mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 23:25:37 +07:00
86edaed379
Commitc3494801cd
("bpf: check pending signals while verifying programs") makes it possible for the BPF_PROG_LOAD to fail with EAGAIN. Retry unconditionally in this case. Fixes:c3494801cd
("bpf: check pending signals while verifying programs") Signed-off-by: Lorenz Bauer <lmb@cloudflare.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
666 lines
16 KiB
C
666 lines
16 KiB
C
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
|
|
|
|
/*
|
|
* common eBPF ELF operations.
|
|
*
|
|
* Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
|
|
* Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
|
|
* Copyright (C) 2015 Huawei Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation;
|
|
* version 2.1 of the License (not later!)
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this program; if not, see <http://www.gnu.org/licenses>
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <memory.h>
|
|
#include <unistd.h>
|
|
#include <asm/unistd.h>
|
|
#include <linux/bpf.h>
|
|
#include "bpf.h"
|
|
#include "libbpf.h"
|
|
#include <errno.h>
|
|
|
|
/*
|
|
* When building perf, unistd.h is overridden. __NR_bpf is
|
|
* required to be defined explicitly.
|
|
*/
|
|
#ifndef __NR_bpf
|
|
# if defined(__i386__)
|
|
# define __NR_bpf 357
|
|
# elif defined(__x86_64__)
|
|
# define __NR_bpf 321
|
|
# elif defined(__aarch64__)
|
|
# define __NR_bpf 280
|
|
# elif defined(__sparc__)
|
|
# define __NR_bpf 349
|
|
# elif defined(__s390__)
|
|
# define __NR_bpf 351
|
|
# else
|
|
# error __NR_bpf not defined. libbpf does not support your arch.
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef min
|
|
#define min(x, y) ((x) < (y) ? (x) : (y))
|
|
#endif
|
|
|
|
static inline __u64 ptr_to_u64(const void *ptr)
|
|
{
|
|
return (__u64) (unsigned long) ptr;
|
|
}
|
|
|
|
static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
|
|
unsigned int size)
|
|
{
|
|
return syscall(__NR_bpf, cmd, attr, size);
|
|
}
|
|
|
|
static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
|
|
{
|
|
int fd;
|
|
|
|
do {
|
|
fd = sys_bpf(BPF_PROG_LOAD, attr, size);
|
|
} while (fd < 0 && errno == EAGAIN);
|
|
|
|
return fd;
|
|
}
|
|
|
|
int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
|
|
{
|
|
__u32 name_len = create_attr->name ? strlen(create_attr->name) : 0;
|
|
union bpf_attr attr;
|
|
|
|
memset(&attr, '\0', sizeof(attr));
|
|
|
|
attr.map_type = create_attr->map_type;
|
|
attr.key_size = create_attr->key_size;
|
|
attr.value_size = create_attr->value_size;
|
|
attr.max_entries = create_attr->max_entries;
|
|
attr.map_flags = create_attr->map_flags;
|
|
memcpy(attr.map_name, create_attr->name,
|
|
min(name_len, BPF_OBJ_NAME_LEN - 1));
|
|
attr.numa_node = create_attr->numa_node;
|
|
attr.btf_fd = create_attr->btf_fd;
|
|
attr.btf_key_type_id = create_attr->btf_key_type_id;
|
|
attr.btf_value_type_id = create_attr->btf_value_type_id;
|
|
attr.map_ifindex = create_attr->map_ifindex;
|
|
attr.inner_map_fd = create_attr->inner_map_fd;
|
|
|
|
return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
|
|
int key_size, int value_size, int max_entries,
|
|
__u32 map_flags, int node)
|
|
{
|
|
struct bpf_create_map_attr map_attr = {};
|
|
|
|
map_attr.name = name;
|
|
map_attr.map_type = map_type;
|
|
map_attr.map_flags = map_flags;
|
|
