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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 LT |
25 | #include <linux/netdevice.h> |
26 | #include <net/sock.h> | |
27 | #include <net/ip.h> | |
28 | #include <net/icmp.h> | |
d83d8461 | 29 | #include <net/tcp_states.h> |
1da177e4 LT |
30 | #include <linux/udp.h> |
31 | #include <linux/igmp.h> | |
32 | #include <linux/netfilter.h> | |
33 | #include <linux/route.h> | |
34 | #include <linux/mroute.h> | |
35 | #include <net/route.h> | |
36 | #include <net/xfrm.h> | |
dae50295 | 37 | #include <net/compat.h> |
1da177e4 LT |
38 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
39 | #include <net/transp_v6.h> | |
40 | #endif | |
41 | ||
42 | #include <linux/errqueue.h> | |
43 | #include <asm/uaccess.h> | |
44 | ||
45 | #define IP_CMSG_PKTINFO 1 | |
46 | #define IP_CMSG_TTL 2 | |
47 | #define IP_CMSG_TOS 4 | |
48 | #define IP_CMSG_RECVOPTS 8 | |
49 | #define IP_CMSG_RETOPTS 16 | |
2c7946a7 | 50 | #define IP_CMSG_PASSSEC 32 |
e8b2dfe9 | 51 | #define IP_CMSG_ORIGDSTADDR 64 |
1da177e4 LT |
52 | |
53 | /* | |
54 | * SOL_IP control messages. | |
55 | */ | |
56 | ||
57 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
58 | { | |
59 | struct in_pktinfo info; | |
511c3f92 | 60 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 61 | |
eddc9ec5 | 62 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
63 | if (rt) { |
64 | info.ipi_ifindex = rt->rt_iif; | |
65 | info.ipi_spec_dst.s_addr = rt->rt_spec_dst; | |
66 | } else { | |
67 | info.ipi_ifindex = 0; | |
68 | info.ipi_spec_dst.s_addr = 0; | |
69 | } | |
70 | ||
71 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
72 | } | |
73 | ||
74 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
75 | { | |
eddc9ec5 | 76 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
77 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
78 | } | |
79 | ||
80 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
81 | { | |
eddc9ec5 | 82 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
83 | } |
84 | ||
85 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
86 | { | |
87 | if (IPCB(skb)->opt.optlen == 0) | |
88 | return; | |
89 | ||
eddc9ec5 ACM |
90 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
91 | ip_hdr(skb) + 1); | |
1da177e4 LT |
92 | } |
93 | ||
94 | ||
95 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
96 | { | |
97 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
09cb105e | 98 | struct ip_options * opt = (struct ip_options *)optbuf; |
1da177e4 LT |
99 | |
100 | if (IPCB(skb)->opt.optlen == 0) | |
101 | return; | |
102 | ||
103 | if (ip_options_echo(opt, skb)) { | |
104 | msg->msg_flags |= MSG_CTRUNC; | |
105 | return; | |
106 | } | |
107 | ip_options_undo(opt); | |
108 | ||
109 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
110 | } | |
111 | ||
2c7946a7 CZ |
112 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
113 | { | |
114 | char *secdata; | |
dc49c1f9 | 115 | u32 seclen, secid; |
2c7946a7 CZ |
116 | int err; |
117 | ||
dc49c1f9 CZ |
118 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
119 | if (err) | |
120 | return; | |
121 | ||
122 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
123 | if (err) |
124 | return; | |
125 | ||
126 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 127 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
128 | } |
129 | ||
21d1a161 | 130 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
131 | { |
132 | struct sockaddr_in sin; | |
133 | struct iphdr *iph = ip_hdr(skb); | |
21d1a161 | 134 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
135 | |
136 | if (skb_transport_offset(skb) + 4 > skb->len) | |
137 | return; | |
138 | ||
139 | /* All current transport protocols have the port numbers in the | |
140 | * first four bytes of the transport header and this function is | |
141 | * written with this assumption in mind. | |
142 | */ | |
143 | ||
144 | sin.sin_family = AF_INET; | |
145 | sin.sin_addr.s_addr = iph->daddr; | |
146 | sin.sin_port = ports[1]; | |
147 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
148 | ||
149 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
150 | } | |
1da177e4 LT |
151 | |
152 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) | |
153 | { | |
154 | struct inet_sock *inet = inet_sk(skb->sk); | |
155 | unsigned flags = inet->cmsg_flags; | |
156 | ||
157 | /* Ordered by supposed usage frequency */ | |
158 | if (flags & 1) | |
159 | ip_cmsg_recv_pktinfo(msg, skb); | |
4d52cfbe | 160 | if ((flags >>= 1) == 0) |
1da177e4 LT |
161 | return; |
162 | ||
163 | if (flags & 1) | |
164 | ip_cmsg_recv_ttl(msg, skb); | |
4d52cfbe | 165 | if ((flags >>= 1) == 0) |
1da177e4 LT |
166 | return; |
167 | ||
168 | if (flags & 1) | |
169 | ip_cmsg_recv_tos(msg, skb); | |
4d52cfbe | 170 | if ((flags >>= 1) == 0) |
1da177e4 LT |
171 | return; |
172 | ||
173 | if (flags & 1) | |
174 | ip_cmsg_recv_opts(msg, skb); | |
4d52cfbe | 175 | if ((flags >>= 1) == 0) |
1da177e4 LT |
176 | return; |
177 | ||
178 | if (flags & 1) | |
179 | ip_cmsg_recv_retopts(msg, skb); | |
4d52cfbe | 180 | if ((flags >>= 1) == 0) |
2c7946a7 CZ |
181 | return; |
182 | ||
183 | if (flags & 1) | |
184 | ip_cmsg_recv_security(msg, skb); | |
e8b2dfe9 | 185 | |
