]>
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; | |
e6ec2b08 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); | |
e6ec2b08 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 | ||
325 | ||
326 | /* Special input handler for packets caught by router alert option. | |
327 | They are selected only by protocol field, and then processed likely | |
328 | local ones; but only if someone wants them! Otherwise, router | |
329 | not running rsvpd will kill RSVP. | |
330 | ||
331 | It is user level problem, what it will make with them. | |
332 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
333 | but receiver should be enough clever f.e. to forward mtrace requests, | |
334 | sent to multicast group to reach destination designated router. | |
335 | */ | |
43a951e9 | 336 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 | 337 | |
592fcb9d ED |
338 | |
339 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 340 | { |
592fcb9d ED |
341 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
342 | ||
343 | sock_put(ra->saved_sk); | |
344 | kfree(ra); | |
66018506 | 345 | } |
1da177e4 | 346 | |
4d52cfbe ED |
347 | int ip_ra_control(struct sock *sk, unsigned char on, |
348 | void (*destructor)(struct sock *)) | |
1da177e4 | 349 | { |
43a951e9 ED |
350 | struct ip_ra_chain *ra, *new_ra; |
351 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 352 | |
c720c7e8 | 353 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
354 | return -EINVAL; |
355 | ||
356 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
357 | ||
43a951e9 | 358 | for (rap = &ip_ra_chain; |
ba3f571d | 359 | (ra = rtnl_dereference(*rap)) != NULL; |
43a951e9 | 360 | rap = &ra->next) { |
1da177e4 LT |
361 | if (ra->sk == sk) { |
362 | if (on) { | |
a51482bd | 363 | kfree(new_ra); |
1da177e4 LT |
364 | return -EADDRINUSE; |
365 | } | |
592fcb9d ED |
366 | /* dont let ip_call_ra_chain() use sk again */ |
367 | ra->sk = NULL; | |
8e380f00 | 368 | RCU_INIT_POINTER(*rap, ra->next); |
1da177e4 LT |
369 | |
370 | if (ra->destructor) | |
371 | ra->destructor(sk); | |
592fcb9d ED |
372 | /* |
373 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
374 | * period. This guarantee ip_call_ra_chain() dont need | |
375 | * to mess with socket refcounts. | |
376 | */ | |
377 | ra->saved_sk = sk; | |
378 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
379 | return 0; |
380 | } | |
381 | } | |
ba3f571d | 382 | if (!new_ra) |
1da177e4 | 383 | return -ENOBUFS; |
1da177e4 LT |
384 | new_ra->sk = sk; |
385 | new_ra->destructor = destructor; | |
386 | ||
8e380f00 | 387 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 388 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 389 | sock_hold(sk); |
1da177e4 LT |
390 | |
391 | return 0; | |
392 | } | |
393 | ||
e905a9ed | 394 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 395 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 396 | { |
1da177e4 LT |
397 | struct sock_exterr_skb *serr; |
398 | ||
1da177e4 LT |
399 | skb = skb_clone(skb, GFP_ATOMIC); |
400 | if (!skb) | |
401 | return; | |
402 | ||
e905a9ed | 403 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
404 | serr->ee.ee_errno = err; |
405 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
406 | serr->ee.ee_type = icmp_hdr(skb)->type; |
407 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
408 | serr->ee.ee_pad = 0; |
409 | serr->ee.ee_info = info; | |
410 | serr->ee.ee_data = 0; | |
88c7664f | 411 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 412 | skb_network_header(skb); |
1da177e4 LT |
413 | serr->port = port; |
414 | ||
00db4124 | 415 | if (skb_pull(skb, payload - skb->data)) { |
bd82393c ACM |
416 | skb_reset_transport_header(skb); |
417 | if (sock_queue_err_skb(sk, skb) == 0) | |
418 | return; | |
419 | } | |
420 | kfree_skb(skb); | |
1da177e4 LT |
421 | } |
422 | ||
0579016e | 423 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
424 | { |
425 | struct inet_sock *inet = inet_sk(sk); | |
426 | struct sock_exterr_skb *serr; | |
427 | struct iphdr *iph; | |
428 | struct sk_buff *skb; | |
429 | ||
430 | if (!inet->recverr) | |
431 | return; | |
432 | ||
433 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
434 | if (!skb) | |
435 | return; | |
436 | ||
2ca9e6f2 ACM |
437 | skb_put(skb, sizeof(struct iphdr)); |
438 | skb_reset_network_header(skb); | |
eddc9ec5 | 439 | iph = ip_hdr(skb); |
1da177e4 LT |
440 | iph->daddr = daddr; |
441 | ||
e905a9ed | 442 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
443 | serr->ee.ee_errno = err; |
444 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 445 | serr->ee.ee_type = 0; |
1da177e4 LT |
446 | serr->ee.ee_code = 0; |
447 | serr->ee.ee_pad = 0; | |
448 | serr->ee.ee_info = info; | |
449 | serr->ee.ee_data = 0; | |
d56f90a7 | 450 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
451 | serr->port = port; |
452 | ||
27a884dc | 453 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 454 | skb_reset_transport_header(skb); |
1da177e4 LT |
455 | |
456 | if (sock_queue_err_skb(sk, skb)) | |
457 | kfree_skb(skb); | |
458 | } | |
459 | ||
34b99df4 JA |
460 | /* For some errors we have valid addr_offset even with zero payload and |
461 | * zero port. Also, addr_offset should be supported if port is set. | |
462 | */ | |
463 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
464 | { | |
465 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
466 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
467 | } | |
468 | ||
c247f053 WB |
469 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
470 | * | |
471 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
