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atomic: use <linux/atomic.h>
[linux-2.6/next.git] / net / ipv4 / raw.c
blob1457acb39cec4ca0c7f34707383f97abead4bed8
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
81 static struct raw_hashinfo raw_v4_hashinfo = {
82 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
83 };
84
85 void 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 }
97 EXPORT_SYMBOL_GPL(raw_hash_sk);
98
99 void 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 }
108 EXPORT_SYMBOL_GPL(raw_unhash_sk);
109
110 static 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;
125 found:
126 return sk;
127 }
128
129 /*
130 * 0 - deliver
131 * 1 - block
132 */
133 static __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 */
157 static 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 }
187 out:
188 read_unlock(&raw_v4_hashinfo.lock);
189 return delivered;
190 }
191
192 int 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
210 static 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
264 void 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
290 static 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
302 int 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
317 static 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;
394 out:
395 return 0;
396
397 error_free:
398 kfree_skb(skb);
399 error:
400 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
401 if (err == -ENOBUFS && !inet->recverr)
402 err = 0;
403 return err;
404 }
405
406 static 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
453 static 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 FLOWI_FLAG_CAN_SLEEP, daddr, saddr, 0, 0);
567
568 if (!inet->hdrincl) {
569 err = raw_probe_proto_opt(&fl4, msg);
570 if (err)
571 goto done;
572 }
573
574 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
575 rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
576 if (IS_ERR(rt)) {
577 err = PTR_ERR(rt);
578 rt = NULL;
579 goto done;
580 }
581
582 err = -EACCES;
583 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
584 goto done;
585
586 if (msg->msg_flags & MSG_CONFIRM)
587 goto do_confirm;
588 back_from_confirm:
589
590 if (inet->hdrincl)
591 err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len,
592 &rt, msg->msg_flags);
593
594 else {
595 if (!ipc.addr)
596 ipc.addr = fl4.daddr;
597 lock_sock(sk);
598 err = ip_append_data(sk, &fl4, ip_generic_getfrag,
599 msg->msg_iov, len, 0,
600 &ipc, &rt, msg->msg_flags);
601 if (err)
602 ip_flush_pending_frames(sk);
603 else if (!(msg->msg_flags & MSG_MORE)) {
604 err = ip_push_pending_frames(sk, &fl4);
605 if (err == -ENOBUFS && !inet->recverr)
606 err = 0;
607 }
608 release_sock(sk);
609 }
610 done:
611 if (free)
612 kfree(ipc.opt);
613 ip_rt_put(rt);
614
615 out:
616 if (err < 0)
617 return err;
618 return len;
619
620 do_confirm:
621 dst_confirm(&rt->dst);
622 if (!(msg->msg_flags & MSG_PROBE) || len)
623 goto back_from_confirm;
624 err = 0;
625 goto done;
626 }
627
628 static void raw_close(struct sock *sk, long timeout)
629 {
630 /*
631 * Raw sockets may have direct kernel references. Kill them.
632 */
633 ip_ra_control(sk, 0, NULL);
634
635 sk_common_release(sk);
636 }
637
638 static void raw_destroy(struct sock *sk)
639 {
640 lock_sock(sk);
641 ip_flush_pending_frames(sk);
642 release_sock(sk);
643 }
644
645 /* This gets rid of all the nasties in af_inet. -DaveM */
646 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
647 {
648 struct inet_sock *inet = inet_sk(sk);
649 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
650 int ret = -EINVAL;
651 int chk_addr_ret;
652
653 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
654 goto out;
655 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
656 ret = -EADDRNOTAVAIL;
657 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
658 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
659 goto out;
660 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
661 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
662 inet->inet_saddr = 0; /* Use device */
663 sk_dst_reset(sk);
664 ret = 0;
665 out: return ret;
666 }
667
668 /*
669 * This should be easy, if there is something there
670 * we return it, otherwise we block.
