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. | |
e905a9ed | 7 | * |
1da177e4 LT |
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. | |
e905a9ed | 13 | * Alan Cox : Fixed a couple of oopses in Martin's |
1da177e4 LT |
14 | * TOS tweaks. |
15 | * Mike McLagan : Routing by source | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/mm.h> | |
1da177e4 LT |
21 | #include <linux/skbuff.h> |
22 | #include <linux/ip.h> | |
23 | #include <linux/icmp.h> | |
14c85021 | 24 | #include <linux/inetdevice.h> |
1da177e4 | 25 | #include <linux/netdevice.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 LT |
27 | #include <net/sock.h> |
28 | #include <net/ip.h> | |
29 | #include <net/icmp.h> | |
d83d8461 | 30 | #include <net/tcp_states.h> |
1da177e4 LT |
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> | |
2c67e9ac | 36 | #include <net/inet_ecn.h> |
1da177e4 LT |
37 | #include <net/route.h> |
38 | #include <net/xfrm.h> | |
dae50295 | 39 | #include <net/compat.h> |
1da177e4 LT |
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 |
e8b2dfe9 | 53 | #define IP_CMSG_ORIGDSTADDR 64 |
1da177e4 LT |
54 | |
55 | /* | |
56 | * SOL_IP control messages. | |
57 | */ | |
58 | ||
59 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
60 | { | |
61 | struct in_pktinfo info; | |
511c3f92 | 62 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 63 | |
eddc9ec5 | 64 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
65 | if (rt) { |
66 | info.ipi_ifindex = rt->rt_iif; | |
67 | info.ipi_spec_dst.s_addr = rt->rt_spec_dst; | |
68 | } else { | |
69 | info.ipi_ifindex = 0; | |
70 | info.ipi_spec_dst.s_addr = 0; | |
71 | } | |
72 | ||
73 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
74 | } | |
75 | ||
76 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
77 | { | |
eddc9ec5 | 78 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
79 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
80 | } | |
81 | ||
82 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
83 | { | |
eddc9ec5 | 84 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
85 | } |
86 | ||
87 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
88 | { | |
89 | if (IPCB(skb)->opt.optlen == 0) | |
90 | return; | |
91 | ||
eddc9ec5 ACM |
92 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
93 | ip_hdr(skb) + 1); | |
1da177e4 LT |
94 | } |
95 | ||
96 | ||
97 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
98 | { | |
99 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
09cb105e | 100 | struct ip_options * opt = (struct ip_options *)optbuf; |
1da177e4 LT |
101 | |
102 | if (IPCB(skb)->opt.optlen == 0) | |
103 | return; | |
104 | ||
105 | if (ip_options_echo(opt, skb)) { | |
106 | msg->msg_flags |= MSG_CTRUNC; | |
107 | return; | |
108 | } | |
109 | ip_options_undo(opt); | |
110 | ||
111 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
112 | } | |
113 | ||
2c7946a7 CZ |
114 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
115 | { | |
116 | char *secdata; | |
dc49c1f9 | 117 | u32 seclen, secid; |
2c7946a7 CZ |
118 | int err; |
119 | ||
dc49c1f9 CZ |
120 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
121 | if (err) | |
122 | return; | |
123 | ||
124 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
125 | if (err) |
126 | return; | |
127 | ||
128 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 129 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
130 | } |
131 | ||
21d1a161 | 132 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
133 | { |
134 | struct sockaddr_in sin; | |
b71d1d42 | 135 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 136 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
137 | |
138 | if (skb_transport_offset(skb) + 4 > skb->len) | |
139 | return; | |
140 | ||
141 | /* All current transport protocols have the port numbers in the | |
142 | * first four bytes of the transport header and this function is | |
143 | * written with this assumption in mind. | |
144 | */ | |
145 | ||
146 | sin.sin_family = AF_INET; | |
147 | sin.sin_addr.s_addr = iph->daddr; | |
148 | sin.sin_port = ports[1]; | |
149 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
150 | ||
151 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
152 | } | |
1da177e4 LT |
153 | |
154 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) | |
155 | { | |
156 | struct inet_sock *inet = inet_sk(skb->sk); | |
157 | unsigned flags = inet->cmsg_flags; | |
158 | ||
159 | /* Ordered by supposed usage frequency */ | |
160 | if (flags & 1) | |
161 | ip_cmsg_recv_pktinfo(msg, skb); | |
4d52cfbe | 162 | if ((flags >>= 1) == 0) |
1da177e4 LT |
163 | return; |
164 | ||
165 | if (flags & 1) | |
166 | ip_cmsg_recv_ttl(msg, skb); | |
4d52cfbe | 167 | if ((flags >>= 1) == 0) |
1da177e4 LT |
168 | return; |
169 | ||
170 | if (flags & 1) | |
171 | ip_cmsg_recv_tos(msg, skb); | |
4d52cfbe | 172 | if ((flags >>= 1) == 0) |
1da177e4 LT |
173 | return; |
174 | ||
175 | if (flags & 1) | |
176 | ip_cmsg_recv_opts(msg, skb); | |
4d52cfbe | 177 | if ((flags >>= 1) == 0) |
1da177e4 LT |
178 | return; |
179 | ||
180 | if (flags & 1) | |
181 | ip_cmsg_recv_retopts(msg, skb); | |
4d52cfbe | 182 | if ((flags >>= 1) == 0) |
2c7946a7 CZ |
183 | return; |
184 | ||
185 | if (flags & 1) | |
186 | ip_cmsg_recv_security(msg, skb); | |
e8b2dfe9 | 187 | |
4d52cfbe | 188 | if ((flags >>= 1) == 0) |
e8b2dfe9 BS |
189 | return; |
190 | if (flags & 1) | |
191 | ip_cmsg_recv_dstaddr(msg, skb); | |
192 | ||
1da177e4 | 193 | } |
4d52cfbe | 194 | EXPORT_SYMBOL(ip_cmsg_recv); |
1da177e4 | 195 | |
7a6adb92 | 196 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
