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 r->idiag_family = sk->sk_family;
112 r->idiag_state = sk->sk_state;
114 r->idiag_retrans = 0;
116 r->id.idiag_if = sk->sk_bound_dev_if;
117 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
118 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
120 r->id.idiag_sport = inet->inet_sport;
121 r->id.idiag_dport = inet->inet_dport;
123 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
124 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
126 r->id.idiag_src[0] = inet->inet_rcv_saddr;
127 r->id.idiag_dst[0] = inet->inet_daddr;
129 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
130 * hence this needs to be included regardless of socket family.
132 if (ext & (1 << (INET_DIAG_TOS - 1)))
133 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
135 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
136 if (r->idiag_family == AF_INET6) {
137 const struct ipv6_pinfo *np = inet6_sk(sk);
139 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
140 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
142 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
144 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
149 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
151 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
153 r->idiag_retrans = icsk->icsk_retransmits;
154 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
155 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
157 r->idiag_retrans = icsk->icsk_probes_out;
158 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
159 } else if (timer_pending(&sk->sk_timer)) {
161 r->idiag_retrans = icsk->icsk_probes_out;
162 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
165 r->idiag_expires = 0;
169 r->idiag_uid = sock_i_uid(sk);
170 r->idiag_inode = sock_i_ino(sk);
173 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
174 minfo->idiag_wmem = sk->sk_wmem_queued;
175 minfo->idiag_fmem = sk->sk_forward_alloc;
176 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
179 handler->idiag_get_info(sk, r, info);
181 if (sk->sk_state < TCP_TIME_WAIT &&
182 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
183 icsk->icsk_ca_ops->get_info(sk, ext, skb);
185 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
194 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
195 struct sk_buff *skb, int ext, u32 pid,
196 u32 seq, u16 nlmsg_flags,
197 const struct nlmsghdr *unlh)
200 struct inet_diag_msg *r;
201 const unsigned char *previous_tail = skb_tail_pointer(skb);
202 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
203 unlh->nlmsg_type, sizeof(*r));
206 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
208 nlh->nlmsg_flags = nlmsg_flags;
210 tmo = tw->tw_ttd - jiffies;
214 r->idiag_family = tw->tw_family;
215 r->idiag_retrans = 0;
217 r->id.idiag_if = tw->tw_bound_dev_if;
218 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
219 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
221 r->id.idiag_sport = tw->tw_sport;
222 r->id.idiag_dport = tw->tw_dport;
224 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
225 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
227 r->id.idiag_src[0] = tw->tw_rcv_saddr;
228 r->id.idiag_dst[0] = tw->tw_daddr;
230 r->idiag_state = tw->tw_substate;
232 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
237 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
238 if (tw->tw_family == AF_INET6) {
239 const struct inet6_timewait_sock *tw6 =
240 inet6_twsk((struct sock *)tw);
242 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
243 &tw6->tw_v6_rcv_saddr);
244 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
248 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
251 nlmsg_trim(skb, previous_tail);
255 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
256 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
257 const struct nlmsghdr *unlh)
259 if (sk->sk_state == TCP_TIME_WAIT)
260 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
261 skb, ext, pid, seq, nlmsg_flags,
263 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
266 static int inet_diag_get_exact(struct sk_buff *in_skb,
