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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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595 lines
14 KiB
C
595 lines
14 KiB
C
/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
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* Patrick Schaaf <bof@bof.de>
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* Copyright (C) 2003-2011 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 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 IP_SET_BITMAP_TIMEOUT
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#include <linux/netfilter/ipset/ip_set_timeout.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", REVISION_MIN, REVISION_MAX);
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MODULE_ALIAS("ip_set_bitmap:ip");
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/* Type structure */
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struct bitmap_ip {
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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 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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u32 timeout; /* timeout parameter */
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struct timer_list gc; /* garbage collection */
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};
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/* Base variant */
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static inline 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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static int
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bitmap_ip_test(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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const struct bitmap_ip *map = set->data;
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u16 id = *(u16 *)value;
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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_add(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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struct bitmap_ip *map = set->data;
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u16 id = *(u16 *)value;
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if (test_and_set_bit(id, map->members))
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return -IPSET_ERR_EXIST;
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return 0;
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}
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static int
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bitmap_ip_del(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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struct bitmap_ip *map = set->data;
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u16 id = *(u16 *)value;
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if (!test_and_clear_bit(id, map->members))
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return -IPSET_ERR_EXIST;
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return 0;
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}
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static int
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bitmap_ip_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_ip *map = set->data;
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struct nlattr *atd, *nested;
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u32 id, first = cb->args[2];
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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] < map->elements; cb->args[2]++) {
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id = cb->args[2];
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if (!test_bit(id, map->members))
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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 * map->hosts)))
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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_ip_ttest(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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const struct bitmap_ip *map = set->data;
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const unsigned long *members = map->members;
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u16 id = *(u16 *)value;
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return ip_set_timeout_test(members[id]);
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}
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static int
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bitmap_ip_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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struct bitmap_ip *map = set->data;
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unsigned long *members = map->members;
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u16 id = *(u16 *)value;
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if (ip_set_timeout_test(members[id]) && !(flags & IPSET_FLAG_EXIST))
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return -IPSET_ERR_EXIST;
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members[id] = ip_set_timeout_set(timeout);
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return 0;
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}
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static int
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bitmap_ip_tdel(struct ip_set *set, void *value, u32 timeout, u32 flags)
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{
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struct bitmap_ip *map = set->data;
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unsigned long *members = map->members;
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u16 id = *(u16 *)value;
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int ret = -IPSET_ERR_EXIST;
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if (ip_set_timeout_test(members[id]))
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ret = 0;
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members[id] = IPSET_ELEM_UNSET;
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return ret;
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}
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static int
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bitmap_ip_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_ip *map = set->data;
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struct nlattr *adt, *nested;
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u32 id, first = cb->args[2];
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const unsigned long *members = map->members;
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adt = ipset_nest_start(skb, IPSET_ATTR_ADT);
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if (!adt)
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return -EMSGSIZE;
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for (; cb->args[2] < map->elements; cb->args[2]++) {
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id = cb->args[2];
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if (!ip_set_timeout_test(members[id]))
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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, adt);
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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 * map->hosts)) ||
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nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
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htonl(ip_set_timeout_get(members[id]))))
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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, adt);
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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, adt);
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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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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, const 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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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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ip = ip_to_id(map, ip);
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return adtfn(set, &ip, opt_timeout(opt, map), 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 timeout = map->timeout;
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u32 ip, ip_to, id;
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int ret = 0;
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if (unlikely(!tb[IPSET_ATTR_IP] ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
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return -IPSET_ERR_PROTOCOL;
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if (tb[IPSET_ATTR_LINENO])
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*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
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if (ret)
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return ret;
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if (ip < map->first_ip || ip > map->last_ip)
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return -IPSET_ERR_BITMAP_RANGE;
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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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if (adt == IPSET_TEST) {
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id = ip_to_id(map, ip);
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return adtfn(set, &id, timeout, flags);
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}
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if (tb[IPSET_ATTR_IP_TO]) {
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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
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if (ret)
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return ret;
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if (ip > ip_to) {
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swap(ip, ip_to);
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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 > 32)
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return -IPSET_ERR_INVALID_CIDR;
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ip_set_mask_from_to(ip, ip_to, cidr);
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} else
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ip_to = ip;
