This source file includes following definitions.
- inet_diag_lock_handler
- inet_diag_unlock_handler
- inet_diag_msg_common_fill
- inet_sk_attr_size
- inet_diag_msg_attrs_fill
- inet_sk_diag_fill
- inet_csk_diag_fill
- inet_twsk_diag_fill
- inet_req_diag_fill
- sk_diag_fill
- inet_diag_find_one_icsk
- inet_diag_dump_one_icsk
- inet_diag_cmd_exact
- bitstring_match
- inet_diag_bc_run
- entry_fill_addrs
- inet_diag_bc_sk
- valid_cc
- valid_devcond
- valid_hostcond
- valid_port_comparison
- valid_markcond
- inet_diag_bc_audit
- inet_csk_diag_dump
- twsk_build_assert
- inet_diag_dump_icsk
- __inet_diag_dump
- inet_diag_dump
- inet_diag_type2proto
- inet_diag_dump_compat
- inet_diag_get_exact_compat
- inet_diag_rcv_msg_compat
- inet_diag_handler_cmd
- inet_diag_handler_get_info
- inet_diag_register
- inet_diag_unregister
- inet_diag_init
- inet_diag_exit
1
2
3
4
5
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/netlink.h>
27
28 #include <linux/inet.h>
29 #include <linux/stddef.h>
30
31 #include <linux/inet_diag.h>
32 #include <linux/sock_diag.h>
33
34 static const struct inet_diag_handler **inet_diag_table;
35
36 struct inet_diag_entry {
37 const __be32 *saddr;
38 const __be32 *daddr;
39 u16 sport;
40 u16 dport;
41 u16 family;
42 u16 userlocks;
43 u32 ifindex;
44 u32 mark;
45 };
46
47 static DEFINE_MUTEX(inet_diag_table_mutex);
48
49 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
50 {
51 if (!inet_diag_table[proto])
52 sock_load_diag_module(AF_INET, proto);
53
54 mutex_lock(&inet_diag_table_mutex);
55 if (!inet_diag_table[proto])
56 return ERR_PTR(-ENOENT);
57
58 return inet_diag_table[proto];
59 }
60
61 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
62 {
63 mutex_unlock(&inet_diag_table_mutex);
64 }
65
66 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
67 {
68 r->idiag_family = sk->sk_family;
69
70 r->id.idiag_sport = htons(sk->sk_num);
71 r->id.idiag_dport = sk->sk_dport;
72 r->id.idiag_if = sk->sk_bound_dev_if;
73 sock_diag_save_cookie(sk, r->id.idiag_cookie);
74
75 #if IS_ENABLED(CONFIG_IPV6)
76 if (sk->sk_family == AF_INET6) {
77 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
78 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
79 } else
80 #endif
81 {
82 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
83 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
84
85 r->id.idiag_src[0] = sk->sk_rcv_saddr;
86 r->id.idiag_dst[0] = sk->sk_daddr;
87 }
88 }
89 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
90
91 static size_t inet_sk_attr_size(struct sock *sk,
92 const struct inet_diag_req_v2 *req,
93 bool net_admin)
94 {
95 const struct inet_diag_handler *handler;
96 size_t aux = 0;
97
98 handler = inet_diag_table[req->sdiag_protocol];
99 if (handler && handler->idiag_get_aux_size)
100 aux = handler->idiag_get_aux_size(sk, net_admin);
101
102 return nla_total_size(sizeof(struct tcp_info))
103 + nla_total_size(sizeof(struct inet_diag_msg))
104 + inet_diag_msg_attrs_size()
105 + nla_total_size(sizeof(struct inet_diag_meminfo))
106 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
107 + nla_total_size(TCP_CA_NAME_MAX)
108 + nla_total_size(sizeof(struct tcpvegas_info))
109 + aux
110 + 64;
111 }
112
113 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
114 struct inet_diag_msg *r, int ext,
115 struct user_namespace *user_ns,
116 bool net_admin)
117 {
118 const struct inet_sock *inet = inet_sk(sk);
119
120 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
121 goto errout;
122
123
124
125
126 if (ext & (1 << (INET_DIAG_TOS - 1)))
127 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
128 goto errout;
129
130 #if IS_ENABLED(CONFIG_IPV6)
