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Commit | Line | Data |
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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 | ||
563 | ||
564 | /* | |
4d52cfbe ED |
565 | * Socket option code for IP. This is the end of the line after any |
566 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 567 | */ |
baf606d9 MRL |
568 | static bool setsockopt_needs_rtnl(int optname) |
569 | { | |
570 | switch (optname) { | |
571 | case IP_ADD_MEMBERSHIP: | |
572 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 573 | case IP_BLOCK_SOURCE: |
baf606d9 | 574 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
575 | case IP_DROP_SOURCE_MEMBERSHIP: |
576 | case IP_MSFILTER: | |
577 | case IP_UNBLOCK_SOURCE: | |
578 | case MCAST_BLOCK_SOURCE: | |
579 | case MCAST_MSFILTER: | |
baf606d9 | 580 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 581 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 582 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
583 | case MCAST_LEAVE_SOURCE_GROUP: |
584 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
585 | return true; |
586 | } | |
587 | return false; | |
588 | } | |
1da177e4 | 589 | |
3fdadf7d | 590 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 591 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
592 | { |
593 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 594 | struct net *net = sock_net(sk); |
09cb105e | 595 | int val = 0, err; |
baf606d9 | 596 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 597 | |
0c9f79be XW |
598 | switch (optname) { |
599 | case IP_PKTINFO: | |
600 | case IP_RECVTTL: | |
601 | case IP_RECVOPTS: | |
602 | case IP_RECVTOS: | |
603 | case IP_RETOPTS: | |
604 | case IP_TOS: | |
605 | case IP_TTL: | |
606 | case IP_HDRINCL: | |
607 | case IP_MTU_DISCOVER: | |
608 | case IP_RECVERR: | |
609 | case IP_ROUTER_ALERT: | |
610 | case IP_FREEBIND: | |
611 | case IP_PASSSEC: | |
612 | case IP_TRANSPARENT: | |
613 | case IP_MINTTL: | |
614 | case IP_NODEFRAG: | |
90c337da | 615 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
616 | case IP_UNICAST_IF: |
617 | case IP_MULTICAST_TTL: | |
618 | case IP_MULTICAST_ALL: | |
619 | case IP_MULTICAST_LOOP: | |
620 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 621 | case IP_CHECKSUM: |
70ecc248 | 622 | case IP_RECVFRAGSIZE: |
1da177e4 LT |
623 | if (optlen >= sizeof(int)) { |
624 | if (get_user(val, (int __user *) optval)) | |
625 | return -EFAULT; | |
626 | } else if (optlen >= sizeof(char)) { | |
627 | unsigned char ucval; | |
628 | ||
629 | if (get_user(ucval, (unsigned char __user *) optval)) | |
630 | return -EFAULT; | |
631 | val = (int) ucval; | |
632 | } | |
633 | } | |
634 | ||
635 | /* If optlen==0, it is equivalent to val == 0 */ | |
636 | ||
0526947f KT |
637 | if (optname == IP_ROUTER_ALERT) |
638 | return ip_ra_control(sk, val ? 1 : 0, NULL); | |
6a9fb947 | 639 | if (ip_mroute_opt(optname)) |
09cb105e | 640 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
641 | |
642 | err = 0; | |
baf606d9 MRL |
643 | if (needs_rtnl) |
644 | rtnl_lock(); | |
1da177e4 LT |
645 | lock_sock(sk); |
646 | ||
647 | switch (optname) { | |
132adf54 SH |
648 | case IP_OPTIONS: |
649 | { | |
f6d8bd05 ED |
650 | struct ip_options_rcu *old, *opt = NULL; |
651 | ||
65a1c4ff | 652 | if (optlen > 40) |
132adf54 | 653 | goto e_inval; |
3b1e0a65 | 654 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 655 | optval, optlen); |
132adf54 SH |
656 | if (err) |
657 | break; | |
f6d8bd05 | 658 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 659 | lockdep_sock_is_held(sk)); |
132adf54 SH |
660 | if (inet->is_icsk) { |
661 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 662 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
663 | if (sk->sk_family == PF_INET || |
664 | (!((1 << sk->sk_state) & | |
665 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 666 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 667 | #endif |
f6d8bd05 ED |
668 | if (old) |
669 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 670 | if (opt) |
f6d8bd05 | 671 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 672 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 673 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 674 | } |
132adf54 | 675 | #endif |
1da177e4 | 676 | } |
f6d8bd05 ED |
677 | rcu_assign_pointer(inet->inet_opt, opt); |
678 | if (old) | |
605b4afe | 679 | kfree_rcu(old, rcu); |
132adf54 SH |
680 | break; |
681 | } | |
682 | case IP_PKTINFO: | |
683 | if (val) | |
684 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
685 | else | |
686 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
