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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The IP to API glue. | |
e905a9ed | 7 | * |
1da177e4 LT |
8 | * Authors: see ip.c |
9 | * | |
10 | * Fixes: | |
11 | * Many : Split from ip.c , see ip.c for history. | |
12 | * Martin Mares : TOS setting fixed. | |
e905a9ed | 13 | * Alan Cox : Fixed a couple of oopses in Martin's |
1da177e4 LT |
14 | * TOS tweaks. |
15 | * Mike McLagan : Routing by source | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/mm.h> | |
1da177e4 LT |
21 | #include <linux/skbuff.h> |
22 | #include <linux/ip.h> | |
23 | #include <linux/icmp.h> | |
14c85021 | 24 | #include <linux/inetdevice.h> |
1da177e4 | 25 | #include <linux/netdevice.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 LT |
27 | #include <net/sock.h> |
28 | #include <net/ip.h> | |
29 | #include <net/icmp.h> | |
d83d8461 | 30 | #include <net/tcp_states.h> |
1da177e4 LT |
31 | #include <linux/udp.h> |
32 | #include <linux/igmp.h> | |
33 | #include <linux/netfilter.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/mroute.h> | |
2c67e9ac | 36 | #include <net/inet_ecn.h> |
1da177e4 LT |
37 | #include <net/route.h> |
38 | #include <net/xfrm.h> | |
dae50295 | 39 | #include <net/compat.h> |
ad6f939a | 40 | #include <net/checksum.h> |
dfd56b8b | 41 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
42 | #include <net/transp_v6.h> |
43 | #endif | |
35ebf65e | 44 | #include <net/ip_fib.h> |
1da177e4 LT |
45 | |
46 | #include <linux/errqueue.h> | |
7c0f6ba6 | 47 | #include <linux/uaccess.h> |
1da177e4 | 48 | |
1da177e4 LT |
49 | /* |
50 | * SOL_IP control messages. | |
51 | */ | |
52 | ||
53 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
54 | { | |
d826eb14 | 55 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 56 | |
eddc9ec5 | 57 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
58 | |
59 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
60 | } | |
61 | ||
62 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
63 | { | |
eddc9ec5 | 64 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
65 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
66 | } | |
67 | ||
68 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
69 | { | |
eddc9ec5 | 70 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
71 | } |
72 | ||
73 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
74 | { | |
75 | if (IPCB(skb)->opt.optlen == 0) | |
76 | return; | |
77 | ||
eddc9ec5 ACM |
78 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
79 | ip_hdr(skb) + 1); | |
1da177e4 LT |
80 | } |
81 | ||
82 | ||
83 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
84 | { | |
85 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 86 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
87 | |
88 | if (IPCB(skb)->opt.optlen == 0) | |
89 | return; | |
90 | ||
91 | if (ip_options_echo(opt, skb)) { | |
92 | msg->msg_flags |= MSG_CTRUNC; | |
93 | return; | |
94 | } | |
95 | ip_options_undo(opt); | |
96 | ||
97 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
98 | } | |
99 | ||
70ecc248 WB |
100 | static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) |
101 | { | |
102 | int val; | |
103 | ||
104 | if (IPCB(skb)->frag_max_size == 0) | |
105 | return; | |
106 | ||
107 | val = IPCB(skb)->frag_max_size; | |
108 | put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); | |
109 | } | |
110 | ||
ad6f939a | 111 | static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, |
10df8e61 | 112 | int tlen, int offset) |
ad6f939a TH |
113 | { |
114 | __wsum csum = skb->csum; | |
115 | ||
116 | if (skb->ip_summed != CHECKSUM_COMPLETE) | |
117 | return; | |
118 | ||
119 | if (offset != 0) | |
10df8e61 ED |
120 | csum = csum_sub(csum, |
121 | csum_partial(skb_transport_header(skb) + tlen, | |
122 | offset, 0)); | |
ad6f939a TH |
123 | |
124 | put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); | |
125 | } | |
126 | ||
2c7946a7 CZ |
127 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
128 | { | |
129 | char *secdata; | |
dc49c1f9 | 130 | u32 seclen, secid; |
2c7946a7 CZ |
131 | int err; |
132 | ||
dc49c1f9 CZ |
133 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
134 | if (err) | |
135 | return; | |
136 | ||
137 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
138 | if (err) |
139 | return; | |
140 | ||
141 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 142 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
143 | } |
144 | ||
21d1a161 | 145 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
146 | { |
147 | struct sockaddr_in sin; | |
b71d1d42 | 148 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 149 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 | 150 | |
39b2dd76 | 151 | if (skb_transport_offset(skb) + 4 > (int)skb->len) |
e8b2dfe9 BS |
152 | return; |
153 | ||
154 | /* All current transport protocols have the port numbers in the | |
155 | * first four bytes of the transport header and this function is | |
156 | * written with this assumption in mind. | |
157 | */ | |
158 | ||
159 | sin.sin_family = AF_INET; | |
160 | sin.sin_addr.s_addr = iph->daddr; | |
161 | sin.sin_port = ports[1]; | |
162 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
163 | ||
164 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
165 | } | |
1da177e4 | 166 | |
ad959036 PA |
167 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
168 | struct sk_buff *skb, int tlen, int offset) | |
1da177e4 | 169 | { |
ad959036 | 170 | struct inet_sock *inet = inet_sk(sk); |
95c96174 | 171 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
172 | |
173 | /* Ordered by supposed usage frequency */ | |
c44d13d6 | 174 | if (flags & IP_CMSG_PKTINFO) { |
1da177e4 | 175 | ip_cmsg_recv_pktinfo(msg, skb); |
1da177e4 | 176 | |
c44d13d6 TH |
177 | flags &= ~IP_CMSG_PKTINFO; |
178 | if (!flags) | |
179 | return; | |
180 | } | |
181 | ||
182 | if (flags & IP_CMSG_TTL) { | |
1da177e4 | 183 | ip_cmsg_recv_ttl(msg, skb); |
1da177e4 | 184 | |
c44d13d6 TH |
185 | flags &= ~IP_CMSG_TTL; |
186 | if (!flags) | |
187 | return; | |
188 | } | |
189 | ||
190 | if (flags & IP_CMSG_TOS) { | |
1da177e4 | 191 | ip_cmsg_recv_tos(msg, skb); |
1da177e4 | 192 | |
c44d13d6 TH |
193 | flags &= ~IP_CMSG_TOS; |
194 | if (!flags) | |
195 | return; | |
196 | } | |
197 | ||
198 | if (flags & IP_CMSG_RECVOPTS) { | |
1da177e4 | 199 | ip_cmsg_recv_opts(msg, skb); |
1da177e4 | 200 | |
c44d13d6 TH |
201 | flags &= ~IP_CMSG_RECVOPTS; |
202 | if (!flags) | |
203 | return; | |
204 | } | |
205 | ||
206 | if (flags & IP_CMSG_RETOPTS) { | |
1da177e4 | 207 | ip_cmsg_recv_retopts(msg, skb); |
2c7946a7 | 208 | |
c44d13d6 TH |
209 | flags &= ~IP_CMSG_RETOPTS; |
210 | if (!flags) | |
211 | return; | |
212 | } | |
213 | ||
214 | if (flags & IP_CMSG_PASSSEC) { | |
2c7946a7 | 215 | ip_cmsg_recv_security(msg, skb); |
e8b2dfe9 | 216 | |
c44d13d6 TH |
