From: Wei Liu <wei.liu2@citrix.com>
Date: Fri, 31 Jul 2015 10:08:58 +0000 (+0100)
Subject: use ioctl etc
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=6fb05bc59f9e4d52e4b217f55e3b2697f4885e3c;p=people%2Fliuw%2Fqemu-rump-config.git

use ioctl etc
---

diff --git a/qemu-rump-config.c b/qemu-rump-config.c
index 6598ba7..4a79ccf 100644
--- a/qemu-rump-config.c
+++ b/qemu-rump-config.c
@@ -1,5 +1,3 @@
-/* This program brings up rump kernel to a static network topology. */
-
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
@@ -16,25 +14,76 @@
 #include <fcntl.h>
 #include <assert.h>
 
-#define NOFAIL_RV(a) do{int rv=a;if(rv){printf("%s:%d",#a,rv);abort();}}while(0)
+/* Create and bring up interface */
+void new_interface(const char *name)
+{
+	int s, rc;
+	struct ifreq ifr;
 
-int main(int argc, char **argv)
+	s = socket(AF_INET, SOCK_DGRAM, 0);
+	if (s == -1)
+		err(1, "socket");
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	rc = ioctl(s, SIOCIFCREATE, &ifr);
+	if (rc < 0)
+		err(1, "SIOCIFCREATE");
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	rc = ioctl(s, SIOCGIFFLAGS, &ifr);
+	if (rc < 0)
+		err(1, "SIOCGIFFLAGS");
+	ifr.ifr_flags |= IFF_UP;
+	rc = ioctl(s, SIOCSIFFLAGS, &ifr);
+	if (rc < 0)
+		err(1, "SIOCSIFFLAGS");
+	rc = ioctl(s, SIOCGIFFLAGS, &ifr);
+	if (rc < 0)
+		err(1, "SIOCGIFFLAGS");
+	if (!(ifr.ifr_flags & IFF_UP))
+		err(1, "%s is not up", name);
+
+	close(s);
+}
+
+void add_to_bridge(const char *bridge, const char *interface)
 {
+	int s, rc;
+	struct ifbreq ifbr;
+	struct ifdrv ifd;
+
+	s = socket(AF_INET, SOCK_DGRAM, 0);
+	if (s == -1)
+		err(1, "socket");
 
-	NOFAIL_RV(rump_pub_netconfig_ifcreate("tap0"));
-	NOFAIL_RV(rump_pub_netconfig_ifup("tap0"));
+	memset(&ifbr, 0, sizeof(ifbr));
+	strlcpy(ifbr.ifbr_ifsname, interface, sizeof(ifbr.ifbr_ifsname));
+	memset(&ifd, 0, sizeof(ifd));
+	strlcpy(ifd.ifd_name, bridge, sizeof(ifd.ifd_name));
+	ifd.ifd_cmd = BRDGADD;
+	ifd.ifd_len = sizeof(ifbr);
+	ifd.ifd_data = &ifbr;
+	rc = ioctl(s, SIOCSDRVSPEC, &ifd);
+	if (rc < 0)
+		err(1, "SIOCSDRVSPEC");
 
-	NOFAIL_RV(rump_pub_netconfig_ifcreate("tap1"));
-	NOFAIL_RV(rump_pub_netconfig_ifup("tap1"));
+	close(s);
+}
 
-	NOFAIL_RV(rump_pub_netconfig_ifcreate("tap2"));
-	NOFAIL_RV(rump_pub_netconfig_ifup("tap2"));
+int main(int argc, char **argv)
+{
+	new_interface("tap0");
+	new_interface("tap1");
+	new_interface("tap2");
+	new_interface("bridge0");
 
-	NOFAIL_RV(rump_pub_netconfig_ifcreate("bridge0"));
-	NOFAIL_RV(rump_pub_netconfig_bradd("bridge0", "tap0"));
-	NOFAIL_RV(rump_pub_netconfig_bradd("bridge0", "xenif0"));
-	NOFAIL_RV(rump_pub_netconfig_ifup("bridge0"));
+	add_to_bridge("bridge0", "tap0");
+	add_to_bridge("bridge0", "tap1");
+	add_to_bridge("bridge0", "tap2");
 
+	sleep(1000000);
 	return 0;
 }