1707 lines
42 KiB
C
1707 lines
42 KiB
C
/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
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* Patrick Schaaf <bof@bof.de>
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* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* Kernel module for IP set management */
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/ip.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/netlink.h>
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#include <linux/rculist.h>
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#include <linux/version.h>
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#include <net/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/ipset/ip_set.h>
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static LIST_HEAD(ip_set_type_list); /* all registered set types */
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static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */
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static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */
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static struct ip_set **ip_set_list; /* all individual sets */
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static ip_set_id_t ip_set_max = CONFIG_IP_SET_MAX; /* max number of sets */
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#define STREQ(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0)
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static unsigned int max_sets;
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module_param(max_sets, int, 0600);
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MODULE_PARM_DESC(max_sets, "maximal number of sets");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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MODULE_DESCRIPTION("core IP set support");
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MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET);
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/*
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* The set types are implemented in modules and registered set types
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* can be found in ip_set_type_list. Adding/deleting types is
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* serialized by ip_set_type_mutex.
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*/
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static inline void
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ip_set_type_lock(void)
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{
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mutex_lock(&ip_set_type_mutex);
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}
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static inline void
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ip_set_type_unlock(void)
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{
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mutex_unlock(&ip_set_type_mutex);
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}
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/* Register and deregister settype */
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static struct ip_set_type *
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find_set_type(const char *name, u8 family, u8 revision)
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{
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struct ip_set_type *type;
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list_for_each_entry_rcu(type, &ip_set_type_list, list)
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if (STREQ(type->name, name) &&
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(type->family == family || type->family == AF_UNSPEC) &&
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type->revision == revision)
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return type;
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return NULL;
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}
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/* Unlock, try to load a set type module and lock again */
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static int
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try_to_load_type(const char *name)
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{
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nfnl_unlock();
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pr_debug("try to load ip_set_%s\n", name);
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if (request_module("ip_set_%s", name) < 0) {
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pr_warning("Can't find ip_set type %s\n", name);
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nfnl_lock();
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return -IPSET_ERR_FIND_TYPE;
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}
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nfnl_lock();
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return -EAGAIN;
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}
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/* Find a set type and reference it */
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static int
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find_set_type_get(const char *name, u8 family, u8 revision,
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struct ip_set_type **found)
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{
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struct ip_set_type *type;
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int err;
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rcu_read_lock();
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*found = find_set_type(name, family, revision);
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if (*found) {
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err = !try_module_get((*found)->me) ? -EFAULT : 0;
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goto unlock;
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}
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/* Make sure the type is loaded but we don't support the revision */
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list_for_each_entry_rcu(type, &ip_set_type_list, list)
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if (STREQ(type->name, name)) {
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err = -IPSET_ERR_FIND_TYPE;
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goto unlock;
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}
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rcu_read_unlock();
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return try_to_load_type(name);
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unlock:
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rcu_read_unlock();
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return err;
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}
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/* Find a given set type by name and family.
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* If we succeeded, the supported minimal and maximum revisions are
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* filled out.
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*/
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static int
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find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max)
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{
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struct ip_set_type *type;
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bool found = false;
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*min = 255; *max = 0;
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rcu_read_lock();
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list_for_each_entry_rcu(type, &ip_set_type_list, list)
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if (STREQ(type->name, name) &&
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(type->family == family || type->family == AF_UNSPEC)) {
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found = true;
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if (type->revision < *min)
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*min = type->revision;
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if (type->revision > *max)
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*max = type->revision;
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}
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rcu_read_unlock();
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if (found)
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return 0;
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return try_to_load_type(name);
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}
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#define family_name(f) ((f) == AF_INET ? "inet" : \
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(f) == AF_INET6 ? "inet6" : "any")
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/* Register a set type structure. The type is identified by
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* the unique triple of name, family and revision.
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*/
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int
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ip_set_type_register(struct ip_set_type *type)
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{
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int ret = 0;
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if (type->protocol != IPSET_PROTOCOL) {
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pr_warning("ip_set type %s, family %s, revision %u uses "
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"wrong protocol version %u (want %u)\n",
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type->name, family_name(type->family),
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type->revision, type->protocol, IPSET_PROTOCOL);
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return -EINVAL;
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}
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ip_set_type_lock();
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if (find_set_type(type->name, type->family, type->revision)) {
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/* Duplicate! */
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pr_warning("ip_set type %s, family %s, revision %u "
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"already registered!\n", type->name,
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family_name(type->family), type->revision);
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ret = -EINVAL;
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goto unlock;
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}
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list_add_rcu(&type->list, &ip_set_type_list);
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pr_debug("type %s, family %s, revision %u registered.\n",
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type->name, family_name(type->family), type->revision);
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unlock:
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ip_set_type_unlock();
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return ret;
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}
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EXPORT_SYMBOL_GPL(ip_set_type_register);
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/* Unregister a set type. There's a small race with ip_set_create */
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void
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ip_set_type_unregister(struct ip_set_type *type)
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{
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ip_set_type_lock();
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if (!find_set_type(type->name, type->family, type->revision)) {
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pr_warning("ip_set type %s, family %s, revision %u "
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"not registered\n", type->name,
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family_name(type->family), type->revision);
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goto unlock;
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}
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list_del_rcu(&type->list);
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pr_debug("type %s, family %s, revision %u unregistered.\n",
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type->name, family_name(type->family), type->revision);
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unlock:
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ip_set_type_unlock();
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synchronize_rcu();
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}
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EXPORT_SYMBOL_GPL(ip_set_type_unregister);
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/* Utility functions */
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void *
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ip_set_alloc(size_t size)
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{
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void *members = NULL;
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if (size < KMALLOC_MAX_SIZE)
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members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
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if (members) {
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pr_debug("%p: allocated with kmalloc\n", members);
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return members;
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}
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members = vzalloc(size);
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if (!members)
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return NULL;
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pr_debug("%p: allocated with vmalloc\n", members);
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return members;
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}
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EXPORT_SYMBOL_GPL(ip_set_alloc);
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void
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ip_set_free(void *members)
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{
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pr_debug("%p: free with %s\n", members,
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is_vmalloc_addr(members) ? "vfree" : "kfree");
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if (is_vmalloc_addr(members))
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vfree(members);
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else
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kfree(members);
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}
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EXPORT_SYMBOL_GPL(ip_set_free);
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static inline bool
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flag_nested(const struct nlattr *nla)
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{
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return nla->nla_type & NLA_F_NESTED;
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}
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static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = {
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[IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 },
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[IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY,
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.len = sizeof(struct in6_addr) },
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};
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int
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ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr)
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{
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struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1];
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if (unlikely(!flag_nested(nla)))
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return -IPSET_ERR_PROTOCOL;
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if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy))
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return -IPSET_ERR_PROTOCOL;
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if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4)))
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return -IPSET_ERR_PROTOCOL;
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*ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4);
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int
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ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr)
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{
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struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1];
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if (unlikely(!flag_nested(nla)))
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return -IPSET_ERR_PROTOCOL;
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if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy))
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return -IPSET_ERR_PROTOCOL;
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if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6)))
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return -IPSET_ERR_PROTOCOL;
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memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]),
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sizeof(struct in6_addr));
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return 0;
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}
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EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6);
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/*
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* Creating/destroying/renaming/swapping affect the existence and
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* the properties of a set. All of these can be executed from userspace
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* only and serialized by the nfnl mutex indirectly from nfnetlink.
