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![Vishwanath Pai](/assets/img/avatar_default.png)
This fix adds a new reference counter (ref_netlink) for the struct ip_set. The other reference counter (ref) can be swapped out by ip_set_swap and we need a separate counter to keep track of references for netlink events like dump. Using the same ref counter for dump causes a race condition which can be demonstrated by the following script: ipset create hash_ip1 hash:ip family inet hashsize 1024 maxelem 500000 \ counters ipset create hash_ip2 hash:ip family inet hashsize 300000 maxelem 500000 \ counters ipset create hash_ip3 hash:ip family inet hashsize 1024 maxelem 500000 \ counters ipset save & ipset swap hash_ip3 hash_ip2 ipset destroy hash_ip3 /* will crash the machine */ Swap will exchange the values of ref so destroy will see ref = 0 instead of ref = 1. With this fix in place swap will not succeed because ipset save still has ref_netlink on the set (ip_set_swap doesn't swap ref_netlink). Both delete and swap will error out if ref_netlink != 0 on the set. Note: The changes to *_head functions is because previously we would increment ref whenever we called these functions, we don't do that anymore. Reviewed-by: Joshua Hunt <johunt@akamai.com> Signed-off-by: Vishwanath Pai <vpai@akamai.com> Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2102 lines
54 KiB
C
2102 lines
54 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) 2003-2013 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/rculist.h>
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#include <net/netlink.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/x_tables.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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struct ip_set_net {
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struct ip_set * __rcu *ip_set_list; /* all individual sets */
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ip_set_id_t ip_set_max; /* max number of sets */
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bool is_deleted; /* deleted by ip_set_net_exit */
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bool is_destroyed; /* all sets are destroyed */
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};
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static int ip_set_net_id __read_mostly;
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static inline struct ip_set_net *ip_set_pernet(struct net *net)
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{
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return net_generic(net, ip_set_net_id);
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}
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#define IP_SET_INC 64
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#define STRNCMP(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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/* When the nfnl mutex is held: */
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#define ip_set_dereference(p) \
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rcu_dereference_protected(p, 1)
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#define ip_set(inst, id) \
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ip_set_dereference((inst)->ip_set_list)[id]
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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 (STRNCMP(type->name, name) &&
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(type->family == family ||
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type->family == NFPROTO_UNSPEC) &&
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revision >= type->revision_min &&
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revision <= type->revision_max)
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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 bool
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load_settype(const char *name)
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{
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nfnl_unlock(NFNL_SUBSYS_IPSET);
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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_warn("Can't find ip_set type %s\n", name);
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nfnl_lock(NFNL_SUBSYS_IPSET);
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return false;
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}
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nfnl_lock(NFNL_SUBSYS_IPSET);
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return true;
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}
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/* Find a set type and reference it */
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#define find_set_type_get(name, family, revision, found) \
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__find_set_type_get(name, family, revision, found, false)
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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, bool retry)
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{
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struct ip_set_type *type;
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int err;
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if (retry && !load_settype(name))
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return -IPSET_ERR_FIND_TYPE;
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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 already loaded
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* but we don't support the revision
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*/
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list_for_each_entry_rcu(type, &ip_set_type_list, list)
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if (STRNCMP(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 retry ? -IPSET_ERR_FIND_TYPE :
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__find_set_type_get(name, family, revision, found, true);
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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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#define find_set_type_minmax(name, family, min, max) \
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__find_set_type_minmax(name, family, min, max, false)
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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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bool retry)
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{
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struct ip_set_type *type;
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bool found = false;
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if (retry && !load_settype(name))
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return -IPSET_ERR_FIND_TYPE;
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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 (STRNCMP(type->name, name) &&
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(type->family == family ||
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type->family == NFPROTO_UNSPEC)) {
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found = true;
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if (type->revision_min < *min)
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*min = type->revision_min;
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if (type->revision_max > *max)
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*max = type->revision_max;
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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 retry ? -IPSET_ERR_FIND_TYPE :
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__find_set_type_minmax(name, family, min, max, true);
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}
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#define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \
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(f) == NFPROTO_IPV6 ? "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_warn("ip_set type %s, family %s, revision %u:%u uses wrong protocol version %u (want %u)\n",
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type->name, family_name(type->family),
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type->revision_min, type->revision_max,
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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_min)) {
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/* Duplicate! */
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pr_warn("ip_set type %s, family %s with revision min %u already registered!\n",
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type->name, family_name(type->family),
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type->revision_min);
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ip_set_type_unlock();
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return -EINVAL;
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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:%u registered.\n",
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type->name, family_name(type->family),
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type->revision_min, type->revision_max);
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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_min)) {
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pr_warn("ip_set type %s, family %s with revision min %u not registered\n",
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type->name, family_name(type->family),
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type->revision_min);
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ip_set_type_unlock();
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return;
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}
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list_del_rcu(&type->list);
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pr_debug("type %s, family %s with revision min %u unregistered.\n",
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type->name, family_name(type->family), type->revision_min);
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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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kvfree(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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typedef void (*destroyer)(void *);
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/* ipset data extension types, in size order */
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const struct ip_set_ext_type ip_set_extensions[] = {
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[IPSET_EXT_ID_COUNTER] = {
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.type = IPSET_EXT_COUNTER,
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.flag = IPSET_FLAG_WITH_COUNTERS,
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.len = sizeof(struct ip_set_counter),
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.align = __alignof__(struct ip_set_counter),
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},
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[IPSET_EXT_ID_TIMEOUT] = {
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.type = IPSET_EXT_TIMEOUT,
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.len = sizeof(unsigned long),
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.align = __alignof__(unsigned long),
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},
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[IPSET_EXT_ID_SKBINFO] = {
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.type = IPSET_EXT_SKBINFO,
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.flag = IPSET_FLAG_WITH_SKBINFO,
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.len = sizeof(struct ip_set_skbinfo),
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.align = __alignof__(struct ip_set_skbinfo),
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},
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[IPSET_EXT_ID_COMMENT] = {
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.type = IPSET_EXT_COMMENT | IPSET_EXT_DESTROY,
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.flag = IPSET_FLAG_WITH_COMMENT,
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.len = sizeof(struct ip_set_comment),
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.align = __alignof__(struct ip_set_comment),
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.destroy = (destroyer) ip_set_comment_free,
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},
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};
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EXPORT_SYMBOL_GPL(ip_set_extensions);
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static inline bool
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add_extension(enum ip_set_ext_id id, u32 flags, struct nlattr *tb[])
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{
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return ip_set_extensions[id].flag ?
