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>
32
33 #include <linux/errqueue.h>
34 #include <asm/uaccess.h>
35
36 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
37 {
38 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
39 struct inet_sock *inet = inet_sk(sk);
40 struct ipv6_pinfo *np = inet6_sk(sk);
41 struct in6_addr *daddr, *final_p = NULL, final;
42 struct dst_entry *dst;
43 struct flowi fl;
44 struct ip6_flowlabel *flowlabel = NULL;
45 int addr_type;
46 int err;
47
48 if (usin->sin6_family == AF_INET) {
49 if (__ipv6_only_sock(sk))
50 return -EAFNOSUPPORT;
51 err = ip4_datagram_connect(sk, uaddr, addr_len);
52 goto ipv4_connected;
53 }
54
55 if (addr_len < SIN6_LEN_RFC2133)
56 return -EINVAL;
57
58 if (usin->sin6_family != AF_INET6)
59 return -EAFNOSUPPORT;
60
61 memset(&fl, 0, sizeof(fl));
62 if (np->sndflow) {
63 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
64 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
65 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
66 if (flowlabel == NULL)
67 return -EINVAL;
68 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
69 }
70 }
71
72 addr_type = ipv6_addr_type(&usin->sin6_addr);
73
74 if (addr_type == IPV6_ADDR_ANY) {
75 /*
76 * connect to self
77 */
78 usin->sin6_addr.s6_addr[15] = 0x01;
79 }
80
81 daddr = &usin->sin6_addr;
82
83 if (addr_type == IPV6_ADDR_MAPPED) {
84 struct sockaddr_in sin;
85
86 if (__ipv6_only_sock(sk)) {
87 err = -ENETUNREACH;
88 goto out;
89 }
90 sin.sin_family = AF_INET;
91 sin.sin_addr.s_addr = daddr->s6_addr32[3];
92 sin.sin_port = usin->sin6_port;
93
94 err = ip4_datagram_connect(sk,
95 (struct sockaddr*) &sin,
96 sizeof(sin));
97
98 ipv4_connected:
99 if (err)
100 goto out;
101
102 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
103
104 if (ipv6_addr_any(&np->saddr)) {
105 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
106 inet->saddr);
107 }
108
109 if (ipv6_addr_any(&np->rcv_saddr)) {
110 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
111 inet->rcv_saddr);
112 }
113 goto out;
114 }
115
116 if (addr_type&IPV6_ADDR_LINKLOCAL) {
117 if (addr_len >= sizeof(struct sockaddr_in6) &&
118 usin->sin6_scope_id) {
119 if (sk->sk_bound_dev_if &&
120 sk->sk_bound_dev_if != usin->sin6_scope_id) {
121 err = -EINVAL;
122 goto out;
123 }
124 sk->sk_bound_dev_if = usin->sin6_scope_id;
125 if (!sk->sk_bound_dev_if &&
126 (addr_type & IPV6_ADDR_MULTICAST))
127 fl.oif = np->mcast_oif;
128 }
129
130 /* Connect to link-local address requires an interface */
131 if (!sk->sk_bound_dev_if) {
132 err = -EINVAL;
133 goto out;
134 }
135 }
136
137 ipv6_addr_copy(&np->daddr, daddr);
138 np->flow_label = fl.fl6_flowlabel;
139
140 inet->dport = usin->sin6_port;
141
142 /*
143 * Check for a route to destination an obtain the
144 * destination cache for it.
