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TOMOYO Linux Cross Reference
Linux/net/netfilter/ipset/ip_set_bitmap_ip.c

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  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>
  4  *
  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.
  8  */
  9 
 10 /* Kernel module implementing an IP set type: the bitmap:ip type */
 11 
 12 #include <linux/module.h>
 13 #include <linux/ip.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>
 22 #include <net/tcp.h>
 23 
 24 #include <linux/netfilter/ipset/pfxlen.h>
 25 #include <linux/netfilter/ipset/ip_set.h>
 26 #include <linux/netfilter/ipset/ip_set_bitmap.h>
 27 
 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 */
 32 
 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");
 37 
 38 #define MTYPE           bitmap_ip
 39 #define HOST_MASK       32
 40 
 41 /* Type structure */
 42 struct 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));
 53 };
 54 
 55 /* ADT structure for generic function args */
 56 struct bitmap_ip_adt_elem {
 57         u16 id;
 58 };
 59 
 60 static inline u32
 61 ip_to_id(const struct bitmap_ip *m, u32 ip)
 62 {
 63         return ((ip & ip_set_hostmask(m->netmask)) - m->first_ip) / m->hosts;
 64 }
 65 
 66 /* Common functions */
 67 
 68 static inline int
 69 bitmap_ip_do_test(const struct bitmap_ip_adt_elem *e,
 70                   struct bitmap_ip *map, size_t dsize)
 71 {
 72         return !!test_bit(e->id, map->members);
 73 }
 74 
 75 static inline int
 76 bitmap_ip_gc_test(u16 id, const struct bitmap_ip *map, size_t dsize)
 77 {
 78         return !!test_bit(id, map->members);
 79 }
 80 
 81 static inline int
 82 bitmap_ip_do_add(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map,
 83                  u32 flags, size_t dsize)
 84 {
 85         return !!test_bit(e->id, map->members);
 86 }
 87 
 88 static inline int
 89 bitmap_ip_do_del(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map)
 90 {
 91         return !test_and_clear_bit(e->id, map->members);
 92 }
 93 
 94 static inline int
 95 bitmap_ip_do_list(struct sk_buff *skb, const struct bitmap_ip *map, u32 id,
 96                   size_t dsize)
 97 {
 98         return nla_put_ipaddr4(skb, IPSET_ATTR_IP,
 99                         htonl(map->first_ip + id * map->hosts));
100 }
101 
102 static inline int
103 bitmap_ip_do_head(struct sk_buff *skb, const struct bitmap_ip *map)
104 {
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));
109 }
110 
111 static int
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)
115 {
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);
120         u32 ip;
121 
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;
125 
126         e.id = ip_to_id(map, ip);
127 
128         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
129 }
130 
131 static int
132 bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[],
133                enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
134 {
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);
140         int ret = 0;
141 
142         if (tb[IPSET_ATTR_LINENO])
143                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
144 
145         if (unlikely(!tb[IPSET_ATTR_IP]))
146                 return -IPSET_ERR_PROTOCOL;
147 
148         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
149         if (ret)
150                 return ret;
151 
152         ret = ip_set_get_extensions(set, tb, &ext);
153         if (ret)
154                 return ret;
155 
156         if (ip < map->first_ip || ip > map->last_ip)
157                 return -IPSET_ERR_BITMAP_RANGE;
158 
159         if (adt == IPSET_TEST) {
160                 e.id = ip_to_id(map, ip);
161                 return adtfn(set, &e, &ext, &ext, flags);
162         }
163 
164         if (tb[IPSET_ATTR_IP_TO]) {
165                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
166                 if (ret)
167                         return ret;
168                 if (ip > ip_to) {
169                         swap(ip, ip_to);
170                         if (ip < map->first_ip)
171                                 return -IPSET_ERR_BITMAP_RANGE;
172                 }
173         } else if (tb[IPSET_ATTR_CIDR]) {
174                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
175 
176                 if (!cidr || cidr > HOST_MASK)
177                         return -IPSET_ERR_INVALID_CIDR;
178                 ip_set_mask_from_to(ip, ip_to, cidr);
179         } else {
180                 ip_to = ip;
181         }
182 
183         if (ip_to > map->last_ip)
184                 return -IPSET_ERR_BITMAP_RANGE;
185 
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);
189 
