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Commit | Line | Data |
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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 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
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 | */ | |
bf0d5249 | 39 | |
715b49ef | 40 | #include <linux/types.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
1da177e4 | 59 | #include <linux/skbuff.h> |
457c4cbc | 60 | #include <net/net_namespace.h> |
1da177e4 LT |
61 | #include <net/dst.h> |
62 | #include <net/sock.h> | |
1da177e4 LT |
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> | |
c752f073 | 70 | #include <net/tcp_states.h> |
1da177e4 LT |
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 | ||
b673e4df | 80 | static struct raw_hashinfo raw_v4_hashinfo = { |
938b93ad | 81 | .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), |
b673e4df | 82 | }; |
1da177e4 | 83 | |
fc8717ba | 84 | void raw_hash_sk(struct sock *sk) |
1da177e4 | 85 | { |
fc8717ba | 86 | struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; |
65b4c50b | 87 | struct hlist_head *head; |
1da177e4 | 88 | |
c720c7e8 | 89 | head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; |
65b4c50b PE |
90 | |
91 | write_lock_bh(&h->lock); | |
1da177e4 | 92 | sk_add_node(sk, head); |
c29a0bc4 | 93 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
65b4c50b PE |
94 | write_unlock_bh(&h->lock); |
95 | } | |
96 | EXPORT_SYMBOL_GPL(raw_hash_sk); | |
97 | ||
fc8717ba | 98 | void raw_unhash_sk(struct sock *sk) |
ab70768e | 99 | { |
fc8717ba PE |
100 | struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; |
101 | ||
ab70768e PE |
102 | write_lock_bh(&h->lock); |
103 | if (sk_del_node_init(sk)) | |
c29a0bc4 | 104 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
ab70768e PE |
105 | write_unlock_bh(&h->lock); |
106 | } | |
107 | EXPORT_SYMBOL_GPL(raw_unhash_sk); | |
108 | ||
be185884 PE |
109 | static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, |
110 | unsigned short num, __be32 raddr, __be32 laddr, int dif) | |
1da177e4 LT |
111 | { |
112 | struct hlist_node *node; | |
113 | ||
114 | sk_for_each_from(sk, node) { | |
115 | struct inet_sock *inet = inet_sk(sk); | |
116 | ||
c720c7e8 ED |
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) && | |
1da177e4 LT |
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 | ||
88c7664f | 139 | type = icmp_hdr(skb)->type; |
1da177e4 LT |
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 | */ | |
7bc54c90 | 156 | static int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash) |
1da177e4 LT |
157 | { |
158 | struct sock *sk; | |
159 | struct hlist_head *head; | |
d13964f4 | 160 | int delivered = 0; |
be185884 | 161 | struct net *net; |
1da177e4 | 162 | |
b673e4df PE |
163 | read_lock(&raw_v4_hashinfo.lock); |
164 | head = &raw_v4_hashinfo.ht[hash]; | |
1da177e4 LT |
165 | if (hlist_empty(head)) |
166 | goto out; | |
be185884 | 167 | |
c346dca1 | 168 | net = dev_net(skb->dev); |
be185884 | 169 | sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, |
1da177e4 LT |
170 | iph->saddr, iph->daddr, |
171 | skb->dev->ifindex); | |
172 | ||
173 | while (sk) { | |
d13964f4 | 174 | delivered = 1; |
1da177e4 LT |
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 | } | |
be185884 | 182 | sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, |
1da177e4 LT |
183 | iph->saddr, iph->daddr, |
184 | skb->dev->ifindex); | |
185 | } | |
186 | out: | |
b673e4df | 187 | read_unlock(&raw_v4_hashinfo.lock); |
d13964f4 | 188 | return delivered; |
1da177e4 LT |
189 | } |
190 | ||
7bc54c90 PE |
191 | int raw_local_deliver(struct sk_buff *skb, int protocol) |
192 | { | |
193 | int hash; | |
194 | struct sock *raw_sk; | |
195 | ||
