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1da177e4 LT |
1 | /* |
2 | * common UDP/RAW code | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
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 | ||
16 | #include <linux/errno.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/sched.h> | |
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) | |
57 | return -EINVAL; | |
58 | ||
59 | if (usin->sin6_family != AF_INET6) | |
60 | return -EAFNOSUPPORT; | |
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 | ||
95 | err = ip4_datagram_connect(sk, | |
96 | (struct sockaddr*) &sin, | |
97 | sizeof(sin)); | |
98 | ||
99 | ipv4_connected: | |
100 | if (err) | |
101 | goto out; | |
102 | ||
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 | ||
158 | if (flowlabel) { | |
159 | if (flowlabel->opt && flowlabel->opt->srcrt) { | |
160 | struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt; | |
161 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
162 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
163 | final_p = &final; | |
164 | } | |
165 | } else if (np->opt && np->opt->srcrt) { | |
166 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
167 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
168 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
169 | final_p = &final; | |
170 | } | |
171 | ||
172 | err = ip6_dst_lookup(sk, &dst, &fl); | |
173 | if (err) | |
174 | goto out; | |
175 | if (final_p) | |
176 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
177 | ||
178 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
179 | dst_release(dst); | |
180 | goto out; | |
181 | } | |
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) ? | |
195 | &np->daddr : NULL); | |
196 | ||
197 | sk->sk_state = TCP_ESTABLISHED; | |
198 | out: | |
199 | fl6_sock_release(flowlabel); | |
200 | return err; | |
201 | } | |
202 | ||
203 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, | |
204 | u16 port, u32 info, u8 *payload) | |
205 | { | |
206 | struct ipv6_pinfo *np = inet6_sk(sk); | |
207 | struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw; | |
208 | struct sock_exterr_skb *serr; | |
209 | ||
210 | if (!np->recverr) | |
211 | return; | |
212 | ||
213 | skb = skb_clone(skb, GFP_ATOMIC); | |
214 | if (!skb) | |
215 | return; | |
216 | ||
217 | serr = SKB_EXT_ERR(skb); | |
218 | serr->ee.ee_errno = err; | |
219 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; | |
220 | serr->ee.ee_type = icmph->icmp6_type; | |
221 | serr->ee.ee_code = icmph->icmp6_code; | |
222 | serr->ee.ee_pad = 0; | |
223 | serr->ee.ee_info = info; | |
224 | serr->ee.ee_data = 0; | |
225 | serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw; | |
226 | serr->port = port; | |
227 | ||
228 | skb->h.raw = payload; | |
229 | __skb_pull(skb, payload - skb->data); | |
230 | ||
231 | if (sock_queue_err_skb(sk, skb)) | |
232 | kfree_skb(skb); | |
233 | } | |
234 | ||
235 | void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) | |
236 | { | |
237 | struct ipv6_pinfo *np = inet6_sk(sk); | |
238 | struct sock_exterr_skb *serr; | |
239 | struct ipv6hdr *iph; | |
240 | struct sk_buff *skb; | |
241 | ||
242 | if (!np->recverr) | |
243 | return; | |
244 | ||
245 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
246 | if (!skb) | |
247 | return; | |
248 | ||
249 | iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr)); | |
250 | skb->nh.ipv6h = iph; | |
251 | ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); | |
252 | ||
253 | serr = SKB_EXT_ERR(skb); | |
254 | serr->ee.ee_errno = err; | |
255 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
256 | serr->ee.ee_type = 0; | |
257 | serr->ee.ee_code = 0; | |
258 | serr->ee.ee_pad = 0; | |
259 | serr->ee.ee_info = info; | |
260 | serr->ee.ee_data = 0; | |
261 | serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw; | |
262 | serr->port = fl->fl_ip_dport; | |
263 | ||
264 | skb->h.raw = skb->tail; | |
265 | __skb_pull(skb, skb->tail - skb->data); | |
266 | ||
267 | if (sock_queue_err_skb(sk, skb)) | |
268 | kfree_skb(skb); | |
269 | } | |
270 | ||
271 | /* | |
272 | * Handle MSG_ERRQUEUE | |
273 | */ | |
274 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
275 | { | |
276 | struct ipv6_pinfo *np = inet6_sk(sk); | |
277 | struct sock_exterr_skb *serr; | |
278 | struct sk_buff *skb, *skb2; | |
279 | struct sockaddr_in6 *sin; | |
280 | struct { | |
281 | struct sock_extended_err ee; | |
282 | struct sockaddr_in6 offender; | |
283 | } errhdr; | |
284 | int err; | |
285 | int copied; | |
286 | ||
287 | err = -EAGAIN; | |
288 | skb = skb_dequeue(&sk->sk_error_queue); | |
289 | if (skb == NULL) | |
290 | goto out; | |
291 | ||
292 | copied = skb->len; | |
293 | if (copied > len) { | |
