?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
drm/ast: Fix ast_dp connection status
[drm/drm-misc.git] / net / ipv4 / inet_diag.c
blob321acc8abf17e8c7d6a4e3326615123fff19deab
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * inet_diag.c Module for monitoring INET transport protocols sockets.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/fcntl.h>
12 #include <linux/random.h>
13 #include <linux/slab.h>
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>
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>
26 #include <net/bpf_sk_storage.h>
27 #include <net/netlink.h>
28
29 #include <linux/inet.h>
30 #include <linux/stddef.h>
31
32 #include <linux/inet_diag.h>
33 #include <linux/sock_diag.h>
34
35 static const struct inet_diag_handler __rcu **inet_diag_table;
36
37 struct inet_diag_entry {
38 const __be32 *saddr;
39 const __be32 *daddr;
40 u16 sport;
41 u16 dport;
42 u16 family;
43 u16 userlocks;
44 u32 ifindex;
45 u32 mark;
46 #ifdef CONFIG_SOCK_CGROUP_DATA
47 u64 cgroup_id;
48 #endif
49 };
50
51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
52 {
53 const struct inet_diag_handler *handler;
54
55 if (proto < 0 || proto >= IPPROTO_MAX)
56 return NULL;
57
58 if (!READ_ONCE(inet_diag_table[proto]))
59 sock_load_diag_module(AF_INET, proto);
60
61 rcu_read_lock();
62 handler = rcu_dereference(inet_diag_table[proto]);
63 if (handler && !try_module_get(handler->owner))
64 handler = NULL;
65 rcu_read_unlock();
66
67 return handler;
68 }
69
70 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
71 {
72 module_put(handler->owner);
73 }
74
75 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
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 }
98 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
99
100 static size_t inet_sk_attr_size(struct sock *sk,
101 const struct inet_diag_req_v2 *req,
102 bool net_admin)
103 {
104 const struct inet_diag_handler *handler;
105 size_t aux = 0;
106
107 rcu_read_lock();
108 handler = rcu_dereference(inet_diag_table[req->sdiag_protocol]);
109 DEBUG_NET_WARN_ON_ONCE(!handler);
110 if (handler && handler->idiag_get_aux_size)
111 aux = handler->idiag_get_aux_size(sk, net_admin);
112 rcu_read_unlock();
113
114 return nla_total_size(sizeof(struct tcp_info))
115 + nla_total_size(sizeof(struct inet_diag_msg))
116 + inet_diag_msg_attrs_size()
117 + nla_total_size(sizeof(struct inet_diag_meminfo))
118 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
119 + nla_total_size(TCP_CA_NAME_MAX)
120 + nla_total_size(sizeof(struct tcpvegas_info))
121 + aux
122 + 64;
123 }
124
125 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
126 struct inet_diag_msg *r, int ext,
127 struct user_namespace *user_ns,
128 bool net_admin)
129 {
130 const struct inet_sock *inet = inet_sk(sk);
131 struct inet_diag_sockopt inet_sockopt;
132
133 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
134 goto errout;
135
136 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
137 * hence this needs to be included regardless of socket family.
138 */
139 if (ext & (1 << (INET_DIAG_TOS - 1)))
140 if (nla_put_u8(skb, INET_DIAG_TOS, READ_ONCE(inet->tos)) < 0)
141 goto errout;
142
143 #if IS_ENABLED(CONFIG_IPV6)
144 if (r->idiag_family == AF_INET6) {
145 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
146 if (nla_put_u8(skb, INET_DIAG_TCLASS,
147 inet6_sk(sk)->tclass) < 0)
148 goto errout;
149
150 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
151 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
152 goto errout;
153 }
154 #endif
155
156 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, READ_ONCE(sk->sk_mark)))
157 goto errout;
158
159 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
160 ext & (1 << (INET_DIAG_TCLASS - 1))) {
161 u32 classid = 0;
162
163 #ifdef CONFIG_SOCK_CGROUP_DATA
164 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
165 #endif
166 /* Fallback to socket priority if class id isn't set.
167 * Classful qdiscs use it as direct reference to class.
168 * For cgroup2 classid is always zero.