131 if (r->idiag_family == AF_INET6) {
132 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
133 if (nla_put_u8(skb, INET_DIAG_TCLASS,
134 inet6_sk(sk)->tclass) < 0)
135 goto errout;
136
137 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
138 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
139 goto errout;
140 }
141 #endif
142
143 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
144 goto errout;
145
146 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
147 ext & (1 << (INET_DIAG_TCLASS - 1))) {
148 u32 classid = 0;
149
150 #ifdef CONFIG_SOCK_CGROUP_DATA
151 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
152 #endif
153
154
155
156
157 if (!classid)
158 classid = sk->sk_priority;
159
160 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
161 goto errout;
162 }
163
164 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
165 r->idiag_inode = sock_i_ino(sk);
166
167 return 0;
168 errout:
169 return 1;
170 }
171 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
172
173 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
174 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
175 struct user_namespace *user_ns,
176 u32 portid, u32 seq, u16 nlmsg_flags,
177 const struct nlmsghdr *unlh,
178 bool net_admin)
179 {
180 const struct tcp_congestion_ops *ca_ops;
181 const struct inet_diag_handler *handler;
182 int ext = req->idiag_ext;
183 struct inet_diag_msg *r;
184 struct nlmsghdr *nlh;
185 struct nlattr *attr;
186 void *info = NULL;
187
188 handler = inet_diag_table[req->sdiag_protocol];
189 BUG_ON(!handler);
190
191 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
192 nlmsg_flags);
193 if (!nlh)
194 return -EMSGSIZE;
195
196 r = nlmsg_data(nlh);
197 BUG_ON(!sk_fullsock(sk));
198
199 inet_diag_msg_common_fill(r, sk);
200 r->idiag_state = sk->sk_state;
201 r->idiag_timer = 0;
202 r->idiag_retrans = 0;
203
204 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
205 goto errout;
206
207 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
208 struct inet_diag_meminfo minfo = {
209 .idiag_rmem = sk_rmem_alloc_get(sk),
210 .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
211 .idiag_fmem = sk->sk_forward_alloc,
212 .idiag_tmem = sk_wmem_alloc_get(sk),
213 };
214
215 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
216 goto errout;
217 }
218
219 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
220 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
221 goto errout;
222
223
224
225
226
227 if (sk->sk_type == SOCK_RAW) {
228 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
229 goto errout;
230 }
231
232 if (!icsk) {
233 handler->idiag_get_info(sk, r, NULL);
234 goto out;
235 }
236
237 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
238 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
239 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
240 r->idiag_timer = 1;
241 r->idiag_retrans = icsk->icsk_retransmits;
242 r->idiag_expires =
243 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
244 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
245 r->idiag_timer = 4;
246 r->idiag_retrans = icsk->icsk_probes_out;
247 r->idiag_expires =
248 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
249 } else if (timer_pending(&sk->sk_timer)) {
250 r->idiag_timer = 2;
251 r->idiag_retrans = icsk->icsk_probes_out;
252 r->idiag_expires =
253 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
254 } else {
255 r->idiag_timer = 0;
256 r->idiag_expires = 0;
257 }
258
259 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
260 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
261 handler->idiag_info_size,
