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NetBSD/external/bsd/libpcap/dist/bpf_image.c

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/* $NetBSD: bpf_image.c,v 1.6 2023/08/17 15:18:12 christos Exp $ */
/*
* Copyright (c) 1990, 1991, 1992, 1994, 1995, 1996
* 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: bpf_image.c,v 1.6 2023/08/17 15:18:12 christos Exp $");
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pcap-types.h>
#include <stdio.h>
#include <string.h>
#ifdef __linux__
#include <linux/types.h>
#include <linux/if_packet.h>
#include <linux/filter.h>
/*
* We want our versions of these #defines, not Linux's version.
* (The two should be the same; if not, we have a problem; all BPF
* implementations *should* be source-compatible supersets of ours.)
*/
#undef BPF_STMT
#undef BPF_JUMP
#endif
#include "pcap-int.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#ifdef SKF_AD_OFF
/*
* Symbolic names for offsets that refer to the special Linux BPF locations.
*/
static const char *offsets[SKF_AD_MAX] = {
#ifdef SKF_AD_PROTOCOL
[SKF_AD_PROTOCOL] = "proto",
#endif
#ifdef SKF_AD_PKTTYPE
[SKF_AD_PKTTYPE] = "type",
#endif
#ifdef SKF_AD_IFINDEX
[SKF_AD_IFINDEX] = "ifidx",
#endif
#ifdef SKF_AD_NLATTR
[SKF_AD_NLATTR] = "nla",
#endif
#ifdef SKF_AD_NLATTR_NEST
[SKF_AD_NLATTR_NEST] = "nlan",
#endif
#ifdef SKF_AD_MARK
[SKF_AD_MARK] = "mark",
#endif
#ifdef SKF_AD_QUEUE
[SKF_AD_QUEUE] = "queue",
#endif
#ifdef SKF_AD_HATYPE
[SKF_AD_HATYPE] = "hatype",
#endif
#ifdef SKF_AD_RXHASH
[SKF_AD_RXHASH] = "rxhash",
#endif
#ifdef SKF_AD_CPU
[SKF_AD_CPU] = "cpu",
#endif
#ifdef SKF_AD_ALU_XOR_X
[SKF_AD_ALU_XOR_X] = "xor_x",
#endif
#ifdef SKF_AD_VLAN_TAG
[SKF_AD_VLAN_TAG] = "vlan_tci",
#endif
#ifdef SKF_AD_VLAN_TAG_PRESENT
[SKF_AD_VLAN_TAG_PRESENT] = "vlanp",
#endif
#ifdef SKF_AD_PAY_OFFSET
[SKF_AD_PAY_OFFSET] = "poff",
#endif
#ifdef SKF_AD_RANDOM
[SKF_AD_RANDOM] = "random",
#endif
#ifdef SKF_AD_VLAN_TPID
[SKF_AD_VLAN_TPID] = "vlan_tpid"
#endif
};
#endif
static void
bpf_print_abs_load_operand(char *buf, size_t bufsize, const struct bpf_insn *p)
{
#ifdef SKF_AD_OFF
const char *sym;
/*
* It's an absolute load.
* Is the offset a special Linux offset that we know about?
*/
if (p->k >= (bpf_u_int32)SKF_AD_OFF &&
p->k < (bpf_u_int32)(SKF_AD_OFF + SKF_AD_MAX) &&
(sym = offsets[p->k - (bpf_u_int32)SKF_AD_OFF]) != NULL) {
/*
* Yes. Print the offset symbolically.
*/
(void)snprintf(buf, bufsize, "[%s]", sym);
} else
#endif
(void)snprintf(buf, bufsize, "[%d]", p->k);
}
char *
bpf_image(const struct bpf_insn *p, int n)
{
const char *op;
static char image[256];
char operand_buf[64];
const char *operand;
switch (p->code) {
default:
op = "unimp";
(void)snprintf(operand_buf, sizeof operand_buf, "0x%x", p->code);
operand = operand_buf;
break;
case BPF_RET|BPF_K:
op = "ret";
(void)snprintf(operand_buf, sizeof operand_buf, "#%d", p->k);
operand = operand_buf;
break;
case BPF_RET|BPF_A:
op = "ret";
operand = "";
break;
case BPF_LD|BPF_W|BPF_ABS:
op = "ld";
bpf_print_abs_load_operand(operand_buf, sizeof operand_buf, p);
operand = operand_buf;
break;
case BPF_LD|BPF_H|BPF_ABS:
op = "ldh";
bpf_print_abs_load_operand(operand_buf, sizeof operand_buf, p);
operand = operand_buf;
break;
case BPF_LD|BPF_B|BPF_ABS:
op = "ldb";
bpf_print_abs_load_operand(operand_buf, sizeof operand_buf, p);
operand = operand_buf;
break;
case BPF_LD|BPF_W|BPF_LEN:
op = "ld";
operand = "#pktlen";
break;
case BPF_LD|BPF_W|BPF_IND:
op = "ld";
(void)snprintf(operand_buf, sizeof operand_buf, "[x + %d]", p->k);
operand = operand_buf;
break;
case BPF_LD|BPF_H|BPF_IND:
op = "ldh";
(void)snprintf(operand_buf, sizeof operand_buf, "[x + %d]", p->k);
operand = operand_buf;
break;
case BPF_LD|BPF_B|BPF_IND:
op = "ldb";
(void)snprintf(operand_buf, sizeof operand_buf, "[x + %d]", p->k);
operand = operand_buf;
break;
