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> |
eb4cb008 CG |
8 | #include <linux/kernel.h> |
9 | #include <linux/tcp.h> | |
10 | #include <linux/workqueue.h> | |
8ef874bf PE |
11 | |
12 | #include <linux/inet_diag.h> | |
13 | #include <linux/sock_diag.h> | |
14 | ||
8dcf01fc | 15 | static const struct sock_diag_handler *sock_diag_handlers[AF_MAX]; |
8ef874bf PE |
16 | static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); |
17 | static DEFINE_MUTEX(sock_diag_table_mutex); | |
eb4cb008 | 18 | static struct workqueue_struct *broadcast_wq; |
8ef874bf | 19 | |
33cf7c90 | 20 | static u64 sock_gen_cookie(struct sock *sk) |
f65c1b53 | 21 | { |
33cf7c90 ED |
22 | while (1) { |
23 | u64 res = atomic64_read(&sk->sk_cookie); | |
24 | ||
25 | if (res) | |
26 | return res; | |
27 | res = atomic64_inc_return(&sock_net(sk)->cookie_gen); | |
28 | atomic64_cmpxchg(&sk->sk_cookie, 0, res); | |
29 | } | |
30 | } | |
31 | ||
32 | int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie) | |
33 | { | |
34 | u64 res; | |
35 | ||
36 | if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE) | |
f65c1b53 | 37 | return 0; |
33cf7c90 ED |
38 | |
39 | res = sock_gen_cookie(sk); | |
40 | if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1]) | |
41 | return -ESTALE; | |
42 | ||
43 | return 0; | |
f65c1b53 PE |
44 | } |
45 | EXPORT_SYMBOL_GPL(sock_diag_check_cookie); | |
46 | ||
33cf7c90 | 47 | void sock_diag_save_cookie(struct sock *sk, __u32 *cookie) |
f65c1b53 | 48 | { |
33cf7c90 ED |
49 | u64 res = sock_gen_cookie(sk); |
50 | ||
51 | cookie[0] = (u32)res; | |
52 | cookie[1] = (u32)(res >> 32); | |
f65c1b53 PE |
53 | } |
54 | EXPORT_SYMBOL_GPL(sock_diag_save_cookie); | |
55 | ||
5d2e5f27 PE |
56 | int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) |
57 | { | |
7b46866d | 58 | u32 mem[SK_MEMINFO_VARS]; |
5d2e5f27 PE |
59 | |
60 | mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); | |
61 | mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; | |
62 | mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); | |
63 | mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; | |
64 | mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; | |
65 | mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; | |
66 | mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); | |
d594e987 | 67 | mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; |
5d2e5f27 | 68 | |
7b46866d | 69 | return nla_put(skb, attrtype, sizeof(mem), &mem); |
5d2e5f27 PE |
70 | } |
71 | EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); | |
72 | ||
a53b72c8 | 73 | int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk, |
e8d9612c ND |
74 | struct sk_buff *skb, int attrtype) |
75 | { | |
a3ea269b | 76 | struct sock_fprog_kern *fprog; |
e8d9612c | 77 | struct sk_filter *filter; |
a3ea269b DB |
78 | struct nlattr *attr; |
79 | unsigned int flen; | |
e8d9612c ND |
80 | int err = 0; |
81 | ||
a53b72c8 | 82 | if (!may_report_filterinfo) { |
e8d9612c ND |
83 | nla_reserve(skb, attrtype, 0); |
84 | return 0; | |
85 | } | |
86 | ||
87 | rcu_read_lock(); | |
e8d9612c | 88 | filter = rcu_dereference(sk->sk_filter); |
a3ea269b DB |
89 | if (!filter) |
90 | goto out; | |
e8d9612c | 91 | |
7ae457c1 | 92 | fprog = filter->prog->orig_prog; |
b382c086 DB |
93 | if (!fprog) |
94 | goto out; | |
95 | ||
009937e7 | 96 | flen = bpf_classic_proglen(fprog); |
a3ea269b DB |
97 | |
98 | attr = nla_reserve(skb, attrtype, flen); | |
e8d9612c ND |
99 | if (attr == NULL) { |
100 | err = -EMSGSIZE; | |
101 | goto out; | |
102 | } | |
103 | ||
a3ea269b | 104 | memcpy(nla_data(attr), fprog->filter, flen); |
e8d9612c ND |
105 | out: |
106 | rcu_read_unlock(); | |
107 | return err; | |
108 | } | |
109 | EXPORT_SYMBOL(sock_diag_put_filterinfo); | |
110 | ||
eb4cb008 CG |
111 | struct broadcast_sk { |
112 | struct sock *sk; | |
