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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The IP to API glue. | |
e905a9ed | 7 | * |
1da177e4 LT |
8 | * Authors: see ip.c |
9 | * | |
10 | * Fixes: | |
11 | * Many : Split from ip.c , see ip.c for history. | |
12 | * Martin Mares : TOS setting fixed. | |
e905a9ed | 13 | * Alan Cox : Fixed a couple of oopses in Martin's |
1da177e4 LT |
14 | * TOS tweaks. |
15 | * Mike McLagan : Routing by source | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/mm.h> | |
1da177e4 LT |
21 | #include <linux/skbuff.h> |
22 | #include <linux/ip.h> | |
23 | #include <linux/icmp.h> | |
14c85021 | 24 | #include <linux/inetdevice.h> |
1da177e4 | 25 | #include <linux/netdevice.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 LT |
27 | #include <net/sock.h> |
28 | #include <net/ip.h> | |
29 | #include <net/icmp.h> | |
d83d8461 | 30 | #include <net/tcp_states.h> |
1da177e4 LT |
31 | #include <linux/udp.h> |
32 | #include <linux/igmp.h> | |
33 | #include <linux/netfilter.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/mroute.h> | |
2c67e9ac | 36 | #include <net/inet_ecn.h> |
1da177e4 LT |
37 | #include <net/route.h> |
38 | #include <net/xfrm.h> | |
dae50295 | 39 | #include <net/compat.h> |
ad6f939a | 40 | #include <net/checksum.h> |
dfd56b8b | 41 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
42 | #include <net/transp_v6.h> |
43 | #endif | |
35ebf65e | 44 | #include <net/ip_fib.h> |
1da177e4 LT |
45 | |
46 | #include <linux/errqueue.h> | |
47 | #include <asm/uaccess.h> | |
48 | ||
1da177e4 LT |
49 | /* |
50 | * SOL_IP control messages. | |
51 | */ | |
52 | ||
53 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
54 | { | |
d826eb14 | 55 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 56 | |
eddc9ec5 | 57 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
58 | |
59 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
60 | } | |
61 | ||
62 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
63 | { | |
eddc9ec5 | 64 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
65 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
66 | } | |
67 | ||
68 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
69 | { | |
eddc9ec5 | 70 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
71 | } |
72 | ||
73 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
74 | { | |
75 | if (IPCB(skb)->opt.optlen == 0) | |
76 | return; | |
77 | ||
eddc9ec5 ACM |
78 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
79 | ip_hdr(skb) + 1); | |
1da177e4 LT |
80 | } |
81 | ||
82 | ||
83 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) | |
84 | { | |
85 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 86 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
87 | |
88 | if (IPCB(skb)->opt.optlen == 0) | |
89 | return; | |
90 | ||
91 | if (ip_options_echo(opt, skb)) { | |
92 | msg->msg_flags |= MSG_CTRUNC; | |
93 | return; | |
94 | } | |
95 | ip_options_undo(opt); | |
96 | ||
97 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
98 | } | |
99 | ||
ad6f939a TH |
100 | static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, |
101 | int offset) | |
102 | { | |
103 | __wsum csum = skb->csum; | |
104 | ||
105 | if (skb->ip_summed != CHECKSUM_COMPLETE) | |
106 | return; | |
107 | ||
108 | if (offset != 0) | |
109 | csum = csum_sub(csum, csum_partial(skb->data, offset, 0)); | |
110 | ||
111 | put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); | |
112 | } | |
113 | ||
2c7946a7 CZ |
114 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
115 | { | |
116 | char *secdata; | |
dc49c1f9 | 117 | u32 seclen, secid; |
2c7946a7 CZ |
118 | int err; |
119 | ||
dc49c1f9 CZ |
120 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
121 | if (err) | |
122 | return; | |
123 | ||
124 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
125 | if (err) |
126 | return; | |
127 | ||
128 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 129 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
130 | } |
131 | ||
21d1a161 | 132 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 BS |
133 | { |
134 | struct sockaddr_in sin; | |
b71d1d42 | 135 | const struct iphdr *iph = ip_hdr(skb); |
21d1a161 | 136 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
e8b2dfe9 BS |
137 | |
138 | if (skb_transport_offset(skb) + 4 > skb->len) | |
139 | return; | |
140 | ||
141 | /* All current transport protocols have the port numbers in the | |
142 | * first four bytes of the transport header and this function is | |
143 | * written with this assumption in mind. | |
144 | */ | |
145 | ||
146 | sin.sin_family = AF_INET; | |
147 | sin.sin_addr.s_addr = iph->daddr; | |
148 | sin.sin_port = ports[1]; | |
149 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
150 | ||
151 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
152 | } | |
1da177e4 | 153 | |
5961de9f TH |
154 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, |
155 | int offset) | |
1da177e4 LT |
156 | { |
157 | struct inet_sock *inet = inet_sk(skb->sk); | |
95c96174 | 158 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
159 | |
160 | /* Ordered by supposed usage frequency */ | |
c44d13d6 | 161 | if (flags & IP_CMSG_PKTINFO) { |
1da177e4 | 162 | ip_cmsg_recv_pktinfo(msg, skb); |
1da177e4 | 163 | |
c44d13d6 TH |
164 | flags &= ~IP_CMSG_PKTINFO; |
165 | if (!flags) | |
166 | return; | |
167 | } | |
168 | ||
169 | if (flags & IP_CMSG_TTL) { | |
1da177e4 | 170 | ip_cmsg_recv_ttl(msg, skb); |
1da177e4 | 171 | |
c44d13d6 TH |
172 | flags &= ~IP_CMSG_TTL; |
173 | if (!flags) | |
174 | return; | |
175 | } | |
176 | ||
177 | if (flags & IP_CMSG_TOS) { | |
1da177e4 | 178 | ip_cmsg_recv_tos(msg, skb); |
1da177e4 | 179 | |
c44d13d6 TH |
180 | flags &= ~IP_CMSG_TOS; |
181 | if (!flags) | |
182 | return; | |
183 | } | |
184 | ||
185 | if (flags & IP_CMSG_RECVOPTS) { | |
1da177e4 | 186 | ip_cmsg_recv_opts(msg, skb); |
1da177e4 | 187 | |
c44d13d6 TH |
188 | flags &= ~IP_CMSG_RECVOPTS; |
189 | if (!flags) | |
190 | return; | |
191 | } | |
192 | ||
193 | if (flags & IP_CMSG_RETOPTS) { | |
1da177e4 | 194 | ip_cmsg_recv_retopts(msg, skb); |
2c7946a7 | 195 | |
c44d13d6 TH |
196 | flags &= ~IP_CMSG_RETOPTS; |
197 | if (!flags) | |
198 | return; | |
