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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 | { | |
463c84b9 | 51 | const struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 52 | struct tcp_sock *tp = tcp_sk(sk); |
463c84b9 | 53 | const struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
54 | struct tcpdiagmsg *r; |
55 | struct nlmsghdr *nlh; | |
56 | struct tcp_info *info = NULL; | |
57 | struct tcpdiag_meminfo *minfo = NULL; | |
1da177e4 LT |
58 | unsigned char *b = skb->tail; |
59 | ||
60 | nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); | |
61 | nlh->nlmsg_flags = nlmsg_flags; | |
62 | r = NLMSG_DATA(nlh); | |
63 | if (sk->sk_state != TCP_TIME_WAIT) { | |
64 | if (ext & (1<<(TCPDIAG_MEMINFO-1))) | |
65 | minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo)); | |
66 | if (ext & (1<<(TCPDIAG_INFO-1))) | |
67 | info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info)); | |
68 | ||
6687e988 ACM |
69 | if ((ext & (1 << (TCPDIAG_CONG - 1))) && icsk->icsk_ca_ops) { |
70 | size_t len = strlen(icsk->icsk_ca_ops->name); | |
056ede6c | 71 | strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1), |
6687e988 | 72 | icsk->icsk_ca_ops->name); |
056ede6c | 73 | } |
1da177e4 LT |
74 | } |
75 | r->tcpdiag_family = sk->sk_family; | |
76 | r->tcpdiag_state = sk->sk_state; | |
77 | r->tcpdiag_timer = 0; | |
78 | r->tcpdiag_retrans = 0; | |
79 | ||
80 | r->id.tcpdiag_if = sk->sk_bound_dev_if; | |
81 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk; | |
82 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); | |
83 | ||
84 | if (r->tcpdiag_state == TCP_TIME_WAIT) { | |
8feaf0c0 | 85 | const struct inet_timewait_sock *tw = inet_twsk(sk); |
1da177e4 LT |
86 | long tmo = tw->tw_ttd - jiffies; |
87 | if (tmo < 0) | |
88 | tmo = 0; | |
89 | ||
90 | r->id.tcpdiag_sport = tw->tw_sport; | |
91 | r->id.tcpdiag_dport = tw->tw_dport; | |
92 | r->id.tcpdiag_src[0] = tw->tw_rcv_saddr; | |
93 | r->id.tcpdiag_dst[0] = tw->tw_daddr; | |
94 | r->tcpdiag_state = tw->tw_substate; | |
95 | r->tcpdiag_timer = 3; | |
96 | r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ; | |
97 | r->tcpdiag_rqueue = 0; | |
98 | r->tcpdiag_wqueue = 0; | |
99 | r->tcpdiag_uid = 0; | |
100 | r->tcpdiag_inode = 0; | |
101 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
102 | if (r->tcpdiag_family == AF_INET6) { | |
8feaf0c0 ACM |
103 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk); |
104 | ||
1da177e4 | 105 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, |
8feaf0c0 | 106 | &tcp6tw->tw_v6_rcv_saddr); |
1da177e4 | 107 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, |
8feaf0c0 | 108 | &tcp6tw->tw_v6_daddr); |
1da177e4 LT |
109 | } |
110 | #endif | |
111 | nlh->nlmsg_len = skb->tail - b; | |
112 | return skb->len; | |
113 | } | |
114 | ||
115 | r->id.tcpdiag_sport = inet->sport; | |
116 | r->id.tcpdiag_dport = inet->dport; | |
117 | r->id.tcpdiag_src[0] = inet->rcv_saddr; | |
118 | r->id.tcpdiag_dst[0] = inet->daddr; | |
119 | ||
120 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
121 | if (r->tcpdiag_family == AF_INET6) { | |
122 | struct ipv6_pinfo *np = inet6_sk(sk); | |
123 | ||
124 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
125 | &np->rcv_saddr); | |
126 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, | |
127 | &np->daddr); | |
128 | } | |
129 | #endif | |
130 | ||
131 | #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ | |
132 | ||
