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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The IP to API glue. | |
e905a9ed | 7 | * |
1da177e4 LT |
8 | * Authors: see ip.c |
9 | * | |
10 | * Fixes: | |
11 | * Many : Split from ip.c , see ip.c for history. | |
12 | * Martin Mares : TOS setting fixed. | |
e905a9ed | 13 | * Alan Cox : Fixed a couple of oopses in Martin's |
1da177e4 LT |
14 | * TOS tweaks. |
15 | * Mike McLagan : Routing by source | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/mm.h> | |
1da177e4 LT |
21 | #include <linux/skbuff.h> |
22 | #include <linux/ip.h> | |
23 | #include <linux/icmp.h> | |
14c85021 | 24 | #include <linux/inetdevice.h> |
1da177e4 | 25 | #include <linux/netdevice.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 LT |
27 | #include <net/sock.h> |
28 | #include <net/ip.h> | |
29 | #include <net/icmp.h> | |
d83d8461 | 30 | #include <net/tcp_states.h> |
1da177e4 LT |
31 | #include <linux/udp.h> |
32 | #include <linux/igmp.h> | |
33 | #include <linux/netfilter.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/mroute.h> | |
2c67e9ac | 36 | #include <net/inet_ecn.h> |
1da177e4 LT |
37 | #include <net/route.h> |
38 | #include <net/xfrm.h> | |
dae50295 | 39 | #include <net/compat.h> |
ad6f939a | 40 | #include <net/checksum.h> |
dfd56b8b | 41 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
42 | #include <net/transp_v6.h> |
43 | #endif | |
35ebf65e | 44 | #include <net/ip_fib.h> |
1da177e4 LT |
45 | |
46 | #include <linux/errqueue.h> | |
47 | #include <asm/uaccess.h> | |
48 | ||
1da177e4 LT |
49 | /* |
50 | * SOL_IP control messages. | |
51 | */ | |
52 | ||
53 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
54 | { | |
d826eb14 | 55 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 56 | |
eddc9ec5 | 57 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
58 | |
59 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
60 | } | |
61 | ||
62 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
63 | { | |
eddc9ec5 | 64 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
65 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
66 | } | |
67 | ||
68 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
69 | { | |
eddc9ec5 | 70 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
71 | } |
72 | ||
73 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
74 | { | |
75 | if (IPCB(skb)->opt.optlen == 0) | |
76 | return; | |
77 | ||
eddc9ec5 ACM |
78 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
79 | ip_hdr(skb) + 1); | |
1da177e4 LT |
80 | } |
81 | ||
82 | ||
83 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
84 | { | |
85 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 86 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
87 | |
88 | if (IPCB(skb)->opt.optlen == 0) | |
89 | return; | |
90 | ||
91 | if (ip_options_echo(opt, skb)) { | |
92 | msg->msg_flags |= MSG_CTRUNC; | |
93 | return; | |
94 | } | |
95 | ip_options_undo(opt); | |
96 | ||
97 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
98 | } | |
99 | ||
ad6f939a TH |
100 | static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, |
101 | int offset) | |
102 | { | |
103 | __wsum csum = skb->csum; | |
104 | ||
105 | if (skb->ip_summed != CHECKSUM_COMPLETE) | |
106 | return; | |
107 | ||
108 | if (offset != 0) | |
31c2e492 WB |
109 | csum = csum_sub(csum, csum_partial(skb_transport_header(skb), |
110 | offset, 0)); | |
ad6f939a TH |
111 | |
112 | put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); | |
113 | } | |
114 | ||
2c7946a7 CZ |
115 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
116 | { | |
117 | char *secdata; | |
dc49c1f9 | 118 | u32 seclen, secid; |
2c7946a7 CZ |
119 | int err; |
120 | ||
dc49c1f9 CZ |
121 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
122 | if (err) | |
123 | return; | |
124 | ||
125 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
126 | if (err) |
127 | return; | |
128 | ||
129 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 130 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
131 | } |
132 | ||
21d1a161 | 133 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
134 | { |
135 | struct sockaddr_in sin; | |
b71d1d42 | 136 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 137 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
138 | |
139 | if (skb_transport_offset(skb) + 4 > skb->len) | |
140 | return; | |
141 | ||
142 | /* All current transport protocols have the port numbers in the | |
143 | * first four bytes of the transport header and this function is | |
144 | * written with this assumption in mind. | |
145 | */ | |
146 | ||
147 | sin.sin_family = AF_INET; | |
148 | sin.sin_addr.s_addr = iph->daddr; | |
149 | sin.sin_port = ports[1]; | |
150 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
151 | ||
152 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
153 | } | |
1da177e4 | 154 | |
5961de9f TH |
155 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, |
156 | int offset) | |
1da177e4 LT |
157 | { |
158 | struct inet_sock *inet = inet_sk(skb->sk); | |
95c96174 | 159 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
160 | |
161 | /* Ordered by supposed usage frequency */ | |
c44d13d6 | 162 | if (flags & IP_CMSG_PKTINFO) { |
1da177e4 | 163 | ip_cmsg_recv_pktinfo(msg, skb); |
1da177e4 | 164 | |
c44d13d6 TH |
165 | flags &= ~IP_CMSG_PKTINFO; |
166 | if (!flags) | |
167 | return; | |
168 | } | |
169 | ||
170 | if (flags & IP_CMSG_TTL) { | |
1da177e4 | 171 | ip_cmsg_recv_ttl(msg, skb); |
1da177e4 | 172 | |
c44d13d6 TH |
173 | flags &= ~IP_CMSG_TTL; |
174 | if (!flags) | |
175 | return; | |
176 | } | |
177 | ||
178 | if (flags & IP_CMSG_TOS) { | |
1da177e4 | 179 | ip_cmsg_recv_tos(msg, skb); |
1da177e4 | 180 | |
c44d13d6 TH |
181 | flags &= ~IP_CMSG_TOS; |
182 | if (!flags) | |
183 | return; | |
184 | } | |
185 | ||
186 | if (flags & IP_CMSG_RECVOPTS) { | |
1da177e4 | 187 | ip_cmsg_recv_opts(msg, skb); |
1da177e4 | 188 | |
c44d13d6 TH |
189 | flags &= ~IP_CMSG_RECVOPTS; |
190 | if (!flags) | |
191 | return; | |
192 | } | |
193 | ||
194 | if (flags & IP_CMSG_RETOPTS) { | |
1da177e4 | 195 | ip_cmsg_recv_retopts(msg, skb); |
2c7946a7 | 196 | |
c44d13d6 TH |
197 | flags &= ~IP_CMSG_RETOPTS; |
198 | if (!flags) | |
199 | return; | |
200 | } | |
201 | ||
202 | if (flags & IP_CMSG_PASSSEC) { | |
2c7946a7 | 203 | ip_cmsg_recv_security(msg, skb); |
e8b2dfe9 | 204 | |
c44d13d6 TH |
205 | flags &= ~IP_CMSG_PASSSEC; |
206 | if (!flags) | |
207 | return; | |
208 | } | |
209 | ||
ad6f939a | 210 | if (flags & IP_CMSG_ORIGDSTADDR) { |
e8b2dfe9 BS |
211 | ip_cmsg_recv_dstaddr(msg, skb); |
212 | ||
ad6f939a TH |
213 | flags &= ~IP_CMSG_ORIGDSTADDR; |
214 | if (!flags) | |
215 | return; | |