217 | flags &= ~IP_CMSG_PASSSEC; |
218 | if (!flags) | |
219 | return; | |
220 | } | |
221 | ||
ad6f939a | 222 | if (flags & IP_CMSG_ORIGDSTADDR) { |
e8b2dfe9 BS |
223 | ip_cmsg_recv_dstaddr(msg, skb); |
224 | ||
ad6f939a TH |
225 | flags &= ~IP_CMSG_ORIGDSTADDR; |
226 | if (!flags) | |
227 | return; | |
228 | } | |
229 | ||
230 | if (flags & IP_CMSG_CHECKSUM) | |
10df8e61 | 231 | ip_cmsg_recv_checksum(msg, skb, tlen, offset); |
70ecc248 WB |
232 | |
233 | if (flags & IP_CMSG_RECVFRAGSIZE) | |
234 | ip_cmsg_recv_fragsize(msg, skb); | |
1da177e4 | 235 | } |
5961de9f | 236 | EXPORT_SYMBOL(ip_cmsg_recv_offset); |
1da177e4 | 237 | |
24025c46 | 238 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, |
c8e6ad08 | 239 | bool allow_ipv6) |
1da177e4 | 240 | { |
f02db315 | 241 | int err, val; |
1da177e4 | 242 | struct cmsghdr *cmsg; |
24025c46 | 243 | struct net *net = sock_net(sk); |
1da177e4 | 244 | |
f95b414e | 245 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
246 | if (!CMSG_OK(msg, cmsg)) |
247 | return -EINVAL; | |
5337b5b7 | 248 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
249 | if (allow_ipv6 && |
250 | cmsg->cmsg_level == SOL_IPV6 && | |
251 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
252 | struct in6_pktinfo *src_info; | |
253 | ||
254 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
255 | return -EINVAL; | |
256 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
257 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
258 | return -EINVAL; | |
259 | ipc->oif = src_info->ipi6_ifindex; | |
260 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; | |
261 | continue; | |
262 | } | |
263 | #endif | |
24025c46 | 264 | if (cmsg->cmsg_level == SOL_SOCKET) { |
2632616b ED |
265 | err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); |
266 | if (err) | |
267 | return err; | |
24025c46 SHY |
268 | continue; |
269 | } | |
270 | ||
1da177e4 LT |
271 | if (cmsg->cmsg_level != SOL_IP) |
272 | continue; | |
273 | switch (cmsg->cmsg_type) { | |
274 | case IP_RETOPTS: | |
275 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
91948309 ED |
276 | |
277 | /* Our caller is responsible for freeing ipc->opt */ | |
4d52cfbe ED |
278 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
279 | err < 40 ? err : 40); | |
1da177e4 LT |
280 | if (err) |
281 | return err; | |
282 | break; | |
283 | case IP_PKTINFO: | |
284 | { | |
285 | struct in_pktinfo *info; | |
286 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
287 | return -EINVAL; | |
288 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
289 | ipc->oif = info->ipi_ifindex; | |
290 | ipc->addr = info->ipi_spec_dst.s_addr; | |
291 | break; | |
292 | } | |
f02db315 FF |
293 | case IP_TTL: |
294 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
295 | return -EINVAL; | |
296 | val = *(int *)CMSG_DATA(cmsg); | |
297 | if (val < 1 || val > 255) | |
298 | return -EINVAL; | |
299 | ipc->ttl = val; | |
300 | break; | |
301 | case IP_TOS: | |
e895cdce ED |
302 | if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) |
303 | val = *(int *)CMSG_DATA(cmsg); | |
304 | else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) | |
305 | val = *(u8 *)CMSG_DATA(cmsg); | |
306 | else | |
f02db315 | 307 | return -EINVAL; |
f02db315 FF |
308 | if (val < 0 || val > 255) |
309 | return -EINVAL; | |
310 | ipc->tos = val; | |
311 | ipc->priority = rt_tos2priority(ipc->tos); | |
312 | break; | |
313 | ||
1da177e4 LT |
314 | default: |
315 | return -EINVAL; | |
316 | } | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
321 | ||
322 | /* Special input handler for packets caught by router alert option. | |
323 | They are selected only by protocol field, and then processed likely | |
324 | local ones; but only if someone wants them! Otherwise, router | |
325 | not running rsvpd will kill RSVP. | |
326 | ||
327 | It is user level problem, what it will make with them. | |
328 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
329 | but receiver should be enough clever f.e. to forward mtrace requests, | |
330 | sent to multicast group to reach destination designated router. | |
331 | */ | |
43a951e9 | 332 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
333 | static DEFINE_SPINLOCK(ip_ra_lock); |
334 | ||
592fcb9d ED |
335 | |
336 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 337 | { |
592fcb9d ED |
338 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
339 | ||
340 | sock_put(ra->saved_sk); | |
341 | kfree(ra); | |
66018506 | 342 | } |
1da177e4 | 343 | |
4d52cfbe ED |
344 | int ip_ra_control(struct sock *sk, unsigned char on, |
345 | void (*destructor)(struct sock *)) | |
1da177e4 | 346 | { |
43a951e9 ED |
347 | struct ip_ra_chain *ra, *new_ra; |
348 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 349 | |
c720c7e8 | 350 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
351 | return -EINVAL; |
352 | ||
353 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
354 | ||
66018506 | 355 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
356 | for (rap = &ip_ra_chain; |
357 | (ra = rcu_dereference_protected(*rap, | |
358 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
359 | rap = &ra->next) { | |
1da177e4 LT |
360 | if (ra->sk == sk) { |
361 | if (on) { | |
66018506 | 362 | spin_unlock_bh(&ip_ra_lock); |
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); |
66018506 | 369 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
370 | |
371 | if (ra->destructor) | |
372 | ra->destructor(sk); | |
592fcb9d ED |
373 | /* |
374 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
375 | * period. This guarantee ip_call_ra_chain() dont need | |
376 | * to mess with socket refcounts. | |
377 | */ | |
378 | ra->saved_sk = sk; | |
379 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
380 | return 0; |
381 | } | |
382 | } | |
51456b29 | 383 | if (!new_ra) { |
66018506 | 384 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
385 | return -ENOBUFS; |
386 | } | |
387 | new_ra->sk = sk; | |
388 | new_ra->destructor = destructor; | |
389 | ||
8e380f00 | 390 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 391 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 392 | sock_hold(sk); |
66018506 | 393 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
394 | |
395 | return 0; | |
396 | } | |
397 | ||
e905a9ed | 398 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 399 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 400 | { |
1da177e4 LT |
401 | struct sock_exterr_skb *serr; |
402 | ||
1da177e4 LT |
403 | skb = skb_clone(skb, GFP_ATOMIC); |
404 | if (!skb) | |
405 | return; | |
406 | ||
e905a9ed | 407 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
408 | serr->ee.ee_errno = err; |
409 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
410 | serr->ee.ee_type = icmp_hdr(skb)->type; |
411 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
