| // 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 <string.h> |
| #include <memory.h> |
| #include <unistd.h> |
| #include <asm/unistd.h> |
| #include <errno.h> |
| #include <linux/bpf.h> |
| #include "bpf.h" |
| #include "libbpf.h" |
| #include "libbpf_internal.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 |
| # elif defined(__arc__) |
| # define __NR_bpf 280 |
| # else |
| # error __NR_bpf not defined. libbpf does not support your arch. |
| # endif |
| #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) |
| { |
| 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; |
| if (create_attr->name) |
| memcpy(attr.map_name, create_attr->name, |
| min(strlen(create_attr->name), 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) |
| { |
| 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; |
| if (name) |
| memcpy(attr.map_name, name, |
| min(strlen(name), 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 = (__u64)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 log_level; |
| int fd; |
| |
| if (!load_attr || !log_buf != !log_buf_sz) |
| return -EINVAL; |
| |
| log_level = load_attr->log_level; |
| if (log_level > (4 | 2 | 1) || (log_level && !log_buf)) |
| return -EINVAL; |
| |
| memset(&attr, 0, 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_level = log_level; |
| if (log_level) { |
| attr.log_buf = ptr_to_u64(log_buf); |
| attr.log_size = log_buf_sz; |
| } else { |
| attr.log_buf = ptr_to_u64(NULL); |
| attr.log_size = 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); |
| if (load_attr->name) |
| memcpy(attr.prog_name, load_attr->name, |
| min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1)); |
| attr.prog_flags = load_attr->prog_flags; |
| |
| 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_level || !log_buf) |
| 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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_elem_flags(int fd, const void *key, void *value, __u64 flags) |
| { |
| union bpf_attr attr; |
| |
| memset(&attr, 0, 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_LOOKUP_ELEM, &attr, sizeof(attr)); |
| } |
| |
| int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) |
| { |
| union bpf_attr attr; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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_map_freeze(int fd) |
| { |
| union bpf_attr attr; |
| |
| memset(&attr, 0, sizeof(attr)); |
| attr.map_fd = fd; |
| |
| return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); |
| } |
| |
| int bpf_obj_pin(int fd, const char *pathname) |
| { |
| union bpf_attr attr; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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.ctx_in = ptr_to_u64(test_attr->ctx_in); |
| attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); |
| attr.test.ctx_size_in = test_attr->ctx_size_in; |
| attr.test.ctx_size_out = test_attr->ctx_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->ctx_size_out = attr.test.ctx_size_out; |
| test_attr->retval = attr.test.retval; |
| test_attr->duration = attr.test.duration; |
| return ret; |
| } |
| |
| static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) |
| { |
| union bpf_attr attr; |
| int err; |
| |
| memset(&attr, 0, sizeof(attr)); |
| attr.start_id = start_id; |
| |
| err = sys_bpf(cmd, &attr, sizeof(attr)); |
| if (!err) |
| *next_id = attr.next_id; |
| |
| return err; |
| } |
| |
| int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) |
| { |
| return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); |
| } |
| |
| int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) |
| { |
| return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); |
| } |
| |
| int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) |
| { |
| return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); |
| } |
| |
| int bpf_prog_get_fd_by_id(__u32 id) |
| { |
| union bpf_attr attr; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| |
| memset(&attr, 0, 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; |
| } |