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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 <asm/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 == NULL)
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 != NULL) {
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 kiocb *iocb, struct sock *sk,
460                   struct msghdr *msg, size_t len,
461                   int noblock, int flags, int *addr_len)
462 {
463         struct ipv6_pinfo *np = inet6_sk(sk);
464         DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
465         struct sk_buff *skb;
466         size_t copied;
467         int err;
468 
469         if (flags & MSG_OOB)
470                 return -EOPNOTSUPP;
471 
472         if (flags & MSG_ERRQUEUE)
473                 return ipv6_recv_error(sk, msg, len, addr_len);
474 
475         if (np->rxpmtu && np->rxopt.bits.rxpmtu)
476                 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
477 
478         skb = skb_recv_datagram(sk, flags, noblock, &err);
479         if (!skb)
480                 goto out;
481         if (ccs_socket_post_recvmsg_permission(sk, skb, flags)) {
482                 err = -EAGAIN; /* Hope less harmful than -EPERM. */
483                 goto out;
484         }
485 
486         copied = skb->len;
487         if (copied > len) {
488                 copied = len;
489                 msg->msg_flags |= MSG_TRUNC;
490         }
491 
492         if (skb_csum_unnecessary(skb)) {
493                 err = skb_copy_datagram_msg(skb, 0, msg, copied);
494         } else if (msg->msg_flags&MSG_TRUNC) {
495                 if (__skb_checksum_complete(skb))
496                         goto csum_copy_err;
497                 err = skb_copy_datagram_msg(skb, 0, msg, copied);
498         } else {
499                 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
500                 if (err == -EINVAL)
501                         goto csum_copy_err;
502         }
503         if (err)
504                 goto out_free;
505 
506         /* Copy the address. */
507         if (sin6) {
508                 sin6->sin6_family = AF_INET6;
509                 sin6->sin6_port = 0;
510                 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
511                 sin6->sin6_flowinfo = 0;
512                 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
513                                                           inet6_iif(skb));
514                 *addr_len = sizeof(*sin6);
515         }
516 
517         sock_recv_ts_and_drops(msg, sk, skb);
518 
519         if (np->rxopt.all)
520                 ip6_datagram_recv_ctl(sk, msg, skb);
521 
522         err = copied;
523         if (flags & MSG_TRUNC)
524                 err = skb->len;
525 
526 out_free:
527         skb_free_datagram(sk, skb);
528 out:
529         return err;
530 
531 csum_copy_err:
532         skb_kill_datagram(sk, skb, flags);
533 
534         /* Error for blocking case is chosen to masquerade
535            as some normal condition.
536          */
537         err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
538         goto out;
539 }
540 
541 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
542                                      struct raw6_sock *rp)
543 {
544         struct sk_buff *skb;
545         int err = 0;
546         int offset;
547         int len;
548         int total_len;
549         __wsum tmp_csum;
550         __sum16 csum;
551 
552         if (!rp->checksum)
553                 goto send;
554 
555         skb = skb_peek(&sk->sk_write_queue);
556         if (!skb)
557                 goto out;
558 
559         offset = rp->offset;
560         total_len = inet_sk(sk)->cork.base.length;
561         if (offset >= total_len - 1) {
562                 err = -EINVAL;
563                 ip6_flush_pending_frames(sk);
564                 goto out;
565         }
566 
567         /* should be check HW csum miyazawa */
568         if (skb_queue_len(&sk->sk_write_queue) == 1) {
569                 /*
570                  * Only one fragment on the socket.