b673e4df PE |
196 | hash = protocol & (RAW_HTABLE_SIZE - 1); |
197 | raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); | |
7bc54c90 PE |
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) | |
1da177e4 LT |
210 | { |
211 | struct inet_sock *inet = inet_sk(sk); | |
88c7664f ACM |
212 | const int type = icmp_hdr(skb)->type; |
213 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
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) { | |
5a5f3a8d | 249 | struct iphdr *iph = (struct iphdr *)skb->data; |
1da177e4 LT |
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 | ||
7bc54c90 PE |
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; | |
be185884 | 268 | struct net *net; |
7bc54c90 | 269 | |
b673e4df | 270 | hash = protocol & (RAW_HTABLE_SIZE - 1); |
7bc54c90 | 271 | |
b673e4df PE |
272 | read_lock(&raw_v4_hashinfo.lock); |
273 | raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); | |
7bc54c90 PE |
274 | if (raw_sk != NULL) { |
275 | iph = (struct iphdr *)skb->data; | |
c346dca1 | 276 | net = dev_net(skb->dev); |
be185884 PE |
277 | |
278 | while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, | |
279 | iph->daddr, iph->saddr, | |
7bc54c90 PE |
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 | } | |
b673e4df | 286 | read_unlock(&raw_v4_hashinfo.lock); |
7bc54c90 PE |
287 | } |
288 | ||
1da177e4 LT |
289 | static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) |
290 | { | |
291 | /* Charge it to the socket. */ | |
e905a9ed | 292 | |
f84af32c | 293 | if (ip_queue_rcv_skb(sk, skb) < 0) { |
1da177e4 LT |
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)) { | |
33c732c3 | 304 | atomic_inc(&sk->sk_drops); |
1da177e4 LT |
305 | kfree_skb(skb); |
306 | return NET_RX_DROP; | |
307 | } | |
b59c2701 | 308 | nf_reset(skb); |
1da177e4 | 309 | |
d56f90a7 | 310 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
311 | |
312 | raw_rcv_skb(sk, skb); | |
313 | return 0; | |
314 | } | |
315 | ||
f7d7fc03 | 316 | static int raw_send_hdrinc(struct sock *sk, void *from, size_t length, |
e905a9ed | 317 | struct rtable *rt, |
1da177e4 LT |
318 | unsigned int flags) |
319 | { | |
320 | struct inet_sock *inet = inet_sk(sk); | |
0388b004 | 321 | struct net *net = sock_net(sk); |
1da177e4 LT |
322 | struct iphdr *iph; |
323 | struct sk_buff *skb; | |
f844c74f | 324 | unsigned int iphlen; |
1da177e4 LT |
325 | int err; |
326 | ||
327 | if (length > rt->u.dst.dev->mtu) { | |
c720c7e8 | 328 | ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->inet_dport, |
1da177e4 LT |
329 | rt->u.dst.dev->mtu); |
330 | return -EMSGSIZE; | |
331 | } | |
332 | if (flags&MSG_PROBE) | |
333 | goto out; | |
334 | ||
f5184d26 JB |
335 | skb = sock_alloc_send_skb(sk, |
336 | length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15, | |
337 | flags & MSG_DONTWAIT, &err); | |
1da177e4 | 338 | if (skb == NULL) |
e905a9ed | 339 | goto error; |
f5184d26 | 340 | skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev)); |
1da177e4 LT |
341 | |
342 | skb->priority = sk->sk_priority; | |
4a19ec58 | 343 | skb->mark = sk->sk_mark; |
adf30907 | 344 | skb_dst_set(skb, dst_clone(&rt->u.dst)); |
1da177e4 | 345 | |
7e28ecc2 | 346 | skb_reset_network_header(skb); |
eddc9ec5 | 347 | iph = ip_hdr(skb); |
7e28ecc2 | 348 | skb_put(skb, length); |
1da177e4 LT |
349 | |
350 | skb->ip_summed = CHECKSUM_NONE; | |
351 | ||
b0e380b1 | 352 | skb->transport_header = skb->network_header; |
55888dfb NH |
353 | err = -EFAULT; |
354 | if (memcpy_fromiovecend((void *)iph, from, 0, length)) | |
355 | goto error_free; | |
1da177e4 | 356 | |
f844c74f | 357 | iphlen = iph->ihl * 4; |
55888dfb NH |
358 | |
359 | /* | |
360 | * We don't want to modify the ip header, but we do need to | |
361 | * be sure that it won't cause problems later along the network | |
