Merge branch 'fix/asoc' into for-linus
[linux-2.6] / net / ipv6 / raw.c
1 /*
2  *      RAW sockets for IPv6
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>
7  *
8  *      Adapted from linux/net/ipv4/raw.c
9  *
10  *      Fixes:
11  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
12  *      YOSHIFUJI,H.@USAGI      :       raw checksum (RFC2292(bis) compliance)
13  *      Kazunori MIYAZAWA @USAGI:       change process style to use ip6_append_data
14  *
15  *      This program is free software; you can redistribute it and/or
16  *      modify it under the terms of the GNU General Public License
17  *      as published by the Free Software Foundation; either version
18  *      2 of the License, or (at your option) any later version.
19  */
20
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/sockios.h>
25 #include <linux/net.h>
26 #include <linux/in6.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/icmpv6.h>
30 #include <linux/netfilter.h>
31 #include <linux/netfilter_ipv6.h>
32 #include <linux/skbuff.h>
33 #include <asm/uaccess.h>
34 #include <asm/ioctls.h>
35
36 #include <net/net_namespace.h>
37 #include <net/ip.h>
38 #include <net/sock.h>
39 #include <net/snmp.h>
40
41 #include <net/ipv6.h>
42 #include <net/ndisc.h>
43 #include <net/protocol.h>
44 #include <net/ip6_route.h>
45 #include <net/ip6_checksum.h>
46 #include <net/addrconf.h>
47 #include <net/transp_v6.h>
48 #include <net/udp.h>
49 #include <net/inet_common.h>
50 #include <net/tcp_states.h>
51 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
52 #include <net/mip6.h>
53 #endif
54 #include <linux/mroute6.h>
55
56 #include <net/raw.h>
57 #include <net/rawv6.h>
58 #include <net/xfrm.h>
59
60 #include <linux/proc_fs.h>
61 #include <linux/seq_file.h>
62
63 static struct raw_hashinfo raw_v6_hashinfo = {
64         .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
65 };
66
67 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
68                 unsigned short num, struct in6_addr *loc_addr,
69                 struct in6_addr *rmt_addr, int dif)
70 {
71         struct hlist_node *node;
72         int is_multicast = ipv6_addr_is_multicast(loc_addr);
73
74         sk_for_each_from(sk, node)
75                 if (inet_sk(sk)->num == num) {
76                         struct ipv6_pinfo *np = inet6_sk(sk);
77
78                         if (!net_eq(sock_net(sk), net))
79                                 continue;
80
81                         if (!ipv6_addr_any(&np->daddr) &&
82                             !ipv6_addr_equal(&np->daddr, rmt_addr))
83                                 continue;
84
85                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
86                                 continue;
87
88                         if (!ipv6_addr_any(&np->rcv_saddr)) {
89                                 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
90                                         goto found;
91                                 if (is_multicast &&
92                                     inet6_mc_check(sk, loc_addr, rmt_addr))
93                                         goto found;
94                                 continue;
95                         }
96                         goto found;
97                 }
98         sk = NULL;
99 found:
100         return sk;
101 }
102
103 /*
104  *      0 - deliver
105  *      1 - block
106  */
107 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
108 {
109         struct icmp6hdr *icmph;
110         struct raw6_sock *rp = raw6_sk(sk);
111
112         if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
113                 __u32 *data = &rp->filter.data[0];
114                 int bit_nr;
115
116                 icmph = (struct icmp6hdr *) skb->data;
117                 bit_nr = icmph->icmp6_type;
118
119                 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
120         }
121         return 0;
122 }
123
124 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
125 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);
126
127 int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
128                                            struct sk_buff *skb))
129 {
130         rcu_assign_pointer(mh_filter, filter);
131         return 0;
132 }
133 EXPORT_SYMBOL(rawv6_mh_filter_register);
134
135 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
136                                              struct sk_buff *skb))
137 {
138         rcu_assign_pointer(mh_filter, NULL);
139         synchronize_rcu();
140         return 0;
141 }
142 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
143
144 #endif
145
146 /*
147  *      demultiplex raw sockets.
148  *      (should consider queueing the skb in the sock receive_queue
149  *      without calling rawv6.c)
150  *
151  *      Caller owns SKB so we must make clones.
152  */
153 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
154 {
155         struct in6_addr *saddr;
156         struct in6_addr *daddr;
157         struct sock *sk;
158         int delivered = 0;
159         __u8 hash;
160         struct net *net;
161
162         saddr = &ipv6_hdr(skb)->saddr;
163         daddr = saddr + 1;
164
165         hash = nexthdr & (MAX_INET_PROTOS - 1);
166
167         read_lock(&raw_v6_hashinfo.lock);
168         sk = sk_head(&raw_v6_hashinfo.ht[hash]);
169
170         if (sk == NULL)
171                 goto out;
172
173         net = dev_net(skb->dev);
174         sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
175
176         while (sk) {
177                 int filtered;
178
179                 delivered = 1;
180                 switch (nexthdr) {
181                 case IPPROTO_ICMPV6:
182                         filtered = icmpv6_filter(sk, skb);
183                         break;
184
185 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
186                 case IPPROTO_MH:
187                 {
188                         /* XXX: To validate MH only once for each packet,
189                          * this is placed here. It should be after checking
190                          * xfrm policy, however it doesn't. The checking xfrm
191                          * policy is placed in rawv6_rcv() because it is
192                          * required for each socket.
