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| author | Seth David Schoen <schoen@loyalty.org> | 2023-01-02 20:42:50 -0800 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2023-01-04 00:48:15 +0100 |
| commit | 68f983ba4102faac55211c6c6e799641ed3e3da6 (patch) | |
| tree | 360e87733d9232c857e38f933344069c7c52c5fe | |
| parent | 738b04c88128d9963b81bff68426980f587f22d9 (diff) | |
| download | upstream-68f983ba4102faac55211c6c6e799641ed3e3da6.tar.gz upstream-68f983ba4102faac55211c6c6e799641ed3e3da6.tar.bz2 upstream-68f983ba4102faac55211c6c6e799641ed3e3da6.zip | |
generic: 5.10: backport Treat IPv4 segment's lowest address as unicast
Backport patch from kernel 5.14.
Treat only the highest, not the lowest, IPv4 address within a local
subnet as a broadcast address, as subnets do not need two different
broadcast addresses and networking documentation consistently prefers
the highest address as broadcast.
This patch was merged in upstream net-next tree in May 2021 at
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=94c821c74bf5
This eventually frees up one address per subnet. It matches behavior
suggested in our Internet-Draft, and also the default behavior of OpenBSD
and FreeBSD.
Signed-off-by: Seth David Schoen <schoen@loyalty.org>
| -rw-r--r-- | target/linux/generic/backport-5.10/615-v5.14-ip-Treat-IPv4-segment-s-lowest-address-as-unicast.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/615-v5.14-ip-Treat-IPv4-segment-s-lowest-address-as-unicast.patch b/target/linux/generic/backport-5.10/615-v5.14-ip-Treat-IPv4-segment-s-lowest-address-as-unicast.patch new file mode 100644 index 0000000000..8aabbe2859 --- /dev/null +++ b/target/linux/generic/backport-5.10/615-v5.14-ip-Treat-IPv4-segment-s-lowest-address-as-unicast.patch @@ -0,0 +1,32 @@ +From 94c821c74bf5fe0c25e09df5334a16f98608db90 Mon Sep 17 00:00:00 2001 +From: Seth David Schoen <schoen@loyalty.org> +Date: Wed, 12 May 2021 21:37:49 -0700 +Subject: [PATCH] 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> +Link: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=94c821c74bf5 +--- + net/ipv4/fib_frontend.c | 4 +--- + 1 file changed, 1 insertion(+), 3 deletions(-) + +--- a/net/ipv4/fib_frontend.c ++++ b/net/ipv4/fib_frontend.c +@@ -1129,10 +1129,8 @@ void fib_add_ifaddr(struct in_ifaddr *if + 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); |