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 | * The IP to API glue. | |
7 | * | |
8 | * Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $ | |
9 | * | |
10 | * Authors: see ip.c | |
11 | * | |
12 | * Fixes: | |
13 | * Many : Split from ip.c , see ip.c for history. | |
14 | * Martin Mares : TOS setting fixed. | |
15 | * Alan Cox : Fixed a couple of oopses in Martin's | |
16 | * TOS tweaks. | |
17 | * Mike McLagan : Routing by source | |
18 | */ | |
19 | ||
1da177e4 LT |
20 | #include <linux/module.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/ip.h> | |
26 | #include <linux/icmp.h> | |
14c85021 | 27 | #include <linux/inetdevice.h> |
1da177e4 LT |
28 | #include <linux/netdevice.h> |
29 | #include <net/sock.h> | |
30 | #include <net/ip.h> | |
31 | #include <net/icmp.h> | |
d83d8461 | 32 | #include <net/tcp_states.h> |
1da177e4 LT |
33 | #include <linux/udp.h> |
34 | #include <linux/igmp.h> | |
35 | #include <linux/netfilter.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/mroute.h> | |
38 | #include <net/route.h> | |
39 | #include <net/xfrm.h> | |
40 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
41 | #include <net/transp_v6.h> | |
42 | #endif | |
43 | ||
44 | #include <linux/errqueue.h> | |
45 | #include <asm/uaccess.h> | |
46 | ||
47 | #define IP_CMSG_PKTINFO 1 | |
48 | #define IP_CMSG_TTL 2 | |
49 | #define IP_CMSG_TOS 4 | |
50 | #define IP_CMSG_RECVOPTS 8 | |
51 | #define IP_CMSG_RETOPTS 16 | |
2c7946a7 | 52 | #define IP_CMSG_PASSSEC 32 |
1da177e4 LT |
53 | |
54 | /* | |
55 | * SOL_IP control messages. | |
56 | */ | |
57 | ||
58 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
59 | { | |
60 | struct in_pktinfo info; | |
61 | struct rtable *rt = (struct rtable *)skb->dst; | |
62 | ||
63 | info.ipi_addr.s_addr = skb->nh.iph->daddr; | |
64 | if (rt) { | |
65 | info.ipi_ifindex = rt->rt_iif; | |
66 | info.ipi_spec_dst.s_addr = rt->rt_spec_dst; | |
67 | } else { | |
68 | info.ipi_ifindex = 0; | |
69 | info.ipi_spec_dst.s_addr = 0; | |
70 | } | |
71 | ||
72 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
73 | } | |
74 | ||
75 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
76 | { | |
77 | int ttl = skb->nh.iph->ttl; | |
78 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); | |
79 | } | |
80 | ||
81 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
82 | { | |
83 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos); | |
84 | } | |
85 | ||
86 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
87 | { | |
88 | if (IPCB(skb)->opt.optlen == 0) | |
89 | return; | |
90 | ||
91 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1); | |
92 | } | |
93 | ||
94 | ||
95 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
96 | { | |
97 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
98 | struct ip_options * opt = (struct ip_options*)optbuf; | |
99 | ||
100 | if (IPCB(skb)->opt.optlen == 0) | |
101 | return; | |
102 | ||
103 | if (ip_options_echo(opt, skb)) { | |
104 | msg->msg_flags |= MSG_CTRUNC; | |
105 | return; | |
106 | } | |
107 | ip_options_undo(opt); | |
108 | ||
109 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
110 | } | |
111 | ||
2c7946a7 CZ |
112 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
113 | { | |
114 | char *secdata; | |
115 | u32 seclen; | |
116 | int err; | |
117 | ||
118 | err = security_socket_getpeersec_dgram(skb, &secdata, &seclen); | |
119 | if (err) | |
120 | return; | |
121 | ||
122 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
123 | } | |
124 | ||
1da177e4 LT |
125 | |
126 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) | |
127 | { | |
128 | struct inet_sock *inet = inet_sk(skb->sk); | |
129 | unsigned flags = inet->cmsg_flags; | |
130 | ||
131 | /* Ordered by supposed usage frequency */ | |
132 | if (flags & 1) | |
133 | ip_cmsg_recv_pktinfo(msg, skb); | |
134 | if ((flags>>=1) == 0) | |
135 | return; | |
136 | ||
137 | if (flags & 1) | |
138 | ip_cmsg_recv_ttl(msg, skb); | |
139 | if ((flags>>=1) == 0) | |
140 | return; | |
141 | ||
142 | if (flags & 1) | |
143 | ip_cmsg_recv_tos(msg, skb); | |
144 | if ((flags>>=1) == 0) | |
145 | return; | |
146 | ||
147 | if (flags & 1) | |
148 | ip_cmsg_recv_opts(msg, skb); | |
149 | if ((flags>>=1) == 0) | |
150 | return; | |
151 | ||
152 | if (flags & 1) | |
153 | ip_cmsg_recv_retopts(msg, skb); | |
2c7946a7 CZ |
154 | if ((flags>>=1) == 0) |
155 | return; | |
156 | ||
157 | if (flags & 1) | |
158 | ip_cmsg_recv_security(msg, skb); | |
1da177e4 LT |
159 | } |
160 | ||
161 | int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc) | |
162 | { | |
163 | int err; | |
164 | struct cmsghdr *cmsg; | |
165 | ||
166 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
167 | if (!CMSG_OK(msg, cmsg)) | |
