// SPDX-FileCopyrightText: 2026 The Pion community <https://pion.ly>

// SPDX-License-Identifier: MIT

package sctp

import (

"errors"

"fmt"

)

/*

This error cause MAY be included in ABORT chunks that are sent

because an SCTP endpoint detects a protocol violation of the peer

that is not covered by the error causes described in Section 3.3.10.1

to Section 3.3.10.12. An implementation MAY provide additional

information specifying what kind of protocol violation has been

detected.

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Cause Code=13 | Cause Length=Variable |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

/ Additional Information /

\ \

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

*/

type errorCauseProtocolViolation struct {

errorCauseHeader

additionalInformation []byte

}

// Abort chunk errors.

var (

ErrProtocolViolationUnmarshal = errors.New("unable to unmarshal Protocol Violation error")

)

func (e *errorCauseProtocolViolation) marshal() ([]byte, error) {

e.raw = e.additionalInformation

return e.errorCauseHeader.marshal()

}

func (e *errorCauseProtocolViolation) unmarshal(raw []byte) error {

err := e.errorCauseHeader.unmarshal(raw)

if err != nil {

return fmt.Errorf("%w: %v", ErrProtocolViolationUnmarshal, err) //nolint:errorlint

}

e.additionalInformation = e.raw

return nil

}

// String makes errorCauseProtocolViolation printable.

func (e *errorCauseProtocolViolation) String() string {

return fmt.Sprintf("%s: %s", e.errorCauseHeader, e.additionalInformation)

}