Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * The IP to API glue. | |
e905a9ed | 8 | * |
1da177e4 LT |
9 | * Authors: see ip.c |
10 | * | |
11 | * Fixes: | |
12 | * Many : Split from ip.c , see ip.c for history. | |
13 | * Martin Mares : TOS setting fixed. | |
e905a9ed | 14 | * Alan Cox : Fixed a couple of oopses in Martin's |
1da177e4 LT |
15 | * TOS tweaks. |
16 | * Mike McLagan : Routing by source | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/types.h> | |
21 | #include <linux/mm.h> | |
1da177e4 LT |
22 | #include <linux/skbuff.h> |
23 | #include <linux/ip.h> | |
24 | #include <linux/icmp.h> | |
14c85021 | 25 | #include <linux/inetdevice.h> |
1da177e4 | 26 | #include <linux/netdevice.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
1da177e4 LT |
28 | #include <net/sock.h> |
29 | #include <net/ip.h> | |
30 | #include <net/icmp.h> | |
d83d8461 | 31 | #include <net/tcp_states.h> |
1da177e4 LT |
32 | #include <linux/udp.h> |
33 | #include <linux/igmp.h> | |
34 | #include <linux/netfilter.h> | |
35 | #include <linux/route.h> | |
36 | #include <linux/mroute.h> | |
2c67e9ac | 37 | #include <net/inet_ecn.h> |
1da177e4 LT |
38 | #include <net/route.h> |
39 | #include <net/xfrm.h> | |
dae50295 | 40 | #include <net/compat.h> |
ad6f939a | 41 | #include <net/checksum.h> |
dfd56b8b | 42 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
43 | #include <net/transp_v6.h> |
44 | #endif | |
35ebf65e | 45 | #include <net/ip_fib.h> |
1da177e4 LT |
46 | |
47 | #include <linux/errqueue.h> | |
7c0f6ba6 | 48 | #include <linux/uaccess.h> |
1da177e4 | 49 | |
d2ba09c1 AS |
50 | #include <linux/bpfilter.h> |
51 | ||
1da177e4 LT |
52 | /* |
53 | * SOL_IP control messages. | |
54 | */ | |
55 | ||
56 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
57 | { | |
d826eb14 | 58 | struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
1da177e4 | 59 | |
eddc9ec5 | 60 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
1da177e4 LT |
61 | |
62 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
63 | } | |
64 | ||
65 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) | |
66 | { | |
eddc9ec5 | 67 | int ttl = ip_hdr(skb)->ttl; |
1da177e4 LT |
68 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
69 | } | |
70 | ||
71 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) | |
72 | { | |
eddc9ec5 | 73 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
1da177e4 LT |
74 | } |
75 | ||
76 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) | |
77 | { | |
78 | if (IPCB(skb)->opt.optlen == 0) | |
79 | return; | |
80 | ||
eddc9ec5 ACM |
81 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
82 | ip_hdr(skb) + 1); | |
1da177e4 LT |
83 | } |
84 | ||
85 | ||
91ed1e66 PA |
86 | static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, |
87 | struct sk_buff *skb) | |
1da177e4 LT |
88 | { |
89 | unsigned char optbuf[sizeof(struct ip_options) + 40]; | |
5e73ea1a | 90 | struct ip_options *opt = (struct ip_options *)optbuf; |
1da177e4 LT |
91 | |
92 | if (IPCB(skb)->opt.optlen == 0) | |
93 | return; | |
94 | ||
91ed1e66 | 95 | if (ip_options_echo(net, opt, skb)) { |
1da177e4 LT |
96 | msg->msg_flags |= MSG_CTRUNC; |
97 | return; | |
98 | } | |
99 | ip_options_undo(opt); | |
100 | ||
101 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); | |
102 | } | |
103 | ||
70ecc248 WB |
104 | static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) |
105 | { | |
106 | int val; | |
107 | ||
108 | if (IPCB(skb)->frag_max_size == 0) | |
109 | return; | |
110 | ||
111 | val = IPCB(skb)->frag_max_size; | |
112 | put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); | |
113 | } | |
114 | ||
ad6f939a | 115 | static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, |
10df8e61 | 116 | int tlen, int offset) |
ad6f939a TH |
117 | { |
118 | __wsum csum = skb->csum; | |
119 | ||
120 | if (skb->ip_summed != CHECKSUM_COMPLETE) | |
121 | return; | |
122 | ||
ca4ef457 PA |
123 | if (offset != 0) { |
124 | int tend_off = skb_transport_offset(skb) + tlen; | |
125 | csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); | |
126 | } | |
ad6f939a TH |
127 | |
128 | put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); | |
129 | } | |
130 | ||
2c7946a7 CZ |
131 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
132 | { | |
133 | char *secdata; | |
dc49c1f9 | 134 | u32 seclen, secid; |
2c7946a7 CZ |
135 | int err; |
136 | ||
dc49c1f9 CZ |
137 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
138 | if (err) | |
139 | return; | |
140 | ||
141 | err = security_secid_to_secctx(secid, &secdata, &seclen); | |
2c7946a7 CZ |
142 | if (err) |
143 | return; | |
144 | ||
145 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); | |
dc49c1f9 | 146 | security_release_secctx(secdata, seclen); |
2c7946a7 CZ |
147 | } |
148 | ||
21d1a161 | 149 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
e8b2dfe9 | 150 | { |
4a06fa67 | 151 | __be16 _ports[2], *ports; |
e8b2dfe9 | 152 | struct sockaddr_in sin; |
e8b2dfe9 BS |
153 | |
154 | /* All current transport protocols have the port numbers in the | |
155 | * first four bytes of the transport header and this function is | |
156 | * written with this assumption in mind. | |
157 | */ | |
4a06fa67 WB |
158 | ports = skb_header_pointer(skb, skb_transport_offset(skb), |
159 | sizeof(_ports), &_ports); | |
160 | if (!ports) | |
161 | return; | |
e8b2dfe9 BS |
162 | |
163 | sin.sin_family = AF_INET; | |
64199fc0 | 164 | sin.sin_addr.s_addr = ip_hdr(skb)->daddr; |
e8b2dfe9 BS |
165 | sin.sin_port = ports[1]; |
166 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); | |
167 | ||
168 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); | |
169 | } | |
1da177e4 | 170 | |
ad959036 PA |
171 | void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
172 | struct sk_buff *skb, int tlen, int offset) | |
1da177e4 | 173 | { |
ad959036 | 174 | struct inet_sock *inet = inet_sk(sk); |
95c96174 | 175 | unsigned int flags = inet->cmsg_flags; |
1da177e4 LT |
176 | |
177 | /* Ordered by supposed usage frequency */ | |
c44d13d6 | 178 | if (flags & IP_CMSG_PKTINFO) { |
1da177e4 | 179 | ip_cmsg_recv_pktinfo(msg, skb); |
1da177e4 | 180 | |
c44d13d6 TH |
181 | flags &= ~IP_CMSG_PKTINFO; |
182 | if (!flags) | |
183 | return; | |
184 | } | |
185 | ||
186 | if (flags & IP_CMSG_TTL) { | |
1da177e4 | 187 | ip_cmsg_recv_ttl(msg, skb); |
1da177e4 | 188 | |
c44d13d6 TH |
189 | flags &= ~IP_CMSG_TTL; |
190 | if (!flags) | |
191 | return; | |
192 | } | |
193 | ||
194 | if (flags & IP_CMSG_TOS) { | |
1da177e4 | 195 | ip_cmsg_recv_tos(msg, skb); |
1da177e4 | 196 | |
c44d13d6 TH |
197 | flags &= ~IP_CMSG_TOS; |
198 | if (!flags) | |
199 | return; | |
200 | } | |
201 | ||
202 | if (flags & IP_CMSG_RECVOPTS) { | |
1da177e4 | 203 | ip_cmsg_recv_opts(msg, skb); |
1da177e4 | 204 | |
c44d13d6 TH |
205 | flags &= ~IP_CMSG_RECVOPTS; |
206 | if (!flags) | |
207 | return; | |
208 | } | |
209 | ||
210 | if (flags & IP_CMSG_RETOPTS) { | |
91ed1e66 | 211 | ip_cmsg_recv_retopts(sock_net(sk), msg, skb); |
2c7946a7 | 212 | |
c44d13d6 TH |
213 | flags &= ~IP_CMSG_RETOPTS; |
214 | if (!flags) | |
215 | return; | |
216 | } | |
217 | ||
218 | if (flags & IP_CMSG_PASSSEC) { | |
2c7946a7 | 219 | ip_cmsg_recv_security(msg, skb); |
e8b2dfe9 | 220 | |
c44d13d6 TH |
221 | flags &= ~IP_CMSG_PASSSEC; |
222 | if (!flags) | |
223 | return; | |
224 | } | |
225 | ||
ad6f939a | 226 | if (flags & IP_CMSG_ORIGDSTADDR) { |
e8b2dfe9 BS |
227 | ip_cmsg_recv_dstaddr(msg, skb); |
228 | ||
ad6f939a TH |
229 | flags &= ~IP_CMSG_ORIGDSTADDR; |
230 | if (!flags) | |
231 | return; | |
232 | } | |
233 | ||
234 | if (flags & IP_CMSG_CHECKSUM) | |
10df8e61 | 235 | ip_cmsg_recv_checksum(msg, skb, tlen, offset); |
70ecc248 WB |
236 | |
237 | if (flags & IP_CMSG_RECVFRAGSIZE) | |
