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 LT |
102 | struct net_device *dev = dst->dev; |
103 | ||
104 | skb->protocol = htons(ETH_P_IPV6); | |
105 | skb->dev = dev; | |
106 | ||
0660e03f | 107 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
adf30907 | 108 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
1da177e4 | 109 | |
7ad6848c | 110 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) && |
d1db275d | 111 | ((mroute6_socket(dev_net(dev), skb) && |
bd91b8bf | 112 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
7bc570c8 YH |
113 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
114 | &ipv6_hdr(skb)->saddr))) { | |
1da177e4 LT |
115 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
116 | ||
117 | /* Do not check for IFF_ALLMULTI; multicast routing | |
118 | is not supported in any case. | |
119 | */ | |
120 | if (newskb) | |
b2e0b385 JE |
121 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
122 | newskb, NULL, newskb->dev, | |
1da177e4 LT |
123 | ip6_dev_loopback_xmit); |
124 | ||
0660e03f | 125 | if (ipv6_hdr(skb)->hop_limit == 0) { |
3bd653c8 DL |
126 | IP6_INC_STATS(dev_net(dev), idev, |
127 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
128 | kfree_skb(skb); |
129 | return 0; | |
130 | } | |
131 | } | |
132 | ||
edf391ff NH |
133 | IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST, |
134 | skb->len); | |
1da177e4 LT |
135 | } |
136 | ||
9e508490 JE |
137 | if (dst->hh) |
138 | return neigh_hh_output(dst->hh, skb); | |
139 | else if (dst->neighbour) | |
140 | return dst->neighbour->output(skb); | |
141 | ||
142 | IP6_INC_STATS_BH(dev_net(dst->dev), | |
143 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
144 | kfree_skb(skb); | |
145 | return -EINVAL; | |
1da177e4 LT |
146 | } |
147 | ||
9e508490 JE |
148 | static int ip6_finish_output(struct sk_buff *skb) |
149 | { | |
150 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || | |
151 | dst_allfrag(skb_dst(skb))) | |
152 | return ip6_fragment(skb, ip6_finish_output2); | |
153 | else | |
154 | return ip6_finish_output2(skb); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | int ip6_output(struct sk_buff *skb) |
158 | { | |
9e508490 | 159 | struct net_device *dev = skb_dst(skb)->dev; |
adf30907 | 160 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
778d80be | 161 | if (unlikely(idev->cnf.disable_ipv6)) { |
9e508490 | 162 | IP6_INC_STATS(dev_net(dev), idev, |
3bd653c8 | 163 | IPSTATS_MIB_OUTDISCARDS); |
778d80be YH |
164 | kfree_skb(skb); |
165 | return 0; | |
166 | } | |
167 | ||
9c6eb28a JE |
168 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev, |
169 | ip6_finish_output, | |
170 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1da177e4 LT |
171 | } |
172 | ||
1da177e4 | 173 | /* |
b5d43998 | 174 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
1da177e4 LT |
175 | */ |
176 | ||
4c9483b2 | 177 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
4e15ed4d | 178 | struct ipv6_txoptions *opt) |
1da177e4 | 179 | { |
3bd653c8 | 180 | struct net *net = sock_net(sk); |
b30bd282 | 181 | struct ipv6_pinfo *np = inet6_sk(sk); |
4c9483b2 | 182 | struct in6_addr *first_hop = &fl6->daddr; |
adf30907 | 183 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 184 | struct ipv6hdr *hdr; |
4c9483b2 | 185 | u8 proto = fl6->flowi6_proto; |
1da177e4 | 186 | int seg_len = skb->len; |
e651f03a GR |
187 | int hlimit = -1; |
188 | int tclass = 0; | |
1da177e4 LT |
189 | u32 mtu; |
190 | ||
191 | if (opt) { | |
c2636b4d | 192 | unsigned int head_room; |
1da177e4 LT |
193 | |
194 | /* First: exthdrs may take lots of space (~8K for now) | |
195 | MAX_HEADER is not enough. | |
196 | */ | |
197 | head_room = opt->opt_nflen + opt->opt_flen; | |
198 | seg_len += head_room; | |
199 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
200 | ||
201 | if (skb_headroom(skb) < head_room) { | |
202 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
a11d206d | 203 | if (skb2 == NULL) { |
adf30907 | 204 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d YH |
205 | IPSTATS_MIB_OUTDISCARDS); |
206 | kfree_skb(skb); | |
1da177e4 LT |
207 | return -ENOBUFS; |
208 | } | |
a11d206d YH |
209 | kfree_skb(skb); |
210 | skb = skb2; | |
83d7eb29 | 211 | skb_set_owner_w(skb, sk); |
1da177e4 LT |
212 | } |
213 | if (opt->opt_flen) | |
214 | ipv6_push_frag_opts(skb, opt, &proto); | |
215 | if (opt->opt_nflen) | |
216 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
217 | } | |
218 | ||
e2d1bca7 ACM |
219 | skb_push(skb, sizeof(struct ipv6hdr)); |
220 | skb_reset_network_header(skb); | |
0660e03f | 221 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
222 | |
223 | /* | |
224 | * Fill in the IPv6 header | |
225 | */ | |
e651f03a GR |
226 | if (np) { |
227 | tclass = np->tclass; | |
1da177e4 | 228 | hlimit = np->hop_limit; |
e651f03a | 229 | } |
1da177e4 | 230 | if (hlimit < 0) |
6b75d090 | 231 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 232 | |
4c9483b2 | 233 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl6->flowlabel; |
41a1f8ea | 234 | |
1da177e4 LT |
235 | hdr->payload_len = htons(seg_len); |
236 | hdr->nexthdr = proto; | |
237 | hdr->hop_limit = hlimit; | |
238 | ||
4c9483b2 | 239 | ipv6_addr_copy(&hdr->saddr, &fl6->saddr); |
1da177e4 LT |
240 | ipv6_addr_copy(&hdr->daddr, first_hop); |
241 | ||
a2c2064f | 242 | skb->priority = sk->sk_priority; |
4a19ec58 | 243 | skb->mark = sk->sk_mark; |
a2c2064f | 244 | |
1da177e4 | 245 | mtu = dst_mtu(dst); |
283d07ac | 246 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
adf30907 | 247 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 248 | IPSTATS_MIB_OUT, skb->len); |
b2e0b385 JE |
249 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
250 | dst->dev, dst_output); | |
1da177e4 LT |
251 | } |
252 | ||
253 | if (net_ratelimit()) | |
254 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); | |
255 | skb->dev = dst->dev; | |
3ffe533c | 256 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 257 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
258 | kfree_skb(skb); |
259 | return -EMSGSIZE; | |
260 | } | |
261 | ||
7159039a YH |
262 | EXPORT_SYMBOL(ip6_xmit); |
263 | ||
1da177e4 LT |
264 | /* |
265 | * To avoid extra problems ND packets are send through this | |
266 | * routine. It's code duplication but I really want to avoid | |
267 | * extra checks since ipv6_build_header is used by TCP (which | |
268 | * is for us performance critical) | |
269 | */ | |
270 | ||
271 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, | |
9acd9f3a | 272 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
1da177e4 LT |
273 | int proto, int len) |
274 | { | |
275 | struct ipv6_pinfo *np = inet6_sk(sk); | |
276 | struct ipv6hdr *hdr; | |
1da177e4 LT |
277 | |
278 | skb->protocol = htons(ETH_P_IPV6); | |
279 | skb->dev = dev; | |
280 | ||
55f79cc0 ACM |
281 | skb_reset_network_header(skb); |
282 | skb_put(skb, sizeof(struct ipv6hdr)); | |
