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> |
dfd56b8b | 40 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
41 | #include <net/transp_v6.h> |
42 | #endif | |
43 | ||
44 | #include <linux/errqueue.h> | |
45 | #include <asm/uaccess.h> | |
46 | ||
47 | #define IP_CMSG_PKTINFO 1 | |
48 | #define IP_CMSG_TTL 2 | |
49 | #define IP_CMSG_TOS 4 | |
50 | #define IP_CMSG_RECVOPTS 8 | |
51 | #define IP_CMSG_RETOPTS 16 | |
2c7946a7 | 52 | #define IP_CMSG_PASSSEC 32 |
e8b2dfe9 | 53 | #define IP_CMSG_ORIGDSTADDR 64 |
1da177e4 LT |
54 | |
55 | /* | |
56 | * SOL_IP control messages. | |
57 | */ | |
d826eb14 | 58 | #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb)) |
1da177e4 LT |
59 | |
60 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
61 | { | |
d826eb14 | 62 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 63 | |
eddc9ec5 | 64 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
65 | |
66 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
67 | } | |
68 | ||
69 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
70 | { | |
eddc9ec5 | 71 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
72 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
73 | } | |
74 | ||
75 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
76 | { | |
eddc9ec5 | 77 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
78 | } |
79 | ||
80 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
81 | { | |
82 | if (IPCB(skb)->opt.optlen == 0) | |
83 | return; | |
84 | ||
eddc9ec5 ACM |
85 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
86 | ip_hdr(skb) + 1); | |
1da177e4 LT |
87 | } |
88 | ||
89 | ||
90 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
91 | { | |
92 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 93 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
94 | |
95 | if (IPCB(skb)->opt.optlen == 0) | |
96 | return; | |
97 | ||
98 | if (ip_options_echo(opt, skb)) { | |
99 | msg->msg_flags |= MSG_CTRUNC; | |
100 | return; | |
101 | } | |
102 | ip_options_undo(opt); | |
103 | ||
104 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
105 | } | |
106 | ||
2c7946a7 CZ |
107 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
108 | { | |
109 | char *secdata; | |
dc49c1f9 | 110 | u32 seclen, secid; |
2c7946a7 CZ |
111 | int err; |
112 | ||
dc49c1f9 CZ |
113 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
114 | if (err) | |
115 | return; | |
116 | ||
117 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
118 | if (err) |
119 | return; | |
120 | ||
121 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 122 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
123 | } |
124 | ||
21d1a161 | 125 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
126 | { |
127 | struct sockaddr_in sin; | |
b71d1d42 | 128 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 129 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
130 | |
131 | if (skb_transport_offset(skb) + 4 > skb->len) | |
132 | return; | |
133 | ||
134 | /* All current transport protocols have the port numbers in the | |
135 | * first four bytes of the transport header and this function is | |
136 | * written with this assumption in mind. | |
137 | */ | |
138 | ||
139 | sin.sin_family = AF_INET; | |
140 | sin.sin_addr.s_addr = iph->daddr; | |
141 | sin.sin_port = ports[1]; | |
142 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
143 | ||
144 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
145 | } | |
1da177e4 LT |
146 | |
147 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) | |
148 | { | |
149 | struct inet_sock *inet = inet_sk(skb->sk); | |
95c96174 | 150 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
151 | |
152 | /* Ordered by supposed usage frequency */ | |
153 | if (flags & 1) | |
154 | ip_cmsg_recv_pktinfo(msg, skb); | |
4d52cfbe | 155 | if ((flags >>= 1) == 0) |
1da177e4 LT |
156 | return; |
157 | ||
158 | if (flags & 1) | |
159 | ip_cmsg_recv_ttl(msg, skb); | |
4d52cfbe | 160 | if ((flags >>= 1) == 0) |
1da177e4 LT |
161 | return; |
162 | ||
163 | if (flags & 1) | |
164 | ip_cmsg_recv_tos(msg, skb); | |
4d52cfbe | 165 | if ((flags >>= 1) == 0) |
1da177e4 LT |
166 | return; |
167 | ||
168 | if (flags & 1) | |
169 | ip_cmsg_recv_opts(msg, skb); | |
4d52cfbe | 170 | if ((flags >>= 1) == 0) |
1da177e4 LT |
171 | return; |
172 | ||
173 | if (flags & 1) | |
174 | ip_cmsg_recv_retopts(msg, skb); | |
4d52cfbe | 175 | if ((flags >>= 1) == 0) |
2c7946a7 CZ |
176 | return; |
177 | ||
178 | if (flags & 1) | |
179 | ip_cmsg_recv_security(msg, skb); | |
e8b2dfe9 | 180 | |
4d52cfbe | 181 | if ((flags >>= 1) == 0) |
e8b2dfe9 BS |
182 | return; |
183 | if (flags & 1) | |
184 | ip_cmsg_recv_dstaddr(msg, skb); | |
185 | ||
1da177e4 | 186 | } |
4d52cfbe | 187 | EXPORT_SYMBOL(ip_cmsg_recv); |
1da177e4 | 188 | |
7a6adb92 | 189 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
1da177e4 LT |
190 | { |
191 | int err; | |
192 | struct cmsghdr *cmsg; | |
193 | ||
194 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
195 | if (!CMSG_OK(msg, cmsg)) | |
196 | return -EINVAL; | |
197 | if (cmsg->cmsg_level != SOL_IP) | |
198 | continue; | |
199 | switch (cmsg->cmsg_type) { | |
200 | case IP_RETOPTS: | |
201 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4d52cfbe ED |
202 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
203 | err < 40 ? err : 40); | |
1da177e4 LT |
204 | if (err) |
205 | return err; | |
206 | break; | |
207 | case IP_PKTINFO: | |
208 | { | |
209 | struct in_pktinfo *info; | |
210 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
211 | return -EINVAL; | |
212 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
