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> |
ad6f939a | 40 | #include <net/checksum.h> |
dfd56b8b | 41 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
42 | #include <net/transp_v6.h> |
43 | #endif | |
35ebf65e | 44 | #include <net/ip_fib.h> |
1da177e4 LT |
45 | |
46 | #include <linux/errqueue.h> | |
47 | #include <asm/uaccess.h> | |
48 | ||
1da177e4 LT |
49 | /* |
50 | * SOL_IP control messages. | |
51 | */ | |
52 | ||
53 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
54 | { | |
d826eb14 | 55 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 56 | |
eddc9ec5 | 57 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
58 | |
59 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
60 | } | |
61 | ||
62 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
63 | { | |
eddc9ec5 | 64 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
65 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
66 | } | |
67 | ||
68 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
69 | { | |
eddc9ec5 | 70 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
71 | } |
72 | ||
73 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
74 | { | |
75 | if (IPCB(skb)->opt.optlen == 0) | |
76 | return; | |
77 | ||
eddc9ec5 ACM |
78 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
79 | ip_hdr(skb) + 1); | |
1da177e4 LT |
80 | } |
81 | ||
82 | ||
83 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
84 | { | |
85 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 86 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
87 | |
88 | if (IPCB(skb)->opt.optlen == 0) | |
89 | return; | |
90 | ||
91 | if (ip_options_echo(opt, skb)) { | |
92 | msg->msg_flags |= MSG_CTRUNC; | |
93 | return; | |
94 | } | |
95 | ip_options_undo(opt); | |
96 | ||
97 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
98 | } | |
99 | ||
ad6f939a TH |
100 | static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, |
101 | int offset) | |
102 | { | |
103 | __wsum csum = skb->csum; | |
104 | ||
105 | if (skb->ip_summed != CHECKSUM_COMPLETE) | |
106 | return; | |
107 | ||
108 | if (offset != 0) | |
31c2e492 WB |
109 | csum = csum_sub(csum, csum_partial(skb_transport_header(skb), |
110 | offset, 0)); | |
ad6f939a TH |
111 | |
112 | put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); | |
113 | } | |
114 | ||
2c7946a7 CZ |
115 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
116 | { | |
117 | char *secdata; | |
dc49c1f9 | 118 | u32 seclen, secid; |
2c7946a7 CZ |
119 | int err; |
120 | ||
dc49c1f9 CZ |
121 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
122 | if (err) | |
123 | return; | |
124 | ||
125 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
126 | if (err) |
127 | return; | |
128 | ||
129 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 130 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
131 | } |
132 | ||
21d1a161 | 133 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
134 | { |
135 | struct sockaddr_in sin; | |
b71d1d42 | 136 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 137 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
138 | |
139 | if (skb_transport_offset(skb) + 4 > skb->len) | |
140 | return; | |
141 | ||
142 | /* All current transport protocols have the port numbers in the | |
143 | * first four bytes of the transport header and this function is | |
144 | * written with this assumption in mind. | |
145 | */ | |
146 | ||
147 | sin.sin_family = AF_INET; | |
148 | sin.sin_addr.s_addr = iph->daddr; | |
149 | sin.sin_port = ports[1]; | |
150 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
151 | ||
152 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
153 | } | |
1da177e4 | 154 | |
5961de9f TH |
155 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, |
156 | int offset) | |
1da177e4 LT |
157 | { |
158 | struct inet_sock *inet = inet_sk(skb->sk); | |
95c96174 | 159 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
160 | |
161 | /* Ordered by supposed usage frequency */ | |
c44d13d6 | 162 | if (flags & IP_CMSG_PKTINFO) { |
1da177e4 | 163 | ip_cmsg_recv_pktinfo(msg, skb); |
1da177e4 | 164 | |
c44d13d6 TH |
165 | flags &= ~IP_CMSG_PKTINFO; |
166 | if (!flags) | |
167 | return; | |
168 | } | |
169 | ||
170 | if (flags & IP_CMSG_TTL) { | |
1da177e4 | 171 | ip_cmsg_recv_ttl(msg, skb); |
1da177e4 | 172 | |
c44d13d6 TH |
173 | flags &= ~IP_CMSG_TTL; |
174 | if (!flags) | |
175 | return; | |
176 | } | |
177 | ||
178 | if (flags & IP_CMSG_TOS) { | |
1da177e4 | 179 | ip_cmsg_recv_tos(msg, skb); |
1da177e4 | 180 | |
c44d13d6 TH |
181 | flags &= ~IP_CMSG_TOS; |
182 | if (!flags) | |
183 | return; | |
184 | } | |
185 | ||
186 | if (flags & IP_CMSG_RECVOPTS) { | |
1da177e4 | 187 | ip_cmsg_recv_opts(msg, skb); |
1da177e4 | 188 | |
c44d13d6 TH |
189 | flags &= ~IP_CMSG_RECVOPTS; |
190 | if (!flags) | |
191 | return; | |
192 | } | |
193 | ||
194 | if (flags & IP_CMSG_RETOPTS) { | |
1da177e4 | 195 | ip_cmsg_recv_retopts(msg, skb); |
2c7946a7 | 196 | |
c44d13d6 TH |
197 | flags &= ~IP_CMSG_RETOPTS; |
198 | if (!flags) | |
199 | return; | |
200 | } | |
201 | ||
202 | if (flags & IP_CMSG_PASSSEC) { | |
2c7946a7 | 203 | ip_cmsg_recv_security(msg, skb); |
e8b2dfe9 | 204 | |
c44d13d6 TH |
205 | flags &= ~IP_CMSG_PASSSEC; |
206 | if (!flags) | |
207 | return; | |
208 | } | |
209 | ||
ad6f939a | 210 | if (flags & IP_CMSG_ORIGDSTADDR) { |
e8b2dfe9 BS |
211 | ip_cmsg_recv_dstaddr(msg, skb); |
212 | ||
ad6f939a TH |
213 | flags &= ~IP_CMSG_ORIGDSTADDR; |
214 | if (!flags) | |
215 | return; | |
216 | } | |
217 | ||
218 | if (flags & IP_CMSG_CHECKSUM) | |
219 | ip_cmsg_recv_checksum(msg, skb, offset); | |
1da177e4 | 220 | } |
5961de9f | 221 | EXPORT_SYMBOL(ip_cmsg_recv_offset); |
1da177e4 | 222 | |
24025c46 | 223 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, |
c8e6ad08 | 224 | bool allow_ipv6) |
1da177e4 | 225 | { |
f02db315 | 226 | int err, val; |
1da177e4 | 227 | struct cmsghdr *cmsg; |
24025c46 | 228 | struct net *net = sock_net(sk); |
1da177e4 | 229 | |
f95b414e | 230 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
231 | if (!CMSG_OK(msg, cmsg)) |
232 | return -EINVAL; | |
5337b5b7 | 233 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
234 | if (allow_ipv6 && |
235 | cmsg->cmsg_level == SOL_IPV6 && | |
236 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
237 | struct in6_pktinfo *src_info; | |
238 | ||
239 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
240 | return -EINVAL; | |
241 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
242 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
