2000-01-30 00:43:38 +00:00
|
|
|
/*#define CHASE_CHAIN*/
|
1996-08-19 20:36:34 +00:00
|
|
|
/*
|
1998-09-15 19:31:43 +00:00
|
|
|
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
|
1996-08-19 20:36:34 +00:00
|
|
|
* 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.
|
2000-01-30 00:43:38 +00:00
|
|
|
*
|
|
|
|
* $FreeBSD$
|
1996-08-19 20:36:34 +00:00
|
|
|
*/
|
|
|
|
#ifndef lint
|
1997-05-27 00:05:23 +00:00
|
|
|
static const char rcsid[] =
|
2001-04-03 04:32:48 +00:00
|
|
|
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.140.2.1 2001/01/14 06:48:35 guy Exp $ (LBL)";
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
|
|
#include "config.h"
|
1996-08-19 20:36:34 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#include <sys/time.h>
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef __NetBSD__
|
|
|
|
#include <sys/param.h>
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
struct mbuf;
|
|
|
|
struct rtentry;
|
|
|
|
#include <net/if.h>
|
|
|
|
|
|
|
|
#include <netinet/in.h>
|
|
|
|
|
|
|
|
#include <stdlib.h>
|
2001-04-03 04:32:48 +00:00
|
|
|
#include <string.h>
|
1996-08-19 20:36:34 +00:00
|
|
|
#include <memory.h>
|
|
|
|
#include <setjmp.h>
|
|
|
|
#include <stdarg.h>
|
|
|
|
|
|
|
|
#include "pcap-int.h"
|
|
|
|
|
|
|
|
#include "ethertype.h"
|
1996-08-21 20:01:08 +00:00
|
|
|
#include "nlpid.h"
|
1996-08-19 20:36:34 +00:00
|
|
|
#include "gencode.h"
|
1998-09-15 19:31:43 +00:00
|
|
|
#include "ppp.h"
|
2001-04-03 04:32:48 +00:00
|
|
|
#include "sll.h"
|
1996-08-19 20:36:34 +00:00
|
|
|
#include <pcap-namedb.h>
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
#include <netdb.h>
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#endif /*INET6*/
|
1996-08-19 20:36:34 +00:00
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
#define LLC_SNAP_LSAP 0xaa
|
|
|
|
#define LLC_ISO_LSAP 0xfe
|
|
|
|
|
|
|
|
#undef ETHERMTU
|
|
|
|
#define ETHERMTU 1500
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
#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 */
|
2001-04-03 04:32:48 +00:00
|
|
|
void
|
1996-08-19 20:36:34 +00:00
|
|
|
bpf_error(const char *fmt, ...)
|
2001-04-03 04:32:48 +00:00
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
{
|
|
|
|
va_list ap;
|
|
|
|
|
|
|
|
va_start(ap, fmt);
|
|
|
|
if (bpf_pcap != NULL)
|
2001-04-03 04:32:48 +00:00
|
|
|
(void)vsnprintf(pcap_geterr(bpf_pcap), PCAP_ERRBUF_SIZE,
|
|
|
|
fmt, ap);
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
2001-04-03 04:32:48 +00:00
|
|
|
static struct block *gen_cmp_gt(u_int, u_int, bpf_int32);
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
2001-04-03 04:32:48 +00:00
|
|
|
static struct block *gen_snap(bpf_u_int32, bpf_u_int32, u_int);
|
1996-08-19 20:36:34 +00:00
|
|
|
static struct block *gen_hostop(bpf_u_int32, bpf_u_int32, int, int, u_int, u_int);
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
static struct block *gen_hostop6(struct in6_addr *, struct in6_addr *, int, int, u_int, u_int);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
static struct block *gen_ehostop(const u_char *, int);
|
|
|
|
static struct block *gen_fhostop(const u_char *, int);
|
2001-04-03 04:32:48 +00:00
|
|
|
static struct block *gen_thostop(const u_char *, int);
|
1996-08-19 20:36:34 +00:00
|
|
|
static struct block *gen_dnhostop(bpf_u_int32, int, u_int);
|
|
|
|
static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int);
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
static struct block *gen_host6(struct in6_addr *, struct in6_addr *, int, int);
|
|
|
|
#endif
|
2001-04-03 04:32:48 +00:00
|
|
|
#ifndef INET6
|
1996-08-19 20:36:34 +00:00
|
|
|
static struct block *gen_gateway(const u_char *, bpf_u_int32 **, int, int);
|
2001-04-03 04:32:48 +00:00
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
static struct block *gen_ipfrag(void);
|
|
|
|
static struct block *gen_portatom(int, bpf_int32);
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
static struct block *gen_portatom6(int, bpf_int32);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
struct block *gen_portop(int, int, int);
|
|
|
|
static struct block *gen_port(int, int, int);
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
struct block *gen_portop6(int, int, int);
|
|
|
|
static struct block *gen_port6(int, int, int);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
static int lookup_proto(const char *, int);
|
2001-04-03 04:32:48 +00:00
|
|
|
static struct block *gen_protochain(int, int, int);
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifndef __NetBSD__
|
1996-08-19 20:36:34 +00:00
|
|
|
/* XXX Round up to nearest long. */
|
|
|
|
n = (n + sizeof(long) - 1) & ~(sizeof(long) - 1);
|
2000-01-30 00:43:38 +00:00
|
|
|
#else
|
|
|
|
/* XXX Round up to structure boundary. */
|
|
|
|
n = ALIGN(n);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
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);
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
strlcpy(cp, s, n);
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
2000-01-30 00:43:38 +00:00
|
|
|
int no_optimize;
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
int
|
|
|
|
pcap_compile(pcap_t *p, struct bpf_program *program,
|
|
|
|
char *buf, int optimize, bpf_u_int32 mask)
|
|
|
|
{
|
|
|
|
extern int n_errors;
|
|
|
|
int len;
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
no_optimize = 0;
|
1996-08-19 20:36:34 +00:00
|
|
|
n_errors = 0;
|
|
|
|
root = NULL;
|
|
|
|
bpf_pcap = p;
|
|
|
|
if (setjmp(top_ctx)) {
|
2001-04-03 04:32:48 +00:00
|
|
|
lex_cleanup();
|
1996-08-19 20:36:34 +00:00
|
|
|
freechunks();
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
|
|
|
|
netmask = mask;
|
2001-04-03 04:32:48 +00:00
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
snaplen = pcap_snapshot(p);
|
2001-04-03 04:32:48 +00:00
|
|
|
if (snaplen == 0) {
|
|
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
|
|
|
"snaplen of 0 rejects all packets");
|
|
|
|
return -1;
|
|
|
|
}
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
lex_init(buf ? buf : "");
|
|
|
|
init_linktype(pcap_datalink(p));
|
|
|
|
(void)pcap_parse();
|
|
|
|
|
|
|
|
if (n_errors)
|
|
|
|
syntax();
|
|
|
|
|
|
|
|
if (root == NULL)
|
|
|
|
root = gen_retblk(snaplen);
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
if (optimize && !no_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;
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
lex_cleanup();
|
2000-01-30 00:43:38 +00:00
|
|
|
freechunks();
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* entry point for using the compiler with no pcap open
|
|
|
|
* pass in all the stuff that is needed explicitly instead.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
pcap_compile_nopcap(int snaplen_arg, int linktype_arg,
|
|
|
|
struct bpf_program *program,
|
|
|
|
char *buf, int optimize, bpf_u_int32 mask)
|
|
|
|
{
|
2001-04-03 04:32:48 +00:00
|
|
|
pcap_t *p;
|
|
|
|
int ret;
|
2000-01-30 00:43:38 +00:00
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
p = pcap_open_dead(linktype_arg, snaplen_arg);
|
|
|
|
if (p == NULL)
|
2000-01-30 00:43:38 +00:00
|
|
|
return (-1);
|
2001-04-03 04:32:48 +00:00
|
|
|
ret = pcap_compile(p, program, buf, optimize, mask);
|
|
|
|
pcap_close(p);
|
|
|
|
return (ret);
|
|
|
|
}
|
2000-01-30 00:43:38 +00:00
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
/*
|
|
|
|
* Clean up a "struct bpf_program" by freeing all the memory allocated
|
|
|
|
* in it.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
pcap_freecode(struct bpf_program *program)
|
|
|
|
{
|
|
|
|
program->bf_len = 0;
|
|
|
|
if (program->bf_insns != NULL) {
|
|
|
|
free((char *)program->bf_insns);
|
|
|
|
program->bf_insns = NULL;
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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;
|
|
|
|
}
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
static struct block *
|
|
|
|
gen_cmp_gt(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_JGT));
|
|
|
|
b->stmts = s;
|
|
|
|
b->s.k = v;
|
|
|
|
|
|
|
|
return b;
|
|
|
|
}
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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];
|
1997-05-27 00:05:23 +00:00
|
|
|
bpf_int32 w = ((bpf_int32)p[0] << 24) |
|
|
|
|
((bpf_int32)p[1] << 16) | ((bpf_int32)p[2] << 8) | p[3];
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
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];
|
1997-05-27 00:05:23 +00:00
|
|
|
bpf_int32 w = ((bpf_int32)p[0] << 8) | p[1];
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
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;
|
|
|
|
|
1998-09-15 19:31:43 +00:00
|
|
|
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;
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
case DLT_NULL:
|
2001-04-03 04:32:48 +00:00
|
|
|
case DLT_LOOP:
|
1996-08-19 20:36:34 +00:00
|
|
|
off_linktype = 0;
|
|
|
|
off_nl = 4;
|
|
|
|
return;
|
|
|
|
|
|
|
|
case DLT_PPP:
|
2001-04-03 04:32:48 +00:00
|
|
|
case DLT_C_HDLC:
|
|
|
|
case DLT_PPP_SERIAL:
|
1996-08-19 20:36:34 +00:00
|
|
|
off_linktype = 2;
|
|
|
|
off_nl = 4;
|
|
|
|
return;
|
|
|
|
|
1998-09-15 19:31:43 +00:00
|
|
|
case DLT_PPP_BSDOS:
|
|
|
|
off_linktype = 5;
|
|
|
|
off_nl = 24;
|
|
|
|
return;
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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.
