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private.go
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private.go
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package routeman
import (
"errors"
"net"
"os"
"github.com/black-desk/cgtproxy/pkg/cgtproxy/config"
"github.com/black-desk/cgtproxy/pkg/nftman"
. "github.com/black-desk/lib/go/errwrap"
"github.com/vishvananda/netlink"
"golang.org/x/sys/unix"
)
func (m *RouteManager) initializeNftableRuels() (err error) {
defer Wrap(&err, "initializing nftable rules")
for _, tp := range m.cfg.TProxies {
err = m.nft.AddChainAndRulesForTProxy(tp)
if err != nil {
return
}
err = m.addRule(tp.Mark)
if err != nil {
return
}
}
return
}
func (m *RouteManager) removeNftableRules() {
err := m.nft.Clear()
if err != nil {
m.log.Errorw("Failed to delete nft table.",
"error", err,
)
}
for _, rule := range m.rule {
err = netlink.RuleDel(rule)
if err == nil {
continue
}
m.log.Errorw("Failed to delete route rule.",
"rule", rule,
"error", err,
)
}
return
}
func (m *RouteManager) addRule(mark config.FireWallMark) (err error) {
defer Wrap(&err, "add route rule")
m.log.Infow("Adding route rule.",
"mark", mark,
"table", m.cfg.RouteTable,
)
// ip rule add fwmark <mark> lookup <table>
rule := netlink.NewRule()
rule.Family = netlink.FAMILY_ALL
rule.Mark = int(mark) // WARN(black_desk): ???
rule.Table = m.cfg.RouteTable
err = netlink.RuleAdd(rule)
if errors.Is(err, os.ErrExist) {
m.log.Infow("Rule already exists.")
err = nil
}
if err != nil {
return
}
m.rule = append(m.rule, rule)
return
}
func (m *RouteManager) addRoute() (err error) {
defer Wrap(&err, "add route")
m.log.Infow("Adding route.",
"table", m.cfg.RouteTable,
)
// ip route add local default dev lo table <table>
var iface *net.Interface
iface, err = net.InterfaceByName("lo")
if err != nil {
return
}
cidrStrs := []string{"0.0.0.0/0", "0::0/0"}
for _, cidrStr := range cidrStrs {
var cidr *net.IPNet
_, cidr, err = net.ParseCIDR(cidrStr)
if err != nil {
return
}
route := &netlink.Route{
LinkIndex: iface.Index,
Scope: unix.RT_SCOPE_HOST,
Dst: cidr,
Table: m.cfg.RouteTable,
Type: unix.RTN_LOCAL,
}
err = netlink.RouteAdd(route)
if errors.Is(err, os.ErrExist) {
m.log.Infow("Route already exists.",
"route", route,
)
err = nil
}
if err != nil {
return
}
m.route = append(m.route, route)
}
return
}
func (m *RouteManager) removeRoute() {
for i := range m.route {
err := netlink.RouteDel(m.route[i])
if err == nil {
continue
}
m.log.Warnw("Failed to remove route",
"error", err)
}
return
}
func (m *RouteManager) handleNewCgroup(path string) (err error) {
defer Wrap(&err, "handle new cgroup")
m.log.Debugw("Handling new cgroup.",
"path", path,
)
var target nftman.Target
for i := range m.matchers {
if !m.matchers[i].reg.Match([]byte(path)) {
continue
}
m.log.Infow("Rule found for this cgroup",
"cgroup", path,
"rule", m.cfg.Rules[i].String(),
)
target = m.matchers[i].target
break
}
if target.Op == nftman.TargetNoop {
m.log.Debugw("No rule match this cgroup",
"cgroup", path,
)
return
}
err = m.nft.AddCgroup(path, &target)
if err != nil {
return
}
return
}
func (m *RouteManager) handleDeleteCgroup(path string) (err error) {
defer Wrap(&err, "handle delete cgroup")
m.log.Debugw("Handling delete cgroup.",
"path", path,
)
err = m.nft.RemoveCgroup(path)
if err != nil {
return
}
return
}