1da177e4 LT |
197 | { |
198 | int err; | |
199 | struct cmsghdr *cmsg; | |
200 | ||
201 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
202 | if (!CMSG_OK(msg, cmsg)) | |
203 | return -EINVAL; | |
204 | if (cmsg->cmsg_level != SOL_IP) | |
205 | continue; | |
206 | switch (cmsg->cmsg_type) { | |
207 | case IP_RETOPTS: | |
208 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4d52cfbe ED |
209 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
210 | err < 40 ? err : 40); | |
1da177e4 LT |
211 | if (err) |
212 | return err; | |
213 | break; | |
214 | case IP_PKTINFO: | |
215 | { | |
216 | struct in_pktinfo *info; | |
217 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
218 | return -EINVAL; | |
219 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
220 | ipc->oif = info->ipi_ifindex; | |
221 | ipc->addr = info->ipi_spec_dst.s_addr; | |
222 | break; | |
223 | } | |
224 | default: | |
225 | return -EINVAL; | |
226 | } | |
227 | } | |
228 | return 0; | |
229 | } | |
230 | ||
231 | ||
232 | /* Special input handler for packets caught by router alert option. | |
233 | They are selected only by protocol field, and then processed likely | |
234 | local ones; but only if someone wants them! Otherwise, router | |
235 | not running rsvpd will kill RSVP. | |
236 | ||
237 | It is user level problem, what it will make with them. | |
238 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
239 | but receiver should be enough clever f.e. to forward mtrace requests, | |
240 | sent to multicast group to reach destination designated router. | |
241 | */ | |
43a951e9 | 242 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
243 | static DEFINE_SPINLOCK(ip_ra_lock); |
244 | ||
592fcb9d ED |
245 | |
246 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 247 | { |
592fcb9d ED |
248 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
249 | ||
250 | sock_put(ra->saved_sk); | |
251 | kfree(ra); | |
66018506 | 252 | } |
1da177e4 | 253 | |
4d52cfbe ED |
254 | int ip_ra_control(struct sock *sk, unsigned char on, |
255 | void (*destructor)(struct sock *)) | |
1da177e4 | 256 | { |
43a951e9 ED |
257 | struct ip_ra_chain *ra, *new_ra; |
258 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 259 | |
c720c7e8 | 260 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
261 | return -EINVAL; |
262 | ||
263 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
264 | ||
66018506 | 265 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
266 | for (rap = &ip_ra_chain; |
267 | (ra = rcu_dereference_protected(*rap, | |
268 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
269 | rap = &ra->next) { | |
1da177e4 LT |
270 | if (ra->sk == sk) { |
271 | if (on) { | |
66018506 | 272 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 273 | kfree(new_ra); |
1da177e4 LT |
274 | return -EADDRINUSE; |
275 | } | |
592fcb9d ED |
276 | /* dont let ip_call_ra_chain() use sk again */ |
277 | ra->sk = NULL; | |
66018506 ED |
278 | rcu_assign_pointer(*rap, ra->next); |
279 | spin_unlock_bh(&ip_ra_lock); | |
1da177e4 LT |
280 | |
281 | if (ra->destructor) | |
282 | ra->destructor(sk); | |
592fcb9d ED |
283 | /* |
284 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
285 | * period. This guarantee ip_call_ra_chain() dont need | |
286 | * to mess with socket refcounts. | |
287 | */ | |
288 | ra->saved_sk = sk; | |
289 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
290 | return 0; |
291 | } | |
292 | } | |
293 | if (new_ra == NULL) { | |
66018506 | 294 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
295 | return -ENOBUFS; |
296 | } | |
297 | new_ra->sk = sk; | |
298 | new_ra->destructor = destructor; | |
299 | ||
300 | new_ra->next = ra; | |
66018506 | 301 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 302 | sock_hold(sk); |
66018506 | 303 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
304 | |
305 | return 0; | |
306 | } | |
307 | ||
e905a9ed | 308 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 309 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 310 | { |
1da177e4 LT |
311 | struct sock_exterr_skb *serr; |
312 | ||
1da177e4 LT |
313 | skb = skb_clone(skb, GFP_ATOMIC); |
314 | if (!skb) | |
315 | return; | |
316 | ||
e905a9ed | 317 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
318 | serr->ee.ee_errno = err; |
319 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
320 | serr->ee.ee_type = icmp_hdr(skb)->type; |
321 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
322 | serr->ee.ee_pad = 0; |
323 | serr->ee.ee_info = info; | |
324 | serr->ee.ee_data = 0; | |
88c7664f | 325 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 326 | skb_network_header(skb); |
1da177e4 LT |
327 | serr->port = port; |
328 | ||
bd82393c ACM |
329 | if (skb_pull(skb, payload - skb->data) != NULL) { |
330 | skb_reset_transport_header(skb); | |
331 | if (sock_queue_err_skb(sk, skb) == 0) | |
332 | return; | |
333 | } | |
334 | kfree_skb(skb); | |
1da177e4 LT |
335 | } |
336 | ||
0579016e | 337 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
338 | { |
339 | struct inet_sock *inet = inet_sk(sk); | |
340 | struct sock_exterr_skb *serr; | |
341 | struct iphdr *iph; | |
342 | struct sk_buff *skb; | |
343 | ||
344 | if (!inet->recverr) | |
345 | return; | |
346 | ||
347 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
348 | if (!skb) | |
349 | return; | |
350 | ||
2ca9e6f2 ACM |
351 | skb_put(skb, sizeof(struct iphdr)); |
352 | skb_reset_network_header(skb); | |
eddc9ec5 | 353 | iph = ip_hdr(skb); |
1da177e4 LT |
354 | iph->daddr = daddr; |
355 | ||
e905a9ed | 356 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
