Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IPv6 output functions | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * Based on linux/net/ipv4/ip_output.c |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * Changes: | |
16 | * A.N.Kuznetsov : airthmetics in fragmentation. | |
17 | * extension headers are implemented. | |
18 | * route changes now work. | |
19 | * ip6_forward does not confuse sniffers. | |
20 | * etc. | |
21 | * | |
22 | * H. von Brand : Added missing #include <linux/string.h> | |
23 | * Imran Patel : frag id should be in NBO | |
24 | * Kazunori MIYAZAWA @USAGI | |
25 | * : add ip6_append_data and related functions | |
26 | * for datagram xmit | |
27 | */ | |
28 | ||
1da177e4 | 29 | #include <linux/errno.h> |
ef76bc23 | 30 | #include <linux/kernel.h> |
1da177e4 LT |
31 | #include <linux/string.h> |
32 | #include <linux/socket.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/if_arp.h> | |
36 | #include <linux/in6.h> | |
37 | #include <linux/tcp.h> | |
38 | #include <linux/route.h> | |
b59f45d0 | 39 | #include <linux/module.h> |
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 | |
3e4e4c1f | 208 | ip6_flow_hdr(hdr, tclass, fl6->flowlabel); |
41a1f8ea | 209 | |
1da177e4 LT |
210 | hdr->payload_len = htons(seg_len); |
211 | hdr->nexthdr = proto; | |
212 | hdr->hop_limit = hlimit; | |
213 | ||
4e3fd7a0 AD |
214 | hdr->saddr = fl6->saddr; |
215 | hdr->daddr = *first_hop; | |
1da177e4 | 216 | |
9c9c9ad5 | 217 | skb->protocol = htons(ETH_P_IPV6); |
a2c2064f | 218 | skb->priority = sk->sk_priority; |
4a19ec58 | 219 | skb->mark = sk->sk_mark; |
a2c2064f | 220 | |
1da177e4 | 221 | mtu = dst_mtu(dst); |
60ff7467 | 222 | if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) { |
adf30907 | 223 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 224 | IPSTATS_MIB_OUT, skb->len); |
b2e0b385 JE |
225 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
226 | dst->dev, dst_output); | |
1da177e4 LT |
227 | } |
228 | ||
1da177e4 | 229 | skb->dev = dst->dev; |
f4e53e29 | 230 | ipv6_local_error(sk, EMSGSIZE, fl6, mtu); |
adf30907 | 231 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
232 | kfree_skb(skb); |
233 | return -EMSGSIZE; | |
234 | } | |
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 | ||
73f156a6 ED |
540 | static void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) |
541 | { | |
542 | static u32 ip6_idents_hashrnd __read_mostly; | |
543 | u32 hash, id; | |
544 | ||
545 | net_get_random_once(&ip6_idents_hashrnd, sizeof(ip6_idents_hashrnd)); | |
546 | ||
547 | hash = __ipv6_addr_jhash(&rt->rt6i_dst.addr, ip6_idents_hashrnd); | |
548 | id = ip_idents_reserve(hash, 1); | |
549 | fhdr->identification = htonl(id); | |
550 | } | |
551 | ||
ad0081e4 | 552 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
1da177e4 | 553 | { |
1da177e4 | 554 | struct sk_buff *frag; |
adf30907 | 555 | struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); |
d91675f9 | 556 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
557 | struct ipv6hdr *tmp_hdr; |
558 | struct frag_hdr *fh; | |
559 | unsigned int mtu, hlen, left, len; | |
a7ae1992 | 560 | int hroom, troom; |
ae08e1f0 | 561 | __be32 frag_id = 0; |
1da177e4 LT |
562 | int ptr, offset = 0, err=0; |
563 | u8 *prevhdr, nexthdr = 0; | |
adf30907 | 564 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 565 | |
1da177e4 LT |
566 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
567 | nexthdr = *prevhdr; | |
568 | ||
628a5c56 | 569 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
570 | |
571 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 572 | * or if the skb it not generated by a local socket. |
b881ef76 | 573 | */ |
60ff7467 | 574 | if (unlikely(!skb->ignore_df && skb->len > mtu) || |
4cdd3408 PM |
575 | (IP6CB(skb)->frag_max_size && |
576 | IP6CB(skb)->frag_max_size > mtu)) { | |
a34a101e ED |
577 | if (skb->sk && dst_allfrag(skb_dst(skb))) |
578 | sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK); | |
579 | ||
adf30907 | 580 | skb->dev = skb_dst(skb)->dev; |
3ffe533c | 581 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 582 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 583 | IPSTATS_MIB_FRAGFAILS); |
b881ef76 JH |
584 | kfree_skb(skb); |
585 | return -EMSGSIZE; | |
586 | } | |
587 | ||
d91675f9 YH |
588 | if (np && np->frag_size < mtu) { |
589 | if (np->frag_size) | |
590 | mtu = np->frag_size; | |
591 | } | |
592 | mtu -= hlen + sizeof(struct frag_hdr); | |
1da177e4 | 593 | |
21dc3301 | 594 | if (skb_has_frag_list(skb)) { |
1da177e4 | 595 | int first_len = skb_pagelen(skb); |
3d13008e | 596 | struct sk_buff *frag2; |
1da177e4 LT |
597 | |
598 | if (first_len - hlen > mtu || | |
599 | ((first_len - hlen) & 7) || | |
600 | skb_cloned(skb)) | |
601 | goto slow_path; | |
602 | ||
4d9092bb | 603 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
604 | /* Correct geometry. */ |
605 | if (frag->len > mtu || | |
606 | ((frag->len & 7) && frag->next) || | |
607 | skb_headroom(frag) < hlen) | |
3d13008e | 608 | goto slow_path_clean; |
1da177e4 | 609 | |
1da177e4 LT |
610 | /* Partially cloned skb? */ |
611 | if (skb_shared(frag)) | |
3d13008e | 612 | goto slow_path_clean; |
2fdba6b0 HX |
