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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * udp_diag.c Module for monitoring UDP transport protocols sockets.
4 *
5 * Authors: Pavel Emelyanov, <xemul@parallels.com>
6 */
7
8
9#include <linux/module.h>
10#include <linux/inet_diag.h>
11#include <linux/udp.h>
12#include <net/udp.h>
13#include <net/udplite.h>
14#include <linux/sock_diag.h>
15
16static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
17 struct netlink_callback *cb,
18 const struct inet_diag_req_v2 *req,
19 struct nlattr *bc, bool net_admin)
20{
21 if (!inet_diag_bc_sk(bc, sk))
22 return 0;
23
24 return inet_sk_diag_fill(sk, NULL, skb, cb, req, NLM_F_MULTI,
25 net_admin);
26}
27
28static int udp_dump_one(struct udp_table *tbl,
29 struct netlink_callback *cb,
30 const struct inet_diag_req_v2 *req)
31{
32 struct sk_buff *in_skb = cb->skb;
33 int err;
34 struct sock *sk = NULL;
35 struct sk_buff *rep;
36 struct net *net = sock_net(in_skb->sk);
37
38 rcu_read_lock();
39 if (req->sdiag_family == AF_INET)
40 /* src and dst are swapped for historical reasons */
41 sk = __udp4_lib_lookup(net,
42 req->id.idiag_src[0], req->id.idiag_sport,
43 req->id.idiag_dst[0], req->id.idiag_dport,
44 req->id.idiag_if, 0, tbl, NULL);
45#if IS_ENABLED(CONFIG_IPV6)
46 else if (req->sdiag_family == AF_INET6)
47 sk = __udp6_lib_lookup(net,
48 (struct in6_addr *)req->id.idiag_src,
49 req->id.idiag_sport,
50 (struct in6_addr *)req->id.idiag_dst,
51 req->id.idiag_dport,
52 req->id.idiag_if, 0, tbl, NULL);
53#endif
54 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
55 sk = NULL;
56 rcu_read_unlock();
57 err = -ENOENT;
58 if (!sk)
59 goto out_nosk;
60
61 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
62 if (err)
63 goto out;
64
65 err = -ENOMEM;
66 rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
67 inet_diag_msg_attrs_size() +
68 nla_total_size(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, cb, req, 0,
74 netlink_net_capable(in_skb, CAP_NET_ADMIN));
75 if (err < 0) {
76 WARN_ON(err == -EMSGSIZE);
77 kfree_skb(rep);
78 goto out;
79 }
80 err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
81
82out:
83 if (sk)
84 sock_put(sk);
85out_nosk:
86 return err;
87}
88
89static void udp_dump(struct udp_table *table, struct sk_buff *skb,
90 struct netlink_callback *cb,
91 const struct inet_diag_req_v2 *r)
92{
93 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
94 struct net *net = sock_net(skb->sk);
95 struct inet_diag_dump_data *cb_data;
96 int num, s_num, slot, s_slot;
97 struct nlattr *bc;
98
99 cb_data = cb->data;
100 bc = cb_data->inet_diag_nla_bc;
101 s_slot = cb->args[0];
102 num = s_num = cb->args[1];
103
104 for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
105 struct udp_hslot *hslot = &table->hash[slot];
106 struct sock *sk;
107
108 num = 0;
109
110 if (hlist_empty(&hslot->head))
111 continue;
112
113 spin_lock_bh(&hslot->lock);
114 sk_for_each(sk, &hslot->head) {
115 struct inet_sock *inet = inet_sk(sk);
116
117 if (!net_eq(sock_net(sk), net))
118 continue;
119 if (num < s_num)
120 goto next;
121 if (!(r->idiag_states & (1 << sk->sk_state)))
122 goto next;
123 if (r->sdiag_family != AF_UNSPEC &&
124 sk->sk_family != r->sdiag_family)
125 goto next;
126 if (r->id.idiag_sport != inet->inet_sport &&
127 r->id.idiag_sport)
128 goto next;
129 if (r->id.idiag_dport != inet->inet_dport &&
130 r->id.idiag_dport)
131 goto next;
132
133 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
134 spin_unlock_bh(&hslot->lock);
135 goto done;
136 }
137next:
138 num++;
139 }
140 spin_unlock_bh(&hslot->lock);
141 }
142done:
143 cb->args[0] = slot;
144 cb->args[1] = num;
145}
146
147static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
148 const struct inet_diag_req_v2 *r)
149{
150 udp_dump(sock_net(cb->skb->sk)->ipv4.udp_table, skb, cb, r);
151}
152
153static int udp_diag_dump_one(struct netlink_callback *cb,
154 const struct inet_diag_req_v2 *req)
