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 | |
ad0081e4 | 59 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
1da177e4 | 60 | |
ef76bc23 HX |
61 | int __ip6_local_out(struct sk_buff *skb) |
62 | { | |
63 | int len; | |
64 | ||
65 | len = skb->len - sizeof(struct ipv6hdr); | |
66 | if (len > IPV6_MAXPLEN) | |
67 | len = 0; | |
68 | ipv6_hdr(skb)->payload_len = htons(len); | |
69 | ||
b2e0b385 JE |
70 | return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
71 | skb_dst(skb)->dev, dst_output); | |
ef76bc23 HX |
72 | } |
73 | ||
74 | int ip6_local_out(struct sk_buff *skb) | |
75 | { | |
76 | int err; | |
77 | ||
78 | err = __ip6_local_out(skb); | |
79 | if (likely(err == 1)) | |
80 | err = dst_output(skb); | |
81 | ||
82 | return err; | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(ip6_local_out); | |
85 | ||
1da177e4 LT |
86 | /* dev_loopback_xmit for use with netfilter. */ |
87 | static int ip6_dev_loopback_xmit(struct sk_buff *newskb) | |
88 | { | |
459a98ed | 89 | skb_reset_mac_header(newskb); |
bbe735e4 | 90 | __skb_pull(newskb, skb_network_offset(newskb)); |
1da177e4 LT |
91 | newskb->pkt_type = PACKET_LOOPBACK; |
92 | newskb->ip_summed = CHECKSUM_UNNECESSARY; | |
adf30907 | 93 | WARN_ON(!skb_dst(newskb)); |
1da177e4 | 94 | |
e30b38c2 | 95 | netif_rx_ni(newskb); |
1da177e4 LT |
96 | return 0; |
97 | } | |
98 | ||
9e508490 | 99 | static int ip6_finish_output2(struct sk_buff *skb) |
1da177e4 | 100 | { |
adf30907 | 101 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 102 | struct net_device *dev = dst->dev; |
f6b72b62 | 103 | struct neighbour *neigh; |
1da177e4 LT |
104 | |
105 | skb->protocol = htons(ETH_P_IPV6); | |
106 | skb->dev = dev; | |
107 | ||
0660e03f | 108 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
adf30907 | 109 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
1da177e4 | 110 | |
7ad6848c | 111 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) && |
d1db275d | 112 | ((mroute6_socket(dev_net(dev), skb) && |
bd91b8bf | 113 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
7bc570c8 YH |
114 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
115 | &ipv6_hdr(skb)->saddr))) { | |
1da177e4 LT |
116 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
117 | ||
118 | /* Do not check for IFF_ALLMULTI; multicast routing | |
119 | is not supported in any case. | |
120 | */ | |
121 | if (newskb) | |
b2e0b385 JE |
122 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
123 | newskb, NULL, newskb->dev, | |
1da177e4 LT |
124 | ip6_dev_loopback_xmit); |
125 | ||
0660e03f | 126 | if (ipv6_hdr(skb)->hop_limit == 0) { |
3bd653c8 DL |
127 | IP6_INC_STATS(dev_net(dev), idev, |
128 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
129 | kfree_skb(skb); |
130 | return 0; | |
131 | } | |
132 | } | |
133 | ||
edf391ff NH |
134 | IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST, |
135 | skb->len); | |
1da177e4 LT |
136 | } |
137 | ||
f2c31e32 | 138 | rcu_read_lock(); |
27217455 | 139 | neigh = dst_get_neighbour_noref(dst); |
f2c31e32 ED |
140 | if (neigh) { |
141 | int res = neigh_output(neigh, skb); | |
05e3aa09 | 142 | |
f2c31e32 ED |
143 | rcu_read_unlock(); |
144 | return res; | |
145 | } | |
146 | rcu_read_unlock(); | |
9e508490 JE |
147 | IP6_INC_STATS_BH(dev_net(dst->dev), |
148 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
149 | kfree_skb(skb); | |
150 | return -EINVAL; | |
1da177e4 LT |
151 | } |
152 | ||
9e508490 JE |
153 | static int ip6_finish_output(struct sk_buff *skb) |
154 | { | |
155 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || | |
156 | dst_allfrag(skb_dst(skb))) | |
157 | return ip6_fragment(skb, ip6_finish_output2); | |
158 | else | |
159 | return ip6_finish_output2(skb); | |
160 | } | |
161 | ||
1da177e4 LT |
162 | int ip6_output(struct sk_buff *skb) |
163 | { | |
9e508490 | 164 | struct net_device *dev = skb_dst(skb)->dev; |
adf30907 | 165 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
778d80be | 166 | if (unlikely(idev->cnf.disable_ipv6)) { |
9e508490 | 167 | IP6_INC_STATS(dev_net(dev), idev, |
3bd653c8 | 168 | IPSTATS_MIB_OUTDISCARDS); |
778d80be YH |
169 | kfree_skb(skb); |
170 | return 0; | |
171 | } | |
172 | ||
9c6eb28a JE |
173 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev, |
174 | ip6_finish_output, | |
175 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1da177e4 LT |
176 | } |
177 | ||
1da177e4 | 178 | /* |
b5d43998 | 179 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
1da177e4 LT |
180 | */ |
181 | ||
4c9483b2 | 182 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
b903d324 | 183 | struct ipv6_txoptions *opt, int tclass) |
1da177e4 | 184 | { |
3bd653c8 | 185 | struct net *net = sock_net(sk); |
b30bd282 | 186 | struct ipv6_pinfo *np = inet6_sk(sk); |
4c9483b2 | 187 | struct in6_addr *first_hop = &fl6->daddr; |
adf30907 | 188 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 189 | struct ipv6hdr *hdr; |
4c9483b2 | 190 | u8 proto = fl6->flowi6_proto; |
1da177e4 | 191 | int seg_len = skb->len; |
e651f03a | 192 | int hlimit = -1; |
1da177e4 LT |
193 | u32 mtu; |
194 | ||
195 | if (opt) { | |
c2636b4d | 196 | unsigned int head_room; |
1da177e4 LT |
197 | |
198 | /* First: exthdrs may take lots of space (~8K for now) | |
199 | MAX_HEADER is not enough. | |
200 | */ | |
201 | head_room = opt->opt_nflen + opt->opt_flen; | |
202 | seg_len += head_room; | |
203 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
204 | ||
205 | if (skb_headroom(skb) < head_room) { | |
206 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
a11d206d | 207 | if (skb2 == NULL) { |
adf30907 | 208 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
209 | IPSTATS_MIB_OUTDISCARDS); |
210 | kfree_skb(skb); | |
1da177e4 LT |
211 | return -ENOBUFS; |
212 | } | |
a11d206d YH |
213 | kfree_skb(skb); |
214 | skb = skb2; | |
83d7eb29 | 215 | skb_set_owner_w(skb, sk); |
1da177e4 LT |
216 | } |
217 | if (opt->opt_flen) | |
218 | ipv6_push_frag_opts(skb, opt, &proto); | |
219 | if (opt->opt_nflen) | |
220 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
221 | } | |
222 | ||
e2d1bca7 ACM |
223 | skb_push(skb, sizeof(struct ipv6hdr)); |
224 | skb_reset_network_header(skb); | |
0660e03f | 225 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
226 | |
227 | /* | |
228 | * Fill in the IPv6 header | |
229 | */ | |
b903d324 | 230 | if (np) |
1da177e4 LT |
231 | hlimit = np->hop_limit; |
232 | if (hlimit < 0) | |
6b75d090 | 233 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 234 | |
4c9483b2 | 235 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl6->flowlabel; |
41a1f8ea | 236 | |
1da177e4 LT |
237 | hdr->payload_len = htons(seg_len); |
238 | hdr->nexthdr = proto; | |
239 | hdr->hop_limit = hlimit; | |
240 | ||
4e3fd7a0 AD |
241 | hdr->saddr = fl6->saddr; |
242 | hdr->daddr = *first_hop; | |
1da177e4 | 243 | |
a2c2064f | 244 | skb->priority = sk->sk_priority; |
4a19ec58 | 245 | skb->mark = sk->sk_mark; |
a2c2064f | 246 | |
1da177e4 | 247 | mtu = dst_mtu(dst); |
283d07ac | 248 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
adf30907 | 249 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 250 | IPSTATS_MIB_OUT, skb->len); |
b2e0b385 JE |
251 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
252 | dst->dev, dst_output); | |
1da177e4 LT |
253 | } |
254 | ||
255 | if (net_ratelimit()) | |
