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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[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 <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 struct hlist_node *node;
115
116 sk_for_each_from(sk, node) {
117 struct inet_sock *inet = inet_sk(sk);
118
119 if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
120 !(inet->inet_daddr && inet->inet_daddr != raddr) &&
121 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
122 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
123 goto found; /* gotcha */
124 }
125 sk = NULL;
126 found:
127 return sk;
128 }
129
130 /*
131 * 0 - deliver
132 * 1 - block
133 */
134 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
135 {
136 int type;
137
138 if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
139 return 1;
140
141 type = icmp_hdr(skb)->type;
142 if (type < 32) {
143 __u32 data = raw_sk(sk)->filter.data;
144
145 return ((1 << 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 /* Report error on raw socket, if:
220 1. User requested ip_recverr.
221 2. Socket is connected (otherwise the error indication
222 is useless without ip_recverr and error is hard.
223 */
224 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
225 return;
226
227 switch (type) {
228 default:
229 case ICMP_TIME_EXCEEDED:
230 err = EHOSTUNREACH;
231 break;
232 case ICMP_SOURCE_QUENCH:
233 return;
234 case ICMP_PARAMETERPROB:
235 err = EPROTO;
236 harderr = 1;
237 break;
238 case ICMP_DEST_UNREACH:
239 err = EHOSTUNREACH;
240 if (code > NR_ICMP_UNREACH)
241 break;
242 err = icmp_err_convert[code].errno;
243 harderr = icmp_err_convert[code].fatal;
244 if (code == ICMP_FRAG_NEEDED) {
245 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
246 err = EMSGSIZE;
247 }
248 }
249
250 if (inet->recverr) {
251 const struct iphdr *iph = (const struct iphdr *)skb->data;
252 u8 *payload = skb->data + (iph->ihl << 2);
253
254 if (inet->hdrincl)
255 payload = skb->data;
256 ip_icmp_error(sk, skb, err, 0, info, payload);
257 }
258
259 if (inet->recverr || harderr) {
260 sk->sk_err = err;
261 sk->sk_error_report(sk);
262 }
263 }
264
265 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
266 {
267 int hash;
268 struct sock *raw_sk;
269 const struct iphdr *iph;
270 struct net *net;
271
272 hash = protocol & (RAW_HTABLE_SIZE - 1);
273
274 read_lock(&raw_v4_hashinfo.lock);
275 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
276 if (raw_sk != NULL) {
277 iph = (const struct iphdr *)skb->data;
278 net = dev_net(skb->dev);
279
280 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
281 iph->daddr, iph->saddr,
282 skb->dev->ifindex)) != NULL) {
283 raw_err(raw_sk, skb, info);
284 raw_sk = sk_next(raw_sk);
285 iph = (const struct iphdr *)skb->data;
286 }
287 }
288 read_unlock(&raw_v4_hashinfo.lock);
289 }
290
291 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
292 {
293 /* Charge it to the socket. */
294
295 ipv4_pktinfo_prepare(skb);
296 if (sock_queue_rcv_skb(sk, skb) < 0) {
297 kfree_skb(skb);
298 return NET_RX_DROP;
299 }
300
301 return NET_RX_SUCCESS;
302 }
303
304 int raw_rcv(struct sock *sk, struct sk_buff *skb)
305 {
306 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
307 atomic_inc(&sk->sk_drops);
308 kfree_skb(skb);
309 return NET_RX_DROP;
310 }
311 nf_reset(skb);
312
313 skb_push(skb, skb->data - skb_network_header(skb));
314
315 raw_rcv_skb(sk, skb);
316 return 0;
317 }
318
319 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
320 void *from, size_t length,
321 struct rtable **rtp,
322 unsigned int flags)
323 {
324 struct inet_sock *inet = inet_sk(sk);
325 struct net *net = sock_net(sk);
326 struct iphdr *iph;