687 | break; | |
688 | case IP_RECVTTL: | |
689 | if (val) | |
690 | inet->cmsg_flags |= IP_CMSG_TTL; | |
691 | else | |
692 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
693 | break; | |
694 | case IP_RECVTOS: | |
695 | if (val) | |
696 | inet->cmsg_flags |= IP_CMSG_TOS; | |
697 | else | |
698 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
699 | break; | |
700 | case IP_RECVOPTS: | |
701 | if (val) | |
702 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
703 | else | |
704 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
705 | break; | |
706 | case IP_RETOPTS: | |
707 | if (val) | |
708 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
709 | else | |
710 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
711 | break; | |
712 | case IP_PASSSEC: | |
713 | if (val) | |
714 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
715 | else | |
716 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
717 | break; | |
e8b2dfe9 BS |
718 | case IP_RECVORIGDSTADDR: |
719 | if (val) | |
720 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
721 | else | |
722 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
723 | break; | |
ad6f939a TH |
724 | case IP_CHECKSUM: |
725 | if (val) { | |
726 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
727 | inet_inc_convert_csum(sk); | |
728 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
729 | } | |
730 | } else { | |
731 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
732 | inet_dec_convert_csum(sk); | |
733 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
734 | } | |
735 | } | |
736 | break; | |
70ecc248 WB |
737 | case IP_RECVFRAGSIZE: |
738 | if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) | |
739 | goto e_inval; | |
740 | if (val) | |
741 | inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; | |
742 | else | |
743 | inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; | |
744 | break; | |
132adf54 SH |
745 | case IP_TOS: /* This sets both TOS and Precedence */ |
746 | if (sk->sk_type == SOCK_STREAM) { | |
2c67e9ac MŻ |
747 | val &= ~INET_ECN_MASK; |
748 | val |= inet->tos & INET_ECN_MASK; | |
132adf54 | 749 | } |
132adf54 SH |
750 | if (inet->tos != val) { |
751 | inet->tos = val; | |
752 | sk->sk_priority = rt_tos2priority(val); | |
753 | sk_dst_reset(sk); | |
754 | } | |
755 | break; | |
756 | case IP_TTL: | |
4d52cfbe | 757 | if (optlen < 1) |
132adf54 | 758 | goto e_inval; |
c9be4a5c | 759 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
760 | goto e_inval; |
761 | inet->uc_ttl = val; | |
762 | break; | |
763 | case IP_HDRINCL: | |
764 | if (sk->sk_type != SOCK_RAW) { | |
765 | err = -ENOPROTOOPT; | |
2c7946a7 | 766 | break; |
132adf54 SH |
767 | } |
768 | inet->hdrincl = val ? 1 : 0; | |
769 | break; | |
7b2ff18e JO |
770 | case IP_NODEFRAG: |
771 | if (sk->sk_type != SOCK_RAW) { | |
772 | err = -ENOPROTOOPT; | |
773 | break; | |
774 | } | |
775 | inet->nodefrag = val ? 1 : 0; | |
776 | break; | |
90c337da ED |
777 | case IP_BIND_ADDRESS_NO_PORT: |
778 | inet->bind_address_no_port = val ? 1 : 0; | |
779 | break; | |
132adf54 | 780 | case IP_MTU_DISCOVER: |
1b346576 | 781 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
782 | goto e_inval; |
783 | inet->pmtudisc = val; | |
784 | break; | |
785 | case IP_RECVERR: | |
786 | inet->recverr = !!val; | |
787 | if (!val) | |
788 | skb_queue_purge(&sk->sk_error_queue); | |
789 | break; | |
790 | case IP_MULTICAST_TTL: | |
791 | if (sk->sk_type == SOCK_STREAM) | |
792 | goto e_inval; | |
4d52cfbe | 793 | if (optlen < 1) |
132adf54 | 794 | goto e_inval; |
09cb105e | 795 | if (val == -1) |
132adf54 SH |
796 | val = 1; |
797 | if (val < 0 || val > 255) | |
798 | goto e_inval; | |
799 | inet->mc_ttl = val; | |
800 | break; | |
801 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 802 | if (optlen < 1) |
132adf54 SH |
803 | goto e_inval; |
804 | inet->mc_loop = !!val; | |
805 | break; | |
76e21053 EH |
806 | case IP_UNICAST_IF: |
807 | { | |
808 | struct net_device *dev = NULL; | |
809 | int ifindex; | |
9515a2e0 | 810 | int midx; |
76e21053 EH |
811 | |
812 | if (optlen != sizeof(int)) | |
813 | goto e_inval; | |
814 | ||
815 | ifindex = (__force int)ntohl((__force __be32)val); | |
816 | if (ifindex == 0) { | |
817 | inet->uc_index = 0; | |
818 | err = 0; | |
819 | break; | |
820 | } | |
821 | ||
822 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
823 | err = -EADDRNOTAVAIL; | |
824 | if (!dev) | |
825 | break; | |
9515a2e0 DA |
826 | |
827 | midx = l3mdev_master_ifindex(dev); | |
76e21053 EH |
828 | dev_put(dev); |
829 | ||
830 | err = -EINVAL; | |
9515a2e0 DA |
