netdev - [PATCH bpf-next v5 2/9] bpf: xfrm: Add bpf_xdp_xfrm_state

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Date: Mon, 11 Dec 2023 13:20:06 -0700
From: Daniel Xu <dxu@...uu.xyz>
To: daniel@...earbox.net,
	davem@...emloft.net,
	edumazet@...gle.com,
	Herbert Xu <herbert@...dor.apana.org.au>,
	ast@...nel.org,
	john.fastabend@...il.com,
	kuba@...nel.org,
	steffen.klassert@...unet.com,
	pabeni@...hat.com,
	hawk@...nel.org,
	antony.antony@...unet.com,
	alexei.starovoitov@...il.com,
	yonghong.song@...ux.dev,
	eddyz87@...il.com,
	eyal.birger@...il.com
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	devel@...ux-ipsec.org
Subject: [PATCH bpf-next v5 2/9] bpf: xfrm: Add bpf_xdp_xfrm_state_release() kfunc

This kfunc releases a previously acquired xfrm_state from
bpf_xdp_get_xfrm_state().

Co-developed-by: Antony Antony <antony.antony@...unet.com>
Signed-off-by: Antony Antony <antony.antony@...unet.com>
Acked-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 net/xfrm/xfrm_state_bpf.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/net/xfrm/xfrm_state_bpf.c b/net/xfrm/xfrm_state_bpf.c
index 21630974c27d..b84adec4451c 100644
--- a/net/xfrm/xfrm_state_bpf.c
+++ b/net/xfrm/xfrm_state_bpf.c
@@ -96,10 +96,26 @@ bpf_xdp_get_xfrm_state(struct xdp_md *ctx, struct bpf_xfrm_state_opts *opts, u32
 	return x;
 }
 
+/* bpf_xdp_xfrm_state_release - Release acquired xfrm_state object
+ *
+ * This must be invoked for referenced PTR_TO_BTF_ID, and the verifier rejects
+ * the program if any references remain in the program in all of the explored
+ * states.
+ *
+ * Parameters:
+ * @x		- Pointer to referenced xfrm_state object, obtained using
+ *		  bpf_xdp_get_xfrm_state.
+ */
+__bpf_kfunc void bpf_xdp_xfrm_state_release(struct xfrm_state *x)
+{
+	xfrm_state_put(x);
+}
+
 __bpf_kfunc_end_defs();
 
 BTF_SET8_START(xfrm_state_kfunc_set)
 BTF_ID_FLAGS(func, bpf_xdp_get_xfrm_state, KF_RET_NULL | KF_ACQUIRE)
+BTF_ID_FLAGS(func, bpf_xdp_xfrm_state_release, KF_RELEASE)
 BTF_SET8_END(xfrm_state_kfunc_set)
 
 static const struct btf_kfunc_id_set xfrm_state_xdp_kfunc_set = {
-- 
2.42.1