463c84b9 | 133 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
1da177e4 | 134 | r->tcpdiag_timer = 1; |
463c84b9 ACM |
135 | r->tcpdiag_retrans = icsk->icsk_retransmits; |
136 | r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); | |
137 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 138 | r->tcpdiag_timer = 4; |
6687e988 | 139 | r->tcpdiag_retrans = icsk->icsk_probes_out; |
463c84b9 | 140 | r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); |
1da177e4 LT |
141 | } else if (timer_pending(&sk->sk_timer)) { |
142 | r->tcpdiag_timer = 2; | |
6687e988 | 143 | r->tcpdiag_retrans = icsk->icsk_probes_out; |
1da177e4 LT |
144 | r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); |
145 | } else { | |
146 | r->tcpdiag_timer = 0; | |
147 | r->tcpdiag_expires = 0; | |
148 | } | |
149 | #undef EXPIRES_IN_MS | |
1da177e4 LT |
150 | r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq; |
151 | r->tcpdiag_wqueue = tp->write_seq - tp->snd_una; | |
152 | r->tcpdiag_uid = sock_i_uid(sk); | |
153 | r->tcpdiag_inode = sock_i_ino(sk); | |
154 | ||
155 | if (minfo) { | |
156 | minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc); | |
157 | minfo->tcpdiag_wmem = sk->sk_wmem_queued; | |
158 | minfo->tcpdiag_fmem = sk->sk_forward_alloc; | |
159 | minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc); | |
160 | } | |
161 | ||
162 | if (info) | |
163 | tcp_get_info(sk, info); | |
164 | ||
6687e988 ACM |
165 | if (sk->sk_state < TCP_TIME_WAIT && |
166 | icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) | |
167 | icsk->icsk_ca_ops->get_info(sk, ext, skb); | |
1da177e4 LT |
168 | |
169 | nlh->nlmsg_len = skb->tail - b; | |
170 | return skb->len; | |
171 | ||
7c99c909 | 172 | rtattr_failure: |
1da177e4 LT |
173 | nlmsg_failure: |
174 | skb_trim(skb, b - skb->data); | |
175 | return -1; | |
176 | } | |
177 | ||
1da177e4 LT |
178 | #ifdef CONFIG_IP_TCPDIAG_IPV6 |
179 | extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
180 | struct in6_addr *daddr, u16 dport, | |
181 | int dif); | |
182 | #else | |
183 | static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
184 | struct in6_addr *daddr, u16 dport, | |
185 | int dif) | |
186 | { | |
187 | return NULL; | |
188 | } | |
189 | #endif | |
190 | ||
191 | static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) | |
192 | { | |
193 | int err; | |
194 | struct sock *sk; | |
195 | struct tcpdiagreq *req = NLMSG_DATA(nlh); | |
196 | struct sk_buff *rep; | |
197 | ||
198 | if (req->tcpdiag_family == AF_INET) { | |
e48c414e ACM |
199 | sk = inet_lookup(&tcp_hashinfo, req->id.tcpdiag_dst[0], |
200 | req->id.tcpdiag_dport, req->id.tcpdiag_src[0], | |
201 | req->id.tcpdiag_sport, req->id.tcpdiag_if); | |
1da177e4 LT |
202 | } |
203 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
204 | else if (req->tcpdiag_family == AF_INET6) { | |
205 | sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport, | |
206 | (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport, | |
207 | req->id.tcpdiag_if); | |
208 | } | |
209 | #endif | |
210 | else { | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | if (sk == NULL) | |
215 | return -ENOENT; | |
216 | ||
217 | err = -ESTALE; | |
218 | if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE || | |
219 | req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) && | |
220 | ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] || | |
221 | (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1])) | |
222 | goto out; | |
223 | ||
