[unix-history] / usr / src / sys / net / bpf.h

/*
 * Copyright (c) 1990, 1991 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from the Stanford/CMU enet packet filter,
 * (net/enet.c) distributed as part of 4.3BSD, and code contributed
 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
 * Berkeley Laboratory.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)bpf.h	7.3 (Berkeley) %G%
 *
 * @(#) $Header: bpf.h,v 1.24 91/10/27 21:22:32 mccanne Exp $ (LBL)
 */

/*
 * Alignment macros.  BPF_WORDALIGN rounds up to the next 
 * even multiple of BPF_ALIGNMENT. 
 */
#define BPF_ALIGNMENT sizeof(long)
#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))

#define BPF_MAXINSNS 512
#define BPF_MAXBUFSIZE 0x8000

/*
 *  Structure for BIOCSETF.
 */
struct bpf_program {
	u_int bf_len;
	struct bpf_insn *bf_insns;
};
 
/*
 * Struct returned by BIOCGSTATS.
 */
struct bpf_stat {
	u_int bs_recv;		/* number of packets received */
	u_int bs_drop;		/* number of packets dropped */
};

/*
 * BPF ioctls
 *
 * The first set is for compatibility with Sun's pcc style
 * header files.  If your using gcc, we assume that you
 * have run fixincludes so the latter set should work.
 */
#if (defined(sun) || defined(ibm032)) && !defined(__GNUC__)
#define	BIOCGBLEN	_IOR(B,102, u_int)
#define	BIOCSBLEN	_IOWR(B,102, u_int)
#define	BIOCSETF	_IOW(B,103, struct bpf_program)
#define	BIOCFLUSH	_IO(B,104)
#define BIOCPROMISC	_IO(B,105)
#define	BIOCGDLT	_IOR(B,106, u_int)
#define BIOCGETIF	_IOR(B,107, struct ifreq)
#define BIOCSETIF	_IOW(B,108, struct ifreq)
#define BIOCSRTIMEOUT	_IOW(B,109, struct timeval)
#define BIOCGRTIMEOUT	_IOR(B,110, struct timeval)
#define BIOCGSTATS	_IOR(B,111, struct bpf_stat)
#define BIOCIMMEDIATE	_IOW(B,112, u_int)
#else
#define	BIOCGBLEN	_IOR('B',102, u_int)
#define	BIOCSBLEN	_IOWR('B',102, u_int)
#define	BIOCSETF	_IOW('B',103, struct bpf_program)
#define	BIOCFLUSH	_IO('B',104)
#define BIOCPROMISC	_IO('B',105)
#define	BIOCGDLT	_IOR('B',106, u_int)
#define BIOCGETIF	_IOR('B',107, struct ifreq)
#define BIOCSETIF	_IOW('B',108, struct ifreq)
#define BIOCSRTIMEOUT	_IOW('B',109, struct timeval)
#define BIOCGRTIMEOUT	_IOR('B',110, struct timeval)
#define BIOCGSTATS	_IOR('B',111, struct bpf_stat)
#define BIOCIMMEDIATE	_IOW('B',112, u_int)
#endif

/*
 * Structure prepended to each packet.
 */
struct bpf_hdr {
	struct timeval	bh_tstamp;	/* time stamp */
	u_long		bh_caplen;	/* length of captured portion */
	u_long		bh_datalen;	/* original length of packet */
	u_short		bh_hdrlen;	/* length of bpf header (this struct
					   plus alignment padding) */
};
/*
 * Because the structure above is not a multiple of 4 bytes, some compilers
 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
 * Only the kernel needs to know about it; applications use bh_hdrlen.
 */
#ifdef KERNEL
#define SIZEOF_BPF_HDR 18
#endif

