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> | |
36 | #include <net/route.h> | |
37 | #include <net/xfrm.h> | |
dae50295 | 38 | #include <net/compat.h> |
1da177e4 LT |
39 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
40 | #include <net/transp_v6.h> | |
41 | #endif | |
42 | ||
43 | #include <linux/errqueue.h> | |
44 | #include <asm/uaccess.h> | |
45 | ||
46 | #define IP_CMSG_PKTINFO 1 | |
47 | #define IP_CMSG_TTL 2 | |
48 | #define IP_CMSG_TOS 4 | |
49 | #define IP_CMSG_RECVOPTS 8 | |
50 | #define IP_CMSG_RETOPTS 16 | |
2c7946a7 | 51 | #define IP_CMSG_PASSSEC 32 |
e8b2dfe9 | 52 | #define IP_CMSG_ORIGDSTADDR 64 |
1da177e4 LT |
53 | |
54 | /* | |
55 | * SOL_IP control messages. | |
56 | */ | |
57 | ||
58 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
59 | { | |
60 | struct in_pktinfo info; | |
511c3f92 | 61 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 62 | |
eddc9ec5 | 63 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
64 | if (rt) { |
65 | info.ipi_ifindex = rt->rt_iif; | |
66 | info.ipi_spec_dst.s_addr = rt->rt_spec_dst; | |
67 | } else { | |
68 | info.ipi_ifindex = 0; | |
69 | info.ipi_spec_dst.s_addr = 0; | |
70 | } | |
71 | ||
72 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
73 | } | |
74 | ||
75 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
76 | { | |
eddc9ec5 | 77 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
78 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
79 | } | |
80 | ||
81 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
82 | { | |
eddc9ec5 | 83 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
84 | } |
85 | ||
86 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
87 | { | |
88 | if (IPCB(skb)->opt.optlen == 0) | |
89 | return; | |
90 | ||
eddc9ec5 ACM |
91 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
92 | ip_hdr(skb) + 1); | |
1da177e4 LT |
93 | } |
94 | ||
95 | ||
96 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
97 | { | |
98 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
09cb105e | 99 | struct ip_options * opt = (struct ip_options *)optbuf; |
1da177e4 LT |
100 | |
101 | if (IPCB(skb)->opt.optlen == 0) | |
102 | return; | |
103 | ||
104 | if (ip_options_echo(opt, skb)) { | |
105 | msg->msg_flags |= MSG_CTRUNC; | |
106 | return; | |
107 | } | |
108 | ip_options_undo(opt); | |
109 | ||
110 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
111 | } | |
112 | ||
2c7946a7 CZ |
113 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
114 | { | |
115 | char *secdata; | |
dc49c1f9 | 116 | u32 seclen, secid; |
2c7946a7 CZ |
117 | int err; |
118 | ||
dc49c1f9 CZ |
119 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
120 | if (err) | |
121 | return; | |
122 | ||
123 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
124 | if (err) |
125 | return; | |
126 | ||
127 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 128 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
129 | } |
130 | ||
21d1a161 | 131 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
132 | { |
133 | struct sockaddr_in sin; | |
134 | struct iphdr *iph = ip_hdr(skb); | |
21d1a161 | 135 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
136 | |
137 | if (skb_transport_offset(skb) + 4 > skb->len) | |
138 | return; | |
139 | ||
140 | /* All current transport protocols have the port numbers in the | |
141 | * first four bytes of the transport header and this function is | |
142 | * written with this assumption in mind. | |
143 | */ | |
144 | ||
145 | sin.sin_family = AF_INET; | |
146 | sin.sin_addr.s_addr = iph->daddr; | |
147 | sin.sin_port = ports[1]; | |
148 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
149 | ||
150 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
151 | } | |
1da177e4 LT |
152 | |
153 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) | |
154 | { | |
155 | struct inet_sock *inet = inet_sk(skb->sk); | |
156 | unsigned flags = inet->cmsg_flags; | |
157 | ||
158 | /* Ordered by supposed usage frequency */ | |
159 | if (flags & 1) | |
160 | ip_cmsg_recv_pktinfo(msg, skb); | |
4d52cfbe | 161 | if ((flags >>= 1) == 0) |
1da177e4 LT |
162 | return; |
163 | ||
164 | if (flags & 1) | |
165 | ip_cmsg_recv_ttl(msg, skb); | |
4d52cfbe | 166 | if ((flags >>= 1) == 0) |
1da177e4 LT |
167 | return; |
168 | ||
169 | if (flags & 1) | |
170 | ip_cmsg_recv_tos(msg, skb); | |
4d52cfbe | 171 | if ((flags >>= 1) == 0) |
1da177e4 LT |
172 | return; |
173 | ||
174 | if (flags & 1) | |
175 | ip_cmsg_recv_opts(msg, skb); | |
4d52cfbe | 176 | if ((flags >>= 1) == 0) |
1da177e4 LT |
177 | return; |
178 | ||
179 | if (flags & 1) | |
180 | ip_cmsg_recv_retopts(msg, skb); | |
4d52cfbe | 181 | if ((flags >>= 1) == 0) |
2c7946a7 CZ |
182 | return; |
183 | ||
184 | if (flags & 1) | |
185 | ip_cmsg_recv_security(msg, skb); | |
e8b2dfe9 | 186 | |
4d52cfbe | 187 | if ((flags >>= 1) == 0) |
e8b2dfe9 BS |
188 | return; |
189 | if (flags & 1) | |
190 | ip_cmsg_recv_dstaddr(msg, skb); | |
191 | ||
1da177e4 | 192 | } |
4d52cfbe | 193 | EXPORT_SYMBOL(ip_cmsg_recv); |
1da177e4 | 194 | |
7a6adb92 | 195 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
1da177e4 LT |
196 | { |
197 | int err; | |
198 | struct cmsghdr *cmsg; | |
199 | ||
