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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> | |
36 | #include <net/route.h> | |
37 | #include <net/xfrm.h> | |
dae50295 | 38 | #include <net/compat.h> |
1da177e4 LT |
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 | |
2c7946a7 | 51 | #define IP_CMSG_PASSSEC 32 |
e8b2dfe9 | 52 | #define IP_CMSG_ORIGDSTADDR 64 |
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; | |
511c3f92 | 61 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 62 | |
eddc9ec5 | 63 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
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 | { | |
eddc9ec5 | 77 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
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 | { | |
eddc9ec5 | 83 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
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 | ||
eddc9ec5 ACM |
91 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
92 | ip_hdr(skb) + 1); | |
1da177e4 LT |
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]; | |
09cb105e | 99 | struct ip_options * opt = (struct ip_options *)optbuf; |
1da177e4 LT |
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 | ||
2c7946a7 CZ |
113 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
114 | { | |
115 | char *secdata; | |
dc49c1f9 | 116 | u32 seclen, secid; |
2c7946a7 CZ |
117 | int err; |
118 | ||
dc49c1f9 CZ |
119 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
120 | if (err) | |
121 | return; | |
122 | ||
123 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
124 | if (err) |
125 | return; | |
126 | ||
127 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 128 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
129 | } |
130 | ||
21d1a161 | 131 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
132 | { |
133 | struct sockaddr_in sin; | |
b71d1d42 | 134 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 135 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
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 | } | |
1da177e4 LT |
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); | |
4d52cfbe | 161 | if ((flags >>= 1) == 0) |
1da177e4 LT |
162 | return; |
163 | ||
164 | if (flags & 1) | |
165 | ip_cmsg_recv_ttl(msg, skb); | |
4d52cfbe | 166 | if ((flags >>= 1) == 0) |
1da177e4 LT |
167 | return; |
168 | ||
169 | if (flags & 1) | |
170 | ip_cmsg_recv_tos(msg, skb); | |
4d52cfbe | 171 | if ((flags >>= 1) == 0) |
1da177e4 LT |
172 | return; |
173 | ||
174 | if (flags & 1) | |
175 | ip_cmsg_recv_opts(msg, skb); | |
4d52cfbe | 176 | if ((flags >>= 1) == 0) |
1da177e4 LT |
177 | return; |
178 | ||
179 | if (flags & 1) | |
180 | ip_cmsg_recv_retopts(msg, skb); | |
4d52cfbe | 181 | if ((flags >>= 1) == 0) |
2c7946a7 CZ |
182 | return; |
183 | ||
184 | if (flags & 1) | |
185 | ip_cmsg_recv_security(msg, skb); | |
e8b2dfe9 | 186 | |
4d52cfbe | 187 | if ((flags >>= 1) == 0) |
e8b2dfe9 BS |
188 | return; |
189 | if (flags & 1) | |
190 | ip_cmsg_recv_dstaddr(msg, skb); | |
191 | ||
1da177e4 | 192 | } |
4d52cfbe | 193 | EXPORT_SYMBOL(ip_cmsg_recv); |
1da177e4 | 194 | |
7a6adb92 | 195 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
1da177e4 LT |
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)); | |
4d52cfbe ED |
208 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
209 | err < 40 ? err : 40); | |
1da177e4 LT |
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 | */ | |
43a951e9 | 241 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
242 | static DEFINE_SPINLOCK(ip_ra_lock); |
243 | ||
592fcb9d ED |
244 | |
245 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 246 | { |
592fcb9d ED |
247 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
248 | ||
249 | sock_put(ra->saved_sk); | |
250 | kfree(ra); | |
66018506 | 251 | } |
1da177e4 | 252 | |
4d52cfbe ED |
253 | int ip_ra_control(struct sock *sk, unsigned char on, |
254 | void (*destructor)(struct sock *)) | |
1da177e4 | 255 | { |
43a951e9 ED |
256 | struct ip_ra_chain *ra, *new_ra; |
257 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 258 | |
c720c7e8 | 259 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
260 | return -EINVAL; |
261 | ||
262 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
263 | ||
66018506 | 264 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
265 | for (rap = &ip_ra_chain; |
266 | (ra = rcu_dereference_protected(*rap, | |
267 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
268 | rap = &ra->next) { | |
1da177e4 LT |
269 | if (ra->sk == sk) { |
270 | if (on) { | |
66018506 | 271 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 272 | kfree(new_ra); |
1da177e4 LT |
273 | return -EADDRINUSE; |
274 | } | |
592fcb9d ED |
275 | /* dont let ip_call_ra_chain() use sk again */ |
276 | ra->sk = NULL; | |
66018506 ED |