169 */
170 if (!classid)
171 classid = READ_ONCE(sk->sk_priority);
172
173 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
174 goto errout;
175 }
176
177 #ifdef CONFIG_SOCK_CGROUP_DATA
178 if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
179 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
180 INET_DIAG_PAD))
181 goto errout;
182 #endif
183
184 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
185 r->idiag_inode = sock_i_ino(sk);
186
187 memset(&inet_sockopt, 0, sizeof(inet_sockopt));
188 inet_sockopt.recverr = inet_test_bit(RECVERR, sk);
189 inet_sockopt.is_icsk = inet_test_bit(IS_ICSK, sk);
190 inet_sockopt.freebind = inet_test_bit(FREEBIND, sk);
191 inet_sockopt.hdrincl = inet_test_bit(HDRINCL, sk);
192 inet_sockopt.mc_loop = inet_test_bit(MC_LOOP, sk);
193 inet_sockopt.transparent = inet_test_bit(TRANSPARENT, sk);
194 inet_sockopt.mc_all = inet_test_bit(MC_ALL, sk);
195 inet_sockopt.nodefrag = inet_test_bit(NODEFRAG, sk);
196 inet_sockopt.bind_address_no_port = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
197 inet_sockopt.recverr_rfc4884 = inet_test_bit(RECVERR_RFC4884, sk);
198 inet_sockopt.defer_connect = inet_test_bit(DEFER_CONNECT, sk);
199 if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
200 &inet_sockopt))
201 goto errout;
202
203 return 0;
204 errout:
205 return 1;
206 }
207 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
208
209 static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
210 struct nlattr **req_nlas)
211 {
212 struct nlattr *nla;
213 int remaining;
214
215 nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
216 int type = nla_type(nla);
217
218 if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
219 return -EINVAL;
220
221 if (type < __INET_DIAG_REQ_MAX)
222 req_nlas[type] = nla;
223 }
224 return 0;
225 }
226
227 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
228 const struct inet_diag_dump_data *data)
229 {
230 if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
231 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
232 return req->sdiag_protocol;
233 }
234
235 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
236
237 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
238 struct sk_buff *skb, struct netlink_callback *cb,
239 const struct inet_diag_req_v2 *req,
240 u16 nlmsg_flags, bool net_admin)
241 {
242 const struct tcp_congestion_ops *ca_ops;
243 const struct inet_diag_handler *handler;
244 struct inet_diag_dump_data *cb_data;
245 int ext = req->idiag_ext;
246 struct inet_diag_msg *r;
247 struct nlmsghdr *nlh;
248 struct nlattr *attr;
249 void *info = NULL;
250 u8 icsk_pending;
251 int protocol;
252
253 cb_data = cb->data;
254 protocol = inet_diag_get_protocol(req, cb_data);
255
256 /* inet_diag_lock_handler() made sure inet_diag_table[] is stable. */
257 handler = rcu_dereference_protected(inet_diag_table[protocol], 1);
258 DEBUG_NET_WARN_ON_ONCE(!handler);
259 if (!handler)
260 return -ENXIO;
261
262 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
263 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
264 if (!nlh)
265 return -EMSGSIZE;
266
267 r = nlmsg_data(nlh);
268 BUG_ON(!sk_fullsock(sk));
269
270 inet_diag_msg_common_fill(r, sk);
271 r->idiag_state = sk->sk_state;
272 r->idiag_timer = 0;
273 r->idiag_retrans = 0;
274 r->idiag_expires = 0;
275
276 if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
277 sk_user_ns(NETLINK_CB(cb->skb).sk),
278 net_admin))
279 goto errout;
280
281 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
282 struct inet_diag_meminfo minfo = {
283 .idiag_rmem = sk_rmem_alloc_get(sk),
284 .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
285 .idiag_fmem = sk_forward_alloc_get(sk),
286 .idiag_tmem = sk_wmem_alloc_get(sk),
287 };
288
289 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
290 goto errout;
291 }
292
293 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
294 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
295 goto errout;
296
297 /*
298 * RAW sockets might have user-defined protocols assigned,
299 * so report the one supplied on socket creation.
300 */
301 if (sk->sk_type == SOCK_RAW) {
302 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
303 goto errout;
304 }
305
306 if (!icsk) {
307 handler->idiag_get_info(sk, r, NULL);
308 goto out;
309 }
310
311 icsk_pending = smp_load_acquire(&icsk->icsk_pending);
312 if (icsk_pending == ICSK_TIME_RETRANS ||
313 icsk_pending == ICSK_TIME_REO_TIMEOUT ||
314 icsk_pending == ICSK_TIME_LOSS_PROBE) {
315 r->idiag_timer = 1;
316 r->idiag_retrans = icsk->icsk_retransmits;
317 r->idiag_expires =
318 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
319 } else if (icsk_pending == ICSK_TIME_PROBE0) {
320 r->idiag_timer = 4;
321 r->idiag_retrans = icsk->icsk_probes_out;
322 r->idiag_expires =
323 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
324 } else if (timer_pending(&sk->sk_timer)) {
325 r->idiag_timer = 2;
326 r->idiag_retrans = icsk->icsk_probes_out;
327 r->idiag_expires =
328 jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
329 }
330
331 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
332 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
333 handler->idiag_info_size,
334 INET_DIAG_PAD);
335 if (!attr)
336 goto errout;
337
338 info = nla_data(attr);
339 }
340
341 if (ext & (1 << (INET_DIAG_CONG - 1))) {
342 int err = 0;
343
344 rcu_read_lock();
345 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
346 if (ca_ops)
347 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
348 rcu_read_unlock();
349 if (err < 0)
350 goto errout;
351 }
352
353 handler->idiag_get_info(sk, r, info);
354
355 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
356 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
357 goto errout;
358
359 if (sk->sk_state < TCP_TIME_WAIT) {
360 union tcp_cc_info info;
361 size_t sz = 0;
362 int attr;
363
364 rcu_read_lock();
365 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
366 if (ca_ops && ca_ops->get_info)
367 sz = ca_ops->get_info(sk, ext, &attr, &info);
368 rcu_read_unlock();
369 if (sz && nla_put(skb, attr, sz, &info) < 0)
370 goto errout;
371 }
372
373 /* Keep it at the end for potential retry with a larger skb,
374 * or else do best-effort fitting, which is only done for the
375 * first_nlmsg.
