40b446a1d8
If we use before/after to add an element to an empty list it will cause a kernel panic. $> cat crash.restore create a hash:ip create b hash:ip create test list:set timeout 5 size 4 add test b before a $> ipset -R < crash.restore Executing the above will crash the kernel. Signed-off-by: Vishwanath Pai <vpai@akamai.com> Reviewed-by: Josh Hunt <johunt@akamai.com> Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
691 lines
17 KiB
C
691 lines
17 KiB
C
/* Copyright (C) 2008-2013 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 implementing an IP set type: the list:set type */
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#include <linux/module.h>
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#include <linux/ip.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/netfilter/ipset/ip_set.h>
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#include <linux/netfilter/ipset/ip_set_list.h>
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#define IPSET_TYPE_REV_MIN 0
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/* 1 Counters support added */
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/* 2 Comments support added */
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#define IPSET_TYPE_REV_MAX 3 /* skbinfo support added */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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IP_SET_MODULE_DESC("list:set", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
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MODULE_ALIAS("ip_set_list:set");
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/* Member elements */
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struct set_elem {
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struct rcu_head rcu;
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struct list_head list;
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struct ip_set *set; /* Sigh, in order to cleanup reference */
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ip_set_id_t id;
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} __aligned(__alignof__(u64));
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struct set_adt_elem {
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ip_set_id_t id;
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ip_set_id_t refid;
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int before;
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};
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/* Type structure */
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struct list_set {
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u32 size; /* size of set list array */
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struct timer_list gc; /* garbage collection */
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struct net *net; /* namespace */
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struct list_head members; /* the set members */
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};
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static int
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list_set_ktest(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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struct ip_set_adt_opt *opt, const struct ip_set_ext *ext)
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{
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struct list_set *map = set->data;
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struct set_elem *e;
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u32 cmdflags = opt->cmdflags;
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int ret;
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/* Don't lookup sub-counters at all */
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opt->cmdflags &= ~IPSET_FLAG_MATCH_COUNTERS;
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if (opt->cmdflags & IPSET_FLAG_SKIP_SUBCOUNTER_UPDATE)
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opt->cmdflags &= ~IPSET_FLAG_SKIP_COUNTER_UPDATE;
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list_for_each_entry_rcu(e, &map->members, list) {
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if (SET_WITH_TIMEOUT(set) &&
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ip_set_timeout_expired(ext_timeout(e, set)))
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continue;
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ret = ip_set_test(e->id, skb, par, opt);
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if (ret > 0) {
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if (SET_WITH_COUNTER(set))
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ip_set_update_counter(ext_counter(e, set),
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ext, &opt->ext,
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cmdflags);
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if (SET_WITH_SKBINFO(set))
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ip_set_get_skbinfo(ext_skbinfo(e, set),
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ext, &opt->ext,
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cmdflags);
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return ret;
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}
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}
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return 0;
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}
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static int
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list_set_kadd(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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struct ip_set_adt_opt *opt, const struct ip_set_ext *ext)
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{
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struct list_set *map = set->data;
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struct set_elem *e;
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int ret;
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list_for_each_entry(e, &map->members, list) {
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if (SET_WITH_TIMEOUT(set) &&
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ip_set_timeout_expired(ext_timeout(e, set)))
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continue;
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ret = ip_set_add(e->id, skb, par, opt);
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if (ret == 0)
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return ret;
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}
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return 0;
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}
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static int
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list_set_kdel(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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struct ip_set_adt_opt *opt, const struct ip_set_ext *ext)
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{
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struct list_set *map = set->data;
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struct set_elem *e;
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int ret;
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list_for_each_entry(e, &map->members, list) {
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if (SET_WITH_TIMEOUT(set) &&
