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 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;
92 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
94 static size_t inet_sk_attr_size(void)
96 return nla_total_size(sizeof(struct tcp_info))
97 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
98 + nla_total_size(1) /* INET_DIAG_TOS */
99 + nla_total_size(1) /* INET_DIAG_TCLASS */
100 + nla_total_size(sizeof(struct inet_diag_meminfo))
101 + nla_total_size(sizeof(struct inet_diag_msg))
102 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
103 + nla_total_size(TCP_CA_NAME_MAX)
104 + nla_total_size(sizeof(struct tcpvegas_info))
108 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
109 struct inet_diag_msg *r, int ext,
110 struct user_namespace *user_ns)
112 const struct inet_sock *inet = inet_sk(sk);
114 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
117 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
118 * hence this needs to be included regardless of socket family.
120 if (ext & (1 << (INET_DIAG_TOS - 1)))
121 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
124 #if IS_ENABLED(CONFIG_IPV6)
125 if (r->idiag_family == AF_INET6) {
126 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
127 if (nla_put_u8(skb, INET_DIAG_TCLASS,
128 inet6_sk(sk)->tclass) < 0)
131 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
132 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
137 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
138 r->idiag_inode = sock_i_ino(sk);
144 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
146 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
147 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
148 struct user_namespace *user_ns,
149 u32 portid, u32 seq, u16 nlmsg_flags,
150 const struct nlmsghdr *unlh)
152 const struct tcp_congestion_ops *ca_ops;
153 const struct inet_diag_handler *handler;
154 int ext = req->idiag_ext;
155 struct inet_diag_msg *r;
156 struct nlmsghdr *nlh;
160 handler = inet_diag_table[req->sdiag_protocol];
163 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
169 BUG_ON(!sk_fullsock(sk));
171 inet_diag_msg_common_fill(r, sk);
172 r->idiag_state = sk->sk_state;
174 r->idiag_retrans = 0;
176 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
179 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
180 struct inet_diag_meminfo minfo = {
181 .idiag_rmem = sk_rmem_alloc_get(sk),
182 .idiag_wmem = sk->sk_wmem_queued,
183 .idiag_fmem = sk->sk_forward_alloc,
184 .idiag_tmem = sk_wmem_alloc_get(sk),
187 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
191 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
192 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
196 handler->idiag_get_info(sk, r, NULL);
200 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
201 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
202 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
204 r->idiag_retrans = icsk->icsk_retransmits;
206 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
207 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
209 r->idiag_retrans = icsk->icsk_probes_out;
211 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
212 } else if (timer_pending(&sk->sk_timer)) {
214 r->idiag_retrans = icsk->icsk_probes_out;
216 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
219 r->idiag_expires = 0;
222 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
223 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
224 handler->idiag_info_size,
229 info = nla_data(attr);
232 if (ext & (1 << (INET_DIAG_CONG - 1))) {
236 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
238 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
244 handler->idiag_get_info(sk, r, info);
246 if (sk->sk_state < TCP_TIME_WAIT) {
247 union tcp_cc_info info;
252 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
253 if (ca_ops && ca_ops->get_info)
254 sz = ca_ops->get_info(sk, ext, &attr, &info);
256 if (sz && nla_put(skb, attr, sz, &info) < 0)
265 nlmsg_cancel(skb, nlh);
268 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
270 static int inet_csk_diag_fill(struct sock *sk,
272 const struct inet_diag_req_v2 *req,
273 struct user_namespace *user_ns,
274 u32 portid, u32 seq, u16 nlmsg_flags,
275 const struct nlmsghdr *unlh)
277 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
278 user_ns, portid, seq, nlmsg_flags, unlh);
281 static int inet_twsk_diag_fill(struct sock *sk,
283 u32 portid, u32 seq, u16 nlmsg_flags,
284 const struct nlmsghdr *unlh)
