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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / net / ipv4 / raw.c
bloba3002fe65b7f4a345c1333c4d7f36392bee3b172
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 * Version: $Id: raw.c,v 1.64 2002/02/01 22:01:04 davem Exp $
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * Fixes:
14 * Alan Cox : verify_area() fixed up
15 * Alan Cox : ICMP error handling
16 * Alan Cox : EMSGSIZE if you send too big a packet
17 * Alan Cox : Now uses generic datagrams and shared
18 * skbuff library. No more peek crashes,
19 * no more backlogs
20 * Alan Cox : Checks sk->broadcast.
21 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram
22 * Alan Cox : Raw passes ip options too
23 * Alan Cox : Setsocketopt added
24 * Alan Cox : Fixed error return for broadcasts
25 * Alan Cox : Removed wake_up calls
26 * Alan Cox : Use ttl/tos
27 * Alan Cox : Cleaned up old debugging
28 * Alan Cox : Use new kernel side addresses
29 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets.
30 * Alan Cox : BSD style RAW socket demultiplexing.
31 * Alan Cox : Beginnings of mrouted support.
32 * Alan Cox : Added IP_HDRINCL option.
33 * Alan Cox : Skip broadcast check if BSDism set.
34 * David S. Miller : New socket lookup architecture.
35 *
36 * This program is free software; you can redistribute it and/or
37 * modify it under the terms of the GNU General Public License
38 * as published by the Free Software Foundation; either version
39 * 2 of the License, or (at your option) any later version.
40 */
41
42 #include <linux/types.h>
43 #include <asm/atomic.h>
44 #include <asm/byteorder.h>
45 #include <asm/current.h>
46 #include <asm/uaccess.h>
47 #include <asm/ioctls.h>
48 #include <linux/stddef.h>
49 #include <linux/slab.h>
50 #include <linux/errno.h>
51 #include <linux/aio.h>
52 #include <linux/kernel.h>
53 #include <linux/spinlock.h>
54 #include <linux/sockios.h>
55 #include <linux/socket.h>
56 #include <linux/in.h>
57 #include <linux/mroute.h>
58 #include <linux/netdevice.h>
59 #include <linux/in_route.h>
60 #include <linux/route.h>
61 #include <linux/skbuff.h>
62 #include <net/net_namespace.h>
63 #include <net/dst.h>
64 #include <net/sock.h>
65 #include <linux/gfp.h>
66 #include <linux/ip.h>
67 #include <linux/net.h>
68 #include <net/ip.h>
69 #include <net/icmp.h>
70 #include <net/udp.h>
71 #include <net/raw.h>
72 #include <net/snmp.h>
73 #include <net/tcp_states.h>
74 #include <net/inet_common.h>
75 #include <net/checksum.h>
76 #include <net/xfrm.h>
77 #include <linux/rtnetlink.h>
78 #include <linux/proc_fs.h>
79 #include <linux/seq_file.h>
80 #include <linux/netfilter.h>
81 #include <linux/netfilter_ipv4.h>
82
83 static struct raw_hashinfo raw_v4_hashinfo = {
84 .lock = __RW_LOCK_UNLOCKED(),
85 };
86
87 void raw_hash_sk(struct sock *sk, struct raw_hashinfo *h)
88 {
89 struct hlist_head *head;
90
91 head = &h->ht[inet_sk(sk)->num & (RAW_HTABLE_SIZE - 1)];
92
93 write_lock_bh(&h->lock);
94 sk_add_node(sk, head);
95 sock_prot_inuse_add(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, struct raw_hashinfo *h)
101 {
102 write_lock_bh(&h->lock);
103 if (sk_del_node_init(sk))
104 sock_prot_inuse_add(sk->sk_prot, -1);
105 write_unlock_bh(&h->lock);
106 }
107 EXPORT_SYMBOL_GPL(raw_unhash_sk);
108
109 static void raw_v4_hash(struct sock *sk)
110 {
111 raw_hash_sk(sk, &raw_v4_hashinfo);
112 }
113
114 static void raw_v4_unhash(struct sock *sk)
115 {
116 raw_unhash_sk(sk, &raw_v4_hashinfo);
117 }
118
119 static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
120 unsigned short num, __be32 raddr, __be32 laddr, int dif)
121 {
122 struct hlist_node *node;
123
124 sk_for_each_from(sk, node) {
125 struct inet_sock *inet = inet_sk(sk);
126
127 if (sk->sk_net == net && inet->num == num &&
128 !(inet->daddr && inet->daddr != raddr) &&
129 !(inet->rcv_saddr && inet->rcv_saddr != laddr) &&
130 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
131 goto found; /* gotcha */
132 }
133 sk = NULL;
134 found:
135 return sk;
136 }
137
138 /*
139 * 0 - deliver
140 * 1 - block
141 */
142 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
143 {
144 int type;
145
146 if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
147 return 1;
148
149 type = icmp_hdr(skb)->type;
150 if (type < 32) {
151 __u32 data = raw_sk(sk)->filter.data;
152
153 return ((1 << type) & data) != 0;
154 }
155
156 /* Do not block unknown ICMP types */
157 return 0;
158 }
159
160 /* IP input processing comes here for RAW socket delivery.
