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)) { |
eba75c58 WB |
414 | if (inet_sk(sk)->recverr_rfc4884) |
415 | ip_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884); | |
416 | ||
bd82393c ACM |
417 | skb_reset_transport_header(skb); |
418 | if (sock_queue_err_skb(sk, skb) == 0) | |
419 | return; | |
420 | } | |
421 | kfree_skb(skb); | |
1da177e4 LT |
422 | } |
423 | ||
0579016e | 424 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
1da177e4 LT |
425 | { |
426 | struct inet_sock *inet = inet_sk(sk); | |
427 | struct sock_exterr_skb *serr; | |
428 | struct iphdr *iph; | |
429 | struct sk_buff *skb; | |
430 | ||
431 | if (!inet->recverr) | |
432 | return; | |
433 | ||
434 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); | |
435 | if (!skb) | |
436 | return; | |
437 | ||
2ca9e6f2 ACM |
438 | skb_put(skb, sizeof(struct iphdr)); |
439 | skb_reset_network_header(skb); | |
eddc9ec5 | 440 | iph = ip_hdr(skb); |
1da177e4 LT |
441 | iph->daddr = daddr; |
442 | ||
e905a9ed | 443 | serr = SKB_EXT_ERR(skb); |
1da177e4 LT |
444 | serr->ee.ee_errno = err; |
445 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
e905a9ed | 446 | serr->ee.ee_type = 0; |
1da177e4 LT |
447 | serr->ee.ee_code = 0; |
448 | serr->ee.ee_pad = 0; | |
449 | serr->ee.ee_info = info; | |
450 | serr->ee.ee_data = 0; | |
d56f90a7 | 451 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1da177e4 LT |
452 | serr->port = port; |
453 | ||
27a884dc | 454 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 455 | skb_reset_transport_header(skb); |
1da177e4 LT |
456 | |
457 | if (sock_queue_err_skb(sk, skb)) | |
458 | kfree_skb(skb); | |
459 | } | |
460 | ||
34b99df4 JA |
461 | /* For some errors we have valid addr_offset even with zero payload and |
462 | * zero port. Also, addr_offset should be supported if port is set. | |
463 | */ | |
464 | static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) | |
465 | { | |
466 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
467 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
468 | } | |
469 | ||
c247f053 WB |
470 | /* IPv4 supports cmsg on all imcp errors and some timestamps |
471 | * | |
472 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
473 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
474 | */ | |
475 | static bool ipv4_datagram_support_cmsg(const struct sock *sk, | |
476 | struct sk_buff *skb, | |
477 | int ee_origin) | |
829ae9d6 | 478 | { |
c247f053 WB |
479 | struct in_pktinfo *info; |
480 | ||
481 | if (ee_origin == SO_EE_ORIGIN_ICMP) | |
482 | return true; | |
829ae9d6 | 483 | |
c247f053 WB |
484 | if (ee_origin == SO_EE_ORIGIN_LOCAL) |
485 | return false; | |
486 | ||
487 | /* Support IP_PKTINFO on tstamp packets if requested, to correlate | |
1862d620 | 488 | * timestamp with egress dev. Not possible for packets without iif |
c247f053 WB |
489 | * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). |
490 | */ | |
1862d620 WB |
491 | info = PKTINFO_SKB_CB(skb); |
492 | if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || | |
493 | !info->ipi_ifindex) | |
829ae9d6 WB |
494 | return false; |
495 | ||
496 | info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; | |
829ae9d6 WB |
497 | return true; |
498 | } | |
499 | ||
e905a9ed | 500 | /* |
1da177e4 LT |
501 | * Handle MSG_ERRQUEUE |
502 | */ | |
85fbaa75 | 503 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
504 | { |
505 | struct sock_exterr_skb *serr; | |
364a9e93 | 506 | struct sk_buff *skb; |
342dfc30 | 507 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
1da177e4 LT |
508 | struct { |
509 | struct sock_extended_err ee; | |
510 | struct sockaddr_in offender; | |
511 | } errhdr; | |
512 | int err; | |
513 | int copied; | |
514 | ||
515 | err = -EAGAIN; | |
364a9e93 | 516 | skb = sock_dequeue_err_skb(sk); |
51456b29 | 517 | if (!skb) |
1da177e4 LT |
518 | goto out; |
519 | ||
520 | copied = skb->len; | |
521 | if (copied > len) { | |
522 | msg->msg_flags |= MSG_TRUNC; | |
523 | copied = len; | |
524 | } | |
51f3d02b | 525 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
526 | if (unlikely(err)) { |
527 | kfree_skb(skb); | |
528 | return err; | |
529 | } | |
1da177e4 LT |
530 | sock_recv_timestamp(msg, sk, skb); |
531 | ||
532 | serr = SKB_EXT_ERR(skb); | |
533 | ||
34b99df4 | 534 | if (sin && ipv4_datagram_support_addr(serr)) { |
1da177e4 | 535 | sin->sin_family = AF_INET; |
d56f90a7 ACM |
536 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
537 | serr->addr_offset); | |
1da177e4 LT |
538 | sin->sin_port = serr->port; |
539 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
85fbaa75 | 540 | *addr_len = sizeof(*sin); |
1da177e4 LT |
541 | } |
542 | ||
543 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
544 | sin = &errhdr.offender; | |
f812116b | 545 | memset(sin, 0, sizeof(*sin)); |
829ae9d6 | 546 | |
c247f053 | 547 | if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
1da177e4 | 548 | sin->sin_family = AF_INET; |
eddc9ec5 | 549 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
f812116b | 550 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
551 | ip_cmsg_recv(msg, skb); |
552 | } | |
553 | ||
554 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); | |
555 | ||
556 | /* Now we could try to dump offended packet options */ | |
557 | ||
558 | msg->msg_flags |= MSG_ERRQUEUE; | |
559 | err = copied; | |
560 | ||
960a2628 | 561 | consume_skb(skb); |
1da177e4 LT |
562 | out: |
563 | return err; | |
564 | } | |
565 | ||
6ebf71ba CH |
566 | static void __ip_sock_set_tos(struct sock *sk, int val) |
567 | { | |
568 | if (sk->sk_type == SOCK_STREAM) { | |
569 | val &= ~INET_ECN_MASK; | |
570 | val |= inet_sk(sk)->tos & INET_ECN_MASK; | |
571 | } | |
572 | if (inet_sk(sk)->tos != val) { | |
573 | inet_sk(sk)->tos = val; | |
574 | sk->sk_priority = rt_tos2priority(val); | |
575 | sk_dst_reset(sk); | |
576 | } | |
577 | } | |
578 | ||
579 | void ip_sock_set_tos(struct sock *sk, int val) | |
580 | { | |
581 | lock_sock(sk); | |
582 | __ip_sock_set_tos(sk, val); | |
583 | release_sock(sk); | |
