Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * tcp_diag.c Module for monitoring TCP sockets. | |
3 | * | |
4 | * Version: $Id: tcp_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $ | |
5 | * | |
6 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/fcntl.h> | |
18 | #include <linux/random.h> | |
19 | #include <linux/cache.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/time.h> | |
22 | ||
23 | #include <net/icmp.h> | |
24 | #include <net/tcp.h> | |
25 | #include <net/ipv6.h> | |
26 | #include <net/inet_common.h> | |
27 | ||
28 | #include <linux/inet.h> | |
29 | #include <linux/stddef.h> | |
30 | ||
31 | #include <linux/tcp_diag.h> | |
32 | ||
33 | struct tcpdiag_entry | |
34 | { | |
35 | u32 *saddr; | |
36 | u32 *daddr; | |
37 | u16 sport; | |
38 | u16 dport; | |
39 | u16 family; | |
40 | u16 userlocks; | |
41 | }; | |
42 | ||
43 | static struct sock *tcpnl; | |
44 | ||
1da177e4 | 45 | #define TCPDIAG_PUT(skb, attrtype, attrlen) \ |
7c99c909 | 46 | RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) |
1da177e4 LT |
47 | |
48 | static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk, | |
49 | int ext, u32 pid, u32 seq, u16 nlmsg_flags) | |
50 | { | |
51 | struct inet_sock *inet = inet_sk(sk); | |
52 | struct tcp_sock *tp = tcp_sk(sk); | |
53 | struct tcpdiagmsg *r; | |
54 | struct nlmsghdr *nlh; | |
55 | struct tcp_info *info = NULL; | |
56 | struct tcpdiag_meminfo *minfo = NULL; | |
1da177e4 LT |
57 | unsigned char *b = skb->tail; |
58 | ||
59 | nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); | |
60 | nlh->nlmsg_flags = nlmsg_flags; | |
61 | r = NLMSG_DATA(nlh); | |
62 | if (sk->sk_state != TCP_TIME_WAIT) { | |
63 | if (ext & (1<<(TCPDIAG_MEMINFO-1))) | |
64 | minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo)); | |
65 | if (ext & (1<<(TCPDIAG_INFO-1))) | |
66 | info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info)); | |
67 | ||
056ede6c SH |
68 | if (ext & (1<<(TCPDIAG_CONG-1))) { |
69 | size_t len = strlen(tp->ca_ops->name); | |
70 | strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1), | |
71 | tp->ca_ops->name); | |
72 | } | |
1da177e4 LT |
73 | } |
74 | r->tcpdiag_family = sk->sk_family; | |
75 | r->tcpdiag_state = sk->sk_state; | |
76 | r->tcpdiag_timer = 0; | |
77 | r->tcpdiag_retrans = 0; | |
78 | ||
79 | r->id.tcpdiag_if = sk->sk_bound_dev_if; | |
80 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk; | |
81 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); | |
82 | ||
83 | if (r->tcpdiag_state == TCP_TIME_WAIT) { | |
84 | struct tcp_tw_bucket *tw = (struct tcp_tw_bucket*)sk; | |
85 | long tmo = tw->tw_ttd - jiffies; | |
86 | if (tmo < 0) | |
87 | tmo = 0; | |
88 | ||
89 | r->id.tcpdiag_sport = tw->tw_sport; | |
90 | r->id.tcpdiag_dport = tw->tw_dport; | |
91 | r->id.tcpdiag_src[0] = tw->tw_rcv_saddr; | |
92 | r->id.tcpdiag_dst[0] = tw->tw_daddr; | |
93 | r->tcpdiag_state = tw->tw_substate; | |
94 | r->tcpdiag_timer = 3; | |
95 | r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ; | |
96 | r->tcpdiag_rqueue = 0; | |
97 | r->tcpdiag_wqueue = 0; | |
98 | r->tcpdiag_uid = 0; | |
99 | r->tcpdiag_inode = 0; | |
100 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
101 | if (r->tcpdiag_family == AF_INET6) { | |
102 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
103 | &tw->tw_v6_rcv_saddr); | |
104 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, | |
105 | &tw->tw_v6_daddr); | |
106 | } | |
107 | #endif | |
108 | nlh->nlmsg_len = skb->tail - b; | |
109 | return skb->len; | |
