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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The IP to API glue. | |
e905a9ed | 7 | * |
1da177e4 LT |
8 | * Authors: see ip.c |
9 | * | |
10 | * Fixes: | |
11 | * Many : Split from ip.c , see ip.c for history. | |
12 | * Martin Mares : TOS setting fixed. | |
e905a9ed | 13 | * Alan Cox : Fixed a couple of oopses in Martin's |
1da177e4 LT |
14 | * TOS tweaks. |
15 | * Mike McLagan : Routing by source | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/mm.h> | |
1da177e4 LT |
21 | #include <linux/skbuff.h> |
22 | #include <linux/ip.h> | |
23 | #include <linux/icmp.h> | |
14c85021 | 24 | #include <linux/inetdevice.h> |
1da177e4 | 25 | #include <linux/netdevice.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 LT |
27 | #include <net/sock.h> |
28 | #include <net/ip.h> | |
29 | #include <net/icmp.h> | |
d83d8461 | 30 | #include <net/tcp_states.h> |
1da177e4 LT |
31 | #include <linux/udp.h> |
32 | #include <linux/igmp.h> | |
33 | #include <linux/netfilter.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/mroute.h> | |
2c67e9ac | 36 | #include <net/inet_ecn.h> |
1da177e4 LT |
37 | #include <net/route.h> |
38 | #include <net/xfrm.h> | |
dae50295 | 39 | #include <net/compat.h> |
dfd56b8b | 40 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
41 | #include <net/transp_v6.h> |
42 | #endif | |
35ebf65e | 43 | #include <net/ip_fib.h> |
1da177e4 LT |
44 | |
45 | #include <linux/errqueue.h> | |
46 | #include <asm/uaccess.h> | |
47 | ||
48 | #define IP_CMSG_PKTINFO 1 | |
49 | #define IP_CMSG_TTL 2 | |
50 | #define IP_CMSG_TOS 4 | |
51 | #define IP_CMSG_RECVOPTS 8 | |
52 | #define IP_CMSG_RETOPTS 16 | |
2c7946a7 | 53 | #define IP_CMSG_PASSSEC 32 |
e8b2dfe9 | 54 | #define IP_CMSG_ORIGDSTADDR 64 |
1da177e4 LT |
55 | |
56 | /* | |
57 | * SOL_IP control messages. | |
58 | */ | |
59 | ||
60 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
61 | { | |
d826eb14 | 62 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 63 | |
eddc9ec5 | 64 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
65 | |
66 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
67 | } | |
68 | ||
69 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
70 | { | |
eddc9ec5 | 71 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
72 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
73 | } | |
74 | ||
75 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
76 | { | |
eddc9ec5 | 77 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
78 | } |
79 | ||
80 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
81 | { | |
82 | if (IPCB(skb)->opt.optlen == 0) | |
83 | return; | |
84 | ||
eddc9ec5 ACM |
85 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
86 | ip_hdr(skb) + 1); | |
1da177e4 LT |
87 | } |
88 | ||
89 | ||
90 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
91 | { | |
92 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 93 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
94 | |
95 | if (IPCB(skb)->opt.optlen == 0) | |
96 | return; | |
97 | ||
98 | if (ip_options_echo(opt, skb)) { | |
99 | msg->msg_flags |= MSG_CTRUNC; | |
100 | return; | |
101 | } | |
102 | ip_options_undo(opt); | |
103 | ||
104 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
105 | } | |
106 | ||
2c7946a7 CZ |
107 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
108 | { | |
109 | char *secdata; | |
dc49c1f9 | 110 | u32 seclen, secid; |
2c7946a7 CZ |
111 | int err; |
112 | ||
dc49c1f9 CZ |
113 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
114 | if (err) | |
115 | return; | |
116 | ||
117 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
118 | if (err) |
119 | return; | |
120 | ||
121 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 122 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
123 | } |
124 | ||
21d1a161 | 125 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
126 | { |
127 | struct sockaddr_in sin; | |
b71d1d42 | 128 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 129 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
130 | |
131 | if (skb_transport_offset(skb) + 4 > skb->len) | |
132 | return; | |
133 | ||
134 | /* All current transport protocols have the port numbers in the | |
135 | * first four bytes of the transport header and this function is | |
136 | * written with this assumption in mind. | |
137 | */ | |
138 | ||
139 | sin.sin_family = AF_INET; | |
140 | sin.sin_addr.s_addr = iph->daddr; | |
141 | sin.sin_port = ports[1]; | |
142 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
143 | ||
144 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
145 | } | |
1da177e4 LT |
146 | |
147 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) | |
148 | { | |
149 | struct inet_sock *inet = inet_sk(skb->sk); | |
95c96174 | 150 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
151 | |
152 | /* Ordered by supposed usage frequency */ | |
153 | if (flags & 1) | |
154 | ip_cmsg_recv_pktinfo(msg, skb); | |
4d52cfbe | 155 | if ((flags >>= 1) == 0) |
1da177e4 LT |
156 | return; |
157 | ||
158 | if (flags & 1) | |
159 | ip_cmsg_recv_ttl(msg, skb); | |
4d52cfbe | 160 | if ((flags >>= 1) == 0) |
1da177e4 LT |
161 | return; |
162 | ||
163 | if (flags & 1) | |
164 | ip_cmsg_recv_tos(msg, skb); | |
4d52cfbe | 165 | if ((flags >>= 1) == 0) |
1da177e4 LT |
166 | return; |
167 | ||
168 | if (flags & 1) | |
169 | ip_cmsg_recv_opts(msg, skb); | |
4d52cfbe | 170 | if ((flags >>= 1) == 0) |
1da177e4 LT |
171 | return; |
172 | ||
173 | if (flags & 1) | |
174 | ip_cmsg_recv_retopts(msg, skb); | |
4d52cfbe | 175 | if ((flags >>= 1) == 0) |
2c7946a7 CZ |
176 | return; |
177 | ||
178 | if (flags & 1) | |
179 | ip_cmsg_recv_security(msg, skb); | |
e8b2dfe9 | 180 | |
4d52cfbe | 181 | if ((flags >>= 1) == 0) |
e8b2dfe9 BS |
182 | return; |
183 | if (flags & 1) | |
184 | ip_cmsg_recv_dstaddr(msg, skb); | |
185 | ||
1da177e4 | 186 | } |
4d52cfbe | 187 | EXPORT_SYMBOL(ip_cmsg_recv); |
1da177e4 | 188 | |
c8e6ad08 HFS |
189 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, |