571                  */
572                 tmp_csum = skb->csum;
573         } else {
574                 struct sk_buff *csum_skb = NULL;
575                 tmp_csum = 0;
576 
577                 skb_queue_walk(&sk->sk_write_queue, skb) {
578                         tmp_csum = csum_add(tmp_csum, skb->csum);
579 
580                         if (csum_skb)
581                                 continue;
582 
583                         len = skb->len - skb_transport_offset(skb);
584                         if (offset >= len) {
585                                 offset -= len;
586                                 continue;
587                         }
588 
589                         csum_skb = skb;
590                 }
591 
592                 skb = csum_skb;
593         }
594 
595         offset += skb_transport_offset(skb);
596         BUG_ON(skb_copy_bits(skb, offset, &csum, 2));
597 
598         /* in case cksum was not initialized */
599         if (unlikely(csum))
600                 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
601 
602         csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
603                                total_len, fl6->flowi6_proto, tmp_csum);
604 
605         if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
606                 csum = CSUM_MANGLED_0;
607 
608         BUG_ON(skb_store_bits(skb, offset, &csum, 2));
609 
610 send:
611         err = ip6_push_pending_frames(sk);
612 out:
613         return err;
614 }
615 
616 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
617                         struct flowi6 *fl6, struct dst_entry **dstp,
618                         unsigned int flags)
619 {
620         struct ipv6_pinfo *np = inet6_sk(sk);
621         struct ipv6hdr *iph;
622         struct sk_buff *skb;
623         int err;
624         struct rt6_info *rt = (struct rt6_info *)*dstp;
625         int hlen = LL_RESERVED_SPACE(rt->dst.dev);
626         int tlen = rt->dst.dev->needed_tailroom;
627 
628         if (length > rt->dst.dev->mtu) {
629                 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
630                 return -EMSGSIZE;
631         }
632         if (flags&MSG_PROBE)
633                 goto out;
634 
635         skb = sock_alloc_send_skb(sk,
636                                   length + hlen + tlen + 15,
637                                   flags & MSG_DONTWAIT, &err);
638         if (skb == NULL)
639                 goto error;
640         skb_reserve(skb, hlen);
641 
642         skb->protocol = htons(ETH_P_IPV6);
643         skb->priority = sk->sk_priority;
644         skb->mark = sk->sk_mark;
645         skb_dst_set(skb, &rt->dst);
646         *dstp = NULL;
647 
648         skb_put(skb, length);
649         skb_reset_network_header(skb);
650         iph = ipv6_hdr(skb);
651 
652         skb->ip_summed = CHECKSUM_NONE;
653 
654         skb->transport_header = skb->network_header;
655         err = memcpy_from_msg(iph, msg, length);
656         if (err)
657                 goto error_fault;
658 
659         IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
660         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
661                       rt->dst.dev, dst_output);
662         if (err > 0)
663                 err = net_xmit_errno(err);
664         if (err)
665                 goto error;
666 out:
667         return 0;
668 
669 error_fault:
670         err = -EFAULT;
671         kfree_skb(skb);
672 error:
673         IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
674         if (err == -ENOBUFS && !np->recverr)
675                 err = 0;
676         return err;
677 }
678 
679 struct raw6_frag_vec {
680         struct msghdr *msg;
681         int hlen;
682         char c[4];
683 };
684 
685 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
686 {
687         int err = 0;
688         switch (fl6->flowi6_proto) {
689         case IPPROTO_ICMPV6:
690                 rfv->hlen = 2;
691                 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
692                 if (!err) {
693                         fl6->fl6_icmp_type = rfv->c[0];
694                         fl6->fl6_icmp_code = rfv->c[1];
695                 }
696                 break;
697         case IPPROTO_MH:
698                 rfv->hlen = 4;
699                 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
700                 if (!err)
701                         fl6->fl6_mh_type = rfv->c[2];
702         }
703         return err;
704 }
705 
706 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
707                        struct sk_buff *skb)
708 {
709         struct raw6_frag_vec *rfv = from;
710 
711         if (offset < rfv->hlen) {
712                 int copy = min(rfv->hlen - offset, len);
713 
714                 if (skb->ip_summed == CHECKSUM_PARTIAL)
715                         memcpy(to, rfv->c + offset, copy);
716                 else
