Merge pull request 'Agent: translate blrules/conntrack/secmarks/vars' (#8) from benvin/agent-longtail-global2 into main

Reviewed-on: #8

internal/agent/agent.go

@@ -90,6 +90,12 @@ func (a *Agent) applyConfig(ctx context.Context, rc *RenderedConfig, report bool
 		if err := a.Client.ReportStatus(ctx, rc.Generation); err != nil {
 			slog.Warn("agent: reporting status failed", "err", err)
 		}
+		// Report the FIB so the control plane can scope router enforcement.
+		if fib := CollectFIB(ctx); len(fib) > 0 {
+			if err := a.Client.ReportRoutes(ctx, fib); err != nil {
+				slog.Warn("agent: reporting routes failed", "err", err)
+			}
+		}
 	}
 	return nil
 }

internal/agent/agent_test.go

@@ -84,6 +84,41 @@ func TestTranslateBareZone(t *testing.T) {
 	}
 }
 
+func TestTranslateNATTier(t *testing.T) {
+	prob := 0.5
+	rc := &RenderedConfig{
+		Enforcing: true,
+		SNAT: []RenderedSNAT{
+			{Action: "masquerade", Source: []string{"10.1.0.0/24"}, Egress: []string{"eth0", "eth3"}},
+			{Action: "snat", Source: []string{"10.2.0.0/24"}, Egress: []string{"eth0"}, Address: "203.0.113.1", Probability: &prob},
+		},
+		Netmap: []RenderedNetmap{{Type: "dnat", FromNet: "10.0.0.0/24", ToNet: "192.168.1.0/24", Interface: "eth0"}},
+		NAT:    []RenderedNAT{{External: "203.0.113.10", Internal: "10.1.0.10", Interface: "eth0"}},
+	}
+	cfg, err := Translate(rc)
+	if err != nil {
+		t.Fatalf("Translate: %v", err)
+	}
+
+	// masquerade with two egress interfaces expands to two rules; snat adds one.
+	if len(cfg.SNAT) != 3 {
+		t.Fatalf("expected 3 SNAT rules, got %d: %+v", len(cfg.SNAT), cfg.SNAT)
+	}
+	if cfg.SNAT[0].Action != config.SNATMasquerade || cfg.SNAT[0].Source != "10.1.0.0/24" || cfg.SNAT[0].Dest != "eth0" {
+		t.Errorf("unexpected masquerade rule: %+v", cfg.SNAT[0])
+	}
+	if cfg.SNAT[2].Address != "203.0.113.1" || cfg.SNAT[2].Probability != 0.5 {
+		t.Errorf("snat address/probability not carried: %+v", cfg.SNAT[2])
+	}
+
+	if len(cfg.Netmap) != 1 || cfg.Netmap[0].Net1 != "10.0.0.0/24" || cfg.Netmap[0].Net2 != "192.168.1.0/24" || cfg.Netmap[0].Interface != "eth0" {
+		t.Errorf("netmap not translated: %+v", cfg.Netmap)
+	}
+	if len(cfg.StaticNAT) != 1 || cfg.StaticNAT[0].External != "203.0.113.10" || cfg.StaticNAT[0].Internal != "10.1.0.10" {
+		t.Errorf("static nat not translated: %+v", cfg.StaticNAT)
+	}
+}
+
 func TestTranslateRejectsUnknownAction(t *testing.T) {
 	rc := &RenderedConfig{Enforcing: true, Rules: []RenderedRule{{Action: "bogus"}}}
 	if _, err := Translate(rc); err == nil {

internal/agent/client.go

@@ -70,6 +70,30 @@ func ParseRendered(body []byte) (*RenderedConfig, error) {
 	return &cfg, nil
 }
 
+// ReportRoutes reports the device's reachable prefixes (FIB) so the control
+// plane can scope which routers enforce a rule.
+func (c *Client) ReportRoutes(ctx context.Context, prefixes []string) error {
+	url := fmt.Sprintf("%s/api/v1/devices/%s/routes", c.BaseURL, c.Device)
+	payload, _ := json.Marshal(map[string][]string{"prefixes": prefixes})
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(payload))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Authorization", "Bearer "+c.Token)
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := c.HTTP.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	io.Copy(io.Discard, io.LimitReader(resp.Body, 1<<16))
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("report routes: %d", resp.StatusCode)
+	}
+	return nil
+}
+
 // ReportStatus tells the control plane which generation this device has applied.
 func (c *Client) ReportStatus(ctx context.Context, generation int64) error {
 	url := fmt.Sprintf("%s/api/v1/devices/%s/status", c.BaseURL, c.Device)

