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(); |
69cce1d1 | 139 | neigh = dst_get_neighbour(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, |
4e15ed4d | 183 | struct ipv6_txoptions *opt) |
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 GR |
192 | int hlimit = -1; |
193 | int tclass = 0; | |
1da177e4 LT |
194 | u32 mtu; |
195 | ||
196 | if (opt) { | |
c2636b4d | 197 | unsigned int head_room; |
1da177e4 LT |
198 | |
199 | /* First: exthdrs may take lots of space (~8K for now) | |
200 | MAX_HEADER is not enough. | |
201 | */ | |
202 | head_room = opt->opt_nflen + opt->opt_flen; | |
203 | seg_len += head_room; | |
204 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
205 | ||
206 | if (skb_headroom(skb) < head_room) { | |
207 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
a11d206d | 208 | if (skb2 == NULL) { |
adf30907 | 209 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
210 | IPSTATS_MIB_OUTDISCARDS); |
211 | kfree_skb(skb); | |
1da177e4 LT |
212 | return -ENOBUFS; |
213 | } | |
a11d206d YH |
214 | kfree_skb(skb); |
215 | skb = skb2; | |
83d7eb29 | 216 | skb_set_owner_w(skb, sk); |
1da177e4 LT |
217 | } |
218 | if (opt->opt_flen) | |
219 | ipv6_push_frag_opts(skb, opt, &proto); | |
220 | if (opt->opt_nflen) | |
221 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
222 | } | |
223 | ||
e2d1bca7 ACM |
224 | skb_push(skb, sizeof(struct ipv6hdr)); |
225 | skb_reset_network_header(skb); | |
0660e03f | 226 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
227 | |
228 | /* | |
229 | * Fill in the IPv6 header | |
230 | */ | |
e651f03a GR |
231 | if (np) { |
232 | tclass = np->tclass; | |
1da177e4 | 233 | hlimit = np->hop_limit; |
e651f03a | 234 | } |
1da177e4 | 235 | if (hlimit < 0) |
6b75d090 | 236 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 237 | |
4c9483b2 | 238 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl6->flowlabel; |
41a1f8ea | 239 | |
1da177e4 LT |
240 | hdr->payload_len = htons(seg_len); |
241 | hdr->nexthdr = proto; | |
242 | hdr->hop_limit = hlimit; | |
243 | ||
4c9483b2 | 244 | ipv6_addr_copy(&hdr->saddr, &fl6->saddr); |
1da177e4 LT |
245 | ipv6_addr_copy(&hdr->daddr, first_hop); |
246 | ||
a2c2064f | 247 | skb->priority = sk->sk_priority; |
4a19ec58 | 248 | skb->mark = sk->sk_mark; |
a2c2064f | 249 | |
1da177e4 | 250 | mtu = dst_mtu(dst); |
283d07ac | 251 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
adf30907 | 252 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 253 | IPSTATS_MIB_OUT, skb->len); |
b2e0b385 JE |
254 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
255 | dst->dev, dst_output); | |
1da177e4 LT |
256 | } |
257 | ||
258 | if (net_ratelimit()) | |
259 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); | |
260 | skb->dev = dst->dev; | |
3ffe533c | 261 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 262 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
263 | kfree_skb(skb); |
264 | return -EMSGSIZE; | |
265 | } | |
266 | ||
7159039a YH |
267 | EXPORT_SYMBOL(ip6_xmit); |
268 | ||
1da177e4 LT |
269 | /* |
270 | * To avoid extra problems ND packets are send through this | |
271 | * routine. It's code duplication but I really want to avoid | |
272 | * extra checks since ipv6_build_header is used by TCP (which | |
273 | * is for us performance critical) | |
274 | */ | |
275 | ||
276 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, | |
9acd9f3a | 277 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
1da177e4 LT |
278 | int proto, int len) |
279 | { | |
280 | struct ipv6_pinfo *np = inet6_sk(sk); | |
281 | struct ipv6hdr *hdr; | |
1da177e4 LT |
282 | |
283 | skb->protocol = htons(ETH_P_IPV6); | |
284 | skb->dev = dev; | |
285 | ||
55f79cc0 ACM |
286 | skb_reset_network_header(skb); |
287 | skb_put(skb, sizeof(struct ipv6hdr)); | |
0660e03f | 288 | hdr = ipv6_hdr(skb); |
1da177e4 | 289 | |
ae08e1f0 | 290 | *(__be32*)hdr = htonl(0x60000000); |
1da177e4 LT |
291 | |