286 struct inet_timewait_sock *tw = inet_twsk(sk);
287 struct inet_diag_msg *r;
288 struct nlmsghdr *nlh;
291 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
297 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
299 tmo = tw->tw_timer.expires - jiffies;
303 inet_diag_msg_common_fill(r, sk);
304 r->idiag_retrans = 0;
306 r->idiag_state = tw->tw_substate;
308 r->idiag_expires = jiffies_to_msecs(tmo);
318 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
319 u32 portid, u32 seq, u16 nlmsg_flags,
320 const struct nlmsghdr *unlh)
322 struct inet_diag_msg *r;
323 struct nlmsghdr *nlh;
326 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
332 inet_diag_msg_common_fill(r, sk);
333 r->idiag_state = TCP_SYN_RECV;
335 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
337 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
338 offsetof(struct sock, sk_cookie));
340 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
341 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
351 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
352 const struct inet_diag_req_v2 *r,
353 struct user_namespace *user_ns,
354 u32 portid, u32 seq, u16 nlmsg_flags,
355 const struct nlmsghdr *unlh)
357 if (sk->sk_state == TCP_TIME_WAIT)
358 return inet_twsk_diag_fill(sk, skb, portid, seq,
361 if (sk->sk_state == TCP_NEW_SYN_RECV)
362 return inet_req_diag_fill(sk, skb, portid, seq,
365 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
369 struct sock *inet_diag_find_one_icsk(struct net *net,
370 struct inet_hashinfo *hashinfo,
371 const struct inet_diag_req_v2 *req)
376 if (req->sdiag_family == AF_INET)
377 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
378 req->id.idiag_dport, req->id.idiag_src[0],
379 req->id.idiag_sport, req->id.idiag_if);
380 #if IS_ENABLED(CONFIG_IPV6)
381 else if (req->sdiag_family == AF_INET6) {
382 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
383 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
384 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
385 req->id.idiag_dport, req->id.idiag_src[3],
386 req->id.idiag_sport, req->id.idiag_if);
388 sk = inet6_lookup(net, hashinfo, NULL, 0,
389 (struct in6_addr *)req->id.idiag_dst,
391 (struct in6_addr *)req->id.idiag_src,
398 return ERR_PTR(-EINVAL);
402 return ERR_PTR(-ENOENT);
404 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
406 return ERR_PTR(-ENOENT);
411 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
413 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
414 struct sk_buff *in_skb,
415 const struct nlmsghdr *nlh,
416 const struct inet_diag_req_v2 *req)
418 struct net *net = sock_net(in_skb->sk);
423 sk = inet_diag_find_one_icsk(net, hashinfo, req);
427 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
433 err = sk_diag_fill(sk, rep, req,
434 sk_user_ns(NETLINK_CB(in_skb).sk),
435 NETLINK_CB(in_skb).portid,
436 nlh->nlmsg_seq, 0, nlh);
438 WARN_ON(err == -EMSGSIZE);
442 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
453 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
455 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
456 const struct nlmsghdr *nlh,
457 const struct inet_diag_req_v2 *req)
459 const struct inet_diag_handler *handler;
462 handler = inet_diag_lock_handler(req->sdiag_protocol);
464 err = PTR_ERR(handler);
465 else if (cmd == SOCK_DIAG_BY_FAMILY)
466 err = handler->dump_one(in_skb, nlh, req);
467 else if (cmd == SOCK_DESTROY && handler->destroy)
468 err = handler->destroy(in_skb, req);
471 inet_diag_unlock_handler(handler);
476 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
478 int words = bits >> 5;
483 if (memcmp(a1, a2, words << 2))
493 mask = htonl((0xffffffff) << (32 - bits));
495 if ((w1 ^ w2) & mask)
502 static int inet_diag_bc_run(const struct nlattr *_bc,
503 const struct inet_diag_entry *entry)
505 const void *bc = nla_data(_bc);
506 int len = nla_len(_bc);
510 const struct inet_diag_bc_op *op = bc;
513 case INET_DIAG_BC_NOP:
515 case INET_DIAG_BC_JMP:
518 case INET_DIAG_BC_S_GE:
519 yes = entry->sport >= op[1].no;
521 case INET_DIAG_BC_S_LE:
522 yes = entry->sport <= op[1].no;
524 case INET_DIAG_BC_D_GE:
525 yes = entry->dport >= op[1].no;
527 case INET_DIAG_BC_D_LE:
528 yes = entry->dport <= op[1].no;
530 case INET_DIAG_BC_AUTO:
531 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
533 case INET_DIAG_BC_S_COND:
534 case INET_DIAG_BC_D_COND: {
535 const struct inet_diag_hostcond *cond;
538 cond = (const struct inet_diag_hostcond *)(op + 1);
539 if (cond->port != -1 &&
540 cond->port != (op->code == INET_DIAG_BC_S_COND ?