168 | return -EINVAL; | |
169 | if (cmsg->cmsg_level != SOL_IP) | |
170 | continue; | |
171 | switch (cmsg->cmsg_type) { | |
172 | case IP_RETOPTS: | |
173 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4c6ea29d | 174 | err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40); |
1da177e4 LT |
175 | if (err) |
176 | return err; | |
177 | break; | |
178 | case IP_PKTINFO: | |
179 | { | |
180 | struct in_pktinfo *info; | |
181 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
182 | return -EINVAL; | |
183 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
184 | ipc->oif = info->ipi_ifindex; | |
185 | ipc->addr = info->ipi_spec_dst.s_addr; | |
186 | break; | |
187 | } | |
188 | default: | |
189 | return -EINVAL; | |
190 | } | |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
195 | ||
196 | /* Special input handler for packets caught by router alert option. | |
197 | They are selected only by protocol field, and then processed likely | |
198 | local ones; but only if someone wants them! Otherwise, router | |
199 | not running rsvpd will kill RSVP. | |
200 | ||
201 | It is user level problem, what it will make with them. | |
202 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
203 | but receiver should be enough clever f.e. to forward mtrace requests, | |
204 | sent to multicast group to reach destination designated router. | |
205 | */ | |
206 | struct ip_ra_chain *ip_ra_chain; | |
207 | DEFINE_RWLOCK(ip_ra_lock); | |
208 | ||
209 | int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)) | |
210 | { | |
211 | struct ip_ra_chain *ra, *new_ra, **rap; | |
212 | ||
213 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW) | |
214 | return -EINVAL; | |
215 | ||
216 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
217 | ||
218 | write_lock_bh(&ip_ra_lock); | |
219 | for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) { | |
220 | if (ra->sk == sk) { | |
221 | if (on) { | |
222 | write_unlock_bh(&ip_ra_lock); | |
a51482bd | 223 | kfree(new_ra); |
1da177e4 LT |
224 | return -EADDRINUSE; |
225 | } | |
226 | *rap = ra->next; | |
227 | write_unlock_bh(&ip_ra_lock); | |
228 | ||
229 | if (ra->destructor) | |
230 | ra->destructor(sk); | |
231 | sock_put(sk); | |
232 | kfree(ra); | |
233 | return 0; | |
234 | } | |
235 | } | |
236 | if (new_ra == NULL) { | |
237 | write_unlock_bh(&ip_ra_lock); | |
238 | return -ENOBUFS; | |
239 | } | |
240 | new_ra->sk = sk; | |
241 | new_ra->destructor = destructor; | |
242 | ||
243 | new_ra->next = ra; | |
244 | *rap = new_ra; | |
245 | sock_hold(sk); | |
246 | write_unlock_bh(&ip_ra_lock); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, | |
252 | u16 port, u32 info, u8 *payload) | |
253 | { | |
254 | struct inet_sock *inet = inet_sk(sk); | |
255 | struct sock_exterr_skb *serr; | |
256 | ||
257 | if (!inet->recverr) | |
258 | return; | |
259 | ||
260 | skb = skb_clone(skb, GFP_ATOMIC); | |
261 | if (!skb) | |
262 | return; | |
263 | ||
264 | serr = SKB_EXT_ERR(skb); | |
265 | serr->ee.ee_errno = err; | |
266 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
267 | serr->ee.ee_type = skb->h.icmph->type; | |
268 | serr->ee.ee_code = skb->h.icmph->code; | |
269 | serr->ee.ee_pad = 0; | |
270 | serr->ee.ee_info = info; | |
271 | serr->ee.ee_data = 0; | |
272 | serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw; | |
273 | serr->port = port; | |
274 | ||
275 | skb->h.raw = payload; | |
276 | if (!skb_pull(skb, payload - skb->data) || | |
277 | sock_queue_err_skb(sk, skb)) | |
278 | kfree_skb(skb); | |
279 | } | |
280 | ||
281 | void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info) | |
282 | { | |
283 | struct inet_sock *inet = inet_sk(sk); | |
284 | struct sock_exterr_skb *serr; | |
285 | struct iphdr *iph; | |
286 | struct sk_buff *skb; | |
287 | ||
288 | if (!inet->recverr) | |
289 | return; | |
290 | ||
291 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
292 | if (!skb) | |
293 | return; | |
294 | ||
295 | iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr)); | |
296 | skb->nh.iph = iph; | |
297 | iph->daddr = daddr; | |
298 | ||
299 | serr = SKB_EXT_ERR(skb); | |
300 | serr->ee.ee_errno = err; | |
301 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
302 | serr->ee.ee_type = 0; | |
303 | serr->ee.ee_code = 0; | |
304 | serr->ee.ee_pad = 0; | |
305 | serr->ee.ee_info = info; | |
306 | serr->ee.ee_data = 0; | |
307 | serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw; | |
308 | serr->port = port; | |
309 | ||
310 | skb->h.raw = skb->tail; | |
311 | __skb_pull(skb, skb->tail - skb->data); | |
312 | ||
313 | if (sock_queue_err_skb(sk, skb)) | |
314 | kfree_skb(skb); | |
315 | } | |
316 | ||
317 | /* | |
318 | * Handle MSG_ERRQUEUE | |