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ip_set_timeout_expired(ext_timeout(e, set)))
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continue;
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ret = ip_set_del(e->id, skb, par, opt);
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if (ret == 0)
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return ret;
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}
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return 0;
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}
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static int
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list_set_kadt(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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enum ipset_adt adt, struct ip_set_adt_opt *opt)
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{
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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int ret = -EINVAL;
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rcu_read_lock();
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switch (adt) {
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case IPSET_TEST:
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ret = list_set_ktest(set, skb, par, opt, &ext);
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break;
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case IPSET_ADD:
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ret = list_set_kadd(set, skb, par, opt, &ext);
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break;
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case IPSET_DEL:
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ret = list_set_kdel(set, skb, par, opt, &ext);
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break;
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default:
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break;
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}
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rcu_read_unlock();
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return ret;
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}
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/* Userspace interfaces: we are protected by the nfnl mutex */
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static void
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__list_set_del_rcu(struct rcu_head * rcu)
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{
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struct set_elem *e = container_of(rcu, struct set_elem, rcu);
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struct ip_set *set = e->set;
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struct list_set *map = set->data;
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ip_set_put_byindex(map->net, e->id);
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ip_set_ext_destroy(set, e);
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kfree(e);
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}
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static inline void
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list_set_del(struct ip_set *set, struct set_elem *e)
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{
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set->elements--;
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list_del_rcu(&e->list);
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call_rcu(&e->rcu, __list_set_del_rcu);
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}
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static inline void
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list_set_replace(struct set_elem *e, struct set_elem *old)
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{
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list_replace_rcu(&old->list, &e->list);
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call_rcu(&old->rcu, __list_set_del_rcu);
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}
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static void
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set_cleanup_entries(struct ip_set *set)
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{
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struct list_set *map = set->data;
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struct set_elem *e, *n;
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list_for_each_entry_safe(e, n, &map->members, list)
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if (ip_set_timeout_expired(ext_timeout(e, set)))
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list_set_del(set, e);
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}
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static int
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list_set_utest(struct ip_set *set, void *value, const struct ip_set_ext *ext,
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struct ip_set_ext *mext, u32 flags)
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{
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struct list_set *map = set->data;
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struct set_adt_elem *d = value;
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struct set_elem *e, *next, *prev = NULL;
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int ret;
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list_for_each_entry(e, &map->members, list) {
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if (SET_WITH_TIMEOUT(set) &&
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ip_set_timeout_expired(ext_timeout(e, set)))
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continue;
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else if (e->id != d->id) {
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prev = e;
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continue;
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}
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if (d->before == 0) {
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ret = 1;
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} else if (d->before > 0) {
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next = list_next_entry(e, list);
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ret = !list_is_last(&e->list, &map->members) &&
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next->id == d->refid;
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} else {
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ret = prev && prev->id == d->refid;
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}
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return ret;
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}
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return 0;
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}
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static void
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list_set_init_extensions(struct ip_set *set, const struct ip_set_ext *ext,
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struct set_elem *e)
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{
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if (SET_WITH_COUNTER(set))
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ip_set_init_counter(ext_counter(e, set), ext);
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if (SET_WITH_COMMENT(set))