376 */
377 if (cb_data->bpf_stg_diag) {
378 bool first_nlmsg = ((unsigned char *)nlh == skb->data);
379 unsigned int prev_min_dump_alloc;
380 unsigned int total_nla_size = 0;
381 unsigned int msg_len;
382 int err;
383
384 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
385 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
386 INET_DIAG_SK_BPF_STORAGES,
387 &total_nla_size);
388
389 if (!err)
390 goto out;
391
392 total_nla_size += msg_len;
393 prev_min_dump_alloc = cb->min_dump_alloc;
394 if (total_nla_size > prev_min_dump_alloc)
395 cb->min_dump_alloc = min_t(u32, total_nla_size,
396 MAX_DUMP_ALLOC_SIZE);
397
398 if (!first_nlmsg)
399 goto errout;
400
401 if (cb->min_dump_alloc > prev_min_dump_alloc)
402 /* Retry with pskb_expand_head() with
403 * __GFP_DIRECT_RECLAIM
404 */
405 goto errout;
406
407 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
408
409 /* Send what we have for this sk
410 * and move on to the next sk in the following
411 * dump()
412 */
413 }
414
415 out:
416 nlmsg_end(skb, nlh);
417 return 0;
418
419 errout:
420 nlmsg_cancel(skb, nlh);
421 return -EMSGSIZE;
422 }
423 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
424
425 static int inet_twsk_diag_fill(struct sock *sk,
426 struct sk_buff *skb,
427 struct netlink_callback *cb,
428 u16 nlmsg_flags, bool net_admin)
429 {
430 struct inet_timewait_sock *tw = inet_twsk(sk);
431 struct inet_diag_msg *r;
432 struct nlmsghdr *nlh;
433 long tmo;
434
435 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
436 cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
437 sizeof(*r), nlmsg_flags);
438 if (!nlh)
439 return -EMSGSIZE;
440
441 r = nlmsg_data(nlh);
442 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
443
444 inet_diag_msg_common_fill(r, sk);
445 r->idiag_retrans = 0;
446
447 r->idiag_state = READ_ONCE(tw->tw_substate);
448 r->idiag_timer = 3;
449 tmo = tw->tw_timer.expires - jiffies;
450 r->idiag_expires = jiffies_delta_to_msecs(tmo);
451 r->idiag_rqueue = 0;
452 r->idiag_wqueue = 0;
453 r->idiag_uid = 0;
454 r->idiag_inode = 0;
455
456 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
457 tw->tw_mark)) {
458 nlmsg_cancel(skb, nlh);
459 return -EMSGSIZE;
460 }
461
462 nlmsg_end(skb, nlh);
463 return 0;
464 }
465
466 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
467 struct netlink_callback *cb,
468 u16 nlmsg_flags, bool net_admin)
469 {
470 struct request_sock *reqsk = inet_reqsk(sk);
471 struct inet_diag_msg *r;
472 struct nlmsghdr *nlh;
473 long tmo;
474
475 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
476 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
477 if (!nlh)
478 return -EMSGSIZE;
479
480 r = nlmsg_data(nlh);
481 inet_diag_msg_common_fill(r, sk);
482 r->idiag_state = TCP_SYN_RECV;
483 r->idiag_timer = 1;
484 r->idiag_retrans = reqsk->num_retrans;
485
486 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
487 offsetof(struct sock, sk_cookie));
488
489 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
490 r->idiag_expires = jiffies_delta_to_msecs(tmo);
491 r->idiag_rqueue = 0;
492 r->idiag_wqueue = 0;
493 r->idiag_uid = 0;
494 r->idiag_inode = 0;
495
496 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
497 inet_rsk(reqsk)->ir_mark)) {
498 nlmsg_cancel(skb, nlh);
499 return -EMSGSIZE;
500 }
501
502 nlmsg_end(skb, nlh);
503 return 0;
504 }
505
506 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
507 struct netlink_callback *cb,
508 const struct inet_diag_req_v2 *r,
509 u16 nlmsg_flags, bool net_admin)
510 {
511 if (sk->sk_state == TCP_TIME_WAIT)
512 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
513
514 if (sk->sk_state == TCP_NEW_SYN_RECV)
515 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
516
517 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
518 net_admin);
519 }
520
521 struct sock *inet_diag_find_one_icsk(struct net *net,
522 struct inet_hashinfo *hashinfo,
523 const struct inet_diag_req_v2 *req)
524 {
525 struct sock *sk;
526
527 rcu_read_lock();
528 if (req->sdiag_family == AF_INET)
529 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
530 req->id.idiag_dport, req->id.idiag_src[0],
531 req->id.idiag_sport, req->id.idiag_if);
532 #if IS_ENABLED(CONFIG_IPV6)
533 else if (req->sdiag_family == AF_INET6) {
534 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
535 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
536 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
537 req->id.idiag_dport, req->id.idiag_src[3],
538 req->id.idiag_sport, req->id.idiag_if);
539 else
540 sk = inet6_lookup(net, hashinfo, NULL, 0,
541 (struct in6_addr *)req->id.idiag_dst,
542 req->id.idiag_dport,
543 (struct in6_addr *)req->id.idiag_src,
544 req->id.idiag_sport,
545 req->id.idiag_if);
546 }
547 #endif
548 else {
549 rcu_read_unlock();
550 return ERR_PTR(-EINVAL);
551 }
552 rcu_read_unlock();
553 if (!sk)
554 return ERR_PTR(-ENOENT);
555
556 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
557 sock_gen_put(sk);
558 return ERR_PTR(-ENOENT);
559 }
560
561 return sk;
562 }
563 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
564
565 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
566 struct netlink_callback *cb,
567 const struct inet_diag_req_v2 *req)
568 {
569 struct sk_buff *in_skb = cb->skb;
570 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
571 struct net *net = sock_net(in_skb->sk);
572 struct sk_buff *rep;
573 struct sock *sk;
574 int err;
575
576 sk = inet_diag_find_one_icsk(net, hashinfo, req);
577 if (IS_ERR(sk))
578 return PTR_ERR(sk);
579
580 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
