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; |
e415ed3a | 63 | struct inet6_dev *idev = ip6_dst_idev(dst); |
5796015f | 64 | unsigned int hh_len = LL_RESERVED_SPACE(dev); |
e415ed3a VA |
65 | const struct in6_addr *daddr, *nexthop; |
66 | struct ipv6hdr *hdr; | |
f6b72b62 | 67 | struct neighbour *neigh; |
6fd6ce20 | 68 | int ret; |
1da177e4 | 69 | |
5796015f | 70 | /* Be paranoid, rather than too clever. */ |
e415ed3a VA |
71 | if (unlikely(hh_len > skb_headroom(skb)) && dev->header_ops) { |
72 | skb = skb_expand_head(skb, hh_len); | |
5796015f | 73 | if (!skb) { |
e415ed3a | 74 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
5796015f VA |
75 | return -ENOMEM; |
76 | } | |
77 | } | |
78 | ||
e415ed3a VA |
79 | hdr = ipv6_hdr(skb); |
80 | daddr = &hdr->daddr; | |
81 | if (ipv6_addr_is_multicast(daddr)) { | |
7026b1dd | 82 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) && |
8571ab47 | 83 | ((mroute6_is_socket(net, skb) && |
bd91b8bf | 84 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
e415ed3a | 85 | ipv6_chk_mcast_addr(dev, daddr, &hdr->saddr))) { |
1da177e4 LT |
86 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
87 | ||
88 | /* Do not check for IFF_ALLMULTI; multicast routing | |
89 | is not supported in any case. | |
90 | */ | |
91 | if (newskb) | |
b2e0b385 | 92 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
29a26a56 | 93 | net, sk, newskb, NULL, newskb->dev, |
95603e22 | 94 | dev_loopback_xmit); |
1da177e4 | 95 | |
e415ed3a | 96 | if (hdr->hop_limit == 0) { |
78126c41 | 97 | IP6_INC_STATS(net, idev, |
3bd653c8 | 98 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
99 | kfree_skb(skb); |
100 | return 0; | |
101 | } | |
102 | } | |
103 | ||
78126c41 | 104 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len); |
e415ed3a | 105 | if (IPV6_ADDR_MC_SCOPE(daddr) <= IPV6_ADDR_SCOPE_NODELOCAL && |
dd408515 HFS |
106 | !(dev->flags & IFF_LOOPBACK)) { |
107 | kfree_skb(skb); | |
108 | return 0; | |
109 | } | |
1da177e4 LT |
110 | } |
111 | ||
14972cbd RP |
112 | if (lwtunnel_xmit_redirect(dst->lwtstate)) { |
113 | int res = lwtunnel_xmit(skb); | |
114 | ||
115 | if (res < 0 || res == LWTUNNEL_XMIT_DONE) | |
116 | return res; | |
117 | } | |
118 | ||
6fd6ce20 | 119 | rcu_read_lock_bh(); |
e415ed3a VA |
120 | nexthop = rt6_nexthop((struct rt6_info *)dst, daddr); |
121 | neigh = __ipv6_neigh_lookup_noref(dev, nexthop); | |
58f71be5 PB |
122 | |
123 | if (unlikely(IS_ERR_OR_NULL(neigh))) { | |
124 | if (unlikely(!neigh)) | |
125 | neigh = __neigh_create(&nd_tbl, nexthop, dev, false); | |
126 | if (IS_ERR(neigh)) { | |
127 | rcu_read_unlock_bh(); | |
128 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTNOROUTES); | |
129 | kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_CREATEFAIL); | |
130 | return -EINVAL; | |
131 | } | |
6fd6ce20 | 132 | } |
58f71be5 PB |
133 | sock_confirm_neigh(skb, neigh); |
134 | ret = neigh_output(neigh, skb, false); | |
6fd6ce20 | 135 | rcu_read_unlock_bh(); |
58f71be5 | 136 | return ret; |
1da177e4 LT |
137 | } |
138 | ||
b210de4f AL |
139 | static int |
140 | ip6_finish_output_gso_slowpath_drop(struct net *net, struct sock *sk, | |
141 | struct sk_buff *skb, unsigned int mtu) | |
142 | { | |
143 | struct sk_buff *segs, *nskb; | |
144 | netdev_features_t features; | |
145 | int ret = 0; | |
146 | ||
147 | /* Please see corresponding comment in ip_finish_output_gso | |
148 | * describing the cases where GSO segment length exceeds the | |
149 | * egress MTU. | |
150 | */ | |
151 | features = netif_skb_features(skb); | |
152 | segs = skb_gso_segment(skb, features & ~NETIF_F_GSO_MASK); | |
153 | if (IS_ERR_OR_NULL(segs)) { | |
154 | kfree_skb(skb); | |
155 | return -ENOMEM; | |
156 | } | |
157 | ||
158 | consume_skb(skb); | |
159 | ||
160 | skb_list_walk_safe(segs, segs, nskb) { | |
161 | int err; | |
162 | ||
163 | skb_mark_not_on_list(segs); | |
164 | err = ip6_fragment(net, sk, segs, ip6_finish_output2); | |
165 | if (err && ret == 0) | |
166 | ret = err; | |
167 | } | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
956fe219 | 172 | static int __ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
9e508490 | 173 | { |
b210de4f AL |
174 | unsigned int mtu; |
175 | ||
09ee9dba TB |
176 | #if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM) |
177 | /* Policy lookup after SNAT yielded a new policy */ | |
178 | if (skb_dst(skb)->xfrm) { | |
19d36c5f | 179 | IP6CB(skb)->flags |= IP6SKB_REROUTED; |
09ee9dba TB |
180 | return dst_output(net, sk, skb); |
181 | } | |
182 | #endif | |
183 | ||
b210de4f | 184 | mtu = ip6_skb_dst_mtu(skb); |
80e425b6 CL |
185 | if (skb_is_gso(skb) && |
186 | !(IP6CB(skb)->flags & IP6SKB_FAKEJUMBO) && | |
187 | !skb_gso_validate_network_len(skb, mtu)) | |
b210de4f AL |
188 | return ip6_finish_output_gso_slowpath_drop(net, sk, skb, mtu); |
189 | ||
190 | if ((skb->len > mtu && !skb_is_gso(skb)) || | |
9037c357 JP |
191 | dst_allfrag(skb_dst(skb)) || |
192 | (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size)) | |
7d8c6e39 | 193 | return ip6_fragment(net, sk, skb, ip6_finish_output2); |
9e508490 | 194 | else |
7d8c6e39 | 195 | return ip6_finish_output2(net, sk, skb); |
9e508490 JE |
196 | } |
197 | ||
956fe219 | 198 | static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
199 | { | |
200 | int ret; | |
201 | ||
202 | ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb); | |
203 | switch (ret) { | |
204 | case NET_XMIT_SUCCESS: | |
956fe219 | 205 | case NET_XMIT_CN: |
206 | return __ip6_finish_output(net, sk, skb) ? : ret; | |
207 | default: | |
5e187189 | 208 | kfree_skb_reason(skb, SKB_DROP_REASON_BPF_CGROUP_EGRESS); |
956fe219 | 209 | return ret; |
210 | } | |
211 | } | |
212 | ||
ede2059d | 213 | int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 214 | { |
28f8bfd1 | 215 | struct net_device *dev = skb_dst(skb)->dev, *indev = skb->dev; |
adf30907 | 216 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
be10de0a | 217 | |
97a7a37a CF |
218 | skb->protocol = htons(ETH_P_IPV6); |
219 | skb->dev = dev; | |
220 | ||
778d80be | 221 | if (unlikely(idev->cnf.disable_ipv6)) { |
19a0644c | 222 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
5e187189 | 223 | kfree_skb_reason(skb, SKB_DROP_REASON_IPV6DISABLED); |
778d80be YH |
224 | return 0; |
225 | } | |
226 | ||
29a26a56 | 227 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
28f8bfd1 | 228 | net, sk, skb, indev, dev, |
9c6eb28a JE |
229 | ip6_finish_output, |
230 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1da177e4 | 231 | } |
6585d7dc | 232 | EXPORT_SYMBOL(ip6_output); |
1da177e4 | 233 | |
e9191ffb | 234 | bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np) |
513674b5 SL |
235 | { |
236 | if (!np->autoflowlabel_set) | |
237 | return ip6_default_np_autolabel(net); | |
238 | else | |
239 | return np->autoflowlabel; | |
240 | } | |
241 | ||
1da177e4 | 242 | /* |
1c1e9d2b ED |
243 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
244 | * Note : socket lock is not held for SYNACK packets, but might be modified | |
245 | * by calls to skb_set_owner_w() and ipv6_local_error(), | |
246 | * which are using proper atomic operations or spinlocks. | |
1da177e4 | 247 | */ |
1c1e9d2b | 248 | int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
4f6570d7 | 249 | __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority) |
1da177e4 | 250 | { |
3bd653c8 | 251 | struct net *net = sock_net(sk); |
1c1e9d2b | 252 | const struct ipv6_pinfo *np = inet6_sk(sk); |
4c9483b2 | 253 | struct in6_addr *first_hop = &fl6->daddr; |
adf30907 | 254 | struct dst_entry *dst = skb_dst(skb); |
0c9f227b VA |
255 | struct net_device *dev = dst->dev; |
256 | struct inet6_dev *idev = ip6_dst_idev(dst); | |
80e425b6 CL |
257 | struct hop_jumbo_hdr *hop_jumbo; |
258 | int hoplen = sizeof(*hop_jumbo); | |
66033f47 | 259 | unsigned int head_room; |
1da177e4 | 260 | struct ipv6hdr *hdr; |
4c9483b2 | 261 | u8 proto = fl6->flowi6_proto; |
1da177e4 | 262 | int seg_len = skb->len; |
e651f03a | 263 | int hlimit = -1; |
1da177e4 LT |
264 | u32 mtu; |
265 | ||
80e425b6 | 266 | head_room = sizeof(struct ipv6hdr) + hoplen + LL_RESERVED_SPACE(dev); |
66033f47 SB |
267 | if (opt) |
268 | head_room += opt->opt_nflen + opt->opt_flen; | |
269 | ||
0c9f227b VA |
270 | if (unlikely(head_room > skb_headroom(skb))) { |
271 | skb = skb_expand_head(skb, head_room); | |
272 | if (!skb) { | |
273 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); | |
66033f47 | 274 | return -ENOBUFS; |
1da177e4 | 275 | } |
66033f47 SB |
276 | } |
277 | ||
278 | if (opt) { | |
279 | seg_len += opt->opt_nflen + opt->opt_flen; | |
280 | ||
1da177e4 LT |
281 | if (opt->opt_flen) |
282 | ipv6_push_frag_opts(skb, opt, &proto); | |
66033f47 | 283 | |
1da177e4 | 284 | if (opt->opt_nflen) |
613fa3ca DL |
285 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop, |
286 | &fl6->saddr); | |
1da177e4 LT |
287 | } |
288 | ||
80e425b6 CL |
289 | if (unlikely(seg_len > IPV6_MAXPLEN)) { |
290 | hop_jumbo = skb_push(skb, hoplen); | |
291 | ||
292 | hop_jumbo->nexthdr = proto; | |
293 | hop_jumbo->hdrlen = 0; | |
294 | hop_jumbo->tlv_type = IPV6_TLV_JUMBO; | |
295 | hop_jumbo->tlv_len = 4; | |
296 | hop_jumbo->jumbo_payload_len = htonl(seg_len + hoplen); | |
297 | ||
298 | proto = IPPROTO_HOPOPTS; | |
299 | seg_len = 0; | |
300 | IP6CB(skb)->flags |= IP6SKB_FAKEJUMBO; | |
301 | } | |
302 | ||
e2d1bca7 ACM |
303 | skb_push(skb, sizeof(struct ipv6hdr)); |
304 | skb_reset_network_header(skb); | |
0660e03f | 305 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
306 | |
307 | /* | |
308 | * Fill in the IPv6 header | |
309 | */ | |
b903d324 | 310 | if (np) |
1da177e4 LT |
311 | hlimit = np->hop_limit; |
312 | if (hlimit < 0) | |
6b75d090 | 313 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 | 314 | |
