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USB: serial: add IDs for WinChipHead USB->RS232 adapter
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / datagram.c
blob0e3754a1237e530f60a12d82d7420787a84a9555
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 = 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_v4mapped(inet->inet_daddr, &np->daddr);
103
104 if (ipv6_addr_any(&np->saddr))
105 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
106
107 if (ipv6_addr_any(&np->rcv_saddr)) {
108 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
109 &np->rcv_saddr);
110 if (sk->sk_prot->rehash)
111 sk->sk_prot->rehash(sk);
112 }
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 }
127
128 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
129 sk->sk_bound_dev_if = np->mcast_oif;
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->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.mark = sk->sk_mark;
153 fl.fl_ip_dport = inet->inet_dport;
154 fl.fl_ip_sport = inet->inet_sport;
155
156 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
157 fl.oif = np->mcast_oif;
158
159 security_sk_classify_flow(sk, &fl);
160
161 if (flowlabel) {
162 if (flowlabel->opt && flowlabel->opt->srcrt) {
163 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
164 ipv6_addr_copy(&final, &fl.fl6_dst);
165 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
166 final_p = &final;
167 }
168 } else if (np->opt && np->opt->srcrt) {
169 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
170 ipv6_addr_copy(&final, &fl.fl6_dst);
171 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
172 final_p = &final;
173 }
174
175 err = ip6_dst_lookup(sk, &dst, &fl);
176 if (err)
177 goto out;
178 if (final_p)
179 ipv6_addr_copy(&fl.fl6_dst, final_p);
180
181 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
182 if (err < 0) {
183 if (err == -EREMOTE)
184 err = ip6_dst_blackhole(sk, &dst, &fl);
185 if (err < 0)
186 goto out;
187 }
188
189 /* source address lookup done in ip6_dst_lookup */
190
191 if (ipv6_addr_any(&np->saddr))
192 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
193
194 if (ipv6_addr_any(&np->rcv_saddr)) {
195 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
196 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
197 if (sk->sk_prot->rehash)
198 sk->sk_prot->rehash(sk);
199 }
200
201 ip6_dst_store(sk, dst,
202 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
203 &np->daddr : NULL,
204 #ifdef CONFIG_IPV6_SUBTREES
205 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
206 &np->saddr :
207 #endif
208 NULL);
209
210 sk->sk_state = TCP_ESTABLISHED;
211 out:
212 fl6_sock_release(flowlabel);
213 return err;
214 }
215
216 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
217 __be16 port, u32 info, u8 *payload)
218 {
219 struct ipv6_pinfo *np = inet6_sk(sk);
220 struct icmp6hdr *icmph = icmp6_hdr(skb);
221 struct sock_exterr_skb *serr;
222
223 if (!np->recverr)
224 return;
225
226 skb = skb_clone(skb, GFP_ATOMIC);
227 if (!skb)
228 return;
229
230 skb->protocol = htons(ETH_P_IPV6);
231
232 serr = SKB_EXT_ERR(skb);
233 serr->ee.ee_errno = err;
234 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
235 serr->ee.ee_type = icmph->icmp6_type;
236 serr->ee.ee_code = icmph->icmp6_code;
237 serr->ee.ee_pad = 0;
238 serr->ee.ee_info = info;
239 serr->ee.ee_data = 0;
240 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
241 skb_network_header(skb);
242 serr->port = port;
243
244 __skb_pull(skb, payload - skb->data);
245 skb_reset_transport_header(skb);
246
247 if (sock_queue_err_skb(sk, skb))
248 kfree_skb(skb);
249 }
250
251 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