216 | } | |
217 | ||
218 | if (flags & IP_CMSG_CHECKSUM) | |
219 | ip_cmsg_recv_checksum(msg, skb, offset); | |
1da177e4 | 220 | } |
5961de9f | 221 | EXPORT_SYMBOL(ip_cmsg_recv_offset); |
1da177e4 | 222 | |
24025c46 | 223 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, |
c8e6ad08 | 224 | bool allow_ipv6) |
1da177e4 | 225 | { |
f02db315 | 226 | int err, val; |
1da177e4 | 227 | struct cmsghdr *cmsg; |
24025c46 | 228 | struct net *net = sock_net(sk); |
1da177e4 | 229 | |
f95b414e | 230 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
231 | if (!CMSG_OK(msg, cmsg)) |
232 | return -EINVAL; | |
5337b5b7 | 233 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
234 | if (allow_ipv6 && |
235 | cmsg->cmsg_level == SOL_IPV6 && | |
236 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
237 | struct in6_pktinfo *src_info; | |
238 | ||
239 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
240 | return -EINVAL; | |
241 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
242 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
243 | return -EINVAL; | |
244 | ipc->oif = src_info->ipi6_ifindex; | |
245 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; | |
246 | continue; | |
247 | } | |
248 | #endif | |
24025c46 SHY |
249 | if (cmsg->cmsg_level == SOL_SOCKET) { |
250 | if (__sock_cmsg_send(sk, msg, cmsg, &ipc->sockc)) | |
251 | return -EINVAL; | |
252 | continue; | |
253 | } | |
254 | ||
1da177e4 LT |
255 | if (cmsg->cmsg_level != SOL_IP) |
256 | continue; | |
257 | switch (cmsg->cmsg_type) { | |
258 | case IP_RETOPTS: | |
259 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
91948309 ED |
260 | |
261 | /* Our caller is responsible for freeing ipc->opt */ | |
4d52cfbe ED |
262 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
263 | err < 40 ? err : 40); | |
1da177e4 LT |
264 | if (err) |
265 | return err; | |
266 | break; | |
267 | case IP_PKTINFO: | |
268 | { | |
269 | struct in_pktinfo *info; | |
270 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
271 | return -EINVAL; | |
272 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
273 | ipc->oif = info->ipi_ifindex; | |
274 | ipc->addr = info->ipi_spec_dst.s_addr; | |
275 | break; | |
276 | } | |
f02db315 FF |
277 | case IP_TTL: |
278 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
279 | return -EINVAL; | |
280 | val = *(int *)CMSG_DATA(cmsg); | |
281 | if (val < 1 || val > 255) | |
282 | return -EINVAL; | |
283 | ipc->ttl = val; | |
284 | break; | |
285 | case IP_TOS: | |
286 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
287 | return -EINVAL; | |
288 | val = *(int *)CMSG_DATA(cmsg); | |
289 | if (val < 0 || val > 255) | |
290 | return -EINVAL; | |
291 | ipc->tos = val; | |
292 | ipc->priority = rt_tos2priority(ipc->tos); | |
293 | break; | |
294 | ||
1da177e4 LT |
295 | default: |
296 | return -EINVAL; | |
297 | } | |
298 | } | |
299 | return 0; | |
300 | } | |
301 | ||
302 | ||
303 | /* Special input handler for packets caught by router alert option. | |
304 | They are selected only by protocol field, and then processed likely | |
305 | local ones; but only if someone wants them! Otherwise, router | |
306 | not running rsvpd will kill RSVP. | |
307 | ||
308 | It is user level problem, what it will make with them. | |
309 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
310 | but receiver should be enough clever f.e. to forward mtrace requests, | |
311 | sent to multicast group to reach destination designated router. | |
312 | */ | |
43a951e9 | 313 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
314 | static DEFINE_SPINLOCK(ip_ra_lock); |
315 | ||
592fcb9d ED |
316 | |
317 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 318 | { |
592fcb9d ED |
319 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
320 | ||
321 | sock_put(ra->saved_sk); | |
322 | kfree(ra); | |
66018506 | 323 | } |
1da177e4 | 324 | |
4d52cfbe ED |
325 | int ip_ra_control(struct sock *sk, unsigned char on, |
326 | void (*destructor)(struct sock *)) | |
1da177e4 | 327 | { |
43a951e9 ED |
328 | struct ip_ra_chain *ra, *new_ra; |
329 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 330 | |
c720c7e8 | 331 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
332 | return -EINVAL; |
333 | ||
334 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
335 | ||
66018506 | 336 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
337 | for (rap = &ip_ra_chain; |
338 | (ra = rcu_dereference_protected(*rap, | |
339 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
340 | rap = &ra->next) { | |
1da177e4 LT |
341 | if (ra->sk == sk) { |
342 | if (on) { | |
66018506 | 343 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 344 | kfree(new_ra); |
1da177e4 LT |
345 | return -EADDRINUSE; |
346 | } | |
592fcb9d ED |
347 | /* dont let ip_call_ra_chain() use sk again */ |
348 | ra->sk = NULL; | |
8e380f00 | 349 | RCU_INIT_POINTER(*rap, ra->next); |
66018506 | 350 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
351 | |
352 | if (ra->destructor) | |
353 | ra->destructor(sk); | |
592fcb9d ED |
354 | /* |
355 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
356 | * period. This guarantee ip_call_ra_chain() dont need | |
357 | * to mess with socket refcounts. | |
358 | */ | |
359 | ra->saved_sk = sk; | |
360 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
361 | return 0; |
362 | } | |
363 | } | |
51456b29 | 364 | if (!new_ra) { |
66018506 | 365 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
366 | return -ENOBUFS; |
367 | } | |
368 | new_ra->sk = sk; | |
369 | new_ra->destructor = destructor; | |
370 | ||
8e380f00 | 371 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 372 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 373 | sock_hold(sk); |
66018506 | 374 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
e905a9ed | 379 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 380 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 381 | { |
1da177e4 LT |
382 | struct sock_exterr_skb *serr; |
383 | ||
1da177e4 LT |
384 | skb = skb_clone(skb, GFP_ATOMIC); |
385 | if (!skb) | |
386 | return; | |
387 | ||
e905a9ed | 388 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
389 | serr->ee.ee_errno = err; |
390 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
391 | serr->ee.ee_type = icmp_hdr(skb)->type; |
392 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
393 | serr->ee.ee_pad = 0; |
394 | serr->ee.ee_info = info; | |
395 | serr->ee.ee_data = 0; | |
88c7664f | 396 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 397 | skb_network_header(skb); |
1da177e4 LT |
398 | serr->port = port; |
399 | ||
00db4124 | 400 | if (skb_pull(skb, payload - skb->data)) { |
bd82393c ACM |
