2 * tcp_diag.c Module for monitoring TCP sockets.
4 * Version: $Id: tcp_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
6 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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.
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>
26 #include <net/inet_common.h>
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>
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
35 #include <linux/tcp_diag.h>
47 static struct sock *tcpnl;
49 #define TCPDIAG_PUT(skb, attrtype, attrlen) \
50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
52 #ifdef CONFIG_IP_TCPDIAG_DCCP
53 extern struct inet_hashinfo dccp_hashinfo;
56 static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
57 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
58 const struct nlmsghdr *unlh)
60 const struct inet_sock *inet = inet_sk(sk);
61 const struct inet_connection_sock *icsk = inet_csk(sk);
64 struct tcp_info *info = NULL;
65 struct tcpdiag_meminfo *minfo = NULL;
66 unsigned char *b = skb->tail;
68 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
69 nlh->nlmsg_flags = nlmsg_flags;
71 if (sk->sk_state != TCP_TIME_WAIT) {
72 if (ext & (1<<(TCPDIAG_MEMINFO-1)))
73 minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo));
74 if (ext & (1<<(TCPDIAG_INFO-1)))
75 info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info));
77 if ((ext & (1 << (TCPDIAG_CONG - 1))) && icsk->icsk_ca_ops) {
78 size_t len = strlen(icsk->icsk_ca_ops->name);
79 strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1),
80 icsk->icsk_ca_ops->name);
83 r->tcpdiag_family = sk->sk_family;
84 r->tcpdiag_state = sk->sk_state;
86 r->tcpdiag_retrans = 0;
88 r->id.tcpdiag_if = sk->sk_bound_dev_if;
89 r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk;
90 r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
92 if (r->tcpdiag_state == TCP_TIME_WAIT) {
93 const struct inet_timewait_sock *tw = inet_twsk(sk);
94 long tmo = tw->tw_ttd - jiffies;
98 r->id.tcpdiag_sport = tw->tw_sport;
99 r->id.tcpdiag_dport = tw->tw_dport;
100 r->id.tcpdiag_src[0] = tw->tw_rcv_saddr;
101 r->id.tcpdiag_dst[0] = tw->tw_daddr;
102 r->tcpdiag_state = tw->tw_substate;
103 r->tcpdiag_timer = 3;
104 r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ;
105 r->tcpdiag_rqueue = 0;
106 r->tcpdiag_wqueue = 0;
108 r->tcpdiag_inode = 0;
109 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
110 if (r->tcpdiag_family == AF_INET6) {
111 const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
113 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
114 &tcp6tw->tw_v6_rcv_saddr);
115 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
116 &tcp6tw->tw_v6_daddr);
119 nlh->nlmsg_len = skb->tail - b;
123 r->id.tcpdiag_sport = inet->sport;
124 r->id.tcpdiag_dport = inet->dport;
125 r->id.tcpdiag_src[0] = inet->rcv_saddr;
126 r->id.tcpdiag_dst[0] = inet->daddr;
128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
129 if (r->tcpdiag_family == AF_INET6) {
130 struct ipv6_pinfo *np = inet6_sk(sk);
132 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
134 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
139 #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ
141 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
142 r->tcpdiag_timer = 1;
143 r->tcpdiag_retrans = icsk->icsk_retransmits;
144 r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
145 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
146 r->tcpdiag_timer = 4;
147 r->tcpdiag_retrans = icsk->icsk_probes_out;
148 r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