200 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
201 | if (!CMSG_OK(msg, cmsg)) | |
202 | return -EINVAL; | |
203 | if (cmsg->cmsg_level != SOL_IP) | |
204 | continue; | |
205 | switch (cmsg->cmsg_type) { | |
206 | case IP_RETOPTS: | |
207 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4d52cfbe ED |
208 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
209 | err < 40 ? err : 40); | |
1da177e4 LT |
210 | if (err) |
211 | return err; | |
212 | break; | |
213 | case IP_PKTINFO: | |
214 | { | |
215 | struct in_pktinfo *info; | |
216 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
217 | return -EINVAL; | |
218 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
219 | ipc->oif = info->ipi_ifindex; | |
220 | ipc->addr = info->ipi_spec_dst.s_addr; | |
221 | break; | |
222 | } | |
223 | default: | |
224 | return -EINVAL; | |
225 | } | |
226 | } | |
227 | return 0; | |
228 | } | |
229 | ||
230 | ||
231 | /* Special input handler for packets caught by router alert option. | |
232 | They are selected only by protocol field, and then processed likely | |
233 | local ones; but only if someone wants them! Otherwise, router | |
234 | not running rsvpd will kill RSVP. | |
235 | ||
236 | It is user level problem, what it will make with them. | |
237 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
238 | but receiver should be enough clever f.e. to forward mtrace requests, | |
239 | sent to multicast group to reach destination designated router. | |
240 | */ | |
241 | struct ip_ra_chain *ip_ra_chain; | |
242 | DEFINE_RWLOCK(ip_ra_lock); | |
243 | ||
4d52cfbe ED |
244 | int ip_ra_control(struct sock *sk, unsigned char on, |
245 | void (*destructor)(struct sock *)) | |
1da177e4 LT |
246 | { |
247 | struct ip_ra_chain *ra, *new_ra, **rap; | |
248 | ||
c720c7e8 | 249 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
250 | return -EINVAL; |
251 | ||
252 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
253 | ||
254 | write_lock_bh(&ip_ra_lock); | |
4d52cfbe | 255 | for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) { |
1da177e4 LT |
256 | if (ra->sk == sk) { |
257 | if (on) { | |
258 | write_unlock_bh(&ip_ra_lock); | |
a51482bd | 259 | kfree(new_ra); |
1da177e4 LT |
260 | return -EADDRINUSE; |
261 | } | |
262 | *rap = ra->next; | |
263 | write_unlock_bh(&ip_ra_lock); | |
264 | ||
265 | if (ra->destructor) | |
266 | ra->destructor(sk); | |
267 | sock_put(sk); | |
268 | kfree(ra); | |
269 | return 0; | |
270 | } | |
271 | } | |
272 | if (new_ra == NULL) { | |
273 | write_unlock_bh(&ip_ra_lock); | |
274 | return -ENOBUFS; | |
275 | } | |
276 | new_ra->sk = sk; | |
277 | new_ra->destructor = destructor; | |
278 | ||
279 | new_ra->next = ra; | |
280 | *rap = new_ra; | |
281 | sock_hold(sk); | |
282 | write_unlock_bh(&ip_ra_lock); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
e905a9ed | 287 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 288 | __be16 port, u32 info, u8 *payload) |
1da177e4 LT |
289 | { |
290 | struct inet_sock *inet = inet_sk(sk); | |
291 | struct sock_exterr_skb *serr; | |
292 | ||
293 | if (!inet->recverr) | |
294 | return; | |
295 | ||
296 | skb = skb_clone(skb, GFP_ATOMIC); | |
297 | if (!skb) | |
298 | return; | |
299 | ||
e905a9ed | 300 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
301 | serr->ee.ee_errno = err; |
302 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
303 | serr->ee.ee_type = icmp_hdr(skb)->type; |
304 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
305 | serr->ee.ee_pad = 0; |
306 | serr->ee.ee_info = info; | |
307 | serr->ee.ee_data = 0; | |
88c7664f | 308 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 309 | skb_network_header(skb); |
1da177e4 LT |
310 | serr->port = port; |
311 | ||
bd82393c ACM |
312 | if (skb_pull(skb, payload - skb->data) != NULL) { |
313 | skb_reset_transport_header(skb); | |
314 | if (sock_queue_err_skb(sk, skb) == 0) | |
315 | return; | |
316 | } | |
317 | kfree_skb(skb); | |
1da177e4 LT |
318 | } |
319 | ||
0579016e | 320 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
321 | { |
322 | struct inet_sock *inet = inet_sk(sk); | |
323 | struct sock_exterr_skb *serr; | |
324 | struct iphdr *iph; | |
325 | struct sk_buff *skb; | |
326 | ||
327 | if (!inet->recverr) | |
328 | return; | |
329 | ||
330 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
331 | if (!skb) | |
332 | return; | |
333 | ||
2ca9e6f2 ACM |
334 | skb_put(skb, sizeof(struct iphdr)); |
335 | skb_reset_network_header(skb); | |
eddc9ec5 | 336 | iph = ip_hdr(skb); |
1da177e4 LT |
337 | iph->daddr = daddr; |
338 | ||
e905a9ed | 339 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
340 | serr->ee.ee_errno = err; |
341 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 342 | serr->ee.ee_type = 0; |
1da177e4 LT |
343 | serr->ee.ee_code = 0; |
344 | serr->ee.ee_pad = 0; | |
345 | serr->ee.ee_info = info; | |
346 | serr->ee.ee_data = 0; | |
d56f90a7 | 347 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
348 | serr->port = port; |
349 | ||
27a884dc | 350 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 351 | skb_reset_transport_header(skb); |
1da177e4 LT |
352 | |
353 | if (sock_queue_err_skb(sk, skb)) | |
354 | kfree_skb(skb); | |
355 | } | |
