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1da177e4 1/*
73c1f4a0 2 * inet_diag.c Module for monitoring INET transport protocols sockets.
1da177e4 3 *
1da177e4
LT		 4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
172589cc 12#include <linux/kernel.h>
1da177e4
LT		 13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/fcntl.h>
16#include <linux/random.h>
5a0e3ad6 17#include <linux/slab.h>
1da177e4
LT		 18#include <linux/cache.h>
19#include <linux/init.h>
20#include <linux/time.h>
21
22#include <net/icmp.h>
23#include <net/tcp.h>
24#include <net/ipv6.h>
25#include <net/inet_common.h>
505cbfc5
ACM		 26#include <net/inet_connection_sock.h>
27#include <net/inet_hashtables.h>
28#include <net/inet_timewait_sock.h>
29#include <net/inet6_hashtables.h>
dc5fc579 30#include <net/netlink.h>
1da177e4
LT		 31
32#include <linux/inet.h>
33#include <linux/stddef.h>
34
a8c2190e 35#include <linux/inet_diag.h>
d366477a 36#include <linux/sock_diag.h>
1da177e4 37
4f5736c4
ACM		 38static const struct inet_diag_handler **inet_diag_table;
39
73c1f4a0 40struct inet_diag_entry {
e31c5e0e
ED		 41 const __be32 *saddr;
42 const __be32 *daddr;
1da177e4
LT		 43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
637c841d 47 u32 ifindex;
a52e95ab 48 u32 mark;
1da177e4
LT		 49};
50
d523a328
HX		 51static DEFINE_MUTEX(inet_diag_table_mutex);
52
f13c95f0 53static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
d523a328 54{
f13c95f0 55 if (!inet_diag_table[proto])
aec8dc62
PE		 56 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
57 NETLINK_SOCK_DIAG, AF_INET, proto);
d523a328
HX		 58
59 mutex_lock(&inet_diag_table_mutex);
f13c95f0 60 if (!inet_diag_table[proto])
d523a328
HX		 61 return ERR_PTR(-ENOENT);
62
f13c95f0 63 return inet_diag_table[proto];
d523a328
HX		 64}
65
e31c5e0e 66static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
d523a328
HX		 67{
68 mutex_unlock(&inet_diag_table_mutex);
69}
70
cb2050a7 71void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
a4458343
ED		 72{
73 r->idiag_family = sk->sk_family;
74
75 r->id.idiag_sport = htons(sk->sk_num);
76 r->id.idiag_dport = sk->sk_dport;
77 r->id.idiag_if = sk->sk_bound_dev_if;
78 sock_diag_save_cookie(sk, r->id.idiag_cookie);
79
80#if IS_ENABLED(CONFIG_IPV6)
81 if (sk->sk_family == AF_INET6) {
82 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
83 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
84 } else
85#endif
86 {
87 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
88 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
89
90 r->id.idiag_src[0] = sk->sk_rcv_saddr;
91 r->id.idiag_dst[0] = sk->sk_daddr;
92 }
93}
cb2050a7 94EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
a4458343 95
c8e2c80d
ED		 96static size_t inet_sk_attr_size(void)
97{
98 return nla_total_size(sizeof(struct tcp_info))
99 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
100 + nla_total_size(1) /* INET_DIAG_TOS */
101 + nla_total_size(1) /* INET_DIAG_TCLASS */
d545caca 102 + nla_total_size(4) /* INET_DIAG_MARK */
c8e2c80d
ED		 103 + nla_total_size(sizeof(struct inet_diag_meminfo))
104 + nla_total_size(sizeof(struct inet_diag_msg))
105 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
106 + nla_total_size(TCP_CA_NAME_MAX)
107 + nla_total_size(sizeof(struct tcpvegas_info))
108 + 64;
109}
110
cb2050a7
XL		 111int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
112 struct inet_diag_msg *r, int ext,
d545caca
LC		 113 struct user_namespace *user_ns,
114 bool net_admin)
cb2050a7
XL		 115{
116 const struct inet_sock *inet = inet_sk(sk);
117
118 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
119 goto errout;
120
121 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
122 * hence this needs to be included regardless of socket family.
123 */
124 if (ext & (1 << (INET_DIAG_TOS - 1)))
125 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
126 goto errout;
127
128#if IS_ENABLED(CONFIG_IPV6)
129 if (r->idiag_family == AF_INET6) {
130 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
131 if (nla_put_u8(skb, INET_DIAG_TCLASS,
132 inet6_sk(sk)->tclass) < 0)
133 goto errout;
134
135 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
136 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
137 goto errout;
138 }
139#endif
140
d545caca
LC		 141 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
142 goto errout;
143
cb2050a7
XL		 144 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
145 r->idiag_inode = sock_i_ino(sk);
146
147 return 0;
148errout:
149 return 1;
150}
151EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
152
3c4d05c8 153int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
34160ea3 154 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
e31c5e0e
ED		 155 struct user_namespace *user_ns,
156 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca
LC		 157 const struct nlmsghdr *unlh,
158 bool net_admin)
1da177e4 159{
521f1cf1 160 const struct tcp_congestion_ops *ca_ops;
e31c5e0e
ED		 161 const struct inet_diag_handler *handler;
162 int ext = req->idiag_ext;
73c1f4a0 163 struct inet_diag_msg *r;
1da177e4 164 struct nlmsghdr *nlh;
6e277ed5 165 struct nlattr *attr;
4f5736c4 166 void *info = NULL;
4f5736c4 167
a029fe26 168 handler = inet_diag_table[req->sdiag_protocol];
e31c5e0e 169 BUG_ON(!handler);
1da177e4 170
15e47304 171 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 172 nlmsg_flags);
173 if (!nlh)
d106352d 174 return -EMSGSIZE;
4f5736c4 175
d106352d 176 r = nlmsg_data(nlh);
a58917f5 177 BUG_ON(!sk_fullsock(sk));
c7d58aab 178
a4458343 179 inet_diag_msg_common_fill(r, sk);
73c1f4a0
ACM		 180 r->idiag_state = sk->sk_state;
181 r->idiag_timer = 0;
182 r->idiag_retrans = 0;
1da177e4 183
d545caca 184 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
e4e541a8
PE		 185 goto errout;
186
6e277ed5
TG		 187 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
188 struct inet_diag_meminfo minfo = {
189 .idiag_rmem = sk_rmem_alloc_get(sk),
190 .idiag_wmem = sk->sk_wmem_queued,
191 .idiag_fmem = sk->sk_forward_alloc,
192 .idiag_tmem = sk_wmem_alloc_get(sk),
193 };
194
195 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
196 goto errout;
3c4d05c8
PE		 197 }
198
c0636faa
PE		 199 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
200 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
6e277ed5 201 goto errout;
c0636faa 202
432490f9
CG		 203 /*
204 * RAW sockets might have user-defined protocols assigned,
205 * so report the one supplied on socket creation.