map_attr.key_size = key_size;
|
|
map_attr.value_size = value_size;
|
|
map_attr.max_entries = max_entries;
|
|
if (node >= 0) {
|
|
map_attr.numa_node = node;
|
|
map_attr.map_flags |= BPF_F_NUMA_NODE;
|
|
}
|
|
|
|
return bpf_create_map_xattr(&map_attr);
|
|
}
|
|
|
|
int bpf_create_map(enum bpf_map_type map_type, int key_size,
|
|
int value_size, int max_entries, __u32 map_flags)
|
|
{
|
|
struct bpf_create_map_attr map_attr = {};
|
|
|
|
map_attr.map_type = map_type;
|
|
map_attr.map_flags = map_flags;
|
|
map_attr.key_size = key_size;
|
|
map_attr.value_size = value_size;
|
|
map_attr.max_entries = max_entries;
|
|
|
|
return bpf_create_map_xattr(&map_attr);
|
|
}
|
|
|
|
int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
|
|
int key_size, int value_size, int max_entries,
|
|
__u32 map_flags)
|
|
{
|
|
struct bpf_create_map_attr map_attr = {};
|
|
|
|
map_attr.name = name;
|
|
map_attr.map_type = map_type;
|
|
map_attr.map_flags = map_flags;
|
|
map_attr.key_size = key_size;
|
|
map_attr.value_size = value_size;
|
|
map_attr.max_entries = max_entries;
|
|
|
|
return bpf_create_map_xattr(&map_attr);
|
|
}
|
|
|
|
int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
|
|
int key_size, int inner_map_fd, int max_entries,
|
|
__u32 map_flags, int node)
|
|
{
|
|
__u32 name_len = name ? strlen(name) : 0;
|
|
union bpf_attr attr;
|
|
|
|
memset(&attr, '\0', sizeof(attr));
|
|
|
|
attr.map_type = map_type;
|
|
attr.key_size = key_size;
|
|
attr.value_size = 4;
|
|
attr.inner_map_fd = inner_map_fd;
|
|
attr.max_entries = max_entries;
|
|
attr.map_flags = map_flags;
|
|
memcpy(attr.map_name, name, min(name_len, BPF_OBJ_NAME_LEN - 1));
|
|
|
|
if (node >= 0) {
|
|
attr.map_flags |= BPF_F_NUMA_NODE;
|
|
attr.numa_node = node;
|
|
}
|
|
|
|
return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name,
|
|
int key_size, int inner_map_fd, int max_entries,
|
|
__u32 map_flags)
|
|
{
|
|
return bpf_create_map_in_map_node(map_type, name, key_size,
|
|
inner_map_fd, max_entries, map_flags,
|
|
-1);
|
|
}
|
|
|
|
static void *
|
|
alloc_zero_tailing_info(const void *orecord, __u32 cnt,
|
|
__u32 actual_rec_size, __u32 expected_rec_size)
|
|
{
|
|
__u64 info_len = actual_rec_size * cnt;
|
|
void *info, *nrecord;
|
|
int i;
|
|
|
|
info = malloc(info_len);
|
|
if (!info)
|
|
return NULL;
|
|
|
|
/* zero out bytes kernel does not understand */
|
|
nrecord = info;
|
|
for (i = 0; i < cnt; i++) {
|
|
memcpy(nrecord, orecord, expected_rec_size);
|
|
memset(nrecord + expected_rec_size, 0,
|
|
actual_rec_size - expected_rec_size);
|
|
orecord += actual_rec_size;
|
|
nrecord += actual_rec_size;
|
|
}
|
|
|
|
return info;
|
|
}
|
|
|
|
int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
|
|
char *log_buf, size_t log_buf_sz)
|
|
{
|
|
void *finfo = NULL, *linfo = NULL;
|
|
union bpf_attr attr;
|
|
__u32 name_len;
|
|
int fd;
|
|
|
|
if (!load_attr)
|
|
return -EINVAL;
|
|
|
|
name_len = load_attr->name ? strlen(load_attr->name) : 0;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.prog_type = load_attr->prog_type;
|
|
attr.expected_attach_type = load_attr->expected_attach_type;
|
|
attr.insn_cnt = (__u32)load_attr->insns_cnt;
|
|
attr.insns = ptr_to_u64(load_attr->insns);
|
|
attr.license = ptr_to_u64(load_attr->license);
|
|
attr.log_buf = ptr_to_u64(NULL);
|
|
attr.log_size = 0;
|
|
attr.log_level = 0;
|
|
