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> | |
67ba4152 | 23 | * Imran Patel : frag id should be in NBO |
1da177e4 LT |
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> |
ca254490 | 58 | #include <net/l3mdev.h> |
14972cbd | 59 | #include <net/lwtunnel.h> |
1da177e4 | 60 | |
7d8c6e39 | 61 | static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 62 | { |
adf30907 | 63 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 64 | struct net_device *dev = dst->dev; |
f6b72b62 | 65 | struct neighbour *neigh; |
6fd6ce20 YH |
66 | struct in6_addr *nexthop; |
67 | int ret; | |
1da177e4 LT |
68 | |
69 | skb->protocol = htons(ETH_P_IPV6); | |
70 | skb->dev = dev; | |
71 | ||
0660e03f | 72 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
adf30907 | 73 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
1da177e4 | 74 | |
7026b1dd | 75 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) && |
78126c41 | 76 | ((mroute6_socket(net, skb) && |
bd91b8bf | 77 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
7bc570c8 YH |
78 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
79 | &ipv6_hdr(skb)->saddr))) { | |
1da177e4 LT |
80 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
81 | ||
82 | /* Do not check for IFF_ALLMULTI; multicast routing | |
83 | is not supported in any case. | |
84 | */ | |
85 | if (newskb) | |
b2e0b385 | 86 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
29a26a56 | 87 | net, sk, newskb, NULL, newskb->dev, |
95603e22 | 88 | dev_loopback_xmit); |
1da177e4 | 89 | |
0660e03f | 90 | if (ipv6_hdr(skb)->hop_limit == 0) { |
78126c41 | 91 | IP6_INC_STATS(net, idev, |
3bd653c8 | 92 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
93 | kfree_skb(skb); |
94 | return 0; | |
95 | } | |
96 | } | |
97 | ||
78126c41 | 98 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len); |
dd408515 HFS |
99 | |
100 | if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <= | |
101 | IPV6_ADDR_SCOPE_NODELOCAL && | |
102 | !(dev->flags & IFF_LOOPBACK)) { | |
103 | kfree_skb(skb); | |
104 | return 0; | |
105 | } | |
1da177e4 LT |
106 | } |
107 | ||
14972cbd RP |
108 | if (lwtunnel_xmit_redirect(dst->lwtstate)) { |
109 | int res = lwtunnel_xmit(skb); | |
110 | ||
111 | if (res < 0 || res == LWTUNNEL_XMIT_DONE) | |
112 | return res; | |
113 | } | |
114 | ||
6fd6ce20 | 115 | rcu_read_lock_bh(); |
2647a9b0 | 116 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); |
6fd6ce20 YH |
117 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); |
118 | if (unlikely(!neigh)) | |
119 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
120 | if (!IS_ERR(neigh)) { | |
121 | ret = dst_neigh_output(dst, neigh, skb); | |
122 | rcu_read_unlock_bh(); | |
123 | return ret; | |
124 | } | |
125 | rcu_read_unlock_bh(); | |
05e3aa09 | 126 | |
78126c41 | 127 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
9e508490 JE |
128 | kfree_skb(skb); |
129 | return -EINVAL; | |
1da177e4 LT |
130 | } |
131 | ||
0c4b51f0 | 132 | static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
9e508490 JE |
133 | { |
134 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || | |
9037c357 JP |
135 | dst_allfrag(skb_dst(skb)) || |
136 | (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size)) | |
7d8c6e39 | 137 | return ip6_fragment(net, sk, skb, ip6_finish_output2); |
9e508490 | 138 | else |
7d8c6e39 | 139 | return ip6_finish_output2(net, sk, skb); |
9e508490 JE |
140 | } |
141 | ||
ede2059d | 142 | int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 143 | { |
9e508490 | 144 | struct net_device *dev = skb_dst(skb)->dev; |
adf30907 | 145 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
be10de0a | 146 | |
778d80be | 147 | if (unlikely(idev->cnf.disable_ipv6)) { |
19a0644c | 148 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
778d80be YH |
149 | kfree_skb(skb); |
150 | return 0; | |
151 | } | |
152 | ||
29a26a56 EB |
153 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
154 | net, sk, skb, NULL, dev, | |
9c6eb28a JE |
155 | ip6_finish_output, |
156 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1da177e4 LT |
157 | } |
158 | ||
1da177e4 | 159 | /* |
1c1e9d2b ED |
160 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
161 | * Note : socket lock is not held for SYNACK packets, but might be modified | |
162 | * by calls to skb_set_owner_w() and ipv6_local_error(), | |
163 | * which are using proper atomic operations or spinlocks. | |
1da177e4 | 164 | */ |
1c1e9d2b | 165 | int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
b903d324 | 166 | struct ipv6_txoptions *opt, int tclass) |
1da177e4 | 167 | { |
3bd653c8 | 168 | struct net *net = sock_net(sk); |
1c1e9d2b | 169 | const struct ipv6_pinfo *np = inet6_sk(sk); |
4c9483b2 | 170 | struct in6_addr *first_hop = &fl6->daddr; |
adf30907 | 171 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 172 | struct ipv6hdr *hdr; |
4c9483b2 | 173 | u8 proto = fl6->flowi6_proto; |
1da177e4 | 174 | int seg_len = skb->len; |
e651f03a | 175 | int hlimit = -1; |
1da177e4 LT |
176 | u32 mtu; |
177 | ||
178 | if (opt) { | |
c2636b4d | 179 | unsigned int head_room; |
1da177e4 LT |
180 | |
181 | /* First: exthdrs may take lots of space (~8K for now) | |
182 | MAX_HEADER is not enough. | |
183 | */ | |
184 | head_room = opt->opt_nflen + opt->opt_flen; | |
185 | seg_len += head_room; | |
186 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
187 | ||
188 | if (skb_headroom(skb) < head_room) { | |
189 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
63159f29 | 190 | if (!skb2) { |
adf30907 | 191 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
192 | IPSTATS_MIB_OUTDISCARDS); |
193 | kfree_skb(skb); | |
1da177e4 LT |
194 | return -ENOBUFS; |
195 | } | |
808db80a | 196 | consume_skb(skb); |
a11d206d | 197 | skb = skb2; |
1c1e9d2b ED |
198 | /* skb_set_owner_w() changes sk->sk_wmem_alloc atomically, |
199 | * it is safe to call in our context (socket lock not held) | |
200 | */ | |
201 | skb_set_owner_w(skb, (struct sock *)sk); | |
1da177e4 LT |
202 | } |
203 | if (opt->opt_flen) | |
204 | ipv6_push_frag_opts(skb, opt, &proto); | |
205 | if (opt->opt_nflen) | |
206 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
207 | } | |
208 | ||
e2d1bca7 ACM |
209 | skb_push(skb, sizeof(struct ipv6hdr)); |
210 | skb_reset_network_header(skb); | |
0660e03f | 211 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
212 | |
213 | /* | |
214 | * Fill in the IPv6 header | |
215 | */ | |
b903d324 | 216 | if (np) |
1da177e4 LT |
217 | hlimit = np->hop_limit; |
218 | if (hlimit < 0) | |
6b75d090 | 219 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 220 | |
cb1ce2ef | 221 | ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel, |
67800f9b | 222 | np->autoflowlabel, fl6)); |
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 | |
9c9c9ad5 | 231 | skb->protocol = htons(ETH_P_IPV6); |
a2c2064f | 232 | skb->priority = sk->sk_priority; |
4a19ec58 | 233 | skb->mark = sk->sk_mark; |
a2c2064f | 234 | |
1da177e4 | 235 | mtu = dst_mtu(dst); |
60ff7467 | 236 | if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) { |
adf30907 | 237 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 238 | IPSTATS_MIB_OUT, skb->len); |
1c1e9d2b ED |
239 | /* hooks should never assume socket lock is held. |
240 | * we promote our socket to non const | |
241 | */ | |
29a26a56 | 242 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
1c1e9d2b | 243 | net, (struct sock *)sk, skb, NULL, dst->dev, |
13206b6b | 244 | dst_output); |
1da177e4 LT |
245 | } |
246 | ||
1da177e4 | 247 | skb->dev = dst->dev; |
1c1e9d2b ED |
248 | /* ipv6_local_error() does not require socket lock, |
249 | * we promote our socket to non const | |
250 | */ | |
251 | ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu); | |
252 | ||
adf30907 | 253 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
254 | kfree_skb(skb); |
255 | return -EMSGSIZE; | |
256 | } | |
7159039a YH |
257 | EXPORT_SYMBOL(ip6_xmit); |
258 | ||
1da177e4 LT |
259 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
260 | { | |
261 | struct ip6_ra_chain *ra; | |
262 | struct sock *last = NULL; | |
263 | ||
264 | read_lock(&ip6_ra_lock); | |
265 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