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*
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* Sets are identified by their index in ip_set_list and the index
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* is used by the external references (set/SET netfilter modules).
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*
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* The set behind an index may change by swapping only, from userspace.
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*/
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static inline void
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__ip_set_get(ip_set_id_t index)
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{
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write_lock_bh(&ip_set_ref_lock);
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ip_set_list[index]->ref++;
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write_unlock_bh(&ip_set_ref_lock);
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}
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static inline void
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__ip_set_put(ip_set_id_t index)
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{
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write_lock_bh(&ip_set_ref_lock);
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BUG_ON(ip_set_list[index]->ref == 0);
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ip_set_list[index]->ref--;
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write_unlock_bh(&ip_set_ref_lock);
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}
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/*
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* Add, del and test set entries from kernel.
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*
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* The set behind the index must exist and must be referenced
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* so it can't be destroyed (or changed) under our foot.
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*/
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int
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ip_set_test(ip_set_id_t index, const struct sk_buff *skb,
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u8 family, u8 dim, u8 flags)
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{
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struct ip_set *set = ip_set_list[index];
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int ret = 0;
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BUG_ON(set == NULL);
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pr_debug("set %s, index %u\n", set->name, index);
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if (dim < set->type->dimension ||
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!(family == set->family || set->family == AF_UNSPEC))
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return 0;
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read_lock_bh(&set->lock);
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ret = set->variant->kadt(set, skb, IPSET_TEST, family, dim, flags);
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read_unlock_bh(&set->lock);
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if (ret == -EAGAIN) {
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/* Type requests element to be completed */
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pr_debug("element must be competed, ADD is triggered\n");
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write_lock_bh(&set->lock);
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set->variant->kadt(set, skb, IPSET_ADD, family, dim, flags);
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write_unlock_bh(&set->lock);
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ret = 1;
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}
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/* Convert error codes to nomatch */
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return (ret < 0 ? 0 : ret);
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}
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EXPORT_SYMBOL_GPL(ip_set_test);
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int
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ip_set_add(ip_set_id_t index, const struct sk_buff *skb,
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u8 family, u8 dim, u8 flags)
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{
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struct ip_set *set = ip_set_list[index];
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int ret;
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BUG_ON(set == NULL);
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pr_debug("set %s, index %u\n", set->name, index);
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if (dim < set->type->dimension ||
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!(family == set->family || set->family == AF_UNSPEC))
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return 0;
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write_lock_bh(&set->lock);
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ret = set->variant->kadt(set, skb, IPSET_ADD, family, dim, flags);
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write_unlock_bh(&set->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(ip_set_add);
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int
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ip_set_del(ip_set_id_t index, const struct sk_buff *skb,
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u8 family, u8 dim, u8 flags)
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{
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struct ip_set *set = ip_set_list[index];
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int ret = 0;
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BUG_ON(set == NULL);
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pr_debug("set %s, index %u\n", set->name, index);
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if (dim < set->type->dimension ||
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!(family == set->family || set->family == AF_UNSPEC))
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return 0;
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write_lock_bh(&set->lock);
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ret = set->variant->kadt(set, skb, IPSET_DEL, family, dim, flags);
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write_unlock_bh(&set->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(ip_set_del);
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/*
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* Find set by name, reference it once. The reference makes sure the
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* thing pointed to, does not go away under our feet.
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*
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*/
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ip_set_id_t
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ip_set_get_byname(const char *name, struct ip_set **set)
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{
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ip_set_id_t i, index = IPSET_INVALID_ID;
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struct ip_set *s;
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for (i = 0; i < ip_set_max; i++) {
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s = ip_set_list[i];
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if (s != NULL && STREQ(s->name, name)) {
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__ip_set_get(i);
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index = i;
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*set = s;
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}
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}
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return index;
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}
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EXPORT_SYMBOL_GPL(ip_set_get_byname);
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/*
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* If the given set pointer points to a valid set, decrement
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* reference count by 1. The caller shall not assume the index
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* to be valid, after calling this function.
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*
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*/
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void
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ip_set_put_byindex(ip_set_id_t index)
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{
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if (ip_set_list[index] != NULL)
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__ip_set_put(index);
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}
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EXPORT_SYMBOL_GPL(ip_set_put_byindex);
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/*
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* Get the name of a set behind a set index.
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* We assume the set is referenced, so it does exist and
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* can't be destroyed. The set cannot be renamed due to
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* the referencing either.
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*
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*/
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const char *
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ip_set_name_byindex(ip_set_id_t index)
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{
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const struct ip_set *set = ip_set_list[index];
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BUG_ON(set == NULL);
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BUG_ON(set->ref == 0);
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/* Referenced, so it's safe */
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return set->name;
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}
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EXPORT_SYMBOL_GPL(ip_set_name_byindex);
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/*
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* Routines to call by external subsystems, which do not
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* call nfnl_lock for us.
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*/
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|
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/*
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* Find set by name, reference it once. The reference makes sure the
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* thing pointed to, does not go away under our feet.
