Commit | Line | Data |
---|---|---|
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 | ||
ef76bc23 HX |
60 | int __ip6_local_out(struct sk_buff *skb) |
61 | { | |
62 | int len; | |
63 | ||
64 | len = skb->len - sizeof(struct ipv6hdr); | |
65 | if (len > IPV6_MAXPLEN) | |
66 | len = 0; | |
67 | ipv6_hdr(skb)->payload_len = htons(len); | |
68 | ||
adf30907 | 69 | return nf_hook(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb_dst(skb)->dev, |
ef76bc23 HX |
70 | dst_output); |
71 | } | |
72 | ||
73 | int ip6_local_out(struct sk_buff *skb) | |
74 | { | |
75 | int err; | |
76 | ||
77 | err = __ip6_local_out(skb); | |
78 | if (likely(err == 1)) | |
79 | err = dst_output(skb); | |
80 | ||
81 | return err; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(ip6_local_out); | |
84 | ||
ad643a79 | 85 | static int ip6_output_finish(struct sk_buff *skb) |
1da177e4 | 86 | { |
adf30907 | 87 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 88 | |
3644f0ce SH |
89 | if (dst->hh) |
90 | return neigh_hh_output(dst->hh, skb); | |
91 | else if (dst->neighbour) | |
1da177e4 LT |
92 | return dst->neighbour->output(skb); |
93 | ||
483a47d2 DL |
94 | IP6_INC_STATS_BH(dev_net(dst->dev), |
95 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
1da177e4 LT |
96 | kfree_skb(skb); |
97 | return -EINVAL; | |
98 | ||
99 | } | |
100 | ||
101 | /* dev_loopback_xmit for use with netfilter. */ | |
102 | static int ip6_dev_loopback_xmit(struct sk_buff *newskb) | |
103 | { | |
459a98ed | 104 | skb_reset_mac_header(newskb); |
bbe735e4 | 105 | __skb_pull(newskb, skb_network_offset(newskb)); |
1da177e4 LT |
106 | newskb->pkt_type = PACKET_LOOPBACK; |
107 | newskb->ip_summed = CHECKSUM_UNNECESSARY; | |
adf30907 | 108 | WARN_ON(!skb_dst(newskb)); |
1da177e4 LT |
109 | |
110 | netif_rx(newskb); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | ||
115 | static int ip6_output2(struct sk_buff *skb) | |
116 | { | |
adf30907 | 117 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
118 | struct net_device *dev = dst->dev; |
119 | ||
120 | skb->protocol = htons(ETH_P_IPV6); | |
121 | skb->dev = dev; | |
122 | ||
0660e03f | 123 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
1da177e4 | 124 | struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL; |
adf30907 | 125 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
1da177e4 LT |
126 | |
127 | if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) && | |
bd91b8bf BT |
128 | ((mroute6_socket(dev_net(dev)) && |
129 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || | |
7bc570c8 YH |
130 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
131 | &ipv6_hdr(skb)->saddr))) { | |
1da177e4 LT |
132 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
133 | ||
134 | /* Do not check for IFF_ALLMULTI; multicast routing | |
135 | is not supported in any case. | |
136 | */ | |
137 | if (newskb) | |
6e23ae2a PM |
138 | NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, newskb, |
139 | NULL, newskb->dev, | |
1da177e4 LT |
140 | ip6_dev_loopback_xmit); |
141 | ||
0660e03f | 142 | if (ipv6_hdr(skb)->hop_limit == 0) { |
3bd653c8 DL |
143 | IP6_INC_STATS(dev_net(dev), idev, |
144 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
145 | kfree_skb(skb); |
146 | return 0; | |
147 | } | |
148 | } | |
149 | ||
edf391ff NH |
150 | IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST, |
151 | skb->len); | |
1da177e4 LT |
152 | } |
153 | ||
6e23ae2a PM |
154 | return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dev, |
155 | ip6_output_finish); | |
1da177e4 LT |
156 | } |
157 | ||
628a5c56 JH |
158 | static inline int ip6_skb_dst_mtu(struct sk_buff *skb) |
159 | { | |
160 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; | |
161 | ||
162 | return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ? | |
adf30907 | 163 | skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); |
628a5c56 JH |
164 | } |
165 | ||
1da177e4 LT |
166 | int ip6_output(struct sk_buff *skb) |
167 | { | |
adf30907 | 168 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
778d80be | 169 | if (unlikely(idev->cnf.disable_ipv6)) { |
adf30907 | 170 | IP6_INC_STATS(dev_net(skb_dst(skb)->dev), idev, |
3bd653c8 | 171 | IPSTATS_MIB_OUTDISCARDS); |
778d80be YH |
172 | kfree_skb(skb); |
173 | return 0; | |
174 | } | |
175 | ||
628a5c56 | 176 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || |
adf30907 | 177 | dst_allfrag(skb_dst(skb))) |
1da177e4 LT |
178 | return ip6_fragment(skb, ip6_output2); |
179 | else | |
180 | return ip6_output2(skb); | |
181 | } | |
182 | ||
1da177e4 LT |
183 | /* |
184 | * xmit an sk_buff (used by TCP) | |
185 | */ | |
186 | ||
187 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, | |
188 | struct ipv6_txoptions *opt, int ipfragok) | |
189 | { | |
3bd653c8 | 190 | struct net *net = sock_net(sk); |
b30bd282 | 191 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 192 | struct in6_addr *first_hop = &fl->fl6_dst; |
adf30907 | 193 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
194 | struct ipv6hdr *hdr; |
195 | u8 proto = fl->proto; | |
196 | int seg_len = skb->len; | |
41a1f8ea | 197 | int hlimit, tclass; |
1da177e4 LT |
198 | u32 mtu; |
199 | ||
200 | if (opt) { | |
c2636b4d | 201 | unsigned int head_room; |
1da177e4 LT |
202 | |
203 | /* First: exthdrs may take lots of space (~8K for now) | |
204 | MAX_HEADER is not enough. | |
205 | */ | |
206 | head_room = opt->opt_nflen + opt->opt_flen; | |
207 | seg_len += head_room; | |
208 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
209 | ||
210 | if (skb_headroom(skb) < head_room) { | |
211 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
a11d206d | 212 | if (skb2 == NULL) { |
adf30907 | 213 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
214 | IPSTATS_MIB_OUTDISCARDS); |
215 | kfree_skb(skb); | |
1da177e4 LT |
216 | return -ENOBUFS; |
217 | } | |
a11d206d YH |
218 | kfree_skb(skb); |
219 | skb = skb2; | |
1da177e4 LT |
220 | if (sk) |
221 | skb_set_owner_w(skb, sk); | |
222 | } | |
223 | if (opt->opt_flen) | |
224 | ipv6_push_frag_opts(skb, opt, &proto); | |
225 | if (opt->opt_nflen) | |
226 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
227 | } | |
228 | ||
e2d1bca7 ACM |
229 | skb_push(skb, sizeof(struct ipv6hdr)); |
230 | skb_reset_network_header(skb); | |
0660e03f | 231 | hdr = ipv6_hdr(skb); |
1da177e4 | 232 | |
77e2f14f WY |
233 | /* Allow local fragmentation. */ |
234 | if (ipfragok) | |
235 | skb->local_df = 1; | |
236 | ||
1da177e4 LT |
237 | /* |
238 | * Fill in the IPv6 header | |
239 | */ | |
240 | ||
1da177e4 LT |
241 | hlimit = -1; |
242 | if (np) | |