cb1ce2ef | 315 | ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel, |
513674b5 | 316 | ip6_autoflowlabel(net, np), fl6)); |
41a1f8ea | 317 | |
1da177e4 LT |
318 | hdr->payload_len = htons(seg_len); |
319 | hdr->nexthdr = proto; | |
320 | hdr->hop_limit = hlimit; | |
321 | ||
4e3fd7a0 AD |
322 | hdr->saddr = fl6->saddr; |
323 | hdr->daddr = *first_hop; | |
1da177e4 | 324 | |
9c9c9ad5 | 325 | skb->protocol = htons(ETH_P_IPV6); |
4f6570d7 | 326 | skb->priority = priority; |
92e55f41 | 327 | skb->mark = mark; |
a2c2064f | 328 | |
1da177e4 | 329 | mtu = dst_mtu(dst); |
60ff7467 | 330 | if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) { |
0c9f227b | 331 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
a8e3e1a9 DA |
332 | |
333 | /* if egress device is enslaved to an L3 master device pass the | |
334 | * skb to its handler for processing | |
335 | */ | |
336 | skb = l3mdev_ip6_out((struct sock *)sk, skb); | |
337 | if (unlikely(!skb)) | |
338 | return 0; | |
339 | ||
1c1e9d2b ED |
340 | /* hooks should never assume socket lock is held. |
341 | * we promote our socket to non const | |
342 | */ | |
29a26a56 | 343 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
0c9f227b | 344 | net, (struct sock *)sk, skb, NULL, dev, |
13206b6b | 345 | dst_output); |
1da177e4 LT |
346 | } |
347 | ||
0c9f227b | 348 | skb->dev = dev; |
1c1e9d2b ED |
349 | /* ipv6_local_error() does not require socket lock, |
350 | * we promote our socket to non const | |
351 | */ | |
352 | ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu); | |
353 | ||
0c9f227b | 354 | IP6_INC_STATS(net, idev, IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
355 | kfree_skb(skb); |
356 | return -EMSGSIZE; | |
357 | } | |
7159039a YH |
358 | EXPORT_SYMBOL(ip6_xmit); |
359 | ||
1da177e4 LT |
360 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
361 | { | |
362 | struct ip6_ra_chain *ra; | |
363 | struct sock *last = NULL; | |
364 | ||
365 | read_lock(&ip6_ra_lock); | |
366 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
367 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
368 | if (sk && ra->sel == sel && |
369 | (!sk->sk_bound_dev_if || | |
370 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
9036b2fe FR |
371 | struct ipv6_pinfo *np = inet6_sk(sk); |
372 | ||
373 | if (np && np->rtalert_isolate && | |
374 | !net_eq(sock_net(sk), dev_net(skb->dev))) { | |
375 | continue; | |
376 | } | |
1da177e4 LT |
377 | if (last) { |
378 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
379 | if (skb2) | |
380 | rawv6_rcv(last, skb2); | |
381 | } | |
382 | last = sk; | |
383 | } | |
384 | } | |
385 | ||
386 | if (last) { | |
387 | rawv6_rcv(last, skb); | |
388 | read_unlock(&ip6_ra_lock); | |
389 | return 1; | |
390 | } | |
391 | read_unlock(&ip6_ra_lock); | |
392 | return 0; | |
393 | } | |
394 | ||
e21e0b5f VN |
395 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
396 | { | |
0660e03f | 397 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e21e0b5f | 398 | u8 nexthdr = hdr->nexthdr; |
75f2811c | 399 | __be16 frag_off; |
e21e0b5f VN |
400 | int offset; |
401 | ||
402 | if (ipv6_ext_hdr(nexthdr)) { | |
75f2811c | 403 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); |
e21e0b5f VN |
404 | if (offset < 0) |
405 | return 0; | |
406 | } else | |
407 | offset = sizeof(struct ipv6hdr); | |
408 | ||
409 | if (nexthdr == IPPROTO_ICMPV6) { | |
410 | struct icmp6hdr *icmp6; | |
411 | ||
d56f90a7 ACM |
412 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
413 | offset + 1 - skb->data))) | |
e21e0b5f VN |
414 | return 0; |
415 | ||
d56f90a7 | 416 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
e21e0b5f VN |
417 | |
418 | switch (icmp6->icmp6_type) { | |
419 | case NDISC_ROUTER_SOLICITATION: | |
420 | case NDISC_ROUTER_ADVERTISEMENT: | |
421 | case NDISC_NEIGHBOUR_SOLICITATION: | |
422 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
423 | case NDISC_REDIRECT: | |
424 | /* For reaction involving unicast neighbor discovery | |
425 | * message destined to the proxied address, pass it to | |
426 | * input function. | |
427 | */ | |
428 | return 1; | |
429 | default: | |
430 | break; | |
431 | } | |
432 | } | |
433 | ||
74553b09 VN |
434 | /* |
435 | * The proxying router can't forward traffic sent to a link-local | |
436 | * address, so signal the sender and discard the packet. This | |
437 | * behavior is clarified by the MIPv6 specification. | |
438 | */ | |
439 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
440 | dst_link_failure(skb); | |
441 | return -1; | |
442 | } | |
443 | ||
e21e0b5f VN |
444 | return 0; |
445 | } | |
446 | ||
0c4b51f0 EB |
447 | static inline int ip6_forward_finish(struct net *net, struct sock *sk, |
448 | struct sk_buff *skb) | |
1da177e4 | 449 | { |
71a1c915 JB |
450 | struct dst_entry *dst = skb_dst(skb); |
451 | ||
452 | __IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); | |
453 | __IP6_ADD_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len); | |
454 | ||
f839a6c9 IS |
455 | #ifdef CONFIG_NET_SWITCHDEV |
456 | if (skb->offload_l3_fwd_mark) { | |
457 | consume_skb(skb); | |
458 | return 0; | |
459 | } | |
460 | #endif | |
461 | ||
de799101 | 462 | skb_clear_tstamp(skb); |
13206b6b | 463 | return dst_output(net, sk, skb); |
1da177e4 LT |
464 | } |
465 | ||
fe6cc55f FW |
466 | static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
467 | { | |
418a3156 | 468 | if (skb->len <= mtu) |
fe6cc55f FW |
469 | return false; |
470 | ||
60ff7467 | 471 | /* ipv6 conntrack defrag sets max_frag_size + ignore_df */ |
fe6cc55f FW |
472 | if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu) |
473 | return true; | |
474 | ||
60ff7467 | 475 | if (skb->ignore_df) |
418a3156 FW |
476 | return false; |
477 | ||
779b7931 | 478 | if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) |
fe6cc55f FW |
479 | return false; |
480 | ||
481 | return true; | |
482 | } | |
483 | ||
1da177e4 LT |
484 | int ip6_forward(struct sk_buff *skb) |
485 | { | |
adf30907 | 486 | struct dst_entry *dst = skb_dst(skb); |
0660e03f | 487 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
1da177e4 | 488 | struct inet6_skb_parm *opt = IP6CB(skb); |
c346dca1 | 489 | struct net *net = dev_net(dst->dev); |
0857d6f8 | 490 | struct inet6_dev *idev; |
2edc1a38 | 491 | SKB_DR(reason); |
14f3ad6f | 492 | u32 mtu; |
1ab1457c | 493 | |
0857d6f8 | 494 | idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); |
53b7997f | 495 | if (net->ipv6.devconf_all->forwarding == 0) |
1da177e4 LT |
496 | goto error; |
497 | ||
090f1166 LR |
498 | if (skb->pkt_type != PACKET_HOST) |
499 | goto drop; | |
500 | ||
9ef2e965 HFS |
501 | if (unlikely(skb->sk)) |
502 | goto drop; | |
503 | ||
4497b076 BH |
504 | if (skb_warn_if_lro(skb)) |
505 | goto drop; | |
506 | ||
ccd27f05 | 507 | if (!net->ipv6.devconf_all->disable_policy && |
e3fa461d | 508 | (!idev || !idev->cnf.disable_policy) && |
ccd27f05 | 509 | !xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
bdb7cc64 | 510 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
511 | goto drop; |
512 | } | |
513 | ||
35fc92a9 | 514 | skb_forward_csum(skb); |
1da177e4 LT |
515 | |
516 | /* | |
517 | * We DO NOT make any processing on | |
518 | * RA packets, pushing them to user level AS IS | |
519 | * without ane WARRANTY that application will be able | |
520 | * to interpret them. The reason is that we | |
521 | * cannot make anything clever here. | |
522 | * | |
523 | * We are not end-node, so that if packet contains | |
524 | * AH/ESP, we cannot make anything. | |
525 | * Defragmentation also would be mistake, RA packets | |
526 | * cannot be fragmented, because there is no warranty | |
527 | * that different fragments will go along one path. --ANK | |
528 | */ | |
ab4eb353 YH |
529 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
530 | if (ip6_call_ra_chain(skb, ntohs(opt->ra))) | |
1da177e4 LT |
531 | return 0; |
532 | } | |
533 | ||
534 | /* | |
535 | * check and decrement ttl | |
536 | */ | |
537 | if (hdr->hop_limit <= 1) { | |
3ffe533c | 538 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
bdb7cc64 | 539 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 540 | |
2edc1a38 | 541 | kfree_skb_reason(skb, SKB_DROP_REASON_IP_INHDR); |
1da177e4 LT |
542 | return -ETIMEDOUT; |
543 | } | |
544 | ||
fbea49e1 | 545 | /* XXX: idev->cnf.proxy_ndp? */ |
53b7997f | 546 | if (net->ipv6.devconf_all->proxy_ndp && |
8a3edd80 | 547 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
74553b09 | 548 | int proxied = ip6_forward_proxy_check(skb); |
46c7655f | 549 | if (proxied > 0) { |
9f535c87 GR |
550 | /* It's tempting to decrease the hop limit |
551 | * here by 1, as we do at the end of the | |
552 | * function too. | |
553 | * | |
554 | * But that would be incorrect, as proxying is | |
555 | * not forwarding. The ip6_input function | |
556 | * will handle this packet locally, and it | |
557 | * depends on the hop limit being unchanged. | |
558 | * | |
559 | * One example is the NDP hop limit, that | |
560 | * always has to stay 255, but other would be | |
561 | * similar checks around RA packets, where the | |
562 | * user can even change the desired limit. | |
563 | */ | |
e21e0b5f | 564 | return ip6_input(skb); |
46c7655f | 565 | } else if (proxied < 0) { |
bdb7cc64 | 566 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
74553b09 VN |
567 | goto drop; |
568 | } | |
e21e0b5f VN |
569 | } |
570 | ||
1da177e4 | 571 | if (!xfrm6_route_forward(skb)) { |
bdb7cc64 | 572 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
2edc1a38 | 573 | SKB_DR_SET(reason, XFRM_POLICY); |
1da177e4 LT |
574 | goto drop; |
575 | } | |
adf30907 | 576 | dst = skb_dst(skb); |
1da177e4 LT |
577 | |