113 | struct work_struct work; | |
114 | }; | |
115 | ||
116 | static size_t sock_diag_nlmsg_size(void) | |
117 | { | |
118 | return NLMSG_ALIGN(sizeof(struct inet_diag_msg) | |
119 | + nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */ | |
120 | + nla_total_size(sizeof(struct tcp_info))); /* INET_DIAG_INFO */ | |
121 | } | |
122 | ||
123 | static void sock_diag_broadcast_destroy_work(struct work_struct *work) | |
124 | { | |
125 | struct broadcast_sk *bsk = | |
126 | container_of(work, struct broadcast_sk, work); | |
127 | struct sock *sk = bsk->sk; | |
128 | const struct sock_diag_handler *hndl; | |
129 | struct sk_buff *skb; | |
130 | const enum sknetlink_groups group = sock_diag_destroy_group(sk); | |
131 | int err = -1; | |
132 | ||
133 | WARN_ON(group == SKNLGRP_NONE); | |
134 | ||
135 | skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL); | |
136 | if (!skb) | |
137 | goto out; | |
138 | ||
139 | mutex_lock(&sock_diag_table_mutex); | |
140 | hndl = sock_diag_handlers[sk->sk_family]; | |
141 | if (hndl && hndl->get_info) | |
142 | err = hndl->get_info(skb, sk); | |
143 | mutex_unlock(&sock_diag_table_mutex); | |
144 | ||
145 | if (!err) | |
146 | nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group, | |
147 | GFP_KERNEL); | |
148 | else | |
149 | kfree_skb(skb); | |
150 | out: | |
151 | sk_destruct(sk); | |
152 | kfree(bsk); | |
153 | } | |
154 | ||
155 | void sock_diag_broadcast_destroy(struct sock *sk) | |
156 | { | |
157 | /* Note, this function is often called from an interrupt context. */ | |
158 | struct broadcast_sk *bsk = | |
159 | kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC); | |
160 | if (!bsk) | |
161 | return sk_destruct(sk); | |
162 | bsk->sk = sk; | |
163 | INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work); | |
164 | queue_work(broadcast_wq, &bsk->work); | |
165 | } | |
166 | ||
8ef874bf PE |
167 | void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) |
168 | { | |
169 | mutex_lock(&sock_diag_table_mutex); | |
170 | inet_rcv_compat = fn; | |
171 | mutex_unlock(&sock_diag_table_mutex); | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); | |
174 | ||
175 | void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) | |
176 | { | |
177 | mutex_lock(&sock_diag_table_mutex); | |
178 | inet_rcv_compat = NULL; | |
179 | mutex_unlock(&sock_diag_table_mutex); | |
180 | } | |
181 | EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); | |
182 | ||
8dcf01fc | 183 | int sock_diag_register(const struct sock_diag_handler *hndl) |
8ef874bf PE |
184 | { |
185 | int err = 0; | |
186 | ||
6f8e4ad0 | 187 | if (hndl->family >= AF_MAX) |
8ef874bf PE |
188 | return -EINVAL; |
189 | ||
190 | mutex_lock(&sock_diag_table_mutex); | |
191 | if (sock_diag_handlers[hndl->family]) | |
192 | err = -EBUSY; | |
193 | else | |
194 | sock_diag_handlers[hndl->family] = hndl; | |
195 | mutex_unlock(&sock_diag_table_mutex); | |
196 | ||
197 | return err; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(sock_diag_register); | |
200 | ||
8dcf01fc | 201 | void sock_diag_unregister(const struct sock_diag_handler *hnld) |
8ef874bf PE |
202 | { |
203 | int family = hnld->family; | |
204 | ||
6f8e4ad0 | 205 | if (family >= AF_MAX) |
8ef874bf PE |
206 | return; |
207 | ||
208 | mutex_lock(&sock_diag_table_mutex); | |
209 | BUG_ON(sock_diag_handlers[family] != hnld); | |
210 | sock_diag_handlers[family] = NULL; | |
211 | mutex_unlock(&sock_diag_table_mutex); | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(sock_diag_unregister); | |
214 | ||
8ef874bf PE |
215 | static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
216 | { | |
217 | int err; | |
7b46866d | 218 | struct sock_diag_req *req = nlmsg_data(nlh); |
8dcf01fc | 219 | const struct sock_diag_handler *hndl; |
8ef874bf PE |
220 | |
221 | if (nlmsg_len(nlh) < sizeof(*req)) | |
222 | return -EINVAL; | |
