// 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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* Martin Josefsson <gandalf@wlug.westbo.se>
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*/
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/* Kernel module implementing an IP set type: the bitmap:ip,mac type */
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#include <linux/module.h>
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#include <linux/ip.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/if_ether.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 <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,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
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MODULE_ALIAS("ip_set_bitmap:ip,mac");
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#define MTYPE bitmap_ipmac
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#define HOST_MASK 32
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#define IP_SET_BITMAP_STORED_TIMEOUT
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enum {
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MAC_UNSET, /* element is set, without MAC */
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MAC_FILLED, /* element is set with MAC */
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};
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/* Type structure */
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struct bitmap_ipmac {
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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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size_t memsize; /* members size */
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struct timer_list gc; /* garbage collector */
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struct ip_set *set; /* attached to this ip_set */
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unsigned char extensions[] /* MAC + 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_ipmac_adt_elem {
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unsigned char ether[ETH_ALEN] __aligned(2);
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u16 id;
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u16 add_mac;
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};
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struct bitmap_ipmac_elem {
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unsigned char ether[ETH_ALEN];
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unsigned char filled;
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} __aligned(__alignof__(u64));
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static u32
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ip_to_id(const struct bitmap_ipmac *m, u32 ip)
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{
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return ip - m->first_ip;
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}
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#define get_elem(extensions, id, dsize) \
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(struct bitmap_ipmac_elem *)(extensions + (id) * (dsize))
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#define get_const_elem(extensions, id, dsize) \
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(const struct bitmap_ipmac_elem *)(extensions + (id) * (dsize))
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/* Common functions */
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static int
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bitmap_ipmac_do_test(const struct bitmap_ipmac_adt_elem *e,
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const struct bitmap_ipmac *map, size_t dsize)
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{
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const struct bitmap_ipmac_elem *elem;
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if (!test_bit(e->id, map->members))
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return 0;
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elem = get_const_elem(map->extensions, e->id, dsize);
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if (e->add_mac && elem->filled == MAC_FILLED)
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return ether_addr_equal(e->ether, elem->ether);
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/* Trigger kernel to fill out the ethernet address */
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return -EAGAIN;
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}
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static int
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bitmap_ipmac_gc_test(u16 id, const struct bitmap_ipmac *map, size_t dsize)
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{
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const struct bitmap_ipmac_elem *elem;
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if (!test_bit(id, map->members))
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return 0;
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elem = get_const_elem(map->extensions, id, dsize);
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/* Timer not started for the incomplete elements */
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return elem->filled == MAC_FILLED;
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}
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static int
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bitmap_ipmac_is_filled(const struct bitmap_ipmac_elem *elem)
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{
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return elem->filled == MAC_FILLED;
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}
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static int
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bitmap_ipmac_add_timeout(unsigned long *timeout,
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const struct bitmap_ipmac_adt_elem *e,
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const struct ip_set_ext *ext, struct ip_set *set,
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struct bitmap_ipmac *map, int mode)
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{
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u32 t = ext->timeout;
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if (mode == IPSET_ADD_START_STORED_TIMEOUT) {
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if (t == set->timeout)
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/* Timeout was not specified, get stored one */
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t = *timeout;
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ip_set_timeout_set(timeout, t);
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} else {
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/* If MAC is unset yet, we store plain timeout value
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* because the timer is not activated yet
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* and we can reuse it later when MAC is filled out,
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* possibly by the kernel
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*/
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if (e->add_mac)
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ip_set_timeout_set(timeout, t);
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else
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*timeout = t;
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}
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return 0;
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}
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static int
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bitmap_ipmac_do_add(const struct bitmap_ipmac_adt_elem *e,
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struct bitmap_ipmac *map, u32 flags, size_t dsize)
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{
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struct bitmap_ipmac_elem *elem;
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elem = get_elem(map->extensions, e->id, dsize);
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if (test_bit(e->id, map->members)) {
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if (elem->filled == MAC_FILLED) {
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if (e->add_mac &&
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(flags & IPSET_FLAG_EXIST) &&
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!ether_addr_equal(e->ether, elem->ether)) {
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/* memcpy isn't atomic */
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clear_bit(e->id, map->members);
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smp_mb__after_atomic();
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ether_addr_copy(elem->ether, e->ether);
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}
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return IPSET_ADD_FAILED;
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} else if (!e->add_mac)
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/* Already added without ethernet address */
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return IPSET_ADD_FAILED;
