2 * udp_diag.c Module for monitoring UDP transport protocols sockets.
4 * Authors: Pavel Emelyanov, <xemul@parallels.com>
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.
13 #include <linux/module.h>
14 #include <linux/inet_diag.h>
15 #include <linux/udp.h>
17 #include <net/udplite.h>
18 #include <linux/inet_diag.h>
19 #include <linux/sock_diag.h>
21 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
22 struct netlink_callback *cb, struct inet_diag_req_v2 *req,
25 if (!inet_diag_bc_sk(bc, sk))
28 return inet_sk_diag_fill(sk, NULL, skb, req, NETLINK_CB(cb->skb).pid,
29 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
32 static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
33 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
39 if (req->sdiag_family == AF_INET)
40 sk = __udp4_lib_lookup(&init_net,
41 req->id.idiag_src[0], req->id.idiag_sport,
42 req->id.idiag_dst[0], req->id.idiag_dport,
43 req->id.idiag_if, tbl);
44 #if IS_ENABLED(CONFIG_IPV6)
45 else if (req->sdiag_family == AF_INET6)
46 sk = __udp6_lib_lookup(&init_net,
47 (struct in6_addr *)req->id.idiag_src,
49 (struct in6_addr *)req->id.idiag_dst,
51 req->id.idiag_if, tbl);
60 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
65 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
66 sizeof(struct inet_diag_meminfo) +
71 err = inet_sk_diag_fill(sk, NULL, rep, req,
72 NETLINK_CB(in_skb).pid,
73 nlh->nlmsg_seq, 0, nlh);
75 WARN_ON(err == -EMSGSIZE);
79 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
90 static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb,
91 struct inet_diag_req_v2 *r, struct nlattr *bc)
93 int num, s_num, slot, s_slot;
96 num = s_num = cb->args[1];
98 for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) {
100 struct hlist_nulls_node *node;
101 struct udp_hslot *hslot = &table->hash[slot];
103 if (hlist_nulls_empty(&hslot->head))
106 spin_lock_bh(&hslot->lock);
107 sk_nulls_for_each(sk, node, &hslot->head) {
108 struct inet_sock *inet = inet_sk(sk);
112 if (!(r->idiag_states & (1 << sk->sk_state)))
114 if (r->sdiag_family != AF_UNSPEC &&
115 sk->sk_family != r->sdiag_family)
117 if (r->id.idiag_sport != inet->inet_sport &&
120 if (r->id.idiag_dport != inet->inet_dport &&
124 if (sk_diag_dump(sk, skb, cb, r, bc) < 0) {
125 spin_unlock_bh(&hslot->lock);
131 spin_unlock_bh(&hslot->lock);
138 static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
139 struct inet_diag_req_v2 *r, struct nlattr *bc)
141 udp_dump(&udp_table, skb, cb, r, bc);
144 static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
145 struct inet_diag_req_v2 *req)
147 return udp_dump_one(&udp_table, in_skb, nlh, req);
150 static const struct inet_diag_handler udp_diag_handler = {
151 .dump = udp_diag_dump,
152 .dump_one = udp_diag_dump_one,
153 .idiag_type = IPPROTO_UDP,
156 static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
157 struct inet_diag_req_v2 *r, struct nlattr *bc)
159 udp_dump(&udplite_table, skb, cb, r, bc);
162 static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
163 struct inet_diag_req_v2 *req)
165 return udp_dump_one(&udplite_table, in_skb, nlh, req);
168 static const struct inet_diag_handler udplite_diag_handler = {
169 .dump = udplite_diag_dump,
170 .dump_one = udplite_diag_dump_one,
171 .idiag_type = IPPROTO_UDPLITE,
174 static int __init udp_diag_init(void)
178 err = inet_diag_register(&udp_diag_handler);
181 err = inet_diag_register(&udplite_diag_handler);
187 inet_diag_unregister(&udp_diag_handler);
191 static void __exit udp_diag_exit(void)
193 inet_diag_unregister(&udplite_diag_handler);
194 inet_diag_unregister(&udp_diag_handler);
197 module_init(udp_diag_init);
198 module_exit(udp_diag_exit);
199 MODULE_LICENSE("GPL");
200 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
201 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);