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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
79struct raw_frag_vec {
80 struct msghdr *msg;
81 union {
82 struct icmphdr icmph;
83 char c[1];
84 } hdr;
85 int hlen;
86};
87
88struct raw_hashinfo raw_v4_hashinfo;
89EXPORT_SYMBOL_GPL(raw_v4_hashinfo);
90
91int 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}
106EXPORT_SYMBOL_GPL(raw_hash_sk);
107
108void 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}
117EXPORT_SYMBOL_GPL(raw_unhash_sk);
118
119bool 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}
131EXPORT_SYMBOL_GPL(raw_v4_match);
132
133/*
134 * 0 - deliver
135 * 1 - block
136 */
137static 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 */
163static 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 delivered = 1;
179 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
180 ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
181 skb->dev->ifindex, sdif)) {
182 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
183
184 /* Not releasing hash table! */
185 if (clone)
186 raw_rcv(sk, clone);
187 }
188 }
189 rcu_read_unlock();
190 return delivered;
191}
192
193int raw_local_deliver(struct sk_buff *skb, int protocol)
194{
195 struct net *net = dev_net(skb->dev);
196
197 return raw_v4_input(net, skb, ip_hdr(skb),
198 raw_hashfunc(net, protocol));
199}
200
201static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
202{
203 struct inet_sock *inet = inet_sk(sk);
204 const int type = icmp_hdr(skb)->type;
205 const int code = icmp_hdr(skb)->code;
206 int harderr = 0;
207 bool recverr;
208 int err = 0;
209
210 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
211 ipv4_sk_update_pmtu(skb, sk, info);
212 else if (type == ICMP_REDIRECT) {
213 ipv4_sk_redirect(skb, sk);
214 return;
215 }
216
217 /* Report error on raw socket, if:
218 1. User requested ip_recverr.
219 2. Socket is connected (otherwise the error indication
220 is useless without ip_recverr and error is hard.
221 */
222 recverr = inet_test_bit(RECVERR, sk);
223 if (!recverr && sk->sk_state != TCP_ESTABLISHED)
224 return;
225
226 switch (type) {
227 default:
228 case ICMP_TIME_EXCEEDED:
229 err = EHOSTUNREACH;
230 break;
231 case ICMP_SOURCE_QUENCH:
232 return;
233 case ICMP_PARAMETERPROB:
234 err = EPROTO;
235 harderr = 1;
236 break;
237 case ICMP_DEST_UNREACH:
238 err = EHOSTUNREACH;
239 if (code > NR_ICMP_UNREACH)
240 break;
241 if (code == ICMP_FRAG_NEEDED) {
242 harderr = READ_ONCE(inet->pmtudisc) != IP_PMTUDISC_DONT;
243 err = EMSGSIZE;
244 } else {
245 err = icmp_err_convert[code].errno;
246 harderr = icmp_err_convert[code].fatal;
247 }
248 }
249
250 if (recverr) {
251 const struct iphdr *iph = (const struct iphdr *)skb->data;
252 u8 *payload = skb->data + (iph->ihl << 2);
253
254 if (inet_test_bit(HDRINCL, sk))
255 payload = skb->data;
256 ip_icmp_error(sk, skb, err, 0, info, payload);
257 }
258
259 if (recverr || harderr) {
260 sk->sk_err = err;
261 sk_error_report(sk);
262 }
263}
264
265void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
266{
267 struct net *net = dev_net(skb->dev);
268 int dif = skb->dev->ifindex;
269 int sdif = inet_sdif(skb);
270 struct hlist_head *hlist;
271 const struct iphdr *iph;
272 struct sock *sk;
273 int hash;
274
275 hash = raw_hashfunc(net, protocol);
276 hlist = &raw_v4_hashinfo.ht[hash];
277
278 rcu_read_lock();
279 sk_for_each_rcu(sk, hlist) {
280 iph = (const struct iphdr *)skb->data;
281 if (!raw_v4_match(net, sk, iph->protocol,
282 iph->daddr, iph->saddr, dif, sdif))
283 continue;
284 raw_err(sk, skb, info);
285 }
286 rcu_read_unlock();
287}
288
289static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
290{
291 enum skb_drop_reason reason;
292
293 /* Charge it to the socket. */
294
295 ipv4_pktinfo_prepare(sk, skb, true);
296 if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) {
297 kfree_skb_reason(skb, reason);
298 return NET_RX_DROP;
299 }
300
301 return NET_RX_SUCCESS;
302}
303
304int raw_rcv(struct sock *sk, struct sk_buff *skb)
305{
306 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
307 atomic_inc(&sk->sk_drops);
308 kfree_skb_reason(skb, SKB_DROP_REASON_XFRM_POLICY);
309 return NET_RX_DROP;
310 }
311 nf_reset_ct(skb);
312
313 skb_push(skb, skb->data - skb_network_header(skb));
314
315 raw_rcv_skb(sk, skb);
316 return 0;
317}
318
319static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
320 struct msghdr *msg, size_t length,
321 struct rtable **rtp, unsigned int flags,
322 const struct sockcm_cookie *sockc)
323{
324 struct inet_sock *inet = inet_sk(sk);
325 struct net *net = sock_net(sk);
326 struct iphdr *iph;
327 struct sk_buff *skb;
328 unsigned int iphlen;
329 int err;
330 struct rtable *rt = *rtp;
331 int hlen, tlen;
332
333 if (length > rt->dst.dev->mtu) {
334 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
335 rt->dst.dev->mtu);
336 return -EMSGSIZE;
337 }
338 if (length < sizeof(struct iphdr))
339 return -EINVAL;
340
341 if (flags&MSG_PROBE)
342 goto out;
343
344 hlen = LL_RESERVED_SPACE(rt->dst.dev);
345 tlen = rt->dst.dev->needed_tailroom;
346 skb = sock_alloc_send_skb(sk,
347 length + hlen + tlen + 15,
348 flags & MSG_DONTWAIT, &err);
349 if (!skb)
350 goto error;
351 skb_reserve(skb, hlen);
352
353 skb->priority = READ_ONCE(sk->sk_priority);
354 skb->mark = sockc->mark;
355 skb->tstamp = sockc->transmit_time;
356 skb_dst_set(skb, &rt->dst);
357 *rtp = NULL;
358
359 skb_reset_network_header(skb);
360 iph = ip_hdr(skb);
361 skb_put(skb, length);
362
363 skb->ip_summed = CHECKSUM_NONE;
364
365 skb_setup_tx_timestamp(skb, sockc->tsflags);
366
367 if (flags & MSG_CONFIRM)
368 skb_set_dst_pending_confirm(skb, 1);
369
370 skb->transport_header = skb->network_header;
371 err = -EFAULT;
372 if (memcpy_from_msg(iph, msg, length))
373 goto error_free;
374
375 iphlen = iph->ihl * 4;
376
377 /*
378 * We don't want to modify the ip header, but we do need to
379 * be sure that it won't cause problems later along the network
380 * stack. Specifically we want to make sure that iph->ihl is a
381 * sane value. If ihl points beyond the length of the buffer passed
382 * in, reject the frame as invalid
383 */
384 err = -EINVAL;
385 if (iphlen > length)
386 goto error_free;
387
388 if (iphlen >= sizeof(*iph)) {
389 if (!iph->saddr)
390 iph->saddr = fl4->saddr;
391 iph->check = 0;
392 iph->tot_len = htons(length);
393 if (!iph->id)
394 ip_select_ident(net, skb, NULL);
395
396 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
397 skb->transport_header += iphlen;
398 if (iph->protocol == IPPROTO_ICMP &&