190 | bool allow_ipv6) | |
1da177e4 | 191 | { |
f02db315 | 192 | int err, val; |
1da177e4 LT |
193 | struct cmsghdr *cmsg; |
194 | ||
f95b414e | 195 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
196 | if (!CMSG_OK(msg, cmsg)) |
197 | return -EINVAL; | |
5337b5b7 | 198 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
199 | if (allow_ipv6 && |
200 | cmsg->cmsg_level == SOL_IPV6 && | |
201 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
202 | struct in6_pktinfo *src_info; | |
203 | ||
204 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
205 | return -EINVAL; | |
206 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
207 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
208 | return -EINVAL; | |
209 | ipc->oif = src_info->ipi6_ifindex; | |
210 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; | |
211 | continue; | |
212 | } | |
213 | #endif | |
1da177e4 LT |
214 | if (cmsg->cmsg_level != SOL_IP) |
215 | continue; | |
216 | switch (cmsg->cmsg_type) { | |
217 | case IP_RETOPTS: | |
218 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4d52cfbe ED |
219 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
220 | err < 40 ? err : 40); | |
1da177e4 LT |
221 | if (err) |
222 | return err; | |
223 | break; | |
224 | case IP_PKTINFO: | |
225 | { | |
226 | struct in_pktinfo *info; | |
227 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
228 | return -EINVAL; | |
229 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
230 | ipc->oif = info->ipi_ifindex; | |
231 | ipc->addr = info->ipi_spec_dst.s_addr; | |
232 | break; | |
233 | } | |
f02db315 FF |
234 | case IP_TTL: |
235 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
236 | return -EINVAL; | |
237 | val = *(int *)CMSG_DATA(cmsg); | |
238 | if (val < 1 || val > 255) | |
239 | return -EINVAL; | |
240 | ipc->ttl = val; | |
241 | break; | |
242 | case IP_TOS: | |
243 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
244 | return -EINVAL; | |
245 | val = *(int *)CMSG_DATA(cmsg); | |
246 | if (val < 0 || val > 255) | |
247 | return -EINVAL; | |
248 | ipc->tos = val; | |
249 | ipc->priority = rt_tos2priority(ipc->tos); | |
250 | break; | |
251 | ||
1da177e4 LT |
252 | default: |
253 | return -EINVAL; | |
254 | } | |
255 | } | |
256 | return 0; | |
257 | } | |
258 | ||
259 | ||
260 | /* Special input handler for packets caught by router alert option. | |
261 | They are selected only by protocol field, and then processed likely | |
262 | local ones; but only if someone wants them! Otherwise, router | |
263 | not running rsvpd will kill RSVP. | |
264 | ||
265 | It is user level problem, what it will make with them. | |
266 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
267 | but receiver should be enough clever f.e. to forward mtrace requests, | |
268 | sent to multicast group to reach destination designated router. | |
269 | */ | |
43a951e9 | 270 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
271 | static DEFINE_SPINLOCK(ip_ra_lock); |
272 | ||
592fcb9d ED |
273 | |
274 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 275 | { |
592fcb9d ED |
276 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
277 | ||
278 | sock_put(ra->saved_sk); | |
279 | kfree(ra); | |
66018506 | 280 | } |
1da177e4 | 281 | |
4d52cfbe ED |
282 | int ip_ra_control(struct sock *sk, unsigned char on, |
283 | void (*destructor)(struct sock *)) | |
1da177e4 | 284 | { |
43a951e9 ED |
285 | struct ip_ra_chain *ra, *new_ra; |
286 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 287 | |
c720c7e8 | 288 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
289 | return -EINVAL; |
290 | ||
291 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
292 | ||
66018506 | 293 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
294 | for (rap = &ip_ra_chain; |
295 | (ra = rcu_dereference_protected(*rap, | |
296 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
297 | rap = &ra->next) { | |
1da177e4 LT |
298 | if (ra->sk == sk) { |
299 | if (on) { | |
66018506 | 300 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 301 | kfree(new_ra); |
1da177e4 LT |
302 | return -EADDRINUSE; |
303 | } | |
592fcb9d ED |
304 | /* dont let ip_call_ra_chain() use sk again */ |
305 | ra->sk = NULL; | |
8e380f00 | 306 | RCU_INIT_POINTER(*rap, ra->next); |
66018506 | 307 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
308 | |
309 | if (ra->destructor) | |
310 | ra->destructor(sk); | |
592fcb9d ED |
311 | /* |
312 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
313 | * period. This guarantee ip_call_ra_chain() dont need | |
314 | * to mess with socket refcounts. | |
315 | */ | |
316 | ra->saved_sk = sk; | |
317 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
318 | return 0; |
319 | } | |
320 | } | |
321 | if (new_ra == NULL) { | |
66018506 | 322 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
323 | return -ENOBUFS; |
324 | } | |
325 | new_ra->sk = sk; | |
326 | new_ra->destructor = destructor; | |
327 | ||
8e380f00 | 328 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 329 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 330 | sock_hold(sk); |
66018506 | 331 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
332 | |
333 | return 0; | |
334 | } | |
335 | ||
e905a9ed | 336 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 337 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 338 | { |
1da177e4 LT |
339 | struct sock_exterr_skb *serr; |
340 | ||
1da177e4 LT |
341 | skb = skb_clone(skb, GFP_ATOMIC); |
342 | if (!skb) | |
343 | return; | |
344 | ||
e905a9ed | 345 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
346 | serr->ee.ee_errno = err; |
347 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
348 | serr->ee.ee_type = icmp_hdr(skb)->type; |
349 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
350 | serr->ee.ee_pad = 0; |
351 | serr->ee.ee_info = info; | |
352 | serr->ee.ee_data = 0; | |
88c7664f | 353 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 354 | skb_network_header(skb); |
1da177e4 LT |
355 | serr->port = port; |
356 | ||
