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ethernet: Add helpers to recognize addresses mapped to IP multicast

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IP multicast must sometimes be discriminated from non-IP multicast,
e.g. when determining the forwarding behavior of a given group in the
presence of multicast router ports on an offloaded bridge. Therefore,
provide helpers to identify these groups.

Signed-off-by: Casper Andersson <casper.casan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Casper Andersson 2022-08-25 11:28:35 +02:00 committed by David S. Miller
parent 9c5d03d362
commit e8013f8eda
1 changed files with 22 additions and 0 deletions
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22
include/linux/etherdevice.h
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@ -428,6 +428,28 @@ static inline bool ether_addr_equal_masked(const u8 *addr1, const u8 *addr2,
return true;
}
static inline bool ether_addr_is_ipv4_mcast(const u8 *addr)
{
u8 base[ETH_ALEN] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
u8 mask[ETH_ALEN] = { 0xff, 0xff, 0xff, 0x80, 0x00, 0x00 };
return ether_addr_equal_masked(addr, base, mask);
}
static inline bool ether_addr_is_ipv6_mcast(const u8 *addr)
{
u8 base[ETH_ALEN] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
u8 mask[ETH_ALEN] = { 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 };
return ether_addr_equal_masked(addr, base, mask);
}
static inline bool ether_addr_is_ip_mcast(const u8 *addr)
{
return ether_addr_is_ipv4_mcast(addr) ||
ether_addr_is_ipv6_mcast(addr);
}
/**
* ether_addr_to_u64 - Convert an Ethernet address into a u64 value.
* @addr: Pointer to a six-byte array containing the Ethernet address