401 | skb_reset_transport_header(skb); |
402 | if (sock_queue_err_skb(sk, skb) == 0) | |
403 | return; | |
404 | } | |
405 | kfree_skb(skb); | |
1da177e4 LT |
406 | } |
407 | ||
0579016e | 408 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
409 | { |
410 | struct inet_sock *inet = inet_sk(sk); | |
411 | struct sock_exterr_skb *serr; | |
412 | struct iphdr *iph; | |
413 | struct sk_buff *skb; | |
414 | ||
415 | if (!inet->recverr) | |
416 | return; | |
417 | ||
418 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
419 | if (!skb) | |
420 | return; | |
421 | ||
2ca9e6f2 ACM |
422 | skb_put(skb, sizeof(struct iphdr)); |
423 | skb_reset_network_header(skb); | |
eddc9ec5 | 424 | iph = ip_hdr(skb); |
1da177e4 LT |
425 | iph->daddr = daddr; |
426 | ||
e905a9ed | 427 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
428 | serr->ee.ee_errno = err; |
429 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 430 | serr->ee.ee_type = 0; |
1da177e4 LT |
431 | serr->ee.ee_code = 0; |
432 | serr->ee.ee_pad = 0; | |
433 | serr->ee.ee_info = info; | |
434 | serr->ee.ee_data = 0; | |
d56f90a7 | 435 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
436 | serr->port = port; |
437 | ||
27a884dc | 438 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 439 | skb_reset_transport_header(skb); |
1da177e4 LT |
440 | |
441 | if (sock_queue_err_skb(sk, skb)) | |
442 | kfree_skb(skb); | |
443 | } | |
444 | ||
34b99df4 JA |
445 | /* For some errors we have valid addr_offset even with zero payload and |
446 | * zero port. Also, addr_offset should be supported if port is set. | |
447 | */ | |
448 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
449 | { | |
450 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
451 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
452 | } | |
453 | ||
c247f053 WB |
454 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
455 | * | |
456 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
457 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
458 | */ | |
459 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
460 | struct sk_buff *skb, | |
461 | int ee_origin) | |
829ae9d6 | 462 | { |
c247f053 WB |
463 | struct in_pktinfo *info; |
464 | ||
465 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
466 | return true; | |
829ae9d6 | 467 | |
c247f053 WB |
468 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
469 | return false; | |
470 | ||
471 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
472 | * timestamp with egress dev. Not possible for packets without dev | |
473 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). | |
474 | */ | |
475 | if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || | |
829ae9d6 WB |
476 | (!skb->dev)) |
477 | return false; | |
478 | ||
c247f053 | 479 | info = PKTINFO_SKB_CB(skb); |
829ae9d6 WB |
480 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; |
481 | info->ipi_ifindex = skb->dev->ifindex; | |
482 | return true; | |
483 | } | |
484 | ||
e905a9ed | 485 | /* |
1da177e4 LT |
486 | * Handle MSG_ERRQUEUE |
487 | */ | |
85fbaa75 | 488 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
489 | { |
490 | struct sock_exterr_skb *serr; | |
364a9e93 | 491 | struct sk_buff *skb; |
342dfc30 | 492 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
493 | struct { |
494 | struct sock_extended_err ee; | |
495 | struct sockaddr_in offender; | |
496 | } errhdr; | |
497 | int err; | |
498 | int copied; | |
499 | ||
7ce875e5 WB |
500 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
501 | ||
1da177e4 | 502 | err = -EAGAIN; |
364a9e93 | 503 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 504 | if (!skb) |
1da177e4 LT |
505 | goto out; |
506 | ||
507 | copied = skb->len; | |
508 | if (copied > len) { | |
509 | msg->msg_flags |= MSG_TRUNC; | |
510 | copied = len; | |
511 | } | |
51f3d02b | 512 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
513 | if (unlikely(err)) { |
514 | kfree_skb(skb); | |
515 | return err; | |
516 | } | |
1da177e4 LT |
517 | sock_recv_timestamp(msg, sk, skb); |
518 | ||
519 | serr = SKB_EXT_ERR(skb); | |
520 | ||
34b99df4 | 521 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 522 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
523 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
524 | serr->addr_offset); | |
1da177e4 LT |
525 | sin->sin_port = serr->port; |
526 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 527 | *addr_len = sizeof(*sin); |
1da177e4 LT |
528 | } |
529 | ||
530 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
531 | sin = &errhdr.offender; | |
f812116b | 532 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 533 | |
c247f053 | 534 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 535 | sin->sin_family = AF_INET; |
eddc9ec5 | 536 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 537 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
538 | ip_cmsg_recv(msg, skb); |
539 | } | |
540 | ||
541 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
542 | ||
543 | /* Now we could try to dump offended packet options */ | |
544 | ||
545 | msg->msg_flags |= MSG_ERRQUEUE; | |
546 | err = copied; | |
547 | ||
960a2628 | 548 | consume_skb(skb); |
1da177e4 LT |
549 | out: |
550 | return err; | |
551 | } | |
552 | ||
553 | ||
554 | /* | |
4d52cfbe ED |
555 | * Socket option code for IP. This is the end of the line after any |
556 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 557 | */ |
baf606d9 MRL |
558 | static bool setsockopt_needs_rtnl(int optname) |
559 | { | |
560 | switch (optname) { | |
561 | case IP_ADD_MEMBERSHIP: | |
562 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 563 | case IP_BLOCK_SOURCE: |
baf606d9 | 564 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
565 | case IP_DROP_SOURCE_MEMBERSHIP: |
566 | case IP_MSFILTER: | |
567 | case IP_UNBLOCK_SOURCE: | |
568 | case MCAST_BLOCK_SOURCE: | |
569 | case MCAST_MSFILTER: | |
baf606d9 | 570 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 571 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 572 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
573 | case MCAST_LEAVE_SOURCE_GROUP: |
574 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
575 | return true; |
576 | } | |
577 | return false; | |
578 | } | |
1da177e4 | 579 | |
3fdadf7d | 580 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 581 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
582 | { |
583 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 584 | struct net *net = sock_net(sk); |
09cb105e | 585 | int val = 0, err; |
baf606d9 | 586 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 587 | |
0c9f79be XW |
588 | switch (optname) { |
589 | case IP_PKTINFO: | |
590 | case IP_RECVTTL: | |