4d52cfbe | 186 | if ((flags >>= 1) == 0) |
e8b2dfe9 BS |
187 | return; |
188 | if (flags & 1) | |
189 | ip_cmsg_recv_dstaddr(msg, skb); | |
190 | ||
1da177e4 | 191 | } |
4d52cfbe | 192 | EXPORT_SYMBOL(ip_cmsg_recv); |
1da177e4 | 193 | |
7a6adb92 | 194 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
1da177e4 LT |
195 | { |
196 | int err; | |
197 | struct cmsghdr *cmsg; | |
198 | ||
199 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
200 | if (!CMSG_OK(msg, cmsg)) | |
201 | return -EINVAL; | |
202 | if (cmsg->cmsg_level != SOL_IP) | |
203 | continue; | |
204 | switch (cmsg->cmsg_type) { | |
205 | case IP_RETOPTS: | |
206 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4d52cfbe ED |
207 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
208 | err < 40 ? err : 40); | |
1da177e4 LT |
209 | if (err) |
210 | return err; | |
211 | break; | |
212 | case IP_PKTINFO: | |
213 | { | |
214 | struct in_pktinfo *info; | |
215 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
216 | return -EINVAL; | |
217 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
218 | ipc->oif = info->ipi_ifindex; | |
219 | ipc->addr = info->ipi_spec_dst.s_addr; | |
220 | break; | |
221 | } | |
222 | default: | |
223 | return -EINVAL; | |
224 | } | |
225 | } | |
226 | return 0; | |
227 | } | |
228 | ||
229 | ||
230 | /* Special input handler for packets caught by router alert option. | |
231 | They are selected only by protocol field, and then processed likely | |
232 | local ones; but only if someone wants them! Otherwise, router | |
233 | not running rsvpd will kill RSVP. | |
234 | ||
235 | It is user level problem, what it will make with them. | |
236 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
237 | but receiver should be enough clever f.e. to forward mtrace requests, | |
238 | sent to multicast group to reach destination designated router. | |
239 | */ | |
240 | struct ip_ra_chain *ip_ra_chain; | |
241 | DEFINE_RWLOCK(ip_ra_lock); | |
242 | ||
4d52cfbe ED |
243 | int ip_ra_control(struct sock *sk, unsigned char on, |
244 | void (*destructor)(struct sock *)) | |
1da177e4 LT |
245 | { |
246 | struct ip_ra_chain *ra, *new_ra, **rap; | |
247 | ||
c720c7e8 | 248 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
249 | return -EINVAL; |
250 | ||
251 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
252 | ||
253 | write_lock_bh(&ip_ra_lock); | |
4d52cfbe | 254 | for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) { |
1da177e4 LT |
255 | if (ra->sk == sk) { |
256 | if (on) { | |
257 | write_unlock_bh(&ip_ra_lock); | |
a51482bd | 258 | kfree(new_ra); |
1da177e4 LT |
259 | return -EADDRINUSE; |
260 | } | |
261 | *rap = ra->next; | |
262 | write_unlock_bh(&ip_ra_lock); | |
263 | ||
264 | if (ra->destructor) | |
265 | ra->destructor(sk); | |
266 | sock_put(sk); | |
267 | kfree(ra); | |
268 | return 0; | |
269 | } | |
270 | } | |
271 | if (new_ra == NULL) { | |
272 | write_unlock_bh(&ip_ra_lock); | |
273 | return -ENOBUFS; | |
274 | } | |
275 | new_ra->sk = sk; | |
276 | new_ra->destructor = destructor; | |
277 | ||
278 | new_ra->next = ra; | |
279 | *rap = new_ra; | |
280 | sock_hold(sk); | |
281 | write_unlock_bh(&ip_ra_lock); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
e905a9ed | 286 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 287 | __be16 port, u32 info, u8 *payload) |
1da177e4 LT |
288 | { |
289 | struct inet_sock *inet = inet_sk(sk); | |
290 | struct sock_exterr_skb *serr; | |
291 | ||
292 | if (!inet->recverr) | |
293 | return; | |
294 | ||
295 | skb = skb_clone(skb, GFP_ATOMIC); | |
296 | if (!skb) | |
297 | return; | |
298 | ||
e905a9ed | 299 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
300 | serr->ee.ee_errno = err; |
301 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
302 | serr->ee.ee_type = icmp_hdr(skb)->type; |
303 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
304 | serr->ee.ee_pad = 0; |
305 | serr->ee.ee_info = info; | |
306 | serr->ee.ee_data = 0; | |
88c7664f | 307 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 308 | skb_network_header(skb); |
1da177e4 LT |
309 | serr->port = port; |
310 | ||
bd82393c ACM |
311 | if (skb_pull(skb, payload - skb->data) != NULL) { |
312 | skb_reset_transport_header(skb); | |
313 | if (sock_queue_err_skb(sk, skb) == 0) | |
314 | return; | |
315 | } | |
316 | kfree_skb(skb); | |
1da177e4 LT |
317 | } |
318 | ||
0579016e | 319 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
320 | { |
321 | struct inet_sock *inet = inet_sk(sk); | |
322 | struct sock_exterr_skb *serr; | |
323 | struct iphdr *iph; | |
324 | struct sk_buff *skb; | |
325 | ||
326 | if (!inet->recverr) | |
327 | return; | |
328 | ||
329 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
330 | if (!skb) | |
331 | return; | |
332 | ||
2ca9e6f2 ACM |
333 | skb_put(skb, sizeof(struct iphdr)); |
334 | skb_reset_network_header(skb); | |
eddc9ec5 | 335 | iph = ip_hdr(skb); |
1da177e4 LT |
336 | iph->daddr = daddr; |
337 | ||
e905a9ed | 338 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
339 | serr->ee.ee_errno = err; |
340 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 341 | serr->ee.ee_type = 0; |
1da177e4 LT |
342 | serr->ee.ee_code = 0; |
343 | serr->ee.ee_pad = 0; | |
