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 | |
35ebf65e | 43 | #include <net/ip_fib.h> |
1da177e4 LT |
44 | |
45 | #include <linux/errqueue.h> | |
46 | #include <asm/uaccess.h> | |
47 | ||
1da177e4 LT |
48 | /* |
49 | * SOL_IP control messages. | |
50 | */ | |
51 | ||
52 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
53 | { | |
d826eb14 | 54 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 55 | |
eddc9ec5 | 56 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
57 | |
58 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
59 | } | |
60 | ||
61 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
62 | { | |
eddc9ec5 | 63 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
64 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
65 | } | |
66 | ||
67 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
68 | { | |
eddc9ec5 | 69 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
70 | } |
71 | ||
72 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
73 | { | |
74 | if (IPCB(skb)->opt.optlen == 0) | |
75 | return; | |
76 | ||
eddc9ec5 ACM |
77 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
78 | ip_hdr(skb) + 1); | |
1da177e4 LT |
79 | } |
80 | ||
81 | ||
82 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
83 | { | |
84 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 85 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
86 | |
87 | if (IPCB(skb)->opt.optlen == 0) | |
88 | return; | |
89 | ||
90 | if (ip_options_echo(opt, skb)) { | |
91 | msg->msg_flags |= MSG_CTRUNC; | |
92 | return; | |
93 | } | |
94 | ip_options_undo(opt); | |
95 | ||
96 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
97 | } | |
98 | ||
2c7946a7 CZ |
99 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
100 | { | |
101 | char *secdata; | |
dc49c1f9 | 102 | u32 seclen, secid; |
2c7946a7 CZ |
103 | int err; |
104 | ||
dc49c1f9 CZ |
105 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
106 | if (err) | |
107 | return; | |
108 | ||
109 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
110 | if (err) |
111 | return; | |
112 | ||
113 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 114 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
115 | } |
116 | ||
21d1a161 | 117 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
118 | { |
119 | struct sockaddr_in sin; | |
b71d1d42 | 120 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 121 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
122 | |
123 | if (skb_transport_offset(skb) + 4 > skb->len) | |
124 | return; | |
125 | ||
126 | /* All current transport protocols have the port numbers in the | |
127 | * first four bytes of the transport header and this function is | |
128 | * written with this assumption in mind. | |
129 | */ | |
130 | ||
131 | sin.sin_family = AF_INET; | |
132 | sin.sin_addr.s_addr = iph->daddr; | |
133 | sin.sin_port = ports[1]; | |
134 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
135 | ||
136 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
137 | } | |
1da177e4 | 138 | |
5961de9f TH |
139 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, |
140 | int offset) | |
1da177e4 LT |
141 | { |
142 | struct inet_sock *inet = inet_sk(skb->sk); | |
95c96174 | 143 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
144 | |
145 | /* Ordered by supposed usage frequency */ | |
c44d13d6 | 146 | if (flags & IP_CMSG_PKTINFO) { |
1da177e4 | 147 | ip_cmsg_recv_pktinfo(msg, skb); |
1da177e4 | 148 | |
c44d13d6 TH |
149 | flags &= ~IP_CMSG_PKTINFO; |
150 | if (!flags) | |
151 | return; | |
152 | } | |
153 | ||
154 | if (flags & IP_CMSG_TTL) { | |
1da177e4 | 155 | ip_cmsg_recv_ttl(msg, skb); |
1da177e4 | 156 | |
c44d13d6 TH |
157 | flags &= ~IP_CMSG_TTL; |
158 | if (!flags) | |
159 | return; | |
160 | } | |
161 | ||
162 | if (flags & IP_CMSG_TOS) { | |
1da177e4 | 163 | ip_cmsg_recv_tos(msg, skb); |
1da177e4 | 164 | |
c44d13d6 TH |
165 | flags &= ~IP_CMSG_TOS; |
166 | if (!flags) | |
167 | return; | |
168 | } | |
169 | ||
170 | if (flags & IP_CMSG_RECVOPTS) { | |
1da177e4 | 171 | ip_cmsg_recv_opts(msg, skb); |
1da177e4 | 172 | |
c44d13d6 TH |
173 | flags &= ~IP_CMSG_RECVOPTS; |
174 | if (!flags) | |
175 | return; | |
176 | } | |
177 | ||
178 | if (flags & IP_CMSG_RETOPTS) { | |
1da177e4 | 179 | ip_cmsg_recv_retopts(msg, skb); |
2c7946a7 | 180 | |
c44d13d6 TH |
181 | flags &= ~IP_CMSG_RETOPTS; |
182 | if (!flags) | |
183 | return; | |
184 | } | |
185 | ||
186 | if (flags & IP_CMSG_PASSSEC) { | |
2c7946a7 | 187 | ip_cmsg_recv_security(msg, skb); |
e8b2dfe9 | 188 | |
c44d13d6 TH |
189 | flags &= ~IP_CMSG_PASSSEC; |
190 | if (!flags) | |
191 | return; | |
192 | } | |
193 | ||
194 | if (flags & IP_CMSG_ORIGDSTADDR) | |
e8b2dfe9 BS |
195 | ip_cmsg_recv_dstaddr(msg, skb); |
196 | ||
1da177e4 | 197 | } |
5961de9f | 198 | EXPORT_SYMBOL(ip_cmsg_recv_offset); |
1da177e4 | 199 | |
c8e6ad08 HFS |
200 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, |
201 | bool allow_ipv6) | |
1da177e4 | 202 | { |
f02db315 | 203 | int err, val; |
1da177e4 LT |
204 | struct cmsghdr *cmsg; |
205 | ||
f95b414e | 206 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
207 | if (!CMSG_OK(msg, cmsg)) |
208 | return -EINVAL; | |
5337b5b7 | 209 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
210 | if (allow_ipv6 && |
211 | cmsg->cmsg_level == SOL_IPV6 && | |
212 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
213 | struct in6_pktinfo *src_info; | |
214 | ||
215 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
216 | return -EINVAL; | |
217 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
218 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
219 | return -EINVAL; | |
220 | ipc->oif = src_info->ipi6_ifindex; | |
221 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; | |
222 | continue; | |
223 | } | |
224 | #endif | |
1da177e4 LT |
225 | if (cmsg->cmsg_level != SOL_IP) |
226 | continue; | |
