aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/bpf/net/bpf_filter.c
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/bpf/net/bpf_filter.c')
-rw-r--r--target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/bpf/net/bpf_filter.c532
1 files changed, 0 insertions, 532 deletions
diff --git a/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/bpf/net/bpf_filter.c b/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/bpf/net/bpf_filter.c
deleted file mode 100644
index d3dcc689a9..0000000000
--- a/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/bpf/net/bpf_filter.c
+++ /dev/null
@@ -1,532 +0,0 @@
-/*-
- * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from the Stanford/CMU enet packet filter,
- * (net/enet.c) distributed as part of 4.3BSD, and code contributed
- * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
- * Berkeley Laboratory.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)bpf.c 7.5 (Berkeley) 7/15/91
- */
-
-#if !(defined(lint) || defined(KERNEL))
-static const char rcsid[] =
- "@(#) $Header: /usr/local/cvs/linux/tools/build/e100boot/libpcap-0.4/bpf/net/bpf_filter.c,v 1.1 1999/08/26 10:07:57 johana Exp $ (LBL)";
-#endif
-
-#include <sys/param.h>
-#include <sys/types.h>
-#include <sys/time.h>
-#include <net/bpf.h>
-
-#ifndef KERNEL
-#include <stdlib.h>
-#endif
-
-#define int32 bpf_int32
-#define u_int32 bpf_u_int32
-
-#ifndef LBL_ALIGN
-#if defined(sparc) || defined(mips) || defined(ibm032) || \
- defined(__alpha) || defined(__hpux)
-#define LBL_ALIGN
-#endif
-#endif
-
-#ifndef LBL_ALIGN
-#include <netinet/in.h>
-
-#define EXTRACT_SHORT(p) ((u_short)ntohs(*(u_short *)p))
-#define EXTRACT_LONG(p) (ntohl(*(u_int32 *)p))
-#else
-#define EXTRACT_SHORT(p)\
- ((u_short)\
- ((u_short)*((u_char *)p+0)<<8|\
- (u_short)*((u_char *)p+1)<<0))
-#define EXTRACT_LONG(p)\
- ((u_int32)*((u_char *)p+0)<<24|\
- (u_int32)*((u_char *)p+1)<<16|\
- (u_int32)*((u_char *)p+2)<<8|\
- (u_int32)*((u_char *)p+3)<<0)
-#endif
-
-#ifdef KERNEL
-#include <sys/mbuf.h>
-#define MINDEX(len, m, k) \
-{ \
- len = m->m_len; \
- while (k >= len) { \
- k -= len; \
- m = m->m_next; \
- if (m == 0) \
- return 0; \
- len = m->m_len; \
- } \
-}
-
-static int
-m_xword(m, k, err)
- register struct mbuf *m;
- register int k, *err;
-{
- register int len;
- register u_char *cp, *np;
- register struct mbuf *m0;
-
- MINDEX(len, m, k);
- cp = mtod(m, u_char *) + k;
- if (len - k >= 4) {
- *err = 0;
- return EXTRACT_LONG(cp);
- }
- m0 = m->m_next;
- if (m0 == 0 || m0->m_len + len - k < 4)
- goto bad;
- *err = 0;
- np = mtod(m0, u_char *);
- switch (len - k) {
-
- case 1:
- return (cp[0] << 24) | (np[0] << 16) | (np[1] << 8) | np[2];
-
- case 2:
- return (cp[0] << 24) | (cp[1] << 16) | (np[0] << 8) | np[1];
-
- default:
- return (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | np[0];
- }
- bad:
- *err = 1;
- return 0;
-}
-
-static int
-m_xhalf(m, k, err)
- register struct mbuf *m;
- register int k, *err;
-{
- register int len;
- register u_char *cp;
- register struct mbuf *m0;
-
- MINDEX(len, m, k);
- cp = mtod(m, u_char *) + k;
- if (len - k >= 2) {
- *err = 0;
- return EXTRACT_SHORT(cp);
- }
- m0 = m->m_next;
- if (m0 == 0)
- goto bad;
- *err = 0;
- return (cp[0] << 8) | mtod(m0, u_char *)[0];
- bad:
- *err = 1;
- return 0;
-}
-#endif
-
-/*
- * Execute the filter program starting at pc on the packet p
- * wirelen is the length of the original packet
- * buflen is the amount of data present
- */
-u_int
-bpf_filter(pc, p, wirelen, buflen)
- register struct bpf_insn *pc;
- register u_char *p;
- u_int wirelen;
- register u_int buflen;
-{
- register u_int32 A, X;
- register int k;
- int32 mem[BPF_MEMWORDS];
-
- if (pc == 0)
- /*
- * No filter means accept all.
