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Merge pull request #1390 from jonathonf/linux-tap-link-ordering

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Set MAC address before bringing up Linux TAP link
This commit is contained in:
Grant Limberg 2021-04-28 13:17:38 -07:00 committed by GitHub
commit c69d2df0a2
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1 changed files with 13 additions and 13 deletions
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26
osdep/LinuxEthernetTap.cpp
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@ -208,12 +208,6 @@ LinuxEthernetTap::LinuxEthernetTap(
return;
}
// Some kernel versions seem to require you to yield while the device comes up
// before they will accept MTU and MAC. For others it doesn't matter, but is
// harmless. This was moved to the worker thread though so as not to block the
// main ZeroTier loop.
usleep(500000);
ifr.ifr_ifru.ifru_hwaddr.sa_family = ARPHRD_ETHER;
_mac.copyTo(ifr.ifr_ifru.ifru_hwaddr.sa_data,6);
if (ioctl(sock,SIOCSIFHWADDR,(void *)&ifr) < 0) {
@ -222,13 +216,6 @@ LinuxEthernetTap::LinuxEthernetTap(
return;
}
ifr.ifr_ifru.ifru_mtu = (int)_mtu;
if (ioctl(sock,SIOCSIFMTU,(void *)&ifr) < 0) {
::close(sock);
printf("WARNING: ioctl() failed setting up Linux tap device (set MTU)\n");
return;
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(sock,SIOCSIFFLAGS,(void *)&ifr) < 0) {
::close(sock);
@ -236,6 +223,19 @@ LinuxEthernetTap::LinuxEthernetTap(
return;
}
// Some kernel versions seem to require you to yield while the device comes up
// before they will accept MTU and MAC. For others it doesn't matter, but is
// harmless. This was moved to the worker thread though so as not to block the
// main ZeroTier loop.
usleep(500000);
ifr.ifr_ifru.ifru_mtu = (int)_mtu;
if (ioctl(sock,SIOCSIFMTU,(void *)&ifr) < 0) {
::close(sock);
printf("WARNING: ioctl() failed setting up Linux tap device (set MTU)\n");
return;
}
fcntl(_fd,F_SETFL,O_NONBLOCK);
::close(sock);