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 EXPORT_SYMBOL_GPL(raw_v4_hashinfo);
90
91 int raw_hash_sk(struct sock *sk)
92 {
93 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
94 struct hlist_head *hlist;
95
96 hlist = &h->ht[raw_hashfunc(sock_net(sk), inet_sk(sk)->inet_num)];
97
98 spin_lock(&h->lock);
99 sk_add_node_rcu(sk, hlist);
100 sock_set_flag(sk, SOCK_RCU_FREE);
101 spin_unlock(&h->lock);
102 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
103
104 return 0;
105 }
106 EXPORT_SYMBOL_GPL(raw_hash_sk);
107
108 void raw_unhash_sk(struct sock *sk)
109 {
110 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
111
112 spin_lock(&h->lock);
113 if (sk_del_node_init_rcu(sk))
114 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
115 spin_unlock(&h->lock);
116 }
117 EXPORT_SYMBOL_GPL(raw_unhash_sk);
118
119 bool raw_v4_match(struct net *net, const struct sock *sk, unsigned short num,
120 __be32 raddr, __be32 laddr, int dif, int sdif)
121 {
122 const struct inet_sock *inet = inet_sk(sk);
123
124 if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
125 !(inet->inet_daddr && inet->inet_daddr != raddr) &&
126 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
127 raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
128 return true;
129 return false;
130 }
131 EXPORT_SYMBOL_GPL(raw_v4_match);
132
133 /*
134 * 0 - deliver
135 * 1 - block
136 */
137 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
138 {
139 struct icmphdr _hdr;
140 const struct icmphdr *hdr;
141
142 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
143 sizeof(_hdr), &_hdr);
144 if (!hdr)
145 return 1;
146
147 if (hdr->type < 32) {
148 __u32 data = raw_sk(sk)->filter.data;
149
150 return ((1U << hdr->type) & data) != 0;
151 }
152
153 /* Do not block unknown ICMP types */
154 return 0;
155 }
156
157 /* IP input processing comes here for RAW socket delivery.
158 * Caller owns SKB, so we must make clones.
159 *
160 * RFC 1122: SHOULD pass TOS value up to the transport layer.
161 * -> It does. And not only TOS, but all IP header.
162 */
163 static int raw_v4_input(struct net *net, struct sk_buff *skb,
164 const struct iphdr *iph, int hash)
165 {
166 int sdif = inet_sdif(skb);
167 struct hlist_head *hlist;
168 int dif = inet_iif(skb);
169 int delivered = 0;
170 struct sock *sk;
171
172 hlist = &raw_v4_hashinfo.ht[hash];
173 rcu_read_lock();
174 sk_for_each_rcu(sk, hlist) {
175 if (!raw_v4_match(net, sk, iph->protocol,
176 iph->saddr, iph->daddr, dif, sdif))
177 continue;
178
179 if (atomic_read(&sk->sk_rmem_alloc) >=
180 READ_ONCE(sk->sk_rcvbuf)) {
181 atomic_inc(&sk->sk_drops);
182 continue;
183 }
184
185 delivered = 1;
186 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
187 ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
188 skb->dev->ifindex, sdif)) {
189 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
190
191 /* Not releasing hash table! */
192 if (clone)
193 raw_rcv(sk, clone);
194 }
195 }
196 rcu_read_unlock();
197 return delivered;
198 }
199
200 int raw_local_deliver(struct sk_buff *skb, int protocol)
201 {
202 struct net *net = dev_net(skb->dev);
203
204 return raw_v4_input(net, skb, ip_hdr(skb),
205 raw_hashfunc(net, protocol));
206 }
207
208 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
209 {
210 struct inet_sock *inet = inet_sk(sk);
211 const int type = icmp_hdr(skb)->type;
212 const int code = icmp_hdr(skb)->code;
213 int harderr = 0;
214 bool recverr;
215 int err = 0;
216
217 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
218 ipv4_sk_update_pmtu(skb, sk, info);
219 else if (type == ICMP_REDIRECT) {
220 ipv4_sk_redirect(skb, sk);
221 return;
222 }
223
224 /* Report error on raw socket, if:
225 1. User requested ip_recverr.