266 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
267 | if (sk && ra->sel == sel && |
268 | (!sk->sk_bound_dev_if || | |
269 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
270 | if (last) { |
271 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
272 | if (skb2) | |
273 | rawv6_rcv(last, skb2); | |
274 | } | |
275 | last = sk; | |
276 | } | |
277 | } | |
278 | ||
279 | if (last) { | |
280 | rawv6_rcv(last, skb); | |
281 | read_unlock(&ip6_ra_lock); | |
282 | return 1; | |
283 | } | |
284 | read_unlock(&ip6_ra_lock); | |
285 | return 0; | |
286 | } | |
287 | ||
e21e0b5f VN |
288 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
289 | { | |
0660e03f | 290 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f | 291 | u8 nexthdr = hdr->nexthdr; |
75f2811c | 292 | __be16 frag_off; |
e21e0b5f VN |
293 | int offset; |
294 | ||
295 | if (ipv6_ext_hdr(nexthdr)) { | |
75f2811c | 296 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); |
e21e0b5f VN |
297 | if (offset < 0) |
298 | return 0; | |
299 | } else | |
300 | offset = sizeof(struct ipv6hdr); | |
301 | ||
302 | if (nexthdr == IPPROTO_ICMPV6) { | |
303 | struct icmp6hdr *icmp6; | |
304 | ||
d56f90a7 ACM |
305 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
306 | offset + 1 - skb->data))) | |
e21e0b5f VN |
307 | return 0; |
308 | ||
d56f90a7 | 309 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
310 | |
311 | switch (icmp6->icmp6_type) { | |
312 | case NDISC_ROUTER_SOLICITATION: | |
313 | case NDISC_ROUTER_ADVERTISEMENT: | |
314 | case NDISC_NEIGHBOUR_SOLICITATION: | |
315 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
316 | case NDISC_REDIRECT: | |
317 | /* For reaction involving unicast neighbor discovery | |
318 | * message destined to the proxied address, pass it to | |
319 | * input function. | |
320 | */ | |
321 | return 1; | |
322 | default: | |
323 | break; | |
324 | } | |
325 | } | |
326 | ||
74553b09 VN |
327 | /* |
328 | * The proxying router can't forward traffic sent to a link-local | |
329 | * address, so signal the sender and discard the packet. This | |
330 | * behavior is clarified by the MIPv6 specification. | |
331 | */ | |
332 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
333 | dst_link_failure(skb); | |
334 | return -1; | |
335 | } | |
336 | ||
e21e0b5f VN |
337 | return 0; |
338 | } | |
339 | ||
0c4b51f0 EB |
340 | static inline int ip6_forward_finish(struct net *net, struct sock *sk, |
341 | struct sk_buff *skb) | |
1da177e4 | 342 | { |
13206b6b | 343 | return dst_output(net, sk, skb); |
1da177e4 LT |
344 | } |
345 | ||
0954cf9c HFS |
346 | static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst) |
347 | { | |
348 | unsigned int mtu; | |
349 | struct inet6_dev *idev; | |
350 | ||
351 | if (dst_metric_locked(dst, RTAX_MTU)) { | |
352 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
353 | if (mtu) | |
354 | return mtu; | |
355 | } | |
356 | ||
357 | mtu = IPV6_MIN_MTU; | |
358 | rcu_read_lock(); | |
359 | idev = __in6_dev_get(dst->dev); | |
360 | if (idev) | |
361 | mtu = idev->cnf.mtu6; | |
362 | rcu_read_unlock(); | |
363 | ||
364 | return mtu; | |
365 | } | |
366 | ||
fe6cc55f FW |
367 | static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
368 | { | |
418a3156 | 369 | if (skb->len <= mtu) |
fe6cc55f FW |
370 | return false; |
371 | ||
60ff7467 | 372 | /* ipv6 conntrack defrag sets max_frag_size + ignore_df */ |
fe6cc55f FW |
373 | if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu) |
374 | return true; | |
375 | ||
60ff7467 | 376 | if (skb->ignore_df) |
418a3156 FW |
377 | return false; |
378 | ||
ae7ef81e | 379 | if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu)) |
fe6cc55f FW |
380 | return false; |
381 | ||
382 | return true; | |
383 | } | |
384 | ||
1da177e4 LT |
385 | int ip6_forward(struct sk_buff *skb) |
386 | { | |
adf30907 | 387 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 388 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 389 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 390 | struct net *net = dev_net(dst->dev); |
14f3ad6f | 391 | u32 mtu; |
1ab1457c | 392 | |
53b7997f | 393 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
394 | goto error; |
395 | ||
090f1166 LR |
396 | if (skb->pkt_type != PACKET_HOST) |
397 | goto drop; | |
398 | ||
9ef2e965 HFS |
399 | if (unlikely(skb->sk)) |
400 | goto drop; | |
401 | ||
4497b076 BH |
402 | if (skb_warn_if_lro(skb)) |
403 | goto drop; | |
404 | ||
1da177e4 | 405 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
1d015503 ED |
406 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
407 | IPSTATS_MIB_INDISCARDS); | |
1da177e4 LT |
408 | goto drop; |
409 | } | |
410 | ||
35fc92a9 | 411 | skb_forward_csum(skb); |
1da177e4 LT |
412 | |
413 | /* | |
414 | * We DO NOT make any processing on | |
415 | * RA packets, pushing them to user level AS IS | |
416 | * without ane WARRANTY that application will be able | |
417 | * to interpret them. The reason is that we | |
418 | * cannot make anything clever here. | |
419 | * | |
420 | * We are not end-node, so that if packet contains | |
421 | * AH/ESP, we cannot make anything. | |
422 | * Defragmentation also would be mistake, RA packets | |
423 | * cannot be fragmented, because there is no warranty | |
424 | * that different fragments will go along one path. --ANK | |
425 | */ | |
ab4eb353 YH |
426 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
427 | if (ip6_call_ra_chain(skb, ntohs(opt->ra))) | |
1da177e4 LT |
428 | return 0; |
429 | } | |
430 | ||
431 | /* | |
432 | * check and decrement ttl | |
433 | */ | |
434 | if (hdr->hop_limit <= 1) { | |
435 | /* Force OUTPUT device used as source address */ | |
436 | skb->dev = dst->dev; | |
3ffe533c | 437 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
1d015503 ED |
438 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
439 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
440 | |
441 | kfree_skb(skb); | |
442 | return -ETIMEDOUT; | |
443 | } | |
444 | ||
fbea49e1 | 445 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 446 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 447 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
448 | int proxied = ip6_forward_proxy_check(skb); |
449 | if (proxied > 0) | |
e21e0b5f | 450 | return ip6_input(skb); |
74553b09 | 451 | else if (proxied < 0) { |
1d015503 ED |
452 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
453 | IPSTATS_MIB_INDISCARDS); | |
74553b09 VN |
454 | goto drop; |
455 | } | |
e21e0b5f VN |
456 | } |
457 | ||
1da177e4 | 458 | if (!xfrm6_route_forward(skb)) { |
1d015503 ED |
459 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
460 | IPSTATS_MIB_INDISCARDS); | |
1da177e4 LT |
461 | goto drop; |
462 | } | |
adf30907 | 463 | dst = skb_dst(skb); |
1da177e4 LT |
464 | |
465 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
466 | send redirects to source routed frames. | |
1e5dc146 | 467 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 468 | */ |
c45a3dfb | 469 | if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) { |
1da177e4 | 470 | struct in6_addr *target = NULL; |
fbfe95a4 | 471 | struct inet_peer *peer; |
1da177e4 | 472 | struct rt6_info *rt; |
1da177e4 LT |
473 | |
474 | /* | |
475 | * incoming and outgoing devices are the same | |
476 | * send a redirect. | |
477 | */ | |
478 | ||
479 | rt = (struct rt6_info *) dst; | |
c45a3dfb DM |
480 | if (rt->rt6i_flags & RTF_GATEWAY) |
481 | target = &rt->rt6i_gateway; | |
1da177e4 LT |
482 | else |
483 | target = &hdr->daddr; | |
484 | ||
fd0273d7 | 485 | peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1); |
92d86829 | 486 | |
1da177e4 LT |
487 | /* Limit redirects both by destination (here) |
488 | and by source (inside ndisc_send_redirect) | |
489 | */ | |
fbfe95a4 | 490 | if (inet_peer_xrlim_allow(peer, 1*HZ)) |
4991969a | 491 | ndisc_send_redirect(skb, target); |
1d861aa4 DM |
492 | if (peer) |
493 | inet_putpeer(peer); | |
5bb1ab09 DS |
494 | } else { |
495 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
496 | ||
1da177e4 | 497 | /* This check is security critical. */ |
f81b2e7d YH |
498 | if (addrtype == IPV6_ADDR_ANY || |
499 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
500 | goto error; |
