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Merge remote-tracking branch 'omap_dss2/for-next'
[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;
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
e31c5e0e 203 if (!icsk) {
62ad6fcd 204 handler->idiag_get_info(sk, r, NULL);
3c4d05c8
PE		 205 goto out;
206 }
207
6ba8a3b1
ND		 208 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
209 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
210 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
73c1f4a0
ACM		 211 r->idiag_timer = 1;
212 r->idiag_retrans = icsk->icsk_retransmits;
b7de529c
XL		 213 r->idiag_expires =
214 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
463c84b9 215 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
73c1f4a0
ACM		 216 r->idiag_timer = 4;
217 r->idiag_retrans = icsk->icsk_probes_out;
b7de529c
XL		 218 r->idiag_expires =
219 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
1da177e4 220 } else if (timer_pending(&sk->sk_timer)) {
73c1f4a0
ACM		 221 r->idiag_timer = 2;
222 r->idiag_retrans = icsk->icsk_probes_out;
b7de529c
XL		 223 r->idiag_expires =
224 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
1da177e4 225 } else {
73c1f4a0
ACM		 226 r->idiag_timer = 0;
227 r->idiag_expires = 0;
1da177e4 228 }
540722ff 229
3fd22af8 230 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
6ed46d12
ND		 231 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
232 handler->idiag_info_size,
233 INET_DIAG_PAD);
6e277ed5
TG		 234 if (!attr)
235 goto errout;
3c4d05c8 236
6e277ed5 237 info = nla_data(attr);
1da177e4
LT		 238 }
239
521f1cf1
ED		 240 if (ext & (1 << (INET_DIAG_CONG - 1))) {
241 int err = 0;
242
243 rcu_read_lock();
244 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
245 if (ca_ops)
246 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
247 rcu_read_unlock();
248 if (err < 0)
6e277ed5 249 goto errout;
521f1cf1 250 }
6e277ed5 251
4f5736c4 252 handler->idiag_get_info(sk, r, info);
1da177e4 253
521f1cf1 254 if (sk->sk_state < TCP_TIME_WAIT) {
64f40ff5
ED		 255 union tcp_cc_info info;
256 size_t sz = 0;
257 int attr;
521f1cf1
ED		 258
259 rcu_read_lock();
260 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
261 if (ca_ops && ca_ops->get_info)
64f40ff5 262 sz = ca_ops->get_info(sk, ext, &attr, &info);
521f1cf1 263 rcu_read_unlock();
64f40ff5 264 if (sz && nla_put(skb, attr, sz, &info) < 0)
521f1cf1
ED		 265 goto errout;
266 }
1da177e4 267
3c4d05c8 268out:
053c095a
JB		 269 nlmsg_end(skb, nlh);
270 return 0;
1da177e4 271
6e277ed5
TG		 272errout:
273 nlmsg_cancel(skb, nlh);
26932566 274 return -EMSGSIZE;
1da177e4 275}
3c4d05c8
PE		 276EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
277
278static int inet_csk_diag_fill(struct sock *sk,
e31c5e0e 279 struct sk_buff *skb,
34160ea3 280 const struct inet_diag_req_v2 *req,
d06ca956 281 struct user_namespace *user_ns,
15e47304 282 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca
LC		 283 const struct nlmsghdr *unlh,
284 bool net_admin)
3c4d05c8 285{
d545caca
LC		 286 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
287 portid, seq, nlmsg_flags, unlh, net_admin);
3c4d05c8 288}
1da177e4 289
33cf7c90 290static int inet_twsk_diag_fill(struct sock *sk,
e31c5e0e 291 struct sk_buff *skb,
15e47304 292 u32 portid, u32 seq, u16 nlmsg_flags,
c7d58aab
ACM		 293 const struct nlmsghdr *unlh)
294{
33cf7c90 295 struct inet_timewait_sock *tw = inet_twsk(sk);
c7d58aab 296 struct inet_diag_msg *r;
6e277ed5 297 struct nlmsghdr *nlh;
789f558c 298 long tmo;
d106352d 299
15e47304 300 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 301 nlmsg_flags);
302 if (!nlh)
d106352d 303 return -EMSGSIZE;
c7d58aab 304
d106352d 305 r = nlmsg_data(nlh);
c7d58aab
ACM		 306 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
307
789f558c 308 tmo = tw->tw_timer.expires - jiffies;
