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> | |
505cbfc5 ACM |
27 | #include <net/inet_connection_sock.h> |
28 | #include <net/inet_hashtables.h> | |
29 | #include <net/inet_timewait_sock.h> | |
30 | #include <net/inet6_hashtables.h> | |
1da177e4 LT |
31 | |
32 | #include <linux/inet.h> | |
33 | #include <linux/stddef.h> | |
34 | ||
35 | #include <linux/tcp_diag.h> | |
36 | ||
4f5736c4 ACM |
37 | static const struct inet_diag_handler **inet_diag_table; |
38 | ||
1da177e4 LT |
39 | struct tcpdiag_entry |
40 | { | |
41 | u32 *saddr; | |
42 | u32 *daddr; | |
43 | u16 sport; | |
44 | u16 dport; | |
45 | u16 family; | |
46 | u16 userlocks; | |
47 | }; | |
48 | ||
49 | static struct sock *tcpnl; | |
50 | ||
1da177e4 | 51 | #define TCPDIAG_PUT(skb, attrtype, attrlen) \ |
7c99c909 | 52 | RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) |
1da177e4 | 53 | |
e41aac41 | 54 | #ifdef CONFIG_IP_TCPDIAG_DCCP |
540722ff ACM |
55 | extern struct inet_hashinfo dccp_hashinfo; |
56 | #endif | |
57 | ||
1da177e4 | 58 | static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk, |
540722ff ACM |
59 | int ext, u32 pid, u32 seq, u16 nlmsg_flags, |
60 | const struct nlmsghdr *unlh) | |
1da177e4 | 61 | { |
463c84b9 | 62 | const struct inet_sock *inet = inet_sk(sk); |
463c84b9 | 63 | const struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
64 | struct tcpdiagmsg *r; |
65 | struct nlmsghdr *nlh; | |
4f5736c4 | 66 | void *info = NULL; |
1da177e4 | 67 | struct tcpdiag_meminfo *minfo = NULL; |
1da177e4 | 68 | unsigned char *b = skb->tail; |
4f5736c4 ACM |
69 | const struct inet_diag_handler *handler; |
70 | ||
71 | handler = inet_diag_table[unlh->nlmsg_type]; | |
72 | BUG_ON(handler == NULL); | |
1da177e4 | 73 | |
540722ff | 74 | nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); |
1da177e4 | 75 | nlh->nlmsg_flags = nlmsg_flags; |
4f5736c4 | 76 | |
1da177e4 LT |
77 | r = NLMSG_DATA(nlh); |
78 | if (sk->sk_state != TCP_TIME_WAIT) { | |
79 | if (ext & (1<<(TCPDIAG_MEMINFO-1))) | |
80 | minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo)); | |
81 | if (ext & (1<<(TCPDIAG_INFO-1))) | |
4f5736c4 ACM |
82 | info = TCPDIAG_PUT(skb, TCPDIAG_INFO, |
83 | handler->idiag_info_size); | |
1da177e4 | 84 | |
6687e988 ACM |
85 | if ((ext & (1 << (TCPDIAG_CONG - 1))) && icsk->icsk_ca_ops) { |
86 | size_t len = strlen(icsk->icsk_ca_ops->name); | |
056ede6c | 87 | strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1), |
6687e988 | 88 | icsk->icsk_ca_ops->name); |
056ede6c | 89 | } |
1da177e4 LT |
90 | } |
91 | r->tcpdiag_family = sk->sk_family; | |
92 | r->tcpdiag_state = sk->sk_state; | |
93 | r->tcpdiag_timer = 0; | |
94 | r->tcpdiag_retrans = 0; | |
95 | ||
96 | r->id.tcpdiag_if = sk->sk_bound_dev_if; | |
97 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk; | |
98 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); | |
99 | ||
100 | if (r->tcpdiag_state == TCP_TIME_WAIT) { | |
8feaf0c0 | 101 | const struct inet_timewait_sock *tw = inet_twsk(sk); |
1da177e4 LT |
102 | long tmo = tw->tw_ttd - jiffies; |
103 | if (tmo < 0) | |
104 | tmo = 0; | |
105 | ||
106 | r->id.tcpdiag_sport = tw->tw_sport; | |
107 | r->id.tcpdiag_dport = tw->tw_dport; | |
108 | r->id.tcpdiag_src[0] = tw->tw_rcv_saddr; | |
109 | r->id.tcpdiag_dst[0] = tw->tw_daddr; | |
110 | r->tcpdiag_state = tw->tw_substate; | |
111 | r->tcpdiag_timer = 3; | |
112 | r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ; | |
113 | r->tcpdiag_rqueue = 0; | |
114 | r->tcpdiag_wqueue = 0; | |
115 | r->tcpdiag_uid = 0; | |
116 | r->tcpdiag_inode = 0; | |
