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authorRusty Russell <rusty@rustcorp.com.au>2008-08-12 18:52:51 -0400
committerRusty Russell <rusty@rustcorp.com.au>2008-08-12 03:52:52 -0400
commit40c42076ebd362dc69210cccea101ac80b6d4bd4 (patch)
tree01336076f45eb008f00940a5df86b5970b8d92d0 /Documentation/lguest/lguest.c
parent10fec20ef5eec1c91913baec1225400f0d02df40 (diff)
lguest: don't set MAC address for guest unless specified
This shows up when trying to bridge: tap0: received packet with own address as source address As Max Krasnyansky points out, there's no reason to give the guest the same mac address as the TUN device. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Max Krasnyansky <maxk@qualcomm.com>
Diffstat (limited to 'Documentation/lguest/lguest.c')
-rw-r--r--Documentation/lguest/lguest.c23
1 files changed, 1 insertions, 22 deletions
diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index b88b0ea54e90..655414821edc 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -1447,21 +1447,6 @@ static void configure_device(int fd, const char *tapif, u32 ipaddr)
1447 err(1, "Bringing interface %s up", tapif); 1447 err(1, "Bringing interface %s up", tapif);
1448} 1448}
1449 1449
1450static void get_mac(int fd, const char *tapif, unsigned char hwaddr[6])
1451{
1452 struct ifreq ifr;
1453
1454 memset(&ifr, 0, sizeof(ifr));
1455 strcpy(ifr.ifr_name, tapif);
1456
1457 /* SIOC stands for Socket I/O Control. G means Get (vs S for Set
1458 * above). IF means Interface, and HWADDR is hardware address.
1459 * Simple! */
1460 if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0)
1461 err(1, "getting hw address for %s", tapif);
1462 memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, 6);
1463}
1464
1465static int get_tun_device(char tapif[IFNAMSIZ]) 1450static int get_tun_device(char tapif[IFNAMSIZ])
1466{ 1451{
1467 struct ifreq ifr; 1452 struct ifreq ifr;
@@ -1531,11 +1516,8 @@ static void setup_tun_net(char *arg)
1531 p = strchr(arg, ':'); 1516 p = strchr(arg, ':');
1532 if (p) { 1517 if (p) {
1533 str2mac(p+1, conf.mac); 1518 str2mac(p+1, conf.mac);
1519 add_feature(dev, VIRTIO_NET_F_MAC);
1534 *p = '\0'; 1520 *p = '\0';
1535 } else {
1536 p = arg + strlen(arg);
1537 /* None supplied; query the randomly assigned mac. */
1538 get_mac(ipfd, tapif, conf.mac);
1539 } 1521 }
1540 1522
1541 /* arg is now either an IP address or a bridge name */ 1523 /* arg is now either an IP address or a bridge name */
@@ -1547,13 +1529,10 @@ static void setup_tun_net(char *arg)
1547 /* Set up the tun device. */ 1529 /* Set up the tun device. */
1548 configure_device(ipfd, tapif, ip); 1530 configure_device(ipfd, tapif, ip);
1549 1531
1550 /* Tell Guest what MAC address to use. */
1551 add_feature(dev, VIRTIO_NET_F_MAC);
1552 add_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY); 1532 add_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY);
1553 /* Expect Guest to handle everything except UFO */ 1533 /* Expect Guest to handle everything except UFO */
1554 add_feature(dev, VIRTIO_NET_F_CSUM); 1534 add_feature(dev, VIRTIO_NET_F_CSUM);
1555 add_feature(dev, VIRTIO_NET_F_GUEST_CSUM); 1535 add_feature(dev, VIRTIO_NET_F_GUEST_CSUM);
1556 add_feature(dev, VIRTIO_NET_F_MAC);
1557 add_feature(dev, VIRTIO_NET_F_GUEST_TSO4); 1536 add_feature(dev, VIRTIO_NET_F_GUEST_TSO4);
1558 add_feature(dev, VIRTIO_NET_F_GUEST_TSO6); 1537 add_feature(dev, VIRTIO_NET_F_GUEST_TSO6);
1559 add_feature(dev, VIRTIO_NET_F_GUEST_ECN); 1538 add_feature(dev, VIRTIO_NET_F_GUEST_ECN);