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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         struct ip_set *set;     /* attached to this ip_set */
 44         unsigned char extensions[0]     /* data extensions */
 45                 __aligned(__alignof__(u64));
 46 };
 47 
 48 /* ADT structure for generic function args */
 49 struct bitmap_port_adt_elem {
 50         u16 id;
 51 };
 52 
 53 static inline u16
 54 port_to_id(const struct bitmap_port *m, u16 port)
 55 {
 56         return port - m->first_port;
 57 }
 58 
 59 /* Common functions */
 60 
 61 static inline int
 62 bitmap_port_do_test(const struct bitmap_port_adt_elem *e,
 63                     const struct bitmap_port *map, size_t dsize)
 64 {
 65         return !!test_bit(e->id, map->members);
 66 }
 67 
 68 static inline int
 69 bitmap_port_gc_test(u16 id, const struct bitmap_port *map, size_t dsize)
 70 {
 71         return !!test_bit(id, map->members);
 72 }
 73 
 74 static inline int
 75 bitmap_port_do_add(const struct bitmap_port_adt_elem *e,
 76                    struct bitmap_port *map, u32 flags, size_t dsize)
 77 {
 78         return !!test_bit(e->id, map->members);
 79 }
 80 
 81 static inline int
 82 bitmap_port_do_del(const struct bitmap_port_adt_elem *e,
 83                    struct bitmap_port *map)
 84 {
 85         return !test_and_clear_bit(e->id, map->members);
 86 }
 87 
 88 static inline int
 89 bitmap_port_do_list(struct sk_buff *skb, const struct bitmap_port *map, u32 id,
 90                     size_t dsize)
 91 {
 92         return nla_put_net16(skb, IPSET_ATTR_PORT,
 93                              htons(map->first_port + id));
 94 }
 95 
 96 static inline int
 97 bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map)
 98 {
 99         return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) ||
100                nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
101 }
102 
103 static int
104 bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb,
105                  const struct xt_action_param *par,
106                  enum ipset_adt adt, struct ip_set_adt_opt *opt)
107 {
108         struct bitmap_port *map = set->data;
109         ipset_adtfn adtfn = set->variant->adt[adt];
110         struct bitmap_port_adt_elem e = { .id = 0 };
111         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
112         __be16 __port;
113         u16 port = 0;
114 
115         if (!ip_set_get_ip_port(skb, opt->family,
116                                 opt->flags & IPSET_DIM_ONE_SRC, &__port))
117                 return -EINVAL;
118 
119         port = ntohs(__port);
120 
121         if (port < map->first_port || port > map->last_port)
122                 return -IPSET_ERR_BITMAP_RANGE;
123 
124         e.id = port_to_id(map, port);
125 
126         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
127 }
128 
129 static int
130 bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
131                  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
132 {
133         struct bitmap_port *map = set->data;
134         ipset_adtfn adtfn = set->variant->adt[adt];
135         struct bitmap_port_adt_elem e = { .id = 0 };
136         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
137         u32 port;       /* wraparound */
138         u16 port_to;
139         int ret = 0;
140 
141         if (tb[IPSET_ATTR_LINENO])
142                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
143 
144         if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
145                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
146                 return -IPSET_ERR_PROTOCOL;
147 
148         port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
149         if (port < map->first_port || port > map->last_port)
150                 return -IPSET_ERR_BITMAP_RANGE;
151         ret = ip_set_get_extensions(set, tb, &ext);
152         if (ret)
153                 return ret;
154 
155         if (adt == IPSET_TEST) {
156                 e.id = port_to_id(map, port);
157                 return adtfn(set, &e, &ext, &ext, flags);
158         }
159 
160         if (tb[IPSET_ATTR_PORT_TO]) {
161                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
162                 if (port > port_to) {
163                         swap(port, port_to);
164                         if (port < map->first_port)
165                                 return -IPSET_ERR_BITMAP_RANGE;
166                 }
167         } else {
168                 port_to = port;
169         }
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 
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                a->timeout == b->timeout &&
195                a->extensions == b->extensions;
196 }
197 
198 /* Plain variant */
199 
200 struct bitmap_port_elem {
201 };
202 
203 #include "ip_set_bitmap_gen.h"
204 
205 /* Create bitmap:ip type of sets */
206 
207 static bool
208 init_map_port(struct ip_set *set, struct bitmap_port *map,
209               u16 first_port, u16 last_port)
210 {
211         map->members = ip_set_alloc(map->memsize);
212         if (!map->members)
213                 return false;
214         map->first_port = first_port;
215         map->last_port = last_port;
216         set->timeout = IPSET_NO_TIMEOUT;
217 
218         map->set = set;
219         set->data = map;
220         set->family = NFPROTO_UNSPEC;
221 
222         return true;
223 }
224 
225 static int
226 bitmap_port_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
227                    u32 flags)
228 {
229         struct bitmap_port *map;
230         u16 first_port, last_port;
231         u32 elements;
232 
233         if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
234                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
235                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
236                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
237                 return -IPSET_ERR_PROTOCOL;
238 
239         first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
240         last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
241         if (first_port > last_port)
242                 swap(first_port, last_port);
243 
244         elements = last_port - first_port + 1;
245         set->dsize = ip_set_elem_len(set, tb, 0, 0);
246         map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
247         if (!map)
248                 return -ENOMEM;
249 
250         map->elements = elements;
251         map->memsize = bitmap_bytes(0, map->elements);
252         set->variant = &bitmap_port;
253         if (!init_map_port(set, map, first_port, last_port)) {
254                 kfree(map);
255                 return -ENOMEM;
256         }
257         if (tb[IPSET_ATTR_TIMEOUT]) {
258                 set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
259                 bitmap_port_gc_init(set, bitmap_port_gc);
260         }
261         return 0;
262 }
263 
264 static struct ip_set_type bitmap_port_type = {
265         .name           = "bitmap:port",
266         .protocol       = IPSET_PROTOCOL,
267         .features       = IPSET_TYPE_PORT,
268         .dimension      = IPSET_DIM_ONE,
269         .family         = NFPROTO_UNSPEC,
270         .revision_min   = IPSET_TYPE_REV_MIN,
271         .revision_max   = IPSET_TYPE_REV_MAX,
272         .create         = bitmap_port_create,
273         .create_policy  = {
274                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
275                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
276                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
277                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
278         },
279         .adt_policy     = {
280                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
281                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
282                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
283                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
284                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
285                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
286                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
287                                             .len  = IPSET_MAX_COMMENT_SIZE },
288                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
289                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
290                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
291         },
292         .me             = THIS_MODULE,
293 };
294 
295 static int __init
296 bitmap_port_init(void)
297 {
298         return ip_set_type_register(&bitmap_port_type);
299 }
300 
301 static void __exit
302 bitmap_port_fini(void)
303 {
304         rcu_barrier();
305         ip_set_type_unregister(&bitmap_port_type);
306 }
307 
308 module_init(bitmap_port_init);
309 module_exit(bitmap_port_fini);
310 

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