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fs/9p: [fscache] wait for page write in cached mode
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / datagram.c
blob320bdb877eed2ff61da25c6c9a1ac2f6cc00baac
1 /*
2 * common UDP/RAW code
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
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
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
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>
24 #include <linux/slab.h>
25
26 #include <net/ipv6.h>
27 #include <net/ndisc.h>
28 #include <net/addrconf.h>
29 #include <net/transp_v6.h>
30 #include <net/ip6_route.h>
31 #include <net/tcp_states.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, final;
42 struct dst_entry *dst;
43 struct flowi fl;
44 struct ip6_flowlabel *flowlabel = NULL;
45 struct ipv6_txoptions *opt;
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_v4mapped(inet->inet_daddr, &np->daddr);
104
105 if (ipv6_addr_any(&np->saddr))
106 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
107
108 if (ipv6_addr_any(&np->rcv_saddr)) {
109 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
110 &np->rcv_saddr);
111 if (sk->sk_prot->rehash)
112 sk->sk_prot->rehash(sk);
113 }
114
115 goto out;
116 }
117
118 if (addr_type&IPV6_ADDR_LINKLOCAL) {
119 if (addr_len >= sizeof(struct sockaddr_in6) &&
120 usin->sin6_scope_id) {
121 if (sk->sk_bound_dev_if &&
122 sk->sk_bound_dev_if != usin->sin6_scope_id) {
123 err = -EINVAL;
124 goto out;
125 }
126 sk->sk_bound_dev_if = usin->sin6_scope_id;
127 }
128
129 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
130 sk->sk_bound_dev_if = np->mcast_oif;
131
132 /* Connect to link-local address requires an interface */
133 if (!sk->sk_bound_dev_if) {
134 err = -EINVAL;
135 goto out;
136 }
137 }
138
139 ipv6_addr_copy(&np->daddr, daddr);
140 np->flow_label = fl.fl6_flowlabel;
141
142 inet->inet_dport = usin->sin6_port;
143
144 /*
145 * Check for a route to destination an obtain the
146 * destination cache for it.
147 */
148
149 fl.proto = sk->sk_protocol;
150 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
151 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
152 fl.oif = sk->sk_bound_dev_if;
153 fl.mark = sk->sk_mark;
154 fl.fl_ip_dport = inet->inet_dport;
155 fl.fl_ip_sport = inet->inet_sport;
156
157 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
158 fl.oif = np->mcast_oif;
159
160 security_sk_classify_flow(sk, &fl);
161
162 opt = flowlabel ? flowlabel->opt : np->opt;
163 final_p = fl6_update_dst(&fl, opt, &final);
164
165 err = ip6_dst_lookup(sk, &dst, &fl);
166 if (err)
167 goto out;
168 if (final_p)
169 ipv6_addr_copy(&fl.fl6_dst, final_p);
170
171 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
172 if (err < 0) {
173 if (err == -EREMOTE)
174 err = ip6_dst_blackhole(sk, &dst, &fl);
175 if (err < 0)
176 goto out;
177 }
178
179 /* source address lookup done in ip6_dst_lookup */
180
181 if (ipv6_addr_any(&np->saddr))
182 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
183
184 if (ipv6_addr_any(&np->rcv_saddr)) {
185 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
186 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
187 if (sk->sk_prot->rehash)
188 sk->sk_prot->rehash(sk);
189 }
190
191 ip6_dst_store(sk, dst,
192 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
193 &np->daddr : NULL,
194 #ifdef CONFIG_IPV6_SUBTREES
195 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
196 &np->saddr :
197 #endif
198 NULL);
199
200 sk->sk_state = TCP_ESTABLISHED;
201 out:
202 fl6_sock_release(flowlabel);
203 return err;
204 }
205
206 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
207 __be16 port, u32 info, u8 *payload)
208 {