224 | err = -ENOMEM; | |
225 | rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+ | |
226 | sizeof(struct tcpdiag_meminfo)+ | |
227 | sizeof(struct tcp_info)+64), GFP_KERNEL); | |
228 | if (!rep) | |
229 | goto out; | |
230 | ||
231 | if (tcpdiag_fill(rep, sk, req->tcpdiag_ext, | |
232 | NETLINK_CB(in_skb).pid, | |
233 | nlh->nlmsg_seq, 0) <= 0) | |
234 | BUG(); | |
235 | ||
236 | err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
237 | if (err > 0) | |
238 | err = 0; | |
239 | ||
240 | out: | |
241 | if (sk) { | |
242 | if (sk->sk_state == TCP_TIME_WAIT) | |
8feaf0c0 | 243 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
244 | else |
245 | sock_put(sk); | |
246 | } | |
247 | return err; | |
248 | } | |
249 | ||
250 | static int bitstring_match(const u32 *a1, const u32 *a2, int bits) | |
251 | { | |
252 | int words = bits >> 5; | |
253 | ||
254 | bits &= 0x1f; | |
255 | ||
256 | if (words) { | |
257 | if (memcmp(a1, a2, words << 2)) | |
258 | return 0; | |
259 | } | |
260 | if (bits) { | |
261 | __u32 w1, w2; | |
262 | __u32 mask; | |
263 | ||
264 | w1 = a1[words]; | |
265 | w2 = a2[words]; | |
266 | ||
267 | mask = htonl((0xffffffff) << (32 - bits)); | |
268 | ||
269 | if ((w1 ^ w2) & mask) | |
270 | return 0; | |
271 | } | |
272 | ||
273 | return 1; | |
274 | } | |
275 | ||
276 | ||
277 | static int tcpdiag_bc_run(const void *bc, int len, | |
278 | const struct tcpdiag_entry *entry) | |
279 | { | |
280 | while (len > 0) { | |
281 | int yes = 1; | |
282 | const struct tcpdiag_bc_op *op = bc; | |
283 | ||
284 | switch (op->code) { | |
285 | case TCPDIAG_BC_NOP: | |
286 | break; | |
287 | case TCPDIAG_BC_JMP: | |
288 | yes = 0; | |
289 | break; | |
290 | case TCPDIAG_BC_S_GE: | |
291 | yes = entry->sport >= op[1].no; | |
292 | break; | |
293 | case TCPDIAG_BC_S_LE: | |
294 | yes = entry->dport <= op[1].no; | |
295 | break; | |
296 | case TCPDIAG_BC_D_GE: | |
297 | yes = entry->dport >= op[1].no; | |
298 | break; | |
299 | case TCPDIAG_BC_D_LE: | |
300 | yes = entry->dport <= op[1].no; | |
301 | break; | |
302 | case TCPDIAG_BC_AUTO: | |
303 | yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); | |
304 | break; | |
305 | case TCPDIAG_BC_S_COND: | |
306 | case TCPDIAG_BC_D_COND: | |
307 | { | |
308 | struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1); | |
309 | u32 *addr; | |
310 | ||
311 | if (cond->port != -1 && | |
312 | cond->port != (op->code == TCPDIAG_BC_S_COND ? | |
313 | entry->sport : entry->dport)) { | |
314 | yes = 0; | |
315 | break; | |
316 | } | |
317 | ||
318 | if (cond->prefix_len == 0) | |
319 | break; | |
320 | ||
321 | if (op->code == TCPDIAG_BC_S_COND) | |
322 | addr = entry->saddr; | |
323 | else | |
324 | addr = entry->daddr; | |
325 | ||
326 | if (bitstring_match(addr, cond->addr, cond->prefix_len)) | |
327 | break; | |
328 | if (entry->family == AF_INET6 && | |
329 | cond->family == AF_INET) { | |
330 | if (addr[0] == 0 && addr[1] == 0 && | |
331 | addr[2] == htonl(0xffff) && | |
332 | bitstring_match(addr+3, cond->addr, cond->prefix_len)) | |
333 | break; | |
334 | } | |
335 | yes = 0; | |
336 | break; | |
337 | } | |
338 | } | |
339 | ||
340 | if (yes) { | |
341 | len -= op->yes; | |
342 | bc += op->yes; | |
343 | } else { | |
344 | len -= op->no; | |
345 | bc += op->no; | |
346 | } | |
347 | } | |
348 | return (len == 0); | |
349 | } | |
350 | ||
351 | static int valid_cc(const void *bc, int len, int cc) | |
352 | { | |
353 | while (len >= 0) { | |
354 | const struct tcpdiag_bc_op *op = bc; | |
