strace/bpf.c
Dmitry V. Levin 7fa3d78319 Automatically replace kernel_(scno|ureg)_t with kernel_ulong_t
Remove temporary types created for transition from long
to kernel_ulong_t.

Automatically replace kernel_scno_t and kernel_ureg_t with
kernel_ulong_t using
$ git grep -El 'kernel_(scno|ureg)_t' |
  xargs sed -ri 's/kernel_(scno|ureg)_t/kernel_ulong_t/g'

* kernel_types.h (kernel_scno_t, kernel_ureg_t): Remove.
All users updated.
2016-12-26 10:43:34 +00:00

221 lines
5.7 KiB
C

/*
* Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
* 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"
#ifdef HAVE_LINUX_BPF_H
# include <linux/bpf.h>
#endif
#include "xlat/bpf_commands.h"
#include "xlat/bpf_map_types.h"
#include "xlat/bpf_prog_types.h"
#include "xlat/bpf_map_update_elem_flags.h"
static int
bpf_map_create(struct tcb *const tcp, const kernel_ulong_t addr,
unsigned int size)
{
struct {
uint32_t map_type, key_size, value_size, max_entries;
} attr = {};
if (!size) {
printaddr(addr);
return RVAL_DECODED | RVAL_FD;
}
if (size > sizeof(attr))
size = sizeof(attr);
if (umoven_or_printaddr(tcp, addr, size, &attr))
return RVAL_DECODED | RVAL_FD;
tprints("{map_type=");
printxval(bpf_map_types, attr.map_type, "BPF_MAP_TYPE_???");
tprintf(", key_size=%u, value_size=%u, max_entries=%u}",
attr.key_size, attr.value_size, attr.max_entries);
return RVAL_DECODED | RVAL_FD;
}
static void
bpf_map_update_elem(struct tcb *const tcp, const kernel_ulong_t addr,
unsigned int size)
{
struct {
uint32_t map_fd;
uint64_t ATTRIBUTE_ALIGNED(8) key;
uint64_t ATTRIBUTE_ALIGNED(8) value;
uint64_t flags;
} attr = {};
if (!size) {
printaddr(addr);
return;
}
if (size > sizeof(attr))
size = sizeof(attr);
if (umoven_or_printaddr(tcp, addr, size, &attr))
return;
tprints("{map_fd=");
printfd(tcp, attr.map_fd);
tprintf(", key=%#" PRIx64 ", value=%#" PRIx64 ", flags=",
attr.key, attr.value);
printxval64(bpf_map_update_elem_flags, attr.flags, "BPF_???");
tprints("}");
}
static void
bpf_map_delete_elem(struct tcb *const tcp, const kernel_ulong_t addr,
unsigned int size)
{
struct {
uint32_t map_fd;
uint64_t ATTRIBUTE_ALIGNED(8) key;
} attr = {};
if (!size) {
printaddr(addr);
return;
}
if (size > sizeof(attr))
size = sizeof(attr);
if (umoven_or_printaddr(tcp, addr, size, &attr))
return;
tprints("{map_fd=");
printfd(tcp, attr.map_fd);
tprintf(", key=%#" PRIx64 "}", attr.key);
}
static int
bpf_map_io(struct tcb *const tcp, const kernel_ulong_t addr, unsigned int size,
const char *const text)
{
struct bpf_io_elem_struct {
uint32_t map_fd;
uint64_t ATTRIBUTE_ALIGNED(8) key;
uint64_t ATTRIBUTE_ALIGNED(8) value;
} attr = {};
if (exiting(tcp)) {
if (!syserror(tcp) && !umove_or_printaddr(tcp, addr, &attr))
tprintf(", %s=%#" PRIx64, text, attr.value);
tprints("}");
return RVAL_DECODED;
}
if (!size) {
printaddr(addr);
return RVAL_DECODED;
}
if (size > sizeof(attr))
size = sizeof(attr);
if (umoven_or_printaddr(tcp, addr, size, &attr))
return RVAL_DECODED;
tprints("{map_fd=");
printfd(tcp, attr.map_fd);
tprintf(", key=%#" PRIx64, attr.key);
return 0;
}
static int
bpf_prog_load(struct tcb *const tcp, const kernel_ulong_t addr,
unsigned int size)
{
struct {
uint32_t prog_type, insn_cnt;
uint64_t ATTRIBUTE_ALIGNED(8) insns, license;
uint32_t log_level, log_size;
uint64_t ATTRIBUTE_ALIGNED(8) log_buf;
uint32_t kern_version;
} attr = {};
if (!size) {
printaddr(addr);
return RVAL_DECODED | RVAL_FD;
}
if (size > sizeof(attr))
size = sizeof(attr);
if (umoven_or_printaddr(tcp, addr, size, &attr))
return RVAL_DECODED | RVAL_FD;
tprints("{prog_type=");
printxval(bpf_prog_types, attr.prog_type, "BPF_PROG_TYPE_???");
tprintf(", insn_cnt=%u, insns=%#" PRIx64 ", license=",
attr.insn_cnt, attr.insns);
printstr(tcp, attr.license);
tprintf(", log_level=%u, log_size=%u, log_buf=%#" PRIx64 ", kern_version=%u}",
attr.log_level, attr.log_size, attr.log_buf, attr.kern_version);
return RVAL_DECODED | RVAL_FD;
}
SYS_FUNC(bpf)
{
const unsigned int cmd = tcp->u_arg[0];
const kernel_ulong_t addr = tcp->u_arg[1];
const unsigned int size = tcp->u_arg[2];
int rc = RVAL_DECODED;
if (entering(tcp)) {
printxval(bpf_commands, cmd, "BPF_???");
tprints(", ");
}
switch (cmd) {
case BPF_MAP_CREATE:
rc = bpf_map_create(tcp, addr, size);
break;
case BPF_MAP_LOOKUP_ELEM:
rc = bpf_map_io(tcp, addr, size, "value");
break;
case BPF_MAP_UPDATE_ELEM:
bpf_map_update_elem(tcp, addr, size);
break;
case BPF_MAP_DELETE_ELEM:
bpf_map_delete_elem(tcp, addr, size);
break;
case BPF_MAP_GET_NEXT_KEY:
rc = bpf_map_io(tcp, addr, size, "next_key");
break;
case BPF_PROG_LOAD:
rc = bpf_prog_load(tcp, addr, size);
break;
default:
printaddr(addr);
break;
}
if (rc & RVAL_DECODED)
tprintf(", %u", size);
return rc;
}