277 | rcu_assign_pointer(*rap, ra->next); |
278 | spin_unlock_bh(&ip_ra_lock); | |
1da177e4 LT |
279 | |
280 | if (ra->destructor) | |
281 | ra->destructor(sk); | |
592fcb9d ED |
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); | |
1da177e4 LT |
289 | return 0; |
290 | } | |
291 | } | |
292 | if (new_ra == NULL) { | |
66018506 | 293 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
294 | return -ENOBUFS; |
295 | } | |
296 | new_ra->sk = sk; | |
297 | new_ra->destructor = destructor; | |
298 | ||
299 | new_ra->next = ra; | |
66018506 | 300 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 301 | sock_hold(sk); |
66018506 | 302 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
303 | |
304 | return 0; | |
305 | } | |
306 | ||
e905a9ed | 307 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 308 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 309 | { |
1da177e4 LT |
310 | struct sock_exterr_skb *serr; |
311 | ||
1da177e4 LT |
312 | skb = skb_clone(skb, GFP_ATOMIC); |
313 | if (!skb) | |
314 | return; | |
315 | ||
e905a9ed | 316 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
317 | serr->ee.ee_errno = err; |
318 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
319 | serr->ee.ee_type = icmp_hdr(skb)->type; |
320 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
321 | serr->ee.ee_pad = 0; |
322 | serr->ee.ee_info = info; | |
323 | serr->ee.ee_data = 0; | |
88c7664f | 324 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 325 | skb_network_header(skb); |
1da177e4 LT |
326 | serr->port = port; |
327 | ||
bd82393c ACM |
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); | |
1da177e4 LT |
334 | } |
335 | ||
0579016e | 336 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
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 | ||
2ca9e6f2 ACM |
350 | skb_put(skb, sizeof(struct iphdr)); |
351 | skb_reset_network_header(skb); | |
eddc9ec5 | 352 | iph = ip_hdr(skb); |
1da177e4 LT |
353 | iph->daddr = daddr; |
354 | ||
e905a9ed | 355 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
356 | serr->ee.ee_errno = err; |
357 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 358 | serr->ee.ee_type = 0; |
1da177e4 LT |
359 | serr->ee.ee_code = 0; |
360 | serr->ee.ee_pad = 0; | |
361 | serr->ee.ee_info = info; | |
362 | serr->ee.ee_data = 0; | |
d56f90a7 | 363 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
364 | serr->port = port; |
365 | ||
27a884dc | 366 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 367 | skb_reset_transport_header(skb); |
1da177e4 LT |
368 | |
369 | if (sock_queue_err_skb(sk, skb)) | |
370 | kfree_skb(skb); | |
371 | } | |
372 | ||
e905a9ed | 373 | /* |
1da177e4 LT |
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; | |
d56f90a7 ACM |
409 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
410 | serr->addr_offset); | |
1da177e4 LT |
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; | |
eddc9ec5 | 422 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
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 */ | |
e0f9f858 | 437 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 438 | sk->sk_err = 0; |
4d52cfbe ED |
439 | skb2 = skb_peek(&sk->sk_error_queue); |
440 | if (skb2 != NULL) { | |
1da177e4 | 441 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
e0f9f858 | 442 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
443 | sk->sk_error_report(sk); |
444 | } else | |
e0f9f858 | 445 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 446 | |
e905a9ed | 447 | out_free_skb: |
1da177e4 LT |
448 | kfree_skb(skb); |
449 | out: | |
450 | return err; | |
451 | } | |
452 | ||
453 | ||
f6d8bd05 ED |
454 | static void opt_kfree_rcu(struct rcu_head *head) |
455 | { | |
456 | kfree(container_of(head, struct ip_options_rcu, rcu)); | |
457 | } | |
458 | ||
1da177e4 | 459 | /* |
4d52cfbe ED |
460 | * Socket option code for IP. This is the end of the line after any |
461 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
462 | */ |
463 | ||
3fdadf7d | 464 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 465 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
466 | { |
467 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 468 | int val = 0, err; |
1da177e4 | 469 | |
e905a9ed | 470 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
132adf54 SH |
471 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
472 | (1<<IP_RETOPTS) | (1<<IP_TOS) | | |
473 | (1<<IP_TTL) | (1<<IP_HDRINCL) | | |
474 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | | |
475 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | | |
d218d111 | 476 | (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) | |
7b2ff18e | 477 | (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) || |
132adf54 | 478 | optname == IP_MULTICAST_TTL || |
f771bef9 | 479 | optname == IP_MULTICAST_ALL || |
e8b2dfe9 BS |
