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 {
51 static DEFINE_MUTEX(inet_diag_table_mutex);
53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
55 if (!inet_diag_table[proto])
56 sock_load_diag_module(AF_INET, proto);
58 mutex_lock(&inet_diag_table_mutex);
59 if (!inet_diag_table[proto])
60 return ERR_PTR(-ENOENT);
62 return inet_diag_table[proto];
65 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
67 mutex_unlock(&inet_diag_table_mutex);
70 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
72 r->idiag_family = sk->sk_family;
74 r->id.idiag_sport = htons(sk->sk_num);
75 r->id.idiag_dport = sk->sk_dport;
76 r->id.idiag_if = sk->sk_bound_dev_if;
77 sock_diag_save_cookie(sk, r->id.idiag_cookie);
79 #if IS_ENABLED(CONFIG_IPV6)
80 if (sk->sk_family == AF_INET6) {
81 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
82 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
86 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
87 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
89 r->id.idiag_src[0] = sk->sk_rcv_saddr;
90 r->id.idiag_dst[0] = sk->sk_daddr;
93 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
95 static size_t inet_sk_attr_size(struct sock *sk,
96 const struct inet_diag_req_v2 *req,
99 const struct inet_diag_handler *handler;
102 handler = inet_diag_table[req->sdiag_protocol];
103 if (handler && handler->idiag_get_aux_size)
104 aux = handler->idiag_get_aux_size(sk, net_admin);
106 return nla_total_size(sizeof(struct tcp_info))
107 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
108 + nla_total_size(1) /* INET_DIAG_TOS */
109 + nla_total_size(1) /* INET_DIAG_TCLASS */
110 + nla_total_size(4) /* INET_DIAG_MARK */
111 + nla_total_size(sizeof(struct inet_diag_meminfo))
112 + nla_total_size(sizeof(struct inet_diag_msg))
113 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
114 + nla_total_size(TCP_CA_NAME_MAX)
115 + nla_total_size(sizeof(struct tcpvegas_info))
120 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
121 struct inet_diag_msg *r, int ext,
122 struct user_namespace *user_ns,
125 const struct inet_sock *inet = inet_sk(sk);
127 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
130 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
131 * hence this needs to be included regardless of socket family.
133 if (ext & (1 << (INET_DIAG_TOS - 1)))
134 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
137 #if IS_ENABLED(CONFIG_IPV6)
138 if (r->idiag_family == AF_INET6) {
139 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
140 if (nla_put_u8(skb, INET_DIAG_TCLASS,
141 inet6_sk(sk)->tclass) < 0)
144 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
145 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
150 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
153 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
154 r->idiag_inode = sock_i_ino(sk);
160 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
162 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
163 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
164 struct user_namespace *user_ns,
165 u32 portid, u32 seq, u16 nlmsg_flags,
166 const struct nlmsghdr *unlh,
169 const struct tcp_congestion_ops *ca_ops;
170 const struct inet_diag_handler *handler;
171 int ext = req->idiag_ext;
172 struct inet_diag_msg *r;
173 struct nlmsghdr *nlh;
177 handler = inet_diag_table[req->sdiag_protocol];
180 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
186 BUG_ON(!sk_fullsock(sk));
188 inet_diag_msg_common_fill(r, sk);
189 r->idiag_state = sk->sk_state;
191 r->idiag_retrans = 0;
193 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
196 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
197 struct inet_diag_meminfo minfo = {
198 .idiag_rmem = sk_rmem_alloc_get(sk),
199 .idiag_wmem = sk->sk_wmem_queued,
200 .idiag_fmem = sk->sk_forward_alloc,
201 .idiag_tmem = sk_wmem_alloc_get(sk),
204 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
208 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
209 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
213 * RAW sockets might have user-defined protocols assigned,
214 * so report the one supplied on socket creation.
