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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> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 LT |
41 | |
42 | #include <linux/netfilter.h> | |
43 | #include <linux/netfilter_ipv6.h> | |
44 | ||
45 | #include <net/sock.h> | |
46 | #include <net/snmp.h> | |
47 | ||
48 | #include <net/ipv6.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/protocol.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/addrconf.h> | |
53 | #include <net/rawv6.h> | |
54 | #include <net/icmp.h> | |
55 | #include <net/xfrm.h> | |
56 | #include <net/checksum.h> | |
7bc570c8 | 57 | #include <linux/mroute6.h> |
1da177e4 | 58 | |
ad0081e4 | 59 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
1da177e4 | 60 | |
ef76bc23 HX |
61 | int __ip6_local_out(struct sk_buff *skb) |
62 | { | |
63 | int len; | |
64 | ||
65 | len = skb->len - sizeof(struct ipv6hdr); | |
66 | if (len > IPV6_MAXPLEN) | |
67 | len = 0; | |
68 | ipv6_hdr(skb)->payload_len = htons(len); | |
69 | ||
b2e0b385 JE |
70 | return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
71 | skb_dst(skb)->dev, dst_output); | |
ef76bc23 HX |
72 | } |
73 | ||
74 | int ip6_local_out(struct sk_buff *skb) | |
75 | { | |
76 | int err; | |
77 | ||
78 | err = __ip6_local_out(skb); | |
79 | if (likely(err == 1)) | |
80 | err = dst_output(skb); | |
81 | ||
82 | return err; | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(ip6_local_out); | |
85 | ||
9e508490 | 86 | static int ip6_finish_output2(struct sk_buff *skb) |
1da177e4 | 87 | { |
adf30907 | 88 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 89 | struct net_device *dev = dst->dev; |
f6b72b62 | 90 | struct neighbour *neigh; |
1da177e4 LT |
91 | |
92 | skb->protocol = htons(ETH_P_IPV6); | |
93 | skb->dev = dev; | |
94 | ||
0660e03f | 95 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
adf30907 | 96 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
1da177e4 | 97 | |
7ad6848c | 98 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) && |
d1db275d | 99 | ((mroute6_socket(dev_net(dev), skb) && |
bd91b8bf | 100 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
7bc570c8 YH |
101 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
102 | &ipv6_hdr(skb)->saddr))) { | |
1da177e4 LT |
103 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
104 | ||
105 | /* Do not check for IFF_ALLMULTI; multicast routing | |
106 | is not supported in any case. | |
107 | */ | |
108 | if (newskb) | |
b2e0b385 JE |
109 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
110 | newskb, NULL, newskb->dev, | |
95603e22 | 111 | dev_loopback_xmit); |
1da177e4 | 112 | |
0660e03f | 113 | if (ipv6_hdr(skb)->hop_limit == 0) { |
3bd653c8 DL |
114 | IP6_INC_STATS(dev_net(dev), idev, |
115 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
116 | kfree_skb(skb); |
117 | return 0; | |
118 | } | |
119 | } | |
120 | ||
edf391ff NH |
121 | IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST, |
122 | skb->len); | |
1da177e4 LT |
123 | } |
124 | ||
f2c31e32 | 125 | rcu_read_lock(); |
27217455 | 126 | neigh = dst_get_neighbour_noref(dst); |
f2c31e32 | 127 | if (neigh) { |
5110effe | 128 | int res = dst_neigh_output(dst, neigh, skb); |
05e3aa09 | 129 | |
f2c31e32 ED |
130 | rcu_read_unlock(); |
131 | return res; | |
132 | } | |
133 | rcu_read_unlock(); | |
9e508490 JE |
134 | IP6_INC_STATS_BH(dev_net(dst->dev), |
135 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
136 | kfree_skb(skb); | |
137 | return -EINVAL; | |
1da177e4 LT |
138 | } |
139 | ||
9e508490 JE |
140 | static int ip6_finish_output(struct sk_buff *skb) |
141 | { | |
142 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || | |
143 | dst_allfrag(skb_dst(skb))) | |
144 | return ip6_fragment(skb, ip6_finish_output2); | |
145 | else | |
146 | return ip6_finish_output2(skb); | |
147 | } | |
148 | ||
1da177e4 LT |
149 | int ip6_output(struct sk_buff *skb) |
150 | { | |
9e508490 | 151 | struct net_device *dev = skb_dst(skb)->dev; |
adf30907 | 152 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
778d80be | 153 | if (unlikely(idev->cnf.disable_ipv6)) { |
9e508490 | 154 | IP6_INC_STATS(dev_net(dev), idev, |
3bd653c8 | 155 | IPSTATS_MIB_OUTDISCARDS); |
778d80be YH |
156 | kfree_skb(skb); |
157 | return 0; | |
158 | } | |
159 | ||
9c6eb28a JE |
160 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev, |
161 | ip6_finish_output, | |
162 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1da177e4 LT |
163 | } |
164 | ||
1da177e4 | 165 | /* |
b5d43998 | 166 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
1da177e4 LT |
167 | */ |
168 | ||
4c9483b2 | 169 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
b903d324 | 170 | struct ipv6_txoptions *opt, int tclass) |
1da177e4 | 171 | { |
3bd653c8 | 172 | struct net *net = sock_net(sk); |
b30bd282 | 173 | struct ipv6_pinfo *np = inet6_sk(sk); |
4c9483b2 | 174 | struct in6_addr *first_hop = &fl6->daddr; |
adf30907 | 175 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 176 | struct ipv6hdr *hdr; |
4c9483b2 | 177 | u8 proto = fl6->flowi6_proto; |
1da177e4 | 178 | int seg_len = skb->len; |
e651f03a | 179 | int hlimit = -1; |
1da177e4 LT |
180 | u32 mtu; |
181 | ||
182 | if (opt) { | |
c2636b4d | 183 | unsigned int head_room; |
1da177e4 LT |
184 | |
185 | /* First: exthdrs may take lots of space (~8K for now) | |
186 | MAX_HEADER is not enough. | |
187 | */ | |
188 | head_room = opt->opt_nflen + opt->opt_flen; | |
189 | seg_len += head_room; | |
190 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
191 | ||
192 | if (skb_headroom(skb) < head_room) { | |
193 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
a11d206d | 194 | if (skb2 == NULL) { |
adf30907 | 195 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
196 | IPSTATS_MIB_OUTDISCARDS); |
197 | kfree_skb(skb); | |
1da177e4 LT |
198 | return -ENOBUFS; |
199 | } | |
808db80a | 200 | consume_skb(skb); |
a11d206d | 201 | skb = skb2; |
83d7eb29 | 202 | skb_set_owner_w(skb, sk); |
1da177e4 LT |
203 | } |
204 | if (opt->opt_flen) | |
205 | ipv6_push_frag_opts(skb, opt, &proto); | |
206 | if (opt->opt_nflen) | |
207 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
208 | } | |
209 | ||
e2d1bca7 ACM |
210 | skb_push(skb, sizeof(struct ipv6hdr)); |
211 | skb_reset_network_header(skb); | |
0660e03f | 212 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
213 | |
214 | /* | |
215 | * Fill in the IPv6 header | |
216 | */ | |
b903d324 | 217 | if (np) |
1da177e4 LT |
218 | hlimit = np->hop_limit; |
219 | if (hlimit < 0) | |
6b75d090 | 220 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 221 | |
4c9483b2 | 222 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl6->flowlabel; |
41a1f8ea | 223 | |
1da177e4 LT |
224 | hdr->payload_len = htons(seg_len); |
225 | hdr->nexthdr = proto; | |
226 | hdr->hop_limit = hlimit; | |
227 | ||
4e3fd7a0 AD |
228 | hdr->saddr = fl6->saddr; |
229 | hdr->daddr = *first_hop; | |
1da177e4 | 230 | |
a2c2064f | 231 | skb->priority = sk->sk_priority; |
4a19ec58 | 232 | skb->mark = sk->sk_mark; |
a2c2064f | 233 | |
1da177e4 | 234 | mtu = dst_mtu(dst); |
283d07ac | 235 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
adf30907 | 236 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 237 | IPSTATS_MIB_OUT, skb->len); |
b2e0b385 JE |
238 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