355 | ||
356 | if (cc > len) | |
357 | return 0; | |
358 | if (cc == len) | |
359 | return 1; | |
360 | if (op->yes < 4) | |
361 | return 0; | |
362 | len -= op->yes; | |
363 | bc += op->yes; | |
364 | } | |
365 | return 0; | |
366 | } | |
367 | ||
368 | static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len) | |
369 | { | |
370 | const unsigned char *bc = bytecode; | |
371 | int len = bytecode_len; | |
372 | ||
373 | while (len > 0) { | |
374 | struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc; | |
375 | ||
376 | //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); | |
377 | switch (op->code) { | |
378 | case TCPDIAG_BC_AUTO: | |
379 | case TCPDIAG_BC_S_COND: | |
380 | case TCPDIAG_BC_D_COND: | |
381 | case TCPDIAG_BC_S_GE: | |
382 | case TCPDIAG_BC_S_LE: | |
383 | case TCPDIAG_BC_D_GE: | |
384 | case TCPDIAG_BC_D_LE: | |
385 | if (op->yes < 4 || op->yes > len+4) | |
386 | return -EINVAL; | |
387 | case TCPDIAG_BC_JMP: | |
388 | if (op->no < 4 || op->no > len+4) | |
389 | return -EINVAL; | |
390 | if (op->no < len && | |
391 | !valid_cc(bytecode, bytecode_len, len-op->no)) | |
392 | return -EINVAL; | |
393 | break; | |
394 | case TCPDIAG_BC_NOP: | |
395 | if (op->yes < 4 || op->yes > len+4) | |
396 | return -EINVAL; | |
397 | break; | |
398 | default: | |
399 | return -EINVAL; | |
400 | } | |
401 | bc += op->yes; | |
402 | len -= op->yes; | |
403 | } | |
404 | return len == 0 ? 0 : -EINVAL; | |
405 | } | |
406 | ||
407 | static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk, | |
408 | struct netlink_callback *cb) | |
409 | { | |
410 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
411 | ||
412 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
413 | struct tcpdiag_entry entry; | |
414 | struct rtattr *bc = (struct rtattr *)(r + 1); | |
415 | struct inet_sock *inet = inet_sk(sk); | |
416 | ||
417 | entry.family = sk->sk_family; | |
418 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
419 | if (entry.family == AF_INET6) { | |
420 | struct ipv6_pinfo *np = inet6_sk(sk); | |
421 | ||
422 | entry.saddr = np->rcv_saddr.s6_addr32; | |
423 | entry.daddr = np->daddr.s6_addr32; | |
424 | } else | |
425 | #endif | |
426 | { | |
427 | entry.saddr = &inet->rcv_saddr; | |
428 | entry.daddr = &inet->daddr; | |
429 | } | |
430 | entry.sport = inet->num; | |
431 | entry.dport = ntohs(inet->dport); | |
432 | entry.userlocks = sk->sk_userlocks; | |
433 | ||
434 | if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) | |
435 | return 0; | |
436 | } | |
437 | ||
438 | return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid, | |
439 | cb->nlh->nlmsg_seq, NLM_F_MULTI); | |
440 | } | |
441 | ||
442 | static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk, | |
60236fdd | 443 | struct request_sock *req, |
1da177e4 LT |
444 | u32 pid, u32 seq) |
445 | { | |
2e6599cb | 446 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
447 | struct inet_sock *inet = inet_sk(sk); |
448 | unsigned char *b = skb->tail; | |
449 | struct tcpdiagmsg *r; | |
450 | struct nlmsghdr *nlh; | |
451 | long tmo; | |
452 | ||
453 | nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); | |
454 | nlh->nlmsg_flags = NLM_F_MULTI; | |
455 | r = NLMSG_DATA(nlh); | |
456 | ||
457 | r->tcpdiag_family = sk->sk_family; | |
458 | r->tcpdiag_state = TCP_SYN_RECV; | |
459 | r->tcpdiag_timer = 1; | |
460 | r->tcpdiag_retrans = req->retrans; | |
461 | ||
462 | r->id.tcpdiag_if = sk->sk_bound_dev_if; | |