252 {
253 struct ipv6_pinfo *np = inet6_sk(sk);
254 struct sock_exterr_skb *serr;
255 struct ipv6hdr *iph;
256 struct sk_buff *skb;
257
258 if (!np->recverr)
259 return;
260
261 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
262 if (!skb)
263 return;
264
265 skb->protocol = htons(ETH_P_IPV6);
266
267 skb_put(skb, sizeof(struct ipv6hdr));
268 skb_reset_network_header(skb);
269 iph = ipv6_hdr(skb);
270 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
271
272 serr = SKB_EXT_ERR(skb);
273 serr->ee.ee_errno = err;
274 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
275 serr->ee.ee_type = 0;
276 serr->ee.ee_code = 0;
277 serr->ee.ee_pad = 0;
278 serr->ee.ee_info = info;
279 serr->ee.ee_data = 0;
280 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
281 serr->port = fl->fl_ip_dport;
282
283 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
284 skb_reset_transport_header(skb);
285
286 if (sock_queue_err_skb(sk, skb))
287 kfree_skb(skb);
288 }
289
290 void ipv6_local_rxpmtu(struct sock *sk, struct flowi *fl, u32 mtu)
291 {
292 struct ipv6_pinfo *np = inet6_sk(sk);
293 struct ipv6hdr *iph;
294 struct sk_buff *skb;
295 struct ip6_mtuinfo *mtu_info;
296
297 if (!np->rxopt.bits.rxpmtu)
298 return;
299
300 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
301 if (!skb)
302 return;
303
304 skb_put(skb, sizeof(struct ipv6hdr));
305 skb_reset_network_header(skb);
306 iph = ipv6_hdr(skb);
307 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
308
309 mtu_info = IP6CBMTU(skb);
310 if (!mtu_info) {
311 kfree_skb(skb);
312 return;
313 }
314
315 mtu_info->ip6m_mtu = mtu;
316 mtu_info->ip6m_addr.sin6_family = AF_INET6;
317 mtu_info->ip6m_addr.sin6_port = 0;
318 mtu_info->ip6m_addr.sin6_flowinfo = 0;
319 mtu_info->ip6m_addr.sin6_scope_id = fl->oif;
320 ipv6_addr_copy(&mtu_info->ip6m_addr.sin6_addr, &ipv6_hdr(skb)->daddr);
321
322 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
323 skb_reset_transport_header(skb);
324
325 skb = xchg(&np->rxpmtu, skb);
326 kfree_skb(skb);
327 }
328
329 /*
330 * Handle MSG_ERRQUEUE
331 */
332 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
333 {
334 struct ipv6_pinfo *np = inet6_sk(sk);
335 struct sock_exterr_skb *serr;
336 struct sk_buff *skb, *skb2;
337 struct sockaddr_in6 *sin;
338 struct {
339 struct sock_extended_err ee;
340 struct sockaddr_in6 offender;
341 } errhdr;
342 int err;
343 int copied;
344
345 err = -EAGAIN;
346 skb = skb_dequeue(&sk->sk_error_queue);
347 if (skb == NULL)
348 goto out;
349
350 copied = skb->len;
351 if (copied > len) {
352 msg->msg_flags |= MSG_TRUNC;
353 copied = len;
354 }
355 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
356 if (err)
357 goto out_free_skb;
358
359 sock_recv_timestamp(msg, sk, skb);
360
361 serr = SKB_EXT_ERR(skb);
362
363 sin = (struct sockaddr_in6 *)msg->msg_name;
364 if (sin) {
365 const unsigned char *nh = skb_network_header(skb);
366 sin->sin6_family = AF_INET6;
367 sin->sin6_flowinfo = 0;
368 sin->sin6_port = serr->port;
369 sin->sin6_scope_id = 0;
370 if (skb->protocol == htons(ETH_P_IPV6)) {
371 ipv6_addr_copy(&sin->sin6_addr,
372 (struct in6_addr *)(nh + serr->addr_offset));
373 if (np->sndflow)
374 sin->sin6_flowinfo =
375 (*(__be32 *)(nh + serr->addr_offset - 24) &
376 IPV6_FLOWINFO_MASK);
377 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
378 sin->sin6_scope_id = IP6CB(skb)->iif;
379 } else {
380 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
381 &sin->sin6_addr);
382 }
383 }
384
385 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
386 sin = &errhdr.offender;
387 sin->sin6_family = AF_UNSPEC;