238 | ip_cmsg_recv_fragsize(msg, skb); | |
1da177e4 | 239 | } |
5961de9f | 240 | EXPORT_SYMBOL(ip_cmsg_recv_offset); |
1da177e4 | 241 | |
24025c46 | 242 | int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, |
c8e6ad08 | 243 | bool allow_ipv6) |
1da177e4 | 244 | { |
f02db315 | 245 | int err, val; |
1da177e4 | 246 | struct cmsghdr *cmsg; |
24025c46 | 247 | struct net *net = sock_net(sk); |
1da177e4 | 248 | |
f95b414e | 249 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 LT |
250 | if (!CMSG_OK(msg, cmsg)) |
251 | return -EINVAL; | |
5337b5b7 | 252 | #if IS_ENABLED(CONFIG_IPV6) |
c8e6ad08 HFS |
253 | if (allow_ipv6 && |
254 | cmsg->cmsg_level == SOL_IPV6 && | |
255 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
256 | struct in6_pktinfo *src_info; | |
257 | ||
258 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) | |
259 | return -EINVAL; | |
260 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
261 | if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) | |
262 | return -EINVAL; | |
1cbec076 DA |
263 | if (src_info->ipi6_ifindex) |
264 | ipc->oif = src_info->ipi6_ifindex; | |
c8e6ad08 HFS |
265 | ipc->addr = src_info->ipi6_addr.s6_addr32[3]; |
266 | continue; | |
267 | } | |
268 | #endif | |
24025c46 | 269 | if (cmsg->cmsg_level == SOL_SOCKET) { |
2632616b ED |
270 | err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); |
271 | if (err) | |
272 | return err; | |
24025c46 SHY |
273 | continue; |
274 | } | |
275 | ||
1da177e4 LT |
276 | if (cmsg->cmsg_level != SOL_IP) |
277 | continue; | |
278 | switch (cmsg->cmsg_type) { | |
279 | case IP_RETOPTS: | |
1ff8cebf | 280 | err = cmsg->cmsg_len - sizeof(struct cmsghdr); |
91948309 ED |
281 | |
282 | /* Our caller is responsible for freeing ipc->opt */ | |
4d52cfbe ED |
283 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
284 | err < 40 ? err : 40); | |
1da177e4 LT |
285 | if (err) |
286 | return err; | |
287 | break; | |
288 | case IP_PKTINFO: | |
289 | { | |
290 | struct in_pktinfo *info; | |
291 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) | |
292 | return -EINVAL; | |
293 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
1cbec076 DA |
294 | if (info->ipi_ifindex) |
295 | ipc->oif = info->ipi_ifindex; | |
1da177e4 LT |
296 | ipc->addr = info->ipi_spec_dst.s_addr; |
297 | break; | |
298 | } | |
f02db315 FF |
299 | case IP_TTL: |
300 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) | |
301 | return -EINVAL; | |
302 | val = *(int *)CMSG_DATA(cmsg); | |
303 | if (val < 1 || val > 255) | |
304 | return -EINVAL; | |
305 | ipc->ttl = val; | |
306 | break; | |
307 | case IP_TOS: | |
e895cdce ED |
308 | if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) |
309 | val = *(int *)CMSG_DATA(cmsg); | |
310 | else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) | |
311 | val = *(u8 *)CMSG_DATA(cmsg); | |
312 | else | |
f02db315 | 313 | return -EINVAL; |
f02db315 FF |
314 | if (val < 0 || val > 255) |
315 | return -EINVAL; | |
316 | ipc->tos = val; | |
317 | ipc->priority = rt_tos2priority(ipc->tos); | |
318 | break; | |
319 | ||
1da177e4 LT |
320 | default: |
321 | return -EINVAL; | |
322 | } | |
323 | } | |
324 | return 0; | |
325 | } | |
326 | ||
592fcb9d | 327 | static void ip_ra_destroy_rcu(struct rcu_head *head) |
66018506 | 328 | { |
592fcb9d ED |
329 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
330 | ||
331 | sock_put(ra->saved_sk); | |
332 | kfree(ra); | |
66018506 | 333 | } |
1da177e4 | 334 | |
4d52cfbe ED |
335 | int ip_ra_control(struct sock *sk, unsigned char on, |
336 | void (*destructor)(struct sock *)) | |
1da177e4 | 337 | { |
43a951e9 ED |
338 | struct ip_ra_chain *ra, *new_ra; |
339 | struct ip_ra_chain __rcu **rap; | |
5796ef75 | 340 | struct net *net = sock_net(sk); |
1da177e4 | 341 | |
c720c7e8 | 342 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
1da177e4 LT |
343 | return -EINVAL; |
344 | ||
345 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; | |
425aa0e1 GZ |
346 | if (on && !new_ra) |
347 | return -ENOMEM; | |
1da177e4 | 348 | |
d9ff3049 | 349 | mutex_lock(&net->ipv4.ra_mutex); |
5796ef75 | 350 | for (rap = &net->ipv4.ra_chain; |
76d3e153 | 351 | (ra = rcu_dereference_protected(*rap, |
d9ff3049 | 352 | lockdep_is_held(&net->ipv4.ra_mutex))) != NULL; |
43a951e9 | 353 | rap = &ra->next) { |
1da177e4 LT |
354 | if (ra->sk == sk) { |
355 | if (on) { | |
d9ff3049 | 356 | mutex_unlock(&net->ipv4.ra_mutex); |
a51482bd | 357 | kfree(new_ra); |
1da177e4 LT |
358 | return -EADDRINUSE; |
359 | } | |
592fcb9d ED |
360 | /* dont let ip_call_ra_chain() use sk again */ |
361 | ra->sk = NULL; | |
8e380f00 | 362 | RCU_INIT_POINTER(*rap, ra->next); |
d9ff3049 | 363 | mutex_unlock(&net->ipv4.ra_mutex); |
1da177e4 LT |
364 | |
365 | if (ra->destructor) | |
366 | ra->destructor(sk); | |
592fcb9d ED |
367 | /* |
368 | * Delay sock_put(sk) and kfree(ra) after one rcu grace | |
369 | * period. This guarantee ip_call_ra_chain() dont need | |
370 | * to mess with socket refcounts. | |
371 | */ | |
372 | ra->saved_sk = sk; | |
373 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); | |
1da177e4 LT |
374 | return 0; |
375 | } | |
376 | } | |
76d3e153 | 377 | if (!new_ra) { |
d9ff3049 | 378 | mutex_unlock(&net->ipv4.ra_mutex); |
1da177e4 | 379 | return -ENOBUFS; |
76d3e153 | 380 | } |
1da177e4 LT |
381 | new_ra->sk = sk; |
382 | new_ra->destructor = destructor; | |
383 | ||
8e380f00 | 384 | RCU_INIT_POINTER(new_ra->next, ra); |
66018506 | 385 | rcu_assign_pointer(*rap, new_ra); |
1da177e4 | 386 | sock_hold(sk); |
d9ff3049 | 387 | mutex_unlock(&net->ipv4.ra_mutex); |
1da177e4 LT |
388 | |
389 | return 0; | |
390 | } | |
391 | ||
e905a9ed | 392 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
35986b32 | 393 | __be16 port, u32 info, u8 *payload) |
1da177e4 | 394 | { |
1da177e4 LT |
395 | struct sock_exterr_skb *serr; |
396 | ||
1da177e4 LT |
397 | skb = skb_clone(skb, GFP_ATOMIC); |
398 | if (!skb) | |
399 | return; | |
400 | ||
e905a9ed | 401 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
402 | serr->ee.ee_errno = err; |
403 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; | |
88c7664f ACM |
404 | serr->ee.ee_type = icmp_hdr(skb)->type; |
405 | serr->ee.ee_code = icmp_hdr(skb)->code; | |
1da177e4 LT |
406 | serr->ee.ee_pad = 0; |
407 | serr->ee.ee_info = info; | |
408 | serr->ee.ee_data = 0; | |
88c7664f | 409 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
d56f90a7 | 410 | skb_network_header(skb); |
1da177e4 LT |
411 | serr->port = port; |
412 | ||
00db4124 | 413 | if (skb_pull(skb, payload - skb->data)) { |
bd82393c ACM |
414 | skb_reset_transport_header(skb); |
415 | if (sock_queue_err_skb(sk, skb) == 0) | |
416 | return; | |
417 | } | |
418 | kfree_skb(skb); | |
1da177e4 LT |
419 | } |
420 | ||
0579016e | 421 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
422 | { |
423 | struct inet_sock *inet = inet_sk(sk); | |
424 | struct sock_exterr_skb *serr; | |
425 | struct iphdr *iph; | |
426 | struct sk_buff *skb; | |
427 | ||
428 | if (!inet->recverr) | |
429 | return; | |
430 | ||
431 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
432 | if (!skb) | |
433 | return; | |
434 | ||
2ca9e6f2 ACM |
435 | skb_put(skb, sizeof(struct iphdr)); |
436 | skb_reset_network_header(skb); | |
eddc9ec5 | 437 | iph = ip_hdr(skb); |
1da177e4 LT |
438 | iph->daddr = daddr; |
439 | ||
e905a9ed | 440 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
441 | serr->ee.ee_errno = err; |
442 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 443 | serr->ee.ee_type = 0; |
1da177e4 LT |
444 | serr->ee.ee_code = 0; |
445 | serr->ee.ee_pad = 0; | |
446 | serr->ee.ee_info = info; | |
447 | serr->ee.ee_data = 0; | |
d56f90a7 | 448 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
449 | serr->port = port; |
450 | ||