319 | */ | |
320 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
321 | { | |
322 | struct sock_exterr_skb *serr; | |
323 | struct sk_buff *skb, *skb2; | |
324 | struct sockaddr_in *sin; | |
325 | struct { | |
326 | struct sock_extended_err ee; | |
327 | struct sockaddr_in offender; | |
328 | } errhdr; | |
329 | int err; | |
330 | int copied; | |
331 | ||
332 | err = -EAGAIN; | |
333 | skb = skb_dequeue(&sk->sk_error_queue); | |
334 | if (skb == NULL) | |
335 | goto out; | |
336 | ||
337 | copied = skb->len; | |
338 | if (copied > len) { | |
339 | msg->msg_flags |= MSG_TRUNC; | |
340 | copied = len; | |
341 | } | |
342 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
343 | if (err) | |
344 | goto out_free_skb; | |
345 | ||
346 | sock_recv_timestamp(msg, sk, skb); | |
347 | ||
348 | serr = SKB_EXT_ERR(skb); | |
349 | ||
350 | sin = (struct sockaddr_in *)msg->msg_name; | |
351 | if (sin) { | |
352 | sin->sin_family = AF_INET; | |
353 | sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset); | |
354 | sin->sin_port = serr->port; | |
355 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
356 | } | |
357 | ||
358 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
359 | sin = &errhdr.offender; | |
360 | sin->sin_family = AF_UNSPEC; | |
361 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { | |
362 | struct inet_sock *inet = inet_sk(sk); | |
363 | ||
364 | sin->sin_family = AF_INET; | |
365 | sin->sin_addr.s_addr = skb->nh.iph->saddr; | |
366 | sin->sin_port = 0; | |
367 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
368 | if (inet->cmsg_flags) | |
369 | ip_cmsg_recv(msg, skb); | |
370 | } | |
371 | ||
372 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
373 | ||
374 | /* Now we could try to dump offended packet options */ | |
375 | ||
376 | msg->msg_flags |= MSG_ERRQUEUE; | |
377 | err = copied; | |
378 | ||
379 | /* Reset and regenerate socket error */ | |
e0f9f858 | 380 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
381 | sk->sk_err = 0; |
382 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
383 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
e0f9f858 | 384 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
385 | sk->sk_error_report(sk); |
386 | } else | |
e0f9f858 | 387 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
388 | |
389 | out_free_skb: | |
390 | kfree_skb(skb); | |
391 | out: | |
392 | return err; | |
393 | } | |
394 | ||
395 | ||
396 | /* | |
397 | * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on | |
398 | * an IP socket. | |
399 | */ | |
400 | ||
3fdadf7d DM |
401 | static int do_ip_setsockopt(struct sock *sk, int level, |
402 | int optname, char __user *optval, int optlen) | |
1da177e4 LT |
403 | { |
404 | struct inet_sock *inet = inet_sk(sk); | |
405 | int val=0,err; | |
406 | ||
1da177e4 LT |
407 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
408 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | | |
409 | (1<<IP_RETOPTS) | (1<<IP_TOS) | | |
410 | (1<<IP_TTL) | (1<<IP_HDRINCL) | | |
411 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | | |
2c7946a7 CZ |
412 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | |
413 | (1<<IP_PASSSEC))) || | |
1da177e4 LT |
414 | optname == IP_MULTICAST_TTL || |
415 | optname == IP_MULTICAST_LOOP) { | |
416 | if (optlen >= sizeof(int)) { | |
417 | if (get_user(val, (int __user *) optval)) | |
418 | return -EFAULT; | |
419 | } else if (optlen >= sizeof(char)) { | |
420 | unsigned char ucval; | |
421 | ||
422 | if (get_user(ucval, (unsigned char __user *) optval)) | |
423 | return -EFAULT; | |
424 | val = (int) ucval; | |
425 | } | |
426 | } | |
427 | ||
428 | /* If optlen==0, it is equivalent to val == 0 */ | |
429 | ||
430 | #ifdef CONFIG_IP_MROUTE | |
431 | if (optname >= MRT_BASE && optname <= (MRT_BASE + 10)) | |
432 | return ip_mroute_setsockopt(sk,optname,optval,optlen); | |
433 | #endif | |
434 | ||
435 | err = 0; | |
436 | lock_sock(sk); | |
437 | ||
438 | switch (optname) { | |
439 | case IP_OPTIONS: | |
440 | { | |
441 | struct ip_options * opt = NULL; | |
442 | if (optlen > 40 || optlen < 0) | |
443 | goto e_inval; | |
4c6ea29d | 444 | err = ip_options_get_from_user(&opt, optval, optlen); |
1da177e4 LT |
445 | if (err) |
446 | break; | |
d83d8461 ACM |
447 | if (inet->is_icsk) { |
448 | struct inet_connection_sock *icsk = inet_csk(sk); | |
1da177e4 LT |
449 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
450 | if (sk->sk_family == PF_INET || | |
451 | (!((1 << sk->sk_state) & | |
452 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
453 | inet->daddr != LOOPBACK4_IPV6)) { | |
454 | #endif | |
455 | if (inet->opt) | |
d83d8461 | 456 | icsk->icsk_ext_hdr_len -= inet->opt->optlen; |