145 */
146
147 fl.proto = sk->sk_protocol;
148 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
149 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
150 fl.oif = sk->sk_bound_dev_if;
151 fl.fl_ip_dport = inet->dport;
152 fl.fl_ip_sport = inet->sport;
153
154 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
155 fl.oif = np->mcast_oif;
156
157 if (flowlabel) {
158 if (flowlabel->opt && flowlabel->opt->srcrt) {
159 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
160 ipv6_addr_copy(&final, &fl.fl6_dst);
161 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
162 final_p = &final;
163 }
164 } else if (np->opt && np->opt->srcrt) {
165 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
166 ipv6_addr_copy(&final, &fl.fl6_dst);
167 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
168 final_p = &final;
169 }
170
171 err = ip6_dst_lookup(sk, &dst, &fl);
172 if (err)
173 goto out;
174 if (final_p)
175 ipv6_addr_copy(&fl.fl6_dst, final_p);
176
177 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
178 dst_release(dst);
179 goto out;
180 }
181
182 /* source address lookup done in ip6_dst_lookup */
183
184 if (ipv6_addr_any(&np->saddr))
185 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
186
187 if (ipv6_addr_any(&np->rcv_saddr)) {
188 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
189 inet->rcv_saddr = LOOPBACK4_IPV6;
190 }
191
192 ip6_dst_store(sk, dst,
193 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
194 &np->daddr : NULL);
195
196 sk->sk_state = TCP_ESTABLISHED;
197 out:
198 fl6_sock_release(flowlabel);
199 return err;
200 }
201
202 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
203 u16 port, u32 info, u8 *payload)
204 {
205 struct ipv6_pinfo *np = inet6_sk(sk);
206 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
207 struct sock_exterr_skb *serr;
208
209 if (!np->recverr)
210 return;
211
212 skb = skb_clone(skb, GFP_ATOMIC);
213 if (!skb)
214 return;
215
216 serr = SKB_EXT_ERR(skb);
217 serr->ee.ee_errno = err;
218 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
219 serr->ee.ee_type = icmph->icmp6_type;
220 serr->ee.ee_code = icmph->icmp6_code;
221 serr->ee.ee_pad = 0;
222 serr->ee.ee_info = info;
223 serr->ee.ee_data = 0;
224 serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
225 serr->port = port;
226
227 skb->h.raw = payload;
228 __skb_pull(skb, payload - skb->data);
229
230 if (sock_queue_err_skb(sk, skb))
231 kfree_skb(skb);
232 }
233
234 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
235 {
236 struct ipv6_pinfo *np = inet6_sk(sk);
237 struct sock_exterr_skb *serr;
238 struct ipv6hdr *iph;
239 struct sk_buff *skb;
240
241 if (!np->recverr)
242 return;
243
244 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
245 if (!skb)
246 return;
247
248 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
249 skb->nh.ipv6h = iph;
250 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
251
252 serr = SKB_EXT_ERR(skb);
253 serr->ee.ee_errno = err;
254 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
255 serr->ee.ee_type = 0;
256 serr->ee.ee_code = 0;
257 serr->ee.ee_pad = 0;
258 serr->ee.ee_info = info;
259 serr->ee.ee_data = 0;
260 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
261 serr->port = fl->fl_ip_dport;
262
263 skb->h.raw = skb->tail;
264 __skb_pull(skb, skb->tail - skb->data);
265
266 if (sock_queue_err_skb(sk, skb))
267 kfree_skb(skb);
268 }
269
270 /*
271 * Handle MSG_ERRQUEUE
272 */
273 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
274 {
275 struct ipv6_pinfo *np = inet6_sk(sk);
276 struct sock_exterr_skb *serr;
277 struct sk_buff *skb, *skb2;
278 struct sockaddr_in6 *sin;
279 struct {
280 struct sock_extended_err ee;
281 struct sockaddr_in6 offender;
282 } errhdr;
283 int err;
284 int copied;
285
286 err = -EAGAIN;
287 skb = skb_dequeue(&sk->sk_error_queue);
288 if (skb == NULL)