206 */
207 if (sk->sk_type == SOCK_RAW) {
208 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
209 goto errout;
210 }
211
e31c5e0e 212 if (!icsk) {
62ad6fcd 213 handler->idiag_get_info(sk, r, NULL);
3c4d05c8
PE		 214 goto out;
215 }
216
6ba8a3b1
ND		 217 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
218 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
219 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
73c1f4a0
ACM		 220 r->idiag_timer = 1;
221 r->idiag_retrans = icsk->icsk_retransmits;
b7de529c
XL		 222 r->idiag_expires =
223 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
463c84b9 224 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
73c1f4a0
ACM		 225 r->idiag_timer = 4;
226 r->idiag_retrans = icsk->icsk_probes_out;
b7de529c
XL		 227 r->idiag_expires =
228 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
1da177e4 229 } else if (timer_pending(&sk->sk_timer)) {
73c1f4a0
ACM		 230 r->idiag_timer = 2;
231 r->idiag_retrans = icsk->icsk_probes_out;
b7de529c
XL		 232 r->idiag_expires =
233 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
1da177e4 234 } else {
73c1f4a0
ACM		 235 r->idiag_timer = 0;
236 r->idiag_expires = 0;
1da177e4 237 }
540722ff 238
3fd22af8 239 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
6ed46d12
ND		 240 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
241 handler->idiag_info_size,
242 INET_DIAG_PAD);
6e277ed5
TG		 243 if (!attr)
244 goto errout;
3c4d05c8 245
6e277ed5 246 info = nla_data(attr);
1da177e4
LT		 247 }
248
521f1cf1
ED		 249 if (ext & (1 << (INET_DIAG_CONG - 1))) {
250 int err = 0;
251
252 rcu_read_lock();
253 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
254 if (ca_ops)
255 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
256 rcu_read_unlock();
257 if (err < 0)
6e277ed5 258 goto errout;
521f1cf1 259 }
6e277ed5 260
4f5736c4 261 handler->idiag_get_info(sk, r, info);
1da177e4 262
521f1cf1 263 if (sk->sk_state < TCP_TIME_WAIT) {
64f40ff5
ED		 264 union tcp_cc_info info;
265 size_t sz = 0;
266 int attr;
521f1cf1
ED		 267
268 rcu_read_lock();
269 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
270 if (ca_ops && ca_ops->get_info)
64f40ff5 271 sz = ca_ops->get_info(sk, ext, &attr, &info);
521f1cf1 272 rcu_read_unlock();
64f40ff5 273 if (sz && nla_put(skb, attr, sz, &info) < 0)
521f1cf1
ED		 274 goto errout;
275 }
1da177e4 276
3c4d05c8 277out:
053c095a
JB		 278 nlmsg_end(skb, nlh);
279 return 0;
1da177e4 280
6e277ed5
TG		 281errout:
282 nlmsg_cancel(skb, nlh);
26932566 283 return -EMSGSIZE;
1da177e4 284}
3c4d05c8
PE		 285EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
286
287static int inet_csk_diag_fill(struct sock *sk,
e31c5e0e 288 struct sk_buff *skb,
34160ea3 289 const struct inet_diag_req_v2 *req,
d06ca956 290 struct user_namespace *user_ns,
15e47304 291 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca
LC		 292 const struct nlmsghdr *unlh,
293 bool net_admin)
3c4d05c8 294{
d545caca
LC		 295 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
296 portid, seq, nlmsg_flags, unlh, net_admin);
3c4d05c8 297}
1da177e4 298
33cf7c90 299static int inet_twsk_diag_fill(struct sock *sk,
e31c5e0e 300 struct sk_buff *skb,
15e47304 301 u32 portid, u32 seq, u16 nlmsg_flags,
c7d58aab
ACM		 302 const struct nlmsghdr *unlh)
303{
33cf7c90 304 struct inet_timewait_sock *tw = inet_twsk(sk);
c7d58aab 305 struct inet_diag_msg *r;
6e277ed5 306 struct nlmsghdr *nlh;
789f558c 307 long tmo;
d106352d 308
15e47304 309 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 310 nlmsg_flags);
311 if (!nlh)
d106352d 312 return -EMSGSIZE;
c7d58aab 313
d106352d 314 r = nlmsg_data(nlh);
c7d58aab
ACM		 315 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
316
789f558c 317 tmo = tw->tw_timer.expires - jiffies;
c7d58aab
ACM		 318 if (tmo < 0)
319 tmo = 0;
320
a4458343 321 inet_diag_msg_common_fill(r, sk);
c7d58aab 322 r->idiag_retrans = 0;
b1aac815 323
c7d58aab
ACM		 324 r->idiag_state = tw->tw_substate;
325 r->idiag_timer = 3;
96f817fe 326 r->idiag_expires = jiffies_to_msecs(tmo);
c7d58aab
ACM		 327 r->idiag_rqueue = 0;
328 r->idiag_wqueue = 0;
329 r->idiag_uid = 0;
330 r->idiag_inode = 0;
6e277ed5 331
053c095a
JB		 332 nlmsg_end(skb, nlh);
333 return 0;
c7d58aab
ACM		 334}
335
a58917f5
ED		 336static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
337 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca 338 const struct nlmsghdr *unlh, bool net_admin)
a58917f5 339{
d545caca 340 struct request_sock *reqsk = inet_reqsk(sk);