362 | * stack. Specifically we want to make sure that iph->ihl is a | |
363 | * sane value. If ihl points beyond the length of the buffer passed | |
364 | * in, reject the frame as invalid | |
365 | */ | |
366 | err = -EINVAL; | |
367 | if (iphlen > length) | |
368 | goto error_free; | |
369 | ||
370 | if (iphlen >= sizeof(*iph)) { | |
1da177e4 LT |
371 | if (!iph->saddr) |
372 | iph->saddr = rt->rt_src; | |
373 | iph->check = 0; | |
374 | iph->tot_len = htons(length); | |
375 | if (!iph->id) | |
376 | ip_select_ident(iph, &rt->u.dst, NULL); | |
377 | ||
378 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
379 | } | |
96793b48 | 380 | if (iph->protocol == IPPROTO_ICMP) |
0388b004 | 381 | icmp_out_count(net, ((struct icmphdr *) |
96793b48 | 382 | skb_transport_header(skb))->type); |
1da177e4 | 383 | |
9bbc768a JE |
384 | err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL, |
385 | rt->u.dst.dev, dst_output); | |
1da177e4 | 386 | if (err > 0) |
6ce9e7b5 | 387 | err = net_xmit_errno(err); |
1da177e4 LT |
388 | if (err) |
389 | goto error; | |
390 | out: | |
391 | return 0; | |
392 | ||
55888dfb | 393 | error_free: |
1da177e4 LT |
394 | kfree_skb(skb); |
395 | error: | |
5e38e270 | 396 | IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); |
6ce9e7b5 ED |
397 | if (err == -ENOBUFS && !inet->recverr) |
398 | err = 0; | |
e905a9ed | 399 | return err; |
1da177e4 LT |
400 | } |
401 | ||
a27b58fe | 402 | static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) |
1da177e4 LT |
403 | { |
404 | struct iovec *iov; | |
405 | u8 __user *type = NULL; | |
406 | u8 __user *code = NULL; | |
407 | int probed = 0; | |
93765d8a | 408 | unsigned int i; |
1da177e4 LT |
409 | |
410 | if (!msg->msg_iov) | |
a27b58fe | 411 | return 0; |
1da177e4 LT |
412 | |
413 | for (i = 0; i < msg->msg_iovlen; i++) { | |
414 | iov = &msg->msg_iov[i]; | |
415 | if (!iov) | |
416 | continue; | |
417 | ||
418 | switch (fl->proto) { | |
419 | case IPPROTO_ICMP: | |
420 | /* check if one-byte field is readable or not. */ | |
421 | if (iov->iov_base && iov->iov_len < 1) | |
422 | break; | |
423 | ||
424 | if (!type) { | |
425 | type = iov->iov_base; | |
426 | /* check if code field is readable or not. */ | |
427 | if (iov->iov_len > 1) | |
428 | code = type + 1; | |
429 | } else if (!code) | |
430 | code = iov->iov_base; | |
431 | ||
432 | if (type && code) { | |
a27b58fe HC |
433 | if (get_user(fl->fl_icmp_type, type) || |
434 | get_user(fl->fl_icmp_code, code)) | |
435 | return -EFAULT; | |
1da177e4 LT |
436 | probed = 1; |
437 | } | |
438 | break; | |
439 | default: | |
440 | probed = 1; | |
441 | break; | |
442 | } | |
443 | if (probed) | |
444 | break; | |
445 | } | |
a27b58fe | 446 | return 0; |
1da177e4 LT |
447 | } |
448 | ||
449 | static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
450 | size_t len) | |
451 | { | |
452 | struct inet_sock *inet = inet_sk(sk); | |
453 | struct ipcm_cookie ipc; | |
454 | struct rtable *rt = NULL; | |
455 | int free = 0; | |
3ca3c68e | 456 | __be32 daddr; |
c1d18f9f | 457 | __be32 saddr; |
1da177e4 LT |
458 | u8 tos; |
459 | int err; | |
460 | ||
461 | err = -EMSGSIZE; | |
926d4b81 | 462 | if (len > 0xFFFF) |
1da177e4 LT |
463 | goto out; |
464 | ||
465 | /* | |
466 | * Check the flags. | |
467 | */ | |
468 | ||
469 | err = -EOPNOTSUPP; | |
470 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ | |
471 | goto out; /* compatibility */ | |
e905a9ed | 472 | |
1da177e4 | 473 | /* |
e905a9ed | 474 | * Get and verify the address. |
1da177e4 LT |
475 | */ |
476 | ||
477 | if (msg->msg_namelen) { | |
5a5f3a8d | 478 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; |
1da177e4 LT |
479 | err = -EINVAL; |
480 | if (msg->msg_namelen < sizeof(*usin)) | |