344 | serr->ee.ee_info = info; | |
345 | serr->ee.ee_data = 0; | |
d56f90a7 | 346 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
347 | serr->port = port; |
348 | ||
27a884dc | 349 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 350 | skb_reset_transport_header(skb); |
1da177e4 LT |
351 | |
352 | if (sock_queue_err_skb(sk, skb)) | |
353 | kfree_skb(skb); | |
354 | } | |
355 | ||
e905a9ed | 356 | /* |
1da177e4 LT |
357 | * Handle MSG_ERRQUEUE |
358 | */ | |
359 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
360 | { | |
361 | struct sock_exterr_skb *serr; | |
362 | struct sk_buff *skb, *skb2; | |
363 | struct sockaddr_in *sin; | |
364 | struct { | |
365 | struct sock_extended_err ee; | |
366 | struct sockaddr_in offender; | |
367 | } errhdr; | |
368 | int err; | |
369 | int copied; | |
370 | ||
371 | err = -EAGAIN; | |
372 | skb = skb_dequeue(&sk->sk_error_queue); | |
373 | if (skb == NULL) | |
374 | goto out; | |
375 | ||
376 | copied = skb->len; | |
377 | if (copied > len) { | |
378 | msg->msg_flags |= MSG_TRUNC; | |
379 | copied = len; | |
380 | } | |
381 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
382 | if (err) | |
383 | goto out_free_skb; | |
384 | ||
385 | sock_recv_timestamp(msg, sk, skb); | |
386 | ||
387 | serr = SKB_EXT_ERR(skb); | |
388 | ||
389 | sin = (struct sockaddr_in *)msg->msg_name; | |
390 | if (sin) { | |
391 | sin->sin_family = AF_INET; | |
d56f90a7 ACM |
392 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
393 | serr->addr_offset); | |
1da177e4 LT |
394 | sin->sin_port = serr->port; |
395 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
396 | } | |
397 | ||
398 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
399 | sin = &errhdr.offender; | |
400 | sin->sin_family = AF_UNSPEC; | |
401 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { | |
402 | struct inet_sock *inet = inet_sk(sk); | |
403 | ||
404 | sin->sin_family = AF_INET; | |
eddc9ec5 | 405 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
406 | sin->sin_port = 0; |
407 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
408 | if (inet->cmsg_flags) | |
409 | ip_cmsg_recv(msg, skb); | |
410 | } | |
411 | ||
412 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
413 | ||
414 | /* Now we could try to dump offended packet options */ | |
415 | ||
416 | msg->msg_flags |= MSG_ERRQUEUE; | |
417 | err = copied; | |
418 | ||
419 | /* Reset and regenerate socket error */ | |
e0f9f858 | 420 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 421 | sk->sk_err = 0; |
4d52cfbe ED |
422 | skb2 = skb_peek(&sk->sk_error_queue); |
423 | if (skb2 != NULL) { | |
1da177e4 | 424 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
e0f9f858 | 425 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
426 | sk->sk_error_report(sk); |
427 | } else | |
e0f9f858 | 428 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 429 | |
e905a9ed | 430 | out_free_skb: |
1da177e4 LT |
431 | kfree_skb(skb); |
432 | out: | |
433 | return err; | |
434 | } | |
435 | ||
436 | ||
437 | /* | |
4d52cfbe ED |
438 | * Socket option code for IP. This is the end of the line after any |
439 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
440 | */ |
441 | ||
3fdadf7d | 442 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 443 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
444 | { |
445 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 446 | int val = 0, err; |
1da177e4 | 447 | |
e905a9ed | 448 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
132adf54 SH |
449 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
450 | (1<<IP_RETOPTS) | (1<<IP_TOS) | | |
451 | (1<<IP_TTL) | (1<<IP_HDRINCL) | | |
452 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | | |
453 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | | |
f5715aea | 454 | (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) || |
132adf54 | 455 | optname == IP_MULTICAST_TTL || |
f771bef9 | 456 | optname == IP_MULTICAST_ALL || |
e8b2dfe9 BS |
457 | optname == IP_MULTICAST_LOOP || |
458 | optname == IP_RECVORIGDSTADDR) { | |
1da177e4 LT |
459 | if (optlen >= sizeof(int)) { |
460 | if (get_user(val, (int __user *) optval)) | |
461 | return -EFAULT; | |
462 | } else if (optlen >= sizeof(char)) { | |
463 | unsigned char ucval; | |
464 | ||
465 | if (get_user(ucval, (unsigned char __user *) optval)) | |
466 | return -EFAULT; | |
467 | val = (int) ucval; | |
468 | } | |
469 | } | |
470 | ||
471 | /* If optlen==0, it is equivalent to val == 0 */ | |
472 | ||
6a9fb947 | 473 | if (ip_mroute_opt(optname)) |
09cb105e | 474 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
475 | |
476 | err = 0; | |
477 | lock_sock(sk); | |
478 | ||
479 | switch (optname) { | |
132adf54 SH |
480 | case IP_OPTIONS: |
481 | { | |
4d52cfbe | 482 | struct ip_options *opt = NULL; |
132adf54 SH |
483 | if (optlen > 40 || optlen < 0) |
484 | goto e_inval; | |
3b1e0a65 | 485 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 486 | optval, optlen); |
132adf54 SH |
487 | if (err) |
488 | break; | |
489 | if (inet->is_icsk) { | |
490 | struct inet_connection_sock *icsk = inet_csk(sk); | |
1da177e4 | 491 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
132adf54 SH |
