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tools: bpf: add bpftool

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Add a simple tool for querying and updating BPF objects on the system.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-10-04 20:10:04 -07:00 committed by David S. Miller
parent a92bb546cf
commit 71bb428fe2
8 changed files with 1909 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

18
tools/bpf/Makefile
View file

@ -3,6 +3,7 @@ prefix = /usr
CC = gcc
LEX = flex
YACC = bison
MAKE = make
CFLAGS += -Wall -O2
CFLAGS += -D__EXPORTED_HEADERS__ -I../../include/uapi -I../../include
@ -13,7 +14,7 @@ CFLAGS += -D__EXPORTED_HEADERS__ -I../../include/uapi -I../../include
%.lex.c: %.l
$(LEX) -o $@ $<
all : bpf_jit_disasm bpf_dbg bpf_asm
all: bpf_jit_disasm bpf_dbg bpf_asm bpftool
bpf_jit_disasm : CFLAGS += -DPACKAGE='bpf_jit_disasm'
bpf_jit_disasm : LDLIBS = -lopcodes -lbfd -ldl
@ -26,10 +27,21 @@ bpf_asm : LDLIBS =
bpf_asm : bpf_asm.o bpf_exp.yacc.o bpf_exp.lex.o
bpf_exp.lex.o : bpf_exp.yacc.c
clean :
clean: bpftool_clean
rm -rf *.o bpf_jit_disasm bpf_dbg bpf_asm bpf_exp.yacc.* bpf_exp.lex.*
install :
install: bpftool_install
install bpf_jit_disasm $(prefix)/bin/bpf_jit_disasm
install bpf_dbg $(prefix)/bin/bpf_dbg
install bpf_asm $(prefix)/bin/bpf_asm
bpftool:
$(MAKE) -C bpftool
bpftool_install:
$(MAKE) -C bpftool install
bpftool_clean:
$(MAKE) -C bpftool clean
.PHONY: bpftool FORCE

80
tools/bpf/bpftool/Makefile Normal file
View file

@ -0,0 +1,80 @@
include ../../scripts/Makefile.include
include ../../scripts/utilities.mak
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
#$(info Determined 'srctree' to be $(srctree))
endif
ifneq ($(objtree),)
#$(info Determined 'objtree' to be $(objtree))
endif
ifneq ($(OUTPUT),)
#$(info Determined 'OUTPUT' to be $(OUTPUT))
# Adding $(OUTPUT) as a directory to look for source files,
# because use generated output files as sources dependency
# for flex/bison parsers.
VPATH += $(OUTPUT)
export VPATH
endif
ifeq ($(V),1)
Q =
else
Q = @
endif
BPF_DIR = $(srctree)/tools/lib/bpf/
ifneq ($(OUTPUT),)
BPF_PATH=$(OUTPUT)
else
BPF_PATH=$(BPF_DIR)
endif
LIBBPF = $(BPF_PATH)libbpf.a
$(LIBBPF): FORCE
$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(OUTPUT) $(OUTPUT)libbpf.a FEATURES_DUMP=$(FEATURE_DUMP_EXPORT)
$(LIBBPF)-clean:
$(call QUIET_CLEAN, libbpf)
$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(OUTPUT) clean >/dev/null
prefix = /usr
CC = gcc
CFLAGS += -O2
CFLAGS += -W -Wall -Wextra -Wno-unused-parameter -Wshadow
CFLAGS += -D__EXPORTED_HEADERS__ -I$(srctree)/tools/include/uapi -I$(srctree)/tools/include -I$(srctree)/tools/lib/bpf
LIBS = -lelf -lbfd -lopcodes $(LIBBPF)
include $(wildcard *.d)
all: $(OUTPUT)bpftool
SRCS=$(wildcard *.c)
OBJS=$(patsubst %.c,$(OUTPUT)%.o,$(SRCS))
$(OUTPUT)bpftool: $(OBJS) $(LIBBPF)
$(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
$(OUTPUT)%.o: %.c
$(QUIET_CC)$(COMPILE.c) -MMD -o $@ $<
clean: $(LIBBPF)-clean
$(call QUIET_CLEAN, bpftool)
$(Q)rm -rf $(OUTPUT)bpftool $(OUTPUT)*.o $(OUTPUT)*.d
install:
install $(OUTPUT)bpftool $(prefix)/sbin/bpftool
FORCE:
.PHONY: all clean FORCE
.DEFAULT_GOAL := all

216
tools/bpf/bpftool/common.c Normal file
View file

@ -0,0 +1,216 @@
/*
* Copyright (C) 2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* Author: Jakub Kicinski <kubakici@wp.pl> */
#include <errno.h>
#include <libgen.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/limits.h>
#include <linux/magic.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include <bpf.h>
#include "main.h"
static bool is_bpffs(char *path)
{
struct statfs st_fs;
if (statfs(path, &st_fs) < 0)
return false;
return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
}
int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
{
enum bpf_obj_type type;
int fd;
fd = bpf_obj_get(path);
if (fd < 0) {
err("bpf obj get (%s): %s\n", path,
errno == EACCES && !is_bpffs(dirname(path)) ?
