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> |
1da177e4 | 58 | |
9e508490 | 59 | static int ip6_finish_output2(struct sk_buff *skb) |
1da177e4 | 60 | { |
adf30907 | 61 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 62 | struct net_device *dev = dst->dev; |
f6b72b62 | 63 | struct neighbour *neigh; |
6fd6ce20 YH |
64 | struct in6_addr *nexthop; |
65 | int ret; | |
1da177e4 LT |
66 | |
67 | skb->protocol = htons(ETH_P_IPV6); | |
68 | skb->dev = dev; | |
69 | ||
0660e03f | 70 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
adf30907 | 71 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
1da177e4 | 72 | |
7ad6848c | 73 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) && |
d1db275d | 74 | ((mroute6_socket(dev_net(dev), skb) && |
bd91b8bf | 75 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
7bc570c8 YH |
76 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
77 | &ipv6_hdr(skb)->saddr))) { | |
1da177e4 LT |
78 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
79 | ||
80 | /* Do not check for IFF_ALLMULTI; multicast routing | |
81 | is not supported in any case. | |
82 | */ | |
83 | if (newskb) | |
b2e0b385 JE |
84 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
85 | newskb, NULL, newskb->dev, | |
95603e22 | 86 | dev_loopback_xmit); |
1da177e4 | 87 | |
0660e03f | 88 | if (ipv6_hdr(skb)->hop_limit == 0) { |
3bd653c8 DL |
89 | IP6_INC_STATS(dev_net(dev), idev, |
90 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
91 | kfree_skb(skb); |
92 | return 0; | |
93 | } | |
94 | } | |
95 | ||
edf391ff NH |
96 | IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST, |
97 | skb->len); | |
dd408515 HFS |
98 | |
99 | if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <= | |
100 | IPV6_ADDR_SCOPE_NODELOCAL && | |
101 | !(dev->flags & IFF_LOOPBACK)) { | |
102 | kfree_skb(skb); | |
103 | return 0; | |
104 | } | |
1da177e4 LT |
105 | } |
106 | ||
6fd6ce20 | 107 | rcu_read_lock_bh(); |
550bab42 | 108 | nexthop = rt6_nexthop((struct rt6_info *)dst); |
6fd6ce20 YH |
109 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); |
110 | if (unlikely(!neigh)) | |
111 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
112 | if (!IS_ERR(neigh)) { | |
113 | ret = dst_neigh_output(dst, neigh, skb); | |
114 | rcu_read_unlock_bh(); | |
115 | return ret; | |
116 | } | |
117 | rcu_read_unlock_bh(); | |
05e3aa09 | 118 | |
7f88c6b2 HFS |
119 | IP6_INC_STATS(dev_net(dst->dev), |
120 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
9e508490 JE |
121 | kfree_skb(skb); |
122 | return -EINVAL; | |
1da177e4 LT |
123 | } |
124 | ||
9e508490 JE |
125 | static int ip6_finish_output(struct sk_buff *skb) |
126 | { | |
127 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || | |
9037c357 JP |
128 | dst_allfrag(skb_dst(skb)) || |
129 | (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size)) | |
9e508490 JE |
130 | return ip6_fragment(skb, ip6_finish_output2); |
131 | else | |
132 | return ip6_finish_output2(skb); | |
133 | } | |
134 | ||
aad88724 | 135 | int ip6_output(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 136 | { |
9e508490 | 137 | struct net_device *dev = skb_dst(skb)->dev; |
adf30907 | 138 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
778d80be | 139 | if (unlikely(idev->cnf.disable_ipv6)) { |
9e508490 | 140 | IP6_INC_STATS(dev_net(dev), idev, |
3bd653c8 | 141 | IPSTATS_MIB_OUTDISCARDS); |
778d80be YH |
142 | kfree_skb(skb); |
143 | return 0; | |
144 | } | |
145 | ||
9c6eb28a JE |
146 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev, |
147 | ip6_finish_output, | |
148 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1da177e4 LT |
149 | } |
150 | ||
1da177e4 | 151 | /* |
b5d43998 | 152 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
1da177e4 LT |
153 | */ |
154 | ||
4c9483b2 | 155 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
b903d324 | 156 | struct ipv6_txoptions *opt, int tclass) |
1da177e4 | 157 | { |
3bd653c8 | 158 | struct net *net = sock_net(sk); |
b30bd282 | 159 | struct ipv6_pinfo *np = inet6_sk(sk); |
4c9483b2 | 160 | struct in6_addr *first_hop = &fl6->daddr; |
adf30907 | 161 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 162 | struct ipv6hdr *hdr; |
4c9483b2 | 163 | u8 proto = fl6->flowi6_proto; |
1da177e4 | 164 | int seg_len = skb->len; |
e651f03a | 165 | int hlimit = -1; |
1da177e4 LT |
166 | u32 mtu; |
167 | ||
168 | if (opt) { | |
c2636b4d | 169 | unsigned int head_room; |
1da177e4 LT |
170 | |
171 | /* First: exthdrs may take lots of space (~8K for now) | |
172 | MAX_HEADER is not enough. | |
173 | */ | |
174 | head_room = opt->opt_nflen + opt->opt_flen; | |
175 | seg_len += head_room; | |
176 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
177 | ||
178 | if (skb_headroom(skb) < head_room) { | |
179 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
a11d206d | 180 | if (skb2 == NULL) { |
adf30907 | 181 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
182 | IPSTATS_MIB_OUTDISCARDS); |
183 | kfree_skb(skb); | |
1da177e4 LT |
184 | return -ENOBUFS; |
185 | } | |
808db80a | 186 | consume_skb(skb); |
a11d206d | 187 | skb = skb2; |
83d7eb29 | 188 | skb_set_owner_w(skb, sk); |
1da177e4 LT |
189 | } |
190 | if (opt->opt_flen) | |
191 | ipv6_push_frag_opts(skb, opt, &proto); | |
192 | if (opt->opt_nflen) | |
193 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
194 | } | |
195 | ||
e2d1bca7 ACM |
196 | skb_push(skb, sizeof(struct ipv6hdr)); |
197 | skb_reset_network_header(skb); | |
0660e03f | 198 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
199 | |
200 | /* | |
201 | * Fill in the IPv6 header | |
202 | */ | |
b903d324 | 203 | if (np) |
1da177e4 LT |
204 | hlimit = np->hop_limit; |
205 | if (hlimit < 0) | |
6b75d090 | 206 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 207 | |
cb1ce2ef TH |
208 | ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel, |
209 | np->autoflowlabel)); | |
41a1f8ea | 210 | |
1da177e4 LT |
211 | hdr->payload_len = htons(seg_len); |
212 | hdr->nexthdr = proto; | |
213 | hdr->hop_limit = hlimit; | |
214 | ||
4e3fd7a0 AD |
215 | hdr->saddr = fl6->saddr; |
216 | hdr->daddr = *first_hop; | |
1da177e4 | 217 | |
9c9c9ad5 | 218 | skb->protocol = htons(ETH_P_IPV6); |
a2c2064f | 219 | skb->priority = sk->sk_priority; |
4a19ec58 | 220 | skb->mark = sk->sk_mark; |
a2c2064f | 221 | |
1da177e4 | 222 | mtu = dst_mtu(dst); |
60ff7467 | 223 | if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) { |
adf30907 | 224 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 225 | IPSTATS_MIB_OUT, skb->len); |
b2e0b385 JE |
226 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
227 | dst->dev, dst_output); | |
1da177e4 LT |
228 | } |
229 | ||
1da177e4 | 230 | skb->dev = dst->dev; |
f4e53e29 | 231 | ipv6_local_error(sk, EMSGSIZE, fl6, mtu); |
adf30907 | 232 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
233 | kfree_skb(skb); |
234 | return -EMSGSIZE; | |
235 | } | |
7159039a YH |
236 | EXPORT_SYMBOL(ip6_xmit); |
237 | ||
1da177e4 LT |
238 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
239 | { | |
240 | struct ip6_ra_chain *ra; | |
241 | struct sock *last = NULL; | |
242 | ||
243 | read_lock(&ip6_ra_lock); | |
244 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
245 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
246 | if (sk && ra->sel == sel && |
247 | (!sk->sk_bound_dev_if || | |
248 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
249 | if (last) { |
250 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
251 | if (skb2) | |
252 | rawv6_rcv(last, skb2); | |
253 | } | |
254 | last = sk; | |
255 | } | |
256 | } | |
257 | ||
258 | if (last) { | |
259 | rawv6_rcv(last, skb); | |
260 | read_unlock(&ip6_ra_lock); | |
261 | return 1; | |
262 | } | |
263 | read_unlock(&ip6_ra_lock); | |
264 | return 0; | |
