2018-01-30 20:55:03 +00:00
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// SPDX-License-Identifier: LGPL-2.1
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2015-07-01 02:14:03 +00:00
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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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2016-07-04 11:02:42 +00:00
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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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2015-07-01 02:14:03 +00:00
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*/
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#include <stdlib.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 <linux/bpf.h>
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#include "bpf.h"
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2018-01-30 20:55:01 +00:00
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#include "libbpf.h"
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#include "nlattr.h"
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#include <linux/rtnetlink.h>
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#include <linux/if_link.h>
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#include <sys/socket.h>
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#include <errno.h>
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2015-07-01 02:14:03 +00:00
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2018-01-30 20:55:02 +00:00
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#ifndef SOL_NETLINK
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#define SOL_NETLINK 270
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#endif
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2015-07-01 02:14:03 +00:00
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/*
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2017-02-27 22:29:28 +00:00
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* When building perf, unistd.h is overridden. __NR_bpf is
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2016-01-11 13:47:57 +00:00
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* required to be defined explicitly.
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2015-07-01 02:14:03 +00:00
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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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2017-04-22 19:31:05 +00:00
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# elif defined(__sparc__)
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# define __NR_bpf 349
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2017-08-04 12:20:55 +00:00
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# elif defined(__s390__)
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# define __NR_bpf 351
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2015-07-01 02:14:03 +00:00
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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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2018-01-30 20:55:01 +00:00
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#ifndef min
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2017-09-27 21:37:54 +00:00
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#define min(x, y) ((x) < (y) ? (x) : (y))
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2018-01-30 20:55:01 +00:00
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#endif
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2017-09-27 21:37:54 +00:00
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2017-02-11 19:37:08 +00:00
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static inline __u64 ptr_to_u64(const void *ptr)
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2015-07-01 02:14:06 +00:00
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{
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return (__u64) (unsigned long) ptr;
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}
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2017-02-11 19:37:08 +00:00
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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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2015-07-01 02:14:03 +00:00
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{
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return syscall(__NR_bpf, cmd, attr, size);
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}
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2017-09-27 21:37:54 +00:00
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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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2015-07-01 02:14:03 +00:00
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{
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2017-09-27 21:37:54 +00:00
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__u32 name_len = name ? strlen(name) : 0;
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2015-07-01 02:14:03 +00:00
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union bpf_attr attr;
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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 = value_size;
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attr.max_entries = max_entries;
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2016-12-09 02:46:16 +00:00
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attr.map_flags = map_flags;
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2017-09-27 21:37:54 +00:00
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memcpy(attr.map_name, name, min(name_len, BPF_OBJ_NAME_LEN - 1));
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2017-08-18 18:28:01 +00:00
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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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2015-07-01 02:14:03 +00:00
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return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
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}
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2015-07-01 02:14:06 +00:00
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2017-08-18 18:28:01 +00:00
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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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2017-09-27 21:37:54 +00:00
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return bpf_create_map_node(map_type, NULL, key_size, value_size,
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2017-08-18 18:28:01 +00:00
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max_entries, map_flags, -1);
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}
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2017-09-27 21:37:54 +00:00
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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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return bpf_create_map_node(map_type, name, key_size, value_size,
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max_entries, map_flags, -1);
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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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2017-08-18 18:28:01 +00:00
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__u32 map_flags, int node)
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2017-03-22 17:00:35 +00:00
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{
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2017-09-27 21:37:54 +00:00
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__u32 name_len = name ? strlen(name) : 0;
