diff options
Diffstat (limited to 'pkg/tcpip/header/igmp.go')
| -rw-r--r-- | pkg/tcpip/header/igmp.go | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/pkg/tcpip/header/igmp.go b/pkg/tcpip/header/igmp.go index e0f5d46f4..5c5be1b9d 100644 --- a/pkg/tcpip/header/igmp.go +++ b/pkg/tcpip/header/igmp.go @@ -17,6 +17,7 @@ package header import ( "encoding/binary" "fmt" + "time" "gvisor.dev/gvisor/pkg/tcpip" ) @@ -103,7 +104,15 @@ func (b IGMP) SetType(t IGMPType) { b[igmpTypeOffset] = byte(t) } // MaxRespTime gets the MaxRespTimeField. This is meaningful only in Membership // Query messages, in other cases it is set to 0 by the sender and ignored by // the receiver. -func (b IGMP) MaxRespTime() byte { return b[igmpMaxRespTimeOffset] } +func (b IGMP) MaxRespTime() time.Duration { + // As per RFC 2236 section 2.2, + // + // The Max Response Time field is meaningful only in Membership Query + // messages, and specifies the maximum allowed time before sending a + // responding report in units of 1/10 second. In all other messages, it + // is set to zero by the sender and ignored by receivers. + return DecisecondToDuration(b[igmpMaxRespTimeOffset]) +} // SetMaxRespTime sets the MaxRespTimeField. func (b IGMP) SetMaxRespTime(m byte) { b[igmpMaxRespTimeOffset] = m } @@ -164,3 +173,9 @@ func IGMPCalculateChecksum(h IGMP) uint16 { h.SetChecksum(existingXsum) return xsum } + +// DecisecondToDuration converts a value representing deci-seconds to a +// time.Duration. +func DecisecondToDuration(ds uint8) time.Duration { + return time.Duration(ds) * time.Second / 10 +} |