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>
36 #include <linux/sock_diag.h>
38 static const struct inet_diag_handler **inet_diag_table;
40 struct inet_diag_entry {
49 static DEFINE_MUTEX(inet_diag_table_mutex);
51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
53 if (!inet_diag_table[proto])
54 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
55 NETLINK_SOCK_DIAG, AF_INET, proto);
57 mutex_lock(&inet_diag_table_mutex);
58 if (!inet_diag_table[proto])
59 return ERR_PTR(-ENOENT);
61 return inet_diag_table[proto];
64 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
66 mutex_unlock(&inet_diag_table_mutex);
69 static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
71 r->idiag_family = sk->sk_family;
73 r->id.idiag_sport = htons(sk->sk_num);
74 r->id.idiag_dport = sk->sk_dport;
75 r->id.idiag_if = sk->sk_bound_dev_if;
76 sock_diag_save_cookie(sk, r->id.idiag_cookie);
78 #if IS_ENABLED(CONFIG_IPV6)
79 if (sk->sk_family == AF_INET6) {
80 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
81 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
85 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
86 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
88 r->id.idiag_src[0] = sk->sk_rcv_saddr;
89 r->id.idiag_dst[0] = sk->sk_daddr;
93 static size_t inet_sk_attr_size(void)
95 return nla_total_size(sizeof(struct tcp_info))
96 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
97 + nla_total_size(1) /* INET_DIAG_TOS */
98 + nla_total_size(1) /* INET_DIAG_TCLASS */
99 + nla_total_size(sizeof(struct inet_diag_meminfo))
100 + nla_total_size(sizeof(struct inet_diag_msg))
101 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
102 + nla_total_size(TCP_CA_NAME_MAX)
103 + nla_total_size(sizeof(struct tcpvegas_info))
107 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
108 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
109 struct user_namespace *user_ns,
110 u32 portid, u32 seq, u16 nlmsg_flags,
111 const struct nlmsghdr *unlh)
113 const struct inet_sock *inet = inet_sk(sk);
114 const struct tcp_congestion_ops *ca_ops;
115 const struct inet_diag_handler *handler;
116 int ext = req->idiag_ext;
117 struct inet_diag_msg *r;
118 struct nlmsghdr *nlh;
122 handler = inet_diag_table[req->sdiag_protocol];
125 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
131 BUG_ON(!sk_fullsock(sk));
133 inet_diag_msg_common_fill(r, sk);
134 r->idiag_state = sk->sk_state;
136 r->idiag_retrans = 0;
138 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
141 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
142 * hence this needs to be included regardless of socket family.
144 if (ext & (1 << (INET_DIAG_TOS - 1)))
145 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
148 #if IS_ENABLED(CONFIG_IPV6)
149 if (r->idiag_family == AF_INET6) {
150 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
151 if (nla_put_u8(skb, INET_DIAG_TCLASS,
152 inet6_sk(sk)->tclass) < 0)
157 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
158 r->idiag_inode = sock_i_ino(sk);
160 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
161 struct inet_diag_meminfo minfo = {
162 .idiag_rmem = sk_rmem_alloc_get(sk),
163 .idiag_wmem = sk->sk_wmem_queued,
164 .idiag_fmem = sk->sk_forward_alloc,
165 .idiag_tmem = sk_wmem_alloc_get(sk),
168 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
172 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
173 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
177 handler->idiag_get_info(sk, r, NULL);
181 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
183 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
184 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
185 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
187 r->idiag_retrans = icsk->icsk_retransmits;
188 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
189 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
191 r->idiag_retrans = icsk->icsk_probes_out;
192 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
193 } else if (timer_pending(&sk->sk_timer)) {
195 r->idiag_retrans = icsk->icsk_probes_out;
196 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
199 r->idiag_expires = 0;
203 if (ext & (1 << (INET_DIAG_INFO - 1))) {
204 attr = nla_reserve(skb, INET_DIAG_INFO,
205 sizeof(struct tcp_info));
209 info = nla_data(attr);
212 if (ext & (1 << (INET_DIAG_CONG - 1))) {
216 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
218 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
224 handler->idiag_get_info(sk, r, info);