193                          */
194                         int (*filter)(struct sock *sock, struct sk_buff *skb);
195
196                         filter = rcu_dereference(mh_filter);
197                         filtered = filter ? filter(sk, skb) : 0;
198                         break;
199                 }
200 #endif
201                 default:
202                         filtered = 0;
203                         break;
204                 }
205
206                 if (filtered < 0)
207                         break;
208                 if (filtered == 0) {
209                         struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
210
211                         /* Not releasing hash table! */
212                         if (clone) {
213                                 nf_reset(clone);
214                                 rawv6_rcv(sk, clone);
215                         }
216                 }
217                 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
218                                      IP6CB(skb)->iif);
219         }
220 out:
221         read_unlock(&raw_v6_hashinfo.lock);
222         return delivered;
223 }
224
225 int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
226 {
227         struct sock *raw_sk;
228
229         raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
230         if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
231                 raw_sk = NULL;
232
233         return raw_sk != NULL;
234 }
235
236 /* This cleans up af_inet6 a bit. -DaveM */
237 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
238 {
239         struct inet_sock *inet = inet_sk(sk);
240         struct ipv6_pinfo *np = inet6_sk(sk);
241         struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
242         __be32 v4addr = 0;
243         int addr_type;
244         int err;
245
246         if (addr_len < SIN6_LEN_RFC2133)
247                 return -EINVAL;
248         addr_type = ipv6_addr_type(&addr->sin6_addr);
249
250         /* Raw sockets are IPv6 only */
251         if (addr_type == IPV6_ADDR_MAPPED)
252                 return(-EADDRNOTAVAIL);
253
254         lock_sock(sk);
255
256         err = -EINVAL;
257         if (sk->sk_state != TCP_CLOSE)
258                 goto out;
259
260         /* Check if the address belongs to the host. */
261         if (addr_type != IPV6_ADDR_ANY) {
262                 struct net_device *dev = NULL;
263
264                 if (addr_type & IPV6_ADDR_LINKLOCAL) {
265                         if (addr_len >= sizeof(struct sockaddr_in6) &&
266                             addr->sin6_scope_id) {
267                                 /* Override any existing binding, if another
268                                  * one is supplied by user.
269                                  */
270                                 sk->sk_bound_dev_if = addr->sin6_scope_id;
271                         }
272
273                         /* Binding to link-local address requires an interface */
274                         if (!sk->sk_bound_dev_if)
275                                 goto out;
276
277                         dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
278                         if (!dev) {
279                                 err = -ENODEV;
280                                 goto out;
281                         }
282                 }
283
284                 /* ipv4 addr of the socket is invalid.  Only the
285                  * unspecified and mapped address have a v4 equivalent.
286                  */
287                 v4addr = LOOPBACK4_IPV6;
288                 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
289                         err = -EADDRNOTAVAIL;
290                         if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
291                                            dev, 0)) {
292                                 if (dev)
293                                         dev_put(dev);
294                                 goto out;
295                         }
296                 }
297                 if (dev)
298                         dev_put(dev);
299         }
300
301         inet->rcv_saddr = inet->saddr = v4addr;
302         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
303         if (!(addr_type & IPV6_ADDR_MULTICAST))
304                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
305         err = 0;
306 out:
307         release_sock(sk);
308         return err;
309 }
310
311 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
312                struct inet6_skb_parm *opt,
313                int type, int code, int offset, __be32 info)
314 {
315         struct inet_sock *inet = inet_sk(sk);
316         struct ipv6_pinfo *np = inet6_sk(sk);
317         int err;
318         int harderr;
319
320         /* Report error on raw socket, if:
321            1. User requested recverr.
322            2. Socket is connected (otherwise the error indication
323               is useless without recverr and error is hard.
324          */
325         if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
326                 return;
327
328         harderr = icmpv6_err_convert(type, code, &err);
329         if (type == ICMPV6_PKT_TOOBIG)
330                 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
331
332         if (np->recverr) {
333                 u8 *payload = skb->data;
334                 if (!inet->hdrincl)
335                         payload += offset;
336                 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
337         }
338
339         if (np->recverr || harderr) {
340                 sk->sk_err = err;
341                 sk->sk_error_report(sk);
342         }
343 }
344
345 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
346                 int type, int code, int inner_offset, __be32 info)
347 {
348         struct sock *sk;
349         int hash;
350         struct in6_addr *saddr, *daddr;
351         struct net *net;
352
353         hash = nexthdr & (RAW_HTABLE_SIZE - 1);
354
355         read_lock(&raw_v6_hashinfo.lock);
356         sk = sk_head(&raw_v6_hashinfo.ht[hash]);
357         if (sk != NULL) {
358                 /* Note: ipv6_hdr(skb) != skb->data */
359                 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data;
360                 saddr = &ip6h->saddr;
361                 daddr = &ip6h->daddr;
362                 net = dev_net(skb->dev);
363
364                 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
365                                                 IP6CB(skb)->iif))) {
366                         rawv6_err(sk, skb, NULL, type, code,
367                                         inner_offset, info);
368                         sk = sk_next(sk);
369                 }
370         }
371         read_unlock(&raw_v6_hashinfo.lock);
372 }
373
374 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
375 {
376         if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
377             skb_checksum_complete(skb)) {
378                 atomic_inc(&sk->sk_drops);
379                 kfree_skb(skb);
380                 return NET_RX_DROP;
381         }
382
383         /* Charge it to the socket. */
384         if (sock_queue_rcv_skb(sk,skb)<0) {
385                 atomic_inc(&sk->sk_drops);
386                 kfree_skb(skb);
387                 return NET_RX_DROP;
388         }
389
390         return 0;
391 }
392
393 /*
394  *      This is next to useless...