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/* Fill the MAC address and trigger the timer activation */
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clear_bit(e->id, map->members);
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smp_mb__after_atomic();
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ether_addr_copy(elem->ether, e->ether);
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elem->filled = MAC_FILLED;
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return IPSET_ADD_START_STORED_TIMEOUT;
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} else if (e->add_mac) {
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/* We can store MAC too */
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ether_addr_copy(elem->ether, e->ether);
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elem->filled = MAC_FILLED;
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return 0;
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}
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elem->filled = MAC_UNSET;
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/* MAC is not stored yet, don't start timer */
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return IPSET_ADD_STORE_PLAIN_TIMEOUT;
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}
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static int
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bitmap_ipmac_do_del(const struct bitmap_ipmac_adt_elem *e,
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struct bitmap_ipmac *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_ipmac_do_list(struct sk_buff *skb, const struct bitmap_ipmac *map,
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u32 id, size_t dsize)
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{
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const struct bitmap_ipmac_elem *elem =
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get_const_elem(map->extensions, id, dsize);
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return nla_put_ipaddr4(skb, IPSET_ATTR_IP,
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htonl(map->first_ip + id)) ||
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(elem->filled == MAC_FILLED &&
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nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, elem->ether));
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}
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static int
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bitmap_ipmac_do_head(struct sk_buff *skb, const struct bitmap_ipmac *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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}
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static int
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bitmap_ipmac_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_ipmac *map = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct bitmap_ipmac_adt_elem e = { .id = 0, .add_mac = 1 };
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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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/* Backward compatibility: we don't check the second flag */
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if (skb_mac_header(skb) < skb->head ||
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(skb_mac_header(skb) + ETH_HLEN) > skb->data)
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return -EINVAL;
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e.id = ip_to_id(map, ip);
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if (opt->flags & IPSET_DIM_TWO_SRC)
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ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
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else
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ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
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if (is_zero_ether_addr(e.ether))
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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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bitmap_ipmac_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 bitmap_ipmac *map = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct bitmap_ipmac_adt_elem e = { .id = 0 };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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u32 ip = 0;
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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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e.id = ip_to_id(map, ip);
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if (tb[IPSET_ATTR_ETHER]) {
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if (nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN)
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return -IPSET_ERR_PROTOCOL;
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memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
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e.add_mac = 1;
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}
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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 bool
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bitmap_ipmac_same_set(const struct ip_set *a, const struct ip_set *b)
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{
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const struct bitmap_ipmac *x = a->data;
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const struct bitmap_ipmac *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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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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#include "ip_set_bitmap_gen.h"
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/* Create bitmap:ip,mac type of sets */
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static bool
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init_map_ipmac(struct ip_set *set, struct bitmap_ipmac *map,
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u32 first_ip, u32 last_ip, u32 elements)
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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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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 int
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bitmap_ipmac_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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u32 first_ip = 0, last_ip = 0;
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u64 elements;
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struct bitmap_ipmac *map;
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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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elements = (u64)last_ip - first_ip + 1;
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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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set->dsize = ip_set_elem_len(set, tb,
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sizeof(struct bitmap_ipmac_elem),
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__alignof__(struct bitmap_ipmac_elem));
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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_ipmac;
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if (!init_map_ipmac(set, map, first_ip, last_ip, elements)) {
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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_ipmac_gc_init(set, bitmap_ipmac_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_ipmac_type = {
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.name = "bitmap:ip,mac",
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.protocol = IPSET_PROTOCOL,
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.features = IPSET_TYPE_IP | IPSET_TYPE_MAC,
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.dimension = IPSET_DIM_TWO,
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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_ipmac_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_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_ETHER] = { .type = NLA_BINARY,
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.len = ETH_ALEN },
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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_ipmac_init(void)
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{
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return ip_set_type_register(&bitmap_ipmac_type);
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}
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static void __exit
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bitmap_ipmac_fini(void)
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{
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rcu_barrier();
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ip_set_type_unregister(&bitmap_ipmac_type);
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}
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module_init(bitmap_ipmac_init);
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module_exit(bitmap_ipmac_fini);
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