[ALSA] es1688 - Use platform_device
[linux-2.6] / net / ipv6 / datagram.c
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 #include <net/tcp_states.h>
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                 goto out;
180
181         /* source address lookup done in ip6_dst_lookup */
182
183         if (ipv6_addr_any(&np->saddr))
184                 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
185
186         if (ipv6_addr_any(&np->rcv_saddr)) {
187                 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
188                 inet->rcv_saddr = LOOPBACK4_IPV6;
189         }
190
191         ip6_dst_store(sk, dst,
192                       ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
193                       &np->daddr : NULL);
194
195         sk->sk_state = TCP_ESTABLISHED;
196 out:
197         fl6_sock_release(flowlabel);
198         return err;
199 }
200
201 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 
202                      u16 port, u32 info, u8 *payload)
203 {
204         struct ipv6_pinfo *np  = inet6_sk(sk);
205         struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
206         struct sock_exterr_skb *serr;
207
208         if (!np->recverr)
209                 return;
210
211         skb = skb_clone(skb, GFP_ATOMIC);
212         if (!skb)
213                 return;
214
215         serr = SKB_EXT_ERR(skb);
216         serr->ee.ee_errno = err;
217         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
218         serr->ee.ee_type = icmph->icmp6_type; 
219         serr->ee.ee_code = icmph->icmp6_code;
220         serr->ee.ee_pad = 0;
221         serr->ee.ee_info = info;
222         serr->ee.ee_data = 0;
223         serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
224         serr->port = port;
225
226         skb->h.raw = payload;
227         __skb_pull(skb, payload - skb->data);
228
229         if (sock_queue_err_skb(sk, skb))
230                 kfree_skb(skb);
231 }
232
233 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
234 {
235         struct ipv6_pinfo *np = inet6_sk(sk);
236         struct sock_exterr_skb *serr;
237         struct ipv6hdr *iph;
238         struct sk_buff *skb;
239
240         if (!np->recverr)
241                 return;
242
243         skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
244         if (!skb)
245                 return;
246
247         iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
248         skb->nh.ipv6h = iph;
249         ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
250
251         serr = SKB_EXT_ERR(skb);
252         serr->ee.ee_errno = err;
253         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
254         serr->ee.ee_type = 0; 
255         serr->ee.ee_code = 0;
256         serr->ee.ee_pad = 0;
257         serr->ee.ee_info = info;
258         serr->ee.ee_data = 0;
259         serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
260         serr->port = fl->fl_ip_dport;
261
262         skb->h.raw = skb->tail;
263         __skb_pull(skb, skb->tail - skb->data);
264
265         if (sock_queue_err_skb(sk, skb))
266                 kfree_skb(skb);
267 }
268
269 /* 
270  *      Handle MSG_ERRQUEUE
271  */
272 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
273 {
274         struct ipv6_pinfo *np = inet6_sk(sk);
275         struct sock_exterr_skb *serr;
276         struct sk_buff *skb, *skb2;
277         struct sockaddr_in6 *sin;
278         struct {
279                 struct sock_extended_err ee;
280                 struct sockaddr_in6      offender;
281         } errhdr;
282         int err;
283         int copied;
284
285         err = -EAGAIN;
286         skb = skb_dequeue(&sk->sk_error_queue);
287         if (skb == NULL)
288                 goto out;
289
290         copied = skb->len;
291         if (copied > len) {
292                 msg->msg_flags |= MSG_TRUNC;
293                 copied = len;
294         }
295         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
296         if (err)
297                 goto out_free_skb;
298
299         sock_recv_timestamp(msg, sk, skb);
300
301         serr = SKB_EXT_ERR(skb);
302
303         sin = (struct sockaddr_in6 *)msg->msg_name;
304         if (sin) {
305                 sin->sin6_family = AF_INET6;
306                 sin->sin6_flowinfo = 0;
307                 sin->sin6_port = serr->port; 
308                 sin->sin6_scope_id = 0;
