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Pavel Emelyanov52b7c592011-12-09 06:23:51 +00001/*
2 * udp_diag.c Module for monitoring UDP transport protocols sockets.
3 *
4 * Authors: Pavel Emelyanov, <xemul@parallels.com>
5 *
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.
10 */
11
12
13#include <linux/module.h>
14#include <linux/inet_diag.h>
15#include <linux/udp.h>
16#include <net/udp.h>
17#include <net/udplite.h>
Pavel Emelyanov52b7c592011-12-09 06:23:51 +000018#include <linux/sock_diag.h>
19
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +000020static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
Eric Dumazet34160ea2015-03-10 07:15:54 -070021 struct netlink_callback *cb,
22 const struct inet_diag_req_v2 *req,
23 struct nlattr *bc)
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +000024{
25 if (!inet_diag_bc_sk(bc, sk))
26 return 0;
27
Eric W. Biedermand06ca952012-05-24 17:58:08 -060028 return inet_sk_diag_fill(sk, NULL, skb, req,
Patrick McHardye32123e2013-04-17 06:46:57 +000029 sk_user_ns(NETLINK_CB(cb->skb).sk),
Eric W. Biederman15e47302012-09-07 20:12:54 +000030 NETLINK_CB(cb->skb).portid,
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +000031 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
32}
33
Pavel Emelyanov52b7c592011-12-09 06:23:51 +000034static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
Eric Dumazet34160ea2015-03-10 07:15:54 -070035 const struct nlmsghdr *nlh,
36 const struct inet_diag_req_v2 *req)
Pavel Emelyanov52b7c592011-12-09 06:23:51 +000037{
Pavel Emelyanova925aa02011-12-09 06:24:06 +000038 int err = -EINVAL;
39 struct sock *sk;
40 struct sk_buff *rep;
Andrey Vagin51d7ccc2012-07-16 04:28:49 +000041 struct net *net = sock_net(in_skb->sk);
Pavel Emelyanova925aa02011-12-09 06:24:06 +000042
43 if (req->sdiag_family == AF_INET)
Andrey Vagin51d7ccc2012-07-16 04:28:49 +000044 sk = __udp4_lib_lookup(net,
Pavel Emelyanova925aa02011-12-09 06:24:06 +000045 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);
Pavel Emelyanov86e62ad2011-12-09 23:35:07 +000048#if IS_ENABLED(CONFIG_IPV6)
Pavel Emelyanova925aa02011-12-09 06:24:06 +000049 else if (req->sdiag_family == AF_INET6)
Andrey Vagin51d7ccc2012-07-16 04:28:49 +000050 sk = __udp6_lib_lookup(net,
Pavel Emelyanova925aa02011-12-09 06:24:06 +000051 (struct in6_addr *)req->id.idiag_src,
52 req->id.idiag_sport,
53 (struct in6_addr *)req->id.idiag_dst,
54 req->id.idiag_dport,
55 req->id.idiag_if, tbl);
Pavel Emelyanov86e62ad2011-12-09 23:35:07 +000056#endif
Pavel Emelyanova925aa02011-12-09 06:24:06 +000057 else
58 goto out_nosk;
59
60 err = -ENOENT;
Ian Morris51456b22015-04-03 09:17:26 +010061 if (!sk)
Pavel Emelyanova925aa02011-12-09 06:24:06 +000062 goto out_nosk;
63
Pavel Emelyanovf65c1b52011-12-15 02:43:44 +000064 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
Pavel Emelyanova925aa02011-12-09 06:24:06 +000065 if (err)
66 goto out;
67
68 err = -ENOMEM;
Hong zhi guo573ce262013-03-27 06:47:04 +000069 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
70 sizeof(struct inet_diag_meminfo) + 64,
71 GFP_KERNEL);
Pavel Emelyanova925aa02011-12-09 06:24:06 +000072 if (!rep)
73 goto out;
74
75 err = inet_sk_diag_fill(sk, NULL, rep, req,
Patrick McHardye32123e2013-04-17 06:46:57 +000076 sk_user_ns(NETLINK_CB(in_skb).sk),
Eric W. Biederman15e47302012-09-07 20:12:54 +000077 NETLINK_CB(in_skb).portid,
Pavel Emelyanova925aa02011-12-09 06:24:06 +000078 nlh->nlmsg_seq, 0, nlh);
79 if (err < 0) {
80 WARN_ON(err == -EMSGSIZE);
81 kfree_skb(rep);
82 goto out;
83 }
Eric W. Biederman15e47302012-09-07 20:12:54 +000084 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
Pavel Emelyanova925aa02011-12-09 06:24:06 +000085 MSG_DONTWAIT);
86 if (err > 0)
87 err = 0;
88out:
89 if (sk)
90 sock_put(sk);
91out_nosk:
92 return err;
Pavel Emelyanov52b7c592011-12-09 06:23:51 +000093}
94
Eric Dumazet34160ea2015-03-10 07:15:54 -070095static 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)
Pavel Emelyanov52b7c592011-12-09 06:23:51 +000098{
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +000099 int num, s_num, slot, s_slot;
Andrey Vagin51d7ccc2012-07-16 04:28:49 +0000100 struct net *net = sock_net(skb->sk);