1da177e4 | 457 | if (opt) |
d83d8461 ACM |
458 | icsk->icsk_ext_hdr_len += opt->optlen; |
459 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); | |
1da177e4 LT |
460 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
461 | } | |
462 | #endif | |
463 | } | |
464 | opt = xchg(&inet->opt, opt); | |
a51482bd | 465 | kfree(opt); |
1da177e4 LT |
466 | break; |
467 | } | |
468 | case IP_PKTINFO: | |
469 | if (val) | |
470 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
471 | else | |
472 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
473 | break; | |
474 | case IP_RECVTTL: | |
475 | if (val) | |
476 | inet->cmsg_flags |= IP_CMSG_TTL; | |
477 | else | |
478 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
479 | break; | |
480 | case IP_RECVTOS: | |
481 | if (val) | |
482 | inet->cmsg_flags |= IP_CMSG_TOS; | |
483 | else | |
484 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
485 | break; | |
486 | case IP_RECVOPTS: | |
487 | if (val) | |
488 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
489 | else | |
490 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
491 | break; | |
492 | case IP_RETOPTS: | |
493 | if (val) | |
494 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
495 | else | |
496 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
497 | break; | |
2c7946a7 CZ |
498 | case IP_PASSSEC: |
499 | if (val) | |
500 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
501 | else | |
502 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
503 | break; | |
1da177e4 LT |
504 | case IP_TOS: /* This sets both TOS and Precedence */ |
505 | if (sk->sk_type == SOCK_STREAM) { | |
506 | val &= ~3; | |
507 | val |= inet->tos & 3; | |
508 | } | |
509 | if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP && | |
510 | !capable(CAP_NET_ADMIN)) { | |
511 | err = -EPERM; | |
512 | break; | |
513 | } | |
514 | if (inet->tos != val) { | |
515 | inet->tos = val; | |
516 | sk->sk_priority = rt_tos2priority(val); | |
517 | sk_dst_reset(sk); | |
518 | } | |
519 | break; | |
520 | case IP_TTL: | |
521 | if (optlen<1) | |
522 | goto e_inval; | |
523 | if (val != -1 && (val < 1 || val>255)) | |
524 | goto e_inval; | |
525 | inet->uc_ttl = val; | |
526 | break; | |
527 | case IP_HDRINCL: | |
528 | if (sk->sk_type != SOCK_RAW) { | |
529 | err = -ENOPROTOOPT; | |
530 | break; | |
531 | } | |
532 | inet->hdrincl = val ? 1 : 0; | |
533 | break; | |
534 | case IP_MTU_DISCOVER: | |
535 | if (val<0 || val>2) | |
536 | goto e_inval; | |
537 | inet->pmtudisc = val; | |
538 | break; | |
539 | case IP_RECVERR: | |
540 | inet->recverr = !!val; | |
541 | if (!val) | |
542 | skb_queue_purge(&sk->sk_error_queue); | |
543 | break; | |
544 | case IP_MULTICAST_TTL: | |
545 | if (sk->sk_type == SOCK_STREAM) | |
546 | goto e_inval; | |
547 | if (optlen<1) | |
548 | goto e_inval; | |
549 | if (val==-1) | |
550 | val = 1; | |
551 | if (val < 0 || val > 255) | |
552 | goto e_inval; | |
553 | inet->mc_ttl = val; | |
554 | break; | |
555 | case IP_MULTICAST_LOOP: | |
556 | if (optlen<1) | |
557 | goto e_inval; | |
558 | inet->mc_loop = !!val; | |
559 | break; | |
560 | case IP_MULTICAST_IF: | |
561 | { | |
562 | struct ip_mreqn mreq; | |
563 | struct net_device *dev = NULL; | |
564 | ||
565 | if (sk->sk_type == SOCK_STREAM) | |
566 | goto e_inval; | |
567 | /* | |
568 | * Check the arguments are allowable | |
569 | */ | |
570 | ||
571 | err = -EFAULT; | |
572 | if (optlen >= sizeof(struct ip_mreqn)) { | |
573 | if (copy_from_user(&mreq,optval,sizeof(mreq))) | |
574 | break; | |
575 | } else { | |
576 | memset(&mreq, 0, sizeof(mreq)); | |
577 | if (optlen >= sizeof(struct in_addr) && | |
578 | copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr))) | |
579 | break; | |
580 | } | |
581 | ||
582 | if (!mreq.imr_ifindex) { | |
583 | if (mreq.imr_address.s_addr == INADDR_ANY) { | |
584 | inet->mc_index = 0; | |
585 | inet->mc_addr = 0; | |
586 | err = 0; | |
587 | break; | |
588 | } | |
589 | dev = ip_dev_find(mreq.imr_address.s_addr); | |
590 | if (dev) { | |
591 | mreq.imr_ifindex = dev->ifindex; | |
592 | dev_put(dev); | |
593 | } | |
594 | } else | |
595 | dev = __dev_get_by_index(mreq.imr_ifindex); | |
596 | ||
597 | ||
598 | err = -EADDRNOTAVAIL; | |
599 | if (!dev) | |
600 | break; | |
601 | ||
602 | err = -EINVAL; | |
603 | if (sk->sk_bound_dev_if && | |
604 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
605 | break; | |
606 | ||
607 | inet->mc_index = mreq.imr_ifindex; | |
608 | inet->mc_addr = mreq.imr_address.s_addr; | |
609 | err = 0; | |
610 | break; | |
611 | } | |
612 | ||
613 | case IP_ADD_MEMBERSHIP: | |
614 | case IP_DROP_MEMBERSHIP: | |
615 | { | |
616 | struct ip_mreqn mreq; | |
617 | ||
618 | if (optlen < sizeof(struct ip_mreq)) | |
