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)
155 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
156 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
161 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
162 r->idiag_inode = sock_i_ino(sk);
164 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
165 struct inet_diag_meminfo minfo = {
166 .idiag_rmem = sk_rmem_alloc_get(sk),
167 .idiag_wmem = sk->sk_wmem_queued,
168 .idiag_fmem = sk->sk_forward_alloc,
169 .idiag_tmem = sk_wmem_alloc_get(sk),
172 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
176 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
177 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
181 handler->idiag_get_info(sk, r, NULL);
185 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
187 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
188 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
189 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
191 r->idiag_retrans = icsk->icsk_retransmits;
192 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
193 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
195 r->idiag_retrans = icsk->icsk_probes_out;
196 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
197 } else if (timer_pending(&sk->sk_timer)) {
199 r->idiag_retrans = icsk->icsk_probes_out;
200 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
203 r->idiag_expires = 0;
207 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
208 attr = nla_reserve(skb, INET_DIAG_INFO,
209 handler->idiag_info_size);
213 info = nla_data(attr);
216 if (ext & (1 << (INET_DIAG_CONG - 1))) {
220 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
222 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
228 handler->idiag_get_info(sk, r, info);
230 if (sk->sk_state < TCP_TIME_WAIT) {
231 union tcp_cc_info info;
236 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
237 if (ca_ops && ca_ops->get_info)
238 sz = ca_ops->get_info(sk, ext, &attr, &info);
240 if (sz && nla_put(skb, attr, sz, &info) < 0)
249 nlmsg_cancel(skb, nlh);
252 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
254 static int inet_csk_diag_fill(struct sock *sk,
256 const struct inet_diag_req_v2 *req,
257 struct user_namespace *user_ns,
258 u32 portid, u32 seq, u16 nlmsg_flags,
259 const struct nlmsghdr *unlh)
261 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
262 user_ns, portid, seq, nlmsg_flags, unlh);
265 static int inet_twsk_diag_fill(struct sock *sk,
267 u32 portid, u32 seq, u16 nlmsg_flags,
268 const struct nlmsghdr *unlh)
270 struct inet_timewait_sock *tw = inet_twsk(sk);
271 struct inet_diag_msg *r;
272 struct nlmsghdr *nlh;
275 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
281 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
283 tmo = tw->tw_timer.expires - jiffies;
287 inet_diag_msg_common_fill(r, sk);
288 r->idiag_retrans = 0;
290 r->idiag_state = tw->tw_substate;
292 r->idiag_expires = jiffies_to_msecs(tmo);
302 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
303 u32 portid, u32 seq, u16 nlmsg_flags,
304 const struct nlmsghdr *unlh)
306 struct inet_diag_msg *r;
307 struct nlmsghdr *nlh;
310 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
316 inet_diag_msg_common_fill(r, sk);
317 r->idiag_state = TCP_SYN_RECV;
319 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
321 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
322 offsetof(struct sock, sk_cookie));
324 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
325 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
335 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
336 const struct inet_diag_req_v2 *r,
337 struct user_namespace *user_ns,
338 u32 portid, u32 seq, u16 nlmsg_flags,
339 const struct nlmsghdr *unlh)
341 if (sk->sk_state == TCP_TIME_WAIT)
342 return inet_twsk_diag_fill(sk, skb, portid, seq,
345 if (sk->sk_state == TCP_NEW_SYN_RECV)
346 return inet_req_diag_fill(sk, skb, portid, seq,
349 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
353 struct sock *inet_diag_find_one_icsk(struct net *net,
354 struct inet_hashinfo *hashinfo,
355 const struct inet_diag_req_v2 *req)
359 if (req->sdiag_family == AF_INET)
360 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
