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Commit | Line | Data |
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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 LT |
7 | * |
8 | * $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
4fc268d2 | 16 | #include <linux/capability.h> |
1da177e4 LT |
17 | #include <linux/errno.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
1da177e4 LT |
20 | #include <linux/interrupt.h> |
21 | #include <linux/socket.h> | |
22 | #include <linux/sockios.h> | |
23 | #include <linux/in6.h> | |
24 | #include <linux/ipv6.h> | |
25 | #include <linux/route.h> | |
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 | ||
37 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
38 | { | |
39 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
40 | struct inet_sock *inet = inet_sk(sk); | |
41 | struct ipv6_pinfo *np = inet6_sk(sk); | |
42 | struct in6_addr *daddr, *final_p = NULL, final; | |
43 | struct dst_entry *dst; | |
44 | struct flowi fl; | |
45 | struct ip6_flowlabel *flowlabel = NULL; | |
46 | int addr_type; | |
47 | int err; | |
48 | ||
49 | if (usin->sin6_family == AF_INET) { | |
50 | if (__ipv6_only_sock(sk)) | |
51 | return -EAFNOSUPPORT; | |
52 | err = ip4_datagram_connect(sk, uaddr, addr_len); | |
53 | goto ipv4_connected; | |
54 | } | |
55 | ||
56 | if (addr_len < SIN6_LEN_RFC2133) | |
1ab1457c | 57 | return -EINVAL; |
1da177e4 | 58 | |
1ab1457c YH |
59 | if (usin->sin6_family != AF_INET6) |
60 | return -EAFNOSUPPORT; | |
1da177e4 LT |
61 | |
62 | memset(&fl, 0, sizeof(fl)); | |
63 | if (np->sndflow) { | |
64 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
65 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
66 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
67 | if (flowlabel == NULL) | |
68 | return -EINVAL; | |
69 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
70 | } | |
71 | } | |
72 | ||
73 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
74 | ||
75 | if (addr_type == IPV6_ADDR_ANY) { | |
76 | /* | |
77 | * connect to self | |
78 | */ | |
79 | usin->sin6_addr.s6_addr[15] = 0x01; | |
80 | } | |
81 | ||
82 | daddr = &usin->sin6_addr; | |
83 | ||
84 | if (addr_type == IPV6_ADDR_MAPPED) { | |
85 | struct sockaddr_in sin; | |
86 | ||
87 | if (__ipv6_only_sock(sk)) { | |
88 | err = -ENETUNREACH; | |
89 | goto out; | |
90 | } | |
91 | sin.sin_family = AF_INET; | |
92 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; | |
93 | sin.sin_port = usin->sin6_port; | |
94 | ||
1ab1457c YH |
95 | err = ip4_datagram_connect(sk, |
96 | (struct sockaddr*) &sin, | |
1da177e4 LT |
97 | sizeof(sin)); |
98 | ||
99 | ipv4_connected: | |
100 | if (err) | |
101 | goto out; | |
1ab1457c | 102 | |
1da177e4 LT |
103 | ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr); |
104 | ||
105 | if (ipv6_addr_any(&np->saddr)) { | |
106 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff), | |
107 | inet->saddr); | |
108 | } | |
109 | ||
110 | if (ipv6_addr_any(&np->rcv_saddr)) { | |
111 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff), | |
112 | inet->rcv_saddr); | |
113 | } | |
114 | goto out; | |
115 | } | |
116 | ||
117 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
118 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
119 | usin->sin6_scope_id) { | |
120 | if (sk->sk_bound_dev_if && | |
121 | sk->sk_bound_dev_if != usin->sin6_scope_id) { | |
122 | err = -EINVAL; | |
123 | goto out; | |
124 | } | |
125 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
126 | if (!sk->sk_bound_dev_if && | |
127 | (addr_type & IPV6_ADDR_MULTICAST)) | |
128 | fl.oif = np->mcast_oif; | |
129 | } | |
130 | ||
131 | /* Connect to link-local address requires an interface */ | |
132 | if (!sk->sk_bound_dev_if) { | |
133 | err = -EINVAL; | |
134 | goto out; | |
135 | } | |
136 | } | |
137 | ||