327 struct sk_buff *skb;
328 unsigned int iphlen;
329 int err;
330 struct rtable *rt = *rtp;
331 int hlen, tlen;
332
333 if (length > rt->dst.dev->mtu) {
334 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
335 rt->dst.dev->mtu);
336 return -EMSGSIZE;
337 }
338 if (flags&MSG_PROBE)
339 goto out;
340
341 hlen = LL_RESERVED_SPACE(rt->dst.dev);
342 tlen = rt->dst.dev->needed_tailroom;
343 skb = sock_alloc_send_skb(sk,
344 length + hlen + tlen + 15,
345 flags & MSG_DONTWAIT, &err);
346 if (skb == NULL)
347 goto error;
348 skb_reserve(skb, hlen);
349
350 skb->priority = sk->sk_priority;
351 skb->mark = sk->sk_mark;
352 skb_dst_set(skb, &rt->dst);
353 *rtp = NULL;
354
355 skb_reset_network_header(skb);
356 iph = ip_hdr(skb);
357 skb_put(skb, length);
358
359 skb->ip_summed = CHECKSUM_NONE;
360
361 skb->transport_header = skb->network_header;
362 err = -EFAULT;
363 if (memcpy_fromiovecend((void *)iph, from, 0, length))
364 goto error_free;
365
366 iphlen = iph->ihl * 4;
367
368 /*
369 * We don't want to modify the ip header, but we do need to
370 * be sure that it won't cause problems later along the network
371 * stack. Specifically we want to make sure that iph->ihl is a
372 * sane value. If ihl points beyond the length of the buffer passed
373 * in, reject the frame as invalid
374 */
375 err = -EINVAL;
376 if (iphlen > length)
377 goto error_free;
378
379 if (iphlen >= sizeof(*iph)) {
380 if (!iph->saddr)
381 iph->saddr = fl4->saddr;
382 iph->check = 0;
383 iph->tot_len = htons(length);
384 if (!iph->id)
385 ip_select_ident(iph, &rt->dst, NULL);
386
387 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
388 }
389 if (iph->protocol == IPPROTO_ICMP)
390 icmp_out_count(net, ((struct icmphdr *)
391 skb_transport_header(skb))->type);
392
393 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL,
394 rt->dst.dev, dst_output);
395 if (err > 0)
396 err = net_xmit_errno(err);
397 if (err)
398 goto error;
399 out:
400 return 0;
401
402 error_free:
403 kfree_skb(skb);
404 error:
405 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
406 if (err == -ENOBUFS && !inet->recverr)
407 err = 0;
408 return err;
409 }
410
411 static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg)
412 {
413 struct iovec *iov;
414 u8 __user *type = NULL;
415 u8 __user *code = NULL;
416 int probed = 0;
417 unsigned int i;
418
419 if (!msg->msg_iov)
420 return 0;
421
422 for (i = 0; i < msg->msg_iovlen; i++) {
423 iov = &msg->msg_iov[i];
424 if (!iov)
425 continue;
426
427 switch (fl4->flowi4_proto) {
428 case IPPROTO_ICMP:
429 /* check if one-byte field is readable or not. */
430 if (iov->iov_base && iov->iov_len < 1)
431 break;
432
433 if (!type) {
434 type = iov->iov_base;
435 /* check if code field is readable or not. */
436 if (iov->iov_len > 1)
437 code = type + 1;
438 } else if (!code)
439 code = iov->iov_base;
440
441 if (type && code) {
442 if (get_user(fl4->fl4_icmp_type, type) ||
443 get_user(fl4->fl4_icmp_code, code))
444 return -EFAULT;
445 probed = 1;
446 }
447 break;
448 default:
449 probed = 1;
450 break;
451 }
452 if (probed)
453 break;
454 }
455 return 0;
456 }
457
458 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
459 size_t len)
460 {
461 struct inet_sock *inet = inet_sk(sk);
462 struct ipcm_cookie ipc;
463 struct rtable *rt = NULL;
464 struct flowi4 fl4;
465 int free = 0;
466 __be32 daddr;
467 __be32 saddr;
468 u8 tos;
469 int err;
470 struct ip_options_data opt_copy;
471
472 err = -EMSGSIZE;
473 if (len > 0xFFFF)
474 goto out;
475
476 /*
477 * Check the flags.
478 */
479
480 err = -EOPNOTSUPP;
481 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
482 goto out; /* compatibility */
483
484 /*
485 * Get and verify the address.
