diff options
Diffstat (limited to 'pkg/tcpip/network/ipv6')
| -rw-r--r-- | pkg/tcpip/network/ipv6/ipv6.go | 86 |
1 files changed, 75 insertions, 11 deletions
diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go index a703a768c..685239017 100644 --- a/pkg/tcpip/network/ipv6/ipv6.go +++ b/pkg/tcpip/network/ipv6/ipv6.go @@ -184,24 +184,61 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt stack.PacketBuffer) { pkt.Data.TrimFront(header.IPv6MinimumSize) pkt.Data.CapLength(int(h.PayloadLength())) - it, err := header.MakeIPv6PayloadIterator(header.IPv6ExtensionHeaderIdentifier(h.NextHeader()), pkt.Data, true) - if err != nil { - r.Stats().IP.MalformedPacketsReceived.Increment() - return - } + it := header.MakeIPv6PayloadIterator(header.IPv6ExtensionHeaderIdentifier(h.NextHeader()), pkt.Data) - for { + for firstHeader := true; ; firstHeader = false { extHdr, done, err := it.Next() if err != nil { - // This should never happen as MakeIPv6PayloadIterator above did not - // return an error. - panic(fmt.Sprintf("unexpected error when iterating over IPv6 payload: %s", err)) + r.Stats().IP.MalformedPacketsReceived.Increment() + return } if done { break } switch extHdr := extHdr.(type) { + case header.IPv6HopByHopOptionsExtHdr: + // As per RFC 8200 section 4.1, the Hop By Hop extension header is + // restricted to appear immediately after an IPv6 fixed header. + // + // TODO(b/152019344): Send an ICMPv6 Parameter Problem, Code 1 + // (unrecognized next header) error in response to an extension header's + // Next Header field with the Hop By Hop extension header identifier. + if !firstHeader { + return + } + + optsIt := extHdr.Iter() + + for { + opt, done, err := optsIt.Next() + if err != nil { + r.Stats().IP.MalformedPacketsReceived.Increment() + return + } + if done { + break + } + + // We currently do not support any IPv6 Hop By Hop extension header + // options. + switch opt.UnknownAction() { + case header.IPv6OptionUnknownActionSkip: + case header.IPv6OptionUnknownActionDiscard: + return + case header.IPv6OptionUnknownActionDiscardSendICMP: + // TODO(b/152019344): Send an ICMPv6 Parameter Problem Code 2 for + // unrecognized IPv6 extension header options. + return + case header.IPv6OptionUnknownActionDiscardSendICMPNoMulticastDest: + // TODO(b/152019344): Send an ICMPv6 Parameter Problem Code 2 for + // unrecognized IPv6 extension header options. + return + default: + panic(fmt.Sprintf("unrecognized action for an unrecognized Hop By Hop extension header option = %d", opt)) + } + } + case header.IPv6RoutingExtHdr: // As per RFC 8200 section 4.4, if a node encounters a routing header with // an unrecognized routing type value, with a non-zero Segments Left @@ -266,12 +303,39 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt stack.PacketBuffer) { // We create a new iterator with the reassembled packet because we could // have more extension headers in the reassembled payload, as per RFC // 8200 section 4.5. - it, err = header.MakeIPv6PayloadIterator(rawPayload.Identifier, pkt.Data, true) + it = header.MakeIPv6PayloadIterator(rawPayload.Identifier, pkt.Data) + } + + case header.IPv6DestinationOptionsExtHdr: + optsIt := extHdr.Iter() + + for { + opt, done, err := optsIt.Next() if err != nil { r.Stats().IP.MalformedPacketsReceived.Increment() - r.Stats().IP.MalformedFragmentsReceived.Increment() return } + if done { + break + } + + // We currently do not support any IPv6 Destination extension header + // options. + switch opt.UnknownAction() { + case header.IPv6OptionUnknownActionSkip: + case header.IPv6OptionUnknownActionDiscard: + return + case header.IPv6OptionUnknownActionDiscardSendICMP: + // TODO(b/152019344): Send an ICMPv6 Parameter Problem Code 2 for + // unrecognized IPv6 extension header options. + return + case header.IPv6OptionUnknownActionDiscardSendICMPNoMulticastDest: + // TODO(b/152019344): Send an ICMPv6 Parameter Problem Code 2 for + // unrecognized IPv6 extension header options. + return + default: + panic(fmt.Sprintf("unrecognized action for an unrecognized Destination extension header option = %d", opt)) + } } case header.IPv6RawPayloadHeader: |