Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2020 Facebook */
#include <linux/init.h>
#include <linux/namei.h>
#include <linux/pid_namespace.h>
#include <linux/fs.h>
#include <linux/fdtable.h>
#include <linux/filter.h>
#include <linux/btf_ids.h>
struct bpf_iter_seq_task_common {
<------>struct pid_namespace *ns;
};
struct bpf_iter_seq_task_info {
<------>/* The first field must be struct bpf_iter_seq_task_common.
<------> * this is assumed by {init, fini}_seq_pidns() callback functions.
<------> */
<------>struct bpf_iter_seq_task_common common;
<------>u32 tid;
};
static struct task_struct *task_seq_get_next(struct pid_namespace *ns,
<------><------><------><------><------> u32 *tid,
<------><------><------><------><------> bool skip_if_dup_files)
{
<------>struct task_struct *task = NULL;
<------>struct pid *pid;
<------>rcu_read_lock();
retry:
<------>pid = find_ge_pid(*tid, ns);
<------>if (pid) {
<------><------>*tid = pid_nr_ns(pid, ns);
<------><------>task = get_pid_task(pid, PIDTYPE_PID);
<------><------>if (!task) {
<------><------><------>++*tid;
<------><------><------>goto retry;
<------><------>} else if (skip_if_dup_files && task->tgid != task->pid &&
<------><------><------> task->files == task->group_leader->files) {
<------><------><------>put_task_struct(task);
<------><------><------>task = NULL;
<------><------><------>++*tid;
<------><------><------>goto retry;
<------><------>}
<------>}
<------>rcu_read_unlock();
<------>return task;
}
static void *task_seq_start(struct seq_file *seq, loff_t *pos)
{
<------>struct bpf_iter_seq_task_info *info = seq->private;
<------>struct task_struct *task;
<------>task = task_seq_get_next(info->common.ns, &info->tid, false);
<------>if (!task)
<------><------>return NULL;
<------>if (*pos == 0)
<------><------>++*pos;
<------>return task;
}
static void *task_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
<------>struct bpf_iter_seq_task_info *info = seq->private;
<------>struct task_struct *task;
<------>++*pos;
<------>++info->tid;
<------>put_task_struct((struct task_struct *)v);
<------>task = task_seq_get_next(info->common.ns, &info->tid, false);
<------>if (!task)
<------><------>return NULL;
<------>return task;
}
struct bpf_iter__task {
<------>__bpf_md_ptr(struct bpf_iter_meta *, meta);
<------>__bpf_md_ptr(struct task_struct *, task);
};
DEFINE_BPF_ITER_FUNC(task, struct bpf_iter_meta *meta, struct task_struct *task)
static int __task_seq_show(struct seq_file *seq, struct task_struct *task,
<------><------><------> bool in_stop)
{
<------>struct bpf_iter_meta meta;
<------>struct bpf_iter__task ctx;
<------>struct bpf_prog *prog;
<------>meta.seq = seq;
<------>prog = bpf_iter_get_info(&meta, in_stop);
<------>if (!prog)
<------><------>return 0;
<------>meta.seq = seq;
<------>ctx.meta = &meta;
<------>ctx.task = task;
<------>return bpf_iter_run_prog(prog, &ctx);
}
static int task_seq_show(struct seq_file *seq, void *v)
{
<------>return __task_seq_show(seq, v, false);
}
static void task_seq_stop(struct seq_file *seq, void *v)
{
<------>if (!v)
<------><------>(void)__task_seq_show(seq, v, true);
<------>else
<------><------>put_task_struct((struct task_struct *)v);
}
static const struct seq_operations task_seq_ops = {
<------>.start = task_seq_start,
<------>.next = task_seq_next,
<------>.stop = task_seq_stop,
<------>.show = task_seq_show,
};
struct bpf_iter_seq_task_file_info {
<------>/* The first field must be struct bpf_iter_seq_task_common.
<------> * this is assumed by {init, fini}_seq_pidns() callback functions.