227 | switch (cmsg->cmsg_type) { | |
228 | case IP_RETOPTS: | |
229 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4d52cfbe ED |
230 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
231 | err < 40 ? err : 40); | |
1da177e4 LT |
232 | if (err) |
233 | return err; | |
234 | break; | |
235 | case IP_PKTINFO: | |
236 | { | |
237 | struct in_pktinfo *info; | |
238 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
239 | return -EINVAL; | |
240 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
241 | ipc->oif = info->ipi_ifindex; | |
242 | ipc->addr = info->ipi_spec_dst.s_addr; | |
243 | break; | |
244 | } | |
f02db315 FF |
245 | case IP_TTL: |
246 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
247 | return -EINVAL; | |
248 | val = *(int *)CMSG_DATA(cmsg); | |
249 | if (val < 1 || val > 255) | |
250 | return -EINVAL; | |
251 | ipc->ttl = val; | |
252 | break; | |
253 | case IP_TOS: | |
254 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
255 | return -EINVAL; | |
256 | val = *(int *)CMSG_DATA(cmsg); | |
257 | if (val < 0 || val > 255) | |
258 | return -EINVAL; | |
259 | ipc->tos = val; | |
260 | ipc->priority = rt_tos2priority(ipc->tos); | |
261 | break; | |
262 | ||
1da177e4 LT |
263 | default: |
264 | return -EINVAL; | |
265 | } | |
266 | } | |
267 | return 0; | |
268 | } | |
269 | ||
270 | ||
271 | /* Special input handler for packets caught by router alert option. | |
272 | They are selected only by protocol field, and then processed likely | |
273 | local ones; but only if someone wants them! Otherwise, router | |
274 | not running rsvpd will kill RSVP. | |
275 | ||
276 | It is user level problem, what it will make with them. | |
277 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
278 | but receiver should be enough clever f.e. to forward mtrace requests, | |
279 | sent to multicast group to reach destination designated router. | |
280 | */ | |
43a951e9 | 281 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
282 | static DEFINE_SPINLOCK(ip_ra_lock); |
283 | ||
592fcb9d ED |
284 | |
285 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 286 | { |
592fcb9d ED |
287 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
288 | ||
289 | sock_put(ra->saved_sk); | |
290 | kfree(ra); | |
66018506 | 291 | } |
1da177e4 | 292 | |
4d52cfbe ED |
293 | int ip_ra_control(struct sock *sk, unsigned char on, |
294 | void (*destructor)(struct sock *)) | |
1da177e4 | 295 | { |
43a951e9 ED |
296 | struct ip_ra_chain *ra, *new_ra; |
297 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 298 | |
c720c7e8 | 299 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
300 | return -EINVAL; |
301 | ||
302 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
303 | ||
66018506 | 304 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
305 | for (rap = &ip_ra_chain; |
306 | (ra = rcu_dereference_protected(*rap, | |
307 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
308 | rap = &ra->next) { | |
1da177e4 LT |
309 | if (ra->sk == sk) { |
310 | if (on) { | |
66018506 | 311 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 312 | kfree(new_ra); |
1da177e4 LT |
313 | return -EADDRINUSE; |
314 | } | |
592fcb9d ED |
315 | /* dont let ip_call_ra_chain() use sk again */ |
316 | ra->sk = NULL; | |
8e380f00 | 317 | RCU_INIT_POINTER(*rap, ra->next); |
66018506 | 318 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
319 | |
320 | if (ra->destructor) | |
321 | ra->destructor(sk); | |
592fcb9d ED |
322 | /* |
323 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
324 | * period. This guarantee ip_call_ra_chain() dont need | |
325 | * to mess with socket refcounts. | |
326 | */ | |
327 | ra->saved_sk = sk; | |
328 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
329 | return 0; |
330 | } | |
331 | } | |
332 | if (new_ra == NULL) { | |
66018506 | 333 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
334 | return -ENOBUFS; |
335 | } | |
336 | new_ra->sk = sk; | |
337 | new_ra->destructor = destructor; | |
338 | ||
8e380f00 | 339 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 340 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 341 | sock_hold(sk); |
66018506 | 342 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
343 | |
344 | return 0; | |
345 | } | |
346 | ||
e905a9ed | 347 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 348 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 349 | { |
1da177e4 LT |
350 | struct sock_exterr_skb *serr; |
351 | ||
1da177e4 LT |
352 | skb = skb_clone(skb, GFP_ATOMIC); |
353 | if (!skb) | |
354 | return; | |
355 | ||
e905a9ed | 356 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
357 | serr->ee.ee_errno = err; |
358 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
359 | serr->ee.ee_type = icmp_hdr(skb)->type; |
360 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
361 | serr->ee.ee_pad = 0; |
362 | serr->ee.ee_info = info; | |
363 | serr->ee.ee_data = 0; | |
88c7664f | 364 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 365 | skb_network_header(skb); |
1da177e4 LT |
366 | serr->port = port; |
367 | ||
bd82393c ACM |
368 | if (skb_pull(skb, payload - skb->data) != NULL) { |
369 | skb_reset_transport_header(skb); | |
370 | if (sock_queue_err_skb(sk, skb) == 0) | |
371 | return; | |
372 | } | |
373 | kfree_skb(skb); | |
1da177e4 LT |
374 | } |
375 | ||
0579016e | 376 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
377 | { |
378 | struct inet_sock *inet = inet_sk(sk); | |
379 | struct sock_exterr_skb *serr; | |
380 | struct iphdr *iph; | |
381 | struct sk_buff *skb; | |
382 | ||
383 | if (!inet->recverr) | |
384 | return; | |
385 | ||
386 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
387 | if (!skb) | |
388 | return; | |
389 | ||
2ca9e6f2 ACM |
390 | skb_put(skb, sizeof(struct iphdr)); |
391 | skb_reset_network_header(skb); | |
eddc9ec5 | 392 | iph = ip_hdr(skb); |
1da177e4 LT |
393 | iph->daddr = daddr; |
