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[NETFILTER]: Fix gcc-3.4.x warning about iplicit operator precedence
[mirror_ubuntu-zesty-kernel.git] / net / ipv4 / tcp_diag.c
CommitLineData
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
33struct tcpdiag_entry
34{
35 u32 *saddr;
36 u32 *daddr;
37 u16 sport;
38 u16 dport;
39 u16 family;
40 u16 userlocks;
41};
42
43static struct sock *tcpnl;
44
1da177e4 45#define TCPDIAG_PUT(skb, attrtype, attrlen) \
7c99c909 46 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
1da177e4 47
e41aac41 48#ifdef CONFIG_IP_TCPDIAG_DCCP
540722ff
ACM		 49extern struct inet_hashinfo dccp_hashinfo;
50#endif
51
1da177e4 52static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
540722ff
ACM		 53 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
54 const struct nlmsghdr *unlh)
1da177e4 55{
463c84b9 56 const struct inet_sock *inet = inet_sk(sk);
463c84b9 57 const struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 58 struct tcpdiagmsg *r;
59 struct nlmsghdr *nlh;
60 struct tcp_info *info = NULL;
61 struct tcpdiag_meminfo *minfo = NULL;
1da177e4
LT		 62 unsigned char *b = skb->tail;
63
540722ff 64 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
1da177e4
LT		 65 nlh->nlmsg_flags = nlmsg_flags;
66 r = NLMSG_DATA(nlh);
67 if (sk->sk_state != TCP_TIME_WAIT) {
68 if (ext & (1<<(TCPDIAG_MEMINFO-1)))
69 minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo));
70 if (ext & (1<<(TCPDIAG_INFO-1)))
71 info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info));
72
6687e988
ACM		 73 if ((ext & (1 << (TCPDIAG_CONG - 1))) && icsk->icsk_ca_ops) {
74 size_t len = strlen(icsk->icsk_ca_ops->name);
056ede6c 75 strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1),
6687e988 76 icsk->icsk_ca_ops->name);
056ede6c 77 }
1da177e4
LT		 78 }
79 r->tcpdiag_family = sk->sk_family;
80 r->tcpdiag_state = sk->sk_state;
81 r->tcpdiag_timer = 0;
82 r->tcpdiag_retrans = 0;
83
84 r->id.tcpdiag_if = sk->sk_bound_dev_if;
85 r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk;
86 r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
87
88 if (r->tcpdiag_state == TCP_TIME_WAIT) {
8feaf0c0 89 const struct inet_timewait_sock *tw = inet_twsk(sk);
1da177e4
LT		 90 long tmo = tw->tw_ttd - jiffies;
91 if (tmo < 0)
92 tmo = 0;
93
94 r->id.tcpdiag_sport = tw->tw_sport;
95 r->id.tcpdiag_dport = tw->tw_dport;
96 r->id.tcpdiag_src[0] = tw->tw_rcv_saddr;
97 r->id.tcpdiag_dst[0] = tw->tw_daddr;
98 r->tcpdiag_state = tw->tw_substate;
99 r->tcpdiag_timer = 3;
100 r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ;
101 r->tcpdiag_rqueue = 0;
102 r->tcpdiag_wqueue = 0;
103 r->tcpdiag_uid = 0;
104 r->tcpdiag_inode = 0;
105#ifdef CONFIG_IP_TCPDIAG_IPV6
106 if (r->tcpdiag_family == AF_INET6) {
8feaf0c0
ACM		 107 const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
108
1da177e4 109 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
8feaf0c0 110 &tcp6tw->tw_v6_rcv_saddr);
1da177e4 111 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
8feaf0c0 112 &tcp6tw->tw_v6_daddr);
1da177e4
LT		 113 }
114#endif
115 nlh->nlmsg_len = skb->tail - b;
116 return skb->len;
117 }
118
119 r->id.tcpdiag_sport = inet->sport;
120 r->id.tcpdiag_dport = inet->dport;
121 r->id.tcpdiag_src[0] = inet->rcv_saddr;
122 r->id.tcpdiag_dst[0] = inet->daddr;
123
124#ifdef CONFIG_IP_TCPDIAG_IPV6
125 if (r->tcpdiag_family == AF_INET6) {
126 struct ipv6_pinfo *np = inet6_sk(sk);
127
128 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
129 &np->rcv_saddr);
130 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
131 &np->daddr);
132 }
133#endif
134
135#define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ
136
463c84b9 137 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1da177e4 138 r->tcpdiag_timer = 1;
463c84b9
ACM		 139 r->tcpdiag_retrans = icsk->icsk_retransmits;
140 r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