265 | } | |
266 | ||
e21e0b5f VN |
267 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
268 | { | |
0660e03f | 269 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f | 270 | u8 nexthdr = hdr->nexthdr; |
75f2811c | 271 | __be16 frag_off; |
e21e0b5f VN |
272 | int offset; |
273 | ||
274 | if (ipv6_ext_hdr(nexthdr)) { | |
75f2811c | 275 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); |
e21e0b5f VN |
276 | if (offset < 0) |
277 | return 0; | |
278 | } else | |
279 | offset = sizeof(struct ipv6hdr); | |
280 | ||
281 | if (nexthdr == IPPROTO_ICMPV6) { | |
282 | struct icmp6hdr *icmp6; | |
283 | ||
d56f90a7 ACM |
284 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
285 | offset + 1 - skb->data))) | |
e21e0b5f VN |
286 | return 0; |
287 | ||
d56f90a7 | 288 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
289 | |
290 | switch (icmp6->icmp6_type) { | |
291 | case NDISC_ROUTER_SOLICITATION: | |
292 | case NDISC_ROUTER_ADVERTISEMENT: | |
293 | case NDISC_NEIGHBOUR_SOLICITATION: | |
294 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
295 | case NDISC_REDIRECT: | |
296 | /* For reaction involving unicast neighbor discovery | |
297 | * message destined to the proxied address, pass it to | |
298 | * input function. | |
299 | */ | |
300 | return 1; | |
301 | default: | |
302 | break; | |
303 | } | |
304 | } | |
305 | ||
74553b09 VN |
306 | /* |
307 | * The proxying router can't forward traffic sent to a link-local | |
308 | * address, so signal the sender and discard the packet. This | |
309 | * behavior is clarified by the MIPv6 specification. | |
310 | */ | |
311 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
312 | dst_link_failure(skb); | |
313 | return -1; | |
314 | } | |
315 | ||
e21e0b5f VN |
316 | return 0; |
317 | } | |
318 | ||
1da177e4 LT |
319 | static inline int ip6_forward_finish(struct sk_buff *skb) |
320 | { | |
321 | return dst_output(skb); | |
322 | } | |
323 | ||
0954cf9c HFS |
324 | static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst) |
325 | { | |
326 | unsigned int mtu; | |
327 | struct inet6_dev *idev; | |
328 | ||
329 | if (dst_metric_locked(dst, RTAX_MTU)) { | |
330 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
331 | if (mtu) | |
332 | return mtu; | |
333 | } | |
334 | ||
335 | mtu = IPV6_MIN_MTU; | |
336 | rcu_read_lock(); | |
337 | idev = __in6_dev_get(dst->dev); | |
338 | if (idev) | |
339 | mtu = idev->cnf.mtu6; | |
340 | rcu_read_unlock(); | |
341 | ||
342 | return mtu; | |
343 | } | |
344 | ||
fe6cc55f FW |
345 | static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
346 | { | |
418a3156 | 347 | if (skb->len <= mtu) |
fe6cc55f FW |
348 | return false; |
349 | ||
60ff7467 | 350 | /* ipv6 conntrack defrag sets max_frag_size + ignore_df */ |
fe6cc55f FW |
351 | if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu) |
352 | return true; | |
353 | ||
60ff7467 | 354 | if (skb->ignore_df) |
418a3156 FW |
355 | return false; |
356 | ||
fe6cc55f FW |
357 | if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu) |
358 | return false; | |
359 | ||
360 | return true; | |
361 | } | |
362 | ||
1da177e4 LT |
363 | int ip6_forward(struct sk_buff *skb) |
364 | { | |
adf30907 | 365 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 366 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 367 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 368 | struct net *net = dev_net(dst->dev); |
14f3ad6f | 369 | u32 mtu; |
1ab1457c | 370 | |
53b7997f | 371 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
372 | goto error; |
373 | ||
090f1166 LR |
374 | if (skb->pkt_type != PACKET_HOST) |
375 | goto drop; | |
376 | ||
4497b076 BH |
377 | if (skb_warn_if_lro(skb)) |
378 | goto drop; | |
379 | ||
1da177e4 | 380 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
15c77d8b ED |
381 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
382 | IPSTATS_MIB_INDISCARDS); | |
1da177e4 LT |
383 | goto drop; |
384 | } | |
385 | ||
35fc92a9 | 386 | skb_forward_csum(skb); |
1da177e4 LT |
387 | |
388 | /* | |
389 | * We DO NOT make any processing on | |
390 | * RA packets, pushing them to user level AS IS | |
391 | * without ane WARRANTY that application will be able | |
392 | * to interpret them. The reason is that we | |
393 | * cannot make anything clever here. | |
394 | * | |
395 | * We are not end-node, so that if packet contains | |
396 | * AH/ESP, we cannot make anything. | |
397 | * Defragmentation also would be mistake, RA packets | |
398 | * cannot be fragmented, because there is no warranty | |
399 | * that different fragments will go along one path. --ANK | |
400 | */ | |
ab4eb353 YH |
401 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
402 | if (ip6_call_ra_chain(skb, ntohs(opt->ra))) | |
1da177e4 LT |
403 | return 0; |
404 | } | |
405 | ||
406 | /* | |
407 | * check and decrement ttl | |
408 | */ | |
409 | if (hdr->hop_limit <= 1) { | |
410 | /* Force OUTPUT device used as source address */ | |
411 | skb->dev = dst->dev; | |
3ffe533c | 412 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
15c77d8b ED |
413 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
414 | IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
415 | |
416 | kfree_skb(skb); | |
417 | return -ETIMEDOUT; | |
418 | } | |
419 | ||
fbea49e1 | 420 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 421 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 422 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
423 | int proxied = ip6_forward_proxy_check(skb); |
424 | if (proxied > 0) | |
e21e0b5f | 425 | return ip6_input(skb); |
74553b09 | 426 | else if (proxied < 0) { |
15c77d8b ED |
427 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
428 | IPSTATS_MIB_INDISCARDS); | |
74553b09 VN |
429 | goto drop; |
430 | } | |
e21e0b5f VN |
431 | } |
432 | ||
1da177e4 | 433 | if (!xfrm6_route_forward(skb)) { |
15c77d8b ED |
434 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
435 | IPSTATS_MIB_INDISCARDS); | |
1da177e4 LT |
436 | goto drop; |
437 | } | |
adf30907 | 438 | dst = skb_dst(skb); |
1da177e4 LT |
439 | |
440 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
441 | send redirects to source routed frames. | |
1e5dc146 | 442 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 443 | */ |
c45a3dfb | 444 | if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) { |
1da177e4 | 445 | struct in6_addr *target = NULL; |
fbfe95a4 | 446 | struct inet_peer *peer; |
1da177e4 | 447 | struct rt6_info *rt; |
1da177e4 LT |
448 | |
449 | /* | |
450 | * incoming and outgoing devices are the same | |
451 | * send a redirect. | |
452 | */ | |
453 | ||
454 | rt = (struct rt6_info *) dst; | |
c45a3dfb DM |
455 | if (rt->rt6i_flags & RTF_GATEWAY) |
456 | target = &rt->rt6i_gateway; | |
1da177e4 LT |
457 | else |
458 | target = &hdr->daddr; | |
459 | ||
1d861aa4 | 460 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
92d86829 | 461 | |
1da177e4 LT |
462 | /* Limit redirects both by destination (here) |
463 | and by source (inside ndisc_send_redirect) | |
464 | */ | |
fbfe95a4 | 465 | if (inet_peer_xrlim_allow(peer, 1*HZ)) |
4991969a | 466 | ndisc_send_redirect(skb, target); |
1d861aa4 DM |
467 | if (peer) |
468 | inet_putpeer(peer); | |
5bb1ab09 DS |
469 | } else { |
470 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
471 | ||
1da177e4 | 472 | /* This check is security critical. */ |
f81b2e7d YH |
473 | if (addrtype == IPV6_ADDR_ANY || |
474 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
475 | goto error; |
476 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
477 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3ffe533c | 478 | ICMPV6_NOT_NEIGHBOUR, 0); |
5bb1ab09 DS |
479 | goto error; |
480 | } | |
1da177e4 LT |
481 | } |
482 | ||
0954cf9c | 483 | mtu = ip6_dst_mtu_forward(dst); |
14f3ad6f UW |