attr.kern_version = load_attr->kern_version;
|
|
attr.prog_ifindex = load_attr->prog_ifindex;
|
|
attr.prog_btf_fd = load_attr->prog_btf_fd;
|
|
attr.func_info_rec_size = load_attr->func_info_rec_size;
|
|
attr.func_info_cnt = load_attr->func_info_cnt;
|
|
attr.func_info = ptr_to_u64(load_attr->func_info);
|
|
attr.line_info_rec_size = load_attr->line_info_rec_size;
|
|
attr.line_info_cnt = load_attr->line_info_cnt;
|
|
attr.line_info = ptr_to_u64(load_attr->line_info);
|
|
memcpy(attr.prog_name, load_attr->name,
|
|
min(name_len, BPF_OBJ_NAME_LEN - 1));
|
|
|
|
fd = sys_bpf_prog_load(&attr, sizeof(attr));
|
|
if (fd >= 0)
|
|
return fd;
|
|
|
|
/* After bpf_prog_load, the kernel may modify certain attributes
|
|
* to give user space a hint how to deal with loading failure.
|
|
* Check to see whether we can make some changes and load again.
|
|
*/
|
|
while (errno == E2BIG && (!finfo || !linfo)) {
|
|
if (!finfo && attr.func_info_cnt &&
|
|
attr.func_info_rec_size < load_attr->func_info_rec_size) {
|
|
/* try with corrected func info records */
|
|
finfo = alloc_zero_tailing_info(load_attr->func_info,
|
|
load_attr->func_info_cnt,
|
|
load_attr->func_info_rec_size,
|
|
attr.func_info_rec_size);
|
|
if (!finfo)
|
|
goto done;
|
|
|
|
attr.func_info = ptr_to_u64(finfo);
|
|
attr.func_info_rec_size = load_attr->func_info_rec_size;
|
|
} else if (!linfo && attr.line_info_cnt &&
|
|
attr.line_info_rec_size <
|
|
load_attr->line_info_rec_size) {
|
|
linfo = alloc_zero_tailing_info(load_attr->line_info,
|
|
load_attr->line_info_cnt,
|
|
load_attr->line_info_rec_size,
|
|
attr.line_info_rec_size);
|
|
if (!linfo)
|
|
goto done;
|
|
|
|
attr.line_info = ptr_to_u64(linfo);
|
|
attr.line_info_rec_size = load_attr->line_info_rec_size;
|
|
} else {
|
|
break;
|
|
}
|
|
|
|
fd = sys_bpf_prog_load(&attr, sizeof(attr));
|
|
|
|
if (fd >= 0)
|
|
goto done;
|
|
}
|
|
|
|
if (!log_buf || !log_buf_sz)
|
|
goto done;
|
|
|
|
/* Try again with log */
|
|
attr.log_buf = ptr_to_u64(log_buf);
|
|
attr.log_size = log_buf_sz;
|
|
attr.log_level = 1;
|
|
log_buf[0] = 0;
|
|
fd = sys_bpf_prog_load(&attr, sizeof(attr));
|
|
done:
|
|
free(finfo);
|
|
free(linfo);
|
|
return fd;
|
|
}
|
|
|
|
int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
|
|
size_t insns_cnt, const char *license,
|
|
__u32 kern_version, char *log_buf,
|
|
size_t log_buf_sz)
|
|
{
|
|
struct bpf_load_program_attr load_attr;
|
|
|
|
memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
|
|
load_attr.prog_type = type;
|
|
load_attr.expected_attach_type = 0;
|
|
load_attr.name = NULL;
|
|
load_attr.insns = insns;
|
|
load_attr.insns_cnt = insns_cnt;
|
|
load_attr.license = license;
|
|
load_attr.kern_version = kern_version;
|
|
|
|
return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
|
|
}
|
|
|
|
int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
|
|
size_t insns_cnt, __u32 prog_flags, const char *license,
|
|
__u32 kern_version, char *log_buf, size_t log_buf_sz,
|
|
int log_level)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.prog_type = type;
|
|
attr.insn_cnt = (__u32)insns_cnt;
|
|
attr.insns = ptr_to_u64(insns);
|
|
attr.license = ptr_to_u64(license);
|
|
attr.log_buf = ptr_to_u64(log_buf);
|
|
attr.log_size = log_buf_sz;
|
|
attr.log_level = log_level;
|
|
log_buf[0] = 0;
|
|
attr.kern_version = kern_version;
|
|
attr.prog_flags = prog_flags;
