pptp: Refactor the struct and macros of PPTP codes

1. Use struct gre_base_hdr directly in pptp_gre_header instead of
duplicated members;
2. Use existing macros like GRE_KEY, GRE_SEQ, and so on instead of
duplicated macros defined by PPTP;
3. Add new macros like GRE_IS_ACK/SEQ and so on instead of
PPTP_GRE_IS_A/S and so on;

Signed-off-by: Gao Feng <fgao@ikuai8.com>
Reviewed-by: Philip Prindeville <philipp@redfish-solutions.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 18 deletions

diff --git a/include/net/pptp.h b/include/net/pptp.h
index 301d3e2ba1f9..92e9f1fe2628 100644
--- a/include/net/pptp.h
+++ b/include/net/pptp.h
@@ -10,26 +10,9 @@
 	((((curseq) & 0xffffff00) == 0) &&\
 	(((lastseq) & 0xffffff00) == 0xffffff00))
 
-#define PPTP_GRE_PROTO  0x880B
-#define PPTP_GRE_VER    0x1
-
-#define PPTP_GRE_FLAG_C 0x80
-#define PPTP_GRE_FLAG_R 0x40
-#define PPTP_GRE_FLAG_K 0x20
-#define PPTP_GRE_FLAG_S 0x10
-#define PPTP_GRE_FLAG_A 0x80
-
-#define PPTP_GRE_IS_C(f) ((f)&PPTP_GRE_FLAG_C)
-#define PPTP_GRE_IS_R(f) ((f)&PPTP_GRE_FLAG_R)
-#define PPTP_GRE_IS_K(f) ((f)&PPTP_GRE_FLAG_K)
-#define PPTP_GRE_IS_S(f) ((f)&PPTP_GRE_FLAG_S)
-#define PPTP_GRE_IS_A(f) ((f)&PPTP_GRE_FLAG_A)
-
 #define PPTP_HEADER_OVERHEAD (2+sizeof(struct pptp_gre_header))
 struct pptp_gre_header {
-	u8  flags;
-	u8  ver;
-	__be16 protocol;
+	struct gre_base_hdr gre_hd;
 	__be16 payload_len;
 	__be16 call_id;
 	__be32 seq;