161 * Caller owns SKB, so we must make clones.
162 *
163 * RFC 1122: SHOULD pass TOS value up to the transport layer.
164 * -> It does. And not only TOS, but all IP header.
165 */
166 static int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
167 {
168 struct sock *sk;
169 struct hlist_head *head;
170 int delivered = 0;
171 struct net *net;
172
173 read_lock(&raw_v4_hashinfo.lock);
174 head = &raw_v4_hashinfo.ht[hash];
175 if (hlist_empty(head))
176 goto out;
177
178 net = skb->dev->nd_net;
179 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
180 iph->saddr, iph->daddr,
181 skb->dev->ifindex);
182
183 while (sk) {
184 delivered = 1;
185 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
186 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
187
188 /* Not releasing hash table! */
189 if (clone)
190 raw_rcv(sk, clone);
191 }
192 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
193 iph->saddr, iph->daddr,
194 skb->dev->ifindex);
195 }
196 out:
197 read_unlock(&raw_v4_hashinfo.lock);
198 return delivered;
199 }
200
201 int raw_local_deliver(struct sk_buff *skb, int protocol)
202 {
203 int hash;
204 struct sock *raw_sk;
205
206 hash = protocol & (RAW_HTABLE_SIZE - 1);
207 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
208
209 /* If there maybe a raw socket we must check - if not we
210 * don't care less
211 */
212 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
213 raw_sk = NULL;
214
215 return raw_sk != NULL;
216
217 }
218
219 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
220 {
221 struct inet_sock *inet = inet_sk(sk);
222 const int type = icmp_hdr(skb)->type;
223 const int code = icmp_hdr(skb)->code;
224 int err = 0;
225 int harderr = 0;
226
227 /* Report error on raw socket, if:
228 1. User requested ip_recverr.
229 2. Socket is connected (otherwise the error indication
230 is useless without ip_recverr and error is hard.
231 */
232 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
233 return;
234
235 switch (type) {
236 default:
237 case ICMP_TIME_EXCEEDED:
238 err = EHOSTUNREACH;
239 break;
240 case ICMP_SOURCE_QUENCH:
241 return;
242 case ICMP_PARAMETERPROB:
243 err = EPROTO;
244 harderr = 1;
245 break;
246 case ICMP_DEST_UNREACH:
247 err = EHOSTUNREACH;
248 if (code > NR_ICMP_UNREACH)
249 break;
250 err = icmp_err_convert[code].errno;
251 harderr = icmp_err_convert[code].fatal;
252 if (code == ICMP_FRAG_NEEDED) {
253 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
254 err = EMSGSIZE;
255 }
256 }
257
258 if (inet->recverr) {
259 struct iphdr *iph = (struct iphdr*)skb->data;
260 u8 *payload = skb->data + (iph->ihl << 2);
261
262 if (inet->hdrincl)
263 payload = skb->data;
264 ip_icmp_error(sk, skb, err, 0, info, payload);
265 }
266
267 if (inet->recverr || harderr) {
268 sk->sk_err = err;
269 sk->sk_error_report(sk);
270 }
271 }
272
273 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
274 {
275 int hash;
276 struct sock *raw_sk;
277 struct iphdr *iph;
278 struct net *net;
279
280 hash = protocol & (RAW_HTABLE_SIZE - 1);
281
282 read_lock(&raw_v4_hashinfo.lock);
283 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
284 if (raw_sk != NULL) {
285 iph = (struct iphdr *)skb->data;
286 net = skb->dev->nd_net;
287
288 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
289 iph->daddr, iph->saddr,
290 skb->dev->ifindex)) != NULL) {
291 raw_err(raw_sk, skb, info);
292 raw_sk = sk_next(raw_sk);
293 iph = (struct iphdr *)skb->data;
294 }
295 }
296 read_unlock(&raw_v4_hashinfo.lock);
297 }
298
299 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
300 {
301 /* Charge it to the socket. */
302
303 if (sock_queue_rcv_skb(sk, skb) < 0) {