216 if (sk->sk_type == SOCK_RAW) {
217 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
222 handler->idiag_get_info(sk, r, NULL);
226 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
227 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
228 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
230 r->idiag_retrans = icsk->icsk_retransmits;
232 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
233 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
235 r->idiag_retrans = icsk->icsk_probes_out;
237 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
238 } else if (timer_pending(&sk->sk_timer)) {
240 r->idiag_retrans = icsk->icsk_probes_out;
242 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
245 r->idiag_expires = 0;
248 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
249 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
250 handler->idiag_info_size,
255 info = nla_data(attr);
258 if (ext & (1 << (INET_DIAG_CONG - 1))) {
262 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
264 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
270 handler->idiag_get_info(sk, r, info);
272 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
273 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
276 if (sk->sk_state < TCP_TIME_WAIT) {
277 union tcp_cc_info info;
282 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
283 if (ca_ops && ca_ops->get_info)
284 sz = ca_ops->get_info(sk, ext, &attr, &info);
286 if (sz && nla_put(skb, attr, sz, &info) < 0)
290 if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
293 #ifdef CONFIG_SOCK_CGROUP_DATA
294 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
297 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
306 nlmsg_cancel(skb, nlh);
309 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
311 static int inet_csk_diag_fill(struct sock *sk,
313 const struct inet_diag_req_v2 *req,
314 struct user_namespace *user_ns,
315 u32 portid, u32 seq, u16 nlmsg_flags,
316 const struct nlmsghdr *unlh,
319 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
320 portid, seq, nlmsg_flags, unlh, net_admin);
323 static int inet_twsk_diag_fill(struct sock *sk,
325 u32 portid, u32 seq, u16 nlmsg_flags,
326 const struct nlmsghdr *unlh)
328 struct inet_timewait_sock *tw = inet_twsk(sk);
329 struct inet_diag_msg *r;
330 struct nlmsghdr *nlh;
333 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
339 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
341 tmo = tw->tw_timer.expires - jiffies;
345 inet_diag_msg_common_fill(r, sk);
346 r->idiag_retrans = 0;
348 r->idiag_state = tw->tw_substate;
350 r->idiag_expires = jiffies_to_msecs(tmo);
360 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
361 u32 portid, u32 seq, u16 nlmsg_flags,
362 const struct nlmsghdr *unlh, bool net_admin)
364 struct request_sock *reqsk = inet_reqsk(sk);
365 struct inet_diag_msg *r;
366 struct nlmsghdr *nlh;
369 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
375 inet_diag_msg_common_fill(r, sk);
376 r->idiag_state = TCP_SYN_RECV;
378 r->idiag_retrans = reqsk->num_retrans;
380 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
381 offsetof(struct sock, sk_cookie));
383 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
384 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
390 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
391 inet_rsk(reqsk)->ir_mark))
398 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
399 const struct inet_diag_req_v2 *r,
400 struct user_namespace *user_ns,
401 u32 portid, u32 seq, u16 nlmsg_flags,
402 const struct nlmsghdr *unlh, bool net_admin)
404 if (sk->sk_state == TCP_TIME_WAIT)
405 return inet_twsk_diag_fill(sk, skb, portid, seq,
408 if (sk->sk_state == TCP_NEW_SYN_RECV)
409 return inet_req_diag_fill(sk, skb, portid, seq,
410 nlmsg_flags, unlh, net_admin);
412 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
413 nlmsg_flags, unlh, net_admin);
416 struct sock *inet_diag_find_one_icsk(struct net *net,
417 struct inet_hashinfo *hashinfo,
418 const struct inet_diag_req_v2 *req)
423 if (req->sdiag_family == AF_INET)
424 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
