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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> | |
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> |
dfd56b8b | 40 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
41 | #include <net/transp_v6.h> |
42 | #endif | |
35ebf65e | 43 | #include <net/ip_fib.h> |
1da177e4 LT |
44 | |
45 | #include <linux/errqueue.h> | |
46 | #include <asm/uaccess.h> | |
47 | ||
48 | #define IP_CMSG_PKTINFO 1 | |
49 | #define IP_CMSG_TTL 2 | |
50 | #define IP_CMSG_TOS 4 | |
51 | #define IP_CMSG_RECVOPTS 8 | |
52 | #define IP_CMSG_RETOPTS 16 | |
2c7946a7 | 53 | #define IP_CMSG_PASSSEC 32 |
e8b2dfe9 | 54 | #define IP_CMSG_ORIGDSTADDR 64 |
1da177e4 LT |
55 | |
56 | /* | |
57 | * SOL_IP control messages. | |
58 | */ | |
d826eb14 | 59 | #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb)) |
1da177e4 LT |
60 | |
61 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
62 | { | |
d826eb14 | 63 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 64 | |
eddc9ec5 | 65 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
66 | |
67 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
68 | } | |
69 | ||
70 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
71 | { | |
eddc9ec5 | 72 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
73 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
74 | } | |
75 | ||
76 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
77 | { | |
eddc9ec5 | 78 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
79 | } |
80 | ||
81 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
82 | { | |
83 | if (IPCB(skb)->opt.optlen == 0) | |
84 | return; | |
85 | ||
eddc9ec5 ACM |
86 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
87 | ip_hdr(skb) + 1); | |
1da177e4 LT |
88 | } |
89 | ||
90 | ||
91 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
92 | { | |
93 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 94 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
95 | |
96 | if (IPCB(skb)->opt.optlen == 0) | |
97 | return; | |
98 | ||
99 | if (ip_options_echo(opt, skb)) { | |
100 | msg->msg_flags |= MSG_CTRUNC; | |
101 | return; | |
102 | } | |
103 | ip_options_undo(opt); | |
104 | ||
105 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
106 | } | |
107 | ||
2c7946a7 CZ |
108 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
109 | { | |
110 | char *secdata; | |
dc49c1f9 | 111 | u32 seclen, secid; |
2c7946a7 CZ |
112 | int err; |
113 | ||
dc49c1f9 CZ |
114 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
115 | if (err) | |
116 | return; | |
117 | ||
118 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
119 | if (err) |
120 | return; | |
121 | ||
122 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 123 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
124 | } |
125 | ||
21d1a161 | 126 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
127 | { |
128 | struct sockaddr_in sin; | |
b71d1d42 | 129 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 130 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
131 | |
132 | if (skb_transport_offset(skb) + 4 > skb->len) | |
133 | return; | |
134 | ||
135 | /* All current transport protocols have the port numbers in the | |
136 | * first four bytes of the transport header and this function is | |
137 | * written with this assumption in mind. | |
138 | */ | |
139 | ||
140 | sin.sin_family = AF_INET; | |
141 | sin.sin_addr.s_addr = iph->daddr; | |
142 | sin.sin_port = ports[1]; | |
143 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
144 | ||
145 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
146 | } | |
1da177e4 LT |
147 | |
148 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) | |
149 | { | |
150 | struct inet_sock *inet = inet_sk(skb->sk); | |
95c96174 | 151 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
152 | |
153 | /* Ordered by supposed usage frequency */ | |
154 | if (flags & 1) | |
155 | ip_cmsg_recv_pktinfo(msg, skb); | |
4d52cfbe | 156 | if ((flags >>= 1) == 0) |
1da177e4 LT |
157 | return; |
158 | ||
159 | if (flags & 1) | |
160 | ip_cmsg_recv_ttl(msg, skb); | |
4d52cfbe | 161 | if ((flags >>= 1) == 0) |
1da177e4 LT |
162 | return; |
163 | ||
164 | if (flags & 1) | |
165 | ip_cmsg_recv_tos(msg, skb); | |
4d52cfbe | 166 | if ((flags >>= 1) == 0) |
1da177e4 LT |
167 | return; |
168 | ||
169 | if (flags & 1) | |
170 | ip_cmsg_recv_opts(msg, skb); | |
4d52cfbe | 171 | if ((flags >>= 1) == 0) |
1da177e4 LT |
172 | return; |
173 | ||
174 | if (flags & 1) | |
175 | ip_cmsg_recv_retopts(msg, skb); | |
4d52cfbe | 176 | if ((flags >>= 1) == 0) |
2c7946a7 CZ |
177 | return; |
178 | ||
179 | if (flags & 1) | |
180 | ip_cmsg_recv_security(msg, skb); | |
e8b2dfe9 | 181 | |
4d52cfbe | 182 | if ((flags >>= 1) == 0) |
e8b2dfe9 BS |
183 | return; |
184 | if (flags & 1) | |
185 | ip_cmsg_recv_dstaddr(msg, skb); | |
186 | ||
1da177e4 | 187 | } |
4d52cfbe | 188 | EXPORT_SYMBOL(ip_cmsg_recv); |
1da177e4 | 189 | |
7a6adb92 | 190 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
1da177e4 LT |
191 | { |
192 | int err; | |
193 | struct cmsghdr *cmsg; | |
194 | ||
