{"record":{"id":"54899b1c6af90f38","repo":"juanfont/headscale","slug":"protocol-number-out-of-range-0-255","errorCode":null,"errorMessage":"protocol number out of range (0-255)","messagePattern":"protocol number out of range \\(0-255\\)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"hscontrol/policy/v2/types.go","lineNumber":133,"sourceCode":"\tErrInvalidPrefix               = errors.New(\"invalid prefix\")\n\tErrInvalidAutogroup            = errors.New(\"invalid autogroup\")\n\tErrUnknownAutogroup            = errors.New(\"unknown autogroup\")\n\tErrHostportMissingColon        = errors.New(\"hostport must contain a colon\")\n\tErrTypeNotSupported            = errors.New(\"type not supported\")\n\tErrInvalidAlias                = errors.New(\"invalid alias format\")\n\tErrInvalidAutoApprover         = errors.New(\"invalid auto approver format\")\n\tErrInvalidOwner                = errors.New(\"invalid owner format\")\n\tErrGroupNotDefined             = errors.New(\"group not defined in policy\")\n\tErrInvalidGroupMember          = errors.New(\"invalid group member type\")\n\tErrGroupValueNotArray          = errors.New(\"group value must be an array of users\")\n\tErrInvalidHostIP               = errors.New(\"hostname contains invalid IP address\")\n\tErrTagNotDefined               = errors.New(\"tag not found\")\n\tErrAutoApproverNotAlias        = errors.New(\"auto approver is not an alias\")\n\tErrInvalidACLAction            = errors.New(\"invalid ACL action\")\n\tErrInvalidSSHAction            = errors.New(\"invalid SSH action\")\n\tErrInvalidProtocolNumber       = errors.New(\"invalid protocol number\")\n\tErrProtocolLeadingZero         = errors.New(\"leading 0 not permitted in protocol number\")\n\tErrProtocolOutOfRange          = errors.New(\"protocol number out of range (0-255)\")\n\tErrAutogroupNotSupported       = errors.New(\"autogroup not supported in headscale\")\n\tErrAutogroupInternetSrc        = errors.New(\"autogroup:internet can only be used in ACL destinations\")\n\tErrAutogroupSelfSrc            = errors.New(\"\\\"autogroup:self\\\" not valid on the src side of a rule\")\n\tErrAutogroupNotSupportedACLSrc = errors.New(\"autogroup not supported for ACL sources\")\n\tErrAutogroupNotSupportedACLDst = errors.New(\"autogroup not supported for ACL destinations\")\n\tErrAutogroupDangerAllDst       = errors.New(\"cannot use autogroup:danger-all as a dst\")\n\tErrAutogroupNotSupportedSSHSrc = errors.New(\"autogroup not supported for SSH sources\")\n\tErrAutogroupNotSupportedSSHDst = errors.New(\"autogroup not supported for SSH destinations\")\n\tErrHostNotDefined              = errors.New(\"host not defined in policy\")\n\tErrSSHSourceAliasNotSupported  = errors.New(\"alias not supported for SSH source\")\n\tErrSSHDestAliasNotSupported    = errors.New(\"alias not supported for SSH destination\")\n\tErrUnknownField                = errors.New(\"unknown field\")\n\tErrProtocolNoSpecificPorts     = errors.New(\"protocol does not support specific ports\")\n\tErrTestEmptyAssertions         = errors.New(\"test entry must have at least one of \\\"accept\\\" or \\\"deny\\\"\")\n\tErrTestProtocolNotAllowed      = errors.New(\"test protocol must be tcp, udp, sctp, or empty\")\n\tErrTestDestinationMultiPort    = errors.New(\"test destination port must be a single port\")\n\tErrTestDestinationCIDR         = errors.New(\"test destination must be a single host, not a CIDR range\")\n\tErrAutogroupInternetTestDst    = errors.New(\"autogroup:internet not valid as a test destination\")","sourceCodeStart":115,"sourceCodeEnd":151,"githubUrl":"https://github.com/juanfont/headscale/blob/565fd254d06c4c7f9a8cad1714a43445c79ba420/hscontrol/policy/v2/types.go#L115-L151","documentation":"Returned by Protocol.validate (hscontrol/policy/v2/types.go:1779) when a numeric \"proto\" value parses as an integer but falls outside 0-255, the IANA IP protocol number range. The offending number is included in the wrapped message.","triggerScenarios":"Policy with \"proto\": \"256\", \"proto\": \"1000\", or a negative value that Atoi accepts. Anything that is not a protocol name and parses as an out-of-range integer.","commonSituations":"Pasting port numbers into the proto field (e.g. 8080), using an IANA service number instead of a protocol number, or generation scripts with wrong fields.","solutions":["Use a protocol number within 0-255 (e.g. 6=tcp, 17=udp, 47=gre)","Double-check you did not put a port in the proto field — ports belong in dst like \"tag:host:443\"","Use a named protocol where available"],"exampleFix":"// before\n{\"action\": \"accept\", \"proto\": \"8080\", \"src\": [\"*\"], \"dst\": [\"tag:web:*\"]}\n\n// after\n{\"action\": \"accept\", \"proto\": \"tcp\", \"src\": [\"*\"], \"dst\": [\"tag:web:8080\"]}","handlingStrategy":"validation","validationCode":"n, err := strconv.Atoi(protoStr)\nif err == nil && (n < 0 || n > 255) {\n\treturn fmt.Errorf(\"proto %d out of range 0-255\", n)\n}","typeGuard":"func isProtocolOutOfRange(err error) bool {\n\treturn errors.Is(err, policy.ErrProtocolOutOfRange)\n}","tryCatchPattern":"if err := json.Unmarshal(b, &acl); err != nil {\n\tif errors.Is(err, policy.ErrProtocolOutOfRange) {\n\t\treturn fmt.Errorf(\"proto number must be 0-255 (did you put a port there?): %w\", err)\n\t}\n\treturn err\n}","preventionTips":["Double-check the proto field is not accidentally a port (8080) or service number","Validate generated policies numerically before deploying","Keep an IANA protocol-number reference handy when using numbers"],"tags":["policy","acl","protocol","validation"],"backgroundTag":null,"analyzedSha":"565fd254d06c4c7f9a8cad1714a43445c79ba420","analyzedAt":"2026-08-15T13:12:30.133Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}