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1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
3 | * operating system. INET is implemented using the BSD Socket |
4 | * interface as the means of communication with the user level. |
5 | * |
6 | * The IP to API glue. |
7 | * |
8 | * Authors: see ip.c |
9 | * |
10 | * Fixes: |
11 | * Many : Split from ip.c , see ip.c for history. |
12 | * Martin Mares : TOS setting fixed. |
13 | * Alan Cox : Fixed a couple of oopses in Martin's |
14 | * TOS tweaks. |
15 | * Mike McLagan : Routing by source |
16 | */ |
17 | |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> |
20 | #include <linux/mm.h> |
21 | #include <linux/skbuff.h> |
22 | #include <linux/ip.h> |
23 | #include <linux/icmp.h> |
24 | #include <linux/inetdevice.h> |
25 | #include <linux/netdevice.h> |
26 | #include <linux/slab.h> |
27 | #include <net/sock.h> |
28 | #include <net/ip.h> |
29 | #include <net/icmp.h> |
30 | #include <net/tcp_states.h> |
31 | #include <linux/udp.h> |
32 | #include <linux/igmp.h> |
33 | #include <linux/netfilter.h> |
34 | #include <linux/route.h> |
35 | #include <linux/mroute.h> |
36 | #include <net/route.h> |
37 | #include <net/xfrm.h> |
38 | #include <net/compat.h> |
39 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
40 | #include <net/transp_v6.h> |
41 | #endif |
42 | |
43 | #include <linux/errqueue.h> |
44 | #include <asm/uaccess.h> |
45 | |
46 | #define IP_CMSG_PKTINFO 1 |
47 | #define IP_CMSG_TTL 2 |
48 | #define IP_CMSG_TOS 4 |
49 | #define IP_CMSG_RECVOPTS 8 |
50 | #define IP_CMSG_RETOPTS 16 |
51 | #define IP_CMSG_PASSSEC 32 |
52 | #define IP_CMSG_ORIGDSTADDR 64 |
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 = skb_rtable(skb); |
62 | |
63 | info.ipi_addr.s_addr = ip_hdr(skb)->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 = ip_hdr(skb)->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, &ip_hdr(skb)->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, |
92 | ip_hdr(skb) + 1); |
93 | } |
94 | |
95 | |
96 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) |
97 | { |
98 | unsigned char optbuf[sizeof(struct ip_options) + 40]; |
99 | struct ip_options * opt = (struct ip_options *)optbuf; |
100 | |
101 | if (IPCB(skb)->opt.optlen == 0) |
102 | return; |
103 | |
104 | if (ip_options_echo(opt, skb)) { |
105 | msg->msg_flags |= MSG_CTRUNC; |
106 | return; |
107 | } |
108 | ip_options_undo(opt); |
109 | |
110 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); |
111 | } |
112 | |
113 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
114 | { |
115 | char *secdata; |
116 | u32 seclen, secid; |
117 | int err; |
118 | |
119 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
120 | if (err) |
121 | return; |
122 | |
123 | err = security_secid_to_secctx(secid, &secdata, &seclen); |
124 | if (err) |
125 | return; |
126 | |
127 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); |
128 | security_release_secctx(secdata, seclen); |
129 | } |
130 | |
131 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
132 | { |
133 | struct sockaddr_in sin; |
134 | struct iphdr *iph = ip_hdr(skb); |
135 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
136 | |
137 | if (skb_transport_offset(skb) + 4 > skb->len) |
138 | return; |
139 | |
140 | /* All current transport protocols have the port numbers in the |
141 | * first four bytes of the transport header and this function is |
142 | * written with this assumption in mind. |
143 | */ |
144 | |
145 | sin.sin_family = AF_INET; |
146 | sin.sin_addr.s_addr = iph->daddr; |
147 | sin.sin_port = ports[1]; |
148 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
149 | |
150 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); |
151 | } |
152 | |
153 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
154 | { |
155 | struct inet_sock *inet = inet_sk(skb->sk); |
156 | unsigned flags = inet->cmsg_flags; |
157 | |
158 | /* Ordered by supposed usage frequency */ |
159 | if (flags & 1) |
160 | ip_cmsg_recv_pktinfo(msg, skb); |
161 | if ((flags >>= 1) == 0) |
162 | return; |
163 | |
164 | if (flags & 1) |
165 | ip_cmsg_recv_ttl(msg, skb); |
166 | if ((flags >>= 1) == 0) |
167 | return; |
168 | |
169 | if (flags & 1) |
170 | ip_cmsg_recv_tos(msg, skb); |
171 | if ((flags >>= 1) == 0) |
172 | return; |
173 | |
174 | if (flags & 1) |
175 | ip_cmsg_recv_opts(msg, skb); |
176 | if ((flags >>= 1) == 0) |
177 | return; |
178 | |
179 | if (flags & 1) |
180 | ip_cmsg_recv_retopts(msg, skb); |
181 | if ((flags >>= 1) == 0) |
182 | return; |
183 | |
184 | if (flags & 1) |
185 | ip_cmsg_recv_security(msg, skb); |
186 | |
187 | if ((flags >>= 1) == 0) |
188 | return; |
189 | if (flags & 1) |
190 | ip_cmsg_recv_dstaddr(msg, skb); |
191 | |
192 | } |
193 | EXPORT_SYMBOL(ip_cmsg_recv); |
194 | |