492 | if (sk->sk_family == PF_INET || |
493 | (!((1 << sk->sk_state) & | |
494 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 495 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 496 | #endif |
132adf54 SH |
497 | if (inet->opt) |
498 | icsk->icsk_ext_hdr_len -= inet->opt->optlen; | |
499 | if (opt) | |
500 | icsk->icsk_ext_hdr_len += opt->optlen; | |
501 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); | |
1da177e4 | 502 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 503 | } |
132adf54 | 504 | #endif |
1da177e4 | 505 | } |
132adf54 SH |
506 | opt = xchg(&inet->opt, opt); |
507 | kfree(opt); | |
508 | break; | |
509 | } | |
510 | case IP_PKTINFO: | |
511 | if (val) | |
512 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
513 | else | |
514 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
515 | break; | |
516 | case IP_RECVTTL: | |
517 | if (val) | |
518 | inet->cmsg_flags |= IP_CMSG_TTL; | |
519 | else | |
520 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
521 | break; | |
522 | case IP_RECVTOS: | |
523 | if (val) | |
524 | inet->cmsg_flags |= IP_CMSG_TOS; | |
525 | else | |
526 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
527 | break; | |
528 | case IP_RECVOPTS: | |
529 | if (val) | |
530 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
531 | else | |
532 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
533 | break; | |
534 | case IP_RETOPTS: | |
535 | if (val) | |
536 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
537 | else | |
538 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
539 | break; | |
540 | case IP_PASSSEC: | |
541 | if (val) | |
542 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
543 | else | |
544 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
545 | break; | |
e8b2dfe9 BS |
546 | case IP_RECVORIGDSTADDR: |
547 | if (val) | |
548 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
549 | else | |
550 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
551 | break; | |
132adf54 SH |
552 | case IP_TOS: /* This sets both TOS and Precedence */ |
553 | if (sk->sk_type == SOCK_STREAM) { | |
554 | val &= ~3; | |
555 | val |= inet->tos & 3; | |
556 | } | |
132adf54 SH |
557 | if (inet->tos != val) { |
558 | inet->tos = val; | |
559 | sk->sk_priority = rt_tos2priority(val); | |
560 | sk_dst_reset(sk); | |
561 | } | |
562 | break; | |
563 | case IP_TTL: | |
4d52cfbe | 564 | if (optlen < 1) |
132adf54 | 565 | goto e_inval; |
4d52cfbe | 566 | if (val != -1 && (val < 0 || val > 255)) |
132adf54 SH |
567 | goto e_inval; |
568 | inet->uc_ttl = val; | |
569 | break; | |
570 | case IP_HDRINCL: | |
571 | if (sk->sk_type != SOCK_RAW) { | |
572 | err = -ENOPROTOOPT; | |
2c7946a7 | 573 | break; |
132adf54 SH |
574 | } |
575 | inet->hdrincl = val ? 1 : 0; | |
576 | break; | |
577 | case IP_MTU_DISCOVER: | |
0eae750e | 578 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
132adf54 SH |
579 | goto e_inval; |
580 | inet->pmtudisc = val; | |
581 | break; | |
582 | case IP_RECVERR: | |
583 | inet->recverr = !!val; | |
584 | if (!val) | |
585 | skb_queue_purge(&sk->sk_error_queue); | |
586 | break; | |
587 | case IP_MULTICAST_TTL: | |
588 | if (sk->sk_type == SOCK_STREAM) | |
589 | goto e_inval; | |
4d52cfbe | 590 | if (optlen < 1) |
132adf54 | 591 | goto e_inval; |
09cb105e | 592 | if (val == -1) |
132adf54 SH |
593 | val = 1; |
594 | if (val < 0 || val > 255) | |
595 | goto e_inval; | |
596 | inet->mc_ttl = val; | |
597 | break; | |
598 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 599 | if (optlen < 1) |
132adf54 SH |
600 | goto e_inval; |
601 | inet->mc_loop = !!val; | |
602 | break; | |
603 | case IP_MULTICAST_IF: | |
604 | { | |
605 | struct ip_mreqn mreq; | |
606 | struct net_device *dev = NULL; | |
607 | ||
608 | if (sk->sk_type == SOCK_STREAM) | |
609 | goto e_inval; | |
610 | /* | |
611 | * Check the arguments are allowable | |
612 | */ | |
613 | ||
0915921b SW |
614 | if (optlen < sizeof(struct in_addr)) |
615 | goto e_inval; | |
616 | ||
132adf54 SH |
617 | err = -EFAULT; |
618 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 619 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 620 | break; |
132adf54 SH |
621 | } else { |
622 | memset(&mreq, 0, sizeof(mreq)); | |
623 | if (optlen >= sizeof(struct in_addr) && | |
4d52cfbe ED |
624 | copy_from_user(&mreq.imr_address, optval, |
625 | sizeof(struct in_addr))) | |
132adf54 SH |
626 | break; |
627 | } | |
628 | ||
629 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 630 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
631 | inet->mc_index = 0; |
632 | inet->mc_addr = 0; | |
633 | err = 0; | |
1da177e4 LT |
634 | break; |
635 | } | |
3b1e0a65 | 636 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 637 | if (dev) |
132adf54 | 638 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 639 | } else |
55b80503 | 640 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 641 | |
1da177e4 | 642 | |
132adf54 SH |
643 | err = -EADDRNOTAVAIL; |
644 | if (!dev) | |
645 | break; | |
55b80503 | 646 | dev_put(dev); |
132adf54 SH |
647 | |
648 | err = -EINVAL; | |
649 | if (sk->sk_bound_dev_if && | |
650 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
651 | break; | |
1da177e4 | 652 | |
132adf54 SH |