243 | return -EINVAL; | |
244 | ipc->oif = src_info->ipi6_ifindex; | |
245 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; | |
246 | continue; | |
247 | } | |
248 | #endif | |
24025c46 | 249 | if (cmsg->cmsg_level == SOL_SOCKET) { |
2632616b ED |
250 | err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); |
251 | if (err) | |
252 | return err; | |
24025c46 SHY |
253 | continue; |
254 | } | |
255 | ||
1da177e4 LT |
256 | if (cmsg->cmsg_level != SOL_IP) |
257 | continue; | |
258 | switch (cmsg->cmsg_type) { | |
259 | case IP_RETOPTS: | |
260 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
91948309 ED |
261 | |
262 | /* Our caller is responsible for freeing ipc->opt */ | |
4d52cfbe ED |
263 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
264 | err < 40 ? err : 40); | |
1da177e4 LT |
265 | if (err) |
266 | return err; | |
267 | break; | |
268 | case IP_PKTINFO: | |
269 | { | |
270 | struct in_pktinfo *info; | |
271 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
272 | return -EINVAL; | |
273 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
274 | ipc->oif = info->ipi_ifindex; | |
275 | ipc->addr = info->ipi_spec_dst.s_addr; | |
276 | break; | |
277 | } | |
f02db315 FF |
278 | case IP_TTL: |
279 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
280 | return -EINVAL; | |
281 | val = *(int *)CMSG_DATA(cmsg); | |
282 | if (val < 1 || val > 255) | |
283 | return -EINVAL; | |
284 | ipc->ttl = val; | |
285 | break; | |
286 | case IP_TOS: | |
287 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
288 | return -EINVAL; | |
289 | val = *(int *)CMSG_DATA(cmsg); | |
290 | if (val < 0 || val > 255) | |
291 | return -EINVAL; | |
292 | ipc->tos = val; | |
293 | ipc->priority = rt_tos2priority(ipc->tos); | |
294 | break; | |
295 | ||
1da177e4 LT |
296 | default: |
297 | return -EINVAL; | |
298 | } | |
299 | } | |
300 | return 0; | |
301 | } | |
302 | ||
303 | ||
304 | /* Special input handler for packets caught by router alert option. | |
305 | They are selected only by protocol field, and then processed likely | |
306 | local ones; but only if someone wants them! Otherwise, router | |
307 | not running rsvpd will kill RSVP. | |
308 | ||
309 | It is user level problem, what it will make with them. | |
310 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
311 | but receiver should be enough clever f.e. to forward mtrace requests, | |
312 | sent to multicast group to reach destination designated router. | |
313 | */ | |
43a951e9 | 314 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
315 | static DEFINE_SPINLOCK(ip_ra_lock); |
316 | ||
592fcb9d ED |
317 | |
318 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 319 | { |
592fcb9d ED |
320 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
321 | ||
322 | sock_put(ra->saved_sk); | |
323 | kfree(ra); | |
66018506 | 324 | } |
1da177e4 | 325 | |
4d52cfbe ED |
326 | int ip_ra_control(struct sock *sk, unsigned char on, |
327 | void (*destructor)(struct sock *)) | |
1da177e4 | 328 | { |
43a951e9 ED |
329 | struct ip_ra_chain *ra, *new_ra; |
330 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 331 | |
c720c7e8 | 332 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
333 | return -EINVAL; |
334 | ||
335 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
336 | ||
66018506 | 337 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
338 | for (rap = &ip_ra_chain; |
339 | (ra = rcu_dereference_protected(*rap, | |
340 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
341 | rap = &ra->next) { | |
1da177e4 LT |
342 | if (ra->sk == sk) { |
343 | if (on) { | |
66018506 | 344 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 345 | kfree(new_ra); |
1da177e4 LT |
346 | return -EADDRINUSE; |
347 | } | |
592fcb9d ED |
348 | /* dont let ip_call_ra_chain() use sk again */ |
349 | ra->sk = NULL; | |
8e380f00 | 350 | RCU_INIT_POINTER(*rap, ra->next); |
66018506 | 351 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
352 | |
353 | if (ra->destructor) | |
354 | ra->destructor(sk); | |
592fcb9d ED |
355 | /* |
356 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
357 | * period. This guarantee ip_call_ra_chain() dont need | |
358 | * to mess with socket refcounts. | |
359 | */ | |
360 | ra->saved_sk = sk; | |
361 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
362 | return 0; |
363 | } | |
364 | } | |
51456b29 | 365 | if (!new_ra) { |
66018506 | 366 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
367 | return -ENOBUFS; |
368 | } | |
369 | new_ra->sk = sk; | |
370 | new_ra->destructor = destructor; | |
371 | ||
8e380f00 | 372 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 373 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 374 | sock_hold(sk); |
66018506 | 375 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
376 | |
377 | return 0; | |
378 | } | |
379 | ||
e905a9ed | 380 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 381 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 382 | { |
1da177e4 LT |
383 | struct sock_exterr_skb *serr; |
384 | ||
1da177e4 LT |
385 | skb = skb_clone(skb, GFP_ATOMIC); |
386 | if (!skb) | |
387 | return; | |
388 | ||
e905a9ed | 389 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
390 | serr->ee.ee_errno = err; |
391 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
392 | serr->ee.ee_type = icmp_hdr(skb)->type; |
393 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
394 | serr->ee.ee_pad = 0; |
395 | serr->ee.ee_info = info; | |
396 | serr->ee.ee_data = 0; | |
88c7664f | 397 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 398 | skb_network_header(skb); |
1da177e4 LT |
399 | serr->port = port; |
400 | ||
00db4124 | 401 | if (skb_pull(skb, payload - skb->data)) { |
bd82393c ACM |
402 | skb_reset_transport_header(skb); |
403 | if (sock_queue_err_skb(sk, skb) == 0) | |
404 | return; | |
405 | } | |
406 | kfree_skb(skb); | |
1da177e4 LT |
407 | } |
408 | ||
0579016e | 409 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
410 | { |
411 | struct inet_sock *inet = inet_sk(sk); | |
412 | struct sock_exterr_skb *serr; | |
413 | struct iphdr *iph; | |
414 | struct sk_buff *skb; | |
415 | ||
416 | if (!inet->recverr) | |
417 | return; | |
418 | ||
419 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
420 | if (!skb) | |
421 | return; | |
422 | ||
2ca9e6f2 ACM |
423 | skb_put(skb, sizeof(struct iphdr)); |
424 | skb_reset_network_header(skb); | |
eddc9ec5 | 425 | iph = ip_hdr(skb); |
1da177e4 LT |
426 | iph->daddr = daddr; |
427 | ||
e905a9ed | 428 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