412 | serr->ee.ee_pad = 0; |
413 | serr->ee.ee_info = info; | |
414 | serr->ee.ee_data = 0; | |
88c7664f | 415 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 416 | skb_network_header(skb); |
1da177e4 LT |
417 | serr->port = port; |
418 | ||
00db4124 | 419 | if (skb_pull(skb, payload - skb->data)) { |
bd82393c ACM |
420 | skb_reset_transport_header(skb); |
421 | if (sock_queue_err_skb(sk, skb) == 0) | |
422 | return; | |
423 | } | |
424 | kfree_skb(skb); | |
1da177e4 LT |
425 | } |
426 | ||
0579016e | 427 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
428 | { |
429 | struct inet_sock *inet = inet_sk(sk); | |
430 | struct sock_exterr_skb *serr; | |
431 | struct iphdr *iph; | |
432 | struct sk_buff *skb; | |
433 | ||
434 | if (!inet->recverr) | |
435 | return; | |
436 | ||
437 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
438 | if (!skb) | |
439 | return; | |
440 | ||
2ca9e6f2 ACM |
441 | skb_put(skb, sizeof(struct iphdr)); |
442 | skb_reset_network_header(skb); | |
eddc9ec5 | 443 | iph = ip_hdr(skb); |
1da177e4 LT |
444 | iph->daddr = daddr; |
445 | ||
e905a9ed | 446 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
447 | serr->ee.ee_errno = err; |
448 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 449 | serr->ee.ee_type = 0; |
1da177e4 LT |
450 | serr->ee.ee_code = 0; |
451 | serr->ee.ee_pad = 0; | |
452 | serr->ee.ee_info = info; | |
453 | serr->ee.ee_data = 0; | |
d56f90a7 | 454 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
455 | serr->port = port; |
456 | ||
27a884dc | 457 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 458 | skb_reset_transport_header(skb); |
1da177e4 LT |
459 | |
460 | if (sock_queue_err_skb(sk, skb)) | |
461 | kfree_skb(skb); | |
462 | } | |
463 | ||
34b99df4 JA |
464 | /* For some errors we have valid addr_offset even with zero payload and |
465 | * zero port. Also, addr_offset should be supported if port is set. | |
466 | */ | |
467 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
468 | { | |
469 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
470 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
471 | } | |
472 | ||
c247f053 WB |
473 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
474 | * | |
475 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
476 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
477 | */ | |
478 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
479 | struct sk_buff *skb, | |
480 | int ee_origin) | |
829ae9d6 | 481 | { |
c247f053 WB |
482 | struct in_pktinfo *info; |
483 | ||
484 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
485 | return true; | |
829ae9d6 | 486 | |
c247f053 WB |
487 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
488 | return false; | |
489 | ||
490 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
491 | * timestamp with egress dev. Not possible for packets without dev | |
492 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). | |
493 | */ | |
494 | if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || | |
829ae9d6 WB |
495 | (!skb->dev)) |
496 | return false; | |
497 | ||
c247f053 | 498 | info = PKTINFO_SKB_CB(skb); |
829ae9d6 WB |
499 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; |
500 | info->ipi_ifindex = skb->dev->ifindex; | |
501 | return true; | |
502 | } | |
503 | ||
e905a9ed | 504 | /* |
1da177e4 LT |
505 | * Handle MSG_ERRQUEUE |
506 | */ | |
85fbaa75 | 507 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
508 | { |
509 | struct sock_exterr_skb *serr; | |
364a9e93 | 510 | struct sk_buff *skb; |
342dfc30 | 511 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
512 | struct { |
513 | struct sock_extended_err ee; | |
514 | struct sockaddr_in offender; | |
515 | } errhdr; | |
516 | int err; | |
517 | int copied; | |
518 | ||
7ce875e5 WB |
519 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
520 | ||
1da177e4 | 521 | err = -EAGAIN; |
364a9e93 | 522 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 523 | if (!skb) |
1da177e4 LT |
524 | goto out; |
525 | ||
526 | copied = skb->len; | |
527 | if (copied > len) { | |
528 | msg->msg_flags |= MSG_TRUNC; | |
529 | copied = len; | |
530 | } | |
51f3d02b | 531 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
532 | if (unlikely(err)) { |
533 | kfree_skb(skb); | |
534 | return err; | |
535 | } | |
1da177e4 LT |
536 | sock_recv_timestamp(msg, sk, skb); |
537 | ||
538 | serr = SKB_EXT_ERR(skb); | |
539 | ||
34b99df4 | 540 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 541 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
542 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
543 | serr->addr_offset); | |
1da177e4 LT |
544 | sin->sin_port = serr->port; |
545 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 546 | *addr_len = sizeof(*sin); |
1da177e4 LT |
547 | } |
548 | ||
549 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
550 | sin = &errhdr.offender; | |
f812116b | 551 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 552 | |
c247f053 | 553 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 554 | sin->sin_family = AF_INET; |
eddc9ec5 | 555 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 556 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
557 | ip_cmsg_recv(msg, skb); |
558 | } | |
559 | ||
560 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
561 | ||
562 | /* Now we could try to dump offended packet options */ | |
563 | ||
564 | msg->msg_flags |= MSG_ERRQUEUE; | |
565 | err = copied; | |
566 | ||
960a2628 | 567 | consume_skb(skb); |
1da177e4 LT |
568 | out: |
569 | return err; | |
570 | } | |
571 | ||
572 | ||
573 | /* | |
4d52cfbe ED |
574 | * Socket option code for IP. This is the end of the line after any |
575 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 576 | */ |
baf606d9 MRL |
577 | static bool setsockopt_needs_rtnl(int optname) |
578 | { | |
579 | switch (optname) { | |
580 | case IP_ADD_MEMBERSHIP: | |
581 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 582 | case IP_BLOCK_SOURCE: |
baf606d9 | 583 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
584 | case IP_DROP_SOURCE_MEMBERSHIP: |
585 | case IP_MSFILTER: | |
586 | case IP_UNBLOCK_SOURCE: | |
587 | case MCAST_BLOCK_SOURCE: | |
588 | case MCAST_MSFILTER: | |
baf606d9 | 589 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 590 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 591 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
592 | case MCAST_LEAVE_SOURCE_GROUP: |
593 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
594 | return true; |
595 | } | |
596 | return false; | |
597 | } | |
1da177e4 | 598 | |
3fdadf7d | 599 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 600 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
601 | { |
602 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 603 | struct net *net = sock_net(sk); |