304 atomic_inc(&sk->sk_drops);
305 kfree_skb(skb);
306 return NET_RX_DROP;
307 }
308
309 return NET_RX_SUCCESS;
310 }
311
312 int raw_rcv(struct sock *sk, struct sk_buff *skb)
313 {
314 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
315 atomic_inc(&sk->sk_drops);
316 kfree_skb(skb);
317 return NET_RX_DROP;
318 }
319 nf_reset(skb);
320
321 skb_push(skb, skb->data - skb_network_header(skb));
322
323 raw_rcv_skb(sk, skb);
324 return 0;
325 }
326
327 static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
328 struct rtable *rt,
329 unsigned int flags)
330 {
331 struct inet_sock *inet = inet_sk(sk);
332 int hh_len;
333 struct iphdr *iph;
334 struct sk_buff *skb;
335 unsigned int iphlen;
336 int err;
337
338 if (length > rt->u.dst.dev->mtu) {
339 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport,
340 rt->u.dst.dev->mtu);
341 return -EMSGSIZE;
342 }
343 if (flags&MSG_PROBE)
344 goto out;
345
346 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
347
348 skb = sock_alloc_send_skb(sk, length+hh_len+15,
349 flags&MSG_DONTWAIT, &err);
350 if (skb == NULL)
351 goto error;
352 skb_reserve(skb, hh_len);
353
354 skb->priority = sk->sk_priority;
355 skb->mark = sk->sk_mark;
356 skb->dst = dst_clone(&rt->u.dst);
357
358 skb_reset_network_header(skb);
359 iph = ip_hdr(skb);
360 skb_put(skb, length);
361
362 skb->ip_summed = CHECKSUM_NONE;
363
364 skb->transport_header = skb->network_header;
365 err = memcpy_fromiovecend((void *)iph, from, 0, length);
366 if (err)
367 goto error_fault;
368
369 /* We don't modify invalid header */
370 iphlen = iph->ihl * 4;
371 if (iphlen >= sizeof(*iph) && iphlen <= length) {
372 if (!iph->saddr)
373 iph->saddr = rt->rt_src;
374 iph->check = 0;
375 iph->tot_len = htons(length);
376 if (!iph->id)
377 ip_select_ident(iph, &rt->u.dst, NULL);
378
379 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
380 }
381 if (iph->protocol == IPPROTO_ICMP)
382 icmp_out_count(((struct icmphdr *)
383 skb_transport_header(skb))->type);
384
385 err = NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
386 dst_output);
387 if (err > 0)
388 err = inet->recverr ? net_xmit_errno(err) : 0;
389 if (err)
390 goto error;
391 out:
392 return 0;
393
394 error_fault:
395 err = -EFAULT;
396 kfree_skb(skb);
397 error:
398 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
399 return err;
400 }
401
402 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
403 {
404 struct iovec *iov;
405 u8 __user *type = NULL;
406 u8 __user *code = NULL;
407 int probed = 0;
408 unsigned int i;
409
410 if (!msg->msg_iov)
411 return 0;
412
413 for (i = 0; i < msg->msg_iovlen; i++) {
414 iov = &msg->msg_iov[i];
415 if (!iov)
416 continue;
417
418 switch (fl->proto) {
419 case IPPROTO_ICMP:
420 /* check if one-byte field is readable or not. */
421 if (iov->iov_base && iov->iov_len < 1)
422 break;
423
424 if (!type) {
425 type = iov->iov_base;
426 /* check if code field is readable or not. */
427 if (iov->iov_len > 1)
428 code = type + 1;
429 } else if (!code)
430 code = iov->iov_base;
431
432 if (type && code) {
433 if (get_user(fl->fl_icmp_type, type) ||
434 get_user(fl->fl_icmp_code, code))
435 return -EFAULT;
436 probed = 1;
437 }
438 break;
439 default:
440 probed = 1;
441 break;
442 }
443 if (probed)
444 break;
445 }
446 return 0;
447 }
448
449 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
450 size_t len)
451 {
452 struct inet_sock *inet = inet_sk(sk);
453 struct ipcm_cookie ipc;
454 struct rtable *rt = NULL;
455 int free = 0;
456 __be32 daddr;
457 __be32 saddr;
458 u8 tos;
459 int err;
460
461 err = -EMSGSIZE;
462 if (len > 0xFFFF)
463 goto out;
464
465 /*
466 * Check the flags.