653 | inet->mc_index = mreq.imr_ifindex; |
654 | inet->mc_addr = mreq.imr_address.s_addr; | |
655 | err = 0; | |
656 | break; | |
657 | } | |
1da177e4 | 658 | |
132adf54 SH |
659 | case IP_ADD_MEMBERSHIP: |
660 | case IP_DROP_MEMBERSHIP: | |
661 | { | |
662 | struct ip_mreqn mreq; | |
1da177e4 | 663 | |
a96fb49b FL |
664 | err = -EPROTO; |
665 | if (inet_sk(sk)->is_icsk) | |
666 | break; | |
667 | ||
132adf54 SH |
668 | if (optlen < sizeof(struct ip_mreq)) |
669 | goto e_inval; | |
670 | err = -EFAULT; | |
671 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 672 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 673 | break; |
132adf54 SH |
674 | } else { |
675 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 676 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 677 | break; |
132adf54 | 678 | } |
1da177e4 | 679 | |
132adf54 SH |
680 | if (optname == IP_ADD_MEMBERSHIP) |
681 | err = ip_mc_join_group(sk, &mreq); | |
682 | else | |
683 | err = ip_mc_leave_group(sk, &mreq); | |
684 | break; | |
685 | } | |
686 | case IP_MSFILTER: | |
687 | { | |
132adf54 SH |
688 | struct ip_msfilter *msf; |
689 | ||
690 | if (optlen < IP_MSFILTER_SIZE(0)) | |
691 | goto e_inval; | |
692 | if (optlen > sysctl_optmem_max) { | |
693 | err = -ENOBUFS; | |
1da177e4 LT |
694 | break; |
695 | } | |
132adf54 | 696 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 697 | if (!msf) { |
132adf54 SH |
698 | err = -ENOBUFS; |
699 | break; | |
700 | } | |
701 | err = -EFAULT; | |
702 | if (copy_from_user(msf, optval, optlen)) { | |
703 | kfree(msf); | |
704 | break; | |
705 | } | |
706 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
707 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
708 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
709 | kfree(msf); | |
710 | err = -ENOBUFS; | |
711 | break; | |
712 | } | |
713 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
714 | kfree(msf); | |
715 | err = -EINVAL; | |
716 | break; | |
717 | } | |
718 | err = ip_mc_msfilter(sk, msf, 0); | |
719 | kfree(msf); | |
720 | break; | |
721 | } | |
722 | case IP_BLOCK_SOURCE: | |
723 | case IP_UNBLOCK_SOURCE: | |
724 | case IP_ADD_SOURCE_MEMBERSHIP: | |
725 | case IP_DROP_SOURCE_MEMBERSHIP: | |
726 | { | |
727 | struct ip_mreq_source mreqs; | |
728 | int omode, add; | |
1da177e4 | 729 | |
132adf54 SH |
730 | if (optlen != sizeof(struct ip_mreq_source)) |
731 | goto e_inval; | |
732 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 733 | err = -EFAULT; |
1da177e4 LT |
734 | break; |
735 | } | |
132adf54 SH |
736 | if (optname == IP_BLOCK_SOURCE) { |
737 | omode = MCAST_EXCLUDE; | |
738 | add = 1; | |
739 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
740 | omode = MCAST_EXCLUDE; | |
741 | add = 0; | |
742 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
743 | struct ip_mreqn mreq; | |
1da177e4 | 744 | |
132adf54 SH |
745 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
746 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
747 | mreq.imr_ifindex = 0; | |
748 | err = ip_mc_join_group(sk, &mreq); | |
749 | if (err && err != -EADDRINUSE) | |
1da177e4 | 750 | break; |
132adf54 SH |
751 | omode = MCAST_INCLUDE; |
752 | add = 1; | |
753 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
754 | omode = MCAST_INCLUDE; | |
755 | add = 0; | |
756 | } | |
757 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
758 | break; | |
759 | } | |
760 | case MCAST_JOIN_GROUP: | |
761 | case MCAST_LEAVE_GROUP: | |
762 | { | |
763 | struct group_req greq; | |
764 | struct sockaddr_in *psin; | |
765 | struct ip_mreqn mreq; | |
766 | ||
767 | if (optlen < sizeof(struct group_req)) | |
768 | goto e_inval; | |
769 | err = -EFAULT; | |
770 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
771 | break; | |
772 | psin = (struct sockaddr_in *)&greq.gr_group; | |
773 | if (psin->sin_family != AF_INET) | |
774 | goto e_inval; | |
775 | memset(&mreq, 0, sizeof(mreq)); | |
776 | mreq.imr_multiaddr = psin->sin_addr; | |
777 | mreq.imr_ifindex = greq.gr_interface; | |
778 | ||
779 | if (optname == MCAST_JOIN_GROUP) | |
780 | err = ip_mc_join_group(sk, &mreq); | |
781 | else | |
782 | err = ip_mc_leave_group(sk, &mreq); | |
783 | break; | |
784 | } | |
785 | case MCAST_JOIN_SOURCE_GROUP: | |
786 | case MCAST_LEAVE_SOURCE_GROUP: | |
787 | case MCAST_BLOCK_SOURCE: | |
788 | case MCAST_UNBLOCK_SOURCE: | |
789 | { | |
790 | struct group_source_req greqs; | |
791 | struct ip_mreq_source mreqs; | |
792 | struct sockaddr_in *psin; | |
793 | int omode, add; | |
794 | ||
795 | if (optlen != sizeof(struct group_source_req)) | |
796 | goto e_inval; | |
797 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 798 | err = -EFAULT; |
1da177e4 LT |
799 | break; |
800 | } | |
132adf54 SH |
801 | if (greqs.gsr_group.ss_family != AF_INET || |
802 | greqs.gsr_source.ss_family != AF_INET) { | |
803 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
804 | break; |
805 | } | |
132adf54 SH |
806 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
807 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
808 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
809 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
810 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
