[SCSI] iscsi class, qla4xxx, iscsi_tcp: export local address

This patch exports the local address for the session. For
qla4xxx this is the ip of the hba's port. For software
this is the src addr of the socket.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: David C Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 98 insertions, 29 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 7ce177e30a5..da66fb524b5 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1870,18 +1870,22 @@ tcp_conn_alloc_fail:
 static void
 iscsi_tcp_release_conn(struct iscsi_conn *conn)
 {
+	struct iscsi_session *session = conn->session;
 	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	struct socket *sock = tcp_conn->sock;
 
-	if (!tcp_conn->sock)
+	if (!sock)
 		return;
 
-	sock_hold(tcp_conn->sock->sk);
+	sock_hold(sock->sk);
 	iscsi_conn_restore_callbacks(tcp_conn);
-	sock_put(tcp_conn->sock->sk);
+	sock_put(sock->sk);
 
-	sockfd_put(tcp_conn->sock);
+	spin_lock_bh(&session->lock);
 	tcp_conn->sock = NULL;
 	conn->recv_lock = NULL;
+	spin_unlock_bh(&session->lock);
+	sockfd_put(sock);
 }
 
 static void
@@ -1912,6 +1916,46 @@ iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 	tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
 }
 
+static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
+			      char *buf, int *port,
+			      int (*getname)(struct socket *, struct sockaddr *,
+					int *addrlen))
+{
+	struct sockaddr_storage *addr;
+	struct sockaddr_in6 *sin6;
+	struct sockaddr_in *sin;
+	int rc = 0, len;
+
+	addr = kmalloc(GFP_KERNEL, sizeof(*addr));
+	if (!addr)
+		return -ENOMEM;
+
+	if (getname(sock, (struct sockaddr *) addr, &len)) {
+		rc = -ENODEV;
+		goto free_addr;
+	}
+
+	switch (addr->ss_family) {
+	case AF_INET:
+		sin = (struct sockaddr_in *)addr;
+		spin_lock_bh(&conn->session->lock);
+		sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
+		*port = be16_to_cpu(sin->sin_port);
+		spin_unlock_bh(&conn->session->lock);
+		break;
+	case AF_INET6:
+		sin6 = (struct sockaddr_in6 *)addr;
+		spin_lock_bh(&conn->session->lock);
+		sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr));
+		*port = be16_to_cpu(sin6->sin6_port);
+		spin_unlock_bh(&conn->session->lock);
+		break;
+	}
+free_addr:
+	kfree(addr);
+	return rc;
+}
+
 static int
 iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
 		    struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
@@ -1929,10 +1973,24 @@ iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
 		printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
 		return -EEXIST;
 	}
+	/*
+	 * copy these values now because if we drop the session
+	 * userspace may still want to query the values since we will
+	 * be using them for the reconnect
+	 */
+	err = iscsi_tcp_get_addr(conn, sock, conn->portal_address,
+				 &conn->portal_port, kernel_getpeername);
+	if (err)
+		goto free_socket;
+
+	err = iscsi_tcp_get_addr(conn, sock, conn->local_address,
+				&conn->local_port, kernel_getsockname);
+	if (err)
+		goto free_socket;
 
 	err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 	if (err)
-		return err;
+		goto free_socket;
 
 	/* bind iSCSI connection and socket */
 	tcp_conn->sock = sock;
@@ -1956,8 +2014,11 @@ iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
 	 * set receive state machine into initial state
 	 */
 	tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
-
 	return 0;
+
+free_socket:
+	sockfd_put(sock);
+	return err;
 }
 
 /* called with host lock */
@@ -2077,33 +2138,18 @@ iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
 			 enum iscsi_param param, char *buf)
 {
 	struct iscsi_conn *conn = cls_conn->dd_data;
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct inet_sock *inet;
-	struct ipv6_pinfo *np;
-	struct sock *sk;
 	int len;
 
 	switch(param) {
 	case ISCSI_PARAM_CONN_PORT:
-		if (!tcp_conn->sock)
-			return -EINVAL;
-
-		inet = inet_sk(tcp_conn->sock->sk);
-		len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
+		spin_lock_bh(&conn->session->lock);
+		len = sprintf(buf, "%hu\n", conn->portal_port);
+		spin_unlock_bh(&conn->session->lock);
 		break;
 	case ISCSI_PARAM_CONN_ADDRESS:
-		if (!tcp_conn->sock)
-			return -EINVAL;
-
-		sk = tcp_conn->sock->sk;
-		if (sk->sk_family == PF_INET) {
-			inet = inet_sk(sk);
-			len = sprintf(buf, NIPQUAD_FMT "\n",
-				      NIPQUAD(inet->daddr));
-		} else {
-			np = inet6_sk(sk);
-			len = sprintf(buf, NIP6_FMT "\n", NIP6(np->daddr));
-		}
+		spin_lock_bh(&conn->session->lock);
+		len = sprintf(buf, "%s\n", conn->portal_address);
+		spin_unlock_bh(&conn->session->lock);
 		break;
 	default:
 		return iscsi_conn_get_param(cls_conn, param, buf);
@@ -2112,6 +2158,29 @@ iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
 	return len;
 }
 
+static int
+iscsi_tcp_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
+			 char *buf)
+{
+        struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+	int len;
+
+	switch (param) {
+	case ISCSI_HOST_PARAM_IPADDRESS:
+		spin_lock_bh(&session->lock);
+		if (!session->leadconn)
+			len = -ENODEV;
+		else
+			len = sprintf(buf, "%s\n",
+				     session->leadconn->local_address);
+		spin_unlock_bh(&session->lock);
+		break;
+	default:
+		return iscsi_host_get_param(shost, param, buf);
+	}
+	return len;
+}
+
 static void
 iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 {
@@ -2233,7 +2302,7 @@ static struct iscsi_transport iscsi_tcp_transport = {
 				  ISCSI_TARGET_NAME | ISCSI_TPGT |
 				  ISCSI_USERNAME | ISCSI_PASSWORD |
 				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN,
-	.host_param_mask	= ISCSI_HOST_HWADDRESS |
+	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 				  ISCSI_HOST_INITIATOR_NAME,
 	.host_template		= &iscsi_sht,
 	.conndata_size		= sizeof(struct iscsi_conn),
@@ -2252,7 +2321,7 @@ static struct iscsi_transport iscsi_tcp_transport = {
 	.start_conn		= iscsi_conn_start,
 	.stop_conn		= iscsi_tcp_conn_stop,
 	/* iscsi host params */
-	.get_host_param		= iscsi_host_get_param,
+	.get_host_param		= iscsi_tcp_host_get_param,
 	.set_host_param		= iscsi_host_set_param,
 	/* IO */
 	.send_pdu		= iscsi_conn_send_pdu,