591 | case IP_RECVOPTS: | |
592 | case IP_RECVTOS: | |
593 | case IP_RETOPTS: | |
594 | case IP_TOS: | |
595 | case IP_TTL: | |
596 | case IP_HDRINCL: | |
597 | case IP_MTU_DISCOVER: | |
598 | case IP_RECVERR: | |
599 | case IP_ROUTER_ALERT: | |
600 | case IP_FREEBIND: | |
601 | case IP_PASSSEC: | |
602 | case IP_TRANSPARENT: | |
603 | case IP_MINTTL: | |
604 | case IP_NODEFRAG: | |
90c337da | 605 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
606 | case IP_UNICAST_IF: |
607 | case IP_MULTICAST_TTL: | |
608 | case IP_MULTICAST_ALL: | |
609 | case IP_MULTICAST_LOOP: | |
610 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 611 | case IP_CHECKSUM: |
1da177e4 LT |
612 | if (optlen >= sizeof(int)) { |
613 | if (get_user(val, (int __user *) optval)) | |
614 | return -EFAULT; | |
615 | } else if (optlen >= sizeof(char)) { | |
616 | unsigned char ucval; | |
617 | ||
618 | if (get_user(ucval, (unsigned char __user *) optval)) | |
619 | return -EFAULT; | |
620 | val = (int) ucval; | |
621 | } | |
622 | } | |
623 | ||
624 | /* If optlen==0, it is equivalent to val == 0 */ | |
625 | ||
6a9fb947 | 626 | if (ip_mroute_opt(optname)) |
09cb105e | 627 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
628 | |
629 | err = 0; | |
baf606d9 MRL |
630 | if (needs_rtnl) |
631 | rtnl_lock(); | |
1da177e4 LT |
632 | lock_sock(sk); |
633 | ||
634 | switch (optname) { | |
132adf54 SH |
635 | case IP_OPTIONS: |
636 | { | |
f6d8bd05 ED |
637 | struct ip_options_rcu *old, *opt = NULL; |
638 | ||
65a1c4ff | 639 | if (optlen > 40) |
132adf54 | 640 | goto e_inval; |
3b1e0a65 | 641 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 642 | optval, optlen); |
132adf54 SH |
643 | if (err) |
644 | break; | |
f6d8bd05 | 645 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 646 | lockdep_sock_is_held(sk)); |
132adf54 SH |
647 | if (inet->is_icsk) { |
648 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 649 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
650 | if (sk->sk_family == PF_INET || |
651 | (!((1 << sk->sk_state) & | |
652 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 653 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 654 | #endif |
f6d8bd05 ED |
655 | if (old) |
656 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 657 | if (opt) |
f6d8bd05 | 658 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 659 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 660 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 661 | } |
132adf54 | 662 | #endif |
1da177e4 | 663 | } |
f6d8bd05 ED |
664 | rcu_assign_pointer(inet->inet_opt, opt); |
665 | if (old) | |
605b4afe | 666 | kfree_rcu(old, rcu); |
132adf54 SH |
667 | break; |
668 | } | |
669 | case IP_PKTINFO: | |
670 | if (val) | |
671 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
672 | else | |
673 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
674 | break; | |
675 | case IP_RECVTTL: | |
676 | if (val) | |
677 | inet->cmsg_flags |= IP_CMSG_TTL; | |
678 | else | |
679 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
680 | break; | |
681 | case IP_RECVTOS: | |
682 | if (val) | |
683 | inet->cmsg_flags |= IP_CMSG_TOS; | |
684 | else | |
685 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
686 | break; | |
687 | case IP_RECVOPTS: | |
688 | if (val) | |
689 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
690 | else | |
691 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
692 | break; | |
693 | case IP_RETOPTS: | |
694 | if (val) | |
695 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
696 | else | |
697 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
698 | break; | |
699 | case IP_PASSSEC: | |
700 | if (val) | |
701 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
702 | else | |
703 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
704 | break; | |
e8b2dfe9 BS |
705 | case IP_RECVORIGDSTADDR: |
706 | if (val) | |
707 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
708 | else | |
709 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
710 | break; | |
ad6f939a TH |
711 | case IP_CHECKSUM: |
712 | if (val) { | |
713 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
714 | inet_inc_convert_csum(sk); | |
715 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
716 | } | |
717 | } else { | |
718 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
719 | inet_dec_convert_csum(sk); | |
720 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
721 | } | |
722 | } | |
723 | break; | |
132adf54 SH |
724 | case IP_TOS: /* This sets both TOS and Precedence */ |
725 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
726 | val &= ~INET_ECN_MASK; |
727 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 728 | } |
132adf54 SH |
729 | if (inet->tos != val) { |
730 | inet->tos = val; | |
731 | sk->sk_priority = rt_tos2priority(val); | |
732 | sk_dst_reset(sk); | |
733 | } | |
734 | break; | |
735 | case IP_TTL: | |
4d52cfbe | 736 | if (optlen < 1) |
132adf54 | 737 | goto e_inval; |
c9be4a5c | 738 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
739 | goto e_inval; |
740 | inet->uc_ttl = val; | |
741 | break; | |
742 | case IP_HDRINCL: | |
743 | if (sk->sk_type != SOCK_RAW) { | |
744 | err = -ENOPROTOOPT; | |
2c7946a7 | 745 | break; |
132adf54 SH |
746 | } |
747 | inet->hdrincl = val ? 1 : 0; | |
748 | break; | |
7b2ff18e JO |
749 | case IP_NODEFRAG: |
750 | if (sk->sk_type != SOCK_RAW) { | |
751 | err = -ENOPROTOOPT; | |
752 | break; | |
753 | } | |
754 | inet->nodefrag = val ? 1 : 0; | |
755 | break; | |
90c337da ED |
756 | case IP_BIND_ADDRESS_NO_PORT: |
757 | inet->bind_address_no_port = val ? 1 : 0; | |
758 | break; | |
132adf54 | 759 | case IP_MTU_DISCOVER: |
1b346576 | 760 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
761 | goto e_inval; |
762 | inet->pmtudisc = val; | |
763 | break; | |
764 | case IP_RECVERR: | |
765 | inet->recverr = !!val; | |
766 | if (!val) | |
767 | skb_queue_purge(&sk->sk_error_queue); | |
768 | break; | |
769 | case IP_MULTICAST_TTL: | |
770 | if (sk->sk_type == SOCK_STREAM) | |
771 | goto e_inval; | |
4d52cfbe | 772 | if (optlen < 1) |
132adf54 | 773 | goto e_inval; |
09cb105e | 774 | if (val == -1) |
132adf54 SH |
775 | val = 1; |
776 | if (val < 0 || val > 255) | |
777 | goto e_inval; | |
778 | inet->mc_ttl = val; | |
779 | break; | |
780 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 781 | if (optlen < 1) |
132adf54 SH |
782 | goto e_inval; |
783 | inet->mc_loop = !!val; | |
784 | break; | |
76e21053 EH |
785 | case IP_UNICAST_IF: |
786 | { | |
787 | struct net_device *dev = NULL; | |
788 | int ifindex; | |
789 | ||
790 | if (optlen != sizeof(int)) | |
791 | goto e_inval; | |
792 | ||
793 | ifindex = (__force int)ntohl((__force __be32)val); | |