481 | goto out; | |
482 | if (usin->sin_family != AF_INET) { | |
483 | static int complained; | |
484 | if (!complained++) | |
485 | printk(KERN_INFO "%s forgot to set AF_INET in " | |
486 | "raw sendmsg. Fix it!\n", | |
487 | current->comm); | |
488 | err = -EAFNOSUPPORT; | |
489 | if (usin->sin_family) | |
490 | goto out; | |
491 | } | |
492 | daddr = usin->sin_addr.s_addr; | |
493 | /* ANK: I did not forget to get protocol from port field. | |
494 | * I just do not know, who uses this weirdness. | |
495 | * IP_HDRINCL is much more convenient. | |
496 | */ | |
497 | } else { | |
498 | err = -EDESTADDRREQ; | |
e905a9ed | 499 | if (sk->sk_state != TCP_ESTABLISHED) |
1da177e4 | 500 | goto out; |
c720c7e8 | 501 | daddr = inet->inet_daddr; |
1da177e4 LT |
502 | } |
503 | ||
c720c7e8 | 504 | ipc.addr = inet->inet_saddr; |
1da177e4 | 505 | ipc.opt = NULL; |
51f31cab | 506 | ipc.shtx.flags = 0; |
1da177e4 LT |
507 | ipc.oif = sk->sk_bound_dev_if; |
508 | ||
509 | if (msg->msg_controllen) { | |
3b1e0a65 | 510 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
1da177e4 LT |
511 | if (err) |
512 | goto out; | |
513 | if (ipc.opt) | |
514 | free = 1; | |
515 | } | |
516 | ||
517 | saddr = ipc.addr; | |
518 | ipc.addr = daddr; | |
519 | ||
520 | if (!ipc.opt) | |
521 | ipc.opt = inet->opt; | |
522 | ||
523 | if (ipc.opt) { | |
524 | err = -EINVAL; | |
525 | /* Linux does not mangle headers on raw sockets, | |
526 | * so that IP options + IP_HDRINCL is non-sense. | |
527 | */ | |
528 | if (inet->hdrincl) | |
529 | goto done; | |
530 | if (ipc.opt->srr) { | |
531 | if (!daddr) | |
532 | goto done; | |
533 | daddr = ipc.opt->faddr; | |
534 | } | |
535 | } | |
536 | tos = RT_CONN_FLAGS(sk); | |
537 | if (msg->msg_flags & MSG_DONTROUTE) | |
538 | tos |= RTO_ONLINK; | |
539 | ||
f97c1e0c | 540 | if (ipv4_is_multicast(daddr)) { |
1da177e4 LT |
541 | if (!ipc.oif) |
542 | ipc.oif = inet->mc_index; | |
543 | if (!saddr) | |
544 | saddr = inet->mc_addr; | |
545 | } | |
546 | ||
547 | { | |
548 | struct flowi fl = { .oif = ipc.oif, | |
4a19ec58 | 549 | .mark = sk->sk_mark, |
1da177e4 LT |
550 | .nl_u = { .ip4_u = |
551 | { .daddr = daddr, | |
552 | .saddr = saddr, | |
553 | .tos = tos } }, | |
554 | .proto = inet->hdrincl ? IPPROTO_RAW : | |
e905a9ed | 555 | sk->sk_protocol, |
1da177e4 | 556 | }; |
a27b58fe HC |
557 | if (!inet->hdrincl) { |
558 | err = raw_probe_proto_opt(&fl, msg); | |
559 | if (err) | |
560 | goto done; | |
561 | } | |
1da177e4 | 562 | |
beb8d13b | 563 | security_sk_classify_flow(sk, &fl); |
3b1e0a65 | 564 | err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 1); |
1da177e4 LT |
565 | } |
566 | if (err) | |
567 | goto done; | |
568 | ||
569 | err = -EACCES; | |
570 | if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) | |
571 | goto done; | |
572 | ||
573 | if (msg->msg_flags & MSG_CONFIRM) | |
574 | goto do_confirm; | |
575 | back_from_confirm: | |
576 | ||
577 | if (inet->hdrincl) | |
e905a9ed | 578 | err = raw_send_hdrinc(sk, msg->msg_iov, len, |
1da177e4 | 579 | rt, msg->msg_flags); |
e905a9ed | 580 | |
1da177e4 LT |
581 | else { |
582 | if (!ipc.addr) | |
583 | ipc.addr = rt->rt_dst; | |
584 | lock_sock(sk); | |
585 | err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, | |
2e77d89b | 586 | &ipc, &rt, msg->msg_flags); |
1da177e4 LT |
587 | if (err) |
588 | ip_flush_pending_frames(sk); | |
6ce9e7b5 | 589 | else if (!(msg->msg_flags & MSG_MORE)) { |
1da177e4 | 590 | err = ip_push_pending_frames(sk); |
6ce9e7b5 ED |
591 | if (err == -ENOBUFS && !inet->recverr) |
592 | err = 0; | |
593 | } | |
1da177e4 LT |
594 | release_sock(sk); |
595 | } | |
596 | done: | |
597 | if (free) | |
598 | kfree(ipc.opt); | |
599 | ip_rt_put(rt); | |
600 | ||
5418c692 JJ |
601 | out: |