239 | dst->dev, dst_output); | |
1da177e4 LT |
240 | } |
241 | ||
e87cc472 | 242 | net_dbg_ratelimited("IPv6: sending pkt_too_big to self\n"); |
1da177e4 | 243 | skb->dev = dst->dev; |
3ffe533c | 244 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 245 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
246 | kfree_skb(skb); |
247 | return -EMSGSIZE; | |
248 | } | |
249 | ||
7159039a YH |
250 | EXPORT_SYMBOL(ip6_xmit); |
251 | ||
1da177e4 LT |
252 | /* |
253 | * To avoid extra problems ND packets are send through this | |
254 | * routine. It's code duplication but I really want to avoid | |
255 | * extra checks since ipv6_build_header is used by TCP (which | |
256 | * is for us performance critical) | |
257 | */ | |
258 | ||
259 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, | |
9acd9f3a | 260 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
1da177e4 LT |
261 | int proto, int len) |
262 | { | |
263 | struct ipv6_pinfo *np = inet6_sk(sk); | |
264 | struct ipv6hdr *hdr; | |
1da177e4 LT |
265 | |
266 | skb->protocol = htons(ETH_P_IPV6); | |
267 | skb->dev = dev; | |
268 | ||
55f79cc0 ACM |
269 | skb_reset_network_header(skb); |
270 | skb_put(skb, sizeof(struct ipv6hdr)); | |
0660e03f | 271 | hdr = ipv6_hdr(skb); |
1da177e4 | 272 | |
ae08e1f0 | 273 | *(__be32*)hdr = htonl(0x60000000); |
1da177e4 LT |
274 | |
275 | hdr->payload_len = htons(len); | |
276 | hdr->nexthdr = proto; | |
277 | hdr->hop_limit = np->hop_limit; | |
278 | ||
4e3fd7a0 AD |
279 | hdr->saddr = *saddr; |
280 | hdr->daddr = *daddr; | |
1da177e4 LT |
281 | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
286 | { | |
287 | struct ip6_ra_chain *ra; | |
288 | struct sock *last = NULL; | |
289 | ||
290 | read_lock(&ip6_ra_lock); | |
291 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
292 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
293 | if (sk && ra->sel == sel && |
294 | (!sk->sk_bound_dev_if || | |
295 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
296 | if (last) { |
297 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
298 | if (skb2) | |
299 | rawv6_rcv(last, skb2); | |
300 | } | |
301 | last = sk; | |
302 | } | |
303 | } | |
304 | ||
305 | if (last) { | |
306 | rawv6_rcv(last, skb); | |
307 | read_unlock(&ip6_ra_lock); | |
308 | return 1; | |
309 | } | |
310 | read_unlock(&ip6_ra_lock); | |
311 | return 0; | |
312 | } | |
313 | ||
e21e0b5f VN |
314 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
315 | { | |
0660e03f | 316 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f | 317 | u8 nexthdr = hdr->nexthdr; |
75f2811c | 318 | __be16 frag_off; |
e21e0b5f VN |
319 | int offset; |
320 | ||
321 | if (ipv6_ext_hdr(nexthdr)) { | |
75f2811c | 322 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); |
e21e0b5f VN |
323 | if (offset < 0) |
324 | return 0; | |
325 | } else | |
326 | offset = sizeof(struct ipv6hdr); | |
327 | ||
328 | if (nexthdr == IPPROTO_ICMPV6) { | |
329 | struct icmp6hdr *icmp6; | |
330 | ||
d56f90a7 ACM |
331 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
332 | offset + 1 - skb->data))) | |
e21e0b5f VN |
333 | return 0; |
334 | ||
d56f90a7 | 335 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
336 | |
337 | switch (icmp6->icmp6_type) { | |
338 | case NDISC_ROUTER_SOLICITATION: | |
339 | case NDISC_ROUTER_ADVERTISEMENT: | |
340 | case NDISC_NEIGHBOUR_SOLICITATION: | |
341 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
342 | case NDISC_REDIRECT: | |
343 | /* For reaction involving unicast neighbor discovery | |
344 | * message destined to the proxied address, pass it to | |
345 | * input function. | |
346 | */ | |
347 | return 1; | |
348 | default: | |
349 | break; | |
350 | } | |
351 | } | |
352 | ||
74553b09 VN |
353 | /* |
354 | * The proxying router can't forward traffic sent to a link-local | |
355 | * address, so signal the sender and discard the packet. This | |
356 | * behavior is clarified by the MIPv6 specification. | |
357 | */ | |
358 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
359 | dst_link_failure(skb); | |
360 | return -1; | |
361 | } | |
362 | ||
e21e0b5f VN |
363 | return 0; |
364 | } | |
365 | ||
1da177e4 LT |
366 | static inline int ip6_forward_finish(struct sk_buff *skb) |
367 | { | |
368 | return dst_output(skb); | |
369 | } | |
370 | ||
371 | int ip6_forward(struct sk_buff *skb) | |
372 | { | |
adf30907 | 373 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 374 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 375 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 376 | struct net *net = dev_net(dst->dev); |
14f3ad6f | 377 | u32 mtu; |
1ab1457c | 378 | |
53b7997f | 379 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
380 | goto error; |
381 | ||
4497b076 BH |
382 | if (skb_warn_if_lro(skb)) |
383 | goto drop; | |
384 | ||
1da177e4 | 385 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
3bd653c8 | 386 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
387 | goto drop; |
388 | } | |
389 | ||
72b43d08 AK |
390 | if (skb->pkt_type != PACKET_HOST) |
391 | goto drop; | |
392 | ||
35fc92a9 | 393 | skb_forward_csum(skb); |
1da177e4 LT |
394 | |
395 | /* | |
396 | * We DO NOT make any processing on | |
397 | * RA packets, pushing them to user level AS IS | |
398 | * without ane WARRANTY that application will be able | |
399 | * to interpret them. The reason is that we | |
400 | * cannot make anything clever here. | |
401 | * | |
402 | * We are not end-node, so that if packet contains | |
403 | * AH/ESP, we cannot make anything. | |
404 | * Defragmentation also would be mistake, RA packets | |
405 | * cannot be fragmented, because there is no warranty | |
406 | * that different fragments will go along one path. --ANK | |
407 | */ | |
408 | if (opt->ra) { | |
d56f90a7 | 409 | u8 *ptr = skb_network_header(skb) + opt->ra; |
1da177e4 LT |
410 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
411 | return 0; | |
412 | } | |
413 | ||
414 | /* | |
415 | * check and decrement ttl | |
416 | */ | |
417 | if (hdr->hop_limit <= 1) { | |
418 | /* Force OUTPUT device used as source address */ | |
419 | skb->dev = dst->dev; | |
3ffe533c | 420 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
483a47d2 DL |
421 | IP6_INC_STATS_BH(net, |
422 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
423 | |
424 | kfree_skb(skb); | |
425 | return -ETIMEDOUT; | |
426 | } | |
427 | ||
fbea49e1 | 428 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 429 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 430 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
431 | int proxied = ip6_forward_proxy_check(skb); |
432 | if (proxied > 0) | |
e21e0b5f | 433 | return ip6_input(skb); |
74553b09 | 434 | else if (proxied < 0) { |
3bd653c8 DL |
435 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
436 | IPSTATS_MIB_INDISCARDS); | |
74553b09 VN |
437 | goto drop; |
438 | } | |
e21e0b5f VN |
439 | } |
440 | ||
1da177e4 | 441 | if (!xfrm6_route_forward(skb)) { |
3bd653c8 | 442 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
443 | goto drop; |
444 | } | |
adf30907 | 445 | dst = skb_dst(skb); |
1da177e4 LT |
446 | |
447 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
448 | send redirects to source routed frames. | |
1e5dc146 | 449 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 450 | */ |
