mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 18:09:05 +00:00
926b50f92a
This new "version 3" PPTP conntrack/nat helper is finally ready for mainline inclusion. Special thanks to lots of last-minute bugfixing by Patric McHardy. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
#ifndef _CONNTRACK_PROTO_GRE_H
|
|
#define _CONNTRACK_PROTO_GRE_H
|
|
#include <asm/byteorder.h>
|
|
|
|
/* GRE PROTOCOL HEADER */
|
|
|
|
/* GRE Version field */
|
|
#define GRE_VERSION_1701 0x0
|
|
#define GRE_VERSION_PPTP 0x1
|
|
|
|
/* GRE Protocol field */
|
|
#define GRE_PROTOCOL_PPTP 0x880B
|
|
|
|
/* GRE Flags */
|
|
#define GRE_FLAG_C 0x80
|
|
#define GRE_FLAG_R 0x40
|
|
#define GRE_FLAG_K 0x20
|
|
#define GRE_FLAG_S 0x10
|
|
#define GRE_FLAG_A 0x80
|
|
|
|
#define GRE_IS_C(f) ((f)&GRE_FLAG_C)
|
|
#define GRE_IS_R(f) ((f)&GRE_FLAG_R)
|
|
#define GRE_IS_K(f) ((f)&GRE_FLAG_K)
|
|
#define GRE_IS_S(f) ((f)&GRE_FLAG_S)
|
|
#define GRE_IS_A(f) ((f)&GRE_FLAG_A)
|
|
|
|
/* GRE is a mess: Four different standards */
|
|
struct gre_hdr {
|
|
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
|
__u16 rec:3,
|
|
srr:1,
|
|
seq:1,
|
|
key:1,
|
|
routing:1,
|
|
csum:1,
|
|
version:3,
|
|
reserved:4,
|
|
ack:1;
|
|
#elif defined(__BIG_ENDIAN_BITFIELD)
|
|
__u16 csum:1,
|
|
routing:1,
|
|
key:1,
|
|
seq:1,
|
|
srr:1,
|
|
rec:3,
|
|
ack:1,
|
|
reserved:4,
|
|
version:3;
|
|
#else
|
|
#error "Adjust your <asm/byteorder.h> defines"
|
|
#endif
|
|
__u16 protocol;
|
|
};
|
|
|
|
/* modified GRE header for PPTP */
|
|
struct gre_hdr_pptp {
|
|
__u8 flags; /* bitfield */
|
|
__u8 version; /* should be GRE_VERSION_PPTP */
|
|
__u16 protocol; /* should be GRE_PROTOCOL_PPTP */
|
|
__u16 payload_len; /* size of ppp payload, not inc. gre header */
|
|
__u16 call_id; /* peer's call_id for this session */
|
|
__u32 seq; /* sequence number. Present if S==1 */
|
|
__u32 ack; /* seq number of highest packet recieved by */
|
|
/* sender in this session */
|
|
};
|
|
|
|
|
|
/* this is part of ip_conntrack */
|
|
struct ip_ct_gre {
|
|
unsigned int stream_timeout;
|
|
unsigned int timeout;
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
struct ip_conntrack_expect;
|
|
struct ip_conntrack;
|
|
|
|
/* structure for original <-> reply keymap */
|
|
struct ip_ct_gre_keymap {
|
|
struct list_head list;
|
|
|
|
struct ip_conntrack_tuple tuple;
|
|
};
|
|
|
|
/* add new tuple->key_reply pair to keymap */
|
|
int ip_ct_gre_keymap_add(struct ip_conntrack *ct,
|
|
struct ip_conntrack_tuple *t,
|
|
int reply);
|
|
|
|
/* delete keymap entries */
|
|
void ip_ct_gre_keymap_destroy(struct ip_conntrack *ct);
|
|
|
|
|
|
/* get pointer to gre key, if present */
|
|
static inline u_int32_t *gre_key(struct gre_hdr *greh)
|
|
{
|
|
if (!greh->key)
|
|
return NULL;
|
|
if (greh->csum || greh->routing)
|
|
return (u_int32_t *) (greh+sizeof(*greh)+4);
|
|
return (u_int32_t *) (greh+sizeof(*greh));
|
|
}
|
|
|
|
/* get pointer ot gre csum, if present */
|
|
static inline u_int16_t *gre_csum(struct gre_hdr *greh)
|
|
{
|
|
if (!greh->csum)
|
|
return NULL;
|
|
return (u_int16_t *) (greh+sizeof(*greh));
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _CONNTRACK_PROTO_GRE_H */
|