1 /*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/inet_diag.h>
36
37 static const struct inet_diag_handler **inet_diag_table;
38
39 struct inet_diag_entry {
40 __be32 *saddr;
41 __be32 *daddr;
42 u16 sport;
43 u16 dport;
44 u16 family;
45 u16 userlocks;
46 };
47
48 static struct sock *idiagnl;
49
50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
52
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
inet_diag_lock_handler(int type)55 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
56 {
57 if (!inet_diag_table[type])
58 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
59 NETLINK_INET_DIAG, type);
60
61 mutex_lock(&inet_diag_table_mutex);
62 if (!inet_diag_table[type])
63 return ERR_PTR(-ENOENT);
64
65 return inet_diag_table[type];
66 }
67
inet_diag_unlock_handler(const struct inet_diag_handler * handler)68 static inline void inet_diag_unlock_handler(
69 const struct inet_diag_handler *handler)
70 {
71 mutex_unlock(&inet_diag_table_mutex);
72 }
73
inet_csk_diag_fill(struct sock * sk,struct sk_buff * skb,int ext,u32 pid,u32 seq,u16 nlmsg_flags,const struct nlmsghdr * unlh)74 static int inet_csk_diag_fill(struct sock *sk,
75 struct sk_buff *skb,
76 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
77 const struct nlmsghdr *unlh)
78 {
79 const struct inet_sock *inet = inet_sk(sk);
80 const struct inet_connection_sock *icsk = inet_csk(sk);
81 struct inet_diag_msg *r;
82 struct nlmsghdr *nlh;
83 void *info = NULL;
84 struct inet_diag_meminfo *minfo = NULL;
85 unsigned char *b = skb_tail_pointer(skb);
86 const struct inet_diag_handler *handler;
87
88 handler = inet_diag_table[unlh->nlmsg_type];
89 BUG_ON(handler == NULL);
90
91 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
92 nlh->nlmsg_flags = nlmsg_flags;
93
94 r = NLMSG_DATA(nlh);
95 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
96
97 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
98 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
99
100 if (ext & (1 << (INET_DIAG_INFO - 1)))
101 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
102 handler->idiag_info_size);
103
104 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
105 const size_t len = strlen(icsk->icsk_ca_ops->name);
106
107 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
108 icsk->icsk_ca_ops->name);
109 }
110
111 r->idiag_family = sk->sk_family;
112 r->idiag_state = sk->sk_state;
113 r->idiag_timer = 0;
114 r->idiag_retrans = 0;
115
116 r->id.idiag_if = sk->sk_bound_dev_if;
117 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
118 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
119
120 r->id.idiag_sport = inet->inet_sport;
121 r->id.idiag_dport = inet->inet_dport;
122 r->id.idiag_src[0] = inet->inet_rcv_saddr;
123 r->id.idiag_dst[0] = inet->inet_daddr;
124
125 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
126 if (r->idiag_family == AF_INET6) {
127 struct ipv6_pinfo *np = inet6_sk(sk);
128
129 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
130 &np->rcv_saddr);
131 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
132 &np->daddr);
133 }
134 #endif
135
136 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
137
138 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
139 r->idiag_timer = 1;
140 r->idiag_retrans = icsk->icsk_retransmits;
141 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
142 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
143 r->idiag_timer = 4;
144 r->idiag_retrans = icsk->icsk_probes_out;
