rxrpc: Randomise epoch and starting client conn ID values

Create a random epoch value rather than a time-based one on startup and set
the top bit to indicate that this is the case.

Also create a random starting client connection ID value.  This will be
incremented from here as new client connections are created.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/rxrpc/packet.h b/include/rxrpc/packet.h
index b2017440b765..3c6128e1fdbe 100644
--- a/include/rxrpc/packet.h
+++ b/include/rxrpc/packet.h
@@ -24,6 +24,7 @@ typedef __be32	rxrpc_serial_net_t; /* on-the-wire Rx message serial number */
  */
 struct rxrpc_wire_header {
         __be32          epoch;          /* client boot timestamp */
+#define RXRPC_RANDOM_EPOCH      0x80000000      /* Random if set, date-based if not */
 
         __be32          cid;            /* connection and channel ID */
 #define RXRPC_MAXCALLS          4                       /* max active calls per conn */