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 | * | |
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> | |
63 | #include <linux/gfp.h> | |
64 | #include <linux/ip.h> | |
65 | #include <linux/net.h> | |
66 | #include <net/ip.h> | |
67 | #include <net/icmp.h> | |
68 | #include <net/udp.h> | |
69 | #include <net/raw.h> | |
70 | #include <net/snmp.h> | |
c752f073 | 71 | #include <net/tcp_states.h> |
1da177e4 LT |
72 | #include <net/inet_common.h> |
73 | #include <net/checksum.h> | |
74 | #include <net/xfrm.h> | |
75 | #include <linux/rtnetlink.h> | |
76 | #include <linux/proc_fs.h> | |
77 | #include <linux/seq_file.h> | |
78 | #include <linux/netfilter.h> | |
79 | #include <linux/netfilter_ipv4.h> | |
80 | ||
b673e4df | 81 | static struct raw_hashinfo raw_v4_hashinfo = { |
938b93ad | 82 | .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), |
b673e4df | 83 | }; |
1da177e4 | 84 | |
fc8717ba | 85 | void raw_hash_sk(struct sock *sk) |
1da177e4 | 86 | { |
fc8717ba | 87 | struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; |
65b4c50b | 88 | struct hlist_head *head; |
1da177e4 | 89 | |
65b4c50b PE |
90 | head = &h->ht[inet_sk(sk)->num & (RAW_HTABLE_SIZE - 1)]; |
91 | ||
92 | write_lock_bh(&h->lock); | |
1da177e4 | 93 | sk_add_node(sk, head); |
c29a0bc4 | 94 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
65b4c50b PE |
95 | write_unlock_bh(&h->lock); |
96 | } | |
97 | EXPORT_SYMBOL_GPL(raw_hash_sk); | |
98 | ||
fc8717ba | 99 | void raw_unhash_sk(struct sock *sk) |
ab70768e | 100 | { |
fc8717ba PE |
101 | struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; |
102 | ||
ab70768e PE |
103 | write_lock_bh(&h->lock); |
104 | if (sk_del_node_init(sk)) | |
c29a0bc4 | 105 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
ab70768e PE |
106 | write_unlock_bh(&h->lock); |
107 | } | |
108 | EXPORT_SYMBOL_GPL(raw_unhash_sk); | |
109 | ||
be185884 PE |
110 | static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, |
111 | unsigned short num, __be32 raddr, __be32 laddr, int dif) | |
1da177e4 LT |
112 | { |
113 | struct hlist_node *node; | |
114 | ||
115 | sk_for_each_from(sk, node) { | |
116 | struct inet_sock *inet = inet_sk(sk); | |
117 | ||
878628fb | 118 | if (net_eq(sock_net(sk), net) && inet->num == num && |
1da177e4 LT |
119 | !(inet->daddr && inet->daddr != raddr) && |
120 | !(inet->rcv_saddr && inet->rcv_saddr != laddr) && | |
121 | !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) | |
122 | goto found; /* gotcha */ | |
123 | } | |
124 | sk = NULL; | |
125 | found: | |
126 | return sk; | |
127 | } | |
128 | ||
129 | /* | |
130 | * 0 - deliver | |
131 | * 1 - block | |
132 | */ | |
133 | static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb) | |
134 | { | |
135 | int type; | |
136 | ||
137 | if (!pskb_may_pull(skb, sizeof(struct icmphdr))) | |
138 | return 1; | |
139 | ||
88c7664f | 140 | type = icmp_hdr(skb)->type; |
1da177e4 LT |
141 | if (type < 32) { |
142 | __u32 data = raw_sk(sk)->filter.data; | |
143 | ||
144 | return ((1 << type) & data) != 0; | |
145 | } | |
146 | ||
147 | /* Do not block unknown ICMP types */ | |
148 | return 0; | |
149 | } | |
150 | ||
151 | /* IP input processing comes here for RAW socket delivery. | |
152 | * Caller owns SKB, so we must make clones. | |
153 | * | |
154 | * RFC 1122: SHOULD pass TOS value up to the transport layer. | |
155 | * -> It does. And not only TOS, but all IP header. | |
156 | */ | |
7bc54c90 | 157 | static int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash) |
1da177e4 LT |
158 | { |
159 | struct sock *sk; | |
160 | struct hlist_head *head; | |
d13964f4 | 161 | int delivered = 0; |
be185884 | 162 | struct net *net; |
1da177e4 | 163 | |
b673e4df PE |
164 | read_lock(&raw_v4_hashinfo.lock); |
165 | head = &raw_v4_hashinfo.ht[hash]; | |
1da177e4 LT |
166 | if (hlist_empty(head)) |
167 | goto out; | |
be185884 | 168 | |
c346dca1 | 169 | net = dev_net(skb->dev); |
be185884 | 170 | sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, |
1da177e4 LT |
171 | iph->saddr, iph->daddr, |
172 | skb->dev->ifindex); | |
