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-rw-r--r--net/phonet/socket.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/net/phonet/socket.c b/net/phonet/socket.c
index 7c91f739f13..4c29a23e900 100644
--- a/net/phonet/socket.c
+++ b/net/phonet/socket.c
@@ -565,3 +565,91 @@ const struct file_operations pn_sock_seq_fops = {
.release = seq_release_net,
};
#endif
+
+static struct {
+ struct sock *sk[256];
+} pnres;
+
+/*
+ * Find and hold socket based on resource.
+ */
+struct sock *pn_find_sock_by_res(struct net *net, u8 res)
+{
+ struct sock *sk;
+
+ if (!net_eq(net, &init_net))
+ return NULL;
+
+ rcu_read_lock();
+ sk = rcu_dereference(pnres.sk[res]);
+ if (sk)
+ sock_hold(sk);
+ rcu_read_unlock();
+ return sk;
+}
+
+static DEFINE_MUTEX(resource_mutex);
+
+int pn_sock_bind_res(struct sock *sk, u8 res)
+{
+ int ret = -EADDRINUSE;
+
+ if (!net_eq(sock_net(sk), &init_net))
+ return -ENOIOCTLCMD;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (pn_socket_autobind(sk->sk_socket))
+ return -EAGAIN;
+
+ mutex_lock(&resource_mutex);
+ if (pnres.sk[res] == NULL) {
+ sock_hold(sk);
+ rcu_assign_pointer(pnres.sk[res], sk);
+ ret = 0;
+ }
+ mutex_unlock(&resource_mutex);
+ return ret;
+}
+
+int pn_sock_unbind_res(struct sock *sk, u8 res)
+{
+ int ret = -ENOENT;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ mutex_lock(&resource_mutex);
+ if (pnres.sk[res] == sk) {
+ rcu_assign_pointer(pnres.sk[res], NULL);
+ ret = 0;
+ }
+ mutex_unlock(&resource_mutex);
+
+ if (ret == 0) {
+ synchronize_rcu();
+ sock_put(sk);
+ }
+ return ret;
+}
+
+void pn_sock_unbind_all_res(struct sock *sk)
+{
+ unsigned res, match = 0;
+
+ mutex_lock(&resource_mutex);
+ for (res = 0; res < 256; res++) {
+ if (pnres.sk[res] == sk) {
+ rcu_assign_pointer(pnres.sk[res], NULL);
+ match++;
+ }
+ }
+ mutex_unlock(&resource_mutex);
+
+ if (match == 0)
+ return;
+ synchronize_rcu();
+ while (match > 0) {
+ sock_put(sk);
+ match--;
+ }
+}