blob: b80987d2fc552202f8c88a4c7dc4b8b4455ba05c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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 */
Dave Jonesbf0d5242006-09-22 14:00:29 -070041
Alan Cox715b49e2006-01-18 17:44:07 -080042#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <asm/atomic.h>
44#include <asm/byteorder.h>
45#include <asm/current.h>
46#include <asm/uaccess.h>
47#include <asm/ioctls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/skbuff.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020062#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#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>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070073#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070074#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
83struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE];
84DEFINE_RWLOCK(raw_v4_lock);
85
86static void raw_v4_hash(struct sock *sk)
87{
88 struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num &
89 (RAWV4_HTABLE_SIZE - 1)];
90
91 write_lock_bh(&raw_v4_lock);
92 sk_add_node(sk, head);
93 sock_prot_inc_use(sk->sk_prot);
94 write_unlock_bh(&raw_v4_lock);
95}
96
97static void raw_v4_unhash(struct sock *sk)
98{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090099 write_lock_bh(&raw_v4_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (sk_del_node_init(sk))
101 sock_prot_dec_use(sk->sk_prot);
102 write_unlock_bh(&raw_v4_lock);
103}
104
105struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num,
Alexey Dobriyan6d741652006-06-05 21:06:41 -0700106 __be32 raddr, __be32 laddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 int dif)
108{
109 struct hlist_node *node;
110
111 sk_for_each_from(sk, node) {
112 struct inet_sock *inet = inet_sk(sk);
113
114 if (inet->num == num &&
115 !(inet->daddr && inet->daddr != raddr) &&
116 !(inet->rcv_saddr && inet->rcv_saddr != laddr) &&
117 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
118 goto found; /* gotcha */
119 }
120 sk = NULL;
121found:
122 return sk;
123}
124
125/*
126 * 0 - deliver
127 * 1 - block
128 */
129static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
130{
131 int type;
132
133 if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
134 return 1;
135
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300136 type = icmp_hdr(skb)->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (type < 32) {
138 __u32 data = raw_sk(sk)->filter.data;
139
140 return ((1 << type) & data) != 0;
141 }
142
143 /* Do not block unknown ICMP types */
144 return 0;
145}
146
147/* IP input processing comes here for RAW socket delivery.
148 * Caller owns SKB, so we must make clones.
149 *
150 * RFC 1122: SHOULD pass TOS value up to the transport layer.
151 * -> It does. And not only TOS, but all IP header.
152 */
Patrick McHardyd13964f2005-08-09 19:45:02 -0700153int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
155 struct sock *sk;
156 struct hlist_head *head;
Patrick McHardyd13964f2005-08-09 19:45:02 -0700157 int delivered = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 read_lock(&raw_v4_lock);
160 head = &raw_v4_htable[hash];
161 if (hlist_empty(head))
162 goto out;
163 sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
164 iph->saddr, iph->daddr,
165 skb->dev->ifindex);
166
167 while (sk) {
Patrick McHardyd13964f2005-08-09 19:45:02 -0700168 delivered = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
170 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
171
172 /* Not releasing hash table! */
173 if (clone)
174 raw_rcv(sk, clone);
175 }
176 sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
177 iph->saddr, iph->daddr,
178 skb->dev->ifindex);
179 }
180out:
181 read_unlock(&raw_v4_lock);
Patrick McHardyd13964f2005-08-09 19:45:02 -0700182 return delivered;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
185void raw_err (struct sock *sk, struct sk_buff *skb, u32 info)
186{
187 struct inet_sock *inet = inet_sk(sk);
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300188 const int type = icmp_hdr(skb)->type;
189 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 int err = 0;
191 int harderr = 0;
192
193 /* Report error on raw socket, if:
194 1. User requested ip_recverr.
195 2. Socket is connected (otherwise the error indication
196 is useless without ip_recverr and error is hard.