173 | ||
174 | while (sk) { | |
d13964f4 | 175 | delivered = 1; |
1da177e4 LT |
176 | if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) { |
177 | struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); | |
178 | ||
179 | /* Not releasing hash table! */ | |
180 | if (clone) | |
181 | raw_rcv(sk, clone); | |
182 | } | |
be185884 | 183 | sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, |
1da177e4 LT |
184 | iph->saddr, iph->daddr, |
185 | skb->dev->ifindex); | |
186 | } | |
187 | out: | |
b673e4df | 188 | read_unlock(&raw_v4_hashinfo.lock); |
d13964f4 | 189 | return delivered; |
1da177e4 LT |
190 | } |
191 | ||
7bc54c90 PE |
192 | int raw_local_deliver(struct sk_buff *skb, int protocol) |
193 | { | |
194 | int hash; | |
195 | struct sock *raw_sk; | |
196 | ||
b673e4df PE |
197 | hash = protocol & (RAW_HTABLE_SIZE - 1); |
198 | raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); | |
7bc54c90 PE |
199 | |
200 | /* If there maybe a raw socket we must check - if not we | |
201 | * don't care less | |
202 | */ | |
203 | if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash)) | |
204 | raw_sk = NULL; | |
205 | ||
206 | return raw_sk != NULL; | |
207 | ||
208 | } | |
209 | ||
210 | static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) | |
1da177e4 LT |
211 | { |
212 | struct inet_sock *inet = inet_sk(sk); | |
88c7664f ACM |
213 | const int type = icmp_hdr(skb)->type; |
214 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
215 | int err = 0; |
216 | int harderr = 0; | |
217 | ||
218 | /* Report error on raw socket, if: | |
219 | 1. User requested ip_recverr. | |
220 | 2. Socket is connected (otherwise the error indication | |
221 | is useless without ip_recverr and error is hard. | |
222 | */ | |
223 | if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) | |
224 | return; | |
225 | ||
226 | switch (type) { | |
227 | default: | |
228 | case ICMP_TIME_EXCEEDED: | |
229 | err = EHOSTUNREACH; | |
230 | break; | |
231 | case ICMP_SOURCE_QUENCH: | |
232 | return; | |
233 | case ICMP_PARAMETERPROB: | |
234 | err = EPROTO; | |
235 | harderr = 1; | |
236 | break; | |
237 | case ICMP_DEST_UNREACH: | |
238 | err = EHOSTUNREACH; | |
239 | if (code > NR_ICMP_UNREACH) | |
240 | break; | |
241 | err = icmp_err_convert[code].errno; | |
242 | harderr = icmp_err_convert[code].fatal; | |
243 | if (code == ICMP_FRAG_NEEDED) { | |
244 | harderr = inet->pmtudisc != IP_PMTUDISC_DONT; | |
245 | err = EMSGSIZE; | |
246 | } | |
247 | } | |
248 | ||
249 | if (inet->recverr) { | |
5a5f3a8d | 250 | struct iphdr *iph = (struct iphdr *)skb->data; |
1da177e4 LT |
251 | u8 *payload = skb->data + (iph->ihl << 2); |
252 | ||
253 | if (inet->hdrincl) | |
254 | payload = skb->data; | |
255 | ip_icmp_error(sk, skb, err, 0, info, payload); | |
256 | } | |
257 | ||
258 | if (inet->recverr || harderr) { | |
259 | sk->sk_err = err; | |
260 | sk->sk_error_report(sk); | |
261 | } | |
262 | } | |
263 | ||
7bc54c90 PE |
264 | void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) |
265 | { | |
266 | int hash; | |
267 | struct sock *raw_sk; | |
268 | struct iphdr *iph; | |
be185884 | 269 | struct net *net; |
7bc54c90 | 270 | |
b673e4df | 271 | hash = protocol & (RAW_HTABLE_SIZE - 1); |
7bc54c90 | 272 | |
b673e4df PE |
273 | read_lock(&raw_v4_hashinfo.lock); |
274 | raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); | |
7bc54c90 PE |
275 | if (raw_sk != NULL) { |
276 | iph = (struct iphdr *)skb->data; | |
c346dca1 | 277 | net = dev_net(skb->dev); |
be185884 PE |
278 | |
279 | while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, | |
280 | iph->daddr, iph->saddr, | |
7bc54c90 PE |
281 | skb->dev->ifindex)) != NULL) { |
282 | raw_err(raw_sk, skb, info); | |
283 | raw_sk = sk_next(raw_sk); | |
284 | iph = (struct iphdr *)skb->data; | |
285 | } | |
286 | } | |
b673e4df | 287 | read_unlock(&raw_v4_hashinfo.lock); |
7bc54c90 PE |
288 | } |
289 | ||
1da177e4 LT |
290 | static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) |
291 | { | |
292 | /* Charge it to the socket. */ | |
e905a9ed | 293 | |
