add static route definitions

natesales · Mar 20, 2021 · ff9d2fb · ff9d2fb
1 parent bb904fb
commit ff9d2fb
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Showing 3 changed files with 57 additions and 18 deletions.
diff --git a/README.md b/README.md
@@ -126,6 +126,7 @@ bcg can build [keepalived](https://github.com/acassen/keepalived) configs for VR
 | asn       | ASN of this router                                                                                            |
 | router-id | Router ID of this router                                                                                      |
 | prefixes  | List of prefixes to originate                                                                                 |
+| statics   | Map of static route to nexthop                                                                                |
 | irrdb     | IRRDB to query prefix sets from (default is rr.ntt.net which includes generated route objects from RPKI ROAs) |
 | rtr-server | IP address or hostname of RPKI RTR server (default is 127.0.0.1)                                             |
 | keep-filtered | Should BIRD keep filtered routes                                                                          |

diff --git a/internal/config/main.go b/internal/config/main.go
@@ -74,24 +74,27 @@ type VRRPInstance struct {
 
 // Config contains global configuration about this router and BCG instance
 type Config struct {
-	Asn            uint             `yaml:"asn" toml:"ASN" json:"asn"`
-	RouterId       string           `yaml:"router-id" toml:"Router-ID" json:"router-id"`
-	Prefixes       []string         `yaml:"prefixes" toml:"Prefixes" json:"prefixes"`
-	Peers          map[string]*Peer `yaml:"peers" toml:"Peers" json:"peers"`
-	VRRPInstances  []*VRRPInstance  `yaml:"vrrp" toml:"VRRP" json:"vrrp"`
-	IrrDb          string           `yaml:"irrdb" toml:"IRRDB" json:"irrdb"`
-	RtrServer      string           `yaml:"rtr-server" toml:"RTR-Server" json:"rtr-server"`
-	RtrPort        int              `yaml:"rtr-port" toml:"RTR-Port" json:"rtr-port"`
-	KeepFiltered   bool             `yaml:"keep-filtered" toml:"KeepFiltered" json:"keep-filtered"`
-	MergePaths     bool             `yaml:"merge-paths" toml:"MergePaths" json:"merge-paths"`
-	PrefSrc4       string           `yaml:"pref-src4" toml:"PrefSrc4" json:"PrefSrc4"`
-	PrefSrc6       string           `yaml:"pref-src6" toml:"PrefSrc6" json:"PrefSrc6"`
-	FilterDefault  bool             `yaml:"filter-default" toml:"FilterDefault" json:"filter-default"`
-	DefaultEnabled bool             `yaml:"enable-default" toml:"EnableDefault" json:"enable-default"`
-
-	OriginSet4 []string `yaml:"-" toml:"-" json:"-"`
-	OriginSet6 []string `yaml:"-" toml:"-" json:"-"`
-	Hostname   string   `yaml:"-" toml:"-" json:"-"`
+	Asn            uint              `yaml:"asn" toml:"ASN" json:"asn"`
+	RouterId       string            `yaml:"router-id" toml:"Router-ID" json:"router-id"`
+	Prefixes       []string          `yaml:"prefixes" toml:"Prefixes" json:"prefixes"`
+	Statics        map[string]string `yaml:"statics" toml:"Statics" json:"statics"`
+	Peers          map[string]*Peer  `yaml:"peers" toml:"Peers" json:"peers"`
+	VRRPInstances  []*VRRPInstance   `yaml:"vrrp" toml:"VRRP" json:"vrrp"`
+	IrrDb          string            `yaml:"irrdb" toml:"IRRDB" json:"irrdb"`
+	RtrServer      string            `yaml:"rtr-server" toml:"RTR-Server" json:"rtr-server"`
+	RtrPort        int               `yaml:"rtr-port" toml:"RTR-Port" json:"rtr-port"`
+	KeepFiltered   bool              `yaml:"keep-filtered" toml:"KeepFiltered" json:"keep-filtered"`
+	MergePaths     bool              `yaml:"merge-paths" toml:"MergePaths" json:"merge-paths"`
+	PrefSrc4       string            `yaml:"pref-src4" toml:"PrefSrc4" json:"PrefSrc4"`
+	PrefSrc6       string            `yaml:"pref-src6" toml:"PrefSrc6" json:"PrefSrc6"`
+	FilterDefault  bool              `yaml:"filter-default" toml:"FilterDefault" json:"filter-default"`
+	DefaultEnabled bool              `yaml:"enable-default" toml:"EnableDefault" json:"enable-default"`
+
+	OriginSet4 []string          `yaml:"-" toml:"-" json:"-"`
+	OriginSet6 []string          `yaml:"-" toml:"-" json:"-"`
+	Static4    map[string]string `yaml:"-" toml:"-" json:"-"`
+	Static6    map[string]string `yaml:"-" toml:"-" json:"-"`
+	Hostname   string            `yaml:"-" toml:"-" json:"-"`
 }
 
 // Wrapper stores a Peer and Config passed to the template
@@ -195,6 +198,35 @@ func Load(filename string) (*Config, error) {
 		setPeerDefaults(name, peer)
 	}
 
+	// Parse static routes
+	for prefix, nexthop := range config.Statics {
+		// Initialize static maps
+		config.Static4 = map[string]string{}
+		config.Static6 = map[string]string{}
+
+		pfx, _, err := net.ParseCIDR(prefix)
+		if err != nil {
+			return nil, errorx.Decorate(err, "Invalid static prefix: "+prefix)
+		}
+		if net.ParseIP(nexthop) == nil {
+			return nil, errorx.Decorate(err, "Invalid static next hop: "+nexthop)
+		}
+
+		if pfx.To4() == nil { // If IPv6
+			config.Static6[prefix] = nexthop
+		} else { // If IPv4
+			config.Static4[prefix] = nexthop
+		}
+
+		// Print static routes
+		if len(config.Static4) > 0 {
+			log.Infof("IPv4 statics: %+v", config.Static4)
+		}
+		if len(config.Static6) > 0 {
+			log.Infof("IPv6 statics: %+v", config.Static6)
+		}
+	}
+
 	// Parse VRRP configs
 	for _, vrrpInstance := range config.VRRPInstances {
 		// Sort VIPs by address family

diff --git a/templates/global.tmpl b/templates/global.tmpl
@@ -14,6 +14,9 @@ protocol static static4 {
   {{- range $i, $prefix := .OriginSet4 }}
   route {{ $prefix }} reject;
   {{- end }}
+  {{- range $prefix, $nexthop := .Static4 }}
+  route {{ $prefix }} via {{ $nexthop }};
+  {{- end }}
 }
 {{- end }}
 
@@ -27,6 +30,9 @@ protocol static static6 {
   {{- range $i, $prefix := .OriginSet6 }}
   route {{ $prefix }} reject;
   {{- end }}
+  {{- range $prefix, $nexthop := .Static6 }}
+  route {{ $prefix }} via {{ $nexthop }};
+  {{- end }}
 }
 {{- end }}