717                         skb->csum = csum_block_add(
718                                 skb->csum,
719                                 csum_partial_copy_nocheck(rfv->c + offset,
720                                                           to, copy, 0),
721                                 odd);
722 
723                 odd = 0;
724                 offset += copy;
725                 to += copy;
726                 len -= copy;
727 
728                 if (!len)
729                         return 0;
730         }
731 
732         offset -= rfv->hlen;
733 
734         return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
735 }
736 
737 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
738                    struct msghdr *msg, size_t len)
739 {
740         struct ipv6_txoptions opt_space;
741         DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
742         struct in6_addr *daddr, *final_p, final;
743         struct inet_sock *inet = inet_sk(sk);
744         struct ipv6_pinfo *np = inet6_sk(sk);
745         struct raw6_sock *rp = raw6_sk(sk);
746         struct ipv6_txoptions *opt = NULL;
747         struct ip6_flowlabel *flowlabel = NULL;
748         struct dst_entry *dst = NULL;
749         struct raw6_frag_vec rfv;
750         struct flowi6 fl6;
751         int addr_len = msg->msg_namelen;
752         int hlimit = -1;
753         int tclass = -1;
754         int dontfrag = -1;
755         u16 proto;
756         int err;
757 
758         /* Rough check on arithmetic overflow,
759            better check is made in ip6_append_data().
760          */
761         if (len > INT_MAX)
762                 return -EMSGSIZE;
763 
764         /* Mirror BSD error message compatibility */
765         if (msg->msg_flags & MSG_OOB)
766                 return -EOPNOTSUPP;
767 
768         /*
769          *      Get and verify the address.
770          */
771         memset(&fl6, 0, sizeof(fl6));
772 
773         fl6.flowi6_mark = sk->sk_mark;
774 
775         if (sin6) {
776                 if (addr_len < SIN6_LEN_RFC2133)
777                         return -EINVAL;
778 
779                 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
780                         return -EAFNOSUPPORT;
781 
782                 /* port is the proto value [0..255] carried in nexthdr */
783                 proto = ntohs(sin6->sin6_port);
784 
785                 if (!proto)
786                         proto = inet->inet_num;
787                 else if (proto != inet->inet_num)
788                         return -EINVAL;
789 
790                 if (proto > 255)
791                         return -EINVAL;
792 
793                 daddr = &sin6->sin6_addr;
794                 if (np->sndflow) {
795                         fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
796                         if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
797                                 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
798                                 if (flowlabel == NULL)
799                                         return -EINVAL;
800                         }
801                 }
802 
803                 /*
804                  * Otherwise it will be difficult to maintain
805                  * sk->sk_dst_cache.
806                  */
807                 if (sk->sk_state == TCP_ESTABLISHED &&
808                     ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
809                         daddr = &sk->sk_v6_daddr;
810 
811                 if (addr_len >= sizeof(struct sockaddr_in6) &&
812                     sin6->sin6_scope_id &&
813                     __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
814                         fl6.flowi6_oif = sin6->sin6_scope_id;
815         } else {
816                 if (sk->sk_state != TCP_ESTABLISHED)
817                         return -EDESTADDRREQ;
818 
819                 proto = inet->inet_num;
820                 daddr = &sk->sk_v6_daddr;
821                 fl6.flowlabel = np->flow_label;
822         }
823 
824         if (fl6.flowi6_oif == 0)
825                 fl6.flowi6_oif = sk->sk_bound_dev_if;
826 
827         if (msg->msg_controllen) {
828                 opt = &opt_space;
829                 memset(opt, 0, sizeof(struct ipv6_txoptions));
830                 opt->tot_len = sizeof(struct ipv6_txoptions);
831 
832                 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
833                                             &hlimit, &tclass, &dontfrag);
834                 if (err < 0) {
835                         fl6_sock_release(flowlabel);
836                         return err;
837                 }
838                 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
839                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
840                         if (flowlabel == NULL)
841                                 return -EINVAL;
