mirror of
https://github.com/slackhq/nebula.git
synced 2026-08-15 07:06:59 +02:00
JackDoan
bc04261d0b
Resolving the template in userspace (LinkList then TUNSETIFF) races with concurrent instances: both can pick nebula0, and with multiqueue the loser silently attaches as a second queue to the winner's device instead of failing. TUNSETIFF natively substitutes a single %d via dev_alloc_name, atomically and always allocating a fresh device, so keep the fail-fast validation but pass the template through and read the resolved name back. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Fg7oD3uZ4jZjjQ4gRsPAwB
76 lines
2.3 KiB
Go
76 lines
2.3 KiB
Go
//go:build !e2e_testing
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// +build !e2e_testing
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package overlay
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import (
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"strings"
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"testing"
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"golang.org/x/sys/unix"
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)
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var runAdvMSSTests = []struct {
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name string
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tun *tun
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r Route
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expected int
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}{
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// Standard case, default MTU is the device max MTU
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{"default", &tun{DefaultMTU: 1440, MaxMTU: 1440}, Route{}, 0},
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{"default-min", &tun{DefaultMTU: 1440, MaxMTU: 1440}, Route{MTU: 1440}, 0},
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{"default-low", &tun{DefaultMTU: 1440, MaxMTU: 1440}, Route{MTU: 1200}, 1160},
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// Case where we have a route MTU set higher than the default
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{"route", &tun{DefaultMTU: 1440, MaxMTU: 8941}, Route{}, 1400},
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{"route-min", &tun{DefaultMTU: 1440, MaxMTU: 8941}, Route{MTU: 1440}, 1400},
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{"route-high", &tun{DefaultMTU: 1440, MaxMTU: 8941}, Route{MTU: 8941}, 0},
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}
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func TestTunAdvMSS(t *testing.T) {
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for _, tt := range runAdvMSSTests {
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t.Run(tt.name, func(t *testing.T) {
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o := tt.tun.advMSS(tt.r)
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if o != tt.expected {
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t.Errorf("got %d, want %d", o, tt.expected)
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}
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})
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}
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}
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func TestValidateTunName(t *testing.T) {
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// A device name must be shorter than IFNAMSIZ (i.e. IFNAMSIZ-1 chars max).
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maxLenName := strings.Repeat("a", unix.IFNAMSIZ-1)
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tests := []struct {
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name string
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tmpl string
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wantErr bool
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}{
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{"short literal name is fine", "nebula1", false},
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{"literal name at the max length is fine", maxLenName, false},
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{"literal name at IFNAMSIZ is rejected", strings.Repeat("a", unix.IFNAMSIZ), true},
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{"trailing template is fine", "nebula%d", false},
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{"mid-string template is fine", "neb%dprod", false},
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{"leading template is fine", "%dnebula", false},
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{"template at the max length is fine", strings.Repeat("a", unix.IFNAMSIZ-3) + "%d", false},
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{"template at IFNAMSIZ is rejected", strings.Repeat("a", unix.IFNAMSIZ-2) + "%d", true},
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{"bare %d is rejected", "%d", true},
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{"multiple %d is rejected", "neb%d%dprod", true},
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{"over-long template is rejected", strings.Repeat("a", unix.IFNAMSIZ-1) + "%d", true},
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{"over-long mid-string template is rejected", "neb%d" + strings.Repeat("a", unix.IFNAMSIZ-3), true},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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err := validateTunName(tt.tmpl)
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if tt.wantErr && err == nil {
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t.Fatalf("expected an error for %q, got none", tt.tmpl)
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}
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if !tt.wantErr && err != nil {
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t.Fatalf("unexpected error for %q: %v", tt.tmpl, err)
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}
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})
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}
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}
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