09cb105e | 604 | int val = 0, err; |
baf606d9 | 605 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 606 | |
0c9f79be XW |
607 | switch (optname) { |
608 | case IP_PKTINFO: | |
609 | case IP_RECVTTL: | |
610 | case IP_RECVOPTS: | |
611 | case IP_RECVTOS: | |
612 | case IP_RETOPTS: | |
613 | case IP_TOS: | |
614 | case IP_TTL: | |
615 | case IP_HDRINCL: | |
616 | case IP_MTU_DISCOVER: | |
617 | case IP_RECVERR: | |
618 | case IP_ROUTER_ALERT: | |
619 | case IP_FREEBIND: | |
620 | case IP_PASSSEC: | |
621 | case IP_TRANSPARENT: | |
622 | case IP_MINTTL: | |
623 | case IP_NODEFRAG: | |
90c337da | 624 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
625 | case IP_UNICAST_IF: |
626 | case IP_MULTICAST_TTL: | |
627 | case IP_MULTICAST_ALL: | |
628 | case IP_MULTICAST_LOOP: | |
629 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 630 | case IP_CHECKSUM: |
70ecc248 | 631 | case IP_RECVFRAGSIZE: |
1da177e4 LT |
632 | if (optlen >= sizeof(int)) { |
633 | if (get_user(val, (int __user *) optval)) | |
634 | return -EFAULT; | |
635 | } else if (optlen >= sizeof(char)) { | |
636 | unsigned char ucval; | |
637 | ||
638 | if (get_user(ucval, (unsigned char __user *) optval)) | |
639 | return -EFAULT; | |
640 | val = (int) ucval; | |
641 | } | |
642 | } | |
643 | ||
644 | /* If optlen==0, it is equivalent to val == 0 */ | |
645 | ||
6a9fb947 | 646 | if (ip_mroute_opt(optname)) |
09cb105e | 647 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
648 | |
649 | err = 0; | |
baf606d9 MRL |
650 | if (needs_rtnl) |
651 | rtnl_lock(); | |
1da177e4 LT |
652 | lock_sock(sk); |
653 | ||
654 | switch (optname) { | |
132adf54 SH |
655 | case IP_OPTIONS: |
656 | { | |
f6d8bd05 ED |
657 | struct ip_options_rcu *old, *opt = NULL; |
658 | ||
65a1c4ff | 659 | if (optlen > 40) |
132adf54 | 660 | goto e_inval; |
3b1e0a65 | 661 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 662 | optval, optlen); |
132adf54 SH |
663 | if (err) |
664 | break; | |
f6d8bd05 | 665 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 666 | lockdep_sock_is_held(sk)); |
132adf54 SH |
667 | if (inet->is_icsk) { |
668 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 669 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
670 | if (sk->sk_family == PF_INET || |
671 | (!((1 << sk->sk_state) & | |
672 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 673 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 674 | #endif |
f6d8bd05 ED |
675 | if (old) |
676 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 677 | if (opt) |
f6d8bd05 | 678 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 679 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 680 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 681 | } |
132adf54 | 682 | #endif |
1da177e4 | 683 | } |
f6d8bd05 ED |
684 | rcu_assign_pointer(inet->inet_opt, opt); |
685 | if (old) | |
605b4afe | 686 | kfree_rcu(old, rcu); |
132adf54 SH |
687 | break; |
688 | } | |
689 | case IP_PKTINFO: | |
690 | if (val) | |
691 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
692 | else | |
693 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
694 | break; | |
695 | case IP_RECVTTL: | |
696 | if (val) | |
697 | inet->cmsg_flags |= IP_CMSG_TTL; | |
698 | else | |
699 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
700 | break; | |
701 | case IP_RECVTOS: | |
702 | if (val) | |
703 | inet->cmsg_flags |= IP_CMSG_TOS; | |
704 | else | |
705 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
706 | break; | |
707 | case IP_RECVOPTS: | |
708 | if (val) | |
709 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
710 | else | |
711 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
712 | break; | |
713 | case IP_RETOPTS: | |
714 | if (val) | |
715 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
716 | else | |
717 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
718 | break; | |
719 | case IP_PASSSEC: | |
720 | if (val) | |
721 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
722 | else | |
723 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
724 | break; | |
e8b2dfe9 BS |
725 | case IP_RECVORIGDSTADDR: |
726 | if (val) | |
727 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
728 | else | |
729 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
730 | break; | |
ad6f939a TH |
731 | case IP_CHECKSUM: |
732 | if (val) { | |
733 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
734 | inet_inc_convert_csum(sk); | |
735 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
736 | } | |
737 | } else { | |
738 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
739 | inet_dec_convert_csum(sk); | |
740 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
741 | } | |
742 | } | |
743 | break; | |
70ecc248 WB |
744 | case IP_RECVFRAGSIZE: |
745 | if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) | |
746 | goto e_inval; | |
747 | if (val) | |
748 | inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; | |
749 | else | |
750 | inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; | |
751 | break; | |
132adf54 SH |
752 | case IP_TOS: /* This sets both TOS and Precedence */ |
753 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
754 | val &= ~INET_ECN_MASK; |
755 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 756 | } |
132adf54 SH |
757 | if (inet->tos != val) { |
758 | inet->tos = val; | |
759 | sk->sk_priority = rt_tos2priority(val); | |
760 | sk_dst_reset(sk); | |
761 | } | |
762 | break; | |
763 | case IP_TTL: | |
4d52cfbe | 764 | if (optlen < 1) |
132adf54 | 765 | goto e_inval; |
c9be4a5c | 766 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
767 | goto e_inval; |
768 | inet->uc_ttl = val; | |
769 | break; | |
770 | case IP_HDRINCL: | |
771 | if (sk->sk_type != SOCK_RAW) { | |
772 | err = -ENOPROTOOPT; | |
2c7946a7 | 773 | break; |
132adf54 SH |
774 | } |
775 | inet->hdrincl = val ? 1 : 0; | |
776 | break; | |
7b2ff18e JO |
777 | case IP_NODEFRAG: |
778 | if (sk->sk_type != SOCK_RAW) { | |
779 | err = -ENOPROTOOPT; | |
780 | break; | |
781 | } | |
782 | inet->nodefrag = val ? 1 : 0; | |
783 | break; | |
90c337da ED |
784 | case IP_BIND_ADDRESS_NO_PORT: |
785 | inet->bind_address_no_port = val ? 1 : 0; | |
786 | break; | |
132adf54 | 787 | case IP_MTU_DISCOVER: |
1b346576 | 788 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
789 | goto e_inval; |
790 | inet->pmtudisc = val; | |
791 | break; | |
792 | case IP_RECVERR: | |
793 | inet->recverr = !!val; | |
794 | if (!val) | |
795 | skb_queue_purge(&sk->sk_error_queue); | |
796 | break; | |
797 | case IP_MULTICAST_TTL: | |
798 | if (sk->sk_type == SOCK_STREAM) | |
799 | goto e_inval; | |
4d52cfbe | 800 | if (optlen < 1) |
132adf54 | 801 | goto e_inval; |
09cb105e | 802 | if (val == -1) |
132adf54 SH |
803 | val = 1; |
804 | if (val < 0 || val > 255) | |
805 | goto e_inval; | |
806 | inet->mc_ttl = val; | |
