]>
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; | |
46 | struct inet_sock *inet = inet_sk(sk); | |
47 | struct ipv6_pinfo *np = inet6_sk(sk); | |
20c59de2 | 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; |
20c59de2 | 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; | |
4e3fd7a0 | 76 | usin->sin6_addr = flowlabel->dst; |
1da177e4 LT |
77 | } |
78 | } | |
79 | ||
80 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
81 | ||
82 | if (addr_type == IPV6_ADDR_ANY) { | |
83 | /* | |
84 | * connect to self | |
85 | */ | |
86 | usin->sin6_addr.s6_addr[15] = 0x01; | |
87 | } | |
88 | ||
89 | daddr = &usin->sin6_addr; | |
90 | ||
91 | if (addr_type == IPV6_ADDR_MAPPED) { | |
92 | struct sockaddr_in sin; | |
93 | ||
94 | if (__ipv6_only_sock(sk)) { | |
95 | err = -ENETUNREACH; | |
96 | goto out; | |
97 | } | |
98 | sin.sin_family = AF_INET; | |
99 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; | |
100 | sin.sin_port = usin->sin6_port; | |
101 | ||
1ab1457c | 102 | err = ip4_datagram_connect(sk, |
b5a4257c | 103 | (struct sockaddr *) &sin, |
1da177e4 LT |
104 | sizeof(sin)); |
105 | ||
106 | ipv4_connected: | |
107 | if (err) | |
108 | goto out; | |
1ab1457c | 109 | |
c720c7e8 | 110 | ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr); |
1da177e4 | 111 | |
c15fea2d MM |
112 | if (ipv6_addr_any(&np->saddr) || |
113 | ipv6_mapped_addr_any(&np->saddr)) | |
c720c7e8 | 114 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
b301e82c | 115 | |
c15fea2d MM |
116 | if (ipv6_addr_any(&np->rcv_saddr) || |
117 | ipv6_mapped_addr_any(&np->rcv_saddr)) { | |
c720c7e8 ED |
118 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
119 | &np->rcv_saddr); | |
719f8358 ED |
120 | if (sk->sk_prot->rehash) |
121 | sk->sk_prot->rehash(sk); | |
122 | } | |
1da177e4 | 123 | |
1da177e4 LT |
124 | goto out; |
125 | } | |
126 | ||
127 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
128 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
129 | usin->sin6_scope_id) { | |
130 | if (sk->sk_bound_dev_if && | |
131 | sk->sk_bound_dev_if != usin->sin6_scope_id) { | |
132 | err = -EINVAL; | |
133 | goto out; | |
134 | } | |
135 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
1da177e4 LT |
136 | } |
137 | ||
1ac4f008 BH |
138 | if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) |
139 | sk->sk_bound_dev_if = np->mcast_oif; | |
140 | ||
1da177e4 LT |
141 | /* Connect to link-local address requires an interface */ |
142 | if (!sk->sk_bound_dev_if) { | |
143 | err = -EINVAL; | |
144 | goto out; | |
145 | } | |
146 | } | |
147 | ||
4e3fd7a0 | 148 | np->daddr = *daddr; |
4c9483b2 | 149 | np->flow_label = fl6.flowlabel; |
1da177e4 | 150 | |
c720c7e8 | 151 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
152 | |
153 | /* | |
154 | * Check for a route to destination an obtain the | |
155 | * destination cache for it. | |
156 | */ | |
157 | ||
4c9483b2 | 158 | fl6.flowi6_proto = sk->sk_protocol; |
4e3fd7a0 AD |
159 | fl6.daddr = np->daddr; |
160 | fl6.saddr = np->saddr; | |
4c9483b2 DM |
161 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
162 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
163 | fl6.fl6_dport = inet->inet_dport; |
164 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 165 | |
4c9483b2 DM |
