// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
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* Patrick Schaaf <bof@bof.de>
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* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org>
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*/
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/* Kernel module implementing an IP set type: the bitmap:ip type */
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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/bitops.h>
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#include <linux/spinlock.h>
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#include <linux/netlink.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <net/netlink.h>
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#include <net/tcp.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_bitmap.h>
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#define IPSET_TYPE_REV_MIN 0
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/* 1 Counter support added */
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/* 2 Comment 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@netfilter.org>");
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IP_SET_MODULE_DESC("bitmap:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
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MODULE_ALIAS("ip_set_bitmap:ip");
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#define MTYPE bitmap_ip
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#define HOST_MASK 32
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/* Type structure */
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struct bitmap_ip {
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unsigned long *members; /* the set members */
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u32 first_ip; /* host byte order, included in range */
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u32 last_ip; /* host byte order, included in range */
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u32 elements; /* number of max elements in the set */
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u32 hosts; /* number of hosts in a subnet */
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size_t memsize; /* members size */
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u8 netmask; /* subnet netmask */
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struct timer_list gc; /* garbage collection */
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struct ip_set *set; /* attached to this ip_set */
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unsigned char extensions[] /* data extensions */
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__aligned(__alignof__(u64));
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};
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/* ADT structure for generic function args */
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struct bitmap_ip_adt_elem {
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u16 id;
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};
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static u32
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ip_to_id(const struct bitmap_ip *m, u32 ip)
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{
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return ((ip & ip_set_hostmask(m->netmask)) - m->first_ip) / m->hosts;
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}
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/* Common functions */
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static int
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bitmap_ip_do_test(const struct bitmap_ip_adt_elem *e,
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struct bitmap_ip *map, size_t dsize)
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{
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return !!test_bit(e->id, map->members);
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}
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static int
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bitmap_ip_gc_test(u16 id, const struct bitmap_ip *map, size_t dsize)
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{
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return !!test_bit(id, map->members);
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}
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static int
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bitmap_ip_do_add(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map,
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u32 flags, size_t dsize)
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{
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return !!test_bit(e->id, map->members);
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}
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static int
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bitmap_ip_do_del(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map)
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{
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return !test_and_clear_bit(e->id, map->members);
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}
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static int
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bitmap_ip_do_list(struct sk_buff *skb, const struct bitmap_ip *map, u32 id,
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size_t dsize)
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{
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return nla_put_ipaddr4(skb, IPSET_ATTR_IP,
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htonl(map->first_ip + id * map->hosts));
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}
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static int
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bitmap_ip_do_head(struct sk_buff *skb, const struct bitmap_ip *map)
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{
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return nla_put_ipaddr4(skb, IPSET_ATTR_IP, htonl(map->first_ip)) ||
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nla_put_ipaddr4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip)) ||
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(map->netmask != 32 &&
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nla_put_u8(skb, IPSET_ATTR_NETMASK, map->netmask));
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}
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static int
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bitmap_ip_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 bitmap_ip *map = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct bitmap_ip_adt_elem e = { .id = 0 };
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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u32 ip;
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ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC));
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if (ip < map->first_ip || ip > map->last_ip)
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return -IPSET_ERR_BITMAP_RANGE;
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e.id = ip_to_id(map, 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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bitmap_ip_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 bitmap_ip *map = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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u32 ip = 0, ip_to = 0;
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struct bitmap_ip_adt_elem e = { .id = 0 };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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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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if (ip < map->first_ip || ip > map->last_ip)
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return -IPSET_ERR_BITMAP_RANGE;
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if (adt == IPSET_TEST) {
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e.id = ip_to_id(map, ip);
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return adtfn(set, &e, &ext, &ext, 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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if (ip < map->first_ip)
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return -IPSET_ERR_BITMAP_RANGE;
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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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} else {
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ip_to = ip;
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}
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if (ip_to > map->last_ip)
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return -IPSET_ERR_BITMAP_RANGE;
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for (; !before(ip_to, ip); ip += map->hosts) {
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e.id = ip_to_id(map, 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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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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bitmap_ip_same_set(const struct ip_set *a, const struct ip_set *b)
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{
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const struct bitmap_ip *x = a->data;
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const struct bitmap_ip *y = b->data;
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return x->first_ip == y->first_ip &&
