2 * inet_diag.c Module for monitoring INET transport protocols sockets.
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
35 #include <linux/inet_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 DEFINE_MUTEX(inet_diag_table_mutex);
55 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
57 if (!inet_diag_table[type])
58 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
59 NETLINK_INET_DIAG, type);
61 mutex_lock(&inet_diag_table_mutex);
62 if (!inet_diag_table[type])
63 return ERR_PTR(-ENOENT);
65 return inet_diag_table[type];
68 static inline void inet_diag_unlock_handler(
69 const struct inet_diag_handler *handler)
71 mutex_unlock(&inet_diag_table_mutex);
74 static int inet_csk_diag_fill(struct sock *sk,
76 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
77 const struct nlmsghdr *unlh)
79 const struct inet_sock *inet = inet_sk(sk);
80 const struct inet_connection_sock *icsk = inet_csk(sk);
81 struct inet_diag_msg *r;
84 struct inet_diag_meminfo *minfo = NULL;
85 unsigned char *b = skb_tail_pointer(skb);
86 const struct inet_diag_handler *handler;
88 handler = inet_diag_table[unlh->nlmsg_type];
89 BUG_ON(handler == NULL);
91 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
92 nlh->nlmsg_flags = nlmsg_flags;
95 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
97 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
98 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
100 if (ext & (1 << (INET_DIAG_INFO - 1)))
101 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
102 handler->idiag_info_size);
104 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
105 const size_t len = strlen(icsk->icsk_ca_ops->name);
107 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
108 icsk->icsk_ca_ops->name);
111 if ((ext & (1 << (INET_DIAG_TOS - 1))) && (sk->sk_family != AF_INET6))
112 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
114 r->idiag_family = sk->sk_family;
115 r->idiag_state = sk->sk_state;
117 r->idiag_retrans = 0;
119 r->id.idiag_if = sk->sk_bound_dev_if;
120 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
121 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
123 r->id.idiag_sport = inet->inet_sport;
124 r->id.idiag_dport = inet->inet_dport;
125 r->id.idiag_src[0] = inet->inet_rcv_saddr;
126 r->id.idiag_dst[0] = inet->inet_daddr;
128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
129 if (r->idiag_family == AF_INET6) {
130 const struct ipv6_pinfo *np = inet6_sk(sk);
132 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
134 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
136 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
137 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
141 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
143 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
145 r->idiag_retrans = icsk->icsk_retransmits;
146 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
147 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
149 r->idiag_retrans = icsk->icsk_probes_out;
150 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
151 } else if (timer_pending(&sk->sk_timer)) {
153 r->idiag_retrans = icsk->icsk_probes_out;
154 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
157 r->idiag_expires = 0;
161 r->idiag_uid = sock_i_uid(sk);
162 r->idiag_inode = sock_i_ino(sk);
165 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
166 minfo->idiag_wmem = sk->sk_wmem_queued;
167 minfo->idiag_fmem = sk->sk_forward_alloc;
168 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
171 handler->idiag_get_info(sk, r, info);
173 if (sk->sk_state < TCP_TIME_WAIT &&
174 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
175 icsk->icsk_ca_ops->get_info(sk, ext, skb);
177 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
186 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
187 struct sk_buff *skb, int ext, u32 pid,
188 u32 seq, u16 nlmsg_flags,
189 const struct nlmsghdr *unlh)
192 struct inet_diag_msg *r;
193 const unsigned char *previous_tail = skb_tail_pointer(skb);
194 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
195 unlh->nlmsg_type, sizeof(*r));
198 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
200 nlh->nlmsg_flags = nlmsg_flags;
202 tmo = tw->tw_ttd - jiffies;
206 r->idiag_family = tw->tw_family;
207 r->idiag_retrans = 0;
208 r->id.idiag_if = tw->tw_bound_dev_if;
209 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
210 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
211 r->id.idiag_sport = tw->tw_sport;
212 r->id.idiag_dport = tw->tw_dport;
