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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 | ||
9402742c PA |
119 | if (offset != 0) { |
120 | int tend_off = skb_transport_offset(skb) + tlen; | |
121 | csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); | |
122 | } | |
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 | |
7fc2e3af | 491 | * timestamp with egress dev. Not possible for packets without iif |
c247f053 WB |
492 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). |
493 | */ | |
7fc2e3af WB |
494 | info = PKTINFO_SKB_CB(skb); |
495 | if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || | |
496 | !info->ipi_ifindex) | |
829ae9d6 WB |
497 | return false; |
498 | ||
499 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
829ae9d6 WB |
500 | return true; |
501 | } | |
502 | ||
e905a9ed | 503 | /* |
1da177e4 LT |
504 | * Handle MSG_ERRQUEUE |
505 | */ | |
85fbaa75 | 506 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
507 | { |
508 | struct sock_exterr_skb *serr; | |
364a9e93 | 509 | struct sk_buff *skb; |
342dfc30 | 510 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
511 | struct { |
512 | struct sock_extended_err ee; | |
513 | struct sockaddr_in offender; | |
514 | } errhdr; | |
515 | int err; | |
516 | int copied; | |
517 | ||
7ce875e5 WB |
518 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
519 | ||
1da177e4 | 520 | err = -EAGAIN; |
364a9e93 | 521 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 522 | if (!skb) |
1da177e4 LT |
523 | goto out; |
524 | ||
525 | copied = skb->len; | |
526 | if (copied > len) { | |
527 | msg->msg_flags |= MSG_TRUNC; | |
528 | copied = len; | |
529 | } | |
51f3d02b | 530 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
531 | if (unlikely(err)) { |
532 | kfree_skb(skb); | |
533 | return err; | |
534 | } | |
1da177e4 LT |
535 | sock_recv_timestamp(msg, sk, skb); |
536 | ||
537 | serr = SKB_EXT_ERR(skb); | |
538 | ||
34b99df4 | 539 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 540 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
541 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
542 | serr->addr_offset); | |
1da177e4 LT |
543 | sin->sin_port = serr->port; |
544 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 545 | *addr_len = sizeof(*sin); |
1da177e4 LT |
546 | } |
547 | ||
548 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
549 | sin = &errhdr.offender; | |
f812116b | 550 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 551 | |
c247f053 | 552 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 553 | sin->sin_family = AF_INET; |
eddc9ec5 | 554 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 555 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
556 | ip_cmsg_recv(msg, skb); |
557 | } | |
558 | ||
559 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
560 | ||
561 | /* Now we could try to dump offended packet options */ | |
562 | ||
563 | msg->msg_flags |= MSG_ERRQUEUE; | |
564 | err = copied; | |
565 | ||
960a2628 | 566 | consume_skb(skb); |
1da177e4 LT |
567 | out: |
568 | return err; | |
569 | } | |
570 | ||
571 | ||
572 | /* | |
4d52cfbe ED |
573 | * Socket option code for IP. This is the end of the line after any |
574 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 575 | */ |
baf606d9 MRL |
576 | static bool setsockopt_needs_rtnl(int optname) |
577 | { | |
578 | switch (optname) { | |
579 | case IP_ADD_MEMBERSHIP: | |
580 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 581 | case IP_BLOCK_SOURCE: |
baf606d9 | 582 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
583 | case IP_DROP_SOURCE_MEMBERSHIP: |
584 | case IP_MSFILTER: | |
585 | case IP_UNBLOCK_SOURCE: | |
586 | case MCAST_BLOCK_SOURCE: | |
587 | case MCAST_MSFILTER: | |
baf606d9 | 588 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 589 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 590 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
591 | case MCAST_LEAVE_SOURCE_GROUP: |
592 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
593 | return true; |
594 | } | |
595 | return false; | |
596 | } | |
1da177e4 | 597 | |
3fdadf7d | 598 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 599 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
600 | { |
601 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 602 | struct net *net = sock_net(sk); |
09cb105e | 603 | int val = 0, err; |
baf606d9 | 604 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 605 | |
0c9f79be XW |
606 | switch (optname) { |
607 | case IP_PKTINFO: | |
608 | case IP_RECVTTL: | |
609 | case IP_RECVOPTS: | |
610 | case IP_RECVTOS: | |
611 | case IP_RETOPTS: | |
612 | case IP_TOS: | |
613 | case IP_TTL: | |
614 | case IP_HDRINCL: | |
615 | case IP_MTU_DISCOVER: | |
616 | case IP_RECVERR: | |
617 | case IP_ROUTER_ALERT: | |
618 | case IP_FREEBIND: | |
619 | case IP_PASSSEC: | |
620 | case IP_TRANSPARENT: | |
621 | case IP_MINTTL: | |
