diff options
| author | Peter Johnston <peterjohnston@google.com> | 2020-10-06 16:15:45 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-10-06 16:17:24 -0700 |
| commit | 95cac27d0d1ca93610f1bea554e3eb67c8a907d7 (patch) | |
| tree | a7a8906aa60898ae3a30e660730c3447b7b99a4d /pkg/tcpip/header/ipv6.go | |
| parent | 99bf022c2aeff35e48d9201406f85f501405c083 (diff) | |
Discard invalid Neighbor Solicitations
...per RFC 4861 s7.1.1.
PiperOrigin-RevId: 335742851
Diffstat (limited to 'pkg/tcpip/header/ipv6.go')
| -rw-r--r-- | pkg/tcpip/header/ipv6.go | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/pkg/tcpip/header/ipv6.go b/pkg/tcpip/header/ipv6.go index ef454b313..c5d8a3456 100644 --- a/pkg/tcpip/header/ipv6.go +++ b/pkg/tcpip/header/ipv6.go @@ -309,14 +309,21 @@ func IsV6UnicastAddress(addr tcpip.Address) bool { return addr[0] != 0xff } +const solicitedNodeMulticastPrefix = "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xff" + // SolicitedNodeAddr computes the solicited-node multicast address. This is // used for NDP. Described in RFC 4291. The argument must be a full-length IPv6 // address. func SolicitedNodeAddr(addr tcpip.Address) tcpip.Address { - const solicitedNodeMulticastPrefix = "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xff" return solicitedNodeMulticastPrefix + addr[len(addr)-3:] } +// IsSolicitedNodeAddr determines whether the address is a solicited-node +// multicast address. +func IsSolicitedNodeAddr(addr tcpip.Address) bool { + return solicitedNodeMulticastPrefix == addr[:len(addr)-3] +} + // EthernetAdddressToModifiedEUI64IntoBuf populates buf with a modified EUI-64 // from a 48-bit Ethernet/MAC address, as per RFC 4291 section 2.5.1. // |