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tcp: __tcp_hdrlen() helper
[deliverable/linux.git] / net / ipv4 / inet_diag.c
CommitLineData
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;
47};
48
d523a328
HX		 49static DEFINE_MUTEX(inet_diag_table_mutex);
50
f13c95f0 51static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
d523a328 52{
f13c95f0 53 if (!inet_diag_table[proto])
aec8dc62
PE		 54 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
55 NETLINK_SOCK_DIAG, AF_INET, proto);
d523a328
HX		 56
57 mutex_lock(&inet_diag_table_mutex);
f13c95f0 58 if (!inet_diag_table[proto])
d523a328
HX		 59 return ERR_PTR(-ENOENT);
60
f13c95f0 61 return inet_diag_table[proto];
d523a328
HX		 62}
63
e31c5e0e 64static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
d523a328
HX		 65{
66 mutex_unlock(&inet_diag_table_mutex);
67}
68
a4458343
ED		 69static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
70{
71 r->idiag_family = sk->sk_family;
72
73 r->id.idiag_sport = htons(sk->sk_num);
74 r->id.idiag_dport = sk->sk_dport;
75 r->id.idiag_if = sk->sk_bound_dev_if;
76 sock_diag_save_cookie(sk, r->id.idiag_cookie);
77
78#if IS_ENABLED(CONFIG_IPV6)
79 if (sk->sk_family == AF_INET6) {
80 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
81 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
82 } else
83#endif
84 {
85 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
86 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
87
88 r->id.idiag_src[0] = sk->sk_rcv_saddr;
89 r->id.idiag_dst[0] = sk->sk_daddr;
90 }
91}
92
c8e2c80d
ED		 93static size_t inet_sk_attr_size(void)
94{
95 return nla_total_size(sizeof(struct tcp_info))
96 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
97 + nla_total_size(1) /* INET_DIAG_TOS */
98 + nla_total_size(1) /* INET_DIAG_TCLASS */
99 + nla_total_size(sizeof(struct inet_diag_meminfo))
100 + nla_total_size(sizeof(struct inet_diag_msg))
101 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
102 + nla_total_size(TCP_CA_NAME_MAX)
103 + nla_total_size(sizeof(struct tcpvegas_info))
104 + 64;
105}
106
3c4d05c8 107int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
34160ea3 108 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
e31c5e0e
ED		 109 struct user_namespace *user_ns,
110 u32 portid, u32 seq, u16 nlmsg_flags,
111 const struct nlmsghdr *unlh)
1da177e4 112{
463c84b9 113 const struct inet_sock *inet = inet_sk(sk);
521f1cf1 114 const struct tcp_congestion_ops *ca_ops;
e31c5e0e
ED		 115 const struct inet_diag_handler *handler;
116 int ext = req->idiag_ext;
73c1f4a0 117 struct inet_diag_msg *r;
1da177e4 118 struct nlmsghdr *nlh;
6e277ed5 119 struct nlattr *attr;
4f5736c4 120 void *info = NULL;
4f5736c4 121
a029fe26 122 handler = inet_diag_table[req->sdiag_protocol];
e31c5e0e 123 BUG_ON(!handler);
1da177e4 124
15e47304 125 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 126 nlmsg_flags);
127 if (!nlh)
d106352d 128 return -EMSGSIZE;
4f5736c4 129
d106352d 130 r = nlmsg_data(nlh);
a58917f5 131 BUG_ON(!sk_fullsock(sk));
c7d58aab 132
a4458343 133 inet_diag_msg_common_fill(r, sk);
73c1f4a0
ACM		 134 r->idiag_state = sk->sk_state;
135 r->idiag_timer = 0;
136 r->idiag_retrans = 0;
1da177e4 137
e4e541a8
PE		 138 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
139 goto errout;
140
717b6d83
MŻ		 141 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
142 * hence this needs to be included regardless of socket family.