581 if (!rep) {
582 err = -ENOMEM;
583 goto out;
584 }
585
586 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
587 if (err < 0) {
588 WARN_ON(err == -EMSGSIZE);
589 nlmsg_free(rep);
590 goto out;
591 }
592 err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
593
594 out:
595 if (sk)
596 sock_gen_put(sk);
597
598 return err;
599 }
600 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
601
602 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
603 const struct nlmsghdr *nlh,
604 int hdrlen,
605 const struct inet_diag_req_v2 *req)
606 {
607 const struct inet_diag_handler *handler;
608 struct inet_diag_dump_data dump_data;
609 int err, protocol;
610
611 memset(&dump_data, 0, sizeof(dump_data));
612 err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
613 if (err)
614 return err;
615
616 protocol = inet_diag_get_protocol(req, &dump_data);
617
618 handler = inet_diag_lock_handler(protocol);
619 if (!handler)
620 return -ENOENT;
621
622 if (cmd == SOCK_DIAG_BY_FAMILY) {
623 struct netlink_callback cb = {
624 .nlh = nlh,
625 .skb = in_skb,
626 .data = &dump_data,
627 };
628 err = handler->dump_one(&cb, req);
629 } else if (cmd == SOCK_DESTROY && handler->destroy) {
630 err = handler->destroy(in_skb, req);
631 } else {
632 err = -EOPNOTSUPP;
633 }
634 inet_diag_unlock_handler(handler);
635
636 return err;
637 }
638
639 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
640 {
641 int words = bits >> 5;
642
643 bits &= 0x1f;
644
645 if (words) {
646 if (memcmp(a1, a2, words << 2))
647 return 0;
648 }
649 if (bits) {
650 __be32 w1, w2;
651 __be32 mask;
652
653 w1 = a1[words];
654 w2 = a2[words];
655
656 mask = htonl((0xffffffff) << (32 - bits));
657
658 if ((w1 ^ w2) & mask)
659 return 0;
660 }
661
662 return 1;
663 }
664
665 static int inet_diag_bc_run(const struct nlattr *_bc,
666 const struct inet_diag_entry *entry)
667 {
668 const void *bc = nla_data(_bc);
669 int len = nla_len(_bc);
670
671 while (len > 0) {
672 int yes = 1;
673 const struct inet_diag_bc_op *op = bc;
674
675 switch (op->code) {
676 case INET_DIAG_BC_NOP:
677 break;
678 case INET_DIAG_BC_JMP:
679 yes = 0;
680 break;
681 case INET_DIAG_BC_S_EQ:
682 yes = entry->sport == op[1].no;
683 break;
684 case INET_DIAG_BC_S_GE:
685 yes = entry->sport >= op[1].no;
686 break;
687 case INET_DIAG_BC_S_LE:
688 yes = entry->sport <= op[1].no;
689 break;
690 case INET_DIAG_BC_D_EQ:
691 yes = entry->dport == op[1].no;
692 break;
693 case INET_DIAG_BC_D_GE:
694 yes = entry->dport >= op[1].no;
695 break;
696 case INET_DIAG_BC_D_LE:
697 yes = entry->dport <= op[1].no;
698 break;
699 case INET_DIAG_BC_AUTO:
700 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
701 break;
702 case INET_DIAG_BC_S_COND:
703 case INET_DIAG_BC_D_COND: {
704 const struct inet_diag_hostcond *cond;
705 const __be32 *addr;
706
707 cond = (const struct inet_diag_hostcond *)(op + 1);
708 if (cond->port != -1 &&
709 cond->port != (op->code == INET_DIAG_BC_S_COND ?
710 entry->sport : entry->dport)) {
711 yes = 0;
712 break;
713 }
714
715 if (op->code == INET_DIAG_BC_S_COND)
716 addr = entry->saddr;
717 else
718 addr = entry->daddr;
719
720 if (cond->family != AF_UNSPEC &&
721 cond->family != entry->family) {
722 if (entry->family == AF_INET6 &&
723 cond->family == AF_INET) {
724 if (addr[0] == 0 && addr[1] == 0 &&
725 addr[2] == htonl(0xffff) &&
726 bitstring_match(addr + 3,
727 cond->addr,
728 cond->prefix_len))
729 break;
730 }
731 yes = 0;
732 break;
733 }
734
735 if (cond->prefix_len == 0)
736 break;
737 if (bitstring_match(addr, cond->addr,
738 cond->prefix_len))
739 break;
740 yes = 0;
741 break;
742 }
743 case INET_DIAG_BC_DEV_COND: {
744 u32 ifindex;
745
746 ifindex = *((const u32 *)(op + 1));
747 if (ifindex != entry->ifindex)
748 yes = 0;
749 break;
750 }
751 case INET_DIAG_BC_MARK_COND: {
752 struct inet_diag_markcond *cond;
753
754 cond = (struct inet_diag_markcond *)(op + 1);
755 if ((entry->mark & cond->mask) != cond->mark)
756 yes = 0;
757 break;
758 }
759 #ifdef CONFIG_SOCK_CGROUP_DATA
760 case INET_DIAG_BC_CGROUP_COND: {
761 u64 cgroup_id;
762
763 cgroup_id = get_unaligned((const u64 *)(op + 1));
764 if (cgroup_id != entry->cgroup_id)
765 yes = 0;
766 break;
767 }
768 #endif
769 }
770
771 if (yes) {
772 len -= op->yes;
773 bc += op->yes;
774 } else {
775 len -= op->no;
776 bc += op->no;
777 }
778 }
779 return len == 0;
780 }
781
782 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
783 */
784 static void entry_fill_addrs(struct inet_diag_entry *entry,
785 const struct sock *sk)
786 {
787 #if IS_ENABLED(CONFIG_IPV6)
788 if (sk->sk_family == AF_INET6) {
789 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
790 entry->daddr = sk->sk_v6_daddr.s6_addr32;
791 } else
792 #endif
793 {
794 entry->saddr = &sk->sk_rcv_saddr;
795 entry->daddr = &sk->sk_daddr;
796 }
797 }
798
799 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
800 {
801 struct inet_sock *inet = inet_sk(sk);
802 struct inet_diag_entry entry;
803
804 if (!bc)
805 return 1;
806
807 entry.family = sk->sk_family;
808 entry_fill_addrs(&entry, sk);
809 entry.sport = inet->inet_num;
810 entry.dport = ntohs(inet->inet_dport);
811 entry.ifindex = sk->sk_bound_dev_if;
812 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
813 if (sk_fullsock(sk))
814 entry.mark = READ_ONCE(sk->sk_mark);
815 else if (sk->sk_state == TCP_NEW_SYN_RECV)
816 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
817 else if (sk->sk_state == TCP_TIME_WAIT)
818 entry.mark = inet_twsk(sk)->tw_mark;
819 else
820 entry.mark = 0;
821 #ifdef CONFIG_SOCK_CGROUP_DATA
822 entry.cgroup_id = sk_fullsock(sk) ?
