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Linux 2.6.33-rc8
[linux-2.6/lguest.git] / net / ipv4 / raw.c
blobce154b47f1da08fd5c0ef874920bbb70aa1e90bb
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 <asm/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/gfp.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
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, 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 struct iphdr *iph = (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 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 = (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 = (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 (sock_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, void *from, size_t length,
318 struct rtable *rt,
319 unsigned int flags)
320 {
321 struct inet_sock *inet = inet_sk(sk);
322 struct net *net = sock_net(sk);
323 struct iphdr *iph;
324 struct sk_buff *skb;
325 unsigned int iphlen;
326 int err;
327
328 if (length > rt->u.dst.dev->mtu) {
329 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->inet_dport,
330 rt->u.dst.dev->mtu);
331 return -EMSGSIZE;
332 }
333 if (flags&MSG_PROBE)
334 goto out;
335
336 skb = sock_alloc_send_skb(sk,
337 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15,
338 flags & MSG_DONTWAIT, &err);
339 if (skb == NULL)
340 goto error;
341 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev));
342
343 skb->priority = sk->sk_priority;
344 skb->mark = sk->sk_mark;
345 skb_dst_set(skb, dst_clone(&rt->u.dst));
346
347 skb_reset_network_header(skb);
348 iph = ip_hdr(skb);
349 skb_put(skb, length);
350
351 skb->ip_summed = CHECKSUM_NONE;
352
353 skb->transport_header = skb->network_header;
354 err = -EFAULT;
355 if (memcpy_fromiovecend((void *)iph, from, 0, length))
356 goto error_free;
357
358 iphlen = iph->ihl * 4;
359
360 /*
361 * We don't want to modify the ip header, but we do need to
362 * be sure that it won't cause problems later along the network
363 * stack. Specifically we want to make sure that iph->ihl is a
364 * sane value. If ihl points beyond the length of the buffer passed
365 * in, reject the frame as invalid
366 */
367 err = -EINVAL;
368 if (iphlen > length)
369 goto error_free;
370
371 if (iphlen >= sizeof(*iph)) {
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(net, ((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 = net_xmit_errno(err);
389 if (err)
390 goto error;
391 out:
392 return 0;
393
394 error_free:
395 kfree_skb(skb);
396 error:
397 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
398 if (err == -ENOBUFS && !inet->recverr)
399 err = 0;
400 return err;
401 }
402
403 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
404 {
405 struct iovec *iov;
406 u8 __user *type = NULL;
407 u8 __user *code = NULL;
408 int probed = 0;
409 unsigned int i;
410
411 if (!msg->msg_iov)
412 return 0;
413
414 for (i = 0; i < msg->msg_iovlen; i++) {
415 iov = &msg->msg_iov[i];
416 if (!iov)
417 continue;
418
419 switch (fl->proto) {
420 case IPPROTO_ICMP:
421 /* check if one-byte field is readable or not. */
422 if (iov->iov_base && iov->iov_len < 1)
423 break;
424
425 if (!type) {
426 type = iov->iov_base;
427 /* check if code field is readable or not. */
428 if (iov->iov_len > 1)
429 code = type + 1;
430 } else if (!code)
431 code = iov->iov_base;
432
433 if (type && code) {
434 if (get_user(fl->fl_icmp_type, type) ||
435 get_user(fl->fl_icmp_code, code))
436 return -EFAULT;
437 probed = 1;
438 }
439 break;
440 default:
441 probed = 1;
442 break;
443 }
444 if (probed)
445 break;
446 }
447 return 0;
448 }
449
450 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
451 size_t len)
452 {
453 struct inet_sock *inet = inet_sk(sk);
454 struct ipcm_cookie ipc;
455 struct rtable *rt = NULL;
456 int free = 0;
457 __be32 daddr;
458 __be32 saddr;
459 u8 tos;
460 int err;
461
462 err = -EMSGSIZE;
463 if (len > 0xFFFF)
464 goto out;
465
466 /*
467 * Check the flags.