bd82393c ACM |
357 | if (skb_pull(skb, payload - skb->data) != NULL) { |
358 | skb_reset_transport_header(skb); | |
359 | if (sock_queue_err_skb(sk, skb) == 0) | |
360 | return; | |
361 | } | |
362 | kfree_skb(skb); | |
1da177e4 LT |
363 | } |
364 | ||
0579016e | 365 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
366 | { |
367 | struct inet_sock *inet = inet_sk(sk); | |
368 | struct sock_exterr_skb *serr; | |
369 | struct iphdr *iph; | |
370 | struct sk_buff *skb; | |
371 | ||
372 | if (!inet->recverr) | |
373 | return; | |
374 | ||
375 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
376 | if (!skb) | |
377 | return; | |
378 | ||
2ca9e6f2 ACM |
379 | skb_put(skb, sizeof(struct iphdr)); |
380 | skb_reset_network_header(skb); | |
eddc9ec5 | 381 | iph = ip_hdr(skb); |
1da177e4 LT |
382 | iph->daddr = daddr; |
383 | ||
e905a9ed | 384 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
385 | serr->ee.ee_errno = err; |
386 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 387 | serr->ee.ee_type = 0; |
1da177e4 LT |
388 | serr->ee.ee_code = 0; |
389 | serr->ee.ee_pad = 0; | |
390 | serr->ee.ee_info = info; | |
391 | serr->ee.ee_data = 0; | |
d56f90a7 | 392 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
393 | serr->port = port; |
394 | ||
27a884dc | 395 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 396 | skb_reset_transport_header(skb); |
1da177e4 LT |
397 | |
398 | if (sock_queue_err_skb(sk, skb)) | |
399 | kfree_skb(skb); | |
400 | } | |
401 | ||
829ae9d6 WB |
402 | static bool ipv4_pktinfo_prepare_errqueue(const struct sock *sk, |
403 | const struct sk_buff *skb, | |
404 | int ee_origin) | |
405 | { | |
406 | struct in_pktinfo *info = PKTINFO_SKB_CB(skb); | |
407 | ||
408 | if ((ee_origin != SO_EE_ORIGIN_TIMESTAMPING) || | |
409 | (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || | |
410 | (!skb->dev)) | |
411 | return false; | |
412 | ||
413 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
414 | info->ipi_ifindex = skb->dev->ifindex; | |
415 | return true; | |
416 | } | |
417 | ||
e905a9ed | 418 | /* |
1da177e4 LT |
419 | * Handle MSG_ERRQUEUE |
420 | */ | |
85fbaa75 | 421 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
422 | { |
423 | struct sock_exterr_skb *serr; | |
364a9e93 | 424 | struct sk_buff *skb; |
342dfc30 | 425 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
426 | struct { |
427 | struct sock_extended_err ee; | |
428 | struct sockaddr_in offender; | |
429 | } errhdr; | |
430 | int err; | |
431 | int copied; | |
432 | ||
7ce875e5 WB |
433 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
434 | ||
1da177e4 | 435 | err = -EAGAIN; |
364a9e93 | 436 | skb = sock_dequeue_err_skb(sk); |
1da177e4 LT |
437 | if (skb == NULL) |
438 | goto out; | |
439 | ||
440 | copied = skb->len; | |
441 | if (copied > len) { | |
442 | msg->msg_flags |= MSG_TRUNC; | |
443 | copied = len; | |
444 | } | |
51f3d02b | 445 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
446 | if (err) |
447 | goto out_free_skb; | |
448 | ||
449 | sock_recv_timestamp(msg, sk, skb); | |
450 | ||
451 | serr = SKB_EXT_ERR(skb); | |
452 | ||
1da177e4 LT |
453 | if (sin) { |
454 | sin->sin_family = AF_INET; | |
d56f90a7 ACM |
455 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
456 | serr->addr_offset); | |
1da177e4 LT |
457 | sin->sin_port = serr->port; |
458 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 459 | *addr_len = sizeof(*sin); |
1da177e4 LT |
460 | } |
461 | ||
462 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
463 | sin = &errhdr.offender; | |
464 | sin->sin_family = AF_UNSPEC; | |
829ae9d6 WB |
465 | |
466 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
467 | ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin)) { | |
1da177e4 LT |
468 | struct inet_sock *inet = inet_sk(sk); |
469 | ||
470 | sin->sin_family = AF_INET; | |
eddc9ec5 | 471 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
472 | sin->sin_port = 0; |
473 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
474 | if (inet->cmsg_flags) | |
475 | ip_cmsg_recv(msg, skb); | |
476 | } | |
477 | ||
478 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
479 | ||
480 | /* Now we could try to dump offended packet options */ | |
481 | ||
482 | msg->msg_flags |= MSG_ERRQUEUE; | |
483 | err = copied; | |
484 | ||
e905a9ed | 485 | out_free_skb: |
1da177e4 LT |
486 | kfree_skb(skb); |
487 | out: | |
488 | return err; | |
489 | } | |
490 | ||
491 | ||
492 | /* | |
4d52cfbe ED |
493 | * Socket option code for IP. This is the end of the line after any |
494 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
495 | */ |
496 | ||
3fdadf7d | 497 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 498 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
499 | { |
500 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 501 | int val = 0, err; |
1da177e4 | 502 | |
0c9f79be XW |
503 | switch (optname) { |
504 | case IP_PKTINFO: | |
505 | case IP_RECVTTL: | |
506 | case IP_RECVOPTS: | |
507 | case IP_RECVTOS: | |
508 | case IP_RETOPTS: | |
509 | case IP_TOS: | |
510 | case IP_TTL: | |
511 | case IP_HDRINCL: | |
512 | case IP_MTU_DISCOVER: | |
513 | case IP_RECVERR: | |
514 | case IP_ROUTER_ALERT: | |
515 | case IP_FREEBIND: | |
516 | case IP_PASSSEC: | |
517 | case IP_TRANSPARENT: | |
518 | case IP_MINTTL: | |
519 | case IP_NODEFRAG: | |
520 | case IP_UNICAST_IF: | |
521 | case IP_MULTICAST_TTL: | |
522 | case IP_MULTICAST_ALL: | |
523 | case IP_MULTICAST_LOOP: | |
524 | case IP_RECVORIGDSTADDR: | |
1da177e4 LT |
525 | if (optlen >= sizeof(int)) { |
526 | if (get_user(val, (int __user *) optval)) | |
527 | return -EFAULT; | |
528 | } else if (optlen >= sizeof(char)) { | |
529 | unsigned char ucval; | |
530 | ||
531 | if (get_user(ucval, (unsigned char __user *) optval)) | |
532 | return -EFAULT; | |
533 | val = (int) ucval; | |
534 | } | |
535 | } | |
536 | ||
537 | /* If optlen==0, it is equivalent to val == 0 */ | |
538 | ||
6a9fb947 | 539 | if (ip_mroute_opt(optname)) |
09cb105e | 540 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