395  *      if we demultiplex in network layer we don't need the extra call
396  *      just to queue the skb...
397  *      maybe we could have the network decide upon a hint if it
398  *      should call raw_rcv for demultiplexing
399  */
400 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
401 {
402         struct inet_sock *inet = inet_sk(sk);
403         struct raw6_sock *rp = raw6_sk(sk);
404
405         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
406                 atomic_inc(&sk->sk_drops);
407                 kfree_skb(skb);
408                 return NET_RX_DROP;
409         }
410
411         if (!rp->checksum)
412                 skb->ip_summed = CHECKSUM_UNNECESSARY;
413
414         if (skb->ip_summed == CHECKSUM_COMPLETE) {
415                 skb_postpull_rcsum(skb, skb_network_header(skb),
416                                    skb_network_header_len(skb));
417                 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
418                                      &ipv6_hdr(skb)->daddr,
419                                      skb->len, inet->num, skb->csum))
420                         skb->ip_summed = CHECKSUM_UNNECESSARY;
421         }
422         if (!skb_csum_unnecessary(skb))
423                 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
424                                                          &ipv6_hdr(skb)->daddr,
425                                                          skb->len,
426                                                          inet->num, 0));
427
428         if (inet->hdrincl) {
429                 if (skb_checksum_complete(skb)) {
430                         atomic_inc(&sk->sk_drops);
431                         kfree_skb(skb);
432                         return NET_RX_DROP;
433                 }
434         }
435
436         rawv6_rcv_skb(sk, skb);
437         return 0;
438 }
439
440
441 /*
442  *      This should be easy, if there is something there
443  *      we return it, otherwise we block.
444  */
445
446 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
447                   struct msghdr *msg, size_t len,
448                   int noblock, int flags, int *addr_len)
449 {
450         struct ipv6_pinfo *np = inet6_sk(sk);
451         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
452         struct sk_buff *skb;
453         size_t copied;
454         int err;
455
456         if (flags & MSG_OOB)
457                 return -EOPNOTSUPP;
458
459         if (addr_len)
460                 *addr_len=sizeof(*sin6);
461
462         if (flags & MSG_ERRQUEUE)
463                 return ipv6_recv_error(sk, msg, len);
464
465         skb = skb_recv_datagram(sk, flags, noblock, &err);
466         if (!skb)
467                 goto out;
468
469         copied = skb->len;
470         if (copied > len) {
471                 copied = len;
472                 msg->msg_flags |= MSG_TRUNC;
473         }
474
475         if (skb_csum_unnecessary(skb)) {
476                 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
477         } else if (msg->msg_flags&MSG_TRUNC) {
478                 if (__skb_checksum_complete(skb))
479                         goto csum_copy_err;
480                 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
481         } else {
482                 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
483                 if (err == -EINVAL)
484                         goto csum_copy_err;
485         }
486         if (err)
487                 goto out_free;
488
489         /* Copy the address. */
490         if (sin6) {
491                 sin6->sin6_family = AF_INET6;
492                 sin6->sin6_port = 0;
493                 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
494                 sin6->sin6_flowinfo = 0;
495                 sin6->sin6_scope_id = 0;
496                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
497                         sin6->sin6_scope_id = IP6CB(skb)->iif;
498         }
499
500         sock_recv_timestamp(msg, sk, skb);
501
502         if (np->rxopt.all)
503                 datagram_recv_ctl(sk, msg, skb);
504
505         err = copied;
506         if (flags & MSG_TRUNC)
507                 err = skb->len;
508
509 out_free:
510         skb_free_datagram(sk, skb);
511 out:
512         return err;
513
514 csum_copy_err:
515         skb_kill_datagram(sk, skb, flags);
516
517         /* Error for blocking case is chosen to masquerade
518            as some normal condition.