262 INET_DIAG_PAD);
263 if (!attr)
264 goto errout;
265
266 info = nla_data(attr);
267 }
268
269 if (ext & (1 << (INET_DIAG_CONG - 1))) {
270 int err = 0;
271
272 rcu_read_lock();
273 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
274 if (ca_ops)
275 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
276 rcu_read_unlock();
277 if (err < 0)
278 goto errout;
279 }
280
281 handler->idiag_get_info(sk, r, info);
282
283 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
284 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
285 goto errout;
286
287 if (sk->sk_state < TCP_TIME_WAIT) {
288 union tcp_cc_info info;
289 size_t sz = 0;
290 int attr;
291
292 rcu_read_lock();
293 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
294 if (ca_ops && ca_ops->get_info)
295 sz = ca_ops->get_info(sk, ext, &attr, &info);
296 rcu_read_unlock();
297 if (sz && nla_put(skb, attr, sz, &info) < 0)
298 goto errout;
299 }
300
301 out:
302 nlmsg_end(skb, nlh);
303 return 0;
304
305 errout:
306 nlmsg_cancel(skb, nlh);
307 return -EMSGSIZE;
308 }
309 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
310
311 static int inet_csk_diag_fill(struct sock *sk,
312 struct sk_buff *skb,
313 const struct inet_diag_req_v2 *req,
314 struct user_namespace *user_ns,
315 u32 portid, u32 seq, u16 nlmsg_flags,
316 const struct nlmsghdr *unlh,
317 bool net_admin)
318 {
319 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
320 portid, seq, nlmsg_flags, unlh, net_admin);
321 }
322
323 static int inet_twsk_diag_fill(struct sock *sk,
324 struct sk_buff *skb,
325 u32 portid, u32 seq, u16 nlmsg_flags,
326 const struct nlmsghdr *unlh)
327 {
328 struct inet_timewait_sock *tw = inet_twsk(sk);
329 struct inet_diag_msg *r;
330 struct nlmsghdr *nlh;
331 long tmo;
332
333 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
334 nlmsg_flags);
335 if (!nlh)
336 return -EMSGSIZE;
337
338 r = nlmsg_data(nlh);
339 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
340
341 tmo = tw->tw_timer.expires - jiffies;
342 if (tmo < 0)
343 tmo = 0;
344
345 inet_diag_msg_common_fill(r, sk);
346 r->idiag_retrans = 0;
347
348 r->idiag_state = tw->tw_substate;
349 r->idiag_timer = 3;
350 r->idiag_expires = jiffies_to_msecs(tmo);
351 r->idiag_rqueue = 0;
352 r->idiag_wqueue = 0;
353 r->idiag_uid = 0;
354 r->idiag_inode = 0;
355
356 nlmsg_end(skb, nlh);
357 return 0;
358 }
359
360 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
361 u32 portid, u32 seq, u16 nlmsg_flags,
362 const struct nlmsghdr *unlh, bool net_admin)
363 {
364 struct request_sock *reqsk = inet_reqsk(sk);
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;
378 r->idiag_retrans = reqsk->num_retrans;
379
380 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
381 offsetof(struct sock, sk_cookie));
382
383 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
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
390 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
391 inet_rsk(reqsk)->ir_mark))
392 return -EMSGSIZE;
393
394 nlmsg_end(skb, nlh);
395 return 0;
396 }
397
398 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
399 const struct inet_diag_req_v2 *r,
400 struct user_namespace *user_ns,
401 u32 portid, u32 seq, u16 nlmsg_flags,
402 const struct nlmsghdr *unlh, bool net_admin)
403 {
404 if (sk->sk_state == TCP_TIME_WAIT)
405 return inet_twsk_diag_fill(sk, skb, portid, seq,
406 nlmsg_flags, unlh);
407
408 if (sk->sk_state == TCP_NEW_SYN_RECV)
409 return inet_req_diag_fill(sk, skb, portid, seq,
410 nlmsg_flags, unlh, net_admin);
411
412 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
413 nlmsg_flags, unlh, net_admin);