505cbfc5 | 117 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 | 118 | if (r->tcpdiag_family == AF_INET6) { |
8feaf0c0 ACM |
119 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk); |
120 | ||
1da177e4 | 121 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, |
8feaf0c0 | 122 | &tcp6tw->tw_v6_rcv_saddr); |
1da177e4 | 123 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, |
8feaf0c0 | 124 | &tcp6tw->tw_v6_daddr); |
1da177e4 LT |
125 | } |
126 | #endif | |
127 | nlh->nlmsg_len = skb->tail - b; | |
128 | return skb->len; | |
129 | } | |
130 | ||
131 | r->id.tcpdiag_sport = inet->sport; | |
132 | r->id.tcpdiag_dport = inet->dport; | |
133 | r->id.tcpdiag_src[0] = inet->rcv_saddr; | |
134 | r->id.tcpdiag_dst[0] = inet->daddr; | |
135 | ||
505cbfc5 | 136 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 LT |
137 | if (r->tcpdiag_family == AF_INET6) { |
138 | struct ipv6_pinfo *np = inet6_sk(sk); | |
139 | ||
140 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
141 | &np->rcv_saddr); | |
142 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, | |
143 | &np->daddr); | |
144 | } | |
145 | #endif | |
146 | ||
147 | #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ | |
148 | ||
463c84b9 | 149 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
1da177e4 | 150 | r->tcpdiag_timer = 1; |
463c84b9 ACM |
151 | r->tcpdiag_retrans = icsk->icsk_retransmits; |
152 | r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); | |
153 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 154 | r->tcpdiag_timer = 4; |
6687e988 | 155 | r->tcpdiag_retrans = icsk->icsk_probes_out; |
463c84b9 | 156 | r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); |
1da177e4 LT |
157 | } else if (timer_pending(&sk->sk_timer)) { |
158 | r->tcpdiag_timer = 2; | |
6687e988 | 159 | r->tcpdiag_retrans = icsk->icsk_probes_out; |
1da177e4 LT |
160 | r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); |
161 | } else { | |
162 | r->tcpdiag_timer = 0; | |
163 | r->tcpdiag_expires = 0; | |
164 | } | |
165 | #undef EXPIRES_IN_MS | |
540722ff | 166 | |
1da177e4 LT |
167 | r->tcpdiag_uid = sock_i_uid(sk); |
168 | r->tcpdiag_inode = sock_i_ino(sk); | |
169 | ||
170 | if (minfo) { | |
171 | minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc); | |
172 | minfo->tcpdiag_wmem = sk->sk_wmem_queued; | |
173 | minfo->tcpdiag_fmem = sk->sk_forward_alloc; | |
174 | minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc); | |
175 | } | |
176 | ||
4f5736c4 | 177 | handler->idiag_get_info(sk, r, info); |
1da177e4 | 178 | |
6687e988 ACM |
179 | if (sk->sk_state < TCP_TIME_WAIT && |
180 | icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) | |
181 | icsk->icsk_ca_ops->get_info(sk, ext, skb); | |
1da177e4 LT |
182 | |
183 | nlh->nlmsg_len = skb->tail - b; | |
184 | return skb->len; | |
185 | ||
7c99c909 | 186 | rtattr_failure: |
1da177e4 LT |
187 | nlmsg_failure: |
188 | skb_trim(skb, b - skb->data); | |
189 | return -1; | |
190 | } | |
191 | ||
1da177e4 LT |
192 | static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) |
193 | { | |
194 | int err; | |
195 | struct sock *sk; | |
196 | struct tcpdiagreq *req = NLMSG_DATA(nlh); | |
197 | struct sk_buff *rep; | |
4f5736c4 ACM |
198 | struct inet_hashinfo *hashinfo; |
199 | const struct inet_diag_handler *handler; | |
200 | ||
201 | handler = inet_diag_table[nlh->nlmsg_type]; | |
202 | BUG_ON(handler == NULL); | |
203 | hashinfo = handler->idiag_hashinfo; | |
204 | ||
1da177e4 | 205 | if (req->tcpdiag_family == AF_INET) { |
540722ff | 206 | sk = inet_lookup(hashinfo, req->id.tcpdiag_dst[0], |
e48c414e ACM |