|
2001-04-03 04:32:48 +00:00
|
|
|
*
|
|
|
|
* XXX - should we generate code to check for SNAP?
|
1996-08-19 20:36:34 +00:00
|
|
|
*/
|
|
|
|
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:
|
2001-04-03 04:32:48 +00:00
|
|
|
/*
|
|
|
|
* Token Ring doesn't really have a link-level type field.
|
|
|
|
* We assume that SSAP = SNAP is being used and pick
|
|
|
|
* out the encapsulated Ethernet type.
|
|
|
|
*
|
|
|
|
* XXX - should we generate code to check for SNAP?
|
|
|
|
*
|
|
|
|
* XXX - the header is actually variable-length.
|
|
|
|
* Some various Linux patched versions gave 38
|
|
|
|
* as "off_linktype" and 40 as "off_nl"; however,
|
|
|
|
* if a token ring packet has *no* routing
|
|
|
|
* information, i.e. is not source-routed, the correct
|
|
|
|
* values are 20 and 22, as they are in the vanilla code.
|
|
|
|
*
|
|
|
|
* A packet is source-routed iff the uppermost bit
|
|
|
|
* of the first byte of the source address, at an
|
|
|
|
* offset of 8, has the uppermost bit set. If the
|
|
|
|
* packet is source-routed, the total number of bytes
|
|
|
|
* of routing information is 2 plus bits 0x1F00 of
|
|
|
|
* the 16-bit value at an offset of 14 (shifted right
|
|
|
|
* 8 - figure out which byte that is).
|
|
|
|
*/
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
1997-05-27 00:05:23 +00:00
|
|
|
|
|
|
|
case DLT_RAW:
|
|
|
|
off_linktype = -1;
|
|
|
|
off_nl = 0;
|
|
|
|
return;
|
2001-04-03 04:32:48 +00:00
|
|
|
|
|
|
|
case DLT_ATM_CLIP: /* Linux ATM defines this */
|
|
|
|
off_linktype = 6;
|
|
|
|
off_nl = 8;
|
|
|
|
return;
|
|
|
|
|
|
|
|
case DLT_LINUX_SLL: /* fake header for Linux cooked socket */
|
|
|
|
off_linktype = 14;
|
|
|
|
off_nl = 16;
|
|
|
|
return;
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
2001-04-03 04:32:48 +00:00
|
|
|
bpf_error("unknown data link type %d", linktype);
|
1996-08-19 20:36:34 +00:00
|
|
|
/* 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);
|
|
|
|
}
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
/*
|
|
|
|
* Byte-swap a 32-bit number.
|
|
|
|
* ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
|
|
|
|
* big-endian platforms.)
|
|
|
|
*/
|
|
|
|
#define SWAPLONG(y) \
|
|
|
|
((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
static struct block *
|
|
|
|
gen_linktype(proto)
|
1998-09-15 19:31:43 +00:00
|
|
|
register int proto;
|
1996-08-19 20:36:34 +00:00
|
|
|
{
|
1998-09-15 19:31:43 +00:00
|
|
|
struct block *b0, *b1;
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
/* If we're not using encapsulation, we're done */
|
|
|
|
if (off_linktype == -1)
|
1997-05-27 00:05:23 +00:00
|
|
|
return gen_true();
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
switch (linktype) {
|
1997-05-27 00:05:23 +00:00
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case DLT_EN10MB:
|
|
|
|
/*
|
|
|
|
* XXX - handle other LLC-encapsulated protocols here
|
|
|
|
* (IPX, OSI)?
|
|
|
|
*/
|
|
|
|
switch (proto) {
|
|
|
|
|
|
|
|
case LLC_ISO_LSAP:
|
|
|
|
/*
|
|
|
|
* OSI protocols always use 802.2 encapsulation.
|
|
|
|
*/
|
|
|
|
b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
|
|
|
|
gen_not(b0);
|
|
|
|
b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
|
|
|
|
((LLC_ISO_LSAP << 8) | LLC_ISO_LSAP));
|
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
|
|
|
|
case ETHERTYPE_ATALK:
|
|
|
|
case ETHERTYPE_AARP:
|
|
|
|
/*
|
|
|
|
* EtherTalk (AppleTalk protocols on Ethernet link
|
|
|
|
* layer) may use 802.2 encapsulation.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check for 802.2 encapsulation (EtherTalk phase 2?);
|
|
|
|
* we check for an Ethernet type field less than
|
|
|
|
* 1500, which means it's an 802.3 length field.
|
|
|
|
*/
|
|
|
|
b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
|
|
|
|
gen_not(b0);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 802.2-encapsulated ETHERTYPE_ATALK packets are
|
|
|
|
* SNAP packets with an organization code of
|
|
|
|
* 0x080007 (Apple, for Appletalk) and a protocol
|
|
|
|
* type of ETHERTYPE_ATALK (Appletalk).
|
|
|
|
*
|
|
|
|
* 802.2-encapsulated ETHERTYPE_AARP packets are
|
|
|
|
* SNAP packets with an organization code of
|
|
|
|
* 0x000000 (encapsulated Ethernet) and a protocol
|
|
|
|
* type of ETHERTYPE_AARP (Appletalk ARP).
|
|
|
|
*/
|
|
|
|
if (proto == ETHERTYPE_ATALK)
|
|
|
|
b1 = gen_snap(0x080007, ETHERTYPE_ATALK, 14);
|
|
|
|
else /* proto == ETHERTYPE_AARP */
|
|
|
|
b1 = gen_snap(0x000000, ETHERTYPE_AARP, 14);
|
|
|
|
gen_and(b0, b1);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check for Ethernet encapsulation (Ethertalk
|
|
|
|
* phase 1?); we just check for the Ethernet
|
|
|
|
* protocol type.
|
|
|
|
*/
|
|
|
|
b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
|
|
|
|
|
|
|
|
gen_or(b0, b1);
|
|
|
|
return b1;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
case DLT_SLIP:
|
1997-05-27 00:05:23 +00:00
|
|
|
return gen_false();
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
case DLT_PPP:
|
2001-04-03 04:32:48 +00:00
|
|
|
case DLT_PPP_SERIAL:
|
|
|
|
/*
|
|
|
|
* We use Ethernet protocol types inside libpcap;
|
|
|
|
* map them to the corresponding PPP protocol types.
|
|
|
|
*/
|
|
|
|
switch (proto) {
|
|
|
|
|
|
|
|
case ETHERTYPE_IP:
|
1998-09-15 19:31:43 +00:00
|
|
|
proto = PPP_IP; /* XXX was 0x21 */
|
2001-04-03 04:32:48 +00:00
|
|
|
break;
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
2001-04-03 04:32:48 +00:00
|
|
|
case ETHERTYPE_IPV6:
|
2000-01-30 00:43:38 +00:00
|
|
|
proto = PPP_IPV6;
|
2001-04-03 04:32:48 +00:00
|
|
|
break;
|
2000-01-30 00:43:38 +00:00
|
|
|
#endif
|
2001-04-03 04:32:48 +00:00
|
|
|
|
|
|
|
case ETHERTYPE_DN:
|
|
|
|
proto = PPP_DECNET;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case ETHERTYPE_ATALK:
|
|
|
|
proto = PPP_APPLE;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case ETHERTYPE_NS:
|
|
|
|
proto = PPP_NS;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case LLC_ISO_LSAP:
|
|
|
|
proto = PPP_OSI;
|
|
|
|
break;
|
|
|
|
}
|
1998-09-15 19:31:43 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case DLT_PPP_BSDOS:
|
2001-04-03 04:32:48 +00:00
|
|
|
/*
|
|
|
|
* We use Ethernet protocol types inside libpcap;
|
|
|
|
* map them to the corresponding PPP protocol types.