622 | case IP_NODEFRAG: | |
90c337da | 623 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
624 | case IP_UNICAST_IF: |
625 | case IP_MULTICAST_TTL: | |
626 | case IP_MULTICAST_ALL: | |
627 | case IP_MULTICAST_LOOP: | |
628 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 629 | case IP_CHECKSUM: |
70ecc248 | 630 | case IP_RECVFRAGSIZE: |
1da177e4 LT |
631 | if (optlen >= sizeof(int)) { |
632 | if (get_user(val, (int __user *) optval)) | |
633 | return -EFAULT; | |
634 | } else if (optlen >= sizeof(char)) { | |
635 | unsigned char ucval; | |
636 | ||
637 | if (get_user(ucval, (unsigned char __user *) optval)) | |
638 | return -EFAULT; | |
639 | val = (int) ucval; | |
640 | } | |
641 | } | |
642 | ||
643 | /* If optlen==0, it is equivalent to val == 0 */ | |
644 | ||
6a9fb947 | 645 | if (ip_mroute_opt(optname)) |
09cb105e | 646 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
647 | |
648 | err = 0; | |
baf606d9 MRL |
649 | if (needs_rtnl) |
650 | rtnl_lock(); | |
1da177e4 LT |
651 | lock_sock(sk); |
652 | ||
653 | switch (optname) { | |
132adf54 SH |
654 | case IP_OPTIONS: |
655 | { | |
f6d8bd05 ED |
656 | struct ip_options_rcu *old, *opt = NULL; |
657 | ||
65a1c4ff | 658 | if (optlen > 40) |
132adf54 | 659 | goto e_inval; |
3b1e0a65 | 660 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 661 | optval, optlen); |
132adf54 SH |
662 | if (err) |
663 | break; | |
f6d8bd05 | 664 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 665 | lockdep_sock_is_held(sk)); |
132adf54 SH |
666 | if (inet->is_icsk) { |
667 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 668 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
669 | if (sk->sk_family == PF_INET || |
670 | (!((1 << sk->sk_state) & | |
671 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 672 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 673 | #endif |
f6d8bd05 ED |
674 | if (old) |
675 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 676 | if (opt) |
f6d8bd05 | 677 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 678 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 679 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 680 | } |
132adf54 | 681 | #endif |
1da177e4 | 682 | } |
f6d8bd05 ED |
683 | rcu_assign_pointer(inet->inet_opt, opt); |
684 | if (old) | |
605b4afe | 685 | kfree_rcu(old, rcu); |
132adf54 SH |
686 | break; |
687 | } | |
688 | case IP_PKTINFO: | |
689 | if (val) | |
690 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
691 | else | |
692 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
693 | break; | |
694 | case IP_RECVTTL: | |
695 | if (val) | |
696 | inet->cmsg_flags |= IP_CMSG_TTL; | |
697 | else | |
698 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
699 | break; | |
700 | case IP_RECVTOS: | |
701 | if (val) | |
702 | inet->cmsg_flags |= IP_CMSG_TOS; | |
703 | else | |
704 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
705 | break; | |
706 | case IP_RECVOPTS: | |
707 | if (val) | |
708 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
709 | else | |
710 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
711 | break; | |
712 | case IP_RETOPTS: | |
713 | if (val) | |
714 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
715 | else | |
716 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
717 | break; | |
718 | case IP_PASSSEC: | |
719 | if (val) | |
720 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
721 | else | |
722 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
723 | break; | |
e8b2dfe9 BS |
724 | case IP_RECVORIGDSTADDR: |
725 | if (val) | |
726 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
727 | else | |
728 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
729 | break; | |
ad6f939a TH |
730 | case IP_CHECKSUM: |
731 | if (val) { | |
732 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
733 | inet_inc_convert_csum(sk); | |
734 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
735 | } | |
736 | } else { | |
737 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
738 | inet_dec_convert_csum(sk); | |
739 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
740 | } | |
741 | } | |
742 | break; | |
70ecc248 WB |
743 | case IP_RECVFRAGSIZE: |
744 | if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) | |
745 | goto e_inval; | |
746 | if (val) | |
747 | inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; | |
748 | else | |
749 | inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; | |
750 | break; | |
132adf54 SH |
751 | case IP_TOS: /* This sets both TOS and Precedence */ |
752 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
753 | val &= ~INET_ECN_MASK; |
754 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 755 | } |
132adf54 SH |
756 | if (inet->tos != val) { |
757 | inet->tos = val; | |
758 | sk->sk_priority = rt_tos2priority(val); | |
759 | sk_dst_reset(sk); | |
760 | } | |
761 | break; | |
762 | case IP_TTL: | |