414 }
415
416 struct sock *inet_diag_find_one_icsk(struct net *net,
417 struct inet_hashinfo *hashinfo,
418 const struct inet_diag_req_v2 *req)
419 {
420 struct sock *sk;
421
422 rcu_read_lock();
423 if (req->sdiag_family == AF_INET)
424 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
425 req->id.idiag_dport, req->id.idiag_src[0],
426 req->id.idiag_sport, req->id.idiag_if);
427 #if IS_ENABLED(CONFIG_IPV6)
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))
431 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
432 req->id.idiag_dport, req->id.idiag_src[3],
433 req->id.idiag_sport, req->id.idiag_if);
434 else
435 sk = inet6_lookup(net, hashinfo, NULL, 0,
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 }
442 #endif
443 else {
444 rcu_read_unlock();
445 return ERR_PTR(-EINVAL);
446 }
447 rcu_read_unlock();
448 if (!sk)
449 return ERR_PTR(-ENOENT);
450
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 }
458 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
459
460 int 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 {
465 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
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);
474
475 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
476 if (!rep) {
477 err = -ENOMEM;
478 goto out;
479 }
480
481 err = sk_diag_fill(sk, rep, req,
482 sk_user_ns(NETLINK_CB(in_skb).sk),
483 NETLINK_CB(in_skb).portid,
484 nlh->nlmsg_seq, 0, nlh, net_admin);
485 if (err < 0) {
486 WARN_ON(err == -EMSGSIZE);
487 nlmsg_free(rep);
488 goto out;
489 }
490 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
491 MSG_DONTWAIT);
492 if (err > 0)
493 err = 0;
494
495 out:
496 if (sk)
497 sock_gen_put(sk);
498
499 return err;
500 }
501 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
502
503 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
504 const struct nlmsghdr *nlh,
505 const struct inet_diag_req_v2 *req)
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);
513 else if (cmd == SOCK_DIAG_BY_FAMILY)
514 err = handler->dump_one(in_skb, nlh, req);
515 else if (cmd == SOCK_DESTROY && handler->destroy)
516 err = handler->destroy(in_skb, req);
517 else
518 err = -EOPNOTSUPP;
519 inet_diag_unlock_handler(handler);
520
521 return err;
522 }
523
524 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
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) {
535 __be32 w1, w2;
536 __be32 mask;
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
550 static int inet_diag_bc_run(const struct nlattr *_bc,
551 const struct inet_diag_entry *entry)
552 {
553 const void *bc = nla_data(_bc);
554 int len = nla_len(_bc);
555
556 while (len > 0) {
557 int yes = 1;
558 const struct inet_diag_bc_op *op = bc;
559
560 switch (op->code) {
561 case INET_DIAG_BC_NOP:
562 break;
563 case INET_DIAG_BC_JMP:
564 yes = 0;
565 break;
566 case INET_DIAG_BC_S_EQ:
567 yes = entry->sport == op[1].no;
568 break;
569 case INET_DIAG_BC_S_GE:
570 yes = entry->sport >= op[1].no;
571 break;
572 case INET_DIAG_BC_S_LE:
573 yes = entry->sport <= op[1].no;
574 break;
575 case INET_DIAG_BC_D_EQ:
576 yes = entry->dport == op[1].no;
577 break;
578 case INET_DIAG_BC_D_GE:
579 yes = entry->dport >= op[1].no;
580 break;
581 case INET_DIAG_BC_D_LE:
582 yes = entry->dport <= op[1].no;
583 break;
584 case INET_DIAG_BC_AUTO:
585 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
586 break;
587 case INET_DIAG_BC_S_COND:
588 case INET_DIAG_BC_D_COND: {
589 const struct inet_diag_hostcond *cond;
590 const __be32 *addr;
591
592 cond = (const struct inet_diag_hostcond *)(op + 1);
593 if (cond->port != -1 &&
594 cond->port != (op->code == INET_DIAG_BC_S_COND ?
