This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / linux / netfilter / nf_conntrack_proto_gre.h

diff --git a/include/linux/netfilter/nf_conntrack_proto_gre.h b/include/linux/netfilter/nf_conntrack_proto_gre.h
new file mode 100644 (file)
index 0000000..4e6bbce
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_proto_gre.h
@@ -0,0 +1,112 @@
+#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
+       __be16  protocol;
+};
+
+/* modified GRE header for PPTP */
+struct gre_hdr_pptp {
+       __u8   flags;           /* bitfield */
+       __u8   version;         /* should be GRE_VERSION_PPTP */
+       __be16 protocol;        /* should be GRE_PROTOCOL_PPTP */
+       __be16 payload_len;     /* size of ppp payload, not inc. gre header */
+       __be16 call_id;         /* peer's call_id for this session */
+       __be32 seq;             /* sequence number.  Present if S==1 */
+       __be32 ack;             /* seq number of highest packet recieved by */
+                               /*  sender in this session */
+};
+
+struct nf_ct_gre {
+       unsigned int stream_timeout;
+       unsigned int timeout;
+};
+
+#ifdef __KERNEL__
+#include <net/netfilter/nf_conntrack_tuple.h>
+
+struct nf_conn;
+
+/* structure for original <-> reply keymap */
+struct nf_ct_gre_keymap {
+       struct list_head list;
+       struct nf_conntrack_tuple tuple;
+};
+
+/* add new tuple->key_reply pair to keymap */
+int nf_ct_gre_keymap_add(struct nf_conn *ct, enum ip_conntrack_dir dir,
+                        struct nf_conntrack_tuple *t);
+
+/* delete keymap entries */
+void nf_ct_gre_keymap_destroy(struct nf_conn *ct);
+
+/* get pointer to gre key, if present */
+static inline __be32 *gre_key(struct gre_hdr *greh)
+{
+       if (!greh->key)
+               return NULL;
+       if (greh->csum || greh->routing)
+               return (__be32 *)(greh+sizeof(*greh)+4);
+       return (__be32 *)(greh+sizeof(*greh));
+}
+
+/* get pointer ot gre csum, if present */
+static inline __sum16 *gre_csum(struct gre_hdr *greh)
+{
+       if (!greh->csum)
+               return NULL;
+       return (__sum16 *)(greh+sizeof(*greh));
+}
+
+extern void nf_ct_gre_keymap_flush(void);
+extern void nf_nat_need_gre(void);
+
+#endif /* __KERNEL__ */
+#endif /* _CONNTRACK_PROTO_GRE_H */