|
|
|
|
*/
|
1998-09-15 19:31:43 +00:00
|
|
|
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;
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
case ETHERTYPE_IPV6:
|
|
|
|
proto = PPP_IPV6;
|
|
|
|
/* more to go? */
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
1998-09-15 19:31:43 +00:00
|
|
|
case ETHERTYPE_DN:
|
|
|
|
proto = PPP_DECNET;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case ETHERTYPE_ATALK:
|
|
|
|
proto = PPP_APPLE;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case ETHERTYPE_NS:
|
|
|
|
proto = PPP_NS;
|
|
|
|
break;
|
2001-04-03 04:32:48 +00:00
|
|
|
|
|
|
|
case LLC_ISO_LSAP:
|
|
|
|
proto = PPP_OSI;
|
|
|
|
break;
|
1998-09-15 19:31:43 +00:00
|
|
|
}
|
1996-08-19 20:36:34 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case DLT_NULL:
|
2001-04-03 04:32:48 +00:00
|
|
|
case DLT_LOOP:
|
|
|
|
/*
|
|
|
|
* For DLT_NULL, the link-layer header is a 32-bit
|
|
|
|
* word containing an AF_ value in *host* byte order.
|
|
|
|
*
|
|
|
|
* In addition, if we're reading a saved capture file,
|
|
|
|
* the host byte order in the capture may not be the
|
|
|
|
* same as the host byte order on this machine.
|
|
|
|
*
|
|
|
|
* For DLT_LOOP, the link-layer header is a 32-bit
|
|
|
|
* word containing an AF_ value in *network* byte order.
|
|
|
|
*
|
|
|
|
* XXX - AF_ values may, unfortunately, be platform-
|
|
|
|
* dependent; for example, FreeBSD's AF_INET6 is 24
|
|
|
|
* whilst NetBSD's and OpenBSD's is 26.
|
|
|
|
*
|
|
|
|
* This means that, when reading a capture file, just
|
|
|
|
* checking for our AF_INET6 value won't work if the
|
|
|
|
* capture file came from another OS.
|
|
|
|
*/
|
|
|
|
switch (proto) {
|
|
|
|
|
|
|
|
case ETHERTYPE_IP:
|
|
|
|
proto = AF_INET;
|
|
|
|
break;
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
2001-04-03 04:32:48 +00:00
|
|
|
case ETHERTYPE_IPV6:
|
|
|
|
proto = AF_INET6;
|
|
|
|
break;
|
2000-01-30 00:43:38 +00:00
|
|
|
#endif
|
2001-04-03 04:32:48 +00:00
|
|
|
|
|
|
|
default:
|
|
|
|
/*
|
|
|
|
* Not a type on which we support filtering.
|
|
|
|
* XXX - support those that have AF_ values
|
|
|
|
* #defined on this platform, at least?
|
|
|
|
*/
|
1996-08-19 20:36:34 +00:00
|
|
|
return gen_false();
|
2001-04-03 04:32:48 +00:00
|
|
|
}
|
1996-08-21 20:01:08 +00:00
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
if (linktype == DLT_NULL) {
|
|
|
|
/*
|
|
|
|
* The AF_ value is in host byte order, but
|
|
|
|
* the BPF interpreter will convert it to
|
|
|
|
* network byte order.
|
|
|
|
*
|
|
|
|
* If this is a save file, and it's from a
|
|
|
|
* machine with the opposite byte order to
|
|
|
|
* ours, we byte-swap the AF_ value.
|
|
|
|
*
|
|
|
|
* Then we run it through "htonl()", and
|
|
|
|
* generate code to compare against the result.
|
|
|
|
*/
|
|
|
|
if (bpf_pcap->sf.rfile != NULL &&
|
|
|
|
bpf_pcap->sf.swapped)
|
|
|
|
proto = SWAPLONG(proto);
|
|
|
|
proto = htonl(proto);
|
1996-08-21 20:01:08 +00:00
|
|
|
}
|
2001-04-03 04:32:48 +00:00
|
|
|
return (gen_cmp(0, BPF_W, (bpf_int32)proto));
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
|
|
|
|
}
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
/*
|
|
|
|
* Check for an LLC SNAP packet with a given organization code and
|
|
|
|
* protocol type; we check the entire contents of the 802.2 LLC and
|
|
|
|
* snap headers, checking for DSAP and SSAP of SNAP and a control
|
|
|
|
* field of 0x03 in the LLC header, and for the specified organization
|
|
|
|
* code and protocol type in the SNAP header.
|
|
|
|
*/
|
|
|
|
static struct block *
|
|
|
|
gen_snap(orgcode, ptype, offset)
|
|
|
|
bpf_u_int32 orgcode;
|
|
|
|
bpf_u_int32 ptype;
|
|
|
|
u_int offset;
|
|
|
|
{
|
|
|
|
u_char snapblock[8];
|
|
|
|
|
|
|
|
snapblock[0] = LLC_SNAP_LSAP; /* DSAP = SNAP */
|
|
|
|
snapblock[1] = LLC_SNAP_LSAP; /* SSAP = SNAP */
|
|
|
|
snapblock[2] = 0x03; /* control = UI */
|
|
|
|
snapblock[3] = (orgcode >> 16); /* upper 8 bits of organization code */
|
|
|
|
snapblock[4] = (orgcode >> 8); /* middle 8 bits of organization code */
|
|
|
|
snapblock[5] = (orgcode >> 0); /* lower 8 bits of organization code */
|
|
|
|
snapblock[6] = (ptype >> 8); /* upper 8 bits of protocol type */
|
|
|
|
snapblock[7] = (ptype >> 0); /* lower 8 bits of protocol type */
|
|
|
|
return gen_bcmp(offset, 8, snapblock);
|
|
|
|
}
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
static struct block *
|
|
|
|
gen_hostop6(addr, mask, dir, proto, src_off, dst_off)
|
|
|
|
struct in6_addr *addr;
|
|
|
|
struct in6_addr *mask;
|
|
|
|
int dir, proto;
|
|
|
|
u_int src_off, dst_off;
|
|
|
|
{
|
|
|
|
struct block *b0, *b1;
|
|
|
|
u_int offset;
|
|
|
|
u_int32_t *a, *m;
|
|
|
|
|
|
|
|
switch (dir) {
|
|
|
|
|
|
|
|
case Q_SRC:
|
|
|
|
offset = src_off;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_DST:
|
|
|
|
offset = dst_off;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_AND:
|
|
|
|
b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off);
|
|
|
|
b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off);
|
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
|
|
|
|
case Q_OR:
|
|
|
|
case Q_DEFAULT:
|
|
|
|
b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off);
|
|
|
|
b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
return b1;
|
|
|
|
|
|
|
|
default:
|
|
|
|
abort();
|
|
|
|
}
|
|
|
|
/* this order is important */
|
|
|
|
a = (u_int32_t *)addr;
|
|
|
|
m = (u_int32_t *)mask;
|
|
|
|
b1 = gen_mcmp(offset + 12, BPF_W, ntohl(a[3]), ntohl(m[3]));
|
|
|
|
b0 = gen_mcmp(offset + 8, BPF_W, ntohl(a[2]), ntohl(m[2]));
|
|
|
|
gen_and(b0, b1);
|
|
|
|
b0 = gen_mcmp(offset + 4, BPF_W, ntohl(a[1]), ntohl(m[1]));
|
|
|
|
gen_and(b0, b1);
|
|
|
|
b0 = gen_mcmp(offset + 0, BPF_W, ntohl(a[0]), ntohl(m[0]));
|
|
|
|
gen_and(b0, b1);
|
|
|
|
b0 = gen_linktype(proto);
|
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
}
|
|
|
|
#endif /*INET6*/
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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 */
|
|
|
|
}
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
/*
|
|
|
|
* Like gen_ehostop, but for DLT_IEEE802 (Token Ring)
|
|
|
|
*/
|
|
|
|
static struct block *
|
|
|
|
gen_thostop(eaddr, dir)
|
|
|
|
register const u_char *eaddr;
|
