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Put TUN down on client disconnect.

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On startup client creates TUN interface in UP state and kept it UP even
if connection to the server was lost. Creating interface in DOWN state,
turning it UP on successful (re-)connection to server and DOWN on either
disconnect or connection loss would enable DHCP client (say dhclient5)
to detect necessity for lease renewal.

Added a client configuration parameter to create TUN interface in DOWN
state and commands to enable, disable, and query the configuration
parameter.
Enabling the parameter causes client to put all unused TUN interfaces
DOWN, create new TUN interfaces in DOWN state, and turn TUN interfaces
corresponding to active sessions DOWN on connection loss or
disconnecting from server.
Disabling the parameter forces client to turn all TUN interfaces UP and
create new TUN interfaces in UP state.
Default value is 'Disable'.
This commit is contained in:
Joshua Perry
2018-08-05 17:35:57 +02:00
committed by Davide Beatrici
parent 828d3b2ffb
commit 59e1483dbf
16 changed files with 436 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

108
src/Cedar/VLanUnix.c
View File

@ -360,7 +360,7 @@ void FreeVLan(VLAN *v)
}
// Create a tap
VLAN *NewTap(char *name, char *mac_address)
VLAN *NewTap(char *name, char *mac_address, bool create_up)
{
int fd;
VLAN *v;
@ -370,7 +370,7 @@ VLAN *NewTap(char *name, char *mac_address)
return NULL;
}
fd = UnixCreateTapDeviceEx(name, "tap", mac_address);
fd = UnixCreateTapDeviceEx(name, "tap", mac_address, create_up);
if (fd == -1)
{
return NULL;
@ -423,13 +423,25 @@ VLAN *NewVLan(char *instance_name, VLAN_PARAM *param)
return v;
}
// Generate TUN interface name
void GenerateTunName(char *name, char *prefix, char *tun_name, size_t tun_name_len)
{
char instance_name_lower[MAX_SIZE];
// Generate the device name
StrCpy(instance_name_lower, sizeof(instance_name_lower), name);
Trim(instance_name_lower);
StrLower(instance_name_lower);
Format(tun_name, tun_name_len, "%s_%s", prefix, instance_name_lower);
tun_name[15] = 0;
}
// Create a tap device
int UnixCreateTapDeviceEx(char *name, char *prefix, UCHAR *mac_address)
int UnixCreateTapDeviceEx(char *name, char *prefix, UCHAR *mac_address, bool create_up)
{
int fd;
struct ifreq ifr;
char eth_name[MAX_SIZE];
char instance_name_lower[MAX_SIZE];
struct sockaddr sa;
char *tap_name = TAP_FILENAME_1;
int s;
@ -442,13 +454,7 @@ int UnixCreateTapDeviceEx(char *name, char *prefix, UCHAR *mac_address)
return -1;
}
// Generate the device name
StrCpy(instance_name_lower, sizeof(instance_name_lower), name);
Trim(instance_name_lower);
StrLower(instance_name_lower);
Format(eth_name, sizeof(eth_name), "%s_%s", prefix, instance_name_lower);
eth_name[15] = 0;
GenerateTunName(name, prefix, eth_name, sizeof(eth_name));
// Open the tun / tap
#ifndef UNIX_MACOS
@ -531,8 +537,11 @@ int UnixCreateTapDeviceEx(char *name, char *prefix, UCHAR *mac_address)
StrCpy(ifr.ifr_name, sizeof(ifr.ifr_name), eth_name);
ioctl(s, SIOCGIFFLAGS, &ifr);
ifr.ifr_flags |= IFF_UP;
ioctl(s, SIOCSIFFLAGS, &ifr);
if (create_up)
{
ifr.ifr_flags |= IFF_UP;
ioctl(s, SIOCSIFFLAGS, &ifr);
}
close(s);
}
@ -560,8 +569,11 @@ int UnixCreateTapDeviceEx(char *name, char *prefix, UCHAR *mac_address)
StrCpy(ifr.ifr_name, sizeof(ifr.ifr_name), macos_eth_name);
ioctl(s, SIOCGIFFLAGS, &ifr);
ifr.ifr_flags |= IFF_UP;
ioctl(s, SIOCSIFFLAGS, &ifr);
if (create_up)
{
ifr.ifr_flags |= IFF_UP;
ioctl(s, SIOCSIFFLAGS, &ifr);
}
close(s);
}
@ -637,9 +649,9 @@ int UnixCreateTapDeviceEx(char *name, char *prefix, UCHAR *mac_address)
return fd;
}
int UnixCreateTapDevice(char *name, UCHAR *mac_address)
int UnixCreateTapDevice(char *name, UCHAR *mac_address, bool create_up)
{
return UnixCreateTapDeviceEx(name, "vpn", mac_address);
return UnixCreateTapDeviceEx(name, "vpn", mac_address, create_up);
}
// Close the tap device
@ -696,7 +708,7 @@ void UnixVLanInit()
}
// Create a VLAN
bool UnixVLanCreateEx(char *name, char *prefix, UCHAR *mac_address)
bool UnixVLanCreateEx(char *name, char *prefix, UCHAR *mac_address, bool create_up)
{
// Validate arguments
char tmp[MAX_SIZE];
@ -727,7 +739,7 @@ bool UnixVLanCreateEx(char *name, char *prefix, UCHAR *mac_address)
}
// Create a tap device
fd = UnixCreateTapDeviceEx(name, prefix, mac_address);
fd = UnixCreateTapDeviceEx(name, prefix, mac_address, create_up);
if (fd == -1)
{
// Failure to create
@ -745,9 +757,63 @@ bool UnixVLanCreateEx(char *name, char *prefix, UCHAR *mac_address)
return true;
}
bool UnixVLanCreate(char *name, UCHAR *mac_address)
bool UnixVLanCreate(char *name, UCHAR *mac_address, bool create_up)
{
return UnixVLanCreateEx(name, "vpn", mac_address);
return UnixVLanCreateEx(name, "vpn", mac_address, create_up);
}
// Set a VLAN up/down
bool UnixVLanSetState(char* name, bool state_up)
{
#ifdef UNIX_LINUX
UNIX_VLAN_LIST *t, tt;
struct ifreq ifr;
int s;
char eth_name[MAX_SIZE];
LockList(unix_vlan);
{
int result;
// Find a device with the same name
Zero(&tt, sizeof(tt));
StrCpy(tt.Name, sizeof(tt.Name), name);
t = Search(unix_vlan, &tt);
if (t == NULL)
{
// No such device
UnlockList(unix_vlan);
return false;
}
GenerateTunName(name, "vpn", eth_name, sizeof(eth_name));
Zero(&ifr, sizeof(ifr));
StrCpy(ifr.ifr_name, sizeof(ifr.ifr_name), eth_name);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s == -1)
{
// Failed to create socket
UnlockList(unix_vlan);
return false;
}
ioctl(s, SIOCGIFFLAGS, &ifr);
if (state_up)
{
ifr.ifr_flags |= IFF_UP;
}
else
{
ifr.ifr_flags &= ~IFF_UP;
}
result = ioctl(s, SIOCSIFFLAGS, &ifr);
close(s);
}
UnlockList(unix_vlan);
#endif // UNIX_LINUX
return true;
}
// Enumerate VLANs