c45a3dfb | 451 | if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) { |
1da177e4 | 452 | struct in6_addr *target = NULL; |
fbfe95a4 | 453 | struct inet_peer *peer; |
1da177e4 | 454 | struct rt6_info *rt; |
1da177e4 LT |
455 | |
456 | /* | |
457 | * incoming and outgoing devices are the same | |
458 | * send a redirect. | |
459 | */ | |
460 | ||
461 | rt = (struct rt6_info *) dst; | |
c45a3dfb DM |
462 | if (rt->rt6i_flags & RTF_GATEWAY) |
463 | target = &rt->rt6i_gateway; | |
1da177e4 LT |
464 | else |
465 | target = &hdr->daddr; | |
466 | ||
fbfe95a4 | 467 | peer = rt6_get_peer_create(rt); |
92d86829 | 468 | |
1da177e4 LT |
469 | /* Limit redirects both by destination (here) |
470 | and by source (inside ndisc_send_redirect) | |
471 | */ | |
fbfe95a4 | 472 | if (inet_peer_xrlim_allow(peer, 1*HZ)) |
4991969a | 473 | ndisc_send_redirect(skb, target); |
5bb1ab09 DS |
474 | } else { |
475 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
476 | ||
1da177e4 | 477 | /* This check is security critical. */ |
f81b2e7d YH |
478 | if (addrtype == IPV6_ADDR_ANY || |
479 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
480 | goto error; |
481 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
482 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3ffe533c | 483 | ICMPV6_NOT_NEIGHBOUR, 0); |
5bb1ab09 DS |
484 | goto error; |
485 | } | |
1da177e4 LT |
486 | } |
487 | ||
14f3ad6f UW |
488 | mtu = dst_mtu(dst); |
489 | if (mtu < IPV6_MIN_MTU) | |
490 | mtu = IPV6_MIN_MTU; | |
491 | ||
0aa68271 | 492 | if (skb->len > mtu && !skb_is_gso(skb)) { |
1da177e4 LT |
493 | /* Again, force OUTPUT device used as source address */ |
494 | skb->dev = dst->dev; | |
14f3ad6f | 495 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
483a47d2 DL |
496 | IP6_INC_STATS_BH(net, |
497 | ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); | |
498 | IP6_INC_STATS_BH(net, | |
499 | ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
500 | kfree_skb(skb); |
501 | return -EMSGSIZE; | |
502 | } | |
503 | ||
504 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
3bd653c8 | 505 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
506 | goto drop; |
507 | } | |
508 | ||
0660e03f | 509 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
510 | |
511 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 512 | |
1da177e4 LT |
513 | hdr->hop_limit--; |
514 | ||
483a47d2 | 515 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
2d8dbb04 | 516 | IP6_ADD_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len); |
b2e0b385 | 517 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
6e23ae2a | 518 | ip6_forward_finish); |
1da177e4 LT |
519 | |
520 | error: | |
483a47d2 | 521 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
522 | drop: |
523 | kfree_skb(skb); | |
524 | return -EINVAL; | |
525 | } | |
526 | ||
527 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
528 | { | |
529 | to->pkt_type = from->pkt_type; | |
530 | to->priority = from->priority; | |
531 | to->protocol = from->protocol; | |
adf30907 ED |
532 | skb_dst_drop(to); |
533 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 534 | to->dev = from->dev; |
82e91ffe | 535 | to->mark = from->mark; |
1da177e4 LT |
536 | |
537 | #ifdef CONFIG_NET_SCHED | |
538 | to->tc_index = from->tc_index; | |
539 | #endif | |
e7ac05f3 | 540 | nf_copy(to, from); |
ba9dda3a JK |
541 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
542 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
543 | to->nf_trace = from->nf_trace; | |
544 | #endif | |
984bc16c | 545 | skb_copy_secmark(to, from); |
1da177e4 LT |
546 | } |
547 | ||
548 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
549 | { | |
550 | u16 offset = sizeof(struct ipv6hdr); | |
0660e03f ACM |
551 | struct ipv6_opt_hdr *exthdr = |
552 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
27a884dc | 553 | unsigned int packet_len = skb->tail - skb->network_header; |
1da177e4 | 554 | int found_rhdr = 0; |
0660e03f | 555 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
1da177e4 LT |
556 | |
557 | while (offset + 1 <= packet_len) { | |
558 | ||
559 | switch (**nexthdr) { | |
560 | ||
561 | case NEXTHDR_HOP: | |
27637df9 | 562 | break; |
1da177e4 | 563 | case NEXTHDR_ROUTING: |
27637df9 MN |
564 | found_rhdr = 1; |
565 | break; | |
1da177e4 | 566 | case NEXTHDR_DEST: |
59fbb3a6 | 567 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
568 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
569 | break; | |
570 | #endif | |
571 | if (found_rhdr) | |
572 | return offset; | |
1da177e4 LT |
573 | break; |
574 | default : | |
575 | return offset; | |
576 | } | |
27637df9 MN |
577 | |
578 | offset += ipv6_optlen(exthdr); | |
579 | *nexthdr = &exthdr->nexthdr; | |
d56f90a7 ACM |
580 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
581 | offset); | |
1da177e4 LT |
582 | } |
583 | ||
584 | return offset; | |
585 | } | |
586 | ||
87c48fa3 ED |
587 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) |
588 | { | |
589 | static atomic_t ipv6_fragmentation_id; | |
590 | int old, new; | |
591 | ||
e688a604 | 592 | if (rt && !(rt->dst.flags & DST_NOPEER)) { |
fbfe95a4 | 593 | struct inet_peer *peer = rt6_get_peer_create(rt); |
87c48fa3 | 594 | |
87c48fa3 ED |
595 | if (peer) { |
596 | fhdr->identification = htonl(inet_getid(peer, 0)); | |
597 | return; | |
598 | } | |
599 | } | |
600 | do { | |
601 | old = atomic_read(&ipv6_fragmentation_id); | |
602 | new = old + 1; | |
603 | if (!new) | |
604 | new = 1; | |
605 | } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old); | |
606 | fhdr->identification = htonl(new); | |
607 | } | |
608 | ||
ad0081e4 | 609 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
1da177e4 | 610 | { |
1da177e4 | 611 | struct sk_buff *frag; |
adf30907 | 612 | struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); |
d91675f9 | 613 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
614 | struct ipv6hdr *tmp_hdr; |
615 | struct frag_hdr *fh; | |
616 | unsigned int mtu, hlen, left, len; | |
a7ae1992 | 617 | int hroom, troom; |
ae08e1f0 | 618 | __be32 frag_id = 0; |
1da177e4 LT |
619 | int ptr, offset = 0, err=0; |
620 | u8 *prevhdr, nexthdr = 0; | |
adf30907 | 621 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 622 | |
1da177e4 LT |
623 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
624 | nexthdr = *prevhdr; | |
625 | ||
628a5c56 | 626 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
627 | |
628 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 629 | * or if the skb it not generated by a local socket. |
b881ef76 | 630 | */ |
a34a101e ED |
631 | if (unlikely(!skb->local_df && skb->len > mtu)) { |
632 | if (skb->sk && dst_allfrag(skb_dst(skb))) | |
633 | sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK); | |
634 | ||
adf30907 | 635 | skb->dev = skb_dst(skb)->dev; |
3ffe533c | 636 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
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 | |
21dc3301 | 649 | if (skb_has_frag_list(skb)) { |
1da177e4 | 650 | int first_len = skb_pagelen(skb); |
3d13008e | 651 | struct sk_buff *frag2; |
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) | |
3d13008e | 663 | goto slow_path_clean; |
1da177e4 | 664 | |
1da177e4 LT |
665 | /* Partially cloned skb? */ |
666 | if (skb_shared(frag)) | |
3d13008e | 667 | goto slow_path_clean; |
2fdba6b0 HX |
