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Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebieder...
[linux-2.6-block.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])
bf2ae2e4 56 sock_load_diag_module(AF_INET, proto);
d523a328
HX		 57
58 mutex_lock(&inet_diag_table_mutex);
f13c95f0 59 if (!inet_diag_table[proto])
d523a328
HX		 60 return ERR_PTR(-ENOENT);
61
f13c95f0 62 return inet_diag_table[proto];
d523a328
HX		 63}
64
e31c5e0e 65static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
d523a328
HX		 66{
67 mutex_unlock(&inet_diag_table_mutex);
68}
69
cb2050a7 70void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
a4458343
ED		 71{
72 r->idiag_family = sk->sk_family;
73
74 r->id.idiag_sport = htons(sk->sk_num);
75 r->id.idiag_dport = sk->sk_dport;
76 r->id.idiag_if = sk->sk_bound_dev_if;
77 sock_diag_save_cookie(sk, r->id.idiag_cookie);
78
79#if IS_ENABLED(CONFIG_IPV6)
80 if (sk->sk_family == AF_INET6) {
81 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
82 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
83 } else
84#endif
85 {
86 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
87 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
88
89 r->id.idiag_src[0] = sk->sk_rcv_saddr;
90 r->id.idiag_dst[0] = sk->sk_daddr;
91 }
92}
cb2050a7 93EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
a4458343 94
b37e8840
ID		 95static size_t inet_sk_attr_size(struct sock *sk,
96 const struct inet_diag_req_v2 *req,
97 bool net_admin)
c8e2c80d 98{
b37e8840
ID		 99 const struct inet_diag_handler *handler;
100 size_t aux = 0;
101
102 handler = inet_diag_table[req->sdiag_protocol];
103 if (handler && handler->idiag_get_aux_size)
104 aux = handler->idiag_get_aux_size(sk, net_admin);
105
c8e2c80d
ED		 106 return nla_total_size(sizeof(struct tcp_info))
107 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
108 + nla_total_size(1) /* INET_DIAG_TOS */
109 + nla_total_size(1) /* INET_DIAG_TCLASS */
d545caca 110 + nla_total_size(4) /* INET_DIAG_MARK */
c8e2c80d
ED		 111 + nla_total_size(sizeof(struct inet_diag_meminfo))
112 + nla_total_size(sizeof(struct inet_diag_msg))
113 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
114 + nla_total_size(TCP_CA_NAME_MAX)
115 + nla_total_size(sizeof(struct tcpvegas_info))
b37e8840 116 + aux
c8e2c80d
ED		 117 + 64;
118}
119
cb2050a7
XL		 120int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
121 struct inet_diag_msg *r, int ext,
d545caca
LC		 122 struct user_namespace *user_ns,
123 bool net_admin)
cb2050a7
XL		 124{
125 const struct inet_sock *inet = inet_sk(sk);
126
127 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
128 goto errout;
129
130 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
131 * hence this needs to be included regardless of socket family.
132 */
133 if (ext & (1 << (INET_DIAG_TOS - 1)))
134 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
135 goto errout;
136
137#if IS_ENABLED(CONFIG_IPV6)
138 if (r->idiag_family == AF_INET6) {
139 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
140 if (nla_put_u8(skb, INET_DIAG_TCLASS,
141 inet6_sk(sk)->tclass) < 0)
142 goto errout;
143
144 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
145 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
146 goto errout;
147 }
148#endif
149
d545caca
LC		 150 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
151 goto errout;
152
cb2050a7
XL		 153 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
154 r->idiag_inode = sock_i_ino(sk);
155
156 return 0;
157errout:
158 return 1;
159}
160EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
161
3c4d05c8 162int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
34160ea3 163 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
e31c5e0e
ED		 164 struct user_namespace *user_ns,
165 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca
LC		 166 const struct nlmsghdr *unlh,
167 bool net_admin)
1da177e4 168{
521f1cf1 169 const struct tcp_congestion_ops *ca_ops;
e31c5e0e
ED		 170 const struct inet_diag_handler *handler;
171 int ext = req->idiag_ext;
73c1f4a0 172 struct inet_diag_msg *r;
1da177e4 173 struct nlmsghdr *nlh;
6e277ed5 174 struct nlattr *attr;
4f5736c4 175 void *info = NULL;
4f5736c4 176
a029fe26 177 handler = inet_diag_table[req->sdiag_protocol];
e31c5e0e 178 BUG_ON(!handler);
1da177e4 179
15e47304 180 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 181 nlmsg_flags);
182 if (!nlh)
d106352d 183 return -EMSGSIZE;
4f5736c4 184
d106352d 185 r = nlmsg_data(nlh);
a58917f5 186 BUG_ON(!sk_fullsock(sk));
c7d58aab 187
a4458343 188 inet_diag_msg_common_fill(r, sk);
73c1f4a0
ACM		 189 r->idiag_state = sk->sk_state;
190 r->idiag_timer = 0;
191 r->idiag_retrans = 0;
1da177e4 192
d545caca 193 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
e4e541a8
PE		 194 goto errout;
195
6e277ed5
TG		 196 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
197 struct inet_diag_meminfo minfo = {
198 .idiag_rmem = sk_rmem_alloc_get(sk),
199 .idiag_wmem = sk->sk_wmem_queued,
200 .idiag_fmem = sk->sk_forward_alloc,
201 .idiag_tmem = sk_wmem_alloc_get(sk),
202 };
203
204 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
205 goto errout;
3c4d05c8
PE		 206 }
207
c0636faa
PE		 208 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
209 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
6e277ed5 210 goto errout;
c0636faa 211
432490f9
CG		 212 /*
213 * RAW sockets might have user-defined protocols assigned,
214 * so report the one supplied on socket creation.
