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cmd/tailscale/cli: add CLI option to offer an exit node to the tailnet.

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Finishes up linux part of #1154.

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2021-02-24 11:33:03 -08:00
parent e9e4f1063d
commit ebf3f2fd9f
1 changed files with 34 additions and 15 deletions
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23
cmd/tailscale/cli/up.go
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@ -14,6 +14,7 @@
"os"
"os/exec"
"runtime"
"sort"
"strconv"
"strings"
"sync"
@ -53,6 +54,7 @@
upf.StringVar(&upArgs.hostname, "hostname", "", "hostname to use instead of the one provided by the OS")
if runtime.GOOS == "linux" || isBSD(runtime.GOOS) || version.OS() == "macOS" {
upf.StringVar(&upArgs.advertiseRoutes, "advertise-routes", "", "routes to advertise to other nodes (comma-separated, e.g. 10.0.0.0/8,192.168.0.0/24)")
upf.BoolVar(&upArgs.advertiseDefaultRoute, "advertise-exit-node", false, "offer to be an exit node for internet traffic for the tailnet")
}
if runtime.GOOS == "linux" {
upf.BoolVar(&upArgs.snat, "snat-subnet-routes", true, "source NAT traffic to local routes advertised with --advertise-routes")
@ -79,6 +81,7 @@ func defaultNetfilterMode() string {
shieldsUp bool
forceReauth bool
advertiseRoutes string
advertiseDefaultRoute bool
advertiseTags string
snat bool
netfilterMode string
@ -148,7 +151,7 @@ func runUp(ctx context.Context, args []string) error {
}
}
var routes []netaddr.IPPrefix
routeMap := map[netaddr.IPPrefix]bool{}
var default4, default6 bool
if upArgs.advertiseRoutes != "" {
advroutes := strings.Split(upArgs.advertiseRoutes, ",")
@ -165,15 +168,31 @@ func runUp(ctx context.Context, args []string) error {
} else if ipp == ipv6default {
default6 = true
}
routes = append(routes, ipp)
routeMap[ipp] = true
}
if default4 && !default6 {
fatalf("%s advertised without its IPv6 counterpart, please also advertise %s", ipv4default, ipv6default)
} else if default6 && !default4 {
fatalf("%s advertised without its IPv6 counterpart, please also advertise %s", ipv6default, ipv4default)
}
}
if upArgs.advertiseDefaultRoute {
routeMap[netaddr.MustParseIPPrefix("0.0.0.0/0")] = true
routeMap[netaddr.MustParseIPPrefix("::/0")] = true
}
if len(routeMap) > 0 {
checkIPForwarding()
}
routes := make([]netaddr.IPPrefix, 0, len(routeMap))
for r := range routeMap {
routes = append(routes, r)
}
sort.Slice(routes, func(i, j int) bool {
if routes[i].Bits != routes[j].Bits {
return routes[i].Bits < routes[j].Bits
}
return routes[i].IP.Less(routes[j].IP)
})
var exitNodeIP netaddr.IP
if upArgs.exitNodeIP != "" {