668 | |
669 | BUG_ON(frag->sk); | |
670 | if (skb->sk) { | |
2fdba6b0 HX |
671 | frag->sk = skb->sk; |
672 | frag->destructor = sock_wfree; | |
2fdba6b0 | 673 | } |
3d13008e | 674 | skb->truesize -= frag->truesize; |
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 | |
87c48fa3 | 697 | ipv6_select_ident(fh, rt); |
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); | |
705 | skb->len = first_len; | |
0660e03f ACM |
706 | ipv6_hdr(skb)->payload_len = htons(first_len - |
707 | sizeof(struct ipv6hdr)); | |
a11d206d | 708 | |
d8d1f30b | 709 | dst_hold(&rt->dst); |
1da177e4 LT |
710 | |
711 | for (;;) { | |
712 | /* Prepare header of the next frame, | |
713 | * before previous one went down. */ | |
714 | if (frag) { | |
715 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 716 | skb_reset_transport_header(frag); |
1da177e4 | 717 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
718 | __skb_push(frag, hlen); |
719 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
720 | memcpy(skb_network_header(frag), tmp_hdr, |
721 | hlen); | |
1da177e4 LT |
722 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
723 | fh->nexthdr = nexthdr; | |
724 | fh->reserved = 0; | |
725 | fh->frag_off = htons(offset); | |
726 | if (frag->next != NULL) | |
727 | fh->frag_off |= htons(IP6_MF); | |
728 | fh->identification = frag_id; | |
0660e03f ACM |
729 | ipv6_hdr(frag)->payload_len = |
730 | htons(frag->len - | |
731 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
732 | ip6_copy_metadata(frag, skb); |
733 | } | |
1ab1457c | 734 | |
1da177e4 | 735 | err = output(skb); |
dafee490 | 736 | if(!err) |
d8d1f30b | 737 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 738 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 739 | |
1da177e4 LT |
740 | if (err || !frag) |
741 | break; | |
742 | ||
743 | skb = frag; | |
744 | frag = skb->next; | |
745 | skb->next = NULL; | |
746 | } | |
747 | ||
a51482bd | 748 | kfree(tmp_hdr); |
1da177e4 LT |
749 | |
750 | if (err == 0) { | |
d8d1f30b | 751 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 752 | IPSTATS_MIB_FRAGOKS); |
d8d1f30b | 753 | dst_release(&rt->dst); |
1da177e4 LT |
754 | return 0; |
755 | } | |
756 | ||
757 | while (frag) { | |
758 | skb = frag->next; | |
759 | kfree_skb(frag); | |
760 | frag = skb; | |
761 | } | |
762 | ||
d8d1f30b | 763 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 764 | IPSTATS_MIB_FRAGFAILS); |
d8d1f30b | 765 | dst_release(&rt->dst); |
1da177e4 | 766 | return err; |
3d13008e ED |
767 | |
768 | slow_path_clean: | |
769 | skb_walk_frags(skb, frag2) { | |
770 | if (frag2 == frag) | |
771 | break; | |
772 | frag2->sk = NULL; | |
773 | frag2->destructor = NULL; | |
774 | skb->truesize += frag2->truesize; | |
775 | } | |
1da177e4 LT |
776 | } |
777 | ||
778 | slow_path: | |
72e843bb ED |
779 | if ((skb->ip_summed == CHECKSUM_PARTIAL) && |
780 | skb_checksum_help(skb)) | |
781 | goto fail; | |
782 | ||
1da177e4 LT |
783 | left = skb->len - hlen; /* Space per frame */ |
784 | ptr = hlen; /* Where to start from */ | |
785 | ||
786 | /* | |
787 | * Fragment the datagram. | |
788 | */ | |
789 | ||
790 | *prevhdr = NEXTHDR_FRAGMENT; | |
a7ae1992 HX |
791 | hroom = LL_RESERVED_SPACE(rt->dst.dev); |
792 | troom = rt->dst.dev->needed_tailroom; | |
1da177e4 LT |
793 | |
794 | /* | |
795 | * Keep copying data until we run out. | |
796 | */ | |
797 | while(left > 0) { | |
798 | len = left; | |
799 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
800 | if (len > mtu) | |
801 | len = mtu; | |
25985edc | 802 | /* IF: we are not sending up to and including the packet end |
1da177e4 LT |
803 | then align the next start on an eight byte boundary */ |
804 | if (len < left) { | |
805 | len &= ~7; | |
806 | } | |
807 | /* | |
808 | * Allocate buffer. | |
809 | */ | |
810 | ||
a7ae1992 HX |
811 | if ((frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) + |
812 | hroom + troom, GFP_ATOMIC)) == NULL) { | |
64ce2073 | 813 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
adf30907 | 814 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 815 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
816 | err = -ENOMEM; |
817 | goto fail; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Set up data on packet | |
822 | */ | |
823 | ||
824 | ip6_copy_metadata(frag, skb); | |
a7ae1992 | 825 | skb_reserve(frag, hroom); |
1da177e4 | 826 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
c1d2bbe1 | 827 | skb_reset_network_header(frag); |
badff6d0 | 828 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
b0e380b1 ACM |
829 | frag->transport_header = (frag->network_header + hlen + |
830 | sizeof(struct frag_hdr)); | |
1da177e4 LT |
831 | |
832 | /* | |
833 | * Charge the memory for the fragment to any owner | |
834 | * it might possess | |
835 | */ | |
836 | if (skb->sk) | |
837 | skb_set_owner_w(frag, skb->sk); | |
838 | ||
839 | /* | |
840 | * Copy the packet header into the new buffer. | |
841 | */ | |
d626f62b | 842 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
1da177e4 LT |
843 | |
844 | /* | |
845 | * Build fragment header. | |
846 | */ | |
847 | fh->nexthdr = nexthdr; | |
848 | fh->reserved = 0; | |
f36d6ab1 | 849 | if (!frag_id) { |
87c48fa3 | 850 | ipv6_select_ident(fh, rt); |
1da177e4 LT |
851 | frag_id = fh->identification; |
852 | } else | |
853 | fh->identification = frag_id; | |
854 | ||
855 | /* | |
856 | * Copy a block of the IP datagram. | |
857 | */ | |
8984e41d | 858 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
1da177e4 LT |
859 | BUG(); |
860 | left -= len; | |
861 | ||
862 | fh->frag_off = htons(offset); | |
863 | if (left > 0) | |
864 | fh->frag_off |= htons(IP6_MF); | |
0660e03f ACM |
865 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
866 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
867 | |
868 | ptr += len; | |
869 | offset += len; | |
870 | ||
871 | /* | |
872 | * Put this fragment into the sending queue. | |
873 | */ | |
1da177e4 LT |
874 | err = output(frag); |
875 | if (err) | |
876 | goto fail; | |
dafee490 | 877 | |
adf30907 | 878 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 879 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 880 | } |
adf30907 | 881 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 882 | IPSTATS_MIB_FRAGOKS); |
808db80a | 883 | consume_skb(skb); |
1da177e4 LT |
884 | return err; |
885 | ||
886 | fail: | |
adf30907 | 887 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 888 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 889 | kfree_skb(skb); |
1da177e4 LT |
890 | return err; |
891 | } | |
892 | ||
b71d1d42 ED |
893 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
894 | const struct in6_addr *fl_addr, | |
895 | const struct in6_addr *addr_cache) | |
cf6b1982 | 896 | { |
a02cec21 ED |
897 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
898 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)); | |
cf6b1982 YH |
899 | } |
900 | ||
497c615a HX |
901 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
902 | struct dst_entry *dst, | |
b71d1d42 | 903 | const struct flowi6 *fl6) |
1da177e4 | 904 | { |
497c615a HX |
905 | struct ipv6_pinfo *np = inet6_sk(sk); |
906 | struct rt6_info *rt = (struct rt6_info *)dst; | |
1da177e4 | 907 | |
497c615a HX |
908 | if (!dst) |
909 | goto out; | |
910 | ||
911 | /* Yes, checking route validity in not connected | |