480 | optname == IP_MULTICAST_LOOP || |
481 | optname == IP_RECVORIGDSTADDR) { | |
1da177e4 LT |
482 | if (optlen >= sizeof(int)) { |
483 | if (get_user(val, (int __user *) optval)) | |
484 | return -EFAULT; | |
485 | } else if (optlen >= sizeof(char)) { | |
486 | unsigned char ucval; | |
487 | ||
488 | if (get_user(ucval, (unsigned char __user *) optval)) | |
489 | return -EFAULT; | |
490 | val = (int) ucval; | |
491 | } | |
492 | } | |
493 | ||
494 | /* If optlen==0, it is equivalent to val == 0 */ | |
495 | ||
6a9fb947 | 496 | if (ip_mroute_opt(optname)) |
09cb105e | 497 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
498 | |
499 | err = 0; | |
500 | lock_sock(sk); | |
501 | ||
502 | switch (optname) { | |
132adf54 SH |
503 | case IP_OPTIONS: |
504 | { | |
f6d8bd05 ED |
505 | struct ip_options_rcu *old, *opt = NULL; |
506 | ||
65a1c4ff | 507 | if (optlen > 40) |
132adf54 | 508 | goto e_inval; |
3b1e0a65 | 509 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 510 | optval, optlen); |
132adf54 SH |
511 | if (err) |
512 | break; | |
f6d8bd05 ED |
513 | old = rcu_dereference_protected(inet->inet_opt, |
514 | sock_owned_by_user(sk)); | |
132adf54 SH |
515 | if (inet->is_icsk) { |
516 | struct inet_connection_sock *icsk = inet_csk(sk); | |
1da177e4 | 517 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
132adf54 SH |
518 | if (sk->sk_family == PF_INET || |
519 | (!((1 << sk->sk_state) & | |
520 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 521 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 522 | #endif |
f6d8bd05 ED |
523 | if (old) |
524 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 525 | if (opt) |
f6d8bd05 | 526 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 527 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
1da177e4 | 528 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 529 | } |
132adf54 | 530 | #endif |
1da177e4 | 531 | } |
f6d8bd05 ED |
532 | rcu_assign_pointer(inet->inet_opt, opt); |
533 | if (old) | |
534 | call_rcu(&old->rcu, opt_kfree_rcu); | |
132adf54 SH |
535 | break; |
536 | } | |
537 | case IP_PKTINFO: | |
538 | if (val) | |
539 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
540 | else | |
541 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
542 | break; | |
543 | case IP_RECVTTL: | |
544 | if (val) | |
545 | inet->cmsg_flags |= IP_CMSG_TTL; | |
546 | else | |
547 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
548 | break; | |
549 | case IP_RECVTOS: | |
550 | if (val) | |
551 | inet->cmsg_flags |= IP_CMSG_TOS; | |
552 | else | |
553 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
554 | break; | |
555 | case IP_RECVOPTS: | |
556 | if (val) | |
557 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
558 | else | |
559 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
560 | break; | |
561 | case IP_RETOPTS: | |
562 | if (val) | |
563 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
564 | else | |
565 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
566 | break; | |
567 | case IP_PASSSEC: | |
568 | if (val) | |
569 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
570 | else | |
571 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
572 | break; | |
e8b2dfe9 BS |
573 | case IP_RECVORIGDSTADDR: |
574 | if (val) | |
575 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
576 | else | |
577 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
578 | break; | |
132adf54 SH |
579 | case IP_TOS: /* This sets both TOS and Precedence */ |
580 | if (sk->sk_type == SOCK_STREAM) { | |
581 | val &= ~3; | |
582 | val |= inet->tos & 3; | |
583 | } | |
132adf54 SH |
584 | if (inet->tos != val) { |
585 | inet->tos = val; | |
586 | sk->sk_priority = rt_tos2priority(val); | |
587 | sk_dst_reset(sk); | |
588 | } | |
589 | break; | |
590 | case IP_TTL: | |
4d52cfbe | 591 | if (optlen < 1) |
132adf54 | 592 | goto e_inval; |
4d52cfbe | 593 | if (val != -1 && (val < 0 || val > 255)) |
132adf54 SH |
594 | goto e_inval; |
595 | inet->uc_ttl = val; | |
596 | break; | |
597 | case IP_HDRINCL: | |
598 | if (sk->sk_type != SOCK_RAW) { | |
599 | err = -ENOPROTOOPT; | |
2c7946a7 | 600 | break; |
132adf54 SH |
601 | } |
602 | inet->hdrincl = val ? 1 : 0; | |
603 | break; | |
7b2ff18e JO |
604 | case IP_NODEFRAG: |
605 | if (sk->sk_type != SOCK_RAW) { | |
606 | err = -ENOPROTOOPT; | |
607 | break; | |
608 | } | |
609 | inet->nodefrag = val ? 1 : 0; | |
610 | break; | |
132adf54 | 611 | case IP_MTU_DISCOVER: |
0eae750e | 612 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
132adf54 SH |
613 | goto e_inval; |
614 | inet->pmtudisc = val; | |
615 | break; | |
616 | case IP_RECVERR: | |
617 | inet->recverr = !!val; | |
618 | if (!val) | |
619 | skb_queue_purge(&sk->sk_error_queue); | |
620 | break; | |
621 | case IP_MULTICAST_TTL: | |
622 | if (sk->sk_type == SOCK_STREAM) | |