215 */
216 if (sk->sk_type == SOCK_RAW) {
217 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
218 goto errout;
219 }
220
e31c5e0e 221 if (!icsk) {
62ad6fcd 222 handler->idiag_get_info(sk, r, NULL);
3c4d05c8
PE		 223 goto out;
224 }
225
6ba8a3b1 226 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
57dde7f7 227 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
6ba8a3b1 228 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
73c1f4a0
ACM		 229 r->idiag_timer = 1;
230 r->idiag_retrans = icsk->icsk_retransmits;
b7de529c
XL		 231 r->idiag_expires =
232 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
463c84b9 233 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
73c1f4a0
ACM		 234 r->idiag_timer = 4;
235 r->idiag_retrans = icsk->icsk_probes_out;
b7de529c
XL		 236 r->idiag_expires =
237 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
1da177e4 238 } else if (timer_pending(&sk->sk_timer)) {
73c1f4a0
ACM		 239 r->idiag_timer = 2;
240 r->idiag_retrans = icsk->icsk_probes_out;
b7de529c
XL		 241 r->idiag_expires =
242 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
1da177e4 243 } else {
73c1f4a0
ACM		 244 r->idiag_timer = 0;
245 r->idiag_expires = 0;
1da177e4 246 }
540722ff 247
3fd22af8 248 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
6ed46d12
ND		 249 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
250 handler->idiag_info_size,
251 INET_DIAG_PAD);
6e277ed5
TG		 252 if (!attr)
253 goto errout;
3c4d05c8 254
6e277ed5 255 info = nla_data(attr);
1da177e4
LT		 256 }
257
521f1cf1
ED		 258 if (ext & (1 << (INET_DIAG_CONG - 1))) {
259 int err = 0;
260
261 rcu_read_lock();
262 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
263 if (ca_ops)
264 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
265 rcu_read_unlock();
266 if (err < 0)
6e277ed5 267 goto errout;
521f1cf1 268 }
6e277ed5 269
4f5736c4 270 handler->idiag_get_info(sk, r, info);
1da177e4 271
b37e8840
ID		 272 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
273 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
274 goto errout;
275
521f1cf1 276 if (sk->sk_state < TCP_TIME_WAIT) {
64f40ff5
ED		 277 union tcp_cc_info info;
278 size_t sz = 0;
279 int attr;
521f1cf1
ED		 280
281 rcu_read_lock();
282 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
283 if (ca_ops && ca_ops->get_info)
64f40ff5 284 sz = ca_ops->get_info(sk, ext, &attr, &info);
521f1cf1 285 rcu_read_unlock();
64f40ff5 286 if (sz && nla_put(skb, attr, sz, &info) < 0)
521f1cf1
ED		 287 goto errout;
288 }
1da177e4 289
0888e372
LASL		 290 if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
291 u32 classid = 0;
292
293#ifdef CONFIG_SOCK_CGROUP_DATA
294 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
295#endif
296
297 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
298 goto errout;
299 }
300
3c4d05c8 301out:
053c095a
JB		 302 nlmsg_end(skb, nlh);
303 return 0;
1da177e4 304
6e277ed5
TG		 305errout:
306 nlmsg_cancel(skb, nlh);
26932566 307 return -EMSGSIZE;
1da177e4 308}
3c4d05c8
PE		 309EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
310
311static int inet_csk_diag_fill(struct sock *sk,
e31c5e0e 312 struct sk_buff *skb,
34160ea3 313 const struct inet_diag_req_v2 *req,
d06ca956 314 struct user_namespace *user_ns,
15e47304 315 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca
LC		 316 const struct nlmsghdr *unlh,
317 bool net_admin)
3c4d05c8 318{
d545caca
LC		 319 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
320 portid, seq, nlmsg_flags, unlh, net_admin);
3c4d05c8 321}
1da177e4 322
33cf7c90 323static int inet_twsk_diag_fill(struct sock *sk,
e31c5e0e 324 struct sk_buff *skb,
15e47304 325 u32 portid, u32 seq, u16 nlmsg_flags,
c7d58aab
ACM		 326 const struct nlmsghdr *unlh)
327{
33cf7c90 328 struct inet_timewait_sock *tw = inet_twsk(sk);
c7d58aab 329 struct inet_diag_msg *r;
6e277ed5 330 struct nlmsghdr *nlh;
789f558c 331 long tmo;
d106352d 332
15e47304 333 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
6e277ed5
TG		 334 nlmsg_flags);
335 if (!nlh)
d106352d 336 return -EMSGSIZE;
c7d58aab 337
d106352d 338 r = nlmsg_data(nlh);
c7d58aab
ACM		 339 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
340
789f558c 341 tmo = tw->tw_timer.expires - jiffies;
c7d58aab
ACM		 342 if (tmo < 0)
343 tmo = 0;
344
a4458343 345 inet_diag_msg_common_fill(r, sk);
c7d58aab 346 r->idiag_retrans = 0;
b1aac815 347
c7d58aab
ACM		 348 r->idiag_state = tw->tw_substate;
349 r->idiag_timer = 3;
96f817fe 350 r->idiag_expires = jiffies_to_msecs(tmo);
c7d58aab
ACM		 351 r->idiag_rqueue = 0;
352 r->idiag_wqueue = 0;
353 r->idiag_uid = 0;
354 r->idiag_inode = 0;
6e277ed5 355
053c095a
JB		 356 nlmsg_end(skb, nlh);
357 return 0;
c7d58aab
ACM		 358}
359
a58917f5
ED		 360static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
361 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca 362 const struct nlmsghdr *unlh, bool net_admin)
a58917f5 363{
d545caca 364 struct request_sock *reqsk = inet_reqsk(sk);
a58917f5
ED		 365 struct inet_diag_msg *r;
366 struct nlmsghdr *nlh;
367 long tmo;
368
369 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
370 nlmsg_flags);
371 if (!nlh)
372 return -EMSGSIZE;
373
374 r = nlmsg_data(nlh);
375 inet_diag_msg_common_fill(r, sk);
376 r->idiag_state = TCP_SYN_RECV;
377 r->idiag_timer = 1;
d545caca 378 r->idiag_retrans = reqsk->num_retrans;
a58917f5
ED		 379
380 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
381 offsetof(struct sock, sk_cookie));
382
fa76ce73 383 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
a58917f5
ED		 384 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
385 r->idiag_rqueue = 0;
386 r->idiag_wqueue = 0;
387 r->idiag_uid = 0;
388 r->idiag_inode = 0;
389
d545caca
LC		 390 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
391 inet_rsk(reqsk)->ir_mark))
392 return -EMSGSIZE;
393
a58917f5
ED		 394 nlmsg_end(skb, nlh);
395 return 0;
396}
397
dff2c035 398static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
34160ea3 399 const struct inet_diag_req_v2 *r,
d06ca956 400 struct user_namespace *user_ns,
15e47304 401 u32 portid, u32 seq, u16 nlmsg_flags,
d545caca 402 const struct nlmsghdr *unlh, bool net_admin)
dff2c035
ACM		 403{
404 if (sk->sk_state == TCP_TIME_WAIT)
a58917f5 405 return inet_twsk_diag_fill(sk, skb, portid, seq,
efe4208f
ED		 406 nlmsg_flags, unlh);
407
a58917f5
ED		 408 if (sk->sk_state == TCP_NEW_SYN_RECV)
409 return inet_req_diag_fill(sk, skb, portid, seq,
d545caca 410 nlmsg_flags, unlh, net_admin);
a58917f5 411
efe4208f 412 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
d545caca 413 nlmsg_flags, unlh, net_admin);
dff2c035
ACM		 414}
415
b613f56e
LC		 416struct sock *inet_diag_find_one_icsk(struct net *net,
417 struct inet_hashinfo *hashinfo,
418 const struct inet_diag_req_v2 *req)
1da177e4 419{
e31c5e0e 420 struct sock *sk;
d523a328 421
2d331915 422 rcu_read_lock();
e31c5e0e 423 if (req->sdiag_family == AF_INET)
a583636a 424 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
73c1f4a0
ACM		 425 req->id.idiag_dport, req->id.idiag_src[0],
426 req->id.idiag_sport, req->id.idiag_if);
dfd56b8b 427#if IS_ENABLED(CONFIG_IPV6)
7c130672
ED		 428 else if (req->sdiag_family == AF_INET6) {
429 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
430 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
a583636a 431 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
7c130672
ED		 432 req->id.idiag_dport, req->id.idiag_src[3],
433 req->id.idiag_sport, req->id.idiag_if);
434 else
a583636a 435 sk = inet6_lookup(net, hashinfo, NULL, 0,
7c130672
ED		 436 (struct in6_addr *)req->id.idiag_dst,
437 req->id.idiag_dport,
438 (struct in6_addr *)req->id.idiag_src,
439 req->id.idiag_sport,
440 req->id.idiag_if);
441 }
1da177e4 442#endif
2d331915
ED		 443 else {
444 rcu_read_unlock();
b613f56e 445 return ERR_PTR(-EINVAL);
2d331915
ED		 446 }
447 rcu_read_unlock();
e31c5e0e 448 if (!sk)
b613f56e 449 return ERR_PTR(-ENOENT);
1da177e4 450
b613f56e
LC		 451 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
452 sock_gen_put(sk);
453 return ERR_PTR(-ENOENT);
454 }
455
456 return sk;
457}
458EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
459
460int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
461 struct sk_buff *in_skb,
462 const struct nlmsghdr *nlh,
463 const struct inet_diag_req_v2 *req)
464{
b37e8840 465 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
b613f56e
LC		 466 struct net *net = sock_net(in_skb->sk);
467 struct sk_buff *rep;
468 struct sock *sk;
469 int err;
470
471 sk = inet_diag_find_one_icsk(net, hashinfo, req);
472 if (IS_ERR(sk))
473 return PTR_ERR(sk);
1da177e4 474
b37e8840 475 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
6e277ed5
TG		 476 if (!rep) {
477 err = -ENOMEM;
1da177e4 478 goto out;
6e277ed5 479 }
1da177e4 480
a029fe26 481 err = sk_diag_fill(sk, rep, req,
e32123e5 482 sk_user_ns(NETLINK_CB(in_skb).sk),
15e47304 483 NETLINK_CB(in_skb).portid,
b37e8840 484 nlh->nlmsg_seq, 0, nlh, net_admin);
26932566
PM		 485 if (err < 0) {
486 WARN_ON(err == -EMSGSIZE);
6e277ed5 487 nlmsg_free(rep);
26932566
PM		 488 goto out;
489 }
15e47304 490 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
73c1f4a0 491 MSG_DONTWAIT);
1da177e4
LT		 492 if (err > 0)
493 err = 0;
494
495out:
c1d607cc
ED		 496 if (sk)
497 sock_gen_put(sk);
498
476f7dbf
PE		 499 return err;
500}
1942c518 501EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
476f7dbf 502
6eb5d2e0 503static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
476f7dbf 504 const struct nlmsghdr *nlh,
34160ea3 505 const struct inet_diag_req_v2 *req)
476f7dbf
PE		 506{
507 const struct inet_diag_handler *handler;
508 int err;
509
510 handler = inet_diag_lock_handler(req->sdiag_protocol);
511 if (IS_ERR(handler))
512 err = PTR_ERR(handler);
6eb5d2e0 513 else if (cmd == SOCK_DIAG_BY_FAMILY)
1942c518 514 err = handler->dump_one(in_skb, nlh, req);
6eb5d2e0
LC		 515 else if (cmd == SOCK_DESTROY && handler->destroy)
516 err = handler->destroy(in_skb, req);
517 else
518 err = -EOPNOTSUPP;
d523a328 519 inet_diag_unlock_handler(handler);
476f7dbf 520
1da177e4
LT		 521 return err;
522}
523
9f855299 524static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
1da177e4
LT		 525{
526 int words = bits >> 5;
527
528 bits &= 0x1f;
529
530 if (words) {
531 if (memcmp(a1, a2, words << 2))
532 return 0;
533 }
534 if (bits) {
9f855299
AV		 535 __be32 w1, w2;
536 __be32 mask;
1da177e4
LT		 537
538 w1 = a1[words];
539 w2 = a2[words];
540
541 mask = htonl((0xffffffff) << (32 - bits));
542
543 if ((w1 ^ w2) & mask)
544 return 0;
545 }
546
547 return 1;
548}
549
87c22ea5 550static int inet_diag_bc_run(const struct nlattr *_bc,
e31c5e0e 551 const struct inet_diag_entry *entry)
1da177e4 552{
87c22ea5
PE		 553 const void *bc = nla_data(_bc);
554 int len = nla_len(_bc);
555
1da177e4
LT		 556 while (len > 0) {
557 int yes = 1;
73c1f4a0 558 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 559
560 switch (op->code) {
73c1f4a0 561 case INET_DIAG_BC_NOP:
1da177e4 562 break;
73c1f4a0 563 case INET_DIAG_BC_JMP:
1da177e4
LT		 564 yes = 0;
565 break;
bbb6189d
KE		 566 case INET_DIAG_BC_S_EQ:
567 yes = entry->sport == op[1].no;
568 break;
73c1f4a0 569 case INET_DIAG_BC_S_GE:
1da177e4
LT		 570 yes = entry->sport >= op[1].no;
571 break;
73c1f4a0 572 case INET_DIAG_BC_S_LE:
b4ced2b7 573 yes = entry->sport <= op[1].no;
1da177e4 574 break;
bbb6189d
KE		 575 case INET_DIAG_BC_D_EQ:
576 yes = entry->dport == op[1].no;
577 break;
73c1f4a0 578 case INET_DIAG_BC_D_GE:
1da177e4
LT		 579 yes = entry->dport >= op[1].no;
580 break;
73c1f4a0 581 case INET_DIAG_BC_D_LE:
1da177e4
LT		 582 yes = entry->dport <= op[1].no;
583 break;
73c1f4a0 584 case INET_DIAG_BC_AUTO:
1da177e4
LT		 585 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
586 break;
73c1f4a0 587 case INET_DIAG_BC_S_COND:
a8c2190e 588 case INET_DIAG_BC_D_COND: {
e31c5e0e
ED		 589 const struct inet_diag_hostcond *cond;
590 const __be32 *addr;
1da177e4 591
e31c5e0e 592 cond = (const struct inet_diag_hostcond *)(op + 1);
1da177e4 593 if (cond->port != -1 &&
73c1f4a0 594 cond->port != (op->code == INET_DIAG_BC_S_COND ?
1da177e4
LT		 595 entry->sport : entry->dport)) {
596 yes = 0;
597 break;
598 }
4e852c02 599
73c1f4a0 600 if (op->code == INET_DIAG_BC_S_COND)
1da177e4
LT		 601 addr = entry->saddr;
602 else
603 addr = entry->daddr;
604
f67caec9
NC		 605 if (cond->family != AF_UNSPEC &&
606 cond->family != entry->family) {
607 if (entry->family == AF_INET6 &&
608 cond->family == AF_INET) {
609 if (addr[0] == 0 && addr[1] == 0 &&
610 addr[2] == htonl(0xffff) &&
611 bitstring_match(addr + 3,
612 cond->addr,
613 cond->prefix_len))
614 break;
615 }
616 yes = 0;
617 break;
618 }
619
620 if (cond->prefix_len == 0)
621 break;
4e852c02
ACM		 622 if (bitstring_match(addr, cond->addr,
623 cond->prefix_len))
1da177e4 624 break;
1da177e4
LT		 625 yes = 0;
626 break;
627 }
637c841d
DA		 628 case INET_DIAG_BC_DEV_COND: {
629 u32 ifindex;
630
631 ifindex = *((const u32 *)(op + 1));
632 if (ifindex != entry->ifindex)
633 yes = 0;
634 break;
635 }
a52e95ab
LC		 636 case INET_DIAG_BC_MARK_COND: {
637 struct inet_diag_markcond *cond;
638
639 cond = (struct inet_diag_markcond *)(op + 1);
640 if ((entry->mark & cond->mask) != cond->mark)
641 yes = 0;
642 break;
643 }
1da177e4
LT		 644 }
645
4e852c02 646 if (yes) {
1da177e4
LT		 647 len -= op->yes;
648 bc += op->yes;
649 } else {
650 len -= op->no;
651 bc += op->no;
652 }
653 }
a02cec21 654 return len == 0;
1da177e4
LT		 655}
656
a4458343
ED		 657/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
658 */
659static void entry_fill_addrs(struct inet_diag_entry *entry,
660 const struct sock *sk)
661{
662#if IS_ENABLED(CONFIG_IPV6)
663 if (sk->sk_family == AF_INET6) {
664 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
665 entry->daddr = sk->sk_v6_daddr.s6_addr32;
666 } else
667#endif
668 {
669 entry->saddr = &sk->sk_rcv_saddr;
670 entry->daddr = &sk->sk_daddr;
671 }
672}
673
8d07d151
PE		 674int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
675{
8d07d151 676 struct inet_sock *inet = inet_sk(sk);
e31c5e0e 677 struct inet_diag_entry entry;
8d07d151 678
e31c5e0e 679 if (!bc)
8d07d151
PE		 680 return 1;
681
682 entry.family = sk->sk_family;
a4458343 683 entry_fill_addrs(&entry, sk);
8d07d151
PE		 684 entry.sport = inet->inet_num;
685 entry.dport = ntohs(inet->inet_dport);
637c841d 686 entry.ifindex = sk->sk_bound_dev_if;
a58917f5 687 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
a52e95ab
LC		 688 if (sk_fullsock(sk))
689 entry.mark = sk->sk_mark;
690 else if (sk->sk_state == TCP_NEW_SYN_RECV)
691 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
692 else
693 entry.mark = 0;
8d07d151
PE		 694
695 return inet_diag_bc_run(bc, &entry);
696}
697EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
698
1da177e4
LT		 699static int valid_cc(const void *bc, int len, int cc)
700{
701 while (len >= 0) {
73c1f4a0 702 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 703
704 if (cc > len)
705 return 0;
706 if (cc == len)
707 return 1;
eeb14972 708 if (op->yes < 4 || op->yes & 3)
1da177e4
LT		 709 return 0;
710 len -= op->yes;
711 bc += op->yes;
712 }
713 return 0;
714}
715
637c841d
DA		 716/* data is u32 ifindex */
717static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
718 int *min_len)
719{
720 /* Check ifindex space. */
721 *min_len += sizeof(u32);
722 if (len < *min_len)
723 return false;
724
725 return true;
726}
405c0059
NC		 727/* Validate an inet_diag_hostcond. */
728static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
729 int *min_len)
730{
405c0059 731 struct inet_diag_hostcond *cond;
e31c5e0e 732 int addr_len;
405c0059
NC		 733
734 /* Check hostcond space. */
735 *min_len += sizeof(struct inet_diag_hostcond);
736 if (len < *min_len)
737 return false;
738 cond = (struct inet_diag_hostcond *)(op + 1);
739
740 /* Check address family and address length. */
741 switch (cond->family) {
742 case AF_UNSPEC:
743 addr_len = 0;
744 break;
745 case AF_INET:
746 addr_len = sizeof(struct in_addr);
747 break;
748 case AF_INET6:
749 addr_len = sizeof(struct in6_addr);
750 break;
751 default:
752 return false;
753 }
754 *min_len += addr_len;
755 if (len < *min_len)
756 return false;
757
758 /* Check prefix length (in bits) vs address length (in bytes). */
759 if (cond->prefix_len > 8 * addr_len)
760 return false;
761
762 return true;
763}
764
5e1f5420 765/* Validate a port comparison operator. */
e31c5e0e
ED		 766static bool valid_port_comparison(const struct inet_diag_bc_op *op,
767 int len, int *min_len)
5e1f5420
NC		 768{
769 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
770 *min_len += sizeof(struct inet_diag_bc_op);
771 if (len < *min_len)
772 return false;
773 return true;
774}
775
a52e95ab
LC		 776static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
777 int *min_len)
1da177e4 778{
a52e95ab
LC		 779 *min_len += sizeof(struct inet_diag_markcond);
780 return len >= *min_len;
781}
782
783static int inet_diag_bc_audit(const struct nlattr *attr,
784 const struct sk_buff *skb)
785{
786 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
627cc4ad
LC		 787 const void *bytecode, *bc;
788 int bytecode_len, len;
789
790 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
791 return -EINVAL;
792
793 bytecode = bc = nla_data(attr);
794 len = bytecode_len = nla_len(attr);
1da177e4
LT		 795
796 while (len > 0) {
405c0059 797 int min_len = sizeof(struct inet_diag_bc_op);
e31c5e0e 798 const struct inet_diag_bc_op *op = bc;
1da177e4 799
1da177e4 800 switch (op->code) {
73c1f4a0
ACM		 801 case INET_DIAG_BC_S_COND:
802 case INET_DIAG_BC_D_COND:
405c0059
NC		 803 if (!valid_hostcond(bc, len, &min_len))
804 return -EINVAL;
5e1f5420 805 break;
637c841d
DA		 806 case INET_DIAG_BC_DEV_COND:
807 if (!valid_devcond(bc, len, &min_len))
808 return -EINVAL;
809 break;
bbb6189d 810 case INET_DIAG_BC_S_EQ:
73c1f4a0
ACM		 811 case INET_DIAG_BC_S_GE:
812 case INET_DIAG_BC_S_LE:
bbb6189d 813 case INET_DIAG_BC_D_EQ:
73c1f4a0
ACM		 814 case INET_DIAG_BC_D_GE:
815 case INET_DIAG_BC_D_LE:
5e1f5420 816 if (!valid_port_comparison(bc, len, &min_len))
1da177e4
LT		 817 return -EINVAL;
818 break;
a52e95ab
LC		 819 case INET_DIAG_BC_MARK_COND:
820 if (!net_admin)
821 return -EPERM;
822 if (!valid_markcond(bc, len, &min_len))
823 return -EINVAL;
824 break;
5e1f5420
NC		 825 case INET_DIAG_BC_AUTO:
826 case INET_DIAG_BC_JMP:
73c1f4a0 827 case INET_DIAG_BC_NOP:
1da177e4
LT		 828 break;
829 default:
830 return -EINVAL;
831 }
5e1f5420
NC		 832
833 if (op->code != INET_DIAG_BC_NOP) {
834 if (op->no < min_len || op->no > len + 4 || op->no & 3)
835 return -EINVAL;
836 if (op->no < len &&
837 !valid_cc(bytecode, bytecode_len, len - op->no))
838 return -EINVAL;
839 }
840
405c0059 841 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
eeb14972 842 return -EINVAL;
4e852c02 843 bc += op->yes;
1da177e4
LT		 844 len -= op->yes;
845 }
846 return len == 0 ? 0 : -EINVAL;
847}
848
dff2c035
ACM		 849static int inet_csk_diag_dump(struct sock *sk,
850 struct sk_buff *skb,
37f352b5 851 struct netlink_callback *cb,
34160ea3 852 const struct inet_diag_req_v2 *r,
d545caca
LC		 853 const struct nlattr *bc,
854 bool net_admin)
1da177e4 855{
8d07d151
PE		 856 if (!inet_diag_bc_sk(bc, sk))
857 return 0;
1da177e4 858
a029fe26 859 return inet_csk_diag_fill(sk, skb, r,
e32123e5 860 sk_user_ns(NETLINK_CB(cb->skb).sk),
15e47304 861 NETLINK_CB(cb->skb).portid,
d545caca
LC		 862 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
863 net_admin);
1da177e4
LT		 864}
865
49612729
ED		 866static void twsk_build_assert(void)
867{
868 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
869 offsetof(struct sock, sk_family));
870
871 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
872 offsetof(struct inet_sock, inet_num));
873
874 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
875 offsetof(struct inet_sock, inet_dport));
876
877 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
878 offsetof(struct inet_sock, inet_rcv_saddr));
879
880 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
881 offsetof(struct inet_sock, inet_daddr));
882
883#if IS_ENABLED(CONFIG_IPV6)
884 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
885 offsetof(struct sock, sk_v6_rcv_saddr));
886
887 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
888 offsetof(struct sock, sk_v6_daddr));
889#endif
890}
891
1942c518 892void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
e31c5e0e 893 struct netlink_callback *cb,
34160ea3 894 const struct inet_diag_req_v2 *r, struct nlattr *bc)
1da177e4 895{
67db3e4b 896 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
51d7cccf 897 struct net *net = sock_net(skb->sk);
079096f1 898 u32 idiag_states = r->idiag_states;
67db3e4b
ED		 899 int i, num, s_i, s_num;
900 struct sock *sk;
4e852c02 901
079096f1
ED		 902 if (idiag_states & TCPF_SYN_RECV)
903 idiag_states |= TCPF_NEW_SYN_RECV;
1da177e4
LT		 904 s_i = cb->args[1];
905 s_num = num = cb->args[2];
4f5736c4 906
1da177e4 907 if (cb->args[0] == 0) {
9652dc2e 908 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1da177e4 909 goto skip_listen_ht;
540722ff 910
0f7ff927 911 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
5caea4ea 912 struct inet_listen_hashbucket *ilb;
1da177e4
LT		 913
914 num = 0;
5caea4ea 915 ilb = &hashinfo->listening_hash[i];
9652dc2e 916 spin_lock(&ilb->lock);
3b24d854 917 sk_for_each(sk, &ilb->head) {
1da177e4
LT		 918 struct inet_sock *inet = inet_sk(sk);
919
51d7cccf
AV		 920 if (!net_eq(sock_net(sk), net))
921 continue;
922
1da177e4
LT		 923 if (num < s_num) {
924 num++;
925 continue;
926 }
927
d23deaa0 928 if (r->sdiag_family != AF_UNSPEC &&
e31c5e0e 929 sk->sk_family != r->sdiag_family)
d23deaa0
PE		 930 goto next_listen;
931
c720c7e8 932 if (r->id.idiag_sport != inet->inet_sport &&
73c1f4a0 933 r->id.idiag_sport)
1da177e4
LT		 934 goto next_listen;
935
d545caca
LC		 936 if (inet_csk_diag_dump(sk, skb, cb, r,
937 bc, net_admin) < 0) {
9652dc2e 938 spin_unlock(&ilb->lock);
1da177e4
LT		 939 goto done;
940 }
941
942next_listen:
1da177e4
LT		 943 ++num;
944 }
9652dc2e 945 spin_unlock(&ilb->lock);
1da177e4
LT		 946
947 s_num = 0;
1da177e4 948 }
1da177e4
LT		 949skip_listen_ht:
950 cb->args[0] = 1;
951 s_i = num = s_num = 0;
952 }
953
079096f1 954 if (!(idiag_states & ~TCPF_LISTEN))
efb3cb42 955 goto out;
1da177e4 956
67db3e4b 957#define SKARR_SZ 16
f373b53b 958 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
540722ff 959 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
7e3aab4a 960 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
3ab5aee7 961 struct hlist_nulls_node *node;
67db3e4b
ED		 962 struct sock *sk_arr[SKARR_SZ];
963 int num_arr[SKARR_SZ];
964 int idx, accum, res;
6be547a6 965
05dbc7b5 966 if (hlist_nulls_empty(&head->chain))
6be547a6
AK		 967 continue;
968
1da177e4
LT		 969 if (i > s_i)
970 s_num = 0;
971
67db3e4b
ED		 972next_chunk:
973 num = 0;
974 accum = 0;
7e3aab4a 975 spin_lock_bh(lock);
3ab5aee7 976 sk_nulls_for_each(sk, node, &head->chain) {
67db3e4b 977 int state;
1da177e4 978
51d7cccf
AV		 979 if (!net_eq(sock_net(sk), net))
980 continue;
1da177e4
LT		 981 if (num < s_num)
982 goto next_normal;
70315d22
NC		 983 state = (sk->sk_state == TCP_TIME_WAIT) ?
984 inet_twsk(sk)->tw_substate : sk->sk_state;
079096f1 985 if (!(idiag_states & (1 << state)))
1da177e4 986 goto next_normal;
d23deaa0 987 if (r->sdiag_family != AF_UNSPEC &&
05dbc7b5 988 sk->sk_family != r->sdiag_family)
d23deaa0 989 goto next_normal;
05dbc7b5 990 if (r->id.idiag_sport != htons(sk->sk_num) &&
73c1f4a0 991 r->id.idiag_sport)
1da177e4 992 goto next_normal;
05dbc7b5 993 if (r->id.idiag_dport != sk->sk_dport &&
4e852c02 994 r->id.idiag_dport)
1da177e4 995 goto next_normal;
a58917f5
ED		 996 twsk_build_assert();
997
998 if (!inet_diag_bc_sk(bc, sk))
999 goto next_normal;
1000
67db3e4b
ED		 1001 sock_hold(sk);
1002 num_arr[accum] = num;
1003 sk_arr[accum] = sk;
1004 if (++accum == SKARR_SZ)
1005 break;
1006next_normal:
1007 ++num;
1008 }
1009 spin_unlock_bh(lock);
1010 res = 0;
1011 for (idx = 0; idx < accum; idx++) {
1012 if (res >= 0) {
1013 res = sk_diag_fill(sk_arr[idx], skb, r,
a58917f5
ED		 1014 sk_user_ns(NETLINK_CB(cb->skb).sk),
1015 NETLINK_CB(cb->skb).portid,
1016 cb->nlh->nlmsg_seq, NLM_F_MULTI,
d545caca 1017 cb->nlh, net_admin);
67db3e4b
ED		 1018 if (res < 0)
1019 num = num_arr[idx];
1da177e4 1020 }
67db3e4b 1021 sock_gen_put(sk_arr[idx]);
1da177e4 1022 }
67db3e4b
ED		 1023 if (res < 0)
1024 break;
acffb584 1025 cond_resched();
67db3e4b
ED		 1026 if (accum == SKARR_SZ) {
1027 s_num = num + 1;
1028 goto next_chunk;
1029 }
1da177e4
LT		 1030 }
1031
1032done:
1033 cb->args[1] = i;
1034 cb->args[2] = num;
efb3cb42
PE		 1035out:
1036 ;
1037}
1942c518 1038EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
efb3cb42
PE		 1039
1040static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
34160ea3 1041 const struct inet_diag_req_v2 *r,
e31c5e0e 1042 struct nlattr *bc)
efb3cb42
PE		 1043{
1044 const struct inet_diag_handler *handler;
cacb6ba0 1045 int err = 0;
efb3cb42
PE		 1046
1047 handler = inet_diag_lock_handler(r->sdiag_protocol);
1048 if (!IS_ERR(handler))
1942c518 1049 handler->dump(skb, cb, r, bc);
cacb6ba0
CG		 1050 else
1051 err = PTR_ERR(handler);
d523a328 1052 inet_diag_unlock_handler(handler);
efb3cb42 1053
cacb6ba0 1054 return err ? : skb->len;
1da177e4
LT		 1055}
1056
25c4cd2b
PE		 1057static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1058{
c8991362 1059 int hdrlen = sizeof(struct inet_diag_req_v2);
e31c5e0e 1060 struct nlattr *bc = NULL;
25c4cd2b
PE		 1061
1062 if (nlmsg_attrlen(cb->nlh, hdrlen))
1063 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1064
d106352d 1065 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
25c4cd2b
PE		 1066}
1067
e31c5e0e 1068static int inet_diag_type2proto(int type)
a029fe26
PE		 1069{
1070 switch (type) {
1071 case TCPDIAG_GETSOCK:
1072 return IPPROTO_TCP;
1073 case DCCPDIAG_GETSOCK:
1074 return IPPROTO_DCCP;
1075 default:
1076 return 0;
1077 }
1078}
1079
e31c5e0e
ED		 1080static int inet_diag_dump_compat(struct sk_buff *skb,
1081 struct netlink_callback *cb)
25c4cd2b 1082{
d106352d 1083 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
e31c5e0e 1084 int hdrlen = sizeof(struct inet_diag_req);
c8991362 1085 struct inet_diag_req_v2 req;
25c4cd2b 1086 struct nlattr *bc = NULL;
25c4cd2b 1087
d23deaa0 1088 req.sdiag_family = AF_UNSPEC; /* compatibility */
25c4cd2b
PE		 1089 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1090 req.idiag_ext = rc->idiag_ext;
1091 req.idiag_states = rc->idiag_states;
1092 req.id = rc->id;
1093
1094 if (nlmsg_attrlen(cb->nlh, hdrlen))
1095 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1096
1097 return __inet_diag_dump(skb, cb, &req, bc);
1098}
1099
fe50ce28 1100static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
e31c5e0e 1101 const struct nlmsghdr *nlh)
fe50ce28 1102{
d106352d 1103 struct inet_diag_req *rc = nlmsg_data(nlh);
c8991362 1104 struct inet_diag_req_v2 req;
fe50ce28
PE		 1105
1106 req.sdiag_family = rc->idiag_family;
1107 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1108 req.idiag_ext = rc->idiag_ext;
1109 req.idiag_states = rc->idiag_states;
1110 req.id = rc->id;
1111
6eb5d2e0 1112 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
fe50ce28
PE		 1113}
1114
8d34172d 1115static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 1116{
3b09c84c 1117 int hdrlen = sizeof(struct inet_diag_req);
51d7cccf 1118 struct net *net = sock_net(skb->sk);
1da177e4 1119
ead592ba
TG		 1120 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1121 nlmsg_len(nlh) < hdrlen)
1122 return -EINVAL;
1da177e4 1123
b8f3ab42 1124 if (nlh->nlmsg_flags & NLM_F_DUMP) {
ead592ba
TG		 1125 if (nlmsg_attrlen(nlh, hdrlen)) {
1126 struct nlattr *attr;
627cc4ad 1127 int err;
1da177e4 1128
ead592ba
TG		 1129 attr = nlmsg_find_attr(nlh, hdrlen,
1130 INET_DIAG_REQ_BYTECODE);
a52e95ab 1131 err = inet_diag_bc_audit(attr, skb);
627cc4ad
LC		 1132 if (err)
1133 return err;
ead592ba 1134 }
80d326fa
PNA		 1135 {
1136 struct netlink_dump_control c = {
1137 .dump = inet_diag_dump_compat,
1138 };
51d7cccf 1139 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
80d326fa 1140 }
1da177e4 1141 }
ead592ba 1142
fe50ce28 1143 return inet_diag_get_exact_compat(skb, nlh);
1da177e4
LT		 1144}
1145
6eb5d2e0 1146static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
d366477a 1147{
c8991362 1148 int hdrlen = sizeof(struct inet_diag_req_v2);
51d7cccf 1149 struct net *net = sock_net(skb->sk);
d366477a
PE		 1150
1151 if (nlmsg_len(h) < hdrlen)
1152 return -EINVAL;
1153
6eb5d2e0
LC		 1154 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1155 h->nlmsg_flags & NLM_F_DUMP) {
25c4cd2b
PE		 1156 if (nlmsg_attrlen(h, hdrlen)) {
1157 struct nlattr *attr;
627cc4ad 1158 int err;
e31c5e0e 1159
25c4cd2b
PE		 1160 attr = nlmsg_find_attr(h, hdrlen,
1161 INET_DIAG_REQ_BYTECODE);
a52e95ab 1162 err = inet_diag_bc_audit(attr, skb);
627cc4ad
LC		 1163 if (err)
1164 return err;
25c4cd2b 1165 }
80d326fa
PNA		 1166 {
1167 struct netlink_dump_control c = {
1168 .dump = inet_diag_dump,
1169 };
51d7cccf 1170 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
80d326fa 1171 }
d366477a
PE		 1172 }
1173
6eb5d2e0 1174 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
d366477a
PE		 1175}
1176
35ac838a
CG		 1177static
1178int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1179{
1180 const struct inet_diag_handler *handler;
1181 struct nlmsghdr *nlh;
1182 struct nlattr *attr;
1183 struct inet_diag_msg *r;
1184 void *info = NULL;
1185 int err = 0;
1186
1187 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1188 if (!nlh)
1189 return -ENOMEM;
1190
1191 r = nlmsg_data(nlh);
1192 memset(r, 0, sizeof(*r));
1193 inet_diag_msg_common_fill(r, sk);
e0df02e0
CG		 1194 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1195 r->id.idiag_sport = inet_sk(sk)->inet_sport;
35ac838a
CG		 1196 r->idiag_state = sk->sk_state;
1197
1198 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1199 nlmsg_cancel(skb, nlh);
1200 return err;
1201 }
1202
1203 handler = inet_diag_lock_handler(sk->sk_protocol);
1204 if (IS_ERR(handler)) {
1205 inet_diag_unlock_handler(handler);
1206 nlmsg_cancel(skb, nlh);
1207 return PTR_ERR(handler);
1208 }
1209
1210 attr = handler->idiag_info_size
6ed46d12
ND		 1211 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1212 handler->idiag_info_size,
1213 INET_DIAG_PAD)
35ac838a
CG		 1214 : NULL;
1215 if (attr)
1216 info = nla_data(attr);
1217
1218 handler->idiag_get_info(sk, r, info);
1219 inet_diag_unlock_handler(handler);
1220
1221 nlmsg_end(skb, nlh);
1222 return 0;
1223}
1224
8dcf01fc 1225static const struct sock_diag_handler inet_diag_handler = {
d366477a 1226 .family = AF_INET,
6eb5d2e0 1227 .dump = inet_diag_handler_cmd,
35ac838a 1228 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1229 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1230};
1231
8dcf01fc 1232static const struct sock_diag_handler inet6_diag_handler = {
d366477a 1233 .family = AF_INET6,
6eb5d2e0 1234 .dump = inet_diag_handler_cmd,
35ac838a 1235 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1236 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1237};
1238
4f5736c4
ACM		 1239int inet_diag_register(const struct inet_diag_handler *h)
1240{
1241 const __u16 type = h->idiag_type;
1242 int err = -EINVAL;
1243
f13c95f0 1244 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1245 goto out;
1246
d523a328 1247 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1248 err = -EEXIST;
e31c5e0e 1249 if (!inet_diag_table[type]) {
4f5736c4
ACM		 1250 inet_diag_table[type] = h;
1251 err = 0;
1252 }
d523a328 1253 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1254out:
1255 return err;
1256}
1257EXPORT_SYMBOL_GPL(inet_diag_register);
1258
1259void inet_diag_unregister(const struct inet_diag_handler *h)
1260{
1261 const __u16 type = h->idiag_type;
1262
f13c95f0 1263 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1264 return;
1265
d523a328 1266 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1267 inet_diag_table[type] = NULL;
d523a328 1268 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1269}
1270EXPORT_SYMBOL_GPL(inet_diag_unregister);
1271
73c1f4a0 1272static int __init inet_diag_init(void)
1da177e4 1273{
f13c95f0 1274 const int inet_diag_table_size = (IPPROTO_MAX *
4f5736c4
ACM		 1275 sizeof(struct inet_diag_handler *));
1276 int err = -ENOMEM;
1277
0da974f4 1278 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
4f5736c4
ACM		 1279 if (!inet_diag_table)
1280 goto out;
1281
d366477a
PE		 1282 err = sock_diag_register(&inet_diag_handler);
1283 if (err)
1284 goto out_free_nl;
1285
1286 err = sock_diag_register(&inet6_diag_handler);
1287 if (err)
1288 goto out_free_inet;
1289
8ef874bf 1290 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4
ACM		 1291out:
1292 return err;
d366477a
PE		 1293
1294out_free_inet:
1295 sock_diag_unregister(&inet_diag_handler);
1296out_free_nl:
4f5736c4
ACM		 1297 kfree(inet_diag_table);
1298 goto out;
1da177e4
LT		 1299}
1300
73c1f4a0 1301static void __exit inet_diag_exit(void)
1da177e4 1302{
d366477a
PE		 1303 sock_diag_unregister(&inet6_diag_handler);
1304 sock_diag_unregister(&inet_diag_handler);
8ef874bf 1305 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4 1306 kfree(inet_diag_table);
1da177e4
LT		 1307}
1308
73c1f4a0
ACM		 1309module_init(inet_diag_init);
1310module_exit(inet_diag_exit);
1da177e4 1311MODULE_LICENSE("GPL");
aec8dc62
PE		 1312MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1313MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux 6.x block layer and io_uring tree(s)