0660e03f | 283 | hdr = ipv6_hdr(skb); |
1da177e4 | 284 | |
ae08e1f0 | 285 | *(__be32*)hdr = htonl(0x60000000); |
1da177e4 LT |
286 | |
287 | hdr->payload_len = htons(len); | |
288 | hdr->nexthdr = proto; | |
289 | hdr->hop_limit = np->hop_limit; | |
290 | ||
291 | ipv6_addr_copy(&hdr->saddr, saddr); | |
292 | ipv6_addr_copy(&hdr->daddr, daddr); | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
298 | { | |
299 | struct ip6_ra_chain *ra; | |
300 | struct sock *last = NULL; | |
301 | ||
302 | read_lock(&ip6_ra_lock); | |
303 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
304 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
305 | if (sk && ra->sel == sel && |
306 | (!sk->sk_bound_dev_if || | |
307 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
308 | if (last) { |
309 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
310 | if (skb2) | |
311 | rawv6_rcv(last, skb2); | |
312 | } | |
313 | last = sk; | |
314 | } | |
315 | } | |
316 | ||
317 | if (last) { | |
318 | rawv6_rcv(last, skb); | |
319 | read_unlock(&ip6_ra_lock); | |
320 | return 1; | |
321 | } | |
322 | read_unlock(&ip6_ra_lock); | |
323 | return 0; | |
324 | } | |
325 | ||
e21e0b5f VN |
326 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
327 | { | |
0660e03f | 328 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f VN |
329 | u8 nexthdr = hdr->nexthdr; |
330 | int offset; | |
331 | ||
332 | if (ipv6_ext_hdr(nexthdr)) { | |
333 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr); | |
334 | if (offset < 0) | |
335 | return 0; | |
336 | } else | |
337 | offset = sizeof(struct ipv6hdr); | |
338 | ||
339 | if (nexthdr == IPPROTO_ICMPV6) { | |
340 | struct icmp6hdr *icmp6; | |
341 | ||
d56f90a7 ACM |
342 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
343 | offset + 1 - skb->data))) | |
e21e0b5f VN |
344 | return 0; |
345 | ||
d56f90a7 | 346 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
347 | |
348 | switch (icmp6->icmp6_type) { | |
349 | case NDISC_ROUTER_SOLICITATION: | |
350 | case NDISC_ROUTER_ADVERTISEMENT: | |
351 | case NDISC_NEIGHBOUR_SOLICITATION: | |
352 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
353 | case NDISC_REDIRECT: | |
354 | /* For reaction involving unicast neighbor discovery | |
355 | * message destined to the proxied address, pass it to | |
356 | * input function. | |
357 | */ | |
358 | return 1; | |
359 | default: | |
360 | break; | |
361 | } | |
362 | } | |
363 | ||
74553b09 VN |
364 | /* |
365 | * The proxying router can't forward traffic sent to a link-local | |
366 | * address, so signal the sender and discard the packet. This | |
367 | * behavior is clarified by the MIPv6 specification. | |
368 | */ | |
369 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
370 | dst_link_failure(skb); | |
371 | return -1; | |
372 | } | |
373 | ||
e21e0b5f VN |
374 | return 0; |
375 | } | |
376 | ||
1da177e4 LT |
377 | static inline int ip6_forward_finish(struct sk_buff *skb) |
378 | { | |
379 | return dst_output(skb); | |
380 | } | |
381 | ||
382 | int ip6_forward(struct sk_buff *skb) | |
383 | { | |
adf30907 | 384 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 385 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 386 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 387 | struct net *net = dev_net(dst->dev); |
14f3ad6f | 388 | u32 mtu; |
1ab1457c | 389 | |
53b7997f | 390 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
391 | goto error; |
392 | ||
4497b076 BH |
393 | if (skb_warn_if_lro(skb)) |
394 | goto drop; | |
395 | ||
1da177e4 | 396 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
3bd653c8 | 397 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
398 | goto drop; |
399 | } | |
400 | ||
72b43d08 AK |
401 | if (skb->pkt_type != PACKET_HOST) |
402 | goto drop; | |
403 | ||
35fc92a9 | 404 | skb_forward_csum(skb); |
1da177e4 LT |
405 | |
406 | /* | |
407 | * We DO NOT make any processing on | |
408 | * RA packets, pushing them to user level AS IS | |
409 | * without ane WARRANTY that application will be able | |
410 | * to interpret them. The reason is that we | |
411 | * cannot make anything clever here. | |
412 | * | |
413 | * We are not end-node, so that if packet contains | |
414 | * AH/ESP, we cannot make anything. | |
415 | * Defragmentation also would be mistake, RA packets | |
416 | * cannot be fragmented, because there is no warranty | |
417 | * that different fragments will go along one path. --ANK | |
418 | */ | |
419 | if (opt->ra) { | |
d56f90a7 | 420 | u8 *ptr = skb_network_header(skb) + opt->ra; |
1da177e4 LT |
421 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
422 | return 0; | |
423 | } | |
424 | ||
425 | /* | |
426 | * check and decrement ttl | |
427 | */ | |
428 | if (hdr->hop_limit <= 1) { | |
429 | /* Force OUTPUT device used as source address */ | |
430 | skb->dev = dst->dev; | |
3ffe533c | 431 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
483a47d2 DL |
432 | IP6_INC_STATS_BH(net, |
433 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1da177e4 LT |
434 | |
435 | kfree_skb(skb); | |
436 | return -ETIMEDOUT; | |
437 | } | |
438 | ||
fbea49e1 | 439 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 440 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 441 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
442 | int proxied = ip6_forward_proxy_check(skb); |
443 | if (proxied > 0) | |
e21e0b5f | 444 | return ip6_input(skb); |
74553b09 | 445 | else if (proxied < 0) { |
3bd653c8 DL |
446 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
447 | IPSTATS_MIB_INDISCARDS); | |
74553b09 VN |
448 | goto drop; |
449 | } | |
e21e0b5f VN |
450 | } |
451 | ||
1da177e4 | 452 | if (!xfrm6_route_forward(skb)) { |
3bd653c8 | 453 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
454 | goto drop; |
455 | } | |
adf30907 | 456 | dst = skb_dst(skb); |
1da177e4 LT |
457 | |
458 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
459 | send redirects to source routed frames. | |
1e5dc146 | 460 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 461 | */ |
1e5dc146 | 462 | if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 && |
def8b4fa | 463 | !skb_sec_path(skb)) { |
1da177e4 LT |
464 | struct in6_addr *target = NULL; |
465 | struct rt6_info *rt; | |
466 | struct neighbour *n = dst->neighbour; | |
467 | ||
468 | /* | |
469 | * incoming and outgoing devices are the same | |
470 | * send a redirect. | |
471 | */ | |
472 | ||
473 | rt = (struct rt6_info *) dst; | |
474 | if ((rt->rt6i_flags & RTF_GATEWAY)) | |
475 | target = (struct in6_addr*)&n->primary_key; | |
476 | else | |
477 | target = &hdr->daddr; | |
478 | ||
92d86829 DM |
479 | if (!rt->rt6i_peer) |
480 | rt6_bind_peer(rt, 1); | |
481 | ||
1da177e4 LT |
482 | /* Limit redirects both by destination (here) |
483 | and by source (inside ndisc_send_redirect) | |
484 | */ | |
92d86829 | 485 | if (inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ)) |
