--- /dev/null
+/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
+ * Patrick Schaaf <bof@bof.de>
+ * Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Kernel module implementing an IP set type: the bitmap:ip type */
+
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/uaccess.h>
+#include <linux/bitops.h>
+#include <linux/spinlock.h>
+#include <linux/netlink.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
+#include <net/netlink.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter/ipset/pfxlen.h>
+#include <linux/netfilter/ipset/ip_set.h>
+#include <linux/netfilter/ipset/ip_set_bitmap.h>
+#define IP_SET_BITMAP_TIMEOUT
+#include <linux/netfilter/ipset/ip_set_timeout.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
+MODULE_DESCRIPTION("bitmap:ip type of IP sets");
+MODULE_ALIAS("ip_set_bitmap:ip");
+
+/* Type structure */
+struct bitmap_ip {
+ void *members; /* the set members */
+ u32 first_ip; /* host byte order, included in range */
+ u32 last_ip; /* host byte order, included in range */
+ u32 elements; /* number of max elements in the set */
+ u32 hosts; /* number of hosts in a subnet */
+ size_t memsize; /* members size */
+ u8 netmask; /* subnet netmask */
+ u32 timeout; /* timeout parameter */
+ struct timer_list gc; /* garbage collection */
+};
+
+/* Base variant */
+
+static inline u32
+ip_to_id(const struct bitmap_ip *m, u32 ip)
+{
+ return ((ip & ip_set_hostmask(m->netmask)) - m->first_ip)/m->hosts;
+}
+
+static int
+bitmap_ip_test(struct ip_set *set, void *value, u32 timeout)
+{
+ const struct bitmap_ip *map = set->data;
+ u16 id = *(u16 *)value;
+
+ return !!test_bit(id, map->members);
+}
+
+static int
+bitmap_ip_add(struct ip_set *set, void *value, u32 timeout)
+{
+ struct bitmap_ip *map = set->data;
+ u16 id = *(u16 *)value;
+
+ if (test_and_set_bit(id, map->members))
+ return -IPSET_ERR_EXIST;
+
+ return 0;
+}
+
+static int
+bitmap_ip_del(struct ip_set *set, void *value, u32 timeout)
+{
+ struct bitmap_ip *map = set->data;
+ u16 id = *(u16 *)value;
+
+ if (!test_and_clear_bit(id, map->members))
+ return -IPSET_ERR_EXIST;
+
+ return 0;
+}
+
+static int
+bitmap_ip_list(const struct ip_set *set,
+ struct sk_buff *skb, struct netlink_callback *cb)
+{
+ const struct bitmap_ip *map = set->data;
+ struct nlattr *atd, *nested;
+ u32 id, first = cb->args[2];
+
+ atd = ipset_nest_start(skb, IPSET_ATTR_ADT);
+ if (!atd)
+ return -EMSGSIZE;
+ for (; cb->args[2] < map->elements; cb->args[2]++) {
+ id = cb->args[2];
+ if (!test_bit(id, map->members))
+ continue;
+ nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
+ if (!nested) {
+ if (id == first) {
+ nla_nest_cancel(skb, atd);
+ return -EMSGSIZE;
+ } else
+ goto nla_put_failure;
+ }
+ NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP,
+ htonl(map->first_ip + id * map->hosts));
+ ipset_nest_end(skb, nested);
+ }
+ ipset_nest_end(skb, atd);
+ /* Set listing finished */
+ cb->args[2] = 0;
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nested);
+ ipset_nest_end(skb, atd);
+ if (unlikely(id == first)) {
+ cb->args[2] = 0;
+ return -EMSGSIZE;
+ }
+ return 0;
+}
+
+/* Timeout variant */
+
+static int
+bitmap_ip_ttest(struct ip_set *set, void *value, u32 timeout)
+{
+ const struct bitmap_ip *map = set->data;
+ const unsigned long *members = map->members;
+ u16 id = *(u16 *)value;
+
+ return ip_set_timeout_test(members[id]);
+}
+
+static int
+bitmap_ip_tadd(struct ip_set *set, void *value, u32 timeout)
+{
+ struct bitmap_ip *map = set->data;
+ unsigned long *members = map->members;
+ u16 id = *(u16 *)value;
+
+ if (ip_set_timeout_test(members[id]))
+ return -IPSET_ERR_EXIST;
+
+ members[id] = ip_set_timeout_set(timeout);
+
+ return 0;
+}
+
+static int
+bitmap_ip_tdel(struct ip_set *set, void *value, u32 timeout)
+{
