the etrax bootloader tools source was added on initial merge, it is now sitting on the acme site, source should not be in this folder

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7465 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 0 insertions, 1944 deletions

diff --git a/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/gencode.c b/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/gencode.c
deleted file mode 100644
index f3fc5a60fe..0000000000
--- a/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/gencode.c
+++ /dev/null
@@ -1,1944 +0,0 @@
-/*
- * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that: (1) source code distributions
- * retain the above copyright notice and this paragraph in its entirety, (2)
- * distributions including binary code include the above copyright notice and
- * this paragraph in its entirety in the documentation or other materials
- * provided with the distribution, and (3) all advertising materials mentioning
- * features or use of this software display the following acknowledgement:
- * ``This product includes software developed by the University of California,
- * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
- * the University nor the names of its contributors may be used to endorse
- * or promote products derived from this software without specific prior
- * written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /usr/local/cvs/linux/tools/build/e100boot/libpcap-0.4/gencode.c,v 1.1 1999/08/26 10:05:22 johana Exp $ (LBL)";
-#endif
-
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-
-#if __STDC__
-struct mbuf;
-struct rtentry;
-#endif
-
-#include <net/if.h>
-
-#include <netinet/in.h>
-#include <netinet/if_ether.h>
-
-#include <stdlib.h>
-#include <memory.h>
-#include <setjmp.h>
-#if __STDC__
-#include <stdarg.h>
-#else
-#include <varargs.h>
-#endif
-
-#include "pcap-int.h"
-
-#include "ethertype.h"
-#include "gencode.h"
-#include "ppp.h"
-#include <pcap-namedb.h>
-
-#include "gnuc.h"
-#ifdef HAVE_OS_PROTO_H
-#include "os-proto.h"
-#endif
-
-#define JMP(c) ((c)|BPF_JMP|BPF_K)
-
-/* Locals */
-static jmp_buf top_ctx;
-static pcap_t *bpf_pcap;
-
-/* XXX */
-#ifdef PCAP_FDDIPAD
-int	pcap_fddipad = PCAP_FDDIPAD;
-#else
-int	pcap_fddipad;
-#endif
-
-/* VARARGS */
-__dead void
-#if __STDC__
-bpf_error(const char *fmt, ...)
-#else
-bpf_error(fmt, va_alist)
-	const char *fmt;
-	va_dcl
-#endif
-{
-	va_list ap;
-
-#if __STDC__
-	va_start(ap, fmt);
-#else
-	va_start(ap);
-#endif
-	if (bpf_pcap != NULL)
-		(void)vsprintf(pcap_geterr(bpf_pcap), fmt, ap);
-	va_end(ap);
-	longjmp(top_ctx, 1);
-	/* NOTREACHED */
-}
-
-static void init_linktype(int);
-
-static int alloc_reg(void);
-static void free_reg(int);
-
-static struct block *root;
-
-/*
- * We divy out chunks of memory rather than call malloc each time so
- * we don't have to worry about leaking memory.  It's probably
- * not a big deal if all this memory was wasted but it this ever
- * goes into a library that would probably not be a good idea.
- */
-#define NCHUNKS 16
-#define CHUNK0SIZE 1024
-struct chunk {
-	u_int n_left;
-	void *m;
-};
-
-static struct chunk chunks[NCHUNKS];
-static int cur_chunk;
-
-static void *newchunk(u_int);
-static void freechunks(void);
-static inline struct block *new_block(int);
-static inline struct slist *new_stmt(int);
-static struct block *gen_retblk(int);
-static inline void syntax(void);
-
-static void backpatch(struct block *, struct block *);
-static void merge(struct block *, struct block *);
-static struct block *gen_cmp(u_int, u_int, bpf_int32);
-static struct block *gen_mcmp(u_int, u_int, bpf_int32, bpf_u_int32);
-static struct block *gen_bcmp(u_int, u_int, const u_char *);
-static struct block *gen_uncond(int);
-static inline struct block *gen_true(void);
-static inline struct block *gen_false(void);
-static struct block *gen_linktype(int);
-static struct block *gen_hostop(bpf_u_int32, bpf_u_int32, int, int, u_int, u_int);
-static struct block *gen_ehostop(const u_char *, int);
-static struct block *gen_fhostop(const u_char *, int);
-static struct block *gen_dnhostop(bpf_u_int32, int, u_int);
-static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int);
-static struct block *gen_gateway(const u_char *, bpf_u_int32 **, int, int);
-static struct block *gen_ipfrag(void);
-static struct block *gen_portatom(int, bpf_int32);
-struct block *gen_portop(int, int, int);
-static struct block *gen_port(int, int, int);
-static int lookup_proto(const char *, int);
-static struct block *gen_proto(int, int, int);
-static struct slist *xfer_to_x(struct arth *);
-static struct slist *xfer_to_a(struct arth *);
-static struct block *gen_len(int, int);
-
-static void *
-newchunk(n)
-	u_int n;
-{
-	struct chunk *cp;
-	int k, size;
-
-	/* XXX Round up to nearest long. */
-	n = (n + sizeof(long) - 1) & ~(sizeof(long) - 1);
-
-	cp = &chunks[cur_chunk];
-	if (n > cp->n_left) {
-		++cp, k = ++cur_chunk;
-		if (k >= NCHUNKS)
-			bpf_error("out of memory");
-		size = CHUNK0SIZE << k;
-		cp->m = (void *)malloc(size);
-		memset((char *)cp->m, 0, size);
-		cp->n_left = size;
-		if (n > size)
-			bpf_error("out of memory");
-	}
-	cp->n_left -= n;
-	return (void *)((char *)cp->m + cp->n_left);
-}
-
-static void
-freechunks()
-{
-	int i;
-
-	cur_chunk = 0;
-	for (i = 0; i < NCHUNKS; ++i)
-		if (chunks[i].m != NULL) {
-			free(chunks[i].m);
-			chunks[i].m = NULL;
-		}
-}
-
-/*
- * A strdup whose allocations are freed after code generation is over.