602 | if (err < 0) | |
603 | return err; | |
604 | return len; | |
1da177e4 LT |
605 | |
606 | do_confirm: | |
607 | dst_confirm(&rt->u.dst); | |
608 | if (!(msg->msg_flags & MSG_PROBE) || len) | |
609 | goto back_from_confirm; | |
610 | err = 0; | |
611 | goto done; | |
612 | } | |
613 | ||
614 | static void raw_close(struct sock *sk, long timeout) | |
615 | { | |
e905a9ed | 616 | /* |
1da177e4 LT |
617 | * Raw sockets may have direct kernel refereneces. Kill them. |
618 | */ | |
619 | ip_ra_control(sk, 0, NULL); | |
620 | ||
621 | sk_common_release(sk); | |
622 | } | |
623 | ||
7d06b2e0 | 624 | static void raw_destroy(struct sock *sk) |
22dd4850 DL |
625 | { |
626 | lock_sock(sk); | |
627 | ip_flush_pending_frames(sk); | |
628 | release_sock(sk); | |
22dd4850 DL |
629 | } |
630 | ||
1da177e4 LT |
631 | /* This gets rid of all the nasties in af_inet. -DaveM */ |
632 | static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
633 | { | |
634 | struct inet_sock *inet = inet_sk(sk); | |
635 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
636 | int ret = -EINVAL; | |
637 | int chk_addr_ret; | |
638 | ||
639 | if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) | |
640 | goto out; | |
3b1e0a65 | 641 | chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); |
1da177e4 LT |
642 | ret = -EADDRNOTAVAIL; |
643 | if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && | |
644 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) | |
645 | goto out; | |
c720c7e8 | 646 | inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; |
1da177e4 | 647 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
c720c7e8 | 648 | inet->inet_saddr = 0; /* Use device */ |
1da177e4 LT |
649 | sk_dst_reset(sk); |
650 | ret = 0; | |
651 | out: return ret; | |
652 | } | |
653 | ||
654 | /* | |
655 | * This should be easy, if there is something there | |
656 | * we return it, otherwise we block. | |
657 | */ | |
658 | ||
659 | static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
660 | size_t len, int noblock, int flags, int *addr_len) | |
661 | { | |
662 | struct inet_sock *inet = inet_sk(sk); | |
663 | size_t copied = 0; | |
664 | int err = -EOPNOTSUPP; | |
665 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
666 | struct sk_buff *skb; | |
667 | ||
668 | if (flags & MSG_OOB) | |
669 | goto out; | |
670 | ||
671 | if (addr_len) | |
672 | *addr_len = sizeof(*sin); | |
673 | ||
674 | if (flags & MSG_ERRQUEUE) { | |
675 | err = ip_recv_error(sk, msg, len); | |
676 | goto out; | |
677 | } | |
678 | ||
679 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
680 | if (!skb) | |
681 | goto out; | |
682 | ||
683 | copied = skb->len; | |
684 | if (len < copied) { | |
685 | msg->msg_flags |= MSG_TRUNC; | |
686 | copied = len; | |
687 | } | |
688 | ||
689 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
690 | if (err) | |
691 | goto done; | |
692 | ||
3b885787 | 693 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
694 | |
695 | /* Copy the address. */ | |
696 | if (sin) { | |
697 | sin->sin_family = AF_INET; | |
eddc9ec5 | 698 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f59fc7f3 | 699 | sin->sin_port = 0; |
1da177e4 LT |
700 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
701 | } | |
702 | if (inet->cmsg_flags) | |
703 | ip_cmsg_recv(msg, skb); | |
704 | if (flags & MSG_TRUNC) | |
705 | copied = skb->len; | |
706 | done: | |
707 | skb_free_datagram(sk, skb); | |
5418c692 JJ |
708 | out: |
709 | if (err) | |
710 | return err; | |
711 | return copied; | |
1da177e4 LT |
712 | } |
713 | ||
714 | static int raw_init(struct sock *sk) | |
715 | { | |
716 | struct raw_sock *rp = raw_sk(sk); | |
717 | ||
c720c7e8 | 718 | if (inet_sk(sk)->inet_num == IPPROTO_ICMP) |
1da177e4 LT |
