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Diffstat (limited to 'pkg/tcpip/stack/route.go')
-rw-r--r--pkg/tcpip/stack/route.go63
1 files changed, 55 insertions, 8 deletions
diff --git a/pkg/tcpip/stack/route.go b/pkg/tcpip/stack/route.go
index 5c8b7977a..1a0a51b57 100644
--- a/pkg/tcpip/stack/route.go
+++ b/pkg/tcpip/stack/route.go
@@ -47,8 +47,8 @@ type Route struct {
// starts.
ref *referencedNetworkEndpoint
- // loop controls where WritePacket should send packets.
- loop PacketLooping
+ // Loop controls where WritePacket should send packets.
+ Loop PacketLooping
}
// makeRoute initializes a new route. It takes ownership of the provided
@@ -59,6 +59,8 @@ func makeRoute(netProto tcpip.NetworkProtocolNumber, localAddr, remoteAddr tcpip
loop = PacketLoop
} else if multicastLoop && (header.IsV4MulticastAddress(remoteAddr) || header.IsV6MulticastAddress(remoteAddr)) {
loop |= PacketLoop
+ } else if remoteAddr == header.IPv4Broadcast {
+ loop |= PacketLoop
}
return Route{
@@ -67,7 +69,7 @@ func makeRoute(netProto tcpip.NetworkProtocolNumber, localAddr, remoteAddr tcpip
LocalLinkAddress: localLinkAddr,
RemoteAddress: remoteAddr,
ref: ref,
- loop: loop,
+ Loop: loop,
}
}
@@ -152,12 +154,12 @@ func (r *Route) IsResolutionRequired() bool {
}
// WritePacket writes the packet through the given route.
-func (r *Route) WritePacket(gso *GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.TransportProtocolNumber, ttl uint8) *tcpip.Error {
+func (r *Route) WritePacket(gso *GSO, hdr buffer.Prependable, payload buffer.VectorisedView, params NetworkHeaderParams) *tcpip.Error {
if !r.ref.isValidForOutgoing() {
return tcpip.ErrInvalidEndpointState
}
- err := r.ref.ep.WritePacket(r, gso, hdr, payload, protocol, ttl, r.loop)
+ err := r.ref.ep.WritePacket(r, gso, hdr, payload, params, r.Loop)
if err != nil {
r.Stats().IP.OutgoingPacketErrors.Increment()
} else {
@@ -167,6 +169,44 @@ func (r *Route) WritePacket(gso *GSO, hdr buffer.Prependable, payload buffer.Vec
return err
}
+// PacketDescriptor is a packet descriptor which contains a packet header and
+// offset and size of packet data in a payload view.
+type PacketDescriptor struct {
+ Hdr buffer.Prependable
+ Off int
+ Size int
+}
+
+// NewPacketDescriptors allocates a set of packet descriptors.
+func NewPacketDescriptors(n int, hdrSize int) []PacketDescriptor {
+ buf := make([]byte, n*hdrSize)
+ hdrs := make([]PacketDescriptor, n)
+ for i := range hdrs {
+ hdrs[i].Hdr = buffer.NewEmptyPrependableFromView(buf[i*hdrSize:][:hdrSize])
+ }
+ return hdrs
+}
+
+// WritePackets writes the set of packets through the given route.
+func (r *Route) WritePackets(gso *GSO, hdrs []PacketDescriptor, payload buffer.VectorisedView, params NetworkHeaderParams) (int, *tcpip.Error) {
+ if !r.ref.isValidForOutgoing() {
+ return 0, tcpip.ErrInvalidEndpointState
+ }
+
+ n, err := r.ref.ep.WritePackets(r, gso, hdrs, payload, params, r.Loop)
+ if err != nil {
+ r.Stats().IP.OutgoingPacketErrors.IncrementBy(uint64(len(hdrs) - n))
+ }
+ r.ref.nic.stats.Tx.Packets.IncrementBy(uint64(n))
+ payloadSize := 0
+ for i := 0; i < n; i++ {
+ r.ref.nic.stats.Tx.Bytes.IncrementBy(uint64(hdrs[i].Hdr.UsedLength()))
+ payloadSize += hdrs[i].Size
+ }
+ r.ref.nic.stats.Tx.Bytes.IncrementBy(uint64(payloadSize))
+ return n, err
+}
+
// WriteHeaderIncludedPacket writes a packet already containing a network
// header through the given route.
func (r *Route) WriteHeaderIncludedPacket(payload buffer.VectorisedView) *tcpip.Error {
@@ -174,7 +214,7 @@ func (r *Route) WriteHeaderIncludedPacket(payload buffer.VectorisedView) *tcpip.
return tcpip.ErrInvalidEndpointState
}
- if err := r.ref.ep.WriteHeaderIncludedPacket(r, payload, r.loop); err != nil {
+ if err := r.ref.ep.WriteHeaderIncludedPacket(r, payload, r.Loop); err != nil {
r.Stats().IP.OutgoingPacketErrors.Increment()
return err
}
@@ -208,10 +248,17 @@ func (r *Route) Clone() Route {
return *r
}
-// MakeLoopedRoute duplicates the given route and tweaks it in case of multicast.
+// MakeLoopedRoute duplicates the given route with special handling for routes
+// used for sending multicast or broadcast packets. In those cases the
+// multicast/broadcast address is the remote address when sending out, but for
+// incoming (looped) packets it becomes the local address. Similarly, the local
+// interface address that was the local address going out becomes the remote
+// address coming in. This is different to unicast routes where local and
+// remote addresses remain the same as they identify location (local vs remote)
+// not direction (source vs destination).
func (r *Route) MakeLoopedRoute() Route {
l := r.Clone()
- if header.IsV4MulticastAddress(r.RemoteAddress) || header.IsV6MulticastAddress(r.RemoteAddress) {
+ if r.RemoteAddress == header.IPv4Broadcast || header.IsV4MulticastAddress(r.RemoteAddress) || header.IsV6MulticastAddress(r.RemoteAddress) {
l.RemoteAddress, l.LocalAddress = l.LocalAddress, l.RemoteAddress
l.RemoteLinkAddress = l.LocalLinkAddress
}