595 entry->sport : entry->dport)) {
596 yes = 0;
597 break;
598 }
599
600 if (op->code == INET_DIAG_BC_S_COND)
601 addr = entry->saddr;
602 else
603 addr = entry->daddr;
604
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;
622 if (bitstring_match(addr, cond->addr,
623 cond->prefix_len))
624 break;
625 yes = 0;
626 break;
627 }
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 }
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 }
644 }
645
646 if (yes) {
647 len -= op->yes;
648 bc += op->yes;
649 } else {
650 len -= op->no;
651 bc += op->no;
652 }
653 }
654 return len == 0;
655 }
656
657
658
659 static 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
674 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
675 {
676 struct inet_sock *inet = inet_sk(sk);
677 struct inet_diag_entry entry;
678
679 if (!bc)
680 return 1;
681
682 entry.family = sk->sk_family;
683 entry_fill_addrs(&entry, sk);
684 entry.sport = inet->inet_num;
685 entry.dport = ntohs(inet->inet_dport);
686 entry.ifindex = sk->sk_bound_dev_if;
687 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
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;
694
695 return inet_diag_bc_run(bc, &entry);
696 }
697 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
698
699 static int valid_cc(const void *bc, int len, int cc)
700 {
701 while (len >= 0) {
702 const struct inet_diag_bc_op *op = bc;
703
704 if (cc > len)
705 return 0;
706 if (cc == len)
707 return 1;
708 if (op->yes < 4 || op->yes & 3)
709 return 0;
710 len -= op->yes;
711 bc += op->yes;
712 }
713 return 0;
714 }
715
716
717 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
718 int *min_len)
719 {
720
721 *min_len += sizeof(u32);
722 if (len < *min_len)
723 return false;
724
725 return true;
726 }
727
728 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
729 int *min_len)
730 {
731 struct inet_diag_hostcond *cond;
732 int addr_len;
733
734
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
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
759 if (cond->prefix_len > 8 * addr_len)
760 return false;
761
762 return true;
763 }
764
765
766 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
767 int len, int *min_len)
768 {
769
770 *min_len += sizeof(struct inet_diag_bc_op);
771 if (len < *min_len)
772 return false;
773 return true;
774 }
775
776 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
777 int *min_len)
778 {
779 *min_len += sizeof(struct inet_diag_markcond);
780 return len >= *min_len;
781 }
782
783 static 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);
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);
795
796 while (len > 0) {
797 int min_len = sizeof(struct inet_diag_bc_op);
798 const struct inet_diag_bc_op *op = bc;
799
800 switch (op->code) {
801 case INET_DIAG_BC_S_COND:
802 case INET_DIAG_BC_D_COND:
803 if (!valid_hostcond(bc, len, &min_len))
804 return -EINVAL;
805 break;
806 case INET_DIAG_BC_DEV_COND:
807 if (!valid_devcond(bc, len, &min_len))
808 return -EINVAL;
809 break;
810 case INET_DIAG_BC_S_EQ:
811 case INET_DIAG_BC_S_GE:
812 case INET_DIAG_BC_S_LE:
813 case INET_DIAG_BC_D_EQ:
814 case INET_DIAG_BC_D_GE:
815 case INET_DIAG_BC_D_LE:
816 if (!valid_port_comparison(bc, len, &min_len))
817 return -EINVAL;
818 break;
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;
825 case INET_DIAG_BC_AUTO:
826 case INET_DIAG_BC_JMP:
827 case INET_DIAG_BC_NOP:
828 break;
829 default:
830 return -EINVAL;
831 }
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
841 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
842 return -EINVAL;
843 bc += op->yes;
844 len -= op->yes;
845 }
846 return len == 0 ? 0 : -EINVAL;
847 }
848
849 static int inet_csk_diag_dump(struct sock *sk,
850 struct sk_buff *skb,
851 struct netlink_callback *cb,