425 req->id.idiag_dport, req->id.idiag_src[0],
426 req->id.idiag_sport, req->id.idiag_if);
427 #if IS_ENABLED(CONFIG_IPV6)
428 else if (req->sdiag_family == AF_INET6) {
429 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
430 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
431 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
432 req->id.idiag_dport, req->id.idiag_src[3],
433 req->id.idiag_sport, req->id.idiag_if);
435 sk = inet6_lookup(net, hashinfo, NULL, 0,
436 (struct in6_addr *)req->id.idiag_dst,
438 (struct in6_addr *)req->id.idiag_src,
445 return ERR_PTR(-EINVAL);
449 return ERR_PTR(-ENOENT);
451 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
453 return ERR_PTR(-ENOENT);
458 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
460 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
461 struct sk_buff *in_skb,
462 const struct nlmsghdr *nlh,
463 const struct inet_diag_req_v2 *req)
465 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
466 struct net *net = sock_net(in_skb->sk);
471 sk = inet_diag_find_one_icsk(net, hashinfo, req);
475 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
481 err = sk_diag_fill(sk, rep, req,
482 sk_user_ns(NETLINK_CB(in_skb).sk),
483 NETLINK_CB(in_skb).portid,
484 nlh->nlmsg_seq, 0, nlh, net_admin);
486 WARN_ON(err == -EMSGSIZE);
490 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
501 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
503 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
504 const struct nlmsghdr *nlh,
505 const struct inet_diag_req_v2 *req)
507 const struct inet_diag_handler *handler;
510 handler = inet_diag_lock_handler(req->sdiag_protocol);
512 err = PTR_ERR(handler);
513 else if (cmd == SOCK_DIAG_BY_FAMILY)
514 err = handler->dump_one(in_skb, nlh, req);
515 else if (cmd == SOCK_DESTROY && handler->destroy)
516 err = handler->destroy(in_skb, req);
519 inet_diag_unlock_handler(handler);
524 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
526 int words = bits >> 5;
531 if (memcmp(a1, a2, words << 2))
541 mask = htonl((0xffffffff) << (32 - bits));
543 if ((w1 ^ w2) & mask)
550 static int inet_diag_bc_run(const struct nlattr *_bc,
551 const struct inet_diag_entry *entry)
553 const void *bc = nla_data(_bc);
554 int len = nla_len(_bc);
558 const struct inet_diag_bc_op *op = bc;
561 case INET_DIAG_BC_NOP:
563 case INET_DIAG_BC_JMP:
566 case INET_DIAG_BC_S_EQ:
567 yes = entry->sport == op[1].no;
569 case INET_DIAG_BC_S_GE:
570 yes = entry->sport >= op[1].no;
572 case INET_DIAG_BC_S_LE:
573 yes = entry->sport <= op[1].no;
575 case INET_DIAG_BC_D_EQ:
576 yes = entry->dport == op[1].no;
578 case INET_DIAG_BC_D_GE:
579 yes = entry->dport >= op[1].no;
581 case INET_DIAG_BC_D_LE:
582 yes = entry->dport <= op[1].no;
584 case INET_DIAG_BC_AUTO:
585 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
587 case INET_DIAG_BC_S_COND:
588 case INET_DIAG_BC_D_COND: {
589 const struct inet_diag_hostcond *cond;
592 cond = (const struct inet_diag_hostcond *)(op + 1);
593 if (cond->port != -1 &&
594 cond->port != (op->code == INET_DIAG_BC_S_COND ?
595 entry->sport : entry->dport)) {
600 if (op->code == INET_DIAG_BC_S_COND)
605 if (cond->family != AF_UNSPEC &&
606 cond->family != entry->family) {
607 if (entry->family == AF_INET6 &&
608 cond->family == AF_INET) {
609 if (addr[0] == 0 && addr[1] == 0 &&
610 addr[2] == htonl(0xffff) &&
611 bitstring_match(addr + 3,
620 if (cond->prefix_len == 0)
622 if (bitstring_match(addr, cond->addr,
628 case INET_DIAG_BC_DEV_COND: {
631 ifindex = *((const u32 *)(op + 1));
632 if (ifindex != entry->ifindex)
636 case INET_DIAG_BC_MARK_COND: {
637 struct inet_diag_markcond *cond;
639 cond = (struct inet_diag_markcond *)(op + 1);
640 if ((entry->mark & cond->mask) != cond->mark)
657 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
659 static void entry_fill_addrs(struct inet_diag_entry *entry,
660 const struct sock *sk)
662 #if IS_ENABLED(CONFIG_IPV6)
663 if (sk->sk_family == AF_INET6) {
664 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
665 entry->daddr = sk->sk_v6_daddr.s6_addr32;
669 entry->saddr = &sk->sk_rcv_saddr;
670 entry->daddr = &sk->sk_daddr;
674 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