831 | if (sk->sk_bound_dev_if && |
832 | (!midx || midx != sk->sk_bound_dev_if)) | |
76e21053 EH |
833 | break; |
834 | ||
835 | inet->uc_index = ifindex; | |
836 | err = 0; | |
837 | break; | |
838 | } | |
132adf54 SH |
839 | case IP_MULTICAST_IF: |
840 | { | |
841 | struct ip_mreqn mreq; | |
842 | struct net_device *dev = NULL; | |
7bb387c5 | 843 | int midx; |
132adf54 SH |
844 | |
845 | if (sk->sk_type == SOCK_STREAM) | |
846 | goto e_inval; | |
847 | /* | |
848 | * Check the arguments are allowable | |
849 | */ | |
850 | ||
0915921b SW |
851 | if (optlen < sizeof(struct in_addr)) |
852 | goto e_inval; | |
853 | ||
132adf54 SH |
854 | err = -EFAULT; |
855 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 856 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 857 | break; |
132adf54 SH |
858 | } else { |
859 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
860 | if (optlen >= sizeof(struct ip_mreq)) { |
861 | if (copy_from_user(&mreq, optval, | |
862 | sizeof(struct ip_mreq))) | |
863 | break; | |
864 | } else if (optlen >= sizeof(struct in_addr)) { | |
865 | if (copy_from_user(&mreq.imr_address, optval, | |
866 | sizeof(struct in_addr))) | |
867 | break; | |
868 | } | |
132adf54 SH |
869 | } |
870 | ||
871 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 872 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
873 | inet->mc_index = 0; |
874 | inet->mc_addr = 0; | |
875 | err = 0; | |
1da177e4 LT |
876 | break; |
877 | } | |
3b1e0a65 | 878 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 879 | if (dev) |
132adf54 | 880 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 881 | } else |
55b80503 | 882 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 883 | |
1da177e4 | 884 | |
132adf54 SH |
885 | err = -EADDRNOTAVAIL; |
886 | if (!dev) | |
887 | break; | |
7bb387c5 DA |
888 | |
889 | midx = l3mdev_master_ifindex(dev); | |
890 | ||
55b80503 | 891 | dev_put(dev); |
132adf54 SH |
892 | |
893 | err = -EINVAL; | |
894 | if (sk->sk_bound_dev_if && | |
7bb387c5 DA |
895 | mreq.imr_ifindex != sk->sk_bound_dev_if && |
896 | (!midx || midx != sk->sk_bound_dev_if)) | |
132adf54 | 897 | break; |
1da177e4 | 898 | |
132adf54 SH |
899 | inet->mc_index = mreq.imr_ifindex; |
900 | inet->mc_addr = mreq.imr_address.s_addr; | |
901 | err = 0; | |
902 | break; | |
903 | } | |
1da177e4 | 904 | |
132adf54 SH |
905 | case IP_ADD_MEMBERSHIP: |
906 | case IP_DROP_MEMBERSHIP: | |
907 | { | |
908 | struct ip_mreqn mreq; | |
1da177e4 | 909 | |
a96fb49b FL |
910 | err = -EPROTO; |
911 | if (inet_sk(sk)->is_icsk) | |
912 | break; | |
913 | ||
132adf54 SH |
914 | if (optlen < sizeof(struct ip_mreq)) |
915 | goto e_inval; | |
916 | err = -EFAULT; | |
917 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 918 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 919 | break; |
132adf54 SH |
920 | } else { |
921 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 922 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 923 | break; |
132adf54 | 924 | } |
1da177e4 | 925 | |
132adf54 | 926 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 927 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 928 | else |
54ff9ef3 | 929 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
930 | break; |
931 | } | |
932 | case IP_MSFILTER: | |
933 | { | |
132adf54 SH |
934 | struct ip_msfilter *msf; |
935 | ||
936 | if (optlen < IP_MSFILTER_SIZE(0)) | |
937 | goto e_inval; | |
938 | if (optlen > sysctl_optmem_max) { | |
939 | err = -ENOBUFS; | |
1da177e4 LT |
940 | break; |
941 | } | |
a2c841d9 AV |
942 | msf = memdup_user(optval, optlen); |
943 | if (IS_ERR(msf)) { | |
944 | err = PTR_ERR(msf); | |
132adf54 SH |
945 | break; |
946 | } | |
947 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
948 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 949 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
950 | kfree(msf); |
951 | err = -ENOBUFS; | |
952 | break; | |
953 | } | |
954 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
955 | kfree(msf); | |
956 | err = -EINVAL; | |
957 | break; | |
958 | } | |
959 | err = ip_mc_msfilter(sk, msf, 0); | |
960 | kfree(msf); | |
961 | break; | |
962 | } | |
963 | case IP_BLOCK_SOURCE: | |
964 | case IP_UNBLOCK_SOURCE: | |
965 | case IP_ADD_SOURCE_MEMBERSHIP: | |
966 | case IP_DROP_SOURCE_MEMBERSHIP: | |
967 | { | |
968 | struct ip_mreq_source mreqs; | |
969 | int omode, add; | |
1da177e4 | 970 | |
132adf54 SH |
971 | if (optlen != sizeof(struct ip_mreq_source)) |
972 | goto e_inval; | |
973 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 974 | err = -EFAULT; |
1da177e4 LT |
975 | break; |
976 | } | |
132adf54 SH |
