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Commit | Line | Data |
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b6191aee PG |
1 | /* License: GPL */ |
2 | ||
8ef874bf PE |
3 | #include <linux/mutex.h> |
4 | #include <linux/socket.h> | |
5 | #include <linux/skbuff.h> | |
6 | #include <net/netlink.h> | |
7 | #include <net/net_namespace.h> | |
8 | #include <linux/module.h> | |
5d2e5f27 | 9 | #include <net/sock.h> |
eb4cb008 CG |
10 | #include <linux/kernel.h> |
11 | #include <linux/tcp.h> | |
12 | #include <linux/workqueue.h> | |
8ef874bf PE |
13 | |
14 | #include <linux/inet_diag.h> | |
15 | #include <linux/sock_diag.h> | |
16 | ||
8dcf01fc | 17 | static const struct sock_diag_handler *sock_diag_handlers[AF_MAX]; |
8ef874bf PE |
18 | static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); |
19 | static DEFINE_MUTEX(sock_diag_table_mutex); | |
eb4cb008 | 20 | static struct workqueue_struct *broadcast_wq; |
8ef874bf | 21 | |
33cf7c90 | 22 | static u64 sock_gen_cookie(struct sock *sk) |
f65c1b53 | 23 | { |
33cf7c90 ED |
24 | while (1) { |
25 | u64 res = atomic64_read(&sk->sk_cookie); | |
26 | ||
27 | if (res) | |
28 | return res; | |
29 | res = atomic64_inc_return(&sock_net(sk)->cookie_gen); | |
30 | atomic64_cmpxchg(&sk->sk_cookie, 0, res); | |
31 | } | |
32 | } | |
33 | ||
34 | int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie) | |
35 | { | |
36 | u64 res; | |
37 | ||
38 | if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE) | |
f65c1b53 | 39 | return 0; |
33cf7c90 ED |
40 | |
41 | res = sock_gen_cookie(sk); | |
42 | if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1]) | |
43 | return -ESTALE; | |
44 | ||
45 | return 0; | |
f65c1b53 PE |
46 | } |
47 | EXPORT_SYMBOL_GPL(sock_diag_check_cookie); | |
48 | ||
33cf7c90 | 49 | void sock_diag_save_cookie(struct sock *sk, __u32 *cookie) |
f65c1b53 | 50 | { |
33cf7c90 ED |
51 | u64 res = sock_gen_cookie(sk); |
52 | ||
53 | cookie[0] = (u32)res; | |
54 | cookie[1] = (u32)(res >> 32); | |
f65c1b53 PE |
55 | } |
56 | EXPORT_SYMBOL_GPL(sock_diag_save_cookie); | |
57 | ||
5d2e5f27 PE |
58 | int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) |
59 | { | |
7b46866d | 60 | u32 mem[SK_MEMINFO_VARS]; |
5d2e5f27 PE |
61 | |
62 | mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); | |
63 | mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; | |
64 | mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); | |
65 | mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; | |
66 | mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; | |
67 | mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; | |
68 | mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); | |
d594e987 | 69 | mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; |
15239302 | 70 | mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); |
5d2e5f27 | 71 | |
7b46866d | 72 | return nla_put(skb, attrtype, sizeof(mem), &mem); |
5d2e5f27 PE |
73 | } |
74 | EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); | |
75 | ||
a53b72c8 | 76 | int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk, |
e8d9612c ND |
77 | struct sk_buff *skb, int attrtype) |
78 | { | |
a3ea269b | 79 | struct sock_fprog_kern *fprog; |
e8d9612c | 80 | struct sk_filter *filter; |
a3ea269b DB |
81 | struct nlattr *attr; |
82 | unsigned int flen; | |
e8d9612c ND |
83 | int err = 0; |
84 | ||
a53b72c8 | 85 | if (!may_report_filterinfo) { |
e8d9612c ND |
86 | nla_reserve(skb, attrtype, 0); |
87 | return 0; | |
88 | } | |
89 | ||
90 | rcu_read_lock(); | |
e8d9612c | 91 | filter = rcu_dereference(sk->sk_filter); |
a3ea269b DB |
92 | if (!filter) |
93 | goto out; | |
e8d9612c | 94 | |
7ae457c1 | 95 | fprog = filter->prog->orig_prog; |
b382c086 DB |
96 | if (!fprog) |
97 | goto out; | |
98 | ||
009937e7 | 99 | flen = bpf_classic_proglen(fprog); |
a3ea269b DB |
100 | |
101 | attr = nla_reserve(skb, attrtype, flen); | |
e8d9612c ND |
102 | if (attr == NULL) { |
103 | err = -EMSGSIZE; | |
104 | goto out; | |
105 | } | |
106 | ||
a3ea269b | 107 | memcpy(nla_data(attr), fprog->filter, flen); |