155{
156 return udp_dump_one(sock_net(cb->skb->sk)->ipv4.udp_table, cb, req);
157}
158
159static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
160 void *info)
161{
162 r->idiag_rqueue = udp_rqueue_get(sk);
163 r->idiag_wqueue = sk_wmem_alloc_get(sk);
164}
165
166#ifdef CONFIG_INET_DIAG_DESTROY
167static int __udp_diag_destroy(struct sk_buff *in_skb,
168 const struct inet_diag_req_v2 *req,
169 struct udp_table *tbl)
170{
171 struct net *net = sock_net(in_skb->sk);
172 struct sock *sk;
173 int err;
174
175 rcu_read_lock();
176
177 if (req->sdiag_family == AF_INET)
178 sk = __udp4_lib_lookup(net,
179 req->id.idiag_dst[0], req->id.idiag_dport,
180 req->id.idiag_src[0], req->id.idiag_sport,
181 req->id.idiag_if, 0, tbl, NULL);
182#if IS_ENABLED(CONFIG_IPV6)
183 else if (req->sdiag_family == AF_INET6) {
184 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
185 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
186 sk = __udp4_lib_lookup(net,
187 req->id.idiag_dst[3], req->id.idiag_dport,
188 req->id.idiag_src[3], req->id.idiag_sport,
189 req->id.idiag_if, 0, tbl, NULL);
190
191 else
192 sk = __udp6_lib_lookup(net,
193 (struct in6_addr *)req->id.idiag_dst,
194 req->id.idiag_dport,
195 (struct in6_addr *)req->id.idiag_src,
196 req->id.idiag_sport,
197 req->id.idiag_if, 0, tbl, NULL);
198 }
199#endif
200 else {
201 rcu_read_unlock();
202 return -EINVAL;
203 }
204
205 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
206 sk = NULL;
207
208 rcu_read_unlock();
209
210 if (!sk)
211 return -ENOENT;
212
213 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
214 sock_put(sk);
215 return -ENOENT;
216 }
217
218 err = sock_diag_destroy(sk, ECONNABORTED);
219
220 sock_put(sk);
221
222 return err;
223}
224
225static int udp_diag_destroy(struct sk_buff *in_skb,
226 const struct inet_diag_req_v2 *req)
227{
228 return __udp_diag_destroy(in_skb, req, sock_net(in_skb->sk)->ipv4.udp_table);
229}
230
231static int udplite_diag_destroy(struct sk_buff *in_skb,
232 const struct inet_diag_req_v2 *req)
233{
234 return __udp_diag_destroy(in_skb, req, &udplite_table);
235}
236
237#endif
238
239static const struct inet_diag_handler udp_diag_handler = {
240 .owner = THIS_MODULE,
241 .dump = udp_diag_dump,
242 .dump_one = udp_diag_dump_one,
243 .idiag_get_info = udp_diag_get_info,
244 .idiag_type = IPPROTO_UDP,
245 .idiag_info_size = 0,
246#ifdef CONFIG_INET_DIAG_DESTROY
247 .destroy = udp_diag_destroy,
248#endif
249};
250
251static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
252 const struct inet_diag_req_v2 *r)
253{
254 udp_dump(&udplite_table, skb, cb, r);
255}
256
257static int udplite_diag_dump_one(struct netlink_callback *cb,
258 const struct inet_diag_req_v2 *req)
259{
260 return udp_dump_one(&udplite_table, cb, req);
261}
262
263static const struct inet_diag_handler udplite_diag_handler = {
264 .owner = THIS_MODULE,
265 .dump = udplite_diag_dump,
266 .dump_one = udplite_diag_dump_one,
267 .idiag_get_info = udp_diag_get_info,
268 .idiag_type = IPPROTO_UDPLITE,
269 .idiag_info_size = 0,
270#ifdef CONFIG_INET_DIAG_DESTROY
271 .destroy = udplite_diag_destroy,
272#endif
273};
274
275static int __init udp_diag_init(void)
276{
277 int err;
278
279 err = inet_diag_register(&udp_diag_handler);
280 if (err)
281 goto out;
282 err = inet_diag_register(&udplite_diag_handler);
283 if (err)
284 goto out_lite;
285out:
286 return err;
287out_lite:
288 inet_diag_unregister(&udp_diag_handler);
289 goto out;
290}
291
292static void __exit udp_diag_exit(void)
293{
294 inet_diag_unregister(&udplite_diag_handler);
295 inet_diag_unregister(&udp_diag_handler);
296}
297
298module_init(udp_diag_init);
299module_exit(udp_diag_exit);
300MODULE_LICENSE("GPL");
301MODULE_DESCRIPTION("UDP socket monitoring via SOCK_DIAG");
302MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
303MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * udp_diag.c Module for monitoring UDP transport protocols sockets.