584 | } | |
585 | EXPORT_SYMBOL(ip_sock_set_tos); | |
1da177e4 | 586 | |
c4e446bf CH |
587 | void ip_sock_set_freebind(struct sock *sk) |
588 | { | |
589 | lock_sock(sk); | |
590 | inet_sk(sk)->freebind = true; | |
591 | release_sock(sk); | |
592 | } | |
593 | EXPORT_SYMBOL(ip_sock_set_freebind); | |
594 | ||
db45c0ef CH |
595 | void ip_sock_set_recverr(struct sock *sk) |
596 | { | |
597 | lock_sock(sk); | |
598 | inet_sk(sk)->recverr = true; | |
599 | release_sock(sk); | |
600 | } | |
601 | EXPORT_SYMBOL(ip_sock_set_recverr); | |
602 | ||
2de569bd CH |
603 | int ip_sock_set_mtu_discover(struct sock *sk, int val) |
604 | { | |
605 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) | |
606 | return -EINVAL; | |
607 | lock_sock(sk); | |
608 | inet_sk(sk)->pmtudisc = val; | |
609 | release_sock(sk); | |
610 | return 0; | |
611 | } | |
612 | EXPORT_SYMBOL(ip_sock_set_mtu_discover); | |
613 | ||
c1f9ec57 CH |
614 | void ip_sock_set_pktinfo(struct sock *sk) |
615 | { | |
616 | lock_sock(sk); | |
617 | inet_sk(sk)->cmsg_flags |= IP_CMSG_PKTINFO; | |
618 | release_sock(sk); | |
619 | } | |
620 | EXPORT_SYMBOL(ip_sock_set_pktinfo); | |
621 | ||
1da177e4 | 622 | /* |
4d52cfbe ED |
623 | * Socket option code for IP. This is the end of the line after any |
624 | * TCP,UDP etc options on an IP socket. | |
1da177e4 | 625 | */ |
baf606d9 MRL |
626 | static bool setsockopt_needs_rtnl(int optname) |
627 | { | |
628 | switch (optname) { | |
629 | case IP_ADD_MEMBERSHIP: | |
630 | case IP_ADD_SOURCE_MEMBERSHIP: | |
54ff9ef3 | 631 | case IP_BLOCK_SOURCE: |
baf606d9 | 632 | case IP_DROP_MEMBERSHIP: |
54ff9ef3 MRL |
633 | case IP_DROP_SOURCE_MEMBERSHIP: |
634 | case IP_MSFILTER: | |
635 | case IP_UNBLOCK_SOURCE: | |
636 | case MCAST_BLOCK_SOURCE: | |
637 | case MCAST_MSFILTER: | |
baf606d9 | 638 | case MCAST_JOIN_GROUP: |
54ff9ef3 | 639 | case MCAST_JOIN_SOURCE_GROUP: |
baf606d9 | 640 | case MCAST_LEAVE_GROUP: |
54ff9ef3 MRL |
641 | case MCAST_LEAVE_SOURCE_GROUP: |
642 | case MCAST_UNBLOCK_SOURCE: | |
baf606d9 MRL |
643 | return true; |
644 | } | |
645 | return false; | |
646 | } | |
1da177e4 | 647 | |
e986d4da AV |
648 | static int set_mcast_msfilter(struct sock *sk, int ifindex, |
649 | int numsrc, int fmode, | |
650 | struct sockaddr_storage *group, | |
651 | struct sockaddr_storage *list) | |
652 | { | |
653 | int msize = IP_MSFILTER_SIZE(numsrc); | |
654 | struct ip_msfilter *msf; | |
655 | struct sockaddr_in *psin; | |
656 | int err, i; | |
657 | ||
658 | msf = kmalloc(msize, GFP_KERNEL); | |
659 | if (!msf) | |
660 | return -ENOBUFS; | |
661 | ||
662 | psin = (struct sockaddr_in *)group; | |
663 | if (psin->sin_family != AF_INET) | |
664 | goto Eaddrnotavail; | |
665 | msf->imsf_multiaddr = psin->sin_addr.s_addr; | |
666 | msf->imsf_interface = 0; | |
667 | msf->imsf_fmode = fmode; | |
668 | msf->imsf_numsrc = numsrc; | |
669 | for (i = 0; i < numsrc; ++i) { | |
670 | psin = (struct sockaddr_in *)&list[i]; | |
671 | ||
672 | if (psin->sin_family != AF_INET) | |
673 | goto Eaddrnotavail; | |
674 | msf->imsf_slist[i] = psin->sin_addr.s_addr; | |
675 | } | |
676 | err = ip_mc_msfilter(sk, msf, ifindex); | |
677 | kfree(msf); | |
678 | return err; | |
679 | ||
680 | Eaddrnotavail: | |
681 | kfree(msf); | |
682 | return -EADDRNOTAVAIL; | |
683 | } | |
684 | ||
b6238c04 CH |
685 | static int copy_group_source_from_user(struct group_source_req *greqs, |
686 | void __user *optval, int optlen) | |
687 | { | |
688 | if (in_compat_syscall()) { | |
689 | struct compat_group_source_req gr32; | |
690 | ||
691 | if (optlen != sizeof(gr32)) | |
692 | return -EINVAL; | |
693 | if (copy_from_user(&gr32, optval, sizeof(gr32))) | |
694 | return -EFAULT; | |
695 | greqs->gsr_interface = gr32.gsr_interface; | |
696 | greqs->gsr_group = gr32.gsr_group; | |
697 | greqs->gsr_source = gr32.gsr_source; | |
698 | } else { | |
699 | if (optlen != sizeof(*greqs)) | |
700 | return -EINVAL; | |
701 | if (copy_from_user(greqs, optval, sizeof(*greqs))) | |
702 | return -EFAULT; | |
703 | } | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
2bbf8c1e | 708 | static int do_mcast_group_source(struct sock *sk, int optname, |
b6238c04 | 709 | void __user *optval, int optlen) |
2bbf8c1e | 710 | { |
b6238c04 | 711 | struct group_source_req greqs; |
2bbf8c1e AV |
712 | struct ip_mreq_source mreqs; |
713 | struct sockaddr_in *psin; | |
714 | int omode, add, err; | |
715 | ||
b6238c04 CH |
716 | err = copy_group_source_from_user(&greqs, optval, optlen); |
717 | if (err) | |
718 | return err; | |
719 | ||
720 | if (greqs.gsr_group.ss_family != AF_INET || | |
721 | greqs.gsr_source.ss_family != AF_INET) | |
2bbf8c1e AV |
722 | return -EADDRNOTAVAIL; |
723 | ||
b6238c04 | 724 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
2bbf8c1e | 725 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; |
b6238c04 | 726 | psin = (struct sockaddr_in *)&greqs.gsr_source; |
2bbf8c1e AV |
727 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; |
728 | mreqs.imr_interface = 0; /* use index for mc_source */ | |
729 | ||
730 | if (optname == MCAST_BLOCK_SOURCE) { | |
731 | omode = MCAST_EXCLUDE; | |
732 | add = 1; | |
733 | } else if (optname == MCAST_UNBLOCK_SOURCE) { | |
734 | omode = MCAST_EXCLUDE; | |
735 | add = 0; | |
736 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { | |
737 | struct ip_mreqn mreq; | |
738 | ||
b6238c04 | 739 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
2bbf8c1e AV |
740 | mreq.imr_multiaddr = psin->sin_addr; |
741 | mreq.imr_address.s_addr = 0; | |
b6238c04 | 742 | mreq.imr_ifindex = greqs.gsr_interface; |
2bbf8c1e AV |
743 | err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); |
744 | if (err && err != -EADDRINUSE) | |
745 | return err; | |
b6238c04 | 746 | greqs.gsr_interface = mreq.imr_ifindex; |
2bbf8c1e AV |
747 | omode = MCAST_INCLUDE; |
748 | add = 1; | |
749 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { | |
750 | omode = MCAST_INCLUDE; | |
751 | add = 0; | |
752 | } | |
b6238c04 | 753 | return ip_mc_source(add, omode, sk, &mreqs, greqs.gsr_interface); |
