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[RFCv2,bpf-next,2/7] bpf: xfrm: Add bpf_xdp_xfrm_state_release() kfunc

Message ID 9f43e62bedf3aa0a230db607fee8bd650ab84649.1698875025.git.dxu@dxuuu.xyz (mailing list archive)
State RFC
Delegated to: BPF
Headers show
Series Add bpf_xdp_get_xfrm_state() kfunc | expand

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Commit Message

Daniel Xu Nov. 1, 2023, 9:57 p.m. UTC 
This kfunc releases a previously acquired xfrm_state from
bpf_xdp_get_xfrm_state().

Co-developed-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
---
 net/xfrm/xfrm_state_bpf.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/net/xfrm/xfrm_state_bpf.c b/net/xfrm/xfrm_state_bpf.c
index 4aaac134b97a..386167c86767 100644
--- a/net/xfrm/xfrm_state_bpf.c
+++ b/net/xfrm/xfrm_state_bpf.c
@@ -87,10 +87,26 @@  bpf_xdp_get_xfrm_state(struct xdp_md *ctx, struct bpf_xfrm_state_opts *opts, u32
 				 opts->proto, opts->family);
 }
 
+/* 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 = {