671 */
672
673 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
674 size_t len, int noblock, int flags, int *addr_len)
675 {
676 struct inet_sock *inet = inet_sk(sk);
677 size_t copied = 0;
678 int err = -EOPNOTSUPP;
679 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
680 struct sk_buff *skb;
681
682 if (flags & MSG_OOB)
683 goto out;
684
685 if (addr_len)
686 *addr_len = sizeof(*sin);
687
688 if (flags & MSG_ERRQUEUE) {
689 err = ip_recv_error(sk, msg, len);
690 goto out;
691 }
692
693 skb = skb_recv_datagram(sk, flags, noblock, &err);
694 if (!skb)
695 goto out;
696
697 copied = skb->len;
698 if (len < copied) {
699 msg->msg_flags |= MSG_TRUNC;
700 copied = len;
701 }
702
703 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
704 if (err)
705 goto done;
706
707 sock_recv_ts_and_drops(msg, sk, skb);
708
709 /* Copy the address. */
710 if (sin) {
711 sin->sin_family = AF_INET;
712 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
713 sin->sin_port = 0;
714 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
715 }
716 if (inet->cmsg_flags)
717 ip_cmsg_recv(msg, skb);
718 if (flags & MSG_TRUNC)
719 copied = skb->len;
720 done:
721 skb_free_datagram(sk, skb);
722 out:
723 if (err)
724 return err;
725 return copied;
726 }
727
728 static int raw_init(struct sock *sk)
729 {
730 struct raw_sock *rp = raw_sk(sk);
731
732 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
733 memset(&rp->filter, 0, sizeof(rp->filter));
734 return 0;
735 }
736
737 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
738 {
739 if (optlen > sizeof(struct icmp_filter))
740 optlen = sizeof(struct icmp_filter);
741 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
742 return -EFAULT;
743 return 0;
744 }
745
746 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
747 {
748 int len, ret = -EFAULT;
749
750 if (get_user(len, optlen))
751 goto out;
752 ret = -EINVAL;
753 if (len < 0)
754 goto out;
755 if (len > sizeof(struct icmp_filter))
756 len = sizeof(struct icmp_filter);
757 ret = -EFAULT;
758 if (put_user(len, optlen) ||
759 copy_to_user(optval, &raw_sk(sk)->filter, len))
760 goto out;
761 ret = 0;
762 out: return ret;
763 }
764
765 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
766 char __user *optval, unsigned int optlen)
767 {
768 if (optname == ICMP_FILTER) {
769 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
770 return -EOPNOTSUPP;
771 else
772 return raw_seticmpfilter(sk, optval, optlen);
773 }
774 return -ENOPROTOOPT;
775 }
776
777 static int raw_setsockopt(struct sock *sk, int level, int optname,
778 char __user *optval, unsigned int optlen)
779 {
780 if (level != SOL_RAW)
781 return ip_setsockopt(sk, level, optname, optval, optlen);
782 return do_raw_setsockopt(sk, level, optname, optval, optlen);
783 }
784
785 #ifdef CONFIG_COMPAT
786 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
787 char __user *optval, unsigned int optlen)
788 {
789 if (level != SOL_RAW)
790 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
791 return do_raw_setsockopt(sk, level, optname, optval, optlen);
792 }
793 #endif
794
795 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
796 char __user *optval, int __user *optlen)
797 {
798 if (optname == ICMP_FILTER) {
799 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
800 return -EOPNOTSUPP;
801 else
802 return raw_geticmpfilter(sk, optval, optlen);
803 }
804 return -ENOPROTOOPT;
805 }
806
807 static int raw_getsockopt(struct sock *sk, int level, int optname,
808 char __user *optval, int __user *optlen)
809 {
810 if (level != SOL_RAW)
811 return ip_getsockopt(sk, level, optname, optval, optlen);
812 return do_raw_getsockopt(sk, level, optname, optval, optlen);
813 }
814
815 #ifdef CONFIG_COMPAT
816 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
817 char __user *optval, int __user *optlen)
818 {
819 if (level != SOL_RAW)
820 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
821 return do_raw_getsockopt(sk, level, optname, optval, optlen);
822 }
823 #endif
824
825 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
826 {
827 switch (cmd) {
828 case SIOCOUTQ: {
829 int amount = sk_wmem_alloc_get(sk);
830
831 return put_user(amount, (int __user *)arg);
832 }
833 case SIOCINQ: {
834 struct sk_buff *skb;
835 int amount = 0;
836
837 spin_lock_bh(&sk->sk_receive_queue.lock);
838 skb = skb_peek(&sk->sk_receive_queue);
839 if (skb != NULL)
840 amount = skb->len;
841 spin_unlock_bh(&sk->sk_receive_queue.lock);
842 return put_user(amount, (int __user *)arg);
843 }
844
845 default:
846 #ifdef CONFIG_IP_MROUTE
847 return ipmr_ioctl(sk, cmd, (void __user *)arg);
848 #else
849 return -ENOIOCTLCMD;
850 #endif
851 }
852 }
853
854 #ifdef CONFIG_COMPAT
855 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
856 {
857 switch (cmd) {
858 case SIOCOUTQ:
859 case SIOCINQ:
860 return -ENOIOCTLCMD;
861 default:
862 #ifdef CONFIG_IP_MROUTE
863 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
864 #else
865 return -ENOIOCTLCMD;
866 #endif
867 }
868 }
869 #endif
870
871 struct proto raw_prot = {