2bbf8c1e AV |
754 | } |
755 | ||
d62c38f6 CH |
756 | static int ip_set_mcast_msfilter(struct sock *sk, void __user *optval, |
757 | int optlen) | |
758 | { | |
759 | struct group_filter *gsf = NULL; | |
760 | int err; | |
761 | ||
762 | if (optlen < GROUP_FILTER_SIZE(0)) | |
763 | return -EINVAL; | |
764 | if (optlen > sysctl_optmem_max) | |
765 | return -ENOBUFS; | |
766 | ||
767 | gsf = memdup_user(optval, optlen); | |
768 | if (IS_ERR(gsf)) | |
769 | return PTR_ERR(gsf); | |
770 | ||
771 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ | |
772 | err = -ENOBUFS; | |
773 | if (gsf->gf_numsrc >= 0x1ffffff || | |
774 | gsf->gf_numsrc > sock_net(sk)->ipv4.sysctl_igmp_max_msf) | |
775 | goto out_free_gsf; | |
776 | ||
777 | err = -EINVAL; | |
778 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) | |
779 | goto out_free_gsf; | |
780 | ||
781 | err = set_mcast_msfilter(sk, gsf->gf_interface, gsf->gf_numsrc, | |
782 | gsf->gf_fmode, &gsf->gf_group, gsf->gf_slist); | |
783 | out_free_gsf: | |
784 | kfree(gsf); | |
785 | return err; | |
786 | } | |
787 | ||
d62c38f6 CH |
788 | static int compat_ip_set_mcast_msfilter(struct sock *sk, void __user *optval, |
789 | int optlen) | |
790 | { | |
791 | const int size0 = offsetof(struct compat_group_filter, gf_slist); | |
792 | struct compat_group_filter *gf32; | |
793 | unsigned int n; | |
794 | void *p; | |
795 | int err; | |
796 | ||
797 | if (optlen < size0) | |
798 | return -EINVAL; | |
799 | if (optlen > sysctl_optmem_max - 4) | |
800 | return -ENOBUFS; | |
801 | ||
802 | p = kmalloc(optlen + 4, GFP_KERNEL); | |
803 | if (!p) | |
804 | return -ENOMEM; | |
805 | gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */ | |
806 | ||
807 | err = -EFAULT; | |
808 | if (copy_from_user(gf32, optval, optlen)) | |
809 | goto out_free_gsf; | |
810 | ||
811 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ | |
812 | n = gf32->gf_numsrc; | |
813 | err = -ENOBUFS; | |
814 | if (n >= 0x1ffffff) | |
815 | goto out_free_gsf; | |
816 | ||
817 | err = -EINVAL; | |
818 | if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) | |
819 | goto out_free_gsf; | |
820 | ||
d62c38f6 CH |
821 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
822 | err = -ENOBUFS; | |
823 | if (n > sock_net(sk)->ipv4.sysctl_igmp_max_msf) | |
b6238c04 | 824 | goto out_free_gsf; |
d62c38f6 CH |
825 | err = set_mcast_msfilter(sk, gf32->gf_interface, n, gf32->gf_fmode, |
826 | &gf32->gf_group, gf32->gf_slist); | |
d62c38f6 CH |
827 | out_free_gsf: |
828 | kfree(p); | |
829 | return err; | |
830 | } | |
d62c38f6 | 831 | |
02caad7c CH |
832 | static int ip_mcast_join_leave(struct sock *sk, int optname, |
833 | void __user *optval, int optlen) | |
834 | { | |
835 | struct ip_mreqn mreq = { }; | |
836 | struct sockaddr_in *psin; | |
837 | struct group_req greq; | |
838 | ||
839 | if (optlen < sizeof(struct group_req)) | |
840 | return -EINVAL; | |
841 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
842 | return -EFAULT; | |
843 | ||
844 | psin = (struct sockaddr_in *)&greq.gr_group; | |
845 | if (psin->sin_family != AF_INET) | |
846 | return -EINVAL; | |
847 | mreq.imr_multiaddr = psin->sin_addr; | |
848 | mreq.imr_ifindex = greq.gr_interface; | |
849 | if (optname == MCAST_JOIN_GROUP) | |
850 | return ip_mc_join_group(sk, &mreq); | |
851 | return ip_mc_leave_group(sk, &mreq); | |
852 | } | |
853 | ||
02caad7c CH |
854 | static int compat_ip_mcast_join_leave(struct sock *sk, int optname, |
855 | void __user *optval, int optlen) | |
856 | { | |
857 | struct compat_group_req greq; | |
858 | struct ip_mreqn mreq = { }; | |
859 | struct sockaddr_in *psin; | |
02caad7c CH |
860 | |
861 | if (optlen < sizeof(struct compat_group_req)) | |
862 | return -EINVAL; | |
863 | if (copy_from_user(&greq, optval, sizeof(greq))) | |
864 | return -EFAULT; | |
865 | ||
866 | psin = (struct sockaddr_in *)&greq.gr_group; | |
867 | if (psin->sin_family != AF_INET) | |
868 | return -EINVAL; | |
869 | mreq.imr_multiaddr = psin->sin_addr; | |
870 | mreq.imr_ifindex = greq.gr_interface; | |
871 | ||
02caad7c | 872 | if (optname == MCAST_JOIN_GROUP) |
b6238c04 CH |
873 | return ip_mc_join_group(sk, &mreq); |
874 | return ip_mc_leave_group(sk, &mreq); | |
02caad7c | 875 | } |
02caad7c | 876 | |
3fdadf7d | 877 | static int do_ip_setsockopt(struct sock *sk, int level, |
b7058842 | 878 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
879 | { |
880 | struct inet_sock *inet = inet_sk(sk); | |
166b6b2d | 881 | struct net *net = sock_net(sk); |
09cb105e | 882 | int val = 0, err; |
baf606d9 | 883 | bool needs_rtnl = setsockopt_needs_rtnl(optname); |
1da177e4 | 884 | |
0c9f79be XW |
885 | switch (optname) { |
886 | case IP_PKTINFO: | |
887 | case IP_RECVTTL: | |
888 | case IP_RECVOPTS: | |
889 | case IP_RECVTOS: | |
890 | case IP_RETOPTS: | |
891 | case IP_TOS: | |
892 | case IP_TTL: | |
893 | case IP_HDRINCL: | |
894 | case IP_MTU_DISCOVER: | |
895 | case IP_RECVERR: | |
896 | case IP_ROUTER_ALERT: | |
897 | case IP_FREEBIND: | |
898 | case IP_PASSSEC: | |
899 | case IP_TRANSPARENT: | |
900 | case IP_MINTTL: | |
901 | case IP_NODEFRAG: | |
90c337da | 902 | case IP_BIND_ADDRESS_NO_PORT: |
0c9f79be XW |
903 | case IP_UNICAST_IF: |
904 | case IP_MULTICAST_TTL: | |
905 | case IP_MULTICAST_ALL: | |
906 | case IP_MULTICAST_LOOP: | |
907 | case IP_RECVORIGDSTADDR: | |
ad6f939a | 908 | case IP_CHECKSUM: |
70ecc248 | 909 | case IP_RECVFRAGSIZE: |
eba75c58 | 910 | case IP_RECVERR_RFC4884: |
1da177e4 LT |
911 | if (optlen >= sizeof(int)) { |
912 | if (get_user(val, (int __user *) optval)) | |
913 | return -EFAULT; | |
914 | } else if (optlen >= sizeof(char)) { | |
915 | unsigned char ucval; | |
916 | ||
917 | if (get_user(ucval, (unsigned char __user *) optval)) | |
918 | return -EFAULT; | |
919 | val = (int) ucval; | |
920 | } | |
921 | } | |
922 | ||
923 | /* If optlen==0, it is equivalent to val == 0 */ | |
924 | ||
0526947f KT |
925 | if (optname == IP_ROUTER_ALERT) |
926 | return ip_ra_control(sk, val ? 1 : 0, NULL); | |
6a9fb947 | 927 | if (ip_mroute_opt(optname)) |