213 r->id.idiag_src[0] = tw->tw_rcv_saddr;
214 r->id.idiag_dst[0] = tw->tw_daddr;
215 r->idiag_state = tw->tw_substate;
217 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
222 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
223 if (tw->tw_family == AF_INET6) {
224 const struct inet6_timewait_sock *tw6 =
225 inet6_twsk((struct sock *)tw);
227 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
228 &tw6->tw_v6_rcv_saddr);
229 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
233 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
236 nlmsg_trim(skb, previous_tail);
240 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
241 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
242 const struct nlmsghdr *unlh)
244 if (sk->sk_state == TCP_TIME_WAIT)
245 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
246 skb, ext, pid, seq, nlmsg_flags,
248 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
251 static int inet_diag_get_exact(struct sk_buff *in_skb,
252 const struct nlmsghdr *nlh)
256 struct inet_diag_req *req = NLMSG_DATA(nlh);
258 struct inet_hashinfo *hashinfo;
259 const struct inet_diag_handler *handler;
261 handler = inet_diag_lock_handler(nlh->nlmsg_type);
262 if (IS_ERR(handler)) {
263 err = PTR_ERR(handler);
267 hashinfo = handler->idiag_hashinfo;
270 if (req->idiag_family == AF_INET) {
271 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
272 req->id.idiag_dport, req->id.idiag_src[0],
273 req->id.idiag_sport, req->id.idiag_if);
275 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
276 else if (req->idiag_family == AF_INET6) {
277 sk = inet6_lookup(&init_net, hashinfo,
278 (struct in6_addr *)req->id.idiag_dst,
280 (struct in6_addr *)req->id.idiag_src,
294 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
295 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
296 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
297 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
301 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
302 sizeof(struct inet_diag_meminfo) +
303 handler->idiag_info_size + 64)),
308 err = sk_diag_fill(sk, rep, req->idiag_ext,
309 NETLINK_CB(in_skb).pid,
310 nlh->nlmsg_seq, 0, nlh);
312 WARN_ON(err == -EMSGSIZE);
316 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
323 if (sk->sk_state == TCP_TIME_WAIT)
324 inet_twsk_put((struct inet_timewait_sock *)sk);
329 inet_diag_unlock_handler(handler);
333 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
335 int words = bits >> 5;
340 if (memcmp(a1, a2, words << 2))
350 mask = htonl((0xffffffff) << (32 - bits));
352 if ((w1 ^ w2) & mask)
360 static int inet_diag_bc_run(const void *bc, int len,
361 const struct inet_diag_entry *entry)
365 const struct inet_diag_bc_op *op = bc;
368 case INET_DIAG_BC_NOP:
370 case INET_DIAG_BC_JMP:
373 case INET_DIAG_BC_S_GE:
374 yes = entry->sport >= op[1].no;
376 case INET_DIAG_BC_S_LE:
377 yes = entry->sport <= op[1].no;
379 case INET_DIAG_BC_D_GE:
380 yes = entry->dport >= op[1].no;
382 case INET_DIAG_BC_D_LE:
383 yes = entry->dport <= op[1].no;
385 case INET_DIAG_BC_AUTO:
386 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
388 case INET_DIAG_BC_S_COND:
389 case INET_DIAG_BC_D_COND: {
390 struct inet_diag_hostcond *cond;
393 cond = (struct inet_diag_hostcond *)(op + 1);
394 if (cond->port != -1 &&
395 cond->port != (op->code == INET_DIAG_BC_S_COND ?
396 entry->sport : entry->dport)) {
401 if (cond->prefix_len == 0)
404 if (op->code == INET_DIAG_BC_S_COND)
409 if (bitstring_match(addr, cond->addr,
412 if (entry->family == AF_INET6 &&
413 cond->family == AF_INET) {
414 if (addr[0] == 0 && addr[1] == 0 &&
415 addr[2] == htonl(0xffff) &&
416 bitstring_match(addr + 3, cond->addr,
436 static int valid_cc(const void *bc, int len, int cc)
439 const struct inet_diag_bc_op *op = bc;
445 if (op->yes < 4 || op->yes & 3)
453 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
455 const void *bc = bytecode;
456 int len = bytecode_len;
459 const struct inet_diag_bc_op *op = bc;
461 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
463 case INET_DIAG_BC_AUTO:
464 case INET_DIAG_BC_S_COND:
465 case INET_DIAG_BC_D_COND:
466 case INET_DIAG_BC_S_GE:
467 case INET_DIAG_BC_S_LE:
468 case INET_DIAG_BC_D_GE:
469 case INET_DIAG_BC_D_LE:
470 case INET_DIAG_BC_JMP:
471 if (op->no < 4 || op->no > len + 4 || op->no & 3)
474 !valid_cc(bytecode, bytecode_len, len - op->no))
477 case INET_DIAG_BC_NOP:
482 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
487 return len == 0 ? 0 : -EINVAL;
490 static int inet_csk_diag_dump(struct sock *sk,