|
|
|
register int dir;
|
|
|
|
{
|
|
|
|
register struct block *b0, *b1;
|
|
|
|
|
|
|
|
switch (dir) {
|
|
|
|
case Q_SRC:
|
|
|
|
return gen_bcmp(8, 6, eaddr);
|
|
|
|
|
|
|
|
case Q_DST:
|
|
|
|
return gen_bcmp(2, 6, eaddr);
|
|
|
|
|
|
|
|
case Q_AND:
|
|
|
|
b0 = gen_thostop(eaddr, Q_SRC);
|
|
|
|
b1 = gen_thostop(eaddr, Q_DST);
|
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
|
|
|
|
case Q_DEFAULT:
|
|
|
|
case Q_OR:
|
|
|
|
b0 = gen_thostop(eaddr, Q_SRC);
|
|
|
|
b1 = gen_thostop(eaddr, Q_DST);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
return b1;
|
|
|
|
}
|
|
|
|
abort();
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
/*
|
|
|
|
* 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;
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case Q_ISO:
|
|
|
|
bpf_error("ISO host filtering not implemented");
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
2001-04-03 04:32:48 +00:00
|
|
|
if (off_linktype != -1) {
|
|
|
|
b1 = gen_host(addr, mask, Q_ARP, dir);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
b0 = gen_host(addr, mask, Q_RARP, dir);
|
|
|
|
gen_or(b1, b0);
|
|
|
|
}
|
1996-08-19 20:36:34 +00:00
|
|
|
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");
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
case Q_PIM:
|
|
|
|
bpf_error("'pim' modifier applied to host");
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
case Q_ATALK:
|
|
|
|
bpf_error("ATALK host filtering not implemented");
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case Q_AARP:
|
|
|
|
bpf_error("AARP host filtering not implemented");
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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");
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
case Q_IPV6:
|
|
|
|
bpf_error("'ip6' modifier applied to ip host");
|
|
|
|
|
|
|
|
case Q_ICMPV6:
|
|
|
|
bpf_error("'icmp6' modifier applied to host");
|
|
|
|
#endif /* INET6 */
|
|
|
|
|
|
|
|
case Q_AH:
|
|
|
|
bpf_error("'ah' modifier applied to host");
|
|
|
|
|
|
|
|
case Q_ESP:
|
|
|
|
bpf_error("'esp' modifier applied to host");
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case Q_ISO:
|
|
|
|
bpf_error("ISO host filtering not implemented");
|
|
|
|
|
|
|
|
case Q_ESIS:
|
|
|
|
bpf_error("'esis' modifier applied to host");
|
|
|
|
|
|
|
|
case Q_ISIS:
|
|
|
|
bpf_error("'isis' modifier applied to host");
|
|
|
|
|
|
|
|
case Q_CLNP:
|
|
|
|
bpf_error("'clnp' modifier applied to host");
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
default:
|
|
|
|
abort();
|
|
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
static struct block *
|
|
|
|
gen_host6(addr, mask, proto, dir)
|
|
|
|
struct in6_addr *addr;
|
|
|
|
struct in6_addr *mask;
|
|
|
|
int proto;
|
|
|
|
int dir;
|
|
|
|
{
|
|
|
|
switch (proto) {
|
|
|
|
|
|
|
|
case Q_DEFAULT:
|
|
|
|
return gen_host6(addr, mask, Q_IPV6, dir);
|
|
|
|
|
|
|
|
case Q_IP:
|
|
|
|
bpf_error("'ip' modifier applied to ip6 host");
|
|
|
|
|
|
|
|
case Q_RARP:
|
|
|
|
bpf_error("'rarp' modifier applied to ip6 host");
|
|
|
|
|
|
|
|
case Q_ARP:
|
|
|
|
bpf_error("'arp' modifier applied to ip6 host");
|
|
|
|
|
|
|
|
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_PIM:
|
|
|
|
bpf_error("'pim' modifier applied to host");
|
|
|
|
|
|
|
|
case Q_ATALK:
|
|
|
|
bpf_error("ATALK host filtering not implemented");
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case Q_AARP:
|
|
|
|
bpf_error("AARP host filtering not implemented");
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
case Q_DECNET:
|
|
|
|
bpf_error("'decnet' modifier applied to ip6 host");
|
|
|
|
|
|
|
|
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");
|
|
|
|
|
|
|
|
case Q_IPV6:
|
|
|
|
return gen_hostop6(addr, mask, dir, ETHERTYPE_IPV6,
|
|
|
|
off_nl + 8, off_nl + 24);
|
|
|
|
|
|
|
|
case Q_ICMPV6:
|
|
|
|
bpf_error("'icmp6' modifier applied to host");
|
|
|
|
|
|
|
|
case Q_AH:
|
|
|
|
bpf_error("'ah' modifier applied to host");
|
|
|
|
|
|
|
|
case Q_ESP:
|
|
|
|
bpf_error("'esp' modifier applied to host");
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case Q_ISO:
|
|
|
|
bpf_error("ISO host filtering not implemented");
|
|
|
|
|
|
|
|
case Q_ESIS:
|
|
|
|
bpf_error("'esis' modifier applied to host");
|
|
|
|
|
|
|
|
case Q_ISIS:
|
|
|
|
bpf_error("'isis' modifier applied to host");
|
|
|
|
|
|
|
|
case Q_CLNP:
|
|
|
|
bpf_error("'clnp' modifier applied to host");
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
default:
|
|
|
|
abort();
|
|
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
#endif /*INET6*/
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
#ifndef INET6
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
2001-04-03 04:32:48 +00:00
|
|
|
else if (linktype == DLT_IEEE802)
|
|
|
|
b0 = gen_thostop(eaddr, Q_OR);
|
1996-08-19 20:36:34 +00:00
|
|
|
else
|
|
|
|
bpf_error(
|
2001-04-03 04:32:48 +00:00
|
|
|
"'gateway' supported only on ethernet, FDDI or token ring");
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
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 */
|
|
|
|
}
|
2001-04-03 04:32:48 +00:00
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
struct block *
|
|
|
|
gen_proto_abbrev(proto)
|
|
|
|
int proto;
|
|
|
|
{
|
2001-04-03 04:32:48 +00:00
|
|
|
#ifdef INET6
|
|
|
|
struct block *b0;
|
|
|
|
#endif
|
|
|
|
struct block *b1;
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
switch (proto) {
|
|
|
|
|
|
|
|
case Q_TCP:
|
2000-01-30 00:43:38 +00:00
|
|
|
b1 = gen_proto(IPPROTO_TCP, Q_IP, Q_DEFAULT);
|
|
|
|
#ifdef INET6
|
|
|
|
b0 = gen_proto(IPPROTO_TCP, Q_IPV6, Q_DEFAULT);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_UDP:
|
2000-01-30 00:43:38 +00:00
|
|
|
b1 = gen_proto(IPPROTO_UDP, Q_IP, Q_DEFAULT);
|
|
|
|
#ifdef INET6
|
|
|
|
b0 = gen_proto(IPPROTO_UDP, Q_IPV6, Q_DEFAULT);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_ICMP:
|
2000-01-30 00:43:38 +00:00
|
|
|
b1 = gen_proto(IPPROTO_ICMP, Q_IP, Q_DEFAULT);
|
1996-08-19 20:36:34 +00:00
|
|
|
break;
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
#ifndef IPPROTO_IGMP
|
|
|
|
#define IPPROTO_IGMP 2
|
|
|
|
#endif
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
case Q_IGMP:
|
2001-04-03 04:32:48 +00:00
|
|
|