541 | |
542 | err = 0; | |
543 | lock_sock(sk); | |
544 | ||
545 | switch (optname) { | |
132adf54 SH |
546 | case IP_OPTIONS: |
547 | { | |
f6d8bd05 ED |
548 | struct ip_options_rcu *old, *opt = NULL; |
549 | ||
65a1c4ff | 550 | if (optlen > 40) |
132adf54 | 551 | goto e_inval; |
3b1e0a65 | 552 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 553 | optval, optlen); |
132adf54 SH |
554 | if (err) |
555 | break; | |
f6d8bd05 ED |
556 | old = rcu_dereference_protected(inet->inet_opt, |
557 | sock_owned_by_user(sk)); | |
132adf54 SH |
558 | if (inet->is_icsk) { |
559 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 560 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
561 | if (sk->sk_family == PF_INET || |
562 | (!((1 << sk->sk_state) & | |
563 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 564 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 565 | #endif |
f6d8bd05 ED |
566 | if (old) |
567 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 568 | if (opt) |
f6d8bd05 | 569 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 570 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 571 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 572 | } |
132adf54 | 573 | #endif |
1da177e4 | 574 | } |
f6d8bd05 ED |
575 | rcu_assign_pointer(inet->inet_opt, opt); |
576 | if (old) | |
605b4afe | 577 | kfree_rcu(old, rcu); |
132adf54 SH |
578 | break; |
579 | } | |
580 | case IP_PKTINFO: | |
581 | if (val) | |
582 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
583 | else | |
584 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
585 | break; | |
586 | case IP_RECVTTL: | |
587 | if (val) | |
588 | inet->cmsg_flags |= IP_CMSG_TTL; | |
589 | else | |
590 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
591 | break; | |
592 | case IP_RECVTOS: | |
593 | if (val) | |
594 | inet->cmsg_flags |= IP_CMSG_TOS; | |
595 | else | |
596 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
597 | break; | |
598 | case IP_RECVOPTS: | |
599 | if (val) | |
600 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
601 | else | |
602 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
603 | break; | |
604 | case IP_RETOPTS: | |
605 | if (val) | |
606 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
607 | else | |
608 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
609 | break; | |
610 | case IP_PASSSEC: | |
611 | if (val) | |
612 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
613 | else | |
614 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
615 | break; | |
e8b2dfe9 BS |
616 | case IP_RECVORIGDSTADDR: |
617 | if (val) | |
618 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
619 | else | |
620 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
621 | break; | |
132adf54 SH |
622 | case IP_TOS: /* This sets both TOS and Precedence */ |
623 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
624 | val &= ~INET_ECN_MASK; |
625 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 626 | } |
132adf54 SH |
627 | if (inet->tos != val) { |
628 | inet->tos = val; | |
629 | sk->sk_priority = rt_tos2priority(val); | |
630 | sk_dst_reset(sk); | |
631 | } | |
632 | break; | |
633 | case IP_TTL: | |
4d52cfbe | 634 | if (optlen < 1) |
132adf54 | 635 | goto e_inval; |
c9be4a5c | 636 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
637 | goto e_inval; |
638 | inet->uc_ttl = val; | |
639 | break; | |
640 | case IP_HDRINCL: | |
641 | if (sk->sk_type != SOCK_RAW) { | |
642 | err = -ENOPROTOOPT; | |
2c7946a7 | 643 | break; |
132adf54 SH |
644 | } |
645 | inet->hdrincl = val ? 1 : 0; | |
646 | break; | |
7b2ff18e JO |
647 | case IP_NODEFRAG: |
648 | if (sk->sk_type != SOCK_RAW) { | |
649 | err = -ENOPROTOOPT; | |
650 | break; | |
651 | } | |
652 | inet->nodefrag = val ? 1 : 0; | |
653 | break; | |
132adf54 | 654 | case IP_MTU_DISCOVER: |
1b346576 | 655 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
656 | goto e_inval; |
657 | inet->pmtudisc = val; | |
658 | break; | |
659 | case IP_RECVERR: | |
660 | inet->recverr = !!val; | |
661 | if (!val) | |
662 | skb_queue_purge(&sk->sk_error_queue); | |
663 | break; | |
664 | case IP_MULTICAST_TTL: | |
665 | if (sk->sk_type == SOCK_STREAM) | |
666 | goto e_inval; | |
4d52cfbe | 667 | if (optlen < 1) |
132adf54 | 668 | goto e_inval; |
09cb105e | 669 | if (val == -1) |
132adf54 SH |
670 | val = 1; |
671 | if (val < 0 || val > 255) | |
672 | goto e_inval; | |
673 | inet->mc_ttl = val; | |
674 | break; | |
675 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 676 | if (optlen < 1) |
132adf54 SH |
677 | goto e_inval; |
678 | inet->mc_loop = !!val; | |
679 | break; | |
76e21053 EH |
680 | case IP_UNICAST_IF: |
681 | { | |
682 | struct net_device *dev = NULL; | |
683 | int ifindex; | |
684 | ||
685 | if (optlen != sizeof(int)) | |
686 | goto e_inval; | |
687 | ||
688 | ifindex = (__force int)ntohl((__force __be32)val); | |
689 | if (ifindex == 0) { | |
690 | inet->uc_index = 0; | |
691 | err = 0; | |
692 | break; | |
693 | } | |
694 | ||
695 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
696 | err = -EADDRNOTAVAIL; | |
697 | if (!dev) | |
698 | break; | |
699 | dev_put(dev); | |
700 | ||
701 | err = -EINVAL; | |
702 | if (sk->sk_bound_dev_if) | |
703 | break; | |
704 | ||
705 | inet->uc_index = ifindex; | |
706 | err = 0; | |
707 | break; | |
708 | } | |
132adf54 SH |
709 | case IP_MULTICAST_IF: |
710 | { | |
711 | struct ip_mreqn mreq; | |
712 | struct net_device *dev = NULL; | |
713 | ||
714 | if (sk->sk_type == SOCK_STREAM) | |
715 | goto e_inval; | |
716 | /* | |
717 | * Check the arguments are allowable | |
718 | */ | |
719 | ||
0915921b SW |
720 | if (optlen < sizeof(struct in_addr)) |
721 | goto e_inval; | |
722 | ||
132adf54 SH |
723 | err = -EFAULT; |
724 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 725 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 726 | break; |
132adf54 SH |
727 | } else { |
728 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
729 | if (optlen >= sizeof(struct ip_mreq)) { |
