include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-3.10.git] / 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  *      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
111                 goto out;
112         }
113
114         if (addr_type&IPV6_ADDR_LINKLOCAL) {
115                 if (addr_len >= sizeof(struct sockaddr_in6) &&
116                     usin->sin6_scope_id) {
117                         if (sk->sk_bound_dev_if &&
118                             sk->sk_bound_dev_if != usin->sin6_scope_id) {
119                                 err = -EINVAL;
120                                 goto out;
121                         }
122                         sk->sk_bound_dev_if = usin->sin6_scope_id;
123                 }
124
125                 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
126                         sk->sk_bound_dev_if = np->mcast_oif;
127
128                 /* Connect to link-local address requires an interface */
129                 if (!sk->sk_bound_dev_if) {
130                         err = -EINVAL;
131                         goto out;
132                 }
133         }
134
135         ipv6_addr_copy(&np->daddr, daddr);
136         np->flow_label = fl.fl6_flowlabel;
137
138         inet->inet_dport = usin->sin6_port;
139
140         /*
141          *      Check for a route to destination an obtain the
142          *      destination cache for it.
143          */
144
145         fl.proto = sk->sk_protocol;
146         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
147         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
148         fl.oif = sk->sk_bound_dev_if;
149         fl.mark = sk->sk_mark;
150         fl.fl_ip_dport = inet->inet_dport;
151         fl.fl_ip_sport = inet->inet_sport;
152
153         if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
154                 fl.oif = np->mcast_oif;
155
156         security_sk_classify_flow(sk, &fl);
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         err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
179         if (err < 0) {
180                 if (err == -EREMOTE)
181                         err = ip6_dst_blackhole(sk, &dst, &fl);
182                 if (err < 0)
183                         goto out;
184         }
185
186         /* source address lookup done in ip6_dst_lookup */
187
188         if (ipv6_addr_any(&np->saddr))
189                 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
190
191         if (ipv6_addr_any(&np->rcv_saddr)) {
192                 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
193                 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
194         }
195
196         ip6_dst_store(sk, dst,
197                       ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
198                       &np->daddr : NULL,
199 #ifdef CONFIG_IPV6_SUBTREES
200                       ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
201                       &np->saddr :
202 #endif
203                       NULL);
204
205         sk->sk_state = TCP_ESTABLISHED;
206 out:
207         fl6_sock_release(flowlabel);
208         return err;
209 }
210
211 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
212                      __be16 port, u32 info, u8 *payload)
213 {
214         struct ipv6_pinfo *np  = inet6_sk(sk);
215         struct icmp6hdr *icmph = icmp6_hdr(skb);
216         struct sock_exterr_skb *serr;
217
218         if (!np->recverr)
219                 return;
220
221         skb = skb_clone(skb, GFP_ATOMIC);
222         if (!skb)
223                 return;
224
225         serr = SKB_EXT_ERR(skb);
226         serr->ee.ee_errno = err;
227         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
228         serr->ee.ee_type = icmph->icmp6_type;
229         serr->ee.ee_code = icmph->icmp6_code;
230         serr->ee.ee_pad = 0;
231         serr->ee.ee_info = info;
232         serr->ee.ee_data = 0;
233         serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
234                                   skb_network_header(skb);
235         serr->port = port;
236
237         __skb_pull(skb, payload - skb->data);
238         skb_reset_transport_header(skb);
239
240         if (sock_queue_err_skb(sk, skb))
241                 kfree_skb(skb);
242 }
243
244 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
245 {
246         struct ipv6_pinfo *np = inet6_sk(sk);
247         struct sock_exterr_skb *serr;
248         struct ipv6hdr *iph;
249         struct sk_buff *skb;
250
251         if (!np->recverr)
252                 return;
253
254         skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
255         if (!skb)
256                 return;
257
258         skb_put(skb, sizeof(struct ipv6hdr));
259         skb_reset_network_header(skb);
260         iph = ipv6_hdr(skb);
261         ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
262
263         serr = SKB_EXT_ERR(skb);
264         serr->ee.ee_errno = err;
265         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
266         serr->ee.ee_type = 0;
267         serr->ee.ee_code = 0;
268         serr->ee.ee_pad = 0;
269         serr->ee.ee_info = info;
270         serr->ee.ee_data = 0;
271         serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
272         serr->port = fl->fl_ip_dport;
273
274         __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
275         skb_reset_transport_header(skb);
276
277         if (sock_queue_err_skb(sk, skb))
278                 kfree_skb(skb);
279 }
280
281 /*
282  *      Handle MSG_ERRQUEUE
283  */
284 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
285 {
286         struct ipv6_pinfo *np = inet6_sk(sk);
