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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/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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { |
494 | struct inet_diag_entry entry; |
495 | struct rtattr *bc = (struct rtattr *)(r + 1); |
496 | struct inet_sock *inet = inet_sk(sk); |
497 | |
498 | entry.family = sk->sk_family; |
499 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
500 | if (entry.family == AF_INET6) { |
501 | struct ipv6_pinfo *np = inet6_sk(sk); |
502 | |
503 | entry.saddr = np->rcv_saddr.s6_addr32; |
504 | entry.daddr = np->daddr.s6_addr32; |
505 | } else |
506 | #endif |
507 | { |
508 | entry.saddr = &inet->inet_rcv_saddr; |
509 | entry.daddr = &inet->inet_daddr; |
510 | } |
511 | entry.sport = inet->inet_num; |
512 | entry.dport = ntohs(inet->inet_dport); |
513 | entry.userlocks = sk->sk_userlocks; |
514 | |
515 | if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) |
516 | return 0; |
517 | } |
518 | |
519 | return inet_csk_diag_fill(sk, skb, r->idiag_ext, |
520 | NETLINK_CB(cb->skb).pid, |
521 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
522 | } |
523 | |
524 | static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, |
525 | struct sk_buff *skb, |
526 | struct netlink_callback *cb) |
527 | { |
528 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
529 | |
530 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { |
531 | struct inet_diag_entry entry; |
532 | struct rtattr *bc = (struct rtattr *)(r + 1); |
533 | |
534 | entry.family = tw->tw_family; |
535 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
536 | if (tw->tw_family == AF_INET6) { |
537 | struct inet6_timewait_sock *tw6 = |
538 | inet6_twsk((struct sock *)tw); |
539 | entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; |
540 | entry.daddr = tw6->tw_v6_daddr.s6_addr32; |
541 | } else |
542 | #endif |
543 | { |
544 | entry.saddr = &tw->tw_rcv_saddr; |
545 | entry.daddr = &tw->tw_daddr; |
546 | } |
547 | entry.sport = tw->tw_num; |
548 | entry.dport = ntohs(tw->tw_dport); |
549 | entry.userlocks = 0; |
550 | |
551 | if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) |
552 | return 0; |
553 | } |
554 | |
555 | return inet_twsk_diag_fill(tw, skb, r->idiag_ext, |
556 | NETLINK_CB(cb->skb).pid, |
557 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
558 | } |
559 | |
560 | static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, |
561 | struct request_sock *req, u32 pid, u32 seq, |
562 | const struct nlmsghdr *unlh) |
563 | { |
564 | const struct inet_request_sock *ireq = inet_rsk(req); |
565 | struct inet_sock *inet = inet_sk(sk); |
566 | unsigned char *b = skb_tail_pointer(skb); |
567 | struct inet_diag_msg *r; |
568 | struct nlmsghdr *nlh; |
569 | long tmo; |
570 | |
571 | nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); |
572 | nlh->nlmsg_flags = NLM_F_MULTI; |
573 | r = NLMSG_DATA(nlh); |
574 | |
575 | r->idiag_family = sk->sk_family; |
576 | r->idiag_state = TCP_SYN_RECV; |
577 | r->idiag_timer = 1; |
578 | r->idiag_retrans = req->retrans; |
579 | |
580 | r->id.idiag_if = sk->sk_bound_dev_if; |
581 | r->id.idiag_cookie[0] = (u32)(unsigned long)req; |
582 | r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); |
583 | |
584 | tmo = req->expires - jiffies; |
585 | if (tmo < 0) |
586 | tmo = 0; |
587 | |
588 | r->id.idiag_sport = inet->inet_sport; |
