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 | |
e905a9ed | 460 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
132adf54 SH |
461 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
462 | (1<<IP_RETOPTS) | (1<<IP_TOS) | | |
463 | (1<<IP_TTL) | (1<<IP_HDRINCL) | | |
464 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | | |
465 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | | |
d218d111 | 466 | (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) | |
7b2ff18e | 467 | (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) || |
76e21053 | 468 | optname == IP_UNICAST_IF || |
132adf54 | 469 | optname == IP_MULTICAST_TTL || |
f771bef9 | 470 | optname == IP_MULTICAST_ALL || |
e8b2dfe9 BS |
471 | optname == IP_MULTICAST_LOOP || |
472 | optname == IP_RECVORIGDSTADDR) { | |
1da177e4 LT |
473 | if (optlen >= sizeof(int)) { |
474 | if (get_user(val, (int __user *) optval)) | |
475 | return -EFAULT; | |
476 | } else if (optlen >= sizeof(char)) { | |
477 | unsigned char ucval; | |
478 | ||
479 | if (get_user(ucval, (unsigned char __user *) optval)) | |
480 | return -EFAULT; | |
481 | val = (int) ucval; | |
482 | } | |
483 | } | |
484 | ||
485 | /* If optlen==0, it is equivalent to val == 0 */ | |
486 | ||
6a9fb947 | 487 | if (ip_mroute_opt(optname)) |
09cb105e | 488 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
489 | |
490 | err = 0; | |
491 | lock_sock(sk); | |
492 | ||
493 | switch (optname) { | |
132adf54 SH |
494 | case IP_OPTIONS: |
495 | { | |
f6d8bd05 ED |
496 | struct ip_options_rcu *old, *opt = NULL; |
497 | ||
65a1c4ff | 498 | if (optlen > 40) |
132adf54 | 499 | goto e_inval; |
3b1e0a65 | 500 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 501 | optval, optlen); |
132adf54 SH |
502 | if (err) |
503 | break; | |
f6d8bd05 ED |
504 | old = rcu_dereference_protected(inet->inet_opt, |
505 | sock_owned_by_user(sk)); | |
132adf54 SH |
506 | if (inet->is_icsk) { |
507 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 508 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
509 | if (sk->sk_family == PF_INET || |
510 | (!((1 << sk->sk_state) & | |
511 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 512 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 513 | #endif |
f6d8bd05 ED |
514 | if (old) |
515 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 516 | if (opt) |
f6d8bd05 | 517 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 518 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 519 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 520 | } |
132adf54 | 521 | #endif |
1da177e4 | 522 | } |
f6d8bd05 ED |
523 | rcu_assign_pointer(inet->inet_opt, opt); |
524 | if (old) | |
605b4afe | 525 | kfree_rcu(old, rcu); |
132adf54 SH |
526 | break; |
527 | } | |
528 | case IP_PKTINFO: | |
529 | if (val) | |
530 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
531 | else | |
532 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
533 | break; | |
534 | case IP_RECVTTL: | |
535 | if (val) | |
536 | inet->cmsg_flags |= IP_CMSG_TTL; | |
537 | else | |
538 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
539 | break; | |
540 | case IP_RECVTOS: | |
541 | if (val) | |
542 | inet->cmsg_flags |= IP_CMSG_TOS; | |
543 | else | |
544 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
545 | break; | |
546 | case IP_RECVOPTS: | |
547 | if (val) | |
548 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
549 | else | |
550 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
551 | break; | |
552 | case IP_RETOPTS: | |
553 | if (val) | |
554 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
555 | else | |
556 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
557 | break; | |
558 | case IP_PASSSEC: | |
559 | if (val) | |
560 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
561 | else | |
562 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
563 | break; | |
e8b2dfe9 BS |
564 | case IP_RECVORIGDSTADDR: |