292 | hdr->payload_len = htons(len); | |
293 | hdr->nexthdr = proto; | |
294 | hdr->hop_limit = np->hop_limit; | |
295 | ||
296 | ipv6_addr_copy(&hdr->saddr, saddr); | |
297 | ipv6_addr_copy(&hdr->daddr, daddr); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
303 | { | |
304 | struct ip6_ra_chain *ra; | |
305 | struct sock *last = NULL; | |
306 | ||
307 | read_lock(&ip6_ra_lock); | |
308 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
309 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
310 | if (sk && ra->sel == sel && |
311 | (!sk->sk_bound_dev_if || | |
312 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
313 | if (last) { |
314 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
315 | if (skb2) | |
316 | rawv6_rcv(last, skb2); | |
317 | } | |
318 | last = sk; | |
319 | } | |
320 | } | |
321 | ||
322 | if (last) { | |
323 | rawv6_rcv(last, skb); | |
324 | read_unlock(&ip6_ra_lock); | |
325 | return 1; | |
326 | } | |
327 | read_unlock(&ip6_ra_lock); | |
328 | return 0; | |
329 | } | |
330 | ||
e21e0b5f VN |
331 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
332 | { | |
0660e03f | 333 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f VN |
334 | u8 nexthdr = hdr->nexthdr; |
335 | int offset; | |
336 | ||
337 | if (ipv6_ext_hdr(nexthdr)) { | |
338 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr); | |
339 | if (offset < 0) | |
340 | return 0; | |
341 | } else | |
342 | offset = sizeof(struct ipv6hdr); | |
343 | ||
344 | if (nexthdr == IPPROTO_ICMPV6) { | |
345 | struct icmp6hdr *icmp6; | |
346 | ||
d56f90a7 ACM |
347 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
348 | offset + 1 - skb->data))) | |
e21e0b5f VN |
349 | return 0; |
350 | ||
d56f90a7 | 351 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
352 | |
353 | switch (icmp6->icmp6_type) { | |
354 | case NDISC_ROUTER_SOLICITATION: | |
355 | case NDISC_ROUTER_ADVERTISEMENT: | |
356 | case NDISC_NEIGHBOUR_SOLICITATION: | |
357 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
358 | case NDISC_REDIRECT: | |
359 | /* For reaction involving unicast neighbor discovery | |
360 | * message destined to the proxied address, pass it to | |
361 | * input function. | |
362 | */ | |
363 | return 1; | |
364 | default: | |
365 | break; | |
366 | } | |
367 | } | |
368 | ||
74553b09 VN |
369 | /* |
370 | * The proxying router can't forward traffic sent to a link-local | |
371 | * address, so signal the sender and discard the packet. This | |
372 | * behavior is clarified by the MIPv6 specification. | |
373 | */ | |
374 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
375 | dst_link_failure(skb); | |
376 | return -1; | |
377 | } | |
378 | ||
e21e0b5f VN |
379 | return 0; |
380 | } | |
381 | ||
1da177e4 LT |
382 | static inline int ip6_forward_finish(struct sk_buff *skb) |
383 | { | |
384 | return dst_output(skb); | |
385 | } | |
386 | ||
387 | int ip6_forward(struct sk_buff *skb) | |
388 | { | |
adf30907 | 389 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 390 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 391 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 392 | struct net *net = dev_net(dst->dev); |
69cce1d1 | 393 | struct neighbour *n; |
14f3ad6f | 394 | u32 mtu; |
1ab1457c | 395 | |
53b7997f | 396 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
397 | goto error; |
398 | ||
4497b076 BH |
399 | if (skb_warn_if_lro(skb)) |
400 | goto drop; | |
401 | ||
1da177e4 | 402 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
3bd653c8 | 403 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
404 | goto drop; |
405 | } | |
406 | ||
72b43d08 AK |
407 | if (skb->pkt_type != PACKET_HOST) |
408 | goto drop; | |
409 | ||
35fc92a9 | 410 | skb_forward_csum(skb); |
1da177e4 LT |
411 | |
412 | /* | |
413 | * We DO NOT make any processing on | |
414 | * RA packets, pushing them to user level AS IS | |
415 | * without ane WARRANTY that application will be able | |