619 | goto e_inval; | |
620 | err = -EFAULT; | |
621 | if (optlen >= sizeof(struct ip_mreqn)) { | |
622 | if(copy_from_user(&mreq,optval,sizeof(mreq))) | |
623 | break; | |
624 | } else { | |
625 | memset(&mreq, 0, sizeof(mreq)); | |
626 | if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq))) | |
627 | break; | |
628 | } | |
629 | ||
630 | if (optname == IP_ADD_MEMBERSHIP) | |
631 | err = ip_mc_join_group(sk, &mreq); | |
632 | else | |
633 | err = ip_mc_leave_group(sk, &mreq); | |
634 | break; | |
635 | } | |
636 | case IP_MSFILTER: | |
637 | { | |
1da177e4 LT |
638 | extern int sysctl_igmp_max_msf; |
639 | struct ip_msfilter *msf; | |
640 | ||
641 | if (optlen < IP_MSFILTER_SIZE(0)) | |
642 | goto e_inval; | |
643 | if (optlen > sysctl_optmem_max) { | |
644 | err = -ENOBUFS; | |
645 | break; | |
646 | } | |
8b3a7005 | 647 | msf = kmalloc(optlen, GFP_KERNEL); |
1da177e4 LT |
648 | if (msf == 0) { |
649 | err = -ENOBUFS; | |
650 | break; | |
651 | } | |
652 | err = -EFAULT; | |
653 | if (copy_from_user(msf, optval, optlen)) { | |
654 | kfree(msf); | |
655 | break; | |
656 | } | |
657 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
658 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
659 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
660 | kfree(msf); | |
661 | err = -ENOBUFS; | |
662 | break; | |
663 | } | |
664 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
665 | kfree(msf); | |
666 | err = -EINVAL; | |
667 | break; | |
668 | } | |
669 | err = ip_mc_msfilter(sk, msf, 0); | |
670 | kfree(msf); | |
671 | break; | |
672 | } | |
673 | case IP_BLOCK_SOURCE: | |
674 | case IP_UNBLOCK_SOURCE: | |
675 | case IP_ADD_SOURCE_MEMBERSHIP: | |
676 | case IP_DROP_SOURCE_MEMBERSHIP: | |
677 | { | |
678 | struct ip_mreq_source mreqs; | |
679 | int omode, add; | |
680 | ||
681 | if (optlen != sizeof(struct ip_mreq_source)) | |
682 | goto e_inval; | |
683 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
684 | err = -EFAULT; | |
685 | break; | |
686 | } | |
687 | if (optname == IP_BLOCK_SOURCE) { | |
688 | omode = MCAST_EXCLUDE; | |
689 | add = 1; | |
690 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
691 | omode = MCAST_EXCLUDE; | |
692 | add = 0; | |
693 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
694 | struct ip_mreqn mreq; | |
695 | ||
696 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; | |
697 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
698 | mreq.imr_ifindex = 0; | |
699 | err = ip_mc_join_group(sk, &mreq); | |
8cdaaa15 | 700 | if (err && err != -EADDRINUSE) |
1da177e4 LT |
701 | break; |
702 | omode = MCAST_INCLUDE; | |
703 | add = 1; | |
8cdaaa15 | 704 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { |
1da177e4 LT |
705 | omode = MCAST_INCLUDE; |
706 | add = 0; | |
707 | } | |
708 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
709 | break; | |
710 | } | |
711 | case MCAST_JOIN_GROUP: | |
712 | case MCAST_LEAVE_GROUP: | |
713 | { | |
714 | struct group_req greq; | |
715 | struct sockaddr_in *psin; | |
716 | struct ip_mreqn mreq; | |
717 | ||
718 | if (optlen < sizeof(struct group_req)) | |
719 | goto e_inval; | |
720 | err = -EFAULT; | |
721 | if(copy_from_user(&greq, optval, sizeof(greq))) | |
722 | break; | |
723 | psin = (struct sockaddr_in *)&greq.gr_group; | |
724 | if (psin->sin_family != AF_INET) | |
725 | goto e_inval; | |
726 | memset(&mreq, 0, sizeof(mreq)); | |
727 | mreq.imr_multiaddr = psin->sin_addr; | |
728 | mreq.imr_ifindex = greq.gr_interface; | |
729 | ||
730 | if (optname == MCAST_JOIN_GROUP) | |
731 | err = ip_mc_join_group(sk, &mreq); | |
732 | else | |
733 | err = ip_mc_leave_group(sk, &mreq); | |
734 | break; | |
735 | } | |
736 | case MCAST_JOIN_SOURCE_GROUP: | |
737 | case MCAST_LEAVE_SOURCE_GROUP: | |
738 | case MCAST_BLOCK_SOURCE: | |
739 | case MCAST_UNBLOCK_SOURCE: | |
740 | { | |
741 | struct group_source_req greqs; | |
742 | struct ip_mreq_source mreqs; | |
743 | struct sockaddr_in *psin; | |
744 | int omode, add; | |
745 | ||
746 | if (optlen != sizeof(struct group_source_req)) | |
747 | goto e_inval; | |
748 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
749 | err = -EFAULT; | |
750 | break; | |
751 | } | |
752 | if (greqs.gsr_group.ss_family != AF_INET || | |
753 | greqs.gsr_source.ss_family != AF_INET) { | |
754 | err = -EADDRNOTAVAIL; | |
755 | break; | |
756 | } | |
757 | psin = (struct sockaddr_in *)&greqs.gsr_group; | |
758 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
759 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
760 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
761 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
762 | ||
763 | if (optname == MCAST_BLOCK_SOURCE) { | |
