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/cache.h>
18 #include <linux/init.h>
19 #include <linux/time.h>
24 #include <net/inet_common.h>
25 #include <net/inet_connection_sock.h>
26 #include <net/inet_hashtables.h>
27 #include <net/inet_timewait_sock.h>
28 #include <net/inet6_hashtables.h>
29 #include <net/netlink.h>
31 #include <linux/inet.h>
32 #include <linux/stddef.h>
34 #include <linux/inet_diag.h>
36 static const struct inet_diag_handler **inet_diag_table;
38 struct inet_diag_entry {
47 static struct sock *idiagnl;
49 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
52 static DEFINE_MUTEX(inet_diag_table_mutex);
54 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
56 if (!inet_diag_table[type])
57 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
58 NETLINK_INET_DIAG, type);
60 mutex_lock(&inet_diag_table_mutex);
61 if (!inet_diag_table[type])
62 return ERR_PTR(-ENOENT);
64 return inet_diag_table[type];
67 static inline void inet_diag_unlock_handler(
68 const struct inet_diag_handler *handler)
70 mutex_unlock(&inet_diag_table_mutex);
73 static int inet_csk_diag_fill(struct sock *sk,
75 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
76 const struct nlmsghdr *unlh)
78 const struct inet_sock *inet = inet_sk(sk);
79 const struct inet_connection_sock *icsk = inet_csk(sk);
80 struct inet_diag_msg *r;
83 struct inet_diag_meminfo *minfo = NULL;
84 unsigned char *b = skb_tail_pointer(skb);
85 const struct inet_diag_handler *handler;
87 handler = inet_diag_table[unlh->nlmsg_type];
88 BUG_ON(handler == NULL);
90 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
91 nlh->nlmsg_flags = nlmsg_flags;
94 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
96 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
97 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
99 if (ext & (1 << (INET_DIAG_INFO - 1)))
100 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
101 handler->idiag_info_size);
103 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
104 const size_t len = strlen(icsk->icsk_ca_ops->name);
106 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
107 icsk->icsk_ca_ops->name);
110 r->idiag_family = sk->sk_family;
111 r->idiag_state = sk->sk_state;
113 r->idiag_retrans = 0;
115 r->id.idiag_if = sk->sk_bound_dev_if;
116 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
117 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
119 r->id.idiag_sport = inet->sport;
120 r->id.idiag_dport = inet->dport;
121 r->id.idiag_src[0] = inet->rcv_saddr;
122 r->id.idiag_dst[0] = inet->daddr;
124 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
125 if (r->idiag_family == AF_INET6) {
126 struct ipv6_pinfo *np = inet6_sk(sk);
128 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
130 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
135 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
137 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
139 r->idiag_retrans = icsk->icsk_retransmits;
140 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
141 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
143 r->idiag_retrans = icsk->icsk_probes_out;
144 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
145 } else if (timer_pending(&sk->sk_timer)) {
147 r->idiag_retrans = icsk->icsk_probes_out;
148 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
151 r->idiag_expires = 0;
155 r->idiag_uid = sock_i_uid(sk);
156 r->idiag_inode = sock_i_ino(sk);
159 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
160 minfo->idiag_wmem = sk->sk_wmem_queued;
161 minfo->idiag_fmem = sk->sk_forward_alloc;
162 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
165 handler->idiag_get_info(sk, r, info);
167 if (sk->sk_state < TCP_TIME_WAIT &&
168 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
169 icsk->icsk_ca_ops->get_info(sk, ext, skb);
171 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
180 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
181 struct sk_buff *skb, int ext, u32 pid,
182 u32 seq, u16 nlmsg_flags,