842                 }
843                 if (!(opt->opt_nflen|opt->opt_flen))
844                         opt = NULL;
845         }
846         if (opt == NULL)
847                 opt = np->opt;
848         if (flowlabel)
849                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
850         opt = ipv6_fixup_options(&opt_space, opt);
851 
852         fl6.flowi6_proto = proto;
853         rfv.msg = msg;
854         rfv.hlen = 0;
855         err = rawv6_probe_proto_opt(&rfv, &fl6);
856         if (err)
857                 goto out;
858 
859         if (!ipv6_addr_any(daddr))
860                 fl6.daddr = *daddr;
861         else
862                 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
863         if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
864                 fl6.saddr = np->saddr;
865 
866         final_p = fl6_update_dst(&fl6, opt, &final);
867 
868         if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
869                 fl6.flowi6_oif = np->mcast_oif;
870         else if (!fl6.flowi6_oif)
871                 fl6.flowi6_oif = np->ucast_oif;
872         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
873 
874         dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
875         if (IS_ERR(dst)) {
876                 err = PTR_ERR(dst);
877                 goto out;
878         }
879         if (hlimit < 0)
880                 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
881 
882         if (tclass < 0)
883                 tclass = np->tclass;
884 
885         if (dontfrag < 0)
886                 dontfrag = np->dontfrag;
887 
888         if (msg->msg_flags&MSG_CONFIRM)
889                 goto do_confirm;
890 
891 back_from_confirm:
892         if (inet->hdrincl)
893                 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, msg->msg_flags);
894         else {
895                 lock_sock(sk);
896                 err = ip6_append_data(sk, raw6_getfrag, &rfv,
897                         len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info *)dst,
898                         msg->msg_flags, dontfrag);
899 
900                 if (err)
901                         ip6_flush_pending_frames(sk);
902                 else if (!(msg->msg_flags & MSG_MORE))
903                         err = rawv6_push_pending_frames(sk, &fl6, rp);
904                 release_sock(sk);
905         }
906 done:
907         dst_release(dst);
908 out:
909         fl6_sock_release(flowlabel);
910         return err < 0 ? err : len;
911 do_confirm:
912         dst_confirm(dst);
913         if (!(msg->msg_flags & MSG_PROBE) || len)
914                 goto back_from_confirm;
915         err = 0;
916         goto done;
917 }
918 
919 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
920                                char __user *optval, int optlen)
921 {
922         switch (optname) {
923         case ICMPV6_FILTER:
924                 if (optlen > sizeof(struct icmp6_filter))
925                         optlen = sizeof(struct icmp6_filter);
926                 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
927                         return -EFAULT;
928                 return 0;
929         default:
930                 return -ENOPROTOOPT;
931         }
932 
933         return 0;
934 }
935 
936 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
937                                char __user *optval, int __user *optlen)
938 {
939         int len;
940 
941         switch (optname) {
942         case ICMPV6_FILTER:
943                 if (get_user(len, optlen))
944                         return -EFAULT;
945                 if (len < 0)
946                         return -EINVAL;
947                 if (len > sizeof(struct icmp6_filter))
948                         len = sizeof(struct icmp6_filter);
949                 if (put_user(len, optlen))
950                         return -EFAULT;
951                 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
952                         return -EFAULT;
953                 return 0;
954         default:
955                 return -ENOPROTOOPT;
956         }
957 
958         return 0;
959 }
960 
961 
962 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
963                             char __user *optval, unsigned int optlen)
964 {
965         struct raw6_sock *rp = raw6_sk(sk);
966         int val;
967 
968         if (get_user(val, (int __user *)optval))
969                 return -EFAULT;
970 
971         switch (optname) {
972         case IPV6_CHECKSUM:
973                 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
974                     level == IPPROTO_IPV6) {
975                         /*
976                          * RFC3542 tells that IPV6_CHECKSUM socket
977                          * option in the IPPROTO_IPV6 level is not
978                          * allowed on ICMPv6 sockets.