613 | |
614 | BUG_ON(frag->sk); | |
615 | if (skb->sk) { | |
2fdba6b0 HX |
616 | frag->sk = skb->sk; |
617 | frag->destructor = sock_wfree; | |
2fdba6b0 | 618 | } |
3d13008e | 619 | skb->truesize -= frag->truesize; |
1da177e4 LT |
620 | } |
621 | ||
622 | err = 0; | |
623 | offset = 0; | |
624 | frag = skb_shinfo(skb)->frag_list; | |
4d9092bb | 625 | skb_frag_list_init(skb); |
1da177e4 LT |
626 | /* BUILD HEADER */ |
627 | ||
9a217a1c | 628 | *prevhdr = NEXTHDR_FRAGMENT; |
d56f90a7 | 629 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
1da177e4 | 630 | if (!tmp_hdr) { |
adf30907 | 631 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 632 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
633 | return -ENOMEM; |
634 | } | |
635 | ||
1da177e4 LT |
636 | __skb_pull(skb, hlen); |
637 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
e2d1bca7 ACM |
638 | __skb_push(skb, hlen); |
639 | skb_reset_network_header(skb); | |
d56f90a7 | 640 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
1da177e4 | 641 | |
87c48fa3 | 642 | ipv6_select_ident(fh, rt); |
1da177e4 LT |
643 | fh->nexthdr = nexthdr; |
644 | fh->reserved = 0; | |
645 | fh->frag_off = htons(IP6_MF); | |
646 | frag_id = fh->identification; | |
647 | ||
648 | first_len = skb_pagelen(skb); | |
649 | skb->data_len = first_len - skb_headlen(skb); | |
650 | skb->len = first_len; | |
0660e03f ACM |
651 | ipv6_hdr(skb)->payload_len = htons(first_len - |
652 | sizeof(struct ipv6hdr)); | |
a11d206d | 653 | |
d8d1f30b | 654 | dst_hold(&rt->dst); |
1da177e4 LT |
655 | |
656 | for (;;) { | |
657 | /* Prepare header of the next frame, | |
658 | * before previous one went down. */ | |
659 | if (frag) { | |
660 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 661 | skb_reset_transport_header(frag); |
1da177e4 | 662 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
663 | __skb_push(frag, hlen); |
664 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
665 | memcpy(skb_network_header(frag), tmp_hdr, |
666 | hlen); | |
1da177e4 LT |
667 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
668 | fh->nexthdr = nexthdr; | |
669 | fh->reserved = 0; | |
670 | fh->frag_off = htons(offset); | |
671 | if (frag->next != NULL) | |
672 | fh->frag_off |= htons(IP6_MF); | |
673 | fh->identification = frag_id; | |
0660e03f ACM |
674 | ipv6_hdr(frag)->payload_len = |
675 | htons(frag->len - | |
676 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
677 | ip6_copy_metadata(frag, skb); |
678 | } | |
1ab1457c | 679 | |
1da177e4 | 680 | err = output(skb); |
dafee490 | 681 | if(!err) |
d8d1f30b | 682 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 683 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 684 | |
1da177e4 LT |
685 | if (err || !frag) |
686 | break; | |
687 | ||
688 | skb = frag; | |
689 | frag = skb->next; | |
690 | skb->next = NULL; | |
691 | } | |
692 | ||
a51482bd | 693 | kfree(tmp_hdr); |
1da177e4 LT |
694 | |
695 | if (err == 0) { | |
d8d1f30b | 696 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 697 | IPSTATS_MIB_FRAGOKS); |
94e187c0 | 698 | ip6_rt_put(rt); |
1da177e4 LT |
699 | return 0; |
700 | } | |
701 | ||
702 | while (frag) { | |
703 | skb = frag->next; | |
704 | kfree_skb(frag); | |
705 | frag = skb; | |
706 | } | |
707 | ||
d8d1f30b | 708 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 709 | IPSTATS_MIB_FRAGFAILS); |
94e187c0 | 710 | ip6_rt_put(rt); |
1da177e4 | 711 | return err; |
3d13008e ED |
712 | |
713 | slow_path_clean: | |
714 | skb_walk_frags(skb, frag2) { | |
715 | if (frag2 == frag) | |
716 | break; | |
717 | frag2->sk = NULL; | |
718 | frag2->destructor = NULL; | |
719 | skb->truesize += frag2->truesize; | |
720 | } | |
1da177e4 LT |
721 | } |
722 | ||
723 | slow_path: | |
72e843bb ED |
724 | if ((skb->ip_summed == CHECKSUM_PARTIAL) && |
725 | skb_checksum_help(skb)) | |
726 | goto fail; | |
727 | ||
1da177e4 LT |
728 | left = skb->len - hlen; /* Space per frame */ |
729 | ptr = hlen; /* Where to start from */ | |
730 | ||
731 | /* | |
732 | * Fragment the datagram. | |
733 | */ | |
734 | ||
735 | *prevhdr = NEXTHDR_FRAGMENT; | |
a7ae1992 HX |
736 | hroom = LL_RESERVED_SPACE(rt->dst.dev); |
737 | troom = rt->dst.dev->needed_tailroom; | |
1da177e4 LT |
738 | |
739 | /* | |
740 | * Keep copying data until we run out. | |
741 | */ | |
742 | while(left > 0) { | |
743 | len = left; | |
744 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
745 | if (len > mtu) | |
746 | len = mtu; | |
25985edc | 747 | /* IF: we are not sending up to and including the packet end |
1da177e4 LT |
748 | then align the next start on an eight byte boundary */ |
749 | if (len < left) { | |
750 | len &= ~7; | |
751 | } | |
752 | /* | |
753 | * Allocate buffer. | |
754 | */ | |
755 | ||
a7ae1992 HX |
756 | if ((frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) + |
757 | hroom + troom, GFP_ATOMIC)) == NULL) { | |
64ce2073 | 758 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
adf30907 | 759 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 760 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
761 | err = -ENOMEM; |
762 | goto fail; | |
763 | } | |
764 | ||
765 | /* | |
766 | * Set up data on packet | |
767 | */ | |
