69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
package overlay
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import (
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"fmt"
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"net"
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"runtime"
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"github.com/sirupsen/logrus"
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"github.com/slackhq/nebula/cidr"
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"github.com/slackhq/nebula/config"
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"github.com/slackhq/nebula/util"
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)
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const DefaultMTU = 1300
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func NewDeviceFromConfig(c *config.C, l *logrus.Logger, tunCidr *net.IPNet, fd *int, routines int) (Device, error) {
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routes, err := parseRoutes(c, tunCidr)
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if err != nil {
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return nil, util.NewContextualError("Could not parse tun.routes", nil, err)
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}
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unsafeRoutes, err := parseUnsafeRoutes(c, tunCidr)
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if err != nil {
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return nil, util.NewContextualError("Could not parse tun.unsafe_routes", nil, err)
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}
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routes = append(routes, unsafeRoutes...)
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switch {
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case c.GetBool("tun.disabled", false):
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tun := newDisabledTun(tunCidr, c.GetInt("tun.tx_queue", 500), c.GetBool("stats.message_metrics", false), l)
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return tun, nil
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case fd != nil:
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return newTunFromFd(
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l,
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*fd,
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tunCidr,
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c.GetInt("tun.mtu", DefaultMTU),
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routes,
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c.GetInt("tun.tx_queue", 500),
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)
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default:
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return newTun(
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l,
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c.GetString("tun.dev", ""),
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tunCidr,
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c.GetInt("tun.mtu", DefaultMTU),
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routes,
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c.GetInt("tun.tx_queue", 500),
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routines > 1,
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)
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}
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}
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func makeCidrTree(routes []Route, allowMTU bool) (*cidr.Tree4, error) {
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cidrTree := cidr.NewTree4()
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for _, r := range routes {
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if !allowMTU && r.MTU > 0 {
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return nil, fmt.Errorf("route MTU is not supported in %s", runtime.GOOS)
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}
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if r.Via != nil {
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cidrTree.AddCIDR(r.Cidr, r.Via)
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}
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}
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return cidrTree, nil
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}
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