Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * common UDP/RAW code | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #include <linux/errno.h> |
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
1da177e4 LT |
18 | #include <linux/interrupt.h> |
19 | #include <linux/socket.h> | |
20 | #include <linux/sockios.h> | |
21 | #include <linux/in6.h> | |
22 | #include <linux/ipv6.h> | |
23 | #include <linux/route.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
a495f836 | 25 | #include <linux/export.h> |
1da177e4 LT |
26 | |
27 | #include <net/ipv6.h> | |
28 | #include <net/ndisc.h> | |
29 | #include <net/addrconf.h> | |
30 | #include <net/transp_v6.h> | |
31 | #include <net/ip6_route.h> | |
c752f073 | 32 | #include <net/tcp_states.h> |
e7219858 | 33 | #include <net/dsfield.h> |
1da177e4 LT |
34 | |
35 | #include <linux/errqueue.h> | |
36 | #include <asm/uaccess.h> | |
37 | ||
a50feda5 | 38 | static bool ipv6_mapped_addr_any(const struct in6_addr *a) |
c15fea2d | 39 | { |
a50feda5 | 40 | return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); |
c15fea2d MM |
41 | } |
42 | ||
1da177e4 LT |
43 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
44 | { | |
45 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
67ba4152 IM |
46 | struct inet_sock *inet = inet_sk(sk); |
47 | struct ipv6_pinfo *np = inet6_sk(sk); | |
48 | struct in6_addr *daddr, *final_p, final; | |
1da177e4 | 49 | struct dst_entry *dst; |
4c9483b2 | 50 | struct flowi6 fl6; |
1da177e4 | 51 | struct ip6_flowlabel *flowlabel = NULL; |
67ba4152 | 52 | struct ipv6_txoptions *opt; |
1da177e4 LT |
53 | int addr_type; |
54 | int err; | |
55 | ||
56 | if (usin->sin6_family == AF_INET) { | |
57 | if (__ipv6_only_sock(sk)) | |
58 | return -EAFNOSUPPORT; | |
59 | err = ip4_datagram_connect(sk, uaddr, addr_len); | |
60 | goto ipv4_connected; | |
61 | } | |
62 | ||
63 | if (addr_len < SIN6_LEN_RFC2133) | |
1ab1457c | 64 | return -EINVAL; |
1da177e4 | 65 | |
1ab1457c YH |
66 | if (usin->sin6_family != AF_INET6) |
67 | return -EAFNOSUPPORT; | |
1da177e4 | 68 | |
4c9483b2 | 69 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 70 | if (np->sndflow) { |
4c9483b2 DM |
71 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
72 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
73 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
1da177e4 LT |
74 | if (flowlabel == NULL) |
75 | return -EINVAL; | |
1da177e4 LT |
76 | } |
77 | } | |
78 | ||
79 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
80 | ||
81 | if (addr_type == IPV6_ADDR_ANY) { | |
82 | /* | |
83 | * connect to self | |
84 | */ | |
85 | usin->sin6_addr.s6_addr[15] = 0x01; | |
86 | } | |
87 | ||
88 | daddr = &usin->sin6_addr; | |
89 | ||
90 | if (addr_type == IPV6_ADDR_MAPPED) { | |
91 | struct sockaddr_in sin; | |
92 | ||
93 | if (__ipv6_only_sock(sk)) { | |
94 | err = -ENETUNREACH; | |
95 | goto out; | |
96 | } | |
97 | sin.sin_family = AF_INET; | |
98 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; | |
99 | sin.sin_port = usin->sin6_port; | |
100 | ||
1ab1457c | 101 | err = ip4_datagram_connect(sk, |
b5a4257c | 102 | (struct sockaddr *) &sin, |
1da177e4 LT |
103 | sizeof(sin)); |
104 | ||
105 | ipv4_connected: | |
106 | if (err) | |
107 | goto out; | |
1ab1457c | 108 | |
efe4208f | 109 | ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); |
1da177e4 | 110 | |
c15fea2d MM |
111 | if (ipv6_addr_any(&np->saddr) || |
112 | ipv6_mapped_addr_any(&np->saddr)) | |
c720c7e8 | 113 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
b301e82c | 114 | |
efe4208f ED |
115 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || |
116 | ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { | |
c720c7e8 | 117 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
efe4208f | 118 | &sk->sk_v6_rcv_saddr); |
719f8358 ED |
119 | if (sk->sk_prot->rehash) |
120 | sk->sk_prot->rehash(sk); | |
121 | } | |
1da177e4 | 122 | |
1da177e4 LT |
123 | goto out; |
124 | } | |
125 | ||
