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Linux/net/ipv4/raw.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  4  *              operating system.  INET is implemented using the  BSD Socket
  5  *              interface as the means of communication with the user level.
  6  *
  7  *              RAW - implementation of IP "raw" sockets.
  8  *
  9  * Authors:     Ross Biro
 10  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 11  *
 12  * Fixes:
 13  *              Alan Cox        :       verify_area() fixed up
 14  *              Alan Cox        :       ICMP error handling
 15  *              Alan Cox        :       EMSGSIZE if you send too big a packet
 16  *              Alan Cox        :       Now uses generic datagrams and shared
 17  *                                      skbuff library. No more peek crashes,
 18  *                                      no more backlogs
 19  *              Alan Cox        :       Checks sk->broadcast.
 20  *              Alan Cox        :       Uses skb_free_datagram/skb_copy_datagram
 21  *              Alan Cox        :       Raw passes ip options too
 22  *              Alan Cox        :       Setsocketopt added
 23  *              Alan Cox        :       Fixed error return for broadcasts
 24  *              Alan Cox        :       Removed wake_up calls
 25  *              Alan Cox        :       Use ttl/tos
 26  *              Alan Cox        :       Cleaned up old debugging
 27  *              Alan Cox        :       Use new kernel side addresses
 28  *      Arnt Gulbrandsen        :       Fixed MSG_DONTROUTE in raw sockets.
 29  *              Alan Cox        :       BSD style RAW socket demultiplexing.
 30  *              Alan Cox        :       Beginnings of mrouted support.
 31  *              Alan Cox        :       Added IP_HDRINCL option.
 32  *              Alan Cox        :       Skip broadcast check if BSDism set.
 33  *              David S. Miller :       New socket lookup architecture.
 34  */
 35 
 36 #include <linux/types.h>
 37 #include <linux/atomic.h>
 38 #include <asm/byteorder.h>
 39 #include <asm/current.h>
 40 #include <linux/uaccess.h>
 41 #include <asm/ioctls.h>
 42 #include <linux/stddef.h>
 43 #include <linux/slab.h>
 44 #include <linux/errno.h>
 45 #include <linux/kernel.h>
 46 #include <linux/export.h>
 47 #include <linux/spinlock.h>
 48 #include <linux/sockios.h>
 49 #include <linux/socket.h>
 50 #include <linux/in.h>
 51 #include <linux/mroute.h>
 52 #include <linux/netdevice.h>
 53 #include <linux/in_route.h>
 54 #include <linux/route.h>
 55 #include <linux/skbuff.h>
 56 #include <linux/igmp.h>
 57 #include <net/net_namespace.h>
 58 #include <net/dst.h>
 59 #include <net/sock.h>
 60 #include <linux/ip.h>
 61 #include <linux/net.h>
 62 #include <net/ip.h>
 63 #include <net/icmp.h>
 64 #include <net/udp.h>
 65 #include <net/raw.h>
 66 #include <net/snmp.h>
 67 #include <net/tcp_states.h>
 68 #include <net/inet_common.h>
 69 #include <net/checksum.h>
 70 #include <net/xfrm.h>
 71 #include <linux/rtnetlink.h>
 72 #include <linux/proc_fs.h>
 73 #include <linux/seq_file.h>
 74 #include <linux/netfilter.h>
 75 #include <linux/netfilter_ipv4.h>
 76 #include <linux/compat.h>
 77 #include <linux/uio.h>
 78 
 79 struct raw_frag_vec {
 80         struct msghdr *msg;
 81         union {
 82                 struct icmphdr icmph;
 83                 char c[1];
 84         } hdr;
 85         int hlen;
 86 };
 87 
 88 struct raw_hashinfo raw_v4_hashinfo = {
 89         .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
 90 };
 91 EXPORT_SYMBOL_GPL(raw_v4_hashinfo);
 92 
 93 int raw_hash_sk(struct sock *sk)
 94 {
 95         struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
 96         struct hlist_head *head;
 97 
 98         head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
 99 
100         write_lock_bh(&h->lock);
101         sk_add_node(sk, head);
102         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
103         write_unlock_bh(&h->lock);
104 
105         return 0;
106 }
107 EXPORT_SYMBOL_GPL(raw_hash_sk);
108 
109 void raw_unhash_sk(struct sock *sk)
110 {
111         struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
112 
113         write_lock_bh(&h->lock);
114         if (sk_del_node_init(sk))
115                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
116         write_unlock_bh(&h->lock);
117 }
118 EXPORT_SYMBOL_GPL(raw_unhash_sk);