a58917f5
ED		 341 struct inet_diag_msg *r;
342 struct nlmsghdr *nlh;
343 long tmo;
344
345 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
346 nlmsg_flags);
347 if (!nlh)
348 return -EMSGSIZE;
349
350 r = nlmsg_data(nlh);
351 inet_diag_msg_common_fill(r, sk);
352 r->idiag_state = TCP_SYN_RECV;
353 r->idiag_timer = 1;
d545caca 354 r->idiag_retrans = reqsk->num_retrans;
a58917f5
ED		 355
356 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
357 offsetof(struct sock, sk_cookie));
358
fa76ce73 359 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
a58917f5
ED		 360 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
361 r->idiag_rqueue = 0;
362 r->idiag_wqueue = 0;
363 r->idiag_uid = 0;
364 r->idiag_inode = 0;
365
d545caca
LC		 366 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
367 inet_rsk(reqsk)->ir_mark))
368 return -EMSGSIZE;
369
a58917f5
ED		 370 nlmsg_end(skb, nlh);
371 return 0;
372}
373
dff2c035 374static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
34160ea3 375 const struct inet_diag_req_v2 *r,
d06ca956 376 struct user_namespace *user_ns,
15e47304 377 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca 378 const struct nlmsghdr *unlh, bool net_admin)
dff2c035
ACM		 379{
380 if (sk->sk_state == TCP_TIME_WAIT)
a58917f5 381 return inet_twsk_diag_fill(sk, skb, portid, seq,
efe4208f
ED		 382 nlmsg_flags, unlh);
383
a58917f5
ED		 384 if (sk->sk_state == TCP_NEW_SYN_RECV)
385 return inet_req_diag_fill(sk, skb, portid, seq,
d545caca 386 nlmsg_flags, unlh, net_admin);
a58917f5 387
efe4208f 388 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
d545caca 389 nlmsg_flags, unlh, net_admin);
dff2c035
ACM		 390}
391
b613f56e
LC		 392struct sock *inet_diag_find_one_icsk(struct net *net,
393 struct inet_hashinfo *hashinfo,
394 const struct inet_diag_req_v2 *req)
1da177e4 395{
e31c5e0e 396 struct sock *sk;
d523a328 397
2d331915 398 rcu_read_lock();
e31c5e0e 399 if (req->sdiag_family == AF_INET)
a583636a 400 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
73c1f4a0
ACM		 401 req->id.idiag_dport, req->id.idiag_src[0],
402 req->id.idiag_sport, req->id.idiag_if);
dfd56b8b 403#if IS_ENABLED(CONFIG_IPV6)
7c130672
ED		 404 else if (req->sdiag_family == AF_INET6) {
405 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
406 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
a583636a 407 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
7c130672
ED		 408 req->id.idiag_dport, req->id.idiag_src[3],
409 req->id.idiag_sport, req->id.idiag_if);
410 else
a583636a 411 sk = inet6_lookup(net, hashinfo, NULL, 0,
7c130672
ED		 412 (struct in6_addr *)req->id.idiag_dst,
413 req->id.idiag_dport,
414 (struct in6_addr *)req->id.idiag_src,
415 req->id.idiag_sport,
416 req->id.idiag_if);
417 }
1da177e4 418#endif
2d331915
ED		 419 else {
420 rcu_read_unlock();
b613f56e 421 return ERR_PTR(-EINVAL);
2d331915
ED		 422 }
423 rcu_read_unlock();
e31c5e0e 424 if (!sk)
b613f56e 425 return ERR_PTR(-ENOENT);
1da177e4 426
b613f56e
LC		 427 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
428 sock_gen_put(sk);
429 return ERR_PTR(-ENOENT);
430 }
431
432 return sk;
433}
434EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
435
436int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
437 struct sk_buff *in_skb,
438 const struct nlmsghdr *nlh,
439 const struct inet_diag_req_v2 *req)
440{
441 struct net *net = sock_net(in_skb->sk);
442 struct sk_buff *rep;
443 struct sock *sk;
444 int err;
445
446 sk = inet_diag_find_one_icsk(net, hashinfo, req);
447 if (IS_ERR(sk))
448 return PTR_ERR(sk);
1da177e4 449
c8e2c80d 450 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
6e277ed5
TG		 451 if (!rep) {
452 err = -ENOMEM;
1da177e4 453 goto out;
6e277ed5 454 }
1da177e4 455
a029fe26 456 err = sk_diag_fill(sk, rep, req,
e32123e5 457 sk_user_ns(NETLINK_CB(in_skb).sk),
15e47304 458 NETLINK_CB(in_skb).portid,
d545caca
LC		 459 nlh->nlmsg_seq, 0, nlh,
460 netlink_net_capable(in_skb, CAP_NET_ADMIN));
26932566
PM		 461 if (err < 0) {
462 WARN_ON(err == -EMSGSIZE);
6e277ed5 463 nlmsg_free(rep);
26932566
PM		 464 goto out;
465 }
15e47304 466 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
73c1f4a0 467 MSG_DONTWAIT);
1da177e4
LT		 468 if (err > 0)
469 err = 0;
470
471out:
c1d607cc
ED		 472 if (sk)
473 sock_gen_put(sk);
474
476f7dbf
PE		 475 return err;
476}
1942c518 477EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
476f7dbf 478
6eb5d2e0 479static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