578 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
579 | send redirects to source routed frames. | |
1e5dc146 | 580 | We don't send redirects to frames decapsulated from IPsec. |
1da177e4 | 581 | */ |
2f17becf SS |
582 | if (IP6CB(skb)->iif == dst->dev->ifindex && |
583 | opt->srcrt == 0 && !skb_sec_path(skb)) { | |
1da177e4 | 584 | struct in6_addr *target = NULL; |
fbfe95a4 | 585 | struct inet_peer *peer; |
1da177e4 | 586 | struct rt6_info *rt; |
1da177e4 LT |
587 | |
588 | /* | |
589 | * incoming and outgoing devices are the same | |
590 | * send a redirect. | |
591 | */ | |
592 | ||
593 | rt = (struct rt6_info *) dst; | |
c45a3dfb DM |
594 | if (rt->rt6i_flags & RTF_GATEWAY) |
595 | target = &rt->rt6i_gateway; | |
1da177e4 LT |
596 | else |
597 | target = &hdr->daddr; | |
598 | ||
fd0273d7 | 599 | peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1); |
92d86829 | 600 | |
1da177e4 LT |
601 | /* Limit redirects both by destination (here) |
602 | and by source (inside ndisc_send_redirect) | |
603 | */ | |
fbfe95a4 | 604 | if (inet_peer_xrlim_allow(peer, 1*HZ)) |
4991969a | 605 | ndisc_send_redirect(skb, target); |
1d861aa4 DM |
606 | if (peer) |
607 | inet_putpeer(peer); | |
5bb1ab09 DS |
608 | } else { |
609 | int addrtype = ipv6_addr_type(&hdr->saddr); | |
610 | ||
1da177e4 | 611 | /* This check is security critical. */ |
f81b2e7d YH |
612 | if (addrtype == IPV6_ADDR_ANY || |
613 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
5bb1ab09 DS |
614 | goto error; |
615 | if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
616 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3ffe533c | 617 | ICMPV6_NOT_NEIGHBOUR, 0); |
5bb1ab09 DS |
618 | goto error; |
619 | } | |
1da177e4 LT |
620 | } |
621 | ||
427faee1 | 622 | mtu = ip6_dst_mtu_maybe_forward(dst, true); |
14f3ad6f UW |
623 | if (mtu < IPV6_MIN_MTU) |
624 | mtu = IPV6_MIN_MTU; | |
625 | ||
fe6cc55f | 626 | if (ip6_pkt_too_big(skb, mtu)) { |
1da177e4 LT |
627 | /* Again, force OUTPUT device used as source address */ |
628 | skb->dev = dst->dev; | |
14f3ad6f | 629 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
bdb7cc64 | 630 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INTOOBIGERRORS); |
1d015503 ED |
631 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
632 | IPSTATS_MIB_FRAGFAILS); | |
2edc1a38 | 633 | kfree_skb_reason(skb, SKB_DROP_REASON_PKT_TOO_BIG); |
1da177e4 LT |
634 | return -EMSGSIZE; |
635 | } | |
636 | ||
637 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
1d015503 ED |
638 | __IP6_INC_STATS(net, ip6_dst_idev(dst), |
639 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
640 | goto drop; |
641 | } | |
642 | ||
0660e03f | 643 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
644 | |
645 | /* Mangling hops number delayed to point after skb COW */ | |
1ab1457c | 646 | |
1da177e4 LT |
647 | hdr->hop_limit--; |
648 | ||
29a26a56 EB |
649 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, |
650 | net, NULL, skb, skb->dev, dst->dev, | |
6e23ae2a | 651 | ip6_forward_finish); |
1da177e4 LT |
652 | |
653 | error: | |
bdb7cc64 | 654 | __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
2edc1a38 | 655 | SKB_DR_SET(reason, IP_INADDRERRORS); |
1da177e4 | 656 | drop: |
2edc1a38 | 657 | kfree_skb_reason(skb, reason); |
1da177e4 LT |
658 | return -EINVAL; |
659 | } | |
660 | ||
661 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
662 | { | |
663 | to->pkt_type = from->pkt_type; | |
664 | to->priority = from->priority; | |
665 | to->protocol = from->protocol; | |
adf30907 ED |
666 | skb_dst_drop(to); |
667 | skb_dst_set(to, dst_clone(skb_dst(from))); | |
1da177e4 | 668 | to->dev = from->dev; |
82e91ffe | 669 | to->mark = from->mark; |
1da177e4 | 670 | |
3dd1c9a1 PA |
671 | skb_copy_hash(to, from); |
672 | ||
1da177e4 LT |
673 | #ifdef CONFIG_NET_SCHED |
674 | to->tc_index = from->tc_index; | |
675 | #endif | |
e7ac05f3 | 676 | nf_copy(to, from); |
df5042f4 | 677 | skb_ext_copy(to, from); |
984bc16c | 678 | skb_copy_secmark(to, from); |
1da177e4 LT |
679 | } |
680 | ||
0feca619 PNA |
681 | int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, |
682 | u8 nexthdr, __be32 frag_id, | |
683 | struct ip6_fraglist_iter *iter) | |
684 | { | |
685 | unsigned int first_len; | |
686 | struct frag_hdr *fh; | |
687 | ||
688 | /* BUILD HEADER */ | |
689 | *prevhdr = NEXTHDR_FRAGMENT; | |
690 | iter->tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); | |
691 | if (!iter->tmp_hdr) | |
692 | return -ENOMEM; | |
693 | ||
b7034146 | 694 | iter->frag = skb_shinfo(skb)->frag_list; |
0feca619 PNA |
695 | skb_frag_list_init(skb); |
696 | ||
697 | iter->offset = 0; | |
698 | iter->hlen = hlen; | |
699 | iter->frag_id = frag_id; | |
700 | iter->nexthdr = nexthdr; | |
701 | ||
702 | __skb_pull(skb, hlen); | |
703 | fh = __skb_push(skb, sizeof(struct frag_hdr)); | |
704 | __skb_push(skb, hlen); | |
705 | skb_reset_network_header(skb); | |
706 | memcpy(skb_network_header(skb), iter->tmp_hdr, hlen); | |
707 | ||
708 | fh->nexthdr = nexthdr; | |
709 | fh->reserved = 0; | |
710 | fh->frag_off = htons(IP6_MF); | |
711 | fh->identification = frag_id; | |
712 | ||
713 | first_len = skb_pagelen(skb); | |
714 | skb->data_len = first_len - skb_headlen(skb); | |
715 | skb->len = first_len; | |
716 | ipv6_hdr(skb)->payload_len = htons(first_len - sizeof(struct ipv6hdr)); | |
717 | ||
718 | return 0; | |
719 | } | |
720 | EXPORT_SYMBOL(ip6_fraglist_init); | |
721 | ||
722 | void ip6_fraglist_prepare(struct sk_buff *skb, | |
723 | struct ip6_fraglist_iter *iter) | |
724 | { | |
725 | struct sk_buff *frag = iter->frag; | |
726 | unsigned int hlen = iter->hlen; | |
727 | struct frag_hdr *fh; | |
728 | ||
729 | frag->ip_summed = CHECKSUM_NONE; | |
730 | skb_reset_transport_header(frag); | |
731 | fh = __skb_push(frag, sizeof(struct frag_hdr)); | |
732 | __skb_push(frag, hlen); | |
733 | skb_reset_network_header(frag); | |
734 | memcpy(skb_network_header(frag), iter->tmp_hdr, hlen); | |
735 | iter->offset += skb->len - hlen - sizeof(struct frag_hdr); | |
736 | fh->nexthdr = iter->nexthdr; | |
737 | fh->reserved = 0; | |
738 | fh->frag_off = htons(iter->offset); | |
739 | if (frag->next) | |
740 | fh->frag_off |= htons(IP6_MF); | |
741 | fh->identification = iter->frag_id; | |
742 | ipv6_hdr(frag)->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | |
743 | ip6_copy_metadata(frag, skb); | |
744 | } | |
745 | EXPORT_SYMBOL(ip6_fraglist_prepare); | |
746 | ||
8a6a1f17 PNA |
747 | void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, |
748 | unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, | |
749 | u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state) | |
750 | { | |
751 | state->prevhdr = prevhdr; | |
752 | state->nexthdr = nexthdr; | |
753 | state->frag_id = frag_id; | |
754 | ||
755 | state->hlen = hlen; | |
756 | state->mtu = mtu; | |
757 | ||
758 | state->left = skb->len - hlen; /* Space per frame */ | |
759 | state->ptr = hlen; /* Where to start from */ | |
760 | ||
761 | state->hroom = hdr_room; | |
762 | state->troom = needed_tailroom; | |
763 | ||
764 | state->offset = 0; | |
765 | } | |
766 | EXPORT_SYMBOL(ip6_frag_init); | |
767 | ||
768 | struct sk_buff *ip6_frag_next(struct sk_buff *skb, struct ip6_frag_state *state) | |
769 | { | |
770 | u8 *prevhdr = state->prevhdr, *fragnexthdr_offset; | |
771 | struct sk_buff *frag; | |
772 | struct frag_hdr *fh; | |
773 | unsigned int len; | |
774 | ||
775 | len = state->left; | |
776 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
777 | if (len > state->mtu) | |
778 | len = state->mtu; | |
779 | /* IF: we are not sending up to and including the packet end | |
780 | then align the next start on an eight byte boundary */ | |
781 | if (len < state->left) | |
782 | len &= ~7; | |
783 | ||
784 | /* Allocate buffer */ | |
785 | frag = alloc_skb(len + state->hlen + sizeof(struct frag_hdr) + | |
786 | state->hroom + state->troom, GFP_ATOMIC); | |
787 | if (!frag) | |
788 | return ERR_PTR(-ENOMEM); | |
789 | ||
790 | /* | |
791 | * Set up data on packet | |
792 | */ | |
793 | ||
794 | ip6_copy_metadata(frag, skb); | |
795 | skb_reserve(frag, state->hroom); | |
796 | skb_put(frag, len + state->hlen + sizeof(struct frag_hdr)); | |
797 | skb_reset_network_header(frag); | |
798 | fh = (struct frag_hdr *)(skb_network_header(frag) + state->hlen); | |
799 | frag->transport_header = (frag->network_header + state->hlen + | |
800 | sizeof(struct frag_hdr)); | |
801 | ||
802 | /* | |
803 | * Charge the memory for the fragment to any owner | |
804 | * it might possess | |
805 | */ | |
806 | if (skb->sk) | |
807 | skb_set_owner_w(frag, skb->sk); | |
808 | ||
809 | /* | |
810 | * Copy the packet header into the new buffer. | |
811 | */ | |
812 | skb_copy_from_linear_data(skb, skb_network_header(frag), state->hlen); | |
813 | ||
814 | fragnexthdr_offset = skb_network_header(frag); | |
815 | fragnexthdr_offset += prevhdr - skb_network_header(skb); | |
816 | *fragnexthdr_offset = NEXTHDR_FRAGMENT; | |
817 | ||
818 | /* | |
819 | * Build fragment header. | |
820 | */ | |
821 | fh->nexthdr = state->nexthdr; | |
822 | fh->reserved = 0; | |
823 | fh->identification = state->frag_id; | |
824 | ||
825 | /* | |
826 | * Copy a block of the IP datagram. | |
827 | */ | |
828 | BUG_ON(skb_copy_bits(skb, state->ptr, skb_transport_header(frag), | |
829 | len)); | |
830 | state->left -= len; | |
831 | ||
832 | fh->frag_off = htons(state->offset); | |
833 | if (state->left > 0) | |
834 | fh->frag_off |= htons(IP6_MF); | |
835 | ipv6_hdr(frag)->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | |
836 | ||
837 | state->ptr += len; | |
838 | state->offset += len; | |
839 | ||
840 | return frag; | |
841 | } | |
842 | EXPORT_SYMBOL(ip6_frag_next); | |
843 | ||
7d8c6e39 EB |
