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)->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->num == num &&
119 !(inet->daddr && inet->daddr != raddr) &&
120 !(inet->rcv_saddr && 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 atomic_inc(&sk->sk_drops);
296 kfree_skb(skb);
297 return NET_RX_DROP;
298 }
299
300 return NET_RX_SUCCESS;
301 }
302
303 int raw_rcv(struct sock *sk, struct sk_buff *skb)
304 {
305 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
306 atomic_inc(&sk->sk_drops);
307 kfree_skb(skb);
308 return NET_RX_DROP;
309 }
310 nf_reset(skb);
311
312 skb_push(skb, skb->data - skb_network_header(skb));
313
314 raw_rcv_skb(sk, skb);
315 return 0;
316 }
317
318 static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
319 struct rtable *rt,
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
329 if (length > rt->u.dst.dev->mtu) {
330 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport,
331 rt->u.dst.dev->mtu);
332 return -EMSGSIZE;
333 }
334 if (flags&MSG_PROBE)
335 goto out;
336
337 skb = sock_alloc_send_skb(sk,
338 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15,
339 flags & MSG_DONTWAIT, &err);
340 if (skb == NULL)
341 goto error;
342 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev));
343
344 skb->priority = sk->sk_priority;
345 skb->mark = sk->sk_mark;
346 skb_dst_set(skb, dst_clone(&rt->u.dst));
347
348 skb_reset_network_header(skb);
349 iph = ip_hdr(skb);
350 skb_put(skb, length);
351
352 skb->ip_summed = CHECKSUM_NONE;
353
354 skb->transport_header = skb->network_header;
355 err = memcpy_fromiovecend((void *)iph, from, 0, length);
356 if (err)
357 goto error_fault;
358
359 /* We don't modify invalid header */
360 iphlen = iph->ihl * 4;
361 if (iphlen >= sizeof(*iph) && iphlen <= length) {
362 if (!iph->saddr)
363 iph->saddr = rt->rt_src;
364 iph->check = 0;
365 iph->tot_len = htons(length);
366 if (!iph->id)
367 ip_select_ident(iph, &rt->u.dst, NULL);
368
369 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
370 }
371 if (iph->protocol == IPPROTO_ICMP)
372 icmp_out_count(net, ((struct icmphdr *)
373 skb_transport_header(skb))->type);
374
375 err = NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
376 dst_output);
377 if (err > 0)
378 err = inet->recverr ? net_xmit_errno(err) : 0;
379 if (err)
380 goto error;
381 out:
382 return 0;
383
384 error_fault:
385 err = -EFAULT;
386 kfree_skb(skb);
387 error:
388 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
389 return err;
390 }
391
392 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
393 {
394 struct iovec *iov;
395 u8 __user *type = NULL;
396 u8 __user *code = NULL;
397 int probed = 0;
398 unsigned int i;
399
400 if (!msg->msg_iov)
401 return 0;
402
403 for (i = 0; i < msg->msg_iovlen; i++) {
404 iov = &msg->msg_iov[i];
405 if (!iov)
406 continue;
407
408 switch (fl->proto) {
409 case IPPROTO_ICMP:
410 /* check if one-byte field is readable or not. */
411 if (iov->iov_base && iov->iov_len < 1)
412 break;
413
414 if (!type) {
415 type = iov->iov_base;
416 /* check if code field is readable or not. */
417 if (iov->iov_len > 1)
418 code = type + 1;
419 } else if (!code)
420 code = iov->iov_base;
421
422 if (type && code) {
423 if (get_user(fl->fl_icmp_type, type) ||
424 get_user(fl->fl_icmp_code, code))
425 return -EFAULT;
426 probed = 1;
427 }
428 break;
429 default:
430 probed = 1;
431 break;
432 }
433 if (probed)
434 break;
435 }
436 return 0;
437 }
438
439 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
440 size_t len)
441 {
442 struct inet_sock *inet = inet_sk(sk);
443 struct ipcm_cookie ipc;
444 struct rtable *rt = NULL;
445 int free = 0;
446 __be32 daddr;
447 __be32 saddr;
448 u8 tos;
449 int err;
450
451 err = -EMSGSIZE;
452 if (len > 0xFFFF)
453 goto out;
454
455 /*
456 * Check the flags.
