bpf: Support passing args to sock_ops bpf function

Adds support for passing up to 4 arguments to sock_ops bpf functions. It reusues the reply union, so the bpf_sock_ops structures are not increased in size.

Lawrence Brakmo committed 8 years ago

Commit de525be1 parent b73042b6 files · +42 −10Browse files

Showing the changes to include/uapi/linux (1 of 6 files). Show all

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include/uapi/linux/bpf.h+3−2

@@ -952,8 +952,9 @@ struct bpf_map_info { · 951 unmodified lines
952	952	struct bpf_sock_ops {
953	953	__u32 op;
954	954	union {
955		− __u32 reply;
956		− __u32 replylong[4];
	955	+ __u32 args[4]; /* Optionally passed to bpf program */
	956	+ __u32 reply; /* Returned by bpf program */
	957	+ __u32 replylong[4]; /* Optionally returned by bpf prog */
957	958	};
958	959	__u32 family;
959	960	__u32 remote_ip4; /* Stored in network byte order */