"directory not in bpf file system (bpffs)" :
strerror(errno));
return -1;
}
type = get_fd_type(fd);
if (type < 0) {
close(fd);
return type;
}
if (type != exp_type) {
err("incorrect object type: %s\n", get_fd_type_name(type));
close(fd);
return -1;
}
return fd;
}
int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
{
unsigned int id;
char *endptr;
int err;
int fd;
if (!is_prefix(*argv, "id")) {
err("expected 'id' got %s\n", *argv);
return -1;
}
NEXT_ARG();
id = strtoul(*argv, &endptr, 0);
if (*endptr) {
err("can't parse %s as ID\n", *argv);
return -1;
}
NEXT_ARG();
if (argc != 1)
usage();
fd = get_fd_by_id(id);
if (fd < 0) {
err("can't get prog by id (%u): %s\n", id, strerror(errno));
return -1;
}
err = bpf_obj_pin(fd, *argv);
close(fd);
if (err) {
err("can't pin the object (%s): %s\n", *argv,
errno == EACCES && !is_bpffs(dirname(*argv)) ?
"directory not in bpf file system (bpffs)" :
strerror(errno));
return -1;
}
return 0;
}
const char *get_fd_type_name(enum bpf_obj_type type)
{
static const char * const names[] = {
[BPF_OBJ_UNKNOWN] = "unknown",
[BPF_OBJ_PROG] = "prog",
[BPF_OBJ_MAP] = "map",
};
if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
return names[BPF_OBJ_UNKNOWN];
return names[type];
}
int get_fd_type(int fd)
{
char path[PATH_MAX];
char buf[512];
ssize_t n;
snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd);
n = readlink(path, buf, sizeof(buf));
if (n < 0) {
err("can't read link type: %s\n", strerror(errno));
return -1;
}
if (n == sizeof(path)) {
err("can't read link type: path too long!\n");
return -1;
}
if (strstr(buf, "bpf-map"))
return BPF_OBJ_MAP;
else if (strstr(buf, "bpf-prog"))
return BPF_OBJ_PROG;
return BPF_OBJ_UNKNOWN;
}
char *get_fdinfo(int fd, const char *key)
{
char path[PATH_MAX];
char *line = NULL;
size_t line_n = 0;
ssize_t n;
FILE *fdi;
snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd);
fdi = fopen(path, "r");
if (!fdi) {
err("can't open fdinfo: %s\n", strerror(errno));
return NULL;
}
while ((n = getline(&line, &line_n, fdi))) {
char *value;
int len;
if (!strstr(line, key))
continue;
fclose(fdi);
value = strchr(line, '\t');
if (!value || !value[1]) {
err("malformed fdinfo!?\n");
free(line);
return NULL;
}
value++;
len = strlen(value);
memmove(line, value, len);
line[len - 1] = '\0';
return line;
}
err("key '%s' not found in fdinfo\n", key);
free(line);
fclose(fdi);
return NULL;
}

87
tools/bpf/bpftool/jit_disasm.c Normal file
View file

@ -0,0 +1,87 @@
/*
* Based on:
*
* Minimal BPF JIT image disassembler
*
* Disassembles BPF JIT compiler emitted opcodes back to asm insn's for
* debugging or verification purposes.
*
* Copyright 2013 Daniel Borkmann <daniel@iogearbox.net>
* Licensed under the GNU General Public License, version 2.0 (GPLv2)
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <bfd.h>
#include <dis-asm.h>
#include <sys/types.h>
#include <sys/stat.h>
static void get_exec_path(char *tpath, size_t size)
{
ssize_t len;
char *path;
snprintf(tpath, size, "/proc/%d/exe", (int) getpid());
tpath[size - 1] = 0;
path = strdup(tpath);
assert(path);
len = readlink(path, tpath, size - 1);
assert(len > 0);
tpath[len] = 0;
free(path);
}
void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes)
{
disassembler_ftype disassemble;
struct disassemble_info info;
int count, i, pc = 0;
char tpath[256];
bfd *bfdf;
if (!len)
return;
memset(tpath, 0, sizeof(tpath));
get_exec_path(tpath, sizeof(tpath));
bfdf = bfd_openr(tpath, NULL);
assert(bfdf);
assert(bfd_check_format(bfdf, bfd_object));
init_disassemble_info(&info, stdout, (fprintf_ftype) fprintf);
info.arch = bfd_get_arch(bfdf);
info.mach = bfd_get_mach(bfdf);
info.buffer = image;
info.buffer_length = len;
disassemble_init_for_target(&info);
disassemble = disassembler(bfdf);
assert(disassemble);
do {
printf("%4x:\t", pc);
count = disassemble(pc, &info);
if (opcodes) {
printf("\n\t");
for (i = 0; i < count; ++i)
printf("%02x ", (uint8_t) image[pc + i]);
}
printf("\n");
pc += count;
} while (count > 0 && pc < len);
bfd_close(bfdf);
}

212
tools/bpf/bpftool/main.c Normal file
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@ -0,0 +1,212 @@
/*
* Copyright (C) 2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* Author: Jakub Kicinski <kubakici@wp.pl> */
