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 | |
efe4208f | 110 | ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_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 | |
efe4208f ED |
116 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || |
117 | ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { | |
c720c7e8 | 118 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
efe4208f | 119 | &sk->sk_v6_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 | ||
842df073 | 127 | if (__ipv6_addr_needs_scope_id(addr_type)) { |
1da177e4 LT |
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 | ||
efe4208f | 148 | sk->sk_v6_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; |
efe4208f | 159 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 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 | 185 | |
efe4208f ED |
186 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
187 | sk->sk_v6_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, | |
efe4208f ED |
194 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
195 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 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; |
d40a4de0 | 358 | if (skb->protocol == htons(ETH_P_IPV6)) { |
6c40d100 YH |
359 | const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), |
360 | struct ipv6hdr, daddr); | |
361 | sin->sin6_addr = ip6h->daddr; | |
1da177e4 | 362 | if (np->sndflow) |
6502ca52 | 363 | sin->sin6_flowinfo = ip6_flowinfo(ip6h); |
842df073 HFS |
364 | sin->sin6_scope_id = |
365 | ipv6_iface_scope_id(&sin->sin6_addr, | |
366 | IP6CB(skb)->iif); | |
1da177e4 | 367 | } else { |
b301e82c BH |
368 | ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
369 | &sin->sin6_addr); | |
842df073 | 370 | sin->sin6_scope_id = 0; |
1da177e4 LT |
371 | } |
372 | } | |
373 | ||
374 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
375 | sin = &errhdr.offender; | |
376 | sin->sin6_family = AF_UNSPEC; | |
377 | if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { | |
378 | sin->sin6_family = AF_INET6; | |
379 | sin->sin6_flowinfo = 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); |
842df073 HFS |
384 | sin->sin6_scope_id = |
385 | ipv6_iface_scope_id(&sin->sin6_addr, | |
386 | IP6CB(skb)->iif); | |
1da177e4 LT |
387 | } else { |
388 | struct inet_sock *inet = inet_sk(sk); | |
389 | ||
b301e82c BH |
390 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
391 | &sin->sin6_addr); | |
842df073 | 392 | sin->sin6_scope_id = 0; |
1da177e4 LT |
393 | if (inet->cmsg_flags) |
394 | ip_cmsg_recv(msg, skb); | |
395 | } | |
396 | } | |
397 | ||
398 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); | |
399 | ||
400 | /* Now we could try to dump offended packet options */ | |
401 | ||
402 | msg->msg_flags |= MSG_ERRQUEUE; | |
403 | err = copied; | |
404 | ||
405 | /* Reset and regenerate socket error */ | |
e0f9f858 | 406 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
407 | sk->sk_err = 0; |
408 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
409 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
e0f9f858 | 410 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
411 | sk->sk_error_report(sk); |
412 | } else { | |
e0f9f858 | 413 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
414 | } |
415 | ||
1ab1457c | 416 | out_free_skb: |
1da177e4 LT |
417 | kfree_skb(skb); |
418 | out: | |
419 | return err; | |
420 | } | |
a495f836 | 421 | EXPORT_SYMBOL_GPL(ipv6_recv_error); |
1da177e4 | 422 | |
4b340ae2 BH |
423 | /* |
424 | * Handle IPV6_RECVPATHMTU | |
425 | */ | |
426 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len) | |
427 | { | |
428 | struct ipv6_pinfo *np = inet6_sk(sk); | |
429 | struct sk_buff *skb; | |
430 | struct sockaddr_in6 *sin; | |
431 | struct ip6_mtuinfo mtu_info; | |
432 | int err; | |
433 | int copied; | |
434 | ||
435 | err = -EAGAIN; | |