226 if (sk->sk_state < TCP_TIME_WAIT) {
230 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
231 if (ca_ops && ca_ops->get_info)
232 err = ca_ops->get_info(sk, ext, skb);
243 nlmsg_cancel(skb, nlh);
246 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
248 static int inet_csk_diag_fill(struct sock *sk,
250 const struct inet_diag_req_v2 *req,
251 struct user_namespace *user_ns,
252 u32 portid, u32 seq, u16 nlmsg_flags,
253 const struct nlmsghdr *unlh)
255 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
256 user_ns, portid, seq, nlmsg_flags, unlh);
259 static int inet_twsk_diag_fill(struct sock *sk,
261 u32 portid, u32 seq, u16 nlmsg_flags,
262 const struct nlmsghdr *unlh)
264 struct inet_timewait_sock *tw = inet_twsk(sk);
265 struct inet_diag_msg *r;
266 struct nlmsghdr *nlh;
269 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
275 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
277 tmo = tw->tw_timer.expires - jiffies;
281 inet_diag_msg_common_fill(r, sk);
282 r->idiag_retrans = 0;
284 r->idiag_state = tw->tw_substate;
286 r->idiag_expires = jiffies_to_msecs(tmo);
296 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
297 u32 portid, u32 seq, u16 nlmsg_flags,
298 const struct nlmsghdr *unlh)
300 struct inet_diag_msg *r;
301 struct nlmsghdr *nlh;
304 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
310 inet_diag_msg_common_fill(r, sk);
311 r->idiag_state = TCP_SYN_RECV;
313 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
315 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
316 offsetof(struct sock, sk_cookie));
318 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
319 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
329 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
330 const struct inet_diag_req_v2 *r,
331 struct user_namespace *user_ns,
332 u32 portid, u32 seq, u16 nlmsg_flags,
333 const struct nlmsghdr *unlh)
335 if (sk->sk_state == TCP_TIME_WAIT)
336 return inet_twsk_diag_fill(sk, skb, portid, seq,
339 if (sk->sk_state == TCP_NEW_SYN_RECV)
340 return inet_req_diag_fill(sk, skb, portid, seq,
343 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
347 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
348 struct sk_buff *in_skb,
349 const struct nlmsghdr *nlh,
350 const struct inet_diag_req_v2 *req)
352 struct net *net = sock_net(in_skb->sk);
358 if (req->sdiag_family == AF_INET)
359 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
360 req->id.idiag_dport, req->id.idiag_src[0],
361 req->id.idiag_sport, req->id.idiag_if);
362 #if IS_ENABLED(CONFIG_IPV6)
363 else if (req->sdiag_family == AF_INET6)
364 sk = inet6_lookup(net, hashinfo,
365 (struct in6_addr *)req->id.idiag_dst,
367 (struct in6_addr *)req->id.idiag_src,
378 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
382 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
388 err = sk_diag_fill(sk, rep, req,
389 sk_user_ns(NETLINK_CB(in_skb).sk),
390 NETLINK_CB(in_skb).portid,
391 nlh->nlmsg_seq, 0, nlh);
393 WARN_ON(err == -EMSGSIZE);
397 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
409 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
411 static int inet_diag_get_exact(struct sk_buff *in_skb,
412 const struct nlmsghdr *nlh,
413 const struct inet_diag_req_v2 *req)
415 const struct inet_diag_handler *handler;
418 handler = inet_diag_lock_handler(req->sdiag_protocol);
420 err = PTR_ERR(handler);
422 err = handler->dump_one(in_skb, nlh, req);
423 inet_diag_unlock_handler(handler);
428 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
430 int words = bits >> 5;
435 if (memcmp(a1, a2, words << 2))
445 mask = htonl((0xffffffff) << (32 - bits));
447 if ((w1 ^ w2) & mask)
454 static int inet_diag_bc_run(const struct nlattr *_bc,
455 const struct inet_diag_entry *entry)
457 const void *bc = nla_data(_bc);
458 int len = nla_len(_bc);
462 const struct inet_diag_bc_op *op = bc;
465 case INET_DIAG_BC_NOP:
467 case INET_DIAG_BC_JMP:
470 case INET_DIAG_BC_S_GE:
471 yes = entry->sport >= op[1].no;
473 case INET_DIAG_BC_S_LE:
474 yes = entry->sport <= op[1].no;
476 case INET_DIAG_BC_D_GE:
477 yes = entry->dport >= op[1].no;
479 case INET_DIAG_BC_D_LE:
480 yes = entry->dport <= op[1].no;
482 case INET_DIAG_BC_AUTO:
483 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
485 case INET_DIAG_BC_S_COND:
486 case INET_DIAG_BC_D_COND: {
487 const struct inet_diag_hostcond *cond;
490 cond = (const struct inet_diag_hostcond *)(op + 1);
491 if (cond->port != -1 &&
492 cond->port != (op->code == INET_DIAG_BC_S_COND ?
