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>
28 #include <linux/inet.h>
29 #include <linux/stddef.h>
31 #include <linux/tcp_diag.h>
43 static struct sock *tcpnl;
45 #define TCPDIAG_PUT(skb, attrtype, attrlen) \
46 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
48 static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
49 int ext, u32 pid, u32 seq, u16 nlmsg_flags)
51 const struct inet_sock *inet = inet_sk(sk);
52 struct tcp_sock *tp = tcp_sk(sk);
53 const struct inet_connection_sock *icsk = inet_csk(sk);
56 struct tcp_info *info = NULL;
57 struct tcpdiag_meminfo *minfo = NULL;
58 unsigned char *b = skb->tail;
60 nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
61 nlh->nlmsg_flags = nlmsg_flags;
63 if (sk->sk_state != TCP_TIME_WAIT) {
64 if (ext & (1<<(TCPDIAG_MEMINFO-1)))
65 minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo));
66 if (ext & (1<<(TCPDIAG_INFO-1)))
67 info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info));
69 if ((ext & (1 << (TCPDIAG_CONG - 1))) && icsk->icsk_ca_ops) {
70 size_t len = strlen(icsk->icsk_ca_ops->name);
71 strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1),
72 icsk->icsk_ca_ops->name);
75 r->tcpdiag_family = sk->sk_family;
76 r->tcpdiag_state = sk->sk_state;
78 r->tcpdiag_retrans = 0;
80 r->id.tcpdiag_if = sk->sk_bound_dev_if;
81 r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk;
82 r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
84 if (r->tcpdiag_state == TCP_TIME_WAIT) {
85 const struct inet_timewait_sock *tw = inet_twsk(sk);
86 long tmo = tw->tw_ttd - jiffies;
90 r->id.tcpdiag_sport = tw->tw_sport;
91 r->id.tcpdiag_dport = tw->tw_dport;
92 r->id.tcpdiag_src[0] = tw->tw_rcv_saddr;
93 r->id.tcpdiag_dst[0] = tw->tw_daddr;
94 r->tcpdiag_state = tw->tw_substate;
96 r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ;
97 r->tcpdiag_rqueue = 0;
98 r->tcpdiag_wqueue = 0;
100 r->tcpdiag_inode = 0;
101 #ifdef CONFIG_IP_TCPDIAG_IPV6
102 if (r->tcpdiag_family == AF_INET6) {
103 const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
105 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
106 &tcp6tw->tw_v6_rcv_saddr);
107 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
108 &tcp6tw->tw_v6_daddr);
111 nlh->nlmsg_len = skb->tail - b;
115 r->id.tcpdiag_sport = inet->sport;
116 r->id.tcpdiag_dport = inet->dport;
117 r->id.tcpdiag_src[0] = inet->rcv_saddr;
118 r->id.tcpdiag_dst[0] = inet->daddr;
120 #ifdef CONFIG_IP_TCPDIAG_IPV6
121 if (r->tcpdiag_family == AF_INET6) {
122 struct ipv6_pinfo *np = inet6_sk(sk);
124 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
126 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
131 #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ
133 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
134 r->tcpdiag_timer = 1;
135 r->tcpdiag_retrans = icsk->icsk_retransmits;
136 r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
137 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
138 r->tcpdiag_timer = 4;
139 r->tcpdiag_retrans = icsk->icsk_probes_out;
140 r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
141 } else if (timer_pending(&sk->sk_timer)) {
142 r->tcpdiag_timer = 2;
143 r->tcpdiag_retrans = icsk->icsk_probes_out;
144 r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
146 r->tcpdiag_timer = 0;
147 r->tcpdiag_expires = 0;
150 r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
151 r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
152 r->tcpdiag_uid = sock_i_uid(sk);
153 r->tcpdiag_inode = sock_i_ino(sk);
156 minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc);
