2011-02-01 15:37:04 +01:00
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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:port 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/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/ip_set.h>
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#include <linux/netfilter/ipset/ip_set_bitmap.h>
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#include <linux/netfilter/ipset/ip_set_getport.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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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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MODULE_DESCRIPTION("bitmap:port type of IP sets");
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MODULE_ALIAS("ip_set_bitmap:port");
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/* Type structure */
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struct bitmap_port {
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void *members; /* the set members */
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u16 first_port; /* host byte order, included in range */
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u16 last_port; /* host byte order, included in range */
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size_t memsize; /* members size */
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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 int
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2011-06-16 18:40:55 +02:00
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bitmap_port_test(struct ip_set *set, void *value, u32 timeout, u32 flags)
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2011-02-01 15:37:04 +01:00
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{
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const struct bitmap_port *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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2011-06-16 18:40:55 +02:00
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bitmap_port_add(struct ip_set *set, void *value, u32 timeout, u32 flags)
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2011-02-01 15:37:04 +01:00
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{
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struct bitmap_port *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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2011-06-16 18:40:55 +02:00
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bitmap_port_del(struct ip_set *set, void *value, u32 timeout, u32 flags)
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2011-02-01 15:37:04 +01:00
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{
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struct bitmap_port *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_port_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_port *map = set->data;
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struct nlattr *atd, *nested;
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u16 id, first = cb->args[2];
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u16 last = map->last_port - map->first_port;
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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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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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NLA_PUT_NET16(skb, IPSET_ATTR_PORT,
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htons(map->first_port + id));
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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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2011-06-16 18:40:55 +02:00
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bitmap_port_ttest(struct ip_set *set, void *value, u32 timeout, u32 flags)
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2011-02-01 15:37:04 +01:00
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{
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const struct bitmap_port *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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2011-06-16 18:40:55 +02:00
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bitmap_port_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
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2011-02-01 15:37:04 +01:00
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{
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struct bitmap_port *map = set->data;
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unsigned long *members = map->members;
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u16 id = *(u16 *)value;
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2011-06-16 18:40:55 +02:00
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if (ip_set_timeout_test(members[id]) && !(flags & IPSET_FLAG_EXIST))
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2011-02-01 15:37:04 +01:00
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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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2011-06-16 18:40:55 +02:00
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bitmap_port_tdel(struct ip_set *set, void *value, u32 timeout, u32 flags)
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2011-02-01 15:37:04 +01:00
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{
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struct bitmap_port *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_port_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_port *map = set->data;
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struct nlattr *adt, *nested;
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u16 id, first = cb->args[2];
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u16 last = map->last_port - map->first_port;
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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] <= last; 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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NLA_PUT_NET16(skb, IPSET_ATTR_PORT,
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htons(map->first_port + id));