<------> */
<------>struct bpf_iter_seq_task_common common;
<------>struct task_struct *task;
<------>struct files_struct *files;
<------>u32 tid;
<------>u32 fd;
};
static struct file *
task_file_seq_get_next(struct bpf_iter_seq_task_file_info *info)
{
<------>struct pid_namespace *ns = info->common.ns;
<------>u32 curr_tid = info->tid, max_fds;
<------>struct files_struct *curr_files;
<------>struct task_struct *curr_task;
<------>int curr_fd = info->fd;
<------>/* If this function returns a non-NULL file object,
<------> * it held a reference to the task/files_struct/file.
<------> * Otherwise, it does not hold any reference.
<------> */
again:
<------>if (info->task) {
<------><------>curr_task = info->task;
<------><------>curr_files = info->files;
<------><------>curr_fd = info->fd;
<------>} else {
<------><------>curr_task = task_seq_get_next(ns, &curr_tid, true);
<------><------>if (!curr_task) {
<------><------><------>info->task = NULL;
<------><------><------>info->files = NULL;
<------><------><------>info->tid = curr_tid;
<------><------><------>return NULL;
<------><------>}
<------><------>curr_files = get_files_struct(curr_task);
<------><------>if (!curr_files) {
<------><------><------>put_task_struct(curr_task);
<------><------><------>curr_tid = curr_tid + 1;
<------><------><------>info->fd = 0;
<------><------><------>goto again;
<------><------>}
<------><------>info->files = curr_files;
<------><------>info->task = curr_task;
<------><------>if (curr_tid == info->tid) {
<------><------><------>curr_fd = info->fd;
<------><------>} else {
<------><------><------>info->tid = curr_tid;
<------><------><------>curr_fd = 0;
<------><------>}
<------>}
<------>rcu_read_lock();
<------>max_fds = files_fdtable(curr_files)->max_fds;
<------>for (; curr_fd < max_fds; curr_fd++) {
<------><------>struct file *f;
<------><------>f = fcheck_files(curr_files, curr_fd);
<------><------>if (!f)
<------><------><------>continue;
<------><------>if (!get_file_rcu(f))
<------><------><------>continue;
<------><------>/* set info->fd */
<------><------>info->fd = curr_fd;
<------><------>rcu_read_unlock();
<------><------>return f;
<------>}
<------>/* the current task is done, go to the next task */
<------>rcu_read_unlock();
<------>put_files_struct(curr_files);
<------>put_task_struct(curr_task);
<------>info->task = NULL;
<------>info->files = NULL;
<------>info->fd = 0;
<------>curr_tid = ++(info->tid);
<------>goto again;
}
static void *task_file_seq_start(struct seq_file *seq, loff_t *pos)
{
<------>struct bpf_iter_seq_task_file_info *info = seq->private;
<------>struct file *file;
<------>info->task = NULL;
<------>info->files = NULL;
<------>file = task_file_seq_get_next(info);
<------>if (file && *pos == 0)
<------><------>++*pos;
<------>return file;
}
static void *task_file_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
<------>struct bpf_iter_seq_task_file_info *info = seq->private;
<------>++*pos;
<------>++info->fd;
<------>fput((struct file *)v);
<------>return task_file_seq_get_next(info);
}
struct bpf_iter__task_file {
<------>__bpf_md_ptr(struct bpf_iter_meta *, meta);
<------>__bpf_md_ptr(struct task_struct *, task);
<------>u32 fd __aligned(8);
<------>__bpf_md_ptr(struct file *, file);
};
DEFINE_BPF_ITER_FUNC(task_file, struct bpf_iter_meta *meta,
<------><------> struct task_struct *task, u32 fd,
<------><------> struct file *file)
