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,
23 struct nlattr *bc, bool net_admin)
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, net_admin);
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)
39 struct sock *sk = NULL;
41 struct net *net = sock_net(in_skb->sk);
44 if (req->sdiag_family == AF_INET)
45 sk = __udp4_lib_lookup(net,
46 req->id.idiag_src[0], req->id.idiag_sport,
47 req->id.idiag_dst[0], req->id.idiag_dport,
48 req->id.idiag_if, 0, tbl, NULL);
49 #if IS_ENABLED(CONFIG_IPV6)
50 else if (req->sdiag_family == AF_INET6)
51 sk = __udp6_lib_lookup(net,
52 (struct in6_addr *)req->id.idiag_src,
54 (struct in6_addr *)req->id.idiag_dst,
56 req->id.idiag_if, 0, tbl, NULL);
58 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
65 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
70 rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
71 inet_diag_msg_attrs_size() +
72 nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
77 err = inet_sk_diag_fill(sk, NULL, rep, req,
78 sk_user_ns(NETLINK_CB(in_skb).sk),
79 NETLINK_CB(in_skb).portid,
80 nlh->nlmsg_seq, 0, nlh,
81 netlink_net_capable(in_skb, CAP_NET_ADMIN));
83 WARN_ON(err == -EMSGSIZE);
87 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
98 static void udp_dump(struct udp_table *table, struct sk_buff *skb,
99 struct netlink_callback *cb,
100 const struct inet_diag_req_v2 *r, struct nlattr *bc)
102 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
103 struct net *net = sock_net(skb->sk);
104 int num, s_num, slot, s_slot;
106 s_slot = cb->args[0];
107 num = s_num = cb->args[1];
109 for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
110 struct udp_hslot *hslot = &table->hash[slot];
115 if (hlist_empty(&hslot->head))
118 spin_lock_bh(&hslot->lock);
119 sk_for_each(sk, &hslot->head) {
120 struct inet_sock *inet = inet_sk(sk);
122 if (!net_eq(sock_net(sk), net))
126 if (!(r->idiag_states & (1 << sk->sk_state)))
128 if (r->sdiag_family != AF_UNSPEC &&
129 sk->sk_family != r->sdiag_family)
131 if (r->id.idiag_sport != inet->inet_sport &&
134 if (r->id.idiag_dport != inet->inet_dport &&
138 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
139 spin_unlock_bh(&hslot->lock);
145 spin_unlock_bh(&hslot->lock);
152 static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
153 const struct inet_diag_req_v2 *r, struct nlattr *bc)
155 udp_dump(&udp_table, skb, cb, r, bc);
158 static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
159 const struct inet_diag_req_v2 *req)
161 return udp_dump_one(&udp_table, in_skb, nlh, req);
164 static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
167 r->idiag_rqueue = udp_rqueue_get(sk);
168 r->idiag_wqueue = sk_wmem_alloc_get(sk);
171 #ifdef CONFIG_INET_DIAG_DESTROY
172 static int __udp_diag_destroy(struct sk_buff *in_skb,
173 const struct inet_diag_req_v2 *req,
174 struct udp_table *tbl)
176 struct net *net = sock_net(in_skb->sk);
182 if (req->sdiag_family == AF_INET)
183 sk = __udp4_lib_lookup(net,
184 req->id.idiag_dst[0], req->id.idiag_dport,
185 req->id.idiag_src[0], req->id.idiag_sport,
186 req->id.idiag_if, 0, tbl, NULL);
187 #if IS_ENABLED(CONFIG_IPV6)
188 else if (req->sdiag_family == AF_INET6) {
189 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
190 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
191 sk = __udp4_lib_lookup(net,
192 req->id.idiag_dst[3], req->id.idiag_dport,
193 req->id.idiag_src[3], req->id.idiag_sport,
194 req->id.idiag_if, 0, tbl, NULL);
197 sk = __udp6_lib_lookup(net,
198 (struct in6_addr *)req->id.idiag_dst,
200 (struct in6_addr *)req->id.idiag_src,
202 req->id.idiag_if, 0, tbl, NULL);
210 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
218 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
223 err = sock_diag_destroy(sk, ECONNABORTED);
230 static int udp_diag_destroy(struct sk_buff *in_skb,
231 const struct inet_diag_req_v2 *req)
233 return __udp_diag_destroy(in_skb, req, &udp_table);
236 static int udplite_diag_destroy(struct sk_buff *in_skb,
237 const struct inet_diag_req_v2 *req)
239 return __udp_diag_destroy(in_skb, req, &udplite_table);
244 static const struct inet_diag_handler udp_diag_handler = {
245 .dump = udp_diag_dump,
246 .dump_one = udp_diag_dump_one,
247 .idiag_get_info = udp_diag_get_info,
248 .idiag_type = IPPROTO_UDP,
249 .idiag_info_size = 0,
250 #ifdef CONFIG_INET_DIAG_DESTROY
251 .destroy = udp_diag_destroy,
255 static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
256 const struct inet_diag_req_v2 *r,
259 udp_dump(&udplite_table, skb, cb, r, bc);
262 static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
263 const struct inet_diag_req_v2 *req)
265 return udp_dump_one(&udplite_table, in_skb, nlh, req);
268 static const struct inet_diag_handler udplite_diag_handler = {
269 .dump = udplite_diag_dump,
270 .dump_one = udplite_diag_dump_one,
271 .idiag_get_info = udp_diag_get_info,
272 .idiag_type = IPPROTO_UDPLITE,
273 .idiag_info_size = 0,
274 #ifdef CONFIG_INET_DIAG_DESTROY
275 .destroy = udplite_diag_destroy,
279 static int __init udp_diag_init(void)
283 err = inet_diag_register(&udp_diag_handler);
286 err = inet_diag_register(&udplite_diag_handler);
292 inet_diag_unregister(&udp_diag_handler);
296 static void __exit udp_diag_exit(void)
298 inet_diag_unregister(&udplite_diag_handler);
299 inet_diag_unregister(&udp_diag_handler);
302 module_init(udp_diag_init);
303 module_exit(udp_diag_exit);
304 MODULE_LICENSE("GPL");
305 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
306 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);