1da177e4 | 294 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
33c732c3 | 295 | atomic_inc(&sk->sk_drops); |
1da177e4 LT |
296 | kfree_skb(skb); |
297 | return NET_RX_DROP; | |
298 | } | |
299 | ||
300 | return NET_RX_SUCCESS; | |
301 | } | |
302 | ||
303 | int raw_rcv(struct sock *sk, struct sk_buff *skb) | |
304 | { | |
305 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { | |
33c732c3 | 306 | atomic_inc(&sk->sk_drops); |
1da177e4 LT |
307 | kfree_skb(skb); |
308 | return NET_RX_DROP; | |
309 | } | |
b59c2701 | 310 | nf_reset(skb); |
1da177e4 | 311 | |
d56f90a7 | 312 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
313 | |
314 | raw_rcv_skb(sk, skb); | |
315 | return 0; | |
316 | } | |
317 | ||
f7d7fc03 | 318 | static int raw_send_hdrinc(struct sock *sk, void *from, size_t length, |
e905a9ed | 319 | struct rtable *rt, |
1da177e4 LT |
320 | unsigned int flags) |
321 | { | |
322 | struct inet_sock *inet = inet_sk(sk); | |
0388b004 | 323 | struct net *net = sock_net(sk); |
1da177e4 LT |
324 | struct iphdr *iph; |
325 | struct sk_buff *skb; | |
f844c74f | 326 | unsigned int iphlen; |
1da177e4 LT |
327 | int err; |
328 | ||
329 | if (length > rt->u.dst.dev->mtu) { | |
330 | ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport, | |
331 | rt->u.dst.dev->mtu); | |
332 | return -EMSGSIZE; | |
333 | } | |
334 | if (flags&MSG_PROBE) | |
335 | goto out; | |
336 | ||
f5184d26 JB |
337 | skb = sock_alloc_send_skb(sk, |
338 | length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15, | |
339 | flags & MSG_DONTWAIT, &err); | |
1da177e4 | 340 | if (skb == NULL) |
e905a9ed | 341 | goto error; |
f5184d26 | 342 | skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev)); |
1da177e4 LT |
343 | |
344 | skb->priority = sk->sk_priority; | |
4a19ec58 | 345 | skb->mark = sk->sk_mark; |
adf30907 | 346 | skb_dst_set(skb, dst_clone(&rt->u.dst)); |
1da177e4 | 347 | |
7e28ecc2 | 348 | skb_reset_network_header(skb); |
eddc9ec5 | 349 | iph = ip_hdr(skb); |
7e28ecc2 | 350 | skb_put(skb, length); |
1da177e4 LT |
351 | |
352 | skb->ip_summed = CHECKSUM_NONE; | |
353 | ||
b0e380b1 | 354 | skb->transport_header = skb->network_header; |
1da177e4 LT |
355 | err = memcpy_fromiovecend((void *)iph, from, 0, length); |
356 | if (err) | |
357 | goto error_fault; | |
358 | ||
359 | /* We don't modify invalid header */ | |
f844c74f HX |
360 | iphlen = iph->ihl * 4; |
361 | if (iphlen >= sizeof(*iph) && iphlen <= length) { | |
1da177e4 LT |
362 | if (!iph->saddr) |
363 | iph->saddr = rt->rt_src; | |
364 | iph->check = 0; | |
365 | iph->tot_len = htons(length); | |
366 | if (!iph->id) | |
367 | ip_select_ident(iph, &rt->u.dst, NULL); | |
368 | ||
369 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
370 | } | |
96793b48 | 371 | if (iph->protocol == IPPROTO_ICMP) |
0388b004 | 372 | icmp_out_count(net, ((struct icmphdr *) |
96793b48 | 373 | skb_transport_header(skb))->type); |
1da177e4 | 374 | |
6e23ae2a | 375 | err = NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev, |
1da177e4 LT |
376 | dst_output); |
377 | if (err > 0) | |
6ce9e7b5 | 378 | err = net_xmit_errno(err); |
1da177e4 LT |
379 | if (err) |
380 | goto error; | |
381 | out: | |
382 | return 0; | |
383 | ||
384 | error_fault: | |
385 | err = -EFAULT; | |
386 | kfree_skb(skb); | |
387 | error: | |
5e38e270 | 388 | IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); |
6ce9e7b5 ED |
389 | if (err == -ENOBUFS && !inet->recverr) |
390 | err = 0; | |
e905a9ed | 391 | return err; |
1da177e4 LT |
392 | } |
393 | ||
a27b58fe | 394 | static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) |
1da177e4 LT |
395 | { |
396 | struct iovec *iov; | |
397 | u8 __user *type = NULL; | |
398 | u8 __user *code = NULL; | |
399 | int probed = 0; | |
93765d8a | 400 | unsigned int i; |
1da177e4 LT |
401 | |
402 | if (!msg->msg_iov) | |
a27b58fe | 403 | return 0; |
1da177e4 LT |
404 | |
405 | for (i = 0; i < msg->msg_iovlen; i++) { | |
406 | iov = &msg->msg_iov[i]; | |
407 | if (!iov) | |
408 | continue; | |
409 | ||
410 | switch (fl->proto) { | |
411 | case IPPROTO_ICMP: | |
