tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/sock_diag.h>
19
20static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
21 struct netlink_callback *cb, struct inet_diag_req_v2 *req,
22 struct nlattr *bc)
23{
24 if (!inet_diag_bc_sk(bc, sk))
25 return 0;
26
27 return inet_sk_diag_fill(sk, NULL, skb, req,
28 sk_user_ns(NETLINK_CB(cb->skb).sk),
29 NETLINK_CB(cb->skb).portid,
30 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
31}
32
33static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
34 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
35{
36 int err = -EINVAL;
37 struct sock *sk;
38 struct sk_buff *rep;
39 struct net *net = sock_net(in_skb->sk);
40
41 if (req->sdiag_family == AF_INET)
42 sk = __udp4_lib_lookup(net,
43 req->id.idiag_src[0], req->id.idiag_sport,
44 req->id.idiag_dst[0], req->id.idiag_dport,
45 req->id.idiag_if, tbl);
46#if IS_ENABLED(CONFIG_IPV6)
47 else if (req->sdiag_family == AF_INET6)
48 sk = __udp6_lib_lookup(net,
49 (struct in6_addr *)req->id.idiag_src,
50 req->id.idiag_sport,
51 (struct in6_addr *)req->id.idiag_dst,
52 req->id.idiag_dport,
53 req->id.idiag_if, tbl);
54#endif
55 else
56 goto out_nosk;
57
58 err = -ENOENT;
59 if (sk == NULL)
60 goto out_nosk;
61
62 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
63 if (err)
64 goto out;
65
66 err = -ENOMEM;
67 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
68 sizeof(struct inet_diag_meminfo) + 64,
69 GFP_KERNEL);
70 if (!rep)
71 goto out;
72
73 err = inet_sk_diag_fill(sk, NULL, rep, req,
74 sk_user_ns(NETLINK_CB(in_skb).sk),
75 NETLINK_CB(in_skb).portid,
76 nlh->nlmsg_seq, 0, nlh);
77 if (err < 0) {
78 WARN_ON(err == -EMSGSIZE);
79 kfree_skb(rep);
80 goto out;
81 }
82 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
83 MSG_DONTWAIT);
84 if (err > 0)
85 err = 0;
86out:
87 if (sk)
88 sock_put(sk);
89out_nosk:
90 return err;
91}
92
93static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb,
94 struct inet_diag_req_v2 *r, struct nlattr *bc)
95{
96 int num, s_num, slot, s_slot;
97 struct net *net = sock_net(skb->sk);
98
99 s_slot = cb->args[0];
100 num = s_num = cb->args[1];
101
102 for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) {
103 struct sock *sk;
104 struct hlist_nulls_node *node;
105 struct udp_hslot *hslot = &table->hash[slot];
106
107 if (hlist_nulls_empty(&hslot->head))
108 continue;
109
110 spin_lock_bh(&hslot->lock);
111 sk_nulls_for_each(sk, node, &hslot->head) {
112 struct inet_sock *inet = inet_sk(sk);
113
114 if (!net_eq(sock_net(sk), net))
115 continue;
116 if (num < s_num)
117 goto next;
118 if (!(r->idiag_states & (1 << sk->sk_state)))
119 goto next;
120 if (r->sdiag_family != AF_UNSPEC &&
121 sk->sk_family != r->sdiag_family)
122 goto next;
123 if (r->id.idiag_sport != inet->inet_sport &&
124 r->id.idiag_sport)
125 goto next;
126 if (r->id.idiag_dport != inet->inet_dport &&
127 r->id.idiag_dport)
128 goto next;
129
130 if (sk_diag_dump(sk, skb, cb, r, bc) < 0) {
131 spin_unlock_bh(&hslot->lock);
132 goto done;
133 }
134next:
135 num++;
136 }
137 spin_unlock_bh(&hslot->lock);
138 }
139done:
140 cb->args[0] = slot;
141 cb->args[1] = num;
142}
143
144static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
145 struct inet_diag_req_v2 *r, struct nlattr *bc)
146{
147 udp_dump(&udp_table, skb, cb, r, bc);
148}
149
150static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
151 struct inet_diag_req_v2 *req)
152{
153 return udp_dump_one(&udp_table, in_skb, nlh, req);
154}
155
156static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
157 void *info)
158{
159 r->idiag_rqueue = sk_rmem_alloc_get(sk);
160 r->idiag_wqueue = sk_wmem_alloc_get(sk);
161}
162
163static const struct inet_diag_handler udp_diag_handler = {
164 .dump = udp_diag_dump,
165 .dump_one = udp_diag_dump_one,
166 .idiag_get_info = udp_diag_get_info,
167 .idiag_type = IPPROTO_UDP,
168};
169
170static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
171 struct inet_diag_req_v2 *r, struct nlattr *bc)
172{
173 udp_dump(&udplite_table, skb, cb, r, bc);
174}
175
176static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
177 struct inet_diag_req_v2 *req)
178{
179 return udp_dump_one(&udplite_table, in_skb, nlh, req);
180}
181
182static const struct inet_diag_handler udplite_diag_handler = {
183 .dump = udplite_diag_dump,
184 .dump_one = udplite_diag_dump_one,
185 .idiag_get_info = udp_diag_get_info,
186 .idiag_type = IPPROTO_UDPLITE,
187};
188
189static int __init udp_diag_init(void)
190{
191 int err;
192
193 err = inet_diag_register(&udp_diag_handler);
194 if (err)
195 goto out;
196 err = inet_diag_register(&udplite_diag_handler);
197 if (err)
198 goto out_lite;
199out:
200 return err;
201out_lite:
202 inet_diag_unregister(&udp_diag_handler);
203 goto out;
204}
205
206static void __exit udp_diag_exit(void)
207{
208 inet_diag_unregister(&udplite_diag_handler);
209 inet_diag_unregister(&udp_diag_handler);
210}
211
212module_init(udp_diag_init);
213module_exit(udp_diag_exit);
214MODULE_LICENSE("GPL");
215MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
216MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);