141 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1da177e4 142 r->tcpdiag_timer = 4;
6687e988 143 r->tcpdiag_retrans = icsk->icsk_probes_out;
463c84b9 144 r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
1da177e4
LT		 145 } else if (timer_pending(&sk->sk_timer)) {
146 r->tcpdiag_timer = 2;
6687e988 147 r->tcpdiag_retrans = icsk->icsk_probes_out;
1da177e4
LT		 148 r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
149 } else {
150 r->tcpdiag_timer = 0;
151 r->tcpdiag_expires = 0;
152 }
153#undef EXPIRES_IN_MS
540722ff
ACM		 154 /*
155 * Ahem... for now we'll have some knowledge about TCP -acme
156 * But this is just one of two small exceptions, both in this
157 * function, so lets close our eyes for some 15 lines or so... 8)
158 * -acme
159 */
160 if (sk->sk_protocol == IPPROTO_TCP) {
161 const struct tcp_sock *tp = tcp_sk(sk);
162
163 r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
164 r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
165 } else
166 r->tcpdiag_rqueue = r->tcpdiag_wqueue = 0;
167
1da177e4
LT		 168 r->tcpdiag_uid = sock_i_uid(sk);
169 r->tcpdiag_inode = sock_i_ino(sk);
170
171 if (minfo) {
172 minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc);
173 minfo->tcpdiag_wmem = sk->sk_wmem_queued;
174 minfo->tcpdiag_fmem = sk->sk_forward_alloc;
175 minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc);
176 }
177
540722ff
ACM		 178 /* Ahem... for now we'll have some knowledge about TCP -acme */
179 if (info) {
180 if (sk->sk_protocol == IPPROTO_TCP)
181 tcp_get_info(sk, info);
182 else
183 memset(info, 0, sizeof(*info));
184 }
1da177e4 185
6687e988
ACM		 186 if (sk->sk_state < TCP_TIME_WAIT &&
187 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
188 icsk->icsk_ca_ops->get_info(sk, ext, skb);
1da177e4
LT		 189
190 nlh->nlmsg_len = skb->tail - b;
191 return skb->len;
192
7c99c909 193rtattr_failure:
1da177e4
LT		 194nlmsg_failure:
195 skb_trim(skb, b - skb->data);
196 return -1;
197}
198
1da177e4
LT		 199#ifdef CONFIG_IP_TCPDIAG_IPV6
200extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
201 struct in6_addr *daddr, u16 dport,
202 int dif);
203#else
204static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
205 struct in6_addr *daddr, u16 dport,
206 int dif)
207{
208 return NULL;
209}
210#endif
211
212static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
213{
214 int err;
215 struct sock *sk;
216 struct tcpdiagreq *req = NLMSG_DATA(nlh);
217 struct sk_buff *rep;
540722ff 218 struct inet_hashinfo *hashinfo = &tcp_hashinfo;
e41aac41 219#ifdef CONFIG_IP_TCPDIAG_DCCP
540722ff
ACM		 220 if (nlh->nlmsg_type == DCCPDIAG_GETSOCK)
221 hashinfo = &dccp_hashinfo;
222#endif
1da177e4 223 if (req->tcpdiag_family == AF_INET) {
540722ff 224 sk = inet_lookup(hashinfo, req->id.tcpdiag_dst[0],
e48c414e
ACM		 225 req->id.tcpdiag_dport, req->id.tcpdiag_src[0],
226 req->id.tcpdiag_sport, req->id.tcpdiag_if);
1da177e4
LT		 227 }
228#ifdef CONFIG_IP_TCPDIAG_IPV6
229 else if (req->tcpdiag_family == AF_INET6) {
230 sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport,
231 (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport,
232 req->id.tcpdiag_if);
233 }
234#endif
235 else {
236 return -EINVAL;
237 }
238
239 if (sk == NULL)
240 return -ENOENT;
241
242 err = -ESTALE;
243 if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE ||
244 req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) &&
245 ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] ||
246 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1]))
247 goto out;
248
249 err = -ENOMEM;
250 rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+
251 sizeof(struct tcpdiag_meminfo)+
252 sizeof(struct tcp_info)+64), GFP_KERNEL);
253 if (!rep)
254 goto out;
255
256 if (tcpdiag_fill(rep, sk, req->tcpdiag_ext,
257 NETLINK_CB(in_skb).pid,
540722ff 258 nlh->nlmsg_seq, 0, nlh) <= 0)
1da177e4
LT		 259 BUG();
260
261 err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