676 struct inet_sock *inet = inet_sk(sk);
677 struct inet_diag_entry entry;
682 entry.family = sk->sk_family;
683 entry_fill_addrs(&entry, sk);
684 entry.sport = inet->inet_num;
685 entry.dport = ntohs(inet->inet_dport);
686 entry.ifindex = sk->sk_bound_dev_if;
687 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
689 entry.mark = sk->sk_mark;
690 else if (sk->sk_state == TCP_NEW_SYN_RECV)
691 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
695 return inet_diag_bc_run(bc, &entry);
697 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
699 static int valid_cc(const void *bc, int len, int cc)
702 const struct inet_diag_bc_op *op = bc;
708 if (op->yes < 4 || op->yes & 3)
716 /* data is u32 ifindex */
717 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
720 /* Check ifindex space. */
721 *min_len += sizeof(u32);
727 /* Validate an inet_diag_hostcond. */
728 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
731 struct inet_diag_hostcond *cond;
734 /* Check hostcond space. */
735 *min_len += sizeof(struct inet_diag_hostcond);
738 cond = (struct inet_diag_hostcond *)(op + 1);
740 /* Check address family and address length. */
741 switch (cond->family) {
746 addr_len = sizeof(struct in_addr);
749 addr_len = sizeof(struct in6_addr);
754 *min_len += addr_len;
758 /* Check prefix length (in bits) vs address length (in bytes). */
759 if (cond->prefix_len > 8 * addr_len)
765 /* Validate a port comparison operator. */
766 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
767 int len, int *min_len)
769 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
770 *min_len += sizeof(struct inet_diag_bc_op);
776 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
779 *min_len += sizeof(struct inet_diag_markcond);
780 return len >= *min_len;
783 static int inet_diag_bc_audit(const struct nlattr *attr,
784 const struct sk_buff *skb)
786 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
787 const void *bytecode, *bc;
788 int bytecode_len, len;
790 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
793 bytecode = bc = nla_data(attr);
794 len = bytecode_len = nla_len(attr);
797 int min_len = sizeof(struct inet_diag_bc_op);
798 const struct inet_diag_bc_op *op = bc;
801 case INET_DIAG_BC_S_COND:
802 case INET_DIAG_BC_D_COND:
803 if (!valid_hostcond(bc, len, &min_len))
806 case INET_DIAG_BC_DEV_COND:
807 if (!valid_devcond(bc, len, &min_len))
810 case INET_DIAG_BC_S_EQ:
811 case INET_DIAG_BC_S_GE:
812 case INET_DIAG_BC_S_LE:
813 case INET_DIAG_BC_D_EQ:
814 case INET_DIAG_BC_D_GE:
815 case INET_DIAG_BC_D_LE:
816 if (!valid_port_comparison(bc, len, &min_len))
819 case INET_DIAG_BC_MARK_COND:
822 if (!valid_markcond(bc, len, &min_len))
825 case INET_DIAG_BC_AUTO:
826 case INET_DIAG_BC_JMP:
827 case INET_DIAG_BC_NOP:
833 if (op->code != INET_DIAG_BC_NOP) {
834 if (op->no < min_len || op->no > len + 4 || op->no & 3)
837 !valid_cc(bytecode, bytecode_len, len - op->no))
841 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
846 return len == 0 ? 0 : -EINVAL;
849 static int inet_csk_diag_dump(struct sock *sk,
851 struct netlink_callback *cb,
852 const struct inet_diag_req_v2 *r,
853 const struct nlattr *bc,
856 if (!inet_diag_bc_sk(bc, sk))
859 return inet_csk_diag_fill(sk, skb, r,
860 sk_user_ns(NETLINK_CB(cb->skb).sk),
861 NETLINK_CB(cb->skb).portid,
862 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
866 static void twsk_build_assert(void)
868 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
869 offsetof(struct sock, sk_family));
871 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
872 offsetof(struct inet_sock, inet_num));
874 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
875 offsetof(struct inet_sock, inet_dport));
877 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
878 offsetof(struct inet_sock, inet_rcv_saddr));
880 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
881 offsetof(struct inet_sock, inet_daddr));
883 #if IS_ENABLED(CONFIG_IPV6)
884 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
885 offsetof(struct sock, sk_v6_rcv_saddr));
887 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
888 offsetof(struct sock, sk_v6_daddr));