b1 = gen_proto(IPPROTO_IGMP, Q_IP, Q_DEFAULT);
|
1996-08-19 20:36:34 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
#ifndef IPPROTO_IGRP
|
|
|
|
#define IPPROTO_IGRP 9
|
|
|
|
#endif
|
|
|
|
case Q_IGRP:
|
2000-01-30 00:43:38 +00:00
|
|
|
b1 = gen_proto(IPPROTO_IGRP, Q_IP, Q_DEFAULT);
|
|
|
|
break;
|
|
|
|
|
|
|
|
#ifndef IPPROTO_PIM
|
|
|
|
#define IPPROTO_PIM 103
|
|
|
|
#endif
|
|
|
|
|
|
|
|
case Q_PIM:
|
|
|
|
b1 = gen_proto(IPPROTO_PIM, Q_IP, Q_DEFAULT);
|
|
|
|
#ifdef INET6
|
|
|
|
b0 = gen_proto(IPPROTO_PIM, Q_IPV6, Q_DEFAULT);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case Q_AARP:
|
|
|
|
b1 = gen_linktype(ETHERTYPE_AARP);
|
|
|
|
break;
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
case Q_IPV6:
|
|
|
|
b1 = gen_linktype(ETHERTYPE_IPV6);
|
|
|
|
break;
|
|
|
|
|
|
|
|
#ifndef IPPROTO_ICMPV6
|
|
|
|
#define IPPROTO_ICMPV6 58
|
|
|
|
#endif
|
|
|
|
case Q_ICMPV6:
|
|
|
|
b1 = gen_proto(IPPROTO_ICMPV6, Q_IPV6, Q_DEFAULT);
|
|
|
|
break;
|
|
|
|
#endif /* INET6 */
|
|
|
|
|
|
|
|
#ifndef IPPROTO_AH
|
|
|
|
#define IPPROTO_AH 51
|
|
|
|
#endif
|
|
|
|
case Q_AH:
|
|
|
|
b1 = gen_proto(IPPROTO_AH, Q_IP, Q_DEFAULT);
|
|
|
|
#ifdef INET6
|
|
|
|
b0 = gen_proto(IPPROTO_AH, Q_IPV6, Q_DEFAULT);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
#endif
|
|
|
|
break;
|
|
|
|
|
|
|
|
#ifndef IPPROTO_ESP
|
|
|
|
#define IPPROTO_ESP 50
|
|
|
|
#endif
|
|
|
|
case Q_ESP:
|
|
|
|
b1 = gen_proto(IPPROTO_ESP, Q_IP, Q_DEFAULT);
|
|
|
|
#ifdef INET6
|
|
|
|
b0 = gen_proto(IPPROTO_ESP, Q_IPV6, Q_DEFAULT);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
#endif
|
|
|
|
break;
|
|
|
|
|
1996-08-21 20:01:08 +00:00
|
|
|
case Q_ISO:
|
|
|
|
b1 = gen_linktype(LLC_ISO_LSAP);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_ESIS:
|
|
|
|
b1 = gen_proto(ISO9542_ESIS, Q_ISO, Q_DEFAULT);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_ISIS:
|
|
|
|
b1 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
|
|
|
|
break;
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case Q_CLNP:
|
|
|
|
b1 = gen_proto(ISO8473_CLNP, Q_ISO, Q_DEFAULT);
|
|
|
|
break;
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
static struct block *
|
|
|
|
gen_portatom6(off, v)
|
|
|
|
int off;
|
|
|
|
bpf_int32 v;
|
|
|
|
{
|
|
|
|
return gen_cmp(off_nl + 40 + off, BPF_H, v);
|
|
|
|
}
|
|
|
|
#endif/*INET6*/
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
struct block *
|
|
|
|
gen_portop6(port, proto, dir)
|
|
|
|
int port, proto, dir;
|
|
|
|
{
|
|
|
|
struct block *b0, *b1, *tmp;
|
|
|
|
|
|
|
|
/* ip proto 'proto' */
|
|
|
|
b0 = gen_cmp(off_nl + 6, BPF_B, (bpf_int32)proto);
|
|
|
|
|
|
|
|
switch (dir) {
|
|
|
|
case Q_SRC:
|
|
|
|
b1 = gen_portatom6(0, (bpf_int32)port);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_DST:
|
|
|
|
b1 = gen_portatom6(2, (bpf_int32)port);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_OR:
|
|
|
|
case Q_DEFAULT:
|
|
|
|
tmp = gen_portatom6(0, (bpf_int32)port);
|
|
|
|
b1 = gen_portatom6(2, (bpf_int32)port);
|
|
|
|
gen_or(tmp, b1);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case Q_AND:
|
|
|
|
tmp = gen_portatom6(0, (bpf_int32)port);
|
|
|
|
b1 = gen_portatom6(2, (bpf_int32)port);
|
|
|
|
gen_and(tmp, b1);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
abort();
|
|
|
|
}
|
|
|
|
gen_and(b0, b1);
|
|
|
|
|
|
|
|
return b1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct block *
|
|
|
|
gen_port6(port, ip_proto, dir)
|
|
|
|
int port;
|
|
|
|
int ip_proto;
|
|
|
|
int dir;
|
|
|
|
{
|
|
|
|
struct block *b0, *b1, *tmp;
|
|
|
|
|
|
|
|
/* ether proto ip */
|
|
|
|
b0 = gen_linktype(ETHERTYPE_IPV6);
|
|
|
|
|
|
|
|
switch (ip_proto) {
|
|
|
|
case IPPROTO_UDP:
|
|
|
|
case IPPROTO_TCP:
|
|
|
|
b1 = gen_portop6(port, ip_proto, dir);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case PROTO_UNDEF:
|
|
|
|
tmp = gen_portop6(port, IPPROTO_TCP, dir);
|
|
|
|
b1 = gen_portop6(port, IPPROTO_UDP, dir);
|
|
|
|
gen_or(tmp, b1);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
abort();
|
|
|
|
}
|
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
}
|
|
|
|
#endif /* INET6 */
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case Q_ISO:
|
|
|
|
if (strcmp(name, "esis") == 0)
|
|
|
|
v = ISO9542_ESIS;
|
|
|
|
else if (strcmp(name, "isis") == 0)
|
|
|
|
v = ISO10589_ISIS;
|
|
|
|
else if (strcmp(name, "clnp") == 0)
|
|
|
|
v = ISO8473_CLNP;
|
|
|
|
else
|
|
|
|
bpf_error("unknown osi proto '%s'", name);
|
|
|
|
break;
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
default:
|
|
|
|
v = PROTO_UNDEF;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return v;
|
|
|
|
}
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
#if 0
|
2000-01-30 00:43:38 +00:00
|
|
|
struct stmt *
|
|
|
|
gen_joinsp(s, n)
|
|
|
|
struct stmt **s;
|
|
|
|
int n;
|
|
|
|
{
|
2001-04-03 04:32:48 +00:00
|
|
|
return NULL;
|
2000-01-30 00:43:38 +00:00
|
|
|
}
|
2001-04-03 04:32:48 +00:00
|
|
|
#endif
|
2000-01-30 00:43:38 +00:00
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
static struct block *
|
2000-01-30 00:43:38 +00:00
|
|
|
gen_protochain(v, proto, dir)
|
|
|
|
int v;
|
|
|
|
int proto;
|
|
|
|
int dir;
|
|
|
|
{
|
|
|
|
#ifdef NO_PROTOCHAIN
|
|
|
|
return gen_proto(v, proto, dir);
|
|
|
|
#else
|
|
|
|
struct block *b0, *b;
|
2001-04-03 04:32:48 +00:00
|
|
|
struct slist *s[100];
|
2000-01-30 00:43:38 +00:00
|
|
|
int fix2, fix3, fix4, fix5;
|
|
|
|
int ahcheck, again, end;
|
|
|
|
int i, max;
|
|
|
|
int reg2 = alloc_reg();
|
|
|
|
|
|
|
|
memset(s, 0, sizeof(s));
|
|
|
|
fix2 = fix3 = fix4 = fix5 = 0;
|
|
|
|
|
|
|
|
switch (proto) {
|
|
|
|
case Q_IP:
|
|
|
|
case Q_IPV6:
|
|
|
|
break;
|
|
|
|
case Q_DEFAULT:
|
|
|
|
b0 = gen_protochain(v, Q_IP, dir);
|
|
|
|
b = gen_protochain(v, Q_IPV6, dir);
|
|
|
|
gen_or(b0, b);
|
|
|
|
return b;
|
|
|
|
default:
|
|
|
|
bpf_error("bad protocol applied for 'protochain'");
|
|
|
|
/*NOTREACHED*/
|
|
|
|
}
|
|
|
|
|
|
|
|
no_optimize = 1; /*this code is not compatible with optimzer yet */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* s[0] is a dummy entry to protect other BPF insn from damaged
|
|
|
|
* by s[fix] = foo with uninitialized variable "fix". It is somewhat
|
|
|
|
* hard to find interdependency made by jump table fixup.