842df073 | 126 | if (__ipv6_addr_needs_scope_id(addr_type)) { |
1da177e4 LT |
127 | if (addr_len >= sizeof(struct sockaddr_in6) && |
128 | usin->sin6_scope_id) { | |
129 | if (sk->sk_bound_dev_if && | |
130 | sk->sk_bound_dev_if != usin->sin6_scope_id) { | |
131 | err = -EINVAL; | |
132 | goto out; | |
133 | } | |
134 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
1da177e4 LT |
135 | } |
136 | ||
1ac4f008 BH |
137 | if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) |
138 | sk->sk_bound_dev_if = np->mcast_oif; | |
139 | ||
1da177e4 LT |
140 | /* Connect to link-local address requires an interface */ |
141 | if (!sk->sk_bound_dev_if) { | |
142 | err = -EINVAL; | |
143 | goto out; | |
144 | } | |
145 | } | |
146 | ||
efe4208f | 147 | sk->sk_v6_daddr = *daddr; |
4c9483b2 | 148 | np->flow_label = fl6.flowlabel; |
1da177e4 | 149 | |
c720c7e8 | 150 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
151 | |
152 | /* | |
153 | * Check for a route to destination an obtain the | |
154 | * destination cache for it. | |
155 | */ | |
156 | ||
4c9483b2 | 157 | fl6.flowi6_proto = sk->sk_protocol; |
efe4208f | 158 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 159 | fl6.saddr = np->saddr; |
4c9483b2 DM |
160 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
161 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
162 | fl6.fl6_dport = inet->inet_dport; |
163 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 164 | |
4c9483b2 DM |
165 | if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) |
166 | fl6.flowi6_oif = np->mcast_oif; | |
1da177e4 | 167 | |
4c9483b2 | 168 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 169 | |
20c59de2 | 170 | opt = flowlabel ? flowlabel->opt : np->opt; |
4c9483b2 | 171 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 172 | |
0e0d44ab | 173 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
174 | err = 0; |
175 | if (IS_ERR(dst)) { | |
176 | err = PTR_ERR(dst); | |
1da177e4 | 177 | goto out; |
14e50e57 | 178 | } |
1da177e4 LT |
179 | |
180 | /* source address lookup done in ip6_dst_lookup */ | |
181 | ||
182 | if (ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 183 | np->saddr = fl6.saddr; |
1da177e4 | 184 | |
efe4208f ED |
185 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
186 | sk->sk_v6_rcv_saddr = fl6.saddr; | |
c720c7e8 | 187 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
719f8358 ED |
188 | if (sk->sk_prot->rehash) |
189 | sk->sk_prot->rehash(sk); | |
1da177e4 LT |
190 | } |
191 | ||
192 | ip6_dst_store(sk, dst, | |
efe4208f ED |
193 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
194 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 195 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 196 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
197 | &np->saddr : |
198 | #endif | |
199 | NULL); | |
1da177e4 LT |
200 | |
201 | sk->sk_state = TCP_ESTABLISHED; | |
b73c3d0e | 202 | ip6_set_txhash(sk); |
1da177e4 LT |
203 | out: |
204 | fl6_sock_release(flowlabel); | |
205 | return err; | |
206 | } | |
a495f836 | 207 | EXPORT_SYMBOL_GPL(ip6_datagram_connect); |
1da177e4 | 208 | |
82b276cd HFS |
209 | int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, |
210 | int addr_len) | |
211 | { | |
212 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); | |
213 | if (sin6->sin6_family != AF_INET6) | |
214 | return -EAFNOSUPPORT; | |
215 | return ip6_datagram_connect(sk, uaddr, addr_len); | |
216 | } | |
217 | EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); | |
218 | ||
1ab1457c | 219 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
e69a4adc | 220 | __be16 port, u32 info, u8 *payload) |
1da177e4 LT |
221 | { |
222 | struct ipv6_pinfo *np = inet6_sk(sk); | |
cc70ab26 | 223 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 LT |
224 | struct sock_exterr_skb *serr; |
225 | ||
226 | if (!np->recverr) | |
227 | return; | |
228 | ||
229 | skb = skb_clone(skb, GFP_ATOMIC); | |
230 | if (!skb) | |
231 | return; | |
232 | ||
d40a4de0 BH |
233 | skb->protocol = htons(ETH_P_IPV6); |