394 | ||
e905a9ed | 395 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
396 | serr->ee.ee_errno = err; |
397 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 398 | serr->ee.ee_type = 0; |
1da177e4 LT |
399 | serr->ee.ee_code = 0; |
400 | serr->ee.ee_pad = 0; | |
401 | serr->ee.ee_info = info; | |
402 | serr->ee.ee_data = 0; | |
d56f90a7 | 403 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
404 | serr->port = port; |
405 | ||
27a884dc | 406 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 407 | skb_reset_transport_header(skb); |
1da177e4 LT |
408 | |
409 | if (sock_queue_err_skb(sk, skb)) | |
410 | kfree_skb(skb); | |
411 | } | |
412 | ||
829ae9d6 WB |
413 | static bool ipv4_pktinfo_prepare_errqueue(const struct sock *sk, |
414 | const struct sk_buff *skb, | |
415 | int ee_origin) | |
416 | { | |
417 | struct in_pktinfo *info = PKTINFO_SKB_CB(skb); | |
418 | ||
419 | if ((ee_origin != SO_EE_ORIGIN_TIMESTAMPING) || | |
420 | (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || | |
421 | (!skb->dev)) | |
422 | return false; | |
423 | ||
424 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
425 | info->ipi_ifindex = skb->dev->ifindex; | |
426 | return true; | |
427 | } | |
428 | ||
e905a9ed | 429 | /* |
1da177e4 LT |
430 | * Handle MSG_ERRQUEUE |
431 | */ | |
85fbaa75 | 432 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
433 | { |
434 | struct sock_exterr_skb *serr; | |
364a9e93 | 435 | struct sk_buff *skb; |
342dfc30 | 436 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
437 | struct { |
438 | struct sock_extended_err ee; | |
439 | struct sockaddr_in offender; | |
440 | } errhdr; | |
441 | int err; | |
442 | int copied; | |
443 | ||
7ce875e5 WB |
444 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
445 | ||
1da177e4 | 446 | err = -EAGAIN; |
364a9e93 | 447 | skb = sock_dequeue_err_skb(sk); |
1da177e4 LT |
448 | if (skb == NULL) |
449 | goto out; | |
450 | ||
451 | copied = skb->len; | |
452 | if (copied > len) { | |
453 | msg->msg_flags |= MSG_TRUNC; | |
454 | copied = len; | |
455 | } | |
51f3d02b | 456 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
457 | if (err) |
458 | goto out_free_skb; | |
459 | ||
460 | sock_recv_timestamp(msg, sk, skb); | |
461 | ||
462 | serr = SKB_EXT_ERR(skb); | |
463 | ||
1da177e4 LT |
464 | if (sin) { |
465 | sin->sin_family = AF_INET; | |
d56f90a7 ACM |
466 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
467 | serr->addr_offset); | |
1da177e4 LT |
468 | sin->sin_port = serr->port; |
469 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 470 | *addr_len = sizeof(*sin); |
1da177e4 LT |
471 | } |
472 | ||
473 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
474 | sin = &errhdr.offender; | |
475 | sin->sin_family = AF_UNSPEC; | |
829ae9d6 WB |
476 | |
477 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
478 | ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin)) { | |
1da177e4 LT |
479 | struct inet_sock *inet = inet_sk(sk); |
480 | ||
481 | sin->sin_family = AF_INET; | |
eddc9ec5 | 482 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
483 | sin->sin_port = 0; |
484 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
485 | if (inet->cmsg_flags) | |
486 | ip_cmsg_recv(msg, skb); | |
487 | } | |
488 | ||
489 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
490 | ||
491 | /* Now we could try to dump offended packet options */ | |
492 | ||
493 | msg->msg_flags |= MSG_ERRQUEUE; | |
494 | err = copied; | |
495 | ||
e905a9ed | 496 | out_free_skb: |
1da177e4 LT |
497 | kfree_skb(skb); |
498 | out: | |
499 | return err; | |
500 | } | |
501 | ||
502 | ||
503 | /* | |
4d52cfbe ED |
504 | * Socket option code for IP. This is the end of the line after any |
505 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
506 | */ |
507 | ||
3fdadf7d | 508 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 509 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
510 | { |
511 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 512 | int val = 0, err; |
1da177e4 | 513 | |
0c9f79be XW |
514 | switch (optname) { |
515 | case IP_PKTINFO: | |
516 | case IP_RECVTTL: | |
517 | case IP_RECVOPTS: | |
518 | case IP_RECVTOS: | |
519 | case IP_RETOPTS: | |
520 | case IP_TOS: | |
521 | case IP_TTL: | |
522 | case IP_HDRINCL: | |
523 | case IP_MTU_DISCOVER: | |
524 | case IP_RECVERR: | |
525 | case IP_ROUTER_ALERT: | |
526 | case IP_FREEBIND: | |
527 | case IP_PASSSEC: | |
528 | case IP_TRANSPARENT: | |
529 | case IP_MINTTL: | |
530 | case IP_NODEFRAG: | |
531 | case IP_UNICAST_IF: | |
532 | case IP_MULTICAST_TTL: | |
533 | case IP_MULTICAST_ALL: | |
534 | case IP_MULTICAST_LOOP: | |
535 | case IP_RECVORIGDSTADDR: | |
1da177e4 LT |
536 | if (optlen >= sizeof(int)) { |
537 | if (get_user(val, (int __user *) optval)) | |
538 | return -EFAULT; | |
539 | } else if (optlen >= sizeof(char)) { | |
540 | unsigned char ucval; | |
541 | ||
542 | if (get_user(ucval, (unsigned char __user *) optval)) | |
543 | return -EFAULT; | |
544 | val = (int) ucval; | |
545 | } | |
546 | } | |
547 | ||
548 | /* If optlen==0, it is equivalent to val == 0 */ | |
549 | ||
6a9fb947 | 550 | if (ip_mroute_opt(optname)) |
09cb105e | 551 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
552 | |
553 | err = 0; | |
554 | lock_sock(sk); | |
555 | ||
556 | switch (optname) { | |
132adf54 SH |
557 | case IP_OPTIONS: |
558 | { | |
f6d8bd05 ED |
559 | struct ip_options_rcu *old, *opt = NULL; |
560 | ||
65a1c4ff | 561 | if (optlen > 40) |
132adf54 | 562 | goto e_inval; |
3b1e0a65 | 563 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 564 | optval, optlen); |
132adf54 SH |
565 | if (err) |
566 | break; | |
f6d8bd05 ED |
567 | old = rcu_dereference_protected(inet->inet_opt, |
568 | sock_owned_by_user(sk)); | |
132adf54 SH |
569 | if (inet->is_icsk) { |
570 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 571 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