457 */
458
459 err = -EOPNOTSUPP;
460 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
461 goto out; /* compatibility */
462
463 /*
464 * Get and verify the address.
465 */
466
467 if (msg->msg_namelen) {
468 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
469 err = -EINVAL;
470 if (msg->msg_namelen < sizeof(*usin))
471 goto out;
472 if (usin->sin_family != AF_INET) {
473 static int complained;
474 if (!complained++)
475 printk(KERN_INFO "%s forgot to set AF_INET in "
476 "raw sendmsg. Fix it!\n",
477 current->comm);
478 err = -EAFNOSUPPORT;
479 if (usin->sin_family)
480 goto out;
481 }
482 daddr = usin->sin_addr.s_addr;
483 /* ANK: I did not forget to get protocol from port field.
484 * I just do not know, who uses this weirdness.
485 * IP_HDRINCL is much more convenient.
486 */
487 } else {
488 err = -EDESTADDRREQ;
489 if (sk->sk_state != TCP_ESTABLISHED)
490 goto out;
491 daddr = inet->daddr;
492 }
493
494 ipc.addr = inet->saddr;
495 ipc.opt = NULL;
496 ipc.shtx.flags = 0;
497 ipc.oif = sk->sk_bound_dev_if;
498
499 if (msg->msg_controllen) {
500 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
501 if (err)
502 goto out;
503 if (ipc.opt)
504 free = 1;
505 }
506
507 saddr = ipc.addr;
508 ipc.addr = daddr;
509
510 if (!ipc.opt)
511 ipc.opt = inet->opt;
512
513 if (ipc.opt) {
514 err = -EINVAL;
515 /* Linux does not mangle headers on raw sockets,
516 * so that IP options + IP_HDRINCL is non-sense.
517 */
518 if (inet->hdrincl)
519 goto done;
520 if (ipc.opt->srr) {
521 if (!daddr)
522 goto done;
523 daddr = ipc.opt->faddr;
524 }
525 }
526 tos = RT_CONN_FLAGS(sk);
527 if (msg->msg_flags & MSG_DONTROUTE)
528 tos |= RTO_ONLINK;
529
530 if (ipv4_is_multicast(daddr)) {
531 if (!ipc.oif)
532 ipc.oif = inet->mc_index;
533 if (!saddr)
534 saddr = inet->mc_addr;
535 }
536
537 {
538 struct flowi fl = { .oif = ipc.oif,
539 .mark = sk->sk_mark,
540 .nl_u = { .ip4_u =
541 { .daddr = daddr,
542 .saddr = saddr,
543 .tos = tos } },
544 .proto = inet->hdrincl ? IPPROTO_RAW :
545 sk->sk_protocol,
546 };
547 if (!inet->hdrincl) {
548 err = raw_probe_proto_opt(&fl, msg);
549 if (err)
550 goto done;
551 }
552
553 security_sk_classify_flow(sk, &fl);
554 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 1);
555 }
556 if (err)
557 goto done;
558
559 err = -EACCES;
560 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
561 goto done;
562
563 if (msg->msg_flags & MSG_CONFIRM)
564 goto do_confirm;
565 back_from_confirm:
566
567 if (inet->hdrincl)
568 err = raw_send_hdrinc(sk, msg->msg_iov, len,
569 rt, msg->msg_flags);
570
571 else {
572 if (!ipc.addr)
573 ipc.addr = rt->rt_dst;
574 lock_sock(sk);
575 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
576 &ipc, &rt, msg->msg_flags);
577 if (err)
578 ip_flush_pending_frames(sk);
579 else if (!(msg->msg_flags & MSG_MORE))
580 err = ip_push_pending_frames(sk);
581 release_sock(sk);
582 }
583 done:
584 if (free)
585 kfree(ipc.opt);
586 ip_rt_put(rt);
587
588 out:
589 if (err < 0)
590 return err;
591 return len;
592
593 do_confirm:
594 dst_confirm(&rt->u.dst);
595 if (!(msg->msg_flags & MSG_PROBE) || len)
596 goto back_from_confirm;
597 err = 0;
598 goto done;
599 }
600
601 static void raw_close(struct sock *sk, long timeout)
602 {
603 /*
604 * Raw sockets may have direct kernel refereneces. Kill them.