872 .name = "RAW",
873 .owner = THIS_MODULE,
874 .close = raw_close,
875 .destroy = raw_destroy,
876 .connect = ip4_datagram_connect,
877 .disconnect = udp_disconnect,
878 .ioctl = raw_ioctl,
879 .init = raw_init,
880 .setsockopt = raw_setsockopt,
881 .getsockopt = raw_getsockopt,
882 .sendmsg = raw_sendmsg,
883 .recvmsg = raw_recvmsg,
884 .bind = raw_bind,
885 .backlog_rcv = raw_rcv_skb,
886 .hash = raw_hash_sk,
887 .unhash = raw_unhash_sk,
888 .obj_size = sizeof(struct raw_sock),
889 .h.raw_hash = &raw_v4_hashinfo,
890 #ifdef CONFIG_COMPAT
891 .compat_setsockopt = compat_raw_setsockopt,
892 .compat_getsockopt = compat_raw_getsockopt,
893 .compat_ioctl = compat_raw_ioctl,
894 #endif
895 };
896
897 #ifdef CONFIG_PROC_FS
898 static struct sock *raw_get_first(struct seq_file *seq)
899 {
900 struct sock *sk;
901 struct raw_iter_state *state = raw_seq_private(seq);
902
903 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
904 ++state->bucket) {
905 struct hlist_node *node;
906
907 sk_for_each(sk, node, &state->h->ht[state->bucket])
908 if (sock_net(sk) == seq_file_net(seq))
909 goto found;
910 }
911 sk = NULL;
912 found:
913 return sk;
914 }
915
916 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
917 {
918 struct raw_iter_state *state = raw_seq_private(seq);
919
920 do {
921 sk = sk_next(sk);
922 try_again:
923 ;
924 } while (sk && sock_net(sk) != seq_file_net(seq));
925
926 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
927 sk = sk_head(&state->h->ht[state->bucket]);
928 goto try_again;
929 }
930 return sk;
931 }
932
933 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
934 {
935 struct sock *sk = raw_get_first(seq);
936
937 if (sk)
938 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
939 --pos;
940 return pos ? NULL : sk;
941 }
942
943 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
944 {
945 struct raw_iter_state *state = raw_seq_private(seq);
946
947 read_lock(&state->h->lock);
948 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
949 }
950 EXPORT_SYMBOL_GPL(raw_seq_start);
951
952 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
953 {
954 struct sock *sk;
955
956 if (v == SEQ_START_TOKEN)
957 sk = raw_get_first(seq);
958 else
959 sk = raw_get_next(seq, v);
960 ++*pos;
961 return sk;
962 }
963 EXPORT_SYMBOL_GPL(raw_seq_next);
964
965 void raw_seq_stop(struct seq_file *seq, void *v)
966 {
967 struct raw_iter_state *state = raw_seq_private(seq);
968
969 read_unlock(&state->h->lock);
970 }
971 EXPORT_SYMBOL_GPL(raw_seq_stop);
972
973 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
974 {
975 struct inet_sock *inet = inet_sk(sp);
976 __be32 dest = inet->inet_daddr,
977 src = inet->inet_rcv_saddr;
978 __u16 destp = 0,
979 srcp = inet->inet_num;
980
981 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
982 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
983 i, src, srcp, dest, destp, sp->sk_state,
984 sk_wmem_alloc_get(sp),
985 sk_rmem_alloc_get(sp),
986 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
987 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
988 }
989
990 static int raw_seq_show(struct seq_file *seq, void *v)
991 {
992 if (v == SEQ_START_TOKEN)
993 seq_printf(seq, " sl local_address rem_address st tx_queue "
994 "rx_queue tr tm->when retrnsmt uid timeout "
995 "inode ref pointer drops\n");
996 else
997 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
998 return 0;
999 }
1000
1001 static const struct seq_operations raw_seq_ops = {
1002 .start = raw_seq_start,
1003 .next = raw_seq_next,
1004 .stop = raw_seq_stop,
1005 .show = raw_seq_show,
1006 };
1007
1008 int raw_seq_open(struct inode *ino, struct file *file,
1009 struct raw_hashinfo *h, const struct seq_operations *ops)
1010 {
1011 int err;
1012 struct raw_iter_state *i;
1013
1014 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1015 if (err < 0)
1016 return err;
1017
1018 i = raw_seq_private((struct seq_file *)file->private_data);
1019 i->h = h;
1020 return 0;
1021 }
1022 EXPORT_SYMBOL_GPL(raw_seq_open);
1023
1024 static int raw_v4_seq_open(struct inode *inode, struct file *file)
1025 {
1026 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1027 }
1028
1029 static const struct file_operations raw_seq_fops = {
1030 .owner = THIS_MODULE,
1031 .open = raw_v4_seq_open,
1032 .read = seq_read,
1033 .llseek = seq_lseek,
1034 .release = seq_release_net,
1035 };
1036
1037 static __net_init int raw_init_net(struct net *net)
1038 {
1039 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
1040 return -ENOMEM;
1041
1042 return 0;
1043 }
1044
1045 static __net_exit void raw_exit_net(struct net *net)
1046 {
1047 proc_net_remove(net, "raw");
1048 }
1049
1050 static __net_initdata struct pernet_operations raw_net_ops = {
1051 .init = raw_init_net,
1052 .exit = raw_exit_net,
1053 };
1054
1055 int __init raw_proc_init(void)
1056 {
1057 return register_pernet_subsys(&raw_net_ops);
1058 }
1059
1060 void __init raw_proc_exit(void)
1061 {
1062 unregister_pernet_subsys(&raw_net_ops);
1063 }
1064 #endif /* CONFIG_PROC_FS */
linux-next