- */
-char *
-sdup(s)
-	register const char *s;
-{
-	int n = strlen(s) + 1;
-	char *cp = newchunk(n);
-
-	strcpy(cp, s);
-	return (cp);
-}
-
-static inline struct block *
-new_block(code)
-	int code;
-{
-	struct block *p;
-
-	p = (struct block *)newchunk(sizeof(*p));
-	p->s.code = code;
-	p->head = p;
-
-	return p;
-}
-
-static inline struct slist *
-new_stmt(code)
-	int code;
-{
-	struct slist *p;
-
-	p = (struct slist *)newchunk(sizeof(*p));
-	p->s.code = code;
-
-	return p;
-}
-
-static struct block *
-gen_retblk(v)
-	int v;
-{
-	struct block *b = new_block(BPF_RET|BPF_K);
-
-	b->s.k = v;
-	return b;
-}
-
-static inline void
-syntax()
-{
-	bpf_error("syntax error in filter expression");
-}
-
-static bpf_u_int32 netmask;
-static int snaplen;
-
-int
-pcap_compile(pcap_t *p, struct bpf_program *program,
-	     char *buf, int optimize, bpf_u_int32 mask)
-{
-	extern int n_errors;
-	int len;
-
-	n_errors = 0;
-	root = NULL;
-	bpf_pcap = p;
-	if (setjmp(top_ctx)) {
-		freechunks();
-		return (-1);
-	}
-
-	netmask = mask;
-	snaplen = pcap_snapshot(p);
-
-	lex_init(buf ? buf : "");
-	init_linktype(pcap_datalink(p));
-	(void)pcap_parse();
-
-	if (n_errors)
-		syntax();
-
-	if (root == NULL)
-		root = gen_retblk(snaplen);
-
-	if (optimize) {
-		bpf_optimize(&root);
-		if (root == NULL ||
-		    (root->s.code == (BPF_RET|BPF_K) && root->s.k == 0))
-			bpf_error("expression rejects all packets");
-	}
-	program->bf_insns = icode_to_fcode(root, &len);
-	program->bf_len = len;
-
-	freechunks();
-	return (0);
-}
-
-/*
- * Backpatch the blocks in 'list' to 'target'.  The 'sense' field indicates
- * which of the jt and jf fields has been resolved and which is a pointer
- * back to another unresolved block (or nil).  At least one of the fields
- * in each block is already resolved.
- */
-static void
-backpatch(list, target)
-	struct block *list, *target;
-{
-	struct block *next;
-
-	while (list) {
-		if (!list->sense) {
-			next = JT(list);
-			JT(list) = target;
-		} else {
-			next = JF(list);
-			JF(list) = target;
-		}
-		list = next;
-	}
-}
-
-/*
- * Merge the lists in b0 and b1, using the 'sense' field to indicate
- * which of jt and jf is the link.
- */
-static void
-merge(b0, b1)
-	struct block *b0, *b1;
-{
-	register struct block **p = &b0;
-
-	/* Find end of list. */
-	while (*p)
-		p = !((*p)->sense) ? &JT(*p) : &JF(*p);
-
-	/* Concatenate the lists. */
-	*p = b1;
-}
-
-void
-finish_parse(p)
-	struct block *p;
-{
-	backpatch(p, gen_retblk(snaplen));
-	p->sense = !p->sense;
-	backpatch(p, gen_retblk(0));
-	root = p->head;
-}
-
-void
-gen_and(b0, b1)
-	struct block *b0, *b1;
-{
-	backpatch(b0, b1->head);
-	b0->sense = !b0->sense;
-	b1->sense = !b1->sense;
-	merge(b1, b0);
-	b1->sense = !b1->sense;
-	b1->head = b0->head;
-}
-
-void
-gen_or(b0, b1)
-	struct block *b0, *b1;
-{
-	b0->sense = !b0->sense;
-	backpatch(b0, b1->head);
-	b0->sense = !b0->sense;
-	merge(b1, b0);
-	b1->head = b0->head;
-}
-
-void
-gen_not(b)
-	struct block *b;
-{
-	b->sense = !b->sense;
-}
-
-static struct block *
-gen_cmp(offset, size, v)
-	u_int offset, size;
-	bpf_int32 v;
-{
-	struct slist *s;
-	struct block *b;
-
-	s = new_stmt(BPF_LD|BPF_ABS|size);
-	s->s.k = offset;
-
-	b = new_block(JMP(BPF_JEQ));
-	b->stmts = s;
-	b->s.k = v;
-
-	return b;
-}
-
-static struct block *
-gen_mcmp(offset, size, v, mask)
-	u_int offset, size;
-	bpf_int32 v;
-	bpf_u_int32 mask;
-{
-	struct block *b = gen_cmp(offset, size, v);
-	struct slist *s;
-
-	if (mask != 0xffffffff) {
-		s = new_stmt(BPF_ALU|BPF_AND|BPF_K);
-		s->s.k = mask;
-		b->stmts->next = s;
-	}
-	return b;
-}
-
-static struct block *
-gen_bcmp(offset, size, v)
-	register u_int offset, size;
-	register const u_char *v;
-{
-	register struct block *b, *tmp;
-
-	b = NULL;
-	while (size >= 4) {
-		register const u_char *p = &v[size - 4];
-		bpf_int32 w = ((bpf_int32)p[0] << 24) |
-		    ((bpf_int32)p[1] << 16) | ((bpf_int32)p[2] << 8) | p[3];
-
-		tmp = gen_cmp(offset + size - 4, BPF_W, w);
-		if (b != NULL)
-			gen_and(b, tmp);
-		b = tmp;
-		size -= 4;
-	}
-	while (size >= 2) {
-		register const u_char *p = &v[size - 2];
-		bpf_int32 w = ((bpf_int32)p[0] << 8) | p[1];
-
-		tmp = gen_cmp(offset + size - 2, BPF_H, w);
-		if (b != NULL)
-			gen_and(b, tmp);
-		b = tmp;
-		size -= 2;
-	}
-	if (size > 0) {
-		tmp = gen_cmp(offset, BPF_B, (bpf_int32)v[0]);
-		if (b != NULL)
-			gen_and(b, tmp);
-		b = tmp;
-	}
-	return b;
-}
-
-/*
- * Various code constructs need to know the layout of the data link
- * layer.  These variables give the necessary offsets.  off_linktype
- * is set to -1 for no encapsulation, in which case, IP is assumed.
- */
-static u_int off_linktype;
-static u_int off_nl;
-static int linktype;
-
-static void
-init_linktype(type)
-	int type;
-{
-	linktype = type;
-
-	switch (type) {
-
-	case DLT_EN10MB:
-		off_linktype = 12;
-		off_nl = 14;
-		return;
-
-	case DLT_SLIP:
-		/*
-		 * SLIP doesn't have a link level type.  The 16 byte
-		 * header is hacked into our SLIP driver.
-		 */
-		off_linktype = -1;
-		off_nl = 16;
-		return;
-
-	case DLT_SLIP_BSDOS:
-		/* XXX this may be the same as the DLT_PPP_BSDOS case */
-		off_linktype = -1;
-		/* XXX end */
-		off_nl = 24;
-		return;
-
-	case DLT_NULL:
-		off_linktype = 0;
-		off_nl = 4;
-		return;
-
-	case DLT_PPP:
-		off_linktype = 2;
-		off_nl = 4;
-		return;
-
-	case DLT_PPP_BSDOS:
-		off_linktype = 5;
-		off_nl = 24;
-		return;
-
-	case DLT_FDDI:
-		/*
-		 * FDDI doesn't really have a link-level type field.
-		 * We assume that SSAP = SNAP is being used and pick
-		 * out the encapsulated Ethernet type.
