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(4) /* INET_DIAG_CLASS_ID */
112 + nla_total_size(sizeof(struct inet_diag_meminfo))
113 + nla_total_size(sizeof(struct inet_diag_msg))
114 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
115 + nla_total_size(TCP_CA_NAME_MAX)
116 + nla_total_size(sizeof(struct tcpvegas_info))
121 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
122 struct inet_diag_msg *r, int ext,
123 struct user_namespace *user_ns,
126 const struct inet_sock *inet = inet_sk(sk);
128 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
131 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
132 * hence this needs to be included regardless of socket family.
134 if (ext & (1 << (INET_DIAG_TOS - 1)))
135 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
138 #if IS_ENABLED(CONFIG_IPV6)
139 if (r->idiag_family == AF_INET6) {
140 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
141 if (nla_put_u8(skb, INET_DIAG_TCLASS,
142 inet6_sk(sk)->tclass) < 0)
145 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
146 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
151 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
154 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
155 r->idiag_inode = sock_i_ino(sk);
161 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
163 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
164 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
165 struct user_namespace *user_ns,
166 u32 portid, u32 seq, u16 nlmsg_flags,
167 const struct nlmsghdr *unlh,
170 const struct tcp_congestion_ops *ca_ops;
171 const struct inet_diag_handler *handler;
172 int ext = req->idiag_ext;
173 struct inet_diag_msg *r;
174 struct nlmsghdr *nlh;
178 handler = inet_diag_table[req->sdiag_protocol];
181 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
187 BUG_ON(!sk_fullsock(sk));
189 inet_diag_msg_common_fill(r, sk);
190 r->idiag_state = sk->sk_state;
192 r->idiag_retrans = 0;
194 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
197 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
198 struct inet_diag_meminfo minfo = {
199 .idiag_rmem = sk_rmem_alloc_get(sk),
200 .idiag_wmem = sk->sk_wmem_queued,
201 .idiag_fmem = sk->sk_forward_alloc,
202 .idiag_tmem = sk_wmem_alloc_get(sk),
205 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
209 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
210 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
214 * RAW sockets might have user-defined protocols assigned,
215 * so report the one supplied on socket creation.
217 if (sk->sk_type == SOCK_RAW) {
218 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
223 handler->idiag_get_info(sk, r, NULL);
227 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
228 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
229 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
231 r->idiag_retrans = icsk->icsk_retransmits;
233 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
234 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
236 r->idiag_retrans = icsk->icsk_probes_out;
238 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
239 } else if (timer_pending(&sk->sk_timer)) {
241 r->idiag_retrans = icsk->icsk_probes_out;
243 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
246 r->idiag_expires = 0;
249 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
250 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
251 handler->idiag_info_size,
256 info = nla_data(attr);
259 if (ext & (1 << (INET_DIAG_CONG - 1))) {
263 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
265 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
271 handler->idiag_get_info(sk, r, info);
273 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
274 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
277 if (sk->sk_state < TCP_TIME_WAIT) {
278 union tcp_cc_info info;
283 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
284 if (ca_ops && ca_ops->get_info)
285 sz = ca_ops->get_info(sk, ext, &attr, &info);
287 if (sz && nla_put(skb, attr, sz, &info) < 0)
291 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
292 ext & (1 << (INET_DIAG_TCLASS - 1))) {
295 #ifdef CONFIG_SOCK_CGROUP_DATA
296 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
298 /* Fallback to socket priority if class id isn't set.
299 * Classful qdiscs use it as direct reference to class.
300 * For cgroup2 classid is always zero.
