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 | 191 | { |
f02db315 | 192 | int err, val; |
1da177e4 LT |
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 | } | |
f02db315 FF |
218 | case IP_TTL: |
219 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
220 | return -EINVAL; | |
221 | val = *(int *)CMSG_DATA(cmsg); | |
222 | if (val < 1 || val > 255) | |
223 | return -EINVAL; | |
224 | ipc->ttl = val; | |
225 | break; | |
226 | case IP_TOS: | |
227 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
228 | return -EINVAL; | |
229 | val = *(int *)CMSG_DATA(cmsg); | |
230 | if (val < 0 || val > 255) | |
231 | return -EINVAL; | |
232 | ipc->tos = val; | |
233 | ipc->priority = rt_tos2priority(ipc->tos); | |
234 | break; | |
235 | ||
1da177e4 LT |
236 | default: |
237 | return -EINVAL; | |
238 | } | |
239 | } | |
240 | return 0; | |
241 | } | |
242 | ||
243 | ||
244 | /* Special input handler for packets caught by router alert option. | |
245 | They are selected only by protocol field, and then processed likely | |
246 | local ones; but only if someone wants them! Otherwise, router | |
247 | not running rsvpd will kill RSVP. | |
248 | ||
249 | It is user level problem, what it will make with them. | |
250 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
251 | but receiver should be enough clever f.e. to forward mtrace requests, | |
252 | sent to multicast group to reach destination designated router. | |
253 | */ | |
43a951e9 | 254 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
255 | static DEFINE_SPINLOCK(ip_ra_lock); |
256 | ||
592fcb9d ED |
257 | |
258 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 259 | { |
592fcb9d ED |
260 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
261 | ||
262 | sock_put(ra->saved_sk); | |
263 | kfree(ra); | |
66018506 | 264 | } |
1da177e4 | 265 | |
4d52cfbe ED |
266 | int ip_ra_control(struct sock *sk, unsigned char on, |
267 | void (*destructor)(struct sock *)) | |
1da177e4 | 268 | { |
43a951e9 ED |
269 | struct ip_ra_chain *ra, *new_ra; |
270 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 271 | |
c720c7e8 | 272 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
273 | return -EINVAL; |
274 | ||
275 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
276 | ||
66018506 | 277 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
278 | for (rap = &ip_ra_chain; |
279 | (ra = rcu_dereference_protected(*rap, | |
280 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
281 | rap = &ra->next) { | |
1da177e4 LT |
282 | if (ra->sk == sk) { |
283 | if (on) { | |
66018506 | 284 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 285 | kfree(new_ra); |
1da177e4 LT |
286 | return -EADDRINUSE; |
287 | } | |
592fcb9d ED |
288 | /* dont let ip_call_ra_chain() use sk again */ |
289 | ra->sk = NULL; | |
66018506 ED |
290 | rcu_assign_pointer(*rap, ra->next); |
291 | spin_unlock_bh(&ip_ra_lock); | |
1da177e4 LT |
292 | |
293 | if (ra->destructor) | |
294 | ra->destructor(sk); | |
592fcb9d ED |
295 | /* |
296 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
297 | * period. This guarantee ip_call_ra_chain() dont need | |
298 | * to mess with socket refcounts. | |
299 | */ | |
300 | ra->saved_sk = sk; | |
301 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
302 | return 0; |
303 | } | |
304 | } | |
305 | if (new_ra == NULL) { | |
66018506 | 306 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
307 | return -ENOBUFS; |
308 | } | |
309 | new_ra->sk = sk; | |
310 | new_ra->destructor = destructor; | |
311 | ||
312 | new_ra->next = ra; | |
66018506 | 313 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 314 | sock_hold(sk); |
66018506 | 315 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
316 | |
317 | return 0; | |
318 | } | |
319 | ||
e905a9ed | 320 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 321 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 322 | { |
1da177e4 LT |
323 | struct sock_exterr_skb *serr; |
324 | ||
1da177e4 LT |
325 | skb = skb_clone(skb, GFP_ATOMIC); |
326 | if (!skb) | |
327 | return; | |
328 | ||
e905a9ed | 329 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
330 | serr->ee.ee_errno = err; |
331 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
332 | serr->ee.ee_type = icmp_hdr(skb)->type; |
333 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
334 | serr->ee.ee_pad = 0; |
335 | serr->ee.ee_info = info; | |
336 | serr->ee.ee_data = 0; | |
88c7664f | 337 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 338 | skb_network_header(skb); |
1da177e4 LT |
339 | serr->port = port; |
340 | ||
bd82393c ACM |
341 | if (skb_pull(skb, payload - skb->data) != NULL) { |
342 | skb_reset_transport_header(skb); | |
343 | if (sock_queue_err_skb(sk, skb) == 0) | |
344 | return; | |
345 | } | |
346 | kfree_skb(skb); | |
1da177e4 LT |
347 | } |
348 | ||
0579016e | 349 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
350 | { |
351 | struct inet_sock *inet = inet_sk(sk); | |
352 | struct sock_exterr_skb *serr; | |
353 | struct iphdr *iph; | |
354 | struct sk_buff *skb; | |