605 */
606 ip_ra_control(sk, 0, NULL);
607
608 sk_common_release(sk);
609 }
610
611 static void raw_destroy(struct sock *sk)
612 {
613 lock_sock(sk);
614 ip_flush_pending_frames(sk);
615 release_sock(sk);
616 }
617
618 /* This gets rid of all the nasties in af_inet. -DaveM */
619 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
620 {
621 struct inet_sock *inet = inet_sk(sk);
622 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
623 int ret = -EINVAL;
624 int chk_addr_ret;
625
626 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
627 goto out;
628 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
629 ret = -EADDRNOTAVAIL;
630 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
631 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
632 goto out;
633 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
634 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
635 inet->saddr = 0; /* Use device */
636 sk_dst_reset(sk);
637 ret = 0;
638 out: return ret;
639 }
640
641 /*
642 * This should be easy, if there is something there
643 * we return it, otherwise we block.
644 */
645
646 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
647 size_t len, int noblock, int flags, int *addr_len)
648 {
649 struct inet_sock *inet = inet_sk(sk);
650 size_t copied = 0;
651 int err = -EOPNOTSUPP;
652 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
653 struct sk_buff *skb;
654
655 if (flags & MSG_OOB)
656 goto out;
657
658 if (addr_len)
659 *addr_len = sizeof(*sin);
660
661 if (flags & MSG_ERRQUEUE) {
662 err = ip_recv_error(sk, msg, len);
663 goto out;
664 }
665
666 skb = skb_recv_datagram(sk, flags, noblock, &err);
667 if (!skb)
668 goto out;
669
670 copied = skb->len;
671 if (len < copied) {
672 msg->msg_flags |= MSG_TRUNC;
673 copied = len;
674 }
675
676 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
677 if (err)
678 goto done;
679
680 sock_recv_timestamp(msg, sk, skb);
681
682 /* Copy the address. */
683 if (sin) {
684 sin->sin_family = AF_INET;
685 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
686 sin->sin_port = 0;
687 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
688 }
689 if (inet->cmsg_flags)
690 ip_cmsg_recv(msg, skb);
691 if (flags & MSG_TRUNC)
692 copied = skb->len;
693 done:
694 skb_free_datagram(sk, skb);
695 out:
696 if (err)
697 return err;
698 return copied;
699 }
700
701 static int raw_init(struct sock *sk)
702 {
703 struct raw_sock *rp = raw_sk(sk);
704
705 if (inet_sk(sk)->num == IPPROTO_ICMP)
706 memset(&rp->filter, 0, sizeof(rp->filter));
707 return 0;
708 }
709
710 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
711 {
712 if (optlen > sizeof(struct icmp_filter))
713 optlen = sizeof(struct icmp_filter);
714 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
715 return -EFAULT;
716 return 0;
717 }
718
719 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
720 {
721 int len, ret = -EFAULT;
722
723 if (get_user(len, optlen))
724 goto out;
725 ret = -EINVAL;
726 if (len < 0)
727 goto out;
728 if (len > sizeof(struct icmp_filter))
729 len = sizeof(struct icmp_filter);
730 ret = -EFAULT;
731 if (put_user(len, optlen) ||
732 copy_to_user(optval, &raw_sk(sk)->filter, len))
733 goto out;
734 ret = 0;
735 out: return ret;
736 }
737
738 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
739 char __user *optval, int optlen)
740 {
741 if (optname == ICMP_FILTER) {
742 if (inet_sk(sk)->num != IPPROTO_ICMP)
743 return -EOPNOTSUPP;
744 else
745 return raw_seticmpfilter(sk, optval, optlen);
746 }
747 return -ENOPROTOOPT;
748 }
749