356 | ||
e905a9ed | 357 | /* |
1da177e4 LT |
358 | * Handle MSG_ERRQUEUE |
359 | */ | |
360 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
361 | { | |
362 | struct sock_exterr_skb *serr; | |
363 | struct sk_buff *skb, *skb2; | |
364 | struct sockaddr_in *sin; | |
365 | struct { | |
366 | struct sock_extended_err ee; | |
367 | struct sockaddr_in offender; | |
368 | } errhdr; | |
369 | int err; | |
370 | int copied; | |
371 | ||
372 | err = -EAGAIN; | |
373 | skb = skb_dequeue(&sk->sk_error_queue); | |
374 | if (skb == NULL) | |
375 | goto out; | |
376 | ||
377 | copied = skb->len; | |
378 | if (copied > len) { | |
379 | msg->msg_flags |= MSG_TRUNC; | |
380 | copied = len; | |
381 | } | |
382 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
383 | if (err) | |
384 | goto out_free_skb; | |
385 | ||
386 | sock_recv_timestamp(msg, sk, skb); | |
387 | ||
388 | serr = SKB_EXT_ERR(skb); | |
389 | ||
390 | sin = (struct sockaddr_in *)msg->msg_name; | |
391 | if (sin) { | |
392 | sin->sin_family = AF_INET; | |
d56f90a7 ACM |
393 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
394 | serr->addr_offset); | |
1da177e4 LT |
395 | sin->sin_port = serr->port; |
396 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
397 | } | |
398 | ||
399 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
400 | sin = &errhdr.offender; | |
401 | sin->sin_family = AF_UNSPEC; | |
402 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { | |
403 | struct inet_sock *inet = inet_sk(sk); | |
404 | ||
405 | sin->sin_family = AF_INET; | |
eddc9ec5 | 406 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
407 | sin->sin_port = 0; |
408 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
409 | if (inet->cmsg_flags) | |
410 | ip_cmsg_recv(msg, skb); | |
411 | } | |
412 | ||
413 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
414 | ||
415 | /* Now we could try to dump offended packet options */ | |
416 | ||
417 | msg->msg_flags |= MSG_ERRQUEUE; | |
418 | err = copied; | |
419 | ||
420 | /* Reset and regenerate socket error */ | |
e0f9f858 | 421 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 422 | sk->sk_err = 0; |
4d52cfbe ED |
423 | skb2 = skb_peek(&sk->sk_error_queue); |
424 | if (skb2 != NULL) { | |
1da177e4 | 425 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
e0f9f858 | 426 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
427 | sk->sk_error_report(sk); |
428 | } else | |
e0f9f858 | 429 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 430 | |
e905a9ed | 431 | out_free_skb: |
1da177e4 LT |
432 | kfree_skb(skb); |
433 | out: | |
434 | return err; | |
435 | } | |
436 | ||
437 | ||
438 | /* | |
4d52cfbe ED |
439 | * Socket option code for IP. This is the end of the line after any |
440 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
441 | */ |
442 | ||
3fdadf7d | 443 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 444 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
445 | { |
446 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 447 | int val = 0, err; |
1da177e4 | 448 | |
e905a9ed | 449 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
132adf54 SH |
450 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
451 | (1<<IP_RETOPTS) | (1<<IP_TOS) | | |
452 | (1<<IP_TTL) | (1<<IP_HDRINCL) | | |
453 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | | |
454 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | | |
d218d111 SH |
455 | (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) | |
456 | (1<<IP_MINTTL))) || | |
132adf54 | 457 | optname == IP_MULTICAST_TTL || |
f771bef9 | 458 | optname == IP_MULTICAST_ALL || |
e8b2dfe9 BS |
459 | optname == IP_MULTICAST_LOOP || |
460 | optname == IP_RECVORIGDSTADDR) { | |
1da177e4 LT |
461 | if (optlen >= sizeof(int)) { |
462 | if (get_user(val, (int __user *) optval)) | |
463 | return -EFAULT; | |
464 | } else if (optlen >= sizeof(char)) { | |
465 | unsigned char ucval; | |
466 | ||
467 | if (get_user(ucval, (unsigned char __user *) optval)) | |
468 | return -EFAULT; | |
469 | val = (int) ucval; | |
470 | } | |
471 | } | |
472 | ||
473 | /* If optlen==0, it is equivalent to val == 0 */ | |
474 | ||
6a9fb947 | 475 | if (ip_mroute_opt(optname)) |
09cb105e | 476 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
477 | |
478 | err = 0; | |
479 | lock_sock(sk); | |
480 | ||
481 | switch (optname) { | |
132adf54 SH |
482 | case IP_OPTIONS: |
483 | { | |
4d52cfbe | 484 | struct ip_options *opt = NULL; |
65a1c4ff | 485 | if (optlen > 40) |
132adf54 | 486 | goto e_inval; |
3b1e0a65 | 487 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 488 | optval, optlen); |
132adf54 SH |
489 | if (err) |
490 | break; | |
491 | if (inet->is_icsk) { | |
492 | struct inet_connection_sock *icsk = inet_csk(sk); | |
1da177e4 | 493 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
132adf54 SH |
494 | if (sk->sk_family == PF_INET || |
495 | (!((1 << sk->sk_state) & | |
496 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 497 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 498 | #endif |
132adf54 SH |
499 | if (inet->opt) |
500 | icsk->icsk_ext_hdr_len -= inet->opt->optlen; | |
501 | if (opt) | |
502 | icsk->icsk_ext_hdr_len += opt->optlen; | |