213 | ipc->oif = info->ipi_ifindex; | |
214 | ipc->addr = info->ipi_spec_dst.s_addr; | |
215 | break; | |
216 | } | |
217 | default: | |
218 | return -EINVAL; | |
219 | } | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
224 | ||
225 | /* Special input handler for packets caught by router alert option. | |
226 | They are selected only by protocol field, and then processed likely | |
227 | local ones; but only if someone wants them! Otherwise, router | |
228 | not running rsvpd will kill RSVP. | |
229 | ||
230 | It is user level problem, what it will make with them. | |
231 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
232 | but receiver should be enough clever f.e. to forward mtrace requests, | |
233 | sent to multicast group to reach destination designated router. | |
234 | */ | |
43a951e9 | 235 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
236 | static DEFINE_SPINLOCK(ip_ra_lock); |
237 | ||
592fcb9d ED |
238 | |
239 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 240 | { |
592fcb9d ED |
241 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
242 | ||
243 | sock_put(ra->saved_sk); | |
244 | kfree(ra); | |
66018506 | 245 | } |
1da177e4 | 246 | |
4d52cfbe ED |
247 | int ip_ra_control(struct sock *sk, unsigned char on, |
248 | void (*destructor)(struct sock *)) | |
1da177e4 | 249 | { |
43a951e9 ED |
250 | struct ip_ra_chain *ra, *new_ra; |
251 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 252 | |
c720c7e8 | 253 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
254 | return -EINVAL; |
255 | ||
256 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
257 | ||
66018506 | 258 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
259 | for (rap = &ip_ra_chain; |
260 | (ra = rcu_dereference_protected(*rap, | |
261 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
262 | rap = &ra->next) { | |
1da177e4 LT |
263 | if (ra->sk == sk) { |
264 | if (on) { | |
66018506 | 265 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 266 | kfree(new_ra); |
1da177e4 LT |
267 | return -EADDRINUSE; |
268 | } | |
592fcb9d ED |
269 | /* dont let ip_call_ra_chain() use sk again */ |
270 | ra->sk = NULL; | |
66018506 ED |
271 | rcu_assign_pointer(*rap, ra->next); |
272 | spin_unlock_bh(&ip_ra_lock); | |
1da177e4 LT |
273 | |
274 | if (ra->destructor) | |
275 | ra->destructor(sk); | |
592fcb9d ED |
276 | /* |
277 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
278 | * period. This guarantee ip_call_ra_chain() dont need | |
279 | * to mess with socket refcounts. | |
280 | */ | |
281 | ra->saved_sk = sk; | |
282 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
283 | return 0; |
284 | } | |
285 | } | |
286 | if (new_ra == NULL) { | |
66018506 | 287 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
288 | return -ENOBUFS; |
289 | } | |
290 | new_ra->sk = sk; | |
291 | new_ra->destructor = destructor; | |
292 | ||
293 | new_ra->next = ra; | |
66018506 | 294 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 295 | sock_hold(sk); |
66018506 | 296 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
297 | |
298 | return 0; | |
299 | } | |
300 | ||
e905a9ed | 301 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 302 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 303 | { |
1da177e4 LT |
304 | struct sock_exterr_skb *serr; |
305 | ||
1da177e4 LT |
306 | skb = skb_clone(skb, GFP_ATOMIC); |
307 | if (!skb) | |
308 | return; | |
309 | ||
e905a9ed | 310 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
311 | serr->ee.ee_errno = err; |
312 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
313 | serr->ee.ee_type = icmp_hdr(skb)->type; |
314 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
315 | serr->ee.ee_pad = 0; |
316 | serr->ee.ee_info = info; | |
317 | serr->ee.ee_data = 0; | |
88c7664f | 318 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 319 | skb_network_header(skb); |
1da177e4 LT |
320 | serr->port = port; |
321 | ||
bd82393c ACM |
322 | if (skb_pull(skb, payload - skb->data) != NULL) { |
323 | skb_reset_transport_header(skb); | |
324 | if (sock_queue_err_skb(sk, skb) == 0) | |
325 | return; | |
326 | } | |
327 | kfree_skb(skb); | |
1da177e4 LT |
328 | } |
329 | ||
0579016e | 330 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
331 | { |
332 | struct inet_sock *inet = inet_sk(sk); | |
333 | struct sock_exterr_skb *serr; | |
334 | struct iphdr *iph; | |
335 | struct sk_buff *skb; | |
336 | ||
337 | if (!inet->recverr) | |
338 | return; | |
339 | ||
340 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
341 | if (!skb) | |
342 | return; | |
343 | ||
2ca9e6f2 ACM |
344 | skb_put(skb, sizeof(struct iphdr)); |
345 | skb_reset_network_header(skb); | |
eddc9ec5 | 346 | iph = ip_hdr(skb); |
1da177e4 LT |
347 | iph->daddr = daddr; |
348 | ||
e905a9ed | 349 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
350 | serr->ee.ee_errno = err; |
351 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 352 | serr->ee.ee_type = 0; |
1da177e4 LT |
353 | serr->ee.ee_code = 0; |
354 | serr->ee.ee_pad = 0; | |
355 | serr->ee.ee_info = info; | |
356 | serr->ee.ee_data = 0; | |
d56f90a7 | 357 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
358 | serr->port = port; |
359 | ||
27a884dc | 360 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 361 | skb_reset_transport_header(skb); |
1da177e4 LT |
362 | |
363 | if (sock_queue_err_skb(sk, skb)) | |
364 | kfree_skb(skb); | |
365 | } | |
366 | ||
e905a9ed | 367 | /* |
1da177e4 LT |
368 | * Handle MSG_ERRQUEUE |
369 | */ | |
370 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) | |
371 | { | |
372 | struct sock_exterr_skb *serr; | |
373 | struct sk_buff *skb, *skb2; | |