|
|
|
|
return sys_bpf_prog_load(&attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_map_update_elem(int fd, const void *key, const void *value,
|
|
__u64 flags)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
attr.value = ptr_to_u64(value);
|
|
attr.flags = flags;
|
|
|
|
return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_map_lookup_elem(int fd, const void *key, void *value)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
attr.value = ptr_to_u64(value);
|
|
|
|
return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
attr.value = ptr_to_u64(value);
|
|
|
|
return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_map_delete_elem(int fd, const void *key)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
|
|
return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_map_get_next_key(int fd, const void *key, void *next_key)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
attr.next_key = ptr_to_u64(next_key);
|
|
|
|
return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_obj_pin(int fd, const char *pathname)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.pathname = ptr_to_u64((void *)pathname);
|
|
attr.bpf_fd = fd;
|
|
|
|
return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_obj_get(const char *pathname)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.pathname = ptr_to_u64((void *)pathname);
|
|
|
|
return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
|
|
unsigned int flags)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.target_fd = target_fd;
|
|
attr.attach_bpf_fd = prog_fd;
|
|
attr.attach_type = type;
|
|
attr.attach_flags = flags;
|
|
|
|
return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.target_fd = target_fd;
|
|
attr.attach_type = type;
|
|
|
|
return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.target_fd = target_fd;
|
|
attr.attach_bpf_fd = prog_fd;
|
|
attr.attach_type = type;
|
|
|
|
return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
|
|
__u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.query.target_fd = target_fd;
|
|
attr.query.attach_type = type;
|
|
attr.query.query_flags = query_flags;
|
|
attr.query.prog_cnt = *prog_cnt;
|
|
attr.query.prog_ids = ptr_to_u64(prog_ids);
|
|
|
|
ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));
|
|
if (attach_flags)
|
|
*attach_flags = attr.query.attach_flags;
|
|
*prog_cnt = attr.query.prog_cnt;
|
|
return ret;
|
|
}
|
|
|
|
int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
|
|
void *data_out, __u32 *size_out, __u32 *retval,
|
|
__u32 *duration)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.test.prog_fd = prog_fd;
|
|
attr.test.data_in = ptr_to_u64(data);
|
|
attr.test.data_out = ptr_to_u64(data_out);
|
|
attr.test.data_size_in = size;
|
|
attr.test.repeat = repeat;
|
|
|
|
ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
|
|
if (size_out)
|
|
*size_out = attr.test.data_size_out;
|
|
if (retval)
|
|
*retval = attr.test.retval;
|
|
if (duration)
|
|
*duration = attr.test.duration;
|
|
return ret;
|
|
}
|
|
|
|
int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
if (!test_attr->data_out && test_attr->data_size_out > 0)
|
|
return -EINVAL;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.test.prog_fd = test_attr->prog_fd;
|
|
attr.test.data_in = ptr_to_u64(test_attr->data_in);
|
|