503 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); | |
1da177e4 | 504 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1da177e4 | 505 | } |
132adf54 | 506 | #endif |
1da177e4 | 507 | } |
132adf54 SH |
508 | opt = xchg(&inet->opt, opt); |
509 | kfree(opt); | |
510 | break; | |
511 | } | |
512 | case IP_PKTINFO: | |
513 | if (val) | |
514 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
515 | else | |
516 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
517 | break; | |
518 | case IP_RECVTTL: | |
519 | if (val) | |
520 | inet->cmsg_flags |= IP_CMSG_TTL; | |
521 | else | |
522 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
523 | break; | |
524 | case IP_RECVTOS: | |
525 | if (val) | |
526 | inet->cmsg_flags |= IP_CMSG_TOS; | |
527 | else | |
528 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
529 | break; | |
530 | case IP_RECVOPTS: | |
531 | if (val) | |
532 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
533 | else | |
534 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
535 | break; | |
536 | case IP_RETOPTS: | |
537 | if (val) | |
538 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
539 | else | |
540 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
541 | break; | |
542 | case IP_PASSSEC: | |
543 | if (val) | |
544 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
545 | else | |
546 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
547 | break; | |
e8b2dfe9 BS |
548 | case IP_RECVORIGDSTADDR: |
549 | if (val) | |
550 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
551 | else | |
552 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
553 | break; | |
132adf54 SH |
554 | case IP_TOS: /* This sets both TOS and Precedence */ |
555 | if (sk->sk_type == SOCK_STREAM) { | |
556 | val &= ~3; | |
557 | val |= inet->tos & 3; | |
558 | } | |
132adf54 SH |
559 | if (inet->tos != val) { |
560 | inet->tos = val; | |
561 | sk->sk_priority = rt_tos2priority(val); | |
562 | sk_dst_reset(sk); | |
563 | } | |
564 | break; | |
565 | case IP_TTL: | |
4d52cfbe | 566 | if (optlen < 1) |
132adf54 | 567 | goto e_inval; |
4d52cfbe | 568 | if (val != -1 && (val < 0 || val > 255)) |
132adf54 SH |
569 | goto e_inval; |
570 | inet->uc_ttl = val; | |
571 | break; | |
572 | case IP_HDRINCL: | |
573 | if (sk->sk_type != SOCK_RAW) { | |
574 | err = -ENOPROTOOPT; | |
2c7946a7 | 575 | break; |
132adf54 SH |
576 | } |
577 | inet->hdrincl = val ? 1 : 0; | |
578 | break; | |
579 | case IP_MTU_DISCOVER: | |
0eae750e | 580 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
132adf54 SH |
581 | goto e_inval; |
582 | inet->pmtudisc = val; | |
583 | break; | |
584 | case IP_RECVERR: | |
585 | inet->recverr = !!val; | |
586 | if (!val) | |
587 | skb_queue_purge(&sk->sk_error_queue); | |
588 | break; | |
589 | case IP_MULTICAST_TTL: | |
590 | if (sk->sk_type == SOCK_STREAM) | |
591 | goto e_inval; | |
4d52cfbe | 592 | if (optlen < 1) |
132adf54 | 593 | goto e_inval; |
09cb105e | 594 | if (val == -1) |
132adf54 SH |
595 | val = 1; |
596 | if (val < 0 || val > 255) | |
597 | goto e_inval; | |
598 | inet->mc_ttl = val; | |
599 | break; | |
600 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 601 | if (optlen < 1) |
132adf54 SH |
602 | goto e_inval; |
603 | inet->mc_loop = !!val; | |
604 | break; | |
605 | case IP_MULTICAST_IF: | |
606 | { | |
607 | struct ip_mreqn mreq; | |
608 | struct net_device *dev = NULL; | |
609 | ||
610 | if (sk->sk_type == SOCK_STREAM) | |
611 | goto e_inval; | |
612 | /* | |
613 | * Check the arguments are allowable | |
614 | */ | |
615 | ||
0915921b SW |
616 | if (optlen < sizeof(struct in_addr)) |
617 | goto e_inval; | |
618 | ||
132adf54 SH |
619 | err = -EFAULT; |
620 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 621 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 622 | break; |
132adf54 SH |
623 | } else { |
624 | memset(&mreq, 0, sizeof(mreq)); | |
625 | if (optlen >= sizeof(struct in_addr) && | |
4d52cfbe ED |
626 | copy_from_user(&mreq.imr_address, optval, |
627 | sizeof(struct in_addr))) | |
132adf54 SH |
628 | break; |
629 | } | |
630 | ||
631 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 632 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
633 | inet->mc_index = 0; |
634 | inet->mc_addr = 0; | |
635 | err = 0; | |
1da177e4 LT |
636 | break; |
637 | } | |
3b1e0a65 | 638 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 639 | if (dev) |
132adf54 | 640 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 641 | } else |
55b80503 | 642 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 643 | |
1da177e4 | 644 | |
132adf54 SH |
645 | err = -EADDRNOTAVAIL; |
646 | if (!dev) | |
647 | break; | |
55b80503 | 648 | dev_put(dev); |
132adf54 SH |
649 | |
650 | err = -EINVAL; | |
651 | if (sk->sk_bound_dev_if && | |
652 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
653 | break; | |
1da177e4 | 654 | |
132adf54 SH |
655 | inet->mc_index = mreq.imr_ifindex; |
656 | inet->mc_addr = mreq.imr_address.s_addr; | |
657 | err = 0; | |
658 | break; | |
659 | } | |
1da177e4 | 660 | |
132adf54 SH |
661 | case IP_ADD_MEMBERSHIP: |
662 | case IP_DROP_MEMBERSHIP: | |
663 | { | |
664 | struct ip_mreqn mreq; | |
1da177e4 | 665 | |
a96fb49b FL |
666 | err = -EPROTO; |
