Introduced following options:
attr-l4-redirect-table (type integer)
attr-l4-redirect-ipset (type string)
Please note, to enable L4 redirect attr-l4-redirect must be specified and sent

If authentication rejects session, but l4-redirect-on-reject is specified in config then
temporary session will be created and l4 redirect rule will be applied to IP of that session.
Session will be terminated after specified number of seconds.
Also if l4-redirect-ip-pool option is specified then IP will be allocated from that special pool.

If authentication rejects session, but l4-redirect-on-reject is specified in config then
temporary session will be created and l4 redirect rule will be applied to IP of that session.
Session will be terminated after specified number of seconds.
Also if l4-redirect-ip-pool option is specified then IP will be allocated from that special pool.

This patch gets rid of synchronuos style of authentication/accounting.
Synchronous style of authentication/accounting produced sleeping threads
which becomes a problem when lots of sessions started/stopped and all they want authorization/accounting.

To enable this specify attr-opt82 option in [ipoe] section.
Attribute must be octet type.

ipoe: introduced attr-dhcp-lease-time option to specify radius attribute to pass dhcp lease time (attribute must be integer)

Previous version used linear list of vlan monitor enabled interfaces,
this caused huge overhead in packet receive path because for each
received packet it performed search on linear list to check if vlan monitor
is enabled on input device.
Current version binds internal structure to net_device->ml_priv so search is not performed more.

Before this time accel-ppp always worked in "ip unnumbered" mode.
This option may turn this mode off (default is on)

After introduction offer-delay accel-ppp stopped to answer NAK for REQUESTs if requested session is not existing
to give chance other servers to reply. But this causes that some broken clients enter to infinite REQUEST loop.
This patch corrects this issue, so if offer-delay is not configured (means that this is only server in the net) or
after receiving few REQUESTs accel-ppp send NAK for non-existing sessions.

Wait for previous session completely terminated before continuing authorization new session.

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

ipoe: early allocate interface for shared vlans (prevents different values of NAS-Port in Access-Request and Account-Request)
Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

This new option is pattern for naming newly created vlans.
Pattern may contain following macros:
%I - name of parent interface
%N - number of vlan
By default vlan-name=%I.%N
Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Signed-off-by: NDmitry Kozlov <xeb@mail.ru>

Introduce per-ctrl 'ip-pool' option to be used as default IP pool name which may be overrided by radius
Signed-off-by: NDmitry Kozlov <xeb@mail.ru>