[RFC 09/13] nfs: Bind to srcaddr in rpcb_create.

[greearb@candelatech.com]

From: Ben Greear <greearb@candelatech.com>

This more properly clones the existing client connection
settings, allowing rpc calls to take advantage of routing
rules based on source IP addresses.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 net/sunrpc/rpcb_clnt.c |   31 ++++++++++++++++++++++++++++---
 net/sunrpc/sunrpc.h    |   45 +++++++++++++++++++++++++++++++++++++++++++++
 net/sunrpc/xprtsock.c  |   42 ------------------------------------------
 3 files changed, 73 insertions(+), 45 deletions(-)

diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index a70acae..462ee2a 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -31,6 +31,7 @@
 #include <linux/sunrpc/xprtsock.h>
 
 #include "netns.h"
+#include "sunrpc.h"
 
 #ifdef RPC_DEBUG
 # define RPCDBG_FACILITY	RPCDBG_BIND
@@ -346,12 +347,14 @@ out:
 }
 
 static struct rpc_clnt *rpcb_create(struct net *net, const char *hostname,
-				    struct sockaddr *srvaddr, size_t salen,
-				    int proto, u32 version)
+				    struct sockaddr *srvaddr,
+				    size_t salen, int proto, u32 version,
+				    struct sockaddr *srcaddr)
 {
 	struct rpc_create_args args = {
 		.net		= net,
 		.protocol	= proto,
+		.saddress	= srcaddr,
 		.address	= srvaddr,
 		.addrsize	= salen,
 		.servername	= hostname,
@@ -655,16 +658,38 @@ void rpcb_getport_async(struct rpc_task *task)
 	struct rpc_task	*child;
 	struct sockaddr_storage addr;
 	struct sockaddr *sap = (struct sockaddr *)&addr;
+	struct sockaddr_storage srcaddr;
+	struct sockaddr *srcaddra = NULL;
 	size_t salen;
 	int status;
+	struct sock_xprt *sxprt;
 
 	rcu_read_lock();
 	do {
 		clnt = rpcb_find_transport_owner(task->tk_client);
 		xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
 	} while (xprt == NULL);
+
+	sxprt = container_of(xprt, struct sock_xprt, xprt);
 	rcu_read_unlock();
 
+	/* We just want to bind to the IP, not the port */
+	memset(&srcaddr, 0, sizeof(srcaddr));
+	srcaddr.ss_family = sxprt->srcaddr.ss_family;
+	if (sxprt->srcaddr.ss_family == AF_INET) {
+		struct sockaddr_in *si = (struct sockaddr_in *)(&srcaddr);
+		struct sockaddr_in *si2;
+		si2 = (struct sockaddr_in *)(&sxprt->srcaddr);
+		si->sin_addr.s_addr = si2->sin_addr.s_addr;
+		srcaddra = (struct sockaddr *)(&srcaddr);
+	} else if (sxprt->srcaddr.ss_family == AF_INET6) {
+		struct sockaddr_in6 *si = (struct sockaddr_in6 *)(&srcaddr);
+		struct sockaddr_in6 *si2;
+		si2 = (struct sockaddr_in6 *)(&sxprt->srcaddr);
+		memcpy(&si->sin6_addr, &si2->sin6_addr, sizeof(si2->sin6_addr));
+		srcaddra = (struct sockaddr *)(&srcaddr);
+	}
+
 	dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
 		task->tk_pid, __func__,
 		xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
@@ -719,7 +744,7 @@ void rpcb_getport_async(struct rpc_task *task)
 		task->tk_pid, __func__, bind_version);
 
 	rpcb_clnt = rpcb_create(xprt->xprt_net, xprt->servername, sap, salen,
-				xprt->prot, bind_version);
+				xprt->prot, bind_version, srcaddra);
 	if (IS_ERR(rpcb_clnt)) {
 		status = PTR_ERR(rpcb_clnt);
 		dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
diff --git a/net/sunrpc/sunrpc.h b/net/sunrpc/sunrpc.h
index 14c9f6d..08f2ec5 100644
--- a/net/sunrpc/sunrpc.h
+++ b/net/sunrpc/sunrpc.h
@@ -37,6 +37,51 @@ struct rpc_buffer {
 	char	data[];
 };
 
+struct sock_xprt {
+	struct rpc_xprt		xprt;
+
+	/*
+	 * Network layer
+	 */
+	struct socket		*sock;
+	struct sock		*inet;
+
+	/*
+	 * State of TCP reply receive
+	 */
+	__be32			tcp_fraghdr,
+				tcp_xid,
+				tcp_calldir;
+
+	u32			tcp_offset,
+				tcp_reclen;
+
+	unsigned long		tcp_copied,
+				tcp_flags;
+
+	/*
+	 * Connection of transports
+	 */
+	struct delayed_work	connect_worker;
+	struct sockaddr_storage	srcaddr;
+	unsigned short		srcport;
+
+	/*
+	 * UDP socket buffer size parameters
+	 */
+	size_t			rcvsize,
+				sndsize;
+
+	/*
+	 * Saved socket callback addresses
+	 */
+	void			(*old_data_ready)(struct sock *, int);
+	void			(*old_state_change)(struct sock *);
+	void			(*old_write_space)(struct sock *);
+	void			(*old_error_report)(struct sock *);
+};
+
+
 static inline int rpc_reply_expected(struct rpc_task *task)
 {
 	return (task->tk_msg.rpc_proc != NULL) &&
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 32a016e..9cb9f16 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -213,48 +213,6 @@ static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 }
 #endif
 
-struct sock_xprt {
-	struct rpc_xprt		xprt;
-
-	/*
-	 * Network layer
-	 */
-	struct socket *		sock;
-	struct sock *		inet;
-
-	/*
-	 * State of TCP reply receive
-	 */
-	__be32			tcp_fraghdr,
-				tcp_xid,
-				tcp_calldir;
-
-	u32			tcp_offset,
-				tcp_reclen;
-
-	unsigned long		tcp_copied,
-				tcp_flags;
-
-	/*
-	 * Connection of transports
-	 */
-	struct delayed_work	connect_worker;
-	struct sockaddr_storage	srcaddr;
-	unsigned short		srcport;
-
-	/*
-	 * UDP socket buffer size parameters
-	 */
-	size_t			rcvsize,
-				sndsize;
-
-	/*
-	 * Saved socket callback addresses
-	 */
-	void			(*old_data_ready)(struct sock *, int);
-	void			(*old_state_change)(struct sock *);
-	void			(*old_write_space)(struct sock *);
-};
 
 /*
  * TCP receive state flags
-- 
1.7.3.4