119 
120 struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
121                              unsigned short num, __be32 raddr, __be32 laddr,
122                              int dif, int sdif)
123 {
124         sk_for_each_from(sk) {
125                 struct inet_sock *inet = inet_sk(sk);
126 
127                 if (net_eq(sock_net(sk), net) && inet->inet_num == num  &&
128                     !(inet->inet_daddr && inet->inet_daddr != raddr)    &&
129                     !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
130                     raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
131                         goto found; /* gotcha */
132         }
133         sk = NULL;
134 found:
135         return sk;
136 }
137 EXPORT_SYMBOL_GPL(__raw_v4_lookup);
138 
139 /*
140  *      0 - deliver
141  *      1 - block
142  */
143 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
144 {
145         struct icmphdr _hdr;
146         const struct icmphdr *hdr;
147 
148         hdr = skb_header_pointer(skb, skb_transport_offset(skb),
149                                  sizeof(_hdr), &_hdr);
150         if (!hdr)
151                 return 1;
152 
153         if (hdr->type < 32) {
154                 __u32 data = raw_sk(sk)->filter.data;
155 
156                 return ((1U << hdr->type) & data) != 0;
157         }
158 
159         /* Do not block unknown ICMP types */
160         return 0;
161 }
162 
163 /* IP input processing comes here for RAW socket delivery.
164  * Caller owns SKB, so we must make clones.
165  *
166  * RFC 1122: SHOULD pass TOS value up to the transport layer.
167  * -> It does. And not only TOS, but all IP header.
168  */
169 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
170 {
171         int sdif = inet_sdif(skb);
172         int dif = inet_iif(skb);
173         struct sock *sk;
174         struct hlist_head *head;
175         int delivered = 0;
176         struct net *net;
177 
178         read_lock(&raw_v4_hashinfo.lock);
179         head = &raw_v4_hashinfo.ht[hash];
180         if (hlist_empty(head))
181                 goto out;
182 
183         net = dev_net(skb->dev);
184         sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
185                              iph->saddr, iph->daddr, dif, sdif);
186 
187         while (sk) {
188                 delivered = 1;
189                 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
190                     ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
191                                    skb->dev->ifindex, sdif)) {
192                         struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
193 
194                         /* Not releasing hash table! */
195                         if (clone)
196                                 raw_rcv(sk, clone);
197                 }
198                 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
199                                      iph->saddr, iph->daddr,
200                                      dif, sdif);
201         }
202 out:
203         read_unlock(&raw_v4_hashinfo.lock);
204         return delivered;
205 }
206 
207 int raw_local_deliver(struct sk_buff *skb, int protocol)
208 {
209         int hash;
210         struct sock *raw_sk;
211 
212         hash = protocol & (RAW_HTABLE_SIZE - 1);
213         raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
214 
215         /* If there maybe a raw socket we must check - if not we
216          * don't care less
217          */
218         if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
219                 raw_sk = NULL;
220 
221         return raw_sk != NULL;
222 
223 }
224 
225 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
226 {
227         struct inet_sock *inet = inet_sk(sk);
228         const int type = icmp_hdr(skb)->type;
229         const int code = icmp_hdr(skb)->code;
230         int err = 0;
231         int harderr = 0;
232 
233         if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
234                 ipv4_sk_update_pmtu(skb, sk, info);
235         else if (type == ICMP_REDIRECT) {
236                 ipv4_sk_redirect(skb, sk);
237                 return;
238         }
239 
240         /* Report error on raw socket, if:
241            1. User requested ip_recverr.
242            2. Socket is connected (otherwise the error indication
243               is useless without ip_recverr and error is hard.