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x->last_ip == y->last_ip &&
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x->netmask == y->netmask &&
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a->timeout == b->timeout &&
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a->extensions == b->extensions;
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}
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/* Plain variant */
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struct bitmap_ip_elem {
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};
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#include "ip_set_bitmap_gen.h"
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/* Create bitmap:ip type of sets */
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static bool
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init_map_ip(struct ip_set *set, struct bitmap_ip *map,
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u32 first_ip, u32 last_ip,
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u32 elements, u32 hosts, u8 netmask)
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{
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map->members = bitmap_zalloc(elements, GFP_KERNEL | __GFP_NOWARN);
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if (!map->members)
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return false;
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map->first_ip = first_ip;
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map->last_ip = last_ip;
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map->elements = elements;
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map->hosts = hosts;
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map->netmask = netmask;
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set->timeout = IPSET_NO_TIMEOUT;
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map->set = set;
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set->data = map;
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set->family = NFPROTO_IPV4;
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return true;
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}
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static u32
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range_to_mask(u32 from, u32 to, u8 *bits)
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{
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u32 mask = 0xFFFFFFFE;
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*bits = 32;
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while (--(*bits) > 0 && mask && (to & mask) != from)
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mask <<= 1;
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return mask;
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}
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static int
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bitmap_ip_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
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u32 flags)
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{
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struct bitmap_ip *map;
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u32 first_ip = 0, last_ip = 0, hosts;
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u64 elements;
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u8 netmask = 32;
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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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!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_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip);
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if (ret)
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return ret;
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if (tb[IPSET_ATTR_IP_TO]) {
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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip);
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if (ret)
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return ret;
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if (first_ip > last_ip)
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swap(first_ip, last_ip);
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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 >= HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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ip_set_mask_from_to(first_ip, last_ip, cidr);
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} else {
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return -IPSET_ERR_PROTOCOL;
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}
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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 (netmask > HOST_MASK)
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return -IPSET_ERR_INVALID_NETMASK;
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first_ip &= ip_set_hostmask(netmask);
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last_ip |= ~ip_set_hostmask(netmask);
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}
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if (netmask == 32) {
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hosts = 1;
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elements = (u64)last_ip - first_ip + 1;
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} else {
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u8 mask_bits;
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u32 mask;
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mask = range_to_mask(first_ip, last_ip, &mask_bits);
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if ((!mask && (first_ip || last_ip != 0xFFFFFFFF)) ||
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netmask <= mask_bits)
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return -IPSET_ERR_BITMAP_RANGE;
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pr_debug("mask_bits %u, netmask %u\n", mask_bits, netmask);
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hosts = 2 << (32 - netmask - 1);
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elements = 2 << (netmask - mask_bits - 1);
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}
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if (elements > IPSET_BITMAP_MAX_RANGE + 1)
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return -IPSET_ERR_BITMAP_RANGE_SIZE;
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pr_debug("hosts %u, elements %llu\n",
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hosts, (unsigned long long)elements);
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set->dsize = ip_set_elem_len(set, tb, 0, 0);
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map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
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if (!map)
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return -ENOMEM;
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map->memsize = BITS_TO_LONGS(elements) * sizeof(unsigned long);
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set->variant = &bitmap_ip;
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if (!init_map_ip(set, map, first_ip, last_ip,
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elements, hosts, netmask)) {
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ip_set_free(map);
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return -ENOMEM;
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}
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if (tb[IPSET_ATTR_TIMEOUT]) {
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set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
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bitmap_ip_gc_init(set, bitmap_ip_gc);
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}
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return 0;
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}
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static struct ip_set_type bitmap_ip_type __read_mostly = {
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.name = "bitmap: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_IPV4,
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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 = bitmap_ip_create,
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.create_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_NETMASK] = { .type = NLA_U8 },
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[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
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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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bitmap_ip_init(void)
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{
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return ip_set_type_register(&bitmap_ip_type);
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}
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static void __exit
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bitmap_ip_fini(void)
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{
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rcu_barrier();
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ip_set_type_unregister(&bitmap_ip_type);
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}
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module_init(bitmap_ip_init);
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module_exit(bitmap_ip_fini);
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