207 | req->id.tcpdiag_dport, req->id.tcpdiag_src[0], |
208 | req->id.tcpdiag_sport, req->id.tcpdiag_if); | |
1da177e4 | 209 | } |
505cbfc5 | 210 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 | 211 | else if (req->tcpdiag_family == AF_INET6) { |
505cbfc5 ACM |
212 | sk = inet6_lookup(hashinfo, |
213 | (struct in6_addr*)req->id.tcpdiag_dst, | |
214 | req->id.tcpdiag_dport, | |
215 | (struct in6_addr*)req->id.tcpdiag_src, | |
216 | req->id.tcpdiag_sport, | |
217 | req->id.tcpdiag_if); | |
1da177e4 LT |
218 | } |
219 | #endif | |
220 | else { | |
221 | return -EINVAL; | |
222 | } | |
223 | ||
224 | if (sk == NULL) | |
225 | return -ENOENT; | |
226 | ||
227 | err = -ESTALE; | |
228 | if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE || | |
229 | req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) && | |
230 | ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] || | |
231 | (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1])) | |
232 | goto out; | |
233 | ||
234 | err = -ENOMEM; | |
4f5736c4 ACM |
235 | rep = alloc_skb(NLMSG_SPACE((sizeof(struct tcpdiagmsg) + |
236 | sizeof(struct tcpdiag_meminfo) + | |
237 | handler->idiag_info_size + 64)), | |
238 | GFP_KERNEL); | |
1da177e4 LT |
239 | if (!rep) |
240 | goto out; | |
241 | ||
242 | if (tcpdiag_fill(rep, sk, req->tcpdiag_ext, | |
243 | NETLINK_CB(in_skb).pid, | |
540722ff | 244 | nlh->nlmsg_seq, 0, nlh) <= 0) |
1da177e4 LT |
245 | BUG(); |
246 | ||
247 | err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
248 | if (err > 0) | |
249 | err = 0; | |
250 | ||
251 | out: | |
252 | if (sk) { | |
253 | if (sk->sk_state == TCP_TIME_WAIT) | |
8feaf0c0 | 254 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
255 | else |
256 | sock_put(sk); | |
257 | } | |
258 | return err; | |
259 | } | |
260 | ||
261 | static int bitstring_match(const u32 *a1, const u32 *a2, int bits) | |
262 | { | |
263 | int words = bits >> 5; | |
264 | ||
265 | bits &= 0x1f; | |
266 | ||
267 | if (words) { | |
268 | if (memcmp(a1, a2, words << 2)) | |
269 | return 0; | |
270 | } | |
271 | if (bits) { | |
272 | __u32 w1, w2; | |
273 | __u32 mask; | |
274 | ||
275 | w1 = a1[words]; | |
276 | w2 = a2[words]; | |
277 | ||
278 | mask = htonl((0xffffffff) << (32 - bits)); | |
279 | ||
280 | if ((w1 ^ w2) & mask) | |
281 | return 0; | |
282 | } | |
283 | ||
284 | return 1; | |
285 | } | |
286 | ||
287 | ||
288 | static int tcpdiag_bc_run(const void *bc, int len, | |
289 | const struct tcpdiag_entry *entry) | |
290 | { | |
291 | while (len > 0) { | |
292 | int yes = 1; | |
293 | const struct tcpdiag_bc_op *op = bc; | |
294 | ||
295 | switch (op->code) { | |
296 | case TCPDIAG_BC_NOP: | |
297 | break; | |
298 | case TCPDIAG_BC_JMP: | |
299 | yes = 0; | |
300 | break; | |
301 | case TCPDIAG_BC_S_GE: | |
302 | yes = entry->sport >= op[1].no; | |
303 | break; | |
304 | case TCPDIAG_BC_S_LE: | |
305 | yes = entry->dport <= op[1].no; | |
306 | break; | |
307 | case TCPDIAG_BC_D_GE: | |
308 | yes = entry->dport >= op[1].no; | |
309 | break; | |
310 | case TCPDIAG_BC_D_LE: | |
311 | yes = entry->dport <= op[1].no; | |
312 | break; | |
313 | case TCPDIAG_BC_AUTO: | |
314 | yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); | |
315 | break; | |
316 | case TCPDIAG_BC_S_COND: | |
317 | case TCPDIAG_BC_D_COND: | |
318 | { | |
319 | struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1); | |
320 | u32 *addr; | |
321 | ||
322 | if (cond->port != -1 && | |
323 | cond->port != (op->code == TCPDIAG_BC_S_COND ? | |
324 | entry->sport : entry->dport)) { | |
325 | yes = 0; | |
326 | break; | |
327 | } | |
328 | ||
329 | if (cond->prefix_len == 0) | |
