Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * IPv6 output functions | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 8 | * |
1da177e4 LT |
9 | * Based on linux/net/ipv4/ip_output.c |
10 | * | |
1da177e4 LT |
11 | * Changes: |
12 | * A.N.Kuznetsov : airthmetics in fragmentation. | |
13 | * extension headers are implemented. | |
14 | * route changes now work. | |
15 | * ip6_forward does not confuse sniffers. | |
16 | * etc. | |
17 | * | |
18 | * H. von Brand : Added missing #include <linux/string.h> | |
67ba4152 | 19 | * Imran Patel : frag id should be in NBO |
1da177e4 LT |
20 | * Kazunori MIYAZAWA @USAGI |
21 | * : add ip6_append_data and related functions | |
22 | * for datagram xmit | |
23 | */ | |
24 | ||
1da177e4 | 25 | #include <linux/errno.h> |
ef76bc23 | 26 | #include <linux/kernel.h> |
1da177e4 LT |
27 | #include <linux/string.h> |
28 | #include <linux/socket.h> | |
29 | #include <linux/net.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/in6.h> | |
33 | #include <linux/tcp.h> | |
34 | #include <linux/route.h> | |
b59f45d0 | 35 | #include <linux/module.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 | 37 | |
33b48679 | 38 | #include <linux/bpf-cgroup.h> |
1da177e4 LT |
39 | #include <linux/netfilter.h> |
40 | #include <linux/netfilter_ipv6.h> | |
41 | ||
42 | #include <net/sock.h> | |
43 | #include <net/snmp.h> | |
44 | ||
45 | #include <net/ipv6.h> | |
46 | #include <net/ndisc.h> | |
47 | #include <net/protocol.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/addrconf.h> | |
50 | #include <net/rawv6.h> | |
51 | #include <net/icmp.h> | |
52 | #include <net/xfrm.h> | |
53 | #include <net/checksum.h> | |
7bc570c8 | 54 | #include <linux/mroute6.h> |
ca254490 | 55 | #include <net/l3mdev.h> |
14972cbd | 56 | #include <net/lwtunnel.h> |
571912c6 | 57 | #include <net/ip_tunnels.h> |
1da177e4 | 58 | |
7d8c6e39 | 59 | static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 60 | { |
adf30907 | 61 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 62 | struct net_device *dev = dst->dev; |
9b1c1ef1 | 63 | const struct in6_addr *nexthop; |
f6b72b62 | 64 | struct neighbour *neigh; |
6fd6ce20 | 65 | int ret; |
1da177e4 | 66 | |
0660e03f | 67 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
adf30907 | 68 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
1da177e4 | 69 | |
7026b1dd | 70 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) && |
8571ab47 | 71 | ((mroute6_is_socket(net, skb) && |
bd91b8bf | 72 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
7bc570c8 YH |
73 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
74 | &ipv6_hdr(skb)->saddr))) { | |
1da177e4 LT |
75 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
76 | ||
77 | /* Do not check for IFF_ALLMULTI; multicast routing | |
78 | is not supported in any case. | |
79 | */ | |
80 | if (newskb) | |
b2e0b385 | 81 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
29a26a56 | 82 | net, sk, newskb, NULL, newskb->dev, |
95603e22 | 83 | dev_loopback_xmit); |
1da177e4 | 84 | |
0660e03f | 85 | if (ipv6_hdr(skb)->hop_limit == 0) { |
78126c41 | 86 | IP6_INC_STATS(net, idev, |
3bd653c8 | 87 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
88 | kfree_skb(skb); |
89 | return 0; | |
90 | } | |
91 | } | |
92 | ||
78126c41 | 93 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len); |
dd408515 HFS |
94 | |
95 | if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <= | |
96 | IPV6_ADDR_SCOPE_NODELOCAL && | |
97 | !(dev->flags & IFF_LOOPBACK)) { | |
98 | kfree_skb(skb); | |
99 | return 0; | |
100 | } | |
1da177e4 LT |
101 | } |
102 | ||
14972cbd RP |
103 | if (lwtunnel_xmit_redirect(dst->lwtstate)) { |
104 | int res = lwtunnel_xmit(skb); | |
105 | ||
106 | if (res < 0 || res == LWTUNNEL_XMIT_DONE) | |
107 | return res; | |
108 | } | |
109 | ||
6fd6ce20 | 110 | rcu_read_lock_bh(); |
2647a9b0 | 111 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); |
6fd6ce20 YH |
112 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); |
113 | if (unlikely(!neigh)) | |
114 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
115 | if (!IS_ERR(neigh)) { | |
4ff06203 | 116 | sock_confirm_neigh(skb, neigh); |
0353f282 | 117 | ret = neigh_output(neigh, skb, false); |
6fd6ce20 YH |
118 | rcu_read_unlock_bh(); |
119 | return ret; | |
120 | } | |
121 | rcu_read_unlock_bh(); | |
05e3aa09 | 122 | |
78126c41 | 123 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
9e508490 JE |
124 | kfree_skb(skb); |
125 | return -EINVAL; | |
1da177e4 LT |
126 | } |
127 | ||
b210de4f AL |
128 | static int |
129 | ip6_finish_output_gso_slowpath_drop(struct net *net, struct sock *sk, | |
130 | struct sk_buff *skb, unsigned int mtu) | |
131 | { | |
132 | struct sk_buff *segs, *nskb; | |
133 | netdev_features_t features; | |
134 | int ret = 0; | |
135 | ||
136 | /* Please see corresponding comment in ip_finish_output_gso | |
137 | * describing the cases where GSO segment length exceeds the | |
138 | * egress MTU. | |
139 | */ | |
140 | features = netif_skb_features(skb); | |
141 | segs = skb_gso_segment(skb, features & ~NETIF_F_GSO_MASK); | |
142 | if (IS_ERR_OR_NULL(segs)) { | |
143 | kfree_skb(skb); | |
144 | return -ENOMEM; | |
145 | } | |
146 | ||
147 | consume_skb(skb); | |
148 | ||
149 | skb_list_walk_safe(segs, segs, nskb) { | |
150 | int err; | |
151 | ||
152 | skb_mark_not_on_list(segs); | |
153 | err = ip6_fragment(net, sk, segs, ip6_finish_output2); | |
154 | if (err && ret == 0) | |
155 | ret = err; | |
156 | } | |
157 | ||
158 | return ret; | |
159 | } | |
160 | ||
956fe219 | 161 | static int __ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
9e508490 | 162 | { |
b210de4f AL |
163 | unsigned int mtu; |
164 | ||
09ee9dba TB |
165 | #if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM) |
166 | /* Policy lookup after SNAT yielded a new policy */ | |
167 | if (skb_dst(skb)->xfrm) { | |
168 | IPCB(skb)->flags |= IPSKB_REROUTED; | |
169 | return dst_output(net, sk, skb); | |
170 | } | |
171 | #endif | |
172 | ||
b210de4f AL |
173 | mtu = ip6_skb_dst_mtu(skb); |
174 | if (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu)) | |
175 | return ip6_finish_output_gso_slowpath_drop(net, sk, skb, mtu); | |
176 | ||
177 | if ((skb->len > mtu && !skb_is_gso(skb)) || | |
9037c357 JP |
178 | dst_allfrag(skb_dst(skb)) || |
179 | (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size)) | |
7d8c6e39 | 180 | return ip6_fragment(net, sk, skb, ip6_finish_output2); |
9e508490 | 181 | else |
7d8c6e39 | 182 | return ip6_finish_output2(net, sk, skb); |
9e508490 JE |
183 | } |
184 | ||
956fe219 | 185 | static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
186 | { | |
187 | int ret; | |
188 | ||
189 | ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb); | |
190 | switch (ret) { | |
191 | case NET_XMIT_SUCCESS: | |
192 | return __ip6_finish_output(net, sk, skb); | |
193 | case NET_XMIT_CN: | |
194 | return __ip6_finish_output(net, sk, skb) ? : ret; | |
195 | default: | |
196 | kfree_skb(skb); | |
197 | return ret; | |
198 | } | |
199 | } | |
200 | ||
ede2059d | 201 | int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 202 | { |
28f8bfd1 | 203 | struct net_device *dev = skb_dst(skb)->dev, *indev = skb->dev; |
adf30907 | 204 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
be10de0a | 205 | |
97a7a37a CF |
206 | skb->protocol = htons(ETH_P_IPV6); |
207 | skb->dev = dev; | |
208 | ||
778d80be | 209 | if (unlikely(idev->cnf.disable_ipv6)) { |
19a0644c | 210 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
778d80be YH |
211 | kfree_skb(skb); |
212 | return 0; | |
213 | } | |
214 | ||
29a26a56 | 215 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
28f8bfd1 | 216 | net, sk, skb, indev, dev, |
9c6eb28a JE |
217 | ip6_finish_output, |
218 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1da177e4 | 219 | } |
6585d7dc | 220 | EXPORT_SYMBOL(ip6_output); |
1da177e4 | 221 | |
e9191ffb | 222 | bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np) |
513674b5 SL |
223 | { |
224 | if (!np->autoflowlabel_set) | |
225 | return ip6_default_np_autolabel(net); | |
226 | else | |
227 | return np->autoflowlabel; | |
228 | } | |
229 | ||
1da177e4 | 230 | /* |
1c1e9d2b ED |
231 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
232 | * Note : socket lock is not held for SYNACK packets, but might be modified | |
233 | * by calls to skb_set_owner_w() and ipv6_local_error(), | |
234 | * which are using proper atomic operations or spinlocks. | |
1da177e4 | 235 | */ |
1c1e9d2b | 236 | int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
4f6570d7 | 237 | __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority) |
1da177e4 | 238 | { |
3bd653c8 | 239 | struct net *net = sock_net(sk); |
1c1e9d2b | 240 | const struct ipv6_pinfo *np = inet6_sk(sk); |
4c9483b2 | 241 | struct in6_addr *first_hop = &fl6->daddr; |
adf30907 | 242 | struct dst_entry *dst = skb_dst(skb); |
66033f47 | 243 | unsigned int head_room; |
1da177e4 | 244 | struct ipv6hdr *hdr; |
4c9483b2 | 245 | u8 proto = fl6->flowi6_proto; |
1da177e4 | 246 | int seg_len = skb->len; |
e651f03a | 247 | int hlimit = -1; |
1da177e4 LT |
248 | u32 mtu; |
249 | ||
66033f47 SB |
250 | head_room = sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); |
251 | if (opt) | |
252 | head_room += opt->opt_nflen + opt->opt_flen; | |
253 | ||
254 | if (unlikely(skb_headroom(skb) < head_room)) { | |
255 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
256 | if (!skb2) { | |
