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f9c7927295
This patch refactored target bpf_iter_init_seq_priv_t callback function to accept additional information. This will be needed in later patches for map element targets since a particular map should be passed to traverse elements for that particular map. In the future, other information may be passed to target as well, e.g., pid, cgroup id, etc. to customize the iterator. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200723184110.590156-1-yhs@fb.com
216 lines
8 KiB
C
216 lines
8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* The proc filesystem constants/structures
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*/
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#ifndef _LINUX_PROC_FS_H
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#define _LINUX_PROC_FS_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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struct proc_dir_entry;
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struct seq_file;
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struct seq_operations;
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enum {
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/*
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* All /proc entries using this ->proc_ops instance are never removed.
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*
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* If in doubt, ignore this flag.
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*/
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#ifdef MODULE
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PROC_ENTRY_PERMANENT = 0U,
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#else
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PROC_ENTRY_PERMANENT = 1U << 0,
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#endif
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};
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struct proc_ops {
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unsigned int proc_flags;
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int (*proc_open)(struct inode *, struct file *);
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ssize_t (*proc_read)(struct file *, char __user *, size_t, loff_t *);
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ssize_t (*proc_write)(struct file *, const char __user *, size_t, loff_t *);
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loff_t (*proc_lseek)(struct file *, loff_t, int);
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int (*proc_release)(struct inode *, struct file *);
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__poll_t (*proc_poll)(struct file *, struct poll_table_struct *);
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long (*proc_ioctl)(struct file *, unsigned int, unsigned long);
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#ifdef CONFIG_COMPAT
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long (*proc_compat_ioctl)(struct file *, unsigned int, unsigned long);
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#endif
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int (*proc_mmap)(struct file *, struct vm_area_struct *);
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unsigned long (*proc_get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
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} __randomize_layout;
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/* definitions for hide_pid field */
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enum proc_hidepid {
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HIDEPID_OFF = 0,
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HIDEPID_NO_ACCESS = 1,
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HIDEPID_INVISIBLE = 2,
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HIDEPID_NOT_PTRACEABLE = 4, /* Limit pids to only ptraceable pids */
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};
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/* definitions for proc mount option pidonly */
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enum proc_pidonly {
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PROC_PIDONLY_OFF = 0,
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PROC_PIDONLY_ON = 1,
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};
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struct proc_fs_info {
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struct pid_namespace *pid_ns;
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struct dentry *proc_self; /* For /proc/self */
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struct dentry *proc_thread_self; /* For /proc/thread-self */
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kgid_t pid_gid;
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enum proc_hidepid hide_pid;
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enum proc_pidonly pidonly;
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};
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static inline struct proc_fs_info *proc_sb_info(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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#ifdef CONFIG_PROC_FS
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typedef int (*proc_write_t)(struct file *, char *, size_t);
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extern void proc_root_init(void);
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extern void proc_flush_pid(struct pid *);
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extern struct proc_dir_entry *proc_symlink(const char *,
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struct proc_dir_entry *, const char *);
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extern struct proc_dir_entry *proc_mkdir(const char *, struct proc_dir_entry *);
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extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
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struct proc_dir_entry *, void *);
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extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
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struct proc_dir_entry *);
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struct proc_dir_entry *proc_create_mount_point(const char *name);
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struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
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struct proc_dir_entry *parent, const struct seq_operations *ops,
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unsigned int state_size, void *data);
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#define proc_create_seq_data(name, mode, parent, ops, data) \
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proc_create_seq_private(name, mode, parent, ops, 0, data)
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#define proc_create_seq(name, mode, parent, ops) \
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proc_create_seq_private(name, mode, parent, ops, 0, NULL)
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struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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int (*show)(struct seq_file *, void *), void *data);
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#define proc_create_single(name, mode, parent, show) \
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proc_create_single_data(name, mode, parent, show, NULL)
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extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
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struct proc_dir_entry *,
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const struct proc_ops *,
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void *);
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struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct proc_ops *proc_ops);
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extern void proc_set_size(struct proc_dir_entry *, loff_t);
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extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
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extern void *PDE_DATA(const struct inode *);
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extern void *proc_get_parent_data(const struct inode *);
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extern void proc_remove(struct proc_dir_entry *);
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extern void remove_proc_entry(const char *, struct proc_dir_entry *);
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extern int remove_proc_subtree(const char *, struct proc_dir_entry *);
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struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
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struct proc_dir_entry *parent, const struct seq_operations *ops,
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unsigned int state_size, void *data);
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#define proc_create_net(name, mode, parent, ops, state_size) \
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proc_create_net_data(name, mode, parent, ops, state_size, NULL)
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struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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int (*show)(struct seq_file *, void *), void *data);
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struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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const struct seq_operations *ops,
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proc_write_t write,
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unsigned int state_size, void *data);
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struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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int (*show)(struct seq_file *, void *),
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proc_write_t write,
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void *data);
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extern struct pid *tgid_pidfd_to_pid(const struct file *file);
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struct bpf_iter_aux_info;
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extern int bpf_iter_init_seq_net(void *priv_data, struct bpf_iter_aux_info *aux);
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extern void bpf_iter_fini_seq_net(void *priv_data);
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#ifdef CONFIG_PROC_PID_ARCH_STATUS
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/*
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* The architecture which selects CONFIG_PROC_PID_ARCH_STATUS must
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* provide proc_pid_arch_status() definition.
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*/
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int proc_pid_arch_status(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task);
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#endif /* CONFIG_PROC_PID_ARCH_STATUS */
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#else /* CONFIG_PROC_FS */
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static inline void proc_root_init(void)
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{
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}
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static inline void proc_flush_pid(struct pid *pid)
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{
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}
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static inline struct proc_dir_entry *proc_symlink(const char *name,
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struct proc_dir_entry *parent,const char *dest) { return NULL;}
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static inline struct proc_dir_entry *proc_mkdir(const char *name,
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struct proc_dir_entry *parent) {return NULL;}
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static inline struct proc_dir_entry *proc_create_mount_point(const char *name) { return NULL; }
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static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
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umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
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static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
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umode_t mode, struct proc_dir_entry *parent) { return NULL; }
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#define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;})
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#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
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#define proc_create_seq(name, mode, parent, ops) ({NULL;})
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#define proc_create_single(name, mode, parent, show) ({NULL;})
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#define proc_create_single_data(name, mode, parent, show, data) ({NULL;})
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#define proc_create(name, mode, parent, proc_ops) ({NULL;})
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#define proc_create_data(name, mode, parent, proc_ops, data) ({NULL;})
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static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
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static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
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static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;}
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static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; }
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static inline void proc_remove(struct proc_dir_entry *de) {}
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#define remove_proc_entry(name, parent) do {} while (0)
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static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; }
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#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
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#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
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#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})
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static inline struct pid *tgid_pidfd_to_pid(const struct file *file)
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{
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return ERR_PTR(-EBADF);
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}
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#endif /* CONFIG_PROC_FS */
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struct net;
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static inline struct proc_dir_entry *proc_net_mkdir(
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struct net *net, const char *name, struct proc_dir_entry *parent)
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{
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return proc_mkdir_data(name, 0, parent, net);
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}
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struct ns_common;
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int open_related_ns(struct ns_common *ns,
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struct ns_common *(*get_ns)(struct ns_common *ns));
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/* get the associated pid namespace for a file in procfs */
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static inline struct pid_namespace *proc_pid_ns(struct super_block *sb)
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{
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return proc_sb_info(sb)->pid_ns;
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}
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bool proc_ns_file(const struct file *file);
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#endif /* _LINUX_PROC_FS_H */
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