143 */
144 if (ext & (1 << (INET_DIAG_TOS - 1)))
6e277ed5
TG		 145 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
146 goto errout;
717b6d83 147
dfd56b8b 148#if IS_ENABLED(CONFIG_IPV6)
73c1f4a0 149 if (r->idiag_family == AF_INET6) {
06236ac3 150 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
efe4208f
ED		 151 if (nla_put_u8(skb, INET_DIAG_TCLASS,
152 inet6_sk(sk)->tclass) < 0)
6e277ed5 153 goto errout;
20462155 154
8220ea23
PS		 155 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
156 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
20462155 157 goto errout;
1da177e4
LT		 158 }
159#endif
160
d06ca956 161 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
3c4d05c8
PE		 162 r->idiag_inode = sock_i_ino(sk);
163
6e277ed5
TG		 164 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
165 struct inet_diag_meminfo minfo = {
166 .idiag_rmem = sk_rmem_alloc_get(sk),
167 .idiag_wmem = sk->sk_wmem_queued,
168 .idiag_fmem = sk->sk_forward_alloc,
169 .idiag_tmem = sk_wmem_alloc_get(sk),
170 };
171
172 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
173 goto errout;
3c4d05c8
PE		 174 }
175
c0636faa
PE		 176 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
177 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
6e277ed5 178 goto errout;
c0636faa 179
e31c5e0e 180 if (!icsk) {
62ad6fcd 181 handler->idiag_get_info(sk, r, NULL);
3c4d05c8
PE		 182 goto out;
183 }
184
172589cc 185#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
1da177e4 186
6ba8a3b1
ND		 187 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
188 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
189 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
73c1f4a0
ACM		 190 r->idiag_timer = 1;
191 r->idiag_retrans = icsk->icsk_retransmits;
192 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
463c84b9 193 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
73c1f4a0
ACM		 194 r->idiag_timer = 4;
195 r->idiag_retrans = icsk->icsk_probes_out;
196 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
1da177e4 197 } else if (timer_pending(&sk->sk_timer)) {
73c1f4a0
ACM		 198 r->idiag_timer = 2;
199 r->idiag_retrans = icsk->icsk_probes_out;
200 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
1da177e4 201 } else {
73c1f4a0
ACM		 202 r->idiag_timer = 0;
203 r->idiag_expires = 0;
1da177e4
LT		 204 }
205#undef EXPIRES_IN_MS
540722ff 206
3fd22af8 207 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
6e277ed5 208 attr = nla_reserve(skb, INET_DIAG_INFO,
3fd22af8 209 handler->idiag_info_size);
6e277ed5
TG		 210 if (!attr)
211 goto errout;
3c4d05c8 212
6e277ed5 213 info = nla_data(attr);
1da177e4
LT		 214 }
215
521f1cf1
ED		 216 if (ext & (1 << (INET_DIAG_CONG - 1))) {
217 int err = 0;
218
219 rcu_read_lock();
220 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
221 if (ca_ops)
222 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
223 rcu_read_unlock();
224 if (err < 0)
6e277ed5 225 goto errout;
521f1cf1 226 }
6e277ed5 227
4f5736c4 228 handler->idiag_get_info(sk, r, info);
1da177e4 229
521f1cf1 230 if (sk->sk_state < TCP_TIME_WAIT) {
64f40ff5
ED		 231 union tcp_cc_info info;
232 size_t sz = 0;
233 int attr;
521f1cf1
ED		 234
235 rcu_read_lock();
236 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
237 if (ca_ops && ca_ops->get_info)
64f40ff5 238 sz = ca_ops->get_info(sk, ext, &attr, &info);
521f1cf1 239 rcu_read_unlock();
64f40ff5 240 if (sz && nla_put(skb, attr, sz, &info) < 0)
521f1cf1
ED		 241 goto errout;
242 }
1da177e4 243
3c4d05c8 244out:
053c095a
JB		 245 nlmsg_end(skb, nlh);
246 return 0;
1da177e4 247
6e277ed5
TG		 248errout:
249 nlmsg_cancel(skb, nlh);
26932566 250 return -EMSGSIZE;
1da177e4 251}
3c4d05c8
PE		 252EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
253
254static int inet_csk_diag_fill(struct sock *sk,
e31c5e0e 255 struct sk_buff *skb,
34160ea3 256 const struct inet_diag_req_v2 *req,
d06ca956 257 struct user_namespace *user_ns,
15e47304 258 u32 portid, u32 seq, u16 nlmsg_flags,
3c4d05c8
PE		 259 const struct nlmsghdr *unlh)
260{
e31c5e0e
ED		 261 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
262 user_ns, portid, seq, nlmsg_flags, unlh);
3c4d05c8 263}
1da177e4 264
33cf7c90 265static int inet_twsk_diag_fill(struct sock *sk,