492 struct netlink_callback *cb)
494 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
496 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
497 struct inet_diag_entry entry;
498 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
500 INET_DIAG_REQ_BYTECODE);
501 struct inet_sock *inet = inet_sk(sk);
503 entry.family = sk->sk_family;
504 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
505 if (entry.family == AF_INET6) {
506 struct ipv6_pinfo *np = inet6_sk(sk);
508 entry.saddr = np->rcv_saddr.s6_addr32;
509 entry.daddr = np->daddr.s6_addr32;
513 entry.saddr = &inet->inet_rcv_saddr;
514 entry.daddr = &inet->inet_daddr;
516 entry.sport = inet->inet_num;
517 entry.dport = ntohs(inet->inet_dport);
518 entry.userlocks = sk->sk_userlocks;
520 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
524 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
525 NETLINK_CB(cb->skb).pid,
526 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
529 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
531 struct netlink_callback *cb)
533 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
535 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
536 struct inet_diag_entry entry;
537 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
539 INET_DIAG_REQ_BYTECODE);
541 entry.family = tw->tw_family;
542 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
543 if (tw->tw_family == AF_INET6) {
544 struct inet6_timewait_sock *tw6 =
545 inet6_twsk((struct sock *)tw);
546 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
547 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
551 entry.saddr = &tw->tw_rcv_saddr;
552 entry.daddr = &tw->tw_daddr;
554 entry.sport = tw->tw_num;
555 entry.dport = ntohs(tw->tw_dport);
558 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
562 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
563 NETLINK_CB(cb->skb).pid,
564 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
567 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
568 struct request_sock *req, u32 pid, u32 seq,
569 const struct nlmsghdr *unlh)
571 const struct inet_request_sock *ireq = inet_rsk(req);
572 struct inet_sock *inet = inet_sk(sk);
573 unsigned char *b = skb_tail_pointer(skb);
574 struct inet_diag_msg *r;
575 struct nlmsghdr *nlh;
578 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
579 nlh->nlmsg_flags = NLM_F_MULTI;
582 r->idiag_family = sk->sk_family;
583 r->idiag_state = TCP_SYN_RECV;
585 r->idiag_retrans = req->retrans;
587 r->id.idiag_if = sk->sk_bound_dev_if;
588 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
589 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
591 tmo = req->expires - jiffies;
595 r->id.idiag_sport = inet->inet_sport;
596 r->id.idiag_dport = ireq->rmt_port;
597 r->id.idiag_src[0] = ireq->loc_addr;
598 r->id.idiag_dst[0] = ireq->rmt_addr;
599 r->idiag_expires = jiffies_to_msecs(tmo);
602 r->idiag_uid = sock_i_uid(sk);
604 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
605 if (r->idiag_family == AF_INET6) {
606 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
607 &inet6_rsk(req)->loc_addr);
608 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
609 &inet6_rsk(req)->rmt_addr);
612 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
621 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
622 struct netlink_callback *cb)
624 struct inet_diag_entry entry;
625 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
626 struct inet_connection_sock *icsk = inet_csk(sk);
627 struct listen_sock *lopt;
628 const struct nlattr *bc = NULL;
629 struct inet_sock *inet = inet_sk(sk);
631 int reqnum, s_reqnum;
635 s_reqnum = cb->args[4];
640 entry.family = sk->sk_family;
642 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
644 lopt = icsk->icsk_accept_queue.listen_opt;
645 if (!lopt || !lopt->qlen)
648 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
649 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
650 INET_DIAG_REQ_BYTECODE);
651 entry.sport = inet->inet_num;
652 entry.userlocks = sk->sk_userlocks;
655 for (j = s_j; j < lopt->nr_table_entries; j++) {
656 struct request_sock *req, *head = lopt->syn_table[j];
659 for (req = head; req; reqnum++, req = req->dl_next) {
660 struct inet_request_sock *ireq = inet_rsk(req);
662 if (reqnum < s_reqnum)
664 if (r->id.idiag_dport != ireq->rmt_port &&
670 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
671 (entry.family == AF_INET6) ?
672 inet6_rsk(req)->loc_addr.s6_addr32 :
676 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
677 (entry.family == AF_INET6) ?