436 | skb = xchg(&np->rxpmtu, NULL); | |
437 | if (skb == NULL) | |
438 | goto out; | |
439 | ||
440 | copied = skb->len; | |
441 | if (copied > len) { | |
442 | msg->msg_flags |= MSG_TRUNC; | |
443 | copied = len; | |
444 | } | |
445 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
446 | if (err) | |
447 | goto out_free_skb; | |
448 | ||
449 | sock_recv_timestamp(msg, sk, skb); | |
450 | ||
451 | memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); | |
452 | ||
453 | sin = (struct sockaddr_in6 *)msg->msg_name; | |
454 | if (sin) { | |
455 | sin->sin6_family = AF_INET6; | |
456 | sin->sin6_flowinfo = 0; | |
457 | sin->sin6_port = 0; | |
458 | sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; | |
4e3fd7a0 | 459 | sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; |
4b340ae2 BH |
460 | } |
461 | ||
462 | put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); | |
463 | ||
464 | err = copied; | |
465 | ||
466 | out_free_skb: | |
467 | kfree_skb(skb); | |
468 | out: | |
469 | return err; | |
470 | } | |
1da177e4 LT |
471 | |
472 | ||
73df66f8 TP |
473 | int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, |
474 | struct sk_buff *skb) | |
1da177e4 LT |
475 | { |
476 | struct ipv6_pinfo *np = inet6_sk(sk); | |
477 | struct inet6_skb_parm *opt = IP6CB(skb); | |
d56f90a7 | 478 | unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
479 | |
480 | if (np->rxopt.bits.rxinfo) { | |
481 | struct in6_pktinfo src_info; | |
482 | ||
483 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 484 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
1da177e4 LT |
485 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); |
486 | } | |
487 | ||
488 | if (np->rxopt.bits.rxhlim) { | |
0660e03f | 489 | int hlim = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
490 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
491 | } | |
492 | ||
41a1f8ea | 493 | if (np->rxopt.bits.rxtclass) { |
e7219858 | 494 | int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
41a1f8ea YH |
495 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
496 | } | |
497 | ||
6502ca52 YH |
498 | if (np->rxopt.bits.rxflow) { |
499 | __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); | |
500 | if (flowinfo) | |
501 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); | |
1da177e4 | 502 | } |
333fad53 YH |
503 | |
504 | /* HbH is allowed only once */ | |
1da177e4 | 505 | if (np->rxopt.bits.hopopts && opt->hop) { |
d56f90a7 | 506 | u8 *ptr = nh + opt->hop; |
1da177e4 LT |
507 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
508 | } | |
333fad53 YH |
509 | |
510 | if (opt->lastopt && | |
511 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { | |
512 | /* | |
513 | * Silly enough, but we need to reparse in order to | |
514 | * report extension headers (except for HbH) | |
515 | * in order. | |
516 | * | |
1ab1457c | 517 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
333fad53 YH |
518 | * (and WILL NOT be) defined because |
519 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji | |
520 | */ | |
521 | unsigned int off = sizeof(struct ipv6hdr); | |
0660e03f | 522 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
333fad53 YH |
523 | |
524 | while (off <= opt->lastopt) { | |
95c96174 | 525 | unsigned int len; |
d56f90a7 | 526 | u8 *ptr = nh + off; |
333fad53 | 527 | |
b5a4257c | 528 | switch (nexthdr) { |
333fad53 YH |
529 | case IPPROTO_DSTOPTS: |
530 | nexthdr = ptr[0]; | |
531 | len = (ptr[1] + 1) << 3; | |
532 | if (np->rxopt.bits.dstopts) | |
533 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); | |
534 | break; | |
535 | case IPPROTO_ROUTING: | |
536 | nexthdr = ptr[0]; | |
537 | len = (ptr[1] + 1) << 3; | |
538 | if (np->rxopt.bits.srcrt) | |
539 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); | |
540 | break; | |
541 | case IPPROTO_AH: | |
542 | nexthdr = ptr[0]; | |
a3059893 | 543 | len = (ptr[1] + 2) << 2; |