199 | } | |
200 | ||
201 | if (flags & IP_CMSG_PASSSEC) { | |
2c7946a7 | 202 | ip_cmsg_recv_security(msg, skb); |
e8b2dfe9 | 203 | |
c44d13d6 TH |
204 | flags &= ~IP_CMSG_PASSSEC; |
205 | if (!flags) | |
206 | return; | |
207 | } | |
208 | ||
ad6f939a | 209 | if (flags & IP_CMSG_ORIGDSTADDR) { |
e8b2dfe9 BS |
210 | ip_cmsg_recv_dstaddr(msg, skb); |
211 | ||
ad6f939a TH |
212 | flags &= ~IP_CMSG_ORIGDSTADDR; |
213 | if (!flags) | |
214 | return; | |
215 | } | |
216 | ||
217 | if (flags & IP_CMSG_CHECKSUM) | |
218 | ip_cmsg_recv_checksum(msg, skb, offset); | |
1da177e4 | 219 | } |
5961de9f | 220 | EXPORT_SYMBOL(ip_cmsg_recv_offset); |
1da177e4 | 221 | |
c8e6ad08 HFS |
222 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, |
223 | bool allow_ipv6) | |
1da177e4 | 224 | { |
f02db315 | 225 | int err, val; |
1da177e4 LT |
226 | struct cmsghdr *cmsg; |
227 | ||
f95b414e | 228 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
229 | if (!CMSG_OK(msg, cmsg)) |
230 | return -EINVAL; | |
5337b5b7 | 231 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
232 | if (allow_ipv6 && |
233 | cmsg->cmsg_level == SOL_IPV6 && | |
234 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
235 | struct in6_pktinfo *src_info; | |
236 | ||
237 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
238 | return -EINVAL; | |
239 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
240 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
241 | return -EINVAL; | |
242 | ipc->oif = src_info->ipi6_ifindex; | |
243 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; | |
244 | continue; | |
245 | } | |
246 | #endif | |
1da177e4 LT |
247 | if (cmsg->cmsg_level != SOL_IP) |
248 | continue; | |
249 | switch (cmsg->cmsg_type) { | |
250 | case IP_RETOPTS: | |
251 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
4d52cfbe ED |
252 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
253 | err < 40 ? err : 40); | |
1da177e4 LT |
254 | if (err) |
255 | return err; | |
256 | break; | |
257 | case IP_PKTINFO: | |
258 | { | |
259 | struct in_pktinfo *info; | |
260 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
261 | return -EINVAL; | |
262 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
263 | ipc->oif = info->ipi_ifindex; | |
264 | ipc->addr = info->ipi_spec_dst.s_addr; | |
265 | break; | |
266 | } | |
f02db315 FF |
267 | case IP_TTL: |
268 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
269 | return -EINVAL; | |
270 | val = *(int *)CMSG_DATA(cmsg); | |
271 | if (val < 1 || val > 255) | |
272 | return -EINVAL; | |
273 | ipc->ttl = val; | |
274 | break; | |
275 | case IP_TOS: | |
276 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
277 | return -EINVAL; | |
278 | val = *(int *)CMSG_DATA(cmsg); | |
279 | if (val < 0 || val > 255) | |
280 | return -EINVAL; | |
281 | ipc->tos = val; | |
282 | ipc->priority = rt_tos2priority(ipc->tos); | |
283 | break; | |
284 | ||
1da177e4 LT |
285 | default: |
286 | return -EINVAL; | |
287 | } | |
288 | } | |
289 | return 0; | |
290 | } | |
291 | ||
292 | ||
293 | /* Special input handler for packets caught by router alert option. | |
294 | They are selected only by protocol field, and then processed likely | |
295 | local ones; but only if someone wants them! Otherwise, router | |
296 | not running rsvpd will kill RSVP. | |
297 | ||
298 | It is user level problem, what it will make with them. | |
299 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), | |
300 | but receiver should be enough clever f.e. to forward mtrace requests, | |
301 | sent to multicast group to reach destination designated router. | |
302 | */ | |
43a951e9 | 303 | struct ip_ra_chain __rcu *ip_ra_chain; |
66018506 ED |
304 | static DEFINE_SPINLOCK(ip_ra_lock); |
305 | ||
592fcb9d ED |
306 | |
307 | static void ip_ra_destroy_rcu(struct rcu_head *head) | |
66018506 | 308 | { |
592fcb9d ED |
309 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
310 | ||
311 | sock_put(ra->saved_sk); | |
312 | kfree(ra); | |
66018506 | 313 | } |
1da177e4 | 314 | |
4d52cfbe ED |
315 | int ip_ra_control(struct sock *sk, unsigned char on, |
316 | void (*destructor)(struct sock *)) | |
1da177e4 | 317 | { |
43a951e9 ED |
318 | struct ip_ra_chain *ra, *new_ra; |
319 | struct ip_ra_chain __rcu **rap; | |
1da177e4 | 320 | |
c720c7e8 | 321 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
322 | return -EINVAL; |
323 | ||
324 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
325 | ||
66018506 | 326 | spin_lock_bh(&ip_ra_lock); |
43a951e9 ED |
327 | for (rap = &ip_ra_chain; |
328 | (ra = rcu_dereference_protected(*rap, | |
329 | lockdep_is_held(&ip_ra_lock))) != NULL; | |
330 | rap = &ra->next) { | |
1da177e4 LT |
331 | if (ra->sk == sk) { |
332 | if (on) { | |
66018506 | 333 | spin_unlock_bh(&ip_ra_lock); |
a51482bd | 334 | kfree(new_ra); |
1da177e4 LT |
335 | return -EADDRINUSE; |
336 | } | |
592fcb9d ED |
337 | /* dont let ip_call_ra_chain() use sk again */ |
338 | ra->sk = NULL; | |
8e380f00 | 339 | RCU_INIT_POINTER(*rap, ra->next); |
66018506 | 340 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
341 | |
342 | if (ra->destructor) | |
343 | ra->destructor(sk); | |
592fcb9d ED |
344 | /* |
345 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
346 | * period. This guarantee ip_call_ra_chain() dont need | |
347 | * to mess with socket refcounts. | |
348 | */ | |
349 | ra->saved_sk = sk; | |
350 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
351 | return 0; |
352 | } | |
353 | } | |
354 | if (new_ra == NULL) { | |
66018506 | 355 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
356 | return -ENOBUFS; |
357 | } | |
358 | new_ra->sk = sk; | |
359 | new_ra->destructor = destructor; | |
360 | ||
8e380f00 | 361 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 362 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 363 | sock_hold(sk); |
66018506 | 364 | spin_unlock_bh(&ip_ra_lock); |
1da177e4 LT |
365 | |
366 | return 0; | |
367 | } | |
368 | ||
e905a9ed | 369 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 370 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 371 | { |
1da177e4 LT |
372 | struct sock_exterr_skb *serr; |
373 | ||
1da177e4 LT |
374 | skb = skb_clone(skb, GFP_ATOMIC); |
375 | if (!skb) | |