234 | ||
1da177e4 LT |
235 | serr = SKB_EXT_ERR(skb); |
236 | serr->ee.ee_errno = err; | |
237 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; | |
1ab1457c | 238 | serr->ee.ee_type = icmph->icmp6_type; |
1da177e4 LT |
239 | serr->ee.ee_code = icmph->icmp6_code; |
240 | serr->ee.ee_pad = 0; | |
241 | serr->ee.ee_info = info; | |
242 | serr->ee.ee_data = 0; | |
d56f90a7 ACM |
243 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
244 | skb_network_header(skb); | |
1da177e4 LT |
245 | serr->port = port; |
246 | ||
1da177e4 | 247 | __skb_pull(skb, payload - skb->data); |
bd82393c | 248 | skb_reset_transport_header(skb); |
1da177e4 LT |
249 | |
250 | if (sock_queue_err_skb(sk, skb)) | |
251 | kfree_skb(skb); | |
252 | } | |
253 | ||
4c9483b2 | 254 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
1da177e4 LT |
255 | { |
256 | struct ipv6_pinfo *np = inet6_sk(sk); | |
257 | struct sock_exterr_skb *serr; | |
258 | struct ipv6hdr *iph; | |
259 | struct sk_buff *skb; | |
260 | ||
261 | if (!np->recverr) | |
262 | return; | |
263 | ||
264 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
265 | if (!skb) | |
266 | return; | |
267 | ||
d40a4de0 BH |
268 | skb->protocol = htons(ETH_P_IPV6); |
269 | ||
1ced98e8 ACM |
270 | skb_put(skb, sizeof(struct ipv6hdr)); |
271 | skb_reset_network_header(skb); | |
0660e03f | 272 | iph = ipv6_hdr(skb); |
4e3fd7a0 | 273 | iph->daddr = fl6->daddr; |
1da177e4 LT |
274 | |
275 | serr = SKB_EXT_ERR(skb); | |
276 | serr->ee.ee_errno = err; | |
277 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
1ab1457c | 278 | serr->ee.ee_type = 0; |
1da177e4 LT |
279 | serr->ee.ee_code = 0; |
280 | serr->ee.ee_pad = 0; | |
281 | serr->ee.ee_info = info; | |
282 | serr->ee.ee_data = 0; | |
d56f90a7 | 283 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1958b856 | 284 | serr->port = fl6->fl6_dport; |
1da177e4 | 285 | |
27a884dc | 286 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 287 | skb_reset_transport_header(skb); |
1da177e4 LT |
288 | |
289 | if (sock_queue_err_skb(sk, skb)) | |
290 | kfree_skb(skb); | |
291 | } | |
292 | ||
4c9483b2 | 293 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
4b340ae2 BH |
294 | { |
295 | struct ipv6_pinfo *np = inet6_sk(sk); | |
296 | struct ipv6hdr *iph; | |
297 | struct sk_buff *skb; | |
298 | struct ip6_mtuinfo *mtu_info; | |
299 | ||
300 | if (!np->rxopt.bits.rxpmtu) | |
301 | return; | |
302 | ||
303 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
304 | if (!skb) | |
305 | return; | |
306 | ||
307 | skb_put(skb, sizeof(struct ipv6hdr)); | |
308 | skb_reset_network_header(skb); | |
309 | iph = ipv6_hdr(skb); | |
4e3fd7a0 | 310 | iph->daddr = fl6->daddr; |
4b340ae2 BH |
311 | |
312 | mtu_info = IP6CBMTU(skb); | |
4b340ae2 BH |
313 | |
314 | mtu_info->ip6m_mtu = mtu; | |
315 | mtu_info->ip6m_addr.sin6_family = AF_INET6; | |
316 | mtu_info->ip6m_addr.sin6_port = 0; | |
317 | mtu_info->ip6m_addr.sin6_flowinfo = 0; | |
4c9483b2 | 318 | mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
4e3fd7a0 | 319 | mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; |
4b340ae2 BH |
320 | |
321 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); | |
322 | skb_reset_transport_header(skb); | |
323 | ||
324 | skb = xchg(&np->rxpmtu, skb); | |
325 | kfree_skb(skb); | |
326 | } | |
327 | ||
1ab1457c | 328 | /* |
1da177e4 LT |
329 | * Handle MSG_ERRQUEUE |
330 | */ | |
85fbaa75 | 331 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
332 | { |
333 | struct ipv6_pinfo *np = inet6_sk(sk); | |
334 | struct sock_exterr_skb *serr; | |
364a9e93 | 335 | struct sk_buff *skb; |
342dfc30 | 336 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
1da177e4 LT |
337 | struct { |
338 | struct sock_extended_err ee; | |
339 | struct sockaddr_in6 offender; | |
340 | } errhdr; | |
341 | int err; | |
342 | int copied; | |
343 | ||
344 | err = -EAGAIN; | |
364a9e93 | 345 | skb = sock_dequeue_err_skb(sk); |
1da177e4 LT |
346 | if (skb == NULL) |
347 | goto out; | |