399 length >= iphlen + sizeof(struct icmphdr))
400 icmp_out_count(net, ((struct icmphdr *)
401 skb_transport_header(skb))->type);
402 }
403
404 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
405 net, sk, skb, NULL, rt->dst.dev,
406 dst_output);
407 if (err > 0)
408 err = net_xmit_errno(err);
409 if (err)
410 goto error;
411out:
412 return 0;
413
414error_free:
415 kfree_skb(skb);
416error:
417 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
418 if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk))
419 err = 0;
420 return err;
421}
422
423static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
424{
425 int err;
426
427 if (fl4->flowi4_proto != IPPROTO_ICMP)
428 return 0;
429
430 /* We only need the first two bytes. */
431 rfv->hlen = 2;
432
433 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
434 if (err)
435 return err;
436
437 fl4->fl4_icmp_type = rfv->hdr.icmph.type;
438 fl4->fl4_icmp_code = rfv->hdr.icmph.code;
439
440 return 0;
441}
442
443static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
444 struct sk_buff *skb)
445{
446 struct raw_frag_vec *rfv = from;
447
448 if (offset < rfv->hlen) {
449 int copy = min(rfv->hlen - offset, len);
450
451 if (skb->ip_summed == CHECKSUM_PARTIAL)
452 memcpy(to, rfv->hdr.c + offset, copy);
453 else
454 skb->csum = csum_block_add(
455 skb->csum,
456 csum_partial_copy_nocheck(rfv->hdr.c + offset,
457 to, copy),
458 odd);
459
460 odd = 0;
461 offset += copy;
462 to += copy;
463 len -= copy;
464
465 if (!len)
466 return 0;
467 }
468
469 offset -= rfv->hlen;
470
471 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
472}
473
474static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
475{
476 struct inet_sock *inet = inet_sk(sk);
477 struct net *net = sock_net(sk);
478 struct ipcm_cookie ipc;
479 struct rtable *rt = NULL;
480 struct flowi4 fl4;
481 u8 tos, scope;
482 int free = 0;
483 __be32 daddr;
484 __be32 saddr;
485 int uc_index, err;
486 struct ip_options_data opt_copy;
487 struct raw_frag_vec rfv;
488 int hdrincl;
489
490 err = -EMSGSIZE;
491 if (len > 0xFFFF)
492 goto out;
493
494 hdrincl = inet_test_bit(HDRINCL, sk);
495
496 /*
497 * Check the flags.
498 */
499
500 err = -EOPNOTSUPP;
501 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
502 goto out; /* compatibility */
503
504 /*
505 * Get and verify the address.
506 */
507
508 if (msg->msg_namelen) {
509 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
510 err = -EINVAL;
511 if (msg->msg_namelen < sizeof(*usin))
512 goto out;
513 if (usin->sin_family != AF_INET) {
514 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
515 __func__, current->comm);
516 err = -EAFNOSUPPORT;
517 if (usin->sin_family)
518 goto out;
519 }
520 daddr = usin->sin_addr.s_addr;
521 /* ANK: I did not forget to get protocol from port field.
522 * I just do not know, who uses this weirdness.
523 * IP_HDRINCL is much more convenient.
524 */
525 } else {
526 err = -EDESTADDRREQ;
527 if (sk->sk_state != TCP_ESTABLISHED)
528 goto out;
529 daddr = inet->inet_daddr;
530 }
531
532 ipcm_init_sk(&ipc, inet);
533 /* Keep backward compat */
534 if (hdrincl)
535 ipc.protocol = IPPROTO_RAW;
536
537 if (msg->msg_controllen) {
538 err = ip_cmsg_send(sk, msg, &ipc, false);
539 if (unlikely(err)) {
540 kfree(ipc.opt);
541 goto out;
542 }
543 if (ipc.opt)
544 free = 1;
545 }
546
547 saddr = ipc.addr;
548 ipc.addr = daddr;
549
550 if (!ipc.opt) {
551 struct ip_options_rcu *inet_opt;
552
553 rcu_read_lock();
554 inet_opt = rcu_dereference(inet->inet_opt);
555 if (inet_opt) {
556 memcpy(&opt_copy, inet_opt,
557 sizeof(*inet_opt) + inet_opt->opt.optlen);
558 ipc.opt = &opt_copy.opt;
559 }
560 rcu_read_unlock();
561 }
562
563 if (ipc.opt) {
564 err = -EINVAL;
565 /* Linux does not mangle headers on raw sockets,
566 * so that IP options + IP_HDRINCL is non-sense.
567 */
568 if (hdrincl)
569 goto done;
570 if (ipc.opt->opt.srr) {
571 if (!daddr)
572 goto done;
573 daddr = ipc.opt->opt.faddr;
574 }
575 }
576 tos = get_rttos(&ipc, inet);
577 scope = ip_sendmsg_scope(inet, &ipc, msg);
578
579 uc_index = READ_ONCE(inet->uc_index);
580 if (ipv4_is_multicast(daddr)) {
581 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
582 ipc.oif = READ_ONCE(inet->mc_index);
583 if (!saddr)
584 saddr = READ_ONCE(inet->mc_addr);
585 } else if (!ipc.oif) {
586 ipc.oif = uc_index;
587 } else if (ipv4_is_lbcast(daddr) && uc_index) {
588 /* oif is set, packet is to local broadcast
589 * and uc_index is set. oif is most likely set
590 * by sk_bound_dev_if. If uc_index != oif check if the
591 * oif is an L3 master and uc_index is an L3 slave.
592 * If so, we want to allow the send using the uc_index.
593 */
594 if (ipc.oif != uc_index &&
595 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
596 uc_index)) {
597 ipc.oif = uc_index;
598 }
599 }
600
601 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, scope,
602 hdrincl ? ipc.protocol : sk->sk_protocol,
603 inet_sk_flowi_flags(sk) |
604 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
605 daddr, saddr, 0, 0, sk->sk_uid);
606
607 if (!hdrincl) {
608 rfv.msg = msg;
609 rfv.hlen = 0;
610
611 err = raw_probe_proto_opt(&rfv, &fl4);
612 if (err)
613 goto done;
614 }
615
616 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4));
617 rt = ip_route_output_flow(net, &fl4, sk);
618 if (IS_ERR(rt)) {
619 err = PTR_ERR(rt);
620 rt = NULL;
621 goto done;
622 }
623
624 err = -EACCES;
625 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
626 goto done;
627
628 if (msg->msg_flags & MSG_CONFIRM)
629 goto do_confirm;
630back_from_confirm:
631
632 if (hdrincl)
633 err = raw_send_hdrinc(sk, &fl4, msg, len,
634 &rt, msg->msg_flags, &ipc.sockc);
635
636 else {
637 if (!ipc.addr)
638 ipc.addr = fl4.daddr;
639 lock_sock(sk);
640 err = ip_append_data(sk, &fl4, raw_getfrag,
641 &rfv, len, 0,
642 &ipc, &rt, msg->msg_flags);
643 if (err)
644 ip_flush_pending_frames(sk);
645 else if (!(msg->msg_flags & MSG_MORE)) {
646 err = ip_push_pending_frames(sk, &fl4);
647 if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk))
648 err = 0;
649 }
650 release_sock(sk);
651 }
652done:
653 if (free)
654 kfree(ipc.opt);
655 ip_rt_put(rt);
656
657out:
658 if (err < 0)
659 return err;
660 return len;
661
662do_confirm:
663 if (msg->msg_flags & MSG_PROBE)
664 dst_confirm_neigh(&rt->dst, &fl4.daddr);
665 if (!(msg->msg_flags & MSG_PROBE) || len)
666 goto back_from_confirm;
667 err = 0;
668 goto done;
669}
670
671static void raw_close(struct sock *sk, long timeout)
672{
673 /*
674 * Raw sockets may have direct kernel references. Kill them.