376 | return; | |
377 | ||
e905a9ed | 378 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
379 | serr->ee.ee_errno = err; |
380 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
381 | serr->ee.ee_type = icmp_hdr(skb)->type; |
382 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
383 | serr->ee.ee_pad = 0; |
384 | serr->ee.ee_info = info; | |
385 | serr->ee.ee_data = 0; | |
88c7664f | 386 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 387 | skb_network_header(skb); |
1da177e4 LT |
388 | serr->port = port; |
389 | ||
bd82393c ACM |
390 | if (skb_pull(skb, payload - skb->data) != NULL) { |
391 | skb_reset_transport_header(skb); | |
392 | if (sock_queue_err_skb(sk, skb) == 0) | |
393 | return; | |
394 | } | |
395 | kfree_skb(skb); | |
1da177e4 LT |
396 | } |
397 | ||
0579016e | 398 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
399 | { |
400 | struct inet_sock *inet = inet_sk(sk); | |
401 | struct sock_exterr_skb *serr; | |
402 | struct iphdr *iph; | |
403 | struct sk_buff *skb; | |
404 | ||
405 | if (!inet->recverr) | |
406 | return; | |
407 | ||
408 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
409 | if (!skb) | |
410 | return; | |
411 | ||
2ca9e6f2 ACM |
412 | skb_put(skb, sizeof(struct iphdr)); |
413 | skb_reset_network_header(skb); | |
eddc9ec5 | 414 | iph = ip_hdr(skb); |
1da177e4 LT |
415 | iph->daddr = daddr; |
416 | ||
e905a9ed | 417 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
418 | serr->ee.ee_errno = err; |
419 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 420 | serr->ee.ee_type = 0; |
1da177e4 LT |
421 | serr->ee.ee_code = 0; |
422 | serr->ee.ee_pad = 0; | |
423 | serr->ee.ee_info = info; | |
424 | serr->ee.ee_data = 0; | |
d56f90a7 | 425 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
426 | serr->port = port; |
427 | ||
27a884dc | 428 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 429 | skb_reset_transport_header(skb); |
1da177e4 LT |
430 | |
431 | if (sock_queue_err_skb(sk, skb)) | |
432 | kfree_skb(skb); | |
433 | } | |
434 | ||
829ae9d6 WB |
435 | static bool ipv4_pktinfo_prepare_errqueue(const struct sock *sk, |
436 | const struct sk_buff *skb, | |
437 | int ee_origin) | |
438 | { | |
439 | struct in_pktinfo *info = PKTINFO_SKB_CB(skb); | |
440 | ||
441 | if ((ee_origin != SO_EE_ORIGIN_TIMESTAMPING) || | |
442 | (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || | |
443 | (!skb->dev)) | |
444 | return false; | |
445 | ||
446 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
447 | info->ipi_ifindex = skb->dev->ifindex; | |
448 | return true; | |
449 | } | |
450 | ||
e905a9ed | 451 | /* |
1da177e4 LT |
452 | * Handle MSG_ERRQUEUE |
453 | */ | |
85fbaa75 | 454 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
455 | { |
456 | struct sock_exterr_skb *serr; | |
364a9e93 | 457 | struct sk_buff *skb; |
342dfc30 | 458 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
459 | struct { |
460 | struct sock_extended_err ee; | |
461 | struct sockaddr_in offender; | |
462 | } errhdr; | |
463 | int err; | |
464 | int copied; | |
465 | ||
7ce875e5 WB |
466 | WARN_ON_ONCE(sk->sk_family == AF_INET6); |
467 | ||
1da177e4 | 468 | err = -EAGAIN; |
364a9e93 | 469 | skb = sock_dequeue_err_skb(sk); |
1da177e4 LT |
470 | if (skb == NULL) |
471 | goto out; | |
472 | ||
473 | copied = skb->len; | |
474 | if (copied > len) { | |
475 | msg->msg_flags |= MSG_TRUNC; | |
476 | copied = len; | |
477 | } | |
51f3d02b | 478 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
479 | if (err) |
480 | goto out_free_skb; | |
481 | ||
482 | sock_recv_timestamp(msg, sk, skb); | |
483 | ||
484 | serr = SKB_EXT_ERR(skb); | |
485 | ||
49ca0d8b | 486 | if (sin && skb->len) { |
1da177e4 | 487 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
488 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
489 | serr->addr_offset); | |
1da177e4 LT |
490 | sin->sin_port = serr->port; |
491 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 492 | *addr_len = sizeof(*sin); |
1da177e4 LT |
493 | } |
494 | ||
495 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
496 | sin = &errhdr.offender; | |
f812116b | 497 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 498 | |
49ca0d8b WB |
499 | if (skb->len && |
500 | (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
501 | ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin))) { | |
1da177e4 | 502 | sin->sin_family = AF_INET; |
eddc9ec5 | 503 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 504 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
505 | ip_cmsg_recv(msg, skb); |
506 | } | |
507 | ||
508 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
509 | ||
510 | /* Now we could try to dump offended packet options */ | |
511 | ||
512 | msg->msg_flags |= MSG_ERRQUEUE; | |
513 | err = copied; | |
514 | ||
e905a9ed | 515 | out_free_skb: |
1da177e4 LT |
516 | kfree_skb(skb); |
517 | out: | |
518 | return err; | |
519 | } | |
520 | ||
521 | ||
522 | /* | |
4d52cfbe ED |
523 | * Socket option code for IP. This is the end of the line after any |
524 | * TCP,UDP etc options on an IP socket. | |
1da177e4 LT |
525 | */ |
526 | ||
3fdadf7d | 527 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 528 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
529 | { |
530 | struct inet_sock *inet = inet_sk(sk); | |
09cb105e | 531 | int val = 0, err; |
1da177e4 | 532 | |
0c9f79be XW |
533 | switch (optname) { |
534 | case IP_PKTINFO: | |
535 | case IP_RECVTTL: | |
536 | case IP_RECVOPTS: | |
537 | case IP_RECVTOS: | |
538 | case IP_RETOPTS: | |
539 | case IP_TOS: | |
540 | case IP_TTL: | |
541 | case IP_HDRINCL: | |
542 | case IP_MTU_DISCOVER: | |
543 | case IP_RECVERR: | |
544 | case IP_ROUTER_ALERT: | |
545 | case IP_FREEBIND: | |
546 | case IP_PASSSEC: | |
547 | case IP_TRANSPARENT: | |
548 | case IP_MINTTL: | |
549 | case IP_NODEFRAG: | |
550 | case IP_UNICAST_IF: | |
551 | case IP_MULTICAST_TTL: | |
552 | case IP_MULTICAST_ALL: | |
553 | case IP_MULTICAST_LOOP: | |
554 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 555 | case IP_CHECKSUM: |
1da177e4 LT |
556 | if (optlen >= sizeof(int)) { |
557 | if (get_user(val, (int __user *) optval)) | |
558 | return -EFAULT; | |
559 | } else if (optlen >= sizeof(char)) { | |