486 */
487
488 if (msg->msg_namelen) {
489 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
490 err = -EINVAL;
491 if (msg->msg_namelen < sizeof(*usin))
492 goto out;
493 if (usin->sin_family != AF_INET) {
494 static int complained;
495 if (!complained++)
496 printk(KERN_INFO "%s forgot to set AF_INET in "
497 "raw sendmsg. Fix it!\n",
498 current->comm);
499 err = -EAFNOSUPPORT;
500 if (usin->sin_family)
501 goto out;
502 }
503 daddr = usin->sin_addr.s_addr;
504 /* ANK: I did not forget to get protocol from port field.
505 * I just do not know, who uses this weirdness.
506 * IP_HDRINCL is much more convenient.
507 */
508 } else {
509 err = -EDESTADDRREQ;
510 if (sk->sk_state != TCP_ESTABLISHED)
511 goto out;
512 daddr = inet->inet_daddr;
513 }
514
515 ipc.addr = inet->inet_saddr;
516 ipc.opt = NULL;
517 ipc.tx_flags = 0;
518 ipc.oif = sk->sk_bound_dev_if;
519
520 if (msg->msg_controllen) {
521 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
522 if (err)
523 goto out;
524 if (ipc.opt)
525 free = 1;
526 }
527
528 saddr = ipc.addr;
529 ipc.addr = daddr;
530
531 if (!ipc.opt) {
532 struct ip_options_rcu *inet_opt;
533
534 rcu_read_lock();
535 inet_opt = rcu_dereference(inet->inet_opt);
536 if (inet_opt) {
537 memcpy(&opt_copy, inet_opt,
538 sizeof(*inet_opt) + inet_opt->opt.optlen);
539 ipc.opt = &opt_copy.opt;
540 }
541 rcu_read_unlock();
542 }
543
544 if (ipc.opt) {
545 err = -EINVAL;
546 /* Linux does not mangle headers on raw sockets,
547 * so that IP options + IP_HDRINCL is non-sense.
548 */
549 if (inet->hdrincl)
550 goto done;
551 if (ipc.opt->opt.srr) {
552 if (!daddr)
553 goto done;
554 daddr = ipc.opt->opt.faddr;
555 }
556 }
557 tos = RT_CONN_FLAGS(sk);
558 if (msg->msg_flags & MSG_DONTROUTE)
559 tos |= RTO_ONLINK;
560
561 if (ipv4_is_multicast(daddr)) {
562 if (!ipc.oif)
563 ipc.oif = inet->mc_index;
564 if (!saddr)
565 saddr = inet->mc_addr;
566 }
567
568 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
569 RT_SCOPE_UNIVERSE,
570 inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
571 inet_sk_flowi_flags(sk) | FLOWI_FLAG_CAN_SLEEP,
572 daddr, saddr, 0, 0);
573
574 if (!inet->hdrincl) {
575 err = raw_probe_proto_opt(&fl4, msg);
576 if (err)
577 goto done;
578 }
579
580 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
581 rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
582 if (IS_ERR(rt)) {
583 err = PTR_ERR(rt);
584 rt = NULL;
585 goto done;
586 }
587
588 err = -EACCES;
589 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
590 goto done;
591
592 if (msg->msg_flags & MSG_CONFIRM)
593 goto do_confirm;
594 back_from_confirm:
595
596 if (inet->hdrincl)
597 err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len,
598 &rt, msg->msg_flags);
599
600 else {
601 if (!ipc.addr)
602 ipc.addr = fl4.daddr;
603 lock_sock(sk);
604 err = ip_append_data(sk, &fl4, ip_generic_getfrag,
605 msg->msg_iov, len, 0,
606 &ipc, &rt, msg->msg_flags);
607 if (err)
608 ip_flush_pending_frames(sk);
609 else if (!(msg->msg_flags & MSG_MORE)) {
610 err = ip_push_pending_frames(sk, &fl4);
611 if (err == -ENOBUFS && !inet->recverr)
612 err = 0;
613 }
614 release_sock(sk);
615 }
616 done:
617 if (free)
618 kfree(ipc.opt);
619 ip_rt_put(rt);
620
621 out:
622 if (err < 0)
623 return err;
624 return len;
625
626 do_confirm:
627 dst_confirm(&rt->dst);
628 if (!(msg->msg_flags & MSG_PROBE) || len)
629 goto back_from_confirm;
630 err = 0;
631 goto done;
632 }
633
634 static void raw_close(struct sock *sk, long timeout)
635 {
636 /*
637 * Raw sockets may have direct kernel references. Kill them.