463 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req; | |
464 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); | |
465 | ||
466 | tmo = req->expires - jiffies; | |
467 | if (tmo < 0) | |
468 | tmo = 0; | |
469 | ||
470 | r->id.tcpdiag_sport = inet->sport; | |
2e6599cb ACM |
471 | r->id.tcpdiag_dport = ireq->rmt_port; |
472 | r->id.tcpdiag_src[0] = ireq->loc_addr; | |
473 | r->id.tcpdiag_dst[0] = ireq->rmt_addr; | |
1da177e4 LT |
474 | r->tcpdiag_expires = jiffies_to_msecs(tmo), |
475 | r->tcpdiag_rqueue = 0; | |
476 | r->tcpdiag_wqueue = 0; | |
477 | r->tcpdiag_uid = sock_i_uid(sk); | |
478 | r->tcpdiag_inode = 0; | |
479 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
480 | if (r->tcpdiag_family == AF_INET6) { | |
481 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
2e6599cb | 482 | &tcp6_rsk(req)->loc_addr); |
1da177e4 | 483 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, |
2e6599cb | 484 | &tcp6_rsk(req)->rmt_addr); |
1da177e4 LT |
485 | } |
486 | #endif | |
487 | nlh->nlmsg_len = skb->tail - b; | |
488 | ||
489 | return skb->len; | |
490 | ||
491 | nlmsg_failure: | |
492 | skb_trim(skb, b - skb->data); | |
493 | return -1; | |
494 | } | |
495 | ||
496 | static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk, | |
497 | struct netlink_callback *cb) | |
498 | { | |
499 | struct tcpdiag_entry entry; | |
500 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
463c84b9 | 501 | struct inet_connection_sock *icsk = inet_csk(sk); |
2ad69c55 | 502 | struct listen_sock *lopt; |
1da177e4 LT |
503 | struct rtattr *bc = NULL; |
504 | struct inet_sock *inet = inet_sk(sk); | |
505 | int j, s_j; | |
506 | int reqnum, s_reqnum; | |
507 | int err = 0; | |
508 | ||
509 | s_j = cb->args[3]; | |
510 | s_reqnum = cb->args[4]; | |
511 | ||
512 | if (s_j > 0) | |
513 | s_j--; | |
514 | ||
515 | entry.family = sk->sk_family; | |
516 | ||
463c84b9 | 517 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 518 | |
463c84b9 | 519 | lopt = icsk->icsk_accept_queue.listen_opt; |
1da177e4 LT |
520 | if (!lopt || !lopt->qlen) |
521 | goto out; | |
522 | ||
523 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
524 | bc = (struct rtattr *)(r + 1); | |
525 | entry.sport = inet->num; | |
526 | entry.userlocks = sk->sk_userlocks; | |
527 | } | |
528 | ||
529 | for (j = s_j; j < TCP_SYNQ_HSIZE; j++) { | |
60236fdd | 530 | struct request_sock *req, *head = lopt->syn_table[j]; |
1da177e4 LT |
531 | |
532 | reqnum = 0; | |
533 | for (req = head; req; reqnum++, req = req->dl_next) { | |
2e6599cb ACM |
534 | struct inet_request_sock *ireq = inet_rsk(req); |
535 | ||
1da177e4 LT |
536 | if (reqnum < s_reqnum) |
537 | continue; | |
2e6599cb | 538 | if (r->id.tcpdiag_dport != ireq->rmt_port && |
1da177e4 LT |
539 | r->id.tcpdiag_dport) |
540 | continue; | |
541 | ||
542 | if (bc) { | |
543 | entry.saddr = | |
544 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
545 | (entry.family == AF_INET6) ? | |
2e6599cb | 546 | tcp6_rsk(req)->loc_addr.s6_addr32 : |
1da177e4 | 547 | #endif |
2e6599cb | 548 | &ireq->loc_addr; |
1da177e4 LT |
549 | entry.daddr = |
550 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
551 | (entry.family == AF_INET6) ? | |
2e6599cb | 552 | tcp6_rsk(req)->rmt_addr.s6_addr32 : |
1da177e4 | 553 | #endif |
2e6599cb ACM |
554 | &ireq->rmt_addr; |
555 | entry.dport = ntohs(ireq->rmt_port); | |
1da177e4 LT |
556 | |
557 | if (!tcpdiag_bc_run(RTA_DATA(bc), | |
558 | RTA_PAYLOAD(bc), &entry)) | |
559 | continue; | |