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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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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_port_kadt(struct ip_set *set, const struct sk_buff *skb,
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2011-06-16 18:56:47 +02:00
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const struct xt_action_param *par,
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2011-06-16 18:42:40 +02:00
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enum ipset_adt adt, const struct ip_set_adt_opt *opt)
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2011-02-01 15:37:04 +01:00
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{
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struct bitmap_port *map = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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__be16 __port;
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u16 port = 0;
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2011-06-16 18:42:40 +02:00
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if (!ip_set_get_ip_port(skb, opt->family,
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opt->flags & IPSET_DIM_ONE_SRC, &__port))
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2011-02-01 15:37:04 +01:00
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return -EINVAL;
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port = ntohs(__port);
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if (port < map->first_port || port > map->last_port)
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return -IPSET_ERR_BITMAP_RANGE;
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port -= map->first_port;
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2011-06-16 18:42:40 +02:00
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return adtfn(set, &port, opt_timeout(opt, map), opt->cmdflags);
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2011-02-01 15:37:04 +01:00
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}
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static int
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bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
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2011-06-16 18:49:17 +02:00
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enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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2011-02-01 15:37:04 +01:00
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{
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struct bitmap_port *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 port; /* wraparound */
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u16 id, port_to;
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int ret = 0;
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if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
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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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port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
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if (port < map->first_port || port > map->last_port)
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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 = port - map->first_port;
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2011-06-16 18:40:55 +02:00
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return adtfn(set, &id, timeout, flags);
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2011-02-01 15:37:04 +01:00
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}
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if (tb[IPSET_ATTR_PORT_TO]) {
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port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
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if (port > port_to) {
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swap(port, port_to);
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if (port < map->first_port)
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return -IPSET_ERR_BITMAP_RANGE;
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}
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} else
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port_to = port;
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if (port_to > map->last_port)
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return -IPSET_ERR_BITMAP_RANGE;
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for (; port <= port_to; port++) {
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id = port - map->first_port;
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2011-06-16 18:40:55 +02:00
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ret = adtfn(set, &id, timeout, flags);
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2011-02-01 15:37:04 +01:00
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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_port_destroy(struct ip_set *set)
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{
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struct bitmap_port *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_port_flush(struct ip_set *set)
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{
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struct bitmap_port *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_port_head(struct ip_set *set, struct sk_buff *skb)
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{
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const struct bitmap_port *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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NLA_PUT_NET16(skb, IPSET_ATTR_PORT, htons(map->first_port));
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NLA_PUT_NET16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
|
2011-04-04 15:19:25 +02:00
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NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1));
|
2011-02-01 15:37:04 +01:00
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NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE,
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htonl(sizeof(*map) + map->memsize));
