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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 | ||
45 | ||
46 | #define TCPDIAG_PUT(skb, attrtype, attrlen) \ | |
47 | ({ int rtalen = RTA_LENGTH(attrlen); \ | |
48 | struct rtattr *rta; \ | |
49 | if (skb_tailroom(skb) < RTA_ALIGN(rtalen)) goto nlmsg_failure; \ | |
50 | rta = (void*)__skb_put(skb, RTA_ALIGN(rtalen)); \ | |
51 | rta->rta_type = attrtype; \ | |
52 | rta->rta_len = rtalen; \ | |
53 | RTA_DATA(rta); }) | |
54 | ||
55 | static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk, | |
56 | int ext, u32 pid, u32 seq, u16 nlmsg_flags) | |
57 | { | |
58 | struct inet_sock *inet = inet_sk(sk); | |
59 | struct tcp_sock *tp = tcp_sk(sk); | |
60 | struct tcpdiagmsg *r; | |
61 | struct nlmsghdr *nlh; | |
62 | struct tcp_info *info = NULL; | |
63 | struct tcpdiag_meminfo *minfo = NULL; | |
64 | struct tcpvegas_info *vinfo = NULL; | |
65 | unsigned char *b = skb->tail; | |
66 | ||
67 | nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); | |
68 | nlh->nlmsg_flags = nlmsg_flags; | |
69 | r = NLMSG_DATA(nlh); | |
70 | if (sk->sk_state != TCP_TIME_WAIT) { | |
71 | if (ext & (1<<(TCPDIAG_MEMINFO-1))) | |
72 | minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo)); | |
73 | if (ext & (1<<(TCPDIAG_INFO-1))) | |
74 | info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info)); | |
75 | ||
76 | if ((tcp_is_westwood(tp) || tcp_is_vegas(tp)) | |
77 | && (ext & (1<<(TCPDIAG_VEGASINFO-1)))) | |
78 | vinfo = TCPDIAG_PUT(skb, TCPDIAG_VEGASINFO, sizeof(*vinfo)); | |
79 | } | |
80 | r->tcpdiag_family = sk->sk_family; | |
81 | r->tcpdiag_state = sk->sk_state; | |
82 | r->tcpdiag_timer = 0; | |
83 | r->tcpdiag_retrans = 0; | |
84 | ||
85 | r->id.tcpdiag_if = sk->sk_bound_dev_if; | |
86 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk; | |
87 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); | |
88 | ||
89 | if (r->tcpdiag_state == TCP_TIME_WAIT) { | |
90 | struct tcp_tw_bucket *tw = (struct tcp_tw_bucket*)sk; | |
91 | long tmo = tw->tw_ttd - jiffies; | |
92 | if (tmo < 0) | |
93 | tmo = 0; | |
94 | ||
95 | r->id.tcpdiag_sport = tw->tw_sport; | |
96 | r->id.tcpdiag_dport = tw->tw_dport; | |
97 | r->id.tcpdiag_src[0] = tw->tw_rcv_saddr; | |
98 | r->id.tcpdiag_dst[0] = tw->tw_daddr; | |
99 | r->tcpdiag_state = tw->tw_substate; | |
100 | r->tcpdiag_timer = 3; | |
101 | r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ; | |
102 | r->tcpdiag_rqueue = 0; | |
103 | r->tcpdiag_wqueue = 0; | |
104 | r->tcpdiag_uid = 0; | |
105 | r->tcpdiag_inode = 0; | |
106 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
107 | if (r->tcpdiag_family == AF_INET6) { | |
108 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
109 | &tw->tw_v6_rcv_saddr); | |
110 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, | |
111 | &tw->tw_v6_daddr); | |
112 | } | |
113 | #endif | |
114 | nlh->nlmsg_len = skb->tail - b; | |
115 | return skb->len; | |
116 | } | |
117 | ||
118 | r->id.tcpdiag_sport = inet->sport; | |
119 | r->id.tcpdiag_dport = inet->dport; | |
120 | r->id.tcpdiag_src[0] = inet->rcv_saddr; | |
121 | r->id.tcpdiag_dst[0] = inet->daddr; | |
122 | ||
123 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
124 | if (r->tcpdiag_family == AF_INET6) { | |
125 | struct ipv6_pinfo *np = inet6_sk(sk); | |
126 | ||