675 */
676 ip_ra_control(sk, 0, NULL);
677
678 sk_common_release(sk);
679}
680
681static void raw_destroy(struct sock *sk)
682{
683 lock_sock(sk);
684 ip_flush_pending_frames(sk);
685 release_sock(sk);
686}
687
688/* This gets rid of all the nasties in af_inet. -DaveM */
689static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
690{
691 struct inet_sock *inet = inet_sk(sk);
692 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
693 struct net *net = sock_net(sk);
694 u32 tb_id = RT_TABLE_LOCAL;
695 int ret = -EINVAL;
696 int chk_addr_ret;
697
698 lock_sock(sk);
699 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
700 goto out;
701
702 if (sk->sk_bound_dev_if)
703 tb_id = l3mdev_fib_table_by_index(net,
704 sk->sk_bound_dev_if) ? : tb_id;
705
706 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
707
708 ret = -EADDRNOTAVAIL;
709 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
710 chk_addr_ret))
711 goto out;
712
713 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
714 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
715 inet->inet_saddr = 0; /* Use device */
716 sk_dst_reset(sk);
717 ret = 0;
718out:
719 release_sock(sk);
720 return ret;
721}
722
723/*
724 * This should be easy, if there is something there
725 * we return it, otherwise we block.
726 */
727
728static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
729 int flags, int *addr_len)
730{
731 struct inet_sock *inet = inet_sk(sk);
732 size_t copied = 0;
733 int err = -EOPNOTSUPP;
734 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
735 struct sk_buff *skb;
736
737 if (flags & MSG_OOB)
738 goto out;
739
740 if (flags & MSG_ERRQUEUE) {
741 err = ip_recv_error(sk, msg, len, addr_len);
742 goto out;
743 }
744
745 skb = skb_recv_datagram(sk, flags, &err);
746 if (!skb)
747 goto out;
748
749 copied = skb->len;
750 if (len < copied) {
751 msg->msg_flags |= MSG_TRUNC;
752 copied = len;
753 }
754
755 err = skb_copy_datagram_msg(skb, 0, msg, copied);
756 if (err)
757 goto done;
758
759 sock_recv_cmsgs(msg, sk, skb);
760
761 /* Copy the address. */
762 if (sin) {
763 sin->sin_family = AF_INET;
764 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
765 sin->sin_port = 0;
766 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
767 *addr_len = sizeof(*sin);
768 }
769 if (inet_cmsg_flags(inet))
770 ip_cmsg_recv(msg, skb);
771 if (flags & MSG_TRUNC)
772 copied = skb->len;
773done:
774 skb_free_datagram(sk, skb);
775out:
776 if (err)
777 return err;
778 return copied;
779}
780
781static int raw_sk_init(struct sock *sk)
782{
783 struct raw_sock *rp = raw_sk(sk);
784
785 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
786 memset(&rp->filter, 0, sizeof(rp->filter));
787 return 0;
788}
789
790static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen)
791{
792 if (optlen > sizeof(struct icmp_filter))
793 optlen = sizeof(struct icmp_filter);
794 if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen))
795 return -EFAULT;
796 return 0;
797}
798
799static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
800{
801 int len, ret = -EFAULT;
802
803 if (get_user(len, optlen))
804 goto out;
805 ret = -EINVAL;
806 if (len < 0)
807 goto out;
808 if (len > sizeof(struct icmp_filter))
809 len = sizeof(struct icmp_filter);
810 ret = -EFAULT;
811 if (put_user(len, optlen) ||
812 copy_to_user(optval, &raw_sk(sk)->filter, len))
813 goto out;
814 ret = 0;
815out: return ret;
816}
817
818static int do_raw_setsockopt(struct sock *sk, int level, int optname,
819 sockptr_t optval, unsigned int optlen)
820{
821 if (optname == ICMP_FILTER) {
822 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
823 return -EOPNOTSUPP;
824 else
825 return raw_seticmpfilter(sk, optval, optlen);
826 }
827 return -ENOPROTOOPT;
828}
829
830static int raw_setsockopt(struct sock *sk, int level, int optname,
831 sockptr_t optval, unsigned int optlen)
832{
833 if (level != SOL_RAW)
834 return ip_setsockopt(sk, level, optname, optval, optlen);
835 return do_raw_setsockopt(sk, level, optname, optval, optlen);
836}
837
838static int do_raw_getsockopt(struct sock *sk, int level, int optname,
839 char __user *optval, int __user *optlen)
840{
841 if (optname == ICMP_FILTER) {
842 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
843 return -EOPNOTSUPP;
844 else
845 return raw_geticmpfilter(sk, optval, optlen);
846 }
847 return -ENOPROTOOPT;
848}
849
850static int raw_getsockopt(struct sock *sk, int level, int optname,
851 char __user *optval, int __user *optlen)
852{
853 if (level != SOL_RAW)
854 return ip_getsockopt(sk, level, optname, optval, optlen);
855 return do_raw_getsockopt(sk, level, optname, optval, optlen);
856}
857
858static int raw_ioctl(struct sock *sk, int cmd, int *karg)
859{
860 switch (cmd) {
861 case SIOCOUTQ: {
862 *karg = sk_wmem_alloc_get(sk);
863 return 0;
864 }
865 case SIOCINQ: {
866 struct sk_buff *skb;
867
868 spin_lock_bh(&sk->sk_receive_queue.lock);
869 skb = skb_peek(&sk->sk_receive_queue);
870 if (skb)
871 *karg = skb->len;
872 else
873 *karg = 0;
874 spin_unlock_bh(&sk->sk_receive_queue.lock);
875 return 0;
876 }
877
878 default:
879#ifdef CONFIG_IP_MROUTE
880 return ipmr_ioctl(sk, cmd, karg);
881#else
882 return -ENOIOCTLCMD;
883#endif
884 }
885}
886
887#ifdef CONFIG_COMPAT
888static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
889{
890 switch (cmd) {
891 case SIOCOUTQ:
892 case SIOCINQ:
893 return -ENOIOCTLCMD;
894 default:
895#ifdef CONFIG_IP_MROUTE
896 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
897#else
898 return -ENOIOCTLCMD;
899#endif
900 }
901}
902#endif
903
904int raw_abort(struct sock *sk, int err)
905{
906 lock_sock(sk);
907
908 sk->sk_err = err;
909 sk_error_report(sk);
910 __udp_disconnect(sk, 0);
911
912 release_sock(sk);
913
914 return 0;
915}
916EXPORT_SYMBOL_GPL(raw_abort);
917
918struct proto raw_prot = {
919 .name = "RAW",
920 .owner = THIS_MODULE,
921 .close = raw_close,
