6.17-stable review patch. If anyone has any objections, please let me know.
------------------
From: Asbjørn Sloth Tønnesen ast@fiberby.net
[ Upstream commit 9f9581ba74a931843c6d807ecfeaff9fb8c1b731 ]
While updating the binary min-len implementation, I noticed that the only user, should AFAICT be using exact-len instead.
In net/ipv4/fou_core.c FOU_ATTR_LOCAL_V6 and FOU_ATTR_PEER_V6 are only used for singular IPv6 addresses, and there are AFAICT no known implementations trying to send more, it therefore appears safe to change it to an exact-len policy.
This patch therefore changes the local-v6/peer-v6 attributes to use an exact-len check, instead of a min-len check.
Signed-off-by: Asbjørn Sloth Tønnesen ast@fiberby.net Reviewed-by: Donald Hunter donald.hunter@gmail.com Link: https://patch.msgid.link/20250902154640.759815-2-ast@fiberby.net Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- Documentation/netlink/specs/fou.yaml | 4 ++-- net/ipv4/fou_nl.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/Documentation/netlink/specs/fou.yaml b/Documentation/netlink/specs/fou.yaml index 57735726262ec..8e7974ec453fc 100644 --- a/Documentation/netlink/specs/fou.yaml +++ b/Documentation/netlink/specs/fou.yaml @@ -52,7 +52,7 @@ attribute-sets: name: local-v6 type: binary checks: - min-len: 16 + exact-len: 16 - name: peer-v4 type: u32 @@ -60,7 +60,7 @@ attribute-sets: name: peer-v6 type: binary checks: - min-len: 16 + exact-len: 16 - name: peer-port type: u16 diff --git a/net/ipv4/fou_nl.c b/net/ipv4/fou_nl.c index 3d9614609b2d3..506260b4a4dc2 100644 --- a/net/ipv4/fou_nl.c +++ b/net/ipv4/fou_nl.c @@ -18,9 +18,9 @@ const struct nla_policy fou_nl_policy[FOU_ATTR_IFINDEX + 1] = { [FOU_ATTR_TYPE] = { .type = NLA_U8, }, [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, [FOU_ATTR_LOCAL_V4] = { .type = NLA_U32, }, - [FOU_ATTR_LOCAL_V6] = { .len = 16, }, + [FOU_ATTR_LOCAL_V6] = NLA_POLICY_EXACT_LEN(16), [FOU_ATTR_PEER_V4] = { .type = NLA_U32, }, - [FOU_ATTR_PEER_V6] = { .len = 16, }, + [FOU_ATTR_PEER_V6] = NLA_POLICY_EXACT_LEN(16), [FOU_ATTR_PEER_PORT] = { .type = NLA_BE16, }, [FOU_ATTR_IFINDEX] = { .type = NLA_S32, }, };