565 | if (val) | |
566 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
567 | else | |
568 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
569 | break; | |
132adf54 SH |
570 | case IP_TOS: /* This sets both TOS and Precedence */ |
571 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
572 | val &= ~INET_ECN_MASK; |
573 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 574 | } |
132adf54 SH |
575 | if (inet->tos != val) { |
576 | inet->tos = val; | |
577 | sk->sk_priority = rt_tos2priority(val); | |
578 | sk_dst_reset(sk); | |
579 | } | |
580 | break; | |
581 | case IP_TTL: | |
4d52cfbe | 582 | if (optlen < 1) |
132adf54 | 583 | goto e_inval; |
4d52cfbe | 584 | if (val != -1 && (val < 0 || val > 255)) |
132adf54 SH |
585 | goto e_inval; |
586 | inet->uc_ttl = val; | |
587 | break; | |
588 | case IP_HDRINCL: | |
589 | if (sk->sk_type != SOCK_RAW) { | |
590 | err = -ENOPROTOOPT; | |
2c7946a7 | 591 | break; |
132adf54 SH |
592 | } |
593 | inet->hdrincl = val ? 1 : 0; | |
594 | break; | |
7b2ff18e JO |
595 | case IP_NODEFRAG: |
596 | if (sk->sk_type != SOCK_RAW) { | |
597 | err = -ENOPROTOOPT; | |
598 | break; | |
599 | } | |
600 | inet->nodefrag = val ? 1 : 0; | |
601 | break; | |
132adf54 | 602 | case IP_MTU_DISCOVER: |
0eae750e | 603 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
132adf54 SH |
604 | goto e_inval; |
605 | inet->pmtudisc = val; | |
606 | break; | |
607 | case IP_RECVERR: | |
608 | inet->recverr = !!val; | |
609 | if (!val) | |
610 | skb_queue_purge(&sk->sk_error_queue); | |
611 | break; | |
612 | case IP_MULTICAST_TTL: | |
613 | if (sk->sk_type == SOCK_STREAM) | |
614 | goto e_inval; | |
4d52cfbe | 615 | if (optlen < 1) |
132adf54 | 616 | goto e_inval; |
09cb105e | 617 | if (val == -1) |
132adf54 SH |
618 | val = 1; |
619 | if (val < 0 || val > 255) | |
620 | goto e_inval; | |
621 | inet->mc_ttl = val; | |
622 | break; | |
623 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 624 | if (optlen < 1) |
132adf54 SH |
625 | goto e_inval; |
626 | inet->mc_loop = !!val; | |
627 | break; | |
76e21053 EH |
628 | case IP_UNICAST_IF: |
629 | { | |
630 | struct net_device *dev = NULL; | |
631 | int ifindex; | |
632 | ||
633 | if (optlen != sizeof(int)) | |
634 | goto e_inval; | |
635 | ||
636 | ifindex = (__force int)ntohl((__force __be32)val); | |
637 | if (ifindex == 0) { | |
638 | inet->uc_index = 0; | |
639 | err = 0; | |
640 | break; | |
641 | } | |
642 | ||
643 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
644 | err = -EADDRNOTAVAIL; | |
645 | if (!dev) | |
646 | break; | |
647 | dev_put(dev); | |
648 | ||
649 | err = -EINVAL; | |
650 | if (sk->sk_bound_dev_if) | |
651 | break; | |
652 | ||
653 | inet->uc_index = ifindex; | |
654 | err = 0; | |
655 | break; | |
656 | } | |
132adf54 SH |
657 | case IP_MULTICAST_IF: |
658 | { | |
659 | struct ip_mreqn mreq; | |
660 | struct net_device *dev = NULL; | |
661 | ||
662 | if (sk->sk_type == SOCK_STREAM) | |
663 | goto e_inval; | |
664 | /* | |
665 | * Check the arguments are allowable | |
666 | */ | |
667 | ||
0915921b SW |
668 | if (optlen < sizeof(struct in_addr)) |
669 | goto e_inval; | |
670 | ||
132adf54 SH |
671 | err = -EFAULT; |
672 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 673 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 674 | break; |
132adf54 SH |
675 | } else { |
676 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
677 | if (optlen >= sizeof(struct ip_mreq)) { |
678 | if (copy_from_user(&mreq, optval, | |
679 | sizeof(struct ip_mreq))) | |
680 | break; | |
681 | } else if (optlen >= sizeof(struct in_addr)) { | |
682 | if (copy_from_user(&mreq.imr_address, optval, | |
683 | sizeof(struct in_addr))) | |
684 | break; | |
685 | } | |
132adf54 SH |
686 | } |
687 | ||
688 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 689 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
690 | inet->mc_index = 0; |
691 | inet->mc_addr = 0; | |