852 const struct inet_diag_req_v2 *r,
853 const struct nlattr *bc,
854 bool net_admin)
855 {
856 if (!inet_diag_bc_sk(bc, sk))
857 return 0;
858
859 return inet_csk_diag_fill(sk, skb, r,
860 sk_user_ns(NETLINK_CB(cb->skb).sk),
861 NETLINK_CB(cb->skb).portid,
862 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
863 net_admin);
864 }
865
866 static 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
892 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
893 struct netlink_callback *cb,
894 const struct inet_diag_req_v2 *r, struct nlattr *bc)
895 {
896 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
897 struct net *net = sock_net(skb->sk);
898 u32 idiag_states = r->idiag_states;
899 int i, num, s_i, s_num;
900 struct sock *sk;
901
902 if (idiag_states & TCPF_SYN_RECV)
903 idiag_states |= TCPF_NEW_SYN_RECV;
904 s_i = cb->args[1];
905 s_num = num = cb->args[2];
906
907 if (cb->args[0] == 0) {
908 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
909 goto skip_listen_ht;
910
911 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
912 struct inet_listen_hashbucket *ilb;
913 struct hlist_nulls_node *node;
914
915 num = 0;
916 ilb = &hashinfo->listening_hash[i];
917 spin_lock(&ilb->lock);
918 sk_nulls_for_each(sk, node, &ilb->nulls_head) {
919 struct inet_sock *inet = inet_sk(sk);
920
921 if (!net_eq(sock_net(sk), net))
922 continue;
923
924 if (num < s_num) {
925 num++;
926 continue;
927 }
928
929 if (r->sdiag_family != AF_UNSPEC &&
930 sk->sk_family != r->sdiag_family)
931 goto next_listen;
932
933 if (r->id.idiag_sport != inet->inet_sport &&
934 r->id.idiag_sport)
935 goto next_listen;
936
937 if (inet_csk_diag_dump(sk, skb, cb, r,
938 bc, net_admin) < 0) {
939 spin_unlock(&ilb->lock);
940 goto done;
941 }
942
943 next_listen:
944 ++num;
945 }
946 spin_unlock(&ilb->lock);
947
948 s_num = 0;
949 }
950 skip_listen_ht:
951 cb->args[0] = 1;
952 s_i = num = s_num = 0;
953 }
954
955 if (!(idiag_states & ~TCPF_LISTEN))
956 goto out;
957
958 #define SKARR_SZ 16
959 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
960 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
961 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
962 struct hlist_nulls_node *node;
963 struct sock *sk_arr[SKARR_SZ];
964 int num_arr[SKARR_SZ];
965 int idx, accum, res;
966
967 if (hlist_nulls_empty(&head->chain))
968 continue;
969
970 if (i > s_i)
971 s_num = 0;
972
973 next_chunk:
974 num = 0;
975 accum = 0;
976 spin_lock_bh(lock);
977 sk_nulls_for_each(sk, node, &head->chain) {
978 int state;
979
980 if (!net_eq(sock_net(sk), net))
981 continue;
982 if (num < s_num)
983 goto next_normal;
984 state = (sk->sk_state == TCP_TIME_WAIT) ?
985 inet_twsk(sk)->tw_substate : sk->sk_state;
986 if (!(idiag_states & (1 << state)))
987 goto next_normal;
988 if (r->sdiag_family != AF_UNSPEC &&
989 sk->sk_family != r->sdiag_family)
990 goto next_normal;
991 if (r->id.idiag_sport != htons(sk->sk_num) &&
992 r->id.idiag_sport)
993 goto next_normal;
994 if (r->id.idiag_dport != sk->sk_dport &&
995 r->id.idiag_dport)
996 goto next_normal;
997 twsk_build_assert();
998
999 if (!inet_diag_bc_sk(bc, sk))
1000 goto next_normal;
1001
1002 if (!refcount_inc_not_zero(&sk->sk_refcnt))
1003 goto next_normal;
1004
1005 num_arr[accum] = num;
1006 sk_arr[accum] = sk;
1007 if (++accum == SKARR_SZ)
1008 break;
1009 next_normal:
1010 ++num;
1011 }
1012 spin_unlock_bh(lock);
1013 res = 0;
1014 for (idx = 0; idx < accum; idx++) {
1015 if (res >= 0) {
1016 res = sk_diag_fill(sk_arr[idx], skb, r,
1017 sk_user_ns(NETLINK_CB(cb->skb).sk),
1018 NETLINK_CB(cb->skb).portid,
1019 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1020 cb->nlh, net_admin);
1021 if (res < 0)
1022 num = num_arr[idx];
1023 }
1024 sock_gen_put(sk_arr[idx]);
1025 }
1026 if (res < 0)
1027 break;
1028 cond_resched();
