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> |
1da177e4 LT |
33 | |
34 | #include <linux/errqueue.h> | |
35 | #include <asm/uaccess.h> | |
36 | ||
a50feda5 | 37 | static bool ipv6_mapped_addr_any(const struct in6_addr *a) |
c15fea2d | 38 | { |
a50feda5 | 39 | return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); |
c15fea2d MM |
40 | } |
41 | ||
1da177e4 LT |
42 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
43 | { | |
44 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
45 | struct inet_sock *inet = inet_sk(sk); | |
46 | struct ipv6_pinfo *np = inet6_sk(sk); | |
20c59de2 | 47 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 48 | struct dst_entry *dst; |
4c9483b2 | 49 | struct flowi6 fl6; |
1da177e4 | 50 | struct ip6_flowlabel *flowlabel = NULL; |
20c59de2 | 51 | struct ipv6_txoptions *opt; |
1da177e4 LT |
52 | int addr_type; |
53 | int err; | |
54 | ||
55 | if (usin->sin6_family == AF_INET) { | |
56 | if (__ipv6_only_sock(sk)) | |
57 | return -EAFNOSUPPORT; | |
58 | err = ip4_datagram_connect(sk, uaddr, addr_len); | |
59 | goto ipv4_connected; | |
60 | } | |
61 | ||
62 | if (addr_len < SIN6_LEN_RFC2133) | |
1ab1457c | 63 | return -EINVAL; |
1da177e4 | 64 | |
1ab1457c YH |
65 | if (usin->sin6_family != AF_INET6) |
66 | return -EAFNOSUPPORT; | |
1da177e4 | 67 | |
4c9483b2 | 68 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 69 | if (np->sndflow) { |
4c9483b2 DM |
70 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
71 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
72 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
1da177e4 LT |
73 | if (flowlabel == NULL) |
74 | return -EINVAL; | |
4e3fd7a0 | 75 | usin->sin6_addr = flowlabel->dst; |
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 | |
c720c7e8 | 109 | ipv6_addr_set_v4mapped(inet->inet_daddr, &np->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 | |
c15fea2d MM |
115 | if (ipv6_addr_any(&np->rcv_saddr) || |
116 | ipv6_mapped_addr_any(&np->rcv_saddr)) { | |
c720c7e8 ED |
117 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
118 | &np->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 | ||
126 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
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 | ||
4e3fd7a0 | 147 | np->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; |
4e3fd7a0 AD |
158 | fl6.daddr = np->daddr; |
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 | |
4c9483b2 | 173 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
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 LT |
184 | |
185 | if (ipv6_addr_any(&np->rcv_saddr)) { | |
4e3fd7a0 | 186 | np->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, | |
4c9483b2 | 193 | ipv6_addr_equal(&fl6.daddr, &np->daddr) ? |
8e1ef0a9 YH |
194 | &np->daddr : NULL, |
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; | |
202 | out: | |
203 | fl6_sock_release(flowlabel); | |
204 | return err; | |
205 | } | |
a495f836 | 206 | EXPORT_SYMBOL_GPL(ip6_datagram_connect); |
1da177e4 | 207 | |
1ab1457c | 208 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
e69a4adc | 209 | __be16 port, u32 info, u8 *payload) |
1da177e4 LT |
210 | { |
211 | struct ipv6_pinfo *np = inet6_sk(sk); | |
cc70ab26 | 212 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 LT |
213 | struct sock_exterr_skb *serr; |
214 | ||
215 | if (!np->recverr) | |
216 | return; | |
217 | ||
218 | skb = skb_clone(skb, GFP_ATOMIC); | |
219 | if (!skb) | |
220 | return; | |
221 | ||
d40a4de0 BH |
222 | skb->protocol = htons(ETH_P_IPV6); |
223 | ||
1da177e4 LT |
224 | serr = SKB_EXT_ERR(skb); |
225 | serr->ee.ee_errno = err; | |
