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/sock_diag.h>
20 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
21 struct netlink_callback *cb,
22 const struct inet_diag_req_v2 *req,
25 if (!inet_diag_bc_sk(bc, sk))
28 return inet_sk_diag_fill(sk, NULL, skb, req,
29 sk_user_ns(NETLINK_CB(cb->skb).sk),
30 NETLINK_CB(cb->skb).portid,
31 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
34 static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
35 const struct nlmsghdr *nlh,
36 const struct inet_diag_req_v2 *req)
41 struct net *net = sock_net(in_skb->sk);
43 if (req->sdiag_family == AF_INET)
44 sk = __udp4_lib_lookup(net,
45 req->id.idiag_src[0], req->id.idiag_sport,
46 req->id.idiag_dst[0], req->id.idiag_dport,
47 req->id.idiag_if, tbl);
48 #if IS_ENABLED(CONFIG_IPV6)
49 else if (req->sdiag_family == AF_INET6)
50 sk = __udp6_lib_lookup(net,
51 (struct in6_addr *)req->id.idiag_src,
53 (struct in6_addr *)req->id.idiag_dst,
55 req->id.idiag_if, tbl);
64 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
69 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
70 sizeof(struct inet_diag_meminfo) + 64,
75 err = inet_sk_diag_fill(sk, NULL, rep, req,
76 sk_user_ns(NETLINK_CB(in_skb).sk),
77 NETLINK_CB(in_skb).portid,
78 nlh->nlmsg_seq, 0, nlh);
80 WARN_ON(err == -EMSGSIZE);
84 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
95 static void udp_dump(struct udp_table *table, struct sk_buff *skb,
96 struct netlink_callback *cb,
97 const struct inet_diag_req_v2 *r, struct nlattr *bc)
99 int num, s_num, slot, s_slot;
100 struct net *net = sock_net(skb->sk);
102 s_slot = cb->args[0];
103 num = s_num = cb->args[1];
105 for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
107 struct hlist_nulls_node *node;
108 struct udp_hslot *hslot = &table->hash[slot];
112 if (hlist_nulls_empty(&hslot->head))
115 spin_lock_bh(&hslot->lock);
116 sk_nulls_for_each(sk, node, &hslot->head) {
117 struct inet_sock *inet = inet_sk(sk);
119 if (!net_eq(sock_net(sk), net))
123 if (!(r->idiag_states & (1 << sk->sk_state)))
125 if (r->sdiag_family != AF_UNSPEC &&
126 sk->sk_family != r->sdiag_family)
128 if (r->id.idiag_sport != inet->inet_sport &&
131 if (r->id.idiag_dport != inet->inet_dport &&
135 if (sk_diag_dump(sk, skb, cb, r, bc) < 0) {
136 spin_unlock_bh(&hslot->lock);
142 spin_unlock_bh(&hslot->lock);
149 static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
150 const struct inet_diag_req_v2 *r, struct nlattr *bc)
152 udp_dump(&udp_table, skb, cb, r, bc);
155 static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
156 const struct inet_diag_req_v2 *req)
158 return udp_dump_one(&udp_table, in_skb, nlh, req);
161 static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
164 r->idiag_rqueue = sk_rmem_alloc_get(sk);
165 r->idiag_wqueue = sk_wmem_alloc_get(sk);
168 #ifdef CONFIG_INET_DIAG_DESTROY
169 static int __udp_diag_destroy(struct sk_buff *in_skb,
170 const struct inet_diag_req_v2 *req,
171 struct udp_table *tbl)
173 struct net *net = sock_net(in_skb->sk);
179 if (req->sdiag_family == AF_INET)
180 sk = __udp4_lib_lookup(net,
181 req->id.idiag_dst[0], req->id.idiag_dport,
182 req->id.idiag_src[0], req->id.idiag_sport,
183 req->id.idiag_if, tbl);
184 #if IS_ENABLED(CONFIG_IPV6)
185 else if (req->sdiag_family == AF_INET6) {
186 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
187 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
188 sk = __udp4_lib_lookup(net,
189 req->id.idiag_dst[0], req->id.idiag_dport,
190 req->id.idiag_src[0], req->id.idiag_sport,
191 req->id.idiag_if, tbl);
194 sk = __udp6_lib_lookup(net,
195 (struct in6_addr *)req->id.idiag_dst,
197 (struct in6_addr *)req->id.idiag_src,
199 req->id.idiag_if, tbl);
207 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
215 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
220 err = sock_diag_destroy(sk, ECONNABORTED);
227 static int udp_diag_destroy(struct sk_buff *in_skb,
228 const struct inet_diag_req_v2 *req)
230 return __udp_diag_destroy(in_skb, req, &udp_table);
233 static int udplite_diag_destroy(struct sk_buff *in_skb,
234 const struct inet_diag_req_v2 *req)
236 return __udp_diag_destroy(in_skb, req, &udplite_table);
241 static const struct inet_diag_handler udp_diag_handler = {
242 .dump = udp_diag_dump,
243 .dump_one = udp_diag_dump_one,
244 .idiag_get_info = udp_diag_get_info,
245 .idiag_type = IPPROTO_UDP,
246 .idiag_info_size = 0,
247 #ifdef CONFIG_INET_DIAG_DESTROY
248 .destroy = udp_diag_destroy,
252 static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
253 const struct inet_diag_req_v2 *r,
256 udp_dump(&udplite_table, skb, cb, r, bc);
259 static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
260 const struct inet_diag_req_v2 *req)
262 return udp_dump_one(&udplite_table, in_skb, nlh, req);
265 static const struct inet_diag_handler udplite_diag_handler = {
266 .dump = udplite_diag_dump,
267 .dump_one = udplite_diag_dump_one,
268 .idiag_get_info = udp_diag_get_info,
269 .idiag_type = IPPROTO_UDPLITE,
270 .idiag_info_size = 0,
271 #ifdef CONFIG_INET_DIAG_DESTROY
272 .destroy = udplite_diag_destroy,
276 static int __init udp_diag_init(void)
280 err = inet_diag_register(&udp_diag_handler);
283 err = inet_diag_register(&udplite_diag_handler);
289 inet_diag_unregister(&udp_diag_handler);
293 static void __exit udp_diag_exit(void)
295 inet_diag_unregister(&udplite_diag_handler);
296 inet_diag_unregister(&udp_diag_handler);
299 module_init(udp_diag_init);
300 module_exit(udp_diag_exit);
301 MODULE_LICENSE("GPL");
302 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
303 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);