195 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
196 | if (!CMSG_OK(msg, cmsg)) | |
197 | return -EINVAL; | |
198 | if (cmsg->cmsg_level != SOL_IP) | |
199 | continue; | |
200 | switch (cmsg->cmsg_type) { | |
201 | case IP_RETOPTS: | |
202 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4d52cfbe ED |
203 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
204 | err < 40 ? err : 40); | |
1da177e4 LT |
205 | if (err) |
206 | return err; | |
207 | break; | |
208 | case IP_PKTINFO: | |
209 | { | |
210 | struct in_pktinfo *info; | |
211 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
212 | return -EINVAL; | |
213 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
214 | ipc->oif = info->ipi_ifindex; | |
215 | ipc->addr = info->ipi_spec_dst.s_addr; | |
216 | break; | |
217 | } | |
218 | default: | |
219 | return -EINVAL; | |
220 | } | |
221 | } | |
222 | return 0; | |
223 | } | |
224 | ||
225 | ||
226 | /* Special input handler for packets caught by router alert option. | |
227 | They are selected only by protocol field, and then processed likely | |
228 | local ones; but only if someone wants them! Otherwise, router | |
229 | not running rsvpd will kill RSVP. | |
230 | ||
231 | It is user level problem, what it will make with them. | |
232 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
233 | but receiver should be enough clever f.e. to forward mtrace requests, | |
234 | sent to multicast group to reach destination designated router. | |
235 | */ | |
43a951e9 | 236 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
237 | static DEFINE_SPINLOCK(ip_ra_lock); |
238 | ||
592fcb9d ED |
239 | |
240 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 241 | { |
592fcb9d ED |
242 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
243 | ||
244 | sock_put(ra->saved_sk); | |
245 | kfree(ra); | |
66018506 | 246 | } |
1da177e4 | 247 | |
4d52cfbe ED |
248 | int ip_ra_control(struct sock *sk, unsigned char on, |
249 | void (*destructor)(struct sock *)) | |
1da177e4 | 250 | { |
43a951e9 ED |
251 | struct ip_ra_chain *ra, *new_ra; |
252 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 253 | |
c720c7e8 | 254 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
255 | return -EINVAL; |
256 | ||
257 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
258 | ||
66018506 | 259 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
260 | for (rap = &ip_ra_chain; |
261 | (ra = rcu_dereference_protected(*rap, | |
262 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
263 | rap = &ra->next) { | |
1da177e4 LT |
264 | if (ra->sk == sk) { |
265 | if (on) { | |
66018506 | 266 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 267 | kfree(new_ra); |
1da177e4 LT |
268 | return -EADDRINUSE; |
269 | } | |
592fcb9d ED |
270 | /* dont let ip_call_ra_chain() use sk again */ |
271 | ra->sk = NULL; | |
66018506 ED |
272 | rcu_assign_pointer(*rap, ra->next); |
273 | spin_unlock_bh(&ip_ra_lock); | |
1da177e4 LT |
274 | |
275 | if (ra->destructor) | |
276 | ra->destructor(sk); | |
592fcb9d ED |
277 | /* |
278 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
279 | * period. This guarantee ip_call_ra_chain() dont need | |
280 | * to mess with socket refcounts. | |
281 | */ | |
282 | ra->saved_sk = sk; | |
283 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
284 | return 0; |
285 | } | |
286 | } | |
287 | if (new_ra == NULL) { | |
66018506 | 288 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
289 | return -ENOBUFS; |
290 | } | |
291 | new_ra->sk = sk; | |
292 | new_ra->destructor = destructor; | |
293 | ||
294 | new_ra->next = ra; | |
66018506 | 295 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 296 | sock_hold(sk); |
66018506 | 297 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
298 | |
299 | return 0; | |
300 | } | |
301 | ||
e905a9ed | 302 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 303 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 304 | { |
1da177e4 LT |
305 | struct sock_exterr_skb *serr; |
306 | ||
1da177e4 LT |
307 | skb = skb_clone(skb, GFP_ATOMIC); |
308 | if (!skb) | |
309 | return; | |
310 | ||
e905a9ed | 311 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
312 | serr->ee.ee_errno = err; |
313 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
314 | serr->ee.ee_type = icmp_hdr(skb)->type; |
315 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
316 | serr->ee.ee_pad = 0; |
317 | serr->ee.ee_info = info; | |
318 | serr->ee.ee_data = 0; | |
88c7664f | 319 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 320 | skb_network_header(skb); |
1da177e4 LT |
321 | serr->port = port; |
322 | ||
bd82393c ACM |
323 | if (skb_pull(skb, payload - skb->data) != NULL) { |
324 | skb_reset_transport_header(skb); | |
325 | if (sock_queue_err_skb(sk, skb) == 0) | |
326 | return; | |
327 | } | |
328 | kfree_skb(skb); | |
1da177e4 LT |
329 | } |
330 | ||
0579016e | 331 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
332 | { |
333 | struct inet_sock *inet = inet_sk(sk); | |
334 | struct sock_exterr_skb *serr; | |
335 | struct iphdr *iph; | |
336 | struct sk_buff *skb; | |
337 | ||