412 | /* check if one-byte field is readable or not. */ | |
413 | if (iov->iov_base && iov->iov_len < 1) | |
414 | break; | |
415 | ||
416 | if (!type) { | |
417 | type = iov->iov_base; | |
418 | /* check if code field is readable or not. */ | |
419 | if (iov->iov_len > 1) | |
420 | code = type + 1; | |
421 | } else if (!code) | |
422 | code = iov->iov_base; | |
423 | ||
424 | if (type && code) { | |
a27b58fe HC |
425 | if (get_user(fl->fl_icmp_type, type) || |
426 | get_user(fl->fl_icmp_code, code)) | |
427 | return -EFAULT; | |
1da177e4 LT |
428 | probed = 1; |
429 | } | |
430 | break; | |
431 | default: | |
432 | probed = 1; | |
433 | break; | |
434 | } | |
435 | if (probed) | |
436 | break; | |
437 | } | |
a27b58fe | 438 | return 0; |
1da177e4 LT |
439 | } |
440 | ||
441 | static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
442 | size_t len) | |
443 | { | |
444 | struct inet_sock *inet = inet_sk(sk); | |
445 | struct ipcm_cookie ipc; | |
446 | struct rtable *rt = NULL; | |
447 | int free = 0; | |
3ca3c68e | 448 | __be32 daddr; |
c1d18f9f | 449 | __be32 saddr; |
1da177e4 LT |
450 | u8 tos; |
451 | int err; | |
452 | ||
453 | err = -EMSGSIZE; | |
926d4b81 | 454 | if (len > 0xFFFF) |
1da177e4 LT |
455 | goto out; |
456 | ||
457 | /* | |
458 | * Check the flags. | |
459 | */ | |
460 | ||
461 | err = -EOPNOTSUPP; | |
462 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ | |
463 | goto out; /* compatibility */ | |
e905a9ed | 464 | |
1da177e4 | 465 | /* |
e905a9ed | 466 | * Get and verify the address. |
1da177e4 LT |
467 | */ |
468 | ||
469 | if (msg->msg_namelen) { | |
5a5f3a8d | 470 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; |
1da177e4 LT |
471 | err = -EINVAL; |
472 | if (msg->msg_namelen < sizeof(*usin)) | |
473 | goto out; | |
474 | if (usin->sin_family != AF_INET) { | |
475 | static int complained; | |
476 | if (!complained++) | |
477 | printk(KERN_INFO "%s forgot to set AF_INET in " | |
478 | "raw sendmsg. Fix it!\n", | |
479 | current->comm); | |
480 | err = -EAFNOSUPPORT; | |
481 | if (usin->sin_family) | |
482 | goto out; | |
483 | } | |
484 | daddr = usin->sin_addr.s_addr; | |
485 | /* ANK: I did not forget to get protocol from port field. | |
486 | * I just do not know, who uses this weirdness. | |
487 | * IP_HDRINCL is much more convenient. | |
488 | */ | |
489 | } else { | |
490 | err = -EDESTADDRREQ; | |
e905a9ed | 491 | if (sk->sk_state != TCP_ESTABLISHED) |
1da177e4 LT |
492 | goto out; |
493 | daddr = inet->daddr; | |
494 | } | |
495 | ||
496 | ipc.addr = inet->saddr; | |
497 | ipc.opt = NULL; | |
51f31cab | 498 | ipc.shtx.flags = 0; |
1da177e4 LT |
499 | ipc.oif = sk->sk_bound_dev_if; |
500 | ||
501 | if (msg->msg_controllen) { | |
3b1e0a65 | 502 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
1da177e4 LT |
503 | if (err) |
504 | goto out; | |
505 | if (ipc.opt) | |
506 | free = 1; | |
507 | } | |
508 | ||
509 | saddr = ipc.addr; | |
510 | ipc.addr = daddr; | |
511 | ||
512 | if (!ipc.opt) | |
513 | ipc.opt = inet->opt; | |
514 | ||
515 | if (ipc.opt) { | |
516 | err = -EINVAL; | |
517 | /* Linux does not mangle headers on raw sockets, | |
518 | * so that IP options + IP_HDRINCL is non-sense. | |
519 | */ | |
520 | if (inet->hdrincl) | |
521 | goto done; | |
522 | if (ipc.opt->srr) { | |
523 | if (!daddr) | |
524 | goto done; | |
525 | daddr = ipc.opt->faddr; | |
526 | } | |
527 | } | |
528 | tos = RT_CONN_FLAGS(sk); | |
529 | if (msg->msg_flags & MSG_DONTROUTE) | |
530 | tos |= RTO_ONLINK; | |
531 | ||
f97c1e0c | 532 | if (ipv4_is_multicast(daddr)) { |
1da177e4 LT |
533 | if (!ipc.oif) |
534 | ipc.oif = inet->mc_index; | |
535 | if (!saddr) | |
536 | saddr = inet->mc_addr; | |
537 | } | |
538 | ||
539 | { | |
540 | struct flowi fl = { .oif = ipc.oif, | |
4a19ec58 | 541 | .mark = sk->sk_mark, |
1da177e4 LT |
542 | .nl_u = { .ip4_u = |
543 | { .daddr = daddr, | |
544 | .saddr = saddr, | |
545 | .tos = tos } }, | |
546 | .proto = inet->hdrincl ? IPPROTO_RAW : | |
e905a9ed | 547 | sk->sk_protocol, |
1da177e4 | 548 | }; |
a27b58fe HC |
549 | if (!inet->hdrincl) { |