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2017-03-22 17:00:35 +00:00
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union bpf_attr attr;
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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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2017-09-27 21:37:54 +00:00
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memcpy(attr.map_name, name, min(name_len, BPF_OBJ_NAME_LEN - 1));
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2017-08-18 18:28:01 +00:00
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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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2017-03-22 17:00:35 +00:00
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return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
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}
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2017-09-27 21:37:54 +00:00
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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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2017-08-18 18:28:01 +00:00
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{
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2017-09-27 21:37:54 +00:00
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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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2017-08-18 18:28:01 +00:00
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}
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2018-03-30 22:08:01 +00:00
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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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2015-07-01 02:14:06 +00:00
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{
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union bpf_attr attr;
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2018-03-30 22:08:01 +00:00
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__u32 name_len;
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int fd;
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if (!load_attr)
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return -EINVAL;
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name_len = load_attr->name ? strlen(load_attr->name) : 0;
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2015-07-01 02:14:06 +00:00
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bzero(&attr, sizeof(attr));
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2018-03-30 22:08:01 +00:00
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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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attr.insn_cnt = (__u32)load_attr->insns_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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2015-07-01 02:14:06 +00:00
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attr.log_buf = ptr_to_u64(NULL);
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attr.log_size = 0;
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attr.log_level = 0;
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2018-03-30 22:08:01 +00:00
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attr.kern_version = load_attr->kern_version;
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memcpy(attr.prog_name, load_attr->name,
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min(name_len, BPF_OBJ_NAME_LEN - 1));
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2015-07-01 02:14:06 +00:00
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fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
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if (fd >= 0 || !log_buf || !log_buf_sz)
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return fd;
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/* Try again with log */
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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 = 1;
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log_buf[0] = 0;
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return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
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}
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2015-11-24 13:36:08 +00:00
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2017-09-27 21:37:54 +00:00
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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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2018-03-30 22:08:01 +00:00
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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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2017-09-27 21:37:54 +00:00
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}
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2017-05-10 18:42:48 +00:00
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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, int strict_alignment,
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const char *license, __u32 kern_version,
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2017-07-20 22:00:22 +00:00
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char *log_buf, size_t log_buf_sz, int log_level)
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2017-05-10 18:42:48 +00:00
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{
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union bpf_attr attr;
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bzero(&attr, 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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2017-07-20 22:00:22 +00:00
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attr.log_level = log_level;
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2017-05-10 18:42:48 +00:00
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log_buf[0] = 0;
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attr.kern_version = kern_version;
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attr.prog_flags = strict_alignment ? BPF_F_STRICT_ALIGNMENT : 0;
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return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
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}
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2017-02-09 23:21:39 +00:00
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int bpf_map_update_elem(int fd, const void *key, const void *value,
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2016-12-09 02:46:15 +00:00
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__u64 flags)
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2015-11-24 13:36:08 +00:00
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{
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union bpf_attr attr;
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bzero(&attr, 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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return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
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}
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2016-11-26 07:03:25 +00:00
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2017-02-09 23:21:40 +00:00
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int bpf_map_lookup_elem(int fd, const void *key, void *value)
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2016-11-26 07:03:25 +00:00
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{
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union bpf_attr attr;