638 */
639 ip_ra_control(sk, 0, NULL);
640
641 sk_common_release(sk);
642 }
643
644 static void raw_destroy(struct sock *sk)
645 {
646 lock_sock(sk);
647 ip_flush_pending_frames(sk);
648 release_sock(sk);
649 }
650
651 /* This gets rid of all the nasties in af_inet. -DaveM */
652 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
653 {
654 struct inet_sock *inet = inet_sk(sk);
655 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
656 int ret = -EINVAL;
657 int chk_addr_ret;
658
659 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
660 goto out;
661 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
662 ret = -EADDRNOTAVAIL;
663 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
664 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
665 goto out;
666 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
667 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
668 inet->inet_saddr = 0; /* Use device */
669 sk_dst_reset(sk);
670 ret = 0;
671 out: return ret;
672 }
673
674 /*
675 * This should be easy, if there is something there
676 * we return it, otherwise we block.
677 */
678
679 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
680 size_t len, int noblock, int flags, int *addr_len)
681 {
682 struct inet_sock *inet = inet_sk(sk);
683 size_t copied = 0;
684 int err = -EOPNOTSUPP;
685 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
686 struct sk_buff *skb;
687
688 if (flags & MSG_OOB)
689 goto out;
690
691 if (addr_len)
692 *addr_len = sizeof(*sin);
693
694 if (flags & MSG_ERRQUEUE) {
695 err = ip_recv_error(sk, msg, len);
696 goto out;
697 }
698
699 skb = skb_recv_datagram(sk, flags, noblock, &err);
700 if (!skb)
701 goto out;
702
703 copied = skb->len;
704 if (len < copied) {
705 msg->msg_flags |= MSG_TRUNC;
706 copied = len;
707 }
708
709 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
710 if (err)
711 goto done;
712
713 sock_recv_ts_and_drops(msg, sk, skb);
714
715 /* Copy the address. */
716 if (sin) {
717 sin->sin_family = AF_INET;
718 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
719 sin->sin_port = 0;
720 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
721 }
722 if (inet->cmsg_flags)
723 ip_cmsg_recv(msg, skb);
724 if (flags & MSG_TRUNC)
725 copied = skb->len;
726 done:
727 skb_free_datagram(sk, skb);
728 out:
729 if (err)
730 return err;
731 return copied;
732 }
733
734 static int raw_init(struct sock *sk)
735 {
736 struct raw_sock *rp = raw_sk(sk);
737
738 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
739 memset(&rp->filter, 0, sizeof(rp->filter));
740 return 0;
741 }
742
743 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
744 {
745 if (optlen > sizeof(struct icmp_filter))
746 optlen = sizeof(struct icmp_filter);
747 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
748 return -EFAULT;
749 return 0;
750 }
751
752 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
753 {
754 int len, ret = -EFAULT;
755
756 if (get_user(len, optlen))
757 goto out;
758 ret = -EINVAL;
759 if (len < 0)
760 goto out;
761 if (len > sizeof(struct icmp_filter))
762 len = sizeof(struct icmp_filter);
763 ret = -EFAULT;
764 if (put_user(len, optlen) ||
765 copy_to_user(optval, &raw_sk(sk)->filter, len))
766 goto out;
767 ret = 0;
768 out: return ret;
769 }
770
771 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
772 char __user *optval, unsigned int optlen)
773 {
774 if (optname == ICMP_FILTER) {
775 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
776 return -EOPNOTSUPP;
777 else
778 return raw_seticmpfilter(sk, optval, optlen);
779 }
780 return -ENOPROTOOPT;
781 }
782
783 static int raw_setsockopt(struct sock *sk, int level, int optname,
784 char __user *optval, unsigned int optlen)
785 {
786 if (level != SOL_RAW)