157 minfo->tcpdiag_wmem = sk->sk_wmem_queued;
158 minfo->tcpdiag_fmem = sk->sk_forward_alloc;
159 minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc);
163 tcp_get_info(sk, info);
165 if (sk->sk_state < TCP_TIME_WAIT &&
166 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
167 icsk->icsk_ca_ops->get_info(sk, ext, skb);
169 nlh->nlmsg_len = skb->tail - b;
174 skb_trim(skb, b - skb->data);
178 #ifdef CONFIG_IP_TCPDIAG_IPV6
179 extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
180 struct in6_addr *daddr, u16 dport,
183 static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
184 struct in6_addr *daddr, u16 dport,
191 static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
195 struct tcpdiagreq *req = NLMSG_DATA(nlh);
198 if (req->tcpdiag_family == AF_INET) {
199 sk = inet_lookup(&tcp_hashinfo, req->id.tcpdiag_dst[0],
200 req->id.tcpdiag_dport, req->id.tcpdiag_src[0],
201 req->id.tcpdiag_sport, req->id.tcpdiag_if);
203 #ifdef CONFIG_IP_TCPDIAG_IPV6
204 else if (req->tcpdiag_family == AF_INET6) {
205 sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport,
206 (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport,
218 if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE ||
219 req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) &&
220 ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] ||
221 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1]))
225 rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+
226 sizeof(struct tcpdiag_meminfo)+
227 sizeof(struct tcp_info)+64), GFP_KERNEL);
231 if (tcpdiag_fill(rep, sk, req->tcpdiag_ext,
232 NETLINK_CB(in_skb).pid,
233 nlh->nlmsg_seq, 0) <= 0)
236 err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
242 if (sk->sk_state == TCP_TIME_WAIT)
243 inet_twsk_put((struct inet_timewait_sock *)sk);
250 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
252 int words = bits >> 5;
257 if (memcmp(a1, a2, words << 2))
267 mask = htonl((0xffffffff) << (32 - bits));
269 if ((w1 ^ w2) & mask)
277 static int tcpdiag_bc_run(const void *bc, int len,
278 const struct tcpdiag_entry *entry)
282 const struct tcpdiag_bc_op *op = bc;
290 case TCPDIAG_BC_S_GE:
291 yes = entry->sport >= op[1].no;
293 case TCPDIAG_BC_S_LE:
294 yes = entry->dport <= op[1].no;
296 case TCPDIAG_BC_D_GE:
297 yes = entry->dport >= op[1].no;
299 case TCPDIAG_BC_D_LE:
300 yes = entry->dport <= op[1].no;
302 case TCPDIAG_BC_AUTO:
303 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
305 case TCPDIAG_BC_S_COND:
306 case TCPDIAG_BC_D_COND:
308 struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1);
311 if (cond->port != -1 &&
312 cond->port != (op->code == TCPDIAG_BC_S_COND ?
313 entry->sport : entry->dport)) {
318 if (cond->prefix_len == 0)
321 if (op->code == TCPDIAG_BC_S_COND)
326 if (bitstring_match(addr, cond->addr, cond->prefix_len))
328 if (entry->family == AF_INET6 &&
329 cond->family == AF_INET) {
330 if (addr[0] == 0 && addr[1] == 0 &&
331 addr[2] == htonl(0xffff) &&
332 bitstring_match(addr+3, cond->addr, cond->prefix_len))
351 static int valid_cc(const void *bc, int len, int cc)
354 const struct tcpdiag_bc_op *op = bc;
368 static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len)
370 const unsigned char *bc = bytecode;
371 int len = bytecode_len;
374 struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc;
376 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
378 case TCPDIAG_BC_AUTO:
379 case TCPDIAG_BC_S_COND:
380 case TCPDIAG_BC_D_COND:
381 case TCPDIAG_BC_S_GE:
382 case TCPDIAG_BC_S_LE:
383 case TCPDIAG_BC_D_GE:
384 case TCPDIAG_BC_D_LE:
385 if (op->yes < 4 || op->yes > len+4)
388 if (op->no < 4 || op->no > len+4)
391 !valid_cc(bytecode, bytecode_len, len-op->no))
395 if (op->yes < 4 || op->yes > len+4)
404 return len == 0 ? 0 : -EINVAL;
407 static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk,
408 struct netlink_callback *cb)
410 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
412 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
413 struct tcpdiag_entry entry;
414 struct rtattr *bc = (struct rtattr *)(r + 1);
415 struct inet_sock *inet = inet_sk(sk);
417 entry.family = sk->sk_family;
418 #ifdef CONFIG_IP_TCPDIAG_IPV6
419 if (entry.family == AF_INET6) {
420 struct ipv6_pinfo *np = inet6_sk(sk);
422 entry.saddr = np->rcv_saddr.s6_addr32;
423 entry.daddr = np->daddr.s6_addr32;
427 entry.saddr = &inet->rcv_saddr;
428 entry.daddr = &inet->daddr;
430 entry.sport = inet->num;
431 entry.dport = ntohs(inet->dport);
432 entry.userlocks = sk->sk_userlocks;
434 if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
438 return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid,
439 cb->nlh->nlmsg_seq, NLM_F_MULTI);
442 static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk,
443 struct request_sock *req,
446 const struct inet_request_sock *ireq = inet_rsk(req);
447 struct inet_sock *inet = inet_sk(sk);
448 unsigned char *b = skb->tail;
449 struct tcpdiagmsg *r;
450 struct nlmsghdr *nlh;
453 nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
454 nlh->nlmsg_flags = NLM_F_MULTI;
457 r->tcpdiag_family = sk->sk_family;
458 r->tcpdiag_state = TCP_SYN_RECV;
459 r->tcpdiag_timer = 1;
460 r->tcpdiag_retrans = req->retrans;
462 r->id.tcpdiag_if = sk->sk_bound_dev_if;
463 r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req;
464 r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
466 tmo = req->expires - jiffies;
470 r->id.tcpdiag_sport = inet->sport;
471 r->id.tcpdiag_dport = ireq->rmt_port;
472 r->id.tcpdiag_src[0] = ireq->loc_addr;
473 r->id.tcpdiag_dst[0] = ireq->rmt_addr;
474 r->tcpdiag_expires = jiffies_to_msecs(tmo),
475 r->tcpdiag_rqueue = 0;
476 r->tcpdiag_wqueue = 0;
477 r->tcpdiag_uid = sock_i_uid(sk);
478 r->tcpdiag_inode = 0;
479 #ifdef CONFIG_IP_TCPDIAG_IPV6
480 if (r->tcpdiag_family == AF_INET6) {
481 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
482 &tcp6_rsk(req)->loc_addr);
483 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
484 &tcp6_rsk(req)->rmt_addr);
487 nlh->nlmsg_len = skb->tail - b;
492 skb_trim(skb, b - skb->data);
496 static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk,
497 struct netlink_callback *cb)
499 struct tcpdiag_entry entry;
500 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
501 struct inet_connection_sock *icsk = inet_csk(sk);
502 struct listen_sock *lopt;
503 struct rtattr *bc = NULL;
504 struct inet_sock *inet = inet_sk(sk);
506 int reqnum, s_reqnum;
510 s_reqnum = cb->args[4];
515 entry.family = sk->sk_family;
517 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
519 lopt = icsk->icsk_accept_queue.listen_opt;
520 if (!lopt || !lopt->qlen)
523 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
524 bc = (struct rtattr *)(r + 1);
525 entry.sport = inet->num;
526 entry.userlocks = sk->sk_userlocks;
529 for (j = s_j; j < TCP_SYNQ_HSIZE; j++) {
530 struct request_sock *req, *head = lopt->syn_table[j];
533 for (req = head; req; reqnum++, req = req->dl_next) {
534 struct inet_request_sock *ireq = inet_rsk(req);
536 if (reqnum < s_reqnum)
538 if (r->id.tcpdiag_dport != ireq->rmt_port &&
544 #ifdef CONFIG_IP_TCPDIAG_IPV6
545 (entry.family == AF_INET6) ?