560 | unsigned char ucval; | |
561 | ||
562 | if (get_user(ucval, (unsigned char __user *) optval)) | |
563 | return -EFAULT; | |
564 | val = (int) ucval; | |
565 | } | |
566 | } | |
567 | ||
568 | /* If optlen==0, it is equivalent to val == 0 */ | |
569 | ||
6a9fb947 | 570 | if (ip_mroute_opt(optname)) |
09cb105e | 571 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
572 | |
573 | err = 0; | |
574 | lock_sock(sk); | |
575 | ||
576 | switch (optname) { | |
132adf54 SH |
577 | case IP_OPTIONS: |
578 | { | |
f6d8bd05 ED |
579 | struct ip_options_rcu *old, *opt = NULL; |
580 | ||
65a1c4ff | 581 | if (optlen > 40) |
132adf54 | 582 | goto e_inval; |
3b1e0a65 | 583 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 584 | optval, optlen); |
132adf54 SH |
585 | if (err) |
586 | break; | |
f6d8bd05 ED |
587 | old = rcu_dereference_protected(inet->inet_opt, |
588 | sock_owned_by_user(sk)); | |
132adf54 SH |
589 | if (inet->is_icsk) { |
590 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 591 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
592 | if (sk->sk_family == PF_INET || |
593 | (!((1 << sk->sk_state) & | |
594 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 595 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 596 | #endif |
f6d8bd05 ED |
597 | if (old) |
598 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 599 | if (opt) |
f6d8bd05 | 600 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 601 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 602 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 603 | } |
132adf54 | 604 | #endif |
1da177e4 | 605 | } |
f6d8bd05 ED |
606 | rcu_assign_pointer(inet->inet_opt, opt); |
607 | if (old) | |
605b4afe | 608 | kfree_rcu(old, rcu); |
132adf54 SH |
609 | break; |
610 | } | |
611 | case IP_PKTINFO: | |
612 | if (val) | |
613 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
614 | else | |
615 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
616 | break; | |
617 | case IP_RECVTTL: | |
618 | if (val) | |
619 | inet->cmsg_flags |= IP_CMSG_TTL; | |
620 | else | |
621 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
622 | break; | |
623 | case IP_RECVTOS: | |
624 | if (val) | |
625 | inet->cmsg_flags |= IP_CMSG_TOS; | |
626 | else | |
627 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
628 | break; | |
629 | case IP_RECVOPTS: | |
630 | if (val) | |
631 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
632 | else | |
633 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
634 | break; | |
635 | case IP_RETOPTS: | |
636 | if (val) | |
637 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
638 | else | |
639 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
640 | break; | |
641 | case IP_PASSSEC: | |
642 | if (val) | |
643 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
644 | else | |
645 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
646 | break; | |
e8b2dfe9 BS |
647 | case IP_RECVORIGDSTADDR: |
648 | if (val) | |
649 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
650 | else | |
651 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
652 | break; | |
ad6f939a TH |
653 | case IP_CHECKSUM: |
654 | if (val) { | |
655 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
656 | inet_inc_convert_csum(sk); | |
657 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
658 | } | |
659 | } else { | |
660 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
661 | inet_dec_convert_csum(sk); | |
662 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
663 | } | |
664 | } | |
665 | break; | |
132adf54 SH |
666 | case IP_TOS: /* This sets both TOS and Precedence */ |
667 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
668 | val &= ~INET_ECN_MASK; |
669 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 670 | } |
132adf54 SH |
671 | if (inet->tos != val) { |
672 | inet->tos = val; | |
673 | sk->sk_priority = rt_tos2priority(val); | |
674 | sk_dst_reset(sk); | |
675 | } | |
676 | break; | |
677 | case IP_TTL: | |
4d52cfbe | 678 | if (optlen < 1) |
132adf54 | 679 | goto e_inval; |
c9be4a5c | 680 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
681 | goto e_inval; |
682 | inet->uc_ttl = val; | |
683 | break; | |
684 | case IP_HDRINCL: | |
685 | if (sk->sk_type != SOCK_RAW) { | |
686 | err = -ENOPROTOOPT; | |
2c7946a7 | 687 | break; |
132adf54 SH |
688 | } |
689 | inet->hdrincl = val ? 1 : 0; | |
690 | break; | |
7b2ff18e JO |
691 | case IP_NODEFRAG: |
692 | if (sk->sk_type != SOCK_RAW) { | |
693 | err = -ENOPROTOOPT; | |
694 | break; | |
695 | } | |
696 | inet->nodefrag = val ? 1 : 0; | |
697 | break; | |
132adf54 | 698 | case IP_MTU_DISCOVER: |
1b346576 | 699 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
700 | goto e_inval; |
701 | inet->pmtudisc = val; | |
702 | break; | |
703 | case IP_RECVERR: | |
704 | inet->recverr = !!val; | |
705 | if (!val) | |
706 | skb_queue_purge(&sk->sk_error_queue); | |
707 | break; | |
708 | case IP_MULTICAST_TTL: | |
709 | if (sk->sk_type == SOCK_STREAM) | |
710 | goto e_inval; | |
4d52cfbe | 711 | if (optlen < 1) |
132adf54 | 712 | goto e_inval; |
09cb105e | 713 | if (val == -1) |
132adf54 SH |
714 | val = 1; |
715 | if (val < 0 || val > 255) | |
716 | goto e_inval; | |
717 | inet->mc_ttl = val; | |
718 | break; | |
719 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 720 | if (optlen < 1) |
132adf54 SH |
721 | goto e_inval; |
722 | inet->mc_loop = !!val; | |
723 | break; | |
76e21053 EH |
724 | case IP_UNICAST_IF: |
725 | { | |
726 | struct net_device *dev = NULL; | |
727 | int ifindex; | |
728 | ||
729 | if (optlen != sizeof(int)) | |
730 | goto e_inval; | |
731 | ||
732 | ifindex = (__force int)ntohl((__force __be32)val); | |
733 | if (ifindex == 0) { | |
734 | inet->uc_index = 0; | |
735 | err = 0; | |
736 | break; | |
737 | } | |
738 | ||
739 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
740 | err = -EADDRNOTAVAIL; | |
741 | if (!dev) | |
742 | break; | |
743 | dev_put(dev); | |
744 | ||
745 | err = -EINVAL; | |
746 | if (sk->sk_bound_dev_if) | |
747 | break; | |
748 | ||
749 | inet->uc_index = ifindex; | |
750 | err = 0; | |
751 | break; | |
752 | } | |
132adf54 SH |
753 | case IP_MULTICAST_IF: |
754 | { | |
755 | struct ip_mreqn mreq; | |
