Commit Graph

8 Commits

Author SHA1 Message Date
Johannes Kimmel
3f5619f259 vxlan: allow for dynamic source ip selection (FS#3426)
By setting 'auto', the zero address or the empty string as source
address (option ipaddr, option ip6addr), vxlan will choose one
dynamically. This helps in setups where a wan ip or prefix changes.

This corresponse to setting up an vxlan tunnel with:

proto vxlan6:
    # ip link add vx0 type vxlan id ID local :: ...
proto vxlan:
    # ip link add vx0 type vxlan id ID local 0.0.0.0 ...

While it is possible to not specify a source ip at all, the kernel will
default to setting up a ipv4 tunnel. The kernel will take any hint from
source and peer ips to figure out, what tunnel type to use. To make sure
we setup an ipv6 tunnel for proto vxlan6, this workaround is needed.

This will not change the behaviour of currently working configurations.
However this will allow former broken configurations, namely those not
specifying both a source address and tunnel interface, to setup a
tunnel interface. Previously those configurations weren't reporting an
error and were stueck in a setup loop like in Bug FS#3426.

This change lifts the currently very strict behaviour and should fix the
following bug:

Fixes: FS#3426
Ref: https://bugs.openwrt.org/index.php?do=details&task_id=3426

Signed-off-by: Johannes Kimmel <fff@bareminimum.eu>
2020-12-31 11:53:21 +01:00
Hans Dedecker
ad3044c424 vxlan: fix rsc config option
Fix route short circuit config option; fixes commit 036221ce5a

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
2020-09-24 22:14:36 +02:00
Hans Dedecker
036221ce5a vxlan: add extra config options
Add config options:
  srcportmin/srcportmax : range of port numbers to use as  UDP source ports
                          to communicate to the remote VXLAN tunnel endpoint
  ageing                : lifetime in seconds of FDB entries learnt by the kernel
  maxaddress            : maximum number of FDB entries
  learning              : enable/disable entering unknown source link layer addresses
                          and IP addresses into the VXLAN device FDB.
  rsc                   : enable/disable route short circuit
  proxy                 : enable/disable ARP proxy
  l2miss                : enable/disable netlink LLADDR miss notifications
  l3miss                : enable/disable netlink IP ADDR miss notifications
  gbp                   : enable/disable the Group Policy extension

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
2020-09-23 21:45:15 +02:00
Johannes Kimmel
65e9de3c33 vxlan: add capability for multiple fdb entries
Similar to wireguard, vxlan can configure multiple peers or add specific
entries to the fdb for a single mac address.

While you can still use peeraddr/peer6addr option within the proto
vxlan/vxlan6 section to not break existing configurations, this patch
allows to add multiple sections that conigure fdb entries via the bridge
command. As such, the bridge command is now a dependency of the vxlan
package. (To be honest without the bridge command available, vxlan isn't
very much fun to use or debug at all)

Field names are taken direclty from the bridge command.

Example with all supported parameters, since this hasn't been documented so
far:

  config interface 'vx0'
      option proto     'vxlan6'      # use vxlan over ipv6

      # main options
      option ip6addr   '2001:db8::1' # listen address
      option tunlink   'wan6'        # optional if listen address given
      option peer6addr '2001:db8::2' # now optional
      option port      '8472'        # this is the standard port under linux
      option vid       '42'          # VXLAN Network Identifier to use
      option mtu       '1430'        # vxlan6 has 70 bytes overhead

      # extra options
      option rxcsum  '0'  # allow receiving packets without checksum
      option txcsum  '0'  # send packets without checksum
      option ttl     '16' # specifies the TTL value for outgoing packets
      option tos     '0'  # specifies the TOS value for outgoing packets
      option macaddr '11:22:33:44:55:66' # optional, manually specify mac
                                         # default is a random address

Single peer with head-end replication. Corresponds to the following call
to bridge:

  $ bridge fdb append 00:00:00:00:00:00 dev vx0 dst 2001:db8::3

  config vxlan_peer
      option vxlan 'vx0'
      option dst '2001:db8::3' # always required

For multiple peers, this section can be repeated for each dst address.

It's possible to specify a multicast address as destination. Useful when
multicast routing is available or within one lan segment:

  config vxlan_peer
      option vxlan 'vx0'
      option dst 'ff02::1337' # multicast group to join.
                              # all bum traffic will be send there
      option via 'eth1'       # for multicast, an outgoing interface needs
                              # to be specified

All available peer options for completeness:

  config vxlan_peer
      option vxlan   'vx0'               # the interface to configure
      option lladdr  'aa:bb:cc:dd:ee:ff' # specific mac,
      option dst     '2001:db8::4'       # connected to this peer
      option via     'eth0.1'            # use this interface only
      option port    '4789'              # use different port for this peer
      option vni     '23'                # override vni for this peer
      option src_vni '123'               # see man 3 bridge

Signed-off-by: Johannes Kimmel <fff@bareminimum.eu>
2020-07-20 13:43:36 +02:00
Johannes Kimmel
5222aadbf3 vxlan: remove mandatory peeraddr
vxlan can be configured without a peer address. This is used to prepare
an interface and add peers later.

Fixes: FS#2743

Signed-off-by: Johannes Kimmel <fff@bareminimum.eu>
Acked-by: Matthias Schiffer <mschiffer@universe-factory.net>
2020-07-20 13:43:36 +02:00
Johannes Kimmel
0453c3866f vxlan: fix udp checksum control
So far, passing "rxcsum" and "txcsum" had no effect.

Fixes: 95ab18e012 ("vxlan: add options to enable and disable UDP
checksums")

Signed-off-by: Johannes Kimmel <fff@bareminimum.eu>
[add Fixes:]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
2020-07-15 00:23:38 +02:00
Matthias Schiffer
95ab18e012
vxlan: add options to enable and disable UDP checksums
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
2018-01-24 13:53:34 +01:00
Matthias Schiffer
452f5446b8
vxlan: add new package for netifd VXLAN proto
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
2017-03-10 01:23:50 +01:00