482 lines
11 KiB
C
482 lines
11 KiB
C
/* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* Kernel module implementing an IP set type: the hash:ip type */
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#include <linux/jhash.h>
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#include <linux/module.h>
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#include <linux/ip.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/random.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/netlink.h>
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#include <net/tcp.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/ipset/pfxlen.h>
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#include <linux/netfilter/ipset/ip_set.h>
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#include <linux/netfilter/ipset/ip_set_timeout.h>
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#include <linux/netfilter/ipset/ip_set_hash.h>
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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("hash:ip type of IP sets");
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MODULE_ALIAS("ip_set_hash:ip");
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/* Type specific function prefix */
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#define TYPE hash_ip
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static bool
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hash_ip_same_set(const struct ip_set *a, const struct ip_set *b);
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#define hash_ip4_same_set hash_ip_same_set
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#define hash_ip6_same_set hash_ip_same_set
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/* The type variant functions: IPv4 */
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/* Member elements without timeout */
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struct hash_ip4_elem {
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__be32 ip;
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};
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/* Member elements with timeout support */
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struct hash_ip4_telem {
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__be32 ip;
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unsigned long timeout;
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};
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static inline bool
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hash_ip4_data_equal(const struct hash_ip4_elem *ip1,
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const struct hash_ip4_elem *ip2,
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u32 *multi)
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{
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return ip1->ip == ip2->ip;
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}
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static inline bool
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hash_ip4_data_isnull(const struct hash_ip4_elem *elem)
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{
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return elem->ip == 0;
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}
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static inline void
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hash_ip4_data_copy(struct hash_ip4_elem *dst, const struct hash_ip4_elem *src)
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{
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dst->ip = src->ip;
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}
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/* Zero valued IP addresses cannot be stored */
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static inline void
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hash_ip4_data_zero_out(struct hash_ip4_elem *elem)
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{
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elem->ip = 0;
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}
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static inline bool
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hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *data)
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{
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NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, data->ip);
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return 0;
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nla_put_failure:
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return 1;
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}
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static bool
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hash_ip4_data_tlist(struct sk_buff *skb, const struct hash_ip4_elem *data)
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{
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const struct hash_ip4_telem *tdata =
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(const struct hash_ip4_telem *)data;
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NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, tdata->ip);
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NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,
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htonl(ip_set_timeout_get(tdata->timeout)));
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return 0;
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nla_put_failure:
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return 1;
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}
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#define IP_SET_HASH_WITH_NETMASK
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#define PF 4
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#define HOST_MASK 32
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#include <linux/netfilter/ipset/ip_set_ahash.h>
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static inline void
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hash_ip4_data_next(struct ip_set_hash *h, const struct hash_ip4_elem *d)
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{
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h->next.ip = ntohl(d->ip);
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}
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static int
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hash_ip4_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, const struct ip_set_adt_opt *opt)
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{
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const struct ip_set_hash *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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__be32 ip;
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ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
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ip &= ip_set_netmask(h->netmask);
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if (ip == 0)
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return -EINVAL;
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return adtfn(set, &ip, opt_timeout(opt, h), opt->cmdflags);
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}
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static int
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hash_ip4_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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const struct ip_set_hash *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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u32 ip, ip_to, hosts, timeout = h->timeout;
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__be32 nip;
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int ret = 0;
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if (unlikely(!tb[IPSET_ATTR_IP] ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
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return -IPSET_ERR_PROTOCOL;
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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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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
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if (ret)
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return ret;
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ip &= ip_set_hostmask(h->netmask);
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if (tb[IPSET_ATTR_TIMEOUT]) {
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if (!with_timeout(h->timeout))
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return -IPSET_ERR_TIMEOUT;
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timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
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}
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if (adt == IPSET_TEST) {
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nip = htonl(ip);
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if (nip == 0)
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return -IPSET_ERR_HASH_ELEM;
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return adtfn(set, &nip, timeout, flags);
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}
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if (tb[IPSET_ATTR_IP_TO]) {
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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
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if (ret)
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return ret;
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if (ip > ip_to)