338 | if (!inet->recverr) | |
339 | return; | |
340 | ||
341 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
342 | if (!skb) | |
343 | return; | |
344 | ||
2ca9e6f2 ACM |
345 | skb_put(skb, sizeof(struct iphdr)); |
346 | skb_reset_network_header(skb); | |
eddc9ec5 | 347 | iph = ip_hdr(skb); |
1da177e4 LT |
348 | iph->daddr = daddr; |
349 | ||
e905a9ed | 350 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
351 | serr->ee.ee_errno = err; |
352 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 353 | serr->ee.ee_type = 0; |
1da177e4 LT |
354 | serr->ee.ee_code = 0; |
355 | serr->ee.ee_pad = 0; | |
356 | serr->ee.ee_info = info; | |
357 | serr->ee.ee_data = 0; | |
d56f90a7 | 358 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
359 | serr->port = port; |
360 | ||
27a884dc | 361 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 362 | skb_reset_transport_header(skb); |
1da177e4 LT |
363 | |
364 | if (sock_queue_err_skb(sk, skb)) | |
365 | kfree_skb(skb); | |
366 | } | |
367 | ||
e905a9ed | 368 | /* |
1da177e4 LT |
369 | * Handle MSG_ERRQUEUE |
370 | */ | |
371 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
372 | { | |
373 | struct sock_exterr_skb *serr; | |
374 | struct sk_buff *skb, *skb2; | |
375 | struct sockaddr_in *sin; | |
376 | struct { | |
377 | struct sock_extended_err ee; | |
378 | struct sockaddr_in offender; | |
379 | } errhdr; | |
380 | int err; | |
381 | int copied; | |
382 | ||
383 | err = -EAGAIN; | |
384 | skb = skb_dequeue(&sk->sk_error_queue); | |
385 | if (skb == NULL) | |
386 | goto out; | |
387 | ||
388 | copied = skb->len; | |
389 | if (copied > len) { | |
390 | msg->msg_flags |= MSG_TRUNC; | |
391 | copied = len; | |
392 | } | |
393 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
394 | if (err) | |
395 | goto out_free_skb; | |
396 | ||
397 | sock_recv_timestamp(msg, sk, skb); | |
398 | ||
399 | serr = SKB_EXT_ERR(skb); | |
400 | ||
401 | sin = (struct sockaddr_in *)msg->msg_name; | |
402 | if (sin) { | |
403 | sin->sin_family = AF_INET; | |
d56f90a7 ACM |
404 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
405 | serr->addr_offset); | |
1da177e4 LT |
406 | sin->sin_port = serr->port; |
407 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
408 | } | |
409 | ||
410 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
411 | sin = &errhdr.offender; | |
412 | sin->sin_family = AF_UNSPEC; | |
413 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { | |
414 | struct inet_sock *inet = inet_sk(sk); | |
415 | ||
416 | sin->sin_family = AF_INET; | |
eddc9ec5 | 417 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
418 | sin->sin_port = 0; |
419 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
420 | if (inet->cmsg_flags) | |
421 | ip_cmsg_recv(msg, skb); | |
422 | } | |
423 | ||
424 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
425 | ||
426 | /* Now we could try to dump offended packet options */ | |
427 | ||
428 | msg->msg_flags |= MSG_ERRQUEUE; | |
429 | err = copied; | |
430 | ||
431 | /* Reset and regenerate socket error */ | |
e0f9f858 | 432 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 433 | sk->sk_err = 0; |
4d52cfbe ED |
434 | skb2 = skb_peek(&sk->sk_error_queue); |
435 | if (skb2 != NULL) { | |
1da177e4 | 436 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
e0f9f858 | 437 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
438 | sk->sk_error_report(sk); |
439 | } else | |
e0f9f858 | 440 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 441 | |
e905a9ed | 442 | out_free_skb: |
1da177e4 LT |
443 | kfree_skb(skb); |
444 | out: | |
445 | return err; | |
446 | } | |
447 | ||
448 | ||
449 | /* | |
4d52cfbe ED |
450 | * Socket option code for IP. This is the end of the line after any |
451 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
452 | */ |
453 | ||
3fdadf7d | 454 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 455 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
456 | { |
457 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 458 | int val = 0, err; |
1da177e4 | 459 | |
0c9f79be XW |
460 | switch (optname) { |
461 | case IP_PKTINFO: | |
462 | case IP_RECVTTL: | |
463 | case IP_RECVOPTS: | |
464 | case IP_RECVTOS: | |
465 | case IP_RETOPTS: | |
466 | case IP_TOS: | |
467 | case IP_TTL: | |
468 | case IP_HDRINCL: | |
469 | case IP_MTU_DISCOVER: | |
470 | case IP_RECVERR: | |
471 | case IP_ROUTER_ALERT: | |
472 | case IP_FREEBIND: | |
473 | case IP_PASSSEC: | |
474 | case IP_TRANSPARENT: | |
475 | case IP_MINTTL: | |
476 | case IP_NODEFRAG: | |
477 | case IP_UNICAST_IF: | |
478 | case IP_MULTICAST_TTL: | |
479 | case IP_MULTICAST_ALL: | |
480 | case IP_MULTICAST_LOOP: | |
481 | case 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); | |
dfd56b8b | 517 | #if IS_ENABLED(CONFIG_IPV6) |
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); |
dfd56b8b | 528 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 529 | } |
132adf54 | 530 | #endif |
1da177e4 | 531 | } |
f6d8bd05 ED |
532 | rcu_assign_pointer(inet->inet_opt, opt); |
533 | if (old) | |
605b4afe | 534 | kfree_rcu(old, 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) { | |