750 static int raw_setsockopt(struct sock *sk, int level, int optname,
751 char __user *optval, int optlen)
752 {
753 if (level != SOL_RAW)
754 return ip_setsockopt(sk, level, optname, optval, optlen);
755 return do_raw_setsockopt(sk, level, optname, optval, optlen);
756 }
757
758 #ifdef CONFIG_COMPAT
759 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
760 char __user *optval, int optlen)
761 {
762 if (level != SOL_RAW)
763 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
764 return do_raw_setsockopt(sk, level, optname, optval, optlen);
765 }
766 #endif
767
768 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
769 char __user *optval, int __user *optlen)
770 {
771 if (optname == ICMP_FILTER) {
772 if (inet_sk(sk)->num != IPPROTO_ICMP)
773 return -EOPNOTSUPP;
774 else
775 return raw_geticmpfilter(sk, optval, optlen);
776 }
777 return -ENOPROTOOPT;
778 }
779
780 static int raw_getsockopt(struct sock *sk, int level, int optname,
781 char __user *optval, int __user *optlen)
782 {
783 if (level != SOL_RAW)
784 return ip_getsockopt(sk, level, optname, optval, optlen);
785 return do_raw_getsockopt(sk, level, optname, optval, optlen);
786 }
787
788 #ifdef CONFIG_COMPAT
789 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
790 char __user *optval, int __user *optlen)
791 {
792 if (level != SOL_RAW)
793 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
794 return do_raw_getsockopt(sk, level, optname, optval, optlen);
795 }
796 #endif
797
798 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
799 {
800 switch (cmd) {
801 case SIOCOUTQ: {
802 int amount = sk_wmem_alloc_get(sk);
803
804 return put_user(amount, (int __user *)arg);
805 }
806 case SIOCINQ: {
807 struct sk_buff *skb;
808 int amount = 0;
809
810 spin_lock_bh(&sk->sk_receive_queue.lock);
811 skb = skb_peek(&sk->sk_receive_queue);
812 if (skb != NULL)
813 amount = skb->len;
814 spin_unlock_bh(&sk->sk_receive_queue.lock);
815 return put_user(amount, (int __user *)arg);
816 }
817
818 default:
819 #ifdef CONFIG_IP_MROUTE
820 return ipmr_ioctl(sk, cmd, (void __user *)arg);
821 #else
822 return -ENOIOCTLCMD;
823 #endif
824 }
825 }
826
827 struct proto raw_prot = {
828 .name = "RAW",
829 .owner = THIS_MODULE,
830 .close = raw_close,
831 .destroy = raw_destroy,
832 .connect = ip4_datagram_connect,
833 .disconnect = udp_disconnect,
834 .ioctl = raw_ioctl,
835 .init = raw_init,
836 .setsockopt = raw_setsockopt,
837 .getsockopt = raw_getsockopt,
838 .sendmsg = raw_sendmsg,
839 .recvmsg = raw_recvmsg,
840 .bind = raw_bind,
841 .backlog_rcv = raw_rcv_skb,
842 .hash = raw_hash_sk,
843 .unhash = raw_unhash_sk,
844 .obj_size = sizeof(struct raw_sock),
845 .h.raw_hash = &raw_v4_hashinfo,
846 #ifdef CONFIG_COMPAT
847 .compat_setsockopt = compat_raw_setsockopt,
848 .compat_getsockopt = compat_raw_getsockopt,
849 #endif
850 };
851
852 #ifdef CONFIG_PROC_FS
853 static struct sock *raw_get_first(struct seq_file *seq)
854 {
855 struct sock *sk;
856 struct raw_iter_state *state = raw_seq_private(seq);
857
858 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
859 ++state->bucket) {
860 struct hlist_node *node;
861
862 sk_for_each(sk, node, &state->h->ht[state->bucket])
863 if (sock_net(sk) == seq_file_net(seq))
864 goto found;
865 }
866 sk = NULL;
867 found:
868 return sk;
869 }
870
871 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
872 {
873 struct raw_iter_state *state = raw_seq_private(seq);
874
875 do {
876 sk = sk_next(sk);
877 try_again:
878 ;
879 } while (sk && sock_net(sk) != seq_file_net(seq));
880
881 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