256 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); | |
257 | skb->dev = dst->dev; | |
3ffe533c | 258 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 259 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
260 | kfree_skb(skb); |
261 | return -EMSGSIZE; | |
262 | } | |
263 | ||
7159039a YH |
264 | EXPORT_SYMBOL(ip6_xmit); |
265 | ||
1da177e4 LT |
266 | /* |
267 | * To avoid extra problems ND packets are send through this | |
268 | * routine. It's code duplication but I really want to avoid | |
269 | * extra checks since ipv6_build_header is used by TCP (which | |
270 | * is for us performance critical) | |
271 | */ | |
272 | ||
273 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, | |
9acd9f3a | 274 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
1da177e4 LT |
275 | int proto, int len) |
276 | { | |
277 | struct ipv6_pinfo *np = inet6_sk(sk); | |
278 | struct ipv6hdr *hdr; | |
1da177e4 LT |
279 | |
280 | skb->protocol = htons(ETH_P_IPV6); | |
281 | skb->dev = dev; | |
282 | ||
55f79cc0 ACM |
283 | skb_reset_network_header(skb); |
284 | skb_put(skb, sizeof(struct ipv6hdr)); | |
0660e03f | 285 | hdr = ipv6_hdr(skb); |
1da177e4 | 286 | |
ae08e1f0 | 287 | *(__be32*)hdr = htonl(0x60000000); |
1da177e4 LT |
288 | |
289 | hdr->payload_len = htons(len); | |
290 | hdr->nexthdr = proto; | |
291 | hdr->hop_limit = np->hop_limit; | |
292 | ||
4e3fd7a0 AD |
293 | hdr->saddr = *saddr; |
294 | hdr->daddr = *daddr; | |
1da177e4 LT |
295 | |
296 | return 0; | |
297 | } | |
298 | ||
299 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
300 | { | |
301 | struct ip6_ra_chain *ra; | |
302 | struct sock *last = NULL; | |
303 | ||
304 | read_lock(&ip6_ra_lock); | |
305 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
306 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
307 | if (sk && ra->sel == sel && |
308 | (!sk->sk_bound_dev_if || | |
309 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
310 | if (last) { |
311 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
312 | if (skb2) | |
313 | rawv6_rcv(last, skb2); | |
314 | } | |
315 | last = sk; | |
316 | } | |
317 | } | |
318 | ||
319 | if (last) { | |
320 | rawv6_rcv(last, skb); | |
321 | read_unlock(&ip6_ra_lock); | |
322 | return 1; | |
323 | } | |
324 | read_unlock(&ip6_ra_lock); | |
325 | return 0; | |
326 | } | |
327 | ||
e21e0b5f VN |
328 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
329 | { | |
0660e03f | 330 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f | 331 | u8 nexthdr = hdr->nexthdr; |
75f2811c | 332 | __be16 frag_off; |
e21e0b5f VN |
333 | int offset; |
334 | ||
335 | if (ipv6_ext_hdr(nexthdr)) { | |
75f2811c | 336 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); |
e21e0b5f VN |
337 | if (offset < 0) |
338 | return 0; | |
339 | } else | |
340 | offset = sizeof(struct ipv6hdr); | |
341 | ||
342 | if (nexthdr == IPPROTO_ICMPV6) { | |
343 | struct icmp6hdr *icmp6; | |
344 | ||
d56f90a7 ACM |
345 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
346 | offset + 1 - skb->data))) | |
e21e0b5f VN |
347 | return 0; |
348 | ||
d56f90a7 | 349 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
350 | |
351 | switch (icmp6->icmp6_type) { | |
352 | case NDISC_ROUTER_SOLICITATION: | |
353 | case NDISC_ROUTER_ADVERTISEMENT: | |
354 | case NDISC_NEIGHBOUR_SOLICITATION: | |
355 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
356 | case NDISC_REDIRECT: | |
357 | /* For reaction involving unicast neighbor discovery | |
358 | * message destined to the proxied address, pass it to | |
359 | * input function. | |
360 | */ | |
361 | return 1; | |
362 | default: | |
363 | break; | |
364 | } | |
365 | } | |
366 | ||
74553b09 VN |
367 | /* |
368 | * The proxying router can't forward traffic sent to a link-local | |
369 | * address, so signal the sender and discard the packet. This | |
370 | * behavior is clarified by the MIPv6 specification. | |
371 | */ | |
372 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
373 | dst_link_failure(skb); | |
374 | return -1; | |
375 | } | |
376 | ||
e21e0b5f VN |
377 | return 0; |
378 | } | |
379 | ||
1da177e4 LT |
380 | static inline int ip6_forward_finish(struct sk_buff *skb) |
381 | { | |
382 | return dst_output(skb); | |
383 | } | |
384 | ||
385 | int ip6_forward(struct sk_buff *skb) | |
386 | { | |
adf30907 | 387 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 388 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 389 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 390 | struct net *net = dev_net(dst->dev); |
14f3ad6f | 391 | u32 mtu; |
1ab1457c | 392 | |
53b7997f | 393 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
394 | goto error; |
395 | ||
4497b076 BH |
396 | if (skb_warn_if_lro(skb)) |
397 | goto drop; | |
398 | ||
1da177e4 | 399 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
3bd653c8 | 400 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
401 | goto drop; |
402 | } | |
403 | ||
72b43d08 AK |
404 | if (skb->pkt_type != PACKET_HOST) |
405 | goto drop; | |
406 | ||
35fc92a9 | 407 | skb_forward_csum(skb); |
1da177e4 LT |
408 | |
409 | /* | |
410 | * We DO NOT make any processing on | |
411 | * RA packets, pushing them to user level AS IS | |
412 | * without ane WARRANTY that application will be able | |
413 | * to interpret them. The reason is that we | |
414 | * cannot make anything clever here. | |
415 | * | |
416 | * We are not end-node, so that if packet contains | |
417 | * AH/ESP, we cannot make anything. | |
418 | * Defragmentation also would be mistake, RA packets | |
419 | * cannot be fragmented, because there is no warranty | |
420 | * that different fragments will go along one path. --ANK | |
421 | */ | |
422 | if (opt->ra) { | |
d56f90a7 | 423 | u8 *ptr = skb_network_header(skb) + opt->ra; |
1da177e4 LT |
424 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
425 | return 0; | |
426 | } | |
427 | ||
428 | /* | |
429 | * check and decrement ttl | |
430 | */ | |
431 | if (hdr->hop_limit <= 1) { | |
432 | /* Force OUTPUT device used as source address */ | |
433 | skb->dev = dst->dev; | |
3ffe533c | 434 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
483a47d2 DL |
435 | IP6_INC_STATS_BH(net, |
436 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
437 | |
438 | kfree_skb(skb); | |
439 | return -ETIMEDOUT; | |
440 | } | |
441 | ||
fbea49e1 | 442 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 443 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 444 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
445 | int proxied = ip6_forward_proxy_check(skb); |
446 | if (proxied > 0) | |
e21e0b5f | 447 | return ip6_input(skb); |
74553b09 | 448 | else if (proxied < 0) { |
3bd653c8 DL |
449 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
450 | IPSTATS_MIB_INDISCARDS); | |
74553b09 VN |
451 | goto drop; |
452 | } | |
e21e0b5f VN |
453 | } |
454 | ||
1da177e4 | 455 | if (!xfrm6_route_forward(skb)) { |
3bd653c8 | 456 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
457 | goto drop; |
458 | } | |
adf30907 | 459 | dst = skb_dst(skb); |
1da177e4 LT |
460 | |
461 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
462 | send redirects to source routed frames. | |
1e5dc146 | 463 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 464 | */ |
c45a3dfb | 465 | if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) { |