519          */
520         err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
521         atomic_inc(&sk->sk_drops);
522         goto out;
523 }
524
525 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
526                                      struct raw6_sock *rp)
527 {
528         struct sk_buff *skb;
529         int err = 0;
530         int offset;
531         int len;
532         int total_len;
533         __wsum tmp_csum;
534         __sum16 csum;
535
536         if (!rp->checksum)
537                 goto send;
538
539         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
540                 goto out;
541
542         offset = rp->offset;
543         total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
544                                                 skb->data);
545         if (offset >= total_len - 1) {
546                 err = -EINVAL;
547                 ip6_flush_pending_frames(sk);
548                 goto out;
549         }
550
551         /* should be check HW csum miyazawa */
552         if (skb_queue_len(&sk->sk_write_queue) == 1) {
553                 /*
554                  * Only one fragment on the socket.
555                  */
556                 tmp_csum = skb->csum;
557         } else {
558                 struct sk_buff *csum_skb = NULL;
559                 tmp_csum = 0;
560
561                 skb_queue_walk(&sk->sk_write_queue, skb) {
562                         tmp_csum = csum_add(tmp_csum, skb->csum);
563
564                         if (csum_skb)
565                                 continue;
566
567                         len = skb->len - skb_transport_offset(skb);
568                         if (offset >= len) {
569                                 offset -= len;
570                                 continue;
571                         }
572
573                         csum_skb = skb;
574                 }
575
576                 skb = csum_skb;
577         }
578
579         offset += skb_transport_offset(skb);
580         if (skb_copy_bits(skb, offset, &csum, 2))
581                 BUG();
582
583         /* in case cksum was not initialized */
584         if (unlikely(csum))
585                 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
586
587         csum = csum_ipv6_magic(&fl->fl6_src,
588                                    &fl->fl6_dst,
589                                    total_len, fl->proto, tmp_csum);
590
591         if (csum == 0 && fl->proto == IPPROTO_UDP)
592                 csum = CSUM_MANGLED_0;
593
594         if (skb_store_bits(skb, offset, &csum, 2))
595                 BUG();
596
597 send:
598         err = ip6_push_pending_frames(sk);
599 out:
600         return err;
601 }
602
603 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
604                         struct flowi *fl, struct rt6_info *rt,
605                         unsigned int flags)
606 {
607         struct ipv6_pinfo *np = inet6_sk(sk);
608         struct ipv6hdr *iph;
609         struct sk_buff *skb;
610         int err;
611
612         if (length > rt->u.dst.dev->mtu) {
613                 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
614                 return -EMSGSIZE;
615         }
616         if (flags&MSG_PROBE)
617                 goto out;
618
619         skb = sock_alloc_send_skb(sk,
620                                   length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15,
621                                   flags & MSG_DONTWAIT, &err);
622         if (skb == NULL)
623                 goto error;
624         skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev));
625
626         skb->priority = sk->sk_priority;
627         skb->mark = sk->sk_mark;
628         skb->dst = dst_clone(&rt->u.dst);
629
630         skb_put(skb, length);
631         skb_reset_network_header(skb);
632         iph = ipv6_hdr(skb);
633
634         skb->ip_summed = CHECKSUM_NONE;
635
636         skb->transport_header = skb->network_header;
637         err = memcpy_fromiovecend((void *)iph, from, 0, length);
638         if (err)
639                 goto error_fault;
640
641         IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
642         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
643                       dst_output);
644         if (err > 0)
645                 err = np->recverr ? net_xmit_errno(err) : 0;
646         if (err)
647                 goto error;
648 out:
649         return 0;
650
651 error_fault:
652         err = -EFAULT;
653         kfree_skb(skb);
654 error:
655         IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
656         return err;
657 }
658
659 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
660 {
661         struct iovec *iov;
662         u8 __user *type = NULL;
663         u8 __user *code = NULL;
664         u8 len = 0;
665         int probed = 0;
666         int i;
667
668         if (!msg->msg_iov)
669                 return 0;
670
671         for (i = 0; i < msg->msg_iovlen; i++) {
672                 iov = &msg->msg_iov[i];
673                 if (!iov)
674                         continue;
675
676                 switch (fl->proto) {
677                 case IPPROTO_ICMPV6:
678                         /* check if one-byte field is readable or not. */
679                         if (iov->iov_base && iov->iov_len < 1)
680                                 break;
681
682                         if (!type) {
683                                 type = iov->iov_base;
684                                 /* check if code field is readable or not. */
685                                 if (iov->iov_len > 1)
686                                         code = type + 1;
687                         } else if (!code)
688                                 code = iov->iov_base;
689
690                         if (type && code) {
691                                 if (get_user(fl->fl_icmp_type, type) ||
692                                     get_user(fl->fl_icmp_code, code))
693                                         return -EFAULT;
694                                 probed = 1;
695                         }
696                         break;
697                 case IPPROTO_MH:
698                         if (iov->iov_base && iov->iov_len < 1)
699                                 break;
700                         /* check if type field is readable or not. */
701                         if (iov->iov_len > 2 - len) {
702                                 u8 __user *p = iov->iov_base;
703                                 if (get_user(fl->fl_mh_type, &p[2 - len]))
704                                         return -EFAULT;
705                                 probed = 1;
706                         } else
707                                 len += iov->iov_len;
708
709                         break;
710                 default:
711                         probed = 1;
712                         break;
713                 }
714                 if (probed)
715                         break;
716         }
717         return 0;
718 }
719
720 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
721                    struct msghdr *msg, size_t len)
722 {
723         struct ipv6_txoptions opt_space;
724         struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
725         struct in6_addr *daddr, *final_p = NULL, final;
726         struct inet_sock *inet = inet_sk(sk);
727         struct ipv6_pinfo *np = inet6_sk(sk);
728         struct raw6_sock *rp = raw6_sk(sk);
729         struct ipv6_txoptions *opt = NULL;
730         struct ip6_flowlabel *flowlabel = NULL;
731         struct dst_entry *dst = NULL;
732         struct flowi fl;
733         int addr_len = msg->msg_namelen;
734         int hlimit = -1;
735         int tclass = -1;
736         u16 proto;
737         int err;
738
739         /* Rough check on arithmetic overflow,
740            better check is made in ip6_append_data().
