# Generated by confd
include "bird_aggr.cfg";
include "bird_ipam.cfg";
{{`{{$node_ip_key := printf "/host/%s/ip_addr_v4" (getenv "NODENAME")}}{{$node_ip := getv $node_ip_key}}`}}

# ensure we only listen to a specific ip and address
listen bgp address {{`{{$node_ip}}`}} port {{.Values.networking.bgp.ipv4.port.listen}};

{{`{{$router_id := getenv "CALICO_ROUTER_ID" ""}}`}}
{{`router id {{if ne "" ($router_id)}}{{$router_id}}{{else}}{{$node_ip}}{{end}};`}}

{{`{{define "LOGGING"}}`}}
{{`{{$node_logging_key := printf "/host/%s/loglevel" (getenv "NODENAME")}}{{if exists $node_logging_key}}{{$logging := getv $node_logging_key}}`}}
{{`{{if eq $logging "debug"}}  debug all;{{else if ne $logging "none"}}  debug { states };{{end}}`}}
{{`{{else if exists "/global/loglevel"}}{{$logging := getv "/global/loglevel"}}`}}
{{`{{if eq $logging "debug"}}  debug all;{{else if ne $logging "none"}}  debug { states };{{end}}`}}
{{`{{else}}  debug { states };{{end}}`}}
{{`{{end}}`}}

# Configure synchronization between routing tables and kernel.
protocol kernel {
  learn;             # Learn all alien routes from the kernel
  persist;           # Don't remove routes on bird shutdown
  scan time 2;       # Scan kernel routing table every 2 seconds
  import all;
  export filter calico_ipip; # Default is export none
  graceful restart;  # Turn on graceful restart to reduce potential flaps in
                     # routes when reloading BIRD configuration.  With a full
                     # automatic mesh, there is no way to prevent BGP from
                     # flapping since multiple nodes update their BGP
                     # configuration at the same time, GR is not guaranteed to
                     # work correctly in this scenario.
}

# Watch interface up/down events.
protocol device {
{{`  {{template "LOGGING"}}`}}
  scan time 2;    # Scan interfaces every 2 seconds
}

protocol direct {
{{`  {{template "LOGGING"}}`}}
  interface -"cali*", "*"; # Exclude cali* but include everything else.
}

{{`{{if eq "" ($node_ip)}}# IPv4 disabled on this node.`}}
{{`{{else}}{{$node_as_key := printf "/host/%s/as_num" (getenv "NODENAME")}}`}}
# Template for all BGP clients
template bgp bgp_template {
{{`  {{template "LOGGING"}}`}}
  description "Connection to BGP peer";
{{`  local as {{if exists $node_as_key}}{{getv $node_as_key}}{{else}}{{getv "/global/as_num"}}{{end}};`}}
  multihop;
  gateway recursive; # This should be the default, but just in case.
  import all;        # Import all routes, since we don't know what the upstream
                     # topology is and therefore have to trust the ToR/RR.
  export filter calico_pools;  # Only want to export routes for workloads.
  next hop self;     # Disable next hop processing and always advertise our
                     # local address as nexthop
{{`  source address {{$node_ip}};  # The local address we use for the TCP connection`}}
  add paths on;
  graceful restart;  # See comment in kernel section about graceful restart.
}

# ------------- Node-to-node mesh -------------
{{`{{if (json (getv "/global/node_mesh")).enabled}}`}}
{{`{{range $host := lsdir "/host"}}`}}
{{`{{$onode_as_key := printf "/host/%s/as_num" .}}`}}
{{`{{$onode_ip_key := printf "/host/%s/ip_addr_v4" .}}{{if exists $onode_ip_key}}{{$onode_ip := getv $onode_ip_key}}`}}
{{`{{$nums := split $onode_ip "."}}{{$id := join $nums "_"}}`}}
{{`# For peer {{$onode_ip_key}}`}}
{{`{{if eq $onode_ip ($node_ip) }}# Skipping ourselves ({{$node_ip}})`}}
{{`{{else if ne "" $onode_ip}}protocol bgp Mesh_{{$id}} from bgp_template {`}}
{{`  neighbor {{$onode_ip}} as {{if exists $onode_as_key}}{{getv $onode_as_key}}{{else}}{{getv "/global/as_num"}}{{end}};`}}
  neighbor port {{.Values.networking.bgp.ipv4.port.neighbor}};
{{`}{{end}}{{end}}{{end}}`}}
{{`{{else}}`}}
# Node-to-node mesh disabled
{{`{{end}}`}}


# ------------- Global peers -------------
{{`{{if ls "/global/peer_v4"}}`}}
{{`{{range gets "/global/peer_v4/*"}}{{$data := json .Value}}`}}
{{`{{$nums := split $data.ip "."}}{{$id := join $nums "_"}}`}}
{{`# For peer {{.Key}}`}}
{{`protocol bgp Global_{{$id}} from bgp_template {`}}
{{`  neighbor {{$data.ip}} as {{$data.as_num}};`}}
  neighbor port {{.Values.networking.bgp.ipv4.port.neighbor}};
}
{{`{{end}}`}}
{{`{{else}}# No global peers configured.{{end}}`}}


# ------------- Node-specific peers -------------
{{`{{$node_peers_key := printf "/host/%s/peer_v4" (getenv "NODENAME")}}`}}
{{`{{if ls $node_peers_key}}`}}
{{`{{range gets (printf "%s/*" $node_peers_key)}}{{$data := json .Value}}`}}
{{`{{$nums := split $data.ip "."}}{{$id := join $nums "_"}}`}}
{{`# For peer {{.Key}}`}}
{{`protocol bgp Node_{{$id}} from bgp_template {`}}
{{`  neighbor {{$data.ip}} as {{$data.as_num}};`}}
  neighbor port {{.Values.networking.bgp.ipv4.port.neighbor}};
}
{{`{{end}}`}}
{{`{{else}}# No node-specific peers configured.{{end}}`}}
{{`{{end}}{{/* End of IPv4 enable check */}}`}}