166 | if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) |
167 | fl6.flowi6_oif = np->mcast_oif; | |
1da177e4 | 168 | |
4c9483b2 | 169 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 170 | |
20c59de2 | 171 | opt = flowlabel ? flowlabel->opt : np->opt; |
4c9483b2 | 172 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 173 | |
4c9483b2 | 174 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
175 | err = 0; |
176 | if (IS_ERR(dst)) { | |
177 | err = PTR_ERR(dst); | |
1da177e4 | 178 | goto out; |
14e50e57 | 179 | } |
1da177e4 LT |
180 | |
181 | /* source address lookup done in ip6_dst_lookup */ | |
182 | ||
183 | if (ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 184 | np->saddr = fl6.saddr; |
1da177e4 LT |
185 | |
186 | if (ipv6_addr_any(&np->rcv_saddr)) { | |
4e3fd7a0 | 187 | np->rcv_saddr = fl6.saddr; |
c720c7e8 | 188 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
719f8358 ED |
189 | if (sk->sk_prot->rehash) |
190 | sk->sk_prot->rehash(sk); | |
1da177e4 LT |
191 | } |
192 | ||
193 | ip6_dst_store(sk, dst, | |
4c9483b2 | 194 | ipv6_addr_equal(&fl6.daddr, &np->daddr) ? |
8e1ef0a9 YH |
195 | &np->daddr : NULL, |
196 | #ifdef CONFIG_IPV6_SUBTREES | |
4c9483b2 | 197 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
198 | &np->saddr : |
199 | #endif | |
200 | NULL); | |
1da177e4 LT |
201 | |
202 | sk->sk_state = TCP_ESTABLISHED; | |
203 | out: | |
204 | fl6_sock_release(flowlabel); | |
205 | return err; | |
206 | } | |
a495f836 | 207 | EXPORT_SYMBOL_GPL(ip6_datagram_connect); |
1da177e4 | 208 | |
1ab1457c | 209 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
e69a4adc | 210 | __be16 port, u32 info, u8 *payload) |
1da177e4 LT |
211 | { |
212 | struct ipv6_pinfo *np = inet6_sk(sk); | |
cc70ab26 | 213 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 LT |
214 | struct sock_exterr_skb *serr; |
215 | ||
216 | if (!np->recverr) | |
217 | return; | |
218 | ||
219 | skb = skb_clone(skb, GFP_ATOMIC); | |
220 | if (!skb) | |
221 | return; | |
222 | ||
d40a4de0 BH |
223 | skb->protocol = htons(ETH_P_IPV6); |
224 | ||
1da177e4 LT |
225 | serr = SKB_EXT_ERR(skb); |
226 | serr->ee.ee_errno = err; | |
227 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; | |
1ab1457c | 228 | serr->ee.ee_type = icmph->icmp6_type; |
1da177e4 LT |
229 | serr->ee.ee_code = icmph->icmp6_code; |
230 | serr->ee.ee_pad = 0; | |
231 | serr->ee.ee_info = info; | |
232 | serr->ee.ee_data = 0; | |
d56f90a7 ACM |
233 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
234 | skb_network_header(skb); | |
1da177e4 LT |
235 | serr->port = port; |
236 | ||
1da177e4 | 237 | __skb_pull(skb, payload - skb->data); |
bd82393c | 238 | skb_reset_transport_header(skb); |
1da177e4 LT |
239 | |
240 | if (sock_queue_err_skb(sk, skb)) | |
241 | kfree_skb(skb); | |
242 | } | |
243 | ||
4c9483b2 | 244 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
1da177e4 LT |
245 | { |
246 | struct ipv6_pinfo *np = inet6_sk(sk); | |
247 | struct sock_exterr_skb *serr; | |
248 | struct ipv6hdr *iph; | |
249 | struct sk_buff *skb; | |
250 | ||
251 | if (!np->recverr) | |
252 | return; | |
253 | ||
254 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
255 | if (!skb) | |
256 | return; | |
257 | ||
d40a4de0 BH |
258 | skb->protocol = htons(ETH_P_IPV6); |
259 | ||
1ced98e8 ACM |