348 | ||
349 | copied = skb->len; | |
350 | if (copied > len) { | |
351 | msg->msg_flags |= MSG_TRUNC; | |
352 | copied = len; | |
353 | } | |
354 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
355 | if (err) | |
356 | goto out_free_skb; | |
357 | ||
358 | sock_recv_timestamp(msg, sk, skb); | |
359 | ||
360 | serr = SKB_EXT_ERR(skb); | |
361 | ||
1da177e4 | 362 | if (sin) { |
d56f90a7 | 363 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
364 | sin->sin6_family = AF_INET6; |
365 | sin->sin6_flowinfo = 0; | |
1ab1457c | 366 | sin->sin6_port = serr->port; |
d40a4de0 | 367 | if (skb->protocol == htons(ETH_P_IPV6)) { |
6c40d100 YH |
368 | const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), |
369 | struct ipv6hdr, daddr); | |
370 | sin->sin6_addr = ip6h->daddr; | |
1da177e4 | 371 | if (np->sndflow) |
6502ca52 | 372 | sin->sin6_flowinfo = ip6_flowinfo(ip6h); |
842df073 HFS |
373 | sin->sin6_scope_id = |
374 | ipv6_iface_scope_id(&sin->sin6_addr, | |
375 | IP6CB(skb)->iif); | |
1da177e4 | 376 | } else { |
b301e82c BH |
377 | ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
378 | &sin->sin6_addr); | |
842df073 | 379 | sin->sin6_scope_id = 0; |
1da177e4 | 380 | } |
85fbaa75 | 381 | *addr_len = sizeof(*sin); |
1da177e4 LT |
382 | } |
383 | ||
384 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
385 | sin = &errhdr.offender; | |
386 | sin->sin6_family = AF_UNSPEC; | |
387 | if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { | |
388 | sin->sin6_family = AF_INET6; | |
389 | sin->sin6_flowinfo = 0; | |
1fa4c710 | 390 | sin->sin6_port = 0; |
4b261c75 HFS |
391 | if (np->rxopt.all) |
392 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
d40a4de0 | 393 | if (skb->protocol == htons(ETH_P_IPV6)) { |
4e3fd7a0 | 394 | sin->sin6_addr = ipv6_hdr(skb)->saddr; |
1da177e4 | 395 | if (np->rxopt.all) |
4b261c75 | 396 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
842df073 HFS |
397 | sin->sin6_scope_id = |
398 | ipv6_iface_scope_id(&sin->sin6_addr, | |
399 | IP6CB(skb)->iif); | |
1da177e4 LT |
400 | } else { |
401 | struct inet_sock *inet = inet_sk(sk); | |
402 | ||
b301e82c BH |
403 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
404 | &sin->sin6_addr); | |
842df073 | 405 | sin->sin6_scope_id = 0; |
1da177e4 LT |
406 | if (inet->cmsg_flags) |
407 | ip_cmsg_recv(msg, skb); | |
408 | } | |
409 | } | |
410 | ||
411 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); | |
412 | ||
413 | /* Now we could try to dump offended packet options */ | |
414 | ||
415 | msg->msg_flags |= MSG_ERRQUEUE; | |
416 | err = copied; | |
417 | ||
1ab1457c | 418 | out_free_skb: |
1da177e4 LT |
419 | kfree_skb(skb); |
420 | out: | |
421 | return err; | |
422 | } | |
a495f836 | 423 | EXPORT_SYMBOL_GPL(ipv6_recv_error); |
1da177e4 | 424 | |
4b340ae2 BH |
425 | /* |
426 | * Handle IPV6_RECVPATHMTU | |
427 | */ | |
85fbaa75 HFS |
428 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, |
429 | int *addr_len) | |
4b340ae2 BH |
430 | { |
431 | struct ipv6_pinfo *np = inet6_sk(sk); | |
432 | struct sk_buff *skb; | |
4b340ae2 | 433 | struct ip6_mtuinfo mtu_info; |
342dfc30 | 434 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
4b340ae2 BH |
435 | int err; |
436 | int copied; | |
437 | ||
438 | err = -EAGAIN; | |
439 | skb = xchg(&np->rxpmtu, NULL); | |
440 | if (skb == NULL) | |
441 | goto out; | |
442 | ||
443 | copied = skb->len; | |
444 | if (copied > len) { | |
445 | msg->msg_flags |= MSG_TRUNC; | |
446 | copied = len; | |
447 | } | |
448 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
449 | if (err) | |
450 | goto out_free_skb; | |
451 | ||
452 | sock_recv_timestamp(msg, sk, skb); | |
453 | ||
454 | memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); | |
455 | ||
4b340ae2 BH |
456 | if (sin) { |
457 | sin->sin6_family = AF_INET6; | |
458 | sin->sin6_flowinfo = 0; | |
459 | sin->sin6_port = 0; | |
460 | sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; | |
4e3fd7a0 | 461 | sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; |