e31c5e0e 266 struct sk_buff *skb,
15e47304 267 u32 portid, u32 seq, u16 nlmsg_flags,
c7d58aab
ACM		 268 const struct nlmsghdr *unlh)
269{
33cf7c90 270 struct inet_timewait_sock *tw = inet_twsk(sk);
c7d58aab 271 struct inet_diag_msg *r;
6e277ed5 272 struct nlmsghdr *nlh;
789f558c 273 long tmo;
d106352d 274
15e47304 275 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 276 nlmsg_flags);
277 if (!nlh)
d106352d 278 return -EMSGSIZE;
c7d58aab 279
d106352d 280 r = nlmsg_data(nlh);
c7d58aab
ACM		 281 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
282
789f558c 283 tmo = tw->tw_timer.expires - jiffies;
c7d58aab
ACM		 284 if (tmo < 0)
285 tmo = 0;
286
a4458343 287 inet_diag_msg_common_fill(r, sk);
c7d58aab 288 r->idiag_retrans = 0;
b1aac815 289
c7d58aab
ACM		 290 r->idiag_state = tw->tw_substate;
291 r->idiag_timer = 3;
96f817fe 292 r->idiag_expires = jiffies_to_msecs(tmo);
c7d58aab
ACM		 293 r->idiag_rqueue = 0;
294 r->idiag_wqueue = 0;
295 r->idiag_uid = 0;
296 r->idiag_inode = 0;
6e277ed5 297
053c095a
JB		 298 nlmsg_end(skb, nlh);
299 return 0;
c7d58aab
ACM		 300}
301
a58917f5
ED		 302static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
303 u32 portid, u32 seq, u16 nlmsg_flags,
304 const struct nlmsghdr *unlh)
305{
306 struct inet_diag_msg *r;
307 struct nlmsghdr *nlh;
308 long tmo;
309
310 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
311 nlmsg_flags);
312 if (!nlh)
313 return -EMSGSIZE;
314
315 r = nlmsg_data(nlh);
316 inet_diag_msg_common_fill(r, sk);
317 r->idiag_state = TCP_SYN_RECV;
318 r->idiag_timer = 1;
319 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
320
321 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
322 offsetof(struct sock, sk_cookie));
323
fa76ce73 324 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
a58917f5
ED		 325 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
326 r->idiag_rqueue = 0;
327 r->idiag_wqueue = 0;
328 r->idiag_uid = 0;
329 r->idiag_inode = 0;
330
331 nlmsg_end(skb, nlh);
332 return 0;
333}
334
dff2c035 335static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
34160ea3 336 const struct inet_diag_req_v2 *r,
d06ca956 337 struct user_namespace *user_ns,
15e47304 338 u32 portid, u32 seq, u16 nlmsg_flags,
dff2c035
ACM		 339 const struct nlmsghdr *unlh)
340{
341 if (sk->sk_state == TCP_TIME_WAIT)
a58917f5 342 return inet_twsk_diag_fill(sk, skb, portid, seq,
efe4208f
ED		 343 nlmsg_flags, unlh);
344
a58917f5
ED		 345 if (sk->sk_state == TCP_NEW_SYN_RECV)
346 return inet_req_diag_fill(sk, skb, portid, seq,
347 nlmsg_flags, unlh);
348
efe4208f
ED		 349 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
350 nlmsg_flags, unlh);
dff2c035
ACM		 351}
352
b613f56e
LC		 353struct sock *inet_diag_find_one_icsk(struct net *net,
354 struct inet_hashinfo *hashinfo,
355 const struct inet_diag_req_v2 *req)
1da177e4 356{
e31c5e0e 357 struct sock *sk;
d523a328 358
e31c5e0e 359 if (req->sdiag_family == AF_INET)
51d7cccf 360 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
73c1f4a0
ACM		 361 req->id.idiag_dport, req->id.idiag_src[0],
362 req->id.idiag_sport, req->id.idiag_if);
dfd56b8b 363#if IS_ENABLED(CONFIG_IPV6)
7c130672
ED		 364 else if (req->sdiag_family == AF_INET6) {
365 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
366 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
367 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[3],
368 req->id.idiag_dport, req->id.idiag_src[3],
369 req->id.idiag_sport, req->id.idiag_if);
370 else
371 sk = inet6_lookup(net, hashinfo,
372 (struct in6_addr *)req->id.idiag_dst,
373 req->id.idiag_dport,
374 (struct in6_addr *)req->id.idiag_src,
375 req->id.idiag_sport,
376 req->id.idiag_if);
377 }
1da177e4 378#endif
e31c5e0e 379 else
b613f56e 380 return ERR_PTR(-EINVAL);
1da177e4 381
e31c5e0e 382 if (!sk)
b613f56e 383 return ERR_PTR(-ENOENT);
1da177e4 384
b613f56e
LC		 385 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
386 sock_gen_put(sk);
387 return ERR_PTR(-ENOENT);
388 }
389
390 return sk;
391}
392EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
393
394int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
395 struct sk_buff *in_skb,
396 const struct nlmsghdr *nlh,
397 const struct inet_diag_req_v2 *req)
398{
399 struct net *net = sock_net(in_skb->sk);
400 struct sk_buff *rep;
401 struct sock *sk;
402 int err;
403
404 sk = inet_diag_find_one_icsk(net, hashinfo, req);
405 if (IS_ERR(sk))
406 return PTR_ERR(sk);
1da177e4 407
c8e2c80d 408 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
6e277ed5
TG		 409 if (!rep) {
410 err = -ENOMEM;
1da177e4 411 goto out;
6e277ed5 412 }
1da177e4 413
a029fe26 414 err = sk_diag_fill(sk, rep, req,
e32123e5 415 sk_user_ns(NETLINK_CB(in_skb).sk),
15e47304 416 NETLINK_CB(in_skb).portid,
26932566
PM		 417 nlh->nlmsg_seq, 0, nlh);
418 if (err < 0) {
419 WARN_ON(err == -EMSGSIZE);
6e277ed5 420 nlmsg_free(rep);
26932566
PM		 421 goto out;
422 }
15e47304 423 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
73c1f4a0 424 MSG_DONTWAIT);
1da177e4
LT		 425 if (err > 0)
426 err = 0;
427
428out:
c1d607cc
ED		 429 if (sk)
430 sock_gen_put(sk);
431
476f7dbf
PE		 432 return err;
433}
1942c518 434EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
476f7dbf 435
6eb5d2e0 436static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
476f7dbf 437 const struct nlmsghdr *nlh,
34160ea3 438 const struct inet_diag_req_v2 *req)
476f7dbf
PE		 439{
440 const struct inet_diag_handler *handler;
441 int err;
442
443 handler = inet_diag_lock_handler(req->sdiag_protocol);
444 if (IS_ERR(handler))
445 err = PTR_ERR(handler);
6eb5d2e0 446 else if (cmd == SOCK_DIAG_BY_FAMILY)
1942c518 447 err = handler->dump_one(in_skb, nlh, req);
6eb5d2e0
LC		 448 else if (cmd == SOCK_DESTROY && handler->destroy)
449 err = handler->destroy(in_skb, req);
450 else
451 err = -EOPNOTSUPP;
d523a328 452 inet_diag_unlock_handler(handler);
476f7dbf 453
1da177e4
LT		 454 return err;
455}
456
9f855299 457static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
1da177e4
LT		 458{
459 int words = bits >> 5;
460
461 bits &= 0x1f;
462
463 if (words) {
464 if (memcmp(a1, a2, words << 2))
465 return 0;
466 }
467 if (bits) {
9f855299
AV		 468 __be32 w1, w2;
469 __be32 mask;
1da177e4
LT		 470
471 w1 = a1[words];
472 w2 = a2[words];
473
474 mask = htonl((0xffffffff) << (32 - bits));
475
476 if ((w1 ^ w2) & mask)
477 return 0;
478 }
479
480 return 1;
481}
482
87c22ea5 483static int inet_diag_bc_run(const struct nlattr *_bc,
e31c5e0e 484 const struct inet_diag_entry *entry)
1da177e4 485{
87c22ea5
PE		 486 const void *bc = nla_data(_bc);
487 int len = nla_len(_bc);
488
1da177e4
LT		 489 while (len > 0) {
490 int yes = 1;
73c1f4a0 491 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 492
493 switch (op->code) {
73c1f4a0 494 case INET_DIAG_BC_NOP:
1da177e4 495 break;
73c1f4a0 496 case INET_DIAG_BC_JMP:
1da177e4
LT		 497 yes = 0;
498 break;
73c1f4a0 499 case INET_DIAG_BC_S_GE:
1da177e4
LT		 500 yes = entry->sport >= op[1].no;
501 break;
73c1f4a0 502 case INET_DIAG_BC_S_LE:
b4ced2b7 503 yes = entry->sport <= op[1].no;
1da177e4 504 break;
73c1f4a0 505 case INET_DIAG_BC_D_GE:
1da177e4
LT		 506 yes = entry->dport >= op[1].no;
507 break;
73c1f4a0 508 case INET_DIAG_BC_D_LE:
1da177e4
LT		 509 yes = entry->dport <= op[1].no;
510 break;
73c1f4a0 511 case INET_DIAG_BC_AUTO:
1da177e4
LT		 512 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
513 break;
73c1f4a0 514 case INET_DIAG_BC_S_COND:
a8c2190e 515 case INET_DIAG_BC_D_COND: {
e31c5e0e
ED		 516 const struct inet_diag_hostcond *cond;
517 const __be32 *addr;
1da177e4 518
e31c5e0e 519 cond = (const struct inet_diag_hostcond *)(op + 1);
1da177e4 520 if (cond->port != -1 &&
73c1f4a0 521 cond->port != (op->code == INET_DIAG_BC_S_COND ?
1da177e4
LT		 522 entry->sport : entry->dport)) {
523 yes = 0;
524 break;
525 }
4e852c02 526
73c1f4a0 527 if (op->code == INET_DIAG_BC_S_COND)
1da177e4
LT		 528 addr = entry->saddr;
529 else
530 addr = entry->daddr;
531
f67caec9
NC		 532 if (cond->family != AF_UNSPEC &&
533 cond->family != entry->family) {
534 if (entry->family == AF_INET6 &&
535 cond->family == AF_INET) {
536 if (addr[0] == 0 && addr[1] == 0 &&
537 addr[2] == htonl(0xffff) &&
538 bitstring_match(addr + 3,
539 cond->addr,
540 cond->prefix_len))
541 break;
542 }
543 yes = 0;
544 break;
545 }
546
547 if (cond->prefix_len == 0)
548 break;
4e852c02
ACM		 549 if (bitstring_match(addr, cond->addr,
550 cond->prefix_len))
1da177e4 551 break;
1da177e4
LT		 552 yes = 0;
553 break;
554 }
555 }
556
4e852c02 557 if (yes) {
1da177e4
LT		 558 len -= op->yes;
559 bc += op->yes;
560 } else {
561 len -= op->no;
562 bc += op->no;
563 }
564 }
a02cec21 565 return len == 0;
1da177e4
LT		 566}
567
a4458343
ED		 568/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
569 */
570static void entry_fill_addrs(struct inet_diag_entry *entry,
571 const struct sock *sk)
572{
573#if IS_ENABLED(CONFIG_IPV6)
574 if (sk->sk_family == AF_INET6) {
575 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
576 entry->daddr = sk->sk_v6_daddr.s6_addr32;
577 } else
578#endif
579 {
580 entry->saddr = &sk->sk_rcv_saddr;
581 entry->daddr = &sk->sk_daddr;
582 }
583}
584
8d07d151
PE		 585int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
586{
8d07d151 587 struct inet_sock *inet = inet_sk(sk);
e31c5e0e 588 struct inet_diag_entry entry;
8d07d151 589
e31c5e0e 590 if (!bc)
8d07d151
PE		 591 return 1;
592
593 entry.family = sk->sk_family;
a4458343 594 entry_fill_addrs(&entry, sk);
8d07d151
PE		 595 entry.sport = inet->inet_num;
596 entry.dport = ntohs(inet->inet_dport);
a58917f5 597 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
8d07d151
PE		 598
599 return inet_diag_bc_run(bc, &entry);
600}
601EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
602
1da177e4
LT		 603static int valid_cc(const void *bc, int len, int cc)
604{
605 while (len >= 0) {
73c1f4a0 606 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 607
608 if (cc > len)
609 return 0;
610 if (cc == len)
611 return 1;
eeb14972 612 if (op->yes < 4 || op->yes & 3)
1da177e4
LT		 613 return 0;
614 len -= op->yes;
615 bc += op->yes;
616 }
617 return 0;
618}
619
405c0059
NC		 620/* Validate an inet_diag_hostcond. */
621static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
622 int *min_len)
623{
405c0059 624 struct inet_diag_hostcond *cond;
e31c5e0e 625 int addr_len;
405c0059
NC		 626
627 /* Check hostcond space. */
628 *min_len += sizeof(struct inet_diag_hostcond);
629 if (len < *min_len)
630 return false;
631 cond = (struct inet_diag_hostcond *)(op + 1);
632
633 /* Check address family and address length. */
634 switch (cond->family) {
635 case AF_UNSPEC:
636 addr_len = 0;
637 break;
638 case AF_INET:
639 addr_len = sizeof(struct in_addr);
640 break;
641 case AF_INET6:
642 addr_len = sizeof(struct in6_addr);
643 break;
644 default:
645 return false;
646 }
647 *min_len += addr_len;
648 if (len < *min_len)
649 return false;
650
651 /* Check prefix length (in bits) vs address length (in bytes). */
652 if (cond->prefix_len > 8 * addr_len)
653 return false;
654
655 return true;
656}
657
5e1f5420 658/* Validate a port comparison operator. */
e31c5e0e
ED		 659static bool valid_port_comparison(const struct inet_diag_bc_op *op,
660 int len, int *min_len)
5e1f5420
NC		 661{
662 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
663 *min_len += sizeof(struct inet_diag_bc_op);
664 if (len < *min_len)
665 return false;
666 return true;
667}
668
73c1f4a0 669static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
1da177e4 670{
eeb14972 671 const void *bc = bytecode;
1da177e4
LT		 672 int len = bytecode_len;
673
674 while (len > 0) {
405c0059 675 int min_len = sizeof(struct inet_diag_bc_op);
e31c5e0e 676 const struct inet_diag_bc_op *op = bc;
1da177e4 677
1da177e4 678 switch (op->code) {
73c1f4a0
ACM		 679 case INET_DIAG_BC_S_COND:
680 case INET_DIAG_BC_D_COND:
405c0059
NC		 681 if (!valid_hostcond(bc, len, &min_len))
682 return -EINVAL;
5e1f5420 683 break;
73c1f4a0
ACM		 684 case INET_DIAG_BC_S_GE:
685 case INET_DIAG_BC_S_LE:
686 case INET_DIAG_BC_D_GE:
687 case INET_DIAG_BC_D_LE:
5e1f5420 688 if (!valid_port_comparison(bc, len, &min_len))
1da177e4
LT		 689 return -EINVAL;
690 break;
5e1f5420
NC		 691 case INET_DIAG_BC_AUTO:
692 case INET_DIAG_BC_JMP:
73c1f4a0 693 case INET_DIAG_BC_NOP:
1da177e4
LT		 694 break;
695 default:
696 return -EINVAL;
697 }
5e1f5420
NC		 698
699 if (op->code != INET_DIAG_BC_NOP) {
700 if (op->no < min_len || op->no > len + 4 || op->no & 3)
701 return -EINVAL;
702 if (op->no < len &&
703 !valid_cc(bytecode, bytecode_len, len - op->no))
704 return -EINVAL;
705 }
706
405c0059 707 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
eeb14972 708 return -EINVAL;
4e852c02 709 bc += op->yes;
1da177e4
LT		 710 len -= op->yes;
711 }
712 return len == 0 ? 0 : -EINVAL;