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*
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* The nfnl mutex is used in the function.
|
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*/
|
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ip_set_id_t
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ip_set_nfnl_get(const char *name)
|
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{
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struct ip_set *s;
|
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ip_set_id_t index;
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|
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nfnl_lock();
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index = ip_set_get_byname(name, &s);
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nfnl_unlock();
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return index;
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}
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EXPORT_SYMBOL_GPL(ip_set_nfnl_get);
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|
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/*
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* Find set by index, reference it once. The reference makes sure the
|
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* thing pointed to, does not go away under our feet.
|
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*
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* The nfnl mutex is used in the function.
|
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*/
|
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ip_set_id_t
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ip_set_nfnl_get_byindex(ip_set_id_t index)
|
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{
|
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if (index > ip_set_max)
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return IPSET_INVALID_ID;
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|
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nfnl_lock();
|
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if (ip_set_list[index])
|
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__ip_set_get(index);
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else
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index = IPSET_INVALID_ID;
|
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nfnl_unlock();
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|
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return index;
|
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}
|
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EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex);
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|
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/*
|
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* If the given set pointer points to a valid set, decrement
|
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* reference count by 1. The caller shall not assume the index
|
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* to be valid, after calling this function.
|
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*
|
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* The nfnl mutex is used in the function.
|
|
*/
|
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void
|
|
ip_set_nfnl_put(ip_set_id_t index)
|
|
{
|
|
nfnl_lock();
|
|
ip_set_put_byindex(index);
|
|
nfnl_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_nfnl_put);
|
|
|
|
/*
|
|
* Communication protocol with userspace over netlink.
|
|
*
|
|
* The commands are serialized by the nfnl mutex.
|
|
*/
|
|
|
|
static inline bool
|
|
protocol_failed(const struct nlattr * const tb[])
|
|
{
|
|
return !tb[IPSET_ATTR_PROTOCOL] ||
|
|
nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL;
|
|
}
|
|
|
|
static inline u32
|
|
flag_exist(const struct nlmsghdr *nlh)
|
|
{
|
|
return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST;
|
|
}
|
|
|
|
static struct nlmsghdr *
|
|
start_msg(struct sk_buff *skb, u32 pid, u32 seq, unsigned int flags,
|
|
enum ipset_cmd cmd)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, cmd | (NFNL_SUBSYS_IPSET << 8),
|
|
sizeof(*nfmsg), flags);
|
|
if (nlh == NULL)
|
|
return NULL;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = AF_INET;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
return nlh;
|
|
}
|
|
|
|
/* Create a set */
|
|
|
|
static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = {
|
|
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
|
|
.len = IPSET_MAXNAMELEN - 1 },
|
|
[IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING,
|
|
.len = IPSET_MAXNAMELEN - 1},
|
|
[IPSET_ATTR_REVISION] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_FAMILY] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_DATA] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static ip_set_id_t
|
|
find_set_id(const char *name)
|
|
{
|
|
ip_set_id_t i, index = IPSET_INVALID_ID;
|
|
const struct ip_set *set;
|
|
|
|
for (i = 0; index == IPSET_INVALID_ID && i < ip_set_max; i++) {
|
|
set = ip_set_list[i];
|
|
if (set != NULL && STREQ(set->name, name))
|
|
index = i;
|
|
}
|
|
return index;
|
|
}
|
|
|
|
static inline struct ip_set *
|
|
find_set(const char *name)
|
|
{
|
|
ip_set_id_t index = find_set_id(name);
|
|
|
|
return index == IPSET_INVALID_ID ? NULL : ip_set_list[index];
|
|
}
|
|
|
|
static int
|
|
find_free_id(const char *name, ip_set_id_t *index, struct ip_set **set)
|
|
{
|
|
ip_set_id_t i;
|
|
|
|
*index = IPSET_INVALID_ID;
|
|
for (i = 0; i < ip_set_max; i++) {
|
|
if (ip_set_list[i] == NULL) {
|
|
if (*index == IPSET_INVALID_ID)
|
|
*index = i;
|
|
} else if (STREQ(name, ip_set_list[i]->name)) {
|
|
/* Name clash */
|
|
*set = ip_set_list[i];
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
if (*index == IPSET_INVALID_ID)
|
|
/* No free slot remained */
|
|
return -IPSET_ERR_MAX_SETS;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ip_set_create(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set *set, *clash = NULL;
|
|
ip_set_id_t index = IPSET_INVALID_ID;
|
|
struct nlattr *tb[IPSET_ATTR_CREATE_MAX+1] = {};
|
|
const char *name, *typename;
|
|
u8 family, revision;
|
|
u32 flags = flag_exist(nlh);
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
attr[IPSET_ATTR_SETNAME] == NULL ||
|
|
attr[IPSET_ATTR_TYPENAME] == NULL ||
|
|
attr[IPSET_ATTR_REVISION] == NULL ||
|
|
attr[IPSET_ATTR_FAMILY] == NULL ||
|
|
(attr[IPSET_ATTR_DATA] != NULL &&
|
|
!flag_nested(attr[IPSET_ATTR_DATA]))))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
name = nla_data(attr[IPSET_ATTR_SETNAME]);
|
|
typename = nla_data(attr[IPSET_ATTR_TYPENAME]);
|
|
family = nla_get_u8(attr[IPSET_ATTR_FAMILY]);
|
|
revision = nla_get_u8(attr[IPSET_ATTR_REVISION]);
|
|
pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n",
|
|
name, typename, family_name(family), revision);
|
|
|
|
/*
|
|
* First, and without any locks, allocate and initialize
|
|
* a normal base set structure.
|
|
*/
|
|
set = kzalloc(sizeof(struct ip_set), GFP_KERNEL);
|
|
if (!set)
|
|
return -ENOMEM;
|
|
rwlock_init(&set->lock);
|
|
strlcpy(set->name, name, IPSET_MAXNAMELEN);
|
|
set->family = family;
|
|
|
|
/*
|
|
* Next, check that we know the type, and take
|
|
* a reference on the type, to make sure it stays available
|
|
* while constructing our new set.
|
|
*
|
|
* After referencing the type, we try to create the type
|
|
* specific part of the set without holding any locks.
|
|
*/
|
|
ret = find_set_type_get(typename, family, revision, &(set->type));
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* Without holding any locks, create private part.