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(flags & ip_set_extensions[id].flag) :
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!!tb[IPSET_ATTR_TIMEOUT];
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}
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size_t
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ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len,
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size_t align)
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{
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enum ip_set_ext_id id;
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u32 cadt_flags = 0;
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if (tb[IPSET_ATTR_CADT_FLAGS])
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cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
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if (cadt_flags & IPSET_FLAG_WITH_FORCEADD)
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set->flags |= IPSET_CREATE_FLAG_FORCEADD;
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if (!align)
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align = 1;
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for (id = 0; id < IPSET_EXT_ID_MAX; id++) {
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if (!add_extension(id, cadt_flags, tb))
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continue;
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len = ALIGN(len, ip_set_extensions[id].align);
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set->offset[id] = len;
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set->extensions |= ip_set_extensions[id].type;
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len += ip_set_extensions[id].len;
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}
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return ALIGN(len, align);
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}
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EXPORT_SYMBOL_GPL(ip_set_elem_len);
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int
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ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[],
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struct ip_set_ext *ext)
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{
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u64 fullmark;
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if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
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return -IPSET_ERR_PROTOCOL;
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if (tb[IPSET_ATTR_TIMEOUT]) {
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if (!SET_WITH_TIMEOUT(set))
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return -IPSET_ERR_TIMEOUT;
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ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
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}
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if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) {
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if (!SET_WITH_COUNTER(set))
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return -IPSET_ERR_COUNTER;
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if (tb[IPSET_ATTR_BYTES])
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ext->bytes = be64_to_cpu(nla_get_be64(
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tb[IPSET_ATTR_BYTES]));
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if (tb[IPSET_ATTR_PACKETS])
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ext->packets = be64_to_cpu(nla_get_be64(
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tb[IPSET_ATTR_PACKETS]));
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}
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if (tb[IPSET_ATTR_COMMENT]) {
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if (!SET_WITH_COMMENT(set))
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return -IPSET_ERR_COMMENT;
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ext->comment = ip_set_comment_uget(tb[IPSET_ATTR_COMMENT]);
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}
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if (tb[IPSET_ATTR_SKBMARK]) {
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if (!SET_WITH_SKBINFO(set))
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return -IPSET_ERR_SKBINFO;
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fullmark = be64_to_cpu(nla_get_be64(tb[IPSET_ATTR_SKBMARK]));
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ext->skbmark = fullmark >> 32;
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ext->skbmarkmask = fullmark & 0xffffffff;
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}
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if (tb[IPSET_ATTR_SKBPRIO]) {
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if (!SET_WITH_SKBINFO(set))
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return -IPSET_ERR_SKBINFO;
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ext->skbprio = be32_to_cpu(nla_get_be32(
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tb[IPSET_ATTR_SKBPRIO]));
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}
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if (tb[IPSET_ATTR_SKBQUEUE]) {
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if (!SET_WITH_SKBINFO(set))
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return -IPSET_ERR_SKBINFO;
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ext->skbqueue = be16_to_cpu(nla_get_be16(
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tb[IPSET_ATTR_SKBQUEUE]));
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(ip_set_get_extensions);
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|
|
int
|
|
ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set,
|
|
const void *e, bool active)
|
|
{
|
|
if (SET_WITH_TIMEOUT(set)) {
|
|
unsigned long *timeout = ext_timeout(e, set);
|
|
|
|
if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
|
|
htonl(active ? ip_set_timeout_get(timeout)
|
|
: *timeout)))
|
|
return -EMSGSIZE;
|
|
}
|
|
if (SET_WITH_COUNTER(set) &&
|
|
ip_set_put_counter(skb, ext_counter(e, set)))
|
|
return -EMSGSIZE;
|
|
if (SET_WITH_COMMENT(set) &&
|
|
ip_set_put_comment(skb, ext_comment(e, set)))
|
|
return -EMSGSIZE;
|
|
if (SET_WITH_SKBINFO(set) &&
|
|
ip_set_put_skbinfo(skb, ext_skbinfo(e, set)))
|
|
return -EMSGSIZE;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_put_extensions);
|
|
|
|
/* Creating/destroying/renaming/swapping affect the existence and
|
|
* the properties of a set. All of these can be executed from userspace
|
|
* only and serialized by the nfnl mutex indirectly from nfnetlink.
|
|
*
|
|
* Sets are identified by their index in ip_set_list and the index
|
|
* is used by the external references (set/SET netfilter modules).
|
|
*
|
|
* The set behind an index may change by swapping only, from userspace.