719 | memset(&rp->filter, 0, sizeof(rp->filter)); |
720 | return 0; | |
721 | } | |
722 | ||
723 | static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) | |
724 | { | |
725 | if (optlen > sizeof(struct icmp_filter)) | |
726 | optlen = sizeof(struct icmp_filter); | |
727 | if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) | |
728 | return -EFAULT; | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) | |
733 | { | |
734 | int len, ret = -EFAULT; | |
735 | ||
736 | if (get_user(len, optlen)) | |
737 | goto out; | |
738 | ret = -EINVAL; | |
739 | if (len < 0) | |
740 | goto out; | |
741 | if (len > sizeof(struct icmp_filter)) | |
742 | len = sizeof(struct icmp_filter); | |
743 | ret = -EFAULT; | |
744 | if (put_user(len, optlen) || | |
745 | copy_to_user(optval, &raw_sk(sk)->filter, len)) | |
746 | goto out; | |
747 | ret = 0; | |
748 | out: return ret; | |
749 | } | |
750 | ||
3fdadf7d | 751 | static int do_raw_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 752 | char __user *optval, unsigned int optlen) |
1da177e4 | 753 | { |
1da177e4 | 754 | if (optname == ICMP_FILTER) { |
c720c7e8 | 755 | if (inet_sk(sk)->inet_num != IPPROTO_ICMP) |
1da177e4 LT |
756 | return -EOPNOTSUPP; |
757 | else | |
758 | return raw_seticmpfilter(sk, optval, optlen); | |
759 | } | |
760 | return -ENOPROTOOPT; | |
761 | } | |
762 | ||
3fdadf7d | 763 | static int raw_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 764 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
765 | { |
766 | if (level != SOL_RAW) | |
3fdadf7d DM |
767 | return ip_setsockopt(sk, level, optname, optval, optlen); |
768 | return do_raw_setsockopt(sk, level, optname, optval, optlen); | |
769 | } | |
1da177e4 | 770 | |
3fdadf7d DM |
771 | #ifdef CONFIG_COMPAT |
772 | static int compat_raw_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 773 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
774 | { |
775 | if (level != SOL_RAW) | |
543d9cfe | 776 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
777 | return do_raw_setsockopt(sk, level, optname, optval, optlen); |
778 | } | |
779 | #endif | |
780 | ||
781 | static int do_raw_getsockopt(struct sock *sk, int level, int optname, | |
782 | char __user *optval, int __user *optlen) | |
783 | { | |
1da177e4 | 784 | if (optname == ICMP_FILTER) { |
c720c7e8 | 785 | if (inet_sk(sk)->inet_num != IPPROTO_ICMP) |
1da177e4 LT |
786 | return -EOPNOTSUPP; |
787 | else | |
788 | return raw_geticmpfilter(sk, optval, optlen); | |
789 | } | |
790 | return -ENOPROTOOPT; | |
791 | } | |
792 | ||
3fdadf7d DM |
793 | static int raw_getsockopt(struct sock *sk, int level, int optname, |
794 | char __user *optval, int __user *optlen) | |
795 | { | |
796 | if (level != SOL_RAW) | |
797 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
798 | return do_raw_getsockopt(sk, level, optname, optval, optlen); | |
799 | } | |
800 | ||
801 | #ifdef CONFIG_COMPAT | |
802 | static int compat_raw_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 803 | char __user *optval, int __user *optlen) |
3fdadf7d DM |
804 | { |
805 | if (level != SOL_RAW) | |
543d9cfe | 806 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
807 | return do_raw_getsockopt(sk, level, optname, optval, optlen); |
808 | } | |
809 | #endif | |
810 | ||
1da177e4 LT |
811 | static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) |
812 | { | |
813 | switch (cmd) { | |
814 | case SIOCOUTQ: { | |
31e6d363 ED |
815 | int amount = sk_wmem_alloc_get(sk); |
816 | ||
1da177e4 LT |
817 | return put_user(amount, (int __user *)arg); |
818 | } | |
819 | case SIOCINQ: { | |
820 | struct sk_buff *skb; | |
821 | int amount = 0; | |
822 | ||
e0f9f858 | 823 | spin_lock_bh(&sk->sk_receive_queue.lock); |
1da177e4 LT |
824 | skb = skb_peek(&sk->sk_receive_queue); |
