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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 IPSET_TYPE_REV_MIN      0
 24 /*                              1          Counter support added */
 25 /*                              2          Comment support added */
 26 #define IPSET_TYPE_REV_MAX      3       /* skbinfo support added */
 27 
 28 MODULE_LICENSE("GPL");
 29 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
 30 IP_SET_MODULE_DESC("bitmap:port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 31 MODULE_ALIAS("ip_set_bitmap:port");
 32 
 33 #define MTYPE           bitmap_port
 34 
 35 /* Type structure */
 36 struct bitmap_port {
 37         void *members;          /* the set members */
 38         u16 first_port;         /* host byte order, included in range */
 39         u16 last_port;          /* host byte order, included in range */
 40         u32 elements;           /* number of max elements in the set */
 41         size_t memsize;         /* members size */
 42         struct timer_list gc;   /* garbage collection */
 43         unsigned char extensions[0]     /* data extensions */
 44                 __aligned(__alignof__(u64));
 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, size_t dsize)
 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, size_t dsize)
 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, size_t dsize)
 76 {
 77         return !!test_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                     size_t dsize)
 90 {
 91         return nla_put_net16(skb, IPSET_ATTR_PORT,
 92                              htons(map->first_port + id));
 93 }
 94 
 95 static inline int
 96 bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map)
 97 {
 98         return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) ||
 99                nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
100 }
101 
102 static int
103 bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb,
104                  const struct xt_action_param *par,
105                  enum ipset_adt adt, struct ip_set_adt_opt *opt)
106 {
107         struct bitmap_port *map = set->data;
108         ipset_adtfn adtfn = set->variant->adt[adt];
109         struct bitmap_port_adt_elem e = { .id = 0 };
110         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
111         __be16 __port;
112         u16 port = 0;
113 
114         if (!ip_set_get_ip_port(skb, opt->family,
115                                 opt->flags & IPSET_DIM_ONE_SRC, &__port))
116                 return -EINVAL;
117 
118         port = ntohs(__port);
119 
120         if (port < map->first_port || port > map->last_port)
121                 return -IPSET_ERR_BITMAP_RANGE;
122 
123         e.id = port_to_id(map, port);
124 
125         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
126 }
127 
128 static int
129 bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
130                  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
131 {
132         struct bitmap_port *map = set->data;
133         ipset_adtfn adtfn = set->variant->adt[adt];
134         struct bitmap_port_adt_elem e = { .id = 0 };
135         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
136         u32 port;       /* wraparound */
137         u16 port_to;
138         int ret = 0;
139 
140         if (tb[IPSET_ATTR_LINENO])
141                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
142 
143         if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
144                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
145                 return -IPSET_ERR_PROTOCOL;
146 
147         port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
148         if (port < map->first_port || port > map->last_port)
149                 return -IPSET_ERR_BITMAP_RANGE;
150         ret = ip_set_get_extensions(set, tb, &ext);
151         if (ret)
152                 return ret;
153 
154         if (adt == IPSET_TEST) {
155                 e.id = port_to_id(map, port);
156                 return adtfn(set, &e, &ext, &ext, flags);
157         }
158 
159         if (tb[IPSET_ATTR_PORT_TO]) {
160                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
161                 if (port > port_to) {
162                         swap(port, port_to);
163                         if (port < map->first_port)
164                                 return -IPSET_ERR_BITMAP_RANGE;
165                 }
166         } else {
167                 port_to = port;
168         }
169 
170         if (port_to > map->last_port)
171                 return -IPSET_ERR_BITMAP_RANGE;
172 
173         for (; port <= port_to; port++) {
174                 e.id = port_to_id(map, port);
175                 ret = adtfn(set, &e, &ext, &ext, flags);
176 
177                 if (ret && !ip_set_eexist(ret, flags))
178                         return ret;
179 
180                 ret = 0;
181         }
182         return ret;
183 }
184 
185 static bool
186 bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b)
187 {
188         const struct bitmap_port *x = a->data;
189         const struct bitmap_port *y = b->data;
190 
191         return x->first_port == y->first_port &&
192                x->last_port == y->last_port &&
193                a->timeout == b->timeout &&
194                a->extensions == b->extensions;
195 }
196 
197 /* Plain variant */
198 
199 struct bitmap_port_elem {
200 };
201 
202 #include "ip_set_bitmap_gen.h"
203 
204 /* Create bitmap:ip type of sets */
205 
206 static bool
207 init_map_port(struct ip_set *set, struct bitmap_port *map,
208               u16 first_port, u16 last_port)
209 {
210         map->members = ip_set_alloc(map->memsize);
211         if (!map->members)
212                 return false;
213         map->first_port = first_port;
214         map->last_port = last_port;
215         set->timeout = IPSET_NO_TIMEOUT;
216 
217         set->data = map;
218         set->family = NFPROTO_UNSPEC;
219 
220         return true;
221 }
222 
223 static int
224 bitmap_port_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
225                    u32 flags)
226 {
227         struct bitmap_port *map;
228         u16 first_port, last_port;
229         u32 elements;
230 
231         if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
232                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
233                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
234                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
235                 return -IPSET_ERR_PROTOCOL;
236 
237         first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
238         last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
239         if (first_port > last_port) {
240                 u16 tmp = first_port;
241 
242                 first_port = last_port;
243                 last_port = tmp;
244         }
245 
246         elements = last_port - first_port + 1;
247         set->dsize = ip_set_elem_len(set, tb, 0, 0);
248         map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
249         if (!map)
250                 return -ENOMEM;
251 
252         map->elements = elements;
253         map->memsize = bitmap_bytes(0, map->elements);
254         set->variant = &bitmap_port;
255         if (!init_map_port(set, map, first_port, last_port)) {
256                 kfree(map);
257                 return -ENOMEM;
258         }
259         if (tb[IPSET_ATTR_TIMEOUT]) {
260                 set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
261                 bitmap_port_gc_init(set, bitmap_port_gc);
262         }
263         return 0;
264 }
265 
266 static struct ip_set_type bitmap_port_type = {
267         .name           = "bitmap:port",
268         .protocol       = IPSET_PROTOCOL,
269         .features       = IPSET_TYPE_PORT,
270         .dimension      = IPSET_DIM_ONE,
271         .family         = NFPROTO_UNSPEC,
272         .revision_min   = IPSET_TYPE_REV_MIN,
273         .revision_max   = IPSET_TYPE_REV_MAX,
274         .create         = bitmap_port_create,
275         .create_policy  = {
276                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
277                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
278                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
279                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
280         },
281         .adt_policy     = {
282                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
283                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
284                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
285                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
286                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
287                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
288                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
289                                             .len  = IPSET_MAX_COMMENT_SIZE },
290                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
291                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
292                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
293         },
294         .me             = THIS_MODULE,
295 };
296 
297 static int __init
298 bitmap_port_init(void)
299 {
300         return ip_set_type_register(&bitmap_port_type);
301 }
302 
303 static void __exit
304 bitmap_port_fini(void)
305 {
306         rcu_barrier();
307         ip_set_type_unregister(&bitmap_port_type);
308 }
309 
310 module_init(bitmap_port_init);
311 module_exit(bitmap_port_fini);
312 

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