Date: Fri, 30 Oct 2020 13:32:59 +0000 (UTC) From: Mitchell Horne <mhorne@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r367163 - head/sys/net Message-ID: <202010301332.09UDWxBQ041814@repo.freebsd.org>
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Author: mhorne Date: Fri Oct 30 13:32:58 2020 New Revision: 367163 URL: https://svnweb.freebsd.org/changeset/base/367163 Log: net: add ETHER_IS_IPV6_MULTICAST This can be used to detect if an ethernet address is specifically an IPv6 multicast address, defined in accordance to RFC 2464. ETHER_IS_MULTICAST is still preferred in the general case. Reviewed by: ae Sponsored by: NetApp, Inc. Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D26611 Modified: head/sys/net/ethernet.h Modified: head/sys/net/ethernet.h ============================================================================== --- head/sys/net/ethernet.h Fri Oct 30 10:46:35 2020 (r367162) +++ head/sys/net/ethernet.h Fri Oct 30 13:32:58 2020 (r367163) @@ -71,6 +71,8 @@ struct ether_addr { } __packed; #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ +#define ETHER_IS_IPV6_MULTICAST(addr) \ + (((addr)[0] == 0x33) && ((addr)[1] == 0x33)) #define ETHER_IS_BROADCAST(addr) \ (((addr)[0] & (addr)[1] & (addr)[2] & \ (addr)[3] & (addr)[4] & (addr)[5]) == 0xff)
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