internal/agent/fib.go

@@ -0,0 +1,76 @@
+package agent
+
+import (
+	"context"
+	"os/exec"
+	"strings"
+)
+
+// CollectFIB returns the device's reachable prefixes from the kernel FIB — which
+// includes FRR-installed routes — by shelling out to `ip route`. The control
+// plane uses these to scope which routers enforce a rule. On a host without
+// iproute2 it returns nil, and the control plane falls back to over-approximation.
+func CollectFIB(ctx context.Context) []string {
+	var prefixes []string
+	for _, spec := range []struct {
+		args []string
+		def  string
+	}{
+		{[]string{"route", "show"}, "0.0.0.0/0"},
+		{[]string{"-6", "route", "show"}, "::/0"},
+	} {
+		out, err := exec.CommandContext(ctx, "ip", spec.args...).Output()
+		if err != nil {
+			continue
+		}
+		prefixes = append(prefixes, parseRoutes(string(out), spec.def)...)
+	}
+	return dedup(prefixes)
+}
+
+// routeTypeKeywords are leading tokens in `ip route` output that precede the
+// actual destination (e.g. "unreachable 10.0.0.0/8").
+var routeTypeKeywords = map[string]bool{
+	"unreachable": true, "blackhole": true, "prohibit": true, "throw": true,
+	"local": true, "broadcast": true, "multicast": true, "anycast": true, "nat": true,
+}
+
+// parseRoutes extracts destination prefixes from `ip route show` output.
+// defaultPrefix is substituted for a "default" route (family-specific).
+func parseRoutes(output, defaultPrefix string) []string {
+	var out []string
+	for _, line := range strings.Split(output, "\n") {
+		fields := strings.Fields(line)
+		if len(fields) == 0 {
+			continue
+		}
+		dst := fields[0]
+		// ECMP routes emit continuation "nexthop ..." lines with no destination.
+		if dst == "nexthop" {
+			continue
+		}
+		if routeTypeKeywords[dst] {
+			if len(fields) < 2 {
+				continue
+			}
+			dst = fields[1]
+		}
+		if dst == "default" {
+			out = append(out, defaultPrefix)
+			continue
+		}
+		out = append(out, normalizePrefix(dst))
+	}
+	return out
+}
+
+// normalizePrefix turns a bare host address into a host prefix (/32 or /128).
+func normalizePrefix(dst string) string {
+	if strings.Contains(dst, "/") {
+		return dst
+	}
+	if strings.Contains(dst, ":") {
+		return dst + "/128"
+	}
+	return dst + "/32"
+}

internal/agent/fib_test.go

@@ -0,0 +1,55 @@
+package agent
+
+import (
+	"reflect"
+	"sort"
+	"testing"
+)
+
+func TestParseRoutesV4(t *testing.T) {
+	// Representative `ip route show` output, including a default route, an ECMP
+	// route with nexthop continuation lines, a connected route, and a host route.
+	out := `default via 10.0.0.1 dev eth0 proto dhcp
+10.1.0.0/24 dev eth1 proto kernel scope link src 10.1.0.5
+10.4.0.0/24 proto bgp metric 20
+	nexthop via 10.0.0.2 dev eth0 weight 1
+	nexthop via 10.0.0.3 dev eth0 weight 1
+192.0.2.7 dev eth2 scope link
+blackhole 172.16.0.0/12
+`
+	got := parseRoutes(out, "0.0.0.0/0")
+	sort.Strings(got)
+	want := []string{"0.0.0.0/0", "10.1.0.0/24", "10.4.0.0/24", "172.16.0.0/12", "192.0.2.7/32"}
+	sort.Strings(want)
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("parseRoutes v4 = %v, want %v", got, want)
+	}
+}
+
+func TestParseRoutesV6(t *testing.T) {
+	out := `default via fe80::1 dev eth0 metric 1024
+2001:db8:1::/64 dev eth1 proto kernel metric 256
+2001:db8:4::5 dev eth2
+`
+	got := parseRoutes(out, "::/0")
+	sort.Strings(got)
+	want := []string{"2001:db8:1::/64", "2001:db8:4::5/128", "::/0"}
+	sort.Strings(want)
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("parseRoutes v6 = %v, want %v", got, want)
+	}
+}
+
+func TestNormalizePrefix(t *testing.T) {
+	cases := map[string]string{
+		"10.1.0.0/24":   "10.1.0.0/24",
+		"10.1.0.5":      "10.1.0.5/32",
+		"2001:db8::1":   "2001:db8::1/128",
+		"2001:db8::/32": "2001:db8::/32",
+	}
+	for in, want := range cases {
+		if got := normalizePrefix(in); got != want {
+			t.Errorf("normalizePrefix(%q) = %q, want %q", in, got, want)
+		}
+	}
+}