197 */
198 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
199 return;
200
201 switch (type) {
202 default:
203 case ICMP_TIME_EXCEEDED:
204 err = EHOSTUNREACH;
205 break;
206 case ICMP_SOURCE_QUENCH:
207 return;
208 case ICMP_PARAMETERPROB:
209 err = EPROTO;
210 harderr = 1;
211 break;
212 case ICMP_DEST_UNREACH:
213 err = EHOSTUNREACH;
214 if (code > NR_ICMP_UNREACH)
215 break;
216 err = icmp_err_convert[code].errno;
217 harderr = icmp_err_convert[code].fatal;
218 if (code == ICMP_FRAG_NEEDED) {
219 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
220 err = EMSGSIZE;
221 }
222 }
223
224 if (inet->recverr) {
225 struct iphdr *iph = (struct iphdr*)skb->data;
226 u8 *payload = skb->data + (iph->ihl << 2);
227
228 if (inet->hdrincl)
229 payload = skb->data;
230 ip_icmp_error(sk, skb, err, 0, info, payload);
231 }
232
233 if (inet->recverr || harderr) {
234 sk->sk_err = err;
235 sk->sk_error_report(sk);
236 }
237}
238
239static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
240{
241 /* Charge it to the socket. */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 if (sock_queue_rcv_skb(sk, skb) < 0) {
Wang Chen33c732c2007-11-13 20:30:01 -0800244 atomic_inc(&sk->sk_drops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 kfree_skb(skb);
246 return NET_RX_DROP;
247 }
248
249 return NET_RX_SUCCESS;
250}
251
252int raw_rcv(struct sock *sk, struct sk_buff *skb)
253{
254 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
Wang Chen33c732c2007-11-13 20:30:01 -0800255 atomic_inc(&sk->sk_drops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 kfree_skb(skb);
257 return NET_RX_DROP;
258 }
Patrick McHardyb59c2702006-01-06 23:06:10 -0800259 nf_reset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700261 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 raw_rcv_skb(sk, skb);
264 return 0;
265}
266
Jesper Juhlf7d7fc02005-06-18 23:00:34 -0700267static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900268 struct rtable *rt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 unsigned int flags)
270{
271 struct inet_sock *inet = inet_sk(sk);
272 int hh_len;
273 struct iphdr *iph;
274 struct sk_buff *skb;
Herbert Xuf844c742008-01-05 23:14:44 -0800275 unsigned int iphlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 int err;
277
278 if (length > rt->u.dst.dev->mtu) {
279 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport,
280 rt->u.dst.dev->mtu);
281 return -EMSGSIZE;
282 }
283 if (flags&MSG_PROBE)
284 goto out;
285
286 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
287
288 skb = sock_alloc_send_skb(sk, length+hh_len+15,
289 flags&MSG_DONTWAIT, &err);
290 if (skb == NULL)
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900291 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 skb_reserve(skb, hh_len);
293
294 skb->priority = sk->sk_priority;
295 skb->dst = dst_clone(&rt->u.dst);
296
Arnaldo Carvalho de Melo7e28ecc2007-03-10 18:40:59 -0300297 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700298 iph = ip_hdr(skb);
Arnaldo Carvalho de Melo7e28ecc2007-03-10 18:40:59 -0300299 skb_put(skb, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301 skb->ip_summed = CHECKSUM_NONE;
302
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700303 skb->transport_header = skb->network_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 err = memcpy_fromiovecend((void *)iph, from, 0, length);
305 if (err)
306 goto error_fault;
307
308 /* We don't modify invalid header */
Herbert Xuf844c742008-01-05 23:14:44 -0800309 iphlen = iph->ihl * 4;
310 if (iphlen >= sizeof(*iph) && iphlen <= length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 if (!iph->saddr)
312 iph->saddr = rt->rt_src;
313 iph->check = 0;
314 iph->tot_len = htons(length);
315 if (!iph->id)
316 ip_select_ident(iph, &rt->u.dst, NULL);
317
318 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
319 }
David L Stevens96793b42007-09-17 09:57:33 -0700320 if (iph->protocol == IPPROTO_ICMP)
321 icmp_out_count(((struct icmphdr *)