892 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
893 struct netlink_callback *cb,
894 const struct inet_diag_req_v2 *r, struct nlattr *bc)
896 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
897 struct net *net = sock_net(skb->sk);
898 u32 idiag_states = r->idiag_states;
899 int i, num, s_i, s_num;
902 if (idiag_states & TCPF_SYN_RECV)
903 idiag_states |= TCPF_NEW_SYN_RECV;
905 s_num = num = cb->args[2];
907 if (cb->args[0] == 0) {
908 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
911 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
912 struct inet_listen_hashbucket *ilb;
915 ilb = &hashinfo->listening_hash[i];
916 spin_lock(&ilb->lock);
917 sk_for_each(sk, &ilb->head) {
918 struct inet_sock *inet = inet_sk(sk);
920 if (!net_eq(sock_net(sk), net))
928 if (r->sdiag_family != AF_UNSPEC &&
929 sk->sk_family != r->sdiag_family)
932 if (r->id.idiag_sport != inet->inet_sport &&
936 if (inet_csk_diag_dump(sk, skb, cb, r,
937 bc, net_admin) < 0) {
938 spin_unlock(&ilb->lock);
945 spin_unlock(&ilb->lock);
951 s_i = num = s_num = 0;
954 if (!(idiag_states & ~TCPF_LISTEN))
958 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
959 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
960 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
961 struct hlist_nulls_node *node;
962 struct sock *sk_arr[SKARR_SZ];
963 int num_arr[SKARR_SZ];
966 if (hlist_nulls_empty(&head->chain))
976 sk_nulls_for_each(sk, node, &head->chain) {
979 if (!net_eq(sock_net(sk), net))
983 state = (sk->sk_state == TCP_TIME_WAIT) ?
984 inet_twsk(sk)->tw_substate : sk->sk_state;
985 if (!(idiag_states & (1 << state)))
987 if (r->sdiag_family != AF_UNSPEC &&
988 sk->sk_family != r->sdiag_family)
990 if (r->id.idiag_sport != htons(sk->sk_num) &&
993 if (r->id.idiag_dport != sk->sk_dport &&
998 if (!inet_diag_bc_sk(bc, sk))
1002 num_arr[accum] = num;
1004 if (++accum == SKARR_SZ)
1009 spin_unlock_bh(lock);
1011 for (idx = 0; idx < accum; idx++) {
1013 res = sk_diag_fill(sk_arr[idx], skb, r,
1014 sk_user_ns(NETLINK_CB(cb->skb).sk),
1015 NETLINK_CB(cb->skb).portid,
1016 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1017 cb->nlh, net_admin);
1021 sock_gen_put(sk_arr[idx]);
1026 if (accum == SKARR_SZ) {
1038 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1040 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1041 const struct inet_diag_req_v2 *r,
1044 const struct inet_diag_handler *handler;
1047 handler = inet_diag_lock_handler(r->sdiag_protocol);
1048 if (!IS_ERR(handler))
1049 handler->dump(skb, cb, r, bc);
1051 err = PTR_ERR(handler);
1052 inet_diag_unlock_handler(handler);
1054 return err ? : skb->len;
1057 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1059 int hdrlen = sizeof(struct inet_diag_req_v2);
1060 struct nlattr *bc = NULL;
1062 if (nlmsg_attrlen(cb->nlh, hdrlen))
1063 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1065 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1068 static int inet_diag_type2proto(int type)
1071 case TCPDIAG_GETSOCK:
1073 case DCCPDIAG_GETSOCK:
1074 return IPPROTO_DCCP;
1080 static int inet_diag_dump_compat(struct sk_buff *skb,
1081 struct netlink_callback *cb)
1083 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1084 int hdrlen = sizeof(struct inet_diag_req);
1085 struct inet_diag_req_v2 req;
1086 struct nlattr *bc = NULL;
1088 req.sdiag_family = AF_UNSPEC; /* compatibility */
1089 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1090 req.idiag_ext = rc->idiag_ext;
1091 req.idiag_states = rc->idiag_states;
1094 if (nlmsg_attrlen(cb->nlh, hdrlen))
1095 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1097 return __inet_diag_dump(skb, cb, &req, bc);
1100 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1101 const struct nlmsghdr *nlh)
1103 struct inet_diag_req *rc = nlmsg_data(nlh);
1104 struct inet_diag_req_v2 req;
1106 req.sdiag_family = rc->idiag_family;
1107 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1108 req.idiag_ext = rc->idiag_ext;
1109 req.idiag_states = rc->idiag_states;
1112 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1115 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1117 int hdrlen = sizeof(struct inet_diag_req);