287         struct sock_exterr_skb *serr;
288         struct sk_buff *skb, *skb2;
289         struct sockaddr_in6 *sin;
290         struct {
291                 struct sock_extended_err ee;
292                 struct sockaddr_in6      offender;
293         } errhdr;
294         int err;
295         int copied;
296
297         err = -EAGAIN;
298         skb = skb_dequeue(&sk->sk_error_queue);
299         if (skb == NULL)
300                 goto out;
301
302         copied = skb->len;
303         if (copied > len) {
304                 msg->msg_flags |= MSG_TRUNC;
305                 copied = len;
306         }
307         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
308         if (err)
309                 goto out_free_skb;
310
311         sock_recv_timestamp(msg, sk, skb);
312
313         serr = SKB_EXT_ERR(skb);
314
315         sin = (struct sockaddr_in6 *)msg->msg_name;
316         if (sin) {
317                 const unsigned char *nh = skb_network_header(skb);
318                 sin->sin6_family = AF_INET6;
319                 sin->sin6_flowinfo = 0;
320                 sin->sin6_port = serr->port;
321                 sin->sin6_scope_id = 0;
322                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
323                         ipv6_addr_copy(&sin->sin6_addr,
324                                   (struct in6_addr *)(nh + serr->addr_offset));
325                         if (np->sndflow)
326                                 sin->sin6_flowinfo =
327                                         (*(__be32 *)(nh + serr->addr_offset - 24) &
328                                          IPV6_FLOWINFO_MASK);
329                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
330                                 sin->sin6_scope_id = IP6CB(skb)->iif;
331                 } else {
332                         ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
333                                                &sin->sin6_addr);
334                 }
335         }
336
337         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
338         sin = &errhdr.offender;
339         sin->sin6_family = AF_UNSPEC;
340         if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
341                 sin->sin6_family = AF_INET6;
342                 sin->sin6_flowinfo = 0;
343                 sin->sin6_scope_id = 0;
344                 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
345                         ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
346                         if (np->rxopt.all)
347                                 datagram_recv_ctl(sk, msg, skb);
348                         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
349                                 sin->sin6_scope_id = IP6CB(skb)->iif;
350                 } else {
351                         struct inet_sock *inet = inet_sk(sk);
352
353                         ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
354                                                &sin->sin6_addr);
355                         if (inet->cmsg_flags)
356                                 ip_cmsg_recv(msg, skb);
357                 }
358         }
359
360         put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
361
362         /* Now we could try to dump offended packet options */
363
364         msg->msg_flags |= MSG_ERRQUEUE;
365         err = copied;
366
367         /* Reset and regenerate socket error */
368         spin_lock_bh(&sk->sk_error_queue.lock);
369         sk->sk_err = 0;
370         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
371                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
372                 spin_unlock_bh(&sk->sk_error_queue.lock);
373                 sk->sk_error_report(sk);
374         } else {
375                 spin_unlock_bh(&sk->sk_error_queue.lock);
376         }
377
378 out_free_skb:
379         kfree_skb(skb);
380 out:
381         return err;
382 }
383
384
385
386 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
387 {
388         struct ipv6_pinfo *np = inet6_sk(sk);
389         struct inet6_skb_parm *opt = IP6CB(skb);
390         unsigned char *nh = skb_network_header(skb);
391
392         if (np->rxopt.bits.rxinfo) {
393                 struct in6_pktinfo src_info;
394
395                 src_info.ipi6_ifindex = opt->iif;
396                 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
397                 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
398         }
399
400         if (np->rxopt.bits.rxhlim) {
401                 int hlim = ipv6_hdr(skb)->hop_limit;
402                 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
403         }
404
405         if (np->rxopt.bits.rxtclass) {
406                 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
407                 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
408         }
409
410         if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
411                 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
412                 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
413         }
414
415         /* HbH is allowed only once */
416         if (np->rxopt.bits.hopopts && opt->hop) {
417                 u8 *ptr = nh + opt->hop;
418                 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
419         }
420
421         if (opt->lastopt &&
422             (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
423                 /*
424                  * Silly enough, but we need to reparse in order to
425                  * report extension headers (except for HbH)
426                  * in order.
