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/*
* Decoder of socket filter programs.
*
* Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2017-2018 The strace developers.
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include "defs.h"
#include "bpf_filter.h"
#include <linux/filter.h>
#include "xlat/skf_ad.h"
#include "xlat/skf_off.h"
static bool
print_sock_filter_k(const struct bpf_filter_block *const fp)
{
if (BPF_CLASS(fp->code) == BPF_LD && BPF_MODE(fp->code) == BPF_ABS) {
if (fp->k >= (unsigned int) SKF_AD_OFF) {
print_xlat32(SKF_AD_OFF);
tprints("+");
printxval(skf_ad, fp->k - (unsigned int) SKF_AD_OFF,
"SKF_AD_???");
return true;
} else if (fp->k >= (unsigned int) SKF_NET_OFF) {
print_xlat32(SKF_NET_OFF);
tprintf("+%u", fp->k - (unsigned int) SKF_NET_OFF);
return true;
} else if (fp->k >= (unsigned int) SKF_LL_OFF) {
print_xlat32(SKF_LL_OFF);
tprintf("+%u", fp->k - (unsigned int) SKF_LL_OFF);
return true;
}
}
return false;
}
void
print_sock_fprog(struct tcb *const tcp, const kernel_ulong_t addr,
const unsigned short len)
{
print_bpf_fprog(tcp, addr, len, print_sock_filter_k);
}
void
decode_sock_fprog(struct tcb *const tcp, const kernel_ulong_t addr)
{
decode_bpf_fprog(tcp, addr, print_sock_filter_k);
}
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