322 skb_transport_header(skb))->type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Patrick McHardy6e23ae22007-11-19 18:53:30 -0800324 err = NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 dst_output);
326 if (err > 0)
327 err = inet->recverr ? net_xmit_errno(err) : 0;
328 if (err)
329 goto error;
330out:
331 return 0;
332
333error_fault:
334 err = -EFAULT;
335 kfree_skb(skb);
336error:
337 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900338 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
340
Heiko Carstensa27b58f2006-10-30 15:06:12 -0800341static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342{
343 struct iovec *iov;
344 u8 __user *type = NULL;
345 u8 __user *code = NULL;
346 int probed = 0;
Jesper Juhl93765d82005-06-18 23:00:15 -0700347 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 if (!msg->msg_iov)
Heiko Carstensa27b58f2006-10-30 15:06:12 -0800350 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352 for (i = 0; i < msg->msg_iovlen; i++) {
353 iov = &msg->msg_iov[i];
354 if (!iov)
355 continue;
356
357 switch (fl->proto) {
358 case IPPROTO_ICMP:
359 /* check if one-byte field is readable or not. */
360 if (iov->iov_base && iov->iov_len < 1)
361 break;
362
363 if (!type) {
364 type = iov->iov_base;
365 /* check if code field is readable or not. */
366 if (iov->iov_len > 1)
367 code = type + 1;
368 } else if (!code)
369 code = iov->iov_base;
370
371 if (type && code) {
Heiko Carstensa27b58f2006-10-30 15:06:12 -0800372 if (get_user(fl->fl_icmp_type, type) ||
373 get_user(fl->fl_icmp_code, code))
374 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 probed = 1;
376 }
377 break;
378 default:
379 probed = 1;
380 break;
381 }
382 if (probed)
383 break;
384 }
Heiko Carstensa27b58f2006-10-30 15:06:12 -0800385 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386}
387
388static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
389 size_t len)
390{
391 struct inet_sock *inet = inet_sk(sk);
392 struct ipcm_cookie ipc;
393 struct rtable *rt = NULL;
394 int free = 0;
Al Viro3ca3c682006-09-27 18:28:07 -0700395 __be32 daddr;
Al Viroc1d18f92006-09-27 18:28:28 -0700396 __be32 saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 u8 tos;
398 int err;
399
400 err = -EMSGSIZE;
Jesper Juhl926d4b82005-06-18 23:00:00 -0700401 if (len > 0xFFFF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 goto out;
403
404 /*
405 * Check the flags.
406 */
407
408 err = -EOPNOTSUPP;
409 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
410 goto out; /* compatibility */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900413 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 */
415
416 if (msg->msg_namelen) {
417 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
418 err = -EINVAL;
419 if (msg->msg_namelen < sizeof(*usin))
420 goto out;
421 if (usin->sin_family != AF_INET) {
422 static int complained;
423 if (!complained++)
424 printk(KERN_INFO "%s forgot to set AF_INET in "
425 "raw sendmsg. Fix it!\n",
426 current->comm);
427 err = -EAFNOSUPPORT;
428 if (usin->sin_family)
429 goto out;
430 }
431 daddr = usin->sin_addr.s_addr;
432 /* ANK: I did not forget to get protocol from port field.
433 * I just do not know, who uses this weirdness.
434 * IP_HDRINCL is much more convenient.
435 */
436 } else {
437 err = -EDESTADDRREQ;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900438 if (sk->sk_state != TCP_ESTABLISHED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 goto out;
440 daddr = inet->daddr;
441 }
442
443 ipc.addr = inet->saddr;
444 ipc.opt = NULL;
445 ipc.oif = sk->sk_bound_dev_if;
446
447 if (msg->msg_controllen) {
448 err = ip_cmsg_send(msg, &ipc);
449 if (err)
450 goto out;
451 if (ipc.opt)
452 free = 1;
453 }
454
455 saddr = ipc.addr;
456 ipc.addr = daddr;
457
458 if (!ipc.opt)
459 ipc.opt = inet->opt;
460
461 if (ipc.opt) {
462 err = -EINVAL;
463 /* Linux does not mangle headers on raw sockets,
464 * so that IP options + IP_HDRINCL is non-sense.