243 | hlimit = np->hop_limit; | |
244 | if (hlimit < 0) | |
6b75d090 | 245 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 246 | |
41a1f8ea YH |
247 | tclass = -1; |
248 | if (np) | |
249 | tclass = np->tclass; | |
250 | if (tclass < 0) | |
251 | tclass = 0; | |
252 | ||
90bcaf7b | 253 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel; |
41a1f8ea | 254 | |
1da177e4 LT |
255 | hdr->payload_len = htons(seg_len); |
256 | hdr->nexthdr = proto; | |
257 | hdr->hop_limit = hlimit; | |
258 | ||
259 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | |
260 | ipv6_addr_copy(&hdr->daddr, first_hop); | |
261 | ||
a2c2064f | 262 | skb->priority = sk->sk_priority; |
4a19ec58 | 263 | skb->mark = sk->sk_mark; |
a2c2064f | 264 | |
1da177e4 | 265 | mtu = dst_mtu(dst); |
283d07ac | 266 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
adf30907 | 267 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 268 | IPSTATS_MIB_OUT, skb->len); |
6e23ae2a | 269 | return NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6869c4d8 | 270 | dst_output); |
1da177e4 LT |
271 | } |
272 | ||
273 | if (net_ratelimit()) | |
274 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); | |
275 | skb->dev = dst->dev; | |
276 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); | |
adf30907 | 277 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
278 | kfree_skb(skb); |
279 | return -EMSGSIZE; | |
280 | } | |
281 | ||
7159039a YH |
282 | EXPORT_SYMBOL(ip6_xmit); |
283 | ||
1da177e4 LT |
284 | /* |
285 | * To avoid extra problems ND packets are send through this | |
286 | * routine. It's code duplication but I really want to avoid | |
287 | * extra checks since ipv6_build_header is used by TCP (which | |
288 | * is for us performance critical) | |
289 | */ | |
290 | ||
291 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, | |
9acd9f3a | 292 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
1da177e4 LT |
293 | int proto, int len) |
294 | { | |
295 | struct ipv6_pinfo *np = inet6_sk(sk); | |
296 | struct ipv6hdr *hdr; | |
297 | int totlen; | |
298 | ||
299 | skb->protocol = htons(ETH_P_IPV6); | |
300 | skb->dev = dev; | |
301 | ||
302 | totlen = len + sizeof(struct ipv6hdr); | |
303 | ||
55f79cc0 ACM |
304 | skb_reset_network_header(skb); |
305 | skb_put(skb, sizeof(struct ipv6hdr)); | |
0660e03f | 306 | hdr = ipv6_hdr(skb); |
1da177e4 | 307 | |
ae08e1f0 | 308 | *(__be32*)hdr = htonl(0x60000000); |
1da177e4 LT |
309 | |
310 | hdr->payload_len = htons(len); | |
311 | hdr->nexthdr = proto; | |
312 | hdr->hop_limit = np->hop_limit; | |
313 | ||
314 | ipv6_addr_copy(&hdr->saddr, saddr); | |
315 | ipv6_addr_copy(&hdr->daddr, daddr); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
321 | { | |
322 | struct ip6_ra_chain *ra; | |
323 | struct sock *last = NULL; | |
324 | ||
325 | read_lock(&ip6_ra_lock); | |
326 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
327 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
328 | if (sk && ra->sel == sel && |
329 | (!sk->sk_bound_dev_if || | |
330 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
331 | if (last) { |
332 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
333 | if (skb2) | |
334 | rawv6_rcv(last, skb2); | |
335 | } | |
336 | last = sk; | |
337 | } | |
338 | } | |
339 | ||
340 | if (last) { | |
341 | rawv6_rcv(last, skb); | |
342 | read_unlock(&ip6_ra_lock); | |
343 | return 1; | |
344 | } | |
345 | read_unlock(&ip6_ra_lock); | |
346 | return 0; | |
347 | } | |
348 | ||
e21e0b5f VN |
349 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
350 | { | |
0660e03f | 351 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f VN |
352 | u8 nexthdr = hdr->nexthdr; |
353 | int offset; | |
354 | ||
355 | if (ipv6_ext_hdr(nexthdr)) { | |
356 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr); | |
357 | if (offset < 0) | |
358 | return 0; | |
359 | } else | |
360 | offset = sizeof(struct ipv6hdr); | |
361 | ||
362 | if (nexthdr == IPPROTO_ICMPV6) { | |
363 | struct icmp6hdr *icmp6; | |
364 | ||
d56f90a7 ACM |
365 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
366 | offset + 1 - skb->data))) | |
e21e0b5f VN |
367 | return 0; |
368 | ||
d56f90a7 | 369 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
370 | |
371 | switch (icmp6->icmp6_type) { | |
372 | case NDISC_ROUTER_SOLICITATION: | |
373 | case NDISC_ROUTER_ADVERTISEMENT: | |
374 | case NDISC_NEIGHBOUR_SOLICITATION: | |
375 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
376 | case NDISC_REDIRECT: | |
377 | /* For reaction involving unicast neighbor discovery | |
378 | * message destined to the proxied address, pass it to | |
379 | * input function. | |
380 | */ | |
381 | return 1; | |
382 | default: | |
383 | break; | |
384 | } | |
385 | } | |
386 | ||
74553b09 VN |
387 | /* |
388 | * The proxying router can't forward traffic sent to a link-local | |
389 | * address, so signal the sender and discard the packet. This | |
390 | * behavior is clarified by the MIPv6 specification. | |
391 | */ | |
392 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
393 | dst_link_failure(skb); | |
394 | return -1; | |
395 | } | |
396 | ||
e21e0b5f VN |
397 | return 0; |
398 | } | |
399 | ||
1da177e4 LT |
400 | static inline int ip6_forward_finish(struct sk_buff *skb) |
401 | { | |
402 | return dst_output(skb); | |
403 | } | |
404 | ||
405 | int ip6_forward(struct sk_buff *skb) | |
406 | { | |
adf30907 | 407 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 408 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 409 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 410 | struct net *net = dev_net(dst->dev); |
1ab1457c | 411 | |
53b7997f | 412 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
413 | goto error; |
414 | ||
4497b076 BH |
415 | if (skb_warn_if_lro(skb)) |
416 | goto drop; | |
417 | ||
1da177e4 | 418 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
3bd653c8 | 419 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
420 | goto drop; |
421 | } | |
422 | ||
35fc92a9 | 423 | skb_forward_csum(skb); |
1da177e4 LT |
424 | |
425 | /* | |
426 | * We DO NOT make any processing on | |
427 | * RA packets, pushing them to user level AS IS | |
428 | * without ane WARRANTY that application will be able | |
429 | * to interpret them. The reason is that we | |
430 | * cannot make anything clever here. | |
431 | * | |
432 | * We are not end-node, so that if packet contains | |
433 | * AH/ESP, we cannot make anything. | |
434 | * Defragmentation also would be mistake, RA packets | |
435 | * cannot be fragmented, because there is no warranty | |
436 | * that different fragments will go along one path. --ANK | |