1da177e4 LT |
466 | struct in6_addr *target = NULL; |
467 | struct rt6_info *rt; | |
1da177e4 LT |
468 | |
469 | /* | |
470 | * incoming and outgoing devices are the same | |
471 | * send a redirect. | |
472 | */ | |
473 | ||
474 | rt = (struct rt6_info *) dst; | |
c45a3dfb DM |
475 | if (rt->rt6i_flags & RTF_GATEWAY) |
476 | target = &rt->rt6i_gateway; | |
1da177e4 LT |
477 | else |
478 | target = &hdr->daddr; | |
479 | ||
92d86829 DM |
480 | if (!rt->rt6i_peer) |
481 | rt6_bind_peer(rt, 1); | |
482 | ||
1da177e4 LT |
483 | /* Limit redirects both by destination (here) |
484 | and by source (inside ndisc_send_redirect) | |
485 | */ | |
92d86829 | 486 | if (inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ)) |
4991969a | 487 | ndisc_send_redirect(skb, target); |
5bb1ab09 DS |
488 | } else { |
489 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
490 | ||
1da177e4 | 491 | /* This check is security critical. */ |
f81b2e7d YH |
492 | if (addrtype == IPV6_ADDR_ANY || |
493 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
494 | goto error; |
495 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
496 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3ffe533c | 497 | ICMPV6_NOT_NEIGHBOUR, 0); |
5bb1ab09 DS |
498 | goto error; |
499 | } | |
1da177e4 LT |
500 | } |
501 | ||
14f3ad6f UW |
502 | mtu = dst_mtu(dst); |
503 | if (mtu < IPV6_MIN_MTU) | |
504 | mtu = IPV6_MIN_MTU; | |
505 | ||
0aa68271 | 506 | if (skb->len > mtu && !skb_is_gso(skb)) { |
1da177e4 LT |
507 | /* Again, force OUTPUT device used as source address */ |
508 | skb->dev = dst->dev; | |
14f3ad6f | 509 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
483a47d2 DL |
510 | IP6_INC_STATS_BH(net, |
511 | ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); | |
512 | IP6_INC_STATS_BH(net, | |
513 | ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
514 | kfree_skb(skb); |
515 | return -EMSGSIZE; | |
516 | } | |
517 | ||
518 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
3bd653c8 | 519 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
520 | goto drop; |
521 | } | |
522 | ||
0660e03f | 523 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
524 | |
525 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 526 | |
1da177e4 LT |
527 | hdr->hop_limit--; |
528 | ||
483a47d2 | 529 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
b2e0b385 | 530 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
6e23ae2a | 531 | ip6_forward_finish); |
1da177e4 LT |
532 | |
533 | error: | |
483a47d2 | 534 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
535 | drop: |
536 | kfree_skb(skb); | |
537 | return -EINVAL; | |
538 | } | |
539 | ||
540 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
541 | { | |
542 | to->pkt_type = from->pkt_type; | |
543 | to->priority = from->priority; | |
544 | to->protocol = from->protocol; | |
adf30907 ED |
545 | skb_dst_drop(to); |
546 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 547 | to->dev = from->dev; |
82e91ffe | 548 | to->mark = from->mark; |
1da177e4 LT |
549 | |
550 | #ifdef CONFIG_NET_SCHED | |
551 | to->tc_index = from->tc_index; | |
552 | #endif | |
e7ac05f3 | 553 | nf_copy(to, from); |
ba9dda3a JK |
554 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
555 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
556 | to->nf_trace = from->nf_trace; | |
557 | #endif | |
984bc16c | 558 | skb_copy_secmark(to, from); |
1da177e4 LT |
559 | } |
560 | ||
561 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
562 | { | |
563 | u16 offset = sizeof(struct ipv6hdr); | |
0660e03f ACM |
564 | struct ipv6_opt_hdr *exthdr = |
565 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
27a884dc | 566 | unsigned int packet_len = skb->tail - skb->network_header; |
1da177e4 | 567 | int found_rhdr = 0; |
0660e03f | 568 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
1da177e4 LT |
569 | |
570 | while (offset + 1 <= packet_len) { | |
571 | ||
572 | switch (**nexthdr) { | |
573 | ||
574 | case NEXTHDR_HOP: | |
27637df9 | 575 | break; |
1da177e4 | 576 | case NEXTHDR_ROUTING: |
27637df9 MN |
577 | found_rhdr = 1; |
578 | break; | |
1da177e4 | 579 | case NEXTHDR_DEST: |
59fbb3a6 | 580 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
581 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
582 | break; | |
583 | #endif | |
584 | if (found_rhdr) | |
585 | return offset; | |
1da177e4 LT |
586 | break; |
587 | default : | |
588 | return offset; | |
589 | } | |
27637df9 MN |
590 | |
591 | offset += ipv6_optlen(exthdr); | |
592 | *nexthdr = &exthdr->nexthdr; | |
d56f90a7 ACM |
593 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
594 | offset); | |
1da177e4 LT |
595 | } |
596 | ||
597 | return offset; | |
598 | } | |
599 | ||
87c48fa3 ED |
600 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) |
601 | { | |
602 | static atomic_t ipv6_fragmentation_id; | |
603 | int old, new; | |
604 | ||
e688a604 | 605 | if (rt && !(rt->dst.flags & DST_NOPEER)) { |
87c48fa3 ED |
606 | struct inet_peer *peer; |
607 | ||
608 | if (!rt->rt6i_peer) | |
609 | rt6_bind_peer(rt, 1); | |
610 | peer = rt->rt6i_peer; | |
611 | if (peer) { | |
612 | fhdr->identification = htonl(inet_getid(peer, 0)); | |
613 | return; | |
614 | } | |
615 | } | |
616 | do { | |
617 | old = atomic_read(&ipv6_fragmentation_id); | |
618 | new = old + 1; | |
619 | if (!new) | |
620 | new = 1; | |
621 | } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old); | |
622 | fhdr->identification = htonl(new); | |
623 | } | |
624 | ||
ad0081e4 | 625 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
1da177e4 | 626 | { |
1da177e4 | 627 | struct sk_buff *frag; |
adf30907 | 628 | struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); |
d91675f9 | 629 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
630 | struct ipv6hdr *tmp_hdr; |
631 | struct frag_hdr *fh; | |
632 | unsigned int mtu, hlen, left, len; | |
a7ae1992 | 633 | int hroom, troom; |
ae08e1f0 | 634 | __be32 frag_id = 0; |
1da177e4 LT |
635 | int ptr, offset = 0, err=0; |
636 | u8 *prevhdr, nexthdr = 0; | |
adf30907 | 637 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 638 | |
1da177e4 LT |
639 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
640 | nexthdr = *prevhdr; | |
641 | ||
628a5c56 | 642 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
643 | |
644 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 645 | * or if the skb it not generated by a local socket. |
b881ef76 | 646 | */ |
f2228f78 | 647 | if (!skb->local_df && skb->len > mtu) { |
adf30907 | 648 | skb->dev = skb_dst(skb)->dev; |
3ffe533c | 649 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 650 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 651 | IPSTATS_MIB_FRAGFAILS); |
b881ef76 JH |
652 | kfree_skb(skb); |
653 | return -EMSGSIZE; | |
654 | } | |
655 | ||
d91675f9 YH |
656 | if (np && np->frag_size < mtu) { |
657 | if (np->frag_size) | |
658 | mtu = np->frag_size; | |
659 | } | |
660 | mtu -= hlen + sizeof(struct frag_hdr); | |
1da177e4 | 661 | |
21dc3301 | 662 | if (skb_has_frag_list(skb)) { |
1da177e4 | 663 | int first_len = skb_pagelen(skb); |
3d13008e | 664 | struct sk_buff *frag2; |
1da177e4 LT |
665 | |
666 | if (first_len - hlen > mtu || | |
667 | ((first_len - hlen) & 7) || | |
668 | skb_cloned(skb)) | |
669 | goto slow_path; | |
