1 /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
2 * Patrick Schaaf <bof@bof.de>
3 * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 /* Kernel module implementing an IP set type: the bitmap:ip type */
12 #include <linux/module.h>
14 #include <linux/skbuff.h>
15 #include <linux/errno.h>
16 #include <linux/bitops.h>
17 #include <linux/spinlock.h>
18 #include <linux/netlink.h>
19 #include <linux/jiffies.h>
20 #include <linux/timer.h>
21 #include <net/netlink.h>
24 #include <linux/netfilter/ipset/pfxlen.h>
25 #include <linux/netfilter/ipset/ip_set.h>
26 #include <linux/netfilter/ipset/ip_set_bitmap.h>
28 #define IPSET_TYPE_REV_MIN 0
29 /* 1 Counter support added */
30 #define IPSET_TYPE_REV_MAX 2 /* Comment support added */
32 MODULE_LICENSE("GPL");
33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
34 IP_SET_MODULE_DESC("bitmap:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
35 MODULE_ALIAS("ip_set_bitmap:ip");
37 #define MTYPE bitmap_ip
41 void *members; /* the set members */
42 void *extensions; /* data extensions */
43 u32 first_ip; /* host byte order, included in range */
44 u32 last_ip; /* host byte order, included in range */
45 u32 elements; /* number of max elements in the set */
46 u32 hosts; /* number of hosts in a subnet */
47 size_t memsize; /* members size */
48 u8 netmask; /* subnet netmask */
49 struct timer_list gc; /* garbage collection */
52 /* ADT structure for generic function args */
53 struct bitmap_ip_adt_elem {
58 ip_to_id(const struct bitmap_ip *m, u32 ip)
60 return ((ip & ip_set_hostmask(m->netmask)) - m->first_ip)/m->hosts;
63 /* Common functions */
66 bitmap_ip_do_test(const struct bitmap_ip_adt_elem *e,
67 struct bitmap_ip *map, size_t dsize)
69 return !!test_bit(e->id, map->members);
73 bitmap_ip_gc_test(u16 id, const struct bitmap_ip *map, size_t dsize)
75 return !!test_bit(id, map->members);
79 bitmap_ip_do_add(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map,
80 u32 flags, size_t dsize)
82 return !!test_and_set_bit(e->id, map->members);
86 bitmap_ip_do_del(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map)
88 return !test_and_clear_bit(e->id, map->members);
92 bitmap_ip_do_list(struct sk_buff *skb, const struct bitmap_ip *map, u32 id,
95 return nla_put_ipaddr4(skb, IPSET_ATTR_IP,
96 htonl(map->first_ip + id * map->hosts));
100 bitmap_ip_do_head(struct sk_buff *skb, const struct bitmap_ip *map)
102 return nla_put_ipaddr4(skb, IPSET_ATTR_IP, htonl(map->first_ip)) ||
103 nla_put_ipaddr4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip)) ||
104 (map->netmask != 32 &&
105 nla_put_u8(skb, IPSET_ATTR_NETMASK, map->netmask));
109 bitmap_ip_kadt(struct ip_set *set, const struct sk_buff *skb,
110 const struct xt_action_param *par,
111 enum ipset_adt adt, struct ip_set_adt_opt *opt)
113 struct bitmap_ip *map = set->data;
114 ipset_adtfn adtfn = set->variant->adt[adt];
115 struct bitmap_ip_adt_elem e = { };
116 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
119 ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC));
120 if (ip < map->first_ip || ip > map->last_ip)
121 return -IPSET_ERR_BITMAP_RANGE;
123 e.id = ip_to_id(map, ip);
125 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
129 bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[],
130 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
132 struct bitmap_ip *map = set->data;
133 ipset_adtfn adtfn = set->variant->adt[adt];
134 u32 ip = 0, ip_to = 0;
135 struct bitmap_ip_adt_elem e = { };
136 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
139 if (unlikely(!tb[IPSET_ATTR_IP] ||
140 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
141 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
142 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
143 return -IPSET_ERR_PROTOCOL;
145 if (tb[IPSET_ATTR_LINENO])
146 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
148 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
149 ip_set_get_extensions(set, tb, &ext);
153 if (ip < map->first_ip || ip > map->last_ip)
154 return -IPSET_ERR_BITMAP_RANGE;
156 if (adt == IPSET_TEST) {
157 e.id = ip_to_id(map, ip);
158 return adtfn(set, &e, &ext, &ext, flags);
161 if (tb[IPSET_ATTR_IP_TO]) {
162 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
167 if (ip < map->first_ip)
168 return -IPSET_ERR_BITMAP_RANGE;
170 } else if (tb[IPSET_ATTR_CIDR]) {
171 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
