nebula/overlay/tun.go

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package overlay
import (
"net"
"github.com/sirupsen/logrus"
"github.com/slackhq/nebula/config"
"github.com/slackhq/nebula/util"
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)
const DefaultMTU = 1300
type DeviceFactory func(c *config.C, l *logrus.Logger, tunCidr *net.IPNet, routines int) (Device, error)
func NewDeviceFromConfig(c *config.C, l *logrus.Logger, tunCidr *net.IPNet, routines int) (Device, error) {
routes, err := parseRoutes(c, tunCidr)
if err != nil {
return nil, util.NewContextualError("Could not parse tun.routes", nil, err)
}
unsafeRoutes, err := parseUnsafeRoutes(c, tunCidr)
if err != nil {
return nil, util.NewContextualError("Could not parse tun.unsafe_routes", nil, err)
}
routes = append(routes, unsafeRoutes...)
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switch {
case c.GetBool("tun.disabled", false):
tun := newDisabledTun(tunCidr, c.GetInt("tun.tx_queue", 500), c.GetBool("stats.message_metrics", false), l)
return tun, nil
default:
return newTun(
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l,
c.GetString("tun.dev", ""),
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tunCidr,
c.GetInt("tun.mtu", DefaultMTU),
routes,
c.GetInt("tun.tx_queue", 500),
routines > 1,
c.GetBool("tun.use_system_route_table", false),
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)
}
}
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func NewFdDeviceFromConfig(fd *int) DeviceFactory {
return func(c *config.C, l *logrus.Logger, tunCidr *net.IPNet, routines int) (Device, error) {
routes, err := parseRoutes(c, tunCidr)
if err != nil {
return nil, util.NewContextualError("Could not parse tun.routes", nil, err)
}
unsafeRoutes, err := parseUnsafeRoutes(c, tunCidr)
if err != nil {
return nil, util.NewContextualError("Could not parse tun.unsafe_routes", nil, err)
}
routes = append(routes, unsafeRoutes...)
return newTunFromFd(
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l,
*fd,
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tunCidr,
c.GetInt("tun.mtu", DefaultMTU),
routes,
c.GetInt("tun.tx_queue", 500),
c.GetBool("tun.use_system_route_table", false),
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)
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}
}