670 | ||
4d9092bb | 671 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
672 | /* Correct geometry. */ |
673 | if (frag->len > mtu || | |
674 | ((frag->len & 7) && frag->next) || | |
675 | skb_headroom(frag) < hlen) | |
3d13008e | 676 | goto slow_path_clean; |
1da177e4 | 677 | |
1da177e4 LT |
678 | /* Partially cloned skb? */ |
679 | if (skb_shared(frag)) | |
3d13008e | 680 | goto slow_path_clean; |
2fdba6b0 HX |
681 | |
682 | BUG_ON(frag->sk); | |
683 | if (skb->sk) { | |
2fdba6b0 HX |
684 | frag->sk = skb->sk; |
685 | frag->destructor = sock_wfree; | |
2fdba6b0 | 686 | } |
3d13008e | 687 | skb->truesize -= frag->truesize; |
1da177e4 LT |
688 | } |
689 | ||
690 | err = 0; | |
691 | offset = 0; | |
692 | frag = skb_shinfo(skb)->frag_list; | |
4d9092bb | 693 | skb_frag_list_init(skb); |
1da177e4 LT |
694 | /* BUILD HEADER */ |
695 | ||
9a217a1c | 696 | *prevhdr = NEXTHDR_FRAGMENT; |
d56f90a7 | 697 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
1da177e4 | 698 | if (!tmp_hdr) { |
adf30907 | 699 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 700 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
701 | return -ENOMEM; |
702 | } | |
703 | ||
1da177e4 LT |
704 | __skb_pull(skb, hlen); |
705 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
e2d1bca7 ACM |
706 | __skb_push(skb, hlen); |
707 | skb_reset_network_header(skb); | |
d56f90a7 | 708 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
1da177e4 | 709 | |
87c48fa3 | 710 | ipv6_select_ident(fh, rt); |
1da177e4 LT |
711 | fh->nexthdr = nexthdr; |
712 | fh->reserved = 0; | |
713 | fh->frag_off = htons(IP6_MF); | |
714 | frag_id = fh->identification; | |
715 | ||
716 | first_len = skb_pagelen(skb); | |
717 | skb->data_len = first_len - skb_headlen(skb); | |
718 | skb->len = first_len; | |
0660e03f ACM |
719 | ipv6_hdr(skb)->payload_len = htons(first_len - |
720 | sizeof(struct ipv6hdr)); | |
a11d206d | 721 | |
d8d1f30b | 722 | dst_hold(&rt->dst); |
1da177e4 LT |
723 | |
724 | for (;;) { | |
725 | /* Prepare header of the next frame, | |
726 | * before previous one went down. */ | |
727 | if (frag) { | |
728 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 729 | skb_reset_transport_header(frag); |
1da177e4 | 730 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
731 | __skb_push(frag, hlen); |
732 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
733 | memcpy(skb_network_header(frag), tmp_hdr, |
734 | hlen); | |
1da177e4 LT |
735 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
736 | fh->nexthdr = nexthdr; | |
737 | fh->reserved = 0; | |
738 | fh->frag_off = htons(offset); | |
739 | if (frag->next != NULL) | |
740 | fh->frag_off |= htons(IP6_MF); | |
741 | fh->identification = frag_id; | |
0660e03f ACM |
742 | ipv6_hdr(frag)->payload_len = |
743 | htons(frag->len - | |
744 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
745 | ip6_copy_metadata(frag, skb); |
746 | } | |
1ab1457c | 747 | |
1da177e4 | 748 | err = output(skb); |
dafee490 | 749 | if(!err) |
d8d1f30b | 750 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 751 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 752 | |
1da177e4 LT |
753 | if (err || !frag) |
754 | break; | |
755 | ||
756 | skb = frag; | |
757 | frag = skb->next; | |
758 | skb->next = NULL; | |
759 | } | |
760 | ||
a51482bd | 761 | kfree(tmp_hdr); |
1da177e4 LT |
762 | |
763 | if (err == 0) { | |
d8d1f30b | 764 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 765 | IPSTATS_MIB_FRAGOKS); |
d8d1f30b | 766 | dst_release(&rt->dst); |
1da177e4 LT |
767 | return 0; |
768 | } | |
769 | ||
770 | while (frag) { | |
771 | skb = frag->next; | |
772 | kfree_skb(frag); | |
773 | frag = skb; | |
774 | } | |
775 | ||
d8d1f30b | 776 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 777 | IPSTATS_MIB_FRAGFAILS); |
d8d1f30b | 778 | dst_release(&rt->dst); |
1da177e4 | 779 | return err; |
3d13008e ED |
780 | |
781 | slow_path_clean: | |
782 | skb_walk_frags(skb, frag2) { | |
783 | if (frag2 == frag) | |
784 | break; | |
785 | frag2->sk = NULL; | |
786 | frag2->destructor = NULL; | |
787 | skb->truesize += frag2->truesize; | |
788 | } | |
1da177e4 LT |
789 | } |
790 | ||
791 | slow_path: | |
792 | left = skb->len - hlen; /* Space per frame */ | |
793 | ptr = hlen; /* Where to start from */ | |
794 | ||
795 | /* | |
796 | * Fragment the datagram. | |
797 | */ | |
798 | ||
799 | *prevhdr = NEXTHDR_FRAGMENT; | |
a7ae1992 HX |
800 | hroom = LL_RESERVED_SPACE(rt->dst.dev); |
801 | troom = rt->dst.dev->needed_tailroom; | |
1da177e4 LT |
802 | |
803 | /* | |
804 | * Keep copying data until we run out. | |
805 | */ | |
806 | while(left > 0) { | |
807 | len = left; | |
808 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
809 | if (len > mtu) | |
810 | len = mtu; | |
25985edc | 811 | /* IF: we are not sending up to and including the packet end |
1da177e4 LT |
812 | then align the next start on an eight byte boundary */ |
813 | if (len < left) { | |
814 | len &= ~7; | |
815 | } | |
816 | /* | |
817 | * Allocate buffer. | |
818 | */ | |
819 | ||
a7ae1992 HX |
820 | if ((frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) + |
821 | hroom + troom, GFP_ATOMIC)) == NULL) { | |
64ce2073 | 822 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
adf30907 | 823 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 824 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
825 | err = -ENOMEM; |
826 | goto fail; | |
827 | } | |
828 | ||
829 | /* | |
830 | * Set up data on packet | |
831 | */ | |
832 | ||
833 | ip6_copy_metadata(frag, skb); | |
a7ae1992 | 834 | skb_reserve(frag, hroom); |
1da177e4 | 835 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
c1d2bbe1 | 836 | skb_reset_network_header(frag); |
badff6d0 | 837 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
b0e380b1 ACM |
838 | frag->transport_header = (frag->network_header + hlen + |
839 | sizeof(struct frag_hdr)); | |
1da177e4 LT |
840 | |
841 | /* | |
842 | * Charge the memory for the fragment to any owner | |
843 | * it might possess | |
844 | */ | |
845 | if (skb->sk) | |
846 | skb_set_owner_w(frag, skb->sk); | |
847 | ||
848 | /* | |
849 | * Copy the packet header into the new buffer. | |
850 | */ | |
d626f62b | 851 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
1da177e4 LT |
852 | |
853 | /* | |
854 | * Build fragment header. | |
855 | */ | |
856 | fh->nexthdr = nexthdr; | |
857 | fh->reserved = 0; | |
f36d6ab1 | 858 | if (!frag_id) { |
87c48fa3 | 859 | ipv6_select_ident(fh, rt); |
1da177e4 LT |
860 | frag_id = fh->identification; |
861 | } else | |
862 | fh->identification = frag_id; | |
863 | ||
864 | /* | |
865 | * Copy a block of the IP datagram. | |
866 | */ | |
8984e41d | 867 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
1da177e4 LT |
868 | BUG(); |
869 | left -= len; | |
870 | ||
871 | fh->frag_off = htons(offset); | |
872 | if (left > 0) | |
873 | fh->frag_off |= htons(IP6_MF); | |
0660e03f ACM |
874 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
875 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
876 | |
877 | ptr += len; | |
878 | offset += len; | |
879 | ||
880 | /* | |
881 | * Put this fragment into the sending queue. | |
882 | */ | |
1da177e4 LT |
883 | err = output(frag); |
884 | if (err) | |
885 | goto fail; | |
dafee490 | 886 | |
