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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
668 lines
16 KiB
C
668 lines
16 KiB
C
/* 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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* 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 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_timeout.h>
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#include <linux/netfilter/ipset/ip_set_bitmap.h>
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#define REVISION_MIN 0
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#define REVISION_MAX 0
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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IP_SET_MODULE_DESC("bitmap:ip,mac", REVISION_MIN, REVISION_MAX);
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MODULE_ALIAS("ip_set_bitmap:ip,mac");
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enum {
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MAC_EMPTY, /* element is not set */
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MAC_FILLED, /* element is set with MAC */
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MAC_UNSET, /* element is set, without MAC */
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};
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/* Type structure */
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struct bitmap_ipmac {
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void *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 timeout; /* timeout value */
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struct timer_list gc; /* garbage collector */
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size_t dsize; /* size of element */
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};
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/* ADT structure for generic function args */
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struct ipmac {
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u32 id; /* id in array */
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unsigned char *ether; /* ethernet address */
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};
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/* Member element without and with timeout */
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struct ipmac_elem {
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unsigned char ether[ETH_ALEN];
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unsigned char match;
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} __attribute__ ((aligned));
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struct ipmac_telem {
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unsigned char ether[ETH_ALEN];
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unsigned char match;
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unsigned long timeout;
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} __attribute__ ((aligned));
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static inline void *
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bitmap_ipmac_elem(const struct bitmap_ipmac *map, u32 id)
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{
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return (void *)((char *)map->members + id * map->dsize);
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}
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static inline bool
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bitmap_timeout(const struct bitmap_ipmac *map, u32 id)
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{
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const struct ipmac_telem *elem = bitmap_ipmac_elem(map, id);
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return ip_set_timeout_test(elem->timeout);
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}
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static inline bool
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bitmap_expired(const struct bitmap_ipmac *map, u32 id)
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{
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const struct ipmac_telem *elem = bitmap_ipmac_elem(map, id);
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return ip_set_timeout_expired(elem->timeout);
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}
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static inline int
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bitmap_ipmac_exist(const struct ipmac_telem *elem)
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{
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return elem->match == MAC_UNSET ||
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(elem->match == MAC_FILLED &&
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!ip_set_timeout_expired(elem->timeout));
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}
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/* Base variant */
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static int
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bitmap_ipmac_test(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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const struct bitmap_ipmac *map = set->data;
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const struct ipmac *data = value;
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const struct ipmac_elem *elem = bitmap_ipmac_elem(map, data->id);
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switch (elem->match) {
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case MAC_UNSET:
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/* Trigger kernel to fill out the ethernet address */
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return -EAGAIN;
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case MAC_FILLED:
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return data->ether == NULL ||
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ether_addr_equal(data->ether, elem->ether);
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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_add(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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struct bitmap_ipmac *map = set->data;
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const struct ipmac *data = value;
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struct ipmac_elem *elem = bitmap_ipmac_elem(map, data->id);
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switch (elem->match) {
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case MAC_UNSET:
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if (!data->ether)
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/* Already added without ethernet address */
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return -IPSET_ERR_EXIST;
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/* Fill the MAC address */
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memcpy(elem->ether, data->ether, ETH_ALEN);
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elem->match = MAC_FILLED;
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break;
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case MAC_FILLED:
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return -IPSET_ERR_EXIST;
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case MAC_EMPTY:
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if (data->ether) {
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memcpy(elem->ether, data->ether, ETH_ALEN);
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elem->match = MAC_FILLED;
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} else
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elem->match = MAC_UNSET;
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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_del(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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struct bitmap_ipmac *map = set->data;