912 | * case is not very simple. Take into account, | |
913 | * that we do not support routing by source, TOS, | |
914 | * and MSG_DONTROUTE --ANK (980726) | |
915 | * | |
cf6b1982 YH |
916 | * 1. ip6_rt_check(): If route was host route, |
917 | * check that cached destination is current. | |
497c615a HX |
918 | * If it is network route, we still may |
919 | * check its validity using saved pointer | |
920 | * to the last used address: daddr_cache. | |
921 | * We do not want to save whole address now, | |
922 | * (because main consumer of this service | |
923 | * is tcp, which has not this problem), | |
924 | * so that the last trick works only on connected | |
925 | * sockets. | |
926 | * 2. oif also should be the same. | |
927 | */ | |
4c9483b2 | 928 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
8e1ef0a9 | 929 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 930 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
8e1ef0a9 | 931 | #endif |
4c9483b2 | 932 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) { |
497c615a HX |
933 | dst_release(dst); |
934 | dst = NULL; | |
1da177e4 LT |
935 | } |
936 | ||
497c615a HX |
937 | out: |
938 | return dst; | |
939 | } | |
940 | ||
941 | static int ip6_dst_lookup_tail(struct sock *sk, | |
4c9483b2 | 942 | struct dst_entry **dst, struct flowi6 *fl6) |
497c615a | 943 | { |
3b1e0a65 | 944 | struct net *net = sock_net(sk); |
69cce1d1 DM |
945 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
946 | struct neighbour *n; | |
947 | #endif | |
948 | int err; | |
497c615a | 949 | |
1da177e4 | 950 | if (*dst == NULL) |
4c9483b2 | 951 | *dst = ip6_route_output(net, sk, fl6); |
1da177e4 LT |
952 | |
953 | if ((err = (*dst)->error)) | |
954 | goto out_err_release; | |
955 | ||
4c9483b2 | 956 | if (ipv6_addr_any(&fl6->saddr)) { |
c3968a85 DW |
957 | struct rt6_info *rt = (struct rt6_info *) *dst; |
958 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
959 | sk ? inet6_sk(sk)->srcprefs : 0, | |
960 | &fl6->saddr); | |
44456d37 | 961 | if (err) |
1da177e4 | 962 | goto out_err_release; |
1da177e4 LT |
963 | } |
964 | ||
95c385b4 | 965 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
966 | /* |
967 | * Here if the dst entry we've looked up | |
968 | * has a neighbour entry that is in the INCOMPLETE | |
969 | * state and the src address from the flow is | |
970 | * marked as OPTIMISTIC, we release the found | |
971 | * dst entry and replace it instead with the | |
972 | * dst entry of the nexthop router | |
973 | */ | |
f2c31e32 | 974 | rcu_read_lock(); |
27217455 | 975 | n = dst_get_neighbour_noref(*dst); |
69cce1d1 | 976 | if (n && !(n->nud_state & NUD_VALID)) { |
e550dfb0 | 977 | struct inet6_ifaddr *ifp; |
4c9483b2 | 978 | struct flowi6 fl_gw6; |
e550dfb0 NH |
979 | int redirect; |
980 | ||
f2c31e32 | 981 | rcu_read_unlock(); |
4c9483b2 | 982 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
e550dfb0 NH |
983 | (*dst)->dev, 1); |
984 | ||
985 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
986 | if (ifp) | |
987 | in6_ifa_put(ifp); | |
988 | ||
989 | if (redirect) { | |
990 | /* | |
991 | * We need to get the dst entry for the | |
992 | * default router instead | |
993 | */ | |
994 | dst_release(*dst); | |
4c9483b2 DM |
995 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
996 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
997 | *dst = ip6_route_output(net, sk, &fl_gw6); | |
e550dfb0 NH |
998 | if ((err = (*dst)->error)) |
999 | goto out_err_release; | |
95c385b4 | 1000 | } |
f2c31e32 ED |
1001 | } else { |
1002 | rcu_read_unlock(); | |
e550dfb0 | 1003 | } |
95c385b4 NH |
1004 | #endif |
1005 | ||
1da177e4 LT |
1006 | return 0; |
1007 | ||
1008 | out_err_release: | |
ca46f9c8 | 1009 | if (err == -ENETUNREACH) |
483a47d2 | 1010 | IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1011 | dst_release(*dst); |
1012 | *dst = NULL; | |
1013 | return err; | |
1014 | } | |
34a0b3cd | 1015 | |
497c615a HX |
1016 | /** |
1017 | * ip6_dst_lookup - perform route lookup on flow | |
1018 | * @sk: socket which provides route info | |
1019 | * @dst: pointer to dst_entry * for result | |
4c9483b2 | 1020 | * @fl6: flow to lookup |
497c615a HX |
1021 | * |
1022 | * This function performs a route lookup on the given flow. | |
1023 | * | |
1024 | * It returns zero on success, or a standard errno code on error. | |
1025 | */ | |
4c9483b2 | 1026 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6) |
497c615a HX |
1027 | { |
1028 | *dst = NULL; | |
4c9483b2 | 1029 | return ip6_dst_lookup_tail(sk, dst, fl6); |
497c615a | 1030 | } |
3cf3dc6c ACM |
1031 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
1032 | ||
497c615a | 1033 | /** |
68d0c6d3 DM |
1034 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
1035 | * @sk: socket which provides route info | |
4c9483b2 | 1036 | * @fl6: flow to lookup |
68d0c6d3 | 1037 | * @final_dst: final destination address for ipsec lookup |
a1414715 | 1038 | * @can_sleep: we are in a sleepable context |
68d0c6d3 DM |
1039 | * |
1040 | * This function performs a route lookup on the given flow. | |
1041 | * | |
1042 | * It returns a valid dst pointer on success, or a pointer encoded | |
1043 | * error code. | |
1044 | */ | |
4c9483b2 | 1045 | struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
68d0c6d3 | 1046 | const struct in6_addr *final_dst, |
a1414715 | 1047 | bool can_sleep) |
68d0c6d3 DM |
1048 | { |
1049 | struct dst_entry *dst = NULL; | |
1050 | int err; | |
1051 | ||
4c9483b2 | 1052 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1053 | if (err) |
1054 | return ERR_PTR(err); | |
1055 | if (final_dst) | |
4e3fd7a0 | 1056 | fl6->daddr = *final_dst; |
2774c131 | 1057 | if (can_sleep) |
4c9483b2 | 1058 | fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; |
2774c131 | 1059 | |
4c9483b2 | 1060 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
68d0c6d3 DM |
1061 | } |
1062 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
1063 | ||
1064 | /** | |
1065 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
497c615a | 1066 | * @sk: socket which provides the dst cache and route info |
4c9483b2 | 1067 | * @fl6: flow to lookup |
68d0c6d3 | 1068 | * @final_dst: final destination address for ipsec lookup |
a1414715 | 1069 | * @can_sleep: we are in a sleepable context |
497c615a HX |
1070 | * |
1071 | * This function performs a route lookup on the given flow with the | |
1072 | * possibility of using the cached route in the socket if it is valid. | |
1073 | * It will take the socket dst lock when operating on the dst cache. | |
1074 | * As a result, this function can only be used in process context. | |
1075 | * | |
68d0c6d3 DM |
1076 | * It returns a valid dst pointer on success, or a pointer encoded |
1077 | * error code. | |
497c615a | 1078 | */ |
4c9483b2 | 1079 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
68d0c6d3 | 1080 | const struct in6_addr *final_dst, |
a1414715 | 1081 | bool can_sleep) |
497c615a | 1082 | { |
68d0c6d3 DM |
1083 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
1084 | int err; | |
497c615a | 1085 | |
4c9483b2 | 1086 | dst = ip6_sk_dst_check(sk, dst, fl6); |
68d0c6d3 | 1087 | |
4c9483b2 | 1088 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1089 | if (err) |
1090 | return ERR_PTR(err); | |
1091 | if (final_dst) | |
4e3fd7a0 | 1092 | fl6->daddr = *final_dst; |