262 if (err > 0)
263 err = 0;
264
265out:
266 if (sk) {
267 if (sk->sk_state == TCP_TIME_WAIT)
8feaf0c0 268 inet_twsk_put((struct inet_timewait_sock *)sk);
1da177e4
LT		 269 else
270 sock_put(sk);
271 }
272 return err;
273}
274
275static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
276{
277 int words = bits >> 5;
278
279 bits &= 0x1f;
280
281 if (words) {
282 if (memcmp(a1, a2, words << 2))
283 return 0;
284 }
285 if (bits) {
286 __u32 w1, w2;
287 __u32 mask;
288
289 w1 = a1[words];
290 w2 = a2[words];
291
292 mask = htonl((0xffffffff) << (32 - bits));
293
294 if ((w1 ^ w2) & mask)
295 return 0;
296 }
297
298 return 1;
299}
300
301
302static int tcpdiag_bc_run(const void *bc, int len,
303 const struct tcpdiag_entry *entry)
304{
305 while (len > 0) {
306 int yes = 1;
307 const struct tcpdiag_bc_op *op = bc;
308
309 switch (op->code) {
310 case TCPDIAG_BC_NOP:
311 break;
312 case TCPDIAG_BC_JMP:
313 yes = 0;
314 break;
315 case TCPDIAG_BC_S_GE:
316 yes = entry->sport >= op[1].no;
317 break;
318 case TCPDIAG_BC_S_LE:
319 yes = entry->dport <= op[1].no;
320 break;
321 case TCPDIAG_BC_D_GE:
322 yes = entry->dport >= op[1].no;
323 break;
324 case TCPDIAG_BC_D_LE:
325 yes = entry->dport <= op[1].no;
326 break;
327 case TCPDIAG_BC_AUTO:
328 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
329 break;
330 case TCPDIAG_BC_S_COND:
331 case TCPDIAG_BC_D_COND:
332 {
333 struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1);
334 u32 *addr;
335
336 if (cond->port != -1 &&
337 cond->port != (op->code == TCPDIAG_BC_S_COND ?
338 entry->sport : entry->dport)) {
339 yes = 0;
340 break;
341 }
342
343 if (cond->prefix_len == 0)
344 break;
345
346 if (op->code == TCPDIAG_BC_S_COND)
347 addr = entry->saddr;
348 else
349 addr = entry->daddr;
350
351 if (bitstring_match(addr, cond->addr, cond->prefix_len))
352 break;
353 if (entry->family == AF_INET6 &&
354 cond->family == AF_INET) {
355 if (addr[0] == 0 && addr[1] == 0 &&
356 addr[2] == htonl(0xffff) &&
357 bitstring_match(addr+3, cond->addr, cond->prefix_len))
358 break;
359 }
360 yes = 0;
361 break;
362 }
363 }
364
365 if (yes) {
366 len -= op->yes;
367 bc += op->yes;
368 } else {
369 len -= op->no;
370 bc += op->no;
371 }
372 }
373 return (len == 0);
374}
375
376static int valid_cc(const void *bc, int len, int cc)
377{
378 while (len >= 0) {
379 const struct tcpdiag_bc_op *op = bc;
380
381 if (cc > len)
382 return 0;
383 if (cc == len)
384 return 1;
385 if (op->yes < 4)
386 return 0;
387 len -= op->yes;
388 bc += op->yes;
389 }
390 return 0;
391}
392
393static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len)
394{
395 const unsigned char *bc = bytecode;
396 int len = bytecode_len;
397
398 while (len > 0) {
399 struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc;
400
401//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
402 switch (op->code) {
403 case TCPDIAG_BC_AUTO:
404 case TCPDIAG_BC_S_COND:
405 case TCPDIAG_BC_D_COND:
406 case TCPDIAG_BC_S_GE:
407 case TCPDIAG_BC_S_LE:
408 case TCPDIAG_BC_D_GE:
409 case TCPDIAG_BC_D_LE:
410 if (op->yes < 4 || op->yes > len+4)
411 return -EINVAL;
412 case TCPDIAG_BC_JMP:
413 if (op->no < 4 || op->no > len+4)
414 return -EINVAL;
415 if (op->no < len &&
416 !valid_cc(bytecode, bytecode_len, len-op->no))
417 return -EINVAL;
418 break;
419 case TCPDIAG_BC_NOP:
420 if (op->yes < 4 || op->yes > len+4)
421 return -EINVAL;
422 break;
423 default:
424 return -EINVAL;
425 }
426 bc += op->yes;
427 len -= op->yes;
428 }
429 return len == 0 ? 0 : -EINVAL;
430}
431
432static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk,
433 struct netlink_callback *cb)
434{
435 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
436
437 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
438 struct tcpdiag_entry entry;
439 struct rtattr *bc = (struct rtattr *)(r + 1);
440 struct inet_sock *inet = inet_sk(sk);
441
442 entry.family = sk->sk_family;