149 } else if (timer_pending(&sk->sk_timer)) {
150 r->tcpdiag_timer = 2;
151 r->tcpdiag_retrans = icsk->icsk_probes_out;
152 r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
154 r->tcpdiag_timer = 0;
155 r->tcpdiag_expires = 0;
159 * Ahem... for now we'll have some knowledge about TCP -acme
160 * But this is just one of two small exceptions, both in this
161 * function, so lets close our eyes for some 15 lines or so... 8)
164 if (sk->sk_protocol == IPPROTO_TCP) {
165 const struct tcp_sock *tp = tcp_sk(sk);
167 r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
168 r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
170 r->tcpdiag_rqueue = r->tcpdiag_wqueue = 0;
172 r->tcpdiag_uid = sock_i_uid(sk);
173 r->tcpdiag_inode = sock_i_ino(sk);
176 minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc);
177 minfo->tcpdiag_wmem = sk->sk_wmem_queued;
178 minfo->tcpdiag_fmem = sk->sk_forward_alloc;
179 minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc);
182 /* Ahem... for now we'll have some knowledge about TCP -acme */
184 if (sk->sk_protocol == IPPROTO_TCP)
185 tcp_get_info(sk, info);
187 memset(info, 0, sizeof(*info));
190 if (sk->sk_state < TCP_TIME_WAIT &&
191 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
192 icsk->icsk_ca_ops->get_info(sk, ext, skb);
194 nlh->nlmsg_len = skb->tail - b;
199 skb_trim(skb, b - skb->data);
203 static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
207 struct tcpdiagreq *req = NLMSG_DATA(nlh);
209 struct inet_hashinfo *hashinfo = &tcp_hashinfo;
210 #ifdef CONFIG_IP_TCPDIAG_DCCP
211 if (nlh->nlmsg_type == DCCPDIAG_GETSOCK)
212 hashinfo = &dccp_hashinfo;
214 if (req->tcpdiag_family == AF_INET) {
215 sk = inet_lookup(hashinfo, req->id.tcpdiag_dst[0],
216 req->id.tcpdiag_dport, req->id.tcpdiag_src[0],
217 req->id.tcpdiag_sport, req->id.tcpdiag_if);
219 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
220 else if (req->tcpdiag_family == AF_INET6) {
221 sk = inet6_lookup(hashinfo,
222 (struct in6_addr*)req->id.tcpdiag_dst,
223 req->id.tcpdiag_dport,
224 (struct in6_addr*)req->id.tcpdiag_src,
225 req->id.tcpdiag_sport,
237 if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE ||
238 req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) &&
239 ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] ||
240 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1]))
244 rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+
245 sizeof(struct tcpdiag_meminfo)+
246 sizeof(struct tcp_info)+64), GFP_KERNEL);
250 if (tcpdiag_fill(rep, sk, req->tcpdiag_ext,
251 NETLINK_CB(in_skb).pid,
252 nlh->nlmsg_seq, 0, nlh) <= 0)
255 err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
261 if (sk->sk_state == TCP_TIME_WAIT)
262 inet_twsk_put((struct inet_timewait_sock *)sk);
269 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
271 int words = bits >> 5;
276 if (memcmp(a1, a2, words << 2))
286 mask = htonl((0xffffffff) << (32 - bits));
288 if ((w1 ^ w2) & mask)
296 static int tcpdiag_bc_run(const void *bc, int len,
297 const struct tcpdiag_entry *entry)
301 const struct tcpdiag_bc_op *op = bc;
309 case TCPDIAG_BC_S_GE:
310 yes = entry->sport >= op[1].no;
312 case TCPDIAG_BC_S_LE:
313 yes = entry->dport <= op[1].no;
315 case TCPDIAG_BC_D_GE:
316 yes = entry->dport >= op[1].no;
318 case TCPDIAG_BC_D_LE:
319 yes = entry->dport <= op[1].no;
321 case TCPDIAG_BC_AUTO:
322 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
324 case TCPDIAG_BC_S_COND:
325 case TCPDIAG_BC_D_COND:
327 struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1);
330 if (cond->port != -1 &&
331 cond->port != (op->code == TCPDIAG_BC_S_COND ?