127 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
128 | &np->rcv_saddr); | |
129 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, | |
130 | &np->daddr); | |
131 | } | |
132 | #endif | |
133 | ||
134 | #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ | |
135 | ||
136 | if (tp->pending == TCP_TIME_RETRANS) { | |
137 | r->tcpdiag_timer = 1; | |
138 | r->tcpdiag_retrans = tp->retransmits; | |
139 | r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout); | |
140 | } else if (tp->pending == TCP_TIME_PROBE0) { | |
141 | r->tcpdiag_timer = 4; | |
142 | r->tcpdiag_retrans = tp->probes_out; | |
143 | r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout); | |
144 | } else if (timer_pending(&sk->sk_timer)) { | |
145 | r->tcpdiag_timer = 2; | |
146 | r->tcpdiag_retrans = tp->probes_out; | |
147 | r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); | |
148 | } else { | |
149 | r->tcpdiag_timer = 0; | |
150 | r->tcpdiag_expires = 0; | |
151 | } | |
152 | #undef EXPIRES_IN_MS | |
153 | ||
154 | r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq; | |
155 | r->tcpdiag_wqueue = tp->write_seq - tp->snd_una; | |
156 | r->tcpdiag_uid = sock_i_uid(sk); | |
157 | r->tcpdiag_inode = sock_i_ino(sk); | |
158 | ||
159 | if (minfo) { | |
160 | minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc); | |
161 | minfo->tcpdiag_wmem = sk->sk_wmem_queued; | |
162 | minfo->tcpdiag_fmem = sk->sk_forward_alloc; | |
163 | minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc); | |
164 | } | |
165 | ||
166 | if (info) | |
167 | tcp_get_info(sk, info); | |
168 | ||
169 | if (vinfo) { | |
170 | if (tcp_is_vegas(tp)) { | |
171 | vinfo->tcpv_enabled = tp->vegas.doing_vegas_now; | |
172 | vinfo->tcpv_rttcnt = tp->vegas.cntRTT; | |
173 | vinfo->tcpv_rtt = jiffies_to_usecs(tp->vegas.baseRTT); | |
174 | vinfo->tcpv_minrtt = jiffies_to_usecs(tp->vegas.minRTT); | |
175 | } else { | |
176 | vinfo->tcpv_enabled = 0; | |
177 | vinfo->tcpv_rttcnt = 0; | |
178 | vinfo->tcpv_rtt = jiffies_to_usecs(tp->westwood.rtt); | |
179 | vinfo->tcpv_minrtt = jiffies_to_usecs(tp->westwood.rtt_min); | |
180 | } | |
181 | } | |
182 | ||
183 | nlh->nlmsg_len = skb->tail - b; | |
184 | return skb->len; | |
185 | ||
186 | nlmsg_failure: | |
187 | skb_trim(skb, b - skb->data); | |
188 | return -1; | |
189 | } | |
190 | ||
191 | extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport, | |
192 | int dif); | |
193 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
194 | extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
195 | struct in6_addr *daddr, u16 dport, | |
196 | int dif); | |
197 | #else | |
198 | static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
199 | struct in6_addr *daddr, u16 dport, | |
200 | int dif) | |
201 | { | |
202 | return NULL; | |
203 | } | |
204 | #endif | |
205 | ||
206 | static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) | |
207 | { | |
208 | int err; | |
209 | struct sock *sk; | |
210 | struct tcpdiagreq *req = NLMSG_DATA(nlh); | |
211 | struct sk_buff *rep; | |
212 | ||
213 | if (req->tcpdiag_family == AF_INET) { | |
214 | sk = tcp_v4_lookup(req->id.tcpdiag_dst[0], req->id.tcpdiag_dport, | |
215 | req->id.tcpdiag_src[0], req->id.tcpdiag_sport, | |
216 | req->id.tcpdiag_if); | |
217 | } | |
218 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
