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1/* License: GPL */
2
3#include <linux/filter.h>
4#include <linux/mutex.h>
5#include <linux/socket.h>
6#include <linux/skbuff.h>
7#include <net/netlink.h>
8#include <net/net_namespace.h>
9#include <linux/module.h>
10#include <net/sock.h>
11#include <linux/kernel.h>
12#include <linux/tcp.h>
13#include <linux/workqueue.h>
14#include <linux/nospec.h>
15#include <linux/cookie.h>
16#include <linux/inet_diag.h>
17#include <linux/sock_diag.h>
18
19static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
20static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
21static DEFINE_MUTEX(sock_diag_table_mutex);
22static struct workqueue_struct *broadcast_wq;
23
24DEFINE_COOKIE(sock_cookie);
25
26u64 __sock_gen_cookie(struct sock *sk)
27{
28 u64 res = atomic64_read(&sk->sk_cookie);
29
30 if (!res) {
31 u64 new = gen_cookie_next(&sock_cookie);
32
33 atomic64_cmpxchg(&sk->sk_cookie, res, new);
34
35 /* Another thread might have changed sk_cookie before us. */
36 res = atomic64_read(&sk->sk_cookie);
37 }
38 return res;
39}
40
41int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie)
42{
43 u64 res;
44
45 if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
46 return 0;
47
48 res = sock_gen_cookie(sk);
49 if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1])
50 return -ESTALE;
51
52 return 0;
53}
54EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
55
56void sock_diag_save_cookie(struct sock *sk, __u32 *cookie)
57{
58 u64 res = sock_gen_cookie(sk);
59
60 cookie[0] = (u32)res;
61 cookie[1] = (u32)(res >> 32);
62}
63EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
64
65int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
66{
67 u32 mem[SK_MEMINFO_VARS];
68
69 sk_get_meminfo(sk, mem);
70
71 return nla_put(skb, attrtype, sizeof(mem), &mem);
72}
73EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
74
75int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
76 struct sk_buff *skb, int attrtype)
77{
78 struct sock_fprog_kern *fprog;
79 struct sk_filter *filter;
80 struct nlattr *attr;
81 unsigned int flen;
82 int err = 0;
83
84 if (!may_report_filterinfo) {
85 nla_reserve(skb, attrtype, 0);
86 return 0;
87 }
88
89 rcu_read_lock();
90 filter = rcu_dereference(sk->sk_filter);
91 if (!filter)
92 goto out;
93
94 fprog = filter->prog->orig_prog;
95 if (!fprog)
96 goto out;
97
98 flen = bpf_classic_proglen(fprog);
99
100 attr = nla_reserve(skb, attrtype, flen);
101 if (attr == NULL) {
102 err = -EMSGSIZE;
103 goto out;
104 }
105
106 memcpy(nla_data(attr), fprog->filter, flen);
107out:
108 rcu_read_unlock();
109 return err;
110}
111EXPORT_SYMBOL(sock_diag_put_filterinfo);
112
113struct broadcast_sk {
114 struct sock *sk;
115 struct work_struct work;
116};
117
118static size_t sock_diag_nlmsg_size(void)
119{
120 return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
121 + nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
122 + nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
123}
124
125static void sock_diag_broadcast_destroy_work(struct work_struct *work)
126{
127 struct broadcast_sk *bsk =
128 container_of(work, struct broadcast_sk, work);
129 struct sock *sk = bsk->sk;
130 const struct sock_diag_handler *hndl;
131 struct sk_buff *skb;
132 const enum sknetlink_groups group = sock_diag_destroy_group(sk);
133 int err = -1;
134
135 WARN_ON(group == SKNLGRP_NONE);
136
137 skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
138 if (!skb)
139 goto out;
140