882 sk = sk_head(&state->h->ht[state->bucket]);
883 goto try_again;
884 }
885 return sk;
886 }
887
888 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
889 {
890 struct sock *sk = raw_get_first(seq);
891
892 if (sk)
893 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
894 --pos;
895 return pos ? NULL : sk;
896 }
897
898 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
899 {
900 struct raw_iter_state *state = raw_seq_private(seq);
901
902 read_lock(&state->h->lock);
903 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
904 }
905 EXPORT_SYMBOL_GPL(raw_seq_start);
906
907 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
908 {
909 struct sock *sk;
910
911 if (v == SEQ_START_TOKEN)
912 sk = raw_get_first(seq);
913 else
914 sk = raw_get_next(seq, v);
915 ++*pos;
916 return sk;
917 }
918 EXPORT_SYMBOL_GPL(raw_seq_next);
919
920 void raw_seq_stop(struct seq_file *seq, void *v)
921 {
922 struct raw_iter_state *state = raw_seq_private(seq);
923
924 read_unlock(&state->h->lock);
925 }
926 EXPORT_SYMBOL_GPL(raw_seq_stop);
927
928 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
929 {
930 struct inet_sock *inet = inet_sk(sp);
931 __be32 dest = inet->daddr,
932 src = inet->rcv_saddr;
933 __u16 destp = 0,
934 srcp = inet->num;
935
936 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
937 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
938 i, src, srcp, dest, destp, sp->sk_state,
939 sk_wmem_alloc_get(sp),
940 sk_rmem_alloc_get(sp),
941 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
942 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
943 }
944
945 static int raw_seq_show(struct seq_file *seq, void *v)
946 {
947 if (v == SEQ_START_TOKEN)
948 seq_printf(seq, " sl local_address rem_address st tx_queue "
949 "rx_queue tr tm->when retrnsmt uid timeout "
950 "inode ref pointer drops\n");
951 else
952 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
953 return 0;
954 }
955
956 static const struct seq_operations raw_seq_ops = {
957 .start = raw_seq_start,
958 .next = raw_seq_next,
959 .stop = raw_seq_stop,
960 .show = raw_seq_show,
961 };
962
963 int raw_seq_open(struct inode *ino, struct file *file,
964 struct raw_hashinfo *h, const struct seq_operations *ops)
965 {
966 int err;
967 struct raw_iter_state *i;
968
969 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
970 if (err < 0)
971 return err;
972
973 i = raw_seq_private((struct seq_file *)file->private_data);
974 i->h = h;
975 return 0;
976 }
977 EXPORT_SYMBOL_GPL(raw_seq_open);
978
979 static int raw_v4_seq_open(struct inode *inode, struct file *file)
980 {
981 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
982 }
983
984 static const struct file_operations raw_seq_fops = {
985 .owner = THIS_MODULE,
986 .open = raw_v4_seq_open,
987 .read = seq_read,
988 .llseek = seq_lseek,
989 .release = seq_release_net,
990 };
991
992 static __net_init int raw_init_net(struct net *net)
993 {
994 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
995 return -ENOMEM;
996
997 return 0;
998 }
999
1000 static __net_exit void raw_exit_net(struct net *net)
1001 {
1002 proc_net_remove(net, "raw");
1003 }
1004
1005 static __net_initdata struct pernet_operations raw_net_ops = {
1006 .init = raw_init_net,
1007 .exit = raw_exit_net,
1008 };
1009
1010 int __init raw_proc_init(void)
1011 {
1012 return register_pernet_subsys(&raw_net_ops);
1013 }
1014
1015 void __init raw_proc_exit(void)
1016 {
1017 unregister_pernet_subsys(&raw_net_ops);
1018 }
1019 #endif /* CONFIG_PROC_FS */
1020
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