541 entry->sport : entry->dport)) {
546 if (op->code == INET_DIAG_BC_S_COND)
551 if (cond->family != AF_UNSPEC &&
552 cond->family != entry->family) {
553 if (entry->family == AF_INET6 &&
554 cond->family == AF_INET) {
555 if (addr[0] == 0 && addr[1] == 0 &&
556 addr[2] == htonl(0xffff) &&
557 bitstring_match(addr + 3,
566 if (cond->prefix_len == 0)
568 if (bitstring_match(addr, cond->addr,
587 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
589 static void entry_fill_addrs(struct inet_diag_entry *entry,
590 const struct sock *sk)
592 #if IS_ENABLED(CONFIG_IPV6)
593 if (sk->sk_family == AF_INET6) {
594 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
595 entry->daddr = sk->sk_v6_daddr.s6_addr32;
599 entry->saddr = &sk->sk_rcv_saddr;
600 entry->daddr = &sk->sk_daddr;
604 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
606 struct inet_sock *inet = inet_sk(sk);
607 struct inet_diag_entry entry;
612 entry.family = sk->sk_family;
613 entry_fill_addrs(&entry, sk);
614 entry.sport = inet->inet_num;
615 entry.dport = ntohs(inet->inet_dport);
616 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
618 return inet_diag_bc_run(bc, &entry);
620 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
622 static int valid_cc(const void *bc, int len, int cc)
625 const struct inet_diag_bc_op *op = bc;
631 if (op->yes < 4 || op->yes & 3)
639 /* Validate an inet_diag_hostcond. */
640 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
643 struct inet_diag_hostcond *cond;
646 /* Check hostcond space. */
647 *min_len += sizeof(struct inet_diag_hostcond);
650 cond = (struct inet_diag_hostcond *)(op + 1);
652 /* Check address family and address length. */
653 switch (cond->family) {
658 addr_len = sizeof(struct in_addr);
661 addr_len = sizeof(struct in6_addr);
666 *min_len += addr_len;
670 /* Check prefix length (in bits) vs address length (in bytes). */
671 if (cond->prefix_len > 8 * addr_len)
677 /* Validate a port comparison operator. */
678 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
679 int len, int *min_len)
681 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
682 *min_len += sizeof(struct inet_diag_bc_op);
688 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
690 const void *bc = bytecode;
691 int len = bytecode_len;
694 int min_len = sizeof(struct inet_diag_bc_op);
695 const struct inet_diag_bc_op *op = bc;
698 case INET_DIAG_BC_S_COND:
699 case INET_DIAG_BC_D_COND:
700 if (!valid_hostcond(bc, len, &min_len))
703 case INET_DIAG_BC_S_GE:
704 case INET_DIAG_BC_S_LE:
705 case INET_DIAG_BC_D_GE:
706 case INET_DIAG_BC_D_LE:
707 if (!valid_port_comparison(bc, len, &min_len))
710 case INET_DIAG_BC_AUTO:
711 case INET_DIAG_BC_JMP:
712 case INET_DIAG_BC_NOP:
718 if (op->code != INET_DIAG_BC_NOP) {
719 if (op->no < min_len || op->no > len + 4 || op->no & 3)
722 !valid_cc(bytecode, bytecode_len, len - op->no))
726 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
731 return len == 0 ? 0 : -EINVAL;
734 static int inet_csk_diag_dump(struct sock *sk,
736 struct netlink_callback *cb,
737 const struct inet_diag_req_v2 *r,
738 const struct nlattr *bc)
740 if (!inet_diag_bc_sk(bc, sk))
743 return inet_csk_diag_fill(sk, skb, r,
744 sk_user_ns(NETLINK_CB(cb->skb).sk),
745 NETLINK_CB(cb->skb).portid,
746 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
749 static void twsk_build_assert(void)
751 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
752 offsetof(struct sock, sk_family));
754 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
755 offsetof(struct inet_sock, inet_num));
757 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
758 offsetof(struct inet_sock, inet_dport));
760 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
761 offsetof(struct inet_sock, inet_rcv_saddr));
763 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
764 offsetof(struct inet_sock, inet_daddr));
766 #if IS_ENABLED(CONFIG_IPV6)
767 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
768 offsetof(struct sock, sk_v6_rcv_saddr));