476f7dbf 480 const struct nlmsghdr *nlh,
34160ea3 481 const struct inet_diag_req_v2 *req)
476f7dbf
PE		 482{
483 const struct inet_diag_handler *handler;
484 int err;
485
486 handler = inet_diag_lock_handler(req->sdiag_protocol);
487 if (IS_ERR(handler))
488 err = PTR_ERR(handler);
6eb5d2e0 489 else if (cmd == SOCK_DIAG_BY_FAMILY)
1942c518 490 err = handler->dump_one(in_skb, nlh, req);
6eb5d2e0
LC		 491 else if (cmd == SOCK_DESTROY && handler->destroy)
492 err = handler->destroy(in_skb, req);
493 else
494 err = -EOPNOTSUPP;
d523a328 495 inet_diag_unlock_handler(handler);
476f7dbf 496
1da177e4
LT		 497 return err;
498}
499
9f855299 500static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
1da177e4
LT		 501{
502 int words = bits >> 5;
503
504 bits &= 0x1f;
505
506 if (words) {
507 if (memcmp(a1, a2, words << 2))
508 return 0;
509 }
510 if (bits) {
9f855299
AV		 511 __be32 w1, w2;
512 __be32 mask;
1da177e4
LT		 513
514 w1 = a1[words];
515 w2 = a2[words];
516
517 mask = htonl((0xffffffff) << (32 - bits));
518
519 if ((w1 ^ w2) & mask)
520 return 0;
521 }
522
523 return 1;
524}
525
87c22ea5 526static int inet_diag_bc_run(const struct nlattr *_bc,
e31c5e0e 527 const struct inet_diag_entry *entry)
1da177e4 528{
87c22ea5
PE		 529 const void *bc = nla_data(_bc);
530 int len = nla_len(_bc);
531
1da177e4
LT		 532 while (len > 0) {
533 int yes = 1;
73c1f4a0 534 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 535
536 switch (op->code) {
73c1f4a0 537 case INET_DIAG_BC_NOP:
1da177e4 538 break;
73c1f4a0 539 case INET_DIAG_BC_JMP:
1da177e4
LT		 540 yes = 0;
541 break;
73c1f4a0 542 case INET_DIAG_BC_S_GE:
1da177e4
LT		 543 yes = entry->sport >= op[1].no;
544 break;
73c1f4a0 545 case INET_DIAG_BC_S_LE:
b4ced2b7 546 yes = entry->sport <= op[1].no;
1da177e4 547 break;
73c1f4a0 548 case INET_DIAG_BC_D_GE:
1da177e4
LT		 549 yes = entry->dport >= op[1].no;
550 break;
73c1f4a0 551 case INET_DIAG_BC_D_LE:
1da177e4
LT		 552 yes = entry->dport <= op[1].no;
553 break;
73c1f4a0 554 case INET_DIAG_BC_AUTO:
1da177e4
LT		 555 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
556 break;
73c1f4a0 557 case INET_DIAG_BC_S_COND:
a8c2190e 558 case INET_DIAG_BC_D_COND: {
e31c5e0e
ED		 559 const struct inet_diag_hostcond *cond;
560 const __be32 *addr;
1da177e4 561
e31c5e0e 562 cond = (const struct inet_diag_hostcond *)(op + 1);
1da177e4 563 if (cond->port != -1 &&
73c1f4a0 564 cond->port != (op->code == INET_DIAG_BC_S_COND ?
1da177e4
LT		 565 entry->sport : entry->dport)) {
566 yes = 0;
567 break;
568 }
4e852c02 569
73c1f4a0 570 if (op->code == INET_DIAG_BC_S_COND)
1da177e4
LT		 571 addr = entry->saddr;
572 else
573 addr = entry->daddr;
574
f67caec9
NC		 575 if (cond->family != AF_UNSPEC &&
576 cond->family != entry->family) {
577 if (entry->family == AF_INET6 &&
578 cond->family == AF_INET) {
579 if (addr[0] == 0 && addr[1] == 0 &&
580 addr[2] == htonl(0xffff) &&
581 bitstring_match(addr + 3,
582 cond->addr,
583 cond->prefix_len))
584 break;
585 }
586 yes = 0;
587 break;
588 }
589
590 if (cond->prefix_len == 0)
591 break;
4e852c02
ACM		 592 if (bitstring_match(addr, cond->addr,
593 cond->prefix_len))
1da177e4 594 break;
1da177e4
LT		 595 yes = 0;
596 break;
597 }
637c841d
DA		 598 case INET_DIAG_BC_DEV_COND: {
599 u32 ifindex;
600
601 ifindex = *((const u32 *)(op + 1));
602 if (ifindex != entry->ifindex)
603 yes = 0;
604 break;
605 }
a52e95ab
LC		 606 case INET_DIAG_BC_MARK_COND: {
607 struct inet_diag_markcond *cond;
608
609 cond = (struct inet_diag_markcond *)(op + 1);
610 if ((entry->mark & cond->mask) != cond->mark)
611 yes = 0;
612 break;
613 }
1da177e4
LT		 614 }
615
4e852c02 616 if (yes) {
1da177e4
LT		 617 len -= op->yes;
618 bc += op->yes;
619 } else {
620 len -= op->no;
621 bc += op->no;
622 }
623 }
a02cec21 624 return len == 0;
1da177e4
LT		 625}
626
a4458343
ED		 627/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
628 */
629static void entry_fill_addrs(struct inet_diag_entry *entry,
630 const struct sock *sk)
631{
632#if IS_ENABLED(CONFIG_IPV6)
633 if (sk->sk_family == AF_INET6) {
634 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
635 entry->daddr = sk->sk_v6_daddr.s6_addr32;
636 } else
637#endif
638 {
639 entry->saddr = &sk->sk_rcv_saddr;
640 entry->daddr = &sk->sk_daddr;
641 }
642}
643
8d07d151
PE		 644int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
645{
8d07d151 646 struct inet_sock *inet = inet_sk(sk);
e31c5e0e 647 struct inet_diag_entry entry;
8d07d151 648
e31c5e0e 649 if (!bc)