226 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; | |
1ab1457c | 227 | serr->ee.ee_type = icmph->icmp6_type; |
1da177e4 LT |
228 | serr->ee.ee_code = icmph->icmp6_code; |
229 | serr->ee.ee_pad = 0; | |
230 | serr->ee.ee_info = info; | |
231 | serr->ee.ee_data = 0; | |
d56f90a7 ACM |
232 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
233 | skb_network_header(skb); | |
1da177e4 LT |
234 | serr->port = port; |
235 | ||
1da177e4 | 236 | __skb_pull(skb, payload - skb->data); |
bd82393c | 237 | skb_reset_transport_header(skb); |
1da177e4 LT |
238 | |
239 | if (sock_queue_err_skb(sk, skb)) | |
240 | kfree_skb(skb); | |
241 | } | |
242 | ||
4c9483b2 | 243 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
1da177e4 LT |
244 | { |
245 | struct ipv6_pinfo *np = inet6_sk(sk); | |
246 | struct sock_exterr_skb *serr; | |
247 | struct ipv6hdr *iph; | |
248 | struct sk_buff *skb; | |
249 | ||
250 | if (!np->recverr) | |
251 | return; | |
252 | ||
253 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
254 | if (!skb) | |
255 | return; | |
256 | ||
d40a4de0 BH |
257 | skb->protocol = htons(ETH_P_IPV6); |
258 | ||
1ced98e8 ACM |
259 | skb_put(skb, sizeof(struct ipv6hdr)); |
260 | skb_reset_network_header(skb); | |
0660e03f | 261 | iph = ipv6_hdr(skb); |
4e3fd7a0 | 262 | iph->daddr = fl6->daddr; |
1da177e4 LT |
263 | |
264 | serr = SKB_EXT_ERR(skb); | |
265 | serr->ee.ee_errno = err; | |
266 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
1ab1457c | 267 | serr->ee.ee_type = 0; |
1da177e4 LT |
268 | serr->ee.ee_code = 0; |
269 | serr->ee.ee_pad = 0; | |
270 | serr->ee.ee_info = info; | |
271 | serr->ee.ee_data = 0; | |
d56f90a7 | 272 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1958b856 | 273 | serr->port = fl6->fl6_dport; |
1da177e4 | 274 | |
27a884dc | 275 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 276 | skb_reset_transport_header(skb); |
1da177e4 LT |
277 | |
278 | if (sock_queue_err_skb(sk, skb)) | |
279 | kfree_skb(skb); | |
280 | } | |
281 | ||
4c9483b2 | 282 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
4b340ae2 BH |
283 | { |
284 | struct ipv6_pinfo *np = inet6_sk(sk); | |
285 | struct ipv6hdr *iph; | |
286 | struct sk_buff *skb; | |
287 | struct ip6_mtuinfo *mtu_info; | |
288 | ||
289 | if (!np->rxopt.bits.rxpmtu) | |
290 | return; | |
291 | ||
292 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
293 | if (!skb) | |
294 | return; | |
295 | ||
296 | skb_put(skb, sizeof(struct ipv6hdr)); | |
297 | skb_reset_network_header(skb); | |
298 | iph = ipv6_hdr(skb); | |
4e3fd7a0 | 299 | iph->daddr = fl6->daddr; |
4b340ae2 BH |
300 | |
301 | mtu_info = IP6CBMTU(skb); | |
4b340ae2 BH |
302 | |
303 | mtu_info->ip6m_mtu = mtu; | |
304 | mtu_info->ip6m_addr.sin6_family = AF_INET6; | |
305 | mtu_info->ip6m_addr.sin6_port = 0; | |
306 | mtu_info->ip6m_addr.sin6_flowinfo = 0; | |
4c9483b2 | 307 | mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
4e3fd7a0 | 308 | mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; |
4b340ae2 BH |
309 | |
310 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); | |
311 | skb_reset_transport_header(skb); | |
312 | ||
313 | skb = xchg(&np->rxpmtu, skb); | |
314 | kfree_skb(skb); | |
315 | } | |
316 | ||
1ab1457c | 317 | /* |
1da177e4 LT |
318 | * Handle MSG_ERRQUEUE |
319 | */ | |
320 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
321 | { | |
322 | struct ipv6_pinfo *np = inet6_sk(sk); | |
323 | struct sock_exterr_skb *serr; | |
324 | struct sk_buff *skb, *skb2; | |
325 | struct sockaddr_in6 *sin; | |
326 | struct { | |
327 | struct sock_extended_err ee; | |
328 | struct sockaddr_in6 offender; | |
329 | } errhdr; | |
330 | int err; | |
331 | int copied; | |
