Openwrt/package/network/config/vxlan/files/vxlan.sh
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

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#!/bin/sh
[ -n "$INCLUDE_ONLY" ] || {
. /lib/functions.sh
. /lib/functions/network.sh
. ../netifd-proto.sh
init_proto "$@"
}
proto_vxlan_setup_peer() {
type bridge &> /dev/null || {
proto_notify_error "$cfg" "MISSING_BRIDGE_COMMAND"
exit
}
local peer_config="$1"
local vxlan
local lladdr
local dst
local src_vni
local vni
local port
local via
config_get vxlan "${peer_config}" "vxlan"
config_get lladdr "${peer_config}" "lladdr"
config_get dst "${peer_config}" "dst"
config_get src_vni "${peer_config}" "src_vni"
config_get vni "${peer_config}" "vni"
config_get port "${peer_config}" "port"
config_get via "${peer_config}" "via"
[ "$cfg" = "$vxlan" ] || {
# This peer section belongs to another device
return
}
[ -n "${dst}" ] || {
proto_notify_error "$cfg" "MISSING_PEER_ADDRESS"
exit
}
bridge fdb append \
${lladdr:-00:00:00:00:00:00} \
dev ${cfg} \
dst ${dst} \
${src_vni:+src_vni $src_vni} \
${vni:+vni $vni} \
${port:+port $port} \
${via:+via $via}
}
vxlan_generic_setup() {
local cfg="$1"
local mode="$2"
local local="$3"
local remote="$4"
local link="$cfg"
local port vid ttl tos mtu macaddr zone rxcsum txcsum srcportmin srcportmax ageing maxaddress learning rsc proxy l2miss l3miss gbp
json_get_vars port vid ttl tos mtu macaddr zone rxcsum txcsum srcportmin srcportmax ageing maxaddress learning rsc proxy l2miss l3miss gbp
proto_init_update "$link" 1
proto_add_tunnel
json_add_string mode "$mode"
[ -n "$tunlink" ] && json_add_string link "$tunlink"
[ -n "$local" ] && json_add_string local "$local"
[ -n "$remote" ] && json_add_string remote "$remote"
[ -n "$ttl" ] && json_add_int ttl "$ttl"
[ -n "$tos" ] && json_add_string tos "$tos"
[ -n "$mtu" ] && json_add_int mtu "$mtu"
json_add_object 'data'
[ -n "$port" ] && json_add_int port "$port"
[ -n "$vid" ] && json_add_int id "$vid"
[ -n "$srcportmin" ] && json_add_int srcportmin "$srcportmin"
[ -n "$srcportmax" ] && json_add_int srcportmax "$srcportmax"
[ -n "$ageing" ] && json_add_int ageing "$ageing"
[ -n "$maxaddress" ] && json_add_int maxaddress "$maxaddress"
[ -n "$macaddr" ] && json_add_string macaddr "$macaddr"
[ -n "$rxcsum" ] && json_add_boolean rxcsum "$rxcsum"
[ -n "$txcsum" ] && json_add_boolean txcsum "$txcsum"
[ -n "$learning" ] && json_add_boolean learning "$learning"
[ -n "$rsc" ] && json_add_boolean rsc "$rsc"
[ -n "$proxy" ] && json_add_boolean proxy "$proxy"
[ -n "$l2miss" ] && json_add_boolean l2miss "$l2miss"
[ -n "$l3miss" ] && json_add_boolean l3miss "$l3miss"
[ -n "$gbp" ] && json_add_boolean gbp "$gbp"
json_close_object
proto_close_tunnel
proto_add_data
[ -n "$zone" ] && json_add_string zone "$zone"
proto_close_data
proto_send_update "$cfg"
config_load network
config_foreach proto_vxlan_setup_peer "vxlan_peer"
}
proto_vxlan_setup() {
local cfg="$1"
local ipaddr peeraddr
json_get_vars ipaddr peeraddr tunlink
( proto_add_host_dependency "$cfg" '' "$tunlink" )
case "$ipaddr" in
"auto"|"")
ipaddr="0.0.0.0"
;;
esac
vxlan_generic_setup "$cfg" 'vxlan' "$ipaddr" "$peeraddr"
}
proto_vxlan6_setup() {
local cfg="$1"
local ip6addr peer6addr
json_get_vars ip6addr peer6addr tunlink
( proto_add_host_dependency "$cfg" '' "$tunlink" )
case "$ip6addr" in
"auto"|"")
# ensure tunnel via ipv6
ip6addr="::"
;;
esac
vxlan_generic_setup "$cfg" 'vxlan6' "$ip6addr" "$peer6addr"
}
proto_vxlan_teardown() {
local cfg="$1"
}
proto_vxlan6_teardown() {
local cfg="$1"
}
vxlan_generic_init_config() {
no_device=1
available=1
proto_config_add_string "tunlink"
proto_config_add_string "zone"
proto_config_add_int "vid"
proto_config_add_int "port"
proto_config_add_int "ttl"
proto_config_add_int "tos"
proto_config_add_int "mtu"
proto_config_add_int "srcportmin"
proto_config_add_int "srcportmax"
proto_config_add_int "ageing"
proto_config_add_int "maxaddress"
proto_config_add_boolean "rxcsum"
proto_config_add_boolean "txcsum"
proto_config_add_boolean "learning"
proto_config_add_boolean "rsc"
proto_config_add_boolean "proxy"
proto_config_add_boolean "l2miss"
proto_config_add_boolean "l3miss"
proto_config_add_boolean "gbp"
proto_config_add_string "macaddr"
}
proto_vxlan_init_config() {
vxlan_generic_init_config
proto_config_add_string "ipaddr"
proto_config_add_string "peeraddr"
}
proto_vxlan6_init_config() {
vxlan_generic_init_config
proto_config_add_string "ip6addr"
proto_config_add_string "peer6addr"
}
[ -n "$INCLUDE_ONLY" ] || {
add_protocol vxlan
add_protocol vxlan6
}