741          */
742         if (len > INT_MAX)
743                 return -EMSGSIZE;
744
745         /* Mirror BSD error message compatibility */
746         if (msg->msg_flags & MSG_OOB)
747                 return -EOPNOTSUPP;
748
749         /*
750          *      Get and verify the address.
751          */
752         memset(&fl, 0, sizeof(fl));
753
754         fl.mark = sk->sk_mark;
755
756         if (sin6) {
757                 if (addr_len < SIN6_LEN_RFC2133)
758                         return -EINVAL;
759
760                 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
761                         return(-EAFNOSUPPORT);
762
763                 /* port is the proto value [0..255] carried in nexthdr */
764                 proto = ntohs(sin6->sin6_port);
765
766                 if (!proto)
767                         proto = inet->num;
768                 else if (proto != inet->num)
769                         return(-EINVAL);
770
771                 if (proto > 255)
772                         return(-EINVAL);
773
774                 daddr = &sin6->sin6_addr;
775                 if (np->sndflow) {
776                         fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
777                         if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
778                                 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
779                                 if (flowlabel == NULL)
780                                         return -EINVAL;
781                                 daddr = &flowlabel->dst;
782                         }
783                 }
784
785                 /*
786                  * Otherwise it will be difficult to maintain
787                  * sk->sk_dst_cache.
788                  */
789                 if (sk->sk_state == TCP_ESTABLISHED &&
790                     ipv6_addr_equal(daddr, &np->daddr))
791                         daddr = &np->daddr;
792
793                 if (addr_len >= sizeof(struct sockaddr_in6) &&
794                     sin6->sin6_scope_id &&
795                     ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
796                         fl.oif = sin6->sin6_scope_id;
797         } else {
798                 if (sk->sk_state != TCP_ESTABLISHED)
799                         return -EDESTADDRREQ;
800
801                 proto = inet->num;
802                 daddr = &np->daddr;
803                 fl.fl6_flowlabel = np->flow_label;
804         }
805
806         if (fl.oif == 0)
807                 fl.oif = sk->sk_bound_dev_if;
808
809         if (msg->msg_controllen) {
810                 opt = &opt_space;
811                 memset(opt, 0, sizeof(struct ipv6_txoptions));
812                 opt->tot_len = sizeof(struct ipv6_txoptions);
813
814                 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
815                 if (err < 0) {
816                         fl6_sock_release(flowlabel);
817                         return err;
818                 }
819                 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
820                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
821                         if (flowlabel == NULL)
822                                 return -EINVAL;
823                 }
824                 if (!(opt->opt_nflen|opt->opt_flen))
825                         opt = NULL;
826         }
827         if (opt == NULL)
828                 opt = np->opt;
829         if (flowlabel)
830                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
831         opt = ipv6_fixup_options(&opt_space, opt);
832
833         fl.proto = proto;
834         err = rawv6_probe_proto_opt(&fl, msg);
835         if (err)
836                 goto out;
837
838         if (!ipv6_addr_any(daddr))
839                 ipv6_addr_copy(&fl.fl6_dst, daddr);
840         else
841                 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
842         if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
843                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
844
845         /* merge ip6_build_xmit from ip6_output */
846         if (opt && opt->srcrt) {
847                 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
848                 ipv6_addr_copy(&final, &fl.fl6_dst);
849                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
850                 final_p = &final;
851         }
852
853         if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
854                 fl.oif = np->mcast_oif;
855         security_sk_classify_flow(sk, &fl);
856
857         err = ip6_dst_lookup(sk, &dst, &fl);
858         if (err)
859                 goto out;
860         if (final_p)
861                 ipv6_addr_copy(&fl.fl6_dst, final_p);
862
863         err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
864         if (err < 0) {
865                 if (err == -EREMOTE)
866                         err = ip6_dst_blackhole(sk, &dst, &fl);
867                 if (err < 0)
868                         goto out;
869         }
870
871         if (hlimit < 0) {
872                 if (ipv6_addr_is_multicast(&fl.fl6_dst))
873                         hlimit = np->mcast_hops;
874                 else
875                         hlimit = np->hop_limit;
876                 if (hlimit < 0)
877                         hlimit = ip6_dst_hoplimit(dst);
878         }
879
880         if (tclass < 0) {
881                 tclass = np->tclass;
882                 if (tclass < 0)
883                         tclass = 0;
884         }
885
886         if (msg->msg_flags&MSG_CONFIRM)
887                 goto do_confirm;
888
889 back_from_confirm:
890         if (inet->hdrincl) {
891                 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
892         } else {
893                 lock_sock(sk);
894                 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
895                         len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
896                         msg->msg_flags);
897
898                 if (err)
899                         ip6_flush_pending_frames(sk);