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct icmp6hdr *icmph = icmp6_hdr(skb);
211 struct sock_exterr_skb *serr;
212
213 if (!np->recverr)
214 return;
215
216 skb = skb_clone(skb, GFP_ATOMIC);
217 if (!skb)
218 return;
219
220 skb->protocol = htons(ETH_P_IPV6);
221
222 serr = SKB_EXT_ERR(skb);
223 serr->ee.ee_errno = err;
224 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
225 serr->ee.ee_type = icmph->icmp6_type;
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;
230 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
231 skb_network_header(skb);
232 serr->port = port;
233
234 __skb_pull(skb, payload - skb->data);
235 skb_reset_transport_header(skb);
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
255 skb->protocol = htons(ETH_P_IPV6);
256
257 skb_put(skb, sizeof(struct ipv6hdr));
258 skb_reset_network_header(skb);
259 iph = ipv6_hdr(skb);
260 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
261
262 serr = SKB_EXT_ERR(skb);
263 serr->ee.ee_errno = err;
264 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
265 serr->ee.ee_type = 0;
266 serr->ee.ee_code = 0;
267 serr->ee.ee_pad = 0;
268 serr->ee.ee_info = info;
269 serr->ee.ee_data = 0;
270 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
271 serr->port = fl->fl_ip_dport;
272
273 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
274 skb_reset_transport_header(skb);
275
276 if (sock_queue_err_skb(sk, skb))
277 kfree_skb(skb);
278 }
279
280 void ipv6_local_rxpmtu(struct sock *sk, struct flowi *fl, u32 mtu)
281 {
282 struct ipv6_pinfo *np = inet6_sk(sk);
283 struct ipv6hdr *iph;
284 struct sk_buff *skb;
285 struct ip6_mtuinfo *mtu_info;
286
287 if (!np->rxopt.bits.rxpmtu)
288 return;
289
290 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
291 if (!skb)
292 return;
293
294 skb_put(skb, sizeof(struct ipv6hdr));
295 skb_reset_network_header(skb);
296 iph = ipv6_hdr(skb);
297 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
298
299 mtu_info = IP6CBMTU(skb);
300 if (!mtu_info) {
301 kfree_skb(skb);
302 return;
303 }
304
305 mtu_info->ip6m_mtu = mtu;
306 mtu_info->ip6m_addr.sin6_family = AF_INET6;
307 mtu_info->ip6m_addr.sin6_port = 0;
308 mtu_info->ip6m_addr.sin6_flowinfo = 0;
309 mtu_info->ip6m_addr.sin6_scope_id = fl->oif;
310 ipv6_addr_copy(&mtu_info->ip6m_addr.sin6_addr, &ipv6_hdr(skb)->daddr);
311
312 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
313 skb_reset_transport_header(skb);
314
315 skb = xchg(&np->rxpmtu, skb);
316 kfree_skb(skb);
317 }
318
319 /*
320 * Handle MSG_ERRQUEUE
321 */
322 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
323 {
324 struct ipv6_pinfo *np = inet6_sk(sk);
325 struct sock_exterr_skb *serr;
326 struct sk_buff *skb, *skb2;
327 struct sockaddr_in6 *sin;
328 struct {
329 struct sock_extended_err ee;
330 struct sockaddr_in6 offender;
331 } errhdr;
332 int err;
333 int copied;
334
335 err = -EAGAIN;
336 skb = skb_dequeue(&sk->sk_error_queue);
337 if (skb == NULL)
338 goto out;
339
340 copied = skb->len;
341 if (copied > len) {
342 msg->msg_flags |= MSG_TRUNC;
343 copied = len;
344 }
345 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
346 if (err)
347 goto out_free_skb;
348
349 sock_recv_timestamp(msg, sk, skb);
350
351 serr = SKB_EXT_ERR(skb);
352
353 sin = (struct sockaddr_in6 *)msg->msg_name;
354 if (sin) {
355 const unsigned char *nh = skb_network_header(skb);
356 sin->sin6_family = AF_INET6;
357 sin->sin6_flowinfo = 0;
358 sin->sin6_port = serr->port;
359 sin->sin6_scope_id = 0;
360 if (skb->protocol == htons(ETH_P_IPV6)) {
361 ipv6_addr_copy(&sin->sin6_addr,
362 (struct in6_addr *)(nh + serr->addr_offset));
363 if (np->sndflow)
364 sin->sin6_flowinfo =
365 (*(__be32 *)(nh + serr->addr_offset - 24) &
