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9dbe601563
This patch adds libbpf support for kernel module function call support. The fd_array parameter is used during BPF program load to pass module BTFs referenced by the program. insn->off is set to index into this array, but starts from 1, because insn->off as 0 is reserved for btf_vmlinux. We try to use existing insn->off for a module, since the kernel limits the maximum distinct module BTFs for kfuncs to 256, and also because index must never exceed the maximum allowed value that can fit in insn->off (INT16_MAX). In the future, if kernel interprets signed offset as unsigned for kfunc calls, this limit can be increased to UINT16_MAX. Also introduce a btf__find_by_name_kind_own helper to start searching from module BTF's start id when we know that the BTF ID is not present in vmlinux BTF (in find_ksym_btf_id). Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211002011757.311265-7-memxor@gmail.com
1074 lines
27 KiB
C
1074 lines
27 KiB
C
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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/*
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* common eBPF ELF operations.
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*
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* Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
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* Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2015 Huawei Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License (not later!)
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses>
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <memory.h>
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#include <unistd.h>
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#include <asm/unistd.h>
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#include <errno.h>
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#include <linux/bpf.h>
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#include "bpf.h"
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#include "libbpf.h"
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#include "libbpf_internal.h"
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/*
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* When building perf, unistd.h is overridden. __NR_bpf is
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* required to be defined explicitly.
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*/
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#ifndef __NR_bpf
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# if defined(__i386__)
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# define __NR_bpf 357
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# elif defined(__x86_64__)
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# define __NR_bpf 321
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# elif defined(__aarch64__)
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# define __NR_bpf 280
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# elif defined(__sparc__)
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# define __NR_bpf 349
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# elif defined(__s390__)
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# define __NR_bpf 351
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# elif defined(__arc__)
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# define __NR_bpf 280
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# else
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# error __NR_bpf not defined. libbpf does not support your arch.
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# endif
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#endif
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static inline __u64 ptr_to_u64(const void *ptr)
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{
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return (__u64) (unsigned long) ptr;
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}
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static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
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unsigned int size)
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{
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return syscall(__NR_bpf, cmd, attr, size);
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}
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static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
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{
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int retries = 5;
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int fd;
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do {
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fd = sys_bpf(BPF_PROG_LOAD, attr, size);
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} while (fd < 0 && errno == EAGAIN && retries-- > 0);
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return fd;
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}
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int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
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{
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union bpf_attr attr;
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int fd;
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memset(&attr, '\0', sizeof(attr));
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attr.map_type = create_attr->map_type;
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attr.key_size = create_attr->key_size;
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attr.value_size = create_attr->value_size;
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attr.max_entries = create_attr->max_entries;
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attr.map_flags = create_attr->map_flags;
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if (create_attr->name)
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memcpy(attr.map_name, create_attr->name,
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min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1));
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attr.numa_node = create_attr->numa_node;
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attr.btf_fd = create_attr->btf_fd;
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attr.btf_key_type_id = create_attr->btf_key_type_id;
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attr.btf_value_type_id = create_attr->btf_value_type_id;
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attr.map_ifindex = create_attr->map_ifindex;
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if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS)
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attr.btf_vmlinux_value_type_id =
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create_attr->btf_vmlinux_value_type_id;
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else
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attr.inner_map_fd = create_attr->inner_map_fd;
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fd = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
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return libbpf_err_errno(fd);
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}
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int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
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int key_size, int value_size, int max_entries,
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__u32 map_flags, int node)
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{
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struct bpf_create_map_attr map_attr = {};
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map_attr.name = name;
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map_attr.map_type = map_type;
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map_attr.map_flags = map_flags;
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map_attr.key_size = key_size;
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map_attr.value_size = value_size;
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map_attr.max_entries = max_entries;
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if (node >= 0) {
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map_attr.numa_node = node;
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map_attr.map_flags |= BPF_F_NUMA_NODE;
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}
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return bpf_create_map_xattr(&map_attr);
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}
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int bpf_create_map(enum bpf_map_type map_type, int key_size,
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int value_size, int max_entries, __u32 map_flags)
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{
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struct bpf_create_map_attr map_attr = {};
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map_attr.map_type = map_type;
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map_attr.map_flags = map_flags;
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map_attr.key_size = key_size;
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map_attr.value_size = value_size;
