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[mirror_ubuntu-jammy-kernel.git] / net / ipv4 / raw.c
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 if (code == ICMP_FRAG_NEEDED) {
264 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
265 err = EMSGSIZE;
266 } else {
267 err = icmp_err_convert[code].errno;
268 harderr = icmp_err_convert[code].fatal;
269 }
270 }
271
272 if (inet->recverr) {
273 const struct iphdr *iph = (const struct iphdr *)skb->data;
274 u8 *payload = skb->data + (iph->ihl << 2);
275
276 if (inet->hdrincl)
277 payload = skb->data;
278 ip_icmp_error(sk, skb, err, 0, info, payload);
279 }
280
281 if (inet->recverr || harderr) {
282 sk->sk_err = err;
283 sk_error_report(sk);
284 }
285 }
286
287 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
288 {
289 int hash;
290 struct sock *raw_sk;
291 const struct iphdr *iph;
292 struct net *net;
293
294 hash = protocol & (RAW_HTABLE_SIZE - 1);
295
296 read_lock(&raw_v4_hashinfo.lock);
297 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
298 if (raw_sk) {
299 int dif = skb->dev->ifindex;
300 int sdif = inet_sdif(skb);
301
302 iph = (const struct iphdr *)skb->data;
303 net = dev_net(skb->dev);
304
305 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
306 iph->daddr, iph->saddr,
307 dif, sdif)) != NULL) {
308 raw_err(raw_sk, skb, info);
309 raw_sk = sk_next(raw_sk);
310 iph = (const struct iphdr *)skb->data;
311 }
312 }
313 read_unlock(&raw_v4_hashinfo.lock);
314 }
315
316 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
317 {
318 /* Charge it to the socket. */
319
320 ipv4_pktinfo_prepare(sk, skb);
321 if (sock_queue_rcv_skb(sk, skb) < 0) {
322 kfree_skb(skb);
323 return NET_RX_DROP;
324 }
325
326 return NET_RX_SUCCESS;
327 }
328
329 int raw_rcv(struct sock *sk, struct sk_buff *skb)
330 {
331 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
332 atomic_inc(&sk->sk_drops);
333 kfree_skb(skb);
334 return NET_RX_DROP;
335 }
336 nf_reset_ct(skb);
337
338 skb_push(skb, skb->data - skb_network_header(skb));
339
340 raw_rcv_skb(sk, skb);
341 return 0;
342 }
343
344 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
345 struct msghdr *msg, size_t length,
346 struct rtable **rtp, unsigned int flags,
347 const struct sockcm_cookie *sockc)
348 {
349 struct inet_sock *inet = inet_sk(sk);
350 struct net *net = sock_net(sk);
351 struct iphdr *iph;
352 struct sk_buff *skb;
353 unsigned int iphlen;
354 int err;
355 struct rtable *rt = *rtp;
356 int hlen, tlen;
357
358 if (length > rt->dst.dev->mtu) {
359 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
360 rt->dst.dev->mtu);
361 return -EMSGSIZE;
362 }
363 if (length < sizeof(struct iphdr))
364 return -EINVAL;
365
366 if (flags&MSG_PROBE)
367 goto out;
368
369 hlen = LL_RESERVED_SPACE(rt->dst.dev);
370 tlen = rt->dst.dev->needed_tailroom;
371 skb = sock_alloc_send_skb(sk,
372 length + hlen + tlen + 15,
373 flags & MSG_DONTWAIT, &err);
374 if (!skb)
375 goto error;
376 skb_reserve(skb, hlen);
377
378 skb->priority = sk->sk_priority;
379 skb->mark = sockc->mark;
380 skb->tstamp = sockc->transmit_time;
381 skb_dst_set(skb, &rt->dst);
382 *rtp = NULL;
383
384 skb_reset_network_header(skb);
385 iph = ip_hdr(skb);
386 skb_put(skb, length);
387
388 skb->ip_summed = CHECKSUM_NONE;
389
390 skb_setup_tx_timestamp(skb, sockc->tsflags);
391
392 if (flags & MSG_CONFIRM)
393 skb_set_dst_pending_confirm(skb, 1);
394
395 skb->transport_header = skb->network_header;
396 err = -EFAULT;
397 if (memcpy_from_msg(iph, msg, length))
398 goto error_free;
399
400 iphlen = iph->ihl * 4;
401
402 /*
403 * We don't want to modify the ip header, but we do need to
404 * be sure that it won't cause problems later along the network
405 * stack. Specifically we want to make sure that iph->ihl is a
406 * sane value. If ihl points beyond the length of the buffer passed
407 * in, reject the frame as invalid
408 */
409 err = -EINVAL;
410 if (iphlen > length)
411 goto error_free;
412
413 if (iphlen >= sizeof(*iph)) {
414 if (!iph->saddr)
415 iph->saddr = fl4->saddr;
416 iph->check = 0;
417 iph->tot_len = htons(length);