226 2. Socket is connected (otherwise the error indication
227 is useless without ip_recverr and error is hard.
228 */
229 recverr = inet_test_bit(RECVERR, sk);
230 if (!recverr && sk->sk_state != TCP_ESTABLISHED)
231 return;
232
233 switch (type) {
234 default:
235 case ICMP_TIME_EXCEEDED:
236 err = EHOSTUNREACH;
237 break;
238 case ICMP_SOURCE_QUENCH:
239 return;
240 case ICMP_PARAMETERPROB:
241 err = EPROTO;
242 harderr = 1;
243 break;
244 case ICMP_DEST_UNREACH:
245 err = EHOSTUNREACH;
246 if (code > NR_ICMP_UNREACH)
247 break;
248 if (code == ICMP_FRAG_NEEDED) {
249 harderr = READ_ONCE(inet->pmtudisc) != IP_PMTUDISC_DONT;
250 err = EMSGSIZE;
251 } else {
252 err = icmp_err_convert[code].errno;
253 harderr = icmp_err_convert[code].fatal;
254 }
255 }
256
257 if (recverr) {
258 const struct iphdr *iph = (const struct iphdr *)skb->data;
259 u8 *payload = skb->data + (iph->ihl << 2);
260
261 if (inet_test_bit(HDRINCL, sk))
262 payload = skb->data;
263 ip_icmp_error(sk, skb, err, 0, info, payload);
264 }
265
266 if (recverr || harderr) {
267 sk->sk_err = err;
268 sk_error_report(sk);
269 }
270 }
271
272 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
273 {
274 struct net *net = dev_net(skb->dev);
275 int dif = skb->dev->ifindex;
276 int sdif = inet_sdif(skb);
277 struct hlist_head *hlist;
278 const struct iphdr *iph;
279 struct sock *sk;
280 int hash;
281
282 hash = raw_hashfunc(net, protocol);
283 hlist = &raw_v4_hashinfo.ht[hash];
284
285 rcu_read_lock();
286 sk_for_each_rcu(sk, hlist) {
287 iph = (const struct iphdr *)skb->data;
288 if (!raw_v4_match(net, sk, iph->protocol,
289 iph->daddr, iph->saddr, dif, sdif))
290 continue;
291 raw_err(sk, skb, info);
292 }
293 rcu_read_unlock();
294 }
295
296 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
297 {
298 enum skb_drop_reason reason;
299
300 /* Charge it to the socket. */
301
302 ipv4_pktinfo_prepare(sk, skb, true);
303 if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) {
304 sk_skb_reason_drop(sk, skb, reason);
305 return NET_RX_DROP;
306 }
307
308 return NET_RX_SUCCESS;
309 }
310
311 int raw_rcv(struct sock *sk, struct sk_buff *skb)
312 {
313 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
314 atomic_inc(&sk->sk_drops);
315 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_XFRM_POLICY);
316 return NET_RX_DROP;
317 }
318 nf_reset_ct(skb);
319
320 skb_push(skb, -skb_network_offset(skb));
321
322 raw_rcv_skb(sk, skb);
323 return 0;
324 }
325
326 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
327 struct msghdr *msg, size_t length,
328 struct rtable **rtp, unsigned int flags,
329 const struct sockcm_cookie *sockc)
330 {
331 struct inet_sock *inet = inet_sk(sk);
332 struct net *net = sock_net(sk);
333 struct iphdr *iph;
334 struct sk_buff *skb;
335 unsigned int iphlen;
336 int err;
337 struct rtable *rt = *rtp;
338 int hlen, tlen;
339
340 if (length > rt->dst.dev->mtu) {
341 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
342 rt->dst.dev->mtu);
343 return -EMSGSIZE;
344 }
345 if (length < sizeof(struct iphdr))
346 return -EINVAL;
347
348 if (flags&MSG_PROBE)
349 goto out;
350
351 hlen = LL_RESERVED_SPACE(rt->dst.dev);
352 tlen = rt->dst.dev->needed_tailroom;
353 skb = sock_alloc_send_skb(sk,
354 length + hlen + tlen + 15,
355 flags & MSG_DONTWAIT, &err);
356 if (!skb)
357 goto error;
358 skb_reserve(skb, hlen);
359
360 skb->protocol = htons(ETH_P_IP);
361 skb->priority = READ_ONCE(sk->sk_priority);
