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Linux/net/ipv6/raw.c

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  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/slab.h>
 25 #include <linux/sockios.h>
 26 #include <linux/net.h>
 27 #include <linux/in6.h>
 28 #include <linux/netdevice.h>
 29 #include <linux/if_arp.h>
 30 #include <linux/icmpv6.h>
 31 #include <linux/netfilter.h>
 32 #include <linux/netfilter_ipv6.h>
 33 #include <linux/skbuff.h>
 34 #include <linux/compat.h>
 35 #include <linux/uaccess.h>
 36 #include <asm/ioctls.h>
 37 
 38 #include <net/net_namespace.h>
 39 #include <net/ip.h>
 40 #include <net/sock.h>
 41 #include <net/snmp.h>
 42 
 43 #include <net/ipv6.h>
 44 #include <net/ndisc.h>
 45 #include <net/protocol.h>
 46 #include <net/ip6_route.h>
 47 #include <net/ip6_checksum.h>
 48 #include <net/addrconf.h>
 49 #include <net/transp_v6.h>
 50 #include <net/udp.h>
 51 #include <net/inet_common.h>
 52 #include <net/tcp_states.h>
 53 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 54 #include <net/mip6.h>
 55 #endif
 56 #include <linux/mroute6.h>
 57 
 58 #include <net/raw.h>
 59 #include <net/rawv6.h>
 60 #include <net/xfrm.h>
 61 
 62 #include <linux/proc_fs.h>
 63 #include <linux/seq_file.h>
 64 #include <linux/export.h>
 65 
 66 #define ICMPV6_HDRLEN   4       /* ICMPv6 header, RFC 4443 Section 2.1 */
 67 
 68 static struct raw_hashinfo raw_v6_hashinfo = {
 69         .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
 70 };
 71 
 72 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
 73                 unsigned short num, const struct in6_addr *loc_addr,
 74                 const struct in6_addr *rmt_addr, int dif)
 75 {
 76         bool is_multicast = ipv6_addr_is_multicast(loc_addr);
 77 
 78         sk_for_each_from(sk)
 79                 if (inet_sk(sk)->inet_num == num) {
 80 
 81                         if (!net_eq(sock_net(sk), net))
 82                                 continue;
 83 
 84                         if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
 85                             !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
 86                                 continue;
 87 
 88                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
 89                                 continue;
 90 
 91                         if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
 92                                 if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
 93                                         goto found;
 94                                 if (is_multicast &&
 95                                     inet6_mc_check(sk, loc_addr, rmt_addr))
 96                                         goto found;
 97                                 continue;
 98                         }
 99                         goto found;
100                 }
101         sk = NULL;
102 found:
103         return sk;
104 }
105 
106 /*
107  *      0 - deliver
108  *      1 - block
109  */
110 static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
111 {
112         struct icmp6hdr _hdr;
113         const struct icmp6hdr *hdr;
114 
115         /* We require only the four bytes of the ICMPv6 header, not any
116          * additional bytes of message body in "struct icmp6hdr".
117          */
118         hdr = skb_header_pointer(skb, skb_transport_offset(skb),
119                                  ICMPV6_HDRLEN, &_hdr);
120         if (hdr) {
121                 const __u32 *data = &raw6_sk(sk)->filter.data[0];
122                 unsigned int type = hdr->icmp6_type;
123 
124                 return (data[type >> 5] & (1U << (type & 31))) != 0;
125         }
126         return 1;
127 }
128 
129 #if IS_ENABLED(CONFIG_IPV6_MIP6)
130 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
131 
132 static mh_filter_t __rcu *mh_filter __read_mostly;
133 
134 int rawv6_mh_filter_register(mh_filter_t filter)
135 {
136         rcu_assign_pointer(mh_filter, filter);
137         return 0;
138 }
139 EXPORT_SYMBOL(rawv6_mh_filter_register);
140 
141 int rawv6_mh_filter_unregister(mh_filter_t filter)
142 {
143         RCU_INIT_POINTER(mh_filter, NULL);
144         synchronize_rcu();
145         return 0;
146 }
147 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
148 
149 #endif
150 
151 /*
152  *      demultiplex raw sockets.
153  *      (should consider queueing the skb in the sock receive_queue
154  *      without calling rawv6.c)
155  *
156  *      Caller owns SKB so we must make clones.
157  */
158 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
159 {
160         const struct in6_addr *saddr;
161         const struct in6_addr *daddr;
162         struct sock *sk;
163         bool delivered = false;
164         __u8 hash;
165         struct net *net;
166 
167         saddr = &ipv6_hdr(skb)->saddr;
168         daddr = saddr + 1;
169 
170         hash = nexthdr & (RAW_HTABLE_SIZE - 1);
171 
172         read_lock(&raw_v6_hashinfo.lock);
173         sk = sk_head(&raw_v6_hashinfo.ht[hash]);
174 
175         if (!sk)
176                 goto out;
177 
178         net = dev_net(skb->dev);
179         sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, inet6_iif(skb));
180 
181         while (sk) {
182                 int filtered;
183 
184                 delivered = true;
185                 switch (nexthdr) {
186                 case IPPROTO_ICMPV6:
187                         filtered = icmpv6_filter(sk, skb);
188                         break;
189 
190 #if IS_ENABLED(CONFIG_IPV6_MIP6)
191                 case IPPROTO_MH:
192                 {
193                         /* XXX: To validate MH only once for each packet,
194                          * this is placed here. It should be after checking
195                          * xfrm policy, however it doesn't. The checking xfrm
196                          * policy is placed in rawv6_rcv() because it is
197                          * required for each socket.