977 | if (optname == IP_BLOCK_SOURCE) { |
978 | omode = MCAST_EXCLUDE; | |
979 | add = 1; | |
980 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
981 | omode = MCAST_EXCLUDE; | |
982 | add = 0; | |
983 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
984 | struct ip_mreqn mreq; | |
1da177e4 | 985 | |
132adf54 SH |
986 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
987 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
988 | mreq.imr_ifindex = 0; | |
6e2059b5 | 989 | err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); |
132adf54 | 990 | if (err && err != -EADDRINUSE) |
1da177e4 | 991 | break; |
132adf54 SH |
992 | omode = MCAST_INCLUDE; |
993 | add = 1; | |
994 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
995 | omode = MCAST_INCLUDE; | |
996 | add = 0; | |
997 | } | |
998 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
999 | break; | |
1000 | } | |
1001 | case MCAST_JOIN_GROUP: | |
1002 | case MCAST_LEAVE_GROUP: | |
1003 | { | |
1004 | struct group_req greq; | |
1005 | struct sockaddr_in *psin; | |
1006 | struct ip_mreqn mreq; | |
1007 | ||
1008 | if (optlen < sizeof(struct group_req)) | |
1009 | goto e_inval; | |
1010 | err = -EFAULT; | |
1011 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
1012 | break; | |
1013 | psin = (struct sockaddr_in *)&greq.gr_group; | |
1014 | if (psin->sin_family != AF_INET) | |
1015 | goto e_inval; | |
1016 | memset(&mreq, 0, sizeof(mreq)); | |
1017 | mreq.imr_multiaddr = psin->sin_addr; | |
1018 | mreq.imr_ifindex = greq.gr_interface; | |
1019 | ||
1020 | if (optname == MCAST_JOIN_GROUP) | |
54ff9ef3 | 1021 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1022 | else |
54ff9ef3 | 1023 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1024 | break; |
1025 | } | |
1026 | case MCAST_JOIN_SOURCE_GROUP: | |
1027 | case MCAST_LEAVE_SOURCE_GROUP: | |
1028 | case MCAST_BLOCK_SOURCE: | |
1029 | case MCAST_UNBLOCK_SOURCE: | |
1030 | { | |
1031 | struct group_source_req greqs; | |
1032 | struct ip_mreq_source mreqs; | |
1033 | struct sockaddr_in *psin; | |
1034 | int omode, add; | |
1035 | ||
1036 | if (optlen != sizeof(struct group_source_req)) | |
1037 | goto e_inval; | |
1038 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { | |
1da177e4 | 1039 | err = -EFAULT; |
1da177e4 LT |
1040 | break; |
1041 | } | |
132adf54 SH |
1042 | if (greqs.gsr_group.ss_family != AF_INET || |
1043 | greqs.gsr_source.ss_family != AF_INET) { | |
1044 | err = -EADDRNOTAVAIL; | |
1da177e4 LT |
1045 | break; |
1046 | } | |
132adf54 SH |
1047 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1048 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; | |
1049 | psin = (struct sockaddr_in *)&greqs.gsr_source; | |
1050 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; | |
1051 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
1052 | ||
1053 | if (optname == MCAST_BLOCK_SOURCE) { | |
1054 | omode = MCAST_EXCLUDE; | |
1055 | add = 1; | |
1056 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
1057 | omode = MCAST_EXCLUDE; | |
1058 | add = 0; | |
1059 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
1da177e4 LT |
1060 | struct ip_mreqn mreq; |
1061 | ||
132adf54 | 1062 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
1da177e4 | 1063 | mreq.imr_multiaddr = psin->sin_addr; |
132adf54 SH |
1064 | mreq.imr_address.s_addr = 0; |
1065 | mreq.imr_ifindex = greqs.gsr_interface; | |
6e2059b5 | 1066 | err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); |
132adf54 SH |
1067 | if (err && err != -EADDRINUSE) |
1068 | break; | |
1069 | greqs.gsr_interface = mreq.imr_ifindex; | |
1070 | omode = MCAST_INCLUDE; | |
1071 | add = 1; | |
1072 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
1073 | omode = MCAST_INCLUDE; | |
1074 | add = 0; | |
1075 | } | |
1076 | err = ip_mc_source(add, omode, sk, &mreqs, | |
1077 | greqs.gsr_interface); | |
1078 | break; | |
1079 | } | |
1080 | case MCAST_MSFILTER: | |
1081 | { | |
132adf54 SH |
1082 | struct sockaddr_in *psin; |
1083 | struct ip_msfilter *msf = NULL; | |
1084 | struct group_filter *gsf = NULL; | |
1085 | int msize, i, ifindex; | |
1086 | ||
1087 | if (optlen < GROUP_FILTER_SIZE(0)) | |
1088 | goto e_inval; | |
1089 | if (optlen > sysctl_optmem_max) { | |
1090 | err = -ENOBUFS; | |
1da177e4 LT |
1091 | break; |
1092 | } | |
a2c841d9 AV |
1093 | gsf = memdup_user(optval, optlen); |
1094 | if (IS_ERR(gsf)) { | |
1095 | err = PTR_ERR(gsf); | |
1da177e4 LT |
1096 | break; |
1097 | } | |
4d52cfbe | 1098 | |
132adf54 SH |
1099 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
1100 | if (gsf->gf_numsrc >= 0x1ffffff || | |
166b6b2d | 1101 | gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1102 | err = -ENOBUFS; |
1103 | goto mc_msf_out; | |
1104 | } | |
1105 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { | |
1106 | err = -EINVAL; | |
1107 | goto mc_msf_out; | |
1108 | } | |
1109 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); | |
09cb105e | 1110 | msf = kmalloc(msize, GFP_KERNEL); |
cfcabdcc | 1111 | if (!msf) { |
132adf54 SH |
1112 | err = -ENOBUFS; |
1113 | goto mc_msf_out; | |
1114 | } | |
1115 | ifindex = gsf->gf_interface; | |
1116 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
1117 | if (psin->sin_family != AF_INET) { | |
1da177e4 | 1118 | err = -EADDRNOTAVAIL; |
132adf54 | 1119 | goto mc_msf_out; |
1da177e4 | 1120 | } |
132adf54 SH |
1121 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
1122 | msf->imsf_interface = 0; | |
1123 | msf->imsf_fmode = gsf->gf_fmode; | |
1124 | msf->imsf_numsrc = gsf->gf_numsrc; | |
1125 | err = -EADDRNOTAVAIL; | |
4d52cfbe | 1126 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
132adf54 | 1127 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
e905a9ed | 1128 | |
132adf54 SH |
1129 | if (psin->sin_family != AF_INET) |
1130 | goto mc_msf_out; | |
1131 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
1132 | } | |
1133 | kfree(gsf); | |
1134 | gsf = NULL; | |
1135 | ||
1136 | err = ip_mc_msfilter(sk, msf, ifindex); | |
4d52cfbe | 1137 | mc_msf_out: |
132adf54 SH |
1138 | kfree(msf); |
1139 | kfree(gsf); | |
1140 | break; | |
1141 | } | |
f771bef9 NS |
1142 | case IP_MULTICAST_ALL: |
1143 | if (optlen < 1) | |
1144 | goto e_inval; | |
1145 | if (val != 0 && val != 1) | |
1146 | goto e_inval; | |
1147 | inet->mc_all = val; | |
1148 | break; | |
132adf54 SH |
1149 | |
1150 | case IP_FREEBIND: | |
4d52cfbe | 1151 | if (optlen < 1) |
132adf54 SH |
1152 | goto e_inval; |
1153 | inet->freebind = !!val; | |
1154 | break; | |
1155 | ||
1156 | case IP_IPSEC_POLICY: | |
1157 | case IP_XFRM_POLICY: | |
1158 | err = -EPERM; | |
52e804c6 | 1159 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1160 | break; |
132adf54 SH |
1161 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1162 | break; | |
1da177e4 | 1163 | |
f5715aea | 1164 | case IP_TRANSPARENT: |
52e804c6 EB |
1165 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1166 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1167 | err = -EPERM; |
1168 | break; | |
1169 | } | |
1170 | if (optlen < 1) | |
1171 | goto e_inval; | |
1172 | inet->transparent = !!val; | |
1173 | break; | |
1174 | ||
d218d111 SH |
1175 | case IP_MINTTL: |
1176 | if (optlen < 1) | |
1177 | goto e_inval; | |
1178 | if (val < 0 || val > 255) | |
1179 | goto e_inval; | |
1180 | inet->min_ttl = val; | |
1181 | break; | |
1182 | ||
132adf54 SH |
1183 | default: |
1184 | err = -ENOPROTOOPT; | |
1185 | break; | |
1da177e4 LT |
1186 | } |
1187 | release_sock(sk); | |
baf606d9 MRL |
1188 | if (needs_rtnl) |
1189 | rtnl_unlock(); | |
1da177e4 LT |
1190 | return err; |
1191 | ||
1192 | e_inval: | |
1193 | release_sock(sk); | |
baf606d9 MRL |
1194 | if (needs_rtnl) |
1195 | rtnl_unlock(); | |
1da177e4 LT |
1196 | return -EINVAL; |
1197 | } | |
1198 | ||
f84af32c | 1199 | /** |
829ae9d6 | 1200 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1201 | * @sk: socket |
1202 | * @skb: buffer | |
1203 | * | |
35ebf65e DM |
1204 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1205 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1206 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1207 | */ |
fbf8866d | 1208 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1209 | { |
d826eb14 | 1210 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1211 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1212 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1213 | |
4b261c75 | 1214 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1215 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1216 | * which has interface index (iif) as the first member of the | |
1217 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1218 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
f0c16ba8 WZ |
1219 | * element so the iif is picked up from the prior IPCB. If iif |
1220 | * is the loopback interface, then return the sending interface | |
1221 | * (e.g., process binds socket to eth0 for Tx which is | |
1222 | * redirected to loopback in the rtable/dst). | |
0b922b7a | 1223 | */ |
cbea8f02 DA |
1224 | struct rtable *rt = skb_rtable(skb); |
1225 | bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); | |
1226 | ||
1227 | if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) | |
f0c16ba8 | 1228 | pktinfo->ipi_ifindex = inet_iif(skb); |