501 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
502 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3ffe533c | 503 | ICMPV6_NOT_NEIGHBOUR, 0); |
5bb1ab09 DS |
504 | goto error; |
505 | } | |
1da177e4 LT |
506 | } |
507 | ||
0954cf9c | 508 | mtu = ip6_dst_mtu_forward(dst); |
14f3ad6f UW |
509 | if (mtu < IPV6_MIN_MTU) |
510 | mtu = IPV6_MIN_MTU; | |
511 | ||
fe6cc55f | 512 | if (ip6_pkt_too_big(skb, mtu)) { |
1da177e4 LT |
513 | /* Again, force OUTPUT device used as source address */ |
514 | skb->dev = dst->dev; | |
14f3ad6f | 515 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1d015503 ED |
516 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
517 | IPSTATS_MIB_INTOOBIGERRORS); | |
518 | __IP6_INC_STATS(net, ip6_dst_idev(dst), | |
519 | IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
520 | kfree_skb(skb); |
521 | return -EMSGSIZE; | |
522 | } | |
523 | ||
524 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
1d015503 ED |
525 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
526 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
527 | goto drop; |
528 | } | |
529 | ||
0660e03f | 530 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
531 | |
532 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 533 | |
1da177e4 LT |
534 | hdr->hop_limit--; |
535 | ||
1d015503 ED |
536 | __IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
537 | __IP6_ADD_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len); | |
29a26a56 EB |
538 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, |
539 | net, NULL, skb, skb->dev, dst->dev, | |
6e23ae2a | 540 | ip6_forward_finish); |
1da177e4 LT |
541 | |
542 | error: | |
1d015503 | 543 | __IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
544 | drop: |
545 | kfree_skb(skb); | |
546 | return -EINVAL; | |
547 | } | |
548 | ||
549 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
550 | { | |
551 | to->pkt_type = from->pkt_type; | |
552 | to->priority = from->priority; | |
553 | to->protocol = from->protocol; | |
adf30907 ED |
554 | skb_dst_drop(to); |
555 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 556 | to->dev = from->dev; |
82e91ffe | 557 | to->mark = from->mark; |
1da177e4 LT |
558 | |
559 | #ifdef CONFIG_NET_SCHED | |
560 | to->tc_index = from->tc_index; | |
561 | #endif | |
e7ac05f3 | 562 | nf_copy(to, from); |
984bc16c | 563 | skb_copy_secmark(to, from); |
1da177e4 LT |
564 | } |
565 | ||
7d8c6e39 EB |
566 | int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
567 | int (*output)(struct net *, struct sock *, struct sk_buff *)) | |
1da177e4 | 568 | { |
1da177e4 | 569 | struct sk_buff *frag; |
67ba4152 | 570 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
f60e5990 | 571 | struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
572 | inet6_sk(skb->sk) : NULL; | |
1da177e4 LT |
573 | struct ipv6hdr *tmp_hdr; |
574 | struct frag_hdr *fh; | |
575 | unsigned int mtu, hlen, left, len; | |
a7ae1992 | 576 | int hroom, troom; |
286c2349 | 577 | __be32 frag_id; |
67ba4152 | 578 | int ptr, offset = 0, err = 0; |
1da177e4 LT |
579 | u8 *prevhdr, nexthdr = 0; |
580 | ||
1da177e4 LT |
581 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
582 | nexthdr = *prevhdr; | |
583 | ||
628a5c56 | 584 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
585 | |
586 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 587 | * or if the skb it not generated by a local socket. |
b881ef76 | 588 | */ |
485fca66 FW |
589 | if (unlikely(!skb->ignore_df && skb->len > mtu)) |
590 | goto fail_toobig; | |
a34a101e | 591 | |
485fca66 FW |
592 | if (IP6CB(skb)->frag_max_size) { |
593 | if (IP6CB(skb)->frag_max_size > mtu) | |
594 | goto fail_toobig; | |
595 | ||
596 | /* don't send fragments larger than what we received */ | |
597 | mtu = IP6CB(skb)->frag_max_size; | |
598 | if (mtu < IPV6_MIN_MTU) | |
599 | mtu = IPV6_MIN_MTU; | |
b881ef76 JH |
600 | } |
601 | ||
d91675f9 YH |
602 | if (np && np->frag_size < mtu) { |
603 | if (np->frag_size) | |
604 | mtu = np->frag_size; | |
605 | } | |
89bc7848 | 606 | if (mtu < hlen + sizeof(struct frag_hdr) + 8) |
b72a2b01 | 607 | goto fail_toobig; |
1e0d69a9 | 608 | mtu -= hlen + sizeof(struct frag_hdr); |
1da177e4 | 609 | |
fd0273d7 MKL |
610 | frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr, |
611 | &ipv6_hdr(skb)->saddr); | |
286c2349 | 612 | |
405c92f7 HFS |
613 | if (skb->ip_summed == CHECKSUM_PARTIAL && |
614 | (err = skb_checksum_help(skb))) | |
615 | goto fail; | |
616 | ||
1d325d21 | 617 | hroom = LL_RESERVED_SPACE(rt->dst.dev); |
21dc3301 | 618 | if (skb_has_frag_list(skb)) { |
1da177e4 | 619 | int first_len = skb_pagelen(skb); |
3d13008e | 620 | struct sk_buff *frag2; |
1da177e4 LT |
621 | |
622 | if (first_len - hlen > mtu || | |
623 | ((first_len - hlen) & 7) || | |
1d325d21 FW |
624 | skb_cloned(skb) || |
625 | skb_headroom(skb) < (hroom + sizeof(struct frag_hdr))) | |
1da177e4 LT |
626 | goto slow_path; |
627 | ||
4d9092bb | 628 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
629 | /* Correct geometry. */ |
630 | if (frag->len > mtu || | |
631 | ((frag->len & 7) && frag->next) || | |
1d325d21 | 632 | skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr))) |
3d13008e | 633 | goto slow_path_clean; |
1da177e4 | 634 | |
1da177e4 LT |
635 | /* Partially cloned skb? */ |
636 | if (skb_shared(frag)) | |
3d13008e | 637 | goto slow_path_clean; |
2fdba6b0 HX |
638 | |
639 | BUG_ON(frag->sk); | |
640 | if (skb->sk) { | |
2fdba6b0 HX |
641 | frag->sk = skb->sk; |
642 | frag->destructor = sock_wfree; | |
2fdba6b0 | 643 | } |
3d13008e | 644 | skb->truesize -= frag->truesize; |
1da177e4 LT |
645 | } |
646 | ||
647 | err = 0; | |
648 | offset = 0; | |
1da177e4 LT |
649 | /* BUILD HEADER */ |
650 | ||
9a217a1c | 651 | *prevhdr = NEXTHDR_FRAGMENT; |
d56f90a7 | 652 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
1da177e4 | 653 | if (!tmp_hdr) { |
adf30907 | 654 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 655 | IPSTATS_MIB_FRAGFAILS); |
1d325d21 FW |
656 | err = -ENOMEM; |
657 | goto fail; | |
1da177e4 | 658 | } |
1d325d21 FW |
659 | frag = skb_shinfo(skb)->frag_list; |
660 | skb_frag_list_init(skb); | |
1da177e4 | 661 | |
1da177e4 | 662 | __skb_pull(skb, hlen); |
67ba4152 | 663 | fh = (struct frag_hdr *)__skb_push(skb, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
664 | __skb_push(skb, hlen); |
665 | skb_reset_network_header(skb); | |
d56f90a7 | 666 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
1da177e4 | 667 | |
1da177e4 LT |
668 | fh->nexthdr = nexthdr; |
669 | fh->reserved = 0; | |
670 | fh->frag_off = htons(IP6_MF); | |
286c2349 | 671 | fh->identification = frag_id; |
1da177e4 LT |
672 | |
673 | first_len = skb_pagelen(skb); | |
674 | skb->data_len = first_len - skb_headlen(skb); | |
675 | skb->len = first_len; | |
0660e03f ACM |
676 | ipv6_hdr(skb)->payload_len = htons(first_len - |
677 | sizeof(struct ipv6hdr)); | |
a11d206d | 678 | |
d8d1f30b | 679 | dst_hold(&rt->dst); |
1da177e4 LT |
680 | |
681 | for (;;) { | |
682 | /* Prepare header of the next frame, | |
683 | * before previous one went down. */ | |
684 | if (frag) { | |
685 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 686 | skb_reset_transport_header(frag); |
67ba4152 | 687 | fh = (struct frag_hdr *)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
688 | __skb_push(frag, hlen); |
689 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
690 | memcpy(skb_network_header(frag), tmp_hdr, |
691 | hlen); | |
1da177e4 LT |
692 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
693 | fh->nexthdr = nexthdr; | |
694 | fh->reserved = 0; | |
695 | fh->frag_off = htons(offset); | |
53b24b8f | 696 | if (frag->next) |
1da177e4 LT |
697 | fh->frag_off |= htons(IP6_MF); |
698 | fh->identification = frag_id; | |
0660e03f ACM |
699 | ipv6_hdr(frag)->payload_len = |
700 | htons(frag->len - | |
701 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
702 | ip6_copy_metadata(frag, skb); |
703 | } | |
1ab1457c | 704 | |
7d8c6e39 | 705 | err = output(net, sk, skb); |
67ba4152 | 706 | if (!err) |
d8d1f30b | 707 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 708 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 709 | |
1da177e4 LT |
710 | if (err || !frag) |
711 | break; | |