900                 else if (!(msg->msg_flags & MSG_MORE))
901                         err = rawv6_push_pending_frames(sk, &fl, rp);
902                 release_sock(sk);
903         }
904 done:
905         dst_release(dst);
906 out:
907         fl6_sock_release(flowlabel);
908         return err<0?err:len;
909 do_confirm:
910         dst_confirm(dst);
911         if (!(msg->msg_flags & MSG_PROBE) || len)
912                 goto back_from_confirm;
913         err = 0;
914         goto done;
915 }
916
917 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
918                                char __user *optval, int optlen)
919 {
920         switch (optname) {
921         case ICMPV6_FILTER:
922                 if (optlen > sizeof(struct icmp6_filter))
923                         optlen = sizeof(struct icmp6_filter);
924                 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
925                         return -EFAULT;
926                 return 0;
927         default:
928                 return -ENOPROTOOPT;
929         }
930
931         return 0;
932 }
933
934 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
935                                char __user *optval, int __user *optlen)
936 {
937         int len;
938
939         switch (optname) {
940         case ICMPV6_FILTER:
941                 if (get_user(len, optlen))
942                         return -EFAULT;
943                 if (len < 0)
944                         return -EINVAL;
945                 if (len > sizeof(struct icmp6_filter))
946                         len = sizeof(struct icmp6_filter);
947                 if (put_user(len, optlen))
948                         return -EFAULT;
949                 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
950                         return -EFAULT;
951                 return 0;
952         default:
953                 return -ENOPROTOOPT;
954         }
955
956         return 0;
957 }
958
959
960 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
961                             char __user *optval, int optlen)
962 {
963         struct raw6_sock *rp = raw6_sk(sk);
964         int val;
965
966         if (get_user(val, (int __user *)optval))
967                 return -EFAULT;
968
969         switch (optname) {
970                 case IPV6_CHECKSUM:
971                         if (inet_sk(sk)->num == IPPROTO_ICMPV6 &&
972                             level == IPPROTO_IPV6) {
973                                 /*
974                                  * RFC3542 tells that IPV6_CHECKSUM socket
975                                  * option in the IPPROTO_IPV6 level is not
976                                  * allowed on ICMPv6 sockets.
977                                  * If you want to set it, use IPPROTO_RAW
978                                  * level IPV6_CHECKSUM socket option
979                                  * (Linux extension).
980                                  */
981                                 return -EINVAL;
982                         }
983
984                         /* You may get strange result with a positive odd offset;
985                            RFC2292bis agrees with me. */
986                         if (val > 0 && (val&1))
987                                 return(-EINVAL);
988                         if (val < 0) {
989                                 rp->checksum = 0;
990                         } else {
991                                 rp->checksum = 1;
992                                 rp->offset = val;
993                         }
994
995                         return 0;
996                         break;
997
998                 default:
999                         return(-ENOPROTOOPT);
1000         }
1001 }
1002
1003 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1004                           char __user *optval, int optlen)
1005 {
1006         switch(level) {
1007                 case SOL_RAW:
1008                         break;
1009
1010                 case SOL_ICMPV6:
1011                         if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1012                                 return -EOPNOTSUPP;
1013                         return rawv6_seticmpfilter(sk, level, optname, optval,
1014                                                    optlen);
1015                 case SOL_IPV6:
1016                         if (optname == IPV6_CHECKSUM)
1017                                 break;
1018                 default:
1019                         return ipv6_setsockopt(sk, level, optname, optval,
1020                                                optlen);
1021         }
1022
1023         return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1024 }
1025
1026 #ifdef CONFIG_COMPAT
1027 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1028                                    char __user *optval, int optlen)
1029 {
1030         switch (level) {
1031         case SOL_RAW:
1032                 break;
1033         case SOL_ICMPV6:
1034                 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1035                         return -EOPNOTSUPP;
1036                 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1037         case SOL_IPV6:
1038                 if (optname == IPV6_CHECKSUM)
1039                         break;
1040         default:
1041                 return compat_ipv6_setsockopt(sk, level, optname,
1042                                               optval, optlen);
1043         }
1044         return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1045 }
1046 #endif
1047
1048 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1049                             char __user *optval, int __user *optlen)
1050 {
1051         struct raw6_sock *rp = raw6_sk(sk);
1052         int val, len;
1053
1054         if (get_user(len,optlen))
1055                 return -EFAULT;
1056
1057         switch (optname) {
1058         case IPV6_CHECKSUM:
1059                 /*
1060                  * We allow getsockopt() for IPPROTO_IPV6-level
1061                  * IPV6_CHECKSUM socket option on ICMPv6 sockets
1062                  * since RFC3542 is silent about it.