244          */
245         if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
246                 return;
247 
248         switch (type) {
249         default:
250         case ICMP_TIME_EXCEEDED:
251                 err = EHOSTUNREACH;
252                 break;
253         case ICMP_SOURCE_QUENCH:
254                 return;
255         case ICMP_PARAMETERPROB:
256                 err = EPROTO;
257                 harderr = 1;
258                 break;
259         case ICMP_DEST_UNREACH:
260                 err = EHOSTUNREACH;
261                 if (code > NR_ICMP_UNREACH)
262                         break;
263                 err = icmp_err_convert[code].errno;
264                 harderr = icmp_err_convert[code].fatal;
265                 if (code == ICMP_FRAG_NEEDED) {
266                         harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
267                         err = EMSGSIZE;
268                 }
269         }
270 
271         if (inet->recverr) {
272                 const struct iphdr *iph = (const struct iphdr *)skb->data;
273                 u8 *payload = skb->data + (iph->ihl << 2);
274 
275                 if (inet->hdrincl)
276                         payload = skb->data;
277                 ip_icmp_error(sk, skb, err, 0, info, payload);
278         }
279 
280         if (inet->recverr || harderr) {
281                 sk->sk_err = err;
282                 sk->sk_error_report(sk);
283         }
284 }
285 
286 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
287 {
288         int hash;
289         struct sock *raw_sk;
290         const struct iphdr *iph;
291         struct net *net;
292 
293         hash = protocol & (RAW_HTABLE_SIZE - 1);
294 
295         read_lock(&raw_v4_hashinfo.lock);
296         raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
297         if (raw_sk) {
298                 int dif = skb->dev->ifindex;
299                 int sdif = inet_sdif(skb);
300 
301                 iph = (const struct iphdr *)skb->data;
302                 net = dev_net(skb->dev);
303 
304                 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
305                                                 iph->daddr, iph->saddr,
306                                                 dif, sdif)) != NULL) {
307                         raw_err(raw_sk, skb, info);
308                         raw_sk = sk_next(raw_sk);
309                         iph = (const struct iphdr *)skb->data;
310                 }
311         }
312         read_unlock(&raw_v4_hashinfo.lock);
313 }
314 
315 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
316 {
317         /* Charge it to the socket. */
318 
319         ipv4_pktinfo_prepare(sk, skb);
320         if (sock_queue_rcv_skb(sk, skb) < 0) {
321                 kfree_skb(skb);
322                 return NET_RX_DROP;
323         }
324 
325         return NET_RX_SUCCESS;
326 }
327 
328 int raw_rcv(struct sock *sk, struct sk_buff *skb)
329 {
330         if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
331                 atomic_inc(&sk->sk_drops);
332                 kfree_skb(skb);
333                 return NET_RX_DROP;
334         }
335         nf_reset_ct(skb);
336 
337         skb_push(skb, skb->data - skb_network_header(skb));
338 
339         raw_rcv_skb(sk, skb);
340         return 0;
341 }
342 
343 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
344                            struct msghdr *msg, size_t length,
345                            struct rtable **rtp, unsigned int flags,
346                            const struct sockcm_cookie *sockc)
347 {
348         struct inet_sock *inet = inet_sk(sk);
349         struct net *net = sock_net(sk);
350         struct iphdr *iph;
351         struct sk_buff *skb;
352         unsigned int iphlen;
353         int err;
354         struct rtable *rt = *rtp;
355         int hlen, tlen;
356 
357         if (length > rt->dst.dev->mtu) {
358                 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
359                                rt->dst.dev->mtu);
360                 return -EMSGSIZE;
361         }
362         if (length < sizeof(struct iphdr))
363                 return -EINVAL;
364 
365         if (flags&MSG_PROBE)
366                 goto out;
367 
368         hlen = LL_RESERVED_SPACE(rt->dst.dev);
369         tlen = rt->dst.dev->needed_tailroom;
370         skb = sock_alloc_send_skb(sk,
371                                   length + hlen + tlen + 15,
372                                   flags & MSG_DONTWAIT, &err);
373         if (!skb)
374                 goto error;
375         skb_reserve(skb, hlen);
376 
377         skb->priority = sk->sk_priority;
378         skb->mark = sockc->mark;
379         skb->tstamp = sockc->transmit_time;
380         skb_dst_set(skb, &rt->dst);
381         *rtp = NULL;
382 
383         skb_reset_network_header(skb);
384         iph = ip_hdr(skb);
385         skb_put(skb, length);
386 
387         skb->ip_summed = CHECKSUM_NONE;
388 
389         skb_setup_tx_timestamp(skb, sockc->tsflags);
390 
391         if (flags & MSG_CONFIRM)
392                 skb_set_dst_pending_confirm(skb, 1);
393 
394         skb->transport_header = skb->network_header;
395         err = -EFAULT;
396         if (memcpy_from_msg(iph, msg, length))
397                 goto error_free;
398 
399         iphlen = iph->ihl * 4;
400 
401         /*