4d52cfbe | 763 | if (optlen < 1) |
132adf54 | 764 | goto e_inval; |
c9be4a5c | 765 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
766 | goto e_inval; |
767 | inet->uc_ttl = val; | |
768 | break; | |
769 | case IP_HDRINCL: | |
770 | if (sk->sk_type != SOCK_RAW) { | |
771 | err = -ENOPROTOOPT; | |
2c7946a7 | 772 | break; |
132adf54 SH |
773 | } |
774 | inet->hdrincl = val ? 1 : 0; | |
775 | break; | |
7b2ff18e JO |
776 | case IP_NODEFRAG: |
777 | if (sk->sk_type != SOCK_RAW) { | |
778 | err = -ENOPROTOOPT; | |
779 | break; | |
780 | } | |
781 | inet->nodefrag = val ? 1 : 0; | |
782 | break; | |
90c337da ED |
783 | case IP_BIND_ADDRESS_NO_PORT: |
784 | inet->bind_address_no_port = val ? 1 : 0; | |
785 | break; | |
132adf54 | 786 | case IP_MTU_DISCOVER: |
1b346576 | 787 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
788 | goto e_inval; |
789 | inet->pmtudisc = val; | |
790 | break; | |
791 | case IP_RECVERR: | |
792 | inet->recverr = !!val; | |
793 | if (!val) | |
794 | skb_queue_purge(&sk->sk_error_queue); | |
795 | break; | |
796 | case IP_MULTICAST_TTL: | |
797 | if (sk->sk_type == SOCK_STREAM) | |
798 | goto e_inval; | |
4d52cfbe | 799 | if (optlen < 1) |
132adf54 | 800 | goto e_inval; |
09cb105e | 801 | if (val == -1) |
132adf54 SH |
802 | val = 1; |
803 | if (val < 0 || val > 255) | |
804 | goto e_inval; | |
805 | inet->mc_ttl = val; | |
806 | break; | |
807 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 808 | if (optlen < 1) |
132adf54 SH |
809 | goto e_inval; |
810 | inet->mc_loop = !!val; | |
811 | break; | |
76e21053 EH |
812 | case IP_UNICAST_IF: |
813 | { | |
814 | struct net_device *dev = NULL; | |
815 | int ifindex; | |
816 | ||
817 | if (optlen != sizeof(int)) | |
818 | goto e_inval; | |
819 | ||
820 | ifindex = (__force int)ntohl((__force __be32)val); | |
821 | if (ifindex == 0) { | |
822 | inet->uc_index = 0; | |
823 | err = 0; | |
824 | break; | |
825 | } | |
826 | ||
827 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
828 | err = -EADDRNOTAVAIL; | |
829 | if (!dev) | |
830 | break; | |
831 | dev_put(dev); | |
832 | ||
833 | err = -EINVAL; | |
834 | if (sk->sk_bound_dev_if) | |
835 | break; | |
836 | ||
837 | inet->uc_index = ifindex; | |
838 | err = 0; | |
839 | break; | |
840 | } | |
132adf54 SH |
841 | case IP_MULTICAST_IF: |
842 | { | |
843 | struct ip_mreqn mreq; | |
844 | struct net_device *dev = NULL; | |
845 | ||
846 | if (sk->sk_type == SOCK_STREAM) | |
847 | goto e_inval; | |
848 | /* | |
849 | * Check the arguments are allowable | |
850 | */ | |
851 | ||
0915921b SW |
852 | if (optlen < sizeof(struct in_addr)) |
853 | goto e_inval; | |
854 | ||
132adf54 SH |
855 | err = -EFAULT; |
856 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 857 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 858 | break; |
132adf54 SH |
859 | } else { |
860 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
861 | if (optlen >= sizeof(struct ip_mreq)) { |
862 | if (copy_from_user(&mreq, optval, | |
863 | sizeof(struct ip_mreq))) | |
864 | break; | |
865 | } else if (optlen >= sizeof(struct in_addr)) { | |
866 | if (copy_from_user(&mreq.imr_address, optval, | |
867 | sizeof(struct in_addr))) | |
868 | break; | |
869 | } | |
132adf54 SH |
870 | } |
871 | ||
872 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 873 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
874 | inet->mc_index = 0; |
875 | inet->mc_addr = 0; | |
876 | err = 0; | |
1da177e4 LT |
877 | break; |
878 | } | |
3b1e0a65 | 879 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 880 | if (dev) |
132adf54 | 881 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 882 | } else |
55b80503 | 883 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 884 | |
1da177e4 | 885 | |
132adf54 SH |
886 | err = -EADDRNOTAVAIL; |
887 | if (!dev) | |
888 | break; | |
55b80503 | 889 | dev_put(dev); |
132adf54 SH |
890 | |
891 | err = -EINVAL; | |
892 | if (sk->sk_bound_dev_if && | |
893 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
894 | break; | |
1da177e4 | 895 | |
132adf54 SH |
896 | inet->mc_index = mreq.imr_ifindex; |
897 | inet->mc_addr = mreq.imr_address.s_addr; | |
898 | err = 0; | |
899 | break; | |
900 | } | |
1da177e4 | 901 | |
132adf54 SH |
902 | case IP_ADD_MEMBERSHIP: |
903 | case IP_DROP_MEMBERSHIP: | |
904 | { | |
905 | struct ip_mreqn mreq; | |
1da177e4 | 906 | |
a96fb49b FL |
907 | err = -EPROTO; |
908 | if (inet_sk(sk)->is_icsk) | |
909 | break; | |
910 | ||
132adf54 SH |
911 | if (optlen < sizeof(struct ip_mreq)) |
912 | goto e_inval; | |
913 | err = -EFAULT; | |
914 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 915 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 916 | break; |
132adf54 SH |
917 | } else { |
918 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 919 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 920 | break; |
132adf54 | 921 | } |
1da177e4 | 922 | |