e8d9612c ND |
108 | out: |
109 | rcu_read_unlock(); | |
110 | return err; | |
111 | } | |
112 | EXPORT_SYMBOL(sock_diag_put_filterinfo); | |
113 | ||
eb4cb008 CG |
114 | struct broadcast_sk { |
115 | struct sock *sk; | |
116 | struct work_struct work; | |
117 | }; | |
118 | ||
119 | static size_t sock_diag_nlmsg_size(void) | |
120 | { | |
121 | return NLMSG_ALIGN(sizeof(struct inet_diag_msg) | |
122 | + nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */ | |
6ed46d12 | 123 | + nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */ |
eb4cb008 CG |
124 | } |
125 | ||
126 | static void sock_diag_broadcast_destroy_work(struct work_struct *work) | |
127 | { | |
128 | struct broadcast_sk *bsk = | |
129 | container_of(work, struct broadcast_sk, work); | |
130 | struct sock *sk = bsk->sk; | |
131 | const struct sock_diag_handler *hndl; | |
132 | struct sk_buff *skb; | |
133 | const enum sknetlink_groups group = sock_diag_destroy_group(sk); | |
134 | int err = -1; | |
135 | ||
136 | WARN_ON(group == SKNLGRP_NONE); | |
137 | ||
138 | skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL); | |
139 | if (!skb) | |
140 | goto out; | |
141 | ||
142 | mutex_lock(&sock_diag_table_mutex); | |
143 | hndl = sock_diag_handlers[sk->sk_family]; | |
144 | if (hndl && hndl->get_info) | |
145 | err = hndl->get_info(skb, sk); | |
146 | mutex_unlock(&sock_diag_table_mutex); | |
147 | ||
148 | if (!err) | |
149 | nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group, | |
150 | GFP_KERNEL); | |
151 | else | |
152 | kfree_skb(skb); | |
153 | out: | |
154 | sk_destruct(sk); | |
155 | kfree(bsk); | |
156 | } | |
157 | ||
158 | void sock_diag_broadcast_destroy(struct sock *sk) | |
159 | { | |
160 | /* Note, this function is often called from an interrupt context. */ | |
161 | struct broadcast_sk *bsk = | |
162 | kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC); | |
163 | if (!bsk) | |
164 | return sk_destruct(sk); | |
165 | bsk->sk = sk; | |
166 | INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work); | |
167 | queue_work(broadcast_wq, &bsk->work); | |
168 | } | |
169 | ||
8ef874bf PE |
170 | void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) |
171 | { | |
172 | mutex_lock(&sock_diag_table_mutex); | |
173 | inet_rcv_compat = fn; | |
174 | mutex_unlock(&sock_diag_table_mutex); | |
175 | } | |
176 | EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); | |
177 | ||
178 | void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) | |
179 | { | |
180 | mutex_lock(&sock_diag_table_mutex); | |
181 | inet_rcv_compat = NULL; | |
182 | mutex_unlock(&sock_diag_table_mutex); | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); | |
185 | ||
8dcf01fc | 186 | int sock_diag_register(const struct sock_diag_handler *hndl) |
8ef874bf PE |
187 | { |
188 | int err = 0; | |
189 | ||
6f8e4ad0 | 190 | if (hndl->family >= AF_MAX) |
8ef874bf PE |
191 | return -EINVAL; |
192 | ||
193 | mutex_lock(&sock_diag_table_mutex); | |
194 | if (sock_diag_handlers[hndl->family]) | |
195 | err = -EBUSY; | |
196 | else | |
197 | sock_diag_handlers[hndl->family] = hndl; | |
198 | mutex_unlock(&sock_diag_table_mutex); | |
199 | ||
200 | return err; | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(sock_diag_register); | |
203 | ||
8dcf01fc | 204 | void sock_diag_unregister(const struct sock_diag_handler *hnld) |
8ef874bf PE |
205 | { |
206 | int family = hnld->family; | |
207 | ||
6f8e4ad0 | 208 | if (family >= AF_MAX) |
8ef874bf PE |
209 | return; |
210 | ||
211 | mutex_lock(&sock_diag_table_mutex); | |
212 | BUG_ON(sock_diag_handlers[family] != hnld); | |
213 | sock_diag_handlers[family] = NULL; | |
214 | mutex_unlock(&sock_diag_table_mutex); | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(sock_diag_unregister); | |
217 | ||
64be0aed | 218 | static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh) |
8ef874bf PE |
219 | { |
220 | int err; | |
7b46866d | 221 | struct sock_diag_req *req = nlmsg_data(nlh); |
8dcf01fc | 222 | const struct sock_diag_handler *hndl; |
8ef874bf PE |
223 | |
224 | if (nlmsg_len(nlh) < sizeof(*req)) | |
225 | return -EINVAL; | |
226 | ||
6e601a53 MK |
227 | if (req->sdiag_family >= AF_MAX) |
228 | return -EINVAL; | |
229 | ||
8e904550 MK |
230 | if (sock_diag_handlers[req->sdiag_family] == NULL) |
231 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
232 | NETLINK_SOCK_DIAG, req->sdiag_family); | |
233 | ||
234 | mutex_lock(&sock_diag_table_mutex); | |
235 | hndl = sock_diag_handlers[req->sdiag_family]; | |
8ef874bf PE |
236 | if (hndl == NULL) |
237 | err = -ENOENT; | |
64be0aed | 238 | else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY) |
8ef874bf | 239 | err = hndl->dump(skb, nlh); |
64be0aed LC |
240 | else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy) |
241 | err = hndl->destroy(skb, nlh); | |
242 | else | |
243 | err = -EOPNOTSUPP; | |
8e904550 | 244 | mutex_unlock(&sock_diag_table_mutex); |
8ef874bf PE |
245 | |
246 | return err; | |
247 | } | |
248 | ||
249 | static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
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 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
aec8dc62 | 258 | NETLINK_SOCK_DIAG, AF_INET); |
8ef874bf PE |
259 | |
260 | mutex_lock(&sock_diag_table_mutex); | |
261 | if (inet_rcv_compat != NULL) | |
262 | ret = inet_rcv_compat(skb, nlh); | |
263 | else | |
264 | ret = -EOPNOTSUPP; | |
265 | mutex_unlock(&sock_diag_table_mutex); | |
266 | ||
267 | return ret; | |
268 | case SOCK_DIAG_BY_FAMILY: | |
64be0aed LC |
269 | case SOCK_DESTROY: |
270 | return __sock_diag_cmd(skb, nlh); | |
8ef874bf PE |
271 | default: |
272 | return -EINVAL; | |
273 | } | |
274 | } | |
275 | ||
276 | static DEFINE_MUTEX(sock_diag_mutex); | |
277 | ||
278 | static void sock_diag_rcv(struct sk_buff *skb) | |
279 | { | |
280 | mutex_lock(&sock_diag_mutex); | |
281 | netlink_rcv_skb(skb, &sock_diag_rcv_msg); | |
282 | mutex_unlock(&sock_diag_mutex); | |
283 | } | |
284 | ||
eb4cb008 CG |
285 | static int sock_diag_bind(struct net *net, int group) |
286 | { | |
287 | switch (group) { | |
288 | case SKNLGRP_INET_TCP_DESTROY: | |
289 | case SKNLGRP_INET_UDP_DESTROY: | |
290 | if (!sock_diag_handlers[AF_INET]) | |
291 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
292 | NETLINK_SOCK_DIAG, AF_INET); | |
293 | break; | |
294 | case SKNLGRP_INET6_TCP_DESTROY: | |
295 | case SKNLGRP_INET6_UDP_DESTROY: | |
296 | if (!sock_diag_handlers[AF_INET6]) | |
297 | request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
298 | NETLINK_SOCK_DIAG, AF_INET); | |
299 | break; | |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
64be0aed LC |
304 | int sock_diag_destroy(struct sock *sk, int err) |
305 | { | |
306 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
307 | return -EPERM; | |
308 | ||
309 | if (!sk->sk_prot->diag_destroy) | |
310 | return -EOPNOTSUPP; | |
311 | ||
312 | return sk->sk_prot->diag_destroy(sk, err); | |
313 | } | |
314 | EXPORT_SYMBOL_GPL(sock_diag_destroy); | |
315 | ||
51d7cccf | 316 | static int __net_init diag_net_init(struct net *net) |
8ef874bf | 317 | { |
a31f2d17 | 318 | struct netlink_kernel_cfg cfg = { |
eb4cb008 | 319 | .groups = SKNLGRP_MAX, |
a31f2d17 | 320 | .input = sock_diag_rcv, |
eb4cb008 CG |
321 | .bind = sock_diag_bind, |
322 | .flags = NL_CFG_F_NONROOT_RECV, | |
a31f2d17 PNA |
323 | }; |
324 | ||
9f00d977 | 325 | net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); |
51d7cccf AV |
326 | return net->diag_nlsk == NULL ? -ENOMEM : 0; |
327 | } | |
328 | ||
329 | static void __net_exit diag_net_exit(struct net *net) | |
330 | { | |
331 | netlink_kernel_release(net->diag_nlsk); | |
332 | net->diag_nlsk = NULL; | |
333 | } | |
334 | ||
335 | static struct pernet_operations diag_net_ops = { | |
336 | .init = diag_net_init, | |
337 | .exit = diag_net_exit, | |
338 | }; | |
339 | ||
340 | static int __init sock_diag_init(void) | |
341 | { | |
eb4cb008 CG |
342 | broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0); |
343 | BUG_ON(!broadcast_wq); | |
51d7cccf | 344 | return register_pernet_subsys(&diag_net_ops); |
8ef874bf | 345 | } |
b6191aee | 346 | device_initcall(sock_diag_init); |