267 const struct nlmsghdr *nlh)
271 struct inet_diag_req *req = NLMSG_DATA(nlh);
273 struct inet_hashinfo *hashinfo;
274 const struct inet_diag_handler *handler;
276 handler = inet_diag_lock_handler(nlh->nlmsg_type);
277 if (IS_ERR(handler)) {
278 err = PTR_ERR(handler);
282 hashinfo = handler->idiag_hashinfo;
285 if (req->idiag_family == AF_INET) {
286 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
287 req->id.idiag_dport, req->id.idiag_src[0],
288 req->id.idiag_sport, req->id.idiag_if);
290 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
291 else if (req->idiag_family == AF_INET6) {
292 sk = inet6_lookup(&init_net, hashinfo,
293 (struct in6_addr *)req->id.idiag_dst,
295 (struct in6_addr *)req->id.idiag_src,
309 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
310 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
311 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
312 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
316 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
317 sizeof(struct inet_diag_meminfo) +
318 handler->idiag_info_size + 64)),
323 err = sk_diag_fill(sk, rep, req->idiag_ext,
324 NETLINK_CB(in_skb).pid,
325 nlh->nlmsg_seq, 0, nlh);
327 WARN_ON(err == -EMSGSIZE);
331 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
338 if (sk->sk_state == TCP_TIME_WAIT)
339 inet_twsk_put((struct inet_timewait_sock *)sk);
344 inet_diag_unlock_handler(handler);
348 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
350 int words = bits >> 5;
355 if (memcmp(a1, a2, words << 2))
365 mask = htonl((0xffffffff) << (32 - bits));
367 if ((w1 ^ w2) & mask)
375 static int inet_diag_bc_run(const void *bc, int len,
376 const struct inet_diag_entry *entry)
380 const struct inet_diag_bc_op *op = bc;
383 case INET_DIAG_BC_NOP:
385 case INET_DIAG_BC_JMP:
388 case INET_DIAG_BC_S_GE:
389 yes = entry->sport >= op[1].no;
391 case INET_DIAG_BC_S_LE:
392 yes = entry->sport <= op[1].no;
394 case INET_DIAG_BC_D_GE:
395 yes = entry->dport >= op[1].no;
397 case INET_DIAG_BC_D_LE:
398 yes = entry->dport <= op[1].no;
400 case INET_DIAG_BC_AUTO:
401 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
403 case INET_DIAG_BC_S_COND:
404 case INET_DIAG_BC_D_COND: {
405 struct inet_diag_hostcond *cond;
408 cond = (struct inet_diag_hostcond *)(op + 1);
409 if (cond->port != -1 &&
410 cond->port != (op->code == INET_DIAG_BC_S_COND ?
411 entry->sport : entry->dport)) {
416 if (cond->prefix_len == 0)
419 if (op->code == INET_DIAG_BC_S_COND)
424 if (bitstring_match(addr, cond->addr,
427 if (entry->family == AF_INET6 &&
428 cond->family == AF_INET) {
429 if (addr[0] == 0 && addr[1] == 0 &&
430 addr[2] == htonl(0xffff) &&
431 bitstring_match(addr + 3, cond->addr,
451 static int valid_cc(const void *bc, int len, int cc)
454 const struct inet_diag_bc_op *op = bc;
460 if (op->yes < 4 || op->yes & 3)
468 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
470 const void *bc = bytecode;
471 int len = bytecode_len;
474 const struct inet_diag_bc_op *op = bc;
476 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
478 case INET_DIAG_BC_AUTO:
479 case INET_DIAG_BC_S_COND:
480 case INET_DIAG_BC_D_COND:
481 case INET_DIAG_BC_S_GE:
482 case INET_DIAG_BC_S_LE:
483 case INET_DIAG_BC_D_GE:
484 case INET_DIAG_BC_D_LE:
485 case INET_DIAG_BC_JMP:
486 if (op->no < 4 || op->no > len + 4 || op->no & 3)
489 !valid_cc(bytecode, bytecode_len, len - op->no))
492 case INET_DIAG_BC_NOP:
497 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
502 return len == 0 ? 0 : -EINVAL;
505 static int inet_csk_diag_dump(struct sock *sk,
507 struct netlink_callback *cb)
509 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
511 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
512 struct inet_diag_entry entry;
513 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
515 INET_DIAG_REQ_BYTECODE);
516 struct inet_sock *inet = inet_sk(sk);
518 entry.family = sk->sk_family;
519 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
520 if (entry.family == AF_INET6) {
521 struct ipv6_pinfo *np = inet6_sk(sk);
523 entry.saddr = np->rcv_saddr.s6_addr32;
524 entry.daddr = np->daddr.s6_addr32;