#include <bfd.h>
#include <ctype.h>
#include <errno.h>
#include <linux/bpf.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <bpf.h>
#include "main.h"
const char *bin_name;
static int last_argc;
static char **last_argv;
static int (*last_do_help)(int argc, char **argv);
void usage(void)
{
last_do_help(last_argc - 1, last_argv + 1);
exit(-1);
}
static int do_help(int argc, char **argv)
{
fprintf(stderr,
"Usage: %s OBJECT { COMMAND | help }\n"
" %s batch file FILE\n"
"\n"
" OBJECT := { prog | map }\n",
bin_name, bin_name);
return 0;
}
int cmd_select(const struct cmd *cmds, int argc, char **argv,
int (*help)(int argc, char **argv))
{
unsigned int i;
last_argc = argc;
last_argv = argv;
last_do_help = help;
if (argc < 1 && cmds[0].func)
return cmds[0].func(argc, argv);
for (i = 0; cmds[i].func; i++)
if (is_prefix(*argv, cmds[i].cmd))
return cmds[i].func(argc - 1, argv + 1);
help(argc - 1, argv + 1);
return -1;
}
bool is_prefix(const char *pfx, const char *str)
{
if (!pfx)
return false;
if (strlen(str) < strlen(pfx))
return false;
return !memcmp(str, pfx, strlen(pfx));
}
void print_hex(void *arg, unsigned int n, const char *sep)
{
unsigned char *data = arg;
unsigned int i;
for (i = 0; i < n; i++) {
const char *pfx = "";
if (!i)
/* nothing */;
else if (!(i % 16))
printf("\n");
else if (!(i % 8))
printf(" ");
else
pfx = sep;
printf("%s%02hhx", i ? pfx : "", data[i]);
}
}
static int do_batch(int argc, char **argv);
static const struct cmd cmds[] = {
{ "help", do_help },
{ "batch", do_batch },
{ "prog", do_prog },
{ "map", do_map },
{ 0 }
};
static int do_batch(int argc, char **argv)
{
unsigned int lines = 0;
char *n_argv[4096];
char buf[65536];
int n_argc;
FILE *fp;
int err;
if (argc < 2) {
err("too few parameters for batch\n");
return -1;
} else if (!is_prefix(*argv, "file")) {
err("expected 'file', got: %s\n", *argv);
return -1;
} else if (argc > 2) {
err("too many parameters for batch\n");
return -1;
}
NEXT_ARG();
fp = fopen(*argv, "r");
if (!fp) {
err("Can't open file (%s): %s\n", *argv, strerror(errno));
return -1;
}
while (fgets(buf, sizeof(buf), fp)) {
if (strlen(buf) == sizeof(buf) - 1) {
errno = E2BIG;
break;
}
n_argc = 0;
n_argv[n_argc] = strtok(buf, " \t\n");
while (n_argv[n_argc]) {
n_argc++;
if (n_argc == ARRAY_SIZE(n_argv)) {
err("line %d has too many arguments, skip\n",
lines);
n_argc = 0;
break;
}
n_argv[n_argc] = strtok(NULL, " \t\n");
}
if (!n_argc)
continue;
err = cmd_select(cmds, n_argc, n_argv, do_help);
if (err)
goto err_close;
lines++;
}
if (errno && errno != ENOENT) {
perror("reading batch file failed");
err = -1;
} else {
info("processed %d lines\n", lines);
err = 0;
}
err_close:
fclose(fp);
return err;
}
int main(int argc, char **argv)
{
bin_name = argv[0];
NEXT_ARG();
bfd_init();
return cmd_select(cmds, argc, argv, do_help);
}

99
tools/bpf/bpftool/main.h Normal file
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@ -0,0 +1,99 @@
/*
* Copyright (C) 2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* Author: Jakub Kicinski <kubakici@wp.pl> */
#ifndef __BPF_TOOL_H
#define __BPF_TOOL_H
#include <stdbool.h>
#include <stdio.h>
#include <linux/bpf.h>
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
#define err(msg...) fprintf(stderr, "Error: " msg)
#define warn(msg...) fprintf(stderr, "Warning: " msg)
#define info(msg...) fprintf(stderr, msg)
#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
#define min(a, b) \
({ typeof(a) _a = (a); typeof(b) _b = (b); _a > _b ? _b : _a; })
#define max(a, b) \
({ typeof(a) _a = (a); typeof(b) _b = (b); _a < _b ? _b : _a; })
#define NEXT_ARG() ({ argc--; argv++; if (argc < 0) usage(); })
#define NEXT_ARGP() ({ (*argc)--; (*argv)++; if (*argc < 0) usage(); })
#define BAD_ARG() ({ err("what is '%s'?\n", *argv); -1; })
#define BPF_TAG_FMT "%02hhx:%02hhx:%02hhx:%02hhx:" \
"%02hhx:%02hhx:%02hhx:%02hhx"
#define HELP_SPEC_PROGRAM \
"PROG := { id PROG_ID | pinned FILE | tag PROG_TAG }"
enum bpf_obj_type {
BPF_OBJ_UNKNOWN,
BPF_OBJ_PROG,
BPF_OBJ_MAP,
};
extern const char *bin_name;
bool is_prefix(const char *pfx, const char *str);
void print_hex(void *arg, unsigned int n, const char *sep);
void usage(void) __attribute__((noreturn));