|
|
*/
|
|
|
|
static inline void
|
|
__ip_set_get(struct ip_set *set)
|
|
{
|
|
write_lock_bh(&ip_set_ref_lock);
|
|
set->ref++;
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
}
|
|
|
|
static inline void
|
|
__ip_set_put(struct ip_set *set)
|
|
{
|
|
write_lock_bh(&ip_set_ref_lock);
|
|
BUG_ON(set->ref == 0);
|
|
set->ref--;
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
}
|
|
|
|
/* set->ref can be swapped out by ip_set_swap, netlink events (like dump) need
|
|
* a separate reference counter
|
|
*/
|
|
static inline void
|
|
__ip_set_get_netlink(struct ip_set *set)
|
|
{
|
|
write_lock_bh(&ip_set_ref_lock);
|
|
set->ref_netlink++;
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
}
|
|
|
|
static inline void
|
|
__ip_set_put_netlink(struct ip_set *set)
|
|
{
|
|
write_lock_bh(&ip_set_ref_lock);
|
|
BUG_ON(set->ref_netlink == 0);
|
|
set->ref_netlink--;
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
}
|
|
|
|
/* Add, del and test set entries from kernel.
|
|
*
|
|
* The set behind the index must exist and must be referenced
|
|
* so it can't be destroyed (or changed) under our foot.
|
|
*/
|
|
|
|
static inline struct ip_set *
|
|
ip_set_rcu_get(struct net *net, ip_set_id_t index)
|
|
{
|
|
struct ip_set *set;
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
|
|
rcu_read_lock();
|
|
/* ip_set_list itself needs to be protected */
|
|
set = rcu_dereference(inst->ip_set_list)[index];
|
|
rcu_read_unlock();
|
|
|
|
return set;
|
|
}
|
|
|
|
int
|
|
ip_set_test(ip_set_id_t index, const struct sk_buff *skb,
|
|
const struct xt_action_param *par, struct ip_set_adt_opt *opt)
|
|
{
|
|
struct ip_set *set = ip_set_rcu_get(par->net, index);
|
|
int ret = 0;
|
|
|
|
BUG_ON(!set);
|
|
pr_debug("set %s, index %u\n", set->name, index);
|
|
|
|
if (opt->dim < set->type->dimension ||
|
|
!(opt->family == set->family || set->family == NFPROTO_UNSPEC))
|
|
return 0;
|
|
|
|
rcu_read_lock_bh();
|
|
ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt);
|
|
rcu_read_unlock_bh();
|
|
|
|
if (ret == -EAGAIN) {
|
|
/* Type requests element to be completed */
|
|
pr_debug("element must be completed, ADD is triggered\n");
|
|
spin_lock_bh(&set->lock);
|
|
set->variant->kadt(set, skb, par, IPSET_ADD, opt);
|
|
spin_unlock_bh(&set->lock);
|
|
ret = 1;
|
|
} else {
|
|
/* --return-nomatch: invert matched element */
|
|
if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) &&
|
|
(set->type->features & IPSET_TYPE_NOMATCH) &&
|
|
(ret > 0 || ret == -ENOTEMPTY))
|
|
ret = -ret;
|
|
}
|
|
|
|
/* Convert error codes to nomatch */
|
|
return (ret < 0 ? 0 : ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_test);
|
|
|
|
int
|
|
ip_set_add(ip_set_id_t index, const struct sk_buff *skb,
|
|
const struct xt_action_param *par, struct ip_set_adt_opt *opt)
|
|
{
|
|
struct ip_set *set = ip_set_rcu_get(par->net, index);
|
|
int ret;
|
|
|
|
BUG_ON(!set);
|
|
pr_debug("set %s, index %u\n", set->name, index);
|
|
|
|
if (opt->dim < set->type->dimension ||
|
|
!(opt->family == set->family || set->family == NFPROTO_UNSPEC))
|
|
return -IPSET_ERR_TYPE_MISMATCH;
|
|
|
|
spin_lock_bh(&set->lock);
|
|
ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt);
|
|
spin_unlock_bh(&set->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_add);
|
|
|
|
int
|
|
ip_set_del(ip_set_id_t index, const struct sk_buff *skb,
|
|
const struct xt_action_param *par, struct ip_set_adt_opt *opt)
|
|
{
|
|
struct ip_set *set = ip_set_rcu_get(par->net, index);
|
|
int ret = 0;
|
|
|
|
BUG_ON(!set);
|
|
pr_debug("set %s, index %u\n", set->name, index);
|
|
|
|
if (opt->dim < set->type->dimension ||
|
|
!(opt->family == set->family || set->family == NFPROTO_UNSPEC))
|
|
return -IPSET_ERR_TYPE_MISMATCH;
|
|
|
|
spin_lock_bh(&set->lock);
|
|
ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt);
|
|
spin_unlock_bh(&set->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_del);
|
|
|
|
/* Find set by name, reference it once. The reference makes sure the
|
|
* thing pointed to, does not go away under our feet.
|
|
*
|
|
*/
|
|
ip_set_id_t
|
|
ip_set_get_byname(struct net *net, const char *name, struct ip_set **set)
|
|
{
|
|
ip_set_id_t i, index = IPSET_INVALID_ID;
|
|
struct ip_set *s;
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
|
|
rcu_read_lock();
|
|
for (i = 0; i < inst->ip_set_max; i++) {
|
|
s = rcu_dereference(inst->ip_set_list)[i];
|
|
if (s && STRNCMP(s->name, name)) {
|
|
__ip_set_get(s);
|
|
index = i;
|
|
*set = s;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return index;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_get_byname);
|
|
|
|
/* If the given set pointer points to a valid set, decrement
|
|
* reference count by 1. The caller shall not assume the index
|
|
* to be valid, after calling this function.
