net: make getname() functions return length rather than use int* para…

…meter

Changes since v1:
Added changes in these files:
    drivers/infiniband/hw/usnic/usnic_transport.c
    drivers/staging/lustre/lnet/lnet/lib-socket.c
    drivers/target/iscsi/iscsi_target_login.c
    drivers/vhost/net.c
    fs/dlm/lowcomms.c
    fs/ocfs2/cluster/tcp.c
    security/tomoyo/network.c

Before:
All these functions either return a negative error indicator,
or store length of sockaddr into "int *socklen" parameter
and return zero on success.

"int *socklen" parameter is awkward. For example, if caller does not
care, it still needs to provide on-stack storage for the value
it does not need.

None of the many FOO_getname() functions of various protocols
ever used old value of *socklen. They always just overwrite it.

This change drops this parameter, and makes all these functions, on success,
return length of sockaddr. It's always >= 0 and can be differentiated
from an error.

Tests in callers are changed from "if (err)" to "if (err < 0)", where needed.

rpc_sockname() lost "int buflen" parameter, since its only use was
to be passed to kernel_getsockname() as &buflen and subsequently
not used in any way.

Userspace API is not changed.

    text    data     bss      dec     hex filename
30108430 2633624  873672 33615726 200ef6e vmlinux.before.o
30108109 2633612  873672 33615393 200ee21 vmlinux.o

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: David S. Miller <davem@davemloft.net>
CC: linux-kernel@vger.kernel.org
CC: netdev@vger.kernel.org
CC: linux-bluetooth@vger.kernel.org
CC: linux-decnet-user@lists.sourceforge.net
CC: linux-wireless@vger.kernel.org
CC: linux-rdma@vger.kernel.org
CC: linux-sctp@vger.kernel.org
CC: linux-nfs@vger.kernel.org
CC: linux-x25@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/hw/usnic/usnic_transport.c

@@ -174,14 +174,13 @@ void usnic_transport_put_socket(struct socket *sock)
 int usnic_transport_sock_get_addr(struct socket *sock, int *proto,
 					uint32_t *addr, uint16_t *port)
 {
-	int len;
 	int err;
 	struct sockaddr_in sock_addr;
 
 	err = sock->ops->getname(sock,
 				(struct sockaddr *)&sock_addr,
-				&len, 0);
-	if (err)
+				0);
+	if (err < 0)
 		return err;
 
 	if (sock_addr.sin_family != AF_INET)

drivers/isdn/mISDN/socket.c

@@ -560,7 +560,7 @@ data_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 
 static int
 data_sock_getname(struct socket *sock, struct sockaddr *addr,
-		  int *addr_len, int peer)
+		  int peer)
 {
 	struct sockaddr_mISDN	*maddr = (struct sockaddr_mISDN *) addr;
 	struct sock		*sk = sock->sk;
@@ -570,14 +570,13 @@ data_sock_getname(struct socket *sock, struct sockaddr *addr,
 
 	lock_sock(sk);
 
-	*addr_len = sizeof(*maddr);
 	maddr->family = AF_ISDN;
 	maddr->dev = _pms(sk)->dev->id;
 	maddr->channel = _pms(sk)->ch.nr;
 	maddr->sapi = _pms(sk)->ch.addr & 0xff;
 	maddr->tei = (_pms(sk)->ch.addr >> 8) & 0xff;
 	release_sock(sk);
-	return 0;
+	return sizeof(*maddr);
 }
 
 static const struct proto_ops data_sock_ops = {

drivers/net/ppp/pppoe.c

@@ -714,7 +714,7 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
 }
 
 static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
-		  int *usockaddr_len, int peer)
+		  int peer)
 {
 	int len = sizeof(struct sockaddr_pppox);
 	struct sockaddr_pppox sp;
@@ -726,9 +726,7 @@ static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
 
 	memcpy(uaddr, &sp, len);
 
-	*usockaddr_len = len;
-
-	return 0;
+	return len;
 }
 
 static int pppoe_ioctl(struct socket *sock, unsigned int cmd,

drivers/net/ppp/pptp.c

@@ -483,7 +483,7 @@ static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr,
 }
 
 static int pptp_getname(struct socket *sock, struct sockaddr *uaddr,
-	int *usockaddr_len, int peer)
+	int peer)
 {
 	int len = sizeof(struct sockaddr_pppox);
 	struct sockaddr_pppox sp;
@@ -496,9 +496,7 @@ static int pptp_getname(struct socket *sock, struct sockaddr *uaddr,
 
 	memcpy(uaddr, &sp, len);
 