443#ifdef CONFIG_IP_TCPDIAG_IPV6
444 if (entry.family == AF_INET6) {
445 struct ipv6_pinfo *np = inet6_sk(sk);
446
447 entry.saddr = np->rcv_saddr.s6_addr32;
448 entry.daddr = np->daddr.s6_addr32;
449 } else
450#endif
451 {
452 entry.saddr = &inet->rcv_saddr;
453 entry.daddr = &inet->daddr;
454 }
455 entry.sport = inet->num;
456 entry.dport = ntohs(inet->dport);
457 entry.userlocks = sk->sk_userlocks;
458
459 if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
460 return 0;
461 }
462
463 return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid,
540722ff 464 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
1da177e4
LT		 465}
466
467static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk,
60236fdd 468 struct request_sock *req,
540722ff
ACM		 469 u32 pid, u32 seq,
470 const struct nlmsghdr *unlh)
1da177e4 471{
2e6599cb 472 const struct inet_request_sock *ireq = inet_rsk(req);
1da177e4
LT		 473 struct inet_sock *inet = inet_sk(sk);
474 unsigned char *b = skb->tail;
475 struct tcpdiagmsg *r;
476 struct nlmsghdr *nlh;
477 long tmo;
478
540722ff 479 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
1da177e4
LT		 480 nlh->nlmsg_flags = NLM_F_MULTI;
481 r = NLMSG_DATA(nlh);
482
483 r->tcpdiag_family = sk->sk_family;
484 r->tcpdiag_state = TCP_SYN_RECV;
485 r->tcpdiag_timer = 1;
486 r->tcpdiag_retrans = req->retrans;
487
488 r->id.tcpdiag_if = sk->sk_bound_dev_if;
489 r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req;
490 r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
491
492 tmo = req->expires - jiffies;
493 if (tmo < 0)
494 tmo = 0;
495
496 r->id.tcpdiag_sport = inet->sport;
2e6599cb
ACM		 497 r->id.tcpdiag_dport = ireq->rmt_port;
498 r->id.tcpdiag_src[0] = ireq->loc_addr;
499 r->id.tcpdiag_dst[0] = ireq->rmt_addr;
1da177e4
LT		 500 r->tcpdiag_expires = jiffies_to_msecs(tmo),
501 r->tcpdiag_rqueue = 0;
502 r->tcpdiag_wqueue = 0;
503 r->tcpdiag_uid = sock_i_uid(sk);
504 r->tcpdiag_inode = 0;
505#ifdef CONFIG_IP_TCPDIAG_IPV6
506 if (r->tcpdiag_family == AF_INET6) {
507 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
2e6599cb 508 &tcp6_rsk(req)->loc_addr);
1da177e4 509 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
2e6599cb 510 &tcp6_rsk(req)->rmt_addr);
1da177e4
LT		 511 }
512#endif
513 nlh->nlmsg_len = skb->tail - b;
514
515 return skb->len;
516
517nlmsg_failure:
518 skb_trim(skb, b - skb->data);
519 return -1;
520}
521
522static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk,
523 struct netlink_callback *cb)
524{
525 struct tcpdiag_entry entry;
526 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
463c84b9 527 struct inet_connection_sock *icsk = inet_csk(sk);
2ad69c55 528 struct listen_sock *lopt;
1da177e4
LT		 529 struct rtattr *bc = NULL;
530 struct inet_sock *inet = inet_sk(sk);
531 int j, s_j;
532 int reqnum, s_reqnum;
533 int err = 0;
534
535 s_j = cb->args[3];
536 s_reqnum = cb->args[4];
537
538 if (s_j > 0)
539 s_j--;
540
541 entry.family = sk->sk_family;
542
463c84b9 543 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
1da177e4 544
463c84b9 545 lopt = icsk->icsk_accept_queue.listen_opt;
1da177e4
LT		 546 if (!lopt || !lopt->qlen)
547 goto out;
548
549 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
550 bc = (struct rtattr *)(r + 1);
551 entry.sport = inet->num;
552 entry.userlocks = sk->sk_userlocks;
553 }
554
540722ff 555 for (j = s_j; j < lopt->nr_table_entries; j++) {
60236fdd 556 struct request_sock *req, *head = lopt->syn_table[j];
1da177e4
LT		 557
558 reqnum = 0;
559 for (req = head; req; reqnum++, req = req->dl_next) {
2e6599cb
ACM		 560 struct inet_request_sock *ireq = inet_rsk(req);
561
1da177e4
LT		 562 if (reqnum < s_reqnum)
563 continue;
2e6599cb 564 if (r->id.tcpdiag_dport != ireq->rmt_port &&
1da177e4
LT		 565 r->id.tcpdiag_dport)
566 continue;
567
568 if (bc) {
569 entry.saddr =
570#ifdef CONFIG_IP_TCPDIAG_IPV6
571 (entry.family == AF_INET6) ?