465 */
466 if (inet->hdrincl)
467 goto done;
468 if (ipc.opt->srr) {
469 if (!daddr)
470 goto done;
471 daddr = ipc.opt->faddr;
472 }
473 }
474 tos = RT_CONN_FLAGS(sk);
475 if (msg->msg_flags & MSG_DONTROUTE)
476 tos |= RTO_ONLINK;
477
478 if (MULTICAST(daddr)) {
479 if (!ipc.oif)
480 ipc.oif = inet->mc_index;
481 if (!saddr)
482 saddr = inet->mc_addr;
483 }
484
485 {
486 struct flowi fl = { .oif = ipc.oif,
487 .nl_u = { .ip4_u =
488 { .daddr = daddr,
489 .saddr = saddr,
490 .tos = tos } },
491 .proto = inet->hdrincl ? IPPROTO_RAW :
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900492 sk->sk_protocol,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 };
Heiko Carstensa27b58f2006-10-30 15:06:12 -0800494 if (!inet->hdrincl) {
495 err = raw_probe_proto_opt(&fl, msg);
496 if (err)
497 goto done;
498 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700500 security_sk_classify_flow(sk, &fl);
David S. Miller8eb90862007-02-08 02:09:21 -0800501 err = ip_route_output_flow(&rt, &fl, sk, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 }
503 if (err)
504 goto done;
505
506 err = -EACCES;
507 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
508 goto done;
509
510 if (msg->msg_flags & MSG_CONFIRM)
511 goto do_confirm;
512back_from_confirm:
513
514 if (inet->hdrincl)
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900515 err = raw_send_hdrinc(sk, msg->msg_iov, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 rt, msg->msg_flags);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900517
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 else {
519 if (!ipc.addr)
520 ipc.addr = rt->rt_dst;
521 lock_sock(sk);
522 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
523 &ipc, rt, msg->msg_flags);
524 if (err)
525 ip_flush_pending_frames(sk);
526 else if (!(msg->msg_flags & MSG_MORE))
527 err = ip_push_pending_frames(sk);
528 release_sock(sk);
529 }
530done:
531 if (free)
532 kfree(ipc.opt);
533 ip_rt_put(rt);
534
Jesper Juhl5418c692005-06-18 22:59:45 -0700535out:
536 if (err < 0)
537 return err;
538 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
540do_confirm:
541 dst_confirm(&rt->u.dst);
542 if (!(msg->msg_flags & MSG_PROBE) || len)
543 goto back_from_confirm;
544 err = 0;
545 goto done;
546}
547
548static void raw_close(struct sock *sk, long timeout)
549{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900550 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 * Raw sockets may have direct kernel refereneces. Kill them.
552 */
553 ip_ra_control(sk, 0, NULL);
554
555 sk_common_release(sk);
556}
557
558/* This gets rid of all the nasties in af_inet. -DaveM */
559static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
560{
561 struct inet_sock *inet = inet_sk(sk);
562 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
563 int ret = -EINVAL;
564 int chk_addr_ret;
565
566 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
567 goto out;
568 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
569 ret = -EADDRNOTAVAIL;
570 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
571 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
572 goto out;
573 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
574 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
575 inet->saddr = 0; /* Use device */
576 sk_dst_reset(sk);
577 ret = 0;
578out: return ret;
579}
580
581/*
582 * This should be easy, if there is something there
583 * we return it, otherwise we block.
584 */
585
586static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
587 size_t len, int noblock, int flags, int *addr_len)
588{
589 struct inet_sock *inet = inet_sk(sk);
590 size_t copied = 0;
591 int err = -EOPNOTSUPP;
592 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
593 struct sk_buff *skb;
594
595 if (flags & MSG_OOB)
596 goto out;
597
598 if (addr_len)
599 *addr_len = sizeof(*sin);
600
601 if (flags & MSG_ERRQUEUE) {
602 err = ip_recv_error(sk, msg, len);
603 goto out;
604 }
605
606 skb = skb_recv_datagram(sk, flags, noblock, &err);
607 if (!skb)
608 goto out;
609
610 copied = skb->len;
611 if (len < copied) {
612 msg->msg_flags |= MSG_TRUNC;
613 copied = len;
614 }
615
616 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
617 if (err)
618 goto done;
619
620 sock_recv_timestamp(msg, sk, skb);
621
622 /* Copy the address. */
623 if (sin) {
624 sin->sin_family = AF_INET;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700625 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Tetsuo Handaf59fc7f2006-07-25 17:05:35 -0700626 sin->sin_port = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
628 }
629 if (inet->cmsg_flags)
630 ip_cmsg_recv(msg, skb);
631 if (flags & MSG_TRUNC)
632 copied = skb->len;
633done:
634 skb_free_datagram(sk, skb);
Jesper Juhl5418c692005-06-18 22:59:45 -0700635out:
636 if (err)
637 return err;
638 return copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639}
640
641static int raw_init(struct sock *sk)