/*
 * Data-link level type codes.
 * Currently, only DLT_EN10MB and DLT_SLIP are supported.
 */
#define DLT_NULL	0	/* no link-layer encapsulation */
#define DLT_EN10MB	1	/* Ethernet (10Mb) */
#define DLT_EN3MB	2	/* Experimental Ethernet (3Mb) */
#define DLT_AX25	3	/* Amateur Radio AX.25 */
#define DLT_PRONET	4	/* Proteon ProNET Token Ring */
#define DLT_CHAOS	5	/* Chaos */
#define DLT_IEEE802	6	/* IEEE 802 Networks */
#define DLT_ARCNET	7	/* ARCNET */
#define DLT_SLIP	8	/* Serial Line IP */
#define DLT_PPP		9	/* Point-to-point Protocol */
#define DLT_FDDI	10	/* FDDI */

/*
 * The instruction encondings.
 */
/* classes <2:0> */
#define BPF_CLASS(code) ((code) & 0x07)
#define		BPF_LD		0x00
#define		BPF_LDX		0x01
#define		BPF_ST		0x02
#define		BPF_STX		0x03
#define		BPF_ALU		0x04
#define		BPF_JMP		0x05
#define		BPF_RET		0x06
#define		BPF_MISC	0x07

/* ld/ldx fields */
#define BPF_SIZE(code)	((code) & 0x18)
#define		BPF_W		0x00
#define		BPF_H		0x08
#define		BPF_B		0x10
#define BPF_MODE(code)	((code) & 0xe0)
#define		BPF_IMM 	0x00
#define		BPF_ABS		0x20
#define		BPF_IND		0x40
#define		BPF_MEM		0x60
#define		BPF_LEN		0x80
#define		BPF_MSH		0xa0

/* alu/jmp fields */
#define BPF_OP(code)	((code) & 0xf0)
#define		BPF_ADD		0x00
#define		BPF_SUB		0x10
#define		BPF_MUL		0x20
#define		BPF_DIV		0x30
#define		BPF_OR		0x40
#define		BPF_AND		0x50
#define		BPF_LSH		0x60
#define		BPF_RSH		0x70
#define		BPF_NEG		0x80
#define		BPF_JA		0x00
#define		BPF_JEQ		0x10
#define		BPF_JGT		0x20
#define		BPF_JGE		0x30
#define		BPF_JSET	0x40
#define BPF_SRC(code)	((code) & 0x08)
#define		BPF_K		0x00
#define		BPF_X		0x08

/* ret - BPF_K and BPF_X also apply */
#define BPF_RVAL(code)	((code) & 0x18)
#define		BPF_A		0x10

/* misc */
#define BPF_MISCOP(code) ((code) & 0xf8)
#define		BPF_TAX		0x00
#define		BPF_TXA		0x80

/*
 * The instruction data structure.
 */
struct bpf_insn {
	u_short	code;
	u_char 	jt;
	u_char 	jf;
	long	k;
};

/*
 * Macros for insn array initializers.
 */
#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }

#ifdef KERNEL
extern u_int bpf_filter();
extern void bpfattach();
extern void bpf_tap();
extern void bpf_mtap();
#endif