388 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
389 sin->sin6_family = AF_INET6;
390 sin->sin6_flowinfo = 0;
391 sin->sin6_scope_id = 0;
392 if (skb->protocol == htons(ETH_P_IPV6)) {
393 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
394 if (np->rxopt.all)
395 datagram_recv_ctl(sk, msg, skb);
396 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
397 sin->sin6_scope_id = IP6CB(skb)->iif;
398 } else {
399 struct inet_sock *inet = inet_sk(sk);
400
401 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
402 &sin->sin6_addr);
403 if (inet->cmsg_flags)
404 ip_cmsg_recv(msg, skb);
405 }
406 }
407
408 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
409
410 /* Now we could try to dump offended packet options */
411
412 msg->msg_flags |= MSG_ERRQUEUE;
413 err = copied;
414
415 /* Reset and regenerate socket error */
416 spin_lock_bh(&sk->sk_error_queue.lock);
417 sk->sk_err = 0;
418 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
419 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
420 spin_unlock_bh(&sk->sk_error_queue.lock);
421 sk->sk_error_report(sk);
422 } else {
423 spin_unlock_bh(&sk->sk_error_queue.lock);
424 }
425
426 out_free_skb:
427 kfree_skb(skb);
428 out:
429 return err;
430 }
431
432 /*
433 * Handle IPV6_RECVPATHMTU
434 */
435 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
436 {
437 struct ipv6_pinfo *np = inet6_sk(sk);
438 struct sk_buff *skb;
439 struct sockaddr_in6 *sin;
440 struct ip6_mtuinfo mtu_info;
441 int err;
442 int copied;
443
444 err = -EAGAIN;
445 skb = xchg(&np->rxpmtu, NULL);
446 if (skb == NULL)
447 goto out;
448
449 copied = skb->len;
450 if (copied > len) {
451 msg->msg_flags |= MSG_TRUNC;
452 copied = len;
453 }
454 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
455 if (err)
456 goto out_free_skb;
457
458 sock_recv_timestamp(msg, sk, skb);
459
460 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
461
462 sin = (struct sockaddr_in6 *)msg->msg_name;
463 if (sin) {
464 sin->sin6_family = AF_INET6;
465 sin->sin6_flowinfo = 0;
466 sin->sin6_port = 0;
467 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
468 ipv6_addr_copy(&sin->sin6_addr, &mtu_info.ip6m_addr.sin6_addr);
469 }
470
471 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
472
473 err = copied;
474
475 out_free_skb:
476 kfree_skb(skb);
477 out:
478 return err;
479 }
480
481
482 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
483 {
484 struct ipv6_pinfo *np = inet6_sk(sk);
485 struct inet6_skb_parm *opt = IP6CB(skb);
486 unsigned char *nh = skb_network_header(skb);
487
488 if (np->rxopt.bits.rxinfo) {
489 struct in6_pktinfo src_info;
490
491 src_info.ipi6_ifindex = opt->iif;
492 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
493 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
494 }
495
496 if (np->rxopt.bits.rxhlim) {
497 int hlim = ipv6_hdr(skb)->hop_limit;
498 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
499 }
500
501 if (np->rxopt.bits.rxtclass) {
502 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
503 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
504 }
505
506 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
507 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
508 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
509 }
510
511 /* HbH is allowed only once */
512 if (np->rxopt.bits.hopopts && opt->hop) {
513 u8 *ptr = nh + opt->hop;
514 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
515 }
516
517 if (opt->lastopt &&
518 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
519 /*
520 * Silly enough, but we need to reparse in order to
521 * report extension headers (except for HbH)
522 * in order.