330 | break; | |
331 | ||
332 | if (op->code == TCPDIAG_BC_S_COND) | |
333 | addr = entry->saddr; | |
334 | else | |
335 | addr = entry->daddr; | |
336 | ||
337 | if (bitstring_match(addr, cond->addr, cond->prefix_len)) | |
338 | break; | |
339 | if (entry->family == AF_INET6 && | |
340 | cond->family == AF_INET) { | |
341 | if (addr[0] == 0 && addr[1] == 0 && | |
342 | addr[2] == htonl(0xffff) && | |
343 | bitstring_match(addr+3, cond->addr, cond->prefix_len)) | |
344 | break; | |
345 | } | |
346 | yes = 0; | |
347 | break; | |
348 | } | |
349 | } | |
350 | ||
351 | if (yes) { | |
352 | len -= op->yes; | |
353 | bc += op->yes; | |
354 | } else { | |
355 | len -= op->no; | |
356 | bc += op->no; | |
357 | } | |
358 | } | |
359 | return (len == 0); | |
360 | } | |
361 | ||
362 | static int valid_cc(const void *bc, int len, int cc) | |
363 | { | |
364 | while (len >= 0) { | |
365 | const struct tcpdiag_bc_op *op = bc; | |
366 | ||
367 | if (cc > len) | |
368 | return 0; | |
369 | if (cc == len) | |
370 | return 1; | |
371 | if (op->yes < 4) | |
372 | return 0; | |
373 | len -= op->yes; | |
374 | bc += op->yes; | |
375 | } | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len) | |
380 | { | |
381 | const unsigned char *bc = bytecode; | |
382 | int len = bytecode_len; | |
383 | ||
384 | while (len > 0) { | |
385 | struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc; | |
386 | ||
387 | //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); | |
388 | switch (op->code) { | |
389 | case TCPDIAG_BC_AUTO: | |
390 | case TCPDIAG_BC_S_COND: | |
391 | case TCPDIAG_BC_D_COND: | |
392 | case TCPDIAG_BC_S_GE: | |
393 | case TCPDIAG_BC_S_LE: | |
394 | case TCPDIAG_BC_D_GE: | |
395 | case TCPDIAG_BC_D_LE: | |
396 | if (op->yes < 4 || op->yes > len+4) | |
397 | return -EINVAL; | |
398 | case TCPDIAG_BC_JMP: | |
399 | if (op->no < 4 || op->no > len+4) | |
400 | return -EINVAL; | |
401 | if (op->no < len && | |
402 | !valid_cc(bytecode, bytecode_len, len-op->no)) | |
403 | return -EINVAL; | |
404 | break; | |
405 | case TCPDIAG_BC_NOP: | |
406 | if (op->yes < 4 || op->yes > len+4) | |
407 | return -EINVAL; | |
408 | break; | |
409 | default: | |
410 | return -EINVAL; | |
411 | } | |
412 | bc += op->yes; | |
413 | len -= op->yes; | |
414 | } | |
415 | return len == 0 ? 0 : -EINVAL; | |
416 | } | |
417 | ||
418 | static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk, | |
419 | struct netlink_callback *cb) | |
420 | { | |
421 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
422 | ||
423 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
424 | struct tcpdiag_entry entry; | |
425 | struct rtattr *bc = (struct rtattr *)(r + 1); | |
426 | struct inet_sock *inet = inet_sk(sk); | |
427 | ||
428 | entry.family = sk->sk_family; | |
505cbfc5 | 429 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 LT |
430 | if (entry.family == AF_INET6) { |
431 | struct ipv6_pinfo *np = inet6_sk(sk); | |
432 | ||
433 | entry.saddr = np->rcv_saddr.s6_addr32; | |
434 | entry.daddr = np->daddr.s6_addr32; | |
435 | } else | |
436 | #endif | |
437 | { | |
438 | entry.saddr = &inet->rcv_saddr; | |
439 | entry.daddr = &inet->daddr; | |
440 | } | |
441 | entry.sport = inet->num; | |
442 | entry.dport = ntohs(inet->dport); | |
443 | entry.userlocks = sk->sk_userlocks; | |
444 | ||
445 | if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) | |
446 | return 0; | |
447 | } | |
448 | ||
449 | return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid, | |
540722ff | 450 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
1da177e4 LT |
451 | } |
452 | ||