484 | if (mtu < IPV6_MIN_MTU) |
485 | mtu = IPV6_MIN_MTU; | |
486 | ||
fe6cc55f | 487 | if (ip6_pkt_too_big(skb, mtu)) { |
1da177e4 LT |
488 | /* Again, force OUTPUT device used as source address */ |
489 | skb->dev = dst->dev; | |
14f3ad6f | 490 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
15c77d8b ED |
491 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
492 | IPSTATS_MIB_INTOOBIGERRORS); | |
493 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), | |
494 | IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
495 | kfree_skb(skb); |
496 | return -EMSGSIZE; | |
497 | } | |
498 | ||
499 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
15c77d8b ED |
500 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
501 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
502 | goto drop; |
503 | } | |
504 | ||
0660e03f | 505 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
506 | |
507 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 508 | |
1da177e4 LT |
509 | hdr->hop_limit--; |
510 | ||
483a47d2 | 511 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
2d8dbb04 | 512 | IP6_ADD_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len); |
b2e0b385 | 513 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
6e23ae2a | 514 | ip6_forward_finish); |
1da177e4 LT |
515 | |
516 | error: | |
483a47d2 | 517 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
518 | drop: |
519 | kfree_skb(skb); | |
520 | return -EINVAL; | |
521 | } | |
522 | ||
523 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
524 | { | |
525 | to->pkt_type = from->pkt_type; | |
526 | to->priority = from->priority; | |
527 | to->protocol = from->protocol; | |
adf30907 ED |
528 | skb_dst_drop(to); |
529 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 530 | to->dev = from->dev; |
82e91ffe | 531 | to->mark = from->mark; |
1da177e4 LT |
532 | |
533 | #ifdef CONFIG_NET_SCHED | |
534 | to->tc_index = from->tc_index; | |
535 | #endif | |
e7ac05f3 | 536 | nf_copy(to, from); |
984bc16c | 537 | skb_copy_secmark(to, from); |
1da177e4 LT |
538 | } |
539 | ||
ad0081e4 | 540 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
1da177e4 | 541 | { |
1da177e4 | 542 | struct sk_buff *frag; |
67ba4152 | 543 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
d91675f9 | 544 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
545 | struct ipv6hdr *tmp_hdr; |
546 | struct frag_hdr *fh; | |
547 | unsigned int mtu, hlen, left, len; | |
a7ae1992 | 548 | int hroom, troom; |
ae08e1f0 | 549 | __be32 frag_id = 0; |
67ba4152 | 550 | int ptr, offset = 0, err = 0; |
1da177e4 | 551 | u8 *prevhdr, nexthdr = 0; |
adf30907 | 552 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 553 | |
1da177e4 LT |
554 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
555 | nexthdr = *prevhdr; | |
556 | ||
628a5c56 | 557 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
558 | |
559 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 560 | * or if the skb it not generated by a local socket. |
b881ef76 | 561 | */ |
60ff7467 | 562 | if (unlikely(!skb->ignore_df && skb->len > mtu) || |
4cdd3408 PM |
563 | (IP6CB(skb)->frag_max_size && |
564 | IP6CB(skb)->frag_max_size > mtu)) { | |
a34a101e ED |
565 | if (skb->sk && dst_allfrag(skb_dst(skb))) |
566 | sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK); | |
567 | ||
adf30907 | 568 | skb->dev = skb_dst(skb)->dev; |
3ffe533c | 569 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 570 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 571 | IPSTATS_MIB_FRAGFAILS); |
b881ef76 JH |
572 | kfree_skb(skb); |
573 | return -EMSGSIZE; | |
574 | } | |
575 | ||
d91675f9 YH |
576 | if (np && np->frag_size < mtu) { |
577 | if (np->frag_size) | |
578 | mtu = np->frag_size; | |
579 | } | |
580 | mtu -= hlen + sizeof(struct frag_hdr); | |
1da177e4 | 581 | |
21dc3301 | 582 | if (skb_has_frag_list(skb)) { |
1da177e4 | 583 | int first_len = skb_pagelen(skb); |
3d13008e | 584 | struct sk_buff *frag2; |
1da177e4 LT |
585 | |
586 | if (first_len - hlen > mtu || | |
587 | ((first_len - hlen) & 7) || | |
588 | skb_cloned(skb)) | |
589 | goto slow_path; | |
590 | ||
4d9092bb | 591 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
592 | /* Correct geometry. */ |
593 | if (frag->len > mtu || | |
594 | ((frag->len & 7) && frag->next) || | |
595 | skb_headroom(frag) < hlen) | |
3d13008e | 596 | goto slow_path_clean; |
1da177e4 | 597 | |
1da177e4 LT |
598 | /* Partially cloned skb? */ |
599 | if (skb_shared(frag)) | |
3d13008e | 600 | goto slow_path_clean; |
2fdba6b0 HX |
601 | |
602 | BUG_ON(frag->sk); | |
603 | if (skb->sk) { | |
2fdba6b0 HX |
604 | frag->sk = skb->sk; |
605 | frag->destructor = sock_wfree; | |
2fdba6b0 | 606 | } |
3d13008e | 607 | skb->truesize -= frag->truesize; |
1da177e4 LT |
608 | } |
609 | ||
610 | err = 0; | |
611 | offset = 0; | |
612 | frag = skb_shinfo(skb)->frag_list; | |
4d9092bb | 613 | skb_frag_list_init(skb); |
1da177e4 LT |
614 | /* BUILD HEADER */ |
615 | ||
9a217a1c | 616 | *prevhdr = NEXTHDR_FRAGMENT; |
d56f90a7 | 617 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
1da177e4 | 618 | if (!tmp_hdr) { |
adf30907 | 619 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 620 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
621 | return -ENOMEM; |
622 | } | |
623 | ||
1da177e4 | 624 | __skb_pull(skb, hlen); |
67ba4152 | 625 | fh = (struct frag_hdr *)__skb_push(skb, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
626 | __skb_push(skb, hlen); |
627 | skb_reset_network_header(skb); | |
d56f90a7 | 628 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
1da177e4 | 629 | |
87c48fa3 | 630 | ipv6_select_ident(fh, rt); |
1da177e4 LT |
631 | fh->nexthdr = nexthdr; |
632 | fh->reserved = 0; | |
633 | fh->frag_off = htons(IP6_MF); | |
634 | frag_id = fh->identification; | |
635 | ||
636 | first_len = skb_pagelen(skb); | |
637 | skb->data_len = first_len - skb_headlen(skb); | |
638 | skb->len = first_len; | |
0660e03f ACM |
639 | ipv6_hdr(skb)->payload_len = htons(first_len - |
640 | sizeof(struct ipv6hdr)); | |
a11d206d | 641 | |
d8d1f30b | 642 | dst_hold(&rt->dst); |
1da177e4 LT |
643 | |
644 | for (;;) { | |
645 | /* Prepare header of the next frame, | |
646 | * before previous one went down. */ | |
647 | if (frag) { | |
648 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 649 | skb_reset_transport_header(frag); |
67ba4152 | 650 | fh = (struct frag_hdr *)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
651 | __skb_push(frag, hlen); |
652 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
653 | memcpy(skb_network_header(frag), tmp_hdr, |
654 | hlen); | |
1da177e4 LT |
655 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
656 | fh->nexthdr = nexthdr; | |
657 | fh->reserved = 0; | |
658 | fh->frag_off = htons(offset); | |
659 | if (frag->next != NULL) | |
660 | fh->frag_off |= htons(IP6_MF); | |
661 | fh->identification = frag_id; | |
0660e03f ACM |
662 | ipv6_hdr(frag)->payload_len = |
663 | htons(frag->len - | |
664 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
665 | ip6_copy_metadata(frag, skb); |
666 | } | |
1ab1457c | 667 | |
1da177e4 | 668 | err = output(skb); |
67ba4152 | 669 | if (!err) |
d8d1f30b | 670 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 671 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 672 | |
1da177e4 LT |
673 | if (err || !frag) |
674 | break; | |
675 | ||
676 | skb = frag; | |
677 | frag = skb->next; | |
678 | skb->next = NULL; | |
679 | } | |
680 | ||
a51482bd | 681 | kfree(tmp_hdr); |
1da177e4 LT |
682 | |
683 | if (err == 0) { | |
d8d1f30b | 684 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 685 | IPSTATS_MIB_FRAGOKS); |
94e187c0 | 686 | ip6_rt_put(rt); |
1da177e4 LT |
687 | return 0; |
688 | } | |
689 | ||
46cfd725 | 690 | kfree_skb_list(frag); |