85fbaa75 | 462 | *addr_len = sizeof(*sin); |
4b340ae2 BH |
463 | } |
464 | ||
465 | put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); | |
466 | ||
467 | err = copied; | |
468 | ||
469 | out_free_skb: | |
470 | kfree_skb(skb); | |
471 | out: | |
472 | return err; | |
473 | } | |
1da177e4 LT |
474 | |
475 | ||
4b261c75 HFS |
476 | void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, |
477 | struct sk_buff *skb) | |
1da177e4 LT |
478 | { |
479 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4b261c75 | 480 | bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); |
1da177e4 LT |
481 | |
482 | if (np->rxopt.bits.rxinfo) { | |
483 | struct in6_pktinfo src_info; | |
484 | ||
4b261c75 HFS |
485 | if (is_ipv6) { |
486 | src_info.ipi6_ifindex = IP6CB(skb)->iif; | |
487 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; | |
488 | } else { | |
489 | src_info.ipi6_ifindex = | |
490 | PKTINFO_SKB_CB(skb)->ipi_ifindex; | |
491 | ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, | |
492 | &src_info.ipi6_addr); | |
493 | } | |
1da177e4 LT |
494 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); |
495 | } | |
4b261c75 HFS |
496 | } |
497 | ||
498 | void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, | |
499 | struct sk_buff *skb) | |
500 | { | |
501 | struct ipv6_pinfo *np = inet6_sk(sk); | |
502 | struct inet6_skb_parm *opt = IP6CB(skb); | |
503 | unsigned char *nh = skb_network_header(skb); | |
1da177e4 LT |
504 | |
505 | if (np->rxopt.bits.rxhlim) { | |
0660e03f | 506 | int hlim = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
507 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
508 | } | |
509 | ||
41a1f8ea | 510 | if (np->rxopt.bits.rxtclass) { |
e7219858 | 511 | int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
41a1f8ea YH |
512 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
513 | } | |
514 | ||
6502ca52 YH |
515 | if (np->rxopt.bits.rxflow) { |
516 | __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); | |
517 | if (flowinfo) | |
518 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); | |
1da177e4 | 519 | } |
333fad53 YH |
520 | |
521 | /* HbH is allowed only once */ | |
1da177e4 | 522 | if (np->rxopt.bits.hopopts && opt->hop) { |
d56f90a7 | 523 | u8 *ptr = nh + opt->hop; |
1da177e4 LT |
524 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
525 | } | |
333fad53 YH |
526 | |
527 | if (opt->lastopt && | |
528 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { | |
529 | /* | |
530 | * Silly enough, but we need to reparse in order to | |
531 | * report extension headers (except for HbH) | |
532 | * in order. | |
533 | * | |
1ab1457c | 534 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
333fad53 YH |
535 | * (and WILL NOT be) defined because |
536 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji | |
537 | */ | |
538 | unsigned int off = sizeof(struct ipv6hdr); | |
0660e03f | 539 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
333fad53 YH |
540 | |
541 | while (off <= opt->lastopt) { | |
95c96174 | 542 | unsigned int len; |
d56f90a7 | 543 | u8 *ptr = nh + off; |
333fad53 | 544 | |
b5a4257c | 545 | switch (nexthdr) { |
333fad53 YH |
546 | case IPPROTO_DSTOPTS: |
547 | nexthdr = ptr[0]; | |
548 | len = (ptr[1] + 1) << 3; | |
549 | if (np->rxopt.bits.dstopts) | |
550 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); | |
551 | break; | |
552 | case IPPROTO_ROUTING: | |
553 | nexthdr = ptr[0]; | |
554 | len = (ptr[1] + 1) << 3; | |
555 | if (np->rxopt.bits.srcrt) | |
556 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); | |
557 | break; | |
558 | case IPPROTO_AH: | |
559 | nexthdr = ptr[0]; | |
a3059893 | 560 | len = (ptr[1] + 2) << 2; |
333fad53 YH |
561 | break; |
562 | default: | |
563 | nexthdr = ptr[0]; | |
564 | len = (ptr[1] + 1) << 3; | |
565 | break; | |
566 | } | |
567 | ||
568 | off += len; | |
569 | } | |
570 | } | |
571 | ||
572 | /* socket options in old style */ | |
573 | if (np->rxopt.bits.rxoinfo) { | |