303 classid = sk->sk_priority;
305 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
314 nlmsg_cancel(skb, nlh);
317 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
319 static int inet_csk_diag_fill(struct sock *sk,
321 const struct inet_diag_req_v2 *req,
322 struct user_namespace *user_ns,
323 u32 portid, u32 seq, u16 nlmsg_flags,
324 const struct nlmsghdr *unlh,
327 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
328 portid, seq, nlmsg_flags, unlh, net_admin);
331 static int inet_twsk_diag_fill(struct sock *sk,
333 u32 portid, u32 seq, u16 nlmsg_flags,
334 const struct nlmsghdr *unlh)
336 struct inet_timewait_sock *tw = inet_twsk(sk);
337 struct inet_diag_msg *r;
338 struct nlmsghdr *nlh;
341 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
347 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
349 tmo = tw->tw_timer.expires - jiffies;
353 inet_diag_msg_common_fill(r, sk);
354 r->idiag_retrans = 0;
356 r->idiag_state = tw->tw_substate;
358 r->idiag_expires = jiffies_to_msecs(tmo);
368 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
369 u32 portid, u32 seq, u16 nlmsg_flags,
370 const struct nlmsghdr *unlh, bool net_admin)
372 struct request_sock *reqsk = inet_reqsk(sk);
373 struct inet_diag_msg *r;
374 struct nlmsghdr *nlh;
377 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
383 inet_diag_msg_common_fill(r, sk);
384 r->idiag_state = TCP_SYN_RECV;
386 r->idiag_retrans = reqsk->num_retrans;
388 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
389 offsetof(struct sock, sk_cookie));
391 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
392 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
398 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
399 inet_rsk(reqsk)->ir_mark))
406 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
407 const struct inet_diag_req_v2 *r,
408 struct user_namespace *user_ns,
409 u32 portid, u32 seq, u16 nlmsg_flags,
410 const struct nlmsghdr *unlh, bool net_admin)
412 if (sk->sk_state == TCP_TIME_WAIT)
413 return inet_twsk_diag_fill(sk, skb, portid, seq,
416 if (sk->sk_state == TCP_NEW_SYN_RECV)
417 return inet_req_diag_fill(sk, skb, portid, seq,
418 nlmsg_flags, unlh, net_admin);
420 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
421 nlmsg_flags, unlh, net_admin);
424 struct sock *inet_diag_find_one_icsk(struct net *net,
425 struct inet_hashinfo *hashinfo,
426 const struct inet_diag_req_v2 *req)
431 if (req->sdiag_family == AF_INET)
432 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
433 req->id.idiag_dport, req->id.idiag_src[0],
434 req->id.idiag_sport, req->id.idiag_if);
435 #if IS_ENABLED(CONFIG_IPV6)
436 else if (req->sdiag_family == AF_INET6) {
437 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
438 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
439 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
440 req->id.idiag_dport, req->id.idiag_src[3],
441 req->id.idiag_sport, req->id.idiag_if);
443 sk = inet6_lookup(net, hashinfo, NULL, 0,
444 (struct in6_addr *)req->id.idiag_dst,
446 (struct in6_addr *)req->id.idiag_src,
453 return ERR_PTR(-EINVAL);
457 return ERR_PTR(-ENOENT);
459 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
461 return ERR_PTR(-ENOENT);
466 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
468 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
469 struct sk_buff *in_skb,
470 const struct nlmsghdr *nlh,
471 const struct inet_diag_req_v2 *req)
473 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
474 struct net *net = sock_net(in_skb->sk);
479 sk = inet_diag_find_one_icsk(net, hashinfo, req);
483 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
489 err = sk_diag_fill(sk, rep, req,
490 sk_user_ns(NETLINK_CB(in_skb).sk),
491 NETLINK_CB(in_skb).portid,
492 nlh->nlmsg_seq, 0, nlh, net_admin);
494 WARN_ON(err == -EMSGSIZE);
498 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
509 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
511 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
512 const struct nlmsghdr *nlh,
513 const struct inet_diag_req_v2 *req)
515 const struct inet_diag_handler *handler;