427                  *
428                  * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
429                  * (and WILL NOT be) defined because
430                  * IPV6_RECVDSTOPTS is more generic. --yoshfuji
431                  */
432                 unsigned int off = sizeof(struct ipv6hdr);
433                 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
434
435                 while (off <= opt->lastopt) {
436                         unsigned len;
437                         u8 *ptr = nh + off;
438
439                         switch(nexthdr) {
440                         case IPPROTO_DSTOPTS:
441                                 nexthdr = ptr[0];
442                                 len = (ptr[1] + 1) << 3;
443                                 if (np->rxopt.bits.dstopts)
444                                         put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
445                                 break;
446                         case IPPROTO_ROUTING:
447                                 nexthdr = ptr[0];
448                                 len = (ptr[1] + 1) << 3;
449                                 if (np->rxopt.bits.srcrt)
450                                         put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
451                                 break;
452                         case IPPROTO_AH:
453                                 nexthdr = ptr[0];
454                                 len = (ptr[1] + 2) << 2;
455                                 break;
456                         default:
457                                 nexthdr = ptr[0];
458                                 len = (ptr[1] + 1) << 3;
459                                 break;
460                         }
461
462                         off += len;
463                 }
464         }
465
466         /* socket options in old style */
467         if (np->rxopt.bits.rxoinfo) {
468                 struct in6_pktinfo src_info;
469
470                 src_info.ipi6_ifindex = opt->iif;
471                 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
472                 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
473         }
474         if (np->rxopt.bits.rxohlim) {
475                 int hlim = ipv6_hdr(skb)->hop_limit;
476                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
477         }
478         if (np->rxopt.bits.ohopopts && opt->hop) {
479                 u8 *ptr = nh + opt->hop;
480                 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
481         }
482         if (np->rxopt.bits.odstopts && opt->dst0) {
483                 u8 *ptr = nh + opt->dst0;
484                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
485         }
486         if (np->rxopt.bits.osrcrt && opt->srcrt) {
487                 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
488                 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
489         }
490         if (np->rxopt.bits.odstopts && opt->dst1) {
491                 u8 *ptr = nh + opt->dst1;
492                 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
493         }
494         return 0;
495 }
496
497 int datagram_send_ctl(struct net *net,
498                       struct msghdr *msg, struct flowi *fl,
499                       struct ipv6_txoptions *opt,
500                       int *hlimit, int *tclass)
501 {
502         struct in6_pktinfo *src_info;
503         struct cmsghdr *cmsg;
504         struct ipv6_rt_hdr *rthdr;
505         struct ipv6_opt_hdr *hdr;
506         int len;
507         int err = 0;
508
509         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
510                 int addr_type;
511
512                 if (!CMSG_OK(msg, cmsg)) {
513                         err = -EINVAL;
514                         goto exit_f;
515                 }
516
517                 if (cmsg->cmsg_level != SOL_IPV6)
518                         continue;
519
520                 switch (cmsg->cmsg_type) {
521                 case IPV6_PKTINFO:
522                 case IPV6_2292PKTINFO:
523                     {
524                         struct net_device *dev = NULL;
525
526                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
527                                 err = -EINVAL;
528                                 goto exit_f;
529                         }
530
531                         src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
532
533                         if (src_info->ipi6_ifindex) {
534                                 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
535                                         return -EINVAL;
536                                 fl->oif = src_info->ipi6_ifindex;
537                         }
538
539                         addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
540
541                         rcu_read_lock();
542                         if (fl->oif) {
543                                 dev = dev_get_by_index_rcu(net, fl->oif);
544                                 if (!dev) {
545                                         rcu_read_unlock();
546                                         return -ENODEV;
547                                 }
548                         } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
549                                 rcu_read_unlock();
550                                 return -EINVAL;
551                         }
552
553                         if (addr_type != IPV6_ADDR_ANY) {
554                                 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
555                                 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
556                                                    strict ? dev : NULL, 0))
557                                         err = -EINVAL;
558                                 else
559                                         ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
560                         }
561
562                         rcu_read_unlock();
563
564                         if (err)
565                                 goto exit_f;
566
567                         break;
568                     }
569
570                 case IPV6_FLOWINFO:
571                         if (cmsg->cmsg_len < CMSG_LEN(4)) {
572                                 err = -EINVAL;
573                                 goto exit_f;
574                         }
575
576                         if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
577                                 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
578                                         err = -EINVAL;
579                                         goto exit_f;
580                                 }
581                         }
582                         fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
583                         break;
584