787 return ip_setsockopt(sk, level, optname, optval, optlen);
788 return do_raw_setsockopt(sk, level, optname, optval, optlen);
789 }
790
791 #ifdef CONFIG_COMPAT
792 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
793 char __user *optval, unsigned int optlen)
794 {
795 if (level != SOL_RAW)
796 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
797 return do_raw_setsockopt(sk, level, optname, optval, optlen);
798 }
799 #endif
800
801 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
802 char __user *optval, int __user *optlen)
803 {
804 if (optname == ICMP_FILTER) {
805 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
806 return -EOPNOTSUPP;
807 else
808 return raw_geticmpfilter(sk, optval, optlen);
809 }
810 return -ENOPROTOOPT;
811 }
812
813 static int raw_getsockopt(struct sock *sk, int level, int optname,
814 char __user *optval, int __user *optlen)
815 {
816 if (level != SOL_RAW)
817 return ip_getsockopt(sk, level, optname, optval, optlen);
818 return do_raw_getsockopt(sk, level, optname, optval, optlen);
819 }
820
821 #ifdef CONFIG_COMPAT
822 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
823 char __user *optval, int __user *optlen)
824 {
825 if (level != SOL_RAW)
826 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
827 return do_raw_getsockopt(sk, level, optname, optval, optlen);
828 }
829 #endif
830
831 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
832 {
833 switch (cmd) {
834 case SIOCOUTQ: {
835 int amount = sk_wmem_alloc_get(sk);
836
837 return put_user(amount, (int __user *)arg);
838 }
839 case SIOCINQ: {
840 struct sk_buff *skb;
841 int amount = 0;
842
843 spin_lock_bh(&sk->sk_receive_queue.lock);
844 skb = skb_peek(&sk->sk_receive_queue);
845 if (skb != NULL)
846 amount = skb->len;
847 spin_unlock_bh(&sk->sk_receive_queue.lock);
848 return put_user(amount, (int __user *)arg);
849 }
850
851 default:
852 #ifdef CONFIG_IP_MROUTE
853 return ipmr_ioctl(sk, cmd, (void __user *)arg);
854 #else
855 return -ENOIOCTLCMD;
856 #endif
857 }
858 }
859
860 #ifdef CONFIG_COMPAT
861 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
862 {
863 switch (cmd) {
864 case SIOCOUTQ:
865 case SIOCINQ:
866 return -ENOIOCTLCMD;
867 default:
868 #ifdef CONFIG_IP_MROUTE
869 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
870 #else
871 return -ENOIOCTLCMD;
872 #endif
873 }
874 }
875 #endif
876
877 struct proto raw_prot = {
878 .name = "RAW",
879 .owner = THIS_MODULE,
880 .close = raw_close,
881 .destroy = raw_destroy,
882 .connect = ip4_datagram_connect,
883 .disconnect = udp_disconnect,
884 .ioctl = raw_ioctl,
885 .init = raw_init,
886 .setsockopt = raw_setsockopt,
887 .getsockopt = raw_getsockopt,
888 .sendmsg = raw_sendmsg,
889 .recvmsg = raw_recvmsg,
890 .bind = raw_bind,
891 .backlog_rcv = raw_rcv_skb,
892 .hash = raw_hash_sk,
893 .unhash = raw_unhash_sk,
894 .obj_size = sizeof(struct raw_sock),
895 .h.raw_hash = &raw_v4_hashinfo,
896 #ifdef CONFIG_COMPAT
897 .compat_setsockopt = compat_raw_setsockopt,
898 .compat_getsockopt = compat_raw_getsockopt,
899 .compat_ioctl = compat_raw_ioctl,
900 #endif
901 };
902
903 #ifdef CONFIG_PROC_FS
904 static struct sock *raw_get_first(struct seq_file *seq)
905 {
906 struct sock *sk;
907 struct raw_iter_state *state = raw_seq_private(seq);
908
909 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
910 ++state->bucket) {
911 struct hlist_node *node;
912
913 sk_for_each(sk, node, &state->h->ht[state->bucket])
914 if (sock_net(sk) == seq_file_net(seq))
915 goto found;
916 }
917 sk = NULL;
918 found:
919 return sk;
920 }
921
922 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
923 {
924 struct raw_iter_state *state = raw_seq_private(seq);
925
926 do {
927 sk = sk_next(sk);
928 try_again:
929 ;