429 | serr->ee.ee_errno = err; |
430 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 431 | serr->ee.ee_type = 0; |
1da177e4 LT |
432 | serr->ee.ee_code = 0; |
433 | serr->ee.ee_pad = 0; | |
434 | serr->ee.ee_info = info; | |
435 | serr->ee.ee_data = 0; | |
d56f90a7 | 436 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
437 | serr->port = port; |
438 | ||
27a884dc | 439 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 440 | skb_reset_transport_header(skb); |
1da177e4 LT |
441 | |
442 | if (sock_queue_err_skb(sk, skb)) | |
443 | kfree_skb(skb); | |
444 | } | |
445 | ||
34b99df4 JA |
446 | /* For some errors we have valid addr_offset even with zero payload and |
447 | * zero port. Also, addr_offset should be supported if port is set. | |
448 | */ | |
449 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
450 | { | |
451 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
452 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
453 | } | |
454 | ||
c247f053 WB |
455 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
456 | * | |
457 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
458 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
459 | */ | |
460 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
461 | struct sk_buff *skb, | |
462 | int ee_origin) | |
829ae9d6 | 463 | { |
c247f053 WB |
464 | struct in_pktinfo *info; |
465 | ||
466 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
467 | return true; | |
829ae9d6 | 468 | |
c247f053 WB |
469 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
470 | return false; | |
471 | ||
472 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
473 | * timestamp with egress dev. Not possible for packets without dev | |
474 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). | |
475 | */ | |
476 | if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || | |
829ae9d6 WB |
477 | (!skb->dev)) |
478 | return false; | |
479 | ||
c247f053 | 480 | info = PKTINFO_SKB_CB(skb); |
829ae9d6 WB |
481 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; |
482 | info->ipi_ifindex = skb->dev->ifindex; | |
483 | return true; | |
484 | } | |
485 | ||
e905a9ed | 486 | /* |
1da177e4 LT |
487 | * Handle MSG_ERRQUEUE |
488 | */ | |
85fbaa75 | 489 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
490 | { |
491 | struct sock_exterr_skb *serr; | |
364a9e93 | 492 | struct sk_buff *skb; |
342dfc30 | 493 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
494 | struct { |
495 | struct sock_extended_err ee; | |
496 | struct sockaddr_in offender; | |
497 | } errhdr; | |
498 | int err; | |
499 | int copied; | |
500 | ||
7ce875e5 WB |
501 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
502 | ||
1da177e4 | 503 | err = -EAGAIN; |
364a9e93 | 504 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 505 | if (!skb) |
1da177e4 LT |
506 | goto out; |
507 | ||
508 | copied = skb->len; | |
509 | if (copied > len) { | |
510 | msg->msg_flags |= MSG_TRUNC; | |
511 | copied = len; | |
512 | } | |
51f3d02b | 513 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
514 | if (unlikely(err)) { |
515 | kfree_skb(skb); | |
516 | return err; | |
517 | } | |
1da177e4 LT |
518 | sock_recv_timestamp(msg, sk, skb); |
519 | ||
520 | serr = SKB_EXT_ERR(skb); | |
521 | ||
34b99df4 | 522 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 523 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
524 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
525 | serr->addr_offset); | |
1da177e4 LT |
526 | sin->sin_port = serr->port; |
527 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 528 | *addr_len = sizeof(*sin); |
1da177e4 LT |
529 | } |
530 | ||
531 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
532 | sin = &errhdr.offender; | |
f812116b | 533 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 534 | |
c247f053 | 535 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 536 | sin->sin_family = AF_INET; |
eddc9ec5 | 537 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 538 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
539 | ip_cmsg_recv(msg, skb); |
540 | } | |
541 | ||
542 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
543 | ||
544 | /* Now we could try to dump offended packet options */ | |
545 | ||
546 | msg->msg_flags |= MSG_ERRQUEUE; | |
547 | err = copied; | |
548 | ||
960a2628 | 549 | consume_skb(skb); |
1da177e4 LT |
550 | out: |
551 | return err; | |
552 | } | |
553 | ||
554 | ||
555 | /* | |
4d52cfbe ED |
556 | * Socket option code for IP. This is the end of the line after any |
557 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 558 | */ |
baf606d9 MRL |
559 | static bool setsockopt_needs_rtnl(int optname) |
560 | { | |
561 | switch (optname) { | |
562 | case IP_ADD_MEMBERSHIP: | |
563 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 564 | case IP_BLOCK_SOURCE: |
baf606d9 | 565 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
566 | case IP_DROP_SOURCE_MEMBERSHIP: |
567 | case IP_MSFILTER: | |
568 | case IP_UNBLOCK_SOURCE: | |
569 | case MCAST_BLOCK_SOURCE: | |
570 | case MCAST_MSFILTER: | |
baf606d9 | 571 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 572 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 573 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
574 | case MCAST_LEAVE_SOURCE_GROUP: |
575 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
576 | return true; |
577 | } | |
578 | return false; | |
579 | } | |
1da177e4 | 580 | |
3fdadf7d | 581 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 582 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
583 | { |
584 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 585 | struct net *net = sock_net(sk); |
09cb105e | 586 | int val = 0, err; |
baf606d9 | 587 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 588 | |
0c9f79be XW |
589 | switch (optname) { |
590 | case IP_PKTINFO: | |
591 | case IP_RECVTTL: | |
592 | case IP_RECVOPTS: | |
593 | case IP_RECVTOS: | |
594 | case IP_RETOPTS: | |
595 | case IP_TOS: | |
596 | case IP_TTL: | |
597 | case IP_HDRINCL: | |
598 | case IP_MTU_DISCOVER: | |
599 | case IP_RECVERR: | |
600 | case IP_ROUTER_ALERT: | |
601 | case IP_FREEBIND: | |
602 | case IP_PASSSEC: | |
603 | case IP_TRANSPARENT: | |
604 | case IP_MINTTL: | |
605 | case IP_NODEFRAG: | |
90c337da | 606 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
607 | case IP_UNICAST_IF: |
608 | case IP_MULTICAST_TTL: | |
609 | case IP_MULTICAST_ALL: | |
610 | case IP_MULTICAST_LOOP: | |
611 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 612 | case IP_CHECKSUM: |
1da177e4 LT |