823 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
824 #endif
825
826 return inet_diag_bc_run(bc, &entry);
827 }
828 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
829
830 static int valid_cc(const void *bc, int len, int cc)
831 {
832 while (len >= 0) {
833 const struct inet_diag_bc_op *op = bc;
834
835 if (cc > len)
836 return 0;
837 if (cc == len)
838 return 1;
839 if (op->yes < 4 || op->yes & 3)
840 return 0;
841 len -= op->yes;
842 bc += op->yes;
843 }
844 return 0;
845 }
846
847 /* data is u32 ifindex */
848 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
849 int *min_len)
850 {
851 /* Check ifindex space. */
852 *min_len += sizeof(u32);
853 if (len < *min_len)
854 return false;
855
856 return true;
857 }
858 /* Validate an inet_diag_hostcond. */
859 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
860 int *min_len)
861 {
862 struct inet_diag_hostcond *cond;
863 int addr_len;
864
865 /* Check hostcond space. */
866 *min_len += sizeof(struct inet_diag_hostcond);
867 if (len < *min_len)
868 return false;
869 cond = (struct inet_diag_hostcond *)(op + 1);
870
871 /* Check address family and address length. */
872 switch (cond->family) {
873 case AF_UNSPEC:
874 addr_len = 0;
875 break;
876 case AF_INET:
877 addr_len = sizeof(struct in_addr);
878 break;
879 case AF_INET6:
880 addr_len = sizeof(struct in6_addr);
881 break;
882 default:
883 return false;
884 }
885 *min_len += addr_len;
886 if (len < *min_len)
887 return false;
888
889 /* Check prefix length (in bits) vs address length (in bytes). */
890 if (cond->prefix_len > 8 * addr_len)
891 return false;
892
893 return true;
894 }
895
896 /* Validate a port comparison operator. */
897 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
898 int len, int *min_len)
899 {
900 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
901 *min_len += sizeof(struct inet_diag_bc_op);
902 if (len < *min_len)
903 return false;
904 return true;
905 }
906
907 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
908 int *min_len)
909 {
910 *min_len += sizeof(struct inet_diag_markcond);
911 return len >= *min_len;
912 }
913
914 #ifdef CONFIG_SOCK_CGROUP_DATA
915 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
916 int *min_len)
917 {
918 *min_len += sizeof(u64);
919 return len >= *min_len;
920 }
921 #endif
922
923 static int inet_diag_bc_audit(const struct nlattr *attr,
924 const struct sk_buff *skb)
925 {
926 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
927 const void *bytecode, *bc;
928 int bytecode_len, len;
929
930 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
931 return -EINVAL;
932
933 bytecode = bc = nla_data(attr);
934 len = bytecode_len = nla_len(attr);
935
936 while (len > 0) {
937 int min_len = sizeof(struct inet_diag_bc_op);
938 const struct inet_diag_bc_op *op = bc;
939
940 switch (op->code) {
941 case INET_DIAG_BC_S_COND:
942 case INET_DIAG_BC_D_COND:
943 if (!valid_hostcond(bc, len, &min_len))
944 return -EINVAL;
945 break;
946 case INET_DIAG_BC_DEV_COND:
947 if (!valid_devcond(bc, len, &min_len))
948 return -EINVAL;
949 break;
950 case INET_DIAG_BC_S_EQ:
951 case INET_DIAG_BC_S_GE:
952 case INET_DIAG_BC_S_LE:
953 case INET_DIAG_BC_D_EQ:
954 case INET_DIAG_BC_D_GE:
955 case INET_DIAG_BC_D_LE:
956 if (!valid_port_comparison(bc, len, &min_len))
957 return -EINVAL;
958 break;
959 case INET_DIAG_BC_MARK_COND:
960 if (!net_admin)
961 return -EPERM;
962 if (!valid_markcond(bc, len, &min_len))
963 return -EINVAL;
964 break;
965 #ifdef CONFIG_SOCK_CGROUP_DATA
966 case INET_DIAG_BC_CGROUP_COND:
967 if (!valid_cgroupcond(bc, len, &min_len))
968 return -EINVAL;
969 break;
970 #endif
971 case INET_DIAG_BC_AUTO:
972 case INET_DIAG_BC_JMP:
973 case INET_DIAG_BC_NOP:
974 break;
975 default:
976 return -EINVAL;
977 }
978
979 if (op->code != INET_DIAG_BC_NOP) {
980 if (op->no < min_len || op->no > len + 4 || op->no & 3)
981 return -EINVAL;
982 if (op->no < len &&
983 !valid_cc(bytecode, bytecode_len, len - op->no))
984 return -EINVAL;
985 }
986
987 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
988 return -EINVAL;
989 bc += op->yes;
990 len -= op->yes;
991 }
992 return len == 0 ? 0 : -EINVAL;
993 }
994
995 static void twsk_build_assert(void)
996 {
997 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
998 offsetof(struct sock, sk_family));
999
1000 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
1001 offsetof(struct inet_sock, inet_num));
1002
1003 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
1004 offsetof(struct inet_sock, inet_dport));
1005
1006 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
1007 offsetof(struct inet_sock, inet_rcv_saddr));
1008
1009 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
1010 offsetof(struct inet_sock, inet_daddr));
1011
1012 #if IS_ENABLED(CONFIG_IPV6)
