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Cedar/VLanUnix: Make NicDelete work on FreeBSD

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In contrast to Linux, FreeBSD's tap devices are still plumbed after fd
closed. The tap device must be destroyed in addition to closing fd
to delete virtual network interfaces used for VPN connection.

NicDelete command now works properly and virtual network interfaces used
by vpnclient are cleaned up when shutting down vpnclient.
This commit is contained in:
Koichiro IWAO 2023-05-31 11:34:50 +09:00
parent 9c33605f5e
commit 8482a52522
1 changed files with 34 additions and 0 deletions
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34
src/Cedar/VLanUnix.c
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@ -569,12 +569,40 @@ void UnixCloseTapDevice(int fd)
close(fd);
}
// Destroy the tap device (for FreeBSD)
// FreeBSD tap device is still plumbed after closing fd so need to destroy after close
void UnixDestroyTapDevice(char *name)
{
#ifdef UNIX_BSD
struct ifreq ifr;
char eth_name[MAX_SIZE];
int s;
Zero(&ifr, sizeof(ifr));
GenerateTunName(name, UNIX_VLAN_IFACE_PREFIX, eth_name, sizeof(eth_name));
StrCpy(ifr.ifr_name, sizeof(ifr.ifr_name), eth_name);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s == -1)
{
return;
}
ioctl(s, SIOCIFDESTROY, &ifr);
close(s);
#endif // UNIX_BSD
}
#else // NO_VLAN
void UnixCloseTapDevice(int fd)
{
}
void UnixDestroyTapDevice(char *name)
{
}
int UnixCreateTapDeviceEx(char *name, char *prefix, UCHAR *mac_address, bool create_up)
{
return -1;
@ -769,6 +797,9 @@ void UnixVLanDelete(char *name)
if (t != NULL)
{
UnixCloseTapDevice(t->fd);
#ifdef UNIX_BSD
UnixDestroyTapDevice(t->Name);
#endif
Delete(unix_vlan, t);
Free(t);
}
@ -815,6 +846,9 @@ void UnixVLanFree()
UNIX_VLAN_LIST *t = LIST_DATA(unix_vlan, i);
UnixCloseTapDevice(t->fd);
#ifdef UNIX_BSD
UnixDestroyTapDevice(t->Name);
#endif
Free(t);
}