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ip_set_init_comment(set, ext_comment(e, set), ext);
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if (SET_WITH_SKBINFO(set))
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ip_set_init_skbinfo(ext_skbinfo(e, set), ext);
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/* Update timeout last */
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if (SET_WITH_TIMEOUT(set))
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ip_set_timeout_set(ext_timeout(e, set), ext->timeout);
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}
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static int
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list_set_uadd(struct ip_set *set, void *value, const struct ip_set_ext *ext,
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struct ip_set_ext *mext, u32 flags)
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{
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struct list_set *map = set->data;
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struct set_adt_elem *d = value;
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struct set_elem *e, *n, *prev, *next;
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bool flag_exist = flags & IPSET_FLAG_EXIST;
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/* Find where to add the new entry */
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n = prev = next = NULL;
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list_for_each_entry(e, &map->members, list) {
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if (SET_WITH_TIMEOUT(set) &&
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ip_set_timeout_expired(ext_timeout(e, set)))
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continue;
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else if (d->id == e->id)
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n = e;
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else if (d->before == 0 || e->id != d->refid)
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continue;
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else if (d->before > 0)
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next = e;
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else
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prev = e;
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}
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/* If before/after is used on an empty set */
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if ((d->before > 0 && !next) ||
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(d->before < 0 && !prev))
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return -IPSET_ERR_REF_EXIST;
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/* Re-add already existing element */
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if (n) {
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if (!flag_exist)
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return -IPSET_ERR_EXIST;
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/* Update extensions */
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ip_set_ext_destroy(set, n);
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list_set_init_extensions(set, ext, n);
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/* Set is already added to the list */
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ip_set_put_byindex(map->net, d->id);
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return 0;
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}
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/* Add new entry */
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if (d->before == 0) {
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/* Append */
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n = list_empty(&map->members) ? NULL :
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list_last_entry(&map->members, struct set_elem, list);
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} else if (d->before > 0) {
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/* Insert after next element */
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if (!list_is_last(&next->list, &map->members))
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n = list_next_entry(next, list);
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} else {
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/* Insert before prev element */
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if (prev->list.prev != &map->members)
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n = list_prev_entry(prev, list);
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}
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/* Can we replace a timed out entry? */
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if (n &&
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!(SET_WITH_TIMEOUT(set) &&
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ip_set_timeout_expired(ext_timeout(n, set))))
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n = NULL;
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e = kzalloc(set->dsize, GFP_ATOMIC);
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if (!e)
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return -ENOMEM;
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e->id = d->id;
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e->set = set;
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INIT_LIST_HEAD(&e->list);
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list_set_init_extensions(set, ext, e);
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if (n)
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list_set_replace(e, n);
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else if (next)
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list_add_tail_rcu(&e->list, &next->list);
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else if (prev)
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list_add_rcu(&e->list, &prev->list);
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else
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list_add_tail_rcu(&e->list, &map->members);
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set->elements++;
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return 0;
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}
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static int
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list_set_udel(struct ip_set *set, void *value, const struct ip_set_ext *ext,
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struct ip_set_ext *mext, u32 flags)
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{
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struct list_set *map = set->data;
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struct set_adt_elem *d = value;
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struct set_elem *e, *next, *prev = NULL;
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list_for_each_entry(e, &map->members, list) {
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if (SET_WITH_TIMEOUT(set) &&
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ip_set_timeout_expired(ext_timeout(e, set)))
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continue;
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else if (e->id != d->id) {
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prev = e;
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continue;