132adf54 | 923 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 924 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 925 | else |
54ff9ef3 | 926 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
927 | break; |
928 | } | |
929 | case IP_MSFILTER: | |
930 | { | |
132adf54 SH |
931 | struct ip_msfilter *msf; |
932 | ||
933 | if (optlen < IP_MSFILTER_SIZE(0)) | |
934 | goto e_inval; | |
935 | if (optlen > sysctl_optmem_max) { | |
936 | err = -ENOBUFS; | |
1da177e4 LT |
937 | break; |
938 | } | |
132adf54 | 939 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 940 | if (!msf) { |
132adf54 SH |
941 | err = -ENOBUFS; |
942 | break; | |
943 | } | |
944 | err = -EFAULT; | |
945 | if (copy_from_user(msf, optval, optlen)) { | |
946 | kfree(msf); | |
947 | break; | |
948 | } | |
949 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
950 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 951 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
952 | kfree(msf); |
953 | err = -ENOBUFS; | |
954 | break; | |
955 | } | |
956 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
957 | kfree(msf); | |
958 | err = -EINVAL; | |
959 | break; | |
960 | } | |
961 | err = ip_mc_msfilter(sk, msf, 0); | |
962 | kfree(msf); | |
963 | break; | |
964 | } | |
965 | case IP_BLOCK_SOURCE: | |
966 | case IP_UNBLOCK_SOURCE: | |
967 | case IP_ADD_SOURCE_MEMBERSHIP: | |
968 | case IP_DROP_SOURCE_MEMBERSHIP: | |
969 | { | |
970 | struct ip_mreq_source mreqs; | |
971 | int omode, add; | |
1da177e4 | 972 | |
132adf54 SH |
973 | if (optlen != sizeof(struct ip_mreq_source)) |
974 | goto e_inval; | |
975 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 976 | err = -EFAULT; |
1da177e4 LT |
977 | break; |
978 | } | |
132adf54 SH |
979 | if (optname == IP_BLOCK_SOURCE) { |
980 | omode = MCAST_EXCLUDE; | |
981 | add = 1; | |
982 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
983 | omode = MCAST_EXCLUDE; | |
984 | add = 0; | |
985 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
986 | struct ip_mreqn mreq; | |
1da177e4 | 987 | |
132adf54 SH |
988 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
989 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
990 | mreq.imr_ifindex = 0; | |
54ff9ef3 | 991 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 992 | if (err && err != -EADDRINUSE) |
1da177e4 | 993 | break; |
132adf54 SH |
994 | omode = MCAST_INCLUDE; |
995 | add = 1; | |
996 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
997 | omode = MCAST_INCLUDE; | |
998 | add = 0; | |
999 | } | |
1000 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
1001 | break; | |
1002 | } | |
1003 | case MCAST_JOIN_GROUP: | |
1004 | case MCAST_LEAVE_GROUP: | |
1005 | { | |
1006 | struct group_req greq; | |
1007 | struct sockaddr_in *psin; | |
1008 | struct ip_mreqn mreq; | |
1009 | ||
1010 | if (optlen < sizeof(struct group_req)) | |
1011 | goto e_inval; | |
1012 | err = -EFAULT; | |
1013 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
1014 | break; | |
1015 | psin = (struct sockaddr_in *)&greq.gr_group; | |
1016 | if (psin->sin_family != AF_INET) | |
1017 | goto e_inval; | |
1018 | memset(&mreq, 0, sizeof(mreq)); | |
1019 | mreq.imr_multiaddr = psin->sin_addr; | |
1020 | mreq.imr_ifindex = greq.gr_interface; | |
1021 | ||
1022 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 1023 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1024 | else |
54ff9ef3 | 1025 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1026 | break; |
1027 | } | |
1028 | case MCAST_JOIN_SOURCE_GROUP: | |
1029 | case MCAST_LEAVE_SOURCE_GROUP: | |
1030 | case MCAST_BLOCK_SOURCE: | |
1031 | case MCAST_UNBLOCK_SOURCE: | |
1032 | { | |
1033 | struct group_source_req greqs; | |
1034 | struct ip_mreq_source mreqs; | |
1035 | struct sockaddr_in *psin; | |
1036 | int omode, add; | |
1037 | ||
1038 | if (optlen != sizeof(struct group_source_req)) | |
1039 | goto e_inval; | |
1040 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1041 | err = -EFAULT; |
1da177e4 LT |
1042 | break; |
1043 | } | |
132adf54 SH |
1044 | if (greqs.gsr_group.ss_family != AF_INET || |
1045 | greqs.gsr_source.ss_family != AF_INET) { | |
1046 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1047 | break; |
1048 | } | |
132adf54 SH |
1049 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1050 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1051 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1052 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1053 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1054 | ||
1055 | if (optname == MCAST_BLOCK_SOURCE) { | |
1056 | omode = MCAST_EXCLUDE; | |
1057 | add = 1; | |
1058 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1059 | omode = MCAST_EXCLUDE; | |
1060 | add = 0; | |
1061 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1062 | struct ip_mreqn mreq; |
1063 | ||
