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tstest/natlab/vnet: start adding tests

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And refactor some of vnet.go for testability.

The only behavioral change (with a new test) is that ethernet
broadcasts no longer get sent back to the sender.

Updates #13038

Change-Id: Ic2e7e7d6d8805b7b7f2b5c52c2c5ba97101cef14
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-08-26 22:21:14 -07:00
committed by Brad Fitzpatrick
parent 31cdbd68b1
commit ff1d0aa027
3 changed files with 403 additions and 100 deletions
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20
tstest/natlab/vnet/conf.go
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@@ -6,7 +6,6 @@ package vnet
import (
"cmp"
"fmt"
"log"
"net/netip"
"os"
"slices"
@@ -61,6 +60,11 @@ func (c *Config) FirstNetwork() *Network {
return c.networks[0]
}
func nodeMac(n int) MAC {
// 52=TS then 0xcc for cccclient
return MAC{0x52, 0xcc, 0xcc, 0xcc, 0xcc, byte(n)}
}
// AddNode creates a new node in the world.
//
// The opts may be of the following types:
@@ -70,10 +74,10 @@ func (c *Config) FirstNetwork() *Network {
// On an error or unknown opt type, AddNode returns a
// node with a carried error that gets returned later.
func (c *Config) AddNode(opts ...any) *Node {
num := len(c.nodes)
num := len(c.nodes) + 1
n := &Node{
num: num + 1,
mac: MAC{0x52, 0xcc, 0xcc, 0xcc, 0xcc, byte(num) + 1}, // 52=TS then 0xcc for ccclient
num: num,
mac: nodeMac(num),
}
c.nodes = append(c.nodes, n)
for _, o := range opts {
@@ -130,10 +134,10 @@ type TailscaledEnv struct {
// On an error or unknown opt type, AddNetwork returns a
// network with a carried error that gets returned later.
func (c *Config) AddNetwork(opts ...any) *Network {
num := len(c.networks)
num := len(c.networks) + 1
n := &Network{
num: num + 1,
mac: MAC{0x52, 0xee, 0xee, 0xee, 0xee, byte(num) + 1}, // 52=TS then 0xee for 'etwork
num: num,
mac: MAC{0x52, 0xee, 0xee, 0xee, 0xee, byte(num)}, // 52=TS then 0xee for 'etwork
}
c.networks = append(c.networks, n)
for _, o := range opts {
@@ -330,7 +334,7 @@ func (s *Server) initFromConfig(c *Config) error {
lanIP4: conf.lanIP4,
nodesByIP4: map[netip.Addr]*node{},
nodesByMAC: map[MAC]*node{},
logf: logger.WithPrefix(log.Printf, fmt.Sprintf("[net-%v] ", conf.mac)),
logf: logger.WithPrefix(s.logf, fmt.Sprintf("[net-%v] ", conf.mac)),
}
netOfConf[conf] = n
s.networks.Add(n)