tcp, udp, util: Enforce 24-bit limit on socket numbers

This should never happen, but there are no formal guarantees: ensure
socket numbers are below SOCKET_MAX.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/passt.h b/passt.h
index 8344fca..3a62b15 100644
--- a/passt.h
+++ b/passt.h
@@ -45,7 +45,9 @@ union epoll_ref;
 union epoll_ref {
 	struct {
 		int32_t		proto:8,
-				s:24;
+#define SOCKET_REF_BITS		24
+#define SOCKET_MAX		(1 << SOCKET_REF_BITS)
+				s:SOCKET_REF_BITS;
 		union {
 			union tcp_epoll_ref tcp;
 			union udp_epoll_ref udp;