667 | if (inet_sk(sk)->is_icsk) | |
668 | break; | |
669 | ||
132adf54 SH |
670 | if (optlen < sizeof(struct ip_mreq)) |
671 | goto e_inval; | |
672 | err = -EFAULT; | |
673 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 674 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 675 | break; |
132adf54 SH |
676 | } else { |
677 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 678 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 679 | break; |
132adf54 | 680 | } |
1da177e4 | 681 | |
132adf54 SH |
682 | if (optname == IP_ADD_MEMBERSHIP) |
683 | err = ip_mc_join_group(sk, &mreq); | |
684 | else | |
685 | err = ip_mc_leave_group(sk, &mreq); | |
686 | break; | |
687 | } | |
688 | case IP_MSFILTER: | |
689 | { | |
132adf54 SH |
690 | struct ip_msfilter *msf; |
691 | ||
692 | if (optlen < IP_MSFILTER_SIZE(0)) | |
693 | goto e_inval; | |
694 | if (optlen > sysctl_optmem_max) { | |
695 | err = -ENOBUFS; | |
1da177e4 LT |
696 | break; |
697 | } | |
132adf54 | 698 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 699 | if (!msf) { |
132adf54 SH |
700 | err = -ENOBUFS; |
701 | break; | |
702 | } | |
703 | err = -EFAULT; | |
704 | if (copy_from_user(msf, optval, optlen)) { | |
705 | kfree(msf); | |
706 | break; | |
707 | } | |
708 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
709 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
710 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
711 | kfree(msf); | |
712 | err = -ENOBUFS; | |
713 | break; | |
714 | } | |
715 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
716 | kfree(msf); | |
717 | err = -EINVAL; | |
718 | break; | |
719 | } | |
720 | err = ip_mc_msfilter(sk, msf, 0); | |
721 | kfree(msf); | |
722 | break; | |
723 | } | |
724 | case IP_BLOCK_SOURCE: | |
725 | case IP_UNBLOCK_SOURCE: | |
726 | case IP_ADD_SOURCE_MEMBERSHIP: | |
727 | case IP_DROP_SOURCE_MEMBERSHIP: | |
728 | { | |
729 | struct ip_mreq_source mreqs; | |
730 | int omode, add; | |
1da177e4 | 731 | |
132adf54 SH |
732 | if (optlen != sizeof(struct ip_mreq_source)) |
733 | goto e_inval; | |
734 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 735 | err = -EFAULT; |
1da177e4 LT |
736 | break; |
737 | } | |
132adf54 SH |
738 | if (optname == IP_BLOCK_SOURCE) { |
739 | omode = MCAST_EXCLUDE; | |
740 | add = 1; | |
741 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
742 | omode = MCAST_EXCLUDE; | |
743 | add = 0; | |
744 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
745 | struct ip_mreqn mreq; | |
1da177e4 | 746 | |
132adf54 SH |
747 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
748 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
749 | mreq.imr_ifindex = 0; | |
750 | err = ip_mc_join_group(sk, &mreq); | |
751 | if (err && err != -EADDRINUSE) | |
1da177e4 | 752 | break; |
132adf54 SH |
753 | omode = MCAST_INCLUDE; |
754 | add = 1; | |
755 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
756 | omode = MCAST_INCLUDE; | |
757 | add = 0; | |
758 | } | |
759 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
760 | break; | |
761 | } | |
762 | case MCAST_JOIN_GROUP: | |
763 | case MCAST_LEAVE_GROUP: | |
764 | { | |
765 | struct group_req greq; | |
766 | struct sockaddr_in *psin; | |
767 | struct ip_mreqn mreq; | |
768 | ||
769 | if (optlen < sizeof(struct group_req)) | |
770 | goto e_inval; | |
771 | err = -EFAULT; | |
772 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
773 | break; | |
774 | psin = (struct sockaddr_in *)&greq.gr_group; | |
775 | if (psin->sin_family != AF_INET) | |
776 | goto e_inval; | |
777 | memset(&mreq, 0, sizeof(mreq)); | |
778 | mreq.imr_multiaddr = psin->sin_addr; | |
779 | mreq.imr_ifindex = greq.gr_interface; | |
780 | ||
781 | if (optname == MCAST_JOIN_GROUP) | |
782 | err = ip_mc_join_group(sk, &mreq); | |
783 | else | |
784 | err = ip_mc_leave_group(sk, &mreq); | |
785 | break; | |
786 | } | |
787 | case MCAST_JOIN_SOURCE_GROUP: | |
788 | case MCAST_LEAVE_SOURCE_GROUP: | |
789 | case MCAST_BLOCK_SOURCE: | |
790 | case MCAST_UNBLOCK_SOURCE: | |
791 | { | |
792 | struct group_source_req greqs; | |
793 | struct ip_mreq_source mreqs; | |
794 | struct sockaddr_in *psin; | |
795 | int omode, add; | |
796 | ||
797 | if (optlen != sizeof(struct group_source_req)) | |
798 | goto e_inval; | |
799 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 800 | err = -EFAULT; |
1da177e4 LT |
801 | break; |
802 | } | |
132adf54 SH |
803 | if (greqs.gsr_group.ss_family != AF_INET || |
804 | greqs.gsr_source.ss_family != AF_INET) { | |
805 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
806 | break; |
807 | } | |
132adf54 SH |
808 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
809 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
810 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
811 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
812 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
813 | ||
814 | if (optname == MCAST_BLOCK_SOURCE) { | |
815 | omode = MCAST_EXCLUDE; | |
816 | add = 1; | |
817 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
818 | omode = MCAST_EXCLUDE; | |
819 | add = 0; | |
820 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
821 | struct ip_mreqn mreq; |
822 | ||