1da177e4 | 691 | |
d8d1f30b | 692 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 693 | IPSTATS_MIB_FRAGFAILS); |
94e187c0 | 694 | ip6_rt_put(rt); |
1da177e4 | 695 | return err; |
3d13008e ED |
696 | |
697 | slow_path_clean: | |
698 | skb_walk_frags(skb, frag2) { | |
699 | if (frag2 == frag) | |
700 | break; | |
701 | frag2->sk = NULL; | |
702 | frag2->destructor = NULL; | |
703 | skb->truesize += frag2->truesize; | |
704 | } | |
1da177e4 LT |
705 | } |
706 | ||
707 | slow_path: | |
72e843bb ED |
708 | if ((skb->ip_summed == CHECKSUM_PARTIAL) && |
709 | skb_checksum_help(skb)) | |
710 | goto fail; | |
711 | ||
1da177e4 LT |
712 | left = skb->len - hlen; /* Space per frame */ |
713 | ptr = hlen; /* Where to start from */ | |
714 | ||
715 | /* | |
716 | * Fragment the datagram. | |
717 | */ | |
718 | ||
719 | *prevhdr = NEXTHDR_FRAGMENT; | |
a7ae1992 HX |
720 | hroom = LL_RESERVED_SPACE(rt->dst.dev); |
721 | troom = rt->dst.dev->needed_tailroom; | |
1da177e4 LT |
722 | |
723 | /* | |
724 | * Keep copying data until we run out. | |
725 | */ | |
67ba4152 | 726 | while (left > 0) { |
1da177e4 LT |
727 | len = left; |
728 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
729 | if (len > mtu) | |
730 | len = mtu; | |
25985edc | 731 | /* IF: we are not sending up to and including the packet end |
1da177e4 LT |
732 | then align the next start on an eight byte boundary */ |
733 | if (len < left) { | |
734 | len &= ~7; | |
735 | } | |
1da177e4 | 736 | |
cbffccc9 JP |
737 | /* Allocate buffer */ |
738 | frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) + | |
739 | hroom + troom, GFP_ATOMIC); | |
740 | if (!frag) { | |
adf30907 | 741 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 742 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
743 | err = -ENOMEM; |
744 | goto fail; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Set up data on packet | |
749 | */ | |
750 | ||
751 | ip6_copy_metadata(frag, skb); | |
a7ae1992 | 752 | skb_reserve(frag, hroom); |
1da177e4 | 753 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
c1d2bbe1 | 754 | skb_reset_network_header(frag); |
badff6d0 | 755 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
b0e380b1 ACM |
756 | frag->transport_header = (frag->network_header + hlen + |
757 | sizeof(struct frag_hdr)); | |
1da177e4 LT |
758 | |
759 | /* | |
760 | * Charge the memory for the fragment to any owner | |
761 | * it might possess | |
762 | */ | |
763 | if (skb->sk) | |
764 | skb_set_owner_w(frag, skb->sk); | |
765 | ||
766 | /* | |
767 | * Copy the packet header into the new buffer. | |
768 | */ | |
d626f62b | 769 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
1da177e4 LT |
770 | |
771 | /* | |
772 | * Build fragment header. | |
773 | */ | |
774 | fh->nexthdr = nexthdr; | |
775 | fh->reserved = 0; | |
f36d6ab1 | 776 | if (!frag_id) { |
87c48fa3 | 777 | ipv6_select_ident(fh, rt); |
1da177e4 LT |
778 | frag_id = fh->identification; |
779 | } else | |
780 | fh->identification = frag_id; | |
781 | ||
782 | /* | |
783 | * Copy a block of the IP datagram. | |
784 | */ | |
e3f0b86b HS |
785 | BUG_ON(skb_copy_bits(skb, ptr, skb_transport_header(frag), |
786 | len)); | |
1da177e4 LT |
787 | left -= len; |
788 | ||
789 | fh->frag_off = htons(offset); | |
790 | if (left > 0) | |
791 | fh->frag_off |= htons(IP6_MF); | |
0660e03f ACM |
792 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
793 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
794 | |
795 | ptr += len; | |
796 | offset += len; | |
797 | ||
798 | /* | |
799 | * Put this fragment into the sending queue. | |
800 | */ | |
1da177e4 LT |
801 | err = output(frag); |
802 | if (err) | |
803 | goto fail; | |
dafee490 | 804 | |
adf30907 | 805 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 806 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 807 | } |
adf30907 | 808 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 809 | IPSTATS_MIB_FRAGOKS); |
808db80a | 810 | consume_skb(skb); |
1da177e4 LT |
811 | return err; |
812 | ||
813 | fail: | |
adf30907 | 814 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 815 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 816 | kfree_skb(skb); |
1da177e4 LT |
817 | return err; |
818 | } | |
819 | ||
b71d1d42 ED |
820 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
821 | const struct in6_addr *fl_addr, | |
822 | const struct in6_addr *addr_cache) | |
cf6b1982 | 823 | { |
a02cec21 ED |
824 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
825 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)); | |
cf6b1982 YH |
826 | } |
827 | ||
497c615a HX |
828 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
829 | struct dst_entry *dst, | |
b71d1d42 | 830 | const struct flowi6 *fl6) |
1da177e4 | 831 | { |
497c615a | 832 | struct ipv6_pinfo *np = inet6_sk(sk); |
a963a37d | 833 | struct rt6_info *rt; |
1da177e4 | 834 | |
497c615a HX |
835 | if (!dst) |
836 | goto out; | |
837 | ||
a963a37d ED |
838 | if (dst->ops->family != AF_INET6) { |
839 | dst_release(dst); | |
840 | return NULL; | |
841 | } | |
842 | ||
843 | rt = (struct rt6_info *)dst; | |
497c615a HX |
844 | /* Yes, checking route validity in not connected |
845 | * case is not very simple. Take into account, | |
846 | * that we do not support routing by source, TOS, | |
67ba4152 | 847 | * and MSG_DONTROUTE --ANK (980726) |
497c615a | 848 | * |
cf6b1982 YH |
849 | * 1. ip6_rt_check(): If route was host route, |
850 | * check that cached destination is current. | |
497c615a HX |
851 | * If it is network route, we still may |
852 | * check its validity using saved pointer | |
853 | * to the last used address: daddr_cache. | |
854 | * We do not want to save whole address now, | |
855 | * (because main consumer of this service | |
856 | * is tcp, which has not this problem), | |
857 | * so that the last trick works only on connected | |
858 | * sockets. | |
859 | * 2. oif also should be the same. | |
860 | */ | |
4c9483b2 | 861 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
8e1ef0a9 | 862 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 863 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
8e1ef0a9 | 864 | #endif |
4c9483b2 | 865 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) { |
497c615a HX |
866 | dst_release(dst); |
867 | dst = NULL; | |
1da177e4 LT |
868 | } |
869 | ||
497c615a HX |
870 | out: |
871 | return dst; | |
872 | } | |
873 | ||
874 | static int ip6_dst_lookup_tail(struct sock *sk, | |
4c9483b2 | 875 | struct dst_entry **dst, struct flowi6 *fl6) |
497c615a | 876 | { |
3b1e0a65 | 877 | struct net *net = sock_net(sk); |
69cce1d1 DM |
878 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
879 | struct neighbour *n; | |
97cac082 | 880 | struct rt6_info *rt; |
69cce1d1 DM |
881 | #endif |
882 | int err; | |
497c615a | 883 | |
1da177e4 | 884 | if (*dst == NULL) |
4c9483b2 | 885 | *dst = ip6_route_output(net, sk, fl6); |
1da177e4 | 886 | |
e5d08d71 IM |
887 | err = (*dst)->error; |
888 | if (err) | |
1da177e4 LT |
889 | goto out_err_release; |
890 | ||
4c9483b2 | 891 | if (ipv6_addr_any(&fl6->saddr)) { |
c3968a85 DW |
892 | struct rt6_info *rt = (struct rt6_info *) *dst; |
893 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
894 | sk ? inet6_sk(sk)->srcprefs : 0, | |
895 | &fl6->saddr); | |
44456d37 | 896 | if (err) |
1da177e4 | 897 | goto out_err_release; |
1da177e4 LT |
898 | } |
899 | ||
95c385b4 | 900 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
901 | /* |
902 | * Here if the dst entry we've looked up | |
903 | * has a neighbour entry that is in the INCOMPLETE | |
904 | * state and the src address from the flow is | |
905 | * marked as OPTIMISTIC, we release the found | |
906 | * dst entry and replace it instead with the | |
907 | * dst entry of the nexthop router | |
908 | */ | |