1063                  */
1064                 if (rp->checksum == 0)
1065                         val = -1;
1066                 else
1067                         val = rp->offset;
1068                 break;
1069
1070         default:
1071                 return -ENOPROTOOPT;
1072         }
1073
1074         len = min_t(unsigned int, sizeof(int), len);
1075
1076         if (put_user(len, optlen))
1077                 return -EFAULT;
1078         if (copy_to_user(optval,&val,len))
1079                 return -EFAULT;
1080         return 0;
1081 }
1082
1083 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1084                           char __user *optval, int __user *optlen)
1085 {
1086         switch(level) {
1087                 case SOL_RAW:
1088                         break;
1089
1090                 case SOL_ICMPV6:
1091                         if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1092                                 return -EOPNOTSUPP;
1093                         return rawv6_geticmpfilter(sk, level, optname, optval,
1094                                                    optlen);
1095                 case SOL_IPV6:
1096                         if (optname == IPV6_CHECKSUM)
1097                                 break;
1098                 default:
1099                         return ipv6_getsockopt(sk, level, optname, optval,
1100                                                optlen);
1101         }
1102
1103         return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1104 }
1105
1106 #ifdef CONFIG_COMPAT
1107 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1108                                    char __user *optval, int __user *optlen)
1109 {
1110         switch (level) {
1111         case SOL_RAW:
1112                 break;
1113         case SOL_ICMPV6:
1114                 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1115                         return -EOPNOTSUPP;
1116                 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1117         case SOL_IPV6:
1118                 if (optname == IPV6_CHECKSUM)
1119                         break;
1120         default:
1121                 return compat_ipv6_getsockopt(sk, level, optname,
1122                                               optval, optlen);
1123         }
1124         return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1125 }
1126 #endif
1127
1128 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1129 {
1130         switch(cmd) {
1131                 case SIOCOUTQ:
1132                 {
1133                         int amount = atomic_read(&sk->sk_wmem_alloc);
1134                         return put_user(amount, (int __user *)arg);
1135                 }
1136                 case SIOCINQ:
1137                 {
1138                         struct sk_buff *skb;
1139                         int amount = 0;
1140
1141                         spin_lock_bh(&sk->sk_receive_queue.lock);
1142                         skb = skb_peek(&sk->sk_receive_queue);
1143                         if (skb != NULL)
1144                                 amount = skb->tail - skb->transport_header;
1145                         spin_unlock_bh(&sk->sk_receive_queue.lock);
1146                         return put_user(amount, (int __user *)arg);
1147                 }
1148
1149                 default:
1150 #ifdef CONFIG_IPV6_MROUTE
1151                         return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1152 #else
1153                         return -ENOIOCTLCMD;
1154 #endif
1155         }
1156 }
1157
1158 static void rawv6_close(struct sock *sk, long timeout)
1159 {
1160         if (inet_sk(sk)->num == IPPROTO_RAW)
1161                 ip6_ra_control(sk, -1);
1162         ip6mr_sk_done(sk);
1163         sk_common_release(sk);
1164 }
1165
1166 static void raw6_destroy(struct sock *sk)
1167 {
1168         lock_sock(sk);
1169         ip6_flush_pending_frames(sk);
1170         release_sock(sk);
1171
1172         inet6_destroy_sock(sk);
1173 }
1174
1175 static int rawv6_init_sk(struct sock *sk)
1176 {
1177         struct raw6_sock *rp = raw6_sk(sk);
1178
1179         switch (inet_sk(sk)->num) {
1180         case IPPROTO_ICMPV6:
1181                 rp->checksum = 1;
1182                 rp->offset   = 2;
1183                 break;
1184         case IPPROTO_MH:
1185                 rp->checksum = 1;
1186                 rp->offset   = 4;
1187                 break;
1188         default:
1189                 break;
1190         }
1191         return(0);
1192 }
1193
1194 struct proto rawv6_prot = {
1195         .name              = "RAWv6",
1196         .owner             = THIS_MODULE,
1197         .close             = rawv6_close,
1198         .destroy           = raw6_destroy,
1199         .connect           = ip6_datagram_connect,
1200         .disconnect        = udp_disconnect,
1201         .ioctl             = rawv6_ioctl,
1202         .init              = rawv6_init_sk,
1203         .setsockopt        = rawv6_setsockopt,
1204         .getsockopt        = rawv6_getsockopt,
1205         .sendmsg           = rawv6_sendmsg,
1206         .recvmsg           = rawv6_recvmsg,
1207         .bind              = rawv6_bind,
1208         .backlog_rcv       = rawv6_rcv_skb,
1209         .hash              = raw_hash_sk,
1210         .unhash            = raw_unhash_sk,
1211         .obj_size          = sizeof(struct raw6_sock),
1212         .h.raw_hash        = &raw_v6_hashinfo,
1213 #ifdef CONFIG_COMPAT
1214         .compat_setsockopt = compat_rawv6_setsockopt,