|
|
*/
|
|
if (attr[IPSET_ATTR_DATA] &&
|
|
nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA],
|
|
set->type->create_policy)) {
|
|
ret = -IPSET_ERR_PROTOCOL;
|
|
goto put_out;
|
|
}
|
|
|
|
ret = set->type->create(set, tb, flags);
|
|
if (ret != 0)
|
|
goto put_out;
|
|
|
|
/* BTW, ret==0 here. */
|
|
|
|
/*
|
|
* Here, we have a valid, constructed set and we are protected
|
|
* by the nfnl mutex. Find the first free index in ip_set_list
|
|
* and check clashing.
|
|
*/
|
|
if ((ret = find_free_id(set->name, &index, &clash)) != 0) {
|
|
/* If this is the same set and requested, ignore error */
|
|
if (ret == -EEXIST &&
|
|
(flags & IPSET_FLAG_EXIST) &&
|
|
STREQ(set->type->name, clash->type->name) &&
|
|
set->type->family == clash->type->family &&
|
|
set->type->revision == clash->type->revision &&
|
|
set->variant->same_set(set, clash))
|
|
ret = 0;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Finally! Add our shiny new set to the list, and be done.
|
|
*/
|
|
pr_debug("create: '%s' created with index %u!\n", set->name, index);
|
|
ip_set_list[index] = set;
|
|
|
|
return ret;
|
|
|
|
cleanup:
|
|
set->variant->destroy(set);
|
|
put_out:
|
|
module_put(set->type->me);
|
|
out:
|
|
kfree(set);
|
|
return ret;
|
|
}
|
|
|
|
/* Destroy sets */
|
|
|
|
static const struct nla_policy
|
|
ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = {
|
|
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
|
|
.len = IPSET_MAXNAMELEN - 1 },
|
|
};
|
|
|
|
static void
|
|
ip_set_destroy_set(ip_set_id_t index)
|
|
{
|
|
struct ip_set *set = ip_set_list[index];
|
|
|
|
pr_debug("set: %s\n", set->name);
|
|
ip_set_list[index] = NULL;
|
|
|
|
/* Must call it without holding any lock */
|
|
set->variant->destroy(set);
|
|
module_put(set->type->me);
|
|
kfree(set);
|
|
}
|
|
|
|
static int
|
|
ip_set_destroy(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
ip_set_id_t i;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr)))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
/* Commands are serialized and references are
|
|
* protected by the ip_set_ref_lock.
|
|
* External systems (i.e. xt_set) must call
|
|
* ip_set_put|get_nfnl_* functions, that way we
|
|
* can safely check references here.
|
|
*
|
|
* list:set timer can only decrement the reference
|
|
* counter, so if it's already zero, we can proceed
|
|
* without holding the lock.
|
|
*/
|
|
read_lock_bh(&ip_set_ref_lock);
|
|
if (!attr[IPSET_ATTR_SETNAME]) {
|
|
for (i = 0; i < ip_set_max; i++) {
|
|
if (ip_set_list[i] != NULL && ip_set_list[i]->ref) {
|
|
ret = IPSET_ERR_BUSY;
|
|
goto out;
|
|
}
|
|
}
|
|
read_unlock_bh(&ip_set_ref_lock);
|
|
for (i = 0; i < ip_set_max; i++) {
|
|
if (ip_set_list[i] != NULL)
|
|
ip_set_destroy_set(i);
|
|
}
|
|
} else {
|
|
i = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (i == IPSET_INVALID_ID) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
} else if (ip_set_list[i]->ref) {
|
|
ret = -IPSET_ERR_BUSY;
|
|
goto out;
|
|
}
|
|
read_unlock_bh(&ip_set_ref_lock);
|
|
|
|
ip_set_destroy_set(i);
|
|
}
|
|
return 0;
|
|
out:
|
|
read_unlock_bh(&ip_set_ref_lock);
|
|
return ret;
|
|
}
|
|
|
|
/* Flush sets */
|
|
|
|
static void
|
|
ip_set_flush_set(struct ip_set *set)
|
|
{
|
|
pr_debug("set: %s\n", set->name);
|
|
|
|
write_lock_bh(&set->lock);
|
|
set->variant->flush(set);
|
|
write_unlock_bh(&set->lock);
|
|
}
|
|
|
|
static int
|
|
ip_set_flush(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
ip_set_id_t i;
|
|
|
|
if (unlikely(protocol_failed(attr)))
|
|
return -EPROTO;
|
|
|
|
if (!attr[IPSET_ATTR_SETNAME]) {
|
|
for (i = 0; i < ip_set_max; i++)
|
|
if (ip_set_list[i] != NULL)
|
|
ip_set_flush_set(ip_set_list[i]);
|
|
} else {
|
|
i = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (i == IPSET_INVALID_ID)
|
|
return -ENOENT;
|
|
|
|
ip_set_flush_set(ip_set_list[i]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Rename a set */
|
|
|
|
static const struct nla_policy
|
|
ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = {
|
|
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
|
|
.len = IPSET_MAXNAMELEN - 1 },
|
|
[IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING,
|
|
.len = IPSET_MAXNAMELEN - 1 },
|
|
};
|
|
|
|
static int
|
|
ip_set_rename(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set *set;
|
|
const char *name2;
|
|
ip_set_id_t i;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
attr[IPSET_ATTR_SETNAME] == NULL ||
|
|
attr[IPSET_ATTR_SETNAME2] == NULL))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (set == NULL)
|
|
return -ENOENT;
|
|
|
|
read_lock_bh(&ip_set_ref_lock);
|
|
if (set->ref != 0) {
|
|
ret = -IPSET_ERR_REFERENCED;
|
|
goto out;
|
|
}
|
|
|
|
name2 = nla_data(attr[IPSET_ATTR_SETNAME2]);
|
|
for (i = 0; i < ip_set_max; i++) {
|
|
if (ip_set_list[i] != NULL &&
|
|
STREQ(ip_set_list[i]->name, name2)) {
|
|
ret = -IPSET_ERR_EXIST_SETNAME2;
|
|
goto out;
|
|
}
|
|
}
|
|
strncpy(set->name, name2, IPSET_MAXNAMELEN);
|
|
|
|
out:
|
|
read_unlock_bh(&ip_set_ref_lock);
|
|
return ret;
|
|
}
|
|
|
|
/* Swap two sets so that name/index points to the other.