110 | } | |
111 | ||
112 | r->id.tcpdiag_sport = inet->sport; | |
113 | r->id.tcpdiag_dport = inet->dport; | |
114 | r->id.tcpdiag_src[0] = inet->rcv_saddr; | |
115 | r->id.tcpdiag_dst[0] = inet->daddr; | |
116 | ||
117 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
118 | if (r->tcpdiag_family == AF_INET6) { | |
119 | struct ipv6_pinfo *np = inet6_sk(sk); | |
120 | ||
121 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
122 | &np->rcv_saddr); | |
123 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, | |
124 | &np->daddr); | |
125 | } | |
126 | #endif | |
127 | ||
128 | #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ | |
129 | ||
130 | if (tp->pending == TCP_TIME_RETRANS) { | |
131 | r->tcpdiag_timer = 1; | |
132 | r->tcpdiag_retrans = tp->retransmits; | |
133 | r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout); | |
134 | } else if (tp->pending == TCP_TIME_PROBE0) { | |
135 | r->tcpdiag_timer = 4; | |
136 | r->tcpdiag_retrans = tp->probes_out; | |
137 | r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout); | |
138 | } else if (timer_pending(&sk->sk_timer)) { | |
139 | r->tcpdiag_timer = 2; | |
140 | r->tcpdiag_retrans = tp->probes_out; | |
141 | r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); | |
142 | } else { | |
143 | r->tcpdiag_timer = 0; | |
144 | r->tcpdiag_expires = 0; | |
145 | } | |
146 | #undef EXPIRES_IN_MS | |
147 | ||
148 | r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq; | |
149 | r->tcpdiag_wqueue = tp->write_seq - tp->snd_una; | |
150 | r->tcpdiag_uid = sock_i_uid(sk); | |
151 | r->tcpdiag_inode = sock_i_ino(sk); | |
152 | ||
153 | if (minfo) { | |
154 | minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc); | |
155 | minfo->tcpdiag_wmem = sk->sk_wmem_queued; | |
156 | minfo->tcpdiag_fmem = sk->sk_forward_alloc; | |
157 | minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc); | |
158 | } | |
159 | ||
160 | if (info) | |
161 | tcp_get_info(sk, info); | |
162 | ||
317a76f9 SH |
163 | if (sk->sk_state < TCP_TIME_WAIT && tp->ca_ops->get_info) |
164 | tp->ca_ops->get_info(tp, ext, skb); | |
1da177e4 LT |
165 | |
166 | nlh->nlmsg_len = skb->tail - b; | |
167 | return skb->len; | |
168 | ||
7c99c909 | 169 | rtattr_failure: |
1da177e4 LT |
170 | nlmsg_failure: |
171 | skb_trim(skb, b - skb->data); | |
172 | return -1; | |
173 | } | |
174 | ||
175 | extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport, | |
176 | int dif); | |
177 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
178 | extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
179 | struct in6_addr *daddr, u16 dport, | |
180 | int dif); | |
181 | #else | |
182 | static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
183 | struct in6_addr *daddr, u16 dport, | |
184 | int dif) | |
185 | { | |
186 | return NULL; | |
187 | } | |
188 | #endif | |
189 | ||
190 | static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) | |
191 | { | |
192 | int err; | |
193 | struct sock *sk; | |
194 | struct tcpdiagreq *req = NLMSG_DATA(nlh); | |
195 | struct sk_buff *rep; | |
196 | ||
197 | if (req->tcpdiag_family == AF_INET) { | |
198 | sk = tcp_v4_lookup(req->id.tcpdiag_dst[0], req->id.tcpdiag_dport, | |
199 | req->id.tcpdiag_src[0], req->id.tcpdiag_sport, | |
200 | req->id.tcpdiag_if); | |
201 | } | |
202 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
203 | else if (req->tcpdiag_family == AF_INET6) { | |
204 | sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport, | |
205 | (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport, | |