361 req->id.idiag_dport, req->id.idiag_src[0],
362 req->id.idiag_sport, req->id.idiag_if);
363 #if IS_ENABLED(CONFIG_IPV6)
364 else if (req->sdiag_family == AF_INET6) {
365 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
366 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
367 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
368 req->id.idiag_dport, req->id.idiag_src[3],
369 req->id.idiag_sport, req->id.idiag_if);
371 sk = inet6_lookup(net, hashinfo, NULL, 0,
372 (struct in6_addr *)req->id.idiag_dst,
374 (struct in6_addr *)req->id.idiag_src,
380 return ERR_PTR(-EINVAL);
383 return ERR_PTR(-ENOENT);
385 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
387 return ERR_PTR(-ENOENT);
392 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
394 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
395 struct sk_buff *in_skb,
396 const struct nlmsghdr *nlh,
397 const struct inet_diag_req_v2 *req)
399 struct net *net = sock_net(in_skb->sk);
404 sk = inet_diag_find_one_icsk(net, hashinfo, req);
408 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
414 err = sk_diag_fill(sk, rep, req,
415 sk_user_ns(NETLINK_CB(in_skb).sk),
416 NETLINK_CB(in_skb).portid,
417 nlh->nlmsg_seq, 0, nlh);
419 WARN_ON(err == -EMSGSIZE);
423 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
434 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
436 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
437 const struct nlmsghdr *nlh,
438 const struct inet_diag_req_v2 *req)
440 const struct inet_diag_handler *handler;
443 handler = inet_diag_lock_handler(req->sdiag_protocol);
445 err = PTR_ERR(handler);
446 else if (cmd == SOCK_DIAG_BY_FAMILY)
447 err = handler->dump_one(in_skb, nlh, req);
448 else if (cmd == SOCK_DESTROY && handler->destroy)
449 err = handler->destroy(in_skb, req);
452 inet_diag_unlock_handler(handler);
457 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
459 int words = bits >> 5;
464 if (memcmp(a1, a2, words << 2))
474 mask = htonl((0xffffffff) << (32 - bits));
476 if ((w1 ^ w2) & mask)
483 static int inet_diag_bc_run(const struct nlattr *_bc,
484 const struct inet_diag_entry *entry)
486 const void *bc = nla_data(_bc);
487 int len = nla_len(_bc);
491 const struct inet_diag_bc_op *op = bc;
494 case INET_DIAG_BC_NOP:
496 case INET_DIAG_BC_JMP:
499 case INET_DIAG_BC_S_GE:
500 yes = entry->sport >= op[1].no;
502 case INET_DIAG_BC_S_LE:
503 yes = entry->sport <= op[1].no;
505 case INET_DIAG_BC_D_GE:
506 yes = entry->dport >= op[1].no;
508 case INET_DIAG_BC_D_LE:
509 yes = entry->dport <= op[1].no;
511 case INET_DIAG_BC_AUTO:
512 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
514 case INET_DIAG_BC_S_COND:
515 case INET_DIAG_BC_D_COND: {
516 const struct inet_diag_hostcond *cond;
519 cond = (const struct inet_diag_hostcond *)(op + 1);
520 if (cond->port != -1 &&
521 cond->port != (op->code == INET_DIAG_BC_S_COND ?
522 entry->sport : entry->dport)) {
527 if (op->code == INET_DIAG_BC_S_COND)
532 if (cond->family != AF_UNSPEC &&
533 cond->family != entry->family) {
534 if (entry->family == AF_INET6 &&
535 cond->family == AF_INET) {
536 if (addr[0] == 0 && addr[1] == 0 &&
537 addr[2] == htonl(0xffff) &&
538 bitstring_match(addr + 3,
547 if (cond->prefix_len == 0)
549 if (bitstring_match(addr, cond->addr,
568 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
570 static void entry_fill_addrs(struct inet_diag_entry *entry,
571 const struct sock *sk)
573 #if IS_ENABLED(CONFIG_IPV6)
574 if (sk->sk_family == AF_INET6) {
575 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
576 entry->daddr = sk->sk_v6_daddr.s6_addr32;
580 entry->saddr = &sk->sk_rcv_saddr;
581 entry->daddr = &sk->sk_daddr;
585 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
587 struct inet_sock *inet = inet_sk(sk);
588 struct inet_diag_entry entry;
593 entry.family = sk->sk_family;
594 entry_fill_addrs(&entry, sk);
595 entry.sport = inet->inet_num;
596 entry.dport = ntohs(inet->inet_dport);
597 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
599 return inet_diag_bc_run(bc, &entry);
601 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
603 static int valid_cc(const void *bc, int len, int cc)
606 const struct inet_diag_bc_op *op = bc;
612 if (op->yes < 4 || op->yes & 3)