467 */
468
469 err = -EOPNOTSUPP;
470 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
471 goto out; /* compatibility */
472
473 /*
474 * Get and verify the address.
475 */
476
477 if (msg->msg_namelen) {
478 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
479 err = -EINVAL;
480 if (msg->msg_namelen < sizeof(*usin))
481 goto out;
482 if (usin->sin_family != AF_INET) {
483 static int complained;
484 if (!complained++)
485 printk(KERN_INFO "%s forgot to set AF_INET in "
486 "raw sendmsg. Fix it!\n",
487 current->comm);
488 err = -EAFNOSUPPORT;
489 if (usin->sin_family)
490 goto out;
491 }
492 daddr = usin->sin_addr.s_addr;
493 /* ANK: I did not forget to get protocol from port field.
494 * I just do not know, who uses this weirdness.
495 * IP_HDRINCL is much more convenient.
496 */
497 } else {
498 err = -EDESTADDRREQ;
499 if (sk->sk_state != TCP_ESTABLISHED)
500 goto out;
501 daddr = inet->daddr;
502 }
503
504 ipc.addr = inet->saddr;
505 ipc.opt = NULL;
506 ipc.oif = sk->sk_bound_dev_if;
507
508 if (msg->msg_controllen) {
509 err = ip_cmsg_send(msg, &ipc);
510 if (err)
511 goto out;
512 if (ipc.opt)
513 free = 1;
514 }
515
516 saddr = ipc.addr;
517 ipc.addr = daddr;
518
519 if (!ipc.opt)
520 ipc.opt = inet->opt;
521
522 if (ipc.opt) {
523 err = -EINVAL;
524 /* Linux does not mangle headers on raw sockets,
525 * so that IP options + IP_HDRINCL is non-sense.
526 */
527 if (inet->hdrincl)
528 goto done;
529 if (ipc.opt->srr) {
530 if (!daddr)
531 goto done;
532 daddr = ipc.opt->faddr;
533 }
534 }
535 tos = RT_CONN_FLAGS(sk);
536 if (msg->msg_flags & MSG_DONTROUTE)
537 tos |= RTO_ONLINK;
538
539 if (ipv4_is_multicast(daddr)) {
540 if (!ipc.oif)
541 ipc.oif = inet->mc_index;
542 if (!saddr)
543 saddr = inet->mc_addr;
544 }
545
546 {
547 struct flowi fl = { .oif = ipc.oif,
548 .mark = sk->sk_mark,
549 .nl_u = { .ip4_u =
550 { .daddr = daddr,
551 .saddr = saddr,
552 .tos = tos } },
553 .proto = inet->hdrincl ? IPPROTO_RAW :
554 sk->sk_protocol,
555 };
556 if (!inet->hdrincl) {
557 err = raw_probe_proto_opt(&fl, msg);
558 if (err)
559 goto done;
560 }
561
562 security_sk_classify_flow(sk, &fl);
563 err = ip_route_output_flow(&init_net, &rt, &fl, sk, 1);
564 }
565 if (err)
566 goto done;
567
568 err = -EACCES;
569 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
570 goto done;
571
572 if (msg->msg_flags & MSG_CONFIRM)
573 goto do_confirm;
574 back_from_confirm:
575
576 if (inet->hdrincl)
577 err = raw_send_hdrinc(sk, msg->msg_iov, len,
578 rt, msg->msg_flags);
579
580 else {
581 if (!ipc.addr)
582 ipc.addr = rt->rt_dst;
583 lock_sock(sk);
584 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
585 &ipc, rt, msg->msg_flags);
586 if (err)
587 ip_flush_pending_frames(sk);
588 else if (!(msg->msg_flags & MSG_MORE))
589 err = ip_push_pending_frames(sk);
590 release_sock(sk);
591 }
592 done:
593 if (free)
594 kfree(ipc.opt);
595 ip_rt_put(rt);
596
597 out:
598 if (err < 0)
599 return err;
600 return len;
601
602 do_confirm:
603 dst_confirm(&rt->u.dst);
604 if (!(msg->msg_flags & MSG_PROBE) || len)
605 goto back_from_confirm;
606 err = 0;
607 goto done;
608 }
609
610 static void raw_close(struct sock *sk, long timeout)
611 {
612 /*
613 * Raw sockets may have direct kernel refereneces. Kill them.