374 | struct sockaddr_in *sin; | |
375 | struct { | |
376 | struct sock_extended_err ee; | |
377 | struct sockaddr_in offender; | |
378 | } errhdr; | |
379 | int err; | |
380 | int copied; | |
381 | ||
382 | err = -EAGAIN; | |
383 | skb = skb_dequeue(&sk->sk_error_queue); | |
384 | if (skb == NULL) | |
385 | goto out; | |
386 | ||
387 | copied = skb->len; | |
388 | if (copied > len) { | |
389 | msg->msg_flags |= MSG_TRUNC; | |
390 | copied = len; | |
391 | } | |
392 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
393 | if (err) | |
394 | goto out_free_skb; | |
395 | ||
396 | sock_recv_timestamp(msg, sk, skb); | |
397 | ||
398 | serr = SKB_EXT_ERR(skb); | |
399 | ||
400 | sin = (struct sockaddr_in *)msg->msg_name; | |
401 | if (sin) { | |
402 | sin->sin_family = AF_INET; | |
d56f90a7 ACM |
403 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
404 | serr->addr_offset); | |
1da177e4 LT |
405 | sin->sin_port = serr->port; |
406 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
407 | } | |
408 | ||
409 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
410 | sin = &errhdr.offender; | |
411 | sin->sin_family = AF_UNSPEC; | |
412 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { | |
413 | struct inet_sock *inet = inet_sk(sk); | |
414 | ||
415 | sin->sin_family = AF_INET; | |
eddc9ec5 | 416 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
417 | sin->sin_port = 0; |
418 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
419 | if (inet->cmsg_flags) | |
420 | ip_cmsg_recv(msg, skb); | |
421 | } | |
422 | ||
423 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
424 | ||
425 | /* Now we could try to dump offended packet options */ | |
426 | ||
427 | msg->msg_flags |= MSG_ERRQUEUE; | |
428 | err = copied; | |
429 | ||
430 | /* Reset and regenerate socket error */ | |
e0f9f858 | 431 | spin_lock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 432 | sk->sk_err = 0; |
4d52cfbe ED |
433 | skb2 = skb_peek(&sk->sk_error_queue); |
434 | if (skb2 != NULL) { | |
1da177e4 | 435 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
e0f9f858 | 436 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 LT |
437 | sk->sk_error_report(sk); |
438 | } else | |
e0f9f858 | 439 | spin_unlock_bh(&sk->sk_error_queue.lock); |
1da177e4 | 440 | |
e905a9ed | 441 | out_free_skb: |
1da177e4 LT |
442 | kfree_skb(skb); |
443 | out: | |
444 | return err; | |
445 | } | |
446 | ||
447 | ||
448 | /* | |
4d52cfbe ED |
449 | * Socket option code for IP. This is the end of the line after any |
450 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
451 | */ |
452 | ||
3fdadf7d | 453 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 454 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
455 | { |
456 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 457 | int val = 0, err; |
1da177e4 | 458 | |
e905a9ed | 459 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
132adf54 SH |
460 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
461 | (1<<IP_RETOPTS) | (1<<IP_TOS) | | |
462 | (1<<IP_TTL) | (1<<IP_HDRINCL) | | |
463 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | | |
464 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | | |
d218d111 | 465 | (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) | |
7b2ff18e | 466 | (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) || |
76e21053 | 467 | optname == IP_UNICAST_IF || |
132adf54 | 468 | optname == IP_MULTICAST_TTL || |
f771bef9 | 469 | optname == IP_MULTICAST_ALL || |
e8b2dfe9 BS |
470 | optname == IP_MULTICAST_LOOP || |
471 | optname == IP_RECVORIGDSTADDR) { | |
1da177e4 LT |
472 | if (optlen >= sizeof(int)) { |
473 | if (get_user(val, (int __user *) optval)) | |
474 | return -EFAULT; | |
475 | } else if (optlen >= sizeof(char)) { | |
476 | unsigned char ucval; | |
477 | ||
478 | if (get_user(ucval, (unsigned char __user *) optval)) | |
479 | return -EFAULT; | |
480 | val = (int) ucval; | |
481 | } | |
482 | } | |
483 | ||
484 | /* If optlen==0, it is equivalent to val == 0 */ | |
485 | ||
6a9fb947 | 486 | if (ip_mroute_opt(optname)) |
09cb105e | 487 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
488 | |
489 | err = 0; | |
490 | lock_sock(sk); | |
491 | ||
492 | switch (optname) { | |
132adf54 SH |
493 | case IP_OPTIONS: |
494 | { | |
f6d8bd05 ED |
495 | struct ip_options_rcu *old, *opt = NULL; |
496 | ||
65a1c4ff | 497 | if (optlen > 40) |
132adf54 | 498 | goto e_inval; |
3b1e0a65 | 499 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 500 | optval, optlen); |
132adf54 SH |
501 | if (err) |
502 | break; | |
f6d8bd05 ED |
503 | old = rcu_dereference_protected(inet->inet_opt, |
504 | sock_owned_by_user(sk)); | |
132adf54 SH |
505 | if (inet->is_icsk) { |
506 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 507 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
508 | if (sk->sk_family == PF_INET || |
509 | (!((1 << sk->sk_state) & | |
510 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 511 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 512 | #endif |
f6d8bd05 ED |
513 | if (old) |
514 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 515 | if (opt) |
f6d8bd05 | 516 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 517 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 518 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 519 | } |
132adf54 | 520 | #endif |
1da177e4 | 521 | } |
f6d8bd05 ED |
522 | rcu_assign_pointer(inet->inet_opt, opt); |
523 | if (old) | |
605b4afe | 524 | kfree_rcu(old, rcu); |
132adf54 SH |
525 | break; |
526 | } | |
527 | case IP_PKTINFO: | |
528 | if (val) | |
529 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