333fad53 YH |
544 | break; |
545 | default: | |
546 | nexthdr = ptr[0]; | |
547 | len = (ptr[1] + 1) << 3; | |
548 | break; | |
549 | } | |
550 | ||
551 | off += len; | |
552 | } | |
553 | } | |
554 | ||
555 | /* socket options in old style */ | |
556 | if (np->rxopt.bits.rxoinfo) { | |
557 | struct in6_pktinfo src_info; | |
558 | ||
559 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 560 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
333fad53 YH |
561 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
562 | } | |
563 | if (np->rxopt.bits.rxohlim) { | |
0660e03f | 564 | int hlim = ipv6_hdr(skb)->hop_limit; |
333fad53 YH |
565 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
566 | } | |
567 | if (np->rxopt.bits.ohopopts && opt->hop) { | |
d56f90a7 | 568 | u8 *ptr = nh + opt->hop; |
333fad53 YH |
569 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
570 | } | |
571 | if (np->rxopt.bits.odstopts && opt->dst0) { | |
d56f90a7 | 572 | u8 *ptr = nh + opt->dst0; |
333fad53 | 573 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 574 | } |
333fad53 | 575 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
d56f90a7 | 576 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
333fad53 | 577 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
1da177e4 | 578 | } |
333fad53 | 579 | if (np->rxopt.bits.odstopts && opt->dst1) { |
d56f90a7 | 580 | u8 *ptr = nh + opt->dst1; |
333fad53 | 581 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 582 | } |
6c468622 BS |
583 | if (np->rxopt.bits.rxorigdstaddr) { |
584 | struct sockaddr_in6 sin6; | |
747465ef | 585 | __be16 *ports = (__be16 *) skb_transport_header(skb); |
6c468622 BS |
586 | |
587 | if (skb_transport_offset(skb) + 4 <= skb->len) { | |
588 | /* All current transport protocols have the port numbers in the | |
589 | * first four bytes of the transport header and this function is | |
590 | * written with this assumption in mind. | |
591 | */ | |
592 | ||
593 | sin6.sin6_family = AF_INET6; | |
4e3fd7a0 | 594 | sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
6c468622 BS |
595 | sin6.sin6_port = ports[1]; |
596 | sin6.sin6_flowinfo = 0; | |
3868b7aa HFS |
597 | sin6.sin6_scope_id = |
598 | ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, | |
599 | opt->iif); | |
6c468622 BS |
600 | |
601 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); | |
602 | } | |
603 | } | |
1da177e4 LT |
604 | return 0; |
605 | } | |
8e72d37e | 606 | EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
1da177e4 | 607 | |
73df66f8 TP |
608 | int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
609 | struct msghdr *msg, struct flowi6 *fl6, | |
610 | struct ipv6_txoptions *opt, | |
611 | int *hlimit, int *tclass, int *dontfrag) | |
1da177e4 LT |
612 | { |
613 | struct in6_pktinfo *src_info; | |
614 | struct cmsghdr *cmsg; | |
615 | struct ipv6_rt_hdr *rthdr; | |
616 | struct ipv6_opt_hdr *hdr; | |
617 | int len; | |
618 | int err = 0; | |
619 | ||
620 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
621 | int addr_type; | |
1da177e4 LT |
622 | |
623 | if (!CMSG_OK(msg, cmsg)) { | |
624 | err = -EINVAL; | |
625 | goto exit_f; | |
626 | } | |
627 | ||
628 | if (cmsg->cmsg_level != SOL_IPV6) | |
629 | continue; | |
630 | ||
631 | switch (cmsg->cmsg_type) { | |
1ab1457c YH |
632 | case IPV6_PKTINFO: |
633 | case IPV6_2292PKTINFO: | |
187e3838 YH |
634 | { |
635 | struct net_device *dev = NULL; | |
636 | ||
1ab1457c | 637 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
1da177e4 LT |
638 | err = -EINVAL; |
639 | goto exit_f; | |
640 | } | |
641 | ||
642 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
1ab1457c | 643 | |
1da177e4 | 644 | if (src_info->ipi6_ifindex) { |
4c9483b2 DM |
645 | if (fl6->flowi6_oif && |
646 | src_info->ipi6_ifindex != fl6->flowi6_oif) | |
1da177e4 | 647 | return -EINVAL; |
4c9483b2 | 648 | fl6->flowi6_oif = src_info->ipi6_ifindex; |