712 | ||
713 | skb = frag; | |
714 | frag = skb->next; | |
715 | skb->next = NULL; | |
716 | } | |
717 | ||
a51482bd | 718 | kfree(tmp_hdr); |
1da177e4 LT |
719 | |
720 | if (err == 0) { | |
d8d1f30b | 721 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 722 | IPSTATS_MIB_FRAGOKS); |
94e187c0 | 723 | ip6_rt_put(rt); |
1da177e4 LT |
724 | return 0; |
725 | } | |
726 | ||
46cfd725 | 727 | kfree_skb_list(frag); |
1da177e4 | 728 | |
d8d1f30b | 729 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 730 | IPSTATS_MIB_FRAGFAILS); |
94e187c0 | 731 | ip6_rt_put(rt); |
1da177e4 | 732 | return err; |
3d13008e ED |
733 | |
734 | slow_path_clean: | |
735 | skb_walk_frags(skb, frag2) { | |
736 | if (frag2 == frag) | |
737 | break; | |
738 | frag2->sk = NULL; | |
739 | frag2->destructor = NULL; | |
740 | skb->truesize += frag2->truesize; | |
741 | } | |
1da177e4 LT |
742 | } |
743 | ||
744 | slow_path: | |
745 | left = skb->len - hlen; /* Space per frame */ | |
746 | ptr = hlen; /* Where to start from */ | |
747 | ||
748 | /* | |
749 | * Fragment the datagram. | |
750 | */ | |
751 | ||
752 | *prevhdr = NEXTHDR_FRAGMENT; | |
a7ae1992 | 753 | troom = rt->dst.dev->needed_tailroom; |
1da177e4 LT |
754 | |
755 | /* | |
756 | * Keep copying data until we run out. | |
757 | */ | |
67ba4152 | 758 | while (left > 0) { |
1da177e4 LT |
759 | len = left; |
760 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
761 | if (len > mtu) | |
762 | len = mtu; | |
25985edc | 763 | /* IF: we are not sending up to and including the packet end |
1da177e4 LT |
764 | then align the next start on an eight byte boundary */ |
765 | if (len < left) { | |
766 | len &= ~7; | |
767 | } | |
1da177e4 | 768 | |
cbffccc9 JP |
769 | /* Allocate buffer */ |
770 | frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) + | |
771 | hroom + troom, GFP_ATOMIC); | |
772 | if (!frag) { | |
adf30907 | 773 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 774 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
775 | err = -ENOMEM; |
776 | goto fail; | |
777 | } | |
778 | ||
779 | /* | |
780 | * Set up data on packet | |
781 | */ | |
782 | ||
783 | ip6_copy_metadata(frag, skb); | |
a7ae1992 | 784 | skb_reserve(frag, hroom); |
1da177e4 | 785 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
c1d2bbe1 | 786 | skb_reset_network_header(frag); |
badff6d0 | 787 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
b0e380b1 ACM |
788 | frag->transport_header = (frag->network_header + hlen + |
789 | sizeof(struct frag_hdr)); | |
1da177e4 LT |
790 | |
791 | /* | |
792 | * Charge the memory for the fragment to any owner | |
793 | * it might possess | |
794 | */ | |
795 | if (skb->sk) | |
796 | skb_set_owner_w(frag, skb->sk); | |
797 | ||
798 | /* | |
799 | * Copy the packet header into the new buffer. | |
800 | */ | |
d626f62b | 801 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
1da177e4 LT |
802 | |
803 | /* | |
804 | * Build fragment header. | |
805 | */ | |
806 | fh->nexthdr = nexthdr; | |
807 | fh->reserved = 0; | |
286c2349 | 808 | fh->identification = frag_id; |
1da177e4 LT |
809 | |
810 | /* | |
811 | * Copy a block of the IP datagram. | |
812 | */ | |
e3f0b86b HS |
813 | BUG_ON(skb_copy_bits(skb, ptr, skb_transport_header(frag), |
814 | len)); | |
1da177e4 LT |
815 | left -= len; |
816 | ||
817 | fh->frag_off = htons(offset); | |
818 | if (left > 0) | |
819 | fh->frag_off |= htons(IP6_MF); | |
0660e03f ACM |
820 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
821 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
822 | |
823 | ptr += len; | |
824 | offset += len; | |
825 | ||
826 | /* | |
827 | * Put this fragment into the sending queue. | |
828 | */ | |
7d8c6e39 | 829 | err = output(net, sk, frag); |
1da177e4 LT |
830 | if (err) |
831 | goto fail; | |
dafee490 | 832 | |
adf30907 | 833 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 834 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 835 | } |
adf30907 | 836 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 837 | IPSTATS_MIB_FRAGOKS); |
808db80a | 838 | consume_skb(skb); |
1da177e4 LT |
839 | return err; |
840 | ||
485fca66 FW |
841 | fail_toobig: |
842 | if (skb->sk && dst_allfrag(skb_dst(skb))) | |
843 | sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK); | |
844 | ||
845 | skb->dev = skb_dst(skb)->dev; | |
846 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
847 | err = -EMSGSIZE; | |
848 | ||
1da177e4 | 849 | fail: |
adf30907 | 850 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 851 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 852 | kfree_skb(skb); |
1da177e4 LT |
853 | return err; |
854 | } | |
855 | ||
b71d1d42 ED |
856 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
857 | const struct in6_addr *fl_addr, | |
858 | const struct in6_addr *addr_cache) | |
cf6b1982 | 859 | { |
a02cec21 | 860 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
63159f29 | 861 | (!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache)); |
cf6b1982 YH |
862 | } |
863 | ||
497c615a HX |
864 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
865 | struct dst_entry *dst, | |
b71d1d42 | 866 | const struct flowi6 *fl6) |
1da177e4 | 867 | { |
497c615a | 868 | struct ipv6_pinfo *np = inet6_sk(sk); |
a963a37d | 869 | struct rt6_info *rt; |
1da177e4 | 870 | |
497c615a HX |
871 | if (!dst) |
872 | goto out; | |
873 | ||
a963a37d ED |
874 | if (dst->ops->family != AF_INET6) { |
875 | dst_release(dst); | |
876 | return NULL; | |
877 | } | |
878 | ||
879 | rt = (struct rt6_info *)dst; | |
497c615a HX |
880 | /* Yes, checking route validity in not connected |
881 | * case is not very simple. Take into account, | |
882 | * that we do not support routing by source, TOS, | |
67ba4152 | 883 | * and MSG_DONTROUTE --ANK (980726) |
497c615a | 884 | * |
cf6b1982 YH |
885 | * 1. ip6_rt_check(): If route was host route, |
886 | * check that cached destination is current. | |
497c615a HX |
887 | * If it is network route, we still may |
888 | * check its validity using saved pointer | |
889 | * to the last used address: daddr_cache. | |
890 | * We do not want to save whole address now, | |
891 | * (because main consumer of this service | |
892 | * is tcp, which has not this problem), | |
893 | * so that the last trick works only on connected | |
894 | * sockets. | |
895 | * 2. oif also should be the same. | |
896 | */ | |
4c9483b2 | 897 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
8e1ef0a9 | 898 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 899 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
8e1ef0a9 | 900 | #endif |
ca254490 DA |
901 | (!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) && |
902 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) { | |
497c615a HX |
903 | dst_release(dst); |
904 | dst = NULL; | |
1da177e4 LT |
905 | } |
906 | ||
497c615a HX |
907 | out: |
908 | return dst; | |
909 | } | |
910 | ||
3aef934f | 911 | static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk, |
4c9483b2 | 912 | struct dst_entry **dst, struct flowi6 *fl6) |
497c615a | 913 | { |
69cce1d1 DM |
914 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
915 | struct neighbour *n; | |
97cac082 | 916 | struct rt6_info *rt; |
69cce1d1 DM |
917 | #endif |
918 | int err; | |
6f21c96a | 919 | int flags = 0; |
497c615a | 920 | |
0d240e78 DA |
921 | if (ipv6_addr_any(&fl6->saddr) && fl6->flowi6_oif && |
922 | (!*dst || !(*dst)->error)) { | |
923 | err = l3mdev_get_saddr6(net, sk, fl6); | |
924 | if (err) | |
925 | goto out_err; | |
926 | } | |
927 | ||
e16e888b MS |
928 | /* The correct way to handle this would be to do |
929 | * ip6_route_get_saddr, and then ip6_route_output; however, | |
930 | * the route-specific preferred source forces the | |
931 | * ip6_route_output call _before_ ip6_route_get_saddr. | |
932 | * | |
933 | * In source specific routing (no src=any default route), | |
934 | * ip6_route_output will fail given src=any saddr, though, so | |
935 | * that's why we try it again later. | |
936 | */ | |
937 | if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) { | |
938 | struct rt6_info *rt; | |
939 | bool had_dst = *dst != NULL; | |
1da177e4 | 940 | |
e16e888b MS |
941 | if (!had_dst) |
942 | *dst = ip6_route_output(net, sk, fl6); | |