2c67e9ac MŻ |
581 | val &= ~INET_ECN_MASK; |
582 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 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; | |
76e21053 EH |
637 | case IP_UNICAST_IF: |
638 | { | |
639 | struct net_device *dev = NULL; | |
640 | int ifindex; | |
641 | ||
642 | if (optlen != sizeof(int)) | |
643 | goto e_inval; | |
644 | ||
645 | ifindex = (__force int)ntohl((__force __be32)val); | |
646 | if (ifindex == 0) { | |
647 | inet->uc_index = 0; | |
648 | err = 0; | |
649 | break; | |
650 | } | |
651 | ||
652 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
653 | err = -EADDRNOTAVAIL; | |
654 | if (!dev) | |
655 | break; | |
656 | dev_put(dev); | |
657 | ||
658 | err = -EINVAL; | |
659 | if (sk->sk_bound_dev_if) | |
660 | break; | |
661 | ||
662 | inet->uc_index = ifindex; | |
663 | err = 0; | |
664 | break; | |
665 | } | |
132adf54 SH |
666 | case IP_MULTICAST_IF: |
667 | { | |
668 | struct ip_mreqn mreq; | |
669 | struct net_device *dev = NULL; | |
670 | ||
671 | if (sk->sk_type == SOCK_STREAM) | |
672 | goto e_inval; | |
673 | /* | |
674 | * Check the arguments are allowable | |
675 | */ | |
676 | ||
0915921b SW |
677 | if (optlen < sizeof(struct in_addr)) |
678 | goto e_inval; | |
679 | ||
132adf54 SH |
680 | err = -EFAULT; |
681 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 682 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 683 | break; |
132adf54 SH |
684 | } else { |
685 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
686 | if (optlen >= sizeof(struct ip_mreq)) { |
687 | if (copy_from_user(&mreq, optval, | |
688 | sizeof(struct ip_mreq))) | |
689 | break; | |
690 | } else if (optlen >= sizeof(struct in_addr)) { | |
691 | if (copy_from_user(&mreq.imr_address, optval, | |
692 | sizeof(struct in_addr))) | |
693 | break; | |
694 | } | |
132adf54 SH |
695 | } |
696 | ||
697 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 698 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
699 | inet->mc_index = 0; |
700 | inet->mc_addr = 0; | |
701 | err = 0; | |
1da177e4 LT |
702 | break; |
703 | } | |
3b1e0a65 | 704 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 705 | if (dev) |
132adf54 | 706 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 707 | } else |
55b80503 | 708 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 709 | |
1da177e4 | 710 | |
132adf54 SH |
711 | err = -EADDRNOTAVAIL; |
712 | if (!dev) | |
713 | break; | |
55b80503 | 714 | dev_put(dev); |
132adf54 SH |
715 | |
716 | err = -EINVAL; | |
717 | if (sk->sk_bound_dev_if && | |
718 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
719 | break; | |
1da177e4 | 720 | |
132adf54 SH |
721 | inet->mc_index = mreq.imr_ifindex; |
722 | inet->mc_addr = mreq.imr_address.s_addr; | |
723 | err = 0; | |
724 | break; | |
725 | } | |
1da177e4 | 726 | |
132adf54 SH |
727 | case IP_ADD_MEMBERSHIP: |
728 | case IP_DROP_MEMBERSHIP: | |
729 | { | |
730 | struct ip_mreqn mreq; | |
1da177e4 | 731 | |
a96fb49b FL |
732 | err = -EPROTO; |
733 | if (inet_sk(sk)->is_icsk) | |
734 | break; | |
735 | ||
132adf54 SH |
736 | if (optlen < sizeof(struct ip_mreq)) |
737 | goto e_inval; | |
738 | err = -EFAULT; | |
739 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 740 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 741 | break; |
132adf54 SH |
742 | } else { |
743 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 744 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 745 | break; |
132adf54 | 746 | } |
1da177e4 | 747 | |
132adf54 SH |
748 | if (optname == IP_ADD_MEMBERSHIP) |
749 | err = ip_mc_join_group(sk, &mreq); | |
750 | else | |
751 | err = ip_mc_leave_group(sk, &mreq); | |
752 | break; | |
753 | } | |
754 | case IP_MSFILTER: | |
755 | { | |
132adf54 SH |
756 | struct ip_msfilter *msf; |
757 | ||
758 | if (optlen < IP_MSFILTER_SIZE(0)) | |
759 | goto e_inval; | |
760 | if (optlen > sysctl_optmem_max) { | |
761 | err = -ENOBUFS; | |
1da177e4 LT |
762 | break; |
763 | } | |
132adf54 | 764 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 765 | if (!msf) { |
132adf54 SH |
766 | err = -ENOBUFS; |
767 | break; | |
768 | } | |
769 | err = -EFAULT; | |
770 | if (copy_from_user(msf, optval, optlen)) { | |
771 | kfree(msf); | |
772 | break; | |
773 | } | |
774 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
775 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
776 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
777 | kfree(msf); | |
778 | err = -ENOBUFS; | |
779 | break; | |
780 | } | |
781 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
782 | kfree(msf); | |
783 | err = -EINVAL; | |
784 | break; | |
785 | } | |
786 | err = ip_mc_msfilter(sk, msf, 0); | |
787 | kfree(msf); | |
788 | break; | |
789 | } | |
790 | case IP_BLOCK_SOURCE: | |
791 | case IP_UNBLOCK_SOURCE: | |
792 | case IP_ADD_SOURCE_MEMBERSHIP: | |
793 | case IP_DROP_SOURCE_MEMBERSHIP: | |
794 | { | |
795 | struct ip_mreq_source mreqs; | |
796 | int omode, add; | |
1da177e4 | 797 | |
132adf54 SH |
798 | if (optlen != sizeof(struct ip_mreq_source)) |
799 | goto e_inval; | |
800 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 801 | err = -EFAULT; |