530 | else | |
531 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
532 | break; | |
533 | case IP_RECVTTL: | |
534 | if (val) | |
535 | inet->cmsg_flags |= IP_CMSG_TTL; | |
536 | else | |
537 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
538 | break; | |
539 | case IP_RECVTOS: | |
540 | if (val) | |
541 | inet->cmsg_flags |= IP_CMSG_TOS; | |
542 | else | |
543 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
544 | break; | |
545 | case IP_RECVOPTS: | |
546 | if (val) | |
547 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
548 | else | |
549 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
550 | break; | |
551 | case IP_RETOPTS: | |
552 | if (val) | |
553 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
554 | else | |
555 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
556 | break; | |
557 | case IP_PASSSEC: | |
558 | if (val) | |
559 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
560 | else | |
561 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
562 | break; | |
e8b2dfe9 BS |
563 | case IP_RECVORIGDSTADDR: |
564 | if (val) | |
565 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
566 | else | |
567 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
568 | break; | |
132adf54 SH |
569 | case IP_TOS: /* This sets both TOS and Precedence */ |
570 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
571 | val &= ~INET_ECN_MASK; |
572 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 573 | } |
132adf54 SH |
574 | if (inet->tos != val) { |
575 | inet->tos = val; | |
576 | sk->sk_priority = rt_tos2priority(val); | |
577 | sk_dst_reset(sk); | |
578 | } | |
579 | break; | |
580 | case IP_TTL: | |
4d52cfbe | 581 | if (optlen < 1) |
132adf54 | 582 | goto e_inval; |
4d52cfbe | 583 | if (val != -1 && (val < 0 || val > 255)) |
132adf54 SH |
584 | goto e_inval; |
585 | inet->uc_ttl = val; | |
586 | break; | |
587 | case IP_HDRINCL: | |
588 | if (sk->sk_type != SOCK_RAW) { | |
589 | err = -ENOPROTOOPT; | |
2c7946a7 | 590 | break; |
132adf54 SH |
591 | } |
592 | inet->hdrincl = val ? 1 : 0; | |
593 | break; | |
7b2ff18e JO |
594 | case IP_NODEFRAG: |
595 | if (sk->sk_type != SOCK_RAW) { | |
596 | err = -ENOPROTOOPT; | |
597 | break; | |
598 | } | |
599 | inet->nodefrag = val ? 1 : 0; | |
600 | break; | |
132adf54 | 601 | case IP_MTU_DISCOVER: |
0eae750e | 602 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
132adf54 SH |
603 | goto e_inval; |
604 | inet->pmtudisc = val; | |
605 | break; | |
606 | case IP_RECVERR: | |
607 | inet->recverr = !!val; | |
608 | if (!val) | |
609 | skb_queue_purge(&sk->sk_error_queue); | |
610 | break; | |
611 | case IP_MULTICAST_TTL: | |
612 | if (sk->sk_type == SOCK_STREAM) | |
613 | goto e_inval; | |
4d52cfbe | 614 | if (optlen < 1) |
132adf54 | 615 | goto e_inval; |
09cb105e | 616 | if (val == -1) |
132adf54 SH |
617 | val = 1; |
618 | if (val < 0 || val > 255) | |
619 | goto e_inval; | |
620 | inet->mc_ttl = val; | |
621 | break; | |
622 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 623 | if (optlen < 1) |
132adf54 SH |
624 | goto e_inval; |
625 | inet->mc_loop = !!val; | |
626 | break; | |
76e21053 EH |
627 | case IP_UNICAST_IF: |
628 | { | |
629 | struct net_device *dev = NULL; | |
630 | int ifindex; | |
631 | ||
632 | if (optlen != sizeof(int)) | |
633 | goto e_inval; | |
634 | ||
635 | ifindex = (__force int)ntohl((__force __be32)val); | |
636 | if (ifindex == 0) { | |
637 | inet->uc_index = 0; | |
638 | err = 0; | |
639 | break; | |
640 | } | |
641 | ||
642 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
643 | err = -EADDRNOTAVAIL; | |
644 | if (!dev) | |
645 | break; | |
646 | dev_put(dev); | |
647 | ||
648 | err = -EINVAL; | |
649 | if (sk->sk_bound_dev_if) | |
650 | break; | |
651 | ||
652 | inet->uc_index = ifindex; | |
653 | err = 0; | |
654 | break; | |
655 | } | |
132adf54 SH |
656 | case IP_MULTICAST_IF: |
657 | { | |
658 | struct ip_mreqn mreq; | |
659 | struct net_device *dev = NULL; | |
660 | ||
661 | if (sk->sk_type == SOCK_STREAM) | |
662 | goto e_inval; | |
663 | /* | |
664 | * Check the arguments are allowable | |
665 | */ | |
666 | ||
0915921b SW |
667 | if (optlen < sizeof(struct in_addr)) |
668 | goto e_inval; | |
669 | ||
132adf54 SH |
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)); | |
676 | if (optlen >= sizeof(struct in_addr) && | |
4d52cfbe ED |
677 | copy_from_user(&mreq.imr_address, optval, |
678 | sizeof(struct in_addr))) | |
132adf54 SH |
679 | break; |
680 | } | |
681 | ||
682 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 683 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
684 | inet->mc_index = 0; |
685 | inet->mc_addr = 0; | |
686 | err = 0; | |
1da177e4 LT |
687 | break; |
688 | } | |
3b1e0a65 | 689 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 690 | if (dev) |
132adf54 | 691 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 692 | } else |
55b80503 | 693 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 694 | |
1da177e4 | 695 | |
132adf54 SH |
696 | err = -EADDRNOTAVAIL; |
697 | if (!dev) | |
698 | break; | |
55b80503 | 699 | dev_put(dev); |
132adf54 SH |
700 | |
701 | err = -EINVAL; | |
702 | if (sk->sk_bound_dev_if && | |
703 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
704 | break; | |
1da177e4 | 705 | |
132adf54 SH |
706 | inet->mc_index = mreq.imr_ifindex; |
707 | inet->mc_addr = mreq.imr_address.s_addr; | |
708 | err = 0; | |
709 | break; | |
710 | } | |
1da177e4 | 711 | |
132adf54 SH |
712 | case IP_ADD_MEMBERSHIP: |
713 | case IP_DROP_MEMBERSHIP: | |
714 | { | |
715 | struct ip_mreqn mreq; | |
1da177e4 | 716 | |
a96fb49b FL |
717 | err = -EPROTO; |