2e6599cb 572 tcp6_rsk(req)->loc_addr.s6_addr32 :
1da177e4 573#endif
2e6599cb 574 &ireq->loc_addr;
1da177e4
LT		 575 entry.daddr =
576#ifdef CONFIG_IP_TCPDIAG_IPV6
577 (entry.family == AF_INET6) ?
2e6599cb 578 tcp6_rsk(req)->rmt_addr.s6_addr32 :
1da177e4 579#endif
2e6599cb
ACM		 580 &ireq->rmt_addr;
581 entry.dport = ntohs(ireq->rmt_port);
1da177e4
LT		 582
583 if (!tcpdiag_bc_run(RTA_DATA(bc),
584 RTA_PAYLOAD(bc), &entry))
585 continue;
586 }
587
588 err = tcpdiag_fill_req(skb, sk, req,
589 NETLINK_CB(cb->skb).pid,
540722ff 590 cb->nlh->nlmsg_seq, cb->nlh);
1da177e4
LT		 591 if (err < 0) {
592 cb->args[3] = j + 1;
593 cb->args[4] = reqnum;
594 goto out;
595 }
596 }
597
598 s_reqnum = 0;
599 }
600
601out:
463c84b9 602 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
1da177e4
LT		 603
604 return err;
605}
606
607static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb)
608{
609 int i, num;
610 int s_i, s_num;
611 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
540722ff 612 struct inet_hashinfo *hashinfo;
1da177e4
LT		 613
614 s_i = cb->args[1];
615 s_num = num = cb->args[2];
540722ff 616 hashinfo = &tcp_hashinfo;
e41aac41 617#ifdef CONFIG_IP_TCPDIAG_DCCP
540722ff
ACM		 618 if (cb->nlh->nlmsg_type == DCCPDIAG_GETSOCK)
619 hashinfo = &dccp_hashinfo;
620#endif
1da177e4
LT		 621 if (cb->args[0] == 0) {
622 if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
623 goto skip_listen_ht;
540722ff
ACM		 624
625 inet_listen_lock(hashinfo);
0f7ff927 626 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
1da177e4
LT		 627 struct sock *sk;
628 struct hlist_node *node;
629
630 num = 0;
540722ff 631 sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
1da177e4
LT		 632 struct inet_sock *inet = inet_sk(sk);
633
634 if (num < s_num) {
635 num++;
636 continue;
637 }
638
639 if (r->id.tcpdiag_sport != inet->sport &&
640 r->id.tcpdiag_sport)
641 goto next_listen;
642
643 if (!(r->tcpdiag_states&TCPF_LISTEN) ||
644 r->id.tcpdiag_dport ||
645 cb->args[3] > 0)
646 goto syn_recv;
647
648 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
540722ff 649 inet_listen_unlock(hashinfo);
1da177e4
LT		 650 goto done;
651 }
652
653syn_recv:
654 if (!(r->tcpdiag_states&TCPF_SYN_RECV))
655 goto next_listen;
656
657 if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
540722ff 658 inet_listen_unlock(hashinfo);
1da177e4
LT		 659 goto done;
660 }
661
662next_listen:
663 cb->args[3] = 0;
664 cb->args[4] = 0;
665 ++num;
666 }
667
668 s_num = 0;
669 cb->args[3] = 0;
670 cb->args[4] = 0;
671 }
540722ff 672 inet_listen_unlock(hashinfo);
1da177e4
LT		 673skip_listen_ht:
674 cb->args[0] = 1;
675 s_i = num = s_num = 0;
676 }
677
678 if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV)))
679 return skb->len;
680
540722ff
ACM		 681 for (i = s_i; i < hashinfo->ehash_size; i++) {
682 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1da177e4
LT		 683 struct sock *sk;
684 struct hlist_node *node;
685
686 if (i > s_i)
687 s_num = 0;
688
689 read_lock_bh(&head->lock);
690
691 num = 0;
692 sk_for_each(sk, node, &head->chain) {
693 struct inet_sock *inet = inet_sk(sk);
694
695 if (num < s_num)
696 goto next_normal;
697 if (!(r->tcpdiag_states & (1 << sk->sk_state)))
698 goto next_normal;
699 if (r->id.tcpdiag_sport != inet->sport &&