402          * We don't want to modify the ip header, but we do need to
403          * be sure that it won't cause problems later along the network
404          * stack.  Specifically we want to make sure that iph->ihl is a
405          * sane value.  If ihl points beyond the length of the buffer passed
406          * in, reject the frame as invalid
407          */
408         err = -EINVAL;
409         if (iphlen > length)
410                 goto error_free;
411 
412         if (iphlen >= sizeof(*iph)) {
413                 if (!iph->saddr)
414                         iph->saddr = fl4->saddr;
415                 iph->check   = 0;
416                 iph->tot_len = htons(length);
417                 if (!iph->id)
418                         ip_select_ident(net, skb, NULL);
419 
420                 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
421                 skb->transport_header += iphlen;
422                 if (iph->protocol == IPPROTO_ICMP &&
423                     length >= iphlen + sizeof(struct icmphdr))
424                         icmp_out_count(net, ((struct icmphdr *)
425                                 skb_transport_header(skb))->type);
426         }
427 
428         err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
429                       net, sk, skb, NULL, rt->dst.dev,
430                       dst_output);
431         if (err > 0)
432                 err = net_xmit_errno(err);
433         if (err)
434                 goto error;
435 out:
436         return 0;
437 
438 error_free:
439         kfree_skb(skb);
440 error:
441         IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
442         if (err == -ENOBUFS && !inet->recverr)
443                 err = 0;
444         return err;
445 }
446 
447 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
448 {
449         int err;
450 
451         if (fl4->flowi4_proto != IPPROTO_ICMP)
452                 return 0;
453 
454         /* We only need the first two bytes. */
455         rfv->hlen = 2;
456 
457         err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
458         if (err)
459                 return err;
460 
461         fl4->fl4_icmp_type = rfv->hdr.icmph.type;
462         fl4->fl4_icmp_code = rfv->hdr.icmph.code;
463 
464         return 0;
465 }
466 
467 static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
468                        struct sk_buff *skb)
469 {
470         struct raw_frag_vec *rfv = from;
471 
472         if (offset < rfv->hlen) {
473                 int copy = min(rfv->hlen - offset, len);
474 
475                 if (skb->ip_summed == CHECKSUM_PARTIAL)
476                         memcpy(to, rfv->hdr.c + offset, copy);
477                 else
478                         skb->csum = csum_block_add(
479                                 skb->csum,
480                                 csum_partial_copy_nocheck(rfv->hdr.c + offset,
481                                                           to, copy, 0),
482                                 odd);
483 
484                 odd = 0;
485                 offset += copy;
486                 to += copy;
487                 len -= copy;
488 
489                 if (!len)
490                         return 0;
491         }
492 
493         offset -= rfv->hlen;
494 
495         return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
496 }
497 
498 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
499 {
500         struct inet_sock *inet = inet_sk(sk);
501         struct net *net = sock_net(sk);
502         struct ipcm_cookie ipc;
503         struct rtable *rt = NULL;
504         struct flowi4 fl4;
505         int free = 0;
506         __be32 daddr;
507         __be32 saddr;
508         u8  tos;
509         int err;
510         struct ip_options_data opt_copy;
511         struct raw_frag_vec rfv;
512         int hdrincl;
513 
514         err = -EMSGSIZE;
515         if (len > 0xFFFF)
516                 goto out;
517 
518         /* hdrincl should be READ_ONCE(inet->hdrincl)
519          * but READ_ONCE() doesn't work with bit fields.
520          * Doing this indirectly yields the same result.
521          */
522         hdrincl = inet->hdrincl;
523         hdrincl = READ_ONCE(hdrincl);
524         /*
525          *      Check the flags.
526          */
527 
528         err = -EOPNOTSUPP;
529         if (msg->msg_flags & MSG_OOB)   /* Mirror BSD error message */
530                 goto out;               /* compatibility */
531 
532         /*
533          *      Get and verify the address.
534          */
535 
536         if (msg->msg_namelen) {
537                 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
538                 err = -EINVAL;
539                 if (msg->msg_namelen < sizeof(*usin))
540                         goto out;
541                 if (usin->sin_family != AF_INET) {
542                         pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
543                                      __func__, current->comm);
544                         err = -EAFNOSUPPORT;
545                         if (usin->sin_family)
546                                 goto out;
547                 }
548                 daddr = usin->sin_addr.s_addr;
549                 /* ANK: I did not forget to get protocol from port field.
550                  * I just do not know, who uses this weirdness.
551                  * IP_HDRINCL is much more convenient.