/*
 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
 */
#define BPF_MEMWORDS 16
Commit	Line	Data
81c7b6ec SM	1	/*
81c7b6ec SM	2	* Copyright (c) 1990, 1991 Regents of the University of California.
11569edc SM	3	* All rights reserved.
11569edc SM	4	*
6cfe221b KB	5	* This code is derived from the Stanford/CMU enet packet filter,
6cfe221b KB	6	* (net/enet.c) distributed as part of 4.3BSD, and code contributed
81c7b6ec	7	* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
d9f44bf8	8	* Berkeley Laboratory.
11569edc	9	*
81c7b6ec	10	* %sccs.include.redist.c%
6cfe221b	11	*
81c7b6ec	12	* @(#)bpf.h 7.3 (Berkeley) %G%
d9f44bf8 SM	13	*
d9f44bf8 SM	14	* @(#) $Header: bpf.h,v 1.24 91/10/27 21:22:32 mccanne Exp $ (LBL)
11569edc SM	15	*/
	16
	17	/*
	18	* Alignment macros. BPF_WORDALIGN rounds up to the next
	19	* even multiple of BPF_ALIGNMENT.
	20	*/
	21	#define BPF_ALIGNMENT sizeof(long)
	22	#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
	23
f8e186b1 SM	24	#define BPF_MAXINSNS 512
	25	#define BPF_MAXBUFSIZE 0x8000
	26
11569edc SM	27	/*
	28	* Structure for BIOCSETF.
	29	*/
	30	struct bpf_program {
	31	u_int bf_len;
	32	struct bpf_insn *bf_insns;
	33	};
	34
	35	/*
	36	* Struct returned by BIOCGSTATS.
	37	*/
	38	struct bpf_stat {
	39	u_int bs_recv; /* number of packets received */
	40	u_int bs_drop; /* number of packets dropped */
	41	};
	42
	43	/*
	44	* BPF ioctls
	45	*
	46	* The first set is for compatibility with Sun's pcc style
	47	* header files. If your using gcc, we assume that you
	48	* have run fixincludes so the latter set should work.
	49	*/
d9f44bf8	50	#if (defined(sun) \|\| defined(ibm032)) && !defined(__GNUC__)
11569edc	51	#define BIOCGBLEN _IOR(B,102, u_int)
d9f44bf8	52	#define BIOCSBLEN _IOWR(B,102, u_int)
11569edc SM	53	#define BIOCSETF _IOW(B,103, struct bpf_program)
	54	#define BIOCFLUSH _IO(B,104)
	55	#define BIOCPROMISC _IO(B,105)
732c04ca	56	#define BIOCGDLT _IOR(B,106, u_int)
11569edc SM	57	#define BIOCGETIF _IOR(B,107, struct ifreq)
	58	#define BIOCSETIF _IOW(B,108, struct ifreq)
	59	#define BIOCSRTIMEOUT _IOW(B,109, struct timeval)
	60	#define BIOCGRTIMEOUT _IOR(B,110, struct timeval)
	61	#define BIOCGSTATS _IOR(B,111, struct bpf_stat)
	62	#define BIOCIMMEDIATE _IOW(B,112, u_int)
	63	#else
11569edc	64	#define BIOCGBLEN _IOR('B',102, u_int)
d9f44bf8	65	#define BIOCSBLEN _IOWR('B',102, u_int)
11569edc SM	66	#define BIOCSETF _IOW('B',103, struct bpf_program)
	67	#define BIOCFLUSH _IO('B',104)
	68	#define BIOCPROMISC _IO('B',105)
732c04ca	69	#define BIOCGDLT _IOR('B',106, u_int)
11569edc SM	70	#define BIOCGETIF _IOR('B',107, struct ifreq)
	71	#define BIOCSETIF _IOW('B',108, struct ifreq)
	72	#define BIOCSRTIMEOUT _IOW('B',109, struct timeval)
	73	#define BIOCGRTIMEOUT _IOR('B',110, struct timeval)
	74	#define BIOCGSTATS _IOR('B',111, struct bpf_stat)
	75	#define BIOCIMMEDIATE _IOW('B',112, u_int)
	76	#endif
	77
11569edc SM	78	/*
	79	* Structure prepended to each packet.
	80	*/
	81	struct bpf_hdr {
	82	struct timeval bh_tstamp; /* time stamp */
	83	u_long bh_caplen; /* length of captured portion */
	84	u_long bh_datalen; /* original length of packet */
	85	u_short bh_hdrlen; /* length of bpf header (this struct