922 .destroy = raw_destroy,
923 .connect = ip4_datagram_connect,
924 .disconnect = __udp_disconnect,
925 .ioctl = raw_ioctl,
926 .init = raw_sk_init,
927 .setsockopt = raw_setsockopt,
928 .getsockopt = raw_getsockopt,
929 .sendmsg = raw_sendmsg,
930 .recvmsg = raw_recvmsg,
931 .bind = raw_bind,
932 .backlog_rcv = raw_rcv_skb,
933 .release_cb = ip4_datagram_release_cb,
934 .hash = raw_hash_sk,
935 .unhash = raw_unhash_sk,
936 .obj_size = sizeof(struct raw_sock),
937 .useroffset = offsetof(struct raw_sock, filter),
938 .usersize = sizeof_field(struct raw_sock, filter),
939 .h.raw_hash = &raw_v4_hashinfo,
940#ifdef CONFIG_COMPAT
941 .compat_ioctl = compat_raw_ioctl,
942#endif
943 .diag_destroy = raw_abort,
944};
945
946#ifdef CONFIG_PROC_FS
947static struct sock *raw_get_first(struct seq_file *seq, int bucket)
948{
949 struct raw_hashinfo *h = pde_data(file_inode(seq->file));
950 struct raw_iter_state *state = raw_seq_private(seq);
951 struct hlist_head *hlist;
952 struct sock *sk;
953
954 for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE;
955 ++state->bucket) {
956 hlist = &h->ht[state->bucket];
957 sk_for_each(sk, hlist) {
958 if (sock_net(sk) == seq_file_net(seq))
959 return sk;
960 }
961 }
962 return NULL;
963}
964
965static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
966{
967 struct raw_iter_state *state = raw_seq_private(seq);
968
969 do {
970 sk = sk_next(sk);
971 } while (sk && sock_net(sk) != seq_file_net(seq));
972
973 if (!sk)
974 return raw_get_first(seq, state->bucket + 1);
975 return sk;
976}
977
978static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
979{
980 struct sock *sk = raw_get_first(seq, 0);
981
982 if (sk)
983 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
984 --pos;
985 return pos ? NULL : sk;
986}
987
988void *raw_seq_start(struct seq_file *seq, loff_t *pos)
989 __acquires(&h->lock)
990{
991 struct raw_hashinfo *h = pde_data(file_inode(seq->file));
992
993 spin_lock(&h->lock);
994
995 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
996}
997EXPORT_SYMBOL_GPL(raw_seq_start);
998
999void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1000{
1001 struct sock *sk;
1002
1003 if (v == SEQ_START_TOKEN)
1004 sk = raw_get_first(seq, 0);
1005 else
1006 sk = raw_get_next(seq, v);
1007 ++*pos;
1008 return sk;
1009}
1010EXPORT_SYMBOL_GPL(raw_seq_next);
1011
1012void raw_seq_stop(struct seq_file *seq, void *v)
1013 __releases(&h->lock)
1014{
1015 struct raw_hashinfo *h = pde_data(file_inode(seq->file));
1016
1017 spin_unlock(&h->lock);
1018}
1019EXPORT_SYMBOL_GPL(raw_seq_stop);
1020
1021static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1022{
1023 struct inet_sock *inet = inet_sk(sp);
1024 __be32 dest = inet->inet_daddr,
1025 src = inet->inet_rcv_saddr;
1026 __u16 destp = 0,
1027 srcp = inet->inet_num;
1028
1029 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
1030 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
1031 i, src, srcp, dest, destp, sp->sk_state,
1032 sk_wmem_alloc_get(sp),
1033 sk_rmem_alloc_get(sp),
1034 0, 0L, 0,
1035 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1036 0, sock_i_ino(sp),
1037 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1038}
1039
1040static int raw_seq_show(struct seq_file *seq, void *v)
1041{
1042 if (v == SEQ_START_TOKEN)
1043 seq_printf(seq, " sl local_address rem_address st tx_queue "
1044 "rx_queue tr tm->when retrnsmt uid timeout "
1045 "inode ref pointer drops\n");
1046 else
1047 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1048 return 0;
1049}
1050
1051static const struct seq_operations raw_seq_ops = {
1052 .start = raw_seq_start,
1053 .next = raw_seq_next,
1054 .stop = raw_seq_stop,
1055 .show = raw_seq_show,
1056};
1057
1058static __net_init int raw_init_net(struct net *net)
1059{
1060 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops,
1061 sizeof(struct raw_iter_state), &raw_v4_hashinfo))
1062 return -ENOMEM;
1063
1064 return 0;
1065}
1066
1067static __net_exit void raw_exit_net(struct net *net)
1068{
1069 remove_proc_entry("raw", net->proc_net);
1070}
1071
1072static __net_initdata struct pernet_operations raw_net_ops = {
1073 .init = raw_init_net,
1074 .exit = raw_exit_net,
1075};
1076
1077int __init raw_proc_init(void)
1078{
1079
1080 return register_pernet_subsys(&raw_net_ops);
1081}
1082
1083void __init raw_proc_exit(void)
1084{
1085 unregister_pernet_subsys(&raw_net_ops);
1086}
1087#endif /* CONFIG_PROC_FS */
1088
1089static void raw_sysctl_init_net(struct net *net)
1090{
1091#ifdef CONFIG_NET_L3_MASTER_DEV
1092 net->ipv4.sysctl_raw_l3mdev_accept = 1;
1093#endif
1094}
1095
1096static int __net_init raw_sysctl_init(struct net *net)
1097{
1098 raw_sysctl_init_net(net);
1099 return 0;
1100}
1101
1102static struct pernet_operations __net_initdata raw_sysctl_ops = {
1103 .init = raw_sysctl_init,
1104};
1105
1106void __init raw_init(void)
1107{
1108 raw_sysctl_init_net(&init_net);
1109 if (register_pernet_subsys(&raw_sysctl_ops))
1110 panic("RAW: failed to init sysctl parameters.\n");
1111}
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * RAW - implementation of IP "raw" sockets.
7 *
8 * Authors: Ross Biro
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 *
11 * Fixes:
12 * Alan Cox : verify_area() fixed up
13 * Alan Cox : ICMP error handling
14 * Alan Cox : EMSGSIZE if you send too big a packet
15 * Alan Cox : Now uses generic datagrams and shared
16 * skbuff library. No more peek crashes,
17 * no more backlogs
18 * Alan Cox : Checks sk->broadcast.
19 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram
20 * Alan Cox : Raw passes ip options too
21 * Alan Cox : Setsocketopt added
22 * Alan Cox : Fixed error return for broadcasts
23 * Alan Cox : Removed wake_up calls
24 * Alan Cox : Use ttl/tos
25 * Alan Cox : Cleaned up old debugging
26 * Alan Cox : Use new kernel side addresses
27 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets.