198                          */
199                         mh_filter_t *filter;
200 
201                         filter = rcu_dereference(mh_filter);
202                         filtered = filter ? (*filter)(sk, skb) : 0;
203                         break;
204                 }
205 #endif
206                 default:
207                         filtered = 0;
208                         break;
209                 }
210 
211                 if (filtered < 0)
212                         break;
213                 if (filtered == 0) {
214                         struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
215 
216                         /* Not releasing hash table! */
217                         if (clone) {
218                                 nf_reset(clone);
219                                 rawv6_rcv(sk, clone);
220                         }
221                 }
222                 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
223                                      inet6_iif(skb));
224         }
225 out:
226         read_unlock(&raw_v6_hashinfo.lock);
227         return delivered;
228 }
229 
230 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
231 {
232         struct sock *raw_sk;
233 
234         raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
235         if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
236                 raw_sk = NULL;
237 
238         return raw_sk != NULL;
239 }
240 
241 /* This cleans up af_inet6 a bit. -DaveM */
242 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
243 {
244         struct inet_sock *inet = inet_sk(sk);
245         struct ipv6_pinfo *np = inet6_sk(sk);
246         struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
247         __be32 v4addr = 0;
248         int addr_type;
249         int err;
250 
251         if (addr_len < SIN6_LEN_RFC2133)
252                 return -EINVAL;
253 
254         if (addr->sin6_family != AF_INET6)
255                 return -EINVAL;
256 
257         addr_type = ipv6_addr_type(&addr->sin6_addr);
258 
259         /* Raw sockets are IPv6 only */
260         if (addr_type == IPV6_ADDR_MAPPED)
261                 return -EADDRNOTAVAIL;
262 
263         lock_sock(sk);
264 
265         err = -EINVAL;
266         if (sk->sk_state != TCP_CLOSE)
267                 goto out;
268 
269         rcu_read_lock();
270         /* Check if the address belongs to the host. */
271         if (addr_type != IPV6_ADDR_ANY) {
272                 struct net_device *dev = NULL;
273 
274                 if (__ipv6_addr_needs_scope_id(addr_type)) {
275                         if (addr_len >= sizeof(struct sockaddr_in6) &&
276                             addr->sin6_scope_id) {
277                                 /* Override any existing binding, if another
278                                  * one is supplied by user.
279                                  */
280                                 sk->sk_bound_dev_if = addr->sin6_scope_id;
281                         }
282 
283                         /* Binding to link-local address requires an interface */
284                         if (!sk->sk_bound_dev_if)
285                                 goto out_unlock;
286 
287                         err = -ENODEV;
288                         dev = dev_get_by_index_rcu(sock_net(sk),
289                                                    sk->sk_bound_dev_if);
290                         if (!dev)
291                                 goto out_unlock;
292                 }
293 
294                 /* ipv4 addr of the socket is invalid.  Only the
295                  * unspecified and mapped address have a v4 equivalent.
296                  */
297                 v4addr = LOOPBACK4_IPV6;
298                 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
299                         err = -EADDRNOTAVAIL;
300                         if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
301                                            dev, 0)) {
302                                 goto out_unlock;
303                         }
304                 }
305         }
306 
307         inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
308         sk->sk_v6_rcv_saddr = addr->sin6_addr;
309         if (!(addr_type & IPV6_ADDR_MULTICAST))
310                 np->saddr = addr->sin6_addr;
311         err = 0;
312 out_unlock:
313         rcu_read_unlock();
314 out:
315         release_sock(sk);
316         return err;
317 }
318 
319 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
320                struct inet6_skb_parm *opt,
321                u8 type, u8 code, int offset, __be32 info)
322 {
323         struct inet_sock *inet = inet_sk(sk);
324         struct ipv6_pinfo *np = inet6_sk(sk);
325         int err;
326         int harderr;
327 
328         /* Report error on raw socket, if:
329            1. User requested recverr.
330            2. Socket is connected (otherwise the error indication
331               is useless without recverr and error is hard.
