mirror of
https://github.com/gravitl/netmaker.git
synced 2025-10-05 16:57:51 +08:00
294 lines
10 KiB
Go
294 lines
10 KiB
Go
package logic
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import (
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"encoding/json"
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"errors"
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"strings"
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"time"
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"github.com/gravitl/netmaker/database"
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"github.com/gravitl/netmaker/logger"
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"github.com/gravitl/netmaker/models"
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)
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// CreateEgressGateway - creates an egress gateway
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func CreateEgressGateway(gateway models.EgressGatewayRequest) (models.Node, error) {
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node, err := GetNodeByID(gateway.NodeID)
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if err != nil {
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return models.Node{}, err
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}
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if node.OS != "linux" && node.OS != "freebsd" { // add in darwin later
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return models.Node{}, errors.New(node.OS + " is unsupported for egress gateways")
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}
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if gateway.NatEnabled == "" {
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gateway.NatEnabled = "yes"
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}
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err = ValidateEgressGateway(gateway)
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if err != nil {
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return models.Node{}, err
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}
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node.IsEgressGateway = "yes"
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node.EgressGatewayRanges = gateway.Ranges
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node.EgressGatewayNatEnabled = gateway.NatEnabled
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postUpCmd := ""
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postDownCmd := ""
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if node.OS == "linux" {
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// nftables only supported on Linux
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if IsNFTablesPresent() {
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// assumes chains eg FORWARD and POSTROUTING already exist
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logger.Log(3, "creating egress gateway using nftables")
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postUpCmd = "nft add rule ip filter FORWARD iifname " + node.Interface + " counter accept ; "
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postUpCmd += "nft add rule ip filter FORWARD oifname " + node.Interface + " counter accept ; "
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postDownCmd = "nft delete rule ip filter FORWARD iifname " + node.Interface + " counter accept ; "
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postDownCmd += "nft delete rule ip filter FORWARD oifname " + node.Interface + " counter accept ; "
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if node.EgressGatewayNatEnabled == "yes" {
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postUpCmd += "nft add rule ip nat POSTROUTING oifname " + node.Interface + " counter masquerade ;"
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postDownCmd += "nft delete rule ip nat POSTROUTING oifname " + node.Interface + " counter masquerade ;"
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}
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} else {
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logger.Log(3, "creating egress gateway using iptables")
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postUpCmd = "iptables -A FORWARD -i " + node.Interface + " -j ACCEPT; "
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postUpCmd += "iptables -A FORWARD -o " + node.Interface + " -j ACCEPT"
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postDownCmd = "iptables -D FORWARD -i " + node.Interface + " -j ACCEPT; "
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postDownCmd += "iptables -D FORWARD -o " + node.Interface + " -j ACCEPT"
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if node.EgressGatewayNatEnabled == "yes" {
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postUpCmd += "; iptables -t nat -A POSTROUTING -o " + gateway.Interface + " -j MASQUERADE"
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postDownCmd += "; iptables -t nat -D POSTROUTING -o " + gateway.Interface + " -j MASQUERADE"
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}
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}
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}
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if node.OS == "freebsd" {
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postUpCmd = "kldload ipfw ipfw_nat ; "
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postUpCmd += "ipfw disable one_pass ; "
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postUpCmd += "ipfw nat 1 config if " + gateway.Interface + " same_ports unreg_only reset ; "
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postUpCmd += "ipfw add 64000 reass all from any to any in ; "
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postUpCmd += "ipfw add 64000 nat 1 ip from any to any in via " + gateway.Interface + " ; "
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postUpCmd += "ipfw add 64000 check-state ; "
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postUpCmd += "ipfw add 64000 nat 1 ip from any to any out via " + gateway.Interface + " ; "
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postUpCmd += "ipfw add 65534 allow ip from any to any ; "
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postDownCmd = "ipfw delete 64000 ; "
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postDownCmd += "ipfw delete 65534 ; "
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postDownCmd += "kldunload ipfw_nat ipfw"
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}
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if gateway.PostUp != "" {
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postUpCmd = gateway.PostUp
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}
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if gateway.PostDown != "" {
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postDownCmd = gateway.PostDown
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}
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if node.PostUp != "" {
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if !strings.Contains(node.PostUp, postUpCmd) {
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postUpCmd = node.PostUp + "; " + postUpCmd
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}
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}
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if node.PostDown != "" {
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if !strings.Contains(node.PostDown, postDownCmd) {
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postDownCmd = node.PostDown + "; " + postDownCmd
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}
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}
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node.PostUp = postUpCmd
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node.PostDown = postDownCmd
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node.SetLastModified()
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nodeData, err := json.Marshal(&node)