572 | if (sk->sk_family == PF_INET || |
573 | (!((1 << sk->sk_state) & | |
574 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 575 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 576 | #endif |
f6d8bd05 ED |
577 | if (old) |
578 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 579 | if (opt) |
f6d8bd05 | 580 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 581 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 582 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 583 | } |
132adf54 | 584 | #endif |
1da177e4 | 585 | } |
f6d8bd05 ED |
586 | rcu_assign_pointer(inet->inet_opt, opt); |
587 | if (old) | |
605b4afe | 588 | kfree_rcu(old, rcu); |
132adf54 SH |
589 | break; |
590 | } | |
591 | case IP_PKTINFO: | |
592 | if (val) | |
593 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
594 | else | |
595 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
596 | break; | |
597 | case IP_RECVTTL: | |
598 | if (val) | |
599 | inet->cmsg_flags |= IP_CMSG_TTL; | |
600 | else | |
601 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
602 | break; | |
603 | case IP_RECVTOS: | |
604 | if (val) | |
605 | inet->cmsg_flags |= IP_CMSG_TOS; | |
606 | else | |
607 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
608 | break; | |
609 | case IP_RECVOPTS: | |
610 | if (val) | |
611 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
612 | else | |
613 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
614 | break; | |
615 | case IP_RETOPTS: | |
616 | if (val) | |
617 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
618 | else | |
619 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
620 | break; | |
621 | case IP_PASSSEC: | |
622 | if (val) | |
623 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
624 | else | |
625 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
626 | break; | |
e8b2dfe9 BS |
627 | case IP_RECVORIGDSTADDR: |
628 | if (val) | |
629 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
630 | else | |
631 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
632 | break; | |
132adf54 SH |
633 | case IP_TOS: /* This sets both TOS and Precedence */ |
634 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
635 | val &= ~INET_ECN_MASK; |
636 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 637 | } |
132adf54 SH |
638 | if (inet->tos != val) { |
639 | inet->tos = val; | |
640 | sk->sk_priority = rt_tos2priority(val); | |
641 | sk_dst_reset(sk); | |
642 | } | |
643 | break; | |
644 | case IP_TTL: | |
4d52cfbe | 645 | if (optlen < 1) |
132adf54 | 646 | goto e_inval; |
c9be4a5c | 647 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
648 | goto e_inval; |
649 | inet->uc_ttl = val; | |
650 | break; | |
651 | case IP_HDRINCL: | |
652 | if (sk->sk_type != SOCK_RAW) { | |
653 | err = -ENOPROTOOPT; | |
2c7946a7 | 654 | break; |
132adf54 SH |
655 | } |
656 | inet->hdrincl = val ? 1 : 0; | |
657 | break; | |
7b2ff18e JO |
658 | case IP_NODEFRAG: |
659 | if (sk->sk_type != SOCK_RAW) { | |
660 | err = -ENOPROTOOPT; | |
661 | break; | |
662 | } | |
663 | inet->nodefrag = val ? 1 : 0; | |
664 | break; | |
132adf54 | 665 | case IP_MTU_DISCOVER: |
1b346576 | 666 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
667 | goto e_inval; |
668 | inet->pmtudisc = val; | |
669 | break; | |
670 | case IP_RECVERR: | |
671 | inet->recverr = !!val; | |
672 | if (!val) | |
673 | skb_queue_purge(&sk->sk_error_queue); | |
674 | break; | |
675 | case IP_MULTICAST_TTL: | |
676 | if (sk->sk_type == SOCK_STREAM) | |
677 | goto e_inval; | |
4d52cfbe | 678 | if (optlen < 1) |
132adf54 | 679 | goto e_inval; |
09cb105e | 680 | if (val == -1) |
132adf54 SH |
681 | val = 1; |
682 | if (val < 0 || val > 255) | |
683 | goto e_inval; | |
684 | inet->mc_ttl = val; | |
685 | break; | |
686 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 687 | if (optlen < 1) |
132adf54 SH |
688 | goto e_inval; |
689 | inet->mc_loop = !!val; | |
690 | break; | |
76e21053 EH |
691 | case IP_UNICAST_IF: |
692 | { | |
693 | struct net_device *dev = NULL; | |
694 | int ifindex; | |
695 | ||
696 | if (optlen != sizeof(int)) | |
697 | goto e_inval; | |
698 | ||
699 | ifindex = (__force int)ntohl((__force __be32)val); | |
700 | if (ifindex == 0) { | |
701 | inet->uc_index = 0; | |
702 | err = 0; | |
703 | break; | |
704 | } | |
705 | ||
706 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
707 | err = -EADDRNOTAVAIL; | |
708 | if (!dev) | |
709 | break; | |
710 | dev_put(dev); | |
711 | ||
712 | err = -EINVAL; | |
713 | if (sk->sk_bound_dev_if) | |
714 | break; | |
715 | ||
716 | inet->uc_index = ifindex; | |
717 | err = 0; | |
718 | break; | |
719 | } | |
132adf54 SH |
720 | case IP_MULTICAST_IF: |
721 | { | |
722 | struct ip_mreqn mreq; | |
723 | struct net_device *dev = NULL; | |
724 | ||
725 | if (sk->sk_type == SOCK_STREAM) | |
726 | goto e_inval; | |
727 | /* | |
728 | * Check the arguments are allowable | |
729 | */ | |
730 | ||
0915921b SW |
731 | if (optlen < sizeof(struct in_addr)) |
732 | goto e_inval; | |
733 | ||
132adf54 SH |
734 | err = -EFAULT; |
735 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 736 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 737 | break; |
132adf54 SH |
738 | } else { |
739 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
740 | if (optlen >= sizeof(struct ip_mreq)) { |
741 | if (copy_from_user(&mreq, optval, | |
742 | sizeof(struct ip_mreq))) | |
743 | break; | |
744 | } else if (optlen >= sizeof(struct in_addr)) { | |
745 | if (copy_from_user(&mreq.imr_address, optval, | |
746 | sizeof(struct in_addr))) | |
747 | break; | |
748 | } | |
132adf54 SH |
749 | } |
750 | ||
751 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 752 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
753 | inet->mc_index = 0; |
754 | inet->mc_addr = 0; | |
755 | err = 0; | |
1da177e4 LT |
756 | break; |
757 | } | |