362 skb->mark = sockc->mark;
363 skb_set_delivery_type_by_clockid(skb, sockc->transmit_time, sk->sk_clockid);
364 skb_dst_set(skb, &rt->dst);
365 *rtp = NULL;
366
367 skb_reset_network_header(skb);
368 iph = ip_hdr(skb);
369 skb_put(skb, length);
370
371 skb->ip_summed = CHECKSUM_NONE;
372
373 skb_setup_tx_timestamp(skb, sockc->tsflags);
374
375 if (flags & MSG_CONFIRM)
376 skb_set_dst_pending_confirm(skb, 1);
377
378 skb->transport_header = skb->network_header;
379 err = -EFAULT;
380 if (memcpy_from_msg(iph, msg, length))
381 goto error_free;
382
383 iphlen = iph->ihl * 4;
384
385 /*
386 * We don't want to modify the ip header, but we do need to
387 * be sure that it won't cause problems later along the network
388 * stack. Specifically we want to make sure that iph->ihl is a
389 * sane value. If ihl points beyond the length of the buffer passed
390 * in, reject the frame as invalid
391 */
392 err = -EINVAL;
393 if (iphlen > length)
394 goto error_free;
395
396 if (iphlen >= sizeof(*iph)) {
397 if (!iph->saddr)
398 iph->saddr = fl4->saddr;
399 iph->check = 0;
400 iph->tot_len = htons(length);
401 if (!iph->id)
402 ip_select_ident(net, skb, NULL);
403
404 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
405 skb->transport_header += iphlen;
406 if (iph->protocol == IPPROTO_ICMP &&
407 length >= iphlen + sizeof(struct icmphdr))
408 icmp_out_count(net, ((struct icmphdr *)
409 skb_transport_header(skb))->type);
410 }
411
412 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
413 net, sk, skb, NULL, rt->dst.dev,
414 dst_output);
415 if (err > 0)
416 err = net_xmit_errno(err);
417 if (err)
418 goto error;
419 out:
420 return 0;
421
422 error_free:
423 kfree_skb(skb);
424 error:
425 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
426 if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk))
427 err = 0;
428 return err;
429 }
430
431 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
432 {
433 int err;
434
435 if (fl4->flowi4_proto != IPPROTO_ICMP)
436 return 0;
437
438 /* We only need the first two bytes. */
439 rfv->hlen = 2;
440
441 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
442 if (err)
443 return err;
444
445 fl4->fl4_icmp_type = rfv->hdr.icmph.type;
446 fl4->fl4_icmp_code = rfv->hdr.icmph.code;
447
448 return 0;
449 }
450
451 static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
452 struct sk_buff *skb)
453 {
454 struct raw_frag_vec *rfv = from;
455
456 if (offset < rfv->hlen) {
457 int copy = min(rfv->hlen - offset, len);
458
459 if (skb->ip_summed == CHECKSUM_PARTIAL)
460 memcpy(to, rfv->hdr.c + offset, copy);
461 else
462 skb->csum = csum_block_add(
463 skb->csum,
464 csum_partial_copy_nocheck(rfv->hdr.c + offset,
465 to, copy),
466 odd);
467
468 odd = 0;
469 offset += copy;
470 to += copy;
471 len -= copy;
472
473 if (!len)
474 return 0;
475 }
476
477 offset -= rfv->hlen;
478
479 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
480 }
481
482 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
483 {
484 struct inet_sock *inet = inet_sk(sk);
485 struct net *net = sock_net(sk);
486 struct ipcm_cookie ipc;
487 struct rtable *rt = NULL;
488 struct flowi4 fl4;
489 u8 tos, scope;
490 int free = 0;
491 __be32 daddr;
492 __be32 saddr;
493 int uc_index, err;
494 struct ip_options_data opt_copy;
495 struct raw_frag_vec rfv;
496 int hdrincl;
497
498 err = -EMSGSIZE;
499 if (len > 0xFFFF)
500 goto out;
501
502 hdrincl = inet_test_bit(HDRINCL, sk);
503
504 /*
505 * Check the flags.