437 | */ | |
438 | if (opt->ra) { | |
d56f90a7 | 439 | u8 *ptr = skb_network_header(skb) + opt->ra; |
1da177e4 LT |
440 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
441 | return 0; | |
442 | } | |
443 | ||
444 | /* | |
445 | * check and decrement ttl | |
446 | */ | |
447 | if (hdr->hop_limit <= 1) { | |
448 | /* Force OUTPUT device used as source address */ | |
449 | skb->dev = dst->dev; | |
450 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
451 | 0, skb->dev); | |
483a47d2 DL |
452 | IP6_INC_STATS_BH(net, |
453 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
454 | |
455 | kfree_skb(skb); | |
456 | return -ETIMEDOUT; | |
457 | } | |
458 | ||
fbea49e1 | 459 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 460 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 461 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
462 | int proxied = ip6_forward_proxy_check(skb); |
463 | if (proxied > 0) | |
e21e0b5f | 464 | return ip6_input(skb); |
74553b09 | 465 | else if (proxied < 0) { |
3bd653c8 DL |
466 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
467 | IPSTATS_MIB_INDISCARDS); | |
74553b09 VN |
468 | goto drop; |
469 | } | |
e21e0b5f VN |
470 | } |
471 | ||
1da177e4 | 472 | if (!xfrm6_route_forward(skb)) { |
3bd653c8 | 473 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
474 | goto drop; |
475 | } | |
adf30907 | 476 | dst = skb_dst(skb); |
1da177e4 LT |
477 | |
478 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
479 | send redirects to source routed frames. | |
1e5dc146 | 480 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 481 | */ |
1e5dc146 | 482 | if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 && |
def8b4fa | 483 | !skb_sec_path(skb)) { |
1da177e4 LT |
484 | struct in6_addr *target = NULL; |
485 | struct rt6_info *rt; | |
486 | struct neighbour *n = dst->neighbour; | |
487 | ||
488 | /* | |
489 | * incoming and outgoing devices are the same | |
490 | * send a redirect. | |
491 | */ | |
492 | ||
493 | rt = (struct rt6_info *) dst; | |
494 | if ((rt->rt6i_flags & RTF_GATEWAY)) | |
495 | target = (struct in6_addr*)&n->primary_key; | |
496 | else | |
497 | target = &hdr->daddr; | |
498 | ||
499 | /* Limit redirects both by destination (here) | |
500 | and by source (inside ndisc_send_redirect) | |
501 | */ | |
502 | if (xrlim_allow(dst, 1*HZ)) | |
503 | ndisc_send_redirect(skb, n, target); | |
5bb1ab09 DS |
504 | } else { |
505 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
506 | ||
1da177e4 | 507 | /* This check is security critical. */ |
f81b2e7d YH |
508 | if (addrtype == IPV6_ADDR_ANY || |
509 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
510 | goto error; |
511 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
512 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
513 | ICMPV6_NOT_NEIGHBOUR, 0, skb->dev); | |
514 | goto error; | |
515 | } | |
1da177e4 LT |
516 | } |
517 | ||
518 | if (skb->len > dst_mtu(dst)) { | |
519 | /* Again, force OUTPUT device used as source address */ | |
520 | skb->dev = dst->dev; | |
521 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev); | |
483a47d2 DL |
522 | IP6_INC_STATS_BH(net, |
523 | ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); | |
524 | IP6_INC_STATS_BH(net, | |
525 | ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
526 | kfree_skb(skb); |
527 | return -EMSGSIZE; | |
528 | } | |
529 | ||
530 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
3bd653c8 | 531 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
532 | goto drop; |
533 | } | |
534 | ||
0660e03f | 535 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
536 | |
537 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 538 | |
1da177e4 LT |
539 | hdr->hop_limit--; |
540 | ||
483a47d2 | 541 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
6e23ae2a PM |
542 | return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
543 | ip6_forward_finish); | |
1da177e4 LT |
544 | |
545 | error: | |
483a47d2 | 546 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
547 | drop: |
548 | kfree_skb(skb); | |
549 | return -EINVAL; | |
550 | } | |
551 | ||
552 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
553 | { | |
554 | to->pkt_type = from->pkt_type; | |
555 | to->priority = from->priority; | |
556 | to->protocol = from->protocol; | |
adf30907 ED |
557 | skb_dst_drop(to); |
558 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 559 | to->dev = from->dev; |
82e91ffe | 560 | to->mark = from->mark; |
1da177e4 LT |
561 | |
562 | #ifdef CONFIG_NET_SCHED | |
563 | to->tc_index = from->tc_index; | |
564 | #endif | |
e7ac05f3 | 565 | nf_copy(to, from); |
ba9dda3a JK |
566 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
567 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
568 | to->nf_trace = from->nf_trace; | |
569 | #endif | |
984bc16c | 570 | skb_copy_secmark(to, from); |
1da177e4 LT |
571 | } |
572 | ||
573 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
574 | { | |
575 | u16 offset = sizeof(struct ipv6hdr); | |
0660e03f ACM |
576 | struct ipv6_opt_hdr *exthdr = |
577 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
27a884dc | 578 | unsigned int packet_len = skb->tail - skb->network_header; |
1da177e4 | 579 | int found_rhdr = 0; |
0660e03f | 580 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
1da177e4 LT |
581 | |
582 | while (offset + 1 <= packet_len) { | |
583 | ||
584 | switch (**nexthdr) { | |
585 | ||
586 | case NEXTHDR_HOP: | |
27637df9 | 587 | break; |
1da177e4 | 588 | case NEXTHDR_ROUTING: |
27637df9 MN |
589 | found_rhdr = 1; |
590 | break; | |
1da177e4 | 591 | case NEXTHDR_DEST: |
59fbb3a6 | 592 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
593 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
594 | break; | |
595 | #endif | |
596 | if (found_rhdr) | |
597 | return offset; | |
1da177e4 LT |
598 | break; |
599 | default : | |
600 | return offset; | |
601 | } | |
27637df9 MN |
602 | |
603 | offset += ipv6_optlen(exthdr); | |
604 | *nexthdr = &exthdr->nexthdr; | |
d56f90a7 ACM |
605 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
606 | offset); | |
1da177e4 LT |
607 | } |
608 | ||
609 | return offset; | |
610 | } | |
611 | ||
612 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) | |
613 | { | |
1da177e4 | 614 | struct sk_buff *frag; |
adf30907 | 615 | struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); |
d91675f9 | 616 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
617 | struct ipv6hdr *tmp_hdr; |
618 | struct frag_hdr *fh; | |
619 | unsigned int mtu, hlen, left, len; | |
ae08e1f0 | 620 | __be32 frag_id = 0; |
1da177e4 LT |