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bzero(&attr, 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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return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
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}
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2017-02-09 23:21:41 +00:00
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int bpf_map_delete_elem(int fd, const void *key)
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2016-11-26 07:03:25 +00:00
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.map_fd = fd;
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attr.key = ptr_to_u64(key);
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return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
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}
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2017-02-09 23:21:42 +00:00
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int bpf_map_get_next_key(int fd, const void *key, void *next_key)
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2016-11-26 07:03:25 +00:00
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{
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union bpf_attr attr;
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bzero(&attr, 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.next_key = ptr_to_u64(next_key);
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return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
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}
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int bpf_obj_pin(int fd, const char *pathname)
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.pathname = ptr_to_u64((void *)pathname);
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attr.bpf_fd = fd;
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return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
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}
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int bpf_obj_get(const char *pathname)
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.pathname = ptr_to_u64((void *)pathname);
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return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
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}
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2016-12-14 22:05:26 +00:00
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2017-08-28 14:10:04 +00:00
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int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
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unsigned int flags)
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2016-12-14 22:05:26 +00:00
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.target_fd = target_fd;
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2017-08-28 14:10:04 +00:00
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attr.attach_bpf_fd = prog_fd;
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2016-12-14 22:05:26 +00:00
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attr.attach_type = type;
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2017-02-11 04:28:24 +00:00
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attr.attach_flags = flags;
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2016-12-14 22:05:26 +00:00
|
|
|
|
|
|
|
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));
|
|
|
|
}
|
2017-03-31 04:45:39 +00:00
|
|
|
|
2017-10-03 05:50:24 +00:00
|
|
|
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));
|
|
|
|
}
|
|
|
|
|
2017-10-03 05:50:27 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2017-03-31 04:45:39 +00:00
|
|
|
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;
|
|
|
|
}
|
2017-06-05 19:15:53 +00:00
|
|
|
|
|
|
|
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_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;
|
|
|
|
}
|
2018-01-30 20:55:01 +00:00
|
|
|
|
2018-03-28 19:05:38 +00:00
|
|
|
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));
|
|
|
|
}
|
|
|
|
|
2018-01-30 20:55:01 +00:00
|
|
|
int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags)
|
|
|
|
{
|
|
|
|
struct sockaddr_nl sa;
|
|
|
|
int sock, seq = 0, len, ret = -1;
|
|
|
|
char buf[4096];
|
|
|
|
struct nlattr *nla, *nla_xdp;
|
|
|
|
struct {
|
|
|
|
struct nlmsghdr nh;
|
|
|
|
struct ifinfomsg ifinfo;
|
|
|
|
char attrbuf[64];
|
|
|
|
} req;
|
|
|
|
struct nlmsghdr *nh;
|
|
|
|
struct nlmsgerr *err;
|
|
|
|
socklen_t addrlen;
|
2018-01-30 20:55:02 +00:00
|
|
|
int one = 1;
|
2018-01-30 20:55:01 +00:00
|
|
|
|
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
|
|
sa.nl_family = AF_NETLINK;
|
|
|
|
|
|
|
|
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
|
|
|
if (sock < 0) {
|
|
|
|
return -errno;
|
|
|
|
}
|
|
|
|
|
2018-01-30 20:55:02 +00:00
|
|
|
if (setsockopt(sock, SOL_NETLINK, NETLINK_EXT_ACK,
|
|
|
|
&one, sizeof(one)) < 0) {
|
|
|
|
fprintf(stderr, "Netlink error reporting not supported\n");
|
|
|
|
}
|
|
|
|
|
2018-01-30 20:55:01 +00:00
|
|
|
if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
|
|
|
|
ret = -errno;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
|
|
|
|
addrlen = sizeof(sa);
|
|
|
|
if (getsockname(sock, (struct sockaddr *)&sa, &addrlen) < 0) {
|
|
|
|
ret = -errno;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (addrlen != sizeof(sa)) {
|
|
|
|
ret = -LIBBPF_ERRNO__INTERNAL;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
|
|
|
|
memset(&req, 0, sizeof(req));
|
|
|
|
req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
|
|
|
|
req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
|
|
req.nh.nlmsg_type = RTM_SETLINK;
|
|
|
|
req.nh.nlmsg_pid = 0;
|
|
|
|
req.nh.nlmsg_seq = ++seq;
|
|
|
|
req.ifinfo.ifi_family = AF_UNSPEC;
|
|
|
|
req.ifinfo.ifi_index = ifindex;
|
|
|
|
|
|
|
|
/* started nested attribute for XDP */
|
|
|
|
nla = (struct nlattr *)(((char *)&req)
|
|
|
|
+ NLMSG_ALIGN(req.nh.nlmsg_len));
|
|
|
|
nla->nla_type = NLA_F_NESTED | IFLA_XDP;
|
|
|
|
nla->nla_len = NLA_HDRLEN;
|
|
|
|
|
|
|
|
/* add XDP fd */
|
|
|
|
nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
|
|
|
|
nla_xdp->nla_type = IFLA_XDP_FD;
|
|
|
|
nla_xdp->nla_len = NLA_HDRLEN + sizeof(int);
|
|
|
|
memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd));
|
|
|
|
nla->nla_len += nla_xdp->nla_len;
|
|
|
|
|
|
|
|
/* if user passed in any flags, add those too */
|
|
|
|
if (flags) {
|
|
|
|
nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
|
|
|
|
nla_xdp->nla_type = IFLA_XDP_FLAGS;
|
|
|
|
nla_xdp->nla_len = NLA_HDRLEN + sizeof(flags);
|
|
|
|
memcpy((char *)nla_xdp + NLA_HDRLEN, &flags, sizeof(flags));
|
|
|
|
nla->nla_len += nla_xdp->nla_len;
|
|
|
|
}
|
|
|
|
|
|
|
|
req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len);
|
|
|
|
|
|
|
|
if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
|
|
|
|
ret = -errno;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
|
|
|
|
len = recv(sock, buf, sizeof(buf), 0);
|
|
|
|
if (len < 0) {
|
|
|
|
ret = -errno;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len);
|
|
|
|
nh = NLMSG_NEXT(nh, len)) {
|
|
|
|
if (nh->nlmsg_pid != sa.nl_pid) {
|
|
|
|
ret = -LIBBPF_ERRNO__WRNGPID;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
if (nh->nlmsg_seq != seq) {
|
|
|
|
ret = -LIBBPF_ERRNO__INVSEQ;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
switch (nh->nlmsg_type) {
|
|
|
|
case NLMSG_ERROR:
|
|
|
|
err = (struct nlmsgerr *)NLMSG_DATA(nh);
|
|
|
|
if (!err->error)
|
|
|
|
continue;
|
|
|
|
ret = err->error;
|
2018-01-30 20:55:02 +00:00
|
|
|
nla_dump_errormsg(nh);
|
2018-01-30 20:55:01 +00:00
|
|
|
goto cleanup;
|
|
|
|
case NLMSG_DONE:
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = 0;
|
|
|
|
|
|
|
|
cleanup:
|
|
|
|
close(sock);
|
|
|
|
return ret;
|
|
|
|
}
|