219 | else if (req->tcpdiag_family == AF_INET6) { | |
220 | sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport, | |
221 | (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport, | |
222 | req->id.tcpdiag_if); | |
223 | } | |
224 | #endif | |
225 | else { | |
226 | return -EINVAL; | |
227 | } | |
228 | ||
229 | if (sk == NULL) | |
230 | return -ENOENT; | |
231 | ||
232 | err = -ESTALE; | |
233 | if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE || | |
234 | req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) && | |
235 | ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] || | |
236 | (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1])) | |
237 | goto out; | |
238 | ||
239 | err = -ENOMEM; | |
240 | rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+ | |
241 | sizeof(struct tcpdiag_meminfo)+ | |
242 | sizeof(struct tcp_info)+64), GFP_KERNEL); | |
243 | if (!rep) | |
244 | goto out; | |
245 | ||
246 | if (tcpdiag_fill(rep, sk, req->tcpdiag_ext, | |
247 | NETLINK_CB(in_skb).pid, | |
248 | nlh->nlmsg_seq, 0) <= 0) | |
249 | BUG(); | |
250 | ||
251 | err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
252 | if (err > 0) | |
253 | err = 0; | |
254 | ||
255 | out: | |
256 | if (sk) { | |
257 | if (sk->sk_state == TCP_TIME_WAIT) | |
258 | tcp_tw_put((struct tcp_tw_bucket*)sk); | |
259 | else | |
260 | sock_put(sk); | |
261 | } | |
262 | return err; | |
263 | } | |
264 | ||
265 | static int bitstring_match(const u32 *a1, const u32 *a2, int bits) | |
266 | { | |
267 | int words = bits >> 5; | |
268 | ||
269 | bits &= 0x1f; | |
270 | ||
271 | if (words) { | |
272 | if (memcmp(a1, a2, words << 2)) | |
273 | return 0; | |
274 | } | |
275 | if (bits) { | |
276 | __u32 w1, w2; | |
277 | __u32 mask; | |
278 | ||
279 | w1 = a1[words]; | |
280 | w2 = a2[words]; | |
281 | ||
282 | mask = htonl((0xffffffff) << (32 - bits)); | |
283 | ||
284 | if ((w1 ^ w2) & mask) | |
285 | return 0; | |
286 | } | |
287 | ||
288 | return 1; | |
289 | } | |
290 | ||
291 | ||
292 | static int tcpdiag_bc_run(const void *bc, int len, | |
293 | const struct tcpdiag_entry *entry) | |
294 | { | |
295 | while (len > 0) { | |
296 | int yes = 1; | |
297 | const struct tcpdiag_bc_op *op = bc; | |
298 | ||
299 | switch (op->code) { | |
300 | case TCPDIAG_BC_NOP: | |
301 | break; | |
302 | case TCPDIAG_BC_JMP: | |
303 | yes = 0; | |
304 | break; | |
305 | case TCPDIAG_BC_S_GE: | |
306 | yes = entry->sport >= op[1].no; | |
307 | break; | |
308 | case TCPDIAG_BC_S_LE: | |
309 | yes = entry->dport <= op[1].no; | |
310 | break; | |
311 | case TCPDIAG_BC_D_GE: | |
312 | yes = entry->dport >= op[1].no; | |
313 | break; | |
314 | case TCPDIAG_BC_D_LE: | |
315 | yes = entry->dport <= op[1].no; | |
316 | break; | |
317 | case TCPDIAG_BC_AUTO: | |
318 | yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); | |
319 | break; | |
320 | case TCPDIAG_BC_S_COND: | |
321 | case TCPDIAG_BC_D_COND: | |
322 | { | |
323 | struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1); | |
324 | u32 *addr; | |
325 | ||
326 | if (cond->port != -1 && | |
327 | cond->port != (op->code == TCPDIAG_BC_S_COND ? | |
328 | entry->sport : entry->dport)) { | |
329 | yes = 0; | |
330 | break; | |
331 | } | |
332 | ||
333 | if (cond->prefix_len == 0) | |
334 | break; | |
335 | ||
336 | if (op->code == TCPDIAG_BC_S_COND) | |
