SUNRPC: export per-transport rpcbind netid's

The rpcbind (v3+) netid is provided by each RPC client transport. This fixes
an omission in IPv6 rpcbind client support, and enables future extension.
Signed-off-by: Tom Talpey <tmt@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

include/linux/sunrpc/xprt.h

@@ -56,6 +56,7 @@ enum rpc_display_format_t {
 	RPC_DISPLAY_HEX_ADDR,
 	RPC_DISPLAY_HEX_PORT,
 	RPC_DISPLAY_UNIVERSAL_ADDR,
+	RPC_DISPLAY_NETID,
 	RPC_DISPLAY_MAX,
 };
 

net/sunrpc/rpcb_clnt.c

@@ -388,8 +388,7 @@ void rpcb_getport_async(struct rpc_task *task)
 	map->r_prot = xprt->prot;
 	map->r_port = 0;
 	map->r_xprt = xprt_get(xprt);
-	map->r_netid = (xprt->prot == IPPROTO_TCP) ? RPCBIND_NETID_TCP :
-						     RPCBIND_NETID_UDP;
+	map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
 	memcpy(map->r_addr,
 	       rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR),
 	       sizeof(map->r_addr));

net/sunrpc/xprtsock.c

@@ -337,6 +337,10 @@ static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt)
 				ntohs(addr->sin_port) & 0xff);
 	}
 	xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_NETID] =
+		kstrdup(xprt->prot == IPPROTO_UDP ?
+			RPCBIND_NETID_UDP : RPCBIND_NETID_TCP, GFP_KERNEL);
 }
 
 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt)
@@ -398,6 +402,10 @@ static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt)
 				ntohs(addr->sin6_port) & 0xff);
 	}
 	xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_NETID] =
+		kstrdup(xprt->prot == IPPROTO_UDP ?
+			RPCBIND_NETID_UDP6 : RPCBIND_NETID_TCP6, GFP_KERNEL);
 }
 
 static void xs_free_peer_addresses(struct rpc_xprt *xprt)