28 * Alan Cox : BSD style RAW socket demultiplexing.
29 * Alan Cox : Beginnings of mrouted support.
30 * Alan Cox : Added IP_HDRINCL option.
31 * Alan Cox : Skip broadcast check if BSDism set.
32 * David S. Miller : New socket lookup architecture.
33 *
34 * This program is free software; you can redistribute it and/or
35 * modify it under the terms of the GNU General Public License
36 * as published by the Free Software Foundation; either version
37 * 2 of the License, or (at your option) any later version.
38 */
39
40#include <linux/types.h>
41#include <linux/atomic.h>
42#include <asm/byteorder.h>
43#include <asm/current.h>
44#include <asm/uaccess.h>
45#include <asm/ioctls.h>
46#include <linux/stddef.h>
47#include <linux/slab.h>
48#include <linux/errno.h>
49#include <linux/aio.h>
50#include <linux/kernel.h>
51#include <linux/spinlock.h>
52#include <linux/sockios.h>
53#include <linux/socket.h>
54#include <linux/in.h>
55#include <linux/mroute.h>
56#include <linux/netdevice.h>
57#include <linux/in_route.h>
58#include <linux/route.h>
59#include <linux/skbuff.h>
60#include <net/net_namespace.h>
61#include <net/dst.h>
62#include <net/sock.h>
63#include <linux/ip.h>
64#include <linux/net.h>
65#include <net/ip.h>
66#include <net/icmp.h>
67#include <net/udp.h>
68#include <net/raw.h>
69#include <net/snmp.h>
70#include <net/tcp_states.h>
71#include <net/inet_common.h>
72#include <net/checksum.h>
73#include <net/xfrm.h>
74#include <linux/rtnetlink.h>
75#include <linux/proc_fs.h>
76#include <linux/seq_file.h>
77#include <linux/netfilter.h>
78#include <linux/netfilter_ipv4.h>
79#include <linux/compat.h>
80
81static struct raw_hashinfo raw_v4_hashinfo = {
82 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
83};
84
85void raw_hash_sk(struct sock *sk)
86{
87 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
88 struct hlist_head *head;
89
90 head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
91
92 write_lock_bh(&h->lock);
93 sk_add_node(sk, head);
94 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
95 write_unlock_bh(&h->lock);
96}
97EXPORT_SYMBOL_GPL(raw_hash_sk);
98
99void raw_unhash_sk(struct sock *sk)
100{
101 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
102
103 write_lock_bh(&h->lock);
104 if (sk_del_node_init(sk))
105 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
106 write_unlock_bh(&h->lock);
107}
108EXPORT_SYMBOL_GPL(raw_unhash_sk);
109
110static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
111 unsigned short num, __be32 raddr, __be32 laddr, int dif)
112{
113 struct hlist_node *node;
114
115 sk_for_each_from(sk, node) {
116 struct inet_sock *inet = inet_sk(sk);
117
118 if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
119 !(inet->inet_daddr && inet->inet_daddr != raddr) &&
120 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
121 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
122 goto found; /* gotcha */
123 }
124 sk = NULL;
125found:
126 return sk;
127}
128
129/*
130 * 0 - deliver
131 * 1 - block
132 */
133static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
134{
135 int type;
136
137 if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
138 return 1;
139
140 type = icmp_hdr(skb)->type;
141 if (type < 32) {
142 __u32 data = raw_sk(sk)->filter.data;
143
144 return ((1 << type) & data) != 0;
145 }
146
147 /* Do not block unknown ICMP types */
148 return 0;
149}
150
151/* IP input processing comes here for RAW socket delivery.
152 * Caller owns SKB, so we must make clones.
153 *
154 * RFC 1122: SHOULD pass TOS value up to the transport layer.
155 * -> It does. And not only TOS, but all IP header.
156 */
157static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
158{
159 struct sock *sk;
160 struct hlist_head *head;
161 int delivered = 0;
162 struct net *net;
163
164 read_lock(&raw_v4_hashinfo.lock);
165 head = &raw_v4_hashinfo.ht[hash];
166 if (hlist_empty(head))
167 goto out;
168
169 net = dev_net(skb->dev);
170 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
171 iph->saddr, iph->daddr,
172 skb->dev->ifindex);
173
174 while (sk) {
175 delivered = 1;
176 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
177 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
178
179 /* Not releasing hash table! */
180 if (clone)
181 raw_rcv(sk, clone);
182 }
183 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
184 iph->saddr, iph->daddr,
185 skb->dev->ifindex);
186 }
187out:
188 read_unlock(&raw_v4_hashinfo.lock);
189 return delivered;
190}
191
192int raw_local_deliver(struct sk_buff *skb, int protocol)
193{
194 int hash;
195 struct sock *raw_sk;
196
197 hash = protocol & (RAW_HTABLE_SIZE - 1);
198 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
199
200 /* If there maybe a raw socket we must check - if not we
201 * don't care less
202 */
203 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
204 raw_sk = NULL;
205
206 return raw_sk != NULL;
207
208}
209
210static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
211{
212 struct inet_sock *inet = inet_sk(sk);
213 const int type = icmp_hdr(skb)->type;
214 const int code = icmp_hdr(skb)->code;
215 int err = 0;
216 int harderr = 0;
217
218 /* Report error on raw socket, if:
219 1. User requested ip_recverr.
220 2. Socket is connected (otherwise the error indication
221 is useless without ip_recverr and error is hard.