257 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
258 | IPSTATS_MIB_OUTDISCARDS); | |
259 | kfree_skb(skb); | |
260 | return -ENOBUFS; | |
1da177e4 | 261 | } |
66033f47 SB |
262 | if (skb->sk) |
263 | skb_set_owner_w(skb2, skb->sk); | |
264 | consume_skb(skb); | |
265 | skb = skb2; | |
266 | } | |
267 | ||
268 | if (opt) { | |
269 | seg_len += opt->opt_nflen + opt->opt_flen; | |
270 | ||
1da177e4 LT |
271 | if (opt->opt_flen) |
272 | ipv6_push_frag_opts(skb, opt, &proto); | |
66033f47 | 273 | |
1da177e4 | 274 | if (opt->opt_nflen) |
613fa3ca DL |
275 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop, |
276 | &fl6->saddr); | |
1da177e4 LT |
277 | } |
278 | ||
e2d1bca7 ACM |
279 | skb_push(skb, sizeof(struct ipv6hdr)); |
280 | skb_reset_network_header(skb); | |
0660e03f | 281 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
282 | |
283 | /* | |
284 | * Fill in the IPv6 header | |
285 | */ | |
b903d324 | 286 | if (np) |
1da177e4 LT |
287 | hlimit = np->hop_limit; |
288 | if (hlimit < 0) | |
6b75d090 | 289 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 290 | |
cb1ce2ef | 291 | ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel, |
513674b5 | 292 | ip6_autoflowlabel(net, np), fl6)); |
41a1f8ea | 293 | |
1da177e4 LT |
294 | hdr->payload_len = htons(seg_len); |
295 | hdr->nexthdr = proto; | |
296 | hdr->hop_limit = hlimit; | |
297 | ||
4e3fd7a0 AD |
298 | hdr->saddr = fl6->saddr; |
299 | hdr->daddr = *first_hop; | |
1da177e4 | 300 | |
9c9c9ad5 | 301 | skb->protocol = htons(ETH_P_IPV6); |
4f6570d7 | 302 | skb->priority = priority; |
92e55f41 | 303 | skb->mark = mark; |
a2c2064f | 304 | |
1da177e4 | 305 | mtu = dst_mtu(dst); |
60ff7467 | 306 | if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) { |
adf30907 | 307 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
edf391ff | 308 | IPSTATS_MIB_OUT, skb->len); |
a8e3e1a9 DA |
309 | |
310 | /* if egress device is enslaved to an L3 master device pass the | |
311 | * skb to its handler for processing | |
312 | */ | |
313 | skb = l3mdev_ip6_out((struct sock *)sk, skb); | |
314 | if (unlikely(!skb)) | |
315 | return 0; | |
316 | ||
1c1e9d2b ED |
317 | /* hooks should never assume socket lock is held. |
318 | * we promote our socket to non const | |
319 | */ | |
29a26a56 | 320 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
1c1e9d2b | 321 | net, (struct sock *)sk, skb, NULL, dst->dev, |
13206b6b | 322 | dst_output); |
1da177e4 LT |
323 | } |
324 | ||
1da177e4 | 325 | skb->dev = dst->dev; |
1c1e9d2b ED |
326 | /* ipv6_local_error() does not require socket lock, |
327 | * we promote our socket to non const | |
328 | */ | |
329 | ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu); | |
330 | ||
adf30907 | 331 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
332 | kfree_skb(skb); |
333 | return -EMSGSIZE; | |
334 | } | |
7159039a YH |
335 | EXPORT_SYMBOL(ip6_xmit); |
336 | ||
1da177e4 LT |
337 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
338 | { | |
339 | struct ip6_ra_chain *ra; | |
340 | struct sock *last = NULL; | |
341 | ||
342 | read_lock(&ip6_ra_lock); | |
343 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
344 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
345 | if (sk && ra->sel == sel && |
346 | (!sk->sk_bound_dev_if || | |
347 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
9036b2fe FR |
348 | struct ipv6_pinfo *np = inet6_sk(sk); |
349 | ||
350 | if (np && np->rtalert_isolate && | |
351 | !net_eq(sock_net(sk), dev_net(skb->dev))) { | |
352 | continue; | |
353 | } | |
1da177e4 LT |
354 | if (last) { |
355 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
356 | if (skb2) | |
357 | rawv6_rcv(last, skb2); | |
358 | } | |
359 | last = sk; | |
360 | } | |
361 | } | |
362 | ||
363 | if (last) { | |
364 | rawv6_rcv(last, skb); | |
365 | read_unlock(&ip6_ra_lock); | |
366 | return 1; | |
367 | } | |
368 | read_unlock(&ip6_ra_lock); | |
369 | return 0; | |
370 | } | |
371 | ||
e21e0b5f VN |
372 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
373 | { | |
0660e03f | 374 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f | 375 | u8 nexthdr = hdr->nexthdr; |
75f2811c | 376 | __be16 frag_off; |
e21e0b5f VN |
377 | int offset; |
378 | ||
379 | if (ipv6_ext_hdr(nexthdr)) { | |
75f2811c | 380 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); |
e21e0b5f VN |
381 | if (offset < 0) |
382 | return 0; | |
383 | } else | |
384 | offset = sizeof(struct ipv6hdr); | |
385 | ||
386 | if (nexthdr == IPPROTO_ICMPV6) { | |
387 | struct icmp6hdr *icmp6; | |
388 | ||
d56f90a7 ACM |
389 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
390 | offset + 1 - skb->data))) | |
e21e0b5f VN |
391 | return 0; |
392 | ||
d56f90a7 | 393 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
394 | |
395 | switch (icmp6->icmp6_type) { | |
396 | case NDISC_ROUTER_SOLICITATION: | |
397 | case NDISC_ROUTER_ADVERTISEMENT: | |
398 | case NDISC_NEIGHBOUR_SOLICITATION: | |
399 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
400 | case NDISC_REDIRECT: | |
401 | /* For reaction involving unicast neighbor discovery | |
402 | * message destined to the proxied address, pass it to | |
403 | * input function. | |
404 | */ | |
405 | return 1; | |
406 | default: | |
407 | break; | |
408 | } | |
409 | } | |
410 | ||
74553b09 VN |
411 | /* |
412 | * The proxying router can't forward traffic sent to a link-local | |
413 | * address, so signal the sender and discard the packet. This | |
414 | * behavior is clarified by the MIPv6 specification. | |
415 | */ | |
416 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
417 | dst_link_failure(skb); | |
418 | return -1; | |
419 | } | |
420 | ||
e21e0b5f VN |
421 | return 0; |
422 | } | |
423 | ||
0c4b51f0 EB |
424 | static inline int ip6_forward_finish(struct net *net, struct sock *sk, |
425 | struct sk_buff *skb) | |
1da177e4 | 426 | { |
71a1c915 JB |
427 | struct dst_entry *dst = skb_dst(skb); |
428 | ||
429 | __IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); | |
430 | __IP6_ADD_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len); | |
431 | ||
f839a6c9 IS |
432 | #ifdef CONFIG_NET_SWITCHDEV |
433 | if (skb->offload_l3_fwd_mark) { | |
434 | consume_skb(skb); | |
435 | return 0; | |
436 | } | |
437 | #endif | |
438 | ||
8203e2d8 | 439 | skb->tstamp = 0; |
13206b6b | 440 | return dst_output(net, sk, skb); |
1da177e4 LT |
441 | } |
442 | ||
fe6cc55f FW |
443 | static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
444 | { | |
418a3156 | 445 | if (skb->len <= mtu) |
fe6cc55f FW |
446 | return false; |
447 | ||
60ff7467 | 448 | /* ipv6 conntrack defrag sets max_frag_size + ignore_df */ |
fe6cc55f FW |
449 | if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu) |
450 | return true; | |
451 | ||
60ff7467 | 452 | if (skb->ignore_df) |
418a3156 FW |
453 | return false; |
454 | ||
779b7931 | 455 | if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) |
fe6cc55f FW |
456 | return false; |
457 | ||
458 | return true; | |
459 | } | |
460 | ||
1da177e4 LT |
461 | int ip6_forward(struct sk_buff *skb) |
462 | { | |
bdb7cc64 | 463 | struct inet6_dev *idev = __in6_dev_get_safely(skb->dev); |
adf30907 | 464 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 465 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 466 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 467 | struct net *net = dev_net(dst->dev); |
14f3ad6f | 468 | u32 mtu; |
1ab1457c | 469 | |
53b7997f | 470 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
471 | goto error; |
472 | ||
090f1166 LR |
473 | if (skb->pkt_type != PACKET_HOST) |
474 | goto drop; | |
475 | ||
9ef2e965 HFS |
476 | if (unlikely(skb->sk)) |
477 | goto drop; | |
478 | ||
4497b076 BH |
479 | if (skb_warn_if_lro(skb)) |
480 | goto drop; | |
481 | ||
1da177e4 | 482 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
bdb7cc64 | 483 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
484 | goto drop; |
485 | } | |
486 | ||
35fc92a9 | 487 | skb_forward_csum(skb); |
1da177e4 LT |
488 | |
489 | /* | |
490 | * We DO NOT make any processing on | |
491 | * RA packets, pushing them to user level AS IS | |
492 | * without ane WARRANTY that application will be able | |
493 | * to interpret them. The reason is that we | |
494 | * cannot make anything clever here. | |
495 | * | |
496 | * We are not end-node, so that if packet contains | |
497 | * AH/ESP, we cannot make anything. | |
498 | * Defragmentation also would be mistake, RA packets | |
499 | * cannot be fragmented, because there is no warranty | |
500 | * that different fragments will go along one path. --ANK | |
501 | */ | |
ab4eb353 YH |
502 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
503 | if (ip6_call_ra_chain(skb, ntohs(opt->ra))) | |
1da177e4 LT |
504 | return 0; |
505 | } | |
506 | ||
507 | /* | |
508 | * check and decrement ttl | |
509 | */ | |
510 | if (hdr->hop_limit <= 1) { | |
3ffe533c | 511 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
bdb7cc64 | 512 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
513 | |
514 | kfree_skb(skb); | |
515 | return -ETIMEDOUT; | |
516 | } | |
517 | ||
fbea49e1 | 518 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 519 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 520 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 VN |
521 | int proxied = ip6_forward_proxy_check(skb); |
522 | if (proxied > 0) | |
e21e0b5f | 523 | return ip6_input(skb); |
74553b09 | 524 | else if (proxied < 0) { |