09cb105e | 928 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
1da177e4 LT |
929 | |
930 | err = 0; | |
baf606d9 MRL |
931 | if (needs_rtnl) |
932 | rtnl_lock(); | |
1da177e4 LT |
933 | lock_sock(sk); |
934 | ||
935 | switch (optname) { | |
132adf54 SH |
936 | case IP_OPTIONS: |
937 | { | |
f6d8bd05 ED |
938 | struct ip_options_rcu *old, *opt = NULL; |
939 | ||
65a1c4ff | 940 | if (optlen > 40) |
132adf54 | 941 | goto e_inval; |
3b1e0a65 | 942 | err = ip_options_get_from_user(sock_net(sk), &opt, |
cb84663e | 943 | optval, optlen); |
132adf54 SH |
944 | if (err) |
945 | break; | |
f6d8bd05 | 946 | old = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 947 | lockdep_sock_is_held(sk)); |
132adf54 SH |
948 | if (inet->is_icsk) { |
949 | struct inet_connection_sock *icsk = inet_csk(sk); | |
dfd56b8b | 950 | #if IS_ENABLED(CONFIG_IPV6) |
132adf54 SH |
951 | if (sk->sk_family == PF_INET || |
952 | (!((1 << sk->sk_state) & | |
953 | (TCPF_LISTEN | TCPF_CLOSE)) && | |
c720c7e8 | 954 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
1da177e4 | 955 | #endif |
f6d8bd05 ED |
956 | if (old) |
957 | icsk->icsk_ext_hdr_len -= old->opt.optlen; | |
132adf54 | 958 | if (opt) |
f6d8bd05 | 959 | icsk->icsk_ext_hdr_len += opt->opt.optlen; |
132adf54 | 960 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
dfd56b8b | 961 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 962 | } |
132adf54 | 963 | #endif |
1da177e4 | 964 | } |
f6d8bd05 ED |
965 | rcu_assign_pointer(inet->inet_opt, opt); |
966 | if (old) | |
605b4afe | 967 | kfree_rcu(old, rcu); |
132adf54 SH |
968 | break; |
969 | } | |
970 | case IP_PKTINFO: | |
971 | if (val) | |
972 | inet->cmsg_flags |= IP_CMSG_PKTINFO; | |
973 | else | |
974 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; | |
975 | break; | |
976 | case IP_RECVTTL: | |
977 | if (val) | |
978 | inet->cmsg_flags |= IP_CMSG_TTL; | |
979 | else | |
980 | inet->cmsg_flags &= ~IP_CMSG_TTL; | |
981 | break; | |
982 | case IP_RECVTOS: | |
983 | if (val) | |
984 | inet->cmsg_flags |= IP_CMSG_TOS; | |
985 | else | |
986 | inet->cmsg_flags &= ~IP_CMSG_TOS; | |
987 | break; | |
988 | case IP_RECVOPTS: | |
989 | if (val) | |
990 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; | |
991 | else | |
992 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; | |
993 | break; | |
994 | case IP_RETOPTS: | |
995 | if (val) | |
996 | inet->cmsg_flags |= IP_CMSG_RETOPTS; | |
997 | else | |
998 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; | |
999 | break; | |
1000 | case IP_PASSSEC: | |
1001 | if (val) | |
1002 | inet->cmsg_flags |= IP_CMSG_PASSSEC; | |
1003 | else | |
1004 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; | |
1005 | break; | |
e8b2dfe9 BS |
1006 | case IP_RECVORIGDSTADDR: |
1007 | if (val) | |
1008 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; | |
1009 | else | |
1010 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; | |
1011 | break; | |
ad6f939a TH |
1012 | case IP_CHECKSUM: |
1013 | if (val) { | |
1014 | if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { | |
1015 | inet_inc_convert_csum(sk); | |
1016 | inet->cmsg_flags |= IP_CMSG_CHECKSUM; | |
1017 | } | |
1018 | } else { | |
1019 | if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { | |
1020 | inet_dec_convert_csum(sk); | |
1021 | inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; | |
1022 | } | |
1023 | } | |
1024 | break; | |
70ecc248 WB |
1025 | case IP_RECVFRAGSIZE: |
1026 | if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) | |
1027 | goto e_inval; | |
1028 | if (val) | |
1029 | inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; | |
1030 | else | |
1031 | inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; | |
1032 | break; | |
132adf54 | 1033 | case IP_TOS: /* This sets both TOS and Precedence */ |
6ebf71ba | 1034 | __ip_sock_set_tos(sk, val); |
132adf54 SH |
1035 | break; |
1036 | case IP_TTL: | |
4d52cfbe | 1037 | if (optlen < 1) |
132adf54 | 1038 | goto e_inval; |
c9be4a5c | 1039 | if (val != -1 && (val < 1 || val > 255)) |
132adf54 SH |
1040 | goto e_inval; |
1041 | inet->uc_ttl = val; | |
1042 | break; | |
1043 | case IP_HDRINCL: | |
1044 | if (sk->sk_type != SOCK_RAW) { | |
1045 | err = -ENOPROTOOPT; | |
2c7946a7 | 1046 | break; |
132adf54 SH |
1047 | } |
1048 | inet->hdrincl = val ? 1 : 0; | |
1049 | break; | |
7b2ff18e JO |
1050 | case IP_NODEFRAG: |
1051 | if (sk->sk_type != SOCK_RAW) { | |
1052 | err = -ENOPROTOOPT; | |
1053 | break; | |
1054 | } | |
1055 | inet->nodefrag = val ? 1 : 0; | |
1056 | break; | |
90c337da ED |
1057 | case IP_BIND_ADDRESS_NO_PORT: |
1058 | inet->bind_address_no_port = val ? 1 : 0; | |
1059 | break; | |
132adf54 | 1060 | case IP_MTU_DISCOVER: |
1b346576 | 1061 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
132adf54 SH |
1062 | goto e_inval; |
1063 | inet->pmtudisc = val; | |
1064 | break; | |
1065 | case IP_RECVERR: | |
1066 | inet->recverr = !!val; | |
1067 | if (!val) | |
1068 | skb_queue_purge(&sk->sk_error_queue); | |
1069 | break; | |
eba75c58 WB |
1070 | case IP_RECVERR_RFC4884: |
1071 | if (val < 0 || val > 1) | |
1072 | goto e_inval; | |
1073 | inet->recverr_rfc4884 = !!val; | |
1074 | break; | |
132adf54 SH |
1075 | case IP_MULTICAST_TTL: |
1076 | if (sk->sk_type == SOCK_STREAM) | |
1077 | goto e_inval; | |
4d52cfbe | 1078 | if (optlen < 1) |
132adf54 | 1079 | goto e_inval; |
09cb105e | 1080 | if (val == -1) |
132adf54 SH |
1081 | val = 1; |
1082 | if (val < 0 || val > 255) | |
1083 | goto e_inval; | |
1084 | inet->mc_ttl = val; | |
1085 | break; | |
1086 | case IP_MULTICAST_LOOP: | |
4d52cfbe | 1087 | if (optlen < 1) |
132adf54 SH |
1088 | goto e_inval; |
1089 | inet->mc_loop = !!val; | |
1090 | break; | |
76e21053 EH |
1091 | case IP_UNICAST_IF: |
1092 | { | |
1093 | struct net_device *dev = NULL; | |
1094 | int ifindex; | |
9515a2e0 | 1095 | int midx; |
76e21053 EH |
1096 | |
1097 | if (optlen != sizeof(int)) | |
1098 | goto e_inval; | |
1099 | ||
1100 | ifindex = (__force int)ntohl((__force __be32)val); | |
1101 | if (ifindex == 0) { | |
1102 | inet->uc_index = 0; | |
1103 | err = 0; | |
1104 | break; | |
1105 | } | |
1106 | ||
1107 | dev = dev_get_by_index(sock_net(sk), ifindex); | |
1108 | err = -EADDRNOTAVAIL; | |
1109 | if (!dev) | |
1110 | break; | |
9515a2e0 DA |
1111 | |
1112 | midx = l3mdev_master_ifindex(dev); | |
76e21053 EH |
1113 | dev_put(dev); |
1114 | ||
1115 | err = -EINVAL; | |
9515a2e0 DA |
1116 | if (sk->sk_bound_dev_if && |
1117 | (!midx || midx != sk->sk_bound_dev_if)) | |
76e21053 EH |
1118 | break; |
1119 | ||
1120 | inet->uc_index = ifindex; | |
1121 | err = 0; | |
1122 | break; | |
1123 | } | |
132adf54 SH |
1124 | case IP_MULTICAST_IF: |
1125 | { | |
1126 | struct ip_mreqn mreq; | |
1127 | struct net_device *dev = NULL; | |
7bb387c5 | 1128 | int midx; |
132adf54 SH |
1129 | |
1130 | if (sk->sk_type == SOCK_STREAM) | |
1131 | goto e_inval; | |
1132 | /* | |
1133 | * Check the arguments are allowable | |
1134 | */ | |
1135 | ||
0915921b SW |
1136 | if (optlen < sizeof(struct in_addr)) |
1137 | goto e_inval; | |
1138 | ||
132adf54 SH |
1139 | err = -EFAULT; |
1140 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 1141 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 1142 | break; |
132adf54 SH |
1143 | } else { |
1144 | memset(&mreq, 0, sizeof(mreq)); | |
3a084ddb JP |
1145 | if (optlen >= sizeof(struct ip_mreq)) { |
1146 | if (copy_from_user(&mreq, optval, | |
1147 | sizeof(struct ip_mreq))) | |
1148 | break; | |
1149 | } else if (optlen >= sizeof(struct in_addr)) { | |
1150 | if (copy_from_user(&mreq.imr_address, optval, | |
1151 | sizeof(struct in_addr))) | |
1152 | break; | |
1153 | } | |
132adf54 SH |
1154 | } |
1155 | ||
1156 | if (!mreq.imr_ifindex) { | |
e6f1cebf | 1157 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
132adf54 SH |
1158 | inet->mc_index = 0; |
1159 | inet->mc_addr = 0; | |
1160 | err = 0; | |
1da177e4 LT |
1161 | break; |
1162 | } | |
3b1e0a65 | 1163 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
55b80503 | 1164 | if (dev) |
132adf54 | 1165 | mreq.imr_ifindex = dev->ifindex; |
132adf54 | 1166 | } else |
55b80503 | 1167 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
1da177e4 | 1168 | |
1da177e4 | 1169 | |
132adf54 SH |
1170 | err = -EADDRNOTAVAIL; |
1171 | if (!dev) | |
1172 | break; | |
7bb387c5 DA |
1173 | |
1174 | midx = l3mdev_master_ifindex(dev); | |
1175 | ||
55b80503 | 1176 | dev_put(dev); |
132adf54 SH |
1177 | |
1178 | err = -EINVAL; | |
1179 | if (sk->sk_bound_dev_if && | |
7bb387c5 DA |
1180 | mreq.imr_ifindex != sk->sk_bound_dev_if && |
1181 | (!midx || midx != sk->sk_bound_dev_if)) | |
132adf54 | 1182 | break; |
1da177e4 | 1183 | |
132adf54 SH |
1184 | inet->mc_index = mreq.imr_ifindex; |
1185 | inet->mc_addr = mreq.imr_address.s_addr; | |
1186 | err = 0; | |
1187 | break; | |
1188 | } | |
1da177e4 | 1189 | |
132adf54 SH |
1190 | case IP_ADD_MEMBERSHIP: |
1191 | case IP_DROP_MEMBERSHIP: | |
1192 | { | |
1193 | struct ip_mreqn mreq; | |
1da177e4 | 1194 | |
a96fb49b FL |
1195 | err = -EPROTO; |
1196 | if (inet_sk(sk)->is_icsk) | |
1197 | break; | |
1198 | ||
132adf54 SH |
1199 | if (optlen < sizeof(struct ip_mreq)) |
1200 | goto e_inval; | |
1201 | err = -EFAULT; | |
1202 | if (optlen >= sizeof(struct ip_mreqn)) { | |
09cb105e | 1203 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
1da177e4 | 1204 | break; |
132adf54 SH |
1205 | } else { |
1206 | memset(&mreq, 0, sizeof(mreq)); | |
09cb105e | 1207 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
1da177e4 | 1208 | break; |
132adf54 | 1209 | } |
1da177e4 | 1210 | |
132adf54 | 1211 | if (optname == IP_ADD_MEMBERSHIP) |
54ff9ef3 | 1212 | err = ip_mc_join_group(sk, &mreq); |
132adf54 | 1213 | else |
54ff9ef3 | 1214 | err = ip_mc_leave_group(sk, &mreq); |
132adf54 SH |
1215 | break; |
1216 | } | |
1217 | case IP_MSFILTER: | |
1218 | { | |
132adf54 SH |
1219 | struct ip_msfilter *msf; |
1220 | ||
1221 | if (optlen < IP_MSFILTER_SIZE(0)) | |
1222 | goto e_inval; | |
1223 | if (optlen > sysctl_optmem_max) { | |
1224 | err = -ENOBUFS; | |
1da177e4 LT |
1225 | break; |
1226 | } | |
a2c841d9 AV |
1227 | msf = memdup_user(optval, optlen); |
1228 | if (IS_ERR(msf)) { | |
1229 | err = PTR_ERR(msf); | |
132adf54 SH |
1230 | break; |
1231 | } | |
1232 | /* numsrc >= (1G-4) overflow in 32 bits */ | |
1233 | if (msf->imsf_numsrc >= 0x3ffffffcU || | |
166b6b2d | 1234 | msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
132adf54 SH |
1235 | kfree(msf); |
1236 | err = -ENOBUFS; | |
1237 | break; | |
1238 | } | |
1239 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { | |
1240 | kfree(msf); | |
1241 | err = -EINVAL; | |
1242 | break; | |
1243 | } | |
1244 | err = ip_mc_msfilter(sk, msf, 0); | |
1245 | kfree(msf); | |
1246 | break; | |
1247 | } | |
1248 | case IP_BLOCK_SOURCE: | |
1249 | case IP_UNBLOCK_SOURCE: | |
1250 | case IP_ADD_SOURCE_MEMBERSHIP: | |
1251 | case IP_DROP_SOURCE_MEMBERSHIP: | |
1252 | { | |
1253 | struct ip_mreq_source mreqs; | |
1254 | int omode, add; | |
1da177e4 | 1255 | |
132adf54 SH |
1256 | if (optlen != sizeof(struct ip_mreq_source)) |
1257 | goto e_inval; | |
1258 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { | |
1da177e4 | 1259 | err = -EFAULT; |
1da177e4 LT |
1260 | break; |
1261 | } | |
132adf54 SH |
1262 | if (optname == IP_BLOCK_SOURCE) { |
1263 | omode = MCAST_EXCLUDE; | |
1264 | add = 1; | |
1265 | } else if (optname == IP_UNBLOCK_SOURCE) { | |
1266 | omode = MCAST_EXCLUDE; | |
1267 | add = 0; | |
1268 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { | |
1269 | struct ip_mreqn mreq; | |
1da177e4 | 1270 | |
132adf54 SH |
1271 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
1272 | mreq.imr_address.s_addr = mreqs.imr_interface; | |
1273 | mreq.imr_ifindex = 0; | |
6e2059b5 | 1274 | err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); |
132adf54 | 1275 | if (err && err != -EADDRINUSE) |
1da177e4 | 1276 | break; |
132adf54 SH |
1277 | omode = MCAST_INCLUDE; |
1278 | add = 1; | |
1279 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { | |
1280 | omode = MCAST_INCLUDE; | |
1281 | add = 0; | |
1282 | } | |
1283 | err = ip_mc_source(add, omode, sk, &mreqs, 0); | |
1284 | break; | |
1285 | } | |
1286 | case MCAST_JOIN_GROUP: | |
1287 | case MCAST_LEAVE_GROUP: | |
b6238c04 CH |
1288 | if (in_compat_syscall()) |
1289 | err = compat_ip_mcast_join_leave(sk, optname, optval, | |
1290 | optlen); | |
1291 | else | |
1292 | err = ip_mcast_join_leave(sk, optname, optval, optlen); | |
132adf54 | 1293 | break; |
132adf54 SH |
1294 | case MCAST_JOIN_SOURCE_GROUP: |
1295 | case MCAST_LEAVE_SOURCE_GROUP: | |
1296 | case MCAST_BLOCK_SOURCE: | |
1297 | case MCAST_UNBLOCK_SOURCE: | |
b6238c04 | 1298 | err = do_mcast_group_source(sk, optname, optval, optlen); |
132adf54 | 1299 | break; |
132adf54 | 1300 | case MCAST_MSFILTER: |
b6238c04 CH |
1301 | if (in_compat_syscall()) |
1302 | err = compat_ip_set_mcast_msfilter(sk, optval, optlen); | |
1303 | else | |
1304 | err = ip_set_mcast_msfilter(sk, optval, optlen); | |
132adf54 | 1305 | break; |
f771bef9 NS |
1306 | case IP_MULTICAST_ALL: |
1307 | if (optlen < 1) | |
1308 | goto e_inval; | |
1309 | if (val != 0 && val != 1) | |
1310 | goto e_inval; | |
1311 | inet->mc_all = val; | |
1312 | break; | |
132adf54 SH |
1313 | |
1314 | case IP_FREEBIND: | |
4d52cfbe | 1315 | if (optlen < 1) |
132adf54 SH |
1316 | goto e_inval; |
1317 | inet->freebind = !!val; | |
1318 | break; | |
1319 | ||
1320 | case IP_IPSEC_POLICY: | |
1321 | case IP_XFRM_POLICY: | |
1322 | err = -EPERM; | |
52e804c6 | 1323 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1324 | break; |
132adf54 SH |
1325 | err = xfrm_user_policy(sk, optname, optval, optlen); |
1326 | break; | |
1da177e4 | 1327 | |
f5715aea | 1328 | case IP_TRANSPARENT: |
52e804c6 EB |
1329 | if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
1330 | !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
f5715aea KK |
1331 | err = -EPERM; |
1332 | break; | |
1333 | } | |
1334 | if (optlen < 1) | |
1335 | goto e_inval; | |
1336 | inet->transparent = !!val; | |
1337 | break; | |
1338 | ||
d218d111 SH |
1339 | case IP_MINTTL: |
1340 | if (optlen < 1) | |
1341 | goto e_inval; | |
1342 | if (val < 0 || val > 255) | |
1343 | goto e_inval; | |
1344 | inet->min_ttl = val; | |
1345 | break; | |
1346 | ||
132adf54 SH |
1347 | default: |
1348 | err = -ENOPROTOOPT; | |
1349 | break; | |
1da177e4 LT |
1350 | } |
1351 | release_sock(sk); | |
baf606d9 MRL |
1352 | if (needs_rtnl) |
1353 | rtnl_unlock(); | |
1da177e4 LT |
1354 | return err; |
1355 | ||
1356 | e_inval: | |
1357 | release_sock(sk); | |
baf606d9 MRL |
1358 | if (needs_rtnl) |
1359 | rtnl_unlock(); | |
1da177e4 LT |
1360 | return -EINVAL; |
1361 | } | |
1362 | ||
f84af32c | 1363 | /** |
829ae9d6 | 1364 | * ipv4_pktinfo_prepare - transfer some info from rtable to skb |
f84af32c ED |
1365 | * @sk: socket |
1366 | * @skb: buffer | |
1367 | * | |
35ebf65e DM |
1368 | * To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
1369 | * destination in skb->cb[] before dst drop. | |
8e3bff96 | 1370 | * This way, receiver doesn't make cache line misses to read rtable. |
f84af32c | 1371 | */ |
fbf8866d | 1372 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
f84af32c | 1373 | { |
d826eb14 | 1374 | struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
4b261c75 HFS |
1375 | bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
1376 | ipv6_sk_rxinfo(sk); | |
d826eb14 | 1377 | |
4b261c75 | 1378 | if (prepare && skb_rtable(skb)) { |
0b922b7a DA |
1379 | /* skb->cb is overloaded: prior to this point it is IP{6}CB |
1380 | * which has interface index (iif) as the first member of the | |
1381 | * underlying inet{6}_skb_parm struct. This code then overlays | |
1382 | * PKTINFO_SKB_CB and in_pktinfo also has iif as the first | |
f0c16ba8 WZ |
1383 | * element so the iif is picked up from the prior IPCB. If iif |
1384 | * is the loopback interface, then return the sending interface | |
1385 | * (e.g., process binds socket to eth0 for Tx which is | |
1386 | * redirected to loopback in the rtable/dst). | |
0b922b7a | 1387 | */ |
cbea8f02 DA |
1388 | struct rtable *rt = skb_rtable(skb); |
1389 | bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); | |
1390 | ||
1391 | if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) | |
f0c16ba8 | 1392 | pktinfo->ipi_ifindex = inet_iif(skb); |
cbea8f02 DA |
1393 | else if (l3slave && rt && rt->rt_iif) |
1394 | pktinfo->ipi_ifindex = rt->rt_iif; | |
f0c16ba8 | 1395 | |
35ebf65e | 1396 | pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
d826eb14 ED |
1397 | } else { |
1398 | pktinfo->ipi_ifindex = 0; | |
1399 | pktinfo->ipi_spec_dst.s_addr = 0; | |
1400 | } | |
61a1030b | 1401 | skb_dst_drop(skb); |
f84af32c | 1402 | } |
f84af32c | 1403 | |
3fdadf7d | 1404 | int ip_setsockopt(struct sock *sk, int level, |
b7058842 | 1405 | int optname, char __user *optval, unsigned int optlen) |
3fdadf7d DM |
1406 | { |
1407 | int err; | |
1408 | ||
1409 | if (level != SOL_IP) | |
1410 | return -ENOPROTOOPT; | |
1411 | ||
1412 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); | |
97adadda | 1413 | #if IS_ENABLED(CONFIG_BPFILTER_UMH) |
d2ba09c1 AS |
1414 | if (optname >= BPFILTER_IPT_SO_SET_REPLACE && |
1415 | optname < BPFILTER_IPT_SET_MAX) | |
1416 | err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); | |
1417 | #endif | |
3fdadf7d DM |
1418 | #ifdef CONFIG_NETFILTER |
1419 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
1420 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && | |
6a9fb947 PE |
1421 | optname != IP_IPSEC_POLICY && |
1422 | optname != IP_XFRM_POLICY && | |
3f34cfae | 1423 | !ip_mroute_opt(optname)) |
3fdadf7d | 1424 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
3fdadf7d DM |
1425 | #endif |
1426 | return err; | |
1427 | } | |
4d52cfbe | 1428 | EXPORT_SYMBOL(ip_setsockopt); |
3fdadf7d | 1429 | |
1da177e4 | 1430 | /* |
4d52cfbe ED |
1431 | * Get the options. Note for future reference. The GET of IP options gets |
1432 | * the _received_ ones. The set sets the _sent_ ones. | |
1da177e4 LT |
1433 | */ |
1434 | ||
87e9f031 WC |