-		 */
-		off_linktype = 19;
-#ifdef PCAP_FDDIPAD
-		off_linktype += pcap_fddipad;
-#endif
-		off_nl = 21;
-#ifdef PCAP_FDDIPAD
-		off_nl += pcap_fddipad;
-#endif
-		return;
-
-	case DLT_IEEE802:
-		off_linktype = 20;
-		off_nl = 22;
-		return;
-
-	case DLT_ATM_RFC1483:
-		/*
-		 * assume routed, non-ISO PDUs
-		 * (i.e., LLC = 0xAA-AA-03, OUT = 0x00-00-00)
-		 */
-		off_linktype = 6;
-		off_nl = 8;
-		return;
-
-	case DLT_RAW:
-		off_linktype = -1;
-		off_nl = 0;
-		return;
-	}
-	bpf_error("unknown data link type 0x%x", linktype);
-	/* NOTREACHED */
-}
-
-static struct block *
-gen_uncond(rsense)
-	int rsense;
-{
-	struct block *b;
-	struct slist *s;
-
-	s = new_stmt(BPF_LD|BPF_IMM);
-	s->s.k = !rsense;
-	b = new_block(JMP(BPF_JEQ));
-	b->stmts = s;
-
-	return b;
-}
-
-static inline struct block *
-gen_true()
-{
-	return gen_uncond(1);
-}
-
-static inline struct block *
-gen_false()
-{
-	return gen_uncond(0);
-}
-
-static struct block *
-gen_linktype(proto)
-	register int proto;
-{
-	struct block *b0, *b1;
-
-	/* If we're not using encapsulation and checking for IP, we're done */
-	if (off_linktype == -1 && proto == ETHERTYPE_IP)
-		return gen_true();
-
-	switch (linktype) {
-
-	case DLT_SLIP:
-		return gen_false();
-
-	case DLT_PPP:
-		if (proto == ETHERTYPE_IP)
-			proto = PPP_IP;			/* XXX was 0x21 */
-		break;
-
-	case DLT_PPP_BSDOS:
-		switch (proto) {
-
-		case ETHERTYPE_IP:
-			b0 = gen_cmp(off_linktype, BPF_H, PPP_IP);
-			b1 = gen_cmp(off_linktype, BPF_H, PPP_VJC);
-			gen_or(b0, b1);
-			b0 = gen_cmp(off_linktype, BPF_H, PPP_VJNC);
-			gen_or(b1, b0);
-			return b0;
-
-		case ETHERTYPE_DN:
-			proto = PPP_DECNET;
-			break;
-
-		case ETHERTYPE_ATALK:
-			proto = PPP_APPLE;
-			break;
-
-		case ETHERTYPE_NS:
-			proto = PPP_NS;
-			break;
-		}
-		break;
-
-	case DLT_NULL:
-		/* XXX */
-		if (proto == ETHERTYPE_IP)
-			return (gen_cmp(0, BPF_W, (bpf_int32)htonl(AF_INET)));
-		else
-			return gen_false();
-	}
-	return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
-}
-
-static struct block *
-gen_hostop(addr, mask, dir, proto, src_off, dst_off)
-	bpf_u_int32 addr;
-	bpf_u_int32 mask;
-	int dir, proto;
-	u_int src_off, dst_off;
-{
-	struct block *b0, *b1;
-	u_int offset;
-
-	switch (dir) {
-
-	case Q_SRC:
-		offset = src_off;
-		break;
-
-	case Q_DST:
-		offset = dst_off;
-		break;
-
-	case Q_AND:
-		b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off);
-		b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off);
-		gen_and(b0, b1);
-		return b1;
-
-	case Q_OR:
-	case Q_DEFAULT:
-		b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off);
-		b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off);
-		gen_or(b0, b1);
-		return b1;
-
-	default:
-		abort();
-	}
-	b0 = gen_linktype(proto);
-	b1 = gen_mcmp(offset, BPF_W, (bpf_int32)addr, mask);
-	gen_and(b0, b1);
-	return b1;
-}
-
-static struct block *
-gen_ehostop(eaddr, dir)
-	register const u_char *eaddr;
-	register int dir;
-{
-	register struct block *b0, *b1;
-
-	switch (dir) {
-	case Q_SRC:
-		return gen_bcmp(6, 6, eaddr);
-
-	case Q_DST:
-		return gen_bcmp(0, 6, eaddr);
-
-	case Q_AND:
-		b0 = gen_ehostop(eaddr, Q_SRC);
-		b1 = gen_ehostop(eaddr, Q_DST);
-		gen_and(b0, b1);
-		return b1;
-
-	case Q_DEFAULT:
-	case Q_OR:
-		b0 = gen_ehostop(eaddr, Q_SRC);
-		b1 = gen_ehostop(eaddr, Q_DST);
-		gen_or(b0, b1);
-		return b1;
-	}
-	abort();
-	/* NOTREACHED */
-}
-
-/*
- * Like gen_ehostop, but for DLT_FDDI
- */
-static struct block *
-gen_fhostop(eaddr, dir)
-	register const u_char *eaddr;
-	register int dir;
-{
-	struct block *b0, *b1;
-
-	switch (dir) {
-	case Q_SRC:
-#ifdef PCAP_FDDIPAD
-		return gen_bcmp(6 + 1 + pcap_fddipad, 6, eaddr);
-#else
-		return gen_bcmp(6 + 1, 6, eaddr);
-#endif
-
-	case Q_DST:
-#ifdef PCAP_FDDIPAD
-		return gen_bcmp(0 + 1 + pcap_fddipad, 6, eaddr);
-#else
-		return gen_bcmp(0 + 1, 6, eaddr);
-#endif
-
-	case Q_AND:
-		b0 = gen_fhostop(eaddr, Q_SRC);
-		b1 = gen_fhostop(eaddr, Q_DST);
-		gen_and(b0, b1);
-		return b1;
-
-	case Q_DEFAULT:
-	case Q_OR:
-		b0 = gen_fhostop(eaddr, Q_SRC);
-		b1 = gen_fhostop(eaddr, Q_DST);
-		gen_or(b0, b1);
-		return b1;
-	}
-	abort();
-	/* NOTREACHED */
-}
-
-/*
- * This is quite tricky because there may be pad bytes in front of the
- * DECNET header, and then there are two possible data packet formats that
- * carry both src and dst addresses, plus 5 packet types in a format that
- * carries only the src node, plus 2 types that use a different format and
- * also carry just the src node.
- *
- * Yuck.
- *
- * Instead of doing those all right, we just look for data packets with
- * 0 or 1 bytes of padding.  If you want to look at other packets, that
- * will require a lot more hacking.
- *
- * To add support for filtering on DECNET "areas" (network numbers)
- * one would want to add a "mask" argument to this routine.  That would
- * make the filter even more inefficient, although one could be clever
- * and not generate masking instructions if the mask is 0xFFFF.
