1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * udp_diag.c Module for monitoring UDP transport protocols sockets.
5 * Authors: Pavel Emelyanov, <xemul@parallels.com>
9 #include <linux/module.h>
10 #include <linux/inet_diag.h>
11 #include <linux/udp.h>
13 #include <net/udplite.h>
14 #include <linux/sock_diag.h>
16 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
17 struct netlink_callback *cb,
18 const struct inet_diag_req_v2 *req,
19 struct nlattr *bc, bool net_admin)
21 if (!inet_diag_bc_sk(bc, sk))
24 return inet_sk_diag_fill(sk, NULL, skb, cb, req, NLM_F_MULTI,
28 static int udp_dump_one(struct udp_table *tbl,
29 struct netlink_callback *cb,
30 const struct inet_diag_req_v2 *req)
32 struct sk_buff *in_skb = cb->skb;
34 struct sock *sk = NULL;
36 struct net *net = sock_net(in_skb->sk);
39 if (req->sdiag_family == AF_INET)
40 /* src and dst are swapped for historical reasons */
41 sk = __udp4_lib_lookup(net,
42 req->id.idiag_src[0], req->id.idiag_sport,
43 req->id.idiag_dst[0], req->id.idiag_dport,
44 req->id.idiag_if, 0, tbl, NULL);
45 #if IS_ENABLED(CONFIG_IPV6)
46 else if (req->sdiag_family == AF_INET6)
47 sk = __udp6_lib_lookup(net,
48 (struct in6_addr *)req->id.idiag_src,
50 (struct in6_addr *)req->id.idiag_dst,
52 req->id.idiag_if, 0, tbl, NULL);
54 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
61 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
66 rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
67 inet_diag_msg_attrs_size() +
68 nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
73 err = inet_sk_diag_fill(sk, NULL, rep, cb, req, 0,
74 netlink_net_capable(in_skb, CAP_NET_ADMIN));
76 WARN_ON(err == -EMSGSIZE);
80 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
91 static void udp_dump(struct udp_table *table, struct sk_buff *skb,
92 struct netlink_callback *cb,
93 const struct inet_diag_req_v2 *r)
95 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
96 struct net *net = sock_net(skb->sk);
97 struct inet_diag_dump_data *cb_data;
98 int num, s_num, slot, s_slot;
102 bc = cb_data->inet_diag_nla_bc;
103 s_slot = cb->args[0];
104 num = s_num = cb->args[1];
106 for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
107 struct udp_hslot *hslot = &table->hash[slot];
112 if (hlist_empty(&hslot->head))
115 spin_lock_bh(&hslot->lock);
116 sk_for_each(sk, &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, net_admin) < 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)
152 udp_dump(&udp_table, skb, cb, r);
155 static int udp_diag_dump_one(struct netlink_callback *cb,
156 const struct inet_diag_req_v2 *req)
158 return udp_dump_one(&udp_table, cb, req);
161 static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
164 r->idiag_rqueue = udp_rqueue_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, 0, tbl, NULL);
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[3], req->id.idiag_dport,
190 req->id.idiag_src[3], req->id.idiag_sport,
191 req->id.idiag_if, 0, tbl, NULL);
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, 0, tbl, NULL);
207 if (sk && !refcount_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)
255 udp_dump(&udplite_table, skb, cb, r);
258 static int udplite_diag_dump_one(struct netlink_callback *cb,
259 const struct inet_diag_req_v2 *req)
261 return udp_dump_one(&udplite_table, cb, req);
264 static const struct inet_diag_handler udplite_diag_handler = {
265 .dump = udplite_diag_dump,
266 .dump_one = udplite_diag_dump_one,
267 .idiag_get_info = udp_diag_get_info,
268 .idiag_type = IPPROTO_UDPLITE,
269 .idiag_info_size = 0,
270 #ifdef CONFIG_INET_DIAG_DESTROY
271 .destroy = udplite_diag_destroy,
275 static int __init udp_diag_init(void)
279 err = inet_diag_register(&udp_diag_handler);
282 err = inet_diag_register(&udplite_diag_handler);
288 inet_diag_unregister(&udp_diag_handler);
292 static void __exit udp_diag_exit(void)
294 inet_diag_unregister(&udplite_diag_handler);
295 inet_diag_unregister(&udp_diag_handler);
298 module_init(udp_diag_init);
299 module_exit(udp_diag_exit);
300 MODULE_LICENSE("GPL");
301 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
302 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);