internal/agent/rendered.go

@@ -8,16 +8,266 @@ package agent
 // GET /api/v1/devices/{name}/config. It mirrors the control plane's compiler
 // output: interface-agnostic, address-matched rules plus named sets.
 type RenderedConfig struct {
-	Generation int64               `yaml:"generation" json:"generation"`
-	Device     string              `yaml:"device" json:"device"`
-	Class      string              `yaml:"class" json:"class"`
-	Enforcing  bool                `yaml:"enforcing" json:"enforcing"`
-	Settings   RenderedSettings    `yaml:"settings" json:"settings"`
-	Resolver   []string            `yaml:"resolver,omitempty" json:"resolver,omitempty"`
-	Bindings   map[string][]string `yaml:"bindings,omitempty" json:"bindings,omitempty"` // zone -> interfaces
-	Sets       []RenderedSet       `yaml:"sets,omitempty" json:"sets,omitempty"`
-	Rules      []RenderedRule      `yaml:"rules,omitempty" json:"rules,omitempty"`
-	Policies   []RenderedPolicy    `yaml:"policies,omitempty" json:"policies,omitempty"`
+	Generation   int64                 `yaml:"generation" json:"generation"`
+	Device       string                `yaml:"device" json:"device"`
+	Class        string                `yaml:"class" json:"class"`
+	Enforcing    bool                  `yaml:"enforcing" json:"enforcing"`
+	Settings     RenderedSettings      `yaml:"settings" json:"settings"`
+	Resolver     []string              `yaml:"resolver,omitempty" json:"resolver,omitempty"`
+	Bindings     map[string][]string   `yaml:"bindings,omitempty" json:"bindings,omitempty"` // zone -> interfaces
+	Sets         []RenderedSet         `yaml:"sets,omitempty" json:"sets,omitempty"`
+	Rules        []RenderedRule        `yaml:"rules,omitempty" json:"rules,omitempty"`
+	Policies     []RenderedPolicy      `yaml:"policies,omitempty" json:"policies,omitempty"`
+	SNAT         []RenderedSNAT        `yaml:"snat,omitempty" json:"snat,omitempty"`
+	Netmap       []RenderedNetmap      `yaml:"netmap,omitempty" json:"netmap,omitempty"`
+	NAT          []RenderedNAT         `yaml:"nat,omitempty" json:"nat,omitempty"`
+	Hosts        []RenderedHost        `yaml:"hosts,omitempty" json:"hosts,omitempty"`
+	Providers    []RenderedProvider    `yaml:"providers,omitempty" json:"providers,omitempty"`
+	Routes       []RenderedRoute       `yaml:"routes,omitempty" json:"routes,omitempty"`
+	RoutingRules []RenderedRoutingRule `yaml:"routing_rules,omitempty" json:"routing_rules,omitempty"`
+	Tunnels      []RenderedTunnel      `yaml:"tunnels,omitempty" json:"tunnels,omitempty"`
+	StoppedRules []RenderedStoppedRule `yaml:"stopped_rules,omitempty" json:"stopped_rules,omitempty"`
+	ProxyARP     []RenderedProxy       `yaml:"proxy_arp,omitempty" json:"proxy_arp,omitempty"`
+	ProxyNDP     []RenderedProxy       `yaml:"proxy_ndp,omitempty" json:"proxy_ndp,omitempty"`
+	ArpRules     []RenderedArpRule     `yaml:"arp_rules,omitempty" json:"arp_rules,omitempty"`
+	Maclist      []RenderedMaclist     `yaml:"maclist,omitempty" json:"maclist,omitempty"`
+	Mangle       []RenderedMangle      `yaml:"mangle,omitempty" json:"mangle,omitempty"`
+	Accounting   []RenderedAccounting  `yaml:"accounting,omitempty" json:"accounting,omitempty"`
+	TCDevices    []RenderedTCDevice    `yaml:"tc_devices,omitempty" json:"tc_devices,omitempty"`
+	TCClasses    []RenderedTCClass     `yaml:"tc_classes,omitempty" json:"tc_classes,omitempty"`
+	TCFilters    []RenderedTCFilter    `yaml:"tc_filters,omitempty" json:"tc_filters,omitempty"`
+	TCInterfaces []RenderedTCInterface `yaml:"tc_interfaces,omitempty" json:"tc_interfaces,omitempty"`
+	TCPriorities []RenderedTCPriority  `yaml:"tc_priorities,omitempty" json:"tc_priorities,omitempty"`
+	Blrules      []RenderedBlrule      `yaml:"blrules,omitempty" json:"blrules,omitempty"`
+	Conntrack    []RenderedConntrack   `yaml:"conntrack,omitempty" json:"conntrack,omitempty"`
