Bluetooth: move l2cap_sock_bind()/listen() to l2cap_sock.c

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 135 insertions, 0 deletions

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 20efd240a786..ef9a60fda495 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -62,6 +62,141 @@ static void l2cap_sock_timeout(unsigned long arg)
         sock_put(sk);
 }
 
+static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
+{
+        struct sock *sk;
+        struct hlist_node *node;
+        sk_for_each(sk, node, &l2cap_sk_list.head)
+                if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
+                        goto found;
+        sk = NULL;
+found:
+        return sk;
+}
+
+static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
+{
+        struct sock *sk = sock->sk;
+        struct sockaddr_l2 la;
+        int len, err = 0;
+
+        BT_DBG("sk %p", sk);
+
+        if (!addr || addr->sa_family != AF_BLUETOOTH)
+                return -EINVAL;
+
+        memset(&la, 0, sizeof(la));
+        len = min_t(unsigned int, sizeof(la), alen);
+        memcpy(&la, addr, len);
+
+        if (la.l2_cid)
+                return -EINVAL;
+
+        lock_sock(sk);
+
+        if (sk->sk_state != BT_OPEN) {
+                err = -EBADFD;
+                goto done;
+        }
+
+        if (la.l2_psm) {
+                __u16 psm = __le16_to_cpu(la.l2_psm);
+
+                /* PSM must be odd and lsb of upper byte must be 0 */
+                if ((psm & 0x0101) != 0x0001) {
+                        err = -EINVAL;
+                        goto done;
+                }
+
+                /* Restrict usage of well-known PSMs */
+                if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
+                        err = -EACCES;
+                        goto done;
+                }
+        }
+
+        write_lock_bh(&l2cap_sk_list.lock);
+
+        if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
+                err = -EADDRINUSE;
+        } else {
+                /* Save source address */
+                bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
+                l2cap_pi(sk)->psm   = la.l2_psm;
+                l2cap_pi(sk)->sport = la.l2_psm;
+                sk->sk_state = BT_BOUND;
+
+                if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
+                                        __le16_to_cpu(la.l2_psm) == 0x0003)
+                        l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
+        }
+
+        write_unlock_bh(&l2cap_sk_list.lock);
+
+done:
+        release_sock(sk);
+        return err;
+}
+
+static int l2cap_sock_listen(struct socket *sock, int backlog)
+{
+        struct sock *sk = sock->sk;
+        int err = 0;
+
+        BT_DBG("sk %p backlog %d", sk, backlog);
+
+        lock_sock(sk);
+
+        if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
+                        || sk->sk_state != BT_BOUND) {
+                err = -EBADFD;
+                goto done;
+        }
+
+        switch (l2cap_pi(sk)->mode) {
+        case L2CAP_MODE_BASIC:
+                break;
+        case L2CAP_MODE_ERTM:
+        case L2CAP_MODE_STREAMING:
+                if (!disable_ertm)
+                        break;
+                /* fall through */
+        default:
+                err = -ENOTSUPP;
+                goto done;
+        }
+
+        if (!l2cap_pi(sk)->psm) {
+                bdaddr_t *src = &bt_sk(sk)->src;
+                u16 psm;
+
+                err = -EINVAL;
+
+                write_lock_bh(&l2cap_sk_list.lock);
+
+                for (psm = 0x1001; psm < 0x1100; psm += 2)
+                        if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
+                                l2cap_pi(sk)->psm   = cpu_to_le16(psm);
+                                l2cap_pi(sk)->sport = cpu_to_le16(psm);
+                                err = 0;
+                                break;
+                        }
+
+                write_unlock_bh(&l2cap_sk_list.lock);
+
+                if (err < 0)
+                        goto done;
+        }
+
+        sk->sk_max_ack_backlog = backlog;
+        sk->sk_ack_backlog = 0;
+        sk->sk_state = BT_LISTEN;
+
+done:
+        release_sock(sk);
+        return err;
+}
+
 static int l2cap_sock_release(struct socket *sock)
 {
         struct sock *sk = sock->sk;