c56bf6fe | 909 | rt = (struct rt6_info *) *dst; |
707be1ff | 910 | rcu_read_lock_bh(); |
550bab42 | 911 | n = __ipv6_neigh_lookup_noref(rt->dst.dev, rt6_nexthop(rt)); |
707be1ff YH |
912 | err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0; |
913 | rcu_read_unlock_bh(); | |
914 | ||
915 | if (err) { | |
e550dfb0 | 916 | struct inet6_ifaddr *ifp; |
4c9483b2 | 917 | struct flowi6 fl_gw6; |
e550dfb0 NH |
918 | int redirect; |
919 | ||
4c9483b2 | 920 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
e550dfb0 NH |
921 | (*dst)->dev, 1); |
922 | ||
923 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
924 | if (ifp) | |
925 | in6_ifa_put(ifp); | |
926 | ||
927 | if (redirect) { | |
928 | /* | |
929 | * We need to get the dst entry for the | |
930 | * default router instead | |
931 | */ | |
932 | dst_release(*dst); | |
4c9483b2 DM |
933 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
934 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
935 | *dst = ip6_route_output(net, sk, &fl_gw6); | |
e5d08d71 IM |
936 | err = (*dst)->error; |
937 | if (err) | |
e550dfb0 | 938 | goto out_err_release; |
95c385b4 | 939 | } |
e550dfb0 | 940 | } |
95c385b4 NH |
941 | #endif |
942 | ||
1da177e4 LT |
943 | return 0; |
944 | ||
945 | out_err_release: | |
ca46f9c8 | 946 | if (err == -ENETUNREACH) |
5ac68e7c | 947 | IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
948 | dst_release(*dst); |
949 | *dst = NULL; | |
950 | return err; | |
951 | } | |
34a0b3cd | 952 | |
497c615a HX |
953 | /** |
954 | * ip6_dst_lookup - perform route lookup on flow | |
955 | * @sk: socket which provides route info | |
956 | * @dst: pointer to dst_entry * for result | |
4c9483b2 | 957 | * @fl6: flow to lookup |
497c615a HX |
958 | * |
959 | * This function performs a route lookup on the given flow. | |
960 | * | |
961 | * It returns zero on success, or a standard errno code on error. | |
962 | */ | |
4c9483b2 | 963 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6) |
497c615a HX |
964 | { |
965 | *dst = NULL; | |
4c9483b2 | 966 | return ip6_dst_lookup_tail(sk, dst, fl6); |
497c615a | 967 | } |
3cf3dc6c ACM |
968 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
969 | ||
497c615a | 970 | /** |
68d0c6d3 DM |
971 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
972 | * @sk: socket which provides route info | |
4c9483b2 | 973 | * @fl6: flow to lookup |
68d0c6d3 | 974 | * @final_dst: final destination address for ipsec lookup |
68d0c6d3 DM |
975 | * |
976 | * This function performs a route lookup on the given flow. | |
977 | * | |
978 | * It returns a valid dst pointer on success, or a pointer encoded | |
979 | * error code. | |
980 | */ | |
4c9483b2 | 981 | struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 982 | const struct in6_addr *final_dst) |
68d0c6d3 DM |
983 | { |
984 | struct dst_entry *dst = NULL; | |
985 | int err; | |
986 | ||
4c9483b2 | 987 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
988 | if (err) |
989 | return ERR_PTR(err); | |
990 | if (final_dst) | |
4e3fd7a0 | 991 | fl6->daddr = *final_dst; |
2774c131 | 992 | |
f92ee619 | 993 | return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
68d0c6d3 DM |
994 | } |
995 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
996 | ||
997 | /** | |
998 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
497c615a | 999 | * @sk: socket which provides the dst cache and route info |
4c9483b2 | 1000 | * @fl6: flow to lookup |
68d0c6d3 | 1001 | * @final_dst: final destination address for ipsec lookup |
497c615a HX |
1002 | * |
1003 | * This function performs a route lookup on the given flow with the | |
1004 | * possibility of using the cached route in the socket if it is valid. | |
1005 | * It will take the socket dst lock when operating on the dst cache. | |
1006 | * As a result, this function can only be used in process context. | |
1007 | * | |
68d0c6d3 DM |
1008 | * It returns a valid dst pointer on success, or a pointer encoded |
1009 | * error code. | |
497c615a | 1010 | */ |
4c9483b2 | 1011 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 1012 | const struct in6_addr *final_dst) |
497c615a | 1013 | { |
68d0c6d3 DM |
1014 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
1015 | int err; | |
497c615a | 1016 | |
4c9483b2 | 1017 | dst = ip6_sk_dst_check(sk, dst, fl6); |
68d0c6d3 | 1018 | |
4c9483b2 | 1019 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1020 | if (err) |
1021 | return ERR_PTR(err); | |
1022 | if (final_dst) | |
4e3fd7a0 | 1023 | fl6->daddr = *final_dst; |
2774c131 | 1024 | |
f92ee619 | 1025 | return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
497c615a | 1026 | } |
68d0c6d3 | 1027 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
497c615a | 1028 | |
34a0b3cd | 1029 | static inline int ip6_ufo_append_data(struct sock *sk, |
0bbe84a6 | 1030 | struct sk_buff_head *queue, |
e89e9cf5 AR |
1031 | int getfrag(void *from, char *to, int offset, int len, |
1032 | int odd, struct sk_buff *skb), | |
1033 | void *from, int length, int hh_len, int fragheaderlen, | |
67ba4152 | 1034 | int transhdrlen, int mtu, unsigned int flags, |
87c48fa3 | 1035 | struct rt6_info *rt) |
e89e9cf5 AR |
1036 | |
1037 | { | |
1038 | struct sk_buff *skb; | |
c547dbf5 | 1039 | struct frag_hdr fhdr; |
e89e9cf5 AR |
1040 | int err; |
1041 | ||
1042 | /* There is support for UDP large send offload by network | |
1043 | * device, so create one single skb packet containing complete | |
1044 | * udp datagram | |
1045 | */ | |
0bbe84a6 | 1046 | skb = skb_peek_tail(queue); |
e5d08d71 | 1047 | if (skb == NULL) { |
e89e9cf5 AR |
1048 | skb = sock_alloc_send_skb(sk, |
1049 | hh_len + fragheaderlen + transhdrlen + 20, | |
1050 | (flags & MSG_DONTWAIT), &err); | |
1051 | if (skb == NULL) | |
504744e4 | 1052 | return err; |
e89e9cf5 AR |
1053 | |
1054 | /* reserve space for Hardware header */ | |
1055 | skb_reserve(skb, hh_len); | |
1056 | ||
1057 | /* create space for UDP/IP header */ | |
67ba4152 | 1058 | skb_put(skb, fragheaderlen + transhdrlen); |
e89e9cf5 AR |
1059 | |
1060 | /* initialize network header pointer */ | |
c1d2bbe1 | 1061 | skb_reset_network_header(skb); |
e89e9cf5 AR |
1062 | |
1063 | /* initialize protocol header pointer */ | |
b0e380b1 | 1064 | skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf5 | 1065 | |
9c9c9ad5 | 1066 | skb->protocol = htons(ETH_P_IPV6); |
e89e9cf5 | 1067 | skb->csum = 0; |
e89e9cf5 | 1068 | |
0bbe84a6 | 1069 | __skb_queue_tail(queue, skb); |
c547dbf5 JP |
1070 | } else if (skb_is_gso(skb)) { |
1071 | goto append; | |
e89e9cf5 | 1072 | } |
e89e9cf5 | 1073 | |
c547dbf5 JP |
1074 | skb->ip_summed = CHECKSUM_PARTIAL; |
1075 | /* Specify the length of each IPv6 datagram fragment. | |
1076 | * It has to be a multiple of 8. | |
1077 | */ | |
1078 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - | |
1079 | sizeof(struct frag_hdr)) & ~7; | |
1080 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
1081 | ipv6_select_ident(&fhdr, rt); | |
1082 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; | |
1083 | ||
1084 | append: | |
2811ebac HFS |
1085 | return skb_append_datato_frags(sk, skb, getfrag, from, |
1086 | (length - transhdrlen)); | |
e89e9cf5 | 1087 | } |
1da177e4 | 1088 | |
0178b695 HX |
1089 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1090 | gfp_t gfp) | |
1091 | { | |
1092 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1093 | } | |
1094 | ||
1095 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1096 | gfp_t gfp) | |
1097 | { | |
1098 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1099 | } | |
1100 | ||
75a493e6 | 1101 | static void ip6_append_data_mtu(unsigned int *mtu, |
0c183379 G |
1102 | int *maxfraglen, |
1103 | unsigned int fragheaderlen, | |
1104 | struct sk_buff *skb, | |
75a493e6 | 1105 | struct rt6_info *rt, |