145 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
146 } else if (timer_pending(&sk->sk_timer)) {
147 r->idiag_timer = 2;
148 r->idiag_retrans = icsk->icsk_probes_out;
149 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
150 } else {
151 r->idiag_timer = 0;
152 r->idiag_expires = 0;
153 }
154 #undef EXPIRES_IN_MS
155
156 r->idiag_uid = sock_i_uid(sk);
157 r->idiag_inode = sock_i_ino(sk);
158
159 if (minfo) {
160 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
161 minfo->idiag_wmem = sk->sk_wmem_queued;
162 minfo->idiag_fmem = sk->sk_forward_alloc;
163 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
164 }
165
166 handler->idiag_get_info(sk, r, info);
167
168 if (sk->sk_state < TCP_TIME_WAIT &&
169 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
170 icsk->icsk_ca_ops->get_info(sk, ext, skb);
171
172 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
173 return skb->len;
174
175 rtattr_failure:
176 nlmsg_failure:
177 nlmsg_trim(skb, b);
178 return -EMSGSIZE;
179 }
180
inet_twsk_diag_fill(struct inet_timewait_sock * tw,struct sk_buff * skb,int ext,u32 pid,u32 seq,u16 nlmsg_flags,const struct nlmsghdr * unlh)181 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
182 struct sk_buff *skb, int ext, u32 pid,
183 u32 seq, u16 nlmsg_flags,
184 const struct nlmsghdr *unlh)
185 {
186 long tmo;
187 struct inet_diag_msg *r;
188 const unsigned char *previous_tail = skb_tail_pointer(skb);
189 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
190 unlh->nlmsg_type, sizeof(*r));
191
192 r = NLMSG_DATA(nlh);
193 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
194
195 nlh->nlmsg_flags = nlmsg_flags;
196
197 tmo = tw->tw_ttd - jiffies;
198 if (tmo < 0)
199 tmo = 0;
200
201 r->idiag_family = tw->tw_family;
202 r->idiag_retrans = 0;
203 r->id.idiag_if = tw->tw_bound_dev_if;
204 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
205 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
206 r->id.idiag_sport = tw->tw_sport;
207 r->id.idiag_dport = tw->tw_dport;
208 r->id.idiag_src[0] = tw->tw_rcv_saddr;
209 r->id.idiag_dst[0] = tw->tw_daddr;
210 r->idiag_state = tw->tw_substate;
211 r->idiag_timer = 3;
212 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
213 r->idiag_rqueue = 0;
214 r->idiag_wqueue = 0;
215 r->idiag_uid = 0;
216 r->idiag_inode = 0;
217 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
218 if (tw->tw_family == AF_INET6) {
219 const struct inet6_timewait_sock *tw6 =
220 inet6_twsk((struct sock *)tw);
221
222 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
223 &tw6->tw_v6_rcv_saddr);
224 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
225 &tw6->tw_v6_daddr);
226 }
227 #endif
228 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
229 return skb->len;
230 nlmsg_failure:
231 nlmsg_trim(skb, previous_tail);
232 return -EMSGSIZE;
233 }
234
sk_diag_fill(struct sock * sk,struct sk_buff * skb,int ext,u32 pid,u32 seq,u16 nlmsg_flags,const struct nlmsghdr * unlh)235 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
236 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
237 const struct nlmsghdr *unlh)
238 {
239 if (sk->sk_state == TCP_TIME_WAIT)
240 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
241 skb, ext, pid, seq, nlmsg_flags,
242 unlh);
243 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
244 }
245
inet_diag_get_exact(struct sk_buff * in_skb,const struct nlmsghdr * nlh)246 static int inet_diag_get_exact(struct sk_buff *in_skb,
247 const struct nlmsghdr *nlh)
248 {
249 int err;