	86	plus alignment padding) */
	87	};
	88	/*
	89	* Because the structure above is not a multiple of 4 bytes, some compilers
	90	* will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
	91	* Only the kernel needs to know about it; applications use bh_hdrlen.
	92	*/
	93	#ifdef KERNEL
	94	#define SIZEOF_BPF_HDR 18
	95	#endif
	96
	97	/*
	98	* Data-link level type codes.
732c04ca	99	* Currently, only DLT_EN10MB and DLT_SLIP are supported.
11569edc	100	*/
d9f44bf8	101	#define DLT_NULL 0 /* no link-layer encapsulation */
11569edc SM	102	#define DLT_EN10MB 1 /* Ethernet (10Mb) */
	103	#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
	104	#define DLT_AX25 3 /* Amateur Radio AX.25 */
	105	#define DLT_PRONET 4 /* Proteon ProNET Token Ring */
	106	#define DLT_CHAOS 5 /* Chaos */
	107	#define DLT_IEEE802 6 /* IEEE 802 Networks */
	108	#define DLT_ARCNET 7 /* ARCNET */
	109	#define DLT_SLIP 8 /* Serial Line IP */
	110	#define DLT_PPP 9 /* Point-to-point Protocol */
	111	#define DLT_FDDI 10 /* FDDI */
	112
	113	/*
e6ce130c	114	* The instruction encondings.
11569edc	115	*/
e6ce130c SM	116	/* classes <2:0> */
	117	#define BPF_CLASS(code) ((code) & 0x07)
	118	#define BPF_LD 0x00
	119	#define BPF_LDX 0x01
	120	#define BPF_ST 0x02
	121	#define BPF_STX 0x03
	122	#define BPF_ALU 0x04
	123	#define BPF_JMP 0x05
	124	#define BPF_RET 0x06
	125	#define BPF_MISC 0x07
	126
	127	/* ld/ldx fields */
	128	#define BPF_SIZE(code) ((code) & 0x18)
	129	#define BPF_W 0x00
	130	#define BPF_H 0x08
	131	#define BPF_B 0x10
	132	#define BPF_MODE(code) ((code) & 0xe0)
	133	#define BPF_IMM 0x00
	134	#define BPF_ABS 0x20
	135	#define BPF_IND 0x40
	136	#define BPF_MEM 0x60
	137	#define BPF_LEN 0x80
	138	#define BPF_MSH 0xa0
	139
	140	/* alu/jmp fields */
	141	#define BPF_OP(code) ((code) & 0xf0)
	142	#define BPF_ADD 0x00
	143	#define BPF_SUB 0x10
	144	#define BPF_MUL 0x20
	145	#define BPF_DIV 0x30
	146	#define BPF_OR 0x40
	147	#define BPF_AND 0x50
	148	#define BPF_LSH 0x60
	149	#define BPF_RSH 0x70
	150	#define BPF_NEG 0x80
	151	#define BPF_JA 0x00
	152	#define BPF_JEQ 0x10
	153	#define BPF_JGT 0x20
	154	#define BPF_JGE 0x30
	155	#define BPF_JSET 0x40
	156	#define BPF_SRC(code) ((code) & 0x08)
	157	#define BPF_K 0x00
	158	#define BPF_X 0x08
	159
	160	/* ret - BPF_K and BPF_X also apply */
	161	#define BPF_RVAL(code) ((code) & 0x18)
	162	#define BPF_A 0x10
11569edc	163
e6ce130c SM	164	/* misc */
	165	#define BPF_MISCOP(code) ((code) & 0xf8)
	166	#define BPF_TAX 0x00
	167	#define BPF_TXA 0x80
11569edc SM	168
	169	/*
	170	* The instruction data structure.
	171	*/
	172	struct bpf_insn {
	173	u_short code;
	174	u_char jt;
	175	u_char jf;
	176	long k;
	177	};
	178
	179	/*
e6ce130c	180	* Macros for insn array initializers.
11569edc	181	*/
e6ce130c SM	182	#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
e6ce130c SM	183	#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
11569edc SM	184
	185	#ifdef KERNEL
	186	extern u_int bpf_filter();
	187	extern void bpfattach();
	188	extern void bpf_tap();
	189	extern void bpf_mtap();
	190	#endif
	191
	192	/*
e6ce130c	193	* Number of scratch memory words (for BPF_LD\|BPF_MEM and BPF_ST).
11569edc SM	194	*/
11569edc SM	195	#define BPF_MEMWORDS 16
d9f44bf8	196