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52b7c59b PE |
1 | /* |
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 | ||
b6d640c2 PE |
21 | static 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 | ||
52b7c59b PE |
32 | static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb, |
33 | const struct nlmsghdr *nlh, struct inet_diag_req *req) | |
34 | { | |
a925aa00 PE |
35 | 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); | |
44 | else if (req->sdiag_family == AF_INET6) | |
45 | sk = __udp6_lib_lookup(&init_net, | |
46 | (struct in6_addr *)req->id.idiag_src, | |
47 | req->id.idiag_sport, | |
48 | (struct in6_addr *)req->id.idiag_dst, | |
49 | req->id.idiag_dport, | |
50 | req->id.idiag_if, tbl); | |
51 | else | |
52 | goto out_nosk; | |
53 | ||
54 | err = -ENOENT; | |
55 | if (sk == NULL) | |
56 | goto out_nosk; | |
57 | ||
58 | err = inet_diag_check_cookie(sk, req); | |
59 | if (err) | |
60 | goto out; | |
61 | ||
62 | err = -ENOMEM; | |
63 | rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + | |
64 | sizeof(struct inet_diag_meminfo) + | |
65 | 64)), GFP_KERNEL); | |
66 | if (!rep) | |
67 | goto out; | |
68 | ||
69 | err = inet_sk_diag_fill(sk, NULL, rep, req, | |
70 | NETLINK_CB(in_skb).pid, | |
71 | nlh->nlmsg_seq, 0, nlh); | |
72 | if (err < 0) { | |
73 | WARN_ON(err == -EMSGSIZE); | |
74 | kfree_skb(rep); | |
75 | goto out; | |
76 | } | |
77 | err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, | |
78 | MSG_DONTWAIT); | |
79 | if (err > 0) | |
80 | err = 0; | |
81 | out: | |
82 | if (sk) | |
83 | sock_put(sk); | |
84 | out_nosk: | |
85 | return err; | |
52b7c59b PE |
86 | } |
87 | ||
88 | static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb, | |
89 | struct inet_diag_req *r, struct nlattr *bc) | |
90 | { | |
b6d640c2 PE |
91 | int num, s_num, slot, s_slot; |
92 | ||
93 | s_slot = cb->args[0]; | |
94 | num = s_num = cb->args[1]; | |
95 | ||
96 | for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) { | |
97 | struct sock *sk; | |
98 | struct hlist_nulls_node *node; | |
99 | struct udp_hslot *hslot = &table->hash[slot]; | |
100 | ||
101 | if (hlist_nulls_empty(&hslot->head)) | |
102 | continue; | |
103 | ||
104 | spin_lock_bh(&hslot->lock); | |
105 | sk_nulls_for_each(sk, node, &hslot->head) { | |
106 | struct inet_sock *inet = inet_sk(sk); | |
107 | ||
108 | if (num < s_num) | |
109 | goto next; | |
110 | if (!(r->idiag_states & (1 << sk->sk_state))) | |
111 | goto next; | |
112 | if (r->sdiag_family != AF_UNSPEC && | |
113 | sk->sk_family != r->sdiag_family) | |
114 | goto next; | |
115 | if (r->id.idiag_sport != inet->inet_sport && | |
116 | r->id.idiag_sport) | |
117 | goto next; | |
118 | if (r->id.idiag_dport != inet->inet_dport && | |
119 | r->id.idiag_dport) | |
120 | goto next; | |
121 | ||
122 | if (sk_diag_dump(sk, skb, cb, r, bc) < 0) { | |
123 | spin_unlock_bh(&hslot->lock); | |
124 | goto done; | |
125 | } | |
126 | next: | |
127 | num++; | |
128 | } | |
129 | spin_unlock_bh(&hslot->lock); | |
130 | } | |
131 | done: | |
132 | cb->args[0] = slot; | |
133 | cb->args[1] = num; | |
52b7c59b PE |
134 | } |
135 | ||
136 | static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
137 | struct inet_diag_req *r, struct nlattr *bc) | |
138 | { | |
139 | udp_dump(&udp_table, skb, cb, r, bc); | |
140 | } | |
141 | ||
142 | static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, | |
143 | struct inet_diag_req *req) | |
144 | { | |
145 | return udp_dump_one(&udp_table, in_skb, nlh, req); | |
146 | } | |
147 | ||
148 | static const struct inet_diag_handler udp_diag_handler = { | |
149 | .dump = udp_diag_dump, | |
150 | .dump_one = udp_diag_dump_one, | |
151 | .idiag_type = IPPROTO_UDP, | |
152 | }; | |
153 | ||
154 | static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
155 | struct inet_diag_req *r, struct nlattr *bc) | |
156 | { | |
157 | udp_dump(&udplite_table, skb, cb, r, bc); | |
158 | } | |
159 | ||
160 | static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, | |
161 | struct inet_diag_req *req) | |
162 | { | |
163 | return udp_dump_one(&udplite_table, in_skb, nlh, req); | |
164 | } | |
165 | ||
166 | static const struct inet_diag_handler udplite_diag_handler = { | |
167 | .dump = udplite_diag_dump, | |
168 | .dump_one = udplite_diag_dump_one, | |
169 | .idiag_type = IPPROTO_UDPLITE, | |
170 | }; | |
171 | ||
172 | static int __init udp_diag_init(void) | |
173 | { | |
174 | int err; | |
175 | ||
176 | err = inet_diag_register(&udp_diag_handler); | |
177 | if (err) | |
178 | goto out; | |
179 | err = inet_diag_register(&udplite_diag_handler); | |
180 | if (err) | |
181 | goto out_lite; | |
182 | out: | |
183 | return err; | |
184 | out_lite: | |
185 | inet_diag_unregister(&udp_diag_handler); | |
186 | goto out; | |
187 | } | |
188 | ||
189 | static void __exit udp_diag_exit(void) | |
190 | { | |
191 | inet_diag_unregister(&udplite_diag_handler); | |
192 | inet_diag_unregister(&udp_diag_handler); | |
193 | } | |
194 | ||
195 | module_init(udp_diag_init); | |
196 | module_exit(udp_diag_exit); | |
197 | MODULE_LICENSE("GPL"); | |
198 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17); | |
199 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 136); |