468 */
469
470 err = -EOPNOTSUPP;
471 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
472 goto out; /* compatibility */
473
474 /*
475 * Get and verify the address.
476 */
477
478 if (msg->msg_namelen) {
479 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
480 err = -EINVAL;
481 if (msg->msg_namelen < sizeof(*usin))
482 goto out;
483 if (usin->sin_family != AF_INET) {
484 static int complained;
485 if (!complained++)
486 printk(KERN_INFO "%s forgot to set AF_INET in "
487 "raw sendmsg. Fix it!\n",
488 current->comm);
489 err = -EAFNOSUPPORT;
490 if (usin->sin_family)
491 goto out;
492 }
493 daddr = usin->sin_addr.s_addr;
494 /* ANK: I did not forget to get protocol from port field.
495 * I just do not know, who uses this weirdness.
496 * IP_HDRINCL is much more convenient.
497 */
498 } else {
499 err = -EDESTADDRREQ;
500 if (sk->sk_state != TCP_ESTABLISHED)
501 goto out;
502 daddr = inet->inet_daddr;
503 }
504
505 ipc.addr = inet->inet_saddr;
506 ipc.opt = NULL;
507 ipc.shtx.flags = 0;
508 ipc.oif = sk->sk_bound_dev_if;
509
510 if (msg->msg_controllen) {
511 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
512 if (err)
513 goto out;
514 if (ipc.opt)
515 free = 1;
516 }
517
518 saddr = ipc.addr;
519 ipc.addr = daddr;
520
521 if (!ipc.opt)
522 ipc.opt = inet->opt;
523
524 if (ipc.opt) {
525 err = -EINVAL;
526 /* Linux does not mangle headers on raw sockets,
527 * so that IP options + IP_HDRINCL is non-sense.
528 */
529 if (inet->hdrincl)
530 goto done;
531 if (ipc.opt->srr) {
532 if (!daddr)
533 goto done;
534 daddr = ipc.opt->faddr;
535 }
536 }
537 tos = RT_CONN_FLAGS(sk);
538 if (msg->msg_flags & MSG_DONTROUTE)
539 tos |= RTO_ONLINK;
540
541 if (ipv4_is_multicast(daddr)) {
542 if (!ipc.oif)
543 ipc.oif = inet->mc_index;
544 if (!saddr)
545 saddr = inet->mc_addr;
546 }
547
548 {
549 struct flowi fl = { .oif = ipc.oif,
550 .mark = sk->sk_mark,
551 .nl_u = { .ip4_u =
552 { .daddr = daddr,
553 .saddr = saddr,
554 .tos = tos } },
555 .proto = inet->hdrincl ? IPPROTO_RAW :
556 sk->sk_protocol,
557 };
558 if (!inet->hdrincl) {
559 err = raw_probe_proto_opt(&fl, msg);
560 if (err)
561 goto done;
562 }
563
564 security_sk_classify_flow(sk, &fl);
565 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 1);
566 }
567 if (err)
568 goto done;
569
570 err = -EACCES;
571 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
572 goto done;
573
574 if (msg->msg_flags & MSG_CONFIRM)
575 goto do_confirm;
576 back_from_confirm:
577
578 if (inet->hdrincl)
579 err = raw_send_hdrinc(sk, msg->msg_iov, len,
580 rt, msg->msg_flags);
581
582 else {
583 if (!ipc.addr)
584 ipc.addr = rt->rt_dst;
585 lock_sock(sk);
586 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
587 &ipc, &rt, msg->msg_flags);
588 if (err)
589 ip_flush_pending_frames(sk);
590 else if (!(msg->msg_flags & MSG_MORE)) {
591 err = ip_push_pending_frames(sk);
592 if (err == -ENOBUFS && !inet->recverr)
593 err = 0;
594 }
595 release_sock(sk);
596 }
597 done:
598 if (free)
599 kfree(ipc.opt);
600 ip_rt_put(rt);
601
602 out:
603 if (err < 0)
604 return err;
605 return len;
606
607 do_confirm:
608 dst_confirm(&rt->u.dst);
609 if (!(msg->msg_flags & MSG_PROBE) || len)
610 goto back_from_confirm;
611 err = 0;
612 goto done;
613 }
614
615 static void raw_close(struct sock *sk, long timeout)
616 {
617 /*
618 * Raw sockets may have direct kernel refereneces. Kill them.