27a884dc | 451 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 452 | skb_reset_transport_header(skb); |
1da177e4 LT |
453 | |
454 | if (sock_queue_err_skb(sk, skb)) | |
455 | kfree_skb(skb); | |
456 | } | |
457 | ||
34b99df4 JA |
458 | /* For some errors we have valid addr_offset even with zero payload and |
459 | * zero port. Also, addr_offset should be supported if port is set. | |
460 | */ | |
461 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
462 | { | |
463 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
464 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
465 | } | |
466 | ||
c247f053 WB |
467 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
468 | * | |
469 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
470 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
471 | */ | |
472 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
473 | struct sk_buff *skb, | |
474 | int ee_origin) | |
829ae9d6 | 475 | { |
c247f053 WB |
476 | struct in_pktinfo *info; |
477 | ||
478 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
479 | return true; | |
829ae9d6 | 480 | |
c247f053 WB |
481 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
482 | return false; | |
483 | ||
484 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
1862d620 | 485 | * timestamp with egress dev. Not possible for packets without iif |
c247f053 WB |
486 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). |
487 | */ | |
1862d620 WB |
488 | info = PKTINFO_SKB_CB(skb); |
489 | if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || | |
490 | !info->ipi_ifindex) | |
829ae9d6 WB |
491 | return false; |
492 | ||
493 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
829ae9d6 WB |
494 | return true; |
495 | } | |
496 | ||
e905a9ed | 497 | /* |
1da177e4 LT |
498 | * Handle MSG_ERRQUEUE |
499 | */ | |
85fbaa75 | 500 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
501 | { |
502 | struct sock_exterr_skb *serr; | |
364a9e93 | 503 | struct sk_buff *skb; |
342dfc30 | 504 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
505 | struct { |
506 | struct sock_extended_err ee; | |
507 | struct sockaddr_in offender; | |
508 | } errhdr; | |
509 | int err; | |
510 | int copied; | |
511 | ||
512 | err = -EAGAIN; | |
364a9e93 | 513 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 514 | if (!skb) |
1da177e4 LT |
515 | goto out; |
516 | ||
517 | copied = skb->len; | |
518 | if (copied > len) { | |
519 | msg->msg_flags |= MSG_TRUNC; | |
520 | copied = len; | |
521 | } | |
51f3d02b | 522 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
523 | if (unlikely(err)) { |
524 | kfree_skb(skb); | |
525 | return err; | |
526 | } | |
1da177e4 LT |
527 | sock_recv_timestamp(msg, sk, skb); |
528 | ||
529 | serr = SKB_EXT_ERR(skb); | |
530 | ||
34b99df4 | 531 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 532 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
533 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
534 | serr->addr_offset); | |
1da177e4 LT |
535 | sin->sin_port = serr->port; |
536 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 537 | *addr_len = sizeof(*sin); |
1da177e4 LT |
538 | } |
539 | ||
540 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
541 | sin = &errhdr.offender; | |
f812116b | 542 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 543 | |
c247f053 | 544 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 545 | sin->sin_family = AF_INET; |
eddc9ec5 | 546 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 547 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
548 | ip_cmsg_recv(msg, skb); |
549 | } | |
550 | ||
551 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
552 | ||
553 | /* Now we could try to dump offended packet options */ | |
554 | ||
555 | msg->msg_flags |= MSG_ERRQUEUE; | |
556 | err = copied; | |
557 | ||
960a2628 | 558 | consume_skb(skb); |
1da177e4 LT |
559 | out: |
560 | return err; | |
561 | } | |
562 | ||
6ebf71ba CH |
563 | static void __ip_sock_set_tos(struct sock *sk, int val) |
564 | { | |
565 | if (sk->sk_type == SOCK_STREAM) { | |
566 | val &= ~INET_ECN_MASK; | |
567 | val |= inet_sk(sk)->tos & INET_ECN_MASK; | |
568 | } | |
569 | if (inet_sk(sk)->tos != val) { | |
570 | inet_sk(sk)->tos = val; | |
571 | sk->sk_priority = rt_tos2priority(val); | |
572 | sk_dst_reset(sk); | |
573 | } | |
574 | } | |
575 | ||
576 | void ip_sock_set_tos(struct sock *sk, int val) | |
577 | { | |
578 | lock_sock(sk); | |
579 | __ip_sock_set_tos(sk, val); | |
580 | release_sock(sk); | |
581 | } | |
582 | EXPORT_SYMBOL(ip_sock_set_tos); | |
1da177e4 LT |
583 | |
584 | /* | |
4d52cfbe ED |
585 | * Socket option code for IP. This is the end of the line after any |
586 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 587 | */ |
baf606d9 MRL |
588 | static bool setsockopt_needs_rtnl(int optname) |
589 | { | |
590 | switch (optname) { | |
591 | case IP_ADD_MEMBERSHIP: | |
592 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 593 | case IP_BLOCK_SOURCE: |
baf606d9 | 594 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
595 | case IP_DROP_SOURCE_MEMBERSHIP: |
596 | case IP_MSFILTER: | |
597 | case IP_UNBLOCK_SOURCE: | |
598 | case MCAST_BLOCK_SOURCE: | |
599 | case MCAST_MSFILTER: | |
baf606d9 | 600 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 601 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 602 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
603 | case MCAST_LEAVE_SOURCE_GROUP: |
604 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
605 | return true; |
606 | } | |
607 | return false; | |
608 | } | |
1da177e4 | 609 | |
e986d4da AV |
610 | static int set_mcast_msfilter(struct sock *sk, int ifindex, |
611 | int numsrc, int fmode, | |
612 | struct sockaddr_storage *group, | |
613 | struct sockaddr_storage *list) | |
614 | { | |
615 | int msize = IP_MSFILTER_SIZE(numsrc); | |
616 | struct ip_msfilter *msf; | |
617 | struct sockaddr_in *psin; | |
618 | int err, i; | |
619 | ||
620 | msf = kmalloc(msize, GFP_KERNEL); | |
621 | if (!msf) | |
622 | return -ENOBUFS; | |
623 | ||
624 | psin = (struct sockaddr_in *)group; | |
625 | if (psin->sin_family != AF_INET) | |
626 | goto Eaddrnotavail; | |
627 | msf->imsf_multiaddr = psin->sin_addr.s_addr; | |
628 | msf->imsf_interface = 0; | |
629 | msf->imsf_fmode = fmode; | |
630 | msf->imsf_numsrc = numsrc; | |
631 | for (i = 0; i < numsrc; ++i) { | |
632 | psin = (struct sockaddr_in *)&list[i]; | |
633 | ||
634 | if (psin->sin_family != AF_INET) | |
635 | goto Eaddrnotavail; | |
636 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
637 | } | |
638 | err = ip_mc_msfilter(sk, msf, ifindex); | |
639 | kfree(msf); | |
640 | return err; | |
641 | ||
642 | Eaddrnotavail: | |
643 | kfree(msf); | |
644 | return -EADDRNOTAVAIL; | |
645 | } | |
646 | ||
2bbf8c1e AV |
647 | static int do_mcast_group_source(struct sock *sk, int optname, |
648 | struct group_source_req *greqs) | |
649 | { | |
650 | struct ip_mreq_source mreqs; | |
651 | struct sockaddr_in *psin; | |
652 | int omode, add, err; | |
653 | ||
654 | if (greqs->gsr_group.ss_family != AF_INET || | |
655 | greqs->gsr_source.ss_family != AF_INET) | |
656 | return -EADDRNOTAVAIL; | |
657 | ||
658 | psin = (struct sockaddr_in *)&greqs->gsr_group; | |
659 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
660 | psin = (struct sockaddr_in *)&greqs->gsr_source; | |
661 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
662 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
663 | ||
664 | if (optname == MCAST_BLOCK_SOURCE) { | |
665 | omode = MCAST_EXCLUDE; | |
666 | add = 1; | |
667 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
668 | omode = MCAST_EXCLUDE; | |
669 | add = 0; | |
670 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
671 | struct ip_mreqn mreq; | |
672 | ||