c7d58aab
ACM		 309 if (tmo < 0)
310 tmo = 0;
311
a4458343 312 inet_diag_msg_common_fill(r, sk);
c7d58aab 313 r->idiag_retrans = 0;
b1aac815 314
c7d58aab
ACM		 315 r->idiag_state = tw->tw_substate;
316 r->idiag_timer = 3;
96f817fe 317 r->idiag_expires = jiffies_to_msecs(tmo);
c7d58aab
ACM		 318 r->idiag_rqueue = 0;
319 r->idiag_wqueue = 0;
320 r->idiag_uid = 0;
321 r->idiag_inode = 0;
6e277ed5 322
053c095a
JB		 323 nlmsg_end(skb, nlh);
324 return 0;
c7d58aab
ACM		 325}
326
a58917f5
ED		 327static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
328 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca 329 const struct nlmsghdr *unlh, bool net_admin)
a58917f5 330{
d545caca 331 struct request_sock *reqsk = inet_reqsk(sk);
a58917f5
ED		 332 struct inet_diag_msg *r;
333 struct nlmsghdr *nlh;
334 long tmo;
335
336 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
337 nlmsg_flags);
338 if (!nlh)
339 return -EMSGSIZE;
340
341 r = nlmsg_data(nlh);
342 inet_diag_msg_common_fill(r, sk);
343 r->idiag_state = TCP_SYN_RECV;
344 r->idiag_timer = 1;
d545caca 345 r->idiag_retrans = reqsk->num_retrans;
a58917f5
ED		 346
347 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
348 offsetof(struct sock, sk_cookie));
349
fa76ce73 350 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
a58917f5
ED		 351 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
352 r->idiag_rqueue = 0;
353 r->idiag_wqueue = 0;
354 r->idiag_uid = 0;
355 r->idiag_inode = 0;
356
d545caca
LC		 357 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
358 inet_rsk(reqsk)->ir_mark))
359 return -EMSGSIZE;
360
a58917f5
ED		 361 nlmsg_end(skb, nlh);
362 return 0;
363}
364
dff2c035 365static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
34160ea3 366 const struct inet_diag_req_v2 *r,
d06ca956 367 struct user_namespace *user_ns,
15e47304 368 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca 369 const struct nlmsghdr *unlh, bool net_admin)
dff2c035
ACM		 370{
371 if (sk->sk_state == TCP_TIME_WAIT)
a58917f5 372 return inet_twsk_diag_fill(sk, skb, portid, seq,
efe4208f
ED		 373 nlmsg_flags, unlh);
374
a58917f5
ED		 375 if (sk->sk_state == TCP_NEW_SYN_RECV)
376 return inet_req_diag_fill(sk, skb, portid, seq,
d545caca 377 nlmsg_flags, unlh, net_admin);
a58917f5 378
efe4208f 379 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
d545caca 380 nlmsg_flags, unlh, net_admin);
dff2c035
ACM		 381}
382
b613f56e
LC		 383struct sock *inet_diag_find_one_icsk(struct net *net,
384 struct inet_hashinfo *hashinfo,
385 const struct inet_diag_req_v2 *req)
1da177e4 386{
e31c5e0e 387 struct sock *sk;
d523a328 388
2d331915 389 rcu_read_lock();
e31c5e0e 390 if (req->sdiag_family == AF_INET)
a583636a 391 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
73c1f4a0
ACM		 392 req->id.idiag_dport, req->id.idiag_src[0],
393 req->id.idiag_sport, req->id.idiag_if);
dfd56b8b 394#if IS_ENABLED(CONFIG_IPV6)
7c130672
ED		 395 else if (req->sdiag_family == AF_INET6) {
396 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
397 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
a583636a 398 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
7c130672
ED		 399 req->id.idiag_dport, req->id.idiag_src[3],
400 req->id.idiag_sport, req->id.idiag_if);
401 else
a583636a 402 sk = inet6_lookup(net, hashinfo, NULL, 0,
7c130672
ED		 403 (struct in6_addr *)req->id.idiag_dst,
404 req->id.idiag_dport,
405 (struct in6_addr *)req->id.idiag_src,
406 req->id.idiag_sport,
407 req->id.idiag_if);
408 }
1da177e4 409#endif
2d331915
ED		 410 else {
411 rcu_read_unlock();
b613f56e 412 return ERR_PTR(-EINVAL);
2d331915
ED		 413 }
414 rcu_read_unlock();
e31c5e0e 415 if (!sk)
b613f56e 416 return ERR_PTR(-ENOENT);
1da177e4 417
b613f56e
LC		 418 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
419 sock_gen_put(sk);
420 return ERR_PTR(-ENOENT);