943 | rt = (*dst)->error ? NULL : (struct rt6_info *)*dst; | |
c3968a85 DW |
944 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, |
945 | sk ? inet6_sk(sk)->srcprefs : 0, | |
946 | &fl6->saddr); | |
44456d37 | 947 | if (err) |
1da177e4 | 948 | goto out_err_release; |
e16e888b MS |
949 | |
950 | /* If we had an erroneous initial result, pretend it | |
951 | * never existed and let the SA-enabled version take | |
952 | * over. | |
953 | */ | |
954 | if (!had_dst && (*dst)->error) { | |
955 | dst_release(*dst); | |
956 | *dst = NULL; | |
957 | } | |
6f21c96a PA |
958 | |
959 | if (fl6->flowi6_oif) | |
960 | flags |= RT6_LOOKUP_F_IFACE; | |
1da177e4 LT |
961 | } |
962 | ||
e16e888b | 963 | if (!*dst) |
6f21c96a | 964 | *dst = ip6_route_output_flags(net, sk, fl6, flags); |
e16e888b MS |
965 | |
966 | err = (*dst)->error; | |
967 | if (err) | |
968 | goto out_err_release; | |
969 | ||
95c385b4 | 970 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
971 | /* |
972 | * Here if the dst entry we've looked up | |
973 | * has a neighbour entry that is in the INCOMPLETE | |
974 | * state and the src address from the flow is | |
975 | * marked as OPTIMISTIC, we release the found | |
976 | * dst entry and replace it instead with the | |
977 | * dst entry of the nexthop router | |
978 | */ | |
c56bf6fe | 979 | rt = (struct rt6_info *) *dst; |
707be1ff | 980 | rcu_read_lock_bh(); |
2647a9b0 MKL |
981 | n = __ipv6_neigh_lookup_noref(rt->dst.dev, |
982 | rt6_nexthop(rt, &fl6->daddr)); | |
707be1ff YH |
983 | err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0; |
984 | rcu_read_unlock_bh(); | |
985 | ||
986 | if (err) { | |
e550dfb0 | 987 | struct inet6_ifaddr *ifp; |
4c9483b2 | 988 | struct flowi6 fl_gw6; |
e550dfb0 NH |
989 | int redirect; |
990 | ||
4c9483b2 | 991 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
e550dfb0 NH |
992 | (*dst)->dev, 1); |
993 | ||
994 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
995 | if (ifp) | |
996 | in6_ifa_put(ifp); | |
997 | ||
998 | if (redirect) { | |
999 | /* | |
1000 | * We need to get the dst entry for the | |
1001 | * default router instead | |
1002 | */ | |
1003 | dst_release(*dst); | |
4c9483b2 DM |
1004 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
1005 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
1006 | *dst = ip6_route_output(net, sk, &fl_gw6); | |
e5d08d71 IM |
1007 | err = (*dst)->error; |
1008 | if (err) | |
e550dfb0 | 1009 | goto out_err_release; |
95c385b4 | 1010 | } |
e550dfb0 | 1011 | } |
95c385b4 NH |
1012 | #endif |
1013 | ||
1da177e4 LT |
1014 | return 0; |
1015 | ||
1016 | out_err_release: | |
1017 | dst_release(*dst); | |
1018 | *dst = NULL; | |
0d240e78 DA |
1019 | out_err: |
1020 | if (err == -ENETUNREACH) | |
1021 | IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES); | |
1da177e4 LT |
1022 | return err; |
1023 | } | |
34a0b3cd | 1024 | |
497c615a HX |
1025 | /** |
1026 | * ip6_dst_lookup - perform route lookup on flow | |
1027 | * @sk: socket which provides route info | |
1028 | * @dst: pointer to dst_entry * for result | |
4c9483b2 | 1029 | * @fl6: flow to lookup |
497c615a HX |
1030 | * |
1031 | * This function performs a route lookup on the given flow. | |
1032 | * | |
1033 | * It returns zero on success, or a standard errno code on error. | |
1034 | */ | |
343d60aa RP |
1035 | int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, |
1036 | struct flowi6 *fl6) | |
497c615a HX |
1037 | { |
1038 | *dst = NULL; | |
343d60aa | 1039 | return ip6_dst_lookup_tail(net, sk, dst, fl6); |
497c615a | 1040 | } |
3cf3dc6c ACM |
1041 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
1042 | ||
497c615a | 1043 | /** |
68d0c6d3 DM |
1044 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
1045 | * @sk: socket which provides route info | |
4c9483b2 | 1046 | * @fl6: flow to lookup |
68d0c6d3 | 1047 | * @final_dst: final destination address for ipsec lookup |
68d0c6d3 DM |
1048 | * |
1049 | * This function performs a route lookup on the given flow. | |
1050 | * | |
1051 | * It returns a valid dst pointer on success, or a pointer encoded | |
1052 | * error code. | |
1053 | */ | |
3aef934f | 1054 | struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 1055 | const struct in6_addr *final_dst) |
68d0c6d3 DM |
1056 | { |
1057 | struct dst_entry *dst = NULL; | |
1058 | int err; | |
1059 | ||
343d60aa | 1060 | err = ip6_dst_lookup_tail(sock_net(sk), sk, &dst, fl6); |
68d0c6d3 DM |
1061 | if (err) |
1062 | return ERR_PTR(err); | |
1063 | if (final_dst) | |
4e3fd7a0 | 1064 | fl6->daddr = *final_dst; |
a0a9f33b | 1065 | if (!fl6->flowi6_oif) |
ca254490 | 1066 | fl6->flowi6_oif = l3mdev_fib_oif(dst->dev); |
2774c131 | 1067 | |
f92ee619 | 1068 | return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
68d0c6d3 DM |
1069 | } |
1070 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
1071 | ||
1072 | /** | |
1073 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
497c615a | 1074 | * @sk: socket which provides the dst cache and route info |
4c9483b2 | 1075 | * @fl6: flow to lookup |
68d0c6d3 | 1076 | * @final_dst: final destination address for ipsec lookup |
497c615a HX |
1077 | * |
1078 | * This function performs a route lookup on the given flow with the | |
1079 | * possibility of using the cached route in the socket if it is valid. | |
1080 | * It will take the socket dst lock when operating on the dst cache. | |
1081 | * As a result, this function can only be used in process context. | |
1082 | * | |
68d0c6d3 DM |
1083 | * It returns a valid dst pointer on success, or a pointer encoded |
1084 | * error code. | |
497c615a | 1085 | */ |
4c9483b2 | 1086 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 1087 | const struct in6_addr *final_dst) |
497c615a | 1088 | { |
68d0c6d3 | 1089 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
497c615a | 1090 | |
4c9483b2 | 1091 | dst = ip6_sk_dst_check(sk, dst, fl6); |
00bc0ef5 JS |
1092 | if (!dst) |
1093 | dst = ip6_dst_lookup_flow(sk, fl6, final_dst); | |
68d0c6d3 | 1094 | |
00bc0ef5 | 1095 | return dst; |
497c615a | 1096 | } |
68d0c6d3 | 1097 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
497c615a | 1098 | |
34a0b3cd | 1099 | static inline int ip6_ufo_append_data(struct sock *sk, |
0bbe84a6 | 1100 | struct sk_buff_head *queue, |
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, | |
3ba3458f JS |
1104 | int exthdrlen, int transhdrlen, int mtu, |
1105 | unsigned int flags, const struct flowi6 *fl6) | |
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 | */ | |
0bbe84a6 | 1115 | skb = skb_peek_tail(queue); |
63159f29 | 1116 | if (!skb) { |
e89e9cf5 AR |
1117 | skb = sock_alloc_send_skb(sk, |
1118 | hh_len + fragheaderlen + transhdrlen + 20, | |
1119 | (flags & MSG_DONTWAIT), &err); | |
63159f29 | 1120 | if (!skb) |
504744e4 | 1121 | return err; |
e89e9cf5 AR |
1122 | |
1123 | /* reserve space for Hardware header */ | |
1124 | skb_reserve(skb, hh_len); | |
1125 | ||
1126 | /* create space for UDP/IP header */ | |
67ba4152 | 1127 | skb_put(skb, fragheaderlen + transhdrlen); |
e89e9cf5 AR |
1128 | |
1129 | /* initialize network header pointer */ | |
3ba3458f | 1130 | skb_set_network_header(skb, exthdrlen); |
e89e9cf5 AR |
1131 | |
1132 | /* initialize protocol header pointer */ | |
b0e380b1 | 1133 | skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf5 | 1134 | |
9c9c9ad5 | 1135 | skb->protocol = htons(ETH_P_IPV6); |
e89e9cf5 | 1136 | skb->csum = 0; |
e89e9cf5 | 1137 | |
0bbe84a6 | 1138 | __skb_queue_tail(queue, skb); |
c547dbf5 JP |
1139 | } else if (skb_is_gso(skb)) { |
1140 | goto append; | |
e89e9cf5 | 1141 | } |
e89e9cf5 | 1142 | |
c547dbf5 JP |
1143 | skb->ip_summed = CHECKSUM_PARTIAL; |
1144 | /* Specify the length of each IPv6 datagram fragment. | |
1145 | * It has to be a multiple of 8. | |
1146 | */ | |
1147 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - | |
1148 | sizeof(struct frag_hdr)) & ~7; | |
1149 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
fd0273d7 MKL |
1150 | skb_shinfo(skb)->ip6_frag_id = ipv6_select_ident(sock_net(sk), |
1151 | &fl6->daddr, | |
1152 | &fl6->saddr); | |
c547dbf5 JP |
1153 | |
1154 | append: | |
2811ebac HFS |
1155 | return skb_append_datato_frags(sk, skb, getfrag, from, |