355 | ||
356 | if (!inet->recverr) | |
357 | return; | |
358 | ||
359 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
360 | if (!skb) | |
361 | return; | |
362 | ||
2ca9e6f2 ACM |
363 | skb_put(skb, sizeof(struct iphdr)); |
364 | skb_reset_network_header(skb); | |
eddc9ec5 | 365 | iph = ip_hdr(skb); |
1da177e4 LT |
366 | iph->daddr = daddr; |
367 | ||
e905a9ed | 368 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
369 | serr->ee.ee_errno = err; |
370 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 371 | serr->ee.ee_type = 0; |
1da177e4 LT |
372 | serr->ee.ee_code = 0; |
373 | serr->ee.ee_pad = 0; | |
374 | serr->ee.ee_info = info; | |
375 | serr->ee.ee_data = 0; | |
d56f90a7 | 376 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
377 | serr->port = port; |
378 | ||
27a884dc | 379 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 380 | skb_reset_transport_header(skb); |
1da177e4 LT |
381 | |
382 | if (sock_queue_err_skb(sk, skb)) | |
383 | kfree_skb(skb); | |
384 | } | |
385 | ||
e905a9ed | 386 | /* |
1da177e4 LT |
387 | * Handle MSG_ERRQUEUE |
388 | */ | |
85fbaa75 | 389 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
390 | { |
391 | struct sock_exterr_skb *serr; | |
392 | struct sk_buff *skb, *skb2; | |
342dfc30 | 393 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
394 | struct { |
395 | struct sock_extended_err ee; | |
396 | struct sockaddr_in offender; | |
397 | } errhdr; | |
398 | int err; | |
399 | int copied; | |
400 | ||
401 | err = -EAGAIN; | |
402 | skb = skb_dequeue(&sk->sk_error_queue); | |
403 | if (skb == NULL) | |
404 | goto out; | |
405 | ||
406 | copied = skb->len; | |
407 | if (copied > len) { | |
408 | msg->msg_flags |= MSG_TRUNC; | |
409 | copied = len; | |
410 | } | |
411 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
412 | if (err) | |
413 | goto out_free_skb; | |
414 | ||
415 | sock_recv_timestamp(msg, sk, skb); | |
416 | ||
417 | serr = SKB_EXT_ERR(skb); | |
418 | ||
1da177e4 LT |
419 | if (sin) { |
420 | sin->sin_family = AF_INET; | |
d56f90a7 ACM |
421 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
422 | serr->addr_offset); | |
1da177e4 LT |
423 | sin->sin_port = serr->port; |
424 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 425 | *addr_len = sizeof(*sin); |
1da177e4 LT |
426 | } |
427 | ||
428 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
429 | sin = &errhdr.offender; | |
430 | sin->sin_family = AF_UNSPEC; | |
431 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { | |
432 | struct inet_sock *inet = inet_sk(sk); | |
433 | ||
434 | sin->sin_family = AF_INET; | |
eddc9ec5 | 435 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
436 | sin->sin_port = 0; |
437 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
438 | if (inet->cmsg_flags) | |
439 | ip_cmsg_recv(msg, skb); | |
440 | } | |
441 | ||
442 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
443 | ||
444 | /* Now we could try to dump offended packet options */ | |
445 | ||
446 | msg->msg_flags |= MSG_ERRQUEUE; | |
447 | err = copied; | |
448 | ||
449 | /* Reset and regenerate socket error */ | |
e0f9f858 | 450 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 451 | sk->sk_err = 0; |
4d52cfbe ED |
452 | skb2 = skb_peek(&sk->sk_error_queue); |
453 | if (skb2 != NULL) { | |
1da177e4 | 454 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
e0f9f858 | 455 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
456 | sk->sk_error_report(sk); |
457 | } else | |
e0f9f858 | 458 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 459 | |
e905a9ed | 460 | out_free_skb: |
1da177e4 LT |
461 | kfree_skb(skb); |
462 | out: | |
463 | return err; | |
464 | } | |
465 | ||
466 | ||
467 | /* | |
4d52cfbe ED |
468 | * Socket option code for IP. This is the end of the line after any |
469 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
470 | */ |
471 | ||
3fdadf7d | 472 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 473 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
474 | { |
475 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 476 | int val = 0, err; |
1da177e4 | 477 | |
0c9f79be XW |
478 | switch (optname) { |
479 | case IP_PKTINFO: | |
480 | case IP_RECVTTL: | |
481 | case IP_RECVOPTS: | |
482 | case IP_RECVTOS: | |
483 | case IP_RETOPTS: | |
484 | case IP_TOS: | |
485 | case IP_TTL: | |
486 | case IP_HDRINCL: | |
487 | case IP_MTU_DISCOVER: | |
488 | case IP_RECVERR: | |
489 | case IP_ROUTER_ALERT: | |
490 | case IP_FREEBIND: | |
491 | case IP_PASSSEC: | |
492 | case IP_TRANSPARENT: | |
493 | case IP_MINTTL: | |
494 | case IP_NODEFRAG: | |
495 | case IP_UNICAST_IF: | |
496 | case IP_MULTICAST_TTL: | |
497 | case IP_MULTICAST_ALL: | |
498 | case IP_MULTICAST_LOOP: | |
499 | case IP_RECVORIGDSTADDR: | |
1da177e4 LT |
500 | if (optlen >= sizeof(int)) { |
501 | if (get_user(val, (int __user *) optval)) | |
502 | return -EFAULT; | |
503 | } else if (optlen >= sizeof(char)) { | |
504 | unsigned char ucval; | |
505 | ||
506 | if (get_user(ucval, (unsigned char __user *) optval)) | |
507 | return -EFAULT; | |
