mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-20 05:38:28 +07:00
d777b2ddbe
The buffer passed to bpf_obj_get_info_by_fd() should be initialized
to zeros. Kernel will enforce that to guarantee we can safely extend
info structures in the future.
Making the bpf_obj_get_info_by_fd() call in libbpf perform the zeroing
is problematic, however, since some members of the info structures
may need to be initialized by the callers (for instance pointers
to buffers to which kernel is to dump translated and jited images).
Remove the zeroing and fix up the in-tree callers before any kernel
has been released with this code.
As Daniel points out this seems to be the intended operation anyway,
since commit 95b9afd398 ("bpf: Test for bpf ID") is itself setting
the buffer pointers before calling bpf_obj_get_info_by_fd().
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
327 lines
7.5 KiB
C
327 lines
7.5 KiB
C
/*
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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 <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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/*
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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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# 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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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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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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attr.map_flags = map_flags;
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return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
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}
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int bpf_create_map_in_map(enum bpf_map_type map_type, int key_size,
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int inner_map_fd, int max_entries, __u32 map_flags)
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{
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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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return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
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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, size_t log_buf_sz)
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{
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int fd;
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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(NULL);
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attr.log_size = 0;
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attr.log_level = 0;
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attr.kern_version = kern_version;
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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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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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char *log_buf, size_t log_buf_sz, int log_level)
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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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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 = 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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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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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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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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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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int bpf_map_delete_elem(int fd, const void *key)
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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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int bpf_map_get_next_key(int fd, const void *key, void *next_key)
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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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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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{
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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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attr.attach_bpf_fd = prog_fd;
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attr.attach_type = type;
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attr.attach_flags = flags;
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return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
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}
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int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
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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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attr.attach_type = type;
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return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
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}
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int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
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void *data_out, __u32 *size_out, __u32 *retval,
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__u32 *duration)
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{
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union bpf_attr attr;
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int ret;
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bzero(&attr, sizeof(attr));
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attr.test.prog_fd = prog_fd;
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attr.test.data_in = ptr_to_u64(data);
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attr.test.data_out = ptr_to_u64(data_out);
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attr.test.data_size_in = size;
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attr.test.repeat = repeat;
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ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
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if (size_out)
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*size_out = attr.test.data_size_out;
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if (retval)
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*retval = attr.test.retval;
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if (duration)
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*duration = attr.test.duration;
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return ret;
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}
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int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
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{
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union bpf_attr attr;
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int err;
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bzero(&attr, sizeof(attr));
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attr.start_id = start_id;
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err = sys_bpf(BPF_PROG_GET_NEXT_ID, &attr, sizeof(attr));
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if (!err)
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*next_id = attr.next_id;
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return err;
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}
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int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
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{
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union bpf_attr attr;
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int err;
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bzero(&attr, sizeof(attr));
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attr.start_id = start_id;
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err = sys_bpf(BPF_MAP_GET_NEXT_ID, &attr, sizeof(attr));
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if (!err)
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*next_id = attr.next_id;
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return err;
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}
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int bpf_prog_get_fd_by_id(__u32 id)
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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_id = id;
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return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
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}
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int bpf_map_get_fd_by_id(__u32 id)
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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_id = id;
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return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
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}
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int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len)
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{
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union bpf_attr attr;
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int err;
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bzero(&attr, sizeof(attr));
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attr.info.bpf_fd = prog_fd;
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attr.info.info_len = *info_len;
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attr.info.info = ptr_to_u64(info);
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err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
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if (!err)
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*info_len = attr.info.info_len;
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return err;
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}
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