560 | } | |
561 | ||
562 | err = tcpdiag_fill_req(skb, sk, req, | |
563 | NETLINK_CB(cb->skb).pid, | |
564 | cb->nlh->nlmsg_seq); | |
565 | if (err < 0) { | |
566 | cb->args[3] = j + 1; | |
567 | cb->args[4] = reqnum; | |
568 | goto out; | |
569 | } | |
570 | } | |
571 | ||
572 | s_reqnum = 0; | |
573 | } | |
574 | ||
575 | out: | |
463c84b9 | 576 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 LT |
577 | |
578 | return err; | |
579 | } | |
580 | ||
581 | static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
582 | { | |
583 | int i, num; | |
584 | int s_i, s_num; | |
585 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
586 | ||
587 | s_i = cb->args[1]; | |
588 | s_num = num = cb->args[2]; | |
589 | ||
590 | if (cb->args[0] == 0) { | |
591 | if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV))) | |
592 | goto skip_listen_ht; | |
f3f05f70 | 593 | inet_listen_lock(&tcp_hashinfo); |
0f7ff927 | 594 | for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
1da177e4 LT |
595 | struct sock *sk; |
596 | struct hlist_node *node; | |
597 | ||
598 | num = 0; | |
6e04e021 | 599 | sk_for_each(sk, node, &tcp_hashinfo.listening_hash[i]) { |
1da177e4 LT |
600 | struct inet_sock *inet = inet_sk(sk); |
601 | ||
602 | if (num < s_num) { | |
603 | num++; | |
604 | continue; | |
605 | } | |
606 | ||
607 | if (r->id.tcpdiag_sport != inet->sport && | |
608 | r->id.tcpdiag_sport) | |
609 | goto next_listen; | |
610 | ||
611 | if (!(r->tcpdiag_states&TCPF_LISTEN) || | |
612 | r->id.tcpdiag_dport || | |
613 | cb->args[3] > 0) | |
614 | goto syn_recv; | |
615 | ||
616 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
f3f05f70 | 617 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
618 | goto done; |
619 | } | |
620 | ||
621 | syn_recv: | |
622 | if (!(r->tcpdiag_states&TCPF_SYN_RECV)) | |
623 | goto next_listen; | |
624 | ||
625 | if (tcpdiag_dump_reqs(skb, sk, cb) < 0) { | |
f3f05f70 | 626 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
627 | goto done; |
628 | } | |
629 | ||
630 | next_listen: | |
631 | cb->args[3] = 0; | |
632 | cb->args[4] = 0; | |
633 | ++num; | |
634 | } | |
635 | ||
636 | s_num = 0; | |
637 | cb->args[3] = 0; | |
638 | cb->args[4] = 0; | |
639 | } | |
f3f05f70 | 640 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
641 | skip_listen_ht: |
642 | cb->args[0] = 1; | |
643 | s_i = num = s_num = 0; | |
644 | } | |
645 | ||
646 | if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV))) | |
647 | return skb->len; | |
648 | ||
6e04e021 ACM |
649 | for (i = s_i; i < tcp_hashinfo.ehash_size; i++) { |
650 | struct inet_ehash_bucket *head = &tcp_hashinfo.ehash[i]; | |
1da177e4 LT |
651 | struct sock *sk; |
652 | struct hlist_node *node; | |
653 | ||
654 | if (i > s_i) | |
655 | s_num = 0; | |
656 | ||
657 | read_lock_bh(&head->lock); | |
658 | ||
659 | num = 0; | |
660 | sk_for_each(sk, node, &head->chain) { | |
661 | struct inet_sock *inet = inet_sk(sk); | |
662 | ||
663 | if (num < s_num) | |
664 | goto next_normal; | |
665 | if (!(r->tcpdiag_states & (1 << sk->sk_state))) | |
666 | goto next_normal; | |
667 | if (r->id.tcpdiag_sport != inet->sport && | |
668 | r->id.tcpdiag_sport) | |
669 | goto next_normal; | |
670 | if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport) | |
671 | goto next_normal; | |
672 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
673 | read_unlock_bh(&head->lock); | |
674 | goto done; | |
675 | } | |
676 | next_normal: | |
677 | ++num; | |
678 | } | |
679 | ||