1013 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
1014 offsetof(struct sock, sk_v6_rcv_saddr));
1015
1016 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1017 offsetof(struct sock, sk_v6_daddr));
1018 #endif
1019 }
1020
1021 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1022 struct netlink_callback *cb,
1023 const struct inet_diag_req_v2 *r)
1024 {
1025 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1026 struct inet_diag_dump_data *cb_data = cb->data;
1027 struct net *net = sock_net(skb->sk);
1028 u32 idiag_states = r->idiag_states;
1029 int i, num, s_i, s_num;
1030 struct nlattr *bc;
1031 struct sock *sk;
1032
1033 bc = cb_data->inet_diag_nla_bc;
1034 if (idiag_states & TCPF_SYN_RECV)
1035 idiag_states |= TCPF_NEW_SYN_RECV;
1036 s_i = cb->args[1];
1037 s_num = num = cb->args[2];
1038
1039 if (cb->args[0] == 0) {
1040 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1041 goto skip_listen_ht;
1042
1043 for (i = s_i; i <= hashinfo->lhash2_mask; i++) {
1044 struct inet_listen_hashbucket *ilb;
1045 struct hlist_nulls_node *node;
1046
1047 num = 0;
1048 ilb = &hashinfo->lhash2[i];
1049
1050 if (hlist_nulls_empty(&ilb->nulls_head)) {
1051 s_num = 0;
1052 continue;
1053 }
1054 spin_lock(&ilb->lock);
1055 sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1056 struct inet_sock *inet = inet_sk(sk);
1057
1058 if (!net_eq(sock_net(sk), net))
1059 continue;
1060
1061 if (num < s_num) {
1062 num++;
1063 continue;
1064 }
1065
1066 if (r->sdiag_family != AF_UNSPEC &&
1067 sk->sk_family != r->sdiag_family)
1068 goto next_listen;
1069
1070 if (r->id.idiag_sport != inet->inet_sport &&
1071 r->id.idiag_sport)
1072 goto next_listen;
1073
1074 if (!inet_diag_bc_sk(bc, sk))
1075 goto next_listen;
1076
1077 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1078 cb, r, NLM_F_MULTI,
1079 net_admin) < 0) {
1080 spin_unlock(&ilb->lock);
1081 goto done;
1082 }
1083
1084 next_listen:
1085 ++num;
1086 }
1087 spin_unlock(&ilb->lock);
1088
1089 s_num = 0;
1090 }
1091 skip_listen_ht:
1092 cb->args[0] = 1;
1093 s_i = num = s_num = 0;
1094 }
1095
1096 /* Process a maximum of SKARR_SZ sockets at a time when walking hash buckets
1097 * with bh disabled.
1098 */
1099 #define SKARR_SZ 16
1100
1101 /* Dump bound but inactive (not listening, connecting, etc.) sockets */
1102 if (cb->args[0] == 1) {
1103 if (!(idiag_states & TCPF_BOUND_INACTIVE))
1104 goto skip_bind_ht;
1105
1106 for (i = s_i; i < hashinfo->bhash_size; i++) {
1107 struct inet_bind_hashbucket *ibb;
1108 struct inet_bind2_bucket *tb2;
1109 struct sock *sk_arr[SKARR_SZ];
1110 int num_arr[SKARR_SZ];
1111 int idx, accum, res;
1112
1113 resume_bind_walk:
1114 num = 0;
1115 accum = 0;
1116 ibb = &hashinfo->bhash2[i];
1117
1118 if (hlist_empty(&ibb->chain)) {
1119 s_num = 0;
1120 continue;
1121 }
1122 spin_lock_bh(&ibb->lock);
1123 inet_bind_bucket_for_each(tb2, &ibb->chain) {
1124 if (!net_eq(ib2_net(tb2), net))
1125 continue;
1126
1127 sk_for_each_bound(sk, &tb2->owners) {
1128 struct inet_sock *inet = inet_sk(sk);
1129
1130 if (num < s_num)
1131 goto next_bind;
1132
1133 if (sk->sk_state != TCP_CLOSE ||
1134 !inet->inet_num)
1135 goto next_bind;
1136
1137 if (r->sdiag_family != AF_UNSPEC &&
1138 r->sdiag_family != sk->sk_family)
1139 goto next_bind;
1140
1141 if (!inet_diag_bc_sk(bc, sk))
1142 goto next_bind;
1143
1144 sock_hold(sk);
1145 num_arr[accum] = num;
1146 sk_arr[accum] = sk;
1147 if (++accum == SKARR_SZ)
1148 goto pause_bind_walk;
1149 next_bind:
1150 num++;
1151 }
1152 }
1153 pause_bind_walk:
1154 spin_unlock_bh(&ibb->lock);
1155
1156 res = 0;
1157 for (idx = 0; idx < accum; idx++) {
1158 if (res >= 0) {
1159 res = inet_sk_diag_fill(sk_arr[idx],
1160 NULL, skb, cb,
1161 r, NLM_F_MULTI,
1162 net_admin);
1163 if (res < 0)
1164 num = num_arr[idx];
1165 }
1166 sock_put(sk_arr[idx]);
1167 }
1168 if (res < 0)
1169 goto done;
1170
1171 cond_resched();
1172
1173 if (accum == SKARR_SZ) {
1174 s_num = num + 1;
1175 goto resume_bind_walk;
1176 }
1177
1178 s_num = 0;
1179 }
1180 skip_bind_ht:
1181 cb->args[0] = 2;
1182 s_i = num = s_num = 0;
1183 }
1184
1185 if (!(idiag_states & ~TCPF_LISTEN))
1186 goto out;
1187
1188 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1189 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1190 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1191 struct hlist_nulls_node *node;
1192 struct sock *sk_arr[SKARR_SZ];
1193 int num_arr[SKARR_SZ];
1194 int idx, accum, res;
1195
1196 if (hlist_nulls_empty(&head->chain))
1197 continue;
1198
1199 if (i > s_i)
1200 s_num = 0;
1201
1202 next_chunk:
1203 num = 0;
1204 accum = 0;
1205 spin_lock_bh(lock);
1206 sk_nulls_for_each(sk, node, &head->chain) {
1207 int state;
1208
1209 if (!net_eq(sock_net(sk), net))
1210 continue;
1211 if (num < s_num)
1212 goto next_normal;
1213 state = (sk->sk_state == TCP_TIME_WAIT) ?