1029 if (accum == SKARR_SZ) {
1030 s_num = num + 1;
1031 goto next_chunk;
1032 }
1033 }
1034
1035 done:
1036 cb->args[1] = i;
1037 cb->args[2] = num;
1038 out:
1039 ;
1040 }
1041 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1042
1043 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1044 const struct inet_diag_req_v2 *r,
1045 struct nlattr *bc)
1046 {
1047 const struct inet_diag_handler *handler;
1048 int err = 0;
1049
1050 handler = inet_diag_lock_handler(r->sdiag_protocol);
1051 if (!IS_ERR(handler))
1052 handler->dump(skb, cb, r, bc);
1053 else
1054 err = PTR_ERR(handler);
1055 inet_diag_unlock_handler(handler);
1056
1057 return err ? : skb->len;
1058 }
1059
1060 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1061 {
1062 int hdrlen = sizeof(struct inet_diag_req_v2);
1063 struct nlattr *bc = NULL;
1064
1065 if (nlmsg_attrlen(cb->nlh, hdrlen))
1066 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1067
1068 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1069 }
1070
1071 static int inet_diag_type2proto(int type)
1072 {
1073 switch (type) {
1074 case TCPDIAG_GETSOCK:
1075 return IPPROTO_TCP;
1076 case DCCPDIAG_GETSOCK:
1077 return IPPROTO_DCCP;
1078 default:
1079 return 0;
1080 }
1081 }
1082
1083 static int inet_diag_dump_compat(struct sk_buff *skb,
1084 struct netlink_callback *cb)
1085 {
1086 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1087 int hdrlen = sizeof(struct inet_diag_req);
1088 struct inet_diag_req_v2 req;
1089 struct nlattr *bc = NULL;
1090
1091 req.sdiag_family = AF_UNSPEC;
1092 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1093 req.idiag_ext = rc->idiag_ext;
1094 req.idiag_states = rc->idiag_states;
1095 req.id = rc->id;
1096
1097 if (nlmsg_attrlen(cb->nlh, hdrlen))
1098 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1099
1100 return __inet_diag_dump(skb, cb, &req, bc);
1101 }
1102
1103 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1104 const struct nlmsghdr *nlh)
1105 {
1106 struct inet_diag_req *rc = nlmsg_data(nlh);
1107 struct inet_diag_req_v2 req;
1108
1109 req.sdiag_family = rc->idiag_family;
1110 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1111 req.idiag_ext = rc->idiag_ext;
1112 req.idiag_states = rc->idiag_states;
1113 req.id = rc->id;
1114
1115 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1116 }
1117
1118 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1119 {
1120 int hdrlen = sizeof(struct inet_diag_req);
1121 struct net *net = sock_net(skb->sk);
1122
1123 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1124 nlmsg_len(nlh) < hdrlen)
1125 return -EINVAL;
1126
1127 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1128 if (nlmsg_attrlen(nlh, hdrlen)) {
1129 struct nlattr *attr;
1130 int err;
1131
1132 attr = nlmsg_find_attr(nlh, hdrlen,
1133 INET_DIAG_REQ_BYTECODE);
1134 err = inet_diag_bc_audit(attr, skb);
1135 if (err)
1136 return err;
1137 }
1138 {
1139 struct netlink_dump_control c = {
1140 .dump = inet_diag_dump_compat,
1141 };
1142 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1143 }
1144 }
1145
1146 return inet_diag_get_exact_compat(skb, nlh);
1147 }
1148
1149 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1150 {
1151 int hdrlen = sizeof(struct inet_diag_req_v2);
1152 struct net *net = sock_net(skb->sk);
1153
1154 if (nlmsg_len(h) < hdrlen)
1155 return -EINVAL;
1156
1157 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1158 h->nlmsg_flags & NLM_F_DUMP) {
1159 if (nlmsg_attrlen(h, hdrlen)) {
1160 struct nlattr *attr;
1161 int err;
1162
1163 attr = nlmsg_find_attr(h, hdrlen,
1164 INET_DIAG_REQ_BYTECODE);
1165 err = inet_diag_bc_audit(attr, skb);
1166 if (err)
1167 return err;
1168 }
1169 {
1170 struct netlink_dump_control c = {
1171 .dump = inet_diag_dump,
1172 };
1173 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1174 }