+	Secmarks     []RenderedSecmark     `yaml:"secmarks,omitempty" json:"secmarks,omitempty"`
+	Vars         map[string]string     `yaml:"vars,omitempty" json:"vars,omitempty"`
+}
+
+type RenderedBlrule struct {
+	Priority int      `yaml:"priority,omitempty" json:"priority,omitempty"`
+	Action   string   `yaml:"action" json:"action"`
+	Source   string   `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest     string   `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Proto    string   `yaml:"proto,omitempty" json:"proto,omitempty"`
+	DPort    []string `yaml:"dport,omitempty" json:"dport,omitempty"`
+	SPort    []string `yaml:"sport,omitempty" json:"sport,omitempty"`
+	Log      string   `yaml:"log,omitempty" json:"log,omitempty"`
+	Comment  string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedConntrack struct {
+	Action  string   `yaml:"action" json:"action"`
+	Source  string   `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest    string   `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Proto   string   `yaml:"proto,omitempty" json:"proto,omitempty"`
+	DPort   []string `yaml:"dport,omitempty" json:"dport,omitempty"`
+	SPort   []string `yaml:"sport,omitempty" json:"sport,omitempty"`
+	Chain   string   `yaml:"chain,omitempty" json:"chain,omitempty"`
+	Helper  string   `yaml:"helper,omitempty" json:"helper,omitempty"`
+	User    string   `yaml:"user,omitempty" json:"user,omitempty"`
+	Comment string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedSecmark struct {
+	Secmark string   `yaml:"secmark" json:"secmark"`
+	Chain   string   `yaml:"chain" json:"chain"`
+	Source  string   `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest    string   `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Proto   string   `yaml:"proto,omitempty" json:"proto,omitempty"`
+	DPort   []string `yaml:"dport,omitempty" json:"dport,omitempty"`
+	SPort   []string `yaml:"sport,omitempty" json:"sport,omitempty"`
+	Comment string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedMangle struct {
+	Action      string   `yaml:"action" json:"action"`
+	Chain       string   `yaml:"chain,omitempty" json:"chain,omitempty"`
+	MarkValue   string   `yaml:"mark_value,omitempty" json:"mark_value,omitempty"`
+	Source      string   `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest        string   `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Proto       string   `yaml:"proto,omitempty" json:"proto,omitempty"`
+	DPort       []string `yaml:"dport,omitempty" json:"dport,omitempty"`
+	SPort       []string `yaml:"sport,omitempty" json:"sport,omitempty"`
+	User        string   `yaml:"user,omitempty" json:"user,omitempty"`
+	Mark        string   `yaml:"mark,omitempty" json:"mark,omitempty"`
+	Length      string   `yaml:"length,omitempty" json:"length,omitempty"`
+	TOS         string   `yaml:"tos,omitempty" json:"tos,omitempty"`
+	Helper      string   `yaml:"helper,omitempty" json:"helper,omitempty"`
+	Probability *float64 `yaml:"probability,omitempty" json:"probability,omitempty"`
+	Comment     string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedAccounting struct {
+	Action  string   `yaml:"action" json:"action"`
+	Section string   `yaml:"section,omitempty" json:"section,omitempty"`
+	Chain   string   `yaml:"chain,omitempty" json:"chain,omitempty"`
+	Source  string   `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest    string   `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Proto   string   `yaml:"proto,omitempty" json:"proto,omitempty"`
+	DPort   []string `yaml:"dport,omitempty" json:"dport,omitempty"`
+	SPort   []string `yaml:"sport,omitempty" json:"sport,omitempty"`
+	Mark    string   `yaml:"mark,omitempty" json:"mark,omitempty"`
+	Comment string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedTCDevice struct {
+	Interface    string `yaml:"interface" json:"interface"`
