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-rw-r--r--tools/include/uapi/linux/bpf.h20
1 files changed, 19 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index a2fb333290dc..852dc17ab47a 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2240,6 +2240,23 @@ union bpf_attr {
* pointer that was returned from bpf_sk_lookup_xxx\ ().
* Return
* 0 on success, or a negative error in case of failure.
+ *
+ * int bpf_msg_push_data(struct sk_buff *skb, u32 start, u32 len, u64 flags)
+ * Description
+ * For socket policies, insert *len* bytes into msg at offset
+ * *start*.
+ *
+ * If a program of type **BPF_PROG_TYPE_SK_MSG** is run on a
+ * *msg* it may want to insert metadata or options into the msg.
+ * This can later be read and used by any of the lower layer BPF
+ * hooks.
+ *
+ * This helper may fail if under memory pressure (a malloc
+ * fails) in these cases BPF programs will get an appropriate
+ * error and BPF programs will need to handle them.
+ *
+ * Return
+ * 0 on success, or a negative error in case of failure.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -2331,7 +2348,8 @@ union bpf_attr {
FN(sk_release), \
FN(map_push_elem), \
FN(map_pop_elem), \
- FN(map_peek_elem),
+ FN(map_peek_elem), \
+ FN(msg_push_data),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call

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