309                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
310                         ipv6_addr_copy(&sin->sin6_addr,
311                           (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
312                         if (np->sndflow)
313                                 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
314                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
315                                 sin->sin6_scope_id = IP6CB(skb)->iif;
316                 } else {
317                         ipv6_addr_set(&sin->sin6_addr, 0, 0,
318                                       htonl(0xffff),
319                                       *(u32*)(skb->nh.raw + serr->addr_offset));
320                 }
321         }
322
323         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
324         sin = &errhdr.offender;
325         sin->sin6_family = AF_UNSPEC;
326         if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
327                 sin->sin6_family = AF_INET6;
328                 sin->sin6_flowinfo = 0;
329                 sin->sin6_scope_id = 0;
330                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
331                         ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
332                         if (np->rxopt.all)
333                                 datagram_recv_ctl(sk, msg, skb);
334                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
335                                 sin->sin6_scope_id = IP6CB(skb)->iif;
336                 } else {
337                         struct inet_sock *inet = inet_sk(sk);
338
339                         ipv6_addr_set(&sin->sin6_addr, 0, 0,
340                                       htonl(0xffff),
341                                       skb->nh.iph->saddr);
342                         if (inet->cmsg_flags)
343                                 ip_cmsg_recv(msg, skb);
344                 }
345         }
346
347         put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
348
349         /* Now we could try to dump offended packet options */
350
351         msg->msg_flags |= MSG_ERRQUEUE;
352         err = copied;
353
354         /* Reset and regenerate socket error */
355         spin_lock_bh(&sk->sk_error_queue.lock);
356         sk->sk_err = 0;
357         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
358                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
359                 spin_unlock_bh(&sk->sk_error_queue.lock);
360                 sk->sk_error_report(sk);
361         } else {
362                 spin_unlock_bh(&sk->sk_error_queue.lock);
363         }
364
365 out_free_skb:   
366         kfree_skb(skb);
367 out:
368         return err;
369 }
370
371
372
373 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
374 {
375         struct ipv6_pinfo *np = inet6_sk(sk);
376         struct inet6_skb_parm *opt = IP6CB(skb);
377
378         if (np->rxopt.bits.rxinfo) {
379                 struct in6_pktinfo src_info;
380
381                 src_info.ipi6_ifindex = opt->iif;
382                 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
383                 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
384         }
385
386         if (np->rxopt.bits.rxhlim) {
387                 int hlim = skb->nh.ipv6h->hop_limit;
388                 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
389         }
390
391         if (np->rxopt.bits.rxtclass) {
392                 int tclass = (ntohl(*(u32 *)skb->nh.ipv6h) >> 20) & 0xff;
393                 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
394         }
395
396         if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
397                 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
398                 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
399         }
400
401         /* HbH is allowed only once */
402         if (np->rxopt.bits.hopopts && opt->hop) {
403                 u8 *ptr = skb->nh.raw + opt->hop;
404                 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
405         }
406
407         if (opt->lastopt &&
408             (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
409                 /*
410                  * Silly enough, but we need to reparse in order to
411                  * report extension headers (except for HbH)
412                  * in order.