260 | skb_put(skb, sizeof(struct ipv6hdr)); |
261 | skb_reset_network_header(skb); | |
0660e03f | 262 | iph = ipv6_hdr(skb); |
4e3fd7a0 | 263 | iph->daddr = fl6->daddr; |
1da177e4 LT |
264 | |
265 | serr = SKB_EXT_ERR(skb); | |
266 | serr->ee.ee_errno = err; | |
267 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
1ab1457c | 268 | serr->ee.ee_type = 0; |
1da177e4 LT |
269 | serr->ee.ee_code = 0; |
270 | serr->ee.ee_pad = 0; | |
271 | serr->ee.ee_info = info; | |
272 | serr->ee.ee_data = 0; | |
d56f90a7 | 273 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1958b856 | 274 | serr->port = fl6->fl6_dport; |
1da177e4 | 275 | |
27a884dc | 276 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 277 | skb_reset_transport_header(skb); |
1da177e4 LT |
278 | |
279 | if (sock_queue_err_skb(sk, skb)) | |
280 | kfree_skb(skb); | |
281 | } | |
282 | ||
4c9483b2 | 283 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
4b340ae2 BH |
284 | { |
285 | struct ipv6_pinfo *np = inet6_sk(sk); | |
286 | struct ipv6hdr *iph; | |
287 | struct sk_buff *skb; | |
288 | struct ip6_mtuinfo *mtu_info; | |
289 | ||
290 | if (!np->rxopt.bits.rxpmtu) | |
291 | return; | |
292 | ||
293 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
294 | if (!skb) | |
295 | return; | |
296 | ||
297 | skb_put(skb, sizeof(struct ipv6hdr)); | |
298 | skb_reset_network_header(skb); | |
299 | iph = ipv6_hdr(skb); | |
4e3fd7a0 | 300 | iph->daddr = fl6->daddr; |
4b340ae2 BH |
301 | |
302 | mtu_info = IP6CBMTU(skb); | |
4b340ae2 BH |
303 | |
304 | mtu_info->ip6m_mtu = mtu; | |
305 | mtu_info->ip6m_addr.sin6_family = AF_INET6; | |
306 | mtu_info->ip6m_addr.sin6_port = 0; | |
307 | mtu_info->ip6m_addr.sin6_flowinfo = 0; | |
4c9483b2 | 308 | mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
4e3fd7a0 | 309 | mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; |
4b340ae2 BH |
310 | |
311 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); | |
312 | skb_reset_transport_header(skb); | |
313 | ||
314 | skb = xchg(&np->rxpmtu, skb); | |
315 | kfree_skb(skb); | |
316 | } | |
317 | ||
1ab1457c | 318 | /* |
1da177e4 LT |
319 | * Handle MSG_ERRQUEUE |
320 | */ | |
321 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
322 | { | |
323 | struct ipv6_pinfo *np = inet6_sk(sk); | |
324 | struct sock_exterr_skb *serr; | |
325 | struct sk_buff *skb, *skb2; | |
326 | struct sockaddr_in6 *sin; | |
327 | struct { | |
328 | struct sock_extended_err ee; | |
329 | struct sockaddr_in6 offender; | |
330 | } errhdr; | |
331 | int err; | |
332 | int copied; | |
333 | ||
334 | err = -EAGAIN; | |
335 | skb = skb_dequeue(&sk->sk_error_queue); | |
336 | if (skb == NULL) | |
337 | goto out; | |
338 | ||
339 | copied = skb->len; | |
340 | if (copied > len) { | |
341 | msg->msg_flags |= MSG_TRUNC; | |
342 | copied = len; | |
343 | } | |
344 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
345 | if (err) | |
346 | goto out_free_skb; | |
347 | ||
348 | sock_recv_timestamp(msg, sk, skb); | |
349 | ||
350 | serr = SKB_EXT_ERR(skb); | |
351 | ||
352 | sin = (struct sockaddr_in6 *)msg->msg_name; | |
353 | if (sin) { | |
d56f90a7 | 354 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
355 | sin->sin6_family = AF_INET6; |
356 | sin->sin6_flowinfo = 0; | |
1ab1457c | 357 | sin->sin6_port = serr->port; |