692 | err = 0; | |
1da177e4 LT |
693 | break; |
694 | } | |
3b1e0a65 | 695 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 696 | if (dev) |
132adf54 | 697 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 698 | } else |
55b80503 | 699 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 700 | |
1da177e4 | 701 | |
132adf54 SH |
702 | err = -EADDRNOTAVAIL; |
703 | if (!dev) | |
704 | break; | |
55b80503 | 705 | dev_put(dev); |
132adf54 SH |
706 | |
707 | err = -EINVAL; | |
708 | if (sk->sk_bound_dev_if && | |
709 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
710 | break; | |
1da177e4 | 711 | |
132adf54 SH |
712 | inet->mc_index = mreq.imr_ifindex; |
713 | inet->mc_addr = mreq.imr_address.s_addr; | |
714 | err = 0; | |
715 | break; | |
716 | } | |
1da177e4 | 717 | |
132adf54 SH |
718 | case IP_ADD_MEMBERSHIP: |
719 | case IP_DROP_MEMBERSHIP: | |
720 | { | |
721 | struct ip_mreqn mreq; | |
1da177e4 | 722 | |
a96fb49b FL |
723 | err = -EPROTO; |
724 | if (inet_sk(sk)->is_icsk) | |
725 | break; | |
726 | ||
132adf54 SH |
727 | if (optlen < sizeof(struct ip_mreq)) |
728 | goto e_inval; | |
729 | err = -EFAULT; | |
730 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 731 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 732 | break; |
132adf54 SH |
733 | } else { |
734 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 735 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 736 | break; |
132adf54 | 737 | } |
1da177e4 | 738 | |
132adf54 SH |
739 | if (optname == IP_ADD_MEMBERSHIP) |
740 | err = ip_mc_join_group(sk, &mreq); | |
741 | else | |
742 | err = ip_mc_leave_group(sk, &mreq); | |
743 | break; | |
744 | } | |
745 | case IP_MSFILTER: | |
746 | { | |
132adf54 SH |
747 | struct ip_msfilter *msf; |
748 | ||
749 | if (optlen < IP_MSFILTER_SIZE(0)) | |
750 | goto e_inval; | |
751 | if (optlen > sysctl_optmem_max) { | |
752 | err = -ENOBUFS; | |
1da177e4 LT |
753 | break; |
754 | } | |
132adf54 | 755 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 756 | if (!msf) { |
132adf54 SH |
757 | err = -ENOBUFS; |
758 | break; | |
759 | } | |
760 | err = -EFAULT; | |
761 | if (copy_from_user(msf, optval, optlen)) { | |
762 | kfree(msf); | |
763 | break; | |
764 | } | |
765 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
766 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
767 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
768 | kfree(msf); | |
769 | err = -ENOBUFS; | |
770 | break; | |
771 | } | |
772 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
773 | kfree(msf); | |
774 | err = -EINVAL; | |
775 | break; | |
776 | } | |
777 | err = ip_mc_msfilter(sk, msf, 0); | |
778 | kfree(msf); | |
779 | break; | |
780 | } | |
781 | case IP_BLOCK_SOURCE: | |
782 | case IP_UNBLOCK_SOURCE: | |
783 | case IP_ADD_SOURCE_MEMBERSHIP: | |
784 | case IP_DROP_SOURCE_MEMBERSHIP: | |
785 | { | |
786 | struct ip_mreq_source mreqs; | |
787 | int omode, add; | |
1da177e4 | 788 | |
132adf54 SH |
789 | if (optlen != sizeof(struct ip_mreq_source)) |
790 | goto e_inval; | |
791 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 792 | err = -EFAULT; |
1da177e4 LT |
793 | break; |
794 | } | |
132adf54 SH |
795 | if (optname == IP_BLOCK_SOURCE) { |
796 | omode = MCAST_EXCLUDE; | |
797 | add = 1; | |
798 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
799 | omode = MCAST_EXCLUDE; | |
800 | add = 0; | |
801 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
802 | struct ip_mreqn mreq; | |
1da177e4 | 803 | |
132adf54 SH |
804 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
805 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
806 | mreq.imr_ifindex = 0; | |
807 | err = ip_mc_join_group(sk, &mreq); | |
808 | if (err && err != -EADDRINUSE) | |
1da177e4 | 809 | break; |
132adf54 SH |
810 | omode = MCAST_INCLUDE; |
811 | add = 1; | |
812 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
813 | omode = MCAST_INCLUDE; | |
