3 #include <linux/filter.h>
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>
11 #include <linux/kernel.h>
12 #include <linux/tcp.h>
13 #include <linux/workqueue.h>
14 #include <linux/nospec.h>
15 #include <linux/cookie.h>
16 #include <linux/inet_diag.h>
17 #include <linux/sock_diag.h>
19 static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
20 static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
21 static DEFINE_MUTEX(sock_diag_table_mutex);
22 static struct workqueue_struct *broadcast_wq;
24 DEFINE_COOKIE(sock_cookie);
26 u64 __sock_gen_cookie(struct sock *sk)
28 u64 res = atomic64_read(&sk->sk_cookie);
31 u64 new = gen_cookie_next(&sock_cookie);
33 atomic64_cmpxchg(&sk->sk_cookie, res, new);
35 /* Another thread might have changed sk_cookie before us. */
36 res = atomic64_read(&sk->sk_cookie);
41 int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie)
45 if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
48 res = sock_gen_cookie(sk);
49 if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1])
54 EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
56 void sock_diag_save_cookie(struct sock *sk, __u32 *cookie)
58 u64 res = sock_gen_cookie(sk);
61 cookie[1] = (u32)(res >> 32);
63 EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
65 int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
67 u32 mem[SK_MEMINFO_VARS];
69 sk_get_meminfo(sk, mem);
71 return nla_put(skb, attrtype, sizeof(mem), &mem);
73 EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
75 int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
76 struct sk_buff *skb, int attrtype)
78 struct sock_fprog_kern *fprog;
79 struct sk_filter *filter;
84 if (!may_report_filterinfo) {
85 nla_reserve(skb, attrtype, 0);
90 filter = rcu_dereference(sk->sk_filter);
94 fprog = filter->prog->orig_prog;
98 flen = bpf_classic_proglen(fprog);
100 attr = nla_reserve(skb, attrtype, flen);
106 memcpy(nla_data(attr), fprog->filter, flen);
111 EXPORT_SYMBOL(sock_diag_put_filterinfo);
113 struct broadcast_sk {
115 struct work_struct work;
118 static size_t sock_diag_nlmsg_size(void)
120 return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
121 + nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
122 + nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
125 static void sock_diag_broadcast_destroy_work(struct work_struct *work)
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;
132 const enum sknetlink_groups group = sock_diag_destroy_group(sk);
135 WARN_ON(group == SKNLGRP_NONE);
137 skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
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);
148 nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
157 void sock_diag_broadcast_destroy(struct sock *sk)
159 /* Note, this function is often called from an interrupt context. */
160 struct broadcast_sk *bsk =
161 kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
163 return sk_destruct(sk);
165 INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
166 queue_work(broadcast_wq, &bsk->work);
169 void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
171 mutex_lock(&sock_diag_table_mutex);
172 inet_rcv_compat = fn;
173 mutex_unlock(&sock_diag_table_mutex);
175 EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
177 void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
179 mutex_lock(&sock_diag_table_mutex);
180 inet_rcv_compat = NULL;
181 mutex_unlock(&sock_diag_table_mutex);
183 EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
185 int sock_diag_register(const struct sock_diag_handler *hndl)
189 if (hndl->family >= AF_MAX)
192 mutex_lock(&sock_diag_table_mutex);
193 if (sock_diag_handlers[hndl->family])
196 sock_diag_handlers[hndl->family] = hndl;
197 mutex_unlock(&sock_diag_table_mutex);
201 EXPORT_SYMBOL_GPL(sock_diag_register);
203 void sock_diag_unregister(const struct sock_diag_handler *hnld)
205 int family = hnld->family;
207 if (family >= AF_MAX)
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);
215 EXPORT_SYMBOL_GPL(sock_diag_unregister);
217 static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh)
220 struct sock_diag_req *req = nlmsg_data(nlh);
221 const struct sock_diag_handler *hndl;
223 if (nlmsg_len(nlh) < sizeof(*req))
226 if (req->sdiag_family >= AF_MAX)
228 req->sdiag_family = array_index_nospec(req->sdiag_family, AF_MAX);
230 if (sock_diag_handlers[req->sdiag_family] == NULL)
231 sock_load_diag_module(req->sdiag_family, 0);
233 mutex_lock(&sock_diag_table_mutex);
234 hndl = sock_diag_handlers[req->sdiag_family];
237 else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
238 err = hndl->dump(skb, nlh);
239 else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
240 err = hndl->destroy(skb, nlh);
243 mutex_unlock(&sock_diag_table_mutex);
248 static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
249 struct netlink_ext_ack *extack)
253 switch (nlh->nlmsg_type) {
254 case TCPDIAG_GETSOCK:
255 case DCCPDIAG_GETSOCK:
256 if (inet_rcv_compat == NULL)
257 sock_load_diag_module(AF_INET, 0);
259 mutex_lock(&sock_diag_table_mutex);
260 if (inet_rcv_compat != NULL)
261 ret = inet_rcv_compat(skb, nlh);
264 mutex_unlock(&sock_diag_table_mutex);
267 case SOCK_DIAG_BY_FAMILY:
269 return __sock_diag_cmd(skb, nlh);
275 static DEFINE_MUTEX(sock_diag_mutex);
277 static void sock_diag_rcv(struct sk_buff *skb)
279 mutex_lock(&sock_diag_mutex);
280 netlink_rcv_skb(skb, &sock_diag_rcv_msg);
281 mutex_unlock(&sock_diag_mutex);
284 static int sock_diag_bind(struct net *net, int group)
287 case SKNLGRP_INET_TCP_DESTROY:
288 case SKNLGRP_INET_UDP_DESTROY:
289 if (!sock_diag_handlers[AF_INET])
290 sock_load_diag_module(AF_INET, 0);
292 case SKNLGRP_INET6_TCP_DESTROY:
293 case SKNLGRP_INET6_UDP_DESTROY:
294 if (!sock_diag_handlers[AF_INET6])
295 sock_load_diag_module(AF_INET6, 0);
301 int sock_diag_destroy(struct sock *sk, int err)
303 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
306 if (!sk->sk_prot->diag_destroy)
309 return sk->sk_prot->diag_destroy(sk, err);
311 EXPORT_SYMBOL_GPL(sock_diag_destroy);
313 static int __net_init diag_net_init(struct net *net)
315 struct netlink_kernel_cfg cfg = {
316 .groups = SKNLGRP_MAX,
317 .input = sock_diag_rcv,
318 .bind = sock_diag_bind,
319 .flags = NL_CFG_F_NONROOT_RECV,
322 net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
323 return net->diag_nlsk == NULL ? -ENOMEM : 0;
326 static void __net_exit diag_net_exit(struct net *net)
328 netlink_kernel_release(net->diag_nlsk);
329 net->diag_nlsk = NULL;
332 static struct pernet_operations diag_net_ops = {
333 .init = diag_net_init,
334 .exit = diag_net_exit,
337 static int __init sock_diag_init(void)
339 broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
340 BUG_ON(!broadcast_wq);
341 return register_pernet_subsys(&diag_net_ops);
343 device_initcall(sock_diag_init);