250 struct sock *sk;
251 struct inet_diag_req *req = NLMSG_DATA(nlh);
252 struct sk_buff *rep;
253 struct inet_hashinfo *hashinfo;
254 const struct inet_diag_handler *handler;
255
256 handler = inet_diag_lock_handler(nlh->nlmsg_type);
257 if (IS_ERR(handler)) {
258 err = PTR_ERR(handler);
259 goto unlock;
260 }
261
262 hashinfo = handler->idiag_hashinfo;
263 err = -EINVAL;
264
265 if (req->idiag_family == AF_INET) {
266 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
267 req->id.idiag_dport, req->id.idiag_src[0],
268 req->id.idiag_sport, req->id.idiag_if);
269 }
270 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
271 else if (req->idiag_family == AF_INET6) {
272 sk = inet6_lookup(&init_net, hashinfo,
273 (struct in6_addr *)req->id.idiag_dst,
274 req->id.idiag_dport,
275 (struct in6_addr *)req->id.idiag_src,
276 req->id.idiag_sport,
277 req->id.idiag_if);
278 }
279 #endif
280 else {
281 goto unlock;
282 }
283
284 err = -ENOENT;
285 if (sk == NULL)
286 goto unlock;
287
288 err = -ESTALE;
289 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
290 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
291 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
292 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
293 goto out;
294
295 err = -ENOMEM;
296 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
297 sizeof(struct inet_diag_meminfo) +
298 handler->idiag_info_size + 64)),
299 GFP_KERNEL);
300 if (!rep)
301 goto out;
302
303 err = sk_diag_fill(sk, rep, req->idiag_ext,
304 NETLINK_CB(in_skb).pid,
305 nlh->nlmsg_seq, 0, nlh);
306 if (err < 0) {
307 WARN_ON(err == -EMSGSIZE);
308 kfree_skb(rep);
309 goto out;
310 }
311 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
312 MSG_DONTWAIT);
313 if (err > 0)
314 err = 0;
315
316 out:
317 if (sk) {
318 if (sk->sk_state == TCP_TIME_WAIT)
319 inet_twsk_put((struct inet_timewait_sock *)sk);
320 else
321 sock_put(sk);
322 }
323 unlock:
324 inet_diag_unlock_handler(handler);
325 return err;
326 }
327
bitstring_match(const __be32 * a1,const __be32 * a2,int bits)328 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
329 {
330 int words = bits >> 5;
331
332 bits &= 0x1f;
333
334 if (words) {
335 if (memcmp(a1, a2, words << 2))
336 return 0;
337 }
338 if (bits) {
339 __be32 w1, w2;
340 __be32 mask;
341
342 w1 = a1[words];
343 w2 = a2[words];
344
345 mask = htonl((0xffffffff) << (32 - bits));
346
347 if ((w1 ^ w2) & mask)
348 return 0;
349 }
350
351 return 1;
352 }
353
354
inet_diag_bc_run(const void * bc,int len,const struct inet_diag_entry * entry)355 static int inet_diag_bc_run(const void *bc, int len,
356 const struct inet_diag_entry *entry)
357 {
358 while (len > 0) {
359 int yes = 1;
360 const struct inet_diag_bc_op *op = bc;
361
362 switch (op->code) {
363 case INET_DIAG_BC_NOP:
364 break;
365 case INET_DIAG_BC_JMP:
366 yes = 0;
367 break;
368 case INET_DIAG_BC_S_GE:
369 yes = entry->sport >= op[1].no;
370 break;
371 case INET_DIAG_BC_S_LE:
372 yes = entry->sport <= op[1].no;
373 break;
374 case INET_DIAG_BC_D_GE:
375 yes = entry->dport >= op[1].no;
376 break;
377 case INET_DIAG_BC_D_LE:
378 yes = entry->dport <= op[1].no;
379 break;
380 case INET_DIAG_BC_AUTO:
381 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
382 break;
383 case INET_DIAG_BC_S_COND:
384 case INET_DIAG_BC_D_COND: {
385 struct inet_diag_hostcond *cond;
386 __be32 *addr;
387
388 cond = (struct inet_diag_hostcond *)(op + 1);
389 if (cond->port != -1 &&
390 cond->port != (op->code == INET_DIAG_BC_S_COND ?