e367c2d0 | 1106 | unsigned int orig_mtu) |
0c183379 G |
1107 | { |
1108 | if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { | |
1109 | if (skb == NULL) { | |
1110 | /* first fragment, reserve header_len */ | |
e367c2d0 | 1111 | *mtu = orig_mtu - rt->dst.header_len; |
0c183379 G |
1112 | |
1113 | } else { | |
1114 | /* | |
1115 | * this fragment is not first, the headers | |
1116 | * space is regarded as data space. | |
1117 | */ | |
e367c2d0 | 1118 | *mtu = orig_mtu; |
0c183379 G |
1119 | } |
1120 | *maxfraglen = ((*mtu - fragheaderlen) & ~7) | |
1121 | + fragheaderlen - sizeof(struct frag_hdr); | |
1122 | } | |
1123 | } | |
1124 | ||
366e41d9 VY |
1125 | static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork, |
1126 | struct inet6_cork *v6_cork, | |
1127 | int hlimit, int tclass, struct ipv6_txoptions *opt, | |
1128 | struct rt6_info *rt, struct flowi6 *fl6) | |
1129 | { | |
1130 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1131 | unsigned int mtu; | |
1132 | ||
1133 | /* | |
1134 | * setup for corking | |
1135 | */ | |
1136 | if (opt) { | |
1137 | if (WARN_ON(v6_cork->opt)) | |
1138 | return -EINVAL; | |
1139 | ||
1140 | v6_cork->opt = kzalloc(opt->tot_len, sk->sk_allocation); | |
1141 | if (unlikely(v6_cork->opt == NULL)) | |
1142 | return -ENOBUFS; | |
1143 | ||
1144 | v6_cork->opt->tot_len = opt->tot_len; | |
1145 | v6_cork->opt->opt_flen = opt->opt_flen; | |
1146 | v6_cork->opt->opt_nflen = opt->opt_nflen; | |
1147 | ||
1148 | v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
1149 | sk->sk_allocation); | |
1150 | if (opt->dst0opt && !v6_cork->opt->dst0opt) | |
1151 | return -ENOBUFS; | |
1152 | ||
1153 | v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
1154 | sk->sk_allocation); | |
1155 | if (opt->dst1opt && !v6_cork->opt->dst1opt) | |
1156 | return -ENOBUFS; | |
1157 | ||
1158 | v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt, | |
1159 | sk->sk_allocation); | |
1160 | if (opt->hopopt && !v6_cork->opt->hopopt) | |
1161 | return -ENOBUFS; | |
1162 | ||
1163 | v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
1164 | sk->sk_allocation); | |
1165 | if (opt->srcrt && !v6_cork->opt->srcrt) | |
1166 | return -ENOBUFS; | |
1167 | ||
1168 | /* need source address above miyazawa*/ | |
1169 | } | |
1170 | dst_hold(&rt->dst); | |
1171 | cork->base.dst = &rt->dst; | |
1172 | cork->fl.u.ip6 = *fl6; | |
1173 | v6_cork->hop_limit = hlimit; | |
1174 | v6_cork->tclass = tclass; | |
1175 | if (rt->dst.flags & DST_XFRM_TUNNEL) | |
1176 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? | |
1177 | rt->dst.dev->mtu : dst_mtu(&rt->dst); | |
1178 | else | |
1179 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? | |
1180 | rt->dst.dev->mtu : dst_mtu(rt->dst.path); | |
1181 | if (np->frag_size < mtu) { | |
1182 | if (np->frag_size) | |
1183 | mtu = np->frag_size; | |
1184 | } | |
1185 | cork->base.fragsize = mtu; | |
1186 | if (dst_allfrag(rt->dst.path)) | |
1187 | cork->base.flags |= IPCORK_ALLFRAG; | |
1188 | cork->base.length = 0; | |
1189 | ||
1190 | return 0; | |
1191 | } | |
1192 | ||
0bbe84a6 VY |
1193 | static int __ip6_append_data(struct sock *sk, |
1194 | struct flowi6 *fl6, | |
1195 | struct sk_buff_head *queue, | |
1196 | struct inet_cork *cork, | |
1197 | struct inet6_cork *v6_cork, | |
1198 | struct page_frag *pfrag, | |
1199 | int getfrag(void *from, char *to, int offset, | |
1200 | int len, int odd, struct sk_buff *skb), | |
1201 | void *from, int length, int transhdrlen, | |
1202 | unsigned int flags, int dontfrag) | |
1da177e4 | 1203 | { |
0c183379 | 1204 | struct sk_buff *skb, *skb_prev = NULL; |
e367c2d0 | 1205 | unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu; |
0bbe84a6 VY |
1206 | int exthdrlen = 0; |
1207 | int dst_exthdrlen = 0; | |
1da177e4 | 1208 | int hh_len; |
1da177e4 LT |
1209 | int copy; |
1210 | int err; | |
1211 | int offset = 0; | |
a693e698 | 1212 | __u8 tx_flags = 0; |
09c2d251 | 1213 | u32 tskey = 0; |
0bbe84a6 VY |
1214 | struct rt6_info *rt = (struct rt6_info *)cork->dst; |
1215 | struct ipv6_txoptions *opt = v6_cork->opt; | |
32dce968 | 1216 | int csummode = CHECKSUM_NONE; |
1da177e4 | 1217 | |
0bbe84a6 VY |
1218 | skb = skb_peek_tail(queue); |
1219 | if (!skb) { | |
1220 | exthdrlen = opt ? opt->opt_flen : 0; | |
7efdba5b | 1221 | dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; |
1da177e4 | 1222 | } |
0bbe84a6 | 1223 | |
366e41d9 | 1224 | mtu = cork->fragsize; |
e367c2d0 | 1225 | orig_mtu = mtu; |
1da177e4 | 1226 | |
d8d1f30b | 1227 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4 | 1228 | |
a1b05140 | 1229 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1230 | (opt ? opt->opt_nflen : 0); |
4df98e76 HFS |
1231 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - |
1232 | sizeof(struct frag_hdr); | |
1da177e4 LT |
1233 | |
1234 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
4df98e76 HFS |
1235 | unsigned int maxnonfragsize, headersize; |
1236 | ||
1237 | headersize = sizeof(struct ipv6hdr) + | |
3a1cebe7 | 1238 | (opt ? opt->opt_flen + opt->opt_nflen : 0) + |
4df98e76 HFS |
1239 | (dst_allfrag(&rt->dst) ? |
1240 | sizeof(struct frag_hdr) : 0) + | |
1241 | rt->rt6i_nfheader_len; | |
1242 | ||
60ff7467 | 1243 | if (ip6_sk_ignore_df(sk)) |
0b95227a HFS |
1244 | maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN; |
1245 | else | |
1246 | maxnonfragsize = mtu; | |
4df98e76 HFS |
1247 | |
1248 | /* dontfrag active */ | |
1249 | if ((cork->length + length > mtu - headersize) && dontfrag && | |
1250 | (sk->sk_protocol == IPPROTO_UDP || | |
1251 | sk->sk_protocol == IPPROTO_RAW)) { | |
1252 | ipv6_local_rxpmtu(sk, fl6, mtu - headersize + | |
1253 | sizeof(struct ipv6hdr)); | |
1254 | goto emsgsize; | |
1255 | } | |
1256 | ||
1257 | if (cork->length + length > maxnonfragsize - headersize) { | |
1258 | emsgsize: | |
1259 | ipv6_local_error(sk, EMSGSIZE, fl6, | |
1260 | mtu - headersize + | |
1261 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
1262 | return -EMSGSIZE; |
1263 | } | |
1264 | } | |
1265 | ||
09c2d251 | 1266 | if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_RAW) { |
bf84a010 | 1267 | sock_tx_timestamp(sk, &tx_flags); |
09c2d251 WB |
1268 | if (tx_flags & SKBTX_ANY_SW_TSTAMP && |
1269 | sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) | |
1270 | tskey = sk->sk_tskey++; | |
1271 | } | |
a693e698 | 1272 | |
32dce968 VY |
1273 | /* If this is the first and only packet and device |
1274 | * supports checksum offloading, let's use it. | |
1275 | */ | |
bf250a1f | 1276 | if (!skb && sk->sk_protocol == IPPROTO_UDP && |
32dce968 VY |
1277 | length + fragheaderlen < mtu && |
1278 | rt->dst.dev->features & NETIF_F_V6_CSUM && | |
1279 | !exthdrlen) | |
1280 | csummode = CHECKSUM_PARTIAL; | |
1da177e4 LT |
1281 | /* |
1282 | * Let's try using as much space as possible. | |
1283 | * Use MTU if total length of the message fits into the MTU. | |
1284 | * Otherwise, we need to reserve fragment header and | |
1285 | * fragment alignment (= 8-15 octects, in total). | |
1286 | * | |
1287 | * Note that we may need to "move" the data from the tail of | |
1ab1457c | 1288 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1289 | * the message. |
1290 | * | |
1ab1457c | 1291 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1292 | * at once if non-fragmentable extension headers |
1293 | * are too large. | |
1ab1457c | 1294 | * --yoshfuji |
1da177e4 LT |
1295 | */ |
1296 | ||
2811ebac HFS |
1297 | cork->length += length; |
1298 | if (((length > mtu) || | |
1299 | (skb && skb_is_gso(skb))) && | |
1300 | (sk->sk_protocol == IPPROTO_UDP) && | |
1301 | (rt->dst.dev->features & NETIF_F_UFO)) { | |
0bbe84a6 | 1302 | err = ip6_ufo_append_data(sk, queue, getfrag, from, length, |
2811ebac HFS |
1303 | hh_len, fragheaderlen, |
1304 | transhdrlen, mtu, flags, rt); | |