814 | add = 0; | |
815 | } | |
816 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
817 | break; | |
818 | } | |
819 | case MCAST_JOIN_GROUP: | |
820 | case MCAST_LEAVE_GROUP: | |
821 | { | |
822 | struct group_req greq; | |
823 | struct sockaddr_in *psin; | |
824 | struct ip_mreqn mreq; | |
825 | ||
826 | if (optlen < sizeof(struct group_req)) | |
827 | goto e_inval; | |
828 | err = -EFAULT; | |
829 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
830 | break; | |
831 | psin = (struct sockaddr_in *)&greq.gr_group; | |
832 | if (psin->sin_family != AF_INET) | |
833 | goto e_inval; | |
834 | memset(&mreq, 0, sizeof(mreq)); | |
835 | mreq.imr_multiaddr = psin->sin_addr; | |
836 | mreq.imr_ifindex = greq.gr_interface; | |
837 | ||
838 | if (optname == MCAST_JOIN_GROUP) | |
839 | err = ip_mc_join_group(sk, &mreq); | |
840 | else | |
841 | err = ip_mc_leave_group(sk, &mreq); | |
842 | break; | |
843 | } | |
844 | case MCAST_JOIN_SOURCE_GROUP: | |
845 | case MCAST_LEAVE_SOURCE_GROUP: | |
846 | case MCAST_BLOCK_SOURCE: | |
847 | case MCAST_UNBLOCK_SOURCE: | |
848 | { | |
849 | struct group_source_req greqs; | |
850 | struct ip_mreq_source mreqs; | |
851 | struct sockaddr_in *psin; | |
852 | int omode, add; | |
853 | ||
854 | if (optlen != sizeof(struct group_source_req)) | |
855 | goto e_inval; | |
856 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 857 | err = -EFAULT; |
1da177e4 LT |
858 | break; |
859 | } | |
132adf54 SH |
860 | if (greqs.gsr_group.ss_family != AF_INET || |
861 | greqs.gsr_source.ss_family != AF_INET) { | |
862 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
863 | break; |
864 | } | |
132adf54 SH |
865 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
866 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
867 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
868 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
869 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
870 | ||
871 | if (optname == MCAST_BLOCK_SOURCE) { | |
872 | omode = MCAST_EXCLUDE; | |
873 | add = 1; | |
874 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
875 | omode = MCAST_EXCLUDE; | |
876 | add = 0; | |
877 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
878 | struct ip_mreqn mreq; |
879 | ||
132adf54 | 880 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 881 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
882 | mreq.imr_address.s_addr = 0; |
883 | mreq.imr_ifindex = greqs.gsr_interface; | |
884 | err = ip_mc_join_group(sk, &mreq); | |
885 | if (err && err != -EADDRINUSE) | |
886 | break; | |
887 | greqs.gsr_interface = mreq.imr_ifindex; | |
888 | omode = MCAST_INCLUDE; | |
889 | add = 1; | |
890 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
891 | omode = MCAST_INCLUDE; | |
892 | add = 0; | |
893 | } | |
894 | err = ip_mc_source(add, omode, sk, &mreqs, | |
895 | greqs.gsr_interface); | |
896 | break; | |
897 | } | |
898 | case MCAST_MSFILTER: | |
899 | { | |
132adf54 SH |
900 | struct sockaddr_in *psin; |
901 | struct ip_msfilter *msf = NULL; | |
902 | struct group_filter *gsf = NULL; | |
903 | int msize, i, ifindex; | |
904 | ||
905 | if (optlen < GROUP_FILTER_SIZE(0)) | |
906 | goto e_inval; | |
907 | if (optlen > sysctl_optmem_max) { | |
908 | err = -ENOBUFS; | |
1da177e4 LT |
909 | break; |
910 | } | |
09cb105e | 911 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 912 | if (!gsf) { |
132adf54 | 913 | err = -ENOBUFS; |
1da177e4 LT |
914 | break; |
915 | } | |
132adf54 | 916 | err = -EFAULT; |
4d52cfbe | 917 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 918 | goto mc_msf_out; |
4d52cfbe | 919 | |
132adf54 SH |
920 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
921 | if (gsf->gf_numsrc >= 0x1ffffff || | |
922 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
923 | err = -ENOBUFS; | |
924 | goto mc_msf_out; | |
925 | } | |
926 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