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const struct ipmac *data = value;
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struct ipmac_elem *elem = bitmap_ipmac_elem(map, data->id);
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if (elem->match == MAC_EMPTY)
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return -IPSET_ERR_EXIST;
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elem->match = MAC_EMPTY;
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return 0;
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}
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static int
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bitmap_ipmac_list(const struct ip_set *set,
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struct sk_buff *skb, struct netlink_callback *cb)
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{
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const struct bitmap_ipmac *map = set->data;
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const struct ipmac_elem *elem;
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struct nlattr *atd, *nested;
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u32 id, first = cb->args[2];
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u32 last = map->last_ip - map->first_ip;
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atd = ipset_nest_start(skb, IPSET_ATTR_ADT);
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if (!atd)
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return -EMSGSIZE;
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for (; cb->args[2] <= last; cb->args[2]++) {
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id = cb->args[2];
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elem = bitmap_ipmac_elem(map, id);
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if (elem->match == MAC_EMPTY)
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continue;
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nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
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if (!nested) {
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if (id == first) {
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nla_nest_cancel(skb, atd);
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return -EMSGSIZE;
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} else
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goto nla_put_failure;
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}
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if (nla_put_ipaddr4(skb, IPSET_ATTR_IP,
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htonl(map->first_ip + id)) ||
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(elem->match == MAC_FILLED &&
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nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN,
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elem->ether)))
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goto nla_put_failure;
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ipset_nest_end(skb, nested);
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}
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ipset_nest_end(skb, atd);
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/* Set listing finished */
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cb->args[2] = 0;
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return 0;
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nla_put_failure:
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nla_nest_cancel(skb, nested);
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ipset_nest_end(skb, atd);
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if (unlikely(id == first)) {
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cb->args[2] = 0;
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return -EMSGSIZE;
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}
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return 0;
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}
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/* Timeout variant */
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static int
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bitmap_ipmac_ttest(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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const struct bitmap_ipmac *map = set->data;
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const struct ipmac *data = value;
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const struct ipmac_elem *elem = bitmap_ipmac_elem(map, data->id);
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switch (elem->match) {
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case MAC_UNSET:
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/* Trigger kernel to fill out the ethernet address */
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return -EAGAIN;
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case MAC_FILLED:
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return (data->ether == NULL ||
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ether_addr_equal(data->ether, elem->ether)) &&
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!bitmap_expired(map, data->id);
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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_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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struct bitmap_ipmac *map = set->data;
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const struct ipmac *data = value;
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struct ipmac_telem *elem = bitmap_ipmac_elem(map, data->id);
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bool flag_exist = flags & IPSET_FLAG_EXIST;
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switch (elem->match) {
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case MAC_UNSET:
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if (!(data->ether || flag_exist))
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/* Already added without ethernet address */
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return -IPSET_ERR_EXIST;
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/* Fill the MAC address and activate the timer */
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memcpy(elem->ether, data->ether, ETH_ALEN);
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elem->match = MAC_FILLED;
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if (timeout == map->timeout)
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/* Timeout was not specified, get stored one */
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timeout = elem->timeout;
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elem->timeout = ip_set_timeout_set(timeout);
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break;
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case MAC_FILLED:
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if (!(bitmap_expired(map, data->id) || flag_exist))
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return -IPSET_ERR_EXIST;
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/* Fall through */
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case MAC_EMPTY:
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if (data->ether) {
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memcpy(elem->ether, data->ether, ETH_ALEN);
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elem->match = MAC_FILLED;
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} else
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elem->match = MAC_UNSET;
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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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elem->timeout = data->ether ? ip_set_timeout_set(timeout)
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: timeout;