453 | static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk, | |
60236fdd | 454 | struct request_sock *req, |
540722ff ACM |
455 | u32 pid, u32 seq, |
456 | const struct nlmsghdr *unlh) | |
1da177e4 | 457 | { |
2e6599cb | 458 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
459 | struct inet_sock *inet = inet_sk(sk); |
460 | unsigned char *b = skb->tail; | |
461 | struct tcpdiagmsg *r; | |
462 | struct nlmsghdr *nlh; | |
463 | long tmo; | |
464 | ||
540722ff | 465 | nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); |
1da177e4 LT |
466 | nlh->nlmsg_flags = NLM_F_MULTI; |
467 | r = NLMSG_DATA(nlh); | |
468 | ||
469 | r->tcpdiag_family = sk->sk_family; | |
470 | r->tcpdiag_state = TCP_SYN_RECV; | |
471 | r->tcpdiag_timer = 1; | |
472 | r->tcpdiag_retrans = req->retrans; | |
473 | ||
474 | r->id.tcpdiag_if = sk->sk_bound_dev_if; | |
475 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req; | |
476 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); | |
477 | ||
478 | tmo = req->expires - jiffies; | |
479 | if (tmo < 0) | |
480 | tmo = 0; | |
481 | ||
482 | r->id.tcpdiag_sport = inet->sport; | |
2e6599cb ACM |
483 | r->id.tcpdiag_dport = ireq->rmt_port; |
484 | r->id.tcpdiag_src[0] = ireq->loc_addr; | |
485 | r->id.tcpdiag_dst[0] = ireq->rmt_addr; | |
1da177e4 LT |
486 | r->tcpdiag_expires = jiffies_to_msecs(tmo), |
487 | r->tcpdiag_rqueue = 0; | |
488 | r->tcpdiag_wqueue = 0; | |
489 | r->tcpdiag_uid = sock_i_uid(sk); | |
490 | r->tcpdiag_inode = 0; | |
505cbfc5 | 491 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 LT |
492 | if (r->tcpdiag_family == AF_INET6) { |
493 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
2e6599cb | 494 | &tcp6_rsk(req)->loc_addr); |
1da177e4 | 495 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, |
2e6599cb | 496 | &tcp6_rsk(req)->rmt_addr); |
1da177e4 LT |
497 | } |
498 | #endif | |
499 | nlh->nlmsg_len = skb->tail - b; | |
500 | ||
501 | return skb->len; | |
502 | ||
503 | nlmsg_failure: | |
504 | skb_trim(skb, b - skb->data); | |
505 | return -1; | |
506 | } | |
507 | ||
508 | static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk, | |
509 | struct netlink_callback *cb) | |
510 | { | |
511 | struct tcpdiag_entry entry; | |
512 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
463c84b9 | 513 | struct inet_connection_sock *icsk = inet_csk(sk); |
2ad69c55 | 514 | struct listen_sock *lopt; |
1da177e4 LT |
515 | struct rtattr *bc = NULL; |
516 | struct inet_sock *inet = inet_sk(sk); | |
517 | int j, s_j; | |
518 | int reqnum, s_reqnum; | |
519 | int err = 0; | |
520 | ||
521 | s_j = cb->args[3]; | |
522 | s_reqnum = cb->args[4]; | |
523 | ||
524 | if (s_j > 0) | |
525 | s_j--; | |
526 | ||
527 | entry.family = sk->sk_family; | |
528 | ||
463c84b9 | 529 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 530 | |
463c84b9 | 531 | lopt = icsk->icsk_accept_queue.listen_opt; |
1da177e4 LT |
532 | if (!lopt || !lopt->qlen) |
533 | goto out; | |
534 | ||
535 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
536 | bc = (struct rtattr *)(r + 1); | |
537 | entry.sport = inet->num; | |
538 | entry.userlocks = sk->sk_userlocks; | |
539 | } | |
540 | ||
540722ff | 541 | for (j = s_j; j < lopt->nr_table_entries; j++) { |
60236fdd | 542 | struct request_sock *req, *head = lopt->syn_table[j]; |
1da177e4 LT |
543 | |
544 | reqnum = 0; | |
545 | for (req = head; req; reqnum++, req = req->dl_next) { | |
2e6599cb ACM |
546 | struct inet_request_sock *ireq = inet_rsk(req); |
547 | ||
1da177e4 LT |
548 | if (reqnum < s_reqnum) |
549 | continue; | |