413                  *
414                  * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 
415                  * (and WILL NOT be) defined because
416                  * IPV6_RECVDSTOPTS is more generic. --yoshfuji
417                  */
418                 unsigned int off = sizeof(struct ipv6hdr);
419                 u8 nexthdr = skb->nh.ipv6h->nexthdr;
420
421                 while (off <= opt->lastopt) {
422                         unsigned len;
423                         u8 *ptr = skb->nh.raw + off;
424
425                         switch(nexthdr) {
426                         case IPPROTO_DSTOPTS:
427                                 nexthdr = ptr[0];
428                                 len = (ptr[1] + 1) << 3;
429                                 if (np->rxopt.bits.dstopts)
430                                         put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
431                                 break;
432                         case IPPROTO_ROUTING:
433                                 nexthdr = ptr[0];
434                                 len = (ptr[1] + 1) << 3;
435                                 if (np->rxopt.bits.srcrt)
436                                         put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
437                                 break;
438                         case IPPROTO_AH:
439                                 nexthdr = ptr[0];
440                                 len = (ptr[1] + 2) << 2;
441                                 break;
442                         default:
443                                 nexthdr = ptr[0];
444                                 len = (ptr[1] + 1) << 3;
445                                 break;
446                         }
447
448                         off += len;
449                 }
450         }
451
452         /* socket options in old style */
453         if (np->rxopt.bits.rxoinfo) {
454                 struct in6_pktinfo src_info;
455
456                 src_info.ipi6_ifindex = opt->iif;
457                 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
458                 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
459         }
460         if (np->rxopt.bits.rxohlim) {
461                 int hlim = skb->nh.ipv6h->hop_limit;
462                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
463         }
464         if (np->rxopt.bits.ohopopts && opt->hop) {
465                 u8 *ptr = skb->nh.raw + opt->hop;
466                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
467         }
468         if (np->rxopt.bits.odstopts && opt->dst0) {
469                 u8 *ptr = skb->nh.raw + opt->dst0;
470                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
471         }
472         if (np->rxopt.bits.osrcrt && opt->srcrt) {
473                 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
474                 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
475         }
476         if (np->rxopt.bits.odstopts && opt->dst1) {
477                 u8 *ptr = skb->nh.raw + opt->dst1;
478                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
479         }
480         return 0;
481 }
482
483 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
484                       struct ipv6_txoptions *opt,
485                       int *hlimit, int *tclass)
486 {
487         struct in6_pktinfo *src_info;
488         struct cmsghdr *cmsg;
489         struct ipv6_rt_hdr *rthdr;
490         struct ipv6_opt_hdr *hdr;
491         int len;
492         int err = 0;
493
494         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
495                 int addr_type;
496                 struct net_device *dev = NULL;
497
498                 if (!CMSG_OK(msg, cmsg)) {
499                         err = -EINVAL;
500                         goto exit_f;
501                 }
502
503                 if (cmsg->cmsg_level != SOL_IPV6)
504                         continue;
505
506                 switch (cmsg->cmsg_type) {
507                 case IPV6_PKTINFO:
508                 case IPV6_2292PKTINFO:
509                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
510                                 err = -EINVAL;
511                                 goto exit_f;
512                         }
513
514                         src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
515                         
516                         if (src_info->ipi6_ifindex) {
517                                 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
518                                         return -EINVAL;
519                                 fl->oif = src_info->ipi6_ifindex;
520                         }
521
522                         addr_type = ipv6_addr_type(&src_info->ipi6_addr);
523
524                         if (addr_type == IPV6_ADDR_ANY)
525                                 break;
526                         
527                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
528                                 if (!src_info->ipi6_ifindex)
529                                         return -EINVAL;
530                                 else {
531                                         dev = dev_get_by_index(src_info->ipi6_ifindex);
532                                         if (!dev)
533                                                 return -ENODEV;
534                                 }
535                         }
536                         if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
537                                 if (dev)
538                                         dev_put(dev);
539                                 err = -EINVAL;
540                                 goto exit_f;
541                         }
542                         if (dev)
543                                 dev_put(dev);
544
545                         ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
546                         break;
547
548                 case IPV6_FLOWINFO:
549                         if (cmsg->cmsg_len < CMSG_LEN(4)) {
550                                 err = -EINVAL;
551                                 goto exit_f;
552                         }
553
554                         if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
555                                 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
556                                         err = -EINVAL;
557                                         goto exit_f;
558                                 }