1da177e4 LT |
802 | break; |
803 | } | |
132adf54 SH |
804 | if (optname == IP_BLOCK_SOURCE) { |
805 | omode = MCAST_EXCLUDE; | |
806 | add = 1; | |
807 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
808 | omode = MCAST_EXCLUDE; | |
809 | add = 0; | |
810 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
811 | struct ip_mreqn mreq; | |
1da177e4 | 812 | |
132adf54 SH |
813 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
814 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
815 | mreq.imr_ifindex = 0; | |
816 | err = ip_mc_join_group(sk, &mreq); | |
817 | if (err && err != -EADDRINUSE) | |
1da177e4 | 818 | break; |
132adf54 SH |
819 | omode = MCAST_INCLUDE; |
820 | add = 1; | |
821 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
822 | omode = MCAST_INCLUDE; | |
823 | add = 0; | |
824 | } | |
825 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
826 | break; | |
827 | } | |
828 | case MCAST_JOIN_GROUP: | |
829 | case MCAST_LEAVE_GROUP: | |
830 | { | |
831 | struct group_req greq; | |
832 | struct sockaddr_in *psin; | |
833 | struct ip_mreqn mreq; | |
834 | ||
835 | if (optlen < sizeof(struct group_req)) | |
836 | goto e_inval; | |
837 | err = -EFAULT; | |
838 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
839 | break; | |
840 | psin = (struct sockaddr_in *)&greq.gr_group; | |
841 | if (psin->sin_family != AF_INET) | |
842 | goto e_inval; | |
843 | memset(&mreq, 0, sizeof(mreq)); | |
844 | mreq.imr_multiaddr = psin->sin_addr; | |
845 | mreq.imr_ifindex = greq.gr_interface; | |
846 | ||
847 | if (optname == MCAST_JOIN_GROUP) | |
848 | err = ip_mc_join_group(sk, &mreq); | |
849 | else | |
850 | err = ip_mc_leave_group(sk, &mreq); | |
851 | break; | |
852 | } | |
853 | case MCAST_JOIN_SOURCE_GROUP: | |
854 | case MCAST_LEAVE_SOURCE_GROUP: | |
855 | case MCAST_BLOCK_SOURCE: | |
856 | case MCAST_UNBLOCK_SOURCE: | |
857 | { | |
858 | struct group_source_req greqs; | |
859 | struct ip_mreq_source mreqs; | |
860 | struct sockaddr_in *psin; | |
861 | int omode, add; | |
862 | ||
863 | if (optlen != sizeof(struct group_source_req)) | |
864 | goto e_inval; | |
865 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 866 | err = -EFAULT; |
1da177e4 LT |
867 | break; |
868 | } | |
132adf54 SH |
869 | if (greqs.gsr_group.ss_family != AF_INET || |
870 | greqs.gsr_source.ss_family != AF_INET) { | |
871 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
872 | break; |
873 | } | |
132adf54 SH |
874 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
875 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
876 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
877 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
878 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
879 | ||
880 | if (optname == MCAST_BLOCK_SOURCE) { | |
881 | omode = MCAST_EXCLUDE; | |
882 | add = 1; | |
883 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
884 | omode = MCAST_EXCLUDE; | |
885 | add = 0; | |
886 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
887 | struct ip_mreqn mreq; |
888 | ||
132adf54 | 889 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 890 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
891 | mreq.imr_address.s_addr = 0; |
892 | mreq.imr_ifindex = greqs.gsr_interface; | |
893 | err = ip_mc_join_group(sk, &mreq); | |
894 | if (err && err != -EADDRINUSE) | |
895 | break; | |
896 | greqs.gsr_interface = mreq.imr_ifindex; | |
897 | omode = MCAST_INCLUDE; | |
898 | add = 1; | |
899 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
900 | omode = MCAST_INCLUDE; | |
901 | add = 0; | |
902 | } | |
903 | err = ip_mc_source(add, omode, sk, &mreqs, | |
904 | greqs.gsr_interface); | |
905 | break; | |
906 | } | |
907 | case MCAST_MSFILTER: | |
908 | { | |
132adf54 SH |
909 | struct sockaddr_in *psin; |
910 | struct ip_msfilter *msf = NULL; | |
911 | struct group_filter *gsf = NULL; | |
912 | int msize, i, ifindex; | |
913 | ||
914 | if (optlen < GROUP_FILTER_SIZE(0)) | |
915 | goto e_inval; | |
916 | if (optlen > sysctl_optmem_max) { | |
917 | err = -ENOBUFS; | |
1da177e4 LT |
918 | break; |
919 | } | |
09cb105e | 920 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 921 | if (!gsf) { |
132adf54 | 922 | err = -ENOBUFS; |
1da177e4 LT |
923 | break; |
924 | } | |
132adf54 | 925 | err = -EFAULT; |
4d52cfbe | 926 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 927 | goto mc_msf_out; |
4d52cfbe | 928 | |
132adf54 SH |
929 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
930 | if (gsf->gf_numsrc >= 0x1ffffff || | |
931 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
932 | err = -ENOBUFS; | |
933 | goto mc_msf_out; | |
934 | } | |
935 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
936 | err = -EINVAL; | |
937 | goto mc_msf_out; | |
938 | } | |
939 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 940 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 941 | if (!msf) { |
132adf54 SH |
942 | err = -ENOBUFS; |
943 | goto mc_msf_out; | |
944 | } | |
945 | ifindex = gsf->gf_interface; | |
946 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