416 | * to interpret them. The reason is that we | |
417 | * cannot make anything clever here. | |
418 | * | |
419 | * We are not end-node, so that if packet contains | |
420 | * AH/ESP, we cannot make anything. | |
421 | * Defragmentation also would be mistake, RA packets | |
422 | * cannot be fragmented, because there is no warranty | |
423 | * that different fragments will go along one path. --ANK | |
424 | */ | |
425 | if (opt->ra) { | |
d56f90a7 | 426 | u8 *ptr = skb_network_header(skb) + opt->ra; |
1da177e4 LT |
427 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
428 | return 0; | |
429 | } | |
430 | ||
431 | /* | |
432 | * check and decrement ttl | |
433 | */ | |
434 | if (hdr->hop_limit <= 1) { | |
435 | /* Force OUTPUT device used as source address */ | |
436 | skb->dev = dst->dev; | |
3ffe533c | 437 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
483a47d2 DL |
438 | IP6_INC_STATS_BH(net, |
439 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
440 | |
441 | kfree_skb(skb); | |
442 | return -ETIMEDOUT; | |
443 | } | |
444 | ||
fbea49e1 | 445 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 446 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 447 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
448 | int proxied = ip6_forward_proxy_check(skb); |
449 | if (proxied > 0) | |
e21e0b5f | 450 | return ip6_input(skb); |
74553b09 | 451 | else if (proxied < 0) { |
3bd653c8 DL |
452 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
453 | IPSTATS_MIB_INDISCARDS); | |
74553b09 VN |
454 | goto drop; |
455 | } | |
e21e0b5f VN |
456 | } |
457 | ||
1da177e4 | 458 | if (!xfrm6_route_forward(skb)) { |
3bd653c8 | 459 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
460 | goto drop; |
461 | } | |
adf30907 | 462 | dst = skb_dst(skb); |
1da177e4 LT |
463 | |
464 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
465 | send redirects to source routed frames. | |
1e5dc146 | 466 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 467 | */ |
69cce1d1 DM |
468 | n = dst_get_neighbour(dst); |
469 | if (skb->dev == dst->dev && n && opt->srcrt == 0 && !skb_sec_path(skb)) { | |
1da177e4 LT |
470 | struct in6_addr *target = NULL; |
471 | struct rt6_info *rt; | |
1da177e4 LT |
472 | |
473 | /* | |
474 | * incoming and outgoing devices are the same | |
475 | * send a redirect. | |
476 | */ | |
477 | ||
478 | rt = (struct rt6_info *) dst; | |
479 | if ((rt->rt6i_flags & RTF_GATEWAY)) | |
480 | target = (struct in6_addr*)&n->primary_key; | |
481 | else | |
482 | target = &hdr->daddr; | |
483 | ||
92d86829 DM |
484 | if (!rt->rt6i_peer) |
485 | rt6_bind_peer(rt, 1); | |
486 | ||
1da177e4 LT |
487 | /* Limit redirects both by destination (here) |
488 | and by source (inside ndisc_send_redirect) | |
489 | */ | |
92d86829 | 490 | if (inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ)) |
1da177e4 | 491 | ndisc_send_redirect(skb, n, target); |
5bb1ab09 DS |
492 | } else { |
493 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
494 | ||
1da177e4 | 495 | /* This check is security critical. */ |
f81b2e7d YH |
496 | if (addrtype == IPV6_ADDR_ANY || |
497 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
498 | goto error; |
499 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
500 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3ffe533c | 501 | ICMPV6_NOT_NEIGHBOUR, 0); |
5bb1ab09 DS |
502 | goto error; |
503 | } | |
1da177e4 LT |
504 | } |
505 | ||
14f3ad6f UW |
506 | mtu = dst_mtu(dst); |
507 | if (mtu < IPV6_MIN_MTU) | |
508 | mtu = IPV6_MIN_MTU; | |
509 | ||
0aa68271 | 510 | if (skb->len > mtu && !skb_is_gso(skb)) { |
1da177e4 LT |
511 | /* Again, force OUTPUT device used as source address */ |
512 | skb->dev = dst->dev; | |
14f3ad6f | 513 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
483a47d2 DL |
514 | IP6_INC_STATS_BH(net, |
515 | ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); | |
516 | IP6_INC_STATS_BH(net, | |
517 | ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