3b1e0a65 | 758 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 759 | if (dev) |
132adf54 | 760 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 761 | } else |
55b80503 | 762 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 763 | |
1da177e4 | 764 | |
132adf54 SH |
765 | err = -EADDRNOTAVAIL; |
766 | if (!dev) | |
767 | break; | |
55b80503 | 768 | dev_put(dev); |
132adf54 SH |
769 | |
770 | err = -EINVAL; | |
771 | if (sk->sk_bound_dev_if && | |
772 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
773 | break; | |
1da177e4 | 774 | |
132adf54 SH |
775 | inet->mc_index = mreq.imr_ifindex; |
776 | inet->mc_addr = mreq.imr_address.s_addr; | |
777 | err = 0; | |
778 | break; | |
779 | } | |
1da177e4 | 780 | |
132adf54 SH |
781 | case IP_ADD_MEMBERSHIP: |
782 | case IP_DROP_MEMBERSHIP: | |
783 | { | |
784 | struct ip_mreqn mreq; | |
1da177e4 | 785 | |
a96fb49b FL |
786 | err = -EPROTO; |
787 | if (inet_sk(sk)->is_icsk) | |
788 | break; | |
789 | ||
132adf54 SH |
790 | if (optlen < sizeof(struct ip_mreq)) |
791 | goto e_inval; | |
792 | err = -EFAULT; | |
793 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 794 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 795 | break; |
132adf54 SH |
796 | } else { |
797 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 798 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 799 | break; |
132adf54 | 800 | } |
1da177e4 | 801 | |
132adf54 SH |
802 | if (optname == IP_ADD_MEMBERSHIP) |
803 | err = ip_mc_join_group(sk, &mreq); | |
804 | else | |
805 | err = ip_mc_leave_group(sk, &mreq); | |
806 | break; | |
807 | } | |
808 | case IP_MSFILTER: | |
809 | { | |
132adf54 SH |
810 | struct ip_msfilter *msf; |
811 | ||
812 | if (optlen < IP_MSFILTER_SIZE(0)) | |
813 | goto e_inval; | |
814 | if (optlen > sysctl_optmem_max) { | |
815 | err = -ENOBUFS; | |
1da177e4 LT |
816 | break; |
817 | } | |
132adf54 | 818 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 819 | if (!msf) { |
132adf54 SH |
820 | err = -ENOBUFS; |
821 | break; | |
822 | } | |
823 | err = -EFAULT; | |
824 | if (copy_from_user(msf, optval, optlen)) { | |
825 | kfree(msf); | |
826 | break; | |
827 | } | |
828 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
829 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
830 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
831 | kfree(msf); | |
832 | err = -ENOBUFS; | |
833 | break; | |
834 | } | |
835 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
836 | kfree(msf); | |
837 | err = -EINVAL; | |
838 | break; | |
839 | } | |
840 | err = ip_mc_msfilter(sk, msf, 0); | |
841 | kfree(msf); | |
842 | break; | |
843 | } | |
844 | case IP_BLOCK_SOURCE: | |
845 | case IP_UNBLOCK_SOURCE: | |
846 | case IP_ADD_SOURCE_MEMBERSHIP: | |
847 | case IP_DROP_SOURCE_MEMBERSHIP: | |
848 | { | |
849 | struct ip_mreq_source mreqs; | |
850 | int omode, add; | |
1da177e4 | 851 | |
132adf54 SH |
852 | if (optlen != sizeof(struct ip_mreq_source)) |
853 | goto e_inval; | |
854 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 855 | err = -EFAULT; |
1da177e4 LT |
856 | break; |
857 | } | |
132adf54 SH |
858 | if (optname == IP_BLOCK_SOURCE) { |
859 | omode = MCAST_EXCLUDE; | |
860 | add = 1; | |
861 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
862 | omode = MCAST_EXCLUDE; | |
863 | add = 0; | |
864 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
865 | struct ip_mreqn mreq; | |
1da177e4 | 866 | |
132adf54 SH |
867 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
868 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
869 | mreq.imr_ifindex = 0; | |
870 | err = ip_mc_join_group(sk, &mreq); | |
871 | if (err && err != -EADDRINUSE) | |
1da177e4 | 872 | break; |
132adf54 SH |
873 | omode = MCAST_INCLUDE; |
874 | add = 1; | |
875 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
876 | omode = MCAST_INCLUDE; | |
877 | add = 0; | |
878 | } | |
879 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
880 | break; | |
881 | } | |
882 | case MCAST_JOIN_GROUP: | |
883 | case MCAST_LEAVE_GROUP: | |
884 | { | |
885 | struct group_req greq; | |
886 | struct sockaddr_in *psin; | |
887 | struct ip_mreqn mreq; | |
888 | ||
889 | if (optlen < sizeof(struct group_req)) | |
890 | goto e_inval; | |
891 | err = -EFAULT; | |
892 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
893 | break; | |
894 | psin = (struct sockaddr_in *)&greq.gr_group; | |
895 | if (psin->sin_family != AF_INET) | |
896 | goto e_inval; | |
897 | memset(&mreq, 0, sizeof(mreq)); | |
898 | mreq.imr_multiaddr = psin->sin_addr; | |
899 | mreq.imr_ifindex = greq.gr_interface; | |
900 | ||
901 | if (optname == MCAST_JOIN_GROUP) | |
902 | err = ip_mc_join_group(sk, &mreq); | |
903 | else | |
904 | err = ip_mc_leave_group(sk, &mreq); | |
905 | break; | |
906 | } | |
907 | case MCAST_JOIN_SOURCE_GROUP: | |
908 | case MCAST_LEAVE_SOURCE_GROUP: | |
909 | case MCAST_BLOCK_SOURCE: | |
910 | case MCAST_UNBLOCK_SOURCE: | |
911 | { | |
912 | struct group_source_req greqs; | |
913 | struct ip_mreq_source mreqs; | |
914 | struct sockaddr_in *psin; | |
915 | int omode, add; | |
916 | ||
917 | if (optlen != sizeof(struct group_source_req)) | |
918 | goto e_inval; | |
919 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 920 | err = -EFAULT; |
1da177e4 LT |
921 | break; |
922 | } | |
132adf54 SH |
923 | if (greqs.gsr_group.ss_family != AF_INET || |
924 | greqs.gsr_source.ss_family != AF_INET) { | |
925 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
926 | break; |
927 | } | |
132adf54 SH |
928 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
929 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
930 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
931 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
932 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
933 | ||
934 | if (optname == MCAST_BLOCK_SOURCE) { | |
935 | omode = MCAST_EXCLUDE; | |
936 | add = 1; | |
937 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