807 | break; | |
808 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 809 | if (optlen < 1) |
132adf54 SH |
810 | goto e_inval; |
811 | inet->mc_loop = !!val; | |
812 | break; | |
76e21053 EH |
813 | case IP_UNICAST_IF: |
814 | { | |
815 | struct net_device *dev = NULL; | |
816 | int ifindex; | |
817 | ||
818 | if (optlen != sizeof(int)) | |
819 | goto e_inval; | |
820 | ||
821 | ifindex = (__force int)ntohl((__force __be32)val); | |
822 | if (ifindex == 0) { | |
823 | inet->uc_index = 0; | |
824 | err = 0; | |
825 | break; | |
826 | } | |
827 | ||
828 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
829 | err = -EADDRNOTAVAIL; | |
830 | if (!dev) | |
831 | break; | |
832 | dev_put(dev); | |
833 | ||
834 | err = -EINVAL; | |
835 | if (sk->sk_bound_dev_if) | |
836 | break; | |
837 | ||
838 | inet->uc_index = ifindex; | |
839 | err = 0; | |
840 | break; | |
841 | } | |
132adf54 SH |
842 | case IP_MULTICAST_IF: |
843 | { | |
844 | struct ip_mreqn mreq; | |
845 | struct net_device *dev = NULL; | |
846 | ||
847 | if (sk->sk_type == SOCK_STREAM) | |
848 | goto e_inval; | |
849 | /* | |
850 | * Check the arguments are allowable | |
851 | */ | |
852 | ||
0915921b SW |
853 | if (optlen < sizeof(struct in_addr)) |
854 | goto e_inval; | |
855 | ||
132adf54 SH |
856 | err = -EFAULT; |
857 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 858 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 859 | break; |
132adf54 SH |
860 | } else { |
861 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
862 | if (optlen >= sizeof(struct ip_mreq)) { |
863 | if (copy_from_user(&mreq, optval, | |
864 | sizeof(struct ip_mreq))) | |
865 | break; | |
866 | } else if (optlen >= sizeof(struct in_addr)) { | |
867 | if (copy_from_user(&mreq.imr_address, optval, | |
868 | sizeof(struct in_addr))) | |
869 | break; | |
870 | } | |
132adf54 SH |
871 | } |
872 | ||
873 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 874 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
875 | inet->mc_index = 0; |
876 | inet->mc_addr = 0; | |
877 | err = 0; | |
1da177e4 LT |
878 | break; |
879 | } | |
3b1e0a65 | 880 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 881 | if (dev) |
132adf54 | 882 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 883 | } else |
55b80503 | 884 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 885 | |
1da177e4 | 886 | |
132adf54 SH |
887 | err = -EADDRNOTAVAIL; |
888 | if (!dev) | |
889 | break; | |
55b80503 | 890 | dev_put(dev); |
132adf54 SH |
891 | |
892 | err = -EINVAL; | |
893 | if (sk->sk_bound_dev_if && | |
894 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
895 | break; | |
1da177e4 | 896 | |
132adf54 SH |
897 | inet->mc_index = mreq.imr_ifindex; |
898 | inet->mc_addr = mreq.imr_address.s_addr; | |
899 | err = 0; | |
900 | break; | |
901 | } | |
1da177e4 | 902 | |
132adf54 SH |
903 | case IP_ADD_MEMBERSHIP: |
904 | case IP_DROP_MEMBERSHIP: | |
905 | { | |
906 | struct ip_mreqn mreq; | |
1da177e4 | 907 | |
a96fb49b FL |
908 | err = -EPROTO; |
909 | if (inet_sk(sk)->is_icsk) | |
910 | break; | |
911 | ||
132adf54 SH |
912 | if (optlen < sizeof(struct ip_mreq)) |
913 | goto e_inval; | |
914 | err = -EFAULT; | |
915 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 916 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 917 | break; |
132adf54 SH |
918 | } else { |
919 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 920 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 921 | break; |
132adf54 | 922 | } |
1da177e4 | 923 | |
132adf54 | 924 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 925 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 926 | else |
54ff9ef3 | 927 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
928 | break; |
929 | } | |
930 | case IP_MSFILTER: | |
931 | { | |
132adf54 SH |
932 | struct ip_msfilter *msf; |
933 | ||
934 | if (optlen < IP_MSFILTER_SIZE(0)) | |
935 | goto e_inval; | |
936 | if (optlen > sysctl_optmem_max) { | |
937 | err = -ENOBUFS; | |
1da177e4 LT |
938 | break; |
939 | } | |
132adf54 | 940 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 941 | if (!msf) { |
132adf54 SH |
942 | err = -ENOBUFS; |
943 | break; | |
944 | } | |
945 | err = -EFAULT; | |
946 | if (copy_from_user(msf, optval, optlen)) { | |
947 | kfree(msf); | |
948 | break; | |
949 | } | |
950 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
951 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 952 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
953 | kfree(msf); |
954 | err = -ENOBUFS; | |
955 | break; | |
956 | } | |
957 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
958 | kfree(msf); | |
959 | err = -EINVAL; | |
960 | break; | |
961 | } | |
962 | err = ip_mc_msfilter(sk, msf, 0); | |
963 | kfree(msf); | |
964 | break; | |
965 | } | |
966 | case IP_BLOCK_SOURCE: | |
967 | case IP_UNBLOCK_SOURCE: | |
968 | case IP_ADD_SOURCE_MEMBERSHIP: | |
969 | case IP_DROP_SOURCE_MEMBERSHIP: | |
970 | { | |
971 | struct ip_mreq_source mreqs; | |
972 | int omode, add; | |
1da177e4 | 973 | |
132adf54 SH |
974 | if (optlen != sizeof(struct ip_mreq_source)) |
975 | goto e_inval; | |
976 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 977 | err = -EFAULT; |
1da177e4 LT |
978 | break; |
979 | } | |
132adf54 SH |
980 | if (optname == IP_BLOCK_SOURCE) { |
981 | omode = MCAST_EXCLUDE; | |
982 | add = 1; | |
983 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
984 | omode = MCAST_EXCLUDE; | |
985 | add = 0; | |
986 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
987 | struct ip_mreqn mreq; | |
1da177e4 | 988 | |
132adf54 SH |
989 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
990 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
991 | mreq.imr_ifindex = 0; | |
54ff9ef3 | 992 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 993 | if (err && err != -EADDRINUSE) |
1da177e4 | 994 | break; |
132adf54 SH |
995 | omode = MCAST_INCLUDE; |
996 | add = 1; | |
997 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
998 | omode = MCAST_INCLUDE; | |
999 | add = 0; | |
1000 | } | |
1001 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
1002 | break; | |
1003 | } | |
1004 | case MCAST_JOIN_GROUP: | |
1005 | case MCAST_LEAVE_GROUP: | |
1006 | { | |
1007 | struct group_req greq; | |
1008 | struct sockaddr_in *psin; | |
1009 | struct ip_mreqn mreq; | |
1010 | ||
1011 | if (optlen < sizeof(struct group_req)) | |
1012 | goto e_inval; | |
1013 | err = -EFAULT; | |
1014 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
1015 | break; | |
1016 | psin = (struct sockaddr_in *)&greq.gr_group; | |
1017 | if (psin->sin_family != AF_INET) | |
1018 | goto e_inval; | |
1019 | memset(&mreq, 0, sizeof(mreq)); | |
1020 | mreq.imr_multiaddr = psin->sin_addr; | |
1021 | mreq.imr_ifindex = greq.gr_interface; | |
1022 | ||