337 | addr = entry->saddr; | |
338 | else | |
339 | addr = entry->daddr; | |
340 | ||
341 | if (bitstring_match(addr, cond->addr, cond->prefix_len)) | |
342 | break; | |
343 | if (entry->family == AF_INET6 && | |
344 | cond->family == AF_INET) { | |
345 | if (addr[0] == 0 && addr[1] == 0 && | |
346 | addr[2] == htonl(0xffff) && | |
347 | bitstring_match(addr+3, cond->addr, cond->prefix_len)) | |
348 | break; | |
349 | } | |
350 | yes = 0; | |
351 | break; | |
352 | } | |
353 | } | |
354 | ||
355 | if (yes) { | |
356 | len -= op->yes; | |
357 | bc += op->yes; | |
358 | } else { | |
359 | len -= op->no; | |
360 | bc += op->no; | |
361 | } | |
362 | } | |
363 | return (len == 0); | |
364 | } | |
365 | ||
366 | static int valid_cc(const void *bc, int len, int cc) | |
367 | { | |
368 | while (len >= 0) { | |
369 | const struct tcpdiag_bc_op *op = bc; | |
370 | ||
371 | if (cc > len) | |
372 | return 0; | |
373 | if (cc == len) | |
374 | return 1; | |
375 | if (op->yes < 4) | |
376 | return 0; | |
377 | len -= op->yes; | |
378 | bc += op->yes; | |
379 | } | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len) | |
384 | { | |
385 | const unsigned char *bc = bytecode; | |
386 | int len = bytecode_len; | |
387 | ||
388 | while (len > 0) { | |
389 | struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc; | |
390 | ||
391 | //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); | |
392 | switch (op->code) { | |
393 | case TCPDIAG_BC_AUTO: | |
394 | case TCPDIAG_BC_S_COND: | |
395 | case TCPDIAG_BC_D_COND: | |
396 | case TCPDIAG_BC_S_GE: | |
397 | case TCPDIAG_BC_S_LE: | |
398 | case TCPDIAG_BC_D_GE: | |
399 | case TCPDIAG_BC_D_LE: | |
400 | if (op->yes < 4 || op->yes > len+4) | |
401 | return -EINVAL; | |
402 | case TCPDIAG_BC_JMP: | |
403 | if (op->no < 4 || op->no > len+4) | |
404 | return -EINVAL; | |
405 | if (op->no < len && | |
406 | !valid_cc(bytecode, bytecode_len, len-op->no)) | |
407 | return -EINVAL; | |
408 | break; | |
409 | case TCPDIAG_BC_NOP: | |
410 | if (op->yes < 4 || op->yes > len+4) | |
411 | return -EINVAL; | |
412 | break; | |
413 | default: | |
414 | return -EINVAL; | |
415 | } | |
416 | bc += op->yes; | |
417 | len -= op->yes; | |
418 | } | |
419 | return len == 0 ? 0 : -EINVAL; | |
420 | } | |
421 | ||
422 | static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk, | |
423 | struct netlink_callback *cb) | |
424 | { | |
425 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
426 | ||
427 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
428 | struct tcpdiag_entry entry; | |
429 | struct rtattr *bc = (struct rtattr *)(r + 1); | |
430 | struct inet_sock *inet = inet_sk(sk); | |
431 | ||
432 | entry.family = sk->sk_family; | |
433 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
434 | if (entry.family == AF_INET6) { | |
435 | struct ipv6_pinfo *np = inet6_sk(sk); | |
436 | ||
437 | entry.saddr = np->rcv_saddr.s6_addr32; | |
438 | entry.daddr = np->daddr.s6_addr32; | |
439 | } else | |
440 | #endif | |
441 | { | |
442 | entry.saddr = &inet->rcv_saddr; | |
443 | entry.daddr = &inet->daddr; | |
444 | } | |
445 | entry.sport = inet->num; | |
446 | entry.dport = ntohs(inet->dport); | |
447 | entry.userlocks = sk->sk_userlocks; | |
448 | ||
449 | if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) | |
450 | return 0; | |
451 | } | |
452 | ||