attr.test.data_out = ptr_to_u64(test_attr->data_out);
|
|
attr.test.data_size_in = test_attr->data_size_in;
|
|
attr.test.data_size_out = test_attr->data_size_out;
|
|
attr.test.repeat = test_attr->repeat;
|
|
|
|
ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
|
|
test_attr->data_size_out = attr.test.data_size_out;
|
|
test_attr->retval = attr.test.retval;
|
|
test_attr->duration = attr.test.duration;
|
|
return ret;
|
|
}
|
|
|
|
int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
|
|
{
|
|
union bpf_attr attr;
|
|
int err;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.start_id = start_id;
|
|
|
|
err = sys_bpf(BPF_PROG_GET_NEXT_ID, &attr, sizeof(attr));
|
|
if (!err)
|
|
*next_id = attr.next_id;
|
|
|
|
return err;
|
|
}
|
|
|
|
int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
|
|
{
|
|
union bpf_attr attr;
|
|
int err;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.start_id = start_id;
|
|
|
|
err = sys_bpf(BPF_MAP_GET_NEXT_ID, &attr, sizeof(attr));
|
|
if (!err)
|
|
*next_id = attr.next_id;
|
|
|
|
return err;
|
|
}
|
|
|
|
int bpf_prog_get_fd_by_id(__u32 id)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.prog_id = id;
|
|
|
|
return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_map_get_fd_by_id(__u32 id)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.map_id = id;
|
|
|
|
return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_btf_get_fd_by_id(__u32 id)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.btf_id = id;
|
|
|
|
return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len)
|
|
{
|
|
union bpf_attr attr;
|
|
int err;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.info.bpf_fd = prog_fd;
|
|
attr.info.info_len = *info_len;
|
|
attr.info.info = ptr_to_u64(info);
|
|
|
|
err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
|
|
if (!err)
|
|
*info_len = attr.info.info_len;
|
|
|
|
return err;
|
|
}
|
|
|
|
int bpf_raw_tracepoint_open(const char *name, int prog_fd)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
bzero(&attr, sizeof(attr));
|
|
attr.raw_tracepoint.name = ptr_to_u64(name);
|
|
attr.raw_tracepoint.prog_fd = prog_fd;
|
|
|
|
return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
|
|
bool do_log)
|
|
{
|
|
union bpf_attr attr = {};
|
|
int fd;
|
|
|
|
attr.btf = ptr_to_u64(btf);
|
|
attr.btf_size = btf_size;
|
|
|
|
retry:
|
|
if (do_log && log_buf && log_buf_size) {
|
|
attr.btf_log_level = 1;
|
|
attr.btf_log_size = log_buf_size;
|
|
attr.btf_log_buf = ptr_to_u64(log_buf);
|
|
}
|
|
|
|
fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
|
|
if (fd == -1 && !do_log && log_buf && log_buf_size) {
|
|
do_log = true;
|
|
goto retry;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len,
|
|
__u32 *prog_id, __u32 *fd_type, __u64 *probe_offset,
|
|
__u64 *probe_addr)
|
|
{
|
|
union bpf_attr attr = {};
|
|
int err;
|
|
|
|
attr.task_fd_query.pid = pid;
|
|
attr.task_fd_query.fd = fd;
|
|
attr.task_fd_query.flags = flags;
|
|
attr.task_fd_query.buf = ptr_to_u64(buf);
|
|
attr.task_fd_query.buf_len = *buf_len;
|
|
|
|
err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr));
|
|
*buf_len = attr.task_fd_query.buf_len;
|
|
*prog_id = attr.task_fd_query.prog_id;
|
|
*fd_type = attr.task_fd_query.fd_type;
|
|
*probe_offset = attr.task_fd_query.probe_offset;
|
|
*probe_addr = attr.task_fd_query.probe_addr;
|
|
|
|
return err;
|
|
}
|