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) | |
109 | csum = csum_sub(csum, csum_partial(skb->data, offset, 0)); | |
110 | ||
111 | put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); | |
112 | } | |
113 | ||
2c7946a7 CZ |
114 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
115 | { | |
116 | char *secdata; | |
dc49c1f9 | 117 | u32 seclen, secid; |
2c7946a7 CZ |
118 | int err; |
119 | ||
dc49c1f9 CZ |
120 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
121 | if (err) | |
122 | return; | |
123 | ||
124 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
125 | if (err) |
126 | return; | |
127 | ||
128 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 129 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
130 | } |
131 | ||
21d1a161 | 132 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
133 | { |
134 | struct sockaddr_in sin; | |
b71d1d42 | 135 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 136 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
137 | |
138 | if (skb_transport_offset(skb) + 4 > skb->len) | |
139 | return; | |
140 | ||
141 | /* All current transport protocols have the port numbers in the | |
142 | * first four bytes of the transport header and this function is | |
143 | * written with this assumption in mind. | |
144 | */ | |
145 | ||
146 | sin.sin_family = AF_INET; | |
147 | sin.sin_addr.s_addr = iph->daddr; | |
148 | sin.sin_port = ports[1]; | |
149 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
150 | ||
151 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
152 | } | |
1da177e4 | 153 | |
5961de9f TH |
154 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, |
155 | int offset) | |
1da177e4 LT |
156 | { |
157 | struct inet_sock *inet = inet_sk(skb->sk); | |
95c96174 | 158 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
159 | |
160 | /* Ordered by supposed usage frequency */ | |
c44d13d6 | 161 | if (flags & IP_CMSG_PKTINFO) { |
1da177e4 | 162 | ip_cmsg_recv_pktinfo(msg, skb); |
1da177e4 | 163 | |
c44d13d6 TH |
164 | flags &= ~IP_CMSG_PKTINFO; |
165 | if (!flags) | |
166 | return; | |
167 | } | |
168 | ||
169 | if (flags & IP_CMSG_TTL) { | |
1da177e4 | 170 | ip_cmsg_recv_ttl(msg, skb); |
1da177e4 | 171 | |
c44d13d6 TH |
172 | flags &= ~IP_CMSG_TTL; |
173 | if (!flags) | |
174 | return; | |
175 | } | |
176 | ||
177 | if (flags & IP_CMSG_TOS) { | |
1da177e4 | 178 | ip_cmsg_recv_tos(msg, skb); |
1da177e4 | 179 | |
c44d13d6 TH |
180 | flags &= ~IP_CMSG_TOS; |
181 | if (!flags) | |
182 | return; | |
183 | } | |
184 | ||
185 | if (flags & IP_CMSG_RECVOPTS) { | |
1da177e4 | 186 | ip_cmsg_recv_opts(msg, skb); |
1da177e4 | 187 | |
c44d13d6 TH |
188 | flags &= ~IP_CMSG_RECVOPTS; |
189 | if (!flags) | |
190 | return; | |
191 | } | |
192 | ||
193 | if (flags & IP_CMSG_RETOPTS) { | |
1da177e4 | 194 | ip_cmsg_recv_retopts(msg, skb); |
2c7946a7 | 195 | |
c44d13d6 TH |
196 | flags &= ~IP_CMSG_RETOPTS; |
197 | if (!flags) | |
198 | return; | |
199 | } | |
200 | ||
201 | if (flags & IP_CMSG_PASSSEC) { | |
2c7946a7 | 202 | ip_cmsg_recv_security(msg, skb); |
e8b2dfe9 | 203 | |
c44d13d6 TH |
204 | flags &= ~IP_CMSG_PASSSEC; |
205 | if (!flags) | |
206 | return; | |
207 | } | |
208 | ||
ad6f939a | 209 | if (flags & IP_CMSG_ORIGDSTADDR) { |
e8b2dfe9 BS |
210 | ip_cmsg_recv_dstaddr(msg, skb); |
211 | ||
ad6f939a TH |
212 | flags &= ~IP_CMSG_ORIGDSTADDR; |
213 | if (!flags) | |
214 | return; | |
215 | } | |
216 | ||
217 | if (flags & IP_CMSG_CHECKSUM) | |
218 | ip_cmsg_recv_checksum(msg, skb, offset); | |
1da177e4 | 219 | } |
5961de9f | 220 | EXPORT_SYMBOL(ip_cmsg_recv_offset); |
1da177e4 | 221 | |
c8e6ad08 HFS |
222 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, |
223 | bool allow_ipv6) | |
1da177e4 | 224 | { |
f02db315 | 225 | int err, val; |
1da177e4 LT |
226 | struct cmsghdr *cmsg; |
227 | ||
f95b414e | 228 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
229 | if (!CMSG_OK(msg, cmsg)) |
230 | return -EINVAL; | |
5337b5b7 | 231 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
232 | if (allow_ipv6 && |
233 | cmsg->cmsg_level == SOL_IPV6 && | |
234 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
235 | struct in6_pktinfo *src_info; | |
236 | ||
237 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
238 | return -EINVAL; | |
239 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
240 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
241 | return -EINVAL; | |
242 | ipc->oif = src_info->ipi6_ifindex; | |
243 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; | |
244 | continue; | |
245 | } | |
246 | #endif | |
1da177e4 LT |
247 | if (cmsg->cmsg_level != SOL_IP) |
248 | continue; | |
249 | switch (cmsg->cmsg_type) { | |
250 | case IP_RETOPTS: | |
251 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
91948309 ED |
252 | |
253 | /* Our caller is responsible for freeing ipc->opt */ | |
4d52cfbe ED |
254 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
255 | err < 40 ? err : 40); | |
1da177e4 LT |
256 | if (err) |
257 | return err; | |
258 | break; | |
259 | case IP_PKTINFO: | |
260 | { | |
261 | struct in_pktinfo *info; | |
262 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
263 | return -EINVAL; | |
264 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
265 | ipc->oif = info->ipi_ifindex; | |
266 | ipc->addr = info->ipi_spec_dst.s_addr; | |
267 | break; | |
268 | } | |
f02db315 FF |
269 | case IP_TTL: |
270 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
271 | return -EINVAL; | |
272 | val = *(int *)CMSG_DATA(cmsg); | |
273 | if (val < 1 || val > 255) | |
274 | return -EINVAL; | |
275 | ipc->ttl = val; | |
276 | break; | |
277 | case IP_TOS: | |
278 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
279 | return -EINVAL; | |
280 | val = *(int *)CMSG_DATA(cmsg); | |
281 | if (val < 0 || val > 255) | |
282 | return -EINVAL; | |
283 | ipc->tos = val; | |
284 | ipc->priority = rt_tos2priority(ipc->tos); | |
285 | break; | |
286 | ||
1da177e4 LT |
287 | default: |
288 | return -EINVAL; | |
289 | } | |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
294 | ||
295 | /* Special input handler for packets caught by router alert option. | |
296 | They are selected only by protocol field, and then processed likely | |
