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 struct ip_set *set; /* attached to this ip_set */ 52 unsigned char extensions[0] /* data extensions */ 53 __aligned(__alignof__(u64)); 54 }; 55 56 /* ADT structure for generic function args */ 57 struct bitmap_ip_adt_elem { 58 u16 id; 59 }; 60 61 static inline u32 62 ip_to_id(const struct bitmap_ip *m, u32 ip) 63 { 64 return ((ip & ip_set_hostmask(m->netmask)) - m->first_ip) / m->hosts; 65 } 66 67 /* Common functions */ 68 69 static inline int 70 bitmap_ip_do_test(const struct bitmap_ip_adt_elem *e, 71 struct bitmap_ip *map, size_t dsize) 72 { 73 return !!test_bit(e->id, map->members); 74 } 75 76 static inline int 77 bitmap_ip_gc_test(u16 id, const struct bitmap_ip *map, size_t dsize) 78 { 79 return !!test_bit(id, map->members); 80 } 81 82 static inline int 83 bitmap_ip_do_add(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map, 84 u32 flags, size_t dsize) 85 { 86 return !!test_bit(e->id, map->members); 87 } 88 89 static inline int 90 bitmap_ip_do_del(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map) 91 { 92 return !test_and_clear_bit(e->id, map->members); 93 } 94 95 static inline int 96 bitmap_ip_do_list(struct sk_buff *skb, const struct bitmap_ip *map, u32 id, 97 size_t dsize) 98 { 99 return nla_put_ipaddr4(skb, IPSET_ATTR_IP, 100 htonl(map->first_ip + id * map->hosts)); 101 } 102 103 static inline int 104 bitmap_ip_do_head(struct sk_buff *skb, const struct bitmap_ip *map) 105 { 106 return nla_put_ipaddr4(skb, IPSET_ATTR_IP, htonl(map->first_ip)) || 107 nla_put_ipaddr4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip)) || 108 (map->netmask != 32 && 109 nla_put_u8(skb, IPSET_ATTR_NETMASK, map->netmask)); 110 } 111 112 static int 113 bitmap_ip_kadt(struct ip_set *set, const struct sk_buff *skb, 114 const struct xt_action_param *par, 115 enum ipset_adt adt, struct ip_set_adt_opt *opt) 116 { 117 struct bitmap_ip *map = set->data; 118 ipset_adtfn adtfn = set->variant->adt[adt]; 119 struct bitmap_ip_adt_elem e = { .id = 0 }; 120 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 121 u32 ip; 122 123 ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC)); 124 if (ip < map->first_ip || ip > map->last_ip) 125 return -IPSET_ERR_BITMAP_RANGE; 126 127 e.id = ip_to_id(map, ip); 128 129 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 130 } 131 132 static int 133 bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[], 134 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 135 { 136 struct bitmap_ip *map = set->data; 137 ipset_adtfn adtfn = set->variant->adt[adt]; 138 u32 ip = 0, ip_to = 0; 139 struct bitmap_ip_adt_elem e = { .id = 0 }; 140 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 141 int ret = 0; 142 143 if (tb[IPSET_ATTR_LINENO]) 144 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 145 146 if (unlikely(!tb[IPSET_ATTR_IP])) 147 return -IPSET_ERR_PROTOCOL; 148 149 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 150 if (ret) 151 return ret; 152 153 ret = ip_set_get_extensions(set, tb, &ext); 154 if (ret) 155 return ret; 156 157 if (ip < map->first_ip || ip > map->last_ip) 158 return -IPSET_ERR_BITMAP_RANGE; 159 160 if (adt == IPSET_TEST) { 161 e.id = ip_to_id(map, ip); 162 return adtfn(set, &e, &ext, &ext, flags); 163 } 164 165 if (tb[IPSET_ATTR_IP_TO]) { 166 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 167 if (ret) 168 return ret; 169 if (ip > ip_to) { 170 swap(ip, ip_to); 171 if (ip < map->first_ip) 172 return -IPSET_ERR_BITMAP_RANGE; 173 } 174 } else if (tb[IPSET_ATTR_CIDR]) { 175 