|
|
* References and set names are also swapped.
|
|
*
|
|
* The commands are serialized by the nfnl mutex and references are
|
|
* protected by the ip_set_ref_lock. The kernel interfaces
|
|
* do not hold the mutex but the pointer settings are atomic
|
|
* so the ip_set_list always contains valid pointers to the sets.
|
|
*/
|
|
|
|
static int
|
|
ip_set_swap(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set *from, *to;
|
|
ip_set_id_t from_id, to_id;
|
|
char from_name[IPSET_MAXNAMELEN];
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
attr[IPSET_ATTR_SETNAME] == NULL ||
|
|
attr[IPSET_ATTR_SETNAME2] == NULL))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
from_id = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (from_id == IPSET_INVALID_ID)
|
|
return -ENOENT;
|
|
|
|
to_id = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME2]));
|
|
if (to_id == IPSET_INVALID_ID)
|
|
return -IPSET_ERR_EXIST_SETNAME2;
|
|
|
|
from = ip_set_list[from_id];
|
|
to = ip_set_list[to_id];
|
|
|
|
/* Features must not change.
|
|
* Not an artificial restriction anymore, as we must prevent
|
|
* possible loops created by swapping in setlist type of sets. */
|
|
if (!(from->type->features == to->type->features &&
|
|
from->type->family == to->type->family))
|
|
return -IPSET_ERR_TYPE_MISMATCH;
|
|
|
|
strncpy(from_name, from->name, IPSET_MAXNAMELEN);
|
|
strncpy(from->name, to->name, IPSET_MAXNAMELEN);
|
|
strncpy(to->name, from_name, IPSET_MAXNAMELEN);
|
|
|
|
write_lock_bh(&ip_set_ref_lock);
|
|
swap(from->ref, to->ref);
|
|
ip_set_list[from_id] = to;
|
|
ip_set_list[to_id] = from;
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* List/save set data */
|
|
|
|
#define DUMP_INIT 0L
|
|
#define DUMP_ALL 1L
|
|
#define DUMP_ONE 2L
|
|
#define DUMP_LAST 3L
|
|
|
|
static int
|
|
ip_set_dump_done(struct netlink_callback *cb)
|
|
{
|
|
if (cb->args[2]) {
|
|
pr_debug("release set %s\n", ip_set_list[cb->args[1]]->name);
|
|
ip_set_put_byindex((ip_set_id_t) cb->args[1]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
dump_attrs(struct nlmsghdr *nlh)
|
|
{
|
|
const struct nlattr *attr;
|
|
int rem;
|
|
|
|
pr_debug("dump nlmsg\n");
|
|
nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) {
|
|
pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len);
|
|
}
|
|
}
|
|
|
|
static int
|
|
dump_init(struct netlink_callback *cb)
|
|
{
|
|
struct nlmsghdr *nlh = nlmsg_hdr(cb->skb);
|
|
int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg));
|
|
struct nlattr *cda[IPSET_ATTR_CMD_MAX+1];
|
|
struct nlattr *attr = (void *)nlh + min_len;
|
|
ip_set_id_t index;
|
|
|
|
/* Second pass, so parser can't fail */
|
|
nla_parse(cda, IPSET_ATTR_CMD_MAX,
|
|
attr, nlh->nlmsg_len - min_len, ip_set_setname_policy);
|
|
|
|
/* cb->args[0] : dump single set/all sets
|
|
* [1] : set index
|
|
* [..]: type specific
|
|
*/
|
|
|
|
if (!cda[IPSET_ATTR_SETNAME]) {
|
|
cb->args[0] = DUMP_ALL;
|
|
return 0;
|
|
}
|
|
|
|
index = find_set_id(nla_data(cda[IPSET_ATTR_SETNAME]));
|
|
if (index == IPSET_INVALID_ID)
|
|
return -ENOENT;
|
|
|
|
cb->args[0] = DUMP_ONE;
|
|
cb->args[1] = index;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
ip_set_id_t index = IPSET_INVALID_ID, max;
|
|
struct ip_set *set = NULL;
|
|
struct nlmsghdr *nlh = NULL;
|
|
unsigned int flags = NETLINK_CB(cb->skb).pid ? NLM_F_MULTI : 0;
|
|
int ret = 0;
|
|
|
|
if (cb->args[0] == DUMP_INIT) {
|
|
ret = dump_init(cb);
|
|
if (ret < 0) {
|
|
nlh = nlmsg_hdr(cb->skb);
|
|
/* We have to create and send the error message
|
|
* manually :-( */
|
|
if (nlh->nlmsg_flags & NLM_F_ACK)
|
|
netlink_ack(cb->skb, nlh, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (cb->args[1] >= ip_set_max)
|
|
goto out;
|
|
|
|
pr_debug("args[0]: %ld args[1]: %ld\n", cb->args[0], cb->args[1]);
|
|
max = cb->args[0] == DUMP_ONE ? cb->args[1] + 1 : ip_set_max;
|
|
for (; cb->args[1] < max; cb->args[1]++) {
|
|
index = (ip_set_id_t) cb->args[1];
|
|
set = ip_set_list[index];
|
|
if (set == NULL) {
|
|
if (cb->args[0] == DUMP_ONE) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
continue;
|
|
}
|
|
/* When dumping all sets, we must dump "sorted"
|
|
* so that lists (unions of sets) are dumped last.