574 | struct in6_pktinfo src_info; | |
575 | ||
576 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 577 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
333fad53 YH |
578 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
579 | } | |
580 | if (np->rxopt.bits.rxohlim) { | |
0660e03f | 581 | int hlim = ipv6_hdr(skb)->hop_limit; |
333fad53 YH |
582 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
583 | } | |
584 | if (np->rxopt.bits.ohopopts && opt->hop) { | |
d56f90a7 | 585 | u8 *ptr = nh + opt->hop; |
333fad53 YH |
586 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
587 | } | |
588 | if (np->rxopt.bits.odstopts && opt->dst0) { | |
d56f90a7 | 589 | u8 *ptr = nh + opt->dst0; |
333fad53 | 590 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 591 | } |
333fad53 | 592 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
d56f90a7 | 593 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
333fad53 | 594 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
1da177e4 | 595 | } |
333fad53 | 596 | if (np->rxopt.bits.odstopts && opt->dst1) { |
d56f90a7 | 597 | u8 *ptr = nh + opt->dst1; |
333fad53 | 598 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 599 | } |
6c468622 BS |
600 | if (np->rxopt.bits.rxorigdstaddr) { |
601 | struct sockaddr_in6 sin6; | |
747465ef | 602 | __be16 *ports = (__be16 *) skb_transport_header(skb); |
6c468622 BS |
603 | |
604 | if (skb_transport_offset(skb) + 4 <= skb->len) { | |
605 | /* All current transport protocols have the port numbers in the | |
606 | * first four bytes of the transport header and this function is | |
607 | * written with this assumption in mind. | |
608 | */ | |
609 | ||
610 | sin6.sin6_family = AF_INET6; | |
4e3fd7a0 | 611 | sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
6c468622 BS |
612 | sin6.sin6_port = ports[1]; |
613 | sin6.sin6_flowinfo = 0; | |
3868b7aa HFS |
614 | sin6.sin6_scope_id = |
615 | ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, | |
616 | opt->iif); | |
6c468622 BS |
617 | |
618 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); | |
619 | } | |
620 | } | |
4b261c75 HFS |
621 | } |
622 | ||
623 | void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, | |
624 | struct sk_buff *skb) | |
625 | { | |
626 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
627 | ip6_datagram_recv_specific_ctl(sk, msg, skb); | |
1da177e4 | 628 | } |
8e72d37e | 629 | EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
1da177e4 | 630 | |
73df66f8 TP |
631 | int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
632 | struct msghdr *msg, struct flowi6 *fl6, | |
633 | struct ipv6_txoptions *opt, | |
634 | int *hlimit, int *tclass, int *dontfrag) | |
1da177e4 LT |
635 | { |
636 | struct in6_pktinfo *src_info; | |
637 | struct cmsghdr *cmsg; | |
638 | struct ipv6_rt_hdr *rthdr; | |
639 | struct ipv6_opt_hdr *hdr; | |
640 | int len; | |
641 | int err = 0; | |
642 | ||
643 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
644 | int addr_type; | |
1da177e4 LT |
645 | |
646 | if (!CMSG_OK(msg, cmsg)) { | |
647 | err = -EINVAL; | |
648 | goto exit_f; | |
649 | } | |
650 | ||
651 | if (cmsg->cmsg_level != SOL_IPV6) | |
652 | continue; | |
653 | ||
654 | switch (cmsg->cmsg_type) { | |
1ab1457c YH |
655 | case IPV6_PKTINFO: |
656 | case IPV6_2292PKTINFO: | |
187e3838 YH |
657 | { |
658 | struct net_device *dev = NULL; | |
659 | ||
1ab1457c | 660 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
1da177e4 LT |
661 | err = -EINVAL; |
662 | goto exit_f; | |
663 | } | |
664 | ||
665 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
1ab1457c | 666 | |
1da177e4 | 667 | if (src_info->ipi6_ifindex) { |
4c9483b2 DM |
668 | if (fl6->flowi6_oif && |
669 | src_info->ipi6_ifindex != fl6->flowi6_oif) | |
1da177e4 | 670 | return -EINVAL; |
4c9483b2 | 671 | fl6->flowi6_oif = src_info->ipi6_ifindex; |
1da177e4 LT |
672 | } |
673 | ||
187e3838 | 674 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
1da177e4 | 675 | |
536b2e92 | 676 | rcu_read_lock(); |