947 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 948 | err = -EADDRNOTAVAIL; |
132adf54 | 949 | goto mc_msf_out; |
1da177e4 | 950 | } |
132adf54 SH |
951 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
952 | msf->imsf_interface = 0; | |
953 | msf->imsf_fmode = gsf->gf_fmode; | |
954 | msf->imsf_numsrc = gsf->gf_numsrc; | |
955 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 956 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 957 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 958 | |
132adf54 SH |
959 | if (psin->sin_family != AF_INET) |
960 | goto mc_msf_out; | |
961 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
962 | } | |
963 | kfree(gsf); | |
964 | gsf = NULL; | |
965 | ||
966 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 967 | mc_msf_out: |
132adf54 SH |
968 | kfree(msf); |
969 | kfree(gsf); | |
970 | break; | |
971 | } | |
f771bef9 NS |
972 | case IP_MULTICAST_ALL: |
973 | if (optlen < 1) | |
974 | goto e_inval; | |
975 | if (val != 0 && val != 1) | |
976 | goto e_inval; | |
977 | inet->mc_all = val; | |
978 | break; | |
132adf54 SH |
979 | case IP_ROUTER_ALERT: |
980 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
981 | break; | |
982 | ||
983 | case IP_FREEBIND: | |
4d52cfbe | 984 | if (optlen < 1) |
132adf54 SH |
985 | goto e_inval; |
986 | inet->freebind = !!val; | |
987 | break; | |
988 | ||
989 | case IP_IPSEC_POLICY: | |
990 | case IP_XFRM_POLICY: | |
991 | err = -EPERM; | |
52e804c6 | 992 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 993 | break; |
132adf54 SH |
994 | err = xfrm_user_policy(sk, optname, optval, optlen); |
995 | break; | |
1da177e4 | 996 | |
f5715aea | 997 | case IP_TRANSPARENT: |
52e804c6 EB |
998 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
999 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1000 | err = -EPERM; |
1001 | break; | |
1002 | } | |
1003 | if (optlen < 1) | |
1004 | goto e_inval; | |
1005 | inet->transparent = !!val; | |
1006 | break; | |
1007 | ||
d218d111 SH |
1008 | case IP_MINTTL: |
1009 | if (optlen < 1) | |
1010 | goto e_inval; | |
1011 | if (val < 0 || val > 255) | |
1012 | goto e_inval; | |
1013 | inet->min_ttl = val; | |
1014 | break; | |
1015 | ||
132adf54 SH |
1016 | default: |
1017 | err = -ENOPROTOOPT; | |
1018 | break; | |
1da177e4 LT |
1019 | } |
1020 | release_sock(sk); | |
1021 | return err; | |
1022 | ||
1023 | e_inval: | |
1024 | release_sock(sk); | |
1025 | return -EINVAL; | |
1026 | } | |
1027 | ||
f84af32c | 1028 | /** |
d826eb14 | 1029 | * ipv4_pktinfo_prepare - transfert some info from rtable to skb |
f84af32c ED |
1030 | * @sk: socket |
1031 | * @skb: buffer | |
1032 | * | |
35ebf65e DM |
1033 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1034 | * destination in skb->cb[] before dst drop. | |
d826eb14 | 1035 | * This way, receiver doesnt make cache line misses to read rtable. |
f84af32c | 1036 | */ |
d826eb14 | 1037 | void ipv4_pktinfo_prepare(struct sk_buff *skb) |
f84af32c | 1038 | { |
d826eb14 | 1039 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
d826eb14 | 1040 | |
92101b3b DM |
1041 | if (skb_rtable(skb)) { |
1042 | pktinfo->ipi_ifindex = inet_iif(skb); | |
35ebf65e | 1043 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1044 | } else { |
1045 | pktinfo->ipi_ifindex = 0; | |
1046 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1047 | } | |
1048 | skb_dst_drop(skb); | |
f84af32c | 1049 | } |
f84af32c | 1050 | |
3fdadf7d | 1051 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1052 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1053 | { |
1054 | int err; | |
1055 | ||
1056 | if (level != SOL_IP) | |
1057 | return -ENOPROTOOPT; | |
1058 | ||
1059 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1060 | #ifdef CONFIG_NETFILTER | |
1061 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1062 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1063 | optname != IP_IPSEC_POLICY && |
1064 | optname != IP_XFRM_POLICY && | |
1065 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1066 | lock_sock(sk); |
1067 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1068 | release_sock(sk); | |
1069 | } | |
1070 | #endif | |
1071 | return err; | |
1072 | } | |
4d52cfbe | 1073 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1074 | |
1075 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1076 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1077 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1078 | { |
1079 | int err; | |
1080 | ||
1081 | if (level != SOL_IP) | |
1082 | return -ENOPROTOOPT; | |
1083 | ||
dae50295 DS |
1084 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1085 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1086 | ip_setsockopt); | |
1087 | ||
3fdadf7d DM |
1088 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1089 | #ifdef CONFIG_NETFILTER | |
1090 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1091 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1092 | optname != IP_IPSEC_POLICY && |
1093 | optname != IP_XFRM_POLICY && | |
1094 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1095 | lock_sock(sk); |
543d9cfe ACM |