506 */
507
508 err = -EOPNOTSUPP;
509 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
510 goto out; /* compatibility */
511
512 /*
513 * Get and verify the address.
514 */
515
516 if (msg->msg_namelen) {
517 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
518 err = -EINVAL;
519 if (msg->msg_namelen < sizeof(*usin))
520 goto out;
521 if (usin->sin_family != AF_INET) {
522 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
523 __func__, current->comm);
524 err = -EAFNOSUPPORT;
525 if (usin->sin_family)
526 goto out;
527 }
528 daddr = usin->sin_addr.s_addr;
529 /* ANK: I did not forget to get protocol from port field.
530 * I just do not know, who uses this weirdness.
531 * IP_HDRINCL is much more convenient.
532 */
533 } else {
534 err = -EDESTADDRREQ;
535 if (sk->sk_state != TCP_ESTABLISHED)
536 goto out;
537 daddr = inet->inet_daddr;
538 }
539
540 ipcm_init_sk(&ipc, inet);
541 /* Keep backward compat */
542 if (hdrincl)
543 ipc.protocol = IPPROTO_RAW;
544
545 if (msg->msg_controllen) {
546 err = ip_cmsg_send(sk, msg, &ipc, false);
547 if (unlikely(err)) {
548 kfree(ipc.opt);
549 goto out;
550 }
551 if (ipc.opt)
552 free = 1;
553 }
554
555 saddr = ipc.addr;
556 ipc.addr = daddr;
557
558 if (!ipc.opt) {
559 struct ip_options_rcu *inet_opt;
560
561 rcu_read_lock();
562 inet_opt = rcu_dereference(inet->inet_opt);
563 if (inet_opt) {
564 memcpy(&opt_copy, inet_opt,
565 sizeof(*inet_opt) + inet_opt->opt.optlen);
566 ipc.opt = &opt_copy.opt;
567 }
568 rcu_read_unlock();
569 }
570
571 if (ipc.opt) {
572 err = -EINVAL;
573 /* Linux does not mangle headers on raw sockets,
574 * so that IP options + IP_HDRINCL is non-sense.
575 */
576 if (hdrincl)
577 goto done;
578 if (ipc.opt->opt.srr) {
579 if (!daddr)
580 goto done;
581 daddr = ipc.opt->opt.faddr;
582 }
583 }
584 tos = get_rttos(&ipc, inet);
585 scope = ip_sendmsg_scope(inet, &ipc, msg);
586
587 uc_index = READ_ONCE(inet->uc_index);
588 if (ipv4_is_multicast(daddr)) {
589 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
590 ipc.oif = READ_ONCE(inet->mc_index);
591 if (!saddr)
592 saddr = READ_ONCE(inet->mc_addr);
593 } else if (!ipc.oif) {
594 ipc.oif = uc_index;
595 } else if (ipv4_is_lbcast(daddr) && uc_index) {
596 /* oif is set, packet is to local broadcast
597 * and uc_index is set. oif is most likely set
598 * by sk_bound_dev_if. If uc_index != oif check if the
599 * oif is an L3 master and uc_index is an L3 slave.