528 entry.saddr = &inet->inet_rcv_saddr;
529 entry.daddr = &inet->inet_daddr;
531 entry.sport = inet->inet_num;
532 entry.dport = ntohs(inet->inet_dport);
533 entry.userlocks = sk->sk_userlocks;
535 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
539 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
540 NETLINK_CB(cb->skb).pid,
541 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
544 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
546 struct netlink_callback *cb)
548 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
550 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
551 struct inet_diag_entry entry;
552 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
554 INET_DIAG_REQ_BYTECODE);
556 entry.family = tw->tw_family;
557 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
558 if (tw->tw_family == AF_INET6) {
559 struct inet6_timewait_sock *tw6 =
560 inet6_twsk((struct sock *)tw);
561 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
562 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
566 entry.saddr = &tw->tw_rcv_saddr;
567 entry.daddr = &tw->tw_daddr;
569 entry.sport = tw->tw_num;
570 entry.dport = ntohs(tw->tw_dport);
573 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
577 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
578 NETLINK_CB(cb->skb).pid,
579 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
582 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
583 struct request_sock *req, u32 pid, u32 seq,
584 const struct nlmsghdr *unlh)
586 const struct inet_request_sock *ireq = inet_rsk(req);
587 struct inet_sock *inet = inet_sk(sk);
588 unsigned char *b = skb_tail_pointer(skb);
589 struct inet_diag_msg *r;
590 struct nlmsghdr *nlh;
593 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
594 nlh->nlmsg_flags = NLM_F_MULTI;
597 r->idiag_family = sk->sk_family;
598 r->idiag_state = TCP_SYN_RECV;
600 r->idiag_retrans = req->retrans;
602 r->id.idiag_if = sk->sk_bound_dev_if;
603 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
604 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
606 tmo = req->expires - jiffies;
610 r->id.idiag_sport = inet->inet_sport;
611 r->id.idiag_dport = ireq->rmt_port;
613 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
614 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
616 r->id.idiag_src[0] = ireq->loc_addr;
617 r->id.idiag_dst[0] = ireq->rmt_addr;
619 r->idiag_expires = jiffies_to_msecs(tmo);
622 r->idiag_uid = sock_i_uid(sk);
624 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
625 if (r->idiag_family == AF_INET6) {
626 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
627 &inet6_rsk(req)->loc_addr);
628 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
629 &inet6_rsk(req)->rmt_addr);
632 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
641 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
642 struct netlink_callback *cb)
644 struct inet_diag_entry entry;
645 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
646 struct inet_connection_sock *icsk = inet_csk(sk);
647 struct listen_sock *lopt;
648 const struct nlattr *bc = NULL;
649 struct inet_sock *inet = inet_sk(sk);
651 int reqnum, s_reqnum;
655 s_reqnum = cb->args[4];
660 entry.family = sk->sk_family;
662 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
664 lopt = icsk->icsk_accept_queue.listen_opt;
665 if (!lopt || !lopt->qlen)
668 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
669 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
670 INET_DIAG_REQ_BYTECODE);
671 entry.sport = inet->inet_num;
672 entry.userlocks = sk->sk_userlocks;
675 for (j = s_j; j < lopt->nr_table_entries; j++) {
676 struct request_sock *req, *head = lopt->syn_table[j];
679 for (req = head; req; reqnum++, req = req->dl_next) {
680 struct inet_request_sock *ireq = inet_rsk(req);
682 if (reqnum < s_reqnum)
684 if (r->id.idiag_dport != ireq->rmt_port &&
690 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
691 (entry.family == AF_INET6) ?
692 inet6_rsk(req)->loc_addr.s6_addr32 :
696 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
697 (entry.family == AF_INET6) ?