294 | msg->msg_flags |= MSG_TRUNC; | |
295 | copied = len; | |
296 | } | |
297 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
298 | if (err) | |
299 | goto out_free_skb; | |
300 | ||
301 | sock_recv_timestamp(msg, sk, skb); | |
302 | ||
303 | serr = SKB_EXT_ERR(skb); | |
304 | ||
305 | sin = (struct sockaddr_in6 *)msg->msg_name; | |
306 | if (sin) { | |
307 | sin->sin6_family = AF_INET6; | |
308 | sin->sin6_flowinfo = 0; | |
309 | sin->sin6_port = serr->port; | |
310 | sin->sin6_scope_id = 0; | |
311 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { | |
312 | ipv6_addr_copy(&sin->sin6_addr, | |
313 | (struct in6_addr *)(skb->nh.raw + serr->addr_offset)); | |
314 | if (np->sndflow) | |
315 | sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK; | |
316 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
317 | sin->sin6_scope_id = IP6CB(skb)->iif; | |
318 | } else { | |
319 | ipv6_addr_set(&sin->sin6_addr, 0, 0, | |
320 | htonl(0xffff), | |
321 | *(u32*)(skb->nh.raw + serr->addr_offset)); | |
322 | } | |
323 | } | |
324 | ||
325 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
326 | sin = &errhdr.offender; | |
327 | sin->sin6_family = AF_UNSPEC; | |
328 | if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { | |
329 | sin->sin6_family = AF_INET6; | |
330 | sin->sin6_flowinfo = 0; | |
331 | sin->sin6_scope_id = 0; | |
332 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { | |
333 | ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr); | |
334 | if (np->rxopt.all) | |
335 | datagram_recv_ctl(sk, msg, skb); | |
336 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
337 | sin->sin6_scope_id = IP6CB(skb)->iif; | |
338 | } else { | |
339 | struct inet_sock *inet = inet_sk(sk); | |
340 | ||
341 | ipv6_addr_set(&sin->sin6_addr, 0, 0, | |
342 | htonl(0xffff), | |
343 | skb->nh.iph->saddr); | |
344 | if (inet->cmsg_flags) | |
345 | ip_cmsg_recv(msg, skb); | |
346 | } | |
347 | } | |
348 | ||
349 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); | |
350 | ||
351 | /* Now we could try to dump offended packet options */ | |
352 | ||
353 | msg->msg_flags |= MSG_ERRQUEUE; | |
354 | err = copied; | |
355 | ||
356 | /* Reset and regenerate socket error */ | |
e0f9f858 | 357 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
358 | sk->sk_err = 0; |
359 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
360 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
e0f9f858 | 361 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
362 | sk->sk_error_report(sk); |
363 | } else { | |
e0f9f858 | 364 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
365 | } |
366 | ||
367 | out_free_skb: | |
368 | kfree_skb(skb); | |
369 | out: | |
370 | return err; | |
371 | } | |
372 | ||
373 | ||
374 | ||
375 | int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) | |
376 | { | |
377 | struct ipv6_pinfo *np = inet6_sk(sk); | |
378 | struct inet6_skb_parm *opt = IP6CB(skb); | |
379 | ||
380 | if (np->rxopt.bits.rxinfo) { | |
381 | struct in6_pktinfo src_info; | |
382 | ||
383 | src_info.ipi6_ifindex = opt->iif; | |
384 | ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); | |
385 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); | |
386 | } | |
387 | ||
388 | if (np->rxopt.bits.rxhlim) { | |
389 | int hlim = skb->nh.ipv6h->hop_limit; | |
390 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); | |
391 | } | |
392 | ||
393 | if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) { | |
394 | u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK; | |
395 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); | |
396 | } | |
397 | if (np->rxopt.bits.hopopts && opt->hop) { | |
398 | u8 *ptr = skb->nh.raw + opt->hop; | |
399 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); | |
400 | } | |
401 | if (np->rxopt.bits.dstopts && opt->dst0) { | |
402 | u8 *ptr = skb->nh.raw + opt->dst0; | |
403 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr); | |
404 | } | |
405 | if (np->rxopt.bits.srcrt && opt->srcrt) { | |
406 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt); | |
407 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, (rthdr->hdrlen+1) << 3, rthdr); | |
408 | } | |
409 | if (np->rxopt.bits.dstopts && opt->dst1) { | |
410 | u8 *ptr = skb->nh.raw + opt->dst1; | |
411 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr); | |
412 | } | |
413 | return 0; | |
414 | } | |
415 | ||
416 | int datagram_send_ctl(struct msghdr *msg, struct flowi *fl, | |
417 | struct ipv6_txoptions *opt, | |
418 | int *hlimit) | |
419 | { | |
420 | struct in6_pktinfo *src_info; | |
421 | struct cmsghdr *cmsg; | |
422 | struct ipv6_rt_hdr *rthdr; | |
423 | struct ipv6_opt_hdr *hdr; | |
424 | int len; | |
