netdev - [PATCH net-next 1/2] ip: Treat IPv4 segment's lowest address as unicast

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Date:   Fri, 19 Mar 2021 17:02:21 -0700
From:   Seth David Schoen <schoen@...alty.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, gnu@...d.com,
        dave.taht@...il.com
Subject: [PATCH net-next 1/2] ip: Treat IPv4 segment's lowest address as
 unicast

Treat the lowest-numbered address in each IPv4 network
segment as unicast, not broadcast.

Signed-off-by: Seth David Schoen <schoen@...alty.org>
Suggested-by: John Gilmore <gnu@...d.com>
Acked-by: Dave Taht <dave.taht@...il.com>
---
 net/ipv4/fib_frontend.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 84bb707bd88d..bfb345c88271 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -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);
 		}
-- 
2.25.1