357 | serr->ee.ee_errno = err; |
358 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 359 | serr->ee.ee_type = 0; |
1da177e4 LT |
360 | serr->ee.ee_code = 0; |
361 | serr->ee.ee_pad = 0; | |
362 | serr->ee.ee_info = info; | |
363 | serr->ee.ee_data = 0; | |
d56f90a7 | 364 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
365 | serr->port = port; |
366 | ||
27a884dc | 367 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 368 | skb_reset_transport_header(skb); |
1da177e4 LT |
369 | |
370 | if (sock_queue_err_skb(sk, skb)) | |
371 | kfree_skb(skb); | |
372 | } | |
373 | ||
e905a9ed | 374 | /* |
1da177e4 LT |
375 | * Handle MSG_ERRQUEUE |
376 | */ | |
377 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
378 | { | |
379 | struct sock_exterr_skb *serr; | |
380 | struct sk_buff *skb, *skb2; | |
381 | struct sockaddr_in *sin; | |
382 | struct { | |
383 | struct sock_extended_err ee; | |
384 | struct sockaddr_in offender; | |
385 | } errhdr; | |
386 | int err; | |
387 | int copied; | |
388 | ||
389 | err = -EAGAIN; | |
390 | skb = skb_dequeue(&sk->sk_error_queue); | |
391 | if (skb == NULL) | |
392 | goto out; | |
393 | ||
394 | copied = skb->len; | |
395 | if (copied > len) { | |
396 | msg->msg_flags |= MSG_TRUNC; | |
397 | copied = len; | |
398 | } | |
399 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
400 | if (err) | |
401 | goto out_free_skb; | |
402 | ||
403 | sock_recv_timestamp(msg, sk, skb); | |
404 | ||
405 | serr = SKB_EXT_ERR(skb); | |
406 | ||
407 | sin = (struct sockaddr_in *)msg->msg_name; | |
408 | if (sin) { | |
409 | sin->sin_family = AF_INET; | |
d56f90a7 ACM |
410 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
411 | serr->addr_offset); | |
1da177e4 LT |
412 | sin->sin_port = serr->port; |
413 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
414 | } | |
415 | ||
416 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
417 | sin = &errhdr.offender; | |
418 | sin->sin_family = AF_UNSPEC; | |
419 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { | |
420 | struct inet_sock *inet = inet_sk(sk); | |
421 | ||
422 | sin->sin_family = AF_INET; | |
eddc9ec5 | 423 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
424 | sin->sin_port = 0; |
425 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
426 | if (inet->cmsg_flags) | |
427 | ip_cmsg_recv(msg, skb); | |
428 | } | |
429 | ||
430 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
431 | ||
432 | /* Now we could try to dump offended packet options */ | |
433 | ||
434 | msg->msg_flags |= MSG_ERRQUEUE; | |
435 | err = copied; | |
436 | ||
437 | /* Reset and regenerate socket error */ | |
e0f9f858 | 438 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 439 | sk->sk_err = 0; |
4d52cfbe ED |
440 | skb2 = skb_peek(&sk->sk_error_queue); |
441 | if (skb2 != NULL) { | |
1da177e4 | 442 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
e0f9f858 | 443 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
444 | sk->sk_error_report(sk); |
445 | } else | |
e0f9f858 | 446 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 447 | |
e905a9ed | 448 | out_free_skb: |
1da177e4 LT |
449 | kfree_skb(skb); |
450 | out: | |
451 | return err; | |
452 | } | |
453 | ||
454 | ||
f6d8bd05 ED |
455 | static void opt_kfree_rcu(struct rcu_head *head) |
456 | { | |
457 | kfree(container_of(head, struct ip_options_rcu, rcu)); | |
458 | } | |
459 | ||
1da177e4 | 460 | /* |
4d52cfbe ED |
461 | * Socket option code for IP. This is the end of the line after any |
462 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
463 | */ |
464 | ||
3fdadf7d | 465 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 466 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
467 | { |
468 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 469 | int val = 0, err; |
1da177e4 | 470 | |
e905a9ed | 471 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
132adf54 SH |
472 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
473 | (1<<IP_RETOPTS) | (1<<IP_TOS) | | |
474 | (1<<IP_TTL) | (1<<IP_HDRINCL) | | |
475 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | | |
476 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | | |
d218d111 | 477 | (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) | |
7b2ff18e | 478 | (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) || |
132adf54 | 479 | optname == IP_MULTICAST_TTL || |
f771bef9 | 480 | optname == IP_MULTICAST_ALL || |
e8b2dfe9 BS |
481 | optname == IP_MULTICAST_LOOP || |
482 | optname == IP_RECVORIGDSTADDR) { | |
1da177e4 LT |
483 | if (optlen >= sizeof(int)) { |
484 | if (get_user(val, (int __user *) optval)) | |
485 | return -EFAULT; | |
486 | } else if (optlen >= sizeof(char)) { | |
487 | unsigned char ucval; | |
488 | ||
489 | if (get_user(ucval, (unsigned char __user *) optval)) | |
490 | return -EFAULT; | |
491 | val = (int) ucval; | |
492 | } | |
493 | } | |
494 | ||
495 | /* If optlen==0, it is equivalent to val == 0 */ | |
496 | ||
6a9fb947 | 497 | if (ip_mroute_opt(optname)) |
09cb105e | 498 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
499 | |
500 | err = 0; | |
501 | lock_sock(sk); | |
502 | ||
503 | switch (optname) { | |
132adf54 SH |
504 | case IP_OPTIONS: |
505 | { | |
f6d8bd05 ED |
506 | struct ip_options_rcu *old, *opt = NULL; |
507 | ||
65a1c4ff | 508 | if (optlen > 40) |
132adf54 | 509 | goto e_inval; |
3b1e0a65 | 510 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 511 | optval, optlen); |
132adf54 SH |
512 | if (err) |
513 | break; | |
f6d8bd05 ED |
514 | old = rcu_dereference_protected(inet->inet_opt, |
515 | sock_owned_by_user(sk)); | |
