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 /* 2 Comment support added */
31 #define IPSET_TYPE_REV_MAX 3 /* skbinfo support added */
33 MODULE_LICENSE("GPL");
34 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
35 IP_SET_MODULE_DESC("bitmap:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
36 MODULE_ALIAS("ip_set_bitmap:ip");
38 #define MTYPE bitmap_ip
43 void *members; /* the set members */
44 u32 first_ip; /* host byte order, included in range */
45 u32 last_ip; /* host byte order, included in range */
46 u32 elements; /* number of max elements in the set */
47 u32 hosts; /* number of hosts in a subnet */
48 size_t memsize; /* members size */
49 u8 netmask; /* subnet netmask */
50 struct timer_list gc; /* garbage collection */
51 unsigned char extensions[0] /* data extensions */
52 __aligned(__alignof__(u64));
55 /* ADT structure for generic function args */
56 struct bitmap_ip_adt_elem {
61 ip_to_id(const struct bitmap_ip *m, u32 ip)
63 return ((ip & ip_set_hostmask(m->netmask)) - m->first_ip) / m->hosts;
66 /* Common functions */
69 bitmap_ip_do_test(const struct bitmap_ip_adt_elem *e,
70 struct bitmap_ip *map, size_t dsize)
72 return !!test_bit(e->id, map->members);
76 bitmap_ip_gc_test(u16 id, const struct bitmap_ip *map, size_t dsize)
78 return !!test_bit(id, map->members);
82 bitmap_ip_do_add(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map,
83 u32 flags, size_t dsize)
85 return !!test_bit(e->id, map->members);
89 bitmap_ip_do_del(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map)
91 return !test_and_clear_bit(e->id, map->members);
95 bitmap_ip_do_list(struct sk_buff *skb, const struct bitmap_ip *map, u32 id,
98 return nla_put_ipaddr4(skb, IPSET_ATTR_IP,
99 htonl(map->first_ip + id * map->hosts));
103 bitmap_ip_do_head(struct sk_buff *skb, const struct bitmap_ip *map)
105 return nla_put_ipaddr4(skb, IPSET_ATTR_IP, htonl(map->first_ip)) ||
106 nla_put_ipaddr4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip)) ||
107 (map->netmask != 32 &&
108 nla_put_u8(skb, IPSET_ATTR_NETMASK, map->netmask));
112 bitmap_ip_kadt(struct ip_set *set, const struct sk_buff *skb,
113 const struct xt_action_param *par,
114 enum ipset_adt adt, struct ip_set_adt_opt *opt)
116 struct bitmap_ip *map = set->data;
117 ipset_adtfn adtfn = set->variant->adt[adt];
118 struct bitmap_ip_adt_elem e = { .id = 0 };
119 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
122 ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC));
123 if (ip < map->first_ip || ip > map->last_ip)
124 return -IPSET_ERR_BITMAP_RANGE;
126 e.id = ip_to_id(map, ip);
128 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
132 bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[],
133 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
135 struct bitmap_ip *map = set->data;
136 ipset_adtfn adtfn = set->variant->adt[adt];
137 u32 ip = 0, ip_to = 0;
138 struct bitmap_ip_adt_elem e = { .id = 0 };
139 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
142 if (tb[IPSET_ATTR_LINENO])
143 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
145 if (unlikely(!tb[IPSET_ATTR_IP]))
146 return -IPSET_ERR_PROTOCOL;
148 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
152 ret = ip_set_get_extensions(set, tb, &ext);
156 if (ip < map->first_ip || ip > map->last_ip)
157 return -IPSET_ERR_BITMAP_RANGE;
159 if (adt == IPSET_TEST) {
160 e.id = ip_to_id(map, ip);
161 return adtfn(set, &e, &ext, &ext, flags);
164 if (tb[IPSET_ATTR_IP_TO]) {
165 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
170 if (ip < map->first_ip)
171 return -IPSET_ERR_BITMAP_RANGE;
173 } else if (tb[IPSET_ATTR_CIDR]) {
174 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
176 if (!cidr || cidr > HOST_MASK)
177 return -IPSET_ERR_INVALID_CIDR;
178 ip_set_mask_from_to(ip, ip_to, cidr);
183 if (ip_to > map->last_ip)
184 return -IPSET_ERR_BITMAP_RANGE;
186 for (; !before(ip_to, ip); ip += map->hosts) {
187 e.id = ip_to_id(map, ip);
188 ret = adtfn(set, &e, &ext, &ext, flags);
190 if (ret && !ip_set_eexist(ret, flags))
199 bitmap_ip_same_set(const struct ip_set *a, const struct ip_set *b)