- */
-static struct block *
-gen_dnhostop(addr, dir, base_off)
-	bpf_u_int32 addr;
-	int dir;
-	u_int base_off;
-{
-	struct block *b0, *b1, *b2, *tmp;
-	u_int offset_lh;	/* offset if long header is received */
-	u_int offset_sh;	/* offset if short header is received */
-
-	switch (dir) {
-
-	case Q_DST:
-		offset_sh = 1;	/* follows flags */
-		offset_lh = 7;	/* flgs,darea,dsubarea,HIORD */
-		break;
-
-	case Q_SRC:
-		offset_sh = 3;	/* follows flags, dstnode */
-		offset_lh = 15;	/* flgs,darea,dsubarea,did,sarea,ssub,HIORD */
-		break;
-
-	case Q_AND:
-		/* Inefficient because we do our Calvinball dance twice */
-		b0 = gen_dnhostop(addr, Q_SRC, base_off);
-		b1 = gen_dnhostop(addr, Q_DST, base_off);
-		gen_and(b0, b1);
-		return b1;
-
-	case Q_OR:
-	case Q_DEFAULT:
-		/* Inefficient because we do our Calvinball dance twice */
-		b0 = gen_dnhostop(addr, Q_SRC, base_off);
-		b1 = gen_dnhostop(addr, Q_DST, base_off);
-		gen_or(b0, b1);
-		return b1;
-
-	default:
-		abort();
-	}
-	b0 = gen_linktype(ETHERTYPE_DN);
-	/* Check for pad = 1, long header case */
-	tmp = gen_mcmp(base_off + 2, BPF_H,
-	    (bpf_int32)ntohs(0x0681), (bpf_int32)ntohs(0x07FF));
-	b1 = gen_cmp(base_off + 2 + 1 + offset_lh,
-	    BPF_H, (bpf_int32)ntohs(addr));
-	gen_and(tmp, b1);
-	/* Check for pad = 0, long header case */
-	tmp = gen_mcmp(base_off + 2, BPF_B, (bpf_int32)0x06, (bpf_int32)0x7);
-	b2 = gen_cmp(base_off + 2 + offset_lh, BPF_H, (bpf_int32)ntohs(addr));
-	gen_and(tmp, b2);
-	gen_or(b2, b1);
-	/* Check for pad = 1, short header case */
-	tmp = gen_mcmp(base_off + 2, BPF_H,
-	    (bpf_int32)ntohs(0x0281), (bpf_int32)ntohs(0x07FF));
-	b2 = gen_cmp(base_off + 2 + 1 + offset_sh,
-	    BPF_H, (bpf_int32)ntohs(addr));
-	gen_and(tmp, b2);
-	gen_or(b2, b1);
-	/* Check for pad = 0, short header case */
-	tmp = gen_mcmp(base_off + 2, BPF_B, (bpf_int32)0x02, (bpf_int32)0x7);
-	b2 = gen_cmp(base_off + 2 + offset_sh, BPF_H, (bpf_int32)ntohs(addr));
-	gen_and(tmp, b2);
-	gen_or(b2, b1);
-
-	/* Combine with test for linktype */
-	gen_and(b0, b1);
-	return b1;
-}
-
-static struct block *
-gen_host(addr, mask, proto, dir)
-	bpf_u_int32 addr;
-	bpf_u_int32 mask;
-	int proto;
-	int dir;
-{
-	struct block *b0, *b1;
-
-	switch (proto) {
-
-	case Q_DEFAULT:
-		b0 = gen_host(addr, mask, Q_IP, dir);
-		b1 = gen_host(addr, mask, Q_ARP, dir);
-		gen_or(b0, b1);
-		b0 = gen_host(addr, mask, Q_RARP, dir);
-		gen_or(b1, b0);
-		return b0;
-
-	case Q_IP:
-		return gen_hostop(addr, mask, dir, ETHERTYPE_IP,
-				  off_nl + 12, off_nl + 16);
-
-	case Q_RARP:
-		return gen_hostop(addr, mask, dir, ETHERTYPE_REVARP,
-				  off_nl + 14, off_nl + 24);
-
-	case Q_ARP:
-		return gen_hostop(addr, mask, dir, ETHERTYPE_ARP,
-				  off_nl + 14, off_nl + 24);
-
-	case Q_TCP:
-		bpf_error("'tcp' modifier applied to host");
-
-	case Q_UDP:
-		bpf_error("'udp' modifier applied to host");
-
-	case Q_ICMP:
-		bpf_error("'icmp' modifier applied to host");
-
-	case Q_IGMP:
-		bpf_error("'igmp' modifier applied to host");
-
-	case Q_IGRP:
-		bpf_error("'igrp' modifier applied to host");
-
-	case Q_ATALK:
-		bpf_error("ATALK host filtering not implemented");
-
-	case Q_DECNET:
-		return gen_dnhostop(addr, dir, off_nl);
-
-	case Q_SCA:
-		bpf_error("SCA host filtering not implemented");
-
-	case Q_LAT:
-		bpf_error("LAT host filtering not implemented");
-
-	case Q_MOPDL:
-		bpf_error("MOPDL host filtering not implemented");
-
-	case Q_MOPRC:
-		bpf_error("MOPRC host filtering not implemented");
-
-	default:
-		abort();
-	}
-	/* NOTREACHED */
-}
-
-static struct block *
-gen_gateway(eaddr, alist, proto, dir)
-	const u_char *eaddr;
-	bpf_u_int32 **alist;
-	int proto;
-	int dir;
-{
-	struct block *b0, *b1, *tmp;
-
-	if (dir != 0)
-		bpf_error("direction applied to 'gateway'");
-
-	switch (proto) {
-	case Q_DEFAULT:
-	case Q_IP:
-	case Q_ARP:
-	case Q_RARP:
-		if (linktype == DLT_EN10MB)
-			b0 = gen_ehostop(eaddr, Q_OR);
-		else if (linktype == DLT_FDDI)
-			b0 = gen_fhostop(eaddr, Q_OR);
-		else
-			bpf_error(
-			    "'gateway' supported only on ethernet or FDDI");
-
-		b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR);
-		while (*alist) {
-			tmp = gen_host(**alist++, 0xffffffff, proto, Q_OR);
-			gen_or(b1, tmp);
-			b1 = tmp;
-		}
-		gen_not(b1);
-		gen_and(b0, b1);
-		return b1;
-	}
-	bpf_error("illegal modifier of 'gateway'");
-	/* NOTREACHED */
-}
-
-struct block *
-gen_proto_abbrev(proto)
-	int proto;
-{
-	struct block *b0, *b1;
-
-	switch (proto) {
-
-	case Q_TCP:
-		b0 = gen_linktype(ETHERTYPE_IP);
-		b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)IPPROTO_TCP);
-		gen_and(b0, b1);
-		break;
-
-	case Q_UDP:
-		b0 =  gen_linktype(ETHERTYPE_IP);
-		b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)IPPROTO_UDP);
-		gen_and(b0, b1);
-		break;
-
-	case Q_ICMP:
-		b0 =  gen_linktype(ETHERTYPE_IP);
-		b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)IPPROTO_ICMP);
-		gen_and(b0, b1);
-		break;
-
-	case Q_IGMP:
-		b0 =  gen_linktype(ETHERTYPE_IP);
