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Linux/net/netfilter/ipset/ip_set_bitmap_port.c

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  1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  2  *
  3  * This program is free software; you can redistribute it and/or modify
  4  * it under the terms of the GNU General Public License version 2 as
  5  * published by the Free Software Foundation.
  6  */
  7 
  8 /* Kernel module implementing an IP set type: the bitmap:port type */
  9 
 10 #include <linux/module.h>
 11 #include <linux/ip.h>
 12 #include <linux/skbuff.h>
 13 #include <linux/errno.h>
 14 #include <linux/netlink.h>
 15 #include <linux/jiffies.h>
 16 #include <linux/timer.h>
 17 #include <net/netlink.h>
 18 
 19 #include <linux/netfilter/ipset/ip_set.h>
 20 #include <linux/netfilter/ipset/ip_set_bitmap.h>
 21 #include <linux/netfilter/ipset/ip_set_getport.h>
 22 
 23 #define REVISION_MIN    0
 24 #define REVISION_MAX    1       /* Counter support added */
 25 
 26 MODULE_LICENSE("GPL");
 27 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
 28 IP_SET_MODULE_DESC("bitmap:port", REVISION_MIN, REVISION_MAX);
 29 MODULE_ALIAS("ip_set_bitmap:port");
 30 
 31 #define MTYPE           bitmap_port
 32 
 33 /* Type structure */
 34 struct bitmap_port {
 35         void *members;          /* the set members */
 36         void *extensions;       /* data extensions */
 37         u16 first_port;         /* host byte order, included in range */
 38         u16 last_port;          /* host byte order, included in range */
 39         u32 elements;           /* number of max elements in the set */
 40         size_t memsize;         /* members size */
 41         size_t dsize;           /* extensions struct size */
 42         size_t offset[IPSET_OFFSET_MAX]; /* Offsets to extensions */
 43         u32 timeout;            /* timeout parameter */
 44         struct timer_list gc;   /* garbage collection */
 45 };
 46 
 47 /* ADT structure for generic function args */
 48 struct bitmap_port_adt_elem {
 49         u16 id;
 50 };
 51 
 52 static inline u16
 53 port_to_id(const struct bitmap_port *m, u16 port)
 54 {
 55         return port - m->first_port;
 56 }
 57 
 58 /* Common functions */
 59 
 60 static inline int
 61 bitmap_port_do_test(const struct bitmap_port_adt_elem *e,
 62                     const struct bitmap_port *map)
 63 {
 64         return !!test_bit(e->id, map->members);
 65 }
 66 
 67 static inline int
 68 bitmap_port_gc_test(u16 id, const struct bitmap_port *map)
 69 {
 70         return !!test_bit(id, map->members);
 71 }
 72 
 73 static inline int
 74 bitmap_port_do_add(const struct bitmap_port_adt_elem *e,
 75                    struct bitmap_port *map, u32 flags)
 76 {
 77         return !!test_and_set_bit(e->id, map->members);
 78 }
 79 
 80 static inline int
 81 bitmap_port_do_del(const struct bitmap_port_adt_elem *e,
 82                    struct bitmap_port *map)
 83 {
 84         return !test_and_clear_bit(e->id, map->members);
 85 }
 86 
 87 static inline int
 88 bitmap_port_do_list(struct sk_buff *skb, const struct bitmap_port *map, u32 id)
 89 {
 90         return nla_put_net16(skb, IPSET_ATTR_PORT,
 91                              htons(map->first_port + id));
 92 }
 93 
 94 static inline int
 95 bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map)
 96 {
 97         return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) ||
 98                nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
 99 }
100 
101 static int
102 bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb,
103                  const struct xt_action_param *par,
104                  enum ipset_adt adt, struct ip_set_adt_opt *opt)
105 {
106         struct bitmap_port *map = set->data;
107         ipset_adtfn adtfn = set->variant->adt[adt];
108         struct bitmap_port_adt_elem e = {};
109         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, map);
110         __be16 __port;
111         u16 port = 0;
112 
113         if (!ip_set_get_ip_port(skb, opt->family,
114                                 opt->flags & IPSET_DIM_ONE_SRC, &__port))
115                 return -EINVAL;
116 
117         port = ntohs(__port);
118 
119         if (port < map->first_port || port > map->last_port)
120                 return -IPSET_ERR_BITMAP_RANGE;
121 
122         e.id = port_to_id(map, port);
123 
124         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
125 }
126 
127 static int
128 bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
129                  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
130 {