518 | kfree_skb(skb); |
519 | return -EMSGSIZE; | |
520 | } | |
521 | ||
522 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
3bd653c8 | 523 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
524 | goto drop; |
525 | } | |
526 | ||
0660e03f | 527 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
528 | |
529 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 530 | |
1da177e4 LT |
531 | hdr->hop_limit--; |
532 | ||
483a47d2 | 533 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
b2e0b385 | 534 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
6e23ae2a | 535 | ip6_forward_finish); |
1da177e4 LT |
536 | |
537 | error: | |
483a47d2 | 538 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
539 | drop: |
540 | kfree_skb(skb); | |
541 | return -EINVAL; | |
542 | } | |
543 | ||
544 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
545 | { | |
546 | to->pkt_type = from->pkt_type; | |
547 | to->priority = from->priority; | |
548 | to->protocol = from->protocol; | |
adf30907 ED |
549 | skb_dst_drop(to); |
550 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 551 | to->dev = from->dev; |
82e91ffe | 552 | to->mark = from->mark; |
1da177e4 LT |
553 | |
554 | #ifdef CONFIG_NET_SCHED | |
555 | to->tc_index = from->tc_index; | |
556 | #endif | |
e7ac05f3 | 557 | nf_copy(to, from); |
ba9dda3a JK |
558 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
559 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
560 | to->nf_trace = from->nf_trace; | |
561 | #endif | |
984bc16c | 562 | skb_copy_secmark(to, from); |
1da177e4 LT |
563 | } |
564 | ||
565 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
566 | { | |
567 | u16 offset = sizeof(struct ipv6hdr); | |
0660e03f ACM |
568 | struct ipv6_opt_hdr *exthdr = |
569 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
27a884dc | 570 | unsigned int packet_len = skb->tail - skb->network_header; |
1da177e4 | 571 | int found_rhdr = 0; |
0660e03f | 572 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
1da177e4 LT |
573 | |
574 | while (offset + 1 <= packet_len) { | |
575 | ||
576 | switch (**nexthdr) { | |
577 | ||
578 | case NEXTHDR_HOP: | |
27637df9 | 579 | break; |
1da177e4 | 580 | case NEXTHDR_ROUTING: |
27637df9 MN |
581 | found_rhdr = 1; |
582 | break; | |
1da177e4 | 583 | case NEXTHDR_DEST: |
59fbb3a6 | 584 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
585 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
586 | break; | |
587 | #endif | |
588 | if (found_rhdr) | |
589 | return offset; | |
1da177e4 LT |
590 | break; |
591 | default : | |
592 | return offset; | |
593 | } | |
27637df9 MN |
594 | |
595 | offset += ipv6_optlen(exthdr); | |
596 | *nexthdr = &exthdr->nexthdr; | |
d56f90a7 ACM |
597 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
598 | offset); | |
1da177e4 LT |
599 | } |
600 | ||
601 | return offset; | |
602 | } | |
603 | ||
87c48fa3 ED |
604 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) |
605 | { | |
606 | static atomic_t ipv6_fragmentation_id; | |
607 | int old, new; | |
608 | ||
609 | if (rt) { | |
610 | struct inet_peer *peer; | |
611 | ||
612 | if (!rt->rt6i_peer) | |
613 | rt6_bind_peer(rt, 1); | |
614 | peer = rt->rt6i_peer; | |
615 | if (peer) { | |
616 | fhdr->identification = htonl(inet_getid(peer, 0)); | |
617 | return; | |
618 | } | |
619 | } | |
620 | do { | |
621 | old = atomic_read(&ipv6_fragmentation_id); | |
622 | new = old + 1; | |
623 | if (!new) | |
624 | new = 1; | |
625 | } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old); | |
626 | fhdr->identification = htonl(new); | |
627 | } | |
628 | ||
ad0081e4 | 629 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
1da177e4 | 630 | { |
1da177e4 | 631 | struct sk_buff *frag; |
adf30907 | 632 | struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); |
d91675f9 | 633 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
634 | struct ipv6hdr *tmp_hdr; |
635 | struct frag_hdr *fh; | |