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +0000101
102 s_slot = cb->args[0];
103 num = s_num = cb->args[1];
104
Herbert Xu86f3cdd2015-01-24 08:02:40 +1100105 for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +0000106 struct sock *sk;
107 struct hlist_nulls_node *node;
108 struct udp_hslot *hslot = &table->hash[slot];
109
Herbert Xu86f3cdd2015-01-24 08:02:40 +1100110 num = 0;
111
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +0000112 if (hlist_nulls_empty(&hslot->head))
113 continue;
114
115 spin_lock_bh(&hslot->lock);
116 sk_nulls_for_each(sk, node, &hslot->head) {
117 struct inet_sock *inet = inet_sk(sk);
118
Andrey Vagin51d7ccc2012-07-16 04:28:49 +0000119 if (!net_eq(sock_net(sk), net))
120 continue;
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +0000121 if (num < s_num)
122 goto next;
123 if (!(r->idiag_states & (1 << sk->sk_state)))
124 goto next;
125 if (r->sdiag_family != AF_UNSPEC &&
126 sk->sk_family != r->sdiag_family)
127 goto next;
128 if (r->id.idiag_sport != inet->inet_sport &&
129 r->id.idiag_sport)
130 goto next;
131 if (r->id.idiag_dport != inet->inet_dport &&
132 r->id.idiag_dport)
133 goto next;
134
135 if (sk_diag_dump(sk, skb, cb, r, bc) < 0) {
136 spin_unlock_bh(&hslot->lock);
137 goto done;
138 }
139next:
140 num++;
141 }
142 spin_unlock_bh(&hslot->lock);
143 }
144done:
145 cb->args[0] = slot;
146 cb->args[1] = num;
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000147}
148
149static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
Eric Dumazet34160ea2015-03-10 07:15:54 -0700150 const struct inet_diag_req_v2 *r, struct nlattr *bc)
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000151{
152 udp_dump(&udp_table, skb, cb, r, bc);
153}
154
155static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
Eric Dumazet34160ea2015-03-10 07:15:54 -0700156 const struct inet_diag_req_v2 *req)
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000157{
158 return udp_dump_one(&udp_table, in_skb, nlh, req);
159}
160
Shan Wei62ad6fc2012-04-24 18:15:41 +0000161static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
162 void *info)
163{
164 r->idiag_rqueue = sk_rmem_alloc_get(sk);
165 r->idiag_wqueue = sk_wmem_alloc_get(sk);
166}
167
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000168static const struct inet_diag_handler udp_diag_handler = {
169 .dump = udp_diag_dump,
170 .dump_one = udp_diag_dump_one,
Shan Wei62ad6fc2012-04-24 18:15:41 +0000171 .idiag_get_info = udp_diag_get_info,
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000172 .idiag_type = IPPROTO_UDP,
173};
174
175static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
Eric Dumazet34160ea2015-03-10 07:15:54 -0700176 const struct inet_diag_req_v2 *r,
177 struct nlattr *bc)
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000178{
179 udp_dump(&udplite_table, skb, cb, r, bc);
180}
181
182static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
Eric Dumazet34160ea2015-03-10 07:15:54 -0700183 const struct inet_diag_req_v2 *req)
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000184{
185 return udp_dump_one(&udplite_table, in_skb, nlh, req);
186}
187
188static const struct inet_diag_handler udplite_diag_handler = {
189 .dump = udplite_diag_dump,
190 .dump_one = udplite_diag_dump_one,
Shan Wei62ad6fc2012-04-24 18:15:41 +0000191 .idiag_get_info = udp_diag_get_info,
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000192 .idiag_type = IPPROTO_UDPLITE,
193};
194
195static int __init udp_diag_init(void)
196{
197 int err;
198
199 err = inet_diag_register(&udp_diag_handler);
200 if (err)
201 goto out;
202 err = inet_diag_register(&udplite_diag_handler);
203 if (err)
204 goto out_lite;
205out:
206 return err;
207out_lite:
208 inet_diag_unregister(&udp_diag_handler);
209 goto out;
210}
211
212static void __exit udp_diag_exit(void)
213{
214 inet_diag_unregister(&udplite_diag_handler);
215 inet_diag_unregister(&udp_diag_handler);
216}
217
218module_init(udp_diag_init);
219module_exit(udp_diag_exit);
220MODULE_LICENSE("GPL");
Pavel Emelyanovaec8dc62011-12-15 02:43:27 +0000221MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
222MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);