297 | local ones; but only if someone wants them! Otherwise, router | |
298 | not running rsvpd will kill RSVP. | |
299 | ||
300 | It is user level problem, what it will make with them. | |
301 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
302 | but receiver should be enough clever f.e. to forward mtrace requests, | |
303 | sent to multicast group to reach destination designated router. | |
304 | */ | |
43a951e9 | 305 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
306 | static DEFINE_SPINLOCK(ip_ra_lock); |
307 | ||
592fcb9d ED |
308 | |
309 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 310 | { |
592fcb9d ED |
311 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
312 | ||
313 | sock_put(ra->saved_sk); | |
314 | kfree(ra); | |
66018506 | 315 | } |
1da177e4 | 316 | |
4d52cfbe ED |
317 | int ip_ra_control(struct sock *sk, unsigned char on, |
318 | void (*destructor)(struct sock *)) | |
1da177e4 | 319 | { |
43a951e9 ED |
320 | struct ip_ra_chain *ra, *new_ra; |
321 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 322 | |
c720c7e8 | 323 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
324 | return -EINVAL; |
325 | ||
326 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
327 | ||
66018506 | 328 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
329 | for (rap = &ip_ra_chain; |
330 | (ra = rcu_dereference_protected(*rap, | |
331 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
332 | rap = &ra->next) { | |
1da177e4 LT |
333 | if (ra->sk == sk) { |
334 | if (on) { | |
66018506 | 335 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 336 | kfree(new_ra); |
1da177e4 LT |
337 | return -EADDRINUSE; |
338 | } | |
592fcb9d ED |
339 | /* dont let ip_call_ra_chain() use sk again */ |
340 | ra->sk = NULL; | |
8e380f00 | 341 | RCU_INIT_POINTER(*rap, ra->next); |
66018506 | 342 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
343 | |
344 | if (ra->destructor) | |
345 | ra->destructor(sk); | |
592fcb9d ED |
346 | /* |
347 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
348 | * period. This guarantee ip_call_ra_chain() dont need | |
349 | * to mess with socket refcounts. | |
350 | */ | |
351 | ra->saved_sk = sk; | |
352 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
353 | return 0; |
354 | } | |
355 | } | |
51456b29 | 356 | if (!new_ra) { |
66018506 | 357 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
358 | return -ENOBUFS; |
359 | } | |
360 | new_ra->sk = sk; | |
361 | new_ra->destructor = destructor; | |
362 | ||
8e380f00 | 363 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 364 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 365 | sock_hold(sk); |
66018506 | 366 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
367 | |
368 | return 0; | |
369 | } | |
370 | ||
e905a9ed | 371 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 372 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 373 | { |
1da177e4 LT |
374 | struct sock_exterr_skb *serr; |
375 | ||
1da177e4 LT |
376 | skb = skb_clone(skb, GFP_ATOMIC); |
377 | if (!skb) | |
378 | return; | |
379 | ||
e905a9ed | 380 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
381 | serr->ee.ee_errno = err; |
382 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
383 | serr->ee.ee_type = icmp_hdr(skb)->type; |
384 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
385 | serr->ee.ee_pad = 0; |
386 | serr->ee.ee_info = info; | |
387 | serr->ee.ee_data = 0; | |
88c7664f | 388 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 389 | skb_network_header(skb); |
1da177e4 LT |
390 | serr->port = port; |
391 | ||
00db4124 | 392 | if (skb_pull(skb, payload - skb->data)) { |
bd82393c ACM |
393 | skb_reset_transport_header(skb); |
394 | if (sock_queue_err_skb(sk, skb) == 0) | |
395 | return; | |
396 | } | |
397 | kfree_skb(skb); | |
1da177e4 LT |
398 | } |
399 | ||
0579016e | 400 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
401 | { |
402 | struct inet_sock *inet = inet_sk(sk); | |
403 | struct sock_exterr_skb *serr; | |
404 | struct iphdr *iph; | |
405 | struct sk_buff *skb; | |
406 | ||
407 | if (!inet->recverr) | |
408 | return; | |
409 | ||
410 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
411 | if (!skb) | |
412 | return; | |
413 | ||
2ca9e6f2 ACM |
414 | skb_put(skb, sizeof(struct iphdr)); |
415 | skb_reset_network_header(skb); | |
eddc9ec5 | 416 | iph = ip_hdr(skb); |
1da177e4 LT |
417 | iph->daddr = daddr; |
418 | ||
e905a9ed | 419 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
420 | serr->ee.ee_errno = err; |
421 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 422 | serr->ee.ee_type = 0; |
1da177e4 LT |
423 | serr->ee.ee_code = 0; |
424 | serr->ee.ee_pad = 0; | |
425 | serr->ee.ee_info = info; | |
426 | serr->ee.ee_data = 0; | |
d56f90a7 | 427 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
428 | serr->port = port; |
429 | ||
27a884dc | 430 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 431 | skb_reset_transport_header(skb); |
1da177e4 LT |
432 | |
433 | if (sock_queue_err_skb(sk, skb)) | |
434 | kfree_skb(skb); | |
435 | } | |
436 | ||
34b99df4 JA |
437 | /* For some errors we have valid addr_offset even with zero payload and |
438 | * zero port. Also, addr_offset should be supported if port is set. | |
439 | */ | |
440 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
441 | { | |
442 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
443 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
444 | } | |
445 | ||
c247f053 WB |
446 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
447 | * | |
448 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
449 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
450 | */ | |
451 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
452 | struct sk_buff *skb, | |
453 | int ee_origin) | |
829ae9d6 | 454 | { |
c247f053 WB |
455 | struct in_pktinfo *info; |
456 | ||
457 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
458 | return true; | |
829ae9d6 | 459 | |
c247f053 WB |
460 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
461 | return false; | |
462 | ||
463 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
