2 * inet_diag.c Module for monitoring INET transport protocols sockets.
4 * Version: $Id: inet_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>
37 static const struct inet_diag_handler **inet_diag_table;
39 struct inet_diag_entry {
48 static struct sock *idiagnl;
50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
53 static int inet_diag_fill(struct sk_buff *skb, struct sock *sk,
54 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
55 const struct nlmsghdr *unlh)
57 const struct inet_sock *inet = inet_sk(sk);
58 const struct inet_connection_sock *icsk = inet_csk(sk);
59 struct inet_diag_msg *r;
62 struct inet_diag_meminfo *minfo = NULL;
63 unsigned char *b = skb->tail;
64 const struct inet_diag_handler *handler;
66 handler = inet_diag_table[unlh->nlmsg_type];
67 BUG_ON(handler == NULL);
69 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
70 nlh->nlmsg_flags = nlmsg_flags;
73 if (sk->sk_state != TCP_TIME_WAIT) {
74 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
75 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO,
77 if (ext & (1 << (INET_DIAG_INFO - 1)))
78 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
79 handler->idiag_info_size);
81 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
82 size_t len = strlen(icsk->icsk_ca_ops->name);
83 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
84 icsk->icsk_ca_ops->name);
87 r->idiag_family = sk->sk_family;
88 r->idiag_state = sk->sk_state;
92 r->id.idiag_if = sk->sk_bound_dev_if;
93 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
94 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
96 if (r->idiag_state == TCP_TIME_WAIT) {
97 const struct inet_timewait_sock *tw = inet_twsk(sk);
98 long tmo = tw->tw_ttd - jiffies;
102 r->id.idiag_sport = tw->tw_sport;
103 r->id.idiag_dport = tw->tw_dport;
104 r->id.idiag_src[0] = tw->tw_rcv_saddr;
105 r->id.idiag_dst[0] = tw->tw_daddr;
106 r->idiag_state = tw->tw_substate;
108 r->idiag_expires = (tmo * 1000 + HZ - 1) / HZ;
113 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
114 if (r->idiag_family == AF_INET6) {
115 const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
117 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
118 &tcp6tw->tw_v6_rcv_saddr);
119 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
120 &tcp6tw->tw_v6_daddr);
123 nlh->nlmsg_len = skb->tail - b;
127 r->id.idiag_sport = inet->sport;
128 r->id.idiag_dport = inet->dport;
129 r->id.idiag_src[0] = inet->rcv_saddr;
130 r->id.idiag_dst[0] = inet->daddr;
132 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
133 if (r->idiag_family == AF_INET6) {
134 struct ipv6_pinfo *np = inet6_sk(sk);
136 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
138 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
143 #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ
145 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
147 r->idiag_retrans = icsk->icsk_retransmits;
148 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
149 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
151 r->idiag_retrans = icsk->icsk_probes_out;
152 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
153 } else if (timer_pending(&sk->sk_timer)) {
155 r->idiag_retrans = icsk->icsk_probes_out;
156 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
159 r->idiag_expires = 0;
163 r->idiag_uid = sock_i_uid(sk);
164 r->idiag_inode = sock_i_ino(sk);
167 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
168 minfo->idiag_wmem = sk->sk_wmem_queued;
169 minfo->idiag_fmem = sk->sk_forward_alloc;
170 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
173 handler->idiag_get_info(sk, r, info);
175 if (sk->sk_state < TCP_TIME_WAIT &&
176 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
177 icsk->icsk_ca_ops->get_info(sk, ext, skb);
179 nlh->nlmsg_len = skb->tail - b;
184 skb_trim(skb, b - skb->data);
188 static int inet_diag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
192 struct inet_diag_req *req = NLMSG_DATA(nlh);
194 struct inet_hashinfo *hashinfo;
195 const struct inet_diag_handler *handler;
197 handler = inet_diag_table[nlh->nlmsg_type];
