Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * The IP to API glue. | |
e905a9ed | 8 | * |
1da177e4 LT |
9 | * Authors: see ip.c |
10 | * | |
11 | * Fixes: | |
12 | * Many : Split from ip.c , see ip.c for history. | |
13 | * Martin Mares : TOS setting fixed. | |
e905a9ed | 14 | * Alan Cox : Fixed a couple of oopses in Martin's |
1da177e4 LT |
15 | * TOS tweaks. |
16 | * Mike McLagan : Routing by source | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/types.h> | |
21 | #include <linux/mm.h> | |
1da177e4 LT |
22 | #include <linux/skbuff.h> |
23 | #include <linux/ip.h> | |
24 | #include <linux/icmp.h> | |
14c85021 | 25 | #include <linux/inetdevice.h> |
1da177e4 | 26 | #include <linux/netdevice.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
1da177e4 LT |
28 | #include <net/sock.h> |
29 | #include <net/ip.h> | |
30 | #include <net/icmp.h> | |
d83d8461 | 31 | #include <net/tcp_states.h> |
1da177e4 LT |
32 | #include <linux/udp.h> |
33 | #include <linux/igmp.h> | |
34 | #include <linux/netfilter.h> | |
35 | #include <linux/route.h> | |
36 | #include <linux/mroute.h> | |
2c67e9ac | 37 | #include <net/inet_ecn.h> |
1da177e4 LT |
38 | #include <net/route.h> |
39 | #include <net/xfrm.h> | |
dae50295 | 40 | #include <net/compat.h> |
ad6f939a | 41 | #include <net/checksum.h> |
dfd56b8b | 42 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
43 | #include <net/transp_v6.h> |
44 | #endif | |
35ebf65e | 45 | #include <net/ip_fib.h> |
1da177e4 LT |
46 | |
47 | #include <linux/errqueue.h> | |
7c0f6ba6 | 48 | #include <linux/uaccess.h> |
1da177e4 | 49 | |
1da177e4 LT |
50 | /* |
51 | * SOL_IP control messages. | |
52 | */ | |
53 | ||
54 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
55 | { | |
d826eb14 | 56 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 57 | |
eddc9ec5 | 58 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
59 | |
60 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
61 | } | |
62 | ||
63 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
64 | { | |
eddc9ec5 | 65 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
66 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
67 | } | |
68 | ||
69 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
70 | { | |
eddc9ec5 | 71 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
72 | } |
73 | ||
74 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
75 | { | |
76 | if (IPCB(skb)->opt.optlen == 0) | |
77 | return; | |
78 | ||
eddc9ec5 ACM |
79 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
80 | ip_hdr(skb) + 1); | |
1da177e4 LT |
81 | } |
82 | ||
83 | ||
91ed1e66 PA |
84 | static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, |
85 | struct sk_buff *skb) | |
1da177e4 LT |
86 | { |
87 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 88 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
89 | |
90 | if (IPCB(skb)->opt.optlen == 0) | |
91 | return; | |
92 | ||
91ed1e66 | 93 | if (ip_options_echo(net, opt, skb)) { |
1da177e4 LT |
94 | msg->msg_flags |= MSG_CTRUNC; |
95 | return; | |
96 | } | |
97 | ip_options_undo(opt); | |
98 | ||
99 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
100 | } | |
101 | ||
70ecc248 WB |
102 | static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) |
103 | { | |
104 | int val; | |
105 | ||
106 | if (IPCB(skb)->frag_max_size == 0) | |
107 | return; | |
108 | ||
109 | val = IPCB(skb)->frag_max_size; | |
110 | put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); | |
111 | } | |
112 | ||
ad6f939a | 113 | static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, |
10df8e61 | 114 | int tlen, int offset) |
ad6f939a TH |
115 | { |
116 | __wsum csum = skb->csum; | |
117 | ||
118 | if (skb->ip_summed != CHECKSUM_COMPLETE) | |
119 | return; | |
120 | ||
ca4ef457 PA |
121 | if (offset != 0) { |
122 | int tend_off = skb_transport_offset(skb) + tlen; | |
123 | csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); | |
124 | } | |
ad6f939a TH |
125 | |
126 | put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); | |
127 | } | |
128 | ||
2c7946a7 CZ |
129 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
130 | { | |
131 | char *secdata; | |
dc49c1f9 | 132 | u32 seclen, secid; |
2c7946a7 CZ |
133 | int err; |
134 | ||
dc49c1f9 CZ |
135 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
136 | if (err) | |
137 | return; | |
138 | ||
139 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
140 | if (err) |
141 | return; | |
142 | ||
143 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 144 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
145 | } |
146 | ||
21d1a161 | 147 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
148 | { |
149 | struct sockaddr_in sin; | |
b71d1d42 | 150 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 151 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 | 152 | |
39b2dd76 | 153 | if (skb_transport_offset(skb) + 4 > (int)skb->len) |
e8b2dfe9 BS |
154 | return; |
155 | ||
156 | /* All current transport protocols have the port numbers in the | |
157 | * first four bytes of the transport header and this function is | |
158 | * written with this assumption in mind. | |
159 | */ | |
160 | ||
161 | sin.sin_family = AF_INET; | |
162 | sin.sin_addr.s_addr = iph->daddr; | |
163 | sin.sin_port = ports[1]; | |
164 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
165 | ||
166 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
167 | } | |
1da177e4 | 168 | |
ad959036 PA |
169 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
170 | struct sk_buff *skb, int tlen, int offset) | |
1da177e4 | 171 | { |
ad959036 | 172 | struct inet_sock *inet = inet_sk(sk); |
95c96174 | 173 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
174 | |
175 | /* Ordered by supposed usage frequency */ | |
c44d13d6 | 176 | if (flags & IP_CMSG_PKTINFO) { |
1da177e4 | 177 | ip_cmsg_recv_pktinfo(msg, skb); |
1da177e4 | 178 | |
c44d13d6 TH |
179 | flags &= ~IP_CMSG_PKTINFO; |
180 | if (!flags) | |
181 | return; | |
182 | } | |
183 | ||
184 | if (flags & IP_CMSG_TTL) { | |
1da177e4 | 185 | ip_cmsg_recv_ttl(msg, skb); |
1da177e4 | 186 | |
c44d13d6 TH |
187 | flags &= ~IP_CMSG_TTL; |
188 | if (!flags) | |
189 | return; | |
190 | } | |
191 | ||
192 | if (flags & IP_CMSG_TOS) { | |
1da177e4 | 193 | ip_cmsg_recv_tos(msg, skb); |
1da177e4 | 194 | |
c44d13d6 TH |
195 | flags &= ~IP_CMSG_TOS; |
196 | if (!flags) | |
197 | return; | |
198 | } | |
199 | ||
200 | if (flags & IP_CMSG_RECVOPTS) { | |
1da177e4 | 201 | ip_cmsg_recv_opts(msg, skb); |
1da177e4 | 202 | |
c44d13d6 TH |
203 | flags &= ~IP_CMSG_RECVOPTS; |
204 | if (!flags) | |
205 | return; | |
206 | } | |
207 | ||
208 | if (flags & IP_CMSG_RETOPTS) { | |
91ed1e66 | 209 | ip_cmsg_recv_retopts(sock_net(sk), msg, skb); |
2c7946a7 | 210 | |
c44d13d6 TH |
211 | flags &= ~IP_CMSG_RETOPTS; |
212 | if (!flags) | |
213 | return; | |
214 | } | |
215 | ||
216 | if (flags & IP_CMSG_PASSSEC) { | |
