linux-kernel - [PATCH ipsec-next v1 2/7] bpf: xfrm: Add bpf_xdp_xfrm_state

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Message-ID: <c52cc759c663f51d5e8b755f555dc02d84917a7c.1700676682.git.dxu@dxuuu.xyz>
Date:   Wed, 22 Nov 2023 11:20:23 -0700
From:   Daniel Xu <dxu@...uu.xyz>
To:     john.fastabend@...il.com, Herbert Xu <herbert@...dor.apana.org.au>,
        davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        pabeni@...hat.com, hawk@...nel.org, kuba@...nel.org,
        edumazet@...gle.com, steffen.klassert@...unet.com,
        antony.antony@...unet.com, alexei.starovoitov@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, devel@...ux-ipsec.org
Subject: [PATCH ipsec-next v1 2/7] 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>
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 0c1f2f91125c..33d1b00fedbd 100644
--- a/net/xfrm/xfrm_state_bpf.c
+++ b/net/xfrm/xfrm_state_bpf.c
@@ -93,10 +93,26 @@ 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);
+}
+
 __diag_pop()
 
 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