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95 lines
3.6 KiB
C
95 lines
3.6 KiB
C
/*
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p0f - TCP/IP packet matching
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----------------------------
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Copyright (C) 2012 by Michal Zalewski <lcamtuf@coredump.cx>
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Distributed under the terms and conditions of GNU LGPL.
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*/
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#ifndef _HAVE_FP_TCP_H
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#define _HAVE_FP_TCP_H
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#include "types.h"
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/* Simplified data for signature matching and NAT detection: */
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struct tcp_sig {
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u32 opt_hash; /* Hash of opt_layout & opt_cnt */
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u32 quirks; /* Quirks */
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u8 opt_eol_pad; /* Amount of padding past EOL */
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u8 ip_opt_len; /* Length of IP options */
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s8 ip_ver; /* -1 = any, IP_VER4, IP_VER6 */
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u8 ttl; /* Actual TTL */
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s32 mss; /* Maximum segment size (-1 = any) */
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u16 win; /* Window size */
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u8 win_type; /* WIN_TYPE_* */
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s16 wscale; /* Window scale (-1 = any) */
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s8 pay_class; /* -1 = any, 0 = zero, 1 = non-zero */
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u16 tot_hdr; /* Total header length */
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u32 ts1; /* Own timestamp */
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u64 recv_ms; /* Packet recv unix time (ms) */
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/* Information used for matching with p0f.fp: */
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struct tcp_sig_record* matched; /* NULL = no match */
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u8 fuzzy; /* Approximate match? */
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u8 dist; /* Distance */
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};
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/* Methods for matching window size in tcp_sig: */
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#define WIN_TYPE_NORMAL 0x00 /* Literal value */
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#define WIN_TYPE_ANY 0x01 /* Wildcard (p0f.fp sigs only) */
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#define WIN_TYPE_MOD 0x02 /* Modulo check (p0f.fp sigs only) */
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#define WIN_TYPE_MSS 0x03 /* Window size MSS multiplier */
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#define WIN_TYPE_MTU 0x04 /* Window size MTU multiplier */
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/* Record for a TCP signature read from p0f.fp: */
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struct tcp_sig_record {
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u8 generic; /* Generic entry? */
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s32 class_id; /* OS class ID (-1 = user) */
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s32 name_id; /* OS name ID */
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u8* flavor; /* Human-readable flavor string */
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u32 label_id; /* Signature label ID */
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u32* sys; /* OS class / name IDs for user apps */
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u32 sys_cnt; /* Length of sys */
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u32 line_no; /* Line number in p0f.fp */
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u8 bad_ttl; /* TTL is generated randomly */
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struct tcp_sig* sig; /* Actual signature data */
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};
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#include "process.h"
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struct packet_data;
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struct packet_flow;
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void tcp_register_sig(u8 to_srv, u8 generic, s32 sig_class, u32 sig_name,
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u8* sig_flavor, u32 label_id, u32* sys, u32 sys_cnt,
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u8* val, u32 line_no);
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struct tcp_sig* fingerprint_tcp(u8 to_srv, struct packet_data* pk,
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struct packet_flow* f);
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void fingerprint_sendsyn(struct packet_data* pk);
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void check_ts_tcp(u8 to_srv, struct packet_data* pk, struct packet_flow* f);
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#endif /* _HAVE_FP_TCP_H */
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