206 | req->id.tcpdiag_if); | |
207 | } | |
208 | #endif | |
209 | else { | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | if (sk == NULL) | |
214 | return -ENOENT; | |
215 | ||
216 | err = -ESTALE; | |
217 | if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE || | |
218 | req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) && | |
219 | ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] || | |
220 | (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1])) | |
221 | goto out; | |
222 | ||
223 | err = -ENOMEM; | |
224 | rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+ | |
225 | sizeof(struct tcpdiag_meminfo)+ | |
226 | sizeof(struct tcp_info)+64), GFP_KERNEL); | |
227 | if (!rep) | |
228 | goto out; | |
229 | ||
230 | if (tcpdiag_fill(rep, sk, req->tcpdiag_ext, | |
231 | NETLINK_CB(in_skb).pid, | |
232 | nlh->nlmsg_seq, 0) <= 0) | |
233 | BUG(); | |
234 | ||
235 | err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
236 | if (err > 0) | |
237 | err = 0; | |
238 | ||
239 | out: | |
240 | if (sk) { | |
241 | if (sk->sk_state == TCP_TIME_WAIT) | |
242 | tcp_tw_put((struct tcp_tw_bucket*)sk); | |
243 | else | |
244 | sock_put(sk); | |
245 | } | |
246 | return err; | |
247 | } | |
248 | ||
249 | static int bitstring_match(const u32 *a1, const u32 *a2, int bits) | |
250 | { | |
251 | int words = bits >> 5; | |
252 | ||
253 | bits &= 0x1f; | |
254 | ||
255 | if (words) { | |
256 | if (memcmp(a1, a2, words << 2)) | |
257 | return 0; | |
258 | } | |
259 | if (bits) { | |
260 | __u32 w1, w2; | |
261 | __u32 mask; | |
262 | ||
263 | w1 = a1[words]; | |
264 | w2 = a2[words]; | |
265 | ||
266 | mask = htonl((0xffffffff) << (32 - bits)); | |
267 | ||
268 | if ((w1 ^ w2) & mask) | |
269 | return 0; | |
270 | } | |
271 | ||
272 | return 1; | |
273 | } | |
274 | ||
275 | ||
276 | static int tcpdiag_bc_run(const void *bc, int len, | |
277 | const struct tcpdiag_entry *entry) | |
278 | { | |
279 | while (len > 0) { | |
280 | int yes = 1; | |
281 | const struct tcpdiag_bc_op *op = bc; | |
282 | ||
283 | switch (op->code) { | |
284 | case TCPDIAG_BC_NOP: | |
285 | break; | |
286 | case TCPDIAG_BC_JMP: | |
287 | yes = 0; | |
288 | break; | |
289 | case TCPDIAG_BC_S_GE: | |
290 | yes = entry->sport >= op[1].no; | |
291 | break; | |
292 | case TCPDIAG_BC_S_LE: | |
293 | yes = entry->dport <= op[1].no; | |
294 | break; | |
295 | case TCPDIAG_BC_D_GE: | |
296 | yes = entry->dport >= op[1].no; | |
297 | break; | |
298 | case TCPDIAG_BC_D_LE: | |
299 | yes = entry->dport <= op[1].no; | |
300 | break; | |
301 | case TCPDIAG_BC_AUTO: | |
302 | yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); | |
303 | break; | |
304 | case TCPDIAG_BC_S_COND: | |
305 | case TCPDIAG_BC_D_COND: | |
306 | { | |
307 | struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1); | |
308 | u32 *addr; | |
309 | ||
310 | if (cond->port != -1 && | |
311 | cond->port != (op->code == TCPDIAG_BC_S_COND ? | |
312 | entry->sport : entry->dport)) { | |
313 | yes = 0; | |
314 | break; | |
315 | } | |
316 | ||
317 | if (cond->prefix_len == 0) | |
318 | break; | |
319 | ||
320 | if (op->code == TCPDIAG_BC_S_COND) | |
321 | addr = entry->saddr; | |
322 | else | |
323 | addr = entry->daddr; | |
324 | ||
325 | if (bitstring_match(addr, cond->addr, cond->prefix_len)) | |
326 | break; | |
327 | if (entry->family == AF_INET6 && | |
328 | cond->family == AF_INET) { | |
329 | if (addr[0] == 0 && addr[1] == 0 && | |
330 | addr[2] == htonl(0xffff) && | |
331 | bitstring_match(addr+3, cond->addr, cond->prefix_len)) | |