2774c131 | 1093 | if (can_sleep) |
4c9483b2 | 1094 | fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; |
2774c131 | 1095 | |
4c9483b2 | 1096 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
497c615a | 1097 | } |
68d0c6d3 | 1098 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
497c615a | 1099 | |
34a0b3cd | 1100 | static inline int ip6_ufo_append_data(struct sock *sk, |
e89e9cf5 AR |
1101 | int getfrag(void *from, char *to, int offset, int len, |
1102 | int odd, struct sk_buff *skb), | |
1103 | void *from, int length, int hh_len, int fragheaderlen, | |
87c48fa3 ED |
1104 | int transhdrlen, int mtu,unsigned int flags, |
1105 | struct rt6_info *rt) | |
e89e9cf5 AR |
1106 | |
1107 | { | |
1108 | struct sk_buff *skb; | |
1109 | int err; | |
1110 | ||
1111 | /* There is support for UDP large send offload by network | |
1112 | * device, so create one single skb packet containing complete | |
1113 | * udp datagram | |
1114 | */ | |
1115 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
1116 | skb = sock_alloc_send_skb(sk, | |
1117 | hh_len + fragheaderlen + transhdrlen + 20, | |
1118 | (flags & MSG_DONTWAIT), &err); | |
1119 | if (skb == NULL) | |
504744e4 | 1120 | return err; |
e89e9cf5 AR |
1121 | |
1122 | /* reserve space for Hardware header */ | |
1123 | skb_reserve(skb, hh_len); | |
1124 | ||
1125 | /* create space for UDP/IP header */ | |
1126 | skb_put(skb,fragheaderlen + transhdrlen); | |
1127 | ||
1128 | /* initialize network header pointer */ | |
c1d2bbe1 | 1129 | skb_reset_network_header(skb); |
e89e9cf5 AR |
1130 | |
1131 | /* initialize protocol header pointer */ | |
b0e380b1 | 1132 | skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf5 | 1133 | |
84fa7933 | 1134 | skb->ip_summed = CHECKSUM_PARTIAL; |
e89e9cf5 | 1135 | skb->csum = 0; |
e89e9cf5 AR |
1136 | } |
1137 | ||
1138 | err = skb_append_datato_frags(sk,skb, getfrag, from, | |
1139 | (length - transhdrlen)); | |
1140 | if (!err) { | |
1141 | struct frag_hdr fhdr; | |
1142 | ||
c31d5326 SS |
1143 | /* Specify the length of each IPv6 datagram fragment. |
1144 | * It has to be a multiple of 8. | |
1145 | */ | |
1146 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - | |
1147 | sizeof(struct frag_hdr)) & ~7; | |
f83ef8c0 | 1148 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
87c48fa3 | 1149 | ipv6_select_ident(&fhdr, rt); |
e89e9cf5 AR |
1150 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; |
1151 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | /* There is not enough support do UPD LSO, | |
1156 | * so follow normal path | |
1157 | */ | |
1158 | kfree_skb(skb); | |
1159 | ||
1160 | return err; | |
1161 | } | |
1da177e4 | 1162 | |
0178b695 HX |
1163 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1164 | gfp_t gfp) | |
1165 | { | |
1166 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1167 | } | |
1168 | ||
1169 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1170 | gfp_t gfp) | |
1171 | { | |
1172 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1173 | } | |
1174 | ||
0c183379 G |
1175 | static void ip6_append_data_mtu(int *mtu, |
1176 | int *maxfraglen, | |
1177 | unsigned int fragheaderlen, | |
1178 | struct sk_buff *skb, | |
1179 | struct rt6_info *rt) | |
1180 | { | |
1181 | if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { | |
1182 | if (skb == NULL) { | |
1183 | /* first fragment, reserve header_len */ | |
1184 | *mtu = *mtu - rt->dst.header_len; | |
1185 | ||
1186 | } else { | |
1187 | /* | |
1188 | * this fragment is not first, the headers | |
1189 | * space is regarded as data space. | |
1190 | */ | |
1191 | *mtu = dst_mtu(rt->dst.path); | |
1192 | } | |
1193 | *maxfraglen = ((*mtu - fragheaderlen) & ~7) | |
1194 | + fragheaderlen - sizeof(struct frag_hdr); | |
1195 | } | |
1196 | } | |
1197 | ||
41a1f8ea YH |
1198 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
1199 | int offset, int len, int odd, struct sk_buff *skb), | |
1200 | void *from, int length, int transhdrlen, | |
4c9483b2 | 1201 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, |
13b52cd4 | 1202 | struct rt6_info *rt, unsigned int flags, int dontfrag) |
1da177e4 LT |
1203 | { |
1204 | struct inet_sock *inet = inet_sk(sk); | |
1205 | struct ipv6_pinfo *np = inet6_sk(sk); | |
bdc712b4 | 1206 | struct inet_cork *cork; |
0c183379 | 1207 | struct sk_buff *skb, *skb_prev = NULL; |
1da177e4 LT |
1208 | unsigned int maxfraglen, fragheaderlen; |
1209 | int exthdrlen; | |
299b0767 | 1210 | int dst_exthdrlen; |
1da177e4 LT |
1211 | int hh_len; |
1212 | int mtu; | |
1213 | int copy; | |
1214 | int err; | |
1215 | int offset = 0; | |
a693e698 | 1216 | __u8 tx_flags = 0; |
1da177e4 LT |
1217 | |
1218 | if (flags&MSG_PROBE) | |
1219 | return 0; | |
bdc712b4 | 1220 | cork = &inet->cork.base; |
1da177e4 LT |
1221 | if (skb_queue_empty(&sk->sk_write_queue)) { |
1222 | /* | |
1223 | * setup for corking | |
1224 | */ | |
1225 | if (opt) { | |
0178b695 | 1226 | if (WARN_ON(np->cork.opt)) |
1da177e4 | 1227 | return -EINVAL; |
0178b695 HX |
1228 | |
1229 | np->cork.opt = kmalloc(opt->tot_len, sk->sk_allocation); | |
1230 | if (unlikely(np->cork.opt == NULL)) | |
1231 | return -ENOBUFS; | |
1232 | ||
1233 | np->cork.opt->tot_len = opt->tot_len; | |
1234 | np->cork.opt->opt_flen = opt->opt_flen; | |
1235 | np->cork.opt->opt_nflen = opt->opt_nflen; | |
1236 | ||
1237 | np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
1238 | sk->sk_allocation); | |
1239 | if (opt->dst0opt && !np->cork.opt->dst0opt) | |
1240 | return -ENOBUFS; | |
1241 | ||
1242 | np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
1243 | sk->sk_allocation); | |
1244 | if (opt->dst1opt && !np->cork.opt->dst1opt) | |
1245 | return -ENOBUFS; | |
1246 | ||
1247 | np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt, | |
1248 | sk->sk_allocation); | |
1249 | if (opt->hopopt && !np->cork.opt->hopopt) | |
1250 | return -ENOBUFS; | |
1251 | ||
1252 | np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
1253 | sk->sk_allocation); | |
1254 | if (opt->srcrt && !np->cork.opt->srcrt) | |
1255 | return -ENOBUFS; | |
1256 | ||
1da177e4 LT |
1257 | /* need source address above miyazawa*/ |
1258 | } | |
d8d1f30b | 1259 | dst_hold(&rt->dst); |
bdc712b4 | 1260 | cork->dst = &rt->dst; |
4c9483b2 | 1261 | inet->cork.fl.u.ip6 = *fl6; |
1da177e4 | 1262 | np->cork.hop_limit = hlimit; |
41a1f8ea | 1263 | np->cork.tclass = tclass; |
0c183379 G |
1264 | if (rt->dst.flags & DST_XFRM_TUNNEL) |
1265 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? | |
1266 | rt->dst.dev->mtu : dst_mtu(&rt->dst); | |
1267 | else | |
1268 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? | |
1269 | rt->dst.dev->mtu : dst_mtu(rt->dst.path); | |
c7503609 | 1270 | if (np->frag_size < mtu) { |
d91675f9 YH |
1271 | if (np->frag_size) |
1272 | mtu = np->frag_size; | |
1273 | } | |
bdc712b4 | 1274 | cork->fragsize = mtu; |
d8d1f30b | 1275 | if (dst_allfrag(rt->dst.path)) |
bdc712b4 DM |
1276 | cork->flags |= IPCORK_ALLFRAG; |
1277 | cork->length = 0; | |
1da177e4 LT |
1278 | sk->sk_sndmsg_page = NULL; |
1279 | sk->sk_sndmsg_off = 0; | |
299b0767 | 1280 | exthdrlen = (opt ? opt->opt_flen : 0) - rt->rt6i_nfheader_len; |
1da177e4 LT |
1281 | length += exthdrlen; |
1282 | transhdrlen += exthdrlen; | |
299b0767 | 1283 | dst_exthdrlen = rt->dst.header_len; |
1da177e4 | 1284 | } else { |