1214 READ_ONCE(inet_twsk(sk)->tw_substate) : sk->sk_state;
1215 if (!(idiag_states & (1 << state)))
1216 goto next_normal;
1217 if (r->sdiag_family != AF_UNSPEC &&
1218 sk->sk_family != r->sdiag_family)
1219 goto next_normal;
1220 if (r->id.idiag_sport != htons(sk->sk_num) &&
1221 r->id.idiag_sport)
1222 goto next_normal;
1223 if (r->id.idiag_dport != sk->sk_dport &&
1224 r->id.idiag_dport)
1225 goto next_normal;
1226 twsk_build_assert();
1227
1228 if (!inet_diag_bc_sk(bc, sk))
1229 goto next_normal;
1230
1231 if (!refcount_inc_not_zero(&sk->sk_refcnt))
1232 goto next_normal;
1233
1234 num_arr[accum] = num;
1235 sk_arr[accum] = sk;
1236 if (++accum == SKARR_SZ)
1237 break;
1238 next_normal:
1239 ++num;
1240 }
1241 spin_unlock_bh(lock);
1242 res = 0;
1243 for (idx = 0; idx < accum; idx++) {
1244 if (res >= 0) {
1245 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1246 NLM_F_MULTI, net_admin);
1247 if (res < 0)
1248 num = num_arr[idx];
1249 }
1250 sock_gen_put(sk_arr[idx]);
1251 }
1252 if (res < 0)
1253 break;
1254 cond_resched();
1255 if (accum == SKARR_SZ) {
1256 s_num = num + 1;
1257 goto next_chunk;
1258 }
1259 }
1260
1261 done:
1262 cb->args[1] = i;
1263 cb->args[2] = num;
1264 out:
1265 ;
1266 }
1267 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1268
1269 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1270 const struct inet_diag_req_v2 *r)
1271 {
1272 struct inet_diag_dump_data *cb_data = cb->data;
1273 const struct inet_diag_handler *handler;
1274 u32 prev_min_dump_alloc;
1275 int protocol, err = 0;
1276
1277 protocol = inet_diag_get_protocol(r, cb_data);
1278
1279 again:
1280 prev_min_dump_alloc = cb->min_dump_alloc;
1281 handler = inet_diag_lock_handler(protocol);
1282 if (handler) {
1283 handler->dump(skb, cb, r);
1284 inet_diag_unlock_handler(handler);
1285 } else {
1286 err = -ENOENT;
1287 }
1288 /* The skb is not large enough to fit one sk info and
1289 * inet_sk_diag_fill() has requested for a larger skb.
1290 */
1291 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1292 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1293 if (!err)
1294 goto again;
1295 }
1296
1297 return err ? : skb->len;
1298 }
1299
1300 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1301 {
1302 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1303 }
1304
1305 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1306 {
1307 const struct nlmsghdr *nlh = cb->nlh;
1308 struct inet_diag_dump_data *cb_data;
1309 struct sk_buff *skb = cb->skb;
1310 struct nlattr *nla;
1311 int err;
1312
1313 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1314 if (!cb_data)
1315 return -ENOMEM;
1316
1317 err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1318 if (err) {
1319 kfree(cb_data);
1320 return err;
1321 }
1322 nla = cb_data->inet_diag_nla_bc;
1323 if (nla) {
1324 err = inet_diag_bc_audit(nla, skb);
1325 if (err) {
1326 kfree(cb_data);
1327 return err;
1328 }
1329 }
1330
1331 nla = cb_data->inet_diag_nla_bpf_stgs;
1332 if (nla) {
1333 struct bpf_sk_storage_diag *bpf_stg_diag;
1334
1335 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1336 if (IS_ERR(bpf_stg_diag)) {
1337 kfree(cb_data);
1338 return PTR_ERR(bpf_stg_diag);
1339 }
1340 cb_data->bpf_stg_diag = bpf_stg_diag;
1341 }
1342
1343 cb->data = cb_data;
1344 return 0;
1345 }
1346
1347 static int inet_diag_dump_start(struct netlink_callback *cb)
1348 {
1349 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1350 }
1351
1352 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1353 {
1354 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1355 }
1356
1357 static int inet_diag_dump_done(struct netlink_callback *cb)
1358 {
1359 struct inet_diag_dump_data *cb_data = cb->data;
1360
1361 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1362 kfree(cb->data);
1363
1364 return 0;
1365 }
1366
1367 static int inet_diag_type2proto(int type)
1368 {
1369 switch (type) {
1370 case TCPDIAG_GETSOCK:
1371 return IPPROTO_TCP;
1372 case DCCPDIAG_GETSOCK:
1373 return IPPROTO_DCCP;
1374 default:
1375 return 0;
1376 }
1377 }
1378
1379 static int inet_diag_dump_compat(struct sk_buff *skb,
1380 struct netlink_callback *cb)
1381 {
1382 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1383 struct inet_diag_req_v2 req;
1384
1385 req.sdiag_family = AF_UNSPEC; /* compatibility */
1386 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1387 req.idiag_ext = rc->idiag_ext;
1388 req.pad = 0;
1389 req.idiag_states = rc->idiag_states;
1390 req.id = rc->id;
1391
1392 return __inet_diag_dump(skb, cb, &req);
1393 }
1394
1395 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1396 const struct nlmsghdr *nlh)
1397 {
1398 struct inet_diag_req *rc = nlmsg_data(nlh);
1399 struct inet_diag_req_v2 req;
1400
1401 req.sdiag_family = rc->idiag_family;
1402 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1403 req.idiag_ext = rc->idiag_ext;
1404 req.pad = 0;
1405 req.idiag_states = rc->idiag_states;
1406 req.id = rc->id;
1407
1408 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1409 sizeof(struct inet_diag_req), &req);