453 | return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid, | |
454 | cb->nlh->nlmsg_seq, NLM_F_MULTI); | |
455 | } | |
456 | ||
457 | static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk, | |
458 | struct open_request *req, | |
459 | u32 pid, u32 seq) | |
460 | { | |
461 | struct inet_sock *inet = inet_sk(sk); | |
462 | unsigned char *b = skb->tail; | |
463 | struct tcpdiagmsg *r; | |
464 | struct nlmsghdr *nlh; | |
465 | long tmo; | |
466 | ||
467 | nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); | |
468 | nlh->nlmsg_flags = NLM_F_MULTI; | |
469 | r = NLMSG_DATA(nlh); | |
470 | ||
471 | r->tcpdiag_family = sk->sk_family; | |
472 | r->tcpdiag_state = TCP_SYN_RECV; | |
473 | r->tcpdiag_timer = 1; | |
474 | r->tcpdiag_retrans = req->retrans; | |
475 | ||
476 | r->id.tcpdiag_if = sk->sk_bound_dev_if; | |
477 | r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req; | |
478 | r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); | |
479 | ||
480 | tmo = req->expires - jiffies; | |
481 | if (tmo < 0) | |
482 | tmo = 0; | |
483 | ||
484 | r->id.tcpdiag_sport = inet->sport; | |
485 | r->id.tcpdiag_dport = req->rmt_port; | |
486 | r->id.tcpdiag_src[0] = req->af.v4_req.loc_addr; | |
487 | r->id.tcpdiag_dst[0] = req->af.v4_req.rmt_addr; | |
488 | r->tcpdiag_expires = jiffies_to_msecs(tmo), | |
489 | r->tcpdiag_rqueue = 0; | |
490 | r->tcpdiag_wqueue = 0; | |
491 | r->tcpdiag_uid = sock_i_uid(sk); | |
492 | r->tcpdiag_inode = 0; | |
493 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
494 | if (r->tcpdiag_family == AF_INET6) { | |
495 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, | |
496 | &req->af.v6_req.loc_addr); | |
497 | ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, | |
498 | &req->af.v6_req.rmt_addr); | |
499 | } | |
500 | #endif | |
501 | nlh->nlmsg_len = skb->tail - b; | |
502 | ||
503 | return skb->len; | |
504 | ||
505 | nlmsg_failure: | |
506 | skb_trim(skb, b - skb->data); | |
507 | return -1; | |
508 | } | |
509 | ||
510 | static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk, | |
511 | struct netlink_callback *cb) | |
512 | { | |
513 | struct tcpdiag_entry entry; | |
514 | struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); | |
515 | struct tcp_sock *tp = tcp_sk(sk); | |
516 | struct tcp_listen_opt *lopt; | |
517 | struct rtattr *bc = NULL; | |
518 | struct inet_sock *inet = inet_sk(sk); | |
519 | int j, s_j; | |
520 | int reqnum, s_reqnum; | |
521 | int err = 0; | |
522 | ||
523 | s_j = cb->args[3]; | |
524 | s_reqnum = cb->args[4]; | |
525 | ||
526 | if (s_j > 0) | |
527 | s_j--; | |
528 | ||
529 | entry.family = sk->sk_family; | |
530 | ||
531 | read_lock_bh(&tp->syn_wait_lock); | |
532 | ||
533 | lopt = tp->listen_opt; | |
534 | if (!lopt || !lopt->qlen) | |
535 | goto out; | |
536 | ||
537 | if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { | |
538 | bc = (struct rtattr *)(r + 1); | |
539 | entry.sport = inet->num; | |
540 | entry.userlocks = sk->sk_userlocks; | |
541 | } | |
542 | ||
543 | for (j = s_j; j < TCP_SYNQ_HSIZE; j++) { | |
544 | struct open_request *req, *head = lopt->syn_table[j]; | |
545 | ||
546 | reqnum = 0; | |
547 | for (req = head; req; reqnum++, req = req->dl_next) { | |
548 | if (reqnum < s_reqnum) | |
549 | continue; | |
550 | if (r->id.tcpdiag_dport != req->rmt_port && | |