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if (with_timeout(map->timeout))
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NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(map->timeout));
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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_port_same_set(const struct ip_set *a, const struct ip_set *b)
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{
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const struct bitmap_port *x = a->data;
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const struct bitmap_port *y = b->data;
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return x->first_port == y->first_port &&
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x->last_port == y->last_port &&
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x->timeout == y->timeout;
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}
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static const struct ip_set_type_variant bitmap_port = {
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.kadt = bitmap_port_kadt,
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.uadt = bitmap_port_uadt,
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|
|
|
.adt = {
|
|
|
|
[IPSET_ADD] = bitmap_port_add,
|
|
|
|
[IPSET_DEL] = bitmap_port_del,
|
|
|
|
[IPSET_TEST] = bitmap_port_test,
|
|
|
|
},
|
|
|
|
.destroy = bitmap_port_destroy,
|
|
|
|
.flush = bitmap_port_flush,
|
|
|
|
.head = bitmap_port_head,
|
|
|
|
.list = bitmap_port_list,
|
|
|
|
.same_set = bitmap_port_same_set,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct ip_set_type_variant bitmap_tport = {
|
|
|
|
.kadt = bitmap_port_kadt,
|
|
|
|
.uadt = bitmap_port_uadt,
|
|
|
|
.adt = {
|
|
|
|
[IPSET_ADD] = bitmap_port_tadd,
|
|
|
|
[IPSET_DEL] = bitmap_port_tdel,
|
|
|
|
[IPSET_TEST] = bitmap_port_ttest,
|
|
|
|
},
|
|
|
|
.destroy = bitmap_port_destroy,
|
|
|
|
.flush = bitmap_port_flush,
|
|
|
|
.head = bitmap_port_head,
|
|
|
|
.list = bitmap_port_tlist,
|
|
|
|
.same_set = bitmap_port_same_set,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void
|
|
|
|
bitmap_port_gc(unsigned long ul_set)
|
|
|
|
{
|
|
|
|
struct ip_set *set = (struct ip_set *) ul_set;
|
|
|
|
struct bitmap_port *map = set->data;
|
|
|
|
unsigned long *table = map->members;
|
|
|
|
u32 id; /* wraparound */
|
|
|
|
u16 last = map->last_port - map->first_port;
|
|
|
|
|
|
|
|
/* 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++)
|
|
|
|
if (ip_set_timeout_expired(table[id]))
|
|
|
|
table[id] = IPSET_ELEM_UNSET;
|
|
|
|
read_unlock_bh(&set->lock);
|
|
|
|
|
|
|
|
map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
|
|
|
|
add_timer(&map->gc);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
bitmap_port_gc_init(struct ip_set *set)
|
|
|
|
{
|
|
|
|
struct bitmap_port *map = set->data;
|
|
|
|
|
|
|
|
init_timer(&map->gc);
|
|
|
|
map->gc.data = (unsigned long) set;
|
|
|
|
map->gc.function = bitmap_port_gc;
|
|
|
|
map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
|
|
|
|
add_timer(&map->gc);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Create bitmap:ip type of sets */
|
|
|
|
|
|
|
|
static bool
|
|
|
|
init_map_port(struct ip_set *set, struct bitmap_port *map,
|
|
|
|
u16 first_port, u16 last_port)
|
|
|
|
{
|
|
|
|
map->members = ip_set_alloc(map->memsize);
|
|
|
|
if (!map->members)
|
|
|
|
return false;
|
|
|
|
map->first_port = first_port;
|
|
|
|
map->last_port = last_port;
|
|
|
|
map->timeout = IPSET_NO_TIMEOUT;
|
|
|
|
|
|
|
|
set->data = map;
|
|
|
|
set->family = AF_UNSPEC;
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
bitmap_port_create(struct ip_set *set, struct nlattr *tb[],
|
|
|
|
u32 flags)
|
|
|
|
{
|
|
|
|
struct bitmap_port *map;
|
|
|
|
u16 first_port, last_port;
|
|
|
|
|
|
|
|
if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
|
|
|
|
!ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
|
|
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
|
|
|
|
return -IPSET_ERR_PROTOCOL;
|
|
|
|
|
|
|
|
first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
|
|
|
|
last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
|
|
|
|
if (first_port > last_port) {
|
|
|
|
u16 tmp = first_port;
|
|
|
|
|
|
|
|
first_port = last_port;
|
|
|
|
last_port = tmp;
|
|
|
|
}
|
|
|
|
|
|
|
|
map = kzalloc(sizeof(*map), GFP_KERNEL);
|
|
|
|
if (!map)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
if (tb[IPSET_ATTR_TIMEOUT]) {
|
|
|
|
map->memsize = (last_port - first_port + 1)
|
|
|
|
* sizeof(unsigned long);
|
|
|
|
|
|
|
|
if (!init_map_port(set, map, first_port, last_port)) {
|
|
|
|
kfree(map);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
map->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
|
|
|
|
set->variant = &bitmap_tport;
|
|
|
|
|
|
|
|
bitmap_port_gc_init(set);
|
|
|
|
} else {
|
|
|
|
map->memsize = bitmap_bytes(0, last_port - first_port);
|
|
|
|
pr_debug("memsize: %zu\n", map->memsize);
|
|
|
|
if (!init_map_port(set, map, first_port, last_port)) {
|
|
|
|
kfree(map);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
set->variant = &bitmap_port;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct ip_set_type bitmap_port_type = {
|
|
|
|
.name = "bitmap:port",
|
|
|
|
.protocol = IPSET_PROTOCOL,
|
|
|
|
.features = IPSET_TYPE_PORT,
|
|
|
|
.dimension = IPSET_DIM_ONE,
|
|
|
|
.family = AF_UNSPEC,
|
2011-06-16 18:51:41 +02:00
|
|
|
.revision_min = 0,
|
|
|
|
.revision_max = 0,
|
2011-02-01 15:37:04 +01:00
|
|
|
.create = bitmap_port_create,
|
|
|
|
.create_policy = {
|
|
|
|
[IPSET_ATTR_PORT] = { .type = NLA_U16 },
|
|
|
|
[IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
|
|
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
|
|
},
|
|
|
|
.adt_policy = {
|
|
|
|
[IPSET_ATTR_PORT] = { .type = NLA_U16 },
|
|
|
|
[IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
|
|
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
|
|
},
|
|
|
|
.me = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
bitmap_port_init(void)
|
|
|
|
{
|
|
|
|
return ip_set_type_register(&bitmap_port_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit
|
|
|
|
bitmap_port_fini(void)
|
|
|
|
{
|
|
|
|
ip_set_type_unregister(&bitmap_port_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(bitmap_port_init);
|
|
|
|
module_exit(bitmap_port_fini);
|