332 | break; | |
333 | } | |
334 | yes = 0; | |
335 | break; | |
336 | } | |
337 | } | |
338 | ||
339 | if (yes) { | |
340 | len -= op->yes; | |
341 | bc += op->yes; | |
342 | } else { | |
343 | len -= op->no; | |
344 | bc += op->no; | |
345 | } | |
346 | } | |
347 | return (len == 0); | |
348 | } | |
349 | ||
350 | static int valid_cc(const void *bc, int len, int cc) | |
351 | { | |
352 | while (len >= 0) { | |
353 | const struct tcpdiag_bc_op *op = bc; | |
354 | ||
355 | if (cc > len) | |
356 | return 0; | |
357 | if (cc == len) | |
358 | return 1; | |
359 | if (op->yes < 4) | |
360 | return 0; | |
361 | len -= op->yes; | |
362 | bc += op->yes; | |
363 | } | |
364 | return 0; | |
365 | } | |
366 | ||
367 | static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len) | |
368 | { | |
369 | const unsigned char *bc = bytecode; | |
370 | int len = bytecode_len; | |
371 | ||
372 | while (len > 0) { | |
373 | struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc; | |
374 | ||
375 | //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); | |
376 | switch (op->code) { | |
377 | case TCPDIAG_BC_AUTO: | |
378 | case TCPDIAG_BC_S_COND: | |
379 | case TCPDIAG_BC_D_COND: | |
380 | case TCPDIAG_BC_S_GE: | |
381 | case TCPDIAG_BC_S_LE: | |
382 | case TCPDIAG_BC_D_GE: | |
383 | case TCPDIAG_BC_D_LE: | |
384 | if (op->yes < 4 || op->yes > len+4) | |
385 | return -EINVAL; | |
386 | case TCPDIAG_BC_JMP: | |
387 | if (op->no < 4 || op->no > len+4) | |
388 | return -EINVAL; | |
389 | if (op->no < len && | |
390 | !valid_cc(bytecode, bytecode_len, len-op->no)) | |
391 | return -EINVAL; | |
392 | break; | |
393 | case TCPDIAG_BC_NOP: | |
394 | if (op->yes < 4 || op->yes > len+4) | |
395 | return -EINVAL; | |
396 | break; | |
397 | default: | |
398 | return -EINVAL; | |
399 | } | |
400 | bc += op->yes; | |
401 | len -= op->yes; | |
402 | } | |
403 | return len == 0 ? 0 : -EINVAL; | |
404 | } | |
405 | ||
406 | static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk, | |
407 | struct netlink_callback *cb) | |
408 | { | |
409 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
410 | ||
411 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
412 | struct tcpdiag_entry entry; | |
413 | struct rtattr *bc = (struct rtattr *)(r + 1); | |
414 | struct inet_sock *inet = inet_sk(sk); | |
415 | ||
416 | entry.family = sk->sk_family; | |
417 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
418 | if (entry.family == AF_INET6) { | |
419 | struct ipv6_pinfo *np = inet6_sk(sk); | |
420 | ||
421 | entry.saddr = np->rcv_saddr.s6_addr32; | |
422 | entry.daddr = np->daddr.s6_addr32; | |
423 | } else | |
424 | #endif | |
425 | { | |
426 | entry.saddr = &inet->rcv_saddr; | |
427 | entry.daddr = &inet->daddr; | |
428 | } | |
429 | entry.sport = inet->num; | |
430 | entry.dport = ntohs(inet->dport); | |
431 | entry.userlocks = sk->sk_userlocks; | |
432 | ||
433 | if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) | |
434 | return 0; | |
435 | } | |
436 | ||
437 | return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid, | |
438 | cb->nlh->nlmsg_seq, NLM_F_MULTI); | |
439 | } | |
440 | ||
441 | static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk, | |
60236fdd | 442 | struct request_sock *req, |
1da177e4 LT |
443 | u32 pid, u32 seq) |
444 | { | |
2e6599cb | 445 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
446 | struct inet_sock *inet = inet_sk(sk); |
447 | unsigned char *b = skb->tail; | |
448 | struct tcpdiagmsg *r; | |
449 | struct nlmsghdr *nlh; | |