425 | int err = 0; | |
426 | ||
427 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
428 | int addr_type; | |
429 | struct net_device *dev = NULL; | |
430 | ||
431 | if (!CMSG_OK(msg, cmsg)) { | |
432 | err = -EINVAL; | |
433 | goto exit_f; | |
434 | } | |
435 | ||
436 | if (cmsg->cmsg_level != SOL_IPV6) | |
437 | continue; | |
438 | ||
439 | switch (cmsg->cmsg_type) { | |
440 | case IPV6_PKTINFO: | |
441 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { | |
442 | err = -EINVAL; | |
443 | goto exit_f; | |
444 | } | |
445 | ||
446 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
447 | ||
448 | if (src_info->ipi6_ifindex) { | |
449 | if (fl->oif && src_info->ipi6_ifindex != fl->oif) | |
450 | return -EINVAL; | |
451 | fl->oif = src_info->ipi6_ifindex; | |
452 | } | |
453 | ||
454 | addr_type = ipv6_addr_type(&src_info->ipi6_addr); | |
455 | ||
456 | if (addr_type == IPV6_ADDR_ANY) | |
457 | break; | |
458 | ||
459 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
460 | if (!src_info->ipi6_ifindex) | |
461 | return -EINVAL; | |
462 | else { | |
463 | dev = dev_get_by_index(src_info->ipi6_ifindex); | |
464 | if (!dev) | |
465 | return -ENODEV; | |
466 | } | |
467 | } | |
468 | if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) { | |
469 | if (dev) | |
470 | dev_put(dev); | |
471 | err = -EINVAL; | |
472 | goto exit_f; | |
473 | } | |
474 | if (dev) | |
475 | dev_put(dev); | |
476 | ||
477 | ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); | |
478 | break; | |
479 | ||
480 | case IPV6_FLOWINFO: | |
481 | if (cmsg->cmsg_len < CMSG_LEN(4)) { | |
482 | err = -EINVAL; | |
483 | goto exit_f; | |
484 | } | |
485 | ||
486 | if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { | |
487 | if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { | |
488 | err = -EINVAL; | |
489 | goto exit_f; | |
490 | } | |
491 | } | |
492 | fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg); | |
493 | break; | |
494 | ||
495 | case IPV6_HOPOPTS: | |
496 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
497 | err = -EINVAL; | |
498 | goto exit_f; | |
499 | } | |
500 | ||
501 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
502 | len = ((hdr->hdrlen + 1) << 3); | |
503 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
504 | err = -EINVAL; | |
505 | goto exit_f; | |
506 | } | |
507 | if (!capable(CAP_NET_RAW)) { | |
508 | err = -EPERM; | |
509 | goto exit_f; | |
510 | } | |
511 | opt->opt_nflen += len; | |
512 | opt->hopopt = hdr; | |
513 | break; | |
514 | ||
515 | case IPV6_DSTOPTS: | |
516 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
517 | err = -EINVAL; | |
518 | goto exit_f; | |
519 | } | |
520 | ||
521 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
522 | len = ((hdr->hdrlen + 1) << 3); | |
523 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
524 | err = -EINVAL; | |
525 | goto exit_f; | |
526 | } | |
527 | if (!capable(CAP_NET_RAW)) { | |
528 | err = -EPERM; | |
529 | goto exit_f; | |
530 | } | |
531 | if (opt->dst1opt) { | |
532 | err = -EINVAL; | |
533 | goto exit_f; | |
534 | } | |
535 | opt->opt_flen += len; | |
536 | opt->dst1opt = hdr; | |
537 | break; | |
538 | ||
539 | case IPV6_RTHDR: | |
540 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { | |
541 | err = -EINVAL; | |
542 | goto exit_f; | |
543 | } | |
544 | ||
545 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
546 | ||
547 | /* | |
548 | * TYPE 0 | |
549 | */ | |
550 | if (rthdr->type) { | |
551 | err = -EINVAL; | |
552 | goto exit_f; | |
553 | } | |
554 | ||
555 | len = ((rthdr->hdrlen + 1) << 3); | |
556 | ||
557 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
558 | err = -EINVAL; | |
559 | goto exit_f; | |
560 | } | |
561 | ||
562 | /* segments left must also match */ | |
563 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
564 | err = -EINVAL; | |
565 | goto exit_f; | |
566 | } | |
567 | ||
568 | opt->opt_nflen += len; | |
569 | opt->srcrt = rthdr; | |
570 | ||
571 | if (opt->dst1opt) { | |
572 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); | |
573 | ||
574 | opt->opt_nflen += dsthdrlen; | |
575 | opt->dst0opt = opt->dst1opt; | |
576 | opt->dst1opt = NULL; | |
577 | opt->opt_flen -= dsthdrlen; | |
578 | } | |
579 | ||
580 | break; | |
581 | ||
582 | case IPV6_HOPLIMIT: | |
583 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
584 | err = -EINVAL; | |
585 | goto exit_f; | |
586 | } | |
587 | ||
588 | *hlimit = *(int *)CMSG_DATA(cmsg); | |
589 | break; | |
590 | ||
591 | default: | |
592 | LIMIT_NETDEBUG( | |
593 | printk(KERN_DEBUG "invalid cmsg type: %d\n", cmsg->cmsg_type)); | |
594 | err = -EINVAL; | |
595 | break; | |
596 | }; | |
597 | } | |
598 | ||
599 | exit_f: | |
600 | return err; | |
601 | } |