493 entry->sport : entry->dport)) {
498 if (op->code == INET_DIAG_BC_S_COND)
503 if (cond->family != AF_UNSPEC &&
504 cond->family != entry->family) {
505 if (entry->family == AF_INET6 &&
506 cond->family == AF_INET) {
507 if (addr[0] == 0 && addr[1] == 0 &&
508 addr[2] == htonl(0xffff) &&
509 bitstring_match(addr + 3,
518 if (cond->prefix_len == 0)
520 if (bitstring_match(addr, cond->addr,
539 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
541 static void entry_fill_addrs(struct inet_diag_entry *entry,
542 const struct sock *sk)
544 #if IS_ENABLED(CONFIG_IPV6)
545 if (sk->sk_family == AF_INET6) {
546 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
547 entry->daddr = sk->sk_v6_daddr.s6_addr32;
551 entry->saddr = &sk->sk_rcv_saddr;
552 entry->daddr = &sk->sk_daddr;
556 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
558 struct inet_sock *inet = inet_sk(sk);
559 struct inet_diag_entry entry;
564 entry.family = sk->sk_family;
565 entry_fill_addrs(&entry, sk);
566 entry.sport = inet->inet_num;
567 entry.dport = ntohs(inet->inet_dport);
568 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
570 return inet_diag_bc_run(bc, &entry);
572 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
574 static int valid_cc(const void *bc, int len, int cc)
577 const struct inet_diag_bc_op *op = bc;
583 if (op->yes < 4 || op->yes & 3)
591 /* Validate an inet_diag_hostcond. */
592 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
595 struct inet_diag_hostcond *cond;
598 /* Check hostcond space. */
599 *min_len += sizeof(struct inet_diag_hostcond);
602 cond = (struct inet_diag_hostcond *)(op + 1);
604 /* Check address family and address length. */
605 switch (cond->family) {
610 addr_len = sizeof(struct in_addr);
613 addr_len = sizeof(struct in6_addr);
618 *min_len += addr_len;
622 /* Check prefix length (in bits) vs address length (in bytes). */
623 if (cond->prefix_len > 8 * addr_len)
629 /* Validate a port comparison operator. */
630 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
631 int len, int *min_len)
633 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
634 *min_len += sizeof(struct inet_diag_bc_op);
640 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
642 const void *bc = bytecode;
643 int len = bytecode_len;
646 int min_len = sizeof(struct inet_diag_bc_op);
647 const struct inet_diag_bc_op *op = bc;
650 case INET_DIAG_BC_S_COND:
651 case INET_DIAG_BC_D_COND:
652 if (!valid_hostcond(bc, len, &min_len))
655 case INET_DIAG_BC_S_GE:
656 case INET_DIAG_BC_S_LE:
657 case INET_DIAG_BC_D_GE:
658 case INET_DIAG_BC_D_LE:
659 if (!valid_port_comparison(bc, len, &min_len))
662 case INET_DIAG_BC_AUTO:
663 case INET_DIAG_BC_JMP:
664 case INET_DIAG_BC_NOP:
670 if (op->code != INET_DIAG_BC_NOP) {
671 if (op->no < min_len || op->no > len + 4 || op->no & 3)
674 !valid_cc(bytecode, bytecode_len, len - op->no))
678 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
683 return len == 0 ? 0 : -EINVAL;
686 static int inet_csk_diag_dump(struct sock *sk,
688 struct netlink_callback *cb,
689 const struct inet_diag_req_v2 *r,
690 const struct nlattr *bc)
692 if (!inet_diag_bc_sk(bc, sk))
695 return inet_csk_diag_fill(sk, skb, r,
696 sk_user_ns(NETLINK_CB(cb->skb).sk),
697 NETLINK_CB(cb->skb).portid,
698 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
701 static void twsk_build_assert(void)
703 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
704 offsetof(struct sock, sk_family));
706 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