|
|
*
|
|
*/
|
|
|
|
static inline void
|
|
__ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index)
|
|
{
|
|
struct ip_set *set;
|
|
|
|
rcu_read_lock();
|
|
set = rcu_dereference(inst->ip_set_list)[index];
|
|
if (set)
|
|
__ip_set_put(set);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
void
|
|
ip_set_put_byindex(struct net *net, ip_set_id_t index)
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
|
|
__ip_set_put_byindex(inst, index);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_put_byindex);
|
|
|
|
/* Get the name of a set behind a set index.
|
|
* We assume the set is referenced, so it does exist and
|
|
* can't be destroyed. The set cannot be renamed due to
|
|
* the referencing either.
|
|
*
|
|
*/
|
|
const char *
|
|
ip_set_name_byindex(struct net *net, ip_set_id_t index)
|
|
{
|
|
const struct ip_set *set = ip_set_rcu_get(net, index);
|
|
|
|
BUG_ON(!set);
|
|
BUG_ON(set->ref == 0);
|
|
|
|
/* Referenced, so it's safe */
|
|
return set->name;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_name_byindex);
|
|
|
|
/* Routines to call by external subsystems, which do not
|
|
* call nfnl_lock for us.
|
|
*/
|
|
|
|
/* Find set by index, reference it once. The reference makes sure the
|
|
* thing pointed to, does not go away under our feet.
|
|
*
|
|
* The nfnl mutex is used in the function.
|
|
*/
|
|
ip_set_id_t
|
|
ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index)
|
|
{
|
|
struct ip_set *set;
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
|
|
if (index >= inst->ip_set_max)
|
|
return IPSET_INVALID_ID;
|
|
|
|
nfnl_lock(NFNL_SUBSYS_IPSET);
|
|
set = ip_set(inst, index);
|
|
if (set)
|
|
__ip_set_get(set);
|
|
else
|
|
index = IPSET_INVALID_ID;
|
|
nfnl_unlock(NFNL_SUBSYS_IPSET);
|
|
|
|
return index;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex);
|
|
|
|
/* If the given set pointer points to a valid set, decrement
|
|
* reference count by 1. The caller shall not assume the index
|
|
* to be valid, after calling this function.
|
|
*
|
|
* The nfnl mutex is used in the function.
|
|
*/
|
|
void
|
|
ip_set_nfnl_put(struct net *net, ip_set_id_t index)
|
|
{
|
|
struct ip_set *set;
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
|
|
nfnl_lock(NFNL_SUBSYS_IPSET);
|
|
if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */
|
|
set = ip_set(inst, index);
|
|
if (set)
|
|
__ip_set_put(set);
|
|
}
|
|
nfnl_unlock(NFNL_SUBSYS_IPSET);
|
|
}
|
|
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 portid, u32 seq, unsigned int flags,
|
|
enum ipset_cmd cmd)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, cmd | (NFNL_SUBSYS_IPSET << 8),
|
|
sizeof(*nfmsg), flags);
|
|
if (!nlh)
|
|
return NULL;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = NFPROTO_IPV4;
|
|
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 struct ip_set *
|
|
find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id)
|
|
{
|
|
struct ip_set *set = NULL;
|
|
ip_set_id_t i;
|
|
|
|
*id = IPSET_INVALID_ID;
|
|
for (i = 0; i < inst->ip_set_max; i++) {
|
|
set = ip_set(inst, i);
|
|
if (set && STRNCMP(set->name, name)) {
|
|
*id = i;
|
|
break;
|
|
}
|
|
}
|
|
return (*id == IPSET_INVALID_ID ? NULL : set);
|
|
}
|
|
|
|
static inline struct ip_set *
|
|
find_set(struct ip_set_net *inst, const char *name)
|
|
{
|
|
ip_set_id_t id;
|
|
|
|
return find_set_and_id(inst, name, &id);
|
|
}
|
|
|
|
static int
|
|
find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index,
|
|
struct ip_set **set)
|
|
{
|
|
struct ip_set *s;
|
|
ip_set_id_t i;
|
|
|
|
*index = IPSET_INVALID_ID;
|
|
for (i = 0; i < inst->ip_set_max; i++) {
|
|
s = ip_set(inst, i);
|
|
if (!s) {
|
|
if (*index == IPSET_INVALID_ID)
|
|
*index = i;
|
|
} else if (STRNCMP(name, s->name)) {
|
|
/* Name clash */
|
|
*set = s;
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
if (*index == IPSET_INVALID_ID)
|
|
/* No free slot remained */
|
|
return -IPSET_ERR_MAX_SETS;
|
|
return 0;
|
|
}
|
|
|
|
static int ip_set_none(struct net *net, struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int ip_set_create(struct net *net, struct sock *ctnl,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
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] ||
|
|
!attr[IPSET_ATTR_TYPENAME] ||
|
|
!attr[IPSET_ATTR_REVISION] ||
|
|
!attr[IPSET_ATTR_FAMILY] ||
|
|
(attr[IPSET_ATTR_DATA] &&
|
|
!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(*set), GFP_KERNEL);
|
|
if (!set)
|
|
return -ENOMEM;
|
|
spin_lock_init(&set->lock);
|
|
strlcpy(set->name, name, IPSET_MAXNAMELEN);
|
|
set->family = family;
|
|
set->revision = revision;
|
|
|
|
/* 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(net, 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.