589 | r->id.idiag_dport = ireq->rmt_port; |
590 | r->id.idiag_src[0] = ireq->loc_addr; |
591 | r->id.idiag_dst[0] = ireq->rmt_addr; |
592 | r->idiag_expires = jiffies_to_msecs(tmo); |
593 | r->idiag_rqueue = 0; |
594 | r->idiag_wqueue = 0; |
595 | r->idiag_uid = sock_i_uid(sk); |
596 | r->idiag_inode = 0; |
597 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
598 | if (r->idiag_family == AF_INET6) { |
599 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, |
600 | &inet6_rsk(req)->loc_addr); |
601 | ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, |
602 | &inet6_rsk(req)->rmt_addr); |
603 | } |
604 | #endif |
605 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
606 | |
607 | return skb->len; |
608 | |
609 | nlmsg_failure: |
610 | nlmsg_trim(skb, b); |
611 | return -1; |
612 | } |
613 | |
614 | static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, |
615 | struct netlink_callback *cb) |
616 | { |
617 | struct inet_diag_entry entry; |
618 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
619 | struct inet_connection_sock *icsk = inet_csk(sk); |
620 | struct listen_sock *lopt; |
621 | struct rtattr *bc = NULL; |
622 | struct inet_sock *inet = inet_sk(sk); |
623 | int j, s_j; |
624 | int reqnum, s_reqnum; |
625 | int err = 0; |
626 | |
627 | s_j = cb->args[3]; |
628 | s_reqnum = cb->args[4]; |
629 | |
630 | if (s_j > 0) |
631 | s_j--; |
632 | |
633 | entry.family = sk->sk_family; |
634 | |
635 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
636 | |
637 | lopt = icsk->icsk_accept_queue.listen_opt; |
638 | if (!lopt || !lopt->qlen) |
639 | goto out; |
640 | |
641 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { |
642 | bc = (struct rtattr *)(r + 1); |
643 | entry.sport = inet->inet_num; |
644 | entry.userlocks = sk->sk_userlocks; |
645 | } |
646 | |
647 | for (j = s_j; j < lopt->nr_table_entries; j++) { |
648 | struct request_sock *req, *head = lopt->syn_table[j]; |
649 | |
650 | reqnum = 0; |
651 | for (req = head; req; reqnum++, req = req->dl_next) { |
652 | struct inet_request_sock *ireq = inet_rsk(req); |
653 | |
654 | if (reqnum < s_reqnum) |
655 | continue; |
656 | if (r->id.idiag_dport != ireq->rmt_port && |
657 | r->id.idiag_dport) |
658 | continue; |
659 | |
660 | if (bc) { |
661 | entry.saddr = |
662 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
663 | (entry.family == AF_INET6) ? |
664 | inet6_rsk(req)->loc_addr.s6_addr32 : |
665 | #endif |
666 | &ireq->loc_addr; |
667 | entry.daddr = |
668 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
669 | (entry.family == AF_INET6) ? |
670 | inet6_rsk(req)->rmt_addr.s6_addr32 : |
671 | #endif |
672 | &ireq->rmt_addr; |
673 | entry.dport = ntohs(ireq->rmt_port); |
674 | |
675 | if (!inet_diag_bc_run(RTA_DATA(bc), |
676 | RTA_PAYLOAD(bc), &entry)) |
677 | continue; |
678 | } |
679 | |
680 | err = inet_diag_fill_req(skb, sk, req, |
681 | NETLINK_CB(cb->skb).pid, |
682 | cb->nlh->nlmsg_seq, cb->nlh); |
683 | if (err < 0) { |
684 | cb->args[3] = j + 1; |
685 | cb->args[4] = reqnum; |
686 | goto out; |
687 | } |
688 | } |
689 | |
690 | s_reqnum = 0; |
691 | } |
692 | |
693 | out: |
694 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
695 | |
696 | return err; |
697 | } |
698 | |
699 | static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
700 | { |
701 | int i, num; |
702 | int s_i, s_num; |
703 | struct inet_diag_req *r = NLMSG_DATA(cb->nlh); |