464 | * timestamp with egress dev. Not possible for packets without dev | |
465 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). | |
466 | */ | |
467 | if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || | |
829ae9d6 WB |
468 | (!skb->dev)) |
469 | return false; | |
470 | ||
c247f053 | 471 | info = PKTINFO_SKB_CB(skb); |
829ae9d6 WB |
472 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; |
473 | info->ipi_ifindex = skb->dev->ifindex; | |
474 | return true; | |
475 | } | |
476 | ||
e905a9ed | 477 | /* |
1da177e4 LT |
478 | * Handle MSG_ERRQUEUE |
479 | */ | |
85fbaa75 | 480 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
481 | { |
482 | struct sock_exterr_skb *serr; | |
364a9e93 | 483 | struct sk_buff *skb; |
342dfc30 | 484 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
485 | struct { |
486 | struct sock_extended_err ee; | |
487 | struct sockaddr_in offender; | |
488 | } errhdr; | |
489 | int err; | |
490 | int copied; | |
491 | ||
7ce875e5 WB |
492 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
493 | ||
1da177e4 | 494 | err = -EAGAIN; |
364a9e93 | 495 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 496 | if (!skb) |
1da177e4 LT |
497 | goto out; |
498 | ||
499 | copied = skb->len; | |
500 | if (copied > len) { | |
501 | msg->msg_flags |= MSG_TRUNC; | |
502 | copied = len; | |
503 | } | |
51f3d02b | 504 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
505 | if (err) |
506 | goto out_free_skb; | |
507 | ||
508 | sock_recv_timestamp(msg, sk, skb); | |
509 | ||
510 | serr = SKB_EXT_ERR(skb); | |
511 | ||
34b99df4 | 512 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 513 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
514 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
515 | serr->addr_offset); | |
1da177e4 LT |
516 | sin->sin_port = serr->port; |
517 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 518 | *addr_len = sizeof(*sin); |
1da177e4 LT |
519 | } |
520 | ||
521 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
522 | sin = &errhdr.offender; | |
f812116b | 523 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 524 | |
c247f053 | 525 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 526 | sin->sin_family = AF_INET; |
eddc9ec5 | 527 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 528 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
529 | ip_cmsg_recv(msg, skb); |
530 | } | |
531 | ||
532 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
533 | ||
534 | /* Now we could try to dump offended packet options */ | |
535 | ||
536 | msg->msg_flags |= MSG_ERRQUEUE; | |
537 | err = copied; | |
538 | ||
e905a9ed | 539 | out_free_skb: |
1da177e4 LT |
540 | kfree_skb(skb); |
541 | out: | |
542 | return err; | |
543 | } | |
544 | ||
545 | ||
546 | /* | |
4d52cfbe ED |
547 | * Socket option code for IP. This is the end of the line after any |
548 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 549 | */ |
baf606d9 MRL |
550 | static bool setsockopt_needs_rtnl(int optname) |
551 | { | |
552 | switch (optname) { | |
553 | case IP_ADD_MEMBERSHIP: | |
554 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 555 | case IP_BLOCK_SOURCE: |
baf606d9 | 556 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
557 | case IP_DROP_SOURCE_MEMBERSHIP: |
558 | case IP_MSFILTER: | |
559 | case IP_UNBLOCK_SOURCE: | |
560 | case MCAST_BLOCK_SOURCE: | |
561 | case MCAST_MSFILTER: | |
baf606d9 | 562 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 563 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 564 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
565 | case MCAST_LEAVE_SOURCE_GROUP: |
566 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
567 | return true; |
568 | } | |
569 | return false; | |
570 | } | |
1da177e4 | 571 | |
3fdadf7d | 572 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 573 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
574 | { |
575 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 576 | int val = 0, err; |
baf606d9 | 577 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 578 | |
0c9f79be XW |
579 | switch (optname) { |
580 | case IP_PKTINFO: | |
581 | case IP_RECVTTL: | |
582 | case IP_RECVOPTS: | |
583 | case IP_RECVTOS: | |
584 | case IP_RETOPTS: | |
585 | case IP_TOS: | |
586 | case IP_TTL: | |
587 | case IP_HDRINCL: | |
588 | case IP_MTU_DISCOVER: | |
589 | case IP_RECVERR: | |
590 | case IP_ROUTER_ALERT: | |
591 | case IP_FREEBIND: | |
592 | case IP_PASSSEC: | |
593 | case IP_TRANSPARENT: | |
594 | case IP_MINTTL: | |
595 | case IP_NODEFRAG: | |
90c337da | 596 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
597 | case IP_UNICAST_IF: |
598 | case IP_MULTICAST_TTL: | |
599 | case IP_MULTICAST_ALL: | |
600 | case IP_MULTICAST_LOOP: | |
601 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 602 | case IP_CHECKSUM: |
1da177e4 LT |
603 | if (optlen >= sizeof(int)) { |
604 | if (get_user(val, (int __user *) optval)) | |
605 | return -EFAULT; | |
606 | } else if (optlen >= sizeof(char)) { | |
607 | unsigned char ucval; | |
608 | ||
609 | if (get_user(ucval, (unsigned char __user *) optval)) | |
610 | return -EFAULT; | |
611 | val = (int) ucval; | |
612 | } | |
613 | } | |
614 | ||
615 | /* If optlen==0, it is equivalent to val == 0 */ | |
616 | ||
6a9fb947 | 617 | if (ip_mroute_opt(optname)) |
09cb105e | 618 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
619 | |
620 | err = 0; | |
baf606d9 MRL |
621 | if (needs_rtnl) |
622 | rtnl_lock(); | |
1da177e4 LT |
623 | lock_sock(sk); |
624 | ||
625 | switch (optname) { | |
132adf54 SH |
626 | case IP_OPTIONS: |
627 | { | |
f6d8bd05 ED |
628 | struct ip_options_rcu *old, *opt = NULL; |
629 | ||
65a1c4ff | 630 | if (optlen > 40) |
132adf54 | 631 | goto e_inval; |
3b1e0a65 | 632 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 633 | optval, optlen); |
132adf54 SH |
634 | if (err) |
635 | break; | |
f6d8bd05 ED |
636 | old = rcu_dereference_protected(inet->inet_opt, |
637 | sock_owned_by_user(sk)); | |
132adf54 SH |
638 | if (inet->is_icsk) { |
639 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 640 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
641 | if (sk->sk_family == PF_INET || |
642 | (!((1 << sk->sk_state) & | |