-		b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)2);
-		gen_and(b0, b1);
-		break;
-
-#ifndef	IPPROTO_IGRP
-#define	IPPROTO_IGRP	9
-#endif
-	case Q_IGRP:
-		b0 =  gen_linktype(ETHERTYPE_IP);
-		b1 = gen_cmp(off_nl + 9, BPF_B, (long)IPPROTO_IGRP);
-		gen_and(b0, b1);
-		break;
-
-	case Q_IP:
-		b1 =  gen_linktype(ETHERTYPE_IP);
-		break;
-
-	case Q_ARP:
-		b1 =  gen_linktype(ETHERTYPE_ARP);
-		break;
-
-	case Q_RARP:
-		b1 =  gen_linktype(ETHERTYPE_REVARP);
-		break;
-
-	case Q_LINK:
-		bpf_error("link layer applied in wrong context");
-
-	case Q_ATALK:
-		b1 =  gen_linktype(ETHERTYPE_ATALK);
-		break;
-
-	case Q_DECNET:
-		b1 =  gen_linktype(ETHERTYPE_DN);
-		break;
-
-	case Q_SCA:
-		b1 =  gen_linktype(ETHERTYPE_SCA);
-		break;
-
-	case Q_LAT:
-		b1 =  gen_linktype(ETHERTYPE_LAT);
-		break;
-
-	case Q_MOPDL:
-		b1 =  gen_linktype(ETHERTYPE_MOPDL);
-		break;
-
-	case Q_MOPRC:
-		b1 =  gen_linktype(ETHERTYPE_MOPRC);
-		break;
-
-	default:
-		abort();
-	}
-	return b1;
-}
-
-static struct block *
-gen_ipfrag()
-{
-	struct slist *s;
-	struct block *b;
-
-	/* not ip frag */
-	s = new_stmt(BPF_LD|BPF_H|BPF_ABS);
-	s->s.k = off_nl + 6;
-	b = new_block(JMP(BPF_JSET));
-	b->s.k = 0x1fff;
-	b->stmts = s;
-	gen_not(b);
-
-	return b;
-}
-
-static struct block *
-gen_portatom(off, v)
-	int off;
-	bpf_int32 v;
-{
-	struct slist *s;
-	struct block *b;
-
-	s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
-	s->s.k = off_nl;
-
-	s->next = new_stmt(BPF_LD|BPF_IND|BPF_H);
-	s->next->s.k = off_nl + off;
-
-	b = new_block(JMP(BPF_JEQ));
-	b->stmts = s;
-	b->s.k = v;
-
-	return b;
-}
-
-struct block *
-gen_portop(port, proto, dir)
-	int port, proto, dir;
-{
-	struct block *b0, *b1, *tmp;
-
-	/* ip proto 'proto' */
-	tmp = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)proto);
-	b0 = gen_ipfrag();
-	gen_and(tmp, b0);
-
-	switch (dir) {
-	case Q_SRC:
-		b1 = gen_portatom(0, (bpf_int32)port);
-		break;
-
-	case Q_DST:
-		b1 = gen_portatom(2, (bpf_int32)port);
-		break;
-
-	case Q_OR:
-	case Q_DEFAULT:
-		tmp = gen_portatom(0, (bpf_int32)port);
-		b1 = gen_portatom(2, (bpf_int32)port);
-		gen_or(tmp, b1);
-		break;
-
-	case Q_AND:
-		tmp = gen_portatom(0, (bpf_int32)port);
-		b1 = gen_portatom(2, (bpf_int32)port);
-		gen_and(tmp, b1);
-		break;
-
-	default:
-		abort();
-	}
-	gen_and(b0, b1);
-
-	return b1;
-}
-
-static struct block *
-gen_port(port, ip_proto, dir)
-	int port;
-	int ip_proto;
-	int dir;
-{
-	struct block *b0, *b1, *tmp;
-
-	/* ether proto ip */
-	b0 =  gen_linktype(ETHERTYPE_IP);
-
-	switch (ip_proto) {
-	case IPPROTO_UDP:
-	case IPPROTO_TCP:
-		b1 = gen_portop(port, ip_proto, dir);
-		break;
-
-	case PROTO_UNDEF:
-		tmp = gen_portop(port, IPPROTO_TCP, dir);
-		b1 = gen_portop(port, IPPROTO_UDP, dir);
-		gen_or(tmp, b1);
-		break;
-
-	default:
-		abort();
-	}
-	gen_and(b0, b1);
-	return b1;
-}
-
-static int
-lookup_proto(name, proto)
-	register const char *name;
-	register int proto;
-{
-	register int v;
-
-	switch (proto) {
-
-	case Q_DEFAULT:
-	case Q_IP:
-		v = pcap_nametoproto(name);
-		if (v == PROTO_UNDEF)
-			bpf_error("unknown ip proto '%s'", name);
-		break;
-
-	case Q_LINK:
-		/* XXX should look up h/w protocol type based on linktype */
-		v = pcap_nametoeproto(name);
-		if (v == PROTO_UNDEF)
-			bpf_error("unknown ether proto '%s'", name);
-		break;
-
-	default:
-		v = PROTO_UNDEF;
-		break;
-	}
-	return v;
-}
-
-static struct block *
-gen_proto(v, proto, dir)
-	int v;
-	int proto;
-	int dir;
-{
-	struct block *b0, *b1;
-
-	if (dir != Q_DEFAULT)
-		bpf_error("direction applied to 'proto'");
-
-	switch (proto) {
-	case Q_DEFAULT:
-	case Q_IP:
-		b0 = gen_linktype(ETHERTYPE_IP);
-		b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)v);
-		gen_and(b0, b1);
-		return b1;
-
-	case Q_ARP:
-		bpf_error("arp does not encapsulate another protocol");
-		/* NOTREACHED */
-
-	case Q_RARP:
-		bpf_error("rarp does not encapsulate another protocol");
-		/* NOTREACHED */
-
-	case Q_ATALK:
-		bpf_error("atalk encapsulation is not specifiable");
-		/* NOTREACHED */
-
-	case Q_DECNET:
-		bpf_error("decnet encapsulation is not specifiable");
-		/* NOTREACHED */
-
-	case Q_SCA:
-		bpf_error("sca does not encapsulate another protocol");
-		/* NOTREACHED */
-
-	case Q_LAT:
-		bpf_error("lat does not encapsulate another protocol");
-		/* NOTREACHED */
-
-	case Q_MOPRC:
-		bpf_error("moprc does not encapsulate another protocol");
-		/* NOTREACHED */
-
-	case Q_MOPDL:
-		bpf_error("mopdl does not encapsulate another protocol");
-		/* NOTREACHED */
-
-	case Q_LINK:
-		return gen_linktype(v);
-
-	case Q_UDP:
-		bpf_error("'udp proto' is bogus");
-		/* NOTREACHED */
-
-	case Q_TCP:
-		bpf_error("'tcp proto' is bogus");
-		/* NOTREACHED */
-
-	case Q_ICMP:
-		bpf_error("'icmp proto' is bogus");
-		/* NOTREACHED */
-
-	case Q_IGMP:
-		bpf_error("'igmp proto' is bogus");
-		/* NOTREACHED */
-
-	case Q_IGRP:
-		bpf_error("'igrp proto' is bogus");
-		/* NOTREACHED */
-
-	default:
-		abort();
-		/* NOTREACHED */
-	}
-	/* NOTREACHED */
