* [RFC net-next 05/15] netlink: add macro for checking dump ctx size
[not found] <20221215020155.1619839-1-kuba@kernel.org>
@ 2022-12-15 2:01 ` Jakub Kicinski
0 siblings, 0 replies; only message in thread
From: Jakub Kicinski @ 2022-12-15 2:01 UTC (permalink / raw)
To: davem
Cc: netdev, edumazet, pabeni, jiri, jacob.e.keller, leon,
Jakub Kicinski, pablo, kadlec, fw, johannes, ecree.xilinx,
netfilter-devel, coreteam
We encourage casting struct netlink_callback::ctx to a local
struct (in a comment above the field). Provide a convenience
macro for checking if the local struct fits into the ctx.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
CC: pablo@netfilter.org
CC: kadlec@netfilter.org
CC: fw@strlen.de
CC: johannes@sipsolutions.net
CC: ecree.xilinx@gmail.com
CC: netfilter-devel@vger.kernel.org
CC: coreteam@netfilter.org
---
include/linux/netlink.h | 4 ++++
net/netfilter/nf_conntrack_netlink.c | 2 +-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index d81bde5a5844..38f6334f408c 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -263,6 +263,10 @@ struct netlink_callback {
};
};
+#define NL_ASSET_DUMP_CTX_FITS(type_name) \
+ BUILD_BUG_ON(sizeof(type_name) > \
+ sizeof_field(struct netlink_callback, ctx))
+
struct netlink_notify {
struct net *net;
u32 portid;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 1286ae7d4609..90672e293e57 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -3866,7 +3866,7 @@ static int __init ctnetlink_init(void)
{
int ret;
- BUILD_BUG_ON(sizeof(struct ctnetlink_list_dump_ctx) > sizeof_field(struct netlink_callback, ctx));
+ NL_ASSET_DUMP_CTX_FITS(struct ctnetlink_list_dump_ctx);
ret = nfnetlink_subsys_register(&ctnl_subsys);
if (ret < 0) {
--
2.38.1
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