198 BUG_ON(handler == NULL);
199 hashinfo = handler->idiag_hashinfo;
201 if (req->idiag_family == AF_INET) {
202 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
203 req->id.idiag_dport, req->id.idiag_src[0],
204 req->id.idiag_sport, req->id.idiag_if);
206 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
207 else if (req->idiag_family == AF_INET6) {
208 sk = inet6_lookup(hashinfo,
209 (struct in6_addr *)req->id.idiag_dst,
211 (struct in6_addr *)req->id.idiag_src,
224 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
225 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
226 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
227 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
231 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
232 sizeof(struct inet_diag_meminfo) +
233 handler->idiag_info_size + 64)),
238 if (inet_diag_fill(rep, sk, req->idiag_ext,
239 NETLINK_CB(in_skb).pid,
240 nlh->nlmsg_seq, 0, nlh) <= 0)
243 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
250 if (sk->sk_state == TCP_TIME_WAIT)
251 inet_twsk_put((struct inet_timewait_sock *)sk);
258 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
260 int words = bits >> 5;
265 if (memcmp(a1, a2, words << 2))
275 mask = htonl((0xffffffff) << (32 - bits));
277 if ((w1 ^ w2) & mask)
285 static int inet_diag_bc_run(const void *bc, int len,
286 const struct inet_diag_entry *entry)
290 const struct inet_diag_bc_op *op = bc;
293 case INET_DIAG_BC_NOP:
295 case INET_DIAG_BC_JMP:
298 case INET_DIAG_BC_S_GE:
299 yes = entry->sport >= op[1].no;
301 case INET_DIAG_BC_S_LE:
302 yes = entry->dport <= op[1].no;
304 case INET_DIAG_BC_D_GE:
305 yes = entry->dport >= op[1].no;
307 case INET_DIAG_BC_D_LE:
308 yes = entry->dport <= op[1].no;
310 case INET_DIAG_BC_AUTO:
311 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
313 case INET_DIAG_BC_S_COND:
314 case INET_DIAG_BC_D_COND:
316 struct inet_diag_hostcond *cond = (struct inet_diag_hostcond*)(op+1);
319 if (cond->port != -1 &&
320 cond->port != (op->code == INET_DIAG_BC_S_COND ?
321 entry->sport : entry->dport)) {
326 if (cond->prefix_len == 0)
329 if (op->code == INET_DIAG_BC_S_COND)
334 if (bitstring_match(addr, cond->addr, cond->prefix_len))
336 if (entry->family == AF_INET6 &&
337 cond->family == AF_INET) {
338 if (addr[0] == 0 && addr[1] == 0 &&
339 addr[2] == htonl(0xffff) &&
340 bitstring_match(addr+3, cond->addr, cond->prefix_len))
359 static int valid_cc(const void *bc, int len, int cc)
362 const struct inet_diag_bc_op *op = bc;
376 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
378 const unsigned char *bc = bytecode;
379 int len = bytecode_len;
382 struct inet_diag_bc_op *op = (struct inet_diag_bc_op*)bc;
384 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
386 case INET_DIAG_BC_AUTO:
387 case INET_DIAG_BC_S_COND:
388 case INET_DIAG_BC_D_COND:
389 case INET_DIAG_BC_S_GE:
390 case INET_DIAG_BC_S_LE:
391 case INET_DIAG_BC_D_GE:
392 case INET_DIAG_BC_D_LE:
393 if (op->yes < 4 || op->yes > len+4)
395 case INET_DIAG_BC_JMP:
396 if (op->no < 4 || op->no > len+4)
399 !valid_cc(bytecode, bytecode_len, len-op->no))
402 case INET_DIAG_BC_NOP:
403 if (op->yes < 4 || op->yes > len+4)
412 return len == 0 ? 0 : -EINVAL;
415 static int inet_diag_dump_sock(struct sk_buff *skb, struct sock *sk,
416 struct netlink_callback *cb)
418 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
420 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
421 struct inet_diag_entry entry;
422 struct rtattr *bc = (struct rtattr *)(r + 1);
423 struct inet_sock *inet = inet_sk(sk);
425 entry.family = sk->sk_family;
426 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
427 if (entry.family == AF_INET6) {
428 struct ipv6_pinfo *np = inet6_sk(sk);
430 entry.saddr = np->rcv_saddr.s6_addr32;
431 entry.daddr = np->daddr.s6_addr32;
435 entry.saddr = &inet->rcv_saddr;
436 entry.daddr = &inet->daddr;
438 entry.sport = inet->num;
439 entry.dport = ntohs(inet->dport);
440 entry.userlocks = sk->sk_userlocks;
442 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
446 return inet_diag_fill(skb, sk, r->idiag_ext, NETLINK_CB(cb->skb).pid,
