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Remove unused WritePackets helpers

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https://github.com/google/gvisor/commit/fd89c0892ba7ff2c1e1d0bc91e181488f2f4ca8f
dropped the WritePackets family of functions for layers above the
LinkEndpoint.

PiperOrigin-RevId: 417737737
This commit is contained in:
Ghanan Gowripalan
2021-12-21 20:23:46 -08:00
committed by gVisor bot
parent 271e4f4ae6
commit c299f605d3
1 changed files with 0 additions and 50 deletions
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pkg/tcpip/stack/iptables.go
-50
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@@ -572,56 +572,6 @@ func (it *IPTables) startReaper(interval time.Duration) {
}()
}
// CheckOutputPackets performs the output hook on the packets.
//
// Returns a map of packets that must be dropped.
//
// Precondition: The packets' network and transport header must be set.
func (it *IPTables) CheckOutputPackets(pkts PacketBufferList, r *Route, outNicName string) (drop map[*PacketBuffer]struct{}, natPkts map[*PacketBuffer]struct{}) {
return checkPackets(pkts, func(pkt *PacketBuffer) bool {
return it.CheckOutput(pkt, r, outNicName)
}, true /* dnat */)
}
// CheckPostroutingPackets performs the postrouting hook on the packets.
//
// Returns a map of packets that must be dropped.
//
// Precondition: The packets' network and transport header must be set.
func (it *IPTables) CheckPostroutingPackets(pkts PacketBufferList, r *Route, addressEP AddressableEndpoint, outNicName string) (drop map[*PacketBuffer]struct{}, natPkts map[*PacketBuffer]struct{}) {
return checkPackets(pkts, func(pkt *PacketBuffer) bool {
return it.CheckPostrouting(pkt, r, addressEP, outNicName)
}, false /* dnat */)
}
func getAddr(pkt *PacketBuffer, dnat bool) tcpip.Address {
net := pkt.Network()
if dnat {
return net.DestinationAddress()
}
return net.SourceAddress()
}
func checkPackets(pkts PacketBufferList, f func(*PacketBuffer) bool, dnat bool) (drop map[*PacketBuffer]struct{}, natPkts map[*PacketBuffer]struct{}) {
for pkt := pkts.Front(); pkt != nil; pkt = pkt.Next() {
origAddr := getAddr(pkt, dnat)
if ok := f(pkt); !ok {
if drop == nil {
drop = make(map[*PacketBuffer]struct{})
}
drop[pkt] = struct{}{}
}
if newAddr := getAddr(pkt, dnat); newAddr != origAddr {
if natPkts == nil {
natPkts = make(map[*PacketBuffer]struct{})
}
natPkts[pkt] = struct{}{}
}
}
return drop, natPkts
}
// Preconditions:
// * pkt is a IPv4 packet of at least length header.IPv4MinimumSize.
// * pkt.NetworkHeader is not nil.