550 | err = raw_probe_proto_opt(&fl, msg); | |
551 | if (err) | |
552 | goto done; | |
553 | } | |
1da177e4 | 554 | |
beb8d13b | 555 | security_sk_classify_flow(sk, &fl); |
3b1e0a65 | 556 | err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 1); |
1da177e4 LT |
557 | } |
558 | if (err) | |
559 | goto done; | |
560 | ||
561 | err = -EACCES; | |
562 | if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) | |
563 | goto done; | |
564 | ||
565 | if (msg->msg_flags & MSG_CONFIRM) | |
566 | goto do_confirm; | |
567 | back_from_confirm: | |
568 | ||
569 | if (inet->hdrincl) | |
e905a9ed | 570 | err = raw_send_hdrinc(sk, msg->msg_iov, len, |
1da177e4 | 571 | rt, msg->msg_flags); |
e905a9ed | 572 | |
1da177e4 LT |
573 | else { |
574 | if (!ipc.addr) | |
575 | ipc.addr = rt->rt_dst; | |
576 | lock_sock(sk); | |
577 | err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, | |
2e77d89b | 578 | &ipc, &rt, msg->msg_flags); |
1da177e4 LT |
579 | if (err) |
580 | ip_flush_pending_frames(sk); | |
6ce9e7b5 | 581 | else if (!(msg->msg_flags & MSG_MORE)) { |
1da177e4 | 582 | err = ip_push_pending_frames(sk); |
6ce9e7b5 ED |
583 | if (err == -ENOBUFS && !inet->recverr) |
584 | err = 0; | |
585 | } | |
1da177e4 LT |
586 | release_sock(sk); |
587 | } | |
588 | done: | |
589 | if (free) | |
590 | kfree(ipc.opt); | |
591 | ip_rt_put(rt); | |
592 | ||
5418c692 JJ |
593 | out: |
594 | if (err < 0) | |
595 | return err; | |
596 | return len; | |
1da177e4 LT |
597 | |
598 | do_confirm: | |
599 | dst_confirm(&rt->u.dst); | |
600 | if (!(msg->msg_flags & MSG_PROBE) || len) | |
601 | goto back_from_confirm; | |
602 | err = 0; | |
603 | goto done; | |
604 | } | |
605 | ||
606 | static void raw_close(struct sock *sk, long timeout) | |
607 | { | |
e905a9ed | 608 | /* |
1da177e4 LT |
609 | * Raw sockets may have direct kernel refereneces. Kill them. |
610 | */ | |
611 | ip_ra_control(sk, 0, NULL); | |
612 | ||
613 | sk_common_release(sk); | |
614 | } | |
615 | ||
7d06b2e0 | 616 | static void raw_destroy(struct sock *sk) |
22dd4850 DL |
617 | { |
618 | lock_sock(sk); | |
619 | ip_flush_pending_frames(sk); | |
620 | release_sock(sk); | |
22dd4850 DL |
621 | } |
622 | ||
1da177e4 LT |
623 | /* This gets rid of all the nasties in af_inet. -DaveM */ |
624 | static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
625 | { | |
626 | struct inet_sock *inet = inet_sk(sk); | |
627 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
628 | int ret = -EINVAL; | |
629 | int chk_addr_ret; | |
630 | ||
631 | if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) | |
632 | goto out; | |
3b1e0a65 | 633 | chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); |
1da177e4 LT |
634 | ret = -EADDRNOTAVAIL; |
635 | if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && | |
636 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) | |
637 | goto out; | |
638 | inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; | |
639 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
640 | inet->saddr = 0; /* Use device */ | |
641 | sk_dst_reset(sk); | |
642 | ret = 0; | |
643 | out: return ret; | |
644 | } | |
645 | ||
646 | /* | |
647 | * This should be easy, if there is something there | |
648 | * we return it, otherwise we block. | |
649 | */ | |
650 | ||
651 | static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
652 | size_t len, int noblock, int flags, int *addr_len) | |
653 | { | |
654 | struct inet_sock *inet = inet_sk(sk); | |
655 | size_t copied = 0; | |
656 | int err = -EOPNOTSUPP; | |
657 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
658 | struct sk_buff *skb; | |
659 | ||
660 | if (flags & MSG_OOB) | |
661 | goto out; | |
662 | ||
663 | if (addr_len) | |
664 | *addr_len = sizeof(*sin); | |
665 | ||
666 | if (flags & MSG_ERRQUEUE) { | |
667 | err = ip_recv_error(sk, msg, len); | |
668 | goto out; | |
669 | } | |
670 | ||
671 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
672 | if (!skb) | |
673 | goto out; | |
674 | ||
675 | copied = skb->len; | |
676 | if (len < copied) { | |
677 | msg->msg_flags |= MSG_TRUNC; | |