730 | if (copy_from_user(&mreq, optval, | |
731 | sizeof(struct ip_mreq))) | |
732 | break; | |
733 | } else if (optlen >= sizeof(struct in_addr)) { | |
734 | if (copy_from_user(&mreq.imr_address, optval, | |
735 | sizeof(struct in_addr))) | |
736 | break; | |
737 | } | |
132adf54 SH |
738 | } |
739 | ||
740 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 741 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
742 | inet->mc_index = 0; |
743 | inet->mc_addr = 0; | |
744 | err = 0; | |
1da177e4 LT |
745 | break; |
746 | } | |
3b1e0a65 | 747 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 748 | if (dev) |
132adf54 | 749 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 750 | } else |
55b80503 | 751 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 752 | |
1da177e4 | 753 | |
132adf54 SH |
754 | err = -EADDRNOTAVAIL; |
755 | if (!dev) | |
756 | break; | |
55b80503 | 757 | dev_put(dev); |
132adf54 SH |
758 | |
759 | err = -EINVAL; | |
760 | if (sk->sk_bound_dev_if && | |
761 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
762 | break; | |
1da177e4 | 763 | |
132adf54 SH |
764 | inet->mc_index = mreq.imr_ifindex; |
765 | inet->mc_addr = mreq.imr_address.s_addr; | |
766 | err = 0; | |
767 | break; | |
768 | } | |
1da177e4 | 769 | |
132adf54 SH |
770 | case IP_ADD_MEMBERSHIP: |
771 | case IP_DROP_MEMBERSHIP: | |
772 | { | |
773 | struct ip_mreqn mreq; | |
1da177e4 | 774 | |
a96fb49b FL |
775 | err = -EPROTO; |
776 | if (inet_sk(sk)->is_icsk) | |
777 | break; | |
778 | ||
132adf54 SH |
779 | if (optlen < sizeof(struct ip_mreq)) |
780 | goto e_inval; | |
781 | err = -EFAULT; | |
782 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 783 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 784 | break; |
132adf54 SH |
785 | } else { |
786 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 787 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 788 | break; |
132adf54 | 789 | } |
1da177e4 | 790 | |
132adf54 SH |
791 | if (optname == IP_ADD_MEMBERSHIP) |
792 | err = ip_mc_join_group(sk, &mreq); | |
793 | else | |
794 | err = ip_mc_leave_group(sk, &mreq); | |
795 | break; | |
796 | } | |
797 | case IP_MSFILTER: | |
798 | { | |
132adf54 SH |
799 | struct ip_msfilter *msf; |
800 | ||
801 | if (optlen < IP_MSFILTER_SIZE(0)) | |
802 | goto e_inval; | |
803 | if (optlen > sysctl_optmem_max) { | |
804 | err = -ENOBUFS; | |
1da177e4 LT |
805 | break; |
806 | } | |
132adf54 | 807 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 808 | if (!msf) { |
132adf54 SH |
809 | err = -ENOBUFS; |
810 | break; | |
811 | } | |
812 | err = -EFAULT; | |
813 | if (copy_from_user(msf, optval, optlen)) { | |
814 | kfree(msf); | |
815 | break; | |
816 | } | |
817 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
818 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
819 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
820 | kfree(msf); | |
821 | err = -ENOBUFS; | |
822 | break; | |
823 | } | |
824 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
825 | kfree(msf); | |
826 | err = -EINVAL; | |
827 | break; | |
828 | } | |
829 | err = ip_mc_msfilter(sk, msf, 0); | |
830 | kfree(msf); | |
831 | break; | |
832 | } | |
833 | case IP_BLOCK_SOURCE: | |
834 | case IP_UNBLOCK_SOURCE: | |
835 | case IP_ADD_SOURCE_MEMBERSHIP: | |
836 | case IP_DROP_SOURCE_MEMBERSHIP: | |
837 | { | |
838 | struct ip_mreq_source mreqs; | |
839 | int omode, add; | |
1da177e4 | 840 | |
132adf54 SH |
841 | if (optlen != sizeof(struct ip_mreq_source)) |
842 | goto e_inval; | |
843 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 844 | err = -EFAULT; |
1da177e4 LT |
845 | break; |
846 | } | |
132adf54 SH |
847 | if (optname == IP_BLOCK_SOURCE) { |
848 | omode = MCAST_EXCLUDE; | |
849 | add = 1; | |
850 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
851 | omode = MCAST_EXCLUDE; | |
852 | add = 0; | |
853 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
854 | struct ip_mreqn mreq; | |
1da177e4 | 855 | |
132adf54 SH |
856 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
857 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
858 | mreq.imr_ifindex = 0; | |
859 | err = ip_mc_join_group(sk, &mreq); | |
860 | if (err && err != -EADDRINUSE) | |
1da177e4 | 861 | break; |
132adf54 SH |
862 | omode = MCAST_INCLUDE; |
863 | add = 1; | |
864 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
865 | omode = MCAST_INCLUDE; | |
866 | add = 0; | |
867 | } | |
868 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
869 | break; | |
870 | } | |
871 | case MCAST_JOIN_GROUP: | |
872 | case MCAST_LEAVE_GROUP: | |
873 | { | |
874 | struct group_req greq; | |
875 | struct sockaddr_in *psin; | |
876 | struct ip_mreqn mreq; | |
877 | ||
878 | if (optlen < sizeof(struct group_req)) | |
879 | goto e_inval; | |
880 | err = -EFAULT; | |
881 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
882 | break; | |
883 | psin = (struct sockaddr_in *)&greq.gr_group; | |
884 | if (psin->sin_family != AF_INET) | |
885 | goto e_inval; | |
886 | memset(&mreq, 0, sizeof(mreq)); | |
887 | mreq.imr_multiaddr = psin->sin_addr; | |
888 | mreq.imr_ifindex = greq.gr_interface; | |
889 | ||
890 | if (optname == MCAST_JOIN_GROUP) | |
891 | err = ip_mc_join_group(sk, &mreq); | |
892 | else | |
893 | err = ip_mc_leave_group(sk, &mreq); | |
894 | break; | |
895 | } | |
896 | case MCAST_JOIN_SOURCE_GROUP: | |
897 | case MCAST_LEAVE_SOURCE_GROUP: | |
898 | case MCAST_BLOCK_SOURCE: | |
899 | case MCAST_UNBLOCK_SOURCE: | |
900 | { | |
901 | struct group_source_req greqs; | |
902 | struct ip_mreq_source mreqs; | |
903 | struct sockaddr_in *psin; | |
904 | int omode, add; | |
905 | ||
906 | if (optlen != sizeof(struct group_source_req)) | |
907 | goto e_inval; | |
908 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 909 | err = -EFAULT; |
1da177e4 LT |
910 | break; |
911 | } | |
132adf54 SH |
912 | if (greqs.gsr_group.ss_family != AF_INET || |
913 | greqs.gsr_source.ss_family != AF_INET) { | |
914 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
915 | break; |
916 | } | |
132adf54 SH |