614 */
615 ip_ra_control(sk, 0, NULL);
616
617 sk_common_release(sk);
618 }
619
620 /* This gets rid of all the nasties in af_inet. -DaveM */
621 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
622 {
623 struct inet_sock *inet = inet_sk(sk);
624 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
625 int ret = -EINVAL;
626 int chk_addr_ret;
627
628 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
629 goto out;
630 chk_addr_ret = inet_addr_type(sk->sk_net, addr->sin_addr.s_addr);
631 ret = -EADDRNOTAVAIL;
632 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
633 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
634 goto out;
635 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
636 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
637 inet->saddr = 0; /* Use device */
638 sk_dst_reset(sk);
639 ret = 0;
640 out: return ret;
641 }
642
643 /*
644 * This should be easy, if there is something there
645 * we return it, otherwise we block.
646 */
647
648 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
649 size_t len, int noblock, int flags, int *addr_len)
650 {
651 struct inet_sock *inet = inet_sk(sk);
652 size_t copied = 0;
653 int err = -EOPNOTSUPP;
654 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
655 struct sk_buff *skb;
656
657 if (flags & MSG_OOB)
658 goto out;
659
660 if (addr_len)
661 *addr_len = sizeof(*sin);
662
663 if (flags & MSG_ERRQUEUE) {
664 err = ip_recv_error(sk, msg, len);
665 goto out;
666 }
667
668 skb = skb_recv_datagram(sk, flags, noblock, &err);
669 if (!skb)
670 goto out;
671
672 copied = skb->len;
673 if (len < copied) {
674 msg->msg_flags |= MSG_TRUNC;
675 copied = len;
676 }
677
678 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
679 if (err)
680 goto done;
681
682 sock_recv_timestamp(msg, sk, skb);
683
684 /* Copy the address. */
685 if (sin) {
686 sin->sin_family = AF_INET;
687 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
688 sin->sin_port = 0;
689 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
690 }
691 if (inet->cmsg_flags)
692 ip_cmsg_recv(msg, skb);
693 if (flags & MSG_TRUNC)
694 copied = skb->len;
695 done:
696 skb_free_datagram(sk, skb);
697 out:
698 if (err)
699 return err;
700 return copied;
701 }
702
703 static int raw_init(struct sock *sk)
704 {
705 struct raw_sock *rp = raw_sk(sk);
706
707 if (inet_sk(sk)->num == IPPROTO_ICMP)
708 memset(&rp->filter, 0, sizeof(rp->filter));
709 return 0;
710 }
711
712 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
713 {
714 if (optlen > sizeof(struct icmp_filter))
715 optlen = sizeof(struct icmp_filter);
716 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
717 return -EFAULT;
718 return 0;
719 }
720
721 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
722 {
723 int len, ret = -EFAULT;
724
725 if (get_user(len, optlen))
726 goto out;
727 ret = -EINVAL;
728 if (len < 0)
729 goto out;
730 if (len > sizeof(struct icmp_filter))
731 len = sizeof(struct icmp_filter);
732 ret = -EFAULT;
733 if (put_user(len, optlen) ||
734 copy_to_user(optval, &raw_sk(sk)->filter, len))
735 goto out;
736 ret = 0;
737 out: return ret;
738 }
739
740 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
741 char __user *optval, int optlen)
742 {
743 if (optname == ICMP_FILTER) {
744 if (inet_sk(sk)->num != IPPROTO_ICMP)
745 return -EOPNOTSUPP;
746 else
747 return raw_seticmpfilter(sk, optval, optlen);
748 }
749 return -ENOPROTOOPT;
750 }
751
752 static int raw_setsockopt(struct sock *sk, int level, int optname,
753 char __user *optval, int optlen)