718 | if (inet_sk(sk)->is_icsk) | |
719 | break; | |
720 | ||
132adf54 SH |
721 | if (optlen < sizeof(struct ip_mreq)) |
722 | goto e_inval; | |
723 | err = -EFAULT; | |
724 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 725 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 726 | break; |
132adf54 SH |
727 | } else { |
728 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 729 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 730 | break; |
132adf54 | 731 | } |
1da177e4 | 732 | |
132adf54 SH |
733 | if (optname == IP_ADD_MEMBERSHIP) |
734 | err = ip_mc_join_group(sk, &mreq); | |
735 | else | |
736 | err = ip_mc_leave_group(sk, &mreq); | |
737 | break; | |
738 | } | |
739 | case IP_MSFILTER: | |
740 | { | |
132adf54 SH |
741 | struct ip_msfilter *msf; |
742 | ||
743 | if (optlen < IP_MSFILTER_SIZE(0)) | |
744 | goto e_inval; | |
745 | if (optlen > sysctl_optmem_max) { | |
746 | err = -ENOBUFS; | |
1da177e4 LT |
747 | break; |
748 | } | |
132adf54 | 749 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 750 | if (!msf) { |
132adf54 SH |
751 | err = -ENOBUFS; |
752 | break; | |
753 | } | |
754 | err = -EFAULT; | |
755 | if (copy_from_user(msf, optval, optlen)) { | |
756 | kfree(msf); | |
757 | break; | |
758 | } | |
759 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
760 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
761 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
762 | kfree(msf); | |
763 | err = -ENOBUFS; | |
764 | break; | |
765 | } | |
766 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
767 | kfree(msf); | |
768 | err = -EINVAL; | |
769 | break; | |
770 | } | |
771 | err = ip_mc_msfilter(sk, msf, 0); | |
772 | kfree(msf); | |
773 | break; | |
774 | } | |
775 | case IP_BLOCK_SOURCE: | |
776 | case IP_UNBLOCK_SOURCE: | |
777 | case IP_ADD_SOURCE_MEMBERSHIP: | |
778 | case IP_DROP_SOURCE_MEMBERSHIP: | |
779 | { | |
780 | struct ip_mreq_source mreqs; | |
781 | int omode, add; | |
1da177e4 | 782 | |
132adf54 SH |
783 | if (optlen != sizeof(struct ip_mreq_source)) |
784 | goto e_inval; | |
785 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 786 | err = -EFAULT; |
1da177e4 LT |
787 | break; |
788 | } | |
132adf54 SH |
789 | if (optname == IP_BLOCK_SOURCE) { |
790 | omode = MCAST_EXCLUDE; | |
791 | add = 1; | |
792 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
793 | omode = MCAST_EXCLUDE; | |
794 | add = 0; | |
795 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
796 | struct ip_mreqn mreq; | |
1da177e4 | 797 | |
132adf54 SH |
798 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
799 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
800 | mreq.imr_ifindex = 0; | |
801 | err = ip_mc_join_group(sk, &mreq); | |
802 | if (err && err != -EADDRINUSE) | |
1da177e4 | 803 | break; |
132adf54 SH |
804 | omode = MCAST_INCLUDE; |
805 | add = 1; | |
806 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
807 | omode = MCAST_INCLUDE; | |
808 | add = 0; | |
809 | } | |
810 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
811 | break; | |
812 | } | |
813 | case MCAST_JOIN_GROUP: | |
814 | case MCAST_LEAVE_GROUP: | |
815 | { | |
816 | struct group_req greq; | |
817 | struct sockaddr_in *psin; | |
818 | struct ip_mreqn mreq; | |
819 | ||
820 | if (optlen < sizeof(struct group_req)) | |
821 | goto e_inval; | |
822 | err = -EFAULT; | |
823 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
824 | break; | |
825 | psin = (struct sockaddr_in *)&greq.gr_group; | |
826 | if (psin->sin_family != AF_INET) | |
827 | goto e_inval; | |
828 | memset(&mreq, 0, sizeof(mreq)); | |
829 | mreq.imr_multiaddr = psin->sin_addr; | |
830 | mreq.imr_ifindex = greq.gr_interface; | |
831 | ||
832 | if (optname == MCAST_JOIN_GROUP) | |
833 | err = ip_mc_join_group(sk, &mreq); | |
834 | else | |
835 | err = ip_mc_leave_group(sk, &mreq); | |
836 | break; | |
837 | } | |
838 | case MCAST_JOIN_SOURCE_GROUP: | |
839 | case MCAST_LEAVE_SOURCE_GROUP: | |
840 | case MCAST_BLOCK_SOURCE: | |
841 | case MCAST_UNBLOCK_SOURCE: | |
842 | { | |
843 | struct group_source_req greqs; | |
844 | struct ip_mreq_source mreqs; | |
845 | struct sockaddr_in *psin; | |
846 | int omode, add; | |
847 | ||
848 | if (optlen != sizeof(struct group_source_req)) | |
849 | goto e_inval; | |
850 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 851 | err = -EFAULT; |
1da177e4 LT |
852 | break; |
853 | } | |
132adf54 SH |
854 | if (greqs.gsr_group.ss_family != AF_INET || |
855 | greqs.gsr_source.ss_family != AF_INET) { | |
856 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
857 | break; |
858 | } | |
132adf54 SH |
859 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
860 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
861 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
862 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
863 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
864 | ||
865 | if (optname == MCAST_BLOCK_SOURCE) { | |
866 | omode = MCAST_EXCLUDE; | |
867 | add = 1; | |
868 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
869 | omode = MCAST_EXCLUDE; | |
870 | add = 0; | |
871 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
872 | struct ip_mreqn mreq; |
873 | ||
132adf54 | 874 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 875 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
876 | mreq.imr_address.s_addr = 0; |
877 | mreq.imr_ifindex = greqs.gsr_interface; | |
878 | err = ip_mc_join_group(sk, &mreq); | |
879 | if (err && err != -EADDRINUSE) | |
880 | break; | |
881 | greqs.gsr_interface = mreq.imr_ifindex; | |
882 | omode = MCAST_INCLUDE; | |
883 | add = 1; | |