450 | long tmo; | |
451 | ||
452 | nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); | |
453 | nlh->nlmsg_flags = NLM_F_MULTI; | |
454 | r = NLMSG_DATA(nlh); | |
455 | ||
456 | r->tcpdiag_family = sk->sk_family; | |
457 | r->tcpdiag_state = TCP_SYN_RECV; | |
458 | r->tcpdiag_timer = 1; | |
459 | r->tcpdiag_retrans = req->retrans; | |
460 | ||
461 | r->id.tcpdiag_if = sk->sk_bound_dev_if; | |
462 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req; | |
463 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); | |
464 | ||
465 | tmo = req->expires - jiffies; | |
466 | if (tmo < 0) | |
467 | tmo = 0; | |
468 | ||
469 | r->id.tcpdiag_sport = inet->sport; | |
2e6599cb ACM |
470 | r->id.tcpdiag_dport = ireq->rmt_port; |
471 | r->id.tcpdiag_src[0] = ireq->loc_addr; | |
472 | r->id.tcpdiag_dst[0] = ireq->rmt_addr; | |
1da177e4 LT |
473 | r->tcpdiag_expires = jiffies_to_msecs(tmo), |
474 | r->tcpdiag_rqueue = 0; | |
475 | r->tcpdiag_wqueue = 0; | |
476 | r->tcpdiag_uid = sock_i_uid(sk); | |
477 | r->tcpdiag_inode = 0; | |
478 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
479 | if (r->tcpdiag_family == AF_INET6) { | |
480 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
2e6599cb | 481 | &tcp6_rsk(req)->loc_addr); |
1da177e4 | 482 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, |
2e6599cb | 483 | &tcp6_rsk(req)->rmt_addr); |
1da177e4 LT |
484 | } |
485 | #endif | |
486 | nlh->nlmsg_len = skb->tail - b; | |
487 | ||
488 | return skb->len; | |
489 | ||
490 | nlmsg_failure: | |
491 | skb_trim(skb, b - skb->data); | |
492 | return -1; | |
493 | } | |
494 | ||
495 | static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk, | |
496 | struct netlink_callback *cb) | |
497 | { | |
498 | struct tcpdiag_entry entry; | |
499 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
500 | struct tcp_sock *tp = tcp_sk(sk); | |
2ad69c55 | 501 | struct listen_sock *lopt; |
1da177e4 LT |
502 | struct rtattr *bc = NULL; |
503 | struct inet_sock *inet = inet_sk(sk); | |
504 | int j, s_j; | |
505 | int reqnum, s_reqnum; | |
506 | int err = 0; | |
507 | ||
508 | s_j = cb->args[3]; | |
509 | s_reqnum = cb->args[4]; | |
510 | ||
511 | if (s_j > 0) | |
512 | s_j--; | |
513 | ||
514 | entry.family = sk->sk_family; | |
515 | ||
0e87506f | 516 | read_lock_bh(&tp->accept_queue.syn_wait_lock); |
1da177e4 | 517 | |
0e87506f | 518 | lopt = tp->accept_queue.listen_opt; |
1da177e4 LT |
519 | if (!lopt || !lopt->qlen) |
520 | goto out; | |
521 | ||
522 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
523 | bc = (struct rtattr *)(r + 1); | |
524 | entry.sport = inet->num; | |
525 | entry.userlocks = sk->sk_userlocks; | |
526 | } | |
527 | ||
528 | for (j = s_j; j < TCP_SYNQ_HSIZE; j++) { | |
60236fdd | 529 | struct request_sock *req, *head = lopt->syn_table[j]; |
1da177e4 LT |
530 | |
531 | reqnum = 0; | |
532 | for (req = head; req; reqnum++, req = req->dl_next) { | |
2e6599cb ACM |
533 | struct inet_request_sock *ireq = inet_rsk(req); |
534 | ||
1da177e4 LT |
535 | if (reqnum < s_reqnum) |
536 | continue; | |
2e6599cb | 537 | if (r->id.tcpdiag_dport != ireq->rmt_port && |
1da177e4 LT |
538 | r->id.tcpdiag_dport) |
539 | continue; | |
540 | ||
541 | if (bc) { | |
542 | entry.saddr = | |
543 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
544 | (entry.family == AF_INET6) ? | |
2e6599cb | 545 | tcp6_rsk(req)->loc_addr.s6_addr32 : |
1da177e4 | 546 | #endif |
2e6599cb | 547 | &ireq->loc_addr; |
1da177e4 LT |
548 | entry.daddr = |