1096 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1097 | optval, optlen); | |
3fdadf7d DM |
1098 | release_sock(sk); |
1099 | } | |
1100 | #endif | |
1101 | return err; | |
1102 | } | |
543d9cfe | 1103 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1104 | #endif |
1105 | ||
1da177e4 | 1106 | /* |
4d52cfbe ED |
1107 | * Get the options. Note for future reference. The GET of IP options gets |
1108 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1109 | */ |
1110 | ||
3fdadf7d | 1111 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1112 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1113 | { |
1114 | struct inet_sock *inet = inet_sk(sk); | |
1115 | int val; | |
1116 | int len; | |
e905a9ed | 1117 | |
132adf54 | 1118 | if (level != SOL_IP) |
1da177e4 LT |
1119 | return -EOPNOTSUPP; |
1120 | ||
6a9fb947 | 1121 | if (ip_mroute_opt(optname)) |
09cb105e | 1122 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1123 | |
09cb105e | 1124 | if (get_user(len, optlen)) |
1da177e4 | 1125 | return -EFAULT; |
132adf54 | 1126 | if (len < 0) |
1da177e4 | 1127 | return -EINVAL; |
e905a9ed | 1128 | |
1da177e4 LT |
1129 | lock_sock(sk); |
1130 | ||
132adf54 SH |
1131 | switch (optname) { |
1132 | case IP_OPTIONS: | |
1133 | { | |
1134 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1135 | struct ip_options *opt = (struct ip_options *)optbuf; |
1136 | struct ip_options_rcu *inet_opt; | |
1137 | ||
1138 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1139 | sock_owned_by_user(sk)); | |
132adf54 | 1140 | opt->optlen = 0; |
f6d8bd05 ED |
1141 | if (inet_opt) |
1142 | memcpy(optbuf, &inet_opt->opt, | |
1143 | sizeof(struct ip_options) + | |
1144 | inet_opt->opt.optlen); | |
132adf54 SH |
1145 | release_sock(sk); |
1146 | ||
1147 | if (opt->optlen == 0) | |
1148 | return put_user(0, optlen); | |
1149 | ||
1150 | ip_options_undo(opt); | |
1151 | ||
1152 | len = min_t(unsigned int, len, opt->optlen); | |
1153 | if (put_user(len, optlen)) | |
1154 | return -EFAULT; | |
1155 | if (copy_to_user(optval, opt->__data, len)) | |
1156 | return -EFAULT; | |
1157 | return 0; | |
1158 | } | |
1159 | case IP_PKTINFO: | |
1160 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1161 | break; | |
1162 | case IP_RECVTTL: | |
1163 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1164 | break; | |
1165 | case IP_RECVTOS: | |
1166 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1167 | break; | |
1168 | case IP_RECVOPTS: | |
1169 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1170 | break; | |
1171 | case IP_RETOPTS: | |
1172 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1173 | break; | |
1174 | case IP_PASSSEC: | |
1175 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1176 | break; | |
e8b2dfe9 BS |
1177 | case IP_RECVORIGDSTADDR: |
1178 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1179 | break; | |
132adf54 SH |
1180 | case IP_TOS: |
1181 | val = inet->tos; | |
1182 | break; | |
1183 | case IP_TTL: | |
1184 | val = (inet->uc_ttl == -1 ? | |
1185 | sysctl_ip_default_ttl : | |
1186 | inet->uc_ttl); | |
1187 | break; | |
1188 | case IP_HDRINCL: | |
1189 | val = inet->hdrincl; | |
1190 | break; | |
a89b4763 MK |
1191 | case IP_NODEFRAG: |
1192 | val = inet->nodefrag; | |
1193 | break; | |
132adf54 SH |
1194 | case IP_MTU_DISCOVER: |
1195 | val = inet->pmtudisc; | |
1196 | break; | |
1197 | case IP_MTU: | |
1198 | { | |
1199 | struct dst_entry *dst; | |
1200 | val = 0; | |
1201 | dst = sk_dst_get(sk); | |
1202 | if (dst) { | |
1203 | val = dst_mtu(dst); | |
1204 | dst_release(dst); | |
1da177e4 | 1205 | } |
132adf54 | 1206 | if (!val) { |
1da177e4 | 1207 | release_sock(sk); |
132adf54 | 1208 | return -ENOTCONN; |
1da177e4 | 1209 | } |
132adf54 SH |
1210 | break; |
1211 | } | |
1212 | case IP_RECVERR: | |
1213 | val = inet->recverr; | |
1214 | break; | |
1215 | case IP_MULTICAST_TTL: | |
1216 | val = inet->mc_ttl; | |
1217 | break; | |
1218 | case IP_MULTICAST_LOOP: | |
1219 | val = inet->mc_loop; | |
1220 | break; | |
76e21053 EH |
1221 | case IP_UNICAST_IF: |
1222 | val = (__force int)htonl((__u32) inet->uc_index); | |
1223 | break; | |
132adf54 SH |
1224 | case IP_MULTICAST_IF: |
1225 | { | |
1226 | struct in_addr addr; | |
1227 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1228 | addr.s_addr = inet->mc_addr; | |
1229 | release_sock(sk); | |
1da177e4 | 1230 | |
132adf54 SH |
1231 | if (put_user(len, optlen)) |
1232 | return -EFAULT; | |
1233 | if (copy_to_user(optval, &addr, len)) | |
1234 | return -EFAULT; | |
1235 | return 0; | |
1236 | } | |
1237 | case IP_MSFILTER: | |
1238 | { | |
1239 | struct ip_msfilter msf; | |
1240 | int err; | |
1241 | ||
1242 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1243 | release_sock(sk); |
132adf54 | 1244 | return -EINVAL; |
1da177e4 | 1245 | } |
132adf54 | 1246 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1247 | release_sock(sk); |
132adf54 | 1248 | return -EFAULT; |
1da177e4 | 1249 | } |
132adf54 SH |
1250 | err = ip_mc_msfget(sk, &msf, |
1251 | (struct ip_msfilter __user *)optval, optlen); | |
1252 | release_sock(sk); | |
1253 | return err; | |
1254 | } | |