768 | ||
769 | ip6_copy_metadata(frag, skb); | |
a7ae1992 | 770 | skb_reserve(frag, hroom); |
1da177e4 | 771 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
c1d2bbe1 | 772 | skb_reset_network_header(frag); |
badff6d0 | 773 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
b0e380b1 ACM |
774 | frag->transport_header = (frag->network_header + hlen + |
775 | sizeof(struct frag_hdr)); | |
1da177e4 LT |
776 | |
777 | /* | |
778 | * Charge the memory for the fragment to any owner | |
779 | * it might possess | |
780 | */ | |
781 | if (skb->sk) | |
782 | skb_set_owner_w(frag, skb->sk); | |
783 | ||
784 | /* | |
785 | * Copy the packet header into the new buffer. | |
786 | */ | |
d626f62b | 787 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
1da177e4 LT |
788 | |
789 | /* | |
790 | * Build fragment header. | |
791 | */ | |
792 | fh->nexthdr = nexthdr; | |
793 | fh->reserved = 0; | |
f36d6ab1 | 794 | if (!frag_id) { |
87c48fa3 | 795 | ipv6_select_ident(fh, rt); |
1da177e4 LT |
796 | frag_id = fh->identification; |
797 | } else | |
798 | fh->identification = frag_id; | |
799 | ||
800 | /* | |
801 | * Copy a block of the IP datagram. | |
802 | */ | |
8984e41d | 803 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
1da177e4 LT |
804 | BUG(); |
805 | left -= len; | |
806 | ||
807 | fh->frag_off = htons(offset); | |
808 | if (left > 0) | |
809 | fh->frag_off |= htons(IP6_MF); | |
0660e03f ACM |
810 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
811 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
812 | |
813 | ptr += len; | |
814 | offset += len; | |
815 | ||
816 | /* | |
817 | * Put this fragment into the sending queue. | |
818 | */ | |
1da177e4 LT |
819 | err = output(frag); |
820 | if (err) | |
821 | goto fail; | |
dafee490 | 822 | |
adf30907 | 823 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 824 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 825 | } |
adf30907 | 826 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 827 | IPSTATS_MIB_FRAGOKS); |
808db80a | 828 | consume_skb(skb); |
1da177e4 LT |
829 | return err; |
830 | ||
831 | fail: | |
adf30907 | 832 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 833 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 834 | kfree_skb(skb); |
1da177e4 LT |
835 | return err; |
836 | } | |
837 | ||
b71d1d42 ED |
838 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
839 | const struct in6_addr *fl_addr, | |
840 | const struct in6_addr *addr_cache) | |
cf6b1982 | 841 | { |
a02cec21 ED |
842 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
843 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)); | |
cf6b1982 YH |
844 | } |
845 | ||
497c615a HX |
846 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
847 | struct dst_entry *dst, | |
b71d1d42 | 848 | const struct flowi6 *fl6) |
1da177e4 | 849 | { |
497c615a | 850 | struct ipv6_pinfo *np = inet6_sk(sk); |
a963a37d | 851 | struct rt6_info *rt; |
1da177e4 | 852 | |
497c615a HX |
853 | if (!dst) |
854 | goto out; | |
855 | ||
a963a37d ED |
856 | if (dst->ops->family != AF_INET6) { |
857 | dst_release(dst); | |
858 | return NULL; | |
859 | } | |
860 | ||
861 | rt = (struct rt6_info *)dst; | |
497c615a HX |
862 | /* Yes, checking route validity in not connected |
863 | * case is not very simple. Take into account, | |
864 | * that we do not support routing by source, TOS, | |
865 | * and MSG_DONTROUTE --ANK (980726) | |
866 | * | |
cf6b1982 YH |
867 | * 1. ip6_rt_check(): If route was host route, |
868 | * check that cached destination is current. | |
497c615a HX |
869 | * If it is network route, we still may |
870 | * check its validity using saved pointer | |
871 | * to the last used address: daddr_cache. | |
872 | * We do not want to save whole address now, | |
873 | * (because main consumer of this service | |
874 | * is tcp, which has not this problem), | |
875 | * so that the last trick works only on connected | |
876 | * sockets. | |
877 | * 2. oif also should be the same. | |
878 | */ | |
4c9483b2 | 879 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
8e1ef0a9 | 880 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 881 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
8e1ef0a9 | 882 | #endif |
4c9483b2 | 883 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) { |
497c615a HX |
884 | dst_release(dst); |
885 | dst = NULL; | |
1da177e4 LT |
886 | } |
887 | ||
497c615a HX |
888 | out: |
889 | return dst; | |
890 | } | |
891 | ||
892 | static int ip6_dst_lookup_tail(struct sock *sk, | |
4c9483b2 | 893 | struct dst_entry **dst, struct flowi6 *fl6) |
497c615a | 894 | { |
3b1e0a65 | 895 | struct net *net = sock_net(sk); |
69cce1d1 DM |
896 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
897 | struct neighbour *n; | |
97cac082 | 898 | struct rt6_info *rt; |
69cce1d1 DM |
899 | #endif |
900 | int err; | |
497c615a | 901 | |
1da177e4 | 902 | if (*dst == NULL) |
4c9483b2 | 903 | *dst = ip6_route_output(net, sk, fl6); |
1da177e4 LT |
904 | |
905 | if ((err = (*dst)->error)) | |
906 | goto out_err_release; | |
907 | ||
4c9483b2 | 908 | if (ipv6_addr_any(&fl6->saddr)) { |
c3968a85 DW |
909 | struct rt6_info *rt = (struct rt6_info *) *dst; |