195 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
196 | { |
197 | int err; |
198 | struct cmsghdr *cmsg; |
199 | |
200 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
201 | if (!CMSG_OK(msg, cmsg)) |
202 | return -EINVAL; |
203 | if (cmsg->cmsg_level != SOL_IP) |
204 | continue; |
205 | switch (cmsg->cmsg_type) { |
206 | case IP_RETOPTS: |
207 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); |
208 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
209 | err < 40 ? err : 40); |
210 | if (err) |
211 | return err; |
212 | break; |
213 | case IP_PKTINFO: |
214 | { |
215 | struct in_pktinfo *info; |
216 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) |
217 | return -EINVAL; |
218 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); |
219 | ipc->oif = info->ipi_ifindex; |
220 | ipc->addr = info->ipi_spec_dst.s_addr; |
221 | break; |
222 | } |
223 | default: |
224 | return -EINVAL; |
225 | } |
226 | } |
227 | return 0; |
228 | } |
229 | |
230 | |
231 | /* Special input handler for packets caught by router alert option. |
232 | They are selected only by protocol field, and then processed likely |
233 | local ones; but only if someone wants them! Otherwise, router |
234 | not running rsvpd will kill RSVP. |
235 | |
236 | It is user level problem, what it will make with them. |
237 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), |
238 | but receiver should be enough clever f.e. to forward mtrace requests, |
239 | sent to multicast group to reach destination designated router. |
240 | */ |
241 | struct ip_ra_chain __rcu *ip_ra_chain; |
242 | static DEFINE_SPINLOCK(ip_ra_lock); |
243 | |
244 | |
245 | static void ip_ra_destroy_rcu(struct rcu_head *head) |
246 | { |
247 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
248 | |
249 | sock_put(ra->saved_sk); |
250 | kfree(ra); |
251 | } |
252 | |
253 | int ip_ra_control(struct sock *sk, unsigned char on, |
254 | void (*destructor)(struct sock *)) |
255 | { |
256 | struct ip_ra_chain *ra, *new_ra; |
257 | struct ip_ra_chain __rcu **rap; |
258 | |
259 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
260 | return -EINVAL; |
261 | |
262 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; |
263 | |
264 | spin_lock_bh(&ip_ra_lock); |
265 | for (rap = &ip_ra_chain; |
266 | (ra = rcu_dereference_protected(*rap, |
267 | lockdep_is_held(&ip_ra_lock))) != NULL; |
268 | rap = &ra->next) { |
269 | if (ra->sk == sk) { |
270 | if (on) { |
271 | spin_unlock_bh(&ip_ra_lock); |
272 | kfree(new_ra); |
273 | return -EADDRINUSE; |
274 | } |
275 | /* dont let ip_call_ra_chain() use sk again */ |
276 | ra->sk = NULL; |
277 | rcu_assign_pointer(*rap, ra->next); |
278 | spin_unlock_bh(&ip_ra_lock); |
279 | |
280 | if (ra->destructor) |
281 | ra->destructor(sk); |
282 | /* |
283 | * Delay sock_put(sk) and kfree(ra) after one rcu grace |
284 | * period. This guarantee ip_call_ra_chain() dont need |
285 | * to mess with socket refcounts. |
286 | */ |
287 | ra->saved_sk = sk; |
288 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); |
289 | return 0; |
290 | } |
291 | } |
292 | if (new_ra == NULL) { |
293 | spin_unlock_bh(&ip_ra_lock); |
294 | return -ENOBUFS; |
295 | } |
296 | new_ra->sk = sk; |
297 | new_ra->destructor = destructor; |
298 | |
299 | new_ra->next = ra; |
300 | rcu_assign_pointer(*rap, new_ra); |
301 | sock_hold(sk); |
302 | spin_unlock_bh(&ip_ra_lock); |
303 | |
304 | return 0; |
305 | } |
306 | |
307 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
308 | __be16 port, u32 info, u8 *payload) |
309 | { |
310 | struct sock_exterr_skb *serr; |
311 | |
312 | skb = skb_clone(skb, GFP_ATOMIC); |
313 | if (!skb) |
314 | return; |
315 | |
316 | serr = SKB_EXT_ERR(skb); |
317 | serr->ee.ee_errno = err; |
318 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; |
319 | serr->ee.ee_type = icmp_hdr(skb)->type; |
320 | serr->ee.ee_code = icmp_hdr(skb)->code; |
321 | serr->ee.ee_pad = 0; |
322 | serr->ee.ee_info = info; |
323 | serr->ee.ee_data = 0; |
324 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
325 | skb_network_header(skb); |
326 | serr->port = port; |
327 | |
328 | if (skb_pull(skb, payload - skb->data) != NULL) { |
329 | skb_reset_transport_header(skb); |
330 | if (sock_queue_err_skb(sk, skb) == 0) |
331 | return; |
332 | } |
333 | kfree_skb(skb); |
334 | } |
335 | |
336 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
337 | { |
338 | struct inet_sock *inet = inet_sk(sk); |
339 | struct sock_exterr_skb *serr; |
340 | struct iphdr *iph; |
341 | struct sk_buff *skb; |
342 | |
343 | if (!inet->recverr) |
344 | return; |
345 | |
346 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); |
347 | if (!skb) |
348 | return; |
349 | |
350 | skb_put(skb, sizeof(struct iphdr)); |
351 | skb_reset_network_header(skb); |
352 | iph = ip_hdr(skb); |