1da177e4 | 486 | ndisc_send_redirect(skb, n, target); |
5bb1ab09 DS |
487 | } else { |
488 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
489 | ||
1da177e4 | 490 | /* This check is security critical. */ |
f81b2e7d YH |
491 | if (addrtype == IPV6_ADDR_ANY || |
492 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
493 | goto error; |
494 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
495 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3ffe533c | 496 | ICMPV6_NOT_NEIGHBOUR, 0); |
5bb1ab09 DS |
497 | goto error; |
498 | } | |
1da177e4 LT |
499 | } |
500 | ||
14f3ad6f UW |
501 | mtu = dst_mtu(dst); |
502 | if (mtu < IPV6_MIN_MTU) | |
503 | mtu = IPV6_MIN_MTU; | |
504 | ||
0aa68271 | 505 | if (skb->len > mtu && !skb_is_gso(skb)) { |
1da177e4 LT |
506 | /* Again, force OUTPUT device used as source address */ |
507 | skb->dev = dst->dev; | |
14f3ad6f | 508 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
483a47d2 DL |
509 | IP6_INC_STATS_BH(net, |
510 | ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); | |
511 | IP6_INC_STATS_BH(net, | |
512 | ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
513 | kfree_skb(skb); |
514 | return -EMSGSIZE; | |
515 | } | |
516 | ||
517 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
3bd653c8 | 518 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
519 | goto drop; |
520 | } | |
521 | ||
0660e03f | 522 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
523 | |
524 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 525 | |
1da177e4 LT |
526 | hdr->hop_limit--; |
527 | ||
483a47d2 | 528 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
b2e0b385 | 529 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
6e23ae2a | 530 | ip6_forward_finish); |
1da177e4 LT |
531 | |
532 | error: | |
483a47d2 | 533 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
534 | drop: |
535 | kfree_skb(skb); | |
536 | return -EINVAL; | |
537 | } | |
538 | ||
539 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
540 | { | |
541 | to->pkt_type = from->pkt_type; | |
542 | to->priority = from->priority; | |
543 | to->protocol = from->protocol; | |
adf30907 ED |
544 | skb_dst_drop(to); |
545 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 546 | to->dev = from->dev; |
82e91ffe | 547 | to->mark = from->mark; |
1da177e4 LT |
548 | |
549 | #ifdef CONFIG_NET_SCHED | |
550 | to->tc_index = from->tc_index; | |
551 | #endif | |
e7ac05f3 | 552 | nf_copy(to, from); |
ba9dda3a JK |
553 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
554 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
555 | to->nf_trace = from->nf_trace; | |
556 | #endif | |
984bc16c | 557 | skb_copy_secmark(to, from); |
1da177e4 LT |
558 | } |
559 | ||
560 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
561 | { | |
562 | u16 offset = sizeof(struct ipv6hdr); | |
0660e03f ACM |
563 | struct ipv6_opt_hdr *exthdr = |
564 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
27a884dc | 565 | unsigned int packet_len = skb->tail - skb->network_header; |
1da177e4 | 566 | int found_rhdr = 0; |
0660e03f | 567 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
1da177e4 LT |
568 | |
569 | while (offset + 1 <= packet_len) { | |
570 | ||
571 | switch (**nexthdr) { | |
572 | ||
573 | case NEXTHDR_HOP: | |
27637df9 | 574 | break; |
1da177e4 | 575 | case NEXTHDR_ROUTING: |
27637df9 MN |
576 | found_rhdr = 1; |
577 | break; | |
1da177e4 | 578 | case NEXTHDR_DEST: |
59fbb3a6 | 579 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
580 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
581 | break; | |
582 | #endif | |
583 | if (found_rhdr) | |
584 | return offset; | |
1da177e4 LT |
585 | break; |
586 | default : | |
587 | return offset; | |
588 | } | |
27637df9 MN |
589 | |
590 | offset += ipv6_optlen(exthdr); | |
591 | *nexthdr = &exthdr->nexthdr; | |
d56f90a7 ACM |
592 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
593 | offset); | |
1da177e4 LT |
594 | } |
595 | ||
596 | return offset; | |
597 | } | |
598 | ||
ad0081e4 | 599 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
1da177e4 | 600 | { |
1da177e4 | 601 | struct sk_buff *frag; |
adf30907 | 602 | struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); |
d91675f9 | 603 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
604 | struct ipv6hdr *tmp_hdr; |
605 | struct frag_hdr *fh; | |
606 | unsigned int mtu, hlen, left, len; | |
ae08e1f0 | 607 | __be32 frag_id = 0; |
1da177e4 LT |
608 | int ptr, offset = 0, err=0; |
609 | u8 *prevhdr, nexthdr = 0; | |
adf30907 | 610 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 611 | |
1da177e4 LT |
612 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
613 | nexthdr = *prevhdr; | |
614 | ||
628a5c56 | 615 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
616 | |
617 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 618 | * or if the skb it not generated by a local socket. |
b881ef76 | 619 | */ |
f2228f78 | 620 | if (!skb->local_df && skb->len > mtu) { |
adf30907 | 621 | skb->dev = skb_dst(skb)->dev; |
3ffe533c | 622 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
adf30907 | 623 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 624 | IPSTATS_MIB_FRAGFAILS); |
b881ef76 JH |
625 | kfree_skb(skb); |
626 | return -EMSGSIZE; | |
627 | } | |
628 | ||
d91675f9 YH |
629 | if (np && np->frag_size < mtu) { |
630 | if (np->frag_size) | |
631 | mtu = np->frag_size; | |
632 | } | |
633 | mtu -= hlen + sizeof(struct frag_hdr); | |
1da177e4 | 634 | |
21dc3301 | 635 | if (skb_has_frag_list(skb)) { |
1da177e4 | 636 | int first_len = skb_pagelen(skb); |
3d13008e | 637 | struct sk_buff *frag2; |
1da177e4 LT |
638 | |
639 | if (first_len - hlen > mtu || | |
640 | ((first_len - hlen) & 7) || | |
641 | skb_cloned(skb)) | |
642 | goto slow_path; | |
643 | ||
4d9092bb | 644 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
645 | /* Correct geometry. */ |
646 | if (frag->len > mtu || | |
647 | ((frag->len & 7) && frag->next) || | |
648 | skb_headroom(frag) < hlen) | |
3d13008e | 649 | goto slow_path_clean; |
1da177e4 | 650 | |
1da177e4 LT |
651 | /* Partially cloned skb? */ |
652 | if (skb_shared(frag)) | |
3d13008e | 653 | goto slow_path_clean; |
2fdba6b0 HX |
654 | |
655 | BUG_ON(frag->sk); | |
656 | if (skb->sk) { | |
2fdba6b0 HX |
657 | frag->sk = skb->sk; |
658 | frag->destructor = sock_wfree; | |
2fdba6b0 | 659 | } |
3d13008e | 660 | skb->truesize -= frag->truesize; |
1da177e4 LT |
661 | } |
662 | ||
663 | err = 0; | |
664 | offset = 0; | |
665 | frag = skb_shinfo(skb)->frag_list; | |
4d9092bb | 666 | skb_frag_list_init(skb); |
1da177e4 LT |
667 | /* BUILD HEADER */ |
668 | ||
9a217a1c | 669 | *prevhdr = NEXTHDR_FRAGMENT; |
d56f90a7 | 670 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
1da177e4 | 671 | if (!tmp_hdr) { |
adf30907 | 672 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 673 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