678 | copied = len; | |
679 | } | |
680 | ||
681 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
682 | if (err) | |
683 | goto done; | |
684 | ||
685 | sock_recv_timestamp(msg, sk, skb); | |
686 | ||
687 | /* Copy the address. */ | |
688 | if (sin) { | |
689 | sin->sin_family = AF_INET; | |
eddc9ec5 | 690 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f59fc7f3 | 691 | sin->sin_port = 0; |
1da177e4 LT |
692 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
693 | } | |
694 | if (inet->cmsg_flags) | |
695 | ip_cmsg_recv(msg, skb); | |
696 | if (flags & MSG_TRUNC) | |
697 | copied = skb->len; | |
698 | done: | |
699 | skb_free_datagram(sk, skb); | |
5418c692 JJ |
700 | out: |
701 | if (err) | |
702 | return err; | |
703 | return copied; | |
1da177e4 LT |
704 | } |
705 | ||
706 | static int raw_init(struct sock *sk) | |
707 | { | |
708 | struct raw_sock *rp = raw_sk(sk); | |
709 | ||
710 | if (inet_sk(sk)->num == IPPROTO_ICMP) | |
711 | memset(&rp->filter, 0, sizeof(rp->filter)); | |
712 | return 0; | |
713 | } | |
714 | ||
715 | static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) | |
716 | { | |
717 | if (optlen > sizeof(struct icmp_filter)) | |
718 | optlen = sizeof(struct icmp_filter); | |
719 | if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) | |
720 | return -EFAULT; | |
721 | return 0; | |
722 | } | |
723 | ||
724 | static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) | |
725 | { | |
726 | int len, ret = -EFAULT; | |
727 | ||
728 | if (get_user(len, optlen)) | |
729 | goto out; | |
730 | ret = -EINVAL; | |
731 | if (len < 0) | |
732 | goto out; | |
733 | if (len > sizeof(struct icmp_filter)) | |
734 | len = sizeof(struct icmp_filter); | |
735 | ret = -EFAULT; | |
736 | if (put_user(len, optlen) || | |
737 | copy_to_user(optval, &raw_sk(sk)->filter, len)) | |
738 | goto out; | |
739 | ret = 0; | |
740 | out: return ret; | |
741 | } | |
742 | ||
3fdadf7d | 743 | static int do_raw_setsockopt(struct sock *sk, int level, int optname, |
1da177e4 LT |
744 | char __user *optval, int optlen) |
745 | { | |
1da177e4 LT |
746 | if (optname == ICMP_FILTER) { |
747 | if (inet_sk(sk)->num != IPPROTO_ICMP) | |
748 | return -EOPNOTSUPP; | |
749 | else | |
750 | return raw_seticmpfilter(sk, optval, optlen); | |
751 | } | |
752 | return -ENOPROTOOPT; | |
753 | } | |
754 | ||
3fdadf7d DM |
755 | static int raw_setsockopt(struct sock *sk, int level, int optname, |
756 | char __user *optval, int optlen) | |
1da177e4 LT |
757 | { |
758 | if (level != SOL_RAW) | |
3fdadf7d DM |
759 | return ip_setsockopt(sk, level, optname, optval, optlen); |
760 | return do_raw_setsockopt(sk, level, optname, optval, optlen); | |
761 | } | |
1da177e4 | 762 | |
3fdadf7d DM |
763 | #ifdef CONFIG_COMPAT |
764 | static int compat_raw_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 765 | char __user *optval, int optlen) |
3fdadf7d DM |
766 | { |
767 | if (level != SOL_RAW) | |
543d9cfe | 768 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
769 | return do_raw_setsockopt(sk, level, optname, optval, optlen); |
770 | } | |
771 | #endif | |
772 | ||
773 | static int do_raw_getsockopt(struct sock *sk, int level, int optname, | |
774 | char __user *optval, int __user *optlen) | |
775 | { | |
1da177e4 LT |
776 | if (optname == ICMP_FILTER) { |
777 | if (inet_sk(sk)->num != IPPROTO_ICMP) | |
778 | return -EOPNOTSUPP; | |
779 | else | |
780 | return raw_geticmpfilter(sk, optval, optlen); | |
781 | } | |
782 | return -ENOPROTOOPT; | |
783 | } | |
784 | ||
3fdadf7d DM |
785 | static int raw_getsockopt(struct sock *sk, int level, int optname, |
786 | char __user *optval, int __user *optlen) | |
787 | { | |
788 | if (level != SOL_RAW) | |
789 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
790 | return do_raw_getsockopt(sk, level, optname, optval, optlen); | |
791 | } | |
792 | ||
793 | #ifdef CONFIG_COMPAT | |
794 | static int compat_raw_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 795 | char __user *optval, int __user *optlen) |
3fdadf7d DM |
796 | { |
797 | if (level != SOL_RAW) | |