332 | ||
333 | err = -EAGAIN; | |
334 | skb = skb_dequeue(&sk->sk_error_queue); | |
335 | if (skb == NULL) | |
336 | goto out; | |
337 | ||
338 | copied = skb->len; | |
339 | if (copied > len) { | |
340 | msg->msg_flags |= MSG_TRUNC; | |
341 | copied = len; | |
342 | } | |
343 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
344 | if (err) | |
345 | goto out_free_skb; | |
346 | ||
347 | sock_recv_timestamp(msg, sk, skb); | |
348 | ||
349 | serr = SKB_EXT_ERR(skb); | |
350 | ||
351 | sin = (struct sockaddr_in6 *)msg->msg_name; | |
352 | if (sin) { | |
d56f90a7 | 353 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
354 | sin->sin6_family = AF_INET6; |
355 | sin->sin6_flowinfo = 0; | |
1ab1457c | 356 | sin->sin6_port = serr->port; |
1da177e4 | 357 | sin->sin6_scope_id = 0; |
d40a4de0 | 358 | if (skb->protocol == htons(ETH_P_IPV6)) { |
4e3fd7a0 AD |
359 | sin->sin6_addr = |
360 | *(struct in6_addr *)(nh + serr->addr_offset); | |
1da177e4 | 361 | if (np->sndflow) |
d56f90a7 ACM |
362 | sin->sin6_flowinfo = |
363 | (*(__be32 *)(nh + serr->addr_offset - 24) & | |
364 | IPV6_FLOWINFO_MASK); | |
1da177e4 LT |
365 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
366 | sin->sin6_scope_id = IP6CB(skb)->iif; | |
367 | } else { | |
b301e82c BH |
368 | ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
369 | &sin->sin6_addr); | |
1da177e4 LT |
370 | } |
371 | } | |
372 | ||
373 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
374 | sin = &errhdr.offender; | |
375 | sin->sin6_family = AF_UNSPEC; | |
376 | if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { | |
377 | sin->sin6_family = AF_INET6; | |
378 | sin->sin6_flowinfo = 0; | |
379 | sin->sin6_scope_id = 0; | |
d40a4de0 | 380 | if (skb->protocol == htons(ETH_P_IPV6)) { |
4e3fd7a0 | 381 | sin->sin6_addr = ipv6_hdr(skb)->saddr; |
1da177e4 | 382 | if (np->rxopt.all) |
73df66f8 | 383 | ip6_datagram_recv_ctl(sk, msg, skb); |
1da177e4 LT |
384 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
385 | sin->sin6_scope_id = IP6CB(skb)->iif; | |
386 | } else { | |
387 | struct inet_sock *inet = inet_sk(sk); | |
388 | ||
b301e82c BH |
389 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
390 | &sin->sin6_addr); | |
1da177e4 LT |
391 | if (inet->cmsg_flags) |
392 | ip_cmsg_recv(msg, skb); | |
393 | } | |
394 | } | |
395 | ||
396 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); | |
397 | ||
398 | /* Now we could try to dump offended packet options */ | |
399 | ||
400 | msg->msg_flags |= MSG_ERRQUEUE; | |
401 | err = copied; | |
402 | ||
403 | /* Reset and regenerate socket error */ | |
e0f9f858 | 404 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
405 | sk->sk_err = 0; |
406 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
407 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
e0f9f858 | 408 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
409 | sk->sk_error_report(sk); |
410 | } else { | |
e0f9f858 | 411 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
412 | } |
413 | ||
1ab1457c | 414 | out_free_skb: |
1da177e4 LT |
415 | kfree_skb(skb); |
416 | out: | |
417 | return err; | |
418 | } | |
a495f836 | 419 | EXPORT_SYMBOL_GPL(ipv6_recv_error); |
1da177e4 | 420 | |
4b340ae2 BH |
421 | /* |
422 | * Handle IPV6_RECVPATHMTU | |
423 | */ | |
424 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len) | |
425 | { | |
426 | struct ipv6_pinfo *np = inet6_sk(sk); | |
427 | struct sk_buff *skb; | |
428 | struct sockaddr_in6 *sin; | |
429 | struct ip6_mtuinfo mtu_info; | |
430 | int err; | |
431 | int copied; | |
432 | ||
433 | err = -EAGAIN; | |
434 | skb = xchg(&np->rxpmtu, NULL); | |
435 | if (skb == NULL) | |