|
|
|
|
*/
|
|
|
|
i = 0;
|
|
|
|
s[i] = new_stmt(0); /*dummy*/
|
|
|
|
i++;
|
|
|
|
|
|
|
|
switch (proto) {
|
|
|
|
case Q_IP:
|
|
|
|
b0 = gen_linktype(ETHERTYPE_IP);
|
|
|
|
|
|
|
|
/* A = ip->ip_p */
|
|
|
|
s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
|
|
|
|
s[i]->s.k = off_nl + 9;
|
|
|
|
i++;
|
|
|
|
/* X = ip->ip_hl << 2 */
|
|
|
|
s[i] = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
|
|
|
|
s[i]->s.k = off_nl;
|
|
|
|
i++;
|
|
|
|
break;
|
|
|
|
#ifdef INET6
|
|
|
|
case Q_IPV6:
|
|
|
|
b0 = gen_linktype(ETHERTYPE_IPV6);
|
|
|
|
|
|
|
|
/* A = ip6->ip_nxt */
|
|
|
|
s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
|
|
|
|
s[i]->s.k = off_nl + 6;
|
|
|
|
i++;
|
|
|
|
/* X = sizeof(struct ip6_hdr) */
|
|
|
|
s[i] = new_stmt(BPF_LDX|BPF_IMM);
|
|
|
|
s[i]->s.k = 40;
|
|
|
|
i++;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
bpf_error("unsupported proto to gen_protochain");
|
|
|
|
/*NOTREACHED*/
|
|
|
|
}
|
|
|
|
|
|
|
|
/* again: if (A == v) goto end; else fall through; */
|
|
|
|
again = i;
|
|
|
|
s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
|
|
|
|
s[i]->s.k = v;
|
|
|
|
s[i]->s.jt = NULL; /*later*/
|
|
|
|
s[i]->s.jf = NULL; /*update in next stmt*/
|
|
|
|
fix5 = i;
|
|
|
|
i++;
|
|
|
|
|
|
|
|
#ifndef IPPROTO_NONE
|
|
|
|
#define IPPROTO_NONE 59
|
|
|
|
#endif
|
|
|
|
/* if (A == IPPROTO_NONE) goto end */
|
|
|
|
s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
|
|
|
|
s[i]->s.jt = NULL; /*later*/
|
|
|
|
s[i]->s.jf = NULL; /*update in next stmt*/
|
|
|
|
s[i]->s.k = IPPROTO_NONE;
|
|
|
|
s[fix5]->s.jf = s[i];
|
|
|
|
fix2 = i;
|
|
|
|
i++;
|
|
|
|
|
|
|
|
#ifdef INET6
|
|
|
|
if (proto == Q_IPV6) {
|
|
|
|
int v6start, v6end, v6advance, j;
|
|
|
|
|
|
|
|
v6start = i;
|
|
|
|
/* if (A == IPPROTO_HOPOPTS) goto v6advance */
|
|
|
|
s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
|
|
|
|
s[i]->s.jt = NULL; /*later*/
|
|
|
|
s[i]->s.jf = NULL; /*update in next stmt*/
|
|
|
|
s[i]->s.k = IPPROTO_HOPOPTS;
|
|
|
|
s[fix2]->s.jf = s[i];
|
|
|
|
i++;
|
|
|
|
/* if (A == IPPROTO_DSTOPTS) goto v6advance */
|
|
|
|
s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
|
|
|
|
s[i]->s.jt = NULL; /*later*/
|
|
|
|
s[i]->s.jf = NULL; /*update in next stmt*/
|
|
|
|
s[i]->s.k = IPPROTO_DSTOPTS;
|
|
|
|
i++;
|
|
|
|
/* if (A == IPPROTO_ROUTING) goto v6advance */
|
|
|
|
s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
|
|
|
|
s[i]->s.jt = NULL; /*later*/
|
|
|
|
s[i]->s.jf = NULL; /*update in next stmt*/
|
|
|
|
s[i]->s.k = IPPROTO_ROUTING;
|
|
|
|
i++;
|
|
|
|
/* if (A == IPPROTO_FRAGMENT) goto v6advance; else goto ahcheck; */
|
|
|
|
s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
|
|
|
|
s[i]->s.jt = NULL; /*later*/
|
|
|
|
s[i]->s.jf = NULL; /*later*/
|
|
|
|
s[i]->s.k = IPPROTO_FRAGMENT;
|
|
|
|
fix3 = i;
|
|
|
|
v6end = i;
|
|
|
|
i++;
|
|
|
|
|
|
|
|
/* v6advance: */
|
|
|
|
v6advance = i;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* in short,
|
2001-04-03 04:32:48 +00:00
|
|
|
* A = P[X];
|
|
|
|
* X = X + (P[X + 1] + 1) * 8;
|
2000-01-30 00:43:38 +00:00
|
|
|
*/
|
|
|
|
/* A = X */
|
|
|
|
s[i] = new_stmt(BPF_MISC|BPF_TXA);
|
|
|
|
i++;
|
2001-04-03 04:32:48 +00:00
|
|
|
/* A = P[X + packet head] */
|
|
|
|
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
|
|
|
|
s[i]->s.k = off_nl;
|
|
|
|
i++;
|
|
|
|
/* MEM[reg2] = A */
|
2000-01-30 00:43:38 +00:00
|
|
|
s[i] = new_stmt(BPF_ST);
|
2001-04-03 04:32:48 +00:00
|
|
|
s[i]->s.k = reg2;
|
|
|
|
i++;
|
|
|
|
/* A = X */
|
|
|
|
s[i] = new_stmt(BPF_MISC|BPF_TXA);
|
2000-01-30 00:43:38 +00:00
|
|
|
i++;
|
|
|
|
/* A += 1 */
|
|
|
|
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
|
|
|
|
s[i]->s.k = 1;
|
|
|
|
i++;
|
|
|
|
/* X = A */
|
|
|
|
s[i] = new_stmt(BPF_MISC|BPF_TAX);
|
|
|
|
i++;
|
|
|
|
/* A = P[X + packet head]; */
|
|
|
|
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
|
|
|
|
s[i]->s.k = off_nl;
|
|
|
|
i++;
|
|
|
|
/* A += 1 */
|
|
|
|
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
|
|
|
|
s[i]->s.k = 1;
|
|
|
|
i++;
|
|
|
|
/* A *= 8 */
|
|
|
|
s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K);
|
|
|
|
s[i]->s.k = 8;
|
|
|
|
i++;
|
|
|
|
/* X = A; */
|
|
|
|
s[i] = new_stmt(BPF_MISC|BPF_TAX);
|
|
|
|
i++;
|
|
|
|
/* A = MEM[reg2] */
|
|
|
|
s[i] = new_stmt(BPF_LD|BPF_MEM);
|
|
|
|
s[i]->s.k = reg2;
|
|
|
|
i++;
|
|
|
|
|
|
|
|
/* goto again; (must use BPF_JA for backward jump) */
|
|
|
|
s[i] = new_stmt(BPF_JMP|BPF_JA);
|
|
|
|
s[i]->s.k = again - i - 1;
|
|
|
|
s[i - 1]->s.jf = s[i];
|
|
|
|
i++;
|
|
|
|
|
|
|
|
/* fixup */
|
|
|
|
for (j = v6start; j <= v6end; j++)
|
|
|
|
s[j]->s.jt = s[v6advance];
|
|
|
|
} else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
/* nop */
|
|
|
|
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
|
|
|
|
s[i]->s.k = 0;
|
|
|
|
s[fix2]->s.jf = s[i];
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ahcheck: */
|
|
|
|
ahcheck = i;
|
|
|
|
/* if (A == IPPROTO_AH) then fall through; else goto end; */
|
|
|
|
s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
|
|
|
|
s[i]->s.jt = NULL; /*later*/
|
|
|
|
s[i]->s.jf = NULL; /*later*/
|
|
|
|
s[i]->s.k = IPPROTO_AH;
|
|
|
|
if (fix3)
|
|
|
|
s[fix3]->s.jf = s[ahcheck];
|
|
|
|
fix4 = i;
|
|
|
|
i++;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* in short,
|
2001-04-03 04:32:48 +00:00
|
|
|
* A = P[X];
|
|
|
|
* X = X + (P[X + 1] + 2) * 4;
|
2000-01-30 00:43:38 +00:00
|
|
|
*/
|
|
|
|
/* A = X */
|
|
|
|
s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA);
|
|
|
|
i++;
|
|
|
|
/* A = P[X + packet head]; */
|
|
|
|
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
|
|
|
|
s[i]->s.k = off_nl;
|
|
|
|
i++;
|
|
|
|
/* MEM[reg2] = A */
|
|
|
|
s[i] = new_stmt(BPF_ST);
|
|
|
|
s[i]->s.k = reg2;
|
|
|
|
i++;
|
2001-04-03 04:32:48 +00:00
|
|
|
/* A = X */
|
|
|
|
s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA);
|
|
|
|
i++;
|
|
|
|
/* A += 1 */
|
|
|
|
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
|
|
|
|
s[i]->s.k = 1;
|
|
|
|
i++;
|
|
|
|
/* X = A */
|
|
|
|
s[i] = new_stmt(BPF_MISC|BPF_TAX);
|
2000-01-30 00:43:38 +00:00
|
|
|
i++;
|
|
|
|
/* A = P[X + packet head] */
|
|
|
|
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
|
|
|
|
s[i]->s.k = off_nl;
|
|
|
|
i++;
|
|
|
|
/* A += 2 */
|
|
|
|
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
|
|
|
|
s[i]->s.k = 2;
|
|
|
|
i++;
|
|
|
|
/* A *= 4 */
|
|
|
|
s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K);
|
|
|
|
s[i]->s.k = 4;
|
|
|
|
i++;
|
|
|
|
/* X = A; */
|
|
|
|
s[i] = new_stmt(BPF_MISC|BPF_TAX);
|
|
|
|
i++;
|
|
|
|
/* A = MEM[reg2] */
|
|
|
|
s[i] = new_stmt(BPF_LD|BPF_MEM);
|
|
|
|
s[i]->s.k = reg2;
|
|
|
|
i++;
|
|
|
|
|
|
|
|
/* goto again; (must use BPF_JA for backward jump) */
|
|
|
|
s[i] = new_stmt(BPF_JMP|BPF_JA);
|
|
|
|
s[i]->s.k = again - i - 1;
|
|
|
|
i++;
|
|
|
|
|
|
|
|
/* end: nop */
|
|
|
|
end = i;
|
|
|
|