811 | ||
812 | if (optname == MCAST_BLOCK_SOURCE) { | |
813 | omode = MCAST_EXCLUDE; | |
814 | add = 1; | |
815 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
816 | omode = MCAST_EXCLUDE; | |
817 | add = 0; | |
818 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
819 | struct ip_mreqn mreq; |
820 | ||
132adf54 | 821 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 822 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
823 | mreq.imr_address.s_addr = 0; |
824 | mreq.imr_ifindex = greqs.gsr_interface; | |
825 | err = ip_mc_join_group(sk, &mreq); | |
826 | if (err && err != -EADDRINUSE) | |
827 | break; | |
828 | greqs.gsr_interface = mreq.imr_ifindex; | |
829 | omode = MCAST_INCLUDE; | |
830 | add = 1; | |
831 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
832 | omode = MCAST_INCLUDE; | |
833 | add = 0; | |
834 | } | |
835 | err = ip_mc_source(add, omode, sk, &mreqs, | |
836 | greqs.gsr_interface); | |
837 | break; | |
838 | } | |
839 | case MCAST_MSFILTER: | |
840 | { | |
132adf54 SH |
841 | struct sockaddr_in *psin; |
842 | struct ip_msfilter *msf = NULL; | |
843 | struct group_filter *gsf = NULL; | |
844 | int msize, i, ifindex; | |
845 | ||
846 | if (optlen < GROUP_FILTER_SIZE(0)) | |
847 | goto e_inval; | |
848 | if (optlen > sysctl_optmem_max) { | |
849 | err = -ENOBUFS; | |
1da177e4 LT |
850 | break; |
851 | } | |
09cb105e | 852 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 853 | if (!gsf) { |
132adf54 | 854 | err = -ENOBUFS; |
1da177e4 LT |
855 | break; |
856 | } | |
132adf54 | 857 | err = -EFAULT; |
4d52cfbe | 858 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 859 | goto mc_msf_out; |
4d52cfbe | 860 | |
132adf54 SH |
861 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
862 | if (gsf->gf_numsrc >= 0x1ffffff || | |
863 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
864 | err = -ENOBUFS; | |
865 | goto mc_msf_out; | |
866 | } | |
867 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
868 | err = -EINVAL; | |
869 | goto mc_msf_out; | |
870 | } | |
871 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 872 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 873 | if (!msf) { |
132adf54 SH |
874 | err = -ENOBUFS; |
875 | goto mc_msf_out; | |
876 | } | |
877 | ifindex = gsf->gf_interface; | |
878 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
879 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 880 | err = -EADDRNOTAVAIL; |
132adf54 | 881 | goto mc_msf_out; |
1da177e4 | 882 | } |
132adf54 SH |
883 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
884 | msf->imsf_interface = 0; | |
885 | msf->imsf_fmode = gsf->gf_fmode; | |
886 | msf->imsf_numsrc = gsf->gf_numsrc; | |
887 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 888 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 889 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 890 | |
132adf54 SH |
891 | if (psin->sin_family != AF_INET) |
892 | goto mc_msf_out; | |
893 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
894 | } | |
895 | kfree(gsf); | |
896 | gsf = NULL; | |
897 | ||
898 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 899 | mc_msf_out: |
132adf54 SH |
900 | kfree(msf); |
901 | kfree(gsf); | |
902 | break; | |
903 | } | |
f771bef9 NS |
904 | case IP_MULTICAST_ALL: |
905 | if (optlen < 1) | |
906 | goto e_inval; | |
907 | if (val != 0 && val != 1) | |
908 | goto e_inval; | |
909 | inet->mc_all = val; | |
910 | break; | |
132adf54 SH |
911 | case IP_ROUTER_ALERT: |
912 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
913 | break; | |
914 | ||
915 | case IP_FREEBIND: | |
4d52cfbe | 916 | if (optlen < 1) |
132adf54 SH |
917 | goto e_inval; |
918 | inet->freebind = !!val; | |
919 | break; | |
920 | ||
921 | case IP_IPSEC_POLICY: | |
922 | case IP_XFRM_POLICY: | |
923 | err = -EPERM; | |
924 | if (!capable(CAP_NET_ADMIN)) | |
1da177e4 | 925 | break; |
132adf54 SH |
926 | err = xfrm_user_policy(sk, optname, optval, optlen); |
927 | break; | |
1da177e4 | 928 | |
f5715aea KK |
929 | case IP_TRANSPARENT: |
930 | if (!capable(CAP_NET_ADMIN)) { | |
931 | err = -EPERM; | |
932 | break; | |
933 | } | |
934 | if (optlen < 1) | |
935 | goto e_inval; | |
936 | inet->transparent = !!val; | |
937 | break; | |
938 | ||
132adf54 SH |
939 | default: |
940 | err = -ENOPROTOOPT; | |
941 | break; | |
1da177e4 LT |
942 | } |
943 | release_sock(sk); | |
944 | return err; | |
945 | ||
946 | e_inval: | |
947 | release_sock(sk); | |
948 | return -EINVAL; | |
949 | } | |
950 | ||
3fdadf7d | 951 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 952 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
953 | { |
954 | int err; | |
955 | ||
956 | if (level != SOL_IP) | |
957 | return -ENOPROTOOPT; | |
958 | ||
959 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
960 | #ifdef CONFIG_NETFILTER | |
961 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
962 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
963 | optname != IP_IPSEC_POLICY && |
964 | optname != IP_XFRM_POLICY && | |
965 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
966 | lock_sock(sk); |
967 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
968 | release_sock(sk); | |
969 | } | |
970 | #endif | |