391 entry->sport : entry->dport)) {
392 yes = 0;
393 break;
394 }
395
396 if (cond->prefix_len == 0)
397 break;
398
399 if (op->code == INET_DIAG_BC_S_COND)
400 addr = entry->saddr;
401 else
402 addr = entry->daddr;
403
404 if (bitstring_match(addr, cond->addr,
405 cond->prefix_len))
406 break;
407 if (entry->family == AF_INET6 &&
408 cond->family == AF_INET) {
409 if (addr[0] == 0 && addr[1] == 0 &&
410 addr[2] == htonl(0xffff) &&
411 bitstring_match(addr + 3, cond->addr,
412 cond->prefix_len))
413 break;
414 }
415 yes = 0;
416 break;
417 }
418 }
419
420 if (yes) {
421 len -= op->yes;
422 bc += op->yes;
423 } else {
424 len -= op->no;
425 bc += op->no;
426 }
427 }
428 return len == 0;
429 }
430
valid_cc(const void * bc,int len,int cc)431 static int valid_cc(const void *bc, int len, int cc)
432 {
433 while (len >= 0) {
434 const struct inet_diag_bc_op *op = bc;
435
436 if (cc > len)
437 return 0;
438 if (cc == len)
439 return 1;
440 if (op->yes < 4)
441 return 0;
442 len -= op->yes;
443 bc += op->yes;
444 }
445 return 0;
446 }
447
inet_diag_bc_audit(const void * bytecode,int bytecode_len)448 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
449 {
450 const unsigned char *bc = bytecode;
451 int len = bytecode_len;
452
453 while (len > 0) {
454 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
455
456 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
457 switch (op->code) {
458 case INET_DIAG_BC_AUTO:
459 case INET_DIAG_BC_S_COND:
460 case INET_DIAG_BC_D_COND:
461 case INET_DIAG_BC_S_GE:
462 case INET_DIAG_BC_S_LE:
463 case INET_DIAG_BC_D_GE:
464 case INET_DIAG_BC_D_LE:
465 if (op->yes < 4 || op->yes > len + 4)
466 return -EINVAL;
467 case INET_DIAG_BC_JMP:
468 if (op->no < 4 || op->no > len + 4)
469 return -EINVAL;
470 if (op->no < len &&
471 !valid_cc(bytecode, bytecode_len, len - op->no))
472 return -EINVAL;
473 break;
474 case INET_DIAG_BC_NOP:
475 if (op->yes < 4 || op->yes > len + 4)
476 return -EINVAL;
477 break;
478 default:
479 return -EINVAL;
480 }
481 bc += op->yes;
482 len -= op->yes;
483 }
484 return len == 0 ? 0 : -EINVAL;
485 }
486
inet_csk_diag_dump(struct sock * sk,struct sk_buff * skb,struct netlink_callback * cb)487 static int inet_csk_diag_dump(struct sock *sk,
488 struct sk_buff *skb,
489 struct netlink_callback *cb)
490 {
491 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
492
493 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
494 struct inet_diag_entry entry;
495 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
496 sizeof(*r),
497 INET_DIAG_REQ_BYTECODE);
498 struct inet_sock *inet = inet_sk(sk);
499
500 entry.family = sk->sk_family;
501 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
502 if (entry.family == AF_INET6) {
503 struct ipv6_pinfo *np = inet6_sk(sk);
504
505 entry.saddr = np->rcv_saddr.s6_addr32;
506 entry.daddr = np->daddr.s6_addr32;
507 } else
508 #endif
509 {
510 entry.saddr = &inet->inet_rcv_saddr;
511 entry.daddr = &inet->inet_daddr;
512 }
513 entry.sport = inet->inet_num;
514 entry.dport = ntohs(inet->inet_dport);
515 entry.userlocks = sk->sk_userlocks;
516
517 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
518 return 0;
519 }
520
521 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
522 NETLINK_CB(cb->skb).pid,
523 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
524 }
525
inet_twsk_diag_dump(struct inet_timewait_sock * tw,struct sk_buff * skb,struct netlink_callback * cb)526 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
527 struct sk_buff *skb,
528 struct netlink_callback *cb)
529 {
530 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
531
532 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
533 struct inet_diag_entry entry;
534 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
535 sizeof(*r),
536 INET_DIAG_REQ_BYTECODE);
537
538 entry.family = tw->tw_family;
539 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
540 if (tw->tw_family == AF_INET6) {
541 struct inet6_timewait_sock *tw6 =
542 inet6_twsk((struct sock *)tw);