927 | err = -EINVAL; | |
928 | goto mc_msf_out; | |
929 | } | |
930 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 931 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 932 | if (!msf) { |
132adf54 SH |
933 | err = -ENOBUFS; |
934 | goto mc_msf_out; | |
935 | } | |
936 | ifindex = gsf->gf_interface; | |
937 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
938 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 939 | err = -EADDRNOTAVAIL; |
132adf54 | 940 | goto mc_msf_out; |
1da177e4 | 941 | } |
132adf54 SH |
942 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
943 | msf->imsf_interface = 0; | |
944 | msf->imsf_fmode = gsf->gf_fmode; | |
945 | msf->imsf_numsrc = gsf->gf_numsrc; | |
946 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 947 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 948 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 949 | |
132adf54 SH |
950 | if (psin->sin_family != AF_INET) |
951 | goto mc_msf_out; | |
952 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
953 | } | |
954 | kfree(gsf); | |
955 | gsf = NULL; | |
956 | ||
957 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 958 | mc_msf_out: |
132adf54 SH |
959 | kfree(msf); |
960 | kfree(gsf); | |
961 | break; | |
962 | } | |
f771bef9 NS |
963 | case IP_MULTICAST_ALL: |
964 | if (optlen < 1) | |
965 | goto e_inval; | |
966 | if (val != 0 && val != 1) | |
967 | goto e_inval; | |
968 | inet->mc_all = val; | |
969 | break; | |
132adf54 SH |
970 | case IP_ROUTER_ALERT: |
971 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
972 | break; | |
973 | ||
974 | case IP_FREEBIND: | |
4d52cfbe | 975 | if (optlen < 1) |
132adf54 SH |
976 | goto e_inval; |
977 | inet->freebind = !!val; | |
978 | break; | |
979 | ||
980 | case IP_IPSEC_POLICY: | |
981 | case IP_XFRM_POLICY: | |
982 | err = -EPERM; | |
983 | if (!capable(CAP_NET_ADMIN)) | |
1da177e4 | 984 | break; |
132adf54 SH |
985 | err = xfrm_user_policy(sk, optname, optval, optlen); |
986 | break; | |
1da177e4 | 987 | |
f5715aea | 988 | case IP_TRANSPARENT: |
6cc7a765 | 989 | if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) { |
f5715aea KK |
990 | err = -EPERM; |
991 | break; | |
992 | } | |
993 | if (optlen < 1) | |
994 | goto e_inval; | |
995 | inet->transparent = !!val; | |
996 | break; | |
997 | ||
d218d111 SH |
998 | case IP_MINTTL: |
999 | if (optlen < 1) | |
1000 | goto e_inval; | |
1001 | if (val < 0 || val > 255) | |
1002 | goto e_inval; | |
1003 | inet->min_ttl = val; | |
1004 | break; | |
1005 | ||
132adf54 SH |
1006 | default: |
1007 | err = -ENOPROTOOPT; | |
1008 | break; | |
1da177e4 LT |
1009 | } |
1010 | release_sock(sk); | |
1011 | return err; | |
1012 | ||
1013 | e_inval: | |
1014 | release_sock(sk); | |
1015 | return -EINVAL; | |
1016 | } | |
1017 | ||
f84af32c | 1018 | /** |
d826eb14 | 1019 | * ipv4_pktinfo_prepare - transfert some info from rtable to skb |
f84af32c ED |
1020 | * @sk: socket |
1021 | * @skb: buffer | |
1022 | * | |
35ebf65e DM |
1023 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1024 | * destination in skb->cb[] before dst drop. | |
d826eb14 | 1025 | * This way, receiver doesnt make cache line misses to read rtable. |
f84af32c | 1026 | */ |
d826eb14 | 1027 | void ipv4_pktinfo_prepare(struct sk_buff *skb) |
f84af32c | 1028 | { |
d826eb14 ED |
1029 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
1030 | const struct rtable *rt = skb_rtable(skb); | |
1031 | ||
1032 | if (rt) { | |
1033 | pktinfo->ipi_ifindex = rt->rt_iif; | |
35ebf65e | 1034 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1035 | } else { |
1036 | pktinfo->ipi_ifindex = 0; | |
1037 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1038 | } | |
1039 | skb_dst_drop(skb); | |
f84af32c | 1040 | } |
f84af32c | 1041 | |
3fdadf7d | 1042 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1043 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1044 | { |
1045 | int err; | |
1046 | ||