794 | if (ifindex == 0) { | |
795 | inet->uc_index = 0; | |
796 | err = 0; | |
797 | break; | |
798 | } | |
799 | ||
800 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
801 | err = -EADDRNOTAVAIL; | |
802 | if (!dev) | |
803 | break; | |
804 | dev_put(dev); | |
805 | ||
806 | err = -EINVAL; | |
807 | if (sk->sk_bound_dev_if) | |
808 | break; | |
809 | ||
810 | inet->uc_index = ifindex; | |
811 | err = 0; | |
812 | break; | |
813 | } | |
132adf54 SH |
814 | case IP_MULTICAST_IF: |
815 | { | |
816 | struct ip_mreqn mreq; | |
817 | struct net_device *dev = NULL; | |
818 | ||
819 | if (sk->sk_type == SOCK_STREAM) | |
820 | goto e_inval; | |
821 | /* | |
822 | * Check the arguments are allowable | |
823 | */ | |
824 | ||
0915921b SW |
825 | if (optlen < sizeof(struct in_addr)) |
826 | goto e_inval; | |
827 | ||
132adf54 SH |
828 | err = -EFAULT; |
829 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 830 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 831 | break; |
132adf54 SH |
832 | } else { |
833 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
834 | if (optlen >= sizeof(struct ip_mreq)) { |
835 | if (copy_from_user(&mreq, optval, | |
836 | sizeof(struct ip_mreq))) | |
837 | break; | |
838 | } else if (optlen >= sizeof(struct in_addr)) { | |
839 | if (copy_from_user(&mreq.imr_address, optval, | |
840 | sizeof(struct in_addr))) | |
841 | break; | |
842 | } | |
132adf54 SH |
843 | } |
844 | ||
845 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 846 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
847 | inet->mc_index = 0; |
848 | inet->mc_addr = 0; | |
849 | err = 0; | |
1da177e4 LT |
850 | break; |
851 | } | |
3b1e0a65 | 852 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 853 | if (dev) |
132adf54 | 854 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 855 | } else |
55b80503 | 856 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 857 | |
1da177e4 | 858 | |
132adf54 SH |
859 | err = -EADDRNOTAVAIL; |
860 | if (!dev) | |
861 | break; | |
55b80503 | 862 | dev_put(dev); |
132adf54 SH |
863 | |
864 | err = -EINVAL; | |
865 | if (sk->sk_bound_dev_if && | |
866 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
867 | break; | |
1da177e4 | 868 | |
132adf54 SH |
869 | inet->mc_index = mreq.imr_ifindex; |
870 | inet->mc_addr = mreq.imr_address.s_addr; | |
871 | err = 0; | |
872 | break; | |
873 | } | |
1da177e4 | 874 | |
132adf54 SH |
875 | case IP_ADD_MEMBERSHIP: |
876 | case IP_DROP_MEMBERSHIP: | |
877 | { | |
878 | struct ip_mreqn mreq; | |
1da177e4 | 879 | |
a96fb49b FL |
880 | err = -EPROTO; |
881 | if (inet_sk(sk)->is_icsk) | |
882 | break; | |
883 | ||
132adf54 SH |
884 | if (optlen < sizeof(struct ip_mreq)) |
885 | goto e_inval; | |
886 | err = -EFAULT; | |
887 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 888 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 889 | break; |
132adf54 SH |
890 | } else { |
891 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 892 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 893 | break; |
132adf54 | 894 | } |
1da177e4 | 895 | |
132adf54 | 896 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 897 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 898 | else |
54ff9ef3 | 899 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
900 | break; |
901 | } | |
902 | case IP_MSFILTER: | |
903 | { | |
132adf54 SH |
904 | struct ip_msfilter *msf; |
905 | ||
906 | if (optlen < IP_MSFILTER_SIZE(0)) | |
907 | goto e_inval; | |
908 | if (optlen > sysctl_optmem_max) { | |
909 | err = -ENOBUFS; | |
1da177e4 LT |
910 | break; |
911 | } | |
132adf54 | 912 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 913 | if (!msf) { |
132adf54 SH |
914 | err = -ENOBUFS; |
915 | break; | |
916 | } | |
917 | err = -EFAULT; | |
918 | if (copy_from_user(msf, optval, optlen)) { | |
919 | kfree(msf); | |
920 | break; | |
921 | } | |
922 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
923 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 924 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
925 | kfree(msf); |
926 | err = -ENOBUFS; | |
927 | break; | |
928 | } | |
929 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
930 | kfree(msf); | |
931 | err = -EINVAL; | |
932 | break; | |
933 | } | |
934 | err = ip_mc_msfilter(sk, msf, 0); | |
935 | kfree(msf); | |
936 | break; | |
937 | } | |
938 | case IP_BLOCK_SOURCE: | |
939 | case IP_UNBLOCK_SOURCE: | |
940 | case IP_ADD_SOURCE_MEMBERSHIP: | |
941 | case IP_DROP_SOURCE_MEMBERSHIP: | |
942 | { | |
943 | struct ip_mreq_source mreqs; | |
944 | int omode, add; | |
1da177e4 | 945 | |
132adf54 SH |
946 | if (optlen != sizeof(struct ip_mreq_source)) |
947 | goto e_inval; | |
948 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 949 | err = -EFAULT; |
1da177e4 LT |
950 | break; |
951 | } | |
132adf54 SH |
952 | if (optname == IP_BLOCK_SOURCE) { |
953 | omode = MCAST_EXCLUDE; | |
954 | add = 1; | |
955 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
956 | omode = MCAST_EXCLUDE; | |
957 | add = 0; | |
958 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
959 | struct ip_mreqn mreq; | |
1da177e4 | 960 | |
132adf54 SH |
961 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
962 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
963 | mreq.imr_ifindex = 0; | |
54ff9ef3 | 964 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 965 | if (err && err != -EADDRINUSE) |
1da177e4 | 966 | break; |
132adf54 SH |
967 | omode = MCAST_INCLUDE; |
968 | add = 1; | |
969 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
970 | omode = MCAST_INCLUDE; | |
971 | add = 0; | |
972 | } | |
973 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
974 | break; | |
975 | } | |
976 | case MCAST_JOIN_GROUP: | |
977 | case MCAST_LEAVE_GROUP: | |
978 | { | |
979 | struct group_req greq; | |
980 | struct sockaddr_in *psin; | |
981 | struct ip_mreqn mreq; | |
982 | ||
983 | if (optlen < sizeof(struct group_req)) | |
984 | goto e_inval; | |
985 | err = -EFAULT; | |
986 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
987 | break; | |
988 | psin = (struct sockaddr_in *)&greq.gr_group; | |
989 | if (psin->sin_family != AF_INET) | |
990 | goto e_inval; | |
991 | memset(&mreq, 0, sizeof(mreq)); | |
992 | mreq.imr_multiaddr = psin->sin_addr; | |
993 | mreq.imr_ifindex = greq.gr_interface; | |
994 | ||
995 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 996 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 997 | else |
54ff9ef3 | 998 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
999 | break; |
1000 | } | |
1001 | case MCAST_JOIN_SOURCE_GROUP: | |
1002 | case MCAST_LEAVE_SOURCE_GROUP: | |
1003 | case MCAST_BLOCK_SOURCE: | |
1004 | case MCAST_UNBLOCK_SOURCE: | |