173 if (!cidr || cidr > 32)
174 return -IPSET_ERR_INVALID_CIDR;
175 ip_set_mask_from_to(ip, ip_to, cidr);
179 if (ip_to > map->last_ip)
180 return -IPSET_ERR_BITMAP_RANGE;
182 for (; !before(ip_to, ip); ip += map->hosts) {
183 e.id = ip_to_id(map, ip);
184 ret = adtfn(set, &e, &ext, &ext, flags);
186 if (ret && !ip_set_eexist(ret, flags))
195 bitmap_ip_same_set(const struct ip_set *a, const struct ip_set *b)
197 const struct bitmap_ip *x = a->data;
198 const struct bitmap_ip *y = b->data;
200 return x->first_ip == y->first_ip &&
201 x->last_ip == y->last_ip &&
202 x->netmask == y->netmask &&
203 a->timeout == b->timeout &&
204 a->extensions == b->extensions;
209 struct bitmap_ip_elem {
212 #include "ip_set_bitmap_gen.h"
214 /* Create bitmap:ip type of sets */
217 init_map_ip(struct ip_set *set, struct bitmap_ip *map,
218 u32 first_ip, u32 last_ip,
219 u32 elements, u32 hosts, u8 netmask)
221 map->members = ip_set_alloc(map->memsize);
225 map->extensions = ip_set_alloc(set->dsize * elements);
226 if (!map->extensions) {
231 map->first_ip = first_ip;
232 map->last_ip = last_ip;
233 map->elements = elements;
235 map->netmask = netmask;
236 set->timeout = IPSET_NO_TIMEOUT;
239 set->family = NFPROTO_IPV4;
245 bitmap_ip_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
248 struct bitmap_ip *map;
249 u32 first_ip = 0, last_ip = 0, hosts;
254 if (unlikely(!tb[IPSET_ATTR_IP] ||
255 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
256 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
257 return -IPSET_ERR_PROTOCOL;
259 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip);
263 if (tb[IPSET_ATTR_IP_TO]) {
264 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip);
267 if (first_ip > last_ip) {
273 } else if (tb[IPSET_ATTR_CIDR]) {
274 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
277 return -IPSET_ERR_INVALID_CIDR;
278 ip_set_mask_from_to(first_ip, last_ip, cidr);
280 return -IPSET_ERR_PROTOCOL;
282 if (tb[IPSET_ATTR_NETMASK]) {
283 netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
286 return -IPSET_ERR_INVALID_NETMASK;
288 first_ip &= ip_set_hostmask(netmask);
289 last_ip |= ~ip_set_hostmask(netmask);
294 elements = (u64)last_ip - first_ip + 1;
299 mask = range_to_mask(first_ip, last_ip, &mask_bits);
301 if ((!mask && (first_ip || last_ip != 0xFFFFFFFF)) ||
302 netmask <= mask_bits)
303 return -IPSET_ERR_BITMAP_RANGE;
305 pr_debug("mask_bits %u, netmask %u\n", mask_bits, netmask);
306 hosts = 2 << (32 - netmask - 1);
307 elements = 2 << (netmask - mask_bits - 1);
309 if (elements > IPSET_BITMAP_MAX_RANGE + 1)
310 return -IPSET_ERR_BITMAP_RANGE_SIZE;
312 pr_debug("hosts %u, elements %llu\n",
313 hosts, (unsigned long long)elements);
315 map = kzalloc(sizeof(*map), GFP_KERNEL);
319 map->memsize = bitmap_bytes(0, elements - 1);
320 set->variant = &bitmap_ip;
321 set->dsize = ip_set_elem_len(set, tb, 0);
322 if (!init_map_ip(set, map, first_ip, last_ip,
323 elements, hosts, netmask)) {
327 if (tb[IPSET_ATTR_TIMEOUT]) {
328 set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
329 bitmap_ip_gc_init(set, bitmap_ip_gc);
334 static struct ip_set_type bitmap_ip_type __read_mostly = {
336 .protocol = IPSET_PROTOCOL,
337 .features = IPSET_TYPE_IP,
338 .dimension = IPSET_DIM_ONE,
339 .family = NFPROTO_IPV4,
340 .revision_min = IPSET_TYPE_REV_MIN,
341 .revision_max = IPSET_TYPE_REV_MAX,
342 .create = bitmap_ip_create,
344 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
345 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
346 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
347 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
348 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
349 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
352 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
353 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
354 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
355 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
356 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
357 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
358 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
359 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
367 return ip_set_type_register(&bitmap_ip_type);
373 ip_set_type_unregister(&bitmap_ip_type);
376 module_init(bitmap_ip_init);
377 module_exit(bitmap_ip_fini);