508 | val = (int) ucval; | |
509 | } | |
510 | } | |
511 | ||
512 | /* If optlen==0, it is equivalent to val == 0 */ | |
513 | ||
6a9fb947 | 514 | if (ip_mroute_opt(optname)) |
09cb105e | 515 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
516 | |
517 | err = 0; | |
518 | lock_sock(sk); | |
519 | ||
520 | switch (optname) { | |
132adf54 SH |
521 | case IP_OPTIONS: |
522 | { | |
f6d8bd05 ED |
523 | struct ip_options_rcu *old, *opt = NULL; |
524 | ||
65a1c4ff | 525 | if (optlen > 40) |
132adf54 | 526 | goto e_inval; |
3b1e0a65 | 527 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 528 | optval, optlen); |
132adf54 SH |
529 | if (err) |
530 | break; | |
f6d8bd05 ED |
531 | old = rcu_dereference_protected(inet->inet_opt, |
532 | sock_owned_by_user(sk)); | |
132adf54 SH |
533 | if (inet->is_icsk) { |
534 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 535 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
536 | if (sk->sk_family == PF_INET || |
537 | (!((1 << sk->sk_state) & | |
538 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 539 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 540 | #endif |
f6d8bd05 ED |
541 | if (old) |
542 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 543 | if (opt) |
f6d8bd05 | 544 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 545 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 546 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 547 | } |
132adf54 | 548 | #endif |
1da177e4 | 549 | } |
f6d8bd05 ED |
550 | rcu_assign_pointer(inet->inet_opt, opt); |
551 | if (old) | |
605b4afe | 552 | kfree_rcu(old, rcu); |
132adf54 SH |
553 | break; |
554 | } | |
555 | case IP_PKTINFO: | |
556 | if (val) | |
557 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
558 | else | |
559 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
560 | break; | |
561 | case IP_RECVTTL: | |
562 | if (val) | |
563 | inet->cmsg_flags |= IP_CMSG_TTL; | |
564 | else | |
565 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
566 | break; | |
567 | case IP_RECVTOS: | |
568 | if (val) | |
569 | inet->cmsg_flags |= IP_CMSG_TOS; | |
570 | else | |
571 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
572 | break; | |
573 | case IP_RECVOPTS: | |
574 | if (val) | |
575 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
576 | else | |
577 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
578 | break; | |
579 | case IP_RETOPTS: | |
580 | if (val) | |
581 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
582 | else | |
583 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
584 | break; | |
585 | case IP_PASSSEC: | |
586 | if (val) | |
587 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
588 | else | |
589 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
590 | break; | |
e8b2dfe9 BS |
591 | case IP_RECVORIGDSTADDR: |
592 | if (val) | |
593 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
594 | else | |
595 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
596 | break; | |
132adf54 SH |
597 | case IP_TOS: /* This sets both TOS and Precedence */ |
598 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
599 | val &= ~INET_ECN_MASK; |
600 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 601 | } |
132adf54 SH |
602 | if (inet->tos != val) { |
603 | inet->tos = val; | |
604 | sk->sk_priority = rt_tos2priority(val); | |
605 | sk_dst_reset(sk); | |
606 | } | |
607 | break; | |
608 | case IP_TTL: | |
4d52cfbe | 609 | if (optlen < 1) |
132adf54 | 610 | goto e_inval; |
c9be4a5c | 611 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
612 | goto e_inval; |
613 | inet->uc_ttl = val; | |
614 | break; | |
615 | case IP_HDRINCL: | |
616 | if (sk->sk_type != SOCK_RAW) { | |
617 | err = -ENOPROTOOPT; | |
2c7946a7 | 618 | break; |
132adf54 SH |
619 | } |
620 | inet->hdrincl = val ? 1 : 0; | |
621 | break; | |
7b2ff18e JO |
622 | case IP_NODEFRAG: |
623 | if (sk->sk_type != SOCK_RAW) { | |
624 | err = -ENOPROTOOPT; | |
625 | break; | |
626 | } | |
627 | inet->nodefrag = val ? 1 : 0; | |
628 | break; | |
132adf54 | 629 | case IP_MTU_DISCOVER: |
482fc609 | 630 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_INTERFACE) |
132adf54 SH |
631 | goto e_inval; |
632 | inet->pmtudisc = val; | |
633 | break; | |
634 | case IP_RECVERR: | |
635 | inet->recverr = !!val; | |
636 | if (!val) | |
637 | skb_queue_purge(&sk->sk_error_queue); | |
638 | break; | |
639 | case IP_MULTICAST_TTL: | |
640 | if (sk->sk_type == SOCK_STREAM) | |
641 | goto e_inval; | |
4d52cfbe | 642 | if (optlen < 1) |
132adf54 | 643 | goto e_inval; |
09cb105e | 644 | if (val == -1) |
132adf54 SH |
645 | val = 1; |
646 | if (val < 0 || val > 255) | |
647 | goto e_inval; | |
648 | inet->mc_ttl = val; | |
649 | break; | |
650 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 651 | if (optlen < 1) |
132adf54 SH |
652 | goto e_inval; |
653 | inet->mc_loop = !!val; | |
654 | break; | |
76e21053 EH |
655 | case IP_UNICAST_IF: |
656 | { | |
657 | struct net_device *dev = NULL; | |
658 | int ifindex; | |
659 | ||
660 | if (optlen != sizeof(int)) | |
661 | goto e_inval; | |