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map_attr.max_entries = max_entries;
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return bpf_create_map_xattr(&map_attr);
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}
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int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
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int key_size, int value_size, int max_entries,
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__u32 map_flags)
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{
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struct bpf_create_map_attr map_attr = {};
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map_attr.name = name;
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map_attr.map_type = map_type;
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map_attr.map_flags = map_flags;
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map_attr.key_size = key_size;
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map_attr.value_size = value_size;
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map_attr.max_entries = max_entries;
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return bpf_create_map_xattr(&map_attr);
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}
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int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
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int key_size, int inner_map_fd, int max_entries,
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__u32 map_flags, int node)
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{
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union bpf_attr attr;
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int fd;
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memset(&attr, '\0', sizeof(attr));
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attr.map_type = map_type;
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attr.key_size = key_size;
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attr.value_size = 4;
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attr.inner_map_fd = inner_map_fd;
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attr.max_entries = max_entries;
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attr.map_flags = map_flags;
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if (name)
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memcpy(attr.map_name, name,
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min(strlen(name), BPF_OBJ_NAME_LEN - 1));
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if (node >= 0) {
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attr.map_flags |= BPF_F_NUMA_NODE;
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attr.numa_node = node;
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}
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fd = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
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return libbpf_err_errno(fd);
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}
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int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name,
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int key_size, int inner_map_fd, int max_entries,
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__u32 map_flags)
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{
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return bpf_create_map_in_map_node(map_type, name, key_size,
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inner_map_fd, max_entries, map_flags,
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-1);
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}
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static void *
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alloc_zero_tailing_info(const void *orecord, __u32 cnt,
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__u32 actual_rec_size, __u32 expected_rec_size)
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{
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__u64 info_len = (__u64)actual_rec_size * cnt;
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void *info, *nrecord;
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int i;
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info = malloc(info_len);
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if (!info)
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return NULL;
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/* zero out bytes kernel does not understand */
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nrecord = info;
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for (i = 0; i < cnt; i++) {
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memcpy(nrecord, orecord, expected_rec_size);
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memset(nrecord + expected_rec_size, 0,
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actual_rec_size - expected_rec_size);
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orecord += actual_rec_size;
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nrecord += actual_rec_size;
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}
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return info;
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}
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int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr)
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{
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void *finfo = NULL, *linfo = NULL;
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union bpf_attr attr;
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int fd;
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if (!load_attr->log_buf != !load_attr->log_buf_sz)
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return libbpf_err(-EINVAL);
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if (load_attr->log_level > (4 | 2 | 1) || (load_attr->log_level && !load_attr->log_buf))
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return libbpf_err(-EINVAL);
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memset(&attr, 0, sizeof(attr));
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attr.prog_type = load_attr->prog_type;
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attr.expected_attach_type = load_attr->expected_attach_type;
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if (load_attr->attach_prog_fd)
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attr.attach_prog_fd = load_attr->attach_prog_fd;
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else
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attr.attach_btf_obj_fd = load_attr->attach_btf_obj_fd;
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attr.attach_btf_id = load_attr->attach_btf_id;
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attr.prog_ifindex = load_attr->prog_ifindex;
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attr.kern_version = load_attr->kern_version;
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attr.insn_cnt = (__u32)load_attr->insn_cnt;
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attr.insns = ptr_to_u64(load_attr->insns);
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attr.license = ptr_to_u64(load_attr->license);
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attr.log_level = load_attr->log_level;
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if (attr.log_level) {
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attr.log_buf = ptr_to_u64(load_attr->log_buf);
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attr.log_size = load_attr->log_buf_sz;
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}
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attr.prog_btf_fd = load_attr->prog_btf_fd;
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attr.prog_flags = load_attr->prog_flags;
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attr.func_info_rec_size = load_attr->func_info_rec_size;
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attr.func_info_cnt = load_attr->func_info_cnt;
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attr.func_info = ptr_to_u64(load_attr->func_info);
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attr.line_info_rec_size = load_attr->line_info_rec_size;
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attr.line_info_cnt = load_attr->line_info_cnt;
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attr.line_info = ptr_to_u64(load_attr->line_info);
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attr.fd_array = ptr_to_u64(load_attr->fd_array);
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if (load_attr->name)
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memcpy(attr.prog_name, load_attr->name,
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min(strlen(load_attr->name), (size_t)BPF_OBJ_NAME_LEN - 1));
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fd = sys_bpf_prog_load(&attr, sizeof(attr));
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if (fd >= 0)
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return fd;
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/* After bpf_prog_load, the kernel may modify certain attributes
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* to give user space a hint how to deal with loading failure.