bdb7cc64 | 525 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
74553b09 VN |
526 | goto drop; |
527 | } | |
e21e0b5f VN |
528 | } |
529 | ||
1da177e4 | 530 | if (!xfrm6_route_forward(skb)) { |
bdb7cc64 | 531 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
532 | goto drop; |
533 | } | |
adf30907 | 534 | dst = skb_dst(skb); |
1da177e4 LT |
535 | |
536 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
537 | send redirects to source routed frames. | |
1e5dc146 | 538 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 539 | */ |
2f17becf SS |
540 | if (IP6CB(skb)->iif == dst->dev->ifindex && |
541 | opt->srcrt == 0 && !skb_sec_path(skb)) { | |
1da177e4 | 542 | struct in6_addr *target = NULL; |
fbfe95a4 | 543 | struct inet_peer *peer; |
1da177e4 | 544 | struct rt6_info *rt; |
1da177e4 LT |
545 | |
546 | /* | |
547 | * incoming and outgoing devices are the same | |
548 | * send a redirect. | |
549 | */ | |
550 | ||
551 | rt = (struct rt6_info *) dst; | |
c45a3dfb DM |
552 | if (rt->rt6i_flags & RTF_GATEWAY) |
553 | target = &rt->rt6i_gateway; | |
1da177e4 LT |
554 | else |
555 | target = &hdr->daddr; | |
556 | ||
fd0273d7 | 557 | peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1); |
92d86829 | 558 | |
1da177e4 LT |
559 | /* Limit redirects both by destination (here) |
560 | and by source (inside ndisc_send_redirect) | |
561 | */ | |
fbfe95a4 | 562 | if (inet_peer_xrlim_allow(peer, 1*HZ)) |
4991969a | 563 | ndisc_send_redirect(skb, target); |
1d861aa4 DM |
564 | if (peer) |
565 | inet_putpeer(peer); | |
5bb1ab09 DS |
566 | } else { |
567 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
568 | ||
1da177e4 | 569 | /* This check is security critical. */ |
f81b2e7d YH |
570 | if (addrtype == IPV6_ADDR_ANY || |
571 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
572 | goto error; |
573 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
574 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3ffe533c | 575 | ICMPV6_NOT_NEIGHBOUR, 0); |
5bb1ab09 DS |
576 | goto error; |
577 | } | |
1da177e4 LT |
578 | } |
579 | ||
0954cf9c | 580 | mtu = ip6_dst_mtu_forward(dst); |
14f3ad6f UW |
581 | if (mtu < IPV6_MIN_MTU) |
582 | mtu = IPV6_MIN_MTU; | |
583 | ||
fe6cc55f | 584 | if (ip6_pkt_too_big(skb, mtu)) { |
1da177e4 LT |
585 | /* Again, force OUTPUT device used as source address */ |
586 | skb->dev = dst->dev; | |
14f3ad6f | 587 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
bdb7cc64 | 588 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INTOOBIGERRORS); |
1d015503 ED |
589 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
590 | IPSTATS_MIB_FRAGFAILS); | |
1da177e4 LT |
591 | kfree_skb(skb); |
592 | return -EMSGSIZE; | |
593 | } | |
594 | ||
595 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
1d015503 ED |
596 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
597 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
598 | goto drop; |
599 | } | |
600 | ||
0660e03f | 601 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
602 | |
603 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 604 | |
1da177e4 LT |
605 | hdr->hop_limit--; |
606 | ||
29a26a56 EB |
607 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, |
608 | net, NULL, skb, skb->dev, dst->dev, | |
6e23ae2a | 609 | ip6_forward_finish); |
1da177e4 LT |
610 | |
611 | error: | |
bdb7cc64 | 612 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
1da177e4 LT |
613 | drop: |
614 | kfree_skb(skb); | |
615 | return -EINVAL; | |
616 | } | |
617 | ||
618 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
619 | { | |
620 | to->pkt_type = from->pkt_type; | |
621 | to->priority = from->priority; | |
622 | to->protocol = from->protocol; | |
adf30907 ED |
623 | skb_dst_drop(to); |
624 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 625 | to->dev = from->dev; |
82e91ffe | 626 | to->mark = from->mark; |
1da177e4 | 627 | |
3dd1c9a1 PA |
628 | skb_copy_hash(to, from); |
629 | ||
1da177e4 LT |
630 | #ifdef CONFIG_NET_SCHED |
631 | to->tc_index = from->tc_index; | |
632 | #endif | |
e7ac05f3 | 633 | nf_copy(to, from); |
df5042f4 | 634 | skb_ext_copy(to, from); |
984bc16c | 635 | skb_copy_secmark(to, from); |
1da177e4 LT |
636 | } |
637 | ||
0feca619 PNA |
638 | int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, |
639 | u8 nexthdr, __be32 frag_id, | |
640 | struct ip6_fraglist_iter *iter) | |
641 | { | |
642 | unsigned int first_len; | |
643 | struct frag_hdr *fh; | |
644 | ||
645 | /* BUILD HEADER */ | |
646 | *prevhdr = NEXTHDR_FRAGMENT; | |
647 | iter->tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); | |
648 | if (!iter->tmp_hdr) | |
649 | return -ENOMEM; | |
650 | ||
b7034146 | 651 | iter->frag = skb_shinfo(skb)->frag_list; |
0feca619 PNA |
652 | skb_frag_list_init(skb); |
653 | ||
654 | iter->offset = 0; | |
655 | iter->hlen = hlen; | |
656 | iter->frag_id = frag_id; | |
657 | iter->nexthdr = nexthdr; | |
658 | ||
659 | __skb_pull(skb, hlen); | |
660 | fh = __skb_push(skb, sizeof(struct frag_hdr)); | |
661 | __skb_push(skb, hlen); | |
662 | skb_reset_network_header(skb); | |
663 | memcpy(skb_network_header(skb), iter->tmp_hdr, hlen); | |
664 | ||
665 | fh->nexthdr = nexthdr; | |
666 | fh->reserved = 0; | |
667 | fh->frag_off = htons(IP6_MF); | |
668 | fh->identification = frag_id; | |
669 | ||
670 | first_len = skb_pagelen(skb); | |
671 | skb->data_len = first_len - skb_headlen(skb); | |
672 | skb->len = first_len; | |
673 | ipv6_hdr(skb)->payload_len = htons(first_len - sizeof(struct ipv6hdr)); | |
674 | ||
675 | return 0; | |
676 | } | |
677 | EXPORT_SYMBOL(ip6_fraglist_init); | |
678 | ||
679 | void ip6_fraglist_prepare(struct sk_buff *skb, | |
680 | struct ip6_fraglist_iter *iter) | |
681 | { | |
682 | struct sk_buff *frag = iter->frag; | |
683 | unsigned int hlen = iter->hlen; | |
684 | struct frag_hdr *fh; | |
685 | ||
686 | frag->ip_summed = CHECKSUM_NONE; | |
687 | skb_reset_transport_header(frag); | |
688 | fh = __skb_push(frag, sizeof(struct frag_hdr)); | |
689 | __skb_push(frag, hlen); | |
690 | skb_reset_network_header(frag); | |
691 | memcpy(skb_network_header(frag), iter->tmp_hdr, hlen); | |
692 | iter->offset += skb->len - hlen - sizeof(struct frag_hdr); | |
693 | fh->nexthdr = iter->nexthdr; | |
694 | fh->reserved = 0; | |
695 | fh->frag_off = htons(iter->offset); | |
696 | if (frag->next) | |
697 | fh->frag_off |= htons(IP6_MF); | |
698 | fh->identification = iter->frag_id; | |
699 | ipv6_hdr(frag)->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | |
700 | ip6_copy_metadata(frag, skb); | |
701 | } | |
702 | EXPORT_SYMBOL(ip6_fraglist_prepare); | |
703 | ||
8a6a1f17 PNA |
704 | void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, |
705 | unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, | |
706 | u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state) | |
707 | { | |
708 | state->prevhdr = prevhdr; | |
709 | state->nexthdr = nexthdr; | |
710 | state->frag_id = frag_id; | |
711 | ||
712 | state->hlen = hlen; | |
713 | state->mtu = mtu; | |
714 | ||
715 | state->left = skb->len - hlen; /* Space per frame */ | |
716 | state->ptr = hlen; /* Where to start from */ | |
717 | ||
718 | state->hroom = hdr_room; | |
719 | state->troom = needed_tailroom; | |
720 | ||
721 | state->offset = 0; | |
722 | } | |
723 | EXPORT_SYMBOL(ip6_frag_init); | |
724 | ||
725 | struct sk_buff *ip6_frag_next(struct sk_buff *skb, struct ip6_frag_state *state) | |
726 | { | |
727 | u8 *prevhdr = state->prevhdr, *fragnexthdr_offset; | |
728 | struct sk_buff *frag; | |
729 | struct frag_hdr *fh; | |
730 | unsigned int len; | |
731 | ||
732 | len = state->left; | |
733 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
734 | if (len > state->mtu) | |
735 | len = state->mtu; | |
736 | /* IF: we are not sending up to and including the packet end | |
737 | then align the next start on an eight byte boundary */ | |
738 | if (len < state->left) | |
739 | len &= ~7; | |
740 | ||
741 | /* Allocate buffer */ | |
742 | frag = alloc_skb(len + state->hlen + sizeof(struct frag_hdr) + | |
743 | state->hroom + state->troom, GFP_ATOMIC); | |
744 | if (!frag) | |
745 | return ERR_PTR(-ENOMEM); | |
746 | ||
747 | /* | |
748 | * Set up data on packet | |
749 | */ | |
750 | ||
751 | ip6_copy_metadata(frag, skb); | |
752 | skb_reserve(frag, state->hroom); | |
753 | skb_put(frag, len + state->hlen + sizeof(struct frag_hdr)); | |
754 | skb_reset_network_header(frag); | |
755 | fh = (struct frag_hdr *)(skb_network_header(frag) + state->hlen); | |
756 | frag->transport_header = (frag->network_header + state->hlen + | |
757 | sizeof(struct frag_hdr)); | |
758 | ||
759 | /* | |
760 | * Charge the memory for the fragment to any owner | |
761 | * it might possess | |
762 | */ | |
763 | if (skb->sk) | |
764 | skb_set_owner_w(frag, skb->sk); | |
765 | ||
766 | /* | |
767 | * Copy the packet header into the new buffer. | |
768 | */ | |
769 | skb_copy_from_linear_data(skb, skb_network_header(frag), state->hlen); | |
770 | ||
771 | fragnexthdr_offset = skb_network_header(frag); | |
772 | fragnexthdr_offset += prevhdr - skb_network_header(skb); | |
773 | *fragnexthdr_offset = NEXTHDR_FRAGMENT; | |
774 | ||
775 | /* | |
776 | * Build fragment header. | |
777 | */ | |
778 | fh->nexthdr = state->nexthdr; | |
779 | fh->reserved = 0; | |
780 | fh->identification = state->frag_id; | |
781 | ||
782 | /* | |
783 | * Copy a block of the IP datagram. | |
784 | */ | |
785 | BUG_ON(skb_copy_bits(skb, state->ptr, skb_transport_header(frag), | |