1305 | if (err) | |
1306 | goto error; | |
1307 | return 0; | |
e89e9cf5 | 1308 | } |
1da177e4 | 1309 | |
2811ebac | 1310 | if (!skb) |
1da177e4 LT |
1311 | goto alloc_new_skb; |
1312 | ||
1313 | while (length > 0) { | |
1314 | /* Check if the remaining data fits into current packet. */ | |
bdc712b4 | 1315 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
1da177e4 LT |
1316 | if (copy < length) |
1317 | copy = maxfraglen - skb->len; | |
1318 | ||
1319 | if (copy <= 0) { | |
1320 | char *data; | |
1321 | unsigned int datalen; | |
1322 | unsigned int fraglen; | |
1323 | unsigned int fraggap; | |
1324 | unsigned int alloclen; | |
1da177e4 | 1325 | alloc_new_skb: |
1da177e4 | 1326 | /* There's no room in the current skb */ |
0c183379 G |
1327 | if (skb) |
1328 | fraggap = skb->len - maxfraglen; | |
1da177e4 LT |
1329 | else |
1330 | fraggap = 0; | |
0c183379 G |
1331 | /* update mtu and maxfraglen if necessary */ |
1332 | if (skb == NULL || skb_prev == NULL) | |
1333 | ip6_append_data_mtu(&mtu, &maxfraglen, | |
75a493e6 | 1334 | fragheaderlen, skb, rt, |
e367c2d0 | 1335 | orig_mtu); |
0c183379 G |
1336 | |
1337 | skb_prev = skb; | |
1da177e4 LT |
1338 | |
1339 | /* | |
1340 | * If remaining data exceeds the mtu, | |
1341 | * we know we need more fragment(s). | |
1342 | */ | |
1343 | datalen = length + fraggap; | |
1da177e4 | 1344 | |
0c183379 G |
1345 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
1346 | datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; | |
1da177e4 | 1347 | if ((flags & MSG_MORE) && |
d8d1f30b | 1348 | !(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4 LT |
1349 | alloclen = mtu; |
1350 | else | |
1351 | alloclen = datalen + fragheaderlen; | |
1352 | ||
299b0767 SK |
1353 | alloclen += dst_exthdrlen; |
1354 | ||
0c183379 G |
1355 | if (datalen != length + fraggap) { |
1356 | /* | |
1357 | * this is not the last fragment, the trailer | |
1358 | * space is regarded as data space. | |
1359 | */ | |
1360 | datalen += rt->dst.trailer_len; | |
1361 | } | |
1362 | ||
1363 | alloclen += rt->dst.trailer_len; | |
1364 | fraglen = datalen + fragheaderlen; | |
1da177e4 LT |
1365 | |
1366 | /* | |
1367 | * We just reserve space for fragment header. | |
1ab1457c | 1368 | * Note: this may be overallocation if the message |
1da177e4 LT |
1369 | * (without MSG_MORE) fits into the MTU. |
1370 | */ | |
1371 | alloclen += sizeof(struct frag_hdr); | |
1372 | ||
1373 | if (transhdrlen) { | |
1374 | skb = sock_alloc_send_skb(sk, | |
1375 | alloclen + hh_len, | |
1376 | (flags & MSG_DONTWAIT), &err); | |
1377 | } else { | |
1378 | skb = NULL; | |
1379 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1380 | 2 * sk->sk_sndbuf) | |
1381 | skb = sock_wmalloc(sk, | |
1382 | alloclen + hh_len, 1, | |
1383 | sk->sk_allocation); | |
1384 | if (unlikely(skb == NULL)) | |
1385 | err = -ENOBUFS; | |
1386 | } | |
1387 | if (skb == NULL) | |
1388 | goto error; | |
1389 | /* | |
1390 | * Fill in the control structures | |
1391 | */ | |
9c9c9ad5 | 1392 | skb->protocol = htons(ETH_P_IPV6); |
32dce968 | 1393 | skb->ip_summed = csummode; |
1da177e4 | 1394 | skb->csum = 0; |
1f85851e G |
1395 | /* reserve for fragmentation and ipsec header */ |
1396 | skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + | |
1397 | dst_exthdrlen); | |
1da177e4 | 1398 | |
11878b40 WB |
1399 | /* Only the initial fragment is time stamped */ |
1400 | skb_shinfo(skb)->tx_flags = tx_flags; | |
1401 | tx_flags = 0; | |
09c2d251 WB |
1402 | skb_shinfo(skb)->tskey = tskey; |
1403 | tskey = 0; | |
a693e698 | 1404 | |
1da177e4 LT |
1405 | /* |
1406 | * Find where to start putting bytes | |
1407 | */ | |
1f85851e G |
1408 | data = skb_put(skb, fraglen); |
1409 | skb_set_network_header(skb, exthdrlen); | |
1410 | data += fragheaderlen; | |
b0e380b1 ACM |
1411 | skb->transport_header = (skb->network_header + |
1412 | fragheaderlen); | |
1da177e4 LT |
1413 | if (fraggap) { |
1414 | skb->csum = skb_copy_and_csum_bits( | |
1415 | skb_prev, maxfraglen, | |
1416 | data + transhdrlen, fraggap, 0); | |
1417 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1418 | skb->csum); | |
1419 | data += fraggap; | |
e9fa4f7b | 1420 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1421 | } |
1422 | copy = datalen - transhdrlen - fraggap; | |
299b0767 | 1423 | |
1da177e4 LT |
1424 | if (copy < 0) { |
1425 | err = -EINVAL; | |
1426 | kfree_skb(skb); | |
1427 | goto error; | |
1428 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1429 | err = -EFAULT; | |
1430 | kfree_skb(skb); | |
1431 | goto error; | |
1432 | } | |
1433 | ||
1434 | offset += copy; | |
1435 | length -= datalen - fraggap; | |
1436 | transhdrlen = 0; | |
1437 | exthdrlen = 0; | |
299b0767 | 1438 | dst_exthdrlen = 0; |
1da177e4 LT |
1439 | |
1440 | /* | |
1441 | * Put the packet on the pending queue | |
1442 | */ | |
0bbe84a6 | 1443 | __skb_queue_tail(queue, skb); |
1da177e4 LT |
1444 | continue; |
1445 | } | |
1446 | ||
1447 | if (copy > length) | |
1448 | copy = length; | |
1449 | ||
d8d1f30b | 1450 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
1da177e4 LT |
1451 | unsigned int off; |
1452 | ||
1453 | off = skb->len; | |
1454 | if (getfrag(from, skb_put(skb, copy), | |
1455 | offset, copy, off, skb) < 0) { | |
1456 | __skb_trim(skb, off); | |
1457 | err = -EFAULT; | |
1458 | goto error; | |
1459 | } | |
1460 | } else { | |
1461 | int i = skb_shinfo(skb)->nr_frags; | |
1da177e4 | 1462 | |
5640f768 ED |
1463 | err = -ENOMEM; |
1464 | if (!sk_page_frag_refill(sk, pfrag)) | |
1da177e4 | 1465 | goto error; |
5640f768 ED |
1466 | |
1467 | if (!skb_can_coalesce(skb, i, pfrag->page, | |
1468 | pfrag->offset)) { | |
1469 | err = -EMSGSIZE; | |
1470 | if (i == MAX_SKB_FRAGS) | |
1471 | goto error; | |
1472 | ||
1473 | __skb_fill_page_desc(skb, i, pfrag->page, | |
1474 | pfrag->offset, 0); | |
1475 | skb_shinfo(skb)->nr_frags = ++i; | |
1476 | get_page(pfrag->page); | |
1da177e4 | 1477 | } |
5640f768 | 1478 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
9e903e08 | 1479 | if (getfrag(from, |
5640f768 ED |
1480 | page_address(pfrag->page) + pfrag->offset, |
1481 | offset, copy, skb->len, skb) < 0) | |
1482 | goto error_efault; | |
1483 | ||
1484 | pfrag->offset += copy; | |
1485 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1da177e4 LT |
1486 | skb->len += copy; |
1487 | skb->data_len += copy; | |
f945fa7a HX |
1488 | skb->truesize += copy; |
1489 | atomic_add(copy, &sk->sk_wmem_alloc); | |
1da177e4 LT |
1490 | } |
1491 | offset += copy; | |
1492 | length -= copy; | |
1493 | } | |
5640f768 | 1494 | |
1da177e4 | 1495 | return 0; |
5640f768 ED |
1496 | |
1497 | error_efault: | |
1498 | err = -EFAULT; | |
1da177e4 | 1499 | error: |
bdc712b4 | 1500 | cork->length -= length; |
3bd653c8 | 1501 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1502 | return err; |
1503 | } | |
0bbe84a6 VY |
1504 | |
1505 | int ip6_append_data(struct sock *sk, | |
1506 | int getfrag(void *from, char *to, int offset, int len, | |
1507 | int odd, struct sk_buff *skb), | |
1508 | void *from, int length, int transhdrlen, int hlimit, | |
1509 | int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, | |
1510 | struct rt6_info *rt, unsigned int flags, int dontfrag) | |
1511 | { | |
1512 | struct inet_sock *inet = inet_sk(sk); | |
1513 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1514 | int exthdrlen; | |
1515 | int err; | |
1516 | ||
1517 | if (flags&MSG_PROBE) | |
1518 | return 0; | |
1519 | if (skb_queue_empty(&sk->sk_write_queue)) { | |
1520 | /* | |
1521 | * setup for corking | |
1522 | */ | |
1523 | err = ip6_setup_cork(sk, &inet->cork, &np->cork, hlimit, | |
1524 | tclass, opt, rt, fl6); | |
1525 | if (err) | |
1526 | return err; | |
1527 | ||
1528 | exthdrlen = (opt ? opt->opt_flen : 0); | |
1529 | length += exthdrlen; | |