518 handler = inet_diag_lock_handler(req->sdiag_protocol);
520 err = PTR_ERR(handler);
521 else if (cmd == SOCK_DIAG_BY_FAMILY)
522 err = handler->dump_one(in_skb, nlh, req);
523 else if (cmd == SOCK_DESTROY && handler->destroy)
524 err = handler->destroy(in_skb, req);
527 inet_diag_unlock_handler(handler);
532 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
534 int words = bits >> 5;
539 if (memcmp(a1, a2, words << 2))
549 mask = htonl((0xffffffff) << (32 - bits));
551 if ((w1 ^ w2) & mask)
558 static int inet_diag_bc_run(const struct nlattr *_bc,
559 const struct inet_diag_entry *entry)
561 const void *bc = nla_data(_bc);
562 int len = nla_len(_bc);
566 const struct inet_diag_bc_op *op = bc;
569 case INET_DIAG_BC_NOP:
571 case INET_DIAG_BC_JMP:
574 case INET_DIAG_BC_S_EQ:
575 yes = entry->sport == op[1].no;
577 case INET_DIAG_BC_S_GE:
578 yes = entry->sport >= op[1].no;
580 case INET_DIAG_BC_S_LE:
581 yes = entry->sport <= op[1].no;
583 case INET_DIAG_BC_D_EQ:
584 yes = entry->dport == op[1].no;
586 case INET_DIAG_BC_D_GE:
587 yes = entry->dport >= op[1].no;
589 case INET_DIAG_BC_D_LE:
590 yes = entry->dport <= op[1].no;
592 case INET_DIAG_BC_AUTO:
593 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
595 case INET_DIAG_BC_S_COND:
596 case INET_DIAG_BC_D_COND: {
597 const struct inet_diag_hostcond *cond;
600 cond = (const struct inet_diag_hostcond *)(op + 1);
601 if (cond->port != -1 &&
602 cond->port != (op->code == INET_DIAG_BC_S_COND ?
603 entry->sport : entry->dport)) {
608 if (op->code == INET_DIAG_BC_S_COND)
613 if (cond->family != AF_UNSPEC &&
614 cond->family != entry->family) {
615 if (entry->family == AF_INET6 &&
616 cond->family == AF_INET) {
617 if (addr[0] == 0 && addr[1] == 0 &&
618 addr[2] == htonl(0xffff) &&
619 bitstring_match(addr + 3,
628 if (cond->prefix_len == 0)
630 if (bitstring_match(addr, cond->addr,
636 case INET_DIAG_BC_DEV_COND: {
639 ifindex = *((const u32 *)(op + 1));
640 if (ifindex != entry->ifindex)
644 case INET_DIAG_BC_MARK_COND: {
645 struct inet_diag_markcond *cond;
647 cond = (struct inet_diag_markcond *)(op + 1);
648 if ((entry->mark & cond->mask) != cond->mark)
665 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
667 static void entry_fill_addrs(struct inet_diag_entry *entry,
668 const struct sock *sk)
670 #if IS_ENABLED(CONFIG_IPV6)
671 if (sk->sk_family == AF_INET6) {
672 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
673 entry->daddr = sk->sk_v6_daddr.s6_addr32;
677 entry->saddr = &sk->sk_rcv_saddr;
678 entry->daddr = &sk->sk_daddr;
682 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
684 struct inet_sock *inet = inet_sk(sk);
685 struct inet_diag_entry entry;
690 entry.family = sk->sk_family;
691 entry_fill_addrs(&entry, sk);
692 entry.sport = inet->inet_num;
693 entry.dport = ntohs(inet->inet_dport);
694 entry.ifindex = sk->sk_bound_dev_if;
695 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
697 entry.mark = sk->sk_mark;
698 else if (sk->sk_state == TCP_NEW_SYN_RECV)
699 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
703 return inet_diag_bc_run(bc, &entry);
705 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
707 static int valid_cc(const void *bc, int len, int cc)
710 const struct inet_diag_bc_op *op = bc;
716 if (op->yes < 4 || op->yes & 3)
724 /* data is u32 ifindex */
725 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
728 /* Check ifindex space. */
729 *min_len += sizeof(u32);
735 /* Validate an inet_diag_hostcond. */
736 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
739 struct inet_diag_hostcond *cond;
742 /* Check hostcond space. */
743 *min_len += sizeof(struct inet_diag_hostcond);
746 cond = (struct inet_diag_hostcond *)(op + 1);
748 /* Check address family and address length. */
749 switch (cond->family) {
754 addr_len = sizeof(struct in_addr);
757 addr_len = sizeof(struct in6_addr);
762 *min_len += addr_len;
766 /* Check prefix length (in bits) vs address length (in bytes). */
767 if (cond->prefix_len > 8 * addr_len)
773 /* Validate a port comparison operator. */
774 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
775 int len, int *min_len)
