Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * RAW - implementation of IP "raw" sockets. | |
7 | * | |
8 | * Version: $Id: raw.c,v 1.64 2002/02/01 22:01:04 davem Exp $ | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * | |
13 | * Fixes: | |
14 | * Alan Cox : verify_area() fixed up | |
15 | * Alan Cox : ICMP error handling | |
16 | * Alan Cox : EMSGSIZE if you send too big a packet | |
17 | * Alan Cox : Now uses generic datagrams and shared | |
18 | * skbuff library. No more peek crashes, | |
19 | * no more backlogs | |
20 | * Alan Cox : Checks sk->broadcast. | |
21 | * Alan Cox : Uses skb_free_datagram/skb_copy_datagram | |
22 | * Alan Cox : Raw passes ip options too | |
23 | * Alan Cox : Setsocketopt added | |
24 | * Alan Cox : Fixed error return for broadcasts | |
25 | * Alan Cox : Removed wake_up calls | |
26 | * Alan Cox : Use ttl/tos | |
27 | * Alan Cox : Cleaned up old debugging | |
28 | * Alan Cox : Use new kernel side addresses | |
29 | * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. | |
30 | * Alan Cox : BSD style RAW socket demultiplexing. | |
31 | * Alan Cox : Beginnings of mrouted support. | |
32 | * Alan Cox : Added IP_HDRINCL option. | |
33 | * Alan Cox : Skip broadcast check if BSDism set. | |
34 | * David S. Miller : New socket lookup architecture. | |
35 | * | |
36 | * This program is free software; you can redistribute it and/or | |
37 | * modify it under the terms of the GNU General Public License | |
38 | * as published by the Free Software Foundation; either version | |
39 | * 2 of the License, or (at your option) any later version. | |
40 | */ | |
bf0d5249 | 41 | |
715b49ef | 42 | #include <linux/types.h> |
1da177e4 LT |
43 | #include <asm/atomic.h> |
44 | #include <asm/byteorder.h> | |
45 | #include <asm/current.h> | |
46 | #include <asm/uaccess.h> | |
47 | #include <asm/ioctls.h> | |
1da177e4 LT |
48 | #include <linux/stddef.h> |
49 | #include <linux/slab.h> | |
50 | #include <linux/errno.h> | |
51 | #include <linux/aio.h> | |
52 | #include <linux/kernel.h> | |
53 | #include <linux/spinlock.h> | |
54 | #include <linux/sockios.h> | |
55 | #include <linux/socket.h> | |
56 | #include <linux/in.h> | |
57 | #include <linux/mroute.h> | |
58 | #include <linux/netdevice.h> | |
59 | #include <linux/in_route.h> | |
60 | #include <linux/route.h> | |
1da177e4 LT |
61 | #include <linux/skbuff.h> |
62 | #include <net/dst.h> | |
63 | #include <net/sock.h> | |
64 | #include <linux/gfp.h> | |
65 | #include <linux/ip.h> | |
66 | #include <linux/net.h> | |
67 | #include <net/ip.h> | |
68 | #include <net/icmp.h> | |
69 | #include <net/udp.h> | |
70 | #include <net/raw.h> | |
71 | #include <net/snmp.h> | |
c752f073 | 72 | #include <net/tcp_states.h> |
1da177e4 LT |
73 | #include <net/inet_common.h> |
74 | #include <net/checksum.h> | |
75 | #include <net/xfrm.h> | |
76 | #include <linux/rtnetlink.h> | |
77 | #include <linux/proc_fs.h> | |
78 | #include <linux/seq_file.h> | |
79 | #include <linux/netfilter.h> | |
80 | #include <linux/netfilter_ipv4.h> | |
81 | ||
82 | struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE]; | |
83 | DEFINE_RWLOCK(raw_v4_lock); | |
84 | ||
85 | static void raw_v4_hash(struct sock *sk) | |
86 | { | |
87 | struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num & | |
88 | (RAWV4_HTABLE_SIZE - 1)]; | |
89 | ||
90 | write_lock_bh(&raw_v4_lock); | |
91 | sk_add_node(sk, head); | |
92 | sock_prot_inc_use(sk->sk_prot); | |
93 | write_unlock_bh(&raw_v4_lock); | |
94 | } | |
95 | ||
96 | static void raw_v4_unhash(struct sock *sk) | |
97 | { | |
e905a9ed | 98 | write_lock_bh(&raw_v4_lock); |
1da177e4 LT |
99 | if (sk_del_node_init(sk)) |
100 | sock_prot_dec_use(sk->sk_prot); | |
101 | write_unlock_bh(&raw_v4_lock); | |
102 | } | |
103 | ||