938 | omode = MCAST_EXCLUDE; | |
939 | add = 0; | |
940 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
941 | struct ip_mreqn mreq; |
942 | ||
132adf54 | 943 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 944 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
945 | mreq.imr_address.s_addr = 0; |
946 | mreq.imr_ifindex = greqs.gsr_interface; | |
947 | err = ip_mc_join_group(sk, &mreq); | |
948 | if (err && err != -EADDRINUSE) | |
949 | break; | |
950 | greqs.gsr_interface = mreq.imr_ifindex; | |
951 | omode = MCAST_INCLUDE; | |
952 | add = 1; | |
953 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
954 | omode = MCAST_INCLUDE; | |
955 | add = 0; | |
956 | } | |
957 | err = ip_mc_source(add, omode, sk, &mreqs, | |
958 | greqs.gsr_interface); | |
959 | break; | |
960 | } | |
961 | case MCAST_MSFILTER: | |
962 | { | |
132adf54 SH |
963 | struct sockaddr_in *psin; |
964 | struct ip_msfilter *msf = NULL; | |
965 | struct group_filter *gsf = NULL; | |
966 | int msize, i, ifindex; | |
967 | ||
968 | if (optlen < GROUP_FILTER_SIZE(0)) | |
969 | goto e_inval; | |
970 | if (optlen > sysctl_optmem_max) { | |
971 | err = -ENOBUFS; | |
1da177e4 LT |
972 | break; |
973 | } | |
09cb105e | 974 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 975 | if (!gsf) { |
132adf54 | 976 | err = -ENOBUFS; |
1da177e4 LT |
977 | break; |
978 | } | |
132adf54 | 979 | err = -EFAULT; |
4d52cfbe | 980 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 981 | goto mc_msf_out; |
4d52cfbe | 982 | |
132adf54 SH |
983 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
984 | if (gsf->gf_numsrc >= 0x1ffffff || | |
985 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
986 | err = -ENOBUFS; | |
987 | goto mc_msf_out; | |
988 | } | |
989 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
990 | err = -EINVAL; | |
991 | goto mc_msf_out; | |
992 | } | |
993 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 994 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 995 | if (!msf) { |
132adf54 SH |
996 | err = -ENOBUFS; |
997 | goto mc_msf_out; | |
998 | } | |
999 | ifindex = gsf->gf_interface; | |
1000 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1001 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1002 | err = -EADDRNOTAVAIL; |
132adf54 | 1003 | goto mc_msf_out; |
1da177e4 | 1004 | } |
132adf54 SH |
1005 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1006 | msf->imsf_interface = 0; | |
1007 | msf->imsf_fmode = gsf->gf_fmode; | |
1008 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1009 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1010 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1011 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1012 | |
132adf54 SH |
1013 | if (psin->sin_family != AF_INET) |
1014 | goto mc_msf_out; | |
1015 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1016 | } | |
1017 | kfree(gsf); | |
1018 | gsf = NULL; | |
1019 | ||
1020 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1021 | mc_msf_out: |
132adf54 SH |
1022 | kfree(msf); |
1023 | kfree(gsf); | |
1024 | break; | |
1025 | } | |
f771bef9 NS |
1026 | case IP_MULTICAST_ALL: |
1027 | if (optlen < 1) | |
1028 | goto e_inval; | |
1029 | if (val != 0 && val != 1) | |
1030 | goto e_inval; | |
1031 | inet->mc_all = val; | |
1032 | break; | |
132adf54 SH |
1033 | case IP_ROUTER_ALERT: |
1034 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1035 | break; | |
1036 | ||
1037 | case IP_FREEBIND: | |
4d52cfbe | 1038 | if (optlen < 1) |
132adf54 SH |
1039 | goto e_inval; |
1040 | inet->freebind = !!val; | |
1041 | break; | |
1042 | ||
1043 | case IP_IPSEC_POLICY: | |
1044 | case IP_XFRM_POLICY: | |
1045 | err = -EPERM; | |
52e804c6 | 1046 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1047 | break; |
132adf54 SH |
1048 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1049 | break; | |
1da177e4 | 1050 | |
f5715aea | 1051 | case IP_TRANSPARENT: |
52e804c6 EB |
1052 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1053 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1054 | err = -EPERM; |
1055 | break; | |
1056 | } | |
1057 | if (optlen < 1) | |
1058 | goto e_inval; | |
1059 | inet->transparent = !!val; | |
1060 | break; | |
1061 | ||
d218d111 SH |
1062 | case IP_MINTTL: |
1063 | if (optlen < 1) | |
1064 | goto e_inval; | |
1065 | if (val < 0 || val > 255) | |
1066 | goto e_inval; | |
1067 | inet->min_ttl = val; | |
1068 | break; | |
1069 | ||
132adf54 SH |
1070 | default: |
1071 | err = -ENOPROTOOPT; | |
1072 | break; | |
1da177e4 LT |
1073 | } |
1074 | release_sock(sk); | |
1075 | return err; | |
1076 | ||
1077 | e_inval: | |
1078 | release_sock(sk); | |
1079 | return -EINVAL; | |
1080 | } | |
1081 | ||
f84af32c | 1082 | /** |
829ae9d6 | 1083 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1084 | * @sk: socket |
1085 | * @skb: buffer | |
1086 | * | |
35ebf65e DM |
1087 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1088 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1089 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1090 | */ |
fbf8866d | 1091 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1092 | { |
d826eb14 | 1093 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1094 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1095 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1096 | |
4b261c75 | 1097 | if (prepare && skb_rtable(skb)) { |
92101b3b | 1098 | pktinfo->ipi_ifindex = inet_iif(skb); |
35ebf65e | 1099 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1100 | } else { |
1101 | pktinfo->ipi_ifindex = 0; | |
1102 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1103 | } | |
1104 | skb_dst_drop(skb); | |
f84af32c | 1105 | } |
f84af32c | 1106 | |
3fdadf7d | 1107 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1108 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1109 | { |
1110 | int err; | |