543 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
544 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
545 } else
546 #endif
547 {
548 entry.saddr = &tw->tw_rcv_saddr;
549 entry.daddr = &tw->tw_daddr;
550 }
551 entry.sport = tw->tw_num;
552 entry.dport = ntohs(tw->tw_dport);
553 entry.userlocks = 0;
554
555 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
556 return 0;
557 }
558
559 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
560 NETLINK_CB(cb->skb).pid,
561 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
562 }
563
inet_diag_fill_req(struct sk_buff * skb,struct sock * sk,struct request_sock * req,u32 pid,u32 seq,const struct nlmsghdr * unlh)564 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
565 struct request_sock *req, u32 pid, u32 seq,
566 const struct nlmsghdr *unlh)
567 {
568 const struct inet_request_sock *ireq = inet_rsk(req);
569 struct inet_sock *inet = inet_sk(sk);
570 unsigned char *b = skb_tail_pointer(skb);
571 struct inet_diag_msg *r;
572 struct nlmsghdr *nlh;
573 long tmo;
574
575 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
576 nlh->nlmsg_flags = NLM_F_MULTI;
577 r = NLMSG_DATA(nlh);
578
579 r->idiag_family = sk->sk_family;
580 r->idiag_state = TCP_SYN_RECV;
581 r->idiag_timer = 1;
582 r->idiag_retrans = req->retrans;
583
584 r->id.idiag_if = sk->sk_bound_dev_if;
585 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
586 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
587
588 tmo = req->expires - jiffies;
589 if (tmo < 0)
590 tmo = 0;
591
592 r->id.idiag_sport = inet->inet_sport;
593 r->id.idiag_dport = ireq->rmt_port;
594 r->id.idiag_src[0] = ireq->loc_addr;
595 r->id.idiag_dst[0] = ireq->rmt_addr;
596 r->idiag_expires = jiffies_to_msecs(tmo);
597 r->idiag_rqueue = 0;
598 r->idiag_wqueue = 0;
599 r->idiag_uid = sock_i_uid(sk);
600 r->idiag_inode = 0;
601 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
602 if (r->idiag_family == AF_INET6) {
603 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
604 &inet6_rsk(req)->loc_addr);
605 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
606 &inet6_rsk(req)->rmt_addr);
607 }
608 #endif
609 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
610
611 return skb->len;
612
613 nlmsg_failure:
614 nlmsg_trim(skb, b);
615 return -1;
616 }
617
inet_diag_dump_reqs(struct sk_buff * skb,struct sock * sk,struct netlink_callback * cb)618 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
619 struct netlink_callback *cb)
620 {
621 struct inet_diag_entry entry;
622 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
623 struct inet_connection_sock *icsk = inet_csk(sk);
624 struct listen_sock *lopt;
625 const struct nlattr *bc = NULL;
626 struct inet_sock *inet = inet_sk(sk);
627 int j, s_j;
628 int reqnum, s_reqnum;
629 int err = 0;
630
631 s_j = cb->args[3];
632 s_reqnum = cb->args[4];
633
634 if (s_j > 0)
635 s_j--;
636
637 entry.family = sk->sk_family;
638
639 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
640
641 lopt = icsk->icsk_accept_queue.listen_opt;
642 if (!lopt || !lopt->qlen)
643 goto out;
644
645 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
646 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
647 INET_DIAG_REQ_BYTECODE);
648 entry.sport = inet->inet_num;
649 entry.userlocks = sk->sk_userlocks;
650 }
651
652 for (j = s_j; j < lopt->nr_table_entries; j++) {
653 struct request_sock *req, *head = lopt->syn_table[j];
654
655 reqnum = 0;
656 for (req = head; req; reqnum++, req = req->dl_next) {
657 struct inet_request_sock *ireq = inet_rsk(req);
658
659 if (reqnum < s_reqnum)
660 continue;
661 if (r->id.idiag_dport != ireq->rmt_port &&
662 r->id.idiag_dport)
663 continue;
664
665 if (bc) {
666 entry.saddr =
667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
668 (entry.family == AF_INET6) ?
669 inet6_rsk(req)->loc_addr.s6_addr32 :
670 #endif
671 &ireq->loc_addr;
672 entry.daddr =
673 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
674 (entry.family == AF_INET6) ?