132adf54 | 1064 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1065 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1066 | mreq.imr_address.s_addr = 0; |
1067 | mreq.imr_ifindex = greqs.gsr_interface; | |
54ff9ef3 | 1068 | err = ip_mc_join_group(sk, &mreq); |
132adf54 SH |
1069 | if (err && err != -EADDRINUSE) |
1070 | break; | |
1071 | greqs.gsr_interface = mreq.imr_ifindex; | |
1072 | omode = MCAST_INCLUDE; | |
1073 | add = 1; | |
1074 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1075 | omode = MCAST_INCLUDE; | |
1076 | add = 0; | |
1077 | } | |
1078 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1079 | greqs.gsr_interface); | |
1080 | break; | |
1081 | } | |
1082 | case MCAST_MSFILTER: | |
1083 | { | |
132adf54 SH |
1084 | struct sockaddr_in *psin; |
1085 | struct ip_msfilter *msf = NULL; | |
1086 | struct group_filter *gsf = NULL; | |
1087 | int msize, i, ifindex; | |
1088 | ||
1089 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1090 | goto e_inval; | |
1091 | if (optlen > sysctl_optmem_max) { | |
1092 | err = -ENOBUFS; | |
1da177e4 LT |
1093 | break; |
1094 | } | |
09cb105e | 1095 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 1096 | if (!gsf) { |
132adf54 | 1097 | err = -ENOBUFS; |
1da177e4 LT |
1098 | break; |
1099 | } | |
132adf54 | 1100 | err = -EFAULT; |
4d52cfbe | 1101 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 1102 | goto mc_msf_out; |
4d52cfbe | 1103 | |
132adf54 SH |
1104 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1105 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1106 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1107 | err = -ENOBUFS; |
1108 | goto mc_msf_out; | |
1109 | } | |
1110 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1111 | err = -EINVAL; | |
1112 | goto mc_msf_out; | |
1113 | } | |
1114 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1115 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1116 | if (!msf) { |
132adf54 SH |
1117 | err = -ENOBUFS; |
1118 | goto mc_msf_out; | |
1119 | } | |
1120 | ifindex = gsf->gf_interface; | |
1121 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1122 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1123 | err = -EADDRNOTAVAIL; |
132adf54 | 1124 | goto mc_msf_out; |
1da177e4 | 1125 | } |
132adf54 SH |
1126 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1127 | msf->imsf_interface = 0; | |
1128 | msf->imsf_fmode = gsf->gf_fmode; | |
1129 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1130 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1131 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1132 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1133 | |
132adf54 SH |
1134 | if (psin->sin_family != AF_INET) |
1135 | goto mc_msf_out; | |
1136 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1137 | } | |
1138 | kfree(gsf); | |
1139 | gsf = NULL; | |
1140 | ||
1141 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1142 | mc_msf_out: |
132adf54 SH |
1143 | kfree(msf); |
1144 | kfree(gsf); | |
1145 | break; | |
1146 | } | |
f771bef9 NS |
1147 | case IP_MULTICAST_ALL: |
1148 | if (optlen < 1) | |
1149 | goto e_inval; | |
1150 | if (val != 0 && val != 1) | |
1151 | goto e_inval; | |
1152 | inet->mc_all = val; | |
1153 | break; | |
132adf54 SH |
1154 | case IP_ROUTER_ALERT: |
1155 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1156 | break; | |
1157 | ||
1158 | case IP_FREEBIND: | |
4d52cfbe | 1159 | if (optlen < 1) |
132adf54 SH |
1160 | goto e_inval; |
1161 | inet->freebind = !!val; | |
1162 | break; | |
1163 | ||
1164 | case IP_IPSEC_POLICY: | |
1165 | case IP_XFRM_POLICY: | |
1166 | err = -EPERM; | |
52e804c6 | 1167 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1168 | break; |
132adf54 SH |
1169 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1170 | break; | |
1da177e4 | 1171 | |
f5715aea | 1172 | case IP_TRANSPARENT: |
52e804c6 EB |
1173 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1174 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1175 | err = -EPERM; |
1176 | break; | |
1177 | } | |
1178 | if (optlen < 1) | |
1179 | goto e_inval; | |
1180 | inet->transparent = !!val; | |
1181 | break; | |
1182 | ||
d218d111 SH |
1183 | case IP_MINTTL: |
1184 | if (optlen < 1) | |
1185 | goto e_inval; | |
1186 | if (val < 0 || val > 255) | |
1187 | goto e_inval; | |
1188 | inet->min_ttl = val; | |
1189 | break; | |
1190 | ||
132adf54 SH |
1191 | default: |
1192 | err = -ENOPROTOOPT; | |
1193 | break; | |
1da177e4 LT |
1194 | } |
1195 | release_sock(sk); | |
baf606d9 MRL |
1196 | if (needs_rtnl) |
1197 | rtnl_unlock(); | |
1da177e4 LT |
1198 | return err; |
1199 | ||
1200 | e_inval: | |
1201 | release_sock(sk); | |
baf606d9 MRL |
1202 | if (needs_rtnl) |
1203 | rtnl_unlock(); | |
1da177e4 LT |
1204 | return -EINVAL; |
1205 | } | |
1206 | ||
f84af32c | 1207 | /** |
829ae9d6 | 1208 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1209 | * @sk: socket |
1210 | * @skb: buffer | |
1211 | * | |
35ebf65e DM |
