From eb37a96d185646e964836cde0962637edadfcf9d Mon Sep 17 00:00:00 2001 From: Seth David Schoen Date: Thu, 16 May 2024 14:44:22 +0800 Subject: [PATCH] ip: Treat IPv4 segment's lowest address as unicast mainline inclusion from mainline-v5.14-rc1 commit 94c821c74bf5fe0c25e09df5334a16f98608db90 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I65HYE Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=94c821c74bf5fe0c25e09df5334a16f98608db90 --------------------------- Treat only the highest, not the lowest, IPv4 address within a local subnet as a broadcast address. Signed-off-by: Seth David Schoen Suggested-by: John Gilmore Acked-by: Dave Taht Reviewed-by: David Ahern Signed-off-by: David S. Miller Conflicts: net/ipv4/fib_frontend.c [There is no conflict when cherry-picking. But we backport newer commit 0c51e12e218f2 causing the checkconflict CI fail.] Signed-off-by: Liu Jian --- 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 41f890bf9d4c..efe143885995 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -1132,10 +1132,8 @@ 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); arp_invalidate(dev, prefix | ~mask, false); -- Gitee