1047 | if (level != SOL_IP) | |
1048 | return -ENOPROTOOPT; | |
1049 | ||
1050 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1051 | #ifdef CONFIG_NETFILTER | |
1052 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1053 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1054 | optname != IP_IPSEC_POLICY && |
1055 | optname != IP_XFRM_POLICY && | |
1056 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1057 | lock_sock(sk); |
1058 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1059 | release_sock(sk); | |
1060 | } | |
1061 | #endif | |
1062 | return err; | |
1063 | } | |
4d52cfbe | 1064 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1065 | |
1066 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1067 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1068 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1069 | { |
1070 | int err; | |
1071 | ||
1072 | if (level != SOL_IP) | |
1073 | return -ENOPROTOOPT; | |
1074 | ||
dae50295 DS |
1075 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1076 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1077 | ip_setsockopt); | |
1078 | ||
3fdadf7d DM |
1079 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1080 | #ifdef CONFIG_NETFILTER | |
1081 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1082 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1083 | optname != IP_IPSEC_POLICY && |
1084 | optname != IP_XFRM_POLICY && | |
1085 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1086 | lock_sock(sk); |
543d9cfe ACM |
1087 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1088 | optval, optlen); | |
3fdadf7d DM |
1089 | release_sock(sk); |
1090 | } | |
1091 | #endif | |
1092 | return err; | |
1093 | } | |
543d9cfe | 1094 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1095 | #endif |
1096 | ||
1da177e4 | 1097 | /* |
4d52cfbe ED |
1098 | * Get the options. Note for future reference. The GET of IP options gets |
1099 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1100 | */ |
1101 | ||
3fdadf7d | 1102 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1103 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1104 | { |
1105 | struct inet_sock *inet = inet_sk(sk); | |
1106 | int val; | |
1107 | int len; | |
e905a9ed | 1108 | |
132adf54 | 1109 | if (level != SOL_IP) |
1da177e4 LT |
1110 | return -EOPNOTSUPP; |
1111 | ||
6a9fb947 | 1112 | if (ip_mroute_opt(optname)) |
09cb105e | 1113 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1114 | |
09cb105e | 1115 | if (get_user(len, optlen)) |
1da177e4 | 1116 | return -EFAULT; |
132adf54 | 1117 | if (len < 0) |
1da177e4 | 1118 | return -EINVAL; |
e905a9ed | 1119 | |
1da177e4 LT |
1120 | lock_sock(sk); |
1121 | ||
132adf54 SH |
1122 | switch (optname) { |
1123 | case IP_OPTIONS: | |
1124 | { | |
1125 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1126 | struct ip_options *opt = (struct ip_options *)optbuf; |
1127 | struct ip_options_rcu *inet_opt; | |
1128 | ||
1129 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1130 | sock_owned_by_user(sk)); | |
132adf54 | 1131 | opt->optlen = 0; |
f6d8bd05 ED |
1132 | if (inet_opt) |
1133 | memcpy(optbuf, &inet_opt->opt, | |
1134 | sizeof(struct ip_options) + | |
1135 | inet_opt->opt.optlen); | |
132adf54 SH |
1136 | release_sock(sk); |
1137 | ||
1138 | if (opt->optlen == 0) | |
1139 | return put_user(0, optlen); | |
1140 | ||
1141 | ip_options_undo(opt); | |
1142 | ||
1143 | len = min_t(unsigned int, len, opt->optlen); | |
1144 | if (put_user(len, optlen)) | |
1145 | return -EFAULT; | |
1146 | if (copy_to_user(optval, opt->__data, len)) | |
1147 | return -EFAULT; | |
1148 | return 0; | |
1149 | } | |
1150 | case IP_PKTINFO: | |
1151 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1152 | break; | |
1153 | case IP_RECVTTL: | |
1154 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1155 | break; | |
1156 | case IP_RECVTOS: | |