1da177e4 | 358 | sin->sin6_scope_id = 0; |
d40a4de0 | 359 | if (skb->protocol == htons(ETH_P_IPV6)) { |
6c40d100 YH |
360 | const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), |
361 | struct ipv6hdr, daddr); | |
362 | sin->sin6_addr = ip6h->daddr; | |
1da177e4 | 363 | if (np->sndflow) |
6502ca52 | 364 | sin->sin6_flowinfo = ip6_flowinfo(ip6h); |
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) { |
e7219858 | 492 | int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
41a1f8ea YH |
493 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
494 | } | |
495 | ||
6502ca52 YH |
496 | if (np->rxopt.bits.rxflow) { |
497 | __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); | |
498 | if (flowinfo) | |
499 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); | |
1da177e4 | 500 | } |
333fad53 YH |
501 | |
502 | /* HbH is allowed only once */ | |
1da177e4 | 503 | if (np->rxopt.bits.hopopts && opt->hop) { |
d56f90a7 | 504 | u8 *ptr = nh + opt->hop; |
1da177e4 LT |
505 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
506 | } | |
333fad53 YH |
507 | |
508 | if (opt->lastopt && | |
509 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { | |
510 | /* | |
511 | * Silly enough, but we need to reparse in order to | |
512 | * report extension headers (except for HbH) | |
513 | * in order. | |
514 | * | |
1ab1457c | 515 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
333fad53 YH |
516 | * (and WILL NOT be) defined because |
517 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji | |
518 | */ | |
519 | unsigned int off = sizeof(struct ipv6hdr); | |
0660e03f | 520 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
333fad53 YH |
521 | |
522 | while (off <= opt->lastopt) { | |
95c96174 | 523 | unsigned int len; |
d56f90a7 | 524 | u8 *ptr = nh + off; |
333fad53 | 525 | |
b5a4257c | 526 | switch (nexthdr) { |
333fad53 YH |
527 | case IPPROTO_DSTOPTS: |
528 | nexthdr = ptr[0]; | |
529 | len = (ptr[1] + 1) << 3; | |
530 | if (np->rxopt.bits.dstopts) | |
531 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); | |
532 | break; | |
533 | case IPPROTO_ROUTING: | |
534 | nexthdr = ptr[0]; | |
535 | len = (ptr[1] + 1) << 3; | |
536 | if (np->rxopt.bits.srcrt) | |
537 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); | |
538 | break; | |
539 | case IPPROTO_AH: | |
540 | nexthdr = ptr[0]; | |
a3059893 | 541 | len = (ptr[1] + 2) << 2; |
333fad53 YH |
542 | break; |
543 | default: | |
544 | nexthdr = ptr[0]; | |
545 | len = (ptr[1] + 1) << 3; | |
546 | break; | |
547 | } | |
548 | ||
549 | off += len; | |
550 | } | |
551 | } | |
552 | ||
553 | /* socket options in old style */ | |
554 | if (np->rxopt.bits.rxoinfo) { | |
555 | struct in6_pktinfo src_info; | |
556 | ||
557 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 558 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
333fad53 YH |
559 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
560 | } | |
561 | if (np->rxopt.bits.rxohlim) { | |
0660e03f | 562 | int hlim = ipv6_hdr(skb)->hop_limit; |
333fad53 YH |
563 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
564 | } | |
565 | if (np->rxopt.bits.ohopopts && opt->hop) { | |
d56f90a7 | 566 | u8 *ptr = nh + opt->hop; |
333fad53 YH |
567 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
568 | } | |
