// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */
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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_hash.h>
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#define IPSET_TYPE_REV_MIN 0
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/* 1 Counters support */
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/* 2 Comments support */
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/* 3 Forceadd support */
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#define IPSET_TYPE_REV_MAX 4 /* skbinfo support */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
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IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
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MODULE_ALIAS("ip_set_hash:ip");
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/* Type specific function prefix */
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#define HTYPE hash_ip
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#define IP_SET_HASH_WITH_NETMASK
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/* IPv4 variant */
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/* Member elements */
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struct hash_ip4_elem {
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/* Zero valued IP addresses cannot be stored */
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__be32 ip;
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};
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/* Common functions */
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static bool
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hash_ip4_data_equal(const struct hash_ip4_elem *e1,
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const struct hash_ip4_elem *e2,
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u32 *multi)
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{
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return e1->ip == e2->ip;
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}
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static bool
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hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
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{
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if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
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goto nla_put_failure;
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return false;
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nla_put_failure:
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return true;
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}
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static void
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hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
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{
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next->ip = e->ip;
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}
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#define MTYPE hash_ip4
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#define HOST_MASK 32
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#include "ip_set_hash_gen.h"
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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, struct ip_set_adt_opt *opt)
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{
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const struct hash_ip4 *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_ip4_elem e = { 0 };
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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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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e.ip = ip;
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return adtfn(set, &e, &ext, &opt->ext, 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 hash_ip4 *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_ip4_elem e = { 0 };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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u32 ip = 0, ip_to = 0, hosts;
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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_IP]))
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return -IPSET_ERR_PROTOCOL;
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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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ret = ip_set_get_extensions(set, tb, &ext);
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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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e.ip = htonl(ip);
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if (e.ip == 0)
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return -IPSET_ERR_HASH_ELEM;
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if (adt == IPSET_TEST)
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return adtfn(set, &e, &ext, &ext, flags);
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ip_to = ip;
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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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if (ip_to == 0)
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return -IPSET_ERR_HASH_ELEM;
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swap(ip, ip_to);
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}
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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 || cidr > HOST_MASK)
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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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}
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hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
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/* 64bit division is not allowed on 32bit */
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if (((u64)ip_to - ip + 1) >> (32 - h->netmask) > IPSET_MAX_RANGE)
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return -ERANGE;
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if (retried)
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ip = ntohl(h->next.ip);
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for (; ip <= ip_to;) {
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e.ip = htonl(ip);
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ret = adtfn(set, &e, &ext, &ext, flags);
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if (ret && !ip_set_eexist(ret, flags))
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return ret;
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ip += hosts;
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if (ip == 0)
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return 0;
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ret = 0;
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}
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return ret;
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}
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/* IPv6 variant */
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/* Member elements */
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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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/* Common functions */
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static 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_equal(&ip1->ip.in6, &ip2->ip.in6);
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}
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static void
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hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
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{
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ip6_netmask(ip, prefix);
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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 *e)
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{
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if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
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goto nla_put_failure;
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return false;
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nla_put_failure:
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return true;
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}
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static void
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hash_ip6_data_next(struct hash_ip6_elem *next, const struct hash_ip6_elem *e)
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{
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}
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#undef MTYPE
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#undef HOST_MASK
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#define MTYPE hash_ip6
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#define HOST_MASK 128
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#define IP_SET_EMIT_CREATE
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#include "ip_set_hash_gen.h"
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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, struct ip_set_adt_opt *opt)
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{
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const struct hash_ip6 *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_ip6_elem e = { { .all = { 0 } } };
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
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hash_ip6_netmask(&e.ip, h->netmask);
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if (ipv6_addr_any(&e.ip.in6))
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return -EINVAL;
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return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
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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 hash_ip6 *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_ip6_elem e = { { .all = { 0 } } };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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int ret;
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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_IP]))
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return -IPSET_ERR_PROTOCOL;
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if (unlikely(tb[IPSET_ATTR_IP_TO]))
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return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
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if (unlikely(tb[IPSET_ATTR_CIDR])) {
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u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
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if (cidr != HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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}
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ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
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if (ret)
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return ret;
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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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hash_ip6_netmask(&e.ip, h->netmask);
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if (ipv6_addr_any(&e.ip.in6))
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return -IPSET_ERR_HASH_ELEM;
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ret = adtfn(set, &e, &ext, &ext, flags);
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return ip_set_eexist(ret, flags) ? 0 : ret;
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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 = NFPROTO_UNSPEC,
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.revision_min = IPSET_TYPE_REV_MIN,
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.revision_max = IPSET_TYPE_REV_MAX,
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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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[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
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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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[IPSET_ATTR_BYTES] = { .type = NLA_U64 },
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[IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
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[IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
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.len = IPSET_MAX_COMMENT_SIZE },
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[IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
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[IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
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[IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
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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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rcu_barrier();
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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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