623 | goto e_inval; | |
4d52cfbe | 624 | if (optlen < 1) |
132adf54 | 625 | goto e_inval; |
09cb105e | 626 | if (val == -1) |
132adf54 SH |
627 | val = 1; |
628 | if (val < 0 || val > 255) | |
629 | goto e_inval; | |
630 | inet->mc_ttl = val; | |
631 | break; | |
632 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 633 | if (optlen < 1) |
132adf54 SH |
634 | goto e_inval; |
635 | inet->mc_loop = !!val; | |
636 | break; | |
637 | case IP_MULTICAST_IF: | |
638 | { | |
639 | struct ip_mreqn mreq; | |
640 | struct net_device *dev = NULL; | |
641 | ||
642 | if (sk->sk_type == SOCK_STREAM) | |
643 | goto e_inval; | |
644 | /* | |
645 | * Check the arguments are allowable | |
646 | */ | |
647 | ||
0915921b SW |
648 | if (optlen < sizeof(struct in_addr)) |
649 | goto e_inval; | |
650 | ||
132adf54 SH |
651 | err = -EFAULT; |
652 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 653 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 654 | break; |
132adf54 SH |
655 | } else { |
656 | memset(&mreq, 0, sizeof(mreq)); | |
657 | if (optlen >= sizeof(struct in_addr) && | |
4d52cfbe ED |
658 | copy_from_user(&mreq.imr_address, optval, |
659 | sizeof(struct in_addr))) | |
132adf54 SH |
660 | break; |
661 | } | |
662 | ||
663 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 664 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
665 | inet->mc_index = 0; |
666 | inet->mc_addr = 0; | |
667 | err = 0; | |
1da177e4 LT |
668 | break; |
669 | } | |
3b1e0a65 | 670 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 671 | if (dev) |
132adf54 | 672 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 673 | } else |
55b80503 | 674 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 675 | |
1da177e4 | 676 | |
132adf54 SH |
677 | err = -EADDRNOTAVAIL; |
678 | if (!dev) | |
679 | break; | |
55b80503 | 680 | dev_put(dev); |
132adf54 SH |
681 | |
682 | err = -EINVAL; | |
683 | if (sk->sk_bound_dev_if && | |
684 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
685 | break; | |
1da177e4 | 686 | |
132adf54 SH |
687 | inet->mc_index = mreq.imr_ifindex; |
688 | inet->mc_addr = mreq.imr_address.s_addr; | |
689 | err = 0; | |
690 | break; | |
691 | } | |
1da177e4 | 692 | |
132adf54 SH |
693 | case IP_ADD_MEMBERSHIP: |
694 | case IP_DROP_MEMBERSHIP: | |
695 | { | |
696 | struct ip_mreqn mreq; | |
1da177e4 | 697 | |
a96fb49b FL |
698 | err = -EPROTO; |
699 | if (inet_sk(sk)->is_icsk) | |
700 | break; | |
701 | ||
132adf54 SH |
702 | if (optlen < sizeof(struct ip_mreq)) |
703 | goto e_inval; | |
704 | err = -EFAULT; | |
705 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 706 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 707 | break; |
132adf54 SH |
708 | } else { |
709 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 710 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 711 | break; |
132adf54 | 712 | } |
1da177e4 | 713 | |
132adf54 SH |
714 | if (optname == IP_ADD_MEMBERSHIP) |
715 | err = ip_mc_join_group(sk, &mreq); | |
716 | else | |
717 | err = ip_mc_leave_group(sk, &mreq); | |
718 | break; | |
719 | } | |
720 | case IP_MSFILTER: | |
721 | { | |
132adf54 SH |
722 | struct ip_msfilter *msf; |
723 | ||
724 | if (optlen < IP_MSFILTER_SIZE(0)) | |
725 | goto e_inval; | |
726 | if (optlen > sysctl_optmem_max) { | |
727 | err = -ENOBUFS; | |
1da177e4 LT |
728 | break; |
729 | } | |
132adf54 | 730 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 731 | if (!msf) { |
132adf54 SH |
732 | err = -ENOBUFS; |
733 | break; | |
734 | } | |
735 | err = -EFAULT; | |
736 | if (copy_from_user(msf, optval, optlen)) { | |
737 | kfree(msf); | |
738 | break; | |
739 | } | |
740 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
741 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
742 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
743 | kfree(msf); | |
744 | err = -ENOBUFS; | |
745 | break; | |
746 | } | |
747 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
748 | kfree(msf); | |
749 | err = -EINVAL; | |
750 | break; | |
751 | } | |
752 | err = ip_mc_msfilter(sk, msf, 0); | |
753 | kfree(msf); | |
754 | break; | |
755 | } | |
756 | case IP_BLOCK_SOURCE: | |
757 | case IP_UNBLOCK_SOURCE: | |
758 | case IP_ADD_SOURCE_MEMBERSHIP: | |
759 | case IP_DROP_SOURCE_MEMBERSHIP: | |
760 | { | |
761 | struct ip_mreq_source mreqs; | |
762 | int omode, add; | |
1da177e4 | 763 | |
132adf54 SH |
764 | if (optlen != sizeof(struct ip_mreq_source)) |
765 | goto e_inval; | |
766 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 767 | err = -EFAULT; |
1da177e4 LT |
768 | break; |
769 | } | |
132adf54 SH |
770 | if (optname == IP_BLOCK_SOURCE) { |
771 | omode = MCAST_EXCLUDE; | |
772 | add = 1; | |
773 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
774 | omode = MCAST_EXCLUDE; | |
775 | add = 0; | |
776 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