844 | int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
845 | int (*output)(struct net *, struct sock *, struct sk_buff *)) | |
1da177e4 | 846 | { |
1da177e4 | 847 | struct sk_buff *frag; |
67ba4152 | 848 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
f60e5990 | 849 | struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
850 | inet6_sk(skb->sk) : NULL; | |
a1ac9c8a | 851 | bool mono_delivery_time = skb->mono_delivery_time; |
8a6a1f17 PNA |
852 | struct ip6_frag_state state; |
853 | unsigned int mtu, hlen, nexthdr_offset; | |
9669fffc | 854 | ktime_t tstamp = skb->tstamp; |
8a6a1f17 | 855 | int hroom, err = 0; |
286c2349 | 856 | __be32 frag_id; |
1da177e4 LT |
857 | u8 *prevhdr, nexthdr = 0; |
858 | ||
7dd7eb95 DM |
859 | err = ip6_find_1stfragopt(skb, &prevhdr); |
860 | if (err < 0) | |
2423496a | 861 | goto fail; |
7dd7eb95 | 862 | hlen = err; |
1da177e4 | 863 | nexthdr = *prevhdr; |
ef0efcd3 | 864 | nexthdr_offset = prevhdr - skb_network_header(skb); |
1da177e4 | 865 | |
628a5c56 | 866 | mtu = ip6_skb_dst_mtu(skb); |
b881ef76 JH |
867 | |
868 | /* We must not fragment if the socket is set to force MTU discovery | |
14f3ad6f | 869 | * or if the skb it not generated by a local socket. |
b881ef76 | 870 | */ |
485fca66 FW |
871 | if (unlikely(!skb->ignore_df && skb->len > mtu)) |
872 | goto fail_toobig; | |
a34a101e | 873 | |
485fca66 FW |
874 | if (IP6CB(skb)->frag_max_size) { |
875 | if (IP6CB(skb)->frag_max_size > mtu) | |
876 | goto fail_toobig; | |
877 | ||
878 | /* don't send fragments larger than what we received */ | |
879 | mtu = IP6CB(skb)->frag_max_size; | |
880 | if (mtu < IPV6_MIN_MTU) | |
881 | mtu = IPV6_MIN_MTU; | |
b881ef76 JH |
882 | } |
883 | ||
d91675f9 YH |
884 | if (np && np->frag_size < mtu) { |
885 | if (np->frag_size) | |
886 | mtu = np->frag_size; | |
887 | } | |
89bc7848 | 888 | if (mtu < hlen + sizeof(struct frag_hdr) + 8) |
b72a2b01 | 889 | goto fail_toobig; |
1e0d69a9 | 890 | mtu -= hlen + sizeof(struct frag_hdr); |
1da177e4 | 891 | |
fd0273d7 MKL |
892 | frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr, |
893 | &ipv6_hdr(skb)->saddr); | |
286c2349 | 894 | |
405c92f7 HFS |
895 | if (skb->ip_summed == CHECKSUM_PARTIAL && |
896 | (err = skb_checksum_help(skb))) | |
897 | goto fail; | |
898 | ||
ef0efcd3 | 899 | prevhdr = skb_network_header(skb) + nexthdr_offset; |
1d325d21 | 900 | hroom = LL_RESERVED_SPACE(rt->dst.dev); |
21dc3301 | 901 | if (skb_has_frag_list(skb)) { |
c72d8cda | 902 | unsigned int first_len = skb_pagelen(skb); |
0feca619 | 903 | struct ip6_fraglist_iter iter; |
3d13008e | 904 | struct sk_buff *frag2; |
1da177e4 LT |
905 | |
906 | if (first_len - hlen > mtu || | |
907 | ((first_len - hlen) & 7) || | |
1d325d21 FW |
908 | skb_cloned(skb) || |
909 | skb_headroom(skb) < (hroom + sizeof(struct frag_hdr))) | |
1da177e4 LT |
910 | goto slow_path; |
911 | ||
4d9092bb | 912 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
913 | /* Correct geometry. */ |
914 | if (frag->len > mtu || | |
915 | ((frag->len & 7) && frag->next) || | |
1d325d21 | 916 | skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr))) |
3d13008e | 917 | goto slow_path_clean; |
1da177e4 | 918 | |
1da177e4 LT |
919 | /* Partially cloned skb? */ |
920 | if (skb_shared(frag)) | |
3d13008e | 921 | goto slow_path_clean; |
2fdba6b0 HX |
922 | |
923 | BUG_ON(frag->sk); | |
924 | if (skb->sk) { | |
2fdba6b0 HX |
925 | frag->sk = skb->sk; |
926 | frag->destructor = sock_wfree; | |
2fdba6b0 | 927 | } |
3d13008e | 928 | skb->truesize -= frag->truesize; |
1da177e4 LT |
929 | } |
930 | ||
0feca619 PNA |
931 | err = ip6_fraglist_init(skb, hlen, prevhdr, nexthdr, frag_id, |
932 | &iter); | |
933 | if (err < 0) | |
1d325d21 | 934 | goto fail; |
a11d206d | 935 | |
803e8486 ED |
936 | /* We prevent @rt from being freed. */ |
937 | rcu_read_lock(); | |
938 | ||
1da177e4 LT |
939 | for (;;) { |
940 | /* Prepare header of the next frame, | |
941 | * before previous one went down. */ | |
0feca619 PNA |
942 | if (iter.frag) |
943 | ip6_fraglist_prepare(skb, &iter); | |
1ab1457c | 944 | |
a1ac9c8a | 945 | skb_set_delivery_time(skb, tstamp, mono_delivery_time); |
7d8c6e39 | 946 | err = output(net, sk, skb); |
67ba4152 | 947 | if (!err) |
d8d1f30b | 948 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 949 | IPSTATS_MIB_FRAGCREATES); |
dafee490 | 950 | |
0feca619 | 951 | if (err || !iter.frag) |
1da177e4 LT |
952 | break; |
953 | ||
0feca619 | 954 | skb = ip6_fraglist_next(&iter); |
1da177e4 LT |
955 | } |
956 | ||
0feca619 | 957 | kfree(iter.tmp_hdr); |
1da177e4 LT |
958 | |
959 | if (err == 0) { | |
d8d1f30b | 960 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 961 | IPSTATS_MIB_FRAGOKS); |
803e8486 | 962 | rcu_read_unlock(); |
1da177e4 LT |
963 | return 0; |
964 | } | |
965 | ||
b7034146 | 966 | kfree_skb_list(iter.frag); |
1da177e4 | 967 | |
d8d1f30b | 968 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
3bd653c8 | 969 | IPSTATS_MIB_FRAGFAILS); |
803e8486 | 970 | rcu_read_unlock(); |
1da177e4 | 971 | return err; |
3d13008e ED |
972 | |
973 | slow_path_clean: | |
974 | skb_walk_frags(skb, frag2) { | |
975 | if (frag2 == frag) | |
976 | break; | |
977 | frag2->sk = NULL; | |
978 | frag2->destructor = NULL; | |
979 | skb->truesize += frag2->truesize; | |
980 | } | |
1da177e4 LT |
981 | } |
982 | ||
983 | slow_path: | |
1da177e4 LT |
984 | /* |
985 | * Fragment the datagram. | |
986 | */ | |
987 | ||
8a6a1f17 PNA |
988 | ip6_frag_init(skb, hlen, mtu, rt->dst.dev->needed_tailroom, |
989 | LL_RESERVED_SPACE(rt->dst.dev), prevhdr, nexthdr, frag_id, | |
990 | &state); | |
1da177e4 LT |
991 | |
992 | /* | |
993 | * Keep copying data until we run out. | |
994 | */ | |
1da177e4 | 995 | |
8a6a1f17 PNA |
996 | while (state.left > 0) { |
997 | frag = ip6_frag_next(skb, &state); | |
998 | if (IS_ERR(frag)) { | |
999 | err = PTR_ERR(frag); | |
1da177e4 LT |
1000 | goto fail; |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | /* |
1004 | * Put this fragment into the sending queue. | |
1005 | */ | |
a1ac9c8a | 1006 | skb_set_delivery_time(frag, tstamp, mono_delivery_time); |
7d8c6e39 | 1007 | err = output(net, sk, frag); |
1da177e4 LT |
1008 | if (err) |
1009 | goto fail; | |
dafee490 | 1010 | |
adf30907 | 1011 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
3bd653c8 | 1012 | IPSTATS_MIB_FRAGCREATES); |
1da177e4 | 1013 | } |
adf30907 | 1014 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 1015 | IPSTATS_MIB_FRAGOKS); |
808db80a | 1016 | consume_skb(skb); |
1da177e4 LT |
1017 | return err; |
1018 | ||
485fca66 FW |
1019 | fail_toobig: |
1020 | if (skb->sk && dst_allfrag(skb_dst(skb))) | |
aba54656 | 1021 | sk_gso_disable(skb->sk); |
485fca66 | 1022 | |
485fca66 FW |
1023 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1024 | err = -EMSGSIZE; | |
1025 | ||
1da177e4 | 1026 | fail: |
adf30907 | 1027 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
a11d206d | 1028 | IPSTATS_MIB_FRAGFAILS); |
1ab1457c | 1029 | kfree_skb(skb); |
1da177e4 LT |
1030 | return err; |
1031 | } | |
1032 | ||
b71d1d42 ED |
1033 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
1034 | const struct in6_addr *fl_addr, | |
1035 | const struct in6_addr *addr_cache) | |
cf6b1982 | 1036 | { |
a02cec21 | 1037 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
63159f29 | 1038 | (!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache)); |
cf6b1982 YH |
1039 | } |
1040 | ||
497c615a HX |
1041 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
1042 | struct dst_entry *dst, | |
b71d1d42 | 1043 | const struct flowi6 *fl6) |
1da177e4 | 1044 | { |
497c615a | 1045 | struct ipv6_pinfo *np = inet6_sk(sk); |
a963a37d | 1046 | struct rt6_info *rt; |
1da177e4 | 1047 | |
497c615a HX |
1048 | if (!dst) |
1049 | goto out; | |
1050 | ||
a963a37d ED |
1051 | if (dst->ops->family != AF_INET6) { |
1052 | dst_release(dst); | |
1053 | return NULL; | |
1054 | } | |
1055 | ||
1056 | rt = (struct rt6_info *)dst; | |
497c615a HX |
1057 | /* Yes, checking route validity in not connected |
1058 | * case is not very simple. Take into account, | |
1059 | * that we do not support routing by source, TOS, | |
67ba4152 | 1060 | * and MSG_DONTROUTE --ANK (980726) |
497c615a | 1061 | * |
cf6b1982 YH |
1062 | * 1. ip6_rt_check(): If route was host route, |
1063 | * check that cached destination is current. | |
497c615a HX |
1064 | * If it is network route, we still may |
1065 | * check its validity using saved pointer | |
1066 | * to the last used address: daddr_cache. | |
1067 | * We do not want to save whole address now, | |
1068 | * (because main consumer of this service | |
1069 | * is tcp, which has not this problem), | |
1070 | * so that the last trick works only on connected | |
1071 | * sockets. | |
1072 | * 2. oif also should be the same. | |
1073 | */ | |
4c9483b2 | 1074 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
8e1ef0a9 | 1075 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1076 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
8e1ef0a9 | 1077 | #endif |
40867d74 | 1078 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) { |
497c615a HX |
1079 | dst_release(dst); |
1080 | dst = NULL; | |
1da177e4 LT |
1081 | } |
1082 | ||
497c615a HX |
1083 | out: |
1084 | return dst; | |
1085 | } | |
1086 | ||
3aef934f | 1087 | static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk, |
4c9483b2 | 1088 | struct dst_entry **dst, struct flowi6 *fl6) |
497c615a | 1089 | { |
69cce1d1 DM |
1090 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
1091 | struct neighbour *n; | |
97cac082 | 1092 | struct rt6_info *rt; |
69cce1d1 DM |
1093 | #endif |
1094 | int err; | |
6f21c96a | 1095 | int flags = 0; |
497c615a | 1096 | |
e16e888b MS |
1097 | /* The correct way to handle this would be to do |