1212 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1213 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1214 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1215 | */ |
fbf8866d | 1216 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1217 | { |
d826eb14 | 1218 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1219 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1220 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1221 | |
4b261c75 | 1222 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1223 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1224 | * which has interface index (iif) as the first member of the | |
1225 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1226 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
f0c16ba8 WZ |
1227 | * element so the iif is picked up from the prior IPCB. If iif |
1228 | * is the loopback interface, then return the sending interface | |
1229 | * (e.g., process binds socket to eth0 for Tx which is | |
1230 | * redirected to loopback in the rtable/dst). | |
0b922b7a | 1231 | */ |
f0c16ba8 WZ |
1232 | if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) |
1233 | pktinfo->ipi_ifindex = inet_iif(skb); | |
1234 | ||
35ebf65e | 1235 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1236 | } else { |
1237 | pktinfo->ipi_ifindex = 0; | |
1238 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1239 | } | |
34b2cef2 ED |
1240 | /* We need to keep the dst for __ip_options_echo() |
1241 | * We could restrict the test to opt.ts_needtime || opt.srr, | |
1242 | * but the following is good enough as IP options are not often used. | |
1243 | */ | |
1244 | if (unlikely(IPCB(skb)->opt.optlen)) | |
1245 | skb_dst_force(skb); | |
1246 | else | |
1247 | skb_dst_drop(skb); | |
f84af32c | 1248 | } |
f84af32c | 1249 | |
3fdadf7d | 1250 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1251 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1252 | { |
1253 | int err; | |
1254 | ||
1255 | if (level != SOL_IP) | |
1256 | return -ENOPROTOOPT; | |
1257 | ||
1258 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1259 | #ifdef CONFIG_NETFILTER | |
1260 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1261 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1262 | optname != IP_IPSEC_POLICY && |
1263 | optname != IP_XFRM_POLICY && | |
1264 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1265 | lock_sock(sk); |
1266 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1267 | release_sock(sk); | |
1268 | } | |
1269 | #endif | |
1270 | return err; | |
1271 | } | |
4d52cfbe | 1272 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1273 | |
1274 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1275 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1276 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1277 | { |
1278 | int err; | |
1279 | ||
1280 | if (level != SOL_IP) | |
1281 | return -ENOPROTOOPT; | |
1282 | ||
dae50295 DS |
1283 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1284 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1285 | ip_setsockopt); | |
1286 | ||
3fdadf7d DM |
1287 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1288 | #ifdef CONFIG_NETFILTER | |
1289 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1290 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1291 | optname != IP_IPSEC_POLICY && |
1292 | optname != IP_XFRM_POLICY && | |
1293 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1294 | lock_sock(sk); |
543d9cfe ACM |
1295 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1296 | optval, optlen); | |
3fdadf7d DM |
1297 | release_sock(sk); |
1298 | } | |
1299 | #endif | |
1300 | return err; | |
1301 | } | |
543d9cfe | 1302 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1303 | #endif |
1304 | ||
1da177e4 | 1305 | /* |
4d52cfbe ED |
1306 | * Get the options. Note for future reference. The GET of IP options gets |
1307 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1308 | */ |
1309 | ||
87e9f031 WC |
1310 | static bool getsockopt_needs_rtnl(int optname) |
1311 | { | |
1312 | switch (optname) { | |
1313 | case IP_MSFILTER: | |
1314 | case MCAST_MSFILTER: | |
1315 | return true; | |
1316 | } | |
1317 | return false; | |
1318 | } | |
1319 | ||
3fdadf7d | 1320 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1321 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1322 | { |
1323 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1324 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1325 | int val, err = 0; | |
1da177e4 | 1326 | int len; |
e905a9ed | 1327 | |
132adf54 | 1328 | if (level != SOL_IP) |
1da177e4 LT |
1329 | return -EOPNOTSUPP; |
1330 | ||
6a9fb947 | 1331 | if (ip_mroute_opt(optname)) |
09cb105e | 1332 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1333 | |
09cb105e | 1334 | if (get_user(len, optlen)) |
1da177e4 | 1335 | return -EFAULT; |
132adf54 | 1336 | if (len < 0) |