183 const struct nlmsghdr *unlh)
186 struct inet_diag_msg *r;
187 const unsigned char *previous_tail = skb_tail_pointer(skb);
188 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
189 unlh->nlmsg_type, sizeof(*r));
192 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
194 nlh->nlmsg_flags = nlmsg_flags;
196 tmo = tw->tw_ttd - jiffies;
200 r->idiag_family = tw->tw_family;
201 r->idiag_retrans = 0;
202 r->id.idiag_if = tw->tw_bound_dev_if;
203 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
204 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
205 r->id.idiag_sport = tw->tw_sport;
206 r->id.idiag_dport = tw->tw_dport;
207 r->id.idiag_src[0] = tw->tw_rcv_saddr;
208 r->id.idiag_dst[0] = tw->tw_daddr;
209 r->idiag_state = tw->tw_substate;
211 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
216 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
217 if (tw->tw_family == AF_INET6) {
218 const struct inet6_timewait_sock *tw6 =
219 inet6_twsk((struct sock *)tw);
221 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
222 &tw6->tw_v6_rcv_saddr);
223 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
227 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
230 nlmsg_trim(skb, previous_tail);
234 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
235 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
236 const struct nlmsghdr *unlh)
238 if (sk->sk_state == TCP_TIME_WAIT)
239 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
240 skb, ext, pid, seq, nlmsg_flags,
242 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
245 static int inet_diag_get_exact(struct sk_buff *in_skb,
246 const struct nlmsghdr *nlh)
250 struct inet_diag_req *req = NLMSG_DATA(nlh);
252 struct inet_hashinfo *hashinfo;
253 const struct inet_diag_handler *handler;
255 handler = inet_diag_lock_handler(nlh->nlmsg_type);
256 if (IS_ERR(handler)) {
257 err = PTR_ERR(handler);
261 hashinfo = handler->idiag_hashinfo;
264 if (req->idiag_family == AF_INET) {
265 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
266 req->id.idiag_dport, req->id.idiag_src[0],
267 req->id.idiag_sport, req->id.idiag_if);
269 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
270 else if (req->idiag_family == AF_INET6) {
271 sk = inet6_lookup(&init_net, hashinfo,
272 (struct in6_addr *)req->id.idiag_dst,
274 (struct in6_addr *)req->id.idiag_src,
288 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
289 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
290 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
291 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
295 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
296 sizeof(struct inet_diag_meminfo) +
297 handler->idiag_info_size + 64)),
302 err = sk_diag_fill(sk, rep, req->idiag_ext,
303 NETLINK_CB(in_skb).pid,
304 nlh->nlmsg_seq, 0, nlh);
306 WARN_ON(err == -EMSGSIZE);
310 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
317 if (sk->sk_state == TCP_TIME_WAIT)
318 inet_twsk_put((struct inet_timewait_sock *)sk);
323 inet_diag_unlock_handler(handler);
327 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
329 int words = bits >> 5;
334 if (memcmp(a1, a2, words << 2))
344 mask = htonl((0xffffffff) << (32 - bits));
346 if ((w1 ^ w2) & mask)
354 static int inet_diag_bc_run(const void *bc, int len,
355 const struct inet_diag_entry *entry)
359 const struct inet_diag_bc_op *op = bc;
362 case INET_DIAG_BC_NOP:
364 case INET_DIAG_BC_JMP:
367 case INET_DIAG_BC_S_GE:
368 yes = entry->sport >= op[1].no;
370 case INET_DIAG_BC_S_LE:
371 yes = entry->dport <= op[1].no;
373 case INET_DIAG_BC_D_GE:
374 yes = entry->dport >= op[1].no;
376 case INET_DIAG_BC_D_LE:
377 yes = entry->dport <= op[1].no;
379 case INET_DIAG_BC_AUTO:
380 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
382 case INET_DIAG_BC_S_COND:
383 case INET_DIAG_BC_D_COND: {
384 struct inet_diag_hostcond *cond;
387 cond = (struct inet_diag_hostcond *)(op + 1);
388 if (cond->port != -1 &&
389 cond->port != (op->code == INET_DIAG_BC_S_COND ?