adf30907 | 887 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 888 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 889 | } |
adf30907 | 890 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 891 | IPSTATS_MIB_FRAGOKS); |
1da177e4 | 892 | kfree_skb(skb); |
1da177e4 LT |
893 | return err; |
894 | ||
895 | fail: | |
adf30907 | 896 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 897 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 898 | kfree_skb(skb); |
1da177e4 LT |
899 | return err; |
900 | } | |
901 | ||
b71d1d42 ED |
902 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
903 | const struct in6_addr *fl_addr, | |
904 | const struct in6_addr *addr_cache) | |
cf6b1982 | 905 | { |
a02cec21 ED |
906 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
907 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)); | |
cf6b1982 YH |
908 | } |
909 | ||
497c615a HX |
910 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
911 | struct dst_entry *dst, | |
b71d1d42 | 912 | const struct flowi6 *fl6) |
1da177e4 | 913 | { |
497c615a HX |
914 | struct ipv6_pinfo *np = inet6_sk(sk); |
915 | struct rt6_info *rt = (struct rt6_info *)dst; | |
1da177e4 | 916 | |
497c615a HX |
917 | if (!dst) |
918 | goto out; | |
919 | ||
920 | /* Yes, checking route validity in not connected | |
921 | * case is not very simple. Take into account, | |
922 | * that we do not support routing by source, TOS, | |
923 | * and MSG_DONTROUTE --ANK (980726) | |
924 | * | |
cf6b1982 YH |
925 | * 1. ip6_rt_check(): If route was host route, |
926 | * check that cached destination is current. | |
497c615a HX |
927 | * If it is network route, we still may |
928 | * check its validity using saved pointer | |
929 | * to the last used address: daddr_cache. | |
930 | * We do not want to save whole address now, | |
931 | * (because main consumer of this service | |
932 | * is tcp, which has not this problem), | |
933 | * so that the last trick works only on connected | |
934 | * sockets. | |
935 | * 2. oif also should be the same. | |
936 | */ | |
4c9483b2 | 937 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
8e1ef0a9 | 938 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 939 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
8e1ef0a9 | 940 | #endif |
4c9483b2 | 941 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) { |
497c615a HX |
942 | dst_release(dst); |
943 | dst = NULL; | |
1da177e4 LT |
944 | } |
945 | ||
497c615a HX |
946 | out: |
947 | return dst; | |
948 | } | |
949 | ||
950 | static int ip6_dst_lookup_tail(struct sock *sk, | |
4c9483b2 | 951 | struct dst_entry **dst, struct flowi6 *fl6) |
497c615a | 952 | { |
3b1e0a65 | 953 | struct net *net = sock_net(sk); |
69cce1d1 DM |
954 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
955 | struct neighbour *n; | |
956 | #endif | |
957 | int err; | |
497c615a | 958 | |
1da177e4 | 959 | if (*dst == NULL) |
4c9483b2 | 960 | *dst = ip6_route_output(net, sk, fl6); |
1da177e4 LT |
961 | |
962 | if ((err = (*dst)->error)) | |
963 | goto out_err_release; | |
964 | ||
4c9483b2 | 965 | if (ipv6_addr_any(&fl6->saddr)) { |
c3968a85 DW |
966 | struct rt6_info *rt = (struct rt6_info *) *dst; |
967 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
968 | sk ? inet6_sk(sk)->srcprefs : 0, | |
969 | &fl6->saddr); | |
44456d37 | 970 | if (err) |
1da177e4 | 971 | goto out_err_release; |
1da177e4 LT |
972 | } |
973 | ||
95c385b4 | 974 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
975 | /* |
976 | * Here if the dst entry we've looked up | |
977 | * has a neighbour entry that is in the INCOMPLETE | |
978 | * state and the src address from the flow is | |
979 | * marked as OPTIMISTIC, we release the found | |
980 | * dst entry and replace it instead with the | |
981 | * dst entry of the nexthop router | |
982 | */ | |
f2c31e32 | 983 | rcu_read_lock(); |
27217455 | 984 | n = dst_get_neighbour_noref(*dst); |
69cce1d1 | 985 | if (n && !(n->nud_state & NUD_VALID)) { |
e550dfb0 | 986 | struct inet6_ifaddr *ifp; |
4c9483b2 | 987 | struct flowi6 fl_gw6; |
e550dfb0 NH |
988 | int redirect; |
989 | ||
f2c31e32 | 990 | rcu_read_unlock(); |
4c9483b2 | 991 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
e550dfb0 NH |
992 | (*dst)->dev, 1); |
993 | ||
994 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
995 | if (ifp) | |
996 | in6_ifa_put(ifp); | |
997 | ||
998 | if (redirect) { | |
999 | /* | |
1000 | * We need to get the dst entry for the | |
1001 | * default router instead | |
1002 | */ | |
1003 | dst_release(*dst); | |
4c9483b2 DM |
1004 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
1005 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
1006 | *dst = ip6_route_output(net, sk, &fl_gw6); | |
e550dfb0 NH |
1007 | if ((err = (*dst)->error)) |
1008 | goto out_err_release; | |
95c385b4 | 1009 | } |
f2c31e32 ED |
1010 | } else { |
1011 | rcu_read_unlock(); | |
e550dfb0 | 1012 | } |
95c385b4 NH |
1013 | #endif |
1014 | ||
1da177e4 LT |
1015 | return 0; |
1016 | ||
1017 | out_err_release: | |
ca46f9c8 | 1018 | if (err == -ENETUNREACH) |
483a47d2 | 1019 | IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1020 | dst_release(*dst); |
1021 | *dst = NULL; | |
1022 | return err; | |
1023 | } | |
34a0b3cd | 1024 | |
497c615a HX |
1025 | /** |
1026 | * ip6_dst_lookup - perform route lookup on flow | |
1027 | * @sk: socket which provides route info | |
1028 | * @dst: pointer to dst_entry * for result | |
4c9483b2 | 1029 | * @fl6: flow to lookup |
497c615a HX |
1030 | * |
1031 | * This function performs a route lookup on the given flow. | |
1032 | * | |
1033 | * It returns zero on success, or a standard errno code on error. | |
1034 | */ | |
4c9483b2 | 1035 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6) |
497c615a HX |
1036 | { |
1037 | *dst = NULL; | |
4c9483b2 | 1038 | return ip6_dst_lookup_tail(sk, dst, fl6); |
497c615a | 1039 | } |
3cf3dc6c ACM |
1040 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
1041 | ||
497c615a | 1042 | /** |
68d0c6d3 DM |
1043 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
1044 | * @sk: socket which provides route info | |
4c9483b2 | 1045 | * @fl6: flow to lookup |
68d0c6d3 | 1046 | * @final_dst: final destination address for ipsec lookup |
a1414715 | 1047 | * @can_sleep: we are in a sleepable context |
68d0c6d3 DM |
1048 | * |
1049 | * This function performs a route lookup on the given flow. | |
1050 | * | |
1051 | * It returns a valid dst pointer on success, or a pointer encoded | |
1052 | * error code. | |
1053 | */ | |
4c9483b2 | 1054 | struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
68d0c6d3 | 1055 | const struct in6_addr *final_dst, |
a1414715 | 1056 | bool can_sleep) |
68d0c6d3 DM |
1057 | { |
1058 | struct dst_entry *dst = NULL; | |
1059 | int err; | |
1060 | ||
4c9483b2 | 1061 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1062 | if (err) |
1063 | return ERR_PTR(err); | |
1064 | if (final_dst) | |
4e3fd7a0 | 1065 | fl6->daddr = *final_dst; |
2774c131 | 1066 | if (can_sleep) |
4c9483b2 | 1067 | fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; |
2774c131 | 1068 | |
4c9483b2 | 1069 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
68d0c6d3 DM |
1070 | } |
1071 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
1072 | ||
1073 | /** | |
1074 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