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* Check to see whether we can make some changes and load again.
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*/
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while (errno == E2BIG && (!finfo || !linfo)) {
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if (!finfo && attr.func_info_cnt &&
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attr.func_info_rec_size < load_attr->func_info_rec_size) {
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/* try with corrected func info records */
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finfo = alloc_zero_tailing_info(load_attr->func_info,
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load_attr->func_info_cnt,
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load_attr->func_info_rec_size,
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attr.func_info_rec_size);
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if (!finfo) {
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errno = E2BIG;
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goto done;
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}
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attr.func_info = ptr_to_u64(finfo);
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attr.func_info_rec_size = load_attr->func_info_rec_size;
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} else if (!linfo && attr.line_info_cnt &&
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attr.line_info_rec_size <
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load_attr->line_info_rec_size) {
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linfo = alloc_zero_tailing_info(load_attr->line_info,
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load_attr->line_info_cnt,
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load_attr->line_info_rec_size,
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attr.line_info_rec_size);
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if (!linfo) {
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errno = E2BIG;
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goto done;
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}
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attr.line_info = ptr_to_u64(linfo);
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attr.line_info_rec_size = load_attr->line_info_rec_size;
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} else {
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break;
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}
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fd = sys_bpf_prog_load(&attr, sizeof(attr));
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if (fd >= 0)
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goto done;
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}
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if (load_attr->log_level || !load_attr->log_buf)
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goto done;
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/* Try again with log */
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attr.log_buf = ptr_to_u64(load_attr->log_buf);
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attr.log_size = load_attr->log_buf_sz;
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attr.log_level = 1;
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load_attr->log_buf[0] = 0;
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fd = sys_bpf_prog_load(&attr, sizeof(attr));
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done:
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/* free() doesn't affect errno, so we don't need to restore it */
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free(finfo);
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free(linfo);
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return libbpf_err_errno(fd);
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}
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int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
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char *log_buf, size_t log_buf_sz)
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{
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struct bpf_prog_load_params p = {};
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if (!load_attr || !log_buf != !log_buf_sz)
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return libbpf_err(-EINVAL);
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p.prog_type = load_attr->prog_type;
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p.expected_attach_type = load_attr->expected_attach_type;
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switch (p.prog_type) {
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case BPF_PROG_TYPE_STRUCT_OPS:
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case BPF_PROG_TYPE_LSM:
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p.attach_btf_id = load_attr->attach_btf_id;
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break;
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case BPF_PROG_TYPE_TRACING:
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case BPF_PROG_TYPE_EXT:
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p.attach_btf_id = load_attr->attach_btf_id;
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p.attach_prog_fd = load_attr->attach_prog_fd;
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break;
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default:
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p.prog_ifindex = load_attr->prog_ifindex;
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p.kern_version = load_attr->kern_version;
