blob: 27910c133019b35bb5397222b6612df4d5164b63 [file] [log] [blame]
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>
18#include <linux/inet_diag.h>
19#include <linux/sock_diag.h>
20
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +000021static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
22 struct netlink_callback *cb, struct inet_diag_req *req,
23 struct nlattr *bc)
24{
25 if (!inet_diag_bc_sk(bc, sk))
26 return 0;
27
28 return inet_sk_diag_fill(sk, NULL, skb, req, NETLINK_CB(cb->skb).pid,
29 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
30}
31
Pavel Emelyanov52b7c592011-12-09 06:23:51 +000032static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
33 const struct nlmsghdr *nlh, struct inet_diag_req *req)
34{
Pavel Emelyanova925aa02011-12-09 06:24:06 +000035 int err = -EINVAL;
36 struct sock *sk;
37 struct sk_buff *rep;
38
39 if (req->sdiag_family == AF_INET)
40 sk = __udp4_lib_lookup(&init_net,
41 req->id.idiag_src[0], req->id.idiag_sport,
42 req->id.idiag_dst[0], req->id.idiag_dport,
43 req->id.idiag_if, tbl);
Pavel Emelyanov86e62ad2011-12-09 23:35:07 +000044#if IS_ENABLED(CONFIG_IPV6)
Pavel Emelyanova925aa02011-12-09 06:24:06 +000045 else if (req->sdiag_family == AF_INET6)
46 sk = __udp6_lib_lookup(&init_net,
47 (struct in6_addr *)req->id.idiag_src,
48 req->id.idiag_sport,
49 (struct in6_addr *)req->id.idiag_dst,
50 req->id.idiag_dport,
51 req->id.idiag_if, tbl);
Pavel Emelyanov86e62ad2011-12-09 23:35:07 +000052#endif
Pavel Emelyanova925aa02011-12-09 06:24:06 +000053 else
54 goto out_nosk;
55
56 err = -ENOENT;
57 if (sk == NULL)
58 goto out_nosk;
59
60 err = inet_diag_check_cookie(sk, req);
61 if (err)
62 goto out;
63
64 err = -ENOMEM;
65 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
66 sizeof(struct inet_diag_meminfo) +
67 64)), GFP_KERNEL);
68 if (!rep)
69 goto out;
70
71 err = inet_sk_diag_fill(sk, NULL, rep, req,
72 NETLINK_CB(in_skb).pid,
73 nlh->nlmsg_seq, 0, nlh);
74 if (err < 0) {
75 WARN_ON(err == -EMSGSIZE);
76 kfree_skb(rep);
77 goto out;
78 }
79 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
80 MSG_DONTWAIT);
81 if (err > 0)
82 err = 0;
83out:
84 if (sk)
85 sock_put(sk);
86out_nosk:
87 return err;
Pavel Emelyanov52b7c592011-12-09 06:23:51 +000088}
89
90static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb,
91 struct inet_diag_req *r, struct nlattr *bc)
92{
Pavel Emelyanovb6d640c2011-12-09 06:24:21 +000093 int num, s_num, slot, s_slot;
94
95 s_slot = cb->args[0];
96 num = s_num = cb->args[1];
97
98 for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) {
99 struct sock *sk;
100 struct hlist_nulls_node *node;
101 struct udp_hslot *hslot = &table->hash[slot];
102
103 if (hlist_nulls_empty(&hslot->head))
104 continue;
105
106 spin_lock_bh(&hslot->lock);
107 sk_nulls_for_each(sk, node, &hslot->head) {
108 struct inet_sock *inet = inet_sk(sk);
109
110 if (num < s_num)
111 goto next;
112 if (!(r->idiag_states & (1 << sk->sk_state)))
113 goto next;
114 if (r->sdiag_family != AF_UNSPEC &&
115 sk->sk_family != r->sdiag_family)
116 goto next;
117 if (r->id.idiag_sport != inet->inet_sport &&
118 r->id.idiag_sport)
119 goto next;
120 if (r->id.idiag_dport != inet->inet_dport &&
121 r->id.idiag_dport)
122 goto next;
123
124 if (sk_diag_dump(sk, skb, cb, r, bc) < 0) {
125 spin_unlock_bh(&hslot->lock);
126 goto done;
127 }
128next:
129 num++;
130 }
131 spin_unlock_bh(&hslot->lock);
132 }
133done:
134 cb->args[0] = slot;
135 cb->args[1] = num;
Pavel Emelyanov52b7c592011-12-09 06:23:51 +0000136}
137
138static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
139 struct inet_diag_req *r, struct nlattr *bc)
140{
141 udp_dump(&udp_table, skb, cb, r, bc);
142}
143
144static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
145 struct inet_diag_req *req)
146{
147 return udp_dump_one(&udp_table, in_skb, nlh, req);
148}
149
150static const struct inet_diag_handler udp_diag_handler = {
151 .dump = udp_diag_dump,
152 .dump_one = udp_diag_dump_one,
153 .idiag_type = IPPROTO_UDP,
154};
155
156static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
157 struct inet_diag_req *r, struct nlattr *bc)
158{
159 udp_dump(&udplite_table, skb, cb, r, bc);
160}
161
162static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
163 struct inet_diag_req *req)
164{
165 return udp_dump_one(&udplite_table, in_skb, nlh, req);
166}
167
168static const struct inet_diag_handler udplite_diag_handler = {
169 .dump = udplite_diag_dump,
170 .dump_one = udplite_diag_dump_one,
171 .idiag_type = IPPROTO_UDPLITE,
172};
173
174static int __init udp_diag_init(void)
175{
176 int err;
177
178 err = inet_diag_register(&udp_diag_handler);
179 if (err)
180 goto out;
181 err = inet_diag_register(&udplite_diag_handler);
182 if (err)
183 goto out_lite;
184out:
185 return err;
186out_lite:
187 inet_diag_unregister(&udp_diag_handler);
188 goto out;
189}
190
191static void __exit udp_diag_exit(void)
192{
193 inet_diag_unregister(&udplite_diag_handler);
194 inet_diag_unregister(&udp_diag_handler);
195}
196
197module_init(udp_diag_init);
198module_exit(udp_diag_exit);
199MODULE_LICENSE("GPL");
200MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17);
201MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 136);