675 inet6_rsk(req)->rmt_addr.s6_addr32 :
676 #endif
677 &ireq->rmt_addr;
678 entry.dport = ntohs(ireq->rmt_port);
679
680 if (!inet_diag_bc_run(nla_data(bc),
681 nla_len(bc), &entry))
682 continue;
683 }
684
685 err = inet_diag_fill_req(skb, sk, req,
686 NETLINK_CB(cb->skb).pid,
687 cb->nlh->nlmsg_seq, cb->nlh);
688 if (err < 0) {
689 cb->args[3] = j + 1;
690 cb->args[4] = reqnum;
691 goto out;
692 }
693 }
694
695 s_reqnum = 0;
696 }
697
698 out:
699 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
700
701 return err;
702 }
703
inet_diag_dump(struct sk_buff * skb,struct netlink_callback * cb)704 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
705 {
706 int i, num;
707 int s_i, s_num;
708 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
709 const struct inet_diag_handler *handler;
710 struct inet_hashinfo *hashinfo;
711
712 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
713 if (IS_ERR(handler))
714 goto unlock;
715
716 hashinfo = handler->idiag_hashinfo;
717
718 s_i = cb->args[1];
719 s_num = num = cb->args[2];
720
721 if (cb->args[0] == 0) {
722 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
723 goto skip_listen_ht;
724
725 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
726 struct sock *sk;
727 struct hlist_nulls_node *node;
728 struct inet_listen_hashbucket *ilb;
729
730 num = 0;
731 ilb = &hashinfo->listening_hash[i];
732 spin_lock_bh(&ilb->lock);
733 sk_nulls_for_each(sk, node, &ilb->head) {
734 struct inet_sock *inet = inet_sk(sk);
735
736 if (num < s_num) {
737 num++;
738 continue;
739 }
740
741 if (r->id.idiag_sport != inet->inet_sport &&
742 r->id.idiag_sport)
743 goto next_listen;
744
745 if (!(r->idiag_states & TCPF_LISTEN) ||
746 r->id.idiag_dport ||
747 cb->args[3] > 0)
748 goto syn_recv;
749
750 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
751 spin_unlock_bh(&ilb->lock);
752 goto done;
753 }
754
755 syn_recv:
756 if (!(r->idiag_states & TCPF_SYN_RECV))
757 goto next_listen;
758
759 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
760 spin_unlock_bh(&ilb->lock);
761 goto done;
762 }
763
764 next_listen:
765 cb->args[3] = 0;
766 cb->args[4] = 0;
767 ++num;
768 }
769 spin_unlock_bh(&ilb->lock);
770
771 s_num = 0;
772 cb->args[3] = 0;
773 cb->args[4] = 0;
774 }
775 skip_listen_ht:
776 cb->args[0] = 1;
777 s_i = num = s_num = 0;
778 }
779
780 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
781 goto unlock;
782
783 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
784 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
785 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
786 struct sock *sk;
787 struct hlist_nulls_node *node;
788
789 num = 0;
790
791 if (hlist_nulls_empty(&head->chain) &&
792 hlist_nulls_empty(&head->twchain))
793 continue;
794
795 if (i > s_i)
796 s_num = 0;
797
798 spin_lock_bh(lock);
799 sk_nulls_for_each(sk, node, &head->chain) {
800 struct inet_sock *inet = inet_sk(sk);
801
802 if (num < s_num)
803 goto next_normal;
804 if (!(r->idiag_states & (1 << sk->sk_state)))
805 goto next_normal;
806 if (r->id.idiag_sport != inet->inet_sport &&
807 r->id.idiag_sport)
808 goto next_normal;
809 if (r->id.idiag_dport != inet->inet_dport &&
810 r->id.idiag_dport)
811 goto next_normal;
812 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
813 spin_unlock_bh(lock);
814 goto done;
815 }
816 next_normal:
817 ++num;
818 }
819
820 if (r->idiag_states & TCPF_TIME_WAIT) {
821 struct inet_timewait_sock *tw;