-	*usockaddr_len = len;
-
-	return 0;
+	return len;
 }
 
 static int pptp_release(struct socket *sock)

drivers/scsi/iscsi_tcp.c

@@ -732,7 +732,7 @@ static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
 	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 	struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
 	struct sockaddr_in6 addr;
-	int rc, len;
+	int rc;
 
 	switch(param) {
 	case ISCSI_PARAM_CONN_PORT:
@@ -745,12 +745,12 @@ static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
 		}
 		if (param == ISCSI_PARAM_LOCAL_PORT)
 			rc = kernel_getsockname(tcp_sw_conn->sock,
-						(struct sockaddr *)&addr, &len);
+						(struct sockaddr *)&addr);
 		else
 			rc = kernel_getpeername(tcp_sw_conn->sock,
-						(struct sockaddr *)&addr, &len);
+						(struct sockaddr *)&addr);
 		spin_unlock_bh(&conn->session->frwd_lock);
-		if (rc)
+		if (rc < 0)
 			return rc;
 
 		return iscsi_conn_get_addr_param((struct sockaddr_storage *)
@@ -771,7 +771,7 @@ static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
 	struct iscsi_tcp_conn *tcp_conn;
 	struct iscsi_sw_tcp_conn *tcp_sw_conn;
 	struct sockaddr_in6 addr;
-	int rc, len;
+	int rc;
 
 	switch (param) {
 	case ISCSI_HOST_PARAM_IPADDRESS:
@@ -793,9 +793,9 @@ static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
 		}
 
 		rc = kernel_getsockname(tcp_sw_conn->sock,
-					(struct sockaddr *)&addr, &len);
+					(struct sockaddr *)&addr);
 		spin_unlock_bh(&session->frwd_lock);
-		if (rc)
+		if (rc < 0)
 			return rc;
 
 		return iscsi_conn_get_addr_param((struct sockaddr_storage *)

drivers/soc/qcom/qmi_interface.c

@@ -586,15 +586,14 @@ static struct socket *qmi_sock_create(struct qmi_handle *qmi,
 				      struct sockaddr_qrtr *sq)
 {
 	struct socket *sock;
-	int sl = sizeof(*sq);
 	int ret;
 
 	ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
 			       PF_QIPCRTR, &sock);
 	if (ret < 0)
 		return ERR_PTR(ret);
 
-	ret = kernel_getsockname(sock, (struct sockaddr *)sq, &sl);
+	ret = kernel_getsockname(sock, (struct sockaddr *)sq);
 	if (ret < 0) {
 		sock_release(sock);
 		return ERR_PTR(ret);

drivers/staging/ipx/af_ipx.c

@@ -1577,16 +1577,14 @@ static int ipx_connect(struct socket *sock, struct sockaddr *uaddr,
 
 
 static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
-			int *uaddr_len, int peer)
+			int peer)
 {
 	struct ipx_address *addr;
 	struct sockaddr_ipx sipx;
 	struct sock *sk = sock->sk;
 	struct ipx_sock *ipxs = ipx_sk(sk);
 	int rc;
 
-	*uaddr_len = sizeof(struct sockaddr_ipx);
-
 	lock_sock(sk);
 	if (peer) {
 		rc = -ENOTCONN;
@@ -1620,7 +1618,7 @@ static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
 	sipx.sipx_zero	 = 0;
 	memcpy(uaddr, &sipx, sizeof(sipx));
 
-	rc = 0;
+	rc = sizeof(struct sockaddr_ipx);
 out:
 	release_sock(sk);
 	return rc;

drivers/staging/irda/net/af_irda.c

@@ -697,7 +697,7 @@ static int irda_discover_daddr_and_lsap_sel(struct irda_sock *self, char *name)
  *
  */
 static int irda_getname(struct socket *sock, struct sockaddr *uaddr,
-			int *uaddr_len, int peer)
+			int peer)
 {
 	struct sockaddr_irda saddr;
 	struct sock *sk = sock->sk;
@@ -720,11 +720,9 @@ static int irda_getname(struct socket *sock, struct sockaddr *uaddr,
 	pr_debug("%s(), tsap_sel = %#x\n", __func__, saddr.sir_lsap_sel);
 	pr_debug("%s(), addr = %08x\n", __func__, saddr.sir_addr);
 