777 | struct ip_mreqn mreq; | |
1da177e4 | 778 | |
132adf54 SH |
779 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
780 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
781 | mreq.imr_ifindex = 0; | |
782 | err = ip_mc_join_group(sk, &mreq); | |
783 | if (err && err != -EADDRINUSE) | |
1da177e4 | 784 | break; |
132adf54 SH |
785 | omode = MCAST_INCLUDE; |
786 | add = 1; | |
787 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
788 | omode = MCAST_INCLUDE; | |
789 | add = 0; | |
790 | } | |
791 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
792 | break; | |
793 | } | |
794 | case MCAST_JOIN_GROUP: | |
795 | case MCAST_LEAVE_GROUP: | |
796 | { | |
797 | struct group_req greq; | |
798 | struct sockaddr_in *psin; | |
799 | struct ip_mreqn mreq; | |
800 | ||
801 | if (optlen < sizeof(struct group_req)) | |
802 | goto e_inval; | |
803 | err = -EFAULT; | |
804 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
805 | break; | |
806 | psin = (struct sockaddr_in *)&greq.gr_group; | |
807 | if (psin->sin_family != AF_INET) | |
808 | goto e_inval; | |
809 | memset(&mreq, 0, sizeof(mreq)); | |
810 | mreq.imr_multiaddr = psin->sin_addr; | |
811 | mreq.imr_ifindex = greq.gr_interface; | |
812 | ||
813 | if (optname == MCAST_JOIN_GROUP) | |
814 | err = ip_mc_join_group(sk, &mreq); | |
815 | else | |
816 | err = ip_mc_leave_group(sk, &mreq); | |
817 | break; | |
818 | } | |
819 | case MCAST_JOIN_SOURCE_GROUP: | |
820 | case MCAST_LEAVE_SOURCE_GROUP: | |
821 | case MCAST_BLOCK_SOURCE: | |
822 | case MCAST_UNBLOCK_SOURCE: | |
823 | { | |
824 | struct group_source_req greqs; | |
825 | struct ip_mreq_source mreqs; | |
826 | struct sockaddr_in *psin; | |
827 | int omode, add; | |
828 | ||
829 | if (optlen != sizeof(struct group_source_req)) | |
830 | goto e_inval; | |
831 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 832 | err = -EFAULT; |
1da177e4 LT |
833 | break; |
834 | } | |
132adf54 SH |
835 | if (greqs.gsr_group.ss_family != AF_INET || |
836 | greqs.gsr_source.ss_family != AF_INET) { | |
837 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
838 | break; |
839 | } | |
132adf54 SH |
840 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
841 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
842 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
843 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
844 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
845 | ||
846 | if (optname == MCAST_BLOCK_SOURCE) { | |
847 | omode = MCAST_EXCLUDE; | |
848 | add = 1; | |
849 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
850 | omode = MCAST_EXCLUDE; | |
851 | add = 0; | |
852 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
853 | struct ip_mreqn mreq; |
854 | ||
132adf54 | 855 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 856 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
857 | mreq.imr_address.s_addr = 0; |
858 | mreq.imr_ifindex = greqs.gsr_interface; | |
859 | err = ip_mc_join_group(sk, &mreq); | |
860 | if (err && err != -EADDRINUSE) | |
861 | break; | |
862 | greqs.gsr_interface = mreq.imr_ifindex; | |
863 | omode = MCAST_INCLUDE; | |
864 | add = 1; | |
865 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
866 | omode = MCAST_INCLUDE; | |
867 | add = 0; | |
868 | } | |
869 | err = ip_mc_source(add, omode, sk, &mreqs, | |
870 | greqs.gsr_interface); | |
871 | break; | |
872 | } | |
873 | case MCAST_MSFILTER: | |
874 | { | |
132adf54 SH |
875 | struct sockaddr_in *psin; |
876 | struct ip_msfilter *msf = NULL; | |
877 | struct group_filter *gsf = NULL; | |
878 | int msize, i, ifindex; | |
879 | ||
880 | if (optlen < GROUP_FILTER_SIZE(0)) | |
881 | goto e_inval; | |
882 | if (optlen > sysctl_optmem_max) { | |
883 | err = -ENOBUFS; | |
1da177e4 LT |
884 | break; |
885 | } | |
09cb105e | 886 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 887 | if (!gsf) { |
132adf54 | 888 | err = -ENOBUFS; |
1da177e4 LT |
889 | break; |
890 | } | |
132adf54 | 891 | err = -EFAULT; |
4d52cfbe | 892 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 893 | goto mc_msf_out; |
4d52cfbe | 894 | |
132adf54 SH |
895 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
896 | if (gsf->gf_numsrc >= 0x1ffffff || | |
897 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
898 | err = -ENOBUFS; | |
899 | goto mc_msf_out; | |
900 | } | |
901 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
902 | err = -EINVAL; | |
903 | goto mc_msf_out; | |
904 | } | |
905 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 906 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 907 | if (!msf) { |
132adf54 SH |
908 | err = -ENOBUFS; |
909 | goto mc_msf_out; | |
910 | } | |
911 | ifindex = gsf->gf_interface; | |
912 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