930 } while (sk && sock_net(sk) != seq_file_net(seq));
931
932 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
933 sk = sk_head(&state->h->ht[state->bucket]);
934 goto try_again;
935 }
936 return sk;
937 }
938
939 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
940 {
941 struct sock *sk = raw_get_first(seq);
942
943 if (sk)
944 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
945 --pos;
946 return pos ? NULL : sk;
947 }
948
949 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
950 {
951 struct raw_iter_state *state = raw_seq_private(seq);
952
953 read_lock(&state->h->lock);
954 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
955 }
956 EXPORT_SYMBOL_GPL(raw_seq_start);
957
958 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
959 {
960 struct sock *sk;
961
962 if (v == SEQ_START_TOKEN)
963 sk = raw_get_first(seq);
964 else
965 sk = raw_get_next(seq, v);
966 ++*pos;
967 return sk;
968 }
969 EXPORT_SYMBOL_GPL(raw_seq_next);
970
971 void raw_seq_stop(struct seq_file *seq, void *v)
972 {
973 struct raw_iter_state *state = raw_seq_private(seq);
974
975 read_unlock(&state->h->lock);
976 }
977 EXPORT_SYMBOL_GPL(raw_seq_stop);
978
979 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
980 {
981 struct inet_sock *inet = inet_sk(sp);
982 __be32 dest = inet->inet_daddr,
983 src = inet->inet_rcv_saddr;
984 __u16 destp = 0,
985 srcp = inet->inet_num;
986
987 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
988 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
989 i, src, srcp, dest, destp, sp->sk_state,
990 sk_wmem_alloc_get(sp),
991 sk_rmem_alloc_get(sp),
992 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
993 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
994 }
995
996 static int raw_seq_show(struct seq_file *seq, void *v)
997 {
998 if (v == SEQ_START_TOKEN)
999 seq_printf(seq, " sl local_address rem_address st tx_queue "
1000 "rx_queue tr tm->when retrnsmt uid timeout "
1001 "inode ref pointer drops\n");
1002 else
1003 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1004 return 0;
1005 }
1006
1007 static const struct seq_operations raw_seq_ops = {
1008 .start = raw_seq_start,
1009 .next = raw_seq_next,
1010 .stop = raw_seq_stop,
1011 .show = raw_seq_show,
1012 };
1013
1014 int raw_seq_open(struct inode *ino, struct file *file,
1015 struct raw_hashinfo *h, const struct seq_operations *ops)
1016 {
1017 int err;
1018 struct raw_iter_state *i;
1019
1020 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1021 if (err < 0)
1022 return err;
1023
1024 i = raw_seq_private((struct seq_file *)file->private_data);
1025 i->h = h;
1026 return 0;
1027 }
1028 EXPORT_SYMBOL_GPL(raw_seq_open);
1029
1030 static int raw_v4_seq_open(struct inode *inode, struct file *file)
1031 {
1032 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1033 }
1034
1035 static const struct file_operations raw_seq_fops = {
1036 .owner = THIS_MODULE,
1037 .open = raw_v4_seq_open,
1038 .read = seq_read,
1039 .llseek = seq_lseek,
1040 .release = seq_release_net,
1041 };
1042
1043 static __net_init int raw_init_net(struct net *net)
1044 {
1045 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
1046 return -ENOMEM;
1047
1048 return 0;
1049 }
1050
1051 static __net_exit void raw_exit_net(struct net *net)
1052 {
1053 proc_net_remove(net, "raw");
1054 }
1055
1056 static __net_initdata struct pernet_operations raw_net_ops = {
1057 .init = raw_init_net,
1058 .exit = raw_exit_net,
1059 };
1060
1061 int __init raw_proc_init(void)
1062 {
1063 return register_pernet_subsys(&raw_net_ops);
1064 }
1065
1066 void __init raw_proc_exit(void)
1067 {
1068 unregister_pernet_subsys(&raw_net_ops);
1069 }
1070 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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