620 /* Validate an inet_diag_hostcond. */
621 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
624 struct inet_diag_hostcond *cond;
627 /* Check hostcond space. */
628 *min_len += sizeof(struct inet_diag_hostcond);
631 cond = (struct inet_diag_hostcond *)(op + 1);
633 /* Check address family and address length. */
634 switch (cond->family) {
639 addr_len = sizeof(struct in_addr);
642 addr_len = sizeof(struct in6_addr);
647 *min_len += addr_len;
651 /* Check prefix length (in bits) vs address length (in bytes). */
652 if (cond->prefix_len > 8 * addr_len)
658 /* Validate a port comparison operator. */
659 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
660 int len, int *min_len)
662 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
663 *min_len += sizeof(struct inet_diag_bc_op);
669 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
671 const void *bc = bytecode;
672 int len = bytecode_len;
675 int min_len = sizeof(struct inet_diag_bc_op);
676 const struct inet_diag_bc_op *op = bc;
679 case INET_DIAG_BC_S_COND:
680 case INET_DIAG_BC_D_COND:
681 if (!valid_hostcond(bc, len, &min_len))
684 case INET_DIAG_BC_S_GE:
685 case INET_DIAG_BC_S_LE:
686 case INET_DIAG_BC_D_GE:
687 case INET_DIAG_BC_D_LE:
688 if (!valid_port_comparison(bc, len, &min_len))
691 case INET_DIAG_BC_AUTO:
692 case INET_DIAG_BC_JMP:
693 case INET_DIAG_BC_NOP:
699 if (op->code != INET_DIAG_BC_NOP) {
700 if (op->no < min_len || op->no > len + 4 || op->no & 3)
703 !valid_cc(bytecode, bytecode_len, len - op->no))
707 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
712 return len == 0 ? 0 : -EINVAL;
715 static int inet_csk_diag_dump(struct sock *sk,
717 struct netlink_callback *cb,
718 const struct inet_diag_req_v2 *r,
719 const struct nlattr *bc)
721 if (!inet_diag_bc_sk(bc, sk))
724 return inet_csk_diag_fill(sk, skb, r,
725 sk_user_ns(NETLINK_CB(cb->skb).sk),
726 NETLINK_CB(cb->skb).portid,
727 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
730 static void twsk_build_assert(void)
732 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
733 offsetof(struct sock, sk_family));
735 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
736 offsetof(struct inet_sock, inet_num));
738 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
739 offsetof(struct inet_sock, inet_dport));
741 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
742 offsetof(struct inet_sock, inet_rcv_saddr));
744 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
745 offsetof(struct inet_sock, inet_daddr));
747 #if IS_ENABLED(CONFIG_IPV6)
748 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
749 offsetof(struct sock, sk_v6_rcv_saddr));
751 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
752 offsetof(struct sock, sk_v6_daddr));
756 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
757 struct netlink_callback *cb,
758 const struct inet_diag_req_v2 *r, struct nlattr *bc)
760 struct net *net = sock_net(skb->sk);
761 int i, num, s_i, s_num;
762 u32 idiag_states = r->idiag_states;
764 if (idiag_states & TCPF_SYN_RECV)
765 idiag_states |= TCPF_NEW_SYN_RECV;
767 s_num = num = cb->args[2];
769 if (cb->args[0] == 0) {
770 if (!(idiag_states & TCPF_LISTEN))
773 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
774 struct inet_listen_hashbucket *ilb;
775 struct hlist_nulls_node *node;
779 ilb = &hashinfo->listening_hash[i];
780 spin_lock_bh(&ilb->lock);
781 sk_nulls_for_each(sk, node, &ilb->head) {
782 struct inet_sock *inet = inet_sk(sk);
784 if (!net_eq(sock_net(sk), net))
792 if (r->sdiag_family != AF_UNSPEC &&
793 sk->sk_family != r->sdiag_family)
796 if (r->id.idiag_sport != inet->inet_sport &&
800 if (r->id.idiag_dport ||
804 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
805 spin_unlock_bh(&ilb->lock);
814 spin_unlock_bh(&ilb->lock);
822 s_i = num = s_num = 0;
825 if (!(idiag_states & ~TCPF_LISTEN))
828 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
829 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
830 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
831 struct hlist_nulls_node *node;
836 if (hlist_nulls_empty(&head->chain))
843 sk_nulls_for_each(sk, node, &head->chain) {
846 if (!net_eq(sock_net(sk), net))
850 state = (sk->sk_state == TCP_TIME_WAIT) ?