447 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
450 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
451 struct request_sock *req,
453 const struct nlmsghdr *unlh)
455 const struct inet_request_sock *ireq = inet_rsk(req);
456 struct inet_sock *inet = inet_sk(sk);
457 unsigned char *b = skb->tail;
458 struct inet_diag_msg *r;
459 struct nlmsghdr *nlh;
462 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
463 nlh->nlmsg_flags = NLM_F_MULTI;
466 r->idiag_family = sk->sk_family;
467 r->idiag_state = TCP_SYN_RECV;
469 r->idiag_retrans = req->retrans;
471 r->id.idiag_if = sk->sk_bound_dev_if;
472 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
473 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
475 tmo = req->expires - jiffies;
479 r->id.idiag_sport = inet->sport;
480 r->id.idiag_dport = ireq->rmt_port;
481 r->id.idiag_src[0] = ireq->loc_addr;
482 r->id.idiag_dst[0] = ireq->rmt_addr;
483 r->idiag_expires = jiffies_to_msecs(tmo);
486 r->idiag_uid = sock_i_uid(sk);
488 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
489 if (r->idiag_family == AF_INET6) {
490 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
491 &tcp6_rsk(req)->loc_addr);
492 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
493 &tcp6_rsk(req)->rmt_addr);
496 nlh->nlmsg_len = skb->tail - b;
501 skb_trim(skb, b - skb->data);
505 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
506 struct netlink_callback *cb)
508 struct inet_diag_entry entry;
509 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
510 struct inet_connection_sock *icsk = inet_csk(sk);
511 struct listen_sock *lopt;
512 struct rtattr *bc = NULL;
513 struct inet_sock *inet = inet_sk(sk);
515 int reqnum, s_reqnum;
519 s_reqnum = cb->args[4];
524 entry.family = sk->sk_family;
526 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
528 lopt = icsk->icsk_accept_queue.listen_opt;
529 if (!lopt || !lopt->qlen)
532 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
533 bc = (struct rtattr *)(r + 1);
534 entry.sport = inet->num;
535 entry.userlocks = sk->sk_userlocks;
538 for (j = s_j; j < lopt->nr_table_entries; j++) {
539 struct request_sock *req, *head = lopt->syn_table[j];
542 for (req = head; req; reqnum++, req = req->dl_next) {
543 struct inet_request_sock *ireq = inet_rsk(req);
545 if (reqnum < s_reqnum)
547 if (r->id.idiag_dport != ireq->rmt_port &&
553 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
554 (entry.family == AF_INET6) ?
555 tcp6_rsk(req)->loc_addr.s6_addr32 :
559 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
560 (entry.family == AF_INET6) ?
561 tcp6_rsk(req)->rmt_addr.s6_addr32 :
564 entry.dport = ntohs(ireq->rmt_port);
566 if (!inet_diag_bc_run(RTA_DATA(bc),
567 RTA_PAYLOAD(bc), &entry))
571 err = inet_diag_fill_req(skb, sk, req,
572 NETLINK_CB(cb->skb).pid,
573 cb->nlh->nlmsg_seq, cb->nlh);
576 cb->args[4] = reqnum;
585 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
590 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
594 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
595 const struct inet_diag_handler *handler;
596 struct inet_hashinfo *hashinfo;
598 handler = inet_diag_table[cb->nlh->nlmsg_type];
599 BUG_ON(handler == NULL);
600 hashinfo = handler->idiag_hashinfo;
603 s_num = num = cb->args[2];
605 if (cb->args[0] == 0) {
606 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
609 inet_listen_lock(hashinfo);
610 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
612 struct hlist_node *node;
615 sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
616 struct inet_sock *inet = inet_sk(sk);
623 if (r->id.idiag_sport != inet->sport &&
627 if (!(r->idiag_states & TCPF_LISTEN) ||
632 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
633 inet_listen_unlock(hashinfo);
638 if (!(r->idiag_states & TCPF_SYN_RECV))
641 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
642 inet_listen_unlock(hashinfo);
656 inet_listen_unlock(hashinfo);
659 s_i = num = s_num = 0;
662 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
665 for (i = s_i; i < hashinfo->ehash_size; i++) {