132adf54 SH |
516 | if (inet->is_icsk) { |
517 | struct inet_connection_sock *icsk = inet_csk(sk); | |
1da177e4 | 518 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
132adf54 SH |
519 | if (sk->sk_family == PF_INET || |
520 | (!((1 << sk->sk_state) & | |
521 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 522 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 523 | #endif |
f6d8bd05 ED |
524 | if (old) |
525 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 526 | if (opt) |
f6d8bd05 | 527 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 528 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
1da177e4 | 529 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 530 | } |
132adf54 | 531 | #endif |
1da177e4 | 532 | } |
f6d8bd05 ED |
533 | rcu_assign_pointer(inet->inet_opt, opt); |
534 | if (old) | |
535 | call_rcu(&old->rcu, opt_kfree_rcu); | |
132adf54 SH |
536 | break; |
537 | } | |
538 | case IP_PKTINFO: | |
539 | if (val) | |
540 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
541 | else | |
542 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
543 | break; | |
544 | case IP_RECVTTL: | |
545 | if (val) | |
546 | inet->cmsg_flags |= IP_CMSG_TTL; | |
547 | else | |
548 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
549 | break; | |
550 | case IP_RECVTOS: | |
551 | if (val) | |
552 | inet->cmsg_flags |= IP_CMSG_TOS; | |
553 | else | |
554 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
555 | break; | |
556 | case IP_RECVOPTS: | |
557 | if (val) | |
558 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
559 | else | |
560 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
561 | break; | |
562 | case IP_RETOPTS: | |
563 | if (val) | |
564 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
565 | else | |
566 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
567 | break; | |
568 | case IP_PASSSEC: | |
569 | if (val) | |
570 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
571 | else | |
572 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
573 | break; | |
e8b2dfe9 BS |
574 | case IP_RECVORIGDSTADDR: |
575 | if (val) | |
576 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
577 | else | |
578 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
579 | break; | |
132adf54 SH |
580 | case IP_TOS: /* This sets both TOS and Precedence */ |
581 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
582 | val &= ~INET_ECN_MASK; |
583 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 584 | } |
132adf54 SH |
585 | if (inet->tos != val) { |
586 | inet->tos = val; | |
587 | sk->sk_priority = rt_tos2priority(val); | |
588 | sk_dst_reset(sk); | |
589 | } | |
590 | break; | |
591 | case IP_TTL: | |
4d52cfbe | 592 | if (optlen < 1) |
132adf54 | 593 | goto e_inval; |
4d52cfbe | 594 | if (val != -1 && (val < 0 || val > 255)) |
132adf54 SH |
595 | goto e_inval; |
596 | inet->uc_ttl = val; | |
597 | break; | |
598 | case IP_HDRINCL: | |
599 | if (sk->sk_type != SOCK_RAW) { | |
600 | err = -ENOPROTOOPT; | |
2c7946a7 | 601 | break; |
132adf54 SH |
602 | } |
603 | inet->hdrincl = val ? 1 : 0; | |
604 | break; | |
7b2ff18e JO |
605 | case IP_NODEFRAG: |
606 | if (sk->sk_type != SOCK_RAW) { | |
607 | err = -ENOPROTOOPT; | |
608 | break; | |
609 | } | |
610 | inet->nodefrag = val ? 1 : 0; | |
611 | break; | |
132adf54 | 612 | case IP_MTU_DISCOVER: |
0eae750e | 613 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
132adf54 SH |
614 | goto e_inval; |
615 | inet->pmtudisc = val; | |
616 | break; | |
617 | case IP_RECVERR: | |
618 | inet->recverr = !!val; | |
619 | if (!val) | |
620 | skb_queue_purge(&sk->sk_error_queue); | |
621 | break; | |
622 | case IP_MULTICAST_TTL: | |
623 | if (sk->sk_type == SOCK_STREAM) | |
624 | goto e_inval; | |
4d52cfbe | 625 | if (optlen < 1) |
132adf54 | 626 | goto e_inval; |
09cb105e | 627 | if (val == -1) |
132adf54 SH |
628 | val = 1; |
629 | if (val < 0 || val > 255) | |
630 | goto e_inval; | |
631 | inet->mc_ttl = val; | |
632 | break; | |
633 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 634 | if (optlen < 1) |
132adf54 SH |
635 | goto e_inval; |
636 | inet->mc_loop = !!val; | |
637 | break; | |
638 | case IP_MULTICAST_IF: | |
639 | { | |
640 | struct ip_mreqn mreq; | |
641 | struct net_device *dev = NULL; | |
642 | ||
643 | if (sk->sk_type == SOCK_STREAM) | |
644 | goto e_inval; | |
645 | /* | |
646 | * Check the arguments are allowable | |
647 | */ | |
648 | ||
0915921b SW |
649 | if (optlen < sizeof(struct in_addr)) |
650 | goto e_inval; | |
651 | ||
132adf54 SH |
652 | err = -EFAULT; |
653 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 654 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 655 | break; |
132adf54 SH |
656 | } else { |
657 | memset(&mreq, 0, sizeof(mreq)); | |
658 | if (optlen >= sizeof(struct in_addr) && | |
4d52cfbe ED |
659 | copy_from_user(&mreq.imr_address, optval, |
660 | sizeof(struct in_addr))) | |
132adf54 SH |
661 | break; |
662 | } | |
663 | ||
664 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 665 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
666 | inet->mc_index = 0; |
667 | inet->mc_addr = 0; | |
668 | err = 0; | |
1da177e4 LT |
669 | break; |
670 | } | |
3b1e0a65 | 671 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 672 | if (dev) |
132adf54 | 673 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 674 | } else |
55b80503 | 675 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 676 | |
1da177e4 | 677 | |
132adf54 SH |
678 | err = -EADDRNOTAVAIL; |
679 | if (!dev) | |
680 | break; | |
55b80503 | 681 | dev_put(dev); |
132adf54 SH |