851 inet_twsk(sk)->tw_substate : sk->sk_state;
852 if (!(idiag_states & (1 << state)))
854 if (r->sdiag_family != AF_UNSPEC &&
855 sk->sk_family != r->sdiag_family)
857 if (r->id.idiag_sport != htons(sk->sk_num) &&
860 if (r->id.idiag_dport != sk->sk_dport &&
865 if (!inet_diag_bc_sk(bc, sk))
868 res = sk_diag_fill(sk, skb, r,
869 sk_user_ns(NETLINK_CB(cb->skb).sk),
870 NETLINK_CB(cb->skb).portid,
871 cb->nlh->nlmsg_seq, NLM_F_MULTI,
874 spin_unlock_bh(lock);
881 spin_unlock_bh(lock);
890 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
892 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
893 const struct inet_diag_req_v2 *r,
896 const struct inet_diag_handler *handler;
899 handler = inet_diag_lock_handler(r->sdiag_protocol);
900 if (!IS_ERR(handler))
901 handler->dump(skb, cb, r, bc);
903 err = PTR_ERR(handler);
904 inet_diag_unlock_handler(handler);
906 return err ? : skb->len;
909 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
911 int hdrlen = sizeof(struct inet_diag_req_v2);
912 struct nlattr *bc = NULL;
914 if (nlmsg_attrlen(cb->nlh, hdrlen))
915 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
917 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
920 static int inet_diag_type2proto(int type)
923 case TCPDIAG_GETSOCK:
925 case DCCPDIAG_GETSOCK:
932 static int inet_diag_dump_compat(struct sk_buff *skb,
933 struct netlink_callback *cb)
935 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
936 int hdrlen = sizeof(struct inet_diag_req);
937 struct inet_diag_req_v2 req;
938 struct nlattr *bc = NULL;
940 req.sdiag_family = AF_UNSPEC; /* compatibility */
941 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
942 req.idiag_ext = rc->idiag_ext;
943 req.idiag_states = rc->idiag_states;
946 if (nlmsg_attrlen(cb->nlh, hdrlen))
947 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
949 return __inet_diag_dump(skb, cb, &req, bc);
952 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
953 const struct nlmsghdr *nlh)
955 struct inet_diag_req *rc = nlmsg_data(nlh);
956 struct inet_diag_req_v2 req;
958 req.sdiag_family = rc->idiag_family;
959 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
960 req.idiag_ext = rc->idiag_ext;
961 req.idiag_states = rc->idiag_states;
964 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
967 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
969 int hdrlen = sizeof(struct inet_diag_req);
970 struct net *net = sock_net(skb->sk);
972 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
973 nlmsg_len(nlh) < hdrlen)
976 if (nlh->nlmsg_flags & NLM_F_DUMP) {
977 if (nlmsg_attrlen(nlh, hdrlen)) {
980 attr = nlmsg_find_attr(nlh, hdrlen,
981 INET_DIAG_REQ_BYTECODE);
983 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
984 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
988 struct netlink_dump_control c = {
989 .dump = inet_diag_dump_compat,
991 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
995 return inet_diag_get_exact_compat(skb, nlh);
998 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1000 int hdrlen = sizeof(struct inet_diag_req_v2);
1001 struct net *net = sock_net(skb->sk);
1003 if (nlmsg_len(h) < hdrlen)
1006 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1007 h->nlmsg_flags & NLM_F_DUMP) {
1008 if (nlmsg_attrlen(h, hdrlen)) {
1009 struct nlattr *attr;
1011 attr = nlmsg_find_attr(h, hdrlen,
1012 INET_DIAG_REQ_BYTECODE);
1014 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1015 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1019 struct netlink_dump_control c = {
1020 .dump = inet_diag_dump,
1022 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1026 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1030 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1032 const struct inet_diag_handler *handler;
1033 struct nlmsghdr *nlh;
1034 struct nlattr *attr;
1035 struct inet_diag_msg *r;
1039 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1043 r = nlmsg_data(nlh);
1044 memset(r, 0, sizeof(*r));
1045 inet_diag_msg_common_fill(r, sk);
1046 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1047 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1048 r->idiag_state = sk->sk_state;
1050 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1051 nlmsg_cancel(skb, nlh);
1055 handler = inet_diag_lock_handler(sk->sk_protocol);
1056 if (IS_ERR(handler)) {
1057 inet_diag_unlock_handler(handler);
1058 nlmsg_cancel(skb, nlh);
1059 return PTR_ERR(handler);
1062 attr = handler->idiag_info_size
1063 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1066 info = nla_data(attr);
1068 handler->idiag_get_info(sk, r, info);
1069 inet_diag_unlock_handler(handler);
1071 nlmsg_end(skb, nlh);
1075 static const struct sock_diag_handler inet_diag_handler = {
1077 .dump = inet_diag_handler_cmd,
1078 .get_info = inet_diag_handler_get_info,
1079 .destroy = inet_diag_handler_cmd,
1082 static const struct sock_diag_handler inet6_diag_handler = {
1084 .dump = inet_diag_handler_cmd,
1085 .get_info = inet_diag_handler_get_info,
1086 .destroy = inet_diag_handler_cmd,
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 */);