825 | if (skb != NULL) | |
826 | amount = skb->len; | |
e0f9f858 | 827 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
1da177e4 LT |
828 | return put_user(amount, (int __user *)arg); |
829 | } | |
830 | ||
831 | default: | |
832 | #ifdef CONFIG_IP_MROUTE | |
833 | return ipmr_ioctl(sk, cmd, (void __user *)arg); | |
834 | #else | |
835 | return -ENOIOCTLCMD; | |
836 | #endif | |
837 | } | |
838 | } | |
839 | ||
840 | struct proto raw_prot = { | |
543d9cfe ACM |
841 | .name = "RAW", |
842 | .owner = THIS_MODULE, | |
843 | .close = raw_close, | |
22dd4850 | 844 | .destroy = raw_destroy, |
543d9cfe ACM |
845 | .connect = ip4_datagram_connect, |
846 | .disconnect = udp_disconnect, | |
847 | .ioctl = raw_ioctl, | |
848 | .init = raw_init, | |
849 | .setsockopt = raw_setsockopt, | |
850 | .getsockopt = raw_getsockopt, | |
851 | .sendmsg = raw_sendmsg, | |
852 | .recvmsg = raw_recvmsg, | |
853 | .bind = raw_bind, | |
854 | .backlog_rcv = raw_rcv_skb, | |
fc8717ba PE |
855 | .hash = raw_hash_sk, |
856 | .unhash = raw_unhash_sk, | |
543d9cfe | 857 | .obj_size = sizeof(struct raw_sock), |
fc8717ba | 858 | .h.raw_hash = &raw_v4_hashinfo, |
3fdadf7d | 859 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
860 | .compat_setsockopt = compat_raw_setsockopt, |
861 | .compat_getsockopt = compat_raw_getsockopt, | |
3fdadf7d | 862 | #endif |
1da177e4 LT |
863 | }; |
864 | ||
865 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
866 | static struct sock *raw_get_first(struct seq_file *seq) |
867 | { | |
868 | struct sock *sk; | |
5a5f3a8d | 869 | struct raw_iter_state *state = raw_seq_private(seq); |
1da177e4 | 870 | |
b673e4df PE |
871 | for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; |
872 | ++state->bucket) { | |
1da177e4 LT |
873 | struct hlist_node *node; |
874 | ||
42a73808 | 875 | sk_for_each(sk, node, &state->h->ht[state->bucket]) |
1218854a | 876 | if (sock_net(sk) == seq_file_net(seq)) |
1da177e4 LT |
877 | goto found; |
878 | } | |
879 | sk = NULL; | |
880 | found: | |
881 | return sk; | |
882 | } | |
883 | ||
884 | static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) | |
885 | { | |
5a5f3a8d | 886 | struct raw_iter_state *state = raw_seq_private(seq); |
1da177e4 LT |
887 | |
888 | do { | |
889 | sk = sk_next(sk); | |
890 | try_again: | |
891 | ; | |
1218854a | 892 | } while (sk && sock_net(sk) != seq_file_net(seq)); |
1da177e4 | 893 | |
b673e4df | 894 | if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { |
42a73808 | 895 | sk = sk_head(&state->h->ht[state->bucket]); |
1da177e4 LT |
896 | goto try_again; |
897 | } | |
898 | return sk; | |
899 | } | |
900 | ||
901 | static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) | |
902 | { | |
903 | struct sock *sk = raw_get_first(seq); | |
904 | ||
905 | if (sk) | |
906 | while (pos && (sk = raw_get_next(seq, sk)) != NULL) | |
907 | --pos; | |
908 | return pos ? NULL : sk; | |
909 | } | |
910 | ||
42a73808 | 911 | void *raw_seq_start(struct seq_file *seq, loff_t *pos) |
1da177e4 | 912 | { |
42a73808 PE |
913 | struct raw_iter_state *state = raw_seq_private(seq); |
914 | ||
915 | read_lock(&state->h->lock); | |
1da177e4 LT |
916 | return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
917 | } | |
42a73808 | 918 | EXPORT_SYMBOL_GPL(raw_seq_start); |
1da177e4 | 919 | |
42a73808 | 920 | void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1da177e4 LT |
921 | { |
922 | struct sock *sk; | |
923 | ||
924 | if (v == SEQ_START_TOKEN) | |
925 | sk = raw_get_first(seq); | |
926 | else | |
927 | sk = raw_get_next(seq, v); | |
928 | ++*pos; | |
929 | return sk; | |
930 | } | |
42a73808 | 931 | EXPORT_SYMBOL_GPL(raw_seq_next); |
1da177e4 | 932 | |
42a73808 | 933 | void raw_seq_stop(struct seq_file *seq, void *v) |
1da177e4 | 934 | { |