2c7946a7 | 217 | ip_cmsg_recv_security(msg, skb); |
e8b2dfe9 | 218 | |
c44d13d6 TH |
219 | flags &= ~IP_CMSG_PASSSEC; |
220 | if (!flags) | |
221 | return; | |
222 | } | |
223 | ||
ad6f939a | 224 | if (flags & IP_CMSG_ORIGDSTADDR) { |
e8b2dfe9 BS |
225 | ip_cmsg_recv_dstaddr(msg, skb); |
226 | ||
ad6f939a TH |
227 | flags &= ~IP_CMSG_ORIGDSTADDR; |
228 | if (!flags) | |
229 | return; | |
230 | } | |
231 | ||
232 | if (flags & IP_CMSG_CHECKSUM) | |
10df8e61 | 233 | ip_cmsg_recv_checksum(msg, skb, tlen, offset); |
70ecc248 WB |
234 | |
235 | if (flags & IP_CMSG_RECVFRAGSIZE) | |
236 | ip_cmsg_recv_fragsize(msg, skb); | |
1da177e4 | 237 | } |
5961de9f | 238 | EXPORT_SYMBOL(ip_cmsg_recv_offset); |
1da177e4 | 239 | |
24025c46 | 240 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, |
c8e6ad08 | 241 | bool allow_ipv6) |
1da177e4 | 242 | { |
f02db315 | 243 | int err, val; |
1da177e4 | 244 | struct cmsghdr *cmsg; |
24025c46 | 245 | struct net *net = sock_net(sk); |
1da177e4 | 246 | |
f95b414e | 247 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
248 | if (!CMSG_OK(msg, cmsg)) |
249 | return -EINVAL; | |
5337b5b7 | 250 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
251 | if (allow_ipv6 && |
252 | cmsg->cmsg_level == SOL_IPV6 && | |
253 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
254 | struct in6_pktinfo *src_info; | |
255 | ||
256 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
257 | return -EINVAL; | |
258 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
259 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
260 | return -EINVAL; | |
1cbec076 DA |
261 | if (src_info->ipi6_ifindex) |
262 | ipc->oif = src_info->ipi6_ifindex; | |
c8e6ad08 HFS |
263 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; |
264 | continue; | |
265 | } | |
266 | #endif | |
24025c46 | 267 | if (cmsg->cmsg_level == SOL_SOCKET) { |
2632616b ED |
268 | err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); |
269 | if (err) | |
270 | return err; | |
24025c46 SHY |
271 | continue; |
272 | } | |
273 | ||
1da177e4 LT |
274 | if (cmsg->cmsg_level != SOL_IP) |
275 | continue; | |
276 | switch (cmsg->cmsg_type) { | |
277 | case IP_RETOPTS: | |
1ff8cebf | 278 | err = cmsg->cmsg_len - sizeof(struct cmsghdr); |
91948309 ED |
279 | |
280 | /* Our caller is responsible for freeing ipc->opt */ | |
4d52cfbe ED |
281 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
282 | err < 40 ? err : 40); | |
1da177e4 LT |
283 | if (err) |
284 | return err; | |
285 | break; | |
286 | case IP_PKTINFO: | |
287 | { | |
288 | struct in_pktinfo *info; | |
289 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
290 | return -EINVAL; | |
291 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
1cbec076 DA |
292 | if (info->ipi_ifindex) |
293 | ipc->oif = info->ipi_ifindex; | |
1da177e4 LT |
294 | ipc->addr = info->ipi_spec_dst.s_addr; |
295 | break; | |
296 | } | |
f02db315 FF |
297 | case IP_TTL: |
298 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
299 | return -EINVAL; | |
300 | val = *(int *)CMSG_DATA(cmsg); | |
301 | if (val < 1 || val > 255) | |
302 | return -EINVAL; | |
303 | ipc->ttl = val; | |
304 | break; | |
305 | case IP_TOS: | |
e895cdce ED |
306 | if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) |
307 | val = *(int *)CMSG_DATA(cmsg); | |
308 | else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) | |
309 | val = *(u8 *)CMSG_DATA(cmsg); | |
310 | else | |
f02db315 | 311 | return -EINVAL; |
f02db315 FF |
312 | if (val < 0 || val > 255) |
313 | return -EINVAL; | |
314 | ipc->tos = val; | |
315 | ipc->priority = rt_tos2priority(ipc->tos); | |
316 | break; | |
317 | ||
1da177e4 LT |
318 | default: |
319 | return -EINVAL; | |
320 | } | |
321 | } | |
322 | return 0; | |
323 | } | |
324 | ||
592fcb9d | 325 | static void ip_ra_destroy_rcu(struct rcu_head *head) |
66018506 | 326 | { |
592fcb9d ED |
327 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
328 | ||
329 | sock_put(ra->saved_sk); | |
330 | kfree(ra); | |
66018506 | 331 | } |
1da177e4 | 332 | |
4d52cfbe ED |
333 | int ip_ra_control(struct sock *sk, unsigned char on, |
334 | void (*destructor)(struct sock *)) | |
1da177e4 | 335 | { |
43a951e9 ED |
336 | struct ip_ra_chain *ra, *new_ra; |
337 | struct ip_ra_chain __rcu **rap; | |
5796ef75 | 338 | struct net *net = sock_net(sk); |
1da177e4 | 339 | |
c720c7e8 | 340 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
341 | return -EINVAL; |
342 | ||
343 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
344 | ||
d9ff3049 | 345 | mutex_lock(&net->ipv4.ra_mutex); |
5796ef75 | 346 | for (rap = &net->ipv4.ra_chain; |
76d3e153 | 347 | (ra = rcu_dereference_protected(*rap, |
d9ff3049 | 348 | lockdep_is_held(&net->ipv4.ra_mutex))) != NULL; |
43a951e9 | 349 | rap = &ra->next) { |
1da177e4 LT |
350 | if (ra->sk == sk) { |
351 | if (on) { | |
d9ff3049 | 352 | mutex_unlock(&net->ipv4.ra_mutex); |
a51482bd | 353 | kfree(new_ra); |
1da177e4 LT |
354 | return -EADDRINUSE; |
355 | } | |
592fcb9d ED |
356 | /* dont let ip_call_ra_chain() use sk again */ |
357 | ra->sk = NULL; | |
8e380f00 | 358 | RCU_INIT_POINTER(*rap, ra->next); |
d9ff3049 | 359 | mutex_unlock(&net->ipv4.ra_mutex); |
1da177e4 LT |
360 | |
361 | if (ra->destructor) | |
362 | ra->destructor(sk); | |
592fcb9d ED |
363 | /* |
364 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
365 | * period. This guarantee ip_call_ra_chain() dont need | |
366 | * to mess with socket refcounts. | |
367 | */ | |
368 | ra->saved_sk = sk; | |
369 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
370 | return 0; |
371 | } | |
372 | } | |
76d3e153 | 373 | if (!new_ra) { |
d9ff3049 | 374 | mutex_unlock(&net->ipv4.ra_mutex); |
1da177e4 | 375 | return -ENOBUFS; |
76d3e153 | 376 | } |
1da177e4 LT |
377 | new_ra->sk = sk; |
378 | new_ra->destructor = destructor; | |
379 | ||
8e380f00 | 380 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 381 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 382 | sock_hold(sk); |
d9ff3049 | 383 | mutex_unlock(&net->ipv4.ra_mutex); |
1da177e4 LT |
384 | |
385 | return 0; | |
386 | } | |
387 | ||
e905a9ed | 388 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 389 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 390 | { |
1da177e4 LT |
391 | struct sock_exterr_skb *serr; |
392 | ||
1da177e4 LT |
393 | skb = skb_clone(skb, GFP_ATOMIC); |
394 | if (!skb) | |
395 | return; | |
396 | ||
e905a9ed | 397 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
398 | serr->ee.ee_errno = err; |
399 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
400 | serr->ee.ee_type = icmp_hdr(skb)->type; |
401 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
402 | serr->ee.ee_pad = 0; |
403 | serr->ee.ee_info = info; | |
404 | serr->ee.ee_data = 0; | |
88c7664f | 405 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 406 | skb_network_header(skb); |
1da177e4 LT |