559                         }
560                         fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
561                         break;
562
563                 case IPV6_2292HOPOPTS:
564                 case IPV6_HOPOPTS:
565                         if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
566                                 err = -EINVAL;
567                                 goto exit_f;
568                         }
569
570                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
571                         len = ((hdr->hdrlen + 1) << 3);
572                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
573                                 err = -EINVAL;
574                                 goto exit_f;
575                         }
576                         if (!capable(CAP_NET_RAW)) {
577                                 err = -EPERM;
578                                 goto exit_f;
579                         }
580                         opt->opt_nflen += len;
581                         opt->hopopt = hdr;
582                         break;
583
584                 case IPV6_2292DSTOPTS:
585                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
586                                 err = -EINVAL;
587                                 goto exit_f;
588                         }
589
590                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
591                         len = ((hdr->hdrlen + 1) << 3);
592                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
593                                 err = -EINVAL;
594                                 goto exit_f;
595                         }
596                         if (!capable(CAP_NET_RAW)) {
597                                 err = -EPERM;
598                                 goto exit_f;
599                         }
600                         if (opt->dst1opt) {
601                                 err = -EINVAL;
602                                 goto exit_f;
603                         }
604                         opt->opt_flen += len;
605                         opt->dst1opt = hdr;
606                         break;
607
608                 case IPV6_DSTOPTS:
609                 case IPV6_RTHDRDSTOPTS:
610                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
611                                 err = -EINVAL;
612                                 goto exit_f;
613                         }
614
615                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
616                         len = ((hdr->hdrlen + 1) << 3);
617                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
618                                 err = -EINVAL;
619                                 goto exit_f;
620                         }
621                         if (!capable(CAP_NET_RAW)) {
622                                 err = -EPERM;
623                                 goto exit_f;
624                         }
625                         if (cmsg->cmsg_type == IPV6_DSTOPTS) {
626                                 opt->opt_flen += len;
627                                 opt->dst1opt = hdr;
628                         } else {
629                                 opt->opt_nflen += len;
630                                 opt->dst0opt = hdr;
631                         }
632                         break;
633
634                 case IPV6_2292RTHDR:
635                 case IPV6_RTHDR:
636                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
637                                 err = -EINVAL;
638                                 goto exit_f;
639                         }
640
641                         rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
642
643                         /*
644                          *      TYPE 0
645                          */
646                         if (rthdr->type) {
647                                 err = -EINVAL;
648                                 goto exit_f;
649                         }
650
651                         len = ((rthdr->hdrlen + 1) << 3);
652
653                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
654                                 err = -EINVAL;
655                                 goto exit_f;
656                         }
657
658                         /* segments left must also match */
659                         if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
660                                 err = -EINVAL;
661                                 goto exit_f;
662                         }
663
664                         opt->opt_nflen += len;
665                         opt->srcrt = rthdr;
666
667                         if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
668                                 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
669
670                                 opt->opt_nflen += dsthdrlen;
671                                 opt->dst0opt = opt->dst1opt;
672                                 opt->dst1opt = NULL;
673                                 opt->opt_flen -= dsthdrlen;
674                         }
675
676                         break;
677
678                 case IPV6_2292HOPLIMIT:
679                 case IPV6_HOPLIMIT:
680                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
681                                 err = -EINVAL;
682                                 goto exit_f;
683                         }
684
685                         *hlimit = *(int *)CMSG_DATA(cmsg);
686                         break;
687
688                 case IPV6_TCLASS:
689                     {
690                         int tc;
691
692                         err = -EINVAL;
693                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
694                                 goto exit_f;
695                         }
696
697                         tc = *(int *)CMSG_DATA(cmsg);
698                         if (tc < 0 || tc > 0xff)
699                                 goto exit_f;
700
701                         err = 0;
702                         *tclass = tc;
703
704                         break;
705                     }
706                 default:
707                         LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
708                                        cmsg->cmsg_type);
709                         err = -EINVAL;
710                         break;
711                 };
712         }
713
714 exit_f:
715         return err;
716 }