600 * If so, we want to allow the send using the uc_index.
601 */
602 if (ipc.oif != uc_index &&
603 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
604 uc_index)) {
605 ipc.oif = uc_index;
606 }
607 }
608
609 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, scope,
610 hdrincl ? ipc.protocol : sk->sk_protocol,
611 inet_sk_flowi_flags(sk) |
612 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
613 daddr, saddr, 0, 0, sk->sk_uid);
614
615 fl4.fl4_icmp_type = 0;
616 fl4.fl4_icmp_code = 0;
617
618 if (!hdrincl) {
619 rfv.msg = msg;
620 rfv.hlen = 0;
621
622 err = raw_probe_proto_opt(&rfv, &fl4);
623 if (err)
624 goto done;
625 }
626
627 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4));
628 rt = ip_route_output_flow(net, &fl4, sk);
629 if (IS_ERR(rt)) {
630 err = PTR_ERR(rt);
631 rt = NULL;
632 goto done;
633 }
634
635 err = -EACCES;
636 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
637 goto done;
638
639 if (msg->msg_flags & MSG_CONFIRM)
640 goto do_confirm;
641 back_from_confirm:
642
643 if (hdrincl)
644 err = raw_send_hdrinc(sk, &fl4, msg, len,
645 &rt, msg->msg_flags, &ipc.sockc);
646
647 else {
648 if (!ipc.addr)
649 ipc.addr = fl4.daddr;
650 lock_sock(sk);
651 err = ip_append_data(sk, &fl4, raw_getfrag,
652 &rfv, len, 0,
653 &ipc, &rt, msg->msg_flags);
654 if (err)
655 ip_flush_pending_frames(sk);
656 else if (!(msg->msg_flags & MSG_MORE)) {
657 err = ip_push_pending_frames(sk, &fl4);
658 if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk))
659 err = 0;
660 }
661 release_sock(sk);
662 }
663 done:
664 if (free)
665 kfree(ipc.opt);
666 ip_rt_put(rt);
667
668 out:
669 if (err < 0)
670 return err;
671 return len;
672
673 do_confirm:
674 if (msg->msg_flags & MSG_PROBE)
675 dst_confirm_neigh(&rt->dst, &fl4.daddr);
676 if (!(msg->msg_flags & MSG_PROBE) || len)
677 goto back_from_confirm;
678 err = 0;
679 goto done;
680 }
681
682 static void raw_close(struct sock *sk, long timeout)
683 {
684 /*
685 * Raw sockets may have direct kernel references. Kill them.
686 */
687 ip_ra_control(sk, 0, NULL);
688
689 sk_common_release(sk);
690 }
691
692 static void raw_destroy(struct sock *sk)
693 {
694 lock_sock(sk);
695 ip_flush_pending_frames(sk);
696 release_sock(sk);
697 }
698
699 /* This gets rid of all the nasties in af_inet. -DaveM */
700 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
701 {
702 struct inet_sock *inet = inet_sk(sk);
703 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
704 struct net *net = sock_net(sk);
705 u32 tb_id = RT_TABLE_LOCAL;
706 int ret = -EINVAL;
707 int chk_addr_ret;
708
709 lock_sock(sk);
710 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
711 goto out;
712
713 if (sk->sk_bound_dev_if)
714 tb_id = l3mdev_fib_table_by_index(net,
715 sk->sk_bound_dev_if) ? : tb_id;
716
717 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
718
719 ret = -EADDRNOTAVAIL;
720 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
721 chk_addr_ret))
722 goto out;
723
724 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
725 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
726 inet->inet_saddr = 0; /* Use device */
727 sk_dst_reset(sk);
728 ret = 0;
729 out:
730 release_sock(sk);
731 return ret;
732 }
733
734 /*
735 * This should be easy, if there is something there
736 * we return it, otherwise we block.