552                  */
553         } else {
554                 err = -EDESTADDRREQ;
555                 if (sk->sk_state != TCP_ESTABLISHED)
556                         goto out;
557                 daddr = inet->inet_daddr;
558         }
559 
560         ipcm_init_sk(&ipc, inet);
561 
562         if (msg->msg_controllen) {
563                 err = ip_cmsg_send(sk, msg, &ipc, false);
564                 if (unlikely(err)) {
565                         kfree(ipc.opt);
566                         goto out;
567                 }
568                 if (ipc.opt)
569                         free = 1;
570         }
571 
572         saddr = ipc.addr;
573         ipc.addr = daddr;
574 
575         if (!ipc.opt) {
576                 struct ip_options_rcu *inet_opt;
577 
578                 rcu_read_lock();
579                 inet_opt = rcu_dereference(inet->inet_opt);
580                 if (inet_opt) {
581                         memcpy(&opt_copy, inet_opt,
582                                sizeof(*inet_opt) + inet_opt->opt.optlen);
583                         ipc.opt = &opt_copy.opt;
584                 }
585                 rcu_read_unlock();
586         }
587 
588         if (ipc.opt) {
589                 err = -EINVAL;
590                 /* Linux does not mangle headers on raw sockets,
591                  * so that IP options + IP_HDRINCL is non-sense.
592                  */
593                 if (hdrincl)
594                         goto done;
595                 if (ipc.opt->opt.srr) {
596                         if (!daddr)
597                                 goto done;
598                         daddr = ipc.opt->opt.faddr;
599                 }
600         }
601         tos = get_rtconn_flags(&ipc, sk);
602         if (msg->msg_flags & MSG_DONTROUTE)
603                 tos |= RTO_ONLINK;
604 
605         if (ipv4_is_multicast(daddr)) {
606                 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
607                         ipc.oif = inet->mc_index;
608                 if (!saddr)
609                         saddr = inet->mc_addr;
610         } else if (!ipc.oif) {
611                 ipc.oif = inet->uc_index;
612         } else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
613                 /* oif is set, packet is to local broadcast
614                  * and uc_index is set. oif is most likely set
615                  * by sk_bound_dev_if. If uc_index != oif check if the
616                  * oif is an L3 master and uc_index is an L3 slave.
617                  * If so, we want to allow the send using the uc_index.
618                  */
619                 if (ipc.oif != inet->uc_index &&
620                     ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
621                                                               inet->uc_index)) {
622                         ipc.oif = inet->uc_index;
623                 }
624         }
625 
626         flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos,
627                            RT_SCOPE_UNIVERSE,
628                            hdrincl ? IPPROTO_RAW : sk->sk_protocol,
629                            inet_sk_flowi_flags(sk) |
630                             (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
631                            daddr, saddr, 0, 0, sk->sk_uid);
632 
633         if (!hdrincl) {
634                 rfv.msg = msg;
635                 rfv.hlen = 0;
636 
637                 err = raw_probe_proto_opt(&rfv, &fl4);
638                 if (err)
639                         goto done;
640         }
641 
642         security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
643         rt = ip_route_output_flow(net, &fl4, sk);
644         if (IS_ERR(rt)) {
645                 err = PTR_ERR(rt);
646                 rt = NULL;
647                 goto done;
648         }
649 
650         err = -EACCES;
651         if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
652                 goto done;
653 
654         if (msg->msg_flags & MSG_CONFIRM)
655                 goto do_confirm;
656 back_from_confirm:
657 
658         if (hdrincl)
659                 err = raw_send_hdrinc(sk, &fl4, msg, len,
660                                       &rt, msg->msg_flags, &ipc.sockc);
661 
662          else {
663                 if (!ipc.addr)
664                         ipc.addr = fl4.daddr;
665                 lock_sock(sk);
666                 err = ip_append_data(sk, &fl4, raw_getfrag,
667                                      &rfv, len, 0,
668                                      &ipc, &rt, msg->msg_flags);
669                 if (err)
670                         ip_flush_pending_frames(sk);
671                 else if (!(msg->msg_flags & MSG_MORE)) {
672                         err = ip_push_pending_frames(sk, &fl4);
673                         if (err == -ENOBUFS && !inet->recverr)
674                                 err = 0;
675                 }
676                 release_sock(sk);
677         }
678 done:
679         if (free)
680                 kfree(ipc.opt);
681         ip_rt_put(rt);
682 
683 out:
684         if (err < 0)
685                 return err;
686         return len;
687 
688 do_confirm:
689         if (msg->msg_flags & MSG_PROBE)
690                 dst_confirm_neigh(&rt->dst, &fl4.daddr);
691         if (!(msg->msg_flags & MSG_PROBE) || len)
692                 goto back_from_confirm;
693         err = 0;
694         goto done;
695 }
696 
697 static void raw_close(struct sock *sk, long timeout)
698 {
699         /*
700          * Raw sockets may have direct kernel references. Kill them.