674 | return -ENOMEM; |
675 | } | |
676 | ||
1da177e4 LT |
677 | __skb_pull(skb, hlen); |
678 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
e2d1bca7 ACM |
679 | __skb_push(skb, hlen); |
680 | skb_reset_network_header(skb); | |
d56f90a7 | 681 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
1da177e4 | 682 | |
7ea2f2c5 | 683 | ipv6_select_ident(fh); |
1da177e4 LT |
684 | fh->nexthdr = nexthdr; |
685 | fh->reserved = 0; | |
686 | fh->frag_off = htons(IP6_MF); | |
687 | frag_id = fh->identification; | |
688 | ||
689 | first_len = skb_pagelen(skb); | |
690 | skb->data_len = first_len - skb_headlen(skb); | |
691 | skb->len = first_len; | |
0660e03f ACM |
692 | ipv6_hdr(skb)->payload_len = htons(first_len - |
693 | sizeof(struct ipv6hdr)); | |
a11d206d | 694 | |
d8d1f30b | 695 | dst_hold(&rt->dst); |
1da177e4 LT |
696 | |
697 | for (;;) { | |
698 | /* Prepare header of the next frame, | |
699 | * before previous one went down. */ | |
700 | if (frag) { | |
701 | frag->ip_summed = CHECKSUM_NONE; | |
badff6d0 | 702 | skb_reset_transport_header(frag); |
1da177e4 | 703 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); |
e2d1bca7 ACM |
704 | __skb_push(frag, hlen); |
705 | skb_reset_network_header(frag); | |
d56f90a7 ACM |
706 | memcpy(skb_network_header(frag), tmp_hdr, |
707 | hlen); | |
1da177e4 LT |
708 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
709 | fh->nexthdr = nexthdr; | |
710 | fh->reserved = 0; | |
711 | fh->frag_off = htons(offset); | |
712 | if (frag->next != NULL) | |
713 | fh->frag_off |= htons(IP6_MF); | |
714 | fh->identification = frag_id; | |
0660e03f ACM |
715 | ipv6_hdr(frag)->payload_len = |
716 | htons(frag->len - | |
717 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
718 | ip6_copy_metadata(frag, skb); |
719 | } | |
1ab1457c | 720 | |
1da177e4 | 721 | err = output(skb); |
dafee490 | 722 | if(!err) |
d8d1f30b | 723 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 724 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 725 | |
1da177e4 LT |
726 | if (err || !frag) |
727 | break; | |
728 | ||
729 | skb = frag; | |
730 | frag = skb->next; | |
731 | skb->next = NULL; | |
732 | } | |
733 | ||
a51482bd | 734 | kfree(tmp_hdr); |
1da177e4 LT |
735 | |
736 | if (err == 0) { | |
d8d1f30b | 737 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 738 | IPSTATS_MIB_FRAGOKS); |
d8d1f30b | 739 | dst_release(&rt->dst); |
1da177e4 LT |
740 | return 0; |
741 | } | |
742 | ||
743 | while (frag) { | |
744 | skb = frag->next; | |
745 | kfree_skb(frag); | |
746 | frag = skb; | |
747 | } | |
748 | ||
d8d1f30b | 749 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 750 | IPSTATS_MIB_FRAGFAILS); |
d8d1f30b | 751 | dst_release(&rt->dst); |
1da177e4 | 752 | return err; |
3d13008e ED |
753 | |
754 | slow_path_clean: | |
755 | skb_walk_frags(skb, frag2) { | |
756 | if (frag2 == frag) | |
757 | break; | |
758 | frag2->sk = NULL; | |
759 | frag2->destructor = NULL; | |
760 | skb->truesize += frag2->truesize; | |
761 | } | |
1da177e4 LT |
762 | } |
763 | ||
764 | slow_path: | |
765 | left = skb->len - hlen; /* Space per frame */ | |
766 | ptr = hlen; /* Where to start from */ | |
767 | ||
768 | /* | |
769 | * Fragment the datagram. | |
770 | */ | |
771 | ||
772 | *prevhdr = NEXTHDR_FRAGMENT; | |
773 | ||
774 | /* | |
775 | * Keep copying data until we run out. | |
776 | */ | |
777 | while(left > 0) { | |
778 | len = left; | |
779 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
780 | if (len > mtu) | |
781 | len = mtu; | |
25985edc | 782 | /* IF: we are not sending up to and including the packet end |
1da177e4 LT |
783 | then align the next start on an eight byte boundary */ |
784 | if (len < left) { | |
785 | len &= ~7; | |
786 | } | |
787 | /* | |
788 | * Allocate buffer. | |
789 | */ | |
790 | ||
d8d1f30b | 791 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_ALLOCATED_SPACE(rt->dst.dev), GFP_ATOMIC)) == NULL) { |
64ce2073 | 792 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
adf30907 | 793 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 794 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
795 | err = -ENOMEM; |
796 | goto fail; | |
797 | } | |
798 | ||
799 | /* | |
800 | * Set up data on packet | |
801 | */ | |
802 | ||
803 | ip6_copy_metadata(frag, skb); | |
d8d1f30b | 804 | skb_reserve(frag, LL_RESERVED_SPACE(rt->dst.dev)); |
1da177e4 | 805 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
c1d2bbe1 | 806 | skb_reset_network_header(frag); |
badff6d0 | 807 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
b0e380b1 ACM |
808 | frag->transport_header = (frag->network_header + hlen + |
809 | sizeof(struct frag_hdr)); | |
1da177e4 LT |
810 | |
811 | /* | |
812 | * Charge the memory for the fragment to any owner | |
813 | * it might possess | |
814 | */ | |
815 | if (skb->sk) | |
816 | skb_set_owner_w(frag, skb->sk); | |
817 | ||
818 | /* | |
819 | * Copy the packet header into the new buffer. | |
820 | */ | |
d626f62b | 821 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
1da177e4 LT |
822 | |
823 | /* | |
824 | * Build fragment header. | |
825 | */ | |
826 | fh->nexthdr = nexthdr; | |
827 | fh->reserved = 0; | |
f36d6ab1 | 828 | if (!frag_id) { |
7ea2f2c5 | 829 | ipv6_select_ident(fh); |
1da177e4 LT |
830 | frag_id = fh->identification; |
831 | } else | |
832 | fh->identification = frag_id; | |
833 | ||
834 | /* | |
835 | * Copy a block of the IP datagram. | |
836 | */ | |
8984e41d | 837 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
1da177e4 LT |
838 | BUG(); |
839 | left -= len; | |
840 | ||
841 | fh->frag_off = htons(offset); | |
842 | if (left > 0) | |
843 | fh->frag_off |= htons(IP6_MF); | |
0660e03f ACM |
844 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
845 | sizeof(struct ipv6hdr)); | |
1da177e4 LT |
846 | |
847 | ptr += len; | |
848 | offset += len; | |
849 | ||
850 | /* | |
851 | * Put this fragment into the sending queue. | |
852 | */ | |
1da177e4 LT |
853 | err = output(frag); |
854 | if (err) | |
855 | goto fail; | |
dafee490 | 856 | |
adf30907 | 857 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 858 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 859 | } |
adf30907 | 860 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 861 | IPSTATS_MIB_FRAGOKS); |
1da177e4 | 862 | kfree_skb(skb); |
1da177e4 LT |
863 | return err; |
864 | ||
865 | fail: | |
adf30907 | 866 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 867 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 868 | kfree_skb(skb); |
1da177e4 LT |
869 | return err; |
870 | } | |
871 | ||
b71d1d42 ED |
872 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
873 | const struct in6_addr *fl_addr, | |
874 | const struct in6_addr *addr_cache) | |
cf6b1982 | 875 | { |
a02cec21 ED |
876 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
877 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)); | |