913 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 914 | err = -EADDRNOTAVAIL; |
132adf54 | 915 | goto mc_msf_out; |
1da177e4 | 916 | } |
132adf54 SH |
917 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
918 | msf->imsf_interface = 0; | |
919 | msf->imsf_fmode = gsf->gf_fmode; | |
920 | msf->imsf_numsrc = gsf->gf_numsrc; | |
921 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 922 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 923 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 924 | |
132adf54 SH |
925 | if (psin->sin_family != AF_INET) |
926 | goto mc_msf_out; | |
927 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
928 | } | |
929 | kfree(gsf); | |
930 | gsf = NULL; | |
931 | ||
932 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 933 | mc_msf_out: |
132adf54 SH |
934 | kfree(msf); |
935 | kfree(gsf); | |
936 | break; | |
937 | } | |
f771bef9 NS |
938 | case IP_MULTICAST_ALL: |
939 | if (optlen < 1) | |
940 | goto e_inval; | |
941 | if (val != 0 && val != 1) | |
942 | goto e_inval; | |
943 | inet->mc_all = val; | |
944 | break; | |
132adf54 SH |
945 | case IP_ROUTER_ALERT: |
946 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
947 | break; | |
948 | ||
949 | case IP_FREEBIND: | |
4d52cfbe | 950 | if (optlen < 1) |
132adf54 SH |
951 | goto e_inval; |
952 | inet->freebind = !!val; | |
953 | break; | |
954 | ||
955 | case IP_IPSEC_POLICY: | |
956 | case IP_XFRM_POLICY: | |
957 | err = -EPERM; | |
958 | if (!capable(CAP_NET_ADMIN)) | |
1da177e4 | 959 | break; |
132adf54 SH |
960 | err = xfrm_user_policy(sk, optname, optval, optlen); |
961 | break; | |
1da177e4 | 962 | |
f5715aea KK |
963 | case IP_TRANSPARENT: |
964 | if (!capable(CAP_NET_ADMIN)) { | |
965 | err = -EPERM; | |
966 | break; | |
967 | } | |
968 | if (optlen < 1) | |
969 | goto e_inval; | |
970 | inet->transparent = !!val; | |
971 | break; | |
972 | ||
d218d111 SH |
973 | case IP_MINTTL: |
974 | if (optlen < 1) | |
975 | goto e_inval; | |
976 | if (val < 0 || val > 255) | |
977 | goto e_inval; | |
978 | inet->min_ttl = val; | |
979 | break; | |
980 | ||
132adf54 SH |
981 | default: |
982 | err = -ENOPROTOOPT; | |
983 | break; | |
1da177e4 LT |
984 | } |
985 | release_sock(sk); | |
986 | return err; | |
987 | ||
988 | e_inval: | |
989 | release_sock(sk); | |
990 | return -EINVAL; | |
991 | } | |
992 | ||
f84af32c ED |
993 | /** |
994 | * ip_queue_rcv_skb - Queue an skb into sock receive queue | |
995 | * @sk: socket | |
996 | * @skb: buffer | |
997 | * | |
998 | * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option | |
999 | * is not set, we drop skb dst entry now, while dst cache line is hot. | |
1000 | */ | |
1001 | int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1002 | { | |
1003 | if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO)) | |
1004 | skb_dst_drop(skb); | |
1005 | return sock_queue_rcv_skb(sk, skb); | |
1006 | } | |
1007 | EXPORT_SYMBOL(ip_queue_rcv_skb); | |
1008 | ||
3fdadf7d | 1009 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1010 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1011 | { |
1012 | int err; | |
1013 | ||
1014 | if (level != SOL_IP) | |
1015 | return -ENOPROTOOPT; | |
1016 | ||
1017 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1018 | #ifdef CONFIG_NETFILTER | |
1019 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1020 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1021 | optname != IP_IPSEC_POLICY && |
1022 | optname != IP_XFRM_POLICY && | |
1023 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1024 | lock_sock(sk); |
1025 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1026 | release_sock(sk); | |
1027 | } | |
1028 | #endif | |
1029 | return err; | |
1030 | } | |
4d52cfbe | 1031 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1032 | |
1033 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1034 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1035 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1036 | { |
1037 | int err; | |
1038 | ||
1039 | if (level != SOL_IP) | |
1040 | return -ENOPROTOOPT; | |
1041 | ||
dae50295 DS |
1042 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1043 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1044 | ip_setsockopt); | |
1045 | ||
3fdadf7d DM |
1046 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1047 | #ifdef CONFIG_NETFILTER | |
1048 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1049 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1050 | optname != IP_IPSEC_POLICY && |
1051 | optname != IP_XFRM_POLICY && | |
1052 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1053 | lock_sock(sk); |
543d9cfe ACM |
1054 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1055 | optval, optlen); | |
3fdadf7d DM |
1056 | release_sock(sk); |
1057 | } | |
1058 | #endif | |
1059 | return err; | |
1060 | } | |