436 | goto out; | |
437 | ||
438 | copied = skb->len; | |
439 | if (copied > len) { | |
440 | msg->msg_flags |= MSG_TRUNC; | |
441 | copied = len; | |
442 | } | |
443 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
444 | if (err) | |
445 | goto out_free_skb; | |
446 | ||
447 | sock_recv_timestamp(msg, sk, skb); | |
448 | ||
449 | memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); | |
450 | ||
451 | sin = (struct sockaddr_in6 *)msg->msg_name; | |
452 | if (sin) { | |
453 | sin->sin6_family = AF_INET6; | |
454 | sin->sin6_flowinfo = 0; | |
455 | sin->sin6_port = 0; | |
456 | sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; | |
4e3fd7a0 | 457 | sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; |
4b340ae2 BH |
458 | } |
459 | ||
460 | put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); | |
461 | ||
462 | err = copied; | |
463 | ||
464 | out_free_skb: | |
465 | kfree_skb(skb); | |
466 | out: | |
467 | return err; | |
468 | } | |
1da177e4 LT |
469 | |
470 | ||
73df66f8 TP |
471 | int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, |
472 | struct sk_buff *skb) | |
1da177e4 LT |
473 | { |
474 | struct ipv6_pinfo *np = inet6_sk(sk); | |
475 | struct inet6_skb_parm *opt = IP6CB(skb); | |
d56f90a7 | 476 | unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
477 | |
478 | if (np->rxopt.bits.rxinfo) { | |
479 | struct in6_pktinfo src_info; | |
480 | ||
481 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 482 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
1da177e4 LT |
483 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); |
484 | } | |
485 | ||
486 | if (np->rxopt.bits.rxhlim) { | |
0660e03f | 487 | int hlim = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
488 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
489 | } | |
490 | ||
41a1f8ea | 491 | if (np->rxopt.bits.rxtclass) { |
7a3198a8 | 492 | int tclass = ipv6_tclass(ipv6_hdr(skb)); |
41a1f8ea YH |
493 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
494 | } | |
495 | ||
d56f90a7 ACM |
496 | if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { |
497 | __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; | |
1da177e4 LT |
498 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); |
499 | } | |
333fad53 YH |
500 | |
501 | /* HbH is allowed only once */ | |
1da177e4 | 502 | if (np->rxopt.bits.hopopts && opt->hop) { |
d56f90a7 | 503 | u8 *ptr = nh + opt->hop; |
1da177e4 LT |
504 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
505 | } | |
333fad53 YH |
506 | |
507 | if (opt->lastopt && | |
508 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { | |
509 | /* | |
510 | * Silly enough, but we need to reparse in order to | |
511 | * report extension headers (except for HbH) | |
512 | * in order. | |
513 | * | |
1ab1457c | 514 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
333fad53 YH |
515 | * (and WILL NOT be) defined because |
516 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji | |
517 | */ | |
518 | unsigned int off = sizeof(struct ipv6hdr); | |
0660e03f | 519 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
333fad53 YH |
520 | |
521 | while (off <= opt->lastopt) { | |
95c96174 | 522 | unsigned int len; |
d56f90a7 | 523 | u8 *ptr = nh + off; |
333fad53 | 524 | |
b5a4257c | 525 | switch (nexthdr) { |
333fad53 YH |
526 | case IPPROTO_DSTOPTS: |
527 | nexthdr = ptr[0]; | |
528 | len = (ptr[1] + 1) << 3; | |
529 | if (np->rxopt.bits.dstopts) | |
530 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); | |
531 | break; | |
532 | case IPPROTO_ROUTING: | |
533 | nexthdr = ptr[0]; | |
534 | len = (ptr[1] + 1) << 3; | |
535 | if (np->rxopt.bits.srcrt) | |