1005 | { | |
1006 | struct group_source_req greqs; | |
1007 | struct ip_mreq_source mreqs; | |
1008 | struct sockaddr_in *psin; | |
1009 | int omode, add; | |
1010 | ||
1011 | if (optlen != sizeof(struct group_source_req)) | |
1012 | goto e_inval; | |
1013 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1014 | err = -EFAULT; |
1da177e4 LT |
1015 | break; |
1016 | } | |
132adf54 SH |
1017 | if (greqs.gsr_group.ss_family != AF_INET || |
1018 | greqs.gsr_source.ss_family != AF_INET) { | |
1019 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1020 | break; |
1021 | } | |
132adf54 SH |
1022 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1023 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1024 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1025 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1026 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1027 | ||
1028 | if (optname == MCAST_BLOCK_SOURCE) { | |
1029 | omode = MCAST_EXCLUDE; | |
1030 | add = 1; | |
1031 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1032 | omode = MCAST_EXCLUDE; | |
1033 | add = 0; | |
1034 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1035 | struct ip_mreqn mreq; |
1036 | ||
132adf54 | 1037 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1038 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1039 | mreq.imr_address.s_addr = 0; |
1040 | mreq.imr_ifindex = greqs.gsr_interface; | |
54ff9ef3 | 1041 | err = ip_mc_join_group(sk, &mreq); |
132adf54 SH |
1042 | if (err && err != -EADDRINUSE) |
1043 | break; | |
1044 | greqs.gsr_interface = mreq.imr_ifindex; | |
1045 | omode = MCAST_INCLUDE; | |
1046 | add = 1; | |
1047 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1048 | omode = MCAST_INCLUDE; | |
1049 | add = 0; | |
1050 | } | |
1051 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1052 | greqs.gsr_interface); | |
1053 | break; | |
1054 | } | |
1055 | case MCAST_MSFILTER: | |
1056 | { | |
132adf54 SH |
1057 | struct sockaddr_in *psin; |
1058 | struct ip_msfilter *msf = NULL; | |
1059 | struct group_filter *gsf = NULL; | |
1060 | int msize, i, ifindex; | |
1061 | ||
1062 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1063 | goto e_inval; | |
1064 | if (optlen > sysctl_optmem_max) { | |
1065 | err = -ENOBUFS; | |
1da177e4 LT |
1066 | break; |
1067 | } | |
09cb105e | 1068 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 1069 | if (!gsf) { |
132adf54 | 1070 | err = -ENOBUFS; |
1da177e4 LT |
1071 | break; |
1072 | } | |
132adf54 | 1073 | err = -EFAULT; |
4d52cfbe | 1074 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 1075 | goto mc_msf_out; |
4d52cfbe | 1076 | |
132adf54 SH |
1077 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1078 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1079 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1080 | err = -ENOBUFS; |
1081 | goto mc_msf_out; | |
1082 | } | |
1083 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1084 | err = -EINVAL; | |
1085 | goto mc_msf_out; | |
1086 | } | |
1087 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1088 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1089 | if (!msf) { |
132adf54 SH |
1090 | err = -ENOBUFS; |
1091 | goto mc_msf_out; | |
1092 | } | |
1093 | ifindex = gsf->gf_interface; | |
1094 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1095 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1096 | err = -EADDRNOTAVAIL; |
132adf54 | 1097 | goto mc_msf_out; |
1da177e4 | 1098 | } |
132adf54 SH |
1099 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1100 | msf->imsf_interface = 0; | |
1101 | msf->imsf_fmode = gsf->gf_fmode; | |
1102 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1103 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1104 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1105 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1106 | |
132adf54 SH |
1107 | if (psin->sin_family != AF_INET) |
1108 | goto mc_msf_out; | |
1109 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1110 | } | |
1111 | kfree(gsf); | |
1112 | gsf = NULL; | |
1113 | ||
1114 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1115 | mc_msf_out: |
132adf54 SH |
1116 | kfree(msf); |
1117 | kfree(gsf); | |
1118 | break; | |
1119 | } | |
f771bef9 NS |
1120 | case IP_MULTICAST_ALL: |
1121 | if (optlen < 1) | |
1122 | goto e_inval; | |
1123 | if (val != 0 && val != 1) | |
1124 | goto e_inval; | |
1125 | inet->mc_all = val; | |
1126 | break; | |
132adf54 SH |
1127 | case IP_ROUTER_ALERT: |
1128 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1129 | break; | |
1130 | ||
1131 | case IP_FREEBIND: | |
4d52cfbe | 1132 | if (optlen < 1) |
132adf54 SH |
1133 | goto e_inval; |
1134 | inet->freebind = !!val; | |
1135 | break; | |
1136 | ||
1137 | case IP_IPSEC_POLICY: | |
1138 | case IP_XFRM_POLICY: | |
1139 | err = -EPERM; | |
52e804c6 | 1140 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1141 | break; |
132adf54 SH |
1142 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1143 | break; | |
1da177e4 | 1144 | |
f5715aea | 1145 | case IP_TRANSPARENT: |
52e804c6 EB |
1146 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1147 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1148 | err = -EPERM; |
1149 | break; | |
1150 | } | |
1151 | if (optlen < 1) | |
1152 | goto e_inval; | |
1153 | inet->transparent = !!val; | |
1154 | break; | |
1155 | ||
d218d111 SH |
1156 | case IP_MINTTL: |
1157 | if (optlen < 1) | |
1158 | goto e_inval; | |
1159 | if (val < 0 || val > 255) | |
1160 | goto e_inval; | |
1161 | inet->min_ttl = val; | |
1162 | break; | |
1163 | ||
132adf54 SH |
1164 | default: |
1165 | err = -ENOPROTOOPT; | |
1166 | break; | |
1da177e4 LT |
1167 | } |
1168 | release_sock(sk); | |
baf606d9 MRL |
1169 | if (needs_rtnl) |
1170 | rtnl_unlock(); | |
1da177e4 LT |
1171 | return err; |
1172 | ||
1173 | e_inval: | |
1174 | release_sock(sk); | |
baf606d9 MRL |
1175 | if (needs_rtnl) |
1176 | rtnl_unlock(); | |
1da177e4 LT |
1177 | return -EINVAL; |
1178 | } | |
1179 | ||
f84af32c | 1180 | /** |
829ae9d6 | 1181 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1182 | * @sk: socket |
1183 | * @skb: buffer | |
1184 | * | |
35ebf65e DM |
1185 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1186 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1187 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1188 | */ |
fbf8866d | 1189 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1190 | { |
d826eb14 | 1191 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1192 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1193 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1194 | |