bdc712b4 | 1285 | rt = (struct rt6_info *)cork->dst; |
4c9483b2 | 1286 | fl6 = &inet->cork.fl.u.ip6; |
0178b695 | 1287 | opt = np->cork.opt; |
1da177e4 LT |
1288 | transhdrlen = 0; |
1289 | exthdrlen = 0; | |
299b0767 | 1290 | dst_exthdrlen = 0; |
bdc712b4 | 1291 | mtu = cork->fragsize; |
1da177e4 LT |
1292 | } |
1293 | ||
d8d1f30b | 1294 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4 | 1295 | |
a1b05140 | 1296 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1297 | (opt ? opt->opt_nflen : 0); |
1da177e4 LT |
1298 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); |
1299 | ||
1300 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
bdc712b4 | 1301 | if (cork->length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { |
4c9483b2 | 1302 | ipv6_local_error(sk, EMSGSIZE, fl6, mtu-exthdrlen); |
1da177e4 LT |
1303 | return -EMSGSIZE; |
1304 | } | |
1305 | } | |
1306 | ||
a693e698 AB |
1307 | /* For UDP, check if TX timestamp is enabled */ |
1308 | if (sk->sk_type == SOCK_DGRAM) { | |
1309 | err = sock_tx_timestamp(sk, &tx_flags); | |
1310 | if (err) | |
1311 | goto error; | |
1312 | } | |
1313 | ||
1da177e4 LT |
1314 | /* |
1315 | * Let's try using as much space as possible. | |
1316 | * Use MTU if total length of the message fits into the MTU. | |
1317 | * Otherwise, we need to reserve fragment header and | |
1318 | * fragment alignment (= 8-15 octects, in total). | |
1319 | * | |
1320 | * Note that we may need to "move" the data from the tail of | |
1ab1457c | 1321 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1322 | * the message. |
1323 | * | |
1ab1457c | 1324 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1325 | * at once if non-fragmentable extension headers |
1326 | * are too large. | |
1ab1457c | 1327 | * --yoshfuji |
1da177e4 LT |
1328 | */ |
1329 | ||
bdc712b4 | 1330 | cork->length += length; |
4b340ae2 BH |
1331 | if (length > mtu) { |
1332 | int proto = sk->sk_protocol; | |
1333 | if (dontfrag && (proto == IPPROTO_UDP || proto == IPPROTO_RAW)){ | |
4c9483b2 | 1334 | ipv6_local_rxpmtu(sk, fl6, mtu-exthdrlen); |
4b340ae2 BH |
1335 | return -EMSGSIZE; |
1336 | } | |
e89e9cf5 | 1337 | |
4b340ae2 | 1338 | if (proto == IPPROTO_UDP && |
d8d1f30b | 1339 | (rt->dst.dev->features & NETIF_F_UFO)) { |
4b340ae2 BH |
1340 | |
1341 | err = ip6_ufo_append_data(sk, getfrag, from, length, | |
1342 | hh_len, fragheaderlen, | |
87c48fa3 | 1343 | transhdrlen, mtu, flags, rt); |
4b340ae2 BH |
1344 | if (err) |
1345 | goto error; | |
1346 | return 0; | |
1347 | } | |
e89e9cf5 | 1348 | } |
1da177e4 LT |
1349 | |
1350 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) | |
1351 | goto alloc_new_skb; | |
1352 | ||
1353 | while (length > 0) { | |
1354 | /* Check if the remaining data fits into current packet. */ | |
bdc712b4 | 1355 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
1da177e4 LT |
1356 | if (copy < length) |
1357 | copy = maxfraglen - skb->len; | |
1358 | ||
1359 | if (copy <= 0) { | |
1360 | char *data; | |
1361 | unsigned int datalen; | |
1362 | unsigned int fraglen; | |
1363 | unsigned int fraggap; | |
1364 | unsigned int alloclen; | |
1da177e4 | 1365 | alloc_new_skb: |
1da177e4 | 1366 | /* There's no room in the current skb */ |
0c183379 G |
1367 | if (skb) |
1368 | fraggap = skb->len - maxfraglen; | |
1da177e4 LT |
1369 | else |
1370 | fraggap = 0; | |
0c183379 G |
1371 | /* update mtu and maxfraglen if necessary */ |
1372 | if (skb == NULL || skb_prev == NULL) | |
1373 | ip6_append_data_mtu(&mtu, &maxfraglen, | |
1374 | fragheaderlen, skb, rt); | |
1375 | ||
1376 | skb_prev = skb; | |
1da177e4 LT |
1377 | |
1378 | /* | |
1379 | * If remaining data exceeds the mtu, | |
1380 | * we know we need more fragment(s). | |
1381 | */ | |
1382 | datalen = length + fraggap; | |
1da177e4 | 1383 | |
0c183379 G |
1384 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
1385 | datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; | |
1da177e4 | 1386 | if ((flags & MSG_MORE) && |
d8d1f30b | 1387 | !(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4 LT |
1388 | alloclen = mtu; |
1389 | else | |
1390 | alloclen = datalen + fragheaderlen; | |
1391 | ||
299b0767 SK |
1392 | alloclen += dst_exthdrlen; |
1393 | ||
0c183379 G |
1394 | if (datalen != length + fraggap) { |
1395 | /* | |
1396 | * this is not the last fragment, the trailer | |
1397 | * space is regarded as data space. | |
1398 | */ | |
1399 | datalen += rt->dst.trailer_len; | |
1400 | } | |
1401 | ||
1402 | alloclen += rt->dst.trailer_len; | |
1403 | fraglen = datalen + fragheaderlen; | |
1da177e4 LT |
1404 | |
1405 | /* | |
1406 | * We just reserve space for fragment header. | |
1ab1457c | 1407 | * Note: this may be overallocation if the message |
1da177e4 LT |
1408 | * (without MSG_MORE) fits into the MTU. |
1409 | */ | |
1410 | alloclen += sizeof(struct frag_hdr); | |
1411 | ||
1412 | if (transhdrlen) { | |
1413 | skb = sock_alloc_send_skb(sk, | |
1414 | alloclen + hh_len, | |
1415 | (flags & MSG_DONTWAIT), &err); | |
1416 | } else { | |
1417 | skb = NULL; | |
1418 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1419 | 2 * sk->sk_sndbuf) | |
1420 | skb = sock_wmalloc(sk, | |
1421 | alloclen + hh_len, 1, | |
1422 | sk->sk_allocation); | |
1423 | if (unlikely(skb == NULL)) | |
1424 | err = -ENOBUFS; | |
a693e698 AB |
1425 | else { |
1426 | /* Only the initial fragment | |
1427 | * is time stamped. | |
1428 | */ | |
1429 | tx_flags = 0; | |
1430 | } | |
1da177e4 LT |
1431 | } |
1432 | if (skb == NULL) | |
1433 | goto error; | |
1434 | /* | |
1435 | * Fill in the control structures | |
1436 | */ | |
d7f7c0ac | 1437 | skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 1438 | skb->csum = 0; |
1f85851e G |
1439 | /* reserve for fragmentation and ipsec header */ |
1440 | skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + | |
1441 | dst_exthdrlen); | |
1da177e4 | 1442 | |
a693e698 AB |
1443 | if (sk->sk_type == SOCK_DGRAM) |
1444 | skb_shinfo(skb)->tx_flags = tx_flags; | |
1445 | ||
1da177e4 LT |
1446 | /* |
1447 | * Find where to start putting bytes | |
1448 | */ | |
1f85851e G |
1449 | data = skb_put(skb, fraglen); |
1450 | skb_set_network_header(skb, exthdrlen); | |
1451 | data += fragheaderlen; | |
b0e380b1 ACM |
1452 | skb->transport_header = (skb->network_header + |
1453 | fragheaderlen); | |
1da177e4 LT |
1454 | if (fraggap) { |
1455 | skb->csum = skb_copy_and_csum_bits( | |
1456 | skb_prev, maxfraglen, | |
1457 | data + transhdrlen, fraggap, 0); | |
1458 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1459 | skb->csum); | |
1460 | data += fraggap; | |
e9fa4f7b | 1461 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1462 | } |
1463 | copy = datalen - transhdrlen - fraggap; | |
299b0767 | 1464 | |
1da177e4 LT |
1465 | if (copy < 0) { |
1466 | err = -EINVAL; | |
1467 | kfree_skb(skb); | |
1468 | goto error; | |
1469 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1470 | err = -EFAULT; | |
1471 | kfree_skb(skb); | |
1472 | goto error; | |
1473 | } | |
1474 | ||
1475 | offset += copy; | |
1476 | length -= datalen - fraggap; | |
1477 | transhdrlen = 0; | |
1478 | exthdrlen = 0; | |
299b0767 | 1479 | dst_exthdrlen = 0; |
1da177e4 LT |
1480 | |
1481 | /* | |
1482 | * Put the packet on the pending queue | |
1483 | */ | |
1484 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1485 | continue; | |