cf6b1982 YH |
878 | } |
879 | ||
497c615a HX |
880 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
881 | struct dst_entry *dst, | |
b71d1d42 | 882 | const struct flowi6 *fl6) |
1da177e4 | 883 | { |
497c615a HX |
884 | struct ipv6_pinfo *np = inet6_sk(sk); |
885 | struct rt6_info *rt = (struct rt6_info *)dst; | |
1da177e4 | 886 | |
497c615a HX |
887 | if (!dst) |
888 | goto out; | |
889 | ||
890 | /* Yes, checking route validity in not connected | |
891 | * case is not very simple. Take into account, | |
892 | * that we do not support routing by source, TOS, | |
893 | * and MSG_DONTROUTE --ANK (980726) | |
894 | * | |
cf6b1982 YH |
895 | * 1. ip6_rt_check(): If route was host route, |
896 | * check that cached destination is current. | |
497c615a HX |
897 | * If it is network route, we still may |
898 | * check its validity using saved pointer | |
899 | * to the last used address: daddr_cache. | |
900 | * We do not want to save whole address now, | |
901 | * (because main consumer of this service | |
902 | * is tcp, which has not this problem), | |
903 | * so that the last trick works only on connected | |
904 | * sockets. | |
905 | * 2. oif also should be the same. | |
906 | */ | |
4c9483b2 | 907 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
8e1ef0a9 | 908 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 909 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
8e1ef0a9 | 910 | #endif |
4c9483b2 | 911 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) { |
497c615a HX |
912 | dst_release(dst); |
913 | dst = NULL; | |
1da177e4 LT |
914 | } |
915 | ||
497c615a HX |
916 | out: |
917 | return dst; | |
918 | } | |
919 | ||
920 | static int ip6_dst_lookup_tail(struct sock *sk, | |
4c9483b2 | 921 | struct dst_entry **dst, struct flowi6 *fl6) |
497c615a HX |
922 | { |
923 | int err; | |
3b1e0a65 | 924 | struct net *net = sock_net(sk); |
497c615a | 925 | |
1da177e4 | 926 | if (*dst == NULL) |
4c9483b2 | 927 | *dst = ip6_route_output(net, sk, fl6); |
1da177e4 LT |
928 | |
929 | if ((err = (*dst)->error)) | |
930 | goto out_err_release; | |
931 | ||
4c9483b2 | 932 | if (ipv6_addr_any(&fl6->saddr)) { |
c3968a85 DW |
933 | struct rt6_info *rt = (struct rt6_info *) *dst; |
934 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
935 | sk ? inet6_sk(sk)->srcprefs : 0, | |
936 | &fl6->saddr); | |
44456d37 | 937 | if (err) |
1da177e4 | 938 | goto out_err_release; |
1da177e4 LT |
939 | } |
940 | ||
95c385b4 | 941 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
942 | /* |
943 | * Here if the dst entry we've looked up | |
944 | * has a neighbour entry that is in the INCOMPLETE | |
945 | * state and the src address from the flow is | |
946 | * marked as OPTIMISTIC, we release the found | |
947 | * dst entry and replace it instead with the | |
948 | * dst entry of the nexthop router | |
949 | */ | |
950 | if ((*dst)->neighbour && !((*dst)->neighbour->nud_state & NUD_VALID)) { | |
951 | struct inet6_ifaddr *ifp; | |
4c9483b2 | 952 | struct flowi6 fl_gw6; |
e550dfb0 NH |
953 | int redirect; |
954 | ||
4c9483b2 | 955 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
e550dfb0 NH |
956 | (*dst)->dev, 1); |
957 | ||
958 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
959 | if (ifp) | |
960 | in6_ifa_put(ifp); | |
961 | ||
962 | if (redirect) { | |
963 | /* | |
964 | * We need to get the dst entry for the | |
965 | * default router instead | |
966 | */ | |
967 | dst_release(*dst); | |
4c9483b2 DM |
968 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
969 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
970 | *dst = ip6_route_output(net, sk, &fl_gw6); | |
e550dfb0 NH |
971 | if ((err = (*dst)->error)) |
972 | goto out_err_release; | |
95c385b4 | 973 | } |
e550dfb0 | 974 | } |
95c385b4 NH |
975 | #endif |
976 | ||
1da177e4 LT |
977 | return 0; |
978 | ||
979 | out_err_release: | |
ca46f9c8 | 980 | if (err == -ENETUNREACH) |
483a47d2 | 981 | IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
982 | dst_release(*dst); |
983 | *dst = NULL; | |
984 | return err; | |
985 | } | |
34a0b3cd | 986 | |
497c615a HX |
987 | /** |
988 | * ip6_dst_lookup - perform route lookup on flow | |
989 | * @sk: socket which provides route info | |
990 | * @dst: pointer to dst_entry * for result | |
4c9483b2 | 991 | * @fl6: flow to lookup |
497c615a HX |
992 | * |
993 | * This function performs a route lookup on the given flow. | |
994 | * | |
995 | * It returns zero on success, or a standard errno code on error. | |
996 | */ | |
4c9483b2 | 997 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6) |
497c615a HX |
998 | { |
999 | *dst = NULL; | |
4c9483b2 | 1000 | return ip6_dst_lookup_tail(sk, dst, fl6); |
497c615a | 1001 | } |
3cf3dc6c ACM |
1002 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
1003 | ||
497c615a | 1004 | /** |
68d0c6d3 DM |
1005 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
1006 | * @sk: socket which provides route info | |
4c9483b2 | 1007 | * @fl6: flow to lookup |
68d0c6d3 | 1008 | * @final_dst: final destination address for ipsec lookup |
a1414715 | 1009 | * @can_sleep: we are in a sleepable context |
68d0c6d3 DM |
1010 | * |
1011 | * This function performs a route lookup on the given flow. | |
1012 | * | |
1013 | * It returns a valid dst pointer on success, or a pointer encoded | |
1014 | * error code. | |
1015 | */ | |
4c9483b2 | 1016 | struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
68d0c6d3 | 1017 | const struct in6_addr *final_dst, |
a1414715 | 1018 | bool can_sleep) |
68d0c6d3 DM |
1019 | { |
1020 | struct dst_entry *dst = NULL; | |
1021 | int err; | |
1022 | ||
4c9483b2 | 1023 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1024 | if (err) |
1025 | return ERR_PTR(err); | |
1026 | if (final_dst) | |
4c9483b2 | 1027 | ipv6_addr_copy(&fl6->daddr, final_dst); |
2774c131 | 1028 | if (can_sleep) |
4c9483b2 | 1029 | fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; |
2774c131 | 1030 | |
4c9483b2 | 1031 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
68d0c6d3 DM |
1032 | } |
1033 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
1034 | ||
1035 | /** | |
1036 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
497c615a | 1037 | * @sk: socket which provides the dst cache and route info |
4c9483b2 | 1038 | * @fl6: flow to lookup |
68d0c6d3 | 1039 | * @final_dst: final destination address for ipsec lookup |
a1414715 | 1040 | * @can_sleep: we are in a sleepable context |
497c615a HX |
1041 | * |
1042 | * This function performs a route lookup on the given flow with the | |
1043 | * possibility of using the cached route in the socket if it is valid. | |
1044 | * It will take the socket dst lock when operating on the dst cache. | |
1045 | * As a result, this function can only be used in process context. | |
1046 | * | |
68d0c6d3 DM |
1047 | * It returns a valid dst pointer on success, or a pointer encoded |