1da177e4 | 1337 | return -EINVAL; |
e905a9ed | 1338 | |
87e9f031 WC |
1339 | if (needs_rtnl) |
1340 | rtnl_lock(); | |
1da177e4 LT |
1341 | lock_sock(sk); |
1342 | ||
132adf54 SH |
1343 | switch (optname) { |
1344 | case IP_OPTIONS: | |
1345 | { | |
1346 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1347 | struct ip_options *opt = (struct ip_options *)optbuf; |
1348 | struct ip_options_rcu *inet_opt; | |
1349 | ||
1350 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1351 | lockdep_sock_is_held(sk)); |
132adf54 | 1352 | opt->optlen = 0; |
f6d8bd05 ED |
1353 | if (inet_opt) |
1354 | memcpy(optbuf, &inet_opt->opt, | |
1355 | sizeof(struct ip_options) + | |
1356 | inet_opt->opt.optlen); | |
132adf54 SH |
1357 | release_sock(sk); |
1358 | ||
1359 | if (opt->optlen == 0) | |
1360 | return put_user(0, optlen); | |
1361 | ||
1362 | ip_options_undo(opt); | |
1363 | ||
1364 | len = min_t(unsigned int, len, opt->optlen); | |
1365 | if (put_user(len, optlen)) | |
1366 | return -EFAULT; | |
1367 | if (copy_to_user(optval, opt->__data, len)) | |
1368 | return -EFAULT; | |
1369 | return 0; | |
1370 | } | |
1371 | case IP_PKTINFO: | |
1372 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1373 | break; | |
1374 | case IP_RECVTTL: | |
1375 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1376 | break; | |
1377 | case IP_RECVTOS: | |
1378 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1379 | break; | |
1380 | case IP_RECVOPTS: | |
1381 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1382 | break; | |
1383 | case IP_RETOPTS: | |
1384 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1385 | break; | |
1386 | case IP_PASSSEC: | |
1387 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1388 | break; | |
e8b2dfe9 BS |
1389 | case IP_RECVORIGDSTADDR: |
1390 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1391 | break; | |
ad6f939a TH |
1392 | case IP_CHECKSUM: |
1393 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1394 | break; | |
70ecc248 WB |
1395 | case IP_RECVFRAGSIZE: |
1396 | val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; | |
1397 | break; | |
132adf54 SH |
1398 | case IP_TOS: |
1399 | val = inet->tos; | |
1400 | break; | |
1401 | case IP_TTL: | |
fa50d974 NB |
1402 | { |
1403 | struct net *net = sock_net(sk); | |
132adf54 | 1404 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1405 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1406 | inet->uc_ttl); |
1407 | break; | |
fa50d974 | 1408 | } |
132adf54 SH |
1409 | case IP_HDRINCL: |
1410 | val = inet->hdrincl; | |
1411 | break; | |
a89b4763 MK |
1412 | case IP_NODEFRAG: |
1413 | val = inet->nodefrag; | |
1414 | break; | |
90c337da ED |
1415 | case IP_BIND_ADDRESS_NO_PORT: |
1416 | val = inet->bind_address_no_port; | |
1417 | break; | |
132adf54 SH |
1418 | case IP_MTU_DISCOVER: |
1419 | val = inet->pmtudisc; | |
1420 | break; | |
1421 | case IP_MTU: | |
1422 | { | |
1423 | struct dst_entry *dst; | |
1424 | val = 0; | |
1425 | dst = sk_dst_get(sk); | |
1426 | if (dst) { | |
1427 | val = dst_mtu(dst); | |
1428 | dst_release(dst); | |
1da177e4 | 1429 | } |
132adf54 | 1430 | if (!val) { |
1da177e4 | 1431 | release_sock(sk); |
132adf54 | 1432 | return -ENOTCONN; |
1da177e4 | 1433 | } |
132adf54 SH |
1434 | break; |
1435 | } | |
1436 | case IP_RECVERR: | |
1437 | val = inet->recverr; | |
1438 | break; | |
1439 | case IP_MULTICAST_TTL: | |
1440 | val = inet->mc_ttl; | |
1441 | break; | |
1442 | case IP_MULTICAST_LOOP: | |
1443 | val = inet->mc_loop; | |
1444 | break; | |
76e21053 EH |
1445 | case IP_UNICAST_IF: |
1446 | val = (__force int)htonl((__u32) inet->uc_index); | |
1447 | break; | |
132adf54 SH |
1448 | case IP_MULTICAST_IF: |
1449 | { | |
1450 | struct in_addr addr; | |
1451 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1452 | addr.s_addr = inet->mc_addr; | |
1453 | release_sock(sk); | |
1da177e4 | 1454 | |
132adf54 SH |
1455 | if (put_user(len, optlen)) |
1456 | return -EFAULT; | |
1457 | if (copy_to_user(optval, &addr, len)) | |
1458 | return -EFAULT; | |
1459 | return 0; | |
1460 | } | |
1461 | case IP_MSFILTER: | |
1462 | { | |
1463 | struct ip_msfilter msf; | |
132adf54 SH |
1464 | |
1465 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1466 | err = -EINVAL; |
1467 | goto out; | |
1da177e4 | 1468 | } |
132adf54 | 1469 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1470 | err = -EFAULT; |
1471 | goto out; | |
1da177e4 | 1472 | } |
132adf54 SH |
1473 | err = ip_mc_msfget(sk, &msf, |
1474 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1475 | goto out; |
132adf54 SH |
1476 | } |
1477 | case MCAST_MSFILTER: | |
1478 | { | |
1479 | struct group_filter gsf; | |
1da177e4 | 1480 | |
132adf54 | 1481 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1482 | err = -EINVAL; |
1483 | goto out; | |
132adf54 SH |
1484 | } |
1485 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1486 | err = -EFAULT; |