1023 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 1024 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1025 | else |
54ff9ef3 | 1026 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1027 | break; |
1028 | } | |
1029 | case MCAST_JOIN_SOURCE_GROUP: | |
1030 | case MCAST_LEAVE_SOURCE_GROUP: | |
1031 | case MCAST_BLOCK_SOURCE: | |
1032 | case MCAST_UNBLOCK_SOURCE: | |
1033 | { | |
1034 | struct group_source_req greqs; | |
1035 | struct ip_mreq_source mreqs; | |
1036 | struct sockaddr_in *psin; | |
1037 | int omode, add; | |
1038 | ||
1039 | if (optlen != sizeof(struct group_source_req)) | |
1040 | goto e_inval; | |
1041 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1042 | err = -EFAULT; |
1da177e4 LT |
1043 | break; |
1044 | } | |
132adf54 SH |
1045 | if (greqs.gsr_group.ss_family != AF_INET || |
1046 | greqs.gsr_source.ss_family != AF_INET) { | |
1047 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1048 | break; |
1049 | } | |
132adf54 SH |
1050 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1051 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1052 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1053 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1054 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1055 | ||
1056 | if (optname == MCAST_BLOCK_SOURCE) { | |
1057 | omode = MCAST_EXCLUDE; | |
1058 | add = 1; | |
1059 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1060 | omode = MCAST_EXCLUDE; | |
1061 | add = 0; | |
1062 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1063 | struct ip_mreqn mreq; |
1064 | ||
132adf54 | 1065 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1066 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1067 | mreq.imr_address.s_addr = 0; |
1068 | mreq.imr_ifindex = greqs.gsr_interface; | |
54ff9ef3 | 1069 | err = ip_mc_join_group(sk, &mreq); |
132adf54 SH |
1070 | if (err && err != -EADDRINUSE) |
1071 | break; | |
1072 | greqs.gsr_interface = mreq.imr_ifindex; | |
1073 | omode = MCAST_INCLUDE; | |
1074 | add = 1; | |
1075 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1076 | omode = MCAST_INCLUDE; | |
1077 | add = 0; | |
1078 | } | |
1079 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1080 | greqs.gsr_interface); | |
1081 | break; | |
1082 | } | |
1083 | case MCAST_MSFILTER: | |
1084 | { | |
132adf54 SH |
1085 | struct sockaddr_in *psin; |
1086 | struct ip_msfilter *msf = NULL; | |
1087 | struct group_filter *gsf = NULL; | |
1088 | int msize, i, ifindex; | |
1089 | ||
1090 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1091 | goto e_inval; | |
1092 | if (optlen > sysctl_optmem_max) { | |
1093 | err = -ENOBUFS; | |
1da177e4 LT |
1094 | break; |
1095 | } | |
09cb105e | 1096 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 1097 | if (!gsf) { |
132adf54 | 1098 | err = -ENOBUFS; |
1da177e4 LT |
1099 | break; |
1100 | } | |
132adf54 | 1101 | err = -EFAULT; |
4d52cfbe | 1102 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 1103 | goto mc_msf_out; |
4d52cfbe | 1104 | |
132adf54 SH |
1105 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1106 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1107 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1108 | err = -ENOBUFS; |
1109 | goto mc_msf_out; | |
1110 | } | |
1111 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1112 | err = -EINVAL; | |
1113 | goto mc_msf_out; | |
1114 | } | |
1115 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1116 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1117 | if (!msf) { |
132adf54 SH |
1118 | err = -ENOBUFS; |
1119 | goto mc_msf_out; | |
1120 | } | |
1121 | ifindex = gsf->gf_interface; | |
1122 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1123 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1124 | err = -EADDRNOTAVAIL; |
132adf54 | 1125 | goto mc_msf_out; |
1da177e4 | 1126 | } |
132adf54 SH |
1127 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1128 | msf->imsf_interface = 0; | |
1129 | msf->imsf_fmode = gsf->gf_fmode; | |
1130 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1131 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1132 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1133 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1134 | |
132adf54 SH |
1135 | if (psin->sin_family != AF_INET) |
1136 | goto mc_msf_out; | |
1137 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1138 | } | |
1139 | kfree(gsf); | |
1140 | gsf = NULL; | |
1141 | ||
1142 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1143 | mc_msf_out: |
132adf54 SH |
1144 | kfree(msf); |
1145 | kfree(gsf); | |
1146 | break; | |
1147 | } | |
f771bef9 NS |
1148 | case IP_MULTICAST_ALL: |
1149 | if (optlen < 1) | |
1150 | goto e_inval; | |
1151 | if (val != 0 && val != 1) | |
1152 | goto e_inval; | |
1153 | inet->mc_all = val; | |
1154 | break; | |
132adf54 SH |
1155 | case IP_ROUTER_ALERT: |
1156 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1157 | break; | |
1158 | ||
1159 | case IP_FREEBIND: | |
4d52cfbe | 1160 | if (optlen < 1) |
132adf54 SH |
1161 | goto e_inval; |
1162 | inet->freebind = !!val; | |
1163 | break; | |
1164 | ||
1165 | case IP_IPSEC_POLICY: | |
1166 | case IP_XFRM_POLICY: | |
1167 | err = -EPERM; | |
52e804c6 | 1168 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1169 | break; |
132adf54 SH |
1170 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1171 | break; | |
1da177e4 | 1172 | |
f5715aea | 1173 | case IP_TRANSPARENT: |
52e804c6 EB |
1174 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1175 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1176 | err = -EPERM; |
1177 | break; | |
1178 | } | |
1179 | if (optlen < 1) | |
1180 | goto e_inval; | |
1181 | inet->transparent = !!val; | |
1182 | break; | |
1183 | ||
d218d111 SH |
1184 | case IP_MINTTL: |
1185 | if (optlen < 1) | |
1186 | goto e_inval; | |
1187 | if (val < 0 || val > 255) | |
1188 | goto e_inval; | |
1189 | inet->min_ttl = val; | |
1190 | break; | |
1191 | ||
132adf54 SH |
1192 | default: |
1193 | err = -ENOPROTOOPT; | |
1194 | break; | |
1da177e4 LT |
1195 | } |
1196 | release_sock(sk); | |
baf606d9 MRL |
1197 | if (needs_rtnl) |
1198 | rtnl_unlock(); | |
1da177e4 LT |
1199 | return err; |
1200 | ||
1201 | e_inval: | |
1202 | release_sock(sk); | |
baf606d9 MRL |
1203 | if (needs_rtnl) |
1204 | rtnl_unlock(); | |
1da177e4 LT |
1205 | return -EINVAL; |
1206 | } | |
1207 | ||
f84af32c | 1208 | /** |
829ae9d6 | 1209 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1210 | * @sk: socket |
1211 | * @skb: buffer | |
1212 | * | |
35ebf65e DM |
1213 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1214 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1215 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1216 | */ |
fbf8866d | 1217 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1218 | { |