737 */
738
739 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
740 int flags, int *addr_len)
741 {
742 struct inet_sock *inet = inet_sk(sk);
743 size_t copied = 0;
744 int err = -EOPNOTSUPP;
745 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
746 struct sk_buff *skb;
747
748 if (flags & MSG_OOB)
749 goto out;
750
751 if (flags & MSG_ERRQUEUE) {
752 err = ip_recv_error(sk, msg, len, addr_len);
753 goto out;
754 }
755
756 skb = skb_recv_datagram(sk, flags, &err);
757 if (!skb)
758 goto out;
759 if (ccs_socket_post_recvmsg_permission(sk, skb, flags)) {
760 err = -EAGAIN; /* Hope less harmful than -EPERM. */
761 goto out;
762 }
763
764 copied = skb->len;
765 if (len < copied) {
766 msg->msg_flags |= MSG_TRUNC;
767 copied = len;
768 }
769
770 err = skb_copy_datagram_msg(skb, 0, msg, copied);
771 if (err)
772 goto done;
773
774 sock_recv_cmsgs(msg, sk, skb);
775
776 /* Copy the address. */
777 if (sin) {
778 sin->sin_family = AF_INET;
779 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
780 sin->sin_port = 0;
781 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
782 *addr_len = sizeof(*sin);
783 }
784 if (inet_cmsg_flags(inet))
785 ip_cmsg_recv(msg, skb);
786 if (flags & MSG_TRUNC)
787 copied = skb->len;
788 done:
789 skb_free_datagram(sk, skb);
790 out:
791 if (err)
792 return err;
793 return copied;
794 }
795
796 static int raw_sk_init(struct sock *sk)
797 {
798 struct raw_sock *rp = raw_sk(sk);
799
800 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
801 memset(&rp->filter, 0, sizeof(rp->filter));
802 return 0;
803 }
804
805 static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen)
806 {
807 if (optlen > sizeof(struct icmp_filter))
808 optlen = sizeof(struct icmp_filter);
809 if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen))
810 return -EFAULT;
811 return 0;
812 }
813
814 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
815 {
816 int len, ret = -EFAULT;
817
818 if (get_user(len, optlen))
819 goto out;
820 ret = -EINVAL;
821 if (len < 0)
822 goto out;
823 if (len > sizeof(struct icmp_filter))
824 len = sizeof(struct icmp_filter);
825 ret = -EFAULT;
826 if (put_user(len, optlen) ||
827 copy_to_user(optval, &raw_sk(sk)->filter, len))
828 goto out;
829 ret = 0;
830 out: return ret;
831 }
832
833 static int do_raw_setsockopt(struct sock *sk, int optname,
834 sockptr_t optval, unsigned int optlen)
835 {
836 if (optname == ICMP_FILTER) {
837 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
838 return -EOPNOTSUPP;
839 else
840 return raw_seticmpfilter(sk, optval, optlen);
841 }
842 return -ENOPROTOOPT;
843 }
844
845 static int raw_setsockopt(struct sock *sk, int level, int optname,
846 sockptr_t optval, unsigned int optlen)
847 {
848 if (level != SOL_RAW)
849 return ip_setsockopt(sk, level, optname, optval, optlen);
850 return do_raw_setsockopt(sk, optname, optval, optlen);
851 }
852
853 static int do_raw_getsockopt(struct sock *sk, int optname,
854 char __user *optval, int __user *optlen)
855 {
856 if (optname == ICMP_FILTER) {
857 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
858 return -EOPNOTSUPP;
859 else
860 return raw_geticmpfilter(sk, optval, optlen);
861 }
862 return -ENOPROTOOPT;
863 }
864
865 static int raw_getsockopt(struct sock *sk, int level, int optname,