1156 | (length - transhdrlen)); | |
e89e9cf5 | 1157 | } |
1da177e4 | 1158 | |
0178b695 HX |
1159 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1160 | gfp_t gfp) | |
1161 | { | |
1162 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1163 | } | |
1164 | ||
1165 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1166 | gfp_t gfp) | |
1167 | { | |
1168 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1169 | } | |
1170 | ||
75a493e6 | 1171 | static void ip6_append_data_mtu(unsigned int *mtu, |
0c183379 G |
1172 | int *maxfraglen, |
1173 | unsigned int fragheaderlen, | |
1174 | struct sk_buff *skb, | |
75a493e6 | 1175 | struct rt6_info *rt, |
e367c2d0 | 1176 | unsigned int orig_mtu) |
0c183379 G |
1177 | { |
1178 | if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { | |
63159f29 | 1179 | if (!skb) { |
0c183379 | 1180 | /* first fragment, reserve header_len */ |
e367c2d0 | 1181 | *mtu = orig_mtu - rt->dst.header_len; |
0c183379 G |
1182 | |
1183 | } else { | |
1184 | /* | |
1185 | * this fragment is not first, the headers | |
1186 | * space is regarded as data space. | |
1187 | */ | |
e367c2d0 | 1188 | *mtu = orig_mtu; |
0c183379 G |
1189 | } |
1190 | *maxfraglen = ((*mtu - fragheaderlen) & ~7) | |
1191 | + fragheaderlen - sizeof(struct frag_hdr); | |
1192 | } | |
1193 | } | |
1194 | ||
366e41d9 | 1195 | static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork, |
26879da5 | 1196 | struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6, |
366e41d9 VY |
1197 | struct rt6_info *rt, struct flowi6 *fl6) |
1198 | { | |
1199 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1200 | unsigned int mtu; | |
26879da5 | 1201 | struct ipv6_txoptions *opt = ipc6->opt; |
366e41d9 VY |
1202 | |
1203 | /* | |
1204 | * setup for corking | |
1205 | */ | |
1206 | if (opt) { | |
1207 | if (WARN_ON(v6_cork->opt)) | |
1208 | return -EINVAL; | |
1209 | ||
1210 | v6_cork->opt = kzalloc(opt->tot_len, sk->sk_allocation); | |
63159f29 | 1211 | if (unlikely(!v6_cork->opt)) |
366e41d9 VY |
1212 | return -ENOBUFS; |
1213 | ||
1214 | v6_cork->opt->tot_len = opt->tot_len; | |
1215 | v6_cork->opt->opt_flen = opt->opt_flen; | |
1216 | v6_cork->opt->opt_nflen = opt->opt_nflen; | |
1217 | ||
1218 | v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
1219 | sk->sk_allocation); | |
1220 | if (opt->dst0opt && !v6_cork->opt->dst0opt) | |
1221 | return -ENOBUFS; | |
1222 | ||
1223 | v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
1224 | sk->sk_allocation); | |
1225 | if (opt->dst1opt && !v6_cork->opt->dst1opt) | |
1226 | return -ENOBUFS; | |
1227 | ||
1228 | v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt, | |
1229 | sk->sk_allocation); | |
1230 | if (opt->hopopt && !v6_cork->opt->hopopt) | |
1231 | return -ENOBUFS; | |
1232 | ||
1233 | v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
1234 | sk->sk_allocation); | |
1235 | if (opt->srcrt && !v6_cork->opt->srcrt) | |
1236 | return -ENOBUFS; | |
1237 | ||
1238 | /* need source address above miyazawa*/ | |
1239 | } | |
1240 | dst_hold(&rt->dst); | |
1241 | cork->base.dst = &rt->dst; | |
1242 | cork->fl.u.ip6 = *fl6; | |
26879da5 WW |
1243 | v6_cork->hop_limit = ipc6->hlimit; |
1244 | v6_cork->tclass = ipc6->tclass; | |
366e41d9 VY |
1245 | if (rt->dst.flags & DST_XFRM_TUNNEL) |
1246 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? | |
1247 | rt->dst.dev->mtu : dst_mtu(&rt->dst); | |
1248 | else | |
1249 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? | |
1250 | rt->dst.dev->mtu : dst_mtu(rt->dst.path); | |
1251 | if (np->frag_size < mtu) { | |
1252 | if (np->frag_size) | |
1253 | mtu = np->frag_size; | |
1254 | } | |
1255 | cork->base.fragsize = mtu; | |
1256 | if (dst_allfrag(rt->dst.path)) | |
1257 | cork->base.flags |= IPCORK_ALLFRAG; | |
1258 | cork->base.length = 0; | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
0bbe84a6 VY |
1263 | static int __ip6_append_data(struct sock *sk, |
1264 | struct flowi6 *fl6, | |
1265 | struct sk_buff_head *queue, | |
1266 | struct inet_cork *cork, | |
1267 | struct inet6_cork *v6_cork, | |
1268 | struct page_frag *pfrag, | |
1269 | int getfrag(void *from, char *to, int offset, | |
1270 | int len, int odd, struct sk_buff *skb), | |
1271 | void *from, int length, int transhdrlen, | |
26879da5 | 1272 | unsigned int flags, struct ipcm6_cookie *ipc6, |
c14ac945 | 1273 | const struct sockcm_cookie *sockc) |
1da177e4 | 1274 | { |
0c183379 | 1275 | struct sk_buff *skb, *skb_prev = NULL; |
e367c2d0 | 1276 | unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu; |
0bbe84a6 VY |
1277 | int exthdrlen = 0; |
1278 | int dst_exthdrlen = 0; | |
1da177e4 | 1279 | int hh_len; |
1da177e4 LT |
1280 | int copy; |
1281 | int err; | |
1282 | int offset = 0; | |
a693e698 | 1283 | __u8 tx_flags = 0; |
09c2d251 | 1284 | u32 tskey = 0; |
0bbe84a6 VY |
1285 | struct rt6_info *rt = (struct rt6_info *)cork->dst; |
1286 | struct ipv6_txoptions *opt = v6_cork->opt; | |
32dce968 | 1287 | int csummode = CHECKSUM_NONE; |
682b1a9d | 1288 | unsigned int maxnonfragsize, headersize; |
1da177e4 | 1289 | |
0bbe84a6 VY |
1290 | skb = skb_peek_tail(queue); |
1291 | if (!skb) { | |
1292 | exthdrlen = opt ? opt->opt_flen : 0; | |
7efdba5b | 1293 | dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; |
1da177e4 | 1294 | } |
0bbe84a6 | 1295 | |
366e41d9 | 1296 | mtu = cork->fragsize; |
e367c2d0 | 1297 | orig_mtu = mtu; |
1da177e4 | 1298 | |
d8d1f30b | 1299 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4 | 1300 | |
a1b05140 | 1301 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1302 | (opt ? opt->opt_nflen : 0); |
4df98e76 HFS |
1303 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - |
1304 | sizeof(struct frag_hdr); | |
1da177e4 | 1305 | |
682b1a9d HFS |
1306 | headersize = sizeof(struct ipv6hdr) + |
1307 | (opt ? opt->opt_flen + opt->opt_nflen : 0) + | |
1308 | (dst_allfrag(&rt->dst) ? | |
1309 | sizeof(struct frag_hdr) : 0) + | |
1310 | rt->rt6i_nfheader_len; | |
1311 | ||
26879da5 | 1312 | if (cork->length + length > mtu - headersize && ipc6->dontfrag && |
682b1a9d HFS |
1313 | (sk->sk_protocol == IPPROTO_UDP || |
1314 | sk->sk_protocol == IPPROTO_RAW)) { | |
1315 | ipv6_local_rxpmtu(sk, fl6, mtu - headersize + | |
1316 | sizeof(struct ipv6hdr)); | |
1317 | goto emsgsize; | |
1318 | } | |
4df98e76 | 1319 | |
682b1a9d HFS |
1320 | if (ip6_sk_ignore_df(sk)) |
1321 | maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN; | |
1322 | else | |
1323 | maxnonfragsize = mtu; | |
4df98e76 | 1324 | |
682b1a9d | 1325 | if (cork->length + length > maxnonfragsize - headersize) { |
4df98e76 | 1326 | emsgsize: |
682b1a9d HFS |
1327 | ipv6_local_error(sk, EMSGSIZE, fl6, |
1328 | mtu - headersize + | |
1329 | sizeof(struct ipv6hdr)); | |
1330 | return -EMSGSIZE; | |
1da177e4 LT |
1331 | } |
1332 | ||
682b1a9d HFS |
1333 | /* CHECKSUM_PARTIAL only with no extension headers and when |
1334 | * we are not going to fragment | |
1335 | */ | |
1336 | if (transhdrlen && sk->sk_protocol == IPPROTO_UDP && | |
1337 | headersize == sizeof(struct ipv6hdr) && | |
1338 | length < mtu - headersize && | |
1339 | !(flags & MSG_MORE) && | |
c8cd0989 | 1340 | rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM)) |
682b1a9d HFS |
1341 | csummode = CHECKSUM_PARTIAL; |
1342 | ||
09c2d251 | 1343 | if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_RAW) { |
c14ac945 | 1344 | sock_tx_timestamp(sk, sockc->tsflags, &tx_flags); |
09c2d251 WB |
1345 | if (tx_flags & SKBTX_ANY_SW_TSTAMP && |
1346 | sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) | |
1347 | tskey = sk->sk_tskey++; | |
1348 | } | |
a693e698 | 1349 | |
1da177e4 LT |
1350 | /* |
1351 | * Let's try using as much space as possible. | |
1352 | * Use MTU if total length of the message fits into the MTU. | |
1353 | * Otherwise, we need to reserve fragment header and | |
1354 | * fragment alignment (= 8-15 octects, in total). | |
1355 | * | |
1356 | * Note that we may need to "move" the data from the tail of | |
1ab1457c | 1357 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1358 | * the message. |
1359 | * | |
1ab1457c | 1360 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1361 | * at once if non-fragmentable extension headers |