353 | iph->daddr = daddr; |
354 | |
355 | serr = SKB_EXT_ERR(skb); |
356 | serr->ee.ee_errno = err; |
357 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
358 | serr->ee.ee_type = 0; |
359 | serr->ee.ee_code = 0; |
360 | serr->ee.ee_pad = 0; |
361 | serr->ee.ee_info = info; |
362 | serr->ee.ee_data = 0; |
363 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
364 | serr->port = port; |
365 | |
366 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
367 | skb_reset_transport_header(skb); |
368 | |
369 | if (sock_queue_err_skb(sk, skb)) |
370 | kfree_skb(skb); |
371 | } |
372 | |
373 | /* |
374 | * Handle MSG_ERRQUEUE |
375 | */ |
376 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) |
377 | { |
378 | struct sock_exterr_skb *serr; |
379 | struct sk_buff *skb, *skb2; |
380 | struct sockaddr_in *sin; |
381 | struct { |
382 | struct sock_extended_err ee; |
383 | struct sockaddr_in offender; |
384 | } errhdr; |
385 | int err; |
386 | int copied; |
387 | |
388 | err = -EAGAIN; |
389 | skb = skb_dequeue(&sk->sk_error_queue); |
390 | if (skb == NULL) |
391 | goto out; |
392 | |
393 | copied = skb->len; |
394 | if (copied > len) { |
395 | msg->msg_flags |= MSG_TRUNC; |
396 | copied = len; |
397 | } |
398 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
399 | if (err) |
400 | goto out_free_skb; |
401 | |
402 | sock_recv_timestamp(msg, sk, skb); |
403 | |
404 | serr = SKB_EXT_ERR(skb); |
405 | |
406 | sin = (struct sockaddr_in *)msg->msg_name; |
407 | if (sin) { |
408 | sin->sin_family = AF_INET; |
409 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
410 | serr->addr_offset); |
411 | sin->sin_port = serr->port; |
412 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
413 | } |
414 | |
415 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); |
416 | sin = &errhdr.offender; |
417 | sin->sin_family = AF_UNSPEC; |
418 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { |
419 | struct inet_sock *inet = inet_sk(sk); |
420 | |
421 | sin->sin_family = AF_INET; |
422 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
423 | sin->sin_port = 0; |
424 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
425 | if (inet->cmsg_flags) |
426 | ip_cmsg_recv(msg, skb); |
427 | } |
428 | |
429 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); |
430 | |
431 | /* Now we could try to dump offended packet options */ |
432 | |
433 | msg->msg_flags |= MSG_ERRQUEUE; |
434 | err = copied; |
435 | |
436 | /* Reset and regenerate socket error */ |
437 | spin_lock_bh(&sk->sk_error_queue.lock); |
438 | sk->sk_err = 0; |
439 | skb2 = skb_peek(&sk->sk_error_queue); |
440 | if (skb2 != NULL) { |
441 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
442 | spin_unlock_bh(&sk->sk_error_queue.lock); |
443 | sk->sk_error_report(sk); |
444 | } else |
445 | spin_unlock_bh(&sk->sk_error_queue.lock); |
446 | |
447 | out_free_skb: |
448 | kfree_skb(skb); |
449 | out: |
450 | return err; |
451 | } |
452 | |
453 | |
454 | /* |
455 | * Socket option code for IP. This is the end of the line after any |
456 | * TCP,UDP etc options on an IP socket. |
457 | */ |
458 | |
459 | static int do_ip_setsockopt(struct sock *sk, int level, |
460 | int optname, char __user *optval, unsigned int optlen) |
461 | { |
462 | struct inet_sock *inet = inet_sk(sk); |
463 | int val = 0, err; |
464 | |
465 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
466 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
467 | (1<<IP_RETOPTS) | (1<<IP_TOS) | |
468 | (1<<IP_TTL) | (1<<IP_HDRINCL) | |
469 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | |
470 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | |
471 | (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) | |
472 | (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) || |
473 | optname == IP_MULTICAST_TTL || |
474 | optname == IP_MULTICAST_ALL || |
475 | optname == IP_MULTICAST_LOOP || |
476 | optname == IP_RECVORIGDSTADDR) { |
477 | if (optlen >= sizeof(int)) { |
478 | if (get_user(val, (int __user *) optval)) |
479 | return -EFAULT; |
480 | } else if (optlen >= sizeof(char)) { |
481 | unsigned char ucval; |
482 | |
483 | if (get_user(ucval, (unsigned char __user *) optval)) |
484 | return -EFAULT; |
485 | val = (int) ucval; |
486 | } |
487 | } |
488 | |
489 | /* If optlen==0, it is equivalent to val == 0 */ |
490 | |
491 | if (ip_mroute_opt(optname)) |
492 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
493 | |
494 | err = 0; |
495 | lock_sock(sk); |
496 | |
497 | switch (optname) { |
498 | case IP_OPTIONS: |
499 | { |
500 | struct ip_options *opt = NULL; |
501 | if (optlen > 40) |
502 | goto e_inval; |
503 | err = ip_options_get_from_user(sock_net(sk), &opt, |
504 | optval, optlen); |
505 | if (err) |
506 | break; |
507 | if (inet->is_icsk) { |
508 | struct inet_connection_sock *icsk = inet_csk(sk); |