222 */
223 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
224 return;
225
226 switch (type) {
227 default:
228 case ICMP_TIME_EXCEEDED:
229 err = EHOSTUNREACH;
230 break;
231 case ICMP_SOURCE_QUENCH:
232 return;
233 case ICMP_PARAMETERPROB:
234 err = EPROTO;
235 harderr = 1;
236 break;
237 case ICMP_DEST_UNREACH:
238 err = EHOSTUNREACH;
239 if (code > NR_ICMP_UNREACH)
240 break;
241 err = icmp_err_convert[code].errno;
242 harderr = icmp_err_convert[code].fatal;
243 if (code == ICMP_FRAG_NEEDED) {
244 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
245 err = EMSGSIZE;
246 }
247 }
248
249 if (inet->recverr) {
250 const struct iphdr *iph = (const struct iphdr *)skb->data;
251 u8 *payload = skb->data + (iph->ihl << 2);
252
253 if (inet->hdrincl)
254 payload = skb->data;
255 ip_icmp_error(sk, skb, err, 0, info, payload);
256 }
257
258 if (inet->recverr || harderr) {
259 sk->sk_err = err;
260 sk->sk_error_report(sk);
261 }
262}
263
264void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
265{
266 int hash;
267 struct sock *raw_sk;
268 const struct iphdr *iph;
269 struct net *net;
270
271 hash = protocol & (RAW_HTABLE_SIZE - 1);
272
273 read_lock(&raw_v4_hashinfo.lock);
274 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
275 if (raw_sk != NULL) {
276 iph = (const struct iphdr *)skb->data;
277 net = dev_net(skb->dev);
278
279 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
280 iph->daddr, iph->saddr,
281 skb->dev->ifindex)) != NULL) {
282 raw_err(raw_sk, skb, info);
283 raw_sk = sk_next(raw_sk);
284 iph = (const struct iphdr *)skb->data;
285 }
286 }
287 read_unlock(&raw_v4_hashinfo.lock);
288}
289
290static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
291{
292 /* Charge it to the socket. */
293
294 if (ip_queue_rcv_skb(sk, skb) < 0) {
295 kfree_skb(skb);
296 return NET_RX_DROP;
297 }
298
299 return NET_RX_SUCCESS;
300}
301
302int raw_rcv(struct sock *sk, struct sk_buff *skb)
303{
304 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
305 atomic_inc(&sk->sk_drops);
306 kfree_skb(skb);
307 return NET_RX_DROP;
308 }
309 nf_reset(skb);
310
311 skb_push(skb, skb->data - skb_network_header(skb));
312
313 raw_rcv_skb(sk, skb);
314 return 0;
315}
316
317static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
318 void *from, size_t length,
319 struct rtable **rtp,
320 unsigned int flags)
321{
322 struct inet_sock *inet = inet_sk(sk);
323 struct net *net = sock_net(sk);
324 struct iphdr *iph;
325 struct sk_buff *skb;
326 unsigned int iphlen;
327 int err;
328 struct rtable *rt = *rtp;
329
330 if (length > rt->dst.dev->mtu) {
331 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
332 rt->dst.dev->mtu);
333 return -EMSGSIZE;
334 }
335 if (flags&MSG_PROBE)
336 goto out;
337
338 skb = sock_alloc_send_skb(sk,
339 length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15,
340 flags & MSG_DONTWAIT, &err);
341 if (skb == NULL)
342 goto error;
343 skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev));
344
345 skb->priority = sk->sk_priority;
346 skb->mark = sk->sk_mark;
347 skb_dst_set(skb, &rt->dst);
348 *rtp = NULL;
349
350 skb_reset_network_header(skb);
351 iph = ip_hdr(skb);
352 skb_put(skb, length);
353
354 skb->ip_summed = CHECKSUM_NONE;
355
356 skb->transport_header = skb->network_header;
357 err = -EFAULT;
358 if (memcpy_fromiovecend((void *)iph, from, 0, length))
359 goto error_free;
360
361 iphlen = iph->ihl * 4;
362
363 /*
364 * We don't want to modify the ip header, but we do need to
365 * be sure that it won't cause problems later along the network
366 * stack. Specifically we want to make sure that iph->ihl is a
367 * sane value. If ihl points beyond the length of the buffer passed
368 * in, reject the frame as invalid
369 */
370 err = -EINVAL;
371 if (iphlen > length)
372 goto error_free;
373
374 if (iphlen >= sizeof(*iph)) {
375 if (!iph->saddr)
376 iph->saddr = fl4->saddr;
377 iph->check = 0;
378 iph->tot_len = htons(length);
379 if (!iph->id)
380 ip_select_ident(iph, &rt->dst, NULL);
381
382 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
383 }
384 if (iph->protocol == IPPROTO_ICMP)
385 icmp_out_count(net, ((struct icmphdr *)
386 skb_transport_header(skb))->type);
387
388 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL,
389 rt->dst.dev, dst_output);
390 if (err > 0)
391 err = net_xmit_errno(err);
392 if (err)
393 goto error;
394out:
395 return 0;
396
397error_free:
398 kfree_skb(skb);
399error:
400 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
401 if (err == -ENOBUFS && !inet->recverr)
402 err = 0;
403 return err;
404}
405
406static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg)
407{
408 struct iovec *iov;
409 u8 __user *type = NULL;
410 u8 __user *code = NULL;
411 int probed = 0;
412 unsigned int i;
413
414 if (!msg->msg_iov)
415 return 0;
416
417 for (i = 0; i < msg->msg_iovlen; i++) {
418 iov = &msg->msg_iov[i];
419 if (!iov)
420 continue;
421
422 switch (fl4->flowi4_proto) {
423 case IPPROTO_ICMP:
424 /* check if one-byte field is readable or not. */
425 if (iov->iov_base && iov->iov_len < 1)
426 break;
427
428 if (!type) {
429 type = iov->iov_base;
430 /* check if code field is readable or not. */
431 if (iov->iov_len > 1)
432 code = type + 1;
433 } else if (!code)
434 code = iov->iov_base;
435
436 if (type && code) {
437 if (get_user(fl4->fl4_icmp_type, type) ||
438 get_user(fl4->fl4_icmp_code, code))
439 return -EFAULT;
440 probed = 1;
441 }
442 break;
443 default:
444 probed = 1;
445 break;
446 }
447 if (probed)
448 break;
449 }
450 return 0;
451}
452
453static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
454 size_t len)
455{
456 struct inet_sock *inet = inet_sk(sk);
457 struct ipcm_cookie ipc;
458 struct rtable *rt = NULL;
459 struct flowi4 fl4;
460 int free = 0;
461 __be32 daddr;
462 __be32 saddr;
463 u8 tos;
464 int err;
465 struct ip_options_data opt_copy;
466
467 err = -EMSGSIZE;
468 if (len > 0xFFFF)
469 goto out;
470
471 /*
472 * Check the flags.
473 */
474
475 err = -EOPNOTSUPP;
476 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
477 goto out; /* compatibility */
478
479 /*
480 * Get and verify the address.
481 */
482
483 if (msg->msg_namelen) {
484 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
485 err = -EINVAL;
486 if (msg->msg_namelen < sizeof(*usin))
487 goto out;
488 if (usin->sin_family != AF_INET) {
489 static int complained;
490 if (!complained++)
491 printk(KERN_INFO "%s forgot to set AF_INET in "
492 "raw sendmsg. Fix it!\n",
493 current->comm);
494 err = -EAFNOSUPPORT;
495 if (usin->sin_family)
496 goto out;
497 }
498 daddr = usin->sin_addr.s_addr;
499 /* ANK: I did not forget to get protocol from port field.
500 * I just do not know, who uses this weirdness.
501 * IP_HDRINCL is much more convenient.
502 */
503 } else {
504 err = -EDESTADDRREQ;
505 if (sk->sk_state != TCP_ESTABLISHED)
506 goto out;
507 daddr = inet->inet_daddr;
508 }
509
510 ipc.addr = inet->inet_saddr;
511 ipc.opt = NULL;
512 ipc.tx_flags = 0;
513 ipc.oif = sk->sk_bound_dev_if;
514
515 if (msg->msg_controllen) {
516 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
517 if (err)
518 goto out;
519 if (ipc.opt)
520 free = 1;
521 }
522
523 saddr = ipc.addr;
524 ipc.addr = daddr;
525
526 if (!ipc.opt) {
527 struct ip_options_rcu *inet_opt;
528
529 rcu_read_lock();
530 inet_opt = rcu_dereference(inet->inet_opt);
531 if (inet_opt) {
532 memcpy(&opt_copy, inet_opt,
533 sizeof(*inet_opt) + inet_opt->opt.optlen);
534 ipc.opt = &opt_copy.opt;
535 }
536 rcu_read_unlock();
537 }
538
539 if (ipc.opt) {
540 err = -EINVAL;
541 /* Linux does not mangle headers on raw sockets,
542 * so that IP options + IP_HDRINCL is non-sense.