917 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
918 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
919 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
920 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
921 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
922 | ||
923 | if (optname == MCAST_BLOCK_SOURCE) { | |
924 | omode = MCAST_EXCLUDE; | |
925 | add = 1; | |
926 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
927 | omode = MCAST_EXCLUDE; | |
928 | add = 0; | |
929 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
930 | struct ip_mreqn mreq; |
931 | ||
132adf54 | 932 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 933 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
934 | mreq.imr_address.s_addr = 0; |
935 | mreq.imr_ifindex = greqs.gsr_interface; | |
936 | err = ip_mc_join_group(sk, &mreq); | |
937 | if (err && err != -EADDRINUSE) | |
938 | break; | |
939 | greqs.gsr_interface = mreq.imr_ifindex; | |
940 | omode = MCAST_INCLUDE; | |
941 | add = 1; | |
942 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
943 | omode = MCAST_INCLUDE; | |
944 | add = 0; | |
945 | } | |
946 | err = ip_mc_source(add, omode, sk, &mreqs, | |
947 | greqs.gsr_interface); | |
948 | break; | |
949 | } | |
950 | case MCAST_MSFILTER: | |
951 | { | |
132adf54 SH |
952 | struct sockaddr_in *psin; |
953 | struct ip_msfilter *msf = NULL; | |
954 | struct group_filter *gsf = NULL; | |
955 | int msize, i, ifindex; | |
956 | ||
957 | if (optlen < GROUP_FILTER_SIZE(0)) | |
958 | goto e_inval; | |
959 | if (optlen > sysctl_optmem_max) { | |
960 | err = -ENOBUFS; | |
1da177e4 LT |
961 | break; |
962 | } | |
09cb105e | 963 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 964 | if (!gsf) { |
132adf54 | 965 | err = -ENOBUFS; |
1da177e4 LT |
966 | break; |
967 | } | |
132adf54 | 968 | err = -EFAULT; |
4d52cfbe | 969 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 970 | goto mc_msf_out; |
4d52cfbe | 971 | |
132adf54 SH |
972 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
973 | if (gsf->gf_numsrc >= 0x1ffffff || | |
974 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
975 | err = -ENOBUFS; | |
976 | goto mc_msf_out; | |
977 | } | |
978 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
979 | err = -EINVAL; | |
980 | goto mc_msf_out; | |
981 | } | |
982 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 983 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 984 | if (!msf) { |
132adf54 SH |
985 | err = -ENOBUFS; |
986 | goto mc_msf_out; | |
987 | } | |
988 | ifindex = gsf->gf_interface; | |
989 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
990 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 991 | err = -EADDRNOTAVAIL; |
132adf54 | 992 | goto mc_msf_out; |
1da177e4 | 993 | } |
132adf54 SH |
994 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
995 | msf->imsf_interface = 0; | |
996 | msf->imsf_fmode = gsf->gf_fmode; | |
997 | msf->imsf_numsrc = gsf->gf_numsrc; | |
998 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 999 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1000 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1001 | |
132adf54 SH |
1002 | if (psin->sin_family != AF_INET) |
1003 | goto mc_msf_out; | |
1004 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1005 | } | |
1006 | kfree(gsf); | |
1007 | gsf = NULL; | |
1008 | ||
1009 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1010 | mc_msf_out: |
132adf54 SH |
1011 | kfree(msf); |
1012 | kfree(gsf); | |
1013 | break; | |
1014 | } | |
f771bef9 NS |
1015 | case IP_MULTICAST_ALL: |
1016 | if (optlen < 1) | |
1017 | goto e_inval; | |
1018 | if (val != 0 && val != 1) | |
1019 | goto e_inval; | |
1020 | inet->mc_all = val; | |
1021 | break; | |
132adf54 SH |
1022 | case IP_ROUTER_ALERT: |
1023 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1024 | break; | |
1025 | ||
1026 | case IP_FREEBIND: | |
4d52cfbe | 1027 | if (optlen < 1) |
132adf54 SH |
1028 | goto e_inval; |
1029 | inet->freebind = !!val; | |
1030 | break; | |
1031 | ||
1032 | case IP_IPSEC_POLICY: | |
1033 | case IP_XFRM_POLICY: | |
1034 | err = -EPERM; | |
52e804c6 | 1035 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1036 | break; |
132adf54 SH |
1037 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1038 | break; | |
1da177e4 | 1039 | |
f5715aea | 1040 | case IP_TRANSPARENT: |
52e804c6 EB |
1041 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1042 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1043 | err = -EPERM; |
1044 | break; | |
1045 | } | |
1046 | if (optlen < 1) | |
1047 | goto e_inval; | |
1048 | inet->transparent = !!val; | |
1049 | break; | |
1050 | ||
d218d111 SH |
1051 | case IP_MINTTL: |
1052 | if (optlen < 1) | |
1053 | goto e_inval; | |
1054 | if (val < 0 || val > 255) | |
1055 | goto e_inval; | |
1056 | inet->min_ttl = val; | |
1057 | break; | |
1058 | ||
132adf54 SH |
1059 | default: |
1060 | err = -ENOPROTOOPT; | |
1061 | break; | |
1da177e4 LT |
1062 | } |
1063 | release_sock(sk); | |
1064 | return err; | |
1065 | ||
1066 | e_inval: | |
1067 | release_sock(sk); | |
1068 | return -EINVAL; | |
1069 | } | |
1070 | ||
f84af32c | 1071 | /** |
829ae9d6 | 1072 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1073 | * @sk: socket |
1074 | * @skb: buffer | |
1075 | * | |
35ebf65e DM |
1076 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1077 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1078 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1079 | */ |
fbf8866d | 1080 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1081 | { |
d826eb14 | 1082 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1083 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1084 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1085 | |
4b261c75 | 1086 | if (prepare && skb_rtable(skb)) { |
92101b3b | 1087 | pktinfo->ipi_ifindex = inet_iif(skb); |
35ebf65e | 1088 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1089 | } else { |
1090 | pktinfo->ipi_ifindex = 0; | |
