net/netfilter/ipset/ip_set_bitmap_port.c

   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);