138 | ipv6_addr_copy(&np->daddr, daddr); | |
139 | np->flow_label = fl.fl6_flowlabel; | |
140 | ||
141 | inet->dport = usin->sin6_port; | |
142 | ||
143 | /* | |
144 | * Check for a route to destination an obtain the | |
145 | * destination cache for it. | |
146 | */ | |
147 | ||
148 | fl.proto = sk->sk_protocol; | |
149 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
150 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
151 | fl.oif = sk->sk_bound_dev_if; | |
152 | fl.fl_ip_dport = inet->dport; | |
153 | fl.fl_ip_sport = inet->sport; | |
154 | ||
155 | if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST)) | |
156 | fl.oif = np->mcast_oif; | |
157 | ||
beb8d13b VY |
158 | security_sk_classify_flow(sk, &fl); |
159 | ||
1da177e4 LT |
160 | if (flowlabel) { |
161 | if (flowlabel->opt && flowlabel->opt->srcrt) { | |
162 | struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt; | |
163 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
164 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
165 | final_p = &final; | |
166 | } | |
167 | } else if (np->opt && np->opt->srcrt) { | |
168 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
169 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
170 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
171 | final_p = &final; | |
172 | } | |
173 | ||
174 | err = ip6_dst_lookup(sk, &dst, &fl); | |
175 | if (err) | |
176 | goto out; | |
177 | if (final_p) | |
178 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
179 | ||
8eb9086f | 180 | if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0) |
1da177e4 | 181 | goto out; |
1da177e4 LT |
182 | |
183 | /* source address lookup done in ip6_dst_lookup */ | |
184 | ||
185 | if (ipv6_addr_any(&np->saddr)) | |
186 | ipv6_addr_copy(&np->saddr, &fl.fl6_src); | |
187 | ||
188 | if (ipv6_addr_any(&np->rcv_saddr)) { | |
189 | ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); | |
190 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
191 | } | |
192 | ||
193 | ip6_dst_store(sk, dst, | |
194 | ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? | |
8e1ef0a9 YH |
195 | &np->daddr : NULL, |
196 | #ifdef CONFIG_IPV6_SUBTREES | |
197 | ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? | |
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 | } | |
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); | |
212 | struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw; | |
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 | ||
222 | serr = SKB_EXT_ERR(skb); | |
223 | serr->ee.ee_errno = err; | |
224 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; | |
1ab1457c | 225 | serr->ee.ee_type = icmph->icmp6_type; |
1da177e4 LT |
226 | serr->ee.ee_code = icmph->icmp6_code; |
227 | serr->ee.ee_pad = 0; | |
228 | serr->ee.ee_info = info; | |
229 | serr->ee.ee_data = 0; | |
d56f90a7 ACM |
230 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
231 | skb_network_header(skb); | |
1da177e4 LT |
232 | serr->port = port; |
233 | ||
234 | skb->h.raw = payload; | |
235 | __skb_pull(skb, payload - skb->data); | |
236 | ||
237 | if (sock_queue_err_skb(sk, skb)) | |
238 | kfree_skb(skb); | |
239 | } | |
240 | ||
241 | void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) | |
242 | { | |
243 | struct ipv6_pinfo *np = inet6_sk(sk); | |
244 | struct sock_exterr_skb *serr; | |
245 | struct ipv6hdr *iph; | |
246 | struct sk_buff *skb; | |
247 | ||
248 | if (!np->recverr) | |
249 | return; | |
250 | ||
251 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
252 | if (!skb) | |
253 | return; | |
254 | ||
1ced98e8 ACM |
255 | skb_put(skb, sizeof(struct ipv6hdr)); |
256 | skb_reset_network_header(skb); | |
0660e03f | 257 | iph = ipv6_hdr(skb); |
1da177e4 LT |
258 | ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); |
259 | ||
260 | serr = SKB_EXT_ERR(skb); | |