770 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
771 offsetof(struct sock, sk_v6_daddr));
775 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
776 struct netlink_callback *cb,
777 const struct inet_diag_req_v2 *r, struct nlattr *bc)
779 struct net *net = sock_net(skb->sk);
780 int i, num, s_i, s_num;
781 u32 idiag_states = r->idiag_states;
783 if (idiag_states & TCPF_SYN_RECV)
784 idiag_states |= TCPF_NEW_SYN_RECV;
786 s_num = num = cb->args[2];
788 if (cb->args[0] == 0) {
789 if (!(idiag_states & TCPF_LISTEN))
792 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
793 struct inet_listen_hashbucket *ilb;
797 ilb = &hashinfo->listening_hash[i];
798 spin_lock_bh(&ilb->lock);
799 sk_for_each(sk, &ilb->head) {
800 struct inet_sock *inet = inet_sk(sk);
802 if (!net_eq(sock_net(sk), net))
810 if (r->sdiag_family != AF_UNSPEC &&
811 sk->sk_family != r->sdiag_family)
814 if (r->id.idiag_sport != inet->inet_sport &&
818 if (r->id.idiag_dport ||
822 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
823 spin_unlock_bh(&ilb->lock);
832 spin_unlock_bh(&ilb->lock);
840 s_i = num = s_num = 0;
843 if (!(idiag_states & ~TCPF_LISTEN))
846 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
847 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
848 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
849 struct hlist_nulls_node *node;
854 if (hlist_nulls_empty(&head->chain))
861 sk_nulls_for_each(sk, node, &head->chain) {
864 if (!net_eq(sock_net(sk), net))
868 state = (sk->sk_state == TCP_TIME_WAIT) ?
869 inet_twsk(sk)->tw_substate : sk->sk_state;
870 if (!(idiag_states & (1 << state)))
872 if (r->sdiag_family != AF_UNSPEC &&
873 sk->sk_family != r->sdiag_family)
875 if (r->id.idiag_sport != htons(sk->sk_num) &&
878 if (r->id.idiag_dport != sk->sk_dport &&
883 if (!inet_diag_bc_sk(bc, sk))
886 res = sk_diag_fill(sk, skb, r,
887 sk_user_ns(NETLINK_CB(cb->skb).sk),
888 NETLINK_CB(cb->skb).portid,
889 cb->nlh->nlmsg_seq, NLM_F_MULTI,
892 spin_unlock_bh(lock);
899 spin_unlock_bh(lock);
909 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
911 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
912 const struct inet_diag_req_v2 *r,
915 const struct inet_diag_handler *handler;
918 handler = inet_diag_lock_handler(r->sdiag_protocol);
919 if (!IS_ERR(handler))
920 handler->dump(skb, cb, r, bc);
922 err = PTR_ERR(handler);
923 inet_diag_unlock_handler(handler);
925 return err ? : skb->len;
928 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
930 int hdrlen = sizeof(struct inet_diag_req_v2);
931 struct nlattr *bc = NULL;
933 if (nlmsg_attrlen(cb->nlh, hdrlen))
934 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
936 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
939 static int inet_diag_type2proto(int type)
942 case TCPDIAG_GETSOCK:
944 case DCCPDIAG_GETSOCK:
951 static int inet_diag_dump_compat(struct sk_buff *skb,
952 struct netlink_callback *cb)
954 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
955 int hdrlen = sizeof(struct inet_diag_req);
956 struct inet_diag_req_v2 req;
957 struct nlattr *bc = NULL;
959 req.sdiag_family = AF_UNSPEC; /* compatibility */
960 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
961 req.idiag_ext = rc->idiag_ext;
962 req.idiag_states = rc->idiag_states;
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, &req, bc);
971 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
972 const struct nlmsghdr *nlh)
974 struct inet_diag_req *rc = nlmsg_data(nlh);
975 struct inet_diag_req_v2 req;
977 req.sdiag_family = rc->idiag_family;
978 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
979 req.idiag_ext = rc->idiag_ext;
980 req.idiag_states = rc->idiag_states;
983 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
986 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
988 int hdrlen = sizeof(struct inet_diag_req);
989 struct net *net = sock_net(skb->sk);
991 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
992 nlmsg_len(nlh) < hdrlen)
995 if (nlh->nlmsg_flags & NLM_F_DUMP) {
996 if (nlmsg_attrlen(nlh, hdrlen)) {
