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