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}
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if (d->before > 0) {
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next = list_next_entry(e, list);
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if (list_is_last(&e->list, &map->members) ||
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next->id != d->refid)
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return -IPSET_ERR_REF_EXIST;
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} else if (d->before < 0) {
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if (!prev || prev->id != d->refid)
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return -IPSET_ERR_REF_EXIST;
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}
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list_set_del(set, e);
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return 0;
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}
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return d->before != 0 ? -IPSET_ERR_REF_EXIST : -IPSET_ERR_EXIST;
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}
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static int
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list_set_uadt(struct ip_set *set, struct nlattr *tb[],
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enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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{
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struct list_set *map = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct set_adt_elem e = { .refid = IPSET_INVALID_ID };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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struct ip_set *s;
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int ret = 0;
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if (tb[IPSET_ATTR_LINENO])
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*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
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if (unlikely(!tb[IPSET_ATTR_NAME] ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
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return -IPSET_ERR_PROTOCOL;
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ret = ip_set_get_extensions(set, tb, &ext);
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if (ret)
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return ret;
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e.id = ip_set_get_byname(map->net, nla_data(tb[IPSET_ATTR_NAME]), &s);
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if (e.id == IPSET_INVALID_ID)
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return -IPSET_ERR_NAME;
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/* "Loop detection" */
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if (s->type->features & IPSET_TYPE_NAME) {
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ret = -IPSET_ERR_LOOP;
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goto finish;
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}
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if (tb[IPSET_ATTR_CADT_FLAGS]) {
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u32 f = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
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e.before = f & IPSET_FLAG_BEFORE;
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}
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if (e.before && !tb[IPSET_ATTR_NAMEREF]) {
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ret = -IPSET_ERR_BEFORE;
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goto finish;
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}
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if (tb[IPSET_ATTR_NAMEREF]) {
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e.refid = ip_set_get_byname(map->net,
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nla_data(tb[IPSET_ATTR_NAMEREF]),
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&s);
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if (e.refid == IPSET_INVALID_ID) {
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ret = -IPSET_ERR_NAMEREF;
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goto finish;
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}
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if (!e.before)
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e.before = -1;
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}
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if (adt != IPSET_TEST && SET_WITH_TIMEOUT(set))
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set_cleanup_entries(set);
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ret = adtfn(set, &e, &ext, &ext, flags);
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finish:
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if (e.refid != IPSET_INVALID_ID)
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ip_set_put_byindex(map->net, e.refid);
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if (adt != IPSET_ADD || ret)
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ip_set_put_byindex(map->net, e.id);
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return ip_set_eexist(ret, flags) ? 0 : ret;
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}
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static void
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list_set_flush(struct ip_set *set)
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{
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struct list_set *map = set->data;
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struct set_elem *e, *n;
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list_for_each_entry_safe(e, n, &map->members, list)
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list_set_del(set, e);
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set->elements = 0;
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set->ext_size = 0;
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}
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static void
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list_set_destroy(struct ip_set *set)
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{
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struct list_set *map = set->data;
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struct set_elem *e, *n;
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if (SET_WITH_TIMEOUT(set))
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del_timer_sync(&map->gc);
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list_for_each_entry_safe(e, n, &map->members, list) {
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list_del(&e->list);
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ip_set_put_byindex(map->net, e->id);
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ip_set_ext_destroy(set, e);
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kfree(e);
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}
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kfree(map);
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set->data = NULL;
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}
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/* Calculate the actual memory size of the set data */
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static size_t
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list_set_memsize(const struct list_set *map, size_t dsize)