-	/* uaddr_len come to us uninitialised */
-	*uaddr_len = sizeof (struct sockaddr_irda);
-	memcpy(uaddr, &saddr, *uaddr_len);
+	memcpy(uaddr, &saddr, sizeof (struct sockaddr_irda));
 
-	return 0;
+	return sizeof (struct sockaddr_irda);
 }
 
 /*

drivers/staging/lustre/lnet/lnet/lib-socket.c

@@ -448,14 +448,13 @@ int
 lnet_sock_getaddr(struct socket *sock, bool remote, __u32 *ip, int *port)
 {
 	struct sockaddr_in sin;
-	int len = sizeof(sin);
 	int rc;
 
 	if (remote)
-		rc = kernel_getpeername(sock, (struct sockaddr *)&sin, &len);
+		rc = kernel_getpeername(sock, (struct sockaddr *)&sin);
 	else
-		rc = kernel_getsockname(sock, (struct sockaddr *)&sin, &len);
-	if (rc) {
+		rc = kernel_getsockname(sock, (struct sockaddr *)&sin);
+	if (rc < 0) {
 		CERROR("Error %d getting sock %s IP/port\n",
 		       rc, remote ? "peer" : "local");
 		return rc;

drivers/target/iscsi/iscsi_target_login.c

@@ -1020,7 +1020,7 @@ int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 	struct socket *new_sock, *sock = np->np_socket;
 	struct sockaddr_in sock_in;
 	struct sockaddr_in6 sock_in6;
-	int rc, err;
+	int rc;
 
 	rc = kernel_accept(sock, &new_sock, 0);
 	if (rc < 0)
@@ -1033,8 +1033,8 @@ int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 		memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
 
 		rc = conn->sock->ops->getname(conn->sock,
-				(struct sockaddr *)&sock_in6, &err, 1);
-		if (!rc) {
+				(struct sockaddr *)&sock_in6, 1);
+		if (rc >= 0) {
 			if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
 				memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
 			} else {
@@ -1047,8 +1047,8 @@ int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 		}
 
 		rc = conn->sock->ops->getname(conn->sock,
-				(struct sockaddr *)&sock_in6, &err, 0);
-		if (!rc) {
+				(struct sockaddr *)&sock_in6, 0);
+		if (rc >= 0) {
 			if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
 				memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
 			} else {
@@ -1063,13 +1063,13 @@ int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 		memset(&sock_in, 0, sizeof(struct sockaddr_in));
 
 		rc = conn->sock->ops->getname(conn->sock,
-				(struct sockaddr *)&sock_in, &err, 1);
-		if (!rc)
+				(struct sockaddr *)&sock_in, 1);
+		if (rc >= 0)
 			memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
 
 		rc = conn->sock->ops->getname(conn->sock,
-				(struct sockaddr *)&sock_in, &err, 0);
-		if (!rc)
+				(struct sockaddr *)&sock_in, 0);
+		if (rc >= 0)
 			memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
 	}
 

drivers/vhost/net.c

@@ -1038,7 +1038,7 @@ static struct socket *get_raw_socket(int fd)
 		struct sockaddr_ll sa;
 		char  buf[MAX_ADDR_LEN];
 	} uaddr;
-	int uaddr_len = sizeof uaddr, r;
+	int r;
 	struct socket *sock = sockfd_lookup(fd, &r);
 
 	if (!sock)
@@ -1050,9 +1050,8 @@ static struct socket *get_raw_socket(int fd)
 		goto err;
 	}
 
-	r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa,
-			       &uaddr_len, 0);
-	if (r)
+	r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, 0);
+	if (r < 0)
 		goto err;
 
 	if (uaddr.sa.sll_family != AF_PACKET) {

fs/dlm/lowcomms.c

@@ -482,7 +482,6 @@ static void lowcomms_error_report(struct sock *sk)
 {
 	struct connection *con;
 	struct sockaddr_storage saddr;
-	int buflen;
 	void (*orig_report)(struct sock *) = NULL;
 
 	read_lock_bh(&sk->sk_callback_lock);
@@ -492,7 +491,7 @@ static void lowcomms_error_report(struct sock *sk)
 
 	orig_report = listen_sock.sk_error_report;
 	if (con->sock == NULL ||
-	    kernel_getpeername(con->sock, (struct sockaddr *)&saddr, &buflen)) {
+	    kernel_getpeername(con->sock, (struct sockaddr *)&saddr) < 0) {
 		printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
 				   "sending to node %d, port %d, "
 				   "sk_err=%d/%d\n", dlm_our_nodeid(),
@@ -757,8 +756,8 @@ static int tcp_accept_from_sock(struct connection *con)
 
 	/* Get the connected socket's peer */
 	memset(&peeraddr, 0, sizeof(peeraddr));
-	if (newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr,
-				  &len, 2)) {
+	len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2);
+	if (len < 0) {
 		result = -ECONNABORTED;
 		goto accept_err;
 	}

fs/ocfs2/cluster/tcp.c

@@ -1819,7 +1819,7 @@ int o2net_register_hb_callbacks(void)
 
 static int o2net_accept_one(struct socket *sock, int *more)
 {
-	int ret, slen;
+	int ret;
 	struct sockaddr_in sin;
 	struct socket *new_sock = NULL;
 	struct o2nm_node *node = NULL;
@@ -1864,9 +1864,7 @@ static int o2net_accept_one(struct socket *sock, int *more)
 		goto out;
 	}
 
-	slen = sizeof(sin);
-	ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
-				       &slen, 1);
+	ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, 1);
 	if (ret < 0)
 		goto out;
 

include/linux/net.h

@@ -146,7 +146,7 @@ struct proto_ops {
 				      struct socket *newsock, int flags, bool kern);
 	int		(*getname)   (struct socket *sock,
 				      struct sockaddr *addr,
-				      int *sockaddr_len, int peer);
+				      int peer);
 	__poll_t	(*poll)	     (struct file *file, struct socket *sock,
 				      struct poll_table_struct *wait);
 	int		(*ioctl)     (struct socket *sock, unsigned int cmd,
@@ -294,10 +294,8 @@ int kernel_listen(struct socket *sock, int backlog);
 int kernel_accept(struct socket *sock, struct socket **newsock, int flags);
 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
 		   int flags);
-int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
-		       int *addrlen);
-int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
-		       int *addrlen);
+int kernel_getsockname(struct socket *sock, struct sockaddr *addr);
+int kernel_getpeername(struct socket *sock, struct sockaddr *addr);
 int kernel_getsockopt(struct socket *sock, int level, int optname, char *optval,
 		      int *optlen);
 int kernel_setsockopt(struct socket *sock, int level, int optname, char *optval,

include/net/inet_common.h

@@ -32,7 +32,7 @@ int inet_shutdown(struct socket *sock, int how);
 int inet_listen(struct socket *sock, int backlog);
 void inet_sock_destruct(struct sock *sk);
 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
-int inet_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
+int inet_getname(struct socket *sock, struct sockaddr *uaddr,
 		 int peer);
 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 int inet_ctl_sock_create(struct sock **sk, unsigned short family,

include/net/ipv6.h

@@ -1056,7 +1056,7 @@ void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
 
 int inet6_release(struct socket *sock);
 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
-int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
+int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 		  int peer);
 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 

include/net/sock.h

@@ -1584,7 +1584,7 @@ int sock_no_bind(struct socket *, struct sockaddr *, int);
 int sock_no_connect(struct socket *, struct sockaddr *, int, int);
 int sock_no_socketpair(struct socket *, struct socket *);
 int sock_no_accept(struct socket *, struct socket *, int, bool);
-int sock_no_getname(struct socket *, struct sockaddr *, int *, int);
+int sock_no_getname(struct socket *, struct sockaddr *, int);
 __poll_t sock_no_poll(struct file *, struct socket *,
 			  struct poll_table_struct *);
 int sock_no_ioctl(struct socket *, unsigned int, unsigned long);