332 entry->sport : entry->dport)) {
337 if (cond->prefix_len == 0)
340 if (op->code == TCPDIAG_BC_S_COND)
345 if (bitstring_match(addr, cond->addr, cond->prefix_len))
347 if (entry->family == AF_INET6 &&
348 cond->family == AF_INET) {
349 if (addr[0] == 0 && addr[1] == 0 &&
350 addr[2] == htonl(0xffff) &&
351 bitstring_match(addr+3, cond->addr, cond->prefix_len))
370 static int valid_cc(const void *bc, int len, int cc)
373 const struct tcpdiag_bc_op *op = bc;
387 static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len)
389 const unsigned char *bc = bytecode;
390 int len = bytecode_len;
393 struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc;
395 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
397 case TCPDIAG_BC_AUTO:
398 case TCPDIAG_BC_S_COND:
399 case TCPDIAG_BC_D_COND:
400 case TCPDIAG_BC_S_GE:
401 case TCPDIAG_BC_S_LE:
402 case TCPDIAG_BC_D_GE:
403 case TCPDIAG_BC_D_LE:
404 if (op->yes < 4 || op->yes > len+4)
407 if (op->no < 4 || op->no > len+4)
410 !valid_cc(bytecode, bytecode_len, len-op->no))
414 if (op->yes < 4 || op->yes > len+4)
423 return len == 0 ? 0 : -EINVAL;
426 static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk,
427 struct netlink_callback *cb)
429 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
431 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
432 struct tcpdiag_entry entry;
433 struct rtattr *bc = (struct rtattr *)(r + 1);
434 struct inet_sock *inet = inet_sk(sk);
436 entry.family = sk->sk_family;
437 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
438 if (entry.family == AF_INET6) {
439 struct ipv6_pinfo *np = inet6_sk(sk);
441 entry.saddr = np->rcv_saddr.s6_addr32;
442 entry.daddr = np->daddr.s6_addr32;
446 entry.saddr = &inet->rcv_saddr;
447 entry.daddr = &inet->daddr;
449 entry.sport = inet->num;
450 entry.dport = ntohs(inet->dport);
451 entry.userlocks = sk->sk_userlocks;
453 if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
457 return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid,
458 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
461 static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk,
462 struct request_sock *req,
464 const struct nlmsghdr *unlh)
466 const struct inet_request_sock *ireq = inet_rsk(req);
467 struct inet_sock *inet = inet_sk(sk);
468 unsigned char *b = skb->tail;
469 struct tcpdiagmsg *r;
470 struct nlmsghdr *nlh;
473 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
474 nlh->nlmsg_flags = NLM_F_MULTI;
477 r->tcpdiag_family = sk->sk_family;
478 r->tcpdiag_state = TCP_SYN_RECV;
479 r->tcpdiag_timer = 1;
480 r->tcpdiag_retrans = req->retrans;
482 r->id.tcpdiag_if = sk->sk_bound_dev_if;
483 r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req;
484 r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
486 tmo = req->expires - jiffies;
490 r->id.tcpdiag_sport = inet->sport;
491 r->id.tcpdiag_dport = ireq->rmt_port;
492 r->id.tcpdiag_src[0] = ireq->loc_addr;
493 r->id.tcpdiag_dst[0] = ireq->rmt_addr;
494 r->tcpdiag_expires = jiffies_to_msecs(tmo),
495 r->tcpdiag_rqueue = 0;
496 r->tcpdiag_wqueue = 0;
497 r->tcpdiag_uid = sock_i_uid(sk);
498 r->tcpdiag_inode = 0;
499 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
500 if (r->tcpdiag_family == AF_INET6) {
501 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
502 &tcp6_rsk(req)->loc_addr);
503 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
504 &tcp6_rsk(req)->rmt_addr);
507 nlh->nlmsg_len = skb->tail - b;
512 skb_trim(skb, b - skb->data);
516 static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk,
517 struct netlink_callback *cb)
519 struct tcpdiag_entry entry;
520 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
521 struct inet_connection_sock *icsk = inet_csk(sk);
522 struct listen_sock *lopt;
523 struct rtattr *bc = NULL;
524 struct inet_sock *inet = inet_sk(sk);
526 int reqnum, s_reqnum;
530 s_reqnum = cb->args[4];
535 entry.family = sk->sk_family;
537 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
539 lopt = icsk->icsk_accept_queue.listen_opt;
540 if (!lopt || !lopt->qlen)
543 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
544 bc = (struct rtattr *)(r + 1);
545 entry.sport = inet->num;
546 entry.userlocks = sk->sk_userlocks;
549 for (j = s_j; j < lopt->nr_table_entries; j++) {
550 struct request_sock *req, *head = lopt->syn_table[j];
553 for (req = head; req; reqnum++, req = req->dl_next) {
554 struct inet_request_sock *ireq = inet_rsk(req);
556 if (reqnum < s_reqnum)
558 if (r->id.tcpdiag_dport != ireq->rmt_port &&
564 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
565 (entry.family == AF_INET6) ?