619 */
620 ip_ra_control(sk, 0, NULL);
621
622 sk_common_release(sk);
623 }
624
625 static void raw_destroy(struct sock *sk)
626 {
627 lock_sock(sk);
628 ip_flush_pending_frames(sk);
629 release_sock(sk);
630 }
631
632 /* This gets rid of all the nasties in af_inet. -DaveM */
633 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
634 {
635 struct inet_sock *inet = inet_sk(sk);
636 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
637 int ret = -EINVAL;
638 int chk_addr_ret;
639
640 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
641 goto out;
642 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
643 ret = -EADDRNOTAVAIL;
644 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
645 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
646 goto out;
647 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
648 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
649 inet->inet_saddr = 0; /* Use device */
650 sk_dst_reset(sk);
651 ret = 0;
652 out: return ret;
653 }
654
655 /*
656 * This should be easy, if there is something there
657 * we return it, otherwise we block.
658 */
659
660 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
661 size_t len, int noblock, int flags, int *addr_len)
662 {
663 struct inet_sock *inet = inet_sk(sk);
664 size_t copied = 0;
665 int err = -EOPNOTSUPP;
666 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
667 struct sk_buff *skb;
668
669 if (flags & MSG_OOB)
670 goto out;
671
672 if (addr_len)
673 *addr_len = sizeof(*sin);
674
675 if (flags & MSG_ERRQUEUE) {
676 err = ip_recv_error(sk, msg, len);
677 goto out;
678 }
679
680 skb = skb_recv_datagram(sk, flags, noblock, &err);
681 if (!skb)
682 goto out;
683
684 copied = skb->len;
685 if (len < copied) {
686 msg->msg_flags |= MSG_TRUNC;
687 copied = len;
688 }
689
690 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
691 if (err)
692 goto done;
693
694 sock_recv_ts_and_drops(msg, sk, skb);
695
696 /* Copy the address. */
697 if (sin) {
698 sin->sin_family = AF_INET;
699 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
700 sin->sin_port = 0;
701 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
702 }
703 if (inet->cmsg_flags)
704 ip_cmsg_recv(msg, skb);
705 if (flags & MSG_TRUNC)
706 copied = skb->len;
707 done:
708 skb_free_datagram(sk, skb);
709 out:
710 if (err)
711 return err;
712 return copied;
713 }
714
715 static int raw_init(struct sock *sk)
716 {
717 struct raw_sock *rp = raw_sk(sk);
718
719 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
720 memset(&rp->filter, 0, sizeof(rp->filter));
721 return 0;
722 }
723
724 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
725 {
726 if (optlen > sizeof(struct icmp_filter))
727 optlen = sizeof(struct icmp_filter);
728 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
729 return -EFAULT;
730 return 0;
731 }
732
733 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
734 {
735 int len, ret = -EFAULT;
736
737 if (get_user(len, optlen))
738 goto out;
739 ret = -EINVAL;
740 if (len < 0)
741 goto out;
742 if (len > sizeof(struct icmp_filter))
743 len = sizeof(struct icmp_filter);
744 ret = -EFAULT;
745 if (put_user(len, optlen) ||
746 copy_to_user(optval, &raw_sk(sk)->filter, len))
747 goto out;
748 ret = 0;
749 out: return ret;
750 }
751
752 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
753 char __user *optval, unsigned int optlen)
754 {
755 if (optname == ICMP_FILTER) {
756 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
757 return -EOPNOTSUPP;
758 else
759 return raw_seticmpfilter(sk, optval, optlen);
760 }
761 return -ENOPROTOOPT;
762 }
763