struct cmd {
const char *cmd;
int (*func)(int argc, char **argv);
};
int cmd_select(const struct cmd *cmds, int argc, char **argv,
int (*help)(int argc, char **argv));
int get_fd_type(int fd);
const char *get_fd_type_name(enum bpf_obj_type type);
char *get_fdinfo(int fd, const char *key);
int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type);
int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32));
int do_prog(int argc, char **arg);
int do_map(int argc, char **arg);
int prog_parse_fd(int *argc, char ***argv);
void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes);
#endif

744
tools/bpf/bpftool/map.c Normal file
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@ -0,0 +1,744 @@
/*
* Copyright (C) 2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* Author: Jakub Kicinski <kubakici@wp.pl> */
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <bpf.h>
#include "main.h"
static const char * const map_type_name[] = {
[BPF_MAP_TYPE_UNSPEC] = "unspec",
[BPF_MAP_TYPE_HASH] = "hash",
[BPF_MAP_TYPE_ARRAY] = "array",
[BPF_MAP_TYPE_PROG_ARRAY] = "prog_array",
[BPF_MAP_TYPE_PERF_EVENT_ARRAY] = "perf_event_array",
[BPF_MAP_TYPE_PERCPU_HASH] = "percpu_hash",
[BPF_MAP_TYPE_PERCPU_ARRAY] = "percpu_array",
[BPF_MAP_TYPE_STACK_TRACE] = "stack_trace",
[BPF_MAP_TYPE_CGROUP_ARRAY] = "cgroup_array",
[BPF_MAP_TYPE_LRU_HASH] = "lru_hash",
[BPF_MAP_TYPE_LRU_PERCPU_HASH] = "lru_percpu_hash",
[BPF_MAP_TYPE_LPM_TRIE] = "lpm_trie",
[BPF_MAP_TYPE_ARRAY_OF_MAPS] = "array_of_maps",
[BPF_MAP_TYPE_HASH_OF_MAPS] = "hash_of_maps",
[BPF_MAP_TYPE_DEVMAP] = "devmap",
[BPF_MAP_TYPE_SOCKMAP] = "sockmap",
};
static unsigned int get_possible_cpus(void)
{
static unsigned int result;
char buf[128];
long int n;
char *ptr;
int fd;
if (result)
return result;
fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
if (fd < 0) {
err("can't open sysfs possible cpus\n");
exit(-1);
}
n = read(fd, buf, sizeof(buf));
if (n < 2) {
err("can't read sysfs possible cpus\n");
exit(-1);
}
close(fd);
if (n == sizeof(buf)) {
err("read sysfs possible cpus overflow\n");
exit(-1);
}
ptr = buf;
n = 0;
while (*ptr && *ptr != '\n') {
unsigned int a, b;
if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
n += b - a + 1;
ptr = strchr(ptr, '-') + 1;
} else if (sscanf(ptr, "%u", &a) == 1) {
n++;
} else {
assert(0);
}
while (isdigit(*ptr))
ptr++;
if (*ptr == ',')
ptr++;
}
result = n;
return result;
}
static bool map_is_per_cpu(__u32 type)
{
return type == BPF_MAP_TYPE_PERCPU_HASH ||
type == BPF_MAP_TYPE_PERCPU_ARRAY ||
type == BPF_MAP_TYPE_LRU_PERCPU_HASH;
}
static bool map_is_map_of_maps(__u32 type)
{
return type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
type == BPF_MAP_TYPE_HASH_OF_MAPS;
}
static bool map_is_map_of_progs(__u32 type)
{
return type == BPF_MAP_TYPE_PROG_ARRAY;
}
static void *alloc_value(struct bpf_map_info *info)
{
if (map_is_per_cpu(info->type))
return malloc(info->value_size * get_possible_cpus());
else
return malloc(info->value_size);
}
static int map_parse_fd(int *argc, char ***argv)
{
int fd;
if (is_prefix(**argv, "id")) {
unsigned int id;
char *endptr;
NEXT_ARGP();
id = strtoul(**argv, &endptr, 0);
if (*endptr) {
err("can't parse %s as ID\n", **argv);
return -1;
}
NEXT_ARGP();
fd = bpf_map_get_fd_by_id(id);
if (fd < 0)
err("get map by id (%u): %s\n", id, strerror(errno));
return fd;
} else if (is_prefix(**argv, "pinned")) {
char *path;
NEXT_ARGP();
path = **argv;
NEXT_ARGP();
return open_obj_pinned_any(path, BPF_OBJ_MAP);
}
err("expected 'id' or 'pinned', got: '%s'?\n", **argv);
return -1;
}
static int
map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
{
int err;
int fd;
fd = map_parse_fd(argc, argv);
if (fd < 0)
return -1;
err = bpf_obj_get_info_by_fd(fd, info, info_len);
if (err) {
err("can't get map info: %s\n", strerror(errno));
close(fd);
return err;
}
return fd;
}
static void print_entry(struct bpf_map_info *info, unsigned char *key,
unsigned char *value)
{
if (!map_is_per_cpu(info->type)) {
bool single_line, break_names;
break_names = info->key_size > 16 || info->value_size > 16;
single_line = info->key_size + info->value_size <= 24 &&
!break_names;
printf("key:%c", break_names ? '\n' : ' ');