543d9cfe | 1061 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1062 | #endif |
1063 | ||
1da177e4 | 1064 | /* |
4d52cfbe ED |
1065 | * Get the options. Note for future reference. The GET of IP options gets |
1066 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1067 | */ |
1068 | ||
3fdadf7d | 1069 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
132adf54 | 1070 | char __user *optval, int __user *optlen) |
1da177e4 LT |
1071 | { |
1072 | struct inet_sock *inet = inet_sk(sk); | |
1073 | int val; | |
1074 | int len; | |
e905a9ed | 1075 | |
132adf54 | 1076 | if (level != SOL_IP) |
1da177e4 LT |
1077 | return -EOPNOTSUPP; |
1078 | ||
6a9fb947 | 1079 | if (ip_mroute_opt(optname)) |
09cb105e | 1080 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1081 | |
09cb105e | 1082 | if (get_user(len, optlen)) |
1da177e4 | 1083 | return -EFAULT; |
132adf54 | 1084 | if (len < 0) |
1da177e4 | 1085 | return -EINVAL; |
e905a9ed | 1086 | |
1da177e4 LT |
1087 | lock_sock(sk); |
1088 | ||
132adf54 SH |
1089 | switch (optname) { |
1090 | case IP_OPTIONS: | |
1091 | { | |
1092 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1093 | struct ip_options *opt = (struct ip_options *)optbuf; |
1094 | struct ip_options_rcu *inet_opt; | |
1095 | ||
1096 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1097 | sock_owned_by_user(sk)); | |
132adf54 | 1098 | opt->optlen = 0; |
f6d8bd05 ED |
1099 | if (inet_opt) |
1100 | memcpy(optbuf, &inet_opt->opt, | |
1101 | sizeof(struct ip_options) + | |
1102 | inet_opt->opt.optlen); | |
132adf54 SH |
1103 | release_sock(sk); |
1104 | ||
1105 | if (opt->optlen == 0) | |
1106 | return put_user(0, optlen); | |
1107 | ||
1108 | ip_options_undo(opt); | |
1109 | ||
1110 | len = min_t(unsigned int, len, opt->optlen); | |
1111 | if (put_user(len, optlen)) | |
1112 | return -EFAULT; | |
1113 | if (copy_to_user(optval, opt->__data, len)) | |
1114 | return -EFAULT; | |
1115 | return 0; | |
1116 | } | |
1117 | case IP_PKTINFO: | |
1118 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1119 | break; | |
1120 | case IP_RECVTTL: | |
1121 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1122 | break; | |
1123 | case IP_RECVTOS: | |
1124 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1125 | break; | |
1126 | case IP_RECVOPTS: | |
1127 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1128 | break; | |
1129 | case IP_RETOPTS: | |
1130 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1131 | break; | |
1132 | case IP_PASSSEC: | |
1133 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1134 | break; | |
e8b2dfe9 BS |
1135 | case IP_RECVORIGDSTADDR: |
1136 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1137 | break; | |
132adf54 SH |
1138 | case IP_TOS: |
1139 | val = inet->tos; | |
1140 | break; | |
1141 | case IP_TTL: | |
1142 | val = (inet->uc_ttl == -1 ? | |
1143 | sysctl_ip_default_ttl : | |
1144 | inet->uc_ttl); | |
1145 | break; | |
1146 | case IP_HDRINCL: | |
1147 | val = inet->hdrincl; | |
1148 | break; | |
a89b4763 MK |
1149 | case IP_NODEFRAG: |
1150 | val = inet->nodefrag; | |
1151 | break; | |
132adf54 SH |
1152 | case IP_MTU_DISCOVER: |
1153 | val = inet->pmtudisc; | |
1154 | break; | |
1155 | case IP_MTU: | |
1156 | { | |
1157 | struct dst_entry *dst; | |
1158 | val = 0; | |
1159 | dst = sk_dst_get(sk); | |
1160 | if (dst) { | |
1161 | val = dst_mtu(dst); | |
1162 | dst_release(dst); | |
1da177e4 | 1163 | } |
132adf54 | 1164 | if (!val) { |
1da177e4 | 1165 | release_sock(sk); |
132adf54 | 1166 | return -ENOTCONN; |
1da177e4 | 1167 | } |
132adf54 SH |
1168 | break; |
1169 | } | |
1170 | case IP_RECVERR: | |
1171 | val = inet->recverr; | |
1172 | break; | |
1173 | case IP_MULTICAST_TTL: | |
1174 | val = inet->mc_ttl; | |
1175 | break; | |
1176 | case IP_MULTICAST_LOOP: | |
1177 | val = inet->mc_loop; | |
1178 | break; | |
1179 | case IP_MULTICAST_IF: | |
1180 | { | |
1181 | struct in_addr addr; | |
1182 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1183 | addr.s_addr = inet->mc_addr; | |
1184 | release_sock(sk); | |
1da177e4 | 1185 | |
132adf54 SH |
1186 | if (put_user(len, optlen)) |
1187 | return -EFAULT; | |
1188 | if (copy_to_user(optval, &addr, len)) | |
1189 | return -EFAULT; | |
1190 | return 0; | |
1191 | } | |
1192 | case IP_MSFILTER: | |
1193 | { | |
1194 | struct ip_msfilter msf; | |
1195 | int err; | |
1196 | ||
1197 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1198 | release_sock(sk); |
132adf54 | 1199 | return -EINVAL; |
1da177e4 | 1200 | } |
132adf54 | 1201 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1202 | release_sock(sk); |
132adf54 | 1203 | return -EFAULT; |
1da177e4 | 1204 | } |
132adf54 SH |
1205 | err = ip_mc_msfget(sk, &msf, |
1206 | (struct ip_msfilter __user *)optval, optlen); | |
1207 | release_sock(sk); | |
1208 | return err; | |
1209 | } | |
1210 | case MCAST_MSFILTER: | |