132adf54 | 823 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 824 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
825 | mreq.imr_address.s_addr = 0; |
826 | mreq.imr_ifindex = greqs.gsr_interface; | |
827 | err = ip_mc_join_group(sk, &mreq); | |
828 | if (err && err != -EADDRINUSE) | |
829 | break; | |
830 | greqs.gsr_interface = mreq.imr_ifindex; | |
831 | omode = MCAST_INCLUDE; | |
832 | add = 1; | |
833 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
834 | omode = MCAST_INCLUDE; | |
835 | add = 0; | |
836 | } | |
837 | err = ip_mc_source(add, omode, sk, &mreqs, | |
838 | greqs.gsr_interface); | |
839 | break; | |
840 | } | |
841 | case MCAST_MSFILTER: | |
842 | { | |
132adf54 SH |
843 | struct sockaddr_in *psin; |
844 | struct ip_msfilter *msf = NULL; | |
845 | struct group_filter *gsf = NULL; | |
846 | int msize, i, ifindex; | |
847 | ||
848 | if (optlen < GROUP_FILTER_SIZE(0)) | |
849 | goto e_inval; | |
850 | if (optlen > sysctl_optmem_max) { | |
851 | err = -ENOBUFS; | |
1da177e4 LT |
852 | break; |
853 | } | |
09cb105e | 854 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 855 | if (!gsf) { |
132adf54 | 856 | err = -ENOBUFS; |
1da177e4 LT |
857 | break; |
858 | } | |
132adf54 | 859 | err = -EFAULT; |
4d52cfbe | 860 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 861 | goto mc_msf_out; |
4d52cfbe | 862 | |
132adf54 SH |
863 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
864 | if (gsf->gf_numsrc >= 0x1ffffff || | |
865 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
866 | err = -ENOBUFS; | |
867 | goto mc_msf_out; | |
868 | } | |
869 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
870 | err = -EINVAL; | |
871 | goto mc_msf_out; | |
872 | } | |
873 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 874 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 875 | if (!msf) { |
132adf54 SH |
876 | err = -ENOBUFS; |
877 | goto mc_msf_out; | |
878 | } | |
879 | ifindex = gsf->gf_interface; | |
880 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
881 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 882 | err = -EADDRNOTAVAIL; |
132adf54 | 883 | goto mc_msf_out; |
1da177e4 | 884 | } |
132adf54 SH |
885 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
886 | msf->imsf_interface = 0; | |
887 | msf->imsf_fmode = gsf->gf_fmode; | |
888 | msf->imsf_numsrc = gsf->gf_numsrc; | |
889 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 890 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 891 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 892 | |
132adf54 SH |
893 | if (psin->sin_family != AF_INET) |
894 | goto mc_msf_out; | |
895 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
896 | } | |
897 | kfree(gsf); | |
898 | gsf = NULL; | |
899 | ||
900 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 901 | mc_msf_out: |
132adf54 SH |
902 | kfree(msf); |
903 | kfree(gsf); | |
904 | break; | |
905 | } | |
f771bef9 NS |
906 | case IP_MULTICAST_ALL: |
907 | if (optlen < 1) | |
908 | goto e_inval; | |
909 | if (val != 0 && val != 1) | |
910 | goto e_inval; | |
911 | inet->mc_all = val; | |
912 | break; | |
132adf54 SH |
913 | case IP_ROUTER_ALERT: |
914 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
915 | break; | |
916 | ||
917 | case IP_FREEBIND: | |
4d52cfbe | 918 | if (optlen < 1) |
132adf54 SH |
919 | goto e_inval; |
920 | inet->freebind = !!val; | |
921 | break; | |
922 | ||
923 | case IP_IPSEC_POLICY: | |
924 | case IP_XFRM_POLICY: | |
925 | err = -EPERM; | |
926 | if (!capable(CAP_NET_ADMIN)) | |
1da177e4 | 927 | break; |
132adf54 SH |
928 | err = xfrm_user_policy(sk, optname, optval, optlen); |
929 | break; | |
1da177e4 | 930 | |
f5715aea KK |
931 | case IP_TRANSPARENT: |
932 | if (!capable(CAP_NET_ADMIN)) { | |
933 | err = -EPERM; | |
934 | break; | |
935 | } | |
936 | if (optlen < 1) | |
937 | goto e_inval; | |
938 | inet->transparent = !!val; | |
939 | break; | |
940 | ||
d218d111 SH |
941 | case IP_MINTTL: |
942 | if (optlen < 1) | |
943 | goto e_inval; | |
944 | if (val < 0 || val > 255) | |
945 | goto e_inval; | |
946 | inet->min_ttl = val; | |
947 | break; | |
948 | ||
132adf54 SH |
949 | default: |
950 | err = -ENOPROTOOPT; | |
951 | break; | |
1da177e4 LT |
952 | } |
953 | release_sock(sk); | |
954 | return err; | |
955 | ||
956 | e_inval: | |
957 | release_sock(sk); | |
958 | return -EINVAL; | |
959 | } | |
960 | ||
3fdadf7d | 961 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 962 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
963 | { |
964 | int err; | |
965 | ||
966 | if (level != SOL_IP) | |
967 | return -ENOPROTOOPT; | |
968 | ||
969 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
970 | #ifdef CONFIG_NETFILTER | |
971 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
972 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
973 | optname != IP_IPSEC_POLICY && |
974 | optname != IP_XFRM_POLICY && | |
975 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
976 | lock_sock(sk); |
977 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
978 | release_sock(sk); | |
979 | } | |
980 | #endif | |
981 | return err; | |
982 | } | |
4d52cfbe | 983 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
984 | |