|
|
*/
|
|
if (cb->args[0] != DUMP_ONE &&
|
|
!((cb->args[0] == DUMP_ALL) ^
|
|
(set->type->features & IPSET_DUMP_LAST)))
|
|
continue;
|
|
pr_debug("List set: %s\n", set->name);
|
|
if (!cb->args[2]) {
|
|
/* Start listing: make sure set won't be destroyed */
|
|
pr_debug("reference set\n");
|
|
__ip_set_get(index);
|
|
}
|
|
nlh = start_msg(skb, NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq, flags,
|
|
IPSET_CMD_LIST);
|
|
if (!nlh) {
|
|
ret = -EMSGSIZE;
|
|
goto release_refcount;
|
|
}
|
|
NLA_PUT_U8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL);
|
|
NLA_PUT_STRING(skb, IPSET_ATTR_SETNAME, set->name);
|
|
switch (cb->args[2]) {
|
|
case 0:
|
|
/* Core header data */
|
|
NLA_PUT_STRING(skb, IPSET_ATTR_TYPENAME,
|
|
set->type->name);
|
|
NLA_PUT_U8(skb, IPSET_ATTR_FAMILY,
|
|
set->family);
|
|
NLA_PUT_U8(skb, IPSET_ATTR_REVISION,
|
|
set->type->revision);
|
|
ret = set->variant->head(set, skb);
|
|
if (ret < 0)
|
|
goto release_refcount;
|
|
/* Fall through and add elements */
|
|
default:
|
|
read_lock_bh(&set->lock);
|
|
ret = set->variant->list(set, skb, cb);
|
|
read_unlock_bh(&set->lock);
|
|
if (!cb->args[2]) {
|
|
/* Set is done, proceed with next one */
|
|
if (cb->args[0] == DUMP_ONE)
|
|
cb->args[1] = IPSET_INVALID_ID;
|
|
else
|
|
cb->args[1]++;
|
|
}
|
|
goto release_refcount;
|
|
}
|
|
}
|
|
goto out;
|
|
|
|
nla_put_failure:
|
|
ret = -EFAULT;
|
|
release_refcount:
|
|
/* If there was an error or set is done, release set */
|
|
if (ret || !cb->args[2]) {
|
|
pr_debug("release set %s\n", ip_set_list[index]->name);
|
|
ip_set_put_byindex(index);
|
|
}
|
|
|
|
/* If we dump all sets, continue with dumping last ones */
|
|
if (cb->args[0] == DUMP_ALL && cb->args[1] >= max && !cb->args[2])
|
|
cb->args[0] = DUMP_LAST;
|
|
|
|
out:
|
|
if (nlh) {
|
|
nlmsg_end(skb, nlh);
|
|
pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len);
|
|
dump_attrs(nlh);
|
|
}
|
|
|
|
return ret < 0 ? ret : skb->len;
|
|
}
|
|
|
|
static int
|
|
ip_set_dump(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
if (unlikely(protocol_failed(attr)))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
return netlink_dump_start(ctnl, skb, nlh,
|
|
ip_set_dump_start,
|
|
ip_set_dump_done);
|
|
}
|
|
|
|
/* Add, del and test */
|
|
|
|
static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = {
|
|
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
|
|
.len = IPSET_MAXNAMELEN - 1 },
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_DATA] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_ADT] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int
|
|
call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set,
|
|
struct nlattr *tb[], enum ipset_adt adt,
|
|
u32 flags, bool use_lineno)
|
|
{
|
|
int ret, retried = 0;
|
|
u32 lineno = 0;
|
|
bool eexist = flags & IPSET_FLAG_EXIST;
|
|
|
|
do {
|
|
write_lock_bh(&set->lock);
|
|
ret = set->variant->uadt(set, tb, adt, &lineno, flags);
|
|
write_unlock_bh(&set->lock);
|
|
} while (ret == -EAGAIN &&
|
|
set->variant->resize &&
|
|
(ret = set->variant->resize(set, retried++)) == 0);
|
|
|
|
if (!ret || (ret == -IPSET_ERR_EXIST && eexist))
|
|
return 0;
|
|
if (lineno && use_lineno) {
|
|
/* Error in restore/batch mode: send back lineno */
|
|
struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb);
|
|
struct sk_buff *skb2;
|
|
struct nlmsgerr *errmsg;
|
|
size_t payload = sizeof(*errmsg) + nlmsg_len(nlh);
|
|
int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg));
|
|
struct nlattr *cda[IPSET_ATTR_CMD_MAX+1];
|
|
struct nlattr *cmdattr;
|
|
u32 *errline;
|
|
|
|
skb2 = nlmsg_new(payload, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
rep = __nlmsg_put(skb2, NETLINK_CB(skb).pid,
|
|
nlh->nlmsg_seq, NLMSG_ERROR, payload, 0);
|
|
errmsg = nlmsg_data(rep);
|
|
errmsg->error = ret;
|
|
memcpy(&errmsg->msg, nlh, nlh->nlmsg_len);
|
|
cmdattr = (void *)&errmsg->msg + min_len;
|
|
|
|
nla_parse(cda, IPSET_ATTR_CMD_MAX,
|
|
cmdattr, nlh->nlmsg_len - min_len,
|
|
ip_set_adt_policy);
|
|
|
|
errline = nla_data(cda[IPSET_ATTR_LINENO]);
|
|
|
|
*errline = lineno;
|
|
|
|
netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
/* Signal netlink not to send its ACK/errmsg. */
|
|
return -EINTR;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
ip_set_uadd(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set *set;
|
|
struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {};
|
|
const struct nlattr *nla;
|
|
u32 flags = flag_exist(nlh);
|
|
bool use_lineno;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
attr[IPSET_ATTR_SETNAME] == NULL ||
|
|
!((attr[IPSET_ATTR_DATA] != NULL) ^
|
|
(attr[IPSET_ATTR_ADT] != NULL)) ||
|
|
(attr[IPSET_ATTR_DATA] != NULL &&
|
|
!flag_nested(attr[IPSET_ATTR_DATA])) ||
|
|
(attr[IPSET_ATTR_ADT] != NULL &&
|
|
(!flag_nested(attr[IPSET_ATTR_ADT]) ||
|
|
attr[IPSET_ATTR_LINENO] == NULL))))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (set == NULL)
|
|
return -ENOENT;
|
|
|
|
use_lineno = !!attr[IPSET_ATTR_LINENO];
|
|
if (attr[IPSET_ATTR_DATA]) {
|
|
if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX,
|
|
attr[IPSET_ATTR_DATA],
|
|
set->type->adt_policy))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags,
|
|
use_lineno);
|
|
} else {
|
|
int nla_rem;
|
|
|
|
nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) {
|
|
memset(tb, 0, sizeof(tb));
|
|
if (nla_type(nla) != IPSET_ATTR_DATA ||
|
|
!flag_nested(nla) ||
|
|
nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla,
|
|
set->type->adt_policy))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