390 entry->sport : entry->dport)) {
395 if (cond->prefix_len == 0)
398 if (op->code == INET_DIAG_BC_S_COND)
403 if (bitstring_match(addr, cond->addr,
406 if (entry->family == AF_INET6 &&
407 cond->family == AF_INET) {
408 if (addr[0] == 0 && addr[1] == 0 &&
409 addr[2] == htonl(0xffff) &&
410 bitstring_match(addr + 3, cond->addr,
430 static int valid_cc(const void *bc, int len, int cc)
433 const struct inet_diag_bc_op *op = bc;
447 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
449 const unsigned char *bc = bytecode;
450 int len = bytecode_len;
453 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
455 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
457 case INET_DIAG_BC_AUTO:
458 case INET_DIAG_BC_S_COND:
459 case INET_DIAG_BC_D_COND:
460 case INET_DIAG_BC_S_GE:
461 case INET_DIAG_BC_S_LE:
462 case INET_DIAG_BC_D_GE:
463 case INET_DIAG_BC_D_LE:
464 if (op->yes < 4 || op->yes > len + 4)
466 case INET_DIAG_BC_JMP:
467 if (op->no < 4 || op->no > len + 4)
470 !valid_cc(bytecode, bytecode_len, len - op->no))
473 case INET_DIAG_BC_NOP:
474 if (op->yes < 4 || op->yes > len + 4)
483 return len == 0 ? 0 : -EINVAL;
486 static int inet_csk_diag_dump(struct sock *sk,
488 struct netlink_callback *cb)
490 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
492 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
493 struct inet_diag_entry entry;
494 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
496 INET_DIAG_REQ_BYTECODE);
497 struct inet_sock *inet = inet_sk(sk);
499 entry.family = sk->sk_family;
500 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
501 if (entry.family == AF_INET6) {
502 struct ipv6_pinfo *np = inet6_sk(sk);
504 entry.saddr = np->rcv_saddr.s6_addr32;
505 entry.daddr = np->daddr.s6_addr32;
509 entry.saddr = &inet->rcv_saddr;
510 entry.daddr = &inet->daddr;
512 entry.sport = inet->num;
513 entry.dport = ntohs(inet->dport);
514 entry.userlocks = sk->sk_userlocks;
516 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
520 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
521 NETLINK_CB(cb->skb).pid,
522 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
525 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
527 struct netlink_callback *cb)
529 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
531 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
532 struct inet_diag_entry entry;
533 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
535 INET_DIAG_REQ_BYTECODE);
537 entry.family = tw->tw_family;
538 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
539 if (tw->tw_family == AF_INET6) {
540 struct inet6_timewait_sock *tw6 =
541 inet6_twsk((struct sock *)tw);
542 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
543 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
547 entry.saddr = &tw->tw_rcv_saddr;
548 entry.daddr = &tw->tw_daddr;
550 entry.sport = tw->tw_num;
551 entry.dport = ntohs(tw->tw_dport);
554 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
558 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
559 NETLINK_CB(cb->skb).pid,
560 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
563 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
564 struct request_sock *req, u32 pid, u32 seq,
565 const struct nlmsghdr *unlh)
567 const struct inet_request_sock *ireq = inet_rsk(req);
568 struct inet_sock *inet = inet_sk(sk);
569 unsigned char *b = skb_tail_pointer(skb);
570 struct inet_diag_msg *r;
571 struct nlmsghdr *nlh;
574 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
575 nlh->nlmsg_flags = NLM_F_MULTI;
578 r->idiag_family = sk->sk_family;
579 r->idiag_state = TCP_SYN_RECV;
581 r->idiag_retrans = req->retrans;
583 r->id.idiag_if = sk->sk_bound_dev_if;
584 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
585 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
587 tmo = req->expires - jiffies;
591 r->id.idiag_sport = inet->sport;
592 r->id.idiag_dport = ireq->rmt_port;
593 r->id.idiag_src[0] = ireq->loc_addr;
594 r->id.idiag_dst[0] = ireq->rmt_addr;
595 r->idiag_expires = jiffies_to_msecs(tmo);
598 r->idiag_uid = sock_i_uid(sk);
600 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
601 if (r->idiag_family == AF_INET6) {
602 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
603 &inet6_rsk(req)->loc_addr);
604 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
605 &inet6_rsk(req)->rmt_addr);
608 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
617 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
618 struct netlink_callback *cb)
620 struct inet_diag_entry entry;
621 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
622 struct inet_connection_sock *icsk = inet_csk(sk);
623 struct listen_sock *lopt;
624 const struct nlattr *bc = NULL;
625 struct inet_sock *inet = inet_sk(sk);
627 int reqnum, s_reqnum;
631 s_reqnum = cb->args[4];
636 entry.family = sk->sk_family;
638 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
640 lopt = icsk->icsk_accept_queue.listen_opt;
641 if (!lopt || !lopt->qlen)
644 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
645 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
646 INET_DIAG_REQ_BYTECODE);
647 entry.sport = inet->num;
648 entry.userlocks = sk->sk_userlocks;
651 for (j = s_j; j < lopt->nr_table_entries; j++) {
652 struct request_sock *req, *head = lopt->syn_table[j];
655 for (req = head; req; reqnum++, req = req->dl_next) {
656 struct inet_request_sock *ireq = inet_rsk(req);
658 if (reqnum < s_reqnum)
660 if (r->id.idiag_dport != ireq->rmt_port &&
666 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
667 (entry.family == AF_INET6) ?
668 inet6_rsk(req)->loc_addr.s6_addr32 :
672 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
673 (entry.family == AF_INET6) ?