2e6599cb | 550 | if (r->id.tcpdiag_dport != ireq->rmt_port && |
1da177e4 LT |
551 | r->id.tcpdiag_dport) |
552 | continue; | |
553 | ||
554 | if (bc) { | |
555 | entry.saddr = | |
505cbfc5 | 556 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 | 557 | (entry.family == AF_INET6) ? |
2e6599cb | 558 | tcp6_rsk(req)->loc_addr.s6_addr32 : |
1da177e4 | 559 | #endif |
2e6599cb | 560 | &ireq->loc_addr; |
1da177e4 | 561 | entry.daddr = |
505cbfc5 | 562 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
1da177e4 | 563 | (entry.family == AF_INET6) ? |
2e6599cb | 564 | tcp6_rsk(req)->rmt_addr.s6_addr32 : |
1da177e4 | 565 | #endif |
2e6599cb ACM |
566 | &ireq->rmt_addr; |
567 | entry.dport = ntohs(ireq->rmt_port); | |
1da177e4 LT |
568 | |
569 | if (!tcpdiag_bc_run(RTA_DATA(bc), | |
570 | RTA_PAYLOAD(bc), &entry)) | |
571 | continue; | |
572 | } | |
573 | ||
574 | err = tcpdiag_fill_req(skb, sk, req, | |
575 | NETLINK_CB(cb->skb).pid, | |
540722ff | 576 | cb->nlh->nlmsg_seq, cb->nlh); |
1da177e4 LT |
577 | if (err < 0) { |
578 | cb->args[3] = j + 1; | |
579 | cb->args[4] = reqnum; | |
580 | goto out; | |
581 | } | |
582 | } | |
583 | ||
584 | s_reqnum = 0; | |
585 | } | |
586 | ||
587 | out: | |
463c84b9 | 588 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 LT |
589 | |
590 | return err; | |
591 | } | |
592 | ||
593 | static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
594 | { | |
595 | int i, num; | |
596 | int s_i, s_num; | |
597 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
4f5736c4 | 598 | const struct inet_diag_handler *handler; |
540722ff | 599 | struct inet_hashinfo *hashinfo; |
1da177e4 | 600 | |
4f5736c4 ACM |
601 | handler = inet_diag_table[cb->nlh->nlmsg_type]; |
602 | BUG_ON(handler == NULL); | |
603 | hashinfo = handler->idiag_hashinfo; | |
604 | ||
1da177e4 LT |
605 | s_i = cb->args[1]; |
606 | s_num = num = cb->args[2]; | |
4f5736c4 | 607 | |
1da177e4 LT |
608 | if (cb->args[0] == 0) { |
609 | if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV))) | |
610 | goto skip_listen_ht; | |
540722ff ACM |
611 | |
612 | inet_listen_lock(hashinfo); | |
0f7ff927 | 613 | for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
1da177e4 LT |
614 | struct sock *sk; |
615 | struct hlist_node *node; | |
616 | ||
617 | num = 0; | |
540722ff | 618 | sk_for_each(sk, node, &hashinfo->listening_hash[i]) { |
1da177e4 LT |
619 | struct inet_sock *inet = inet_sk(sk); |
620 | ||
621 | if (num < s_num) { | |
622 | num++; | |
623 | continue; | |
624 | } | |
625 | ||
626 | if (r->id.tcpdiag_sport != inet->sport && | |
627 | r->id.tcpdiag_sport) | |
628 | goto next_listen; | |
629 | ||
630 | if (!(r->tcpdiag_states&TCPF_LISTEN) || | |
631 | r->id.tcpdiag_dport || | |
632 | cb->args[3] > 0) | |
633 | goto syn_recv; | |
634 | ||
635 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
540722ff | 636 | inet_listen_unlock(hashinfo); |
1da177e4 LT |
637 | goto done; |
638 | } | |
639 | ||
640 | syn_recv: | |
641 | if (!(r->tcpdiag_states&TCPF_SYN_RECV)) | |
642 | goto next_listen; | |
643 | ||
644 | if (tcpdiag_dump_reqs(skb, sk, cb) < 0) { | |
540722ff | 645 | inet_listen_unlock(hashinfo); |
1da177e4 LT |
646 | goto done; |
647 | } | |
648 | ||
649 | next_listen: | |
650 | cb->args[3] = 0; | |
651 | cb->args[4] = 0; | |
652 | ++num; | |
653 | } | |
654 | ||
655 | s_num = 0; | |
656 | cb->args[3] = 0; | |
657 | cb->args[4] = 0; | |
658 | } | |
540722ff | 659 | inet_listen_unlock(hashinfo); |
1da177e4 LT |
660 | skip_listen_ht: |
661 | cb->args[0] = 1; | |
662 | s_i = num = s_num = 0; | |
663 | } | |
664 | ||
665 | if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV))) | |