421 }
422
423 return sk;
424}
425EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
426
427int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
428 struct sk_buff *in_skb,
429 const struct nlmsghdr *nlh,
430 const struct inet_diag_req_v2 *req)
431{
432 struct net *net = sock_net(in_skb->sk);
433 struct sk_buff *rep;
434 struct sock *sk;
435 int err;
436
437 sk = inet_diag_find_one_icsk(net, hashinfo, req);
438 if (IS_ERR(sk))
439 return PTR_ERR(sk);
1da177e4 440
c8e2c80d 441 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
6e277ed5
TG		 442 if (!rep) {
443 err = -ENOMEM;
1da177e4 444 goto out;
6e277ed5 445 }
1da177e4 446
a029fe26 447 err = sk_diag_fill(sk, rep, req,
e32123e5 448 sk_user_ns(NETLINK_CB(in_skb).sk),
15e47304 449 NETLINK_CB(in_skb).portid,
d545caca
LC		 450 nlh->nlmsg_seq, 0, nlh,
451 netlink_net_capable(in_skb, CAP_NET_ADMIN));
26932566
PM		 452 if (err < 0) {
453 WARN_ON(err == -EMSGSIZE);
6e277ed5 454 nlmsg_free(rep);
26932566
PM		 455 goto out;
456 }
15e47304 457 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
73c1f4a0 458 MSG_DONTWAIT);
1da177e4
LT		 459 if (err > 0)
460 err = 0;
461
462out:
c1d607cc
ED		 463 if (sk)
464 sock_gen_put(sk);
465
476f7dbf
PE		 466 return err;
467}
1942c518 468EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
476f7dbf 469
6eb5d2e0 470static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
476f7dbf 471 const struct nlmsghdr *nlh,
34160ea3 472 const struct inet_diag_req_v2 *req)
476f7dbf
PE		 473{
474 const struct inet_diag_handler *handler;
475 int err;
476
477 handler = inet_diag_lock_handler(req->sdiag_protocol);
478 if (IS_ERR(handler))
479 err = PTR_ERR(handler);
6eb5d2e0 480 else if (cmd == SOCK_DIAG_BY_FAMILY)
1942c518 481 err = handler->dump_one(in_skb, nlh, req);
6eb5d2e0
LC		 482 else if (cmd == SOCK_DESTROY && handler->destroy)
483 err = handler->destroy(in_skb, req);
484 else
485 err = -EOPNOTSUPP;
d523a328 486 inet_diag_unlock_handler(handler);
476f7dbf 487
1da177e4
LT		 488 return err;
489}
490
9f855299 491static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
1da177e4
LT		 492{
493 int words = bits >> 5;
494
495 bits &= 0x1f;
496
497 if (words) {
498 if (memcmp(a1, a2, words << 2))
499 return 0;
500 }
501 if (bits) {
9f855299
AV		 502 __be32 w1, w2;
503 __be32 mask;
1da177e4
LT		 504
505 w1 = a1[words];
506 w2 = a2[words];
507
508 mask = htonl((0xffffffff) << (32 - bits));
509
510 if ((w1 ^ w2) & mask)
511 return 0;
512 }
513
514 return 1;
515}
516
87c22ea5 517static int inet_diag_bc_run(const struct nlattr *_bc,
e31c5e0e 518 const struct inet_diag_entry *entry)
1da177e4 519{
87c22ea5
PE		 520 const void *bc = nla_data(_bc);
521 int len = nla_len(_bc);
522
1da177e4
LT		 523 while (len > 0) {
524 int yes = 1;
73c1f4a0 525 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 526
527 switch (op->code) {
73c1f4a0 528 case INET_DIAG_BC_NOP:
1da177e4 529 break;
73c1f4a0 530 case INET_DIAG_BC_JMP:
1da177e4
LT		 531 yes = 0;
532 break;
73c1f4a0 533 case INET_DIAG_BC_S_GE:
1da177e4
LT		 534 yes = entry->sport >= op[1].no;
535 break;
73c1f4a0 536 case INET_DIAG_BC_S_LE:
b4ced2b7 537 yes = entry->sport <= op[1].no;
1da177e4 538 break;
73c1f4a0 539 case INET_DIAG_BC_D_GE:
1da177e4
LT		 540 yes = entry->dport >= op[1].no;
541 break;
73c1f4a0 542 case INET_DIAG_BC_D_LE:
1da177e4
LT		 543 yes = entry->dport <= op[1].no;
544 break;
73c1f4a0 545 case INET_DIAG_BC_AUTO:
1da177e4
LT		 546 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
547 break;
73c1f4a0 548 case INET_DIAG_BC_S_COND:
a8c2190e 549 case INET_DIAG_BC_D_COND: {
e31c5e0e
ED		 550 const struct inet_diag_hostcond *cond;
551 const __be32 *addr;
1da177e4 552
e31c5e0e 553 cond = (const struct inet_diag_hostcond *)(op + 1);
1da177e4 554 if (cond->port != -1 &&
73c1f4a0 555 cond->port != (op->code == INET_DIAG_BC_S_COND ?
1da177e4
LT		 556 entry->sport : entry->dport)) {
557 yes = 0;
558 break;
559 }
4e852c02 560
73c1f4a0 561 if (op->code == INET_DIAG_BC_S_COND)
1da177e4
LT		 562 addr = entry->saddr;
563 else
564 addr = entry->daddr;
565
f67caec9
NC		 566 if (cond->family != AF_UNSPEC &&
567 cond->family != entry->family) {
568 if (entry->family == AF_INET6 &&
569 cond->family == AF_INET) {
570 if (addr[0] == 0 && addr[1] == 0 &&
571 addr[2] == htonl(0xffff) &&
572 bitstring_match(addr + 3,
573 cond->addr,
574 cond->prefix_len))
575 break;
576 }
577 yes = 0;
578 break;
579 }
580
581 if (cond->prefix_len == 0)
582 break;
4e852c02
ACM		 583 if (bitstring_match(addr, cond->addr,
584 cond->prefix_len))
1da177e4 585 break;
1da177e4
LT		 586 yes = 0;
587 break;
588 }
637c841d
DA		 589 case INET_DIAG_BC_DEV_COND: {
590 u32 ifindex;
591
592 ifindex = *((const u32 *)(op + 1));
593 if (ifindex != entry->ifindex)
594 yes = 0;
595 break;
596 }
a52e95ab
LC		 597 case INET_DIAG_BC_MARK_COND: {
598 struct inet_diag_markcond *cond;
599
600 cond = (struct inet_diag_markcond *)(op + 1);
601 if ((entry->mark & cond->mask) != cond->mark)
602 yes = 0;
603 break;
604 }
1da177e4
LT		 605 }
606
4e852c02 607 if (yes) {
1da177e4
LT		 608 len -= op->yes;
609 bc += op->yes;
610 } else {
611 len -= op->no;
612 bc += op->no;
613 }
614 }
a02cec21 615 return len == 0;
1da177e4
LT		 616}
617
a4458343
ED		 618/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
619 */
620static void entry_fill_addrs(struct inet_diag_entry *entry,
621 const struct sock *sk)
622{
623#if IS_ENABLED(CONFIG_IPV6)
624 if (sk->sk_family == AF_INET6) {
625 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
626 entry->daddr = sk->sk_v6_daddr.s6_addr32;
627 } else
628#endif
629 {
630 entry->saddr = &sk->sk_rcv_saddr;
631 entry->daddr = &sk->sk_daddr;
632 }
633}
634
8d07d151
PE		 635int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
636{
8d07d151 637 struct inet_sock *inet = inet_sk(sk);
e31c5e0e 638 struct inet_diag_entry entry;
8d07d151 639
e31c5e0e 640 if (!bc)
8d07d151
PE		 641 return 1;
642
643 entry.family = sk->sk_family;
a4458343 644 entry_fill_addrs(&entry, sk);
8d07d151
PE		 645 entry.sport = inet->inet_num;
646 entry.dport = ntohs(inet->inet_dport);
637c841d 647 entry.ifindex = sk->sk_bound_dev_if;
a58917f5 648 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
a52e95ab
LC		 649 if (sk_fullsock(sk))
650 entry.mark = sk->sk_mark;
651 else if (sk->sk_state == TCP_NEW_SYN_RECV)
652 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
653 else
654 entry.mark = 0;
8d07d151
PE		 655
656 return inet_diag_bc_run(bc, &entry);
657}
658EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
659
1da177e4
LT		 660static int valid_cc(const void *bc, int len, int cc)
661{
662 while (len >= 0) {
73c1f4a0 663 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 664
665 if (cc > len)
666 return 0;
667 if (cc == len)
668 return 1;
eeb14972 669 if (op->yes < 4 || op->yes & 3)
1da177e4
LT		 670 return 0;
671 len -= op->yes;
672 bc += op->yes;
673 }
674 return 0;
675}
676
637c841d
DA		 677/* data is u32 ifindex */
678static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
679 int *min_len)
680{
681 /* Check ifindex space. */
682 *min_len += sizeof(u32);
683 if (len < *min_len)
684 return false;
685
686 return true;
687}
405c0059
NC		 688/* Validate an inet_diag_hostcond. */
689static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
690 int *min_len)
691{
405c0059 692 struct inet_diag_hostcond *cond;
e31c5e0e 693 int addr_len;
405c0059
NC		 694
695 /* Check hostcond space. */
696 *min_len += sizeof(struct inet_diag_hostcond);
697 if (len < *min_len)
698 return false;
699 cond = (struct inet_diag_hostcond *)(op + 1);
700
701 /* Check address family and address length. */
702 switch (cond->family) {
703 case AF_UNSPEC:
704 addr_len = 0;
705 break;
706 case AF_INET:
707 addr_len = sizeof(struct in_addr);
708 break;
709 case AF_INET6:
710 addr_len = sizeof(struct in6_addr);
711 break;
712 default:
713 return false;
714 }
715 *min_len += addr_len;
716 if (len < *min_len)
717 return false;
718
719 /* Check prefix length (in bits) vs address length (in bytes). */
720 if (cond->prefix_len > 8 * addr_len)
721 return false;
722
723 return true;
724}
725
5e1f5420 726/* Validate a port comparison operator. */
e31c5e0e
ED		 727static bool valid_port_comparison(const struct inet_diag_bc_op *op,
728 int len, int *min_len)
5e1f5420
NC		 729{
730 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
731 *min_len += sizeof(struct inet_diag_bc_op);
732 if (len < *min_len)
733 return false;
734 return true;
735}
736
a52e95ab
LC		 737static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
738 int *min_len)
1da177e4 739{
a52e95ab
LC		 740 *min_len += sizeof(struct inet_diag_markcond);
741 return len >= *min_len;
742}
743
744static int inet_diag_bc_audit(const struct nlattr *attr,
745 const struct sk_buff *skb)
746{
747 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
627cc4ad
LC		 748 const void *bytecode, *bc;
749 int bytecode_len, len;
750
751 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
752 return -EINVAL;
753
754 bytecode = bc = nla_data(attr);
755 len = bytecode_len = nla_len(attr);
1da177e4
LT		 756
757 while (len > 0) {
405c0059 758 int min_len = sizeof(struct inet_diag_bc_op);
e31c5e0e 759 const struct inet_diag_bc_op *op = bc;
1da177e4 760
1da177e4 761 switch (op->code) {
73c1f4a0
ACM		 762 case INET_DIAG_BC_S_COND:
763 case INET_DIAG_BC_D_COND:
405c0059
NC		 764 if (!valid_hostcond(bc, len, &min_len))
765 return -EINVAL;
5e1f5420 766 break;
637c841d
DA		 767 case INET_DIAG_BC_DEV_COND:
768 if (!valid_devcond(bc, len, &min_len))
769 return -EINVAL;
770 break;
73c1f4a0
ACM		 771 case INET_DIAG_BC_S_GE:
772 case INET_DIAG_BC_S_LE:
773 case INET_DIAG_BC_D_GE:
774 case INET_DIAG_BC_D_LE:
5e1f5420 775 if (!valid_port_comparison(bc, len, &min_len))
1da177e4
LT		 776 return -EINVAL;
777 break;
a52e95ab
LC		 778 case INET_DIAG_BC_MARK_COND:
779 if (!net_admin)
780 return -EPERM;
781 if (!valid_markcond(bc, len, &min_len))
782 return -EINVAL;
783 break;
5e1f5420
NC		 784 case INET_DIAG_BC_AUTO:
785 case INET_DIAG_BC_JMP:
73c1f4a0 786 case INET_DIAG_BC_NOP:
1da177e4
LT		 787 break;
788 default:
789 return -EINVAL;
790 }
5e1f5420
NC		 791
792 if (op->code != INET_DIAG_BC_NOP) {
793 if (op->no < min_len || op->no > len + 4 || op->no & 3)
794 return -EINVAL;
795 if (op->no < len &&
796 !valid_cc(bytecode, bytecode_len, len - op->no))
797 return -EINVAL;
798 }
799
405c0059 800 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
eeb14972 801 return -EINVAL;
4e852c02 802 bc += op->yes;
1da177e4
LT		 803 len -= op->yes;
804 }
805 return len == 0 ? 0 : -EINVAL;
806}
807
dff2c035
ACM		 808static int inet_csk_diag_dump(struct sock *sk,
809 struct sk_buff *skb,
37f352b5 810 struct netlink_callback *cb,
34160ea3 811 const struct inet_diag_req_v2 *r,
d545caca
LC		 812 const struct nlattr *bc,
813 bool net_admin)
1da177e4 814{
8d07d151
PE		 815 if (!inet_diag_bc_sk(bc, sk))
816 return 0;
1da177e4 817
a029fe26 818 return inet_csk_diag_fill(sk, skb, r,
e32123e5 819 sk_user_ns(NETLINK_CB(cb->skb).sk),
15e47304 820 NETLINK_CB(cb->skb).portid,
d545caca
LC		 821 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
822 net_admin);
1da177e4
LT		 823}
824
49612729
ED		 825static void twsk_build_assert(void)
826{
827 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
828 offsetof(struct sock, sk_family));
829
830 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
831 offsetof(struct inet_sock, inet_num));
832
833 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
834 offsetof(struct inet_sock, inet_dport));
835
836 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
837 offsetof(struct inet_sock, inet_rcv_saddr));
838
839 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
840 offsetof(struct inet_sock, inet_daddr));
841
842#if IS_ENABLED(CONFIG_IPV6)
843 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
844 offsetof(struct sock, sk_v6_rcv_saddr));
845
846 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
847 offsetof(struct sock, sk_v6_daddr));
848#endif
849}
850
1942c518 851void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
e31c5e0e 852 struct netlink_callback *cb,
34160ea3 853 const struct inet_diag_req_v2 *r, struct nlattr *bc)
1da177e4 854{
51d7cccf 855 struct net *net = sock_net(skb->sk);
e31c5e0e 856 int i, num, s_i, s_num;