1098 | * ip6_route_get_saddr, and then ip6_route_output; however, | |
1099 | * the route-specific preferred source forces the | |
1100 | * ip6_route_output call _before_ ip6_route_get_saddr. | |
1101 | * | |
1102 | * In source specific routing (no src=any default route), | |
1103 | * ip6_route_output will fail given src=any saddr, though, so | |
1104 | * that's why we try it again later. | |
1105 | */ | |
c305b9e6 | 1106 | if (ipv6_addr_any(&fl6->saddr)) { |
a68886a6 | 1107 | struct fib6_info *from; |
e16e888b | 1108 | struct rt6_info *rt; |
1da177e4 | 1109 | |
c305b9e6 | 1110 | *dst = ip6_route_output(net, sk, fl6); |
e16e888b | 1111 | rt = (*dst)->error ? NULL : (struct rt6_info *)*dst; |
a68886a6 DA |
1112 | |
1113 | rcu_read_lock(); | |
1114 | from = rt ? rcu_dereference(rt->from) : NULL; | |
1115 | err = ip6_route_get_saddr(net, from, &fl6->daddr, | |
c3968a85 DW |
1116 | sk ? inet6_sk(sk)->srcprefs : 0, |
1117 | &fl6->saddr); | |
a68886a6 DA |
1118 | rcu_read_unlock(); |
1119 | ||
44456d37 | 1120 | if (err) |
1da177e4 | 1121 | goto out_err_release; |
e16e888b MS |
1122 | |
1123 | /* If we had an erroneous initial result, pretend it | |
1124 | * never existed and let the SA-enabled version take | |
1125 | * over. | |
1126 | */ | |
c305b9e6 | 1127 | if ((*dst)->error) { |
e16e888b MS |
1128 | dst_release(*dst); |
1129 | *dst = NULL; | |
1130 | } | |
6f21c96a PA |
1131 | |
1132 | if (fl6->flowi6_oif) | |
1133 | flags |= RT6_LOOKUP_F_IFACE; | |
1da177e4 LT |
1134 | } |
1135 | ||
e16e888b | 1136 | if (!*dst) |
6f21c96a | 1137 | *dst = ip6_route_output_flags(net, sk, fl6, flags); |
e16e888b MS |
1138 | |
1139 | err = (*dst)->error; | |
1140 | if (err) | |
1141 | goto out_err_release; | |
1142 | ||
95c385b4 | 1143 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
e550dfb0 NH |
1144 | /* |
1145 | * Here if the dst entry we've looked up | |
1146 | * has a neighbour entry that is in the INCOMPLETE | |
1147 | * state and the src address from the flow is | |
1148 | * marked as OPTIMISTIC, we release the found | |
1149 | * dst entry and replace it instead with the | |
1150 | * dst entry of the nexthop router | |
1151 | */ | |
c56bf6fe | 1152 | rt = (struct rt6_info *) *dst; |
707be1ff | 1153 | rcu_read_lock_bh(); |
2647a9b0 MKL |
1154 | n = __ipv6_neigh_lookup_noref(rt->dst.dev, |
1155 | rt6_nexthop(rt, &fl6->daddr)); | |
707be1ff YH |
1156 | err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0; |
1157 | rcu_read_unlock_bh(); | |
1158 | ||
1159 | if (err) { | |
e550dfb0 | 1160 | struct inet6_ifaddr *ifp; |
4c9483b2 | 1161 | struct flowi6 fl_gw6; |
e550dfb0 NH |
1162 | int redirect; |
1163 | ||
4c9483b2 | 1164 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
e550dfb0 NH |
1165 | (*dst)->dev, 1); |
1166 | ||
1167 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
1168 | if (ifp) | |
1169 | in6_ifa_put(ifp); | |
1170 | ||
1171 | if (redirect) { | |
1172 | /* | |
1173 | * We need to get the dst entry for the | |
1174 | * default router instead | |
1175 | */ | |
1176 | dst_release(*dst); | |
4c9483b2 DM |
1177 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
1178 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
1179 | *dst = ip6_route_output(net, sk, &fl_gw6); | |
e5d08d71 IM |
1180 | err = (*dst)->error; |
1181 | if (err) | |
e550dfb0 | 1182 | goto out_err_release; |
95c385b4 | 1183 | } |
e550dfb0 | 1184 | } |
95c385b4 | 1185 | #endif |
ec5e3b0a | 1186 | if (ipv6_addr_v4mapped(&fl6->saddr) && |
00ea1cee WB |
1187 | !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr))) { |
1188 | err = -EAFNOSUPPORT; | |
1189 | goto out_err_release; | |
1190 | } | |
95c385b4 | 1191 | |
1da177e4 LT |
1192 | return 0; |
1193 | ||
1194 | out_err_release: | |
1195 | dst_release(*dst); | |
1196 | *dst = NULL; | |
8a966fc0 | 1197 | |
0d240e78 DA |
1198 | if (err == -ENETUNREACH) |
1199 | IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES); | |
1da177e4 LT |
1200 | return err; |
1201 | } | |
34a0b3cd | 1202 | |
497c615a HX |
1203 | /** |
1204 | * ip6_dst_lookup - perform route lookup on flow | |
b51cd7c8 | 1205 | * @net: Network namespace to perform lookup in |
497c615a HX |
1206 | * @sk: socket which provides route info |
1207 | * @dst: pointer to dst_entry * for result | |
4c9483b2 | 1208 | * @fl6: flow to lookup |
497c615a HX |
1209 | * |
1210 | * This function performs a route lookup on the given flow. | |
1211 | * | |
1212 | * It returns zero on success, or a standard errno code on error. | |
1213 | */ | |
343d60aa RP |
1214 | int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, |
1215 | struct flowi6 *fl6) | |
497c615a HX |
1216 | { |
1217 | *dst = NULL; | |
343d60aa | 1218 | return ip6_dst_lookup_tail(net, sk, dst, fl6); |
497c615a | 1219 | } |
3cf3dc6c ACM |
1220 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
1221 | ||
497c615a | 1222 | /** |
68d0c6d3 | 1223 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
b51cd7c8 | 1224 | * @net: Network namespace to perform lookup in |
68d0c6d3 | 1225 | * @sk: socket which provides route info |
4c9483b2 | 1226 | * @fl6: flow to lookup |
68d0c6d3 | 1227 | * @final_dst: final destination address for ipsec lookup |
68d0c6d3 DM |
1228 | * |
1229 | * This function performs a route lookup on the given flow. | |
1230 | * | |
1231 | * It returns a valid dst pointer on success, or a pointer encoded | |
1232 | * error code. | |
1233 | */ | |
c4e85f73 | 1234 | struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 1235 | const struct in6_addr *final_dst) |
68d0c6d3 DM |
1236 | { |
1237 | struct dst_entry *dst = NULL; | |
1238 | int err; | |
1239 | ||
c4e85f73 | 1240 | err = ip6_dst_lookup_tail(net, sk, &dst, fl6); |
68d0c6d3 DM |
1241 | if (err) |
1242 | return ERR_PTR(err); | |
1243 | if (final_dst) | |
4e3fd7a0 | 1244 | fl6->daddr = *final_dst; |
2774c131 | 1245 | |
c4e85f73 | 1246 | return xfrm_lookup_route(net, dst, flowi6_to_flowi(fl6), sk, 0); |
68d0c6d3 DM |
1247 | } |
1248 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
1249 | ||
1250 | /** | |
1251 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
497c615a | 1252 | * @sk: socket which provides the dst cache and route info |
4c9483b2 | 1253 | * @fl6: flow to lookup |
68d0c6d3 | 1254 | * @final_dst: final destination address for ipsec lookup |
96818159 | 1255 | * @connected: whether @sk is connected or not |
497c615a HX |
1256 | * |
1257 | * This function performs a route lookup on the given flow with the | |
1258 | * possibility of using the cached route in the socket if it is valid. | |
1259 | * It will take the socket dst lock when operating on the dst cache. | |
1260 | * As a result, this function can only be used in process context. | |
1261 | * | |
96818159 AK |
1262 | * In addition, for a connected socket, cache the dst in the socket |
1263 | * if the current cache is not valid. | |
1264 | * | |
68d0c6d3 DM |
1265 | * It returns a valid dst pointer on success, or a pointer encoded |
1266 | * error code. | |
497c615a | 1267 | */ |
4c9483b2 | 1268 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
96818159 AK |
1269 | const struct in6_addr *final_dst, |
1270 | bool connected) | |
497c615a | 1271 | { |
68d0c6d3 | 1272 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
497c615a | 1273 | |
4c9483b2 | 1274 | dst = ip6_sk_dst_check(sk, dst, fl6); |
96818159 AK |
1275 | if (dst) |
1276 | return dst; | |
1277 | ||
c4e85f73 | 1278 | dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_dst); |
96818159 AK |
1279 | if (connected && !IS_ERR(dst)) |
1280 | ip6_sk_dst_store_flow(sk, dst_clone(dst), fl6); | |
68d0c6d3 | 1281 | |
00bc0ef5 | 1282 | return dst; |
497c615a | 1283 | } |
68d0c6d3 | 1284 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
497c615a | 1285 | |
571912c6 MV |
1286 | /** |
1287 | * ip6_dst_lookup_tunnel - perform route lookup on tunnel | |
1288 | * @skb: Packet for which lookup is done | |
1289 | * @dev: Tunnel device | |
1290 | * @net: Network namespace of tunnel device | |
b51cd7c8 | 1291 | * @sock: Socket which provides route info |
571912c6 MV |
1292 | * @saddr: Memory to store the src ip address |
1293 | * @info: Tunnel information | |
1294 | * @protocol: IP protocol | |
b51cd7c8 | 1295 | * @use_cache: Flag to enable cache usage |
571912c6 MV |
1296 | * This function performs a route lookup on a tunnel |
1297 | * | |
1298 | * It returns a valid dst pointer and stores src address to be used in | |
1299 | * tunnel in param saddr on success, else a pointer encoded error code. | |
1300 | */ | |
1301 | ||
1302 | struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb, | |
1303 | struct net_device *dev, | |
1304 | struct net *net, | |
1305 | struct socket *sock, | |
1306 | struct in6_addr *saddr, | |
1307 | const struct ip_tunnel_info *info, | |
1308 | u8 protocol, | |
1309 | bool use_cache) | |
1310 | { | |
1311 | struct dst_entry *dst = NULL; | |
1312 | #ifdef CONFIG_DST_CACHE | |
1313 | struct dst_cache *dst_cache; | |
1314 | #endif | |
1315 | struct flowi6 fl6; | |
1316 | __u8 prio; | |
1317 | ||
1318 | #ifdef CONFIG_DST_CACHE | |
1319 | dst_cache = (struct dst_cache *)&info->dst_cache; | |
1320 | if (use_cache) { | |
1321 | dst = dst_cache_get_ip6(dst_cache, saddr); | |
1322 | if (dst) | |
1323 | return dst; | |
1324 | } | |
1325 | #endif | |
1326 | memset(&fl6, 0, sizeof(fl6)); | |
1327 | fl6.flowi6_mark = skb->mark; | |
1328 | fl6.flowi6_proto = protocol; | |
1329 | fl6.daddr = info->key.u.ipv6.dst; | |
1330 | fl6.saddr = info->key.u.ipv6.src; | |
1331 | prio = info->key.tos; | |
ab7e2e0d | 1332 | fl6.flowlabel = ip6_make_flowinfo(prio, info->key.label); |
571912c6 MV |
1333 | |
1334 | dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6, | |
1335 | NULL); | |
1336 | if (IS_ERR(dst)) { | |
1337 | netdev_dbg(dev, "no route to %pI6\n", &fl6.daddr); | |