673 | psin = (struct sockaddr_in *)&greqs->gsr_group; | |
674 | mreq.imr_multiaddr = psin->sin_addr; | |
675 | mreq.imr_address.s_addr = 0; | |
676 | mreq.imr_ifindex = greqs->gsr_interface; | |
677 | err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); | |
678 | if (err && err != -EADDRINUSE) | |
679 | return err; | |
680 | greqs->gsr_interface = mreq.imr_ifindex; | |
681 | omode = MCAST_INCLUDE; | |
682 | add = 1; | |
683 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
684 | omode = MCAST_INCLUDE; | |
685 | add = 0; | |
686 | } | |
687 | return ip_mc_source(add, omode, sk, &mreqs, greqs->gsr_interface); | |
688 | } | |
689 | ||
3fdadf7d | 690 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 691 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
692 | { |
693 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 694 | struct net *net = sock_net(sk); |
09cb105e | 695 | int val = 0, err; |
baf606d9 | 696 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 697 | |
0c9f79be XW |
698 | switch (optname) { |
699 | case IP_PKTINFO: | |
700 | case IP_RECVTTL: | |
701 | case IP_RECVOPTS: | |
702 | case IP_RECVTOS: | |
703 | case IP_RETOPTS: | |
704 | case IP_TOS: | |
705 | case IP_TTL: | |
706 | case IP_HDRINCL: | |
707 | case IP_MTU_DISCOVER: | |
708 | case IP_RECVERR: | |
709 | case IP_ROUTER_ALERT: | |
710 | case IP_FREEBIND: | |
711 | case IP_PASSSEC: | |
712 | case IP_TRANSPARENT: | |
713 | case IP_MINTTL: | |
714 | case IP_NODEFRAG: | |
90c337da | 715 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
716 | case IP_UNICAST_IF: |
717 | case IP_MULTICAST_TTL: | |
718 | case IP_MULTICAST_ALL: | |
719 | case IP_MULTICAST_LOOP: | |
720 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 721 | case IP_CHECKSUM: |
70ecc248 | 722 | case IP_RECVFRAGSIZE: |
1da177e4 LT |
723 | if (optlen >= sizeof(int)) { |
724 | if (get_user(val, (int __user *) optval)) | |
725 | return -EFAULT; | |
726 | } else if (optlen >= sizeof(char)) { | |
727 | unsigned char ucval; | |
728 | ||
729 | if (get_user(ucval, (unsigned char __user *) optval)) | |
730 | return -EFAULT; | |
731 | val = (int) ucval; | |
732 | } | |
733 | } | |
734 | ||
735 | /* If optlen==0, it is equivalent to val == 0 */ | |
736 | ||
0526947f KT |
737 | if (optname == IP_ROUTER_ALERT) |
738 | return ip_ra_control(sk, val ? 1 : 0, NULL); | |
6a9fb947 | 739 | if (ip_mroute_opt(optname)) |
09cb105e | 740 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
741 | |
742 | err = 0; | |
baf606d9 MRL |
743 | if (needs_rtnl) |
744 | rtnl_lock(); | |
1da177e4 LT |
745 | lock_sock(sk); |
746 | ||
747 | switch (optname) { | |
132adf54 SH |
748 | case IP_OPTIONS: |
749 | { | |
f6d8bd05 ED |
750 | struct ip_options_rcu *old, *opt = NULL; |
751 | ||
65a1c4ff | 752 | if (optlen > 40) |
132adf54 | 753 | goto e_inval; |
3b1e0a65 | 754 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 755 | optval, optlen); |
132adf54 SH |
756 | if (err) |
757 | break; | |
f6d8bd05 | 758 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 759 | lockdep_sock_is_held(sk)); |
132adf54 SH |
760 | if (inet->is_icsk) { |
761 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 762 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
763 | if (sk->sk_family == PF_INET || |
764 | (!((1 << sk->sk_state) & | |
765 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 766 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 767 | #endif |
f6d8bd05 ED |
768 | if (old) |
769 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 770 | if (opt) |
f6d8bd05 | 771 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 772 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 773 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 774 | } |
132adf54 | 775 | #endif |
1da177e4 | 776 | } |
f6d8bd05 ED |
777 | rcu_assign_pointer(inet->inet_opt, opt); |
778 | if (old) | |
605b4afe | 779 | kfree_rcu(old, rcu); |
132adf54 SH |
780 | break; |
781 | } | |
782 | case IP_PKTINFO: | |
783 | if (val) | |
784 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
785 | else | |
786 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
787 | break; | |
788 | case IP_RECVTTL: | |
789 | if (val) | |
790 | inet->cmsg_flags |= IP_CMSG_TTL; | |
791 | else | |
792 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
793 | break; | |
794 | case IP_RECVTOS: | |
795 | if (val) | |
796 | inet->cmsg_flags |= IP_CMSG_TOS; | |
797 | else | |
798 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
799 | break; | |
800 | case IP_RECVOPTS: | |
801 | if (val) | |
802 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
803 | else | |
804 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
805 | break; | |
806 | case IP_RETOPTS: | |
807 | if (val) | |
808 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
809 | else | |
810 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
811 | break; | |
812 | case IP_PASSSEC: | |
813 | if (val) | |
814 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
815 | else | |
816 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
817 | break; | |
e8b2dfe9 BS |
818 | case IP_RECVORIGDSTADDR: |
819 | if (val) | |
820 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
821 | else | |
822 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
823 | break; | |
ad6f939a TH |
824 | case IP_CHECKSUM: |
825 | if (val) { | |
826 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
827 | inet_inc_convert_csum(sk); | |
828 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
829 | } | |
830 | } else { | |
831 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
832 | inet_dec_convert_csum(sk); | |
833 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
834 | } | |
835 | } | |
836 | break; | |
70ecc248 WB |
837 | case IP_RECVFRAGSIZE: |
838 | if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) | |
839 | goto e_inval; | |
840 | if (val) | |
841 | inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; | |
842 | else | |
843 | inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; | |
844 | break; | |
132adf54 | 845 | case IP_TOS: /* This sets both TOS and Precedence */ |
6ebf71ba | 846 | __ip_sock_set_tos(sk, val); |
132adf54 SH |
847 | break; |
848 | case IP_TTL: | |
4d52cfbe | 849 | if (optlen < 1) |
132adf54 | 850 | goto e_inval; |
c9be4a5c | 851 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
852 | goto e_inval; |
853 | inet->uc_ttl = val; | |
854 | break; | |
855 | case IP_HDRINCL: | |
856 | if (sk->sk_type != SOCK_RAW) { | |
857 | err = -ENOPROTOOPT; | |
2c7946a7 | 858 | break; |
132adf54 SH |
859 | } |
860 | inet->hdrincl = val ? 1 : 0; | |
861 | break; | |
7b2ff18e JO |
862 | case IP_NODEFRAG: |
863 | if (sk->sk_type != SOCK_RAW) { | |
864 | err = -ENOPROTOOPT; | |
865 | break; | |
866 | } | |
867 | inet->nodefrag = val ? 1 : 0; | |
868 | break; | |
90c337da ED |
869 | case IP_BIND_ADDRESS_NO_PORT: |
870 | inet->bind_address_no_port = val ? 1 : 0; | |
871 | break; | |
132adf54 | 872 | case IP_MTU_DISCOVER: |
1b346576 | 873 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
874 | goto e_inval; |
875 | inet->pmtudisc = val; | |
876 | break; | |
877 | case IP_RECVERR: | |
878 | inet->recverr = !!val; | |
879 | if (!val) | |
880 | skb_queue_purge(&sk->sk_error_queue); | |
881 | break; | |
882 | case IP_MULTICAST_TTL: | |
883 | if (sk->sk_type == SOCK_STREAM) | |
884 | goto e_inval; | |
4d52cfbe | 885 | if (optlen < 1) |
132adf54 | 886 | goto e_inval; |
09cb105e | 887 | if (val == -1) |
132adf54 SH |
888 | val = 1; |
889 | if (val < 0 || val > 255) | |
890 | goto e_inval; | |
891 | inet->mc_ttl = val; | |
892 | break; | |
893 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 894 | if (optlen < 1) |
132adf54 SH |
895 | goto e_inval; |
896 | inet->mc_loop = !!val; | |
897 | break; | |