643 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 644 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 645 | #endif |
f6d8bd05 ED |
646 | if (old) |
647 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 648 | if (opt) |
f6d8bd05 | 649 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 650 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 651 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 652 | } |
132adf54 | 653 | #endif |
1da177e4 | 654 | } |
f6d8bd05 ED |
655 | rcu_assign_pointer(inet->inet_opt, opt); |
656 | if (old) | |
605b4afe | 657 | kfree_rcu(old, rcu); |
132adf54 SH |
658 | break; |
659 | } | |
660 | case IP_PKTINFO: | |
661 | if (val) | |
662 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
663 | else | |
664 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
665 | break; | |
666 | case IP_RECVTTL: | |
667 | if (val) | |
668 | inet->cmsg_flags |= IP_CMSG_TTL; | |
669 | else | |
670 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
671 | break; | |
672 | case IP_RECVTOS: | |
673 | if (val) | |
674 | inet->cmsg_flags |= IP_CMSG_TOS; | |
675 | else | |
676 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
677 | break; | |
678 | case IP_RECVOPTS: | |
679 | if (val) | |
680 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
681 | else | |
682 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
683 | break; | |
684 | case IP_RETOPTS: | |
685 | if (val) | |
686 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
687 | else | |
688 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
689 | break; | |
690 | case IP_PASSSEC: | |
691 | if (val) | |
692 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
693 | else | |
694 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
695 | break; | |
e8b2dfe9 BS |
696 | case IP_RECVORIGDSTADDR: |
697 | if (val) | |
698 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
699 | else | |
700 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
701 | break; | |
ad6f939a TH |
702 | case IP_CHECKSUM: |
703 | if (val) { | |
704 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
705 | inet_inc_convert_csum(sk); | |
706 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
707 | } | |
708 | } else { | |
709 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
710 | inet_dec_convert_csum(sk); | |
711 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
712 | } | |
713 | } | |
714 | break; | |
132adf54 SH |
715 | case IP_TOS: /* This sets both TOS and Precedence */ |
716 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
717 | val &= ~INET_ECN_MASK; |
718 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 719 | } |
132adf54 SH |
720 | if (inet->tos != val) { |
721 | inet->tos = val; | |
722 | sk->sk_priority = rt_tos2priority(val); | |
723 | sk_dst_reset(sk); | |
724 | } | |
725 | break; | |
726 | case IP_TTL: | |
4d52cfbe | 727 | if (optlen < 1) |
132adf54 | 728 | goto e_inval; |
c9be4a5c | 729 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
730 | goto e_inval; |
731 | inet->uc_ttl = val; | |
732 | break; | |
733 | case IP_HDRINCL: | |
734 | if (sk->sk_type != SOCK_RAW) { | |
735 | err = -ENOPROTOOPT; | |
2c7946a7 | 736 | break; |
132adf54 SH |
737 | } |
738 | inet->hdrincl = val ? 1 : 0; | |
739 | break; | |
7b2ff18e JO |
740 | case IP_NODEFRAG: |
741 | if (sk->sk_type != SOCK_RAW) { | |
742 | err = -ENOPROTOOPT; | |
743 | break; | |
744 | } | |
745 | inet->nodefrag = val ? 1 : 0; | |
746 | break; | |
90c337da ED |
747 | case IP_BIND_ADDRESS_NO_PORT: |
748 | inet->bind_address_no_port = val ? 1 : 0; | |
749 | break; | |
132adf54 | 750 | case IP_MTU_DISCOVER: |
1b346576 | 751 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
752 | goto e_inval; |
753 | inet->pmtudisc = val; | |
754 | break; | |
755 | case IP_RECVERR: | |
756 | inet->recverr = !!val; | |
757 | if (!val) | |
758 | skb_queue_purge(&sk->sk_error_queue); | |
759 | break; | |
760 | case IP_MULTICAST_TTL: | |
761 | if (sk->sk_type == SOCK_STREAM) | |
762 | goto e_inval; | |
4d52cfbe | 763 | if (optlen < 1) |
132adf54 | 764 | goto e_inval; |
09cb105e | 765 | if (val == -1) |
132adf54 SH |
766 | val = 1; |
767 | if (val < 0 || val > 255) | |
768 | goto e_inval; | |
769 | inet->mc_ttl = val; | |
770 | break; | |
771 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 772 | if (optlen < 1) |
132adf54 SH |
773 | goto e_inval; |
774 | inet->mc_loop = !!val; | |
775 | break; | |
76e21053 EH |
776 | case IP_UNICAST_IF: |
777 | { | |
778 | struct net_device *dev = NULL; | |
779 | int ifindex; | |
780 | ||
781 | if (optlen != sizeof(int)) | |
782 | goto e_inval; | |
783 | ||
784 | ifindex = (__force int)ntohl((__force __be32)val); | |
785 | if (ifindex == 0) { | |
786 | inet->uc_index = 0; | |
787 | err = 0; | |
788 | break; | |
789 | } | |
790 | ||
791 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
792 | err = -EADDRNOTAVAIL; | |
793 | if (!dev) | |
794 | break; | |
795 | dev_put(dev); | |
796 | ||
797 | err = -EINVAL; | |
798 | if (sk->sk_bound_dev_if) | |
799 | break; | |
800 | ||
801 | inet->uc_index = ifindex; | |
802 | err = 0; | |
803 | break; | |
804 | } | |
132adf54 SH |
805 | case IP_MULTICAST_IF: |
806 | { | |
807 | struct ip_mreqn mreq; | |
808 | struct net_device *dev = NULL; | |
809 | ||
810 | if (sk->sk_type == SOCK_STREAM) | |
811 | goto e_inval; | |
812 | /* | |
813 | * Check the arguments are allowable | |
814 | */ | |
815 | ||
0915921b SW |
816 | if (optlen < sizeof(struct in_addr)) |
817 | goto e_inval; | |
818 | ||
132adf54 SH |
819 | err = -EFAULT; |
820 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 821 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 822 | break; |
132adf54 SH |
823 | } else { |
824 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
825 | if (optlen >= sizeof(struct ip_mreq)) { |
826 | if (copy_from_user(&mreq, optval, | |
827 | sizeof(struct ip_mreq))) | |
828 | break; | |
829 | } else if (optlen >= sizeof(struct in_addr)) { | |
830 | if (copy_from_user(&mreq.imr_address, optval, | |
831 | sizeof(struct in_addr))) | |
832 | break; | |
833 | } | |
132adf54 SH |
834 | } |
835 | ||
836 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 837 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
838 | inet->mc_index = 0; |
839 | inet->mc_addr = 0; | |
840 | err = 0; | |
1da177e4 LT |
841 | break; |
842 | } | |
3b1e0a65 | 843 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 844 | if (dev) |
132adf54 | 845 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 846 | } else |
55b80503 | 847 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 848 | |
1da177e4 | 849 | |
132adf54 SH |
850 | err = -EADDRNOTAVAIL; |
851 | if (!dev) | |
852 | break; | |
55b80503 | 853 | dev_put(dev); |
132adf54 SH |
854 | |
855 | err = -EINVAL; | |
856 | if (sk->sk_bound_dev_if && | |
857 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
858 | break; | |
1da177e4 | 859 | |
132adf54 SH |
860 | inet->mc_index = mreq.imr_ifindex; |
861 | inet->mc_addr = mreq.imr_address.s_addr; | |
862 | err = 0; | |
863 | break; | |
864 | } | |
1da177e4 | 865 | |
132adf54 SH |
866 | case IP_ADD_MEMBERSHIP: |
867 | case IP_DROP_MEMBERSHIP: | |
868 | { | |
869 | struct ip_mreqn mreq; | |
1da177e4 | 870 | |
a96fb49b FL |
871 | err = -EPROTO; |
872 | if (inet_sk(sk)->is_icsk) | |
873 | break; | |
874 | ||
132adf54 SH |
875 | if (optlen < sizeof(struct ip_mreq)) |
876 | goto e_inval; | |
877 | err = -EFAULT; | |
878 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 879 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 880 | break; |
132adf54 SH |
881 | } else { |
882 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 883 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 884 | break; |
132adf54 | 885 | } |
1da177e4 | 886 | |
132adf54 | 887 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 888 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 889 | else |
54ff9ef3 | 890 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
891 | break; |
892 | } | |
893 | case IP_MSFILTER: | |
894 | { | |
132adf54 SH |
895 | struct ip_msfilter *msf; |
896 | ||
897 | if (optlen < IP_MSFILTER_SIZE(0)) | |
898 | goto e_inval; | |
899 | if (optlen > sysctl_optmem_max) { | |
900 | err = -ENOBUFS; | |
1da177e4 LT |
901 | break; |
902 | } | |
132adf54 | 903 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 904 | if (!msf) { |
132adf54 SH |
905 | err = -ENOBUFS; |
906 | break; | |
907 | } | |
908 | err = -EFAULT; | |
909 | if (copy_from_user(msf, optval, optlen)) { | |
910 | kfree(msf); | |
911 | break; | |
912 | } | |
913 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
914 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
915 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
916 | kfree(msf); | |
917 | err = -ENOBUFS; | |
918 | break; | |
919 | } | |
920 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
921 | kfree(msf); | |
922 | err = -EINVAL; | |
923 | break; | |
924 | } | |
925 | err = ip_mc_msfilter(sk, msf, 0); | |
926 | kfree(msf); | |
927 | break; | |
928 | } | |
929 | case IP_BLOCK_SOURCE: | |
930 | case IP_UNBLOCK_SOURCE: | |
931 | case IP_ADD_SOURCE_MEMBERSHIP: | |
932 | case IP_DROP_SOURCE_MEMBERSHIP: | |
933 | { | |
934 | struct ip_mreq_source mreqs; | |
935 | int omode, add; | |
1da177e4 | 936 | |
132adf54 SH |
937 | if (optlen != sizeof(struct ip_mreq_source)) |
938 | goto e_inval; | |
939 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 940 | err = -EFAULT; |
1da177e4 LT |
941 | break; |
942 | } | |
132adf54 SH |
943 | if (optname == IP_BLOCK_SOURCE) { |
944 | omode = MCAST_EXCLUDE; | |
945 | add = 1; | |
946 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
947 | omode = MCAST_EXCLUDE; | |
948 | add = 0; | |
949 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
950 | struct ip_mreqn mreq; | |
1da177e4 | 951 | |
132adf54 SH |
952 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
953 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
954 | mreq.imr_ifindex = 0; | |
54ff9ef3 | 955 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 956 | if (err && err != -EADDRINUSE) |
1da177e4 | 957 | break; |
132adf54 SH |
958 | omode = MCAST_INCLUDE; |
959 | add = 1; | |
960 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
961 | omode = MCAST_INCLUDE; | |
962 | add = 0; | |
963 | } | |
964 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
965 | break; | |
966 | } | |
967 | case MCAST_JOIN_GROUP: | |
968 | case MCAST_LEAVE_GROUP: | |
969 | { | |
970 | struct group_req greq; | |
971 | struct sockaddr_in *psin; | |
972 | struct ip_mreqn mreq; | |
973 | ||
974 | if (optlen < sizeof(struct group_req)) | |
975 | goto e_inval; | |
976 | err = -EFAULT; | |
977 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
978 | break; | |
979 | psin = (struct sockaddr_in *)&greq.gr_group; | |
980 | if (psin->sin_family != AF_INET) | |
981 | goto e_inval; | |
982 | memset(&mreq, 0, sizeof(mreq)); | |
983 | mreq.imr_multiaddr = psin->sin_addr; | |
984 | mreq.imr_ifindex = greq.gr_interface; | |
985 | ||
986 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 987 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 988 | else |
54ff9ef3 | 989 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
990 | break; |
991 | } | |
992 | case MCAST_JOIN_SOURCE_GROUP: | |
993 | case MCAST_LEAVE_SOURCE_GROUP: | |
994 | case MCAST_BLOCK_SOURCE: | |
995 | case MCAST_UNBLOCK_SOURCE: | |
996 | { | |
997 | struct group_source_req greqs; | |
998 | struct ip_mreq_source mreqs; | |
999 | struct sockaddr_in *psin; | |
1000 | int omode, add; | |
1001 | ||
1002 | if (optlen != sizeof(struct group_source_req)) | |
1003 | goto e_inval; | |
1004 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1005 | err = -EFAULT; |
1da177e4 LT |
1006 | break; |
1007 | } | |
132adf54 SH |
1008 | if (greqs.gsr_group.ss_family != AF_INET || |
1009 | greqs.gsr_source.ss_family != AF_INET) { | |
1010 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1011 | break; |
1012 | } | |
132adf54 SH |
1013 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1014 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1015 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1016 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1017 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1018 | ||
1019 | if (optname == MCAST_BLOCK_SOURCE) { | |
1020 | omode = MCAST_EXCLUDE; | |
1021 | add = 1; | |
1022 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1023 | omode = MCAST_EXCLUDE; | |
1024 | add = 0; | |
1025 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1026 | struct ip_mreqn mreq; |
1027 | ||
132adf54 | 1028 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1029 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1030 | mreq.imr_address.s_addr = 0; |
1031 | mreq.imr_ifindex = greqs.gsr_interface; | |
54ff9ef3 | 1032 | err = ip_mc_join_group(sk, &mreq); |
132adf54 SH |
1033 | if (err && err != -EADDRINUSE) |
1034 | break; | |
1035 | greqs.gsr_interface = mreq.imr_ifindex; | |
1036 | omode = MCAST_INCLUDE; | |
1037 | add = 1; | |
1038 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1039 | omode = MCAST_INCLUDE; | |
1040 | add = 0; | |
1041 | } | |
1042 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1043 | greqs.gsr_interface); | |
1044 | break; | |
1045 | } | |
1046 | case MCAST_MSFILTER: | |
1047 | { | |
132adf54 SH |
1048 | struct sockaddr_in *psin; |
1049 | struct ip_msfilter *msf = NULL; | |
1050 | struct group_filter *gsf = NULL; | |
1051 | int msize, i, ifindex; | |
1052 | ||
1053 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1054 | goto e_inval; | |
1055 | if (optlen > sysctl_optmem_max) { | |
1056 | err = -ENOBUFS; | |
1da177e4 LT |
1057 | break; |
1058 | } | |
09cb105e | 1059 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 1060 | if (!gsf) { |
132adf54 | 1061 | err = -ENOBUFS; |
1da177e4 LT |
1062 | break; |
1063 | } | |
132adf54 | 1064 | err = -EFAULT; |
4d52cfbe | 1065 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 1066 | goto mc_msf_out; |
4d52cfbe | 1067 | |
132adf54 SH |
1068 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1069 | if (gsf->gf_numsrc >= 0x1ffffff || | |
1070 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
1071 | err = -ENOBUFS; | |
1072 | goto mc_msf_out; | |
1073 | } | |
1074 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1075 | err = -EINVAL; | |
1076 | goto mc_msf_out; | |
1077 | } | |
1078 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1079 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1080 | if (!msf) { |
132adf54 SH |
1081 | err = -ENOBUFS; |
1082 | goto mc_msf_out; | |
1083 | } | |
1084 | ifindex = gsf->gf_interface; | |
1085 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1086 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1087 | err = -EADDRNOTAVAIL; |
132adf54 | 1088 | goto mc_msf_out; |
1da177e4 | 1089 | } |
132adf54 SH |
1090 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1091 | msf->imsf_interface = 0; | |
1092 | msf->imsf_fmode = gsf->gf_fmode; | |
1093 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1094 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1095 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1096 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1097 | |
132adf54 SH |
1098 | if (psin->sin_family != AF_INET) |
1099 | goto mc_msf_out; | |
1100 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1101 | } | |
1102 | kfree(gsf); | |
1103 | gsf = NULL; | |
1104 | ||
1105 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1106 | mc_msf_out: |
132adf54 SH |
1107 | kfree(msf); |
1108 | kfree(gsf); | |
1109 | break; | |
1110 | } | |
f771bef9 NS |
1111 | case IP_MULTICAST_ALL: |
1112 | if (optlen < 1) | |
1113 | goto e_inval; | |
1114 | if (val != 0 && val != 1) | |
1115 | goto e_inval; | |
1116 | inet->mc_all = val; | |
1117 | break; | |
132adf54 SH |
1118 | case IP_ROUTER_ALERT: |
1119 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1120 | break; | |
1121 | ||
1122 | case IP_FREEBIND: | |
4d52cfbe | 1123 | if (optlen < 1) |
132adf54 SH |
1124 | goto e_inval; |
1125 | inet->freebind = !!val; | |
1126 | break; | |
1127 | ||
1128 | case IP_IPSEC_POLICY: | |
1129 | case IP_XFRM_POLICY: | |
1130 | err = -EPERM; | |
52e804c6 | 1131 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1132 | break; |
132adf54 SH |
1133 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1134 | break; | |
1da177e4 | 1135 | |
f5715aea | 1136 | case IP_TRANSPARENT: |
52e804c6 EB |
1137 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1138 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1139 | err = -EPERM; |
1140 | break; | |
1141 | } | |
1142 | if (optlen < 1) | |
1143 | goto e_inval; | |
1144 | inet->transparent = !!val; | |
1145 | break; | |
1146 | ||
d218d111 SH |
1147 | case IP_MINTTL: |
1148 | if (optlen < 1) | |
1149 | goto e_inval; | |
1150 | if (val < 0 || val > 255) | |
1151 | goto e_inval; | |
1152 | inet->min_ttl = val; | |
1153 | break; | |
1154 | ||
132adf54 SH |
1155 | default: |
1156 | err = -ENOPROTOOPT; | |
1157 | break; | |
1da177e4 LT |
1158 | } |
1159 | release_sock(sk); | |
baf606d9 MRL |
1160 | if (needs_rtnl) |
1161 | rtnl_unlock(); | |
1da177e4 LT |
1162 | return err; |
1163 | ||
1164 | e_inval: | |
1165 | release_sock(sk); | |
baf606d9 MRL |
1166 | if (needs_rtnl) |
1167 | rtnl_unlock(); | |
1da177e4 LT |
1168 | return -EINVAL; |
1169 | } | |
1170 | ||
f84af32c | 1171 | /** |
829ae9d6 | 1172 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1173 | * @sk: socket |
1174 | * @skb: buffer | |
1175 | * | |
35ebf65e DM |
1176 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1177 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1178 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1179 | */ |
fbf8866d | 1180 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1181 | { |
d826eb14 | 1182 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1183 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1184 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1185 | |
4b261c75 | 1186 | if (prepare && skb_rtable(skb)) { |
92101b3b | 1187 | pktinfo->ipi_ifindex = inet_iif(skb); |
35ebf65e | 1188 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1189 | } else { |
1190 | pktinfo->ipi_ifindex = 0; | |
1191 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1192 | } | |
1193 | skb_dst_drop(skb); | |
f84af32c | 1194 | } |
f84af32c | 1195 | |
3fdadf7d | 1196 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1197 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1198 | { |
1199 | int err; | |
1200 | ||
1201 | if (level != SOL_IP) | |
1202 | return -ENOPROTOOPT; | |
1203 | ||
1204 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1205 | #ifdef CONFIG_NETFILTER | |
1206 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1207 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1208 | optname != IP_IPSEC_POLICY && |
1209 | optname != IP_XFRM_POLICY && | |
1210 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1211 | lock_sock(sk); |
1212 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1213 | release_sock(sk); | |
1214 | } | |
1215 | #endif | |
1216 | return err; | |
1217 | } | |
4d52cfbe | 1218 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1219 | |
1220 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1221 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1222 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1223 | { |
1224 | int err; | |
1225 | ||
1226 | if (level != SOL_IP) | |
1227 | return -ENOPROTOOPT; | |
1228 | ||
dae50295 DS |
1229 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1230 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1231 | ip_setsockopt); | |
1232 | ||
3fdadf7d DM |
1233 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1234 | #ifdef CONFIG_NETFILTER | |
1235 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1236 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1237 | optname != IP_IPSEC_POLICY && |
1238 | optname != IP_XFRM_POLICY && | |
1239 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1240 | lock_sock(sk); |
543d9cfe ACM |
1241 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1242 | optval, optlen); | |
3fdadf7d DM |
1243 | release_sock(sk); |
1244 | } | |
1245 | #endif | |
1246 | return err; | |
1247 | } | |
543d9cfe | 1248 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1249 | #endif |
1250 | ||
1da177e4 | 1251 | /* |
4d52cfbe ED |
1252 | * Get the options. Note for future reference. The GET of IP options gets |
1253 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1254 | */ |
1255 | ||
87e9f031 WC |
1256 | static bool getsockopt_needs_rtnl(int optname) |
1257 | { | |
1258 | switch (optname) { | |
1259 | case IP_MSFILTER: | |
1260 | case MCAST_MSFILTER: | |
1261 | return true; | |
1262 | } | |
1263 | return false; | |
1264 | } | |
1265 | ||
3fdadf7d | 1266 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1267 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1268 | { |
1269 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1270 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1271 | int val, err = 0; | |
1da177e4 | 1272 | int len; |
e905a9ed | 1273 | |
132adf54 | 1274 | if (level != SOL_IP) |
1da177e4 LT |
1275 | return -EOPNOTSUPP; |
1276 | ||
6a9fb947 | 1277 | if (ip_mroute_opt(optname)) |
09cb105e | 1278 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1279 | |
09cb105e | 1280 | if (get_user(len, optlen)) |
1da177e4 | 1281 | return -EFAULT; |
132adf54 | 1282 | if (len < 0) |
1da177e4 | 1283 | return -EINVAL; |
e905a9ed | 1284 | |
87e9f031 WC |
1285 | if (needs_rtnl) |
1286 | rtnl_lock(); | |
1da177e4 LT |
1287 | lock_sock(sk); |
1288 | ||
132adf54 SH |
1289 | switch (optname) { |
1290 | case IP_OPTIONS: | |
1291 | { | |
1292 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1293 | struct ip_options *opt = (struct ip_options *)optbuf; |
1294 | struct ip_options_rcu *inet_opt; | |
1295 | ||
1296 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1297 | sock_owned_by_user(sk)); | |
132adf54 | 1298 | opt->optlen = 0; |
f6d8bd05 ED |
1299 | if (inet_opt) |
1300 | memcpy(optbuf, &inet_opt->opt, | |
1301 | sizeof(struct ip_options) + | |
1302 | inet_opt->opt.optlen); | |
132adf54 SH |
1303 | release_sock(sk); |
1304 | ||
1305 | if (opt->optlen == 0) | |
1306 | return put_user(0, optlen); | |
1307 | ||
1308 | ip_options_undo(opt); | |
1309 | ||
1310 | len = min_t(unsigned int, len, opt->optlen); | |
1311 | if (put_user(len, optlen)) | |
1312 | return -EFAULT; | |
1313 | if (copy_to_user(optval, opt->__data, len)) | |
1314 | return -EFAULT; | |
1315 | return 0; | |
1316 | } | |
1317 | case IP_PKTINFO: | |
1318 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1319 | break; | |
1320 | case IP_RECVTTL: | |
1321 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1322 | break; | |
1323 | case IP_RECVTOS: | |
1324 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1325 | break; | |
1326 | case IP_RECVOPTS: | |
1327 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1328 | break; | |
1329 | case IP_RETOPTS: | |
1330 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1331 | break; | |
1332 | case IP_PASSSEC: | |
1333 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1334 | break; | |
e8b2dfe9 BS |
1335 | case IP_RECVORIGDSTADDR: |
1336 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1337 | break; | |
ad6f939a TH |
1338 | case IP_CHECKSUM: |
1339 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1340 | break; | |
132adf54 SH |
1341 | case IP_TOS: |
1342 | val = inet->tos; | |
1343 | break; | |
1344 | case IP_TTL: | |
1345 | val = (inet->uc_ttl == -1 ? | |
1346 | sysctl_ip_default_ttl : | |
1347 | inet->uc_ttl); | |
1348 | break; | |
1349 | case IP_HDRINCL: | |
1350 | val = inet->hdrincl; | |
1351 | break; | |
a89b4763 MK |
1352 | case IP_NODEFRAG: |
1353 | val = inet->nodefrag; | |
1354 | break; | |
90c337da ED |
1355 | case IP_BIND_ADDRESS_NO_PORT: |
1356 | val = inet->bind_address_no_port; | |
1357 | break; | |
132adf54 SH |
1358 | case IP_MTU_DISCOVER: |
1359 | val = inet->pmtudisc; | |
1360 | break; | |
1361 | case IP_MTU: | |
1362 | { | |
1363 | struct dst_entry *dst; | |
1364 | val = 0; | |
1365 | dst = sk_dst_get(sk); | |
1366 | if (dst) { | |
1367 | val = dst_mtu(dst); | |
1368 | dst_release(dst); | |
1da177e4 | 1369 | } |
132adf54 | 1370 | if (!val) { |
1da177e4 | 1371 | release_sock(sk); |
132adf54 | 1372 | return -ENOTCONN; |
1da177e4 | 1373 | } |
132adf54 SH |
1374 | break; |
1375 | } | |
1376 | case IP_RECVERR: | |
1377 | val = inet->recverr; | |
1378 | break; | |
1379 | case IP_MULTICAST_TTL: | |
1380 | val = inet->mc_ttl; | |
1381 | break; | |
1382 | case IP_MULTICAST_LOOP: | |
1383 | val = inet->mc_loop; | |
1384 | break; | |
76e21053 EH |
1385 | case IP_UNICAST_IF: |
1386 | val = (__force int)htonl((__u32) inet->uc_index); | |
1387 | break; | |
132adf54 SH |
1388 | case IP_MULTICAST_IF: |
1389 | { | |
1390 | struct in_addr addr; | |
1391 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1392 | addr.s_addr = inet->mc_addr; | |
1393 | release_sock(sk); | |
1da177e4 | 1394 | |
132adf54 SH |
1395 | if (put_user(len, optlen)) |
1396 | return -EFAULT; | |
1397 | if (copy_to_user(optval, &addr, len)) | |
1398 | return -EFAULT; | |
1399 | return 0; | |
1400 | } | |
1401 | case IP_MSFILTER: | |
1402 | { | |
1403 | struct ip_msfilter msf; | |
132adf54 SH |
1404 | |
1405 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1406 | err = -EINVAL; |
1407 | goto out; | |
1da177e4 | 1408 | } |
132adf54 | 1409 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1410 | err = -EFAULT; |
1411 | goto out; | |
1da177e4 | 1412 | } |
132adf54 SH |
1413 | err = ip_mc_msfget(sk, &msf, |
1414 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1415 | goto out; |
132adf54 SH |
1416 | } |
1417 | case MCAST_MSFILTER: | |
1418 | { | |
1419 | struct group_filter gsf; | |
1da177e4 | 1420 | |
132adf54 | 1421 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1422 | err = -EINVAL; |
1423 | goto out; | |
132adf54 SH |
1424 | } |
1425 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1426 | err = -EFAULT; |
1427 | goto out; | |
132adf54 SH |
1428 | } |
1429 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1430 | (struct group_filter __user *)optval, |
1431 | optlen); | |
87e9f031 | 1432 | goto out; |
132adf54 | 1433 | } |
f771bef9 NS |
1434 | case IP_MULTICAST_ALL: |
1435 | val = inet->mc_all; | |
1436 | break; | |
132adf54 SH |
1437 | case IP_PKTOPTIONS: |
1438 | { | |
1439 | struct msghdr msg; | |
1da177e4 | 1440 | |
132adf54 | 1441 | release_sock(sk); |
1da177e4 | 1442 | |
132adf54 SH |
1443 | if (sk->sk_type != SOCK_STREAM) |
1444 | return -ENOPROTOOPT; | |
1da177e4 | 1445 | |
c54a5e02 | 1446 | msg.msg_control = (__force void *) optval; |
132adf54 | 1447 | msg.msg_controllen = len; |
dd23198e | 1448 | msg.msg_flags = flags; |
1da177e4 | 1449 | |
132adf54 SH |
1450 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1451 | struct in_pktinfo info; | |
1452 | ||
c720c7e8 ED |
1453 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1454 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1455 | info.ipi_ifindex = inet->mc_index; |
1456 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1457 | } |
132adf54 SH |
1458 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1459 | int hlim = inet->mc_ttl; | |
1460 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1461 | } | |
4c507d28 JB |
1462 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1463 | int tos = inet->rcv_tos; | |
1464 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1465 | } | |
132adf54 SH |
1466 | len -= msg.msg_controllen; |
1467 | return put_user(len, optlen); | |
1468 | } | |
1469 | case IP_FREEBIND: | |
1470 | val = inet->freebind; | |
1471 | break; | |
f5715aea KK |
1472 | case IP_TRANSPARENT: |
1473 | val = inet->transparent; | |
1474 | break; | |
d218d111 SH |
1475 | case IP_MINTTL: |
1476 | val = inet->min_ttl; | |
1477 | break; | |
132adf54 SH |
1478 | default: |
1479 | release_sock(sk); | |
1480 | return -ENOPROTOOPT; | |
1da177e4 LT |
1481 | } |
1482 | release_sock(sk); | |
e905a9ed | 1483 | |
4d52cfbe | 1484 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1485 | unsigned char ucval = (unsigned char)val; |
1486 | len = 1; | |
132adf54 | 1487 | if (put_user(len, optlen)) |
1da177e4 | 1488 | return -EFAULT; |
09cb105e | 1489 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1490 | return -EFAULT; |
1491 | } else { | |
1492 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1493 | if (put_user(len, optlen)) |
1da177e4 | 1494 | return -EFAULT; |
09cb105e | 1495 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1496 | return -EFAULT; |
1497 | } | |
1498 | return 0; | |
87e9f031 WC |
1499 | |
1500 | out: | |
1501 | release_sock(sk); | |
1502 | if (needs_rtnl) | |
1503 | rtnl_unlock(); | |
1504 | return err; | |
1da177e4 LT |
1505 | } |
1506 | ||
3fdadf7d | 1507 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1508 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1509 | { |
1510 | int err; | |
1511 | ||
dd23198e | 1512 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1513 | #ifdef CONFIG_NETFILTER |
1514 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1515 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1516 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1517 | int len; |
3fdadf7d | 1518 | |
09cb105e | 1519 | if (get_user(len, optlen)) |
3fdadf7d DM |
1520 | return -EFAULT; |
1521 | ||
1522 | lock_sock(sk); | |
1523 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1524 | &len); | |
1525 | release_sock(sk); | |
1526 | if (err >= 0) | |
1527 | err = put_user(len, optlen); | |
1528 | return err; | |
1529 | } | |
1530 | #endif | |
1531 | return err; | |
1532 | } | |
4d52cfbe | 1533 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1534 | |
1535 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1536 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1537 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1538 | { |
42908c69 DS |
1539 | int err; |
1540 | ||
1541 | if (optname == MCAST_MSFILTER) | |
1542 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1543 | ip_getsockopt); | |
1544 | ||
dd23198e DB |
1545 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1546 | MSG_CMSG_COMPAT); | |
42908c69 | 1547 | |
3fdadf7d DM |
1548 | #ifdef CONFIG_NETFILTER |
1549 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1550 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1551 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1552 | int len; |
3fdadf7d | 1553 | |
543d9cfe | 1554 | if (get_user(len, optlen)) |
3fdadf7d DM |
1555 | return -EFAULT; |
1556 | ||
1557 | lock_sock(sk); | |
543d9cfe | 1558 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1559 | release_sock(sk); |
1560 | if (err >= 0) | |
1561 | err = put_user(len, optlen); | |
1562 | return err; | |
1563 | } | |
1564 | #endif | |
1565 | return err; | |
1566 | } | |
543d9cfe | 1567 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1568 | #endif |