- */
- return (u_int)-1;
- A = 0;
- X = 0;
- --pc;
- while (1) {
- ++pc;
- switch (pc->code) {
-
- default:
-#ifdef KERNEL
- return 0;
-#else
- abort();
-#endif
- case BPF_RET|BPF_K:
- return (u_int)pc->k;
-
- case BPF_RET|BPF_A:
- return (u_int)A;
-
- case BPF_LD|BPF_W|BPF_ABS:
- k = pc->k;
- if (k + sizeof(int32) > buflen) {
-#ifdef KERNEL
- int merr;
-
- if (buflen != 0)
- return 0;
- A = m_xword((struct mbuf *)p, k, &merr);
- if (merr != 0)
- return 0;
- continue;
-#else
- return 0;
-#endif
- }
- A = EXTRACT_LONG(&p[k]);
- continue;
-
- case BPF_LD|BPF_H|BPF_ABS:
- k = pc->k;
- if (k + sizeof(short) > buflen) {
-#ifdef KERNEL
- int merr;
-
- if (buflen != 0)
- return 0;
- A = m_xhalf((struct mbuf *)p, k, &merr);
- continue;
-#else
- return 0;
-#endif
- }
- A = EXTRACT_SHORT(&p[k]);
- continue;
-
- case BPF_LD|BPF_B|BPF_ABS:
- k = pc->k;
- if (k >= buflen) {
-#ifdef KERNEL
- register struct mbuf *m;
- register int len;
-
- if (buflen != 0)
- return 0;
- m = (struct mbuf *)p;
- MINDEX(len, m, k);
- A = mtod(m, u_char *)[k];
- continue;
-#else
- return 0;
-#endif
- }
- A = p[k];
- continue;
-
- case BPF_LD|BPF_W|BPF_LEN:
- A = wirelen;
- continue;
-
- case BPF_LDX|BPF_W|BPF_LEN:
- X = wirelen;
- continue;
-
- case BPF_LD|BPF_W|BPF_IND:
- k = X + pc->k;
- if (k + sizeof(int32) > buflen) {
-#ifdef KERNEL
- int merr;
-
- if (buflen != 0)
- return 0;
- A = m_xword((struct mbuf *)p, k, &merr);
- if (merr != 0)
- return 0;
- continue;
-#else
- return 0;
-#endif
- }
- A = EXTRACT_LONG(&p[k]);
- continue;
-
- case BPF_LD|BPF_H|BPF_IND:
- k = X + pc->k;
- if (k + sizeof(short) > buflen) {
-#ifdef KERNEL
- int merr;
-
- if (buflen != 0)
- return 0;
- A = m_xhalf((struct mbuf *)p, k, &merr);
- if (merr != 0)
- return 0;
- continue;
-#else
- return 0;
-#endif
- }
- A = EXTRACT_SHORT(&p[k]);
- continue;
-
- case BPF_LD|BPF_B|BPF_IND:
- k = X + pc->k;
- if (k >= buflen) {
-#ifdef KERNEL
- register struct mbuf *m;
- register int len;
-
- if (buflen != 0)
- return 0;
- m = (struct mbuf *)p;
- MINDEX(len, m, k);
- A = mtod(m, u_char *)[k];
- continue;
-#else
- return 0;
-#endif
- }
- A = p[k];
- continue;
-
- case BPF_LDX|BPF_MSH|BPF_B:
- k = pc->k;
- if (k >= buflen) {
-#ifdef KERNEL
- register struct mbuf *m;
- register int len;
-
- if (buflen != 0)
- return 0;
- m = (struct mbuf *)p;
- MINDEX(len, m, k);
- X = (mtod(m, char *)[k] & 0xf) << 2;
- continue;
-#else
- return 0;
-#endif
- }
- X = (p[pc->k] & 0xf) << 2;
- continue;
-
- case BPF_LD|BPF_IMM:
- A = pc->k;
- continue;
-
- case BPF_LDX|BPF_IMM:
- X = pc->k;
- continue;
-
- case BPF_LD|BPF_MEM:
- A = mem[pc->k];
- continue;
-
- case BPF_LDX|BPF_MEM:
- X = mem[pc->k];
- continue;
-
- case BPF_ST:
- mem[pc->k] = A;
- continue;
-
- case BPF_STX:
- mem[pc->k] = X;
- continue;
-
- case BPF_JMP|BPF_JA:
- pc += pc->k;
- continue;
-
- case BPF_JMP|BPF_JGT|BPF_K:
- pc += (A > pc->k) ? pc->jt : pc->jf;
- continue;
-
- case BPF_JMP|BPF_JGE|BPF_K:
- pc += (A >= pc->k) ? pc->jt : pc->jf;