636 | unsigned int mtu, hlen, left, len; | |
ae08e1f0 | 637 | __be32 frag_id = 0; |
1da177e4 LT |
638 | int ptr, offset = 0, err=0; |
639 | u8 *prevhdr, nexthdr = 0; | |
adf30907 | 640 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 641 | |
1da177e4 LT |
642 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
643 | nexthdr = *prevhdr; | |
644 | ||
628a5c56 | 645 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
646 | |
647 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 648 | * or if the skb it not generated by a local socket. |
b881ef76 | 649 | */ |
f2228f78 | 650 | if (!skb->local_df && skb->len > mtu) { |
adf30907 | 651 | skb->dev = skb_dst(skb)->dev; |
3ffe533c | 652 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 653 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 654 | IPSTATS_MIB_FRAGFAILS); |
b881ef76 JH |
655 | kfree_skb(skb); |
656 | return -EMSGSIZE; | |
657 | } | |
658 | ||
d91675f9 YH |
659 | if (np && np->frag_size < mtu) { |
660 | if (np->frag_size) | |
661 | mtu = np->frag_size; | |
662 | } | |
663 | mtu -= hlen + sizeof(struct frag_hdr); | |
1da177e4 | 664 | |
21dc3301 | 665 | if (skb_has_frag_list(skb)) { |
1da177e4 | 666 | int first_len = skb_pagelen(skb); |
3d13008e | 667 | struct sk_buff *frag2; |
1da177e4 LT |
668 | |
669 | if (first_len - hlen > mtu || | |
670 | ((first_len - hlen) & 7) || | |
671 | skb_cloned(skb)) | |
672 | goto slow_path; | |
673 | ||
4d9092bb | 674 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
675 | /* Correct geometry. */ |
676 | if (frag->len > mtu || | |
677 | ((frag->len & 7) && frag->next) || | |
678 | skb_headroom(frag) < hlen) | |
3d13008e | 679 | goto slow_path_clean; |
1da177e4 | 680 | |
1da177e4 LT |
681 | /* Partially cloned skb? */ |
682 | if (skb_shared(frag)) | |
3d13008e | 683 | goto slow_path_clean; |
2fdba6b0 HX |
684 | |
685 | BUG_ON(frag->sk); | |
686 | if (skb->sk) { | |
2fdba6b0 HX |
687 | frag->sk = skb->sk; |
688 | frag->destructor = sock_wfree; | |
2fdba6b0 | 689 | } |
3d13008e | 690 | skb->truesize -= frag->truesize; |
1da177e4 LT |
691 | } |
692 | ||
693 | err = 0; | |
694 | offset = 0; | |
695 | frag = skb_shinfo(skb)->frag_list; | |
4d9092bb | 696 | skb_frag_list_init(skb); |
1da177e4 LT |
697 | /* BUILD HEADER */ |
698 | ||
9a217a1c | 699 | *prevhdr = NEXTHDR_FRAGMENT; |
d56f90a7 | 700 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
1da177e4 | 701 | if (!tmp_hdr) { |
adf30907 | 702 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 703 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
704 | return -ENOMEM; |
705 | } | |
706 | ||
1da177e4 LT |
707 | __skb_pull(skb, hlen); |
708 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
e2d1bca7 ACM |
709 | __skb_push(skb, hlen); |
710 | skb_reset_network_header(skb); | |
d56f90a7 | 711 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
1da177e4 | 712 | |
87c48fa3 | 713 | ipv6_select_ident(fh, rt); |
1da177e4 LT |
714 | fh->nexthdr = nexthdr; |
715 | fh->reserved = 0; | |
716 | fh->frag_off = htons(IP6_MF); | |
717 | frag_id = fh->identification; | |
718 | ||
719 | first_len = skb_pagelen(skb); | |
720 | skb->data_len = first_len - skb_headlen(skb); | |
721 | skb->len = first_len; | |
0660e03f ACM |
722 | ipv6_hdr(skb)->payload_len = htons(first_len - |
723 | sizeof(struct ipv6hdr)); | |
a11d206d | 724 | |
d8d1f30b | 725 | dst_hold(&rt->dst); |
1da177e4 LT |
726 | |
727 | for (;;) { | |
728 | /* Prepare header of the next frame, | |
729 | * before previous one went down. */ | |
730 | if (frag) { | |
731 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 732 | skb_reset_transport_header(frag); |
1da177e4 | 733 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
734 | __skb_push(frag, hlen); |
735 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
736 | memcpy(skb_network_header(frag), tmp_hdr, |
737 | hlen); | |
1da177e4 LT |
738 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
739 | fh->nexthdr = nexthdr; | |