551 | r->id.tcpdiag_dport) | |
552 | continue; | |
553 | ||
554 | if (bc) { | |
555 | entry.saddr = | |
556 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
557 | (entry.family == AF_INET6) ? | |
558 | req->af.v6_req.loc_addr.s6_addr32 : | |
559 | #endif | |
560 | &req->af.v4_req.loc_addr; | |
561 | entry.daddr = | |
562 | #ifdef CONFIG_IP_TCPDIAG_IPV6 | |
563 | (entry.family == AF_INET6) ? | |
564 | req->af.v6_req.rmt_addr.s6_addr32 : | |
565 | #endif | |
566 | &req->af.v4_req.rmt_addr; | |
567 | entry.dport = ntohs(req->rmt_port); | |
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, | |
576 | cb->nlh->nlmsg_seq); | |
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: | |
588 | read_unlock_bh(&tp->syn_wait_lock); | |
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); | |
598 | ||
599 | s_i = cb->args[1]; | |
600 | s_num = num = cb->args[2]; | |
601 | ||
602 | if (cb->args[0] == 0) { | |
603 | if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV))) | |
604 | goto skip_listen_ht; | |
605 | tcp_listen_lock(); | |
606 | for (i = s_i; i < TCP_LHTABLE_SIZE; i++) { | |
607 | struct sock *sk; | |
608 | struct hlist_node *node; | |
609 | ||
610 | num = 0; | |
611 | sk_for_each(sk, node, &tcp_listening_hash[i]) { | |
612 | struct inet_sock *inet = inet_sk(sk); | |
613 | ||
614 | if (num < s_num) { | |
615 | num++; | |
616 | continue; | |
617 | } | |
618 | ||
619 | if (r->id.tcpdiag_sport != inet->sport && | |
620 | r->id.tcpdiag_sport) | |
621 | goto next_listen; | |
622 | ||
623 | if (!(r->tcpdiag_states&TCPF_LISTEN) || | |
624 | r->id.tcpdiag_dport || | |
625 | cb->args[3] > 0) | |
626 | goto syn_recv; | |
627 | ||
628 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
629 | tcp_listen_unlock(); | |
630 | goto done; | |
631 | } | |
632 | ||
633 | syn_recv: | |
634 | if (!(r->tcpdiag_states&TCPF_SYN_RECV)) | |
635 | goto next_listen; | |
636 | ||
637 | if (tcpdiag_dump_reqs(skb, sk, cb) < 0) { | |
638 | tcp_listen_unlock(); | |
639 | goto done; | |
640 | } | |
641 | ||
642 | next_listen: | |
643 | cb->args[3] = 0; | |
644 | cb->args[4] = 0; | |
645 | ++num; | |
646 | } | |
647 | ||
648 | s_num = 0; | |
649 | cb->args[3] = 0; | |
650 | cb->args[4] = 0; | |
651 | } | |
652 | tcp_listen_unlock(); | |
653 | skip_listen_ht: | |
654 | cb->args[0] = 1; | |
655 | s_i = num = s_num = 0; | |
656 | } | |
657 | ||
658 | if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV))) | |
659 | return skb->len; | |
660 | ||
661 | for (i = s_i; i < tcp_ehash_size; i++) { | |
662 | struct tcp_ehash_bucket *head = &tcp_ehash[i]; | |
663 | struct sock *sk; | |
664 | struct hlist_node *node; | |
665 | ||
666 | if (i > s_i) | |
667 | s_num = 0; | |
668 | ||
669 | read_lock_bh(&head->lock); | |
670 | ||
671 | num = 0; | |
672 | sk_for_each(sk, node, &head->chain) { | |
673 | struct inet_sock *inet = inet_sk(sk); | |
674 | ||
675 | if (num < s_num) | |
676 | goto next_normal; | |
677 | if (!(r->tcpdiag_states & (1 << sk->sk_state))) | |
678 | goto next_normal; | |
679 | if (r->id.tcpdiag_sport != inet->sport && | |
680 | r->id.tcpdiag_sport) | |
681 | goto next_normal; | |
682 | if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport) | |
683 | goto next_normal; | |
684 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
685 | read_unlock_bh(&head->lock); | |
686 | goto done; | |
687 | } | |
