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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: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Lawrence Brakmo 2018-01-25 16:14:06 -08:00 committed by Alexei Starovoitov
parent 2585cd62f0
commit a33de39734
1 changed files with 8 additions and 5 deletions
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13
net/core/filter.c
View File

@ -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;