366 IPV6_FLOWINFO_MASK);
367 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
368 sin->sin6_scope_id = IP6CB(skb)->iif;
369 } else {
370 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
371 &sin->sin6_addr);
372 }
373 }
374
375 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
376 sin = &errhdr.offender;
377 sin->sin6_family = AF_UNSPEC;
378 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
379 sin->sin6_family = AF_INET6;
380 sin->sin6_flowinfo = 0;
381 sin->sin6_scope_id = 0;
382 if (skb->protocol == htons(ETH_P_IPV6)) {
383 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
384 if (np->rxopt.all)
385 datagram_recv_ctl(sk, msg, skb);
386 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
387 sin->sin6_scope_id = IP6CB(skb)->iif;
388 } else {
389 struct inet_sock *inet = inet_sk(sk);
390
391 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
392 &sin->sin6_addr);
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 */
406 spin_lock_bh(&sk->sk_error_queue.lock);
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;
410 spin_unlock_bh(&sk->sk_error_queue.lock);
411 sk->sk_error_report(sk);
412 } else {
413 spin_unlock_bh(&sk->sk_error_queue.lock);
414 }
415
416 out_free_skb:
417 kfree_skb(skb);
418 out:
419 return err;
420 }
421
422 /*
423 * Handle IPV6_RECVPATHMTU
424 */
425 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
426 {
427 struct ipv6_pinfo *np = inet6_sk(sk);
428 struct sk_buff *skb;
429 struct sockaddr_in6 *sin;
430 struct ip6_mtuinfo mtu_info;
431 int err;
432 int copied;
433
434 err = -EAGAIN;
435 skb = xchg(&np->rxpmtu, NULL);
436 if (skb == NULL)
437 goto out;
438
439 copied = skb->len;
440 if (copied > len) {
441 msg->msg_flags |= MSG_TRUNC;
442 copied = len;
443 }
444 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
445 if (err)
446 goto out_free_skb;
447
448 sock_recv_timestamp(msg, sk, skb);
449
450 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
451
452 sin = (struct sockaddr_in6 *)msg->msg_name;
453 if (sin) {
454 sin->sin6_family = AF_INET6;
455 sin->sin6_flowinfo = 0;
456 sin->sin6_port = 0;
457 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
458 ipv6_addr_copy(&sin->sin6_addr, &mtu_info.ip6m_addr.sin6_addr);
459 }
460
461 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
462
463 err = copied;
464
465 out_free_skb:
466 kfree_skb(skb);
467 out:
468 return err;
469 }
470
471
472 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
473 {
474 struct ipv6_pinfo *np = inet6_sk(sk);
475 struct inet6_skb_parm *opt = IP6CB(skb);
476 unsigned char *nh = skb_network_header(skb);
477
478 if (np->rxopt.bits.rxinfo) {
479 struct in6_pktinfo src_info;
480
481 src_info.ipi6_ifindex = opt->iif;
482 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
483 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
484 }
485
486 if (np->rxopt.bits.rxhlim) {
487 int hlim = ipv6_hdr(skb)->hop_limit;
488 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
489 }
490
491 if (np->rxopt.bits.rxtclass) {
492 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
493 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
494 }
495
496 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
497 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
498 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
499 }
500
501 /* HbH is allowed only once */
502 if (np->rxopt.bits.hopopts && opt->hop) {
503 u8 *ptr = nh + opt->hop;
504 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
505 }
506
507 if (opt->lastopt &&
508 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
509 /*
510 * Silly enough, but we need to reparse in order to
511 * report extension headers (except for HbH)
512 * in order.