1215         .compat_getsockopt = compat_rawv6_getsockopt,
1216 #endif
1217 };
1218
1219 #ifdef CONFIG_PROC_FS
1220 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1221 {
1222         struct ipv6_pinfo *np = inet6_sk(sp);
1223         struct in6_addr *dest, *src;
1224         __u16 destp, srcp;
1225
1226         dest  = &np->daddr;
1227         src   = &np->rcv_saddr;
1228         destp = 0;
1229         srcp  = inet_sk(sp)->num;
1230         seq_printf(seq,
1231                    "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1232                    "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1233                    i,
1234                    src->s6_addr32[0], src->s6_addr32[1],
1235                    src->s6_addr32[2], src->s6_addr32[3], srcp,
1236                    dest->s6_addr32[0], dest->s6_addr32[1],
1237                    dest->s6_addr32[2], dest->s6_addr32[3], destp,
1238                    sp->sk_state,
1239                    atomic_read(&sp->sk_wmem_alloc),
1240                    atomic_read(&sp->sk_rmem_alloc),
1241                    0, 0L, 0,
1242                    sock_i_uid(sp), 0,
1243                    sock_i_ino(sp),
1244                    atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1245 }
1246
1247 static int raw6_seq_show(struct seq_file *seq, void *v)
1248 {
1249         if (v == SEQ_START_TOKEN)
1250                 seq_printf(seq,
1251                            "  sl  "
1252                            "local_address                         "
1253                            "remote_address                        "
1254                            "st tx_queue rx_queue tr tm->when retrnsmt"
1255                            "   uid  timeout inode ref pointer drops\n");
1256         else
1257                 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1258         return 0;
1259 }
1260
1261 static const struct seq_operations raw6_seq_ops = {
1262         .start =        raw_seq_start,
1263         .next =         raw_seq_next,
1264         .stop =         raw_seq_stop,
1265         .show =         raw6_seq_show,
1266 };
1267
1268 static int raw6_seq_open(struct inode *inode, struct file *file)
1269 {
1270         return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1271 }
1272
1273 static const struct file_operations raw6_seq_fops = {
1274         .owner =        THIS_MODULE,
1275         .open =         raw6_seq_open,
1276         .read =         seq_read,
1277         .llseek =       seq_lseek,
1278         .release =      seq_release_net,
1279 };
1280
1281 static int raw6_init_net(struct net *net)
1282 {
1283         if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops))
1284                 return -ENOMEM;
1285
1286         return 0;
1287 }
1288
1289 static void raw6_exit_net(struct net *net)
1290 {
1291         proc_net_remove(net, "raw6");
1292 }
1293
1294 static struct pernet_operations raw6_net_ops = {
1295         .init = raw6_init_net,
1296         .exit = raw6_exit_net,
1297 };
1298
1299 int __init raw6_proc_init(void)
1300 {
1301         return register_pernet_subsys(&raw6_net_ops);
1302 }
1303
1304 void raw6_proc_exit(void)
1305 {
1306         unregister_pernet_subsys(&raw6_net_ops);
1307 }
1308 #endif  /* CONFIG_PROC_FS */
1309
1310 /* Same as inet6_dgram_ops, sans udp_poll.  */
1311 static const struct proto_ops inet6_sockraw_ops = {
1312         .family            = PF_INET6,
1313         .owner             = THIS_MODULE,
1314         .release           = inet6_release,
1315         .bind              = inet6_bind,
1316         .connect           = inet_dgram_connect,        /* ok           */
1317         .socketpair        = sock_no_socketpair,        /* a do nothing */
1318         .accept            = sock_no_accept,            /* a do nothing */
1319         .getname           = inet6_getname,
1320         .poll              = datagram_poll,             /* ok           */
1321         .ioctl             = inet6_ioctl,               /* must change  */
1322         .listen            = sock_no_listen,            /* ok           */
1323         .shutdown          = inet_shutdown,             /* ok           */
1324         .setsockopt        = sock_common_setsockopt,    /* ok           */
1325         .getsockopt        = sock_common_getsockopt,    /* ok           */
1326         .sendmsg           = inet_sendmsg,              /* ok           */
1327         .recvmsg           = sock_common_recvmsg,       /* ok           */
1328         .mmap              = sock_no_mmap,
1329         .sendpage          = sock_no_sendpage,
1330 #ifdef CONFIG_COMPAT
1331         .compat_setsockopt = compat_sock_common_setsockopt,
1332         .compat_getsockopt = compat_sock_common_getsockopt,
1333 #endif
1334 };
1335
1336 static struct inet_protosw rawv6_protosw = {
1337         .type           = SOCK_RAW,
1338         .protocol       = IPPROTO_IP,   /* wild card */
1339         .prot           = &rawv6_prot,
1340         .ops            = &inet6_sockraw_ops,
1341         .capability     = CAP_NET_RAW,
1342         .no_check       = UDP_CSUM_DEFAULT,
1343         .flags          = INET_PROTOSW_REUSE,
1344 };
1345
1346 int __init rawv6_init(void)
1347 {
1348         int ret;
1349
1350         ret = inet6_register_protosw(&rawv6_protosw);
1351         if (ret)
1352                 goto out;
1353 out:
1354         return ret;
1355 }
1356
1357 void rawv6_exit(void)
1358 {
1359         inet6_unregister_protosw(&rawv6_protosw);
1360 }