1487 | goto out; | |
132adf54 SH |
1488 | } |
1489 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1490 | (struct group_filter __user *)optval, |
1491 | optlen); | |
87e9f031 | 1492 | goto out; |
132adf54 | 1493 | } |
f771bef9 NS |
1494 | case IP_MULTICAST_ALL: |
1495 | val = inet->mc_all; | |
1496 | break; | |
132adf54 SH |
1497 | case IP_PKTOPTIONS: |
1498 | { | |
1499 | struct msghdr msg; | |
1da177e4 | 1500 | |
132adf54 | 1501 | release_sock(sk); |
1da177e4 | 1502 | |
132adf54 SH |
1503 | if (sk->sk_type != SOCK_STREAM) |
1504 | return -ENOPROTOOPT; | |
1da177e4 | 1505 | |
c54a5e02 | 1506 | msg.msg_control = (__force void *) optval; |
132adf54 | 1507 | msg.msg_controllen = len; |
dd23198e | 1508 | msg.msg_flags = flags; |
1da177e4 | 1509 | |
132adf54 SH |
1510 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1511 | struct in_pktinfo info; | |
1512 | ||
c720c7e8 ED |
1513 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1514 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1515 | info.ipi_ifindex = inet->mc_index; |
1516 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1517 | } |
132adf54 SH |
1518 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1519 | int hlim = inet->mc_ttl; | |
1520 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1521 | } | |
4c507d28 JB |
1522 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1523 | int tos = inet->rcv_tos; | |
1524 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1525 | } | |
132adf54 SH |
1526 | len -= msg.msg_controllen; |
1527 | return put_user(len, optlen); | |
1528 | } | |
1529 | case IP_FREEBIND: | |
1530 | val = inet->freebind; | |
1531 | break; | |
f5715aea KK |
1532 | case IP_TRANSPARENT: |
1533 | val = inet->transparent; | |
1534 | break; | |
d218d111 SH |
1535 | case IP_MINTTL: |
1536 | val = inet->min_ttl; | |
1537 | break; | |
132adf54 SH |
1538 | default: |
1539 | release_sock(sk); | |
1540 | return -ENOPROTOOPT; | |
1da177e4 LT |
1541 | } |
1542 | release_sock(sk); | |
e905a9ed | 1543 | |
4d52cfbe | 1544 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1545 | unsigned char ucval = (unsigned char)val; |
1546 | len = 1; | |
132adf54 | 1547 | if (put_user(len, optlen)) |
1da177e4 | 1548 | return -EFAULT; |
09cb105e | 1549 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1550 | return -EFAULT; |
1551 | } else { | |
1552 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1553 | if (put_user(len, optlen)) |
1da177e4 | 1554 | return -EFAULT; |
09cb105e | 1555 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1556 | return -EFAULT; |
1557 | } | |
1558 | return 0; | |
87e9f031 WC |
1559 | |
1560 | out: | |
1561 | release_sock(sk); | |
1562 | if (needs_rtnl) | |
1563 | rtnl_unlock(); | |
1564 | return err; | |
1da177e4 LT |
1565 | } |
1566 | ||
3fdadf7d | 1567 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1568 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1569 | { |
1570 | int err; | |
1571 | ||
dd23198e | 1572 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1573 | #ifdef CONFIG_NETFILTER |
1574 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1575 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1576 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1577 | int len; |
3fdadf7d | 1578 | |
09cb105e | 1579 | if (get_user(len, optlen)) |
3fdadf7d DM |
1580 | return -EFAULT; |
1581 | ||
1582 | lock_sock(sk); | |
1583 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1584 | &len); | |
1585 | release_sock(sk); | |
1586 | if (err >= 0) | |
1587 | err = put_user(len, optlen); | |
1588 | return err; | |
1589 | } | |
1590 | #endif | |
1591 | return err; | |
1592 | } | |
4d52cfbe | 1593 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1594 | |
1595 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1596 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1597 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1598 | { |
42908c69 DS |
1599 | int err; |
1600 | ||
1601 | if (optname == MCAST_MSFILTER) | |
1602 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1603 | ip_getsockopt); | |
1604 | ||
dd23198e DB |
1605 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1606 | MSG_CMSG_COMPAT); | |
42908c69 | 1607 | |
3fdadf7d DM |
1608 | #ifdef CONFIG_NETFILTER |
1609 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1610 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1611 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1612 | int len; |
3fdadf7d | 1613 | |
543d9cfe | 1614 | if (get_user(len, optlen)) |
3fdadf7d DM |
1615 | return -EFAULT; |
1616 | ||
1617 | lock_sock(sk); | |
543d9cfe | 1618 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1619 | release_sock(sk); |
1620 | if (err >= 0) | |
1621 | err = put_user(len, optlen); | |
1622 | return err; | |
1623 | } | |
1624 | #endif | |
1625 | return err; | |
1626 | } | |
543d9cfe | 1627 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1628 | #endif |