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break;
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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_tdel(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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struct bitmap_ipmac *map = set->data;
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const struct ipmac *data = value;
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struct ipmac_telem *elem = bitmap_ipmac_elem(map, data->id);
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if (elem->match == MAC_EMPTY || bitmap_expired(map, data->id))
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return -IPSET_ERR_EXIST;
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elem->match = MAC_EMPTY;
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return 0;
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}
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static int
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bitmap_ipmac_tlist(const struct ip_set *set,
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struct sk_buff *skb, struct netlink_callback *cb)
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{
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const struct bitmap_ipmac *map = set->data;
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const struct ipmac_telem *elem;
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struct nlattr *atd, *nested;
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u32 id, first = cb->args[2];
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u32 timeout, last = map->last_ip - map->first_ip;
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atd = ipset_nest_start(skb, IPSET_ATTR_ADT);
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if (!atd)
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return -EMSGSIZE;
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for (; cb->args[2] <= last; cb->args[2]++) {
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id = cb->args[2];
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elem = bitmap_ipmac_elem(map, id);
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if (!bitmap_ipmac_exist(elem))
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continue;
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nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
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if (!nested) {
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if (id == first) {
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nla_nest_cancel(skb, atd);
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return -EMSGSIZE;
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} else
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goto nla_put_failure;
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}
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if (nla_put_ipaddr4(skb, IPSET_ATTR_IP,
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htonl(map->first_ip + id)) ||
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(elem->match == MAC_FILLED &&
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nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN,
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elem->ether)))
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goto nla_put_failure;
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timeout = elem->match == MAC_UNSET ? elem->timeout
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: ip_set_timeout_get(elem->timeout);
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if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT, htonl(timeout)))
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goto nla_put_failure;
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ipset_nest_end(skb, nested);
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}
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ipset_nest_end(skb, atd);
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/* Set listing finished */
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cb->args[2] = 0;
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return 0;
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nla_put_failure:
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nla_nest_cancel(skb, nested);
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ipset_nest_end(skb, atd);
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return -EMSGSIZE;
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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, const 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 ipmac data;
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/* MAC can be src only */
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if (!(opt->flags & IPSET_DIM_TWO_SRC))
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return 0;
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data.id = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC));
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if (data.id < map->first_ip || data.id > 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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data.id -= map->first_ip;
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data.ether = eth_hdr(skb)->h_source;
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return adtfn(set, &data, opt_timeout(opt, map), 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 ipmac data;
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u32 timeout = map->timeout;
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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], &data.id);
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if (ret)
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return ret;
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if (data.id < map->first_ip || data.id > map->last_ip)
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return -IPSET_ERR_BITMAP_RANGE;
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if (tb[IPSET_ATTR_ETHER])
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data.ether = nla_data(tb[IPSET_ATTR_ETHER]);
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else
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data.ether = NULL;
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if (tb[IPSET_ATTR_TIMEOUT]) {
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if (!with_timeout(map->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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data.id -= map->first_ip;
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ret = adtfn(set, &data, timeout, flags);
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return ip_set_eexist(ret, flags) ? 0 : ret;
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}
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static void
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bitmap_ipmac_destroy(struct ip_set *set)
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{
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struct bitmap_ipmac *map = set->data;
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if (with_timeout(map->timeout))
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del_timer_sync(&map->gc);
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ip_set_free(map->members);
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kfree(map);
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set->data = NULL;
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}
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static void
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bitmap_ipmac_flush(struct ip_set *set)
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{
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struct bitmap_ipmac *map = set->data;
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memset(map->members, 0,
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(map->last_ip - map->first_ip + 1) * map->dsize);