223 | ||
6e601a53 MK |
224 | if (req->sdiag_family >= AF_MAX) |
225 | return -EINVAL; | |
226 | ||
8e904550 MK |
227 | if (sock_diag_handlers[req->sdiag_family] == NULL) |
228 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
229 | NETLINK_SOCK_DIAG, req->sdiag_family); | |
230 | ||
231 | mutex_lock(&sock_diag_table_mutex); | |
232 | hndl = sock_diag_handlers[req->sdiag_family]; | |
8ef874bf PE |
233 | if (hndl == NULL) |
234 | err = -ENOENT; | |
235 | else | |
236 | err = hndl->dump(skb, nlh); | |
8e904550 | 237 | mutex_unlock(&sock_diag_table_mutex); |
8ef874bf PE |
238 | |
239 | return err; | |
240 | } | |
241 | ||
242 | static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
243 | { | |
244 | int ret; | |
245 | ||
246 | switch (nlh->nlmsg_type) { | |
247 | case TCPDIAG_GETSOCK: | |
248 | case DCCPDIAG_GETSOCK: | |
249 | if (inet_rcv_compat == NULL) | |
250 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
aec8dc62 | 251 | NETLINK_SOCK_DIAG, AF_INET); |
8ef874bf PE |
252 | |
253 | mutex_lock(&sock_diag_table_mutex); | |
254 | if (inet_rcv_compat != NULL) | |
255 | ret = inet_rcv_compat(skb, nlh); | |
256 | else | |
257 | ret = -EOPNOTSUPP; | |
258 | mutex_unlock(&sock_diag_table_mutex); | |
259 | ||
260 | return ret; | |
261 | case SOCK_DIAG_BY_FAMILY: | |
262 | return __sock_diag_rcv_msg(skb, nlh); | |
263 | default: | |
264 | return -EINVAL; | |
265 | } | |
266 | } | |
267 | ||
268 | static DEFINE_MUTEX(sock_diag_mutex); | |
269 | ||
270 | static void sock_diag_rcv(struct sk_buff *skb) | |
271 | { | |
272 | mutex_lock(&sock_diag_mutex); | |
273 | netlink_rcv_skb(skb, &sock_diag_rcv_msg); | |
274 | mutex_unlock(&sock_diag_mutex); | |
275 | } | |
276 | ||
eb4cb008 CG |
277 | static int sock_diag_bind(struct net *net, int group) |
278 | { | |
279 | switch (group) { | |
280 | case SKNLGRP_INET_TCP_DESTROY: | |
281 | case SKNLGRP_INET_UDP_DESTROY: | |
282 | if (!sock_diag_handlers[AF_INET]) | |
283 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
284 | NETLINK_SOCK_DIAG, AF_INET); | |
285 | break; | |
286 | case SKNLGRP_INET6_TCP_DESTROY: | |
287 | case SKNLGRP_INET6_UDP_DESTROY: | |
288 | if (!sock_diag_handlers[AF_INET6]) | |
289 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
290 | NETLINK_SOCK_DIAG, AF_INET); | |
291 | break; | |
292 | } | |
293 | return 0; | |
294 | } | |
295 | ||
51d7cccf | 296 | static int __net_init diag_net_init(struct net *net) |
8ef874bf | 297 | { |
a31f2d17 | 298 | struct netlink_kernel_cfg cfg = { |
eb4cb008 | 299 | .groups = SKNLGRP_MAX, |
a31f2d17 | 300 | .input = sock_diag_rcv, |
eb4cb008 CG |
301 | .bind = sock_diag_bind, |
302 | .flags = NL_CFG_F_NONROOT_RECV, | |
a31f2d17 PNA |
303 | }; |
304 | ||
9f00d977 | 305 | net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); |
51d7cccf AV |
306 | return net->diag_nlsk == NULL ? -ENOMEM : 0; |
307 | } | |
308 | ||
309 | static void __net_exit diag_net_exit(struct net *net) | |
310 | { | |
311 | netlink_kernel_release(net->diag_nlsk); | |
312 | net->diag_nlsk = NULL; | |
313 | } | |
314 | ||
315 | static struct pernet_operations diag_net_ops = { | |
316 | .init = diag_net_init, | |
317 | .exit = diag_net_exit, | |
318 | }; | |
319 | ||
320 | static int __init sock_diag_init(void) | |
321 | { | |
eb4cb008 CG |
322 | broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0); |
323 | BUG_ON(!broadcast_wq); | |
51d7cccf | 324 | return register_pernet_subsys(&diag_net_ops); |
8ef874bf PE |
325 | } |
326 | ||
327 | static void __exit sock_diag_exit(void) | |
328 | { | |
51d7cccf | 329 | unregister_pernet_subsys(&diag_net_ops); |
eb4cb008 | 330 | destroy_workqueue(broadcast_wq); |
8ef874bf PE |
331 | } |
332 | ||
333 | module_init(sock_diag_init); | |
334 | module_exit(sock_diag_exit); | |
335 | MODULE_LICENSE("GPL"); | |
336 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); |