261 | serr->ee.ee_errno = err; | |
262 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
1ab1457c | 263 | serr->ee.ee_type = 0; |
1da177e4 LT |
264 | serr->ee.ee_code = 0; |
265 | serr->ee.ee_pad = 0; | |
266 | serr->ee.ee_info = info; | |
267 | serr->ee.ee_data = 0; | |
d56f90a7 | 268 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
269 | serr->port = fl->fl_ip_dport; |
270 | ||
271 | skb->h.raw = skb->tail; | |
272 | __skb_pull(skb, skb->tail - skb->data); | |
273 | ||
274 | if (sock_queue_err_skb(sk, skb)) | |
275 | kfree_skb(skb); | |
276 | } | |
277 | ||
1ab1457c | 278 | /* |
1da177e4 LT |
279 | * Handle MSG_ERRQUEUE |
280 | */ | |
281 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
282 | { | |
283 | struct ipv6_pinfo *np = inet6_sk(sk); | |
284 | struct sock_exterr_skb *serr; | |
285 | struct sk_buff *skb, *skb2; | |
286 | struct sockaddr_in6 *sin; | |
287 | struct { | |
288 | struct sock_extended_err ee; | |
289 | struct sockaddr_in6 offender; | |
290 | } errhdr; | |
291 | int err; | |
292 | int copied; | |
293 | ||
294 | err = -EAGAIN; | |
295 | skb = skb_dequeue(&sk->sk_error_queue); | |
296 | if (skb == NULL) | |
297 | goto out; | |
298 | ||
299 | copied = skb->len; | |
300 | if (copied > len) { | |
301 | msg->msg_flags |= MSG_TRUNC; | |
302 | copied = len; | |
303 | } | |
304 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
305 | if (err) | |
306 | goto out_free_skb; | |
307 | ||
308 | sock_recv_timestamp(msg, sk, skb); | |
309 | ||
310 | serr = SKB_EXT_ERR(skb); | |
311 | ||
312 | sin = (struct sockaddr_in6 *)msg->msg_name; | |
313 | if (sin) { | |
d56f90a7 | 314 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
315 | sin->sin6_family = AF_INET6; |
316 | sin->sin6_flowinfo = 0; | |
1ab1457c | 317 | sin->sin6_port = serr->port; |
1da177e4 LT |
318 | sin->sin6_scope_id = 0; |
319 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { | |
320 | ipv6_addr_copy(&sin->sin6_addr, | |
d56f90a7 | 321 | (struct in6_addr *)(nh + serr->addr_offset)); |
1da177e4 | 322 | if (np->sndflow) |
d56f90a7 ACM |
323 | sin->sin6_flowinfo = |
324 | (*(__be32 *)(nh + serr->addr_offset - 24) & | |
325 | IPV6_FLOWINFO_MASK); | |
1da177e4 LT |
326 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
327 | sin->sin6_scope_id = IP6CB(skb)->iif; | |
328 | } else { | |
329 | ipv6_addr_set(&sin->sin6_addr, 0, 0, | |
330 | htonl(0xffff), | |
d56f90a7 | 331 | *(__be32 *)(nh + serr->addr_offset)); |
1da177e4 LT |
332 | } |
333 | } | |
334 | ||
335 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
336 | sin = &errhdr.offender; | |
337 | sin->sin6_family = AF_UNSPEC; | |
338 | if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { | |
339 | sin->sin6_family = AF_INET6; | |
340 | sin->sin6_flowinfo = 0; | |
341 | sin->sin6_scope_id = 0; | |
342 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { | |
0660e03f | 343 | ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr); |
1da177e4 LT |
344 | if (np->rxopt.all) |
345 | datagram_recv_ctl(sk, msg, skb); | |
346 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
347 | sin->sin6_scope_id = IP6CB(skb)->iif; | |
348 | } else { | |
349 | struct inet_sock *inet = inet_sk(sk); | |
350 | ||
351 | ipv6_addr_set(&sin->sin6_addr, 0, 0, | |
eddc9ec5 | 352 | htonl(0xffff), ip_hdr(skb)->saddr); |
1da177e4 LT |
353 | if (inet->cmsg_flags) |
354 | ip_cmsg_recv(msg, skb); | |
355 | } | |
356 | } | |
357 | ||
358 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); | |
359 | ||
360 | /* Now we could try to dump offended packet options */ | |
361 | ||
362 | msg->msg_flags |= MSG_ERRQUEUE; | |
363 | err = copied; | |
364 | ||
365 | /* Reset and regenerate socket error */ | |
e0f9f858 | 366 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
367 | sk->sk_err = 0; |
368 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
369 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
