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wgengine/router: more comments.

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Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2020-05-15 02:58:22 +00:00 committed by Dave Anderson
parent 0fe262f093
commit 3e27b3c33c
1 changed files with 6 additions and 0 deletions
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6
wgengine/router/router_linux.go
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@ -53,6 +53,9 @@ const (
// avoid allocating Tailscale IPs from it, to avoid conflicts.
const chromeOSVMRange = "100.115.92.0/23"
// netfilterRunner abstracts helpers to run netfilter commands. It
// exists purely to swap out go-iptables for a fake implementation in
// tests.
type netfilterRunner interface {
Insert(table, chain string, pos int, args ...string) error
Append(table, chain string, args ...string) error
@ -64,6 +67,9 @@ type netfilterRunner interface {
DeleteChain(table, chain string) error
}
// commandRunner abstracts helpers to run OS commands. It exists
// purely to swap out osCommandRunner (below) with a fake runner in
// tests.
type commandRunner interface {
run(...string) error
output(...string) ([]byte, error)