509 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
510 | if (sk->sk_family == PF_INET || |
511 | (!((1 << sk->sk_state) & |
512 | (TCPF_LISTEN | TCPF_CLOSE)) && |
513 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
514 | #endif |
515 | if (inet->opt) |
516 | icsk->icsk_ext_hdr_len -= inet->opt->optlen; |
517 | if (opt) |
518 | icsk->icsk_ext_hdr_len += opt->optlen; |
519 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
520 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
521 | } |
522 | #endif |
523 | } |
524 | opt = xchg(&inet->opt, opt); |
525 | kfree(opt); |
526 | break; |
527 | } |
528 | case IP_PKTINFO: |
529 | if (val) |
530 | inet->cmsg_flags |= IP_CMSG_PKTINFO; |
531 | else |
532 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; |
533 | break; |
534 | case IP_RECVTTL: |
535 | if (val) |
536 | inet->cmsg_flags |= IP_CMSG_TTL; |
537 | else |
538 | inet->cmsg_flags &= ~IP_CMSG_TTL; |
539 | break; |
540 | case IP_RECVTOS: |
541 | if (val) |
542 | inet->cmsg_flags |= IP_CMSG_TOS; |
543 | else |
544 | inet->cmsg_flags &= ~IP_CMSG_TOS; |
545 | break; |
546 | case IP_RECVOPTS: |
547 | if (val) |
548 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; |
549 | else |
550 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; |
551 | break; |
552 | case IP_RETOPTS: |
553 | if (val) |
554 | inet->cmsg_flags |= IP_CMSG_RETOPTS; |
555 | else |
556 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; |
557 | break; |
558 | case IP_PASSSEC: |
559 | if (val) |
560 | inet->cmsg_flags |= IP_CMSG_PASSSEC; |
561 | else |
562 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; |
563 | break; |
564 | case IP_RECVORIGDSTADDR: |
565 | if (val) |
566 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; |
567 | else |
568 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; |
569 | break; |
570 | case IP_TOS: /* This sets both TOS and Precedence */ |
571 | if (sk->sk_type == SOCK_STREAM) { |
572 | val &= ~3; |
573 | val |= inet->tos & 3; |
574 | } |
575 | if (inet->tos != val) { |
576 | inet->tos = val; |
577 | sk->sk_priority = rt_tos2priority(val); |
578 | sk_dst_reset(sk); |
579 | } |
580 | break; |
581 | case IP_TTL: |
582 | if (optlen < 1) |
583 | goto e_inval; |
584 | if (val != -1 && (val < 0 || val > 255)) |
585 | goto e_inval; |
586 | inet->uc_ttl = val; |
587 | break; |
588 | case IP_HDRINCL: |
589 | if (sk->sk_type != SOCK_RAW) { |
590 | err = -ENOPROTOOPT; |
591 | break; |
592 | } |
593 | inet->hdrincl = val ? 1 : 0; |
594 | break; |
595 | case IP_NODEFRAG: |
596 | if (sk->sk_type != SOCK_RAW) { |
597 | err = -ENOPROTOOPT; |
598 | break; |
599 | } |
600 | inet->nodefrag = val ? 1 : 0; |
601 | break; |
602 | case IP_MTU_DISCOVER: |
603 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
604 | goto e_inval; |
605 | inet->pmtudisc = val; |
606 | break; |
607 | case IP_RECVERR: |
608 | inet->recverr = !!val; |
609 | if (!val) |
610 | skb_queue_purge(&sk->sk_error_queue); |
611 | break; |
612 | case IP_MULTICAST_TTL: |
613 | if (sk->sk_type == SOCK_STREAM) |
614 | goto e_inval; |
615 | if (optlen < 1) |
616 | goto e_inval; |
617 | if (val == -1) |
618 | val = 1; |
619 | if (val < 0 || val > 255) |
620 | goto e_inval; |
621 | inet->mc_ttl = val; |
622 | break; |
623 | case IP_MULTICAST_LOOP: |
624 | if (optlen < 1) |
625 | goto e_inval; |
626 | inet->mc_loop = !!val; |
627 | break; |
628 | case IP_MULTICAST_IF: |
629 | { |
630 | struct ip_mreqn mreq; |
631 | struct net_device *dev = NULL; |
632 | |
633 | if (sk->sk_type == SOCK_STREAM) |
634 | goto e_inval; |
635 | /* |
636 | * Check the arguments are allowable |
637 | */ |
638 | |
639 | if (optlen < sizeof(struct in_addr)) |
640 | goto e_inval; |
641 | |
642 | err = -EFAULT; |
643 | if (optlen >= sizeof(struct ip_mreqn)) { |
644 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
645 | break; |
646 | } else { |
647 | memset(&mreq, 0, sizeof(mreq)); |
648 | if (optlen >= sizeof(struct in_addr) && |
649 | copy_from_user(&mreq.imr_address, optval, |
650 | sizeof(struct in_addr))) |
651 | break; |
652 | } |
653 | |
654 | if (!mreq.imr_ifindex) { |
655 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
656 | inet->mc_index = 0; |
657 | inet->mc_addr = 0; |
658 | err = 0; |
659 | break; |
660 | } |
661 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
662 | if (dev) |
663 | mreq.imr_ifindex = dev->ifindex; |
664 | } else |
665 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
666 | |
667 | |
668 | err = -EADDRNOTAVAIL; |
669 | if (!dev) |
670 | break; |
671 | dev_put(dev); |
672 | |
673 | err = -EINVAL; |
674 | if (sk->sk_bound_dev_if && |
675 | mreq.imr_ifindex != sk->sk_bound_dev_if) |
676 | break; |
677 | |
678 | inet->mc_index = mreq.imr_ifindex; |
679 | inet->mc_addr = mreq.imr_address.s_addr; |