332          */
333         if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
334                 return;
335 
336         harderr = icmpv6_err_convert(type, code, &err);
337         if (type == ICMPV6_PKT_TOOBIG) {
338                 ip6_sk_update_pmtu(skb, sk, info);
339                 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
340         }
341         if (type == NDISC_REDIRECT) {
342                 ip6_sk_redirect(skb, sk);
343                 return;
344         }
345         if (np->recverr) {
346                 u8 *payload = skb->data;
347                 if (!inet->hdrincl)
348                         payload += offset;
349                 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
350         }
351 
352         if (np->recverr || harderr) {
353                 sk->sk_err = err;
354                 sk->sk_error_report(sk);
355         }
356 }
357 
358 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
359                 u8 type, u8 code, int inner_offset, __be32 info)
360 {
361         struct sock *sk;
362         int hash;
363         const struct in6_addr *saddr, *daddr;
364         struct net *net;
365 
366         hash = nexthdr & (RAW_HTABLE_SIZE - 1);
367 
368         read_lock(&raw_v6_hashinfo.lock);
369         sk = sk_head(&raw_v6_hashinfo.ht[hash]);
370         if (sk) {
371                 /* Note: ipv6_hdr(skb) != skb->data */
372                 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
373                 saddr = &ip6h->saddr;
374                 daddr = &ip6h->daddr;
375                 net = dev_net(skb->dev);
376 
377                 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
378                                                 inet6_iif(skb)))) {
379                         rawv6_err(sk, skb, NULL, type, code,
380                                         inner_offset, info);
381                         sk = sk_next(sk);
382                 }
383         }
384         read_unlock(&raw_v6_hashinfo.lock);
385 }
386 
387 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
388 {
389         if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
390             skb_checksum_complete(skb)) {
391                 atomic_inc(&sk->sk_drops);
392                 kfree_skb(skb);
393                 return NET_RX_DROP;
394         }
395 
396         /* Charge it to the socket. */
397         skb_dst_drop(skb);
398         if (sock_queue_rcv_skb(sk, skb) < 0) {
399                 kfree_skb(skb);
400                 return NET_RX_DROP;
401         }
402 
403         return 0;
404 }
405 
406 /*
407  *      This is next to useless...
408  *      if we demultiplex in network layer we don't need the extra call
409  *      just to queue the skb...
410  *      maybe we could have the network decide upon a hint if it
411  *      should call raw_rcv for demultiplexing
412  */
413 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
414 {
415         struct inet_sock *inet = inet_sk(sk);
416         struct raw6_sock *rp = raw6_sk(sk);
417 
418         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
419                 atomic_inc(&sk->sk_drops);
420                 kfree_skb(skb);
421                 return NET_RX_DROP;
422         }
423 
424         if (!rp->checksum)
425                 skb->ip_summed = CHECKSUM_UNNECESSARY;
426 
427         if (skb->ip_summed == CHECKSUM_COMPLETE) {
428                 skb_postpull_rcsum(skb, skb_network_header(skb),
429                                    skb_network_header_len(skb));
430                 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
431                                      &ipv6_hdr(skb)->daddr,
432                                      skb->len, inet->inet_num, skb->csum))
433                         skb->ip_summed = CHECKSUM_UNNECESSARY;
434         }
435         if (!skb_csum_unnecessary(skb))
436                 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
437                                                          &ipv6_hdr(skb)->daddr,
438                                                          skb->len,
439                                                          inet->inet_num, 0));
440 
441         if (inet->hdrincl) {
442                 if (skb_checksum_complete(skb)) {
443                         atomic_inc(&sk->sk_drops);
444                         kfree_skb(skb);
445                         return NET_RX_DROP;
446                 }
447         }
448 
449         rawv6_rcv_skb(sk, skb);
450         return 0;
451 }
452 
453 
454 /*
455  *      This should be easy, if there is something there
456  *      we return it, otherwise we block.
457  */
458 
459 static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
460                          int noblock, int flags, int *addr_len)
461 {
462         struct ipv6_pinfo *np = inet6_sk(sk);
463         DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
464         struct sk_buff *skb;
465         size_t copied;
466         int err;
467 
468         if (flags & MSG_OOB)
469                 return -EOPNOTSUPP;
470 
471         if (flags & MSG_ERRQUEUE)
472                 return ipv6_recv_error(sk, msg, len, addr_len);
473 
474         if (np->rxpmtu && np->rxopt.bits.rxpmtu)
475                 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
476 
477         skb = skb_recv_datagram(sk, flags, noblock, &err);
478         if (!skb)
479                 goto out;
480         if (ccs_socket_post_recvmsg_permission(sk, skb, flags)) {
481                 err = -EAGAIN; /* Hope less harmful than -EPERM. */
482                 goto out;
483         }
484 
485         copied = skb->len;
486         if (copied > len) {
487                 copied = len;
488                 msg->msg_flags |= MSG_TRUNC;
489         }
490 
491         if (skb_csum_unnecessary(skb)) {
492                 err = skb_copy_datagram_msg(skb, 0, msg, copied);
493         } else if (msg->msg_flags&MSG_TRUNC) {
494                 if (__skb_checksum_complete(skb))
495                         goto csum_copy_err;
496                 err = skb_copy_datagram_msg(skb, 0, msg, copied);
497         } else {
498                 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
499                 if (err == -EINVAL)
500                         goto csum_copy_err;
501         }
502         if (err)
503                 goto out_free;
504 
505         /* Copy the address. */
506         if (sin6) {
507                 sin6->sin6_family = AF_INET6;
508                 sin6->sin6_port = 0;
509                 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
510                 sin6->sin6_flowinfo = 0;
511                 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
512                                                           inet6_iif(skb));
513                 *addr_len = sizeof(*sin6);
514         }
515 
516         sock_recv_ts_and_drops(msg, sk, skb);
517 
518         if (np->rxopt.all)
519                 ip6_datagram_recv_ctl(sk, msg, skb);
520 
521         err = copied;
522         if (flags & MSG_TRUNC)
523                 err = skb->len;
524 
525 out_free:
526         skb_free_datagram(sk, skb);
527 out:
528         return err;
529 
530 csum_copy_err:
531         skb_kill_datagram(sk, skb, flags);
532 
533         /* Error for blocking case is chosen to masquerade
534            as some normal condition.