|
|
*/
|
|
ret = find_free_id(inst, set->name, &index, &clash);
|
|
if (ret == -EEXIST) {
|
|
/* If this is the same set and requested, ignore error */
|
|
if ((flags & IPSET_FLAG_EXIST) &&
|
|
STRNCMP(set->type->name, clash->type->name) &&
|
|
set->type->family == clash->type->family &&
|
|
set->type->revision_min == clash->type->revision_min &&
|
|
set->type->revision_max == clash->type->revision_max &&
|
|
set->variant->same_set(set, clash))
|
|
ret = 0;
|
|
goto cleanup;
|
|
} else if (ret == -IPSET_ERR_MAX_SETS) {
|
|
struct ip_set **list, **tmp;
|
|
ip_set_id_t i = inst->ip_set_max + IP_SET_INC;
|
|
|
|
if (i < inst->ip_set_max || i == IPSET_INVALID_ID)
|
|
/* Wraparound */
|
|
goto cleanup;
|
|
|
|
list = kcalloc(i, sizeof(struct ip_set *), GFP_KERNEL);
|
|
if (!list)
|
|
goto cleanup;
|
|
/* nfnl mutex is held, both lists are valid */
|
|
tmp = ip_set_dereference(inst->ip_set_list);
|
|
memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max);
|
|
rcu_assign_pointer(inst->ip_set_list, list);
|
|
/* Make sure all current packets have passed through */
|
|
synchronize_net();
|
|
/* Use new list */
|
|
index = inst->ip_set_max;
|
|
inst->ip_set_max = i;
|
|
kfree(tmp);
|
|
ret = 0;
|
|
} else if (ret) {
|
|
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(inst, 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(struct ip_set *set)
|
|
{
|
|
pr_debug("set: %s\n", set->name);
|
|
|
|
/* Must call it without holding any lock */
|
|
set->variant->destroy(set);
|
|
module_put(set->type->me);
|
|
kfree(set);
|
|
}
|
|
|
|
static int ip_set_destroy(struct net *net, struct sock *ctnl,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
struct ip_set *s;
|
|
ip_set_id_t i;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr)))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
/* Must wait for flush to be really finished in list:set */
|
|
rcu_barrier();
|
|
|
|
/* 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 < inst->ip_set_max; i++) {
|
|
s = ip_set(inst, i);
|
|
if (s && (s->ref || s->ref_netlink)) {
|
|
ret = -IPSET_ERR_BUSY;
|
|
goto out;
|
|
}
|
|
}
|
|
inst->is_destroyed = true;
|
|
read_unlock_bh(&ip_set_ref_lock);
|
|
for (i = 0; i < inst->ip_set_max; i++) {
|
|
s = ip_set(inst, i);
|
|
if (s) {
|
|
ip_set(inst, i) = NULL;
|
|
ip_set_destroy_set(s);
|
|
}
|
|
}
|
|
/* Modified by ip_set_destroy() only, which is serialized */
|
|
inst->is_destroyed = false;
|
|
} else {
|
|
s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]),
|
|
&i);
|
|
if (!s) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
} else if (s->ref || s->ref_netlink) {
|
|
ret = -IPSET_ERR_BUSY;
|
|
goto out;
|
|
}
|
|
ip_set(inst, i) = NULL;
|
|
read_unlock_bh(&ip_set_ref_lock);
|
|
|
|
ip_set_destroy_set(s);
|
|
}
|
|
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);
|
|
|
|
spin_lock_bh(&set->lock);
|
|
set->variant->flush(set);
|
|
spin_unlock_bh(&set->lock);
|
|
}
|
|
|
|
static int ip_set_flush(struct net *net, struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
struct ip_set *s;
|
|
ip_set_id_t i;
|
|
|
|
if (unlikely(protocol_failed(attr)))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
if (!attr[IPSET_ATTR_SETNAME]) {
|
|
for (i = 0; i < inst->ip_set_max; i++) {
|
|
s = ip_set(inst, i);
|
|
if (s)
|
|
ip_set_flush_set(s);
|
|
}
|
|
} else {
|
|
s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (!s)
|
|
return -ENOENT;
|
|
|
|
ip_set_flush_set(s);
|
|
}
|
|
|
|
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 net *net, struct sock *ctnl,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
struct ip_set *set, *s;
|
|
const char *name2;
|
|
ip_set_id_t i;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
!attr[IPSET_ATTR_SETNAME] ||
|
|
!attr[IPSET_ATTR_SETNAME2]))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (!set)
|
|
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 < inst->ip_set_max; i++) {
|
|
s = ip_set(inst, i);
|
|
if (s && STRNCMP(s->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 net *net, struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
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] ||
|
|
!attr[IPSET_ATTR_SETNAME2]))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]),
|
|
&from_id);
|
|
if (!from)
|
|
return -ENOENT;
|
|
|
|
to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]),
|
|
&to_id);
|
|
if (!to)
|
|
return -IPSET_ERR_EXIST_SETNAME2;
|
|
|
|
/* Features must not change.
|
|
* Not an artifical restriction anymore, as we must prevent
|
|
* possible loops created by swapping in setlist type of sets.