985 | #ifdef CONFIG_COMPAT | |
543d9cfe | 986 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 987 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
988 | { |
989 | int err; | |
990 | ||
991 | if (level != SOL_IP) | |
992 | return -ENOPROTOOPT; | |
993 | ||
dae50295 DS |
994 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
995 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
996 | ip_setsockopt); | |
997 | ||
3fdadf7d DM |
998 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
999 | #ifdef CONFIG_NETFILTER | |
1000 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1001 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1002 | optname != IP_IPSEC_POLICY && |
1003 | optname != IP_XFRM_POLICY && | |
1004 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1005 | lock_sock(sk); |
543d9cfe ACM |
1006 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1007 | optval, optlen); | |
3fdadf7d DM |
1008 | release_sock(sk); |
1009 | } | |
1010 | #endif | |
1011 | return err; | |
1012 | } | |
543d9cfe | 1013 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1014 | #endif |
1015 | ||
1da177e4 | 1016 | /* |
4d52cfbe ED |
1017 | * Get the options. Note for future reference. The GET of IP options gets |
1018 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1019 | */ |
1020 | ||
3fdadf7d | 1021 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
132adf54 | 1022 | char __user *optval, int __user *optlen) |
1da177e4 LT |
1023 | { |
1024 | struct inet_sock *inet = inet_sk(sk); | |
1025 | int val; | |
1026 | int len; | |
e905a9ed | 1027 | |
132adf54 | 1028 | if (level != SOL_IP) |
1da177e4 LT |
1029 | return -EOPNOTSUPP; |
1030 | ||
6a9fb947 | 1031 | if (ip_mroute_opt(optname)) |
09cb105e | 1032 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1033 | |
09cb105e | 1034 | if (get_user(len, optlen)) |
1da177e4 | 1035 | return -EFAULT; |
132adf54 | 1036 | if (len < 0) |
1da177e4 | 1037 | return -EINVAL; |
e905a9ed | 1038 | |
1da177e4 LT |
1039 | lock_sock(sk); |
1040 | ||
132adf54 SH |
1041 | switch (optname) { |
1042 | case IP_OPTIONS: | |
1043 | { | |
1044 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
09cb105e | 1045 | struct ip_options * opt = (struct ip_options *)optbuf; |
132adf54 SH |
1046 | opt->optlen = 0; |
1047 | if (inet->opt) | |
1048 | memcpy(optbuf, inet->opt, | |
1049 | sizeof(struct ip_options)+ | |
1050 | inet->opt->optlen); | |
1051 | release_sock(sk); | |
1052 | ||
1053 | if (opt->optlen == 0) | |
1054 | return put_user(0, optlen); | |
1055 | ||
1056 | ip_options_undo(opt); | |
1057 | ||
1058 | len = min_t(unsigned int, len, opt->optlen); | |
1059 | if (put_user(len, optlen)) | |
1060 | return -EFAULT; | |
1061 | if (copy_to_user(optval, opt->__data, len)) | |
1062 | return -EFAULT; | |
1063 | return 0; | |
1064 | } | |
1065 | case IP_PKTINFO: | |
1066 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1067 | break; | |
1068 | case IP_RECVTTL: | |
1069 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1070 | break; | |
1071 | case IP_RECVTOS: | |
1072 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1073 | break; | |
1074 | case IP_RECVOPTS: | |
1075 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1076 | break; | |
1077 | case IP_RETOPTS: | |
1078 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1079 | break; | |
1080 | case IP_PASSSEC: | |
1081 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1082 | break; | |
e8b2dfe9 BS |
1083 | case IP_RECVORIGDSTADDR: |
1084 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1085 | break; | |
132adf54 SH |
1086 | case IP_TOS: |
1087 | val = inet->tos; | |
1088 | break; | |
1089 | case IP_TTL: | |
1090 | val = (inet->uc_ttl == -1 ? | |
1091 | sysctl_ip_default_ttl : | |
1092 | inet->uc_ttl); | |
1093 | break; | |
1094 | case IP_HDRINCL: | |
1095 | val = inet->hdrincl; | |
1096 | break; | |
1097 | case IP_MTU_DISCOVER: | |
1098 | val = inet->pmtudisc; | |
1099 | break; | |
1100 | case IP_MTU: | |
1101 | { | |
1102 | struct dst_entry *dst; | |
1103 | val = 0; | |
1104 | dst = sk_dst_get(sk); | |
1105 | if (dst) { | |
1106 | val = dst_mtu(dst); | |
1107 | dst_release(dst); | |
1da177e4 | 1108 | } |
132adf54 | 1109 | if (!val) { |
1da177e4 | 1110 | release_sock(sk); |
132adf54 | 1111 | return -ENOTCONN; |
1da177e4 | 1112 | } |
132adf54 SH |
1113 | break; |
1114 | } | |
1115 | case IP_RECVERR: | |
1116 | val = inet->recverr; | |
1117 | break; | |
1118 | case IP_MULTICAST_TTL: | |
1119 | val = inet->mc_ttl; | |
1120 | break; | |
1121 | case IP_MULTICAST_LOOP: | |
1122 | val = inet->mc_loop; | |
1123 | break; | |
1124 | case IP_MULTICAST_IF: | |
1125 | { | |
1126 | struct in_addr addr; | |
1127 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1128 | addr.s_addr = inet->mc_addr; | |
1129 | release_sock(sk); | |
1da177e4 | 1130 | |
132adf54 SH |
1131 | if (put_user(len, optlen)) |
1132 | return -EFAULT; | |
1133 | if (copy_to_user(optval, &addr, len)) | |
1134 | return -EFAULT; | |
1135 | return 0; | |
1136 | } | |
1137 | case IP_MSFILTER: | |
1138 | { | |
1139 | struct ip_msfilter msf; | |
1140 | int err; | |
1141 | ||
1142 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1143 | release_sock(sk); |
132adf54 | 1144 | return -EINVAL; |