1048 | * error code. | |
497c615a | 1049 | */ |
4c9483b2 | 1050 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
68d0c6d3 | 1051 | const struct in6_addr *final_dst, |
a1414715 | 1052 | bool can_sleep) |
497c615a | 1053 | { |
68d0c6d3 DM |
1054 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
1055 | int err; | |
497c615a | 1056 | |
4c9483b2 | 1057 | dst = ip6_sk_dst_check(sk, dst, fl6); |
68d0c6d3 | 1058 | |
4c9483b2 | 1059 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
68d0c6d3 DM |
1060 | if (err) |
1061 | return ERR_PTR(err); | |
1062 | if (final_dst) | |
4c9483b2 | 1063 | ipv6_addr_copy(&fl6->daddr, final_dst); |
2774c131 | 1064 | if (can_sleep) |
4c9483b2 | 1065 | fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; |
2774c131 | 1066 | |
4c9483b2 | 1067 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
497c615a | 1068 | } |
68d0c6d3 | 1069 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
497c615a | 1070 | |
34a0b3cd | 1071 | static inline int ip6_ufo_append_data(struct sock *sk, |
e89e9cf5 AR |
1072 | int getfrag(void *from, char *to, int offset, int len, |
1073 | int odd, struct sk_buff *skb), | |
1074 | void *from, int length, int hh_len, int fragheaderlen, | |
1075 | int transhdrlen, int mtu,unsigned int flags) | |
1076 | ||
1077 | { | |
1078 | struct sk_buff *skb; | |
1079 | int err; | |
1080 | ||
1081 | /* There is support for UDP large send offload by network | |
1082 | * device, so create one single skb packet containing complete | |
1083 | * udp datagram | |
1084 | */ | |
1085 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
1086 | skb = sock_alloc_send_skb(sk, | |
1087 | hh_len + fragheaderlen + transhdrlen + 20, | |
1088 | (flags & MSG_DONTWAIT), &err); | |
1089 | if (skb == NULL) | |
1090 | return -ENOMEM; | |
1091 | ||
1092 | /* reserve space for Hardware header */ | |
1093 | skb_reserve(skb, hh_len); | |
1094 | ||
1095 | /* create space for UDP/IP header */ | |
1096 | skb_put(skb,fragheaderlen + transhdrlen); | |
1097 | ||
1098 | /* initialize network header pointer */ | |
c1d2bbe1 | 1099 | skb_reset_network_header(skb); |
e89e9cf5 AR |
1100 | |
1101 | /* initialize protocol header pointer */ | |
b0e380b1 | 1102 | skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf5 | 1103 | |
84fa7933 | 1104 | skb->ip_summed = CHECKSUM_PARTIAL; |
e89e9cf5 | 1105 | skb->csum = 0; |
e89e9cf5 AR |
1106 | } |
1107 | ||
1108 | err = skb_append_datato_frags(sk,skb, getfrag, from, | |
1109 | (length - transhdrlen)); | |
1110 | if (!err) { | |
1111 | struct frag_hdr fhdr; | |
1112 | ||
c31d5326 SS |
1113 | /* Specify the length of each IPv6 datagram fragment. |
1114 | * It has to be a multiple of 8. | |
1115 | */ | |
1116 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - | |
1117 | sizeof(struct frag_hdr)) & ~7; | |
f83ef8c0 | 1118 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
7ea2f2c5 | 1119 | ipv6_select_ident(&fhdr); |
e89e9cf5 AR |
1120 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; |
1121 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | /* There is not enough support do UPD LSO, | |
1126 | * so follow normal path | |
1127 | */ | |
1128 | kfree_skb(skb); | |
1129 | ||
1130 | return err; | |
1131 | } | |
1da177e4 | 1132 | |
0178b695 HX |
1133 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1134 | gfp_t gfp) | |
1135 | { | |
1136 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1137 | } | |
1138 | ||
1139 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1140 | gfp_t gfp) | |
1141 | { | |
1142 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1143 | } | |
1144 | ||
41a1f8ea YH |
1145 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
1146 | int offset, int len, int odd, struct sk_buff *skb), | |
1147 | void *from, int length, int transhdrlen, | |
4c9483b2 | 1148 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, |
13b52cd4 | 1149 | struct rt6_info *rt, unsigned int flags, int dontfrag) |
1da177e4 LT |
1150 | { |
1151 | struct inet_sock *inet = inet_sk(sk); | |
1152 | struct ipv6_pinfo *np = inet6_sk(sk); | |
bdc712b4 | 1153 | struct inet_cork *cork; |
1da177e4 LT |
1154 | struct sk_buff *skb; |
1155 | unsigned int maxfraglen, fragheaderlen; | |
1156 | int exthdrlen; | |
1157 | int hh_len; | |
1158 | int mtu; | |
1159 | int copy; | |
1160 | int err; | |
1161 | int offset = 0; | |
1162 | int csummode = CHECKSUM_NONE; | |
a693e698 | 1163 | __u8 tx_flags = 0; |
1da177e4 LT |
1164 | |
1165 | if (flags&MSG_PROBE) | |
1166 | return 0; | |
bdc712b4 | 1167 | cork = &inet->cork.base; |
1da177e4 LT |
1168 | if (skb_queue_empty(&sk->sk_write_queue)) { |
1169 | /* | |
1170 | * setup for corking | |
1171 | */ | |
1172 | if (opt) { | |
0178b695 | 1173 | if (WARN_ON(np->cork.opt)) |
1da177e4 | 1174 | return -EINVAL; |
0178b695 HX |
1175 | |
1176 | np->cork.opt = kmalloc(opt->tot_len, sk->sk_allocation); | |
1177 | if (unlikely(np->cork.opt == NULL)) | |
1178 | return -ENOBUFS; | |
1179 | ||
1180 | np->cork.opt->tot_len = opt->tot_len; | |
1181 | np->cork.opt->opt_flen = opt->opt_flen; | |
1182 | np->cork.opt->opt_nflen = opt->opt_nflen; | |
1183 | ||
1184 | np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
1185 | sk->sk_allocation); | |
1186 | if (opt->dst0opt && !np->cork.opt->dst0opt) | |
1187 | return -ENOBUFS; | |
1188 | ||
1189 | np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
1190 | sk->sk_allocation); | |
1191 | if (opt->dst1opt && !np->cork.opt->dst1opt) | |
1192 | return -ENOBUFS; | |
1193 | ||
1194 | np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt, | |
1195 | sk->sk_allocation); | |
1196 | if (opt->hopopt && !np->cork.opt->hopopt) | |
1197 | return -ENOBUFS; | |
1198 | ||
1199 | np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
1200 | sk->sk_allocation); | |
1201 | if (opt->srcrt && !np->cork.opt->srcrt) | |
1202 | return -ENOBUFS; | |
1203 | ||
1da177e4 LT |
1204 | /* need source address above miyazawa*/ |
1205 | } | |
d8d1f30b | 1206 | dst_hold(&rt->dst); |
bdc712b4 | 1207 | cork->dst = &rt->dst; |
4c9483b2 | 1208 | inet->cork.fl.u.ip6 = *fl6; |
1da177e4 | 1209 | np->cork.hop_limit = hlimit; |
41a1f8ea | 1210 | np->cork.tclass = tclass; |
628a5c56 | 1211 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? |
d8d1f30b | 1212 | rt->dst.dev->mtu : dst_mtu(rt->dst.path); |
c7503609 | 1213 | if (np->frag_size < mtu) { |
d91675f9 YH |
1214 | if (np->frag_size) |
1215 | mtu = np->frag_size; | |
1216 | } | |
bdc712b4 | 1217 | cork->fragsize = mtu; |
d8d1f30b | 1218 | if (dst_allfrag(rt->dst.path)) |
bdc712b4 DM |
1219 | cork->flags |= IPCORK_ALLFRAG; |
1220 | cork->length = 0; | |
1da177e4 LT |
1221 | sk->sk_sndmsg_page = NULL; |
1222 | sk->sk_sndmsg_off = 0; | |
d8d1f30b | 1223 | exthdrlen = rt->dst.header_len + (opt ? opt->opt_flen : 0) - |
a1b05140 | 1224 | rt->rt6i_nfheader_len; |
1da177e4 LT |
1225 | length += exthdrlen; |
1226 | transhdrlen += exthdrlen; | |
1227 | } else { | |
