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authorGhanan Gowripalan <ghanan@google.com>2020-10-16 10:40:35 -0700
committergVisor bot <gvisor-bot@google.com>2020-10-16 10:42:34 -0700
commitfbfcf8144c1f3deafe13dd3ed6afdb4de0b7c1fd (patch)
tree8cb6d4cfaf7bb34cc99942830e5381ec5f9c05c5 /pkg/tcpip/network/ipv6
parent14a003c60f35e55f9e8c29fc0d75478c9a1214f9 (diff)
Enable IPv6 WriteHeaderIncludedPacket
Allow writing an IPv6 packet where the IPv6 header is a provided by the user. * Introduce an error to let callers know a header is malformed. We previously useed tcpip.ErrInvalidOptionValue but that did not seem appropriate for generic malformed header errors. * Populate network header in WriteHeaderIncludedPacket IPv4's implementation of WriteHeaderIncludedPacket did not previously populate the packet buffer's network header. This change fixes that. Fixes #4527 Test: ip_test.TestWriteHeaderIncludedPacket PiperOrigin-RevId: 337534548
Diffstat (limited to 'pkg/tcpip/network/ipv6')
-rw-r--r--pkg/tcpip/network/ipv6/ipv6.go44
1 files changed, 38 insertions, 6 deletions
diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go
index 2bd8f4ece..632914dd6 100644
--- a/pkg/tcpip/network/ipv6/ipv6.go
+++ b/pkg/tcpip/network/ipv6/ipv6.go
@@ -426,7 +426,10 @@ func (e *endpoint) handleFragments(r *stack.Route, gso *stack.GSO, mtu uint32, p
// WritePacket writes a packet to the given destination address and protocol.
func (e *endpoint) WritePacket(r *stack.Route, gso *stack.GSO, params stack.NetworkHeaderParams, pkt *stack.PacketBuffer) *tcpip.Error {
e.addIPHeader(r, pkt, params)
+ return e.writePacket(r, gso, pkt, params.Protocol)
+}
+func (e *endpoint) writePacket(r *stack.Route, gso *stack.GSO, pkt *stack.PacketBuffer, protocol tcpip.TransportProtocolNumber) *tcpip.Error {
// iptables filtering. All packets that reach here are locally
// generated.
nicName := e.protocol.stack.FindNICNameFromID(e.nic.ID())
@@ -468,7 +471,7 @@ func (e *endpoint) WritePacket(r *stack.Route, gso *stack.GSO, params stack.Netw
}
if e.packetMustBeFragmented(pkt, gso) {
- sent, remain, err := e.handleFragments(r, gso, e.nic.MTU(), pkt, params.Protocol, func(fragPkt *stack.PacketBuffer) *tcpip.Error {
+ sent, remain, err := e.handleFragments(r, gso, e.nic.MTU(), pkt, protocol, func(fragPkt *stack.PacketBuffer) *tcpip.Error {
// TODO(gvisor.dev/issue/3884): Evaluate whether we want to send each
// fragment one by one using WritePacket() (current strategy) or if we
// want to create a PacketBufferList from the fragments and feed it to
@@ -569,11 +572,40 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.Packe
return n + len(dropped), nil
}
-// WriteHeaderIncludedPacker implements stack.NetworkEndpoint. It is not yet
-// supported by IPv6.
-func (*endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt *stack.PacketBuffer) *tcpip.Error {
- // TODO(b/146666412): Support IPv6 header-included packets.
- return tcpip.ErrNotSupported
+// WriteHeaderIncludedPacker implements stack.NetworkEndpoint.
+func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt *stack.PacketBuffer) *tcpip.Error {
+ // The packet already has an IP header, but there are a few required checks.
+ h, ok := pkt.Data.PullUp(header.IPv6MinimumSize)
+ if !ok {
+ return tcpip.ErrMalformedHeader
+ }
+ ip := header.IPv6(h)
+
+ // Always set the payload length.
+ pktSize := pkt.Data.Size()
+ ip.SetPayloadLength(uint16(pktSize - header.IPv6MinimumSize))
+
+ // Set the source address when zero.
+ if ip.SourceAddress() == header.IPv6Any {
+ ip.SetSourceAddress(r.LocalAddress)
+ }
+
+ // Set the destination. If the packet already included a destination, it will
+ // be part of the route anyways.
+ ip.SetDestinationAddress(r.RemoteAddress)
+
+ // Populate the packet buffer's network header and don't allow an invalid
+ // packet to be sent.
+ //
+ // Note that parsing only makes sure that the packet is well formed as per the
+ // wire format. We also want to check if the header's fields are valid before
+ // sending the packet.
+ proto, _, _, _, ok := parse.IPv6(pkt)
+ if !ok || !header.IPv6(pkt.NetworkHeader().View()).IsValid(pktSize) {
+ return tcpip.ErrMalformedHeader
+ }
+
+ return e.writePacket(r, nil /* gso */, pkt, proto)
}
// HandlePacket is called by the link layer when new ipv6 packets arrive for