662 | ||
663 | ifindex = (__force int)ntohl((__force __be32)val); | |
664 | if (ifindex == 0) { | |
665 | inet->uc_index = 0; | |
666 | err = 0; | |
667 | break; | |
668 | } | |
669 | ||
670 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
671 | err = -EADDRNOTAVAIL; | |
672 | if (!dev) | |
673 | break; | |
674 | dev_put(dev); | |
675 | ||
676 | err = -EINVAL; | |
677 | if (sk->sk_bound_dev_if) | |
678 | break; | |
679 | ||
680 | inet->uc_index = ifindex; | |
681 | err = 0; | |
682 | break; | |
683 | } | |
132adf54 SH |
684 | case IP_MULTICAST_IF: |
685 | { | |
686 | struct ip_mreqn mreq; | |
687 | struct net_device *dev = NULL; | |
688 | ||
689 | if (sk->sk_type == SOCK_STREAM) | |
690 | goto e_inval; | |
691 | /* | |
692 | * Check the arguments are allowable | |
693 | */ | |
694 | ||
0915921b SW |
695 | if (optlen < sizeof(struct in_addr)) |
696 | goto e_inval; | |
697 | ||
132adf54 SH |
698 | err = -EFAULT; |
699 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 700 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 701 | break; |
132adf54 SH |
702 | } else { |
703 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
704 | if (optlen >= sizeof(struct ip_mreq)) { |
705 | if (copy_from_user(&mreq, optval, | |
706 | sizeof(struct ip_mreq))) | |
707 | break; | |
708 | } else if (optlen >= sizeof(struct in_addr)) { | |
709 | if (copy_from_user(&mreq.imr_address, optval, | |
710 | sizeof(struct in_addr))) | |
711 | break; | |
712 | } | |
132adf54 SH |
713 | } |
714 | ||
715 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 716 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
717 | inet->mc_index = 0; |
718 | inet->mc_addr = 0; | |
719 | err = 0; | |
1da177e4 LT |
720 | break; |
721 | } | |
3b1e0a65 | 722 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 723 | if (dev) |
132adf54 | 724 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 725 | } else |
55b80503 | 726 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 727 | |
1da177e4 | 728 | |
132adf54 SH |
729 | err = -EADDRNOTAVAIL; |
730 | if (!dev) | |
731 | break; | |
55b80503 | 732 | dev_put(dev); |
132adf54 SH |
733 | |
734 | err = -EINVAL; | |
735 | if (sk->sk_bound_dev_if && | |
736 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
737 | break; | |
1da177e4 | 738 | |
132adf54 SH |
739 | inet->mc_index = mreq.imr_ifindex; |
740 | inet->mc_addr = mreq.imr_address.s_addr; | |
741 | err = 0; | |
742 | break; | |
743 | } | |
1da177e4 | 744 | |
132adf54 SH |
745 | case IP_ADD_MEMBERSHIP: |
746 | case IP_DROP_MEMBERSHIP: | |
747 | { | |
748 | struct ip_mreqn mreq; | |
1da177e4 | 749 | |
a96fb49b FL |
750 | err = -EPROTO; |
751 | if (inet_sk(sk)->is_icsk) | |
752 | break; | |
753 | ||
132adf54 SH |
754 | if (optlen < sizeof(struct ip_mreq)) |
755 | goto e_inval; | |
756 | err = -EFAULT; | |
757 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 758 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 759 | break; |
132adf54 SH |
760 | } else { |
761 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 762 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 763 | break; |
132adf54 | 764 | } |
1da177e4 | 765 | |
132adf54 SH |
766 | if (optname == IP_ADD_MEMBERSHIP) |
767 | err = ip_mc_join_group(sk, &mreq); | |
768 | else | |
769 | err = ip_mc_leave_group(sk, &mreq); | |
770 | break; | |
771 | } | |
772 | case IP_MSFILTER: | |
773 | { | |
132adf54 SH |
774 | struct ip_msfilter *msf; |
775 | ||
776 | if (optlen < IP_MSFILTER_SIZE(0)) | |
777 | goto e_inval; | |
778 | if (optlen > sysctl_optmem_max) { | |
779 | err = -ENOBUFS; | |
1da177e4 LT |
780 | break; |
781 | } | |
132adf54 | 782 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 783 | if (!msf) { |
132adf54 SH |
784 | err = -ENOBUFS; |
785 | break; | |
786 | } | |
787 | err = -EFAULT; | |
788 | if (copy_from_user(msf, optval, optlen)) { | |
789 | kfree(msf); | |
790 | break; | |
791 | } | |
792 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
793 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
794 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
795 | kfree(msf); | |
796 | err = -ENOBUFS; | |
797 | break; | |
798 | } | |
799 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
800 | kfree(msf); | |
801 | err = -EINVAL; | |
802 | break; | |
803 | } | |
804 | err = ip_mc_msfilter(sk, msf, 0); | |
805 | kfree(msf); | |
806 | break; | |
807 | } | |
808 | case IP_BLOCK_SOURCE: | |
809 | case IP_UNBLOCK_SOURCE: | |
810 | case IP_ADD_SOURCE_MEMBERSHIP: | |
811 | case IP_DROP_SOURCE_MEMBERSHIP: | |
812 | { | |
813 | struct ip_mreq_source mreqs; | |
814 | int omode, add; | |
1da177e4 | 815 | |
132adf54 SH |
816 | if (optlen != sizeof(struct ip_mreq_source)) |
817 | goto e_inval; | |
818 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 819 | err = -EFAULT; |
1da177e4 LT |
820 | break; |
821 | } | |
132adf54 SH |
822 | if (optname == IP_BLOCK_SOURCE) { |
823 | omode = MCAST_EXCLUDE; | |
824 | add = 1; | |
825 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
826 | omode = MCAST_EXCLUDE; | |
827 | add = 0; | |
