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@ -7,14 +7,17 @@
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package main // import "tailscale.com/cmd/tailscale"
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import (
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"bytes"
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"context"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"os"
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"os/signal"
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"runtime"
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"strconv"
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"strings"
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"syscall"
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@ -128,6 +131,27 @@ func parseIPOrCIDR(s string) (wgcfg.CIDR, bool) {
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}
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}
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// checkIPForwarding prints warnings on linux if IP forwarding is not
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// enabled, or if we were unable to verify the state of IP forwarding.
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func checkIPForwarding() {
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if runtime.GOOS != "linux" {
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return
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}
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bs, err := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward")
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if err != nil {
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fmt.Printf("Warning: couldn't check if IP forwarding is enabled (%v). IP forwarding must be enabled for subnet routes to work.", err)
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return
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}
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on, err := strconv.ParseBool(string(bytes.TrimSpace(bs)))
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if err != nil {
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fmt.Printf("Warning: couldn't check if IP forwarding is enabled (%v). IP forwarding must be enabled for subnet routes to work.", err)
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return
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}
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if !on {
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fmt.Printf("Warning: IP forwarding is disabled, subnet routes will not work.")
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}
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}
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func runUp(ctx context.Context, args []string) error {
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if len(args) > 0 {
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log.Fatalf("too many non-flag arguments: %q", args)
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@ -135,6 +159,7 @@ func runUp(ctx context.Context, args []string) error {
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var routes []wgcfg.CIDR
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if upArgs.advertiseRoutes != "" {
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checkIPForwarding()
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advroutes := strings.Split(upArgs.advertiseRoutes, ",")
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for _, s := range advroutes {
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cidr, ok := parseIPOrCIDR(s)
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