884 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
885 | omode = MCAST_INCLUDE; | |
886 | add = 0; | |
887 | } | |
888 | err = ip_mc_source(add, omode, sk, &mreqs, | |
889 | greqs.gsr_interface); | |
890 | break; | |
891 | } | |
892 | case MCAST_MSFILTER: | |
893 | { | |
132adf54 SH |
894 | struct sockaddr_in *psin; |
895 | struct ip_msfilter *msf = NULL; | |
896 | struct group_filter *gsf = NULL; | |
897 | int msize, i, ifindex; | |
898 | ||
899 | if (optlen < GROUP_FILTER_SIZE(0)) | |
900 | goto e_inval; | |
901 | if (optlen > sysctl_optmem_max) { | |
902 | err = -ENOBUFS; | |
1da177e4 LT |
903 | break; |
904 | } | |
09cb105e | 905 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 906 | if (!gsf) { |
132adf54 | 907 | err = -ENOBUFS; |
1da177e4 LT |
908 | break; |
909 | } | |
132adf54 | 910 | err = -EFAULT; |
4d52cfbe | 911 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 912 | goto mc_msf_out; |
4d52cfbe | 913 | |
132adf54 SH |
914 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
915 | if (gsf->gf_numsrc >= 0x1ffffff || | |
916 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
917 | err = -ENOBUFS; | |
918 | goto mc_msf_out; | |
919 | } | |
920 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
921 | err = -EINVAL; | |
922 | goto mc_msf_out; | |
923 | } | |
924 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 925 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 926 | if (!msf) { |
132adf54 SH |
927 | err = -ENOBUFS; |
928 | goto mc_msf_out; | |
929 | } | |
930 | ifindex = gsf->gf_interface; | |
931 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
932 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 933 | err = -EADDRNOTAVAIL; |
132adf54 | 934 | goto mc_msf_out; |
1da177e4 | 935 | } |
132adf54 SH |
936 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
937 | msf->imsf_interface = 0; | |
938 | msf->imsf_fmode = gsf->gf_fmode; | |
939 | msf->imsf_numsrc = gsf->gf_numsrc; | |
940 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 941 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 942 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 943 | |
132adf54 SH |
944 | if (psin->sin_family != AF_INET) |
945 | goto mc_msf_out; | |
946 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
947 | } | |
948 | kfree(gsf); | |
949 | gsf = NULL; | |
950 | ||
951 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 952 | mc_msf_out: |
132adf54 SH |
953 | kfree(msf); |
954 | kfree(gsf); | |
955 | break; | |
956 | } | |
f771bef9 NS |
957 | case IP_MULTICAST_ALL: |
958 | if (optlen < 1) | |
959 | goto e_inval; | |
960 | if (val != 0 && val != 1) | |
961 | goto e_inval; | |
962 | inet->mc_all = val; | |
963 | break; | |
132adf54 SH |
964 | case IP_ROUTER_ALERT: |
965 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
966 | break; | |
967 | ||
968 | case IP_FREEBIND: | |
4d52cfbe | 969 | if (optlen < 1) |
132adf54 SH |
970 | goto e_inval; |
971 | inet->freebind = !!val; | |
972 | break; | |
973 | ||
974 | case IP_IPSEC_POLICY: | |
975 | case IP_XFRM_POLICY: | |
976 | err = -EPERM; | |
977 | if (!capable(CAP_NET_ADMIN)) | |
1da177e4 | 978 | break; |
132adf54 SH |
979 | err = xfrm_user_policy(sk, optname, optval, optlen); |
980 | break; | |
1da177e4 | 981 | |
f5715aea | 982 | case IP_TRANSPARENT: |
6cc7a765 | 983 | if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) { |
f5715aea KK |
984 | err = -EPERM; |
985 | break; | |
986 | } | |
987 | if (optlen < 1) | |
988 | goto e_inval; | |
989 | inet->transparent = !!val; | |
990 | break; | |
991 | ||
d218d111 SH |
992 | case IP_MINTTL: |
993 | if (optlen < 1) | |
994 | goto e_inval; | |
995 | if (val < 0 || val > 255) | |
996 | goto e_inval; | |
997 | inet->min_ttl = val; | |
998 | break; | |
999 | ||
132adf54 SH |
1000 | default: |
1001 | err = -ENOPROTOOPT; | |
1002 | break; | |
1da177e4 LT |
1003 | } |
1004 | release_sock(sk); | |
1005 | return err; | |
1006 | ||
1007 | e_inval: | |
1008 | release_sock(sk); | |
1009 | return -EINVAL; | |
1010 | } | |
1011 | ||
f84af32c | 1012 | /** |
d826eb14 | 1013 | * ipv4_pktinfo_prepare - transfert some info from rtable to skb |
f84af32c ED |
1014 | * @sk: socket |
1015 | * @skb: buffer | |
1016 | * | |
d826eb14 ED |
1017 | * To support IP_CMSG_PKTINFO option, we store rt_iif and rt_spec_dst |
1018 | * in skb->cb[] before dst drop. | |
1019 | * This way, receiver doesnt make cache line misses to read rtable. | |
f84af32c | 1020 | */ |
d826eb14 | 1021 | void ipv4_pktinfo_prepare(struct sk_buff *skb) |
f84af32c | 1022 | { |
d826eb14 ED |
1023 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
1024 | const struct rtable *rt = skb_rtable(skb); | |
1025 | ||
1026 | if (rt) { | |
1027 | pktinfo->ipi_ifindex = rt->rt_iif; | |
1028 | pktinfo->ipi_spec_dst.s_addr = rt->rt_spec_dst; | |
1029 | } else { | |
1030 | pktinfo->ipi_ifindex = 0; | |
1031 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1032 | } | |
1033 | skb_dst_drop(skb); | |
f84af32c | 1034 | } |
f84af32c | 1035 | |
3fdadf7d | 1036 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1037 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1038 | { |
1039 | int err; | |
1040 | ||
1041 | if (level != SOL_IP) | |
1042 | return -ENOPROTOOPT; | |
1043 | ||
1044 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1045 | #ifdef CONFIG_NETFILTER | |
1046 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1047 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1048 | optname != IP_IPSEC_POLICY && |
1049 | optname != IP_XFRM_POLICY && | |
1050 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1051 | lock_sock(sk); |
1052 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1053 | release_sock(sk); | |