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
|
|
|
|
s[i]->s.k = 0;
|
|
|
|
s[fix2]->s.jt = s[end];
|
|
|
|
s[fix4]->s.jf = s[end];
|
|
|
|
s[fix5]->s.jt = s[end];
|
|
|
|
i++;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* make slist chain
|
|
|
|
*/
|
|
|
|
max = i;
|
|
|
|
for (i = 0; i < max - 1; i++)
|
|
|
|
s[i]->next = s[i + 1];
|
|
|
|
s[max - 1]->next = NULL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* emit final check
|
|
|
|
*/
|
|
|
|
b = new_block(JMP(BPF_JEQ));
|
|
|
|
b->stmts = s[1]; /*remember, s[0] is dummy*/
|
|
|
|
b->s.k = v;
|
|
|
|
|
|
|
|
free_reg(reg2);
|
|
|
|
|
|
|
|
gen_and(b0, b);
|
|
|
|
return b;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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:
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
b0 = gen_proto(v, Q_IP, dir);
|
|
|
|
b1 = gen_proto(v, Q_IPV6, dir);
|
|
|
|
gen_or(b0, b1);
|
|
|
|
return b1;
|
|
|
|
#else
|
|
|
|
/*FALLTHROUGH*/
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
case Q_IP:
|
|
|
|
b0 = gen_linktype(ETHERTYPE_IP);
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifndef CHASE_CHAIN
|
1996-08-19 20:36:34 +00:00
|
|
|
b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)v);
|
2000-01-30 00:43:38 +00:00
|
|
|
#else
|
|
|
|
b1 = gen_protochain(v, Q_IP);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
|
1996-08-21 20:01:08 +00:00
|
|
|
case Q_ISO:
|
|
|
|
b0 = gen_linktype(LLC_ISO_LSAP);
|
|
|
|
b1 = gen_cmp(off_nl + 3, BPF_B, (long)v);
|
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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 */
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
case Q_PIM:
|
|
|
|
bpf_error("'pim proto' is bogus");
|
|
|
|
/* NOTREACHED */
|
|
|
|
|
|
|
|
#ifdef INET6
|
|
|
|
case Q_IPV6:
|
|
|
|
b0 = gen_linktype(ETHERTYPE_IPV6);
|
|
|
|
#ifndef CHASE_CHAIN
|
|
|
|
b1 = gen_cmp(off_nl + 6, BPF_B, (bpf_int32)v);
|
|
|
|
#else
|
|
|
|
b1 = gen_protochain(v, Q_IPV6);
|
|
|
|
#endif
|
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
|
|
|
|
case Q_ICMPV6:
|
|
|
|
bpf_error("'icmp6 proto' is bogus");
|
|
|
|
#endif /* INET6 */
|
|
|
|
|
|
|
|
case Q_AH:
|
|
|
|
bpf_error("'ah proto' is bogus");
|
|
|
|
|
|
|
|
case Q_ESP:
|
|
|
|
bpf_error("'ah proto' is bogus");
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
1997-05-27 00:05:23 +00:00
|
|
|
int tproto;
|
1996-08-19 20:36:34 +00:00
|
|
|
u_char *eaddr;
|
2001-04-03 04:32:48 +00:00
|
|
|
bpf_u_int32 mask, addr;
|
|
|
|
#ifndef INET6
|
|
|
|
bpf_u_int32 **alist;
|
|
|
|
#else
|
2000-01-30 00:43:38 +00:00
|
|
|
int tproto6;
|
|
|
|
struct sockaddr_in *sin;
|
|
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
struct addrinfo *res, *res0;
|
|
|
|
struct in6_addr mask128;
|
|
|
|
#endif /*INET6*/
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
case DLT_IEEE802:
|
|
|
|
eaddr = pcap_ether_hostton(name);
|
|
|
|
if (eaddr == NULL)
|
|
|
|
bpf_error(
|
|
|
|
"unknown token ring host '%s'", name);
|
|
|
|
return gen_thostop(eaddr, dir);
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
default:
|
|
|
|
bpf_error(
|
2001-04-03 04:32:48 +00:00
|
|
|
"only ethernet/FDDI/token ring supports link-level host name");
|
1996-08-19 20:36:34 +00:00
|
|
|
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 {
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifndef INET6
|
1996-08-19 20:36:34 +00:00
|
|
|
alist = pcap_nametoaddr(name);
|
|
|
|
if (alist == NULL || *alist == NULL)
|
|
|
|
bpf_error("unknown host '%s'", name);
|
1997-05-27 00:05:23 +00:00
|
|
|
tproto = proto;
|
|
|
|
if (off_linktype == -1 && tproto == Q_DEFAULT)
|
|
|
|
tproto = Q_IP;
|
|
|
|
b = gen_host(**alist++, 0xffffffff, tproto, dir);
|
1996-08-19 20:36:34 +00:00
|
|
|
while (*alist) {
|
|
|
|
tmp = gen_host(**alist++, 0xffffffff,
|
1997-05-27 00:05:23 +00:00
|
|
|
tproto, dir);
|
1996-08-19 20:36:34 +00:00
|
|
|
gen_or(b, tmp);
|
|
|
|
b = tmp;
|
|
|
|
}
|
|
|
|
return b;
|
2000-01-30 00:43:38 +00:00
|
|
|
#else
|
|
|
|
memset(&mask128, 0xff, sizeof(mask128));
|
2001-04-03 04:32:48 +00:00
|
|
|
res0 = res = pcap_nametoaddrinfo(name);
|
2000-01-30 00:43:38 +00:00
|
|
|
if (res == NULL)
|
|
|
|
bpf_error("unknown host '%s'", name);
|
|
|
|
b = tmp = NULL;
|
|
|
|
tproto = tproto6 = proto;
|
|
|
|
if (off_linktype == -1 && tproto == Q_DEFAULT) {
|
|
|
|
tproto = Q_IP;
|
|
|
|
tproto6 = Q_IPV6;
|
|
|
|
}
|
2000-03-04 23:57:39 +00:00
|
|
|
for (res = res0; res; res = res->ai_next) {
|
2000-01-30 00:43:38 +00:00
|
|
|
switch (res->ai_family) {
|
|
|
|
case AF_INET:
|
2000-03-04 23:57:39 +00:00
|
|
|
if (tproto == Q_IPV6)
|
|
|
|
continue;
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
sin = (struct sockaddr_in *)
|
|
|
|
res->ai_addr;
|
|
|
|
tmp = gen_host(ntohl(sin->sin_addr.s_addr),
|
|
|
|
0xffffffff, tproto, dir);
|
|
|
|
break;
|
|
|
|
case AF_INET6:
|
2000-03-04 23:57:39 +00:00
|
|
|
if (tproto6 == Q_IP)
|
|
|
|
continue;
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
sin6 = (struct sockaddr_in6 *)
|
|
|
|
res->ai_addr;
|
|
|
|
tmp = gen_host6(&sin6->sin6_addr,
|
|
|
|
&mask128, tproto6, dir);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (b)
|
|
|
|
gen_or(b, tmp);
|
|
|
|
b = tmp;
|
|
|
|
}
|
|
|
|
freeaddrinfo(res0);
|
2000-03-04 23:57:39 +00:00
|
|
|
if (b == NULL) {
|
|
|
|
bpf_error("unknown host '%s'%s", name,
|
|
|
|
(proto == Q_DEFAULT)
|
|
|
|
? ""
|
|
|
|
: " for specified address family");
|
|
|
|
}
|
2000-01-30 00:43:38 +00:00
|
|
|
return b;
|
|
|
|
#endif /*INET6*/
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifndef INET6
|
1996-08-19 20:36:34 +00:00
|
|
|
return gen_port(port, real_proto, dir);
|
2000-01-30 00:43:38 +00:00
|
|
|
#else
|
|
|
|
{
|
|
|
|
struct block *b;
|
|
|
|
b = gen_port(port, real_proto, dir);
|
|
|
|
gen_or(gen_port6(port, real_proto, dir), b);
|
|
|
|
return b;
|
|
|
|
}
|
|
|
|
#endif /* INET6 */
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
case Q_GATEWAY:
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifndef INET6
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
2000-01-30 00:43:38 +00:00
|
|
|
#else
|
|
|
|
bpf_error("'gateway' not supported in this configuration");
|
|
|
|
#endif /*INET6*/
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
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);
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
case Q_PROTOCHAIN:
|
|
|
|
real_proto = lookup_proto(name, proto);
|
|
|
|
if (real_proto >= 0)
|
|
|
|
return gen_protochain(real_proto, proto, dir);
|
|
|
|
else
|
|
|
|
bpf_error("unknown protocol: %s", name);
|
|
|
|
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
1998-09-15 19:31:43 +00:00
|
|
|
if ((n & ~m) != 0)
|
|
|
|
bpf_error("non-network bits set in \"%s mask %s\"",
|
|
|
|
s1, s2);
|
1996-08-19 20:36:34 +00:00
|
|
|
} else {
|
|
|
|
/* Convert mask len to mask */
|
|
|
|
if (masklen > 32)
|
|
|
|
bpf_error("mask length must be <= 32");