d826eb14 | 1219 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1220 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1221 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1222 | |
4b261c75 | 1223 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1224 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1225 | * which has interface index (iif) as the first member of the | |
1226 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1227 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
1228 | * element so the iif is picked up from the prior IPCB | |
1229 | */ | |
35ebf65e | 1230 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1231 | } else { |
1232 | pktinfo->ipi_ifindex = 0; | |
1233 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1234 | } | |
1235 | skb_dst_drop(skb); | |
f84af32c | 1236 | } |
f84af32c | 1237 | |
3fdadf7d | 1238 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1239 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1240 | { |
1241 | int err; | |
1242 | ||
1243 | if (level != SOL_IP) | |
1244 | return -ENOPROTOOPT; | |
1245 | ||
1246 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1247 | #ifdef CONFIG_NETFILTER | |
1248 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1249 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1250 | optname != IP_IPSEC_POLICY && |
1251 | optname != IP_XFRM_POLICY && | |
1252 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1253 | lock_sock(sk); |
1254 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1255 | release_sock(sk); | |
1256 | } | |
1257 | #endif | |
1258 | return err; | |
1259 | } | |
4d52cfbe | 1260 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1261 | |
1262 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1263 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1264 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1265 | { |
1266 | int err; | |
1267 | ||
1268 | if (level != SOL_IP) | |
1269 | return -ENOPROTOOPT; | |
1270 | ||
dae50295 DS |
1271 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1272 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1273 | ip_setsockopt); | |
1274 | ||
3fdadf7d DM |
1275 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1276 | #ifdef CONFIG_NETFILTER | |
1277 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1278 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1279 | optname != IP_IPSEC_POLICY && |
1280 | optname != IP_XFRM_POLICY && | |
1281 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1282 | lock_sock(sk); |
543d9cfe ACM |
1283 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1284 | optval, optlen); | |
3fdadf7d DM |
1285 | release_sock(sk); |
1286 | } | |
1287 | #endif | |
1288 | return err; | |
1289 | } | |
543d9cfe | 1290 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1291 | #endif |
1292 | ||
1da177e4 | 1293 | /* |
4d52cfbe ED |
1294 | * Get the options. Note for future reference. The GET of IP options gets |
1295 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1296 | */ |
1297 | ||
87e9f031 WC |
1298 | static bool getsockopt_needs_rtnl(int optname) |
1299 | { | |
1300 | switch (optname) { | |
1301 | case IP_MSFILTER: | |
1302 | case MCAST_MSFILTER: | |
1303 | return true; | |
1304 | } | |
1305 | return false; | |
1306 | } | |
1307 | ||
3fdadf7d | 1308 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1309 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1310 | { |
1311 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1312 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1313 | int val, err = 0; | |
1da177e4 | 1314 | int len; |
e905a9ed | 1315 | |
132adf54 | 1316 | if (level != SOL_IP) |
1da177e4 LT |
1317 | return -EOPNOTSUPP; |
1318 | ||
6a9fb947 | 1319 | if (ip_mroute_opt(optname)) |
09cb105e | 1320 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1321 | |
09cb105e | 1322 | if (get_user(len, optlen)) |
1da177e4 | 1323 | return -EFAULT; |
132adf54 | 1324 | if (len < 0) |
1da177e4 | 1325 | return -EINVAL; |
e905a9ed | 1326 | |
87e9f031 WC |
1327 | if (needs_rtnl) |
1328 | rtnl_lock(); | |
1da177e4 LT |
1329 | lock_sock(sk); |
1330 | ||
132adf54 SH |
1331 | switch (optname) { |
1332 | case IP_OPTIONS: | |
1333 | { | |
1334 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1335 | struct ip_options *opt = (struct ip_options *)optbuf; |
1336 | struct ip_options_rcu *inet_opt; | |
1337 | ||
1338 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1339 | lockdep_sock_is_held(sk)); |
132adf54 | 1340 | opt->optlen = 0; |
f6d8bd05 ED |
1341 | if (inet_opt) |
1342 | memcpy(optbuf, &inet_opt->opt, | |
1343 | sizeof(struct ip_options) + | |
1344 | inet_opt->opt.optlen); | |
132adf54 SH |
1345 | release_sock(sk); |
1346 | ||
1347 | if (opt->optlen == 0) | |
1348 | return put_user(0, optlen); | |
1349 | ||
1350 | ip_options_undo(opt); | |
1351 | ||
1352 | len = min_t(unsigned int, len, opt->optlen); | |
1353 | if (put_user(len, optlen)) | |
1354 | return -EFAULT; | |
1355 | if (copy_to_user(optval, opt->__data, len)) | |
1356 | return -EFAULT; | |
1357 | return 0; | |
1358 | } | |
1359 | case IP_PKTINFO: | |
1360 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1361 | break; | |
1362 | case IP_RECVTTL: | |
1363 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1364 | break; | |
1365 | case IP_RECVTOS: | |
1366 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1367 | break; | |
1368 | case IP_RECVOPTS: | |
1369 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1370 | break; | |
1371 | case IP_RETOPTS: | |
1372 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1373 | break; | |
1374 | case IP_PASSSEC: | |
1375 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1376 | break; | |
e8b2dfe9 BS |
1377 | case IP_RECVORIGDSTADDR: |
1378 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1379 | break; | |
ad6f939a TH |
1380 | case IP_CHECKSUM: |
1381 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1382 | break; | |
70ecc248 WB |
1383 | case IP_RECVFRAGSIZE: |
1384 | val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; | |
1385 | break; | |
132adf54 SH |
1386 | case IP_TOS: |
1387 | val = inet->tos; | |
1388 | break; | |
1389 | case IP_TTL: | |
fa50d974 NB |
1390 | { |
1391 | struct net *net = sock_net(sk); | |
132adf54 | 1392 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1393 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1394 | inet->uc_ttl); |
1395 | break; | |
fa50d974 | 1396 | } |
132adf54 SH |
1397 | case IP_HDRINCL: |
1398 | val = inet->hdrincl; | |
1399 | break; | |
a89b4763 MK |
1400 | case IP_NODEFRAG: |
1401 | val = inet->nodefrag; | |
1402 | break; | |
90c337da ED |
1403 | case IP_BIND_ADDRESS_NO_PORT: |
1404 | val = inet->bind_address_no_port; | |
1405 | break; | |
132adf54 SH |
1406 | case IP_MTU_DISCOVER: |
1407 | val = inet->pmtudisc; | |
1408 | break; | |
1409 | case IP_MTU: | |
1410 | { | |
1411 | struct dst_entry *dst; | |
1412 | val = 0; | |