999 attr = nlmsg_find_attr(nlh, hdrlen,
1000 INET_DIAG_REQ_BYTECODE);
1002 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1003 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1007 struct netlink_dump_control c = {
1008 .dump = inet_diag_dump_compat,
1010 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1014 return inet_diag_get_exact_compat(skb, nlh);
1017 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1019 int hdrlen = sizeof(struct inet_diag_req_v2);
1020 struct net *net = sock_net(skb->sk);
1022 if (nlmsg_len(h) < hdrlen)
1025 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1026 h->nlmsg_flags & NLM_F_DUMP) {
1027 if (nlmsg_attrlen(h, hdrlen)) {
1028 struct nlattr *attr;
1030 attr = nlmsg_find_attr(h, hdrlen,
1031 INET_DIAG_REQ_BYTECODE);
1033 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1034 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1038 struct netlink_dump_control c = {
1039 .dump = inet_diag_dump,
1041 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1045 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1049 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1051 const struct inet_diag_handler *handler;
1052 struct nlmsghdr *nlh;
1053 struct nlattr *attr;
1054 struct inet_diag_msg *r;
1058 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1062 r = nlmsg_data(nlh);
1063 memset(r, 0, sizeof(*r));
1064 inet_diag_msg_common_fill(r, sk);
1065 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1066 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1067 r->idiag_state = sk->sk_state;
1069 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1070 nlmsg_cancel(skb, nlh);
1074 handler = inet_diag_lock_handler(sk->sk_protocol);
1075 if (IS_ERR(handler)) {
1076 inet_diag_unlock_handler(handler);
1077 nlmsg_cancel(skb, nlh);
1078 return PTR_ERR(handler);
1081 attr = handler->idiag_info_size
1082 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1083 handler->idiag_info_size,
1087 info = nla_data(attr);
1089 handler->idiag_get_info(sk, r, info);
1090 inet_diag_unlock_handler(handler);
1092 nlmsg_end(skb, nlh);
1096 static const struct sock_diag_handler inet_diag_handler = {
1098 .dump = inet_diag_handler_cmd,
1099 .get_info = inet_diag_handler_get_info,
1100 .destroy = inet_diag_handler_cmd,
1103 static const struct sock_diag_handler inet6_diag_handler = {
1105 .dump = inet_diag_handler_cmd,
1106 .get_info = inet_diag_handler_get_info,
1107 .destroy = inet_diag_handler_cmd,
1110 int inet_diag_register(const struct inet_diag_handler *h)
1112 const __u16 type = h->idiag_type;
1115 if (type >= IPPROTO_MAX)
1118 mutex_lock(&inet_diag_table_mutex);
1120 if (!inet_diag_table[type]) {
1121 inet_diag_table[type] = h;
1124 mutex_unlock(&inet_diag_table_mutex);
1128 EXPORT_SYMBOL_GPL(inet_diag_register);
1130 void inet_diag_unregister(const struct inet_diag_handler *h)
1132 const __u16 type = h->idiag_type;
1134 if (type >= IPPROTO_MAX)
1137 mutex_lock(&inet_diag_table_mutex);
1138 inet_diag_table[type] = NULL;
1139 mutex_unlock(&inet_diag_table_mutex);
1141 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1143 static int __init inet_diag_init(void)
1145 const int inet_diag_table_size = (IPPROTO_MAX *
1146 sizeof(struct inet_diag_handler *));
1149 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1150 if (!inet_diag_table)
1153 err = sock_diag_register(&inet_diag_handler);
1157 err = sock_diag_register(&inet6_diag_handler);
1161 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1166 sock_diag_unregister(&inet_diag_handler);
1168 kfree(inet_diag_table);
1172 static void __exit inet_diag_exit(void)
1174 sock_diag_unregister(&inet6_diag_handler);
1175 sock_diag_unregister(&inet_diag_handler);
1176 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1177 kfree(inet_diag_table);
1180 module_init(inet_diag_init);
1181 module_exit(inet_diag_exit);
1182 MODULE_LICENSE("GPL");
1183 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1184 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);