523 *
524 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
525 * (and WILL NOT be) defined because
526 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
527 */
528 unsigned int off = sizeof(struct ipv6hdr);
529 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
530
531 while (off <= opt->lastopt) {
532 unsigned len;
533 u8 *ptr = nh + off;
534
535 switch(nexthdr) {
536 case IPPROTO_DSTOPTS:
537 nexthdr = ptr[0];
538 len = (ptr[1] + 1) << 3;
539 if (np->rxopt.bits.dstopts)
540 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
541 break;
542 case IPPROTO_ROUTING:
543 nexthdr = ptr[0];
544 len = (ptr[1] + 1) << 3;
545 if (np->rxopt.bits.srcrt)
546 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
547 break;
548 case IPPROTO_AH:
549 nexthdr = ptr[0];
550 len = (ptr[1] + 2) << 2;
551 break;
552 default:
553 nexthdr = ptr[0];
554 len = (ptr[1] + 1) << 3;
555 break;
556 }
557
558 off += len;
559 }
560 }
561
562 /* socket options in old style */
563 if (np->rxopt.bits.rxoinfo) {
564 struct in6_pktinfo src_info;
565
566 src_info.ipi6_ifindex = opt->iif;
567 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
568 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
569 }
570 if (np->rxopt.bits.rxohlim) {
571 int hlim = ipv6_hdr(skb)->hop_limit;
572 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
573 }
574 if (np->rxopt.bits.ohopopts && opt->hop) {
575 u8 *ptr = nh + opt->hop;
576 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
577 }
578 if (np->rxopt.bits.odstopts && opt->dst0) {
579 u8 *ptr = nh + opt->dst0;
580 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
581 }
582 if (np->rxopt.bits.osrcrt && opt->srcrt) {
583 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
584 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
585 }
586 if (np->rxopt.bits.odstopts && opt->dst1) {
587 u8 *ptr = nh + opt->dst1;
588 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
589 }
590 return 0;
591 }
592
593 int datagram_send_ctl(struct net *net,
594 struct msghdr *msg, struct flowi *fl,
595 struct ipv6_txoptions *opt,
596 int *hlimit, int *tclass, int *dontfrag)
597 {
598 struct in6_pktinfo *src_info;
599 struct cmsghdr *cmsg;
600 struct ipv6_rt_hdr *rthdr;
601 struct ipv6_opt_hdr *hdr;
602 int len;
603 int err = 0;
604
605 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
606 int addr_type;
607
608 if (!CMSG_OK(msg, cmsg)) {
609 err = -EINVAL;
610 goto exit_f;
611 }
612
613 if (cmsg->cmsg_level != SOL_IPV6)
614 continue;
615
616 switch (cmsg->cmsg_type) {
617 case IPV6_PKTINFO:
618 case IPV6_2292PKTINFO:
619 {
620 struct net_device *dev = NULL;
621
622 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
623 err = -EINVAL;
624 goto exit_f;
625 }
626
627 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
628
629 if (src_info->ipi6_ifindex) {
630 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
631 return -EINVAL;
632 fl->oif = src_info->ipi6_ifindex;
633 }
634
635 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
636
637 rcu_read_lock();
638 if (fl->oif) {
639 dev = dev_get_by_index_rcu(net, fl->oif);
640 if (!dev) {
641 rcu_read_unlock();
642 return -ENODEV;
643 }
644 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
645 rcu_read_unlock();
646 return -EINVAL;
647 }
648
649 if (addr_type != IPV6_ADDR_ANY) {
650 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
651 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
652 strict ? dev : NULL, 0))
653 err = -EINVAL;
654 else
655 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
656 }
657
658 rcu_read_unlock();
659
660 if (err)
661 goto exit_f;
662
663 break;
664 }
665
666 case IPV6_FLOWINFO:
667 if (cmsg->cmsg_len < CMSG_LEN(4)) {
668 err = -EINVAL;
669 goto exit_f;
670 }
671
672 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
673 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
674 err = -EINVAL;
675 goto exit_f;