701          */
702         ip_ra_control(sk, 0, NULL);
703 
704         sk_common_release(sk);
705 }
706 
707 static void raw_destroy(struct sock *sk)
708 {
709         lock_sock(sk);
710         ip_flush_pending_frames(sk);
711         release_sock(sk);
712 }
713 
714 /* This gets rid of all the nasties in af_inet. -DaveM */
715 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
716 {
717         struct inet_sock *inet = inet_sk(sk);
718         struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
719         u32 tb_id = RT_TABLE_LOCAL;
720         int ret = -EINVAL;
721         int chk_addr_ret;
722 
723         if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
724                 goto out;
725 
726         if (sk->sk_bound_dev_if)
727                 tb_id = l3mdev_fib_table_by_index(sock_net(sk),
728                                                  sk->sk_bound_dev_if) ? : tb_id;
729 
730         chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr,
731                                             tb_id);
732 
733         ret = -EADDRNOTAVAIL;
734         if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
735             chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
736                 goto out;
737         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
738         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
739                 inet->inet_saddr = 0;  /* Use device */
740         sk_dst_reset(sk);
741         ret = 0;
742 out:    return ret;
743 }
744 
745 /*
746  *      This should be easy, if there is something there
747  *      we return it, otherwise we block.
748  */
749 
750 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
751                        int noblock, int flags, int *addr_len)
752 {
753         struct inet_sock *inet = inet_sk(sk);
754         size_t copied = 0;
755         int err = -EOPNOTSUPP;
756         DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
757         struct sk_buff *skb;
758 
759         if (flags & MSG_OOB)
760                 goto out;
761 
762         if (flags & MSG_ERRQUEUE) {
763                 err = ip_recv_error(sk, msg, len, addr_len);
764                 goto out;
765         }
766 
767         skb = skb_recv_datagram(sk, flags, noblock, &err);
768         if (!skb)
769                 goto out;
770         if (ccs_socket_post_recvmsg_permission(sk, skb, flags)) {
771                 err = -EAGAIN; /* Hope less harmful than -EPERM. */
772                 goto out;
773         }
774 
775         copied = skb->len;
776         if (len < copied) {
777                 msg->msg_flags |= MSG_TRUNC;
778                 copied = len;
779         }
780 
781         err = skb_copy_datagram_msg(skb, 0, msg, copied);
782         if (err)
783                 goto done;
784 
785         sock_recv_ts_and_drops(msg, sk, skb);
786 
787         /* Copy the address. */
788         if (sin) {
789                 sin->sin_family = AF_INET;
790                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
791                 sin->sin_port = 0;
792                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
793                 *addr_len = sizeof(*sin);
794         }
795         if (inet->cmsg_flags)
796                 ip_cmsg_recv(msg, skb);
797         if (flags & MSG_TRUNC)
798                 copied = skb->len;
799 done:
800         skb_free_datagram(sk, skb);
801 out:
802         if (err)
803                 return err;
804         return copied;
805 }
806 
807 static int raw_sk_init(struct sock *sk)
808 {
809         struct raw_sock *rp = raw_sk(sk);
810 
811         if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
812                 memset(&rp->filter, 0, sizeof(rp->filter));
813         return 0;
814 }
815 
816 static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen)
817 {
818         if (optlen > sizeof(struct icmp_filter))
819                 optlen = sizeof(struct icmp_filter);
820         if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen))
821                 return -EFAULT;
822         return 0;
823 }
824 
825 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
826 {
827         int len, ret = -EFAULT;
828 
829         if (get_user(len, optlen))
830                 goto out;
831         ret = -EINVAL;
832         if (len < 0)
833                 goto out;
834         if (len > sizeof(struct icmp_filter))
835                 len = sizeof(struct icmp_filter);
836         ret = -EFAULT;
837         if (put_user(len, optlen) ||
838             copy_to_user(optval, &raw_sk(sk)->filter, len))
839                 goto out;
840         ret = 0;
841 out:    return ret;
842 }
843 
844 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
845                              sockptr_t optval, unsigned int optlen)
846 {
847         if (optname == ICMP_FILTER) {