1362 | * are too large. | |
1ab1457c | 1363 | * --yoshfuji |
1da177e4 LT |
1364 | */ |
1365 | ||
2811ebac HFS |
1366 | cork->length += length; |
1367 | if (((length > mtu) || | |
1368 | (skb && skb_is_gso(skb))) && | |
1369 | (sk->sk_protocol == IPPROTO_UDP) && | |
acf8dd0a | 1370 | (rt->dst.dev->features & NETIF_F_UFO) && |
40ba3302 | 1371 | (sk->sk_type == SOCK_DGRAM) && !udp_get_no_check6_tx(sk)) { |
0bbe84a6 | 1372 | err = ip6_ufo_append_data(sk, queue, getfrag, from, length, |
3ba3458f | 1373 | hh_len, fragheaderlen, exthdrlen, |
fd0273d7 | 1374 | transhdrlen, mtu, flags, fl6); |
2811ebac HFS |
1375 | if (err) |
1376 | goto error; | |
1377 | return 0; | |
e89e9cf5 | 1378 | } |
1da177e4 | 1379 | |
2811ebac | 1380 | if (!skb) |
1da177e4 LT |
1381 | goto alloc_new_skb; |
1382 | ||
1383 | while (length > 0) { | |
1384 | /* Check if the remaining data fits into current packet. */ | |
bdc712b4 | 1385 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
1da177e4 LT |
1386 | if (copy < length) |
1387 | copy = maxfraglen - skb->len; | |
1388 | ||
1389 | if (copy <= 0) { | |
1390 | char *data; | |
1391 | unsigned int datalen; | |
1392 | unsigned int fraglen; | |
1393 | unsigned int fraggap; | |
1394 | unsigned int alloclen; | |
1da177e4 | 1395 | alloc_new_skb: |
1da177e4 | 1396 | /* There's no room in the current skb */ |
0c183379 G |
1397 | if (skb) |
1398 | fraggap = skb->len - maxfraglen; | |
1da177e4 LT |
1399 | else |
1400 | fraggap = 0; | |
0c183379 | 1401 | /* update mtu and maxfraglen if necessary */ |
63159f29 | 1402 | if (!skb || !skb_prev) |
0c183379 | 1403 | ip6_append_data_mtu(&mtu, &maxfraglen, |
75a493e6 | 1404 | fragheaderlen, skb, rt, |
e367c2d0 | 1405 | orig_mtu); |
0c183379 G |
1406 | |
1407 | skb_prev = skb; | |
1da177e4 LT |
1408 | |
1409 | /* | |
1410 | * If remaining data exceeds the mtu, | |
1411 | * we know we need more fragment(s). | |
1412 | */ | |
1413 | datalen = length + fraggap; | |
1da177e4 | 1414 | |
0c183379 G |
1415 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
1416 | datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; | |
1da177e4 | 1417 | if ((flags & MSG_MORE) && |
d8d1f30b | 1418 | !(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4 LT |
1419 | alloclen = mtu; |
1420 | else | |
1421 | alloclen = datalen + fragheaderlen; | |
1422 | ||
299b0767 SK |
1423 | alloclen += dst_exthdrlen; |
1424 | ||
0c183379 G |
1425 | if (datalen != length + fraggap) { |
1426 | /* | |
1427 | * this is not the last fragment, the trailer | |
1428 | * space is regarded as data space. | |
1429 | */ | |
1430 | datalen += rt->dst.trailer_len; | |
1431 | } | |
1432 | ||
1433 | alloclen += rt->dst.trailer_len; | |
1434 | fraglen = datalen + fragheaderlen; | |
1da177e4 LT |
1435 | |
1436 | /* | |
1437 | * We just reserve space for fragment header. | |
1ab1457c | 1438 | * Note: this may be overallocation if the message |
1da177e4 LT |
1439 | * (without MSG_MORE) fits into the MTU. |
1440 | */ | |
1441 | alloclen += sizeof(struct frag_hdr); | |
1442 | ||
1443 | if (transhdrlen) { | |
1444 | skb = sock_alloc_send_skb(sk, | |
1445 | alloclen + hh_len, | |
1446 | (flags & MSG_DONTWAIT), &err); | |
1447 | } else { | |
1448 | skb = NULL; | |
1449 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1450 | 2 * sk->sk_sndbuf) | |
1451 | skb = sock_wmalloc(sk, | |
1452 | alloclen + hh_len, 1, | |
1453 | sk->sk_allocation); | |
63159f29 | 1454 | if (unlikely(!skb)) |
1da177e4 LT |
1455 | err = -ENOBUFS; |
1456 | } | |
63159f29 | 1457 | if (!skb) |
1da177e4 LT |
1458 | goto error; |
1459 | /* | |
1460 | * Fill in the control structures | |
1461 | */ | |
9c9c9ad5 | 1462 | skb->protocol = htons(ETH_P_IPV6); |
32dce968 | 1463 | skb->ip_summed = csummode; |
1da177e4 | 1464 | skb->csum = 0; |
1f85851e G |
1465 | /* reserve for fragmentation and ipsec header */ |
1466 | skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + | |
1467 | dst_exthdrlen); | |
1da177e4 | 1468 | |
11878b40 WB |
1469 | /* Only the initial fragment is time stamped */ |
1470 | skb_shinfo(skb)->tx_flags = tx_flags; | |
1471 | tx_flags = 0; | |
09c2d251 WB |
1472 | skb_shinfo(skb)->tskey = tskey; |
1473 | tskey = 0; | |
a693e698 | 1474 | |
1da177e4 LT |
1475 | /* |
1476 | * Find where to start putting bytes | |
1477 | */ | |
1f85851e G |
1478 | data = skb_put(skb, fraglen); |
1479 | skb_set_network_header(skb, exthdrlen); | |
1480 | data += fragheaderlen; | |
b0e380b1 ACM |
1481 | skb->transport_header = (skb->network_header + |
1482 | fragheaderlen); | |
1da177e4 LT |
1483 | if (fraggap) { |
1484 | skb->csum = skb_copy_and_csum_bits( | |
1485 | skb_prev, maxfraglen, | |
1486 | data + transhdrlen, fraggap, 0); | |
1487 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1488 | skb->csum); | |
1489 | data += fraggap; | |
e9fa4f7b | 1490 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1491 | } |
1492 | copy = datalen - transhdrlen - fraggap; | |
299b0767 | 1493 | |
1da177e4 LT |
1494 | if (copy < 0) { |
1495 | err = -EINVAL; | |
1496 | kfree_skb(skb); | |
1497 | goto error; | |
1498 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1499 | err = -EFAULT; | |
1500 | kfree_skb(skb); | |
1501 | goto error; | |
1502 | } | |
1503 | ||
1504 | offset += copy; | |
1505 | length -= datalen - fraggap; | |
1506 | transhdrlen = 0; | |
1507 | exthdrlen = 0; | |
299b0767 | 1508 | dst_exthdrlen = 0; |
1da177e4 LT |
1509 | |
1510 | /* | |
1511 | * Put the packet on the pending queue | |
1512 | */ | |
0bbe84a6 | 1513 | __skb_queue_tail(queue, skb); |
1da177e4 LT |
1514 | continue; |
1515 | } | |
1516 | ||
1517 | if (copy > length) | |
1518 | copy = length; | |
1519 | ||
d8d1f30b | 1520 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
1da177e4 LT |
1521 | unsigned int off; |
1522 | ||
1523 | off = skb->len; | |
1524 | if (getfrag(from, skb_put(skb, copy), | |
1525 | offset, copy, off, skb) < 0) { | |
1526 | __skb_trim(skb, off); | |
1527 | err = -EFAULT; | |
1528 | goto error; | |
1529 | } | |
1530 | } else { | |
1531 | int i = skb_shinfo(skb)->nr_frags; | |
1da177e4 | 1532 | |
5640f768 ED |
1533 | err = -ENOMEM; |
1534 | if (!sk_page_frag_refill(sk, pfrag)) | |
1da177e4 | 1535 | goto error; |
5640f768 ED |
1536 | |
1537 | if (!skb_can_coalesce(skb, i, pfrag->page, | |
1538 | pfrag->offset)) { | |
1539 | err = -EMSGSIZE; | |
1540 | if (i == MAX_SKB_FRAGS) | |
1541 | goto error; | |
1542 | ||
1543 | __skb_fill_page_desc(skb, i, pfrag->page, | |
1544 | pfrag->offset, 0); | |
1545 | skb_shinfo(skb)->nr_frags = ++i; | |
1546 | get_page(pfrag->page); | |
1da177e4 | 1547 | } |
5640f768 | 1548 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
9e903e08 | 1549 | if (getfrag(from, |
5640f768 ED |
1550 | page_address(pfrag->page) + pfrag->offset, |
1551 | offset, copy, skb->len, skb) < 0) | |
1552 | goto error_efault; | |
1553 | ||
1554 | pfrag->offset += copy; | |
1555 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1da177e4 LT |
1556 | skb->len += copy; |
1557 | skb->data_len += copy; | |
f945fa7a HX |
1558 | skb->truesize += copy; |
1559 | atomic_add(copy, &sk->sk_wmem_alloc); | |
1da177e4 LT |
1560 | } |
1561 | offset += copy; | |
1562 | length -= copy; | |
1563 | } | |
5640f768 | 1564 | |
1da177e4 | 1565 | return 0; |
5640f768 ED |
1566 | |
1567 | error_efault: | |
1568 | err = -EFAULT; | |
1da177e4 | 1569 | error: |
bdc712b4 | 1570 | cork->length -= length; |
3bd653c8 | 1571 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1572 | return err; |
1573 | } | |
0bbe84a6 VY |
1574 | |
1575 | int ip6_append_data(struct sock *sk, | |
1576 | int getfrag(void *from, char *to, int offset, int len, | |
1577 | int odd, struct sk_buff *skb), | |
26879da5 WW |
1578 | void *from, int length, int transhdrlen, |
1579 | struct ipcm6_cookie *ipc6, struct flowi6 *fl6, | |
1580 | struct rt6_info *rt, unsigned int flags, | |
c14ac945 | 1581 | const struct sockcm_cookie *sockc) |
0bbe84a6 VY |
1582 | { |
1583 | struct inet_sock *inet = inet_sk(sk); | |
1584 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1585 | int exthdrlen; | |
1586 | int err; | |
1587 | ||
1588 | if (flags&MSG_PROBE) | |
1589 | return 0; | |
1590 | if (skb_queue_empty(&sk->sk_write_queue)) { | |
1591 | /* | |
1592 | * setup for corking | |
1593 | */ | |
26879da5 WW |