828 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
829 | struct ip_mreqn mreq; | |
1da177e4 | 830 | |
132adf54 SH |
831 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
832 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
833 | mreq.imr_ifindex = 0; | |
834 | err = ip_mc_join_group(sk, &mreq); | |
835 | if (err && err != -EADDRINUSE) | |
1da177e4 | 836 | break; |
132adf54 SH |
837 | omode = MCAST_INCLUDE; |
838 | add = 1; | |
839 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
840 | omode = MCAST_INCLUDE; | |
841 | add = 0; | |
842 | } | |
843 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
844 | break; | |
845 | } | |
846 | case MCAST_JOIN_GROUP: | |
847 | case MCAST_LEAVE_GROUP: | |
848 | { | |
849 | struct group_req greq; | |
850 | struct sockaddr_in *psin; | |
851 | struct ip_mreqn mreq; | |
852 | ||
853 | if (optlen < sizeof(struct group_req)) | |
854 | goto e_inval; | |
855 | err = -EFAULT; | |
856 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
857 | break; | |
858 | psin = (struct sockaddr_in *)&greq.gr_group; | |
859 | if (psin->sin_family != AF_INET) | |
860 | goto e_inval; | |
861 | memset(&mreq, 0, sizeof(mreq)); | |
862 | mreq.imr_multiaddr = psin->sin_addr; | |
863 | mreq.imr_ifindex = greq.gr_interface; | |
864 | ||
865 | if (optname == MCAST_JOIN_GROUP) | |
866 | err = ip_mc_join_group(sk, &mreq); | |
867 | else | |
868 | err = ip_mc_leave_group(sk, &mreq); | |
869 | break; | |
870 | } | |
871 | case MCAST_JOIN_SOURCE_GROUP: | |
872 | case MCAST_LEAVE_SOURCE_GROUP: | |
873 | case MCAST_BLOCK_SOURCE: | |
874 | case MCAST_UNBLOCK_SOURCE: | |
875 | { | |
876 | struct group_source_req greqs; | |
877 | struct ip_mreq_source mreqs; | |
878 | struct sockaddr_in *psin; | |
879 | int omode, add; | |
880 | ||
881 | if (optlen != sizeof(struct group_source_req)) | |
882 | goto e_inval; | |
883 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 884 | err = -EFAULT; |
1da177e4 LT |
885 | break; |
886 | } | |
132adf54 SH |
887 | if (greqs.gsr_group.ss_family != AF_INET || |
888 | greqs.gsr_source.ss_family != AF_INET) { | |
889 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
890 | break; |
891 | } | |
132adf54 SH |
892 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
893 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
894 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
895 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
896 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
897 | ||
898 | if (optname == MCAST_BLOCK_SOURCE) { | |
899 | omode = MCAST_EXCLUDE; | |
900 | add = 1; | |
901 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
902 | omode = MCAST_EXCLUDE; | |
903 | add = 0; | |
904 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
905 | struct ip_mreqn mreq; |
906 | ||
132adf54 | 907 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 908 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
909 | mreq.imr_address.s_addr = 0; |
910 | mreq.imr_ifindex = greqs.gsr_interface; | |
911 | err = ip_mc_join_group(sk, &mreq); | |
912 | if (err && err != -EADDRINUSE) | |
913 | break; | |
914 | greqs.gsr_interface = mreq.imr_ifindex; | |
915 | omode = MCAST_INCLUDE; | |
916 | add = 1; | |
917 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
918 | omode = MCAST_INCLUDE; | |
919 | add = 0; | |
920 | } | |
921 | err = ip_mc_source(add, omode, sk, &mreqs, | |
922 | greqs.gsr_interface); | |
923 | break; | |
924 | } | |
925 | case MCAST_MSFILTER: | |
926 | { | |
132adf54 SH |
927 | struct sockaddr_in *psin; |
928 | struct ip_msfilter *msf = NULL; | |
929 | struct group_filter *gsf = NULL; | |
930 | int msize, i, ifindex; | |
931 | ||
932 | if (optlen < GROUP_FILTER_SIZE(0)) | |
933 | goto e_inval; | |
934 | if (optlen > sysctl_optmem_max) { | |
935 | err = -ENOBUFS; | |
1da177e4 LT |
936 | break; |
937 | } | |
09cb105e | 938 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 939 | if (!gsf) { |
132adf54 | 940 | err = -ENOBUFS; |
1da177e4 LT |
941 | break; |
942 | } | |
132adf54 | 943 | err = -EFAULT; |
4d52cfbe | 944 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 945 | goto mc_msf_out; |
4d52cfbe | 946 | |
132adf54 SH |
947 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
948 | if (gsf->gf_numsrc >= 0x1ffffff || | |
949 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
950 | err = -ENOBUFS; | |
951 | goto mc_msf_out; | |
952 | } | |
953 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
954 | err = -EINVAL; | |
955 | goto mc_msf_out; | |
956 | } | |
957 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 958 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 959 | if (!msf) { |
132adf54 SH |
960 | err = -ENOBUFS; |
961 | goto mc_msf_out; | |
962 | } | |
963 | ifindex = gsf->gf_interface; | |
964 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
965 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 966 | err = -EADDRNOTAVAIL; |
132adf54 | 967 | goto mc_msf_out; |
1da177e4 | 968 | } |
132adf54 SH |
969 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
970 | msf->imsf_interface = 0; | |