289 goto out;
290
291 copied = skb->len;
292 if (copied > len) {
293 msg->msg_flags |= MSG_TRUNC;
294 copied = len;
295 }
296 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
297 if (err)
298 goto out_free_skb;
299
300 sock_recv_timestamp(msg, sk, skb);
301
302 serr = SKB_EXT_ERR(skb);
303
304 sin = (struct sockaddr_in6 *)msg->msg_name;
305 if (sin) {
306 sin->sin6_family = AF_INET6;
307 sin->sin6_flowinfo = 0;
308 sin->sin6_port = serr->port;
309 sin->sin6_scope_id = 0;
310 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
311 ipv6_addr_copy(&sin->sin6_addr,
312 (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
313 if (np->sndflow)
314 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
315 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
316 sin->sin6_scope_id = IP6CB(skb)->iif;
317 } else {
318 ipv6_addr_set(&sin->sin6_addr, 0, 0,
319 htonl(0xffff),
320 *(u32*)(skb->nh.raw + serr->addr_offset));
321 }
322 }
323
324 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
325 sin = &errhdr.offender;
326 sin->sin6_family = AF_UNSPEC;
327 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
328 sin->sin6_family = AF_INET6;
329 sin->sin6_flowinfo = 0;
330 sin->sin6_scope_id = 0;
331 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
332 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
333 if (np->rxopt.all)
334 datagram_recv_ctl(sk, msg, skb);
335 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
336 sin->sin6_scope_id = IP6CB(skb)->iif;
337 } else {
338 struct inet_sock *inet = inet_sk(sk);
339
340 ipv6_addr_set(&sin->sin6_addr, 0, 0,
341 htonl(0xffff),
342 skb->nh.iph->saddr);
343 if (inet->cmsg_flags)
344 ip_cmsg_recv(msg, skb);
345 }
346 }
347
348 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
349
350 /* Now we could try to dump offended packet options */
351
352 msg->msg_flags |= MSG_ERRQUEUE;
353 err = copied;
354
355 /* Reset and regenerate socket error */
356 spin_lock_irq(&sk->sk_error_queue.lock);
357 sk->sk_err = 0;
358 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
359 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
360 spin_unlock_irq(&sk->sk_error_queue.lock);
361 sk->sk_error_report(sk);
362 } else {
363 spin_unlock_irq(&sk->sk_error_queue.lock);
364 }
365
366 out_free_skb:
367 kfree_skb(skb);
368 out:
369 return err;
370 }
371
372
373
374 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
375 {
376 struct ipv6_pinfo *np = inet6_sk(sk);
377 struct inet6_skb_parm *opt = IP6CB(skb);
378
379 if (np->rxopt.bits.rxinfo) {
380 struct in6_pktinfo src_info;
381
382 src_info.ipi6_ifindex = opt->iif;
383 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
384 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
385 }
386
387 if (np->rxopt.bits.rxhlim) {
388 int hlim = skb->nh.ipv6h->hop_limit;
389 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
390 }
391
392 if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
393 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
394 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
395 }
396 if (np->rxopt.bits.hopopts && opt->hop) {
397 u8 *ptr = skb->nh.raw + opt->hop;
398 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
399 }
400 if (np->rxopt.bits.dstopts && opt->dst0) {
401 u8 *ptr = skb->nh.raw + opt->dst0;
402 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
403 }
404 if (np->rxopt.bits.srcrt && opt->srcrt) {
405 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
406 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
407 }
408 if (np->rxopt.bits.dstopts && opt->dst1) {
409 u8 *ptr = skb->nh.raw + opt->dst1;
410 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
411 }
412 return 0;
413 }
414
415 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
416 struct ipv6_txoptions *opt,
417 int *hlimit)
418 {
419 struct in6_pktinfo *src_info;
420 struct cmsghdr *cmsg;