1338 | return ERR_PTR(-ENETUNREACH); | |
1339 | } | |
1340 | if (dst->dev == dev) { /* is this necessary? */ | |
1341 | netdev_dbg(dev, "circular route to %pI6\n", &fl6.daddr); | |
1342 | dst_release(dst); | |
1343 | return ERR_PTR(-ELOOP); | |
1344 | } | |
1345 | #ifdef CONFIG_DST_CACHE | |
1346 | if (use_cache) | |
1347 | dst_cache_set_ip6(dst_cache, dst, &fl6.saddr); | |
1348 | #endif | |
1349 | *saddr = fl6.saddr; | |
1350 | return dst; | |
1351 | } | |
1352 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_tunnel); | |
1353 | ||
0178b695 HX |
1354 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
1355 | gfp_t gfp) | |
1356 | { | |
1357 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1358 | } | |
1359 | ||
1360 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
1361 | gfp_t gfp) | |
1362 | { | |
1363 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
1364 | } | |
1365 | ||
75a493e6 | 1366 | static void ip6_append_data_mtu(unsigned int *mtu, |
0c183379 G |
1367 | int *maxfraglen, |
1368 | unsigned int fragheaderlen, | |
1369 | struct sk_buff *skb, | |
75a493e6 | 1370 | struct rt6_info *rt, |
e367c2d0 | 1371 | unsigned int orig_mtu) |
0c183379 G |
1372 | { |
1373 | if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { | |
63159f29 | 1374 | if (!skb) { |
0c183379 | 1375 | /* first fragment, reserve header_len */ |
e367c2d0 | 1376 | *mtu = orig_mtu - rt->dst.header_len; |
0c183379 G |
1377 | |
1378 | } else { | |
1379 | /* | |
1380 | * this fragment is not first, the headers | |
1381 | * space is regarded as data space. | |
1382 | */ | |
e367c2d0 | 1383 | *mtu = orig_mtu; |
0c183379 G |
1384 | } |
1385 | *maxfraglen = ((*mtu - fragheaderlen) & ~7) | |
1386 | + fragheaderlen - sizeof(struct frag_hdr); | |
1387 | } | |
1388 | } | |
1389 | ||
366e41d9 | 1390 | static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork, |
26879da5 | 1391 | struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6, |
f37a4cc6 | 1392 | struct rt6_info *rt) |
366e41d9 VY |
1393 | { |
1394 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1395 | unsigned int mtu; | |
d656b2ea | 1396 | struct ipv6_txoptions *nopt, *opt = ipc6->opt; |
366e41d9 | 1397 | |
40ac240c PB |
1398 | /* callers pass dst together with a reference, set it first so |
1399 | * ip6_cork_release() can put it down even in case of an error. | |
1400 | */ | |
1401 | cork->base.dst = &rt->dst; | |
1402 | ||
366e41d9 VY |
1403 | /* |
1404 | * setup for corking | |
1405 | */ | |
1406 | if (opt) { | |
1407 | if (WARN_ON(v6_cork->opt)) | |
1408 | return -EINVAL; | |
1409 | ||
d656b2ea PB |
1410 | nopt = v6_cork->opt = kzalloc(sizeof(*opt), sk->sk_allocation); |
1411 | if (unlikely(!nopt)) | |
366e41d9 VY |
1412 | return -ENOBUFS; |
1413 | ||
d656b2ea PB |
1414 | nopt->tot_len = sizeof(*opt); |
1415 | nopt->opt_flen = opt->opt_flen; | |
1416 | nopt->opt_nflen = opt->opt_nflen; | |
366e41d9 | 1417 | |
d656b2ea PB |
1418 | nopt->dst0opt = ip6_opt_dup(opt->dst0opt, sk->sk_allocation); |
1419 | if (opt->dst0opt && !nopt->dst0opt) | |
366e41d9 VY |
1420 | return -ENOBUFS; |
1421 | ||
d656b2ea PB |
1422 | nopt->dst1opt = ip6_opt_dup(opt->dst1opt, sk->sk_allocation); |
1423 | if (opt->dst1opt && !nopt->dst1opt) | |
366e41d9 VY |
1424 | return -ENOBUFS; |
1425 | ||
d656b2ea PB |
1426 | nopt->hopopt = ip6_opt_dup(opt->hopopt, sk->sk_allocation); |
1427 | if (opt->hopopt && !nopt->hopopt) | |
366e41d9 VY |
1428 | return -ENOBUFS; |
1429 | ||
d656b2ea PB |
1430 | nopt->srcrt = ip6_rthdr_dup(opt->srcrt, sk->sk_allocation); |
1431 | if (opt->srcrt && !nopt->srcrt) | |
366e41d9 VY |
1432 | return -ENOBUFS; |
1433 | ||
1434 | /* need source address above miyazawa*/ | |
1435 | } | |
26879da5 WW |
1436 | v6_cork->hop_limit = ipc6->hlimit; |
1437 | v6_cork->tclass = ipc6->tclass; | |
366e41d9 VY |
1438 | if (rt->dst.flags & DST_XFRM_TUNNEL) |
1439 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? | |
749439bf | 1440 | READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst); |
366e41d9 VY |
1441 | else |
1442 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? | |
c02b3741 | 1443 | READ_ONCE(rt->dst.dev->mtu) : dst_mtu(xfrm_dst_path(&rt->dst)); |
366e41d9 VY |
1444 | if (np->frag_size < mtu) { |
1445 | if (np->frag_size) | |
1446 | mtu = np->frag_size; | |
1447 | } | |
1448 | cork->base.fragsize = mtu; | |
fbf47813 | 1449 | cork->base.gso_size = ipc6->gso_size; |
678ca42d | 1450 | cork->base.tx_flags = 0; |
c6af0c22 | 1451 | cork->base.mark = ipc6->sockc.mark; |
678ca42d | 1452 | sock_tx_timestamp(sk, ipc6->sockc.tsflags, &cork->base.tx_flags); |
bec1f6f6 | 1453 | |
0f6c480f | 1454 | if (dst_allfrag(xfrm_dst_path(&rt->dst))) |
366e41d9 VY |
1455 | cork->base.flags |= IPCORK_ALLFRAG; |
1456 | cork->base.length = 0; | |
1457 | ||
5fdaa88d | 1458 | cork->base.transmit_time = ipc6->sockc.transmit_time; |
a818f75e | 1459 | |
366e41d9 VY |
1460 | return 0; |
1461 | } | |
1462 | ||
0bbe84a6 | 1463 | static int __ip6_append_data(struct sock *sk, |
0bbe84a6 | 1464 | struct sk_buff_head *queue, |
f3b46a3e | 1465 | struct inet_cork_full *cork_full, |
0bbe84a6 VY |
1466 | struct inet6_cork *v6_cork, |
1467 | struct page_frag *pfrag, | |
1468 | int getfrag(void *from, char *to, int offset, | |
1469 | int len, int odd, struct sk_buff *skb), | |
f93431c8 | 1470 | void *from, size_t length, int transhdrlen, |
5fdaa88d | 1471 | unsigned int flags, struct ipcm6_cookie *ipc6) |
1da177e4 | 1472 | { |
0c183379 | 1473 | struct sk_buff *skb, *skb_prev = NULL; |
f3b46a3e | 1474 | struct inet_cork *cork = &cork_full->base; |
f37a4cc6 | 1475 | struct flowi6 *fl6 = &cork_full->fl.u.ip6; |
10b8a3de | 1476 | unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu; |
b5947e5d | 1477 | struct ubuf_info *uarg = NULL; |
0bbe84a6 VY |
1478 | int exthdrlen = 0; |
1479 | int dst_exthdrlen = 0; | |
1da177e4 | 1480 | int hh_len; |
1da177e4 LT |
1481 | int copy; |
1482 | int err; | |
1483 | int offset = 0; | |
773ba4fe | 1484 | bool zc = false; |
09c2d251 | 1485 | u32 tskey = 0; |
0bbe84a6 VY |
1486 | struct rt6_info *rt = (struct rt6_info *)cork->dst; |
1487 | struct ipv6_txoptions *opt = v6_cork->opt; | |
32dce968 | 1488 | int csummode = CHECKSUM_NONE; |
682b1a9d | 1489 | unsigned int maxnonfragsize, headersize; |
1f4c6eb2 | 1490 | unsigned int wmem_alloc_delta = 0; |
100f6d8e | 1491 | bool paged, extra_uref = false; |
1da177e4 | 1492 | |
0bbe84a6 VY |
1493 | skb = skb_peek_tail(queue); |
1494 | if (!skb) { | |
1495 | exthdrlen = opt ? opt->opt_flen : 0; | |
7efdba5b | 1496 | dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; |
1da177e4 | 1497 | } |
0bbe84a6 | 1498 | |
15e36f5b | 1499 | paged = !!cork->gso_size; |
bec1f6f6 | 1500 | mtu = cork->gso_size ? IP6_MAX_MTU : cork->fragsize; |
e367c2d0 | 1501 | orig_mtu = mtu; |
1da177e4 | 1502 | |
8ca5a579 | 1503 | if (cork->tx_flags & SKBTX_ANY_TSTAMP && |
678ca42d | 1504 | sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) |
a1cdec57 | 1505 | tskey = atomic_inc_return(&sk->sk_tskey) - 1; |
678ca42d | 1506 | |
d8d1f30b | 1507 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4 | 1508 | |
a1b05140 | 1509 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
b4ce9277 | 1510 | (opt ? opt->opt_nflen : 0); |
1da177e4 | 1511 | |
682b1a9d HFS |
1512 | headersize = sizeof(struct ipv6hdr) + |
1513 | (opt ? opt->opt_flen + opt->opt_nflen : 0) + | |
1514 | (dst_allfrag(&rt->dst) ? | |
1515 | sizeof(struct frag_hdr) : 0) + | |
1516 | rt->rt6i_nfheader_len; | |
1517 | ||
5e34af41 TS |
1518 | if (mtu <= fragheaderlen || |
1519 | ((mtu - fragheaderlen) & ~7) + fragheaderlen <= sizeof(struct frag_hdr)) | |
6596a022 JB |
1520 | goto emsgsize; |
1521 | ||
1522 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - | |
1523 | sizeof(struct frag_hdr); | |
1524 | ||
10b8a3de PA |
1525 | /* as per RFC 7112 section 5, the entire IPv6 Header Chain must fit |
1526 | * the first fragment | |
1527 | */ | |
1528 | if (headersize + transhdrlen > mtu) | |
1529 | goto emsgsize; | |
1530 | ||
26879da5 | 1531 | if (cork->length + length > mtu - headersize && ipc6->dontfrag && |
682b1a9d | 1532 | (sk->sk_protocol == IPPROTO_UDP || |
13651224 | 1533 | sk->sk_protocol == IPPROTO_ICMPV6 || |
682b1a9d HFS |
1534 | sk->sk_protocol == IPPROTO_RAW)) { |
1535 | ipv6_local_rxpmtu(sk, fl6, mtu - headersize + | |
1536 | sizeof(struct ipv6hdr)); | |
1537 | goto emsgsize; | |
1538 | } | |
4df98e76 | 1539 | |
682b1a9d HFS |
1540 | if (ip6_sk_ignore_df(sk)) |
1541 | maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN; | |
1542 | else | |
1543 | maxnonfragsize = mtu; | |
4df98e76 | 1544 | |
682b1a9d | 1545 | if (cork->length + length > maxnonfragsize - headersize) { |
4df98e76 | 1546 | emsgsize: |
10b8a3de PA |
1547 | pmtu = max_t(int, mtu - headersize + sizeof(struct ipv6hdr), 0); |
1548 | ipv6_local_error(sk, EMSGSIZE, fl6, pmtu); | |
682b1a9d | 1549 | return -EMSGSIZE; |
1da177e4 LT |
1550 | } |
1551 | ||
682b1a9d HFS |
1552 | /* CHECKSUM_PARTIAL only with no extension headers and when |
1553 | * we are not going to fragment | |
1554 | */ | |
1555 | if (transhdrlen && sk->sk_protocol == IPPROTO_UDP && | |
1556 | headersize == sizeof(struct ipv6hdr) && | |
2b89ed65 | 1557 | length <= mtu - headersize && |
bec1f6f6 | 1558 | (!(flags & MSG_MORE) || cork->gso_size) && |
c8cd0989 | 1559 | rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM)) |
682b1a9d HFS |
1560 | csummode = CHECKSUM_PARTIAL; |
1561 | ||
1fd3ae8c PB |
1562 | if ((flags & MSG_ZEROCOPY) && length) { |
1563 | struct msghdr *msg = from; | |
1564 | ||
1565 | if (getfrag == ip_generic_getfrag && msg->msg_ubuf) { | |
1566 | if (skb_zcopy(skb) && msg->msg_ubuf != skb_zcopy(skb)) | |
1567 | return -EINVAL; | |
1568 | ||
1569 | /* Leave uarg NULL if can't zerocopy, callers should | |