971 | msf->imsf_fmode = gsf->gf_fmode; | |
972 | msf->imsf_numsrc = gsf->gf_numsrc; | |
973 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 974 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 975 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 976 | |
132adf54 SH |
977 | if (psin->sin_family != AF_INET) |
978 | goto mc_msf_out; | |
979 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
980 | } | |
981 | kfree(gsf); | |
982 | gsf = NULL; | |
983 | ||
984 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 985 | mc_msf_out: |
132adf54 SH |
986 | kfree(msf); |
987 | kfree(gsf); | |
988 | break; | |
989 | } | |
f771bef9 NS |
990 | case IP_MULTICAST_ALL: |
991 | if (optlen < 1) | |
992 | goto e_inval; | |
993 | if (val != 0 && val != 1) | |
994 | goto e_inval; | |
995 | inet->mc_all = val; | |
996 | break; | |
132adf54 SH |
997 | case IP_ROUTER_ALERT: |
998 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
999 | break; | |
1000 | ||
1001 | case IP_FREEBIND: | |
4d52cfbe | 1002 | if (optlen < 1) |
132adf54 SH |
1003 | goto e_inval; |
1004 | inet->freebind = !!val; | |
1005 | break; | |
1006 | ||
1007 | case IP_IPSEC_POLICY: | |
1008 | case IP_XFRM_POLICY: | |
1009 | err = -EPERM; | |
52e804c6 | 1010 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1011 | break; |
132adf54 SH |
1012 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1013 | break; | |
1da177e4 | 1014 | |
f5715aea | 1015 | case IP_TRANSPARENT: |
52e804c6 EB |
1016 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1017 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1018 | err = -EPERM; |
1019 | break; | |
1020 | } | |
1021 | if (optlen < 1) | |
1022 | goto e_inval; | |
1023 | inet->transparent = !!val; | |
1024 | break; | |
1025 | ||
d218d111 SH |
1026 | case IP_MINTTL: |
1027 | if (optlen < 1) | |
1028 | goto e_inval; | |
1029 | if (val < 0 || val > 255) | |
1030 | goto e_inval; | |
1031 | inet->min_ttl = val; | |
1032 | break; | |
1033 | ||
132adf54 SH |
1034 | default: |
1035 | err = -ENOPROTOOPT; | |
1036 | break; | |
1da177e4 LT |
1037 | } |
1038 | release_sock(sk); | |
1039 | return err; | |
1040 | ||
1041 | e_inval: | |
1042 | release_sock(sk); | |
1043 | return -EINVAL; | |
1044 | } | |
1045 | ||
f84af32c | 1046 | /** |
d826eb14 | 1047 | * ipv4_pktinfo_prepare - transfert some info from rtable to skb |
f84af32c ED |
1048 | * @sk: socket |
1049 | * @skb: buffer | |
1050 | * | |
35ebf65e DM |
1051 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1052 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1053 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1054 | */ |
fbf8866d | 1055 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1056 | { |
d826eb14 | 1057 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
d826eb14 | 1058 | |
fbf8866d SB |
1059 | if ((inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) && |
1060 | skb_rtable(skb)) { | |
92101b3b | 1061 | pktinfo->ipi_ifindex = inet_iif(skb); |
35ebf65e | 1062 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1063 | } else { |
1064 | pktinfo->ipi_ifindex = 0; | |
1065 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1066 | } | |
1067 | skb_dst_drop(skb); | |
f84af32c | 1068 | } |
f84af32c | 1069 | |
3fdadf7d | 1070 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1071 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1072 | { |
1073 | int err; | |
1074 | ||
1075 | if (level != SOL_IP) | |
1076 | return -ENOPROTOOPT; | |
1077 | ||
1078 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1079 | #ifdef CONFIG_NETFILTER | |
1080 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1081 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1082 | optname != IP_IPSEC_POLICY && |
1083 | optname != IP_XFRM_POLICY && | |
1084 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1085 | lock_sock(sk); |
1086 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1087 | release_sock(sk); | |
1088 | } | |
1089 | #endif | |
1090 | return err; | |
1091 | } | |
4d52cfbe | 1092 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1093 | |
1094 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1095 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1096 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1097 | { |
1098 | int err; | |
1099 | ||
1100 | if (level != SOL_IP) | |
1101 | return -ENOPROTOOPT; | |
1102 | ||
dae50295 DS |
1103 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1104 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1105 | ip_setsockopt); | |
1106 | ||
3fdadf7d DM |
1107 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1108 | #ifdef CONFIG_NETFILTER | |
1109 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1110 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1111 | optname != IP_IPSEC_POLICY && |
1112 | optname != IP_XFRM_POLICY && | |
1113 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1114 | lock_sock(sk); |
543d9cfe ACM |
1115 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1116 | optval, optlen); | |
3fdadf7d DM |
1117 | release_sock(sk); |