848                 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
849                         return -EOPNOTSUPP;
850                 else
851                         return raw_seticmpfilter(sk, optval, optlen);
852         }
853         return -ENOPROTOOPT;
854 }
855 
856 static int raw_setsockopt(struct sock *sk, int level, int optname,
857                           sockptr_t optval, unsigned int optlen)
858 {
859         if (level != SOL_RAW)
860                 return ip_setsockopt(sk, level, optname, optval, optlen);
861         return do_raw_setsockopt(sk, level, optname, optval, optlen);
862 }
863 
864 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
865                           char __user *optval, int __user *optlen)
866 {
867         if (optname == ICMP_FILTER) {
868                 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
869                         return -EOPNOTSUPP;
870                 else
871                         return raw_geticmpfilter(sk, optval, optlen);
872         }
873         return -ENOPROTOOPT;
874 }
875 
876 static int raw_getsockopt(struct sock *sk, int level, int optname,
877                           char __user *optval, int __user *optlen)
878 {
879         if (level != SOL_RAW)
880                 return ip_getsockopt(sk, level, optname, optval, optlen);
881         return do_raw_getsockopt(sk, level, optname, optval, optlen);
882 }
883 
884 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
885 {
886         switch (cmd) {
887         case SIOCOUTQ: {
888                 int amount = sk_wmem_alloc_get(sk);
889 
890                 return put_user(amount, (int __user *)arg);
891         }
892         case SIOCINQ: {
893                 struct sk_buff *skb;
894                 int amount = 0;
895 
896                 spin_lock_bh(&sk->sk_receive_queue.lock);
897                 skb = skb_peek(&sk->sk_receive_queue);
898                 if (skb)
899                         amount = skb->len;
900                 spin_unlock_bh(&sk->sk_receive_queue.lock);
901                 return put_user(amount, (int __user *)arg);
902         }
903 
904         default:
905 #ifdef CONFIG_IP_MROUTE
906                 return ipmr_ioctl(sk, cmd, (void __user *)arg);
907 #else
908                 return -ENOIOCTLCMD;
909 #endif
910         }
911 }
912 
913 #ifdef CONFIG_COMPAT
914 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
915 {
916         switch (cmd) {
917         case SIOCOUTQ:
918         case SIOCINQ:
919                 return -ENOIOCTLCMD;
920         default:
921 #ifdef CONFIG_IP_MROUTE
922                 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
923 #else
924                 return -ENOIOCTLCMD;
925 #endif
926         }
927 }
928 #endif
929 
930 int raw_abort(struct sock *sk, int err)
931 {
932         lock_sock(sk);
933 
934         sk->sk_err = err;
935         sk->sk_error_report(sk);
936         __udp_disconnect(sk, 0);
937 
938         release_sock(sk);
939 
940         return 0;
941 }
942 EXPORT_SYMBOL_GPL(raw_abort);
943 
944 struct proto raw_prot = {
945         .name              = "RAW",
946         .owner             = THIS_MODULE,
947         .close             = raw_close,
948         .destroy           = raw_destroy,
949         .connect           = ip4_datagram_connect,
950         .disconnect        = __udp_disconnect,
951         .ioctl             = raw_ioctl,
952         .init              = raw_sk_init,
953         .setsockopt        = raw_setsockopt,
954         .getsockopt        = raw_getsockopt,
955         .sendmsg           = raw_sendmsg,
956         .recvmsg           = raw_recvmsg,
957         .bind              = raw_bind,
958         .backlog_rcv       = raw_rcv_skb,
959         .release_cb        = ip4_datagram_release_cb,
960         .hash              = raw_hash_sk,
961         .unhash            = raw_unhash_sk,
962         .obj_size          = sizeof(struct raw_sock),
963         .useroffset        = offsetof(struct raw_sock, filter),
964         .usersize          = sizeof_field(struct raw_sock, filter),
965         .h.raw_hash        = &raw_v4_hashinfo,
966 #ifdef CONFIG_COMPAT
967         .compat_ioctl      = compat_raw_ioctl,
968 #endif
969         .diag_destroy      = raw_abort,
970 };
971 
972 #ifdef CONFIG_PROC_FS
973 static struct sock *raw_get_first(struct seq_file *seq)
974 {
975         struct sock *sk;
976         struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
977         struct raw_iter_state *state = raw_seq_private(seq);
978 
979         for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
980                         ++state->bucket) {
981                 sk_for_each(sk, &h->ht[state->bucket])
982                         if (sock_net(sk) == seq_file_net(seq))
983                                 goto found;
984         }
985         sk = NULL;
986 found:
987         return sk;
988 }