698 inet6_rsk(req)->rmt_addr.s6_addr32 :
701 entry.dport = ntohs(ireq->rmt_port);
703 if (!inet_diag_bc_run(nla_data(bc),
704 nla_len(bc), &entry))
708 err = inet_diag_fill_req(skb, sk, req,
709 NETLINK_CB(cb->skb).pid,
710 cb->nlh->nlmsg_seq, cb->nlh);
713 cb->args[4] = reqnum;
722 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
727 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
731 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
732 const struct inet_diag_handler *handler;
733 struct inet_hashinfo *hashinfo;
735 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
739 hashinfo = handler->idiag_hashinfo;
742 s_num = num = cb->args[2];
744 if (cb->args[0] == 0) {
745 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
748 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
750 struct hlist_nulls_node *node;
751 struct inet_listen_hashbucket *ilb;
754 ilb = &hashinfo->listening_hash[i];
755 spin_lock_bh(&ilb->lock);
756 sk_nulls_for_each(sk, node, &ilb->head) {
757 struct inet_sock *inet = inet_sk(sk);
764 if (r->id.idiag_sport != inet->inet_sport &&
768 if (!(r->idiag_states & TCPF_LISTEN) ||
773 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
774 spin_unlock_bh(&ilb->lock);
779 if (!(r->idiag_states & TCPF_SYN_RECV))
782 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
783 spin_unlock_bh(&ilb->lock);
792 spin_unlock_bh(&ilb->lock);
800 s_i = num = s_num = 0;
803 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
806 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
807 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
808 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
810 struct hlist_nulls_node *node;
814 if (hlist_nulls_empty(&head->chain) &&
815 hlist_nulls_empty(&head->twchain))
822 sk_nulls_for_each(sk, node, &head->chain) {
823 struct inet_sock *inet = inet_sk(sk);
827 if (!(r->idiag_states & (1 << sk->sk_state)))
829 if (r->id.idiag_sport != inet->inet_sport &&
832 if (r->id.idiag_dport != inet->inet_dport &&
835 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
836 spin_unlock_bh(lock);
843 if (r->idiag_states & (TCPF_TIME_WAIT | TCPF_FIN_WAIT2)) {
844 struct inet_timewait_sock *tw;
846 inet_twsk_for_each(tw, node,
851 if (!(r->idiag_states & (1 << tw->tw_substate)))
853 if (r->id.idiag_sport != tw->tw_sport &&
856 if (r->id.idiag_dport != tw->tw_dport &&
859 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
860 spin_unlock_bh(lock);
867 spin_unlock_bh(lock);
874 inet_diag_unlock_handler(handler);
878 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
880 int hdrlen = sizeof(struct inet_diag_req);
882 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
883 nlmsg_len(nlh) < hdrlen)
886 if (nlh->nlmsg_flags & NLM_F_DUMP) {
887 if (nlmsg_attrlen(nlh, hdrlen)) {
890 attr = nlmsg_find_attr(nlh, hdrlen,
891 INET_DIAG_REQ_BYTECODE);
893 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
894 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
898 return netlink_dump_start(idiagnl, skb, nlh,
899 inet_diag_dump, NULL, 0);
902 return inet_diag_get_exact(skb, nlh);
905 static DEFINE_MUTEX(inet_diag_mutex);
907 static void inet_diag_rcv(struct sk_buff *skb)
909 mutex_lock(&inet_diag_mutex);
910 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
911 mutex_unlock(&inet_diag_mutex);
914 int inet_diag_register(const struct inet_diag_handler *h)
916 const __u16 type = h->idiag_type;
919 if (type >= INET_DIAG_GETSOCK_MAX)
922 mutex_lock(&inet_diag_table_mutex);
924 if (inet_diag_table[type] == NULL) {
925 inet_diag_table[type] = h;
928 mutex_unlock(&inet_diag_table_mutex);
932 EXPORT_SYMBOL_GPL(inet_diag_register);
934 void inet_diag_unregister(const struct inet_diag_handler *h)
936 const __u16 type = h->idiag_type;
938 if (type >= INET_DIAG_GETSOCK_MAX)
941 mutex_lock(&inet_diag_table_mutex);
942 inet_diag_table[type] = NULL;
943 mutex_unlock(&inet_diag_table_mutex);
945 EXPORT_SYMBOL_GPL(inet_diag_unregister);
947 static int __init inet_diag_init(void)
949 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
950 sizeof(struct inet_diag_handler *));
953 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
954 if (!inet_diag_table)
957 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
958 inet_diag_rcv, NULL, THIS_MODULE);
965 kfree(inet_diag_table);
969 static void __exit inet_diag_exit(void)
971 netlink_kernel_release(idiagnl);
972 kfree(inet_diag_table);
975 module_init(inet_diag_init);
976 module_exit(inet_diag_exit);
977 MODULE_LICENSE("GPL");
978 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);