github.com/Andyfoo/golang/x/net@v0.0.0-20190901054642-57c1bf301704/ipv6/genericopt.go (about)

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package ipv6
     6  
     7  // TrafficClass returns the traffic class field value for outgoing
     8  // packets.
     9  func (c *genericOpt) TrafficClass() (int, error) {
    10  	if !c.ok() {
    11  		return 0, errInvalidConn
    12  	}
    13  	so, ok := sockOpts[ssoTrafficClass]
    14  	if !ok {
    15  		return 0, errNotImplemented
    16  	}
    17  	return so.GetInt(c.Conn)
    18  }
    19  
    20  // SetTrafficClass sets the traffic class field value for future
    21  // outgoing packets.
    22  func (c *genericOpt) SetTrafficClass(tclass int) error {
    23  	if !c.ok() {
    24  		return errInvalidConn
    25  	}
    26  	so, ok := sockOpts[ssoTrafficClass]
    27  	if !ok {
    28  		return errNotImplemented
    29  	}
    30  	return so.SetInt(c.Conn, tclass)
    31  }
    32  
    33  // HopLimit returns the hop limit field value for outgoing packets.
    34  func (c *genericOpt) HopLimit() (int, error) {
    35  	if !c.ok() {
    36  		return 0, errInvalidConn
    37  	}
    38  	so, ok := sockOpts[ssoHopLimit]
    39  	if !ok {
    40  		return 0, errNotImplemented
    41  	}
    42  	return so.GetInt(c.Conn)
    43  }
    44  
    45  // SetHopLimit sets the hop limit field value for future outgoing
    46  // packets.
    47  func (c *genericOpt) SetHopLimit(hoplim int) error {
    48  	if !c.ok() {
    49  		return errInvalidConn
    50  	}
    51  	so, ok := sockOpts[ssoHopLimit]
    52  	if !ok {
    53  		return errNotImplemented
    54  	}
    55  	return so.SetInt(c.Conn, hoplim)
    56  }