682 | |
683 | err = -EINVAL; | |
684 | if (sk->sk_bound_dev_if && | |
685 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
686 | break; | |
1da177e4 | 687 | |
132adf54 SH |
688 | inet->mc_index = mreq.imr_ifindex; |
689 | inet->mc_addr = mreq.imr_address.s_addr; | |
690 | err = 0; | |
691 | break; | |
692 | } | |
1da177e4 | 693 | |
132adf54 SH |
694 | case IP_ADD_MEMBERSHIP: |
695 | case IP_DROP_MEMBERSHIP: | |
696 | { | |
697 | struct ip_mreqn mreq; | |
1da177e4 | 698 | |
a96fb49b FL |
699 | err = -EPROTO; |
700 | if (inet_sk(sk)->is_icsk) | |
701 | break; | |
702 | ||
132adf54 SH |
703 | if (optlen < sizeof(struct ip_mreq)) |
704 | goto e_inval; | |
705 | err = -EFAULT; | |
706 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 707 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 708 | break; |
132adf54 SH |
709 | } else { |
710 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 711 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 712 | break; |
132adf54 | 713 | } |
1da177e4 | 714 | |
132adf54 SH |
715 | if (optname == IP_ADD_MEMBERSHIP) |
716 | err = ip_mc_join_group(sk, &mreq); | |
717 | else | |
718 | err = ip_mc_leave_group(sk, &mreq); | |
719 | break; | |
720 | } | |
721 | case IP_MSFILTER: | |
722 | { | |
132adf54 SH |
723 | struct ip_msfilter *msf; |
724 | ||
725 | if (optlen < IP_MSFILTER_SIZE(0)) | |
726 | goto e_inval; | |
727 | if (optlen > sysctl_optmem_max) { | |
728 | err = -ENOBUFS; | |
1da177e4 LT |
729 | break; |
730 | } | |
132adf54 | 731 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 732 | if (!msf) { |
132adf54 SH |
733 | err = -ENOBUFS; |
734 | break; | |
735 | } | |
736 | err = -EFAULT; | |
737 | if (copy_from_user(msf, optval, optlen)) { | |
738 | kfree(msf); | |
739 | break; | |
740 | } | |
741 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
742 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
743 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
744 | kfree(msf); | |
745 | err = -ENOBUFS; | |
746 | break; | |
747 | } | |
748 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
749 | kfree(msf); | |
750 | err = -EINVAL; | |
751 | break; | |
752 | } | |
753 | err = ip_mc_msfilter(sk, msf, 0); | |
754 | kfree(msf); | |
755 | break; | |
756 | } | |
757 | case IP_BLOCK_SOURCE: | |
758 | case IP_UNBLOCK_SOURCE: | |
759 | case IP_ADD_SOURCE_MEMBERSHIP: | |
760 | case IP_DROP_SOURCE_MEMBERSHIP: | |
761 | { | |
762 | struct ip_mreq_source mreqs; | |
763 | int omode, add; | |
1da177e4 | 764 | |
132adf54 SH |
765 | if (optlen != sizeof(struct ip_mreq_source)) |
766 | goto e_inval; | |
767 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 768 | err = -EFAULT; |
1da177e4 LT |
769 | break; |
770 | } | |
132adf54 SH |
771 | if (optname == IP_BLOCK_SOURCE) { |
772 | omode = MCAST_EXCLUDE; | |
773 | add = 1; | |
774 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
775 | omode = MCAST_EXCLUDE; | |
776 | add = 0; | |
777 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
778 | struct ip_mreqn mreq; | |
1da177e4 | 779 | |
132adf54 SH |
780 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
781 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
782 | mreq.imr_ifindex = 0; | |
783 | err = ip_mc_join_group(sk, &mreq); | |
784 | if (err && err != -EADDRINUSE) | |
1da177e4 | 785 | break; |
132adf54 SH |
786 | omode = MCAST_INCLUDE; |
787 | add = 1; | |
788 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
789 | omode = MCAST_INCLUDE; | |
790 | add = 0; | |
791 | } | |
792 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
793 | break; | |
794 | } | |
795 | case MCAST_JOIN_GROUP: | |
796 | case MCAST_LEAVE_GROUP: | |
797 | { | |
798 | struct group_req greq; | |
799 | struct sockaddr_in *psin; | |
800 | struct ip_mreqn mreq; | |
801 | ||
802 | if (optlen < sizeof(struct group_req)) | |
803 | goto e_inval; | |
804 | err = -EFAULT; | |
805 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
806 | break; | |
807 | psin = (struct sockaddr_in *)&greq.gr_group; | |
808 | if (psin->sin_family != AF_INET) | |
809 | goto e_inval; | |
810 | memset(&mreq, 0, sizeof(mreq)); | |
811 | mreq.imr_multiaddr = psin->sin_addr; | |
812 | mreq.imr_ifindex = greq.gr_interface; | |
813 | ||
814 | if (optname == MCAST_JOIN_GROUP) | |
815 | err = ip_mc_join_group(sk, &mreq); | |
816 | else | |
817 | err = ip_mc_leave_group(sk, &mreq); | |
818 | break; | |
819 | } | |
820 | case MCAST_JOIN_SOURCE_GROUP: | |
821 | case MCAST_LEAVE_SOURCE_GROUP: | |
822 | case MCAST_BLOCK_SOURCE: | |
823 | case MCAST_UNBLOCK_SOURCE: | |
824 | { | |
825 | struct group_source_req greqs; | |
826 | struct ip_mreq_source mreqs; | |
827 | struct sockaddr_in *psin; | |
828 | int omode, add; | |
829 | ||
830 | if (optlen != sizeof(struct group_source_req)) | |
831 | goto e_inval; | |
832 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 833 | err = -EFAULT; |
1da177e4 LT |
834 | break; |
835 | } | |
132adf54 SH |
836 | if (greqs.gsr_group.ss_family != AF_INET || |
837 | greqs.gsr_source.ss_family != AF_INET) { | |
838 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
839 | break; |
840 | } | |
132adf54 SH |
841 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
842 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
843 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
844 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
845 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
846 | ||
847 | if (optname == MCAST_BLOCK_SOURCE) { | |
848 | omode = MCAST_EXCLUDE; | |
849 | add = 1; | |
850 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
851 | omode = MCAST_EXCLUDE; | |