971 | return err; | |
972 | } | |
4d52cfbe | 973 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
974 | |
975 | #ifdef CONFIG_COMPAT | |
543d9cfe | 976 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 977 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
978 | { |
979 | int err; | |
980 | ||
981 | if (level != SOL_IP) | |
982 | return -ENOPROTOOPT; | |
983 | ||
dae50295 DS |
984 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
985 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
986 | ip_setsockopt); | |
987 | ||
3fdadf7d DM |
988 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
989 | #ifdef CONFIG_NETFILTER | |
990 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
991 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
992 | optname != IP_IPSEC_POLICY && |
993 | optname != IP_XFRM_POLICY && | |
994 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 995 | lock_sock(sk); |
543d9cfe ACM |
996 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
997 | optval, optlen); | |
3fdadf7d DM |
998 | release_sock(sk); |
999 | } | |
1000 | #endif | |
1001 | return err; | |
1002 | } | |
543d9cfe | 1003 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1004 | #endif |
1005 | ||
1da177e4 | 1006 | /* |
4d52cfbe ED |
1007 | * Get the options. Note for future reference. The GET of IP options gets |
1008 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1009 | */ |
1010 | ||
3fdadf7d | 1011 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
132adf54 | 1012 | char __user *optval, int __user *optlen) |
1da177e4 LT |
1013 | { |
1014 | struct inet_sock *inet = inet_sk(sk); | |
1015 | int val; | |
1016 | int len; | |
e905a9ed | 1017 | |
132adf54 | 1018 | if (level != SOL_IP) |
1da177e4 LT |
1019 | return -EOPNOTSUPP; |
1020 | ||
6a9fb947 | 1021 | if (ip_mroute_opt(optname)) |
09cb105e | 1022 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1023 | |
09cb105e | 1024 | if (get_user(len, optlen)) |
1da177e4 | 1025 | return -EFAULT; |
132adf54 | 1026 | if (len < 0) |
1da177e4 | 1027 | return -EINVAL; |
e905a9ed | 1028 | |
1da177e4 LT |
1029 | lock_sock(sk); |
1030 | ||
132adf54 SH |
1031 | switch (optname) { |
1032 | case IP_OPTIONS: | |
1033 | { | |
1034 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
09cb105e | 1035 | struct ip_options * opt = (struct ip_options *)optbuf; |
132adf54 SH |
1036 | opt->optlen = 0; |
1037 | if (inet->opt) | |
1038 | memcpy(optbuf, inet->opt, | |
1039 | sizeof(struct ip_options)+ | |
1040 | inet->opt->optlen); | |
1041 | release_sock(sk); | |
1042 | ||
1043 | if (opt->optlen == 0) | |
1044 | return put_user(0, optlen); | |
1045 | ||
1046 | ip_options_undo(opt); | |
1047 | ||
1048 | len = min_t(unsigned int, len, opt->optlen); | |
1049 | if (put_user(len, optlen)) | |
1050 | return -EFAULT; | |
1051 | if (copy_to_user(optval, opt->__data, len)) | |
1052 | return -EFAULT; | |
1053 | return 0; | |
1054 | } | |
1055 | case IP_PKTINFO: | |
1056 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1057 | break; | |
1058 | case IP_RECVTTL: | |
1059 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1060 | break; | |
1061 | case IP_RECVTOS: | |
1062 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1063 | break; | |
1064 | case IP_RECVOPTS: | |
1065 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1066 | break; | |
1067 | case IP_RETOPTS: | |
1068 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1069 | break; | |
1070 | case IP_PASSSEC: | |
1071 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1072 | break; | |
e8b2dfe9 BS |
1073 | case IP_RECVORIGDSTADDR: |
1074 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1075 | break; | |
132adf54 SH |
1076 | case IP_TOS: |
1077 | val = inet->tos; | |
1078 | break; | |
1079 | case IP_TTL: | |
1080 | val = (inet->uc_ttl == -1 ? | |
1081 | sysctl_ip_default_ttl : | |
1082 | inet->uc_ttl); | |
1083 | break; | |
1084 | case IP_HDRINCL: | |
1085 | val = inet->hdrincl; | |
1086 | break; | |
1087 | case IP_MTU_DISCOVER: | |
1088 | val = inet->pmtudisc; | |
1089 | break; | |
1090 | case IP_MTU: | |
1091 | { | |
1092 | struct dst_entry *dst; | |
1093 | val = 0; | |
1094 | dst = sk_dst_get(sk); | |
1095 | if (dst) { | |
1096 | val = dst_mtu(dst); | |
1097 | dst_release(dst); | |
1da177e4 | 1098 | } |
132adf54 | 1099 | if (!val) { |
1da177e4 | 1100 | release_sock(sk); |
132adf54 | 1101 | return -ENOTCONN; |
1da177e4 | 1102 | } |
132adf54 SH |
1103 | break; |
1104 | } | |
1105 | case IP_RECVERR: | |
1106 | val = inet->recverr; | |
1107 | break; | |
1108 | case IP_MULTICAST_TTL: | |
1109 | val = inet->mc_ttl; | |
1110 | break; | |
1111 | case IP_MULTICAST_LOOP: | |
1112 | val = inet->mc_loop; | |
1113 | break; | |
1114 | case IP_MULTICAST_IF: | |
1115 | { | |
1116 | struct in_addr addr; | |
1117 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1118 | addr.s_addr = inet->mc_addr; | |
1119 | release_sock(sk); | |
1da177e4 | 1120 | |
132adf54 SH |
1121 | if (put_user(len, optlen)) |
1122 | return -EFAULT; | |
1123 | if (copy_to_user(optval, &addr, len)) | |
1124 | return -EFAULT; | |
1125 | return 0; | |
1126 | } | |
1127 | case IP_MSFILTER: | |
1128 | { | |
1129 | struct ip_msfilter msf; | |
1130 | int err; | |
1131 | ||