4b261c75 | 1195 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1196 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1197 | * which has interface index (iif) as the first member of the | |
1198 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1199 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
1200 | * element so the iif is picked up from the prior IPCB | |
1201 | */ | |
35ebf65e | 1202 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1203 | } else { |
1204 | pktinfo->ipi_ifindex = 0; | |
1205 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1206 | } | |
1207 | skb_dst_drop(skb); | |
f84af32c | 1208 | } |
f84af32c | 1209 | |
3fdadf7d | 1210 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1211 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1212 | { |
1213 | int err; | |
1214 | ||
1215 | if (level != SOL_IP) | |
1216 | return -ENOPROTOOPT; | |
1217 | ||
1218 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1219 | #ifdef CONFIG_NETFILTER | |
1220 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1221 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1222 | optname != IP_IPSEC_POLICY && |
1223 | optname != IP_XFRM_POLICY && | |
1224 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1225 | lock_sock(sk); |
1226 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1227 | release_sock(sk); | |
1228 | } | |
1229 | #endif | |
1230 | return err; | |
1231 | } | |
4d52cfbe | 1232 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1233 | |
1234 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1235 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1236 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1237 | { |
1238 | int err; | |
1239 | ||
1240 | if (level != SOL_IP) | |
1241 | return -ENOPROTOOPT; | |
1242 | ||
dae50295 DS |
1243 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1244 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1245 | ip_setsockopt); | |
1246 | ||
3fdadf7d DM |
1247 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1248 | #ifdef CONFIG_NETFILTER | |
1249 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1250 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1251 | optname != IP_IPSEC_POLICY && |
1252 | optname != IP_XFRM_POLICY && | |
1253 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1254 | lock_sock(sk); |
543d9cfe ACM |
1255 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1256 | optval, optlen); | |
3fdadf7d DM |
1257 | release_sock(sk); |
1258 | } | |
1259 | #endif | |
1260 | return err; | |
1261 | } | |
543d9cfe | 1262 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1263 | #endif |
1264 | ||
1da177e4 | 1265 | /* |
4d52cfbe ED |
1266 | * Get the options. Note for future reference. The GET of IP options gets |
1267 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1268 | */ |
1269 | ||
87e9f031 WC |
1270 | static bool getsockopt_needs_rtnl(int optname) |
1271 | { | |
1272 | switch (optname) { | |
1273 | case IP_MSFILTER: | |
1274 | case MCAST_MSFILTER: | |
1275 | return true; | |
1276 | } | |
1277 | return false; | |
1278 | } | |
1279 | ||
3fdadf7d | 1280 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1281 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1282 | { |
1283 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1284 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1285 | int val, err = 0; | |
1da177e4 | 1286 | int len; |
e905a9ed | 1287 | |
132adf54 | 1288 | if (level != SOL_IP) |
1da177e4 LT |
1289 | return -EOPNOTSUPP; |
1290 | ||
6a9fb947 | 1291 | if (ip_mroute_opt(optname)) |
09cb105e | 1292 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1293 | |
09cb105e | 1294 | if (get_user(len, optlen)) |
1da177e4 | 1295 | return -EFAULT; |
132adf54 | 1296 | if (len < 0) |
1da177e4 | 1297 | return -EINVAL; |
e905a9ed | 1298 | |
87e9f031 WC |
1299 | if (needs_rtnl) |
1300 | rtnl_lock(); | |
1da177e4 LT |
1301 | lock_sock(sk); |
1302 | ||
132adf54 SH |
1303 | switch (optname) { |
1304 | case IP_OPTIONS: | |
1305 | { | |
1306 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1307 | struct ip_options *opt = (struct ip_options *)optbuf; |
1308 | struct ip_options_rcu *inet_opt; | |
1309 | ||
1310 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1311 | lockdep_sock_is_held(sk)); |
132adf54 | 1312 | opt->optlen = 0; |
f6d8bd05 ED |
1313 | if (inet_opt) |
1314 | memcpy(optbuf, &inet_opt->opt, | |
1315 | sizeof(struct ip_options) + | |
1316 | inet_opt->opt.optlen); | |
132adf54 SH |
1317 | release_sock(sk); |
1318 | ||
1319 | if (opt->optlen == 0) | |
1320 | return put_user(0, optlen); | |
1321 | ||
1322 | ip_options_undo(opt); | |
1323 | ||
1324 | len = min_t(unsigned int, len, opt->optlen); | |
1325 | if (put_user(len, optlen)) | |
1326 | return -EFAULT; | |
1327 | if (copy_to_user(optval, opt->__data, len)) | |
1328 | return -EFAULT; | |
1329 | return 0; | |
1330 | } | |
1331 | case IP_PKTINFO: | |
1332 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1333 | break; | |
1334 | case IP_RECVTTL: | |
1335 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1336 | break; | |
1337 | case IP_RECVTOS: | |
1338 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1339 | break; | |
1340 | case IP_RECVOPTS: | |
1341 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1342 | break; | |
1343 | case IP_RETOPTS: | |
1344 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1345 | break; | |
1346 | case IP_PASSSEC: | |
1347 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1348 | break; | |
e8b2dfe9 BS |
1349 | case IP_RECVORIGDSTADDR: |
1350 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1351 | break; | |
ad6f939a TH |
1352 | case IP_CHECKSUM: |
1353 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1354 | break; | |
132adf54 SH |
1355 | case IP_TOS: |
1356 | val = inet->tos; | |
1357 | break; | |
1358 | case IP_TTL: | |
fa50d974 NB |
1359 | { |
1360 | struct net *net = sock_net(sk); | |
132adf54 | 1361 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1362 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1363 | inet->uc_ttl); |
1364 | break; | |
fa50d974 | 1365 | } |
132adf54 SH |
1366 | case IP_HDRINCL: |
1367 | val = inet->hdrincl; | |
1368 | break; | |
a89b4763 MK |
1369 | case IP_NODEFRAG: |
1370 | val = inet->nodefrag; | |
1371 | break; | |
90c337da ED |
1372 | case IP_BIND_ADDRESS_NO_PORT: |
1373 | val = inet->bind_address_no_port; | |
1374 | break; | |
132adf54 SH |
1375 | case IP_MTU_DISCOVER: |
1376 | val = inet->pmtudisc; | |
1377 | break; | |
1378 | case IP_MTU: | |
1379 | { | |
1380 | struct dst_entry *dst; | |
1381 | val = 0; | |
1382 | dst = sk_dst_get(sk); | |
1383 | if (dst) { | |
1384 | val = dst_mtu(dst); | |
1385 | dst_release(dst); | |
1da177e4 | 1386 | } |
