93 lines
3.2 KiB
Go
93 lines
3.2 KiB
Go
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package sctp
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import (
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"encoding/binary"
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"errors"
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"fmt"
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)
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// This parameter is used by the receiver of a Re-configuration Request
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// Parameter to respond to the request.
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//
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// 0 1 2 3
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// 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
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Parameter Type = 16 | Parameter Length |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Re-configuration Response Sequence Number |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Result |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Sender's Next TSN (optional) |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Receiver's Next TSN (optional) |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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type paramReconfigResponse struct {
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paramHeader
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// This value is copied from the request parameter and is used by the
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// receiver of the Re-configuration Response Parameter to tie the
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// response to the request.
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reconfigResponseSequenceNumber uint32
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// This value describes the result of the processing of the request.
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result reconfigResult
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}
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type reconfigResult uint32
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const (
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reconfigResultSuccessNOP reconfigResult = 0
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reconfigResultSuccessPerformed reconfigResult = 1
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reconfigResultDenied reconfigResult = 2
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reconfigResultErrorWrongSSN reconfigResult = 3
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reconfigResultErrorRequestAlreadyInProgress reconfigResult = 4
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reconfigResultErrorBadSequenceNumber reconfigResult = 5
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reconfigResultInProgress reconfigResult = 6
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)
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var errReconfigRespParamTooShort = errors.New("reconfig response parameter too short")
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func (t reconfigResult) String() string {
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switch t {
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case reconfigResultSuccessNOP:
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return "0: Success - Nothing to do"
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case reconfigResultSuccessPerformed:
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return "1: Success - Performed"
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case reconfigResultDenied:
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return "2: Denied"
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case reconfigResultErrorWrongSSN:
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return "3: Error - Wrong SSN"
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case reconfigResultErrorRequestAlreadyInProgress:
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return "4: Error - Request already in progress"
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case reconfigResultErrorBadSequenceNumber:
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return "5: Error - Bad Sequence Number"
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case reconfigResultInProgress:
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return "6: In progress"
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default:
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return fmt.Sprintf("Unknown reconfigResult: %d", t)
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}
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}
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func (r *paramReconfigResponse) marshal() ([]byte, error) {
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r.typ = reconfigResp
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r.raw = make([]byte, 8)
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binary.BigEndian.PutUint32(r.raw, r.reconfigResponseSequenceNumber)
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binary.BigEndian.PutUint32(r.raw[4:], uint32(r.result))
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return r.paramHeader.marshal()
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}
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func (r *paramReconfigResponse) unmarshal(raw []byte) (param, error) {
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err := r.paramHeader.unmarshal(raw)
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if err != nil {
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return nil, err
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}
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if len(r.raw) < 8 {
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return nil, errReconfigRespParamTooShort
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}
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r.reconfigResponseSequenceNumber = binary.BigEndian.Uint32(r.raw)
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r.result = reconfigResult(binary.BigEndian.Uint32(r.raw[4:]))
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return r, nil
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}
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