1530 | transhdrlen += exthdrlen; | |
1531 | } else { | |
1532 | fl6 = &inet->cork.fl.u.ip6; | |
1533 | transhdrlen = 0; | |
1534 | } | |
1535 | ||
1536 | return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base, | |
1537 | &np->cork, sk_page_frag(sk), getfrag, | |
1538 | from, length, transhdrlen, flags, dontfrag); | |
1539 | } | |
a495f836 | 1540 | EXPORT_SYMBOL_GPL(ip6_append_data); |
1da177e4 | 1541 | |
366e41d9 VY |
1542 | static void ip6_cork_release(struct inet_cork_full *cork, |
1543 | struct inet6_cork *v6_cork) | |
bf138862 | 1544 | { |
366e41d9 VY |
1545 | if (v6_cork->opt) { |
1546 | kfree(v6_cork->opt->dst0opt); | |
1547 | kfree(v6_cork->opt->dst1opt); | |
1548 | kfree(v6_cork->opt->hopopt); | |
1549 | kfree(v6_cork->opt->srcrt); | |
1550 | kfree(v6_cork->opt); | |
1551 | v6_cork->opt = NULL; | |
0178b695 HX |
1552 | } |
1553 | ||
366e41d9 VY |
1554 | if (cork->base.dst) { |
1555 | dst_release(cork->base.dst); | |
1556 | cork->base.dst = NULL; | |
1557 | cork->base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 | 1558 | } |
366e41d9 | 1559 | memset(&cork->fl, 0, sizeof(cork->fl)); |
bf138862 PE |
1560 | } |
1561 | ||
6422398c VY |
1562 | struct sk_buff *__ip6_make_skb(struct sock *sk, |
1563 | struct sk_buff_head *queue, | |
1564 | struct inet_cork_full *cork, | |
1565 | struct inet6_cork *v6_cork) | |
1da177e4 LT |
1566 | { |
1567 | struct sk_buff *skb, *tmp_skb; | |
1568 | struct sk_buff **tail_skb; | |
1569 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1da177e4 | 1570 | struct ipv6_pinfo *np = inet6_sk(sk); |
3bd653c8 | 1571 | struct net *net = sock_net(sk); |
1da177e4 | 1572 | struct ipv6hdr *hdr; |
6422398c VY |
1573 | struct ipv6_txoptions *opt = v6_cork->opt; |
1574 | struct rt6_info *rt = (struct rt6_info *)cork->base.dst; | |
1575 | struct flowi6 *fl6 = &cork->fl.u.ip6; | |
4c9483b2 | 1576 | unsigned char proto = fl6->flowi6_proto; |
1da177e4 | 1577 | |
6422398c | 1578 | skb = __skb_dequeue(queue); |
e5d08d71 | 1579 | if (skb == NULL) |
1da177e4 LT |
1580 | goto out; |
1581 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1582 | ||
1583 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1584 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1585 | __skb_pull(skb, skb_network_offset(skb)); |
6422398c | 1586 | while ((tmp_skb = __skb_dequeue(queue)) != NULL) { |
cfe1fc77 | 1587 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1588 | *tail_skb = tmp_skb; |
1589 | tail_skb = &(tmp_skb->next); | |
1590 | skb->len += tmp_skb->len; | |
1591 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1592 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1593 | tmp_skb->destructor = NULL; |
1594 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1595 | } |
1596 | ||
28a89453 | 1597 | /* Allow local fragmentation. */ |
60ff7467 | 1598 | skb->ignore_df = ip6_sk_ignore_df(sk); |
28a89453 | 1599 | |
4e3fd7a0 | 1600 | *final_dst = fl6->daddr; |
cfe1fc77 | 1601 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1602 | if (opt && opt->opt_flen) |
1603 | ipv6_push_frag_opts(skb, opt, &proto); | |
1604 | if (opt && opt->opt_nflen) | |
1605 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1606 | ||
e2d1bca7 ACM |
1607 | skb_push(skb, sizeof(struct ipv6hdr)); |
1608 | skb_reset_network_header(skb); | |
0660e03f | 1609 | hdr = ipv6_hdr(skb); |
1ab1457c | 1610 | |
6422398c | 1611 | ip6_flow_hdr(hdr, v6_cork->tclass, |
cb1ce2ef TH |
1612 | ip6_make_flowlabel(net, skb, fl6->flowlabel, |
1613 | np->autoflowlabel)); | |
6422398c | 1614 | hdr->hop_limit = v6_cork->hop_limit; |
1da177e4 | 1615 | hdr->nexthdr = proto; |
4e3fd7a0 AD |
1616 | hdr->saddr = fl6->saddr; |
1617 | hdr->daddr = *final_dst; | |
1da177e4 | 1618 | |
a2c2064f | 1619 | skb->priority = sk->sk_priority; |
4a19ec58 | 1620 | skb->mark = sk->sk_mark; |
a2c2064f | 1621 | |
d8d1f30b | 1622 | skb_dst_set(skb, dst_clone(&rt->dst)); |
edf391ff | 1623 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1624 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1625 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1626 | |
43a43b60 HFS |
1627 | ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type); |
1628 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); | |
14878f75 DS |
1629 | } |
1630 | ||
6422398c VY |
1631 | ip6_cork_release(cork, v6_cork); |
1632 | out: | |
1633 | return skb; | |
1634 | } | |
1635 | ||
1636 | int ip6_send_skb(struct sk_buff *skb) | |
1637 | { | |
1638 | struct net *net = sock_net(skb->sk); | |
1639 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); | |
1640 | int err; | |
1641 | ||
ef76bc23 | 1642 | err = ip6_local_out(skb); |
1da177e4 LT |
1643 | if (err) { |
1644 | if (err > 0) | |
6ce9e7b5 | 1645 | err = net_xmit_errno(err); |
1da177e4 | 1646 | if (err) |
6422398c VY |
1647 | IP6_INC_STATS(net, rt->rt6i_idev, |
1648 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
1649 | } |
1650 | ||
1da177e4 | 1651 | return err; |
6422398c VY |
1652 | } |
1653 | ||
1654 | int ip6_push_pending_frames(struct sock *sk) | |
1655 | { | |
1656 | struct sk_buff *skb; | |
1657 | ||
1658 | skb = ip6_finish_skb(sk); | |
1659 | if (!skb) | |
1660 | return 0; | |
1661 | ||
1662 | return ip6_send_skb(skb); | |
1da177e4 | 1663 | } |
a495f836 | 1664 | EXPORT_SYMBOL_GPL(ip6_push_pending_frames); |
1da177e4 | 1665 | |
0bbe84a6 | 1666 | static void __ip6_flush_pending_frames(struct sock *sk, |
6422398c VY |
1667 | struct sk_buff_head *queue, |
1668 | struct inet_cork_full *cork, | |
1669 | struct inet6_cork *v6_cork) | |
1da177e4 | 1670 | { |
1da177e4 LT |
1671 | struct sk_buff *skb; |
1672 | ||
0bbe84a6 | 1673 | while ((skb = __skb_dequeue_tail(queue)) != NULL) { |
adf30907 ED |
1674 | if (skb_dst(skb)) |
1675 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1676 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1677 | kfree_skb(skb); |
1678 | } | |
1679 | ||
6422398c | 1680 | ip6_cork_release(cork, v6_cork); |
1da177e4 | 1681 | } |
0bbe84a6 VY |
1682 | |
1683 | void ip6_flush_pending_frames(struct sock *sk) | |
1684 | { | |
6422398c VY |
1685 | __ip6_flush_pending_frames(sk, &sk->sk_write_queue, |
1686 | &inet_sk(sk)->cork, &inet6_sk(sk)->cork); | |
0bbe84a6 | 1687 | } |
a495f836 | 1688 | EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); |
6422398c VY |
1689 | |
1690 | struct sk_buff *ip6_make_skb(struct sock *sk, | |
1691 | int getfrag(void *from, char *to, int offset, | |
1692 | int len, int odd, struct sk_buff *skb), | |
1693 | void *from, int length, int transhdrlen, | |
1694 | int hlimit, int tclass, | |
1695 | struct ipv6_txoptions *opt, struct flowi6 *fl6, | |
1696 | struct rt6_info *rt, unsigned int flags, | |
1697 | int dontfrag) | |
1698 | { | |
1699 | struct inet_cork_full cork; | |
1700 | struct inet6_cork v6_cork; | |
1701 | struct sk_buff_head queue; | |
1702 | int exthdrlen = (opt ? opt->opt_flen : 0); | |
1703 | int err; | |
1704 | ||
1705 | if (flags & MSG_PROBE) | |
1706 | return NULL; | |
1707 | ||
1708 | __skb_queue_head_init(&queue); | |
1709 | ||
1710 | cork.base.flags = 0; | |
1711 | cork.base.addr = 0; | |
1712 | cork.base.opt = NULL; | |
1713 | v6_cork.opt = NULL; | |
1714 | err = ip6_setup_cork(sk, &cork, &v6_cork, hlimit, tclass, opt, rt, fl6); | |
1715 | if (err) | |
1716 | return ERR_PTR(err); | |
1717 | ||
1718 | if (dontfrag < 0) | |
1719 | dontfrag = inet6_sk(sk)->dontfrag; | |
1720 | ||
1721 | err = __ip6_append_data(sk, fl6, &queue, &cork.base, &v6_cork, | |
1722 | ¤t->task_frag, getfrag, from, | |
1723 | length + exthdrlen, transhdrlen + exthdrlen, | |
1724 | flags, dontfrag); | |
1725 | if (err) { | |
1726 | __ip6_flush_pending_frames(sk, &queue, &cork, &v6_cork); | |
1727 | return ERR_PTR(err); | |
1728 | } | |
1729 | ||
1730 | return __ip6_make_skb(sk, &queue, &cork, &v6_cork); | |
1731 | } |