1091 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1092 | } | |
1093 | skb_dst_drop(skb); | |
f84af32c | 1094 | } |
f84af32c | 1095 | |
3fdadf7d | 1096 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1097 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1098 | { |
1099 | int err; | |
1100 | ||
1101 | if (level != SOL_IP) | |
1102 | return -ENOPROTOOPT; | |
1103 | ||
1104 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1105 | #ifdef CONFIG_NETFILTER | |
1106 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1107 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1108 | optname != IP_IPSEC_POLICY && |
1109 | optname != IP_XFRM_POLICY && | |
1110 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1111 | lock_sock(sk); |
1112 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1113 | release_sock(sk); | |
1114 | } | |
1115 | #endif | |
1116 | return err; | |
1117 | } | |
4d52cfbe | 1118 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1119 | |
1120 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1121 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1122 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1123 | { |
1124 | int err; | |
1125 | ||
1126 | if (level != SOL_IP) | |
1127 | return -ENOPROTOOPT; | |
1128 | ||
dae50295 DS |
1129 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1130 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1131 | ip_setsockopt); | |
1132 | ||
3fdadf7d DM |
1133 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1134 | #ifdef CONFIG_NETFILTER | |
1135 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1136 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1137 | optname != IP_IPSEC_POLICY && |
1138 | optname != IP_XFRM_POLICY && | |
1139 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1140 | lock_sock(sk); |
543d9cfe ACM |
1141 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1142 | optval, optlen); | |
3fdadf7d DM |
1143 | release_sock(sk); |
1144 | } | |
1145 | #endif | |
1146 | return err; | |
1147 | } | |
543d9cfe | 1148 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1149 | #endif |
1150 | ||
1da177e4 | 1151 | /* |
4d52cfbe ED |
1152 | * Get the options. Note for future reference. The GET of IP options gets |
1153 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1154 | */ |
1155 | ||
3fdadf7d | 1156 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1157 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1158 | { |
1159 | struct inet_sock *inet = inet_sk(sk); | |
1160 | int val; | |
1161 | int len; | |
e905a9ed | 1162 | |
132adf54 | 1163 | if (level != SOL_IP) |
1da177e4 LT |
1164 | return -EOPNOTSUPP; |
1165 | ||
6a9fb947 | 1166 | if (ip_mroute_opt(optname)) |
09cb105e | 1167 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1168 | |
09cb105e | 1169 | if (get_user(len, optlen)) |
1da177e4 | 1170 | return -EFAULT; |
132adf54 | 1171 | if (len < 0) |
1da177e4 | 1172 | return -EINVAL; |
e905a9ed | 1173 | |
1da177e4 LT |
1174 | lock_sock(sk); |
1175 | ||
132adf54 SH |
1176 | switch (optname) { |
1177 | case IP_OPTIONS: | |
1178 | { | |
1179 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1180 | struct ip_options *opt = (struct ip_options *)optbuf; |
1181 | struct ip_options_rcu *inet_opt; | |
1182 | ||
1183 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1184 | sock_owned_by_user(sk)); | |
132adf54 | 1185 | opt->optlen = 0; |
f6d8bd05 ED |
1186 | if (inet_opt) |
1187 | memcpy(optbuf, &inet_opt->opt, | |
1188 | sizeof(struct ip_options) + | |
1189 | inet_opt->opt.optlen); | |
132adf54 SH |
1190 | release_sock(sk); |
1191 | ||
1192 | if (opt->optlen == 0) | |
1193 | return put_user(0, optlen); | |
1194 | ||
1195 | ip_options_undo(opt); | |
1196 | ||
1197 | len = min_t(unsigned int, len, opt->optlen); | |
1198 | if (put_user(len, optlen)) | |
1199 | return -EFAULT; | |
1200 | if (copy_to_user(optval, opt->__data, len)) | |
1201 | return -EFAULT; | |
1202 | return 0; | |
1203 | } | |
1204 | case IP_PKTINFO: | |
1205 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1206 | break; | |
1207 | case IP_RECVTTL: | |
1208 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1209 | break; | |
1210 | case IP_RECVTOS: | |
1211 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1212 | break; | |
1213 | case IP_RECVOPTS: | |
1214 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1215 | break; | |
1216 | case IP_RETOPTS: | |
1217 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1218 | break; | |
1219 | case IP_PASSSEC: | |
1220 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1221 | break; | |
e8b2dfe9 BS |
1222 | case IP_RECVORIGDSTADDR: |
1223 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1224 | break; | |
132adf54 SH |
1225 | case IP_TOS: |
1226 | val = inet->tos; | |
1227 | break; | |
1228 | case IP_TTL: | |
1229 | val = (inet->uc_ttl == -1 ? | |
1230 | sysctl_ip_default_ttl : | |
1231 | inet->uc_ttl); | |
1232 | break; | |
1233 | case IP_HDRINCL: | |
1234 | val = inet->hdrincl; | |
1235 | break; | |
a89b4763 MK |
1236 | case IP_NODEFRAG: |
1237 | val = inet->nodefrag; | |
1238 | break; | |
132adf54 SH |
1239 | case IP_MTU_DISCOVER: |
1240 | val = inet->pmtudisc; | |
1241 | break; | |
1242 | case IP_MTU: | |
1243 | { | |
1244 | struct dst_entry *dst; | |
1245 | val = 0; | |
1246 | dst = sk_dst_get(sk); | |
1247 | if (dst) { | |
1248 | val = dst_mtu(dst); | |
1249 | dst_release(dst); | |
1da177e4 | 1250 | } |
132adf54 | 1251 | if (!val) { |
1da177e4 | 1252 | release_sock(sk); |
132adf54 | 1253 | return -ENOTCONN; |
1da177e4 | 1254 | } |
132adf54 SH |
1255 | break; |
1256 | } | |
1257 | case IP_RECVERR: | |
1258 | val = inet->recverr; | |
1259 | break; | |
1260 | case IP_MULTICAST_TTL: | |
1261 | val = inet->mc_ttl; | |
1262 | break; | |
1263 | case IP_MULTICAST_LOOP: | |
1264 | val = inet->mc_loop; | |
1265 | break; | |
76e21053 EH |
1266 | case IP_UNICAST_IF: |
1267 | val = (__force int)htonl((__u32) inet->uc_index); | |
1268 | break; | |
132adf54 SH |
1269 | case IP_MULTICAST_IF: |
1270 | { | |
1271 | struct in_addr addr; | |