513 *
514 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
515 * (and WILL NOT be) defined because
516 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
517 */
518 unsigned int off = sizeof(struct ipv6hdr);
519 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
520
521 while (off <= opt->lastopt) {
522 unsigned len;
523 u8 *ptr = nh + off;
524
525 switch(nexthdr) {
526 case IPPROTO_DSTOPTS:
527 nexthdr = ptr[0];
528 len = (ptr[1] + 1) << 3;
529 if (np->rxopt.bits.dstopts)
530 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
531 break;
532 case IPPROTO_ROUTING:
533 nexthdr = ptr[0];
534 len = (ptr[1] + 1) << 3;
535 if (np->rxopt.bits.srcrt)
536 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
537 break;
538 case IPPROTO_AH:
539 nexthdr = ptr[0];
540 len = (ptr[1] + 2) << 2;
541 break;
542 default:
543 nexthdr = ptr[0];
544 len = (ptr[1] + 1) << 3;
545 break;
546 }
547
548 off += len;
549 }
550 }
551
552 /* socket options in old style */
553 if (np->rxopt.bits.rxoinfo) {
554 struct in6_pktinfo src_info;
555
556 src_info.ipi6_ifindex = opt->iif;
557 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
558 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
559 }
560 if (np->rxopt.bits.rxohlim) {
561 int hlim = ipv6_hdr(skb)->hop_limit;
562 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
563 }
564 if (np->rxopt.bits.ohopopts && opt->hop) {
565 u8 *ptr = nh + opt->hop;
566 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
567 }
568 if (np->rxopt.bits.odstopts && opt->dst0) {
569 u8 *ptr = nh + opt->dst0;
570 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
571 }
572 if (np->rxopt.bits.osrcrt && opt->srcrt) {
573 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
574 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
575 }
576 if (np->rxopt.bits.odstopts && opt->dst1) {
577 u8 *ptr = nh + opt->dst1;
578 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
579 }
580 if (np->rxopt.bits.rxorigdstaddr) {
581 struct sockaddr_in6 sin6;
582 u16 *ports = (u16 *) skb_transport_header(skb);
583
584 if (skb_transport_offset(skb) + 4 <= skb->len) {
585 /* All current transport protocols have the port numbers in the
586 * first four bytes of the transport header and this function is
587 * written with this assumption in mind.
588 */
589
590 sin6.sin6_family = AF_INET6;
591 ipv6_addr_copy(&sin6.sin6_addr, &ipv6_hdr(skb)->daddr);
592 sin6.sin6_port = ports[1];
593 sin6.sin6_flowinfo = 0;
594 sin6.sin6_scope_id = 0;
595
596 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
597 }
598 }
599 return 0;
600 }
601
602 int datagram_send_ctl(struct net *net,
603 struct msghdr *msg, struct flowi *fl,
604 struct ipv6_txoptions *opt,
605 int *hlimit, int *tclass, int *dontfrag)
606 {
607 struct in6_pktinfo *src_info;
608 struct cmsghdr *cmsg;
609 struct ipv6_rt_hdr *rthdr;
610 struct ipv6_opt_hdr *hdr;
611 int len;
612 int err = 0;
613
614 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
615 int addr_type;
616
617 if (!CMSG_OK(msg, cmsg)) {
618 err = -EINVAL;
619 goto exit_f;
620 }
621
622 if (cmsg->cmsg_level != SOL_IPV6)
623 continue;
624
625 switch (cmsg->cmsg_type) {
626 case IPV6_PKTINFO:
627 case IPV6_2292PKTINFO:
628 {
629 struct net_device *dev = NULL;
630
631 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
632 err = -EINVAL;
633 goto exit_f;
634 }
635
636 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
637
638 if (src_info->ipi6_ifindex) {
639 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
640 return -EINVAL;
641 fl->oif = src_info->ipi6_ifindex;
642 }
643
644 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
645
646 rcu_read_lock();
647 if (fl->oif) {
648 dev = dev_get_by_index_rcu(net, fl->oif);
649 if (!dev) {
650 rcu_read_unlock();
651 return -ENODEV;
652 }
653 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
654 rcu_read_unlock();
655 return -EINVAL;
656 }
657
658 if (addr_type != IPV6_ADDR_ANY) {
659 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
660 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
661 strict ? dev : NULL, 0))
662 err = -EINVAL;
663 else
664 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
665 }
666
667 rcu_read_unlock();
668