678 inet6_rsk(req)->rmt_addr.s6_addr32 :
681 entry.dport = ntohs(ireq->rmt_port);
683 if (!inet_diag_bc_run(nla_data(bc),
684 nla_len(bc), &entry))
688 err = inet_diag_fill_req(skb, sk, req,
689 NETLINK_CB(cb->skb).pid,
690 cb->nlh->nlmsg_seq, cb->nlh);
693 cb->args[4] = reqnum;
702 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
707 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
711 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
712 const struct inet_diag_handler *handler;
713 struct inet_hashinfo *hashinfo;
715 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
719 hashinfo = handler->idiag_hashinfo;
722 s_num = num = cb->args[2];
724 if (cb->args[0] == 0) {
725 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
728 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
730 struct hlist_nulls_node *node;
731 struct inet_listen_hashbucket *ilb;
734 ilb = &hashinfo->listening_hash[i];
735 spin_lock_bh(&ilb->lock);
736 sk_nulls_for_each(sk, node, &ilb->head) {
737 struct inet_sock *inet = inet_sk(sk);
744 if (r->id.idiag_sport != inet->inet_sport &&
748 if (!(r->idiag_states & TCPF_LISTEN) ||
753 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
754 spin_unlock_bh(&ilb->lock);
759 if (!(r->idiag_states & TCPF_SYN_RECV))
762 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
763 spin_unlock_bh(&ilb->lock);
772 spin_unlock_bh(&ilb->lock);
780 s_i = num = s_num = 0;
783 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
786 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
787 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
788 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
790 struct hlist_nulls_node *node;
794 if (hlist_nulls_empty(&head->chain) &&
795 hlist_nulls_empty(&head->twchain))
802 sk_nulls_for_each(sk, node, &head->chain) {
803 struct inet_sock *inet = inet_sk(sk);
807 if (!(r->idiag_states & (1 << sk->sk_state)))
809 if (r->id.idiag_sport != inet->inet_sport &&
812 if (r->id.idiag_dport != inet->inet_dport &&
815 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
816 spin_unlock_bh(lock);
823 if (r->idiag_states & TCPF_TIME_WAIT) {
824 struct inet_timewait_sock *tw;
826 inet_twsk_for_each(tw, node,
831 if (r->id.idiag_sport != tw->tw_sport &&
834 if (r->id.idiag_dport != tw->tw_dport &&
837 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
838 spin_unlock_bh(lock);
845 spin_unlock_bh(lock);
852 inet_diag_unlock_handler(handler);
856 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
858 int hdrlen = sizeof(struct inet_diag_req);
860 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
861 nlmsg_len(nlh) < hdrlen)
864 if (nlh->nlmsg_flags & NLM_F_DUMP) {
865 if (nlmsg_attrlen(nlh, hdrlen)) {
868 attr = nlmsg_find_attr(nlh, hdrlen,
869 INET_DIAG_REQ_BYTECODE);
871 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
872 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
876 return netlink_dump_start(idiagnl, skb, nlh,
877 inet_diag_dump, NULL, 0);
880 return inet_diag_get_exact(skb, nlh);
883 static DEFINE_MUTEX(inet_diag_mutex);
885 static void inet_diag_rcv(struct sk_buff *skb)
887 mutex_lock(&inet_diag_mutex);
888 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
889 mutex_unlock(&inet_diag_mutex);
892 int inet_diag_register(const struct inet_diag_handler *h)
894 const __u16 type = h->idiag_type;
897 if (type >= INET_DIAG_GETSOCK_MAX)
900 mutex_lock(&inet_diag_table_mutex);
902 if (inet_diag_table[type] == NULL) {
903 inet_diag_table[type] = h;
906 mutex_unlock(&inet_diag_table_mutex);
910 EXPORT_SYMBOL_GPL(inet_diag_register);
912 void inet_diag_unregister(const struct inet_diag_handler *h)
914 const __u16 type = h->idiag_type;
916 if (type >= INET_DIAG_GETSOCK_MAX)
919 mutex_lock(&inet_diag_table_mutex);
920 inet_diag_table[type] = NULL;
921 mutex_unlock(&inet_diag_table_mutex);
923 EXPORT_SYMBOL_GPL(inet_diag_unregister);
925 static int __init inet_diag_init(void)
927 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
928 sizeof(struct inet_diag_handler *));
931 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
932 if (!inet_diag_table)
935 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
936 inet_diag_rcv, NULL, THIS_MODULE);
943 kfree(inet_diag_table);
947 static void __exit inet_diag_exit(void)
949 netlink_kernel_release(idiagnl);
950 kfree(inet_diag_table);
953 module_init(inet_diag_init);
954 module_exit(inet_diag_exit);
955 MODULE_LICENSE("GPL");
956 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);