|
|
|
|
m = 0xffffffff << (32 - masklen);
|
1998-09-15 19:31:43 +00:00
|
|
|
if ((n & ~m) != 0)
|
|
|
|
bpf_error("non-network bits set in \"%s/%d\"",
|
|
|
|
s1, masklen);
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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'");
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifndef INET6
|
1996-08-19 20:36:34 +00:00
|
|
|
return gen_port((int)v, proto, dir);
|
2000-01-30 00:43:38 +00:00
|
|
|
#else
|
|
|
|
{
|
|
|
|
struct block *b;
|
|
|
|
b = gen_port((int)v, proto, dir);
|
|
|
|
gen_or(gen_port6((int)v, proto, dir), b);
|
|
|
|
return b;
|
|
|
|
}
|
|
|
|
#endif /* INET6 */
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
case Q_GATEWAY:
|
|
|
|
bpf_error("'gateway' requires a name");
|
|
|
|
/* NOTREACHED */
|
|
|
|
|
|
|
|
case Q_PROTO:
|
|
|
|
return gen_proto((int)v, proto, dir);
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
case Q_PROTOCHAIN:
|
|
|
|
return gen_protochain((int)v, proto, dir);
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
case Q_UNDEF:
|
|
|
|
syntax();
|
|
|
|
/* NOTREACHED */
|
|
|
|
|
|
|
|
default:
|
|
|
|
abort();
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
struct block *
|
|
|
|
gen_mcode6(s1, s2, masklen, q)
|
|
|
|
register const char *s1, *s2;
|
|
|
|
register int masklen;
|
|
|
|
struct qual q;
|
|
|
|
{
|
|
|
|
struct addrinfo *res;
|
|
|
|
struct in6_addr *addr;
|
|
|
|
struct in6_addr mask;
|
|
|
|
struct block *b;
|
|
|
|
u_int32_t *a, *m;
|
|
|
|
|
|
|
|
if (s2)
|
|
|
|
bpf_error("no mask %s supported", s2);
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
res = pcap_nametoaddrinfo(s1);
|
2000-01-30 00:43:38 +00:00
|
|
|
if (!res)
|
|
|
|
bpf_error("invalid ip6 address %s", s1);
|
|
|
|
if (res->ai_next)
|
|
|
|
bpf_error("%s resolved to multiple address", s1);
|
|
|
|
addr = &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
|
|
|
|
|
|
|
|
if (sizeof(mask) * 8 < masklen)
|
|
|
|
bpf_error("mask length must be <= %u", (unsigned int)(sizeof(mask) * 8));
|
|
|
|
memset(&mask, 0xff, masklen / 8);
|
|
|
|
if (masklen % 8) {
|
|
|
|
mask.s6_addr[masklen / 8] =
|
|
|
|
(0xff << (8 - masklen % 8)) & 0xff;
|
|
|
|
}
|
|
|
|
|
|
|
|
a = (u_int32_t *)addr;
|
|
|
|
m = (u_int32_t *)&mask;
|
|
|
|
if ((a[0] & ~m[0]) || (a[1] & ~m[1])
|
|
|
|
|| (a[2] & ~m[2]) || (a[3] & ~m[3])) {
|
|
|
|
bpf_error("non-network bits set in \"%s/%d\"", s1, masklen);
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (q.addr) {
|
|
|
|
|
|
|
|
case Q_DEFAULT:
|
|
|
|
case Q_HOST:
|
|
|
|
if (masklen != 128)
|
|
|
|
bpf_error("Mask syntax for networks only");
|
|
|
|
/* FALLTHROUGH */
|
|
|
|
|
|
|
|
case Q_NET:
|
|
|
|
b = gen_host6(addr, &mask, q.proto, q.dir);
|
|
|
|
freeaddrinfo(res);
|
|
|
|
return b;
|
|
|
|
|
|
|
|
default:
|
|
|
|
bpf_error("invalid qualifier against IPv6 address");
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /*INET6*/
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
2001-04-03 04:32:48 +00:00
|
|
|
if (linktype == DLT_IEEE802)
|
|
|
|
return gen_thostop(eaddr, (int)q.dir);
|
|
|
|
bpf_error("ethernet addresses supported only on ethernet, FDDI or token ring");
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
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:
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
case Q_IPV6:
|
|
|
|
#endif
|
1996-08-21 20:01:08 +00:00
|
|
|
/* XXX Note that we assume a fixed link header here. */
|
1996-08-19 20:36:34 +00:00
|
|
|
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:
|
2000-01-30 00:43:38 +00:00
|
|
|
case Q_PIM:
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
gen_and(gen_proto_abbrev(Q_IP), b);
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
index->b = b;
|
|
|
|
break;
|
2000-01-30 00:43:38 +00:00
|
|
|
#ifdef INET6
|
|
|
|
case Q_ICMPV6:
|
|
|
|
bpf_error("IPv6 upper-layer protocol is not supported by proto[x]");
|
|
|
|
/*NOTREACHED*/
|
|
|
|
#endif
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
1996-08-21 20:01:08 +00:00
|
|
|
/*
|
|
|
|
* Actually, this is less than or equal.
|
|
|
|
*/
|
1996-08-19 20:36:34 +00:00
|
|
|
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);
|
2001-04-03 04:32:48 +00:00
|
|
|
if (linktype == DLT_IEEE802)
|
|
|
|
return gen_thostop(ebroadcast, Q_DST);
|
1996-08-19 20:36:34 +00:00
|
|
|
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;
|
|
|
|
}
|
2001-04-03 04:32:48 +00:00
|
|
|
|
|
|
|
/* TODO - check how token ring handles multicast */
|
|
|
|
/* if (linktype == DLT_IEEE802) ... */
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
/* 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;
|
2000-01-30 00:43:38 +00:00
|
|
|
|
|
|
|
#ifdef INET6
|
|
|
|
case Q_IPV6:
|
|
|
|
b0 = gen_linktype(ETHERTYPE_IPV6);
|
|
|
|
b1 = gen_cmp(off_nl + 24, BPF_B, (bpf_int32)255);
|
|
|
|
gen_and(b0, b1);
|
|
|
|
return b1;
|
|
|
|
#endif /* INET6 */
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
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;
|
|
|
|
|
2001-04-03 04:32:48 +00:00
|
|
|
/*
|
|
|
|
* Only some data link types support inbound/outbound qualifiers.
|
|
|
|
*/
|
|
|
|
switch (linktype) {
|
|
|
|
case DLT_SLIP:
|
|
|
|
case DLT_PPP:
|
|
|
|
b0 = gen_relation(BPF_JEQ,
|
1996-08-19 20:36:34 +00:00
|
|
|
gen_load(Q_LINK, gen_loadi(0), 1),
|
|
|
|
gen_loadi(0),
|
|
|
|
dir);
|
2001-04-03 04:32:48 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
bpf_error("inbound/outbound not supported on linktype %d\n",
|
|
|
|
linktype);
|
|
|
|
b0 = NULL;
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
return (b0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* support IEEE 802.1Q VLAN trunk over ethernet
|
|
|
|
*/
|
|
|
|
struct block *
|
|
|
|
gen_vlan(vlan_num)
|
|
|
|
int vlan_num;
|
|
|
|
{
|
|
|
|
static u_int orig_linktype = -1, orig_nl = -1;
|
|
|
|
struct block *b0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Change the offsets to point to the type and data fields within
|
|
|
|
* the VLAN packet. This is somewhat of a kludge.
|
|
|
|
*/
|
|
|
|
if (orig_nl == (u_int)-1) {
|
|
|
|
orig_linktype = off_linktype; /* save original values */
|
|
|
|
orig_nl = off_nl;
|
|
|
|
|
|
|
|
switch (linktype) {
|
|
|
|
|
|
|
|
case DLT_EN10MB:
|
|
|
|
off_linktype = 16;
|
|
|
|
off_nl = 18;
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
bpf_error("no VLAN support for data link type %d",
|
|
|
|
linktype);
|
|
|
|
/*NOTREACHED*/
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* check for VLAN */
|
|
|
|
b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)ETHERTYPE_8021Q);
|
|
|
|
|
|
|
|
/* If a specific VLAN is requested, check VLAN id */
|
|
|
|
if (vlan_num >= 0) {
|
|
|
|
struct block *b1;
|
|
|
|
|
|
|
|
b1 = gen_cmp(orig_nl, BPF_H, (bpf_int32)vlan_num);
|
|
|
|
gen_and(b0, b1);
|
|
|
|
b0 = b1;
|
|
|
|
}
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
return (b0);
|
|
|
|
}
|