-}
-
-struct block *
-gen_scode(name, q)
-	register const char *name;
-	struct qual q;
-{
-	int proto = q.proto;
-	int dir = q.dir;
-	int tproto;
-	u_char *eaddr;
-	bpf_u_int32 mask, addr, **alist;
-	struct block *b, *tmp;
-	int port, real_proto;
-
-	switch (q.addr) {
-
-	case Q_NET:
-		addr = pcap_nametonetaddr(name);
-		if (addr == 0)
-			bpf_error("unknown network '%s'", name);
-		/* Left justify network addr and calculate its network mask */
-		mask = 0xffffffff;
-		while (addr && (addr & 0xff000000) == 0) {
-			addr <<= 8;
-			mask <<= 8;
-		}
-		return gen_host(addr, mask, proto, dir);
-
-	case Q_DEFAULT:
-	case Q_HOST:
-		if (proto == Q_LINK) {
-			switch (linktype) {
-
-			case DLT_EN10MB:
-				eaddr = pcap_ether_hostton(name);
-				if (eaddr == NULL)
-					bpf_error(
-					    "unknown ether host '%s'", name);
-				return gen_ehostop(eaddr, dir);
-
-			case DLT_FDDI:
-				eaddr = pcap_ether_hostton(name);
-				if (eaddr == NULL)
-					bpf_error(
-					    "unknown FDDI host '%s'", name);
-				return gen_fhostop(eaddr, dir);
-
-			default:
-				bpf_error(
-			"only ethernet/FDDI supports link-level host name");
-				break;
-			}
-		} else if (proto == Q_DECNET) {
-			unsigned short dn_addr = __pcap_nametodnaddr(name);
-			/*
-			 * I don't think DECNET hosts can be multihomed, so
-			 * there is no need to build up a list of addresses
-			 */
-			return (gen_host(dn_addr, 0, proto, dir));
-		} else {
-			alist = pcap_nametoaddr(name);
-			if (alist == NULL || *alist == NULL)
-				bpf_error("unknown host '%s'", name);
-			tproto = proto;
-			if (off_linktype == -1 && tproto == Q_DEFAULT)
-				tproto = Q_IP;
-			b = gen_host(**alist++, 0xffffffff, tproto, dir);
-			while (*alist) {
-				tmp = gen_host(**alist++, 0xffffffff,
-					       tproto, dir);
-				gen_or(b, tmp);
-				b = tmp;
-			}
-			return b;
-		}
-
-	case Q_PORT:
-		if (proto != Q_DEFAULT && proto != Q_UDP && proto != Q_TCP)
-			bpf_error("illegal qualifier of 'port'");
-		if (pcap_nametoport(name, &port, &real_proto) == 0)
-			bpf_error("unknown port '%s'", name);
-		if (proto == Q_UDP) {
-			if (real_proto == IPPROTO_TCP)
-				bpf_error("port '%s' is tcp", name);
-			else
-				/* override PROTO_UNDEF */
-				real_proto = IPPROTO_UDP;
-		}
-		if (proto == Q_TCP) {
-			if (real_proto == IPPROTO_UDP)
-				bpf_error("port '%s' is udp", name);
-			else
-				/* override PROTO_UNDEF */
-				real_proto = IPPROTO_TCP;
-		}
-		return gen_port(port, real_proto, dir);
-
-	case Q_GATEWAY:
-		eaddr = pcap_ether_hostton(name);
-		if (eaddr == NULL)
-			bpf_error("unknown ether host: %s", name);
-
-		alist = pcap_nametoaddr(name);
-		if (alist == NULL || *alist == NULL)
-			bpf_error("unknown host '%s'", name);
-		return gen_gateway(eaddr, alist, proto, dir);
-
-	case Q_PROTO:
-		real_proto = lookup_proto(name, proto);
-		if (real_proto >= 0)
-			return gen_proto(real_proto, proto, dir);
-		else
-			bpf_error("unknown protocol: %s", name);
-
-	case Q_UNDEF:
-		syntax();
-		/* NOTREACHED */
-	}
-	abort();
-	/* NOTREACHED */
-}
-
-struct block *
-gen_mcode(s1, s2, masklen, q)
-	register const char *s1, *s2;
-	register int masklen;
-	struct qual q;
-{
-	register int nlen, mlen;
-	bpf_u_int32 n, m;
-
-	nlen = __pcap_atoin(s1, &n);
-	/* Promote short ipaddr */
-	n <<= 32 - nlen;
-
-	if (s2 != NULL) {
-		mlen = __pcap_atoin(s2, &m);
-		/* Promote short ipaddr */
-		m <<= 32 - mlen;
-		if ((n & ~m) != 0)
-			bpf_error("non-network bits set in \"%s mask %s\"",
-			    s1, s2);
-	} else {
-		/* Convert mask len to mask */
-		if (masklen > 32)
-			bpf_error("mask length must be <= 32");
-		m = 0xffffffff << (32 - masklen);
-		if ((n & ~m) != 0)
-			bpf_error("non-network bits set in \"%s/%d\"",
-			    s1, masklen);
-	}
-
-	switch (q.addr) {
-
-	case Q_NET:
-		return gen_host(n, m, q.proto, q.dir);
-
-	default:
-		bpf_error("Mask syntax for networks only");
-		/* NOTREACHED */
-	}
-}
-
-struct block *
-gen_ncode(s, v, q)
-	register const char *s;
-	bpf_u_int32 v;
-	struct qual q;
-{
-	bpf_u_int32 mask;
-	int proto = q.proto;
-	int dir = q.dir;
-	register int vlen;
-
-	if (s == NULL)
-		vlen = 32;
-	else if (q.proto == Q_DECNET)
-		vlen = __pcap_atodn(s, &v);
-	else
-		vlen = __pcap_atoin(s, &v);
-
-	switch (q.addr) {
-
-	case Q_DEFAULT:
-	case Q_HOST:
-	case Q_NET:
-		if (proto == Q_DECNET)
-			return gen_host(v, 0, proto, dir);
-		else if (proto == Q_LINK) {
-			bpf_error("illegal link layer address");
-		} else {
-			mask = 0xffffffff;
-			if (s == NULL && q.addr == Q_NET) {
-				/* Promote short net number */
-				while (v && (v & 0xff000000) == 0) {
-					v <<= 8;
-					mask <<= 8;
-				}
-			} else {
-				/* Promote short ipaddr */
-				v <<= 32 - vlen;
-				mask <<= 32 - vlen;
-			}
-			return gen_host(v, mask, proto, dir);
-		}
-
-	case Q_PORT:
-		if (proto == Q_UDP)
-			proto = IPPROTO_UDP;
-		else if (proto == Q_TCP)
-			proto = IPPROTO_TCP;
-		else if (proto == Q_DEFAULT)
-			proto = PROTO_UNDEF;
-		else
-			bpf_error("illegal qualifier of 'port'");