141 mutex_lock(&sock_diag_table_mutex);
142 hndl = sock_diag_handlers[sk->sk_family];
143 if (hndl && hndl->get_info)
144 err = hndl->get_info(skb, sk);
145 mutex_unlock(&sock_diag_table_mutex);
146
147 if (!err)
148 nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
149 GFP_KERNEL);
150 else
151 kfree_skb(skb);
152out:
153 sk_destruct(sk);
154 kfree(bsk);
155}
156
157void sock_diag_broadcast_destroy(struct sock *sk)
158{
159 /* Note, this function is often called from an interrupt context. */
160 struct broadcast_sk *bsk =
161 kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
162 if (!bsk)
163 return sk_destruct(sk);
164 bsk->sk = sk;
165 INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
166 queue_work(broadcast_wq, &bsk->work);
167}
168
169void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
170{
171 mutex_lock(&sock_diag_table_mutex);
172 inet_rcv_compat = fn;
173 mutex_unlock(&sock_diag_table_mutex);
174}
175EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
176
177void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
178{
179 mutex_lock(&sock_diag_table_mutex);
180 inet_rcv_compat = NULL;
181 mutex_unlock(&sock_diag_table_mutex);
182}
183EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
184
185int sock_diag_register(const struct sock_diag_handler *hndl)
186{
187 int err = 0;
188
189 if (hndl->family >= AF_MAX)
190 return -EINVAL;
191
192 mutex_lock(&sock_diag_table_mutex);
193 if (sock_diag_handlers[hndl->family])
194 err = -EBUSY;
195 else
196 sock_diag_handlers[hndl->family] = hndl;
197 mutex_unlock(&sock_diag_table_mutex);
198
199 return err;
200}
201EXPORT_SYMBOL_GPL(sock_diag_register);
202
203void sock_diag_unregister(const struct sock_diag_handler *hnld)
204{
205 int family = hnld->family;
206
207 if (family >= AF_MAX)
208 return;
209
210 mutex_lock(&sock_diag_table_mutex);
211 BUG_ON(sock_diag_handlers[family] != hnld);
212 sock_diag_handlers[family] = NULL;
213 mutex_unlock(&sock_diag_table_mutex);
214}
215EXPORT_SYMBOL_GPL(sock_diag_unregister);
216
217static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh)
218{
219 int err;
220 struct sock_diag_req *req = nlmsg_data(nlh);
221 const struct sock_diag_handler *hndl;
222
223 if (nlmsg_len(nlh) < sizeof(*req))
224 return -EINVAL;
225
226 if (req->sdiag_family >= AF_MAX)
227 return -EINVAL;
228 req->sdiag_family = array_index_nospec(req->sdiag_family, AF_MAX);
229
230 if (sock_diag_handlers[req->sdiag_family] == NULL)
231 sock_load_diag_module(req->sdiag_family, 0);
232
233 mutex_lock(&sock_diag_table_mutex);
234 hndl = sock_diag_handlers[req->sdiag_family];
235 if (hndl == NULL)
236 err = -ENOENT;
237 else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
238 err = hndl->dump(skb, nlh);
239 else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
240 err = hndl->destroy(skb, nlh);
241 else
242 err = -EOPNOTSUPP;
243 mutex_unlock(&sock_diag_table_mutex);
244
245 return err;
246}
247
248static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
249 struct netlink_ext_ack *extack)
250{
251 int ret;
252
253 switch (nlh->nlmsg_type) {
254 case TCPDIAG_GETSOCK:
255 case DCCPDIAG_GETSOCK:
256 if (inet_rcv_compat == NULL)
257 sock_load_diag_module(AF_INET, 0);
258
259 mutex_lock(&sock_diag_table_mutex);
260 if (inet_rcv_compat != NULL)
261 ret = inet_rcv_compat(skb, nlh);
262 else
263 ret = -EOPNOTSUPP;
264 mutex_unlock(&sock_diag_table_mutex);
265
266 return ret;
267 case SOCK_DIAG_BY_FAMILY:
268 case SOCK_DESTROY:
269 return __sock_diag_cmd(skb, nlh);
270 default:
271 return -EINVAL;
272 }
273}
274
275static DEFINE_MUTEX(sock_diag_mutex);
276
277static void sock_diag_rcv(struct sk_buff *skb)
278{
279 mutex_lock(&sock_diag_mutex);
280 netlink_rcv_skb(skb, &sock_diag_rcv_msg);
281 mutex_unlock(&sock_diag_mutex);
282}
283
284static int sock_diag_bind(struct net *net, int group)
285{
286 switch (group) {
287 case SKNLGRP_INET_TCP_DESTROY:
288 case SKNLGRP_INET_UDP_DESTROY:
289 if (!sock_diag_handlers[AF_INET])
290 sock_load_diag_module(AF_INET, 0);
291 break;
292 case SKNLGRP_INET6_TCP_DESTROY:
293 case SKNLGRP_INET6_UDP_DESTROY:
294 if (!sock_diag_handlers[AF_INET6])
295 sock_load_diag_module(AF_INET6, 0);
296 break;
297 }
298 return 0;
299}
300
301int sock_diag_destroy(struct sock *sk, int err)
302{
303 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
304 return -EPERM;
305
306 if (!sk->sk_prot->diag_destroy)
307 return -EOPNOTSUPP;
308
309 return sk->sk_prot->diag_destroy(sk, err);
310}
311EXPORT_SYMBOL_GPL(sock_diag_destroy);
312
313static int __net_init diag_net_init(struct net *net)
314{
315 struct netlink_kernel_cfg cfg = {
316 .groups = SKNLGRP_MAX,
317 .input = sock_diag_rcv,
318 .bind = sock_diag_bind,
319 .flags = NL_CFG_F_NONROOT_RECV,
320 };
321
322 net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
323 return net->diag_nlsk == NULL ? -ENOMEM : 0;
324}
325
326static void __net_exit diag_net_exit(struct net *net)
327{
328 netlink_kernel_release(net->diag_nlsk);
329 net->diag_nlsk = NULL;
330}
331
332static struct pernet_operations diag_net_ops = {
333 .init = diag_net_init,
334 .exit = diag_net_exit,
335};
336
337static int __init sock_diag_init(void)
338{
339 broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
340 BUG_ON(!broadcast_wq);
341 return register_pernet_subsys(&diag_net_ops);
342}
343device_initcall(sock_diag_init);
1#include <linux/mutex.h>
2#include <linux/socket.h>
3#include <linux/skbuff.h>
4#include <net/netlink.h>
5#include <net/net_namespace.h>
6#include <linux/module.h>
7#include <linux/rtnetlink.h>
8#include <net/sock.h>
9
10#include <linux/inet_diag.h>
11#include <linux/sock_diag.h>
12
13static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
14static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
15static DEFINE_MUTEX(sock_diag_table_mutex);
16
17int sock_diag_check_cookie(void *sk, __u32 *cookie)
18{
19 if ((cookie[0] != INET_DIAG_NOCOOKIE ||
20 cookie[1] != INET_DIAG_NOCOOKIE) &&
21 ((u32)(unsigned long)sk != cookie[0] ||
22 (u32)((((unsigned long)sk) >> 31) >> 1) != cookie[1]))
23 return -ESTALE;
24 else
25 return 0;
26}
27EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
28
29void sock_diag_save_cookie(void *sk, __u32 *cookie)
30{
31 cookie[0] = (u32)(unsigned long)sk;
32 cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
33}
34EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
35
36int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
37{
38 __u32 *mem;
39
40 mem = RTA_DATA(__RTA_PUT(skb, attrtype, SK_MEMINFO_VARS * sizeof(__u32)));
41
42 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
43 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
44 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
45 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
46 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
47 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
48 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
49
50 return 0;
51
52rtattr_failure:
53 return -EMSGSIZE;
54}
55EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
56
57void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
58{
59 mutex_lock(&sock_diag_table_mutex);
60 inet_rcv_compat = fn;
61 mutex_unlock(&sock_diag_table_mutex);
62}
63EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
64
65void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
66{
67 mutex_lock(&sock_diag_table_mutex);
68 inet_rcv_compat = NULL;
69 mutex_unlock(&sock_diag_table_mutex);
70}
71EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
72
73int sock_diag_register(const struct sock_diag_handler *hndl)
74{
75 int err = 0;
76
77 if (hndl->family >= AF_MAX)
78 return -EINVAL;
79
80 mutex_lock(&sock_diag_table_mutex);
81 if (sock_diag_handlers[hndl->family])
82 err = -EBUSY;
83 else
84 sock_diag_handlers[hndl->family] = hndl;
85 mutex_unlock(&sock_diag_table_mutex);
86
87 return err;
88}
89EXPORT_SYMBOL_GPL(sock_diag_register);
90
91void sock_diag_unregister(const struct sock_diag_handler *hnld)
92{
93 int family = hnld->family;
94
95 if (family >= AF_MAX)
96 return;
97
98 mutex_lock(&sock_diag_table_mutex);
99 BUG_ON(sock_diag_handlers[family] != hnld);
100 sock_diag_handlers[family] = NULL;
101 mutex_unlock(&sock_diag_table_mutex);
102}
103EXPORT_SYMBOL_GPL(sock_diag_unregister);
104
105static const inline struct sock_diag_handler *sock_diag_lock_handler(int family)
106{
107 if (sock_diag_handlers[family] == NULL)
108 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
109 NETLINK_SOCK_DIAG, family);
110
111 mutex_lock(&sock_diag_table_mutex);
112 return sock_diag_handlers[family];
113}
114
115static inline void sock_diag_unlock_handler(const struct sock_diag_handler *h)
116{
117 mutex_unlock(&sock_diag_table_mutex);
118}
119
120static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
121{
122 int err;
123 struct sock_diag_req *req = NLMSG_DATA(nlh);
124 const struct sock_diag_handler *hndl;
125
126 if (nlmsg_len(nlh) < sizeof(*req))
127 return -EINVAL;
128
129 hndl = sock_diag_lock_handler(req->sdiag_family);
130 if (hndl == NULL)
131 err = -ENOENT;
132 else
133 err = hndl->dump(skb, nlh);
134 sock_diag_unlock_handler(hndl);
135
136 return err;
137}
138
139static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
140{
141 int ret;
142
143 switch (nlh->nlmsg_type) {
144 case TCPDIAG_GETSOCK:
145 case DCCPDIAG_GETSOCK:
146 if (inet_rcv_compat == NULL)
147 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
148 NETLINK_SOCK_DIAG, AF_INET);
149
150 mutex_lock(&sock_diag_table_mutex);
151 if (inet_rcv_compat != NULL)
152 ret = inet_rcv_compat(skb, nlh);
153 else
154 ret = -EOPNOTSUPP;
155 mutex_unlock(&sock_diag_table_mutex);
156
157 return ret;
158 case SOCK_DIAG_BY_FAMILY:
159 return __sock_diag_rcv_msg(skb, nlh);
160 default:
161 return -EINVAL;
162 }
163}
164
165static DEFINE_MUTEX(sock_diag_mutex);
166
167static void sock_diag_rcv(struct sk_buff *skb)
168{
169 mutex_lock(&sock_diag_mutex);
170 netlink_rcv_skb(skb, &sock_diag_rcv_msg);
171 mutex_unlock(&sock_diag_mutex);
172}
173
174struct sock *sock_diag_nlsk;
175EXPORT_SYMBOL_GPL(sock_diag_nlsk);
176
177static int __init sock_diag_init(void)
178{
179 sock_diag_nlsk = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
180 sock_diag_rcv, NULL, THIS_MODULE);
181 return sock_diag_nlsk == NULL ? -ENOMEM : 0;
182}
183
184static void __exit sock_diag_exit(void)
185{
186 netlink_kernel_release(sock_diag_nlsk);
187}
188
189module_init(sock_diag_init);
190module_exit(sock_diag_exit);
191MODULE_LICENSE("GPL");
192MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);