104 | struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num, | |
6d741653 | 105 | __be32 raddr, __be32 laddr, |
1da177e4 LT |
106 | int dif) |
107 | { | |
108 | struct hlist_node *node; | |
109 | ||
110 | sk_for_each_from(sk, node) { | |
111 | struct inet_sock *inet = inet_sk(sk); | |
112 | ||
113 | if (inet->num == num && | |
114 | !(inet->daddr && inet->daddr != raddr) && | |
115 | !(inet->rcv_saddr && inet->rcv_saddr != laddr) && | |
116 | !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) | |
117 | goto found; /* gotcha */ | |
118 | } | |
119 | sk = NULL; | |
120 | found: | |
121 | return sk; | |
122 | } | |
123 | ||
124 | /* | |
125 | * 0 - deliver | |
126 | * 1 - block | |
127 | */ | |
128 | static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb) | |
129 | { | |
130 | int type; | |
131 | ||
132 | if (!pskb_may_pull(skb, sizeof(struct icmphdr))) | |
133 | return 1; | |
134 | ||
88c7664f | 135 | type = icmp_hdr(skb)->type; |
1da177e4 LT |
136 | if (type < 32) { |
137 | __u32 data = raw_sk(sk)->filter.data; | |
138 | ||
139 | return ((1 << type) & data) != 0; | |
140 | } | |
141 | ||
142 | /* Do not block unknown ICMP types */ | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* IP input processing comes here for RAW socket delivery. | |
147 | * Caller owns SKB, so we must make clones. | |
148 | * | |
149 | * RFC 1122: SHOULD pass TOS value up to the transport layer. | |
150 | * -> It does. And not only TOS, but all IP header. | |
151 | */ | |
d13964f4 | 152 | int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash) |
1da177e4 LT |
153 | { |
154 | struct sock *sk; | |
155 | struct hlist_head *head; | |
d13964f4 | 156 | int delivered = 0; |
1da177e4 LT |
157 | |
158 | read_lock(&raw_v4_lock); | |
159 | head = &raw_v4_htable[hash]; | |
160 | if (hlist_empty(head)) | |
161 | goto out; | |
162 | sk = __raw_v4_lookup(__sk_head(head), iph->protocol, | |
163 | iph->saddr, iph->daddr, | |
164 | skb->dev->ifindex); | |
165 | ||
166 | while (sk) { | |
d13964f4 | 167 | delivered = 1; |
1da177e4 LT |
168 | if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) { |
169 | struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); | |
170 | ||
171 | /* Not releasing hash table! */ | |
172 | if (clone) | |
173 | raw_rcv(sk, clone); | |
174 | } | |
175 | sk = __raw_v4_lookup(sk_next(sk), iph->protocol, | |
176 | iph->saddr, iph->daddr, | |
177 | skb->dev->ifindex); | |
178 | } | |
179 | out: | |
180 | read_unlock(&raw_v4_lock); | |
d13964f4 | 181 | return delivered; |
1da177e4 LT |
182 | } |
183 | ||
184 | void raw_err (struct sock *sk, struct sk_buff *skb, u32 info) | |
185 | { | |
186 | struct inet_sock *inet = inet_sk(sk); | |
88c7664f ACM |
187 | const int type = icmp_hdr(skb)->type; |
188 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
189 | int err = 0; |
190 | int harderr = 0; | |
191 | ||
192 | /* Report error on raw socket, if: | |
193 | 1. User requested ip_recverr. | |
194 | 2. Socket is connected (otherwise the error indication | |
195 | is useless without ip_recverr and error is hard. | |
196 | */ | |
197 | if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) | |
198 | return; | |
199 | ||
200 | switch (type) { | |
201 | default: | |
202 | case ICMP_TIME_EXCEEDED: | |
203 | err = EHOSTUNREACH; | |
204 | break; | |
205 | case ICMP_SOURCE_QUENCH: | |
206 | return; | |
207 | case ICMP_PARAMETERPROB: | |
208 | err = EPROTO; | |
209 | harderr = 1; | |
210 | break; | |
211 | case ICMP_DEST_UNREACH: | |
212 | err = EHOSTUNREACH; | |
213 | if (code > NR_ICMP_UNREACH) | |
214 | break; | |
215 | err = icmp_err_convert[code].errno; | |
216 | harderr = icmp_err_convert[code].fatal; | |
217 | if (code == ICMP_FRAG_NEEDED) { | |
218 | harderr = inet->pmtudisc != IP_PMTUDISC_DONT; | |
219 | err = EMSGSIZE; | |
220 | } | |
221 | } | |
222 | ||
223 | if (inet->recverr) { | |
224 | struct iphdr *iph = (struct iphdr*)skb->data; | |
225 | u8 *payload = skb->data + (iph->ihl << 2); | |
226 | ||
227 | if (inet->hdrincl) | |
228 | payload = skb->data; | |
229 | ip_icmp_error(sk, skb, err, 0, info, payload); | |
230 | } | |
231 | ||
232 | if (inet->recverr || harderr) { | |
233 | sk->sk_err = err; | |
234 | sk->sk_error_report(sk); | |
235 | } | |
236 | } | |
237 | ||
238 | static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) | |
239 | { | |
240 | /* Charge it to the socket. */ | |
e905a9ed | 241 | |
1da177e4 LT |
242 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
243 | /* FIXME: increment a raw drops counter here */ | |
244 | kfree_skb(skb); | |
245 | return NET_RX_DROP; | |
246 | } | |
247 | ||
248 | return NET_RX_SUCCESS; | |
249 | } | |
250 | ||
251 | int raw_rcv(struct sock *sk, struct sk_buff *skb) | |
252 | { | |
253 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { | |
254 | kfree_skb(skb); | |
255 | return NET_RX_DROP; | |
256 | } | |
b59c2701 | 257 | nf_reset(skb); |
1da177e4 | 258 | |
d56f90a7 | 259 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
260 | |
261 | raw_rcv_skb(sk, skb); | |
262 | return 0; | |
263 | } | |
264 | ||
f7d7fc03 | 265 | static int raw_send_hdrinc(struct sock *sk, void *from, size_t length, |
e905a9ed | 266 | struct rtable *rt, |
1da177e4 LT |
267 | unsigned int flags) |
268 | { | |
269 | struct inet_sock *inet = inet_sk(sk); | |
270 | int hh_len; | |
271 | struct iphdr *iph; | |
272 | struct sk_buff *skb; | |
273 | int err; | |
274 | ||
275 | if (length > rt->u.dst.dev->mtu) { | |
276 | ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport, | |
277 | rt->u.dst.dev->mtu); | |
278 | return -EMSGSIZE; | |
279 | } | |
280 | if (flags&MSG_PROBE) | |
281 | goto out; | |
282 | ||
283 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); | |
284 | ||
285 | skb = sock_alloc_send_skb(sk, length+hh_len+15, | |
286 | flags&MSG_DONTWAIT, &err); | |
287 | if (skb == NULL) | |
e905a9ed | 288 | goto error; |
1da177e4 LT |
289 | skb_reserve(skb, hh_len); |
290 | ||
291 | skb->priority = sk->sk_priority; | |
292 | skb->dst = dst_clone(&rt->u.dst); | |
293 | ||
7e28ecc2 | 294 | skb_reset_network_header(skb); |
eddc9ec5 | 295 | iph = ip_hdr(skb); |
7e28ecc2 | 296 | skb_put(skb, length); |
1da177e4 LT |
297 | |
298 | skb->ip_summed = CHECKSUM_NONE; | |
299 | ||
b0e380b1 | 300 | skb->transport_header = skb->network_header; |
1da177e4 LT |
301 | err = memcpy_fromiovecend((void *)iph, from, 0, length); |
302 | if (err) | |
303 | goto error_fault; | |
304 | ||
305 | /* We don't modify invalid header */ | |
f7d7fc03 | 306 | if (length >= sizeof(*iph) && iph->ihl * 4U <= length) { |
1da177e4 LT |
307 | if (!iph->saddr) |
308 | iph->saddr = rt->rt_src; | |
309 | iph->check = 0; | |
310 | iph->tot_len = htons(length); | |
311 | if (!iph->id) | |
312 | ip_select_ident(iph, &rt->u.dst, NULL); | |
313 | ||
314 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
315 | } | |
316 | ||
317 | err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, | |
318 | dst_output); | |
319 | if (err > 0) | |
320 | err = inet->recverr ? net_xmit_errno(err) : 0; | |
321 | if (err) | |
322 | goto error; | |
323 | out: | |
324 | return 0; | |
325 | ||
326 | error_fault: | |
327 | err = -EFAULT; | |
328 | kfree_skb(skb); | |
329 | error: | |
330 | IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
e905a9ed | 331 | return err; |
1da177e4 LT |
332 | } |
333 | ||
a27b58fe | 334 | static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) |
1da177e4 LT |
335 | { |
336 | struct iovec *iov; | |
337 | u8 __user *type = NULL; | |
338 | u8 __user *code = NULL; | |
339 | int probed = 0; | |
93765d8a | 340 | unsigned int i; |
1da177e4 LT |
341 | |
342 | if (!msg->msg_iov) | |
a27b58fe | 343 | return 0; |
1da177e4 LT |
344 | |
345 | for (i = 0; i < msg->msg_iovlen; i++) { | |
346 | iov = &msg->msg_iov[i]; | |
347 | if (!iov) | |
348 | continue; | |
349 | ||
350 | switch (fl->proto) { | |
351 | case IPPROTO_ICMP: | |
352 | /* check if one-byte field is readable or not. */ | |
353 | if (iov->iov_base && iov->iov_len < 1) | |
354 | break; | |
355 | ||
356 | if (!type) { | |
357 | type = iov->iov_base; | |
358 | /* check if code field is readable or not. */ | |
359 | if (iov->iov_len > 1) | |
360 | code = type + 1; | |
361 | } else if (!code) | |
362 | code = iov->iov_base; | |
363 | ||
364 | if (type && code) { | |
a27b58fe HC |
365 | if (get_user(fl->fl_icmp_type, type) || |
366 | get_user(fl->fl_icmp_code, code)) | |
367 | return -EFAULT; | |
1da177e4 LT |
368 | probed = 1; |
369 | } | |
370 | break; | |
371 | default: | |
372 | probed = 1; | |
373 | break; | |
374 | } | |
375 | if (probed) | |
376 | break; | |
377 | } | |
a27b58fe | 378 | return 0; |
1da177e4 LT |
379 | } |
380 | ||
381 | static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
382 | size_t len) | |
383 | { | |
384 | struct inet_sock *inet = inet_sk(sk); | |
385 | struct ipcm_cookie ipc; | |
386 | struct rtable *rt = NULL; | |
387 | int free = 0; | |
3ca3c68e | 388 | __be32 daddr; |
c1d18f9f | 389 | __be32 saddr; |
1da177e4 LT |
390 | u8 tos; |
391 | int err; | |
392 | ||
393 | err = -EMSGSIZE; | |
926d4b81 | 394 | if (len > 0xFFFF) |
1da177e4 LT |
395 | goto out; |
396 | ||
397 | /* | |
398 | * Check the flags. | |
399 | */ | |
400 | ||
401 | err = -EOPNOTSUPP; | |
402 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ | |
403 | goto out; /* compatibility */ | |
e905a9ed | 404 | |
1da177e4 | 405 | /* |
e905a9ed | 406 | * Get and verify the address. |
1da177e4 LT |
407 | */ |
408 | ||
409 | if (msg->msg_namelen) { | |
410 | struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name; | |
411 | err = -EINVAL; | |
412 | if (msg->msg_namelen < sizeof(*usin)) | |
413 | goto out; | |
414 | if (usin->sin_family != AF_INET) { | |
415 | static int complained; | |
416 | if (!complained++) | |
417 | printk(KERN_INFO "%s forgot to set AF_INET in " | |
418 | "raw sendmsg. Fix it!\n", | |
419 | current->comm); | |
420 | err = -EAFNOSUPPORT; | |
421 | if (usin->sin_family) | |
422 | goto out; | |
423 | } | |
424 | daddr = usin->sin_addr.s_addr; | |
425 | /* ANK: I did not forget to get protocol from port field. | |
426 | * I just do not know, who uses this weirdness. | |
427 | * IP_HDRINCL is much more convenient. | |
428 | */ | |
429 | } else { | |
430 | err = -EDESTADDRREQ; | |
e905a9ed | 431 | if (sk->sk_state != TCP_ESTABLISHED) |
1da177e4 LT |
432 | goto out; |
433 | daddr = inet->daddr; | |
434 | } | |
435 | ||
436 | ipc.addr = inet->saddr; | |
437 | ipc.opt = NULL; | |
438 | ipc.oif = sk->sk_bound_dev_if; | |
439 | ||
440 | if (msg->msg_controllen) { | |
441 | err = ip_cmsg_send(msg, &ipc); | |
442 | if (err) | |
443 | goto out; | |
444 | if (ipc.opt) | |
445 | free = 1; | |
446 | } | |
447 | ||
448 | saddr = ipc.addr; | |
449 | ipc.addr = daddr; | |
450 | ||
451 | if (!ipc.opt) | |
452 | ipc.opt = inet->opt; | |
453 | ||
454 | if (ipc.opt) { | |
455 | err = -EINVAL; | |
456 | /* Linux does not mangle headers on raw sockets, | |
457 | * so that IP options + IP_HDRINCL is non-sense. | |
458 | */ | |
459 | if (inet->hdrincl) | |
460 | goto done; | |
461 | if (ipc.opt->srr) { | |
462 | if (!daddr) | |
463 | goto done; | |
464 | daddr = ipc.opt->faddr; | |
465 | } | |
466 | } | |
467 | tos = RT_CONN_FLAGS(sk); | |
468 | if (msg->msg_flags & MSG_DONTROUTE) | |
469 | tos |= RTO_ONLINK; | |
470 | ||
471 | if (MULTICAST(daddr)) { | |
472 | if (!ipc.oif) | |
473 | ipc.oif = inet->mc_index; | |
474 | if (!saddr) | |
475 | saddr = inet->mc_addr; | |
476 | } | |
477 | ||
478 | { | |
479 | struct flowi fl = { .oif = ipc.oif, | |
480 | .nl_u = { .ip4_u = | |
481 | { .daddr = daddr, | |
482 | .saddr = saddr, | |
483 | .tos = tos } }, | |
484 | .proto = inet->hdrincl ? IPPROTO_RAW : | |
e905a9ed | 485 | sk->sk_protocol, |
1da177e4 | 486 | }; |
a27b58fe HC |
487 | if (!inet->hdrincl) { |
488 | err = raw_probe_proto_opt(&fl, msg); | |
489 | if (err) | |
490 | goto done; | |
491 | } | |
1da177e4 | 492 | |
beb8d13b | 493 | security_sk_classify_flow(sk, &fl); |
8eb9086f | 494 | err = ip_route_output_flow(&rt, &fl, sk, 1); |
1da177e4 LT |
495 | } |
496 | if (err) | |
497 | goto done; | |
498 | ||
499 | err = -EACCES; | |
500 | if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) | |
501 | goto done; | |
502 | ||
503 | if (msg->msg_flags & MSG_CONFIRM) | |
504 | goto do_confirm; | |
505 | back_from_confirm: | |
506 | ||
507 | if (inet->hdrincl) | |
e905a9ed | 508 | err = raw_send_hdrinc(sk, msg->msg_iov, len, |
1da177e4 | 509 | rt, msg->msg_flags); |
e905a9ed | 510 | |
1da177e4 LT |
511 | else { |
512 | if (!ipc.addr) | |
513 | ipc.addr = rt->rt_dst; | |
514 | lock_sock(sk); | |
515 | err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, | |
516 | &ipc, rt, msg->msg_flags); | |
517 | if (err) | |
518 | ip_flush_pending_frames(sk); | |
519 | else if (!(msg->msg_flags & MSG_MORE)) | |
520 | err = ip_push_pending_frames(sk); | |
521 | release_sock(sk); | |
522 | } | |
523 | done: | |
524 | if (free) | |
525 | kfree(ipc.opt); | |
526 | ip_rt_put(rt); | |
527 | ||
5418c692 JJ |
528 | out: |
529 | if (err < 0) | |
530 | return err; | |
531 | return len; | |
1da177e4 LT |
532 | |
533 | do_confirm: | |
534 | dst_confirm(&rt->u.dst); | |
535 | if (!(msg->msg_flags & MSG_PROBE) || len) | |
536 | goto back_from_confirm; | |
537 | err = 0; | |
538 | goto done; | |
539 | } | |
540 | ||
541 | static void raw_close(struct sock *sk, long timeout) | |
542 | { | |
e905a9ed | 543 | /* |
1da177e4 LT |
544 | * Raw sockets may have direct kernel refereneces. Kill them. |
545 | */ | |
546 | ip_ra_control(sk, 0, NULL); | |
547 | ||
548 | sk_common_release(sk); | |
549 | } | |
550 | ||
551 | /* This gets rid of all the nasties in af_inet. -DaveM */ | |
552 | static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
553 | { | |
554 | struct inet_sock *inet = inet_sk(sk); | |
555 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
556 | int ret = -EINVAL; | |
557 | int chk_addr_ret; | |
558 | ||
559 | if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) | |
560 | goto out; | |
561 | chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); | |
562 | ret = -EADDRNOTAVAIL; | |
563 | if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && | |
564 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) | |
565 | goto out; | |
566 | inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; | |
567 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
568 | inet->saddr = 0; /* Use device */ | |
569 | sk_dst_reset(sk); | |
570 | ret = 0; | |
571 | out: return ret; | |
572 | } | |
573 | ||
574 | /* | |
575 | * This should be easy, if there is something there | |
576 | * we return it, otherwise we block. | |
577 | */ | |
578 | ||
579 | static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
580 | size_t len, int noblock, int flags, int *addr_len) | |
581 | { | |
582 | struct inet_sock *inet = inet_sk(sk); | |
583 | size_t copied = 0; | |
584 | int err = -EOPNOTSUPP; | |
585 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
586 | struct sk_buff *skb; | |
587 | ||
588 | if (flags & MSG_OOB) | |
589 | goto out; | |
590 | ||
591 | if (addr_len) | |
592 | *addr_len = sizeof(*sin); | |
593 | ||
594 | if (flags & MSG_ERRQUEUE) { | |
595 | err = ip_recv_error(sk, msg, len); | |
596 | goto out; | |
597 | } | |
598 | ||
599 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
600 | if (!skb) | |
601 | goto out; | |
602 | ||
603 | copied = skb->len; | |
604 | if (len < copied) { | |
605 | msg->msg_flags |= MSG_TRUNC; | |
606 | copied = len; | |
607 | } | |
608 | ||
609 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
610 | if (err) | |
611 | goto done; | |
612 | ||
613 | sock_recv_timestamp(msg, sk, skb); | |
614 | ||
615 | /* Copy the address. */ | |
616 | if (sin) { | |
617 | sin->sin_family = AF_INET; | |
eddc9ec5 | 618 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f59fc7f3 | 619 | sin->sin_port = 0; |
1da177e4 LT |
620 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
621 | } | |
622 | if (inet->cmsg_flags) | |
623 | ip_cmsg_recv(msg, skb); | |
624 | if (flags & MSG_TRUNC) | |
625 | copied = skb->len; | |
626 | done: | |
627 | skb_free_datagram(sk, skb); | |
5418c692 JJ |
628 | out: |
629 | if (err) | |
630 | return err; | |
631 | return copied; | |
1da177e4 LT |
632 | } |
633 | ||
634 | static int raw_init(struct sock *sk) | |
635 | { | |
636 | struct raw_sock *rp = raw_sk(sk); | |
637 | ||
638 | if (inet_sk(sk)->num == IPPROTO_ICMP) | |
639 | memset(&rp->filter, 0, sizeof(rp->filter)); | |
640 | return 0; | |
641 | } | |
642 | ||
643 | static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) | |
644 | { | |
645 | if (optlen > sizeof(struct icmp_filter)) | |
646 | optlen = sizeof(struct icmp_filter); | |
647 | if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) | |
648 | return -EFAULT; | |
649 | return 0; | |
650 | } | |
651 | ||
652 | static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) | |
653 | { | |
654 | int len, ret = -EFAULT; | |
655 | ||
656 | if (get_user(len, optlen)) | |
657 | goto out; | |
658 | ret = -EINVAL; | |
659 | if (len < 0) | |
660 | goto out; | |
661 | if (len > sizeof(struct icmp_filter)) | |
662 | len = sizeof(struct icmp_filter); | |
663 | ret = -EFAULT; | |
664 | if (put_user(len, optlen) || | |
665 | copy_to_user(optval, &raw_sk(sk)->filter, len)) | |
666 | goto out; | |
667 | ret = 0; | |
668 | out: return ret; | |
669 | } | |
670 | ||
3fdadf7d | 671 | static int do_raw_setsockopt(struct sock *sk, int level, int optname, |
1da177e4 LT |
672 | char __user *optval, int optlen) |
673 | { | |
1da177e4 LT |
674 | if (optname == ICMP_FILTER) { |
675 | if (inet_sk(sk)->num != IPPROTO_ICMP) | |
676 | return -EOPNOTSUPP; | |
677 | else | |
678 | return raw_seticmpfilter(sk, optval, optlen); | |
679 | } | |
680 | return -ENOPROTOOPT; | |
681 | } | |
682 | ||
3fdadf7d DM |
683 | static int raw_setsockopt(struct sock *sk, int level, int optname, |
684 | char __user *optval, int optlen) | |
1da177e4 LT |
685 | { |
686 | if (level != SOL_RAW) | |
3fdadf7d DM |
687 | return ip_setsockopt(sk, level, optname, optval, optlen); |
688 | return do_raw_setsockopt(sk, level, optname, optval, optlen); | |
689 | } | |
1da177e4 | 690 | |
3fdadf7d DM |
691 | #ifdef CONFIG_COMPAT |
692 | static int compat_raw_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 693 | char __user *optval, int optlen) |
3fdadf7d DM |
694 | { |
695 | if (level != SOL_RAW) | |
543d9cfe | 696 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
697 | return do_raw_setsockopt(sk, level, optname, optval, optlen); |
698 | } | |
699 | #endif | |
700 | ||
701 | static int do_raw_getsockopt(struct sock *sk, int level, int optname, | |
702 | char __user *optval, int __user *optlen) | |
703 | { | |
1da177e4 LT |
704 | if (optname == ICMP_FILTER) { |
705 | if (inet_sk(sk)->num != IPPROTO_ICMP) | |
706 | return -EOPNOTSUPP; | |
707 | else | |
708 | return raw_geticmpfilter(sk, optval, optlen); | |
709 | } | |
710 | return -ENOPROTOOPT; | |
711 | } | |
712 | ||
3fdadf7d DM |
713 | static int raw_getsockopt(struct sock *sk, int level, int optname, |
714 | char __user *optval, int __user *optlen) | |
715 | { | |
716 | if (level != SOL_RAW) | |
717 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
718 | return do_raw_getsockopt(sk, level, optname, optval, optlen); | |
719 | } | |
720 | ||
721 | #ifdef CONFIG_COMPAT | |
722 | static int compat_raw_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 723 | char __user *optval, int __user *optlen) |
3fdadf7d DM |
724 | { |
725 | if (level != SOL_RAW) | |
543d9cfe | 726 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
727 | return do_raw_getsockopt(sk, level, optname, optval, optlen); |
728 | } | |
729 | #endif | |
730 | ||
1da177e4 LT |
731 | static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) |
732 | { | |
733 | switch (cmd) { | |
734 | case SIOCOUTQ: { | |
735 | int amount = atomic_read(&sk->sk_wmem_alloc); | |
736 | return put_user(amount, (int __user *)arg); | |
737 | } | |
738 | case SIOCINQ: { | |
739 | struct sk_buff *skb; | |
740 | int amount = 0; | |
741 | ||
e0f9f858 | 742 | spin_lock_bh(&sk->sk_receive_queue.lock); |
1da177e4 LT |
743 | skb = skb_peek(&sk->sk_receive_queue); |
744 | if (skb != NULL) | |
745 | amount = skb->len; | |
e0f9f858 | 746 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
1da177e4 LT |
747 | return put_user(amount, (int __user *)arg); |
748 | } | |
749 | ||
750 | default: | |
751 | #ifdef CONFIG_IP_MROUTE | |
752 | return ipmr_ioctl(sk, cmd, (void __user *)arg); | |
753 | #else | |
754 | return -ENOIOCTLCMD; | |
755 | #endif | |
756 | } | |
757 | } | |
758 | ||
759 | struct proto raw_prot = { | |
543d9cfe ACM |
760 | .name = "RAW", |
761 | .owner = THIS_MODULE, | |
762 | .close = raw_close, | |
763 | .connect = ip4_datagram_connect, | |
764 | .disconnect = udp_disconnect, | |
765 | .ioctl = raw_ioctl, | |
766 | .init = raw_init, | |
767 | .setsockopt = raw_setsockopt, | |
768 | .getsockopt = raw_getsockopt, | |
769 | .sendmsg = raw_sendmsg, | |
770 | .recvmsg = raw_recvmsg, | |
771 | .bind = raw_bind, | |
772 | .backlog_rcv = raw_rcv_skb, | |
773 | .hash = raw_v4_hash, | |
774 | .unhash = raw_v4_unhash, | |
775 | .obj_size = sizeof(struct raw_sock), | |
3fdadf7d | 776 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
777 | .compat_setsockopt = compat_raw_setsockopt, |
778 | .compat_getsockopt = compat_raw_getsockopt, | |
3fdadf7d | 779 | #endif |
1da177e4 LT |
780 | }; |
781 | ||
782 | #ifdef CONFIG_PROC_FS | |
783 | struct raw_iter_state { | |
784 | int bucket; | |
785 | }; | |
786 | ||
787 | #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private) | |
788 | ||
789 | static struct sock *raw_get_first(struct seq_file *seq) | |
790 | { | |
791 | struct sock *sk; | |
792 | struct raw_iter_state* state = raw_seq_private(seq); | |
793 | ||
794 | for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) { | |
795 | struct hlist_node *node; | |
796 | ||
797 | sk_for_each(sk, node, &raw_v4_htable[state->bucket]) | |
798 | if (sk->sk_family == PF_INET) | |
799 | goto found; | |
800 | } | |
801 | sk = NULL; | |
802 | found: | |
803 | return sk; | |
804 | } | |
805 | ||
806 | static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) | |
807 | { | |
808 | struct raw_iter_state* state = raw_seq_private(seq); | |
809 | ||
810 | do { | |
811 | sk = sk_next(sk); | |
812 | try_again: | |
813 | ; | |
814 | } while (sk && sk->sk_family != PF_INET); | |
815 | ||
816 | if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) { | |
817 | sk = sk_head(&raw_v4_htable[state->bucket]); | |
818 | goto try_again; | |
819 | } | |
820 | return sk; | |
821 | } | |
822 | ||
823 | static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) | |
824 | { | |
825 | struct sock *sk = raw_get_first(seq); | |
826 | ||
827 | if (sk) | |
828 | while (pos && (sk = raw_get_next(seq, sk)) != NULL) | |
829 | --pos; | |
830 | return pos ? NULL : sk; | |
831 | } | |
832 | ||
833 | static void *raw_seq_start(struct seq_file *seq, loff_t *pos) | |
834 | { | |
835 | read_lock(&raw_v4_lock); | |
836 | return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
837 | } | |
838 | ||
839 | static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
840 | { | |
841 | struct sock *sk; | |
842 | ||
843 | if (v == SEQ_START_TOKEN) | |
844 | sk = raw_get_first(seq); | |
845 | else | |
846 | sk = raw_get_next(seq, v); | |
847 | ++*pos; | |
848 | return sk; | |
849 | } | |
850 | ||
851 | static void raw_seq_stop(struct seq_file *seq, void *v) | |
852 | { | |
853 | read_unlock(&raw_v4_lock); | |
854 | } | |
855 | ||
856 | static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i) | |
857 | { | |
858 | struct inet_sock *inet = inet_sk(sp); | |
714e85be AV |
859 | __be32 dest = inet->daddr, |
860 | src = inet->rcv_saddr; | |
1da177e4 LT |
861 | __u16 destp = 0, |
862 | srcp = inet->num; | |
863 | ||
864 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" | |
865 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", | |
e905a9ed | 866 | i, src, srcp, dest, destp, sp->sk_state, |
1da177e4 LT |
867 | atomic_read(&sp->sk_wmem_alloc), |
868 | atomic_read(&sp->sk_rmem_alloc), | |
869 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), | |
870 | atomic_read(&sp->sk_refcnt), sp); | |
871 | return tmpbuf; | |
872 | } | |
873 | ||
874 | static int raw_seq_show(struct seq_file *seq, void *v) | |
875 | { | |
876 | char tmpbuf[129]; | |
877 | ||
878 | if (v == SEQ_START_TOKEN) | |
879 | seq_printf(seq, "%-127s\n", | |
880 | " sl local_address rem_address st tx_queue " | |
881 | "rx_queue tr tm->when retrnsmt uid timeout " | |
882 | "inode"); | |
883 | else { | |
884 | struct raw_iter_state *state = raw_seq_private(seq); | |
885 | ||
886 | seq_printf(seq, "%-127s\n", | |
887 | get_raw_sock(v, tmpbuf, state->bucket)); | |
888 | } | |
889 | return 0; | |
890 | } | |
891 | ||
f690808e | 892 | static const struct seq_operations raw_seq_ops = { |
1da177e4 LT |
893 | .start = raw_seq_start, |
894 | .next = raw_seq_next, | |
895 | .stop = raw_seq_stop, | |
896 | .show = raw_seq_show, | |
897 | }; | |
898 | ||
899 | static int raw_seq_open(struct inode *inode, struct file *file) | |
900 | { | |
901 | struct seq_file *seq; | |
902 | int rc = -ENOMEM; | |
4487b2f6 | 903 | struct raw_iter_state *s; |
1da177e4 | 904 | |
4487b2f6 | 905 | s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
906 | if (!s) |
907 | goto out; | |
908 | rc = seq_open(file, &raw_seq_ops); | |
909 | if (rc) | |
910 | goto out_kfree; | |
911 | ||
912 | seq = file->private_data; | |
913 | seq->private = s; | |
1da177e4 LT |
914 | out: |
915 | return rc; | |
916 | out_kfree: | |
917 | kfree(s); | |
918 | goto out; | |
919 | } | |
920 | ||
9a32144e | 921 | static const struct file_operations raw_seq_fops = { |
1da177e4 LT |
922 | .owner = THIS_MODULE, |
923 | .open = raw_seq_open, | |
924 | .read = seq_read, | |
925 | .llseek = seq_lseek, | |
926 | .release = seq_release_private, | |
927 | }; | |
928 | ||
929 | int __init raw_proc_init(void) | |
930 | { | |
931 | if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops)) | |
932 | return -ENOMEM; | |
933 | return 0; | |
934 | } | |
935 | ||
936 | void __init raw_proc_exit(void) | |
937 | { | |
938 | proc_net_remove("raw"); | |
939 | } | |
940 | #endif /* CONFIG_PROC_FS */ |