569 | if (np->rxopt.bits.odstopts && opt->dst0) { | |
d56f90a7 | 570 | u8 *ptr = nh + opt->dst0; |
333fad53 | 571 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 572 | } |
333fad53 | 573 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
d56f90a7 | 574 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
333fad53 | 575 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
1da177e4 | 576 | } |
333fad53 | 577 | if (np->rxopt.bits.odstopts && opt->dst1) { |
d56f90a7 | 578 | u8 *ptr = nh + opt->dst1; |
333fad53 | 579 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 580 | } |
6c468622 BS |
581 | if (np->rxopt.bits.rxorigdstaddr) { |
582 | struct sockaddr_in6 sin6; | |
747465ef | 583 | __be16 *ports = (__be16 *) skb_transport_header(skb); |
6c468622 BS |
584 | |
585 | if (skb_transport_offset(skb) + 4 <= skb->len) { | |
586 | /* All current transport protocols have the port numbers in the | |
587 | * first four bytes of the transport header and this function is | |
588 | * written with this assumption in mind. | |
589 | */ | |
590 | ||
591 | sin6.sin6_family = AF_INET6; | |
4e3fd7a0 | 592 | sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
6c468622 BS |
593 | sin6.sin6_port = ports[1]; |
594 | sin6.sin6_flowinfo = 0; | |
595 | sin6.sin6_scope_id = 0; | |
596 | ||
597 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); | |
598 | } | |
599 | } | |
1da177e4 LT |
600 | return 0; |
601 | } | |
8e72d37e | 602 | EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
1da177e4 | 603 | |
73df66f8 TP |
604 | int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
605 | struct msghdr *msg, struct flowi6 *fl6, | |
606 | struct ipv6_txoptions *opt, | |
607 | int *hlimit, int *tclass, int *dontfrag) | |
1da177e4 LT |
608 | { |
609 | struct in6_pktinfo *src_info; | |
610 | struct cmsghdr *cmsg; | |
611 | struct ipv6_rt_hdr *rthdr; | |
612 | struct ipv6_opt_hdr *hdr; | |
613 | int len; | |
614 | int err = 0; | |
615 | ||
616 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
617 | int addr_type; | |
1da177e4 LT |
618 | |
619 | if (!CMSG_OK(msg, cmsg)) { | |
620 | err = -EINVAL; | |
621 | goto exit_f; | |
622 | } | |
623 | ||
624 | if (cmsg->cmsg_level != SOL_IPV6) | |
625 | continue; | |
626 | ||
627 | switch (cmsg->cmsg_type) { | |
1ab1457c YH |
628 | case IPV6_PKTINFO: |
629 | case IPV6_2292PKTINFO: | |
187e3838 YH |
630 | { |
631 | struct net_device *dev = NULL; | |
632 | ||
1ab1457c | 633 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
1da177e4 LT |
634 | err = -EINVAL; |
635 | goto exit_f; | |
636 | } | |
637 | ||
638 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
1ab1457c | 639 | |
1da177e4 | 640 | if (src_info->ipi6_ifindex) { |
4c9483b2 DM |
641 | if (fl6->flowi6_oif && |
642 | src_info->ipi6_ifindex != fl6->flowi6_oif) | |
1da177e4 | 643 | return -EINVAL; |
4c9483b2 | 644 | fl6->flowi6_oif = src_info->ipi6_ifindex; |
1da177e4 LT |
645 | } |
646 | ||
187e3838 | 647 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
1da177e4 | 648 | |
536b2e92 | 649 | rcu_read_lock(); |
4c9483b2 DM |
650 | if (fl6->flowi6_oif) { |
651 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
536b2e92 ED |
652 | if (!dev) { |
653 | rcu_read_unlock(); | |
187e3838 | 654 | return -ENODEV; |
536b2e92 ED |
655 | } |
656 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