910 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
911 | sk ? inet6_sk(sk)->srcprefs : 0, | |
912 | &fl6->saddr); | |
44456d37 | 913 | if (err) |
1da177e4 | 914 | goto out_err_release; |
1da177e4 LT |
915 | } |
916 | ||
95c385b4 | 917 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
918 | /* |
919 | * Here if the dst entry we've looked up | |
920 | * has a neighbour entry that is in the INCOMPLETE | |
921 | * state and the src address from the flow is | |
922 | * marked as OPTIMISTIC, we release the found | |
923 | * dst entry and replace it instead with the | |
924 | * dst entry of the nexthop router | |
925 | */ | |
c56bf6fe | 926 | rt = (struct rt6_info *) *dst; |
707be1ff | 927 | rcu_read_lock_bh(); |
550bab42 | 928 | n = __ipv6_neigh_lookup_noref(rt->dst.dev, rt6_nexthop(rt)); |
707be1ff YH |
929 | err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0; |
930 | rcu_read_unlock_bh(); | |
931 | ||
932 | if (err) { | |
e550dfb0 | 933 | struct inet6_ifaddr *ifp; |
4c9483b2 | 934 | struct flowi6 fl_gw6; |
e550dfb0 NH |
935 | int redirect; |
936 | ||
4c9483b2 | 937 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
e550dfb0 NH |
938 | (*dst)->dev, 1); |
939 | ||
940 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
941 | if (ifp) | |
942 | in6_ifa_put(ifp); | |
943 | ||
944 | if (redirect) { | |
945 | /* | |
946 | * We need to get the dst entry for the | |
947 | * default router instead | |
948 | */ | |
949 | dst_release(*dst); | |
4c9483b2 DM |
950 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
951 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
952 | *dst = ip6_route_output(net, sk, &fl_gw6); | |
e550dfb0 NH |
953 | if ((err = (*dst)->error)) |
954 | goto out_err_release; | |
95c385b4 | 955 | } |
e550dfb0 | 956 | } |
95c385b4 NH |
957 | #endif |
958 | ||
1da177e4 LT |
959 | return 0; |
960 | ||
961 | out_err_release: | |
ca46f9c8 | 962 | if (err == -ENETUNREACH) |
5ac68e7c | 963 | IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
964 | dst_release(*dst); |
965 | *dst = NULL; | |
966 | return err; | |
967 | } | |
34a0b3cd | 968 | |
497c615a HX |
969 | /** |
970 | * ip6_dst_lookup - perform route lookup on flow | |
971 | * @sk: socket which provides route info | |
972 | * @dst: pointer to dst_entry * for result | |
4c9483b2 | 973 | * @fl6: flow to lookup |
497c615a HX |
974 | * |
975 | * This function performs a route lookup on the given flow. | |
976 | * | |
977 | * It returns zero on success, or a standard errno code on error. | |
978 | */ | |
4c9483b2 | 979 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6) |
497c615a HX |
980 | { |
981 | *dst = NULL; | |
4c9483b2 | 982 | return ip6_dst_lookup_tail(sk, dst, fl6); |
497c615a | 983 | } |
3cf3dc6c ACM |
984 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
985 | ||
497c615a | 986 | /** |
68d0c6d3 DM |
987 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
988 | * @sk: socket which provides route info | |
4c9483b2 | 989 | * @fl6: flow to lookup |
68d0c6d3 | 990 | * @final_dst: final destination address for ipsec lookup |
68d0c6d3 DM |
991 | * |
992 | * This function performs a route lookup on the given flow. | |
993 | * | |
994 | * It returns a valid dst pointer on success, or a pointer encoded | |
995 | * error code. | |
996 | */ | |
4c9483b2 | 997 | struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 998 | const struct in6_addr *final_dst) |
68d0c6d3 DM |
999 | { |
1000 | struct dst_entry *dst = NULL; | |
1001 | int err; | |
1002 | ||
4c9483b2 | 1003 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1004 | if (err) |
1005 | return ERR_PTR(err); | |
1006 | if (final_dst) | |
4e3fd7a0 | 1007 | fl6->daddr = *final_dst; |
2774c131 | 1008 | |
4c9483b2 | 1009 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
68d0c6d3 DM |
1010 | } |
1011 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
1012 | ||
1013 | /** | |
1014 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
497c615a | 1015 | * @sk: socket which provides the dst cache and route info |
4c9483b2 | 1016 | * @fl6: flow to lookup |
68d0c6d3 | 1017 | * @final_dst: final destination address for ipsec lookup |
497c615a HX |
1018 | * |
1019 | * This function performs a route lookup on the given flow with the | |
1020 | * possibility of using the cached route in the socket if it is valid. | |
1021 | * It will take the socket dst lock when operating on the dst cache. | |
1022 | * As a result, this function can only be used in process context. | |
1023 | * | |
68d0c6d3 DM |
1024 | * It returns a valid dst pointer on success, or a pointer encoded |
1025 | * error code. | |
497c615a | 1026 | */ |
4c9483b2 | 1027 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 1028 | const struct in6_addr *final_dst) |
497c615a | 1029 | { |
68d0c6d3 DM |
1030 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
1031 | int err; | |
497c615a | 1032 | |
4c9483b2 | 1033 | dst = ip6_sk_dst_check(sk, dst, fl6); |
68d0c6d3 | 1034 | |
4c9483b2 | 1035 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1036 | if (err) |
1037 | return ERR_PTR(err); | |
1038 | if (final_dst) | |
4e3fd7a0 | 1039 | fl6->daddr = *final_dst; |
2774c131 | 1040 | |
4c9483b2 | 1041 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