707 offsetof(struct inet_sock, inet_num));
709 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
710 offsetof(struct inet_sock, inet_dport));
712 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
713 offsetof(struct inet_sock, inet_rcv_saddr));
715 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
716 offsetof(struct inet_sock, inet_daddr));
718 #if IS_ENABLED(CONFIG_IPV6)
719 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
720 offsetof(struct sock, sk_v6_rcv_saddr));
722 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
723 offsetof(struct sock, sk_v6_daddr));
727 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
728 struct netlink_callback *cb,
729 const struct inet_diag_req_v2 *r,
730 const struct nlattr *bc)
732 struct inet_connection_sock *icsk = inet_csk(sk);
733 struct inet_sock *inet = inet_sk(sk);
734 struct inet_diag_entry entry;
735 int j, s_j, reqnum, s_reqnum;
736 struct listen_sock *lopt;
740 s_reqnum = cb->args[4];
745 entry.family = sk->sk_family;
747 spin_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
749 lopt = icsk->icsk_accept_queue.listen_opt;
750 if (!lopt || !listen_sock_qlen(lopt))
754 entry.sport = inet->inet_num;
755 entry.userlocks = sk->sk_userlocks;
758 for (j = s_j; j < lopt->nr_table_entries; j++) {
759 struct request_sock *req, *head = lopt->syn_table[j];
762 for (req = head; req; reqnum++, req = req->dl_next) {
763 struct inet_request_sock *ireq = inet_rsk(req);
765 if (reqnum < s_reqnum)
767 if (r->id.idiag_dport != ireq->ir_rmt_port &&
772 /* Note: entry.sport and entry.userlocks are already set */
773 entry_fill_addrs(&entry, req_to_sk(req));
774 entry.dport = ntohs(ireq->ir_rmt_port);
776 if (!inet_diag_bc_run(bc, &entry))
780 err = inet_req_diag_fill(req_to_sk(req), skb,
781 NETLINK_CB(cb->skb).portid,
783 NLM_F_MULTI, cb->nlh);
786 cb->args[4] = reqnum;
795 spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
800 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
801 struct netlink_callback *cb,
802 const struct inet_diag_req_v2 *r, struct nlattr *bc)
804 struct net *net = sock_net(skb->sk);
805 int i, num, s_i, s_num;
808 s_num = num = cb->args[2];
810 if (cb->args[0] == 0) {
811 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
814 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
815 struct inet_listen_hashbucket *ilb;
816 struct hlist_nulls_node *node;
820 ilb = &hashinfo->listening_hash[i];
821 spin_lock_bh(&ilb->lock);
822 sk_nulls_for_each(sk, node, &ilb->head) {
823 struct inet_sock *inet = inet_sk(sk);
825 if (!net_eq(sock_net(sk), net))
833 if (r->sdiag_family != AF_UNSPEC &&
834 sk->sk_family != r->sdiag_family)
837 if (r->id.idiag_sport != inet->inet_sport &&
841 if (!(r->idiag_states & TCPF_LISTEN) ||
846 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
847 spin_unlock_bh(&ilb->lock);
852 if (!(r->idiag_states & TCPF_SYN_RECV))
855 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
856 spin_unlock_bh(&ilb->lock);
865 spin_unlock_bh(&ilb->lock);
873 s_i = num = s_num = 0;
876 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
879 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
880 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
881 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
882 struct hlist_nulls_node *node;
887 if (hlist_nulls_empty(&head->chain))
894 sk_nulls_for_each(sk, node, &head->chain) {
897 if (!net_eq(sock_net(sk), net))
901 state = (sk->sk_state == TCP_TIME_WAIT) ?
