clnp.h

早期freebsd实现

#define CLNPSRCRT_CADDR(oidx, options)\
	((caddr_t)(CLNP_OFFTOOPT(options, oidx->cni_srcrt_s) + CLNPSRCRT_OFF(oidx, options)))

/* 
 *	return true if the src route has run out of routes
 *	this is true if the offset of next route is greater than the end of the rt 
 */
#define	CLNPSRCRT_TERM(oidx, options)\
	(CLNPSRCRT_OFF(oidx, options) > oidx->cni_srcrt_len)

/*
 *	Options a user can set/get
 */
#define	CLNPOPT_FLAGS	0x01	/* flags: seg permitted, no er xmit, etc  */
#define	CLNPOPT_OPTS	0x02	/* datagram options */

/*
 *	Values for particular datagram options
 */
#define	CLNPOVAL_PAD		0xcc	/* padding */
#define	CLNPOVAL_SECURE		0xc5	/* security */
#define	CLNPOVAL_SRCRT		0xc8	/* source routing */
#define	CLNPOVAL_RECRT		0xcb	/* record route */
#define	CLNPOVAL_QOS		0xc3	/* quality of service */
#define	CLNPOVAL_PRIOR		0xcd	/* priority */
#define CLNPOVAL_ERREAS		0xc1	/* ER PDU ONLY: reason for discard */

#define	CLNPOVAL_SRCSPEC	0x40	/* source address specific */
#define	CLNPOVAL_DSTSPEC	0x80	/* destination address specific */
#define	CLNPOVAL_GLOBAL		0xc0	/* globally unique */

/* Globally Unique QOS */
#define	CLNPOVAL_SEQUENCING	0x10	/* sequencing preferred */
#define CLNPOVAL_CONGESTED	0x08	/* congestion experienced */
#define CLNPOVAL_LOWDELAY	0x04	/* low transit delay */

#define	CLNPOVAL_PARTRT		0x00	/* partial source routing */
#define CLNPOVAL_COMPRT		0x01	/* complete source routing */

/*
 *	Clnp flags used in a control block flags field. 
 *	NOTE: these must be out of the range of bits defined in ../net/raw_cb.h
 */
#define	CLNP_NO_SEG		0x010	/* segmentation not permitted */
#define	CLNP_NO_ER		0x020	/* do not generate ERs */
#define CLNP_SEND_RAW	0x080	/* send pkt as RAW DT rather than TP DT */
#define	CLNP_NO_CKSUM	0x100	/* don't use clnp checksum */
#define CLNP_ECHO		0x200	/* send echo request */
#define	CLNP_NOCACHE	0x400	/* don't store cache information */
#define CLNP_ECHOR		0x800	/* send echo reply */

/* valid clnp flags */
#define CLNP_VFLAGS		(CLNP_SEND_RAW|CLNP_NO_SEG|CLNP_NO_ER|CLNP_NO_CKSUM\
	|CLNP_ECHO|CLNP_NOCACHE|CLNP_ECHOR)

/* 
 *	Constants used by clnp
 */
#define	CLNP_HDR_MIN	(sizeof (struct clnp_fixed))
#define	CLNP_HDR_MAX	(254)
#define	CLNP_TTL_UNITS	2					/* 500 milliseconds */
#define CLNP_TTL		15*CLNP_TTL_UNITS	/* time to live (seconds) */
#define	ISO8473_V1		0x01

/*
 *	Clnp packet types
 *	In order to test raw clnp and tp/clnp simultaneously, a third type of
 *	packet has been defined: CLNP_RAW. This is done so that the input
 *	routine can switch to the correct input routine (rclnp_input or
 *	tpclnp_input) based on the type field. If clnp had a higher level protocol
 *	field, this would not be necessary.
 */
#define	CLNP_DT			0x1C	/* normal data */
#define	CLNP_ER			0x01	/* error report */
#define	CLNP_RAW		0x1D	/* debug only */
#define CLNP_EC			0x1E	/* echo packet */
#define CLNP_ECR		0x1F	/* echo reply */

/*
 *	ER pdu error codes
 */
#define GEN_NOREAS			0x00	/* reason not specified */
#define GEN_PROTOERR		0x01	/* protocol procedure error */
#define GEN_BADCSUM			0x02	/* incorrect checksum */
#define GEN_CONGEST			0x03	/* pdu discarded due to congestion */
#define GEN_HDRSYNTAX		0x04	/* header syntax error */
#define GEN_SEGNEEDED		0x05	/* segmentation needed, but not permitted */
#define GEN_INCOMPLETE		0x06	/* incomplete pdu received */
#define GEN_DUPOPT			0x07	/* duplicate option */

/* address errors */
#define ADDR_DESTUNREACH	0x80	/* destination address unreachable */
#define ADDR_DESTUNKNOWN	0x81	/* destination address unknown */

/* source routing */
#define SRCRT_UNSPECERR		0x90	/* unspecified src rt error */
#define SRCRT_SYNTAX		0x91	/* syntax error in src rt field */
#define SRCRT_UNKNOWNADDR	0x92	/* unknown addr in src rt field */
#define SRCRT_BADPATH		0x93	/* path not acceptable */

/* lifetime */
#define TTL_EXPTRANSIT		0xa0	/* lifetime expired during transit */
#define TTL_EXPREASS		0xa1	/* lifetime expired during reassembly */

/* pdu discarded */
#define DISC_UNSUPPOPT		0xb0	/* unsupported option not specified? */
#define DISC_UNSUPPVERS		0xb1	/* unsupported protocol version */
#define DISC_UNSUPPSECURE	0xb2	/* unsupported security option */
#define DISC_UNSUPPSRCRT	0xb3	/* unsupported src rt option */
#define DISC_UNSUPPRECRT	0xb4	/* unsupported rec rt option */