497c615a | 1042 | } |
68d0c6d3 | 1043 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
497c615a | 1044 | |
34a0b3cd | 1045 | static inline int ip6_ufo_append_data(struct sock *sk, |
e89e9cf5 AR |
1046 | int getfrag(void *from, char *to, int offset, int len, |
1047 | int odd, struct sk_buff *skb), | |
1048 | void *from, int length, int hh_len, int fragheaderlen, | |
87c48fa3 ED |
1049 | int transhdrlen, int mtu,unsigned int flags, |
1050 | struct rt6_info *rt) | |
e89e9cf5 AR |
1051 | |
1052 | { | |
1053 | struct sk_buff *skb; | |
c547dbf5 | 1054 | struct frag_hdr fhdr; |
e89e9cf5 AR |
1055 | int err; |
1056 | ||
1057 | /* There is support for UDP large send offload by network | |
1058 | * device, so create one single skb packet containing complete | |
1059 | * udp datagram | |
1060 | */ | |
1061 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
1062 | skb = sock_alloc_send_skb(sk, | |
1063 | hh_len + fragheaderlen + transhdrlen + 20, | |
1064 | (flags & MSG_DONTWAIT), &err); | |
1065 | if (skb == NULL) | |
504744e4 | 1066 | return err; |
e89e9cf5 AR |
1067 | |
1068 | /* reserve space for Hardware header */ | |
1069 | skb_reserve(skb, hh_len); | |
1070 | ||
1071 | /* create space for UDP/IP header */ | |
1072 | skb_put(skb,fragheaderlen + transhdrlen); | |
1073 | ||
1074 | /* initialize network header pointer */ | |
c1d2bbe1 | 1075 | skb_reset_network_header(skb); |
e89e9cf5 AR |
1076 | |
1077 | /* initialize protocol header pointer */ | |
b0e380b1 | 1078 | skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf5 | 1079 | |
9c9c9ad5 | 1080 | skb->protocol = htons(ETH_P_IPV6); |
e89e9cf5 | 1081 | skb->csum = 0; |
e89e9cf5 | 1082 | |
e89e9cf5 | 1083 | __skb_queue_tail(&sk->sk_write_queue, skb); |
c547dbf5 JP |
1084 | } else if (skb_is_gso(skb)) { |
1085 | goto append; | |
e89e9cf5 | 1086 | } |
e89e9cf5 | 1087 | |
c547dbf5 JP |
1088 | skb->ip_summed = CHECKSUM_PARTIAL; |
1089 | /* Specify the length of each IPv6 datagram fragment. | |
1090 | * It has to be a multiple of 8. | |
1091 | */ | |
1092 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - | |
1093 | sizeof(struct frag_hdr)) & ~7; | |
1094 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
1095 | ipv6_select_ident(&fhdr, rt); | |
1096 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; | |
1097 | ||
1098 | append: | |
2811ebac HFS |
1099 | return skb_append_datato_frags(sk, skb, getfrag, from, |
1100 | (length - transhdrlen)); | |
e89e9cf5 | 1101 | } |
1da177e4 | 1102 | |
0178b695 HX |
1103 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1104 | gfp_t gfp) | |
1105 | { | |
1106 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1107 | } | |
1108 | ||
1109 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1110 | gfp_t gfp) | |
1111 | { | |
1112 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1113 | } | |
1114 | ||
75a493e6 | 1115 | static void ip6_append_data_mtu(unsigned int *mtu, |
0c183379 G |
1116 | int *maxfraglen, |
1117 | unsigned int fragheaderlen, | |
1118 | struct sk_buff *skb, | |
75a493e6 | 1119 | struct rt6_info *rt, |
e367c2d0 | 1120 | unsigned int orig_mtu) |
0c183379 G |
1121 | { |
1122 | if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { | |
1123 | if (skb == NULL) { | |
1124 | /* first fragment, reserve header_len */ | |
e367c2d0 | 1125 | *mtu = orig_mtu - rt->dst.header_len; |
0c183379 G |
1126 | |
1127 | } else { | |
1128 | /* | |
1129 | * this fragment is not first, the headers | |
1130 | * space is regarded as data space. | |
1131 | */ | |
e367c2d0 | 1132 | *mtu = orig_mtu; |
0c183379 G |
1133 | } |
1134 | *maxfraglen = ((*mtu - fragheaderlen) & ~7) | |
1135 | + fragheaderlen - sizeof(struct frag_hdr); | |
1136 | } | |
1137 | } | |
1138 | ||
41a1f8ea YH |
1139 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
1140 | int offset, int len, int odd, struct sk_buff *skb), | |
1141 | void *from, int length, int transhdrlen, | |
4c9483b2 | 1142 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, |
13b52cd4 | 1143 | struct rt6_info *rt, unsigned int flags, int dontfrag) |
1da177e4 LT |
1144 | { |
1145 | struct inet_sock *inet = inet_sk(sk); | |
1146 | struct ipv6_pinfo *np = inet6_sk(sk); | |
bdc712b4 | 1147 | struct inet_cork *cork; |
0c183379 | 1148 | struct sk_buff *skb, *skb_prev = NULL; |
e367c2d0 | 1149 | unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu; |
1da177e4 | 1150 | int exthdrlen; |
299b0767 | 1151 | int dst_exthdrlen; |
1da177e4 | 1152 | int hh_len; |
1da177e4 LT |
1153 | int copy; |
1154 | int err; | |
1155 | int offset = 0; | |
a693e698 | 1156 | __u8 tx_flags = 0; |
1da177e4 LT |
1157 | |
1158 | if (flags&MSG_PROBE) | |
1159 | return 0; | |
bdc712b4 | 1160 | cork = &inet->cork.base; |
1da177e4 LT |
1161 | if (skb_queue_empty(&sk->sk_write_queue)) { |
1162 | /* | |
1163 | * setup for corking | |
1164 | */ | |
1165 | if (opt) { | |
0178b695 | 1166 | if (WARN_ON(np->cork.opt)) |
1da177e4 | 1167 | return -EINVAL; |
0178b695 | 1168 | |
284041ef | 1169 | np->cork.opt = kzalloc(opt->tot_len, sk->sk_allocation); |
0178b695 HX |
1170 | if (unlikely(np->cork.opt == NULL)) |
1171 | return -ENOBUFS; | |
1172 | ||
1173 | np->cork.opt->tot_len = opt->tot_len; | |