543 */
544 if (inet->hdrincl)
545 goto done;
546 if (ipc.opt->opt.srr) {
547 if (!daddr)
548 goto done;
549 daddr = ipc.opt->opt.faddr;
550 }
551 }
552 tos = RT_CONN_FLAGS(sk);
553 if (msg->msg_flags & MSG_DONTROUTE)
554 tos |= RTO_ONLINK;
555
556 if (ipv4_is_multicast(daddr)) {
557 if (!ipc.oif)
558 ipc.oif = inet->mc_index;
559 if (!saddr)
560 saddr = inet->mc_addr;
561 }
562
563 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
564 RT_SCOPE_UNIVERSE,
565 inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
566 inet_sk_flowi_flags(sk) | FLOWI_FLAG_CAN_SLEEP,
567 daddr, saddr, 0, 0);
568
569 if (!inet->hdrincl) {
570 err = raw_probe_proto_opt(&fl4, msg);
571 if (err)
572 goto done;
573 }
574
575 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
576 rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
577 if (IS_ERR(rt)) {
578 err = PTR_ERR(rt);
579 rt = NULL;
580 goto done;
581 }
582
583 err = -EACCES;
584 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
585 goto done;
586
587 if (msg->msg_flags & MSG_CONFIRM)
588 goto do_confirm;
589back_from_confirm:
590
591 if (inet->hdrincl)
592 err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len,
593 &rt, msg->msg_flags);
594
595 else {
596 if (!ipc.addr)
597 ipc.addr = fl4.daddr;
598 lock_sock(sk);
599 err = ip_append_data(sk, &fl4, ip_generic_getfrag,
600 msg->msg_iov, len, 0,
601 &ipc, &rt, msg->msg_flags);
602 if (err)
603 ip_flush_pending_frames(sk);
604 else if (!(msg->msg_flags & MSG_MORE)) {
605 err = ip_push_pending_frames(sk, &fl4);
606 if (err == -ENOBUFS && !inet->recverr)
607 err = 0;
608 }
609 release_sock(sk);
610 }
611done:
612 if (free)
613 kfree(ipc.opt);
614 ip_rt_put(rt);
615
616out:
617 if (err < 0)
618 return err;
619 return len;
620
621do_confirm:
622 dst_confirm(&rt->dst);
623 if (!(msg->msg_flags & MSG_PROBE) || len)
624 goto back_from_confirm;
625 err = 0;
626 goto done;
627}
628
629static void raw_close(struct sock *sk, long timeout)
630{
631 /*
632 * Raw sockets may have direct kernel references. Kill them.
633 */
634 ip_ra_control(sk, 0, NULL);
635
636 sk_common_release(sk);
637}
638
639static void raw_destroy(struct sock *sk)
640{
641 lock_sock(sk);
642 ip_flush_pending_frames(sk);
643 release_sock(sk);
644}
645
646/* This gets rid of all the nasties in af_inet. -DaveM */
647static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
648{
649 struct inet_sock *inet = inet_sk(sk);
650 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
651 int ret = -EINVAL;
652 int chk_addr_ret;
653
654 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
655 goto out;
656 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
657 ret = -EADDRNOTAVAIL;
658 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
659 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
660 goto out;
661 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
662 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
663 inet->inet_saddr = 0; /* Use device */
664 sk_dst_reset(sk);
665 ret = 0;
666out: return ret;
667}
668
669/*
670 * This should be easy, if there is something there
671 * we return it, otherwise we block.
672 */
673
674static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
675 size_t len, int noblock, int flags, int *addr_len)
676{
677 struct inet_sock *inet = inet_sk(sk);
678 size_t copied = 0;
679 int err = -EOPNOTSUPP;
680 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
681 struct sk_buff *skb;
682
683 if (flags & MSG_OOB)
684 goto out;
685
686 if (addr_len)
687 *addr_len = sizeof(*sin);
688
689 if (flags & MSG_ERRQUEUE) {
690 err = ip_recv_error(sk, msg, len);
691 goto out;
692 }
693
694 skb = skb_recv_datagram(sk, flags, noblock, &err);
695 if (!skb)
696 goto out;
697
698 copied = skb->len;
699 if (len < copied) {
700 msg->msg_flags |= MSG_TRUNC;
701 copied = len;
702 }
703
704 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
705 if (err)
706 goto done;
707
708 sock_recv_ts_and_drops(msg, sk, skb);
709
710 /* Copy the address. */
711 if (sin) {
712 sin->sin_family = AF_INET;
713 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
714 sin->sin_port = 0;
715 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
716 }
717 if (inet->cmsg_flags)
718 ip_cmsg_recv(msg, skb);
719 if (flags & MSG_TRUNC)
720 copied = skb->len;
721done:
722 skb_free_datagram(sk, skb);
723out:
724 if (err)
725 return err;
726 return copied;
727}
728
729static int raw_init(struct sock *sk)
730{
731 struct raw_sock *rp = raw_sk(sk);
732
733 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
734 memset(&rp->filter, 0, sizeof(rp->filter));
735 return 0;
736}
737
738static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
739{
740 if (optlen > sizeof(struct icmp_filter))
741 optlen = sizeof(struct icmp_filter);
742 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
743 return -EFAULT;
744 return 0;
745}
746
747static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
748{
749 int len, ret = -EFAULT;
750
751 if (get_user(len, optlen))
752 goto out;
753 ret = -EINVAL;
754 if (len < 0)
755 goto out;
756 if (len > sizeof(struct icmp_filter))
757 len = sizeof(struct icmp_filter);
758 ret = -EFAULT;
759 if (put_user(len, optlen) ||
760 copy_to_user(optval, &raw_sk(sk)->filter, len))
761 goto out;
762 ret = 0;
763out: return ret;
764}
765
766static int do_raw_setsockopt(struct sock *sk, int level, int optname,
767 char __user *optval, unsigned int optlen)
768{
769 if (optname == ICMP_FILTER) {
770 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
771 return -EOPNOTSUPP;
772 else
773 return raw_seticmpfilter(sk, optval, optlen);
774 }
775 return -ENOPROTOOPT;
776}
777
778static int raw_setsockopt(struct sock *sk, int level, int optname,
779 char __user *optval, unsigned int optlen)
780{
781 if (level != SOL_RAW)
782 return ip_setsockopt(sk, level, optname, optval, optlen);
783 return do_raw_setsockopt(sk, level, optname, optval, optlen);
784}
785
786#ifdef CONFIG_COMPAT
787static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
788 char __user *optval, unsigned int optlen)
789{
790 if (level != SOL_RAW)
791 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
792 return do_raw_setsockopt(sk, level, optname, optval, optlen);
793}
794#endif
795
796static int do_raw_getsockopt(struct sock *sk, int level, int optname,
797 char __user *optval, int __user *optlen)
798{
799 if (optname == ICMP_FILTER) {
800 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
801 return -EOPNOTSUPP;
802 else
803 return raw_geticmpfilter(sk, optval, optlen);
804 }
805 return -ENOPROTOOPT;
806}
807