700 r->id.tcpdiag_sport)
701 goto next_normal;
702 if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport)
703 goto next_normal;
704 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
705 read_unlock_bh(&head->lock);
706 goto done;
707 }
708next_normal:
709 ++num;
710 }
711
712 if (r->tcpdiag_states&TCPF_TIME_WAIT) {
713 sk_for_each(sk, node,
540722ff 714 &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
1da177e4
LT		 715 struct inet_sock *inet = inet_sk(sk);
716
717 if (num < s_num)
718 goto next_dying;
719 if (r->id.tcpdiag_sport != inet->sport &&
720 r->id.tcpdiag_sport)
721 goto next_dying;
722 if (r->id.tcpdiag_dport != inet->dport &&
723 r->id.tcpdiag_dport)
724 goto next_dying;
725 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
726 read_unlock_bh(&head->lock);
727 goto done;
728 }
729next_dying:
730 ++num;
731 }
732 }
733 read_unlock_bh(&head->lock);
734 }
735
736done:
737 cb->args[1] = i;
738 cb->args[2] = num;
739 return skb->len;
740}
741
742static int tcpdiag_dump_done(struct netlink_callback *cb)
743{
744 return 0;
745}
746
747
748static __inline__ int
749tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
750{
751 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
752 return 0;
753
540722ff 754 if (nlh->nlmsg_type != TCPDIAG_GETSOCK
e41aac41 755#ifdef CONFIG_IP_TCPDIAG_DCCP
540722ff
ACM		 756 && nlh->nlmsg_type != DCCPDIAG_GETSOCK
757#endif
758 )
1da177e4
LT		 759 goto err_inval;
760
761 if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len)
762 goto err_inval;
763
764 if (nlh->nlmsg_flags&NLM_F_DUMP) {
765 if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) {
766 struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq));
767 if (rta->rta_type != TCPDIAG_REQ_BYTECODE ||
768 rta->rta_len < 8 ||
769 rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq)))
770 goto err_inval;
771 if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
772 goto err_inval;
773 }
774 return netlink_dump_start(tcpnl, skb, nlh,
775 tcpdiag_dump,
776 tcpdiag_dump_done);
777 } else {
778 return tcpdiag_get_exact(skb, nlh);
779 }
780
781err_inval:
782 return -EINVAL;
783}
784
785
786static inline void tcpdiag_rcv_skb(struct sk_buff *skb)
787{
788 int err;
789 struct nlmsghdr * nlh;
790
791 if (skb->len >= NLMSG_SPACE(0)) {
792 nlh = (struct nlmsghdr *)skb->data;
793 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
794 return;
795 err = tcpdiag_rcv_msg(skb, nlh);
796 if (err || nlh->nlmsg_flags & NLM_F_ACK)
797 netlink_ack(skb, nlh, err);
798 }
799}
800
801static void tcpdiag_rcv(struct sock *sk, int len)
802{
803 struct sk_buff *skb;
2a0a6ebe 804 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
1da177e4 805
2a0a6ebe 806 while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
1da177e4
LT		 807 tcpdiag_rcv_skb(skb);
808 kfree_skb(skb);
809 }
810}
811
812static int __init tcpdiag_init(void)
813{
4fdb3bb7
HW		 814 tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv,
815 THIS_MODULE);
1da177e4
LT		 816 if (tcpnl == NULL)
817 return -ENOMEM;
818 return 0;
819}
820
821static void __exit tcpdiag_exit(void)
822{
823 sock_release(tcpnl->sk_socket);
824}
825
826module_init(tcpdiag_init);
827module_exit(tcpdiag_exit);
828MODULE_LICENSE("GPL");
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