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ip: Treat IPv4 segment's lowest address as unicast 

Treat only the highest, not the lowest, IPv4 address within a local
subnet as a broadcast address.

Signed-off-by: Seth David Schoen <schoen@loyalty.org>
Suggested-by: John Gilmore <gnu@toad.com>
Acked-by: Dave Taht <dave.taht@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Seth David Schoen 2021-05-12 21:37:49 -07:00 committed by David S. Miller
parent 77091933e4
commit 94c821c74b
1 changed files with 1 additions and 3 deletions
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4
net/ipv4/fib_frontend.c
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@ -1122,10 +1122,8 @@ void fib_add_ifaddr(struct in_ifaddr *ifa)
prefix, ifa->ifa_prefixlen, prim,
ifa->ifa_rt_priority);
/* Add network specific broadcasts, when it takes a sense */
/* Add the network broadcast address, when it makes sense */
if (ifa->ifa_prefixlen < 31) {
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32,
prim, 0);
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
32, prim, 0);
}