777 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
778 *min_len += sizeof(struct inet_diag_bc_op);
784 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
787 *min_len += sizeof(struct inet_diag_markcond);
788 return len >= *min_len;
791 static int inet_diag_bc_audit(const struct nlattr *attr,
792 const struct sk_buff *skb)
794 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
795 const void *bytecode, *bc;
796 int bytecode_len, len;
798 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
801 bytecode = bc = nla_data(attr);
802 len = bytecode_len = nla_len(attr);
805 int min_len = sizeof(struct inet_diag_bc_op);
806 const struct inet_diag_bc_op *op = bc;
809 case INET_DIAG_BC_S_COND:
810 case INET_DIAG_BC_D_COND:
811 if (!valid_hostcond(bc, len, &min_len))
814 case INET_DIAG_BC_DEV_COND:
815 if (!valid_devcond(bc, len, &min_len))
818 case INET_DIAG_BC_S_EQ:
819 case INET_DIAG_BC_S_GE:
820 case INET_DIAG_BC_S_LE:
821 case INET_DIAG_BC_D_EQ:
822 case INET_DIAG_BC_D_GE:
823 case INET_DIAG_BC_D_LE:
824 if (!valid_port_comparison(bc, len, &min_len))
827 case INET_DIAG_BC_MARK_COND:
830 if (!valid_markcond(bc, len, &min_len))
833 case INET_DIAG_BC_AUTO:
834 case INET_DIAG_BC_JMP:
835 case INET_DIAG_BC_NOP:
841 if (op->code != INET_DIAG_BC_NOP) {
842 if (op->no < min_len || op->no > len + 4 || op->no & 3)
845 !valid_cc(bytecode, bytecode_len, len - op->no))
849 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
854 return len == 0 ? 0 : -EINVAL;
857 static int inet_csk_diag_dump(struct sock *sk,
859 struct netlink_callback *cb,
860 const struct inet_diag_req_v2 *r,
861 const struct nlattr *bc,
864 if (!inet_diag_bc_sk(bc, sk))
867 return inet_csk_diag_fill(sk, skb, r,
868 sk_user_ns(NETLINK_CB(cb->skb).sk),
869 NETLINK_CB(cb->skb).portid,
870 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
874 static void twsk_build_assert(void)
876 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
877 offsetof(struct sock, sk_family));
879 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
880 offsetof(struct inet_sock, inet_num));
882 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
883 offsetof(struct inet_sock, inet_dport));
885 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
886 offsetof(struct inet_sock, inet_rcv_saddr));
888 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
889 offsetof(struct inet_sock, inet_daddr));
891 #if IS_ENABLED(CONFIG_IPV6)
892 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
893 offsetof(struct sock, sk_v6_rcv_saddr));
895 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
896 offsetof(struct sock, sk_v6_daddr));
900 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
901 struct netlink_callback *cb,
902 const struct inet_diag_req_v2 *r, struct nlattr *bc)
904 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
905 struct net *net = sock_net(skb->sk);
906 u32 idiag_states = r->idiag_states;
907 int i, num, s_i, s_num;
910 if (idiag_states & TCPF_SYN_RECV)
911 idiag_states |= TCPF_NEW_SYN_RECV;
913 s_num = num = cb->args[2];
915 if (cb->args[0] == 0) {
916 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
919 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
920 struct inet_listen_hashbucket *ilb;
923 ilb = &hashinfo->listening_hash[i];
924 spin_lock(&ilb->lock);
925 sk_for_each(sk, &ilb->head) {
926 struct inet_sock *inet = inet_sk(sk);
928 if (!net_eq(sock_net(sk), net))
936 if (r->sdiag_family != AF_UNSPEC &&
937 sk->sk_family != r->sdiag_family)
940 if (r->id.idiag_sport != inet->inet_sport &&
944 if (inet_csk_diag_dump(sk, skb, cb, r,
945 bc, net_admin) < 0) {
946 spin_unlock(&ilb->lock);
953 spin_unlock(&ilb->lock);
959 s_i = num = s_num = 0;
962 if (!(idiag_states & ~TCPF_LISTEN))
966 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
967 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
968 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
969 struct hlist_nulls_node *node;
970 struct sock *sk_arr[SKARR_SZ];
971 int num_arr[SKARR_SZ];
974 if (hlist_nulls_empty(&head->chain))
984 sk_nulls_for_each(sk, node, &head->chain) {
987 if (!net_eq(sock_net(sk), net))
991 state = (sk->sk_state == TCP_TIME_WAIT) ?
