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