projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
perf, bpf: minimize the size of perf_trace_() tracepoint handler
[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
cb2050a7 69void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
a4458343
ED		 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}
cb2050a7 92EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
a4458343 93
c8e2c80d
ED		 94static size_t inet_sk_attr_size(void)
95{
96 return nla_total_size(sizeof(struct tcp_info))
97 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
98 + nla_total_size(1) /* INET_DIAG_TOS */
99 + nla_total_size(1) /* INET_DIAG_TCLASS */
100 + nla_total_size(sizeof(struct inet_diag_meminfo))
101 + nla_total_size(sizeof(struct inet_diag_msg))
102 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
103 + nla_total_size(TCP_CA_NAME_MAX)
104 + nla_total_size(sizeof(struct tcpvegas_info))
105 + 64;
106}
107
cb2050a7
XL		 108int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
109 struct inet_diag_msg *r, int ext,
110 struct user_namespace *user_ns)
111{
112 const struct inet_sock *inet = inet_sk(sk);
113
114 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
115 goto errout;
116
117 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
118 * hence this needs to be included regardless of socket family.
119 */
120 if (ext & (1 << (INET_DIAG_TOS - 1)))
121 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
122 goto errout;
123
124#if IS_ENABLED(CONFIG_IPV6)
125 if (r->idiag_family == AF_INET6) {
126 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
127 if (nla_put_u8(skb, INET_DIAG_TCLASS,
128 inet6_sk(sk)->tclass) < 0)
129 goto errout;
130
131 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
132 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
133 goto errout;
134 }
135#endif
136
137 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
138 r->idiag_inode = sock_i_ino(sk);
139
140 return 0;
141errout:
142 return 1;
143}
144EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
145
3c4d05c8 146int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
34160ea3 147 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
e31c5e0e
ED		 148 struct user_namespace *user_ns,
149 u32 portid, u32 seq, u16 nlmsg_flags,
150 const struct nlmsghdr *unlh)
1da177e4 151{
521f1cf1 152 const struct tcp_congestion_ops *ca_ops;
e31c5e0e
ED		 153 const struct inet_diag_handler *handler;
154 int ext = req->idiag_ext;
73c1f4a0 155 struct inet_diag_msg *r;
1da177e4 156 struct nlmsghdr *nlh;
6e277ed5 157 struct nlattr *attr;
4f5736c4 158 void *info = NULL;
4f5736c4 159
a029fe26 160 handler = inet_diag_table[req->sdiag_protocol];
e31c5e0e 161 BUG_ON(!handler);
1da177e4 162
15e47304 163 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 164 nlmsg_flags);
165 if (!nlh)
d106352d 166 return -EMSGSIZE;
4f5736c4 167
d106352d 168 r = nlmsg_data(nlh);
a58917f5 169 BUG_ON(!sk_fullsock(sk));
c7d58aab 170
a4458343 171 inet_diag_msg_common_fill(r, sk);
73c1f4a0
ACM		 172 r->idiag_state = sk->sk_state;
173 r->idiag_timer = 0;
174 r->idiag_retrans = 0;
1da177e4 175
cb2050a7 176 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
e4e541a8
PE		 177 goto errout;
178
6e277ed5
TG		 179 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
180 struct inet_diag_meminfo minfo = {
181 .idiag_rmem = sk_rmem_alloc_get(sk),
182 .idiag_wmem = sk->sk_wmem_queued,
183 .idiag_fmem = sk->sk_forward_alloc,
184 .idiag_tmem = sk_wmem_alloc_get(sk),
185 };
186
187 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
188 goto errout;
3c4d05c8
PE		 189 }
190
c0636faa
PE		 191 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
192 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
6e277ed5 193 goto errout;
c0636faa 194
e31c5e0e 195 if (!icsk) {
62ad6fcd 196 handler->idiag_get_info(sk, r, NULL);
3c4d05c8
PE		 197 goto out;
198 }
199
172589cc 200#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
1da177e4 201
6ba8a3b1
ND		 202 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
203 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
204 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
73c1f4a0
ACM		 205 r->idiag_timer = 1;
206 r->idiag_retrans = icsk->icsk_retransmits;