1413 | dst = sk_dst_get(sk); | |
1414 | if (dst) { | |
1415 | val = dst_mtu(dst); | |
1416 | dst_release(dst); | |
1da177e4 | 1417 | } |
132adf54 | 1418 | if (!val) { |
1da177e4 | 1419 | release_sock(sk); |
132adf54 | 1420 | return -ENOTCONN; |
1da177e4 | 1421 | } |
132adf54 SH |
1422 | break; |
1423 | } | |
1424 | case IP_RECVERR: | |
1425 | val = inet->recverr; | |
1426 | break; | |
1427 | case IP_MULTICAST_TTL: | |
1428 | val = inet->mc_ttl; | |
1429 | break; | |
1430 | case IP_MULTICAST_LOOP: | |
1431 | val = inet->mc_loop; | |
1432 | break; | |
76e21053 EH |
1433 | case IP_UNICAST_IF: |
1434 | val = (__force int)htonl((__u32) inet->uc_index); | |
1435 | break; | |
132adf54 SH |
1436 | case IP_MULTICAST_IF: |
1437 | { | |
1438 | struct in_addr addr; | |
1439 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1440 | addr.s_addr = inet->mc_addr; | |
1441 | release_sock(sk); | |
1da177e4 | 1442 | |
132adf54 SH |
1443 | if (put_user(len, optlen)) |
1444 | return -EFAULT; | |
1445 | if (copy_to_user(optval, &addr, len)) | |
1446 | return -EFAULT; | |
1447 | return 0; | |
1448 | } | |
1449 | case IP_MSFILTER: | |
1450 | { | |
1451 | struct ip_msfilter msf; | |
132adf54 SH |
1452 | |
1453 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1454 | err = -EINVAL; |
1455 | goto out; | |
1da177e4 | 1456 | } |
132adf54 | 1457 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1458 | err = -EFAULT; |
1459 | goto out; | |
1da177e4 | 1460 | } |
132adf54 SH |
1461 | err = ip_mc_msfget(sk, &msf, |
1462 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1463 | goto out; |
132adf54 SH |
1464 | } |
1465 | case MCAST_MSFILTER: | |
1466 | { | |
1467 | struct group_filter gsf; | |
1da177e4 | 1468 | |
132adf54 | 1469 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1470 | err = -EINVAL; |
1471 | goto out; | |
132adf54 SH |
1472 | } |
1473 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1474 | err = -EFAULT; |
1475 | goto out; | |
132adf54 SH |
1476 | } |
1477 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1478 | (struct group_filter __user *)optval, |
1479 | optlen); | |
87e9f031 | 1480 | goto out; |
132adf54 | 1481 | } |
f771bef9 NS |
1482 | case IP_MULTICAST_ALL: |
1483 | val = inet->mc_all; | |
1484 | break; | |
132adf54 SH |
1485 | case IP_PKTOPTIONS: |
1486 | { | |
1487 | struct msghdr msg; | |
1da177e4 | 1488 | |
132adf54 | 1489 | release_sock(sk); |
1da177e4 | 1490 | |
132adf54 SH |
1491 | if (sk->sk_type != SOCK_STREAM) |
1492 | return -ENOPROTOOPT; | |
1da177e4 | 1493 | |
c54a5e02 | 1494 | msg.msg_control = (__force void *) optval; |
132adf54 | 1495 | msg.msg_controllen = len; |
dd23198e | 1496 | msg.msg_flags = flags; |
1da177e4 | 1497 | |
132adf54 SH |
1498 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1499 | struct in_pktinfo info; | |
1500 | ||
c720c7e8 ED |
1501 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1502 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1503 | info.ipi_ifindex = inet->mc_index; |
1504 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1505 | } |
132adf54 SH |
1506 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1507 | int hlim = inet->mc_ttl; | |
1508 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1509 | } | |
4c507d28 JB |
1510 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1511 | int tos = inet->rcv_tos; | |
1512 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1513 | } | |
132adf54 SH |
1514 | len -= msg.msg_controllen; |
1515 | return put_user(len, optlen); | |
1516 | } | |
1517 | case IP_FREEBIND: | |
1518 | val = inet->freebind; | |
1519 | break; | |
f5715aea KK |
1520 | case IP_TRANSPARENT: |
1521 | val = inet->transparent; | |
1522 | break; | |
d218d111 SH |
1523 | case IP_MINTTL: |
1524 | val = inet->min_ttl; | |
1525 | break; | |
132adf54 SH |
1526 | default: |
1527 | release_sock(sk); | |
1528 | return -ENOPROTOOPT; | |
1da177e4 LT |
1529 | } |
1530 | release_sock(sk); | |
e905a9ed | 1531 | |
4d52cfbe | 1532 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1533 | unsigned char ucval = (unsigned char)val; |
1534 | len = 1; | |
132adf54 | 1535 | if (put_user(len, optlen)) |
1da177e4 | 1536 | return -EFAULT; |
09cb105e | 1537 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1538 | return -EFAULT; |
1539 | } else { | |
1540 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1541 | if (put_user(len, optlen)) |
1da177e4 | 1542 | return -EFAULT; |
09cb105e | 1543 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1544 | return -EFAULT; |
1545 | } | |
1546 | return 0; | |
87e9f031 WC |
1547 | |
1548 | out: | |
1549 | release_sock(sk); | |
1550 | if (needs_rtnl) | |
1551 | rtnl_unlock(); | |
1552 | return err; | |
1da177e4 LT |
1553 | } |
1554 | ||
3fdadf7d | 1555 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1556 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1557 | { |
1558 | int err; | |
1559 | ||
dd23198e | 1560 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1561 | #ifdef CONFIG_NETFILTER |
1562 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1563 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1564 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1565 | int len; |
3fdadf7d | 1566 | |
09cb105e | 1567 | if (get_user(len, optlen)) |
3fdadf7d DM |
1568 | return -EFAULT; |
1569 | ||
1570 | lock_sock(sk); | |
1571 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1572 | &len); | |
1573 | release_sock(sk); | |
1574 | if (err >= 0) | |
1575 | err = put_user(len, optlen); | |
1576 | return err; | |
1577 | } | |
1578 | #endif | |
1579 | return err; | |
1580 | } | |
4d52cfbe | 1581 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1582 | |
1583 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1584 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1585 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1586 | { |
42908c69 DS |
1587 | int err; |
1588 | ||
1589 | if (optname == MCAST_MSFILTER) | |
1590 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1591 | ip_getsockopt); | |
1592 | ||
dd23198e DB |
1593 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1594 | MSG_CMSG_COMPAT); | |
42908c69 | 1595 | |
3fdadf7d DM |
1596 | #ifdef CONFIG_NETFILTER |
1597 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1598 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1599 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1600 | int len; |
3fdadf7d | 1601 | |
543d9cfe | 1602 | if (get_user(len, optlen)) |
3fdadf7d DM |
1603 | return -EFAULT; |
1604 | ||
1605 | lock_sock(sk); | |
543d9cfe | 1606 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1607 | release_sock(sk); |
1608 | if (err >= 0) | |
1609 | err = put_user(len, optlen); | |
1610 | return err; | |
1611 | } | |
1612 | #endif | |
1613 | return err; | |
1614 | } | |
543d9cfe | 1615 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1616 | #endif |