613 | if (optlen >= sizeof(int)) { |
614 | if (get_user(val, (int __user *) optval)) | |
615 | return -EFAULT; | |
616 | } else if (optlen >= sizeof(char)) { | |
617 | unsigned char ucval; | |
618 | ||
619 | if (get_user(ucval, (unsigned char __user *) optval)) | |
620 | return -EFAULT; | |
621 | val = (int) ucval; | |
622 | } | |
623 | } | |
624 | ||
625 | /* If optlen==0, it is equivalent to val == 0 */ | |
626 | ||
6a9fb947 | 627 | if (ip_mroute_opt(optname)) |
09cb105e | 628 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
629 | |
630 | err = 0; | |
baf606d9 MRL |
631 | if (needs_rtnl) |
632 | rtnl_lock(); | |
1da177e4 LT |
633 | lock_sock(sk); |
634 | ||
635 | switch (optname) { | |
132adf54 SH |
636 | case IP_OPTIONS: |
637 | { | |
f6d8bd05 ED |
638 | struct ip_options_rcu *old, *opt = NULL; |
639 | ||
65a1c4ff | 640 | if (optlen > 40) |
132adf54 | 641 | goto e_inval; |
3b1e0a65 | 642 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 643 | optval, optlen); |
132adf54 SH |
644 | if (err) |
645 | break; | |
f6d8bd05 | 646 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 647 | lockdep_sock_is_held(sk)); |
132adf54 SH |
648 | if (inet->is_icsk) { |
649 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 650 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
651 | if (sk->sk_family == PF_INET || |
652 | (!((1 << sk->sk_state) & | |
653 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 654 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 655 | #endif |
f6d8bd05 ED |
656 | if (old) |
657 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 658 | if (opt) |
f6d8bd05 | 659 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 660 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 661 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 662 | } |
132adf54 | 663 | #endif |
1da177e4 | 664 | } |
f6d8bd05 ED |
665 | rcu_assign_pointer(inet->inet_opt, opt); |
666 | if (old) | |
605b4afe | 667 | kfree_rcu(old, rcu); |
132adf54 SH |
668 | break; |
669 | } | |
670 | case IP_PKTINFO: | |
671 | if (val) | |
672 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
673 | else | |
674 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
675 | break; | |
676 | case IP_RECVTTL: | |
677 | if (val) | |
678 | inet->cmsg_flags |= IP_CMSG_TTL; | |
679 | else | |
680 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
681 | break; | |
682 | case IP_RECVTOS: | |
683 | if (val) | |
684 | inet->cmsg_flags |= IP_CMSG_TOS; | |
685 | else | |
686 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
687 | break; | |
688 | case IP_RECVOPTS: | |
689 | if (val) | |
690 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
691 | else | |
692 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
693 | break; | |
694 | case IP_RETOPTS: | |
695 | if (val) | |
696 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
697 | else | |
698 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
699 | break; | |
700 | case IP_PASSSEC: | |
701 | if (val) | |
702 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
703 | else | |
704 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
705 | break; | |
e8b2dfe9 BS |
706 | case IP_RECVORIGDSTADDR: |
707 | if (val) | |
708 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
709 | else | |
710 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
711 | break; | |
ad6f939a TH |
712 | case IP_CHECKSUM: |
713 | if (val) { | |
714 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
715 | inet_inc_convert_csum(sk); | |
716 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
717 | } | |
718 | } else { | |
719 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
720 | inet_dec_convert_csum(sk); | |
721 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
722 | } | |
723 | } | |
724 | break; | |
132adf54 SH |
725 | case IP_TOS: /* This sets both TOS and Precedence */ |
726 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
727 | val &= ~INET_ECN_MASK; |
728 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 729 | } |
132adf54 SH |
730 | if (inet->tos != val) { |
731 | inet->tos = val; | |
732 | sk->sk_priority = rt_tos2priority(val); | |
733 | sk_dst_reset(sk); | |
734 | } | |
735 | break; | |
736 | case IP_TTL: | |
4d52cfbe | 737 | if (optlen < 1) |
132adf54 | 738 | goto e_inval; |
c9be4a5c | 739 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
740 | goto e_inval; |
741 | inet->uc_ttl = val; | |
742 | break; | |
743 | case IP_HDRINCL: | |
744 | if (sk->sk_type != SOCK_RAW) { | |
745 | err = -ENOPROTOOPT; | |
2c7946a7 | 746 | break; |
132adf54 SH |
747 | } |
748 | inet->hdrincl = val ? 1 : 0; | |
749 | break; | |
7b2ff18e JO |
750 | case IP_NODEFRAG: |
751 | if (sk->sk_type != SOCK_RAW) { | |
752 | err = -ENOPROTOOPT; | |
753 | break; | |
754 | } | |
755 | inet->nodefrag = val ? 1 : 0; | |
756 | break; | |
90c337da ED |
757 | case IP_BIND_ADDRESS_NO_PORT: |
758 | inet->bind_address_no_port = val ? 1 : 0; | |
759 | break; | |
132adf54 | 760 | case IP_MTU_DISCOVER: |
1b346576 | 761 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
762 | goto e_inval; |
763 | inet->pmtudisc = val; | |
764 | break; | |
765 | case IP_RECVERR: | |
766 | inet->recverr = !!val; | |
767 | if (!val) | |
768 | skb_queue_purge(&sk->sk_error_queue); | |
769 | break; | |
770 | case IP_MULTICAST_TTL: | |
771 | if (sk->sk_type == SOCK_STREAM) | |
772 | goto e_inval; | |
4d52cfbe | 773 | if (optlen < 1) |
132adf54 | 774 | goto e_inval; |
09cb105e | 775 | if (val == -1) |
132adf54 SH |
776 | val = 1; |
777 | if (val < 0 || val > 255) | |
778 | goto e_inval; | |
779 | inet->mc_ttl = val; | |
780 | break; | |
781 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 782 | if (optlen < 1) |
132adf54 SH |
783 | goto e_inval; |
784 | inet->mc_loop = !!val; | |
785 | break; | |
76e21053 EH |
786 | case IP_UNICAST_IF: |
787 | { | |
788 | struct net_device *dev = NULL; | |
789 | int ifindex; | |
790 | ||
791 | if (optlen != sizeof(int)) | |
792 | goto e_inval; | |
793 | ||
794 | ifindex = (__force int)ntohl((__force __be32)val); | |
795 | if (ifindex == 0) { | |
796 | inet->uc_index = 0; | |
797 | err = 0; | |
798 | break; | |
799 | } | |
800 | ||
801 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
802 | err = -EADDRNOTAVAIL; | |
803 | if (!dev) | |
804 | break; | |
805 | dev_put(dev); | |
806 | ||
807 | err = -EINVAL; | |
808 | if (sk->sk_bound_dev_if) | |
809 | break; | |
810 | ||
811 | inet->uc_index = ifindex; | |
812 | err = 0; | |
813 | break; | |
814 | } | |
132adf54 SH |
815 | case IP_MULTICAST_IF: |
816 | { | |
817 | struct ip_mreqn mreq; | |