786 | len)); | |
787 | state->left -= len; | |
788 | ||
789 | fh->frag_off = htons(state->offset); | |
790 | if (state->left > 0) | |
791 | fh->frag_off |= htons(IP6_MF); | |
792 | ipv6_hdr(frag)->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | |
793 | ||
794 | state->ptr += len; | |
795 | state->offset += len; | |
796 | ||
797 | return frag; | |
798 | } | |
799 | EXPORT_SYMBOL(ip6_frag_next); | |
800 | ||
7d8c6e39 EB |
801 | int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
802 | int (*output)(struct net *, struct sock *, struct sk_buff *)) | |
1da177e4 | 803 | { |
1da177e4 | 804 | struct sk_buff *frag; |
67ba4152 | 805 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
f60e5990 | 806 | struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
807 | inet6_sk(skb->sk) : NULL; | |
8a6a1f17 PNA |
808 | struct ip6_frag_state state; |
809 | unsigned int mtu, hlen, nexthdr_offset; | |
9669fffc | 810 | ktime_t tstamp = skb->tstamp; |
8a6a1f17 | 811 | int hroom, err = 0; |
286c2349 | 812 | __be32 frag_id; |
1da177e4 LT |
813 | u8 *prevhdr, nexthdr = 0; |
814 | ||
7dd7eb95 DM |
815 | err = ip6_find_1stfragopt(skb, &prevhdr); |
816 | if (err < 0) | |
2423496a | 817 | goto fail; |
7dd7eb95 | 818 | hlen = err; |
1da177e4 | 819 | nexthdr = *prevhdr; |
ef0efcd3 | 820 | nexthdr_offset = prevhdr - skb_network_header(skb); |
1da177e4 | 821 | |
628a5c56 | 822 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
823 | |
824 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 825 | * or if the skb it not generated by a local socket. |
b881ef76 | 826 | */ |
485fca66 FW |
827 | if (unlikely(!skb->ignore_df && skb->len > mtu)) |
828 | goto fail_toobig; | |
a34a101e | 829 | |
485fca66 FW |
830 | if (IP6CB(skb)->frag_max_size) { |
831 | if (IP6CB(skb)->frag_max_size > mtu) | |
832 | goto fail_toobig; | |
833 | ||
834 | /* don't send fragments larger than what we received */ | |
835 | mtu = IP6CB(skb)->frag_max_size; | |
836 | if (mtu < IPV6_MIN_MTU) | |
837 | mtu = IPV6_MIN_MTU; | |
b881ef76 JH |
838 | } |
839 | ||
d91675f9 YH |
840 | if (np && np->frag_size < mtu) { |
841 | if (np->frag_size) | |
842 | mtu = np->frag_size; | |
843 | } | |
89bc7848 | 844 | if (mtu < hlen + sizeof(struct frag_hdr) + 8) |
b72a2b01 | 845 | goto fail_toobig; |
1e0d69a9 | 846 | mtu -= hlen + sizeof(struct frag_hdr); |
1da177e4 | 847 | |
fd0273d7 MKL |
848 | frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr, |
849 | &ipv6_hdr(skb)->saddr); | |
286c2349 | 850 | |
405c92f7 HFS |
851 | if (skb->ip_summed == CHECKSUM_PARTIAL && |
852 | (err = skb_checksum_help(skb))) | |
853 | goto fail; | |
854 | ||
ef0efcd3 | 855 | prevhdr = skb_network_header(skb) + nexthdr_offset; |
1d325d21 | 856 | hroom = LL_RESERVED_SPACE(rt->dst.dev); |
21dc3301 | 857 | if (skb_has_frag_list(skb)) { |
c72d8cda | 858 | unsigned int first_len = skb_pagelen(skb); |
0feca619 | 859 | struct ip6_fraglist_iter iter; |
3d13008e | 860 | struct sk_buff *frag2; |
1da177e4 LT |
861 | |
862 | if (first_len - hlen > mtu || | |
863 | ((first_len - hlen) & 7) || | |
1d325d21 FW |
864 | skb_cloned(skb) || |
865 | skb_headroom(skb) < (hroom + sizeof(struct frag_hdr))) | |
1da177e4 LT |
866 | goto slow_path; |
867 | ||
4d9092bb | 868 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
869 | /* Correct geometry. */ |
870 | if (frag->len > mtu || | |
871 | ((frag->len & 7) && frag->next) || | |
1d325d21 | 872 | skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr))) |
3d13008e | 873 | goto slow_path_clean; |
1da177e4 | 874 | |
1da177e4 LT |
875 | /* Partially cloned skb? */ |
876 | if (skb_shared(frag)) | |
3d13008e | 877 | goto slow_path_clean; |
2fdba6b0 HX |
878 | |
879 | BUG_ON(frag->sk); | |
880 | if (skb->sk) { | |
2fdba6b0 HX |
881 | frag->sk = skb->sk; |
882 | frag->destructor = sock_wfree; | |
2fdba6b0 | 883 | } |
3d13008e | 884 | skb->truesize -= frag->truesize; |
1da177e4 LT |
885 | } |
886 | ||
0feca619 PNA |
887 | err = ip6_fraglist_init(skb, hlen, prevhdr, nexthdr, frag_id, |
888 | &iter); | |
889 | if (err < 0) | |
1d325d21 | 890 | goto fail; |
a11d206d | 891 | |
1da177e4 LT |
892 | for (;;) { |
893 | /* Prepare header of the next frame, | |
894 | * before previous one went down. */ | |
0feca619 PNA |
895 | if (iter.frag) |
896 | ip6_fraglist_prepare(skb, &iter); | |
1ab1457c | 897 | |
9669fffc | 898 | skb->tstamp = tstamp; |
7d8c6e39 | 899 | err = output(net, sk, skb); |
67ba4152 | 900 | if (!err) |
d8d1f30b | 901 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 902 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 903 | |
0feca619 | 904 | if (err || !iter.frag) |
1da177e4 LT |
905 | break; |
906 | ||
0feca619 | 907 | skb = ip6_fraglist_next(&iter); |
1da177e4 LT |
908 | } |
909 | ||
0feca619 | 910 | kfree(iter.tmp_hdr); |
1da177e4 LT |
911 | |
912 | if (err == 0) { | |
d8d1f30b | 913 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 914 | IPSTATS_MIB_FRAGOKS); |
1da177e4 LT |
915 | return 0; |
916 | } | |
917 | ||
b7034146 | 918 | kfree_skb_list(iter.frag); |
1da177e4 | 919 | |
d8d1f30b | 920 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 921 | IPSTATS_MIB_FRAGFAILS); |
1da177e4 | 922 | return err; |
3d13008e ED |
923 | |
924 | slow_path_clean: | |
925 | skb_walk_frags(skb, frag2) { | |
926 | if (frag2 == frag) | |
927 | break; | |
928 | frag2->sk = NULL; | |
929 | frag2->destructor = NULL; | |
930 | skb->truesize += frag2->truesize; | |
931 | } | |
1da177e4 LT |
932 | } |
933 | ||
934 | slow_path: | |
1da177e4 LT |
935 | /* |
936 | * Fragment the datagram. | |
937 | */ | |
938 | ||
8a6a1f17 PNA |
939 | ip6_frag_init(skb, hlen, mtu, rt->dst.dev->needed_tailroom, |
940 | LL_RESERVED_SPACE(rt->dst.dev), prevhdr, nexthdr, frag_id, | |
941 | &state); | |
1da177e4 LT |
942 | |
943 | /* | |
944 | * Keep copying data until we run out. | |
945 | */ | |
1da177e4 | 946 | |
8a6a1f17 PNA |
947 | while (state.left > 0) { |
948 | frag = ip6_frag_next(skb, &state); | |
949 | if (IS_ERR(frag)) { | |
950 | err = PTR_ERR(frag); | |
1da177e4 LT |
951 | goto fail; |
952 | } | |
953 | ||
1da177e4 LT |
954 | /* |
955 | * Put this fragment into the sending queue. | |
956 | */ | |
9669fffc | 957 | frag->tstamp = tstamp; |
7d8c6e39 | 958 | err = output(net, sk, frag); |
1da177e4 LT |
959 | if (err) |
960 | goto fail; | |
dafee490 | 961 | |
adf30907 | 962 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 963 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 964 | } |
adf30907 | 965 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 966 | IPSTATS_MIB_FRAGOKS); |
808db80a | 967 | consume_skb(skb); |
1da177e4 LT |
968 | return err; |
969 | ||
485fca66 FW |
970 | fail_toobig: |
971 | if (skb->sk && dst_allfrag(skb_dst(skb))) | |
972 | sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK); | |
973 | ||
485fca66 FW |
974 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
975 | err = -EMSGSIZE; | |
976 | ||
1da177e4 | 977 | fail: |
adf30907 | 978 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 979 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 980 | kfree_skb(skb); |
1da177e4 LT |
981 | return err; |
982 | } | |
983 | ||
b71d1d42 ED |
984 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
985 | const struct in6_addr *fl_addr, | |
986 | const struct in6_addr *addr_cache) | |
cf6b1982 | 987 | { |
a02cec21 | 988 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
63159f29 | 989 | (!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache)); |
cf6b1982 YH |
990 | } |
991 | ||
497c615a HX |
992 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
993 | struct dst_entry *dst, | |
b71d1d42 | 994 | const struct flowi6 *fl6) |
1da177e4 | 995 | { |
497c615a | 996 | struct ipv6_pinfo *np = inet6_sk(sk); |
a963a37d | 997 | struct rt6_info *rt; |
1da177e4 | 998 | |
497c615a HX |
999 | if (!dst) |
1000 | goto out; | |
1001 | ||
a963a37d ED |
1002 | if (dst->ops->family != AF_INET6) { |
1003 | dst_release(dst); | |
1004 | return NULL; | |
1005 | } | |
1006 | ||
1007 | rt = (struct rt6_info *)dst; | |
497c615a HX |
1008 | /* Yes, checking route validity in not connected |
1009 | * case is not very simple. Take into account, | |
1010 | * that we do not support routing by source, TOS, | |
67ba4152 | 1011 | * and MSG_DONTROUTE --ANK (980726) |
497c615a | 1012 | * |
cf6b1982 YH |
1013 | * 1. ip6_rt_check(): If route was host route, |
1014 | * check that cached destination is current. | |
497c615a HX |
1015 | * If it is network route, we still may |
1016 | * check its validity using saved pointer | |
1017 | * to the last used address: daddr_cache. | |
1018 | * We do not want to save whole address now, | |
1019 | * (because main consumer of this service | |
1020 | * is tcp, which has not this problem), | |
1021 | * so that the last trick works only on connected | |
1022 | * sockets. | |
1023 | * 2. oif also should be the same. | |
1024 | */ | |
4c9483b2 | 1025 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
8e1ef0a9 | 1026 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1027 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
8e1ef0a9 | 1028 | #endif |
ca254490 DA |
1029 | (!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) && |
1030 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) { | |
497c615a HX |
1031 | dst_release(dst); |
1032 | dst = NULL; | |
1da177e4 LT |
1033 | } |
1034 | ||
497c615a HX |
1035 | out: |
1036 | return dst; | |
1037 | } | |
1038 | ||