cbea8f02 DA |
1229 | else if (l3slave && rt && rt->rt_iif) |
1230 | pktinfo->ipi_ifindex = rt->rt_iif; | |
f0c16ba8 | 1231 | |
35ebf65e | 1232 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1233 | } else { |
1234 | pktinfo->ipi_ifindex = 0; | |
1235 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1236 | } | |
61a1030b | 1237 | skb_dst_drop(skb); |
f84af32c | 1238 | } |
f84af32c | 1239 | |
3fdadf7d | 1240 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1241 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1242 | { |
1243 | int err; | |
1244 | ||
1245 | if (level != SOL_IP) | |
1246 | return -ENOPROTOOPT; | |
1247 | ||
1248 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
97adadda | 1249 | #if IS_ENABLED(CONFIG_BPFILTER_UMH) |
d2ba09c1 AS |
1250 | if (optname >= BPFILTER_IPT_SO_SET_REPLACE && |
1251 | optname < BPFILTER_IPT_SET_MAX) | |
1252 | err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); | |
1253 | #endif | |
3fdadf7d DM |
1254 | #ifdef CONFIG_NETFILTER |
1255 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1256 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1257 | optname != IP_IPSEC_POLICY && |
1258 | optname != IP_XFRM_POLICY && | |
3f34cfae | 1259 | !ip_mroute_opt(optname)) |
3fdadf7d | 1260 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
3fdadf7d DM |
1261 | #endif |
1262 | return err; | |
1263 | } | |
4d52cfbe | 1264 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d DM |
1265 | |
1266 | #ifdef CONFIG_COMPAT | |
543d9cfe | 1267 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1268 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1269 | { |
1270 | int err; | |
1271 | ||
1272 | if (level != SOL_IP) | |
1273 | return -ENOPROTOOPT; | |
1274 | ||
dae50295 DS |
1275 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
1276 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, | |
1277 | ip_setsockopt); | |
1278 | ||
3fdadf7d DM |
1279 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
1280 | #ifdef CONFIG_NETFILTER | |
1281 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1282 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1283 | optname != IP_IPSEC_POLICY && |
1284 | optname != IP_XFRM_POLICY && | |
3f34cfae PA |
1285 | !ip_mroute_opt(optname)) |
1286 | err = compat_nf_setsockopt(sk, PF_INET, optname, optval, | |
1287 | optlen); | |
3fdadf7d DM |
1288 | #endif |
1289 | return err; | |
1290 | } | |
543d9cfe | 1291 | EXPORT_SYMBOL(compat_ip_setsockopt); |
3fdadf7d DM |
1292 | #endif |
1293 | ||
1da177e4 | 1294 | /* |
4d52cfbe ED |
1295 | * Get the options. Note for future reference. The GET of IP options gets |
1296 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1297 | */ |
1298 | ||
87e9f031 WC |
1299 | static bool getsockopt_needs_rtnl(int optname) |
1300 | { | |
1301 | switch (optname) { | |
1302 | case IP_MSFILTER: | |
1303 | case MCAST_MSFILTER: | |
1304 | return true; | |
1305 | } | |
1306 | return false; | |
1307 | } | |
1308 | ||
3fdadf7d | 1309 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
95c96174 | 1310 | char __user *optval, int __user *optlen, unsigned int flags) |
1da177e4 LT |
1311 | { |
1312 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1313 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1314 | int val, err = 0; | |
1da177e4 | 1315 | int len; |
e905a9ed | 1316 | |
132adf54 | 1317 | if (level != SOL_IP) |
1da177e4 LT |
1318 | return -EOPNOTSUPP; |
1319 | ||
6a9fb947 | 1320 | if (ip_mroute_opt(optname)) |
09cb105e | 1321 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1322 | |
09cb105e | 1323 | if (get_user(len, optlen)) |
1da177e4 | 1324 | return -EFAULT; |
132adf54 | 1325 | if (len < 0) |
1da177e4 | 1326 | return -EINVAL; |
e905a9ed | 1327 | |
87e9f031 WC |
1328 | if (needs_rtnl) |
1329 | rtnl_lock(); | |
1da177e4 LT |
1330 | lock_sock(sk); |
1331 | ||
132adf54 SH |
1332 | switch (optname) { |
1333 | case IP_OPTIONS: | |
1334 | { | |
1335 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1336 | struct ip_options *opt = (struct ip_options *)optbuf; |
1337 | struct ip_options_rcu *inet_opt; | |
1338 | ||
1339 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1340 | lockdep_sock_is_held(sk)); |
132adf54 | 1341 | opt->optlen = 0; |
f6d8bd05 ED |
1342 | if (inet_opt) |
1343 | memcpy(optbuf, &inet_opt->opt, | |
1344 | sizeof(struct ip_options) + | |
1345 | inet_opt->opt.optlen); | |
132adf54 SH |
1346 | release_sock(sk); |
1347 | ||
1348 | if (opt->optlen == 0) | |
1349 | return put_user(0, optlen); | |
1350 | ||
1351 | ip_options_undo(opt); | |
1352 | ||
1353 | len = min_t(unsigned int, len, opt->optlen); | |
1354 | if (put_user(len, optlen)) | |
1355 | return -EFAULT; | |
1356 | if (copy_to_user(optval, opt->__data, len)) | |
1357 | return -EFAULT; | |
1358 | return 0; | |
1359 | } | |
1360 | case IP_PKTINFO: | |
1361 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1362 | break; | |
1363 | case IP_RECVTTL: | |
1364 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1365 | break; | |
1366 | case IP_RECVTOS: | |
1367 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1368 | break; | |
1369 | case IP_RECVOPTS: | |
1370 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1371 | break; | |
1372 | case IP_RETOPTS: | |
1373 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1374 | break; | |
1375 | case IP_PASSSEC: | |
1376 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1377 | break; | |
e8b2dfe9 BS |
1378 | case IP_RECVORIGDSTADDR: |
1379 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1380 | break; | |
ad6f939a TH |
1381 | case IP_CHECKSUM: |
1382 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1383 | break; | |
70ecc248 WB |
1384 | case IP_RECVFRAGSIZE: |
1385 | val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; | |
1386 | break; | |
132adf54 SH |
1387 | case IP_TOS: |
1388 | val = inet->tos; | |
1389 | break; | |
1390 | case IP_TTL: | |
fa50d974 NB |
1391 | { |
1392 | struct net *net = sock_net(sk); | |
132adf54 | 1393 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1394 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1395 | inet->uc_ttl); |
1396 | break; | |
fa50d974 | 1397 | } |
132adf54 SH |
1398 | case IP_HDRINCL: |
1399 | val = inet->hdrincl; | |
1400 | break; | |
a89b4763 MK |
1401 | case IP_NODEFRAG: |
1402 | val = inet->nodefrag; | |
1403 | break; | |
90c337da ED |
1404 | case IP_BIND_ADDRESS_NO_PORT: |
1405 | val = inet->bind_address_no_port; | |
1406 | break; | |
132adf54 SH |
1407 | case IP_MTU_DISCOVER: |
1408 | val = inet->pmtudisc; | |
1409 | break; | |
1410 | case IP_MTU: | |
1411 | { | |
1412 | struct dst_entry *dst; | |
1413 | val = 0; | |
1414 | dst = sk_dst_get(sk); | |
1415 | if (dst) { | |
1416 | val = dst_mtu(dst); | |
1417 | dst_release(dst); | |
1da177e4 | 1418 | } |
132adf54 | 1419 | if (!val) { |
1da177e4 | 1420 | release_sock(sk); |
132adf54 | 1421 | return -ENOTCONN; |
1da177e4 | 1422 | } |
132adf54 SH |
1423 | break; |
1424 | } | |
1425 | case IP_RECVERR: | |
1426 | val = inet->recverr; | |
1427 | break; | |
1428 | case IP_MULTICAST_TTL: | |
1429 | val = inet->mc_ttl; | |
1430 | break; | |
1431 | case IP_MULTICAST_LOOP: | |
1432 | val = inet->mc_loop; | |
1433 | break; | |
76e21053 EH |
1434 | case IP_UNICAST_IF: |
1435 | val = (__force int)htonl((__u32) inet->uc_index); | |
1436 | break; | |
132adf54 SH |
1437 | case IP_MULTICAST_IF: |
1438 | { | |
1439 | struct in_addr addr; | |
1440 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1441 | addr.s_addr = inet->mc_addr; | |
1442 | release_sock(sk); | |
1da177e4 | 1443 | |
132adf54 SH |
1444 | if (put_user(len, optlen)) |
1445 | return -EFAULT; | |
1446 | if (copy_to_user(optval, &addr, len)) | |
1447 | return -EFAULT; | |
1448 | return 0; | |
1449 | } | |
1450 | case IP_MSFILTER: | |
1451 | { | |
1452 | struct ip_msfilter msf; | |
132adf54 SH |
1453 | |
1454 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1455 | err = -EINVAL; |
1456 | goto out; | |
1da177e4 | 1457 | } |
132adf54 | 1458 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1459 | err = -EFAULT; |
1460 | goto out; | |
1da177e4 | 1461 | } |
132adf54 SH |
1462 | err = ip_mc_msfget(sk, &msf, |
1463 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1464 | goto out; |
132adf54 SH |
1465 | } |
1466 | case MCAST_MSFILTER: | |
1467 | { | |
1468 | struct group_filter gsf; | |
1da177e4 | 1469 | |
132adf54 | 1470 | if (len < GROUP_FILTER_SIZE(0)) { |
87e9f031 WC |
1471 | err = -EINVAL; |
1472 | goto out; | |
132adf54 SH |
1473 | } |
1474 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { | |
87e9f031 WC |
1475 | err = -EFAULT; |
1476 | goto out; | |
132adf54 SH |
1477 | } |
1478 | err = ip_mc_gsfget(sk, &gsf, | |
4d52cfbe ED |
1479 | (struct group_filter __user *)optval, |
1480 | optlen); | |
87e9f031 | 1481 | goto out; |
132adf54 | 1482 | } |
f771bef9 NS |
1483 | case IP_MULTICAST_ALL: |
1484 | val = inet->mc_all; | |
1485 | break; | |
132adf54 SH |
1486 | case IP_PKTOPTIONS: |
1487 | { | |
1488 | struct msghdr msg; | |
1da177e4 | 1489 | |
132adf54 | 1490 | release_sock(sk); |
1da177e4 | 1491 | |
132adf54 SH |
1492 | if (sk->sk_type != SOCK_STREAM) |
1493 | return -ENOPROTOOPT; | |
1da177e4 | 1494 | |
c54a5e02 | 1495 | msg.msg_control = (__force void *) optval; |
132adf54 | 1496 | msg.msg_controllen = len; |
dd23198e | 1497 | msg.msg_flags = flags; |
1da177e4 | 1498 | |
132adf54 SH |
1499 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1500 | struct in_pktinfo info; | |
1501 | ||
c720c7e8 ED |
1502 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1503 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1504 | info.ipi_ifindex = inet->mc_index; |
1505 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1506 | } |
132adf54 SH |
1507 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1508 | int hlim = inet->mc_ttl; | |
1509 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1510 | } | |
4c507d28 JB |
1511 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1512 | int tos = inet->rcv_tos; | |
1513 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1514 | } | |
132adf54 SH |
1515 | len -= msg.msg_controllen; |
1516 | return put_user(len, optlen); | |
1517 | } | |
1518 | case IP_FREEBIND: | |
1519 | val = inet->freebind; | |
1520 | break; | |
f5715aea KK |
1521 | case IP_TRANSPARENT: |
1522 | val = inet->transparent; | |
1523 | break; | |
d218d111 SH |
1524 | case IP_MINTTL: |
1525 | val = inet->min_ttl; | |
1526 | break; | |
132adf54 SH |
1527 | default: |
1528 | release_sock(sk); | |
1529 | return -ENOPROTOOPT; | |
1da177e4 LT |
1530 | } |
1531 | release_sock(sk); | |
e905a9ed | 1532 | |
4d52cfbe | 1533 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1534 | unsigned char ucval = (unsigned char)val; |
1535 | len = 1; | |
132adf54 | 1536 | if (put_user(len, optlen)) |
1da177e4 | 1537 | return -EFAULT; |
09cb105e | 1538 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1539 | return -EFAULT; |
1540 | } else { | |
1541 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1542 | if (put_user(len, optlen)) |
1da177e4 | 1543 | return -EFAULT; |
09cb105e | 1544 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1545 | return -EFAULT; |
1546 | } | |
1547 | return 0; | |
87e9f031 WC |
1548 | |
1549 | out: | |
1550 | release_sock(sk); | |
1551 | if (needs_rtnl) | |
1552 | rtnl_unlock(); | |
1553 | return err; | |
1da177e4 LT |
1554 | } |
1555 | ||
3fdadf7d | 1556 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1557 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1558 | { |
1559 | int err; | |
1560 | ||
dd23198e | 1561 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
97adadda | 1562 | #if IS_ENABLED(CONFIG_BPFILTER_UMH) |
d2ba09c1 AS |
1563 | if (optname >= BPFILTER_IPT_SO_GET_INFO && |
1564 | optname < BPFILTER_IPT_GET_MAX) | |
1565 | err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); | |
1566 | #endif | |
3fdadf7d DM |
1567 | #ifdef CONFIG_NETFILTER |
1568 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1569 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1570 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1571 | int len; |
3fdadf7d | 1572 | |
09cb105e | 1573 | if (get_user(len, optlen)) |
3fdadf7d DM |
1574 | return -EFAULT; |
1575 | ||
01ea306f | 1576 | err = nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1577 | if (err >= 0) |
1578 | err = put_user(len, optlen); | |
1579 | return err; | |
1580 | } | |
1581 | #endif | |
1582 | return err; | |
1583 | } | |
4d52cfbe | 1584 | EXPORT_SYMBOL(ip_getsockopt); |
3fdadf7d DM |
1585 | |
1586 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
1587 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
1588 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1589 | { |
42908c69 DS |
1590 | int err; |
1591 | ||
1592 | if (optname == MCAST_MSFILTER) | |
1593 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, | |
1594 | ip_getsockopt); | |
1595 | ||
dd23198e DB |
1596 | err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
1597 | MSG_CMSG_COMPAT); | |
42908c69 | 1598 | |
97adadda | 1599 | #if IS_ENABLED(CONFIG_BPFILTER_UMH) |
d2ba09c1 AS |
1600 | if (optname >= BPFILTER_IPT_SO_GET_INFO && |
1601 | optname < BPFILTER_IPT_GET_MAX) | |
1602 | err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); | |
1603 | #endif | |
3fdadf7d DM |
1604 | #ifdef CONFIG_NETFILTER |
1605 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1606 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1607 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1608 | int len; |
3fdadf7d | 1609 | |
543d9cfe | 1610 | if (get_user(len, optlen)) |
3fdadf7d DM |
1611 | return -EFAULT; |
1612 | ||
543d9cfe | 1613 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1614 | if (err >= 0) |
1615 | err = put_user(len, optlen); | |
1616 | return err; | |
1617 | } | |
1618 | #endif | |
1619 | return err; | |
1620 | } | |
543d9cfe | 1621 | EXPORT_SYMBOL(compat_ip_getsockopt); |
3fdadf7d | 1622 | #endif |