866 char __user *optval, int __user *optlen)
867 {
868 if (level != SOL_RAW)
869 return ip_getsockopt(sk, level, optname, optval, optlen);
870 return do_raw_getsockopt(sk, optname, optval, optlen);
871 }
872
873 static int raw_ioctl(struct sock *sk, int cmd, int *karg)
874 {
875 switch (cmd) {
876 case SIOCOUTQ: {
877 *karg = sk_wmem_alloc_get(sk);
878 return 0;
879 }
880 case SIOCINQ: {
881 struct sk_buff *skb;
882
883 spin_lock_bh(&sk->sk_receive_queue.lock);
884 skb = skb_peek(&sk->sk_receive_queue);
885 if (skb)
886 *karg = skb->len;
887 else
888 *karg = 0;
889 spin_unlock_bh(&sk->sk_receive_queue.lock);
890 return 0;
891 }
892
893 default:
894 #ifdef CONFIG_IP_MROUTE
895 return ipmr_ioctl(sk, cmd, karg);
896 #else
897 return -ENOIOCTLCMD;
898 #endif
899 }
900 }
901
902 #ifdef CONFIG_COMPAT
903 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
904 {
905 switch (cmd) {
906 case SIOCOUTQ:
907 case SIOCINQ:
908 return -ENOIOCTLCMD;
909 default:
910 #ifdef CONFIG_IP_MROUTE
911 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
912 #else
913 return -ENOIOCTLCMD;
914 #endif
915 }
916 }
917 #endif
918
919 int raw_abort(struct sock *sk, int err)
920 {
921 lock_sock(sk);
922
923 sk->sk_err = err;
924 sk_error_report(sk);
925 __udp_disconnect(sk, 0);
926
927 release_sock(sk);
928
929 return 0;
930 }
931 EXPORT_SYMBOL_GPL(raw_abort);
932
933 struct proto raw_prot = {
934 .name = "RAW",
935 .owner = THIS_MODULE,
936 .close = raw_close,
937 .destroy = raw_destroy,
938 .connect = ip4_datagram_connect,
939 .disconnect = __udp_disconnect,
940 .ioctl = raw_ioctl,
941 .init = raw_sk_init,
942 .setsockopt = raw_setsockopt,
943 .getsockopt = raw_getsockopt,
944 .sendmsg = raw_sendmsg,
945 .recvmsg = raw_recvmsg,
946 .bind = raw_bind,
947 .backlog_rcv = raw_rcv_skb,
948 .release_cb = ip4_datagram_release_cb,
949 .hash = raw_hash_sk,
950 .unhash = raw_unhash_sk,
951 .obj_size = sizeof(struct raw_sock),
952 .useroffset = offsetof(struct raw_sock, filter),
953 .usersize = sizeof_field(struct raw_sock, filter),
954 .h.raw_hash = &raw_v4_hashinfo,
955 #ifdef CONFIG_COMPAT
956 .compat_ioctl = compat_raw_ioctl,
957 #endif
958 .diag_destroy = raw_abort,
959 };
960
961 #ifdef CONFIG_PROC_FS
962 static struct sock *raw_get_first(struct seq_file *seq, int bucket)
963 {
964 struct raw_hashinfo *h = pde_data(file_inode(seq->file));
965 struct raw_iter_state *state = raw_seq_private(seq);
966 struct hlist_head *hlist;
967 struct sock *sk;
968
969 for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE;
970 ++state->bucket) {
971 hlist = &h->ht[state->bucket];
972 sk_for_each(sk, hlist) {
973 if (sock_net(sk) == seq_file_net(seq))
974 return sk;
975 }
976 }
977 return NULL;
978 }
979
980 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
981 {
982 struct raw_iter_state *state = raw_seq_private(seq);
983
984 do {
985 sk = sk_next(sk);
986 } while (sk && sock_net(sk) != seq_file_net(seq));
987
988 if (!sk)
989 return raw_get_first(seq, state->bucket + 1);
990 return sk;
991 }
992
993 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
994 {
995 struct sock *sk = raw_get_first(seq, 0);
996
997 if (sk)
998 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
999 --pos;
1000 return pos ? NULL : sk;
1001 }
1002
1003 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