669 if (err)
670 goto exit_f;
671
672 break;
673 }
674
675 case IPV6_FLOWINFO:
676 if (cmsg->cmsg_len < CMSG_LEN(4)) {
677 err = -EINVAL;
678 goto exit_f;
679 }
680
681 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
682 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
683 err = -EINVAL;
684 goto exit_f;
685 }
686 }
687 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
688 break;
689
690 case IPV6_2292HOPOPTS:
691 case IPV6_HOPOPTS:
692 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
693 err = -EINVAL;
694 goto exit_f;
695 }
696
697 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
698 len = ((hdr->hdrlen + 1) << 3);
699 if (cmsg->cmsg_len < CMSG_LEN(len)) {
700 err = -EINVAL;
701 goto exit_f;
702 }
703 if (!capable(CAP_NET_RAW)) {
704 err = -EPERM;
705 goto exit_f;
706 }
707 opt->opt_nflen += len;
708 opt->hopopt = hdr;
709 break;
710
711 case IPV6_2292DSTOPTS:
712 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
713 err = -EINVAL;
714 goto exit_f;
715 }
716
717 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
718 len = ((hdr->hdrlen + 1) << 3);
719 if (cmsg->cmsg_len < CMSG_LEN(len)) {
720 err = -EINVAL;
721 goto exit_f;
722 }
723 if (!capable(CAP_NET_RAW)) {
724 err = -EPERM;
725 goto exit_f;
726 }
727 if (opt->dst1opt) {
728 err = -EINVAL;
729 goto exit_f;
730 }
731 opt->opt_flen += len;
732 opt->dst1opt = hdr;
733 break;
734
735 case IPV6_DSTOPTS:
736 case IPV6_RTHDRDSTOPTS:
737 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
738 err = -EINVAL;
739 goto exit_f;
740 }
741
742 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
743 len = ((hdr->hdrlen + 1) << 3);
744 if (cmsg->cmsg_len < CMSG_LEN(len)) {
745 err = -EINVAL;
746 goto exit_f;
747 }
748 if (!capable(CAP_NET_RAW)) {
749 err = -EPERM;
750 goto exit_f;
751 }
752 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
753 opt->opt_flen += len;
754 opt->dst1opt = hdr;
755 } else {
756 opt->opt_nflen += len;
757 opt->dst0opt = hdr;
758 }
759 break;
760
761 case IPV6_2292RTHDR:
762 case IPV6_RTHDR:
763 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
764 err = -EINVAL;
765 goto exit_f;
766 }
767
768 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
769
770 switch (rthdr->type) {
771 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
772 case IPV6_SRCRT_TYPE_2:
773 if (rthdr->hdrlen != 2 ||
774 rthdr->segments_left != 1) {
775 err = -EINVAL;
776 goto exit_f;
777 }
778 break;
779 #endif
780 default:
781 err = -EINVAL;
782 goto exit_f;
783 }
784
785 len = ((rthdr->hdrlen + 1) << 3);
786
787 if (cmsg->cmsg_len < CMSG_LEN(len)) {
788 err = -EINVAL;
789 goto exit_f;
790 }
791
792 /* segments left must also match */
793 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
794 err = -EINVAL;
795 goto exit_f;
796 }
797
798 opt->opt_nflen += len;
799 opt->srcrt = rthdr;
800
801 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
802 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
803
804 opt->opt_nflen += dsthdrlen;
805 opt->dst0opt = opt->dst1opt;
806 opt->dst1opt = NULL;
807 opt->opt_flen -= dsthdrlen;
808 }
809
810 break;
811
812 case IPV6_2292HOPLIMIT:
813 case IPV6_HOPLIMIT:
814 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
815 err = -EINVAL;
816 goto exit_f;
817 }
818
819 *hlimit = *(int *)CMSG_DATA(cmsg);
820 if (*hlimit < -1 || *hlimit > 0xff) {
821 err = -EINVAL;
822 goto exit_f;
823 }
824
825 break;
826
827 case IPV6_TCLASS:
828 {
829 int tc;
830
831 err = -EINVAL;
832 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
833 goto exit_f;
834 }
835
836 tc = *(int *)CMSG_DATA(cmsg);
837 if (tc < -1 || tc > 0xff)
838 goto exit_f;
839
840 err = 0;
841 *tclass = tc;
842
843 break;
844 }
845
846 case IPV6_DONTFRAG:
847 {
848 int df;
849
850 err = -EINVAL;
851 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
852 goto exit_f;
853 }
854
855 df = *(int *)CMSG_DATA(cmsg);
856 if (df < 0 || df > 1)
857 goto exit_f;
858
859 err = 0;
860 *dontfrag = df;
861
862 break;
863 }
864 default:
865 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
866 cmsg->cmsg_type);
867 err = -EINVAL;
868 goto exit_f;
869 }
870 }
871
872 exit_f:
873 return err;
874 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree