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Merge tag 'fixes-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux-block.git] / net / ipv4 / inet_diag.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 2/*
73c1f4a0 3 * inet_diag.c Module for monitoring INET transport protocols sockets.
1da177e4 4 *
1da177e4 5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
1da177e4
LT		 6 */
7
172589cc 8#include <linux/kernel.h>
1da177e4
LT		 9#include <linux/module.h>
10#include <linux/types.h>
11#include <linux/fcntl.h>
12#include <linux/random.h>
5a0e3ad6 13#include <linux/slab.h>
1da177e4
LT		 14#include <linux/cache.h>
15#include <linux/init.h>
16#include <linux/time.h>
17
18#include <net/icmp.h>
19#include <net/tcp.h>
20#include <net/ipv6.h>
21#include <net/inet_common.h>
505cbfc5
ACM		 22#include <net/inet_connection_sock.h>
23#include <net/inet_hashtables.h>
24#include <net/inet_timewait_sock.h>
25#include <net/inet6_hashtables.h>
085c20ca 26#include <net/bpf_sk_storage.h>
dc5fc579 27#include <net/netlink.h>
1da177e4
LT		 28
29#include <linux/inet.h>
30#include <linux/stddef.h>
31
a8c2190e 32#include <linux/inet_diag.h>
d366477a 33#include <linux/sock_diag.h>
1da177e4 34
4f5736c4
ACM		 35static const struct inet_diag_handler **inet_diag_table;
36
73c1f4a0 37struct inet_diag_entry {
e31c5e0e
ED		 38 const __be32 *saddr;
39 const __be32 *daddr;
1da177e4
LT		 40 u16 sport;
41 u16 dport;
42 u16 family;
43 u16 userlocks;
637c841d 44 u32 ifindex;
a52e95ab 45 u32 mark;
b1f3e43d
DY		 46#ifdef CONFIG_SOCK_CGROUP_DATA
47 u64 cgroup_id;
48#endif
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{
3f935c75
PA		 55 if (proto < 0 || proto >= IPPROTO_MAX) {
56 mutex_lock(&inet_diag_table_mutex);
57 return ERR_PTR(-ENOENT);
58 }
59
f13c95f0 60 if (!inet_diag_table[proto])
bf2ae2e4 61 sock_load_diag_module(AF_INET, proto);
d523a328
HX		 62
63 mutex_lock(&inet_diag_table_mutex);
f13c95f0 64 if (!inet_diag_table[proto])
d523a328
HX		 65 return ERR_PTR(-ENOENT);
66
f13c95f0 67 return inet_diag_table[proto];
d523a328
HX		 68}
69
e31c5e0e 70static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
d523a328
HX		 71{
72 mutex_unlock(&inet_diag_table_mutex);
73}
74
cb2050a7 75void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
a4458343
ED		 76{
77 r->idiag_family = sk->sk_family;
78
79 r->id.idiag_sport = htons(sk->sk_num);
80 r->id.idiag_dport = sk->sk_dport;
81 r->id.idiag_if = sk->sk_bound_dev_if;
82 sock_diag_save_cookie(sk, r->id.idiag_cookie);
83
84#if IS_ENABLED(CONFIG_IPV6)
85 if (sk->sk_family == AF_INET6) {
86 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
87 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
88 } else
89#endif
90 {
91 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
92 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
93
94 r->id.idiag_src[0] = sk->sk_rcv_saddr;
95 r->id.idiag_dst[0] = sk->sk_daddr;
96 }
97}
cb2050a7 98EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
a4458343 99
b37e8840
ID		 100static size_t inet_sk_attr_size(struct sock *sk,
101 const struct inet_diag_req_v2 *req,
102 bool net_admin)
c8e2c80d 103{
b37e8840
ID		 104 const struct inet_diag_handler *handler;
105 size_t aux = 0;
106
107 handler = inet_diag_table[req->sdiag_protocol];
108 if (handler && handler->idiag_get_aux_size)
109 aux = handler->idiag_get_aux_size(sk, net_admin);
110
c8e2c80d 111 return nla_total_size(sizeof(struct tcp_info))
c8e2c80d 112 + nla_total_size(sizeof(struct inet_diag_msg))
83f73c5b
DY		 113 + inet_diag_msg_attrs_size()
114 + nla_total_size(sizeof(struct inet_diag_meminfo))
c8e2c80d
ED		 115 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
116 + nla_total_size(TCP_CA_NAME_MAX)
117 + nla_total_size(sizeof(struct tcpvegas_info))
b37e8840 118 + aux
c8e2c80d
ED		 119 + 64;
120}
121
cb2050a7
XL		 122int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
123 struct inet_diag_msg *r, int ext,
d545caca
LC		 124 struct user_namespace *user_ns,
125 bool net_admin)
cb2050a7
XL		 126{
127 const struct inet_sock *inet = inet_sk(sk);
c1077616 128 struct inet_diag_sockopt inet_sockopt;
cb2050a7
XL		 129
130 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
131 goto errout;
132
133 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
134 * hence this needs to be included regardless of socket family.
135 */
136 if (ext & (1 << (INET_DIAG_TOS - 1)))
137 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
138 goto errout;
139
140#if IS_ENABLED(CONFIG_IPV6)
141 if (r->idiag_family == AF_INET6) {
142 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
143 if (nla_put_u8(skb, INET_DIAG_TCLASS,
144 inet6_sk(sk)->tclass) < 0)
145 goto errout;
146
147 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
148 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
149 goto errout;
150 }
151#endif
152
d545caca
LC		 153 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
154 goto errout;
155
83f73c5b
DY		 156 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
157 ext & (1 << (INET_DIAG_TCLASS - 1))) {
158 u32 classid = 0;
159
160#ifdef CONFIG_SOCK_CGROUP_DATA
161 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
162#endif
163 /* Fallback to socket priority if class id isn't set.
164 * Classful qdiscs use it as direct reference to class.
165 * For cgroup2 classid is always zero.
166 */
167 if (!classid)
168 classid = sk->sk_priority;
169
170 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
171 goto errout;
172 }
173
6e3a401f
DY		 174#ifdef CONFIG_SOCK_CGROUP_DATA
175 if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
176 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
177 INET_DIAG_PAD))
178 goto errout;
179#endif
180
cb2050a7
XL		 181 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
182 r->idiag_inode = sock_i_ino(sk);
183
c1077616
WW		 184 memset(&inet_sockopt, 0, sizeof(inet_sockopt));
185 inet_sockopt.recverr = inet->recverr;
186 inet_sockopt.is_icsk = inet->is_icsk;
187 inet_sockopt.freebind = inet->freebind;
188 inet_sockopt.hdrincl = inet->hdrincl;
189 inet_sockopt.mc_loop = inet->mc_loop;
190 inet_sockopt.transparent = inet->transparent;
191 inet_sockopt.mc_all = inet->mc_all;
192 inet_sockopt.nodefrag = inet->nodefrag;
193 inet_sockopt.bind_address_no_port = inet->bind_address_no_port;
194 inet_sockopt.recverr_rfc4884 = inet->recverr_rfc4884;
195 inet_sockopt.defer_connect = inet->defer_connect;
196 if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
197 &inet_sockopt))
198 goto errout;
199
cb2050a7
XL		 200 return 0;
201errout:
202 return 1;
203}
204EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
205
d5e4d0a5
ED		 206static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
207 struct nlattr **req_nlas)
3f935c75
PA		 208{
209 struct nlattr *nla;
210 int remaining;
211
212 nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
213 int type = nla_type(nla);
214
d5e4d0a5
ED		 215 if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
216 return -EINVAL;
217
3f935c75
PA		 218 if (type < __INET_DIAG_REQ_MAX)
219 req_nlas[type] = nla;
220 }
d5e4d0a5 221 return 0;
3f935c75
PA		 222}
223
224static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
225 const struct inet_diag_dump_data *data)
226{
227 if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
228 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
229 return req->sdiag_protocol;
230}
231
085c20ca
MKL		 232#define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
233
3c4d05c8 234int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
5682d393
MKL		 235 struct sk_buff *skb, struct netlink_callback *cb,
236 const struct inet_diag_req_v2 *req,
237 u16 nlmsg_flags, bool net_admin)
1da177e4 238{
521f1cf1 239 const struct tcp_congestion_ops *ca_ops;
e31c5e0e 240 const struct inet_diag_handler *handler;
085c20ca 241 struct inet_diag_dump_data *cb_data;
e31c5e0e 242 int ext = req->idiag_ext;
73c1f4a0 243 struct inet_diag_msg *r;
1da177e4 244 struct nlmsghdr *nlh;
6e277ed5 245 struct nlattr *attr;
4f5736c4 246 void *info = NULL;
4f5736c4 247
085c20ca 248 cb_data = cb->data;
3f935c75 249 handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)];
e31c5e0e 250 BUG_ON(!handler);
1da177e4 251
5682d393
MKL		 252 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
253 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
6e277ed5 254 if (!nlh)
d106352d 255 return -EMSGSIZE;
4f5736c4 256
d106352d 257 r = nlmsg_data(nlh);
a58917f5 258 BUG_ON(!sk_fullsock(sk));
c7d58aab 259
a4458343 260 inet_diag_msg_common_fill(r, sk);
73c1f4a0
ACM		 261 r->idiag_state = sk->sk_state;
262 r->idiag_timer = 0;
263 r->idiag_retrans = 0;
1da177e4 264
5682d393
MKL		 265 if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
266 sk_user_ns(NETLINK_CB(cb->skb).sk),
267 net_admin))
e4e541a8
PE		 268 goto errout;
269
6e277ed5
TG		 270 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
271 struct inet_diag_meminfo minfo = {
272 .idiag_rmem = sk_rmem_alloc_get(sk),
ab4e846a 273 .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
6e277ed5
TG		 274 .idiag_fmem = sk->sk_forward_alloc,
275 .idiag_tmem = sk_wmem_alloc_get(sk),
276 };
277
278 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
279 goto errout;
3c4d05c8
PE		 280 }
281
c0636faa
PE		 282 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
283 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
6e277ed5 284 goto errout;
c0636faa 285
432490f9
CG		 286 /*
287 * RAW sockets might have user-defined protocols assigned,
288 * so report the one supplied on socket creation.
289 */
290 if (sk->sk_type == SOCK_RAW) {
291 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
292 goto errout;
293 }
294
e31c5e0e 295 if (!icsk) {
62ad6fcd 296 handler->idiag_get_info(sk, r, NULL);
3c4d05c8
PE		 297 goto out;
298 }
299
6ba8a3b1 300 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
57dde7f7 301 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
6ba8a3b1 302 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
73c1f4a0
ACM		 303 r->idiag_timer = 1;
304 r->idiag_retrans = icsk->icsk_retransmits;
b7de529c 305 r->idiag_expires =
3828a93f 306 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
463c84b9 307 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
73c1f4a0
ACM		 308 r->idiag_timer = 4;
309 r->idiag_retrans = icsk->icsk_probes_out;
b7de529c 310 r->idiag_expires =
3828a93f 311 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
1da177e4 312 } else if (timer_pending(&sk->sk_timer)) {
73c1f4a0
ACM		 313 r->idiag_timer = 2;
314 r->idiag_retrans = icsk->icsk_probes_out;
b7de529c 315 r->idiag_expires =
3828a93f 316 jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
1da177e4 317 } else {
73c1f4a0
ACM		 318 r->idiag_timer = 0;
319 r->idiag_expires = 0;
1da177e4 320 }
540722ff 321
3fd22af8 322 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
6ed46d12
ND		 323 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
324 handler->idiag_info_size,
325 INET_DIAG_PAD);
6e277ed5
TG		 326 if (!attr)
327 goto errout;
3c4d05c8 328
6e277ed5 329 info = nla_data(attr);
1da177e4
LT		 330 }
331
521f1cf1
ED		 332 if (ext & (1 << (INET_DIAG_CONG - 1))) {
333 int err = 0;
334
335 rcu_read_lock();
336 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
337 if (ca_ops)
338 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
339 rcu_read_unlock();
340 if (err < 0)
6e277ed5 341 goto errout;
521f1cf1 342 }
6e277ed5 343
4f5736c4 344 handler->idiag_get_info(sk, r, info);
1da177e4 345
b37e8840
ID		 346 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
347 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
348 goto errout;
349
521f1cf1 350 if (sk->sk_state < TCP_TIME_WAIT) {
64f40ff5
ED		 351 union tcp_cc_info info;
352 size_t sz = 0;
353 int attr;
521f1cf1
ED		 354
355 rcu_read_lock();
356 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
357 if (ca_ops && ca_ops->get_info)
64f40ff5 358 sz = ca_ops->get_info(sk, ext, &attr, &info);
521f1cf1 359 rcu_read_unlock();
64f40ff5 360 if (sz && nla_put(skb, attr, sz, &info) < 0)
521f1cf1
ED		 361 goto errout;
362 }
1da177e4 363
085c20ca
MKL		 364 /* Keep it at the end for potential retry with a larger skb,
365 * or else do best-effort fitting, which is only done for the
366 * first_nlmsg.
367 */
368 if (cb_data->bpf_stg_diag) {
369 bool first_nlmsg = ((unsigned char *)nlh == skb->data);
370 unsigned int prev_min_dump_alloc;
371 unsigned int total_nla_size = 0;
372 unsigned int msg_len;
373 int err;
374
375 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
376 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
377 INET_DIAG_SK_BPF_STORAGES,
378 &total_nla_size);
379
380 if (!err)
381 goto out;
382
383 total_nla_size += msg_len;
384 prev_min_dump_alloc = cb->min_dump_alloc;
385 if (total_nla_size > prev_min_dump_alloc)
386 cb->min_dump_alloc = min_t(u32, total_nla_size,
387 MAX_DUMP_ALLOC_SIZE);
388
389 if (!first_nlmsg)
390 goto errout;
391
392 if (cb->min_dump_alloc > prev_min_dump_alloc)
393 /* Retry with pskb_expand_head() with
394 * __GFP_DIRECT_RECLAIM
395 */
396 goto errout;
397
398 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
399
400 /* Send what we have for this sk
401 * and move on to the next sk in the following
402 * dump()
403 */
404 }
405
3c4d05c8 406out:
053c095a
JB		 407 nlmsg_end(skb, nlh);
408 return 0;
1da177e4 409
6e277ed5
TG		 410errout:
411 nlmsg_cancel(skb, nlh);
26932566 412 return -EMSGSIZE;
1da177e4 413}
3c4d05c8
PE		 414EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
415
33cf7c90 416static int inet_twsk_diag_fill(struct sock *sk,
e31c5e0e 417 struct sk_buff *skb,
5682d393
MKL		 418 struct netlink_callback *cb,
419 u16 nlmsg_flags)
c7d58aab 420{
33cf7c90 421 struct inet_timewait_sock *tw = inet_twsk(sk);
c7d58aab 422 struct inet_diag_msg *r;
6e277ed5 423 struct nlmsghdr *nlh;
789f558c 424 long tmo;
d106352d 425
5682d393
MKL		 426 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
427 cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
428 sizeof(*r), nlmsg_flags);
6e277ed5 429 if (!nlh)
d106352d 430 return -EMSGSIZE;
c7d58aab 431
d106352d 432 r = nlmsg_data(nlh);
c7d58aab
ACM		 433 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
434
a4458343 435 inet_diag_msg_common_fill(r, sk);
c7d58aab 436 r->idiag_retrans = 0;
b1aac815 437
c7d58aab
ACM		 438 r->idiag_state = tw->tw_substate;
439 r->idiag_timer = 3;
3828a93f
ED		 440 tmo = tw->tw_timer.expires - jiffies;
441 r->idiag_expires = jiffies_delta_to_msecs(tmo);
c7d58aab
ACM		 442 r->idiag_rqueue = 0;
443 r->idiag_wqueue = 0;
444 r->idiag_uid = 0;
445 r->idiag_inode = 0;
6e277ed5 446
053c095a
JB		 447 nlmsg_end(skb, nlh);
448 return 0;
c7d58aab
ACM		 449}
450
a58917f5 451static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
5682d393
MKL		 452 struct netlink_callback *cb,
453 u16 nlmsg_flags, bool net_admin)
a58917f5 454{
d545caca 455 struct request_sock *reqsk = inet_reqsk(sk);
a58917f5
ED		 456 struct inet_diag_msg *r;
457 struct nlmsghdr *nlh;
458 long tmo;
459
5682d393
MKL		 460 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
461 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
a58917f5
ED		 462 if (!nlh)
463 return -EMSGSIZE;
464
465 r = nlmsg_data(nlh);
466 inet_diag_msg_common_fill(r, sk);
467 r->idiag_state = TCP_SYN_RECV;
468 r->idiag_timer = 1;
d545caca 469 r->idiag_retrans = reqsk->num_retrans;
a58917f5
ED		 470
471 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
472 offsetof(struct sock, sk_cookie));
473
fa76ce73 474 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
3828a93f 475 r->idiag_expires = jiffies_delta_to_msecs(tmo);
a58917f5
ED		 476 r->idiag_rqueue = 0;
477 r->idiag_wqueue = 0;
478 r->idiag_uid = 0;
479 r->idiag_inode = 0;
480
d545caca 481 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
e33de7c5
WH		 482 inet_rsk(reqsk)->ir_mark)) {
483 nlmsg_cancel(skb, nlh);
d545caca 484 return -EMSGSIZE;
e33de7c5 485 }
d545caca 486
a58917f5
ED		 487 nlmsg_end(skb, nlh);
488 return 0;
489}
490
dff2c035 491static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
5682d393 492 struct netlink_callback *cb,
34160ea3 493 const struct inet_diag_req_v2 *r,
5682d393 494 u16 nlmsg_flags, bool net_admin)
dff2c035
ACM		 495{
496 if (sk->sk_state == TCP_TIME_WAIT)
5682d393 497 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags);
efe4208f 498
a58917f5 499 if (sk->sk_state == TCP_NEW_SYN_RECV)
5682d393 500 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
a58917f5 501
5682d393
MKL		 502 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
503 net_admin);
dff2c035
ACM		 504}
505
b613f56e
LC		 506struct sock *inet_diag_find_one_icsk(struct net *net,
507 struct inet_hashinfo *hashinfo,
508 const struct inet_diag_req_v2 *req)
1da177e4 509{
e31c5e0e 510 struct sock *sk;
d523a328 511
2d331915 512 rcu_read_lock();
e31c5e0e 513 if (req->sdiag_family == AF_INET)
a583636a 514 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
73c1f4a0
ACM		 515 req->id.idiag_dport, req->id.idiag_src[0],
516 req->id.idiag_sport, req->id.idiag_if);
dfd56b8b 517#if IS_ENABLED(CONFIG_IPV6)
7c130672
ED		 518 else if (req->sdiag_family == AF_INET6) {
519 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
520 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
a583636a 521 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
7c130672
ED		 522 req->id.idiag_dport, req->id.idiag_src[3],
523 req->id.idiag_sport, req->id.idiag_if);
524 else
a583636a 525 sk = inet6_lookup(net, hashinfo, NULL, 0,
7c130672
ED		 526 (struct in6_addr *)req->id.idiag_dst,
527 req->id.idiag_dport,
528 (struct in6_addr *)req->id.idiag_src,
529 req->id.idiag_sport,
530 req->id.idiag_if);
531 }
1da177e4 532#endif
2d331915
ED		 533 else {
534 rcu_read_unlock();
b613f56e 535 return ERR_PTR(-EINVAL);
2d331915
ED		 536 }
537 rcu_read_unlock();
e31c5e0e 538 if (!sk)
b613f56e 539 return ERR_PTR(-ENOENT);
1da177e4 540
b613f56e
LC		 541 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
542 sock_gen_put(sk);
543 return ERR_PTR(-ENOENT);
544 }
545
546 return sk;
547}
548EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
549
550int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
5682d393 551 struct netlink_callback *cb,
b613f56e
LC		 552 const struct inet_diag_req_v2 *req)
553{
5682d393 554 struct sk_buff *in_skb = cb->skb;
b37e8840 555 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
b613f56e
LC		 556 struct net *net = sock_net(in_skb->sk);
557 struct sk_buff *rep;
558 struct sock *sk;
559 int err;
560
561 sk = inet_diag_find_one_icsk(net, hashinfo, req);
562 if (IS_ERR(sk))
563 return PTR_ERR(sk);
1da177e4 564
b37e8840 565 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
6e277ed5
TG		 566 if (!rep) {
567 err = -ENOMEM;
1da177e4 568 goto out;
6e277ed5 569 }
1da177e4 570
5682d393 571 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
26932566
PM		 572 if (err < 0) {
573 WARN_ON(err == -EMSGSIZE);
6e277ed5 574 nlmsg_free(rep);
26932566
PM		 575 goto out;
576 }
15e47304 577 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
73c1f4a0 578 MSG_DONTWAIT);
1da177e4
LT		 579 if (err > 0)
580 err = 0;
581
582out:
c1d607cc
ED		 583 if (sk)
584 sock_gen_put(sk);
585
476f7dbf
PE		 586 return err;
587}
1942c518 588EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
476f7dbf 589
6eb5d2e0 590static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
476f7dbf 591 const struct nlmsghdr *nlh,
3f935c75 592 int hdrlen,
34160ea3 593 const struct inet_diag_req_v2 *req)
476f7dbf
PE		 594{
595 const struct inet_diag_handler *handler;
3f935c75
PA		 596 struct inet_diag_dump_data dump_data;
597 int err, protocol;
598
599 memset(&dump_data, 0, sizeof(dump_data));
d5e4d0a5
ED		 600 err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
601 if (err)
602 return err;
603
3f935c75 604 protocol = inet_diag_get_protocol(req, &dump_data);
476f7dbf 605
3f935c75 606 handler = inet_diag_lock_handler(protocol);
5682d393 607 if (IS_ERR(handler)) {
476f7dbf 608 err = PTR_ERR(handler);
5682d393
MKL		 609 } else if (cmd == SOCK_DIAG_BY_FAMILY) {
610 struct netlink_callback cb = {
611 .nlh = nlh,
612 .skb = in_skb,
3f935c75 613 .data = &dump_data,
5682d393
MKL		 614 };
615 err = handler->dump_one(&cb, req);
616 } else if (cmd == SOCK_DESTROY && handler->destroy) {
6eb5d2e0 617 err = handler->destroy(in_skb, req);
5682d393 618 } else {
6eb5d2e0 619 err = -EOPNOTSUPP;
5682d393 620 }
d523a328 621 inet_diag_unlock_handler(handler);
476f7dbf 622
1da177e4
LT		 623 return err;
624}
625
9f855299 626static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
1da177e4
LT		 627{
628 int words = bits >> 5;
629
630 bits &= 0x1f;
631
632 if (words) {
633 if (memcmp(a1, a2, words << 2))
634 return 0;
635 }
636 if (bits) {
9f855299
AV		 637 __be32 w1, w2;
638 __be32 mask;
1da177e4
LT		 639
640 w1 = a1[words];
641 w2 = a2[words];
642
643 mask = htonl((0xffffffff) << (32 - bits));
644
645 if ((w1 ^ w2) & mask)
646 return 0;
647 }
648
649 return 1;
650}
651
87c22ea5 652static int inet_diag_bc_run(const struct nlattr *_bc,
e31c5e0e 653 const struct inet_diag_entry *entry)
1da177e4 654{
87c22ea5
PE		 655 const void *bc = nla_data(_bc);
656 int len = nla_len(_bc);
657
1da177e4
LT		 658 while (len > 0) {
659 int yes = 1;
73c1f4a0 660 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 661
662 switch (op->code) {
73c1f4a0 663 case INET_DIAG_BC_NOP:
1da177e4 664 break;
73c1f4a0 665 case INET_DIAG_BC_JMP:
1da177e4
LT		 666 yes = 0;
667 break;
bbb6189d
KE		 668 case INET_DIAG_BC_S_EQ:
669 yes = entry->sport == op[1].no;
670 break;
73c1f4a0 671 case INET_DIAG_BC_S_GE:
1da177e4
LT		 672 yes = entry->sport >= op[1].no;
673 break;
73c1f4a0 674 case INET_DIAG_BC_S_LE:
b4ced2b7 675 yes = entry->sport <= op[1].no;
1da177e4 676 break;
bbb6189d
KE		 677 case INET_DIAG_BC_D_EQ:
678 yes = entry->dport == op[1].no;
679 break;
73c1f4a0 680 case INET_DIAG_BC_D_GE:
1da177e4
LT		 681 yes = entry->dport >= op[1].no;
682 break;
73c1f4a0 683 case INET_DIAG_BC_D_LE:
1da177e4
LT		 684 yes = entry->dport <= op[1].no;
685 break;
73c1f4a0 686 case INET_DIAG_BC_AUTO:
1da177e4
LT		 687 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
688 break;
73c1f4a0 689 case INET_DIAG_BC_S_COND:
a8c2190e 690 case INET_DIAG_BC_D_COND: {
e31c5e0e
ED		 691 const struct inet_diag_hostcond *cond;
692 const __be32 *addr;
1da177e4 693
e31c5e0e 694 cond = (const struct inet_diag_hostcond *)(op + 1);
1da177e4 695 if (cond->port != -1 &&
73c1f4a0 696 cond->port != (op->code == INET_DIAG_BC_S_COND ?
1da177e4
LT		 697 entry->sport : entry->dport)) {
698 yes = 0;
699 break;
700 }
4e852c02 701
73c1f4a0 702 if (op->code == INET_DIAG_BC_S_COND)
1da177e4
LT		 703 addr = entry->saddr;
704 else
705 addr = entry->daddr;
706
f67caec9
NC		 707 if (cond->family != AF_UNSPEC &&
708 cond->family != entry->family) {
709 if (entry->family == AF_INET6 &&
710 cond->family == AF_INET) {
711 if (addr[0] == 0 && addr[1] == 0 &&
712 addr[2] == htonl(0xffff) &&
713 bitstring_match(addr + 3,
714 cond->addr,
715 cond->prefix_len))
716 break;
717 }
718 yes = 0;
719 break;
720 }
721
722 if (cond->prefix_len == 0)
723 break;
4e852c02
ACM		 724 if (bitstring_match(addr, cond->addr,
725 cond->prefix_len))
1da177e4 726 break;
1da177e4
LT		 727 yes = 0;
728 break;
729 }
637c841d
DA		 730 case INET_DIAG_BC_DEV_COND: {
731 u32 ifindex;
732
733 ifindex = *((const u32 *)(op + 1));
734 if (ifindex != entry->ifindex)
735 yes = 0;
736 break;
737 }
a52e95ab
LC		 738 case INET_DIAG_BC_MARK_COND: {
739 struct inet_diag_markcond *cond;
740
741 cond = (struct inet_diag_markcond *)(op + 1);
742 if ((entry->mark & cond->mask) != cond->mark)
743 yes = 0;
744 break;
745 }
b1f3e43d
DY		 746#ifdef CONFIG_SOCK_CGROUP_DATA
747 case INET_DIAG_BC_CGROUP_COND: {
748 u64 cgroup_id;
749
750 cgroup_id = get_unaligned((const u64 *)(op + 1));
751 if (cgroup_id != entry->cgroup_id)
752 yes = 0;
753 break;
754 }
755#endif
1da177e4
LT		 756 }
757
4e852c02 758 if (yes) {
1da177e4
LT		 759 len -= op->yes;
760 bc += op->yes;
761 } else {
762 len -= op->no;
763 bc += op->no;
764 }
765 }
a02cec21 766 return len == 0;
1da177e4
LT		 767}
768
a4458343
ED		 769/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
770 */
771static void entry_fill_addrs(struct inet_diag_entry *entry,
772 const struct sock *sk)
773{
774#if IS_ENABLED(CONFIG_IPV6)
775 if (sk->sk_family == AF_INET6) {
776 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
777 entry->daddr = sk->sk_v6_daddr.s6_addr32;
778 } else
779#endif
780 {
781 entry->saddr = &sk->sk_rcv_saddr;
782 entry->daddr = &sk->sk_daddr;
783 }
784}
785
8d07d151
PE		 786int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
787{
8d07d151 788 struct inet_sock *inet = inet_sk(sk);
e31c5e0e 789 struct inet_diag_entry entry;
8d07d151 790
e31c5e0e 791 if (!bc)
8d07d151
PE		 792 return 1;
793
794 entry.family = sk->sk_family;
a4458343 795 entry_fill_addrs(&entry, sk);
8d07d151
PE		 796 entry.sport = inet->inet_num;
797 entry.dport = ntohs(inet->inet_dport);
637c841d 798 entry.ifindex = sk->sk_bound_dev_if;
a58917f5 799 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
a52e95ab
LC		 800 if (sk_fullsock(sk))
801 entry.mark = sk->sk_mark;
802 else if (sk->sk_state == TCP_NEW_SYN_RECV)
803 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
804 else
805 entry.mark = 0;
b1f3e43d 806#ifdef CONFIG_SOCK_CGROUP_DATA
ee1bd483
DY		 807 entry.cgroup_id = sk_fullsock(sk) ?
808 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
b1f3e43d 809#endif
8d07d151
PE		 810
811 return inet_diag_bc_run(bc, &entry);
812}
813EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
814
1da177e4
LT		 815static int valid_cc(const void *bc, int len, int cc)
816{
817 while (len >= 0) {
73c1f4a0 818 const struct inet_diag_bc_op *op = bc;
1da177e4
LT		 819
820 if (cc > len)
821 return 0;
822 if (cc == len)
823 return 1;
eeb14972 824 if (op->yes < 4 || op->yes & 3)
1da177e4
LT		 825 return 0;
826 len -= op->yes;
827 bc += op->yes;
828 }
829 return 0;
830}
831
637c841d
DA		 832/* data is u32 ifindex */
833static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
834 int *min_len)
835{
836 /* Check ifindex space. */
837 *min_len += sizeof(u32);
838 if (len < *min_len)
839 return false;
840
841 return true;
842}
405c0059
NC		 843/* Validate an inet_diag_hostcond. */
844static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
845 int *min_len)
846{
405c0059 847 struct inet_diag_hostcond *cond;
e31c5e0e 848 int addr_len;
405c0059
NC		 849
850 /* Check hostcond space. */
851 *min_len += sizeof(struct inet_diag_hostcond);
852 if (len < *min_len)
853 return false;
854 cond = (struct inet_diag_hostcond *)(op + 1);
855
856 /* Check address family and address length. */
857 switch (cond->family) {
858 case AF_UNSPEC:
859 addr_len = 0;
860 break;
861 case AF_INET:
862 addr_len = sizeof(struct in_addr);
863 break;
864 case AF_INET6:
865 addr_len = sizeof(struct in6_addr);
866 break;
867 default:
868 return false;
869 }
870 *min_len += addr_len;
871 if (len < *min_len)
872 return false;
873
874 /* Check prefix length (in bits) vs address length (in bytes). */
875 if (cond->prefix_len > 8 * addr_len)
876 return false;
877
878 return true;
879}
880
5e1f5420 881/* Validate a port comparison operator. */
e31c5e0e
ED		 882static bool valid_port_comparison(const struct inet_diag_bc_op *op,
883 int len, int *min_len)
5e1f5420
NC		 884{
885 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
886 *min_len += sizeof(struct inet_diag_bc_op);
887 if (len < *min_len)
888 return false;
889 return true;
890}
891
a52e95ab
LC		 892static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
893 int *min_len)
1da177e4 894{
a52e95ab
LC		 895 *min_len += sizeof(struct inet_diag_markcond);
896 return len >= *min_len;
897}
898
b1f3e43d
DY		 899#ifdef CONFIG_SOCK_CGROUP_DATA
900static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
901 int *min_len)
902{
903 *min_len += sizeof(u64);
904 return len >= *min_len;
905}
906#endif
907
a52e95ab
LC		 908static int inet_diag_bc_audit(const struct nlattr *attr,
909 const struct sk_buff *skb)
910{
911 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
627cc4ad
LC		 912 const void *bytecode, *bc;
913 int bytecode_len, len;
914
915 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
916 return -EINVAL;
917
918 bytecode = bc = nla_data(attr);
919 len = bytecode_len = nla_len(attr);
1da177e4
LT		 920
921 while (len > 0) {
405c0059 922 int min_len = sizeof(struct inet_diag_bc_op);
e31c5e0e 923 const struct inet_diag_bc_op *op = bc;
1da177e4 924
1da177e4 925 switch (op->code) {
73c1f4a0
ACM		 926 case INET_DIAG_BC_S_COND:
927 case INET_DIAG_BC_D_COND:
405c0059
NC		 928 if (!valid_hostcond(bc, len, &min_len))
929 return -EINVAL;
5e1f5420 930 break;
637c841d
DA		 931 case INET_DIAG_BC_DEV_COND:
932 if (!valid_devcond(bc, len, &min_len))
933 return -EINVAL;
934 break;
bbb6189d 935 case INET_DIAG_BC_S_EQ:
73c1f4a0
ACM		 936 case INET_DIAG_BC_S_GE:
937 case INET_DIAG_BC_S_LE:
bbb6189d 938 case INET_DIAG_BC_D_EQ:
73c1f4a0
ACM		 939 case INET_DIAG_BC_D_GE:
940 case INET_DIAG_BC_D_LE:
5e1f5420 941 if (!valid_port_comparison(bc, len, &min_len))
1da177e4
LT		 942 return -EINVAL;
943 break;
a52e95ab
LC		 944 case INET_DIAG_BC_MARK_COND:
945 if (!net_admin)
946 return -EPERM;
947 if (!valid_markcond(bc, len, &min_len))
948 return -EINVAL;
949 break;
b1f3e43d
DY		 950#ifdef CONFIG_SOCK_CGROUP_DATA
951 case INET_DIAG_BC_CGROUP_COND:
952 if (!valid_cgroupcond(bc, len, &min_len))
953 return -EINVAL;
954 break;
955#endif
5e1f5420
NC		 956 case INET_DIAG_BC_AUTO:
957 case INET_DIAG_BC_JMP:
73c1f4a0 958 case INET_DIAG_BC_NOP:
1da177e4
LT		 959 break;
960 default:
961 return -EINVAL;
962 }
5e1f5420
NC		 963
964 if (op->code != INET_DIAG_BC_NOP) {
965 if (op->no < min_len || op->no > len + 4 || op->no & 3)
966 return -EINVAL;
967 if (op->no < len &&
968 !valid_cc(bytecode, bytecode_len, len - op->no))
969 return -EINVAL;
970 }
971
405c0059 972 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
eeb14972 973 return -EINVAL;
4e852c02 974 bc += op->yes;
1da177e4
LT		 975 len -= op->yes;
976 }
977 return len == 0 ? 0 : -EINVAL;
978}
979
49612729
ED		 980static void twsk_build_assert(void)
981{
982 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
983 offsetof(struct sock, sk_family));
984
985 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
986 offsetof(struct inet_sock, inet_num));
987
988 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
989 offsetof(struct inet_sock, inet_dport));
990
991 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
992 offsetof(struct inet_sock, inet_rcv_saddr));
993
994 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
995 offsetof(struct inet_sock, inet_daddr));
996
997#if IS_ENABLED(CONFIG_IPV6)
998 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
999 offsetof(struct sock, sk_v6_rcv_saddr));
1000
1001 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1002 offsetof(struct sock, sk_v6_daddr));
1003#endif
1004}
1005
1942c518 1006void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
e31c5e0e 1007 struct netlink_callback *cb,
0df6d328 1008 const struct inet_diag_req_v2 *r)
1da177e4 1009{
67db3e4b 1010 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
0df6d328 1011 struct inet_diag_dump_data *cb_data = cb->data;
51d7cccf 1012 struct net *net = sock_net(skb->sk);
079096f1 1013 u32 idiag_states = r->idiag_states;
67db3e4b 1014 int i, num, s_i, s_num;
0df6d328 1015 struct nlattr *bc;
67db3e4b 1016 struct sock *sk;
4e852c02 1017
0df6d328 1018 bc = cb_data->inet_diag_nla_bc;
079096f1
ED		 1019 if (idiag_states & TCPF_SYN_RECV)
1020 idiag_states |= TCPF_NEW_SYN_RECV;
1da177e4
LT		 1021 s_i = cb->args[1];
1022 s_num = num = cb->args[2];
4f5736c4 1023
1da177e4 1024 if (cb->args[0] == 0) {
9652dc2e 1025 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1da177e4 1026 goto skip_listen_ht;
540722ff 1027
0f7ff927 1028 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
5caea4ea 1029 struct inet_listen_hashbucket *ilb;
8dbd76e7 1030 struct hlist_nulls_node *node;
1da177e4
LT		 1031
1032 num = 0;
5caea4ea 1033 ilb = &hashinfo->listening_hash[i];
9652dc2e 1034 spin_lock(&ilb->lock);
8dbd76e7 1035 sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1da177e4
LT		 1036 struct inet_sock *inet = inet_sk(sk);
1037
51d7cccf
AV		 1038 if (!net_eq(sock_net(sk), net))
1039 continue;
1040
1da177e4
LT		 1041 if (num < s_num) {
1042 num++;
1043 continue;
1044 }
1045
d23deaa0 1046 if (r->sdiag_family != AF_UNSPEC &&
e31c5e0e 1047 sk->sk_family != r->sdiag_family)
d23deaa0
PE		 1048 goto next_listen;
1049
c720c7e8 1050 if (r->id.idiag_sport != inet->inet_sport &&
73c1f4a0 1051 r->id.idiag_sport)
1da177e4
LT		 1052 goto next_listen;
1053
5682d393
MKL		 1054 if (!inet_diag_bc_sk(bc, sk))
1055 goto next_listen;
1056
1057 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1058 cb, r, NLM_F_MULTI,
1059 net_admin) < 0) {
9652dc2e 1060 spin_unlock(&ilb->lock);
1da177e4
LT		 1061 goto done;
1062 }
1063
1064next_listen:
1da177e4
LT		 1065 ++num;
1066 }
9652dc2e 1067 spin_unlock(&ilb->lock);
1da177e4
LT		 1068
1069 s_num = 0;
1da177e4 1070 }
1da177e4
LT		 1071skip_listen_ht:
1072 cb->args[0] = 1;
1073 s_i = num = s_num = 0;
1074 }
1075
079096f1 1076 if (!(idiag_states & ~TCPF_LISTEN))
efb3cb42 1077 goto out;
1da177e4 1078
67db3e4b 1079#define SKARR_SZ 16
f373b53b 1080 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
540722ff 1081 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
7e3aab4a 1082 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
3ab5aee7 1083 struct hlist_nulls_node *node;
67db3e4b
ED		 1084 struct sock *sk_arr[SKARR_SZ];
1085 int num_arr[SKARR_SZ];
1086 int idx, accum, res;
6be547a6 1087
05dbc7b5 1088 if (hlist_nulls_empty(&head->chain))
6be547a6
AK		 1089 continue;
1090
1da177e4
LT		 1091 if (i > s_i)
1092 s_num = 0;
1093
67db3e4b
ED		 1094next_chunk:
1095 num = 0;
1096 accum = 0;
7e3aab4a 1097 spin_lock_bh(lock);
3ab5aee7 1098 sk_nulls_for_each(sk, node, &head->chain) {
67db3e4b 1099 int state;
1da177e4 1100
51d7cccf
AV		 1101 if (!net_eq(sock_net(sk), net))
1102 continue;
1da177e4
LT		 1103 if (num < s_num)
1104 goto next_normal;
70315d22
NC		 1105 state = (sk->sk_state == TCP_TIME_WAIT) ?
1106 inet_twsk(sk)->tw_substate : sk->sk_state;
079096f1 1107 if (!(idiag_states & (1 << state)))
1da177e4 1108 goto next_normal;
d23deaa0 1109 if (r->sdiag_family != AF_UNSPEC &&
05dbc7b5 1110 sk->sk_family != r->sdiag_family)
d23deaa0 1111 goto next_normal;
05dbc7b5 1112 if (r->id.idiag_sport != htons(sk->sk_num) &&
73c1f4a0 1113 r->id.idiag_sport)
1da177e4 1114 goto next_normal;
05dbc7b5 1115 if (r->id.idiag_dport != sk->sk_dport &&
4e852c02 1116 r->id.idiag_dport)
1da177e4 1117 goto next_normal;
a58917f5
ED		 1118 twsk_build_assert();
1119
1120 if (!inet_diag_bc_sk(bc, sk))
1121 goto next_normal;
1122
f0c928d8
ED		 1123 if (!refcount_inc_not_zero(&sk->sk_refcnt))
1124 goto next_normal;
1125
67db3e4b
ED		 1126 num_arr[accum] = num;
1127 sk_arr[accum] = sk;
1128 if (++accum == SKARR_SZ)
1129 break;
1130next_normal:
1131 ++num;
1132 }
1133 spin_unlock_bh(lock);
1134 res = 0;
1135 for (idx = 0; idx < accum; idx++) {
1136 if (res >= 0) {
5682d393
MKL		 1137 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1138 NLM_F_MULTI, net_admin);
67db3e4b
ED		 1139 if (res < 0)
1140 num = num_arr[idx];
1da177e4 1141 }
67db3e4b 1142 sock_gen_put(sk_arr[idx]);
1da177e4 1143 }
67db3e4b
ED		 1144 if (res < 0)
1145 break;
acffb584 1146 cond_resched();
67db3e4b
ED		 1147 if (accum == SKARR_SZ) {
1148 s_num = num + 1;
1149 goto next_chunk;
1150 }
1da177e4
LT		 1151 }
1152
1153done:
1154 cb->args[1] = i;
1155 cb->args[2] = num;
efb3cb42
PE		 1156out:
1157 ;
1158}
1942c518 1159EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
efb3cb42
PE		 1160
1161static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
0df6d328 1162 const struct inet_diag_req_v2 *r)
efb3cb42 1163{
3f935c75 1164 struct inet_diag_dump_data *cb_data = cb->data;
efb3cb42 1165 const struct inet_diag_handler *handler;
085c20ca 1166 u32 prev_min_dump_alloc;
3f935c75
PA		 1167 int protocol, err = 0;
1168
1169 protocol = inet_diag_get_protocol(r, cb_data);
efb3cb42 1170
085c20ca
MKL		 1171again:
1172 prev_min_dump_alloc = cb->min_dump_alloc;
3f935c75 1173 handler = inet_diag_lock_handler(protocol);
efb3cb42 1174 if (!IS_ERR(handler))
0df6d328 1175 handler->dump(skb, cb, r);
cacb6ba0
CG		 1176 else
1177 err = PTR_ERR(handler);
d523a328 1178 inet_diag_unlock_handler(handler);
efb3cb42 1179
085c20ca
MKL		 1180 /* The skb is not large enough to fit one sk info and
1181 * inet_sk_diag_fill() has requested for a larger skb.
1182 */
1183 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1184 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1185 if (!err)
1186 goto again;
1187 }
1188
cacb6ba0 1189 return err ? : skb->len;
1da177e4
LT		 1190}
1191
25c4cd2b
PE		 1192static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1193{
0df6d328
MKL		 1194 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1195}
1196
1197static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1198{
1199 const struct nlmsghdr *nlh = cb->nlh;
1200 struct inet_diag_dump_data *cb_data;
1201 struct sk_buff *skb = cb->skb;
1202 struct nlattr *nla;
3f935c75 1203 int err;
0df6d328
MKL		 1204
1205 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1206 if (!cb_data)
1207 return -ENOMEM;
1208
d5e4d0a5
ED		 1209 err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1210 if (err) {
1211 kfree(cb_data);
1212 return err;
1213 }
0df6d328
MKL		 1214 nla = cb_data->inet_diag_nla_bc;
1215 if (nla) {
1216 err = inet_diag_bc_audit(nla, skb);
1217 if (err) {
1218 kfree(cb_data);
1219 return err;
1220 }
1221 }
25c4cd2b 1222
085c20ca
MKL		 1223 nla = cb_data->inet_diag_nla_bpf_stgs;
1224 if (nla) {
1225 struct bpf_sk_storage_diag *bpf_stg_diag;
1226
1227 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1228 if (IS_ERR(bpf_stg_diag)) {
1229 kfree(cb_data);
1230 return PTR_ERR(bpf_stg_diag);
1231 }
1232 cb_data->bpf_stg_diag = bpf_stg_diag;
1233 }
1234
0df6d328
MKL		 1235 cb->data = cb_data;
1236 return 0;
1237}
25c4cd2b 1238
0df6d328
MKL		 1239static int inet_diag_dump_start(struct netlink_callback *cb)
1240{
1241 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1242}
1243
1244static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1245{
1246 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1247}
1248
1249static int inet_diag_dump_done(struct netlink_callback *cb)
1250{
085c20ca
MKL		 1251 struct inet_diag_dump_data *cb_data = cb->data;
1252
1253 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
0df6d328
MKL		 1254 kfree(cb->data);
1255
1256 return 0;
25c4cd2b
PE		 1257}
1258
e31c5e0e 1259static int inet_diag_type2proto(int type)
a029fe26
PE		 1260{
1261 switch (type) {
1262 case TCPDIAG_GETSOCK:
1263 return IPPROTO_TCP;
1264 case DCCPDIAG_GETSOCK:
1265 return IPPROTO_DCCP;
1266 default:
1267 return 0;
1268 }
1269}
1270
e31c5e0e
ED		 1271static int inet_diag_dump_compat(struct sk_buff *skb,
1272 struct netlink_callback *cb)
25c4cd2b 1273{
d106352d 1274 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
c8991362 1275 struct inet_diag_req_v2 req;
25c4cd2b 1276
d23deaa0 1277 req.sdiag_family = AF_UNSPEC; /* compatibility */
25c4cd2b
PE		 1278 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1279 req.idiag_ext = rc->idiag_ext;
1280 req.idiag_states = rc->idiag_states;
1281 req.id = rc->id;
1282
0df6d328 1283 return __inet_diag_dump(skb, cb, &req);
25c4cd2b
PE		 1284}
1285
fe50ce28 1286static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
e31c5e0e 1287 const struct nlmsghdr *nlh)
fe50ce28 1288{
d106352d 1289 struct inet_diag_req *rc = nlmsg_data(nlh);
c8991362 1290 struct inet_diag_req_v2 req;
fe50ce28
PE		 1291
1292 req.sdiag_family = rc->idiag_family;
1293 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1294 req.idiag_ext = rc->idiag_ext;
1295 req.idiag_states = rc->idiag_states;
1296 req.id = rc->id;
1297
3f935c75
PA		 1298 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1299 sizeof(struct inet_diag_req), &req);
fe50ce28
PE		 1300}
1301
8d34172d 1302static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 1303{
3b09c84c 1304 int hdrlen = sizeof(struct inet_diag_req);
51d7cccf 1305 struct net *net = sock_net(skb->sk);
1da177e4 1306
ead592ba
TG		 1307 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1308 nlmsg_len(nlh) < hdrlen)
1309 return -EINVAL;
1da177e4 1310
b8f3ab42 1311 if (nlh->nlmsg_flags & NLM_F_DUMP) {
0df6d328
MKL		 1312 struct netlink_dump_control c = {
1313 .start = inet_diag_dump_start_compat,
1314 .done = inet_diag_dump_done,
1315 .dump = inet_diag_dump_compat,
1316 };
1317 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1da177e4 1318 }
ead592ba 1319
fe50ce28 1320 return inet_diag_get_exact_compat(skb, nlh);
1da177e4
LT		 1321}
1322
6eb5d2e0 1323static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
d366477a 1324{
c8991362 1325 int hdrlen = sizeof(struct inet_diag_req_v2);
51d7cccf 1326 struct net *net = sock_net(skb->sk);
d366477a
PE		 1327
1328 if (nlmsg_len(h) < hdrlen)
1329 return -EINVAL;
1330
6eb5d2e0
LC		 1331 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1332 h->nlmsg_flags & NLM_F_DUMP) {
0df6d328
MKL		 1333 struct netlink_dump_control c = {
1334 .start = inet_diag_dump_start,
1335 .done = inet_diag_dump_done,
1336 .dump = inet_diag_dump,
1337 };
1338 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
d366477a
PE		 1339 }
1340
3f935c75
PA		 1341 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1342 nlmsg_data(h));
d366477a
PE		 1343}
1344
35ac838a
CG		 1345static
1346int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1347{
1348 const struct inet_diag_handler *handler;
1349 struct nlmsghdr *nlh;
1350 struct nlattr *attr;
1351 struct inet_diag_msg *r;
1352 void *info = NULL;
1353 int err = 0;
1354
1355 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1356 if (!nlh)
1357 return -ENOMEM;
1358
1359 r = nlmsg_data(nlh);
1360 memset(r, 0, sizeof(*r));
1361 inet_diag_msg_common_fill(r, sk);
e0df02e0
CG		 1362 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1363 r->id.idiag_sport = inet_sk(sk)->inet_sport;
35ac838a
CG		 1364 r->idiag_state = sk->sk_state;
1365
1366 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1367 nlmsg_cancel(skb, nlh);
1368 return err;
1369 }
1370
1371 handler = inet_diag_lock_handler(sk->sk_protocol);
1372 if (IS_ERR(handler)) {
1373 inet_diag_unlock_handler(handler);
1374 nlmsg_cancel(skb, nlh);
1375 return PTR_ERR(handler);
1376 }
1377
1378 attr = handler->idiag_info_size
6ed46d12
ND		 1379 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1380 handler->idiag_info_size,
1381 INET_DIAG_PAD)
35ac838a
CG		 1382 : NULL;
1383 if (attr)
1384 info = nla_data(attr);
1385
1386 handler->idiag_get_info(sk, r, info);
1387 inet_diag_unlock_handler(handler);
1388
1389 nlmsg_end(skb, nlh);
1390 return 0;
1391}
1392
8dcf01fc 1393static const struct sock_diag_handler inet_diag_handler = {
d366477a 1394 .family = AF_INET,
6eb5d2e0 1395 .dump = inet_diag_handler_cmd,
35ac838a 1396 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1397 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1398};
1399
8dcf01fc 1400static const struct sock_diag_handler inet6_diag_handler = {
d366477a 1401 .family = AF_INET6,
6eb5d2e0 1402 .dump = inet_diag_handler_cmd,
35ac838a 1403 .get_info = inet_diag_handler_get_info,
6eb5d2e0 1404 .destroy = inet_diag_handler_cmd,
d366477a
PE		 1405};
1406
4f5736c4
ACM		 1407int inet_diag_register(const struct inet_diag_handler *h)
1408{
1409 const __u16 type = h->idiag_type;
1410 int err = -EINVAL;
1411
f13c95f0 1412 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1413 goto out;
1414
d523a328 1415 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1416 err = -EEXIST;
e31c5e0e 1417 if (!inet_diag_table[type]) {
4f5736c4
ACM		 1418 inet_diag_table[type] = h;
1419 err = 0;
1420 }
d523a328 1421 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1422out:
1423 return err;
1424}
1425EXPORT_SYMBOL_GPL(inet_diag_register);
1426
1427void inet_diag_unregister(const struct inet_diag_handler *h)
1428{
1429 const __u16 type = h->idiag_type;
1430
f13c95f0 1431 if (type >= IPPROTO_MAX)
4f5736c4
ACM		 1432 return;
1433
d523a328 1434 mutex_lock(&inet_diag_table_mutex);
4f5736c4 1435 inet_diag_table[type] = NULL;
d523a328 1436 mutex_unlock(&inet_diag_table_mutex);
4f5736c4
ACM		 1437}
1438EXPORT_SYMBOL_GPL(inet_diag_unregister);
1439
73c1f4a0 1440static int __init inet_diag_init(void)
1da177e4 1441{
f13c95f0 1442 const int inet_diag_table_size = (IPPROTO_MAX *
4f5736c4
ACM		 1443 sizeof(struct inet_diag_handler *));
1444 int err = -ENOMEM;
1445
0da974f4 1446 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
4f5736c4
ACM		 1447 if (!inet_diag_table)
1448 goto out;
1449
d366477a
PE		 1450 err = sock_diag_register(&inet_diag_handler);
1451 if (err)
1452 goto out_free_nl;
1453
1454 err = sock_diag_register(&inet6_diag_handler);
1455 if (err)
1456 goto out_free_inet;
1457
8ef874bf 1458 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4
ACM		 1459out:
1460 return err;
d366477a
PE		 1461
1462out_free_inet:
1463 sock_diag_unregister(&inet_diag_handler);
1464out_free_nl:
4f5736c4
ACM		 1465 kfree(inet_diag_table);
1466 goto out;
1da177e4
LT		 1467}
1468
73c1f4a0 1469static void __exit inet_diag_exit(void)
1da177e4 1470{
d366477a
PE		 1471 sock_diag_unregister(&inet6_diag_handler);
1472 sock_diag_unregister(&inet_diag_handler);
8ef874bf 1473 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
4f5736c4 1474 kfree(inet_diag_table);
1da177e4
LT		 1475}
1476
73c1f4a0
ACM		 1477module_init(inet_diag_init);
1478module_exit(inet_diag_exit);
1da177e4 1479MODULE_LICENSE("GPL");
aec8dc62
PE		 1480MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1481MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux 6.x block layer and io_uring tree(s)