497c615a | 1075 | * @sk: socket which provides the dst cache and route info |
4c9483b2 | 1076 | * @fl6: flow to lookup |
68d0c6d3 | 1077 | * @final_dst: final destination address for ipsec lookup |
a1414715 | 1078 | * @can_sleep: we are in a sleepable context |
497c615a HX |
1079 | * |
1080 | * This function performs a route lookup on the given flow with the | |
1081 | * possibility of using the cached route in the socket if it is valid. | |
1082 | * It will take the socket dst lock when operating on the dst cache. | |
1083 | * As a result, this function can only be used in process context. | |
1084 | * | |
68d0c6d3 DM |
1085 | * It returns a valid dst pointer on success, or a pointer encoded |
1086 | * error code. | |
497c615a | 1087 | */ |
4c9483b2 | 1088 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
68d0c6d3 | 1089 | const struct in6_addr *final_dst, |
a1414715 | 1090 | bool can_sleep) |
497c615a | 1091 | { |
68d0c6d3 DM |
1092 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
1093 | int err; | |
497c615a | 1094 | |
4c9483b2 | 1095 | dst = ip6_sk_dst_check(sk, dst, fl6); |
68d0c6d3 | 1096 | |
4c9483b2 | 1097 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1098 | if (err) |
1099 | return ERR_PTR(err); | |
1100 | if (final_dst) | |
4e3fd7a0 | 1101 | fl6->daddr = *final_dst; |
2774c131 | 1102 | if (can_sleep) |
4c9483b2 | 1103 | fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; |
2774c131 | 1104 | |
4c9483b2 | 1105 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
497c615a | 1106 | } |
68d0c6d3 | 1107 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
497c615a | 1108 | |
34a0b3cd | 1109 | static inline int ip6_ufo_append_data(struct sock *sk, |
e89e9cf5 AR |
1110 | int getfrag(void *from, char *to, int offset, int len, |
1111 | int odd, struct sk_buff *skb), | |
1112 | void *from, int length, int hh_len, int fragheaderlen, | |
87c48fa3 ED |
1113 | int transhdrlen, int mtu,unsigned int flags, |
1114 | struct rt6_info *rt) | |
e89e9cf5 AR |
1115 | |
1116 | { | |
1117 | struct sk_buff *skb; | |
1118 | int err; | |
1119 | ||
1120 | /* There is support for UDP large send offload by network | |
1121 | * device, so create one single skb packet containing complete | |
1122 | * udp datagram | |
1123 | */ | |
1124 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
1125 | skb = sock_alloc_send_skb(sk, | |
1126 | hh_len + fragheaderlen + transhdrlen + 20, | |
1127 | (flags & MSG_DONTWAIT), &err); | |
1128 | if (skb == NULL) | |
504744e4 | 1129 | return err; |
e89e9cf5 AR |
1130 | |
1131 | /* reserve space for Hardware header */ | |
1132 | skb_reserve(skb, hh_len); | |
1133 | ||
1134 | /* create space for UDP/IP header */ | |
1135 | skb_put(skb,fragheaderlen + transhdrlen); | |
1136 | ||
1137 | /* initialize network header pointer */ | |
c1d2bbe1 | 1138 | skb_reset_network_header(skb); |
e89e9cf5 AR |
1139 | |
1140 | /* initialize protocol header pointer */ | |
b0e380b1 | 1141 | skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf5 | 1142 | |
84fa7933 | 1143 | skb->ip_summed = CHECKSUM_PARTIAL; |
e89e9cf5 | 1144 | skb->csum = 0; |
e89e9cf5 AR |
1145 | } |
1146 | ||
1147 | err = skb_append_datato_frags(sk,skb, getfrag, from, | |
1148 | (length - transhdrlen)); | |
1149 | if (!err) { | |
1150 | struct frag_hdr fhdr; | |
1151 | ||
c31d5326 SS |
1152 | /* Specify the length of each IPv6 datagram fragment. |
1153 | * It has to be a multiple of 8. | |
1154 | */ | |
1155 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - | |
1156 | sizeof(struct frag_hdr)) & ~7; | |
f83ef8c0 | 1157 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
87c48fa3 | 1158 | ipv6_select_ident(&fhdr, rt); |
e89e9cf5 AR |
1159 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; |
1160 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1161 | ||
1162 | return 0; | |
1163 | } | |
1164 | /* There is not enough support do UPD LSO, | |
1165 | * so follow normal path | |
1166 | */ | |
1167 | kfree_skb(skb); | |
1168 | ||
1169 | return err; | |
1170 | } | |
1da177e4 | 1171 | |
0178b695 HX |
1172 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1173 | gfp_t gfp) | |
1174 | { | |
1175 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1176 | } | |
1177 | ||
1178 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1179 | gfp_t gfp) | |
1180 | { | |
1181 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1182 | } | |
1183 | ||
41a1f8ea YH |
1184 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
1185 | int offset, int len, int odd, struct sk_buff *skb), | |
1186 | void *from, int length, int transhdrlen, | |
4c9483b2 | 1187 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, |
13b52cd4 | 1188 | struct rt6_info *rt, unsigned int flags, int dontfrag) |
1da177e4 LT |
1189 | { |
1190 | struct inet_sock *inet = inet_sk(sk); | |
1191 | struct ipv6_pinfo *np = inet6_sk(sk); | |
bdc712b4 | 1192 | struct inet_cork *cork; |
1da177e4 LT |
1193 | struct sk_buff *skb; |
1194 | unsigned int maxfraglen, fragheaderlen; | |
1195 | int exthdrlen; | |
299b0767 | 1196 | int dst_exthdrlen; |
1da177e4 LT |
1197 | int hh_len; |
1198 | int mtu; | |
1199 | int copy; | |
1200 | int err; | |
1201 | int offset = 0; | |
1202 | int csummode = CHECKSUM_NONE; | |
a693e698 | 1203 | __u8 tx_flags = 0; |
1da177e4 LT |
1204 | |
1205 | if (flags&MSG_PROBE) | |
1206 | return 0; | |
bdc712b4 | 1207 | cork = &inet->cork.base; |
1da177e4 LT |
1208 | if (skb_queue_empty(&sk->sk_write_queue)) { |
1209 | /* | |
1210 | * setup for corking | |
1211 | */ | |
1212 | if (opt) { | |
0178b695 | 1213 | if (WARN_ON(np->cork.opt)) |
1da177e4 | 1214 | return -EINVAL; |
0178b695 HX |
1215 | |
1216 | np->cork.opt = kmalloc(opt->tot_len, sk->sk_allocation); | |
1217 | if (unlikely(np->cork.opt == NULL)) | |
1218 | return -ENOBUFS; | |
1219 | ||
1220 | np->cork.opt->tot_len = opt->tot_len; | |
1221 | np->cork.opt->opt_flen = opt->opt_flen; | |
1222 | np->cork.opt->opt_nflen = opt->opt_nflen; | |
1223 | ||
1224 | np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
1225 | sk->sk_allocation); | |
1226 | if (opt->dst0opt && !np->cork.opt->dst0opt) | |
1227 | return -ENOBUFS; | |
1228 | ||
1229 | np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
1230 | sk->sk_allocation); | |
1231 | if (opt->dst1opt && !np->cork.opt->dst1opt) | |
1232 | return -ENOBUFS; | |
1233 | ||
1234 | np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt, | |
1235 | sk->sk_allocation); | |
1236 | if (opt->hopopt && !np->cork.opt->hopopt) | |
1237 | return -ENOBUFS; | |
1238 | ||
1239 | np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
1240 | sk->sk_allocation); | |
1241 | if (opt->srcrt && !np->cork.opt->srcrt) | |
1242 | return -ENOBUFS; | |
1243 | ||
1da177e4 LT |
1244 | /* need source address above miyazawa*/ |
1245 | } | |
d8d1f30b | 1246 | dst_hold(&rt->dst); |
bdc712b4 | 1247 | cork->dst = &rt->dst; |
4c9483b2 | 1248 | inet->cork.fl.u.ip6 = *fl6; |
1da177e4 | 1249 | np->cork.hop_limit = hlimit; |
41a1f8ea | 1250 | np->cork.tclass = tclass; |
628a5c56 | 1251 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? |
299b0767 | 1252 | rt->dst.dev->mtu : dst_mtu(&rt->dst); |
c7503609 | 1253 | if (np->frag_size < mtu) { |
d91675f9 YH |
1254 | if (np->frag_size) |
1255 | mtu = np->frag_size; | |
1256 | } | |
bdc712b4 | 1257 | cork->fragsize = mtu; |
d8d1f30b | 1258 | if (dst_allfrag(rt->dst.path)) |