1174 | np->cork.opt->opt_flen = opt->opt_flen; | |
1175 | np->cork.opt->opt_nflen = opt->opt_nflen; | |
1176 | ||
1177 | np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
1178 | sk->sk_allocation); | |
1179 | if (opt->dst0opt && !np->cork.opt->dst0opt) | |
1180 | return -ENOBUFS; | |
1181 | ||
1182 | np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
1183 | sk->sk_allocation); | |
1184 | if (opt->dst1opt && !np->cork.opt->dst1opt) | |
1185 | return -ENOBUFS; | |
1186 | ||
1187 | np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt, | |
1188 | sk->sk_allocation); | |
1189 | if (opt->hopopt && !np->cork.opt->hopopt) | |
1190 | return -ENOBUFS; | |
1191 | ||
1192 | np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
1193 | sk->sk_allocation); | |
1194 | if (opt->srcrt && !np->cork.opt->srcrt) | |
1195 | return -ENOBUFS; | |
1196 | ||
1da177e4 LT |
1197 | /* need source address above miyazawa*/ |
1198 | } | |
d8d1f30b | 1199 | dst_hold(&rt->dst); |
bdc712b4 | 1200 | cork->dst = &rt->dst; |
4c9483b2 | 1201 | inet->cork.fl.u.ip6 = *fl6; |
1da177e4 | 1202 | np->cork.hop_limit = hlimit; |
41a1f8ea | 1203 | np->cork.tclass = tclass; |
0c183379 | 1204 | if (rt->dst.flags & DST_XFRM_TUNNEL) |
93b36cf3 | 1205 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? |
0c183379 G |
1206 | rt->dst.dev->mtu : dst_mtu(&rt->dst); |
1207 | else | |
93b36cf3 | 1208 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? |
0c183379 | 1209 | rt->dst.dev->mtu : dst_mtu(rt->dst.path); |
c7503609 | 1210 | if (np->frag_size < mtu) { |
d91675f9 YH |
1211 | if (np->frag_size) |
1212 | mtu = np->frag_size; | |
1213 | } | |
bdc712b4 | 1214 | cork->fragsize = mtu; |
d8d1f30b | 1215 | if (dst_allfrag(rt->dst.path)) |
bdc712b4 DM |
1216 | cork->flags |= IPCORK_ALLFRAG; |
1217 | cork->length = 0; | |
7efdba5b | 1218 | exthdrlen = (opt ? opt->opt_flen : 0); |
1da177e4 LT |
1219 | length += exthdrlen; |
1220 | transhdrlen += exthdrlen; | |
7efdba5b | 1221 | dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; |
1da177e4 | 1222 | } else { |
bdc712b4 | 1223 | rt = (struct rt6_info *)cork->dst; |
4c9483b2 | 1224 | fl6 = &inet->cork.fl.u.ip6; |
0178b695 | 1225 | opt = np->cork.opt; |
1da177e4 LT |
1226 | transhdrlen = 0; |
1227 | exthdrlen = 0; | |
299b0767 | 1228 | dst_exthdrlen = 0; |
bdc712b4 | 1229 | mtu = cork->fragsize; |
1da177e4 | 1230 | } |
e367c2d0 | 1231 | orig_mtu = mtu; |
1da177e4 | 1232 | |
d8d1f30b | 1233 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4 | 1234 | |
a1b05140 | 1235 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1236 | (opt ? opt->opt_nflen : 0); |
4df98e76 HFS |
1237 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - |
1238 | sizeof(struct frag_hdr); | |
1da177e4 LT |
1239 | |
1240 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
4df98e76 HFS |
1241 | unsigned int maxnonfragsize, headersize; |
1242 | ||
1243 | headersize = sizeof(struct ipv6hdr) + | |
3a1cebe7 | 1244 | (opt ? opt->opt_flen + opt->opt_nflen : 0) + |
4df98e76 HFS |
1245 | (dst_allfrag(&rt->dst) ? |
1246 | sizeof(struct frag_hdr) : 0) + | |
1247 | rt->rt6i_nfheader_len; | |
1248 | ||
60ff7467 | 1249 | if (ip6_sk_ignore_df(sk)) |
0b95227a HFS |
1250 | maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN; |
1251 | else | |
1252 | maxnonfragsize = mtu; | |
4df98e76 HFS |
1253 | |
1254 | /* dontfrag active */ | |
1255 | if ((cork->length + length > mtu - headersize) && dontfrag && | |
1256 | (sk->sk_protocol == IPPROTO_UDP || | |
1257 | sk->sk_protocol == IPPROTO_RAW)) { | |
1258 | ipv6_local_rxpmtu(sk, fl6, mtu - headersize + | |
1259 | sizeof(struct ipv6hdr)); | |
1260 | goto emsgsize; | |
1261 | } | |
1262 | ||
1263 | if (cork->length + length > maxnonfragsize - headersize) { | |
1264 | emsgsize: | |
1265 | ipv6_local_error(sk, EMSGSIZE, fl6, | |
1266 | mtu - headersize + | |
1267 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
1268 | return -EMSGSIZE; |
1269 | } | |
1270 | } | |
1271 | ||
a693e698 | 1272 | /* For UDP, check if TX timestamp is enabled */ |
bf84a010 DB |
1273 | if (sk->sk_type == SOCK_DGRAM) |
1274 | sock_tx_timestamp(sk, &tx_flags); | |
a693e698 | 1275 | |
1da177e4 LT |
1276 | /* |
1277 | * Let's try using as much space as possible. | |
1278 | * Use MTU if total length of the message fits into the MTU. | |
1279 | * Otherwise, we need to reserve fragment header and | |
1280 | * fragment alignment (= 8-15 octects, in total). | |
1281 | * | |
1282 | * Note that we may need to "move" the data from the tail of | |
1ab1457c | 1283 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1284 | * the message. |
1285 | * | |
1ab1457c | 1286 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1287 | * at once if non-fragmentable extension headers |
1288 | * are too large. | |
1ab1457c | 1289 | * --yoshfuji |
1da177e4 LT |
1290 | */ |
1291 | ||
2811ebac HFS |
1292 | skb = skb_peek_tail(&sk->sk_write_queue); |
1293 | cork->length += length; | |
1294 | if (((length > mtu) || | |
1295 | (skb && skb_is_gso(skb))) && | |
1296 | (sk->sk_protocol == IPPROTO_UDP) && | |
1297 | (rt->dst.dev->features & NETIF_F_UFO)) { | |
1298 | err = ip6_ufo_append_data(sk, getfrag, from, length, | |
1299 | hh_len, fragheaderlen, | |