|
|
*/
|
|
if (!(from->type->features == to->type->features &&
|
|
from->family == to->family))
|
|
return -IPSET_ERR_TYPE_MISMATCH;
|
|
|
|
if (from->ref_netlink || to->ref_netlink)
|
|
return -EBUSY;
|
|
|
|
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(inst, from_id) = to;
|
|
ip_set(inst, to_id) = from;
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* List/save set data */
|
|
|
|
#define DUMP_INIT 0
|
|
#define DUMP_ALL 1
|
|
#define DUMP_ONE 2
|
|
#define DUMP_LAST 3
|
|
|
|
#define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF)
|
|
#define DUMP_FLAGS(arg) (((u32)(arg)) >> 16)
|
|
|
|
static int
|
|
ip_set_dump_done(struct netlink_callback *cb)
|
|
{
|
|
if (cb->args[IPSET_CB_ARG0]) {
|
|
struct ip_set_net *inst =
|
|
(struct ip_set_net *)cb->args[IPSET_CB_NET];
|
|
ip_set_id_t index = (ip_set_id_t)cb->args[IPSET_CB_INDEX];
|
|
struct ip_set *set = ip_set(inst, index);
|
|
|
|
if (set->variant->uref)
|
|
set->variant->uref(set, cb, false);
|
|
pr_debug("release set %s\n", set->name);
|
|
__ip_set_put_netlink(set);
|
|
}
|
|
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 ip_set_net *inst)
|
|
{
|
|
struct nlmsghdr *nlh = nlmsg_hdr(cb->skb);
|
|
int min_len = nlmsg_total_size(sizeof(struct nfgenmsg));
|
|
struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1];
|
|
struct nlattr *attr = (void *)nlh + min_len;
|
|
u32 dump_type;
|
|
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);
|
|
|
|
if (cda[IPSET_ATTR_SETNAME]) {
|
|
struct ip_set *set;
|
|
|
|
set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]),
|
|
&index);
|
|
if (!set)
|
|
return -ENOENT;
|
|
|
|
dump_type = DUMP_ONE;
|
|
cb->args[IPSET_CB_INDEX] = index;
|
|
} else {
|
|
dump_type = DUMP_ALL;
|
|
}
|
|
|
|
if (cda[IPSET_ATTR_FLAGS]) {
|
|
u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]);
|
|
|
|
dump_type |= (f << 16);
|
|
}
|
|
cb->args[IPSET_CB_NET] = (unsigned long)inst;
|
|
cb->args[IPSET_CB_DUMP] = dump_type;
|
|
|
|
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).portid ? NLM_F_MULTI : 0;
|
|
struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk));
|
|
u32 dump_type, dump_flags;
|
|
bool is_destroyed;
|
|
int ret = 0;
|
|
|
|
if (!cb->args[IPSET_CB_DUMP]) {
|
|
ret = dump_init(cb, inst);
|
|
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[IPSET_CB_INDEX] >= inst->ip_set_max)
|
|
goto out;
|
|
|
|
dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]);
|
|
dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]);
|
|
max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1
|
|
: inst->ip_set_max;
|
|
dump_last:
|
|
pr_debug("dump type, flag: %u %u index: %ld\n",
|
|
dump_type, dump_flags, cb->args[IPSET_CB_INDEX]);
|
|
for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) {
|
|
index = (ip_set_id_t)cb->args[IPSET_CB_INDEX];
|
|
write_lock_bh(&ip_set_ref_lock);
|
|
set = ip_set(inst, index);
|
|
is_destroyed = inst->is_destroyed;
|
|
if (!set || is_destroyed) {
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
if (dump_type == DUMP_ONE) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
if (is_destroyed) {
|
|
/* All sets are just being destroyed */
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
continue;
|
|
}
|
|
/* When dumping all sets, we must dump "sorted"
|
|
* so that lists (unions of sets) are dumped last.
|
|
*/
|
|
if (dump_type != DUMP_ONE &&
|
|
((dump_type == DUMP_ALL) ==
|
|
!!(set->type->features & IPSET_DUMP_LAST))) {
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
continue;
|
|
}
|
|
pr_debug("List set: %s\n", set->name);
|
|
if (!cb->args[IPSET_CB_ARG0]) {
|
|
/* Start listing: make sure set won't be destroyed */
|
|
pr_debug("reference set\n");
|
|
set->ref_netlink++;
|
|
}
|
|
write_unlock_bh(&ip_set_ref_lock);
|
|
nlh = start_msg(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, flags,
|
|
IPSET_CMD_LIST);
|
|
if (!nlh) {
|
|
ret = -EMSGSIZE;
|
|
goto release_refcount;
|
|
}
|
|
if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) ||
|
|
nla_put_string(skb, IPSET_ATTR_SETNAME, set->name))
|
|
goto nla_put_failure;
|
|
if (dump_flags & IPSET_FLAG_LIST_SETNAME)
|
|
goto next_set;
|
|
switch (cb->args[IPSET_CB_ARG0]) {
|
|
case 0:
|
|
/* Core header data */
|
|
if (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->revision))
|
|
goto nla_put_failure;
|
|
ret = set->variant->head(set, skb);
|
|
if (ret < 0)
|
|
goto release_refcount;
|
|
if (dump_flags & IPSET_FLAG_LIST_HEADER)
|
|
goto next_set;
|
|
if (set->variant->uref)
|
|
set->variant->uref(set, cb, true);
|
|
/* Fall through and add elements */
|
|
default:
|
|
rcu_read_lock_bh();
|
|
ret = set->variant->list(set, skb, cb);
|
|
rcu_read_unlock_bh();
|
|
if (!cb->args[IPSET_CB_ARG0])
|
|
/* Set is done, proceed with next one */
|
|
goto next_set;
|
|
goto release_refcount;
|
|
}
|
|
}
|
|
/* If we dump all sets, continue with dumping last ones */
|
|
if (dump_type == DUMP_ALL) {