static int __task_file_seq_show(struct seq_file *seq, struct file *file,
<------><------><------><------>bool in_stop)
{
<------>struct bpf_iter_seq_task_file_info *info = seq->private;
<------>struct bpf_iter__task_file ctx;
<------>struct bpf_iter_meta meta;
<------>struct bpf_prog *prog;
<------>meta.seq = seq;
<------>prog = bpf_iter_get_info(&meta, in_stop);
<------>if (!prog)
<------><------>return 0;
<------>ctx.meta = &meta;
<------>ctx.task = info->task;
<------>ctx.fd = info->fd;
<------>ctx.file = file;
<------>return bpf_iter_run_prog(prog, &ctx);
}
static int task_file_seq_show(struct seq_file *seq, void *v)
{
<------>return __task_file_seq_show(seq, v, false);
}
static void task_file_seq_stop(struct seq_file *seq, void *v)
{
<------>struct bpf_iter_seq_task_file_info *info = seq->private;
<------>if (!v) {
<------><------>(void)__task_file_seq_show(seq, v, true);
<------>} else {
<------><------>fput((struct file *)v);
<------><------>put_files_struct(info->files);
<------><------>put_task_struct(info->task);
<------><------>info->files = NULL;
<------><------>info->task = NULL;
<------>}
}
static int init_seq_pidns(void *priv_data, struct bpf_iter_aux_info *aux)
{
<------>struct bpf_iter_seq_task_common *common = priv_data;
<------>common->ns = get_pid_ns(task_active_pid_ns(current));
<------>return 0;
}
static void fini_seq_pidns(void *priv_data)
{
<------>struct bpf_iter_seq_task_common *common = priv_data;
<------>put_pid_ns(common->ns);
}
static const struct seq_operations task_file_seq_ops = {
<------>.start = task_file_seq_start,
<------>.next = task_file_seq_next,
<------>.stop = task_file_seq_stop,
<------>.show = task_file_seq_show,
};
BTF_ID_LIST(btf_task_file_ids)
BTF_ID(struct, task_struct)
BTF_ID(struct, file)
static const struct bpf_iter_seq_info task_seq_info = {
<------>.seq_ops = &task_seq_ops,
<------>.init_seq_private = init_seq_pidns,
<------>.fini_seq_private = fini_seq_pidns,
<------>.seq_priv_size = sizeof(struct bpf_iter_seq_task_info),
};
static struct bpf_iter_reg task_reg_info = {
<------>.target = "task",
<------>.ctx_arg_info_size = 1,
<------>.ctx_arg_info = {
<------><------>{ offsetof(struct bpf_iter__task, task),
<------><------> PTR_TO_BTF_ID_OR_NULL },
<------>},
<------>.seq_info = &task_seq_info,
};
static const struct bpf_iter_seq_info task_file_seq_info = {
<------>.seq_ops = &task_file_seq_ops,
<------>.init_seq_private = init_seq_pidns,
<------>.fini_seq_private = fini_seq_pidns,
<------>.seq_priv_size = sizeof(struct bpf_iter_seq_task_file_info),
};
static struct bpf_iter_reg task_file_reg_info = {
<------>.target = "task_file",
<------>.ctx_arg_info_size = 2,
<------>.ctx_arg_info = {
<------><------>{ offsetof(struct bpf_iter__task_file, task),
<------><------> PTR_TO_BTF_ID_OR_NULL },
<------><------>{ offsetof(struct bpf_iter__task_file, file),
<------><------> PTR_TO_BTF_ID_OR_NULL },
<------>},
<------>.seq_info = &task_file_seq_info,
};
static int __init task_iter_init(void)
{
<------>int ret;
<------>task_reg_info.ctx_arg_info[0].btf_id = btf_task_file_ids[0];
<------>ret = bpf_iter_reg_target(&task_reg_info);
<------>if (ret)
<------><------>return ret;
<------>task_file_reg_info.ctx_arg_info[0].btf_id = btf_task_file_ids[0];
<------>task_file_reg_info.ctx_arg_info[1].btf_id = btf_task_file_ids[1];
<------>return bpf_iter_reg_target(&task_file_reg_info);
}
late_initcall(task_iter_init);