549 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
550 | (entry.family == AF_INET6) ? | |
2e6599cb | 551 | tcp6_rsk(req)->rmt_addr.s6_addr32 : |
1da177e4 | 552 | #endif |
2e6599cb ACM |
553 | &ireq->rmt_addr; |
554 | entry.dport = ntohs(ireq->rmt_port); | |
1da177e4 LT |
555 | |
556 | if (!tcpdiag_bc_run(RTA_DATA(bc), | |
557 | RTA_PAYLOAD(bc), &entry)) | |
558 | continue; | |
559 | } | |
560 | ||
561 | err = tcpdiag_fill_req(skb, sk, req, | |
562 | NETLINK_CB(cb->skb).pid, | |
563 | cb->nlh->nlmsg_seq); | |
564 | if (err < 0) { | |
565 | cb->args[3] = j + 1; | |
566 | cb->args[4] = reqnum; | |
567 | goto out; | |
568 | } | |
569 | } | |
570 | ||
571 | s_reqnum = 0; | |
572 | } | |
573 | ||
574 | out: | |
0e87506f | 575 | read_unlock_bh(&tp->accept_queue.syn_wait_lock); |
1da177e4 LT |
576 | |
577 | return err; | |
578 | } | |
579 | ||
580 | static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
581 | { | |
582 | int i, num; | |
583 | int s_i, s_num; | |
584 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
585 | ||
586 | s_i = cb->args[1]; | |
587 | s_num = num = cb->args[2]; | |
588 | ||
589 | if (cb->args[0] == 0) { | |
590 | if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV))) | |
591 | goto skip_listen_ht; | |
592 | tcp_listen_lock(); | |
593 | for (i = s_i; i < TCP_LHTABLE_SIZE; i++) { | |
594 | struct sock *sk; | |
595 | struct hlist_node *node; | |
596 | ||
597 | num = 0; | |
598 | sk_for_each(sk, node, &tcp_listening_hash[i]) { | |
599 | struct inet_sock *inet = inet_sk(sk); | |
600 | ||
601 | if (num < s_num) { | |
602 | num++; | |
603 | continue; | |
604 | } | |
605 | ||
606 | if (r->id.tcpdiag_sport != inet->sport && | |
607 | r->id.tcpdiag_sport) | |
608 | goto next_listen; | |
609 | ||
610 | if (!(r->tcpdiag_states&TCPF_LISTEN) || | |
611 | r->id.tcpdiag_dport || | |
612 | cb->args[3] > 0) | |
613 | goto syn_recv; | |
614 | ||
615 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
616 | tcp_listen_unlock(); | |
617 | goto done; | |
618 | } | |
619 | ||
620 | syn_recv: | |
621 | if (!(r->tcpdiag_states&TCPF_SYN_RECV)) | |
622 | goto next_listen; | |
623 | ||
624 | if (tcpdiag_dump_reqs(skb, sk, cb) < 0) { | |
625 | tcp_listen_unlock(); | |
626 | goto done; | |
627 | } | |
628 | ||
629 | next_listen: | |
630 | cb->args[3] = 0; | |
631 | cb->args[4] = 0; | |
632 | ++num; | |
633 | } | |
634 | ||
635 | s_num = 0; | |
636 | cb->args[3] = 0; | |
637 | cb->args[4] = 0; | |
638 | } | |
639 | tcp_listen_unlock(); | |
640 | skip_listen_ht: | |
641 | cb->args[0] = 1; | |
642 | s_i = num = s_num = 0; | |
643 | } | |
644 | ||
645 | if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV))) | |
646 | return skb->len; | |
647 | ||
648 | for (i = s_i; i < tcp_ehash_size; i++) { | |
649 | struct tcp_ehash_bucket *head = &tcp_ehash[i]; | |
650 | struct sock *sk; | |
651 | struct hlist_node *node; | |
652 | ||
653 | if (i > s_i) | |
654 | s_num = 0; | |
655 | ||
656 | read_lock_bh(&head->lock); | |
657 | ||
658 | num = 0; | |
659 | sk_for_each(sk, node, &head->chain) { | |
660 | struct inet_sock *inet = inet_sk(sk); | |
661 | ||
662 | if (num < s_num) | |
663 | goto next_normal; | |
664 | if (!(r->tcpdiag_states & (1 << sk->sk_state))) | |
665 | goto next_normal; | |
666 | if (r->id.tcpdiag_sport != inet->sport && | |
667 | r->id.tcpdiag_sport) | |
668 | goto next_normal; | |
669 | if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport) | |
670 | goto next_normal; | |
671 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
672 | read_unlock_bh(&head->lock); | |