201 const struct bitmap_ip *x = a->data;
202 const struct bitmap_ip *y = b->data;
204 return x->first_ip == y->first_ip &&
205 x->last_ip == y->last_ip &&
206 x->netmask == y->netmask &&
207 a->timeout == b->timeout &&
208 a->extensions == b->extensions;
213 struct bitmap_ip_elem {
216 #include "ip_set_bitmap_gen.h"
218 /* Create bitmap:ip type of sets */
221 init_map_ip(struct ip_set *set, struct bitmap_ip *map,
222 u32 first_ip, u32 last_ip,
223 u32 elements, u32 hosts, u8 netmask)
225 map->members = ip_set_alloc(map->memsize);
228 map->first_ip = first_ip;
229 map->last_ip = last_ip;
230 map->elements = elements;
232 map->netmask = netmask;
233 set->timeout = IPSET_NO_TIMEOUT;
236 set->family = NFPROTO_IPV4;
242 bitmap_ip_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
245 struct bitmap_ip *map;
246 u32 first_ip = 0, last_ip = 0, hosts;
251 if (unlikely(!tb[IPSET_ATTR_IP] ||
252 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
253 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
254 return -IPSET_ERR_PROTOCOL;
256 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip);
260 if (tb[IPSET_ATTR_IP_TO]) {
261 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip);
264 if (first_ip > last_ip) {
270 } else if (tb[IPSET_ATTR_CIDR]) {
271 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
273 if (cidr >= HOST_MASK)
274 return -IPSET_ERR_INVALID_CIDR;
275 ip_set_mask_from_to(first_ip, last_ip, cidr);
277 return -IPSET_ERR_PROTOCOL;
280 if (tb[IPSET_ATTR_NETMASK]) {
281 netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
283 if (netmask > HOST_MASK)
284 return -IPSET_ERR_INVALID_NETMASK;
286 first_ip &= ip_set_hostmask(netmask);
287 last_ip |= ~ip_set_hostmask(netmask);
292 elements = (u64)last_ip - first_ip + 1;
297 mask = range_to_mask(first_ip, last_ip, &mask_bits);
299 if ((!mask && (first_ip || last_ip != 0xFFFFFFFF)) ||
300 netmask <= mask_bits)
301 return -IPSET_ERR_BITMAP_RANGE;
303 pr_debug("mask_bits %u, netmask %u\n", mask_bits, netmask);
304 hosts = 2 << (32 - netmask - 1);
305 elements = 2 << (netmask - mask_bits - 1);
307 if (elements > IPSET_BITMAP_MAX_RANGE + 1)
308 return -IPSET_ERR_BITMAP_RANGE_SIZE;
310 pr_debug("hosts %u, elements %llu\n",
311 hosts, (unsigned long long)elements);
313 set->dsize = ip_set_elem_len(set, tb, 0, 0);
314 map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
318 map->memsize = bitmap_bytes(0, elements - 1);
319 set->variant = &bitmap_ip;
320 if (!init_map_ip(set, map, first_ip, last_ip,
321 elements, hosts, netmask)) {
325 if (tb[IPSET_ATTR_TIMEOUT]) {
326 set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
327 bitmap_ip_gc_init(set, bitmap_ip_gc);
332 static struct ip_set_type bitmap_ip_type __read_mostly = {
334 .protocol = IPSET_PROTOCOL,
335 .features = IPSET_TYPE_IP,
336 .dimension = IPSET_DIM_ONE,
337 .family = NFPROTO_IPV4,
338 .revision_min = IPSET_TYPE_REV_MIN,
339 .revision_max = IPSET_TYPE_REV_MAX,
340 .create = bitmap_ip_create,
342 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
343 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
344 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
345 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
346 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
347 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
350 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
351 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
352 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
353 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
354 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
355 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
356 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
357 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
358 .len = IPSET_MAX_COMMENT_SIZE },
359 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
360 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
361 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
369 return ip_set_type_register(&bitmap_ip_type);
376 ip_set_type_unregister(&bitmap_ip_type);
379 module_init(bitmap_ip_init);
380 module_exit(bitmap_ip_fini);