680 | err = 0; |
681 | break; |
682 | } |
683 | |
684 | case IP_ADD_MEMBERSHIP: |
685 | case IP_DROP_MEMBERSHIP: |
686 | { |
687 | struct ip_mreqn mreq; |
688 | |
689 | err = -EPROTO; |
690 | if (inet_sk(sk)->is_icsk) |
691 | break; |
692 | |
693 | if (optlen < sizeof(struct ip_mreq)) |
694 | goto e_inval; |
695 | err = -EFAULT; |
696 | if (optlen >= sizeof(struct ip_mreqn)) { |
697 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
698 | break; |
699 | } else { |
700 | memset(&mreq, 0, sizeof(mreq)); |
701 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
702 | break; |
703 | } |
704 | |
705 | if (optname == IP_ADD_MEMBERSHIP) |
706 | err = ip_mc_join_group(sk, &mreq); |
707 | else |
708 | err = ip_mc_leave_group(sk, &mreq); |
709 | break; |
710 | } |
711 | case IP_MSFILTER: |
712 | { |
713 | struct ip_msfilter *msf; |
714 | |
715 | if (optlen < IP_MSFILTER_SIZE(0)) |
716 | goto e_inval; |
717 | if (optlen > sysctl_optmem_max) { |
718 | err = -ENOBUFS; |
719 | break; |
720 | } |
721 | msf = kmalloc(optlen, GFP_KERNEL); |
722 | if (!msf) { |
723 | err = -ENOBUFS; |
724 | break; |
725 | } |
726 | err = -EFAULT; |
727 | if (copy_from_user(msf, optval, optlen)) { |
728 | kfree(msf); |
729 | break; |
730 | } |
731 | /* numsrc >= (1G-4) overflow in 32 bits */ |
732 | if (msf->imsf_numsrc >= 0x3ffffffcU || |
733 | msf->imsf_numsrc > sysctl_igmp_max_msf) { |
734 | kfree(msf); |
735 | err = -ENOBUFS; |
736 | break; |
737 | } |
738 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { |
739 | kfree(msf); |
740 | err = -EINVAL; |
741 | break; |
742 | } |
743 | err = ip_mc_msfilter(sk, msf, 0); |
744 | kfree(msf); |
745 | break; |
746 | } |
747 | case IP_BLOCK_SOURCE: |
748 | case IP_UNBLOCK_SOURCE: |
749 | case IP_ADD_SOURCE_MEMBERSHIP: |
750 | case IP_DROP_SOURCE_MEMBERSHIP: |
751 | { |
752 | struct ip_mreq_source mreqs; |
753 | int omode, add; |
754 | |
755 | if (optlen != sizeof(struct ip_mreq_source)) |
756 | goto e_inval; |
757 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { |
758 | err = -EFAULT; |
759 | break; |
760 | } |
761 | if (optname == IP_BLOCK_SOURCE) { |
762 | omode = MCAST_EXCLUDE; |
763 | add = 1; |
764 | } else if (optname == IP_UNBLOCK_SOURCE) { |
765 | omode = MCAST_EXCLUDE; |
766 | add = 0; |
767 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { |
768 | struct ip_mreqn mreq; |
769 | |
770 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
771 | mreq.imr_address.s_addr = mreqs.imr_interface; |
772 | mreq.imr_ifindex = 0; |
773 | err = ip_mc_join_group(sk, &mreq); |
774 | if (err && err != -EADDRINUSE) |
775 | break; |
776 | omode = MCAST_INCLUDE; |
777 | add = 1; |
778 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { |
779 | omode = MCAST_INCLUDE; |
780 | add = 0; |
781 | } |
782 | err = ip_mc_source(add, omode, sk, &mreqs, 0); |
783 | break; |
784 | } |
785 | case MCAST_JOIN_GROUP: |
786 | case MCAST_LEAVE_GROUP: |
787 | { |
788 | struct group_req greq; |
789 | struct sockaddr_in *psin; |
790 | struct ip_mreqn mreq; |
791 | |
792 | if (optlen < sizeof(struct group_req)) |
793 | goto e_inval; |
794 | err = -EFAULT; |
795 | if (copy_from_user(&greq, optval, sizeof(greq))) |
796 | break; |
797 | psin = (struct sockaddr_in *)&greq.gr_group; |
798 | if (psin->sin_family != AF_INET) |
799 | goto e_inval; |
800 | memset(&mreq, 0, sizeof(mreq)); |
801 | mreq.imr_multiaddr = psin->sin_addr; |
802 | mreq.imr_ifindex = greq.gr_interface; |
803 | |
804 | if (optname == MCAST_JOIN_GROUP) |
805 | err = ip_mc_join_group(sk, &mreq); |
806 | else |
807 | err = ip_mc_leave_group(sk, &mreq); |
808 | break; |
809 | } |
810 | case MCAST_JOIN_SOURCE_GROUP: |
811 | case MCAST_LEAVE_SOURCE_GROUP: |
812 | case MCAST_BLOCK_SOURCE: |
813 | case MCAST_UNBLOCK_SOURCE: |
814 | { |
815 | struct group_source_req greqs; |
816 | struct ip_mreq_source mreqs; |
817 | struct sockaddr_in *psin; |
818 | int omode, add; |
819 | |
820 | if (optlen != sizeof(struct group_source_req)) |
821 | goto e_inval; |
822 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { |
823 | err = -EFAULT; |
824 | break; |
825 | } |
826 | if (greqs.gsr_group.ss_family != AF_INET || |
827 | greqs.gsr_source.ss_family != AF_INET) { |
828 | err = -EADDRNOTAVAIL; |
829 | break; |
830 | } |
831 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
832 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; |
833 | psin = (struct sockaddr_in *)&greqs.gsr_source; |
834 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; |
835 | mreqs.imr_interface = 0; /* use index for mc_source */ |
836 | |
837 | if (optname == MCAST_BLOCK_SOURCE) { |
838 | omode = MCAST_EXCLUDE; |
839 | add = 1; |
840 | } else if (optname == MCAST_UNBLOCK_SOURCE) { |
841 | omode = MCAST_EXCLUDE; |
842 | add = 0; |
843 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { |
844 | struct ip_mreqn mreq; |
845 | |
846 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
847 | mreq.imr_multiaddr = psin->sin_addr; |
848 | mreq.imr_address.s_addr = 0; |
849 | mreq.imr_ifindex = greqs.gsr_interface; |
850 | err = ip_mc_join_group(sk, &mreq); |
851 | if (err && err != -EADDRINUSE) |
852 | break; |
853 | greqs.gsr_interface = mreq.imr_ifindex; |
854 | omode = MCAST_INCLUDE; |
855 | add = 1; |
856 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { |
857 | omode = MCAST_INCLUDE; |
858 | add = 0; |
859 | } |
860 | err = ip_mc_source(add, omode, sk, &mreqs, |
861 | greqs.gsr_interface); |
862 | break; |
863 | } |
864 | case MCAST_MSFILTER: |
865 | { |
866 | struct sockaddr_in *psin; |
867 | struct ip_msfilter *msf = NULL; |
868 | struct group_filter *gsf = NULL; |
869 | int msize, i, ifindex; |
870 | |
871 | if (optlen < GROUP_FILTER_SIZE(0)) |
872 | goto e_inval; |
873 | if (optlen > sysctl_optmem_max) { |
874 | err = -ENOBUFS; |
875 | break; |
876 | } |
877 | gsf = kmalloc(optlen, GFP_KERNEL); |
878 | if (!gsf) { |
879 | err = -ENOBUFS; |
880 | break; |
881 | } |
882 | err = -EFAULT; |
883 | if (copy_from_user(gsf, optval, optlen)) |
884 | goto mc_msf_out; |
885 | |
886 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
887 | if (gsf->gf_numsrc >= 0x1ffffff || |
888 | gsf->gf_numsrc > sysctl_igmp_max_msf) { |
889 | err = -ENOBUFS; |
890 | goto mc_msf_out; |
891 | } |
892 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { |
893 | err = -EINVAL; |
894 | goto mc_msf_out; |
895 | } |
896 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); |
897 | msf = kmalloc(msize, GFP_KERNEL); |
898 | if (!msf) { |
899 | err = -ENOBUFS; |
900 | goto mc_msf_out; |
901 | } |
902 | ifindex = gsf->gf_interface; |
903 | psin = (struct sockaddr_in *)&gsf->gf_group; |
904 | if (psin->sin_family != AF_INET) { |
905 | err = -EADDRNOTAVAIL; |
906 | goto mc_msf_out; |
907 | } |
908 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
909 | msf->imsf_interface = 0; |
910 | msf->imsf_fmode = gsf->gf_fmode; |
911 | msf->imsf_numsrc = gsf->gf_numsrc; |
912 | err = -EADDRNOTAVAIL; |
913 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
914 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
915 | |
916 | if (psin->sin_family != AF_INET) |
917 | goto mc_msf_out; |
918 | msf->imsf_slist[i] = psin->sin_addr.s_addr; |
919 | } |
920 | kfree(gsf); |
921 | gsf = NULL; |
922 | |
923 | err = ip_mc_msfilter(sk, msf, ifindex); |
924 | mc_msf_out: |
925 | kfree(msf); |
926 | kfree(gsf); |
927 | break; |
928 | } |
929 | case IP_MULTICAST_ALL: |
930 | if (optlen < 1) |
931 | goto e_inval; |
932 | if (val != 0 && val != 1) |
933 | goto e_inval; |
934 | inet->mc_all = val; |
935 | break; |
936 | case IP_ROUTER_ALERT: |
937 | err = ip_ra_control(sk, val ? 1 : 0, NULL); |
938 | break; |
939 | |
940 | case IP_FREEBIND: |
941 | if (optlen < 1) |
942 | goto e_inval; |
943 | inet->freebind = !!val; |
944 | break; |
945 | |
946 | case IP_IPSEC_POLICY: |
947 | case IP_XFRM_POLICY: |
948 | err = -EPERM; |
949 | if (!capable(CAP_NET_ADMIN)) |
950 | break; |
951 | err = xfrm_user_policy(sk, optname, optval, optlen); |
952 | break; |
953 | |
954 | case IP_TRANSPARENT: |
955 | if (!capable(CAP_NET_ADMIN)) { |
956 | err = -EPERM; |
957 | break; |
958 | } |
959 | if (optlen < 1) |
960 | goto e_inval; |
961 | inet->transparent = !!val; |
962 | break; |
963 | |
964 | case IP_MINTTL: |
965 | if (optlen < 1) |
966 | goto e_inval; |
967 | if (val < 0 || val > 255) |
968 | goto e_inval; |
969 | inet->min_ttl = val; |
970 | break; |
971 | |
972 | default: |
973 | err = -ENOPROTOOPT; |
974 | break; |
975 | } |
976 | release_sock(sk); |
977 | return err; |
978 | |
979 | e_inval: |
980 | release_sock(sk); |
981 | return -EINVAL; |
982 | } |
983 | |
984 | /** |
985 | * ip_queue_rcv_skb - Queue an skb into sock receive queue |
986 | * @sk: socket |
987 | * @skb: buffer |
988 | * |
989 | * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option |
990 | * is not set, we drop skb dst entry now, while dst cache line is hot. |
991 | */ |
992 | int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
993 | { |
994 | if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO)) |
995 | skb_dst_drop(skb); |
996 | return sock_queue_rcv_skb(sk, skb); |
997 | } |
998 | EXPORT_SYMBOL(ip_queue_rcv_skb); |
999 | |
1000 | int ip_setsockopt(struct sock *sk, int level, |
1001 | int optname, char __user *optval, unsigned int optlen) |
1002 | { |
1003 | int err; |
1004 | |
1005 | if (level != SOL_IP) |
1006 | return -ENOPROTOOPT; |
1007 | |
1008 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1009 | #ifdef CONFIG_NETFILTER |
1010 | /* we need to exclude all possible ENOPROTOOPTs except default case */ |
1011 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && |
1012 | optname != IP_IPSEC_POLICY && |
1013 | optname != IP_XFRM_POLICY && |
1014 | !ip_mroute_opt(optname)) { |
1015 | lock_sock(sk); |
1016 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
1017 | release_sock(sk); |
1018 | } |
1019 | #endif |
1020 | return err; |
1021 | } |
1022 | EXPORT_SYMBOL(ip_setsockopt); |
1023 | |
1024 | #ifdef CONFIG_COMPAT |
1025 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
1026 | char __user *optval, unsigned int optlen) |
1027 | { |
1028 | int err; |
1029 | |
1030 | if (level != SOL_IP) |
1031 | return -ENOPROTOOPT; |
1032 | |
1033 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1034 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, |
1035 | ip_setsockopt); |
1036 | |
1037 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1038 | #ifdef CONFIG_NETFILTER |
1039 | /* we need to exclude all possible ENOPROTOOPTs except default case */ |
1040 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && |
1041 | optname != IP_IPSEC_POLICY && |
1042 | optname != IP_XFRM_POLICY && |
1043 | !ip_mroute_opt(optname)) { |
1044 | lock_sock(sk); |
1045 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1046 | optval, optlen); |
1047 | release_sock(sk); |
1048 | } |
1049 | #endif |
1050 | return err; |
1051 | } |
1052 | EXPORT_SYMBOL(compat_ip_setsockopt); |
1053 | #endif |
1054 | |
1055 | /* |
1056 | * Get the options. Note for future reference. The GET of IP options gets |
1057 | * the _received_ ones. The set sets the _sent_ ones. |
1058 | */ |
1059 | |
1060 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
1061 | char __user *optval, int __user *optlen) |
1062 | { |
1063 | struct inet_sock *inet = inet_sk(sk); |
1064 | int val; |
1065 | int len; |
1066 | |
1067 | if (level != SOL_IP) |
1068 | return -EOPNOTSUPP; |
1069 | |
1070 | if (ip_mroute_opt(optname)) |
1071 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1072 | |
1073 | if (get_user(len, optlen)) |
1074 | return -EFAULT; |
1075 | if (len < 0) |
1076 | return -EINVAL; |
1077 | |
1078 | lock_sock(sk); |
1079 | |
1080 | switch (optname) { |
1081 | case IP_OPTIONS: |
1082 | { |
1083 | unsigned char optbuf[sizeof(struct ip_options)+40]; |
1084 | struct ip_options * opt = (struct ip_options *)optbuf; |
1085 | opt->optlen = 0; |
1086 | if (inet->opt) |
1087 | memcpy(optbuf, inet->opt, |
1088 | sizeof(struct ip_options)+ |
1089 | inet->opt->optlen); |
1090 | release_sock(sk); |
1091 | |
1092 | if (opt->optlen == 0) |
1093 | return put_user(0, optlen); |
1094 | |
1095 | ip_options_undo(opt); |
1096 | |
1097 | len = min_t(unsigned int, len, opt->optlen); |
1098 | if (put_user(len, optlen)) |
1099 | return -EFAULT; |
1100 | if (copy_to_user(optval, opt->__data, len)) |
1101 | return -EFAULT; |
1102 | return 0; |
1103 | } |
1104 | case IP_PKTINFO: |
1105 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; |
1106 | break; |
1107 | case IP_RECVTTL: |
1108 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; |
1109 | break; |
1110 | case IP_RECVTOS: |
1111 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; |
1112 | break; |
1113 | case IP_RECVOPTS: |
1114 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; |
1115 | break; |
1116 | case IP_RETOPTS: |
1117 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; |
1118 | break; |
1119 | case IP_PASSSEC: |
1120 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; |
1121 | break; |
1122 | case IP_RECVORIGDSTADDR: |
1123 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; |
1124 | break; |
1125 | case IP_TOS: |
1126 | val = inet->tos; |
1127 | break; |
1128 | case IP_TTL: |
1129 | val = (inet->uc_ttl == -1 ? |
1130 | sysctl_ip_default_ttl : |
1131 | inet->uc_ttl); |
1132 | break; |
1133 | case IP_HDRINCL: |
1134 | val = inet->hdrincl; |
1135 | break; |
1136 | case IP_NODEFRAG: |
1137 | val = inet->nodefrag; |
1138 | break; |
1139 | case IP_MTU_DISCOVER: |
1140 | val = inet->pmtudisc; |
1141 | break; |
1142 | case IP_MTU: |
1143 | { |
1144 | struct dst_entry *dst; |
1145 | val = 0; |
1146 | dst = sk_dst_get(sk); |
1147 | if (dst) { |
1148 | val = dst_mtu(dst); |
1149 | dst_release(dst); |
1150 | } |
1151 | if (!val) { |
1152 | release_sock(sk); |
1153 | return -ENOTCONN; |
1154 | } |
1155 | break; |
1156 | } |
1157 | case IP_RECVERR: |
1158 | val = inet->recverr; |
1159 | break; |
1160 | case IP_MULTICAST_TTL: |
1161 | val = inet->mc_ttl; |
1162 | break; |
1163 | case IP_MULTICAST_LOOP: |
1164 | val = inet->mc_loop; |
1165 | break; |
1166 | case IP_MULTICAST_IF: |
1167 | { |
1168 | struct in_addr addr; |
1169 | len = min_t(unsigned int, len, sizeof(struct in_addr)); |
1170 | addr.s_addr = inet->mc_addr; |
1171 | release_sock(sk); |
1172 | |
1173 | if (put_user(len, optlen)) |
1174 | return -EFAULT; |
1175 | if (copy_to_user(optval, &addr, len)) |
1176 | return -EFAULT; |