case BPF_LD|BPF_IMM:
op = "ld";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_LDX|BPF_IMM:
op = "ldx";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_LDX|BPF_MSH|BPF_B:
op = "ldxb";
(void)snprintf(operand_buf, sizeof operand_buf, "4*([%d]&0xf)", p->k);
operand = operand_buf;
break;
case BPF_LD|BPF_MEM:
op = "ld";
(void)snprintf(operand_buf, sizeof operand_buf, "M[%d]", p->k);
operand = operand_buf;
break;
case BPF_LDX|BPF_MEM:
op = "ldx";
(void)snprintf(operand_buf, sizeof operand_buf, "M[%d]", p->k);
operand = operand_buf;
break;
case BPF_ST:
op = "st";
(void)snprintf(operand_buf, sizeof operand_buf, "M[%d]", p->k);
operand = operand_buf;
break;
case BPF_STX:
op = "stx";
(void)snprintf(operand_buf, sizeof operand_buf, "M[%d]", p->k);
operand = operand_buf;
break;
case BPF_JMP|BPF_JA:
op = "ja";
(void)snprintf(operand_buf, sizeof operand_buf, "%d", n + 1 + p->k);
operand = operand_buf;
break;
case BPF_JMP|BPF_JGT|BPF_K:
op = "jgt";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_JMP|BPF_JGE|BPF_K:
op = "jge";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_JMP|BPF_JEQ|BPF_K:
op = "jeq";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_JMP|BPF_JSET|BPF_K:
op = "jset";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_JMP|BPF_JGT|BPF_X:
op = "jgt";
operand = "x";
break;
case BPF_JMP|BPF_JGE|BPF_X:
op = "jge";
operand = "x";
break;
case BPF_JMP|BPF_JEQ|BPF_X:
op = "jeq";
operand = "x";
break;
case BPF_JMP|BPF_JSET|BPF_X:
op = "jset";
operand = "x";
break;
case BPF_ALU|BPF_ADD|BPF_X:
op = "add";
operand = "x";
break;
case BPF_ALU|BPF_SUB|BPF_X:
op = "sub";
operand = "x";
break;
case BPF_ALU|BPF_MUL|BPF_X:
op = "mul";
operand = "x";
break;
case BPF_ALU|BPF_DIV|BPF_X:
op = "div";
operand = "x";
break;
case BPF_ALU|BPF_MOD|BPF_X:
op = "mod";
operand = "x";
break;
case BPF_ALU|BPF_AND|BPF_X:
op = "and";
operand = "x";
break;
case BPF_ALU|BPF_OR|BPF_X:
op = "or";
operand = "x";
break;
case BPF_ALU|BPF_XOR|BPF_X:
op = "xor";
operand = "x";
break;
case BPF_ALU|BPF_LSH|BPF_X:
op = "lsh";
operand = "x";
break;
case BPF_ALU|BPF_RSH|BPF_X:
op = "rsh";
operand = "x";
break;
case BPF_ALU|BPF_ADD|BPF_K:
op = "add";
(void)snprintf(operand_buf, sizeof operand_buf, "#%d", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_SUB|BPF_K:
op = "sub";
(void)snprintf(operand_buf, sizeof operand_buf, "#%d", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_MUL|BPF_K:
op = "mul";
(void)snprintf(operand_buf, sizeof operand_buf, "#%d", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_DIV|BPF_K:
op = "div";
(void)snprintf(operand_buf, sizeof operand_buf, "#%d", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_MOD|BPF_K:
op = "mod";
(void)snprintf(operand_buf, sizeof operand_buf, "#%d", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_AND|BPF_K:
op = "and";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_OR|BPF_K:
op = "or";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_XOR|BPF_K:
op = "xor";
(void)snprintf(operand_buf, sizeof operand_buf, "#0x%x", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_LSH|BPF_K:
op = "lsh";
(void)snprintf(operand_buf, sizeof operand_buf, "#%d", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_RSH|BPF_K:
op = "rsh";
(void)snprintf(operand_buf, sizeof operand_buf, "#%d", p->k);
operand = operand_buf;
break;
case BPF_ALU|BPF_NEG:
op = "neg";
operand = "";
break;
case BPF_MISC|BPF_TAX:
op = "tax";
operand = "";
break;
case BPF_MISC|BPF_TXA:
op = "txa";
operand = "";
break;
}
if (BPF_CLASS(p->code) == BPF_JMP && BPF_OP(p->code) != BPF_JA) {
(void)snprintf(image, sizeof image,
"(%03d) %-8s %-16s jt %d\tjf %d",
n, op, operand, n + 1 + p->jt, n + 1 + p->jf);
} else {
(void)snprintf(image, sizeof image,
"(%03d) %-8s %s",
n, op, operand);
}
return image;
}
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