Commit | Line | Data |
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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> | |
52b7c59b PE |
18 | #include <linux/sock_diag.h> |
19 | ||
b6d640c2 | 20 | static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, |
34160ea3 ED |
21 | struct netlink_callback *cb, |
22 | const struct inet_diag_req_v2 *req, | |
23 | struct nlattr *bc) | |
b6d640c2 PE |
24 | { |
25 | if (!inet_diag_bc_sk(bc, sk)) | |
26 | return 0; | |
27 | ||
d06ca956 | 28 | return inet_sk_diag_fill(sk, NULL, skb, req, |
e32123e5 | 29 | sk_user_ns(NETLINK_CB(cb->skb).sk), |
15e47304 | 30 | NETLINK_CB(cb->skb).portid, |
b6d640c2 PE |
31 | cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
32 | } | |
33 | ||
52b7c59b | 34 | static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb, |
34160ea3 ED |
35 | const struct nlmsghdr *nlh, |
36 | const struct inet_diag_req_v2 *req) | |
52b7c59b | 37 | { |
a925aa00 PE |
38 | int err = -EINVAL; |
39 | struct sock *sk; | |
40 | struct sk_buff *rep; | |
51d7cccf | 41 | struct net *net = sock_net(in_skb->sk); |
a925aa00 PE |
42 | |
43 | if (req->sdiag_family == AF_INET) | |
51d7cccf | 44 | sk = __udp4_lib_lookup(net, |
a925aa00 PE |
45 | 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); | |
86e62ad6 | 48 | #if IS_ENABLED(CONFIG_IPV6) |
a925aa00 | 49 | else if (req->sdiag_family == AF_INET6) |
51d7cccf | 50 | sk = __udp6_lib_lookup(net, |
a925aa00 PE |
51 | (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); | |
86e62ad6 | 56 | #endif |
a925aa00 PE |
57 | else |
58 | goto out_nosk; | |
59 | ||
60 | err = -ENOENT; | |
51456b29 | 61 | if (!sk) |
a925aa00 PE |
62 | goto out_nosk; |
63 | ||
f65c1b53 | 64 | err = sock_diag_check_cookie(sk, req->id.idiag_cookie); |
a925aa00 PE |
65 | if (err) |
66 | goto out; | |
67 | ||
68 | err = -ENOMEM; | |
573ce260 H |
69 | rep = nlmsg_new(sizeof(struct inet_diag_msg) + |
70 | sizeof(struct inet_diag_meminfo) + 64, | |
71 | GFP_KERNEL); | |
a925aa00 PE |
72 | if (!rep) |
73 | goto out; | |
74 | ||
75 | err = inet_sk_diag_fill(sk, NULL, rep, req, | |
e32123e5 | 76 | sk_user_ns(NETLINK_CB(in_skb).sk), |
15e47304 | 77 | NETLINK_CB(in_skb).portid, |
a925aa00 PE |
78 | nlh->nlmsg_seq, 0, nlh); |
79 | if (err < 0) { | |
80 | WARN_ON(err == -EMSGSIZE); | |
81 | kfree_skb(rep); | |
82 | goto out; | |
83 | } | |
15e47304 | 84 | err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, |
a925aa00 PE |
85 | MSG_DONTWAIT); |
86 | if (err > 0) | |
87 | err = 0; | |
88 | out: | |
89 | if (sk) | |
90 | sock_put(sk); | |
91 | out_nosk: | |
92 | return err; | |
52b7c59b PE |
93 | } |
94 | ||
34160ea3 ED |
95 | static 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) | |
52b7c59b | 98 | { |
b6d640c2 | 99 | int num, s_num, slot, s_slot; |
51d7cccf | 100 | struct net *net = sock_net(skb->sk); |
b6d640c2 PE |
101 | |
102 | s_slot = cb->args[0]; | |
103 | num = s_num = cb->args[1]; | |
104 | ||
86f3cddb | 105 | for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) { |
b6d640c2 PE |
106 | struct sock *sk; |
107 | struct hlist_nulls_node *node; | |