1300 | transhdrlen, mtu, flags, rt); | |
1301 | if (err) | |
1302 | goto error; | |
1303 | return 0; | |
e89e9cf5 | 1304 | } |
1da177e4 | 1305 | |
2811ebac | 1306 | if (!skb) |
1da177e4 LT |
1307 | goto alloc_new_skb; |
1308 | ||
1309 | while (length > 0) { | |
1310 | /* Check if the remaining data fits into current packet. */ | |
bdc712b4 | 1311 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
1da177e4 LT |
1312 | if (copy < length) |
1313 | copy = maxfraglen - skb->len; | |
1314 | ||
1315 | if (copy <= 0) { | |
1316 | char *data; | |
1317 | unsigned int datalen; | |
1318 | unsigned int fraglen; | |
1319 | unsigned int fraggap; | |
1320 | unsigned int alloclen; | |
1da177e4 | 1321 | alloc_new_skb: |
1da177e4 | 1322 | /* There's no room in the current skb */ |
0c183379 G |
1323 | if (skb) |
1324 | fraggap = skb->len - maxfraglen; | |
1da177e4 LT |
1325 | else |
1326 | fraggap = 0; | |
0c183379 G |
1327 | /* update mtu and maxfraglen if necessary */ |
1328 | if (skb == NULL || skb_prev == NULL) | |
1329 | ip6_append_data_mtu(&mtu, &maxfraglen, | |
75a493e6 | 1330 | fragheaderlen, skb, rt, |
e367c2d0 | 1331 | orig_mtu); |
0c183379 G |
1332 | |
1333 | skb_prev = skb; | |
1da177e4 LT |
1334 | |
1335 | /* | |
1336 | * If remaining data exceeds the mtu, | |
1337 | * we know we need more fragment(s). | |
1338 | */ | |
1339 | datalen = length + fraggap; | |
1da177e4 | 1340 | |
0c183379 G |
1341 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
1342 | datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; | |
1da177e4 | 1343 | if ((flags & MSG_MORE) && |
d8d1f30b | 1344 | !(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4 LT |
1345 | alloclen = mtu; |
1346 | else | |
1347 | alloclen = datalen + fragheaderlen; | |
1348 | ||
299b0767 SK |
1349 | alloclen += dst_exthdrlen; |
1350 | ||
0c183379 G |
1351 | if (datalen != length + fraggap) { |
1352 | /* | |
1353 | * this is not the last fragment, the trailer | |
1354 | * space is regarded as data space. | |
1355 | */ | |
1356 | datalen += rt->dst.trailer_len; | |
1357 | } | |
1358 | ||
1359 | alloclen += rt->dst.trailer_len; | |
1360 | fraglen = datalen + fragheaderlen; | |
1da177e4 LT |
1361 | |
1362 | /* | |
1363 | * We just reserve space for fragment header. | |
1ab1457c | 1364 | * Note: this may be overallocation if the message |
1da177e4 LT |
1365 | * (without MSG_MORE) fits into the MTU. |
1366 | */ | |
1367 | alloclen += sizeof(struct frag_hdr); | |
1368 | ||
1369 | if (transhdrlen) { | |
1370 | skb = sock_alloc_send_skb(sk, | |
1371 | alloclen + hh_len, | |
1372 | (flags & MSG_DONTWAIT), &err); | |
1373 | } else { | |
1374 | skb = NULL; | |
1375 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1376 | 2 * sk->sk_sndbuf) | |
1377 | skb = sock_wmalloc(sk, | |
1378 | alloclen + hh_len, 1, | |
1379 | sk->sk_allocation); | |
1380 | if (unlikely(skb == NULL)) | |
1381 | err = -ENOBUFS; | |
a693e698 AB |
1382 | else { |
1383 | /* Only the initial fragment | |
1384 | * is time stamped. | |
1385 | */ | |
1386 | tx_flags = 0; | |
1387 | } | |
1da177e4 LT |
1388 | } |
1389 | if (skb == NULL) | |
1390 | goto error; | |
1391 | /* | |
1392 | * Fill in the control structures | |
1393 | */ | |
9c9c9ad5 | 1394 | skb->protocol = htons(ETH_P_IPV6); |
d7f7c0ac | 1395 | skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 1396 | skb->csum = 0; |
1f85851e G |
1397 | /* reserve for fragmentation and ipsec header */ |
1398 | skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + | |
1399 | dst_exthdrlen); | |
1da177e4 | 1400 | |
a693e698 AB |
1401 | if (sk->sk_type == SOCK_DGRAM) |
1402 | skb_shinfo(skb)->tx_flags = tx_flags; | |
1403 | ||
1da177e4 LT |
1404 | /* |
1405 | * Find where to start putting bytes | |
1406 | */ | |
1f85851e G |
1407 | data = skb_put(skb, fraglen); |
1408 | skb_set_network_header(skb, exthdrlen); | |
1409 | data += fragheaderlen; | |
b0e380b1 ACM |
1410 | skb->transport_header = (skb->network_header + |
1411 | fragheaderlen); | |
1da177e4 LT |
1412 | if (fraggap) { |
1413 | skb->csum = skb_copy_and_csum_bits( | |
1414 | skb_prev, maxfraglen, | |
1415 | data + transhdrlen, fraggap, 0); | |
1416 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1417 | skb->csum); | |
1418 | data += fraggap; | |
e9fa4f7b | 1419 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1420 | } |
1421 | copy = datalen - transhdrlen - fraggap; | |
299b0767 | 1422 | |
1da177e4 LT |
1423 | if (copy < 0) { |
1424 | err = -EINVAL; | |
1425 | kfree_skb(skb); | |
1426 | goto error; | |
1427 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1428 | err = -EFAULT; | |
1429 | kfree_skb(skb); | |
1430 | goto error; | |
1431 | } | |
1432 | ||
1433 | offset += copy; | |
1434 | length -= datalen - fraggap; | |
1435 | transhdrlen = 0; | |
1436 | exthdrlen = 0; | |
299b0767 | 1437 | dst_exthdrlen = 0; |
1da177e4 LT |
1438 | |
1439 | /* | |
1440 | * Put the packet on the pending queue | |
1441 | */ | |
1442 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1443 | continue; | |
1444 | } | |
1445 | ||
1446 | if (copy > length) | |
1447 | copy = length; | |
1448 | ||
d8d1f30b | 1449 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
1da177e4 LT |
1450 | unsigned int off; |