535          */
536         err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
537         goto out;
538 }
539 
540 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
541                                      struct raw6_sock *rp)
542 {
543         struct sk_buff *skb;
544         int err = 0;
545         int offset;
546         int len;
547         int total_len;
548         __wsum tmp_csum;
549         __sum16 csum;
550 
551         if (!rp->checksum)
552                 goto send;
553 
554         skb = skb_peek(&sk->sk_write_queue);
555         if (!skb)
556                 goto out;
557 
558         offset = rp->offset;
559         total_len = inet_sk(sk)->cork.base.length;
560         if (offset >= total_len - 1) {
561                 err = -EINVAL;
562                 ip6_flush_pending_frames(sk);
563                 goto out;
564         }
565 
566         /* should be check HW csum miyazawa */
567         if (skb_queue_len(&sk->sk_write_queue) == 1) {
568                 /*
569                  * Only one fragment on the socket.
570                  */
571                 tmp_csum = skb->csum;
572         } else {
573                 struct sk_buff *csum_skb = NULL;
574                 tmp_csum = 0;
575 
576                 skb_queue_walk(&sk->sk_write_queue, skb) {
577                         tmp_csum = csum_add(tmp_csum, skb->csum);
578 
579                         if (csum_skb)
580                                 continue;
581 
582                         len = skb->len - skb_transport_offset(skb);
583                         if (offset >= len) {
584                                 offset -= len;
585                                 continue;
586                         }
587 
588                         csum_skb = skb;
589                 }
590 
591                 skb = csum_skb;
592         }
593 
594         offset += skb_transport_offset(skb);
595         BUG_ON(skb_copy_bits(skb, offset, &csum, 2));
596 
597         /* in case cksum was not initialized */
598         if (unlikely(csum))
599                 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
600 
601         csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
602                                total_len, fl6->flowi6_proto, tmp_csum);
603 
604         if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
605                 csum = CSUM_MANGLED_0;
606 
607         BUG_ON(skb_store_bits(skb, offset, &csum, 2));
608 
609 send:
610         err = ip6_push_pending_frames(sk);
611 out:
612         return err;
613 }
614 
615 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
616                         struct flowi6 *fl6, struct dst_entry **dstp,
617                         unsigned int flags)
618 {
619         struct ipv6_pinfo *np = inet6_sk(sk);
620         struct ipv6hdr *iph;
621         struct sk_buff *skb;
622         int err;
623         struct rt6_info *rt = (struct rt6_info *)*dstp;
624         int hlen = LL_RESERVED_SPACE(rt->dst.dev);
625         int tlen = rt->dst.dev->needed_tailroom;
626 
627         if (length > rt->dst.dev->mtu) {
628                 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
629                 return -EMSGSIZE;
630         }
631         if (flags&MSG_PROBE)
632                 goto out;
633 
634         skb = sock_alloc_send_skb(sk,
635                                   length + hlen + tlen + 15,
636                                   flags & MSG_DONTWAIT, &err);
637         if (!skb)
638                 goto error;
639         skb_reserve(skb, hlen);
640 
641         skb->protocol = htons(ETH_P_IPV6);
642         skb->priority = sk->sk_priority;
643         skb->mark = sk->sk_mark;
644         skb_dst_set(skb, &rt->dst);
645         *dstp = NULL;
646 
647         skb_put(skb, length);
648         skb_reset_network_header(skb);
649         iph = ipv6_hdr(skb);
650 
651         skb->ip_summed = CHECKSUM_NONE;
652 
653         skb->transport_header = skb->network_header;
654         err = memcpy_from_msg(iph, msg, length);
655         if (err)
656                 goto error_fault;
657 
658         IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
659         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, sk, skb,
660                       NULL, rt->dst.dev, dst_output_sk);
661         if (err > 0)
662                 err = net_xmit_errno(err);
663         if (err)
664                 goto error;
665 out:
666         return 0;
667 
668 error_fault:
669         err = -EFAULT;
670         kfree_skb(skb);
671 error:
672         IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
673         if (err == -ENOBUFS && !np->recverr)
674                 err = 0;
675         return err;
676 }
677 
678 struct raw6_frag_vec {
679         struct msghdr *msg;
680         int hlen;
681         char c[4];
682 };
683 
684 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
685 {
686         int err = 0;
687         switch (fl6->flowi6_proto) {
688         case IPPROTO_ICMPV6:
689                 rfv->hlen = 2;
690                 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
691                 if (!err) {
692                         fl6->fl6_icmp_type = rfv->c[0];
693                         fl6->fl6_icmp_code = rfv->c[1];
694                 }
695                 break;
696         case IPPROTO_MH:
697                 rfv->hlen = 4;
698                 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
699                 if (!err)
700                         fl6->fl6_mh_type = rfv->c[2];
701         }
702         return err;
703 }
704 
705 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
706                        struct sk_buff *skb)
707 {
708         struct raw6_frag_vec *rfv = from;
709 
710         if (offset < rfv->hlen) {
711                 int copy = min(rfv->hlen - offset, len);
712 
713                 if (skb->ip_summed == CHECKSUM_PARTIAL)
714                         memcpy(to, rfv->c + offset, copy);
715                 else
716                         skb->csum = csum_block_add(
717                                 skb->csum,
718                                 csum_partial_copy_nocheck(rfv->c + offset,
719                                                           to, copy, 0),
720                                 odd);
721 
722                 odd = 0;
723                 offset += copy;
724                 to += copy;
