diff options
Diffstat (limited to 'freebsd/sys/net/if_ethersubr.c')
| -rw-r--r-- | freebsd/sys/net/if_ethersubr.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/freebsd/sys/net/if_ethersubr.c b/freebsd/sys/net/if_ethersubr.c index 01e757e5..96ed309a 100644 --- a/freebsd/sys/net/if_ethersubr.c +++ b/freebsd/sys/net/if_ethersubr.c @@ -477,6 +477,26 @@ ether_output_frame(struct ifnet *ifp, struct mbuf *m) return (0); } +#ifdef EXPERIMENTAL +#if defined(INET6) && defined(INET) + /* draft-ietf-6man-ipv6only-flag */ + /* Catch ETHERTYPE_IP, and ETHERTYPE_ARP if we are v6-only. */ + if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY) != 0) { + struct ether_header *eh; + + eh = mtod(m, struct ether_header *); + switch (ntohs(eh->ether_type)) { + case ETHERTYPE_IP: + case ETHERTYPE_ARP: + m_freem(m); + return (EAFNOSUPPORT); + /* NOTREACHED */ + break; + }; + } +#endif +#endif + /* * Queue message on interface, update output statistics if * successful, and start output if interface not yet active. |