764 | omode = MCAST_EXCLUDE; | |
765 | add = 1; | |
766 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
767 | omode = MCAST_EXCLUDE; | |
768 | add = 0; | |
769 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
770 | struct ip_mreqn mreq; | |
771 | ||
772 | psin = (struct sockaddr_in *)&greqs.gsr_group; | |
773 | mreq.imr_multiaddr = psin->sin_addr; | |
774 | mreq.imr_address.s_addr = 0; | |
775 | mreq.imr_ifindex = greqs.gsr_interface; | |
776 | err = ip_mc_join_group(sk, &mreq); | |
8cdaaa15 | 777 | if (err && err != -EADDRINUSE) |
1da177e4 LT |
778 | break; |
779 | greqs.gsr_interface = mreq.imr_ifindex; | |
780 | omode = MCAST_INCLUDE; | |
781 | add = 1; | |
782 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
783 | omode = MCAST_INCLUDE; | |
784 | add = 0; | |
785 | } | |
786 | err = ip_mc_source(add, omode, sk, &mreqs, | |
787 | greqs.gsr_interface); | |
788 | break; | |
789 | } | |
790 | case MCAST_MSFILTER: | |
791 | { | |
1da177e4 LT |
792 | extern int sysctl_igmp_max_msf; |
793 | struct sockaddr_in *psin; | |
794 | struct ip_msfilter *msf = NULL; | |
795 | struct group_filter *gsf = NULL; | |
796 | int msize, i, ifindex; | |
797 | ||
798 | if (optlen < GROUP_FILTER_SIZE(0)) | |
799 | goto e_inval; | |
800 | if (optlen > sysctl_optmem_max) { | |
801 | err = -ENOBUFS; | |
802 | break; | |
803 | } | |
8b3a7005 | 804 | gsf = kmalloc(optlen,GFP_KERNEL); |
1da177e4 LT |
805 | if (gsf == 0) { |
806 | err = -ENOBUFS; | |
807 | break; | |
808 | } | |
809 | err = -EFAULT; | |
810 | if (copy_from_user(gsf, optval, optlen)) { | |
811 | goto mc_msf_out; | |
812 | } | |
813 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ | |
814 | if (gsf->gf_numsrc >= 0x1ffffff || | |
815 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
816 | err = -ENOBUFS; | |
817 | goto mc_msf_out; | |
818 | } | |
819 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
820 | err = -EINVAL; | |
821 | goto mc_msf_out; | |
822 | } | |
823 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
8b3a7005 | 824 | msf = kmalloc(msize,GFP_KERNEL); |
1da177e4 LT |
825 | if (msf == 0) { |
826 | err = -ENOBUFS; | |
827 | goto mc_msf_out; | |
828 | } | |
829 | ifindex = gsf->gf_interface; | |
830 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
831 | if (psin->sin_family != AF_INET) { | |
832 | err = -EADDRNOTAVAIL; | |
833 | goto mc_msf_out; | |
834 | } | |
835 | msf->imsf_multiaddr = psin->sin_addr.s_addr; | |
836 | msf->imsf_interface = 0; | |
837 | msf->imsf_fmode = gsf->gf_fmode; | |
838 | msf->imsf_numsrc = gsf->gf_numsrc; | |
839 | err = -EADDRNOTAVAIL; | |
840 | for (i=0; i<gsf->gf_numsrc; ++i) { | |
841 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; | |
842 | ||
843 | if (psin->sin_family != AF_INET) | |
844 | goto mc_msf_out; | |
845 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
846 | } | |
847 | kfree(gsf); | |
848 | gsf = NULL; | |
849 | ||
850 | err = ip_mc_msfilter(sk, msf, ifindex); | |
851 | mc_msf_out: | |
a51482bd JJ |
852 | kfree(msf); |
853 | kfree(gsf); | |
1da177e4 LT |
854 | break; |
855 | } | |
856 | case IP_ROUTER_ALERT: | |
857 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
858 | break; | |
859 | ||
860 | case IP_FREEBIND: | |
861 | if (optlen<1) | |
862 | goto e_inval; | |
863 | inet->freebind = !!val; | |
864 | break; | |
865 | ||
866 | case IP_IPSEC_POLICY: | |
867 | case IP_XFRM_POLICY: | |
6fc0b4a7 HX |
868 | err = -EPERM; |
869 | if (!capable(CAP_NET_ADMIN)) | |
870 | break; | |
1da177e4 LT |
871 | err = xfrm_user_policy(sk, optname, optval, optlen); |
872 | break; | |
873 | ||
874 | default: | |
1da177e4 | 875 | err = -ENOPROTOOPT; |
1da177e4 LT |
876 | break; |
877 | } | |
878 | release_sock(sk); | |
879 | return err; | |
880 | ||
881 | e_inval: | |
882 | release_sock(sk); | |
883 | return -EINVAL; | |
884 | } | |
885 | ||
3fdadf7d DM |
886 | int ip_setsockopt(struct sock *sk, int level, |
887 | int optname, char __user *optval, int optlen) | |
888 | { | |
889 | int err; | |
890 | ||
891 | if (level != SOL_IP) | |
892 | return -ENOPROTOOPT; | |
893 | ||
894 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
895 | #ifdef CONFIG_NETFILTER | |
896 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
897 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
898 | optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY | |
899 | #ifdef CONFIG_IP_MROUTE | |
900 | && (optname < MRT_BASE || optname > (MRT_BASE + 10)) | |
901 | #endif | |
902 | ) { | |
903 | lock_sock(sk); | |
904 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
905 | release_sock(sk); | |
906 | } | |
907 | #endif | |
908 | return err; | |
909 | } | |
910 | ||
911 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