674 inet6_rsk(req)->rmt_addr.s6_addr32 :
677 entry.dport = ntohs(ireq->rmt_port);
679 if (!inet_diag_bc_run(nla_data(bc),
680 nla_len(bc), &entry))
684 err = inet_diag_fill_req(skb, sk, req,
685 NETLINK_CB(cb->skb).pid,
686 cb->nlh->nlmsg_seq, cb->nlh);
689 cb->args[4] = reqnum;
698 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
703 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
707 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
708 const struct inet_diag_handler *handler;
709 struct inet_hashinfo *hashinfo;
711 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
715 hashinfo = handler->idiag_hashinfo;
718 s_num = num = cb->args[2];
720 if (cb->args[0] == 0) {
721 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
724 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
726 struct hlist_nulls_node *node;
727 struct inet_listen_hashbucket *ilb;
730 ilb = &hashinfo->listening_hash[i];
731 spin_lock_bh(&ilb->lock);
732 sk_nulls_for_each(sk, node, &ilb->head) {
733 struct inet_sock *inet = inet_sk(sk);
740 if (r->id.idiag_sport != inet->sport &&
744 if (!(r->idiag_states & TCPF_LISTEN) ||
749 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
750 spin_unlock_bh(&ilb->lock);
755 if (!(r->idiag_states & TCPF_SYN_RECV))
758 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
759 spin_unlock_bh(&ilb->lock);
768 spin_unlock_bh(&ilb->lock);
776 s_i = num = s_num = 0;
779 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
782 for (i = s_i; i < hashinfo->ehash_size; i++) {
783 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
784 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
786 struct hlist_nulls_node *node;
790 if (hlist_nulls_empty(&head->chain) &&
791 hlist_nulls_empty(&head->twchain))
798 sk_nulls_for_each(sk, node, &head->chain) {
799 struct inet_sock *inet = inet_sk(sk);
803 if (!(r->idiag_states & (1 << sk->sk_state)))
805 if (r->id.idiag_sport != inet->sport &&
808 if (r->id.idiag_dport != inet->dport &&
811 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
812 spin_unlock_bh(lock);
819 if (r->idiag_states & TCPF_TIME_WAIT) {
820 struct inet_timewait_sock *tw;
822 inet_twsk_for_each(tw, node,
827 if (r->id.idiag_sport != tw->tw_sport &&
830 if (r->id.idiag_dport != tw->tw_dport &&
833 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
834 spin_unlock_bh(lock);
841 spin_unlock_bh(lock);
848 inet_diag_unlock_handler(handler);
852 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
854 int hdrlen = sizeof(struct inet_diag_req);
856 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
857 nlmsg_len(nlh) < hdrlen)
860 if (nlh->nlmsg_flags & NLM_F_DUMP) {
861 if (nlmsg_attrlen(nlh, hdrlen)) {
864 attr = nlmsg_find_attr(nlh, hdrlen,
865 INET_DIAG_REQ_BYTECODE);
867 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
868 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
872 return netlink_dump_start(idiagnl, skb, nlh,
873 inet_diag_dump, NULL);
876 return inet_diag_get_exact(skb, nlh);
879 static DEFINE_MUTEX(inet_diag_mutex);
881 static void inet_diag_rcv(struct sk_buff *skb)
883 mutex_lock(&inet_diag_mutex);
884 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
885 mutex_unlock(&inet_diag_mutex);
888 int inet_diag_register(const struct inet_diag_handler *h)
890 const __u16 type = h->idiag_type;
893 if (type >= INET_DIAG_GETSOCK_MAX)
896 mutex_lock(&inet_diag_table_mutex);
898 if (inet_diag_table[type] == NULL) {
899 inet_diag_table[type] = h;
902 mutex_unlock(&inet_diag_table_mutex);
906 EXPORT_SYMBOL_GPL(inet_diag_register);
908 void inet_diag_unregister(const struct inet_diag_handler *h)
910 const __u16 type = h->idiag_type;
912 if (type >= INET_DIAG_GETSOCK_MAX)
915 mutex_lock(&inet_diag_table_mutex);
916 inet_diag_table[type] = NULL;
917 mutex_unlock(&inet_diag_table_mutex);
919 EXPORT_SYMBOL_GPL(inet_diag_unregister);
921 static int __init inet_diag_init(void)
923 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
924 sizeof(struct inet_diag_handler *));
927 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
928 if (!inet_diag_table)
931 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
932 inet_diag_rcv, NULL, THIS_MODULE);
939 kfree(inet_diag_table);
943 static void __exit inet_diag_exit(void)
945 netlink_kernel_release(idiagnl);
946 kfree(inet_diag_table);
949 module_init(inet_diag_init);
950 module_exit(inet_diag_exit);
951 MODULE_LICENSE("GPL");
952 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);