print_hex(key, info->key_size, " ");
printf(single_line ? " " : "\n");
printf("value:%c", break_names ? '\n' : ' ');
print_hex(value, info->value_size, " ");
printf("\n");
} else {
unsigned int i, n;
n = get_possible_cpus();
printf("key:\n");
print_hex(key, info->key_size, " ");
printf("\n");
for (i = 0; i < n; i++) {
printf("value (CPU %02d):%c",
i, info->value_size > 16 ? '\n' : ' ');
print_hex(value + i * info->value_size,
info->value_size, " ");
printf("\n");
}
}
}
static char **parse_bytes(char **argv, const char *name, unsigned char *val,
unsigned int n)
{
unsigned int i = 0;
char *endptr;
while (i < n && argv[i]) {
val[i] = strtoul(argv[i], &endptr, 0);
if (*endptr) {
err("error parsing byte: %s\n", argv[i]);
break;
}
i++;
}
if (i != n) {
err("%s expected %d bytes got %d\n", name, n, i);
return NULL;
}
return argv + i;
}
static int parse_elem(char **argv, struct bpf_map_info *info,
void *key, void *value, __u32 key_size, __u32 value_size,
__u32 *flags, __u32 **value_fd)
{
if (!*argv) {
if (!key && !value)
return 0;
err("did not find %s\n", key ? "key" : "value");
return -1;
}
if (is_prefix(*argv, "key")) {
if (!key) {
if (key_size)
err("duplicate key\n");
else
err("unnecessary key\n");
return -1;
}
argv = parse_bytes(argv + 1, "key", key, key_size);
if (!argv)
return -1;
return parse_elem(argv, info, NULL, value, key_size, value_size,
flags, value_fd);
} else if (is_prefix(*argv, "value")) {
int fd;
if (!value) {
if (value_size)
err("duplicate value\n");
else
err("unnecessary value\n");
return -1;
}
argv++;
if (map_is_map_of_maps(info->type)) {
int argc = 2;
if (value_size != 4) {
err("value smaller than 4B for map in map?\n");
return -1;
}
if (!argv[0] || !argv[1]) {
err("not enough value arguments for map in map\n");
return -1;
}
fd = map_parse_fd(&argc, &argv);
if (fd < 0)
return -1;
*value_fd = value;
**value_fd = fd;
} else if (map_is_map_of_progs(info->type)) {
int argc = 2;
if (value_size != 4) {
err("value smaller than 4B for map of progs?\n");
return -1;
}
if (!argv[0] || !argv[1]) {
err("not enough value arguments for map of progs\n");
return -1;
}
fd = prog_parse_fd(&argc, &argv);
if (fd < 0)
return -1;
*value_fd = value;
**value_fd = fd;
} else {
argv = parse_bytes(argv, "value", value, value_size);
if (!argv)
return -1;
}
return parse_elem(argv, info, key, NULL, key_size, value_size,
flags, NULL);
} else if (is_prefix(*argv, "any") || is_prefix(*argv, "noexist") ||
is_prefix(*argv, "exist")) {
if (!flags) {
err("flags specified multiple times: %s\n", *argv);
return -1;
}
if (is_prefix(*argv, "any"))
*flags = BPF_ANY;
else if (is_prefix(*argv, "noexist"))
*flags = BPF_NOEXIST;
else if (is_prefix(*argv, "exist"))
*flags = BPF_EXIST;
return parse_elem(argv + 1, info, key, value, key_size,
value_size, NULL, value_fd);
}
err("expected key or value, got: %s\n", *argv);
return -1;
}
static int show_map_close(int fd, struct bpf_map_info *info)
{
char *memlock;
memlock = get_fdinfo(fd, "memlock");
close(fd);
printf("%u: ", info->id);
if (info->type < ARRAY_SIZE(map_type_name))
printf("%s ", map_type_name[info->type]);
else
printf("type %u ", info->type);
if (*info->name)
printf("name %s ", info->name);
printf("flags 0x%x\n", info->map_flags);
printf("\tkey %uB value %uB max_entries %u",
info->key_size, info->value_size, info->max_entries);
if (memlock)
printf(" memlock %sB", memlock);
free(memlock);
printf("\n");
return 0;
}
static int do_show(int argc, char **argv)
{
struct bpf_map_info info = {};
__u32 len = sizeof(info);
__u32 id = 0;
int err;
int fd;
if (argc == 2) {
fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
if (fd < 0)
return -1;
return show_map_close(fd, &info);
}
if (argc)
return BAD_ARG();
while (true) {
err = bpf_map_get_next_id(id, &id);
if (err) {
if (errno == ENOENT)
break;
err("can't get next map: %s\n", strerror(errno));
if (errno == EINVAL)
err("kernel too old?\n");
return -1;
}
fd = bpf_map_get_fd_by_id(id);
if (fd < 0) {
err("can't get map by id (%u): %s\n",
id, strerror(errno));
return -1;
}
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
err("can't get map info: %s\n", strerror(errno));
close(fd);
return -1;
}
show_map_close(fd, &info);
}
return errno == ENOENT ? 0 : -1;
}
