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

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Message-ID: <20210513043749.GM1047389@frotz.zork.net>
Date:   Wed, 12 May 2021 21:37:49 -0700
From:   Seth David Schoen <schoen@...alty.org>
To:     netdev@...r.kernel.org
Cc:     John Gilmore <gnu@...d.com>, Dave Taht <dave.taht@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>
Subject: [RESEND PATCH net-next 1/2] 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@...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