e0f9f858 | 370 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
371 | sk->sk_error_report(sk); |
372 | } else { | |
e0f9f858 | 373 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
374 | } |
375 | ||
1ab1457c | 376 | out_free_skb: |
1da177e4 LT |
377 | kfree_skb(skb); |
378 | out: | |
379 | return err; | |
380 | } | |
381 | ||
382 | ||
383 | ||
384 | int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) | |
385 | { | |
386 | struct ipv6_pinfo *np = inet6_sk(sk); | |
387 | struct inet6_skb_parm *opt = IP6CB(skb); | |
d56f90a7 | 388 | unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
389 | |
390 | if (np->rxopt.bits.rxinfo) { | |
391 | struct in6_pktinfo src_info; | |
392 | ||
393 | src_info.ipi6_ifindex = opt->iif; | |
0660e03f | 394 | ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
395 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); |
396 | } | |
397 | ||
398 | if (np->rxopt.bits.rxhlim) { | |
0660e03f | 399 | int hlim = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
400 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
401 | } | |
402 | ||
41a1f8ea | 403 | if (np->rxopt.bits.rxtclass) { |
0660e03f | 404 | int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; |
41a1f8ea YH |
405 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
406 | } | |
407 | ||
d56f90a7 ACM |
408 | if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { |
409 | __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; | |
1da177e4 LT |
410 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); |
411 | } | |
333fad53 YH |
412 | |
413 | /* HbH is allowed only once */ | |
1da177e4 | 414 | if (np->rxopt.bits.hopopts && opt->hop) { |
d56f90a7 | 415 | u8 *ptr = nh + opt->hop; |
1da177e4 LT |
416 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
417 | } | |
333fad53 YH |
418 | |
419 | if (opt->lastopt && | |
420 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { | |
421 | /* | |
422 | * Silly enough, but we need to reparse in order to | |
423 | * report extension headers (except for HbH) | |
424 | * in order. | |
425 | * | |
1ab1457c | 426 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
333fad53 YH |
427 | * (and WILL NOT be) defined because |
428 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji | |
429 | */ | |
430 | unsigned int off = sizeof(struct ipv6hdr); | |
0660e03f | 431 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
333fad53 YH |
432 | |
433 | while (off <= opt->lastopt) { | |
434 | unsigned len; | |
d56f90a7 | 435 | u8 *ptr = nh + off; |
333fad53 YH |
436 | |
437 | switch(nexthdr) { | |
438 | case IPPROTO_DSTOPTS: | |
439 | nexthdr = ptr[0]; | |
440 | len = (ptr[1] + 1) << 3; | |
441 | if (np->rxopt.bits.dstopts) | |
442 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); | |
443 | break; | |
444 | case IPPROTO_ROUTING: | |
445 | nexthdr = ptr[0]; | |
446 | len = (ptr[1] + 1) << 3; | |
447 | if (np->rxopt.bits.srcrt) | |
448 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); | |
449 | break; | |
450 | case IPPROTO_AH: | |
451 | nexthdr = ptr[0]; | |
a3059893 | 452 | len = (ptr[1] + 2) << 2; |
333fad53 YH |
453 | break; |
454 | default: | |
455 | nexthdr = ptr[0]; | |
456 | len = (ptr[1] + 1) << 3; | |
457 | break; | |
458 | } | |
459 | ||
460 | off += len; | |
461 | } | |
462 | } | |
463 | ||
464 | /* socket options in old style */ | |
465 | if (np->rxopt.bits.rxoinfo) { | |
466 | struct in6_pktinfo src_info; | |
467 | ||
468 | src_info.ipi6_ifindex = opt->iif; | |
0660e03f | 469 | ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); |
333fad53 YH |
470 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
471 | } | |
472 | if (np->rxopt.bits.rxohlim) { | |
0660e03f | 473 | int hlim = ipv6_hdr(skb)->hop_limit; |
333fad53 YH |
474 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