4c9483b2 DM |
677 | if (fl6->flowi6_oif) { |
678 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
536b2e92 ED |
679 | if (!dev) { |
680 | rcu_read_unlock(); | |
187e3838 | 681 | return -ENODEV; |
536b2e92 ED |
682 | } |
683 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
684 | rcu_read_unlock(); | |
187e3838 | 685 | return -EINVAL; |
536b2e92 | 686 | } |
1ab1457c | 687 | |
187e3838 YH |
688 | if (addr_type != IPV6_ADDR_ANY) { |
689 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; | |
2563fa59 | 690 | if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && |
ec0506db | 691 | !ipv6_chk_addr(net, &src_info->ipi6_addr, |
7c90cc2d FLB |
692 | strict ? dev : NULL, 0) && |
693 | !ipv6_chk_acast_addr_src(net, dev, | |
694 | &src_info->ipi6_addr)) | |
187e3838 YH |
695 | err = -EINVAL; |
696 | else | |
4e3fd7a0 | 697 | fl6->saddr = src_info->ipi6_addr; |
1da177e4 | 698 | } |
187e3838 | 699 | |
536b2e92 | 700 | rcu_read_unlock(); |
1da177e4 | 701 | |
187e3838 YH |
702 | if (err) |
703 | goto exit_f; | |
704 | ||
1da177e4 | 705 | break; |
187e3838 | 706 | } |
1da177e4 LT |
707 | |
708 | case IPV6_FLOWINFO: | |
1ab1457c | 709 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
1da177e4 LT |
710 | err = -EINVAL; |
711 | goto exit_f; | |
712 | } | |
713 | ||
4c9483b2 DM |
714 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
715 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { | |
1da177e4 LT |
716 | err = -EINVAL; |
717 | goto exit_f; | |
718 | } | |
719 | } | |
4c9483b2 | 720 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
1da177e4 LT |
721 | break; |
722 | ||
333fad53 | 723 | case IPV6_2292HOPOPTS: |
1da177e4 | 724 | case IPV6_HOPOPTS: |
1ab1457c | 725 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
726 | err = -EINVAL; |
727 | goto exit_f; | |
728 | } | |
729 | ||
730 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
731 | len = ((hdr->hdrlen + 1) << 3); | |
732 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
733 | err = -EINVAL; | |
734 | goto exit_f; | |
735 | } | |
af31f412 | 736 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
737 | err = -EPERM; |
738 | goto exit_f; | |
739 | } | |
740 | opt->opt_nflen += len; | |
741 | opt->hopopt = hdr; | |
742 | break; | |
743 | ||
333fad53 | 744 | case IPV6_2292DSTOPTS: |
1ab1457c | 745 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
746 | err = -EINVAL; |
747 | goto exit_f; | |
748 | } | |
749 | ||
750 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
751 | len = ((hdr->hdrlen + 1) << 3); | |
752 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
753 | err = -EINVAL; | |
754 | goto exit_f; | |
755 | } | |
af31f412 | 756 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
757 | err = -EPERM; |
758 | goto exit_f; | |
759 | } | |
760 | if (opt->dst1opt) { | |
761 | err = -EINVAL; | |
762 | goto exit_f; | |
763 | } | |
764 | opt->opt_flen += len; | |
765 | opt->dst1opt = hdr; | |
766 | break; | |
767 | ||
333fad53 YH |
768 | case IPV6_DSTOPTS: |
769 | case IPV6_RTHDRDSTOPTS: | |
770 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
771 | err = -EINVAL; | |
772 | goto exit_f; | |
773 | } | |
774 | ||
775 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
776 | len = ((hdr->hdrlen + 1) << 3); | |
777 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
778 | err = -EINVAL; | |
779 | goto exit_f; | |
780 | } | |
af31f412 | 781 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
333fad53 YH |
782 | err = -EPERM; |
783 | goto exit_f; | |
784 | } | |
785 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { | |
786 | opt->opt_flen += len; | |
787 | opt->dst1opt = hdr; | |
788 | } else { | |
789 | opt->opt_nflen += len; | |
790 | opt->dst0opt = hdr; | |
791 | } | |
792 | break; | |
793 | ||
794 | case IPV6_2292RTHDR: | |
1da177e4 | 795 | case IPV6_RTHDR: |
1ab1457c | 796 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
1da177e4 LT |
797 | err = -EINVAL; |
798 | goto exit_f; | |
799 | } | |
800 | ||