3aef934f | 1039 | static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk, |
4c9483b2 | 1040 | struct dst_entry **dst, struct flowi6 *fl6) |
497c615a | 1041 | { |
69cce1d1 DM |
1042 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
1043 | struct neighbour *n; | |
97cac082 | 1044 | struct rt6_info *rt; |
69cce1d1 DM |
1045 | #endif |
1046 | int err; | |
6f21c96a | 1047 | int flags = 0; |
497c615a | 1048 | |
e16e888b MS |
1049 | /* The correct way to handle this would be to do |
1050 | * ip6_route_get_saddr, and then ip6_route_output; however, | |
1051 | * the route-specific preferred source forces the | |
1052 | * ip6_route_output call _before_ ip6_route_get_saddr. | |
1053 | * | |
1054 | * In source specific routing (no src=any default route), | |
1055 | * ip6_route_output will fail given src=any saddr, though, so | |
1056 | * that's why we try it again later. | |
1057 | */ | |
1058 | if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) { | |
a68886a6 | 1059 | struct fib6_info *from; |
e16e888b MS |
1060 | struct rt6_info *rt; |
1061 | bool had_dst = *dst != NULL; | |
1da177e4 | 1062 | |
e16e888b MS |
1063 | if (!had_dst) |
1064 | *dst = ip6_route_output(net, sk, fl6); | |
1065 | rt = (*dst)->error ? NULL : (struct rt6_info *)*dst; | |
a68886a6 DA |
1066 | |
1067 | rcu_read_lock(); | |
1068 | from = rt ? rcu_dereference(rt->from) : NULL; | |
1069 | err = ip6_route_get_saddr(net, from, &fl6->daddr, | |
c3968a85 DW |
1070 | sk ? inet6_sk(sk)->srcprefs : 0, |
1071 | &fl6->saddr); | |
a68886a6 DA |
1072 | rcu_read_unlock(); |
1073 | ||
44456d37 | 1074 | if (err) |
1da177e4 | 1075 | goto out_err_release; |
e16e888b MS |
1076 | |
1077 | /* If we had an erroneous initial result, pretend it | |
1078 | * never existed and let the SA-enabled version take | |
1079 | * over. | |
1080 | */ | |
1081 | if (!had_dst && (*dst)->error) { | |
1082 | dst_release(*dst); | |
1083 | *dst = NULL; | |
1084 | } | |
6f21c96a PA |
1085 | |
1086 | if (fl6->flowi6_oif) | |
1087 | flags |= RT6_LOOKUP_F_IFACE; | |
1da177e4 LT |
1088 | } |
1089 | ||
e16e888b | 1090 | if (!*dst) |
6f21c96a | 1091 | *dst = ip6_route_output_flags(net, sk, fl6, flags); |
e16e888b MS |
1092 | |
1093 | err = (*dst)->error; | |
1094 | if (err) | |
1095 | goto out_err_release; | |
1096 | ||
95c385b4 | 1097 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
1098 | /* |
1099 | * Here if the dst entry we've looked up | |
1100 | * has a neighbour entry that is in the INCOMPLETE | |
1101 | * state and the src address from the flow is | |
1102 | * marked as OPTIMISTIC, we release the found | |
1103 | * dst entry and replace it instead with the | |
1104 | * dst entry of the nexthop router | |
1105 | */ | |
c56bf6fe | 1106 | rt = (struct rt6_info *) *dst; |
707be1ff | 1107 | rcu_read_lock_bh(); |
2647a9b0 MKL |
1108 | n = __ipv6_neigh_lookup_noref(rt->dst.dev, |
1109 | rt6_nexthop(rt, &fl6->daddr)); | |
707be1ff YH |
1110 | err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0; |
1111 | rcu_read_unlock_bh(); | |
1112 | ||
1113 | if (err) { | |
e550dfb0 | 1114 | struct inet6_ifaddr *ifp; |
4c9483b2 | 1115 | struct flowi6 fl_gw6; |
e550dfb0 NH |
1116 | int redirect; |
1117 | ||
4c9483b2 | 1118 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
e550dfb0 NH |
1119 | (*dst)->dev, 1); |
1120 | ||
1121 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
1122 | if (ifp) | |
1123 | in6_ifa_put(ifp); | |
1124 | ||
1125 | if (redirect) { | |
1126 | /* | |
1127 | * We need to get the dst entry for the | |
1128 | * default router instead | |
1129 | */ | |
1130 | dst_release(*dst); | |
4c9483b2 DM |
1131 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
1132 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
1133 | *dst = ip6_route_output(net, sk, &fl_gw6); | |
e5d08d71 IM |
1134 | err = (*dst)->error; |
1135 | if (err) | |
e550dfb0 | 1136 | goto out_err_release; |
95c385b4 | 1137 | } |
e550dfb0 | 1138 | } |
95c385b4 | 1139 | #endif |
ec5e3b0a | 1140 | if (ipv6_addr_v4mapped(&fl6->saddr) && |
00ea1cee WB |
1141 | !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr))) { |
1142 | err = -EAFNOSUPPORT; | |
1143 | goto out_err_release; | |
1144 | } | |
95c385b4 | 1145 | |
1da177e4 LT |
1146 | return 0; |
1147 | ||
1148 | out_err_release: | |
1149 | dst_release(*dst); | |
1150 | *dst = NULL; | |
8a966fc0 | 1151 | |
0d240e78 DA |
1152 | if (err == -ENETUNREACH) |
1153 | IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES); | |
1da177e4 LT |
1154 | return err; |
1155 | } | |
34a0b3cd | 1156 | |
497c615a HX |
1157 | /** |
1158 | * ip6_dst_lookup - perform route lookup on flow | |
b51cd7c8 | 1159 | * @net: Network namespace to perform lookup in |
497c615a HX |
1160 | * @sk: socket which provides route info |
1161 | * @dst: pointer to dst_entry * for result | |
4c9483b2 | 1162 | * @fl6: flow to lookup |
497c615a HX |
1163 | * |
1164 | * This function performs a route lookup on the given flow. | |
1165 | * | |
1166 | * It returns zero on success, or a standard errno code on error. | |
1167 | */ | |
343d60aa RP |
1168 | int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, |
1169 | struct flowi6 *fl6) | |
497c615a HX |
1170 | { |
1171 | *dst = NULL; | |
343d60aa | 1172 | return ip6_dst_lookup_tail(net, sk, dst, fl6); |
497c615a | 1173 | } |
3cf3dc6c ACM |
1174 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
1175 | ||
497c615a | 1176 | /** |
68d0c6d3 | 1177 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
b51cd7c8 | 1178 | * @net: Network namespace to perform lookup in |
68d0c6d3 | 1179 | * @sk: socket which provides route info |
4c9483b2 | 1180 | * @fl6: flow to lookup |
68d0c6d3 | 1181 | * @final_dst: final destination address for ipsec lookup |
68d0c6d3 DM |
1182 | * |
1183 | * This function performs a route lookup on the given flow. | |
1184 | * | |
1185 | * It returns a valid dst pointer on success, or a pointer encoded | |
1186 | * error code. | |
1187 | */ | |
c4e85f73 | 1188 | struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 1189 | const struct in6_addr *final_dst) |
68d0c6d3 DM |
1190 | { |
1191 | struct dst_entry *dst = NULL; | |
1192 | int err; | |
1193 | ||
c4e85f73 | 1194 | err = ip6_dst_lookup_tail(net, sk, &dst, fl6); |
68d0c6d3 DM |
1195 | if (err) |
1196 | return ERR_PTR(err); | |
1197 | if (final_dst) | |
4e3fd7a0 | 1198 | fl6->daddr = *final_dst; |
2774c131 | 1199 | |
c4e85f73 | 1200 | return xfrm_lookup_route(net, dst, flowi6_to_flowi(fl6), sk, 0); |
68d0c6d3 DM |
1201 | } |
1202 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
1203 | ||
1204 | /** | |
1205 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
497c615a | 1206 | * @sk: socket which provides the dst cache and route info |
4c9483b2 | 1207 | * @fl6: flow to lookup |
68d0c6d3 | 1208 | * @final_dst: final destination address for ipsec lookup |
96818159 | 1209 | * @connected: whether @sk is connected or not |
497c615a HX |
1210 | * |
1211 | * This function performs a route lookup on the given flow with the | |
1212 | * possibility of using the cached route in the socket if it is valid. | |
1213 | * It will take the socket dst lock when operating on the dst cache. | |
1214 | * As a result, this function can only be used in process context. | |
1215 | * | |
96818159 AK |
1216 | * In addition, for a connected socket, cache the dst in the socket |
1217 | * if the current cache is not valid. | |
1218 | * | |
68d0c6d3 DM |
1219 | * It returns a valid dst pointer on success, or a pointer encoded |
1220 | * error code. | |
497c615a | 1221 | */ |
4c9483b2 | 1222 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
96818159 AK |
1223 | const struct in6_addr *final_dst, |
1224 | bool connected) | |
497c615a | 1225 | { |
68d0c6d3 | 1226 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
497c615a | 1227 | |
4c9483b2 | 1228 | dst = ip6_sk_dst_check(sk, dst, fl6); |
96818159 AK |
1229 | if (dst) |
1230 | return dst; | |
1231 | ||
c4e85f73 | 1232 | dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_dst); |
96818159 AK |
1233 | if (connected && !IS_ERR(dst)) |
1234 | ip6_sk_dst_store_flow(sk, dst_clone(dst), fl6); | |
68d0c6d3 | 1235 | |
00bc0ef5 | 1236 | return dst; |
497c615a | 1237 | } |
68d0c6d3 | 1238 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
497c615a | 1239 | |
571912c6 MV |
1240 | /** |
1241 | * ip6_dst_lookup_tunnel - perform route lookup on tunnel | |
1242 | * @skb: Packet for which lookup is done | |
1243 | * @dev: Tunnel device | |
1244 | * @net: Network namespace of tunnel device | |
b51cd7c8 | 1245 | * @sock: Socket which provides route info |
571912c6 MV |
1246 | * @saddr: Memory to store the src ip address |
1247 | * @info: Tunnel information | |
1248 | * @protocol: IP protocol | |
b51cd7c8 | 1249 | * @use_cache: Flag to enable cache usage |
571912c6 MV |
1250 | * This function performs a route lookup on a tunnel |
1251 | * | |
1252 | * It returns a valid dst pointer and stores src address to be used in | |
1253 | * tunnel in param saddr on success, else a pointer encoded error code. | |
1254 | */ | |
1255 | ||
1256 | struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb, | |
1257 | struct net_device *dev, | |
1258 | struct net *net, | |
1259 | struct socket *sock, | |
1260 | struct in6_addr *saddr, | |
1261 | const struct ip_tunnel_info *info, | |
1262 | u8 protocol, | |
1263 | bool use_cache) | |
1264 | { | |
1265 | struct dst_entry *dst = NULL; | |
1266 | #ifdef CONFIG_DST_CACHE | |
1267 | struct dst_cache *dst_cache; | |
1268 | #endif | |
