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>
9 #include <linux/inet_diag.h>
10 #include <linux/sock_diag.h>
12 static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
13 static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
14 static DEFINE_MUTEX(sock_diag_table_mutex);
16 int sock_diag_check_cookie(void *sk, __u32 *cookie)
18 if ((cookie[0] != INET_DIAG_NOCOOKIE ||
19 cookie[1] != INET_DIAG_NOCOOKIE) &&
20 ((u32)(unsigned long)sk != cookie[0] ||
21 (u32)((((unsigned long)sk) >> 31) >> 1) != cookie[1]))
26 EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
28 void sock_diag_save_cookie(void *sk, __u32 *cookie)
30 cookie[0] = (u32)(unsigned long)sk;
31 cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
33 EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
35 int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
37 u32 mem[SK_MEMINFO_VARS];
39 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
40 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
41 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
42 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
43 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
44 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
45 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
46 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
48 return nla_put(skb, attrtype, sizeof(mem), &mem);
50 EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
52 void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
54 mutex_lock(&sock_diag_table_mutex);
56 mutex_unlock(&sock_diag_table_mutex);
58 EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
60 void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
62 mutex_lock(&sock_diag_table_mutex);
63 inet_rcv_compat = NULL;
64 mutex_unlock(&sock_diag_table_mutex);
66 EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
68 int sock_diag_register(const struct sock_diag_handler *hndl)
72 if (hndl->family >= AF_MAX)
75 mutex_lock(&sock_diag_table_mutex);
76 if (sock_diag_handlers[hndl->family])
79 sock_diag_handlers[hndl->family] = hndl;
80 mutex_unlock(&sock_diag_table_mutex);
84 EXPORT_SYMBOL_GPL(sock_diag_register);
86 void sock_diag_unregister(const struct sock_diag_handler *hnld)
88 int family = hnld->family;
93 mutex_lock(&sock_diag_table_mutex);
94 BUG_ON(sock_diag_handlers[family] != hnld);
95 sock_diag_handlers[family] = NULL;
96 mutex_unlock(&sock_diag_table_mutex);
98 EXPORT_SYMBOL_GPL(sock_diag_unregister);
100 static const inline struct sock_diag_handler *sock_diag_lock_handler(int family)
102 if (sock_diag_handlers[family] == NULL)
103 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
104 NETLINK_SOCK_DIAG, family);
106 mutex_lock(&sock_diag_table_mutex);
107 return sock_diag_handlers[family];
110 static inline void sock_diag_unlock_handler(const struct sock_diag_handler *h)
112 mutex_unlock(&sock_diag_table_mutex);
115 static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
118 struct sock_diag_req *req = nlmsg_data(nlh);
119 const struct sock_diag_handler *hndl;
121 if (nlmsg_len(nlh) < sizeof(*req))
124 if (req->sdiag_family >= AF_MAX)
127 hndl = sock_diag_lock_handler(req->sdiag_family);
131 err = hndl->dump(skb, nlh);
132 sock_diag_unlock_handler(hndl);
137 static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
141 switch (nlh->nlmsg_type) {
142 case TCPDIAG_GETSOCK:
143 case DCCPDIAG_GETSOCK:
144 if (inet_rcv_compat == NULL)
145 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
146 NETLINK_SOCK_DIAG, AF_INET);
148 mutex_lock(&sock_diag_table_mutex);
149 if (inet_rcv_compat != NULL)
150 ret = inet_rcv_compat(skb, nlh);
153 mutex_unlock(&sock_diag_table_mutex);
156 case SOCK_DIAG_BY_FAMILY:
157 return __sock_diag_rcv_msg(skb, nlh);
163 static DEFINE_MUTEX(sock_diag_mutex);
165 static void sock_diag_rcv(struct sk_buff *skb)
167 mutex_lock(&sock_diag_mutex);
168 netlink_rcv_skb(skb, &sock_diag_rcv_msg);
169 mutex_unlock(&sock_diag_mutex);
172 static int __net_init diag_net_init(struct net *net)
174 struct netlink_kernel_cfg cfg = {
175 .input = sock_diag_rcv,
178 net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
179 return net->diag_nlsk == NULL ? -ENOMEM : 0;
182 static void __net_exit diag_net_exit(struct net *net)
184 netlink_kernel_release(net->diag_nlsk);
185 net->diag_nlsk = NULL;
188 static struct pernet_operations diag_net_ops = {
189 .init = diag_net_init,
190 .exit = diag_net_exit,
193 static int __init sock_diag_init(void)
195 return register_pernet_subsys(&diag_net_ops);
198 static void __exit sock_diag_exit(void)
200 unregister_pernet_subsys(&diag_net_ops);
203 module_init(sock_diag_init);
204 module_exit(sock_diag_exit);
205 MODULE_LICENSE("GPL");
206 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);