/* reassembly */
#define REASS_INTERFERE		0xc0	/* reassembly interference */
#define CLNP_ERRORS		22


#ifdef KERNEL
int clnp_er_index();
#endif

#ifdef CLNP_ER_CODES
u_char clnp_er_codes[CLNP_ERRORS] =  {
GEN_NOREAS, GEN_PROTOERR, GEN_BADCSUM, GEN_CONGEST,
GEN_HDRSYNTAX, GEN_SEGNEEDED, GEN_INCOMPLETE, GEN_DUPOPT,
ADDR_DESTUNREACH, ADDR_DESTUNKNOWN,
SRCRT_UNSPECERR, SRCRT_SYNTAX, SRCRT_UNKNOWNADDR, SRCRT_BADPATH,
TTL_EXPTRANSIT, TTL_EXPREASS,
DISC_UNSUPPOPT, DISC_UNSUPPVERS, DISC_UNSUPPSECURE,
DISC_UNSUPPSRCRT, DISC_UNSUPPRECRT, REASS_INTERFERE };
#endif

#ifdef	TROLL

#define	TR_DUPEND		0x01	/* duplicate end of fragment */
#define TR_DUPPKT		0x02	/* duplicate entire packet */
#define	TR_DROPPKT		0x04	/* drop packet on output */
#define TR_TRIM			0x08	/* trim bytes from packet */
#define TR_CHANGE		0x10	/* change bytes in packet */
#define TR_MTU			0x20	/* delta to change device mtu */
#define	TR_CHUCK		0x40	/* drop packet in rclnp_input */
#define	TR_BLAST		0x80	/* force rclnp_output to blast many packet */
#define	TR_RAWLOOP		0x100	/* make if_loop call clnpintr directly */
struct troll {
	int		tr_ops;				/* operations to perform */
	float	tr_dup_size;		/* % to duplicate */
	float	tr_dup_freq;		/* frequency to duplicate packets */
	float	tr_drop_freq;		/* frequence to drop packets */
	int		tr_mtu_adj;			/* delta to adjust if mtu */
	int		tr_blast_cnt;		/* # of pkts to blast out */
};

#define	SN_OUTPUT(clcp, m)\
	troll_output(clcp->clc_ifp, m, clcp->clc_firsthop, clcp->clc_rt)

#define	SN_MTU(ifp, rt) (((rt && rt->rt_rmx.rmx_mtu) ?\
	rt->rt_rmx.rmx_mtu : clnp_badmtu(ifp, rt, __LINE__, __FILE__))\
		- trollctl.tr_mtu_adj)

#ifdef KERNEL
extern float troll_random;
#endif

#else	/* NO TROLL */

#define	SN_OUTPUT(clcp, m)\
	(*clcp->clc_ifp->if_output)(clcp->clc_ifp, m, clcp->clc_firsthop, clcp->clc_rt)

#define	SN_MTU(ifp, rt) (((rt && rt->rt_rmx.rmx_mtu) ?\
	rt->rt_rmx.rmx_mtu : clnp_badmtu(ifp, rt, __LINE__, __FILE__)))

#endif	/* TROLL */

/*
 *	Macro to remove an address from a clnp header
 */
#define CLNP_EXTRACT_ADDR(isoa, hoff, hend)\
	{\
		isoa.isoa_len = (u_char)*hoff;\
		if ((((++hoff) + isoa.isoa_len) > hend) ||\
			(isoa.isoa_len > 20) || (isoa.isoa_len == 0)) {\
			hoff = (caddr_t)0;\
		} else {\
			(void) bcopy(hoff, (caddr_t)isoa.isoa_genaddr, isoa.isoa_len);\
			hoff += isoa.isoa_len;\
		}\
	}

/*
 *	Macro to insert an address into a clnp header
 */
#define CLNP_INSERT_ADDR(hoff, isoa)\
	*hoff++ = (isoa).isoa_len;\
	(void) bcopy((caddr_t)((isoa).isoa_genaddr), hoff, (isoa).isoa_len);\
	hoff += (isoa).isoa_len;

/*
 *	Clnp hdr cache.	Whenever a clnp packet is sent, a copy of the
 *	header is made and kept in this cache. In addition to a copy of
 *	the cached clnp hdr, the cache contains
 *	information necessary to determine whether the new packet
 *	to send requires a new header to be built.
 */
struct clnp_cache {
	/* these fields are used to check the validity of the cache */
	struct iso_addr		clc_dst;		/* destination of packet */
	struct mbuf 		*clc_options;	/* ptr to options mbuf */
	int					clc_flags;		/* flags passed to clnp_output */

	/* these fields are state that clnp_output requires to finish the pkt */
	int					clc_segoff;		/* offset of seg part of header */
	struct rtentry		*clc_rt;		/* ptr to rtentry (points into
											the route structure) */
	struct sockaddr		*clc_firsthop;	/* first hop of packet */
	struct ifnet		*clc_ifp;		/* ptr to interface structure */
	struct iso_ifaddr	*clc_ifa;		/* ptr to interface address */
	struct mbuf 		*clc_hdr;		/* cached pkt hdr (finally)! */
};

#ifndef	satosiso
#define	satosiso(sa)\
	((struct sockaddr_iso *)(sa))
#endif

#ifdef	KERNEL
caddr_t			clnp_insert_addr();
struct iso_addr	*clnp_srcaddr();
struct mbuf		*clnp_reass();
#ifdef	TROLL
struct troll	trollctl;
#endif	/* TROLL */
#endif	/* KERNEL */