666 | return skb->len; | |
667 | ||
540722ff ACM |
668 | for (i = s_i; i < hashinfo->ehash_size; i++) { |
669 | struct inet_ehash_bucket *head = &hashinfo->ehash[i]; | |
1da177e4 LT |
670 | struct sock *sk; |
671 | struct hlist_node *node; | |
672 | ||
673 | if (i > s_i) | |
674 | s_num = 0; | |
675 | ||
676 | read_lock_bh(&head->lock); | |
677 | ||
678 | num = 0; | |
679 | sk_for_each(sk, node, &head->chain) { | |
680 | struct inet_sock *inet = inet_sk(sk); | |
681 | ||
682 | if (num < s_num) | |
683 | goto next_normal; | |
684 | if (!(r->tcpdiag_states & (1 << sk->sk_state))) | |
685 | goto next_normal; | |
686 | if (r->id.tcpdiag_sport != inet->sport && | |
687 | r->id.tcpdiag_sport) | |
688 | goto next_normal; | |
689 | if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport) | |
690 | goto next_normal; | |
691 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
692 | read_unlock_bh(&head->lock); | |
693 | goto done; | |
694 | } | |
695 | next_normal: | |
696 | ++num; | |
697 | } | |
698 | ||
699 | if (r->tcpdiag_states&TCPF_TIME_WAIT) { | |
700 | sk_for_each(sk, node, | |
540722ff | 701 | &hashinfo->ehash[i + hashinfo->ehash_size].chain) { |
1da177e4 LT |
702 | struct inet_sock *inet = inet_sk(sk); |
703 | ||
704 | if (num < s_num) | |
705 | goto next_dying; | |
706 | if (r->id.tcpdiag_sport != inet->sport && | |
707 | r->id.tcpdiag_sport) | |
708 | goto next_dying; | |
709 | if (r->id.tcpdiag_dport != inet->dport && | |
710 | r->id.tcpdiag_dport) | |
711 | goto next_dying; | |
712 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
713 | read_unlock_bh(&head->lock); | |
714 | goto done; | |
715 | } | |
716 | next_dying: | |
717 | ++num; | |
718 | } | |
719 | } | |
720 | read_unlock_bh(&head->lock); | |
721 | } | |
722 | ||
723 | done: | |
724 | cb->args[1] = i; | |
725 | cb->args[2] = num; | |
726 | return skb->len; | |
727 | } | |
728 | ||
729 | static int tcpdiag_dump_done(struct netlink_callback *cb) | |
730 | { | |
731 | return 0; | |
732 | } | |
733 | ||
734 | ||
735 | static __inline__ int | |
736 | tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
737 | { | |
738 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
739 | return 0; | |
740 | ||
4f5736c4 | 741 | if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX) |
1da177e4 LT |
742 | goto err_inval; |
743 | ||
4f5736c4 ACM |
744 | if (inet_diag_table[nlh->nlmsg_type] == NULL) |
745 | return -ENOENT; | |
746 | ||
1da177e4 LT |
747 | if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len) |
748 | goto err_inval; | |
749 | ||
750 | if (nlh->nlmsg_flags&NLM_F_DUMP) { | |
751 | if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) { | |
752 | struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq)); | |
753 | if (rta->rta_type != TCPDIAG_REQ_BYTECODE || | |
754 | rta->rta_len < 8 || | |
755 | rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq))) | |
756 | goto err_inval; | |
757 | if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) | |
758 | goto err_inval; | |
759 | } | |
760 | return netlink_dump_start(tcpnl, skb, nlh, | |
761 | tcpdiag_dump, | |
762 | tcpdiag_dump_done); | |
763 | } else { | |
764 | return tcpdiag_get_exact(skb, nlh); | |
765 | } | |
766 | ||
767 | err_inval: | |
768 | return -EINVAL; | |
769 | } | |
770 | ||
771 | ||
772 | static inline void tcpdiag_rcv_skb(struct sk_buff *skb) | |
773 | { | |
774 | int err; | |
775 | struct nlmsghdr * nlh; | |
776 | ||
777 | if (skb->len >= NLMSG_SPACE(0)) { | |
778 | nlh = (struct nlmsghdr *)skb->data; | |
779 | if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) | |