bdc712b4 DM |
1259 | cork->flags |= IPCORK_ALLFRAG; |
1260 | cork->length = 0; | |
1da177e4 LT |
1261 | sk->sk_sndmsg_page = NULL; |
1262 | sk->sk_sndmsg_off = 0; | |
299b0767 | 1263 | exthdrlen = (opt ? opt->opt_flen : 0) - rt->rt6i_nfheader_len; |
1da177e4 LT |
1264 | length += exthdrlen; |
1265 | transhdrlen += exthdrlen; | |
299b0767 | 1266 | dst_exthdrlen = rt->dst.header_len; |
1da177e4 | 1267 | } else { |
bdc712b4 | 1268 | rt = (struct rt6_info *)cork->dst; |
4c9483b2 | 1269 | fl6 = &inet->cork.fl.u.ip6; |
0178b695 | 1270 | opt = np->cork.opt; |
1da177e4 LT |
1271 | transhdrlen = 0; |
1272 | exthdrlen = 0; | |
299b0767 | 1273 | dst_exthdrlen = 0; |
bdc712b4 | 1274 | mtu = cork->fragsize; |
1da177e4 LT |
1275 | } |
1276 | ||
d8d1f30b | 1277 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4 | 1278 | |
a1b05140 | 1279 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1280 | (opt ? opt->opt_nflen : 0); |
1da177e4 LT |
1281 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); |
1282 | ||
1283 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
bdc712b4 | 1284 | if (cork->length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { |
4c9483b2 | 1285 | ipv6_local_error(sk, EMSGSIZE, fl6, mtu-exthdrlen); |
1da177e4 LT |
1286 | return -EMSGSIZE; |
1287 | } | |
1288 | } | |
1289 | ||
a693e698 AB |
1290 | /* For UDP, check if TX timestamp is enabled */ |
1291 | if (sk->sk_type == SOCK_DGRAM) { | |
1292 | err = sock_tx_timestamp(sk, &tx_flags); | |
1293 | if (err) | |
1294 | goto error; | |
1295 | } | |
1296 | ||
1da177e4 LT |
1297 | /* |
1298 | * Let's try using as much space as possible. | |
1299 | * Use MTU if total length of the message fits into the MTU. | |
1300 | * Otherwise, we need to reserve fragment header and | |
1301 | * fragment alignment (= 8-15 octects, in total). | |
1302 | * | |
1303 | * Note that we may need to "move" the data from the tail of | |
1ab1457c | 1304 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1305 | * the message. |
1306 | * | |
1ab1457c | 1307 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1308 | * at once if non-fragmentable extension headers |
1309 | * are too large. | |
1ab1457c | 1310 | * --yoshfuji |
1da177e4 LT |
1311 | */ |
1312 | ||
bdc712b4 | 1313 | cork->length += length; |
4b340ae2 BH |
1314 | if (length > mtu) { |
1315 | int proto = sk->sk_protocol; | |
1316 | if (dontfrag && (proto == IPPROTO_UDP || proto == IPPROTO_RAW)){ | |
4c9483b2 | 1317 | ipv6_local_rxpmtu(sk, fl6, mtu-exthdrlen); |
4b340ae2 BH |
1318 | return -EMSGSIZE; |
1319 | } | |
e89e9cf5 | 1320 | |
4b340ae2 | 1321 | if (proto == IPPROTO_UDP && |
d8d1f30b | 1322 | (rt->dst.dev->features & NETIF_F_UFO)) { |
4b340ae2 BH |
1323 | |
1324 | err = ip6_ufo_append_data(sk, getfrag, from, length, | |
1325 | hh_len, fragheaderlen, | |
87c48fa3 | 1326 | transhdrlen, mtu, flags, rt); |
4b340ae2 BH |
1327 | if (err) |
1328 | goto error; | |
1329 | return 0; | |
1330 | } | |
e89e9cf5 | 1331 | } |
1da177e4 LT |
1332 | |
1333 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) | |
1334 | goto alloc_new_skb; | |
1335 | ||
1336 | while (length > 0) { | |
1337 | /* Check if the remaining data fits into current packet. */ | |
bdc712b4 | 1338 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
1da177e4 LT |
1339 | if (copy < length) |
1340 | copy = maxfraglen - skb->len; | |
1341 | ||
1342 | if (copy <= 0) { | |
1343 | char *data; | |
1344 | unsigned int datalen; | |
1345 | unsigned int fraglen; | |
1346 | unsigned int fraggap; | |
1347 | unsigned int alloclen; | |
1348 | struct sk_buff *skb_prev; | |
1349 | alloc_new_skb: | |
1350 | skb_prev = skb; | |
1351 | ||
1352 | /* There's no room in the current skb */ | |
1353 | if (skb_prev) | |
1354 | fraggap = skb_prev->len - maxfraglen; | |
1355 | else | |
1356 | fraggap = 0; | |
1357 | ||
1358 | /* | |
1359 | * If remaining data exceeds the mtu, | |
1360 | * we know we need more fragment(s). | |
1361 | */ | |
1362 | datalen = length + fraggap; | |
bdc712b4 | 1363 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
1da177e4 LT |
1364 | datalen = maxfraglen - fragheaderlen; |
1365 | ||
1366 | fraglen = datalen + fragheaderlen; | |
1367 | if ((flags & MSG_MORE) && | |
d8d1f30b | 1368 | !(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4 LT |
1369 | alloclen = mtu; |
1370 | else | |
1371 | alloclen = datalen + fragheaderlen; | |
1372 | ||
299b0767 SK |
1373 | alloclen += dst_exthdrlen; |
1374 | ||
1da177e4 LT |
1375 | /* |
1376 | * The last fragment gets additional space at tail. | |
1377 | * Note: we overallocate on fragments with MSG_MODE | |
1378 | * because we have no idea if we're the last one. | |
1379 | */ | |
1380 | if (datalen == length + fraggap) | |
d8d1f30b | 1381 | alloclen += rt->dst.trailer_len; |
1da177e4 LT |
1382 | |
1383 | /* | |
1384 | * We just reserve space for fragment header. | |
1ab1457c | 1385 | * Note: this may be overallocation if the message |
1da177e4 LT |
1386 | * (without MSG_MORE) fits into the MTU. |
1387 | */ | |
1388 | alloclen += sizeof(struct frag_hdr); | |
1389 | ||
1390 | if (transhdrlen) { | |
1391 | skb = sock_alloc_send_skb(sk, | |
1392 | alloclen + hh_len, | |
1393 | (flags & MSG_DONTWAIT), &err); | |
1394 | } else { | |
1395 | skb = NULL; | |
1396 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1397 | 2 * sk->sk_sndbuf) | |
1398 | skb = sock_wmalloc(sk, | |
1399 | alloclen + hh_len, 1, | |
1400 | sk->sk_allocation); | |
1401 | if (unlikely(skb == NULL)) | |
1402 | err = -ENOBUFS; | |
a693e698 AB |
1403 | else { |
1404 | /* Only the initial fragment | |
1405 | * is time stamped. | |
1406 | */ | |
1407 | tx_flags = 0; | |
1408 | } | |
1da177e4 LT |
1409 | } |
1410 | if (skb == NULL) | |
1411 | goto error; | |
1412 | /* | |
1413 | * Fill in the control structures | |
1414 | */ | |
1415 | skb->ip_summed = csummode; | |
1416 | skb->csum = 0; | |
1f85851e G |
1417 | /* reserve for fragmentation and ipsec header */ |
1418 | skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + | |
1419 | dst_exthdrlen); | |
1da177e4 | 1420 | |
a693e698 AB |
1421 | if (sk->sk_type == SOCK_DGRAM) |
1422 | skb_shinfo(skb)->tx_flags = tx_flags; | |
1423 | ||
1da177e4 LT |
1424 | /* |
1425 | * Find where to start putting bytes | |
1426 | */ | |
1f85851e G |
1427 | data = skb_put(skb, fraglen); |
1428 | skb_set_network_header(skb, exthdrlen); | |
1429 | data += fragheaderlen; | |
b0e380b1 ACM |
1430 | skb->transport_header = (skb->network_header + |
1431 | fragheaderlen); | |
1da177e4 LT |
1432 | if (fraggap) { |
1433 | skb->csum = skb_copy_and_csum_bits( | |
1434 | skb_prev, maxfraglen, | |
1435 | data + transhdrlen, fraggap, 0); | |
1436 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1437 | skb->csum); | |
1438 | data += fraggap; | |
e9fa4f7b | 1439 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1440 | } |
1441 | copy = datalen - transhdrlen - fraggap; | |
299b0767 | 1442 | |
1da177e4 LT |
1443 | if (copy < 0) { |
1444 | err = -EINVAL; | |
1445 | kfree_skb(skb); | |
1446 | goto error; | |
1447 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1448 | err = -EFAULT; | |
1449 | kfree_skb(skb); | |
1450 | goto error; | |
1451 | } | |
1452 | ||
1453 | offset += copy; | |
1454 | length -= datalen - fraggap; | |
1455 | transhdrlen = 0; | |
1456 | exthdrlen = 0; | |
299b0767 | 1457 | dst_exthdrlen = 0; |