725                 len -= copy;
726 
727                 if (!len)
728                         return 0;
729         }
730 
731         offset -= rfv->hlen;
732 
733         return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
734 }
735 
736 static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
737 {
738         struct ipv6_txoptions *opt_to_free = NULL;
739         struct ipv6_txoptions opt_space;
740         DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
741         struct in6_addr *daddr, *final_p, final;
742         struct inet_sock *inet = inet_sk(sk);
743         struct ipv6_pinfo *np = inet6_sk(sk);
744         struct raw6_sock *rp = raw6_sk(sk);
745         struct ipv6_txoptions *opt = NULL;
746         struct ip6_flowlabel *flowlabel = NULL;
747         struct dst_entry *dst = NULL;
748         struct raw6_frag_vec rfv;
749         struct flowi6 fl6;
750         int addr_len = msg->msg_namelen;
751         int hlimit = -1;
752         int tclass = -1;
753         int dontfrag = -1;
754         u16 proto;
755         int err;
756 
757         /* Rough check on arithmetic overflow,
758            better check is made in ip6_append_data().
759          */
760         if (len > INT_MAX)
761                 return -EMSGSIZE;
762 
763         /* Mirror BSD error message compatibility */
764         if (msg->msg_flags & MSG_OOB)
765                 return -EOPNOTSUPP;
766 
767         /*
768          *      Get and verify the address.
769          */
770         memset(&fl6, 0, sizeof(fl6));
771 
772         fl6.flowi6_mark = sk->sk_mark;
773 
774         if (sin6) {
775                 if (addr_len < SIN6_LEN_RFC2133)
776                         return -EINVAL;
777 
778                 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
779                         return -EAFNOSUPPORT;
780 
781                 /* port is the proto value [0..255] carried in nexthdr */
782                 proto = ntohs(sin6->sin6_port);
783 
784                 if (!proto)
785                         proto = inet->inet_num;
786                 else if (proto != inet->inet_num)
787                         return -EINVAL;
788 
789                 if (proto > 255)
790                         return -EINVAL;
791 
792                 daddr = &sin6->sin6_addr;
793                 if (np->sndflow) {
794                         fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
795                         if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
796                                 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
797                                 if (!flowlabel)
798                                         return -EINVAL;
799                         }
800                 }
801 
802                 /*
803                  * Otherwise it will be difficult to maintain
804                  * sk->sk_dst_cache.
805                  */
806                 if (sk->sk_state == TCP_ESTABLISHED &&
807                     ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
808                         daddr = &sk->sk_v6_daddr;
809 
810                 if (addr_len >= sizeof(struct sockaddr_in6) &&
811                     sin6->sin6_scope_id &&
812                     __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
813                         fl6.flowi6_oif = sin6->sin6_scope_id;
814         } else {
815                 if (sk->sk_state != TCP_ESTABLISHED)
816                         return -EDESTADDRREQ;
817 
818                 proto = inet->inet_num;
819                 daddr = &sk->sk_v6_daddr;
820                 fl6.flowlabel = np->flow_label;
821         }
822 
823         if (fl6.flowi6_oif == 0)
824                 fl6.flowi6_oif = sk->sk_bound_dev_if;
825 
826         if (msg->msg_controllen) {
827                 opt = &opt_space;
828                 memset(opt, 0, sizeof(struct ipv6_txoptions));
829                 opt->tot_len = sizeof(struct ipv6_txoptions);
830 
831                 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
832                                             &hlimit, &tclass, &dontfrag);
833                 if (err < 0) {
834                         fl6_sock_release(flowlabel);
835                         return err;
836                 }
837                 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
838                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
839                         if (!flowlabel)
840                                 return -EINVAL;
841                 }
842                 if (!(opt->opt_nflen|opt->opt_flen))
843                         opt = NULL;
844         }
845         if (!opt) {
846                 opt = txopt_get(np);
847                 opt_to_free = opt;
848                 }
849         if (flowlabel)
850                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
851         opt = ipv6_fixup_options(&opt_space, opt);
852 
853         fl6.flowi6_proto = proto;
854         rfv.msg = msg;
855         rfv.hlen = 0;
856         err = rawv6_probe_proto_opt(&rfv, &fl6);
857         if (err)
858                 goto out;
859 
860         if (!ipv6_addr_any(daddr))
861                 fl6.daddr = *daddr;
862         else
863                 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
864         if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
865                 fl6.saddr = np->saddr;
866 
867         final_p = fl6_update_dst(&fl6, opt, &final);
868 
869         if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
870                 fl6.flowi6_oif = np->mcast_oif;
871         else if (!fl6.flowi6_oif)
872                 fl6.flowi6_oif = np->ucast_oif;
873         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
874 
875         if (inet->hdrincl)
876                 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
877 
878         dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
879         if (IS_ERR(dst)) {
880                 err = PTR_ERR(dst);
881                 goto out;
882         }
883         if (hlimit < 0)
884                 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
885 
886         if (tclass < 0)
887                 tclass = np->tclass;
888 
889         if (dontfrag < 0)
890                 dontfrag = np->dontfrag;
891 
892         if (msg->msg_flags&MSG_CONFIRM)