1486 | } | |
1487 | ||
1488 | if (copy > length) | |
1489 | copy = length; | |
1490 | ||
d8d1f30b | 1491 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
1da177e4 LT |
1492 | unsigned int off; |
1493 | ||
1494 | off = skb->len; | |
1495 | if (getfrag(from, skb_put(skb, copy), | |
1496 | offset, copy, off, skb) < 0) { | |
1497 | __skb_trim(skb, off); | |
1498 | err = -EFAULT; | |
1499 | goto error; | |
1500 | } | |
1501 | } else { | |
1502 | int i = skb_shinfo(skb)->nr_frags; | |
1503 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | |
1504 | struct page *page = sk->sk_sndmsg_page; | |
1505 | int off = sk->sk_sndmsg_off; | |
1506 | unsigned int left; | |
1507 | ||
1508 | if (page && (left = PAGE_SIZE - off) > 0) { | |
1509 | if (copy >= left) | |
1510 | copy = left; | |
408dadf0 | 1511 | if (page != skb_frag_page(frag)) { |
1da177e4 LT |
1512 | if (i == MAX_SKB_FRAGS) { |
1513 | err = -EMSGSIZE; | |
1514 | goto error; | |
1515 | } | |
1da177e4 | 1516 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); |
408dadf0 | 1517 | skb_frag_ref(skb, i); |
1da177e4 LT |
1518 | frag = &skb_shinfo(skb)->frags[i]; |
1519 | } | |
1520 | } else if(i < MAX_SKB_FRAGS) { | |
1521 | if (copy > PAGE_SIZE) | |
1522 | copy = PAGE_SIZE; | |
1523 | page = alloc_pages(sk->sk_allocation, 0); | |
1524 | if (page == NULL) { | |
1525 | err = -ENOMEM; | |
1526 | goto error; | |
1527 | } | |
1528 | sk->sk_sndmsg_page = page; | |
1529 | sk->sk_sndmsg_off = 0; | |
1530 | ||
1531 | skb_fill_page_desc(skb, i, page, 0, 0); | |
1532 | frag = &skb_shinfo(skb)->frags[i]; | |
1da177e4 LT |
1533 | } else { |
1534 | err = -EMSGSIZE; | |
1535 | goto error; | |
1536 | } | |
9e903e08 ED |
1537 | if (getfrag(from, |
1538 | skb_frag_address(frag) + skb_frag_size(frag), | |
408dadf0 | 1539 | offset, copy, skb->len, skb) < 0) { |
1da177e4 LT |
1540 | err = -EFAULT; |
1541 | goto error; | |
1542 | } | |
1543 | sk->sk_sndmsg_off += copy; | |
9e903e08 | 1544 | skb_frag_size_add(frag, copy); |
1da177e4 LT |
1545 | skb->len += copy; |
1546 | skb->data_len += copy; | |
f945fa7a HX |
1547 | skb->truesize += copy; |
1548 | atomic_add(copy, &sk->sk_wmem_alloc); | |
1da177e4 LT |
1549 | } |
1550 | offset += copy; | |
1551 | length -= copy; | |
1552 | } | |
1553 | return 0; | |
1554 | error: | |
bdc712b4 | 1555 | cork->length -= length; |
3bd653c8 | 1556 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1557 | return err; |
1558 | } | |
a495f836 | 1559 | EXPORT_SYMBOL_GPL(ip6_append_data); |
1da177e4 | 1560 | |
bf138862 PE |
1561 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
1562 | { | |
0178b695 HX |
1563 | if (np->cork.opt) { |
1564 | kfree(np->cork.opt->dst0opt); | |
1565 | kfree(np->cork.opt->dst1opt); | |
1566 | kfree(np->cork.opt->hopopt); | |
1567 | kfree(np->cork.opt->srcrt); | |
1568 | kfree(np->cork.opt); | |
1569 | np->cork.opt = NULL; | |
1570 | } | |
1571 | ||
bdc712b4 DM |
1572 | if (inet->cork.base.dst) { |
1573 | dst_release(inet->cork.base.dst); | |
1574 | inet->cork.base.dst = NULL; | |
1575 | inet->cork.base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 PE |
1576 | } |
1577 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1578 | } | |
1579 | ||
1da177e4 LT |
1580 | int ip6_push_pending_frames(struct sock *sk) |
1581 | { | |
1582 | struct sk_buff *skb, *tmp_skb; | |
1583 | struct sk_buff **tail_skb; | |
1584 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1585 | struct inet_sock *inet = inet_sk(sk); | |
1586 | struct ipv6_pinfo *np = inet6_sk(sk); | |
3bd653c8 | 1587 | struct net *net = sock_net(sk); |
1da177e4 LT |
1588 | struct ipv6hdr *hdr; |
1589 | struct ipv6_txoptions *opt = np->cork.opt; | |
bdc712b4 | 1590 | struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst; |
4c9483b2 DM |
1591 | struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
1592 | unsigned char proto = fl6->flowi6_proto; | |
1da177e4 LT |
1593 | int err = 0; |
1594 | ||
1595 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1596 | goto out; | |
1597 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1598 | ||
1599 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1600 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1601 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1602 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
cfe1fc77 | 1603 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1604 | *tail_skb = tmp_skb; |
1605 | tail_skb = &(tmp_skb->next); | |
1606 | skb->len += tmp_skb->len; | |
1607 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1608 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1609 | tmp_skb->destructor = NULL; |
1610 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1611 | } |
1612 | ||
28a89453 | 1613 | /* Allow local fragmentation. */ |
b5c15fc0 | 1614 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
28a89453 HX |
1615 | skb->local_df = 1; |
1616 | ||
4e3fd7a0 | 1617 | *final_dst = fl6->daddr; |
cfe1fc77 | 1618 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1619 | if (opt && opt->opt_flen) |
1620 | ipv6_push_frag_opts(skb, opt, &proto); | |
1621 | if (opt && opt->opt_nflen) | |
1622 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1623 | ||
e2d1bca7 ACM |
1624 | skb_push(skb, sizeof(struct ipv6hdr)); |
1625 | skb_reset_network_header(skb); | |
0660e03f | 1626 | hdr = ipv6_hdr(skb); |
1ab1457c | 1627 | |
4c9483b2 | 1628 | *(__be32*)hdr = fl6->flowlabel | |
41a1f8ea | 1629 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
1da177e4 | 1630 | |
1da177e4 LT |
1631 | hdr->hop_limit = np->cork.hop_limit; |
1632 | hdr->nexthdr = proto; | |
4e3fd7a0 AD |
1633 | hdr->saddr = fl6->saddr; |
1634 | hdr->daddr = *final_dst; | |
1da177e4 | 1635 | |
a2c2064f | 1636 | skb->priority = sk->sk_priority; |
4a19ec58 | 1637 | skb->mark = sk->sk_mark; |
a2c2064f | 1638 | |
d8d1f30b | 1639 | skb_dst_set(skb, dst_clone(&rt->dst)); |
edf391ff | 1640 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1641 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1642 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1643 | |
5a57d4c7 | 1644 | ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); |
e41b5368 | 1645 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); |
14878f75 DS |
1646 | } |
1647 | ||
ef76bc23 | 1648 | err = ip6_local_out(skb); |
1da177e4 LT |
1649 | if (err) { |
1650 | if (err > 0) | |
6ce9e7b5 | 1651 | err = net_xmit_errno(err); |
1da177e4 LT |
1652 | if (err) |
1653 | goto error; | |
1654 | } | |
1655 | ||
1656 | out: | |
bf138862 | 1657 | ip6_cork_release(inet, np); |
1da177e4 LT |
1658 | return err; |
1659 | error: | |
06254914 | 1660 | IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1661 | goto out; |
1662 | } | |
a495f836 | 1663 | EXPORT_SYMBOL_GPL(ip6_push_pending_frames); |
1da177e4 LT |
1664 | |
1665 | void ip6_flush_pending_frames(struct sock *sk) | |
1666 | { | |
1da177e4 LT |
1667 | struct sk_buff *skb; |
1668 | ||
1669 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
adf30907 ED |
1670 | if (skb_dst(skb)) |
1671 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1672 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1673 | kfree_skb(skb); |
1674 | } | |
1675 | ||
bf138862 | 1676 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
1da177e4 | 1677 | } |
a495f836 | 1678 | EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); |