linux-kernel - [PATCH bpf v1 1/2] bpf: fix link info netfilter flags to populate defrag flag

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Message-ID: <20241011193252.178997-1-wudevelops@gmail.com>
Date: Fri, 11 Oct 2024 19:32:51 +0000
From: Tyrone Wu <wudevelops@...il.com>
To: bpf@...r.kernel.org,
	wudevelops@...il.com
Cc: pablo@...filter.org,
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Subject: [PATCH bpf v1 1/2] bpf: fix link info netfilter flags to populate defrag flag

This patch correctly populates the `bpf_link_info.netfilter.flags` field
when user passes the `BPF_F_NETFILTER_IP_DEFRAG` flag.

Fixes: 84601d6ee68a ("bpf: add bpf_link support for BPF_NETFILTER programs")
Signed-off-by: Tyrone Wu <wudevelops@...il.com>
---
 net/netfilter/nf_bpf_link.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nf_bpf_link.c b/net/netfilter/nf_bpf_link.c
index 5257d5e7eb09..797fe8a9971e 100644
--- a/net/netfilter/nf_bpf_link.c
+++ b/net/netfilter/nf_bpf_link.c
@@ -150,11 +150,12 @@ static int bpf_nf_link_fill_link_info(const struct bpf_link *link,
 				      struct bpf_link_info *info)
 {
 	struct bpf_nf_link *nf_link = container_of(link, struct bpf_nf_link, link);
+	const struct nf_defrag_hook *hook = nf_link->defrag_hook;
 
 	info->netfilter.pf = nf_link->hook_ops.pf;
 	info->netfilter.hooknum = nf_link->hook_ops.hooknum;
 	info->netfilter.priority = nf_link->hook_ops.priority;
-	info->netfilter.flags = 0;
+	info->netfilter.flags = hook ? BPF_F_NETFILTER_IP_DEFRAG : 0;
 
 	return 0;
 }
-- 
2.43.0