893                 goto do_confirm;
894 
895 back_from_confirm:
896         if (inet->hdrincl)
897                 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, msg->msg_flags);
898         else {
899                 lock_sock(sk);
900                 err = ip6_append_data(sk, raw6_getfrag, &rfv,
901                         len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info *)dst,
902                         msg->msg_flags, dontfrag);
903 
904                 if (err)
905                         ip6_flush_pending_frames(sk);
906                 else if (!(msg->msg_flags & MSG_MORE))
907                         err = rawv6_push_pending_frames(sk, &fl6, rp);
908                 release_sock(sk);
909         }
910 done:
911         dst_release(dst);
912 out:
913         fl6_sock_release(flowlabel);
914         txopt_put(opt_to_free);
915         return err < 0 ? err : len;
916 do_confirm:
917         dst_confirm(dst);
918         if (!(msg->msg_flags & MSG_PROBE) || len)
919                 goto back_from_confirm;
920         err = 0;
921         goto done;
922 }
923 
924 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
925                                char __user *optval, int optlen)
926 {
927         switch (optname) {
928         case ICMPV6_FILTER:
929                 if (optlen > sizeof(struct icmp6_filter))
930                         optlen = sizeof(struct icmp6_filter);
931                 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
932                         return -EFAULT;
933                 return 0;
934         default:
935                 return -ENOPROTOOPT;
936         }
937 
938         return 0;
939 }
940 
941 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
942                                char __user *optval, int __user *optlen)
943 {
944         int len;
945 
946         switch (optname) {
947         case ICMPV6_FILTER:
948                 if (get_user(len, optlen))
949                         return -EFAULT;
950                 if (len < 0)
951                         return -EINVAL;
952                 if (len > sizeof(struct icmp6_filter))
953                         len = sizeof(struct icmp6_filter);
954                 if (put_user(len, optlen))
955                         return -EFAULT;
956                 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
957                         return -EFAULT;
958                 return 0;
959         default:
960                 return -ENOPROTOOPT;
961         }
962 
963         return 0;
964 }
965 
966 
967 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
968                             char __user *optval, unsigned int optlen)
969 {
970         struct raw6_sock *rp = raw6_sk(sk);
971         int val;
972 
973         if (get_user(val, (int __user *)optval))
974                 return -EFAULT;
975 
976         switch (optname) {
977         case IPV6_CHECKSUM:
978                 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
979                     level == IPPROTO_IPV6) {
980                         /*
981                          * RFC3542 tells that IPV6_CHECKSUM socket
982                          * option in the IPPROTO_IPV6 level is not
983                          * allowed on ICMPv6 sockets.
984                          * If you want to set it, use IPPROTO_RAW
985                          * level IPV6_CHECKSUM socket option
986                          * (Linux extension).
987                          */
988                         return -EINVAL;
989                 }
990 
991                 /* You may get strange result with a positive odd offset;
992                    RFC2292bis agrees with me. */
993                 if (val > 0 && (val&1))
994                         return -EINVAL;
995                 if (val < 0) {
996                         rp->checksum = 0;
997                 } else {
998                         rp->checksum = 1;
999                         rp->offset = val;
1000                 }
1001 
1002                 return 0;
1003 
1004         default:
1005                 return -ENOPROTOOPT;
1006         }
1007 }
1008 
1009 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1010                           char __user *optval, unsigned int optlen)
1011 {
1012         switch (level) {
1013         case SOL_RAW:
1014                 break;
1015 
1016         case SOL_ICMPV6:
1017                 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1018                         return -EOPNOTSUPP;
1019                 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1020         case SOL_IPV6:
1021                 if (optname == IPV6_CHECKSUM)
1022                         break;
1023         default:
1024                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1025         }
1026 
1027         return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1028 }
1029 
1030 #ifdef CONFIG_COMPAT
1031 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1032                                    char __user *optval, unsigned int optlen)
1033 {
1034         switch (level) {
1035         case SOL_RAW:
1036                 break;
1037         case SOL_ICMPV6:
1038                 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1039                         return -EOPNOTSUPP;
1040                 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1041         case SOL_IPV6:
1042                 if (optname == IPV6_CHECKSUM)
1043                         break;
1044         default:
1045                 return compat_ipv6_setsockopt(sk, level, optname,
1046                                               optval, optlen);
1047         }
1048         return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1049 }
1050 #endif
1051 
1052 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1053                             char __user *optval, int __user *optlen)
1054 {
1055         struct raw6_sock *rp = raw6_sk(sk);
1056         int val, len;
1057 
1058         if (get_user(len, optlen))
1059                 return -EFAULT;
1060 
1061         switch (optname) {
1062         case IPV6_CHECKSUM:
1063                 /*
1064                  * We allow getsockopt() for IPPROTO_IPV6-level
1065                  * IPV6_CHECKSUM socket option on ICMPv6 sockets
1066                  * since RFC3542 is silent about it.