1410 }
1411
1412 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1413 {
1414 int hdrlen = sizeof(struct inet_diag_req);
1415 struct net *net = sock_net(skb->sk);
1416
1417 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1418 nlmsg_len(nlh) < hdrlen)
1419 return -EINVAL;
1420
1421 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1422 struct netlink_dump_control c = {
1423 .start = inet_diag_dump_start_compat,
1424 .done = inet_diag_dump_done,
1425 .dump = inet_diag_dump_compat,
1426 };
1427 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1428 }
1429
1430 return inet_diag_get_exact_compat(skb, nlh);
1431 }
1432
1433 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1434 {
1435 int hdrlen = sizeof(struct inet_diag_req_v2);
1436 struct net *net = sock_net(skb->sk);
1437
1438 if (nlmsg_len(h) < hdrlen)
1439 return -EINVAL;
1440
1441 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1442 h->nlmsg_flags & NLM_F_DUMP) {
1443 struct netlink_dump_control c = {
1444 .start = inet_diag_dump_start,
1445 .done = inet_diag_dump_done,
1446 .dump = inet_diag_dump,
1447 };
1448 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1449 }
1450
1451 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1452 nlmsg_data(h));
1453 }
1454
1455 static
1456 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1457 {
1458 const struct inet_diag_handler *handler;
1459 struct nlmsghdr *nlh;
1460 struct nlattr *attr;
1461 struct inet_diag_msg *r;
1462 void *info = NULL;
1463 int err = 0;
1464
1465 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1466 if (!nlh)
1467 return -ENOMEM;
1468
1469 r = nlmsg_data(nlh);
1470 memset(r, 0, sizeof(*r));
1471 inet_diag_msg_common_fill(r, sk);
1472 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1473 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1474 r->idiag_state = sk->sk_state;
1475
1476 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1477 nlmsg_cancel(skb, nlh);
1478 return err;
1479 }
1480
1481 handler = inet_diag_lock_handler(sk->sk_protocol);
1482 if (!handler) {
1483 nlmsg_cancel(skb, nlh);
1484 return -ENOENT;
1485 }
1486
1487 attr = handler->idiag_info_size
1488 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1489 handler->idiag_info_size,
1490 INET_DIAG_PAD)
1491 : NULL;
1492 if (attr)
1493 info = nla_data(attr);
1494
1495 handler->idiag_get_info(sk, r, info);
1496 inet_diag_unlock_handler(handler);
1497
1498 nlmsg_end(skb, nlh);
1499 return 0;
1500 }
1501
1502 static const struct sock_diag_handler inet_diag_handler = {
1503 .owner = THIS_MODULE,
1504 .family = AF_INET,
1505 .dump = inet_diag_handler_cmd,
1506 .get_info = inet_diag_handler_get_info,
1507 .destroy = inet_diag_handler_cmd,
1508 };
1509
1510 static const struct sock_diag_handler inet6_diag_handler = {
1511 .owner = THIS_MODULE,
1512 .family = AF_INET6,
1513 .dump = inet_diag_handler_cmd,
1514 .get_info = inet_diag_handler_get_info,
1515 .destroy = inet_diag_handler_cmd,
1516 };
1517
1518 int inet_diag_register(const struct inet_diag_handler *h)
1519 {
1520 const __u16 type = h->idiag_type;
1521
1522 if (type >= IPPROTO_MAX)
1523 return -EINVAL;
1524
1525 return !cmpxchg((const struct inet_diag_handler **)&inet_diag_table[type],
1526 NULL, h) ? 0 : -EEXIST;
1527 }
1528 EXPORT_SYMBOL_GPL(inet_diag_register);
1529
1530 void inet_diag_unregister(const struct inet_diag_handler *h)
1531 {
1532 const __u16 type = h->idiag_type;
1533
1534 if (type >= IPPROTO_MAX)
1535 return;
1536
1537 xchg((const struct inet_diag_handler **)&inet_diag_table[type],
1538 NULL);
1539 }
1540 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1541
1542 static const struct sock_diag_inet_compat inet_diag_compat = {
1543 .owner = THIS_MODULE,
1544 .fn = inet_diag_rcv_msg_compat,
1545 };
1546
1547 static int __init inet_diag_init(void)
1548 {
1549 const int inet_diag_table_size = (IPPROTO_MAX *
1550 sizeof(struct inet_diag_handler *));
1551 int err = -ENOMEM;
1552
1553 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1554 if (!inet_diag_table)
1555 goto out;
1556
1557 err = sock_diag_register(&inet_diag_handler);
1558 if (err)
1559 goto out_free_nl;
1560
1561 err = sock_diag_register(&inet6_diag_handler);
1562 if (err)
1563 goto out_free_inet;
1564
1565 sock_diag_register_inet_compat(&inet_diag_compat);
1566 out:
1567 return err;
1568
1569 out_free_inet:
1570 sock_diag_unregister(&inet_diag_handler);
1571 out_free_nl:
1572 kfree(inet_diag_table);
1573 goto out;
1574 }
1575
1576 static void __exit inet_diag_exit(void)
1577 {
1578 sock_diag_unregister(&inet6_diag_handler);
1579 sock_diag_unregister(&inet_diag_handler);
1580 sock_diag_unregister_inet_compat(&inet_diag_compat);
1581 kfree(inet_diag_table);
1582 }
1583
1584 module_init(inet_diag_init);
1585 module_exit(inet_diag_exit);
1586 MODULE_LICENSE("GPL");
1587 MODULE_DESCRIPTION("INET/INET6: socket monitoring via SOCK_DIAG");
1588 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1589 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Kernel DRM miscellaneous fixes and cross-tree changes