mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-06 12:44:14 +08:00
ae24345da5
The target can call bpf_iter_reg_target() to register itself.
The needed information:
target: target name
seq_ops: the seq_file operations for the target
init_seq_private target callback to initialize seq_priv during file open
fini_seq_private target callback to clean up seq_priv during file release
seq_priv_size: the private_data size needed by the seq_file
operations
The target name represents a target which provides a seq_ops
for iterating objects.
The target can provide two callback functions, init_seq_private
and fini_seq_private, called during file open/release time.
For example, /proc/net/{tcp6, ipv6_route, netlink, ...}, net
name space needs to be setup properly during file open and
released properly during file release.
Function bpf_iter_unreg_target() is also implemented to unregister
a particular target.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200509175859.2474669-1-yhs@fb.com
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Copyright (c) 2020 Facebook */
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/filter.h>
|
|
#include <linux/bpf.h>
|
|
|
|
struct bpf_iter_target_info {
|
|
struct list_head list;
|
|
const char *target;
|
|
const struct seq_operations *seq_ops;
|
|
bpf_iter_init_seq_priv_t init_seq_private;
|
|
bpf_iter_fini_seq_priv_t fini_seq_private;
|
|
u32 seq_priv_size;
|
|
};
|
|
|
|
static struct list_head targets = LIST_HEAD_INIT(targets);
|
|
static DEFINE_MUTEX(targets_mutex);
|
|
|
|
int bpf_iter_reg_target(struct bpf_iter_reg *reg_info)
|
|
{
|
|
struct bpf_iter_target_info *tinfo;
|
|
|
|
tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
|
|
if (!tinfo)
|
|
return -ENOMEM;
|
|
|
|
tinfo->target = reg_info->target;
|
|
tinfo->seq_ops = reg_info->seq_ops;
|
|
tinfo->init_seq_private = reg_info->init_seq_private;
|
|
tinfo->fini_seq_private = reg_info->fini_seq_private;
|
|
tinfo->seq_priv_size = reg_info->seq_priv_size;
|
|
INIT_LIST_HEAD(&tinfo->list);
|
|
|
|
mutex_lock(&targets_mutex);
|
|
list_add(&tinfo->list, &targets);
|
|
mutex_unlock(&targets_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bpf_iter_unreg_target(const char *target)
|
|
{
|
|
struct bpf_iter_target_info *tinfo;
|
|
bool found = false;
|
|
|
|
mutex_lock(&targets_mutex);
|
|
list_for_each_entry(tinfo, &targets, list) {
|
|
if (!strcmp(target, tinfo->target)) {
|
|
list_del(&tinfo->list);
|
|
kfree(tinfo);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&targets_mutex);
|
|
|
|
WARN_ON(found == false);
|
|
}
|