1255 | case MCAST_MSFILTER: | |
1256 | { | |
1257 | struct group_filter gsf; | |
1258 | int err; | |
1da177e4 | 1259 | |
132adf54 | 1260 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1261 | release_sock(sk); |
132adf54 SH |
1262 | return -EINVAL; |
1263 | } | |
1264 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1265 | release_sock(sk); | |
1266 | return -EFAULT; | |
1267 | } | |
1268 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1269 | (struct group_filter __user *)optval, |
1270 | optlen); | |
132adf54 SH |
1271 | release_sock(sk); |
1272 | return err; | |
1273 | } | |
f771bef9 NS |
1274 | case IP_MULTICAST_ALL: |
1275 | val = inet->mc_all; | |
1276 | break; | |
132adf54 SH |
1277 | case IP_PKTOPTIONS: |
1278 | { | |
1279 | struct msghdr msg; | |
1da177e4 | 1280 | |
132adf54 | 1281 | release_sock(sk); |
1da177e4 | 1282 | |
132adf54 SH |
1283 | if (sk->sk_type != SOCK_STREAM) |
1284 | return -ENOPROTOOPT; | |
1da177e4 | 1285 | |
132adf54 SH |
1286 | msg.msg_control = optval; |
1287 | msg.msg_controllen = len; | |
dd23198e | 1288 | msg.msg_flags = flags; |
1da177e4 | 1289 | |
132adf54 SH |
1290 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1291 | struct in_pktinfo info; | |
1292 | ||
c720c7e8 ED |
1293 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1294 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1295 | info.ipi_ifindex = inet->mc_index; |
1296 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1297 | } |
132adf54 SH |
1298 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1299 | int hlim = inet->mc_ttl; | |
1300 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1301 | } | |
4c507d28 JB |
1302 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1303 | int tos = inet->rcv_tos; | |
1304 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1305 | } | |
132adf54 SH |
1306 | len -= msg.msg_controllen; |
1307 | return put_user(len, optlen); | |
1308 | } | |
1309 | case IP_FREEBIND: | |
1310 | val = inet->freebind; | |
1311 | break; | |
f5715aea KK |
1312 | case IP_TRANSPARENT: |
1313 | val = inet->transparent; | |
1314 | break; | |
d218d111 SH |
1315 | case IP_MINTTL: |
1316 | val = inet->min_ttl; | |
1317 | break; | |
132adf54 SH |
1318 | default: |
1319 | release_sock(sk); | |
1320 | return -ENOPROTOOPT; | |
1da177e4 LT |
1321 | } |
1322 | release_sock(sk); | |
e905a9ed | 1323 | |
4d52cfbe | 1324 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1325 | unsigned char ucval = (unsigned char)val; |
1326 | len = 1; | |
132adf54 | 1327 | if (put_user(len, optlen)) |
1da177e4 | 1328 | return -EFAULT; |
09cb105e | 1329 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1330 | return -EFAULT; |
1331 | } else { | |
1332 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1333 | if (put_user(len, optlen)) |
1da177e4 | 1334 | return -EFAULT; |
09cb105e | 1335 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1336 | return -EFAULT; |
1337 | } | |
1338 | return 0; | |
1339 | } | |
1340 | ||
3fdadf7d | 1341 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1342 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1343 | { |
1344 | int err; | |
1345 | ||
dd23198e | 1346 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1347 | #ifdef CONFIG_NETFILTER |
1348 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1349 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1350 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1351 | int len; |
3fdadf7d | 1352 | |
09cb105e | 1353 | if (get_user(len, optlen)) |
3fdadf7d DM |
1354 | return -EFAULT; |
1355 | ||
1356 | lock_sock(sk); | |
1357 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1358 | &len); | |
1359 | release_sock(sk); | |
1360 | if (err >= 0) | |
1361 | err = put_user(len, optlen); | |
1362 | return err; | |
1363 | } | |
1364 | #endif | |
1365 | return err; | |
1366 | } | |
4d52cfbe | 1367 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1368 | |
1369 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1370 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1371 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1372 | { |
42908c69 DS |
1373 | int err; |
1374 | ||
1375 | if (optname == MCAST_MSFILTER) | |
1376 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1377 | ip_getsockopt); | |
1378 | ||
dd23198e DB |
1379 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1380 | MSG_CMSG_COMPAT); | |
42908c69 | 1381 | |
3fdadf7d DM |
1382 | #ifdef CONFIG_NETFILTER |
1383 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1384 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1385 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1386 | int len; |
3fdadf7d | 1387 | |
543d9cfe | 1388 | if (get_user(len, optlen)) |
3fdadf7d DM |
1389 | return -EFAULT; |
1390 | ||
1391 | lock_sock(sk); | |
543d9cfe | 1392 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1393 | release_sock(sk); |
1394 | if (err >= 0) | |
1395 | err = put_user(len, optlen); | |
1396 | return err; | |
1397 | } | |
1398 | #endif | |
1399 | return err; | |
1400 | } | |
543d9cfe | 1401 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1402 | #endif |