static int do_dump(int argc, char **argv)
{
void *key, *value, *prev_key;
unsigned int num_elems = 0;
struct bpf_map_info info = {};
__u32 len = sizeof(info);
int err;
int fd;
if (argc != 2)
usage();
fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
if (fd < 0)
return -1;
if (map_is_map_of_maps(info.type) || map_is_map_of_progs(info.type)) {
err("Dumping maps of maps and program maps not supported\n");
close(fd);
return -1;
}
key = malloc(info.key_size);
value = alloc_value(&info);
if (!key || !value) {
err("mem alloc failed\n");
err = -1;
goto exit_free;
}
prev_key = NULL;
while (true) {
err = bpf_map_get_next_key(fd, prev_key, key);
if (err) {
if (errno == ENOENT)
err = 0;
break;
}
if (!bpf_map_lookup_elem(fd, key, value)) {
print_entry(&info, key, value);
} else {
info("can't lookup element with key: ");
print_hex(key, info.key_size, " ");
printf("\n");
}
prev_key = key;
num_elems++;
}
printf("Found %u element%s\n", num_elems, num_elems != 1 ? "s" : "");
exit_free:
free(key);
free(value);
close(fd);
return err;
}
static int do_update(int argc, char **argv)
{
struct bpf_map_info info = {};
__u32 len = sizeof(info);
__u32 *value_fd = NULL;
__u32 flags = BPF_ANY;
void *key, *value;
int fd, err;
if (argc < 2)
usage();
fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
if (fd < 0)
return -1;
key = malloc(info.key_size);
value = alloc_value(&info);
if (!key || !value) {
err("mem alloc failed");
err = -1;
goto exit_free;
}
err = parse_elem(argv, &info, key, value, info.key_size,
info.value_size, &flags, &value_fd);
if (err)
goto exit_free;
err = bpf_map_update_elem(fd, key, value, flags);
if (err) {
err("update failed: %s\n", strerror(errno));
goto exit_free;
}
exit_free:
if (value_fd)
close(*value_fd);
free(key);
free(value);
close(fd);
return err;
}
static int do_lookup(int argc, char **argv)
{
struct bpf_map_info info = {};
__u32 len = sizeof(info);
void *key, *value;
int err;
int fd;
if (argc < 2)
usage();
fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
if (fd < 0)
return -1;
key = malloc(info.key_size);
value = alloc_value(&info);
if (!key || !value) {
err("mem alloc failed");
err = -1;
goto exit_free;
}
err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
if (err)
goto exit_free;
err = bpf_map_lookup_elem(fd, key, value);
if (!err) {
print_entry(&info, key, value);
} else if (errno == ENOENT) {
printf("key:\n");
print_hex(key, info.key_size, " ");
printf("\n\nNot found\n");
} else {
err("lookup failed: %s\n", strerror(errno));
}
exit_free:
free(key);
free(value);
close(fd);
return err;
}
static int do_getnext(int argc, char **argv)
{
struct bpf_map_info info = {};
__u32 len = sizeof(info);
void *key, *nextkey;
int err;
int fd;
if (argc < 2)
usage();
fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
if (fd < 0)
return -1;
key = malloc(info.key_size);
nextkey = malloc(info.key_size);
if (!key || !nextkey) {
err("mem alloc failed");
err = -1;
goto exit_free;
}
if (argc) {
err = parse_elem(argv, &info, key, NULL, info.key_size, 0,
NULL, NULL);
if (err)
goto exit_free;
} else {
free(key);
key = NULL;
}
err = bpf_map_get_next_key(fd, key, nextkey);
if (err) {
err("can't get next key: %s\n", strerror(errno));
goto exit_free;
}
if (key) {
printf("key:\n");
print_hex(key, info.key_size, " ");
printf("\n");
} else {
printf("key: None\n");
}
printf("next key:\n");
print_hex(nextkey, info.key_size, " ");
printf("\n");
exit_free:
free(nextkey);
free(key);
close(fd);
return err;
}
static int do_delete(int argc, char **argv)
{
struct bpf_map_info info = {};
__u32 len = sizeof(info);
void *key;
int err;
int fd;
if (argc < 2)
usage();
fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
if (fd < 0)
return -1;
key = malloc(info.key_size);
if (!key) {
err("mem alloc failed");
err = -1;
goto exit_free;
}
err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
if (err)
goto exit_free;
err = bpf_map_delete_elem(fd, key);
if (err)
err("delete failed: %s\n", strerror(errno));
exit_free:
free(key);
close(fd);
return err;
}
static int do_pin(int argc, char **argv)
{
return do_pin_any(argc, argv, bpf_map_get_fd_by_id);
}
static int do_help(int argc, char **argv)
{
fprintf(stderr,
"Usage: %s %s show [MAP]\n"