1da177e4 LT |
649 | } |
650 | ||
187e3838 | 651 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
1da177e4 | 652 | |
536b2e92 | 653 | rcu_read_lock(); |
4c9483b2 DM |
654 | if (fl6->flowi6_oif) { |
655 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
536b2e92 ED |
656 | if (!dev) { |
657 | rcu_read_unlock(); | |
187e3838 | 658 | return -ENODEV; |
536b2e92 ED |
659 | } |
660 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
661 | rcu_read_unlock(); | |
187e3838 | 662 | return -EINVAL; |
536b2e92 | 663 | } |
1ab1457c | 664 | |
187e3838 YH |
665 | if (addr_type != IPV6_ADDR_ANY) { |
666 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; | |
2563fa59 | 667 | if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && |
ec0506db | 668 | !ipv6_chk_addr(net, &src_info->ipi6_addr, |
187e3838 YH |
669 | strict ? dev : NULL, 0)) |
670 | err = -EINVAL; | |
671 | else | |
4e3fd7a0 | 672 | fl6->saddr = src_info->ipi6_addr; |
1da177e4 | 673 | } |
187e3838 | 674 | |
536b2e92 | 675 | rcu_read_unlock(); |
1da177e4 | 676 | |
187e3838 YH |
677 | if (err) |
678 | goto exit_f; | |
679 | ||
1da177e4 | 680 | break; |
187e3838 | 681 | } |
1da177e4 LT |
682 | |
683 | case IPV6_FLOWINFO: | |
1ab1457c | 684 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
1da177e4 LT |
685 | err = -EINVAL; |
686 | goto exit_f; | |
687 | } | |
688 | ||
4c9483b2 DM |
689 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
690 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { | |
1da177e4 LT |
691 | err = -EINVAL; |
692 | goto exit_f; | |
693 | } | |
694 | } | |
4c9483b2 | 695 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
1da177e4 LT |
696 | break; |
697 | ||
333fad53 | 698 | case IPV6_2292HOPOPTS: |
1da177e4 | 699 | case IPV6_HOPOPTS: |
1ab1457c | 700 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
701 | err = -EINVAL; |
702 | goto exit_f; | |
703 | } | |
704 | ||
705 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
706 | len = ((hdr->hdrlen + 1) << 3); | |
707 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
708 | err = -EINVAL; | |
709 | goto exit_f; | |
710 | } | |
af31f412 | 711 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
712 | err = -EPERM; |
713 | goto exit_f; | |
714 | } | |
715 | opt->opt_nflen += len; | |
716 | opt->hopopt = hdr; | |
717 | break; | |
718 | ||
333fad53 | 719 | case IPV6_2292DSTOPTS: |
1ab1457c | 720 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
721 | err = -EINVAL; |
722 | goto exit_f; | |
723 | } | |
724 | ||
725 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
726 | len = ((hdr->hdrlen + 1) << 3); | |
727 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
728 | err = -EINVAL; | |
729 | goto exit_f; | |
730 | } | |
af31f412 | 731 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
732 | err = -EPERM; |
733 | goto exit_f; | |
734 | } | |
735 | if (opt->dst1opt) { | |
736 | err = -EINVAL; | |
737 | goto exit_f; | |
738 | } | |
739 | opt->opt_flen += len; | |
740 | opt->dst1opt = hdr; | |
741 | break; | |
742 | ||
333fad53 YH |
743 | case IPV6_DSTOPTS: |
744 | case IPV6_RTHDRDSTOPTS: | |
745 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
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)) { |
333fad53 YH |
757 | err = -EPERM; |
758 | goto exit_f; | |
759 | } | |
760 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { | |
761 | opt->opt_flen += len; | |
762 | opt->dst1opt = hdr; | |
763 | } else { | |
764 | opt->opt_nflen += len; | |
765 | opt->dst0opt = hdr; | |
766 | } | |
767 | break; | |
768 | ||
769 | case IPV6_2292RTHDR: | |
1da177e4 | 770 | case IPV6_RTHDR: |
1ab1457c | 771 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
1da177e4 LT |
772 | err = -EINVAL; |
773 | goto exit_f; | |
774 | } | |
775 | ||
776 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
777 | ||
280a9d34 | 778 | switch (rthdr->type) { |