1269 | struct flowi6 fl6; | |
1270 | __u8 prio; | |
1271 | ||
1272 | #ifdef CONFIG_DST_CACHE | |
1273 | dst_cache = (struct dst_cache *)&info->dst_cache; | |
1274 | if (use_cache) { | |
1275 | dst = dst_cache_get_ip6(dst_cache, saddr); | |
1276 | if (dst) | |
1277 | return dst; | |
1278 | } | |
1279 | #endif | |
1280 | memset(&fl6, 0, sizeof(fl6)); | |
1281 | fl6.flowi6_mark = skb->mark; | |
1282 | fl6.flowi6_proto = protocol; | |
1283 | fl6.daddr = info->key.u.ipv6.dst; | |
1284 | fl6.saddr = info->key.u.ipv6.src; | |
1285 | prio = info->key.tos; | |
1286 | fl6.flowlabel = ip6_make_flowinfo(RT_TOS(prio), | |
1287 | info->key.label); | |
1288 | ||
1289 | dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6, | |
1290 | NULL); | |
1291 | if (IS_ERR(dst)) { | |
1292 | netdev_dbg(dev, "no route to %pI6\n", &fl6.daddr); | |
1293 | return ERR_PTR(-ENETUNREACH); | |
1294 | } | |
1295 | if (dst->dev == dev) { /* is this necessary? */ | |
1296 | netdev_dbg(dev, "circular route to %pI6\n", &fl6.daddr); | |
1297 | dst_release(dst); | |
1298 | return ERR_PTR(-ELOOP); | |
1299 | } | |
1300 | #ifdef CONFIG_DST_CACHE | |
1301 | if (use_cache) | |
1302 | dst_cache_set_ip6(dst_cache, dst, &fl6.saddr); | |
1303 | #endif | |
1304 | *saddr = fl6.saddr; | |
1305 | return dst; | |
1306 | } | |
1307 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_tunnel); | |
1308 | ||
0178b695 HX |
1309 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1310 | gfp_t gfp) | |
1311 | { | |
1312 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1313 | } | |
1314 | ||
1315 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1316 | gfp_t gfp) | |
1317 | { | |
1318 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1319 | } | |
1320 | ||
75a493e6 | 1321 | static void ip6_append_data_mtu(unsigned int *mtu, |
0c183379 G |
1322 | int *maxfraglen, |
1323 | unsigned int fragheaderlen, | |
1324 | struct sk_buff *skb, | |
75a493e6 | 1325 | struct rt6_info *rt, |
e367c2d0 | 1326 | unsigned int orig_mtu) |
0c183379 G |
1327 | { |
1328 | if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { | |
63159f29 | 1329 | if (!skb) { |
0c183379 | 1330 | /* first fragment, reserve header_len */ |
e367c2d0 | 1331 | *mtu = orig_mtu - rt->dst.header_len; |
0c183379 G |
1332 | |
1333 | } else { | |
1334 | /* | |
1335 | * this fragment is not first, the headers | |
1336 | * space is regarded as data space. | |
1337 | */ | |
e367c2d0 | 1338 | *mtu = orig_mtu; |
0c183379 G |
1339 | } |
1340 | *maxfraglen = ((*mtu - fragheaderlen) & ~7) | |
1341 | + fragheaderlen - sizeof(struct frag_hdr); | |
1342 | } | |
1343 | } | |
1344 | ||
366e41d9 | 1345 | static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork, |
26879da5 | 1346 | struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6, |
5fdaa88d | 1347 | struct rt6_info *rt, struct flowi6 *fl6) |
366e41d9 VY |
1348 | { |
1349 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1350 | unsigned int mtu; | |
26879da5 | 1351 | struct ipv6_txoptions *opt = ipc6->opt; |
366e41d9 VY |
1352 | |
1353 | /* | |
1354 | * setup for corking | |
1355 | */ | |
1356 | if (opt) { | |
1357 | if (WARN_ON(v6_cork->opt)) | |
1358 | return -EINVAL; | |
1359 | ||
864e2a1f | 1360 | v6_cork->opt = kzalloc(sizeof(*opt), sk->sk_allocation); |
63159f29 | 1361 | if (unlikely(!v6_cork->opt)) |
366e41d9 VY |
1362 | return -ENOBUFS; |
1363 | ||
864e2a1f | 1364 | v6_cork->opt->tot_len = sizeof(*opt); |
366e41d9 VY |
1365 | v6_cork->opt->opt_flen = opt->opt_flen; |
1366 | v6_cork->opt->opt_nflen = opt->opt_nflen; | |
1367 | ||
1368 | v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
1369 | sk->sk_allocation); | |
1370 | if (opt->dst0opt && !v6_cork->opt->dst0opt) | |
1371 | return -ENOBUFS; | |
1372 | ||
1373 | v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
1374 | sk->sk_allocation); | |
1375 | if (opt->dst1opt && !v6_cork->opt->dst1opt) | |
1376 | return -ENOBUFS; | |
1377 | ||
1378 | v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt, | |
1379 | sk->sk_allocation); | |
1380 | if (opt->hopopt && !v6_cork->opt->hopopt) | |
1381 | return -ENOBUFS; | |
1382 | ||
1383 | v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
1384 | sk->sk_allocation); | |
1385 | if (opt->srcrt && !v6_cork->opt->srcrt) | |
1386 | return -ENOBUFS; | |
1387 | ||
1388 | /* need source address above miyazawa*/ | |
1389 | } | |
1390 | dst_hold(&rt->dst); | |
1391 | cork->base.dst = &rt->dst; | |
1392 | cork->fl.u.ip6 = *fl6; | |
26879da5 WW |
1393 | v6_cork->hop_limit = ipc6->hlimit; |
1394 | v6_cork->tclass = ipc6->tclass; | |
366e41d9 VY |
1395 | if (rt->dst.flags & DST_XFRM_TUNNEL) |
1396 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? | |
749439bf | 1397 | READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst); |
366e41d9 VY |
1398 | else |
1399 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? | |
c02b3741 | 1400 | READ_ONCE(rt->dst.dev->mtu) : dst_mtu(xfrm_dst_path(&rt->dst)); |
366e41d9 VY |
1401 | if (np->frag_size < mtu) { |
1402 | if (np->frag_size) | |
1403 | mtu = np->frag_size; | |
1404 | } | |
749439bf MM |
1405 | if (mtu < IPV6_MIN_MTU) |
1406 | return -EINVAL; | |
366e41d9 | 1407 | cork->base.fragsize = mtu; |
fbf47813 | 1408 | cork->base.gso_size = ipc6->gso_size; |
678ca42d | 1409 | cork->base.tx_flags = 0; |
c6af0c22 | 1410 | cork->base.mark = ipc6->sockc.mark; |
678ca42d | 1411 | sock_tx_timestamp(sk, ipc6->sockc.tsflags, &cork->base.tx_flags); |
bec1f6f6 | 1412 | |
0f6c480f | 1413 | if (dst_allfrag(xfrm_dst_path(&rt->dst))) |
366e41d9 VY |
1414 | cork->base.flags |= IPCORK_ALLFRAG; |
1415 | cork->base.length = 0; | |
1416 | ||
5fdaa88d | 1417 | cork->base.transmit_time = ipc6->sockc.transmit_time; |
a818f75e | 1418 | |
366e41d9 VY |
1419 | return 0; |
1420 | } | |
1421 | ||
0bbe84a6 VY |
1422 | static int __ip6_append_data(struct sock *sk, |
1423 | struct flowi6 *fl6, | |
1424 | struct sk_buff_head *queue, | |
1425 | struct inet_cork *cork, | |
1426 | struct inet6_cork *v6_cork, | |
1427 | struct page_frag *pfrag, | |
1428 | int getfrag(void *from, char *to, int offset, | |
1429 | int len, int odd, struct sk_buff *skb), | |
1430 | void *from, int length, int transhdrlen, | |
5fdaa88d | 1431 | unsigned int flags, struct ipcm6_cookie *ipc6) |
1da177e4 | 1432 | { |
0c183379 | 1433 | struct sk_buff *skb, *skb_prev = NULL; |
10b8a3de | 1434 | unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu; |
b5947e5d | 1435 | struct ubuf_info *uarg = NULL; |
0bbe84a6 VY |
1436 | int exthdrlen = 0; |
1437 | int dst_exthdrlen = 0; | |
1da177e4 | 1438 | int hh_len; |
1da177e4 LT |
1439 | int copy; |
1440 | int err; | |
1441 | int offset = 0; | |
09c2d251 | 1442 | u32 tskey = 0; |
0bbe84a6 VY |
1443 | struct rt6_info *rt = (struct rt6_info *)cork->dst; |
1444 | struct ipv6_txoptions *opt = v6_cork->opt; | |
32dce968 | 1445 | int csummode = CHECKSUM_NONE; |
682b1a9d | 1446 | unsigned int maxnonfragsize, headersize; |
1f4c6eb2 | 1447 | unsigned int wmem_alloc_delta = 0; |
100f6d8e | 1448 | bool paged, extra_uref = false; |
1da177e4 | 1449 | |
0bbe84a6 VY |
1450 | skb = skb_peek_tail(queue); |
1451 | if (!skb) { | |
1452 | exthdrlen = opt ? opt->opt_flen : 0; | |
7efdba5b | 1453 | dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; |
1da177e4 | 1454 | } |
0bbe84a6 | 1455 | |
15e36f5b | 1456 | paged = !!cork->gso_size; |
bec1f6f6 | 1457 | mtu = cork->gso_size ? IP6_MAX_MTU : cork->fragsize; |
e367c2d0 | 1458 | orig_mtu = mtu; |
1da177e4 | 1459 | |
678ca42d WB |
1460 | if (cork->tx_flags & SKBTX_ANY_SW_TSTAMP && |
1461 | sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) | |
1462 | tskey = sk->sk_tskey++; | |
1463 | ||
d8d1f30b | 1464 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4 | 1465 | |
a1b05140 | 1466 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1467 | (opt ? opt->opt_nflen : 0); |
4df98e76 HFS |
1468 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - |
1469 | sizeof(struct frag_hdr); | |
1da177e4 | 1470 | |
682b1a9d HFS |
1471 | headersize = sizeof(struct ipv6hdr) + |
1472 | (opt ? opt->opt_flen + opt->opt_nflen : 0) + | |
1473 | (dst_allfrag(&rt->dst) ? | |
1474 | sizeof(struct frag_hdr) : 0) + | |
1475 | rt->rt6i_nfheader_len; | |
1476 | ||
10b8a3de PA |
1477 | /* as per RFC 7112 section 5, the entire IPv6 Header Chain must fit |
1478 | * the first fragment | |
1479 | */ | |
1480 | if (headersize + transhdrlen > mtu) | |
1481 | goto emsgsize; | |
1482 | ||
26879da5 | 1483 | if (cork->length + length > mtu - headersize && ipc6->dontfrag && |
682b1a9d HFS |
1484 | (sk->sk_protocol == IPPROTO_UDP || |
1485 | sk->sk_protocol == IPPROTO_RAW)) { | |
1486 | ipv6_local_rxpmtu(sk, fl6, mtu - headersize + | |
1487 | sizeof(struct ipv6hdr)); | |
1488 | goto emsgsize; | |
1489 | } | |
4df98e76 | 1490 | |
682b1a9d HFS |
1491 | if (ip6_sk_ignore_df(sk)) |
1492 | maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN; | |
1493 | else | |
1494 | maxnonfragsize = mtu; | |
4df98e76 | 1495 | |
682b1a9d | 1496 | if (cork->length + length > maxnonfragsize - headersize) { |
4df98e76 | 1497 | emsgsize: |
10b8a3de PA |
1498 | pmtu = max_t(int, mtu - headersize + sizeof(struct ipv6hdr), 0); |
1499 | ipv6_local_error(sk, EMSGSIZE, fl6, pmtu); | |
682b1a9d | 1500 | return -EMSGSIZE; |
1da177e4 LT |
1501 | } |
1502 | ||
682b1a9d HFS |
1503 | /* CHECKSUM_PARTIAL only with no extension headers and when |
1504 | * we are not going to fragment | |
1505 | */ | |
1506 | if (transhdrlen && sk->sk_protocol == IPPROTO_UDP && | |