1451 | ||
1452 | off = skb->len; | |
1453 | if (getfrag(from, skb_put(skb, copy), | |
1454 | offset, copy, off, skb) < 0) { | |
1455 | __skb_trim(skb, off); | |
1456 | err = -EFAULT; | |
1457 | goto error; | |
1458 | } | |
1459 | } else { | |
1460 | int i = skb_shinfo(skb)->nr_frags; | |
5640f768 | 1461 | struct page_frag *pfrag = sk_page_frag(sk); |
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 | } | |
a495f836 | 1504 | EXPORT_SYMBOL_GPL(ip6_append_data); |
1da177e4 | 1505 | |
bf138862 PE |
1506 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
1507 | { | |
0178b695 HX |
1508 | if (np->cork.opt) { |
1509 | kfree(np->cork.opt->dst0opt); | |
1510 | kfree(np->cork.opt->dst1opt); | |
1511 | kfree(np->cork.opt->hopopt); | |
1512 | kfree(np->cork.opt->srcrt); | |
1513 | kfree(np->cork.opt); | |
1514 | np->cork.opt = NULL; | |
1515 | } | |
1516 | ||
bdc712b4 DM |
1517 | if (inet->cork.base.dst) { |
1518 | dst_release(inet->cork.base.dst); | |
1519 | inet->cork.base.dst = NULL; | |
1520 | inet->cork.base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 PE |
1521 | } |
1522 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1523 | } | |
1524 | ||
1da177e4 LT |
1525 | int ip6_push_pending_frames(struct sock *sk) |
1526 | { | |
1527 | struct sk_buff *skb, *tmp_skb; | |
1528 | struct sk_buff **tail_skb; | |
1529 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1530 | struct inet_sock *inet = inet_sk(sk); | |
1531 | struct ipv6_pinfo *np = inet6_sk(sk); | |
3bd653c8 | 1532 | struct net *net = sock_net(sk); |
1da177e4 LT |
1533 | struct ipv6hdr *hdr; |
1534 | struct ipv6_txoptions *opt = np->cork.opt; | |
bdc712b4 | 1535 | struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst; |
4c9483b2 DM |
1536 | struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
1537 | unsigned char proto = fl6->flowi6_proto; | |
1da177e4 LT |
1538 | int err = 0; |
1539 | ||
1540 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1541 | goto out; | |
1542 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1543 | ||
1544 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1545 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1546 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1547 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
cfe1fc77 | 1548 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1549 | *tail_skb = tmp_skb; |
1550 | tail_skb = &(tmp_skb->next); | |
1551 | skb->len += tmp_skb->len; | |
1552 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1553 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1554 | tmp_skb->destructor = NULL; |
1555 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1556 | } |
1557 | ||
28a89453 | 1558 | /* Allow local fragmentation. */ |
60ff7467 | 1559 | skb->ignore_df = ip6_sk_ignore_df(sk); |
28a89453 | 1560 | |
4e3fd7a0 | 1561 | *final_dst = fl6->daddr; |
cfe1fc77 | 1562 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1563 | if (opt && opt->opt_flen) |
1564 | ipv6_push_frag_opts(skb, opt, &proto); | |
1565 | if (opt && opt->opt_nflen) | |
1566 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1567 | ||
e2d1bca7 ACM |
1568 | skb_push(skb, sizeof(struct ipv6hdr)); |
1569 | skb_reset_network_header(skb); | |
0660e03f | 1570 | hdr = ipv6_hdr(skb); |
1ab1457c | 1571 | |
3e4e4c1f | 1572 | ip6_flow_hdr(hdr, np->cork.tclass, fl6->flowlabel); |
1da177e4 LT |
1573 | hdr->hop_limit = np->cork.hop_limit; |
1574 | hdr->nexthdr = proto; | |
4e3fd7a0 AD |
1575 | hdr->saddr = fl6->saddr; |
1576 | hdr->daddr = *final_dst; | |
1da177e4 | 1577 | |
a2c2064f | 1578 | skb->priority = sk->sk_priority; |
4a19ec58 | 1579 | skb->mark = sk->sk_mark; |
a2c2064f | 1580 | |
d8d1f30b | 1581 | skb_dst_set(skb, dst_clone(&rt->dst)); |
edf391ff | 1582 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1583 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1584 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1585 | |
43a43b60 HFS |
1586 | ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type); |
1587 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); | |
14878f75 DS |
1588 | } |
1589 | ||
ef76bc23 | 1590 | err = ip6_local_out(skb); |
1da177e4 LT |
1591 | if (err) { |
1592 | if (err > 0) | |
6ce9e7b5 | 1593 | err = net_xmit_errno(err); |
1da177e4 LT |
1594 | if (err) |
1595 | goto error; | |
1596 | } | |
1597 | ||
1598 | out: | |
bf138862 | 1599 | ip6_cork_release(inet, np); |
1da177e4 LT |
1600 | return err; |
1601 | error: | |
06254914 | 1602 | IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1603 | goto out; |
1604 | } | |
a495f836 | 1605 | EXPORT_SYMBOL_GPL(ip6_push_pending_frames); |
1da177e4 LT |
1606 | |
1607 | void ip6_flush_pending_frames(struct sock *sk) | |
1608 | { | |
1da177e4 LT |
1609 | struct sk_buff *skb; |
1610 | ||
1611 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
adf30907 ED |
1612 | if (skb_dst(skb)) |
1613 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1614 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1615 | kfree_skb(skb); |
1616 | } | |
1617 | ||
bf138862 | 1618 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
1da177e4 | 1619 | } |
a495f836 | 1620 | EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); |