902 inet_twsk(sk)->tw_substate : sk->sk_state;
903 if (!(r->idiag_states & (1 << state)))
905 if (r->sdiag_family != AF_UNSPEC &&
906 sk->sk_family != r->sdiag_family)
908 if (r->id.idiag_sport != htons(sk->sk_num) &&
911 if (r->id.idiag_dport != sk->sk_dport &&
916 if (!inet_diag_bc_sk(bc, sk))
919 res = sk_diag_fill(sk, skb, r,
920 sk_user_ns(NETLINK_CB(cb->skb).sk),
921 NETLINK_CB(cb->skb).portid,
922 cb->nlh->nlmsg_seq, NLM_F_MULTI,
925 spin_unlock_bh(lock);
932 spin_unlock_bh(lock);
941 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
943 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
944 const struct inet_diag_req_v2 *r,
947 const struct inet_diag_handler *handler;
950 handler = inet_diag_lock_handler(r->sdiag_protocol);
951 if (!IS_ERR(handler))
952 handler->dump(skb, cb, r, bc);
954 err = PTR_ERR(handler);
955 inet_diag_unlock_handler(handler);
957 return err ? : skb->len;
960 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
962 int hdrlen = sizeof(struct inet_diag_req_v2);
963 struct nlattr *bc = NULL;
965 if (nlmsg_attrlen(cb->nlh, hdrlen))
966 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
968 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
971 static int inet_diag_type2proto(int type)
974 case TCPDIAG_GETSOCK:
976 case DCCPDIAG_GETSOCK:
983 static int inet_diag_dump_compat(struct sk_buff *skb,
984 struct netlink_callback *cb)
986 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
987 int hdrlen = sizeof(struct inet_diag_req);
988 struct inet_diag_req_v2 req;
989 struct nlattr *bc = NULL;
991 req.sdiag_family = AF_UNSPEC; /* compatibility */
992 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
993 req.idiag_ext = rc->idiag_ext;
994 req.idiag_states = rc->idiag_states;
997 if (nlmsg_attrlen(cb->nlh, hdrlen))
998 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1000 return __inet_diag_dump(skb, cb, &req, bc);
1003 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1004 const struct nlmsghdr *nlh)
1006 struct inet_diag_req *rc = nlmsg_data(nlh);
1007 struct inet_diag_req_v2 req;
1009 req.sdiag_family = rc->idiag_family;
1010 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1011 req.idiag_ext = rc->idiag_ext;
1012 req.idiag_states = rc->idiag_states;
1015 return inet_diag_get_exact(in_skb, nlh, &req);
1018 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1020 int hdrlen = sizeof(struct inet_diag_req);
1021 struct net *net = sock_net(skb->sk);
1023 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1024 nlmsg_len(nlh) < hdrlen)
1027 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1028 if (nlmsg_attrlen(nlh, hdrlen)) {
1029 struct nlattr *attr;
1031 attr = nlmsg_find_attr(nlh, hdrlen,
1032 INET_DIAG_REQ_BYTECODE);
1034 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1035 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1039 struct netlink_dump_control c = {
1040 .dump = inet_diag_dump_compat,
1042 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1046 return inet_diag_get_exact_compat(skb, nlh);
1049 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1051 int hdrlen = sizeof(struct inet_diag_req_v2);
1052 struct net *net = sock_net(skb->sk);
1054 if (nlmsg_len(h) < hdrlen)
1057 if (h->nlmsg_flags & NLM_F_DUMP) {
1058 if (nlmsg_attrlen(h, hdrlen)) {
1059 struct nlattr *attr;
1061 attr = nlmsg_find_attr(h, hdrlen,
1062 INET_DIAG_REQ_BYTECODE);
1064 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1065 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1069 struct netlink_dump_control c = {
1070 .dump = inet_diag_dump,
1072 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1076 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1079 static const struct sock_diag_handler inet_diag_handler = {
1081 .dump = inet_diag_handler_dump,
1084 static const struct sock_diag_handler inet6_diag_handler = {
1086 .dump = inet_diag_handler_dump,
1089 int inet_diag_register(const struct inet_diag_handler *h)
1091 const __u16 type = h->idiag_type;
1094 if (type >= IPPROTO_MAX)
1097 mutex_lock(&inet_diag_table_mutex);
1099 if (!inet_diag_table[type]) {
1100 inet_diag_table[type] = h;
1103 mutex_unlock(&inet_diag_table_mutex);
1107 EXPORT_SYMBOL_GPL(inet_diag_register);
1109 void inet_diag_unregister(const struct inet_diag_handler *h)
1111 const __u16 type = h->idiag_type;
1113 if (type >= IPPROTO_MAX)
1116 mutex_lock(&inet_diag_table_mutex);
1117 inet_diag_table[type] = NULL;
1118 mutex_unlock(&inet_diag_table_mutex);
1120 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1122 static int __init inet_diag_init(void)
1124 const int inet_diag_table_size = (IPPROTO_MAX *
1125 sizeof(struct inet_diag_handler *));
1128 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1129 if (!inet_diag_table)
1132 err = sock_diag_register(&inet_diag_handler);
1136 err = sock_diag_register(&inet6_diag_handler);
1140 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1145 sock_diag_unregister(&inet_diag_handler);
1147 kfree(inet_diag_table);
1151 static void __exit inet_diag_exit(void)
1153 sock_diag_unregister(&inet6_diag_handler);
1154 sock_diag_unregister(&inet_diag_handler);
1155 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1156 kfree(inet_diag_table);
1159 module_init(inet_diag_init);
1160 module_exit(inet_diag_exit);
1161 MODULE_LICENSE("GPL");
1162 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1163 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);