740 | fh->reserved = 0; | |
741 | fh->frag_off = htons(offset); | |
742 | if (frag->next != NULL) | |
743 | fh->frag_off |= htons(IP6_MF); | |
744 | fh->identification = frag_id; | |
0660e03f ACM |
745 | ipv6_hdr(frag)->payload_len = |
746 | htons(frag->len - | |
747 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
748 | ip6_copy_metadata(frag, skb); |
749 | } | |
1ab1457c | 750 | |
1da177e4 | 751 | err = output(skb); |
dafee490 | 752 | if(!err) |
d8d1f30b | 753 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 754 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 755 | |
1da177e4 LT |
756 | if (err || !frag) |
757 | break; | |
758 | ||
759 | skb = frag; | |
760 | frag = skb->next; | |
761 | skb->next = NULL; | |
762 | } | |
763 | ||
a51482bd | 764 | kfree(tmp_hdr); |
1da177e4 LT |
765 | |
766 | if (err == 0) { | |
d8d1f30b | 767 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 768 | IPSTATS_MIB_FRAGOKS); |
d8d1f30b | 769 | dst_release(&rt->dst); |
1da177e4 LT |
770 | return 0; |
771 | } | |
772 | ||
773 | while (frag) { | |
774 | skb = frag->next; | |
775 | kfree_skb(frag); | |
776 | frag = skb; | |
777 | } | |
778 | ||
d8d1f30b | 779 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 780 | IPSTATS_MIB_FRAGFAILS); |
d8d1f30b | 781 | dst_release(&rt->dst); |
1da177e4 | 782 | return err; |
3d13008e ED |
783 | |
784 | slow_path_clean: | |
785 | skb_walk_frags(skb, frag2) { | |
786 | if (frag2 == frag) | |
787 | break; | |
788 | frag2->sk = NULL; | |
789 | frag2->destructor = NULL; | |
790 | skb->truesize += frag2->truesize; | |
791 | } | |
1da177e4 LT |
792 | } |
793 | ||
794 | slow_path: | |
795 | left = skb->len - hlen; /* Space per frame */ | |
796 | ptr = hlen; /* Where to start from */ | |
797 | ||
798 | /* | |
799 | * Fragment the datagram. | |
800 | */ | |
801 | ||
802 | *prevhdr = NEXTHDR_FRAGMENT; | |
803 | ||
804 | /* | |
805 | * Keep copying data until we run out. | |
806 | */ | |
807 | while(left > 0) { | |
808 | len = left; | |
809 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
810 | if (len > mtu) | |
811 | len = mtu; | |
25985edc | 812 | /* IF: we are not sending up to and including the packet end |
1da177e4 LT |
813 | then align the next start on an eight byte boundary */ |
814 | if (len < left) { | |
815 | len &= ~7; | |
816 | } | |
817 | /* | |
818 | * Allocate buffer. | |
819 | */ | |
820 | ||
d8d1f30b | 821 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_ALLOCATED_SPACE(rt->dst.dev), 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); | |
d8d1f30b | 834 | skb_reserve(frag, LL_RESERVED_SPACE(rt->dst.dev)); |
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(); |
69cce1d1 DM |
984 | n = dst_get_neighbour(*dst); |
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) | |
4c9483b2 | 1065 | ipv6_addr_copy(&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) | |
4c9483b2 | 1101 | ipv6_addr_copy(&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) | |
1129 | return -ENOMEM; | |
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; | |
1417 | /* reserve for fragmentation */ | |
1418 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); | |
1419 | ||
a693e698 AB |
1420 | if (sk->sk_type == SOCK_DGRAM) |
1421 | skb_shinfo(skb)->tx_flags = tx_flags; | |
1422 | ||
1da177e4 LT |
1423 | /* |
1424 | * Find where to start putting bytes | |
1425 | */ | |
299b0767 SK |
1426 | data = skb_put(skb, fraglen + dst_exthdrlen); |
1427 | skb_set_network_header(skb, exthdrlen + dst_exthdrlen); | |
1428 | data += fragheaderlen + dst_exthdrlen; | |
b0e380b1 ACM |
1429 | skb->transport_header = (skb->network_header + |
1430 | fragheaderlen); | |
1da177e4 LT |
1431 | if (fraggap) { |
1432 | skb->csum = skb_copy_and_csum_bits( | |
1433 | skb_prev, maxfraglen, | |
1434 | data + transhdrlen, fraggap, 0); | |
1435 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1436 | skb->csum); | |
1437 | data += fraggap; | |
e9fa4f7b | 1438 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1439 | } |