207 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
463c84b9 208 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
73c1f4a0
ACM		 209 r->idiag_timer = 4;
210 r->idiag_retrans = icsk->icsk_probes_out;
211 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
1da177e4 212 } else if (timer_pending(&sk->sk_timer)) {
73c1f4a0
ACM		 213 r->idiag_timer = 2;
214 r->idiag_retrans = icsk->icsk_probes_out;
215 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
1da177e4 216 } else {
73c1f4a0
ACM		 217 r->idiag_timer = 0;
218 r->idiag_expires = 0;
1da177e4
LT		 219 }
220#undef EXPIRES_IN_MS
540722ff 221
3fd22af8 222 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
6e277ed5 223 attr = nla_reserve(skb, INET_DIAG_INFO,
3fd22af8 224 handler->idiag_info_size);
6e277ed5
TG		 225 if (!attr)
226 goto errout;
3c4d05c8 227
6e277ed5 228 info = nla_data(attr);
1da177e4
LT		 229 }
230
521f1cf1
ED		 231 if (ext & (1 << (INET_DIAG_CONG - 1))) {
232 int err = 0;
233
234 rcu_read_lock();
235 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
236 if (ca_ops)
237 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
238 rcu_read_unlock();
239 if (err < 0)
6e277ed5 240 goto errout;
521f1cf1 241 }
6e277ed5 242
4f5736c4 243 handler->idiag_get_info(sk, r, info);
1da177e4 244
521f1cf1 245 if (sk->sk_state < TCP_TIME_WAIT) {
64f40ff5
ED		 246 union tcp_cc_info info;
247 size_t sz = 0;
248 int attr;
521f1cf1
ED		 249
250 rcu_read_lock();
251 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
252 if (ca_ops && ca_ops->get_info)
64f40ff5 253 sz = ca_ops->get_info(sk, ext, &attr, &info);
521f1cf1 254 rcu_read_unlock();
64f40ff5 255 if (sz && nla_put(skb, attr, sz, &info) < 0)
521f1cf1
ED		 256 goto errout;
257 }
1da177e4 258
3c4d05c8 259out:
053c095a
JB		 260 nlmsg_end(skb, nlh);
261 return 0;
1da177e4 262
6e277ed5
TG		 263errout:
264 nlmsg_cancel(skb, nlh);
26932566 265 return -EMSGSIZE;
1da177e4 266}
3c4d05c8
PE		 267EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
268
269static int inet_csk_diag_fill(struct sock *sk,
e31c5e0e 270 struct sk_buff *skb,
34160ea3 271 const struct inet_diag_req_v2 *req,
d06ca956 272 struct user_namespace *user_ns,
15e47304 273 u32 portid, u32 seq, u16 nlmsg_flags,
3c4d05c8
PE		 274 const struct nlmsghdr *unlh)
275{
e31c5e0e
ED		 276 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
277 user_ns, portid, seq, nlmsg_flags, unlh);
3c4d05c8 278}
1da177e4 279
33cf7c90 280static int inet_twsk_diag_fill(struct sock *sk,
e31c5e0e 281 struct sk_buff *skb,
15e47304 282 u32 portid, u32 seq, u16 nlmsg_flags,
c7d58aab
ACM		 283 const struct nlmsghdr *unlh)
284{
33cf7c90 285 struct inet_timewait_sock *tw = inet_twsk(sk);
c7d58aab 286 struct inet_diag_msg *r;
6e277ed5 287 struct nlmsghdr *nlh;
789f558c 288 long tmo;
d106352d 289
15e47304 290 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 291 nlmsg_flags);
292 if (!nlh)
d106352d 293 return -EMSGSIZE;
c7d58aab 294
d106352d 295 r = nlmsg_data(nlh);
c7d58aab
ACM		 296 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
297
789f558c 298 tmo = tw->tw_timer.expires - jiffies;
c7d58aab
ACM		 299 if (tmo < 0)
300 tmo = 0;
301
a4458343 302 inet_diag_msg_common_fill(r, sk);
c7d58aab 303 r->idiag_retrans = 0;
b1aac815 304
c7d58aab
ACM		 305 r->idiag_state = tw->tw_substate;
306 r->idiag_timer = 3;
96f817fe 307 r->idiag_expires = jiffies_to_msecs(tmo);
c7d58aab
ACM		 308 r->idiag_rqueue = 0;
309 r->idiag_wqueue = 0;
310 r->idiag_uid = 0;
311 r->idiag_inode = 0;
6e277ed5 312
053c095a
JB		 313 nlmsg_end(skb, nlh);
314 return 0;
c7d58aab
ACM		 315}
316
a58917f5
ED		 317static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
318 u32 portid, u32 seq, u16 nlmsg_flags,
319 const struct nlmsghdr *unlh)
320{
321 struct inet_diag_msg *r;
322 struct nlmsghdr *nlh;
323 long tmo;
324
325 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
326 nlmsg_flags);
327 if (!nlh)
328 return -EMSGSIZE;
329
330 r = nlmsg_data(nlh);
331 inet_diag_msg_common_fill(r, sk);
332 r->idiag_state = TCP_SYN_RECV;
333 r->idiag_timer = 1;
334 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
335
336 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
337 offsetof(struct sock, sk_cookie));
338