1177 | return 0; |
1178 | } |
1179 | case IP_MSFILTER: |
1180 | { |
1181 | struct ip_msfilter msf; |
1182 | int err; |
1183 | |
1184 | if (len < IP_MSFILTER_SIZE(0)) { |
1185 | release_sock(sk); |
1186 | return -EINVAL; |
1187 | } |
1188 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1189 | release_sock(sk); |
1190 | return -EFAULT; |
1191 | } |
1192 | err = ip_mc_msfget(sk, &msf, |
1193 | (struct ip_msfilter __user *)optval, optlen); |
1194 | release_sock(sk); |
1195 | return err; |
1196 | } |
1197 | case MCAST_MSFILTER: |
1198 | { |
1199 | struct group_filter gsf; |
1200 | int err; |
1201 | |
1202 | if (len < GROUP_FILTER_SIZE(0)) { |
1203 | release_sock(sk); |
1204 | return -EINVAL; |
1205 | } |
1206 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { |
1207 | release_sock(sk); |
1208 | return -EFAULT; |
1209 | } |
1210 | err = ip_mc_gsfget(sk, &gsf, |
1211 | (struct group_filter __user *)optval, |
1212 | optlen); |
1213 | release_sock(sk); |
1214 | return err; |
1215 | } |
1216 | case IP_MULTICAST_ALL: |
1217 | val = inet->mc_all; |
1218 | break; |
1219 | case IP_PKTOPTIONS: |
1220 | { |
1221 | struct msghdr msg; |
1222 | |
1223 | release_sock(sk); |
1224 | |
1225 | if (sk->sk_type != SOCK_STREAM) |
1226 | return -ENOPROTOOPT; |
1227 | |
1228 | msg.msg_control = optval; |
1229 | msg.msg_controllen = len; |
1230 | msg.msg_flags = 0; |
1231 | |
1232 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1233 | struct in_pktinfo info; |
1234 | |
1235 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1236 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; |
1237 | info.ipi_ifindex = inet->mc_index; |
1238 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); |
1239 | } |
1240 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1241 | int hlim = inet->mc_ttl; |
1242 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); |
1243 | } |
1244 | len -= msg.msg_controllen; |
1245 | return put_user(len, optlen); |
1246 | } |
1247 | case IP_FREEBIND: |
1248 | val = inet->freebind; |
1249 | break; |
1250 | case IP_TRANSPARENT: |
1251 | val = inet->transparent; |
1252 | break; |
1253 | case IP_MINTTL: |
1254 | val = inet->min_ttl; |
1255 | break; |
1256 | default: |
1257 | release_sock(sk); |
1258 | return -ENOPROTOOPT; |
1259 | } |
1260 | release_sock(sk); |
1261 | |
1262 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1263 | unsigned char ucval = (unsigned char)val; |
1264 | len = 1; |
1265 | if (put_user(len, optlen)) |
1266 | return -EFAULT; |
1267 | if (copy_to_user(optval, &ucval, 1)) |
1268 | return -EFAULT; |
1269 | } else { |
1270 | len = min_t(unsigned int, sizeof(int), len); |
1271 | if (put_user(len, optlen)) |
1272 | return -EFAULT; |
1273 | if (copy_to_user(optval, &val, len)) |
1274 | return -EFAULT; |
1275 | } |
1276 | return 0; |
1277 | } |
1278 | |
1279 | int ip_getsockopt(struct sock *sk, int level, |
1280 | int optname, char __user *optval, int __user *optlen) |
1281 | { |
1282 | int err; |
1283 | |
1284 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); |
1285 | #ifdef CONFIG_NETFILTER |
1286 | /* we need to exclude all possible ENOPROTOOPTs except default case */ |
1287 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1288 | !ip_mroute_opt(optname)) { |
1289 | int len; |
1290 | |
1291 | if (get_user(len, optlen)) |
1292 | return -EFAULT; |
1293 | |
1294 | lock_sock(sk); |
1295 | err = nf_getsockopt(sk, PF_INET, optname, optval, |
1296 | &len); |
1297 | release_sock(sk); |
1298 | if (err >= 0) |
1299 | err = put_user(len, optlen); |
1300 | return err; |
1301 | } |
1302 | #endif |
1303 | return err; |
1304 | } |
1305 | EXPORT_SYMBOL(ip_getsockopt); |
1306 | |
1307 | #ifdef CONFIG_COMPAT |
1308 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1309 | char __user *optval, int __user *optlen) |
1310 | { |
1311 | int err; |
1312 | |
1313 | if (optname == MCAST_MSFILTER) |
1314 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, |
1315 | ip_getsockopt); |
1316 | |
1317 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); |
1318 | |
1319 | #ifdef CONFIG_NETFILTER |
1320 | /* we need to exclude all possible ENOPROTOOPTs except default case */ |
1321 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1322 | !ip_mroute_opt(optname)) { |
1323 | int len; |
1324 | |
1325 | if (get_user(len, optlen)) |
1326 | return -EFAULT; |
1327 | |
1328 | lock_sock(sk); |
1329 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
1330 | release_sock(sk); |
1331 | if (err >= 0) |
1332 | err = put_user(len, optlen); |
1333 | return err; |
1334 | } |
1335 | #endif |
1336 | return err; |
1337 | } |
1338 | EXPORT_SYMBOL(compat_ip_getsockopt); |
1339 | #endif |
1340 |
Branches:
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javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9