1067                  */
1068                 if (rp->checksum == 0)
1069                         val = -1;
1070                 else
1071                         val = rp->offset;
1072                 break;
1073 
1074         default:
1075                 return -ENOPROTOOPT;
1076         }
1077 
1078         len = min_t(unsigned int, sizeof(int), len);
1079 
1080         if (put_user(len, optlen))
1081                 return -EFAULT;
1082         if (copy_to_user(optval, &val, len))
1083                 return -EFAULT;
1084         return 0;
1085 }
1086 
1087 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1088                           char __user *optval, int __user *optlen)
1089 {
1090         switch (level) {
1091         case SOL_RAW:
1092                 break;
1093 
1094         case SOL_ICMPV6:
1095                 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1096                         return -EOPNOTSUPP;
1097                 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1098         case SOL_IPV6:
1099                 if (optname == IPV6_CHECKSUM)
1100                         break;
1101         default:
1102                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1103         }
1104 
1105         return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1106 }
1107 
1108 #ifdef CONFIG_COMPAT
1109 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1110                                    char __user *optval, int __user *optlen)
1111 {
1112         switch (level) {
1113         case SOL_RAW:
1114                 break;
1115         case SOL_ICMPV6:
1116                 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1117                         return -EOPNOTSUPP;
1118                 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1119         case SOL_IPV6:
1120                 if (optname == IPV6_CHECKSUM)
1121                         break;
1122         default:
1123                 return compat_ipv6_getsockopt(sk, level, optname,
1124                                               optval, optlen);
1125         }
1126         return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1127 }
1128 #endif
1129 
1130 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1131 {
1132         switch (cmd) {
1133         case SIOCOUTQ: {
1134                 int amount = sk_wmem_alloc_get(sk);
1135 
1136                 return put_user(amount, (int __user *)arg);
1137         }
1138         case SIOCINQ: {
1139                 struct sk_buff *skb;
1140                 int amount = 0;
1141 
1142                 spin_lock_bh(&sk->sk_receive_queue.lock);
1143                 skb = skb_peek(&sk->sk_receive_queue);
1144                 if (skb)
1145                         amount = skb_tail_pointer(skb) -
1146                                 skb_transport_header(skb);
1147                 spin_unlock_bh(&sk->sk_receive_queue.lock);
1148                 return put_user(amount, (int __user *)arg);
1149         }
1150 
1151         default:
1152 #ifdef CONFIG_IPV6_MROUTE
1153                 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1154 #else
1155                 return -ENOIOCTLCMD;
1156 #endif
1157         }
1158 }
1159 
1160 #ifdef CONFIG_COMPAT
1161 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1162 {
1163         switch (cmd) {
1164         case SIOCOUTQ:
1165         case SIOCINQ:
1166                 return -ENOIOCTLCMD;
1167         default:
1168 #ifdef CONFIG_IPV6_MROUTE
1169                 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1170 #else
1171                 return -ENOIOCTLCMD;
1172 #endif
1173         }
1174 }
1175 #endif
1176 
1177 static void rawv6_close(struct sock *sk, long timeout)
1178 {
1179         if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1180                 ip6_ra_control(sk, -1);
1181         ip6mr_sk_done(sk);
1182         sk_common_release(sk);
1183 }
1184 
1185 static void raw6_destroy(struct sock *sk)
1186 {
1187         lock_sock(sk);
1188         ip6_flush_pending_frames(sk);
1189         release_sock(sk);
1190 
1191         inet6_destroy_sock(sk);
1192 }
1193 
1194 static int rawv6_init_sk(struct sock *sk)
1195 {
1196         struct raw6_sock *rp = raw6_sk(sk);
1197 
1198         switch (inet_sk(sk)->inet_num) {
1199         case IPPROTO_ICMPV6:
1200                 rp->checksum = 1;
1201                 rp->offset   = 2;
1202                 break;
1203         case IPPROTO_MH:
1204                 rp->checksum = 1;
1205                 rp->offset   = 4;
1206                 break;
1207         default:
1208                 break;
1209         }
1210         return 0;
1211 }
1212 
1213 struct proto rawv6_prot = {
1214         .name              = "RAWv6",
1215         .owner             = THIS_MODULE,
1216         .close             = rawv6_close,
1217         .destroy           = raw6_destroy,
1218         .connect           = ip6_datagram_connect_v6_only,