642{
643 struct raw_sock *rp = raw_sk(sk);
644
645 if (inet_sk(sk)->num == IPPROTO_ICMP)
646 memset(&rp->filter, 0, sizeof(rp->filter));
647 return 0;
648}
649
650static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
651{
652 if (optlen > sizeof(struct icmp_filter))
653 optlen = sizeof(struct icmp_filter);
654 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
655 return -EFAULT;
656 return 0;
657}
658
659static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
660{
661 int len, ret = -EFAULT;
662
663 if (get_user(len, optlen))
664 goto out;
665 ret = -EINVAL;
666 if (len < 0)
667 goto out;
668 if (len > sizeof(struct icmp_filter))
669 len = sizeof(struct icmp_filter);
670 ret = -EFAULT;
671 if (put_user(len, optlen) ||
672 copy_to_user(optval, &raw_sk(sk)->filter, len))
673 goto out;
674 ret = 0;
675out: return ret;
676}
677
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800678static int do_raw_setsockopt(struct sock *sk, int level, int optname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 char __user *optval, int optlen)
680{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 if (optname == ICMP_FILTER) {
682 if (inet_sk(sk)->num != IPPROTO_ICMP)
683 return -EOPNOTSUPP;
684 else
685 return raw_seticmpfilter(sk, optval, optlen);
686 }
687 return -ENOPROTOOPT;
688}
689
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800690static int raw_setsockopt(struct sock *sk, int level, int optname,
691 char __user *optval, int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692{
693 if (level != SOL_RAW)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800694 return ip_setsockopt(sk, level, optname, optval, optlen);
695 return do_raw_setsockopt(sk, level, optname, optval, optlen);
696}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800698#ifdef CONFIG_COMPAT
699static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800700 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800701{
702 if (level != SOL_RAW)
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800703 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800704 return do_raw_setsockopt(sk, level, optname, optval, optlen);
705}
706#endif
707
708static int do_raw_getsockopt(struct sock *sk, int level, int optname,
709 char __user *optval, int __user *optlen)
710{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 if (optname == ICMP_FILTER) {
712 if (inet_sk(sk)->num != IPPROTO_ICMP)
713 return -EOPNOTSUPP;
714 else
715 return raw_geticmpfilter(sk, optval, optlen);
716 }
717 return -ENOPROTOOPT;
718}
719
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800720static int raw_getsockopt(struct sock *sk, int level, int optname,
721 char __user *optval, int __user *optlen)
722{
723 if (level != SOL_RAW)
724 return ip_getsockopt(sk, level, optname, optval, optlen);
725 return do_raw_getsockopt(sk, level, optname, optval, optlen);
726}
727
728#ifdef CONFIG_COMPAT
729static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800730 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800731{
732 if (level != SOL_RAW)
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800733 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800734 return do_raw_getsockopt(sk, level, optname, optval, optlen);
735}
736#endif
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
739{
740 switch (cmd) {
741 case SIOCOUTQ: {
742 int amount = atomic_read(&sk->sk_wmem_alloc);
743 return put_user(amount, (int __user *)arg);
744 }
745 case SIOCINQ: {
746 struct sk_buff *skb;
747 int amount = 0;
748
Herbert Xue0f9f852005-06-18 22:56:18 -0700749 spin_lock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 skb = skb_peek(&sk->sk_receive_queue);
751 if (skb != NULL)
752 amount = skb->len;
Herbert Xue0f9f852005-06-18 22:56:18 -0700753 spin_unlock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 return put_user(amount, (int __user *)arg);
755 }
756
757 default:
758#ifdef CONFIG_IP_MROUTE
759 return ipmr_ioctl(sk, cmd, (void __user *)arg);
760#else
761 return -ENOIOCTLCMD;
762#endif
763 }
764}
765
Eric Dumazet47a31a62007-11-05 23:39:16 -0800766DEFINE_PROTO_INUSE(raw)
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768struct proto raw_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800769 .name = "RAW",
770 .owner = THIS_MODULE,
771 .close = raw_close,
772 .connect = ip4_datagram_connect,
773 .disconnect = udp_disconnect,
774 .ioctl = raw_ioctl,
775 .init = raw_init,
776 .setsockopt = raw_setsockopt,
777 .getsockopt = raw_getsockopt,
778 .sendmsg = raw_sendmsg,
779 .recvmsg = raw_recvmsg,
780 .bind = raw_bind,
781 .backlog_rcv = raw_rcv_skb,
782 .hash = raw_v4_hash,
783 .unhash = raw_v4_unhash,
784 .obj_size = sizeof(struct raw_sock),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800785#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800786 .compat_setsockopt = compat_raw_setsockopt,