1111 | ||
1112 | if (level != SOL_IP) | |
1113 | return -ENOPROTOOPT; | |
1114 | ||
1115 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1116 | #ifdef CONFIG_NETFILTER | |
1117 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1118 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1119 | optname != IP_IPSEC_POLICY && |
1120 | optname != IP_XFRM_POLICY && | |
1121 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1122 | lock_sock(sk); |
1123 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1124 | release_sock(sk); | |
1125 | } | |
1126 | #endif | |
1127 | return err; | |
1128 | } | |
4d52cfbe | 1129 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1130 | |
1131 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1132 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1133 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1134 | { |
1135 | int err; | |
1136 | ||
1137 | if (level != SOL_IP) | |
1138 | return -ENOPROTOOPT; | |
1139 | ||
dae50295 DS |
1140 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1141 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1142 | ip_setsockopt); | |
1143 | ||
3fdadf7d DM |
1144 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1145 | #ifdef CONFIG_NETFILTER | |
1146 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1147 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1148 | optname != IP_IPSEC_POLICY && |
1149 | optname != IP_XFRM_POLICY && | |
1150 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1151 | lock_sock(sk); |
543d9cfe ACM |
1152 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1153 | optval, optlen); | |
3fdadf7d DM |
1154 | release_sock(sk); |
1155 | } | |
1156 | #endif | |
1157 | return err; | |
1158 | } | |
543d9cfe | 1159 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1160 | #endif |
1161 | ||
1da177e4 | 1162 | /* |
4d52cfbe ED |
1163 | * Get the options. Note for future reference. The GET of IP options gets |
1164 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1165 | */ |
1166 | ||
3fdadf7d | 1167 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1168 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1169 | { |
1170 | struct inet_sock *inet = inet_sk(sk); | |
1171 | int val; | |
1172 | int len; | |
e905a9ed | 1173 | |
132adf54 | 1174 | if (level != SOL_IP) |
1da177e4 LT |
1175 | return -EOPNOTSUPP; |
1176 | ||
6a9fb947 | 1177 | if (ip_mroute_opt(optname)) |
09cb105e | 1178 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1179 | |
09cb105e | 1180 | if (get_user(len, optlen)) |
1da177e4 | 1181 | return -EFAULT; |
132adf54 | 1182 | if (len < 0) |
1da177e4 | 1183 | return -EINVAL; |
e905a9ed | 1184 | |
1da177e4 LT |
1185 | lock_sock(sk); |
1186 | ||
132adf54 SH |
1187 | switch (optname) { |
1188 | case IP_OPTIONS: | |
1189 | { | |
1190 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1191 | struct ip_options *opt = (struct ip_options *)optbuf; |
1192 | struct ip_options_rcu *inet_opt; | |
1193 | ||
1194 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1195 | sock_owned_by_user(sk)); | |
132adf54 | 1196 | opt->optlen = 0; |
f6d8bd05 ED |
1197 | if (inet_opt) |
1198 | memcpy(optbuf, &inet_opt->opt, | |
1199 | sizeof(struct ip_options) + | |
1200 | inet_opt->opt.optlen); | |
132adf54 SH |
1201 | release_sock(sk); |
1202 | ||
1203 | if (opt->optlen == 0) | |
1204 | return put_user(0, optlen); | |
1205 | ||
1206 | ip_options_undo(opt); | |
1207 | ||
1208 | len = min_t(unsigned int, len, opt->optlen); | |
1209 | if (put_user(len, optlen)) | |
1210 | return -EFAULT; | |
1211 | if (copy_to_user(optval, opt->__data, len)) | |
1212 | return -EFAULT; | |
1213 | return 0; | |
1214 | } | |
1215 | case IP_PKTINFO: | |
1216 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1217 | break; | |
1218 | case IP_RECVTTL: | |
1219 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1220 | break; | |
1221 | case IP_RECVTOS: | |
1222 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1223 | break; | |
1224 | case IP_RECVOPTS: | |
1225 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1226 | break; | |
1227 | case IP_RETOPTS: | |
1228 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1229 | break; | |
1230 | case IP_PASSSEC: | |
1231 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1232 | break; | |
e8b2dfe9 BS |
1233 | case IP_RECVORIGDSTADDR: |
1234 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1235 | break; | |
132adf54 SH |
1236 | case IP_TOS: |
1237 | val = inet->tos; | |
1238 | break; | |
1239 | case IP_TTL: | |
1240 | val = (inet->uc_ttl == -1 ? | |
1241 | sysctl_ip_default_ttl : | |
1242 | inet->uc_ttl); | |
1243 | break; | |
1244 | case IP_HDRINCL: | |
1245 | val = inet->hdrincl; | |
1246 | break; | |
a89b4763 MK |
1247 | case IP_NODEFRAG: |
1248 | val = inet->nodefrag; | |
1249 | break; | |
132adf54 SH |
1250 | case IP_MTU_DISCOVER: |
1251 | val = inet->pmtudisc; | |
1252 | break; | |
1253 | case IP_MTU: | |
1254 | { | |
1255 | struct dst_entry *dst; | |
1256 | val = 0; | |
1257 | dst = sk_dst_get(sk); | |
1258 | if (dst) { | |
1259 | val = dst_mtu(dst); | |
1260 | dst_release(dst); | |
1da177e4 | 1261 | } |
132adf54 | 1262 | if (!val) { |
1da177e4 | 1263 | release_sock(sk); |
132adf54 | 1264 | return -ENOTCONN; |
1da177e4 | 1265 | } |
132adf54 SH |
1266 | break; |
1267 | } | |
1268 | case IP_RECVERR: | |
1269 | val = inet->recverr; | |
1270 | break; | |
1271 | case IP_MULTICAST_TTL: | |
1272 | val = inet->mc_ttl; | |
1273 | break; | |
1274 | case IP_MULTICAST_LOOP: | |
1275 | val = inet->mc_loop; | |
1276 | break; | |
76e21053 EH |
1277 | case IP_UNICAST_IF: |
1278 | val = (__force int)htonl((__u32) inet->uc_index); | |
1279 | break; | |
132adf54 SH |
1280 | case IP_MULTICAST_IF: |
1281 | { | |
1282 | struct in_addr addr; | |
1283 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1284 | addr.s_addr = inet->mc_addr; | |
1285 | release_sock(sk); | |
1da177e4 | 1286 | |