42a73808 PE |
935 | struct raw_iter_state *state = raw_seq_private(seq); |
936 | ||
937 | read_unlock(&state->h->lock); | |
1da177e4 | 938 | } |
42a73808 | 939 | EXPORT_SYMBOL_GPL(raw_seq_stop); |
1da177e4 | 940 | |
8cd850ef | 941 | static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) |
1da177e4 LT |
942 | { |
943 | struct inet_sock *inet = inet_sk(sp); | |
c720c7e8 ED |
944 | __be32 dest = inet->inet_daddr, |
945 | src = inet->inet_rcv_saddr; | |
1da177e4 | 946 | __u16 destp = 0, |
c720c7e8 | 947 | srcp = inet->inet_num; |
1da177e4 | 948 | |
8cd850ef | 949 | seq_printf(seq, "%4d: %08X:%04X %08X:%04X" |
68be802c | 950 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", |
e905a9ed | 951 | i, src, srcp, dest, destp, sp->sk_state, |
31e6d363 ED |
952 | sk_wmem_alloc_get(sp), |
953 | sk_rmem_alloc_get(sp), | |
1da177e4 | 954 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), |
33c732c3 | 955 | atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); |
1da177e4 LT |
956 | } |
957 | ||
958 | static int raw_seq_show(struct seq_file *seq, void *v) | |
959 | { | |
1da177e4 | 960 | if (v == SEQ_START_TOKEN) |
8cd850ef DL |
961 | seq_printf(seq, " sl local_address rem_address st tx_queue " |
962 | "rx_queue tr tm->when retrnsmt uid timeout " | |
cb61cb9b | 963 | "inode ref pointer drops\n"); |
8cd850ef DL |
964 | else |
965 | raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); | |
1da177e4 LT |
966 | return 0; |
967 | } | |
968 | ||
f690808e | 969 | static const struct seq_operations raw_seq_ops = { |
1da177e4 LT |
970 | .start = raw_seq_start, |
971 | .next = raw_seq_next, | |
972 | .stop = raw_seq_stop, | |
973 | .show = raw_seq_show, | |
974 | }; | |
975 | ||
3046d767 DL |
976 | int raw_seq_open(struct inode *ino, struct file *file, |
977 | struct raw_hashinfo *h, const struct seq_operations *ops) | |
1da177e4 | 978 | { |
f51d599f | 979 | int err; |
42a73808 PE |
980 | struct raw_iter_state *i; |
981 | ||
3046d767 | 982 | err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); |
f51d599f PE |
983 | if (err < 0) |
984 | return err; | |
42a73808 | 985 | |
f51d599f | 986 | i = raw_seq_private((struct seq_file *)file->private_data); |
42a73808 | 987 | i->h = h; |
42a73808 PE |
988 | return 0; |
989 | } | |
990 | EXPORT_SYMBOL_GPL(raw_seq_open); | |
991 | ||
992 | static int raw_v4_seq_open(struct inode *inode, struct file *file) | |
993 | { | |
3046d767 | 994 | return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); |
1da177e4 LT |
995 | } |
996 | ||
9a32144e | 997 | static const struct file_operations raw_seq_fops = { |
1da177e4 | 998 | .owner = THIS_MODULE, |
42a73808 | 999 | .open = raw_v4_seq_open, |
1da177e4 LT |
1000 | .read = seq_read, |
1001 | .llseek = seq_lseek, | |
f51d599f | 1002 | .release = seq_release_net, |
1da177e4 LT |
1003 | }; |
1004 | ||
a308da16 | 1005 | static __net_init int raw_init_net(struct net *net) |
1da177e4 | 1006 | { |
a308da16 | 1007 | if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops)) |
1da177e4 | 1008 | return -ENOMEM; |
a308da16 | 1009 | |
1da177e4 LT |
1010 | return 0; |
1011 | } | |
1012 | ||
a308da16 PE |
1013 | static __net_exit void raw_exit_net(struct net *net) |
1014 | { | |
1015 | proc_net_remove(net, "raw"); | |
1016 | } | |
1017 | ||
1018 | static __net_initdata struct pernet_operations raw_net_ops = { | |
1019 | .init = raw_init_net, | |
1020 | .exit = raw_exit_net, | |
1021 | }; | |
1022 | ||
1023 | int __init raw_proc_init(void) | |
1024 | { | |
1025 | return register_pernet_subsys(&raw_net_ops); | |
1026 | } | |
1027 | ||
1da177e4 LT |
1028 | void __init raw_proc_exit(void) |
1029 | { | |
a308da16 | 1030 | unregister_pernet_subsys(&raw_net_ops); |
1da177e4 LT |
1031 | } |
1032 | #endif /* CONFIG_PROC_FS */ |