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(sizeof(struct inet_diag_msg) +
67 sizeof(struct inet_diag_meminfo) + 64,
72 err = inet_sk_diag_fill(sk, NULL, rep, cb, req, 0,
73 netlink_net_capable(in_skb, CAP_NET_ADMIN));
75 WARN_ON(err == -EMSGSIZE);
79 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
90 static void udp_dump(struct udp_table *table, struct sk_buff *skb,
91 struct netlink_callback *cb,
92 const struct inet_diag_req_v2 *r)
94 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
95 struct net *net = sock_net(skb->sk);
96 struct inet_diag_dump_data *cb_data;
97 int num, s_num, slot, s_slot;
101 bc = cb_data->inet_diag_nla_bc;
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++) {
106 struct udp_hslot *hslot = &table->hash[slot];
111 if (hlist_empty(&hslot->head))
114 spin_lock_bh(&hslot->lock);
115 sk_for_each(sk, &hslot->head) {
116 struct inet_sock *inet = inet_sk(sk);
118 if (!net_eq(sock_net(sk), net))
122 if (!(r->idiag_states & (1 << sk->sk_state)))
124 if (r->sdiag_family != AF_UNSPEC &&
125 sk->sk_family != r->sdiag_family)
127 if (r->id.idiag_sport != inet->inet_sport &&
130 if (r->id.idiag_dport != inet->inet_dport &&
134 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
135 spin_unlock_bh(&hslot->lock);
141 spin_unlock_bh(&hslot->lock);
148 static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
149 const struct inet_diag_req_v2 *r)
151 udp_dump(&udp_table, skb, cb, r);
154 static int udp_diag_dump_one(struct netlink_callback *cb,
155 const struct inet_diag_req_v2 *req)
157 return udp_dump_one(&udp_table, cb, req);
160 static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
163 r->idiag_rqueue = udp_rqueue_get(sk);
164 r->idiag_wqueue = sk_wmem_alloc_get(sk);
167 #ifdef CONFIG_INET_DIAG_DESTROY
168 static int __udp_diag_destroy(struct sk_buff *in_skb,
169 const struct inet_diag_req_v2 *req,
170 struct udp_table *tbl)
172 struct net *net = sock_net(in_skb->sk);
178 if (req->sdiag_family == AF_INET)
179 sk = __udp4_lib_lookup(net,
180 req->id.idiag_dst[0], req->id.idiag_dport,
181 req->id.idiag_src[0], req->id.idiag_sport,
182 req->id.idiag_if, 0, tbl, NULL);
183 #if IS_ENABLED(CONFIG_IPV6)
184 else if (req->sdiag_family == AF_INET6) {
185 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
186 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
187 sk = __udp4_lib_lookup(net,
188 req->id.idiag_dst[3], req->id.idiag_dport,
189 req->id.idiag_src[3], req->id.idiag_sport,
190 req->id.idiag_if, 0, tbl, NULL);
193 sk = __udp6_lib_lookup(net,
194 (struct in6_addr *)req->id.idiag_dst,
196 (struct in6_addr *)req->id.idiag_src,
198 req->id.idiag_if, 0, tbl, NULL);
206 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
214 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
219 err = sock_diag_destroy(sk, ECONNABORTED);
226 static int udp_diag_destroy(struct sk_buff *in_skb,
227 const struct inet_diag_req_v2 *req)
229 return __udp_diag_destroy(in_skb, req, &udp_table);
232 static int udplite_diag_destroy(struct sk_buff *in_skb,
233 const struct inet_diag_req_v2 *req)
235 return __udp_diag_destroy(in_skb, req, &udplite_table);
240 static const struct inet_diag_handler udp_diag_handler = {
241 .dump = udp_diag_dump,
242 .dump_one = udp_diag_dump_one,
243 .idiag_get_info = udp_diag_get_info,
244 .idiag_type = IPPROTO_UDP,
245 .idiag_info_size = 0,
246 #ifdef CONFIG_INET_DIAG_DESTROY
247 .destroy = udp_diag_destroy,
251 static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
252 const struct inet_diag_req_v2 *r)
254 udp_dump(&udplite_table, skb, cb, r);
257 static int udplite_diag_dump_one(struct netlink_callback *cb,
258 const struct inet_diag_req_v2 *req)
260 return udp_dump_one(&udplite_table, cb, req);
263 static const struct inet_diag_handler udplite_diag_handler = {
264 .dump = udplite_diag_dump,
265 .dump_one = udplite_diag_dump_one,
266 .idiag_get_info = udp_diag_get_info,
267 .idiag_type = IPPROTO_UDPLITE,
268 .idiag_info_size = 0,
269 #ifdef CONFIG_INET_DIAG_DESTROY
270 .destroy = udplite_diag_destroy,
274 static int __init udp_diag_init(void)
278 err = inet_diag_register(&udp_diag_handler);
281 err = inet_diag_register(&udplite_diag_handler);
287 inet_diag_unregister(&udp_diag_handler);
291 static void __exit udp_diag_exit(void)
293 inet_diag_unregister(&udplite_diag_handler);
294 inet_diag_unregister(&udp_diag_handler);
297 module_init(udp_diag_init);
298 module_exit(udp_diag_exit);
299 MODULE_LICENSE("GPL");
300 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
301 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);