912 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
913 | char __user *optval, int optlen) | |
3fdadf7d DM |
914 | { |
915 | int err; | |
916 | ||
917 | if (level != SOL_IP) | |
918 | return -ENOPROTOOPT; | |
919 | ||
920 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
921 | #ifdef CONFIG_NETFILTER | |
922 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
923 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
543d9cfe | 924 | optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY |
3fdadf7d | 925 | #ifdef CONFIG_IP_MROUTE |
543d9cfe | 926 | && (optname < MRT_BASE || optname > (MRT_BASE + 10)) |
3fdadf7d DM |
927 | #endif |
928 | ) { | |
929 | lock_sock(sk); | |
543d9cfe ACM |
930 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
931 | optval, optlen); | |
3fdadf7d DM |
932 | release_sock(sk); |
933 | } | |
934 | #endif | |
935 | return err; | |
936 | } | |
543d9cfe ACM |
937 | |
938 | EXPORT_SYMBOL(compat_ip_setsockopt); | |
3fdadf7d DM |
939 | #endif |
940 | ||
1da177e4 LT |
941 | /* |
942 | * Get the options. Note for future reference. The GET of IP options gets the | |
943 | * _received_ ones. The set sets the _sent_ ones. | |
944 | */ | |
945 | ||
3fdadf7d DM |
946 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
947 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
948 | { |
949 | struct inet_sock *inet = inet_sk(sk); | |
950 | int val; | |
951 | int len; | |
952 | ||
953 | if(level!=SOL_IP) | |
954 | return -EOPNOTSUPP; | |
955 | ||
956 | #ifdef CONFIG_IP_MROUTE | |
957 | if(optname>=MRT_BASE && optname <=MRT_BASE+10) | |
958 | { | |
959 | return ip_mroute_getsockopt(sk,optname,optval,optlen); | |
960 | } | |
961 | #endif | |
962 | ||
963 | if(get_user(len,optlen)) | |
964 | return -EFAULT; | |
965 | if(len < 0) | |
966 | return -EINVAL; | |
967 | ||
968 | lock_sock(sk); | |
969 | ||
970 | switch(optname) { | |
971 | case IP_OPTIONS: | |
972 | { | |
973 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
974 | struct ip_options * opt = (struct ip_options*)optbuf; | |
975 | opt->optlen = 0; | |
976 | if (inet->opt) | |
977 | memcpy(optbuf, inet->opt, | |
978 | sizeof(struct ip_options)+ | |
979 | inet->opt->optlen); | |
980 | release_sock(sk); | |
981 | ||
982 | if (opt->optlen == 0) | |
983 | return put_user(0, optlen); | |
984 | ||
985 | ip_options_undo(opt); | |
986 | ||
987 | len = min_t(unsigned int, len, opt->optlen); | |
988 | if(put_user(len, optlen)) | |
989 | return -EFAULT; | |
990 | if(copy_to_user(optval, opt->__data, len)) | |
991 | return -EFAULT; | |
992 | return 0; | |
993 | } | |
994 | case IP_PKTINFO: | |
995 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
996 | break; | |
997 | case IP_RECVTTL: | |
998 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
999 | break; | |
1000 | case IP_RECVTOS: | |
1001 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1002 | break; | |
1003 | case IP_RECVOPTS: | |
1004 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1005 | break; | |
1006 | case IP_RETOPTS: | |
1007 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1008 | break; | |
2c7946a7 CZ |
1009 | case IP_PASSSEC: |
1010 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1011 | break; | |
1da177e4 LT |
1012 | case IP_TOS: |
1013 | val = inet->tos; | |
1014 | break; | |
1015 | case IP_TTL: | |
1016 | val = (inet->uc_ttl == -1 ? | |
1017 | sysctl_ip_default_ttl : | |
1018 | inet->uc_ttl); | |
1019 | break; | |
1020 | case IP_HDRINCL: | |
1021 | val = inet->hdrincl; | |
1022 | break; | |
1023 | case IP_MTU_DISCOVER: | |
1024 | val = inet->pmtudisc; | |
1025 | break; | |
1026 | case IP_MTU: | |
1027 | { | |
1028 | struct dst_entry *dst; | |
1029 | val = 0; | |
1030 | dst = sk_dst_get(sk); | |
1031 | if (dst) { | |
1032 | val = dst_mtu(dst); | |
1033 | dst_release(dst); | |
1034 | } | |
1035 | if (!val) { | |
1036 | release_sock(sk); | |
1037 | return -ENOTCONN; | |
1038 | } | |
1039 | break; | |
1040 | } | |
1041 | case IP_RECVERR: | |
1042 | val = inet->recverr; | |
1043 | break; | |
1044 | case IP_MULTICAST_TTL: | |
1045 | val = inet->mc_ttl; | |
1046 | break; | |
1047 | case IP_MULTICAST_LOOP: | |
1048 | val = inet->mc_loop; | |
1049 | break; | |
1050 | case IP_MULTICAST_IF: | |
1051 | { | |
1052 | struct in_addr addr; | |
1053 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1054 | addr.s_addr = inet->mc_addr; | |
1055 | release_sock(sk); | |
1056 | ||
1057 | if(put_user(len, optlen)) | |
1058 | return -EFAULT; | |
1059 | if(copy_to_user(optval, &addr, len)) | |
1060 | return -EFAULT; | |
1061 | return 0; | |
1062 | } | |
1063 | case IP_MSFILTER: | |
1064 | { | |
1065 | struct ip_msfilter msf; | |
1066 | int err; | |
1067 | ||
1068 | if (len < IP_MSFILTER_SIZE(0)) { | |