780 | return; | |
781 | err = tcpdiag_rcv_msg(skb, nlh); | |
782 | if (err || nlh->nlmsg_flags & NLM_F_ACK) | |
783 | netlink_ack(skb, nlh, err); | |
784 | } | |
785 | } | |
786 | ||
787 | static void tcpdiag_rcv(struct sock *sk, int len) | |
788 | { | |
789 | struct sk_buff *skb; | |
2a0a6ebe | 790 | unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); |
1da177e4 | 791 | |
2a0a6ebe | 792 | while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) { |
1da177e4 LT |
793 | tcpdiag_rcv_skb(skb); |
794 | kfree_skb(skb); | |
795 | } | |
796 | } | |
797 | ||
4f5736c4 ACM |
798 | static void tcp_diag_get_info(struct sock *sk, struct tcpdiagmsg *r, |
799 | void *_info) | |
800 | { | |
801 | const struct tcp_sock *tp = tcp_sk(sk); | |
802 | struct tcp_info *info = _info; | |
803 | ||
804 | r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq; | |
805 | r->tcpdiag_wqueue = tp->write_seq - tp->snd_una; | |
806 | if (info != NULL) | |
807 | tcp_get_info(sk, info); | |
808 | } | |
809 | ||
810 | static struct inet_diag_handler tcp_diag_handler = { | |
811 | .idiag_hashinfo = &tcp_hashinfo, | |
812 | .idiag_get_info = tcp_diag_get_info, | |
813 | .idiag_type = TCPDIAG_GETSOCK, | |
814 | .idiag_info_size = sizeof(struct tcp_info), | |
815 | }; | |
816 | ||
817 | static DEFINE_SPINLOCK(inet_diag_register_lock); | |
818 | ||
819 | int inet_diag_register(const struct inet_diag_handler *h) | |
820 | { | |
821 | const __u16 type = h->idiag_type; | |
822 | int err = -EINVAL; | |
823 | ||
824 | if (type >= INET_DIAG_GETSOCK_MAX) | |
825 | goto out; | |
826 | ||
827 | spin_lock(&inet_diag_register_lock); | |
828 | err = -EEXIST; | |
829 | if (inet_diag_table[type] == NULL) { | |
830 | inet_diag_table[type] = h; | |
831 | err = 0; | |
832 | } | |
833 | spin_unlock(&inet_diag_register_lock); | |
834 | out: | |
835 | return err; | |
836 | } | |
837 | EXPORT_SYMBOL_GPL(inet_diag_register); | |
838 | ||
839 | void inet_diag_unregister(const struct inet_diag_handler *h) | |
840 | { | |
841 | const __u16 type = h->idiag_type; | |
842 | ||
843 | if (type >= INET_DIAG_GETSOCK_MAX) | |
844 | return; | |
845 | ||
846 | spin_lock(&inet_diag_register_lock); | |
847 | inet_diag_table[type] = NULL; | |
848 | spin_unlock(&inet_diag_register_lock); | |
849 | ||
850 | synchronize_rcu(); | |
851 | } | |
852 | EXPORT_SYMBOL_GPL(inet_diag_unregister); | |
853 | ||
1da177e4 LT |
854 | static int __init tcpdiag_init(void) |
855 | { | |
4f5736c4 ACM |
856 | const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * |
857 | sizeof(struct inet_diag_handler *)); | |
858 | int err = -ENOMEM; | |
859 | ||
860 | inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL); | |
861 | if (!inet_diag_table) | |
862 | goto out; | |
863 | ||
864 | memset(inet_diag_table, 0, inet_diag_table_size); | |
865 | ||
4fdb3bb7 HW |
866 | tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv, |
867 | THIS_MODULE); | |
1da177e4 | 868 | if (tcpnl == NULL) |
4f5736c4 ACM |
869 | goto out_free_table; |
870 | ||
871 | err = inet_diag_register(&tcp_diag_handler); | |
872 | if (err) | |
873 | goto out_sock_release; | |
874 | out: | |
875 | return err; | |
876 | out_sock_release: | |
877 | sock_release(tcpnl->sk_socket); | |
878 | out_free_table: | |
879 | kfree(inet_diag_table); | |
880 | goto out; | |
1da177e4 LT |
881 | } |
882 | ||
883 | static void __exit tcpdiag_exit(void) | |
884 | { | |
885 | sock_release(tcpnl->sk_socket); | |
4f5736c4 | 886 | kfree(inet_diag_table); |
1da177e4 LT |
887 | } |
888 | ||
889 | module_init(tcpdiag_init); | |
890 | module_exit(tcpdiag_exit); | |
891 | MODULE_LICENSE("GPL"); |