764 static int raw_setsockopt(struct sock *sk, int level, int optname,
765 char __user *optval, unsigned int optlen)
766 {
767 if (level != SOL_RAW)
768 return ip_setsockopt(sk, level, optname, optval, optlen);
769 return do_raw_setsockopt(sk, level, optname, optval, optlen);
770 }
771
772 #ifdef CONFIG_COMPAT
773 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
774 char __user *optval, unsigned int optlen)
775 {
776 if (level != SOL_RAW)
777 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
778 return do_raw_setsockopt(sk, level, optname, optval, optlen);
779 }
780 #endif
781
782 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
783 char __user *optval, int __user *optlen)
784 {
785 if (optname == ICMP_FILTER) {
786 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
787 return -EOPNOTSUPP;
788 else
789 return raw_geticmpfilter(sk, optval, optlen);
790 }
791 return -ENOPROTOOPT;
792 }
793
794 static int raw_getsockopt(struct sock *sk, int level, int optname,
795 char __user *optval, int __user *optlen)
796 {
797 if (level != SOL_RAW)
798 return ip_getsockopt(sk, level, optname, optval, optlen);
799 return do_raw_getsockopt(sk, level, optname, optval, optlen);
800 }
801
802 #ifdef CONFIG_COMPAT
803 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
804 char __user *optval, int __user *optlen)
805 {
806 if (level != SOL_RAW)
807 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
808 return do_raw_getsockopt(sk, level, optname, optval, optlen);
809 }
810 #endif
811
812 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
813 {
814 switch (cmd) {
815 case SIOCOUTQ: {
816 int amount = sk_wmem_alloc_get(sk);
817
818 return put_user(amount, (int __user *)arg);
819 }
820 case SIOCINQ: {
821 struct sk_buff *skb;
822 int amount = 0;
823
824 spin_lock_bh(&sk->sk_receive_queue.lock);
825 skb = skb_peek(&sk->sk_receive_queue);
826 if (skb != NULL)
827 amount = skb->len;
828 spin_unlock_bh(&sk->sk_receive_queue.lock);
829 return put_user(amount, (int __user *)arg);
830 }
831
832 default:
833 #ifdef CONFIG_IP_MROUTE
834 return ipmr_ioctl(sk, cmd, (void __user *)arg);
835 #else
836 return -ENOIOCTLCMD;
837 #endif
838 }
839 }
840
841 struct proto raw_prot = {
842 .name = "RAW",
843 .owner = THIS_MODULE,
844 .close = raw_close,
845 .destroy = raw_destroy,
846 .connect = ip4_datagram_connect,
847 .disconnect = udp_disconnect,
848 .ioctl = raw_ioctl,
849 .init = raw_init,
850 .setsockopt = raw_setsockopt,
851 .getsockopt = raw_getsockopt,
852 .sendmsg = raw_sendmsg,
853 .recvmsg = raw_recvmsg,
854 .bind = raw_bind,
855 .backlog_rcv = raw_rcv_skb,
856 .hash = raw_hash_sk,
857 .unhash = raw_unhash_sk,
858 .obj_size = sizeof(struct raw_sock),
859 .h.raw_hash = &raw_v4_hashinfo,
860 #ifdef CONFIG_COMPAT
861 .compat_setsockopt = compat_raw_setsockopt,
862 .compat_getsockopt = compat_raw_getsockopt,
863 #endif
864 };
865
866 #ifdef CONFIG_PROC_FS
867 static struct sock *raw_get_first(struct seq_file *seq)
868 {
869 struct sock *sk;
870 struct raw_iter_state *state = raw_seq_private(seq);
871
872 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
873 ++state->bucket) {
874 struct hlist_node *node;
875
876 sk_for_each(sk, node, &state->h->ht[state->bucket])
877 if (sock_net(sk) == seq_file_net(seq))
878 goto found;
879 }
880 sk = NULL;
881 found:
882 return sk;
883 }
884
885 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
886 {
887 struct raw_iter_state *state = raw_seq_private(seq);
888
889 do {
890 sk = sk_next(sk);
891 try_again:
892 ;
893 } while (sk && sock_net(sk) != seq_file_net(seq));
894
895 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