- continue;
-
- case BPF_JMP|BPF_JEQ|BPF_K:
- pc += (A == pc->k) ? pc->jt : pc->jf;
- continue;
-
- case BPF_JMP|BPF_JSET|BPF_K:
- pc += (A & pc->k) ? pc->jt : pc->jf;
- continue;
-
- case BPF_JMP|BPF_JGT|BPF_X:
- pc += (A > X) ? pc->jt : pc->jf;
- continue;
-
- case BPF_JMP|BPF_JGE|BPF_X:
- pc += (A >= X) ? pc->jt : pc->jf;
- continue;
-
- case BPF_JMP|BPF_JEQ|BPF_X:
- pc += (A == X) ? pc->jt : pc->jf;
- continue;
-
- case BPF_JMP|BPF_JSET|BPF_X:
- pc += (A & X) ? pc->jt : pc->jf;
- continue;
-
- case BPF_ALU|BPF_ADD|BPF_X:
- A += X;
- continue;
-
- case BPF_ALU|BPF_SUB|BPF_X:
- A -= X;
- continue;
-
- case BPF_ALU|BPF_MUL|BPF_X:
- A *= X;
- continue;
-
- case BPF_ALU|BPF_DIV|BPF_X:
- if (X == 0)
- return 0;
- A /= X;
- continue;
-
- case BPF_ALU|BPF_AND|BPF_X:
- A &= X;
- continue;
-
- case BPF_ALU|BPF_OR|BPF_X:
- A |= X;
- continue;
-
- case BPF_ALU|BPF_LSH|BPF_X:
- A <<= X;
- continue;
-
- case BPF_ALU|BPF_RSH|BPF_X:
- A >>= X;
- continue;
-
- case BPF_ALU|BPF_ADD|BPF_K:
- A += pc->k;
- continue;
-
- case BPF_ALU|BPF_SUB|BPF_K:
- A -= pc->k;
- continue;
-
- case BPF_ALU|BPF_MUL|BPF_K:
- A *= pc->k;
- continue;
-
- case BPF_ALU|BPF_DIV|BPF_K:
- A /= pc->k;
- continue;
-
- case BPF_ALU|BPF_AND|BPF_K:
- A &= pc->k;
- continue;
-
- case BPF_ALU|BPF_OR|BPF_K:
- A |= pc->k;
- continue;
-
- case BPF_ALU|BPF_LSH|BPF_K:
- A <<= pc->k;
- continue;
-
- case BPF_ALU|BPF_RSH|BPF_K:
- A >>= pc->k;
- continue;
-
- case BPF_ALU|BPF_NEG:
- A = -A;
- continue;
-
- case BPF_MISC|BPF_TAX:
- X = A;
- continue;
-
- case BPF_MISC|BPF_TXA:
- A = X;
- continue;
- }
- }
-}
-
-#ifdef KERNEL
-/*
- * Return true if the 'fcode' is a valid filter program.
- * The constraints are that each jump be forward and to a valid
- * code. The code must terminate with either an accept or reject.
- * 'valid' is an array for use by the routine (it must be at least
- * 'len' bytes long).
- *
- * The kernel needs to be able to verify an application's filter code.
- * Otherwise, a bogus program could easily crash the system.
- */
-int
-bpf_validate(f, len)
- struct bpf_insn *f;
- int len;
-{
- register int i;
- register struct bpf_insn *p;
-
- for (i = 0; i < len; ++i) {
- /*
- * Check that that jumps are forward, and within
- * the code block.
- */
- p = &f[i];
- if (BPF_CLASS(p->code) == BPF_JMP) {
- register int from = i + 1;
-
- if (BPF_OP(p->code) == BPF_JA) {
- if (from + p->k >= (unsigned)len)
- return 0;
- }
- else if (from + p->jt >= len || from + p->jf >= len)
- return 0;
- }
- /*
- * Check that memory operations use valid addresses.
- */
- if ((BPF_CLASS(p->code) == BPF_ST ||
- (BPF_CLASS(p->code) == BPF_LD &&
- (p->code & 0xe0) == BPF_MEM)) &&
- (p->k >= BPF_MEMWORDS || p->k < 0))
- return 0;
- /*
- * Check for constant division by 0.
- */
- if (p->code == (BPF_ALU|BPF_DIV|BPF_K) && p->k == 0)
- return 0;
- }
- return BPF_CLASS(f[len - 1].code) == BPF_RET;
-}
-#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-06 16:34:35 +0000