657 | rcu_read_unlock(); | |
187e3838 | 658 | return -EINVAL; |
536b2e92 | 659 | } |
1ab1457c | 660 | |
187e3838 YH |
661 | if (addr_type != IPV6_ADDR_ANY) { |
662 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; | |
2563fa59 | 663 | if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && |
ec0506db | 664 | !ipv6_chk_addr(net, &src_info->ipi6_addr, |
187e3838 YH |
665 | strict ? dev : NULL, 0)) |
666 | err = -EINVAL; | |
667 | else | |
4e3fd7a0 | 668 | fl6->saddr = src_info->ipi6_addr; |
1da177e4 | 669 | } |
187e3838 | 670 | |
536b2e92 | 671 | rcu_read_unlock(); |
1da177e4 | 672 | |
187e3838 YH |
673 | if (err) |
674 | goto exit_f; | |
675 | ||
1da177e4 | 676 | break; |
187e3838 | 677 | } |
1da177e4 LT |
678 | |
679 | case IPV6_FLOWINFO: | |
1ab1457c | 680 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
1da177e4 LT |
681 | err = -EINVAL; |
682 | goto exit_f; | |
683 | } | |
684 | ||
4c9483b2 DM |
685 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
686 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { | |
1da177e4 LT |
687 | err = -EINVAL; |
688 | goto exit_f; | |
689 | } | |
690 | } | |
4c9483b2 | 691 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
1da177e4 LT |
692 | break; |
693 | ||
333fad53 | 694 | case IPV6_2292HOPOPTS: |
1da177e4 | 695 | case IPV6_HOPOPTS: |
1ab1457c | 696 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
697 | err = -EINVAL; |
698 | goto exit_f; | |
699 | } | |
700 | ||
701 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
702 | len = ((hdr->hdrlen + 1) << 3); | |
703 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
704 | err = -EINVAL; | |
705 | goto exit_f; | |
706 | } | |
af31f412 | 707 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
708 | err = -EPERM; |
709 | goto exit_f; | |
710 | } | |
711 | opt->opt_nflen += len; | |
712 | opt->hopopt = hdr; | |
713 | break; | |
714 | ||
333fad53 | 715 | case IPV6_2292DSTOPTS: |
1ab1457c | 716 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
717 | err = -EINVAL; |
718 | goto exit_f; | |
719 | } | |
720 | ||
721 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
722 | len = ((hdr->hdrlen + 1) << 3); | |
723 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
724 | err = -EINVAL; | |
725 | goto exit_f; | |
726 | } | |
af31f412 | 727 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
728 | err = -EPERM; |
729 | goto exit_f; | |
730 | } | |
731 | if (opt->dst1opt) { | |
732 | err = -EINVAL; | |
733 | goto exit_f; | |
734 | } | |
735 | opt->opt_flen += len; | |
736 | opt->dst1opt = hdr; | |
737 | break; | |
738 | ||
333fad53 YH |
739 | case IPV6_DSTOPTS: |
740 | case IPV6_RTHDRDSTOPTS: | |
741 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
742 | err = -EINVAL; | |
743 | goto exit_f; | |
744 | } | |
745 | ||
746 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
747 | len = ((hdr->hdrlen + 1) << 3); | |
748 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
749 | err = -EINVAL; | |
750 | goto exit_f; | |
751 | } | |
af31f412 | 752 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
333fad53 YH |
753 | err = -EPERM; |
754 | goto exit_f; | |
755 | } | |
756 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { | |
757 | opt->opt_flen += len; | |
758 | opt->dst1opt = hdr; | |
759 | } else { | |