852 | add = 0; | |
853 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
854 | struct ip_mreqn mreq; |
855 | ||
132adf54 | 856 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 857 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
858 | mreq.imr_address.s_addr = 0; |
859 | mreq.imr_ifindex = greqs.gsr_interface; | |
860 | err = ip_mc_join_group(sk, &mreq); | |
861 | if (err && err != -EADDRINUSE) | |
862 | break; | |
863 | greqs.gsr_interface = mreq.imr_ifindex; | |
864 | omode = MCAST_INCLUDE; | |
865 | add = 1; | |
866 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
867 | omode = MCAST_INCLUDE; | |
868 | add = 0; | |
869 | } | |
870 | err = ip_mc_source(add, omode, sk, &mreqs, | |
871 | greqs.gsr_interface); | |
872 | break; | |
873 | } | |
874 | case MCAST_MSFILTER: | |
875 | { | |
132adf54 SH |
876 | struct sockaddr_in *psin; |
877 | struct ip_msfilter *msf = NULL; | |
878 | struct group_filter *gsf = NULL; | |
879 | int msize, i, ifindex; | |
880 | ||
881 | if (optlen < GROUP_FILTER_SIZE(0)) | |
882 | goto e_inval; | |
883 | if (optlen > sysctl_optmem_max) { | |
884 | err = -ENOBUFS; | |
1da177e4 LT |
885 | break; |
886 | } | |
09cb105e | 887 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 888 | if (!gsf) { |
132adf54 | 889 | err = -ENOBUFS; |
1da177e4 LT |
890 | break; |
891 | } | |
132adf54 | 892 | err = -EFAULT; |
4d52cfbe | 893 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 894 | goto mc_msf_out; |
4d52cfbe | 895 | |
132adf54 SH |
896 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
897 | if (gsf->gf_numsrc >= 0x1ffffff || | |
898 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
899 | err = -ENOBUFS; | |
900 | goto mc_msf_out; | |
901 | } | |
902 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
903 | err = -EINVAL; | |
904 | goto mc_msf_out; | |
905 | } | |
906 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 907 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 908 | if (!msf) { |
132adf54 SH |
909 | err = -ENOBUFS; |
910 | goto mc_msf_out; | |
911 | } | |
912 | ifindex = gsf->gf_interface; | |
913 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
914 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 915 | err = -EADDRNOTAVAIL; |
132adf54 | 916 | goto mc_msf_out; |
1da177e4 | 917 | } |
132adf54 SH |
918 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
919 | msf->imsf_interface = 0; | |
920 | msf->imsf_fmode = gsf->gf_fmode; | |
921 | msf->imsf_numsrc = gsf->gf_numsrc; | |
922 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 923 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 924 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 925 | |
132adf54 SH |
926 | if (psin->sin_family != AF_INET) |
927 | goto mc_msf_out; | |
928 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
929 | } | |
930 | kfree(gsf); | |
931 | gsf = NULL; | |
932 | ||
933 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 934 | mc_msf_out: |
132adf54 SH |
935 | kfree(msf); |
936 | kfree(gsf); | |
937 | break; | |
938 | } | |
f771bef9 NS |
939 | case IP_MULTICAST_ALL: |
940 | if (optlen < 1) | |
941 | goto e_inval; | |
942 | if (val != 0 && val != 1) | |
943 | goto e_inval; | |
944 | inet->mc_all = val; | |
945 | break; | |
132adf54 SH |
946 | case IP_ROUTER_ALERT: |
947 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
948 | break; | |
949 | ||
950 | case IP_FREEBIND: | |
4d52cfbe | 951 | if (optlen < 1) |
132adf54 SH |
952 | goto e_inval; |
953 | inet->freebind = !!val; | |
954 | break; | |
955 | ||
956 | case IP_IPSEC_POLICY: | |
957 | case IP_XFRM_POLICY: | |
958 | err = -EPERM; | |
959 | if (!capable(CAP_NET_ADMIN)) | |
1da177e4 | 960 | break; |
132adf54 SH |
961 | err = xfrm_user_policy(sk, optname, optval, optlen); |
962 | break; | |
1da177e4 | 963 | |
f5715aea | 964 | case IP_TRANSPARENT: |
6cc7a765 | 965 | if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) { |
f5715aea KK |
966 | err = -EPERM; |
967 | break; | |
968 | } | |
969 | if (optlen < 1) | |
970 | goto e_inval; | |
971 | inet->transparent = !!val; | |
972 | break; | |
973 | ||
d218d111 SH |
974 | case IP_MINTTL: |
975 | if (optlen < 1) | |
976 | goto e_inval; | |
977 | if (val < 0 || val > 255) | |
978 | goto e_inval; | |
979 | inet->min_ttl = val; | |
980 | break; | |
981 | ||
132adf54 SH |
982 | default: |
983 | err = -ENOPROTOOPT; | |
984 | break; | |
1da177e4 LT |
985 | } |
986 | release_sock(sk); | |
987 | return err; | |
988 | ||
989 | e_inval: | |
990 | release_sock(sk); | |
991 | return -EINVAL; | |
992 | } | |
993 | ||
f84af32c ED |
994 | /** |
995 | * ip_queue_rcv_skb - Queue an skb into sock receive queue | |
996 | * @sk: socket | |
997 | * @skb: buffer | |
998 | * | |
999 | * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option | |
1000 | * is not set, we drop skb dst entry now, while dst cache line is hot. | |
1001 | */ | |
1002 | int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1003 | { | |
1004 | if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO)) | |
1005 | skb_dst_drop(skb); | |
1006 | return sock_queue_rcv_skb(sk, skb); | |
1007 | } | |
1008 | EXPORT_SYMBOL(ip_queue_rcv_skb); | |
1009 | ||
3fdadf7d | 1010 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1011 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1012 | { |
1013 | int err; | |
1014 | ||
1015 | if (level != SOL_IP) | |
1016 | return -ENOPROTOOPT; | |
1017 | ||
1018 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1019 | #ifdef CONFIG_NETFILTER | |
1020 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1021 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1022 | optname != IP_IPSEC_POLICY && |
