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