621 | int ptr, offset = 0, err=0; |
622 | u8 *prevhdr, nexthdr = 0; | |
adf30907 | 623 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 624 | |
1da177e4 LT |
625 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
626 | nexthdr = *prevhdr; | |
627 | ||
628a5c56 | 628 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
629 | |
630 | /* We must not fragment if the socket is set to force MTU discovery | |
631 | * or if the skb it not generated by a local socket. (This last | |
632 | * check should be redundant, but it's free.) | |
633 | */ | |
b5c15fc0 | 634 | if (!skb->local_df) { |
adf30907 | 635 | skb->dev = skb_dst(skb)->dev; |
b881ef76 | 636 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); |
adf30907 | 637 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 638 | IPSTATS_MIB_FRAGFAILS); |
b881ef76 JH |
639 | kfree_skb(skb); |
640 | return -EMSGSIZE; | |
641 | } | |
642 | ||
d91675f9 YH |
643 | if (np && np->frag_size < mtu) { |
644 | if (np->frag_size) | |
645 | mtu = np->frag_size; | |
646 | } | |
647 | mtu -= hlen + sizeof(struct frag_hdr); | |
1da177e4 | 648 | |
4d9092bb | 649 | if (skb_has_frags(skb)) { |
1da177e4 | 650 | int first_len = skb_pagelen(skb); |
29ffe1a5 | 651 | int truesizes = 0; |
1da177e4 LT |
652 | |
653 | if (first_len - hlen > mtu || | |
654 | ((first_len - hlen) & 7) || | |
655 | skb_cloned(skb)) | |
656 | goto slow_path; | |
657 | ||
4d9092bb | 658 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
659 | /* Correct geometry. */ |
660 | if (frag->len > mtu || | |
661 | ((frag->len & 7) && frag->next) || | |
662 | skb_headroom(frag) < hlen) | |
663 | goto slow_path; | |
664 | ||
1da177e4 LT |
665 | /* Partially cloned skb? */ |
666 | if (skb_shared(frag)) | |
667 | goto slow_path; | |
2fdba6b0 HX |
668 | |
669 | BUG_ON(frag->sk); | |
670 | if (skb->sk) { | |
2fdba6b0 HX |
671 | frag->sk = skb->sk; |
672 | frag->destructor = sock_wfree; | |
29ffe1a5 | 673 | truesizes += frag->truesize; |
2fdba6b0 | 674 | } |
1da177e4 LT |
675 | } |
676 | ||
677 | err = 0; | |
678 | offset = 0; | |
679 | frag = skb_shinfo(skb)->frag_list; | |
4d9092bb | 680 | skb_frag_list_init(skb); |
1da177e4 LT |
681 | /* BUILD HEADER */ |
682 | ||
9a217a1c | 683 | *prevhdr = NEXTHDR_FRAGMENT; |
d56f90a7 | 684 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
1da177e4 | 685 | if (!tmp_hdr) { |
adf30907 | 686 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 687 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
688 | return -ENOMEM; |
689 | } | |
690 | ||
1da177e4 LT |
691 | __skb_pull(skb, hlen); |
692 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
e2d1bca7 ACM |
693 | __skb_push(skb, hlen); |
694 | skb_reset_network_header(skb); | |
d56f90a7 | 695 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
1da177e4 | 696 | |
7ea2f2c5 | 697 | ipv6_select_ident(fh); |
1da177e4 LT |
698 | fh->nexthdr = nexthdr; |
699 | fh->reserved = 0; | |
700 | fh->frag_off = htons(IP6_MF); | |
701 | frag_id = fh->identification; | |
702 | ||
703 | first_len = skb_pagelen(skb); | |
704 | skb->data_len = first_len - skb_headlen(skb); | |
29ffe1a5 | 705 | skb->truesize -= truesizes; |
1da177e4 | 706 | skb->len = first_len; |
0660e03f ACM |
707 | ipv6_hdr(skb)->payload_len = htons(first_len - |
708 | sizeof(struct ipv6hdr)); | |
a11d206d YH |
709 | |
710 | dst_hold(&rt->u.dst); | |
1da177e4 LT |
711 | |
712 | for (;;) { | |
713 | /* Prepare header of the next frame, | |
714 | * before previous one went down. */ | |
715 | if (frag) { | |
716 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 717 | skb_reset_transport_header(frag); |
1da177e4 | 718 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
719 | __skb_push(frag, hlen); |
720 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
721 | memcpy(skb_network_header(frag), tmp_hdr, |
722 | hlen); | |
1da177e4 LT |
723 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
724 | fh->nexthdr = nexthdr; | |
725 | fh->reserved = 0; | |
726 | fh->frag_off = htons(offset); | |
727 | if (frag->next != NULL) | |
728 | fh->frag_off |= htons(IP6_MF); | |
729 | fh->identification = frag_id; | |
0660e03f ACM |
730 | ipv6_hdr(frag)->payload_len = |
731 | htons(frag->len - | |
732 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
733 | ip6_copy_metadata(frag, skb); |
734 | } | |
1ab1457c | 735 | |
1da177e4 | 736 | err = output(skb); |
dafee490 | 737 | if(!err) |
3bd653c8 DL |
738 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
739 | IPSTATS_MIB_FRAGCREATES); | |
dafee490 | 740 | |
1da177e4 LT |
741 | if (err || !frag) |
742 | break; | |
743 | ||
744 | skb = frag; | |
745 | frag = skb->next; | |
746 | skb->next = NULL; | |
747 | } | |
748 | ||
a51482bd | 749 | kfree(tmp_hdr); |
1da177e4 LT |
750 | |
751 | if (err == 0) { | |
3bd653c8 DL |
752 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
753 | IPSTATS_MIB_FRAGOKS); | |
a11d206d | 754 | dst_release(&rt->u.dst); |
1da177e4 LT |
755 | return 0; |
756 | } | |
757 | ||
758 | while (frag) { | |
759 | skb = frag->next; | |
760 | kfree_skb(frag); | |
761 | frag = skb; | |
762 | } | |
763 | ||
3bd653c8 DL |
764 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
765 | IPSTATS_MIB_FRAGFAILS); | |
a11d206d | 766 | dst_release(&rt->u.dst); |
1da177e4 LT |
767 | return err; |
768 | } | |
769 | ||
770 | slow_path: | |
771 | left = skb->len - hlen; /* Space per frame */ | |
772 | ptr = hlen; /* Where to start from */ | |
773 | ||
774 | /* | |
775 | * Fragment the datagram. | |
776 | */ | |
777 | ||
778 | *prevhdr = NEXTHDR_FRAGMENT; | |
779 | ||
780 | /* | |
781 | * Keep copying data until we run out. | |
782 | */ | |
783 | while(left > 0) { | |
784 | len = left; | |
785 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
786 | if (len > mtu) | |
787 | len = mtu; | |
788 | /* IF: we are not sending upto and including the packet end | |
789 | then align the next start on an eight byte boundary */ | |
790 | if (len < left) { | |
791 | len &= ~7; | |
792 | } | |
793 | /* | |
794 | * Allocate buffer. | |
795 | */ | |
796 | ||
f5184d26 | 797 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_ALLOCATED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) { |
64ce2073 | 798 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
adf30907 | 799 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 800 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
801 | err = -ENOMEM; |
802 | goto fail; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Set up data on packet | |
807 | */ | |
808 | ||
809 | ip6_copy_metadata(frag, skb); | |
810 | skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev)); | |