666 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
668 struct hlist_node *node;
673 read_lock_bh(&head->lock);
676 sk_for_each(sk, node, &head->chain) {
677 struct inet_sock *inet = inet_sk(sk);
681 if (!(r->idiag_states & (1 << sk->sk_state)))
683 if (r->id.idiag_sport != inet->sport &&
686 if (r->id.idiag_dport != inet->dport && r->id.idiag_dport)
688 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
689 read_unlock_bh(&head->lock);
696 if (r->idiag_states & TCPF_TIME_WAIT) {
697 sk_for_each(sk, node,
698 &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
699 struct inet_sock *inet = inet_sk(sk);
703 if (r->id.idiag_sport != inet->sport &&
706 if (r->id.idiag_dport != inet->dport &&
709 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
710 read_unlock_bh(&head->lock);
717 read_unlock_bh(&head->lock);
726 static int inet_diag_dump_done(struct netlink_callback *cb)
732 static __inline__ int
733 inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
735 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
738 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
741 if (inet_diag_table[nlh->nlmsg_type] == NULL)
744 if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
747 if (nlh->nlmsg_flags&NLM_F_DUMP) {
749 (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
750 struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
751 sizeof(struct inet_diag_req));
752 if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
756 NLMSG_SPACE(sizeof(struct inet_diag_req))))
758 if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
761 return netlink_dump_start(idiagnl, skb, nlh,
763 inet_diag_dump_done);
765 return inet_diag_get_exact(skb, nlh);
773 static inline void inet_diag_rcv_skb(struct sk_buff *skb)
776 struct nlmsghdr * nlh;
778 if (skb->len >= NLMSG_SPACE(0)) {
779 nlh = (struct nlmsghdr *)skb->data;
780 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
782 err = inet_diag_rcv_msg(skb, nlh);
783 if (err || nlh->nlmsg_flags & NLM_F_ACK)
784 netlink_ack(skb, nlh, err);
788 static void inet_diag_rcv(struct sock *sk, int len)
791 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
793 while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
794 inet_diag_rcv_skb(skb);
799 static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
802 const struct tcp_sock *tp = tcp_sk(sk);
803 struct tcp_info *info = _info;
805 r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq;
806 r->idiag_wqueue = tp->write_seq - tp->snd_una;
808 tcp_get_info(sk, info);
811 static struct inet_diag_handler tcp_diag_handler = {
812 .idiag_hashinfo = &tcp_hashinfo,
813 .idiag_get_info = tcp_diag_get_info,
814 .idiag_type = TCPDIAG_GETSOCK,
815 .idiag_info_size = sizeof(struct tcp_info),
818 static DEFINE_SPINLOCK(inet_diag_register_lock);
820 int inet_diag_register(const struct inet_diag_handler *h)
822 const __u16 type = h->idiag_type;
825 if (type >= INET_DIAG_GETSOCK_MAX)
828 spin_lock(&inet_diag_register_lock);
830 if (inet_diag_table[type] == NULL) {
831 inet_diag_table[type] = h;
834 spin_unlock(&inet_diag_register_lock);
838 EXPORT_SYMBOL_GPL(inet_diag_register);
840 void inet_diag_unregister(const struct inet_diag_handler *h)
842 const __u16 type = h->idiag_type;
844 if (type >= INET_DIAG_GETSOCK_MAX)
847 spin_lock(&inet_diag_register_lock);
848 inet_diag_table[type] = NULL;
849 spin_unlock(&inet_diag_register_lock);
853 EXPORT_SYMBOL_GPL(inet_diag_unregister);
855 static int __init inet_diag_init(void)
857 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
858 sizeof(struct inet_diag_handler *));
861 inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL);
862 if (!inet_diag_table)
865 memset(inet_diag_table, 0, inet_diag_table_size);
867 idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, inet_diag_rcv,
872 err = inet_diag_register(&tcp_diag_handler);
874 goto out_sock_release;
878 sock_release(idiagnl->sk_socket);
880 kfree(inet_diag_table);
884 static void __exit inet_diag_exit(void)
886 sock_release(idiagnl->sk_socket);
887 kfree(inet_diag_table);
890 module_init(inet_diag_init);
891 module_exit(inet_diag_exit);
892 MODULE_LICENSE("GPL");