808static int raw_getsockopt(struct sock *sk, int level, int optname,
809 char __user *optval, int __user *optlen)
810{
811 if (level != SOL_RAW)
812 return ip_getsockopt(sk, level, optname, optval, optlen);
813 return do_raw_getsockopt(sk, level, optname, optval, optlen);
814}
815
816#ifdef CONFIG_COMPAT
817static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
818 char __user *optval, int __user *optlen)
819{
820 if (level != SOL_RAW)
821 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
822 return do_raw_getsockopt(sk, level, optname, optval, optlen);
823}
824#endif
825
826static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
827{
828 switch (cmd) {
829 case SIOCOUTQ: {
830 int amount = sk_wmem_alloc_get(sk);
831
832 return put_user(amount, (int __user *)arg);
833 }
834 case SIOCINQ: {
835 struct sk_buff *skb;
836 int amount = 0;
837
838 spin_lock_bh(&sk->sk_receive_queue.lock);
839 skb = skb_peek(&sk->sk_receive_queue);
840 if (skb != NULL)
841 amount = skb->len;
842 spin_unlock_bh(&sk->sk_receive_queue.lock);
843 return put_user(amount, (int __user *)arg);
844 }
845
846 default:
847#ifdef CONFIG_IP_MROUTE
848 return ipmr_ioctl(sk, cmd, (void __user *)arg);
849#else
850 return -ENOIOCTLCMD;
851#endif
852 }
853}
854
855#ifdef CONFIG_COMPAT
856static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
857{
858 switch (cmd) {
859 case SIOCOUTQ:
860 case SIOCINQ:
861 return -ENOIOCTLCMD;
862 default:
863#ifdef CONFIG_IP_MROUTE
864 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
865#else
866 return -ENOIOCTLCMD;
867#endif
868 }
869}
870#endif
871
872struct proto raw_prot = {
873 .name = "RAW",
874 .owner = THIS_MODULE,
875 .close = raw_close,
876 .destroy = raw_destroy,
877 .connect = ip4_datagram_connect,
878 .disconnect = udp_disconnect,
879 .ioctl = raw_ioctl,
880 .init = raw_init,
881 .setsockopt = raw_setsockopt,
882 .getsockopt = raw_getsockopt,
883 .sendmsg = raw_sendmsg,
884 .recvmsg = raw_recvmsg,
885 .bind = raw_bind,
886 .backlog_rcv = raw_rcv_skb,
887 .hash = raw_hash_sk,
888 .unhash = raw_unhash_sk,
889 .obj_size = sizeof(struct raw_sock),
890 .h.raw_hash = &raw_v4_hashinfo,
891#ifdef CONFIG_COMPAT
892 .compat_setsockopt = compat_raw_setsockopt,
893 .compat_getsockopt = compat_raw_getsockopt,
894 .compat_ioctl = compat_raw_ioctl,
895#endif
896};
897
898#ifdef CONFIG_PROC_FS
899static struct sock *raw_get_first(struct seq_file *seq)
900{
901 struct sock *sk;
902 struct raw_iter_state *state = raw_seq_private(seq);
903
904 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
905 ++state->bucket) {
906 struct hlist_node *node;
907
908 sk_for_each(sk, node, &state->h->ht[state->bucket])
909 if (sock_net(sk) == seq_file_net(seq))
910 goto found;
911 }
912 sk = NULL;
913found:
914 return sk;
915}
916
917static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
918{
919 struct raw_iter_state *state = raw_seq_private(seq);
920
921 do {
922 sk = sk_next(sk);
923try_again:
924 ;
925 } while (sk && sock_net(sk) != seq_file_net(seq));
926
927 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
928 sk = sk_head(&state->h->ht[state->bucket]);
929 goto try_again;
930 }
931 return sk;
932}
933
934static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
935{
936 struct sock *sk = raw_get_first(seq);
937
938 if (sk)
939 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
940 --pos;
941 return pos ? NULL : sk;
942}
943
944void *raw_seq_start(struct seq_file *seq, loff_t *pos)
945{
946 struct raw_iter_state *state = raw_seq_private(seq);
947
948 read_lock(&state->h->lock);
949 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
950}
951EXPORT_SYMBOL_GPL(raw_seq_start);
952
953void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
954{
955 struct sock *sk;
956
957 if (v == SEQ_START_TOKEN)
958 sk = raw_get_first(seq);
959 else
960 sk = raw_get_next(seq, v);
961 ++*pos;
962 return sk;
963}
964EXPORT_SYMBOL_GPL(raw_seq_next);
965
966void raw_seq_stop(struct seq_file *seq, void *v)
967{
968 struct raw_iter_state *state = raw_seq_private(seq);
969
970 read_unlock(&state->h->lock);
971}
972EXPORT_SYMBOL_GPL(raw_seq_stop);
973
974static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
975{
976 struct inet_sock *inet = inet_sk(sp);
977 __be32 dest = inet->inet_daddr,
978 src = inet->inet_rcv_saddr;
979 __u16 destp = 0,
980 srcp = inet->inet_num;
981
982 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
983 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
984 i, src, srcp, dest, destp, sp->sk_state,
985 sk_wmem_alloc_get(sp),
986 sk_rmem_alloc_get(sp),
987 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
988 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
989}
990
991static int raw_seq_show(struct seq_file *seq, void *v)
992{
993 if (v == SEQ_START_TOKEN)
994 seq_printf(seq, " sl local_address rem_address st tx_queue "
995 "rx_queue tr tm->when retrnsmt uid timeout "
996 "inode ref pointer drops\n");
997 else
998 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
999 return 0;
1000}
1001
1002static const struct seq_operations raw_seq_ops = {
1003 .start = raw_seq_start,
1004 .next = raw_seq_next,
1005 .stop = raw_seq_stop,
1006 .show = raw_seq_show,
1007};
1008
1009int raw_seq_open(struct inode *ino, struct file *file,
1010 struct raw_hashinfo *h, const struct seq_operations *ops)
1011{
1012 int err;
1013 struct raw_iter_state *i;
1014
1015 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1016 if (err < 0)
1017 return err;
1018
1019 i = raw_seq_private((struct seq_file *)file->private_data);
1020 i->h = h;
1021 return 0;
1022}
1023EXPORT_SYMBOL_GPL(raw_seq_open);
1024
1025static int raw_v4_seq_open(struct inode *inode, struct file *file)
1026{
1027 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1028}
1029
1030static const struct file_operations raw_seq_fops = {
1031 .owner = THIS_MODULE,
1032 .open = raw_v4_seq_open,
1033 .read = seq_read,
1034 .llseek = seq_lseek,
1035 .release = seq_release_net,
1036};
1037
1038static __net_init int raw_init_net(struct net *net)
1039{
1040 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
1041 return -ENOMEM;
1042
1043 return 0;
1044}
1045
1046static __net_exit void raw_exit_net(struct net *net)
1047{
1048 proc_net_remove(net, "raw");
1049}
1050
1051static __net_initdata struct pernet_operations raw_net_ops = {
1052 .init = raw_init_net,
1053 .exit = raw_exit_net,
1054};
1055
1056int __init raw_proc_init(void)
1057{
1058 return register_pernet_subsys(&raw_net_ops);
1059}
1060
1061void __init raw_proc_exit(void)
1062{
1063 unregister_pernet_subsys(&raw_net_ops);
1064}
1065#endif /* CONFIG_PROC_FS */