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