1023 | optname != IP_XFRM_POLICY && | |
1024 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1025 | lock_sock(sk); |
1026 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1027 | release_sock(sk); | |
1028 | } | |
1029 | #endif | |
1030 | return err; | |
1031 | } | |
4d52cfbe | 1032 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1033 | |
1034 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1035 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1036 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1037 | { |
1038 | int err; | |
1039 | ||
1040 | if (level != SOL_IP) | |
1041 | return -ENOPROTOOPT; | |
1042 | ||
dae50295 DS |
1043 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1044 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1045 | ip_setsockopt); | |
1046 | ||
3fdadf7d DM |
1047 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1048 | #ifdef CONFIG_NETFILTER | |
1049 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1050 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1051 | optname != IP_IPSEC_POLICY && |
1052 | optname != IP_XFRM_POLICY && | |
1053 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1054 | lock_sock(sk); |
543d9cfe ACM |
1055 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1056 | optval, optlen); | |
3fdadf7d DM |
1057 | release_sock(sk); |
1058 | } | |
1059 | #endif | |
1060 | return err; | |
1061 | } | |
543d9cfe | 1062 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1063 | #endif |
1064 | ||
1da177e4 | 1065 | /* |
4d52cfbe ED |
1066 | * Get the options. Note for future reference. The GET of IP options gets |
1067 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1068 | */ |
1069 | ||
3fdadf7d | 1070 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
dd23198e | 1071 | char __user *optval, int __user *optlen, unsigned flags) |
1da177e4 LT |
1072 | { |
1073 | struct inet_sock *inet = inet_sk(sk); | |
1074 | int val; | |
1075 | int len; | |
e905a9ed | 1076 | |
132adf54 | 1077 | if (level != SOL_IP) |
1da177e4 LT |
1078 | return -EOPNOTSUPP; |
1079 | ||
6a9fb947 | 1080 | if (ip_mroute_opt(optname)) |
09cb105e | 1081 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1082 | |
09cb105e | 1083 | if (get_user(len, optlen)) |
1da177e4 | 1084 | return -EFAULT; |
132adf54 | 1085 | if (len < 0) |
1da177e4 | 1086 | return -EINVAL; |
e905a9ed | 1087 | |
1da177e4 LT |
1088 | lock_sock(sk); |
1089 | ||
132adf54 SH |
1090 | switch (optname) { |
1091 | case IP_OPTIONS: | |
1092 | { | |
1093 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1094 | struct ip_options *opt = (struct ip_options *)optbuf; |
1095 | struct ip_options_rcu *inet_opt; | |
1096 | ||
1097 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1098 | sock_owned_by_user(sk)); | |
132adf54 | 1099 | opt->optlen = 0; |
f6d8bd05 ED |
1100 | if (inet_opt) |
1101 | memcpy(optbuf, &inet_opt->opt, | |
1102 | sizeof(struct ip_options) + | |
1103 | inet_opt->opt.optlen); | |
132adf54 SH |
1104 | release_sock(sk); |
1105 | ||
1106 | if (opt->optlen == 0) | |
1107 | return put_user(0, optlen); | |
1108 | ||
1109 | ip_options_undo(opt); | |
1110 | ||
1111 | len = min_t(unsigned int, len, opt->optlen); | |
1112 | if (put_user(len, optlen)) | |
1113 | return -EFAULT; | |
1114 | if (copy_to_user(optval, opt->__data, len)) | |
1115 | return -EFAULT; | |
1116 | return 0; | |
1117 | } | |
1118 | case IP_PKTINFO: | |
1119 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1120 | break; | |
1121 | case IP_RECVTTL: | |
1122 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1123 | break; | |
1124 | case IP_RECVTOS: | |
1125 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1126 | break; | |
1127 | case IP_RECVOPTS: | |
1128 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1129 | break; | |
1130 | case IP_RETOPTS: | |
1131 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1132 | break; | |
1133 | case IP_PASSSEC: | |
1134 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1135 | break; | |
e8b2dfe9 BS |
1136 | case IP_RECVORIGDSTADDR: |
1137 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1138 | break; | |
132adf54 SH |
1139 | case IP_TOS: |
1140 | val = inet->tos; | |
1141 | break; | |
1142 | case IP_TTL: | |
1143 | val = (inet->uc_ttl == -1 ? | |
1144 | sysctl_ip_default_ttl : | |
1145 | inet->uc_ttl); | |
1146 | break; | |
1147 | case IP_HDRINCL: | |
1148 | val = inet->hdrincl; | |
1149 | break; | |
a89b4763 MK |
1150 | case IP_NODEFRAG: |
1151 | val = inet->nodefrag; | |
1152 | break; | |
132adf54 SH |
1153 | case IP_MTU_DISCOVER: |
1154 | val = inet->pmtudisc; | |
1155 | break; | |
1156 | case IP_MTU: | |
1157 | { | |
1158 | struct dst_entry *dst; | |
1159 | val = 0; | |
1160 | dst = sk_dst_get(sk); | |
1161 | if (dst) { | |
1162 | val = dst_mtu(dst); | |
1163 | dst_release(dst); | |
1da177e4 | 1164 | } |
132adf54 | 1165 | if (!val) { |
1da177e4 | 1166 | release_sock(sk); |
132adf54 | 1167 | return -ENOTCONN; |
1da177e4 | 1168 | } |
132adf54 SH |
1169 | break; |
1170 | } | |
1171 | case IP_RECVERR: | |
1172 | val = inet->recverr; | |
1173 | break; | |
1174 | case IP_MULTICAST_TTL: | |
1175 | val = inet->mc_ttl; | |
1176 | break; | |
1177 | case IP_MULTICAST_LOOP: | |
1178 | val = inet->mc_loop; | |
1179 | break; | |
1180 | case IP_MULTICAST_IF: | |
1181 | { | |
1182 | struct in_addr addr; | |
1183 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1184 | addr.s_addr = inet->mc_addr; | |
1185 | release_sock(sk); | |
1da177e4 | 1186 | |
132adf54 SH |
1187 | if (put_user(len, optlen)) |
1188 | return -EFAULT; | |
