Commit | Line | Data |
---|---|---|
b6191aee PG |
1 | /* License: GPL */ |
2 | ||
b6459415 | 3 | #include <linux/filter.h> |
8ef874bf PE |
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> | |
5d2e5f27 | 10 | #include <net/sock.h> |
eb4cb008 CG |
11 | #include <linux/kernel.h> |
12 | #include <linux/tcp.h> | |
13 | #include <linux/workqueue.h> | |
66b51b0a | 14 | #include <linux/nospec.h> |
92acdc58 | 15 | #include <linux/cookie.h> |
8ef874bf PE |
16 | #include <linux/inet_diag.h> |
17 | #include <linux/sock_diag.h> | |
18 | ||
8dcf01fc | 19 | static const struct sock_diag_handler *sock_diag_handlers[AF_MAX]; |
8ef874bf PE |
20 | static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); |
21 | static DEFINE_MUTEX(sock_diag_table_mutex); | |
eb4cb008 | 22 | static struct workqueue_struct *broadcast_wq; |
8ef874bf | 23 | |
92acdc58 DB |
24 | DEFINE_COOKIE(sock_cookie); |
25 | ||
26 | u64 __sock_gen_cookie(struct sock *sk) | |
f65c1b53 | 27 | { |
4ebf802c | 28 | u64 res = atomic64_read(&sk->sk_cookie); |
33cf7c90 | 29 | |
4ebf802c ED |
30 | if (!res) { |
31 | u64 new = gen_cookie_next(&sock_cookie); | |
32 | ||
32634819 ED |
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); | |
33cf7c90 | 37 | } |
4ebf802c | 38 | return res; |
33cf7c90 ED |
39 | } |
40 | ||
41 | int 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) | |
f65c1b53 | 46 | return 0; |
33cf7c90 ED |
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; | |
f65c1b53 PE |
53 | } |
54 | EXPORT_SYMBOL_GPL(sock_diag_check_cookie); | |
55 | ||
33cf7c90 | 56 | void sock_diag_save_cookie(struct sock *sk, __u32 *cookie) |
f65c1b53 | 57 | { |
33cf7c90 ED |
58 | u64 res = sock_gen_cookie(sk); |
59 | ||
60 | cookie[0] = (u32)res; | |
61 | cookie[1] = (u32)(res >> 32); | |
f65c1b53 PE |
62 | } |
63 | EXPORT_SYMBOL_GPL(sock_diag_save_cookie); | |
64 | ||
5d2e5f27 PE |
65 | int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) |
66 | { | |
7b46866d | 67 | u32 mem[SK_MEMINFO_VARS]; |
5d2e5f27 | 68 | |
a2d133b1 | 69 | sk_get_meminfo(sk, mem); |
5d2e5f27 | 70 | |
7b46866d | 71 | return nla_put(skb, attrtype, sizeof(mem), &mem); |
5d2e5f27 PE |
72 | } |
73 | EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); | |
74 | ||
a53b72c8 | 75 | int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk, |
e8d9612c ND |
76 | struct sk_buff *skb, int attrtype) |
77 | { | |
a3ea269b | 78 | struct sock_fprog_kern *fprog; |
e8d9612c | 79 | struct sk_filter *filter; |
a3ea269b DB |
80 | struct nlattr *attr; |
81 | unsigned int flen; | |
e8d9612c ND |
82 | int err = 0; |
83 | ||
a53b72c8 | 84 | if (!may_report_filterinfo) { |
e8d9612c ND |
85 | nla_reserve(skb, attrtype, 0); |
86 | return 0; | |
87 | } | |
88 | ||
89 | rcu_read_lock(); | |
e8d9612c | 90 | filter = rcu_dereference(sk->sk_filter); |
a3ea269b DB |
91 | if (!filter) |
92 | goto out; | |
e8d9612c | 93 | |
7ae457c1 | 94 | fprog = filter->prog->orig_prog; |
b382c086 DB |
95 | if (!fprog) |
96 | goto out; | |
97 | ||
009937e7 | 98 | flen = bpf_classic_proglen(fprog); |
a3ea269b DB |
99 | |
100 | attr = nla_reserve(skb, attrtype, flen); | |
e8d9612c ND |
101 | if (attr == NULL) { |
102 | err = -EMSGSIZE; | |
103 | goto out; | |
104 | } | |
105 | ||
a3ea269b | 106 | memcpy(nla_data(attr), fprog->filter, flen); |
e8d9612c ND |
107 | out: |
108 | rcu_read_unlock(); | |
109 | return err; | |
110 | } | |
111 | EXPORT_SYMBOL(sock_diag_put_filterinfo); | |
112 | ||
eb4cb008 CG |
113 | struct broadcast_sk { |
114 | struct sock *sk; | |
115 | struct work_struct work; | |
116 | }; | |
117 | ||
118 | static 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 */ | |
6ed46d12 | 122 | + nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */ |
eb4cb008 CG |
123 | } |
124 | ||
125 | static 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); | |
152 | out: | |
153 | sk_destruct(sk); | |
154 | kfree(bsk); | |
155 | } | |
156 | ||
157 | void 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 | ||
8ef874bf PE |
169 | void 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 | } | |
175 | EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); | |
176 | ||
177 | void 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 | } | |
183 | EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); | |
184 | ||
8dcf01fc | 185 | int sock_diag_register(const struct sock_diag_handler *hndl) |
8ef874bf PE |
186 | { |
187 | int err = 0; | |
188 | ||
6f8e4ad0 | 189 | if (hndl->family >= AF_MAX) |
8ef874bf PE |
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 | } | |
201 | EXPORT_SYMBOL_GPL(sock_diag_register); | |
202 | ||
8dcf01fc | 203 | void sock_diag_unregister(const struct sock_diag_handler *hnld) |
8ef874bf PE |
204 | { |
205 | int family = hnld->family; | |
206 | ||
6f8e4ad0 | 207 | if (family >= AF_MAX) |
8ef874bf PE |
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 | } | |
215 | EXPORT_SYMBOL_GPL(sock_diag_unregister); | |
216 | ||
64be0aed | 217 | static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh) |
8ef874bf PE |
218 | { |
219 | int err; | |
7b46866d | 220 | struct sock_diag_req *req = nlmsg_data(nlh); |
8dcf01fc | 221 | const struct sock_diag_handler *hndl; |
8ef874bf PE |
222 | |
223 | if (nlmsg_len(nlh) < sizeof(*req)) | |
224 | return -EINVAL; | |
225 | ||
6e601a53 MK |
226 | if (req->sdiag_family >= AF_MAX) |
227 | return -EINVAL; | |
66b51b0a | 228 | req->sdiag_family = array_index_nospec(req->sdiag_family, AF_MAX); |
6e601a53 | 229 | |
8e904550 | 230 | if (sock_diag_handlers[req->sdiag_family] == NULL) |
bf2ae2e4 | 231 | sock_load_diag_module(req->sdiag_family, 0); |
8e904550 MK |
232 | |
233 | mutex_lock(&sock_diag_table_mutex); | |
234 | hndl = sock_diag_handlers[req->sdiag_family]; | |
8ef874bf PE |
235 | if (hndl == NULL) |
236 | err = -ENOENT; | |
64be0aed | 237 | else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY) |
8ef874bf | 238 | err = hndl->dump(skb, nlh); |
64be0aed LC |
239 | else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy) |
240 | err = hndl->destroy(skb, nlh); | |
241 | else | |
242 | err = -EOPNOTSUPP; | |
8e904550 | 243 | mutex_unlock(&sock_diag_table_mutex); |
8ef874bf PE |
244 | |
245 | return err; | |
246 | } | |
247 | ||
2d4bc933 JB |
248 | static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, |
249 | struct netlink_ext_ack *extack) | |
8ef874bf PE |
250 | { |
251 | int ret; | |
252 | ||
253 | switch (nlh->nlmsg_type) { | |
254 | case TCPDIAG_GETSOCK: | |
255 | case DCCPDIAG_GETSOCK: | |
256 | if (inet_rcv_compat == NULL) | |
bf2ae2e4 | 257 | sock_load_diag_module(AF_INET, 0); |
8ef874bf PE |
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: | |
64be0aed LC |
268 | case SOCK_DESTROY: |
269 | return __sock_diag_cmd(skb, nlh); | |
8ef874bf PE |
270 | default: |
271 | return -EINVAL; | |
272 | } | |
273 | } | |
274 | ||
275 | static DEFINE_MUTEX(sock_diag_mutex); | |
276 | ||
277 | static 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 | ||
eb4cb008 CG |
284 | static 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]) | |
bf2ae2e4 | 290 | sock_load_diag_module(AF_INET, 0); |
eb4cb008 CG |
291 | break; |
292 | case SKNLGRP_INET6_TCP_DESTROY: | |
293 | case SKNLGRP_INET6_UDP_DESTROY: | |
294 | if (!sock_diag_handlers[AF_INET6]) | |
bf2ae2e4 | 295 | sock_load_diag_module(AF_INET6, 0); |
eb4cb008 CG |
296 | break; |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
64be0aed LC |
301 | int 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 | } | |
311 | EXPORT_SYMBOL_GPL(sock_diag_destroy); | |
312 | ||
51d7cccf | 313 | static int __net_init diag_net_init(struct net *net) |
8ef874bf | 314 | { |
a31f2d17 | 315 | struct netlink_kernel_cfg cfg = { |
eb4cb008 | 316 | .groups = SKNLGRP_MAX, |
a31f2d17 | 317 | .input = sock_diag_rcv, |
eb4cb008 CG |
318 | .bind = sock_diag_bind, |
319 | .flags = NL_CFG_F_NONROOT_RECV, | |
a31f2d17 PNA |
320 | }; |
321 | ||
9f00d977 | 322 | net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); |
51d7cccf AV |
323 | return net->diag_nlsk == NULL ? -ENOMEM : 0; |
324 | } | |
325 | ||
326 | static void __net_exit diag_net_exit(struct net *net) | |
327 | { | |
328 | netlink_kernel_release(net->diag_nlsk); | |
329 | net->diag_nlsk = NULL; | |
330 | } | |
331 | ||
332 | static struct pernet_operations diag_net_ops = { | |
333 | .init = diag_net_init, | |
334 | .exit = diag_net_exit, | |
335 | }; | |
336 | ||
337 | static int __init sock_diag_init(void) | |
338 | { | |
eb4cb008 CG |
339 | broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0); |
340 | BUG_ON(!broadcast_wq); | |
51d7cccf | 341 | return register_pernet_subsys(&diag_net_ops); |
8ef874bf | 342 | } |
b6191aee | 343 | device_initcall(sock_diag_init); |