132adf54 SH |
1287 | if (put_user(len, optlen)) |
1288 | return -EFAULT; | |
1289 | if (copy_to_user(optval, &addr, len)) | |
1290 | return -EFAULT; | |
1291 | return 0; | |
1292 | } | |
1293 | case IP_MSFILTER: | |
1294 | { | |
1295 | struct ip_msfilter msf; | |
1296 | int err; | |
1297 | ||
1298 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1299 | release_sock(sk); |
132adf54 | 1300 | return -EINVAL; |
1da177e4 | 1301 | } |
132adf54 | 1302 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1303 | release_sock(sk); |
132adf54 | 1304 | return -EFAULT; |
1da177e4 | 1305 | } |
132adf54 SH |
1306 | err = ip_mc_msfget(sk, &msf, |
1307 | (struct ip_msfilter __user *)optval, optlen); | |
1308 | release_sock(sk); | |
1309 | return err; | |
1310 | } | |
1311 | case MCAST_MSFILTER: | |
1312 | { | |
1313 | struct group_filter gsf; | |
1314 | int err; | |
1da177e4 | 1315 | |
132adf54 | 1316 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1317 | release_sock(sk); |
132adf54 SH |
1318 | return -EINVAL; |
1319 | } | |
1320 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1321 | release_sock(sk); | |
1322 | return -EFAULT; | |
1323 | } | |
1324 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1325 | (struct group_filter __user *)optval, |
1326 | optlen); | |
132adf54 SH |
1327 | release_sock(sk); |
1328 | return err; | |
1329 | } | |
f771bef9 NS |
1330 | case IP_MULTICAST_ALL: |
1331 | val = inet->mc_all; | |
1332 | break; | |
132adf54 SH |
1333 | case IP_PKTOPTIONS: |
1334 | { | |
1335 | struct msghdr msg; | |
1da177e4 | 1336 | |
132adf54 | 1337 | release_sock(sk); |
1da177e4 | 1338 | |
132adf54 SH |
1339 | if (sk->sk_type != SOCK_STREAM) |
1340 | return -ENOPROTOOPT; | |
1da177e4 | 1341 | |
c54a5e02 | 1342 | msg.msg_control = (__force void *) optval; |
132adf54 | 1343 | msg.msg_controllen = len; |
dd23198e | 1344 | msg.msg_flags = flags; |
1da177e4 | 1345 | |
132adf54 SH |
1346 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1347 | struct in_pktinfo info; | |
1348 | ||
c720c7e8 ED |
1349 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1350 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1351 | info.ipi_ifindex = inet->mc_index; |
1352 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1353 | } |
132adf54 SH |
1354 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1355 | int hlim = inet->mc_ttl; | |
1356 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1357 | } | |
4c507d28 JB |
1358 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1359 | int tos = inet->rcv_tos; | |
1360 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1361 | } | |
132adf54 SH |
1362 | len -= msg.msg_controllen; |
1363 | return put_user(len, optlen); | |
1364 | } | |
1365 | case IP_FREEBIND: | |
1366 | val = inet->freebind; | |
1367 | break; | |
f5715aea KK |
1368 | case IP_TRANSPARENT: |
1369 | val = inet->transparent; | |
1370 | break; | |
d218d111 SH |
1371 | case IP_MINTTL: |
1372 | val = inet->min_ttl; | |
1373 | break; | |
132adf54 SH |
1374 | default: |
1375 | release_sock(sk); | |
1376 | return -ENOPROTOOPT; | |
1da177e4 LT |
1377 | } |
1378 | release_sock(sk); | |
e905a9ed | 1379 | |
4d52cfbe | 1380 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1381 | unsigned char ucval = (unsigned char)val; |
1382 | len = 1; | |
132adf54 | 1383 | if (put_user(len, optlen)) |
1da177e4 | 1384 | return -EFAULT; |
09cb105e | 1385 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1386 | return -EFAULT; |
1387 | } else { | |
1388 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1389 | if (put_user(len, optlen)) |
1da177e4 | 1390 | return -EFAULT; |
09cb105e | 1391 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1392 | return -EFAULT; |
1393 | } | |
1394 | return 0; | |
1395 | } | |
1396 | ||
3fdadf7d | 1397 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1398 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1399 | { |
1400 | int err; | |
1401 | ||
dd23198e | 1402 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1403 | #ifdef CONFIG_NETFILTER |
1404 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1405 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1406 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1407 | int len; |
3fdadf7d | 1408 | |
09cb105e | 1409 | if (get_user(len, optlen)) |
3fdadf7d DM |
1410 | return -EFAULT; |
1411 | ||
1412 | lock_sock(sk); | |
1413 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1414 | &len); | |
1415 | release_sock(sk); | |
1416 | if (err >= 0) | |
1417 | err = put_user(len, optlen); | |
1418 | return err; | |
1419 | } | |
1420 | #endif | |
1421 | return err; | |
1422 | } | |
4d52cfbe | 1423 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1424 | |
1425 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1426 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1427 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1428 | { |
42908c69 DS |
1429 | int err; |
1430 | ||
1431 | if (optname == MCAST_MSFILTER) | |
1432 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1433 | ip_getsockopt); | |
1434 | ||
dd23198e DB |
1435 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1436 | MSG_CMSG_COMPAT); | |
42908c69 | 1437 | |
3fdadf7d DM |
1438 | #ifdef CONFIG_NETFILTER |
1439 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1440 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1441 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1442 | int len; |
3fdadf7d | 1443 | |
543d9cfe | 1444 | if (get_user(len, optlen)) |
3fdadf7d DM |
1445 | return -EFAULT; |
1446 | ||
1447 | lock_sock(sk); | |
543d9cfe | 1448 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1449 | release_sock(sk); |
1450 | if (err >= 0) | |
1451 | err = put_user(len, optlen); | |
1452 | return err; | |
1453 | } | |
1454 | #endif | |
1455 | return err; | |
1456 | } | |
543d9cfe | 1457 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1458 | #endif |