704 | const struct inet_diag_handler *handler; |
705 | struct inet_hashinfo *hashinfo; |
706 | |
707 | handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); |
708 | if (IS_ERR(handler)) |
709 | goto unlock; |
710 | |
711 | hashinfo = handler->idiag_hashinfo; |
712 | |
713 | s_i = cb->args[1]; |
714 | s_num = num = cb->args[2]; |
715 | |
716 | if (cb->args[0] == 0) { |
717 | if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) |
718 | goto skip_listen_ht; |
719 | |
720 | for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
721 | struct sock *sk; |
722 | struct hlist_nulls_node *node; |
723 | struct inet_listen_hashbucket *ilb; |
724 | |
725 | num = 0; |
726 | ilb = &hashinfo->listening_hash[i]; |
727 | spin_lock_bh(&ilb->lock); |
728 | sk_nulls_for_each(sk, node, &ilb->head) { |
729 | struct inet_sock *inet = inet_sk(sk); |
730 | |
731 | if (num < s_num) { |
732 | num++; |
733 | continue; |
734 | } |
735 | |
736 | if (r->id.idiag_sport != inet->inet_sport && |
737 | r->id.idiag_sport) |
738 | goto next_listen; |
739 | |
740 | if (!(r->idiag_states & TCPF_LISTEN) || |
741 | r->id.idiag_dport || |
742 | cb->args[3] > 0) |
743 | goto syn_recv; |
744 | |
745 | if (inet_csk_diag_dump(sk, skb, cb) < 0) { |
746 | spin_unlock_bh(&ilb->lock); |
747 | goto done; |
748 | } |
749 | |
750 | syn_recv: |
751 | if (!(r->idiag_states & TCPF_SYN_RECV)) |
752 | goto next_listen; |
753 | |
754 | if (inet_diag_dump_reqs(skb, sk, cb) < 0) { |
755 | spin_unlock_bh(&ilb->lock); |
756 | goto done; |
757 | } |
758 | |
759 | next_listen: |
760 | cb->args[3] = 0; |
761 | cb->args[4] = 0; |
762 | ++num; |
763 | } |
764 | spin_unlock_bh(&ilb->lock); |
765 | |
766 | s_num = 0; |
767 | cb->args[3] = 0; |
768 | cb->args[4] = 0; |
769 | } |
770 | skip_listen_ht: |
771 | cb->args[0] = 1; |
772 | s_i = num = s_num = 0; |
773 | } |
774 | |
775 | if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) |
776 | goto unlock; |
777 | |
778 | for (i = s_i; i <= hashinfo->ehash_mask; i++) { |
779 | struct inet_ehash_bucket *head = &hashinfo->ehash[i]; |
780 | spinlock_t *lock = inet_ehash_lockp(hashinfo, i); |
781 | struct sock *sk; |
782 | struct hlist_nulls_node *node; |
783 | |
784 | num = 0; |
785 | |
786 | if (hlist_nulls_empty(&head->chain) && |
787 | hlist_nulls_empty(&head->twchain)) |
788 | continue; |
789 | |
790 | if (i > s_i) |
791 | s_num = 0; |
792 | |
793 | spin_lock_bh(lock); |
794 | sk_nulls_for_each(sk, node, &head->chain) { |
795 | struct inet_sock *inet = inet_sk(sk); |
796 | |
797 | if (num < s_num) |
798 | goto next_normal; |
799 | if (!(r->idiag_states & (1 << sk->sk_state))) |
800 | goto next_normal; |
801 | if (r->id.idiag_sport != inet->inet_sport && |
802 | r->id.idiag_sport) |
803 | goto next_normal; |
804 | if (r->id.idiag_dport != inet->inet_dport && |
805 | r->id.idiag_dport) |
806 | goto next_normal; |
807 | if (inet_csk_diag_dump(sk, skb, cb) < 0) { |
808 | spin_unlock_bh(lock); |
809 | goto done; |
810 | } |
811 | next_normal: |
812 | ++num; |
813 | } |
814 | |
815 | if (r->idiag_states & TCPF_TIME_WAIT) { |
816 | struct inet_timewait_sock *tw; |
817 | |
818 | inet_twsk_for_each(tw, node, |
819 | &head->twchain) { |
820 | |
821 | if (num < s_num) |
822 | goto next_dying; |
823 | if (r->id.idiag_sport != tw->tw_sport && |
824 | r->id.idiag_sport) |
825 | goto next_dying; |
826 | if (r->id.idiag_dport != tw->tw_dport && |
827 | r->id.idiag_dport) |
828 | goto next_dying; |