543d9cfe | 798 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
799 | return do_raw_getsockopt(sk, level, optname, optval, optlen); |
800 | } | |
801 | #endif | |
802 | ||
1da177e4 LT |
803 | static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) |
804 | { | |
805 | switch (cmd) { | |
806 | case SIOCOUTQ: { | |
31e6d363 ED |
807 | int amount = sk_wmem_alloc_get(sk); |
808 | ||
1da177e4 LT |
809 | return put_user(amount, (int __user *)arg); |
810 | } | |
811 | case SIOCINQ: { | |
812 | struct sk_buff *skb; | |
813 | int amount = 0; | |
814 | ||
e0f9f858 | 815 | spin_lock_bh(&sk->sk_receive_queue.lock); |
1da177e4 LT |
816 | skb = skb_peek(&sk->sk_receive_queue); |
817 | if (skb != NULL) | |
818 | amount = skb->len; | |
e0f9f858 | 819 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
1da177e4 LT |
820 | return put_user(amount, (int __user *)arg); |
821 | } | |
822 | ||
823 | default: | |
824 | #ifdef CONFIG_IP_MROUTE | |
825 | return ipmr_ioctl(sk, cmd, (void __user *)arg); | |
826 | #else | |
827 | return -ENOIOCTLCMD; | |
828 | #endif | |
829 | } | |
830 | } | |
831 | ||
832 | struct proto raw_prot = { | |
543d9cfe ACM |
833 | .name = "RAW", |
834 | .owner = THIS_MODULE, | |
835 | .close = raw_close, | |
22dd4850 | 836 | .destroy = raw_destroy, |
543d9cfe ACM |
837 | .connect = ip4_datagram_connect, |
838 | .disconnect = udp_disconnect, | |
839 | .ioctl = raw_ioctl, | |
840 | .init = raw_init, | |
841 | .setsockopt = raw_setsockopt, | |
842 | .getsockopt = raw_getsockopt, | |
843 | .sendmsg = raw_sendmsg, | |
844 | .recvmsg = raw_recvmsg, | |
845 | .bind = raw_bind, | |
846 | .backlog_rcv = raw_rcv_skb, | |
fc8717ba PE |
847 | .hash = raw_hash_sk, |
848 | .unhash = raw_unhash_sk, | |
543d9cfe | 849 | .obj_size = sizeof(struct raw_sock), |
fc8717ba | 850 | .h.raw_hash = &raw_v4_hashinfo, |
3fdadf7d | 851 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
852 | .compat_setsockopt = compat_raw_setsockopt, |
853 | .compat_getsockopt = compat_raw_getsockopt, | |
3fdadf7d | 854 | #endif |
1da177e4 LT |
855 | }; |
856 | ||
857 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
858 | static struct sock *raw_get_first(struct seq_file *seq) |
859 | { | |
860 | struct sock *sk; | |
5a5f3a8d | 861 | struct raw_iter_state *state = raw_seq_private(seq); |
1da177e4 | 862 | |
b673e4df PE |
863 | for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; |
864 | ++state->bucket) { | |
1da177e4 LT |
865 | struct hlist_node *node; |
866 | ||
42a73808 | 867 | sk_for_each(sk, node, &state->h->ht[state->bucket]) |
1218854a | 868 | if (sock_net(sk) == seq_file_net(seq)) |
1da177e4 LT |
869 | goto found; |
870 | } | |
871 | sk = NULL; | |
872 | found: | |
873 | return sk; | |
874 | } | |
875 | ||
876 | static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) | |
877 | { | |
5a5f3a8d | 878 | struct raw_iter_state *state = raw_seq_private(seq); |
1da177e4 LT |
879 | |
880 | do { | |
881 | sk = sk_next(sk); | |
882 | try_again: | |
883 | ; | |
1218854a | 884 | } while (sk && sock_net(sk) != seq_file_net(seq)); |
1da177e4 | 885 | |
b673e4df | 886 | if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { |
42a73808 | 887 | sk = sk_head(&state->h->ht[state->bucket]); |
1da177e4 LT |
888 | goto try_again; |
889 | } | |
890 | return sk; | |
891 | } | |
892 | ||
893 | static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) | |
894 | { | |
895 | struct sock *sk = raw_get_first(seq); | |
896 | ||
897 | if (sk) | |
898 | while (pos && (sk = raw_get_next(seq, sk)) != NULL) | |
899 | --pos; | |
900 | return pos ? NULL : sk; | |
901 | } | |
902 | ||
42a73808 | 903 | void *raw_seq_start(struct seq_file *seq, loff_t *pos) |
1da177e4 | 904 | { |
42a73808 PE |
905 | struct raw_iter_state *state = raw_seq_private(seq); |
906 | ||
907 | read_lock(&state->h->lock); | |
1da177e4 LT |
908 | return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
909 | } | |
42a73808 | 910 | EXPORT_SYMBOL_GPL(raw_seq_start); |
1da177e4 | 911 | |
42a73808 | 912 | void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1da177e4 LT |
913 | { |