787 .compat_getsockopt = compat_raw_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800788#endif
Eric Dumazet47a31a62007-11-05 23:39:16 -0800789 REF_PROTO_INUSE(raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790};
791
792#ifdef CONFIG_PROC_FS
793struct raw_iter_state {
794 int bucket;
795};
796
797#define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private)
798
799static struct sock *raw_get_first(struct seq_file *seq)
800{
801 struct sock *sk;
802 struct raw_iter_state* state = raw_seq_private(seq);
803
804 for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) {
805 struct hlist_node *node;
806
807 sk_for_each(sk, node, &raw_v4_htable[state->bucket])
808 if (sk->sk_family == PF_INET)
809 goto found;
810 }
811 sk = NULL;
812found:
813 return sk;
814}
815
816static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
817{
818 struct raw_iter_state* state = raw_seq_private(seq);
819
820 do {
821 sk = sk_next(sk);
822try_again:
823 ;
824 } while (sk && sk->sk_family != PF_INET);
825
826 if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) {
827 sk = sk_head(&raw_v4_htable[state->bucket]);
828 goto try_again;
829 }
830 return sk;
831}
832
833static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
834{
835 struct sock *sk = raw_get_first(seq);
836
837 if (sk)
838 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
839 --pos;
840 return pos ? NULL : sk;
841}
842
843static void *raw_seq_start(struct seq_file *seq, loff_t *pos)
844{
845 read_lock(&raw_v4_lock);
846 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
847}
848
849static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
850{
851 struct sock *sk;
852
853 if (v == SEQ_START_TOKEN)
854 sk = raw_get_first(seq);
855 else
856 sk = raw_get_next(seq, v);
857 ++*pos;
858 return sk;
859}
860
861static void raw_seq_stop(struct seq_file *seq, void *v)
862{
863 read_unlock(&raw_v4_lock);
864}
865
866static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i)
867{
868 struct inet_sock *inet = inet_sk(sp);
Al Viro714e85b2006-11-14 20:51:49 -0800869 __be32 dest = inet->daddr,
870 src = inet->rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 __u16 destp = 0,
872 srcp = inet->num;
873
874 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
Wang Chen33c732c2007-11-13 20:30:01 -0800875 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d",
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900876 i, src, srcp, dest, destp, sp->sk_state,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 atomic_read(&sp->sk_wmem_alloc),
878 atomic_read(&sp->sk_rmem_alloc),
879 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
Wang Chen33c732c2007-11-13 20:30:01 -0800880 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 return tmpbuf;
882}
883
Wang Chen33c732c2007-11-13 20:30:01 -0800884#define TMPSZ 128
885
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886static int raw_seq_show(struct seq_file *seq, void *v)
887{
Wang Chen33c732c2007-11-13 20:30:01 -0800888 char tmpbuf[TMPSZ+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 if (v == SEQ_START_TOKEN)
Wang Chen33c732c2007-11-13 20:30:01 -0800891 seq_printf(seq, "%-*s\n", TMPSZ-1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 " sl local_address rem_address st tx_queue "
893 "rx_queue tr tm->when retrnsmt uid timeout "
Wang Chen33c732c2007-11-13 20:30:01 -0800894 "inode drops");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 else {
896 struct raw_iter_state *state = raw_seq_private(seq);
897
Wang Chen33c732c2007-11-13 20:30:01 -0800898 seq_printf(seq, "%-*s\n", TMPSZ-1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 get_raw_sock(v, tmpbuf, state->bucket));
900 }
901 return 0;
902}
903
Stephen Hemmingerf6908082007-03-12 14:34:29 -0700904static const struct seq_operations raw_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 .start = raw_seq_start,
906 .next = raw_seq_next,
907 .stop = raw_seq_stop,
908 .show = raw_seq_show,
909};
910
911static int raw_seq_open(struct inode *inode, struct file *file)
912{
Pavel Emelyanovcf7732e2007-10-10 02:29:29 -0700913 return seq_open_private(file, &raw_seq_ops,
914 sizeof(struct raw_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915}
916
Arjan van de Ven9a321442007-02-12 00:55:35 -0800917static const struct file_operations raw_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 .owner = THIS_MODULE,
919 .open = raw_seq_open,
920 .read = seq_read,
921 .llseek = seq_lseek,
922 .release = seq_release_private,
923};
924
925int __init raw_proc_init(void)
926{
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200927 if (!proc_net_fops_create(&init_net, "raw", S_IRUGO, &raw_seq_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 return -ENOMEM;
929 return 0;
930}
931
932void __init raw_proc_exit(void)
933{
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200934 proc_net_remove(&init_net, "raw");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935}
936#endif /* CONFIG_PROC_FS */