fa76ce73 339 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
a58917f5
ED		 340 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
341 r->idiag_rqueue = 0;
342 r->idiag_wqueue = 0;
343 r->idiag_uid = 0;
344 r->idiag_inode = 0;
345
346 nlmsg_end(skb, nlh);
347 return 0;
348}
349
dff2c035 350static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
34160ea3 351 const struct inet_diag_req_v2 *r,
d06ca956 352 struct user_namespace *user_ns,
15e47304 353 u32 portid, u32 seq, u16 nlmsg_flags,
dff2c035
ACM		 354 const struct nlmsghdr *unlh)
355{
356 if (sk->sk_state == TCP_TIME_WAIT)
a58917f5 357 return inet_twsk_diag_fill(sk, skb, portid, seq,
efe4208f
ED		 358 nlmsg_flags, unlh);
359
a58917f5
ED		 360 if (sk->sk_state == TCP_NEW_SYN_RECV)
361 return inet_req_diag_fill(sk, skb, portid, seq,
362 nlmsg_flags, unlh);
363
efe4208f
ED		 364 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
365 nlmsg_flags, unlh);
dff2c035
ACM		 366}
367
b613f56e
LC		 368struct sock *inet_diag_find_one_icsk(struct net *net,
369 struct inet_hashinfo *hashinfo,
370 const struct inet_diag_req_v2 *req)
1da177e4 371{
e31c5e0e 372 struct sock *sk;
d523a328 373
2d331915 374 rcu_read_lock();
e31c5e0e 375 if (req->sdiag_family == AF_INET)
a583636a 376 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
73c1f4a0
ACM		 377 req->id.idiag_dport, req->id.idiag_src[0],
378 req->id.idiag_sport, req->id.idiag_if);
dfd56b8b 379#if IS_ENABLED(CONFIG_IPV6)
7c130672
ED		 380 else if (req->sdiag_family == AF_INET6) {
381 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
382 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
a583636a 383 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
7c130672
ED		 384 req->id.idiag_dport, req->id.idiag_src[3],
385 req->id.idiag_sport, req->id.idiag_if);
386 else
a583636a 387 sk = inet6_lookup(net, hashinfo, NULL, 0,
7c130672
ED		 388 (struct in6_addr *)req->id.idiag_dst,
389 req->id.idiag_dport,
390 (struct in6_addr *)req->id.idiag_src,
391 req->id.idiag_sport,
392 req->id.idiag_if);
393 }
1da177e4 394#endif
2d331915
ED		 395 else {
396 rcu_read_unlock();
b613f56e 397 return ERR_PTR(-EINVAL);
2d331915
ED		 398 }
399 rcu_read_unlock();
e31c5e0e 400 if (!sk)
b613f56e 401 return ERR_PTR(-ENOENT);
1da177e4 402
b613f56e
LC		 403 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
404 sock_gen_put(sk);
405 return ERR_PTR(-ENOENT);
406 }
407
408 return sk;
409}
410EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
411
412int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
413 struct sk_buff *in_skb,
414 const struct nlmsghdr *nlh,
415 const struct inet_diag_req_v2 *req)
416{
417 struct net *net = sock_net(in_skb->sk);
418 struct sk_buff *rep;
419 struct sock *sk;
420 int err;
421
422 sk = inet_diag_find_one_icsk(net, hashinfo, req);
423 if (IS_ERR(sk))
424 return PTR_ERR(sk);
1da177e4 425
c8e2c80d 426 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
6e277ed5
TG		 427 if (!rep) {
428 err = -ENOMEM;
1da177e4 429 goto out;
6e277ed5 430 }
1da177e4 431
a029fe26 432 err = sk_diag_fill(sk, rep, req,
e32123e5 433 sk_user_ns(NETLINK_CB(in_skb).sk),
15e47304 434 NETLINK_CB(in_skb).portid,
26932566
PM		 435 nlh->nlmsg_seq, 0, nlh);
436 if (err < 0) {
437 WARN_ON(err == -EMSGSIZE);
6e277ed5 438 nlmsg_free(rep);
26932566
PM		 439 goto out;
440 }
15e47304 441 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
73c1f4a0 442 MSG_DONTWAIT);
1da177e4
LT		 443 if (err > 0)
444 err = 0;
445
446out:
c1d607cc
ED		 447 if (sk)
448 sock_gen_put(sk);
449
476f7dbf
PE		 450 return err;
451}
1942c518 452EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
476f7dbf 453
6eb5d2e0 454static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
476f7dbf 455 const struct nlmsghdr *nlh,
34160ea3 456 const struct inet_diag_req_v2 *req)
476f7dbf
PE		 457{
458 const struct inet_diag_handler *handler;
459 int err;
460
461 handler = inet_diag_lock_handler(req->sdiag_protocol);
462 if (IS_ERR(handler))
463 err = PTR_ERR(handler);
6eb5d2e0 464 else if (cmd == SOCK_DIAG_BY_FAMILY)
1942c518 465 err = handler->dump_one(in_skb, nlh, req);
6eb5d2e0
LC		 466 else if (cmd == SOCK_DESTROY && handler->destroy)
467 err = handler->destroy(in_skb, req);
468 else
469 err = -EOPNOTSUPP;
d523a328 470 inet_diag_unlock_handler(handler);
476f7dbf 471
1da177e4
LT		 472 return err;
473}
474
9f855299 475static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
1da177e4
LT		 476{
477 int words = bits >> 5;
478
479 bits &= 0x1f;
480
481 if (words) {
482 if (memcmp(a1, a2, words << 2))
483 return 0;
484 }
485 if (bits) {
9f855299
AV		 486 __be32 w1, w2;
487 __be32 mask;
1da177e4
LT		 488
489 w1 = a1[words];
490 w2 = a2[words];
491
492 mask = htonl((0xffffffff) << (32 - bits));
493
494 if ((w1 ^ w2) & mask)
495 return 0;
496 }
497
498 return 1;
499}
500
87c22ea5 501static int inet_diag_bc_run(const struct nlattr *_bc,
e31c5e0e 502 const struct inet_diag_entry *entry)
1da177e4 503{
87c22ea5
PE		 504 const void *bc = nla_data(_bc);
505 int len = nla_len(_bc);
506
1da177e4
LT		 507 while (len > 0) {
508 int yes = 1;
73c1f4a0 509 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 510
511 switch (op->code) {
73c1f4a0 512 case INET_DIAG_BC_NOP:
1da177e4 513 break;
73c1f4a0 514 case INET_DIAG_BC_JMP:
1da177e4
LT		 515 yes = 0;
516 break;
73c1f4a0 517 case INET_DIAG_BC_S_GE:
1da177e4
LT		 518 yes = entry->sport >= op[1].no;
519 break;
73c1f4a0 520 case INET_DIAG_BC_S_LE:
b4ced2b7 521 yes = entry->sport <= op[1].no;
1da177e4 522 break;
73c1f4a0 523 case INET_DIAG_BC_D_GE:
1da177e4
LT		 524 yes = entry->dport >= op[1].no;
525 break;
73c1f4a0 526 case INET_DIAG_BC_D_LE:
1da177e4
LT		 527 yes = entry->dport <= op[1].no;
528 break;
73c1f4a0 529 case INET_DIAG_BC_AUTO:
1da177e4
LT		 530 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
531 break;
73c1f4a0 532 case INET_DIAG_BC_S_COND:
a8c2190e 533 case INET_DIAG_BC_D_COND: {
e31c5e0e
ED		 534 const struct inet_diag_hostcond *cond;
535 const __be32 *addr;
1da177e4 536
e31c5e0e 537 cond = (const struct inet_diag_hostcond *)(op + 1);
1da177e4 538 if (cond->port != -1 &&
73c1f4a0 539 cond->port != (op->code == INET_DIAG_BC_S_COND ?
1da177e4
LT		 540 entry->sport : entry->dport)) {
541 yes = 0;
542 break;
543 }
4e852c02 544
73c1f4a0 545 if (op->code == INET_DIAG_BC_S_COND)
1da177e4
LT		 546 addr = entry->saddr;
547 else
548 addr = entry->daddr;
549
f67caec9
NC		 550 if (cond->family != AF_UNSPEC &&
551 cond->family != entry->family) {
552 if (entry->family == AF_INET6 &&
553 cond->family == AF_INET) {
554 if (addr[0] == 0 && addr[1] == 0 &&
555 addr[2] == htonl(0xffff) &&
556 bitstring_match(addr + 3,
557 cond->addr,
558 cond->prefix_len))
559 break;
560 }
561 yes = 0;
562 break;
563 }
564
565 if (cond->prefix_len == 0)
566 break;
4e852c02
ACM		 567 if (bitstring_match(addr, cond->addr,
568 cond->prefix_len))
1da177e4 569 break;
1da177e4
LT		 570 yes = 0;
571 break;
572 }
573 }
574
4e852c02 575 if (yes) {
1da177e4
LT		 576 len -= op->yes;
577 bc += op->yes;
578 } else {
579 len -= op->no;
580 bc += op->no;
581 }
582 }
a02cec21 583 return len == 0;
1da177e4
LT		 584}
585
a4458343
ED		 586/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
587 */
588static void entry_fill_addrs(struct inet_diag_entry *entry,
589 const struct sock *sk)
590{
591#if IS_ENABLED(CONFIG_IPV6)
592 if (sk->sk_family == AF_INET6) {
593 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
594 entry->daddr = sk->sk_v6_daddr.s6_addr32;
595 } else
596#endif
597 {
598 entry->saddr = &sk->sk_rcv_saddr;
599 entry->daddr = &sk->sk_daddr;
600 }
601}
602
8d07d151
PE		 603int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
604{
8d07d151 605 struct inet_sock *inet = inet_sk(sk);
e31c5e0e 606 struct inet_diag_entry entry;
8d07d151 607
e31c5e0e 608 if (!bc)
8d07d151
PE		 609 return 1;
610
611 entry.family = sk->sk_family;
a4458343 612 entry_fill_addrs(&entry, sk);
8d07d151
PE		 613 entry.sport = inet->inet_num;
614 entry.dport = ntohs(inet->inet_dport);
a58917f5 615 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
8d07d151
PE		 616
617 return inet_diag_bc_run(bc, &entry);
618}
619EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
620
1da177e4
LT		 621static int valid_cc(const void *bc, int len, int cc)
622{
623 while (len >= 0) {
73c1f4a0 624 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 625
626 if (cc > len)
627 return 0;
628 if (cc == len)
629 return 1;
eeb14972 630 if (op->yes < 4 || op->yes & 3)
1da177e4
LT		 631 return 0;
632 len -= op->yes;
633 bc += op->yes;
634 }
635 return 0;
636}
637
405c0059
NC		 638/* Validate an inet_diag_hostcond. */
639static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
640 int *min_len)
641{
405c0059 642 struct inet_diag_hostcond *cond;
e31c5e0e 643 int addr_len;
405c0059
NC		 644
645 /* Check hostcond space. */
646 *min_len += sizeof(struct inet_diag_hostcond);
647 if (len < *min_len)
648 return false;
649 cond = (struct inet_diag_hostcond *)(op + 1);
650
651 /* Check address family and address length. */
652 switch (cond->family) {
653 case AF_UNSPEC:
654 addr_len = 0;
655 break;
656 case AF_INET:
657 addr_len = sizeof(struct in_addr);
658 break;
659 case AF_INET6:
660 addr_len = sizeof(struct in6_addr);
661 break;
662 default:
663 return false;
664 }
665 *min_len += addr_len;
666 if (len < *min_len)
667 return false;
668
669 /* Check prefix length (in bits) vs address length (in bytes). */
670 if (cond->prefix_len > 8 * addr_len)
671 return false;
672
673 return true;
674}
675
5e1f5420 676/* Validate a port comparison operator. */
e31c5e0e
ED		 677static bool valid_port_comparison(const struct inet_diag_bc_op *op,
678 int len, int *min_len)
5e1f5420
NC		 679{
680 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
681 *min_len += sizeof(struct inet_diag_bc_op);
682 if (len < *min_len)
683 return false;
684 return true;
685}
686
73c1f4a0 687static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
1da177e4 688{
eeb14972 689 const void *bc = bytecode;
1da177e4
LT		 690 int len = bytecode_len;
691
692 while (len > 0) {
405c0059 693 int min_len = sizeof(struct inet_diag_bc_op);
e31c5e0e 694 const struct inet_diag_bc_op *op = bc;
1da177e4 695
1da177e4 696 switch (op->code) {
73c1f4a0
ACM		 697 case INET_DIAG_BC_S_COND:
698 case INET_DIAG_BC_D_COND:
405c0059
NC		 699 if (!valid_hostcond(bc, len, &min_len))
700 return -EINVAL;
5e1f5420 701 break;
73c1f4a0
ACM		 702 case INET_DIAG_BC_S_GE:
703 case INET_DIAG_BC_S_LE:
704 case INET_DIAG_BC_D_GE:
705 case INET_DIAG_BC_D_LE:
5e1f5420 706 if (!valid_port_comparison(bc, len, &min_len))
1da177e4
LT		 707 return -EINVAL;
708 break;
5e1f5420
NC		 709 case INET_DIAG_BC_AUTO:
710 case INET_DIAG_BC_JMP:
73c1f4a0 711 case INET_DIAG_BC_NOP:
1da177e4
LT		 712 break;
713 default:
714 return -EINVAL;
715 }
5e1f5420
NC		 716
717 if (op->code != INET_DIAG_BC_NOP) {
718 if (op->no < min_len || op->no > len + 4 || op->no & 3)
719 return -EINVAL;
720 if (op->no < len &&
721 !valid_cc(bytecode, bytecode_len, len - op->no))
722 return -EINVAL;
723 }
724
405c0059 725 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
eeb14972 726 return -EINVAL;
4e852c02 727 bc += op->yes;
1da177e4
LT		 728 len -= op->yes;
729 }
730 return len == 0 ? 0 : -EINVAL;
731}
732
dff2c035
ACM		 733static int inet_csk_diag_dump(struct sock *sk,
734 struct sk_buff *skb,
37f352b5 735 struct netlink_callback *cb,
34160ea3 736 const struct inet_diag_req_v2 *r,
37f352b5 737 const struct nlattr *bc)
1da177e4 738{
8d07d151
PE		 739 if (!inet_diag_bc_sk(bc, sk))
740 return 0;
1da177e4 741
a029fe26 742 return inet_csk_diag_fill(sk, skb, r,
e32123e5 743 sk_user_ns(NETLINK_CB(cb->skb).sk),
15e47304 744 NETLINK_CB(cb->skb).portid,
dff2c035 745 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
1da177e4
LT		 746}
747
49612729
ED		 748static void twsk_build_assert(void)
749{
750 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
751 offsetof(struct sock, sk_family));
752
753 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
754 offsetof(struct inet_sock, inet_num));
755
756 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
757 offsetof(struct inet_sock, inet_dport));
758
759 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
760 offsetof(struct inet_sock, inet_rcv_saddr));
761
762 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
763 offsetof(struct inet_sock, inet_daddr));
764
765#if IS_ENABLED(CONFIG_IPV6)
766 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
767 offsetof(struct sock, sk_v6_rcv_saddr));
768
769 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
770 offsetof(struct sock, sk_v6_daddr));
771#endif
772}
773
1942c518 774void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