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}
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static int
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bitmap_ipmac_head(struct ip_set *set, struct sk_buff *skb)
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{
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const struct bitmap_ipmac *map = set->data;
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struct nlattr *nested;
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nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
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if (!nested)
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goto nla_put_failure;
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if (nla_put_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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nla_put_net32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1)) ||
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nla_put_net32(skb, IPSET_ATTR_MEMSIZE,
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htonl(sizeof(*map) +
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((map->last_ip - map->first_ip + 1) *
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map->dsize))) ||
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(with_timeout(map->timeout) &&
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nla_put_net32(skb, IPSET_ATTR_TIMEOUT, htonl(map->timeout))))
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goto nla_put_failure;
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ipset_nest_end(skb, nested);
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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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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x->timeout == y->timeout;
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}
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static const struct ip_set_type_variant bitmap_ipmac = {
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.kadt = bitmap_ipmac_kadt,
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.uadt = bitmap_ipmac_uadt,
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.adt = {
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[IPSET_ADD] = bitmap_ipmac_add,
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[IPSET_DEL] = bitmap_ipmac_del,
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[IPSET_TEST] = bitmap_ipmac_test,
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},
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.destroy = bitmap_ipmac_destroy,
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.flush = bitmap_ipmac_flush,
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.head = bitmap_ipmac_head,
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.list = bitmap_ipmac_list,
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.same_set = bitmap_ipmac_same_set,
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};
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static const struct ip_set_type_variant bitmap_tipmac = {
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.kadt = bitmap_ipmac_kadt,
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.uadt = bitmap_ipmac_uadt,
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.adt = {
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[IPSET_ADD] = bitmap_ipmac_tadd,
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[IPSET_DEL] = bitmap_ipmac_tdel,
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[IPSET_TEST] = bitmap_ipmac_ttest,
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},
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.destroy = bitmap_ipmac_destroy,
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.flush = bitmap_ipmac_flush,
|
|
.head = bitmap_ipmac_head,
|
|
.list = bitmap_ipmac_tlist,
|
|
.same_set = bitmap_ipmac_same_set,
|
|
};
|
|
|
|
static void
|
|
bitmap_ipmac_gc(unsigned long ul_set)
|
|
{
|
|
struct ip_set *set = (struct ip_set *) ul_set;
|
|
struct bitmap_ipmac *map = set->data;
|
|
struct ipmac_telem *elem;
|
|
u32 id, last = map->last_ip - map->first_ip;
|
|
|
|
/* We run parallel with other readers (test element)
|
|
* but adding/deleting new entries is locked out */
|
|
read_lock_bh(&set->lock);
|
|
for (id = 0; id <= last; id++) {
|
|
elem = bitmap_ipmac_elem(map, id);
|
|
if (elem->match == MAC_FILLED &&
|
|
ip_set_timeout_expired(elem->timeout))
|
|
elem->match = MAC_EMPTY;
|
|
}
|
|
read_unlock_bh(&set->lock);
|
|
|
|
map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
|
|
add_timer(&map->gc);
|
|
}
|
|
|
|
static void
|
|
bitmap_ipmac_gc_init(struct ip_set *set)
|
|
{
|
|
struct bitmap_ipmac *map = set->data;
|
|
|
|
init_timer(&map->gc);
|
|
map->gc.data = (unsigned long) set;
|
|
map->gc.function = bitmap_ipmac_gc;
|
|
map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
|
|
add_timer(&map->gc);
|
|
}
|
|
|
|
/* Create bitmap:ip,mac type of sets */
|
|
|
|
static bool
|
|
init_map_ipmac(struct ip_set *set, struct bitmap_ipmac *map,
|
|
u32 first_ip, u32 last_ip)
|
|
{
|
|
map->members = ip_set_alloc((last_ip - first_ip + 1) * map->dsize);
|
|
if (!map->members)
|
|
return false;
|
|
map->first_ip = first_ip;
|
|
map->last_ip = last_ip;
|
|
map->timeout = IPSET_NO_TIMEOUT;
|
|
|
|
set->data = map;
|
|
set->family = NFPROTO_IPV4;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int
|
|
bitmap_ipmac_create(struct ip_set *set, struct nlattr *tb[],
|
|
u32 flags)
|
|
{
|
|
u32 first_ip, last_ip;
|
|
u64 elements;
|
|
struct bitmap_ipmac *map;
|
|
int ret;
|
|
|
|
if (unlikely(!tb[IPSET_ATTR_IP] ||
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (tb[IPSET_ATTR_IP_TO]) {
|
|
ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip);
|
|
if (ret)
|
|
return ret;
|
|
if (first_ip > last_ip) {
|
|
u32 tmp = first_ip;
|
|
|
|
first_ip = last_ip;
|
|
last_ip = tmp;
|
|
}
|
|
} else if (tb[IPSET_ATTR_CIDR]) {
|
|
u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
|
|
|
|
if (cidr >= 32)
|
|
return -IPSET_ERR_INVALID_CIDR;
|
|
ip_set_mask_from_to(first_ip, last_ip, cidr);
|
|
} else
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
elements = (u64)last_ip - first_ip + 1;
|
|
|
|
if (elements > IPSET_BITMAP_MAX_RANGE + 1)
|
|
return -IPSET_ERR_BITMAP_RANGE_SIZE;
|
|
|
|
map = kzalloc(sizeof(*map), GFP_KERNEL);
|
|
if (!map)
|
|
return -ENOMEM;
|
|
|
|
if (tb[IPSET_ATTR_TIMEOUT]) {
|
|
map->dsize = sizeof(struct ipmac_telem);
|
|
|
|
if (!init_map_ipmac(set, map, first_ip, last_ip)) {
|
|
kfree(map);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
map->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
|
|
|
|
set->variant = &bitmap_tipmac;
|
|
|
|
bitmap_ipmac_gc_init(set);
|
|
} else {
|
|
map->dsize = sizeof(struct ipmac_elem);
|
|
|
|
if (!init_map_ipmac(set, map, first_ip, last_ip)) {
|
|
kfree(map);
|
|
return -ENOMEM;
|
|
}
|
|
set->variant = &bitmap_ipmac;
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct ip_set_type bitmap_ipmac_type = {
|
|
.name = "bitmap:ip,mac",
|
|
.protocol = IPSET_PROTOCOL,
|
|
.features = IPSET_TYPE_IP | IPSET_TYPE_MAC,
|
|
.dimension = IPSET_DIM_TWO,
|
|
.family = NFPROTO_IPV4,
|
|
.revision_min = REVISION_MIN,
|
|
.revision_max = REVISION_MAX,
|
|
.create = bitmap_ipmac_create,
|
|
.create_policy = {
|
|
[IPSET_ATTR_IP] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_CIDR] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
},
|
|
.adt_policy = {
|
|
[IPSET_ATTR_IP] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_ETHER] = { .type = NLA_BINARY,
|
|
.len = ETH_ALEN },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
},
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init
|
|
bitmap_ipmac_init(void)
|
|
{
|
|
return ip_set_type_register(&bitmap_ipmac_type);
|
|
}
|
|
|
|
static void __exit
|
|
bitmap_ipmac_fini(void)
|
|
{
|
|
ip_set_type_unregister(&bitmap_ipmac_type);
|
|
}
|
|
|
|
module_init(bitmap_ipmac_init);
|
|
module_exit(bitmap_ipmac_fini);
|