1054 | } | |
1055 | #endif | |
1056 | return err; | |
1057 | } | |
4d52cfbe | 1058 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1059 | |
1060 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1061 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1062 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1063 | { |
1064 | int err; | |
1065 | ||
1066 | if (level != SOL_IP) | |
1067 | return -ENOPROTOOPT; | |
1068 | ||
dae50295 DS |
1069 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1070 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1071 | ip_setsockopt); | |
1072 | ||
3fdadf7d DM |
1073 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1074 | #ifdef CONFIG_NETFILTER | |
1075 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1076 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1077 | optname != IP_IPSEC_POLICY && |
1078 | optname != IP_XFRM_POLICY && | |
1079 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1080 | lock_sock(sk); |
543d9cfe ACM |
1081 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1082 | optval, optlen); | |
3fdadf7d DM |
1083 | release_sock(sk); |
1084 | } | |
1085 | #endif | |
1086 | return err; | |
1087 | } | |
543d9cfe | 1088 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1089 | #endif |
1090 | ||
1da177e4 | 1091 | /* |
4d52cfbe ED |
1092 | * Get the options. Note for future reference. The GET of IP options gets |
1093 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1094 | */ |
1095 | ||
3fdadf7d | 1096 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1097 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1098 | { |
1099 | struct inet_sock *inet = inet_sk(sk); | |
1100 | int val; | |
1101 | int len; | |
e905a9ed | 1102 | |
132adf54 | 1103 | if (level != SOL_IP) |
1da177e4 LT |
1104 | return -EOPNOTSUPP; |
1105 | ||
6a9fb947 | 1106 | if (ip_mroute_opt(optname)) |
09cb105e | 1107 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1108 | |
09cb105e | 1109 | if (get_user(len, optlen)) |
1da177e4 | 1110 | return -EFAULT; |
132adf54 | 1111 | if (len < 0) |
1da177e4 | 1112 | return -EINVAL; |
e905a9ed | 1113 | |
1da177e4 LT |
1114 | lock_sock(sk); |
1115 | ||
132adf54 SH |
1116 | switch (optname) { |
1117 | case IP_OPTIONS: | |
1118 | { | |
1119 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1120 | struct ip_options *opt = (struct ip_options *)optbuf; |
1121 | struct ip_options_rcu *inet_opt; | |
1122 | ||
1123 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1124 | sock_owned_by_user(sk)); | |
132adf54 | 1125 | opt->optlen = 0; |
f6d8bd05 ED |
1126 | if (inet_opt) |
1127 | memcpy(optbuf, &inet_opt->opt, | |
1128 | sizeof(struct ip_options) + | |
1129 | inet_opt->opt.optlen); | |
132adf54 SH |
1130 | release_sock(sk); |
1131 | ||
1132 | if (opt->optlen == 0) | |
1133 | return put_user(0, optlen); | |
1134 | ||
1135 | ip_options_undo(opt); | |
1136 | ||
1137 | len = min_t(unsigned int, len, opt->optlen); | |
1138 | if (put_user(len, optlen)) | |
1139 | return -EFAULT; | |
1140 | if (copy_to_user(optval, opt->__data, len)) | |
1141 | return -EFAULT; | |
1142 | return 0; | |
1143 | } | |
1144 | case IP_PKTINFO: | |
1145 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1146 | break; | |
1147 | case IP_RECVTTL: | |
1148 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1149 | break; | |
1150 | case IP_RECVTOS: | |
1151 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1152 | break; | |
1153 | case IP_RECVOPTS: | |
1154 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1155 | break; | |
1156 | case IP_RETOPTS: | |
1157 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1158 | break; | |
1159 | case IP_PASSSEC: | |
1160 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1161 | break; | |
e8b2dfe9 BS |
1162 | case IP_RECVORIGDSTADDR: |
1163 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1164 | break; | |
132adf54 SH |
1165 | case IP_TOS: |
1166 | val = inet->tos; | |
1167 | break; | |
1168 | case IP_TTL: | |
1169 | val = (inet->uc_ttl == -1 ? | |
1170 | sysctl_ip_default_ttl : | |
1171 | inet->uc_ttl); | |
1172 | break; | |
1173 | case IP_HDRINCL: | |
1174 | val = inet->hdrincl; | |
1175 | break; | |
a89b4763 MK |
1176 | case IP_NODEFRAG: |
1177 | val = inet->nodefrag; | |
1178 | break; | |
132adf54 SH |
1179 | case IP_MTU_DISCOVER: |
1180 | val = inet->pmtudisc; | |
1181 | break; | |
1182 | case IP_MTU: | |
1183 | { | |
1184 | struct dst_entry *dst; | |
1185 | val = 0; | |
1186 | dst = sk_dst_get(sk); | |
1187 | if (dst) { | |
1188 | val = dst_mtu(dst); | |
1189 | dst_release(dst); | |
1da177e4 | 1190 | } |
132adf54 | 1191 | if (!val) { |
1da177e4 | 1192 | release_sock(sk); |
132adf54 | 1193 | return -ENOTCONN; |
1da177e4 | 1194 | } |
132adf54 SH |
1195 | break; |
1196 | } | |
1197 | case IP_RECVERR: | |
1198 | val = inet->recverr; | |
1199 | break; | |
1200 | case IP_MULTICAST_TTL: | |
1201 | val = inet->mc_ttl; | |
1202 | break; | |
1203 | case IP_MULTICAST_LOOP: | |
1204 | val = inet->mc_loop; | |
1205 | break; | |
76e21053 EH |
1206 | case IP_UNICAST_IF: |
1207 | val = (__force int)htonl((__u32) inet->uc_index); | |
1208 | break; | |
132adf54 SH |
1209 | case IP_MULTICAST_IF: |
1210 | { | |
1211 | struct in_addr addr; | |
1212 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1213 | addr.s_addr = inet->mc_addr; | |
1214 | release_sock(sk); | |
1da177e4 | 1215 | |
132adf54 SH |
1216 | if (put_user(len, optlen)) |
1217 | return -EFAULT; | |
1218 | if (copy_to_user(optval, &addr, len)) | |
1219 | return -EFAULT; | |
1220 | return 0; | |
1221 | } | |
1222 | case IP_MSFILTER: | |
1223 | { | |
