passt: Introduce ICMP echo proxy

It's nice to be able to confirm connectivity using ICMP or ICMPv6
echo requests, and "ping" sockets on Linux (IPPROTO_ICMP datagram)
allow us to do that without any special capability.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/icmp.h b/icmp.h
new file mode 100644
index 0000000..7820fbe
--- /dev/null
+++ b/icmp.h
@@ -0,0 +1,20 @@
+#ifndef ICMP_H
+#define ICMP_H
+
+struct ctx;
+
+void icmp_sock_handler(struct ctx *c, int s, uint32_t events);
+void icmp_tap_handler(struct ctx *c, int af, void *addr, char *in, size_t len);
+int icmp_sock_init(struct ctx *c);
+
+/**
+ * struct icmp_ctx - Execution context for ICMP routines
+ * @s4:		ICMP socket number
+ * @s6:		ICMPv6 socket number
+ */
+struct icmp_ctx {
+	int s4;
+	int s6;
+};
+
+#endif /* ICMP_H */