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swap(ip, ip_to);
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} else if (tb[IPSET_ATTR_CIDR]) {
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u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
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if (cidr > 32)
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return -IPSET_ERR_INVALID_CIDR;
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ip_set_mask_from_to(ip, ip_to, cidr);
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} else
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ip_to = ip;
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hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
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if (retried)
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ip = h->next.ip;
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for (; !before(ip_to, ip); ip += hosts) {
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nip = htonl(ip);
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if (nip == 0)
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return -IPSET_ERR_HASH_ELEM;
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ret = adtfn(set, &nip, timeout, flags);
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if (ret && !ip_set_eexist(ret, flags))
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return ret;
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else
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ret = 0;
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}
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return ret;
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}
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static bool
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hash_ip_same_set(const struct ip_set *a, const struct ip_set *b)
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{
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const struct ip_set_hash *x = a->data;
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const struct ip_set_hash *y = b->data;
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/* Resizing changes htable_bits, so we ignore it */
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return x->maxelem == y->maxelem &&
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x->timeout == y->timeout &&
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x->netmask == y->netmask;
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}
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/* The type variant functions: IPv6 */
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struct hash_ip6_elem {
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union nf_inet_addr ip;
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};
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struct hash_ip6_telem {
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union nf_inet_addr ip;
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unsigned long timeout;
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};
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static inline bool
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hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
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const struct hash_ip6_elem *ip2,
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u32 *multi)
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{
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return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0;
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}
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static inline bool
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hash_ip6_data_isnull(const struct hash_ip6_elem *elem)
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{
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return ipv6_addr_any(&elem->ip.in6);
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}
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static inline void
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hash_ip6_data_copy(struct hash_ip6_elem *dst, const struct hash_ip6_elem *src)
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{
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ipv6_addr_copy(&dst->ip.in6, &src->ip.in6);
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}
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static inline void
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hash_ip6_data_zero_out(struct hash_ip6_elem *elem)
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{
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ipv6_addr_set(&elem->ip.in6, 0, 0, 0, 0);
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}
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static inline void
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ip6_netmask(union nf_inet_addr *ip, u8 prefix)
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{
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ip->ip6[0] &= ip_set_netmask6(prefix)[0];
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ip->ip6[1] &= ip_set_netmask6(prefix)[1];
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ip->ip6[2] &= ip_set_netmask6(prefix)[2];
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ip->ip6[3] &= ip_set_netmask6(prefix)[3];
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}
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static bool
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hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *data)
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{
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NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &data->ip);
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return 0;
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nla_put_failure:
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return 1;
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}
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static bool
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hash_ip6_data_tlist(struct sk_buff *skb, const struct hash_ip6_elem *data)
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{
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const struct hash_ip6_telem *e =
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(const struct hash_ip6_telem *)data;
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NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &e->ip);
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NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,
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htonl(ip_set_timeout_get(e->timeout)));
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return 0;
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nla_put_failure:
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return 1;
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}
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#undef PF
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#undef HOST_MASK
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#define PF 6
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#define HOST_MASK 128
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#include <linux/netfilter/ipset/ip_set_ahash.h>
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static inline void
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hash_ip6_data_next(struct ip_set_hash *h, const struct hash_ip6_elem *d)
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{
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}
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static int
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hash_ip6_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, const struct ip_set_adt_opt *opt)
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{
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const struct ip_set_hash *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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union nf_inet_addr ip;
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ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip.in6);
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ip6_netmask(&ip, h->netmask);
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if (ipv6_addr_any(&ip.in6))
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return -EINVAL;
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return adtfn(set, &ip, opt_timeout(opt, h), opt->cmdflags);
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}
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static const struct nla_policy hash_ip6_adt_policy[IPSET_ATTR_ADT_MAX + 1] = {
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[IPSET_ATTR_IP] = { .type = NLA_NESTED },
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[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
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[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
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};
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static int
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hash_ip6_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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const struct ip_set_hash *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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union nf_inet_addr ip;
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u32 timeout = h->timeout;
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int ret;