756 | struct net_device *dev = NULL; | |
757 | ||
758 | if (sk->sk_type == SOCK_STREAM) | |
759 | goto e_inval; | |
760 | /* | |
761 | * Check the arguments are allowable | |
762 | */ | |
763 | ||
0915921b SW |
764 | if (optlen < sizeof(struct in_addr)) |
765 | goto e_inval; | |
766 | ||
132adf54 SH |
767 | err = -EFAULT; |
768 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 769 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 770 | break; |
132adf54 SH |
771 | } else { |
772 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
773 | if (optlen >= sizeof(struct ip_mreq)) { |
774 | if (copy_from_user(&mreq, optval, | |
775 | sizeof(struct ip_mreq))) | |
776 | break; | |
777 | } else if (optlen >= sizeof(struct in_addr)) { | |
778 | if (copy_from_user(&mreq.imr_address, optval, | |
779 | sizeof(struct in_addr))) | |
780 | break; | |
781 | } | |
132adf54 SH |
782 | } |
783 | ||
784 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 785 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
786 | inet->mc_index = 0; |
787 | inet->mc_addr = 0; | |
788 | err = 0; | |
1da177e4 LT |
789 | break; |
790 | } | |
3b1e0a65 | 791 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 792 | if (dev) |
132adf54 | 793 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 794 | } else |
55b80503 | 795 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 796 | |
1da177e4 | 797 | |
132adf54 SH |
798 | err = -EADDRNOTAVAIL; |
799 | if (!dev) | |
800 | break; | |
55b80503 | 801 | dev_put(dev); |
132adf54 SH |
802 | |
803 | err = -EINVAL; | |
804 | if (sk->sk_bound_dev_if && | |
805 | mreq.imr_ifindex != sk->sk_bound_dev_if) | |
806 | break; | |
1da177e4 | 807 | |
132adf54 SH |
808 | inet->mc_index = mreq.imr_ifindex; |
809 | inet->mc_addr = mreq.imr_address.s_addr; | |
810 | err = 0; | |
811 | break; | |
812 | } | |
1da177e4 | 813 | |
132adf54 SH |
814 | case IP_ADD_MEMBERSHIP: |
815 | case IP_DROP_MEMBERSHIP: | |
816 | { | |
817 | struct ip_mreqn mreq; | |
1da177e4 | 818 | |
a96fb49b FL |
819 | err = -EPROTO; |
820 | if (inet_sk(sk)->is_icsk) | |
821 | break; | |
822 | ||
132adf54 SH |
823 | if (optlen < sizeof(struct ip_mreq)) |
824 | goto e_inval; | |
825 | err = -EFAULT; | |
826 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 827 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 828 | break; |
132adf54 SH |
829 | } else { |
830 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 831 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 832 | break; |
132adf54 | 833 | } |
1da177e4 | 834 | |
132adf54 SH |
835 | if (optname == IP_ADD_MEMBERSHIP) |
836 | err = ip_mc_join_group(sk, &mreq); | |
837 | else | |
838 | err = ip_mc_leave_group(sk, &mreq); | |
839 | break; | |
840 | } | |
841 | case IP_MSFILTER: | |
842 | { | |
132adf54 SH |
843 | struct ip_msfilter *msf; |
844 | ||
845 | if (optlen < IP_MSFILTER_SIZE(0)) | |
846 | goto e_inval; | |
847 | if (optlen > sysctl_optmem_max) { | |
848 | err = -ENOBUFS; | |
1da177e4 LT |
849 | break; |
850 | } | |
132adf54 | 851 | msf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 852 | if (!msf) { |
132adf54 SH |
853 | err = -ENOBUFS; |
854 | break; | |
855 | } | |
856 | err = -EFAULT; | |
857 | if (copy_from_user(msf, optval, optlen)) { | |
858 | kfree(msf); | |
859 | break; | |
860 | } | |
861 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
862 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
863 | msf->imsf_numsrc > sysctl_igmp_max_msf) { | |
864 | kfree(msf); | |
865 | err = -ENOBUFS; | |
866 | break; | |
867 | } | |
868 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
869 | kfree(msf); | |
870 | err = -EINVAL; | |
871 | break; | |
872 | } | |
873 | err = ip_mc_msfilter(sk, msf, 0); | |
874 | kfree(msf); | |
875 | break; | |
876 | } | |
877 | case IP_BLOCK_SOURCE: | |
878 | case IP_UNBLOCK_SOURCE: | |
879 | case IP_ADD_SOURCE_MEMBERSHIP: | |
880 | case IP_DROP_SOURCE_MEMBERSHIP: | |
881 | { | |
882 | struct ip_mreq_source mreqs; | |
883 | int omode, add; | |
1da177e4 | 884 | |
132adf54 SH |
885 | if (optlen != sizeof(struct ip_mreq_source)) |
886 | goto e_inval; | |
887 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 888 | err = -EFAULT; |
1da177e4 LT |
889 | break; |
890 | } | |
132adf54 SH |
891 | if (optname == IP_BLOCK_SOURCE) { |
892 | omode = MCAST_EXCLUDE; | |
893 | add = 1; | |
894 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
895 | omode = MCAST_EXCLUDE; | |
896 | add = 0; | |
897 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
898 | struct ip_mreqn mreq; | |
1da177e4 | 899 | |
132adf54 SH |
900 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
901 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
902 | mreq.imr_ifindex = 0; | |
903 | err = ip_mc_join_group(sk, &mreq); | |
904 | if (err && err != -EADDRINUSE) | |
1da177e4 | 905 | break; |
132adf54 SH |
906 | omode = MCAST_INCLUDE; |
907 | add = 1; | |
908 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
909 | omode = MCAST_INCLUDE; | |
910 | add = 0; | |
911 | } | |
912 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
913 | break; | |
914 | } | |
915 | case MCAST_JOIN_GROUP: | |
916 | case MCAST_LEAVE_GROUP: | |
917 | { | |
918 | struct group_req greq; | |
919 | struct sockaddr_in *psin; | |
920 | struct ip_mreqn mreq; | |
921 | ||
922 | if (optlen < sizeof(struct group_req)) | |
923 | goto e_inval; | |
924 | err = -EFAULT; | |
925 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
926 | break; | |
927 | psin = (struct sockaddr_in *)&greq.gr_group; | |
928 | if (psin->sin_family != AF_INET) | |
929 | goto e_inval; | |
930 | memset(&mreq, 0, sizeof(mreq)); | |
931 | mreq.imr_multiaddr = psin->sin_addr; | |
932 | mreq.imr_ifindex = greq.gr_interface; | |
933 | ||
934 | if (optname == MCAST_JOIN_GROUP) | |
935 | err = ip_mc_join_group(sk, &mreq); | |
936 | else | |
937 | err = ip_mc_leave_group(sk, &mreq); | |
938 | break; | |
939 | } | |
940 | case MCAST_JOIN_SOURCE_GROUP: | |
941 | case MCAST_LEAVE_SOURCE_GROUP: | |
942 | case MCAST_BLOCK_SOURCE: | |
943 | case MCAST_UNBLOCK_SOURCE: | |
944 | { | |
945 | struct group_source_req greqs; | |
946 | struct ip_mreq_source mreqs; | |
947 | struct sockaddr_in *psin; | |
948 | int omode, add; | |
949 | ||