1224 | struct ip_msfilter msf; | |
1225 | int err; | |
1226 | ||
1227 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1228 | release_sock(sk); |
132adf54 | 1229 | return -EINVAL; |
1da177e4 | 1230 | } |
132adf54 | 1231 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1232 | release_sock(sk); |
132adf54 | 1233 | return -EFAULT; |
1da177e4 | 1234 | } |
132adf54 SH |
1235 | err = ip_mc_msfget(sk, &msf, |
1236 | (struct ip_msfilter __user *)optval, optlen); | |
1237 | release_sock(sk); | |
1238 | return err; | |
1239 | } | |
1240 | case MCAST_MSFILTER: | |
1241 | { | |
1242 | struct group_filter gsf; | |
1243 | int err; | |
1da177e4 | 1244 | |
132adf54 | 1245 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1246 | release_sock(sk); |
132adf54 SH |
1247 | return -EINVAL; |
1248 | } | |
1249 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1250 | release_sock(sk); | |
1251 | return -EFAULT; | |
1252 | } | |
1253 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1254 | (struct group_filter __user *)optval, |
1255 | optlen); | |
132adf54 SH |
1256 | release_sock(sk); |
1257 | return err; | |
1258 | } | |
f771bef9 NS |
1259 | case IP_MULTICAST_ALL: |
1260 | val = inet->mc_all; | |
1261 | break; | |
132adf54 SH |
1262 | case IP_PKTOPTIONS: |
1263 | { | |
1264 | struct msghdr msg; | |
1da177e4 | 1265 | |
132adf54 | 1266 | release_sock(sk); |
1da177e4 | 1267 | |
132adf54 SH |
1268 | if (sk->sk_type != SOCK_STREAM) |
1269 | return -ENOPROTOOPT; | |
1da177e4 | 1270 | |
132adf54 SH |
1271 | msg.msg_control = optval; |
1272 | msg.msg_controllen = len; | |
dd23198e | 1273 | msg.msg_flags = flags; |
1da177e4 | 1274 | |
132adf54 SH |
1275 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1276 | struct in_pktinfo info; | |
1277 | ||
c720c7e8 ED |
1278 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1279 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1280 | info.ipi_ifindex = inet->mc_index; |
1281 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1282 | } |
132adf54 SH |
1283 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1284 | int hlim = inet->mc_ttl; | |
1285 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1286 | } | |
4c507d28 JB |
1287 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1288 | int tos = inet->rcv_tos; | |
1289 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1290 | } | |
132adf54 SH |
1291 | len -= msg.msg_controllen; |
1292 | return put_user(len, optlen); | |
1293 | } | |
1294 | case IP_FREEBIND: | |
1295 | val = inet->freebind; | |
1296 | break; | |
f5715aea KK |
1297 | case IP_TRANSPARENT: |
1298 | val = inet->transparent; | |
1299 | break; | |
d218d111 SH |
1300 | case IP_MINTTL: |
1301 | val = inet->min_ttl; | |
1302 | break; | |
132adf54 SH |
1303 | default: |
1304 | release_sock(sk); | |
1305 | return -ENOPROTOOPT; | |
1da177e4 LT |
1306 | } |
1307 | release_sock(sk); | |
e905a9ed | 1308 | |
4d52cfbe | 1309 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1310 | unsigned char ucval = (unsigned char)val; |
1311 | len = 1; | |
132adf54 | 1312 | if (put_user(len, optlen)) |
1da177e4 | 1313 | return -EFAULT; |
09cb105e | 1314 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1315 | return -EFAULT; |
1316 | } else { | |
1317 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1318 | if (put_user(len, optlen)) |
1da177e4 | 1319 | return -EFAULT; |
09cb105e | 1320 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1321 | return -EFAULT; |
1322 | } | |
1323 | return 0; | |
1324 | } | |
1325 | ||
3fdadf7d | 1326 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1327 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1328 | { |
1329 | int err; | |
1330 | ||
dd23198e | 1331 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1332 | #ifdef CONFIG_NETFILTER |
1333 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1334 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1335 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1336 | int len; |
3fdadf7d | 1337 | |
09cb105e | 1338 | if (get_user(len, optlen)) |
3fdadf7d DM |
1339 | return -EFAULT; |
1340 | ||
1341 | lock_sock(sk); | |
1342 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1343 | &len); | |
1344 | release_sock(sk); | |
1345 | if (err >= 0) | |
1346 | err = put_user(len, optlen); | |
1347 | return err; | |
1348 | } | |
1349 | #endif | |
1350 | return err; | |
1351 | } | |
4d52cfbe | 1352 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1353 | |
1354 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1355 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1356 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1357 | { |
42908c69 DS |
1358 | int err; |
1359 | ||
1360 | if (optname == MCAST_MSFILTER) | |
1361 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1362 | ip_getsockopt); | |
1363 | ||
dd23198e DB |
1364 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1365 | MSG_CMSG_COMPAT); | |
42908c69 | 1366 | |
3fdadf7d DM |
1367 | #ifdef CONFIG_NETFILTER |
1368 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1369 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1370 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1371 | int len; |
3fdadf7d | 1372 | |
543d9cfe | 1373 | if (get_user(len, optlen)) |
3fdadf7d DM |
1374 | return -EFAULT; |
1375 | ||
1376 | lock_sock(sk); | |
543d9cfe | 1377 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1378 | release_sock(sk); |
1379 | if (err >= 0) | |
1380 | err = put_user(len, optlen); | |
1381 | return err; | |
1382 | } | |
1383 | #endif | |
1384 | return err; | |
1385 | } | |
543d9cfe | 1386 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1387 | #endif |