1507 | headersize == sizeof(struct ipv6hdr) && | |
2b89ed65 | 1508 | length <= mtu - headersize && |
bec1f6f6 | 1509 | (!(flags & MSG_MORE) || cork->gso_size) && |
c8cd0989 | 1510 | rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM)) |
682b1a9d HFS |
1511 | csummode = CHECKSUM_PARTIAL; |
1512 | ||
b5947e5d | 1513 | if (flags & MSG_ZEROCOPY && length && sock_flag(sk, SOCK_ZEROCOPY)) { |
8c793822 | 1514 | uarg = msg_zerocopy_realloc(sk, length, skb_zcopy(skb)); |
b5947e5d WB |
1515 | if (!uarg) |
1516 | return -ENOBUFS; | |
522924b5 | 1517 | extra_uref = !skb_zcopy(skb); /* only ref on new uarg */ |
b5947e5d WB |
1518 | if (rt->dst.dev->features & NETIF_F_SG && |
1519 | csummode == CHECKSUM_PARTIAL) { | |
1520 | paged = true; | |
1521 | } else { | |
1522 | uarg->zerocopy = 0; | |
52900d22 | 1523 | skb_zcopy_set(skb, uarg, &extra_uref); |
b5947e5d WB |
1524 | } |
1525 | } | |
1526 | ||
1da177e4 LT |
1527 | /* |
1528 | * Let's try using as much space as possible. | |
1529 | * Use MTU if total length of the message fits into the MTU. | |
1530 | * Otherwise, we need to reserve fragment header and | |
1531 | * fragment alignment (= 8-15 octects, in total). | |
1532 | * | |
634a63e7 | 1533 | * Note that we may need to "move" the data from the tail |
1ab1457c | 1534 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1535 | * the message. |
1536 | * | |
1ab1457c | 1537 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1538 | * at once if non-fragmentable extension headers |
1539 | * are too large. | |
1ab1457c | 1540 | * --yoshfuji |
1da177e4 LT |
1541 | */ |
1542 | ||
2811ebac | 1543 | cork->length += length; |
2811ebac | 1544 | if (!skb) |
1da177e4 LT |
1545 | goto alloc_new_skb; |
1546 | ||
1547 | while (length > 0) { | |
1548 | /* Check if the remaining data fits into current packet. */ | |
bdc712b4 | 1549 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
1da177e4 LT |
1550 | if (copy < length) |
1551 | copy = maxfraglen - skb->len; | |
1552 | ||
1553 | if (copy <= 0) { | |
1554 | char *data; | |
1555 | unsigned int datalen; | |
1556 | unsigned int fraglen; | |
1557 | unsigned int fraggap; | |
1558 | unsigned int alloclen; | |
aba36930 | 1559 | unsigned int pagedlen; |
1da177e4 | 1560 | alloc_new_skb: |
1da177e4 | 1561 | /* There's no room in the current skb */ |
0c183379 G |
1562 | if (skb) |
1563 | fraggap = skb->len - maxfraglen; | |
1da177e4 LT |
1564 | else |
1565 | fraggap = 0; | |
0c183379 | 1566 | /* update mtu and maxfraglen if necessary */ |
63159f29 | 1567 | if (!skb || !skb_prev) |
0c183379 | 1568 | ip6_append_data_mtu(&mtu, &maxfraglen, |
75a493e6 | 1569 | fragheaderlen, skb, rt, |
e367c2d0 | 1570 | orig_mtu); |
0c183379 G |
1571 | |
1572 | skb_prev = skb; | |
1da177e4 LT |
1573 | |
1574 | /* | |
1575 | * If remaining data exceeds the mtu, | |
1576 | * we know we need more fragment(s). | |
1577 | */ | |
1578 | datalen = length + fraggap; | |
1da177e4 | 1579 | |
0c183379 G |
1580 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
1581 | datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; | |
15e36f5b | 1582 | fraglen = datalen + fragheaderlen; |
aba36930 | 1583 | pagedlen = 0; |
15e36f5b | 1584 | |
1da177e4 | 1585 | if ((flags & MSG_MORE) && |
d8d1f30b | 1586 | !(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4 | 1587 | alloclen = mtu; |
15e36f5b WB |
1588 | else if (!paged) |
1589 | alloclen = fraglen; | |
1590 | else { | |
1591 | alloclen = min_t(int, fraglen, MAX_HEADER); | |
1592 | pagedlen = fraglen - alloclen; | |
1593 | } | |
1da177e4 | 1594 | |
299b0767 SK |
1595 | alloclen += dst_exthdrlen; |
1596 | ||
0c183379 G |
1597 | if (datalen != length + fraggap) { |
1598 | /* | |
1599 | * this is not the last fragment, the trailer | |
1600 | * space is regarded as data space. | |
1601 | */ | |
1602 | datalen += rt->dst.trailer_len; | |
1603 | } | |
1604 | ||
1605 | alloclen += rt->dst.trailer_len; | |
1606 | fraglen = datalen + fragheaderlen; | |
1da177e4 LT |
1607 | |
1608 | /* | |
1609 | * We just reserve space for fragment header. | |
1ab1457c | 1610 | * Note: this may be overallocation if the message |
1da177e4 LT |
1611 | * (without MSG_MORE) fits into the MTU. |
1612 | */ | |
1613 | alloclen += sizeof(struct frag_hdr); | |
1614 | ||
15e36f5b | 1615 | copy = datalen - transhdrlen - fraggap - pagedlen; |
232cd35d ED |
1616 | if (copy < 0) { |
1617 | err = -EINVAL; | |
1618 | goto error; | |
1619 | } | |
1da177e4 LT |
1620 | if (transhdrlen) { |
1621 | skb = sock_alloc_send_skb(sk, | |
1622 | alloclen + hh_len, | |
1623 | (flags & MSG_DONTWAIT), &err); | |
1624 | } else { | |
1625 | skb = NULL; | |
1f4c6eb2 | 1626 | if (refcount_read(&sk->sk_wmem_alloc) + wmem_alloc_delta <= |
1da177e4 | 1627 | 2 * sk->sk_sndbuf) |
1f4c6eb2 ED |
1628 | skb = alloc_skb(alloclen + hh_len, |
1629 | sk->sk_allocation); | |
63159f29 | 1630 | if (unlikely(!skb)) |
1da177e4 LT |
1631 | err = -ENOBUFS; |
1632 | } | |
63159f29 | 1633 | if (!skb) |
1da177e4 LT |
1634 | goto error; |
1635 | /* | |
1636 | * Fill in the control structures | |
1637 | */ | |
9c9c9ad5 | 1638 | skb->protocol = htons(ETH_P_IPV6); |
32dce968 | 1639 | skb->ip_summed = csummode; |
1da177e4 | 1640 | skb->csum = 0; |
1f85851e G |
1641 | /* reserve for fragmentation and ipsec header */ |
1642 | skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + | |
1643 | dst_exthdrlen); | |
1da177e4 LT |
1644 | |
1645 | /* | |
1646 | * Find where to start putting bytes | |
1647 | */ | |
15e36f5b | 1648 | data = skb_put(skb, fraglen - pagedlen); |
1f85851e G |
1649 | skb_set_network_header(skb, exthdrlen); |
1650 | data += fragheaderlen; | |
b0e380b1 ACM |
1651 | skb->transport_header = (skb->network_header + |
1652 | fragheaderlen); | |
1da177e4 LT |
1653 | if (fraggap) { |
1654 | skb->csum = skb_copy_and_csum_bits( | |
1655 | skb_prev, maxfraglen, | |
8d5930df | 1656 | data + transhdrlen, fraggap); |
1da177e4 LT |
1657 | skb_prev->csum = csum_sub(skb_prev->csum, |
1658 | skb->csum); | |
1659 | data += fraggap; | |
e9fa4f7b | 1660 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 | 1661 | } |
232cd35d ED |
1662 | if (copy > 0 && |
1663 | getfrag(from, data + transhdrlen, offset, | |
1664 | copy, fraggap, skb) < 0) { | |
1da177e4 LT |
1665 | err = -EFAULT; |
1666 | kfree_skb(skb); | |
1667 | goto error; | |
1668 | } | |
1669 | ||
1670 | offset += copy; | |
15e36f5b | 1671 | length -= copy + transhdrlen; |
1da177e4 LT |
1672 | transhdrlen = 0; |
1673 | exthdrlen = 0; | |
299b0767 | 1674 | dst_exthdrlen = 0; |
1da177e4 | 1675 | |
52900d22 WB |
1676 | /* Only the initial fragment is time stamped */ |
1677 | skb_shinfo(skb)->tx_flags = cork->tx_flags; | |
1678 | cork->tx_flags = 0; | |
1679 | skb_shinfo(skb)->tskey = tskey; | |
1680 | tskey = 0; | |
1681 | skb_zcopy_set(skb, uarg, &extra_uref); | |
1682 | ||
0dec879f JA |
1683 | if ((flags & MSG_CONFIRM) && !skb_prev) |
1684 | skb_set_dst_pending_confirm(skb, 1); | |
1685 | ||
1da177e4 LT |
1686 | /* |
1687 | * Put the packet on the pending queue | |
1688 | */ | |
1f4c6eb2 ED |
1689 | if (!skb->destructor) { |
1690 | skb->destructor = sock_wfree; | |
1691 | skb->sk = sk; | |
1692 | wmem_alloc_delta += skb->truesize; | |
1693 | } | |
0bbe84a6 | 1694 | __skb_queue_tail(queue, skb); |
1da177e4 LT |
1695 | continue; |
1696 | } | |
1697 | ||
1698 | if (copy > length) | |
1699 | copy = length; | |
1700 | ||
113f99c3 WB |
1701 | if (!(rt->dst.dev->features&NETIF_F_SG) && |
1702 | skb_tailroom(skb) >= copy) { | |
1da177e4 LT |
1703 | unsigned int off; |
1704 | ||
1705 | off = skb->len; | |
1706 | if (getfrag(from, skb_put(skb, copy), | |
1707 | offset, copy, off, skb) < 0) { | |
1708 | __skb_trim(skb, off); | |
1709 | err = -EFAULT; | |
1710 | goto error; | |
1711 | } | |
b5947e5d | 1712 | } else if (!uarg || !uarg->zerocopy) { |
1da177e4 | 1713 | int i = skb_shinfo(skb)->nr_frags; |
1da177e4 | 1714 | |
5640f768 ED |
1715 | err = -ENOMEM; |
1716 | if (!sk_page_frag_refill(sk, pfrag)) | |
1da177e4 | 1717 | goto error; |
5640f768 ED |
1718 | |
1719 | if (!skb_can_coalesce(skb, i, pfrag->page, | |
1720 | pfrag->offset)) { | |
1721 | err = -EMSGSIZE; | |
1722 | if (i == MAX_SKB_FRAGS) | |
1723 | goto error; | |
1724 | ||
1725 | __skb_fill_page_desc(skb, i, pfrag->page, | |
1726 | pfrag->offset, 0); | |
1727 | skb_shinfo(skb)->nr_frags = ++i; | |
1728 | get_page(pfrag->page); | |
1da177e4 | 1729 | } |
5640f768 | 1730 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
9e903e08 | 1731 | if (getfrag(from, |
5640f768 ED |
1732 | page_address(pfrag->page) + pfrag->offset, |
1733 | offset, copy, skb->len, skb) < 0) | |
1734 | goto error_efault; | |
1735 | ||
1736 | pfrag->offset += copy; | |
1737 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1da177e4 LT |
1738 | skb->len += copy; |
1739 | skb->data_len += copy; | |
f945fa7a | 1740 | skb->truesize += copy; |
1f4c6eb2 | 1741 | wmem_alloc_delta += copy; |
b5947e5d WB |
1742 | } else { |
1743 | err = skb_zerocopy_iter_dgram(skb, from, copy); | |
1744 | if (err < 0) | |
1745 | goto error; | |
1da177e4 LT |
1746 | } |
1747 | offset += copy; | |
1748 | length -= copy; | |
1749 | } | |
5640f768 | 1750 | |
9e8445a5 PA |
1751 | if (wmem_alloc_delta) |
1752 | refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc); | |
1da177e4 | 1753 | return 0; |
5640f768 ED |
1754 | |
1755 | error_efault: | |
1756 | err = -EFAULT; | |
1da177e4 | 1757 | error: |
8e044917 | 1758 | net_zcopy_put_abort(uarg, extra_uref); |
bdc712b4 | 1759 | cork->length -= length; |