979                          * If you want to set it, use IPPROTO_RAW
980                          * level IPV6_CHECKSUM socket option
981                          * (Linux extension).
982                          */
983                         return -EINVAL;
984                 }
985 
986                 /* You may get strange result with a positive odd offset;
987                    RFC2292bis agrees with me. */
988                 if (val > 0 && (val&1))
989                         return -EINVAL;
990                 if (val < 0) {
991                         rp->checksum = 0;
992                 } else {
993                         rp->checksum = 1;
994                         rp->offset = val;
995                 }
996 
997                 return 0;
998 
999         default:
1000                 return -ENOPROTOOPT;
1001         }
1002 }
1003 
1004 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1005                           char __user *optval, unsigned int optlen)
1006 {
1007         switch (level) {
1008         case SOL_RAW:
1009                 break;
1010 
1011         case SOL_ICMPV6:
1012                 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1013                         return -EOPNOTSUPP;
1014                 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1015         case SOL_IPV6:
1016                 if (optname == IPV6_CHECKSUM)
1017                         break;
1018         default:
1019                 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1020         }
1021 
1022         return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1023 }
1024 
1025 #ifdef CONFIG_COMPAT
1026 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1027                                    char __user *optval, unsigned int optlen)
1028 {
1029         switch (level) {
1030         case SOL_RAW:
1031                 break;
1032         case SOL_ICMPV6:
1033                 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1034                         return -EOPNOTSUPP;
1035                 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1036         case SOL_IPV6:
1037                 if (optname == IPV6_CHECKSUM)
1038                         break;
1039         default:
1040                 return compat_ipv6_setsockopt(sk, level, optname,
1041                                               optval, optlen);
1042         }
1043         return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1044 }
1045 #endif
1046 
1047 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1048                             char __user *optval, int __user *optlen)
1049 {
1050         struct raw6_sock *rp = raw6_sk(sk);
1051         int val, len;
1052 
1053         if (get_user(len, optlen))
1054                 return -EFAULT;
1055 
1056         switch (optname) {
1057         case IPV6_CHECKSUM:
1058                 /*
1059                  * We allow getsockopt() for IPPROTO_IPV6-level
1060                  * IPV6_CHECKSUM socket option on ICMPv6 sockets
1061                  * since RFC3542 is silent about it.
1062                  */
1063                 if (rp->checksum == 0)
1064                         val = -1;
1065                 else
1066                         val = rp->offset;
1067                 break;
1068 
1069         default:
1070                 return -ENOPROTOOPT;
1071         }
1072 
1073         len = min_t(unsigned int, sizeof(int), len);
1074 
1075         if (put_user(len, optlen))
1076                 return -EFAULT;
1077         if (copy_to_user(optval, &val, len))
1078                 return -EFAULT;
1079         return 0;
1080 }
1081 
1082 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1083                           char __user *optval, int __user *optlen)
1084 {
1085         switch (level) {
1086         case SOL_RAW:
1087                 break;
1088 
1089         case SOL_ICMPV6:
1090                 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1091                         return -EOPNOTSUPP;
1092                 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1093         case SOL_IPV6:
1094                 if (optname == IPV6_CHECKSUM)
1095                         break;
1096         default:
1097                 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1098         }
1099 