" %s %s dump MAP\n"
" %s %s update MAP key BYTES value VALUE [UPDATE_FLAGS]\n"
" %s %s lookup MAP key BYTES\n"
" %s %s getnext MAP [key BYTES]\n"
" %s %s delete MAP key BYTES\n"
" %s %s pin MAP FILE\n"
" %s %s help\n"
"\n"
" MAP := { id MAP_ID | pinned FILE }\n"
" " HELP_SPEC_PROGRAM "\n"
" VALUE := { BYTES | MAP | PROG }\n"
" UPDATE_FLAGS := { any | exist | noexist }\n"
"",
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2]);
return 0;
}
static const struct cmd cmds[] = {
{ "show", do_show },
{ "help", do_help },
{ "dump", do_dump },
{ "update", do_update },
{ "lookup", do_lookup },
{ "getnext", do_getnext },
{ "delete", do_delete },
{ "pin", do_pin },
{ 0 }
};
int do_map(int argc, char **argv)
{
return cmd_select(cmds, argc, argv, do_help);
}

456
tools/bpf/bpftool/prog.c Normal file
View file

@ -0,0 +1,456 @@
/*
* Copyright (C) 2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* Author: Jakub Kicinski <kubakici@wp.pl> */
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <bpf.h>
#include "main.h"
static const char * const prog_type_name[] = {
[BPF_PROG_TYPE_UNSPEC] = "unspec",
[BPF_PROG_TYPE_SOCKET_FILTER] = "socket_filter",
[BPF_PROG_TYPE_KPROBE] = "kprobe",
[BPF_PROG_TYPE_SCHED_CLS] = "sched_cls",
[BPF_PROG_TYPE_SCHED_ACT] = "sched_act",
[BPF_PROG_TYPE_TRACEPOINT] = "tracepoint",
[BPF_PROG_TYPE_XDP] = "xdp",
[BPF_PROG_TYPE_PERF_EVENT] = "perf_event",
[BPF_PROG_TYPE_CGROUP_SKB] = "cgroup_skb",
[BPF_PROG_TYPE_CGROUP_SOCK] = "cgroup_sock",
[BPF_PROG_TYPE_LWT_IN] = "lwt_in",
[BPF_PROG_TYPE_LWT_OUT] = "lwt_out",
[BPF_PROG_TYPE_LWT_XMIT] = "lwt_xmit",
[BPF_PROG_TYPE_SOCK_OPS] = "sock_ops",
[BPF_PROG_TYPE_SK_SKB] = "sk_skb",
};
static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
{
struct timespec real_time_ts, boot_time_ts;
time_t wallclock_secs;
struct tm load_tm;
buf[--size] = '\0';
if (clock_gettime(CLOCK_REALTIME, &real_time_ts) ||
clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) {
perror("Can't read clocks");
snprintf(buf, size, "%llu", nsecs / 1000000000);
return;
}
wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
nsecs / 1000000000;
if (!localtime_r(&wallclock_secs, &load_tm)) {
snprintf(buf, size, "%llu", nsecs / 1000000000);
return;
}
strftime(buf, size, "%b %d/%H:%M", &load_tm);
}
static int prog_fd_by_tag(unsigned char *tag)
{
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
unsigned int id = 0;
int err;
int fd;
while (true) {
err = bpf_prog_get_next_id(id, &id);
if (err) {
err("%s\n", strerror(errno));
return -1;
}
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0) {
err("can't get prog by id (%u): %s\n",
id, strerror(errno));
return -1;
}
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
err("can't get prog info (%u): %s\n",
id, strerror(errno));
close(fd);
return -1;
}
if (!memcmp(tag, info.tag, BPF_TAG_SIZE))
return fd;
close(fd);
}
}
int prog_parse_fd(int *argc, char ***argv)
{
int fd;
if (is_prefix(**argv, "id")) {
unsigned int id;
char *endptr;
NEXT_ARGP();
id = strtoul(**argv, &endptr, 0);
if (*endptr) {
err("can't parse %s as ID\n", **argv);
return -1;
}
NEXT_ARGP();
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0)
err("get by id (%u): %s\n", id, strerror(errno));
return fd;
} else if (is_prefix(**argv, "tag")) {
unsigned char tag[BPF_TAG_SIZE];
NEXT_ARGP();
if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
!= BPF_TAG_SIZE) {
err("can't parse tag\n");
return -1;
}
NEXT_ARGP();
return prog_fd_by_tag(tag);
} else if (is_prefix(**argv, "pinned")) {
char *path;
NEXT_ARGP();
path = **argv;
NEXT_ARGP();
return open_obj_pinned_any(path, BPF_OBJ_PROG);
}
err("expected 'id', 'tag' or 'pinned', got: '%s'?\n", **argv);
return -1;
}
static void show_prog_maps(int fd, u32 num_maps)
{
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
__u32 map_ids[num_maps];
unsigned int i;
int err;
info.nr_map_ids = num_maps;
info.map_ids = ptr_to_u64(map_ids);
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err || !info.nr_map_ids)
return;
printf(" map_ids ");
for (i = 0; i < info.nr_map_ids; i++)
printf("%u%s", map_ids[i],
i == info.nr_map_ids - 1 ? "" : ",");
}
static int show_prog(int fd)
{
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
char *memlock;
int err;