1004 __acquires(&h->lock)
1005 {
1006 struct raw_hashinfo *h = pde_data(file_inode(seq->file));
1007
1008 spin_lock(&h->lock);
1009
1010 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1011 }
1012 EXPORT_SYMBOL_GPL(raw_seq_start);
1013
1014 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1015 {
1016 struct sock *sk;
1017
1018 if (v == SEQ_START_TOKEN)
1019 sk = raw_get_first(seq, 0);
1020 else
1021 sk = raw_get_next(seq, v);
1022 ++*pos;
1023 return sk;
1024 }
1025 EXPORT_SYMBOL_GPL(raw_seq_next);
1026
1027 void raw_seq_stop(struct seq_file *seq, void *v)
1028 __releases(&h->lock)
1029 {
1030 struct raw_hashinfo *h = pde_data(file_inode(seq->file));
1031
1032 spin_unlock(&h->lock);
1033 }
1034 EXPORT_SYMBOL_GPL(raw_seq_stop);
1035
1036 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1037 {
1038 struct inet_sock *inet = inet_sk(sp);
1039 __be32 dest = inet->inet_daddr,
1040 src = inet->inet_rcv_saddr;
1041 __u16 destp = 0,
1042 srcp = inet->inet_num;
1043
1044 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
1045 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
1046 i, src, srcp, dest, destp, sp->sk_state,
1047 sk_wmem_alloc_get(sp),
1048 sk_rmem_alloc_get(sp),
1049 0, 0L, 0,
1050 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1051 0, sock_i_ino(sp),
1052 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1053 }
1054
1055 static int raw_seq_show(struct seq_file *seq, void *v)
1056 {
1057 if (v == SEQ_START_TOKEN)
1058 seq_printf(seq, " sl local_address rem_address st tx_queue "
1059 "rx_queue tr tm->when retrnsmt uid timeout "
1060 "inode ref pointer drops\n");
1061 else
1062 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1063 return 0;
1064 }
1065
1066 static const struct seq_operations raw_seq_ops = {
1067 .start = raw_seq_start,
1068 .next = raw_seq_next,
1069 .stop = raw_seq_stop,
1070 .show = raw_seq_show,
1071 };
1072
1073 static __net_init int raw_init_net(struct net *net)
1074 {
1075 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops,
1076 sizeof(struct raw_iter_state), &raw_v4_hashinfo))
1077 return -ENOMEM;
1078
1079 return 0;
1080 }
1081
1082 static __net_exit void raw_exit_net(struct net *net)
1083 {
1084 remove_proc_entry("raw", net->proc_net);
1085 }
1086
1087 static __net_initdata struct pernet_operations raw_net_ops = {
1088 .init = raw_init_net,
1089 .exit = raw_exit_net,
1090 };
1091
1092 int __init raw_proc_init(void)
1093 {
1094
1095 return register_pernet_subsys(&raw_net_ops);
1096 }
1097
1098 void __init raw_proc_exit(void)
1099 {
1100 unregister_pernet_subsys(&raw_net_ops);
1101 }
1102 #endif /* CONFIG_PROC_FS */
1103
1104 static void raw_sysctl_init_net(struct net *net)
1105 {
1106 #ifdef CONFIG_NET_L3_MASTER_DEV
1107 net->ipv4.sysctl_raw_l3mdev_accept = 1;
1108 #endif
1109 }
1110
1111 static int __net_init raw_sysctl_init(struct net *net)
1112 {
1113 raw_sysctl_init_net(net);
1114 return 0;
1115 }
1116
1117 static struct pernet_operations __net_initdata raw_sysctl_ops = {
1118 .init = raw_sysctl_init,
1119 };
1120
1121 void __init raw_init(void)
1122 {
1123 raw_sysctl_init_net(&init_net);
1124 if (register_pernet_subsys(&raw_sysctl_ops))
1125 panic("RAW: failed to init sysctl parameters.\n");
1126 }
1127
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