131         struct bitmap_port *map = set->data;
132         ipset_adtfn adtfn = set->variant->adt[adt];
133         struct bitmap_port_adt_elem e = {};
134         struct ip_set_ext ext = IP_SET_INIT_UEXT(map);
135         u32 port;       /* wraparound */
136         u16 port_to;
137         int ret = 0;
138 
139         if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
140                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
141                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
142                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
143                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
144                 return -IPSET_ERR_PROTOCOL;
145 
146         if (tb[IPSET_ATTR_LINENO])
147                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
148 
149         port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
150         if (port < map->first_port || port > map->last_port)
151                 return -IPSET_ERR_BITMAP_RANGE;
152         ret = ip_set_get_extensions(set, tb, &ext);
153         if (ret)
154                 return ret;
155 
156         if (adt == IPSET_TEST) {
157                 e.id = port_to_id(map, port);
158                 return adtfn(set, &e, &ext, &ext, flags);
159         }
160 
161         if (tb[IPSET_ATTR_PORT_TO]) {
162                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
163                 if (port > port_to) {
164                         swap(port, port_to);
165                         if (port < map->first_port)
166                                 return -IPSET_ERR_BITMAP_RANGE;
167                 }
168         } else
169                 port_to = port;
170 
171         if (port_to > map->last_port)
172                 return -IPSET_ERR_BITMAP_RANGE;
173 
174         for (; port <= port_to; port++) {
175                 e.id = port_to_id(map, port);
176                 ret = adtfn(set, &e, &ext, &ext, flags);
177 
178                 if (ret && !ip_set_eexist(ret, flags))
179                         return ret;
180                 else
181                         ret = 0;
182         }
183         return ret;
184 }
185 
186 static bool
187 bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b)
188 {
189         const struct bitmap_port *x = a->data;
190         const struct bitmap_port *y = b->data;
191 
192         return x->first_port == y->first_port &&
193                x->last_port == y->last_port &&
194                x->timeout == y->timeout &&
195                a->extensions == b->extensions;
196 }
197 
198 /* Plain variant */
199 
200 struct bitmap_port_elem {
201 };
202 
203 /* Timeout variant */
204 
205 struct bitmap_portt_elem {
206         unsigned long timeout;
207 };
208 
209 /* Plain variant with counter */
210 
211 struct bitmap_portc_elem {
212         struct ip_set_counter counter;
213 };
214 
215 /* Timeout variant with counter */
216 
217 struct bitmap_portct_elem {
218         unsigned long timeout;
219         struct ip_set_counter counter;
220 };
221 
222 #include "ip_set_bitmap_gen.h"
223 
224 /* Create bitmap:ip type of sets */
225 
226 static bool
227 init_map_port(struct ip_set *set, struct bitmap_port *map,
228               u16 first_port, u16 last_port)
229 {
230         map->members = ip_set_alloc(map->memsize);
231         if (!map->members)
232                 return false;
233         if (map->dsize) {
234                 map->extensions = ip_set_alloc(map->dsize * map->elements);
235                 if (!map->extensions) {
236                         kfree(map->members);
237                         return false;
238                 }
239         }
240         map->first_port = first_port;
241         map->last_port = last_port;
242         map->timeout = IPSET_NO_TIMEOUT;
243 
244         set->data = map;
245         set->family = NFPROTO_UNSPEC;
246 
247         return true;
248 }
249 
250 static int
251 bitmap_port_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
252 {
253         struct bitmap_port *map;
254         u16 first_port, last_port;
255         u32 cadt_flags = 0;
256 
257         if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
258                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
259                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
260                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
261                 return -IPSET_ERR_PROTOCOL;
262 
263         first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
264         last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
265         if (first_port > last_port) {