1da177e4 | 1145 | } |
132adf54 | 1146 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1147 | release_sock(sk); |
132adf54 | 1148 | return -EFAULT; |
1da177e4 | 1149 | } |
132adf54 SH |
1150 | err = ip_mc_msfget(sk, &msf, |
1151 | (struct ip_msfilter __user *)optval, optlen); | |
1152 | release_sock(sk); | |
1153 | return err; | |
1154 | } | |
1155 | case MCAST_MSFILTER: | |
1156 | { | |
1157 | struct group_filter gsf; | |
1158 | int err; | |
1da177e4 | 1159 | |
132adf54 | 1160 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1161 | release_sock(sk); |
132adf54 SH |
1162 | return -EINVAL; |
1163 | } | |
1164 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1165 | release_sock(sk); | |
1166 | return -EFAULT; | |
1167 | } | |
1168 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1169 | (struct group_filter __user *)optval, |
1170 | optlen); | |
132adf54 SH |
1171 | release_sock(sk); |
1172 | return err; | |
1173 | } | |
f771bef9 NS |
1174 | case IP_MULTICAST_ALL: |
1175 | val = inet->mc_all; | |
1176 | break; | |
132adf54 SH |
1177 | case IP_PKTOPTIONS: |
1178 | { | |
1179 | struct msghdr msg; | |
1da177e4 | 1180 | |
132adf54 | 1181 | release_sock(sk); |
1da177e4 | 1182 | |
132adf54 SH |
1183 | if (sk->sk_type != SOCK_STREAM) |
1184 | return -ENOPROTOOPT; | |
1da177e4 | 1185 | |
132adf54 SH |
1186 | msg.msg_control = optval; |
1187 | msg.msg_controllen = len; | |
1188 | msg.msg_flags = 0; | |
1da177e4 | 1189 | |
132adf54 SH |
1190 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1191 | struct in_pktinfo info; | |
1192 | ||
c720c7e8 ED |
1193 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1194 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1195 | info.ipi_ifindex = inet->mc_index; |
1196 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1197 | } |
132adf54 SH |
1198 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1199 | int hlim = inet->mc_ttl; | |
1200 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1201 | } | |
1202 | len -= msg.msg_controllen; | |
1203 | return put_user(len, optlen); | |
1204 | } | |
1205 | case IP_FREEBIND: | |
1206 | val = inet->freebind; | |
1207 | break; | |
f5715aea KK |
1208 | case IP_TRANSPARENT: |
1209 | val = inet->transparent; | |
1210 | break; | |
d218d111 SH |
1211 | case IP_MINTTL: |
1212 | val = inet->min_ttl; | |
1213 | break; | |
132adf54 SH |
1214 | default: |
1215 | release_sock(sk); | |
1216 | return -ENOPROTOOPT; | |
1da177e4 LT |
1217 | } |
1218 | release_sock(sk); | |
e905a9ed | 1219 | |
4d52cfbe | 1220 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1221 | unsigned char ucval = (unsigned char)val; |
1222 | len = 1; | |
132adf54 | 1223 | if (put_user(len, optlen)) |
1da177e4 | 1224 | return -EFAULT; |
09cb105e | 1225 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1226 | return -EFAULT; |
1227 | } else { | |
1228 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1229 | if (put_user(len, optlen)) |
1da177e4 | 1230 | return -EFAULT; |
09cb105e | 1231 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1232 | return -EFAULT; |
1233 | } | |
1234 | return 0; | |
1235 | } | |
1236 | ||
3fdadf7d | 1237 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1238 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1239 | { |
1240 | int err; | |
1241 | ||
1242 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); | |
1243 | #ifdef CONFIG_NETFILTER | |
1244 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1245 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1246 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1247 | int len; |
3fdadf7d | 1248 | |
09cb105e | 1249 | if (get_user(len, optlen)) |
3fdadf7d DM |
1250 | return -EFAULT; |
1251 | ||
1252 | lock_sock(sk); | |
1253 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1254 | &len); | |
1255 | release_sock(sk); | |
1256 | if (err >= 0) | |
1257 | err = put_user(len, optlen); | |
1258 | return err; | |
1259 | } | |
1260 | #endif | |
1261 | return err; | |
1262 | } | |
4d52cfbe | 1263 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1264 | |
1265 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1266 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1267 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1268 | { |
42908c69 DS |
1269 | int err; |
1270 | ||
1271 | if (optname == MCAST_MSFILTER) | |
1272 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1273 | ip_getsockopt); | |
1274 | ||
1275 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); | |
1276 | ||
3fdadf7d DM |
1277 | #ifdef CONFIG_NETFILTER |
1278 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1279 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1280 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1281 | int len; |
3fdadf7d | 1282 | |
543d9cfe | 1283 | if (get_user(len, optlen)) |
3fdadf7d DM |
1284 | return -EFAULT; |
1285 | ||
1286 | lock_sock(sk); | |
543d9cfe | 1287 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1288 | release_sock(sk); |
1289 | if (err >= 0) | |
1290 | err = put_user(len, optlen); | |
1291 | return err; | |
1292 | } | |
1293 | #endif | |
1294 | return err; | |
1295 | } | |
543d9cfe | 1296 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1297 | #endif |