3bd653c8 | 1760 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1f4c6eb2 | 1761 | refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc); |
1da177e4 LT |
1762 | return err; |
1763 | } | |
0bbe84a6 VY |
1764 | |
1765 | int ip6_append_data(struct sock *sk, | |
1766 | int getfrag(void *from, char *to, int offset, int len, | |
1767 | int odd, struct sk_buff *skb), | |
26879da5 WW |
1768 | void *from, int length, int transhdrlen, |
1769 | struct ipcm6_cookie *ipc6, struct flowi6 *fl6, | |
5fdaa88d | 1770 | struct rt6_info *rt, unsigned int flags) |
0bbe84a6 VY |
1771 | { |
1772 | struct inet_sock *inet = inet_sk(sk); | |
1773 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1774 | int exthdrlen; | |
1775 | int err; | |
1776 | ||
1777 | if (flags&MSG_PROBE) | |
1778 | return 0; | |
1779 | if (skb_queue_empty(&sk->sk_write_queue)) { | |
1780 | /* | |
1781 | * setup for corking | |
1782 | */ | |
26879da5 | 1783 | err = ip6_setup_cork(sk, &inet->cork, &np->cork, |
5fdaa88d | 1784 | ipc6, rt, fl6); |
0bbe84a6 VY |
1785 | if (err) |
1786 | return err; | |
1787 | ||
26879da5 | 1788 | exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0); |
0bbe84a6 VY |
1789 | length += exthdrlen; |
1790 | transhdrlen += exthdrlen; | |
1791 | } else { | |
1792 | fl6 = &inet->cork.fl.u.ip6; | |
1793 | transhdrlen = 0; | |
1794 | } | |
1795 | ||
1796 | return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base, | |
1797 | &np->cork, sk_page_frag(sk), getfrag, | |
5fdaa88d | 1798 | from, length, transhdrlen, flags, ipc6); |
0bbe84a6 | 1799 | } |
a495f836 | 1800 | EXPORT_SYMBOL_GPL(ip6_append_data); |
1da177e4 | 1801 | |
366e41d9 VY |
1802 | static void ip6_cork_release(struct inet_cork_full *cork, |
1803 | struct inet6_cork *v6_cork) | |
bf138862 | 1804 | { |
366e41d9 VY |
1805 | if (v6_cork->opt) { |
1806 | kfree(v6_cork->opt->dst0opt); | |
1807 | kfree(v6_cork->opt->dst1opt); | |
1808 | kfree(v6_cork->opt->hopopt); | |
1809 | kfree(v6_cork->opt->srcrt); | |
1810 | kfree(v6_cork->opt); | |
1811 | v6_cork->opt = NULL; | |
0178b695 HX |
1812 | } |
1813 | ||
366e41d9 VY |
1814 | if (cork->base.dst) { |
1815 | dst_release(cork->base.dst); | |
1816 | cork->base.dst = NULL; | |
1817 | cork->base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 | 1818 | } |
366e41d9 | 1819 | memset(&cork->fl, 0, sizeof(cork->fl)); |
bf138862 PE |
1820 | } |
1821 | ||
6422398c VY |
1822 | struct sk_buff *__ip6_make_skb(struct sock *sk, |
1823 | struct sk_buff_head *queue, | |
1824 | struct inet_cork_full *cork, | |
1825 | struct inet6_cork *v6_cork) | |
1da177e4 LT |
1826 | { |
1827 | struct sk_buff *skb, *tmp_skb; | |
1828 | struct sk_buff **tail_skb; | |
1829 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1da177e4 | 1830 | struct ipv6_pinfo *np = inet6_sk(sk); |
3bd653c8 | 1831 | struct net *net = sock_net(sk); |
1da177e4 | 1832 | struct ipv6hdr *hdr; |
6422398c VY |
1833 | struct ipv6_txoptions *opt = v6_cork->opt; |
1834 | struct rt6_info *rt = (struct rt6_info *)cork->base.dst; | |
1835 | struct flowi6 *fl6 = &cork->fl.u.ip6; | |
4c9483b2 | 1836 | unsigned char proto = fl6->flowi6_proto; |
1da177e4 | 1837 | |
6422398c | 1838 | skb = __skb_dequeue(queue); |
63159f29 | 1839 | if (!skb) |
1da177e4 LT |
1840 | goto out; |
1841 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1842 | ||
1843 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1844 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1845 | __skb_pull(skb, skb_network_offset(skb)); |
6422398c | 1846 | while ((tmp_skb = __skb_dequeue(queue)) != NULL) { |
cfe1fc77 | 1847 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1848 | *tail_skb = tmp_skb; |
1849 | tail_skb = &(tmp_skb->next); | |
1850 | skb->len += tmp_skb->len; | |
1851 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1852 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1853 | tmp_skb->destructor = NULL; |
1854 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1855 | } |
1856 | ||
28a89453 | 1857 | /* Allow local fragmentation. */ |
60ff7467 | 1858 | skb->ignore_df = ip6_sk_ignore_df(sk); |
28a89453 | 1859 | |
4e3fd7a0 | 1860 | *final_dst = fl6->daddr; |
cfe1fc77 | 1861 | __skb_pull(skb, skb_network_header_len(skb)); |
1da177e4 LT |
1862 | if (opt && opt->opt_flen) |
1863 | ipv6_push_frag_opts(skb, opt, &proto); | |
1864 | if (opt && opt->opt_nflen) | |
613fa3ca | 1865 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst, &fl6->saddr); |
1da177e4 | 1866 | |
e2d1bca7 ACM |
1867 | skb_push(skb, sizeof(struct ipv6hdr)); |
1868 | skb_reset_network_header(skb); | |
0660e03f | 1869 | hdr = ipv6_hdr(skb); |
1ab1457c | 1870 | |
6422398c | 1871 | ip6_flow_hdr(hdr, v6_cork->tclass, |
cb1ce2ef | 1872 | ip6_make_flowlabel(net, skb, fl6->flowlabel, |
513674b5 | 1873 | ip6_autoflowlabel(net, np), fl6)); |
6422398c | 1874 | hdr->hop_limit = v6_cork->hop_limit; |
1da177e4 | 1875 | hdr->nexthdr = proto; |
4e3fd7a0 AD |
1876 | hdr->saddr = fl6->saddr; |
1877 | hdr->daddr = *final_dst; | |
1da177e4 | 1878 | |
a2c2064f | 1879 | skb->priority = sk->sk_priority; |
c6af0c22 | 1880 | skb->mark = cork->base.mark; |
a2c2064f | 1881 | |
a818f75e JSP |
1882 | skb->tstamp = cork->base.transmit_time; |
1883 | ||
d8d1f30b | 1884 | skb_dst_set(skb, dst_clone(&rt->dst)); |
edf391ff | 1885 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1886 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1887 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1888 | |
43a43b60 HFS |
1889 | ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type); |
1890 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); | |
14878f75 DS |
1891 | } |
1892 | ||
6422398c VY |
1893 | ip6_cork_release(cork, v6_cork); |
1894 | out: | |
1895 | return skb; | |
1896 | } | |
1897 | ||
1898 | int ip6_send_skb(struct sk_buff *skb) | |
1899 | { | |
1900 | struct net *net = sock_net(skb->sk); | |
1901 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); | |
1902 | int err; | |
1903 | ||
33224b16 | 1904 | err = ip6_local_out(net, skb->sk, skb); |
1da177e4 LT |
1905 | if (err) { |
1906 | if (err > 0) | |
6ce9e7b5 | 1907 | err = net_xmit_errno(err); |
1da177e4 | 1908 | if (err) |
6422398c VY |
1909 | IP6_INC_STATS(net, rt->rt6i_idev, |
1910 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
1911 | } |
1912 | ||
1da177e4 | 1913 | return err; |
6422398c VY |
1914 | } |
1915 | ||
1916 | int ip6_push_pending_frames(struct sock *sk) | |
1917 | { | |
1918 | struct sk_buff *skb; | |
1919 | ||
1920 | skb = ip6_finish_skb(sk); | |
1921 | if (!skb) | |
1922 | return 0; | |
1923 | ||
1924 | return ip6_send_skb(skb); | |
1da177e4 | 1925 | } |
a495f836 | 1926 | EXPORT_SYMBOL_GPL(ip6_push_pending_frames); |
1da177e4 | 1927 | |
0bbe84a6 | 1928 | static void __ip6_flush_pending_frames(struct sock *sk, |
6422398c VY |
1929 | struct sk_buff_head *queue, |
1930 | struct inet_cork_full *cork, | |
1931 | struct inet6_cork *v6_cork) | |
1da177e4 | 1932 | { |
1da177e4 LT |
1933 | struct sk_buff *skb; |
1934 | ||
0bbe84a6 | 1935 | while ((skb = __skb_dequeue_tail(queue)) != NULL) { |
adf30907 ED |
1936 | if (skb_dst(skb)) |
1937 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 1938 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
1939 | kfree_skb(skb); |
1940 | } | |
1941 | ||
6422398c | 1942 | ip6_cork_release(cork, v6_cork); |
1da177e4 | 1943 | } |
0bbe84a6 VY |
1944 | |
1945 | void ip6_flush_pending_frames(struct sock *sk) | |
1946 | { | |
6422398c VY |
1947 | __ip6_flush_pending_frames(sk, &sk->sk_write_queue, |
1948 | &inet_sk(sk)->cork, &inet6_sk(sk)->cork); | |
0bbe84a6 | 1949 | } |
a495f836 | 1950 | EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); |
6422398c VY |
1951 | |
1952 | struct sk_buff *ip6_make_skb(struct sock *sk, | |
1953 | int getfrag(void *from, char *to, int offset, | |
1954 | int len, int odd, struct sk_buff *skb), | |
1955 | void *from, int length, int transhdrlen, | |
26879da5 | 1956 | struct ipcm6_cookie *ipc6, struct flowi6 *fl6, |
6422398c | 1957 | struct rt6_info *rt, unsigned int flags, |
5fdaa88d | 1958 | struct inet_cork_full *cork) |
6422398c | 1959 | { |
6422398c VY |
1960 | struct inet6_cork v6_cork; |
1961 | struct sk_buff_head queue; | |
26879da5 | 1962 | int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0); |
6422398c VY |
1963 | int err; |
1964 | ||
1965 | if (flags & MSG_PROBE) | |
1966 | return NULL; | |
1967 | ||
1968 | __skb_queue_head_init(&queue); | |
1969 | ||
1cd7884d WB |
1970 | cork->base.flags = 0; |
1971 | cork->base.addr = 0; | |
1972 | cork->base.opt = NULL; | |
1973 | cork->base.dst = NULL; | |
6422398c | 1974 | v6_cork.opt = NULL; |
5fdaa88d | 1975 | err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt, fl6); |
862c03ee | 1976 | if (err) { |
1cd7884d | 1977 | ip6_cork_release(cork, &v6_cork); |
6422398c | 1978 | return ERR_PTR(err); |
862c03ee | 1979 | } |
26879da5 WW |
1980 | if (ipc6->dontfrag < 0) |
1981 | ipc6->dontfrag = inet6_sk(sk)->dontfrag; | |
6422398c | 1982 | |
1cd7884d | 1983 | err = __ip6_append_data(sk, fl6, &queue, &cork->base, &v6_cork, |
6422398c VY |
1984 | ¤t->task_frag, getfrag, from, |
1985 | length + exthdrlen, transhdrlen + exthdrlen, | |
5fdaa88d | 1986 | flags, ipc6); |
6422398c | 1987 | if (err) { |
1cd7884d | 1988 | __ip6_flush_pending_frames(sk, &queue, cork, &v6_cork); |
6422398c VY |
1989 | return ERR_PTR(err); |
1990 | } | |
1991 | ||
1cd7884d | 1992 | return __ip6_make_skb(sk, &queue, cork, &v6_cork); |
6422398c | 1993 | } |