_copy(final_dst, &fl->fl6_dst); |
cfe1fc77 | 1459 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1460 | if (opt && opt->opt_flen) |
1461 | ipv6_push_frag_opts(skb, opt, &proto); | |
1462 | if (opt && opt->opt_nflen) | |
1463 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1464 | ||
e2d1bca7 ACM |
1465 | skb_push(skb, sizeof(struct ipv6hdr)); |
1466 | skb_reset_network_header(skb); | |
0660e03f | 1467 | hdr = ipv6_hdr(skb); |
1ab1457c | 1468 | |
90bcaf7b | 1469 | *(__be32*)hdr = fl->fl6_flowlabel | |
41a1f8ea | 1470 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
1da177e4 | 1471 | |
1da177e4 LT |
1472 | hdr->hop_limit = np->cork.hop_limit; |
1473 | hdr->nexthdr = proto; | |
1474 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | |
1475 | ipv6_addr_copy(&hdr->daddr, final_dst); | |
1476 | ||
a2c2064f | 1477 | skb->priority = sk->sk_priority; |
4a19ec58 | 1478 | skb->mark = sk->sk_mark; |
a2c2064f | 1479 | |
1da177e4 | 1480 | skb->dst = dst_clone(&rt->u.dst); |
3bd653c8 | 1481 | IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); |
14878f75 DS |
1482 | if (proto == IPPROTO_ICMPV6) { |
1483 | struct inet6_dev *idev = ip6_dst_idev(skb->dst); | |
1484 | ||
5a57d4c7 | 1485 | ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); |
e41b5368 | 1486 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); |
14878f75 DS |
1487 | } |
1488 | ||
ef76bc23 | 1489 | err = ip6_local_out(skb); |
1da177e4 LT |
1490 | if (err) { |
1491 | if (err > 0) | |
3320da89 | 1492 | err = np->recverr ? net_xmit_errno(err) : 0; |
1da177e4 LT |
1493 | if (err) |
1494 | goto error; | |
1495 | } | |
1496 | ||
1497 | out: | |
bf138862 | 1498 | ip6_cork_release(inet, np); |
1da177e4 LT |
1499 | return err; |
1500 | error: | |
1501 | goto out; | |
1502 | } | |
1503 | ||
1504 | void ip6_flush_pending_frames(struct sock *sk) | |
1505 | { | |
1da177e4 LT |
1506 | struct sk_buff *skb; |
1507 | ||
1508 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
e1f52208 | 1509 | if (skb->dst) |
3bd653c8 | 1510 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb->dst), |
e1f52208 | 1511 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1512 | kfree_skb(skb); |
1513 | } | |
1514 | ||
bf138862 | 1515 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
1da177e4 | 1516 | } |