896 sk = sk_head(&state->h->ht[state->bucket]);
897 goto try_again;
898 }
899 return sk;
900 }
901
902 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
903 {
904 struct sock *sk = raw_get_first(seq);
905
906 if (sk)
907 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
908 --pos;
909 return pos ? NULL : sk;
910 }
911
912 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
913 {
914 struct raw_iter_state *state = raw_seq_private(seq);
915
916 read_lock(&state->h->lock);
917 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
918 }
919 EXPORT_SYMBOL_GPL(raw_seq_start);
920
921 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
922 {
923 struct sock *sk;
924
925 if (v == SEQ_START_TOKEN)
926 sk = raw_get_first(seq);
927 else
928 sk = raw_get_next(seq, v);
929 ++*pos;
930 return sk;
931 }
932 EXPORT_SYMBOL_GPL(raw_seq_next);
933
934 void raw_seq_stop(struct seq_file *seq, void *v)
935 {
936 struct raw_iter_state *state = raw_seq_private(seq);
937
938 read_unlock(&state->h->lock);
939 }
940 EXPORT_SYMBOL_GPL(raw_seq_stop);
941
942 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
943 {
944 struct inet_sock *inet = inet_sk(sp);
945 __be32 dest = inet->inet_daddr,
946 src = inet->inet_rcv_saddr;
947 __u16 destp = 0,
948 srcp = inet->inet_num;
949
950 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
951 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
952 i, src, srcp, dest, destp, sp->sk_state,
953 sk_wmem_alloc_get(sp),
954 sk_rmem_alloc_get(sp),
955 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
956 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
957 }
958
959 static int raw_seq_show(struct seq_file *seq, void *v)
960 {
961 if (v == SEQ_START_TOKEN)
962 seq_printf(seq, " sl local_address rem_address st tx_queue "
963 "rx_queue tr tm->when retrnsmt uid timeout "
964 "inode ref pointer drops\n");
965 else
966 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
967 return 0;
968 }
969
970 static const struct seq_operations raw_seq_ops = {
971 .start = raw_seq_start,
972 .next = raw_seq_next,
973 .stop = raw_seq_stop,
974 .show = raw_seq_show,
975 };
976
977 int raw_seq_open(struct inode *ino, struct file *file,
978 struct raw_hashinfo *h, const struct seq_operations *ops)
979 {
980 int err;
981 struct raw_iter_state *i;
982
983 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
984 if (err < 0)
985 return err;
986
987 i = raw_seq_private((struct seq_file *)file->private_data);
988 i->h = h;
989 return 0;
990 }
991 EXPORT_SYMBOL_GPL(raw_seq_open);
992
993 static int raw_v4_seq_open(struct inode *inode, struct file *file)
994 {
995 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
996 }
997
998 static const struct file_operations raw_seq_fops = {
999 .owner = THIS_MODULE,
1000 .open = raw_v4_seq_open,
1001 .read = seq_read,
1002 .llseek = seq_lseek,
1003 .release = seq_release_net,
1004 };
1005
1006 static __net_init int raw_init_net(struct net *net)
1007 {
1008 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
1009 return -ENOMEM;
1010
1011 return 0;
1012 }
1013
1014 static __net_exit void raw_exit_net(struct net *net)
1015 {
1016 proc_net_remove(net, "raw");
1017 }
1018
1019 static __net_initdata struct pernet_operations raw_net_ops = {
1020 .init = raw_init_net,
1021 .exit = raw_exit_net,
1022 };
1023
1024 int __init raw_proc_init(void)
1025 {
1026 return register_pernet_subsys(&raw_net_ops);
1027 }
1028
1029 void __init raw_proc_exit(void)
1030 {
1031 unregister_pernet_subsys(&raw_net_ops);
1032 }
1033 #endif /* CONFIG_PROC_FS */
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