1132 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1133 | release_sock(sk); |
132adf54 | 1134 | return -EINVAL; |
1da177e4 | 1135 | } |
132adf54 | 1136 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1137 | release_sock(sk); |
132adf54 | 1138 | return -EFAULT; |
1da177e4 | 1139 | } |
132adf54 SH |
1140 | err = ip_mc_msfget(sk, &msf, |
1141 | (struct ip_msfilter __user *)optval, optlen); | |
1142 | release_sock(sk); | |
1143 | return err; | |
1144 | } | |
1145 | case MCAST_MSFILTER: | |
1146 | { | |
1147 | struct group_filter gsf; | |
1148 | int err; | |
1da177e4 | 1149 | |
132adf54 | 1150 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1151 | release_sock(sk); |
132adf54 SH |
1152 | return -EINVAL; |
1153 | } | |
1154 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1155 | release_sock(sk); | |
1156 | return -EFAULT; | |
1157 | } | |
1158 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1159 | (struct group_filter __user *)optval, |
1160 | optlen); | |
132adf54 SH |
1161 | release_sock(sk); |
1162 | return err; | |
1163 | } | |
f771bef9 NS |
1164 | case IP_MULTICAST_ALL: |
1165 | val = inet->mc_all; | |
1166 | break; | |
132adf54 SH |
1167 | case IP_PKTOPTIONS: |
1168 | { | |
1169 | struct msghdr msg; | |
1da177e4 | 1170 | |
132adf54 | 1171 | release_sock(sk); |
1da177e4 | 1172 | |
132adf54 SH |
1173 | if (sk->sk_type != SOCK_STREAM) |
1174 | return -ENOPROTOOPT; | |
1da177e4 | 1175 | |
132adf54 SH |
1176 | msg.msg_control = optval; |
1177 | msg.msg_controllen = len; | |
1178 | msg.msg_flags = 0; | |
1da177e4 | 1179 | |
132adf54 SH |
1180 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1181 | struct in_pktinfo info; | |
1182 | ||
c720c7e8 ED |
1183 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1184 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1185 | info.ipi_ifindex = inet->mc_index; |
1186 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1187 | } |
132adf54 SH |
1188 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1189 | int hlim = inet->mc_ttl; | |
1190 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1191 | } | |
1192 | len -= msg.msg_controllen; | |
1193 | return put_user(len, optlen); | |
1194 | } | |
1195 | case IP_FREEBIND: | |
1196 | val = inet->freebind; | |
1197 | break; | |
f5715aea KK |
1198 | case IP_TRANSPARENT: |
1199 | val = inet->transparent; | |
1200 | break; | |
132adf54 SH |
1201 | default: |
1202 | release_sock(sk); | |
1203 | return -ENOPROTOOPT; | |
1da177e4 LT |
1204 | } |
1205 | release_sock(sk); | |
e905a9ed | 1206 | |
4d52cfbe | 1207 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1208 | unsigned char ucval = (unsigned char)val; |
1209 | len = 1; | |
132adf54 | 1210 | if (put_user(len, optlen)) |
1da177e4 | 1211 | return -EFAULT; |
09cb105e | 1212 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1213 | return -EFAULT; |
1214 | } else { | |
1215 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1216 | if (put_user(len, optlen)) |
1da177e4 | 1217 | return -EFAULT; |
09cb105e | 1218 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1219 | return -EFAULT; |
1220 | } | |
1221 | return 0; | |
1222 | } | |
1223 | ||
3fdadf7d | 1224 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1225 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1226 | { |
1227 | int err; | |
1228 | ||
1229 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); | |
1230 | #ifdef CONFIG_NETFILTER | |
1231 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1232 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1233 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1234 | int len; |
3fdadf7d | 1235 | |
09cb105e | 1236 | if (get_user(len, optlen)) |
3fdadf7d DM |
1237 | return -EFAULT; |
1238 | ||
1239 | lock_sock(sk); | |
1240 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1241 | &len); | |
1242 | release_sock(sk); | |
1243 | if (err >= 0) | |
1244 | err = put_user(len, optlen); | |
1245 | return err; | |
1246 | } | |
1247 | #endif | |
1248 | return err; | |
1249 | } | |
4d52cfbe | 1250 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1251 | |
1252 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1253 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1254 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1255 | { |
42908c69 DS |
1256 | int err; |
1257 | ||
1258 | if (optname == MCAST_MSFILTER) | |
1259 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1260 | ip_getsockopt); | |
1261 | ||
1262 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); | |
1263 | ||
3fdadf7d DM |
1264 | #ifdef CONFIG_NETFILTER |
1265 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1266 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1267 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1268 | int len; |
3fdadf7d | 1269 | |
543d9cfe | 1270 | if (get_user(len, optlen)) |
3fdadf7d DM |
1271 | return -EFAULT; |
1272 | ||
1273 | lock_sock(sk); | |
543d9cfe | 1274 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1275 | release_sock(sk); |
1276 | if (err >= 0) | |
1277 | err = put_user(len, optlen); | |
1278 | return err; | |
1279 | } | |
1280 | #endif | |
1281 | return err; | |
1282 | } | |
543d9cfe | 1283 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1284 | #endif |