108 | struct udp_hslot *hslot = &table->hash[slot]; | |
109 | ||
86f3cddb HX |
110 | num = 0; |
111 | ||
b6d640c2 PE |
112 | 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 | ||
51d7cccf AV |
119 | if (!net_eq(sock_net(sk), net)) |
120 | continue; | |
b6d640c2 PE |
121 | 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 | } | |
139 | next: | |
140 | num++; | |
141 | } | |
142 | spin_unlock_bh(&hslot->lock); | |
143 | } | |
144 | done: | |
145 | cb->args[0] = slot; | |
146 | cb->args[1] = num; | |
52b7c59b PE |
147 | } |
148 | ||
149 | static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
34160ea3 | 150 | const struct inet_diag_req_v2 *r, struct nlattr *bc) |
52b7c59b PE |
151 | { |
152 | udp_dump(&udp_table, skb, cb, r, bc); | |
153 | } | |
154 | ||
155 | static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, | |
34160ea3 | 156 | const struct inet_diag_req_v2 *req) |
52b7c59b PE |
157 | { |
158 | return udp_dump_one(&udp_table, in_skb, nlh, req); | |
159 | } | |
160 | ||
62ad6fcd SW |
161 | static 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 | ||
52b7c59b PE |
168 | static const struct inet_diag_handler udp_diag_handler = { |
169 | .dump = udp_diag_dump, | |
170 | .dump_one = udp_diag_dump_one, | |
62ad6fcd | 171 | .idiag_get_info = udp_diag_get_info, |
52b7c59b | 172 | .idiag_type = IPPROTO_UDP, |
3fd22af8 | 173 | .idiag_info_size = 0, |
52b7c59b PE |
174 | }; |
175 | ||
176 | static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
34160ea3 ED |
177 | const struct inet_diag_req_v2 *r, |
178 | struct nlattr *bc) | |
52b7c59b PE |
179 | { |
180 | udp_dump(&udplite_table, skb, cb, r, bc); | |
181 | } | |
182 | ||
183 | static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, | |
34160ea3 | 184 | const struct inet_diag_req_v2 *req) |
52b7c59b PE |
185 | { |
186 | return udp_dump_one(&udplite_table, in_skb, nlh, req); | |
187 | } | |
188 | ||
189 | static const struct inet_diag_handler udplite_diag_handler = { | |
190 | .dump = udplite_diag_dump, | |
191 | .dump_one = udplite_diag_dump_one, | |
62ad6fcd | 192 | .idiag_get_info = udp_diag_get_info, |
52b7c59b | 193 | .idiag_type = IPPROTO_UDPLITE, |
3fd22af8 | 194 | .idiag_info_size = 0, |
52b7c59b PE |
195 | }; |
196 | ||
197 | static int __init udp_diag_init(void) | |
198 | { | |
199 | int err; | |
200 | ||
201 | err = inet_diag_register(&udp_diag_handler); | |
202 | if (err) | |
203 | goto out; | |
204 | err = inet_diag_register(&udplite_diag_handler); | |
205 | if (err) | |
206 | goto out_lite; | |
207 | out: | |
208 | return err; | |
209 | out_lite: | |
210 | inet_diag_unregister(&udp_diag_handler); | |
211 | goto out; | |
212 | } | |
213 | ||
214 | static void __exit udp_diag_exit(void) | |
215 | { | |
216 | inet_diag_unregister(&udplite_diag_handler); | |
217 | inet_diag_unregister(&udp_diag_handler); | |
218 | } | |
219 | ||
220 | module_init(udp_diag_init); | |
221 | module_exit(udp_diag_exit); | |
222 | MODULE_LICENSE("GPL"); | |
aec8dc62 PE |
223 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */); |
224 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */); |