418 if (!iph->id)
419 ip_select_ident(net, skb, NULL);
420
421 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
422 skb->transport_header += iphlen;
423 if (iph->protocol == IPPROTO_ICMP &&
424 length >= iphlen + sizeof(struct icmphdr))
425 icmp_out_count(net, ((struct icmphdr *)
426 skb_transport_header(skb))->type);
427 }
428
429 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
430 net, sk, skb, NULL, rt->dst.dev,
431 dst_output);
432 if (err > 0)
433 err = net_xmit_errno(err);
434 if (err)
435 goto error;
436 out:
437 return 0;
438
439 error_free:
440 kfree_skb(skb);
441 error:
442 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
443 if (err == -ENOBUFS && !inet->recverr)
444 err = 0;
445 return err;
446 }
447
448 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
449 {
450 int err;
451
452 if (fl4->flowi4_proto != IPPROTO_ICMP)
453 return 0;
454
455 /* We only need the first two bytes. */
456 rfv->hlen = 2;
457
458 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
459 if (err)
460 return err;
461
462 fl4->fl4_icmp_type = rfv->hdr.icmph.type;
463 fl4->fl4_icmp_code = rfv->hdr.icmph.code;
464
465 return 0;
466 }
467
468 static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
469 struct sk_buff *skb)
470 {
471 struct raw_frag_vec *rfv = from;
472
473 if (offset < rfv->hlen) {
474 int copy = min(rfv->hlen - offset, len);
475
476 if (skb->ip_summed == CHECKSUM_PARTIAL)
477 memcpy(to, rfv->hdr.c + offset, copy);
478 else
479 skb->csum = csum_block_add(
480 skb->csum,
481 csum_partial_copy_nocheck(rfv->hdr.c + offset,
482 to, copy),
483 odd);
484
485 odd = 0;
486 offset += copy;
487 to += copy;
488 len -= copy;
489
490 if (!len)
491 return 0;
492 }
493
494 offset -= rfv->hlen;
495
496 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
497 }
498
499 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
500 {
501 struct inet_sock *inet = inet_sk(sk);
502 struct net *net = sock_net(sk);
503 struct ipcm_cookie ipc;
504 struct rtable *rt = NULL;
505 struct flowi4 fl4;
506 int free = 0;
507 __be32 daddr;
508 __be32 saddr;
509 u8 tos;
510 int err;
511 struct ip_options_data opt_copy;
512 struct raw_frag_vec rfv;
513 int hdrincl;
514
515 err = -EMSGSIZE;
516 if (len > 0xFFFF)
517 goto out;
518
519 /* hdrincl should be READ_ONCE(inet->hdrincl)
520 * but READ_ONCE() doesn't work with bit fields.
521 * Doing this indirectly yields the same result.
522 */
523 hdrincl = inet->hdrincl;
524 hdrincl = READ_ONCE(hdrincl);
525 /*
526 * Check the flags.
527 */
528
529 err = -EOPNOTSUPP;
530 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
531 goto out; /* compatibility */
532
533 /*
534 * Get and verify the address.
535 */
536
537 if (msg->msg_namelen) {
538 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
539 err = -EINVAL;
540 if (msg->msg_namelen < sizeof(*usin))
541 goto out;
542 if (usin->sin_family != AF_INET) {
543 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
544 __func__, current->comm);
545 err = -EAFNOSUPPORT;
546 if (usin->sin_family)
547 goto out;
548 }
549 daddr = usin->sin_addr.s_addr;
550 /* ANK: I did not forget to get protocol from port field.
551 * I just do not know, who uses this weirdness.
552 * IP_HDRINCL is much more convenient.
553 */
554 } else {
555 err = -EDESTADDRREQ;
556 if (sk->sk_state != TCP_ESTABLISHED)
557 goto out;
558 daddr = inet->inet_daddr;
559 }
560
561 ipcm_init_sk(&ipc, inet);
562
563 if (msg->msg_controllen) {
564 err = ip_cmsg_send(sk, msg, &ipc, false);
565 if (unlikely(err)) {
566 kfree(ipc.opt);
567 goto out;
568 }
569 if (ipc.opt)
570 free = 1;
571 }
572
573 saddr = ipc.addr;
574 ipc.addr = daddr;
575
576 if (!ipc.opt) {
577 struct ip_options_rcu *inet_opt;
578
579 rcu_read_lock();
580 inet_opt = rcu_dereference(inet->inet_opt);
581 if (inet_opt) {
582 memcpy(&opt_copy, inet_opt,
583 sizeof(*inet_opt) + inet_opt->opt.optlen);
584 ipc.opt = &opt_copy.opt;
585 }
586 rcu_read_unlock();
587 }
588
589 if (ipc.opt) {
590 err = -EINVAL;
591 /* Linux does not mangle headers on raw sockets,
592 * so that IP options + IP_HDRINCL is non-sense.