1440 | copy = datalen - transhdrlen - fraggap; | |
299b0767 | 1441 | |
1da177e4 LT |
1442 | if (copy < 0) { |
1443 | err = -EINVAL; | |
1444 | kfree_skb(skb); | |
1445 | goto error; | |
1446 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1447 | err = -EFAULT; | |
1448 | kfree_skb(skb); | |
1449 | goto error; | |
1450 | } | |
1451 | ||
1452 | offset += copy; | |
1453 | length -= datalen - fraggap; | |
1454 | transhdrlen = 0; | |
1455 | exthdrlen = 0; | |
299b0767 | 1456 | dst_exthdrlen = 0; |
1da177e4 LT |
1457 | csummode = CHECKSUM_NONE; |
1458 | ||
1459 | /* | |
1460 | * Put the packet on the pending queue | |
1461 | */ | |
1462 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1463 | continue; | |
1464 | } | |
1465 | ||
1466 | if (copy > length) | |
1467 | copy = length; | |
1468 | ||
d8d1f30b | 1469 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
1da177e4 LT |
1470 | unsigned int off; |
1471 | ||
1472 | off = skb->len; | |
1473 | if (getfrag(from, skb_put(skb, copy), | |
1474 | offset, copy, off, skb) < 0) { | |
1475 | __skb_trim(skb, off); | |
1476 | err = -EFAULT; | |
1477 | goto error; | |
1478 | } | |
1479 | } else { | |
1480 | int i = skb_shinfo(skb)->nr_frags; | |
1481 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | |
1482 | struct page *page = sk->sk_sndmsg_page; | |
1483 | int off = sk->sk_sndmsg_off; | |
1484 | unsigned int left; | |
1485 | ||
1486 | if (page && (left = PAGE_SIZE - off) > 0) { | |
1487 | if (copy >= left) | |
1488 | copy = left; | |
408dadf0 | 1489 | if (page != skb_frag_page(frag)) { |
1da177e4 LT |
1490 | if (i == MAX_SKB_FRAGS) { |
1491 | err = -EMSGSIZE; | |
1492 | goto error; | |
1493 | } | |
1da177e4 | 1494 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); |
408dadf0 | 1495 | skb_frag_ref(skb, i); |
1da177e4 LT |
1496 | frag = &skb_shinfo(skb)->frags[i]; |
1497 | } | |
1498 | } else if(i < MAX_SKB_FRAGS) { | |
1499 | if (copy > PAGE_SIZE) | |
1500 | copy = PAGE_SIZE; | |
1501 | page = alloc_pages(sk->sk_allocation, 0); | |
1502 | if (page == NULL) { | |
1503 | err = -ENOMEM; | |
1504 | goto error; | |
1505 | } | |
1506 | sk->sk_sndmsg_page = page; | |
1507 | sk->sk_sndmsg_off = 0; | |
1508 | ||
1509 | skb_fill_page_desc(skb, i, page, 0, 0); | |
1510 | frag = &skb_shinfo(skb)->frags[i]; | |
1da177e4 LT |
1511 | } else { |
1512 | err = -EMSGSIZE; | |
1513 | goto error; | |
1514 | } | |
9e903e08 ED |
1515 | if (getfrag(from, |
1516 | skb_frag_address(frag) + skb_frag_size(frag), | |
408dadf0 | 1517 | offset, copy, skb->len, skb) < 0) { |
1da177e4 LT |
1518 | err = -EFAULT; |
1519 | goto error; | |
1520 | } | |
1521 | sk->sk_sndmsg_off += copy; | |
9e903e08 | 1522 | skb_frag_size_add(frag, copy); |
1da177e4 LT |
1523 | skb->len += copy; |
1524 | skb->data_len += copy; | |
f945fa7a HX |
1525 | skb->truesize += copy; |
1526 | atomic_add(copy, &sk->sk_wmem_alloc); | |
1da177e4 LT |
1527 | } |
1528 | offset += copy; | |
1529 | length -= copy; | |
1530 | } | |
1531 | return 0; | |
1532 | error: | |
bdc712b4 | 1533 | cork->length -= length; |
3bd653c8 | 1534 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1535 | return err; |
1536 | } | |
1537 | ||
bf138862 PE |
1538 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
1539 | { | |
0178b695 HX |
1540 | if (np->cork.opt) { |
1541 | kfree(np->cork.opt->dst0opt); | |
1542 | kfree(np->cork.opt->dst1opt); | |
1543 | kfree(np->cork.opt->hopopt); | |
1544 | kfree(np->cork.opt->srcrt); | |
1545 | kfree(np->cork.opt); | |
1546 | np->cork.opt = NULL; | |
1547 | } | |
1548 | ||
bdc712b4 DM |
1549 | if (inet->cork.base.dst) { |
1550 | dst_release(inet->cork.base.dst); | |
1551 | inet->cork.base.dst = NULL; | |
1552 | inet->cork.base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 PE |
1553 | } |
1554 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1555 | } | |
1556 | ||
1da177e4 LT |
1557 | int ip6_push_pending_frames(struct sock *sk) |
1558 | { | |
