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Commit f908d26b authored by John Fastabend's avatar John Fastabend Committed by Daniel Borkmann
Browse files

bpf: libbpf support for msg_push_data 



Add support for new bpf_msg_push_data in libbpf.

Signed-off-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 6fff607e

tools/include/uapi/linux/bpf.h

+19 −1
Original line number Diff line number Diff line
@@ -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

tools/testing/selftests/bpf/bpf_helpers.h

+2 −0
Original line number Diff line number Diff line
@@ -111,6 +111,8 @@ static int (*bpf_msg_cork_bytes)(void *ctx, int len) = 
	(void *) BPF_FUNC_msg_cork_bytes;

static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) =

	(void *) BPF_FUNC_msg_pull_data;

static int (*bpf_msg_push_data)(void *ctx, int start, int end, int flags) =

	(void *) BPF_FUNC_msg_push_data;

static int (*bpf_bind)(void *ctx, void *addr, int addr_len) =

	(void *) BPF_FUNC_bind;

static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) =