811 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); | |
c1d2bbe1 | 812 | skb_reset_network_header(frag); |
badff6d0 | 813 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
b0e380b1 ACM |
814 | frag->transport_header = (frag->network_header + hlen + |
815 | sizeof(struct frag_hdr)); | |
1da177e4 LT |
816 | |
817 | /* | |
818 | * Charge the memory for the fragment to any owner | |
819 | * it might possess | |
820 | */ | |
821 | if (skb->sk) | |
822 | skb_set_owner_w(frag, skb->sk); | |
823 | ||
824 | /* | |
825 | * Copy the packet header into the new buffer. | |
826 | */ | |
d626f62b | 827 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
1da177e4 LT |
828 | |
829 | /* | |
830 | * Build fragment header. | |
831 | */ | |
832 | fh->nexthdr = nexthdr; | |
833 | fh->reserved = 0; | |
f36d6ab1 | 834 | if (!frag_id) { |
7ea2f2c5 | 835 | ipv6_select_ident(fh); |
1da177e4 LT |
836 | frag_id = fh->identification; |
837 | } else | |
838 | fh->identification = frag_id; | |
839 | ||
840 | /* | |
841 | * Copy a block of the IP datagram. | |
842 | */ | |
8984e41d | 843 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
1da177e4 LT |
844 | BUG(); |
845 | left -= len; | |
846 | ||
847 | fh->frag_off = htons(offset); | |
848 | if (left > 0) | |
849 | fh->frag_off |= htons(IP6_MF); | |
0660e03f ACM |
850 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
851 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
852 | |
853 | ptr += len; | |
854 | offset += len; | |
855 | ||
856 | /* | |
857 | * Put this fragment into the sending queue. | |
858 | */ | |
1da177e4 LT |
859 | err = output(frag); |
860 | if (err) | |
861 | goto fail; | |
dafee490 | 862 | |
adf30907 | 863 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 864 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 865 | } |
adf30907 | 866 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 867 | IPSTATS_MIB_FRAGOKS); |
1da177e4 | 868 | kfree_skb(skb); |
1da177e4 LT |
869 | return err; |
870 | ||
871 | fail: | |
adf30907 | 872 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 873 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 874 | kfree_skb(skb); |
1da177e4 LT |
875 | return err; |
876 | } | |
877 | ||
cf6b1982 YH |
878 | static inline int ip6_rt_check(struct rt6key *rt_key, |
879 | struct in6_addr *fl_addr, | |
880 | struct in6_addr *addr_cache) | |
881 | { | |
882 | return ((rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && | |
883 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache))); | |
884 | } | |
885 | ||
497c615a HX |
886 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
887 | struct dst_entry *dst, | |
888 | struct flowi *fl) | |
1da177e4 | 889 | { |
497c615a HX |
890 | struct ipv6_pinfo *np = inet6_sk(sk); |
891 | struct rt6_info *rt = (struct rt6_info *)dst; | |
1da177e4 | 892 | |
497c615a HX |
893 | if (!dst) |
894 | goto out; | |
895 | ||
896 | /* Yes, checking route validity in not connected | |
897 | * case is not very simple. Take into account, | |
898 | * that we do not support routing by source, TOS, | |
899 | * and MSG_DONTROUTE --ANK (980726) | |
900 | * | |
cf6b1982 YH |
901 | * 1. ip6_rt_check(): If route was host route, |
902 | * check that cached destination is current. | |
497c615a HX |
903 | * If it is network route, we still may |
904 | * check its validity using saved pointer | |
905 | * to the last used address: daddr_cache. | |
906 | * We do not want to save whole address now, | |
907 | * (because main consumer of this service | |
908 | * is tcp, which has not this problem), | |
909 | * so that the last trick works only on connected | |
910 | * sockets. | |
911 | * 2. oif also should be the same. | |
912 | */ | |
cf6b1982 | 913 | if (ip6_rt_check(&rt->rt6i_dst, &fl->fl6_dst, np->daddr_cache) || |
8e1ef0a9 YH |
914 | #ifdef CONFIG_IPV6_SUBTREES |
915 | ip6_rt_check(&rt->rt6i_src, &fl->fl6_src, np->saddr_cache) || | |
916 | #endif | |
cf6b1982 | 917 | (fl->oif && fl->oif != dst->dev->ifindex)) { |
497c615a HX |
918 | dst_release(dst); |
919 | dst = NULL; | |
1da177e4 LT |
920 | } |
921 | ||
497c615a HX |
922 | out: |
923 | return dst; | |
924 | } | |
925 | ||
926 | static int ip6_dst_lookup_tail(struct sock *sk, | |
927 | struct dst_entry **dst, struct flowi *fl) | |
928 | { | |
929 | int err; | |
3b1e0a65 | 930 | struct net *net = sock_net(sk); |
497c615a | 931 | |
1da177e4 | 932 | if (*dst == NULL) |
8a3edd80 | 933 | *dst = ip6_route_output(net, sk, fl); |
1da177e4 LT |
934 | |
935 | if ((err = (*dst)->error)) | |
936 | goto out_err_release; | |
937 | ||
938 | if (ipv6_addr_any(&fl->fl6_src)) { | |
191cd582 | 939 | err = ipv6_dev_get_saddr(net, ip6_dst_idev(*dst)->dev, |
7cbca67c YH |
940 | &fl->fl6_dst, |
941 | sk ? inet6_sk(sk)->srcprefs : 0, | |
942 | &fl->fl6_src); | |
44456d37 | 943 | if (err) |
1da177e4 | 944 | goto out_err_release; |
1da177e4 LT |
945 | } |
946 | ||
95c385b4 | 947 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
948 | /* |
949 | * Here if the dst entry we've looked up | |
950 | * has a neighbour entry that is in the INCOMPLETE | |
951 | * state and the src address from the flow is | |
952 | * marked as OPTIMISTIC, we release the found | |
953 | * dst entry and replace it instead with the | |
954 | * dst entry of the nexthop router | |
955 | */ | |
956 | if ((*dst)->neighbour && !((*dst)->neighbour->nud_state & NUD_VALID)) { | |
957 | struct inet6_ifaddr *ifp; | |
958 | struct flowi fl_gw; | |
959 | int redirect; | |
960 | ||
961 | ifp = ipv6_get_ifaddr(net, &fl->fl6_src, | |
962 | (*dst)->dev, 1); | |
963 | ||
964 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
965 | if (ifp) | |
966 | in6_ifa_put(ifp); | |
967 | ||
968 | if (redirect) { | |
969 | /* | |
970 | * We need to get the dst entry for the | |
971 | * default router instead | |
972 | */ | |
973 | dst_release(*dst); | |
974 | memcpy(&fl_gw, fl, sizeof(struct flowi)); | |
975 | memset(&fl_gw.fl6_dst, 0, sizeof(struct in6_addr)); | |
976 | *dst = ip6_route_output(net, sk, &fl_gw); | |
977 | if ((err = (*dst)->error)) | |
978 | goto out_err_release; | |
95c385b4 | 979 | } |
e550dfb0 | 980 | } |
95c385b4 NH |
981 | #endif |
982 | ||
1da177e4 LT |
983 | return 0; |
984 | ||
985 | out_err_release: | |
ca46f9c8 | 986 | if (err == -ENETUNREACH) |
483a47d2 | 987 | IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
988 | dst_release(*dst); |
989 | *dst = NULL; | |
990 | return err; | |
991 | } | |
34a0b3cd | 992 | |
497c615a HX |
993 | /** |
994 | * ip6_dst_lookup - perform route lookup on flow | |
995 | * @sk: socket which provides route info | |
996 | * @dst: pointer to dst_entry * for result | |