992 inet_twsk(sk)->tw_substate : sk->sk_state;
993 if (!(idiag_states & (1 << state)))
995 if (r->sdiag_family != AF_UNSPEC &&
996 sk->sk_family != r->sdiag_family)
998 if (r->id.idiag_sport != htons(sk->sk_num) &&
1001 if (r->id.idiag_dport != sk->sk_dport &&
1004 twsk_build_assert();
1006 if (!inet_diag_bc_sk(bc, sk))
1009 if (!refcount_inc_not_zero(&sk->sk_refcnt))
1012 num_arr[accum] = num;
1014 if (++accum == SKARR_SZ)
1019 spin_unlock_bh(lock);
1021 for (idx = 0; idx < accum; idx++) {
1023 res = sk_diag_fill(sk_arr[idx], skb, r,
1024 sk_user_ns(NETLINK_CB(cb->skb).sk),
1025 NETLINK_CB(cb->skb).portid,
1026 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1027 cb->nlh, net_admin);
1031 sock_gen_put(sk_arr[idx]);
1036 if (accum == SKARR_SZ) {
1048 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1050 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1051 const struct inet_diag_req_v2 *r,
1054 const struct inet_diag_handler *handler;
1057 handler = inet_diag_lock_handler(r->sdiag_protocol);
1058 if (!IS_ERR(handler))
1059 handler->dump(skb, cb, r, bc);
1061 err = PTR_ERR(handler);
1062 inet_diag_unlock_handler(handler);
1064 return err ? : skb->len;
1067 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1069 int hdrlen = sizeof(struct inet_diag_req_v2);
1070 struct nlattr *bc = NULL;
1072 if (nlmsg_attrlen(cb->nlh, hdrlen))
1073 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1075 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1078 static int inet_diag_type2proto(int type)
1081 case TCPDIAG_GETSOCK:
1083 case DCCPDIAG_GETSOCK:
1084 return IPPROTO_DCCP;
1090 static int inet_diag_dump_compat(struct sk_buff *skb,
1091 struct netlink_callback *cb)
1093 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1094 int hdrlen = sizeof(struct inet_diag_req);
1095 struct inet_diag_req_v2 req;
1096 struct nlattr *bc = NULL;
1098 req.sdiag_family = AF_UNSPEC; /* compatibility */
1099 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1100 req.idiag_ext = rc->idiag_ext;
1101 req.idiag_states = rc->idiag_states;
1104 if (nlmsg_attrlen(cb->nlh, hdrlen))
1105 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1107 return __inet_diag_dump(skb, cb, &req, bc);
1110 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1111 const struct nlmsghdr *nlh)
1113 struct inet_diag_req *rc = nlmsg_data(nlh);
1114 struct inet_diag_req_v2 req;
1116 req.sdiag_family = rc->idiag_family;
1117 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1118 req.idiag_ext = rc->idiag_ext;
1119 req.idiag_states = rc->idiag_states;
1122 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1125 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1127 int hdrlen = sizeof(struct inet_diag_req);
1128 struct net *net = sock_net(skb->sk);
1130 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1131 nlmsg_len(nlh) < hdrlen)
1134 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1135 if (nlmsg_attrlen(nlh, hdrlen)) {
1136 struct nlattr *attr;
1139 attr = nlmsg_find_attr(nlh, hdrlen,
1140 INET_DIAG_REQ_BYTECODE);
1141 err = inet_diag_bc_audit(attr, skb);
1146 struct netlink_dump_control c = {
1147 .dump = inet_diag_dump_compat,
1149 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1153 return inet_diag_get_exact_compat(skb, nlh);
1156 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1158 int hdrlen = sizeof(struct inet_diag_req_v2);
1159 struct net *net = sock_net(skb->sk);