989 
990 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
991 {
992         struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
993         struct raw_iter_state *state = raw_seq_private(seq);
994 
995         do {
996                 sk = sk_next(sk);
997 try_again:
998                 ;
999         } while (sk && sock_net(sk) != seq_file_net(seq));
1000 
1001         if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
1002                 sk = sk_head(&h->ht[state->bucket]);
1003                 goto try_again;
1004         }
1005         return sk;
1006 }
1007 
1008 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
1009 {
1010         struct sock *sk = raw_get_first(seq);
1011 
1012         if (sk)
1013                 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
1014                         --pos;
1015         return pos ? NULL : sk;
1016 }
1017 
1018 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
1019         __acquires(&h->lock)
1020 {
1021         struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
1022 
1023         read_lock(&h->lock);
1024         return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1025 }
1026 EXPORT_SYMBOL_GPL(raw_seq_start);
1027 
1028 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1029 {
1030         struct sock *sk;
1031 
1032         if (v == SEQ_START_TOKEN)
1033                 sk = raw_get_first(seq);
1034         else
1035                 sk = raw_get_next(seq, v);
1036         ++*pos;
1037         return sk;
1038 }
1039 EXPORT_SYMBOL_GPL(raw_seq_next);
1040 
1041 void raw_seq_stop(struct seq_file *seq, void *v)
1042         __releases(&h->lock)
1043 {
1044         struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
1045 
1046         read_unlock(&h->lock);
1047 }
1048 EXPORT_SYMBOL_GPL(raw_seq_stop);
1049 
1050 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1051 {
1052         struct inet_sock *inet = inet_sk(sp);
1053         __be32 dest = inet->inet_daddr,
1054                src = inet->inet_rcv_saddr;
1055         __u16 destp = 0,
1056               srcp  = inet->inet_num;
1057 
1058         seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
1059                 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
1060                 i, src, srcp, dest, destp, sp->sk_state,
1061                 sk_wmem_alloc_get(sp),
1062                 sk_rmem_alloc_get(sp),
1063                 0, 0L, 0,
1064                 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1065                 0, sock_i_ino(sp),
1066                 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1067 }
1068 
1069 static int raw_seq_show(struct seq_file *seq, void *v)
1070 {
1071         if (v == SEQ_START_TOKEN)
1072                 seq_printf(seq, "  sl  local_address rem_address   st tx_queue "
1073                                 "rx_queue tr tm->when retrnsmt   uid  timeout "
1074                                 "inode ref pointer drops\n");
1075         else
1076                 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1077         return 0;
1078 }
1079 
1080 static const struct seq_operations raw_seq_ops = {
1081         .start = raw_seq_start,
1082         .next  = raw_seq_next,
1083         .stop  = raw_seq_stop,
1084         .show  = raw_seq_show,
1085 };
1086 
1087 static __net_init int raw_init_net(struct net *net)
1088 {
1089         if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops,
1090                         sizeof(struct raw_iter_state), &raw_v4_hashinfo))
1091                 return -ENOMEM;
1092 
1093         return 0;
1094 }
1095 
1096 static __net_exit void raw_exit_net(struct net *net)
1097 {
1098         remove_proc_entry("raw", net->proc_net);
1099 }
1100 
1101 static __net_initdata struct pernet_operations raw_net_ops = {
1102         .init = raw_init_net,
1103         .exit = raw_exit_net,
1104 };
1105 
1106 int __init raw_proc_init(void)
1107 {
1108         return register_pernet_subsys(&raw_net_ops);
1109 }
1110 
1111 void __init raw_proc_exit(void)
1112 {
1113         unregister_pernet_subsys(&raw_net_ops);
1114 }
1115 #endif /* CONFIG_PROC_FS */
1116 
1117 static void raw_sysctl_init_net(struct net *net)
1118 {
1119 #ifdef CONFIG_NET_L3_MASTER_DEV
1120         net->ipv4.sysctl_raw_l3mdev_accept = 1;
1121 #endif
1122 }
1123 
1124 static int __net_init raw_sysctl_init(struct net *net)
1125 {
1126         raw_sysctl_init_net(net);
1127         return 0;
1128 }
1129 
1130 static struct pernet_operations __net_initdata raw_sysctl_ops = {
1131         .init   = raw_sysctl_init,
1132 };
1133 
1134 void __init raw_init(void)
1135 {
1136         raw_sysctl_init_net(&init_net);
1137         if (register_pernet_subsys(&raw_sysctl_ops))
1138                 panic("RAW: failed to init sysctl parameters.\n");
1139 }
1140 

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