bdc712b4 | 1228 | rt = (struct rt6_info *)cork->dst; |
4c9483b2 | 1229 | fl6 = &inet->cork.fl.u.ip6; |
0178b695 | 1230 | opt = np->cork.opt; |
1da177e4 LT |
1231 | transhdrlen = 0; |
1232 | exthdrlen = 0; | |
bdc712b4 | 1233 | mtu = cork->fragsize; |
1da177e4 LT |
1234 | } |
1235 | ||
d8d1f30b | 1236 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4 | 1237 | |
a1b05140 | 1238 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1239 | (opt ? opt->opt_nflen : 0); |
1da177e4 LT |
1240 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); |
1241 | ||
1242 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
bdc712b4 | 1243 | if (cork->length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { |
4c9483b2 | 1244 | ipv6_local_error(sk, EMSGSIZE, fl6, mtu-exthdrlen); |
1da177e4 LT |
1245 | return -EMSGSIZE; |
1246 | } | |
1247 | } | |
1248 | ||
a693e698 AB |
1249 | /* For UDP, check if TX timestamp is enabled */ |
1250 | if (sk->sk_type == SOCK_DGRAM) { | |
1251 | err = sock_tx_timestamp(sk, &tx_flags); | |
1252 | if (err) | |
1253 | goto error; | |
1254 | } | |
1255 | ||
1da177e4 LT |
1256 | /* |
1257 | * Let's try using as much space as possible. | |
1258 | * Use MTU if total length of the message fits into the MTU. | |
1259 | * Otherwise, we need to reserve fragment header and | |
1260 | * fragment alignment (= 8-15 octects, in total). | |
1261 | * | |
1262 | * Note that we may need to "move" the data from the tail of | |
1ab1457c | 1263 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1264 | * the message. |
1265 | * | |
1ab1457c | 1266 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1267 | * at once if non-fragmentable extension headers |
1268 | * are too large. | |
1ab1457c | 1269 | * --yoshfuji |
1da177e4 LT |
1270 | */ |
1271 | ||
bdc712b4 | 1272 | cork->length += length; |
4b340ae2 BH |
1273 | if (length > mtu) { |
1274 | int proto = sk->sk_protocol; | |
1275 | if (dontfrag && (proto == IPPROTO_UDP || proto == IPPROTO_RAW)){ | |
4c9483b2 | 1276 | ipv6_local_rxpmtu(sk, fl6, mtu-exthdrlen); |
4b340ae2 BH |
1277 | return -EMSGSIZE; |
1278 | } | |
e89e9cf5 | 1279 | |
4b340ae2 | 1280 | if (proto == IPPROTO_UDP && |
d8d1f30b | 1281 | (rt->dst.dev->features & NETIF_F_UFO)) { |
4b340ae2 BH |
1282 | |
1283 | err = ip6_ufo_append_data(sk, getfrag, from, length, | |
1284 | hh_len, fragheaderlen, | |
1285 | transhdrlen, mtu, flags); | |
1286 | if (err) | |
1287 | goto error; | |
1288 | return 0; | |
1289 | } | |
e89e9cf5 | 1290 | } |
1da177e4 LT |
1291 | |
1292 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) | |
1293 | goto alloc_new_skb; | |
1294 | ||
1295 | while (length > 0) { | |
1296 | /* Check if the remaining data fits into current packet. */ | |
bdc712b4 | 1297 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
1da177e4 LT |
1298 | if (copy < length) |
1299 | copy = maxfraglen - skb->len; | |
1300 | ||
1301 | if (copy <= 0) { | |
1302 | char *data; | |
1303 | unsigned int datalen; | |
1304 | unsigned int fraglen; | |
1305 | unsigned int fraggap; | |
1306 | unsigned int alloclen; | |
1307 | struct sk_buff *skb_prev; | |
1308 | alloc_new_skb: | |
1309 | skb_prev = skb; | |
1310 | ||
1311 | /* There's no room in the current skb */ | |
1312 | if (skb_prev) | |
1313 | fraggap = skb_prev->len - maxfraglen; | |
1314 | else | |
1315 | fraggap = 0; | |
1316 | ||
1317 | /* | |
1318 | * If remaining data exceeds the mtu, | |
1319 | * we know we need more fragment(s). | |
1320 | */ | |
1321 | datalen = length + fraggap; | |
bdc712b4 | 1322 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
1da177e4 LT |
1323 | datalen = maxfraglen - fragheaderlen; |
1324 | ||
1325 | fraglen = datalen + fragheaderlen; | |
1326 | if ((flags & MSG_MORE) && | |
d8d1f30b | 1327 | !(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4 LT |
1328 | alloclen = mtu; |
1329 | else | |
1330 | alloclen = datalen + fragheaderlen; | |
1331 | ||
1332 | /* | |
1333 | * The last fragment gets additional space at tail. | |
1334 | * Note: we overallocate on fragments with MSG_MODE | |
1335 | * because we have no idea if we're the last one. | |
1336 | */ | |
1337 | if (datalen == length + fraggap) | |
d8d1f30b | 1338 | alloclen += rt->dst.trailer_len; |
1da177e4 LT |
1339 | |
1340 | /* | |
1341 | * We just reserve space for fragment header. | |
1ab1457c | 1342 | * Note: this may be overallocation if the message |
1da177e4 LT |
1343 | * (without MSG_MORE) fits into the MTU. |
1344 | */ | |
1345 | alloclen += sizeof(struct frag_hdr); | |
1346 | ||
1347 | if (transhdrlen) { | |
1348 | skb = sock_alloc_send_skb(sk, | |
1349 | alloclen + hh_len, | |
1350 | (flags & MSG_DONTWAIT), &err); | |
1351 | } else { | |
1352 | skb = NULL; | |
1353 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1354 | 2 * sk->sk_sndbuf) | |
1355 | skb = sock_wmalloc(sk, | |
1356 | alloclen + hh_len, 1, | |
1357 | sk->sk_allocation); | |
1358 | if (unlikely(skb == NULL)) | |
1359 | err = -ENOBUFS; | |
a693e698 AB |
1360 | else { |
1361 | /* Only the initial fragment | |
1362 | * is time stamped. | |
1363 | */ | |
1364 | tx_flags = 0; | |
1365 | } | |
1da177e4 LT |
1366 | } |
1367 | if (skb == NULL) | |
1368 | goto error; | |
1369 | /* | |
1370 | * Fill in the control structures | |
1371 | */ | |
1372 | skb->ip_summed = csummode; | |
1373 | skb->csum = 0; | |
1374 | /* reserve for fragmentation */ | |
1375 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); | |
1376 | ||
a693e698 AB |
1377 | if (sk->sk_type == SOCK_DGRAM) |
1378 | skb_shinfo(skb)->tx_flags = tx_flags; | |
1379 | ||
1da177e4 LT |
1380 | /* |
1381 | * Find where to start putting bytes | |
1382 | */ | |
1383 | data = skb_put(skb, fraglen); | |
c14d2450 | 1384 | skb_set_network_header(skb, exthdrlen); |
1da177e4 | 1385 | data += fragheaderlen; |
b0e380b1 ACM |
1386 | skb->transport_header = (skb->network_header + |
1387 | fragheaderlen); | |
1da177e4 LT |
1388 | if (fraggap) { |
1389 | skb->csum = skb_copy_and_csum_bits( | |
1390 | skb_prev, maxfraglen, | |
1391 | data + transhdrlen, fraggap, 0); | |
1392 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1393 | skb->csum); | |
1394 | data += fraggap; | |
e9fa4f7b | 1395 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 LT |
1396 | } |
1397 | copy = datalen - transhdrlen - fraggap; | |
1398 | if (copy < 0) { | |
1399 | err = -EINVAL; | |
1400 | kfree_skb(skb); | |
1401 | goto error; | |
1402 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1403 | err = -EFAULT; | |
1404 | kfree_skb(skb); | |
1405 | goto error; | |
1406 | } | |
1407 | ||
1408 | offset += copy; | |
1409 | length -= datalen - fraggap; | |
1410 | transhdrlen = 0; | |
1411 | exthdrlen = 0; | |
1412 | csummode = CHECKSUM_NONE; | |
1413 | ||
1414 | /* | |
1415 | * Put the packet on the pending queue | |
1416 | */ | |
1417 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1418 | continue; | |
1419 | } | |
1420 | ||
1421 | if (copy > length) | |