1211 | { | |
1212 | struct group_filter gsf; | |
1213 | int err; | |
1da177e4 | 1214 | |
132adf54 | 1215 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1216 | release_sock(sk); |
132adf54 SH |
1217 | return -EINVAL; |
1218 | } | |
1219 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1220 | release_sock(sk); | |
1221 | return -EFAULT; | |
1222 | } | |
1223 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1224 | (struct group_filter __user *)optval, |
1225 | optlen); | |
132adf54 SH |
1226 | release_sock(sk); |
1227 | return err; | |
1228 | } | |
f771bef9 NS |
1229 | case IP_MULTICAST_ALL: |
1230 | val = inet->mc_all; | |
1231 | break; | |
132adf54 SH |
1232 | case IP_PKTOPTIONS: |
1233 | { | |
1234 | struct msghdr msg; | |
1da177e4 | 1235 | |
132adf54 | 1236 | release_sock(sk); |
1da177e4 | 1237 | |
132adf54 SH |
1238 | if (sk->sk_type != SOCK_STREAM) |
1239 | return -ENOPROTOOPT; | |
1da177e4 | 1240 | |
132adf54 SH |
1241 | msg.msg_control = optval; |
1242 | msg.msg_controllen = len; | |
1243 | msg.msg_flags = 0; | |
1da177e4 | 1244 | |
132adf54 SH |
1245 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1246 | struct in_pktinfo info; | |
1247 | ||
c720c7e8 ED |
1248 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1249 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1250 | info.ipi_ifindex = inet->mc_index; |
1251 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1252 | } |
132adf54 SH |
1253 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1254 | int hlim = inet->mc_ttl; | |
1255 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1256 | } | |
1257 | len -= msg.msg_controllen; | |
1258 | return put_user(len, optlen); | |
1259 | } | |
1260 | case IP_FREEBIND: | |
1261 | val = inet->freebind; | |
1262 | break; | |
f5715aea KK |
1263 | case IP_TRANSPARENT: |
1264 | val = inet->transparent; | |
1265 | break; | |
d218d111 SH |
1266 | case IP_MINTTL: |
1267 | val = inet->min_ttl; | |
1268 | break; | |
132adf54 SH |
1269 | default: |
1270 | release_sock(sk); | |
1271 | return -ENOPROTOOPT; | |
1da177e4 LT |
1272 | } |
1273 | release_sock(sk); | |
e905a9ed | 1274 | |
4d52cfbe | 1275 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1276 | unsigned char ucval = (unsigned char)val; |
1277 | len = 1; | |
132adf54 | 1278 | if (put_user(len, optlen)) |
1da177e4 | 1279 | return -EFAULT; |
09cb105e | 1280 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1281 | return -EFAULT; |
1282 | } else { | |
1283 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1284 | if (put_user(len, optlen)) |
1da177e4 | 1285 | return -EFAULT; |
09cb105e | 1286 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1287 | return -EFAULT; |
1288 | } | |
1289 | return 0; | |
1290 | } | |
1291 | ||
3fdadf7d | 1292 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1293 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1294 | { |
1295 | int err; | |
1296 | ||
1297 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); | |
1298 | #ifdef CONFIG_NETFILTER | |
1299 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1300 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1301 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1302 | int len; |
3fdadf7d | 1303 | |
09cb105e | 1304 | if (get_user(len, optlen)) |
3fdadf7d DM |
1305 | return -EFAULT; |
1306 | ||
1307 | lock_sock(sk); | |
1308 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1309 | &len); | |
1310 | release_sock(sk); | |
1311 | if (err >= 0) | |
1312 | err = put_user(len, optlen); | |
1313 | return err; | |
1314 | } | |
1315 | #endif | |
1316 | return err; | |
1317 | } | |
4d52cfbe | 1318 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1319 | |
1320 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1321 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1322 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1323 | { |
42908c69 DS |
1324 | int err; |
1325 | ||
1326 | if (optname == MCAST_MSFILTER) | |
1327 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1328 | ip_getsockopt); | |
1329 | ||
1330 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); | |
1331 | ||
3fdadf7d DM |
1332 | #ifdef CONFIG_NETFILTER |
1333 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1334 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1335 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1336 | int len; |
3fdadf7d | 1337 | |
543d9cfe | 1338 | if (get_user(len, optlen)) |
3fdadf7d DM |
1339 | return -EFAULT; |
1340 | ||
1341 | lock_sock(sk); | |
543d9cfe | 1342 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1343 | release_sock(sk); |
1344 | if (err >= 0) | |
1345 | err = put_user(len, optlen); | |
1346 | return err; | |
1347 | } | |
1348 | #endif | |
1349 | return err; | |
1350 | } | |
543d9cfe | 1351 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1352 | #endif |