1118 | } | |
1119 | #endif | |
1120 | return err; | |
1121 | } | |
543d9cfe | 1122 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1123 | #endif |
1124 | ||
1da177e4 | 1125 | /* |
4d52cfbe ED |
1126 | * Get the options. Note for future reference. The GET of IP options gets |
1127 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1128 | */ |
1129 | ||
3fdadf7d | 1130 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1131 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1132 | { |
1133 | struct inet_sock *inet = inet_sk(sk); | |
1134 | int val; | |
1135 | int len; | |
e905a9ed | 1136 | |
132adf54 | 1137 | if (level != SOL_IP) |
1da177e4 LT |
1138 | return -EOPNOTSUPP; |
1139 | ||
6a9fb947 | 1140 | if (ip_mroute_opt(optname)) |
09cb105e | 1141 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1142 | |
09cb105e | 1143 | if (get_user(len, optlen)) |
1da177e4 | 1144 | return -EFAULT; |
132adf54 | 1145 | if (len < 0) |
1da177e4 | 1146 | return -EINVAL; |
e905a9ed | 1147 | |
1da177e4 LT |
1148 | lock_sock(sk); |
1149 | ||
132adf54 SH |
1150 | switch (optname) { |
1151 | case IP_OPTIONS: | |
1152 | { | |
1153 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1154 | struct ip_options *opt = (struct ip_options *)optbuf; |
1155 | struct ip_options_rcu *inet_opt; | |
1156 | ||
1157 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1158 | sock_owned_by_user(sk)); | |
132adf54 | 1159 | opt->optlen = 0; |
f6d8bd05 ED |
1160 | if (inet_opt) |
1161 | memcpy(optbuf, &inet_opt->opt, | |
1162 | sizeof(struct ip_options) + | |
1163 | inet_opt->opt.optlen); | |
132adf54 SH |
1164 | release_sock(sk); |
1165 | ||
1166 | if (opt->optlen == 0) | |
1167 | return put_user(0, optlen); | |
1168 | ||
1169 | ip_options_undo(opt); | |
1170 | ||
1171 | len = min_t(unsigned int, len, opt->optlen); | |
1172 | if (put_user(len, optlen)) | |
1173 | return -EFAULT; | |
1174 | if (copy_to_user(optval, opt->__data, len)) | |
1175 | return -EFAULT; | |
1176 | return 0; | |
1177 | } | |
1178 | case IP_PKTINFO: | |
1179 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1180 | break; | |
1181 | case IP_RECVTTL: | |
1182 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1183 | break; | |
1184 | case IP_RECVTOS: | |
1185 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1186 | break; | |
1187 | case IP_RECVOPTS: | |
1188 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1189 | break; | |
1190 | case IP_RETOPTS: | |
1191 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1192 | break; | |
1193 | case IP_PASSSEC: | |
1194 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1195 | break; | |
e8b2dfe9 BS |
1196 | case IP_RECVORIGDSTADDR: |
1197 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1198 | break; | |
132adf54 SH |
1199 | case IP_TOS: |
1200 | val = inet->tos; | |
1201 | break; | |
1202 | case IP_TTL: | |
1203 | val = (inet->uc_ttl == -1 ? | |
1204 | sysctl_ip_default_ttl : | |
1205 | inet->uc_ttl); | |
1206 | break; | |
1207 | case IP_HDRINCL: | |
1208 | val = inet->hdrincl; | |
1209 | break; | |
a89b4763 MK |
1210 | case IP_NODEFRAG: |
1211 | val = inet->nodefrag; | |
1212 | break; | |
132adf54 SH |
1213 | case IP_MTU_DISCOVER: |
1214 | val = inet->pmtudisc; | |
1215 | break; | |
1216 | case IP_MTU: | |
1217 | { | |
1218 | struct dst_entry *dst; | |
1219 | val = 0; | |
1220 | dst = sk_dst_get(sk); | |
1221 | if (dst) { | |
1222 | val = dst_mtu(dst); | |
1223 | dst_release(dst); | |
1da177e4 | 1224 | } |
132adf54 | 1225 | if (!val) { |
1da177e4 | 1226 | release_sock(sk); |
132adf54 | 1227 | return -ENOTCONN; |
1da177e4 | 1228 | } |
132adf54 SH |
1229 | break; |
1230 | } | |
1231 | case IP_RECVERR: | |
1232 | val = inet->recverr; | |
1233 | break; | |
1234 | case IP_MULTICAST_TTL: | |
1235 | val = inet->mc_ttl; | |
1236 | break; | |
1237 | case IP_MULTICAST_LOOP: | |
1238 | val = inet->mc_loop; | |
1239 | break; | |
76e21053 EH |
1240 | case IP_UNICAST_IF: |
1241 | val = (__force int)htonl((__u32) inet->uc_index); | |
1242 | break; | |
132adf54 SH |
1243 | case IP_MULTICAST_IF: |
1244 | { | |
1245 | struct in_addr addr; | |
1246 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1247 | addr.s_addr = inet->mc_addr; | |
1248 | release_sock(sk); | |
1da177e4 | 1249 | |
132adf54 SH |
1250 | if (put_user(len, optlen)) |
1251 | return -EFAULT; | |
1252 | if (copy_to_user(optval, &addr, len)) | |
1253 | return -EFAULT; | |
1254 | return 0; | |
1255 | } | |
1256 | case IP_MSFILTER: | |
1257 | { | |
1258 | struct ip_msfilter msf; | |
1259 | int err; | |
1260 | ||
1261 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1262 | release_sock(sk); |
132adf54 | 1263 | return -EINVAL; |
1da177e4 | 1264 | } |
132adf54 | 1265 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1266 | release_sock(sk); |
132adf54 | 1267 | return -EFAULT; |
1da177e4 | 1268 | } |
132adf54 SH |
1269 | err = ip_mc_msfget(sk, &msf, |
1270 | (struct ip_msfilter __user *)optval, optlen); | |
1271 | release_sock(sk); | |
1272 | return err; | |
1273 | } | |
1274 | case MCAST_MSFILTER: | |
1275 | { | |