1570 | * be able to handle it. | |
1571 | */ | |
1572 | if ((rt->dst.dev->features & NETIF_F_SG) && | |
1573 | csummode == CHECKSUM_PARTIAL) { | |
1574 | paged = true; | |
1575 | zc = true; | |
1576 | uarg = msg->msg_ubuf; | |
1577 | } | |
1578 | } else if (sock_flag(sk, SOCK_ZEROCOPY)) { | |
1579 | uarg = msg_zerocopy_realloc(sk, length, skb_zcopy(skb)); | |
1580 | if (!uarg) | |
1581 | return -ENOBUFS; | |
1582 | extra_uref = !skb_zcopy(skb); /* only ref on new uarg */ | |
1583 | if (rt->dst.dev->features & NETIF_F_SG && | |
1584 | csummode == CHECKSUM_PARTIAL) { | |
1585 | paged = true; | |
1586 | zc = true; | |
1587 | } else { | |
e7d2b510 | 1588 | uarg_to_msgzc(uarg)->zerocopy = 0; |
1fd3ae8c PB |
1589 | skb_zcopy_set(skb, uarg, &extra_uref); |
1590 | } | |
b5947e5d WB |
1591 | } |
1592 | } | |
1593 | ||
1da177e4 LT |
1594 | /* |
1595 | * Let's try using as much space as possible. | |
1596 | * Use MTU if total length of the message fits into the MTU. | |
1597 | * Otherwise, we need to reserve fragment header and | |
1598 | * fragment alignment (= 8-15 octects, in total). | |
1599 | * | |
634a63e7 | 1600 | * Note that we may need to "move" the data from the tail |
1ab1457c | 1601 | * of the buffer to the new fragment when we split |
1da177e4 LT |
1602 | * the message. |
1603 | * | |
1ab1457c | 1604 | * FIXME: It may be fragmented into multiple chunks |
1da177e4 LT |
1605 | * at once if non-fragmentable extension headers |
1606 | * are too large. | |
1ab1457c | 1607 | * --yoshfuji |
1da177e4 LT |
1608 | */ |
1609 | ||
2811ebac | 1610 | cork->length += length; |
2811ebac | 1611 | if (!skb) |
1da177e4 LT |
1612 | goto alloc_new_skb; |
1613 | ||
1614 | while (length > 0) { | |
1615 | /* Check if the remaining data fits into current packet. */ | |
bdc712b4 | 1616 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
1da177e4 LT |
1617 | if (copy < length) |
1618 | copy = maxfraglen - skb->len; | |
1619 | ||
1620 | if (copy <= 0) { | |
1621 | char *data; | |
1622 | unsigned int datalen; | |
1623 | unsigned int fraglen; | |
1624 | unsigned int fraggap; | |
6d123b81 | 1625 | unsigned int alloclen, alloc_extra; |
aba36930 | 1626 | unsigned int pagedlen; |
1da177e4 | 1627 | alloc_new_skb: |
1da177e4 | 1628 | /* There's no room in the current skb */ |
0c183379 G |
1629 | if (skb) |
1630 | fraggap = skb->len - maxfraglen; | |
1da177e4 LT |
1631 | else |
1632 | fraggap = 0; | |
0c183379 | 1633 | /* update mtu and maxfraglen if necessary */ |
63159f29 | 1634 | if (!skb || !skb_prev) |
0c183379 | 1635 | ip6_append_data_mtu(&mtu, &maxfraglen, |
75a493e6 | 1636 | fragheaderlen, skb, rt, |
e367c2d0 | 1637 | orig_mtu); |
0c183379 G |
1638 | |
1639 | skb_prev = skb; | |
1da177e4 LT |
1640 | |
1641 | /* | |
1642 | * If remaining data exceeds the mtu, | |
1643 | * we know we need more fragment(s). | |
1644 | */ | |
1645 | datalen = length + fraggap; | |
1da177e4 | 1646 | |
0c183379 G |
1647 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
1648 | datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; | |
15e36f5b | 1649 | fraglen = datalen + fragheaderlen; |
aba36930 | 1650 | pagedlen = 0; |
15e36f5b | 1651 | |
6d123b81 JK |
1652 | alloc_extra = hh_len; |
1653 | alloc_extra += dst_exthdrlen; | |
1654 | alloc_extra += rt->dst.trailer_len; | |
1655 | ||
1656 | /* We just reserve space for fragment header. | |
1657 | * Note: this may be overallocation if the message | |
1658 | * (without MSG_MORE) fits into the MTU. | |
1659 | */ | |
1660 | alloc_extra += sizeof(struct frag_hdr); | |
1661 | ||
1da177e4 | 1662 | if ((flags & MSG_MORE) && |
d8d1f30b | 1663 | !(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4 | 1664 | alloclen = mtu; |
6d123b81 JK |
1665 | else if (!paged && |
1666 | (fraglen + alloc_extra < SKB_MAX_ALLOC || | |
1667 | !(rt->dst.dev->features & NETIF_F_SG))) | |
15e36f5b | 1668 | alloclen = fraglen; |
47cf8899 | 1669 | else { |
773ba4fe PB |
1670 | alloclen = fragheaderlen + transhdrlen; |
1671 | pagedlen = datalen - transhdrlen; | |
15e36f5b | 1672 | } |
6d123b81 | 1673 | alloclen += alloc_extra; |
299b0767 | 1674 | |
0c183379 G |
1675 | if (datalen != length + fraggap) { |
1676 | /* | |
1677 | * this is not the last fragment, the trailer | |
1678 | * space is regarded as data space. | |
1679 | */ | |
1680 | datalen += rt->dst.trailer_len; | |
1681 | } | |
1682 | ||
0c183379 | 1683 | fraglen = datalen + fragheaderlen; |
1da177e4 | 1684 | |
15e36f5b | 1685 | copy = datalen - transhdrlen - fraggap - pagedlen; |
232cd35d ED |
1686 | if (copy < 0) { |
1687 | err = -EINVAL; | |
1688 | goto error; | |
1689 | } | |
1da177e4 | 1690 | if (transhdrlen) { |
6d123b81 | 1691 | skb = sock_alloc_send_skb(sk, alloclen, |
1da177e4 LT |
1692 | (flags & MSG_DONTWAIT), &err); |
1693 | } else { | |
1694 | skb = NULL; | |
1f4c6eb2 | 1695 | if (refcount_read(&sk->sk_wmem_alloc) + wmem_alloc_delta <= |
1da177e4 | 1696 | 2 * sk->sk_sndbuf) |
6d123b81 | 1697 | skb = alloc_skb(alloclen, |
1f4c6eb2 | 1698 | sk->sk_allocation); |
63159f29 | 1699 | if (unlikely(!skb)) |
1da177e4 LT |
1700 | err = -ENOBUFS; |
1701 | } | |
63159f29 | 1702 | if (!skb) |
1da177e4 LT |
1703 | goto error; |
1704 | /* | |
1705 | * Fill in the control structures | |
1706 | */ | |
9c9c9ad5 | 1707 | skb->protocol = htons(ETH_P_IPV6); |
32dce968 | 1708 | skb->ip_summed = csummode; |
1da177e4 | 1709 | skb->csum = 0; |
1f85851e G |
1710 | /* reserve for fragmentation and ipsec header */ |
1711 | skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + | |
1712 | dst_exthdrlen); | |
1da177e4 LT |
1713 | |
1714 | /* | |
1715 | * Find where to start putting bytes | |
1716 | */ | |
15e36f5b | 1717 | data = skb_put(skb, fraglen - pagedlen); |
1f85851e G |
1718 | skb_set_network_header(skb, exthdrlen); |
1719 | data += fragheaderlen; | |
b0e380b1 ACM |
1720 | skb->transport_header = (skb->network_header + |
1721 | fragheaderlen); | |
1da177e4 LT |
1722 | if (fraggap) { |
1723 | skb->csum = skb_copy_and_csum_bits( | |
1724 | skb_prev, maxfraglen, | |
8d5930df | 1725 | data + transhdrlen, fraggap); |
1da177e4 LT |
1726 | skb_prev->csum = csum_sub(skb_prev->csum, |
1727 | skb->csum); | |
1728 | data += fraggap; | |
e9fa4f7b | 1729 | pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4 | 1730 | } |
232cd35d ED |
1731 | if (copy > 0 && |
1732 | getfrag(from, data + transhdrlen, offset, | |
1733 | copy, fraggap, skb) < 0) { | |
1da177e4 LT |
1734 | err = -EFAULT; |
1735 | kfree_skb(skb); | |
1736 | goto error; | |
1737 | } | |
1738 | ||
1739 | offset += copy; | |
15e36f5b | 1740 | length -= copy + transhdrlen; |
1da177e4 LT |
1741 | transhdrlen = 0; |
1742 | exthdrlen = 0; | |
299b0767 | 1743 | dst_exthdrlen = 0; |
1da177e4 | 1744 | |
52900d22 WB |
1745 | /* Only the initial fragment is time stamped */ |
1746 | skb_shinfo(skb)->tx_flags = cork->tx_flags; | |
1747 | cork->tx_flags = 0; | |
1748 | skb_shinfo(skb)->tskey = tskey; | |
1749 | tskey = 0; | |
1750 | skb_zcopy_set(skb, uarg, &extra_uref); | |
1751 | ||
0dec879f JA |
1752 | if ((flags & MSG_CONFIRM) && !skb_prev) |
1753 | skb_set_dst_pending_confirm(skb, 1); | |
1754 | ||
1da177e4 LT |
1755 | /* |
1756 | * Put the packet on the pending queue | |
1757 | */ | |
1f4c6eb2 ED |
1758 | if (!skb->destructor) { |
1759 | skb->destructor = sock_wfree; | |
1760 | skb->sk = sk; | |
1761 | wmem_alloc_delta += skb->truesize; | |
1762 | } | |
0bbe84a6 | 1763 | __skb_queue_tail(queue, skb); |
1da177e4 LT |
1764 | continue; |
1765 | } | |
1766 | ||
1767 | if (copy > length) | |
1768 | copy = length; | |
1769 | ||
113f99c3 WB |
1770 | if (!(rt->dst.dev->features&NETIF_F_SG) && |
1771 | skb_tailroom(skb) >= copy) { | |
1da177e4 LT |
1772 | unsigned int off; |
1773 | ||
1774 | off = skb->len; | |
1775 | if (getfrag(from, skb_put(skb, copy), | |
1776 | offset, copy, off, skb) < 0) { | |
1777 | __skb_trim(skb, off); | |
1778 | err = -EFAULT; | |
1779 | goto error; | |
1780 | } | |
1fd3ae8c | 1781 | } else if (!zc) { |
1da177e4 | 1782 | int i = skb_shinfo(skb)->nr_frags; |
1da177e4 | 1783 | |
5640f768 ED |
1784 | err = -ENOMEM; |
1785 | if (!sk_page_frag_refill(sk, pfrag)) | |
1da177e4 | 1786 | goto error; |
5640f768 | 1787 | |
1fd3ae8c | 1788 | skb_zcopy_downgrade_managed(skb); |
5640f768 ED |
1789 | if (!skb_can_coalesce(skb, i, pfrag->page, |
1790 | pfrag->offset)) { | |
1791 | err = -EMSGSIZE; | |
1792 | if (i == MAX_SKB_FRAGS) | |
1793 | goto error; | |
1794 | ||
1795 | __skb_fill_page_desc(skb, i, pfrag->page, | |
1796 | pfrag->offset, 0); | |
1797 | skb_shinfo(skb)->nr_frags = ++i; | |
1798 | get_page(pfrag->page); | |
1da177e4 | 1799 | } |
5640f768 | 1800 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
9e903e08 | 1801 | if (getfrag(from, |
5640f768 ED |
1802 | page_address(pfrag->page) + pfrag->offset, |
1803 | offset, copy, skb->len, skb) < 0) | |
1804 | goto error_efault; | |
1805 | ||
1806 | pfrag->offset += copy; | |
1807 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1da177e4 LT |
1808 | skb->len += copy; |
1809 | skb->data_len += copy; | |
f945fa7a | 1810 | skb->truesize += copy; |
1f4c6eb2 | 1811 | wmem_alloc_delta += copy; |
b5947e5d WB |
1812 | } else { |
1813 | err = skb_zerocopy_iter_dgram(skb, from, copy); | |
1814 | if (err < 0) | |
1815 | goto error; | |
1da177e4 LT |
1816 | } |
1817 | offset += copy; | |
1818 | length -= copy; | |
1819 | } | |
5640f768 | 1820 | |
9e8445a5 PA |
1821 | if (wmem_alloc_delta) |
1822 | refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc); | |
1da177e4 | 1823 | return 0; |
5640f768 ED |
1824 | |
1825 | error_efault: | |
1826 | err = -EFAULT; | |
1da177e4 | 1827 | error: |
8e044917 | 1828 | net_zcopy_put_abort(uarg, extra_uref); |
bdc712b4 | 1829 | cork->length -= length; |
3bd653c8 | 1830 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