421 struct ipv6_rt_hdr *rthdr;
422 struct ipv6_opt_hdr *hdr;
423 int len;
424 int err = 0;
425
426 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
427 int addr_type;
428 struct net_device *dev = NULL;
429
430 if (!CMSG_OK(msg, cmsg)) {
431 err = -EINVAL;
432 goto exit_f;
433 }
434
435 if (cmsg->cmsg_level != SOL_IPV6)
436 continue;
437
438 switch (cmsg->cmsg_type) {
439 case IPV6_PKTINFO:
440 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
441 err = -EINVAL;
442 goto exit_f;
443 }
444
445 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
446
447 if (src_info->ipi6_ifindex) {
448 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
449 return -EINVAL;
450 fl->oif = src_info->ipi6_ifindex;
451 }
452
453 addr_type = ipv6_addr_type(&src_info->ipi6_addr);
454
455 if (addr_type == IPV6_ADDR_ANY)
456 break;
457
458 if (addr_type & IPV6_ADDR_LINKLOCAL) {
459 if (!src_info->ipi6_ifindex)
460 return -EINVAL;
461 else {
462 dev = dev_get_by_index(src_info->ipi6_ifindex);
463 if (!dev)
464 return -ENODEV;
465 }
466 }
467 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
468 if (dev)
469 dev_put(dev);
470 err = -EINVAL;
471 goto exit_f;
472 }
473 if (dev)
474 dev_put(dev);
475
476 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
477 break;
478
479 case IPV6_FLOWINFO:
480 if (cmsg->cmsg_len < CMSG_LEN(4)) {
481 err = -EINVAL;
482 goto exit_f;
483 }
484
485 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
486 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
487 err = -EINVAL;
488 goto exit_f;
489 }
490 }
491 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
492 break;
493
494 case IPV6_HOPOPTS:
495 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
496 err = -EINVAL;
497 goto exit_f;
498 }
499
500 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
501 len = ((hdr->hdrlen + 1) << 3);
502 if (cmsg->cmsg_len < CMSG_LEN(len)) {
503 err = -EINVAL;
504 goto exit_f;
505 }
506 if (!capable(CAP_NET_RAW)) {
507 err = -EPERM;
508 goto exit_f;
509 }
510 opt->opt_nflen += len;
511 opt->hopopt = hdr;
512 break;
513
514 case IPV6_DSTOPTS:
515 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
516 err = -EINVAL;
517 goto exit_f;
518 }
519
520 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
521 len = ((hdr->hdrlen + 1) << 3);
522 if (cmsg->cmsg_len < CMSG_LEN(len)) {
523 err = -EINVAL;
524 goto exit_f;
525 }
526 if (!capable(CAP_NET_RAW)) {
527 err = -EPERM;
528 goto exit_f;
529 }
530 if (opt->dst1opt) {
531 err = -EINVAL;
532 goto exit_f;
533 }
534 opt->opt_flen += len;
535 opt->dst1opt = hdr;
536 break;
537
538 case IPV6_RTHDR:
539 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
540 err = -EINVAL;
541 goto exit_f;
542 }
543
544 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
545
546 /*
547 * TYPE 0
548 */
549 if (rthdr->type) {
550 err = -EINVAL;
551 goto exit_f;
552 }
553
554 len = ((rthdr->hdrlen + 1) << 3);
555
556 if (cmsg->cmsg_len < CMSG_LEN(len)) {
557 err = -EINVAL;
558 goto exit_f;
559 }
560
561 /* segments left must also match */
562 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
563 err = -EINVAL;
564 goto exit_f;
565 }
566
567 opt->opt_nflen += len;
568 opt->srcrt = rthdr;
569
570 if (opt->dst1opt) {
571 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
572
573 opt->opt_nflen += dsthdrlen;
574 opt->dst0opt = opt->dst1opt;
575 opt->dst1opt = NULL;
576 opt->opt_flen -= dsthdrlen;
577 }
578
579 break;
580
581 case IPV6_HOPLIMIT:
582 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
583 err = -EINVAL;
584 goto exit_f;
585 }
586
587 *hlimit = *(int *)CMSG_DATA(cmsg);
588 break;
589
590 default:
591 LIMIT_NETDEBUG(
592 printk(KERN_DEBUG "invalid cmsg type: %d\n", cmsg->cmsg_type));
593 err = -EINVAL;
594 break;
595 };
596 }
597
598 exit_f:
599 return err;
600 }
601
|
This page was automatically generated by the
LXR engine.
|