76e21053 EH |
898 | case IP_UNICAST_IF: |
899 | { | |
900 | struct net_device *dev = NULL; | |
901 | int ifindex; | |
9515a2e0 | 902 | int midx; |
76e21053 EH |
903 | |
904 | if (optlen != sizeof(int)) | |
905 | goto e_inval; | |
906 | ||
907 | ifindex = (__force int)ntohl((__force __be32)val); | |
908 | if (ifindex == 0) { | |
909 | inet->uc_index = 0; | |
910 | err = 0; | |
911 | break; | |
912 | } | |
913 | ||
914 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
915 | err = -EADDRNOTAVAIL; | |
916 | if (!dev) | |
917 | break; | |
9515a2e0 DA |
918 | |
919 | midx = l3mdev_master_ifindex(dev); | |
76e21053 EH |
920 | dev_put(dev); |
921 | ||
922 | err = -EINVAL; | |
9515a2e0 DA |
923 | if (sk->sk_bound_dev_if && |
924 | (!midx || midx != sk->sk_bound_dev_if)) | |
76e21053 EH |
925 | break; |
926 | ||
927 | inet->uc_index = ifindex; | |
928 | err = 0; | |
929 | break; | |
930 | } | |
132adf54 SH |
931 | case IP_MULTICAST_IF: |
932 | { | |
933 | struct ip_mreqn mreq; | |
934 | struct net_device *dev = NULL; | |
7bb387c5 | 935 | int midx; |
132adf54 SH |
936 | |
937 | if (sk->sk_type == SOCK_STREAM) | |
938 | goto e_inval; | |
939 | /* | |
940 | * Check the arguments are allowable | |
941 | */ | |
942 | ||
0915921b SW |
943 | if (optlen < sizeof(struct in_addr)) |
944 | goto e_inval; | |
945 | ||
132adf54 SH |
946 | err = -EFAULT; |
947 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 948 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 949 | break; |
132adf54 SH |
950 | } else { |
951 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
952 | if (optlen >= sizeof(struct ip_mreq)) { |
953 | if (copy_from_user(&mreq, optval, | |
954 | sizeof(struct ip_mreq))) | |
955 | break; | |
956 | } else if (optlen >= sizeof(struct in_addr)) { | |
957 | if (copy_from_user(&mreq.imr_address, optval, | |
958 | sizeof(struct in_addr))) | |
959 | break; | |
960 | } | |
132adf54 SH |
961 | } |
962 | ||
963 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 964 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
965 | inet->mc_index = 0; |
966 | inet->mc_addr = 0; | |
967 | err = 0; | |
1da177e4 LT |
968 | break; |
969 | } | |
3b1e0a65 | 970 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 971 | if (dev) |
132adf54 | 972 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 973 | } else |
55b80503 | 974 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 975 | |
1da177e4 | 976 | |
132adf54 SH |
977 | err = -EADDRNOTAVAIL; |
978 | if (!dev) | |
979 | break; | |
7bb387c5 DA |
980 | |
981 | midx = l3mdev_master_ifindex(dev); | |
982 | ||
55b80503 | 983 | dev_put(dev); |
132adf54 SH |
984 | |
985 | err = -EINVAL; | |
986 | if (sk->sk_bound_dev_if && | |
7bb387c5 DA |
987 | mreq.imr_ifindex != sk->sk_bound_dev_if && |
988 | (!midx || midx != sk->sk_bound_dev_if)) | |
132adf54 | 989 | break; |
1da177e4 | 990 | |
132adf54 SH |
991 | inet->mc_index = mreq.imr_ifindex; |
992 | inet->mc_addr = mreq.imr_address.s_addr; | |
993 | err = 0; | |
994 | break; | |
995 | } | |
1da177e4 | 996 | |
132adf54 SH |
997 | case IP_ADD_MEMBERSHIP: |
998 | case IP_DROP_MEMBERSHIP: | |
999 | { | |
1000 | struct ip_mreqn mreq; | |
1da177e4 | 1001 | |
a96fb49b FL |
1002 | err = -EPROTO; |
1003 | if (inet_sk(sk)->is_icsk) | |
1004 | break; | |
1005 | ||
132adf54 SH |
1006 | if (optlen < sizeof(struct ip_mreq)) |
1007 | goto e_inval; | |
1008 | err = -EFAULT; | |
1009 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 1010 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 1011 | break; |
132adf54 SH |
1012 | } else { |
1013 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 1014 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 1015 | break; |
132adf54 | 1016 | } |
1da177e4 | 1017 | |
132adf54 | 1018 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 1019 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1020 | else |
54ff9ef3 | 1021 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1022 | break; |
1023 | } | |
1024 | case IP_MSFILTER: | |
1025 | { | |
132adf54 SH |
1026 | struct ip_msfilter *msf; |
1027 | ||
1028 | if (optlen < IP_MSFILTER_SIZE(0)) | |
1029 | goto e_inval; | |
1030 | if (optlen > sysctl_optmem_max) { | |
1031 | err = -ENOBUFS; | |
1da177e4 LT |
1032 | break; |
1033 | } | |
a2c841d9 AV |
1034 | msf = memdup_user(optval, optlen); |
1035 | if (IS_ERR(msf)) { | |
1036 | err = PTR_ERR(msf); | |
132adf54 SH |
1037 | break; |
1038 | } | |
1039 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
1040 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 1041 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1042 | kfree(msf); |
1043 | err = -ENOBUFS; | |
1044 | break; | |
1045 | } | |
1046 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
1047 | kfree(msf); | |
1048 | err = -EINVAL; | |
1049 | break; | |
1050 | } | |
1051 | err = ip_mc_msfilter(sk, msf, 0); | |
1052 | kfree(msf); | |
1053 | break; | |
1054 | } | |
1055 | case IP_BLOCK_SOURCE: | |
1056 | case IP_UNBLOCK_SOURCE: | |
1057 | case IP_ADD_SOURCE_MEMBERSHIP: | |
1058 | case IP_DROP_SOURCE_MEMBERSHIP: | |
1059 | { | |
1060 | struct ip_mreq_source mreqs; | |
1061 | int omode, add; | |
1da177e4 | 1062 | |
132adf54 SH |
1063 | if (optlen != sizeof(struct ip_mreq_source)) |
1064 | goto e_inval; | |
1065 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 1066 | err = -EFAULT; |
1da177e4 LT |
1067 | break; |
1068 | } | |
132adf54 SH |
1069 | if (optname == IP_BLOCK_SOURCE) { |
1070 | omode = MCAST_EXCLUDE; | |
1071 | add = 1; | |
1072 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
1073 | omode = MCAST_EXCLUDE; | |
1074 | add = 0; | |
1075 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
1076 | struct ip_mreqn mreq; | |
1da177e4 | 1077 | |
132adf54 SH |
1078 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
1079 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
1080 | mreq.imr_ifindex = 0; | |
6e2059b5 | 1081 | err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); |
132adf54 | 1082 | if (err && err != -EADDRINUSE) |
1da177e4 | 1083 | break; |
132adf54 SH |
1084 | omode = MCAST_INCLUDE; |
1085 | add = 1; | |
1086 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
1087 | omode = MCAST_INCLUDE; | |
1088 | add = 0; | |
1089 | } | |
1090 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
1091 | break; | |
1092 | } | |
1093 | case MCAST_JOIN_GROUP: | |
1094 | case MCAST_LEAVE_GROUP: | |
1095 | { | |
1096 | struct group_req greq; | |
1097 | struct sockaddr_in *psin; | |
1098 | struct ip_mreqn mreq; | |
1099 | ||
1100 | if (optlen < sizeof(struct group_req)) | |
1101 | goto e_inval; | |
1102 | err = -EFAULT; | |
1103 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
1104 | break; | |
1105 | psin = (struct sockaddr_in *)&greq.gr_group; | |
1106 | if (psin->sin_family != AF_INET) | |
1107 | goto e_inval; | |
1108 | memset(&mreq, 0, sizeof(mreq)); | |
1109 | mreq.imr_multiaddr = psin->sin_addr; | |
1110 | mreq.imr_ifindex = greq.gr_interface; | |
1111 | ||
1112 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 1113 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1114 | else |
54ff9ef3 | 1115 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1116 | break; |
1117 | } | |
1118 | case MCAST_JOIN_SOURCE_GROUP: | |
1119 | case MCAST_LEAVE_SOURCE_GROUP: | |
1120 | case MCAST_BLOCK_SOURCE: | |
1121 | case MCAST_UNBLOCK_SOURCE: | |
1122 | { | |
1123 | struct group_source_req greqs; | |
132adf54 SH |
1124 | |
1125 | if (optlen != sizeof(struct group_source_req)) | |
1126 | goto e_inval; | |
1127 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1128 | err = -EFAULT; |
1da177e4 LT |
1129 | break; |
1130 | } | |
2bbf8c1e | 1131 | err = do_mcast_group_source(sk, optname, &greqs); |
132adf54 SH |
1132 | break; |
1133 | } | |
1134 | case MCAST_MSFILTER: | |
1135 | { | |
132adf54 | 1136 | struct group_filter *gsf = NULL; |
132adf54 SH |
1137 | |
1138 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1139 | goto e_inval; | |
1140 | if (optlen > sysctl_optmem_max) { | |
1141 | err = -ENOBUFS; | |
1da177e4 LT |
1142 | break; |
1143 | } | |
a2c841d9 AV |
1144 | gsf = memdup_user(optval, optlen); |
1145 | if (IS_ERR(gsf)) { | |
1146 | err = PTR_ERR(gsf); | |
1da177e4 LT |
1147 | break; |
1148 | } | |
132adf54 SH |
1149 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1150 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1151 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1152 | err = -ENOBUFS; |
1153 | goto mc_msf_out; | |
1154 | } | |
1155 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1156 | err = -EINVAL; | |
1157 | goto mc_msf_out; | |
1158 | } | |
e986d4da AV |
1159 | err = set_mcast_msfilter(sk, gsf->gf_interface, |
1160 | gsf->gf_numsrc, gsf->gf_fmode, | |
1161 | &gsf->gf_group, gsf->gf_slist); | |
4d52cfbe | 1162 | mc_msf_out: |
132adf54 SH |
1163 | kfree(gsf); |
1164 | break; | |
1165 | } | |
f771bef9 NS |
1166 | case IP_MULTICAST_ALL: |
1167 | if (optlen < 1) | |
1168 | goto e_inval; | |
1169 | if (val != 0 && val != 1) | |
1170 | goto e_inval; | |
1171 | inet->mc_all = val; | |
1172 | break; | |
132adf54 SH |
1173 | |
1174 | case IP_FREEBIND: | |
4d52cfbe | 1175 | if (optlen < 1) |
132adf54 SH |
1176 | goto e_inval; |
1177 | inet->freebind = !!val; | |
1178 | break; | |
1179 | ||
1180 | case IP_IPSEC_POLICY: | |
1181 | case IP_XFRM_POLICY: | |
1182 | err = -EPERM; | |
52e804c6 | 1183 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1184 | break; |
132adf54 SH |
1185 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1186 | break; | |
1da177e4 | 1187 | |
f5715aea | 1188 | case IP_TRANSPARENT: |
52e804c6 EB |
1189 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1190 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1191 | err = -EPERM; |
1192 | break; | |
1193 | } | |
1194 | if (optlen < 1) | |
1195 | goto e_inval; | |
1196 | inet->transparent = !!val; | |
1197 | break; | |
1198 | ||
d218d111 SH |
1199 | case IP_MINTTL: |
1200 | if (optlen < 1) | |
1201 | goto e_inval; | |
1202 | if (val < 0 || val > 255) | |
1203 | goto e_inval; | |
1204 | inet->min_ttl = val; | |
1205 | break; | |
1206 | ||
132adf54 SH |
1207 | default: |
1208 | err = -ENOPROTOOPT; | |
1209 | break; | |
1da177e4 LT |
1210 | } |
1211 | release_sock(sk); | |
baf606d9 MRL |
1212 | if (needs_rtnl) |
1213 | rtnl_unlock(); | |
1da177e4 LT |
1214 | return err; |
1215 | ||
1216 | e_inval: | |
1217 | release_sock(sk); | |
baf606d9 MRL |
1218 | if (needs_rtnl) |
1219 | rtnl_unlock(); | |
1da177e4 LT |
1220 | return -EINVAL; |
1221 | } | |
1222 | ||
f84af32c | 1223 | /** |
829ae9d6 | 1224 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1225 | * @sk: socket |
1226 | * @skb: buffer | |
1227 | * | |
35ebf65e DM |
1228 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1229 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1230 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1231 | */ |
fbf8866d | 1232 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1233 | { |
d826eb14 | 1234 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1235 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1236 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1237 | |
4b261c75 | 1238 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1239 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1240 | * which has interface index (iif) as the first member of the | |
1241 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1242 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
f0c16ba8 WZ |
1243 | * element so the iif is picked up from the prior IPCB. If iif |
1244 | * is the loopback interface, then return the sending interface | |
1245 | * (e.g., process binds socket to eth0 for Tx which is | |
1246 | * redirected to loopback in the rtable/dst). | |
0b922b7a | 1247 | */ |
cbea8f02 DA |
1248 | struct rtable *rt = skb_rtable(skb); |
1249 | bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); | |
1250 | ||
1251 | if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) | |
f0c16ba8 | 1252 | pktinfo->ipi_ifindex = inet_iif(skb); |
cbea8f02 DA |
1253 | else if (l3slave && rt && rt->rt_iif) |
1254 | pktinfo->ipi_ifindex = rt->rt_iif; | |
f0c16ba8 | 1255 | |
35ebf65e | 1256 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1257 | } else { |
1258 | pktinfo->ipi_ifindex = 0; | |
1259 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1260 | } | |
61a1030b | 1261 | skb_dst_drop(skb); |
f84af32c | 1262 | } |
f84af32c | 1263 | |
3fdadf7d | 1264 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1265 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1266 | { |
1267 | int err; | |
1268 | ||
1269 | if (level != SOL_IP) | |
1270 | return -ENOPROTOOPT; | |
1271 | ||
1272 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
97adadda | 1273 | #if IS_ENABLED(CONFIG_BPFILTER_UMH) |
d2ba09c1 AS |
1274 | if (optname >= BPFILTER_IPT_SO_SET_REPLACE && |
1275 | optname < BPFILTER_IPT_SET_MAX) | |
1276 | err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); | |
1277 | #endif | |
3fdadf7d DM |
1278 | #ifdef CONFIG_NETFILTER |
1279 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1280 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1281 | optname != IP_IPSEC_POLICY && |
1282 | optname != IP_XFRM_POLICY && | |
3f34cfae | 1283 | !ip_mroute_opt(optname)) |
3fdadf7d | 1284 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
3fdadf7d DM |
1285 | #endif |
1286 | return err; | |
1287 | } | |
4d52cfbe | 1288 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1289 | |
1290 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1291 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1292 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1293 | { |
1294 | int err; | |
1295 | ||
1296 | if (level != SOL_IP) | |
1297 | return -ENOPROTOOPT; | |
1298 | ||
e9c375fb AV |
1299 | switch (optname) { |
1300 | case MCAST_JOIN_GROUP: | |
1301 | case MCAST_LEAVE_GROUP: | |
2f984f11 AV |
1302 | { |
1303 | struct compat_group_req __user *gr32 = (void __user *)optval; | |
1304 | struct group_req greq; | |
1305 | struct sockaddr_in *psin = (struct sockaddr_in *)&greq.gr_group; | |
1306 | struct ip_mreqn mreq; | |
1307 | ||
1308 | if (optlen < sizeof(struct compat_group_req)) | |
1309 | return -EINVAL; | |
1310 | ||
1311 | if (get_user(greq.gr_interface, &gr32->gr_interface) || | |
1312 | copy_from_user(&greq.gr_group, &gr32->gr_group, | |
1313 | sizeof(greq.gr_group))) | |
1314 | return -EFAULT; | |
1315 | ||
1316 | if (psin->sin_family != AF_INET) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | memset(&mreq, 0, sizeof(mreq)); | |
1320 | mreq.imr_multiaddr = psin->sin_addr; | |
1321 | mreq.imr_ifindex = greq.gr_interface; | |
1322 | ||
1323 | rtnl_lock(); | |
1324 | lock_sock(sk); | |
1325 | if (optname == MCAST_JOIN_GROUP) | |
1326 | err = ip_mc_join_group(sk, &mreq); | |
1327 | else | |
1328 | err = ip_mc_leave_group(sk, &mreq); | |
1329 | release_sock(sk); | |
1330 | rtnl_unlock(); | |
1331 | return err; | |
1332 | } | |
e9c375fb AV |
1333 | case MCAST_JOIN_SOURCE_GROUP: |
1334 | case MCAST_LEAVE_SOURCE_GROUP: | |
1335 | case MCAST_BLOCK_SOURCE: | |
1336 | case MCAST_UNBLOCK_SOURCE: | |
b212c322 AV |
1337 | { |
1338 | struct compat_group_source_req __user *gsr32 = (void __user *)optval; | |
1339 | struct group_source_req greqs; | |
1340 | ||
1341 | if (optlen != sizeof(struct compat_group_source_req)) | |
1342 | return -EINVAL; | |
1343 | ||
1344 | if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) || | |
1345 | copy_from_user(&greqs.gsr_group, &gsr32->gsr_group, | |
1346 | sizeof(greqs.gsr_group)) || | |