407 | serr->port = port; |
408 | ||
00db4124 | 409 | if (skb_pull(skb, payload - skb->data)) { |
bd82393c ACM |
410 | skb_reset_transport_header(skb); |
411 | if (sock_queue_err_skb(sk, skb) == 0) | |
412 | return; | |
413 | } | |
414 | kfree_skb(skb); | |
1da177e4 LT |
415 | } |
416 | ||
0579016e | 417 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
418 | { |
419 | struct inet_sock *inet = inet_sk(sk); | |
420 | struct sock_exterr_skb *serr; | |
421 | struct iphdr *iph; | |
422 | struct sk_buff *skb; | |
423 | ||
424 | if (!inet->recverr) | |
425 | return; | |
426 | ||
427 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
428 | if (!skb) | |
429 | return; | |
430 | ||
2ca9e6f2 ACM |
431 | skb_put(skb, sizeof(struct iphdr)); |
432 | skb_reset_network_header(skb); | |
eddc9ec5 | 433 | iph = ip_hdr(skb); |
1da177e4 LT |
434 | iph->daddr = daddr; |
435 | ||
e905a9ed | 436 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
437 | serr->ee.ee_errno = err; |
438 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 439 | serr->ee.ee_type = 0; |
1da177e4 LT |
440 | serr->ee.ee_code = 0; |
441 | serr->ee.ee_pad = 0; | |
442 | serr->ee.ee_info = info; | |
443 | serr->ee.ee_data = 0; | |
d56f90a7 | 444 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
445 | serr->port = port; |
446 | ||
27a884dc | 447 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 448 | skb_reset_transport_header(skb); |
1da177e4 LT |
449 | |
450 | if (sock_queue_err_skb(sk, skb)) | |
451 | kfree_skb(skb); | |
452 | } | |
453 | ||
34b99df4 JA |
454 | /* For some errors we have valid addr_offset even with zero payload and |
455 | * zero port. Also, addr_offset should be supported if port is set. | |
456 | */ | |
457 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
458 | { | |
459 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
460 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
461 | } | |
462 | ||
c247f053 WB |
463 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
464 | * | |
465 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
466 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
467 | */ | |
468 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
469 | struct sk_buff *skb, | |
470 | int ee_origin) | |
829ae9d6 | 471 | { |
c247f053 WB |
472 | struct in_pktinfo *info; |
473 | ||
474 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
475 | return true; | |
829ae9d6 | 476 | |
c247f053 WB |
477 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
478 | return false; | |
479 | ||
480 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
1862d620 | 481 | * timestamp with egress dev. Not possible for packets without iif |
c247f053 WB |
482 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). |
483 | */ | |
1862d620 WB |
484 | info = PKTINFO_SKB_CB(skb); |
485 | if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || | |
486 | !info->ipi_ifindex) | |
829ae9d6 WB |
487 | return false; |
488 | ||
489 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
829ae9d6 WB |
490 | return true; |
491 | } | |
492 | ||
e905a9ed | 493 | /* |
1da177e4 LT |
494 | * Handle MSG_ERRQUEUE |
495 | */ | |
85fbaa75 | 496 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
497 | { |
498 | struct sock_exterr_skb *serr; | |
364a9e93 | 499 | struct sk_buff *skb; |
342dfc30 | 500 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
501 | struct { |
502 | struct sock_extended_err ee; | |
503 | struct sockaddr_in offender; | |
504 | } errhdr; | |
505 | int err; | |
506 | int copied; | |
507 | ||
7ce875e5 WB |
508 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
509 | ||
1da177e4 | 510 | err = -EAGAIN; |
364a9e93 | 511 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 512 | if (!skb) |
1da177e4 LT |
513 | goto out; |
514 | ||
515 | copied = skb->len; | |
516 | if (copied > len) { | |
517 | msg->msg_flags |= MSG_TRUNC; | |
518 | copied = len; | |
519 | } | |
51f3d02b | 520 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
521 | if (unlikely(err)) { |
522 | kfree_skb(skb); | |
523 | return err; | |
524 | } | |
1da177e4 LT |
525 | sock_recv_timestamp(msg, sk, skb); |
526 | ||
527 | serr = SKB_EXT_ERR(skb); | |
528 | ||
34b99df4 | 529 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 530 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
531 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
532 | serr->addr_offset); | |
1da177e4 LT |
533 | sin->sin_port = serr->port; |
534 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 535 | *addr_len = sizeof(*sin); |
1da177e4 LT |
536 | } |
537 | ||
538 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
539 | sin = &errhdr.offender; | |
f812116b | 540 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 541 | |
c247f053 | 542 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 543 | sin->sin_family = AF_INET; |
eddc9ec5 | 544 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 545 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
546 | ip_cmsg_recv(msg, skb); |
547 | } | |
548 | ||
549 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
550 | ||
551 | /* Now we could try to dump offended packet options */ | |
552 | ||
553 | msg->msg_flags |= MSG_ERRQUEUE; | |
554 | err = copied; | |
555 | ||
960a2628 | 556 | consume_skb(skb); |
1da177e4 LT |
557 | out: |
558 | return err; | |
559 | } | |
560 | ||
561 | ||
562 | /* | |
4d52cfbe ED |
563 | * Socket option code for IP. This is the end of the line after any |
564 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 565 | */ |
baf606d9 MRL |
566 | static bool setsockopt_needs_rtnl(int optname) |
567 | { | |
568 | switch (optname) { | |
569 | case IP_ADD_MEMBERSHIP: | |
570 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 571 | case IP_BLOCK_SOURCE: |
baf606d9 | 572 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
573 | case IP_DROP_SOURCE_MEMBERSHIP: |
574 | case IP_MSFILTER: | |
575 | case IP_UNBLOCK_SOURCE: | |
576 | case MCAST_BLOCK_SOURCE: | |
577 | case MCAST_MSFILTER: | |
baf606d9 | 578 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 579 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 580 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
581 | case MCAST_LEAVE_SOURCE_GROUP: |
582 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
583 | return true; |
584 | } | |
585 | return false; | |
586 | } | |
1da177e4 | 587 | |
3fdadf7d | 588 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 589 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
590 | { |
591 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 592 | struct net *net = sock_net(sk); |
09cb105e | 593 | int val = 0, err; |
baf606d9 | 594 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 595 | |
0c9f79be XW |
596 | switch (optname) { |
597 | case IP_PKTINFO: | |
598 | case IP_RECVTTL: | |
599 | case IP_RECVOPTS: | |
600 | case IP_RECVTOS: | |
601 | case IP_RETOPTS: | |