673 | goto done; | |
674 | } | |
675 | next_normal: | |
676 | ++num; | |
677 | } | |
678 | ||
679 | if (r->tcpdiag_states&TCPF_TIME_WAIT) { | |
680 | sk_for_each(sk, node, | |
681 | &tcp_ehash[i + tcp_ehash_size].chain) { | |
682 | struct inet_sock *inet = inet_sk(sk); | |
683 | ||
684 | if (num < s_num) | |
685 | goto next_dying; | |
686 | if (r->id.tcpdiag_sport != inet->sport && | |
687 | r->id.tcpdiag_sport) | |
688 | goto next_dying; | |
689 | if (r->id.tcpdiag_dport != inet->dport && | |
690 | r->id.tcpdiag_dport) | |
691 | goto next_dying; | |
692 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
693 | read_unlock_bh(&head->lock); | |
694 | goto done; | |
695 | } | |
696 | next_dying: | |
697 | ++num; | |
698 | } | |
699 | } | |
700 | read_unlock_bh(&head->lock); | |
701 | } | |
702 | ||
703 | done: | |
704 | cb->args[1] = i; | |
705 | cb->args[2] = num; | |
706 | return skb->len; | |
707 | } | |
708 | ||
709 | static int tcpdiag_dump_done(struct netlink_callback *cb) | |
710 | { | |
711 | return 0; | |
712 | } | |
713 | ||
714 | ||
715 | static __inline__ int | |
716 | tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
717 | { | |
718 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
719 | return 0; | |
720 | ||
721 | if (nlh->nlmsg_type != TCPDIAG_GETSOCK) | |
722 | goto err_inval; | |
723 | ||
724 | if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len) | |
725 | goto err_inval; | |
726 | ||
727 | if (nlh->nlmsg_flags&NLM_F_DUMP) { | |
728 | if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) { | |
729 | struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq)); | |
730 | if (rta->rta_type != TCPDIAG_REQ_BYTECODE || | |
731 | rta->rta_len < 8 || | |
732 | rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq))) | |
733 | goto err_inval; | |
734 | if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) | |
735 | goto err_inval; | |
736 | } | |
737 | return netlink_dump_start(tcpnl, skb, nlh, | |
738 | tcpdiag_dump, | |
739 | tcpdiag_dump_done); | |
740 | } else { | |
741 | return tcpdiag_get_exact(skb, nlh); | |
742 | } | |
743 | ||
744 | err_inval: | |
745 | return -EINVAL; | |
746 | } | |
747 | ||
748 | ||
749 | static inline void tcpdiag_rcv_skb(struct sk_buff *skb) | |
750 | { | |
751 | int err; | |
752 | struct nlmsghdr * nlh; | |
753 | ||
754 | if (skb->len >= NLMSG_SPACE(0)) { | |
755 | nlh = (struct nlmsghdr *)skb->data; | |
756 | if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) | |
757 | return; | |
758 | err = tcpdiag_rcv_msg(skb, nlh); | |
759 | if (err || nlh->nlmsg_flags & NLM_F_ACK) | |
760 | netlink_ack(skb, nlh, err); | |
761 | } | |
762 | } | |
763 | ||
764 | static void tcpdiag_rcv(struct sock *sk, int len) | |
765 | { | |
766 | struct sk_buff *skb; | |
2a0a6ebe | 767 | unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); |
1da177e4 | 768 | |
2a0a6ebe | 769 | while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) { |
1da177e4 LT |
770 | tcpdiag_rcv_skb(skb); |
771 | kfree_skb(skb); | |
772 | } | |
773 | } | |
774 | ||
775 | static int __init tcpdiag_init(void) | |
776 | { | |
4fdb3bb7 HW |
777 | tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv, |
778 | THIS_MODULE); | |
1da177e4 LT |
779 | if (tcpnl == NULL) |
780 | return -ENOMEM; | |
781 | return 0; | |
782 | } | |
783 | ||
784 | static void __exit tcpdiag_exit(void) | |
785 | { | |
786 | sock_release(tcpnl->sk_socket); | |
787 | } | |
788 | ||
789 | module_init(tcpdiag_init); | |
790 | module_exit(tcpdiag_exit); | |
791 | MODULE_LICENSE("GPL"); |