rxrpc: Support network namespacing

Support network namespacing in AF_RXRPC with the following changes:

 (1) All the local endpoint, peer and call lists, locks, counters, etc. are
     moved into the per-namespace record.

 (2) All the connection tracking is moved into the per-namespace record
     with the exception of the client connection ID tree, which is kept
     global so that connection IDs are kept unique per-machine.

 (3) Each namespace gets its own epoch.  This allows each network namespace
     to pretend to be a separate client machine.

 (4) The /proc/net/rxrpc_xxx files are now called /proc/net/rxrpc/xxx and
     the contents reflect the namespace.

fs/afs/ should be okay with this patch as it explicitly requires the current
net namespace to be init_net to permit a mount to proceed at the moment.  It
will, however, need updating so that cells, IP addresses and DNS records are
per-namespace also.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 5 deletions

diff --git a/net/rxrpc/conn_service.c b/net/rxrpc/conn_service.c
index eef551f40dc2..edfc633f7d5e 100644
--- a/net/rxrpc/conn_service.c
+++ b/net/rxrpc/conn_service.c
@@ -121,7 +121,8 @@ replace_old_connection:
  * Preallocate a service connection.  The connection is placed on the proc and
  * reap lists so that we don't have to get the lock from BH context.
  */
-struct rxrpc_connection *rxrpc_prealloc_service_connection(gfp_t gfp)
+struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *rxnet,
+							   gfp_t gfp)
 {
 	struct rxrpc_connection *conn = rxrpc_alloc_connection(gfp);
 
@@ -132,10 +133,10 @@ struct rxrpc_connection *rxrpc_prealloc_service_connection(gfp_t gfp)
 		conn->state = RXRPC_CONN_SERVICE_PREALLOC;
 		atomic_set(&conn->usage, 2);
 
-		write_lock(&rxrpc_connection_lock);
-		list_add_tail(&conn->link, &rxrpc_connections);
-		list_add_tail(&conn->proc_link, &rxrpc_connection_proc_list);
-		write_unlock(&rxrpc_connection_lock);
+		write_lock(&rxnet->conn_lock);
+		list_add_tail(&conn->link, &rxnet->service_conns);
+		list_add_tail(&conn->proc_link, &rxnet->conn_proc_list);
+		write_unlock(&rxnet->conn_lock);
 
 		trace_rxrpc_conn(conn, rxrpc_conn_new_service,
 				 atomic_read(&conn->usage),