1422 | copy = length; | |
1423 | ||
d8d1f30b | 1424 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
1da177e4 LT |
1425 | unsigned int off; |
1426 | ||
1427 | off = skb->len; | |
1428 | if (getfrag(from, skb_put(skb, copy), | |
1429 | offset, copy, off, skb) < 0) { | |
1430 | __skb_trim(skb, off); | |
1431 | err = -EFAULT; | |
1432 | goto error; | |
1433 | } | |
1434 | } else { | |
1435 | int i = skb_shinfo(skb)->nr_frags; | |
1436 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | |
1437 | struct page *page = sk->sk_sndmsg_page; | |
1438 | int off = sk->sk_sndmsg_off; | |
1439 | unsigned int left; | |
1440 | ||
1441 | if (page && (left = PAGE_SIZE - off) > 0) { | |
1442 | if (copy >= left) | |
1443 | copy = left; | |
1444 | if (page != frag->page) { | |
1445 | if (i == MAX_SKB_FRAGS) { | |
1446 | err = -EMSGSIZE; | |
1447 | goto error; | |
1448 | } | |
1449 | get_page(page); | |
1450 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); | |
1451 | frag = &skb_shinfo(skb)->frags[i]; | |
1452 | } | |
1453 | } else if(i < MAX_SKB_FRAGS) { | |
1454 | if (copy > PAGE_SIZE) | |
1455 | copy = PAGE_SIZE; | |
1456 | page = alloc_pages(sk->sk_allocation, 0); | |
1457 | if (page == NULL) { | |
1458 | err = -ENOMEM; | |
1459 | goto error; | |
1460 | } | |
1461 | sk->sk_sndmsg_page = page; | |
1462 | sk->sk_sndmsg_off = 0; | |
1463 | ||
1464 | skb_fill_page_desc(skb, i, page, 0, 0); | |
1465 | frag = &skb_shinfo(skb)->frags[i]; | |
1da177e4 LT |
1466 | } else { |
1467 | err = -EMSGSIZE; | |
1468 | goto error; | |
1469 | } | |
1470 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { | |
1471 | err = -EFAULT; | |
1472 | goto error; | |
1473 | } | |
1474 | sk->sk_sndmsg_off += copy; | |
1475 | frag->size += copy; | |
1476 | skb->len += copy; | |
1477 | skb->data_len += copy; | |
f945fa7a HX |
1478 | skb->truesize += copy; |
1479 | atomic_add(copy, &sk->sk_wmem_alloc); | |
1da177e4 LT |
1480 | } |
1481 | offset += copy; | |
1482 | length -= copy; | |
1483 | } | |
1484 | return 0; | |
1485 | error: | |
bdc712b4 | 1486 | cork->length -= length; |
3bd653c8 | 1487 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1488 | return err; |
1489 | } | |
1490 | ||
bf138862 PE |
1491 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
1492 | { | |
0178b695 HX |
1493 | if (np->cork.opt) { |
1494 | kfree(np->cork.opt->dst0opt); | |
1495 | kfree(np->cork.opt->dst1opt); | |
1496 | kfree(np->cork.opt->hopopt); | |
1497 | kfree(np->cork.opt->srcrt); | |
1498 | kfree(np->cork.opt); | |
1499 | np->cork.opt = NULL; | |
1500 | } | |
1501 | ||
bdc712b4 DM |
1502 | if (inet->cork.base.dst) { |
1503 | dst_release(inet->cork.base.dst); | |
1504 | inet->cork.base.dst = NULL; | |
1505 | inet->cork.base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 PE |
1506 | } |
1507 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1508 | } | |
1509 | ||
1da177e4 LT |
1510 | int ip6_push_pending_frames(struct sock *sk) |
1511 | { | |
1512 | struct sk_buff *skb, *tmp_skb; | |
1513 | struct sk_buff **tail_skb; | |
1514 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1515 | struct inet_sock *inet = inet_sk(sk); | |
1516 | struct ipv6_pinfo *np = inet6_sk(sk); | |
3bd653c8 | 1517 | struct net *net = sock_net(sk); |
1da177e4 LT |
1518 | struct ipv6hdr *hdr; |
1519 | struct ipv6_txoptions *opt = np->cork.opt; | |
bdc712b4 | 1520 | struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst; |
4c9483b2 DM |
1521 | struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
1522 | unsigned char proto = fl6->flowi6_proto; | |
1da177e4 LT |
1523 | int err = 0; |
1524 | ||
1525 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1526 | goto out; | |
1527 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1528 | ||
1529 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1530 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1531 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1532 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
cfe1fc77 | 1533 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1534 | *tail_skb = tmp_skb; |
1535 | tail_skb = &(tmp_skb->next); | |
1536 | skb->len += tmp_skb->len; | |
1537 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1538 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1539 | tmp_skb->destructor = NULL; |
1540 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1541 | } |
1542 | ||
28a89453 | 1543 | /* Allow local fragmentation. */ |
b5c15fc0 | 1544 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
28a89453 HX |
1545 | skb->local_df = 1; |
1546 | ||
4c9483b2 | 1547 | ipv6_addr_copy(final_dst, &fl6->daddr); |
cfe1fc77 | 1548 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1549 | if (opt && opt->opt_flen) |
1550 | ipv6_push_frag_opts(skb, opt, &proto); | |
1551 | if (opt && opt->opt_nflen) | |
1552 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1553 | ||
e2d1bca7 ACM |
1554 | skb_push(skb, sizeof(struct ipv6hdr)); |
1555 | skb_reset_network_header(skb); | |
0660e03f | 1556 | hdr = ipv6_hdr(skb); |
1ab1457c | 1557 | |
4c9483b2 | 1558 | *(__be32*)hdr = fl6->flowlabel | |
41a1f8ea | 1559 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
1da177e4 | 1560 | |
1da177e4 LT |
1561 | hdr->hop_limit = np->cork.hop_limit; |
1562 | hdr->nexthdr = proto; | |
4c9483b2 | 1563 | ipv6_addr_copy(&hdr->saddr, &fl6->saddr); |
1da177e4 LT |
1564 | ipv6_addr_copy(&hdr->daddr, final_dst); |
1565 | ||
a2c2064f | 1566 | skb->priority = sk->sk_priority; |
4a19ec58 | 1567 | skb->mark = sk->sk_mark; |
a2c2064f | 1568 | |
d8d1f30b | 1569 | skb_dst_set(skb, dst_clone(&rt->dst)); |
edf391ff | 1570 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1571 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1572 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1573 | |
5a57d4c7 | 1574 | ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); |
e41b5368 | 1575 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); |
14878f75 DS |
1576 | } |
1577 | ||
ef76bc23 | 1578 | err = ip6_local_out(skb); |
1da177e4 LT |
1579 | if (err) { |
1580 | if (err > 0) | |
6ce9e7b5 | 1581 | err = net_xmit_errno(err); |
1da177e4 LT |
1582 | if (err) |
1583 | goto error; | |
1584 | } | |
1585 | ||
1586 | out: | |
bf138862 | 1587 | ip6_cork_release(inet, np); |
1da177e4 LT |
1588 | return err; |
1589 | error: | |
06254914 | 1590 | IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1591 | goto out; |
1592 | } | |
1593 | ||
1594 | void ip6_flush_pending_frames(struct sock *sk) | |
1595 | { | |
1da177e4 LT |
1596 | struct sk_buff *skb; |
1597 | ||
1598 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
adf30907 ED |
1599 | if (skb_dst(skb)) |
1600 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1601 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1602 | kfree_skb(skb); |
1603 | } | |
1604 | ||
bf138862 | 1605 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
1da177e4 | 1606 | } |