536 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); | |
537 | break; | |
538 | case IPPROTO_AH: | |
539 | nexthdr = ptr[0]; | |
a3059893 | 540 | len = (ptr[1] + 2) << 2; |
333fad53 YH |
541 | break; |
542 | default: | |
543 | nexthdr = ptr[0]; | |
544 | len = (ptr[1] + 1) << 3; | |
545 | break; | |
546 | } | |
547 | ||
548 | off += len; | |
549 | } | |
550 | } | |
551 | ||
552 | /* socket options in old style */ | |
553 | if (np->rxopt.bits.rxoinfo) { | |
554 | struct in6_pktinfo src_info; | |
555 | ||
556 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 557 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
333fad53 YH |
558 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
559 | } | |
560 | if (np->rxopt.bits.rxohlim) { | |
0660e03f | 561 | int hlim = ipv6_hdr(skb)->hop_limit; |
333fad53 YH |
562 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
563 | } | |
564 | if (np->rxopt.bits.ohopopts && opt->hop) { | |
d56f90a7 | 565 | u8 *ptr = nh + opt->hop; |
333fad53 YH |
566 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
567 | } | |
568 | if (np->rxopt.bits.odstopts && opt->dst0) { | |
d56f90a7 | 569 | u8 *ptr = nh + opt->dst0; |
333fad53 | 570 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 571 | } |
333fad53 | 572 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
d56f90a7 | 573 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
333fad53 | 574 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
1da177e4 | 575 | } |
333fad53 | 576 | if (np->rxopt.bits.odstopts && opt->dst1) { |
d56f90a7 | 577 | u8 *ptr = nh + opt->dst1; |
333fad53 | 578 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 579 | } |
6c468622 BS |
580 | if (np->rxopt.bits.rxorigdstaddr) { |
581 | struct sockaddr_in6 sin6; | |
747465ef | 582 | __be16 *ports = (__be16 *) skb_transport_header(skb); |
6c468622 BS |
583 | |
584 | if (skb_transport_offset(skb) + 4 <= skb->len) { | |
585 | /* All current transport protocols have the port numbers in the | |
586 | * first four bytes of the transport header and this function is | |
587 | * written with this assumption in mind. | |
588 | */ | |
589 | ||
590 | sin6.sin6_family = AF_INET6; | |
4e3fd7a0 | 591 | sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
6c468622 BS |
592 | sin6.sin6_port = ports[1]; |
593 | sin6.sin6_flowinfo = 0; | |
594 | sin6.sin6_scope_id = 0; | |
595 | ||
596 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); | |
597 | } | |
598 | } | |
1da177e4 LT |
599 | return 0; |
600 | } | |
8e72d37e | 601 | EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
1da177e4 | 602 | |
73df66f8 TP |
603 | int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
604 | struct msghdr *msg, struct flowi6 *fl6, | |
605 | struct ipv6_txoptions *opt, | |
606 | int *hlimit, int *tclass, int *dontfrag) | |
1da177e4 LT |
607 | { |
608 | struct in6_pktinfo *src_info; | |
609 | struct cmsghdr *cmsg; | |
610 | struct ipv6_rt_hdr *rthdr; | |
611 | struct ipv6_opt_hdr *hdr; | |
612 | int len; | |
613 | int err = 0; | |
614 | ||
615 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
616 | int addr_type; | |
1da177e4 LT |
617 | |
618 | if (!CMSG_OK(msg, cmsg)) { | |
619 | err = -EINVAL; | |
620 | goto exit_f; | |
621 | } | |
622 | ||
623 | if (cmsg->cmsg_level != SOL_IPV6) | |
624 | continue; | |
625 | ||
626 | switch (cmsg->cmsg_type) { | |
1ab1457c YH |
627 | case IPV6_PKTINFO: |
628 | case IPV6_2292PKTINFO: | |
187e3838 YH |
629 | { |
630 | struct net_device *dev = NULL; | |
631 | ||
1ab1457c | 632 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
1da177e4 LT |
633 | err = -EINVAL; |
634 | goto exit_f; | |
635 | } | |
636 | ||
637 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