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if (unlikely(!tb[IPSET_ATTR_IP] ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
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tb[IPSET_ATTR_IP_TO] ||
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tb[IPSET_ATTR_CIDR]))
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return -IPSET_ERR_PROTOCOL;
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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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ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &ip);
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if (ret)
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return ret;
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ip6_netmask(&ip, h->netmask);
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if (ipv6_addr_any(&ip.in6))
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return -IPSET_ERR_HASH_ELEM;
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if (tb[IPSET_ATTR_TIMEOUT]) {
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if (!with_timeout(h->timeout))
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return -IPSET_ERR_TIMEOUT;
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timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
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}
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ret = adtfn(set, &ip, timeout, flags);
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return ip_set_eexist(ret, flags) ? 0 : ret;
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}
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/* Create hash:ip type of sets */
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static int
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hash_ip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
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{
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u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
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u8 netmask, hbits;
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struct ip_set_hash *h;
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if (!(set->family == AF_INET || set->family == AF_INET6))
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return -IPSET_ERR_INVALID_FAMILY;
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netmask = set->family == AF_INET ? 32 : 128;
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pr_debug("Create set %s with family %s\n",
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set->name, set->family == AF_INET ? "inet" : "inet6");
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if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
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return -IPSET_ERR_PROTOCOL;
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if (tb[IPSET_ATTR_HASHSIZE]) {
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hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
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if (hashsize < IPSET_MIMINAL_HASHSIZE)
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hashsize = IPSET_MIMINAL_HASHSIZE;
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}
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if (tb[IPSET_ATTR_MAXELEM])
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maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
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if (tb[IPSET_ATTR_NETMASK]) {
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netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
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if ((set->family == AF_INET && netmask > 32) ||
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(set->family == AF_INET6 && netmask > 128) ||
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netmask == 0)
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return -IPSET_ERR_INVALID_NETMASK;
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}
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h = kzalloc(sizeof(*h), GFP_KERNEL);
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if (!h)
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return -ENOMEM;
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h->maxelem = maxelem;
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h->netmask = netmask;
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get_random_bytes(&h->initval, sizeof(h->initval));
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h->timeout = IPSET_NO_TIMEOUT;
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hbits = htable_bits(hashsize);
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h->table = ip_set_alloc(
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sizeof(struct htable)
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+ jhash_size(hbits) * sizeof(struct hbucket));
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if (!h->table) {
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kfree(h);
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return -ENOMEM;
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}
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h->table->htable_bits = hbits;
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set->data = h;
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if (tb[IPSET_ATTR_TIMEOUT]) {
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h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
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set->variant = set->family == AF_INET
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? &hash_ip4_tvariant : &hash_ip6_tvariant;
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if (set->family == AF_INET)
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hash_ip4_gc_init(set);
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else
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hash_ip6_gc_init(set);
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} else {
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set->variant = set->family == AF_INET
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? &hash_ip4_variant : &hash_ip6_variant;
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}
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pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
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set->name, jhash_size(h->table->htable_bits),
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h->table->htable_bits, h->maxelem, set->data, h->table);
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return 0;
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}
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static struct ip_set_type hash_ip_type __read_mostly = {
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.name = "hash:ip",
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.protocol = IPSET_PROTOCOL,
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.features = IPSET_TYPE_IP,
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.dimension = IPSET_DIM_ONE,
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.family = AF_UNSPEC,
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.revision_min = 0,
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.revision_max = 0,
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.create = hash_ip_create,
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.create_policy = {
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[IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
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[IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
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[IPSET_ATTR_PROBES] = { .type = NLA_U8 },
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[IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
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[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
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[IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
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},
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.adt_policy = {
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[IPSET_ATTR_IP] = { .type = NLA_NESTED },
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[IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
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[IPSET_ATTR_CIDR] = { .type = NLA_U8 },
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[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
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[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
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},
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.me = THIS_MODULE,
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};
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static int __init
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hash_ip_init(void)
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{
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return ip_set_type_register(&hash_ip_type);
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}
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static void __exit
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hash_ip_fini(void)
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{
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ip_set_type_unregister(&hash_ip_type);
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}
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module_init(hash_ip_init);
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module_exit(hash_ip_fini);
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