266                 u16 tmp = first_port;
267 
268                 first_port = last_port;
269                 last_port = tmp;
270         }
271 
272         map = kzalloc(sizeof(*map), GFP_KERNEL);
273         if (!map)
274                 return -ENOMEM;
275 
276         map->elements = last_port - first_port + 1;
277         map->memsize = map->elements * sizeof(unsigned long);
278         set->variant = &bitmap_port;
279         if (tb[IPSET_ATTR_CADT_FLAGS])
280                 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
281         if (cadt_flags & IPSET_FLAG_WITH_COUNTERS) {
282                 set->extensions |= IPSET_EXT_COUNTER;
283                 if (tb[IPSET_ATTR_TIMEOUT]) {
284                         map->dsize = sizeof(struct bitmap_portct_elem);
285                         map->offset[IPSET_OFFSET_TIMEOUT] =
286                                 offsetof(struct bitmap_portct_elem, timeout);
287                         map->offset[IPSET_OFFSET_COUNTER] =
288                                 offsetof(struct bitmap_portct_elem, counter);
289                         if (!init_map_port(set, map, first_port, last_port)) {
290                                 kfree(map);
291                                 return -ENOMEM;
292                         }
293 
294                         map->timeout =
295                                 ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
296                         set->extensions |= IPSET_EXT_TIMEOUT;
297                         bitmap_port_gc_init(set, bitmap_port_gc);
298                 } else {
299                         map->dsize = sizeof(struct bitmap_portc_elem);
300                         map->offset[IPSET_OFFSET_COUNTER] =
301                                 offsetof(struct bitmap_portc_elem, counter);
302                         if (!init_map_port(set, map, first_port, last_port)) {
303                                 kfree(map);
304                                 return -ENOMEM;
305                         }
306                 }
307         } else if (tb[IPSET_ATTR_TIMEOUT]) {
308                 map->dsize = sizeof(struct bitmap_portt_elem);
309                 map->offset[IPSET_OFFSET_TIMEOUT] =
310                         offsetof(struct bitmap_portt_elem, timeout);
311                 if (!init_map_port(set, map, first_port, last_port)) {
312                         kfree(map);
313                         return -ENOMEM;
314                 }
315 
316                 map->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
317                 set->extensions |= IPSET_EXT_TIMEOUT;
318                 bitmap_port_gc_init(set, bitmap_port_gc);
319         } else {
320                 map->dsize = 0;
321                 if (!init_map_port(set, map, first_port, last_port)) {
322                         kfree(map);
323                         return -ENOMEM;
324                 }
325 
326         }
327         return 0;
328 }
329 
330 static struct ip_set_type bitmap_port_type = {
331         .name           = "bitmap:port",
332         .protocol       = IPSET_PROTOCOL,
333         .features       = IPSET_TYPE_PORT,
334         .dimension      = IPSET_DIM_ONE,
335         .family         = NFPROTO_UNSPEC,
336         .revision_min   = REVISION_MIN,
337         .revision_max   = REVISION_MAX,
338         .create         = bitmap_port_create,
339         .create_policy  = {
340                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
341                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
342                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
343                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
344         },
345         .adt_policy     = {
346                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
347                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
348                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
349                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
350                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
351                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
352         },
353         .me             = THIS_MODULE,
354 };
355 
356 static int __init
357 bitmap_port_init(void)
358 {
359         return ip_set_type_register(&bitmap_port_type);
360 }
361 
362 static void __exit
363 bitmap_port_fini(void)
364 {
365         ip_set_type_unregister(&bitmap_port_type);
366 }
367 
368 module_init(bitmap_port_init);
369 module_exit(bitmap_port_fini);
370 

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