Dmitry V. Levin
bc515c7f54
* bpf_sock_filter.c: New file. * Makefile.am (strace_SOURCES): Add it. * xlat/skf_ad.in: New file. * defs.h (decode_sock_fprog, print_sock_fprog): New prototypes. * fetch_bpf_fprog.c (get_bpf_fprog_size): New mpers printer. * net.c (print_getsockopt): Use decode_sock_fprog to print socket filter programs for SO_GET_FILTER socket option. (print_setsockopt): Use decode_sock_fprog and get_bpf_fprog_size to print socket filter programs for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options. * NEWS: Mention this.
72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
/*
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* Decoder of socket filter programs.
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*
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* Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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#include "bpf_filter.h"
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#include <linux/filter.h>
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#include "xlat/skf_ad.h"
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static bool
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print_sock_filter_k(const struct bpf_filter_block *const fp)
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{
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if (BPF_CLASS(fp->code) == BPF_LD && BPF_MODE(fp->code) == BPF_ABS) {
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if (fp->k >= (unsigned int) SKF_AD_OFF) {
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tprints("SKF_AD_OFF+");
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printxval(skf_ad, fp->k - (unsigned int) SKF_AD_OFF,
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"SKF_AD_???");
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return true;
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} else if (fp->k >= (unsigned int) SKF_NET_OFF) {
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tprintf("%s+%u", "SKF_NET_OFF",
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fp->k - (unsigned int) SKF_NET_OFF);
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return true;
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} else if (fp->k >= (unsigned int) SKF_LL_OFF) {
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tprintf("%s+%u", "SKF_LL_OFF",
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fp->k - (unsigned int) SKF_LL_OFF);
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return true;
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}
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}
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return false;
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}
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void
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print_sock_fprog(struct tcb *const tcp, const kernel_ulong_t addr,
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const unsigned short len)
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{
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print_bpf_fprog(tcp, addr, len, print_sock_filter_k);
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}
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void
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decode_sock_fprog(struct tcb *const tcp, const kernel_ulong_t addr)
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{
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decode_bpf_fprog(tcp, addr, print_sock_filter_k);
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}
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