+ struct bitmap_ip *map = set->data;
+ unsigned long *members = map->members;
+ u16 id = *(u16 *)value;
+ int ret = -IPSET_ERR_EXIST;
+
+ if (ip_set_timeout_test(members[id]))
+ ret = 0;
+
+ members[id] = IPSET_ELEM_UNSET;
+ return ret;
+}
+
+static int
+bitmap_ip_tlist(const struct ip_set *set,
+ struct sk_buff *skb, struct netlink_callback *cb)
+{
+ const struct bitmap_ip *map = set->data;
+ struct nlattr *adt, *nested;
+ u32 id, first = cb->args[2];
+ const unsigned long *members = map->members;
+
+ adt = ipset_nest_start(skb, IPSET_ATTR_ADT);
+ if (!adt)
+ return -EMSGSIZE;
+ for (; cb->args[2] < map->elements; cb->args[2]++) {
+ id = cb->args[2];
+ if (!ip_set_timeout_test(members[id]))
+ continue;
+ nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
+ if (!nested) {
+ if (id == first) {
+ nla_nest_cancel(skb, adt);
+ return -EMSGSIZE;
+ } else
+ goto nla_put_failure;
+ }
+ NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP,
+ htonl(map->first_ip + id * map->hosts));
+ NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,
+ htonl(ip_set_timeout_get(members[id])));
+ ipset_nest_end(skb, nested);
+ }
+ ipset_nest_end(skb, adt);
+
+ /* Set listing finished */
+ cb->args[2] = 0;
+
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nested);
+ ipset_nest_end(skb, adt);
+ if (unlikely(id == first)) {
+ cb->args[2] = 0;
+ return -EMSGSIZE;
+ }
+ return 0;
+}
+
+static int
+bitmap_ip_kadt(struct ip_set *set, const struct sk_buff *skb,
+ enum ipset_adt adt, u8 pf, u8 dim, u8 flags)
+{
+ struct bitmap_ip *map = set->data;
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ u32 ip;
+
+ ip = ntohl(ip4addr(skb, flags & IPSET_DIM_ONE_SRC));
+ if (ip < map->first_ip || ip > map->last_ip)
+ return -IPSET_ERR_BITMAP_RANGE;
+
+ ip = ip_to_id(map, ip);
+
+ return adtfn(set, &ip, map->timeout);
+}
+
+static int
+bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[],
+ enum ipset_adt adt, u32 *lineno, u32 flags)
+{
+ struct bitmap_ip *map = set->data;
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ u32 timeout = map->timeout;
+ u32 ip, ip_to, id;
+ int ret = 0;
+
+ if (unlikely(!tb[IPSET_ATTR_IP] ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
+ return -IPSET_ERR_PROTOCOL;
+
+ if (tb[IPSET_ATTR_LINENO])
+ *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
+
+ ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
+ if (ret)
+ return ret;
+
+ if (ip < map->first_ip || ip > map->last_ip)
+ return -IPSET_ERR_BITMAP_RANGE;
+
+ if (tb[IPSET_ATTR_TIMEOUT]) {
+ if (!with_timeout(map->timeout))
+ return -IPSET_ERR_TIMEOUT;
+ timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
+ }
+
+ if (adt == IPSET_TEST) {
+ id = ip_to_id(map, ip);
+ return adtfn(set, &id, timeout);
+ }
+
+ if (tb[IPSET_ATTR_IP_TO]) {
+ ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
+ if (ret)
+ return ret;
+ if (ip > ip_to) {
+ swap(ip, ip_to);
+ if (ip < map->first_ip)
+ return -IPSET_ERR_BITMAP_RANGE;
+ }
+ } else if (tb[IPSET_ATTR_CIDR]) {
+ u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
+
+ if (cidr > 32)
+ return -IPSET_ERR_INVALID_CIDR;
+ ip &= ip_set_hostmask(cidr);
+ ip_to = ip | ~ip_set_hostmask(cidr);
+ } else
+ ip_to = ip;
+
+ if (ip_to > map->last_ip)
+ return -IPSET_ERR_BITMAP_RANGE;
+
+ for (; !before(ip_to, ip); ip += map->hosts) {
+ id = ip_to_id(map, ip);
+ ret = adtfn(set, &id, timeout);;
+
+ if (ret && !ip_set_eexist(ret, flags))
+ return ret;
+ else
+ ret = 0;
+ }
+ return ret;
+}
+
+static void
+bitmap_ip_destroy(struct ip_set *set)
+{
+ struct bitmap_ip *map = set->data;
+
+ if (with_timeout(map->timeout))
+ del_timer_sync(&map->gc);
+
+ ip_set_free(map->members);
+ kfree(map);
+
+ set->data = NULL;
+}
+
+static void
+bitmap_ip_flush(struct ip_set *set)
+{
+ struct bitmap_ip *map = set->data;
