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This commit is contained in:
JackDoan
2025-10-14 13:46:21 -05:00
parent 36daea9551
commit 3583a3f7ab
1 changed files with 11 additions and 5 deletions
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16
overlay/tun_linux.go
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@@ -137,13 +137,19 @@ func findNextTunName(tunName string) (string, error) {
if len(tunName) == 2 { if len(tunName) == 2 {
return "", errors.New("please don't name your tun device '%d'") return "", errors.New("please don't name your tun device '%d'")
} }
tunNameTemplate := tunName[:len(tunName)-2]
if (len(tunName) - len("%d") + len("0")) > unix.IFNAMSIZ {
return "", fmt.Errorf("your tun device name template %s would result in a name longer than the maximum allowed length of %d", tunName, unix.IFNAMSIZ)
}
tunNameTemplate := tunName[:len(tunName)-len("%d")]
links, err := netlink.LinkList() links, err := netlink.LinkList()
if err != nil { if err != nil {
return "", err return "", err
} }
var candidateName string var candidateName string
for i := 0; i < 100000; i++ { i := 0
for {
candidateName = fmt.Sprintf("%s%d", tunNameTemplate, i) candidateName = fmt.Sprintf("%s%d", tunNameTemplate, i)
good := true good := true
for _, link := range links { for _, link := range links {
@@ -152,10 +158,10 @@ func findNextTunName(tunName string) (string, error) {
break break
} }
} }
if len(candidateName) > unix.IFNAMSIZ {
return "", fmt.Errorf("first available tun device is %s, which is longer than the max allowed size of %d", candidateName, unix.IFNAMSIZ)
}
if good { if good {
if len(candidateName) > 16 {
return "", errors.New("you have too many nebula networks")
}
return candidateName, nil return candidateName, nil
} }
} }