475 | } | |
476 | if (np->rxopt.bits.ohopopts && opt->hop) { | |
d56f90a7 | 477 | u8 *ptr = nh + opt->hop; |
333fad53 YH |
478 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
479 | } | |
480 | if (np->rxopt.bits.odstopts && opt->dst0) { | |
d56f90a7 | 481 | u8 *ptr = nh + opt->dst0; |
333fad53 | 482 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 483 | } |
333fad53 | 484 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
d56f90a7 | 485 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
333fad53 | 486 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
1da177e4 | 487 | } |
333fad53 | 488 | if (np->rxopt.bits.odstopts && opt->dst1) { |
d56f90a7 | 489 | u8 *ptr = nh + opt->dst1; |
333fad53 | 490 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 LT |
491 | } |
492 | return 0; | |
493 | } | |
494 | ||
495 | int datagram_send_ctl(struct msghdr *msg, struct flowi *fl, | |
496 | struct ipv6_txoptions *opt, | |
41a1f8ea | 497 | int *hlimit, int *tclass) |
1da177e4 LT |
498 | { |
499 | struct in6_pktinfo *src_info; | |
500 | struct cmsghdr *cmsg; | |
501 | struct ipv6_rt_hdr *rthdr; | |
502 | struct ipv6_opt_hdr *hdr; | |
503 | int len; | |
504 | int err = 0; | |
505 | ||
506 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
507 | int addr_type; | |
508 | struct net_device *dev = NULL; | |
509 | ||
510 | if (!CMSG_OK(msg, cmsg)) { | |
511 | err = -EINVAL; | |
512 | goto exit_f; | |
513 | } | |
514 | ||
515 | if (cmsg->cmsg_level != SOL_IPV6) | |
516 | continue; | |
517 | ||
518 | switch (cmsg->cmsg_type) { | |
1ab1457c YH |
519 | case IPV6_PKTINFO: |
520 | case IPV6_2292PKTINFO: | |
521 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { | |
1da177e4 LT |
522 | err = -EINVAL; |
523 | goto exit_f; | |
524 | } | |
525 | ||
526 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
1ab1457c | 527 | |
1da177e4 LT |
528 | if (src_info->ipi6_ifindex) { |
529 | if (fl->oif && src_info->ipi6_ifindex != fl->oif) | |
530 | return -EINVAL; | |
531 | fl->oif = src_info->ipi6_ifindex; | |
532 | } | |
533 | ||
534 | addr_type = ipv6_addr_type(&src_info->ipi6_addr); | |
535 | ||
536 | if (addr_type == IPV6_ADDR_ANY) | |
537 | break; | |
1ab1457c | 538 | |
1da177e4 LT |
539 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
540 | if (!src_info->ipi6_ifindex) | |
541 | return -EINVAL; | |
542 | else { | |
543 | dev = dev_get_by_index(src_info->ipi6_ifindex); | |
544 | if (!dev) | |
545 | return -ENODEV; | |
546 | } | |
547 | } | |
548 | if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) { | |
549 | if (dev) | |
550 | dev_put(dev); | |
551 | err = -EINVAL; | |
552 | goto exit_f; | |
553 | } | |
554 | if (dev) | |
555 | dev_put(dev); | |
556 | ||
557 | ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); | |
558 | break; | |
559 | ||
560 | case IPV6_FLOWINFO: | |
1ab1457c | 561 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
1da177e4 LT |
562 | err = -EINVAL; |
563 | goto exit_f; | |
564 | } | |
565 | ||
566 | if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { | |
90bcaf7b | 567 | if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { |
1da177e4 LT |
568 | err = -EINVAL; |
569 | goto exit_f; | |
570 | } | |
571 | } | |
90bcaf7b | 572 | fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
1da177e4 LT |
573 | break; |
574 | ||
333fad53 | 575 | case IPV6_2292HOPOPTS: |
1da177e4 | 576 | case IPV6_HOPOPTS: |
1ab1457c | 577 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
578 | err = -EINVAL; |
579 | goto exit_f; | |
580 | } | |
581 | ||
582 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
583 | len = ((hdr->hdrlen + 1) << 3); | |
584 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
585 | err = -EINVAL; | |
586 | goto exit_f; | |
587 | } | |
588 | if (!capable(CAP_NET_RAW)) { | |
589 | err = -EPERM; | |
590 | goto exit_f; | |
591 | } | |