713}
714
dff2c035
ACM		 715static int inet_csk_diag_dump(struct sock *sk,
716 struct sk_buff *skb,
37f352b5 717 struct netlink_callback *cb,
34160ea3 718 const struct inet_diag_req_v2 *r,
37f352b5 719 const struct nlattr *bc)
1da177e4 720{
8d07d151
PE		 721 if (!inet_diag_bc_sk(bc, sk))
722 return 0;
1da177e4 723
a029fe26 724 return inet_csk_diag_fill(sk, skb, r,
e32123e5 725 sk_user_ns(NETLINK_CB(cb->skb).sk),
15e47304 726 NETLINK_CB(cb->skb).portid,
dff2c035 727 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
1da177e4
LT		 728}
729
49612729
ED		 730static void twsk_build_assert(void)
731{
732 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
733 offsetof(struct sock, sk_family));
734
735 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
736 offsetof(struct inet_sock, inet_num));
737
738 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
739 offsetof(struct inet_sock, inet_dport));
740
741 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
742 offsetof(struct inet_sock, inet_rcv_saddr));
743
744 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
745 offsetof(struct inet_sock, inet_daddr));
746
747#if IS_ENABLED(CONFIG_IPV6)
748 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
749 offsetof(struct sock, sk_v6_rcv_saddr));
750
751 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
752 offsetof(struct sock, sk_v6_daddr));
753#endif
754}
755
1942c518 756void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
e31c5e0e 757 struct netlink_callback *cb,
34160ea3 758 const struct inet_diag_req_v2 *r, struct nlattr *bc)
1da177e4 759{
51d7cccf 760 struct net *net = sock_net(skb->sk);
e31c5e0e 761 int i, num, s_i, s_num;
079096f1 762 u32 idiag_states = r->idiag_states;
4e852c02 763
079096f1
ED		 764 if (idiag_states & TCPF_SYN_RECV)
765 idiag_states |= TCPF_NEW_SYN_RECV;
1da177e4
LT		 766 s_i = cb->args[1];
767 s_num = num = cb->args[2];
4f5736c4 768
1da177e4 769 if (cb->args[0] == 0) {
079096f1 770 if (!(idiag_states & TCPF_LISTEN))
1da177e4 771 goto skip_listen_ht;
540722ff 772
0f7ff927 773 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
5caea4ea 774 struct inet_listen_hashbucket *ilb;
e31c5e0e
ED		 775 struct hlist_nulls_node *node;
776 struct sock *sk;
1da177e4
LT		 777
778 num = 0;
5caea4ea
ED		 779 ilb = &hashinfo->listening_hash[i];
780 spin_lock_bh(&ilb->lock);
c25eb3bf 781 sk_nulls_for_each(sk, node, &ilb->head) {
1da177e4
LT		 782 struct inet_sock *inet = inet_sk(sk);
783
51d7cccf
AV		 784 if (!net_eq(sock_net(sk), net))
785 continue;
786
1da177e4
LT		 787 if (num < s_num) {
788 num++;
789 continue;
790 }
791
d23deaa0 792 if (r->sdiag_family != AF_UNSPEC &&
e31c5e0e 793 sk->sk_family != r->sdiag_family)
d23deaa0
PE		 794 goto next_listen;
795
c720c7e8 796 if (r->id.idiag_sport != inet->inet_sport &&
73c1f4a0 797 r->id.idiag_sport)
1da177e4
LT		 798 goto next_listen;
799
079096f1 800 if (r->id.idiag_dport ||
1da177e4 801 cb->args[3] > 0)
1da177e4
LT		 802 goto next_listen;
803
079096f1 804 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
5caea4ea 805 spin_unlock_bh(&ilb->lock);
1da177e4
LT		 806 goto done;
807 }
808
809next_listen:
810 cb->args[3] = 0;
811 cb->args[4] = 0;
812 ++num;
813 }
5caea4ea 814 spin_unlock_bh(&ilb->lock);
1da177e4
LT		 815
816 s_num = 0;
817 cb->args[3] = 0;
818 cb->args[4] = 0;
819 }
1da177e4
LT		 820skip_listen_ht:
821 cb->args[0] = 1;
822 s_i = num = s_num = 0;
823 }
824
079096f1 825 if (!(idiag_states & ~TCPF_LISTEN))
efb3cb42 826 goto out;
1da177e4 827
f373b53b 828 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
540722ff 829 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
7e3aab4a 830 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
3ab5aee7 831 struct hlist_nulls_node *node;
e31c5e0e 832 struct sock *sk;
1da177e4 833
6be547a6
AK		 834 num = 0;
835
05dbc7b5 836 if (hlist_nulls_empty(&head->chain))
6be547a6
AK		 837 continue;
838
1da177e4
LT		 839 if (i > s_i)
840 s_num = 0;
841
7e3aab4a 842 spin_lock_bh(lock);
3ab5aee7 843 sk_nulls_for_each(sk, node, &head->chain) {
e31c5e0e 844 int state, res;
1da177e4 845
51d7cccf
AV		 846 if (!net_eq(sock_net(sk), net))
847 continue;
1da177e4
LT		 848 if (num < s_num)
849 goto next_normal;
70315d22
NC		 850 state = (sk->sk_state == TCP_TIME_WAIT) ?
851 inet_twsk(sk)->tw_substate : sk->sk_state;
079096f1 852 if (!(idiag_states & (1 << state)))
1da177e4 853 goto next_normal;
d23deaa0 854 if (r->sdiag_family != AF_UNSPEC &&
05dbc7b5 855 sk->sk_family != r->sdiag_family)
d23deaa0 856 goto next_normal;
05dbc7b5 857 if (r->id.idiag_sport != htons(sk->sk_num) &&
73c1f4a0 858 r->id.idiag_sport)
1da177e4 859 goto next_normal;
05dbc7b5 860 if (r->id.idiag_dport != sk->sk_dport &&
4e852c02 861 r->id.idiag_dport)
1da177e4 862 goto next_normal;
a58917f5
ED		 863 twsk_build_assert();
864
865 if (!inet_diag_bc_sk(bc, sk))
866 goto next_normal;
867
868 res = sk_diag_fill(sk, skb, r,
869 sk_user_ns(NETLINK_CB(cb->skb).sk),
870 NETLINK_CB(cb->skb).portid,
871 cb->nlh->nlmsg_seq, NLM_F_MULTI,
872 cb->nlh);
05dbc7b5 873 if (res < 0) {
7e3aab4a 874 spin_unlock_bh(lock);
1da177e4
LT		 875 goto done;
876 }
877next_normal:
878 ++num;
879 }
880
7e3aab4a 881 spin_unlock_bh(lock);
1da177e4
LT		 882 }
883
884done:
885 cb->args[1] = i;
886 cb->args[2] = num;
efb3cb42
PE		 887out:
888 ;
889}
1942c518 890EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
efb3cb42
PE		 891
892static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
34160ea3 893 const struct inet_diag_req_v2 *r,
e31c5e0e 894 struct nlattr *bc)
efb3cb42
PE		 895{
896 const struct inet_diag_handler *handler;
cacb6ba0 897 int err = 0;
efb3cb42
PE		 898
899 handler = inet_diag_lock_handler(r->sdiag_protocol);
900 if (!IS_ERR(handler))
1942c518 901 handler->dump(skb, cb, r, bc);
cacb6ba0
CG		 902 else
903 err = PTR_ERR(handler);
d523a328 904 inet_diag_unlock_handler(handler);
efb3cb42 905
cacb6ba0 906 return err ? : skb->len;
1da177e4
LT		 907}
908
25c4cd2b
PE		 909static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
910{
c8991362 911 int hdrlen = sizeof(struct inet_diag_req_v2);
e31c5e0e 912 struct nlattr *bc = NULL;
25c4cd2b
PE		 913
914 if (nlmsg_attrlen(cb->nlh, hdrlen))
915 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
916
d106352d 917 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
25c4cd2b
PE		 918}
919
e31c5e0e 920static int inet_diag_type2proto(int type)
a029fe26
PE		 921{
922 switch (type) {
923 case TCPDIAG_GETSOCK:
924 return IPPROTO_TCP;
925 case DCCPDIAG_GETSOCK:
926 return IPPROTO_DCCP;
927 default:
928 return 0;
929 }
930}
931
e31c5e0e
ED		 932static int inet_diag_dump_compat(struct sk_buff *skb,
933 struct netlink_callback *cb)
25c4cd2b 934{
d106352d 935 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
e31c5e0e 936 int hdrlen = sizeof(struct inet_diag_req);
c8991362 937 struct inet_diag_req_v2 req;
25c4cd2b 938 struct nlattr *bc = NULL;
25c4cd2b 939
d23deaa0 940 req.sdiag_family = AF_UNSPEC; /* compatibility */
25c4cd2b
PE		 941 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
942 req.idiag_ext = rc->idiag_ext;
943 req.idiag_states = rc->idiag_states;
944 req.id = rc->id;
945
946 if (nlmsg_attrlen(cb->nlh, hdrlen))
947 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
948
949 return __inet_diag_dump(skb, cb, &req, bc);
950}
951
fe50ce28 952static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
e31c5e0e 953 const struct nlmsghdr *nlh)
fe50ce28 954{
d106352d 955 struct inet_diag_req *rc = nlmsg_data(nlh);
c8991362 956 struct inet_diag_req_v2 req;
fe50ce28
PE		 957
958 req.sdiag_family = rc->idiag_family;
959 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
960 req.idiag_ext = rc->idiag_ext;
961 req.idiag_states = rc->idiag_states;
962 req.id = rc->id;
963
6eb5d2e0 964 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
fe50ce28
PE		 965}
966
8d34172d 967static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 968{
3b09c84c 969 int hdrlen = sizeof(struct inet_diag_req);
51d7cccf 970 struct net *net = sock_net(skb->sk);
1da177e4 971
ead592ba
TG		 972 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
973 nlmsg_len(nlh) < hdrlen)
974 return -EINVAL;
1da177e4 975
b8f3ab42 976 if (nlh->nlmsg_flags & NLM_F_DUMP) {
ead592ba
TG		 977 if (nlmsg_attrlen(nlh, hdrlen)) {
978 struct nlattr *attr;
1da177e4 979
ead592ba
TG		 980 attr = nlmsg_find_attr(nlh, hdrlen,
981 INET_DIAG_REQ_BYTECODE);
e31c5e0e 982 if (!attr ||
ead592ba
TG		 983 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
984 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
985 return -EINVAL;
986 }
80d326fa
PNA		 987 {
988 struct netlink_dump_control c = {
989 .dump = inet_diag_dump_compat,
990 };
51d7cccf 991 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
80d326fa 992 }
1da177e4 993 }
ead592ba 994
fe50ce28 995 return inet_diag_get_exact_compat(skb, nlh);
1da177e4
LT		 996}
997
6eb5d2e0 998static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
d366477a 999{
c8991362 1000 int hdrlen = sizeof(struct inet_diag_req_v2);
51d7cccf 1001 struct net *net = sock_net(skb->sk);
d366477a
PE		 1002
1003 if (nlmsg_len(h) < hdrlen)
1004 return -EINVAL;
1005
6eb5d2e0
LC		 1006 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1007 h->nlmsg_flags & NLM_F_DUMP) {
25c4cd2b
PE		 1008 if (nlmsg_attrlen(h, hdrlen)) {
1009 struct nlattr *attr;
e31c5e0e 1010
25c4cd2b
PE		 1011 attr = nlmsg_find_attr(h, hdrlen,
1012 INET_DIAG_REQ_BYTECODE);
e31c5e0e 1013 if (!attr ||
25c4cd2b
PE		 1014 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1015 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1016 return -EINVAL;
1017 }
80d326fa
PNA		 1018 {
1019 struct netlink_dump_control c = {
1020 .dump = inet_diag_dump,
1021 };
51d7cccf 1022 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
80d326fa 1023 }
d366477a
PE		 1024 }
1025
6eb5d2e0 1026 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
d366477a
PE		 1027}
1028
35ac838a
CG		 1029static
1030int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1031{
1032 const struct inet_diag_handler *handler;
1033 struct nlmsghdr *nlh;
1034 struct nlattr *attr;
1035 struct inet_diag_msg *r;
1036 void *info = NULL;
1037 int err = 0;
1038
1039 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1040 if (!nlh)
1041 return -ENOMEM;
1042
1043 r = nlmsg_data(nlh);
1044 memset(r, 0, sizeof(*r));
1045 inet_diag_msg_common_fill(r, sk);
e0df02e0
CG		 1046 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1047 r->id.idiag_sport = inet_sk(sk)->inet_sport;
35ac838a
CG		 1048 r->idiag_state = sk->sk_state;
1049
1050 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1051 nlmsg_cancel(skb, nlh);
1052 return err;
1053 }
1054
1055 handler = inet_diag_lock_handler(sk->sk_protocol);
1056 if (IS_ERR(handler)) {
1057 inet_diag_unlock_handler(handler);
1058 nlmsg_cancel(skb, nlh);
1059 return PTR_ERR(handler);
1060 }
1061
1062 attr = handler->idiag_info_size
1063 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1064 : NULL;
1065 if (attr)
1066 info = nla_data(attr);
1067
1068 handler->idiag_get_info(sk, r, info);
1069 inet_diag_unlock_handler(handler);
1070
1071 nlmsg_end(skb, nlh);
1072 return 0;
1073}
1074
8dcf01fc 1075static const struct sock_diag_handler inet_diag_handler = {
d366477a 1076 .family = AF_INET,
6eb5d2e0 1077 .dump = inet_diag_handler_cmd,
35ac838a 1078 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1079 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1080};
1081
8dcf01fc 1082static const struct sock_diag_handler inet6_diag_handler = {
d366477a 1083 .family = AF_INET6,
6eb5d2e0 1084 .dump = inet_diag_handler_cmd,
35ac838a 1085 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1086 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1087};
1088
4f5736c4
ACM		 1089int inet_diag_register(const struct inet_diag_handler *h)
1090{
1091 const __u16 type = h->idiag_type;
1092 int err = -EINVAL;
1093
f13c95f0 1094 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1095 goto out;
1096
d523a328 1097 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1098 err = -EEXIST;
e31c5e0e 1099 if (!inet_diag_table[type]) {
4f5736c4
ACM		 1100 inet_diag_table[type] = h;
1101 err = 0;
1102 }
d523a328 1103 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1104out:
1105 return err;
1106}
1107EXPORT_SYMBOL_GPL(inet_diag_register);
1108
1109void inet_diag_unregister(const struct inet_diag_handler *h)
1110{
1111 const __u16 type = h->idiag_type;
1112
f13c95f0 1113 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1114 return;
1115
d523a328 1116 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1117 inet_diag_table[type] = NULL;
d523a328 1118 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1119}
1120EXPORT_SYMBOL_GPL(inet_diag_unregister);
1121
73c1f4a0 1122static int __init inet_diag_init(void)
1da177e4 1123{
f13c95f0 1124 const int inet_diag_table_size = (IPPROTO_MAX *
4f5736c4
ACM		 1125 sizeof(struct inet_diag_handler *));
1126 int err = -ENOMEM;
1127
0da974f4 1128 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
4f5736c4
ACM		 1129 if (!inet_diag_table)
1130 goto out;
1131
d366477a
PE		 1132 err = sock_diag_register(&inet_diag_handler);
1133 if (err)
1134 goto out_free_nl;
1135
1136 err = sock_diag_register(&inet6_diag_handler);
1137 if (err)
1138 goto out_free_inet;
1139
8ef874bf 1140 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4
ACM		 1141out:
1142 return err;
d366477a
PE		 1143
1144out_free_inet:
1145 sock_diag_unregister(&inet_diag_handler);
1146out_free_nl:
4f5736c4
ACM		 1147 kfree(inet_diag_table);
1148 goto out;
1da177e4
LT		 1149}
1150
73c1f4a0 1151static void __exit inet_diag_exit(void)
1da177e4 1152{
d366477a
PE		 1153 sock_diag_unregister(&inet6_diag_handler);
1154 sock_diag_unregister(&inet_diag_handler);
8ef874bf 1155 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4 1156 kfree(inet_diag_table);
1da177e4
LT		 1157}
1158
73c1f4a0
ACM		 1159module_init(inet_diag_init);
1160module_exit(inet_diag_exit);
1da177e4 1161MODULE_LICENSE("GPL");
aec8dc62
PE		 1162MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1163MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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