914 | struct sock *sk; | |
915 | ||
916 | if (v == SEQ_START_TOKEN) | |
917 | sk = raw_get_first(seq); | |
918 | else | |
919 | sk = raw_get_next(seq, v); | |
920 | ++*pos; | |
921 | return sk; | |
922 | } | |
42a73808 | 923 | EXPORT_SYMBOL_GPL(raw_seq_next); |
1da177e4 | 924 | |
42a73808 | 925 | void raw_seq_stop(struct seq_file *seq, void *v) |
1da177e4 | 926 | { |
42a73808 PE |
927 | struct raw_iter_state *state = raw_seq_private(seq); |
928 | ||
929 | read_unlock(&state->h->lock); | |
1da177e4 | 930 | } |
42a73808 | 931 | EXPORT_SYMBOL_GPL(raw_seq_stop); |
1da177e4 | 932 | |
8cd850ef | 933 | static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) |
1da177e4 LT |
934 | { |
935 | struct inet_sock *inet = inet_sk(sp); | |
714e85be AV |
936 | __be32 dest = inet->daddr, |
937 | src = inet->rcv_saddr; | |
1da177e4 LT |
938 | __u16 destp = 0, |
939 | srcp = inet->num; | |
940 | ||
8cd850ef | 941 | seq_printf(seq, "%4d: %08X:%04X %08X:%04X" |
68be802c | 942 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", |
e905a9ed | 943 | i, src, srcp, dest, destp, sp->sk_state, |
31e6d363 ED |
944 | sk_wmem_alloc_get(sp), |
945 | sk_rmem_alloc_get(sp), | |
1da177e4 | 946 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), |
33c732c3 | 947 | atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); |
1da177e4 LT |
948 | } |
949 | ||
950 | static int raw_seq_show(struct seq_file *seq, void *v) | |
951 | { | |
1da177e4 | 952 | if (v == SEQ_START_TOKEN) |
8cd850ef DL |
953 | seq_printf(seq, " sl local_address rem_address st tx_queue " |
954 | "rx_queue tr tm->when retrnsmt uid timeout " | |
cb61cb9b | 955 | "inode ref pointer drops\n"); |
8cd850ef DL |
956 | else |
957 | raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); | |
1da177e4 LT |
958 | return 0; |
959 | } | |
960 | ||
f690808e | 961 | static const struct seq_operations raw_seq_ops = { |
1da177e4 LT |
962 | .start = raw_seq_start, |
963 | .next = raw_seq_next, | |
964 | .stop = raw_seq_stop, | |
965 | .show = raw_seq_show, | |
966 | }; | |
967 | ||
3046d767 DL |
968 | int raw_seq_open(struct inode *ino, struct file *file, |
969 | struct raw_hashinfo *h, const struct seq_operations *ops) | |
1da177e4 | 970 | { |
f51d599f | 971 | int err; |
42a73808 PE |
972 | struct raw_iter_state *i; |
973 | ||
3046d767 | 974 | err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); |
f51d599f PE |
975 | if (err < 0) |
976 | return err; | |
42a73808 | 977 | |
f51d599f | 978 | i = raw_seq_private((struct seq_file *)file->private_data); |
42a73808 | 979 | i->h = h; |
42a73808 PE |
980 | return 0; |
981 | } | |
982 | EXPORT_SYMBOL_GPL(raw_seq_open); | |
983 | ||
984 | static int raw_v4_seq_open(struct inode *inode, struct file *file) | |
985 | { | |
3046d767 | 986 | return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); |
1da177e4 LT |
987 | } |
988 | ||
9a32144e | 989 | static const struct file_operations raw_seq_fops = { |
1da177e4 | 990 | .owner = THIS_MODULE, |
42a73808 | 991 | .open = raw_v4_seq_open, |
1da177e4 LT |
992 | .read = seq_read, |
993 | .llseek = seq_lseek, | |
f51d599f | 994 | .release = seq_release_net, |
1da177e4 LT |
995 | }; |
996 | ||
a308da16 | 997 | static __net_init int raw_init_net(struct net *net) |
1da177e4 | 998 | { |
a308da16 | 999 | if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops)) |
1da177e4 | 1000 | return -ENOMEM; |
a308da16 | 1001 | |
1da177e4 LT |
1002 | return 0; |
1003 | } | |
1004 | ||
a308da16 PE |
1005 | static __net_exit void raw_exit_net(struct net *net) |
1006 | { | |
1007 | proc_net_remove(net, "raw"); | |
1008 | } | |
1009 | ||
1010 | static __net_initdata struct pernet_operations raw_net_ops = { | |
1011 | .init = raw_init_net, | |
1012 | .exit = raw_exit_net, | |
1013 | }; | |
1014 | ||
1015 | int __init raw_proc_init(void) | |
1016 | { | |
1017 | return register_pernet_subsys(&raw_net_ops); | |
1018 | } | |
1019 | ||
1da177e4 LT |
1020 | void __init raw_proc_exit(void) |
1021 | { | |
a308da16 | 1022 | unregister_pernet_subsys(&raw_net_ops); |
1da177e4 LT |
1023 | } |
1024 | #endif /* CONFIG_PROC_FS */ |