8d07d151
PE		 650 return 1;
651
652 entry.family = sk->sk_family;
a4458343 653 entry_fill_addrs(&entry, sk);
8d07d151
PE		 654 entry.sport = inet->inet_num;
655 entry.dport = ntohs(inet->inet_dport);
637c841d 656 entry.ifindex = sk->sk_bound_dev_if;
a58917f5 657 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
a52e95ab
LC		 658 if (sk_fullsock(sk))
659 entry.mark = sk->sk_mark;
660 else if (sk->sk_state == TCP_NEW_SYN_RECV)
661 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
662 else
663 entry.mark = 0;
8d07d151
PE		 664
665 return inet_diag_bc_run(bc, &entry);
666}
667EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
668
1da177e4
LT		 669static int valid_cc(const void *bc, int len, int cc)
670{
671 while (len >= 0) {
73c1f4a0 672 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 673
674 if (cc > len)
675 return 0;
676 if (cc == len)
677 return 1;
eeb14972 678 if (op->yes < 4 || op->yes & 3)
1da177e4
LT		 679 return 0;
680 len -= op->yes;
681 bc += op->yes;
682 }
683 return 0;
684}
685
637c841d
DA		 686/* data is u32 ifindex */
687static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
688 int *min_len)
689{
690 /* Check ifindex space. */
691 *min_len += sizeof(u32);
692 if (len < *min_len)
693 return false;
694
695 return true;
696}
405c0059
NC		 697/* Validate an inet_diag_hostcond. */
698static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
699 int *min_len)
700{
405c0059 701 struct inet_diag_hostcond *cond;
e31c5e0e 702 int addr_len;
405c0059
NC		 703
704 /* Check hostcond space. */
705 *min_len += sizeof(struct inet_diag_hostcond);
706 if (len < *min_len)
707 return false;
708 cond = (struct inet_diag_hostcond *)(op + 1);
709
710 /* Check address family and address length. */
711 switch (cond->family) {
712 case AF_UNSPEC:
713 addr_len = 0;
714 break;
715 case AF_INET:
716 addr_len = sizeof(struct in_addr);
717 break;
718 case AF_INET6:
719 addr_len = sizeof(struct in6_addr);
720 break;
721 default:
722 return false;
723 }
724 *min_len += addr_len;
725 if (len < *min_len)
726 return false;
727
728 /* Check prefix length (in bits) vs address length (in bytes). */
729 if (cond->prefix_len > 8 * addr_len)
730 return false;
731
732 return true;
733}
734
5e1f5420 735/* Validate a port comparison operator. */
e31c5e0e
ED		 736static bool valid_port_comparison(const struct inet_diag_bc_op *op,
737 int len, int *min_len)
5e1f5420
NC		 738{
739 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
740 *min_len += sizeof(struct inet_diag_bc_op);
741 if (len < *min_len)
742 return false;
743 return true;
744}
745
a52e95ab
LC		 746static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
747 int *min_len)
1da177e4 748{
a52e95ab
LC		 749 *min_len += sizeof(struct inet_diag_markcond);
750 return len >= *min_len;
751}
752
753static int inet_diag_bc_audit(const struct nlattr *attr,
754 const struct sk_buff *skb)
755{
756 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
627cc4ad
LC		 757 const void *bytecode, *bc;
758 int bytecode_len, len;
759
760 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
761 return -EINVAL;
762
763 bytecode = bc = nla_data(attr);
764 len = bytecode_len = nla_len(attr);
1da177e4
LT		 765
766 while (len > 0) {
405c0059 767 int min_len = sizeof(struct inet_diag_bc_op);
e31c5e0e 768 const struct inet_diag_bc_op *op = bc;
1da177e4 769
1da177e4 770 switch (op->code) {
73c1f4a0
ACM		 771 case INET_DIAG_BC_S_COND:
772 case INET_DIAG_BC_D_COND:
405c0059
NC		 773 if (!valid_hostcond(bc, len, &min_len))
774 return -EINVAL;
5e1f5420 775 break;
637c841d
DA		 776 case INET_DIAG_BC_DEV_COND:
777 if (!valid_devcond(bc, len, &min_len))
778 return -EINVAL;
779 break;
73c1f4a0
ACM		 780 case INET_DIAG_BC_S_GE:
781 case INET_DIAG_BC_S_LE:
782 case INET_DIAG_BC_D_GE:
783 case INET_DIAG_BC_D_LE:
5e1f5420 784 if (!valid_port_comparison(bc, len, &min_len))
1da177e4
LT		 785 return -EINVAL;
786 break;
a52e95ab
LC		 787 case INET_DIAG_BC_MARK_COND:
788 if (!net_admin)
789 return -EPERM;
790 if (!valid_markcond(bc, len, &min_len))
791 return -EINVAL;
792 break;
5e1f5420
NC		 793 case INET_DIAG_BC_AUTO:
794 case INET_DIAG_BC_JMP:
73c1f4a0 795 case INET_DIAG_BC_NOP:
1da177e4
LT		 796 break;
797 default:
798 return -EINVAL;
799 }
5e1f5420
NC		 800
801 if (op->code != INET_DIAG_BC_NOP) {
802 if (op->no < min_len || op->no > len + 4 || op->no & 3)
803 return -EINVAL;
804 if (op->no < len &&
805 !valid_cc(bytecode, bytecode_len, len - op->no))
806 return -EINVAL;
807 }
808
405c0059 809 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
eeb14972 810 return -EINVAL;
4e852c02 811 bc += op->yes;
1da177e4
LT		 812 len -= op->yes;
813 }
814 return len == 0 ? 0 : -EINVAL;
815}
816
dff2c035
ACM		 817static int inet_csk_diag_dump(struct sock *sk,
818 struct sk_buff *skb,
37f352b5 819 struct netlink_callback *cb,
34160ea3 820 const struct inet_diag_req_v2 *r,
d545caca
LC		 821 const struct nlattr *bc,
822 bool net_admin)
1da177e4 823{
8d07d151
PE		 824 if (!inet_diag_bc_sk(bc, sk))
825 return 0;
1da177e4 826
a029fe26 827 return inet_csk_diag_fill(sk, skb, r,
e32123e5 828 sk_user_ns(NETLINK_CB(cb->skb).sk),
15e47304 829 NETLINK_CB(cb->skb).portid,
d545caca
LC		 830 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
831 net_admin);
1da177e4
LT		 832}
833
49612729
ED		 834static void twsk_build_assert(void)
835{
836 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
837 offsetof(struct sock, sk_family));
838
839 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
840 offsetof(struct inet_sock, inet_num));
841
842 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
843 offsetof(struct inet_sock, inet_dport));
844
845 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
846 offsetof(struct inet_sock, inet_rcv_saddr));
847
848 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
849 offsetof(struct inet_sock, inet_daddr));
850
851#if IS_ENABLED(CONFIG_IPV6)
852 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
853 offsetof(struct sock, sk_v6_rcv_saddr));
854
855 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
856 offsetof(struct sock, sk_v6_daddr));
857#endif
858}
859
1942c518 860void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
e31c5e0e 861 struct netlink_callback *cb,
34160ea3 862 const struct inet_diag_req_v2 *r, struct nlattr *bc)
1da177e4 863{
67db3e4b 864 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
51d7cccf 865 struct net *net = sock_net(skb->sk);
079096f1 866 u32 idiag_states = r->idiag_states;
67db3e4b
ED		 867 int i, num, s_i, s_num;
868 struct sock *sk;
4e852c02 869
079096f1
ED		 870 if (idiag_states & TCPF_SYN_RECV)
871 idiag_states |= TCPF_NEW_SYN_RECV;
1da177e4
LT		 872 s_i = cb->args[1];
873 s_num = num = cb->args[2];
4f5736c4 874
1da177e4 875 if (cb->args[0] == 0) {
9652dc2e 876 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1da177e4 877 goto skip_listen_ht;
540722ff 878
0f7ff927 879 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
5caea4ea 880 struct inet_listen_hashbucket *ilb;
1da177e4
LT		 881
882 num = 0;
5caea4ea 883 ilb = &hashinfo->listening_hash[i];
9652dc2e 884 spin_lock(&ilb->lock);
3b24d854 885 sk_for_each(sk, &ilb->head) {
1da177e4
LT		 886 struct inet_sock *inet = inet_sk(sk);
887
51d7cccf
AV		 888 if (!net_eq(sock_net(sk), net))
889 continue;
890
1da177e4
LT		 891 if (num < s_num) {
892 num++;
893 continue;
894 }
895
d23deaa0 896 if (r->sdiag_family != AF_UNSPEC &&
e31c5e0e 897 sk->sk_family != r->sdiag_family)
d23deaa0
PE		 898 goto next_listen;
899
c720c7e8 900 if (r->id.idiag_sport != inet->inet_sport &&
73c1f4a0 901 r->id.idiag_sport)
1da177e4
LT		 902 goto next_listen;
903
d545caca
LC		 904 if (inet_csk_diag_dump(sk, skb, cb, r,
905 bc, net_admin) < 0) {
9652dc2e 906 spin_unlock(&ilb->lock);
1da177e4
LT		 907 goto done;
908 }
909
910next_listen:
1da177e4
LT		 911 ++num;
912 }
9652dc2e 913 spin_unlock(&ilb->lock);
1da177e4
LT		 914
915 s_num = 0;
1da177e4 916 }
1da177e4
LT		 917skip_listen_ht:
918 cb->args[0] = 1;
919 s_i = num = s_num = 0;
920 }
921
079096f1 922 if (!(idiag_states & ~TCPF_LISTEN))
efb3cb42 923 goto out;
1da177e4 924
67db3e4b 925#define SKARR_SZ 16
f373b53b 926 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
540722ff 927 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
7e3aab4a 928 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
3ab5aee7 929 struct hlist_nulls_node *node;
67db3e4b
ED		 930 struct sock *sk_arr[SKARR_SZ];
931 int num_arr[SKARR_SZ];
932 int idx, accum, res;
6be547a6 933
05dbc7b5 934 if (hlist_nulls_empty(&head->chain))
6be547a6
AK		 935 continue;
936
1da177e4
LT		 937 if (i > s_i)
938 s_num = 0;
939
67db3e4b
ED		 940next_chunk:
941 num = 0;
942 accum = 0;
7e3aab4a 943 spin_lock_bh(lock);
3ab5aee7 944 sk_nulls_for_each(sk, node, &head->chain) {
67db3e4b 945 int state;
1da177e4 946
51d7cccf
AV		 947 if (!net_eq(sock_net(sk), net))
948 continue;
1da177e4
LT		 949 if (num < s_num)
950 goto next_normal;
70315d22
NC		 951 state = (sk->sk_state == TCP_TIME_WAIT) ?
