From: Seth David Schoen schoen@loyalty.org

mainline inclusion from mainline-v5.14-rc1 commit 94c821c74bf5fe0c25e09df5334a16f98608db90 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9PX8J

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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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

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 liujian56@huawei.com --- v1->v2: update bugzilla 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);