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 | |
16 | static 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: 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 | |
28 | static 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(sk: 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 | saddr: req->id.idiag_src[0], sport: req->id.idiag_sport, |
43 | daddr: req->id.idiag_dst[0], dport: req->id.idiag_dport, |
44 | dif: req->id.idiag_if, sdif: 0, tbl, NULL); |
45 | #if IS_ENABLED(CONFIG_IPV6) |
46 | else if (req->sdiag_family == AF_INET6) |
47 | sk = __udp6_lib_lookup(net, |
48 | saddr: (struct in6_addr *)req->id.idiag_src, |
49 | sport: req->id.idiag_sport, |
50 | daddr: (struct in6_addr *)req->id.idiag_dst, |
51 | dport: req->id.idiag_dport, |
52 | dif: req->id.idiag_if, sdif: 0, tbl, NULL); |
53 | #endif |
54 | if (sk && !refcount_inc_not_zero(r: &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, cookie: req->id.idiag_cookie); |
62 | if (err) |
63 | goto out; |
64 | |
65 | err = -ENOMEM; |
66 | rep = nlmsg_new(payload: nla_total_size(payload: sizeof(struct inet_diag_msg)) + |
67 | inet_diag_msg_attrs_size() + |
68 | nla_total_size(payload: sizeof(struct inet_diag_meminfo)) + 64, |
69 | GFP_KERNEL); |
70 | if (!rep) |
71 | goto out; |
72 | |
73 | err = inet_sk_diag_fill(sk, NULL, skb: rep, cb, req, nlmsg_flags: 0, |
74 | net_admin: netlink_net_capable(skb: in_skb, CAP_NET_ADMIN)); |
75 | if (err < 0) { |
76 | WARN_ON(err == -EMSGSIZE); |
77 | kfree_skb(skb: rep); |
78 | goto out; |
79 | } |
80 | err = nlmsg_unicast(sk: net->diag_nlsk, skb: rep, NETLINK_CB(in_skb).portid); |
81 | |
82 | out: |
83 | if (sk) |
84 | sock_put(sk); |
85 | out_nosk: |
86 | return err; |
87 | } |
88 | |
89 | static 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(skb: cb->skb, CAP_NET_ADMIN); |
94 | struct net *net = sock_net(sk: 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(h: &hslot->head)) |
111 | continue; |
112 | |
113 | spin_lock_bh(lock: &hslot->lock); |
114 | sk_for_each(sk, &hslot->head) { |
115 | struct inet_sock *inet = inet_sk(sk); |
116 | |
117 | if (!net_eq(net1: sock_net(sk), net2: 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, req: r, bc, net_admin) < 0) { |
134 | spin_unlock_bh(lock: &hslot->lock); |
135 | goto done; |
136 | } |
137 | next: |
138 | num++; |
139 | } |
140 | spin_unlock_bh(lock: &hslot->lock); |
141 | } |
142 | done: |
143 | cb->args[0] = slot; |
144 | cb->args[1] = num; |
145 | } |
146 | |
147 | static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
148 | const struct inet_diag_req_v2 *r) |
149 | { |
150 | udp_dump(table: sock_net(sk: cb->skb->sk)->ipv4.udp_table, skb, cb, r); |
151 | } |
152 | |
153 | static int udp_diag_dump_one(struct netlink_callback *cb, |
154 | const struct inet_diag_req_v2 *req) |
155 | { |
156 | return udp_dump_one(tbl: sock_net(sk: cb->skb->sk)->ipv4.udp_table, cb, req); |
157 | } |
158 | |
159 | static 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 |
167 | static 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(sk: 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 | saddr: req->id.idiag_dst[0], sport: req->id.idiag_dport, |
180 | daddr: req->id.idiag_src[0], dport: req->id.idiag_sport, |
181 | dif: req->id.idiag_if, sdif: 0, tbl, NULL); |
182 | #if IS_ENABLED(CONFIG_IPV6) |
183 | else if (req->sdiag_family == AF_INET6) { |
184 | if (ipv6_addr_v4mapped(a: (struct in6_addr *)req->id.idiag_dst) && |
185 | ipv6_addr_v4mapped(a: (struct in6_addr *)req->id.idiag_src)) |
186 | sk = __udp4_lib_lookup(net, |
187 | saddr: req->id.idiag_dst[3], sport: req->id.idiag_dport, |
188 | daddr: req->id.idiag_src[3], dport: req->id.idiag_sport, |
189 | dif: req->id.idiag_if, sdif: 0, tbl, NULL); |
190 | |
191 | else |
192 | sk = __udp6_lib_lookup(net, |
193 | saddr: (struct in6_addr *)req->id.idiag_dst, |
194 | sport: req->id.idiag_dport, |
195 | daddr: (struct in6_addr *)req->id.idiag_src, |
196 | dport: req->id.idiag_sport, |
197 | dif: req->id.idiag_if, sdif: 0, tbl, NULL); |
198 | } |
199 | #endif |
200 | else { |
201 | rcu_read_unlock(); |
202 | return -EINVAL; |
203 | } |
204 | |
205 | if (sk && !refcount_inc_not_zero(r: &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, cookie: 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 | |
225 | static 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, tbl: sock_net(sk: in_skb->sk)->ipv4.udp_table); |
229 | } |
230 | |
231 | static 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, tbl: &udplite_table); |
235 | } |
236 | |
237 | #endif |
238 | |
239 | static const struct inet_diag_handler udp_diag_handler = { |
240 | .dump = udp_diag_dump, |
241 | .dump_one = udp_diag_dump_one, |
242 | .idiag_get_info = udp_diag_get_info, |
243 | .idiag_type = IPPROTO_UDP, |
244 | .idiag_info_size = 0, |
245 | #ifdef CONFIG_INET_DIAG_DESTROY |
246 | .destroy = udp_diag_destroy, |
247 | #endif |
248 | }; |
249 | |
250 | static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
251 | const struct inet_diag_req_v2 *r) |
252 | { |
253 | udp_dump(table: &udplite_table, skb, cb, r); |
254 | } |
255 | |
256 | static int udplite_diag_dump_one(struct netlink_callback *cb, |
257 | const struct inet_diag_req_v2 *req) |
258 | { |
259 | return udp_dump_one(tbl: &udplite_table, cb, req); |
260 | } |
261 | |
262 | static const struct inet_diag_handler udplite_diag_handler = { |
263 | .dump = udplite_diag_dump, |
264 | .dump_one = udplite_diag_dump_one, |
265 | .idiag_get_info = udp_diag_get_info, |
266 | .idiag_type = IPPROTO_UDPLITE, |
267 | .idiag_info_size = 0, |
268 | #ifdef CONFIG_INET_DIAG_DESTROY |
269 | .destroy = udplite_diag_destroy, |
270 | #endif |
271 | }; |
272 | |
273 | static int __init udp_diag_init(void) |
274 | { |
275 | int err; |
276 | |
277 | err = inet_diag_register(handler: &udp_diag_handler); |
278 | if (err) |
279 | goto out; |
280 | err = inet_diag_register(handler: &udplite_diag_handler); |
281 | if (err) |
282 | goto out_lite; |
283 | out: |
284 | return err; |
285 | out_lite: |
286 | inet_diag_unregister(handler: &udp_diag_handler); |
287 | goto out; |
288 | } |
289 | |
290 | static void __exit udp_diag_exit(void) |
291 | { |
292 | inet_diag_unregister(handler: &udplite_diag_handler); |
293 | inet_diag_unregister(handler: &udp_diag_handler); |
294 | } |
295 | |
296 | module_init(udp_diag_init); |
297 | module_exit(udp_diag_exit); |
298 | MODULE_LICENSE("GPL" ); |
299 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */); |
300 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */); |
301 | |