997 | * @fl: flow to lookup | |
998 | * | |
999 | * This function performs a route lookup on the given flow. | |
1000 | * | |
1001 | * It returns zero on success, or a standard errno code on error. | |
1002 | */ | |
1003 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) | |
1004 | { | |
1005 | *dst = NULL; | |
1006 | return ip6_dst_lookup_tail(sk, dst, fl); | |
1007 | } | |
3cf3dc6c ACM |
1008 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
1009 | ||
497c615a HX |
1010 | /** |
1011 | * ip6_sk_dst_lookup - perform socket cached route lookup on flow | |
1012 | * @sk: socket which provides the dst cache and route info | |
1013 | * @dst: pointer to dst_entry * for result | |
1014 | * @fl: flow to lookup | |
1015 | * | |
1016 | * This function performs a route lookup on the given flow with the | |
1017 | * possibility of using the cached route in the socket if it is valid. | |
1018 | * It will take the socket dst lock when operating on the dst cache. | |
1019 | * As a result, this function can only be used in process context. | |
1020 | * | |
1021 | * It returns zero on success, or a standard errno code on error. | |
1022 | */ | |
1023 | int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) | |
1024 | { | |
1025 | *dst = NULL; | |
1026 | if (sk) { | |
1027 | *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); | |
1028 | *dst = ip6_sk_dst_check(sk, *dst, fl); | |
1029 | } | |
1030 | ||
1031 | return ip6_dst_lookup_tail(sk, dst, fl); | |
1032 | } | |
1033 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup); | |
1034 | ||
34a0b3cd | 1035 | static inline int ip6_ufo_append_data(struct sock *sk, |
e89e9cf5 AR |
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 | ||
1041 | { | |
1042 | struct sk_buff *skb; | |
1043 | int err; | |
1044 | ||
1045 | /* There is support for UDP large send offload by network | |
1046 | * device, so create one single skb packet containing complete | |
1047 | * udp datagram | |
1048 | */ | |
1049 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
1050 | skb = sock_alloc_send_skb(sk, | |
1051 | hh_len + fragheaderlen + transhdrlen + 20, | |
1052 | (flags & MSG_DONTWAIT), &err); | |
1053 | if (skb == NULL) | |
1054 | return -ENOMEM; | |
1055 | ||
1056 | /* reserve space for Hardware header */ | |
1057 | skb_reserve(skb, hh_len); | |
1058 | ||
1059 | /* create space for UDP/IP header */ | |
1060 | skb_put(skb,fragheaderlen + transhdrlen); | |
1061 | ||
1062 | /* initialize network header pointer */ | |
c1d2bbe1 | 1063 | skb_reset_network_header(skb); |
e89e9cf5 AR |
1064 | |
1065 | /* initialize protocol header pointer */ | |
b0e380b1 | 1066 | skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf5 | 1067 | |
84fa7933 | 1068 | skb->ip_summed = CHECKSUM_PARTIAL; |
e89e9cf5 AR |
1069 | skb->csum = 0; |
1070 | sk->sk_sndmsg_off = 0; | |
1071 | } | |
1072 | ||
1073 | err = skb_append_datato_frags(sk,skb, getfrag, from, | |
1074 | (length - transhdrlen)); | |
1075 | if (!err) { | |
1076 | struct frag_hdr fhdr; | |
1077 | ||
c31d5326 SS |
1078 | /* Specify the length of each IPv6 datagram fragment. |
1079 | * It has to be a multiple of 8. | |
1080 | */ | |
1081 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - | |
1082 | sizeof(struct frag_hdr)) & ~7; | |
f83ef8c0 | 1083 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
7ea2f2c5 | 1084 | ipv6_select_ident(&fhdr); |
e89e9cf5 AR |
1085 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; |
1086 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | /* There is not enough support do UPD LSO, | |
1091 | * so follow normal path | |
1092 | */ | |
1093 | kfree_skb(skb); | |
1094 | ||
1095 | return err; | |
1096 | } | |
1da177e4 | 1097 | |
0178b695 HX |
1098 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1099 | gfp_t gfp) | |
1100 | { | |
1101 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1102 | } | |
1103 | ||
1104 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1105 | gfp_t gfp) | |
1106 | { | |
1107 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1108 | } | |
1109 | ||
41a1f8ea YH |
1110 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
1111 | int offset, int len, int odd, struct sk_buff *skb), | |
1112 | void *from, int length, int transhdrlen, | |
1113 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl, | |
1114 | struct rt6_info *rt, unsigned int flags) | |
1da177e4 LT |
1115 | { |
1116 | struct inet_sock *inet = inet_sk(sk); | |
1117 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1118 | struct sk_buff *skb; | |
1119 | unsigned int maxfraglen, fragheaderlen; | |
1120 | int exthdrlen; | |
1121 | int hh_len; | |
1122 | int mtu; | |
1123 | int copy; | |
1124 | int err; | |
1125 | int offset = 0; | |
1126 | int csummode = CHECKSUM_NONE; | |
1127 | ||
1128 | if (flags&MSG_PROBE) | |
1129 | return 0; | |
1130 | if (skb_queue_empty(&sk->sk_write_queue)) { | |
1131 | /* | |
1132 | * setup for corking | |
1133 | */ | |
1134 | if (opt) { | |
0178b695 | 1135 | if (WARN_ON(np->cork.opt)) |
1da177e4 | 1136 | return -EINVAL; |
0178b695 HX |
1137 | |
1138 | np->cork.opt = kmalloc(opt->tot_len, sk->sk_allocation); | |
1139 | if (unlikely(np->cork.opt == NULL)) | |
1140 | return -ENOBUFS; | |
1141 | ||
1142 | np->cork.opt->tot_len = opt->tot_len; | |
1143 | np->cork.opt->opt_flen = opt->opt_flen; | |
1144 | np->cork.opt->opt_nflen = opt->opt_nflen; | |
1145 | ||
1146 | np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
1147 | sk->sk_allocation); | |
1148 | if (opt->dst0opt && !np->cork.opt->dst0opt) | |
1149 | return -ENOBUFS; | |
1150 | ||
1151 | np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
1152 | sk->sk_allocation); | |
1153 | if (opt->dst1opt && !np->cork.opt->dst1opt) | |
1154 | return -ENOBUFS; | |
1155 | ||
1156 | np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt, | |
1157 | sk->sk_allocation); | |
1158 | if (opt->hopopt && !np->cork.opt->hopopt) | |
1159 | return -ENOBUFS; | |
1160 | ||
1161 | np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
1162 | sk->sk_allocation); | |
1163 | if (opt->srcrt && !np->cork.opt->srcrt) | |
1164 | return -ENOBUFS; | |
1165 | ||
1da177e4 LT |
1166 | /* need source address above miyazawa*/ |
1167 | } | |
1168 | dst_hold(&rt->u.dst); | |
c8cdaf99 | 1169 | inet->cork.dst = &rt->u.dst; |
1da177e4 LT |
1170 | inet->cork.fl = *fl; |
1171 | np->cork.hop_limit = hlimit; | |
41a1f8ea | 1172 | np->cork.tclass = tclass; |
628a5c56 JH |
1173 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? |
1174 | rt->u.dst.dev->mtu : dst_mtu(rt->u.dst.path); | |
c7503609 | 1175 | if (np->frag_size < mtu) { |
d91675f9 YH |