1272 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1273 | addr.s_addr = inet->mc_addr; | |
1274 | release_sock(sk); | |
1da177e4 | 1275 | |
132adf54 SH |
1276 | if (put_user(len, optlen)) |
1277 | return -EFAULT; | |
1278 | if (copy_to_user(optval, &addr, len)) | |
1279 | return -EFAULT; | |
1280 | return 0; | |
1281 | } | |
1282 | case IP_MSFILTER: | |
1283 | { | |
1284 | struct ip_msfilter msf; | |
1285 | int err; | |
1286 | ||
1287 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1288 | release_sock(sk); |
132adf54 | 1289 | return -EINVAL; |
1da177e4 | 1290 | } |
132adf54 | 1291 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1292 | release_sock(sk); |
132adf54 | 1293 | return -EFAULT; |
1da177e4 | 1294 | } |
132adf54 SH |
1295 | err = ip_mc_msfget(sk, &msf, |
1296 | (struct ip_msfilter __user *)optval, optlen); | |
1297 | release_sock(sk); | |
1298 | return err; | |
1299 | } | |
1300 | case MCAST_MSFILTER: | |
1301 | { | |
1302 | struct group_filter gsf; | |
1303 | int err; | |
1da177e4 | 1304 | |
132adf54 | 1305 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1306 | release_sock(sk); |
132adf54 SH |
1307 | return -EINVAL; |
1308 | } | |
1309 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1310 | release_sock(sk); | |
1311 | return -EFAULT; | |
1312 | } | |
1313 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1314 | (struct group_filter __user *)optval, |
1315 | optlen); | |
132adf54 SH |
1316 | release_sock(sk); |
1317 | return err; | |
1318 | } | |
f771bef9 NS |
1319 | case IP_MULTICAST_ALL: |
1320 | val = inet->mc_all; | |
1321 | break; | |
132adf54 SH |
1322 | case IP_PKTOPTIONS: |
1323 | { | |
1324 | struct msghdr msg; | |
1da177e4 | 1325 | |
132adf54 | 1326 | release_sock(sk); |
1da177e4 | 1327 | |
132adf54 SH |
1328 | if (sk->sk_type != SOCK_STREAM) |
1329 | return -ENOPROTOOPT; | |
1da177e4 | 1330 | |
c54a5e02 | 1331 | msg.msg_control = (__force void *) optval; |
132adf54 | 1332 | msg.msg_controllen = len; |
dd23198e | 1333 | msg.msg_flags = flags; |
1da177e4 | 1334 | |
132adf54 SH |
1335 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1336 | struct in_pktinfo info; | |
1337 | ||
c720c7e8 ED |
1338 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1339 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1340 | info.ipi_ifindex = inet->mc_index; |
1341 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1342 | } |
132adf54 SH |
1343 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1344 | int hlim = inet->mc_ttl; | |
1345 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1346 | } | |
4c507d28 JB |
1347 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1348 | int tos = inet->rcv_tos; | |
1349 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1350 | } | |
132adf54 SH |
1351 | len -= msg.msg_controllen; |
1352 | return put_user(len, optlen); | |
1353 | } | |
1354 | case IP_FREEBIND: | |
1355 | val = inet->freebind; | |
1356 | break; | |
f5715aea KK |
1357 | case IP_TRANSPARENT: |
1358 | val = inet->transparent; | |
1359 | break; | |
d218d111 SH |
1360 | case IP_MINTTL: |
1361 | val = inet->min_ttl; | |
1362 | break; | |
132adf54 SH |
1363 | default: |
1364 | release_sock(sk); | |
1365 | return -ENOPROTOOPT; | |
1da177e4 LT |
1366 | } |
1367 | release_sock(sk); | |
e905a9ed | 1368 | |
4d52cfbe | 1369 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1370 | unsigned char ucval = (unsigned char)val; |
1371 | len = 1; | |
132adf54 | 1372 | if (put_user(len, optlen)) |
1da177e4 | 1373 | return -EFAULT; |
09cb105e | 1374 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1375 | return -EFAULT; |
1376 | } else { | |
1377 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1378 | if (put_user(len, optlen)) |
1da177e4 | 1379 | return -EFAULT; |
09cb105e | 1380 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1381 | return -EFAULT; |
1382 | } | |
1383 | return 0; | |
1384 | } | |
1385 | ||
3fdadf7d | 1386 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1387 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1388 | { |
1389 | int err; | |
1390 | ||
dd23198e | 1391 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1392 | #ifdef CONFIG_NETFILTER |
1393 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1394 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1395 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1396 | int len; |
3fdadf7d | 1397 | |
09cb105e | 1398 | if (get_user(len, optlen)) |
3fdadf7d DM |
1399 | return -EFAULT; |
1400 | ||
1401 | lock_sock(sk); | |
1402 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1403 | &len); | |
1404 | release_sock(sk); | |
1405 | if (err >= 0) | |
1406 | err = put_user(len, optlen); | |
1407 | return err; | |
1408 | } | |
1409 | #endif | |
1410 | return err; | |
1411 | } | |
4d52cfbe | 1412 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1413 | |
1414 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1415 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1416 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1417 | { |
42908c69 DS |
1418 | int err; |
1419 | ||
1420 | if (optname == MCAST_MSFILTER) | |
1421 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1422 | ip_getsockopt); | |
1423 | ||
dd23198e DB |
1424 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1425 | MSG_CMSG_COMPAT); | |
42908c69 | 1426 | |
3fdadf7d DM |
1427 | #ifdef CONFIG_NETFILTER |
1428 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1429 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1430 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1431 | int len; |
3fdadf7d | 1432 | |
543d9cfe | 1433 | if (get_user(len, optlen)) |
3fdadf7d DM |
1434 | return -EFAULT; |
1435 | ||
1436 | lock_sock(sk); | |
543d9cfe | 1437 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1438 | release_sock(sk); |
1439 | if (err >= 0) | |
1440 | err = put_user(len, optlen); | |
1441 | return err; | |
1442 | } | |
1443 | #endif | |
1444 | return err; | |
1445 | } | |
543d9cfe | 1446 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1447 | #endif |