822
823 inet_twsk_for_each(tw, node,
824 &head->twchain) {
825
826 if (num < s_num)
827 goto next_dying;
828 if (r->id.idiag_sport != tw->tw_sport &&
829 r->id.idiag_sport)
830 goto next_dying;
831 if (r->id.idiag_dport != tw->tw_dport &&
832 r->id.idiag_dport)
833 goto next_dying;
834 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
835 spin_unlock_bh(lock);
836 goto done;
837 }
838 next_dying:
839 ++num;
840 }
841 }
842 spin_unlock_bh(lock);
843 }
844
845 done:
846 cb->args[1] = i;
847 cb->args[2] = num;
848 unlock:
849 inet_diag_unlock_handler(handler);
850 return skb->len;
851 }
852
inet_diag_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh)853 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
854 {
855 int hdrlen = sizeof(struct inet_diag_req);
856
857 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
858 nlmsg_len(nlh) < hdrlen)
859 return -EINVAL;
860
861 if (nlh->nlmsg_flags & NLM_F_DUMP) {
862 if (nlmsg_attrlen(nlh, hdrlen)) {
863 struct nlattr *attr;
864
865 attr = nlmsg_find_attr(nlh, hdrlen,
866 INET_DIAG_REQ_BYTECODE);
867 if (attr == NULL ||
868 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
869 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
870 return -EINVAL;
871 }
872
873 return netlink_dump_start(idiagnl, skb, nlh,
874 inet_diag_dump, NULL);
875 }
876
877 return inet_diag_get_exact(skb, nlh);
878 }
879
880 static DEFINE_MUTEX(inet_diag_mutex);
881
inet_diag_rcv(struct sk_buff * skb)882 static void inet_diag_rcv(struct sk_buff *skb)
883 {
884 mutex_lock(&inet_diag_mutex);
885 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
886 mutex_unlock(&inet_diag_mutex);
887 }
888
inet_diag_register(const struct inet_diag_handler * h)889 int inet_diag_register(const struct inet_diag_handler *h)
890 {
891 const __u16 type = h->idiag_type;
892 int err = -EINVAL;
893
894 if (type >= INET_DIAG_GETSOCK_MAX)
895 goto out;
896
897 mutex_lock(&inet_diag_table_mutex);
898 err = -EEXIST;
899 if (inet_diag_table[type] == NULL) {
900 inet_diag_table[type] = h;
901 err = 0;
902 }
903 mutex_unlock(&inet_diag_table_mutex);
904 out:
905 return err;
906 }
907 EXPORT_SYMBOL_GPL(inet_diag_register);
908
inet_diag_unregister(const struct inet_diag_handler * h)909 void inet_diag_unregister(const struct inet_diag_handler *h)
910 {
911 const __u16 type = h->idiag_type;
912
913 if (type >= INET_DIAG_GETSOCK_MAX)
914 return;
915
916 mutex_lock(&inet_diag_table_mutex);
917 inet_diag_table[type] = NULL;
918 mutex_unlock(&inet_diag_table_mutex);
919 }
920 EXPORT_SYMBOL_GPL(inet_diag_unregister);
921
inet_diag_init(void)922 static int __init inet_diag_init(void)
923 {
924 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
925 sizeof(struct inet_diag_handler *));
926 int err = -ENOMEM;
927
928 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
929 if (!inet_diag_table)
930 goto out;
931
932 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
933 inet_diag_rcv, NULL, THIS_MODULE);
934 if (idiagnl == NULL)
935 goto out_free_table;
936 err = 0;
937 out:
938 return err;
939 out_free_table:
940 kfree(inet_diag_table);
941 goto out;
942 }
943
inet_diag_exit(void)944 static void __exit inet_diag_exit(void)
945 {
946 netlink_kernel_release(idiagnl);
947 kfree(inet_diag_table);
948 }
949
950 module_init(inet_diag_init);
951 module_exit(inet_diag_exit);
952 MODULE_LICENSE("GPL");
953 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
954