1189 | if (copy_to_user(optval, &addr, len)) | |
1190 | return -EFAULT; | |
1191 | return 0; | |
1192 | } | |
1193 | case IP_MSFILTER: | |
1194 | { | |
1195 | struct ip_msfilter msf; | |
1196 | int err; | |
1197 | ||
1198 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1199 | release_sock(sk); |
132adf54 | 1200 | return -EINVAL; |
1da177e4 | 1201 | } |
132adf54 | 1202 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1203 | release_sock(sk); |
132adf54 | 1204 | return -EFAULT; |
1da177e4 | 1205 | } |
132adf54 SH |
1206 | err = ip_mc_msfget(sk, &msf, |
1207 | (struct ip_msfilter __user *)optval, optlen); | |
1208 | release_sock(sk); | |
1209 | return err; | |
1210 | } | |
1211 | case MCAST_MSFILTER: | |
1212 | { | |
1213 | struct group_filter gsf; | |
1214 | int err; | |
1da177e4 | 1215 | |
132adf54 | 1216 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1217 | release_sock(sk); |
132adf54 SH |
1218 | return -EINVAL; |
1219 | } | |
1220 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1221 | release_sock(sk); | |
1222 | return -EFAULT; | |
1223 | } | |
1224 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1225 | (struct group_filter __user *)optval, |
1226 | optlen); | |
132adf54 SH |
1227 | release_sock(sk); |
1228 | return err; | |
1229 | } | |
f771bef9 NS |
1230 | case IP_MULTICAST_ALL: |
1231 | val = inet->mc_all; | |
1232 | break; | |
132adf54 SH |
1233 | case IP_PKTOPTIONS: |
1234 | { | |
1235 | struct msghdr msg; | |
1da177e4 | 1236 | |
132adf54 | 1237 | release_sock(sk); |
1da177e4 | 1238 | |
132adf54 SH |
1239 | if (sk->sk_type != SOCK_STREAM) |
1240 | return -ENOPROTOOPT; | |
1da177e4 | 1241 | |
132adf54 SH |
1242 | msg.msg_control = optval; |
1243 | msg.msg_controllen = len; | |
dd23198e | 1244 | msg.msg_flags = flags; |
1da177e4 | 1245 | |
132adf54 SH |
1246 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1247 | struct in_pktinfo info; | |
1248 | ||
c720c7e8 ED |
1249 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1250 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1251 | info.ipi_ifindex = inet->mc_index; |
1252 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1253 | } |
132adf54 SH |
1254 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1255 | int hlim = inet->mc_ttl; | |
1256 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1257 | } | |
1258 | len -= msg.msg_controllen; | |
1259 | return put_user(len, optlen); | |
1260 | } | |
1261 | case IP_FREEBIND: | |
1262 | val = inet->freebind; | |
1263 | break; | |
f5715aea KK |
1264 | case IP_TRANSPARENT: |
1265 | val = inet->transparent; | |
1266 | break; | |
d218d111 SH |
1267 | case IP_MINTTL: |
1268 | val = inet->min_ttl; | |
1269 | break; | |
132adf54 SH |
1270 | default: |
1271 | release_sock(sk); | |
1272 | return -ENOPROTOOPT; | |
1da177e4 LT |
1273 | } |
1274 | release_sock(sk); | |
e905a9ed | 1275 | |
4d52cfbe | 1276 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1277 | unsigned char ucval = (unsigned char)val; |
1278 | len = 1; | |
132adf54 | 1279 | if (put_user(len, optlen)) |
1da177e4 | 1280 | return -EFAULT; |
09cb105e | 1281 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1282 | return -EFAULT; |
1283 | } else { | |
1284 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1285 | if (put_user(len, optlen)) |
1da177e4 | 1286 | return -EFAULT; |
09cb105e | 1287 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1288 | return -EFAULT; |
1289 | } | |
1290 | return 0; | |
1291 | } | |
1292 | ||
3fdadf7d | 1293 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1294 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1295 | { |
1296 | int err; | |
1297 | ||
dd23198e | 1298 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1299 | #ifdef CONFIG_NETFILTER |
1300 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1301 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1302 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1303 | int len; |
3fdadf7d | 1304 | |
09cb105e | 1305 | if (get_user(len, optlen)) |
3fdadf7d DM |
1306 | return -EFAULT; |
1307 | ||
1308 | lock_sock(sk); | |
1309 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1310 | &len); | |
1311 | release_sock(sk); | |
1312 | if (err >= 0) | |
1313 | err = put_user(len, optlen); | |
1314 | return err; | |
1315 | } | |
1316 | #endif | |
1317 | return err; | |
1318 | } | |
4d52cfbe | 1319 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1320 | |
1321 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1322 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1323 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1324 | { |
42908c69 DS |
1325 | int err; |
1326 | ||
1327 | if (optname == MCAST_MSFILTER) | |
1328 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1329 | ip_getsockopt); | |
1330 | ||
dd23198e DB |
1331 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1332 | MSG_CMSG_COMPAT); | |
42908c69 | 1333 | |
3fdadf7d DM |
1334 | #ifdef CONFIG_NETFILTER |
1335 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1336 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1337 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1338 | int len; |
3fdadf7d | 1339 | |
543d9cfe | 1340 | if (get_user(len, optlen)) |
3fdadf7d DM |
1341 | return -EFAULT; |
1342 | ||
1343 | lock_sock(sk); | |
543d9cfe | 1344 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1345 | release_sock(sk); |
1346 | if (err >= 0) | |
1347 | err = put_user(len, optlen); | |
1348 | return err; | |
1349 | } | |
1350 | #endif | |
1351 | return err; | |
1352 | } | |
543d9cfe | 1353 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1354 | #endif |