1f4c6eb2 | 1831 | refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc); |
1da177e4 LT |
1832 | return err; |
1833 | } | |
0bbe84a6 VY |
1834 | |
1835 | int ip6_append_data(struct sock *sk, | |
1836 | int getfrag(void *from, char *to, int offset, int len, | |
1837 | int odd, struct sk_buff *skb), | |
f93431c8 | 1838 | void *from, size_t length, int transhdrlen, |
26879da5 | 1839 | struct ipcm6_cookie *ipc6, struct flowi6 *fl6, |
5fdaa88d | 1840 | struct rt6_info *rt, unsigned int flags) |
0bbe84a6 VY |
1841 | { |
1842 | struct inet_sock *inet = inet_sk(sk); | |
1843 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1844 | int exthdrlen; | |
1845 | int err; | |
1846 | ||
1847 | if (flags&MSG_PROBE) | |
1848 | return 0; | |
1849 | if (skb_queue_empty(&sk->sk_write_queue)) { | |
1850 | /* | |
1851 | * setup for corking | |
1852 | */ | |
40ac240c | 1853 | dst_hold(&rt->dst); |
26879da5 | 1854 | err = ip6_setup_cork(sk, &inet->cork, &np->cork, |
f37a4cc6 | 1855 | ipc6, rt); |
0bbe84a6 VY |
1856 | if (err) |
1857 | return err; | |
1858 | ||
f37a4cc6 | 1859 | inet->cork.fl.u.ip6 = *fl6; |
26879da5 | 1860 | exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0); |
0bbe84a6 VY |
1861 | length += exthdrlen; |
1862 | transhdrlen += exthdrlen; | |
1863 | } else { | |
0bbe84a6 VY |
1864 | transhdrlen = 0; |
1865 | } | |
1866 | ||
f37a4cc6 | 1867 | return __ip6_append_data(sk, &sk->sk_write_queue, &inet->cork, |
0bbe84a6 | 1868 | &np->cork, sk_page_frag(sk), getfrag, |
5fdaa88d | 1869 | from, length, transhdrlen, flags, ipc6); |
0bbe84a6 | 1870 | } |
a495f836 | 1871 | EXPORT_SYMBOL_GPL(ip6_append_data); |
1da177e4 | 1872 | |
cd3c7480 PB |
1873 | static void ip6_cork_steal_dst(struct sk_buff *skb, struct inet_cork_full *cork) |
1874 | { | |
1875 | struct dst_entry *dst = cork->base.dst; | |
1876 | ||
1877 | cork->base.dst = NULL; | |
1878 | cork->base.flags &= ~IPCORK_ALLFRAG; | |
1879 | skb_dst_set(skb, dst); | |
1880 | } | |
1881 | ||
366e41d9 VY |
1882 | static void ip6_cork_release(struct inet_cork_full *cork, |
1883 | struct inet6_cork *v6_cork) | |
bf138862 | 1884 | { |
366e41d9 | 1885 | if (v6_cork->opt) { |
d656b2ea PB |
1886 | struct ipv6_txoptions *opt = v6_cork->opt; |
1887 | ||
1888 | kfree(opt->dst0opt); | |
1889 | kfree(opt->dst1opt); | |
1890 | kfree(opt->hopopt); | |
1891 | kfree(opt->srcrt); | |
1892 | kfree(opt); | |
366e41d9 | 1893 | v6_cork->opt = NULL; |
0178b695 HX |
1894 | } |
1895 | ||
366e41d9 VY |
1896 | if (cork->base.dst) { |
1897 | dst_release(cork->base.dst); | |
1898 | cork->base.dst = NULL; | |
1899 | cork->base.flags &= ~IPCORK_ALLFRAG; | |
bf138862 | 1900 | } |
bf138862 PE |
1901 | } |
1902 | ||
6422398c VY |
1903 | struct sk_buff *__ip6_make_skb(struct sock *sk, |
1904 | struct sk_buff_head *queue, | |
1905 | struct inet_cork_full *cork, | |
1906 | struct inet6_cork *v6_cork) | |
1da177e4 LT |
1907 | { |
1908 | struct sk_buff *skb, *tmp_skb; | |
1909 | struct sk_buff **tail_skb; | |
b60d4e58 | 1910 | struct in6_addr *final_dst; |
1da177e4 | 1911 | struct ipv6_pinfo *np = inet6_sk(sk); |
3bd653c8 | 1912 | struct net *net = sock_net(sk); |
1da177e4 | 1913 | struct ipv6hdr *hdr; |
6422398c VY |
1914 | struct ipv6_txoptions *opt = v6_cork->opt; |
1915 | struct rt6_info *rt = (struct rt6_info *)cork->base.dst; | |
1916 | struct flowi6 *fl6 = &cork->fl.u.ip6; | |
4c9483b2 | 1917 | unsigned char proto = fl6->flowi6_proto; |
1da177e4 | 1918 | |
6422398c | 1919 | skb = __skb_dequeue(queue); |
63159f29 | 1920 | if (!skb) |
1da177e4 LT |
1921 | goto out; |
1922 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1923 | ||
1924 | /* move skb->data to ip header from ext header */ | |
d56f90a7 | 1925 | if (skb->data < skb_network_header(skb)) |
bbe735e4 | 1926 | __skb_pull(skb, skb_network_offset(skb)); |
6422398c | 1927 | while ((tmp_skb = __skb_dequeue(queue)) != NULL) { |
cfe1fc77 | 1928 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4 LT |
1929 | *tail_skb = tmp_skb; |
1930 | tail_skb = &(tmp_skb->next); | |
1931 | skb->len += tmp_skb->len; | |
1932 | skb->data_len += tmp_skb->len; | |
1da177e4 | 1933 | skb->truesize += tmp_skb->truesize; |
1da177e4 LT |
1934 | tmp_skb->destructor = NULL; |
1935 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1936 | } |
1937 | ||
28a89453 | 1938 | /* Allow local fragmentation. */ |
60ff7467 | 1939 | skb->ignore_df = ip6_sk_ignore_df(sk); |
cfe1fc77 | 1940 | __skb_pull(skb, skb_network_header_len(skb)); |
b60d4e58 PB |
1941 | |
1942 | final_dst = &fl6->daddr; | |
1da177e4 LT |
1943 | if (opt && opt->opt_flen) |
1944 | ipv6_push_frag_opts(skb, opt, &proto); | |
1945 | if (opt && opt->opt_nflen) | |
613fa3ca | 1946 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst, &fl6->saddr); |
1da177e4 | 1947 | |
e2d1bca7 ACM |
1948 | skb_push(skb, sizeof(struct ipv6hdr)); |
1949 | skb_reset_network_header(skb); | |
0660e03f | 1950 | hdr = ipv6_hdr(skb); |
1ab1457c | 1951 | |
6422398c | 1952 | ip6_flow_hdr(hdr, v6_cork->tclass, |
cb1ce2ef | 1953 | ip6_make_flowlabel(net, skb, fl6->flowlabel, |
513674b5 | 1954 | ip6_autoflowlabel(net, np), fl6)); |
6422398c | 1955 | hdr->hop_limit = v6_cork->hop_limit; |
1da177e4 | 1956 | hdr->nexthdr = proto; |
4e3fd7a0 AD |
1957 | hdr->saddr = fl6->saddr; |
1958 | hdr->daddr = *final_dst; | |
1da177e4 | 1959 | |
a2c2064f | 1960 | skb->priority = sk->sk_priority; |
c6af0c22 | 1961 | skb->mark = cork->base.mark; |
a818f75e JSP |
1962 | skb->tstamp = cork->base.transmit_time; |
1963 | ||
cd3c7480 | 1964 | ip6_cork_steal_dst(skb, cork); |
edf391ff | 1965 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
14878f75 | 1966 | if (proto == IPPROTO_ICMPV6) { |
adf30907 | 1967 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
14878f75 | 1968 | |
43a43b60 HFS |
1969 | ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type); |
1970 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); | |
14878f75 DS |
1971 | } |
1972 | ||
6422398c VY |
1973 | ip6_cork_release(cork, v6_cork); |
1974 | out: | |
1975 | return skb; | |
1976 | } | |
1977 | ||
1978 | int ip6_send_skb(struct sk_buff *skb) | |
1979 | { | |
1980 | struct net *net = sock_net(skb->sk); | |
1981 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); | |
1982 | int err; | |
1983 | ||
33224b16 | 1984 | err = ip6_local_out(net, skb->sk, skb); |
1da177e4 LT |
1985 | if (err) { |
1986 | if (err > 0) | |
6ce9e7b5 | 1987 | err = net_xmit_errno(err); |
1da177e4 | 1988 | if (err) |
6422398c VY |
1989 | IP6_INC_STATS(net, rt->rt6i_idev, |
1990 | IPSTATS_MIB_OUTDISCARDS); | |
1da177e4 LT |
1991 | } |
1992 | ||
1da177e4 | 1993 | return err; |
6422398c VY |
1994 | } |
1995 | ||
1996 | int ip6_push_pending_frames(struct sock *sk) | |
1997 | { | |
1998 | struct sk_buff *skb; | |
1999 | ||
2000 | skb = ip6_finish_skb(sk); | |
2001 | if (!skb) | |
2002 | return 0; | |
2003 | ||
2004 | return ip6_send_skb(skb); | |
1da177e4 | 2005 | } |
a495f836 | 2006 | EXPORT_SYMBOL_GPL(ip6_push_pending_frames); |
1da177e4 | 2007 | |
0bbe84a6 | 2008 | static void __ip6_flush_pending_frames(struct sock *sk, |
6422398c VY |
2009 | struct sk_buff_head *queue, |
2010 | struct inet_cork_full *cork, | |
2011 | struct inet6_cork *v6_cork) | |
1da177e4 | 2012 | { |
1da177e4 LT |
2013 | struct sk_buff *skb; |
2014 | ||
0bbe84a6 | 2015 | while ((skb = __skb_dequeue_tail(queue)) != NULL) { |
adf30907 ED |
2016 | if (skb_dst(skb)) |
2017 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
e1f52208 | 2018 | IPSTATS_MIB_OUTDISCARDS); |
1da177e4 LT |
2019 | kfree_skb(skb); |
2020 | } | |
2021 | ||
6422398c | 2022 | ip6_cork_release(cork, v6_cork); |
1da177e4 | 2023 | } |
0bbe84a6 VY |
2024 | |
2025 | void ip6_flush_pending_frames(struct sock *sk) | |
2026 | { | |
6422398c VY |
2027 | __ip6_flush_pending_frames(sk, &sk->sk_write_queue, |
2028 | &inet_sk(sk)->cork, &inet6_sk(sk)->cork); | |
0bbe84a6 | 2029 | } |
a495f836 | 2030 | EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); |
6422398c VY |
2031 | |
2032 | struct sk_buff *ip6_make_skb(struct sock *sk, | |
2033 | int getfrag(void *from, char *to, int offset, | |
2034 | int len, int odd, struct sk_buff *skb), | |
f93431c8 | 2035 | void *from, size_t length, int transhdrlen, |
f37a4cc6 PB |
2036 | struct ipcm6_cookie *ipc6, struct rt6_info *rt, |
2037 | unsigned int flags, struct inet_cork_full *cork) | |
6422398c | 2038 | { |
6422398c VY |
2039 | struct inet6_cork v6_cork; |
2040 | struct sk_buff_head queue; | |
26879da5 | 2041 | int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0); |
6422398c VY |
2042 | int err; |
2043 | ||
40ac240c PB |
2044 | if (flags & MSG_PROBE) { |
2045 | dst_release(&rt->dst); | |
6422398c | 2046 | return NULL; |
40ac240c | 2047 | } |
6422398c VY |
2048 | |
2049 | __skb_queue_head_init(&queue); | |
2050 | ||
1cd7884d WB |
2051 | cork->base.flags = 0; |
2052 | cork->base.addr = 0; | |
2053 | cork->base.opt = NULL; | |
6422398c | 2054 | v6_cork.opt = NULL; |
f37a4cc6 | 2055 | err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt); |
862c03ee | 2056 | if (err) { |
1cd7884d | 2057 | ip6_cork_release(cork, &v6_cork); |
6422398c | 2058 | return ERR_PTR(err); |
862c03ee | 2059 | } |
26879da5 WW |
2060 | if (ipc6->dontfrag < 0) |
2061 | ipc6->dontfrag = inet6_sk(sk)->dontfrag; | |
6422398c | 2062 | |
f37a4cc6 | 2063 | err = __ip6_append_data(sk, &queue, cork, &v6_cork, |
6422398c VY |
2064 | ¤t->task_frag, getfrag, from, |
2065 | length + exthdrlen, transhdrlen + exthdrlen, | |
5fdaa88d | 2066 | flags, ipc6); |
6422398c | 2067 | if (err) { |
1cd7884d | 2068 | __ip6_flush_pending_frames(sk, &queue, cork, &v6_cork); |
6422398c VY |
2069 | return ERR_PTR(err); |
2070 | } | |
2071 | ||
1cd7884d | 2072 | return __ip6_make_skb(sk, &queue, cork, &v6_cork); |
6422398c | 2073 | } |