executor: add network packet injection for NetBSD

* Initial Commit

* working build of network packet fuzzing

* Add missed csource file

* pkg/csource: fix build

* executor/common_bsd.h: Add comment stating reason for ifconfig create

3 files changed, 26 insertions, 7 deletions

diff --git a/executor/common_bsd.h b/executor/common_bsd.h
index d39d2aded..e483a41d1 100644
--- a/executor/common_bsd.h
+++ b/executor/common_bsd.h
@@ -37,7 +37,7 @@ static uintptr_t syz_open_pts(void)
 
 #endif // GOOS_openbsd
 
-#if GOOS_freebsd || GOOS_openbsd
+#if GOOS_freebsd || GOOS_openbsd || GOOS_netbsd
 
 #if SYZ_EXECUTOR || SYZ_TUN_ENABLE
 
@@ -123,7 +123,18 @@ static void initialize_tun(int tun_id)
 
 	char tun_device[sizeof(TUN_DEVICE)];
 	snprintf_check(tun_device, sizeof(tun_device), TUN_DEVICE, tun_id);
+
+	char tun_iface[sizeof(TUN_IFACE)];
+	snprintf_check(tun_iface, sizeof(tun_iface), TUN_IFACE, tun_id);
+
+#if GOOS_netbsd
+	// open(2) doesn't create an new tap/tun interface node
+	// so we use ifconfig to create the node. Might be casued due to regression
+	execute_command(0, "ifconfig %s destroy", tun_iface);
+	execute_command(0, "ifconfig %s create", tun_iface);
+#else
 	execute_command(0, "ifconfig %s destroy", tun_device);
+#endif
 
 	tunfd = open(tun_device, O_RDWR | O_NONBLOCK);
 #if GOOS_freebsd
@@ -148,31 +159,36 @@ static void initialize_tun(int tun_id)
 	close(tunfd);
 	tunfd = kTunFd;
 
-	char tun_iface[sizeof(TUN_IFACE)];
-	snprintf_check(tun_iface, sizeof(tun_iface), TUN_IFACE, tun_id);
-
 	char local_mac[sizeof(LOCAL_MAC)];
 	snprintf_check(local_mac, sizeof(local_mac), LOCAL_MAC);
+
+	// Set the MAC address of the interface to LOCAL_MAC
 #if GOOS_openbsd
 	execute_command(1, "ifconfig %s lladdr %s", tun_iface, local_mac);
+#elif GOOS_netbsd
+	execute_command(1, "ifconfig %s link %s", tun_iface, local_mac);
 #else
 	execute_command(1, "ifconfig %s ether %s", tun_iface, local_mac);
 #endif
 
+	// Setting up a static ip for the interface
 	char local_ipv4[sizeof(LOCAL_IPV4)];
 	snprintf_check(local_ipv4, sizeof(local_ipv4), LOCAL_IPV4, tun_id);
 	execute_command(1, "ifconfig %s inet %s netmask 255.255.255.0", tun_iface, local_ipv4);
 
+	// Creates an ARP table entry for the remote ip and MAC address
 	char remote_mac[sizeof(REMOTE_MAC)];
 	char remote_ipv4[sizeof(REMOTE_IPV4)];
 	snprintf_check(remote_mac, sizeof(remote_mac), REMOTE_MAC);
 	snprintf_check(remote_ipv4, sizeof(remote_ipv4), REMOTE_IPV4, tun_id);
 	execute_command(0, "arp -s %s %s", remote_ipv4, remote_mac);
 
+	// Set up a static ipv6 address for the interface
 	char local_ipv6[sizeof(LOCAL_IPV6)];
 	snprintf_check(local_ipv6, sizeof(local_ipv6), LOCAL_IPV6, tun_id);
 	execute_command(1, "ifconfig %s inet6 %s", tun_iface, local_ipv6);
 
+	// Registers an NDP entry for the remote MAC with the remote ipv6 address
 	char remote_ipv6[sizeof(REMOTE_IPV6)];
 	snprintf_check(remote_ipv6, sizeof(remote_ipv6), REMOTE_IPV6, tun_id);
 	execute_command(0, "ndp -s %s%%%s %s", remote_ipv6, tun_iface, remote_mac);
@@ -332,7 +348,7 @@ static void loop();
 static int do_sandbox_none(void)
 {
 	sandbox_common();
-#if (GOOS_freebsd || GOOS_openbsd) && (SYZ_EXECUTOR || SYZ_TUN_ENABLE)
+#if (GOOS_freebsd || GOOS_openbsd || GOOS_netbsd) && (SYZ_EXECUTOR || SYZ_TUN_ENABLE)
 	initialize_tun(procid);
 #endif
 	loop();
@@ -367,7 +383,7 @@ static int do_sandbox_setuid(void)
 		return wait_for_loop(pid);
 
 	sandbox_common();
-#if (GOOS_freebsd || GOOS_openbsd) && (SYZ_EXECUTOR || SYZ_TUN_ENABLE)
+#if (GOOS_freebsd || GOOS_openbsd || GOOS_netbsd) && (SYZ_EXECUTOR || SYZ_TUN_ENABLE)
 	initialize_tun(procid);
 #endif
 
diff --git a/executor/defs.h b/executor/defs.h
index fe7d12e32..aa5a64c95 100644
--- a/executor/defs.h
+++ b/executor/defs.h
@@ -125,7 +125,7 @@
 
 #if GOARCH_amd64
 #define GOARCH "amd64"
-#define SYZ_REVISION "71ea2d6047354a28057976d7ea40a5f24673a27c"
+#define SYZ_REVISION "65d5b75dae9655ed21ef93383407c6108cf4de62"
 #define SYZ_EXECUTOR_USES_FORK_SERVER 1
 #define SYZ_EXECUTOR_USES_SHMEM 1
 #define SYZ_PAGE_SIZE 4096
diff --git a/executor/syscalls.h b/executor/syscalls.h
index 3665c8897..fb6b5f64f 100644
--- a/executor/syscalls.h
+++ b/executor/syscalls.h
@@ -15804,7 +15804,10 @@ const call_t syscalls[] = {
     {"symlink", 57},
     {"symlinkat", 470},
     {"sync", 36},
+    {"syz_emit_ethernet", 0, (syscall_t)syz_emit_ethernet},
     {"syz_execute_func", 0, (syscall_t)syz_execute_func},
+    {"syz_extract_tcp_res", 0, (syscall_t)syz_extract_tcp_res},
+    {"syz_extract_tcp_res$synack", 0, (syscall_t)syz_extract_tcp_res},
     {"truncate", 200},
     {"unlink", 10},
     {"unlinkat", 471},