593 */
594 if (hdrincl)
595 goto done;
596 if (ipc.opt->opt.srr) {
597 if (!daddr)
598 goto done;
599 daddr = ipc.opt->opt.faddr;
600 }
601 }
602 tos = get_rtconn_flags(&ipc, sk);
603 if (msg->msg_flags & MSG_DONTROUTE)
604 tos |= RTO_ONLINK;
605
606 if (ipv4_is_multicast(daddr)) {
607 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
608 ipc.oif = inet->mc_index;
609 if (!saddr)
610 saddr = inet->mc_addr;
611 } else if (!ipc.oif) {
612 ipc.oif = inet->uc_index;
613 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
614 /* oif is set, packet is to local broadcast
615 * and uc_index is set. oif is most likely set
616 * by sk_bound_dev_if. If uc_index != oif check if the
617 * oif is an L3 master and uc_index is an L3 slave.
618 * If so, we want to allow the send using the uc_index.
619 */
620 if (ipc.oif != inet->uc_index &&
621 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
622 inet->uc_index)) {
623 ipc.oif = inet->uc_index;
624 }
625 }
626
627 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos,
628 RT_SCOPE_UNIVERSE,
629 hdrincl ? IPPROTO_RAW : sk->sk_protocol,
630 inet_sk_flowi_flags(sk) |
631 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
632 daddr, saddr, 0, 0, sk->sk_uid);
633
634 if (!hdrincl) {
635 rfv.msg = msg;
636 rfv.hlen = 0;
637
638 err = raw_probe_proto_opt(&rfv, &fl4);
639 if (err)
640 goto done;
641 }
642
643 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4));
644 rt = ip_route_output_flow(net, &fl4, sk);
645 if (IS_ERR(rt)) {
646 err = PTR_ERR(rt);
647 rt = NULL;
648 goto done;
649 }
650
651 err = -EACCES;
652 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
653 goto done;
654
655 if (msg->msg_flags & MSG_CONFIRM)
656 goto do_confirm;
657 back_from_confirm:
658
659 if (hdrincl)
660 err = raw_send_hdrinc(sk, &fl4, msg, len,
661 &rt, msg->msg_flags, &ipc.sockc);
662
663 else {
664 if (!ipc.addr)
665 ipc.addr = fl4.daddr;
666 lock_sock(sk);
667 err = ip_append_data(sk, &fl4, raw_getfrag,
668 &rfv, len, 0,
669 &ipc, &rt, msg->msg_flags);
670 if (err)
671 ip_flush_pending_frames(sk);
672 else if (!(msg->msg_flags & MSG_MORE)) {
673 err = ip_push_pending_frames(sk, &fl4);
674 if (err == -ENOBUFS && !inet->recverr)
675 err = 0;
676 }
677 release_sock(sk);
678 }
679 done:
680 if (free)
681 kfree(ipc.opt);
682 ip_rt_put(rt);
683
684 out:
685 if (err < 0)
686 return err;
687 return len;
688
689 do_confirm:
690 if (msg->msg_flags & MSG_PROBE)
691 dst_confirm_neigh(&rt->dst, &fl4.daddr);
692 if (!(msg->msg_flags & MSG_PROBE) || len)
693 goto back_from_confirm;
694 err = 0;
695 goto done;
696 }
697
698 static void raw_close(struct sock *sk, long timeout)
699 {
700 /*
701 * Raw sockets may have direct kernel references. Kill them.
702 */
703 ip_ra_control(sk, 0, NULL);
704
705 sk_common_release(sk);
706 }
707
708 static void raw_destroy(struct sock *sk)
709 {
710 lock_sock(sk);
711 ip_flush_pending_frames(sk);
712 release_sock(sk);
713 }
714
715 /* This gets rid of all the nasties in af_inet. -DaveM */
716 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
717 {
718 struct inet_sock *inet = inet_sk(sk);
719 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
720 u32 tb_id = RT_TABLE_LOCAL;
721 int ret = -EINVAL;
722 int chk_addr_ret;
723
724 lock_sock(sk);
725 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
726 goto out;
727
728 if (sk->sk_bound_dev_if)
729 tb_id = l3mdev_fib_table_by_index(sock_net(sk),
730 sk->sk_bound_dev_if) ? : tb_id;
731
732 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr,
733 tb_id);
734
735 ret = -EADDRNOTAVAIL;
736 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
737 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
738 goto out;
739 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
740 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
741 inet->inet_saddr = 0; /* Use device */
742 sk_dst_reset(sk);
743 ret = 0;
744 out:
745 release_sock(sk);
746 return ret;
747 }
748
749 /*
750 * This should be easy, if there is something there
751 * we return it, otherwise we block.
752 */
753
754 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
755 int noblock, int flags, int *addr_len)
756 {
757 struct inet_sock *inet = inet_sk(sk);
758 size_t copied = 0;
759 int err = -EOPNOTSUPP;
760 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
761 struct sk_buff *skb;
762
763 if (flags & MSG_OOB)
764 goto out;
765
766 if (flags & MSG_ERRQUEUE) {
767 err = ip_recv_error(sk, msg, len, addr_len);
768 goto out;
769 }
770
771 skb = skb_recv_datagram(sk, flags, noblock, &err);
772 if (!skb)
773 goto out;
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_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 }
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