+
+ memset(map->members, 0, map->memsize);
+}
+
+static int
+bitmap_ip_head(struct ip_set *set, struct sk_buff *skb)
+{
+ const struct bitmap_ip *map = set->data;
+ struct nlattr *nested;
+
+ nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
+ if (!nested)
+ goto nla_put_failure;
+ NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, htonl(map->first_ip));
+ NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip));
+ if (map->netmask != 32)
+ NLA_PUT_U8(skb, IPSET_ATTR_NETMASK, map->netmask);
+ NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES,
+ htonl(atomic_read(&set->ref) - 1));
+ NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE,
+ htonl(sizeof(*map) + map->memsize));
+ if (with_timeout(map->timeout))
+ NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(map->timeout));
+ ipset_nest_end(skb, nested);
+
+ return 0;
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static bool
+bitmap_ip_same_set(const struct ip_set *a, const struct ip_set *b)
+{
+ const struct bitmap_ip *x = a->data;
+ const struct bitmap_ip *y = b->data;
+
+ return x->first_ip == y->first_ip &&
+ x->last_ip == y->last_ip &&
+ x->netmask == y->netmask &&
+ x->timeout == y->timeout;
+}
+
+static const struct ip_set_type_variant bitmap_ip = {
+ .kadt = bitmap_ip_kadt,
+ .uadt = bitmap_ip_uadt,
+ .adt = {
+ [IPSET_ADD] = bitmap_ip_add,
+ [IPSET_DEL] = bitmap_ip_del,
+ [IPSET_TEST] = bitmap_ip_test,
+ },
+ .destroy = bitmap_ip_destroy,
+ .flush = bitmap_ip_flush,
+ .head = bitmap_ip_head,
+ .list = bitmap_ip_list,
+ .same_set = bitmap_ip_same_set,
+};
+
+static const struct ip_set_type_variant bitmap_tip = {
+ .kadt = bitmap_ip_kadt,
+ .uadt = bitmap_ip_uadt,
+ .adt = {
+ [IPSET_ADD] = bitmap_ip_tadd,
+ [IPSET_DEL] = bitmap_ip_tdel,
+ [IPSET_TEST] = bitmap_ip_ttest,
+ },
+ .destroy = bitmap_ip_destroy,
+ .flush = bitmap_ip_flush,
+ .head = bitmap_ip_head,
+ .list = bitmap_ip_tlist,
+ .same_set = bitmap_ip_same_set,
+};
+
+static void
+bitmap_ip_gc(unsigned long ul_set)
+{
+ struct ip_set *set = (struct ip_set *) ul_set;
+ struct bitmap_ip *map = set->data;
+ unsigned long *table = map->members;
+ u32 id;
+
+ /* 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 < map->elements; 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_ip_gc_init(struct ip_set *set)
+{
+ struct bitmap_ip *map = set->data;
+
+ init_timer(&map->gc);
+ map->gc.data = (unsigned long) set;
+ map->gc.function = bitmap_ip_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_ip(struct ip_set *set, struct bitmap_ip *map,
+ u32 first_ip, u32 last_ip,
+ u32 elements, u32 hosts, u8 netmask)
+{
+ map->members = ip_set_alloc(map->memsize);
+ if (!map->members)
+ return false;
+ map->first_ip = first_ip;
+ map->last_ip = last_ip;
+ map->elements = elements;
+ map->hosts = hosts;
+ map->netmask = netmask;
+ map->timeout = IPSET_NO_TIMEOUT;
+
+ set->data = map;
+ set->family = AF_INET;
+
+ return true;
+}
+
+static int
+bitmap_ip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
+{
+ struct bitmap_ip *map;
+ u32 first_ip, last_ip, hosts, elements;
+ u8 netmask = 32;
+ 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;
+ last_ip = first_ip | ~ip_set_hostmask(cidr);
+ } else
+ return -IPSET_ERR_PROTOCOL;
+
+ if (tb[IPSET_ATTR_NETMASK]) {
+ netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
+
+ if (netmask > 32)
+ return -IPSET_ERR_INVALID_NETMASK;
+
+ first_ip &= ip_set_hostmask(netmask);
+ last_ip |= ~ip_set_hostmask(netmask);
+ }
+
+ if (netmask == 32) {
+ hosts = 1;
+ elements = 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 %u\n", hosts, 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 = AF_INET,
+ .revision = 0,
+ .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);
projects / users / hch / xfs.git / commitdiff