592 | opt->opt_nflen += len; | |
593 | opt->hopopt = hdr; | |
594 | break; | |
595 | ||
333fad53 | 596 | case IPV6_2292DSTOPTS: |
1ab1457c | 597 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
598 | err = -EINVAL; |
599 | goto exit_f; | |
600 | } | |
601 | ||
602 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
603 | len = ((hdr->hdrlen + 1) << 3); | |
604 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
605 | err = -EINVAL; | |
606 | goto exit_f; | |
607 | } | |
608 | if (!capable(CAP_NET_RAW)) { | |
609 | err = -EPERM; | |
610 | goto exit_f; | |
611 | } | |
612 | if (opt->dst1opt) { | |
613 | err = -EINVAL; | |
614 | goto exit_f; | |
615 | } | |
616 | opt->opt_flen += len; | |
617 | opt->dst1opt = hdr; | |
618 | break; | |
619 | ||
333fad53 YH |
620 | case IPV6_DSTOPTS: |
621 | case IPV6_RTHDRDSTOPTS: | |
622 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
623 | err = -EINVAL; | |
624 | goto exit_f; | |
625 | } | |
626 | ||
627 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
628 | len = ((hdr->hdrlen + 1) << 3); | |
629 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
630 | err = -EINVAL; | |
631 | goto exit_f; | |
632 | } | |
633 | if (!capable(CAP_NET_RAW)) { | |
634 | err = -EPERM; | |
635 | goto exit_f; | |
636 | } | |
637 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { | |
638 | opt->opt_flen += len; | |
639 | opt->dst1opt = hdr; | |
640 | } else { | |
641 | opt->opt_nflen += len; | |
642 | opt->dst0opt = hdr; | |
643 | } | |
644 | break; | |
645 | ||
646 | case IPV6_2292RTHDR: | |
1da177e4 | 647 | case IPV6_RTHDR: |
1ab1457c | 648 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
1da177e4 LT |
649 | err = -EINVAL; |
650 | goto exit_f; | |
651 | } | |
652 | ||
653 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
654 | ||
280a9d34 MN |
655 | switch (rthdr->type) { |
656 | case IPV6_SRCRT_TYPE_0: | |
657 | #ifdef CONFIG_IPV6_MIP6 | |
658 | case IPV6_SRCRT_TYPE_2: | |
659 | #endif | |
660 | break; | |
661 | default: | |
1da177e4 LT |
662 | err = -EINVAL; |
663 | goto exit_f; | |
664 | } | |
665 | ||
666 | len = ((rthdr->hdrlen + 1) << 3); | |
667 | ||
1ab1457c | 668 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
1da177e4 LT |
669 | err = -EINVAL; |
670 | goto exit_f; | |
671 | } | |
672 | ||
673 | /* segments left must also match */ | |
674 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
675 | err = -EINVAL; | |
676 | goto exit_f; | |
677 | } | |
678 | ||
679 | opt->opt_nflen += len; | |
680 | opt->srcrt = rthdr; | |
681 | ||
333fad53 | 682 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
1da177e4 LT |
683 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
684 | ||
685 | opt->opt_nflen += dsthdrlen; | |
686 | opt->dst0opt = opt->dst1opt; | |
687 | opt->dst1opt = NULL; | |
688 | opt->opt_flen -= dsthdrlen; | |
689 | } | |
690 | ||
691 | break; | |
692 | ||
333fad53 | 693 | case IPV6_2292HOPLIMIT: |
1da177e4 LT |
694 | case IPV6_HOPLIMIT: |
695 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
696 | err = -EINVAL; | |
697 | goto exit_f; | |
698 | } | |
699 | ||
700 | *hlimit = *(int *)CMSG_DATA(cmsg); | |
701 | break; | |
702 | ||
41a1f8ea YH |
703 | case IPV6_TCLASS: |
704 | { | |
705 | int tc; | |
706 | ||
707 | err = -EINVAL; | |
708 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
709 | goto exit_f; | |
710 | } | |
711 | ||
712 | tc = *(int *)CMSG_DATA(cmsg); | |
d0ee011f | 713 | if (tc < -1 || tc > 0xff) |
41a1f8ea YH |
714 | goto exit_f; |
715 | ||
716 | err = 0; | |
717 | *tclass = tc; | |
718 | ||
719 | break; | |
720 | } | |
1da177e4 | 721 | default: |
64ce2073 | 722 | LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", |
1ab1457c | 723 | cmsg->cmsg_type); |
1da177e4 LT |
724 | err = -EINVAL; |
725 | break; | |
726 | }; | |
727 | } | |
728 | ||
729 | exit_f: | |
730 | return err; | |
731 | } |