754 {
755 if (level != SOL_RAW)
756 return ip_setsockopt(sk, level, optname, optval, optlen);
757 return do_raw_setsockopt(sk, level, optname, optval, optlen);
758 }
759
760 #ifdef CONFIG_COMPAT
761 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
762 char __user *optval, int optlen)
763 {
764 if (level != SOL_RAW)
765 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
766 return do_raw_setsockopt(sk, level, optname, optval, optlen);
767 }
768 #endif
769
770 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
771 char __user *optval, int __user *optlen)
772 {
773 if (optname == ICMP_FILTER) {
774 if (inet_sk(sk)->num != IPPROTO_ICMP)
775 return -EOPNOTSUPP;
776 else
777 return raw_geticmpfilter(sk, optval, optlen);
778 }
779 return -ENOPROTOOPT;
780 }
781
782 static int raw_getsockopt(struct sock *sk, int level, int optname,
783 char __user *optval, int __user *optlen)
784 {
785 if (level != SOL_RAW)
786 return ip_getsockopt(sk, level, optname, optval, optlen);
787 return do_raw_getsockopt(sk, level, optname, optval, optlen);
788 }
789
790 #ifdef CONFIG_COMPAT
791 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
792 char __user *optval, int __user *optlen)
793 {
794 if (level != SOL_RAW)
795 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
796 return do_raw_getsockopt(sk, level, optname, optval, optlen);
797 }
798 #endif
799
800 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
801 {
802 switch (cmd) {
803 case SIOCOUTQ: {
804 int amount = atomic_read(&sk->sk_wmem_alloc);
805 return put_user(amount, (int __user *)arg);
806 }
807 case SIOCINQ: {
808 struct sk_buff *skb;
809 int amount = 0;
810
811 spin_lock_bh(&sk->sk_receive_queue.lock);
812 skb = skb_peek(&sk->sk_receive_queue);
813 if (skb != NULL)
814 amount = skb->len;
815 spin_unlock_bh(&sk->sk_receive_queue.lock);
816 return put_user(amount, (int __user *)arg);
817 }
818
819 default:
820 #ifdef CONFIG_IP_MROUTE
821 return ipmr_ioctl(sk, cmd, (void __user *)arg);
822 #else
823 return -ENOIOCTLCMD;
824 #endif
825 }
826 }
827
828 DEFINE_PROTO_INUSE(raw)
829
830 struct proto raw_prot = {
831 .name = "RAW",
832 .owner = THIS_MODULE,
833 .close = raw_close,
834 .connect = ip4_datagram_connect,
835 .disconnect = udp_disconnect,
836 .ioctl = raw_ioctl,
837 .init = raw_init,
838 .setsockopt = raw_setsockopt,
839 .getsockopt = raw_getsockopt,
840 .sendmsg = raw_sendmsg,
841 .recvmsg = raw_recvmsg,
842 .bind = raw_bind,
843 .backlog_rcv = raw_rcv_skb,
844 .hash = raw_v4_hash,
845 .unhash = raw_v4_unhash,
846 .obj_size = sizeof(struct raw_sock),
847 #ifdef CONFIG_COMPAT
848 .compat_setsockopt = compat_raw_setsockopt,
849 .compat_getsockopt = compat_raw_getsockopt,
850 #endif
851 REF_PROTO_INUSE(raw)
852 };
853
854 #ifdef CONFIG_PROC_FS
855 static struct sock *raw_get_first(struct seq_file *seq)
856 {
857 struct sock *sk;
858 struct raw_iter_state* state = raw_seq_private(seq);
859
860 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
861 ++state->bucket) {
862 struct hlist_node *node;
863
864 sk_for_each(sk, node, &state->h->ht[state->bucket])
865 if (sk->sk_net == state->p.net)
866 goto found;
867 }
868 sk = NULL;
869 found:
870 return sk;
871 }
872
873 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
874 {
875 struct raw_iter_state* state = raw_seq_private(seq);
876
877 do {
878 sk = sk_next(sk);
879 try_again:
880 ;
881 } while (sk && sk->sk_net != state->p.net);
882
883 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
884 sk = sk_head(&state->h->ht[state->bucket]);