-
-		return gen_port((int)v, proto, dir);
-
-	case Q_GATEWAY:
-		bpf_error("'gateway' requires a name");
-		/* NOTREACHED */
-
-	case Q_PROTO:
-		return gen_proto((int)v, proto, dir);
-
-	case Q_UNDEF:
-		syntax();
-		/* NOTREACHED */
-
-	default:
-		abort();
-		/* NOTREACHED */
-	}
-	/* NOTREACHED */
-}
-
-struct block *
-gen_ecode(eaddr, q)
-	register const u_char *eaddr;
-	struct qual q;
-{
-	if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) && q.proto == Q_LINK) {
-		if (linktype == DLT_EN10MB)
-			return gen_ehostop(eaddr, (int)q.dir);
-		if (linktype == DLT_FDDI)
-			return gen_fhostop(eaddr, (int)q.dir);
-	}
-	bpf_error("ethernet address used in non-ether expression");
-	/* NOTREACHED */
-}
-
-void
-sappend(s0, s1)
-	struct slist *s0, *s1;
-{
-	/*
-	 * This is definitely not the best way to do this, but the
-	 * lists will rarely get long.
-	 */
-	while (s0->next)
-		s0 = s0->next;
-	s0->next = s1;
-}
-
-static struct slist *
-xfer_to_x(a)
-	struct arth *a;
-{
-	struct slist *s;
-
-	s = new_stmt(BPF_LDX|BPF_MEM);
-	s->s.k = a->regno;
-	return s;
-}
-
-static struct slist *
-xfer_to_a(a)
-	struct arth *a;
-{
-	struct slist *s;
-
-	s = new_stmt(BPF_LD|BPF_MEM);
-	s->s.k = a->regno;
-	return s;
-}
-
-struct arth *
-gen_load(proto, index, size)
-	int proto;
-	struct arth *index;
-	int size;
-{
-	struct slist *s, *tmp;
-	struct block *b;
-	int regno = alloc_reg();
-
-	free_reg(index->regno);
-	switch (size) {
-
-	default:
-		bpf_error("data size must be 1, 2, or 4");
-
-	case 1:
-		size = BPF_B;
-		break;
-
-	case 2:
-		size = BPF_H;
-		break;
-
-	case 4:
-		size = BPF_W;
-		break;
-	}
-	switch (proto) {
-	default:
-		bpf_error("unsupported index operation");
-
-	case Q_LINK:
-		s = xfer_to_x(index);
-		tmp = new_stmt(BPF_LD|BPF_IND|size);
-		sappend(s, tmp);
-		sappend(index->s, s);
-		break;
-
-	case Q_IP:
-	case Q_ARP:
-	case Q_RARP:
-	case Q_ATALK:
-	case Q_DECNET:
-	case Q_SCA:
-	case Q_LAT:
-	case Q_MOPRC:
-	case Q_MOPDL:
-		/* XXX Note that we assume a fixed link link header here. */
-		s = xfer_to_x(index);
-		tmp = new_stmt(BPF_LD|BPF_IND|size);
-		tmp->s.k = off_nl;
-		sappend(s, tmp);
-		sappend(index->s, s);
-
-		b = gen_proto_abbrev(proto);
-		if (index->b)
-			gen_and(index->b, b);
-		index->b = b;
-		break;
-
-	case Q_TCP:
-	case Q_UDP:
-	case Q_ICMP:
-	case Q_IGMP:
-	case Q_IGRP:
-		s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
-		s->s.k = off_nl;
-		sappend(s, xfer_to_a(index));
-		sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
-		sappend(s, new_stmt(BPF_MISC|BPF_TAX));
-		sappend(s, tmp = new_stmt(BPF_LD|BPF_IND|size));
-		tmp->s.k = off_nl;
-		sappend(index->s, s);
-
-		gen_and(gen_proto_abbrev(proto), b = gen_ipfrag());
-		if (index->b)
-			gen_and(index->b, b);
-		index->b = b;
-		break;
-	}
-	index->regno = regno;
-	s = new_stmt(BPF_ST);
-	s->s.k = regno;
-	sappend(index->s, s);
-
-	return index;
-}
-
-struct block *
-gen_relation(code, a0, a1, reversed)
-	int code;
-	struct arth *a0, *a1;
-	int reversed;
-{
-	struct slist *s0, *s1, *s2;
-	struct block *b, *tmp;
-
-	s0 = xfer_to_x(a1);
-	s1 = xfer_to_a(a0);
-	s2 = new_stmt(BPF_ALU|BPF_SUB|BPF_X);
-	b = new_block(JMP(code));
-	if (code == BPF_JGT || code == BPF_JGE) {
-		reversed = !reversed;
-		b->s.k = 0x80000000;
-	}
-	if (reversed)
-		gen_not(b);
-
-	sappend(s1, s2);
-	sappend(s0, s1);
-	sappend(a1->s, s0);
-	sappend(a0->s, a1->s);
-
-	b->stmts = a0->s;
-
-	free_reg(a0->regno);
-	free_reg(a1->regno);
-
-	/* 'and' together protocol checks */
-	if (a0->b) {
-		if (a1->b) {
-			gen_and(a0->b, tmp = a1->b);
-		}
-		else
-			tmp = a0->b;
-	} else
-		tmp = a1->b;
-
-	if (tmp)
-		gen_and(tmp, b);
-
-	return b;
-}
-
-struct arth *
-gen_loadlen()
-{
-	int regno = alloc_reg();
-	struct arth *a = (struct arth *)newchunk(sizeof(*a));
-	struct slist *s;
-
-	s = new_stmt(BPF_LD|BPF_LEN);
-	s->next = new_stmt(BPF_ST);
-	s->next->s.k = regno;
-	a->s = s;
-	a->regno = regno;
-
-	return a;
-}
-
-struct arth *
-gen_loadi(val)
-	int val;
-{
-	struct arth *a;
-	struct slist *s;
-	int reg;
-
-	a = (struct arth *)newchunk(sizeof(*a));
-
-	reg = alloc_reg();
-
-	s = new_stmt(BPF_LD|BPF_IMM);
-	s->s.k = val;
-	s->next = new_stmt(BPF_ST);
-	s->next->s.k = reg;
-	a->s = s;
-	a->regno = reg;
-
-	return a;
-}
-
-struct arth *
-gen_neg(a)
-	struct arth *a;
-{
-	struct slist *s;
-
-	s = xfer_to_a(a);
-	sappend(a->s, s);
-	s = new_stmt(BPF_ALU|BPF_NEG);
-	s->s.k = 0;
-	sappend(a->s, s);
-	s = new_stmt(BPF_ST);
-	s->s.k = a->regno;
-	sappend(a->s, s);
-
-	return a;
-}
-
-struct arth *
-gen_arth(code, a0, a1)
-	int code;
-	struct arth *a0, *a1;
-{
-	struct slist *s0, *s1, *s2;
-
-	s0 = xfer_to_x(a1);
-	s1 = xfer_to_a(a0);
-	s2 = new_stmt(BPF_ALU|BPF_X|code);
-
-	sappend(s1, s2);
-	sappend(s0, s1);
-	sappend(a1->s, s0);
-	sappend(a0->s, a1->s);
-
-	free_reg(a1->regno);
-
-	s0 = new_stmt(BPF_ST);
-	a0->regno = s0->s.k = alloc_reg();
-	sappend(a0->s, s0);
-
-	return a0;
-}
-
-/*
- * Here we handle simple allocation of the scratch registers.