1100         return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1101 }
1102 
1103 #ifdef CONFIG_COMPAT
1104 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1105                                    char __user *optval, int __user *optlen)
1106 {
1107         switch (level) {
1108         case SOL_RAW:
1109                 break;
1110         case SOL_ICMPV6:
1111                 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1112                         return -EOPNOTSUPP;
1113                 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1114         case SOL_IPV6:
1115                 if (optname == IPV6_CHECKSUM)
1116                         break;
1117         default:
1118                 return compat_ipv6_getsockopt(sk, level, optname,
1119                                               optval, optlen);
1120         }
1121         return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1122 }
1123 #endif
1124 
1125 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1126 {
1127         switch (cmd) {
1128         case SIOCOUTQ: {
1129                 int amount = sk_wmem_alloc_get(sk);
1130 
1131                 return put_user(amount, (int __user *)arg);
1132         }
1133         case SIOCINQ: {
1134                 struct sk_buff *skb;
1135                 int amount = 0;
1136 
1137                 spin_lock_bh(&sk->sk_receive_queue.lock);
1138                 skb = skb_peek(&sk->sk_receive_queue);
1139                 if (skb != NULL)
1140                         amount = skb_tail_pointer(skb) -
1141                                 skb_transport_header(skb);
1142                 spin_unlock_bh(&sk->sk_receive_queue.lock);
1143                 return put_user(amount, (int __user *)arg);
1144         }
1145 
1146         default:
1147 #ifdef CONFIG_IPV6_MROUTE
1148                 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1149 #else
1150                 return -ENOIOCTLCMD;
1151 #endif
1152         }
1153 }
1154 
1155 #ifdef CONFIG_COMPAT
1156 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1157 {
1158         switch (cmd) {
1159         case SIOCOUTQ:
1160         case SIOCINQ:
1161                 return -ENOIOCTLCMD;
1162         default:
1163 #ifdef CONFIG_IPV6_MROUTE
1164                 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1165 #else
1166                 return -ENOIOCTLCMD;
1167 #endif
1168         }
1169 }
1170 #endif
1171 
1172 static void rawv6_close(struct sock *sk, long timeout)
1173 {
1174         if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1175                 ip6_ra_control(sk, -1);
1176         ip6mr_sk_done(sk);
1177         sk_common_release(sk);
1178 }
1179 
1180 static void raw6_destroy(struct sock *sk)
1181 {
1182         lock_sock(sk);
1183         ip6_flush_pending_frames(sk);
1184         release_sock(sk);
1185 
1186         inet6_destroy_sock(sk);
1187 }
1188 
1189 static int rawv6_init_sk(struct sock *sk)
1190 {
1191         struct raw6_sock *rp = raw6_sk(sk);
1192 
1193         switch (inet_sk(sk)->inet_num) {
1194         case IPPROTO_ICMPV6:
1195                 rp->checksum = 1;
1196                 rp->offset   = 2;
1197                 break;
1198         case IPPROTO_MH:
1199                 rp->checksum = 1;
1200                 rp->offset   = 4;
1201                 break;
1202         default:
1203                 break;
1204         }
1205         return 0;
1206 }
1207 
1208 struct proto rawv6_prot = {
1209         .name              = "RAWv6",
1210         .owner             = THIS_MODULE,
1211         .close             = rawv6_close,
1212         .destroy           = raw6_destroy,
1213         .connect           = ip6_datagram_connect_v6_only,
1214         .disconnect        = udp_disconnect,
1215         .ioctl             = rawv6_ioctl,
1216         .init              = rawv6_init_sk,
1217         .setsockopt        = rawv6_setsockopt,
1218         .getsockopt        = rawv6_getsockopt,
1219         .sendmsg           = rawv6_sendmsg,
1220         .recvmsg           = rawv6_recvmsg,
1221         .bind              = rawv6_bind,
1222         .backlog_rcv       = rawv6_rcv_skb,
1223         .hash              = raw_hash_sk,
1224         .unhash            = raw_unhash_sk,
1225         .obj_size          = sizeof(struct raw6_sock),
1226         .h.raw_hash        = &raw_v6_hashinfo,
1227 #ifdef CONFIG_COMPAT