760 | opt->opt_nflen += len; | |
761 | opt->dst0opt = hdr; | |
762 | } | |
763 | break; | |
764 | ||
765 | case IPV6_2292RTHDR: | |
1da177e4 | 766 | case IPV6_RTHDR: |
1ab1457c | 767 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
1da177e4 LT |
768 | err = -EINVAL; |
769 | goto exit_f; | |
770 | } | |
771 | ||
772 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
773 | ||
280a9d34 | 774 | switch (rthdr->type) { |
07a93626 | 775 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
280a9d34 | 776 | case IPV6_SRCRT_TYPE_2: |
6e093d9d BH |
777 | if (rthdr->hdrlen != 2 || |
778 | rthdr->segments_left != 1) { | |
779 | err = -EINVAL; | |
780 | goto exit_f; | |
781 | } | |
280a9d34 | 782 | break; |
bb4dbf9e | 783 | #endif |
280a9d34 | 784 | default: |
1da177e4 LT |
785 | err = -EINVAL; |
786 | goto exit_f; | |
787 | } | |
788 | ||
789 | len = ((rthdr->hdrlen + 1) << 3); | |
790 | ||
1ab1457c | 791 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
1da177e4 LT |
792 | err = -EINVAL; |
793 | goto exit_f; | |
794 | } | |
795 | ||
796 | /* segments left must also match */ | |
797 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
798 | err = -EINVAL; | |
799 | goto exit_f; | |
800 | } | |
801 | ||
802 | opt->opt_nflen += len; | |
803 | opt->srcrt = rthdr; | |
804 | ||
333fad53 | 805 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
1da177e4 LT |
806 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
807 | ||
808 | opt->opt_nflen += dsthdrlen; | |
809 | opt->dst0opt = opt->dst1opt; | |
810 | opt->dst1opt = NULL; | |
811 | opt->opt_flen -= dsthdrlen; | |
812 | } | |
813 | ||
814 | break; | |
815 | ||
333fad53 | 816 | case IPV6_2292HOPLIMIT: |
1da177e4 LT |
817 | case IPV6_HOPLIMIT: |
818 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
819 | err = -EINVAL; | |
820 | goto exit_f; | |
821 | } | |
822 | ||
823 | *hlimit = *(int *)CMSG_DATA(cmsg); | |
e8766fc8 SW |
824 | if (*hlimit < -1 || *hlimit > 0xff) { |
825 | err = -EINVAL; | |
826 | goto exit_f; | |
827 | } | |
828 | ||
1da177e4 LT |
829 | break; |
830 | ||
41a1f8ea YH |
831 | case IPV6_TCLASS: |
832 | { | |
833 | int tc; | |
834 | ||
835 | err = -EINVAL; | |
b5a4257c | 836 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
41a1f8ea | 837 | goto exit_f; |
41a1f8ea YH |
838 | |
839 | tc = *(int *)CMSG_DATA(cmsg); | |
d0ee011f | 840 | if (tc < -1 || tc > 0xff) |
41a1f8ea YH |
841 | goto exit_f; |
842 | ||
843 | err = 0; | |
844 | *tclass = tc; | |
845 | ||
13b52cd4 BH |
846 | break; |
847 | } | |
848 | ||
849 | case IPV6_DONTFRAG: | |
850 | { | |
851 | int df; | |
852 | ||
853 | err = -EINVAL; | |
b5a4257c | 854 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
13b52cd4 | 855 | goto exit_f; |
13b52cd4 BH |
856 | |
857 | df = *(int *)CMSG_DATA(cmsg); | |
858 | if (df < 0 || df > 1) | |
859 | goto exit_f; | |
860 | ||
861 | err = 0; | |
862 | *dontfrag = df; | |
863 | ||
41a1f8ea YH |
864 | break; |
865 | } | |
1da177e4 | 866 | default: |
64ce2073 | 867 | LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", |
1ab1457c | 868 | cmsg->cmsg_type); |
1da177e4 | 869 | err = -EINVAL; |
4a36702e | 870 | goto exit_f; |
3ff50b79 | 871 | } |
1da177e4 LT |
872 | } |
873 | ||
874 | exit_f: | |
875 | return err; | |
876 | } | |
73df66f8 | 877 | EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |