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Commit | Line | Data |
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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/ip.h> | |
64 | #include <linux/net.h> | |
65 | #include <net/ip.h> | |
66 | #include <net/icmp.h> | |
67 | #include <net/udp.h> | |
68 | #include <net/raw.h> | |
69 | #include <net/snmp.h> | |
70 | #include <net/tcp_states.h> | |
71 | #include <net/inet_common.h> | |
72 | #include <net/checksum.h> | |
73 | #include <net/xfrm.h> | |
74 | #include <linux/rtnetlink.h> | |
75 | #include <linux/proc_fs.h> | |
76 | #include <linux/seq_file.h> | |
77 | #include <linux/netfilter.h> | |
78 | #include <linux/netfilter_ipv4.h> | |
79 | ||
80 | static struct raw_hashinfo raw_v4_hashinfo = { | |
81 | .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), | |
82 | }; | |
83 | ||
84 | void raw_hash_sk(struct sock *sk) | |
85 | { | |
86 | struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; | |
87 | struct hlist_head *head; | |
88 | ||
89 | head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; | |
90 | ||
91 | write_lock_bh(&h->lock); | |
92 | sk_add_node(sk, head); | |
93 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
94 | write_unlock_bh(&h->lock); | |
95 | } | |
96 | EXPORT_SYMBOL_GPL(raw_hash_sk); | |
97 | ||
98 | void raw_unhash_sk(struct sock *sk) | |
99 | { | |
100 | struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; | |
101 | ||
102 | write_lock_bh(&h->lock); | |
103 | if (sk_del_node_init(sk)) | |
104 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
105 | write_unlock_bh(&h->lock); | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(raw_unhash_sk); | |
108 | ||
109 | static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, | |
110 | unsigned short num, __be32 raddr, __be32 laddr, int dif) | |
111 | { | |
112 | struct hlist_node *node; | |
113 | ||
114 | sk_for_each_from(sk, node) { | |
115 | struct inet_sock *inet = inet_sk(sk); | |
116 | ||
117 | if (net_eq(sock_net(sk), net) && inet->inet_num == num && | |
118 | !(inet->inet_daddr && inet->inet_daddr != raddr) && | |
119 | !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && | |
120 | !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) | |
121 | goto found; /* gotcha */ | |
122 | } | |
123 | sk = NULL; | |
124 | found: | |
125 | return sk; | |
126 | } | |
127 | ||
128 | /* | |
129 | * 0 - deliver | |
130 | * 1 - block | |
131 | */ | |
132 | static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb) | |
133 | { | |
134 | int type; | |
135 | ||
136 | if (!pskb_may_pull(skb, sizeof(struct icmphdr))) | |
137 | return 1; | |
138 | ||
139 | type = icmp_hdr(skb)->type; | |
140 | if (type < 32) { | |
141 | __u32 data = raw_sk(sk)->filter.data; | |
142 | ||
143 | return ((1 << type) & data) != 0; | |
144 | } | |
145 | ||
146 | /* Do not block unknown ICMP types */ | |
147 | return 0; | |
148 | } | |
149 | ||
150 | /* IP input processing comes here for RAW socket delivery. | |
151 | * Caller owns SKB, so we must make clones. | |
152 | * | |
153 | * RFC 1122: SHOULD pass TOS value up to the transport layer. | |
154 | * -> It does. And not only TOS, but all IP header. | |
155 | */ | |
156 | static int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash) | |
157 | { | |
158 | struct sock *sk; | |
159 | struct hlist_head *head; | |
160 | int delivered = 0; | |
161 | struct net *net; | |
162 | ||
163 | read_lock(&raw_v4_hashinfo.lock); | |
164 | head = &raw_v4_hashinfo.ht[hash]; | |
165 | if (hlist_empty(head)) | |
166 | goto out; | |
167 | ||
168 | net = dev_net(skb->dev); | |
169 | sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, | |
170 | iph->saddr, iph->daddr, | |
171 | skb->dev->ifindex); | |
172 | ||
173 | while (sk) { | |
174 | delivered = 1; | |
175 | if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) { | |
176 | struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); | |
177 | ||
178 | /* Not releasing hash table! */ | |
179 | if (clone) | |
180 | raw_rcv(sk, clone); | |
181 | } | |
182 | sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, | |
183 | iph->saddr, iph->daddr, | |
184 | skb->dev->ifindex); | |
185 | } | |
186 | out: | |
187 | read_unlock(&raw_v4_hashinfo.lock); | |
188 | return delivered; | |
189 | } | |
190 | ||
191 | int raw_local_deliver(struct sk_buff *skb, int protocol) | |
192 | { | |
193 | int hash; | |
194 | struct sock *raw_sk; | |
195 | ||
196 | hash = protocol & (RAW_HTABLE_SIZE - 1); | |
197 | raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); | |
198 | ||
199 | /* If there maybe a raw socket we must check - if not we | |
200 | * don't care less | |
201 | */ | |
202 | if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash)) | |
203 | raw_sk = NULL; | |
204 | ||
205 | return raw_sk != NULL; | |
206 | ||
207 | } | |
208 | ||
209 | static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) | |
210 | { | |
211 | struct inet_sock *inet = inet_sk(sk); | |
212 | const int type = icmp_hdr(skb)->type; | |
213 | const int code = icmp_hdr(skb)->code; | |
214 | int err = 0; | |
215 | int harderr = 0; | |
216 | ||
217 | /* Report error on raw socket, if: | |
218 | 1. User requested ip_recverr. | |
219 | 2. Socket is connected (otherwise the error indication | |
220 | is useless without ip_recverr and error is hard. | |
221 | */ | |
222 | if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) | |
223 | return; | |
224 | ||
225 | switch (type) { | |
226 | default: | |
227 | case ICMP_TIME_EXCEEDED: | |
228 | err = EHOSTUNREACH; | |
229 | break; | |
230 | case ICMP_SOURCE_QUENCH: | |
231 | return; | |
232 | case ICMP_PARAMETERPROB: | |
233 | err = EPROTO; | |
234 | harderr = 1; | |
235 | break; | |
236 | case ICMP_DEST_UNREACH: | |
237 | err = EHOSTUNREACH; | |
238 | if (code > NR_ICMP_UNREACH) | |
239 | break; | |
240 | err = icmp_err_convert[code].errno; | |
241 | harderr = icmp_err_convert[code].fatal; | |
242 | if (code == ICMP_FRAG_NEEDED) { | |
243 | harderr = inet->pmtudisc != IP_PMTUDISC_DONT; | |
244 | err = EMSGSIZE; | |
245 | } | |
246 | } | |
247 | ||
248 | if (inet->recverr) { | |
249 | struct iphdr *iph = (struct iphdr *)skb->data; | |
250 | u8 *payload = skb->data + (iph->ihl << 2); | |
251 | ||
252 | if (inet->hdrincl) | |
253 | payload = skb->data; | |
254 | ip_icmp_error(sk, skb, err, 0, info, payload); | |
255 | } | |
256 | ||
257 | if (inet->recverr || harderr) { | |
258 | sk->sk_err = err; | |
259 | sk->sk_error_report(sk); | |
260 | } | |
261 | } | |
262 | ||
263 | void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) | |
264 | { | |
265 | int hash; | |
266 | struct sock *raw_sk; | |
267 | struct iphdr *iph; | |
268 | struct net *net; | |
269 | ||
270 | hash = protocol & (RAW_HTABLE_SIZE - 1); | |
271 | ||
272 | read_lock(&raw_v4_hashinfo.lock); | |
273 | raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); | |
274 | if (raw_sk != NULL) { | |
275 | iph = (struct iphdr *)skb->data; | |
276 | net = dev_net(skb->dev); | |
277 | ||
278 | while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, | |
279 | iph->daddr, iph->saddr, | |
280 | skb->dev->ifindex)) != NULL) { | |
281 | raw_err(raw_sk, skb, info); | |
282 | raw_sk = sk_next(raw_sk); | |
283 | iph = (struct iphdr *)skb->data; | |
284 | } | |
285 | } | |
286 | read_unlock(&raw_v4_hashinfo.lock); | |
287 | } | |
288 | ||
289 | static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) | |
290 | { | |
291 | /* Charge it to the socket. */ | |
292 | ||
293 | if (ip_queue_rcv_skb(sk, skb) < 0) { | |
294 | kfree_skb(skb); | |
295 | return NET_RX_DROP; | |
296 | } | |
297 | ||
298 | return NET_RX_SUCCESS; | |
299 | } | |
300 | ||
301 | int raw_rcv(struct sock *sk, struct sk_buff *skb) | |
302 | { | |
303 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { | |
304 | atomic_inc(&sk->sk_drops); | |
305 | kfree_skb(skb); | |
306 | return NET_RX_DROP; | |
307 | } | |
308 | nf_reset(skb); | |
309 | ||
310 | skb_push(skb, skb->data - skb_network_header(skb)); | |
311 | ||
312 | raw_rcv_skb(sk, skb); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static int raw_send_hdrinc(struct sock *sk, void *from, size_t length, | |
317 | struct rtable **rtp, | |
318 | unsigned int flags) | |
319 | { | |
320 | struct inet_sock *inet = inet_sk(sk); | |
321 | struct net *net = sock_net(sk); | |
322 | struct iphdr *iph; | |
323 | struct sk_buff *skb; | |
324 | unsigned int iphlen; | |
325 | int err; | |
326 | struct rtable *rt = *rtp; | |
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, &rt->u.dst); | |
346 | *rtp = NULL; | |
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 = -EFAULT; | |
356 | if (memcpy_fromiovecend((void *)iph, from, 0, length)) | |
357 | goto error_free; | |
358 | ||
359 | iphlen = iph->ihl * 4; | |
360 | ||
361 | /* | |
362 | * We don't want to modify the ip header, but we do need to | |
363 | * be sure that it won't cause problems later along the network | |
364 | * stack. Specifically we want to make sure that iph->ihl is a | |
365 | * sane value. If ihl points beyond the length of the buffer passed | |
366 | * in, reject the frame as invalid | |
367 | */ | |
368 | err = -EINVAL; | |
369 | if (iphlen > length) | |
370 | goto error_free; | |
371 | ||
372 | if (iphlen >= sizeof(*iph)) { | |
373 | if (!iph->saddr) | |
374 | iph->saddr = rt->rt_src; | |
375 | iph->check = 0; | |
376 | iph->tot_len = htons(length); | |
377 | if (!iph->id) | |
378 | ip_select_ident(iph, &rt->u.dst, NULL); | |
379 | ||
380 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
381 | } | |
382 | if (iph->protocol == IPPROTO_ICMP) | |
383 | icmp_out_count(net, ((struct icmphdr *) | |
384 | skb_transport_header(skb))->type); | |
385 | ||
386 | err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL, | |
387 | rt->u.dst.dev, dst_output); | |
388 | if (err > 0) | |
389 | err = net_xmit_errno(err); | |
390 | if (err) | |
391 | goto error; | |
392 | out: | |
393 | return 0; | |
394 | ||
395 | error_free: | |
396 | kfree_skb(skb); | |
397 | error: | |
398 | IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); | |
399 | if (err == -ENOBUFS && !inet->recverr) | |
400 | err = 0; | |
401 | return err; | |
402 | } | |
403 | ||
404 | static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) | |
405 | { | |
406 | struct iovec *iov; | |
407 | u8 __user *type = NULL; | |
408 | u8 __user *code = NULL; | |
409 | int probed = 0; | |
410 | unsigned int i; | |
411 | ||
412 | if (!msg->msg_iov) | |
413 | return 0; | |
414 | ||
415 | for (i = 0; i < msg->msg_iovlen; i++) { | |
416 | iov = &msg->msg_iov[i]; | |
417 | if (!iov) | |
418 | continue; | |
419 | ||
420 | switch (fl->proto) { | |
421 | case IPPROTO_ICMP: | |
422 | /* check if one-byte field is readable or not. */ | |
423 | if (iov->iov_base && iov->iov_len < 1) | |
424 | break; | |
425 | ||
426 | if (!type) { | |
427 | type = iov->iov_base; | |
428 | /* check if code field is readable or not. */ | |
429 | if (iov->iov_len > 1) | |
430 | code = type + 1; | |
431 | } else if (!code) | |
432 | code = iov->iov_base; | |
433 | ||
434 | if (type && code) { | |
435 | if (get_user(fl->fl_icmp_type, type) || | |
436 | get_user(fl->fl_icmp_code, code)) | |
437 | return -EFAULT; | |
438 | probed = 1; | |
439 | } | |
440 | break; | |
441 | default: | |
442 | probed = 1; | |
443 | break; | |
444 | } | |
445 | if (probed) | |
446 | break; | |
447 | } | |
448 | return 0; | |
449 | } | |
450 | ||
451 | static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
452 | size_t len) | |
453 | { | |
454 | struct inet_sock *inet = inet_sk(sk); | |
455 | struct ipcm_cookie ipc; | |
456 | struct rtable *rt = NULL; | |
457 | int free = 0; | |
458 | __be32 daddr; | |
459 | __be32 saddr; | |
460 | u8 tos; | |
461 | int err; | |
462 | ||
463 | err = -EMSGSIZE; | |
464 | if (len > 0xFFFF) | |
465 | goto out; | |
466 | ||
467 | /* | |
468 | * Check the flags. | |
469 | */ | |
470 | ||
471 | err = -EOPNOTSUPP; | |
472 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ | |
473 | goto out; /* compatibility */ | |
474 | ||
475 | /* | |
476 | * Get and verify the address. | |
477 | */ | |
478 | ||
479 | if (msg->msg_namelen) { | |
480 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; | |
481 | err = -EINVAL; | |
482 | if (msg->msg_namelen < sizeof(*usin)) | |
483 | goto out; | |
484 | if (usin->sin_family != AF_INET) { | |
485 | static int complained; | |
486 | if (!complained++) | |
487 | printk(KERN_INFO "%s forgot to set AF_INET in " | |
488 | "raw sendmsg. Fix it!\n", | |
489 | current->comm); | |
490 | err = -EAFNOSUPPORT; | |
491 | if (usin->sin_family) | |
492 | goto out; | |
493 | } | |
494 | daddr = usin->sin_addr.s_addr; | |
495 | /* ANK: I did not forget to get protocol from port field. | |
496 | * I just do not know, who uses this weirdness. | |
497 | * IP_HDRINCL is much more convenient. | |
498 | */ | |
499 | } else { | |
500 | err = -EDESTADDRREQ; | |
501 | if (sk->sk_state != TCP_ESTABLISHED) | |
502 | goto out; | |
503 | daddr = inet->inet_daddr; | |
504 | } | |
505 | ||
506 | ipc.addr = inet->inet_saddr; | |
507 | ipc.opt = NULL; | |
508 | ipc.shtx.flags = 0; | |
509 | ipc.oif = sk->sk_bound_dev_if; | |
510 | ||
511 | if (msg->msg_controllen) { | |
512 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); | |
513 | if (err) | |
514 | goto out; | |
515 | if (ipc.opt) | |
516 | free = 1; | |
517 | } | |
518 | ||
519 | saddr = ipc.addr; | |
520 | ipc.addr = daddr; | |
521 | ||
522 | if (!ipc.opt) | |
523 | ipc.opt = inet->opt; | |
524 | ||
525 | if (ipc.opt) { | |
526 | err = -EINVAL; | |
527 | /* Linux does not mangle headers on raw sockets, | |
528 | * so that IP options + IP_HDRINCL is non-sense. | |
529 | */ | |
530 | if (inet->hdrincl) | |
531 | goto done; | |
532 | if (ipc.opt->srr) { | |
533 | if (!daddr) | |
534 | goto done; | |
535 | daddr = ipc.opt->faddr; | |
536 | } | |
537 | } | |
538 | tos = RT_CONN_FLAGS(sk); | |
539 | if (msg->msg_flags & MSG_DONTROUTE) | |
540 | tos |= RTO_ONLINK; | |
541 | ||
542 | if (ipv4_is_multicast(daddr)) { | |
543 | if (!ipc.oif) | |
544 | ipc.oif = inet->mc_index; | |
545 | if (!saddr) | |
546 | saddr = inet->mc_addr; | |
547 | } | |
548 | ||
549 | { | |
550 | struct flowi fl = { .oif = ipc.oif, | |
551 | .mark = sk->sk_mark, | |
552 | .nl_u = { .ip4_u = | |
553 | { .daddr = daddr, | |
554 | .saddr = saddr, | |
555 | .tos = tos } }, | |
556 | .proto = inet->hdrincl ? IPPROTO_RAW : | |
557 | sk->sk_protocol, | |
558 | }; | |
559 | if (!inet->hdrincl) { | |
560 | err = raw_probe_proto_opt(&fl, msg); | |
561 | if (err) | |
562 | goto done; | |
563 | } | |
564 | ||
565 | security_sk_classify_flow(sk, &fl); | |
566 | err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 1); | |
567 | } | |
568 | if (err) | |
569 | goto done; | |
570 | ||
571 | err = -EACCES; | |
572 | if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) | |
573 | goto done; | |
574 | ||
575 | if (msg->msg_flags & MSG_CONFIRM) | |
576 | goto do_confirm; | |
577 | back_from_confirm: | |
578 | ||
579 | if (inet->hdrincl) | |
580 | err = raw_send_hdrinc(sk, msg->msg_iov, len, | |
581 | &rt, msg->msg_flags); | |
582 | ||
583 | else { | |
584 | if (!ipc.addr) | |
585 | ipc.addr = rt->rt_dst; | |
586 | lock_sock(sk); | |
587 | err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, | |
588 | &ipc, &rt, msg->msg_flags); | |
589 | if (err) | |
590 | ip_flush_pending_frames(sk); | |
591 | else if (!(msg->msg_flags & MSG_MORE)) { | |
592 | err = ip_push_pending_frames(sk); | |
593 | if (err == -ENOBUFS && !inet->recverr) | |
594 | err = 0; | |
595 | } | |
596 | release_sock(sk); | |
597 | } | |
598 | done: | |
599 | if (free) | |
600 | kfree(ipc.opt); | |
601 | ip_rt_put(rt); | |
602 | ||
603 | out: | |
604 | if (err < 0) | |
605 | return err; | |
606 | return len; | |
607 | ||
608 | do_confirm: | |
609 | dst_confirm(&rt->u.dst); | |
610 | if (!(msg->msg_flags & MSG_PROBE) || len) | |
611 | goto back_from_confirm; | |
612 | err = 0; | |
613 | goto done; | |
614 | } | |
615 | ||
616 | static void raw_close(struct sock *sk, long timeout) | |
617 | { | |
618 | /* | |
619 | * Raw sockets may have direct kernel refereneces. Kill them. | |
620 | */ | |
621 | ip_ra_control(sk, 0, NULL); | |
622 | ||
623 | sk_common_release(sk); | |
624 | } | |
625 | ||
626 | static void raw_destroy(struct sock *sk) | |
627 | { | |
628 | lock_sock(sk); | |
629 | ip_flush_pending_frames(sk); | |
630 | release_sock(sk); | |
631 | } | |
632 | ||
633 | /* This gets rid of all the nasties in af_inet. -DaveM */ | |
634 | static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
635 | { | |
636 | struct inet_sock *inet = inet_sk(sk); | |
637 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
638 | int ret = -EINVAL; | |
639 | int chk_addr_ret; | |
640 | ||
641 | if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) | |
642 | goto out; | |
643 | chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); | |
644 | ret = -EADDRNOTAVAIL; | |
645 | if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && | |
646 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) | |
647 | goto out; | |
648 | inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; | |
649 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
650 | inet->inet_saddr = 0; /* Use device */ | |
651 | sk_dst_reset(sk); | |
652 | ret = 0; | |
653 | out: return ret; | |
654 | } | |
655 | ||
656 | /* | |
657 | * This should be easy, if there is something there | |
658 | * we return it, otherwise we block. | |
659 | */ | |
660 | ||
661 | static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
662 | size_t len, int noblock, int flags, int *addr_len) | |
663 | { | |
664 | struct inet_sock *inet = inet_sk(sk); | |
665 | size_t copied = 0; | |
666 | int err = -EOPNOTSUPP; | |
667 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
668 | struct sk_buff *skb; | |
669 | ||
670 | if (flags & MSG_OOB) | |
671 | goto out; | |
672 | ||
673 | if (addr_len) | |
674 | *addr_len = sizeof(*sin); | |
675 | ||
676 | if (flags & MSG_ERRQUEUE) { | |
677 | err = ip_recv_error(sk, msg, len); | |
678 | goto out; | |
679 | } | |
680 | ||
681 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
682 | if (!skb) | |
683 | goto out; | |
684 | ||
685 | copied = skb->len; | |
686 | if (len < copied) { | |
687 | msg->msg_flags |= MSG_TRUNC; | |
688 | copied = len; | |
689 | } | |
690 | ||
691 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
692 | if (err) | |
693 | goto done; | |
694 | ||
695 | sock_recv_ts_and_drops(msg, sk, skb); | |
696 | ||
697 | /* Copy the address. */ | |
698 | if (sin) { | |
699 | sin->sin_family = AF_INET; | |
700 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
701 | sin->sin_port = 0; | |
702 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
703 | } | |
704 | if (inet->cmsg_flags) | |
705 | ip_cmsg_recv(msg, skb); | |
706 | if (flags & MSG_TRUNC) | |
707 | copied = skb->len; | |
708 | done: | |
709 | skb_free_datagram(sk, skb); | |
710 | out: | |
711 | if (err) | |
712 | return err; | |
713 | return copied; | |
714 | } | |
715 | ||
716 | static int raw_init(struct sock *sk) | |
717 | { | |
718 | struct raw_sock *rp = raw_sk(sk); | |
719 | ||
720 | if (inet_sk(sk)->inet_num == IPPROTO_ICMP) | |
721 | memset(&rp->filter, 0, sizeof(rp->filter)); | |
722 | return 0; | |
723 | } | |
724 | ||
725 | static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) | |
726 | { | |
727 | if (optlen > sizeof(struct icmp_filter)) | |
728 | optlen = sizeof(struct icmp_filter); | |
729 | if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) | |
730 | return -EFAULT; | |
731 | return 0; | |
732 | } | |
733 | ||
734 | static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) | |
735 | { | |
736 | int len, ret = -EFAULT; | |
737 | ||
738 | if (get_user(len, optlen)) | |
739 | goto out; | |
740 | ret = -EINVAL; | |
741 | if (len < 0) | |
742 | goto out; | |
743 | if (len > sizeof(struct icmp_filter)) | |
744 | len = sizeof(struct icmp_filter); | |
745 | ret = -EFAULT; | |
746 | if (put_user(len, optlen) || | |
747 | copy_to_user(optval, &raw_sk(sk)->filter, len)) | |
748 | goto out; | |
749 | ret = 0; | |
750 | out: return ret; | |
751 | } | |
752 | ||
753 | static int do_raw_setsockopt(struct sock *sk, int level, int optname, | |
754 | char __user *optval, unsigned int optlen) | |
755 | { | |
756 | if (optname == ICMP_FILTER) { | |
757 | if (inet_sk(sk)->inet_num != IPPROTO_ICMP) | |
758 | return -EOPNOTSUPP; | |
759 | else | |
760 | return raw_seticmpfilter(sk, optval, optlen); | |
761 | } | |
762 | return -ENOPROTOOPT; | |
763 | } | |
764 | ||
765 | static int raw_setsockopt(struct sock *sk, int level, int optname, | |
766 | char __user *optval, unsigned int optlen) | |
767 | { | |
768 | if (level != SOL_RAW) | |
769 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
770 | return do_raw_setsockopt(sk, level, optname, optval, optlen); | |
771 | } | |
772 | ||
773 | #ifdef CONFIG_COMPAT | |
774 | static int compat_raw_setsockopt(struct sock *sk, int level, int optname, | |
775 | char __user *optval, unsigned int optlen) | |
776 | { | |
777 | if (level != SOL_RAW) | |
778 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); | |
779 | return do_raw_setsockopt(sk, level, optname, optval, optlen); | |
780 | } | |
781 | #endif | |
782 | ||
783 | static int do_raw_getsockopt(struct sock *sk, int level, int optname, | |
784 | char __user *optval, int __user *optlen) | |
785 | { | |
786 | if (optname == ICMP_FILTER) { | |
787 | if (inet_sk(sk)->inet_num != IPPROTO_ICMP) | |
788 | return -EOPNOTSUPP; | |
789 | else | |
790 | return raw_geticmpfilter(sk, optval, optlen); | |
791 | } | |
792 | return -ENOPROTOOPT; | |
793 | } | |
794 | ||
795 | static int raw_getsockopt(struct sock *sk, int level, int optname, | |
796 | char __user *optval, int __user *optlen) | |
797 | { | |
798 | if (level != SOL_RAW) | |
799 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
800 | return do_raw_getsockopt(sk, level, optname, optval, optlen); | |
801 | } | |
802 | ||
803 | #ifdef CONFIG_COMPAT | |
804 | static int compat_raw_getsockopt(struct sock *sk, int level, int optname, | |
805 | char __user *optval, int __user *optlen) | |
806 | { | |
807 | if (level != SOL_RAW) | |
808 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); | |
809 | return do_raw_getsockopt(sk, level, optname, optval, optlen); | |
810 | } | |
811 | #endif | |
812 | ||
813 | static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
814 | { | |
815 | switch (cmd) { | |
816 | case SIOCOUTQ: { | |
817 | int amount = sk_wmem_alloc_get(sk); | |
818 | ||
819 | return put_user(amount, (int __user *)arg); | |
820 | } | |
821 | case SIOCINQ: { | |
822 | struct sk_buff *skb; | |
823 | int amount = 0; | |
824 | ||
825 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
826 | skb = skb_peek(&sk->sk_receive_queue); | |
827 | if (skb != NULL) | |
828 | amount = skb->len; | |
829 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
830 | return put_user(amount, (int __user *)arg); | |
831 | } | |
832 | ||
833 | default: | |
834 | #ifdef CONFIG_IP_MROUTE | |
835 | return ipmr_ioctl(sk, cmd, (void __user *)arg); | |
836 | #else | |
837 | return -ENOIOCTLCMD; | |
838 | #endif | |
839 | } | |
840 | } | |
841 | ||
842 | struct proto raw_prot = { | |
843 | .name = "RAW", | |
844 | .owner = THIS_MODULE, | |
845 | .close = raw_close, | |
846 | .destroy = raw_destroy, | |
847 | .connect = ip4_datagram_connect, | |
848 | .disconnect = udp_disconnect, | |
849 | .ioctl = raw_ioctl, | |
850 | .init = raw_init, | |
851 | .setsockopt = raw_setsockopt, | |
852 | .getsockopt = raw_getsockopt, | |
853 | .sendmsg = raw_sendmsg, | |
854 | .recvmsg = raw_recvmsg, | |
855 | .bind = raw_bind, | |
856 | .backlog_rcv = raw_rcv_skb, | |
857 | .hash = raw_hash_sk, | |
858 | .unhash = raw_unhash_sk, | |
859 | .obj_size = sizeof(struct raw_sock), | |
860 | .h.raw_hash = &raw_v4_hashinfo, | |
861 | #ifdef CONFIG_COMPAT | |
862 | .compat_setsockopt = compat_raw_setsockopt, | |
863 | .compat_getsockopt = compat_raw_getsockopt, | |
864 | #endif | |
865 | }; | |
866 | ||
867 | #ifdef CONFIG_PROC_FS | |
868 | static struct sock *raw_get_first(struct seq_file *seq) | |
869 | { | |
870 | struct sock *sk; | |
871 | struct raw_iter_state *state = raw_seq_private(seq); | |
872 | ||
873 | for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; | |
874 | ++state->bucket) { | |
875 | struct hlist_node *node; | |
876 | ||
877 | sk_for_each(sk, node, &state->h->ht[state->bucket]) | |
878 | if (sock_net(sk) == seq_file_net(seq)) | |
879 | goto found; | |
880 | } | |
881 | sk = NULL; | |
882 | found: | |
883 | return sk; | |
884 | } | |
885 | ||
886 | static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) | |
887 | { | |
888 | struct raw_iter_state *state = raw_seq_private(seq); | |
889 | ||
890 | do { | |
891 | sk = sk_next(sk); | |
892 | try_again: | |
893 | ; | |
894 | } while (sk && sock_net(sk) != seq_file_net(seq)); | |
895 | ||
896 | if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { | |
897 | sk = sk_head(&state->h->ht[state->bucket]); | |
898 | goto try_again; | |
899 | } | |
900 | return sk; | |
901 | } | |
902 | ||
903 | static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) | |
904 | { | |
905 | struct sock *sk = raw_get_first(seq); | |
906 | ||
907 | if (sk) | |
908 | while (pos && (sk = raw_get_next(seq, sk)) != NULL) | |
909 | --pos; | |
910 | return pos ? NULL : sk; | |
911 | } | |
912 | ||
913 | void *raw_seq_start(struct seq_file *seq, loff_t *pos) | |
914 | { | |
915 | struct raw_iter_state *state = raw_seq_private(seq); | |
916 | ||
917 | read_lock(&state->h->lock); | |
918 | return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
919 | } | |
