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authorMohsin KAZMI <sykazmi@cisco.com>2016-07-18 16:57:40 +0200
committerChris Luke <chris_luke@comcast.com>2016-07-19 13:23:32 +0000
commit90d8e2c4c3bc3a12dab88320040c1718a1aafcfd (patch)
tree6bd0e37aaa242094a1d4a8f3eb224124e5b60325
parent98cfc1aab07d311b53b0171fad62a4031c96fcfd (diff)
Tap: Fix hardware address assignment
[VPP-200]: Previously, VPP set the same hardware address to tap interface as of Linux side tap interface, if neither hardware address nor 'random' keyword were given explicitly on VPP command line during tap creation or modification, which was default case. This patch makes sure to set the different hardware addresses randomly as default case. While one can set unique hardware address or similar to one at Linux side using VPP tap command line. Change-Id: Ie0a82f3706834e87426d66c6e869ec4edfefe932 Signed-off-by: Mohsin KAZMI <sykazmi@cisco.com>
-rw-r--r--vnet/vnet/unix/tapcli.c41
1 files changed, 17 insertions, 24 deletions
diff --git a/vnet/vnet/unix/tapcli.c b/vnet/vnet/unix/tapcli.c
index bb280db9..c1548fd1 100644
--- a/vnet/vnet/unix/tapcli.c
+++ b/vnet/vnet/unix/tapcli.c
@@ -756,24 +756,28 @@ int vnet_tap_connect (vlib_main_t * vm, u8 * intfc_name, u8 *hwaddr_arg,
goto error;
}
- if (ioctl (dev_tap_fd, SIOCGIFHWADDR, &ifr) < 0)
- {
- rv = VNET_API_ERROR_SYSCALL_ERROR_1;
- goto error;
- }
-
ti = tapcli_get_new_tapif();
ti->per_interface_next_index = ~0;
if (hwaddr_arg != 0)
clib_memcpy(hwaddr, hwaddr_arg, 6);
+ else
+ {
+ f64 now = vlib_time_now(vm);
+ u32 rnd;
+ rnd = (u32) (now * 1e6);
+ rnd = random_u32 (&rnd);
+
+ memcpy (hwaddr+2, &rnd, sizeof(rnd));
+ hwaddr[0] = 2;
+ hwaddr[1] = 0xfe;
+ }
error = ethernet_register_interface
(tm->vnet_main,
tapcli_dev_class.index,
ti - tm->tapcli_interfaces /* device instance */,
- hwaddr_arg != 0 ? hwaddr :
- (u8 *) ifr.ifr_hwaddr.sa_data /* ethernet address */,
+ hwaddr /* ethernet address */,
&ti->hw_if_index,
tapcli_flag_change);
@@ -995,7 +999,7 @@ tap_modify_command_fn (vlib_main_t * vm,
VLIB_CLI_COMMAND (tap_modify_command, static) = {
.path = "tap modify",
- .short_help = "tap modify <vpp-tap-intfc-name> <linux-intfc-name> [hwaddr [<addr> | random]]",
+ .short_help = "tap modify <vpp-tap-intfc-name> <linux-intfc-name> [hwaddr <addr>]",
.function = tap_modify_command_fn,
};
@@ -1006,7 +1010,6 @@ tap_connect_command_fn (vlib_main_t * vm,
{
u8 * intfc_name;
tapcli_main_t * tm = &tapcli_main;
- int user_hwaddr = 0;
u8 hwaddr[6];
u8 *hwaddr_arg = 0;
u32 sw_if_index;
@@ -1024,21 +1027,11 @@ tap_connect_command_fn (vlib_main_t * vm,
if (unformat(input, "hwaddr %U", unformat_ethernet_address,
&hwaddr))
- user_hwaddr = 1;
+ hwaddr_arg = hwaddr;
+ /* It is here for backward compatibility */
if (unformat(input, "hwaddr random"))
- {
- f64 now = vlib_time_now(vm);
- u32 rnd;
- rnd = (u32) (now * 1e6);
- rnd = random_u32 (&rnd);
-
- clib_memcpy (hwaddr+2, &rnd, sizeof(rnd));
- hwaddr[0] = 2;
- hwaddr[1] = 0xfe;
- user_hwaddr = 1;
- }
- if (user_hwaddr) hwaddr_arg = hwaddr;
+ ;
int rv = vnet_tap_connect(vm, intfc_name, hwaddr_arg, &sw_if_index);
if (rv) {
@@ -1095,7 +1088,7 @@ tap_connect_command_fn (vlib_main_t * vm,
VLIB_CLI_COMMAND (tap_connect_command, static) = {
.path = "tap connect",
- .short_help = "tap connect <intfc-name> [hwaddr [<addr> | random]]",
+ .short_help = "tap connect <intfc-name> [hwaddr <addr>]",
.function = tap_connect_command_fn,
};