801 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
802 | ||
280a9d34 | 803 | switch (rthdr->type) { |
07a93626 | 804 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
280a9d34 | 805 | case IPV6_SRCRT_TYPE_2: |
6e093d9d BH |
806 | if (rthdr->hdrlen != 2 || |
807 | rthdr->segments_left != 1) { | |
808 | err = -EINVAL; | |
809 | goto exit_f; | |
810 | } | |
280a9d34 | 811 | break; |
bb4dbf9e | 812 | #endif |
280a9d34 | 813 | default: |
1da177e4 LT |
814 | err = -EINVAL; |
815 | goto exit_f; | |
816 | } | |
817 | ||
818 | len = ((rthdr->hdrlen + 1) << 3); | |
819 | ||
1ab1457c | 820 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
1da177e4 LT |
821 | err = -EINVAL; |
822 | goto exit_f; | |
823 | } | |
824 | ||
825 | /* segments left must also match */ | |
826 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
827 | err = -EINVAL; | |
828 | goto exit_f; | |
829 | } | |
830 | ||
831 | opt->opt_nflen += len; | |
832 | opt->srcrt = rthdr; | |
833 | ||
333fad53 | 834 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
1da177e4 LT |
835 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
836 | ||
837 | opt->opt_nflen += dsthdrlen; | |
838 | opt->dst0opt = opt->dst1opt; | |
839 | opt->dst1opt = NULL; | |
840 | opt->opt_flen -= dsthdrlen; | |
841 | } | |
842 | ||
843 | break; | |
844 | ||
333fad53 | 845 | case IPV6_2292HOPLIMIT: |
1da177e4 LT |
846 | case IPV6_HOPLIMIT: |
847 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
848 | err = -EINVAL; | |
849 | goto exit_f; | |
850 | } | |
851 | ||
852 | *hlimit = *(int *)CMSG_DATA(cmsg); | |
e8766fc8 SW |
853 | if (*hlimit < -1 || *hlimit > 0xff) { |
854 | err = -EINVAL; | |
855 | goto exit_f; | |
856 | } | |
857 | ||
1da177e4 LT |
858 | break; |
859 | ||
41a1f8ea YH |
860 | case IPV6_TCLASS: |
861 | { | |
862 | int tc; | |
863 | ||
864 | err = -EINVAL; | |
b5a4257c | 865 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
41a1f8ea | 866 | goto exit_f; |
41a1f8ea YH |
867 | |
868 | tc = *(int *)CMSG_DATA(cmsg); | |
d0ee011f | 869 | if (tc < -1 || tc > 0xff) |
41a1f8ea YH |
870 | goto exit_f; |
871 | ||
872 | err = 0; | |
873 | *tclass = tc; | |
874 | ||
13b52cd4 BH |
875 | break; |
876 | } | |
877 | ||
878 | case IPV6_DONTFRAG: | |
879 | { | |
880 | int df; | |
881 | ||
882 | err = -EINVAL; | |
b5a4257c | 883 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
13b52cd4 | 884 | goto exit_f; |
13b52cd4 BH |
885 | |
886 | df = *(int *)CMSG_DATA(cmsg); | |
887 | if (df < 0 || df > 1) | |
888 | goto exit_f; | |
889 | ||
890 | err = 0; | |
891 | *dontfrag = df; | |
892 | ||
41a1f8ea YH |
893 | break; |
894 | } | |
1da177e4 | 895 | default: |
64ce2073 | 896 | LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", |
1ab1457c | 897 | cmsg->cmsg_type); |
1da177e4 | 898 | err = -EINVAL; |
4a36702e | 899 | goto exit_f; |
3ff50b79 | 900 | } |
1da177e4 LT |
901 | } |
902 | ||
903 | exit_f: | |
904 | return err; | |
905 | } | |
73df66f8 | 906 | EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |
17ef66af LC |
907 | |
908 | void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, | |
909 | __u16 srcp, __u16 destp, int bucket) | |
910 | { | |
17ef66af LC |
911 | const struct in6_addr *dest, *src; |
912 | ||
efe4208f ED |
913 | dest = &sp->sk_v6_daddr; |
914 | src = &sp->sk_v6_rcv_saddr; | |
17ef66af LC |
915 | seq_printf(seq, |
916 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 917 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", |
17ef66af LC |
918 | bucket, |
919 | src->s6_addr32[0], src->s6_addr32[1], | |
920 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
921 | dest->s6_addr32[0], dest->s6_addr32[1], | |
922 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
923 | sp->sk_state, | |
924 | sk_wmem_alloc_get(sp), | |
925 | sk_rmem_alloc_get(sp), | |
926 | 0, 0L, 0, | |
927 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), | |
928 | 0, | |
929 | sock_i_ino(sp), | |
930 | atomic_read(&sp->sk_refcnt), sp, | |
931 | atomic_read(&sp->sk_drops)); | |
932 | } |