linux/fs/afs/addr_prefs.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* Address preferences management
 *
 * Copyright (C) 2023 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 */

#define pr_fmt(fmt) …
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/seq_file.h>
#include <keys/rxrpc-type.h>
#include "internal.h"

static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
{ … }

/*
 * Split a NUL-terminated string up to the first newline around spaces.  The
 * source string will be modified to have NUL-terminations inserted.
 */
static int afs_split_string(char **pbuf, char *strv[], unsigned int maxstrv)
{ … }

/*
 * Parse an address with an optional subnet mask.
 */
static int afs_parse_address(char *p, struct afs_addr_preference *pref)
{ … }

enum cmp_ret { … };

/*
 * See if a candidate address matches a listed address.
 */
static enum cmp_ret afs_cmp_address_pref(const struct afs_addr_preference *a,
					 const struct afs_addr_preference *b)
{ … }

/*
 * Insert an address preference.
 */
static int afs_insert_address_pref(struct afs_addr_preference_list **_preflist,
				   struct afs_addr_preference *pref,
				   int index)
{ … }

/*
 * Add an address preference.
 *	echo "add <proto> <IP>[/<mask>] <prior>" >/proc/fs/afs/addr_prefs
 */
static int afs_add_address_pref(struct afs_net *net, struct afs_addr_preference_list **_preflist,
				int argc, char **argv)
{ … }

/*
 * Delete an address preference.
 */
static int afs_delete_address_pref(struct afs_addr_preference_list **_preflist,
				   int index)
{ … }

/*
 * Delete an address preference.
 *	echo "del <proto> <IP>[/<mask>]" >/proc/fs/afs/addr_prefs
 */
static int afs_del_address_pref(struct afs_net *net, struct afs_addr_preference_list **_preflist,
				int argc, char **argv)
{ … }

/*
 * Handle writes to /proc/fs/afs/addr_prefs
 */
int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size)
{ … }

/*
 * Mark the priorities on an address list if the address preferences table has
 * changed.  The caller must hold the RCU read lock.
 */
void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist)
{ … }

/*
 * Mark the priorities on an address list if the address preferences table has
 * changed.  Avoid taking the RCU read lock if we can.
 */
void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist)
{ … }