1219         .disconnect        = udp_disconnect,
1220         .ioctl             = rawv6_ioctl,
1221         .init              = rawv6_init_sk,
1222         .setsockopt        = rawv6_setsockopt,
1223         .getsockopt        = rawv6_getsockopt,
1224         .sendmsg           = rawv6_sendmsg,
1225         .recvmsg           = rawv6_recvmsg,
1226         .bind              = rawv6_bind,
1227         .backlog_rcv       = rawv6_rcv_skb,
1228         .hash              = raw_hash_sk,
1229         .unhash            = raw_unhash_sk,
1230         .obj_size          = sizeof(struct raw6_sock),
1231         .h.raw_hash        = &raw_v6_hashinfo,
1232 #ifdef CONFIG_COMPAT
1233         .compat_setsockopt = compat_rawv6_setsockopt,
1234         .compat_getsockopt = compat_rawv6_getsockopt,
1235         .compat_ioctl      = compat_rawv6_ioctl,
1236 #endif
1237 };
1238 
1239 #ifdef CONFIG_PROC_FS
1240 static int raw6_seq_show(struct seq_file *seq, void *v)
1241 {
1242         if (v == SEQ_START_TOKEN) {
1243                 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1244         } else {
1245                 struct sock *sp = v;
1246                 __u16 srcp  = inet_sk(sp)->inet_num;
1247                 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1248                                         raw_seq_private(seq)->bucket);
1249         }
1250         return 0;
1251 }
1252 
1253 static const struct seq_operations raw6_seq_ops = {
1254         .start =        raw_seq_start,
1255         .next =         raw_seq_next,
1256         .stop =         raw_seq_stop,
1257         .show =         raw6_seq_show,
1258 };
1259 
1260 static int raw6_seq_open(struct inode *inode, struct file *file)
1261 {
1262         return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1263 }
1264 
1265 static const struct file_operations raw6_seq_fops = {
1266         .owner =        THIS_MODULE,
1267         .open =         raw6_seq_open,
1268         .read =         seq_read,
1269         .llseek =       seq_lseek,
1270         .release =      seq_release_net,
1271 };
1272 
1273 static int __net_init raw6_init_net(struct net *net)
1274 {
1275         if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
1276                 return -ENOMEM;
1277 
1278         return 0;
1279 }
1280 
1281 static void __net_exit raw6_exit_net(struct net *net)
1282 {
1283         remove_proc_entry("raw6", net->proc_net);
1284 }
1285 
1286 static struct pernet_operations raw6_net_ops = {
1287         .init = raw6_init_net,
1288         .exit = raw6_exit_net,
1289 };
1290 
1291 int __init raw6_proc_init(void)
1292 {
1293         return register_pernet_subsys(&raw6_net_ops);
1294 }
1295 
1296 void raw6_proc_exit(void)
1297 {
1298         unregister_pernet_subsys(&raw6_net_ops);
1299 }
1300 #endif  /* CONFIG_PROC_FS */
1301 
1302 /* Same as inet6_dgram_ops, sans udp_poll.  */
1303 static const struct proto_ops inet6_sockraw_ops = {
1304         .family            = PF_INET6,
1305         .owner             = THIS_MODULE,
1306         .release           = inet6_release,
1307         .bind              = inet6_bind,
1308         .connect           = inet_dgram_connect,        /* ok           */
1309         .socketpair        = sock_no_socketpair,        /* a do nothing */
1310         .accept            = sock_no_accept,            /* a do nothing */
1311         .getname           = inet6_getname,
1312         .poll              = datagram_poll,             /* ok           */
1313         .ioctl             = inet6_ioctl,               /* must change  */
1314         .listen            = sock_no_listen,            /* ok           */
1315         .shutdown          = inet_shutdown,             /* ok           */
1316         .setsockopt        = sock_common_setsockopt,    /* ok           */
1317         .getsockopt        = sock_common_getsockopt,    /* ok           */
1318         .sendmsg           = inet_sendmsg,              /* ok           */
1319         .recvmsg           = sock_common_recvmsg,       /* ok           */
1320         .mmap              = sock_no_mmap,
1321         .sendpage          = sock_no_sendpage,
1322 #ifdef CONFIG_COMPAT
1323         .compat_setsockopt = compat_sock_common_setsockopt,
1324         .compat_getsockopt = compat_sock_common_getsockopt,
1325 #endif
1326 };
1327 
1328 static struct inet_protosw rawv6_protosw = {
1329         .type           = SOCK_RAW,
1330         .protocol       = IPPROTO_IP,   /* wild card */
1331         .prot           = &rawv6_prot,
1332         .ops            = &inet6_sockraw_ops,
1333         .flags          = INET_PROTOSW_REUSE,
1334 };
1335 
1336 int __init rawv6_init(void)
1337 {
1338         return inet6_register_protosw(&rawv6_protosw);
1339 }
1340 
1341 void rawv6_exit(void)
1342 {
1343         inet6_unregister_protosw(&rawv6_protosw);
1344 }
1345 

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