+	InBandwidth  string `yaml:"in_bandwidth,omitempty" json:"in_bandwidth,omitempty"`
+	OutBandwidth string `yaml:"out_bandwidth,omitempty" json:"out_bandwidth,omitempty"`
+	Comment      string `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedTCClass struct {
+	Interface string `yaml:"interface" json:"interface"`
+	Mark      int    `yaml:"mark,omitempty" json:"mark,omitempty"`
+	Rate      string `yaml:"rate,omitempty" json:"rate,omitempty"`
+	Ceil      string `yaml:"ceil,omitempty" json:"ceil,omitempty"`
+	Priority  int    `yaml:"priority,omitempty" json:"priority,omitempty"`
+	Comment   string `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedTCFilter struct {
+	Class    string   `yaml:"class" json:"class"`
+	Source   string   `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest     string   `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Proto    string   `yaml:"proto,omitempty" json:"proto,omitempty"`
+	DPort    []string `yaml:"dport,omitempty" json:"dport,omitempty"`
+	SPort    []string `yaml:"sport,omitempty" json:"sport,omitempty"`
+	TOS      string   `yaml:"tos,omitempty" json:"tos,omitempty"`
+	Length   int      `yaml:"length,omitempty" json:"length,omitempty"`
+	Priority int      `yaml:"priority,omitempty" json:"priority,omitempty"`
+	Comment  string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedTCInterface struct {
+	Interface    string `yaml:"interface" json:"interface"`
+	Type         string `yaml:"type,omitempty" json:"type,omitempty"`
+	InBandwidth  string `yaml:"in_bandwidth,omitempty" json:"in_bandwidth,omitempty"`
+	OutBandwidth string `yaml:"out_bandwidth,omitempty" json:"out_bandwidth,omitempty"`
+	Comment      string `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedTCPriority struct {
+	Band      int      `yaml:"band" json:"band"`
+	Proto     string   `yaml:"proto,omitempty" json:"proto,omitempty"`
+	DPort     []string `yaml:"dport,omitempty" json:"dport,omitempty"`
+	SPort     []string `yaml:"sport,omitempty" json:"sport,omitempty"`
+	Address   string   `yaml:"address,omitempty" json:"address,omitempty"`
+	Interface string   `yaml:"interface,omitempty" json:"interface,omitempty"`
+	Helper    string   `yaml:"helper,omitempty" json:"helper,omitempty"`
+	Comment   string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedTunnel struct {
+	Type         string   `yaml:"type" json:"type"`
+	Zone         string   `yaml:"zone" json:"zone"`
+	Gateways     []string `yaml:"gateways,omitempty" json:"gateways,omitempty"`
+	GatewayZones []string `yaml:"gateway_zones,omitempty" json:"gateway_zones,omitempty"`
+	Port         int      `yaml:"port,omitempty" json:"port,omitempty"`
+	Comment      string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedStoppedRule struct {
+	Action  string   `yaml:"action" json:"action"`
+	Source  string   `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest    string   `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Proto   string   `yaml:"proto,omitempty" json:"proto,omitempty"`
+	DPort   []string `yaml:"dport,omitempty" json:"dport,omitempty"`
+	SPort   []string `yaml:"sport,omitempty" json:"sport,omitempty"`
+	Comment string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedProxy struct {
+	Address    string `yaml:"address" json:"address"`
+	Interface  string `yaml:"interface,omitempty" json:"interface,omitempty"`
+	External   string `yaml:"external" json:"external"`
+	HaveRoute  bool   `yaml:"haveroute,omitempty" json:"haveroute,omitempty"`
+	Persistent bool   `yaml:"persistent,omitempty" json:"persistent,omitempty"`
+	Comment    string `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedArpRule struct {
+	Action        string `yaml:"action" json:"action"`
+	ActionAddress string `yaml:"action_address,omitempty" json:"action_address,omitempty"`
+	ActionMAC     string `yaml:"action_mac,omitempty" json:"action_mac,omitempty"`
+	Source        string `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest          string `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Opcode        int    `yaml:"opcode,omitempty" json:"opcode,omitempty"`
+	Comment       string `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedMaclist struct {
+	Action    string   `yaml:"action" json:"action"`
+	Interface string   `yaml:"interface" json:"interface"`
+	MAC       string   `yaml:"mac,omitempty" json:"mac,omitempty"`
+	Addresses []string `yaml:"addresses,omitempty" json:"addresses,omitempty"`
+	Log       string   `yaml:"log,omitempty" json:"log,omitempty"`
+	Comment   string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedHost struct {
+	Zone       string   `yaml:"zone" json:"zone"`
+	Interface  string   `yaml:"interface" json:"interface"`
+	Addresses  []string `yaml:"addresses,omitempty" json:"addresses,omitempty"`
+	Exclusions []string `yaml:"exclusions,omitempty" json:"exclusions,omitempty"`
+	Dynamic    bool     `yaml:"dynamic,omitempty" json:"dynamic,omitempty"`
+}
+
+type RenderedProvider struct {
+	Name      string   `yaml:"name" json:"name"`
+	Number    int      `yaml:"number" json:"number"`
+	Mark      int      `yaml:"mark,omitempty" json:"mark,omitempty"`
+	Duplicate string   `yaml:"duplicate,omitempty" json:"duplicate,omitempty"`
+	Interface string   `yaml:"interface" json:"interface"`
+	Gateway   string   `yaml:"gateway,omitempty" json:"gateway,omitempty"`
+	Copy      []string `yaml:"copy,omitempty" json:"copy,omitempty"`
+}
+
+type RenderedRoute struct {
+	Provider   string `yaml:"provider,omitempty" json:"provider,omitempty"`
+	Dest       string `yaml:"dest" json:"dest"`
+	Gateway    string `yaml:"gateway,omitempty" json:"gateway,omitempty"`
+	Oif        string `yaml:"oif,omitempty" json:"oif,omitempty"`
+	Persistent bool   `yaml:"persistent,omitempty" json:"persistent,omitempty"`
+	Comment    string `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+type RenderedRoutingRule struct {
+	Source     string `yaml:"source,omitempty" json:"source,omitempty"`
+	Dest       string `yaml:"dest,omitempty" json:"dest,omitempty"`
+	Provider   string `yaml:"provider" json:"provider"`
+	Priority   int    `yaml:"priority,omitempty" json:"priority,omitempty"`
+	Persistent bool   `yaml:"persistent,omitempty" json:"persistent,omitempty"`
+	Mark       string `yaml:"mark,omitempty" json:"mark,omitempty"`
+	Comment    string `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+// RenderedSNAT is a resolved SNAT/masquerade rule (egress carries interface names).
+type RenderedSNAT struct {
+	Action      string   `yaml:"action" json:"action"`
+	Source      []string `yaml:"source,omitempty" json:"source,omitempty"`
+	Egress      []string `yaml:"egress" json:"egress"`
+	Address     string   `yaml:"address,omitempty" json:"address,omitempty"`
+	Probability *float64 `yaml:"probability,omitempty" json:"probability,omitempty"`
+	Comment     string   `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+// RenderedNetmap is a resolved network-to-network mapping on one interface.
+type RenderedNetmap struct {
+	Type      string `yaml:"type" json:"type"`
+	FromNet   string `yaml:"from_net" json:"from_net"`
+	ToNet     string `yaml:"to_net" json:"to_net"`
+	Interface string `yaml:"interface,omitempty" json:"interface,omitempty"`
+	Comment   string `yaml:"comment,omitempty" json:"comment,omitempty"`
+}
+
+// RenderedNAT is a resolved one-to-one static NAT on one interface.
+type RenderedNAT struct {
+	External  string `yaml:"external" json:"external"`
+	Internal  string `yaml:"internal" json:"internal"`
+	Interface string `yaml:"interface,omitempty" json:"interface,omitempty"`
+	Comment   string `yaml:"comment,omitempty" json:"comment,omitempty"`
 }
 
 type RenderedSettings struct {

internal/agent/translate.go

@@ -60,9 +60,192 @@ func Translate(rc *RenderedConfig) (*config.Config, error) {
 		})
 	}
 
+	for _, s := range rc.SNAT {
+		cfg.SNAT = append(cfg.SNAT, translateSNAT(s)...)
+	}
+	for _, n := range rc.Netmap {
+		cfg.Netmap = append(cfg.Netmap, config.Netmap{
+			Type:      config.NetmapType(n.Type),
+			Net1:      n.FromNet,
+			Net2:      n.ToNet,
+			Interface: n.Interface,
+			Comment:   n.Comment,
+		})
+	}
+	for _, n := range rc.NAT {
+		cfg.StaticNAT = append(cfg.StaticNAT, config.StaticNAT{
+			External:  n.External,
+			Internal:  n.Internal,
+			Interface: n.Interface,
+			Comment:   n.Comment,
+		})
+	}
+
+	for _, h := range rc.Hosts {
+		cfg.Hosts = append(cfg.Hosts, config.Host{
+			Zone: h.Zone, Interface: h.Interface, Addresses: h.Addresses,
+			Exclusions: h.Exclusions, Dynamic: h.Dynamic,
+		})
+	}
+	for _, p := range rc.Providers {
+		cfg.Providers = append(cfg.Providers, config.Provider{
+			Name: p.Name, Number: p.Number, Mark: p.Mark, Duplicate: p.Duplicate,
+			Interface: p.Interface, Gateway: p.Gateway, Copy: p.Copy,
+		})
+	}
+	for _, r := range rc.Routes {
+		cfg.Routes = append(cfg.Routes, config.StaticRoute{
+			Provider: r.Provider, Dest: r.Dest, Gateway: r.Gateway,
+			Device: r.Oif, Persistent: r.Persistent, Comment: r.Comment,
+		})
+	}
+	for _, r := range rc.RoutingRules {
+		cfg.RoutingRules = append(cfg.RoutingRules, config.RoutingRule{
+			Source: r.Source, Dest: r.Dest, Provider: r.Provider, Priority: r.Priority,
+			Persistent: r.Persistent, Mark: r.Mark, Comment: r.Comment,
+		})
+	}
+
+	for _, t := range rc.Tunnels {
+		cfg.Tunnels = append(cfg.Tunnels, config.Tunnel{
+			Type: t.Type, Zone: t.Zone, Gateways: t.Gateways,
+			GatewayZones: t.GatewayZones, Port: t.Port, Comment: t.Comment,
+		})
+	}
+	for _, r := range rc.StoppedRules {
+		cfg.StoppedRules = append(cfg.StoppedRules, config.StoppedRule{
+			Action: config.StoppedAction(r.Action), Source: r.Source, Dest: r.Dest,
+			Proto: r.Proto, DPort: config.PortSpec(r.DPort), SPort: config.PortSpec(r.SPort), Comment: r.Comment,
+		})
+	}
+	for _, p := range rc.ProxyARP {
+		cfg.ProxyARP = append(cfg.ProxyARP, config.ProxyARP{
+			Address: p.Address, Interface: p.Interface, External: p.External,
+			HaveRoute: p.HaveRoute, Persistent: p.Persistent, Comment: p.Comment,
+		})
+	}
+	for _, p := range rc.ProxyNDP {
+		cfg.ProxyNDP = append(cfg.ProxyNDP, config.ProxyNDP{
+			Address: p.Address, Interface: p.Interface, External: p.External,
+			HaveRoute: p.HaveRoute, Persistent: p.Persistent, Comment: p.Comment,
+		})
+	}
+	for _, a := range rc.ArpRules {
+		cfg.ArpRules = append(cfg.ArpRules, config.ArpRule{
+			Action: config.ArpAction(a.Action), ActionAddress: a.ActionAddress, ActionMAC: a.ActionMAC,
+			Source: a.Source, Dest: a.Dest, Opcode: a.Opcode, Comment: a.Comment,
+		})
+	}
+	for _, m := range rc.Maclist {
+		cfg.Maclist = append(cfg.Maclist, config.MaclistEntry{
+			Action: config.MaclistAction(m.Action), Interface: m.Interface, MAC: m.MAC,
+			Addresses: m.Addresses, Log: m.Log, Comment: m.Comment,
+		})
+	}
+
+	for _, m := range rc.Mangle {
+		mr := config.MangleRule{
+			Action: config.MangleAction(m.Action), Chain: config.MangleChain(m.Chain), MarkValue: m.MarkValue,
+			Source: m.Source, Dest: m.Dest, Proto: m.Proto, DPort: config.PortSpec(m.DPort), SPort: config.PortSpec(m.SPort),
+			User: m.User, Mark: m.Mark, Length: m.Length, TOS: m.TOS, Helper: m.Helper, Comment: m.Comment,
+		}
+		if m.Probability != nil {
+			mr.Probability = *m.Probability
+		}
+		cfg.Mangle = append(cfg.Mangle, mr)
+	}
+	for _, a := range rc.Accounting {
+		cfg.Accounting = append(cfg.Accounting, config.AccountingRule{
+			Action: config.AccountingAction(a.Action), Section: config.AccountingSection(a.Section), Chain: a.Chain,
+			Source: a.Source, Dest: a.Dest, Proto: a.Proto, DPort: config.PortSpec(a.DPort), SPort: config.PortSpec(a.SPort),
+			Mark: a.Mark, Comment: a.Comment,
+		})
+	}
+	for _, t := range rc.TCDevices {
+		cfg.TCDevices = append(cfg.TCDevices, config.TCDevice{
+			Interface: t.Interface, InBandwidth: t.InBandwidth, OutBandwidth: t.OutBandwidth, Comment: t.Comment,
+		})
+	}
+	for _, t := range rc.TCClasses {
+		cfg.TCClasses = append(cfg.TCClasses, config.TCClass{
+			Interface: t.Interface, Mark: t.Mark, Rate: t.Rate, Ceil: t.Ceil, Priority: t.Priority, Comment: t.Comment,
+		})
+	}
+	for _, t := range rc.TCFilters {
+		cfg.TCFilters = append(cfg.TCFilters, config.TCFilter{
+			Class: t.Class, Source: t.Source, Dest: t.Dest, Proto: t.Proto,
+			DPort: config.PortSpec(t.DPort), SPort: config.PortSpec(t.SPort),
+			TOS: t.TOS, Length: t.Length, Priority: t.Priority, Comment: t.Comment,
+		})
+	}
+	for _, t := range rc.TCInterfaces {
+		cfg.TCInterfaces = append(cfg.TCInterfaces, config.TCInterface{
+			Interface: t.Interface, Type: t.Type, InBandwidth: t.InBandwidth, OutBandwidth: t.OutBandwidth, Comment: t.Comment,
+		})
+	}
+	for _, t := range rc.TCPriorities {
+		cfg.TCPriorities = append(cfg.TCPriorities, config.TCPriority{
+			Band: t.Band, Proto: t.Proto, DPort: config.PortSpec(t.DPort), SPort: config.PortSpec(t.SPort),
+			Address: t.Address, Interface: t.Interface, Helper: t.Helper, Comment: t.Comment,
+		})
+	}
+
+	for _, b := range rc.Blrules {
+		cfg.Blrules = append(cfg.Blrules, config.BlruleRule{
+			Action: config.BlruleAction(b.Action), Source: b.Source, Dest: b.Dest, Proto: b.Proto,
+			DPort: config.PortSpec(b.DPort), SPort: config.PortSpec(b.SPort), Log: b.Log, Comment: b.Comment,
+		})
+	}
+	for _, c := range rc.Conntrack {
+		cfg.Conntrack = append(cfg.Conntrack, config.ConntrackRule{
+			Action: config.ConntrackAction(c.Action), Source: c.Source, Dest: c.Dest, Proto: c.Proto,
+			DPort: config.PortSpec(c.DPort), SPort: config.PortSpec(c.SPort),
+			Chain: config.ConntrackChain(c.Chain), Helper: c.Helper, User: c.User, Comment: c.Comment,
+		})
+	}
+	for _, sm := range rc.Secmarks {
+		cfg.Secmarks = append(cfg.Secmarks, config.SecmarkRule{
+			Secmark: sm.Secmark, Chain: sm.Chain, Source: sm.Source, Dest: sm.Dest, Proto: sm.Proto,
+			DPort: config.PortSpec(sm.DPort), SPort: config.PortSpec(sm.SPort), Comment: sm.Comment,
+		})
+	}
+	if len(rc.Vars) > 0 {
+		cfg.Vars = make(map[string]string, len(rc.Vars))
+		for k, v := range rc.Vars {
+			cfg.Vars[k] = v
+		}
+	}
+
 	return cfg, nil
 }
 
+// translateSNAT expands a rendered SNAT (which carries a list of egress
+// interfaces and source CIDRs) into native tomswall SNAT rules — one per
+// (egress interface, source) pair, since a native rule takes a single Dest.
+func translateSNAT(s RenderedSNAT) []config.SNATRule {
+	sources := s.Source
+	if len(sources) == 0 {
+		sources = []string{""}
+	}
+	var out []config.SNATRule
+	for _, egress := range s.Egress {
+		for _, src := range sources {
+			r := config.SNATRule{
+				Action:  config.SNATAction(s.Action),
+				Source:  src,
+				Dest:    egress,
+				Address: s.Address,
+				Comment: s.Comment,
+			}
+			if s.Probability != nil {
+				r.Probability = *s.Probability
+			}
+			out = append(out, r)
+		}
+	}
+	return out
+}
+
 // indexSets maps set name -> concrete member CIDRs (invalid members skipped).
 func indexSets(sets []RenderedSet) map[string][]string {
 	m := make(map[string][]string, len(sets))