1175 }
1176
1177 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1178 }
1179
1180 static
1181 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1182 {
1183 const struct inet_diag_handler *handler;
1184 struct nlmsghdr *nlh;
1185 struct nlattr *attr;
1186 struct inet_diag_msg *r;
1187 void *info = NULL;
1188 int err = 0;
1189
1190 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1191 if (!nlh)
1192 return -ENOMEM;
1193
1194 r = nlmsg_data(nlh);
1195 memset(r, 0, sizeof(*r));
1196 inet_diag_msg_common_fill(r, sk);
1197 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1198 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1199 r->idiag_state = sk->sk_state;
1200
1201 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1202 nlmsg_cancel(skb, nlh);
1203 return err;
1204 }
1205
1206 handler = inet_diag_lock_handler(sk->sk_protocol);
1207 if (IS_ERR(handler)) {
1208 inet_diag_unlock_handler(handler);
1209 nlmsg_cancel(skb, nlh);
1210 return PTR_ERR(handler);
1211 }
1212
1213 attr = handler->idiag_info_size
1214 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1215 handler->idiag_info_size,
1216 INET_DIAG_PAD)
1217 : NULL;
1218 if (attr)
1219 info = nla_data(attr);
1220
1221 handler->idiag_get_info(sk, r, info);
1222 inet_diag_unlock_handler(handler);
1223
1224 nlmsg_end(skb, nlh);
1225 return 0;
1226 }
1227
1228 static const struct sock_diag_handler inet_diag_handler = {
1229 .family = AF_INET,
1230 .dump = inet_diag_handler_cmd,
1231 .get_info = inet_diag_handler_get_info,
1232 .destroy = inet_diag_handler_cmd,
1233 };
1234
1235 static const struct sock_diag_handler inet6_diag_handler = {
1236 .family = AF_INET6,
1237 .dump = inet_diag_handler_cmd,
1238 .get_info = inet_diag_handler_get_info,
1239 .destroy = inet_diag_handler_cmd,
1240 };
1241
1242 int inet_diag_register(const struct inet_diag_handler *h)
1243 {
1244 const __u16 type = h->idiag_type;
1245 int err = -EINVAL;
1246
1247 if (type >= IPPROTO_MAX)
1248 goto out;
1249
1250 mutex_lock(&inet_diag_table_mutex);
1251 err = -EEXIST;
1252 if (!inet_diag_table[type]) {
1253 inet_diag_table[type] = h;
1254 err = 0;
1255 }
1256 mutex_unlock(&inet_diag_table_mutex);
1257 out:
1258 return err;
1259 }
1260 EXPORT_SYMBOL_GPL(inet_diag_register);
1261
1262 void inet_diag_unregister(const struct inet_diag_handler *h)
1263 {
1264 const __u16 type = h->idiag_type;
1265
1266 if (type >= IPPROTO_MAX)
1267 return;
1268
1269 mutex_lock(&inet_diag_table_mutex);
1270 inet_diag_table[type] = NULL;
1271 mutex_unlock(&inet_diag_table_mutex);
1272 }
1273 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1274
1275 static int __init inet_diag_init(void)
1276 {
1277 const int inet_diag_table_size = (IPPROTO_MAX *
1278 sizeof(struct inet_diag_handler *));
1279 int err = -ENOMEM;
1280
1281 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1282 if (!inet_diag_table)
1283 goto out;
1284
1285 err = sock_diag_register(&inet_diag_handler);
1286 if (err)
1287 goto out_free_nl;
1288
1289 err = sock_diag_register(&inet6_diag_handler);
1290 if (err)
1291 goto out_free_inet;
1292
1293 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1294 out:
1295 return err;
1296
1297 out_free_inet:
1298 sock_diag_unregister(&inet_diag_handler);
1299 out_free_nl:
1300 kfree(inet_diag_table);
1301 goto out;
1302 }
1303
1304 static void __exit inet_diag_exit(void)
1305 {
1306 sock_diag_unregister(&inet6_diag_handler);
1307 sock_diag_unregister(&inet_diag_handler);
1308 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1309 kfree(inet_diag_table);
1310 }
1311
1312 module_init(inet_diag_init);
1313 module_exit(inet_diag_exit);
1314 MODULE_LICENSE("GPL");
1315 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 );
1316 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 );