079096f1 857 u32 idiag_states = r->idiag_states;
d545caca 858 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
4e852c02 859
079096f1
ED		 860 if (idiag_states & TCPF_SYN_RECV)
861 idiag_states |= TCPF_NEW_SYN_RECV;
1da177e4
LT		 862 s_i = cb->args[1];
863 s_num = num = cb->args[2];
4f5736c4 864
1da177e4 865 if (cb->args[0] == 0) {
079096f1 866 if (!(idiag_states & TCPF_LISTEN))
1da177e4 867 goto skip_listen_ht;
540722ff 868
0f7ff927 869 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
5caea4ea 870 struct inet_listen_hashbucket *ilb;
e31c5e0e 871 struct sock *sk;
1da177e4
LT		 872
873 num = 0;
5caea4ea
ED		 874 ilb = &hashinfo->listening_hash[i];
875 spin_lock_bh(&ilb->lock);
3b24d854 876 sk_for_each(sk, &ilb->head) {
1da177e4
LT		 877 struct inet_sock *inet = inet_sk(sk);
878
51d7cccf
AV		 879 if (!net_eq(sock_net(sk), net))
880 continue;
881
1da177e4
LT		 882 if (num < s_num) {
883 num++;
884 continue;
885 }
886
d23deaa0 887 if (r->sdiag_family != AF_UNSPEC &&
e31c5e0e 888 sk->sk_family != r->sdiag_family)
d23deaa0
PE		 889 goto next_listen;
890
c720c7e8 891 if (r->id.idiag_sport != inet->inet_sport &&
73c1f4a0 892 r->id.idiag_sport)
1da177e4
LT		 893 goto next_listen;
894
079096f1 895 if (r->id.idiag_dport ||
1da177e4 896 cb->args[3] > 0)
1da177e4
LT		 897 goto next_listen;
898
d545caca
LC		 899 if (inet_csk_diag_dump(sk, skb, cb, r,
900 bc, net_admin) < 0) {
5caea4ea 901 spin_unlock_bh(&ilb->lock);
1da177e4
LT		 902 goto done;
903 }
904
905next_listen:
906 cb->args[3] = 0;
907 cb->args[4] = 0;
908 ++num;
909 }
5caea4ea 910 spin_unlock_bh(&ilb->lock);
1da177e4
LT		 911
912 s_num = 0;
913 cb->args[3] = 0;
914 cb->args[4] = 0;
915 }
1da177e4
LT		 916skip_listen_ht:
917 cb->args[0] = 1;
918 s_i = num = s_num = 0;
919 }
920
079096f1 921 if (!(idiag_states & ~TCPF_LISTEN))
efb3cb42 922 goto out;
1da177e4 923
f373b53b 924 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
540722ff 925 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
7e3aab4a 926 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
3ab5aee7 927 struct hlist_nulls_node *node;
e31c5e0e 928 struct sock *sk;
1da177e4 929
6be547a6
AK		 930 num = 0;
931
05dbc7b5 932 if (hlist_nulls_empty(&head->chain))
6be547a6
AK		 933 continue;
934
1da177e4
LT		 935 if (i > s_i)
936 s_num = 0;
937
7e3aab4a 938 spin_lock_bh(lock);
3ab5aee7 939 sk_nulls_for_each(sk, node, &head->chain) {
e31c5e0e 940 int state, res;
1da177e4 941
51d7cccf
AV		 942 if (!net_eq(sock_net(sk), net))
943 continue;
1da177e4
LT		 944 if (num < s_num)
945 goto next_normal;
70315d22
NC		 946 state = (sk->sk_state == TCP_TIME_WAIT) ?
947 inet_twsk(sk)->tw_substate : sk->sk_state;
079096f1 948 if (!(idiag_states & (1 << state)))
1da177e4 949 goto next_normal;
d23deaa0 950 if (r->sdiag_family != AF_UNSPEC &&
05dbc7b5 951 sk->sk_family != r->sdiag_family)
d23deaa0 952 goto next_normal;
05dbc7b5 953 if (r->id.idiag_sport != htons(sk->sk_num) &&
73c1f4a0 954 r->id.idiag_sport)
1da177e4 955 goto next_normal;
05dbc7b5 956 if (r->id.idiag_dport != sk->sk_dport &&
4e852c02 957 r->id.idiag_dport)
1da177e4 958 goto next_normal;
a58917f5
ED		 959 twsk_build_assert();
960
961 if (!inet_diag_bc_sk(bc, sk))
962 goto next_normal;
963
964 res = sk_diag_fill(sk, skb, r,
965 sk_user_ns(NETLINK_CB(cb->skb).sk),
966 NETLINK_CB(cb->skb).portid,
967 cb->nlh->nlmsg_seq, NLM_F_MULTI,
d545caca 968 cb->nlh, net_admin);
05dbc7b5 969 if (res < 0) {
7e3aab4a 970 spin_unlock_bh(lock);
1da177e4
LT		 971 goto done;
972 }
973next_normal:
974 ++num;
975 }
976
7e3aab4a 977 spin_unlock_bh(lock);
acffb584 978 cond_resched();
1da177e4
LT		 979 }
980
981done:
982 cb->args[1] = i;
983 cb->args[2] = num;
efb3cb42
PE		 984out:
985 ;
986}
1942c518 987EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
efb3cb42
PE		 988
989static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
34160ea3 990 const struct inet_diag_req_v2 *r,
e31c5e0e 991 struct nlattr *bc)
efb3cb42
PE		 992{
993 const struct inet_diag_handler *handler;
cacb6ba0 994 int err = 0;
efb3cb42
PE		 995
996 handler = inet_diag_lock_handler(r->sdiag_protocol);
997 if (!IS_ERR(handler))
1942c518 998 handler->dump(skb, cb, r, bc);
cacb6ba0
CG		 999 else
1000 err = PTR_ERR(handler);
d523a328 1001 inet_diag_unlock_handler(handler);
efb3cb42 1002
cacb6ba0 1003 return err ? : skb->len;
1da177e4
LT		 1004}
1005
25c4cd2b
PE		 1006static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1007{
c8991362 1008 int hdrlen = sizeof(struct inet_diag_req_v2);
e31c5e0e 1009 struct nlattr *bc = NULL;
25c4cd2b
PE		 1010
1011 if (nlmsg_attrlen(cb->nlh, hdrlen))
1012 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1013
d106352d 1014 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
25c4cd2b
PE		 1015}
1016
e31c5e0e 1017static int inet_diag_type2proto(int type)
a029fe26
PE		 1018{
1019 switch (type) {
1020 case TCPDIAG_GETSOCK:
1021 return IPPROTO_TCP;
1022 case DCCPDIAG_GETSOCK:
1023 return IPPROTO_DCCP;
1024 default:
1025 return 0;
1026 }
1027}
1028
e31c5e0e
ED		 1029static int inet_diag_dump_compat(struct sk_buff *skb,
1030 struct netlink_callback *cb)
25c4cd2b 1031{
d106352d 1032 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
e31c5e0e 1033 int hdrlen = sizeof(struct inet_diag_req);
c8991362 1034 struct inet_diag_req_v2 req;
25c4cd2b 1035 struct nlattr *bc = NULL;
25c4cd2b 1036
d23deaa0 1037 req.sdiag_family = AF_UNSPEC; /* compatibility */
25c4cd2b
PE		 1038 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1039 req.idiag_ext = rc->idiag_ext;
1040 req.idiag_states = rc->idiag_states;
1041 req.id = rc->id;
1042
1043 if (nlmsg_attrlen(cb->nlh, hdrlen))
1044 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1045
1046 return __inet_diag_dump(skb, cb, &req, bc);
1047}
1048
fe50ce28 1049static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
e31c5e0e 1050 const struct nlmsghdr *nlh)
fe50ce28 1051{
d106352d 1052 struct inet_diag_req *rc = nlmsg_data(nlh);
c8991362 1053 struct inet_diag_req_v2 req;
fe50ce28
PE		 1054
1055 req.sdiag_family = rc->idiag_family;
1056 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1057 req.idiag_ext = rc->idiag_ext;
1058 req.idiag_states = rc->idiag_states;
1059 req.id = rc->id;
1060
6eb5d2e0 1061 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
fe50ce28
PE		 1062}
1063
8d34172d 1064static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 1065{
3b09c84c 1066 int hdrlen = sizeof(struct inet_diag_req);
51d7cccf 1067 struct net *net = sock_net(skb->sk);
1da177e4 1068
ead592ba
TG		 1069 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1070 nlmsg_len(nlh) < hdrlen)
1071 return -EINVAL;
1da177e4 1072
b8f3ab42 1073 if (nlh->nlmsg_flags & NLM_F_DUMP) {
ead592ba
TG		 1074 if (nlmsg_attrlen(nlh, hdrlen)) {
1075 struct nlattr *attr;
627cc4ad 1076 int err;
1da177e4 1077
ead592ba
TG		 1078 attr = nlmsg_find_attr(nlh, hdrlen,
1079 INET_DIAG_REQ_BYTECODE);
a52e95ab 1080 err = inet_diag_bc_audit(attr, skb);
627cc4ad
LC		 1081 if (err)
1082 return err;
ead592ba 1083 }
80d326fa
PNA		 1084 {
1085 struct netlink_dump_control c = {
1086 .dump = inet_diag_dump_compat,
1087 };
51d7cccf 1088 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
80d326fa 1089 }
1da177e4 1090 }
ead592ba 1091
fe50ce28 1092 return inet_diag_get_exact_compat(skb, nlh);
1da177e4
LT		 1093}
1094
6eb5d2e0 1095static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
d366477a 1096{
c8991362 1097 int hdrlen = sizeof(struct inet_diag_req_v2);
51d7cccf 1098 struct net *net = sock_net(skb->sk);
d366477a
PE		 1099
1100 if (nlmsg_len(h) < hdrlen)
1101 return -EINVAL;
1102
6eb5d2e0
LC		 1103 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1104 h->nlmsg_flags & NLM_F_DUMP) {
25c4cd2b
PE		 1105 if (nlmsg_attrlen(h, hdrlen)) {
1106 struct nlattr *attr;
627cc4ad 1107 int err;
e31c5e0e 1108
25c4cd2b
PE		 1109 attr = nlmsg_find_attr(h, hdrlen,
1110 INET_DIAG_REQ_BYTECODE);
a52e95ab 1111 err = inet_diag_bc_audit(attr, skb);
627cc4ad
LC		 1112 if (err)
1113 return err;
25c4cd2b 1114 }
80d326fa
PNA		 1115 {
1116 struct netlink_dump_control c = {
1117 .dump = inet_diag_dump,
1118 };
51d7cccf 1119 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
80d326fa 1120 }
d366477a
PE		 1121 }
1122
6eb5d2e0 1123 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
d366477a
PE		 1124}
1125
35ac838a
CG		 1126static
1127int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1128{
1129 const struct inet_diag_handler *handler;
1130 struct nlmsghdr *nlh;
1131 struct nlattr *attr;
1132 struct inet_diag_msg *r;
1133 void *info = NULL;
1134 int err = 0;
1135
1136 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1137 if (!nlh)
1138 return -ENOMEM;
1139
1140 r = nlmsg_data(nlh);
1141 memset(r, 0, sizeof(*r));
1142 inet_diag_msg_common_fill(r, sk);
e0df02e0
CG		 1143 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1144 r->id.idiag_sport = inet_sk(sk)->inet_sport;
35ac838a
CG		 1145 r->idiag_state = sk->sk_state;
1146
1147 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1148 nlmsg_cancel(skb, nlh);
1149 return err;
1150 }
1151
1152 handler = inet_diag_lock_handler(sk->sk_protocol);
1153 if (IS_ERR(handler)) {
1154 inet_diag_unlock_handler(handler);
1155 nlmsg_cancel(skb, nlh);
1156 return PTR_ERR(handler);
1157 }
1158
1159 attr = handler->idiag_info_size
6ed46d12
ND		 1160 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1161 handler->idiag_info_size,
1162 INET_DIAG_PAD)
35ac838a
CG		 1163 : NULL;
1164 if (attr)
1165 info = nla_data(attr);
1166
1167 handler->idiag_get_info(sk, r, info);
1168 inet_diag_unlock_handler(handler);
1169
1170 nlmsg_end(skb, nlh);
1171 return 0;
1172}
1173
8dcf01fc 1174static const struct sock_diag_handler inet_diag_handler = {
d366477a 1175 .family = AF_INET,
6eb5d2e0 1176 .dump = inet_diag_handler_cmd,
35ac838a 1177 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1178 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1179};
1180
8dcf01fc 1181static const struct sock_diag_handler inet6_diag_handler = {
d366477a 1182 .family = AF_INET6,
6eb5d2e0 1183 .dump = inet_diag_handler_cmd,
35ac838a 1184 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1185 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1186};
1187
4f5736c4
ACM		 1188int inet_diag_register(const struct inet_diag_handler *h)
1189{
1190 const __u16 type = h->idiag_type;
1191 int err = -EINVAL;
1192
f13c95f0 1193 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1194 goto out;
1195
d523a328 1196 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1197 err = -EEXIST;
e31c5e0e 1198 if (!inet_diag_table[type]) {
4f5736c4
ACM		 1199 inet_diag_table[type] = h;
1200 err = 0;
1201 }
d523a328 1202 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1203out:
1204 return err;
1205}
1206EXPORT_SYMBOL_GPL(inet_diag_register);
1207
1208void inet_diag_unregister(const struct inet_diag_handler *h)
1209{
1210 const __u16 type = h->idiag_type;
1211
f13c95f0 1212 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1213 return;
1214
d523a328 1215 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1216 inet_diag_table[type] = NULL;
d523a328 1217 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1218}
1219EXPORT_SYMBOL_GPL(inet_diag_unregister);
1220
73c1f4a0 1221static int __init inet_diag_init(void)
1da177e4 1222{
f13c95f0 1223 const int inet_diag_table_size = (IPPROTO_MAX *
4f5736c4
ACM		 1224 sizeof(struct inet_diag_handler *));
1225 int err = -ENOMEM;
1226
0da974f4 1227 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
4f5736c4
ACM		 1228 if (!inet_diag_table)
1229 goto out;
1230
d366477a
PE		 1231 err = sock_diag_register(&inet_diag_handler);
1232 if (err)
1233 goto out_free_nl;
1234
1235 err = sock_diag_register(&inet6_diag_handler);
1236 if (err)
1237 goto out_free_inet;
1238
8ef874bf 1239 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4
ACM		 1240out:
1241 return err;
d366477a
PE		 1242
1243out_free_inet:
1244 sock_diag_unregister(&inet_diag_handler);
1245out_free_nl:
4f5736c4
ACM		 1246 kfree(inet_diag_table);
1247 goto out;
1da177e4
LT		 1248}
1249
73c1f4a0 1250static void __exit inet_diag_exit(void)
1da177e4 1251{
d366477a
PE		 1252 sock_diag_unregister(&inet6_diag_handler);
1253 sock_diag_unregister(&inet_diag_handler);
8ef874bf 1254 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4 1255 kfree(inet_diag_table);
1da177e4
LT		 1256}
1257
73c1f4a0
ACM		 1258module_init(inet_diag_init);
1259module_exit(inet_diag_exit);
1da177e4 1260MODULE_LICENSE("GPL");
aec8dc62
PE		 1261MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1262MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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