1594 | err = ip6_setup_cork(sk, &inet->cork, &np->cork, |
1595 | ipc6, rt, fl6); | |
0bbe84a6 VY |
1596 | if (err) |
1597 | return err; | |
1598 | ||
26879da5 | 1599 | exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0); |
0bbe84a6 VY |
1600 | length += exthdrlen; |
1601 | transhdrlen += exthdrlen; | |
1602 | } else { | |
1603 | fl6 = &inet->cork.fl.u.ip6; | |
1604 | transhdrlen = 0; | |
1605 | } | |
1606 | ||
1607 | return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base, | |
1608 | &np->cork, sk_page_frag(sk), getfrag, | |
26879da5 | 1609 | from, length, transhdrlen, flags, ipc6, sockc); |
0bbe84a6 | 1610 | } |
a495f836 | 1611 | EXPORT_SYMBOL_GPL(ip6_append_data); |
1da177e4 | 1612 | |
366e41d9 VY |
1613 | static void ip6_cork_release(struct inet_cork_full *cork, |
1614 | struct inet6_cork *v6_cork) | |
bf138862 | 1615 | { |
366e41d9 VY |
1616 | if (v6_cork->opt) { |
1617 | kfree(v6_cork->opt->dst0opt); | |
1618 | kfree(v6_cork->opt->dst1opt); | |
1619 | kfree(v6_cork->opt->hopopt); | |
1620 | kfree(v6_cork->opt->srcrt); | |
1621 | kfree(v6_cork->opt); | |
1622 | v6_cork->opt = NULL; | |
0178b695 HX |
1623 | } |
1624 | ||
366e41d9 VY |
1625 | if (cork->base.dst) { |
1626 | dst_release(cork->base.dst); | |
1627 | cork->base.dst = NULL; | |
1628 | cork->base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 | 1629 | } |
366e41d9 | 1630 | memset(&cork->fl, 0, sizeof(cork->fl)); |
bf138862 PE |
1631 | } |
1632 | ||
6422398c VY |
1633 | struct sk_buff *__ip6_make_skb(struct sock *sk, |
1634 | struct sk_buff_head *queue, | |
1635 | struct inet_cork_full *cork, | |
1636 | struct inet6_cork *v6_cork) | |
1da177e4 LT |
1637 | { |
1638 | struct sk_buff *skb, *tmp_skb; | |
1639 | struct sk_buff **tail_skb; | |
1640 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1da177e4 | 1641 | struct ipv6_pinfo *np = inet6_sk(sk); |
3bd653c8 | 1642 | struct net *net = sock_net(sk); |
1da177e4 | 1643 | struct ipv6hdr *hdr; |
6422398c VY |
1644 | struct ipv6_txoptions *opt = v6_cork->opt; |
1645 | struct rt6_info *rt = (struct rt6_info *)cork->base.dst; | |
1646 | struct flowi6 *fl6 = &cork->fl.u.ip6; | |
4c9483b2 | 1647 | unsigned char proto = fl6->flowi6_proto; |
1da177e4 | 1648 | |
6422398c | 1649 | skb = __skb_dequeue(queue); |
63159f29 | 1650 | if (!skb) |
1da177e4 LT |
1651 | goto out; |
1652 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1653 | ||
1654 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1655 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1656 | __skb_pull(skb, skb_network_offset(skb)); |
6422398c | 1657 | while ((tmp_skb = __skb_dequeue(queue)) != NULL) { |
cfe1fc77 | 1658 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1659 | *tail_skb = tmp_skb; |
1660 | tail_skb = &(tmp_skb->next); | |
1661 | skb->len += tmp_skb->len; | |
1662 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1663 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1664 | tmp_skb->destructor = NULL; |
1665 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1666 | } |
1667 | ||
28a89453 | 1668 | /* Allow local fragmentation. */ |
60ff7467 | 1669 | skb->ignore_df = ip6_sk_ignore_df(sk); |
28a89453 | 1670 | |
4e3fd7a0 | 1671 | *final_dst = fl6->daddr; |
cfe1fc77 | 1672 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1673 | if (opt && opt->opt_flen) |
1674 | ipv6_push_frag_opts(skb, opt, &proto); | |
1675 | if (opt && opt->opt_nflen) | |
1676 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1677 | ||
e2d1bca7 ACM |
1678 | skb_push(skb, sizeof(struct ipv6hdr)); |
1679 | skb_reset_network_header(skb); | |
0660e03f | 1680 | hdr = ipv6_hdr(skb); |
1ab1457c | 1681 | |
6422398c | 1682 | ip6_flow_hdr(hdr, v6_cork->tclass, |
cb1ce2ef | 1683 | ip6_make_flowlabel(net, skb, fl6->flowlabel, |
67800f9b | 1684 | np->autoflowlabel, fl6)); |
6422398c | 1685 | hdr->hop_limit = v6_cork->hop_limit; |
1da177e4 | 1686 | hdr->nexthdr = proto; |
4e3fd7a0 AD |
1687 | hdr->saddr = fl6->saddr; |
1688 | hdr->daddr = *final_dst; | |
1da177e4 | 1689 | |
a2c2064f | 1690 | skb->priority = sk->sk_priority; |
4a19ec58 | 1691 | skb->mark = sk->sk_mark; |
a2c2064f | 1692 | |
d8d1f30b | 1693 | skb_dst_set(skb, dst_clone(&rt->dst)); |
edf391ff | 1694 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1695 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1696 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1697 | |
43a43b60 HFS |
1698 | ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type); |
1699 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); | |
14878f75 DS |
1700 | } |
1701 | ||
6422398c VY |
1702 | ip6_cork_release(cork, v6_cork); |
1703 | out: | |
1704 | return skb; | |
1705 | } | |
1706 | ||
1707 | int ip6_send_skb(struct sk_buff *skb) | |
1708 | { | |
1709 | struct net *net = sock_net(skb->sk); | |
1710 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); | |
1711 | int err; | |
1712 | ||
33224b16 | 1713 | err = ip6_local_out(net, skb->sk, skb); |
1da177e4 LT |
1714 | if (err) { |
1715 | if (err > 0) | |
6ce9e7b5 | 1716 | err = net_xmit_errno(err); |
1da177e4 | 1717 | if (err) |
6422398c VY |
1718 | IP6_INC_STATS(net, rt->rt6i_idev, |
1719 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
1720 | } |
1721 | ||
1da177e4 | 1722 | return err; |
6422398c VY |
1723 | } |
1724 | ||
1725 | int ip6_push_pending_frames(struct sock *sk) | |
1726 | { | |
1727 | struct sk_buff *skb; | |
1728 | ||
1729 | skb = ip6_finish_skb(sk); | |
1730 | if (!skb) | |
1731 | return 0; | |
1732 | ||
1733 | return ip6_send_skb(skb); | |
1da177e4 | 1734 | } |
a495f836 | 1735 | EXPORT_SYMBOL_GPL(ip6_push_pending_frames); |
1da177e4 | 1736 | |
0bbe84a6 | 1737 | static void __ip6_flush_pending_frames(struct sock *sk, |
6422398c VY |
1738 | struct sk_buff_head *queue, |
1739 | struct inet_cork_full *cork, | |
1740 | struct inet6_cork *v6_cork) | |
1da177e4 | 1741 | { |
1da177e4 LT |
1742 | struct sk_buff *skb; |
1743 | ||
0bbe84a6 | 1744 | while ((skb = __skb_dequeue_tail(queue)) != NULL) { |
adf30907 ED |
1745 | if (skb_dst(skb)) |
1746 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1747 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1748 | kfree_skb(skb); |
1749 | } | |
1750 | ||
6422398c | 1751 | ip6_cork_release(cork, v6_cork); |
1da177e4 | 1752 | } |
0bbe84a6 VY |
1753 | |
1754 | void ip6_flush_pending_frames(struct sock *sk) | |
1755 | { | |
6422398c VY |
1756 | __ip6_flush_pending_frames(sk, &sk->sk_write_queue, |
1757 | &inet_sk(sk)->cork, &inet6_sk(sk)->cork); | |
0bbe84a6 | 1758 | } |
a495f836 | 1759 | EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); |
6422398c VY |
1760 | |
1761 | struct sk_buff *ip6_make_skb(struct sock *sk, | |
1762 | int getfrag(void *from, char *to, int offset, | |
1763 | int len, int odd, struct sk_buff *skb), | |
1764 | void *from, int length, int transhdrlen, | |
26879da5 | 1765 | struct ipcm6_cookie *ipc6, struct flowi6 *fl6, |
6422398c | 1766 | struct rt6_info *rt, unsigned int flags, |
26879da5 | 1767 | const struct sockcm_cookie *sockc) |
6422398c VY |
1768 | { |
1769 | struct inet_cork_full cork; | |
1770 | struct inet6_cork v6_cork; | |
1771 | struct sk_buff_head queue; | |
26879da5 | 1772 | int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0); |
6422398c VY |
1773 | int err; |
1774 | ||
1775 | if (flags & MSG_PROBE) | |
1776 | return NULL; | |
1777 | ||
1778 | __skb_queue_head_init(&queue); | |
1779 | ||
1780 | cork.base.flags = 0; | |
1781 | cork.base.addr = 0; | |
1782 | cork.base.opt = NULL; | |
1783 | v6_cork.opt = NULL; | |
26879da5 | 1784 | err = ip6_setup_cork(sk, &cork, &v6_cork, ipc6, rt, fl6); |
6422398c VY |
1785 | if (err) |
1786 | return ERR_PTR(err); | |
1787 | ||
26879da5 WW |
1788 | if (ipc6->dontfrag < 0) |
1789 | ipc6->dontfrag = inet6_sk(sk)->dontfrag; | |
6422398c VY |
1790 | |
1791 | err = __ip6_append_data(sk, fl6, &queue, &cork.base, &v6_cork, | |
1792 | ¤t->task_frag, getfrag, from, | |
1793 | length + exthdrlen, transhdrlen + exthdrlen, | |
26879da5 | 1794 | flags, ipc6, sockc); |
6422398c VY |
1795 | if (err) { |
1796 | __ip6_flush_pending_frames(sk, &queue, &cork, &v6_cork); | |
1797 | return ERR_PTR(err); | |
1798 | } | |
1799 | ||
1800 | return __ip6_make_skb(sk, &queue, &cork, &v6_cork); | |
1801 | } |