688 | next_normal: | |
689 | ++num; | |
690 | } | |
691 | ||
692 | if (r->tcpdiag_states&TCPF_TIME_WAIT) { | |
693 | sk_for_each(sk, node, | |
694 | &tcp_ehash[i + tcp_ehash_size].chain) { | |
695 | struct inet_sock *inet = inet_sk(sk); | |
696 | ||
697 | if (num < s_num) | |
698 | goto next_dying; | |
699 | if (r->id.tcpdiag_sport != inet->sport && | |
700 | r->id.tcpdiag_sport) | |
701 | goto next_dying; | |
702 | if (r->id.tcpdiag_dport != inet->dport && | |
703 | r->id.tcpdiag_dport) | |
704 | goto next_dying; | |
705 | if (tcpdiag_dump_sock(skb, sk, cb) < 0) { | |
706 | read_unlock_bh(&head->lock); | |
707 | goto done; | |
708 | } | |
709 | next_dying: | |
710 | ++num; | |
711 | } | |
712 | } | |
713 | read_unlock_bh(&head->lock); | |
714 | } | |
715 | ||
716 | done: | |
717 | cb->args[1] = i; | |
718 | cb->args[2] = num; | |
719 | return skb->len; | |
720 | } | |
721 | ||
722 | static int tcpdiag_dump_done(struct netlink_callback *cb) | |
723 | { | |
724 | return 0; | |
725 | } | |
726 | ||
727 | ||
728 | static __inline__ int | |
729 | tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
730 | { | |
731 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
732 | return 0; | |
733 | ||
734 | if (nlh->nlmsg_type != TCPDIAG_GETSOCK) | |
735 | goto err_inval; | |
736 | ||
737 | if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len) | |
738 | goto err_inval; | |
739 | ||
740 | if (nlh->nlmsg_flags&NLM_F_DUMP) { | |
741 | if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) { | |
742 | struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq)); | |
743 | if (rta->rta_type != TCPDIAG_REQ_BYTECODE || | |
744 | rta->rta_len < 8 || | |
745 | rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq))) | |
746 | goto err_inval; | |
747 | if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) | |
748 | goto err_inval; | |
749 | } | |
750 | return netlink_dump_start(tcpnl, skb, nlh, | |
751 | tcpdiag_dump, | |
752 | tcpdiag_dump_done); | |
753 | } else { | |
754 | return tcpdiag_get_exact(skb, nlh); | |
755 | } | |
756 | ||
757 | err_inval: | |
758 | return -EINVAL; | |
759 | } | |
760 | ||
761 | ||
762 | static inline void tcpdiag_rcv_skb(struct sk_buff *skb) | |
763 | { | |
764 | int err; | |
765 | struct nlmsghdr * nlh; | |
766 | ||
767 | if (skb->len >= NLMSG_SPACE(0)) { | |
768 | nlh = (struct nlmsghdr *)skb->data; | |
769 | if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) | |
770 | return; | |
771 | err = tcpdiag_rcv_msg(skb, nlh); | |
772 | if (err || nlh->nlmsg_flags & NLM_F_ACK) | |
773 | netlink_ack(skb, nlh, err); | |
774 | } | |
775 | } | |
776 | ||
777 | static void tcpdiag_rcv(struct sock *sk, int len) | |
778 | { | |
779 | struct sk_buff *skb; | |
780 | ||
781 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
782 | tcpdiag_rcv_skb(skb); | |
783 | kfree_skb(skb); | |
784 | } | |
785 | } | |
786 | ||
787 | static int __init tcpdiag_init(void) | |
788 | { | |
789 | tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv); | |
790 | if (tcpnl == NULL) | |
791 | return -ENOMEM; | |
792 | return 0; | |
793 | } | |
794 | ||
795 | static void __exit tcpdiag_exit(void) | |
796 | { | |
797 | sock_release(tcpnl->sk_socket); | |
798 | } | |
799 | ||
800 | module_init(tcpdiag_init); | |
801 | module_exit(tcpdiag_exit); | |
802 | MODULE_LICENSE("GPL"); |