ret = call_ad(ctnl, skb, set, tb, IPSET_ADD,
|
|
flags, use_lineno);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
ip_set_udel(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set *set;
|
|
struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {};
|
|
const struct nlattr *nla;
|
|
u32 flags = flag_exist(nlh);
|
|
bool use_lineno;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
attr[IPSET_ATTR_SETNAME] == NULL ||
|
|
!((attr[IPSET_ATTR_DATA] != NULL) ^
|
|
(attr[IPSET_ATTR_ADT] != NULL)) ||
|
|
(attr[IPSET_ATTR_DATA] != NULL &&
|
|
!flag_nested(attr[IPSET_ATTR_DATA])) ||
|
|
(attr[IPSET_ATTR_ADT] != NULL &&
|
|
(!flag_nested(attr[IPSET_ATTR_ADT]) ||
|
|
attr[IPSET_ATTR_LINENO] == NULL))))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (set == NULL)
|
|
return -ENOENT;
|
|
|
|
use_lineno = !!attr[IPSET_ATTR_LINENO];
|
|
if (attr[IPSET_ATTR_DATA]) {
|
|
if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX,
|
|
attr[IPSET_ATTR_DATA],
|
|
set->type->adt_policy))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags,
|
|
use_lineno);
|
|
} else {
|
|
int nla_rem;
|
|
|
|
nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) {
|
|
memset(tb, 0, sizeof(*tb));
|
|
if (nla_type(nla) != IPSET_ATTR_DATA ||
|
|
!flag_nested(nla) ||
|
|
nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla,
|
|
set->type->adt_policy))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
ret = call_ad(ctnl, skb, set, tb, IPSET_DEL,
|
|
flags, use_lineno);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
ip_set_utest(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set *set;
|
|
struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {};
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
attr[IPSET_ATTR_SETNAME] == NULL ||
|
|
attr[IPSET_ATTR_DATA] == NULL ||
|
|
!flag_nested(attr[IPSET_ATTR_DATA])))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (set == NULL)
|
|
return -ENOENT;
|
|
|
|
if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA],
|
|
set->type->adt_policy))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
read_lock_bh(&set->lock);
|
|
ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0);
|
|
read_unlock_bh(&set->lock);
|
|
/* Userspace can't trigger element to be re-added */
|
|
if (ret == -EAGAIN)
|
|
ret = 1;
|
|
|
|
return ret < 0 ? ret : ret > 0 ? 0 : -IPSET_ERR_EXIST;
|
|
}
|
|
|
|
/* Get headed data of a set */
|
|
|
|
static int
|
|
ip_set_header(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
const struct ip_set *set;
|
|
struct sk_buff *skb2;
|
|
struct nlmsghdr *nlh2;
|
|
ip_set_id_t index;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
attr[IPSET_ATTR_SETNAME] == NULL))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
index = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (index == IPSET_INVALID_ID)
|
|
return -ENOENT;
|
|
set = ip_set_list[index];
|
|
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0,
|
|
IPSET_CMD_HEADER);
|
|
if (!nlh2)
|
|
goto nlmsg_failure;
|
|
NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL);
|
|
NLA_PUT_STRING(skb2, IPSET_ATTR_SETNAME, set->name);
|
|
NLA_PUT_STRING(skb2, IPSET_ATTR_TYPENAME, set->type->name);
|
|
NLA_PUT_U8(skb2, IPSET_ATTR_FAMILY, set->family);
|
|
NLA_PUT_U8(skb2, IPSET_ATTR_REVISION, set->type->revision);
|
|
nlmsg_end(skb2, nlh2);
|
|
|
|
ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb2, nlh2);
|
|
nlmsg_failure:
|
|
kfree_skb(skb2);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* Get type data */
|
|
|
|
static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = {
|
|
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING,
|
|
.len = IPSET_MAXNAMELEN - 1 },
|
|
[IPSET_ATTR_FAMILY] = { .type = NLA_U8 },
|
|
};
|
|
|
|
static int
|
|
ip_set_type(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct sk_buff *skb2;
|
|
struct nlmsghdr *nlh2;
|
|
u8 family, min, max;
|
|
const char *typename;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
attr[IPSET_ATTR_TYPENAME] == NULL ||
|
|
attr[IPSET_ATTR_FAMILY] == NULL))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
family = nla_get_u8(attr[IPSET_ATTR_FAMILY]);
|
|
typename = nla_data(attr[IPSET_ATTR_TYPENAME]);
|
|
ret = find_set_type_minmax(typename, family, &min, &max);
|
|
if (ret)
|
|
return ret;
|
|
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0,
|
|
IPSET_CMD_TYPE);
|
|
if (!nlh2)
|
|
goto nlmsg_failure;
|
|
NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL);
|
|
NLA_PUT_STRING(skb2, IPSET_ATTR_TYPENAME, typename);
|
|
NLA_PUT_U8(skb2, IPSET_ATTR_FAMILY, family);
|
|
NLA_PUT_U8(skb2, IPSET_ATTR_REVISION, max);
|
|
NLA_PUT_U8(skb2, IPSET_ATTR_REVISION_MIN, min);
|
|
nlmsg_end(skb2, nlh2);
|
|
|
|
pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len);
|
|
ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb2, nlh2);
|
|
nlmsg_failure:
|
|
kfree_skb(skb2);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* Get protocol version */
|
|
|
|
static const struct nla_policy
|
|
ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = {
|
|
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
|
|
};
|
|
|
|
static int
|
|
ip_set_protocol(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct sk_buff *skb2;
|
|
struct nlmsghdr *nlh2;
|
|
int ret = 0;
|
|
|
|
if (unlikely(attr[IPSET_ATTR_PROTOCOL] == NULL))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0,
|
|
IPSET_CMD_PROTOCOL);
|
|
if (!nlh2)
|
|
goto nlmsg_failure;
|
|
NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL);
|
|
nlmsg_end(skb2, nlh2);
|
|
|
|
ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb2, nlh2);
|
|
nlmsg_failure:
|
|
kfree_skb(skb2);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = {
|
|
[IPSET_CMD_CREATE] = {
|
|
.call = ip_set_create,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_create_policy,
|
|
},
|
|
[IPSET_CMD_DESTROY] = {
|
|
.call = ip_set_destroy,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_setname_policy,
|
|
},
|
|
[IPSET_CMD_FLUSH] = {
|
|
.call = ip_set_flush,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_setname_policy,
|
|
},
|
|
[IPSET_CMD_RENAME] = {
|
|
.call = ip_set_rename,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_setname2_policy,
|
|
},
|
|
[IPSET_CMD_SWAP] = {
|
|
.call = ip_set_swap,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_setname2_policy,
|
|
},
|
|
[IPSET_CMD_LIST] = {
|
|
.call = ip_set_dump,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_setname_policy,
|
|
},
|
|
[IPSET_CMD_SAVE] = {
|
|
.call = ip_set_dump,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_setname_policy,
|
|
},
|
|
[IPSET_CMD_ADD] = {
|
|
.call = ip_set_uadd,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_adt_policy,
|
|
},
|
|
[IPSET_CMD_DEL] = {
|
|
.call = ip_set_udel,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_adt_policy,
|
|
},
|
|
[IPSET_CMD_TEST] = {
|
|
.call = ip_set_utest,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_adt_policy,
|
|
},
|
|
[IPSET_CMD_HEADER] = {
|
|
.call = ip_set_header,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_setname_policy,
|
|
},
|
|
[IPSET_CMD_TYPE] = {
|
|
.call = ip_set_type,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_type_policy,
|
|
},
|
|
[IPSET_CMD_PROTOCOL] = {
|
|
.call = ip_set_protocol,
|
|
.attr_count = IPSET_ATTR_CMD_MAX,
|
|
.policy = ip_set_protocol_policy,
|
|
},
|
|
};
|
|
|
|
static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = {
|
|
.name = "ip_set",
|
|
.subsys_id = NFNL_SUBSYS_IPSET,
|
|
.cb_count = IPSET_MSG_MAX,
|
|
.cb = ip_set_netlink_subsys_cb,
|
|
};
|
|
|
|
/* Interface to iptables/ip6tables */
|
|
|
|
static int
|
|
ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
|
|
{
|
|
unsigned *op;
|
|
void *data;
|
|
int copylen = *len, ret = 0;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
if (optval != SO_IP_SET)
|
|
return -EBADF;
|
|
if (*len < sizeof(unsigned))
|
|
return -EINVAL;
|
|
|
|
data = vmalloc(*len);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
if (copy_from_user(data, user, *len) != 0) {
|
|
ret = -EFAULT;
|
|
goto done;
|
|
}
|
|
op = (unsigned *) data;
|
|
|
|
if (*op < IP_SET_OP_VERSION) {
|
|
/* Check the version at the beginning of operations */
|
|
struct ip_set_req_version *req_version = data;
|
|
if (req_version->version != IPSET_PROTOCOL) {
|
|
ret = -EPROTO;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
switch (*op) {
|
|
case IP_SET_OP_VERSION: {
|
|
struct ip_set_req_version *req_version = data;
|
|
|
|
if (*len != sizeof(struct ip_set_req_version)) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
req_version->version = IPSET_PROTOCOL;
|
|
ret = copy_to_user(user, req_version,
|
|
sizeof(struct ip_set_req_version));
|
|
goto done;
|
|
}
|
|
case IP_SET_OP_GET_BYNAME: {
|
|
struct ip_set_req_get_set *req_get = data;
|
|
|
|
if (*len != sizeof(struct ip_set_req_get_set)) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0';
|
|
nfnl_lock();
|
|
req_get->set.index = find_set_id(req_get->set.name);
|
|
nfnl_unlock();
|
|
goto copy;
|
|
}
|
|
case IP_SET_OP_GET_BYINDEX: {
|
|
struct ip_set_req_get_set *req_get = data;
|
|
|
|
if (*len != sizeof(struct ip_set_req_get_set) ||
|
|
req_get->set.index >= ip_set_max) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
nfnl_lock();
|
|
strncpy(req_get->set.name,
|
|
ip_set_list[req_get->set.index]
|
|
? ip_set_list[req_get->set.index]->name : "",
|
|
IPSET_MAXNAMELEN);
|
|
nfnl_unlock();
|
|
goto copy;
|
|
}
|
|
default:
|
|
ret = -EBADMSG;
|
|
goto done;
|
|
} /* end of switch(op) */
|
|
|
|
copy:
|
|
ret = copy_to_user(user, data, copylen);
|
|
|
|
done:
|
|
vfree(data);
|
|
if (ret > 0)
|
|
ret = 0;
|
|
return ret;
|
|
}
|
|
|
|
static struct nf_sockopt_ops so_set __read_mostly = {
|
|
.pf = PF_INET,
|
|
.get_optmin = SO_IP_SET,
|
|
.get_optmax = SO_IP_SET + 1,
|
|
.get = &ip_set_sockfn_get,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init
|
|
ip_set_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (max_sets)
|
|
ip_set_max = max_sets;
|
|
if (ip_set_max >= IPSET_INVALID_ID)
|
|
ip_set_max = IPSET_INVALID_ID - 1;
|
|
|
|
ip_set_list = kzalloc(sizeof(struct ip_set *) * ip_set_max,
|
|
GFP_KERNEL);
|
|
if (!ip_set_list) {
|
|
pr_err("ip_set: Unable to create ip_set_list\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = nfnetlink_subsys_register(&ip_set_netlink_subsys);
|
|
if (ret != 0) {
|
|
pr_err("ip_set: cannot register with nfnetlink.\n");
|
|
kfree(ip_set_list);
|
|
return ret;
|
|
}
|
|
ret = nf_register_sockopt(&so_set);
|
|
if (ret != 0) {
|
|
pr_err("SO_SET registry failed: %d\n", ret);
|
|
nfnetlink_subsys_unregister(&ip_set_netlink_subsys);
|
|
kfree(ip_set_list);
|
|
return ret;
|
|
}
|
|
|
|
pr_notice("ip_set: protocol %u\n", IPSET_PROTOCOL);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
ip_set_fini(void)
|
|
{
|
|
/* There can't be any existing set */
|
|
nf_unregister_sockopt(&so_set);
|
|
nfnetlink_subsys_unregister(&ip_set_netlink_subsys);
|
|
kfree(ip_set_list);
|
|
pr_debug("these are the famous last words\n");
|
|
}
|
|
|
|
module_init(ip_set_init);
|
|
module_exit(ip_set_fini);
|