472 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
473 | */ | |
474 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
475 | struct sk_buff *skb, | |
476 | int ee_origin) | |
829ae9d6 | 477 | { |
c247f053 WB |
478 | struct in_pktinfo *info; |
479 | ||
480 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
481 | return true; | |
829ae9d6 | 482 | |
c247f053 WB |
483 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
484 | return false; | |
485 | ||
486 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
1862d620 | 487 | * timestamp with egress dev. Not possible for packets without iif |
c247f053 WB |
488 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). |
489 | */ | |
1862d620 WB |
490 | info = PKTINFO_SKB_CB(skb); |
491 | if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || | |
492 | !info->ipi_ifindex) | |
829ae9d6 WB |
493 | return false; |
494 | ||
495 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
829ae9d6 WB |
496 | return true; |
497 | } | |
498 | ||
e905a9ed | 499 | /* |
1da177e4 LT |
500 | * Handle MSG_ERRQUEUE |
501 | */ | |
85fbaa75 | 502 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
503 | { |
504 | struct sock_exterr_skb *serr; | |
364a9e93 | 505 | struct sk_buff *skb; |
342dfc30 | 506 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
507 | struct { |
508 | struct sock_extended_err ee; | |
509 | struct sockaddr_in offender; | |
510 | } errhdr; | |
511 | int err; | |
512 | int copied; | |
513 | ||
7ce875e5 WB |
514 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
515 | ||
1da177e4 | 516 | err = -EAGAIN; |
364a9e93 | 517 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 518 | if (!skb) |
1da177e4 LT |
519 | goto out; |
520 | ||
521 | copied = skb->len; | |
522 | if (copied > len) { | |
523 | msg->msg_flags |= MSG_TRUNC; | |
524 | copied = len; | |
525 | } | |
51f3d02b | 526 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
527 | if (unlikely(err)) { |
528 | kfree_skb(skb); | |
529 | return err; | |
530 | } | |
1da177e4 LT |
531 | sock_recv_timestamp(msg, sk, skb); |
532 | ||
533 | serr = SKB_EXT_ERR(skb); | |
534 | ||
34b99df4 | 535 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 536 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
537 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
538 | serr->addr_offset); | |
1da177e4 LT |
539 | sin->sin_port = serr->port; |
540 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 541 | *addr_len = sizeof(*sin); |
1da177e4 LT |
542 | } |
543 | ||
544 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
545 | sin = &errhdr.offender; | |
f812116b | 546 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 547 | |
c247f053 | 548 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 549 | sin->sin_family = AF_INET; |
eddc9ec5 | 550 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 551 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
552 | ip_cmsg_recv(msg, skb); |
553 | } | |
554 | ||
555 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
556 | ||
557 | /* Now we could try to dump offended packet options */ | |
558 | ||
559 | msg->msg_flags |= MSG_ERRQUEUE; | |
560 | err = copied; | |
561 | ||
960a2628 | 562 | consume_skb(skb); |
1da177e4 LT |
563 | out: |
564 | return err; | |
565 | } | |
566 | ||
567 | ||
568 | /* | |
4d52cfbe ED |
569 | * Socket option code for IP. This is the end of the line after any |
570 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 571 | */ |
baf606d9 MRL |
572 | static bool setsockopt_needs_rtnl(int optname) |
573 | { | |
574 | switch (optname) { | |
575 | case IP_ADD_MEMBERSHIP: | |
576 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 577 | case IP_BLOCK_SOURCE: |
baf606d9 | 578 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
579 | case IP_DROP_SOURCE_MEMBERSHIP: |
580 | case IP_MSFILTER: | |
581 | case IP_UNBLOCK_SOURCE: | |
582 | case MCAST_BLOCK_SOURCE: | |
583 | case MCAST_MSFILTER: | |
baf606d9 | 584 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 585 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 586 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
587 | case MCAST_LEAVE_SOURCE_GROUP: |
588 | case MCAST_UNBLOCK_SOURCE: | |
1215e51e | 589 | case IP_ROUTER_ALERT: |
baf606d9 MRL |
590 | return true; |
591 | } | |
592 | return false; | |
593 | } | |
1da177e4 | 594 | |
3fdadf7d | 595 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 596 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
597 | { |
598 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 599 | struct net *net = sock_net(sk); |
09cb105e | 600 | int val = 0, err; |
baf606d9 | 601 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 602 | |
0c9f79be XW |
603 | switch (optname) { |
604 | case IP_PKTINFO: | |
605 | case IP_RECVTTL: | |
606 | case IP_RECVOPTS: | |
607 | case IP_RECVTOS: | |
608 | case IP_RETOPTS: | |
609 | case IP_TOS: | |
610 | case IP_TTL: | |
611 | case IP_HDRINCL: | |
612 | case IP_MTU_DISCOVER: | |
613 | case IP_RECVERR: | |
614 | case IP_ROUTER_ALERT: | |
615 | case IP_FREEBIND: | |
616 | case IP_PASSSEC: | |
617 | case IP_TRANSPARENT: | |
618 | case IP_MINTTL: | |
619 | case IP_NODEFRAG: | |
90c337da | 620 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
621 | case IP_UNICAST_IF: |
622 | case IP_MULTICAST_TTL: | |
623 | case IP_MULTICAST_ALL: | |
624 | case IP_MULTICAST_LOOP: | |
625 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 626 | case IP_CHECKSUM: |
70ecc248 | 627 | case IP_RECVFRAGSIZE: |
1da177e4 LT |
628 | if (optlen >= sizeof(int)) { |
629 | if (get_user(val, (int __user *) optval)) | |
630 | return -EFAULT; | |
631 | } else if (optlen >= sizeof(char)) { | |
632 | unsigned char ucval; | |
633 | ||
634 | if (get_user(ucval, (unsigned char __user *) optval)) | |
635 | return -EFAULT; | |
636 | val = (int) ucval; | |
637 | } | |
638 | } | |
639 | ||
640 | /* If optlen==0, it is equivalent to val == 0 */ | |
641 | ||
6a9fb947 | 642 | if (ip_mroute_opt(optname)) |
09cb105e | 643 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
644 | |
645 | err = 0; | |
baf606d9 MRL |
646 | if (needs_rtnl) |
647 | rtnl_lock(); | |
1da177e4 LT |
648 | lock_sock(sk); |
649 | ||
650 | switch (optname) { | |
132adf54 SH |
651 | case IP_OPTIONS: |
652 | { | |
f6d8bd05 ED |
653 | struct ip_options_rcu *old, *opt = NULL; |
654 | ||
65a1c4ff | 655 | if (optlen > 40) |
132adf54 | 656 | goto e_inval; |
3b1e0a65 | 657 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 658 | optval, optlen); |
132adf54 SH |
659 | if (err) |
660 | break; | |
f6d8bd05 | 661 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 662 | lockdep_sock_is_held(sk)); |
132adf54 SH |
663 | if (inet->is_icsk) { |
664 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 665 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
666 | if (sk->sk_family == PF_INET || |
667 | (!((1 << sk->sk_state) & | |
668 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 669 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 670 | #endif |
f6d8bd05 ED |
671 | if (old) |
672 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 673 | if (opt) |
f6d8bd05 | 674 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 675 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 676 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 677 | } |
132adf54 | 678 | #endif |
1da177e4 | 679 | } |
f6d8bd05 ED |
680 | rcu_assign_pointer(inet->inet_opt, opt); |
681 | if (old) | |
605b4afe | 682 | kfree_rcu(old, rcu); |
132adf54 SH |
683 | break; |
684 | } | |
685 | case IP_PKTINFO: | |
686 | if (val) | |
687 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
688 | else | |
689 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
690 | break; | |
691 | case IP_RECVTTL: | |
692 | if (val) | |
693 | inet->cmsg_flags |= IP_CMSG_TTL; | |
694 | else | |
695 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
696 | break; | |
697 | case IP_RECVTOS: | |
698 | if (val) | |
699 | inet->cmsg_flags |= IP_CMSG_TOS; | |
700 | else | |
701 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
702 | break; | |
703 | case IP_RECVOPTS: | |
704 | if (val) | |
705 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
706 | else | |
707 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
708 | break; | |
709 | case IP_RETOPTS: | |
710 | if (val) | |
711 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
712 | else | |
713 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
714 | break; | |
715 | case IP_PASSSEC: | |
716 | if (val) | |
717 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
718 | else | |
719 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
720 | break; | |
e8b2dfe9 BS |
721 | case IP_RECVORIGDSTADDR: |
722 | if (val) | |
723 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
724 | else | |
725 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
726 | break; | |
ad6f939a TH |
727 | case IP_CHECKSUM: |
728 | if (val) { | |
729 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
730 | inet_inc_convert_csum(sk); | |
731 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
732 | } | |
733 | } else { | |
734 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
735 | inet_dec_convert_csum(sk); | |
736 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
737 | } | |
738 | } | |
739 | break; | |
70ecc248 WB |
740 | case IP_RECVFRAGSIZE: |
741 | if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) | |
742 | goto e_inval; | |
743 | if (val) | |
744 | inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; | |
745 | else | |
746 | inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; | |
747 | break; | |
132adf54 SH |
748 | case IP_TOS: /* This sets both TOS and Precedence */ |
749 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
750 | val &= ~INET_ECN_MASK; |
751 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 752 | } |
132adf54 SH |
753 | if (inet->tos != val) { |
754 | inet->tos = val; | |
755 | sk->sk_priority = rt_tos2priority(val); | |
756 | sk_dst_reset(sk); | |
757 | } | |
758 | break; | |
759 | case IP_TTL: | |
4d52cfbe | 760 | if (optlen < 1) |
132adf54 | 761 | goto e_inval; |
c9be4a5c | 762 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
763 | goto e_inval; |
764 | inet->uc_ttl = val; | |
765 | break; | |
766 | case IP_HDRINCL: | |
767 | if (sk->sk_type != SOCK_RAW) { | |
768 | err = -ENOPROTOOPT; | |
2c7946a7 | 769 | break; |
132adf54 SH |
770 | } |
771 | inet->hdrincl = val ? 1 : 0; | |
772 | break; | |
7b2ff18e JO |
773 | case IP_NODEFRAG: |
774 | if (sk->sk_type != SOCK_RAW) { | |
775 | err = -ENOPROTOOPT; | |
776 | break; | |
777 | } | |
778 | inet->nodefrag = val ? 1 : 0; | |
779 | break; | |
90c337da ED |
780 | case IP_BIND_ADDRESS_NO_PORT: |
781 | inet->bind_address_no_port = val ? 1 : 0; | |
782 | break; | |
132adf54 | 783 | case IP_MTU_DISCOVER: |
1b346576 | 784 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
785 | goto e_inval; |
786 | inet->pmtudisc = val; | |
787 | break; | |
788 | case IP_RECVERR: | |
789 | inet->recverr = !!val; | |
790 | if (!val) | |
791 | skb_queue_purge(&sk->sk_error_queue); | |
792 | break; | |
793 | case IP_MULTICAST_TTL: | |
794 | if (sk->sk_type == SOCK_STREAM) | |
795 | goto e_inval; | |
4d52cfbe | 796 | if (optlen < 1) |
132adf54 | 797 | goto e_inval; |
09cb105e | 798 | if (val == -1) |
132adf54 SH |
799 | val = 1; |
800 | if (val < 0 || val > 255) | |
801 | goto e_inval; | |
802 | inet->mc_ttl = val; | |
803 | break; | |
804 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 805 | if (optlen < 1) |
132adf54 SH |
806 | goto e_inval; |
807 | inet->mc_loop = !!val; | |
808 | break; | |
76e21053 EH |
809 | case IP_UNICAST_IF: |
810 | { | |
811 | struct net_device *dev = NULL; | |
812 | int ifindex; | |
813 | ||
814 | if (optlen != sizeof(int)) | |
815 | goto e_inval; | |
816 | ||
817 | ifindex = (__force int)ntohl((__force __be32)val); | |
818 | if (ifindex == 0) { | |
819 | inet->uc_index = 0; | |
820 | err = 0; | |
821 | break; | |
822 | } | |
823 | ||
824 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
825 | err = -EADDRNOTAVAIL; | |
826 | if (!dev) | |
827 | break; | |
828 | dev_put(dev); | |
829 | ||
830 | err = -EINVAL; | |
831 | if (sk->sk_bound_dev_if) | |
832 | break; | |
833 | ||
834 | inet->uc_index = ifindex; | |
835 | err = 0; | |
836 | break; | |
837 | } | |
132adf54 SH |
838 | case IP_MULTICAST_IF: |
839 | { | |
840 | struct ip_mreqn mreq; | |
841 | struct net_device *dev = NULL; | |
7bb387c5 | 842 | int midx; |
132adf54 SH |
843 | |
844 | if (sk->sk_type == SOCK_STREAM) | |
845 | goto e_inval; | |
846 | /* | |
847 | * Check the arguments are allowable | |
848 | */ | |
849 | ||
0915921b SW |
850 | if (optlen < sizeof(struct in_addr)) |
851 | goto e_inval; | |
852 | ||
132adf54 SH |
853 | err = -EFAULT; |
854 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 855 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 856 | break; |
132adf54 SH |
857 | } else { |
858 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
859 | if (optlen >= sizeof(struct ip_mreq)) { |
860 | if (copy_from_user(&mreq, optval, | |
861 | sizeof(struct ip_mreq))) | |
862 | break; | |
863 | } else if (optlen >= sizeof(struct in_addr)) { | |
864 | if (copy_from_user(&mreq.imr_address, optval, | |
865 | sizeof(struct in_addr))) | |
866 | break; | |
867 | } | |
132adf54 SH |
868 | } |
869 | ||
870 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 871 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
872 | inet->mc_index = 0; |
873 | inet->mc_addr = 0; | |
874 | err = 0; | |
1da177e4 LT |
875 | break; |
876 | } | |
3b1e0a65 | 877 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 878 | if (dev) |
132adf54 | 879 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 880 | } else |
55b80503 | 881 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 882 | |
1da177e4 | 883 | |
132adf54 SH |
884 | err = -EADDRNOTAVAIL; |
885 | if (!dev) | |
886 | break; | |
7bb387c5 DA |
887 | |
888 | midx = l3mdev_master_ifindex(dev); | |
889 | ||
55b80503 | 890 | dev_put(dev); |
132adf54 SH |
891 | |
892 | err = -EINVAL; | |
893 | if (sk->sk_bound_dev_if && | |
7bb387c5 DA |
894 | mreq.imr_ifindex != sk->sk_bound_dev_if && |
895 | (!midx || midx != sk->sk_bound_dev_if)) | |
132adf54 | 896 | break; |
1da177e4 | 897 | |
132adf54 SH |
898 | inet->mc_index = mreq.imr_ifindex; |
899 | inet->mc_addr = mreq.imr_address.s_addr; | |
900 | err = 0; | |
901 | break; | |
902 | } | |
1da177e4 | 903 | |
132adf54 SH |
904 | case IP_ADD_MEMBERSHIP: |
905 | case IP_DROP_MEMBERSHIP: | |
906 | { | |
907 | struct ip_mreqn mreq; | |
1da177e4 | 908 | |
a96fb49b FL |
909 | err = -EPROTO; |
910 | if (inet_sk(sk)->is_icsk) | |
911 | break; | |
912 | ||
132adf54 SH |
913 | if (optlen < sizeof(struct ip_mreq)) |
914 | goto e_inval; | |
915 | err = -EFAULT; | |
916 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 917 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 918 | break; |
132adf54 SH |
919 | } else { |
920 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 921 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 922 | break; |
132adf54 | 923 | } |
1da177e4 | 924 | |
132adf54 | 925 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 926 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 927 | else |
54ff9ef3 | 928 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
929 | break; |
930 | } | |
931 | case IP_MSFILTER: | |
932 | { | |
132adf54 SH |
933 | struct ip_msfilter *msf; |
934 | ||
935 | if (optlen < IP_MSFILTER_SIZE(0)) | |
936 | goto e_inval; | |
937 | if (optlen > sysctl_optmem_max) { | |
938 | err = -ENOBUFS; | |
1da177e4 LT |
939 | break; |
940 | } | |
a2c841d9 AV |
941 | msf = memdup_user(optval, optlen); |
942 | if (IS_ERR(msf)) { | |
943 | err = PTR_ERR(msf); | |
132adf54 SH |
944 | break; |
945 | } | |
946 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
947 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 948 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
949 | kfree(msf); |
950 | err = -ENOBUFS; | |
951 | break; | |
952 | } | |
953 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
954 | kfree(msf); | |
955 | err = -EINVAL; | |
956 | break; | |
957 | } | |
958 | err = ip_mc_msfilter(sk, msf, 0); | |
959 | kfree(msf); | |
960 | break; | |
961 | } | |
962 | case IP_BLOCK_SOURCE: | |
963 | case IP_UNBLOCK_SOURCE: | |
964 | case IP_ADD_SOURCE_MEMBERSHIP: | |
965 | case IP_DROP_SOURCE_MEMBERSHIP: | |
966 | { | |
967 | struct ip_mreq_source mreqs; | |
968 | int omode, add; | |
1da177e4 | 969 | |
132adf54 SH |
970 | if (optlen != sizeof(struct ip_mreq_source)) |
971 | goto e_inval; | |
972 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 973 | err = -EFAULT; |
1da177e4 LT |
974 | break; |
975 | } | |
132adf54 SH |
976 | if (optname == IP_BLOCK_SOURCE) { |
977 | omode = MCAST_EXCLUDE; | |
978 | add = 1; | |
979 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
980 | omode = MCAST_EXCLUDE; | |
981 | add = 0; | |
982 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
983 | struct ip_mreqn mreq; | |
1da177e4 | 984 | |
132adf54 SH |
985 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
986 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
987 | mreq.imr_ifindex = 0; | |
54ff9ef3 | 988 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 989 | if (err && err != -EADDRINUSE) |
1da177e4 | 990 | break; |
132adf54 SH |
991 | omode = MCAST_INCLUDE; |
992 | add = 1; | |
993 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
994 | omode = MCAST_INCLUDE; | |
995 | add = 0; | |
996 | } | |
997 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
998 | break; | |
999 | } | |
1000 | case MCAST_JOIN_GROUP: | |
1001 | case MCAST_LEAVE_GROUP: | |
1002 | { | |
1003 | struct group_req greq; | |
1004 | struct sockaddr_in *psin; | |
1005 | struct ip_mreqn mreq; | |
1006 | ||
1007 | if (optlen < sizeof(struct group_req)) | |
1008 | goto e_inval; | |
1009 | err = -EFAULT; | |
1010 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
1011 | break; | |
1012 | psin = (struct sockaddr_in *)&greq.gr_group; | |
1013 | if (psin->sin_family != AF_INET) | |
1014 | goto e_inval; | |
1015 | memset(&mreq, 0, sizeof(mreq)); | |
1016 | mreq.imr_multiaddr = psin->sin_addr; | |
1017 | mreq.imr_ifindex = greq.gr_interface; | |
1018 | ||
1019 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 1020 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1021 | else |
54ff9ef3 | 1022 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1023 | break; |
1024 | } | |
1025 | case MCAST_JOIN_SOURCE_GROUP: | |
1026 | case MCAST_LEAVE_SOURCE_GROUP: | |
1027 | case MCAST_BLOCK_SOURCE: | |
1028 | case MCAST_UNBLOCK_SOURCE: | |
1029 | { | |
1030 | struct group_source_req greqs; | |
1031 | struct ip_mreq_source mreqs; | |
1032 | struct sockaddr_in *psin; | |
1033 | int omode, add; | |
1034 | ||
1035 | if (optlen != sizeof(struct group_source_req)) | |
1036 | goto e_inval; | |
1037 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1038 | err = -EFAULT; |
1da177e4 LT |
1039 | break; |
1040 | } | |
132adf54 SH |
1041 | if (greqs.gsr_group.ss_family != AF_INET || |
1042 | greqs.gsr_source.ss_family != AF_INET) { | |
1043 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1044 | break; |
1045 | } | |
132adf54 SH |
1046 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1047 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1048 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1049 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1050 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1051 | ||
1052 | if (optname == MCAST_BLOCK_SOURCE) { | |
1053 | omode = MCAST_EXCLUDE; | |
1054 | add = 1; | |
1055 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1056 | omode = MCAST_EXCLUDE; | |
1057 | add = 0; | |
1058 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1059 | struct ip_mreqn mreq; |
1060 | ||
132adf54 | 1061 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1062 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1063 | mreq.imr_address.s_addr = 0; |
1064 | mreq.imr_ifindex = greqs.gsr_interface; | |
54ff9ef3 | 1065 | err = ip_mc_join_group(sk, &mreq); |
132adf54 SH |
1066 | if (err && err != -EADDRINUSE) |
1067 | break; | |
1068 | greqs.gsr_interface = mreq.imr_ifindex; | |
1069 | omode = MCAST_INCLUDE; | |
1070 | add = 1; | |
1071 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1072 | omode = MCAST_INCLUDE; | |
1073 | add = 0; | |
1074 | } | |
1075 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1076 | greqs.gsr_interface); | |
1077 | break; | |
1078 | } | |
1079 | case MCAST_MSFILTER: | |
1080 | { | |
132adf54 SH |
1081 | struct sockaddr_in *psin; |
1082 | struct ip_msfilter *msf = NULL; | |
1083 | struct group_filter *gsf = NULL; | |
1084 | int msize, i, ifindex; | |
1085 | ||
1086 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1087 | goto e_inval; | |
1088 | if (optlen > sysctl_optmem_max) { | |
1089 | err = -ENOBUFS; | |
1da177e4 LT |
1090 | break; |
1091 | } | |
a2c841d9 AV |
1092 | gsf = memdup_user(optval, optlen); |
1093 | if (IS_ERR(gsf)) { | |
1094 | err = PTR_ERR(gsf); | |
1da177e4 LT |
1095 | break; |
1096 | } | |
4d52cfbe | 1097 | |
132adf54 SH |
1098 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1099 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1100 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1101 | err = -ENOBUFS; |
1102 | goto mc_msf_out; | |
1103 | } | |
1104 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1105 | err = -EINVAL; | |
1106 | goto mc_msf_out; | |
1107 | } | |
1108 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1109 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1110 | if (!msf) { |
132adf54 SH |
1111 | err = -ENOBUFS; |
1112 | goto mc_msf_out; | |
1113 | } | |
1114 | ifindex = gsf->gf_interface; | |
1115 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1116 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1117 | err = -EADDRNOTAVAIL; |
132adf54 | 1118 | goto mc_msf_out; |
1da177e4 | 1119 | } |
132adf54 SH |
1120 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1121 | msf->imsf_interface = 0; | |
1122 | msf->imsf_fmode = gsf->gf_fmode; | |
1123 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1124 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1125 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1126 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1127 | |
132adf54 SH |
1128 | if (psin->sin_family != AF_INET) |
1129 | goto mc_msf_out; | |
1130 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1131 | } | |
1132 | kfree(gsf); | |
1133 | gsf = NULL; | |
1134 | ||
1135 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1136 | mc_msf_out: |
132adf54 SH |
1137 | kfree(msf); |
1138 | kfree(gsf); | |
1139 | break; | |
1140 | } | |
f771bef9 NS |
1141 | case IP_MULTICAST_ALL: |
1142 | if (optlen < 1) | |
1143 | goto e_inval; | |
1144 | if (val != 0 && val != 1) | |
1145 | goto e_inval; | |
1146 | inet->mc_all = val; | |
1147 | break; | |
132adf54 SH |
1148 | case IP_ROUTER_ALERT: |
1149 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1150 | break; | |
1151 | ||
1152 | case IP_FREEBIND: | |
4d52cfbe | 1153 | if (optlen < 1) |
132adf54 SH |
1154 | goto e_inval; |
1155 | inet->freebind = !!val; | |
1156 | break; | |
1157 | ||
1158 | case IP_IPSEC_POLICY: | |
1159 | case IP_XFRM_POLICY: | |
1160 | err = -EPERM; | |
52e804c6 | 1161 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1162 | break; |
132adf54 SH |
1163 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1164 | break; | |
1da177e4 | 1165 | |
f5715aea | 1166 | case IP_TRANSPARENT: |
52e804c6 EB |
1167 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1168 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1169 | err = -EPERM; |
1170 | break; | |
1171 | } | |
1172 | if (optlen < 1) | |
1173 | goto e_inval; | |
1174 | inet->transparent = !!val; | |
1175 | break; | |
1176 | ||
d218d111 SH |
1177 | case IP_MINTTL: |
1178 | if (optlen < 1) | |
1179 | goto e_inval; | |
1180 | if (val < 0 || val > 255) | |
1181 | goto e_inval; | |
1182 | inet->min_ttl = val; | |
1183 | break; | |
1184 | ||
132adf54 SH |
1185 | default: |
1186 | err = -ENOPROTOOPT; | |
1187 | break; | |
1da177e4 LT |
1188 | } |
1189 | release_sock(sk); | |
baf606d9 MRL |
1190 | if (needs_rtnl) |
1191 | rtnl_unlock(); | |
1da177e4 LT |
1192 | return err; |
1193 | ||
1194 | e_inval: | |
1195 | release_sock(sk); | |
baf606d9 MRL |
1196 | if (needs_rtnl) |
1197 | rtnl_unlock(); | |
1da177e4 LT |
1198 | return -EINVAL; |
1199 | } | |
1200 | ||
f84af32c | 1201 | /** |
829ae9d6 | 1202 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1203 | * @sk: socket |
1204 | * @skb: buffer | |
1205 | * | |
35ebf65e DM |
1206 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1207 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1208 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1209 | */ |
fbf8866d | 1210 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1211 | { |
d826eb14 | 1212 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1213 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1214 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1215 | |
4b261c75 | 1216 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1217 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1218 | * which has interface index (iif) as the first member of the | |
1219 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1220 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
f0c16ba8 WZ |
1221 | * element so the iif is picked up from the prior IPCB. If iif |
1222 | * is the loopback interface, then return the sending interface | |
1223 | * (e.g., process binds socket to eth0 for Tx which is | |
1224 | * redirected to loopback in the rtable/dst). | |
0b922b7a | 1225 | */ |
cbea8f02 DA |
1226 | struct rtable *rt = skb_rtable(skb); |
1227 | bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); | |
1228 | ||
1229 | if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) | |
f0c16ba8 | 1230 | pktinfo->ipi_ifindex = inet_iif(skb); |
cbea8f02 DA |
1231 | else if (l3slave && rt && rt->rt_iif) |
1232 | pktinfo->ipi_ifindex = rt->rt_iif; | |
f0c16ba8 | 1233 | |
35ebf65e | 1234 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1235 | } else { |
1236 | pktinfo->ipi_ifindex = 0; | |
1237 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1238 | } | |
61a1030b | 1239 | skb_dst_drop(skb); |
f84af32c | 1240 | } |
f84af32c | 1241 | |
3fdadf7d | 1242 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1243 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1244 | { |
1245 | int err; | |
1246 | ||
1247 | if (level != SOL_IP) | |
1248 | return -ENOPROTOOPT; | |
1249 | ||
1250 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1251 | #ifdef CONFIG_NETFILTER | |
1252 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1253 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1254 | optname != IP_IPSEC_POLICY && |
1255 | optname != IP_XFRM_POLICY && | |
929f21ab | 1256 | !ip_mroute_opt(optname)) |
3fdadf7d | 1257 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
3fdadf7d DM |
1258 | #endif |
1259 | return err; | |
1260 | } | |
4d52cfbe | 1261 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1262 | |
1263 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1264 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1265 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1266 | { |
1267 | int err; | |
1268 | ||
1269 | if (level != SOL_IP) | |
1270 | return -ENOPROTOOPT; | |
1271 | ||
dae50295 DS |
1272 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1273 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1274 | ip_setsockopt); | |
1275 | ||
3fdadf7d DM |
1276 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1277 | #ifdef CONFIG_NETFILTER | |
1278 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1279 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1280 | optname != IP_IPSEC_POLICY && |
1281 | optname != IP_XFRM_POLICY && | |
929f21ab PA |
1282 | !ip_mroute_opt(optname)) |
1283 | err = compat_nf_setsockopt(sk, PF_INET, optname, optval, | |
1284 | optlen); | |
3fdadf7d DM |
1285 | #endif |
1286 | return err; | |
1287 | } | |
543d9cfe | 1288 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1289 | #endif |
1290 | ||
1da177e4 | 1291 | /* |
4d52cfbe ED |
1292 | * Get the options. Note for future reference. The GET of IP options gets |
1293 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1294 | */ |
1295 | ||
87e9f031 WC |
1296 | static bool getsockopt_needs_rtnl(int optname) |
1297 | { | |
1298 | switch (optname) { | |
1299 | case IP_MSFILTER: | |
1300 | case MCAST_MSFILTER: | |
1301 | return true; | |
1302 | } | |
1303 | return false; | |
1304 | } | |
1305 | ||
3fdadf7d | 1306 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1307 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1308 | { |
1309 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1310 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1311 | int val, err = 0; | |
1da177e4 | 1312 | int len; |
e905a9ed | 1313 | |
132adf54 | 1314 | if (level != SOL_IP) |
1da177e4 LT |
1315 | return -EOPNOTSUPP; |
1316 | ||
6a9fb947 | 1317 | if (ip_mroute_opt(optname)) |
09cb105e | 1318 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1319 | |
09cb105e | 1320 | if (get_user(len, optlen)) |
1da177e4 | 1321 | return -EFAULT; |
132adf54 | 1322 | if (len < 0) |
1da177e4 | 1323 | return -EINVAL; |
e905a9ed | 1324 | |
87e9f031 WC |
1325 | if (needs_rtnl) |
1326 | rtnl_lock(); | |
1da177e4 LT |
1327 | lock_sock(sk); |
1328 | ||
132adf54 SH |
1329 | switch (optname) { |
1330 | case IP_OPTIONS: | |
1331 | { | |
1332 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1333 | struct ip_options *opt = (struct ip_options *)optbuf; |
1334 | struct ip_options_rcu *inet_opt; | |
1335 | ||
1336 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1337 | lockdep_sock_is_held(sk)); |
132adf54 | 1338 | opt->optlen = 0; |
f6d8bd05 ED |
1339 | if (inet_opt) |
1340 | memcpy(optbuf, &inet_opt->opt, | |
1341 | sizeof(struct ip_options) + | |
1342 | inet_opt->opt.optlen); | |
132adf54 SH |
1343 | release_sock(sk); |
1344 | ||
1345 | if (opt->optlen == 0) | |
1346 | return put_user(0, optlen); | |
1347 | ||
1348 | ip_options_undo(opt); | |
1349 | ||
1350 | len = min_t(unsigned int, len, opt->optlen); | |
1351 | if (put_user(len, optlen)) | |
1352 | return -EFAULT; | |
1353 | if (copy_to_user(optval, opt->__data, len)) | |
1354 | return -EFAULT; | |
1355 | return 0; | |
1356 | } | |
1357 | case IP_PKTINFO: | |
1358 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1359 | break; | |
1360 | case IP_RECVTTL: | |
1361 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1362 | break; | |
1363 | case IP_RECVTOS: | |
1364 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1365 | break; | |
1366 | case IP_RECVOPTS: | |
1367 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1368 | break; | |
1369 | case IP_RETOPTS: | |
1370 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1371 | break; | |
1372 | case IP_PASSSEC: | |
1373 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1374 | break; | |
e8b2dfe9 BS |
1375 | case IP_RECVORIGDSTADDR: |
1376 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1377 | break; | |
ad6f939a TH |
1378 | case IP_CHECKSUM: |
1379 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1380 | break; | |
70ecc248 WB |
1381 | case IP_RECVFRAGSIZE: |
1382 | val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; | |
1383 | break; | |
132adf54 SH |
1384 | case IP_TOS: |
1385 | val = inet->tos; | |
1386 | break; | |
1387 | case IP_TTL: | |
fa50d974 NB |
1388 | { |
1389 | struct net *net = sock_net(sk); | |
132adf54 | 1390 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1391 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1392 | inet->uc_ttl); |
1393 | break; | |
fa50d974 | 1394 | } |
132adf54 SH |
1395 | case IP_HDRINCL: |
1396 | val = inet->hdrincl; | |
1397 | break; | |
a89b4763 MK |
1398 | case IP_NODEFRAG: |
1399 | val = inet->nodefrag; | |
1400 | break; | |
90c337da ED |
1401 | case IP_BIND_ADDRESS_NO_PORT: |
1402 | val = inet->bind_address_no_port; | |
1403 | break; | |
132adf54 SH |
1404 | case IP_MTU_DISCOVER: |
1405 | val = inet->pmtudisc; | |
1406 | break; | |
1407 | case IP_MTU: | |
1408 | { | |
1409 | struct dst_entry *dst; | |
1410 | val = 0; | |
1411 | dst = sk_dst_get(sk); | |
1412 | if (dst) { | |
1413 | val = dst_mtu(dst); | |
1414 | dst_release(dst); | |
1da177e4 | 1415 | } |
132adf54 | 1416 | if (!val) { |
1da177e4 | 1417 | release_sock(sk); |
132adf54 | 1418 | return -ENOTCONN; |
1da177e4 | 1419 | } |
132adf54 SH |
1420 | break; |
1421 | } | |
1422 | case IP_RECVERR: | |
1423 | val = inet->recverr; | |
1424 | break; | |
1425 | case IP_MULTICAST_TTL: | |
1426 | val = inet->mc_ttl; | |
1427 | break; | |
1428 | case IP_MULTICAST_LOOP: | |
1429 | val = inet->mc_loop; | |
1430 | break; | |
76e21053 EH |
1431 | case IP_UNICAST_IF: |
1432 | val = (__force int)htonl((__u32) inet->uc_index); | |
1433 | break; | |
132adf54 SH |
1434 | case IP_MULTICAST_IF: |
1435 | { | |
1436 | struct in_addr addr; | |
1437 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1438 | addr.s_addr = inet->mc_addr; | |
1439 | release_sock(sk); | |
1da177e4 | 1440 | |
132adf54 SH |
1441 | if (put_user(len, optlen)) |
1442 | return -EFAULT; | |
1443 | if (copy_to_user(optval, &addr, len)) | |
1444 | return -EFAULT; | |
1445 | return 0; | |
1446 | } | |
1447 | case IP_MSFILTER: | |
1448 | { | |
1449 | struct ip_msfilter msf; | |
132adf54 SH |
1450 | |
1451 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1452 | err = -EINVAL; |
1453 | goto out; | |
1da177e4 | 1454 | } |
132adf54 | 1455 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1456 | err = -EFAULT; |
1457 | goto out; | |
1da177e4 | 1458 | } |
132adf54 SH |
1459 | err = ip_mc_msfget(sk, &msf, |
1460 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1461 | goto out; |
132adf54 SH |
1462 | } |
1463 | case MCAST_MSFILTER: | |
1464 | { | |
1465 | struct group_filter gsf; | |
1da177e4 | 1466 | |
132adf54 | 1467 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1468 | err = -EINVAL; |
1469 | goto out; | |
132adf54 SH |
1470 | } |
1471 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1472 | err = -EFAULT; |
1473 | goto out; | |
132adf54 SH |
1474 | } |
1475 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1476 | (struct group_filter __user *)optval, |
1477 | optlen); | |
87e9f031 | 1478 | goto out; |
132adf54 | 1479 | } |
f771bef9 NS |
1480 | case IP_MULTICAST_ALL: |
1481 | val = inet->mc_all; | |
1482 | break; | |
132adf54 SH |
1483 | case IP_PKTOPTIONS: |
1484 | { | |
1485 | struct msghdr msg; | |
1da177e4 | 1486 | |
132adf54 | 1487 | release_sock(sk); |
1da177e4 | 1488 | |
132adf54 SH |
1489 | if (sk->sk_type != SOCK_STREAM) |
1490 | return -ENOPROTOOPT; | |
1da177e4 | 1491 | |
c54a5e02 | 1492 | msg.msg_control = (__force void *) optval; |
132adf54 | 1493 | msg.msg_controllen = len; |
dd23198e | 1494 | msg.msg_flags = flags; |
1da177e4 | 1495 | |
132adf54 SH |
1496 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1497 | struct in_pktinfo info; | |
1498 | ||
c720c7e8 ED |
1499 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1500 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1501 | info.ipi_ifindex = inet->mc_index; |
1502 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1503 | } |
132adf54 SH |
1504 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1505 | int hlim = inet->mc_ttl; | |
1506 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1507 | } | |
4c507d28 JB |
1508 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1509 | int tos = inet->rcv_tos; | |
1510 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1511 | } | |
132adf54 SH |
1512 | len -= msg.msg_controllen; |
1513 | return put_user(len, optlen); | |
1514 | } | |
1515 | case IP_FREEBIND: | |
1516 | val = inet->freebind; | |
1517 | break; | |
f5715aea KK |
1518 | case IP_TRANSPARENT: |
1519 | val = inet->transparent; | |
1520 | break; | |
d218d111 SH |
1521 | case IP_MINTTL: |
1522 | val = inet->min_ttl; | |
1523 | break; | |
132adf54 SH |
1524 | default: |
1525 | release_sock(sk); | |
1526 | return -ENOPROTOOPT; | |
1da177e4 LT |
1527 | } |
1528 | release_sock(sk); | |
e905a9ed | 1529 | |
4d52cfbe | 1530 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1531 | unsigned char ucval = (unsigned char)val; |
1532 | len = 1; | |
132adf54 | 1533 | if (put_user(len, optlen)) |
1da177e4 | 1534 | return -EFAULT; |
09cb105e | 1535 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1536 | return -EFAULT; |
1537 | } else { | |
1538 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1539 | if (put_user(len, optlen)) |
1da177e4 | 1540 | return -EFAULT; |
09cb105e | 1541 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1542 | return -EFAULT; |
1543 | } | |
1544 | return 0; | |
87e9f031 WC |
1545 | |
1546 | out: | |
1547 | release_sock(sk); | |
1548 | if (needs_rtnl) | |
1549 | rtnl_unlock(); | |
1550 | return err; | |
1da177e4 LT |
1551 | } |
1552 | ||
3fdadf7d | 1553 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1554 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1555 | { |
1556 | int err; | |
1557 | ||
dd23198e | 1558 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1559 | #ifdef CONFIG_NETFILTER |
1560 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1561 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1562 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1563 | int len; |
3fdadf7d | 1564 | |
09cb105e | 1565 | if (get_user(len, optlen)) |
3fdadf7d DM |
1566 | return -EFAULT; |
1567 | ||
8e81c3c8 | 1568 | err = nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1569 | if (err >= 0) |
1570 | err = put_user(len, optlen); | |
1571 | return err; | |
1572 | } | |
1573 | #endif | |
1574 | return err; | |
1575 | } | |
4d52cfbe | 1576 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1577 | |
1578 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1579 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1580 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1581 | { |
42908c69 DS |
1582 | int err; |
1583 | ||
1584 | if (optname == MCAST_MSFILTER) | |
1585 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1586 | ip_getsockopt); | |
1587 | ||
dd23198e DB |
1588 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1589 | MSG_CMSG_COMPAT); | |
42908c69 | 1590 | |
3fdadf7d DM |
1591 | #ifdef CONFIG_NETFILTER |
1592 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1593 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1594 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1595 | int len; |
3fdadf7d | 1596 | |
543d9cfe | 1597 | if (get_user(len, optlen)) |
3fdadf7d DM |
1598 | return -EFAULT; |
1599 | ||
543d9cfe | 1600 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1601 | if (err >= 0) |
1602 | err = put_user(len, optlen); | |
1603 | return err; | |
1604 | } | |
1605 | #endif | |
1606 | return err; | |
1607 | } | |
543d9cfe | 1608 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1609 | #endif |