950 | if (optlen != sizeof(struct group_source_req)) | |
951 | goto e_inval; | |
952 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 953 | err = -EFAULT; |
1da177e4 LT |
954 | break; |
955 | } | |
132adf54 SH |
956 | if (greqs.gsr_group.ss_family != AF_INET || |
957 | greqs.gsr_source.ss_family != AF_INET) { | |
958 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
959 | break; |
960 | } | |
132adf54 SH |
961 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
962 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
963 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
964 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
965 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
966 | ||
967 | if (optname == MCAST_BLOCK_SOURCE) { | |
968 | omode = MCAST_EXCLUDE; | |
969 | add = 1; | |
970 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
971 | omode = MCAST_EXCLUDE; | |
972 | add = 0; | |
973 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
974 | struct ip_mreqn mreq; |
975 | ||
132adf54 | 976 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 977 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
978 | mreq.imr_address.s_addr = 0; |
979 | mreq.imr_ifindex = greqs.gsr_interface; | |
980 | err = ip_mc_join_group(sk, &mreq); | |
981 | if (err && err != -EADDRINUSE) | |
982 | break; | |
983 | greqs.gsr_interface = mreq.imr_ifindex; | |
984 | omode = MCAST_INCLUDE; | |
985 | add = 1; | |
986 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
987 | omode = MCAST_INCLUDE; | |
988 | add = 0; | |
989 | } | |
990 | err = ip_mc_source(add, omode, sk, &mreqs, | |
991 | greqs.gsr_interface); | |
992 | break; | |
993 | } | |
994 | case MCAST_MSFILTER: | |
995 | { | |
132adf54 SH |
996 | struct sockaddr_in *psin; |
997 | struct ip_msfilter *msf = NULL; | |
998 | struct group_filter *gsf = NULL; | |
999 | int msize, i, ifindex; | |
1000 | ||
1001 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1002 | goto e_inval; | |
1003 | if (optlen > sysctl_optmem_max) { | |
1004 | err = -ENOBUFS; | |
1da177e4 LT |
1005 | break; |
1006 | } | |
09cb105e | 1007 | gsf = kmalloc(optlen, GFP_KERNEL); |
cfcabdcc | 1008 | if (!gsf) { |
132adf54 | 1009 | err = -ENOBUFS; |
1da177e4 LT |
1010 | break; |
1011 | } | |
132adf54 | 1012 | err = -EFAULT; |
4d52cfbe | 1013 | if (copy_from_user(gsf, optval, optlen)) |
132adf54 | 1014 | goto mc_msf_out; |
4d52cfbe | 1015 | |
132adf54 SH |
1016 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1017 | if (gsf->gf_numsrc >= 0x1ffffff || | |
1018 | gsf->gf_numsrc > sysctl_igmp_max_msf) { | |
1019 | err = -ENOBUFS; | |
1020 | goto mc_msf_out; | |
1021 | } | |
1022 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1023 | err = -EINVAL; | |
1024 | goto mc_msf_out; | |
1025 | } | |
1026 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1027 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1028 | if (!msf) { |
132adf54 SH |
1029 | err = -ENOBUFS; |
1030 | goto mc_msf_out; | |
1031 | } | |
1032 | ifindex = gsf->gf_interface; | |
1033 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1034 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1035 | err = -EADDRNOTAVAIL; |
132adf54 | 1036 | goto mc_msf_out; |
1da177e4 | 1037 | } |
132adf54 SH |
1038 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1039 | msf->imsf_interface = 0; | |
1040 | msf->imsf_fmode = gsf->gf_fmode; | |
1041 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1042 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1043 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1044 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1045 | |
132adf54 SH |
1046 | if (psin->sin_family != AF_INET) |
1047 | goto mc_msf_out; | |
1048 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1049 | } | |
1050 | kfree(gsf); | |
1051 | gsf = NULL; | |
1052 | ||
1053 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1054 | mc_msf_out: |
132adf54 SH |
1055 | kfree(msf); |
1056 | kfree(gsf); | |
1057 | break; | |
1058 | } | |
f771bef9 NS |
1059 | case IP_MULTICAST_ALL: |
1060 | if (optlen < 1) | |
1061 | goto e_inval; | |
1062 | if (val != 0 && val != 1) | |
1063 | goto e_inval; | |
1064 | inet->mc_all = val; | |
1065 | break; | |
132adf54 SH |
1066 | case IP_ROUTER_ALERT: |
1067 | err = ip_ra_control(sk, val ? 1 : 0, NULL); | |
1068 | break; | |
1069 | ||
1070 | case IP_FREEBIND: | |
4d52cfbe | 1071 | if (optlen < 1) |
132adf54 SH |
1072 | goto e_inval; |
1073 | inet->freebind = !!val; | |
1074 | break; | |
1075 | ||
1076 | case IP_IPSEC_POLICY: | |
1077 | case IP_XFRM_POLICY: | |
1078 | err = -EPERM; | |
52e804c6 | 1079 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1080 | break; |
132adf54 SH |
1081 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1082 | break; | |
1da177e4 | 1083 | |
f5715aea | 1084 | case IP_TRANSPARENT: |
52e804c6 EB |
1085 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1086 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1087 | err = -EPERM; |
1088 | break; | |
1089 | } | |
1090 | if (optlen < 1) | |
1091 | goto e_inval; | |
1092 | inet->transparent = !!val; | |
1093 | break; | |
1094 | ||
d218d111 SH |
1095 | case IP_MINTTL: |
1096 | if (optlen < 1) | |
1097 | goto e_inval; | |
1098 | if (val < 0 || val > 255) | |
1099 | goto e_inval; | |
1100 | inet->min_ttl = val; | |
1101 | break; | |
1102 | ||
132adf54 SH |
1103 | default: |
1104 | err = -ENOPROTOOPT; | |
1105 | break; | |
1da177e4 LT |
1106 | } |
1107 | release_sock(sk); | |
1108 | return err; | |
1109 | ||
1110 | e_inval: | |
1111 | release_sock(sk); | |
1112 | return -EINVAL; | |
1113 | } | |
1114 | ||
f84af32c | 1115 | /** |
829ae9d6 | 1116 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1117 | * @sk: socket |
1118 | * @skb: buffer | |
1119 | * | |
35ebf65e DM |
1120 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1121 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1122 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1123 | */ |
fbf8866d | 1124 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1125 | { |
d826eb14 | 1126 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1127 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1128 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1129 | |
4b261c75 | 1130 | if (prepare && skb_rtable(skb)) { |
92101b3b | 1131 | pktinfo->ipi_ifindex = inet_iif(skb); |
35ebf65e | 1132 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1133 | } else { |
1134 | pktinfo->ipi_ifindex = 0; | |
1135 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1136 | } | |
1137 | skb_dst_drop(skb); | |
f84af32c | 1138 | } |
f84af32c | 1139 | |
3fdadf7d | 1140 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1141 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1142 | { |
1143 | int err; | |
1144 | ||
1145 | if (level != SOL_IP) | |
1146 | return -ENOPROTOOPT; | |
1147 | ||
1148 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
1149 | #ifdef CONFIG_NETFILTER | |
1150 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1151 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1152 | optname != IP_IPSEC_POLICY && |
1153 | optname != IP_XFRM_POLICY && | |
1154 | !ip_mroute_opt(optname)) { | |
3fdadf7d DM |
1155 | lock_sock(sk); |
1156 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); | |
1157 | release_sock(sk); | |
1158 | } | |
1159 | #endif | |
1160 | return err; | |
1161 | } | |
4d52cfbe | 1162 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1163 | |
1164 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1165 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1166 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1167 | { |
1168 | int err; | |
1169 | ||
1170 | if (level != SOL_IP) | |
1171 | return -ENOPROTOOPT; | |
1172 | ||
dae50295 DS |
1173 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1174 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1175 | ip_setsockopt); | |
1176 | ||
3fdadf7d DM |
1177 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1178 | #ifdef CONFIG_NETFILTER | |
1179 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1180 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1181 | optname != IP_IPSEC_POLICY && |
1182 | optname != IP_XFRM_POLICY && | |
1183 | !ip_mroute_opt(optname)) { | |
3fdadf7d | 1184 | lock_sock(sk); |
543d9cfe ACM |
1185 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
1186 | optval, optlen); | |
3fdadf7d DM |
1187 | release_sock(sk); |
1188 | } | |
1189 | #endif | |
1190 | return err; | |
1191 | } | |
543d9cfe | 1192 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1193 | #endif |
1194 | ||
1da177e4 | 1195 | /* |
4d52cfbe ED |
1196 | * Get the options. Note for future reference. The GET of IP options gets |
1197 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1198 | */ |
1199 | ||
3fdadf7d | 1200 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1201 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1202 | { |
1203 | struct inet_sock *inet = inet_sk(sk); | |
1204 | int val; | |
1205 | int len; | |
e905a9ed | 1206 | |
132adf54 | 1207 | if (level != SOL_IP) |
1da177e4 LT |
1208 | return -EOPNOTSUPP; |
1209 | ||
6a9fb947 | 1210 | if (ip_mroute_opt(optname)) |
09cb105e | 1211 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1212 | |
09cb105e | 1213 | if (get_user(len, optlen)) |
1da177e4 | 1214 | return -EFAULT; |
132adf54 | 1215 | if (len < 0) |
1da177e4 | 1216 | return -EINVAL; |
e905a9ed | 1217 | |
1da177e4 LT |
1218 | lock_sock(sk); |
1219 | ||
132adf54 SH |
1220 | switch (optname) { |
1221 | case IP_OPTIONS: | |
1222 | { | |
1223 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1224 | struct ip_options *opt = (struct ip_options *)optbuf; |
1225 | struct ip_options_rcu *inet_opt; | |
1226 | ||
1227 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1228 | sock_owned_by_user(sk)); | |
132adf54 | 1229 | opt->optlen = 0; |
f6d8bd05 ED |
1230 | if (inet_opt) |
1231 | memcpy(optbuf, &inet_opt->opt, | |
1232 | sizeof(struct ip_options) + | |
1233 | inet_opt->opt.optlen); | |
132adf54 SH |
1234 | release_sock(sk); |
1235 | ||
1236 | if (opt->optlen == 0) | |
1237 | return put_user(0, optlen); | |
1238 | ||
1239 | ip_options_undo(opt); | |
1240 | ||
1241 | len = min_t(unsigned int, len, opt->optlen); | |
1242 | if (put_user(len, optlen)) | |
1243 | return -EFAULT; | |
1244 | if (copy_to_user(optval, opt->__data, len)) | |
1245 | return -EFAULT; | |
1246 | return 0; | |
1247 | } | |
1248 | case IP_PKTINFO: | |
1249 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1250 | break; | |
1251 | case IP_RECVTTL: | |
1252 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1253 | break; | |
1254 | case IP_RECVTOS: | |
1255 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1256 | break; | |
1257 | case IP_RECVOPTS: | |
1258 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1259 | break; | |
1260 | case IP_RETOPTS: | |
1261 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1262 | break; | |
1263 | case IP_PASSSEC: | |
1264 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1265 | break; | |
e8b2dfe9 BS |
1266 | case IP_RECVORIGDSTADDR: |
1267 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1268 | break; | |
ad6f939a TH |
1269 | case IP_CHECKSUM: |
1270 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1271 | break; | |
132adf54 SH |
1272 | case IP_TOS: |
1273 | val = inet->tos; | |
1274 | break; | |
1275 | case IP_TTL: | |
1276 | val = (inet->uc_ttl == -1 ? | |
1277 | sysctl_ip_default_ttl : | |
1278 | inet->uc_ttl); | |
1279 | break; | |
1280 | case IP_HDRINCL: | |
1281 | val = inet->hdrincl; | |
1282 | break; | |
a89b4763 MK |
1283 | case IP_NODEFRAG: |
1284 | val = inet->nodefrag; | |
1285 | break; | |
132adf54 SH |
1286 | case IP_MTU_DISCOVER: |
1287 | val = inet->pmtudisc; | |
1288 | break; | |
1289 | case IP_MTU: | |
1290 | { | |
1291 | struct dst_entry *dst; | |
1292 | val = 0; | |
1293 | dst = sk_dst_get(sk); | |
1294 | if (dst) { | |
1295 | val = dst_mtu(dst); | |
1296 | dst_release(dst); | |
1da177e4 | 1297 | } |
132adf54 | 1298 | if (!val) { |
1da177e4 | 1299 | release_sock(sk); |
132adf54 | 1300 | return -ENOTCONN; |
1da177e4 | 1301 | } |
132adf54 SH |
1302 | break; |
1303 | } | |
1304 | case IP_RECVERR: | |
1305 | val = inet->recverr; | |
1306 | break; | |
1307 | case IP_MULTICAST_TTL: | |
1308 | val = inet->mc_ttl; | |
1309 | break; | |
1310 | case IP_MULTICAST_LOOP: | |
1311 | val = inet->mc_loop; | |
1312 | break; | |
76e21053 EH |
1313 | case IP_UNICAST_IF: |