1176 | if (np->frag_size) |
1177 | mtu = np->frag_size; | |
1178 | } | |
1179 | inet->cork.fragsize = mtu; | |
1da177e4 LT |
1180 | if (dst_allfrag(rt->u.dst.path)) |
1181 | inet->cork.flags |= IPCORK_ALLFRAG; | |
1182 | inet->cork.length = 0; | |
1183 | sk->sk_sndmsg_page = NULL; | |
1184 | sk->sk_sndmsg_off = 0; | |
01488942 | 1185 | exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0) - |
a1b05140 | 1186 | rt->rt6i_nfheader_len; |
1da177e4 LT |
1187 | length += exthdrlen; |
1188 | transhdrlen += exthdrlen; | |
1189 | } else { | |
c8cdaf99 | 1190 | rt = (struct rt6_info *)inet->cork.dst; |
1da177e4 | 1191 | fl = &inet->cork.fl; |
0178b695 | 1192 | opt = np->cork.opt; |
1da177e4 LT |
1193 | transhdrlen = 0; |
1194 | exthdrlen = 0; | |
1195 | mtu = inet->cork.fragsize; | |
1196 | } | |
1197 | ||
1198 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); | |
1199 | ||
a1b05140 | 1200 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1201 | (opt ? opt->opt_nflen : 0); |
1da177e4 LT |
1202 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); |
1203 | ||
1204 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
1205 | if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { | |
1206 | ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen); | |
1207 | return -EMSGSIZE; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * Let's try using as much space as possible. | |
1213 | * Use MTU if total length of the message fits into the MTU. | |
1214 | * Otherwise, we need to reserve fragment header and | |
1215 | * fragment alignment (= 8-15 octects, in total). | |
1216 | * | |
1217 | * Note that we may need to "move" the data from the tail of | |
1ab1457c | 1218 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1219 | * the message. |
1220 | * | |
1ab1457c | 1221 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1222 | * at once if non-fragmentable extension headers |
1223 | * are too large. | |
1ab1457c | 1224 | * --yoshfuji |
1da177e4 LT |
1225 | */ |
1226 | ||
1227 | inet->cork.length += length; | |
e89e9cf5 AR |
1228 | if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) && |
1229 | (rt->u.dst.dev->features & NETIF_F_UFO)) { | |
1230 | ||
baa829d8 PM |
1231 | err = ip6_ufo_append_data(sk, getfrag, from, length, hh_len, |
1232 | fragheaderlen, transhdrlen, mtu, | |
1233 | flags); | |
1234 | if (err) | |
e89e9cf5 | 1235 | goto error; |
e89e9cf5 AR |
1236 | return 0; |
1237 | } | |
1da177e4 LT |
1238 | |
1239 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) | |
1240 | goto alloc_new_skb; | |
1241 | ||
1242 | while (length > 0) { | |
1243 | /* Check if the remaining data fits into current packet. */ | |
1244 | copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; | |
1245 | if (copy < length) | |
1246 | copy = maxfraglen - skb->len; | |
1247 | ||
1248 | if (copy <= 0) { | |
1249 | char *data; | |
1250 | unsigned int datalen; | |
1251 | unsigned int fraglen; | |
1252 | unsigned int fraggap; | |
1253 | unsigned int alloclen; | |
1254 | struct sk_buff *skb_prev; | |
1255 | alloc_new_skb: | |
1256 | skb_prev = skb; | |
1257 | ||
1258 | /* There's no room in the current skb */ | |
1259 | if (skb_prev) | |
1260 | fraggap = skb_prev->len - maxfraglen; | |
1261 | else | |
1262 | fraggap = 0; | |
1263 | ||
1264 | /* | |
1265 | * If remaining data exceeds the mtu, | |
1266 | * we know we need more fragment(s). | |
1267 | */ | |
1268 | datalen = length + fraggap; | |
1269 | if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) | |
1270 | datalen = maxfraglen - fragheaderlen; | |
1271 | ||
1272 | fraglen = datalen + fragheaderlen; | |
1273 | if ((flags & MSG_MORE) && | |
1274 | !(rt->u.dst.dev->features&NETIF_F_SG)) | |
1275 | alloclen = mtu; | |
1276 | else | |
1277 | alloclen = datalen + fragheaderlen; | |
1278 | ||
1279 | /* | |
1280 | * The last fragment gets additional space at tail. | |
1281 | * Note: we overallocate on fragments with MSG_MODE | |
1282 | * because we have no idea if we're the last one. | |
1283 | */ | |
1284 | if (datalen == length + fraggap) | |
1285 | alloclen += rt->u.dst.trailer_len; | |
1286 | ||
1287 | /* | |
1288 | * We just reserve space for fragment header. | |
1ab1457c | 1289 | * Note: this may be overallocation if the message |
1da177e4 LT |
1290 | * (without MSG_MORE) fits into the MTU. |
1291 | */ | |
1292 | alloclen += sizeof(struct frag_hdr); | |
1293 | ||
1294 | if (transhdrlen) { | |
1295 | skb = sock_alloc_send_skb(sk, | |
1296 | alloclen + hh_len, | |
1297 | (flags & MSG_DONTWAIT), &err); | |
1298 | } else { | |
1299 | skb = NULL; | |
1300 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1301 | 2 * sk->sk_sndbuf) | |
1302 | skb = sock_wmalloc(sk, | |
1303 | alloclen + hh_len, 1, | |
1304 | sk->sk_allocation); | |
1305 | if (unlikely(skb == NULL)) | |
1306 | err = -ENOBUFS; | |
1307 | } | |
1308 | if (skb == NULL) | |
1309 | goto error; | |
1310 | /* | |
1311 | * Fill in the control structures | |
1312 | */ | |
1313 | skb->ip_summed = csummode; | |
1314 | skb->csum = 0; | |
1315 | /* reserve for fragmentation */ | |
1316 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); | |
1317 | ||
1318 | /* | |
1319 | * Find where to start putting bytes | |
1320 | */ | |
1321 | data = skb_put(skb, fraglen); | |
c14d2450 | 1322 | skb_set_network_header(skb, exthdrlen); |
1da177e4 | 1323 | data += fragheaderlen; |
b0e380b1 ACM |
1324 | skb->transport_header = (skb->network_header + |
1325 | fragheaderlen); | |
1da177e4 LT |
1326 | if (fraggap) { |
1327 | skb->csum = skb_copy_and_csum_bits( | |
1328 | skb_prev, maxfraglen, | |
1329 | data + transhdrlen, fraggap, 0); | |
1330 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1331 | skb->csum); | |
1332 | data += fraggap; | |
e9fa4f7b | 1333 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1334 | } |
1335 | copy = datalen - transhdrlen - fraggap; | |
1336 | if (copy < 0) { | |
1337 | err = -EINVAL; | |
1338 | kfree_skb(skb); | |
1339 | goto error; | |
1340 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1341 | err = -EFAULT; | |
1342 | kfree_skb(skb); | |
1343 | goto error; | |
1344 | } | |
1345 | ||
1346 | offset += copy; | |
1347 | length -= datalen - fraggap; | |
1348 | transhdrlen = 0; | |
1349 | exthdrlen = 0; | |
1350 | csummode = CHECKSUM_NONE; | |
1351 | ||
1352 | /* | |
1353 | * Put the packet on the pending queue | |
1354 | */ | |
1355 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1356 | continue; | |
1357 | } | |
1358 | ||
1359 | if (copy > length) | |
1360 | copy = length; | |
1361 | ||
1362 | if (!(rt->u.dst.dev->features&NETIF_F_SG)) { | |
1363 | unsigned int off; | |