1435 | static bool getsockopt_needs_rtnl(int optname) |
1436 | { | |
1437 | switch (optname) { | |
1438 | case IP_MSFILTER: | |
1439 | case MCAST_MSFILTER: | |
1440 | return true; | |
1441 | } | |
1442 | return false; | |
1443 | } | |
1444 | ||
49e74c24 CH |
1445 | static int ip_get_mcast_msfilter(struct sock *sk, void __user *optval, |
1446 | int __user *optlen, int len) | |
1447 | { | |
1448 | const int size0 = offsetof(struct group_filter, gf_slist); | |
1449 | struct group_filter __user *p = optval; | |
1450 | struct group_filter gsf; | |
1451 | int num; | |
1452 | int err; | |
1453 | ||
1454 | if (len < size0) | |
1455 | return -EINVAL; | |
1456 | if (copy_from_user(&gsf, p, size0)) | |
1457 | return -EFAULT; | |
1458 | ||
1459 | num = gsf.gf_numsrc; | |
1460 | err = ip_mc_gsfget(sk, &gsf, p->gf_slist); | |
1461 | if (err) | |
1462 | return err; | |
1463 | if (gsf.gf_numsrc < num) | |
1464 | num = gsf.gf_numsrc; | |
1465 | if (put_user(GROUP_FILTER_SIZE(num), optlen) || | |
1466 | copy_to_user(p, &gsf, size0)) | |
1467 | return -EFAULT; | |
1468 | return 0; | |
1469 | } | |
1470 | ||
49e74c24 | 1471 | static int compat_ip_get_mcast_msfilter(struct sock *sk, void __user *optval, |
b6238c04 | 1472 | int __user *optlen, int len) |
49e74c24 CH |
1473 | { |
1474 | const int size0 = offsetof(struct compat_group_filter, gf_slist); | |
1475 | struct compat_group_filter __user *p = optval; | |
1476 | struct compat_group_filter gf32; | |
1477 | struct group_filter gf; | |
49e74c24 | 1478 | int num; |
b6238c04 | 1479 | int err; |
49e74c24 | 1480 | |
49e74c24 CH |
1481 | if (len < size0) |
1482 | return -EINVAL; | |
49e74c24 CH |
1483 | if (copy_from_user(&gf32, p, size0)) |
1484 | return -EFAULT; | |
1485 | ||
1486 | gf.gf_interface = gf32.gf_interface; | |
1487 | gf.gf_fmode = gf32.gf_fmode; | |
1488 | num = gf.gf_numsrc = gf32.gf_numsrc; | |
1489 | gf.gf_group = gf32.gf_group; | |
1490 | ||
49e74c24 | 1491 | err = ip_mc_gsfget(sk, &gf, p->gf_slist); |
49e74c24 CH |
1492 | if (err) |
1493 | return err; | |
1494 | if (gf.gf_numsrc < num) | |
1495 | num = gf.gf_numsrc; | |
1496 | len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32)); | |
1497 | if (put_user(len, optlen) || | |
1498 | put_user(gf.gf_fmode, &p->gf_fmode) || | |
1499 | put_user(gf.gf_numsrc, &p->gf_numsrc)) | |
1500 | return -EFAULT; | |
1501 | return 0; | |
1502 | } | |
49e74c24 | 1503 | |
3fdadf7d | 1504 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
b6238c04 | 1505 | char __user *optval, int __user *optlen) |
1da177e4 LT |
1506 | { |
1507 | struct inet_sock *inet = inet_sk(sk); | |
87e9f031 WC |
1508 | bool needs_rtnl = getsockopt_needs_rtnl(optname); |
1509 | int val, err = 0; | |
1da177e4 | 1510 | int len; |
e905a9ed | 1511 | |
132adf54 | 1512 | if (level != SOL_IP) |
1da177e4 LT |
1513 | return -EOPNOTSUPP; |
1514 | ||
6a9fb947 | 1515 | if (ip_mroute_opt(optname)) |
09cb105e | 1516 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
1da177e4 | 1517 | |
09cb105e | 1518 | if (get_user(len, optlen)) |
1da177e4 | 1519 | return -EFAULT; |
132adf54 | 1520 | if (len < 0) |
1da177e4 | 1521 | return -EINVAL; |
e905a9ed | 1522 | |
87e9f031 WC |
1523 | if (needs_rtnl) |
1524 | rtnl_lock(); | |
1da177e4 LT |
1525 | lock_sock(sk); |
1526 | ||
132adf54 SH |
1527 | switch (optname) { |
1528 | case IP_OPTIONS: | |
1529 | { | |
1530 | unsigned char optbuf[sizeof(struct ip_options)+40]; | |
f6d8bd05 ED |
1531 | struct ip_options *opt = (struct ip_options *)optbuf; |
1532 | struct ip_options_rcu *inet_opt; | |
1533 | ||
1534 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1e1d04e6 | 1535 | lockdep_sock_is_held(sk)); |
132adf54 | 1536 | opt->optlen = 0; |
f6d8bd05 ED |
1537 | if (inet_opt) |
1538 | memcpy(optbuf, &inet_opt->opt, | |
1539 | sizeof(struct ip_options) + | |
1540 | inet_opt->opt.optlen); | |
132adf54 SH |
1541 | release_sock(sk); |
1542 | ||
1543 | if (opt->optlen == 0) | |
1544 | return put_user(0, optlen); | |
1545 | ||
1546 | ip_options_undo(opt); | |
1547 | ||
1548 | len = min_t(unsigned int, len, opt->optlen); | |
1549 | if (put_user(len, optlen)) | |
1550 | return -EFAULT; | |
1551 | if (copy_to_user(optval, opt->__data, len)) | |
1552 | return -EFAULT; | |
1553 | return 0; | |
1554 | } | |
1555 | case IP_PKTINFO: | |
1556 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; | |
1557 | break; | |
1558 | case IP_RECVTTL: | |
1559 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; | |
1560 | break; | |
1561 | case IP_RECVTOS: | |
1562 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; | |
1563 | break; | |
1564 | case IP_RECVOPTS: | |
1565 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; | |
1566 | break; | |
1567 | case IP_RETOPTS: | |
1568 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; | |
1569 | break; | |
1570 | case IP_PASSSEC: | |
1571 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; | |
1572 | break; | |
e8b2dfe9 BS |
1573 | case IP_RECVORIGDSTADDR: |
1574 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; | |
1575 | break; | |
ad6f939a TH |
1576 | case IP_CHECKSUM: |
1577 | val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; | |
1578 | break; | |
70ecc248 WB |
1579 | case IP_RECVFRAGSIZE: |
1580 | val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; | |
1581 | break; | |
132adf54 SH |
1582 | case IP_TOS: |
1583 | val = inet->tos; | |
1584 | break; | |
1585 | case IP_TTL: | |
fa50d974 NB |
1586 | { |
1587 | struct net *net = sock_net(sk); | |
132adf54 | 1588 | val = (inet->uc_ttl == -1 ? |
fa50d974 | 1589 | net->ipv4.sysctl_ip_default_ttl : |
132adf54 SH |
1590 | inet->uc_ttl); |
1591 | break; | |
fa50d974 | 1592 | } |
132adf54 SH |
1593 | case IP_HDRINCL: |
1594 | val = inet->hdrincl; | |
1595 | break; | |
a89b4763 MK |
1596 | case IP_NODEFRAG: |
1597 | val = inet->nodefrag; | |
1598 | break; | |
90c337da ED |
1599 | case IP_BIND_ADDRESS_NO_PORT: |
1600 | val = inet->bind_address_no_port; | |
1601 | break; | |
132adf54 SH |
1602 | case IP_MTU_DISCOVER: |
1603 | val = inet->pmtudisc; | |
1604 | break; | |
1605 | case IP_MTU: | |
1606 | { | |
1607 | struct dst_entry *dst; | |
1608 | val = 0; | |
1609 | dst = sk_dst_get(sk); | |
1610 | if (dst) { | |
1611 | val = dst_mtu(dst); | |
1612 | dst_release(dst); | |
1da177e4 | 1613 | } |
132adf54 | 1614 | if (!val) { |
1da177e4 | 1615 | release_sock(sk); |
132adf54 | 1616 | return -ENOTCONN; |
1da177e4 | 1617 | } |
132adf54 SH |
1618 | break; |
1619 | } | |
1620 | case IP_RECVERR: | |
1621 | val = inet->recverr; | |
1622 | break; | |
eba75c58 WB |
1623 | case IP_RECVERR_RFC4884: |
1624 | val = inet->recverr_rfc4884; | |
1625 | break; | |
132adf54 SH |
1626 | case IP_MULTICAST_TTL: |
1627 | val = inet->mc_ttl; | |
1628 | break; | |
1629 | case IP_MULTICAST_LOOP: | |
1630 | val = inet->mc_loop; | |
1631 | break; | |
76e21053 EH |
1632 | case IP_UNICAST_IF: |
1633 | val = (__force int)htonl((__u32) inet->uc_index); | |
1634 | break; | |
132adf54 SH |
1635 | case IP_MULTICAST_IF: |
1636 | { | |
1637 | struct in_addr addr; | |
1638 | len = min_t(unsigned int, len, sizeof(struct in_addr)); | |
1639 | addr.s_addr = inet->mc_addr; | |
1640 | release_sock(sk); | |
1da177e4 | 1641 | |
132adf54 SH |
1642 | if (put_user(len, optlen)) |
1643 | return -EFAULT; | |
1644 | if (copy_to_user(optval, &addr, len)) | |
1645 | return -EFAULT; | |
1646 | return 0; | |
1647 | } | |
1648 | case IP_MSFILTER: | |
1649 | { | |
1650 | struct ip_msfilter msf; | |
132adf54 SH |
1651 | |
1652 | if (len < IP_MSFILTER_SIZE(0)) { | |
87e9f031 WC |
1653 | err = -EINVAL; |
1654 | goto out; | |
1da177e4 | 1655 | } |
132adf54 | 1656 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
87e9f031 WC |
1657 | err = -EFAULT; |
1658 | goto out; | |
1da177e4 | 1659 | } |
132adf54 SH |
1660 | err = ip_mc_msfget(sk, &msf, |
1661 | (struct ip_msfilter __user *)optval, optlen); | |
87e9f031 | 1662 | goto out; |
132adf54 SH |
1663 | } |
1664 | case MCAST_MSFILTER: | |
b6238c04 CH |
1665 | if (in_compat_syscall()) |
1666 | err = compat_ip_get_mcast_msfilter(sk, optval, optlen, | |
1667 | len); | |
1668 | else | |
1669 | err = ip_get_mcast_msfilter(sk, optval, optlen, len); | |
87e9f031 | 1670 | goto out; |
f771bef9 NS |
1671 | case IP_MULTICAST_ALL: |
1672 | val = inet->mc_all; | |
1673 | break; | |
132adf54 SH |
1674 | case IP_PKTOPTIONS: |
1675 | { | |
1676 | struct msghdr msg; | |
1da177e4 | 1677 | |
132adf54 | 1678 | release_sock(sk); |
1da177e4 | 1679 | |
132adf54 SH |
1680 | if (sk->sk_type != SOCK_STREAM) |
1681 | return -ENOPROTOOPT; | |
1da177e4 | 1682 | |
1f466e1f CH |
1683 | msg.msg_control_is_user = true; |
1684 | msg.msg_control_user = optval; | |
132adf54 | 1685 | msg.msg_controllen = len; |
b6238c04 | 1686 | msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0; |
1da177e4 | 1687 | |
132adf54 SH |
1688 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
1689 | struct in_pktinfo info; | |
1690 | ||
c720c7e8 ED |
1691 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
1692 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; | |
132adf54 SH |
1693 | info.ipi_ifindex = inet->mc_index; |
1694 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); | |
1da177e4 | 1695 | } |
132adf54 SH |
1696 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
1697 | int hlim = inet->mc_ttl; | |
1698 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); | |
1699 | } | |
4c507d28 JB |
1700 | if (inet->cmsg_flags & IP_CMSG_TOS) { |
1701 | int tos = inet->rcv_tos; | |
1702 | put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); | |
1703 | } | |
132adf54 SH |
1704 | len -= msg.msg_controllen; |
1705 | return put_user(len, optlen); | |
1706 | } | |
1707 | case IP_FREEBIND: | |
1708 | val = inet->freebind; | |
1709 | break; | |
f5715aea KK |
1710 | case IP_TRANSPARENT: |
1711 | val = inet->transparent; | |
1712 | break; | |
d218d111 SH |
1713 | case IP_MINTTL: |
1714 | val = inet->min_ttl; | |
1715 | break; | |
132adf54 SH |
1716 | default: |
1717 | release_sock(sk); | |
1718 | return -ENOPROTOOPT; | |
1da177e4 LT |
1719 | } |
1720 | release_sock(sk); | |
e905a9ed | 1721 | |
4d52cfbe | 1722 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
1da177e4 LT |
1723 | unsigned char ucval = (unsigned char)val; |
1724 | len = 1; | |
132adf54 | 1725 | if (put_user(len, optlen)) |
1da177e4 | 1726 | return -EFAULT; |
09cb105e | 1727 | if (copy_to_user(optval, &ucval, 1)) |
1da177e4 LT |
1728 | return -EFAULT; |
1729 | } else { | |
1730 | len = min_t(unsigned int, sizeof(int), len); | |
132adf54 | 1731 | if (put_user(len, optlen)) |
1da177e4 | 1732 | return -EFAULT; |
09cb105e | 1733 | if (copy_to_user(optval, &val, len)) |
1da177e4 LT |
1734 | return -EFAULT; |
1735 | } | |
1736 | return 0; | |
87e9f031 WC |
1737 | |
1738 | out: | |
1739 | release_sock(sk); | |
1740 | if (needs_rtnl) | |
1741 | rtnl_unlock(); | |
1742 | return err; | |
1da177e4 LT |
1743 | } |
1744 | ||
3fdadf7d | 1745 | int ip_getsockopt(struct sock *sk, int level, |
132adf54 | 1746 | int optname, char __user *optval, int __user *optlen) |
3fdadf7d DM |
1747 | { |
1748 | int err; | |
1749 | ||
b6238c04 | 1750 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); |
42908c69 | 1751 | |
97adadda | 1752 | #if IS_ENABLED(CONFIG_BPFILTER_UMH) |
d2ba09c1 AS |
1753 | if (optname >= BPFILTER_IPT_SO_GET_INFO && |
1754 | optname < BPFILTER_IPT_GET_MAX) | |
1755 | err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); | |
1756 | #endif | |
3fdadf7d DM |
1757 | #ifdef CONFIG_NETFILTER |
1758 | /* we need to exclude all possible ENOPROTOOPTs except default case */ | |
6a9fb947 PE |
1759 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
1760 | !ip_mroute_opt(optname)) { | |
e905a9ed | 1761 | int len; |
3fdadf7d | 1762 | |
543d9cfe | 1763 | if (get_user(len, optlen)) |
3fdadf7d DM |
1764 | return -EFAULT; |
1765 | ||
77d4df41 | 1766 | err = nf_getsockopt(sk, PF_INET, optname, optval, &len); |
3fdadf7d DM |
1767 | if (err >= 0) |
1768 | err = put_user(len, optlen); | |
1769 | return err; | |
1770 | } | |
1771 | #endif | |
1772 | return err; | |
1773 | } | |
b6238c04 | 1774 | EXPORT_SYMBOL(ip_getsockopt); |