566 tcp6_rsk(req)->loc_addr.s6_addr32 :
570 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
571 (entry.family == AF_INET6) ?
572 tcp6_rsk(req)->rmt_addr.s6_addr32 :
575 entry.dport = ntohs(ireq->rmt_port);
577 if (!tcpdiag_bc_run(RTA_DATA(bc),
578 RTA_PAYLOAD(bc), &entry))
582 err = tcpdiag_fill_req(skb, sk, req,
583 NETLINK_CB(cb->skb).pid,
584 cb->nlh->nlmsg_seq, cb->nlh);
587 cb->args[4] = reqnum;
596 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
601 static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb)
605 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
606 struct inet_hashinfo *hashinfo;
609 s_num = num = cb->args[2];
610 hashinfo = &tcp_hashinfo;
611 #ifdef CONFIG_IP_TCPDIAG_DCCP
612 if (cb->nlh->nlmsg_type == DCCPDIAG_GETSOCK)
613 hashinfo = &dccp_hashinfo;
615 if (cb->args[0] == 0) {
616 if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
619 inet_listen_lock(hashinfo);
620 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
622 struct hlist_node *node;
625 sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
626 struct inet_sock *inet = inet_sk(sk);
633 if (r->id.tcpdiag_sport != inet->sport &&
637 if (!(r->tcpdiag_states&TCPF_LISTEN) ||
638 r->id.tcpdiag_dport ||
642 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
643 inet_listen_unlock(hashinfo);
648 if (!(r->tcpdiag_states&TCPF_SYN_RECV))
651 if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
652 inet_listen_unlock(hashinfo);
666 inet_listen_unlock(hashinfo);
669 s_i = num = s_num = 0;
672 if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV)))
675 for (i = s_i; i < hashinfo->ehash_size; i++) {
676 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
678 struct hlist_node *node;
683 read_lock_bh(&head->lock);
686 sk_for_each(sk, node, &head->chain) {
687 struct inet_sock *inet = inet_sk(sk);
691 if (!(r->tcpdiag_states & (1 << sk->sk_state)))
693 if (r->id.tcpdiag_sport != inet->sport &&
696 if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport)
698 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
699 read_unlock_bh(&head->lock);
706 if (r->tcpdiag_states&TCPF_TIME_WAIT) {
707 sk_for_each(sk, node,
708 &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
709 struct inet_sock *inet = inet_sk(sk);
713 if (r->id.tcpdiag_sport != inet->sport &&
716 if (r->id.tcpdiag_dport != inet->dport &&
719 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
720 read_unlock_bh(&head->lock);
727 read_unlock_bh(&head->lock);
736 static int tcpdiag_dump_done(struct netlink_callback *cb)
742 static __inline__ int
743 tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
745 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
748 if (nlh->nlmsg_type != TCPDIAG_GETSOCK
749 #ifdef CONFIG_IP_TCPDIAG_DCCP
750 && nlh->nlmsg_type != DCCPDIAG_GETSOCK
755 if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len)
758 if (nlh->nlmsg_flags&NLM_F_DUMP) {
759 if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) {
760 struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq));
761 if (rta->rta_type != TCPDIAG_REQ_BYTECODE ||
763 rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq)))
765 if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
768 return netlink_dump_start(tcpnl, skb, nlh,
772 return tcpdiag_get_exact(skb, nlh);
780 static inline void tcpdiag_rcv_skb(struct sk_buff *skb)
783 struct nlmsghdr * nlh;
785 if (skb->len >= NLMSG_SPACE(0)) {
786 nlh = (struct nlmsghdr *)skb->data;
787 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
789 err = tcpdiag_rcv_msg(skb, nlh);
790 if (err || nlh->nlmsg_flags & NLM_F_ACK)
791 netlink_ack(skb, nlh, err);
795 static void tcpdiag_rcv(struct sock *sk, int len)
798 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
800 while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
801 tcpdiag_rcv_skb(skb);
806 static int __init tcpdiag_init(void)
808 tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv,
815 static void __exit tcpdiag_exit(void)
817 sock_release(tcpnl->sk_socket);
820 module_init(tcpdiag_init);
821 module_exit(tcpdiag_exit);
822 MODULE_LICENSE("GPL");