1da177e4 LT |
1458 | csummode = CHECKSUM_NONE; |
1459 | ||
1460 | /* | |
1461 | * Put the packet on the pending queue | |
1462 | */ | |
1463 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1464 | continue; | |
1465 | } | |
1466 | ||
1467 | if (copy > length) | |
1468 | copy = length; | |
1469 | ||
d8d1f30b | 1470 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
1da177e4 LT |
1471 | unsigned int off; |
1472 | ||
1473 | off = skb->len; | |
1474 | if (getfrag(from, skb_put(skb, copy), | |
1475 | offset, copy, off, skb) < 0) { | |
1476 | __skb_trim(skb, off); | |
1477 | err = -EFAULT; | |
1478 | goto error; | |
1479 | } | |
1480 | } else { | |
1481 | int i = skb_shinfo(skb)->nr_frags; | |
1482 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | |
1483 | struct page *page = sk->sk_sndmsg_page; | |
1484 | int off = sk->sk_sndmsg_off; | |
1485 | unsigned int left; | |
1486 | ||
1487 | if (page && (left = PAGE_SIZE - off) > 0) { | |
1488 | if (copy >= left) | |
1489 | copy = left; | |
408dadf0 | 1490 | if (page != skb_frag_page(frag)) { |
1da177e4 LT |
1491 | if (i == MAX_SKB_FRAGS) { |
1492 | err = -EMSGSIZE; | |
1493 | goto error; | |
1494 | } | |
1da177e4 | 1495 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); |
408dadf0 | 1496 | skb_frag_ref(skb, i); |
1da177e4 LT |
1497 | frag = &skb_shinfo(skb)->frags[i]; |
1498 | } | |
1499 | } else if(i < MAX_SKB_FRAGS) { | |
1500 | if (copy > PAGE_SIZE) | |
1501 | copy = PAGE_SIZE; | |
1502 | page = alloc_pages(sk->sk_allocation, 0); | |
1503 | if (page == NULL) { | |
1504 | err = -ENOMEM; | |
1505 | goto error; | |
1506 | } | |
1507 | sk->sk_sndmsg_page = page; | |
1508 | sk->sk_sndmsg_off = 0; | |
1509 | ||
1510 | skb_fill_page_desc(skb, i, page, 0, 0); | |
1511 | frag = &skb_shinfo(skb)->frags[i]; | |
1da177e4 LT |
1512 | } else { |
1513 | err = -EMSGSIZE; | |
1514 | goto error; | |
1515 | } | |
9e903e08 ED |
1516 | if (getfrag(from, |
1517 | skb_frag_address(frag) + skb_frag_size(frag), | |
408dadf0 | 1518 | offset, copy, skb->len, skb) < 0) { |
1da177e4 LT |
1519 | err = -EFAULT; |
1520 | goto error; | |
1521 | } | |
1522 | sk->sk_sndmsg_off += copy; | |
9e903e08 | 1523 | skb_frag_size_add(frag, copy); |
1da177e4 LT |
1524 | skb->len += copy; |
1525 | skb->data_len += copy; | |
f945fa7a HX |
1526 | skb->truesize += copy; |
1527 | atomic_add(copy, &sk->sk_wmem_alloc); | |
1da177e4 LT |
1528 | } |
1529 | offset += copy; | |
1530 | length -= copy; | |
1531 | } | |
1532 | return 0; | |
1533 | error: | |
bdc712b4 | 1534 | cork->length -= length; |
3bd653c8 | 1535 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1536 | return err; |
1537 | } | |
1538 | ||
bf138862 PE |
1539 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
1540 | { | |
0178b695 HX |
1541 | if (np->cork.opt) { |
1542 | kfree(np->cork.opt->dst0opt); | |
1543 | kfree(np->cork.opt->dst1opt); | |
1544 | kfree(np->cork.opt->hopopt); | |
1545 | kfree(np->cork.opt->srcrt); | |
1546 | kfree(np->cork.opt); | |
1547 | np->cork.opt = NULL; | |
1548 | } | |
1549 | ||
bdc712b4 DM |
1550 | if (inet->cork.base.dst) { |
1551 | dst_release(inet->cork.base.dst); | |
1552 | inet->cork.base.dst = NULL; | |
1553 | inet->cork.base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 PE |
1554 | } |
1555 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1556 | } | |
1557 | ||
1da177e4 LT |
1558 | int ip6_push_pending_frames(struct sock *sk) |
1559 | { | |
1560 | struct sk_buff *skb, *tmp_skb; | |
1561 | struct sk_buff **tail_skb; | |
1562 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1563 | struct inet_sock *inet = inet_sk(sk); | |
1564 | struct ipv6_pinfo *np = inet6_sk(sk); | |
3bd653c8 | 1565 | struct net *net = sock_net(sk); |
1da177e4 LT |
1566 | struct ipv6hdr *hdr; |
1567 | struct ipv6_txoptions *opt = np->cork.opt; | |
bdc712b4 | 1568 | struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst; |
4c9483b2 DM |
1569 | struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
1570 | unsigned char proto = fl6->flowi6_proto; | |
1da177e4 LT |
1571 | int err = 0; |
1572 | ||
1573 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1574 | goto out; | |
1575 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1576 | ||
1577 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1578 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1579 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1580 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
cfe1fc77 | 1581 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1582 | *tail_skb = tmp_skb; |
1583 | tail_skb = &(tmp_skb->next); | |
1584 | skb->len += tmp_skb->len; | |
1585 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1586 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1587 | tmp_skb->destructor = NULL; |
1588 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1589 | } |
1590 | ||
28a89453 | 1591 | /* Allow local fragmentation. */ |
b5c15fc0 | 1592 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
28a89453 HX |
1593 | skb->local_df = 1; |
1594 | ||
4e3fd7a0 | 1595 | *final_dst = fl6->daddr; |
cfe1fc77 | 1596 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1597 | if (opt && opt->opt_flen) |
1598 | ipv6_push_frag_opts(skb, opt, &proto); | |
1599 | if (opt && opt->opt_nflen) | |
1600 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1601 | ||
e2d1bca7 ACM |
1602 | skb_push(skb, sizeof(struct ipv6hdr)); |
1603 | skb_reset_network_header(skb); | |
0660e03f | 1604 | hdr = ipv6_hdr(skb); |
1ab1457c | 1605 | |
4c9483b2 | 1606 | *(__be32*)hdr = fl6->flowlabel | |
41a1f8ea | 1607 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
1da177e4 | 1608 | |
1da177e4 LT |
1609 | hdr->hop_limit = np->cork.hop_limit; |
1610 | hdr->nexthdr = proto; | |
4e3fd7a0 AD |
1611 | hdr->saddr = fl6->saddr; |
1612 | hdr->daddr = *final_dst; | |
1da177e4 | 1613 | |
a2c2064f | 1614 | skb->priority = sk->sk_priority; |
4a19ec58 | 1615 | skb->mark = sk->sk_mark; |
a2c2064f | 1616 | |
d8d1f30b | 1617 | skb_dst_set(skb, dst_clone(&rt->dst)); |
edf391ff | 1618 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1619 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1620 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1621 | |
5a57d4c7 | 1622 | ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); |
e41b5368 | 1623 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); |
14878f75 DS |
1624 | } |
1625 | ||
ef76bc23 | 1626 | err = ip6_local_out(skb); |
1da177e4 LT |
1627 | if (err) { |
1628 | if (err > 0) | |
6ce9e7b5 | 1629 | err = net_xmit_errno(err); |
1da177e4 LT |
1630 | if (err) |
1631 | goto error; | |
1632 | } | |
1633 | ||
1634 | out: | |
bf138862 | 1635 | ip6_cork_release(inet, np); |
1da177e4 LT |
1636 | return err; |
1637 | error: | |
06254914 | 1638 | IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1639 | goto out; |
1640 | } | |
1641 | ||
1642 | void ip6_flush_pending_frames(struct sock *sk) | |
1643 | { | |
1da177e4 LT |
1644 | struct sk_buff *skb; |
1645 | ||
1646 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
adf30907 ED |
1647 | if (skb_dst(skb)) |
1648 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1649 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1650 | kfree_skb(skb); |
1651 | } | |
1652 | ||
bf138862 | 1653 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
1da177e4 | 1654 | } |