07a93626 | 779 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
280a9d34 | 780 | case IPV6_SRCRT_TYPE_2: |
6e093d9d BH |
781 | if (rthdr->hdrlen != 2 || |
782 | rthdr->segments_left != 1) { | |
783 | err = -EINVAL; | |
784 | goto exit_f; | |
785 | } | |
280a9d34 | 786 | break; |
bb4dbf9e | 787 | #endif |
280a9d34 | 788 | default: |
1da177e4 LT |
789 | err = -EINVAL; |
790 | goto exit_f; | |
791 | } | |
792 | ||
793 | len = ((rthdr->hdrlen + 1) << 3); | |
794 | ||
1ab1457c | 795 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
1da177e4 LT |
796 | err = -EINVAL; |
797 | goto exit_f; | |
798 | } | |
799 | ||
800 | /* segments left must also match */ | |
801 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
802 | err = -EINVAL; | |
803 | goto exit_f; | |
804 | } | |
805 | ||
806 | opt->opt_nflen += len; | |
807 | opt->srcrt = rthdr; | |
808 | ||
333fad53 | 809 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
1da177e4 LT |
810 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
811 | ||
812 | opt->opt_nflen += dsthdrlen; | |
813 | opt->dst0opt = opt->dst1opt; | |
814 | opt->dst1opt = NULL; | |
815 | opt->opt_flen -= dsthdrlen; | |
816 | } | |
817 | ||
818 | break; | |
819 | ||
333fad53 | 820 | case IPV6_2292HOPLIMIT: |
1da177e4 LT |
821 | case IPV6_HOPLIMIT: |
822 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
823 | err = -EINVAL; | |
824 | goto exit_f; | |
825 | } | |
826 | ||
827 | *hlimit = *(int *)CMSG_DATA(cmsg); | |
e8766fc8 SW |
828 | if (*hlimit < -1 || *hlimit > 0xff) { |
829 | err = -EINVAL; | |
830 | goto exit_f; | |
831 | } | |
832 | ||
1da177e4 LT |
833 | break; |
834 | ||
41a1f8ea YH |
835 | case IPV6_TCLASS: |
836 | { | |
837 | int tc; | |
838 | ||
839 | err = -EINVAL; | |
b5a4257c | 840 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
41a1f8ea | 841 | goto exit_f; |
41a1f8ea YH |
842 | |
843 | tc = *(int *)CMSG_DATA(cmsg); | |
d0ee011f | 844 | if (tc < -1 || tc > 0xff) |
41a1f8ea YH |
845 | goto exit_f; |
846 | ||
847 | err = 0; | |
848 | *tclass = tc; | |
849 | ||
13b52cd4 BH |
850 | break; |
851 | } | |
852 | ||
853 | case IPV6_DONTFRAG: | |
854 | { | |
855 | int df; | |
856 | ||
857 | err = -EINVAL; | |
b5a4257c | 858 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
13b52cd4 | 859 | goto exit_f; |
13b52cd4 BH |
860 | |
861 | df = *(int *)CMSG_DATA(cmsg); | |
862 | if (df < 0 || df > 1) | |
863 | goto exit_f; | |
864 | ||
865 | err = 0; | |
866 | *dontfrag = df; | |
867 | ||
41a1f8ea YH |
868 | break; |
869 | } | |
1da177e4 | 870 | default: |
64ce2073 | 871 | LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", |
1ab1457c | 872 | cmsg->cmsg_type); |
1da177e4 | 873 | err = -EINVAL; |
4a36702e | 874 | goto exit_f; |
3ff50b79 | 875 | } |
1da177e4 LT |
876 | } |
877 | ||
878 | exit_f: | |
879 | return err; | |
880 | } | |
73df66f8 | 881 | EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |
17ef66af LC |
882 | |
883 | void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, | |
884 | __u16 srcp, __u16 destp, int bucket) | |
885 | { | |
17ef66af LC |
886 | const struct in6_addr *dest, *src; |
887 | ||
efe4208f ED |
888 | dest = &sp->sk_v6_daddr; |
889 | src = &sp->sk_v6_rcv_saddr; | |
17ef66af LC |
890 | seq_printf(seq, |
891 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 892 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", |
17ef66af LC |
893 | bucket, |
894 | src->s6_addr32[0], src->s6_addr32[1], | |
895 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
896 | dest->s6_addr32[0], dest->s6_addr32[1], | |
897 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
898 | sp->sk_state, | |
899 | sk_wmem_alloc_get(sp), | |
900 | sk_rmem_alloc_get(sp), | |
901 | 0, 0L, 0, | |
902 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), | |
903 | 0, | |
904 | sock_i_ino(sp), | |
905 | atomic_read(&sp->sk_refcnt), sp, | |
906 | atomic_read(&sp->sk_drops)); | |
907 | } |