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if err != nil {
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return node, err
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}
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if err = database.Insert(node.ID, string(nodeData), database.NODES_TABLE_NAME); err != nil {
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return models.Node{}, err
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}
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if err = NetworkNodesUpdatePullChanges(node.Network); err != nil {
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return models.Node{}, err
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}
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return node, nil
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}
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// ValidateEgressGateway - validates the egress gateway model
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func ValidateEgressGateway(gateway models.EgressGatewayRequest) error {
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var err error
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empty := len(gateway.Ranges) == 0
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if empty {
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err = errors.New("IP Ranges Cannot Be Empty")
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}
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empty = gateway.Interface == ""
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if empty {
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err = errors.New("interface cannot be empty")
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}
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return err
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}
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// DeleteEgressGateway - deletes egress from node
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func DeleteEgressGateway(network, nodeid string) (models.Node, error) {
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node, err := GetNodeByID(nodeid)
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if err != nil {
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return models.Node{}, err
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}
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node.IsEgressGateway = "no"
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node.EgressGatewayRanges = []string{}
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node.PostUp = ""
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node.PostDown = ""
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if node.IsIngressGateway == "yes" { // check if node is still an ingress gateway before completely deleting postdown/up rules
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if node.OS == "linux" {
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// nftables only supported on Linux
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if IsNFTablesPresent() {
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// assumes chains eg FORWARD and POSTROUTING already exist
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logger.Log(3, "deleting egress gateway using nftables")
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node.PostUp = "nft add rule ip filter FORWARD iifname " + node.Interface + " counter accept ; "
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node.PostUp += "nft add rule ip filter FORWARD oifname " + node.Interface + " counter accept ; "
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node.PostUp += "nft add rule ip nat POSTROUTING oifname " + node.Interface + " counter masquerade ; "
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node.PostDown = "nft delete rule ip filter FORWARD iifname " + node.Interface + " counter accept ;"
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node.PostDown += "nft delete rule ip filter FORWARD iifname " + node.Interface + " counter accept ;"
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node.PostDown += "nft delete rule ip nat POSTROUTING oifname " + node.Interface + " counter masquerade "
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} else {
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logger.Log(3, "deleting egress gateway using iptables")
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node.PostUp = "iptables -A FORWARD -i " + node.Interface + " -j ACCEPT ; "
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node.PostUp += "iptables -A FORWARD -o " + node.Interface + " -j ACCEPT ; "
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node.PostUp += "iptables -t nat -A POSTROUTING -o " + node.Interface + " -j MASQUERADE"
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node.PostDown = "iptables -D FORWARD -i " + node.Interface + " -j ACCEPT ; "
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node.PostDown += "iptables -D FORWARD -o " + node.Interface + " -j ACCEPT ; "
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node.PostDown += "iptables -t nat -D POSTROUTING -o " + node.Interface + " -j MASQUERADE"
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}
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}
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if node.OS == "freebsd" {
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node.PostUp = ""
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node.PostDown = "ipfw delete 64000 ; "
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node.PostDown += "ipfw delete 65534 ; "
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node.PostDown += "kldunload ipfw_nat ipfw"
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}
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}
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node.SetLastModified()
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data, err := json.Marshal(&node)
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if err != nil {
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return models.Node{}, err
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}
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if err = database.Insert(node.ID, string(data), database.NODES_TABLE_NAME); err != nil {
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return models.Node{}, err
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}
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if err = NetworkNodesUpdatePullChanges(network); err != nil {
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return models.Node{}, err
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}
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return node, nil
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}
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// CreateIngressGateway - creates an ingress gateway
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func CreateIngressGateway(netid string, nodeid string) (models.Node, error) {
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var postUpCmd, postDownCmd string
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node, err := GetNodeByID(nodeid)
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if node.OS != "linux" { // add in darwin later
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return models.Node{}, errors.New(node.OS + " is unsupported for ingress gateways")
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}
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if err != nil {
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return models.Node{}, err
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}
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network, err := GetParentNetwork(netid)
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if err != nil {
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return models.Node{}, err
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}
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node.IsIngressGateway = "yes"
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node.IngressGatewayRange = network.AddressRange
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if IsNFTablesPresent() {
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// assumes chains eg FORWARD and POSTROUTING already exist
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logger.Log(3, "creating ingress gateway using nftables")
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postUpCmd = "nft add rule ip filter FORWARD iifname " + node.Interface + " counter accept ; "
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postUpCmd += "nft add rule ip filter FORWARD oifname " + node.Interface + " counter accept ; "
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postUpCmd += "nft add rule ip nat POSTROUTING oifname " + node.Interface + " counter masquerade"
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postDownCmd = "nft delete rule ip filter FORWARD iifname " + node.Interface + " counter accept ; "
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postDownCmd += "nft delete rule ip filter FORWARD oifname " + node.Interface + " counter accept ; "
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postDownCmd += "nft delete rule ip nat POSTROUTING oifname " + node.Interface + " counter masquerade"
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} else {
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logger.Log(3, "creating ingress gateway using iptables")
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postUpCmd = "iptables -A FORWARD -i " + node.Interface + " -j ACCEPT ; "
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postUpCmd += "iptables -A FORWARD -o " + node.Interface + " -j ACCEPT ; "
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postUpCmd += "iptables -t nat -A POSTROUTING -o " + node.Interface + " -j MASQUERADE"
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postDownCmd = "iptables -D FORWARD -i " + node.Interface + " -j ACCEPT ; "
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postDownCmd += "iptables -D FORWARD -o " + node.Interface + " -j ACCEPT ; "
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postDownCmd += "iptables -t nat -D POSTROUTING -o " + node.Interface + " -j MASQUERADE"
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}
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if node.PostUp != "" {
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if !strings.Contains(node.PostUp, postUpCmd) {
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postUpCmd = node.PostUp + "; " + postUpCmd
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}
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}
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if node.PostDown != "" {
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if !strings.Contains(node.PostDown, postDownCmd) {
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postDownCmd = node.PostDown + "; " + postDownCmd
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}
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}
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node.SetLastModified()
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node.PostUp = postUpCmd
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node.PostDown = postDownCmd
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node.UDPHolePunch = "no"
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data, err := json.Marshal(&node)
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if err != nil {
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return models.Node{}, err
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}
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err = database.Insert(node.ID, string(data), database.NODES_TABLE_NAME)
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if err != nil {
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return models.Node{}, err
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}
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err = SetNetworkNodesLastModified(netid)
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return node, err
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}
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// DeleteIngressGateway - deletes an ingress gateway
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func DeleteIngressGateway(networkName string, nodeid string) (models.Node, error) {
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node, err := GetNodeByID(nodeid)
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if err != nil {
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return models.Node{}, err
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}
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network, err := GetParentNetwork(networkName)
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if err != nil {
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return models.Node{}, err
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}
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// delete ext clients belonging to ingress gateway
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if err = DeleteGatewayExtClients(node.ID, networkName); err != nil {
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return models.Node{}, err
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}
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node.UDPHolePunch = network.DefaultUDPHolePunch
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node.LastModified = time.Now().Unix()
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node.IsIngressGateway = "no"
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node.IngressGatewayRange = ""
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data, err := json.Marshal(&node)
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if err != nil {
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return models.Node{}, err
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}
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err = database.Insert(node.ID, string(data), database.NODES_TABLE_NAME)
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if err != nil {
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return models.Node{}, err
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}
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err = SetNetworkNodesLastModified(networkName)
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return node, err
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}
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// DeleteGatewayExtClients - deletes ext clients based on gateway (mac) of ingress node and network
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func DeleteGatewayExtClients(gatewayID string, networkName string) error {
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currentExtClients, err := GetNetworkExtClients(networkName)
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if err != nil && !database.IsEmptyRecord(err) {
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return err
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}
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for _, extClient := range currentExtClients {
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if extClient.IngressGatewayID == gatewayID {
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if err = DeleteExtClient(networkName, extClient.ClientID); err != nil {
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logger.Log(1, "failed to remove ext client", extClient.ClientID)
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continue
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}
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}
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}
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return nil
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}
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