1118 struct net *net = sock_net(skb->sk);
1120 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1121 nlmsg_len(nlh) < hdrlen)
1124 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1125 if (nlmsg_attrlen(nlh, hdrlen)) {
1126 struct nlattr *attr;
1129 attr = nlmsg_find_attr(nlh, hdrlen,
1130 INET_DIAG_REQ_BYTECODE);
1131 err = inet_diag_bc_audit(attr, skb);
1136 struct netlink_dump_control c = {
1137 .dump = inet_diag_dump_compat,
1139 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1143 return inet_diag_get_exact_compat(skb, nlh);
1146 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1148 int hdrlen = sizeof(struct inet_diag_req_v2);
1149 struct net *net = sock_net(skb->sk);
1151 if (nlmsg_len(h) < hdrlen)
1154 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1155 h->nlmsg_flags & NLM_F_DUMP) {
1156 if (nlmsg_attrlen(h, hdrlen)) {
1157 struct nlattr *attr;
1160 attr = nlmsg_find_attr(h, hdrlen,
1161 INET_DIAG_REQ_BYTECODE);
1162 err = inet_diag_bc_audit(attr, skb);
1167 struct netlink_dump_control c = {
1168 .dump = inet_diag_dump,
1170 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1174 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1178 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1180 const struct inet_diag_handler *handler;
1181 struct nlmsghdr *nlh;
1182 struct nlattr *attr;
1183 struct inet_diag_msg *r;
1187 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1191 r = nlmsg_data(nlh);
1192 memset(r, 0, sizeof(*r));
1193 inet_diag_msg_common_fill(r, sk);
1194 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1195 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1196 r->idiag_state = sk->sk_state;
1198 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1199 nlmsg_cancel(skb, nlh);
1203 handler = inet_diag_lock_handler(sk->sk_protocol);
1204 if (IS_ERR(handler)) {
1205 inet_diag_unlock_handler(handler);
1206 nlmsg_cancel(skb, nlh);
1207 return PTR_ERR(handler);
1210 attr = handler->idiag_info_size
1211 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1212 handler->idiag_info_size,
1216 info = nla_data(attr);
1218 handler->idiag_get_info(sk, r, info);
1219 inet_diag_unlock_handler(handler);
1221 nlmsg_end(skb, nlh);
1225 static const struct sock_diag_handler inet_diag_handler = {
1227 .dump = inet_diag_handler_cmd,
1228 .get_info = inet_diag_handler_get_info,
1229 .destroy = inet_diag_handler_cmd,
1232 static const struct sock_diag_handler inet6_diag_handler = {
1234 .dump = inet_diag_handler_cmd,
1235 .get_info = inet_diag_handler_get_info,
1236 .destroy = inet_diag_handler_cmd,
1239 int inet_diag_register(const struct inet_diag_handler *h)
1241 const __u16 type = h->idiag_type;
1244 if (type >= IPPROTO_MAX)
1247 mutex_lock(&inet_diag_table_mutex);
1249 if (!inet_diag_table[type]) {
1250 inet_diag_table[type] = h;
1253 mutex_unlock(&inet_diag_table_mutex);
1257 EXPORT_SYMBOL_GPL(inet_diag_register);
1259 void inet_diag_unregister(const struct inet_diag_handler *h)
1261 const __u16 type = h->idiag_type;
1263 if (type >= IPPROTO_MAX)
1266 mutex_lock(&inet_diag_table_mutex);
1267 inet_diag_table[type] = NULL;
1268 mutex_unlock(&inet_diag_table_mutex);
1270 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1272 static int __init inet_diag_init(void)
1274 const int inet_diag_table_size = (IPPROTO_MAX *
1275 sizeof(struct inet_diag_handler *));
1278 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1279 if (!inet_diag_table)
1282 err = sock_diag_register(&inet_diag_handler);
1286 err = sock_diag_register(&inet6_diag_handler);
1290 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1295 sock_diag_unregister(&inet_diag_handler);
1297 kfree(inet_diag_table);
1301 static void __exit inet_diag_exit(void)
1303 sock_diag_unregister(&inet6_diag_handler);
1304 sock_diag_unregister(&inet_diag_handler);
1305 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1306 kfree(inet_diag_table);
1309 module_init(inet_diag_init);
1310 module_exit(inet_diag_exit);
1311 MODULE_LICENSE("GPL");
1312 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1313 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);