4 *
5 * Authors: Pavel Emelyanov, <xemul@parallels.com>
6 */
7
8
9#include <linux/module.h>
10#include <linux/inet_diag.h>
11#include <linux/udp.h>
12#include <net/udp.h>
13#include <net/udplite.h>
14#include <linux/sock_diag.h>
15
16static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
17 struct netlink_callback *cb,
18 const struct inet_diag_req_v2 *req,
19 struct nlattr *bc, bool net_admin)
20{
21 if (!inet_diag_bc_sk(bc, sk))
22 return 0;
23
24 return inet_sk_diag_fill(sk, NULL, skb, cb, req, NLM_F_MULTI,
25 net_admin);
26}
27
28static int udp_dump_one(struct udp_table *tbl,
29 struct netlink_callback *cb,
30 const struct inet_diag_req_v2 *req)
31{
32 struct sk_buff *in_skb = cb->skb;
33 int err = -EINVAL;
34 struct sock *sk = NULL;
35 struct sk_buff *rep;
36 struct net *net = sock_net(in_skb->sk);
37
38 rcu_read_lock();
39 if (req->sdiag_family == AF_INET)
40 /* src and dst are swapped for historical reasons */
41 sk = __udp4_lib_lookup(net,
42 req->id.idiag_src[0], req->id.idiag_sport,
43 req->id.idiag_dst[0], req->id.idiag_dport,
44 req->id.idiag_if, 0, tbl, NULL);
45#if IS_ENABLED(CONFIG_IPV6)
46 else if (req->sdiag_family == AF_INET6)
47 sk = __udp6_lib_lookup(net,
48 (struct in6_addr *)req->id.idiag_src,
49 req->id.idiag_sport,
50 (struct in6_addr *)req->id.idiag_dst,
51 req->id.idiag_dport,
52 req->id.idiag_if, 0, tbl, NULL);
53#endif
54 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
55 sk = NULL;
56 rcu_read_unlock();
57 err = -ENOENT;
58 if (!sk)
59 goto out_nosk;
60
61 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
62 if (err)
63 goto out;
64
65 err = -ENOMEM;
66 rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
67 inet_diag_msg_attrs_size() +
68 nla_total_size(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, cb, req, 0,
74 netlink_net_capable(in_skb, CAP_NET_ADMIN));
75 if (err < 0) {
76 WARN_ON(err == -EMSGSIZE);
77 kfree_skb(rep);
78 goto out;
79 }
80 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
81 MSG_DONTWAIT);
82 if (err > 0)
83 err = 0;
84out:
85 if (sk)
86 sock_put(sk);
87out_nosk:
88 return err;
89}
90
91static void udp_dump(struct udp_table *table, struct sk_buff *skb,
92 struct netlink_callback *cb,
93 const struct inet_diag_req_v2 *r)
94{
95 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
96 struct net *net = sock_net(skb->sk);
97 struct inet_diag_dump_data *cb_data;
98 int num, s_num, slot, s_slot;
99 struct nlattr *bc;
100
101 cb_data = cb->data;
102 bc = cb_data->inet_diag_nla_bc;
103 s_slot = cb->args[0];
104 num = s_num = cb->args[1];
105
106 for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
107 struct udp_hslot *hslot = &table->hash[slot];
108 struct sock *sk;
109
110 num = 0;
111
112 if (hlist_empty(&hslot->head))
113 continue;
114
115 spin_lock_bh(&hslot->lock);
116 sk_for_each(sk, &hslot->head) {
117 struct inet_sock *inet = inet_sk(sk);
118
119 if (!net_eq(sock_net(sk), net))
120 continue;
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, net_admin) < 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;
147}
148
149static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
150 const struct inet_diag_req_v2 *r)
151{
152 udp_dump(&udp_table, skb, cb, r);
153}
154
155static int udp_diag_dump_one(struct netlink_callback *cb,
156 const struct inet_diag_req_v2 *req)
157{
158 return udp_dump_one(&udp_table, cb, req);
159}
160
161static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
162 void *info)
163{
164 r->idiag_rqueue = udp_rqueue_get(sk);
165 r->idiag_wqueue = sk_wmem_alloc_get(sk);
166}
167
168#ifdef CONFIG_INET_DIAG_DESTROY
169static int __udp_diag_destroy(struct sk_buff *in_skb,
170 const struct inet_diag_req_v2 *req,
171 struct udp_table *tbl)
172{
173 struct net *net = sock_net(in_skb->sk);
174 struct sock *sk;
175 int err;
176
177 rcu_read_lock();
178
179 if (req->sdiag_family == AF_INET)
180 sk = __udp4_lib_lookup(net,
181 req->id.idiag_dst[0], req->id.idiag_dport,
182 req->id.idiag_src[0], req->id.idiag_sport,
183 req->id.idiag_if, 0, tbl, NULL);
184#if IS_ENABLED(CONFIG_IPV6)
185 else if (req->sdiag_family == AF_INET6) {
186 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
187 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
188 sk = __udp4_lib_lookup(net,
189 req->id.idiag_dst[3], req->id.idiag_dport,
190 req->id.idiag_src[3], req->id.idiag_sport,
191 req->id.idiag_if, 0, tbl, NULL);
192
193 else
194 sk = __udp6_lib_lookup(net,
195 (struct in6_addr *)req->id.idiag_dst,
196 req->id.idiag_dport,
197 (struct in6_addr *)req->id.idiag_src,
198 req->id.idiag_sport,
199 req->id.idiag_if, 0, tbl, NULL);
200 }
201#endif
202 else {
203 rcu_read_unlock();
204 return -EINVAL;
205 }
206
207 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
208 sk = NULL;
209
210 rcu_read_unlock();
211
212 if (!sk)
213 return -ENOENT;
214
215 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
216 sock_put(sk);
217 return -ENOENT;
218 }
219
220 err = sock_diag_destroy(sk, ECONNABORTED);
221
222 sock_put(sk);
223
224 return err;
225}
226
227static int udp_diag_destroy(struct sk_buff *in_skb,
228 const struct inet_diag_req_v2 *req)
229{
230 return __udp_diag_destroy(in_skb, req, &udp_table);
231}
232
233static int udplite_diag_destroy(struct sk_buff *in_skb,
234 const struct inet_diag_req_v2 *req)
235{
236 return __udp_diag_destroy(in_skb, req, &udplite_table);
237}
238
239#endif
240
241static const struct inet_diag_handler udp_diag_handler = {
242 .dump = udp_diag_dump,
243 .dump_one = udp_diag_dump_one,
244 .idiag_get_info = udp_diag_get_info,
245 .idiag_type = IPPROTO_UDP,
246 .idiag_info_size = 0,
247#ifdef CONFIG_INET_DIAG_DESTROY
248 .destroy = udp_diag_destroy,
249#endif
250};
251
252static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
253 const struct inet_diag_req_v2 *r)
254{
255 udp_dump(&udplite_table, skb, cb, r);
256}
257
258static int udplite_diag_dump_one(struct netlink_callback *cb,
259 const struct inet_diag_req_v2 *req)
260{
261 return udp_dump_one(&udplite_table, cb, req);
262}
263
264static const struct inet_diag_handler udplite_diag_handler = {
265 .dump = udplite_diag_dump,
266 .dump_one = udplite_diag_dump_one,
267 .idiag_get_info = udp_diag_get_info,
268 .idiag_type = IPPROTO_UDPLITE,
269 .idiag_info_size = 0,
270#ifdef CONFIG_INET_DIAG_DESTROY
271 .destroy = udplite_diag_destroy,
272#endif
273};
274
275static int __init udp_diag_init(void)
276{
277 int err;
278
279 err = inet_diag_register(&udp_diag_handler);
280 if (err)
281 goto out;
282 err = inet_diag_register(&udplite_diag_handler);
283 if (err)
284 goto out_lite;
285out:
286 return err;
287out_lite:
288 inet_diag_unregister(&udp_diag_handler);
289 goto out;
290}
291
292static void __exit udp_diag_exit(void)
293{
294 inet_diag_unregister(&udplite_diag_handler);
295 inet_diag_unregister(&udp_diag_handler);
296}
297
298module_init(udp_diag_init);
299module_exit(udp_diag_exit);
300MODULE_LICENSE("GPL");
301MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
302MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);