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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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id = ip_to_id(map, ip);
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ret = adtfn(set, &id, timeout, flags);
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if (ret && !ip_set_eexist(ret, flags))
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return ret;
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else
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ret = 0;
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}
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return ret;
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}
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static void
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bitmap_ip_destroy(struct ip_set *set)
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{
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struct bitmap_ip *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_ip_flush(struct ip_set *set)
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{
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struct bitmap_ip *map = set->data;
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memset(map->members, 0, map->memsize);
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}
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static int
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bitmap_ip_head(struct ip_set *set, struct sk_buff *skb)
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{
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const struct bitmap_ip *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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(map->netmask != 32 &&
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nla_put_u8(skb, IPSET_ATTR_NETMASK, map->netmask)) ||
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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) + map->memsize)) ||
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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_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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x->timeout == y->timeout;
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}
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static const struct ip_set_type_variant bitmap_ip = {
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.kadt = bitmap_ip_kadt,
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.uadt = bitmap_ip_uadt,
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.adt = {
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[IPSET_ADD] = bitmap_ip_add,
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[IPSET_DEL] = bitmap_ip_del,
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[IPSET_TEST] = bitmap_ip_test,
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},
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.destroy = bitmap_ip_destroy,
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.flush = bitmap_ip_flush,
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.head = bitmap_ip_head,
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.list = bitmap_ip_list,
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.same_set = bitmap_ip_same_set,
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};
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static const struct ip_set_type_variant bitmap_tip = {
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.kadt = bitmap_ip_kadt,
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.uadt = bitmap_ip_uadt,
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.adt = {
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[IPSET_ADD] = bitmap_ip_tadd,
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[IPSET_DEL] = bitmap_ip_tdel,
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[IPSET_TEST] = bitmap_ip_ttest,
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},
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.destroy = bitmap_ip_destroy,
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.flush = bitmap_ip_flush,
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.head = bitmap_ip_head,
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.list = bitmap_ip_tlist,
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.same_set = bitmap_ip_same_set,
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};
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static void
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bitmap_ip_gc(unsigned long ul_set)
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{
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struct ip_set *set = (struct ip_set *) ul_set;
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struct bitmap_ip *map = set->data;
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unsigned long *table = map->members;
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u32 id;
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/* We run parallel with other readers (test element)
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* but adding/deleting new entries is locked out */
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read_lock_bh(&set->lock);
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for (id = 0; id < map->elements; id++)
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if (ip_set_timeout_expired(table[id]))
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table[id] = IPSET_ELEM_UNSET;
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read_unlock_bh(&set->lock);
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map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
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add_timer(&map->gc);
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}
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static void
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bitmap_ip_gc_init(struct ip_set *set)
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{
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struct bitmap_ip *map = set->data;
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init_timer(&map->gc);
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map->gc.data = (unsigned long) set;
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map->gc.function = bitmap_ip_gc;
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map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
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add_timer(&map->gc);
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}
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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 = ip_set_alloc(map->memsize);
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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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map->timeout = IPSET_NO_TIMEOUT;
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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_ip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
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{
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struct bitmap_ip *map;
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u32 first_ip, last_ip, 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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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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u32 tmp = first_ip;
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first_ip = last_ip;
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last_ip = tmp;
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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 >= 32)
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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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if (tb[IPSET_ATTR_NETMASK]) {
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netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
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if (netmask > 32)
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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);
|
|
}
|
|
|
|
if (netmask == 32) {
|
|
hosts = 1;
|
|
elements = (u64)last_ip - first_ip + 1;
|
|
} else {
|
|
u8 mask_bits;
|
|
u32 mask;
|
|
|
|
mask = range_to_mask(first_ip, last_ip, &mask_bits);
|
|
|
|
if ((!mask && (first_ip || last_ip != 0xFFFFFFFF)) ||
|
|
netmask <= mask_bits)
|
|
return -IPSET_ERR_BITMAP_RANGE;
|
|
|
|
pr_debug("mask_bits %u, netmask %u\n", mask_bits, netmask);
|
|
hosts = 2 << (32 - netmask - 1);
|
|
elements = 2 << (netmask - mask_bits - 1);
|
|
}
|
|
if (elements > IPSET_BITMAP_MAX_RANGE + 1)
|
|
return -IPSET_ERR_BITMAP_RANGE_SIZE;
|
|
|
|
pr_debug("hosts %u, elements %llu\n",
|
|
hosts, (unsigned long long)elements);
|
|
|
|
map = kzalloc(sizeof(*map), GFP_KERNEL);
|
|
if (!map)
|
|
return -ENOMEM;
|
|
|
|
if (tb[IPSET_ATTR_TIMEOUT]) {
|
|
map->memsize = elements * sizeof(unsigned long);
|
|
|
|
if (!init_map_ip(set, map, first_ip, last_ip,
|
|
elements, hosts, netmask)) {
|
|
kfree(map);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
map->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
|
|
set->variant = &bitmap_tip;
|
|
|
|
bitmap_ip_gc_init(set);
|
|
} else {
|
|
map->memsize = bitmap_bytes(0, elements - 1);
|
|
|
|
if (!init_map_ip(set, map, first_ip, last_ip,
|
|
elements, hosts, netmask)) {
|
|
kfree(map);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
set->variant = &bitmap_ip;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct ip_set_type bitmap_ip_type __read_mostly = {
|
|
.name = "bitmap:ip",
|
|
.protocol = IPSET_PROTOCOL,
|
|
.features = IPSET_TYPE_IP,
|
|
.dimension = IPSET_DIM_ONE,
|
|
.family = NFPROTO_IPV4,
|
|
.revision_min = REVISION_MIN,
|
|
.revision_max = REVISION_MAX,
|
|
.create = bitmap_ip_create,
|
|
.create_policy = {
|
|
[IPSET_ATTR_IP] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_CIDR] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
},
|
|
.adt_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 },
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
},
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init
|
|
bitmap_ip_init(void)
|
|
{
|
|
return ip_set_type_register(&bitmap_ip_type);
|
|
}
|
|
|
|
static void __exit
|
|
bitmap_ip_fini(void)
|
|
{
|
|
ip_set_type_unregister(&bitmap_ip_type);
|
|
}
|
|
|
|
module_init(bitmap_ip_init);
|
|
module_exit(bitmap_ip_fini);
|