passt: Add support for multiple instances in different network namespaces

...sharing the same filesystem. Instead of a fixed path for the UNIX
domain socket, passt now uses a path with a counter, probing for
existing instances, and picking the first free one.

The demo script is updated accordingly -- it can now be started several
times to create multiple namespaces with an instance of passt each,
with addressing reflecting separate subnets, and NDP proxying between
them.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/util.h b/util.h
index 7d0704c..3e24c9a 100644
--- a/util.h
+++ b/util.h
@@ -29,6 +29,9 @@ void debug(const char *format, ...);
 #define MAX(x, y)		(((x) > (y)) ? (x) : (y))
 #endif
 
+#define STRINGIFY(x)	#x
+#define STR(x)		STRINGIFY(x)
+
 #define ARRAY_SIZE(a)		((int)(sizeof(a) / sizeof((a)[0])))
 
 #define IN_INTERVAL(a, b, x)	((x) >= (a) && (x) <= (b))
@@ -37,6 +40,10 @@ void debug(const char *format, ...);
 
 #define PORT_IS_EPHEMERAL(port) ((port) >= (1 << 15) + (1 << 14)) /* RFC 6335 */
 
+#include <linux/ipv6.h>
+#include <net/if.h>
+#include <linux/ip.h>
+
 uint16_t csum_fold(uint32_t sum);
 uint16_t csum_ip4(void *buf, size_t len);
 void csum_tcp4(struct iphdr *iph);