- * If too many registers are alloc'd, the allocator punts.
- */
-static int regused[BPF_MEMWORDS];
-static int curreg;
-
-/*
- * Return the next free register.
- */
-static int
-alloc_reg()
-{
-	int n = BPF_MEMWORDS;
-
-	while (--n >= 0) {
-		if (regused[curreg])
-			curreg = (curreg + 1) % BPF_MEMWORDS;
-		else {
-			regused[curreg] = 1;
-			return curreg;
-		}
-	}
-	bpf_error("too many registers needed to evaluate expression");
-	/* NOTREACHED */
-}
-
-/*
- * Return a register to the table so it can
- * be used later.
- */
-static void
-free_reg(n)
-	int n;
-{
-	regused[n] = 0;
-}
-
-static struct block *
-gen_len(jmp, n)
-	int jmp, n;
-{
-	struct slist *s;
-	struct block *b;
-
-	s = new_stmt(BPF_LD|BPF_LEN);
-	b = new_block(JMP(jmp));
-	b->stmts = s;
-	b->s.k = n;
-
-	return b;
-}
-
-struct block *
-gen_greater(n)
-	int n;
-{
-	return gen_len(BPF_JGE, n);
-}
-
-struct block *
-gen_less(n)
-	int n;
-{
-	struct block *b;
-
-	b = gen_len(BPF_JGT, n);
-	gen_not(b);
-
-	return b;
-}
-
-struct block *
-gen_byteop(op, idx, val)
-	int op, idx, val;
-{
-	struct block *b;
-	struct slist *s;
-
-	switch (op) {
-	default:
-		abort();
-
-	case '=':
-		return gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
-
-	case '<':
-		b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
-		b->s.code = JMP(BPF_JGE);
-		gen_not(b);
-		return b;
-
-	case '>':
-		b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
-		b->s.code = JMP(BPF_JGT);
-		return b;
-
-	case '|':
-		s = new_stmt(BPF_ALU|BPF_OR|BPF_K);
-		break;
-
-	case '&':
-		s = new_stmt(BPF_ALU|BPF_AND|BPF_K);
-		break;
-	}
-	s->s.k = val;
-	b = new_block(JMP(BPF_JEQ));
-	b->stmts = s;
-	gen_not(b);
-
-	return b;
-}
-
-struct block *
-gen_broadcast(proto)
-	int proto;
-{
-	bpf_u_int32 hostmask;
-	struct block *b0, *b1, *b2;
-	static u_char ebroadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
-
-	switch (proto) {
-
-	case Q_DEFAULT:
-	case Q_LINK:
-		if (linktype == DLT_EN10MB)
-			return gen_ehostop(ebroadcast, Q_DST);
-		if (linktype == DLT_FDDI)
-			return gen_fhostop(ebroadcast, Q_DST);
-		bpf_error("not a broadcast link");
-		break;
-
-	case Q_IP:
-		b0 = gen_linktype(ETHERTYPE_IP);
-		hostmask = ~netmask;
-		b1 = gen_mcmp(off_nl + 16, BPF_W, (bpf_int32)0, hostmask);
-		b2 = gen_mcmp(off_nl + 16, BPF_W,
-			      (bpf_int32)(~0 & hostmask), hostmask);
-		gen_or(b1, b2);
-		gen_and(b0, b2);
-		return b2;
-	}
-	bpf_error("only ether/ip broadcast filters supported");
-}
-
-struct block *
-gen_multicast(proto)
-	int proto;
-{
-	register struct block *b0, *b1;
-	register struct slist *s;
-
-	switch (proto) {
-
-	case Q_DEFAULT:
-	case Q_LINK:
-		if (linktype == DLT_EN10MB) {
-			/* ether[0] & 1 != 0 */
-			s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
-			s->s.k = 0;
-			b0 = new_block(JMP(BPF_JSET));
-			b0->s.k = 1;
-			b0->stmts = s;
-			return b0;
-		}
-
-		if (linktype == DLT_FDDI) {
-			/* XXX TEST THIS: MIGHT NOT PORT PROPERLY XXX */
-			/* fddi[1] & 1 != 0 */
-			s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
-			s->s.k = 1;
-			b0 = new_block(JMP(BPF_JSET));
-			b0->s.k = 1;
-			b0->stmts = s;
-			return b0;
-		}
-		/* Link not known to support multicasts */
-		break;
-
-	case Q_IP:
-		b0 = gen_linktype(ETHERTYPE_IP);
-		b1 = gen_cmp(off_nl + 16, BPF_B, (bpf_int32)224);
-		b1->s.code = JMP(BPF_JGE);
-		gen_and(b0, b1);
-		return b1;
-	}
-	bpf_error("only IP multicast filters supported on ethernet/FDDI");
-}
-
-/*
- * generate command for inbound/outbound.  It's here so we can
- * make it link-type specific.  'dir' = 0 implies "inbound",
- * = 1 implies "outbound".
- */
-struct block *
-gen_inbound(dir)
-	int dir;
-{
-	register struct block *b0;
-
-	b0 = gen_relation(BPF_JEQ,
-			  gen_load(Q_LINK, gen_loadi(0), 1),
-			  gen_loadi(0),
-			  dir);
-	return (b0);
-}