680 | if (r->tcpdiag_states&TCPF_TIME_WAIT) { | |
681 | sk_for_each(sk, node, | |
6e04e021 | 682 | &tcp_hashinfo.ehash[i + tcp_hashinfo.ehash_size].chain) { |
1da177e4 LT |
683 | struct inet_sock *inet = inet_sk(sk); |
684 | ||
685 | if (num < s_num) | |
686 | goto next_dying; | |
687 | if (r->id.tcpdiag_sport != inet->sport && | |
688 | r->id.tcpdiag_sport) | |
689 | goto next_dying; | |
690 | if (r->id.tcpdiag_dport != inet->dport && | |
691 | r->id.tcpdiag_dport) | |
692 | goto next_dying; | |
693 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
694 | read_unlock_bh(&head->lock); | |
695 | goto done; | |
696 | } | |
697 | next_dying: | |
698 | ++num; | |
699 | } | |
700 | } | |
701 | read_unlock_bh(&head->lock); | |
702 | } | |
703 | ||
704 | done: | |
705 | cb->args[1] = i; | |
706 | cb->args[2] = num; | |
707 | return skb->len; | |
708 | } | |
709 | ||
710 | static int tcpdiag_dump_done(struct netlink_callback *cb) | |
711 | { | |
712 | return 0; | |
713 | } | |
714 | ||
715 | ||
716 | static __inline__ int | |
717 | tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
718 | { | |
719 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
720 | return 0; | |
721 | ||
722 | if (nlh->nlmsg_type != TCPDIAG_GETSOCK) | |
723 | goto err_inval; | |
724 | ||
725 | if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len) | |
726 | goto err_inval; | |
727 | ||
728 | if (nlh->nlmsg_flags&NLM_F_DUMP) { | |
729 | if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) { | |
730 | struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq)); | |
731 | if (rta->rta_type != TCPDIAG_REQ_BYTECODE || | |
732 | rta->rta_len < 8 || | |
733 | rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq))) | |
734 | goto err_inval; | |
735 | if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) | |
736 | goto err_inval; | |
737 | } | |
738 | return netlink_dump_start(tcpnl, skb, nlh, | |
739 | tcpdiag_dump, | |
740 | tcpdiag_dump_done); | |
741 | } else { | |
742 | return tcpdiag_get_exact(skb, nlh); | |
743 | } | |
744 | ||
745 | err_inval: | |
746 | return -EINVAL; | |
747 | } | |
748 | ||
749 | ||
750 | static inline void tcpdiag_rcv_skb(struct sk_buff *skb) | |
751 | { | |
752 | int err; | |
753 | struct nlmsghdr * nlh; | |
754 | ||
755 | if (skb->len >= NLMSG_SPACE(0)) { | |
756 | nlh = (struct nlmsghdr *)skb->data; | |
757 | if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) | |
758 | return; | |
759 | err = tcpdiag_rcv_msg(skb, nlh); | |
760 | if (err || nlh->nlmsg_flags & NLM_F_ACK) | |
761 | netlink_ack(skb, nlh, err); | |
762 | } | |
763 | } | |
764 | ||
765 | static void tcpdiag_rcv(struct sock *sk, int len) | |
766 | { | |
767 | struct sk_buff *skb; | |
2a0a6ebe | 768 | unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); |
1da177e4 | 769 | |
2a0a6ebe | 770 | while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) { |
1da177e4 LT |
771 | tcpdiag_rcv_skb(skb); |
772 | kfree_skb(skb); | |
773 | } | |
774 | } | |
775 | ||
776 | static int __init tcpdiag_init(void) | |
777 | { | |
4fdb3bb7 HW |
778 | tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv, |
779 | THIS_MODULE); | |
1da177e4 LT |
780 | if (tcpnl == NULL) |
781 | return -ENOMEM; | |
782 | return 0; | |
783 | } | |
784 | ||
785 | static void __exit tcpdiag_exit(void) | |
786 | { | |
787 | sock_release(tcpnl->sk_socket); | |
788 | } | |
789 | ||
790 | module_init(tcpdiag_init); | |
791 | module_exit(tcpdiag_exit); | |
792 | MODULE_LICENSE("GPL"); |