132adf54 | 1387 | if (!val) { |
1da177e4 | 1388 | release_sock(sk); |
132adf54 | 1389 | return -ENOTCONN; |
1da177e4 | 1390 | } |
132adf54 SH |
1391 | break; |
1392 | } | |
1393 | case IP_RECVERR: | |
1394 | val = inet->recverr; | |
1395 | break; | |
1396 | case IP_MULTICAST_TTL: | |
1397 | val = inet->mc_ttl; | |
1398 | break; | |
1399 | case IP_MULTICAST_LOOP: | |
1400 | val = inet->mc_loop; | |
1401 | break; | |
76e21053 EH |
1402 | case IP_UNICAST_IF: |
1403 | val = (__force int)htonl((__u32) inet->uc_index); | |
1404 | break; | |
132adf54 SH |
1405 | case IP_MULTICAST_IF: |
1406 | { | |
1407 | struct in_addr addr; | |
1408 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1409 | addr.s_addr = inet->mc_addr; | |
1410 | release_sock(sk); | |
1da177e4 | 1411 | |
132adf54 SH |
1412 | if (put_user(len, optlen)) |
1413 | return -EFAULT; | |
1414 | if (copy_to_user(optval, &addr, len)) | |
1415 | return -EFAULT; | |
1416 | return 0; | |
1417 | } | |
1418 | case IP_MSFILTER: | |
1419 | { | |
1420 | struct ip_msfilter msf; | |
132adf54 SH |
1421 | |
1422 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1423 | err = -EINVAL; |
1424 | goto out; | |
1da177e4 | 1425 | } |
132adf54 | 1426 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1427 | err = -EFAULT; |
1428 | goto out; | |
1da177e4 | 1429 | } |
132adf54 SH |
1430 | err = ip_mc_msfget(sk, &msf, |
1431 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1432 | goto out; |
132adf54 SH |
1433 | } |
1434 | case MCAST_MSFILTER: | |
1435 | { | |
1436 | struct group_filter gsf; | |
1da177e4 | 1437 | |
132adf54 | 1438 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1439 | err = -EINVAL; |
1440 | goto out; | |
132adf54 SH |
1441 | } |
1442 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1443 | err = -EFAULT; |
1444 | goto out; | |
132adf54 SH |
1445 | } |
1446 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1447 | (struct group_filter __user *)optval, |
1448 | optlen); | |
87e9f031 | 1449 | goto out; |
132adf54 | 1450 | } |
f771bef9 NS |
1451 | case IP_MULTICAST_ALL: |
1452 | val = inet->mc_all; | |
1453 | break; | |
132adf54 SH |
1454 | case IP_PKTOPTIONS: |
1455 | { | |
1456 | struct msghdr msg; | |
1da177e4 | 1457 | |
132adf54 | 1458 | release_sock(sk); |
1da177e4 | 1459 | |
132adf54 SH |
1460 | if (sk->sk_type != SOCK_STREAM) |
1461 | return -ENOPROTOOPT; | |
1da177e4 | 1462 | |
c54a5e02 | 1463 | msg.msg_control = (__force void *) optval; |
132adf54 | 1464 | msg.msg_controllen = len; |
dd23198e | 1465 | msg.msg_flags = flags; |
1da177e4 | 1466 | |
132adf54 SH |
1467 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1468 | struct in_pktinfo info; | |
1469 | ||
c720c7e8 ED |
1470 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1471 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1472 | info.ipi_ifindex = inet->mc_index; |
1473 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1474 | } |
132adf54 SH |
1475 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1476 | int hlim = inet->mc_ttl; | |
1477 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1478 | } | |
4c507d28 JB |
1479 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1480 | int tos = inet->rcv_tos; | |
1481 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1482 | } | |
132adf54 SH |
1483 | len -= msg.msg_controllen; |
1484 | return put_user(len, optlen); | |
1485 | } | |
1486 | case IP_FREEBIND: | |
1487 | val = inet->freebind; | |
1488 | break; | |
f5715aea KK |
1489 | case IP_TRANSPARENT: |
1490 | val = inet->transparent; | |
1491 | break; | |
d218d111 SH |
1492 | case IP_MINTTL: |
1493 | val = inet->min_ttl; | |
1494 | break; | |
132adf54 SH |
1495 | default: |
1496 | release_sock(sk); | |
1497 | return -ENOPROTOOPT; | |
1da177e4 LT |
1498 | } |
1499 | release_sock(sk); | |
e905a9ed | 1500 | |
4d52cfbe | 1501 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1502 | unsigned char ucval = (unsigned char)val; |
1503 | len = 1; | |
132adf54 | 1504 | if (put_user(len, optlen)) |
1da177e4 | 1505 | return -EFAULT; |
09cb105e | 1506 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1507 | return -EFAULT; |
1508 | } else { | |
1509 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1510 | if (put_user(len, optlen)) |
1da177e4 | 1511 | return -EFAULT; |
09cb105e | 1512 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1513 | return -EFAULT; |
1514 | } | |
1515 | return 0; | |
87e9f031 WC |
1516 | |
1517 | out: | |
1518 | release_sock(sk); | |
1519 | if (needs_rtnl) | |
1520 | rtnl_unlock(); | |
1521 | return err; | |
1da177e4 LT |
1522 | } |
1523 | ||
3fdadf7d | 1524 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1525 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1526 | { |
1527 | int err; | |
1528 | ||
dd23198e | 1529 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1530 | #ifdef CONFIG_NETFILTER |
1531 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1532 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1533 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1534 | int len; |
3fdadf7d | 1535 | |
09cb105e | 1536 | if (get_user(len, optlen)) |
3fdadf7d DM |
1537 | return -EFAULT; |
1538 | ||
1539 | lock_sock(sk); | |
1540 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1541 | &len); | |
1542 | release_sock(sk); | |
1543 | if (err >= 0) | |
1544 | err = put_user(len, optlen); | |
1545 | return err; | |
1546 | } | |
1547 | #endif | |
1548 | return err; | |
1549 | } | |
4d52cfbe | 1550 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1551 | |
1552 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1553 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1554 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1555 | { |
42908c69 DS |
1556 | int err; |
1557 | ||
1558 | if (optname == MCAST_MSFILTER) | |
1559 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1560 | ip_getsockopt); | |
1561 | ||
dd23198e DB |
1562 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1563 | MSG_CMSG_COMPAT); | |
42908c69 | 1564 | |
3fdadf7d DM |
1565 | #ifdef CONFIG_NETFILTER |
1566 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1567 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1568 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1569 | int len; |
3fdadf7d | 1570 | |
543d9cfe | 1571 | if (get_user(len, optlen)) |
3fdadf7d DM |
1572 | return -EFAULT; |
1573 | ||
1574 | lock_sock(sk); | |
543d9cfe | 1575 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1576 | release_sock(sk); |
1577 | if (err >= 0) | |
1578 | err = put_user(len, optlen); | |
1579 | return err; | |
1580 | } | |
1581 | #endif | |
1582 | return err; | |
1583 | } | |
543d9cfe | 1584 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1585 | #endif |