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Commit a33de397 authored by Lawrence Brakmo's avatar Lawrence Brakmo Committed by Alexei Starovoitov
Browse files

bpf: Make SOCK_OPS_GET_TCP size independent 



Make SOCK_OPS_GET_TCP helper macro size independent (before only worked
with 4-byte fields.

Signed-off-by: default avatarLawrence Brakmo <brakmo@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 2585cd62

net/core/filter.c

+8 −5
Original line number Diff line number Diff line
@@ -4470,9 +4470,10 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 
		break;



/* Helper macro for adding read access to tcp_sock fields. */

#define SOCK_OPS_GET_TCP32(FIELD_NAME)					      \

#define SOCK_OPS_GET_TCP(FIELD_NAME)					      \

	do {								      \

		BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, FIELD_NAME) != 4); \

		BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, FIELD_NAME) >      \

			     FIELD_SIZEOF(struct bpf_sock_ops, FIELD_NAME));  \

		*insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(			      \

						struct bpf_sock_ops_kern,     \

						is_fullsock),		      \
@@ -4484,16 +4485,18 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 
						struct bpf_sock_ops_kern, sk),\

				      si->dst_reg, si->src_reg,		      \

				      offsetof(struct bpf_sock_ops_kern, sk));\

		*insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,        \

		*insn++ = BPF_LDX_MEM(FIELD_SIZEOF(struct tcp_sock,	      \

						   FIELD_NAME), si->dst_reg,  \

				      si->dst_reg,			      \

				      offsetof(struct tcp_sock, FIELD_NAME)); \

	} while (0)



	case offsetof(struct bpf_sock_ops, snd_cwnd):

		SOCK_OPS_GET_TCP32(snd_cwnd);

		SOCK_OPS_GET_TCP(snd_cwnd);

		break;



	case offsetof(struct bpf_sock_ops, srtt_us):

		SOCK_OPS_GET_TCP32(srtt_us);

		SOCK_OPS_GET_TCP(srtt_us);

		break;

	}

	return insn - insn_buf;