585                 case IPV6_2292HOPOPTS:
586                 case IPV6_HOPOPTS:
587                         if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
588                                 err = -EINVAL;
589                                 goto exit_f;
590                         }
591
592                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
593                         len = ((hdr->hdrlen + 1) << 3);
594                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
595                                 err = -EINVAL;
596                                 goto exit_f;
597                         }
598                         if (!capable(CAP_NET_RAW)) {
599                                 err = -EPERM;
600                                 goto exit_f;
601                         }
602                         opt->opt_nflen += len;
603                         opt->hopopt = hdr;
604                         break;
605
606                 case IPV6_2292DSTOPTS:
607                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
608                                 err = -EINVAL;
609                                 goto exit_f;
610                         }
611
612                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
613                         len = ((hdr->hdrlen + 1) << 3);
614                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
615                                 err = -EINVAL;
616                                 goto exit_f;
617                         }
618                         if (!capable(CAP_NET_RAW)) {
619                                 err = -EPERM;
620                                 goto exit_f;
621                         }
622                         if (opt->dst1opt) {
623                                 err = -EINVAL;
624                                 goto exit_f;
625                         }
626                         opt->opt_flen += len;
627                         opt->dst1opt = hdr;
628                         break;
629
630                 case IPV6_DSTOPTS:
631                 case IPV6_RTHDRDSTOPTS:
632                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
633                                 err = -EINVAL;
634                                 goto exit_f;
635                         }
636
637                         hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
638                         len = ((hdr->hdrlen + 1) << 3);
639                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
640                                 err = -EINVAL;
641                                 goto exit_f;
642                         }
643                         if (!capable(CAP_NET_RAW)) {
644                                 err = -EPERM;
645                                 goto exit_f;
646                         }
647                         if (cmsg->cmsg_type == IPV6_DSTOPTS) {
648                                 opt->opt_flen += len;
649                                 opt->dst1opt = hdr;
650                         } else {
651                                 opt->opt_nflen += len;
652                                 opt->dst0opt = hdr;
653                         }
654                         break;
655
656                 case IPV6_2292RTHDR:
657                 case IPV6_RTHDR:
658                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
659                                 err = -EINVAL;
660                                 goto exit_f;
661                         }
662
663                         rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
664
665                         switch (rthdr->type) {
666 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
667                         case IPV6_SRCRT_TYPE_2:
668                                 if (rthdr->hdrlen != 2 ||
669                                     rthdr->segments_left != 1) {
670                                         err = -EINVAL;
671                                         goto exit_f;
672                                 }
673                                 break;
674 #endif
675                         default:
676                                 err = -EINVAL;
677                                 goto exit_f;
678                         }
679
680                         len = ((rthdr->hdrlen + 1) << 3);
681
682                         if (cmsg->cmsg_len < CMSG_LEN(len)) {
683                                 err = -EINVAL;
684                                 goto exit_f;
685                         }
686
687                         /* segments left must also match */
688                         if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
689                                 err = -EINVAL;
690                                 goto exit_f;
691                         }
692
693                         opt->opt_nflen += len;
694                         opt->srcrt = rthdr;
695
696                         if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
697                                 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
698
699                                 opt->opt_nflen += dsthdrlen;
700                                 opt->dst0opt = opt->dst1opt;
701                                 opt->dst1opt = NULL;
702                                 opt->opt_flen -= dsthdrlen;
703                         }
704
705                         break;
706
707                 case IPV6_2292HOPLIMIT:
708                 case IPV6_HOPLIMIT:
709                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
710                                 err = -EINVAL;
711                                 goto exit_f;
712                         }
713
714                         *hlimit = *(int *)CMSG_DATA(cmsg);
715                         if (*hlimit < -1 || *hlimit > 0xff) {
716                                 err = -EINVAL;
717                                 goto exit_f;
718                         }
719
720                         break;
721
722                 case IPV6_TCLASS:
723                     {
724                         int tc;
725
726                         err = -EINVAL;
727                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
728                                 goto exit_f;
729                         }
730
731                         tc = *(int *)CMSG_DATA(cmsg);
732                         if (tc < -1 || tc > 0xff)
733                                 goto exit_f;
734
735                         err = 0;
736                         *tclass = tc;
737
738                         break;
739                     }
740                 default:
741                         LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
742                                        cmsg->cmsg_type);
743                         err = -EINVAL;
744                         goto exit_f;
745                 }
746         }
747
748 exit_f:
749         return err;
750 }