885 goto try_again;
886 }
887 return sk;
888 }
889
890 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
891 {
892 struct sock *sk = raw_get_first(seq);
893
894 if (sk)
895 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
896 --pos;
897 return pos ? NULL : sk;
898 }
899
900 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
901 {
902 struct raw_iter_state *state = raw_seq_private(seq);
903
904 read_lock(&state->h->lock);
905 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
906 }
907 EXPORT_SYMBOL_GPL(raw_seq_start);
908
909 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
910 {
911 struct sock *sk;
912
913 if (v == SEQ_START_TOKEN)
914 sk = raw_get_first(seq);
915 else
916 sk = raw_get_next(seq, v);
917 ++*pos;
918 return sk;
919 }
920 EXPORT_SYMBOL_GPL(raw_seq_next);
921
922 void raw_seq_stop(struct seq_file *seq, void *v)
923 {
924 struct raw_iter_state *state = raw_seq_private(seq);
925
926 read_unlock(&state->h->lock);
927 }
928 EXPORT_SYMBOL_GPL(raw_seq_stop);
929
930 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
931 {
932 struct inet_sock *inet = inet_sk(sp);
933 __be32 dest = inet->daddr,
934 src = inet->rcv_saddr;
935 __u16 destp = 0,
936 srcp = inet->num;
937
938 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
939 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d",
940 i, src, srcp, dest, destp, sp->sk_state,
941 atomic_read(&sp->sk_wmem_alloc),
942 atomic_read(&sp->sk_rmem_alloc),
943 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
944 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
945 }
946
947 static int raw_seq_show(struct seq_file *seq, void *v)
948 {
949 if (v == SEQ_START_TOKEN)
950 seq_printf(seq, " sl local_address rem_address st tx_queue "
951 "rx_queue tr tm->when retrnsmt uid timeout "
952 "inode drops\n");
953 else
954 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
955 return 0;
956 }
957
958 static const struct seq_operations raw_seq_ops = {
959 .start = raw_seq_start,
960 .next = raw_seq_next,
961 .stop = raw_seq_stop,
962 .show = raw_seq_show,
963 };
964
965 int raw_seq_open(struct inode *ino, struct file *file,
966 struct raw_hashinfo *h, const struct seq_operations *ops)
967 {
968 int err;
969 struct raw_iter_state *i;
970
971 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
972 if (err < 0)
973 return err;
974
975 i = raw_seq_private((struct seq_file *)file->private_data);
976 i->h = h;
977 return 0;
978 }
979 EXPORT_SYMBOL_GPL(raw_seq_open);
980
981 static int raw_v4_seq_open(struct inode *inode, struct file *file)
982 {
983 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
984 }
985
986 static const struct file_operations raw_seq_fops = {
987 .owner = THIS_MODULE,
988 .open = raw_v4_seq_open,
989 .read = seq_read,
990 .llseek = seq_lseek,
991 .release = seq_release_net,
992 };
993
994 static __net_init int raw_init_net(struct net *net)
995 {
996 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
997 return -ENOMEM;
998
999 return 0;
1000 }
1001
1002 static __net_exit void raw_exit_net(struct net *net)
1003 {
1004 proc_net_remove(net, "raw");
1005 }
1006
1007 static __net_initdata struct pernet_operations raw_net_ops = {
1008 .init = raw_init_net,
1009 .exit = raw_exit_net,
1010 };
1011
1012 int __init raw_proc_init(void)
1013 {
1014 return register_pernet_subsys(&raw_net_ops);
1015 }
1016
1017 void __init raw_proc_exit(void)
1018 {
1019 unregister_pernet_subsys(&raw_net_ops);
1020 }
1021 #endif /* CONFIG_PROC_FS */
WRT350N Kernel Patches