1314 | val = (__force int)htonl((__u32) inet->uc_index); | |
1315 | break; | |
132adf54 SH |
1316 | case IP_MULTICAST_IF: |
1317 | { | |
1318 | struct in_addr addr; | |
1319 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1320 | addr.s_addr = inet->mc_addr; | |
1321 | release_sock(sk); | |
1da177e4 | 1322 | |
132adf54 SH |
1323 | if (put_user(len, optlen)) |
1324 | return -EFAULT; | |
1325 | if (copy_to_user(optval, &addr, len)) | |
1326 | return -EFAULT; | |
1327 | return 0; | |
1328 | } | |
1329 | case IP_MSFILTER: | |
1330 | { | |
1331 | struct ip_msfilter msf; | |
1332 | int err; | |
1333 | ||
1334 | if (len < IP_MSFILTER_SIZE(0)) { | |
1da177e4 | 1335 | release_sock(sk); |
132adf54 | 1336 | return -EINVAL; |
1da177e4 | 1337 | } |
132adf54 | 1338 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
1da177e4 | 1339 | release_sock(sk); |
132adf54 | 1340 | return -EFAULT; |
1da177e4 | 1341 | } |
132adf54 SH |
1342 | err = ip_mc_msfget(sk, &msf, |
1343 | (struct ip_msfilter __user *)optval, optlen); | |
1344 | release_sock(sk); | |
1345 | return err; | |
1346 | } | |
1347 | case MCAST_MSFILTER: | |
1348 | { | |
1349 | struct group_filter gsf; | |
1350 | int err; | |
1da177e4 | 1351 | |
132adf54 | 1352 | if (len < GROUP_FILTER_SIZE(0)) { |
1da177e4 | 1353 | release_sock(sk); |
132adf54 SH |
1354 | return -EINVAL; |
1355 | } | |
1356 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
1357 | release_sock(sk); | |
1358 | return -EFAULT; | |
1359 | } | |
1360 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1361 | (struct group_filter __user *)optval, |
1362 | optlen); | |
132adf54 SH |
1363 | release_sock(sk); |
1364 | return err; | |
1365 | } | |
f771bef9 NS |
1366 | case IP_MULTICAST_ALL: |
1367 | val = inet->mc_all; | |
1368 | break; | |
132adf54 SH |
1369 | case IP_PKTOPTIONS: |
1370 | { | |
1371 | struct msghdr msg; | |
1da177e4 | 1372 | |
132adf54 | 1373 | release_sock(sk); |
1da177e4 | 1374 | |
132adf54 SH |
1375 | if (sk->sk_type != SOCK_STREAM) |
1376 | return -ENOPROTOOPT; | |
1da177e4 | 1377 | |
c54a5e02 | 1378 | msg.msg_control = (__force void *) optval; |
132adf54 | 1379 | msg.msg_controllen = len; |
dd23198e | 1380 | msg.msg_flags = flags; |
1da177e4 | 1381 | |
132adf54 SH |
1382 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1383 | struct in_pktinfo info; | |
1384 | ||
c720c7e8 ED |
1385 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1386 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1387 | info.ipi_ifindex = inet->mc_index; |
1388 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1389 | } |
132adf54 SH |
1390 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1391 | int hlim = inet->mc_ttl; | |
1392 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1393 | } | |
4c507d28 JB |
1394 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1395 | int tos = inet->rcv_tos; | |
1396 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1397 | } | |
132adf54 SH |
1398 | len -= msg.msg_controllen; |
1399 | return put_user(len, optlen); | |
1400 | } | |
1401 | case IP_FREEBIND: | |
1402 | val = inet->freebind; | |
1403 | break; | |
f5715aea KK |
1404 | case IP_TRANSPARENT: |
1405 | val = inet->transparent; | |
1406 | break; | |
d218d111 SH |
1407 | case IP_MINTTL: |
1408 | val = inet->min_ttl; | |
1409 | break; | |
132adf54 SH |
1410 | default: |
1411 | release_sock(sk); | |
1412 | return -ENOPROTOOPT; | |
1da177e4 LT |
1413 | } |
1414 | release_sock(sk); | |
e905a9ed | 1415 | |
4d52cfbe | 1416 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1417 | unsigned char ucval = (unsigned char)val; |
1418 | len = 1; | |
132adf54 | 1419 | if (put_user(len, optlen)) |
1da177e4 | 1420 | return -EFAULT; |
09cb105e | 1421 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1422 | return -EFAULT; |
1423 | } else { | |
1424 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1425 | if (put_user(len, optlen)) |
1da177e4 | 1426 | return -EFAULT; |
09cb105e | 1427 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1428 | return -EFAULT; |
1429 | } | |
1430 | return 0; | |
1431 | } | |
1432 | ||
3fdadf7d | 1433 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1434 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1435 | { |
1436 | int err; | |
1437 | ||
dd23198e | 1438 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
3fdadf7d DM |
1439 | #ifdef CONFIG_NETFILTER |
1440 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1441 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1442 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1443 | int len; |
3fdadf7d | 1444 | |
09cb105e | 1445 | if (get_user(len, optlen)) |
3fdadf7d DM |
1446 | return -EFAULT; |
1447 | ||
1448 | lock_sock(sk); | |
1449 | err = nf_getsockopt(sk, PF_INET, optname, optval, | |
1450 | &len); | |
1451 | release_sock(sk); | |
1452 | if (err >= 0) | |
1453 | err = put_user(len, optlen); | |
1454 | return err; | |
1455 | } | |
1456 | #endif | |
1457 | return err; | |
1458 | } | |
4d52cfbe | 1459 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1460 | |
1461 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1462 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1463 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1464 | { |
42908c69 DS |
1465 | int err; |
1466 | ||
1467 | if (optname == MCAST_MSFILTER) | |
1468 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1469 | ip_getsockopt); | |
1470 | ||
dd23198e DB |
1471 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1472 | MSG_CMSG_COMPAT); | |
42908c69 | 1473 | |
3fdadf7d DM |
1474 | #ifdef CONFIG_NETFILTER |
1475 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1476 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1477 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1478 | int len; |
3fdadf7d | 1479 | |
543d9cfe | 1480 | if (get_user(len, optlen)) |
3fdadf7d DM |
1481 | return -EFAULT; |
1482 | ||
1483 | lock_sock(sk); | |
543d9cfe | 1484 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1485 | release_sock(sk); |
1486 | if (err >= 0) | |
1487 | err = put_user(len, optlen); | |
1488 | return err; | |
1489 | } | |
1490 | #endif | |
1491 | return err; | |
1492 | } | |
543d9cfe | 1493 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1494 | #endif |