829 | if (inet_twsk_diag_dump(tw, skb, cb) < 0) { |
830 | spin_unlock_bh(lock); |
831 | goto done; |
832 | } |
833 | next_dying: |
834 | ++num; |
835 | } |
836 | } |
837 | spin_unlock_bh(lock); |
838 | } |
839 | |
840 | done: |
841 | cb->args[1] = i; |
842 | cb->args[2] = num; |
843 | unlock: |
844 | inet_diag_unlock_handler(handler); |
845 | return skb->len; |
846 | } |
847 | |
848 | static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
849 | { |
850 | int hdrlen = sizeof(struct inet_diag_req); |
851 | |
852 | if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || |
853 | nlmsg_len(nlh) < hdrlen) |
854 | return -EINVAL; |
855 | |
856 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
857 | if (nlmsg_attrlen(nlh, hdrlen)) { |
858 | struct nlattr *attr; |
859 | |
860 | attr = nlmsg_find_attr(nlh, hdrlen, |
861 | INET_DIAG_REQ_BYTECODE); |
862 | if (attr == NULL || |
863 | nla_len(attr) < sizeof(struct inet_diag_bc_op) || |
864 | inet_diag_bc_audit(nla_data(attr), nla_len(attr))) |
865 | return -EINVAL; |
866 | } |
867 | |
868 | return netlink_dump_start(idiagnl, skb, nlh, |
869 | inet_diag_dump, NULL); |
870 | } |
871 | |
872 | return inet_diag_get_exact(skb, nlh); |
873 | } |
874 | |
875 | static DEFINE_MUTEX(inet_diag_mutex); |
876 | |
877 | static void inet_diag_rcv(struct sk_buff *skb) |
878 | { |
879 | mutex_lock(&inet_diag_mutex); |
880 | netlink_rcv_skb(skb, &inet_diag_rcv_msg); |
881 | mutex_unlock(&inet_diag_mutex); |
882 | } |
883 | |
884 | int inet_diag_register(const struct inet_diag_handler *h) |
885 | { |
886 | const __u16 type = h->idiag_type; |
887 | int err = -EINVAL; |
888 | |
889 | if (type >= INET_DIAG_GETSOCK_MAX) |
890 | goto out; |
891 | |
892 | mutex_lock(&inet_diag_table_mutex); |
893 | err = -EEXIST; |
894 | if (inet_diag_table[type] == NULL) { |
895 | inet_diag_table[type] = h; |
896 | err = 0; |
897 | } |
898 | mutex_unlock(&inet_diag_table_mutex); |
899 | out: |
900 | return err; |
901 | } |
902 | EXPORT_SYMBOL_GPL(inet_diag_register); |
903 | |
904 | void inet_diag_unregister(const struct inet_diag_handler *h) |
905 | { |
906 | const __u16 type = h->idiag_type; |
907 | |
908 | if (type >= INET_DIAG_GETSOCK_MAX) |
909 | return; |
910 | |
911 | mutex_lock(&inet_diag_table_mutex); |
912 | inet_diag_table[type] = NULL; |
913 | mutex_unlock(&inet_diag_table_mutex); |
914 | } |
915 | EXPORT_SYMBOL_GPL(inet_diag_unregister); |
916 | |
917 | static int __init inet_diag_init(void) |
918 | { |
919 | const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * |
920 | sizeof(struct inet_diag_handler *)); |
921 | int err = -ENOMEM; |
922 | |
923 | inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); |
924 | if (!inet_diag_table) |
925 | goto out; |
926 | |
927 | idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, |
928 | inet_diag_rcv, NULL, THIS_MODULE); |
929 | if (idiagnl == NULL) |
930 | goto out_free_table; |
931 | err = 0; |
932 | out: |
933 | return err; |
934 | out_free_table: |
935 | kfree(inet_diag_table); |
936 | goto out; |
937 | } |
938 | |
939 | static void __exit inet_diag_exit(void) |
940 | { |
941 | netlink_kernel_release(idiagnl); |
942 | kfree(inet_diag_table); |
943 | } |
944 | |
945 | module_init(inet_diag_init); |
946 | module_exit(inet_diag_exit); |
947 | MODULE_LICENSE("GPL"); |
948 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); |
949 |
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