|
|
dump_type = DUMP_LAST;
|
|
cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16);
|
|
cb->args[IPSET_CB_INDEX] = 0;
|
|
if (set && set->variant->uref)
|
|
set->variant->uref(set, cb, false);
|
|
goto dump_last;
|
|
}
|
|
goto out;
|
|
|
|
nla_put_failure:
|
|
ret = -EFAULT;
|
|
next_set:
|
|
if (dump_type == DUMP_ONE)
|
|
cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID;
|
|
else
|
|
cb->args[IPSET_CB_INDEX]++;
|
|
release_refcount:
|
|
/* If there was an error or set is done, release set */
|
|
if (ret || !cb->args[IPSET_CB_ARG0]) {
|
|
set = ip_set(inst, index);
|
|
if (set->variant->uref)
|
|
set->variant->uref(set, cb, false);
|
|
pr_debug("release set %s\n", set->name);
|
|
__ip_set_put_netlink(set);
|
|
cb->args[IPSET_CB_ARG0] = 0;
|
|
}
|
|
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 net *net, 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;
|
|
|
|
{
|
|
struct netlink_dump_control c = {
|
|
.dump = ip_set_dump_start,
|
|
.done = ip_set_dump_done,
|
|
};
|
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
u32 lineno = 0;
|
|
bool eexist = flags & IPSET_FLAG_EXIST, retried = false;
|
|
|
|
do {
|
|
spin_lock_bh(&set->lock);
|
|
ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried);
|
|
spin_unlock_bh(&set->lock);
|
|
retried = true;
|
|
} 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 = min(SIZE_MAX,
|
|
sizeof(*errmsg) + nlmsg_len(nlh));
|
|
int min_len = nlmsg_total_size(sizeof(struct nfgenmsg));
|
|
struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1];
|
|
struct nlattr *cmdattr;
|
|
u32 *errline;
|
|
|
|
skb2 = nlmsg_new(payload, GFP_KERNEL);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid,
|
|
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).portid,
|
|
MSG_DONTWAIT);
|
|
/* Signal netlink not to send its ACK/errmsg. */
|
|
return -EINTR;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ip_set_uadd(struct net *net, struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
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] ||
|
|
!((attr[IPSET_ATTR_DATA] != NULL) ^
|
|
(attr[IPSET_ATTR_ADT] != NULL)) ||
|
|
(attr[IPSET_ATTR_DATA] &&
|
|
!flag_nested(attr[IPSET_ATTR_DATA])) ||
|
|
(attr[IPSET_ATTR_ADT] &&
|
|
(!flag_nested(attr[IPSET_ATTR_ADT]) ||
|
|
!attr[IPSET_ATTR_LINENO]))))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (!set)
|
|
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 net *net, struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
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] ||
|
|
!((attr[IPSET_ATTR_DATA] != NULL) ^
|
|
(attr[IPSET_ATTR_ADT] != NULL)) ||
|
|
(attr[IPSET_ATTR_DATA] &&
|
|
!flag_nested(attr[IPSET_ATTR_DATA])) ||
|
|
(attr[IPSET_ATTR_ADT] &&
|
|
(!flag_nested(attr[IPSET_ATTR_ADT]) ||
|
|
!attr[IPSET_ATTR_LINENO]))))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (!set)
|
|
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 net *net, struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
struct ip_set *set;
|
|
struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {};
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
!attr[IPSET_ATTR_SETNAME] ||
|
|
!attr[IPSET_ATTR_DATA] ||
|
|
!flag_nested(attr[IPSET_ATTR_DATA])))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (!set)
|
|
return -ENOENT;
|
|
|
|
if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA],
|
|
set->type->adt_policy))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
rcu_read_lock_bh();
|
|
ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0);
|
|
rcu_read_unlock_bh();
|
|
/* Userspace can't trigger element to be re-added */
|
|
if (ret == -EAGAIN)
|
|
ret = 1;
|
|
|
|
return ret > 0 ? 0 : -IPSET_ERR_EXIST;
|
|
}
|
|
|
|
/* Get headed data of a set */
|
|
|
|
static int ip_set_header(struct net *net, struct sock *ctnl,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const attr[])
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
const struct ip_set *set;
|
|
struct sk_buff *skb2;
|
|
struct nlmsghdr *nlh2;
|
|
int ret = 0;
|
|
|
|
if (unlikely(protocol_failed(attr) ||
|
|
!attr[IPSET_ATTR_SETNAME]))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
|
|
if (!set)
|
|
return -ENOENT;
|
|
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
|
|
IPSET_CMD_HEADER);
|
|
if (!nlh2)
|
|
goto nlmsg_failure;
|
|
if (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->revision))
|
|
goto nla_put_failure;
|
|
nlmsg_end(skb2, nlh2);
|
|
|
|
ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, 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 net *net, 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] ||
|
|
!attr[IPSET_ATTR_FAMILY]))
|
|
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)
|
|
return -ENOMEM;
|
|
|
|
nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
|
|
IPSET_CMD_TYPE);
|
|
if (!nlh2)
|
|
goto nlmsg_failure;
|
|
if (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))
