Commit | Line | Data |
---|---|---|
8ef874bf PE |
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> | |
5d2e5f27 | 7 | #include <net/sock.h> |
8ef874bf PE |
8 | |
9 | #include <linux/inet_diag.h> | |
10 | #include <linux/sock_diag.h> | |
11 | ||
8dcf01fc | 12 | static const struct sock_diag_handler *sock_diag_handlers[AF_MAX]; |
8ef874bf PE |
13 | static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); |
14 | static DEFINE_MUTEX(sock_diag_table_mutex); | |
15 | ||
f65c1b53 PE |
16 | int sock_diag_check_cookie(void *sk, __u32 *cookie) |
17 | { | |
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])) | |
22 | return -ESTALE; | |
23 | else | |
24 | return 0; | |
25 | } | |
26 | EXPORT_SYMBOL_GPL(sock_diag_check_cookie); | |
27 | ||
28 | void sock_diag_save_cookie(void *sk, __u32 *cookie) | |
29 | { | |
30 | cookie[0] = (u32)(unsigned long)sk; | |
31 | cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); | |
32 | } | |
33 | EXPORT_SYMBOL_GPL(sock_diag_save_cookie); | |
34 | ||
5d2e5f27 PE |
35 | int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) |
36 | { | |
7b46866d | 37 | u32 mem[SK_MEMINFO_VARS]; |
5d2e5f27 PE |
38 | |
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); | |
d594e987 | 46 | mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; |
5d2e5f27 | 47 | |
7b46866d | 48 | return nla_put(skb, attrtype, sizeof(mem), &mem); |
5d2e5f27 PE |
49 | } |
50 | EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); | |
51 | ||
e8d9612c ND |
52 | int sock_diag_put_filterinfo(struct user_namespace *user_ns, struct sock *sk, |
53 | struct sk_buff *skb, int attrtype) | |
54 | { | |
55 | struct nlattr *attr; | |
56 | struct sk_filter *filter; | |
57 | unsigned int len; | |
58 | int err = 0; | |
59 | ||
60 | if (!ns_capable(user_ns, CAP_NET_ADMIN)) { | |
61 | nla_reserve(skb, attrtype, 0); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | rcu_read_lock(); | |
66 | ||
67 | filter = rcu_dereference(sk->sk_filter); | |
68 | len = filter ? filter->len * sizeof(struct sock_filter) : 0; | |
69 | ||
70 | attr = nla_reserve(skb, attrtype, len); | |
71 | if (attr == NULL) { | |
72 | err = -EMSGSIZE; | |
73 | goto out; | |
74 | } | |
75 | ||
ed13998c ND |
76 | if (filter) { |
77 | struct sock_filter *fb = (struct sock_filter *)nla_data(attr); | |
78 | int i; | |
79 | ||
80 | for (i = 0; i < filter->len; i++, fb++) | |
81 | sk_decode_filter(&filter->insns[i], fb); | |
82 | } | |
e8d9612c ND |
83 | |
84 | out: | |
85 | rcu_read_unlock(); | |
86 | return err; | |
87 | } | |
88 | EXPORT_SYMBOL(sock_diag_put_filterinfo); | |
89 | ||
8ef874bf PE |
90 | void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) |
91 | { | |
92 | mutex_lock(&sock_diag_table_mutex); | |
93 | inet_rcv_compat = fn; | |
94 | mutex_unlock(&sock_diag_table_mutex); | |
95 | } | |
96 | EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); | |
97 | ||
98 | void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) | |
99 | { | |
100 | mutex_lock(&sock_diag_table_mutex); | |
101 | inet_rcv_compat = NULL; | |
102 | mutex_unlock(&sock_diag_table_mutex); | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); | |
105 | ||
8dcf01fc | 106 | int sock_diag_register(const struct sock_diag_handler *hndl) |
8ef874bf PE |
107 | { |
108 | int err = 0; | |
109 | ||
6f8e4ad0 | 110 | if (hndl->family >= AF_MAX) |
8ef874bf PE |
111 | return -EINVAL; |
112 | ||
113 | mutex_lock(&sock_diag_table_mutex); | |
114 | if (sock_diag_handlers[hndl->family]) | |
115 | err = -EBUSY; | |
116 | else | |
117 | sock_diag_handlers[hndl->family] = hndl; | |
118 | mutex_unlock(&sock_diag_table_mutex); | |
119 | ||
120 | return err; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(sock_diag_register); | |
123 | ||
8dcf01fc | 124 | void sock_diag_unregister(const struct sock_diag_handler *hnld) |
8ef874bf PE |
125 | { |
126 | int family = hnld->family; | |
127 | ||
6f8e4ad0 | 128 | if (family >= AF_MAX) |
8ef874bf PE |
129 | return; |
130 | ||
131 | mutex_lock(&sock_diag_table_mutex); | |
132 | BUG_ON(sock_diag_handlers[family] != hnld); | |
133 | sock_diag_handlers[family] = NULL; | |
134 | mutex_unlock(&sock_diag_table_mutex); | |
135 | } | |
136 | EXPORT_SYMBOL_GPL(sock_diag_unregister); | |
137 | ||
8ef874bf PE |
138 | static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
139 | { | |
140 | int err; | |
7b46866d | 141 | struct sock_diag_req *req = nlmsg_data(nlh); |
8dcf01fc | 142 | const struct sock_diag_handler *hndl; |
8ef874bf PE |
143 | |
144 | if (nlmsg_len(nlh) < sizeof(*req)) | |
145 | return -EINVAL; | |
146 | ||
6e601a53 MK |
147 | if (req->sdiag_family >= AF_MAX) |
148 | return -EINVAL; | |
149 | ||
8e904550 MK |
150 | if (sock_diag_handlers[req->sdiag_family] == NULL) |
151 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
152 | NETLINK_SOCK_DIAG, req->sdiag_family); | |
153 | ||
154 | mutex_lock(&sock_diag_table_mutex); | |
155 | hndl = sock_diag_handlers[req->sdiag_family]; | |
8ef874bf PE |
156 | if (hndl == NULL) |
157 | err = -ENOENT; | |
158 | else | |
159 | err = hndl->dump(skb, nlh); | |
8e904550 | 160 | mutex_unlock(&sock_diag_table_mutex); |
8ef874bf PE |
161 | |
162 | return err; | |
163 | } | |
164 | ||
165 | static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
166 | { | |
167 | int ret; | |
168 | ||
169 | switch (nlh->nlmsg_type) { | |
170 | case TCPDIAG_GETSOCK: | |
171 | case DCCPDIAG_GETSOCK: | |
172 | if (inet_rcv_compat == NULL) | |
173 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
aec8dc62 | 174 | NETLINK_SOCK_DIAG, AF_INET); |
8ef874bf PE |
175 | |
176 | mutex_lock(&sock_diag_table_mutex); | |
177 | if (inet_rcv_compat != NULL) | |
178 | ret = inet_rcv_compat(skb, nlh); | |
179 | else | |
180 | ret = -EOPNOTSUPP; | |
181 | mutex_unlock(&sock_diag_table_mutex); | |
182 | ||
183 | return ret; | |
184 | case SOCK_DIAG_BY_FAMILY: | |
185 | return __sock_diag_rcv_msg(skb, nlh); | |
186 | default: | |
187 | return -EINVAL; | |
188 | } | |
189 | } | |
190 | ||
191 | static DEFINE_MUTEX(sock_diag_mutex); | |
192 | ||
193 | static void sock_diag_rcv(struct sk_buff *skb) | |
194 | { | |
195 | mutex_lock(&sock_diag_mutex); | |
196 | netlink_rcv_skb(skb, &sock_diag_rcv_msg); | |
197 | mutex_unlock(&sock_diag_mutex); | |
198 | } | |
199 | ||
51d7cccf | 200 | static int __net_init diag_net_init(struct net *net) |
8ef874bf | 201 | { |
a31f2d17 PNA |
202 | struct netlink_kernel_cfg cfg = { |
203 | .input = sock_diag_rcv, | |
204 | }; | |
205 | ||
9f00d977 | 206 | net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); |
51d7cccf AV |
207 | return net->diag_nlsk == NULL ? -ENOMEM : 0; |
208 | } | |
209 | ||
210 | static void __net_exit diag_net_exit(struct net *net) | |
211 | { | |
212 | netlink_kernel_release(net->diag_nlsk); | |
213 | net->diag_nlsk = NULL; | |
214 | } | |
215 | ||
216 | static struct pernet_operations diag_net_ops = { | |
217 | .init = diag_net_init, | |
218 | .exit = diag_net_exit, | |
219 | }; | |
220 | ||
221 | static int __init sock_diag_init(void) | |
222 | { | |
223 | return register_pernet_subsys(&diag_net_ops); | |
8ef874bf PE |
224 | } |
225 | ||
226 | static void __exit sock_diag_exit(void) | |
227 | { | |
51d7cccf | 228 | unregister_pernet_subsys(&diag_net_ops); |
8ef874bf PE |
229 | } |
230 | ||
231 | module_init(sock_diag_init); | |
232 | module_exit(sock_diag_exit); | |
233 | MODULE_LICENSE("GPL"); | |
234 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); |