From 9a6964e419c0a533e1ca5d224221e440093a9e5f Mon Sep 17 00:00:00 2001 From: Sean Edmond Date: Mon, 24 Mar 2025 13:48:45 -0700 Subject: net: dhcp6: Send DHCPv6 using multicast MAC In IPv6, the broadcast MAC address is not used. Instead, it should use the multicast address (see RFC RFC2464). Add IPV6_ALL_NODE_ETH_ADDR macro for clarity. Signed-off-by: Sean Edmond Reviewed-by: Jerome Forissier --- include/net6.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include') diff --git a/include/net6.h b/include/net6.h index 1ed989e584a..2ceeaba0639 100644 --- a/include/net6.h +++ b/include/net6.h @@ -90,6 +90,16 @@ struct udp_hdr { 0x00, 0x00, 0x00, 0x00, \ 0x00, 0x00, 0x00, 0x00, \ 0x00, 0x00, 0x00, 0x02 } } } +/* + * With IPv6, the broadcast MAC address is not used. Instead, it should use + * the multicast address (see RFC RFC2464 section 7) + */ +#define IPV6_ALL_NODE_ETH_ADDR(_ip6_addr) {0x33, \ + 0x33, \ + _ip6_addr.in6_u.u6_addr8[12], \ + _ip6_addr.in6_u.u6_addr8[13], \ + _ip6_addr.in6_u.u6_addr8[14], \ + _ip6_addr.in6_u.u6_addr8[15]} #define IPV6_LINK_LOCAL_PREFIX 0xfe80 #define IPV6_LINK_LOCAL_MASK 0xffb0 /* The first 10-bit of address mask. */ -- cgit v1.3.1