818 | struct net_device *dev = NULL; | |
819 | ||
820 | if (sk->sk_type == SOCK_STREAM) | |
821 | goto e_inval; | |
822 | /* | |
823 | * Check the arguments are allowable | |
824 | */ | |
825 | ||
0915921b SW |
826 | if (optlen < sizeof(struct in_addr)) |
827 | goto e_inval; | |
828 | ||
132adf54 SH |
829 | err = -EFAULT; |
830 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 831 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 832 | break; |
132adf54 SH |
833 | } else { |
834 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
835 | if (optlen >= sizeof(struct ip_mreq)) { |
836 | if (copy_from_user(&mreq, optval, | |
837 | sizeof(struct ip_mreq))) | |
838 | break; | |
839 | } else if (optlen >= sizeof(struct in_addr)) { | |
840 | if (copy_from_user(&mreq.imr_address, optval, | |
841 | sizeof(struct in_addr))) | |
842 | break; | |
843 | } | |
132adf54 SH |
844 | } |
845 | ||
846 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 847 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
848 | inet->mc_index = 0; |
849 | inet->mc_addr = 0; | |
850 | err = 0; | |
1da177e4 LT |
851 | break; |
852 | } | |
3b1e0a65 | 853 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 854 | if (dev) |
132adf54 | 855 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 856 | } else |
55b80503 | 857 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 858 | |
1da177e4 | 859 | |
132adf54 SH |
860 | err = -EADDRNOTAVAIL; |
861 | if (!dev) | |
862 | break; | |
55b80503 | 863 | dev_put(dev); |
132adf54 SH |
864 | |
865 | err = -EINVAL; | |
866 | if (sk->sk_bound_dev_if && | |
867 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
868 | break; | |
1da177e4 | 869 | |
132adf54 SH |
870 | inet->mc_index = mreq.imr_ifindex; |
871 | inet->mc_addr = mreq.imr_address.s_addr; | |
872 | err = 0; | |
873 | break; | |
874 | } | |
1da177e4 | 875 | |
132adf54 SH |
876 | case IP_ADD_MEMBERSHIP: |
877 | case IP_DROP_MEMBERSHIP: | |
878 | { | |
879 | struct ip_mreqn mreq; | |
1da177e4 | 880 | |
a96fb49b FL |
881 | err = -EPROTO; |
882 | if (inet_sk(sk)->is_icsk) | |
883 | break; | |
884 | ||
132adf54 SH |
885 | if (optlen < sizeof(struct ip_mreq)) |
886 | goto e_inval; | |
887 | err = -EFAULT; | |
888 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 889 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 890 | break; |
132adf54 SH |
891 | } else { |
892 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 893 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 894 | break; |
132adf54 | 895 | } |
1da177e4 | 896 | |
132adf54 | 897 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 898 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 899 | else |
54ff9ef3 | 900 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
901 | break; |
902 | } | |
903 | case IP_MSFILTER: | |
904 | { | |
132adf54 SH |
905 | struct ip_msfilter *msf; |
906 | ||
907 | if (optlen < IP_MSFILTER_SIZE(0)) | |
908 | goto e_inval; | |
909 | if (optlen > sysctl_optmem_max) { | |
910 | err = -ENOBUFS; | |
1da177e4 LT |
911 | break; |
912 | } | |
132adf54 | 913 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 914 | if (!msf) { |
132adf54 SH |
915 | err = -ENOBUFS; |
916 | break; | |
917 | } | |
918 | err = -EFAULT; | |
919 | if (copy_from_user(msf, optval, optlen)) { | |
920 | kfree(msf); | |
921 | break; | |
922 | } | |
923 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
924 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 925 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
926 | kfree(msf); |
927 | err = -ENOBUFS; | |
928 | break; | |
929 | } | |
930 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
931 | kfree(msf); | |
932 | err = -EINVAL; | |
933 | break; | |
934 | } | |
935 | err = ip_mc_msfilter(sk, msf, 0); | |
936 | kfree(msf); | |
937 | break; | |
938 | } | |
939 | case IP_BLOCK_SOURCE: | |
940 | case IP_UNBLOCK_SOURCE: | |
941 | case IP_ADD_SOURCE_MEMBERSHIP: | |
942 | case IP_DROP_SOURCE_MEMBERSHIP: | |
943 | { | |
944 | struct ip_mreq_source mreqs; | |
945 | int omode, add; | |
1da177e4 | 946 | |
132adf54 SH |
947 | if (optlen != sizeof(struct ip_mreq_source)) |
948 | goto e_inval; | |
949 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 950 | err = -EFAULT; |
1da177e4 LT |
951 | break; |
952 | } | |
132adf54 SH |
953 | if (optname == IP_BLOCK_SOURCE) { |
954 | omode = MCAST_EXCLUDE; | |
955 | add = 1; | |
956 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
957 | omode = MCAST_EXCLUDE; | |
958 | add = 0; | |
959 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
960 | struct ip_mreqn mreq; | |
1da177e4 | 961 | |
132adf54 SH |
962 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
963 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
964 | mreq.imr_ifindex = 0; | |
54ff9ef3 | 965 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 966 | if (err && err != -EADDRINUSE) |
1da177e4 | 967 | break; |
132adf54 SH |
968 | omode = MCAST_INCLUDE; |
969 | add = 1; | |
970 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
971 | omode = MCAST_INCLUDE; | |
972 | add = 0; | |
973 | } | |
974 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
975 | break; | |
976 | } | |
977 | case MCAST_JOIN_GROUP: | |
978 | case MCAST_LEAVE_GROUP: | |
979 | { | |
980 | struct group_req greq; | |
981 | struct sockaddr_in *psin; | |
982 | struct ip_mreqn mreq; | |
983 | ||
984 | if (optlen < sizeof(struct group_req)) | |
985 | goto e_inval; | |
986 | err = -EFAULT; | |
987 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
988 | break; | |
989 | psin = (struct sockaddr_in *)&greq.gr_group; | |
990 | if (psin->sin_family != AF_INET) | |
991 | goto e_inval; | |
992 | memset(&mreq, 0, sizeof(mreq)); | |
993 | mreq.imr_multiaddr = psin->sin_addr; | |
994 | mreq.imr_ifindex = greq.gr_interface; | |
995 | ||
996 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 997 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 998 | else |
54ff9ef3 | 999 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1000 | break; |
1001 | } | |
1002 | case MCAST_JOIN_SOURCE_GROUP: | |
1003 | case MCAST_LEAVE_SOURCE_GROUP: | |
1004 | case MCAST_BLOCK_SOURCE: | |
1005 | case MCAST_UNBLOCK_SOURCE: | |
1006 | { | |
1007 | struct group_source_req greqs; | |
1008 | struct ip_mreq_source mreqs; | |
1009 | struct sockaddr_in *psin; | |
1010 | int omode, add; | |
1011 | ||
1012 | if (optlen != sizeof(struct group_source_req)) | |
1013 | goto e_inval; | |
1014 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1015 | err = -EFAULT; |
1da177e4 LT |
1016 | break; |
1017 | } | |
132adf54 SH |
1018 | if (greqs.gsr_group.ss_family != AF_INET || |
1019 | greqs.gsr_source.ss_family != AF_INET) { | |
1020 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1021 | break; |
1022 | } | |
132adf54 SH |
1023 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1024 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1025 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1026 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1027 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1028 | ||
1029 | if (optname == MCAST_BLOCK_SOURCE) { | |
1030 | omode = MCAST_EXCLUDE; | |
1031 | add = 1; | |
1032 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1033 | omode = MCAST_EXCLUDE; | |
1034 | add = 0; | |
1035 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1036 | struct ip_mreqn mreq; |
1037 | ||
132adf54 | 1038 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1039 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1040 | mreq.imr_address.s_addr = 0; |
1041 | mreq.imr_ifindex = greqs.gsr_interface; | |
54ff9ef3 | 1042 | err = ip_mc_join_group(sk, &mreq); |
132adf54 SH |
1043 | if (err && err != -EADDRINUSE) |
1044 | break; | |
1045 | greqs.gsr_interface = mreq.imr_ifindex; | |
1046 | omode = MCAST_INCLUDE; | |
1047 | add = 1; | |
1048 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1049 | omode = MCAST_INCLUDE; | |
1050 | add = 0; | |
1051 | } | |
1052 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1053 | greqs.gsr_interface); | |
1054 | break; | |
1055 | } | |
1056 | case MCAST_MSFILTER: | |
1057 | { | |
132adf54 SH |
1058 | struct sockaddr_in *psin; |
1059 | struct ip_msfilter *msf = NULL; | |
1060 | struct group_filter *gsf = NULL; | |
1061 | int msize, i, ifindex; | |
1062 | ||
1063 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1064 | goto e_inval; | |
1065 | if (optlen > sysctl_optmem_max) { | |
1066 | err = -ENOBUFS; | |
1da177e4 LT |
1067 | break; |
1068 | } | |
09cb105e | 1069 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 1070 | if (!gsf) { |
132adf54 | 1071 | err = -ENOBUFS; |
1da177e4 LT |
1072 | break; |
1073 | } | |
132adf54 | 1074 | err = -EFAULT; |
4d52cfbe | 1075 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 1076 | goto mc_msf_out; |
4d52cfbe | 1077 | |
132adf54 SH |
1078 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1079 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1080 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1081 | err = -ENOBUFS; |
1082 | goto mc_msf_out; | |
1083 | } | |
1084 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1085 | err = -EINVAL; | |
1086 | goto mc_msf_out; | |
1087 | } | |
1088 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1089 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1090 | if (!msf) { |
132adf54 SH |
1091 | err = -ENOBUFS; |
1092 | goto mc_msf_out; | |
1093 | } | |
1094 | ifindex = gsf->gf_interface; | |
1095 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1096 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1097 | err = -EADDRNOTAVAIL; |
132adf54 | 1098 | goto mc_msf_out; |
1da177e4 | 1099 | } |
132adf54 SH |
1100 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1101 | msf->imsf_interface = 0; | |
1102 | msf->imsf_fmode = gsf->gf_fmode; | |
1103 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1104 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1105 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1106 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1107 | |
132adf54 SH |
1108 | if (psin->sin_family != AF_INET) |
1109 | goto mc_msf_out; | |
1110 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1111 | } | |
1112 | kfree(gsf); | |
1113 | gsf = NULL; | |
1114 | ||
1115 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1116 | mc_msf_out: |
132adf54 SH |
1117 | kfree(msf); |
1118 | kfree(gsf); | |
1119 | break; | |
1120 | } | |
f771bef9 NS |
1121 | case IP_MULTICAST_ALL: |
1122 | if (optlen < 1) | |
1123 | goto e_inval; | |
1124 | if (val != 0 && val != 1) | |
1125 | goto e_inval; | |
1126 | inet->mc_all = val; | |
1127 | break; | |
132adf54 SH |
1128 | case IP_ROUTER_ALERT: |
1129 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1130 | break; | |
1131 | ||
1132 | case IP_FREEBIND: | |
4d52cfbe | 1133 | if (optlen < 1) |
132adf54 SH |
1134 | goto e_inval; |
1135 | inet->freebind = !!val; | |
1136 | break; | |
1137 | ||
1138 | case IP_IPSEC_POLICY: | |
1139 | case IP_XFRM_POLICY: | |
1140 | err = -EPERM; | |
52e804c6 | 1141 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1142 | break; |
132adf54 SH |
1143 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1144 | break; | |
1da177e4 | 1145 | |
f5715aea | 1146 | case IP_TRANSPARENT: |
52e804c6 EB |
1147 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1148 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1149 | err = -EPERM; |
1150 | break; | |
1151 | } | |
1152 | if (optlen < 1) | |
1153 | goto e_inval; | |
1154 | inet->transparent = !!val; | |
1155 | break; | |
1156 | ||
d218d111 SH |
1157 | case IP_MINTTL: |
1158 | if (optlen < 1) | |
1159 | goto e_inval; | |
1160 | if (val < 0 || val > 255) | |
1161 | goto e_inval; | |
1162 | inet->min_ttl = val; | |
1163 | break; | |
1164 | ||
132adf54 SH |
1165 | default: |
1166 | err = -ENOPROTOOPT; | |
1167 | break; | |
1da177e4 LT |
1168 | } |
1169 | release_sock(sk); | |
baf606d9 MRL |
1170 | if (needs_rtnl) |
1171 | rtnl_unlock(); | |
1da177e4 LT |
1172 | return err; |
1173 | ||
1174 | e_inval: | |
1175 | release_sock(sk); | |
baf606d9 MRL |
1176 | if (needs_rtnl) |
1177 | rtnl_unlock(); | |
1da177e4 LT |
1178 | return -EINVAL; |
1179 | } | |
1180 | ||
f84af32c | 1181 | /** |
829ae9d6 | 1182 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1183 | * @sk: socket |
1184 | * @skb: buffer | |
1185 | * | |
35ebf65e DM |
1186 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1187 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1188 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1189 | */ |
fbf8866d | 1190 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1191 | { |
d826eb14 | 1192 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1193 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1194 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1195 | |
4b261c75 | 1196 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1197 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1198 | * which has interface index (iif) as the first member of the | |
1199 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1200 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
1201 | * element so the iif is picked up from the prior IPCB | |
1202 | */ | |
35ebf65e | 1203 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1204 | } else { |
1205 | pktinfo->ipi_ifindex = 0; | |
1206 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1207 | } | |
1208 | skb_dst_drop(skb); | |
f84af32c | 1209 | } |
f84af32c | 1210 | |
3fdadf7d | 1211 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1212 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1213 | { |
1214 | int err; | |
1215 | ||
1216 | if (level != SOL_IP) | |
1217 | return -ENOPROTOOPT; | |
1218 | ||
1219 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1220 | #ifdef CONFIG_NETFILTER | |
1221 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1222 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1223 | optname != IP_IPSEC_POLICY && |
1224 | optname != IP_XFRM_POLICY && | |
1225 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1226 | lock_sock(sk); |
1227 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1228 | release_sock(sk); | |
1229 | } | |
1230 | #endif | |
1231 | return err; | |
1232 | } | |
4d52cfbe | 1233 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1234 | |
1235 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1236 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1237 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1238 | { |
1239 | int err; | |
1240 | ||
1241 | if (level != SOL_IP) | |
1242 | return -ENOPROTOOPT; | |
1243 | ||
dae50295 DS |
1244 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1245 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1246 | ip_setsockopt); | |
1247 | ||
3fdadf7d DM |
1248 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1249 | #ifdef CONFIG_NETFILTER | |
1250 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1251 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1252 | optname != IP_IPSEC_POLICY && |
1253 | optname != IP_XFRM_POLICY && | |
1254 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1255 | lock_sock(sk); |
543d9cfe ACM |
1256 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1257 | optval, optlen); | |
3fdadf7d DM |
1258 | release_sock(sk); |
1259 | } | |
1260 | #endif | |
1261 | return err; | |
1262 | } | |
543d9cfe | 1263 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1264 | #endif |
1265 | ||
1da177e4 | 1266 | /* |
4d52cfbe ED |
1267 | * Get the options. Note for future reference. The GET of IP options gets |
1268 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1269 | */ |
1270 | ||
87e9f031 WC |
1271 | static bool getsockopt_needs_rtnl(int optname) |
1272 | { | |
1273 | switch (optname) { | |
1274 | case IP_MSFILTER: | |
1275 | case MCAST_MSFILTER: | |
1276 | return true; | |
1277 | } | |
1278 | return false; | |
1279 | } | |
1280 | ||
3fdadf7d | 1281 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1282 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1283 | { |
1284 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1285 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1286 | int val, err = 0; | |
1da177e4 | 1287 | int len; |
e905a9ed | 1288 | |
132adf54 | 1289 | if (level != SOL_IP) |
1da177e4 LT |
1290 | return -EOPNOTSUPP; |
1291 | ||
6a9fb947 | 1292 | if (ip_mroute_opt(optname)) |
09cb105e | 1293 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1294 | |
09cb105e | 1295 | if (get_user(len, optlen)) |
1da177e4 | 1296 | return -EFAULT; |
132adf54 | 1297 | if (len < 0) |
1da177e4 | 1298 | return -EINVAL; |
e905a9ed | 1299 | |
87e9f031 WC |
1300 | if (needs_rtnl) |
1301 | rtnl_lock(); | |
1da177e4 LT |
1302 | lock_sock(sk); |
1303 | ||
132adf54 SH |
1304 | switch (optname) { |
1305 | case IP_OPTIONS: | |
1306 | { | |
1307 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1308 | struct ip_options *opt = (struct ip_options *)optbuf; |
1309 | struct ip_options_rcu *inet_opt; | |
1310 | ||
1311 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1312 | lockdep_sock_is_held(sk)); |
132adf54 | 1313 | opt->optlen = 0; |
f6d8bd05 ED |
1314 | if (inet_opt) |
1315 | memcpy(optbuf, &inet_opt->opt, | |
1316 | sizeof(struct ip_options) + | |
1317 | inet_opt->opt.optlen); | |
132adf54 SH |
1318 | release_sock(sk); |
1319 | ||
1320 | if (opt->optlen == 0) | |
1321 | return put_user(0, optlen); | |
1322 | ||
1323 | ip_options_undo(opt); | |
1324 | ||
1325 | len = min_t(unsigned int, len, opt->optlen); | |
1326 | if (put_user(len, optlen)) | |
1327 | return -EFAULT; | |
1328 | if (copy_to_user(optval, opt->__data, len)) | |
1329 | return -EFAULT; | |
1330 | return 0; | |
1331 | } | |
1332 | case IP_PKTINFO: | |
1333 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1334 | break; | |
1335 | case IP_RECVTTL: | |
1336 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1337 | break; | |
1338 | case IP_RECVTOS: | |
1339 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1340 | break; | |
1341 | case IP_RECVOPTS: | |
1342 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1343 | break; | |
1344 | case IP_RETOPTS: | |
1345 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1346 | break; | |
1347 | case IP_PASSSEC: | |
1348 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1349 | break; | |
e8b2dfe9 BS |
1350 | case IP_RECVORIGDSTADDR: |
1351 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1352 | break; | |
ad6f939a TH |
1353 | case IP_CHECKSUM: |
1354 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1355 | break; | |
132adf54 SH |
1356 | case IP_TOS: |
1357 | val = inet->tos; | |
1358 | break; | |
1359 | case IP_TTL: | |
fa50d974 NB |
1360 | { |
1361 | struct net *net = sock_net(sk); | |
132adf54 | 1362 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1363 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1364 | inet->uc_ttl); |
1365 | break; | |
fa50d974 | 1366 | } |
132adf54 SH |
1367 | case IP_HDRINCL: |
1368 | val = inet->hdrincl; | |
1369 | break; | |
a89b4763 MK |
1370 | case IP_NODEFRAG: |
1371 | val = inet->nodefrag; | |
1372 | break; | |
90c337da ED |
1373 | case IP_BIND_ADDRESS_NO_PORT: |
1374 | val = inet->bind_address_no_port; | |
1375 | break; | |
132adf54 SH |
1376 | case IP_MTU_DISCOVER: |
1377 | val = inet->pmtudisc; | |
1378 | break; | |
1379 | case IP_MTU: | |
1380 | { | |
1381 | struct dst_entry *dst; | |
1382 | val = 0; | |
1383 | dst = sk_dst_get(sk); | |
1384 | if (dst) { | |
1385 | val = dst_mtu(dst); | |
1386 | dst_release(dst); | |
1da177e4 | 1387 | } |
132adf54 | 1388 | if (!val) { |
1da177e4 | 1389 | release_sock(sk); |
132adf54 | 1390 | return -ENOTCONN; |
1da177e4 | 1391 | } |
132adf54 SH |
1392 | break; |
1393 | } | |
1394 | case IP_RECVERR: | |
1395 | val = inet->recverr; | |
1396 | break; | |
1397 | case IP_MULTICAST_TTL: | |
1398 | val = inet->mc_ttl; | |
1399 | break; | |
1400 | case IP_MULTICAST_LOOP: | |
1401 | val = inet->mc_loop; | |
1402 | break; | |
76e21053 EH |
1403 | case IP_UNICAST_IF: |
1404 | val = (__force int)htonl((__u32) inet->uc_index); | |
1405 | break; | |
132adf54 SH |
1406 | case IP_MULTICAST_IF: |
1407 | { | |
1408 | struct in_addr addr; | |
1409 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1410 | addr.s_addr = inet->mc_addr; | |
1411 | release_sock(sk); | |
1da177e4 | 1412 | |
132adf54 SH |
1413 | if (put_user(len, optlen)) |
1414 | return -EFAULT; | |
1415 | if (copy_to_user(optval, &addr, len)) | |
1416 | return -EFAULT; | |
1417 | return 0; | |
1418 | } | |
1419 | case IP_MSFILTER: | |
1420 | { | |
1421 | struct ip_msfilter msf; | |
132adf54 SH |
1422 | |
1423 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1424 | err = -EINVAL; |
1425 | goto out; | |
1da177e4 | 1426 | } |
132adf54 | 1427 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1428 | err = -EFAULT; |
1429 | goto out; | |
1da177e4 | 1430 | } |
132adf54 SH |
1431 | err = ip_mc_msfget(sk, &msf, |
1432 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1433 | goto out; |
132adf54 SH |
1434 | } |
1435 | case MCAST_MSFILTER: | |
1436 | { | |
1437 | struct group_filter gsf; | |
1da177e4 | 1438 | |
132adf54 | 1439 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1440 | err = -EINVAL; |
1441 | goto out; | |
132adf54 SH |
1442 | } |
1443 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1444 | err = -EFAULT; |
1445 | goto out; | |
132adf54 SH |
1446 | } |
1447 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1448 | (struct group_filter __user *)optval, |
1449 | optlen); | |
87e9f031 | 1450 | goto out; |
132adf54 | 1451 | } |
f771bef9 NS |
1452 | case IP_MULTICAST_ALL: |
1453 | val = inet->mc_all; | |
1454 | break; | |
132adf54 SH |
1455 | case IP_PKTOPTIONS: |
1456 | { | |
1457 | struct msghdr msg; | |
1da177e4 | 1458 | |
132adf54 | 1459 | release_sock(sk); |
1da177e4 | 1460 | |
132adf54 SH |
1461 | if (sk->sk_type != SOCK_STREAM) |
1462 | return -ENOPROTOOPT; | |
1da177e4 | 1463 | |
c54a5e02 | 1464 | msg.msg_control = (__force void *) optval; |
132adf54 | 1465 | msg.msg_controllen = len; |
dd23198e | 1466 | msg.msg_flags = flags; |
1da177e4 | 1467 | |
132adf54 SH |
1468 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1469 | struct in_pktinfo info; | |
1470 | ||
c720c7e8 ED |
1471 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1472 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1473 | info.ipi_ifindex = inet->mc_index; |
1474 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1475 | } |
132adf54 SH |
1476 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1477 | int hlim = inet->mc_ttl; | |
1478 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1479 | } | |
4c507d28 JB |
1480 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1481 | int tos = inet->rcv_tos; | |
1482 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1483 | } | |
132adf54 SH |
1484 | len -= msg.msg_controllen; |
1485 | return put_user(len, optlen); | |
1486 | } | |
1487 | case IP_FREEBIND: | |
1488 | val = inet->freebind; | |
1489 | break; | |
f5715aea KK |
1490 | case IP_TRANSPARENT: |
1491 | val = inet->transparent; | |
1492 | break; | |
d218d111 SH |
1493 | case IP_MINTTL: |
1494 | val = inet->min_ttl; | |
1495 | break; | |
132adf54 SH |
1496 | default: |
1497 | release_sock(sk); | |
1498 | return -ENOPROTOOPT; | |
1da177e4 LT |
1499 | } |
1500 | release_sock(sk); | |
e905a9ed | 1501 | |
4d52cfbe | 1502 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1503 | unsigned char ucval = (unsigned char)val; |
1504 | len = 1; | |
132adf54 | 1505 | if (put_user(len, optlen)) |
1da177e4 | 1506 | return -EFAULT; |
09cb105e | 1507 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1508 | return -EFAULT; |
1509 | } else { | |
1510 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1511 | if (put_user(len, optlen)) |
1da177e4 | 1512 | return -EFAULT; |
09cb105e | 1513 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1514 | return -EFAULT; |
1515 | } | |
1516 | return 0; | |
87e9f031 WC |
1517 | |
1518 | out: | |
1519 | release_sock(sk); | |
1520 | if (needs_rtnl) | |
1521 | rtnl_unlock(); | |
1522 | return err; | |
1da177e4 LT |
1523 | } |
1524 | ||
3fdadf7d | 1525 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1526 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1527 | { |
1528 | int err; | |
1529 | ||
dd23198e | 1530 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1531 | #ifdef CONFIG_NETFILTER |
1532 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1533 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1534 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1535 | int len; |
3fdadf7d | 1536 | |
09cb105e | 1537 | if (get_user(len, optlen)) |
3fdadf7d DM |
1538 | return -EFAULT; |
1539 | ||
1540 | lock_sock(sk); | |
1541 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1542 | &len); | |
1543 | release_sock(sk); | |
1544 | if (err >= 0) | |
1545 | err = put_user(len, optlen); | |
1546 | return err; | |
1547 | } | |
1548 | #endif | |
1549 | return err; | |
1550 | } | |
4d52cfbe | 1551 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1552 | |
1553 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1554 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1555 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1556 | { |
42908c69 DS |
1557 | int err; |
1558 | ||
1559 | if (optname == MCAST_MSFILTER) | |
1560 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1561 | ip_getsockopt); | |
1562 | ||
dd23198e DB |
1563 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1564 | MSG_CMSG_COMPAT); | |
42908c69 | 1565 | |
3fdadf7d DM |
1566 | #ifdef CONFIG_NETFILTER |
1567 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1568 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1569 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1570 | int len; |
3fdadf7d | 1571 | |
543d9cfe | 1572 | if (get_user(len, optlen)) |
3fdadf7d DM |
1573 | return -EFAULT; |
1574 | ||
1575 | lock_sock(sk); | |
543d9cfe | 1576 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1577 | release_sock(sk); |
1578 | if (err >= 0) | |
1579 | err = put_user(len, optlen); | |
1580 | return err; | |
1581 | } | |
1582 | #endif | |
1583 | return err; | |
1584 | } | |
543d9cfe | 1585 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1586 | #endif |