952 inet_twsk(sk)->tw_substate : sk->sk_state;
079096f1 953 if (!(idiag_states & (1 << state)))
1da177e4 954 goto next_normal;
d23deaa0 955 if (r->sdiag_family != AF_UNSPEC &&
05dbc7b5 956 sk->sk_family != r->sdiag_family)
d23deaa0 957 goto next_normal;
05dbc7b5 958 if (r->id.idiag_sport != htons(sk->sk_num) &&
73c1f4a0 959 r->id.idiag_sport)
1da177e4 960 goto next_normal;
05dbc7b5 961 if (r->id.idiag_dport != sk->sk_dport &&
4e852c02 962 r->id.idiag_dport)
1da177e4 963 goto next_normal;
a58917f5
ED		 964 twsk_build_assert();
965
966 if (!inet_diag_bc_sk(bc, sk))
967 goto next_normal;
968
67db3e4b
ED		 969 sock_hold(sk);
970 num_arr[accum] = num;
971 sk_arr[accum] = sk;
972 if (++accum == SKARR_SZ)
973 break;
974next_normal:
975 ++num;
976 }
977 spin_unlock_bh(lock);
978 res = 0;
979 for (idx = 0; idx < accum; idx++) {
980 if (res >= 0) {
981 res = sk_diag_fill(sk_arr[idx], skb, r,
a58917f5
ED		 982 sk_user_ns(NETLINK_CB(cb->skb).sk),
983 NETLINK_CB(cb->skb).portid,
984 cb->nlh->nlmsg_seq, NLM_F_MULTI,
d545caca 985 cb->nlh, net_admin);
67db3e4b
ED		 986 if (res < 0)
987 num = num_arr[idx];
1da177e4 988 }
67db3e4b 989 sock_gen_put(sk_arr[idx]);
1da177e4 990 }
67db3e4b
ED		 991 if (res < 0)
992 break;
acffb584 993 cond_resched();
67db3e4b
ED		 994 if (accum == SKARR_SZ) {
995 s_num = num + 1;
996 goto next_chunk;
997 }
1da177e4
LT		 998 }
999
1000done:
1001 cb->args[1] = i;
1002 cb->args[2] = num;
efb3cb42
PE		 1003out:
1004 ;
1005}
1942c518 1006EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
efb3cb42
PE		 1007
1008static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
34160ea3 1009 const struct inet_diag_req_v2 *r,
e31c5e0e 1010 struct nlattr *bc)
efb3cb42
PE		 1011{
1012 const struct inet_diag_handler *handler;
cacb6ba0 1013 int err = 0;
efb3cb42
PE		 1014
1015 handler = inet_diag_lock_handler(r->sdiag_protocol);
1016 if (!IS_ERR(handler))
1942c518 1017 handler->dump(skb, cb, r, bc);
cacb6ba0
CG		 1018 else
1019 err = PTR_ERR(handler);
d523a328 1020 inet_diag_unlock_handler(handler);
efb3cb42 1021
cacb6ba0 1022 return err ? : skb->len;
1da177e4
LT		 1023}
1024
25c4cd2b
PE		 1025static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1026{
c8991362 1027 int hdrlen = sizeof(struct inet_diag_req_v2);
e31c5e0e 1028 struct nlattr *bc = NULL;
25c4cd2b
PE		 1029
1030 if (nlmsg_attrlen(cb->nlh, hdrlen))
1031 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1032
d106352d 1033 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
25c4cd2b
PE		 1034}
1035
e31c5e0e 1036static int inet_diag_type2proto(int type)
a029fe26
PE		 1037{
1038 switch (type) {
1039 case TCPDIAG_GETSOCK:
1040 return IPPROTO_TCP;
1041 case DCCPDIAG_GETSOCK:
1042 return IPPROTO_DCCP;
1043 default:
1044 return 0;
1045 }
1046}
1047
e31c5e0e
ED		 1048static int inet_diag_dump_compat(struct sk_buff *skb,
1049 struct netlink_callback *cb)
25c4cd2b 1050{
d106352d 1051 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
e31c5e0e 1052 int hdrlen = sizeof(struct inet_diag_req);
c8991362 1053 struct inet_diag_req_v2 req;
25c4cd2b 1054 struct nlattr *bc = NULL;
25c4cd2b 1055
d23deaa0 1056 req.sdiag_family = AF_UNSPEC; /* compatibility */
25c4cd2b
PE		 1057 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1058 req.idiag_ext = rc->idiag_ext;
1059 req.idiag_states = rc->idiag_states;
1060 req.id = rc->id;
1061
1062 if (nlmsg_attrlen(cb->nlh, hdrlen))
1063 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1064
1065 return __inet_diag_dump(skb, cb, &req, bc);
1066}
1067
fe50ce28 1068static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
e31c5e0e 1069 const struct nlmsghdr *nlh)
fe50ce28 1070{
d106352d 1071 struct inet_diag_req *rc = nlmsg_data(nlh);
c8991362 1072 struct inet_diag_req_v2 req;
fe50ce28
PE		 1073
1074 req.sdiag_family = rc->idiag_family;
1075 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1076 req.idiag_ext = rc->idiag_ext;
1077 req.idiag_states = rc->idiag_states;
1078 req.id = rc->id;
1079
6eb5d2e0 1080 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
fe50ce28
PE		 1081}
1082
8d34172d 1083static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 1084{
3b09c84c 1085 int hdrlen = sizeof(struct inet_diag_req);
51d7cccf 1086 struct net *net = sock_net(skb->sk);
1da177e4 1087
ead592ba
TG		 1088 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1089 nlmsg_len(nlh) < hdrlen)
1090 return -EINVAL;
1da177e4 1091
b8f3ab42 1092 if (nlh->nlmsg_flags & NLM_F_DUMP) {
ead592ba
TG		 1093 if (nlmsg_attrlen(nlh, hdrlen)) {
1094 struct nlattr *attr;
627cc4ad 1095 int err;
1da177e4 1096
ead592ba
TG		 1097 attr = nlmsg_find_attr(nlh, hdrlen,
1098 INET_DIAG_REQ_BYTECODE);
a52e95ab 1099 err = inet_diag_bc_audit(attr, skb);
627cc4ad
LC		 1100 if (err)
1101 return err;
ead592ba 1102 }
80d326fa
PNA		 1103 {
1104 struct netlink_dump_control c = {
1105 .dump = inet_diag_dump_compat,
1106 };
51d7cccf 1107 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
80d326fa 1108 }
1da177e4 1109 }
ead592ba 1110
fe50ce28 1111 return inet_diag_get_exact_compat(skb, nlh);
1da177e4
LT		 1112}
1113
6eb5d2e0 1114static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
d366477a 1115{
c8991362 1116 int hdrlen = sizeof(struct inet_diag_req_v2);
51d7cccf 1117 struct net *net = sock_net(skb->sk);
d366477a
PE		 1118
1119 if (nlmsg_len(h) < hdrlen)
1120 return -EINVAL;
1121
6eb5d2e0
LC		 1122 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1123 h->nlmsg_flags & NLM_F_DUMP) {
25c4cd2b
PE		 1124 if (nlmsg_attrlen(h, hdrlen)) {
1125 struct nlattr *attr;
627cc4ad 1126 int err;
e31c5e0e 1127
25c4cd2b
PE		 1128 attr = nlmsg_find_attr(h, hdrlen,
1129 INET_DIAG_REQ_BYTECODE);
a52e95ab 1130 err = inet_diag_bc_audit(attr, skb);
627cc4ad
LC		 1131 if (err)
1132 return err;
25c4cd2b 1133 }
80d326fa
PNA		 1134 {
1135 struct netlink_dump_control c = {
1136 .dump = inet_diag_dump,
1137 };
51d7cccf 1138 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
80d326fa 1139 }
d366477a
PE		 1140 }
1141
6eb5d2e0 1142 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
d366477a
PE		 1143}
1144
35ac838a
CG		 1145static
1146int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1147{
1148 const struct inet_diag_handler *handler;
1149 struct nlmsghdr *nlh;
1150 struct nlattr *attr;
1151 struct inet_diag_msg *r;
1152 void *info = NULL;
1153 int err = 0;
1154
1155 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1156 if (!nlh)
1157 return -ENOMEM;
1158
1159 r = nlmsg_data(nlh);
1160 memset(r, 0, sizeof(*r));
1161 inet_diag_msg_common_fill(r, sk);
e0df02e0
CG		 1162 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1163 r->id.idiag_sport = inet_sk(sk)->inet_sport;
35ac838a
CG		 1164 r->idiag_state = sk->sk_state;
1165
1166 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1167 nlmsg_cancel(skb, nlh);
1168 return err;
1169 }
1170
1171 handler = inet_diag_lock_handler(sk->sk_protocol);
1172 if (IS_ERR(handler)) {
1173 inet_diag_unlock_handler(handler);
1174 nlmsg_cancel(skb, nlh);
1175 return PTR_ERR(handler);
1176 }
1177
1178 attr = handler->idiag_info_size
6ed46d12
ND		 1179 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1180 handler->idiag_info_size,
1181 INET_DIAG_PAD)
35ac838a
CG		 1182 : NULL;
1183 if (attr)
1184 info = nla_data(attr);
1185
1186 handler->idiag_get_info(sk, r, info);
1187 inet_diag_unlock_handler(handler);
1188
1189 nlmsg_end(skb, nlh);
1190 return 0;
1191}
1192
8dcf01fc 1193static const struct sock_diag_handler inet_diag_handler = {
d366477a 1194 .family = AF_INET,
6eb5d2e0 1195 .dump = inet_diag_handler_cmd,
35ac838a 1196 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1197 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1198};
1199
8dcf01fc 1200static const struct sock_diag_handler inet6_diag_handler = {
d366477a 1201 .family = AF_INET6,
6eb5d2e0 1202 .dump = inet_diag_handler_cmd,
35ac838a 1203 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1204 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1205};
1206
4f5736c4
ACM		 1207int inet_diag_register(const struct inet_diag_handler *h)
1208{
1209 const __u16 type = h->idiag_type;
1210 int err = -EINVAL;
1211
f13c95f0 1212 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1213 goto out;
1214
d523a328 1215 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1216 err = -EEXIST;
e31c5e0e 1217 if (!inet_diag_table[type]) {
4f5736c4
ACM		 1218 inet_diag_table[type] = h;
1219 err = 0;
1220 }
d523a328 1221 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1222out:
1223 return err;
1224}
1225EXPORT_SYMBOL_GPL(inet_diag_register);
1226
1227void inet_diag_unregister(const struct inet_diag_handler *h)
1228{
1229 const __u16 type = h->idiag_type;
1230
f13c95f0 1231 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1232 return;
1233
d523a328 1234 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1235 inet_diag_table[type] = NULL;
d523a328 1236 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1237}
1238EXPORT_SYMBOL_GPL(inet_diag_unregister);
1239
73c1f4a0 1240static int __init inet_diag_init(void)
1da177e4 1241{
f13c95f0 1242 const int inet_diag_table_size = (IPPROTO_MAX *
4f5736c4
ACM		 1243 sizeof(struct inet_diag_handler *));
1244 int err = -ENOMEM;
1245
0da974f4 1246 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
4f5736c4
ACM		 1247 if (!inet_diag_table)
1248 goto out;
1249
d366477a
PE		 1250 err = sock_diag_register(&inet_diag_handler);
1251 if (err)
1252 goto out_free_nl;
1253
1254 err = sock_diag_register(&inet6_diag_handler);
1255 if (err)
1256 goto out_free_inet;
1257
8ef874bf 1258 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4
ACM		 1259out:
1260 return err;
d366477a
PE		 1261
1262out_free_inet:
1263 sock_diag_unregister(&inet_diag_handler);
1264out_free_nl:
4f5736c4
ACM		 1265 kfree(inet_diag_table);
1266 goto out;
1da177e4
LT		 1267}
1268
73c1f4a0 1269static void __exit inet_diag_exit(void)
1da177e4 1270{
d366477a
PE		 1271 sock_diag_unregister(&inet6_diag_handler);
1272 sock_diag_unregister(&inet_diag_handler);
8ef874bf 1273 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4 1274 kfree(inet_diag_table);
1da177e4
LT		 1275}
1276
73c1f4a0
ACM		 1277module_init(inet_diag_init);
1278module_exit(inet_diag_exit);
1da177e4 1279MODULE_LICENSE("GPL");
aec8dc62
PE		 1280MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1281MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
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