1161 if (nlmsg_len(h) < hdrlen)
1164 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1165 h->nlmsg_flags & NLM_F_DUMP) {
1166 if (nlmsg_attrlen(h, hdrlen)) {
1167 struct nlattr *attr;
1170 attr = nlmsg_find_attr(h, hdrlen,
1171 INET_DIAG_REQ_BYTECODE);
1172 err = inet_diag_bc_audit(attr, skb);
1177 struct netlink_dump_control c = {
1178 .dump = inet_diag_dump,
1180 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1184 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1188 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1190 const struct inet_diag_handler *handler;
1191 struct nlmsghdr *nlh;
1192 struct nlattr *attr;
1193 struct inet_diag_msg *r;
1197 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1201 r = nlmsg_data(nlh);
1202 memset(r, 0, sizeof(*r));
1203 inet_diag_msg_common_fill(r, sk);
1204 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1205 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1206 r->idiag_state = sk->sk_state;
1208 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1209 nlmsg_cancel(skb, nlh);
1213 handler = inet_diag_lock_handler(sk->sk_protocol);
1214 if (IS_ERR(handler)) {
1215 inet_diag_unlock_handler(handler);
1216 nlmsg_cancel(skb, nlh);
1217 return PTR_ERR(handler);
1220 attr = handler->idiag_info_size
1221 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1222 handler->idiag_info_size,
1226 info = nla_data(attr);
1228 handler->idiag_get_info(sk, r, info);
1229 inet_diag_unlock_handler(handler);
1231 nlmsg_end(skb, nlh);
1235 static const struct sock_diag_handler inet_diag_handler = {
1237 .dump = inet_diag_handler_cmd,
1238 .get_info = inet_diag_handler_get_info,
1239 .destroy = inet_diag_handler_cmd,
1242 static const struct sock_diag_handler inet6_diag_handler = {
1244 .dump = inet_diag_handler_cmd,
1245 .get_info = inet_diag_handler_get_info,
1246 .destroy = inet_diag_handler_cmd,
1249 int inet_diag_register(const struct inet_diag_handler *h)
1251 const __u16 type = h->idiag_type;
1254 if (type >= IPPROTO_MAX)
1257 mutex_lock(&inet_diag_table_mutex);
1259 if (!inet_diag_table[type]) {
1260 inet_diag_table[type] = h;
1263 mutex_unlock(&inet_diag_table_mutex);
1267 EXPORT_SYMBOL_GPL(inet_diag_register);
1269 void inet_diag_unregister(const struct inet_diag_handler *h)
1271 const __u16 type = h->idiag_type;
1273 if (type >= IPPROTO_MAX)
1276 mutex_lock(&inet_diag_table_mutex);
1277 inet_diag_table[type] = NULL;
1278 mutex_unlock(&inet_diag_table_mutex);
1280 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1282 static int __init inet_diag_init(void)
1284 const int inet_diag_table_size = (IPPROTO_MAX *
1285 sizeof(struct inet_diag_handler *));
1288 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1289 if (!inet_diag_table)
1292 err = sock_diag_register(&inet_diag_handler);
1296 err = sock_diag_register(&inet6_diag_handler);
1300 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1305 sock_diag_unregister(&inet_diag_handler);
1307 kfree(inet_diag_table);
1311 static void __exit inet_diag_exit(void)
1313 sock_diag_unregister(&inet6_diag_handler);
1314 sock_diag_unregister(&inet_diag_handler);
1315 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1316 kfree(inet_diag_table);
1319 module_init(inet_diag_init);
1320 module_exit(inet_diag_exit);
1321 MODULE_LICENSE("GPL");
1322 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1323 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);