#ifndef _NF_OSF_H #define _NF_OSF_H #include <linux/types.h> #include <linux/ip.h> #include <linux/tcp.h> #define MAXGENRELEN 32 #define NF_OSF_GENRE (1 << 0) #define NF_OSF_TTL (1 << 1) #define NF_OSF_LOG (1 << 2) #define NF_OSF_INVERT (1 << 3) #define NF_OSF_LOGLEVEL_ALL 0 /* log all matched fingerprints */ #define NF_OSF_LOGLEVEL_FIRST 1 /* log only the first matced fingerprint */ #define NF_OSF_LOGLEVEL_ALL_KNOWN 2 /* do not log unknown packets */ #define NF_OSF_TTL_TRUE 0 /* True ip and fingerprint TTL comparison */ /* Check if ip TTL is less than fingerprint one */ #define NF_OSF_TTL_LESS 1 /* Do not compare ip and fingerprint TTL at all */ #define NF_OSF_TTL_NOCHECK 2 #define NF_OSF_FLAGMASK (NF_OSF_GENRE | NF_OSF_TTL | \ NF_OSF_LOG | NF_OSF_INVERT) /* Wildcard MSS (kind of). * It is used to implement a state machine for the different wildcard values * of the MSS and window sizes. */ struct nf_osf_wc { __u32 wc; __u32 val; }; /* This struct represents IANA options * http://www.iana.org/assignments/tcp-parameters */ struct nf_osf_opt { __u16 kind, length; struct nf_osf_wc wc; }; struct nf_osf_info { char genre[MAXGENRELEN]; __u32 len; __u32 flags; __u32 loglevel; __u32 ttl; }; struct nf_osf_user_finger { struct nf_osf_wc wss; __u8 ttl, df; __u16 ss, mss; __u16 opt_num; char genre[MAXGENRELEN]; char version[MAXGENRELEN]; char subtype[MAXGENRELEN]; /* MAX_IPOPTLEN is maximum if all options are NOPs or EOLs */ struct nf_osf_opt opt[MAX_IPOPTLEN]; }; struct nf_osf_nlmsg { struct nf_osf_user_finger f; struct iphdr ip; struct tcphdr tcp; }; /* Defines for IANA option kinds */ enum iana_options { OSFOPT_EOL = 0, /* End of options */ OSFOPT_NOP, /* NOP */ OSFOPT_MSS, /* Maximum segment size */ OSFOPT_WSO, /* Window scale option */ OSFOPT_SACKP, /* SACK permitted */ OSFOPT_SACK, /* SACK */ OSFOPT_ECHO, OSFOPT_ECHOREPLY, OSFOPT_TS, /* Timestamp option */ OSFOPT_POCP, /* Partial Order Connection Permitted */ OSFOPT_POSP, /* Partial Order Service Profile */ /* Others are not used in the current OSF */ OSFOPT_EMPTY = 255, }; /* Initial window size option state machine: multiple of mss, mtu or * plain numeric value. Can also be made as plain numeric value which * is not a multiple of specified value. */ enum nf_osf_window_size_options { OSF_WSS_PLAIN = 0, OSF_WSS_MSS, OSF_WSS_MTU, OSF_WSS_MODULO, OSF_WSS_MAX, }; enum nf_osf_attr_type { OSF_ATTR_UNSPEC, OSF_ATTR_FINGER, OSF_ATTR_MAX, }; /* * Add/remove fingerprint from the kernel. */ enum nf_osf_msg_types { OSF_MSG_ADD, OSF_MSG_REMOVE, OSF_MSG_MAX, }; #endif /* _NF_OSF_H */