1276 | struct group_filter gsf; | |
1277 | int err; | |
1da177e4 | 1278 | |
132adf54 | 1279 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1280 | release_sock(sk); |
132adf54 SH |
1281 | return -EINVAL; |
1282 | } | |
1283 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1284 | release_sock(sk); | |
1285 | return -EFAULT; | |
1286 | } | |
1287 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1288 | (struct group_filter __user *)optval, |
1289 | optlen); | |
132adf54 SH |
1290 | release_sock(sk); |
1291 | return err; | |
1292 | } | |
f771bef9 NS |
1293 | case IP_MULTICAST_ALL: |
1294 | val = inet->mc_all; | |
1295 | break; | |
132adf54 SH |
1296 | case IP_PKTOPTIONS: |
1297 | { | |
1298 | struct msghdr msg; | |
1da177e4 | 1299 | |
132adf54 | 1300 | release_sock(sk); |
1da177e4 | 1301 | |
132adf54 SH |
1302 | if (sk->sk_type != SOCK_STREAM) |
1303 | return -ENOPROTOOPT; | |
1da177e4 | 1304 | |
132adf54 SH |
1305 | msg.msg_control = optval; |
1306 | msg.msg_controllen = len; | |
dd23198e | 1307 | msg.msg_flags = flags; |
1da177e4 | 1308 | |
132adf54 SH |
1309 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1310 | struct in_pktinfo info; | |
1311 | ||
c720c7e8 ED |
1312 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1313 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1314 | info.ipi_ifindex = inet->mc_index; |
1315 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1316 | } |
132adf54 SH |
1317 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1318 | int hlim = inet->mc_ttl; | |
1319 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1320 | } | |
4c507d28 JB |
1321 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1322 | int tos = inet->rcv_tos; | |
1323 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1324 | } | |
132adf54 SH |
1325 | len -= msg.msg_controllen; |
1326 | return put_user(len, optlen); | |
1327 | } | |
1328 | case IP_FREEBIND: | |
1329 | val = inet->freebind; | |
1330 | break; | |
f5715aea KK |
1331 | case IP_TRANSPARENT: |
1332 | val = inet->transparent; | |
1333 | break; | |
d218d111 SH |
1334 | case IP_MINTTL: |
1335 | val = inet->min_ttl; | |
1336 | break; | |
132adf54 SH |
1337 | default: |
1338 | release_sock(sk); | |
1339 | return -ENOPROTOOPT; | |
1da177e4 LT |
1340 | } |
1341 | release_sock(sk); | |
e905a9ed | 1342 | |
4d52cfbe | 1343 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1344 | unsigned char ucval = (unsigned char)val; |
1345 | len = 1; | |
132adf54 | 1346 | if (put_user(len, optlen)) |
1da177e4 | 1347 | return -EFAULT; |
09cb105e | 1348 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1349 | return -EFAULT; |
1350 | } else { | |
1351 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1352 | if (put_user(len, optlen)) |
1da177e4 | 1353 | return -EFAULT; |
09cb105e | 1354 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1355 | return -EFAULT; |
1356 | } | |
1357 | return 0; | |
1358 | } | |
1359 | ||
3fdadf7d | 1360 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1361 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1362 | { |
1363 | int err; | |
1364 | ||
dd23198e | 1365 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1366 | #ifdef CONFIG_NETFILTER |
1367 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1368 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1369 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1370 | int len; |
3fdadf7d | 1371 | |
09cb105e | 1372 | if (get_user(len, optlen)) |
3fdadf7d DM |
1373 | return -EFAULT; |
1374 | ||
1375 | lock_sock(sk); | |
1376 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1377 | &len); | |
1378 | release_sock(sk); | |
1379 | if (err >= 0) | |
1380 | err = put_user(len, optlen); | |
1381 | return err; | |
1382 | } | |
1383 | #endif | |
1384 | return err; | |
1385 | } | |
4d52cfbe | 1386 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1387 | |
1388 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1389 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1390 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1391 | { |
42908c69 DS |
1392 | int err; |
1393 | ||
1394 | if (optname == MCAST_MSFILTER) | |
1395 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1396 | ip_getsockopt); | |
1397 | ||
dd23198e DB |
1398 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1399 | MSG_CMSG_COMPAT); | |
42908c69 | 1400 | |
3fdadf7d DM |
1401 | #ifdef CONFIG_NETFILTER |
1402 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1403 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1404 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1405 | int len; |
3fdadf7d | 1406 | |
543d9cfe | 1407 | if (get_user(len, optlen)) |
3fdadf7d DM |
1408 | return -EFAULT; |
1409 | ||
1410 | lock_sock(sk); | |
543d9cfe | 1411 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1412 | release_sock(sk); |
1413 | if (err >= 0) | |
1414 | err = put_user(len, optlen); | |
1415 | return err; | |
1416 | } | |
1417 | #endif | |
1418 | return err; | |
1419 | } | |
543d9cfe | 1420 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1421 | #endif |