1ab1457c | 638 | |
1da177e4 | 639 | if (src_info->ipi6_ifindex) { |
4c9483b2 DM |
640 | if (fl6->flowi6_oif && |
641 | src_info->ipi6_ifindex != fl6->flowi6_oif) | |
1da177e4 | 642 | return -EINVAL; |
4c9483b2 | 643 | fl6->flowi6_oif = src_info->ipi6_ifindex; |
1da177e4 LT |
644 | } |
645 | ||
187e3838 | 646 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
1da177e4 | 647 | |
536b2e92 | 648 | rcu_read_lock(); |
4c9483b2 DM |
649 | if (fl6->flowi6_oif) { |
650 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
536b2e92 ED |
651 | if (!dev) { |
652 | rcu_read_unlock(); | |
187e3838 | 653 | return -ENODEV; |
536b2e92 ED |
654 | } |
655 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
656 | rcu_read_unlock(); | |
187e3838 | 657 | return -EINVAL; |
536b2e92 | 658 | } |
1ab1457c | 659 | |
187e3838 YH |
660 | if (addr_type != IPV6_ADDR_ANY) { |
661 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; | |
2563fa59 | 662 | if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && |
ec0506db | 663 | !ipv6_chk_addr(net, &src_info->ipi6_addr, |
187e3838 YH |
664 | strict ? dev : NULL, 0)) |
665 | err = -EINVAL; | |
666 | else | |
4e3fd7a0 | 667 | fl6->saddr = src_info->ipi6_addr; |
1da177e4 | 668 | } |
187e3838 | 669 | |
536b2e92 | 670 | rcu_read_unlock(); |
1da177e4 | 671 | |
187e3838 YH |
672 | if (err) |
673 | goto exit_f; | |
674 | ||
1da177e4 | 675 | break; |
187e3838 | 676 | } |
1da177e4 LT |
677 | |
678 | case IPV6_FLOWINFO: | |
1ab1457c | 679 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
1da177e4 LT |
680 | err = -EINVAL; |
681 | goto exit_f; | |
682 | } | |
683 | ||
4c9483b2 DM |
684 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
685 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { | |
1da177e4 LT |
686 | err = -EINVAL; |
687 | goto exit_f; | |
688 | } | |
689 | } | |
4c9483b2 | 690 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
1da177e4 LT |
691 | break; |
692 | ||
333fad53 | 693 | case IPV6_2292HOPOPTS: |
1da177e4 | 694 | case IPV6_HOPOPTS: |
1ab1457c | 695 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
696 | err = -EINVAL; |
697 | goto exit_f; | |
698 | } | |
699 | ||
700 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
701 | len = ((hdr->hdrlen + 1) << 3); | |
702 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
703 | err = -EINVAL; | |
704 | goto exit_f; | |
705 | } | |
af31f412 | 706 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
707 | err = -EPERM; |
708 | goto exit_f; | |
709 | } | |
710 | opt->opt_nflen += len; | |
711 | opt->hopopt = hdr; | |
712 | break; | |
713 | ||
333fad53 | 714 | case IPV6_2292DSTOPTS: |
1ab1457c | 715 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
716 | err = -EINVAL; |
717 | goto exit_f; | |
718 | } | |
719 | ||
720 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
721 | len = ((hdr->hdrlen + 1) << 3); | |
722 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
723 | err = -EINVAL; | |
724 | goto exit_f; | |
725 | } | |
af31f412 | 726 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
727 | err = -EPERM; |
728 | goto exit_f; | |
729 | } | |
730 | if (opt->dst1opt) { | |
731 | err = -EINVAL; | |
732 | goto exit_f; | |
733 | } | |
734 | opt->opt_flen += len; | |
735 | opt->dst1opt = hdr; | |
736 | break; | |
737 | ||
333fad53 YH |
738 | case IPV6_DSTOPTS: |
739 | case IPV6_RTHDRDSTOPTS: | |
740 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
741 | err = -EINVAL; | |
742 | goto exit_f; | |
743 | } | |
744 | ||
745 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
746 | len = ((hdr->hdrlen + 1) << 3); | |
747 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