1228         .compat_setsockopt = compat_rawv6_setsockopt,
1229         .compat_getsockopt = compat_rawv6_getsockopt,
1230         .compat_ioctl      = compat_rawv6_ioctl,
1231 #endif
1232 };
1233 
1234 #ifdef CONFIG_PROC_FS
1235 static int raw6_seq_show(struct seq_file *seq, void *v)
1236 {
1237         if (v == SEQ_START_TOKEN) {
1238                 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1239         } else {
1240                 struct sock *sp = v;
1241                 __u16 srcp  = inet_sk(sp)->inet_num;
1242                 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1243                                         raw_seq_private(seq)->bucket);
1244         }
1245         return 0;
1246 }
1247 
1248 static const struct seq_operations raw6_seq_ops = {
1249         .start =        raw_seq_start,
1250         .next =         raw_seq_next,
1251         .stop =         raw_seq_stop,
1252         .show =         raw6_seq_show,
1253 };
1254 
1255 static int raw6_seq_open(struct inode *inode, struct file *file)
1256 {
1257         return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1258 }
1259 
1260 static const struct file_operations raw6_seq_fops = {
1261         .owner =        THIS_MODULE,
1262         .open =         raw6_seq_open,
1263         .read =         seq_read,
1264         .llseek =       seq_lseek,
1265         .release =      seq_release_net,
1266 };
1267 
1268 static int __net_init raw6_init_net(struct net *net)
1269 {
1270         if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
1271                 return -ENOMEM;
1272 
1273         return 0;
1274 }
1275 
1276 static void __net_exit raw6_exit_net(struct net *net)
1277 {
1278         remove_proc_entry("raw6", net->proc_net);
1279 }
1280 
1281 static struct pernet_operations raw6_net_ops = {
1282         .init = raw6_init_net,
1283         .exit = raw6_exit_net,
1284 };
1285 
1286 int __init raw6_proc_init(void)
1287 {
1288         return register_pernet_subsys(&raw6_net_ops);
1289 }
1290 
1291 void raw6_proc_exit(void)
1292 {
1293         unregister_pernet_subsys(&raw6_net_ops);
1294 }
1295 #endif  /* CONFIG_PROC_FS */
1296 
1297 /* Same as inet6_dgram_ops, sans udp_poll.  */
1298 static const struct proto_ops inet6_sockraw_ops = {
1299         .family            = PF_INET6,
1300         .owner             = THIS_MODULE,
1301         .release           = inet6_release,
1302         .bind              = inet6_bind,
1303         .connect           = inet_dgram_connect,        /* ok           */
1304         .socketpair        = sock_no_socketpair,        /* a do nothing */
1305         .accept            = sock_no_accept,            /* a do nothing */
1306         .getname           = inet6_getname,
1307         .poll              = datagram_poll,             /* ok           */
1308         .ioctl             = inet6_ioctl,               /* must change  */
1309         .listen            = sock_no_listen,            /* ok           */
1310         .shutdown          = inet_shutdown,             /* ok           */
1311         .setsockopt        = sock_common_setsockopt,    /* ok           */
1312         .getsockopt        = sock_common_getsockopt,    /* ok           */
1313         .sendmsg           = inet_sendmsg,              /* ok           */
1314         .recvmsg           = sock_common_recvmsg,       /* ok           */
1315         .mmap              = sock_no_mmap,
1316         .sendpage          = sock_no_sendpage,
1317 #ifdef CONFIG_COMPAT
1318         .compat_setsockopt = compat_sock_common_setsockopt,
1319         .compat_getsockopt = compat_sock_common_getsockopt,
1320 #endif
1321 };
1322 
1323 static struct inet_protosw rawv6_protosw = {
1324         .type           = SOCK_RAW,
1325         .protocol       = IPPROTO_IP,   /* wild card */
1326         .prot           = &rawv6_prot,
1327         .ops            = &inet6_sockraw_ops,
1328         .flags          = INET_PROTOSW_REUSE,
1329 };
1330 
1331 int __init rawv6_init(void)
1332 {
1333         int ret;
1334 
1335         ret = inet6_register_protosw(&rawv6_protosw);
1336         if (ret)
1337                 goto out;
1338 out:
1339         return ret;
1340 }
1341 
1342 void rawv6_exit(void)
1343 {
1344         inet6_unregister_protosw(&rawv6_protosw);
1345 }
1346 

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