546 tcp6_rsk(req)->loc_addr.s6_addr32 :
550 #ifdef CONFIG_IP_TCPDIAG_IPV6
551 (entry.family == AF_INET6) ?
552 tcp6_rsk(req)->rmt_addr.s6_addr32 :
555 entry.dport = ntohs(ireq->rmt_port);
557 if (!tcpdiag_bc_run(RTA_DATA(bc),
558 RTA_PAYLOAD(bc), &entry))
562 err = tcpdiag_fill_req(skb, sk, req,
563 NETLINK_CB(cb->skb).pid,
567 cb->args[4] = reqnum;
576 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
581 static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb)
585 struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
588 s_num = num = cb->args[2];
590 if (cb->args[0] == 0) {
591 if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
593 inet_listen_lock(&tcp_hashinfo);
594 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
596 struct hlist_node *node;
599 sk_for_each(sk, node, &tcp_hashinfo.listening_hash[i]) {
600 struct inet_sock *inet = inet_sk(sk);
607 if (r->id.tcpdiag_sport != inet->sport &&
611 if (!(r->tcpdiag_states&TCPF_LISTEN) ||
612 r->id.tcpdiag_dport ||
616 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
617 inet_listen_unlock(&tcp_hashinfo);
622 if (!(r->tcpdiag_states&TCPF_SYN_RECV))
625 if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
626 inet_listen_unlock(&tcp_hashinfo);
640 inet_listen_unlock(&tcp_hashinfo);
643 s_i = num = s_num = 0;
646 if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV)))
649 for (i = s_i; i < tcp_hashinfo.ehash_size; i++) {
650 struct inet_ehash_bucket *head = &tcp_hashinfo.ehash[i];
652 struct hlist_node *node;
657 read_lock_bh(&head->lock);
660 sk_for_each(sk, node, &head->chain) {
661 struct inet_sock *inet = inet_sk(sk);
665 if (!(r->tcpdiag_states & (1 << sk->sk_state)))
667 if (r->id.tcpdiag_sport != inet->sport &&
670 if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport)
672 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
673 read_unlock_bh(&head->lock);
680 if (r->tcpdiag_states&TCPF_TIME_WAIT) {
681 sk_for_each(sk, node,
682 &tcp_hashinfo.ehash[i + tcp_hashinfo.ehash_size].chain) {
683 struct inet_sock *inet = inet_sk(sk);
687 if (r->id.tcpdiag_sport != inet->sport &&
690 if (r->id.tcpdiag_dport != inet->dport &&
693 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
694 read_unlock_bh(&head->lock);
701 read_unlock_bh(&head->lock);
710 static int tcpdiag_dump_done(struct netlink_callback *cb)
716 static __inline__ int
717 tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
719 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
722 if (nlh->nlmsg_type != TCPDIAG_GETSOCK)
725 if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len)
728 if (nlh->nlmsg_flags&NLM_F_DUMP) {
729 if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) {
730 struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq));
731 if (rta->rta_type != TCPDIAG_REQ_BYTECODE ||
733 rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq)))
735 if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
738 return netlink_dump_start(tcpnl, skb, nlh,
742 return tcpdiag_get_exact(skb, nlh);
750 static inline void tcpdiag_rcv_skb(struct sk_buff *skb)
753 struct nlmsghdr * nlh;
755 if (skb->len >= NLMSG_SPACE(0)) {
756 nlh = (struct nlmsghdr *)skb->data;
757 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
759 err = tcpdiag_rcv_msg(skb, nlh);
760 if (err || nlh->nlmsg_flags & NLM_F_ACK)
761 netlink_ack(skb, nlh, err);
765 static void tcpdiag_rcv(struct sock *sk, int len)
768 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
770 while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
771 tcpdiag_rcv_skb(skb);
776 static int __init tcpdiag_init(void)
778 tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv,
785 static void __exit tcpdiag_exit(void)
787 sock_release(tcpnl->sk_socket);
790 module_init(tcpdiag_init);
791 module_exit(tcpdiag_exit);
792 MODULE_LICENSE("GPL");