1157 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1158 | break; | |
1159 | case IP_RECVOPTS: | |
1160 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1161 | break; | |
1162 | case IP_RETOPTS: | |
1163 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1164 | break; | |
1165 | case IP_PASSSEC: | |
1166 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1167 | break; | |
e8b2dfe9 BS |
1168 | case IP_RECVORIGDSTADDR: |
1169 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1170 | break; | |
132adf54 SH |
1171 | case IP_TOS: |
1172 | val = inet->tos; | |
1173 | break; | |
1174 | case IP_TTL: | |
1175 | val = (inet->uc_ttl == -1 ? | |
1176 | sysctl_ip_default_ttl : | |
1177 | inet->uc_ttl); | |
1178 | break; | |
1179 | case IP_HDRINCL: | |
1180 | val = inet->hdrincl; | |
1181 | break; | |
a89b4763 MK |
1182 | case IP_NODEFRAG: |
1183 | val = inet->nodefrag; | |
1184 | break; | |
132adf54 SH |
1185 | case IP_MTU_DISCOVER: |
1186 | val = inet->pmtudisc; | |
1187 | break; | |
1188 | case IP_MTU: | |
1189 | { | |
1190 | struct dst_entry *dst; | |
1191 | val = 0; | |
1192 | dst = sk_dst_get(sk); | |
1193 | if (dst) { | |
1194 | val = dst_mtu(dst); | |
1195 | dst_release(dst); | |
1da177e4 | 1196 | } |
132adf54 | 1197 | if (!val) { |
1da177e4 | 1198 | release_sock(sk); |
132adf54 | 1199 | return -ENOTCONN; |
1da177e4 | 1200 | } |
132adf54 SH |
1201 | break; |
1202 | } | |
1203 | case IP_RECVERR: | |
1204 | val = inet->recverr; | |
1205 | break; | |
1206 | case IP_MULTICAST_TTL: | |
1207 | val = inet->mc_ttl; | |
1208 | break; | |
1209 | case IP_MULTICAST_LOOP: | |
1210 | val = inet->mc_loop; | |
1211 | break; | |
76e21053 EH |
1212 | case IP_UNICAST_IF: |
1213 | val = (__force int)htonl((__u32) inet->uc_index); | |
1214 | break; | |
132adf54 SH |
1215 | case IP_MULTICAST_IF: |
1216 | { | |
1217 | struct in_addr addr; | |
1218 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1219 | addr.s_addr = inet->mc_addr; | |
1220 | release_sock(sk); | |
1da177e4 | 1221 | |
132adf54 SH |
1222 | if (put_user(len, optlen)) |
1223 | return -EFAULT; | |
1224 | if (copy_to_user(optval, &addr, len)) | |
1225 | return -EFAULT; | |
1226 | return 0; | |
1227 | } | |
1228 | case IP_MSFILTER: | |
1229 | { | |
1230 | struct ip_msfilter msf; | |
1231 | int err; | |
1232 | ||
1233 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1234 | release_sock(sk); |
132adf54 | 1235 | return -EINVAL; |
1da177e4 | 1236 | } |
132adf54 | 1237 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1238 | release_sock(sk); |
132adf54 | 1239 | return -EFAULT; |
1da177e4 | 1240 | } |
132adf54 SH |
1241 | err = ip_mc_msfget(sk, &msf, |
1242 | (struct ip_msfilter __user *)optval, optlen); | |
1243 | release_sock(sk); | |
1244 | return err; | |
1245 | } | |
1246 | case MCAST_MSFILTER: | |
1247 | { | |
1248 | struct group_filter gsf; | |
1249 | int err; | |
1da177e4 | 1250 | |
132adf54 | 1251 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1252 | release_sock(sk); |
132adf54 SH |
1253 | return -EINVAL; |
1254 | } | |
1255 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1256 | release_sock(sk); | |
1257 | return -EFAULT; | |
1258 | } | |
1259 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1260 | (struct group_filter __user *)optval, |
1261 | optlen); | |
132adf54 SH |
1262 | release_sock(sk); |
1263 | return err; | |
1264 | } | |
f771bef9 NS |
1265 | case IP_MULTICAST_ALL: |
1266 | val = inet->mc_all; | |
1267 | break; | |
132adf54 SH |
1268 | case IP_PKTOPTIONS: |
1269 | { | |
1270 | struct msghdr msg; | |
1da177e4 | 1271 | |
132adf54 | 1272 | release_sock(sk); |
1da177e4 | 1273 | |
132adf54 SH |
1274 | if (sk->sk_type != SOCK_STREAM) |
1275 | return -ENOPROTOOPT; | |
1da177e4 | 1276 | |
132adf54 SH |
1277 | msg.msg_control = optval; |
1278 | msg.msg_controllen = len; | |
dd23198e | 1279 | msg.msg_flags = flags; |
1da177e4 | 1280 | |
132adf54 SH |
1281 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1282 | struct in_pktinfo info; | |