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{
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struct set_elem *e;
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size_t memsize;
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u32 n = 0;
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rcu_read_lock();
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list_for_each_entry_rcu(e, &map->members, list)
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n++;
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rcu_read_unlock();
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memsize = sizeof(*map) + n * dsize;
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return memsize;
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}
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static int
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list_set_head(struct ip_set *set, struct sk_buff *skb)
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{
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const struct list_set *map = set->data;
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struct nlattr *nested;
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size_t memsize = list_set_memsize(map, set->dsize) + set->ext_size;
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nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
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if (!nested)
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goto nla_put_failure;
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if (nla_put_net32(skb, IPSET_ATTR_SIZE, htonl(map->size)) ||
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nla_put_net32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref)) ||
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nla_put_net32(skb, IPSET_ATTR_MEMSIZE, htonl(memsize)) ||
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nla_put_net32(skb, IPSET_ATTR_ELEMENTS, htonl(set->elements)))
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goto nla_put_failure;
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if (unlikely(ip_set_put_flags(skb, set)))
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goto nla_put_failure;
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ipset_nest_end(skb, nested);
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|
|
return 0;
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int
|
|
list_set_list(const struct ip_set *set,
|
|
struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
const struct list_set *map = set->data;
|
|
struct nlattr *atd, *nested;
|
|
u32 i = 0, first = cb->args[IPSET_CB_ARG0];
|
|
struct set_elem *e;
|
|
int ret = 0;
|
|
|
|
atd = ipset_nest_start(skb, IPSET_ATTR_ADT);
|
|
if (!atd)
|
|
return -EMSGSIZE;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(e, &map->members, list) {
|
|
if (i < first ||
|
|
(SET_WITH_TIMEOUT(set) &&
|
|
ip_set_timeout_expired(ext_timeout(e, set)))) {
|
|
i++;
|
|
continue;
|
|
}
|
|
nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
|
|
if (!nested)
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, IPSET_ATTR_NAME,
|
|
ip_set_name_byindex(map->net, e->id)))
|
|
goto nla_put_failure;
|
|
if (ip_set_put_extensions(skb, set, e, true))
|
|
goto nla_put_failure;
|
|
ipset_nest_end(skb, nested);
|
|
i++;
|
|
}
|
|
|
|
ipset_nest_end(skb, atd);
|
|
/* Set listing finished */
|
|
cb->args[IPSET_CB_ARG0] = 0;
|
|
goto out;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nested);
|
|
if (unlikely(i == first)) {
|
|
nla_nest_cancel(skb, atd);
|
|
cb->args[IPSET_CB_ARG0] = 0;
|
|
ret = -EMSGSIZE;
|
|
} else {
|
|
cb->args[IPSET_CB_ARG0] = i;
|
|
}
|
|
ipset_nest_end(skb, atd);
|
|
out:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
static bool
|
|
list_set_same_set(const struct ip_set *a, const struct ip_set *b)
|
|
{
|
|
const struct list_set *x = a->data;
|
|
const struct list_set *y = b->data;
|
|
|
|
return x->size == y->size &&
|
|
a->timeout == b->timeout &&
|
|
a->extensions == b->extensions;
|
|
}
|
|
|
|
static const struct ip_set_type_variant set_variant = {
|
|
.kadt = list_set_kadt,
|
|
.uadt = list_set_uadt,
|
|
.adt = {
|
|
[IPSET_ADD] = list_set_uadd,
|
|
[IPSET_DEL] = list_set_udel,
|
|
[IPSET_TEST] = list_set_utest,
|
|
},
|
|
.destroy = list_set_destroy,
|
|
.flush = list_set_flush,
|
|
.head = list_set_head,
|
|
.list = list_set_list,
|
|
.same_set = list_set_same_set,
|
|
};
|
|
|
|
static void
|
|
list_set_gc(unsigned long ul_set)
|
|
{
|
|
struct ip_set *set = (struct ip_set *)ul_set;
|
|
struct list_set *map = set->data;
|
|
|
|
spin_lock_bh(&set->lock);
|
|
set_cleanup_entries(set);
|
|
spin_unlock_bh(&set->lock);
|
|
|
|
map->gc.expires = jiffies + IPSET_GC_PERIOD(set->timeout) * HZ;
|
|
add_timer(&map->gc);
|
|
}
|
|
|
|
static void
|
|
list_set_gc_init(struct ip_set *set, void (*gc)(unsigned long ul_set))
|
|
{
|
|
struct list_set *map = set->data;
|
|
|
|
setup_timer(&map->gc, gc, (unsigned long)set);
|
|
mod_timer(&map->gc, jiffies + IPSET_GC_PERIOD(set->timeout) * HZ);
|
|
}
|
|
|
|
/* Create list:set type of sets */
|
|
|
|
static bool
|
|
init_list_set(struct net *net, struct ip_set *set, u32 size)
|
|
{
|
|
struct list_set *map;
|
|
|
|
map = kzalloc(sizeof(*map), GFP_KERNEL);
|
|
if (!map)
|
|
return false;
|
|
|
|
map->size = size;
|
|
map->net = net;
|
|
INIT_LIST_HEAD(&map->members);
|
|
set->data = map;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int
|
|
list_set_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
|
|
u32 flags)
|
|
{
|
|
u32 size = IP_SET_LIST_DEFAULT_SIZE;
|
|
|
|
if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_SIZE) ||
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
if (tb[IPSET_ATTR_SIZE])
|
|
size = ip_set_get_h32(tb[IPSET_ATTR_SIZE]);
|
|
if (size < IP_SET_LIST_MIN_SIZE)
|
|
size = IP_SET_LIST_MIN_SIZE;
|
|
|
|
set->variant = &set_variant;
|
|
set->dsize = ip_set_elem_len(set, tb, sizeof(struct set_elem),
|
|
__alignof__(struct set_elem));
|
|
if (!init_list_set(net, set, size))
|
|
return -ENOMEM;
|
|
if (tb[IPSET_ATTR_TIMEOUT]) {
|
|
set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
|
|
list_set_gc_init(set, list_set_gc);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct ip_set_type list_set_type __read_mostly = {
|
|
.name = "list:set",
|
|
.protocol = IPSET_PROTOCOL,
|
|
.features = IPSET_TYPE_NAME | IPSET_DUMP_LAST,
|
|
.dimension = IPSET_DIM_ONE,
|
|
.family = NFPROTO_UNSPEC,
|
|
.revision_min = IPSET_TYPE_REV_MIN,
|
|
.revision_max = IPSET_TYPE_REV_MAX,
|
|
.create = list_set_create,
|
|
.create_policy = {
|
|
[IPSET_ATTR_SIZE] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
|
|
},
|
|
.adt_policy = {
|
|
[IPSET_ATTR_NAME] = { .type = NLA_STRING,
|
|
.len = IPSET_MAXNAMELEN },
|
|
[IPSET_ATTR_NAMEREF] = { .type = NLA_STRING,
|
|
.len = IPSET_MAXNAMELEN },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_BYTES] = { .type = NLA_U64 },
|
|
[IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
|
|
[IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
|
|
.len = IPSET_MAX_COMMENT_SIZE },
|
|
[IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
|
|
[IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
|
|
},
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init
|
|
list_set_init(void)
|
|
{
|
|
return ip_set_type_register(&list_set_type);
|
|
}
|
|
|
|
static void __exit
|
|
list_set_fini(void)
|
|
{
|
|
rcu_barrier();
|
|
ip_set_type_unregister(&list_set_type);
|
|
}
|
|
|
|
module_init(list_set_init);
|
|
module_exit(list_set_fini);
|