a0f4ecf349
There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com>
95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
#ifndef _CONNTRACK_PROTO_GRE_H
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#define _CONNTRACK_PROTO_GRE_H
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#include <asm/byteorder.h>
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/* GRE PROTOCOL HEADER */
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/* GRE Version field */
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#define GRE_VERSION_1701 0x0
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#define GRE_VERSION_PPTP 0x1
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/* GRE Protocol field */
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#define GRE_PROTOCOL_PPTP 0x880B
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/* GRE Flags */
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#define GRE_FLAG_C 0x80
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#define GRE_FLAG_R 0x40
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#define GRE_FLAG_K 0x20
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#define GRE_FLAG_S 0x10
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#define GRE_FLAG_A 0x80
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#define GRE_IS_C(f) ((f)&GRE_FLAG_C)
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#define GRE_IS_R(f) ((f)&GRE_FLAG_R)
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#define GRE_IS_K(f) ((f)&GRE_FLAG_K)
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#define GRE_IS_S(f) ((f)&GRE_FLAG_S)
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#define GRE_IS_A(f) ((f)&GRE_FLAG_A)
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/* GRE is a mess: Four different standards */
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struct gre_hdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u16 rec:3,
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srr:1,
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seq:1,
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key:1,
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routing:1,
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csum:1,
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version:3,
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reserved:4,
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ack:1;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u16 csum:1,
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routing:1,
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key:1,
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seq:1,
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srr:1,
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rec:3,
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ack:1,
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reserved:4,
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version:3;
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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__be16 protocol;
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};
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/* modified GRE header for PPTP */
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struct gre_hdr_pptp {
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__u8 flags; /* bitfield */
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__u8 version; /* should be GRE_VERSION_PPTP */
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__be16 protocol; /* should be GRE_PROTOCOL_PPTP */
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__be16 payload_len; /* size of ppp payload, not inc. gre header */
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__be16 call_id; /* peer's call_id for this session */
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__be32 seq; /* sequence number. Present if S==1 */
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__be32 ack; /* seq number of highest packet received by */
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/* sender in this session */
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};
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struct nf_ct_gre {
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unsigned int stream_timeout;
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unsigned int timeout;
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};
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#ifdef __KERNEL__
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#include <net/netfilter/nf_conntrack_tuple.h>
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struct nf_conn;
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/* structure for original <-> reply keymap */
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struct nf_ct_gre_keymap {
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struct list_head list;
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struct nf_conntrack_tuple tuple;
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};
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/* add new tuple->key_reply pair to keymap */
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int nf_ct_gre_keymap_add(struct nf_conn *ct, enum ip_conntrack_dir dir,
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struct nf_conntrack_tuple *t);
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/* delete keymap entries */
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void nf_ct_gre_keymap_destroy(struct nf_conn *ct);
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void nf_ct_gre_keymap_flush(struct net *net);
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void nf_nat_need_gre(void);
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#endif /* __KERNEL__ */
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#endif /* _CONNTRACK_PROTO_GRE_H */
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