1283 | ||
c720c7e8 ED |
1284 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1285 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1286 | info.ipi_ifindex = inet->mc_index; |
1287 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1288 | } |
132adf54 SH |
1289 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1290 | int hlim = inet->mc_ttl; | |
1291 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1292 | } | |
4c507d28 JB |
1293 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1294 | int tos = inet->rcv_tos; | |
1295 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1296 | } | |
132adf54 SH |
1297 | len -= msg.msg_controllen; |
1298 | return put_user(len, optlen); | |
1299 | } | |
1300 | case IP_FREEBIND: | |
1301 | val = inet->freebind; | |
1302 | break; | |
f5715aea KK |
1303 | case IP_TRANSPARENT: |
1304 | val = inet->transparent; | |
1305 | break; | |
d218d111 SH |
1306 | case IP_MINTTL: |
1307 | val = inet->min_ttl; | |
1308 | break; | |
132adf54 SH |
1309 | default: |
1310 | release_sock(sk); | |
1311 | return -ENOPROTOOPT; | |
1da177e4 LT |
1312 | } |
1313 | release_sock(sk); | |
e905a9ed | 1314 | |
4d52cfbe | 1315 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1316 | unsigned char ucval = (unsigned char)val; |
1317 | len = 1; | |
132adf54 | 1318 | if (put_user(len, optlen)) |
1da177e4 | 1319 | return -EFAULT; |
09cb105e | 1320 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1321 | return -EFAULT; |
1322 | } else { | |
1323 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1324 | if (put_user(len, optlen)) |
1da177e4 | 1325 | return -EFAULT; |
09cb105e | 1326 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1327 | return -EFAULT; |
1328 | } | |
1329 | return 0; | |
1330 | } | |
1331 | ||
3fdadf7d | 1332 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1333 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1334 | { |
1335 | int err; | |
1336 | ||
dd23198e | 1337 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1338 | #ifdef CONFIG_NETFILTER |
1339 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1340 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1341 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1342 | int len; |
3fdadf7d | 1343 | |
09cb105e | 1344 | if (get_user(len, optlen)) |
3fdadf7d DM |
1345 | return -EFAULT; |
1346 | ||
1347 | lock_sock(sk); | |
1348 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1349 | &len); | |
1350 | release_sock(sk); | |
1351 | if (err >= 0) | |
1352 | err = put_user(len, optlen); | |
1353 | return err; | |
1354 | } | |
1355 | #endif | |
1356 | return err; | |
1357 | } | |
4d52cfbe | 1358 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1359 | |
1360 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1361 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1362 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1363 | { |
42908c69 DS |
1364 | int err; |
1365 | ||
1366 | if (optname == MCAST_MSFILTER) | |
1367 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1368 | ip_getsockopt); | |
1369 | ||
dd23198e DB |
1370 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1371 | MSG_CMSG_COMPAT); | |
42908c69 | 1372 | |
3fdadf7d DM |
1373 | #ifdef CONFIG_NETFILTER |
1374 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1375 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1376 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1377 | int len; |
3fdadf7d | 1378 | |
543d9cfe | 1379 | if (get_user(len, optlen)) |
3fdadf7d DM |
1380 | return -EFAULT; |
1381 | ||
1382 | lock_sock(sk); | |
543d9cfe | 1383 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1384 | release_sock(sk); |
1385 | if (err >= 0) | |
1386 | err = put_user(len, optlen); | |
1387 | return err; | |
1388 | } | |
1389 | #endif | |
1390 | return err; | |
1391 | } | |
543d9cfe | 1392 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1393 | #endif |