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