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}
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p.insn_cnt = load_attr->insns_cnt;
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p.insns = load_attr->insns;
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p.license = load_attr->license;
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p.log_level = load_attr->log_level;
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p.log_buf = log_buf;
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p.log_buf_sz = log_buf_sz;
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p.prog_btf_fd = load_attr->prog_btf_fd;
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p.func_info_rec_size = load_attr->func_info_rec_size;
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p.func_info_cnt = load_attr->func_info_cnt;
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p.func_info = load_attr->func_info;
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p.line_info_rec_size = load_attr->line_info_rec_size;
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p.line_info_cnt = load_attr->line_info_cnt;
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p.line_info = load_attr->line_info;
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p.name = load_attr->name;
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p.prog_flags = load_attr->prog_flags;
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return libbpf__bpf_prog_load(&p);
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}
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int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
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size_t insns_cnt, const char *license,
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__u32 kern_version, char *log_buf,
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size_t log_buf_sz)
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{
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struct bpf_load_program_attr load_attr;
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memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
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load_attr.prog_type = type;
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load_attr.expected_attach_type = 0;
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load_attr.name = NULL;
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load_attr.insns = insns;
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load_attr.insns_cnt = insns_cnt;
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load_attr.license = license;
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load_attr.kern_version = kern_version;
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return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
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}
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int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
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size_t insns_cnt, __u32 prog_flags, const char *license,
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__u32 kern_version, char *log_buf, size_t log_buf_sz,
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int log_level)
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{
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union bpf_attr attr;
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int fd;
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memset(&attr, 0, sizeof(attr));
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attr.prog_type = type;
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attr.insn_cnt = (__u32)insns_cnt;
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attr.insns = ptr_to_u64(insns);
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attr.license = ptr_to_u64(license);
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attr.log_buf = ptr_to_u64(log_buf);
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attr.log_size = log_buf_sz;
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attr.log_level = log_level;
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log_buf[0] = 0;
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attr.kern_version = kern_version;
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attr.prog_flags = prog_flags;
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fd = sys_bpf_prog_load(&attr, sizeof(attr));
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return libbpf_err_errno(fd);
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}
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int bpf_map_update_elem(int fd, const void *key, const void *value,
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__u64 flags)
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{
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union bpf_attr attr;
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int ret;
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memset(&attr, 0, sizeof(attr));
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attr.map_fd = fd;
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attr.key = ptr_to_u64(key);
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attr.value = ptr_to_u64(value);
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attr.flags = flags;
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ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
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return libbpf_err_errno(ret);
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}
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int bpf_map_lookup_elem(int fd, const void *key, void *value)
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{