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
err("can't get prog info: %s\n", strerror(errno));
return -1;
}
printf("%u: ", info.id);
if (info.type < ARRAY_SIZE(prog_type_name))
printf("%s ", prog_type_name[info.type]);
else
printf("type %u ", info.type);
if (*info.name)
printf("name %s ", info.name);
printf("tag ");
print_hex(info.tag, BPF_TAG_SIZE, ":");
printf("\n");
if (info.load_time) {
char buf[32];
print_boot_time(info.load_time, buf, sizeof(buf));
/* Piggy back on load_time, since 0 uid is a valid one */
printf("\tloaded_at %s uid %u\n", buf, info.created_by_uid);
}
printf("\txlated %uB", info.xlated_prog_len);
if (info.jited_prog_len)
printf(" jited %uB", info.jited_prog_len);
else
printf(" not jited");
memlock = get_fdinfo(fd, "memlock");
if (memlock)
printf(" memlock %sB", memlock);
free(memlock);
if (info.nr_map_ids)
show_prog_maps(fd, info.nr_map_ids);
printf("\n");
return 0;
}
static int do_show(int argc, char **argv)
{ __u32 id = 0;
int err;
int fd;
if (argc == 2) {
fd = prog_parse_fd(&argc, &argv);
if (fd < 0)
return -1;
return show_prog(fd);
}
if (argc)
return BAD_ARG();
while (true) {
err = bpf_prog_get_next_id(id, &id);
if (err) {
if (errno == ENOENT)
break;
err("can't get next program: %s\n", strerror(errno));
if (errno == EINVAL)
err("kernel too old?\n");
return -1;
}
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0) {
err("can't get prog by id (%u): %s\n",
id, strerror(errno));
return -1;
}
err = show_prog(fd);
close(fd);
if (err)
return err;
}
return 0;
}
static int do_dump(int argc, char **argv)
{
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
bool can_disasm = false;
unsigned int buf_size;
char *filepath = NULL;
bool opcodes = false;
unsigned char *buf;
__u32 *member_len;
__u64 *member_ptr;
ssize_t n;
int err;
int fd;
if (is_prefix(*argv, "jited")) {
member_len = &info.jited_prog_len;
member_ptr = &info.jited_prog_insns;
can_disasm = true;
} else if (is_prefix(*argv, "xlated")) {
member_len = &info.xlated_prog_len;
member_ptr = &info.xlated_prog_insns;
} else {
err("expected 'xlated' or 'jited', got: %s\n", *argv);
return -1;
}
NEXT_ARG();
if (argc < 2)
usage();
fd = prog_parse_fd(&argc, &argv);
if (fd < 0)
return -1;
if (is_prefix(*argv, "file")) {
NEXT_ARG();
if (!argc) {
err("expected file path\n");
return -1;
}
filepath = *argv;
NEXT_ARG();
} else if (is_prefix(*argv, "opcodes")) {
opcodes = true;
NEXT_ARG();
}
if (!filepath && !can_disasm) {
err("expected 'file' got %s\n", *argv);
return -1;
}
if (argc) {
usage();
return -1;
}
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
err("can't get prog info: %s\n", strerror(errno));
return -1;
}
if (!*member_len) {
info("no instructions returned\n");
close(fd);
return 0;
}
buf_size = *member_len;
buf = malloc(buf_size);
if (!buf) {
err("mem alloc failed\n");
close(fd);
return -1;
}
memset(&info, 0, sizeof(info));
*member_ptr = ptr_to_u64(buf);
*member_len = buf_size;
err = bpf_obj_get_info_by_fd(fd, &info, &len);
close(fd);
if (err) {
err("can't get prog info: %s\n", strerror(errno));
goto err_free;
}
if (*member_len > buf_size) {
info("too many instructions returned\n");
goto err_free;
}
if (filepath) {
fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fd < 0) {
err("can't open file %s: %s\n", filepath,
strerror(errno));
goto err_free;
}
n = write(fd, buf, *member_len);
close(fd);
if (n != *member_len) {
err("error writing output file: %s\n",
n < 0 ? strerror(errno) : "short write");
goto err_free;
}
} else {
disasm_print_insn(buf, *member_len, opcodes);
}
free(buf);
return 0;
err_free:
free(buf);
return -1;
}
static int do_pin(int argc, char **argv)
{
return do_pin_any(argc, argv, bpf_prog_get_fd_by_id);
}
static int do_help(int argc, char **argv)
{
fprintf(stderr,
"Usage: %s %s show [PROG]\n"
" %s %s dump xlated PROG file FILE\n"
" %s %s dump jited PROG [file FILE] [opcodes]\n"
" %s %s pin PROG FILE\n"
" %s %s help\n"
"\n"
" " HELP_SPEC_PROGRAM "\n"
"",
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2]);
return 0;
}
static const struct cmd cmds[] = {
{ "show", do_show },
{ "dump", do_dump },
{ "pin", do_pin },
{ 0 }
};
int do_prog(int argc, char **argv)
{
return cmd_select(cmds, argc, argv, do_help);
}