190                 if (ret && !ip_set_eexist(ret, flags))
191                         return ret;
192 
193                 ret = 0;
194         }
195         return ret;
196 }
197 
198 static bool
199 bitmap_ip_same_set(const struct ip_set *a, const struct ip_set *b)
200 {
201         const struct bitmap_ip *x = a->data;
202         const struct bitmap_ip *y = b->data;
203 
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;
209 }
210 
211 /* Plain variant */
212 
213 struct bitmap_ip_elem {
214 };
215 
216 #include "ip_set_bitmap_gen.h"
217 
218 /* Create bitmap:ip type of sets */
219 
220 static bool
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)
224 {
225         map->members = ip_set_alloc(map->memsize);
226         if (!map->members)
227                 return false;
228         map->first_ip = first_ip;
229         map->last_ip = last_ip;
230         map->elements = elements;
231         map->hosts = hosts;
232         map->netmask = netmask;
233         set->timeout = IPSET_NO_TIMEOUT;
234 
235         set->data = map;
236         set->family = NFPROTO_IPV4;
237 
238         return true;
239 }
240 
241 static int
242 bitmap_ip_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
243                  u32 flags)
244 {
245         struct bitmap_ip *map;
246         u32 first_ip = 0, last_ip = 0, hosts;
247         u64 elements;
248         u8 netmask = 32;
249         int ret;
250 
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;
255 
256         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip);
257         if (ret)
258                 return ret;
259 
260         if (tb[IPSET_ATTR_IP_TO]) {
261                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip);
262                 if (ret)
263                         return ret;
264                 if (first_ip > last_ip) {
265                         u32 tmp = first_ip;
266 
267                         first_ip = last_ip;
268                         last_ip = tmp;
269                 }
270         } else if (tb[IPSET_ATTR_CIDR]) {
271                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
272 
273                 if (cidr >= HOST_MASK)
274                         return -IPSET_ERR_INVALID_CIDR;
275                 ip_set_mask_from_to(first_ip, last_ip, cidr);
276         } else {
277                 return -IPSET_ERR_PROTOCOL;
278         }
279 
280         if (tb[IPSET_ATTR_NETMASK]) {
281                 netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
282 
283                 if (netmask > HOST_MASK)
284                         return -IPSET_ERR_INVALID_NETMASK;
285 
286                 first_ip &= ip_set_hostmask(netmask);
287                 last_ip |= ~ip_set_hostmask(netmask);
288         }
289 
290         if (netmask == 32) {
291                 hosts = 1;
292                 elements = (u64)last_ip - first_ip + 1;
293         } else {
294                 u8 mask_bits;
295                 u32 mask;
296 
297                 mask = range_to_mask(first_ip, last_ip, &mask_bits);
298 
299                 if ((!mask && (first_ip || last_ip != 0xFFFFFFFF)) ||
300                     netmask <= mask_bits)
301                         return -IPSET_ERR_BITMAP_RANGE;
302 
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);
306         }
307         if (elements > IPSET_BITMAP_MAX_RANGE + 1)
308                 return -IPSET_ERR_BITMAP_RANGE_SIZE;
309 
310         pr_debug("hosts %u, elements %llu\n",
311                  hosts, (unsigned long long)elements);
312 
313         set->dsize = ip_set_elem_len(set, tb, 0, 0);
314         map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
315         if (!map)
316                 return -ENOMEM;
317 
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)) {
322                 kfree(map);
323                 return -ENOMEM;
324         }
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);
328         }
329         return 0;
330 }
331 
332 static struct ip_set_type bitmap_ip_type __read_mostly = {
333         .name           = "bitmap:ip",
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,
341         .create_policy  = {
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 },
348         },
349         .adt_policy     = {
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 },
362         },
363         .me             = THIS_MODULE,
364 };
365 
366 static int __init
367 bitmap_ip_init(void)
368 {
369         return ip_set_type_register(&bitmap_ip_type);
370 }
371 
372 static void __exit
373 bitmap_ip_fini(void)
374 {
375         rcu_barrier();
376         ip_set_type_unregister(&bitmap_ip_type);
377 }
378 
379 module_init(bitmap_ip_init);
380 module_exit(bitmap_ip_fini);
381 

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