1069 | release_sock(sk); | |
1070 | return -EINVAL; | |
1071 | } | |
1072 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { | |
1073 | release_sock(sk); | |
1074 | return -EFAULT; | |
1075 | } | |
1076 | err = ip_mc_msfget(sk, &msf, | |
1077 | (struct ip_msfilter __user *)optval, optlen); | |
1078 | release_sock(sk); | |
1079 | return err; | |
1080 | } | |
1081 | case MCAST_MSFILTER: | |
1082 | { | |
1083 | struct group_filter gsf; | |
1084 | int err; | |
1085 | ||
1086 | if (len < GROUP_FILTER_SIZE(0)) { | |
1087 | release_sock(sk); | |
1088 | return -EINVAL; | |
1089 | } | |
1090 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1091 | release_sock(sk); | |
1092 | return -EFAULT; | |
1093 | } | |
1094 | err = ip_mc_gsfget(sk, &gsf, | |
1095 | (struct group_filter __user *)optval, optlen); | |
1096 | release_sock(sk); | |
1097 | return err; | |
1098 | } | |
1099 | case IP_PKTOPTIONS: | |
1100 | { | |
1101 | struct msghdr msg; | |
1102 | ||
1103 | release_sock(sk); | |
1104 | ||
1105 | if (sk->sk_type != SOCK_STREAM) | |
1106 | return -ENOPROTOOPT; | |
1107 | ||
1108 | msg.msg_control = optval; | |
1109 | msg.msg_controllen = len; | |
1110 | msg.msg_flags = 0; | |
1111 | ||
1112 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { | |
1113 | struct in_pktinfo info; | |
1114 | ||
1115 | info.ipi_addr.s_addr = inet->rcv_saddr; | |
1116 | info.ipi_spec_dst.s_addr = inet->rcv_saddr; | |
1117 | info.ipi_ifindex = inet->mc_index; | |
1118 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1119 | } | |
1120 | if (inet->cmsg_flags & IP_CMSG_TTL) { | |
1121 | int hlim = inet->mc_ttl; | |
1122 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1123 | } | |
1124 | len -= msg.msg_controllen; | |
1125 | return put_user(len, optlen); | |
1126 | } | |
1127 | case IP_FREEBIND: | |
1128 | val = inet->freebind; | |
1129 | break; | |
1130 | default: | |
1da177e4 LT |
1131 | release_sock(sk); |
1132 | return -ENOPROTOOPT; | |
1da177e4 LT |
1133 | } |
1134 | release_sock(sk); | |
1135 | ||
1136 | if (len < sizeof(int) && len > 0 && val>=0 && val<255) { | |
1137 | unsigned char ucval = (unsigned char)val; | |
1138 | len = 1; | |
1139 | if(put_user(len, optlen)) | |
1140 | return -EFAULT; | |
1141 | if(copy_to_user(optval,&ucval,1)) | |
1142 | return -EFAULT; | |
1143 | } else { | |
1144 | len = min_t(unsigned int, sizeof(int), len); | |
1145 | if(put_user(len, optlen)) | |
1146 | return -EFAULT; | |
1147 | if(copy_to_user(optval,&val,len)) | |
1148 | return -EFAULT; | |
1149 | } | |
1150 | return 0; | |
1151 | } | |
1152 | ||
3fdadf7d DM |
1153 | int ip_getsockopt(struct sock *sk, int level, |
1154 | int optname, char __user *optval, int __user *optlen) | |
1155 | { | |
1156 | int err; | |
1157 | ||
1158 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); | |
1159 | #ifdef CONFIG_NETFILTER | |
1160 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1161 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS | |
1162 | #ifdef CONFIG_IP_MROUTE | |
1163 | && (optname < MRT_BASE || optname > MRT_BASE+10) | |
1164 | #endif | |
1165 | ) { | |
1166 | int len; | |
1167 | ||
1168 | if(get_user(len,optlen)) | |
1169 | return -EFAULT; | |
1170 | ||
1171 | lock_sock(sk); | |
1172 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1173 | &len); | |
1174 | release_sock(sk); | |
1175 | if (err >= 0) | |
1176 | err = put_user(len, optlen); | |
1177 | return err; | |
1178 | } | |
1179 | #endif | |
1180 | return err; | |
1181 | } | |
1182 | ||
1183 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1184 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1185 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1186 | { |
543d9cfe | 1187 | int err = do_ip_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1188 | #ifdef CONFIG_NETFILTER |
1189 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1190 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS | |
1191 | #ifdef CONFIG_IP_MROUTE | |
543d9cfe | 1192 | && (optname < MRT_BASE || optname > MRT_BASE+10) |
3fdadf7d DM |
1193 | #endif |
1194 | ) { | |
1195 | int len; | |
1196 | ||
543d9cfe | 1197 | if (get_user(len, optlen)) |
3fdadf7d DM |
1198 | return -EFAULT; |
1199 | ||
1200 | lock_sock(sk); | |
543d9cfe | 1201 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1202 | release_sock(sk); |
1203 | if (err >= 0) | |
1204 | err = put_user(len, optlen); | |
1205 | return err; | |
1206 | } | |
1207 | #endif | |
1208 | return err; | |
1209 | } | |
543d9cfe ACM |
1210 | |
1211 | EXPORT_SYMBOL(compat_ip_getsockopt); | |
3fdadf7d DM |
1212 | #endif |
1213 | ||
1da177e4 LT |
1214 | EXPORT_SYMBOL(ip_cmsg_recv); |
1215 | ||
1da177e4 LT |
1216 | EXPORT_SYMBOL(ip_getsockopt); |
1217 | EXPORT_SYMBOL(ip_setsockopt); |