1347 | copy_from_user(&greqs.gsr_source, &gsr32->gsr_source, | |
1348 | sizeof(greqs.gsr_source))) | |
1349 | return -EFAULT; | |
1350 | ||
1351 | rtnl_lock(); | |
1352 | lock_sock(sk); | |
1353 | err = do_mcast_group_source(sk, optname, &greqs); | |
1354 | release_sock(sk); | |
1355 | rtnl_unlock(); | |
1356 | return err; | |
1357 | } | |
2e041728 AV |
1358 | case MCAST_MSFILTER: |
1359 | { | |
1360 | const int size0 = offsetof(struct compat_group_filter, gf_slist); | |
1361 | struct compat_group_filter *gf32; | |
6a1015b0 | 1362 | unsigned int n; |
2e041728 | 1363 | void *p; |
2e041728 AV |
1364 | |
1365 | if (optlen < size0) | |
1366 | return -EINVAL; | |
1367 | if (optlen > sysctl_optmem_max - 4) | |
1368 | return -ENOBUFS; | |
1369 | ||
1370 | p = kmalloc(optlen + 4, GFP_KERNEL); | |
1371 | if (!p) | |
1372 | return -ENOMEM; | |
1373 | gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */ | |
1374 | if (copy_from_user(gf32, optval, optlen)) { | |
1375 | err = -EFAULT; | |
1376 | goto mc_msf_out; | |
1377 | } | |
1378 | ||
1379 | n = gf32->gf_numsrc; | |
1380 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ | |
1381 | if (n >= 0x1ffffff) { | |
1382 | err = -ENOBUFS; | |
1383 | goto mc_msf_out; | |
1384 | } | |
1385 | if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) { | |
1386 | err = -EINVAL; | |
1387 | goto mc_msf_out; | |
1388 | } | |
1389 | ||
1390 | rtnl_lock(); | |
1391 | lock_sock(sk); | |
1392 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ | |
1393 | if (n > sock_net(sk)->ipv4.sysctl_igmp_max_msf) | |
1394 | err = -ENOBUFS; | |
1395 | else | |
1396 | err = set_mcast_msfilter(sk, gf32->gf_interface, | |
1397 | n, gf32->gf_fmode, | |
1398 | &gf32->gf_group, gf32->gf_slist); | |
1399 | release_sock(sk); | |
1400 | rtnl_unlock(); | |
1401 | mc_msf_out: | |
1402 | kfree(p); | |
1403 | return err; | |
1404 | } | |
e9c375fb | 1405 | } |
dae50295 | 1406 | |
3fdadf7d DM |
1407 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1408 | #ifdef CONFIG_NETFILTER | |
1409 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1410 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1411 | optname != IP_IPSEC_POLICY && |
1412 | optname != IP_XFRM_POLICY && | |
3f34cfae PA |
1413 | !ip_mroute_opt(optname)) |
1414 | err = compat_nf_setsockopt(sk, PF_INET, optname, optval, | |
1415 | optlen); | |
3fdadf7d DM |
1416 | #endif |
1417 | return err; | |
1418 | } | |
543d9cfe | 1419 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1420 | #endif |
1421 | ||
1da177e4 | 1422 | /* |
4d52cfbe ED |
1423 | * Get the options. Note for future reference. The GET of IP options gets |
1424 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1425 | */ |
1426 | ||
87e9f031 WC |
1427 | static bool getsockopt_needs_rtnl(int optname) |
1428 | { | |
1429 | switch (optname) { | |
1430 | case IP_MSFILTER: | |
1431 | case MCAST_MSFILTER: | |
1432 | return true; | |
1433 | } | |
1434 | return false; | |
1435 | } | |
1436 | ||
3fdadf7d | 1437 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1438 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1439 | { |
1440 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1441 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1442 | int val, err = 0; | |
1da177e4 | 1443 | int len; |
e905a9ed | 1444 | |
132adf54 | 1445 | if (level != SOL_IP) |
1da177e4 LT |
1446 | return -EOPNOTSUPP; |
1447 | ||
6a9fb947 | 1448 | if (ip_mroute_opt(optname)) |
09cb105e | 1449 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1450 | |
09cb105e | 1451 | if (get_user(len, optlen)) |
1da177e4 | 1452 | return -EFAULT; |
132adf54 | 1453 | if (len < 0) |
1da177e4 | 1454 | return -EINVAL; |
e905a9ed | 1455 | |
87e9f031 WC |
1456 | if (needs_rtnl) |
1457 | rtnl_lock(); | |
1da177e4 LT |
1458 | lock_sock(sk); |
1459 | ||
132adf54 SH |
1460 | switch (optname) { |
1461 | case IP_OPTIONS: | |
1462 | { | |
1463 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1464 | struct ip_options *opt = (struct ip_options *)optbuf; |
1465 | struct ip_options_rcu *inet_opt; | |
1466 | ||
1467 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1468 | lockdep_sock_is_held(sk)); |
132adf54 | 1469 | opt->optlen = 0; |
f6d8bd05 ED |
1470 | if (inet_opt) |
1471 | memcpy(optbuf, &inet_opt->opt, | |
1472 | sizeof(struct ip_options) + | |
1473 | inet_opt->opt.optlen); | |
132adf54 SH |
1474 | release_sock(sk); |
1475 | ||
1476 | if (opt->optlen == 0) | |
1477 | return put_user(0, optlen); | |
1478 | ||
1479 | ip_options_undo(opt); | |
1480 | ||
1481 | len = min_t(unsigned int, len, opt->optlen); | |
1482 | if (put_user(len, optlen)) | |
1483 | return -EFAULT; | |
1484 | if (copy_to_user(optval, opt->__data, len)) | |
1485 | return -EFAULT; | |
1486 | return 0; | |
1487 | } | |
1488 | case IP_PKTINFO: | |
1489 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1490 | break; | |
1491 | case IP_RECVTTL: | |
1492 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1493 | break; | |
1494 | case IP_RECVTOS: | |
1495 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1496 | break; | |
1497 | case IP_RECVOPTS: | |
1498 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1499 | break; | |
1500 | case IP_RETOPTS: | |
1501 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1502 | break; | |
1503 | case IP_PASSSEC: | |
1504 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1505 | break; | |
e8b2dfe9 BS |
1506 | case IP_RECVORIGDSTADDR: |
1507 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1508 | break; | |
ad6f939a TH |
1509 | case IP_CHECKSUM: |
1510 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1511 | break; | |
70ecc248 WB |
1512 | case IP_RECVFRAGSIZE: |
1513 | val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; | |
1514 | break; | |
132adf54 SH |
1515 | case IP_TOS: |
1516 | val = inet->tos; | |
1517 | break; | |
1518 | case IP_TTL: | |
fa50d974 NB |
1519 | { |
1520 | struct net *net = sock_net(sk); | |
132adf54 | 1521 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1522 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1523 | inet->uc_ttl); |
1524 | break; | |
fa50d974 | 1525 | } |
132adf54 SH |
1526 | case IP_HDRINCL: |
1527 | val = inet->hdrincl; | |
1528 | break; | |
a89b4763 MK |
1529 | case IP_NODEFRAG: |
1530 | val = inet->nodefrag; | |
1531 | break; | |
90c337da ED |
1532 | case IP_BIND_ADDRESS_NO_PORT: |
1533 | val = inet->bind_address_no_port; | |
1534 | break; | |
132adf54 SH |
1535 | case IP_MTU_DISCOVER: |
1536 | val = inet->pmtudisc; | |
1537 | break; | |
1538 | case IP_MTU: | |
1539 | { | |
1540 | struct dst_entry *dst; | |
1541 | val = 0; | |
1542 | dst = sk_dst_get(sk); | |
1543 | if (dst) { | |
1544 | val = dst_mtu(dst); | |
1545 | dst_release(dst); | |
1da177e4 | 1546 | } |
132adf54 | 1547 | if (!val) { |
1da177e4 | 1548 | release_sock(sk); |
132adf54 | 1549 | return -ENOTCONN; |
1da177e4 | 1550 | } |
132adf54 SH |
1551 | break; |
1552 | } | |
1553 | case IP_RECVERR: | |
1554 | val = inet->recverr; | |
1555 | break; | |
1556 | case IP_MULTICAST_TTL: | |
1557 | val = inet->mc_ttl; | |
1558 | break; | |
1559 | case IP_MULTICAST_LOOP: | |
1560 | val = inet->mc_loop; | |
1561 | break; | |
76e21053 EH |
1562 | case IP_UNICAST_IF: |
1563 | val = (__force int)htonl((__u32) inet->uc_index); | |
1564 | break; | |
132adf54 SH |
1565 | case IP_MULTICAST_IF: |
1566 | { | |
1567 | struct in_addr addr; | |
1568 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1569 | addr.s_addr = inet->mc_addr; | |
1570 | release_sock(sk); | |
1da177e4 | 1571 | |
132adf54 SH |
1572 | if (put_user(len, optlen)) |
1573 | return -EFAULT; | |
1574 | if (copy_to_user(optval, &addr, len)) | |
1575 | return -EFAULT; | |
1576 | return 0; | |
1577 | } | |
1578 | case IP_MSFILTER: | |
1579 | { | |
1580 | struct ip_msfilter msf; | |
132adf54 SH |
1581 | |
1582 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1583 | err = -EINVAL; |
1584 | goto out; | |
1da177e4 | 1585 | } |
132adf54 | 1586 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1587 | err = -EFAULT; |
1588 | goto out; | |
1da177e4 | 1589 | } |
132adf54 SH |
1590 | err = ip_mc_msfget(sk, &msf, |
1591 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1592 | goto out; |
132adf54 SH |
1593 | } |
1594 | case MCAST_MSFILTER: | |
1595 | { | |
931ca7ab | 1596 | struct group_filter __user *p = (void __user *)optval; |
132adf54 | 1597 | struct group_filter gsf; |
931ca7ab AV |
1598 | const int size0 = offsetof(struct group_filter, gf_slist); |
1599 | int num; | |
1da177e4 | 1600 | |
931ca7ab | 1601 | if (len < size0) { |
87e9f031 WC |
1602 | err = -EINVAL; |
1603 | goto out; | |
132adf54 | 1604 | } |
931ca7ab | 1605 | if (copy_from_user(&gsf, p, size0)) { |
87e9f031 WC |
1606 | err = -EFAULT; |
1607 | goto out; | |
132adf54 | 1608 | } |
931ca7ab AV |
1609 | num = gsf.gf_numsrc; |
1610 | err = ip_mc_gsfget(sk, &gsf, p->gf_slist); | |
1611 | if (err) | |
1612 | goto out; | |
1613 | if (gsf.gf_numsrc < num) | |
1614 | num = gsf.gf_numsrc; | |
1615 | if (put_user(GROUP_FILTER_SIZE(num), optlen) || | |
1616 | copy_to_user(p, &gsf, size0)) | |
1617 | err = -EFAULT; | |
87e9f031 | 1618 | goto out; |
132adf54 | 1619 | } |
f771bef9 NS |
1620 | case IP_MULTICAST_ALL: |
1621 | val = inet->mc_all; | |
1622 | break; | |
132adf54 SH |
1623 | case IP_PKTOPTIONS: |
1624 | { | |
1625 | struct msghdr msg; | |
1da177e4 | 1626 | |
132adf54 | 1627 | release_sock(sk); |
1da177e4 | 1628 | |
132adf54 SH |
1629 | if (sk->sk_type != SOCK_STREAM) |
1630 | return -ENOPROTOOPT; | |
1da177e4 | 1631 | |
1f466e1f CH |
1632 | msg.msg_control_is_user = true; |
1633 | msg.msg_control_user = optval; | |
132adf54 | 1634 | msg.msg_controllen = len; |
dd23198e | 1635 | msg.msg_flags = flags; |
1da177e4 | 1636 | |
132adf54 SH |
1637 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1638 | struct in_pktinfo info; | |
1639 | ||
c720c7e8 ED |
1640 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1641 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1642 | info.ipi_ifindex = inet->mc_index; |
1643 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1644 | } |
132adf54 SH |
1645 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1646 | int hlim = inet->mc_ttl; | |
1647 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1648 | } | |
4c507d28 JB |
1649 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1650 | int tos = inet->rcv_tos; | |
1651 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1652 | } | |
132adf54 SH |
1653 | len -= msg.msg_controllen; |
1654 | return put_user(len, optlen); | |
1655 | } | |
1656 | case IP_FREEBIND: | |
1657 | val = inet->freebind; | |
1658 | break; | |
f5715aea KK |
1659 | case IP_TRANSPARENT: |
1660 | val = inet->transparent; | |
1661 | break; | |
d218d111 SH |
1662 | case IP_MINTTL: |
1663 | val = inet->min_ttl; | |
1664 | break; | |
132adf54 SH |
1665 | default: |
1666 | release_sock(sk); | |
1667 | return -ENOPROTOOPT; | |
1da177e4 LT |
1668 | } |
1669 | release_sock(sk); | |
e905a9ed | 1670 | |
4d52cfbe | 1671 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1672 | unsigned char ucval = (unsigned char)val; |
1673 | len = 1; | |
132adf54 | 1674 | if (put_user(len, optlen)) |
1da177e4 | 1675 | return -EFAULT; |
09cb105e | 1676 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1677 | return -EFAULT; |
1678 | } else { | |
1679 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1680 | if (put_user(len, optlen)) |
1da177e4 | 1681 | return -EFAULT; |
09cb105e | 1682 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1683 | return -EFAULT; |
1684 | } | |
1685 | return 0; | |
87e9f031 WC |
1686 | |
1687 | out: | |
1688 | release_sock(sk); | |
1689 | if (needs_rtnl) | |
1690 | rtnl_unlock(); | |
1691 | return err; | |
1da177e4 LT |
1692 | } |
1693 | ||
3fdadf7d | 1694 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1695 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1696 | { |
1697 | int err; | |
1698 | ||
dd23198e | 1699 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
97adadda | 1700 | #if IS_ENABLED(CONFIG_BPFILTER_UMH) |
d2ba09c1 AS |
1701 | if (optname >= BPFILTER_IPT_SO_GET_INFO && |
1702 | optname < BPFILTER_IPT_GET_MAX) | |
1703 | err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); | |
1704 | #endif | |
3fdadf7d DM |
1705 | #ifdef CONFIG_NETFILTER |
1706 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1707 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1708 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1709 | int len; |
3fdadf7d | 1710 | |
09cb105e | 1711 | if (get_user(len, optlen)) |
3fdadf7d DM |
1712 | return -EFAULT; |
1713 | ||
01ea306f | 1714 | err = nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1715 | if (err >= 0) |
1716 | err = put_user(len, optlen); | |
1717 | return err; | |
1718 | } | |
1719 | #endif | |
1720 | return err; | |
1721 | } | |
4d52cfbe | 1722 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1723 | |
1724 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1725 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1726 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1727 | { |
42908c69 DS |
1728 | int err; |
1729 | ||
0dfe6581 AV |
1730 | if (optname == MCAST_MSFILTER) { |
1731 | const int size0 = offsetof(struct compat_group_filter, gf_slist); | |
1732 | struct compat_group_filter __user *p = (void __user *)optval; | |
1733 | struct compat_group_filter gf32; | |
1734 | struct group_filter gf; | |
1735 | int ulen, err; | |
1736 | int num; | |
1737 | ||
1738 | if (level != SOL_IP) | |
1739 | return -EOPNOTSUPP; | |
1740 | ||
1741 | if (get_user(ulen, optlen)) | |
1742 | return -EFAULT; | |
1743 | ||
1744 | if (ulen < size0) | |
1745 | return -EINVAL; | |
1746 | ||
1747 | if (copy_from_user(&gf32, p, size0)) | |
1748 | return -EFAULT; | |
1749 | ||
1750 | gf.gf_interface = gf32.gf_interface; | |
1751 | gf.gf_fmode = gf32.gf_fmode; | |
1752 | num = gf.gf_numsrc = gf32.gf_numsrc; | |
1753 | gf.gf_group = gf32.gf_group; | |
1754 | ||
1755 | rtnl_lock(); | |
1756 | lock_sock(sk); | |
1757 | err = ip_mc_gsfget(sk, &gf, p->gf_slist); | |
1758 | release_sock(sk); | |
1759 | rtnl_unlock(); | |
1760 | if (err) | |
1761 | return err; | |
1762 | if (gf.gf_numsrc < num) | |
1763 | num = gf.gf_numsrc; | |
1764 | ulen = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32)); | |
1765 | if (put_user(ulen, optlen) || | |
1766 | put_user(gf.gf_fmode, &p->gf_fmode) || | |
1767 | put_user(gf.gf_numsrc, &p->gf_numsrc)) | |
1768 | return -EFAULT; | |
1769 | return 0; | |
1770 | } | |
42908c69 | 1771 | |
dd23198e DB |
1772 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1773 | MSG_CMSG_COMPAT); | |
42908c69 | 1774 | |
97adadda | 1775 | #if IS_ENABLED(CONFIG_BPFILTER_UMH) |
d2ba09c1 AS |
1776 | if (optname >= BPFILTER_IPT_SO_GET_INFO && |
1777 | optname < BPFILTER_IPT_GET_MAX) | |
1778 | err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); | |
1779 | #endif | |
3fdadf7d DM |
1780 | #ifdef CONFIG_NETFILTER |
1781 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1782 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1783 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1784 | int len; |
3fdadf7d | 1785 | |
543d9cfe | 1786 | if (get_user(len, optlen)) |
3fdadf7d DM |
1787 | return -EFAULT; |
1788 | ||
543d9cfe | 1789 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1790 | if (err >= 0) |
1791 | err = put_user(len, optlen); | |
1792 | return err; | |
1793 | } | |
1794 | #endif | |
1795 | return err; | |
1796 | } | |
543d9cfe | 1797 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1798 | #endif |