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union bpf_attr attr;
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int ret;
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memset(&attr, 0, sizeof(attr));
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attr.map_fd = fd;
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attr.key = ptr_to_u64(key);
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attr.value = ptr_to_u64(value);
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ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
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return libbpf_err_errno(ret);
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}
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int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
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|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
attr.value = ptr_to_u64(value);
|
|
attr.flags = flags;
|
|
|
|
ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
attr.value = ptr_to_u64(value);
|
|
|
|
ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_map_lookup_and_delete_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_AND_DELETE_ELEM, &attr, sizeof(attr));
|
|
}
|
|
|
|
int bpf_map_delete_elem(int fd, const void *key)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
|
|
ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_map_get_next_key(int fd, const void *key, void *next_key)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
attr.key = ptr_to_u64(key);
|
|
attr.next_key = ptr_to_u64(next_key);
|
|
|
|
ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_map_freeze(int fd)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.map_fd = fd;
|
|
|
|
ret = sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
static int bpf_map_batch_common(int cmd, int fd, void *in_batch,
|
|
void *out_batch, void *keys, void *values,
|
|
__u32 *count,
|
|
const struct bpf_map_batch_opts *opts)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
if (!OPTS_VALID(opts, bpf_map_batch_opts))
|
|
return libbpf_err(-EINVAL);
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.batch.map_fd = fd;
|
|
attr.batch.in_batch = ptr_to_u64(in_batch);
|
|
attr.batch.out_batch = ptr_to_u64(out_batch);
|
|
attr.batch.keys = ptr_to_u64(keys);
|
|
attr.batch.values = ptr_to_u64(values);
|
|
attr.batch.count = *count;
|
|
attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0);
|
|
attr.batch.flags = OPTS_GET(opts, flags, 0);
|
|
|
|
ret = sys_bpf(cmd, &attr, sizeof(attr));
|
|
*count = attr.batch.count;
|
|
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_map_delete_batch(int fd, void *keys, __u32 *count,
|
|
const struct bpf_map_batch_opts *opts)
|
|
{
|
|
return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL,
|
|
NULL, keys, NULL, count, opts);
|
|
}
|
|
|
|
int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
|
|
void *values, __u32 *count,
|
|
const struct bpf_map_batch_opts *opts)
|
|
{
|
|
return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch,
|
|
out_batch, keys, values, count, opts);
|
|
}
|
|
|
|
int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
|
|
void *keys, void *values, __u32 *count,
|
|
const struct bpf_map_batch_opts *opts)
|
|
{
|
|
return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH,
|
|
fd, in_batch, out_batch, keys, values,
|
|
count, opts);
|
|
}
|
|
|
|
int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count,
|
|
const struct bpf_map_batch_opts *opts)
|
|
{
|
|
return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL,
|
|
keys, values, count, opts);
|
|
}
|
|
|
|
int bpf_obj_pin(int fd, const char *pathname)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.pathname = ptr_to_u64((void *)pathname);
|
|
attr.bpf_fd = fd;
|
|
|
|
ret = sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_obj_get(const char *pathname)
|
|
{
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.pathname = ptr_to_u64((void *)pathname);
|
|
|
|
fd = sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
|
|
unsigned int flags)
|
|
{
|
|
DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts,
|
|
.flags = flags,
|
|
);
|
|
|
|
return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts);
|
|
}
|
|
|
|
int bpf_prog_attach_xattr(int prog_fd, int target_fd,
|
|
enum bpf_attach_type type,
|
|
const struct bpf_prog_attach_opts *opts)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
if (!OPTS_VALID(opts, bpf_prog_attach_opts))
|
|
return libbpf_err(-EINVAL);
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.target_fd = target_fd;
|
|
attr.attach_bpf_fd = prog_fd;
|
|
attr.attach_type = type;
|
|
attr.attach_flags = OPTS_GET(opts, flags, 0);
|
|
attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0);
|
|
|
|
ret = sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.target_fd = target_fd;
|
|
attr.attach_type = type;
|
|
|
|
ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.target_fd = target_fd;
|
|
attr.attach_bpf_fd = prog_fd;
|
|
attr.attach_type = type;
|
|
|
|
ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_link_create(int prog_fd, int target_fd,
|
|
enum bpf_attach_type attach_type,
|
|
const struct bpf_link_create_opts *opts)
|
|
{
|
|
__u32 target_btf_id, iter_info_len;
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
if (!OPTS_VALID(opts, bpf_link_create_opts))
|
|
return libbpf_err(-EINVAL);
|
|
|
|
iter_info_len = OPTS_GET(opts, iter_info_len, 0);
|
|
target_btf_id = OPTS_GET(opts, target_btf_id, 0);
|
|
|
|
/* validate we don't have unexpected combinations of non-zero fields */
|
|
if (iter_info_len || target_btf_id) {
|
|
if (iter_info_len && target_btf_id)
|
|
return libbpf_err(-EINVAL);
|
|
if (!OPTS_ZEROED(opts, target_btf_id))
|
|
return libbpf_err(-EINVAL);
|
|
}