e31c5e0e 775 struct netlink_callback *cb,
34160ea3 776 const struct inet_diag_req_v2 *r, struct nlattr *bc)
1da177e4 777{
51d7cccf 778 struct net *net = sock_net(skb->sk);
e31c5e0e 779 int i, num, s_i, s_num;
079096f1 780 u32 idiag_states = r->idiag_states;
4e852c02 781
079096f1
ED		 782 if (idiag_states & TCPF_SYN_RECV)
783 idiag_states |= TCPF_NEW_SYN_RECV;
1da177e4
LT		 784 s_i = cb->args[1];
785 s_num = num = cb->args[2];
4f5736c4 786
1da177e4 787 if (cb->args[0] == 0) {
079096f1 788 if (!(idiag_states & TCPF_LISTEN))
1da177e4 789 goto skip_listen_ht;
540722ff 790
0f7ff927 791 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
5caea4ea 792 struct inet_listen_hashbucket *ilb;
e31c5e0e 793 struct sock *sk;
1da177e4
LT		 794
795 num = 0;
5caea4ea
ED		 796 ilb = &hashinfo->listening_hash[i];
797 spin_lock_bh(&ilb->lock);
3b24d854 798 sk_for_each(sk, &ilb->head) {
1da177e4
LT		 799 struct inet_sock *inet = inet_sk(sk);
800
51d7cccf
AV		 801 if (!net_eq(sock_net(sk), net))
802 continue;
803
1da177e4
LT		 804 if (num < s_num) {
805 num++;
806 continue;
807 }
808
d23deaa0 809 if (r->sdiag_family != AF_UNSPEC &&
e31c5e0e 810 sk->sk_family != r->sdiag_family)
d23deaa0
PE		 811 goto next_listen;
812
c720c7e8 813 if (r->id.idiag_sport != inet->inet_sport &&
73c1f4a0 814 r->id.idiag_sport)
1da177e4
LT		 815 goto next_listen;
816
079096f1 817 if (r->id.idiag_dport ||
1da177e4 818 cb->args[3] > 0)
1da177e4
LT		 819 goto next_listen;
820
079096f1 821 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
5caea4ea 822 spin_unlock_bh(&ilb->lock);
1da177e4
LT		 823 goto done;
824 }
825
826next_listen:
827 cb->args[3] = 0;
828 cb->args[4] = 0;
829 ++num;
830 }
5caea4ea 831 spin_unlock_bh(&ilb->lock);
1da177e4
LT		 832
833 s_num = 0;
834 cb->args[3] = 0;
835 cb->args[4] = 0;
836 }
1da177e4
LT		 837skip_listen_ht:
838 cb->args[0] = 1;
839 s_i = num = s_num = 0;
840 }
841
079096f1 842 if (!(idiag_states & ~TCPF_LISTEN))
efb3cb42 843 goto out;
1da177e4 844
f373b53b 845 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
540722ff 846 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
7e3aab4a 847 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
3ab5aee7 848 struct hlist_nulls_node *node;
e31c5e0e 849 struct sock *sk;
1da177e4 850
6be547a6
AK		 851 num = 0;
852
05dbc7b5 853 if (hlist_nulls_empty(&head->chain))
6be547a6
AK		 854 continue;
855
1da177e4
LT		 856 if (i > s_i)
857 s_num = 0;
858
7e3aab4a 859 spin_lock_bh(lock);
3ab5aee7 860 sk_nulls_for_each(sk, node, &head->chain) {
e31c5e0e 861 int state, res;
1da177e4 862
51d7cccf
AV		 863 if (!net_eq(sock_net(sk), net))
864 continue;
1da177e4
LT		 865 if (num < s_num)
866 goto next_normal;
70315d22
NC		 867 state = (sk->sk_state == TCP_TIME_WAIT) ?
868 inet_twsk(sk)->tw_substate : sk->sk_state;
079096f1 869 if (!(idiag_states & (1 << state)))
1da177e4 870 goto next_normal;
d23deaa0 871 if (r->sdiag_family != AF_UNSPEC &&
05dbc7b5 872 sk->sk_family != r->sdiag_family)
d23deaa0 873 goto next_normal;
05dbc7b5 874 if (r->id.idiag_sport != htons(sk->sk_num) &&
73c1f4a0 875 r->id.idiag_sport)
1da177e4 876 goto next_normal;
05dbc7b5 877 if (r->id.idiag_dport != sk->sk_dport &&
4e852c02 878 r->id.idiag_dport)
1da177e4 879 goto next_normal;
a58917f5
ED		 880 twsk_build_assert();
881
882 if (!inet_diag_bc_sk(bc, sk))
883 goto next_normal;
884
885 res = sk_diag_fill(sk, skb, r,
886 sk_user_ns(NETLINK_CB(cb->skb).sk),
887 NETLINK_CB(cb->skb).portid,
888 cb->nlh->nlmsg_seq, NLM_F_MULTI,
889 cb->nlh);
05dbc7b5 890 if (res < 0) {
7e3aab4a 891 spin_unlock_bh(lock);
1da177e4
LT		 892 goto done;
893 }
894next_normal:
895 ++num;
896 }
897
7e3aab4a 898 spin_unlock_bh(lock);
acffb584 899 cond_resched();
1da177e4
LT		 900 }
901
902done:
903 cb->args[1] = i;
904 cb->args[2] = num;
efb3cb42
PE		 905out:
906 ;
907}
1942c518 908EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
efb3cb42
PE		 909
910static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
34160ea3 911 const struct inet_diag_req_v2 *r,
e31c5e0e 912 struct nlattr *bc)
efb3cb42
PE		 913{
914 const struct inet_diag_handler *handler;
cacb6ba0 915 int err = 0;
efb3cb42
PE		 916
917 handler = inet_diag_lock_handler(r->sdiag_protocol);
918 if (!IS_ERR(handler))
1942c518 919 handler->dump(skb, cb, r, bc);
cacb6ba0
CG		 920 else
921 err = PTR_ERR(handler);
d523a328 922 inet_diag_unlock_handler(handler);
efb3cb42 923
cacb6ba0 924 return err ? : skb->len;
1da177e4
LT		 925}
926
25c4cd2b
PE		 927static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
928{
c8991362 929 int hdrlen = sizeof(struct inet_diag_req_v2);
e31c5e0e 930 struct nlattr *bc = NULL;
25c4cd2b
PE		 931
932 if (nlmsg_attrlen(cb->nlh, hdrlen))
933 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
934
d106352d 935 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
25c4cd2b
PE		 936}
937
e31c5e0e 938static int inet_diag_type2proto(int type)
a029fe26
PE		 939{
940 switch (type) {
941 case TCPDIAG_GETSOCK:
942 return IPPROTO_TCP;
943 case DCCPDIAG_GETSOCK:
944 return IPPROTO_DCCP;
945 default:
946 return 0;
947 }
948}
949
e31c5e0e
ED		 950static int inet_diag_dump_compat(struct sk_buff *skb,
951 struct netlink_callback *cb)
25c4cd2b 952{
d106352d 953 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
e31c5e0e 954 int hdrlen = sizeof(struct inet_diag_req);
c8991362 955 struct inet_diag_req_v2 req;
25c4cd2b 956 struct nlattr *bc = NULL;
25c4cd2b 957
d23deaa0 958 req.sdiag_family = AF_UNSPEC; /* compatibility */
25c4cd2b
PE		 959 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
960 req.idiag_ext = rc->idiag_ext;
961 req.idiag_states = rc->idiag_states;
962 req.id = rc->id;
963
964 if (nlmsg_attrlen(cb->nlh, hdrlen))
965 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
966
967 return __inet_diag_dump(skb, cb, &req, bc);
968}
969
fe50ce28 970static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
e31c5e0e 971 const struct nlmsghdr *nlh)
fe50ce28 972{
d106352d 973 struct inet_diag_req *rc = nlmsg_data(nlh);
c8991362 974 struct inet_diag_req_v2 req;
fe50ce28
PE		 975
976 req.sdiag_family = rc->idiag_family;
977 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
978 req.idiag_ext = rc->idiag_ext;
979 req.idiag_states = rc->idiag_states;
980 req.id = rc->id;
981
6eb5d2e0 982 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
fe50ce28
PE		 983}
984
8d34172d 985static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 986{
3b09c84c 987 int hdrlen = sizeof(struct inet_diag_req);
51d7cccf 988 struct net *net = sock_net(skb->sk);
1da177e4 989
ead592ba
TG		 990 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
991 nlmsg_len(nlh) < hdrlen)
992 return -EINVAL;
1da177e4 993
b8f3ab42 994 if (nlh->nlmsg_flags & NLM_F_DUMP) {
ead592ba
TG		 995 if (nlmsg_attrlen(nlh, hdrlen)) {
996 struct nlattr *attr;
1da177e4 997
ead592ba
TG		 998 attr = nlmsg_find_attr(nlh, hdrlen,
999 INET_DIAG_REQ_BYTECODE);
e31c5e0e 1000 if (!attr ||
ead592ba
TG		 1001 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1002 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1003 return -EINVAL;
1004 }
80d326fa
PNA		 1005 {
1006 struct netlink_dump_control c = {
1007 .dump = inet_diag_dump_compat,
1008 };
51d7cccf 1009 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
80d326fa 1010 }
1da177e4 1011 }
ead592ba 1012
fe50ce28 1013 return inet_diag_get_exact_compat(skb, nlh);
1da177e4
LT		 1014}
1015
6eb5d2e0 1016static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
d366477a 1017{
c8991362 1018 int hdrlen = sizeof(struct inet_diag_req_v2);
51d7cccf 1019 struct net *net = sock_net(skb->sk);
d366477a
PE		 1020
1021 if (nlmsg_len(h) < hdrlen)
1022 return -EINVAL;
1023
6eb5d2e0
LC		 1024 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1025 h->nlmsg_flags & NLM_F_DUMP) {
25c4cd2b
PE		 1026 if (nlmsg_attrlen(h, hdrlen)) {
1027 struct nlattr *attr;
e31c5e0e 1028
25c4cd2b
PE		 1029 attr = nlmsg_find_attr(h, hdrlen,
1030 INET_DIAG_REQ_BYTECODE);
e31c5e0e 1031 if (!attr ||
25c4cd2b
PE		 1032 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1033 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1034 return -EINVAL;
1035 }
80d326fa
PNA		 1036 {
1037 struct netlink_dump_control c = {
1038 .dump = inet_diag_dump,
1039 };
51d7cccf 1040 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
80d326fa 1041 }
d366477a
PE		 1042 }
1043
6eb5d2e0 1044 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
d366477a
PE		 1045}
1046
35ac838a
CG		 1047static
1048int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1049{
1050 const struct inet_diag_handler *handler;
1051 struct nlmsghdr *nlh;
1052 struct nlattr *attr;
1053 struct inet_diag_msg *r;
1054 void *info = NULL;
1055 int err = 0;
1056
1057 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1058 if (!nlh)
1059 return -ENOMEM;
1060
1061 r = nlmsg_data(nlh);
1062 memset(r, 0, sizeof(*r));
1063 inet_diag_msg_common_fill(r, sk);
e0df02e0
CG		 1064 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1065 r->id.idiag_sport = inet_sk(sk)->inet_sport;
35ac838a
CG		 1066 r->idiag_state = sk->sk_state;
1067
1068 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1069 nlmsg_cancel(skb, nlh);
1070 return err;
1071 }
1072
1073 handler = inet_diag_lock_handler(sk->sk_protocol);
1074 if (IS_ERR(handler)) {
1075 inet_diag_unlock_handler(handler);
1076 nlmsg_cancel(skb, nlh);
1077 return PTR_ERR(handler);
1078 }
1079
1080 attr = handler->idiag_info_size
1081 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1082 : NULL;
1083 if (attr)
1084 info = nla_data(attr);
1085
1086 handler->idiag_get_info(sk, r, info);
1087 inet_diag_unlock_handler(handler);
1088
1089 nlmsg_end(skb, nlh);
1090 return 0;
1091}
1092
8dcf01fc 1093static const struct sock_diag_handler inet_diag_handler = {
d366477a 1094 .family = AF_INET,
6eb5d2e0 1095 .dump = inet_diag_handler_cmd,
35ac838a 1096 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1097 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1098};
1099
8dcf01fc 1100static const struct sock_diag_handler inet6_diag_handler = {
d366477a 1101 .family = AF_INET6,
6eb5d2e0 1102 .dump = inet_diag_handler_cmd,
35ac838a 1103 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1104 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1105};
1106
4f5736c4
ACM		 1107int inet_diag_register(const struct inet_diag_handler *h)
1108{
1109 const __u16 type = h->idiag_type;
1110 int err = -EINVAL;
1111
f13c95f0 1112 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1113 goto out;
1114
d523a328 1115 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1116 err = -EEXIST;
e31c5e0e 1117 if (!inet_diag_table[type]) {
4f5736c4
ACM		 1118 inet_diag_table[type] = h;
1119 err = 0;
1120 }
d523a328 1121 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1122out:
1123 return err;
1124}
1125EXPORT_SYMBOL_GPL(inet_diag_register);
1126
1127void inet_diag_unregister(const struct inet_diag_handler *h)
1128{
1129 const __u16 type = h->idiag_type;
1130
f13c95f0 1131 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1132 return;
1133
d523a328 1134 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1135 inet_diag_table[type] = NULL;
d523a328 1136 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1137}
1138EXPORT_SYMBOL_GPL(inet_diag_unregister);
1139
73c1f4a0 1140static int __init inet_diag_init(void)
1da177e4 1141{
f13c95f0 1142 const int inet_diag_table_size = (IPPROTO_MAX *
4f5736c4
ACM		 1143 sizeof(struct inet_diag_handler *));
1144 int err = -ENOMEM;
1145
0da974f4 1146 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
4f5736c4
ACM		 1147 if (!inet_diag_table)
1148 goto out;
1149
d366477a
PE		 1150 err = sock_diag_register(&inet_diag_handler);
1151 if (err)
1152 goto out_free_nl;
1153
1154 err = sock_diag_register(&inet6_diag_handler);
1155 if (err)
1156 goto out_free_inet;
1157
8ef874bf 1158 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4
ACM		 1159out:
1160 return err;
d366477a
PE		 1161
1162out_free_inet:
1163 sock_diag_unregister(&inet_diag_handler);
1164out_free_nl:
4f5736c4
ACM		 1165 kfree(inet_diag_table);
1166 goto out;
1da177e4
LT		 1167}
1168
73c1f4a0 1169static void __exit inet_diag_exit(void)
1da177e4 1170{
d366477a
PE		 1171 sock_diag_unregister(&inet6_diag_handler);
1172 sock_diag_unregister(&inet_diag_handler);
8ef874bf 1173 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4 1174 kfree(inet_diag_table);
1da177e4
LT		 1175}
1176
73c1f4a0
ACM		 1177module_init(inet_diag_init);
1178module_exit(inet_diag_exit);
1da177e4 1179MODULE_LICENSE("GPL");
aec8dc62
PE		 1180MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1181MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
This page took 0.891388 seconds and 5 git commands to generate.