1364 | ||
1365 | off = skb->len; | |
1366 | if (getfrag(from, skb_put(skb, copy), | |
1367 | offset, copy, off, skb) < 0) { | |
1368 | __skb_trim(skb, off); | |
1369 | err = -EFAULT; | |
1370 | goto error; | |
1371 | } | |
1372 | } else { | |
1373 | int i = skb_shinfo(skb)->nr_frags; | |
1374 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | |
1375 | struct page *page = sk->sk_sndmsg_page; | |
1376 | int off = sk->sk_sndmsg_off; | |
1377 | unsigned int left; | |
1378 | ||
1379 | if (page && (left = PAGE_SIZE - off) > 0) { | |
1380 | if (copy >= left) | |
1381 | copy = left; | |
1382 | if (page != frag->page) { | |
1383 | if (i == MAX_SKB_FRAGS) { | |
1384 | err = -EMSGSIZE; | |
1385 | goto error; | |
1386 | } | |
1387 | get_page(page); | |
1388 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); | |
1389 | frag = &skb_shinfo(skb)->frags[i]; | |
1390 | } | |
1391 | } else if(i < MAX_SKB_FRAGS) { | |
1392 | if (copy > PAGE_SIZE) | |
1393 | copy = PAGE_SIZE; | |
1394 | page = alloc_pages(sk->sk_allocation, 0); | |
1395 | if (page == NULL) { | |
1396 | err = -ENOMEM; | |
1397 | goto error; | |
1398 | } | |
1399 | sk->sk_sndmsg_page = page; | |
1400 | sk->sk_sndmsg_off = 0; | |
1401 | ||
1402 | skb_fill_page_desc(skb, i, page, 0, 0); | |
1403 | frag = &skb_shinfo(skb)->frags[i]; | |
1da177e4 LT |
1404 | } else { |
1405 | err = -EMSGSIZE; | |
1406 | goto error; | |
1407 | } | |
1408 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { | |
1409 | err = -EFAULT; | |
1410 | goto error; | |
1411 | } | |
1412 | sk->sk_sndmsg_off += copy; | |
1413 | frag->size += copy; | |
1414 | skb->len += copy; | |
1415 | skb->data_len += copy; | |
f945fa7a HX |
1416 | skb->truesize += copy; |
1417 | atomic_add(copy, &sk->sk_wmem_alloc); | |
1da177e4 LT |
1418 | } |
1419 | offset += copy; | |
1420 | length -= copy; | |
1421 | } | |
1422 | return 0; | |
1423 | error: | |
1424 | inet->cork.length -= length; | |
3bd653c8 | 1425 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1426 | return err; |
1427 | } | |
1428 | ||
bf138862 PE |
1429 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
1430 | { | |
0178b695 HX |
1431 | if (np->cork.opt) { |
1432 | kfree(np->cork.opt->dst0opt); | |
1433 | kfree(np->cork.opt->dst1opt); | |
1434 | kfree(np->cork.opt->hopopt); | |
1435 | kfree(np->cork.opt->srcrt); | |
1436 | kfree(np->cork.opt); | |
1437 | np->cork.opt = NULL; | |
1438 | } | |
1439 | ||
c8cdaf99 YH |
1440 | if (inet->cork.dst) { |
1441 | dst_release(inet->cork.dst); | |
1442 | inet->cork.dst = NULL; | |
bf138862 PE |
1443 | inet->cork.flags &= ~IPCORK_ALLFRAG; |
1444 | } | |
1445 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1446 | } | |
1447 | ||
1da177e4 LT |
1448 | int ip6_push_pending_frames(struct sock *sk) |
1449 | { | |
1450 | struct sk_buff *skb, *tmp_skb; | |
1451 | struct sk_buff **tail_skb; | |
1452 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1453 | struct inet_sock *inet = inet_sk(sk); | |
1454 | struct ipv6_pinfo *np = inet6_sk(sk); | |
3bd653c8 | 1455 | struct net *net = sock_net(sk); |
1da177e4 LT |
1456 | struct ipv6hdr *hdr; |
1457 | struct ipv6_txoptions *opt = np->cork.opt; | |
c8cdaf99 | 1458 | struct rt6_info *rt = (struct rt6_info *)inet->cork.dst; |
1da177e4 LT |
1459 | struct flowi *fl = &inet->cork.fl; |
1460 | unsigned char proto = fl->proto; | |
1461 | int err = 0; | |
1462 | ||
1463 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1464 | goto out; | |
1465 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1466 | ||
1467 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1468 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1469 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1470 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
cfe1fc77 | 1471 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1472 | *tail_skb = tmp_skb; |
1473 | tail_skb = &(tmp_skb->next); | |
1474 | skb->len += tmp_skb->len; | |
1475 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1476 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1477 | tmp_skb->destructor = NULL; |
1478 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1479 | } |
1480 | ||
28a89453 | 1481 | /* Allow local fragmentation. */ |
b5c15fc0 | 1482 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
28a89453 HX |
1483 | skb->local_df = 1; |
1484 | ||
1da177e4 | 1485 | ipv6_addr_copy(final_dst, &fl->fl6_dst); |
cfe1fc77 | 1486 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1487 | if (opt && opt->opt_flen) |
1488 | ipv6_push_frag_opts(skb, opt, &proto); | |
1489 | if (opt && opt->opt_nflen) | |
1490 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1491 | ||
e2d1bca7 ACM |
1492 | skb_push(skb, sizeof(struct ipv6hdr)); |
1493 | skb_reset_network_header(skb); | |
0660e03f | 1494 | hdr = ipv6_hdr(skb); |
1ab1457c | 1495 | |
90bcaf7b | 1496 | *(__be32*)hdr = fl->fl6_flowlabel | |
41a1f8ea | 1497 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
1da177e4 | 1498 | |
1da177e4 LT |
1499 | hdr->hop_limit = np->cork.hop_limit; |
1500 | hdr->nexthdr = proto; | |
1501 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | |
1502 | ipv6_addr_copy(&hdr->daddr, final_dst); | |
1503 | ||
a2c2064f | 1504 | skb->priority = sk->sk_priority; |
4a19ec58 | 1505 | skb->mark = sk->sk_mark; |
a2c2064f | 1506 | |
adf30907 | 1507 | skb_dst_set(skb, dst_clone(&rt->u.dst)); |
edf391ff | 1508 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1509 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1510 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1511 | |
5a57d4c7 | 1512 | ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); |
e41b5368 | 1513 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); |
14878f75 DS |
1514 | } |
1515 | ||
ef76bc23 | 1516 | err = ip6_local_out(skb); |
1da177e4 LT |
1517 | if (err) { |
1518 | if (err > 0) | |
3320da89 | 1519 | err = np->recverr ? net_xmit_errno(err) : 0; |
1da177e4 LT |
1520 | if (err) |
1521 | goto error; | |
1522 | } | |
1523 | ||
1524 | out: | |
bf138862 | 1525 | ip6_cork_release(inet, np); |
1da177e4 LT |
1526 | return err; |
1527 | error: | |
1528 | goto out; | |
1529 | } | |
1530 | ||
1531 | void ip6_flush_pending_frames(struct sock *sk) | |
1532 | { | |
1da177e4 LT |
1533 | struct sk_buff *skb; |
1534 | ||
1535 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
adf30907 ED |
1536 | if (skb_dst(skb)) |
1537 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1538 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1539 | kfree_skb(skb); |
1540 | } | |
1541 | ||
bf138862 | 1542 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
1da177e4 | 1543 | } |