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.link_create.prog_fd = prog_fd;
|
|
attr.link_create.target_fd = target_fd;
|
|
attr.link_create.attach_type = attach_type;
|
|
attr.link_create.flags = OPTS_GET(opts, flags, 0);
|
|
|
|
if (target_btf_id) {
|
|
attr.link_create.target_btf_id = target_btf_id;
|
|
goto proceed;
|
|
}
|
|
|
|
switch (attach_type) {
|
|
case BPF_TRACE_ITER:
|
|
attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0));
|
|
attr.link_create.iter_info_len = iter_info_len;
|
|
break;
|
|
case BPF_PERF_EVENT:
|
|
attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0);
|
|
if (!OPTS_ZEROED(opts, perf_event))
|
|
return libbpf_err(-EINVAL);
|
|
break;
|
|
default:
|
|
if (!OPTS_ZEROED(opts, flags))
|
|
return libbpf_err(-EINVAL);
|
|
break;
|
|
}
|
|
proceed:
|
|
fd = sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
int bpf_link_detach(int link_fd)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.link_detach.link_fd = link_fd;
|
|
|
|
ret = sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_link_update(int link_fd, int new_prog_fd,
|
|
const struct bpf_link_update_opts *opts)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
if (!OPTS_VALID(opts, bpf_link_update_opts))
|
|
return libbpf_err(-EINVAL);
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.link_update.link_fd = link_fd;
|
|
attr.link_update.new_prog_fd = new_prog_fd;
|
|
attr.link_update.flags = OPTS_GET(opts, flags, 0);
|
|
attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0);
|
|
|
|
ret = sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_iter_create(int link_fd)
|
|
{
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.iter_create.link_fd = link_fd;
|
|
|
|
fd = sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
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 libbpf_err_errno(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 libbpf_err_errno(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 libbpf_err(-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 libbpf_err_errno(ret);
|
|
}
|
|
|
|
int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
if (!OPTS_VALID(opts, bpf_test_run_opts))
|
|
return libbpf_err(-EINVAL);
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.test.prog_fd = prog_fd;
|
|
attr.test.cpu = OPTS_GET(opts, cpu, 0);
|
|
attr.test.flags = OPTS_GET(opts, flags, 0);
|
|
attr.test.repeat = OPTS_GET(opts, repeat, 0);
|
|
attr.test.duration = OPTS_GET(opts, duration, 0);
|
|
attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0);
|
|
attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0);
|
|
attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0);
|
|
attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0);
|
|
attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL));
|
|
attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL));
|
|
attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL));
|
|
attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL));
|
|
|
|
ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
|
|
|
|
OPTS_SET(opts, data_size_out, attr.test.data_size_out);
|
|
OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out);
|
|
OPTS_SET(opts, duration, attr.test.duration);
|
|
OPTS_SET(opts, retval, attr.test.retval);
|
|
|
|
return libbpf_err_errno(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 libbpf_err_errno(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_link_get_next_id(__u32 start_id, __u32 *next_id)
|
|
{
|
|
return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID);
|
|
}
|
|
|
|
int bpf_prog_get_fd_by_id(__u32 id)
|
|
{
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.prog_id = id;
|
|
|
|
fd = sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
int bpf_map_get_fd_by_id(__u32 id)
|
|
{
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.map_id = id;
|
|
|
|
fd = sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
int bpf_btf_get_fd_by_id(__u32 id)
|
|
{
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.btf_id = id;
|
|
|
|
fd = sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
int bpf_link_get_fd_by_id(__u32 id)
|
|
{
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.link_id = id;
|
|
|
|
fd = sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len)
|
|
{
|
|
union bpf_attr attr;
|
|
int err;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.info.bpf_fd = bpf_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 libbpf_err_errno(err);
|
|
}
|
|
|
|
int bpf_raw_tracepoint_open(const char *name, int prog_fd)
|
|
{
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.raw_tracepoint.name = ptr_to_u64(name);
|
|
attr.raw_tracepoint.prog_fd = prog_fd;
|
|
|
|
fd = sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
int bpf_load_btf(const 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 < 0 && !do_log && log_buf && log_buf_size) {
|
|
do_log = true;
|
|
goto retry;
|
|
}
|
|
|
|
return libbpf_err_errno(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 libbpf_err_errno(err);
|
|
}
|
|
|
|
int bpf_enable_stats(enum bpf_stats_type type)
|
|
{
|
|
union bpf_attr attr;
|
|
int fd;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.enable_stats.type = type;
|
|
|
|
fd = sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr));
|
|
return libbpf_err_errno(fd);
|
|
}
|
|
|
|
int bpf_prog_bind_map(int prog_fd, int map_fd,
|
|
const struct bpf_prog_bind_opts *opts)
|
|
{
|
|
union bpf_attr attr;
|
|
int ret;
|
|
|
|
if (!OPTS_VALID(opts, bpf_prog_bind_opts))
|
|
return libbpf_err(-EINVAL);
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.prog_bind_map.prog_fd = prog_fd;
|
|
attr.prog_bind_map.map_fd = map_fd;
|
|
attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0);
|
|
|
|
ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr));
|
|
return libbpf_err_errno(ret);
|
|
}
|