748 | err = -EINVAL; | |
749 | goto exit_f; | |
750 | } | |
af31f412 | 751 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
333fad53 YH |
752 | err = -EPERM; |
753 | goto exit_f; | |
754 | } | |
755 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { | |
756 | opt->opt_flen += len; | |
757 | opt->dst1opt = hdr; | |
758 | } else { | |
759 | opt->opt_nflen += len; | |
760 | opt->dst0opt = hdr; | |
761 | } | |
762 | break; | |
763 | ||
764 | case IPV6_2292RTHDR: | |
1da177e4 | 765 | case IPV6_RTHDR: |
1ab1457c | 766 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
1da177e4 LT |
767 | err = -EINVAL; |
768 | goto exit_f; | |
769 | } | |
770 | ||
771 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
772 | ||
280a9d34 | 773 | switch (rthdr->type) { |
07a93626 | 774 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
280a9d34 | 775 | case IPV6_SRCRT_TYPE_2: |
6e093d9d BH |
776 | if (rthdr->hdrlen != 2 || |
777 | rthdr->segments_left != 1) { | |
778 | err = -EINVAL; | |
779 | goto exit_f; | |
780 | } | |
280a9d34 | 781 | break; |
bb4dbf9e | 782 | #endif |
280a9d34 | 783 | default: |
1da177e4 LT |
784 | err = -EINVAL; |
785 | goto exit_f; | |
786 | } | |
787 | ||
788 | len = ((rthdr->hdrlen + 1) << 3); | |
789 | ||
1ab1457c | 790 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
1da177e4 LT |
791 | err = -EINVAL; |
792 | goto exit_f; | |
793 | } | |
794 | ||
795 | /* segments left must also match */ | |
796 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
797 | err = -EINVAL; | |
798 | goto exit_f; | |
799 | } | |
800 | ||
801 | opt->opt_nflen += len; | |
802 | opt->srcrt = rthdr; | |
803 | ||
333fad53 | 804 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
1da177e4 LT |
805 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
806 | ||
807 | opt->opt_nflen += dsthdrlen; | |
808 | opt->dst0opt = opt->dst1opt; | |
809 | opt->dst1opt = NULL; | |
810 | opt->opt_flen -= dsthdrlen; | |
811 | } | |
812 | ||
813 | break; | |
814 | ||
333fad53 | 815 | case IPV6_2292HOPLIMIT: |
1da177e4 LT |
816 | case IPV6_HOPLIMIT: |
817 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
818 | err = -EINVAL; | |
819 | goto exit_f; | |
820 | } | |
821 | ||
822 | *hlimit = *(int *)CMSG_DATA(cmsg); | |
e8766fc8 SW |
823 | if (*hlimit < -1 || *hlimit > 0xff) { |
824 | err = -EINVAL; | |
825 | goto exit_f; | |
826 | } | |
827 | ||
1da177e4 LT |
828 | break; |
829 | ||
41a1f8ea YH |
830 | case IPV6_TCLASS: |
831 | { | |
832 | int tc; | |
833 | ||
834 | err = -EINVAL; | |
b5a4257c | 835 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
41a1f8ea | 836 | goto exit_f; |
41a1f8ea YH |
837 | |
838 | tc = *(int *)CMSG_DATA(cmsg); | |
d0ee011f | 839 | if (tc < -1 || tc > 0xff) |
41a1f8ea YH |
840 | goto exit_f; |
841 | ||
842 | err = 0; | |
843 | *tclass = tc; | |
844 | ||
13b52cd4 BH |
845 | break; |
846 | } | |
847 | ||
848 | case IPV6_DONTFRAG: | |
849 | { | |
850 | int df; | |
851 | ||
852 | err = -EINVAL; | |
b5a4257c | 853 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
13b52cd4 | 854 | goto exit_f; |
13b52cd4 BH |
855 | |
856 | df = *(int *)CMSG_DATA(cmsg); | |
857 | if (df < 0 || df > 1) | |
858 | goto exit_f; | |
859 | ||
860 | err = 0; | |
861 | *dontfrag = df; | |
862 | ||
41a1f8ea YH |
863 | break; |
864 | } | |
1da177e4 | 865 | default: |
64ce2073 | 866 | LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", |
1ab1457c | 867 | cmsg->cmsg_type); |
1da177e4 | 868 | err = -EINVAL; |
4a36702e | 869 | goto exit_f; |
3ff50b79 | 870 | } |
1da177e4 LT |
871 | } |
872 | ||
873 | exit_f: | |
874 | return err; | |
875 | } | |
73df66f8 | 876 | EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |