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Commit | Line | Data |
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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; | |
261 | ipc->oif = src_info->ipi6_ifindex; | |
262 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; | |
263 | continue; | |
264 | } | |
265 | #endif | |
24025c46 | 266 | if (cmsg->cmsg_level == SOL_SOCKET) { |
2632616b ED |
267 | err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); |
268 | if (err) | |
269 | return err; | |
24025c46 SHY |
270 | continue; |
271 | } | |
272 | ||
1da177e4 LT |
273 | if (cmsg->cmsg_level != SOL_IP) |
274 | continue; | |
275 | switch (cmsg->cmsg_type) { | |
276 | case IP_RETOPTS: | |
1ff8cebf | 277 | err = cmsg->cmsg_len - sizeof(struct cmsghdr); |
91948309 ED |
278 | |
279 | /* Our caller is responsible for freeing ipc->opt */ | |
4d52cfbe ED |
280 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
281 | err < 40 ? err : 40); | |
1da177e4 LT |
282 | if (err) |
283 | return err; | |
284 | break; | |
285 | case IP_PKTINFO: | |
286 | { | |
287 | struct in_pktinfo *info; | |
288 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
289 | return -EINVAL; | |
290 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
291 | ipc->oif = info->ipi_ifindex; | |
292 | ipc->addr = info->ipi_spec_dst.s_addr; | |
293 | break; | |
294 | } | |
f02db315 FF |
295 | case IP_TTL: |
296 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
297 | return -EINVAL; | |
298 | val = *(int *)CMSG_DATA(cmsg); | |
299 | if (val < 1 || val > 255) | |
300 | return -EINVAL; | |
301 | ipc->ttl = val; | |
302 | break; | |
303 | case IP_TOS: | |
e895cdce ED |
304 | if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) |
305 | val = *(int *)CMSG_DATA(cmsg); | |
306 | else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) | |
307 | val = *(u8 *)CMSG_DATA(cmsg); | |
308 | else | |
f02db315 | 309 | return -EINVAL; |
f02db315 FF |
310 | if (val < 0 || val > 255) |
311 | return -EINVAL; | |
312 | ipc->tos = val; | |
313 | ipc->priority = rt_tos2priority(ipc->tos); | |
314 | break; | |
315 | ||
1da177e4 LT |
316 | default: |
317 | return -EINVAL; | |
318 | } | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | ||
324 | /* Special input handler for packets caught by router alert option. | |
325 | They are selected only by protocol field, and then processed likely | |
326 | local ones; but only if someone wants them! Otherwise, router | |
327 | not running rsvpd will kill RSVP. | |
328 | ||
329 | It is user level problem, what it will make with them. | |
330 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
331 | but receiver should be enough clever f.e. to forward mtrace requests, | |
332 | sent to multicast group to reach destination designated router. | |
333 | */ | |
43a951e9 | 334 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 | 335 | |
592fcb9d ED |
336 | |
337 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 338 | { |
592fcb9d ED |
339 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
340 | ||
341 | sock_put(ra->saved_sk); | |
342 | kfree(ra); | |
66018506 | 343 | } |
1da177e4 | 344 | |
4d52cfbe ED |
345 | int ip_ra_control(struct sock *sk, unsigned char on, |
346 | void (*destructor)(struct sock *)) | |
1da177e4 | 347 | { |
43a951e9 ED |
348 | struct ip_ra_chain *ra, *new_ra; |
349 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 350 | |
c720c7e8 | 351 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
352 | return -EINVAL; |
353 | ||
354 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
355 | ||
43a951e9 | 356 | for (rap = &ip_ra_chain; |
ba3f571d | 357 | (ra = rtnl_dereference(*rap)) != NULL; |
43a951e9 | 358 | rap = &ra->next) { |
1da177e4 LT |
359 | if (ra->sk == sk) { |
360 | if (on) { | |
a51482bd | 361 | kfree(new_ra); |
1da177e4 LT |
362 | return -EADDRINUSE; |
363 | } | |
592fcb9d ED |
364 | /* dont let ip_call_ra_chain() use sk again */ |
365 | ra->sk = NULL; | |
8e380f00 | 366 | RCU_INIT_POINTER(*rap, ra->next); |
1da177e4 LT |
367 | |
368 | if (ra->destructor) | |
369 | ra->destructor(sk); | |
592fcb9d ED |
370 | /* |
371 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
372 | * period. This guarantee ip_call_ra_chain() dont need | |
373 | * to mess with socket refcounts. | |
374 | */ | |
375 | ra->saved_sk = sk; | |
376 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
377 | return 0; |
378 | } | |
379 | } | |
ba3f571d | 380 | if (!new_ra) |
1da177e4 | 381 | return -ENOBUFS; |
1da177e4 LT |
382 | new_ra->sk = sk; |
383 | new_ra->destructor = destructor; | |
384 | ||
8e380f00 | 385 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 386 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 387 | sock_hold(sk); |
1da177e4 LT |
388 | |
389 | return 0; | |
390 | } | |
391 | ||
e905a9ed | 392 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 393 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 394 | { |
1da177e4 LT |
395 | struct sock_exterr_skb *serr; |
396 | ||
1da177e4 LT |
397 | skb = skb_clone(skb, GFP_ATOMIC); |
398 | if (!skb) | |
399 | return; | |
400 | ||
e905a9ed | 401 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
402 | serr->ee.ee_errno = err; |
403 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
404 | serr->ee.ee_type = icmp_hdr(skb)->type; |
405 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
406 | serr->ee.ee_pad = 0; |
407 | serr->ee.ee_info = info; | |
408 | serr->ee.ee_data = 0; | |
88c7664f | 409 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 410 | skb_network_header(skb); |
1da177e4 LT |
411 | serr->port = port; |
412 | ||
00db4124 | 413 | if (skb_pull(skb, payload - skb->data)) { |
bd82393c ACM |
414 | skb_reset_transport_header(skb); |
415 | if (sock_queue_err_skb(sk, skb) == 0) | |
416 | return; | |
417 | } | |
418 | kfree_skb(skb); | |
1da177e4 LT |
419 | } |
420 | ||
0579016e | 421 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
422 | { |
423 | struct inet_sock *inet = inet_sk(sk); | |
424 | struct sock_exterr_skb *serr; | |
425 | struct iphdr *iph; | |
426 | struct sk_buff *skb; | |
427 | ||
428 | if (!inet->recverr) | |
429 | return; | |
430 | ||
431 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
432 | if (!skb) | |
433 | return; | |
434 | ||
2ca9e6f2 ACM |
435 | skb_put(skb, sizeof(struct iphdr)); |
436 | skb_reset_network_header(skb); | |
eddc9ec5 | 437 | iph = ip_hdr(skb); |
1da177e4 LT |
438 | iph->daddr = daddr; |
439 | ||
e905a9ed | 440 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
441 | serr->ee.ee_errno = err; |
442 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 443 | serr->ee.ee_type = 0; |
1da177e4 LT |
444 | serr->ee.ee_code = 0; |
445 | serr->ee.ee_pad = 0; | |
446 | serr->ee.ee_info = info; | |
447 | serr->ee.ee_data = 0; | |
d56f90a7 | 448 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
449 | serr->port = port; |
450 | ||
27a884dc | 451 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 452 | skb_reset_transport_header(skb); |
1da177e4 LT |
453 | |
454 | if (sock_queue_err_skb(sk, skb)) | |
455 | kfree_skb(skb); | |
456 | } | |
457 | ||
34b99df4 JA |
458 | /* For some errors we have valid addr_offset even with zero payload and |
459 | * zero port. Also, addr_offset should be supported if port is set. | |
460 | */ | |
461 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
462 | { | |
463 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
464 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
465 | } | |
466 | ||
c247f053 WB |
467 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
468 | * | |
469 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
470 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
471 | */ | |
472 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
473 | struct sk_buff *skb, | |
474 | int ee_origin) | |
829ae9d6 | 475 | { |
c247f053 WB |
476 | struct in_pktinfo *info; |
477 | ||
478 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
479 | return true; | |
829ae9d6 | 480 | |
c247f053 WB |
481 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
482 | return false; | |
483 | ||
484 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
1862d620 | 485 | * timestamp with egress dev. Not possible for packets without iif |
c247f053 WB |
486 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). |
487 | */ | |
1862d620 WB |
488 | info = PKTINFO_SKB_CB(skb); |
489 | if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || | |
490 | !info->ipi_ifindex) | |
829ae9d6 WB |
491 | return false; |
492 | ||
493 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
829ae9d6 WB |
494 | return true; |
495 | } | |
496 | ||
e905a9ed | 497 | /* |
1da177e4 LT |
498 | * Handle MSG_ERRQUEUE |
499 | */ | |
85fbaa75 | 500 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
501 | { |
502 | struct sock_exterr_skb *serr; | |
364a9e93 | 503 | struct sk_buff *skb; |
342dfc30 | 504 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
505 | struct { |
506 | struct sock_extended_err ee; | |
507 | struct sockaddr_in offender; | |
508 | } errhdr; | |
509 | int err; | |
510 | int copied; | |
511 | ||
7ce875e5 WB |
512 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
513 | ||
1da177e4 | 514 | err = -EAGAIN; |
364a9e93 | 515 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 516 | if (!skb) |
1da177e4 LT |
517 | goto out; |
518 | ||
519 | copied = skb->len; | |
520 | if (copied > len) { | |
521 | msg->msg_flags |= MSG_TRUNC; | |
522 | copied = len; | |
523 | } | |
51f3d02b | 524 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
525 | if (unlikely(err)) { |
526 | kfree_skb(skb); | |
527 | return err; | |
528 | } | |
1da177e4 LT |
529 | sock_recv_timestamp(msg, sk, skb); |
530 | ||
531 | serr = SKB_EXT_ERR(skb); | |
532 | ||
34b99df4 | 533 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 534 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
535 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
536 | serr->addr_offset); | |
1da177e4 LT |
537 | sin->sin_port = serr->port; |
538 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 539 | *addr_len = sizeof(*sin); |
1da177e4 LT |
540 | } |
541 | ||
542 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
543 | sin = &errhdr.offender; | |
f812116b | 544 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 545 | |
c247f053 | 546 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 547 | sin->sin_family = AF_INET; |
eddc9ec5 | 548 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 549 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
550 | ip_cmsg_recv(msg, skb); |
551 | } | |
552 | ||
553 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
554 | ||
555 | /* Now we could try to dump offended packet options */ | |
556 | ||
557 | msg->msg_flags |= MSG_ERRQUEUE; | |
558 | err = copied; | |
559 | ||
960a2628 | 560 | consume_skb(skb); |
1da177e4 LT |
561 | out: |
562 | return err; | |
563 | } | |
564 | ||
565 | ||
566 | /* | |
4d52cfbe ED |
567 | * Socket option code for IP. This is the end of the line after any |
568 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 569 | */ |
baf606d9 MRL |
570 | static bool setsockopt_needs_rtnl(int optname) |
571 | { | |
572 | switch (optname) { | |
573 | case IP_ADD_MEMBERSHIP: | |
574 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 575 | case IP_BLOCK_SOURCE: |
baf606d9 | 576 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
577 | case IP_DROP_SOURCE_MEMBERSHIP: |
578 | case IP_MSFILTER: | |
579 | case IP_UNBLOCK_SOURCE: | |
580 | case MCAST_BLOCK_SOURCE: | |
581 | case MCAST_MSFILTER: | |
baf606d9 | 582 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 583 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 584 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
585 | case MCAST_LEAVE_SOURCE_GROUP: |
586 | case MCAST_UNBLOCK_SOURCE: | |
1215e51e | 587 | case IP_ROUTER_ALERT: |
baf606d9 MRL |
588 | return true; |
589 | } | |
590 | return false; | |
591 | } | |
1da177e4 | 592 | |
3fdadf7d | 593 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 594 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
595 | { |
596 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 597 | struct net *net = sock_net(sk); |
09cb105e | 598 | int val = 0, err; |
baf606d9 | 599 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 600 | |
0c9f79be XW |
601 | switch (optname) { |
602 | case IP_PKTINFO: | |
603 | case IP_RECVTTL: | |
604 | case IP_RECVOPTS: | |
605 | case IP_RECVTOS: | |
606 | case IP_RETOPTS: | |
607 | case IP_TOS: | |
608 | case IP_TTL: | |
609 | case IP_HDRINCL: | |
610 | case IP_MTU_DISCOVER: | |
611 | case IP_RECVERR: | |
612 | case IP_ROUTER_ALERT: | |
613 | case IP_FREEBIND: | |
614 | case IP_PASSSEC: | |
615 | case IP_TRANSPARENT: | |
616 | case IP_MINTTL: | |
617 | case IP_NODEFRAG: | |
90c337da | 618 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
619 | case IP_UNICAST_IF: |
620 | case IP_MULTICAST_TTL: | |
621 | case IP_MULTICAST_ALL: | |
622 | case IP_MULTICAST_LOOP: | |
623 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 624 | case IP_CHECKSUM: |
70ecc248 | 625 | case IP_RECVFRAGSIZE: |
1da177e4 LT |
626 | if (optlen >= sizeof(int)) { |
627 | if (get_user(val, (int __user *) optval)) | |
628 | return -EFAULT; | |
629 | } else if (optlen >= sizeof(char)) { | |
630 | unsigned char ucval; | |
631 | ||
632 | if (get_user(ucval, (unsigned char __user *) optval)) | |
633 | return -EFAULT; | |
634 | val = (int) ucval; | |
635 | } | |
636 | } | |
637 | ||
638 | /* If optlen==0, it is equivalent to val == 0 */ | |
639 | ||
6a9fb947 | 640 | if (ip_mroute_opt(optname)) |
09cb105e | 641 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
642 | |
643 | err = 0; | |
baf606d9 MRL |
644 | if (needs_rtnl) |
645 | rtnl_lock(); | |
1da177e4 LT |
646 | lock_sock(sk); |
647 | ||
648 | switch (optname) { | |
132adf54 SH |
649 | case IP_OPTIONS: |
650 | { | |
f6d8bd05 ED |
651 | struct ip_options_rcu *old, *opt = NULL; |
652 | ||
65a1c4ff | 653 | if (optlen > 40) |
132adf54 | 654 | goto e_inval; |
3b1e0a65 | 655 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 656 | optval, optlen); |
132adf54 SH |
657 | if (err) |
658 | break; | |
f6d8bd05 | 659 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 660 | lockdep_sock_is_held(sk)); |
132adf54 SH |
661 | if (inet->is_icsk) { |
662 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 663 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
664 | if (sk->sk_family == PF_INET || |
665 | (!((1 << sk->sk_state) & | |
666 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 667 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 668 | #endif |
f6d8bd05 ED |
669 | if (old) |
670 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 671 | if (opt) |
f6d8bd05 | 672 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 673 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 674 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 675 | } |
132adf54 | 676 | #endif |
1da177e4 | 677 | } |
f6d8bd05 ED |
678 | rcu_assign_pointer(inet->inet_opt, opt); |
679 | if (old) | |
605b4afe | 680 | kfree_rcu(old, rcu); |
132adf54 SH |
681 | break; |
682 | } | |
683 | case IP_PKTINFO: | |
684 | if (val) | |
685 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
686 | else | |
687 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
688 | break; | |
689 | case IP_RECVTTL: | |
690 | if (val) | |
691 | inet->cmsg_flags |= IP_CMSG_TTL; | |
692 | else | |
693 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
694 | break; | |
695 | case IP_RECVTOS: | |
696 | if (val) | |
697 | inet->cmsg_flags |= IP_CMSG_TOS; | |
698 | else | |
699 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
700 | break; | |
701 | case IP_RECVOPTS: | |
702 | if (val) | |
703 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
704 | else | |
705 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
706 | break; | |
707 | case IP_RETOPTS: | |
708 | if (val) | |
709 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
710 | else | |
711 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
712 | break; | |
713 | case IP_PASSSEC: | |
714 | if (val) | |
715 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
716 | else | |
717 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
718 | break; | |
e8b2dfe9 BS |
719 | case IP_RECVORIGDSTADDR: |
720 | if (val) | |
721 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
722 | else | |
723 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
724 | break; | |
ad6f939a TH |
725 | case IP_CHECKSUM: |
726 | if (val) { | |
727 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
728 | inet_inc_convert_csum(sk); | |
729 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
730 | } | |
731 | } else { | |
732 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
733 | inet_dec_convert_csum(sk); | |
734 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
735 | } | |
736 | } | |
737 | break; | |
70ecc248 WB |
738 | case IP_RECVFRAGSIZE: |
739 | if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) | |
740 | goto e_inval; | |
741 | if (val) | |
742 | inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; | |
743 | else | |
744 | inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; | |
745 | break; | |
132adf54 SH |
746 | case IP_TOS: /* This sets both TOS and Precedence */ |
747 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
748 | val &= ~INET_ECN_MASK; |
749 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 750 | } |
132adf54 SH |
751 | if (inet->tos != val) { |
752 | inet->tos = val; | |
753 | sk->sk_priority = rt_tos2priority(val); | |
754 | sk_dst_reset(sk); | |
755 | } | |
756 | break; | |
757 | case IP_TTL: | |
4d52cfbe | 758 | if (optlen < 1) |
132adf54 | 759 | goto e_inval; |
c9be4a5c | 760 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
761 | goto e_inval; |
762 | inet->uc_ttl = val; | |
763 | break; | |
764 | case IP_HDRINCL: | |
765 | if (sk->sk_type != SOCK_RAW) { | |
766 | err = -ENOPROTOOPT; | |
2c7946a7 | 767 | break; |
132adf54 SH |
768 | } |
769 | inet->hdrincl = val ? 1 : 0; | |
770 | break; | |
7b2ff18e JO |
771 | case IP_NODEFRAG: |
772 | if (sk->sk_type != SOCK_RAW) { | |
773 | err = -ENOPROTOOPT; | |
774 | break; | |
775 | } | |
776 | inet->nodefrag = val ? 1 : 0; | |
777 | break; | |
90c337da ED |
778 | case IP_BIND_ADDRESS_NO_PORT: |
779 | inet->bind_address_no_port = val ? 1 : 0; | |
780 | break; | |
132adf54 | 781 | case IP_MTU_DISCOVER: |
1b346576 | 782 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
783 | goto e_inval; |
784 | inet->pmtudisc = val; | |
785 | break; | |
786 | case IP_RECVERR: | |
787 | inet->recverr = !!val; | |
788 | if (!val) | |
789 | skb_queue_purge(&sk->sk_error_queue); | |
790 | break; | |
791 | case IP_MULTICAST_TTL: | |
792 | if (sk->sk_type == SOCK_STREAM) | |
793 | goto e_inval; | |
4d52cfbe | 794 | if (optlen < 1) |
132adf54 | 795 | goto e_inval; |
09cb105e | 796 | if (val == -1) |
132adf54 SH |
797 | val = 1; |
798 | if (val < 0 || val > 255) | |
799 | goto e_inval; | |
800 | inet->mc_ttl = val; | |
801 | break; | |
802 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 803 | if (optlen < 1) |
132adf54 SH |
804 | goto e_inval; |
805 | inet->mc_loop = !!val; | |
806 | break; | |
76e21053 EH |
807 | case IP_UNICAST_IF: |
808 | { | |
809 | struct net_device *dev = NULL; | |
810 | int ifindex; | |
811 | ||
812 | if (optlen != sizeof(int)) | |
813 | goto e_inval; | |
814 | ||
815 | ifindex = (__force int)ntohl((__force __be32)val); | |
816 | if (ifindex == 0) { | |
817 | inet->uc_index = 0; | |
818 | err = 0; | |
819 | break; | |
820 | } | |
821 | ||
822 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
823 | err = -EADDRNOTAVAIL; | |
824 | if (!dev) | |
825 | break; | |
826 | dev_put(dev); | |
827 | ||
828 | err = -EINVAL; | |
829 | if (sk->sk_bound_dev_if) | |
830 | break; | |
831 | ||
832 | inet->uc_index = ifindex; | |
833 | err = 0; | |
834 | break; | |
835 | } | |
132adf54 SH |
836 | case IP_MULTICAST_IF: |
837 | { | |
838 | struct ip_mreqn mreq; | |
839 | struct net_device *dev = NULL; | |
7bb387c5 | 840 | int midx; |
132adf54 SH |
841 | |
842 | if (sk->sk_type == SOCK_STREAM) | |
843 | goto e_inval; | |
844 | /* | |
845 | * Check the arguments are allowable | |
846 | */ | |
847 | ||
0915921b SW |
848 | if (optlen < sizeof(struct in_addr)) |
849 | goto e_inval; | |
850 | ||
132adf54 SH |
851 | err = -EFAULT; |
852 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 853 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 854 | break; |
132adf54 SH |
855 | } else { |
856 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
857 | if (optlen >= sizeof(struct ip_mreq)) { |
858 | if (copy_from_user(&mreq, optval, | |
859 | sizeof(struct ip_mreq))) | |
860 | break; | |
861 | } else if (optlen >= sizeof(struct in_addr)) { | |
862 | if (copy_from_user(&mreq.imr_address, optval, | |
863 | sizeof(struct in_addr))) | |
864 | break; | |
865 | } | |
132adf54 SH |
866 | } |
867 | ||
868 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 869 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
870 | inet->mc_index = 0; |
871 | inet->mc_addr = 0; | |
872 | err = 0; | |
1da177e4 LT |
873 | break; |
874 | } | |
3b1e0a65 | 875 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 876 | if (dev) |
132adf54 | 877 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 878 | } else |
55b80503 | 879 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 880 | |
1da177e4 | 881 | |
132adf54 SH |
882 | err = -EADDRNOTAVAIL; |
883 | if (!dev) | |
884 | break; | |
7bb387c5 DA |
885 | |
886 | midx = l3mdev_master_ifindex(dev); | |
887 | ||
55b80503 | 888 | dev_put(dev); |
132adf54 SH |
889 | |
890 | err = -EINVAL; | |
891 | if (sk->sk_bound_dev_if && | |
7bb387c5 DA |
892 | mreq.imr_ifindex != sk->sk_bound_dev_if && |
893 | (!midx || midx != sk->sk_bound_dev_if)) | |
132adf54 | 894 | break; |
1da177e4 | 895 | |
132adf54 SH |
896 | inet->mc_index = mreq.imr_ifindex; |
897 | inet->mc_addr = mreq.imr_address.s_addr; | |
898 | err = 0; | |
899 | break; | |
900 | } | |
1da177e4 | 901 | |
132adf54 SH |
902 | case IP_ADD_MEMBERSHIP: |
903 | case IP_DROP_MEMBERSHIP: | |
904 | { | |
905 | struct ip_mreqn mreq; | |
1da177e4 | 906 | |
a96fb49b FL |
907 | err = -EPROTO; |
908 | if (inet_sk(sk)->is_icsk) | |
909 | break; | |
910 | ||
132adf54 SH |
911 | if (optlen < sizeof(struct ip_mreq)) |
912 | goto e_inval; | |
913 | err = -EFAULT; | |
914 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 915 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 916 | break; |
132adf54 SH |
917 | } else { |
918 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 919 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 920 | break; |
132adf54 | 921 | } |
1da177e4 | 922 | |
132adf54 | 923 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 924 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 925 | else |
54ff9ef3 | 926 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
927 | break; |
928 | } | |
929 | case IP_MSFILTER: | |
930 | { | |
132adf54 SH |
931 | struct ip_msfilter *msf; |
932 | ||
933 | if (optlen < IP_MSFILTER_SIZE(0)) | |
934 | goto e_inval; | |
935 | if (optlen > sysctl_optmem_max) { | |
936 | err = -ENOBUFS; | |
1da177e4 LT |
937 | break; |
938 | } | |
a2c841d9 AV |
939 | msf = memdup_user(optval, optlen); |
940 | if (IS_ERR(msf)) { | |
941 | err = PTR_ERR(msf); | |
132adf54 SH |
942 | break; |
943 | } | |
944 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
945 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 946 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
947 | kfree(msf); |
948 | err = -ENOBUFS; | |
949 | break; | |
950 | } | |
951 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
952 | kfree(msf); | |
953 | err = -EINVAL; | |
954 | break; | |
955 | } | |
956 | err = ip_mc_msfilter(sk, msf, 0); | |
957 | kfree(msf); | |
958 | break; | |
959 | } | |
960 | case IP_BLOCK_SOURCE: | |
961 | case IP_UNBLOCK_SOURCE: | |
962 | case IP_ADD_SOURCE_MEMBERSHIP: | |
963 | case IP_DROP_SOURCE_MEMBERSHIP: | |
964 | { | |
965 | struct ip_mreq_source mreqs; | |
966 | int omode, add; | |
1da177e4 | 967 | |
132adf54 SH |
968 | if (optlen != sizeof(struct ip_mreq_source)) |
969 | goto e_inval; | |
970 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 971 | err = -EFAULT; |
1da177e4 LT |
972 | break; |
973 | } | |
132adf54 SH |
974 | if (optname == IP_BLOCK_SOURCE) { |
975 | omode = MCAST_EXCLUDE; | |
976 | add = 1; | |
977 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
978 | omode = MCAST_EXCLUDE; | |
979 | add = 0; | |
980 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
981 | struct ip_mreqn mreq; | |
1da177e4 | 982 | |
132adf54 SH |
983 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
984 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
985 | mreq.imr_ifindex = 0; | |
54ff9ef3 | 986 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 987 | if (err && err != -EADDRINUSE) |
1da177e4 | 988 | break; |
132adf54 SH |
989 | omode = MCAST_INCLUDE; |
990 | add = 1; | |
991 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
992 | omode = MCAST_INCLUDE; | |
993 | add = 0; | |
994 | } | |
995 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
996 | break; | |
997 | } | |
998 | case MCAST_JOIN_GROUP: | |
999 | case MCAST_LEAVE_GROUP: | |
1000 | { | |
1001 | struct group_req greq; | |
1002 | struct sockaddr_in *psin; | |
1003 | struct ip_mreqn mreq; | |
1004 | ||
1005 | if (optlen < sizeof(struct group_req)) | |
1006 | goto e_inval; | |
1007 | err = -EFAULT; | |
1008 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
1009 | break; | |
1010 | psin = (struct sockaddr_in *)&greq.gr_group; | |
1011 | if (psin->sin_family != AF_INET) | |
1012 | goto e_inval; | |
1013 | memset(&mreq, 0, sizeof(mreq)); | |
1014 | mreq.imr_multiaddr = psin->sin_addr; | |
1015 | mreq.imr_ifindex = greq.gr_interface; | |
1016 | ||
1017 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 1018 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1019 | else |
54ff9ef3 | 1020 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1021 | break; |
1022 | } | |
1023 | case MCAST_JOIN_SOURCE_GROUP: | |
1024 | case MCAST_LEAVE_SOURCE_GROUP: | |
1025 | case MCAST_BLOCK_SOURCE: | |
1026 | case MCAST_UNBLOCK_SOURCE: | |
1027 | { | |
1028 | struct group_source_req greqs; | |
1029 | struct ip_mreq_source mreqs; | |
1030 | struct sockaddr_in *psin; | |
1031 | int omode, add; | |
1032 | ||
1033 | if (optlen != sizeof(struct group_source_req)) | |
1034 | goto e_inval; | |
1035 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1036 | err = -EFAULT; |
1da177e4 LT |
1037 | break; |
1038 | } | |
132adf54 SH |
1039 | if (greqs.gsr_group.ss_family != AF_INET || |
1040 | greqs.gsr_source.ss_family != AF_INET) { | |
1041 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1042 | break; |
1043 | } | |
132adf54 SH |
1044 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1045 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1046 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1047 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1048 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1049 | ||
1050 | if (optname == MCAST_BLOCK_SOURCE) { | |
1051 | omode = MCAST_EXCLUDE; | |
1052 | add = 1; | |
1053 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1054 | omode = MCAST_EXCLUDE; | |
1055 | add = 0; | |
1056 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1057 | struct ip_mreqn mreq; |
1058 | ||
132adf54 | 1059 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1060 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1061 | mreq.imr_address.s_addr = 0; |
1062 | mreq.imr_ifindex = greqs.gsr_interface; | |
54ff9ef3 | 1063 | err = ip_mc_join_group(sk, &mreq); |
132adf54 SH |
1064 | if (err && err != -EADDRINUSE) |
1065 | break; | |
1066 | greqs.gsr_interface = mreq.imr_ifindex; | |
1067 | omode = MCAST_INCLUDE; | |
1068 | add = 1; | |
1069 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1070 | omode = MCAST_INCLUDE; | |
1071 | add = 0; | |
1072 | } | |
1073 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1074 | greqs.gsr_interface); | |
1075 | break; | |
1076 | } | |
1077 | case MCAST_MSFILTER: | |
1078 | { | |
132adf54 SH |
1079 | struct sockaddr_in *psin; |
1080 | struct ip_msfilter *msf = NULL; | |
1081 | struct group_filter *gsf = NULL; | |
1082 | int msize, i, ifindex; | |
1083 | ||
1084 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1085 | goto e_inval; | |
1086 | if (optlen > sysctl_optmem_max) { | |
1087 | err = -ENOBUFS; | |
1da177e4 LT |
1088 | break; |
1089 | } | |
a2c841d9 AV |
1090 | gsf = memdup_user(optval, optlen); |
1091 | if (IS_ERR(gsf)) { | |
1092 | err = PTR_ERR(gsf); | |
1da177e4 LT |
1093 | break; |
1094 | } | |
4d52cfbe | 1095 | |
132adf54 SH |
1096 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1097 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1098 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1099 | err = -ENOBUFS; |
1100 | goto mc_msf_out; | |
1101 | } | |
1102 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1103 | err = -EINVAL; | |
1104 | goto mc_msf_out; | |
1105 | } | |
1106 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1107 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1108 | if (!msf) { |
132adf54 SH |
1109 | err = -ENOBUFS; |
1110 | goto mc_msf_out; | |
1111 | } | |
1112 | ifindex = gsf->gf_interface; | |
1113 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1114 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1115 | err = -EADDRNOTAVAIL; |
132adf54 | 1116 | goto mc_msf_out; |
1da177e4 | 1117 | } |
132adf54 SH |
1118 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1119 | msf->imsf_interface = 0; | |
1120 | msf->imsf_fmode = gsf->gf_fmode; | |
1121 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1122 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1123 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1124 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1125 | |
132adf54 SH |
1126 | if (psin->sin_family != AF_INET) |
1127 | goto mc_msf_out; | |
1128 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1129 | } | |
1130 | kfree(gsf); | |
1131 | gsf = NULL; | |
1132 | ||
1133 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1134 | mc_msf_out: |
132adf54 SH |
1135 | kfree(msf); |
1136 | kfree(gsf); | |
1137 | break; | |
1138 | } | |
f771bef9 NS |
1139 | case IP_MULTICAST_ALL: |
1140 | if (optlen < 1) | |
1141 | goto e_inval; | |
1142 | if (val != 0 && val != 1) | |
1143 | goto e_inval; | |
1144 | inet->mc_all = val; | |
1145 | break; | |
132adf54 SH |
1146 | case IP_ROUTER_ALERT: |
1147 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1148 | break; | |
1149 | ||
1150 | case IP_FREEBIND: | |
4d52cfbe | 1151 | if (optlen < 1) |
132adf54 SH |
1152 | goto e_inval; |
1153 | inet->freebind = !!val; | |
1154 | break; | |
1155 | ||
1156 | case IP_IPSEC_POLICY: | |
1157 | case IP_XFRM_POLICY: | |
1158 | err = -EPERM; | |
52e804c6 | 1159 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1160 | break; |
132adf54 SH |
1161 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1162 | break; | |
1da177e4 | 1163 | |
f5715aea | 1164 | case IP_TRANSPARENT: |
52e804c6 EB |
1165 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1166 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1167 | err = -EPERM; |
1168 | break; | |
1169 | } | |
1170 | if (optlen < 1) | |
1171 | goto e_inval; | |
1172 | inet->transparent = !!val; | |
1173 | break; | |
1174 | ||
d218d111 SH |
1175 | case IP_MINTTL: |
1176 | if (optlen < 1) | |
1177 | goto e_inval; | |
1178 | if (val < 0 || val > 255) | |
1179 | goto e_inval; | |
1180 | inet->min_ttl = val; | |
1181 | break; | |
1182 | ||
132adf54 SH |
1183 | default: |
1184 | err = -ENOPROTOOPT; | |
1185 | break; | |
1da177e4 LT |
1186 | } |
1187 | release_sock(sk); | |
baf606d9 MRL |
1188 | if (needs_rtnl) |
1189 | rtnl_unlock(); | |
1da177e4 LT |
1190 | return err; |
1191 | ||
1192 | e_inval: | |
1193 | release_sock(sk); | |
baf606d9 MRL |
1194 | if (needs_rtnl) |
1195 | rtnl_unlock(); | |
1da177e4 LT |
1196 | return -EINVAL; |
1197 | } | |
1198 | ||
f84af32c | 1199 | /** |
829ae9d6 | 1200 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1201 | * @sk: socket |
1202 | * @skb: buffer | |
1203 | * | |
35ebf65e DM |
1204 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1205 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1206 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1207 | */ |
fbf8866d | 1208 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1209 | { |
d826eb14 | 1210 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1211 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1212 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1213 | |
4b261c75 | 1214 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1215 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1216 | * which has interface index (iif) as the first member of the | |
1217 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1218 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
f0c16ba8 WZ |
1219 | * element so the iif is picked up from the prior IPCB. If iif |
1220 | * is the loopback interface, then return the sending interface | |
1221 | * (e.g., process binds socket to eth0 for Tx which is | |
1222 | * redirected to loopback in the rtable/dst). | |
0b922b7a | 1223 | */ |
cbea8f02 DA |
1224 | struct rtable *rt = skb_rtable(skb); |
1225 | bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); | |
1226 | ||
1227 | if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) | |
f0c16ba8 | 1228 | pktinfo->ipi_ifindex = inet_iif(skb); |
cbea8f02 DA |
1229 | else if (l3slave && rt && rt->rt_iif) |
1230 | pktinfo->ipi_ifindex = rt->rt_iif; | |
f0c16ba8 | 1231 | |
35ebf65e | 1232 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1233 | } else { |
1234 | pktinfo->ipi_ifindex = 0; | |
1235 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1236 | } | |
61a1030b | 1237 | skb_dst_drop(skb); |
f84af32c | 1238 | } |
f84af32c | 1239 | |
3fdadf7d | 1240 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1241 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1242 | { |
1243 | int err; | |
1244 | ||
1245 | if (level != SOL_IP) | |
1246 | return -ENOPROTOOPT; | |
1247 | ||
1248 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1249 | #ifdef CONFIG_NETFILTER | |
1250 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1251 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1252 | optname != IP_IPSEC_POLICY && |
1253 | optname != IP_XFRM_POLICY && | |
1254 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1255 | lock_sock(sk); |
1256 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1257 | release_sock(sk); | |
1258 | } | |
1259 | #endif | |
1260 | return err; | |
1261 | } | |
4d52cfbe | 1262 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1263 | |
1264 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1265 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1266 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1267 | { |
1268 | int err; | |
1269 | ||
1270 | if (level != SOL_IP) | |
1271 | return -ENOPROTOOPT; | |
1272 | ||
dae50295 DS |
1273 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1274 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1275 | ip_setsockopt); | |
1276 | ||
3fdadf7d DM |
1277 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1278 | #ifdef CONFIG_NETFILTER | |
1279 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1280 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1281 | optname != IP_IPSEC_POLICY && |
1282 | optname != IP_XFRM_POLICY && | |
1283 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1284 | lock_sock(sk); |
543d9cfe ACM |
1285 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1286 | optval, optlen); | |
3fdadf7d DM |
1287 | release_sock(sk); |
1288 | } | |
1289 | #endif | |
1290 | return err; | |
1291 | } | |
543d9cfe | 1292 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1293 | #endif |
1294 | ||
1da177e4 | 1295 | /* |
4d52cfbe ED |
1296 | * Get the options. Note for future reference. The GET of IP options gets |
1297 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1298 | */ |
1299 | ||
87e9f031 WC |
1300 | static bool getsockopt_needs_rtnl(int optname) |
1301 | { | |
1302 | switch (optname) { | |
1303 | case IP_MSFILTER: | |
1304 | case MCAST_MSFILTER: | |
1305 | return true; | |
1306 | } | |
1307 | return false; | |
1308 | } | |
1309 | ||
3fdadf7d | 1310 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1311 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1312 | { |
1313 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1314 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1315 | int val, err = 0; | |
1da177e4 | 1316 | int len; |
e905a9ed | 1317 | |
132adf54 | 1318 | if (level != SOL_IP) |
1da177e4 LT |
1319 | return -EOPNOTSUPP; |
1320 | ||
6a9fb947 | 1321 | if (ip_mroute_opt(optname)) |
09cb105e | 1322 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1323 | |
09cb105e | 1324 | if (get_user(len, optlen)) |
1da177e4 | 1325 | return -EFAULT; |
132adf54 | 1326 | if (len < 0) |
1da177e4 | 1327 | return -EINVAL; |
e905a9ed | 1328 | |
87e9f031 WC |
1329 | if (needs_rtnl) |
1330 | rtnl_lock(); | |
1da177e4 LT |
1331 | lock_sock(sk); |
1332 | ||
132adf54 SH |
1333 | switch (optname) { |
1334 | case IP_OPTIONS: | |
1335 | { | |
1336 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1337 | struct ip_options *opt = (struct ip_options *)optbuf; |
1338 | struct ip_options_rcu *inet_opt; | |
1339 | ||
1340 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1341 | lockdep_sock_is_held(sk)); |
132adf54 | 1342 | opt->optlen = 0; |
f6d8bd05 ED |
1343 | if (inet_opt) |
1344 | memcpy(optbuf, &inet_opt->opt, | |
1345 | sizeof(struct ip_options) + | |
1346 | inet_opt->opt.optlen); | |
132adf54 SH |
1347 | release_sock(sk); |
1348 | ||
1349 | if (opt->optlen == 0) | |
1350 | return put_user(0, optlen); | |
1351 | ||
1352 | ip_options_undo(opt); | |
1353 | ||
1354 | len = min_t(unsigned int, len, opt->optlen); | |
1355 | if (put_user(len, optlen)) | |
1356 | return -EFAULT; | |
1357 | if (copy_to_user(optval, opt->__data, len)) | |
1358 | return -EFAULT; | |
1359 | return 0; | |
1360 | } | |
1361 | case IP_PKTINFO: | |
1362 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1363 | break; | |
1364 | case IP_RECVTTL: | |
1365 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1366 | break; | |
1367 | case IP_RECVTOS: | |
1368 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1369 | break; | |
1370 | case IP_RECVOPTS: | |
1371 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1372 | break; | |
1373 | case IP_RETOPTS: | |
1374 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1375 | break; | |
1376 | case IP_PASSSEC: | |
1377 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1378 | break; | |
e8b2dfe9 BS |
1379 | case IP_RECVORIGDSTADDR: |
1380 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1381 | break; | |
ad6f939a TH |
1382 | case IP_CHECKSUM: |
1383 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1384 | break; | |
70ecc248 WB |
1385 | case IP_RECVFRAGSIZE: |
1386 | val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; | |
1387 | break; | |
132adf54 SH |
1388 | case IP_TOS: |
1389 | val = inet->tos; | |
1390 | break; | |
1391 | case IP_TTL: | |
fa50d974 NB |
1392 | { |
1393 | struct net *net = sock_net(sk); | |
132adf54 | 1394 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1395 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1396 | inet->uc_ttl); |
1397 | break; | |
fa50d974 | 1398 | } |
132adf54 SH |
1399 | case IP_HDRINCL: |
1400 | val = inet->hdrincl; | |
1401 | break; | |
a89b4763 MK |
1402 | case IP_NODEFRAG: |
1403 | val = inet->nodefrag; | |
1404 | break; | |
90c337da ED |
1405 | case IP_BIND_ADDRESS_NO_PORT: |
1406 | val = inet->bind_address_no_port; | |
1407 | break; | |
132adf54 SH |
1408 | case IP_MTU_DISCOVER: |
1409 | val = inet->pmtudisc; | |
1410 | break; | |
1411 | case IP_MTU: | |
1412 | { | |
1413 | struct dst_entry *dst; | |
1414 | val = 0; | |
1415 | dst = sk_dst_get(sk); | |
1416 | if (dst) { | |
1417 | val = dst_mtu(dst); | |
1418 | dst_release(dst); | |
1da177e4 | 1419 | } |
132adf54 | 1420 | if (!val) { |
1da177e4 | 1421 | release_sock(sk); |
132adf54 | 1422 | return -ENOTCONN; |
1da177e4 | 1423 | } |
132adf54 SH |
1424 | break; |
1425 | } | |
1426 | case IP_RECVERR: | |
1427 | val = inet->recverr; | |
1428 | break; | |
1429 | case IP_MULTICAST_TTL: | |
1430 | val = inet->mc_ttl; | |
1431 | break; | |
1432 | case IP_MULTICAST_LOOP: | |
1433 | val = inet->mc_loop; | |
1434 | break; | |
76e21053 EH |
1435 | case IP_UNICAST_IF: |
1436 | val = (__force int)htonl((__u32) inet->uc_index); | |
1437 | break; | |
132adf54 SH |
1438 | case IP_MULTICAST_IF: |
1439 | { | |
1440 | struct in_addr addr; | |
1441 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1442 | addr.s_addr = inet->mc_addr; | |
1443 | release_sock(sk); | |
1da177e4 | 1444 | |
132adf54 SH |
1445 | if (put_user(len, optlen)) |
1446 | return -EFAULT; | |
1447 | if (copy_to_user(optval, &addr, len)) | |
1448 | return -EFAULT; | |
1449 | return 0; | |
1450 | } | |
1451 | case IP_MSFILTER: | |
1452 | { | |
1453 | struct ip_msfilter msf; | |
132adf54 SH |
1454 | |
1455 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1456 | err = -EINVAL; |
1457 | goto out; | |
1da177e4 | 1458 | } |
132adf54 | 1459 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1460 | err = -EFAULT; |
1461 | goto out; | |
1da177e4 | 1462 | } |
132adf54 SH |
1463 | err = ip_mc_msfget(sk, &msf, |
1464 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1465 | goto out; |
132adf54 SH |
1466 | } |
1467 | case MCAST_MSFILTER: | |
1468 | { | |
1469 | struct group_filter gsf; | |
1da177e4 | 1470 | |
132adf54 | 1471 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1472 | err = -EINVAL; |
1473 | goto out; | |
132adf54 SH |
1474 | } |
1475 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1476 | err = -EFAULT; |
1477 | goto out; | |
132adf54 SH |
1478 | } |
1479 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1480 | (struct group_filter __user *)optval, |
1481 | optlen); | |
87e9f031 | 1482 | goto out; |
132adf54 | 1483 | } |
f771bef9 NS |
1484 | case IP_MULTICAST_ALL: |
1485 | val = inet->mc_all; | |
1486 | break; | |
132adf54 SH |
1487 | case IP_PKTOPTIONS: |
1488 | { | |
1489 | struct msghdr msg; | |
1da177e4 | 1490 | |
132adf54 | 1491 | release_sock(sk); |
1da177e4 | 1492 | |
132adf54 SH |
1493 | if (sk->sk_type != SOCK_STREAM) |
1494 | return -ENOPROTOOPT; | |
1da177e4 | 1495 | |
c54a5e02 | 1496 | msg.msg_control = (__force void *) optval; |
132adf54 | 1497 | msg.msg_controllen = len; |
dd23198e | 1498 | msg.msg_flags = flags; |
1da177e4 | 1499 | |
132adf54 SH |
1500 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1501 | struct in_pktinfo info; | |
1502 | ||
c720c7e8 ED |
1503 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1504 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1505 | info.ipi_ifindex = inet->mc_index; |
1506 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1507 | } |
132adf54 SH |
1508 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1509 | int hlim = inet->mc_ttl; | |
1510 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1511 | } | |
4c507d28 JB |
1512 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1513 | int tos = inet->rcv_tos; | |
1514 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1515 | } | |
132adf54 SH |
1516 | len -= msg.msg_controllen; |
1517 | return put_user(len, optlen); | |
1518 | } | |
1519 | case IP_FREEBIND: | |
1520 | val = inet->freebind; | |
1521 | break; | |
f5715aea KK |
1522 | case IP_TRANSPARENT: |
1523 | val = inet->transparent; | |
1524 | break; | |
d218d111 SH |
1525 | case IP_MINTTL: |
1526 | val = inet->min_ttl; | |
1527 | break; | |
132adf54 SH |
1528 | default: |
1529 | release_sock(sk); | |
1530 | return -ENOPROTOOPT; | |
1da177e4 LT |
1531 | } |
1532 | release_sock(sk); | |
e905a9ed | 1533 | |
4d52cfbe | 1534 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1535 | unsigned char ucval = (unsigned char)val; |
1536 | len = 1; | |
132adf54 | 1537 | if (put_user(len, optlen)) |
1da177e4 | 1538 | return -EFAULT; |
09cb105e | 1539 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1540 | return -EFAULT; |
1541 | } else { | |
1542 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1543 | if (put_user(len, optlen)) |
1da177e4 | 1544 | return -EFAULT; |
09cb105e | 1545 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1546 | return -EFAULT; |
1547 | } | |
1548 | return 0; | |
87e9f031 WC |
1549 | |
1550 | out: | |
1551 | release_sock(sk); | |
1552 | if (needs_rtnl) | |
1553 | rtnl_unlock(); | |
1554 | return err; | |
1da177e4 LT |
1555 | } |
1556 | ||
3fdadf7d | 1557 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1558 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1559 | { |
1560 | int err; | |
1561 | ||
dd23198e | 1562 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1563 | #ifdef CONFIG_NETFILTER |
1564 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1565 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1566 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1567 | int len; |
3fdadf7d | 1568 | |
09cb105e | 1569 | if (get_user(len, optlen)) |
3fdadf7d DM |
1570 | return -EFAULT; |
1571 | ||
1572 | lock_sock(sk); | |
1573 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1574 | &len); | |
1575 | release_sock(sk); | |
1576 | if (err >= 0) | |
1577 | err = put_user(len, optlen); | |
1578 | return err; | |
1579 | } | |
1580 | #endif | |
1581 | return err; | |
1582 | } | |
4d52cfbe | 1583 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1584 | |
1585 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1586 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1587 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1588 | { |
42908c69 DS |
1589 | int err; |
1590 | ||
1591 | if (optname == MCAST_MSFILTER) | |
1592 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1593 | ip_getsockopt); | |
1594 | ||
dd23198e DB |
1595 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1596 | MSG_CMSG_COMPAT); | |
42908c69 | 1597 | |
3fdadf7d DM |
1598 | #ifdef CONFIG_NETFILTER |
1599 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1600 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1601 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1602 | int len; |
3fdadf7d | 1603 | |
543d9cfe | 1604 | if (get_user(len, optlen)) |
3fdadf7d DM |
1605 | return -EFAULT; |
1606 | ||
1607 | lock_sock(sk); | |
543d9cfe | 1608 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1609 | release_sock(sk); |
1610 | if (err >= 0) | |
1611 | err = put_user(len, optlen); | |
1612 | return err; | |
1613 | } | |
1614 | #endif | |
1615 | return err; | |
1616 | } | |
543d9cfe | 1617 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1618 | #endif |