920 | EXPORT_SYMBOL_GPL(raw_seq_start); | |
921 | ||
922 | void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
923 | { | |
924 | struct sock *sk; | |
925 | ||
926 | if (v == SEQ_START_TOKEN) | |
927 | sk = raw_get_first(seq); | |
928 | else | |
929 | sk = raw_get_next(seq, v); | |
930 | ++*pos; | |
931 | return sk; | |
932 | } | |
933 | EXPORT_SYMBOL_GPL(raw_seq_next); | |
934 | ||
935 | void raw_seq_stop(struct seq_file *seq, void *v) | |
936 | { | |
937 | struct raw_iter_state *state = raw_seq_private(seq); | |
938 | ||
939 | read_unlock(&state->h->lock); | |
940 | } | |
941 | EXPORT_SYMBOL_GPL(raw_seq_stop); | |
942 | ||
943 | static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) | |
944 | { | |
945 | struct inet_sock *inet = inet_sk(sp); | |
946 | __be32 dest = inet->inet_daddr, | |
947 | src = inet->inet_rcv_saddr; | |
948 | __u16 destp = 0, | |
949 | srcp = inet->inet_num; | |
950 | ||
951 | seq_printf(seq, "%4d: %08X:%04X %08X:%04X" | |
952 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", | |
953 | i, src, srcp, dest, destp, sp->sk_state, | |
954 | sk_wmem_alloc_get(sp), | |
955 | sk_rmem_alloc_get(sp), | |
956 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), | |
957 | atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); | |
958 | } | |
959 | ||
960 | static int raw_seq_show(struct seq_file *seq, void *v) | |
961 | { | |
962 | if (v == SEQ_START_TOKEN) | |
963 | seq_printf(seq, " sl local_address rem_address st tx_queue " | |
964 | "rx_queue tr tm->when retrnsmt uid timeout " | |
965 | "inode ref pointer drops\n"); | |
966 | else | |
967 | raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); | |
968 | return 0; | |
969 | } | |
970 | ||
971 | static const struct seq_operations raw_seq_ops = { | |
972 | .start = raw_seq_start, | |
973 | .next = raw_seq_next, | |
974 | .stop = raw_seq_stop, | |
975 | .show = raw_seq_show, | |
976 | }; | |
977 | ||
978 | int raw_seq_open(struct inode *ino, struct file *file, | |
979 | struct raw_hashinfo *h, const struct seq_operations *ops) | |
980 | { | |
981 | int err; | |
982 | struct raw_iter_state *i; | |
983 | ||
984 | err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); | |
985 | if (err < 0) | |
986 | return err; | |
987 | ||
988 | i = raw_seq_private((struct seq_file *)file->private_data); | |
989 | i->h = h; | |
990 | return 0; | |
991 | } | |
992 | EXPORT_SYMBOL_GPL(raw_seq_open); | |
993 | ||
994 | static int raw_v4_seq_open(struct inode *inode, struct file *file) | |
995 | { | |
996 | return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); | |
997 | } | |
998 | ||
999 | static const struct file_operations raw_seq_fops = { | |
1000 | .owner = THIS_MODULE, | |
1001 | .open = raw_v4_seq_open, | |
1002 | .read = seq_read, | |
1003 | .llseek = seq_lseek, | |
1004 | .release = seq_release_net, | |
1005 | }; | |
1006 | ||
1007 | static __net_init int raw_init_net(struct net *net) | |
1008 | { | |
1009 | if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops)) | |
1010 | return -ENOMEM; | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static __net_exit void raw_exit_net(struct net *net) | |
1016 | { | |
1017 | proc_net_remove(net, "raw"); | |
1018 | } | |
1019 | ||
1020 | static __net_initdata struct pernet_operations raw_net_ops = { | |
1021 | .init = raw_init_net, | |
1022 | .exit = raw_exit_net, | |
1023 | }; | |
1024 | ||
1025 | int __init raw_proc_init(void) | |
1026 | { | |
1027 | return register_pernet_subsys(&raw_net_ops); | |
1028 | } | |
1029 | ||
1030 | void __init raw_proc_exit(void) | |
1031 | { | |
1032 | unregister_pernet_subsys(&raw_net_ops); | |
1033 | } | |
1034 | #endif /* CONFIG_PROC_FS */ |