|
|
goto nla_put_failure;
|
|
nlmsg_end(skb2, nlh2);
|
|
|
|
pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len);
|
|
ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, 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 net *net, 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]))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
|
|
IPSET_CMD_PROTOCOL);
|
|
if (!nlh2)
|
|
goto nlmsg_failure;
|
|
if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL))
|
|
goto nla_put_failure;
|
|
nlmsg_end(skb2, nlh2);
|
|
|
|
ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, 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_NONE] = {
|
|
.call = ip_set_none,
|
|
.attr_count = IPSET_ATTR_CMD_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 int *op;
|
|
void *data;
|
|
int copylen = *len, ret = 0;
|
|
struct net *net = sock_net(sk);
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
if (optval != SO_IP_SET)
|
|
return -EBADF;
|
|
if (*len < sizeof(unsigned int))
|
|
return -EINVAL;
|
|
|
|
data = vmalloc(*len);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
if (copy_from_user(data, user, *len) != 0) {
|
|
ret = -EFAULT;
|
|
goto done;
|
|
}
|
|
op = (unsigned int *)data;
|
|
|
|
if (*op < IP_SET_OP_VERSION) {
|
|
/* Check the version at the beginning of operations */
|
|
struct ip_set_req_version *req_version = data;
|
|
|
|
if (*len < sizeof(struct ip_set_req_version)) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
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;
|
|
ip_set_id_t id;
|
|
|
|
if (*len != sizeof(struct ip_set_req_get_set)) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0';
|
|
nfnl_lock(NFNL_SUBSYS_IPSET);
|
|
find_set_and_id(inst, req_get->set.name, &id);
|
|
req_get->set.index = id;
|
|
nfnl_unlock(NFNL_SUBSYS_IPSET);
|
|
goto copy;
|
|
}
|
|
case IP_SET_OP_GET_FNAME: {
|
|
struct ip_set_req_get_set_family *req_get = data;
|
|
ip_set_id_t id;
|
|
|
|
if (*len != sizeof(struct ip_set_req_get_set_family)) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0';
|
|
nfnl_lock(NFNL_SUBSYS_IPSET);
|
|
find_set_and_id(inst, req_get->set.name, &id);
|
|
req_get->set.index = id;
|
|
if (id != IPSET_INVALID_ID)
|
|
req_get->family = ip_set(inst, id)->family;
|
|
nfnl_unlock(NFNL_SUBSYS_IPSET);
|
|
goto copy;
|
|
}
|
|
case IP_SET_OP_GET_BYINDEX: {
|
|
struct ip_set_req_get_set *req_get = data;
|
|
struct ip_set *set;
|
|
|
|
if (*len != sizeof(struct ip_set_req_get_set) ||
|
|
req_get->set.index >= inst->ip_set_max) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
nfnl_lock(NFNL_SUBSYS_IPSET);
|
|
set = ip_set(inst, req_get->set.index);
|
|
strncpy(req_get->set.name, set ? set->name : "",
|
|
IPSET_MAXNAMELEN);
|
|
nfnl_unlock(NFNL_SUBSYS_IPSET);
|
|
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 __net_init
|
|
ip_set_net_init(struct net *net)
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
struct ip_set **list;
|
|
|
|
inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX;
|
|
if (inst->ip_set_max >= IPSET_INVALID_ID)
|
|
inst->ip_set_max = IPSET_INVALID_ID - 1;
|
|
|
|
list = kcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL);
|
|
if (!list)
|
|
return -ENOMEM;
|
|
inst->is_deleted = false;
|
|
inst->is_destroyed = false;
|
|
rcu_assign_pointer(inst->ip_set_list, list);
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit
|
|
ip_set_net_exit(struct net *net)
|
|
{
|
|
struct ip_set_net *inst = ip_set_pernet(net);
|
|
|
|
struct ip_set *set = NULL;
|
|
ip_set_id_t i;
|
|
|
|
inst->is_deleted = true; /* flag for ip_set_nfnl_put */
|
|
|
|
for (i = 0; i < inst->ip_set_max; i++) {
|
|
set = ip_set(inst, i);
|
|
if (set) {
|
|
ip_set(inst, i) = NULL;
|
|
ip_set_destroy_set(set);
|
|
}
|
|
}
|
|
kfree(rcu_dereference_protected(inst->ip_set_list, 1));
|
|
}
|
|
|
|
static struct pernet_operations ip_set_net_ops = {
|
|
.init = ip_set_net_init,
|
|
.exit = ip_set_net_exit,
|
|
.id = &ip_set_net_id,
|
|
.size = sizeof(struct ip_set_net)
|
|
};
|
|
|
|
static int __init
|
|
ip_set_init(void)
|
|
{
|
|
int ret = nfnetlink_subsys_register(&ip_set_netlink_subsys);
|
|
|
|
if (ret != 0) {
|
|
pr_err("ip_set: cannot register with nfnetlink.\n");
|
|
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);
|
|
return ret;
|
|
}
|
|
ret = register_pernet_subsys(&ip_set_net_ops);
|
|
if (ret) {
|
|
pr_err("ip_set: cannot register pernet_subsys.\n");
|
|
nf_unregister_sockopt(&so_set);
|
|
nfnetlink_subsys_unregister(&ip_set_netlink_subsys);
|
|
return ret;
|
|
}
|
|
pr_info("ip_set: protocol %u\n", IPSET_PROTOCOL);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
ip_set_fini(void)
|
|
{
|
|
unregister_pernet_subsys(&ip_set_net_ops);
|
|
nf_unregister_sockopt(&so_set);
|
|
nfnetlink_subsys_unregister(&ip_set_netlink_subsys);
|
|
pr_debug("these are the famous last words\n");
|
|
}
|
|
|
|
module_init(ip_set_init);
|
|
module_exit(ip_set_fini);
|