602 | case IP_TOS: | |
603 | case IP_TTL: | |
604 | case IP_HDRINCL: | |
605 | case IP_MTU_DISCOVER: | |
606 | case IP_RECVERR: | |
607 | case IP_ROUTER_ALERT: | |
608 | case IP_FREEBIND: | |
609 | case IP_PASSSEC: | |
610 | case IP_TRANSPARENT: | |
611 | case IP_MINTTL: | |
612 | case IP_NODEFRAG: | |
90c337da | 613 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
614 | case IP_UNICAST_IF: |
615 | case IP_MULTICAST_TTL: | |
616 | case IP_MULTICAST_ALL: | |
617 | case IP_MULTICAST_LOOP: | |
618 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 619 | case IP_CHECKSUM: |
70ecc248 | 620 | case IP_RECVFRAGSIZE: |
1da177e4 LT |
621 | if (optlen >= sizeof(int)) { |
622 | if (get_user(val, (int __user *) optval)) | |
623 | return -EFAULT; | |
624 | } else if (optlen >= sizeof(char)) { | |
625 | unsigned char ucval; | |
626 | ||
627 | if (get_user(ucval, (unsigned char __user *) optval)) | |
628 | return -EFAULT; | |
629 | val = (int) ucval; | |
630 | } | |
631 | } | |
632 | ||
633 | /* If optlen==0, it is equivalent to val == 0 */ | |
634 | ||
0526947f KT |
635 | if (optname == IP_ROUTER_ALERT) |
636 | return ip_ra_control(sk, val ? 1 : 0, NULL); | |
6a9fb947 | 637 | if (ip_mroute_opt(optname)) |
09cb105e | 638 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
639 | |
640 | err = 0; | |
baf606d9 MRL |
641 | if (needs_rtnl) |
642 | rtnl_lock(); | |
1da177e4 LT |
643 | lock_sock(sk); |
644 | ||
645 | switch (optname) { | |
132adf54 SH |
646 | case IP_OPTIONS: |
647 | { | |
f6d8bd05 ED |
648 | struct ip_options_rcu *old, *opt = NULL; |
649 | ||
65a1c4ff | 650 | if (optlen > 40) |
132adf54 | 651 | goto e_inval; |
3b1e0a65 | 652 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 653 | optval, optlen); |
132adf54 SH |
654 | if (err) |
655 | break; | |
f6d8bd05 | 656 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 657 | lockdep_sock_is_held(sk)); |
132adf54 SH |
658 | if (inet->is_icsk) { |
659 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 660 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
661 | if (sk->sk_family == PF_INET || |
662 | (!((1 << sk->sk_state) & | |
663 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 664 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 665 | #endif |
f6d8bd05 ED |
666 | if (old) |
667 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 668 | if (opt) |
f6d8bd05 | 669 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 670 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 671 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 672 | } |
132adf54 | 673 | #endif |
1da177e4 | 674 | } |
f6d8bd05 ED |
675 | rcu_assign_pointer(inet->inet_opt, opt); |
676 | if (old) | |
605b4afe | 677 | kfree_rcu(old, rcu); |
132adf54 SH |
678 | break; |
679 | } | |
680 | case IP_PKTINFO: | |
681 | if (val) | |
682 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
683 | else | |
684 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
685 | break; | |
686 | case IP_RECVTTL: | |
687 | if (val) | |
688 | inet->cmsg_flags |= IP_CMSG_TTL; | |
689 | else | |
690 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
691 | break; | |
692 | case IP_RECVTOS: | |
693 | if (val) | |
694 | inet->cmsg_flags |= IP_CMSG_TOS; | |
695 | else | |
696 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
697 | break; | |
698 | case IP_RECVOPTS: | |
699 | if (val) | |
700 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
701 | else | |
702 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
703 | break; | |
704 | case IP_RETOPTS: | |
705 | if (val) | |
706 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
707 | else | |
708 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
709 | break; | |
710 | case IP_PASSSEC: | |
711 | if (val) | |
712 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
713 | else | |
714 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
715 | break; | |
e8b2dfe9 BS |
716 | case IP_RECVORIGDSTADDR: |
717 | if (val) | |
718 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
719 | else | |
720 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
721 | break; | |
ad6f939a TH |
722 | case IP_CHECKSUM: |
723 | if (val) { | |
724 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
725 | inet_inc_convert_csum(sk); | |
726 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
727 | } | |
728 | } else { | |
729 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
730 | inet_dec_convert_csum(sk); | |
731 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
732 | } | |
733 | } | |
734 | break; | |
70ecc248 WB |
735 | case IP_RECVFRAGSIZE: |
736 | if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) | |
737 | goto e_inval; | |
738 | if (val) | |
739 | inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; | |
740 | else | |
741 | inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; | |
742 | break; | |
132adf54 SH |
743 | case IP_TOS: /* This sets both TOS and Precedence */ |
744 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
745 | val &= ~INET_ECN_MASK; |
746 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 747 | } |
132adf54 SH |
748 | if (inet->tos != val) { |
749 | inet->tos = val; | |
750 | sk->sk_priority = rt_tos2priority(val); | |
751 | sk_dst_reset(sk); | |
752 | } | |
753 | break; | |
754 | case IP_TTL: | |
4d52cfbe | 755 | if (optlen < 1) |
132adf54 | 756 | goto e_inval; |
c9be4a5c | 757 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
758 | goto e_inval; |
759 | inet->uc_ttl = val; | |
760 | break; | |
761 | case IP_HDRINCL: | |
762 | if (sk->sk_type != SOCK_RAW) { | |
763 | err = -ENOPROTOOPT; | |
2c7946a7 | 764 | break; |
132adf54 SH |
765 | } |
766 | inet->hdrincl = val ? 1 : 0; | |
767 | break; | |
7b2ff18e JO |
768 | case IP_NODEFRAG: |
769 | if (sk->sk_type != SOCK_RAW) { | |
770 | err = -ENOPROTOOPT; | |
771 | break; | |
772 | } | |
773 | inet->nodefrag = val ? 1 : 0; | |
774 | break; | |
90c337da ED |
775 | case IP_BIND_ADDRESS_NO_PORT: |
776 | inet->bind_address_no_port = val ? 1 : 0; | |
777 | break; | |
132adf54 | 778 | case IP_MTU_DISCOVER: |
1b346576 | 779 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
780 | goto e_inval; |
781 | inet->pmtudisc = val; | |
782 | break; | |
783 | case IP_RECVERR: | |
784 | inet->recverr = !!val; | |
785 | if (!val) | |
786 | skb_queue_purge(&sk->sk_error_queue); | |
787 | break; | |
788 | case IP_MULTICAST_TTL: | |
789 | if (sk->sk_type == SOCK_STREAM) | |
790 | goto e_inval; | |
4d52cfbe | 791 | if (optlen < 1) |
132adf54 | 792 | goto e_inval; |
09cb105e | 793 | if (val == -1) |
132adf54 SH |
794 | val = 1; |
795 | if (val < 0 || val > 255) | |
796 | goto e_inval; | |
797 | inet->mc_ttl = val; | |
798 | break; | |
799 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 800 | if (optlen < 1) |
132adf54 SH |
801 | goto e_inval; |
802 | inet->mc_loop = !!val; | |
803 | break; | |
76e21053 EH |
804 | case IP_UNICAST_IF: |
805 | { | |
806 | struct net_device *dev = NULL; | |
807 | int ifindex; | |
9515a2e0 | 808 | int midx; |
76e21053 EH |
809 | |
810 | if (optlen != sizeof(int)) | |
811 | goto e_inval; | |
812 | ||
813 | ifindex = (__force int)ntohl((__force __be32)val); | |
814 | if (ifindex == 0) { | |
815 | inet->uc_index = 0; | |
816 | err = 0; | |
817 | break; | |
818 | } | |
819 | ||
820 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
821 | err = -EADDRNOTAVAIL; | |
822 | if (!dev) | |
823 | break; | |
9515a2e0 DA |
824 | |
825 | midx = l3mdev_master_ifindex(dev); | |
76e21053 EH |
826 | dev_put(dev); |
827 | ||
828 | err = -EINVAL; | |
9515a2e0 DA |
829 | if (sk->sk_bound_dev_if && |
830 | (!midx || midx != sk->sk_bound_dev_if)) | |
76e21053 EH |
831 | break; |
832 | ||
833 | inet->uc_index = ifindex; | |
834 | err = 0; | |
835 | break; | |
836 | } | |
132adf54 SH |
837 | case IP_MULTICAST_IF: |
838 | { | |
839 | struct ip_mreqn mreq; | |
840 | struct net_device *dev = NULL; | |
7bb387c5 | 841 | int midx; |
132adf54 SH |
842 | |
843 | if (sk->sk_type == SOCK_STREAM) | |
844 | goto e_inval; | |
845 | /* | |
846 | * Check the arguments are allowable | |
847 | */ | |
848 | ||
0915921b SW |
849 | if (optlen < sizeof(struct in_addr)) |
850 | goto e_inval; | |
851 | ||
132adf54 SH |
852 | err = -EFAULT; |
853 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 854 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 855 | break; |
132adf54 SH |
856 | } else { |
857 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
858 | if (optlen >= sizeof(struct ip_mreq)) { |
859 | if (copy_from_user(&mreq, optval, | |
860 | sizeof(struct ip_mreq))) | |
861 | break; | |
862 | } else if (optlen >= sizeof(struct in_addr)) { | |
863 | if (copy_from_user(&mreq.imr_address, optval, | |
864 | sizeof(struct in_addr))) | |
865 | break; | |
866 | } | |
132adf54 SH |
867 | } |
868 | ||
869 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 870 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
871 | inet->mc_index = 0; |
872 | inet->mc_addr = 0; | |
873 | err = 0; | |
1da177e4 LT |
874 | break; |
875 | } | |
3b1e0a65 | 876 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 877 | if (dev) |
132adf54 | 878 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 879 | } else |
55b80503 | 880 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 881 | |
1da177e4 | 882 | |
132adf54 SH |
883 | err = -EADDRNOTAVAIL; |
884 | if (!dev) | |
885 | break; | |
7bb387c5 DA |
886 | |
887 | midx = l3mdev_master_ifindex(dev); | |
888 | ||
55b80503 | 889 | dev_put(dev); |
132adf54 SH |
890 | |
891 | err = -EINVAL; | |
892 | if (sk->sk_bound_dev_if && | |
7bb387c5 DA |
893 | mreq.imr_ifindex != sk->sk_bound_dev_if && |
894 | (!midx || midx != sk->sk_bound_dev_if)) | |
132adf54 | 895 | break; |
1da177e4 | 896 | |
132adf54 SH |
897 | inet->mc_index = mreq.imr_ifindex; |
898 | inet->mc_addr = mreq.imr_address.s_addr; | |
899 | err = 0; | |
900 | break; | |
901 | } | |
1da177e4 | 902 | |
132adf54 SH |
903 | case IP_ADD_MEMBERSHIP: |
904 | case IP_DROP_MEMBERSHIP: | |
905 | { | |
906 | struct ip_mreqn mreq; | |
1da177e4 | 907 | |
a96fb49b FL |
908 | err = -EPROTO; |
909 | if (inet_sk(sk)->is_icsk) | |
910 | break; | |
911 | ||
132adf54 SH |
912 | if (optlen < sizeof(struct ip_mreq)) |
913 | goto e_inval; | |
914 | err = -EFAULT; | |
915 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 916 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 917 | break; |
132adf54 SH |
918 | } else { |
919 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 920 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 921 | break; |
132adf54 | 922 | } |
1da177e4 | 923 | |
132adf54 | 924 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 925 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 926 | else |
54ff9ef3 | 927 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
928 | break; |
929 | } | |
930 | case IP_MSFILTER: | |
931 | { | |
132adf54 SH |
932 | struct ip_msfilter *msf; |
933 | ||
934 | if (optlen < IP_MSFILTER_SIZE(0)) | |
935 | goto e_inval; | |
936 | if (optlen > sysctl_optmem_max) { | |
937 | err = -ENOBUFS; | |
1da177e4 LT |
938 | break; |
939 | } | |
a2c841d9 AV |
940 | msf = memdup_user(optval, optlen); |
941 | if (IS_ERR(msf)) { | |
942 | err = PTR_ERR(msf); | |
132adf54 SH |
943 | break; |
944 | } | |
945 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
946 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 947 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
948 | kfree(msf); |
949 | err = -ENOBUFS; | |
950 | break; | |
951 | } | |
952 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
953 | kfree(msf); | |
954 | err = -EINVAL; | |
955 | break; | |
956 | } | |
957 | err = ip_mc_msfilter(sk, msf, 0); | |
958 | kfree(msf); | |
959 | break; | |
960 | } | |
961 | case IP_BLOCK_SOURCE: | |
962 | case IP_UNBLOCK_SOURCE: | |
963 | case IP_ADD_SOURCE_MEMBERSHIP: | |
964 | case IP_DROP_SOURCE_MEMBERSHIP: | |
965 | { | |
966 | struct ip_mreq_source mreqs; | |
967 | int omode, add; | |
1da177e4 | 968 | |
132adf54 SH |
969 | if (optlen != sizeof(struct ip_mreq_source)) |
970 | goto e_inval; | |
971 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 972 | err = -EFAULT; |
1da177e4 LT |
973 | break; |
974 | } | |
132adf54 SH |
975 | if (optname == IP_BLOCK_SOURCE) { |
976 | omode = MCAST_EXCLUDE; | |
977 | add = 1; | |
978 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
979 | omode = MCAST_EXCLUDE; | |
980 | add = 0; | |
981 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
982 | struct ip_mreqn mreq; | |
1da177e4 | 983 | |
132adf54 SH |
984 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
985 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
986 | mreq.imr_ifindex = 0; | |
54ff9ef3 | 987 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 988 | if (err && err != -EADDRINUSE) |
1da177e4 | 989 | break; |
132adf54 SH |
990 | omode = MCAST_INCLUDE; |
991 | add = 1; | |
992 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
993 | omode = MCAST_INCLUDE; | |
994 | add = 0; | |
995 | } | |
996 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
997 | break; | |
998 | } | |
999 | case MCAST_JOIN_GROUP: | |
1000 | case MCAST_LEAVE_GROUP: | |
1001 | { | |
1002 | struct group_req greq; | |
1003 | struct sockaddr_in *psin; | |
1004 | struct ip_mreqn mreq; | |
1005 | ||
1006 | if (optlen < sizeof(struct group_req)) | |
1007 | goto e_inval; | |
1008 | err = -EFAULT; | |
1009 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
1010 | break; | |
1011 | psin = (struct sockaddr_in *)&greq.gr_group; | |
1012 | if (psin->sin_family != AF_INET) | |
1013 | goto e_inval; | |
1014 | memset(&mreq, 0, sizeof(mreq)); | |
1015 | mreq.imr_multiaddr = psin->sin_addr; | |
1016 | mreq.imr_ifindex = greq.gr_interface; | |
1017 | ||
1018 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 1019 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1020 | else |
54ff9ef3 | 1021 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1022 | break; |
1023 | } | |
1024 | case MCAST_JOIN_SOURCE_GROUP: | |
1025 | case MCAST_LEAVE_SOURCE_GROUP: | |
1026 | case MCAST_BLOCK_SOURCE: | |
1027 | case MCAST_UNBLOCK_SOURCE: | |
1028 | { | |
1029 | struct group_source_req greqs; | |
1030 | struct ip_mreq_source mreqs; | |
1031 | struct sockaddr_in *psin; | |
1032 | int omode, add; | |
1033 | ||
1034 | if (optlen != sizeof(struct group_source_req)) | |
1035 | goto e_inval; | |
1036 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1037 | err = -EFAULT; |
1da177e4 LT |
1038 | break; |
1039 | } | |
132adf54 SH |
1040 | if (greqs.gsr_group.ss_family != AF_INET || |
1041 | greqs.gsr_source.ss_family != AF_INET) { | |
1042 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1043 | break; |
1044 | } | |
132adf54 SH |
1045 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1046 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1047 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1048 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1049 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1050 | ||
1051 | if (optname == MCAST_BLOCK_SOURCE) { | |
1052 | omode = MCAST_EXCLUDE; | |
1053 | add = 1; | |
1054 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1055 | omode = MCAST_EXCLUDE; | |
1056 | add = 0; | |
1057 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1058 | struct ip_mreqn mreq; |
1059 | ||
132adf54 | 1060 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1061 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1062 | mreq.imr_address.s_addr = 0; |
1063 | mreq.imr_ifindex = greqs.gsr_interface; | |
54ff9ef3 | 1064 | err = ip_mc_join_group(sk, &mreq); |
132adf54 SH |
1065 | if (err && err != -EADDRINUSE) |
1066 | break; | |
1067 | greqs.gsr_interface = mreq.imr_ifindex; | |
1068 | omode = MCAST_INCLUDE; | |
1069 | add = 1; | |
1070 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1071 | omode = MCAST_INCLUDE; | |
1072 | add = 0; | |
1073 | } | |
1074 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1075 | greqs.gsr_interface); | |
1076 | break; | |
1077 | } | |
1078 | case MCAST_MSFILTER: | |
1079 | { | |
132adf54 SH |
1080 | struct sockaddr_in *psin; |
1081 | struct ip_msfilter *msf = NULL; | |
1082 | struct group_filter *gsf = NULL; | |
1083 | int msize, i, ifindex; | |
1084 | ||
1085 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1086 | goto e_inval; | |
1087 | if (optlen > sysctl_optmem_max) { | |
1088 | err = -ENOBUFS; | |
1da177e4 LT |
1089 | break; |
1090 | } | |
a2c841d9 AV |
1091 | gsf = memdup_user(optval, optlen); |
1092 | if (IS_ERR(gsf)) { | |
1093 | err = PTR_ERR(gsf); | |
1da177e4 LT |
1094 | break; |
1095 | } | |
4d52cfbe | 1096 | |
132adf54 SH |
1097 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1098 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1099 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1100 | err = -ENOBUFS; |
1101 | goto mc_msf_out; | |
1102 | } | |
1103 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1104 | err = -EINVAL; | |
1105 | goto mc_msf_out; | |
1106 | } | |
1107 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1108 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1109 | if (!msf) { |
132adf54 SH |
1110 | err = -ENOBUFS; |
1111 | goto mc_msf_out; | |
1112 | } | |
1113 | ifindex = gsf->gf_interface; | |
1114 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1115 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1116 | err = -EADDRNOTAVAIL; |
132adf54 | 1117 | goto mc_msf_out; |
1da177e4 | 1118 | } |
132adf54 SH |
1119 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1120 | msf->imsf_interface = 0; | |
1121 | msf->imsf_fmode = gsf->gf_fmode; | |
1122 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1123 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1124 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1125 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1126 | |
132adf54 SH |
1127 | if (psin->sin_family != AF_INET) |
1128 | goto mc_msf_out; | |
1129 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1130 | } | |
1131 | kfree(gsf); | |
1132 | gsf = NULL; | |
1133 | ||
1134 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1135 | mc_msf_out: |
132adf54 SH |
1136 | kfree(msf); |
1137 | kfree(gsf); | |
1138 | break; | |
1139 | } | |
f771bef9 NS |
1140 | case IP_MULTICAST_ALL: |
1141 | if (optlen < 1) | |
1142 | goto e_inval; | |
1143 | if (val != 0 && val != 1) | |
1144 | goto e_inval; | |
1145 | inet->mc_all = val; | |
1146 | break; | |
132adf54 SH |
1147 | |
1148 | case IP_FREEBIND: | |
4d52cfbe | 1149 | if (optlen < 1) |
132adf54 SH |
1150 | goto e_inval; |
1151 | inet->freebind = !!val; | |
1152 | break; | |
1153 | ||
1154 | case IP_IPSEC_POLICY: | |
1155 | case IP_XFRM_POLICY: | |
1156 | err = -EPERM; | |
52e804c6 | 1157 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1158 | break; |
132adf54 SH |
1159 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1160 | break; | |
1da177e4 | 1161 | |
f5715aea | 1162 | case IP_TRANSPARENT: |
52e804c6 EB |
1163 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1164 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1165 | err = -EPERM; |
1166 | break; | |
1167 | } | |
1168 | if (optlen < 1) | |
1169 | goto e_inval; | |
1170 | inet->transparent = !!val; | |
1171 | break; | |
1172 | ||
d218d111 SH |
1173 | case IP_MINTTL: |
1174 | if (optlen < 1) | |
1175 | goto e_inval; | |
1176 | if (val < 0 || val > 255) | |
1177 | goto e_inval; | |
1178 | inet->min_ttl = val; | |
1179 | break; | |
1180 | ||
132adf54 SH |
1181 | default: |
1182 | err = -ENOPROTOOPT; | |
1183 | break; | |
1da177e4 LT |
1184 | } |
1185 | release_sock(sk); | |
baf606d9 MRL |
1186 | if (needs_rtnl) |
1187 | rtnl_unlock(); | |
1da177e4 LT |
1188 | return err; |
1189 | ||
1190 | e_inval: | |
1191 | release_sock(sk); | |
baf606d9 MRL |
1192 | if (needs_rtnl) |
1193 | rtnl_unlock(); | |
1da177e4 LT |
1194 | return -EINVAL; |
1195 | } | |
1196 | ||
f84af32c | 1197 | /** |
829ae9d6 | 1198 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1199 | * @sk: socket |
1200 | * @skb: buffer | |
1201 | * | |
35ebf65e DM |
1202 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1203 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1204 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1205 | */ |
fbf8866d | 1206 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1207 | { |
d826eb14 | 1208 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1209 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1210 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1211 | |
4b261c75 | 1212 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1213 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1214 | * which has interface index (iif) as the first member of the | |
1215 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1216 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
f0c16ba8 WZ |
1217 | * element so the iif is picked up from the prior IPCB. If iif |
1218 | * is the loopback interface, then return the sending interface | |
1219 | * (e.g., process binds socket to eth0 for Tx which is | |
1220 | * redirected to loopback in the rtable/dst). | |
0b922b7a | 1221 | */ |
cbea8f02 DA |
1222 | struct rtable *rt = skb_rtable(skb); |
1223 | bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); | |
1224 | ||
1225 | if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) | |
f0c16ba8 | 1226 | pktinfo->ipi_ifindex = inet_iif(skb); |
cbea8f02 DA |
1227 | else if (l3slave && rt && rt->rt_iif) |
1228 | pktinfo->ipi_ifindex = rt->rt_iif; | |
f0c16ba8 | 1229 | |
35ebf65e | 1230 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1231 | } else { |
1232 | pktinfo->ipi_ifindex = 0; | |
1233 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1234 | } | |
61a1030b | 1235 | skb_dst_drop(skb); |
f84af32c | 1236 | } |
f84af32c | 1237 | |
3fdadf7d | 1238 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1239 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1240 | { |
1241 | int err; | |
1242 | ||
1243 | if (level != SOL_IP) | |
1244 | return -ENOPROTOOPT; | |
1245 | ||
1246 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1247 | #ifdef CONFIG_NETFILTER | |
1248 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1249 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1250 | optname != IP_IPSEC_POLICY && |
1251 | optname != IP_XFRM_POLICY && | |
3f34cfae | 1252 | !ip_mroute_opt(optname)) |
3fdadf7d | 1253 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
3fdadf7d DM |
1254 | #endif |
1255 | return err; | |
1256 | } | |
4d52cfbe | 1257 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1258 | |
1259 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1260 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1261 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1262 | { |
1263 | int err; | |
1264 | ||
1265 | if (level != SOL_IP) | |
1266 | return -ENOPROTOOPT; | |
1267 | ||
dae50295 DS |
1268 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1269 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1270 | ip_setsockopt); | |
1271 | ||
3fdadf7d DM |
1272 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1273 | #ifdef CONFIG_NETFILTER | |
1274 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1275 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1276 | optname != IP_IPSEC_POLICY && |
1277 | optname != IP_XFRM_POLICY && | |
3f34cfae PA |
1278 | !ip_mroute_opt(optname)) |
1279 | err = compat_nf_setsockopt(sk, PF_INET, optname, optval, | |
1280 | optlen); | |
3fdadf7d DM |
1281 | #endif |
1282 | return err; | |
1283 | } | |
543d9cfe | 1284 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1285 | #endif |
1286 | ||
1da177e4 | 1287 | /* |
4d52cfbe ED |
1288 | * Get the options. Note for future reference. The GET of IP options gets |
1289 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1290 | */ |
1291 | ||
87e9f031 WC |
1292 | static bool getsockopt_needs_rtnl(int optname) |
1293 | { | |
1294 | switch (optname) { | |
1295 | case IP_MSFILTER: | |
1296 | case MCAST_MSFILTER: | |
1297 | return true; | |
1298 | } | |
1299 | return false; | |
1300 | } | |
1301 | ||
3fdadf7d | 1302 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1303 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1304 | { |
1305 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1306 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1307 | int val, err = 0; | |
1da177e4 | 1308 | int len; |
e905a9ed | 1309 | |
132adf54 | 1310 | if (level != SOL_IP) |
1da177e4 LT |
1311 | return -EOPNOTSUPP; |
1312 | ||
6a9fb947 | 1313 | if (ip_mroute_opt(optname)) |
09cb105e | 1314 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1315 | |
09cb105e | 1316 | if (get_user(len, optlen)) |
1da177e4 | 1317 | return -EFAULT; |
132adf54 | 1318 | if (len < 0) |
1da177e4 | 1319 | return -EINVAL; |
e905a9ed | 1320 | |
87e9f031 WC |
1321 | if (needs_rtnl) |
1322 | rtnl_lock(); | |
1da177e4 LT |
1323 | lock_sock(sk); |
1324 | ||
132adf54 SH |
1325 | switch (optname) { |
1326 | case IP_OPTIONS: | |
1327 | { | |
1328 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1329 | struct ip_options *opt = (struct ip_options *)optbuf; |
1330 | struct ip_options_rcu *inet_opt; | |
1331 | ||
1332 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1333 | lockdep_sock_is_held(sk)); |
132adf54 | 1334 | opt->optlen = 0; |
f6d8bd05 ED |
1335 | if (inet_opt) |
1336 | memcpy(optbuf, &inet_opt->opt, | |
1337 | sizeof(struct ip_options) + | |
1338 | inet_opt->opt.optlen); | |
132adf54 SH |
1339 | release_sock(sk); |
1340 | ||
1341 | if (opt->optlen == 0) | |
1342 | return put_user(0, optlen); | |
1343 | ||
1344 | ip_options_undo(opt); | |
1345 | ||
1346 | len = min_t(unsigned int, len, opt->optlen); | |
1347 | if (put_user(len, optlen)) | |
1348 | return -EFAULT; | |
1349 | if (copy_to_user(optval, opt->__data, len)) | |
1350 | return -EFAULT; | |
1351 | return 0; | |
1352 | } | |
1353 | case IP_PKTINFO: | |
1354 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1355 | break; | |
1356 | case IP_RECVTTL: | |
1357 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1358 | break; | |
1359 | case IP_RECVTOS: | |
1360 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1361 | break; | |
1362 | case IP_RECVOPTS: | |
1363 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1364 | break; | |
1365 | case IP_RETOPTS: | |
1366 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1367 | break; | |
1368 | case IP_PASSSEC: | |
1369 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1370 | break; | |
e8b2dfe9 BS |
1371 | case IP_RECVORIGDSTADDR: |
1372 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1373 | break; | |
ad6f939a TH |
1374 | case IP_CHECKSUM: |
1375 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1376 | break; | |
70ecc248 WB |
1377 | case IP_RECVFRAGSIZE: |
1378 | val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; | |
1379 | break; | |
132adf54 SH |
1380 | case IP_TOS: |
1381 | val = inet->tos; | |
1382 | break; | |
1383 | case IP_TTL: | |
fa50d974 NB |
1384 | { |
1385 | struct net *net = sock_net(sk); | |
132adf54 | 1386 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1387 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1388 | inet->uc_ttl); |
1389 | break; | |
fa50d974 | 1390 | } |
132adf54 SH |
1391 | case IP_HDRINCL: |
1392 | val = inet->hdrincl; | |
1393 | break; | |
a89b4763 MK |
1394 | case IP_NODEFRAG: |
1395 | val = inet->nodefrag; | |
1396 | break; | |
90c337da ED |
1397 | case IP_BIND_ADDRESS_NO_PORT: |
1398 | val = inet->bind_address_no_port; | |
1399 | break; | |
132adf54 SH |
1400 | case IP_MTU_DISCOVER: |
1401 | val = inet->pmtudisc; | |
1402 | break; | |
1403 | case IP_MTU: | |
1404 | { | |
1405 | struct dst_entry *dst; | |
1406 | val = 0; | |
1407 | dst = sk_dst_get(sk); | |
1408 | if (dst) { | |
1409 | val = dst_mtu(dst); | |
1410 | dst_release(dst); | |
1da177e4 | 1411 | } |
132adf54 | 1412 | if (!val) { |
1da177e4 | 1413 | release_sock(sk); |
132adf54 | 1414 | return -ENOTCONN; |
1da177e4 | 1415 | } |
132adf54 SH |
1416 | break; |
1417 | } | |
1418 | case IP_RECVERR: | |
1419 | val = inet->recverr; | |
1420 | break; | |
1421 | case IP_MULTICAST_TTL: | |
1422 | val = inet->mc_ttl; | |
1423 | break; | |
1424 | case IP_MULTICAST_LOOP: | |
1425 | val = inet->mc_loop; | |
1426 | break; | |
76e21053 EH |
1427 | case IP_UNICAST_IF: |
1428 | val = (__force int)htonl((__u32) inet->uc_index); | |
1429 | break; | |
132adf54 SH |
1430 | case IP_MULTICAST_IF: |
1431 | { | |
1432 | struct in_addr addr; | |
1433 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1434 | addr.s_addr = inet->mc_addr; | |
1435 | release_sock(sk); | |
1da177e4 | 1436 | |
132adf54 SH |
1437 | if (put_user(len, optlen)) |
1438 | return -EFAULT; | |
1439 | if (copy_to_user(optval, &addr, len)) | |
1440 | return -EFAULT; | |
1441 | return 0; | |
1442 | } | |
1443 | case IP_MSFILTER: | |
1444 | { | |
1445 | struct ip_msfilter msf; | |
132adf54 SH |
1446 | |
1447 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1448 | err = -EINVAL; |
1449 | goto out; | |
1da177e4 | 1450 | } |
132adf54 | 1451 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1452 | err = -EFAULT; |
1453 | goto out; | |
1da177e4 | 1454 | } |
132adf54 SH |
1455 | err = ip_mc_msfget(sk, &msf, |
1456 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1457 | goto out; |
132adf54 SH |
1458 | } |
1459 | case MCAST_MSFILTER: | |
1460 | { | |
1461 | struct group_filter gsf; | |
1da177e4 | 1462 | |
132adf54 | 1463 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1464 | err = -EINVAL; |
1465 | goto out; | |
132adf54 SH |
1466 | } |
1467 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1468 | err = -EFAULT; |
1469 | goto out; | |
132adf54 SH |
1470 | } |
1471 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1472 | (struct group_filter __user *)optval, |
1473 | optlen); | |
87e9f031 | 1474 | goto out; |
132adf54 | 1475 | } |
f771bef9 NS |
1476 | case IP_MULTICAST_ALL: |
1477 | val = inet->mc_all; | |
1478 | break; | |
132adf54 SH |
1479 | case IP_PKTOPTIONS: |
1480 | { | |
1481 | struct msghdr msg; | |
1da177e4 | 1482 | |
132adf54 | 1483 | release_sock(sk); |
1da177e4 | 1484 | |
132adf54 SH |
1485 | if (sk->sk_type != SOCK_STREAM) |
1486 | return -ENOPROTOOPT; | |
1da177e4 | 1487 | |
c54a5e02 | 1488 | msg.msg_control = (__force void *) optval; |
132adf54 | 1489 | msg.msg_controllen = len; |
dd23198e | 1490 | msg.msg_flags = flags; |
1da177e4 | 1491 | |
132adf54 SH |
1492 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1493 | struct in_pktinfo info; | |
1494 | ||
c720c7e8 ED |
1495 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1496 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1497 | info.ipi_ifindex = inet->mc_index; |
1498 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1499 | } |
132adf54 SH |
1500 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1501 | int hlim = inet->mc_ttl; | |
1502 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1503 | } | |
4c507d28 JB |
1504 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1505 | int tos = inet->rcv_tos; | |
1506 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1507 | } | |
132adf54 SH |
1508 | len -= msg.msg_controllen; |
1509 | return put_user(len, optlen); | |
1510 | } | |
1511 | case IP_FREEBIND: | |
1512 | val = inet->freebind; | |
1513 | break; | |
f5715aea KK |
1514 | case IP_TRANSPARENT: |
1515 | val = inet->transparent; | |
1516 | break; | |
d218d111 SH |
1517 | case IP_MINTTL: |
1518 | val = inet->min_ttl; | |
1519 | break; | |
132adf54 SH |
1520 | default: |
1521 | release_sock(sk); | |
1522 | return -ENOPROTOOPT; | |
1da177e4 LT |
1523 | } |
1524 | release_sock(sk); | |
e905a9ed | 1525 | |
4d52cfbe | 1526 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1527 | unsigned char ucval = (unsigned char)val; |
1528 | len = 1; | |
132adf54 | 1529 | if (put_user(len, optlen)) |
1da177e4 | 1530 | return -EFAULT; |
09cb105e | 1531 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1532 | return -EFAULT; |
1533 | } else { | |
1534 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1535 | if (put_user(len, optlen)) |
1da177e4 | 1536 | return -EFAULT; |
09cb105e | 1537 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1538 | return -EFAULT; |
1539 | } | |
1540 | return 0; | |
87e9f031 WC |
1541 | |
1542 | out: | |
1543 | release_sock(sk); | |
1544 | if (needs_rtnl) | |
1545 | rtnl_unlock(); | |
1546 | return err; | |
1da177e4 LT |
1547 | } |
1548 | ||
3fdadf7d | 1549 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1550 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1551 | { |
1552 | int err; | |
1553 | ||
dd23198e | 1554 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1555 | #ifdef CONFIG_NETFILTER |
1556 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1557 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1558 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1559 | int len; |
3fdadf7d | 1560 | |
09cb105e | 1561 | if (get_user(len, optlen)) |
3fdadf7d DM |
1562 | return -EFAULT; |
1563 | ||
01ea306f | 1564 | err = nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1565 | if (err >= 0) |
1566 | err = put_user(len, optlen); | |
1567 | return err; | |
1568 | } | |
1569 | #endif | |
1570 | return err; | |
1571 | } | |
4d52cfbe | 1572 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1573 | |
1574 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1575 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1576 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1577 | { |
42908c69 DS |
1578 | int err; |
1579 | ||
1580 | if (optname == MCAST_MSFILTER) | |
1581 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1582 | ip_getsockopt); | |
1583 | ||
dd23198e DB |
1584 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1585 | MSG_CMSG_COMPAT); | |
42908c69 | 1586 | |
3fdadf7d DM |
1587 | #ifdef CONFIG_NETFILTER |
1588 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1589 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1590 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1591 | int len; |
3fdadf7d | 1592 | |
543d9cfe | 1593 | if (get_user(len, optlen)) |
3fdadf7d DM |
1594 | return -EFAULT; |
1595 | ||
543d9cfe | 1596 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1597 | if (err >= 0) |
1598 | err = put_user(len, optlen); | |
1599 | return err; | |
1600 | } | |
1601 | #endif | |
1602 | return err; | |
1603 | } | |
543d9cfe | 1604 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1605 | #endif |