676 }
677 }
678 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
679 break;
680
681 case IPV6_2292HOPOPTS:
682 case IPV6_HOPOPTS:
683 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
684 err = -EINVAL;
685 goto exit_f;
686 }
687
688 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
689 len = ((hdr->hdrlen + 1) << 3);
690 if (cmsg->cmsg_len < CMSG_LEN(len)) {
691 err = -EINVAL;
692 goto exit_f;
693 }
694 if (!capable(CAP_NET_RAW)) {
695 err = -EPERM;
696 goto exit_f;
697 }
698 opt->opt_nflen += len;
699 opt->hopopt = hdr;
700 break;
701
702 case IPV6_2292DSTOPTS:
703 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
704 err = -EINVAL;
705 goto exit_f;
706 }
707
708 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
709 len = ((hdr->hdrlen + 1) << 3);
710 if (cmsg->cmsg_len < CMSG_LEN(len)) {
711 err = -EINVAL;
712 goto exit_f;
713 }
714 if (!capable(CAP_NET_RAW)) {
715 err = -EPERM;
716 goto exit_f;
717 }
718 if (opt->dst1opt) {
719 err = -EINVAL;
720 goto exit_f;
721 }
722 opt->opt_flen += len;
723 opt->dst1opt = hdr;
724 break;
725
726 case IPV6_DSTOPTS:
727 case IPV6_RTHDRDSTOPTS:
728 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
729 err = -EINVAL;
730 goto exit_f;
731 }
732
733 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
734 len = ((hdr->hdrlen + 1) << 3);
735 if (cmsg->cmsg_len < CMSG_LEN(len)) {
736 err = -EINVAL;
737 goto exit_f;
738 }
739 if (!capable(CAP_NET_RAW)) {
740 err = -EPERM;
741 goto exit_f;
742 }
743 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
744 opt->opt_flen += len;
745 opt->dst1opt = hdr;
746 } else {
747 opt->opt_nflen += len;
748 opt->dst0opt = hdr;
749 }
750 break;
751
752 case IPV6_2292RTHDR:
753 case IPV6_RTHDR:
754 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
755 err = -EINVAL;
756 goto exit_f;
757 }
758
759 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
760
761 switch (rthdr->type) {
762 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
763 case IPV6_SRCRT_TYPE_2:
764 if (rthdr->hdrlen != 2 ||
765 rthdr->segments_left != 1) {
766 err = -EINVAL;
767 goto exit_f;
768 }
769 break;
770 #endif
771 default:
772 err = -EINVAL;
773 goto exit_f;
774 }
775
776 len = ((rthdr->hdrlen + 1) << 3);
777
778 if (cmsg->cmsg_len < CMSG_LEN(len)) {
779 err = -EINVAL;
780 goto exit_f;
781 }
782
783 /* segments left must also match */
784 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
785 err = -EINVAL;
786 goto exit_f;
787 }
788
789 opt->opt_nflen += len;
790 opt->srcrt = rthdr;
791
792 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
793 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
794
795 opt->opt_nflen += dsthdrlen;
796 opt->dst0opt = opt->dst1opt;
797 opt->dst1opt = NULL;
798 opt->opt_flen -= dsthdrlen;
799 }
800
801 break;
802
803 case IPV6_2292HOPLIMIT:
804 case IPV6_HOPLIMIT:
805 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
806 err = -EINVAL;
807 goto exit_f;
808 }
809
810 *hlimit = *(int *)CMSG_DATA(cmsg);
811 if (*hlimit < -1 || *hlimit > 0xff) {
812 err = -EINVAL;
813 goto exit_f;
814 }
815
816 break;
817
818 case IPV6_TCLASS:
819 {
820 int tc;
821
822 err = -EINVAL;
823 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
824 goto exit_f;
825 }
826
827 tc = *(int *)CMSG_DATA(cmsg);
828 if (tc < -1 || tc > 0xff)
829 goto exit_f;
830
831 err = 0;
832 *tclass = tc;
833
834 break;
835 }
836
837 case IPV6_DONTFRAG:
838 {
839 int df;
840
841 err = -EINVAL;
842 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
843 goto exit_f;
844 }
845
846 df = *(int *)CMSG_DATA(cmsg);
847 if (df < 0 || df > 1)
848 goto exit_f;
849
850 err = 0;
851 *dontfrag = df;
852
853 break;
854 }
855 default:
856 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
857 cmsg->cmsg_type);
858 err = -EINVAL;
859 goto exit_f;
860 }
861 }
862
863 exit_f:
864 return err;
865 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree