diff options
Diffstat (limited to 'sys/netinet/if_ether.h')
| -rw-r--r-- | sys/netinet/if_ether.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/sys/netinet/if_ether.h b/sys/netinet/if_ether.h index 79f1252..09caa31 100644 --- a/sys/netinet/if_ether.h +++ b/sys/netinet/if_ether.h @@ -56,6 +56,22 @@ (enaddr)[4] = ((u_char *)ipaddr)[2]; \ (enaddr)[5] = ((u_char *)ipaddr)[3]; \ } +/* + * Macro to map an IP6 multicast address to an Ethernet multicast address. + * The high-order 16 bits of the Ethernet address are statically assigned, + * and the low-order 32 bits are taken from the low end of the IP6 address. + */ +#define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \ +/* struct in6_addr *ip6addr; */ \ +/* u_char enaddr[ETHER_ADDR_LEN]; */ \ +{ \ + (enaddr)[0] = 0x33; \ + (enaddr)[1] = 0x33; \ + (enaddr)[2] = ((u_char *)ip6addr)[12]; \ + (enaddr)[3] = ((u_char *)ip6addr)[13]; \ + (enaddr)[4] = ((u_char *)ip6addr)[14]; \ + (enaddr)[5] = ((u_char *)ip6addr)[15]; \ +} /* * Ethernet Address Resolution Protocol. |