1559 | struct sk_buff *skb, *tmp_skb; | |
1560 | struct sk_buff **tail_skb; | |
1561 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1562 | struct inet_sock *inet = inet_sk(sk); | |
1563 | struct ipv6_pinfo *np = inet6_sk(sk); | |
3bd653c8 | 1564 | struct net *net = sock_net(sk); |
1da177e4 LT |
1565 | struct ipv6hdr *hdr; |
1566 | struct ipv6_txoptions *opt = np->cork.opt; | |
bdc712b4 | 1567 | struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst; |
4c9483b2 DM |
1568 | struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
1569 | unsigned char proto = fl6->flowi6_proto; | |
1da177e4 LT |
1570 | int err = 0; |
1571 | ||
1572 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1573 | goto out; | |
1574 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1575 | ||
1576 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1577 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1578 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1579 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
cfe1fc77 | 1580 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1581 | *tail_skb = tmp_skb; |
1582 | tail_skb = &(tmp_skb->next); | |
1583 | skb->len += tmp_skb->len; | |
1584 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1585 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1586 | tmp_skb->destructor = NULL; |
1587 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1588 | } |
1589 | ||
28a89453 | 1590 | /* Allow local fragmentation. */ |
b5c15fc0 | 1591 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
28a89453 HX |
1592 | skb->local_df = 1; |
1593 | ||
4c9483b2 | 1594 | ipv6_addr_copy(final_dst, &fl6->daddr); |
cfe1fc77 | 1595 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1596 | if (opt && opt->opt_flen) |
1597 | ipv6_push_frag_opts(skb, opt, &proto); | |
1598 | if (opt && opt->opt_nflen) | |
1599 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1600 | ||
e2d1bca7 ACM |
1601 | skb_push(skb, sizeof(struct ipv6hdr)); |
1602 | skb_reset_network_header(skb); | |
0660e03f | 1603 | hdr = ipv6_hdr(skb); |
1ab1457c | 1604 | |
4c9483b2 | 1605 | *(__be32*)hdr = fl6->flowlabel | |
41a1f8ea | 1606 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
1da177e4 | 1607 | |
1da177e4 LT |
1608 | hdr->hop_limit = np->cork.hop_limit; |
1609 | hdr->nexthdr = proto; | |
4c9483b2 | 1610 | ipv6_addr_copy(&hdr->saddr, &fl6->saddr); |
1da177e4 LT |
1611 | ipv6_addr_copy(&hdr->daddr, final_dst); |
1612 | ||
a2c2064f | 1613 | skb->priority = sk->sk_priority; |
4a19ec58 | 1614 | skb->mark = sk->sk_mark; |
a2c2064f | 1615 | |
d8d1f30b | 1616 | skb_dst_set(skb, dst_clone(&rt->dst)); |
edf391ff | 1617 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1618 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1619 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1620 | |
5a57d4c7 | 1621 | ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); |
e41b5368 | 1622 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); |
14878f75 DS |
1623 | } |
1624 | ||
ef76bc23 | 1625 | err = ip6_local_out(skb); |
1da177e4 LT |
1626 | if (err) { |
1627 | if (err > 0) | |
6ce9e7b5 | 1628 | err = net_xmit_errno(err); |
1da177e4 LT |
1629 | if (err) |
1630 | goto error; | |
1631 | } | |
1632 | ||
1633 | out: | |
bf138862 | 1634 | ip6_cork_release(inet, np); |
1da177e4 LT |
1635 | return err; |
1636 | error: | |
06254914 | 1637 | IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1638 | goto out; |
1639 | } | |
1640 | ||
1641 | void ip6_flush_pending_frames(struct sock *sk) | |
1642 | { | |
1da177e4 LT |
1643 | struct sk_buff *skb; |
1644 | ||
1645 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
adf30907 ED |
1646 | if (skb_dst(skb)) |
1647 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1648 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1649 | kfree_skb(skb); |
1650 | } | |
1651 | ||
bf138862 | 1652 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
1da177e4 | 1653 | } |