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 176 177 if (!cidr || cidr > HOST_MASK) 178 return -IPSET_ERR_INVALID_CIDR; 179 ip_set_mask_from_to(ip, ip_to, cidr); 180 } else { 181 ip_to = ip; 182 } 183 184 if (ip_to > map->last_ip) 185 return -IPSET_ERR_BITMAP_RANGE; 186 187 for (; !before(ip_to, ip); ip += map->hosts) { 188 e.id = ip_to_id(map, ip); 189 ret = adtfn(set, &e, &ext, &ext, flags); 190 191 if (ret && !ip_set_eexist(ret, flags)) 192 return ret; 193 194 ret = 0; 195 } 196 return ret; 197 } 198 199 static bool 200 bitmap_ip_same_set(const struct ip_set *a, const struct ip_set *b) 201 { 202 const struct bitmap_ip *x = a->data; 203 const struct bitmap_ip *y = b->data; 204 205 return x->first_ip == y->first_ip && 206 x->last_ip == y->last_ip && 207 x->netmask == y->netmask && 208 a->timeout == b->timeout && 209 a->extensions == b->extensions; 210 } 211 212 /* Plain variant */ 213 214 struct bitmap_ip_elem { 215 }; 216 217 #include "ip_set_bitmap_gen.h" 218 219 /* Create bitmap:ip type of sets */ 220 221 static bool 222 init_map_ip(struct ip_set *set, struct bitmap_ip *map, 223 u32 first_ip, u32 last_ip, 224 u32 elements, u32 hosts, u8 netmask) 225 { 226 map->members = ip_set_alloc(map->memsize); 227 if (!map->members) 228 return false; 229 map->first_ip = first_ip; 230 map->last_ip = last_ip; 231 map->elements = elements; 232 map->hosts = hosts; 233 map->netmask = netmask; 234 set->timeout = IPSET_NO_TIMEOUT; 235 236 map->set = set; 237 set->data = map; 238 set->family = NFPROTO_IPV4; 239 240 return true; 241 } 242 243 static int 244 bitmap_ip_create(struct net *net, struct ip_set *set, struct nlattr *tb[], 245 u32 flags) 246 { 247 struct bitmap_ip *map; 248 u32 first_ip = 0, last_ip = 0, hosts; 249 u64 elements; 250 u8 netmask = 32; 251 int ret; 252 253 if (unlikely(!tb[IPSET_ATTR_IP] || 254 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || 255 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 256 return -IPSET_ERR_PROTOCOL; 257 258 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip); 259 if (ret) 260 return ret; 261 262 if (tb[IPSET_ATTR_IP_TO]) { 263 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip); 264 if (ret) 265 return ret; 266 if (first_ip > last_ip) { 267 u32 tmp = first_ip; 268 269 first_ip = last_ip; 270 last_ip = tmp; 271 } 272 } else if (tb[IPSET_ATTR_CIDR]) { 273 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 274 275 if (cidr >= HOST_MASK) 276 return -IPSET_ERR_INVALID_CIDR; 277 ip_set_mask_from_to(first_ip, last_ip, cidr); 278 } else { 279 return -IPSET_ERR_PROTOCOL; 280 } 281 282 if (tb[IPSET_ATTR_NETMASK]) { 283 netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]); 284 285 if (netmask > HOST_MASK) 286 return -IPSET_ERR_INVALID_NETMASK; 287 288 first_ip &= ip_set_hostmask(netmask); 289 last_ip |= ~ip_set_hostmask(netmask); 290 } 291 292 if (netmask == 32) { 293 hosts = 1; 294 elements = (u64)last_ip - first_ip + 1; 295 } else { 296 u8 mask_bits; 297 u32 mask; 298 299 mask = range_to_mask(first_ip, last_ip, &mask_bits); 300 301 if ((!mask && (first_ip || last_ip != 0xFFFFFFFF)) || 302 netmask <= mask_bits) 303 return -IPSET_ERR_BITMAP_RANGE; 304 305 pr_debug("mask_bits %u, netmask %u\n", mask_bits, netmask); 306 hosts = 2 << (32 - netmask - 1); 307 elements = 2 << (netmask - mask_bits - 1); 308 } 309 if (elements > IPSET_BITMAP_MAX_RANGE + 1) 310 return -IPSET_ERR_BITMAP_RANGE_SIZE; 311 312 pr_debug("hosts %u, elements %llu\n", 313 hosts, (unsigned long long)elements); 314 315 set->dsize = ip_set_elem_len(set, tb, 0, 0); 316 map = ip_set_alloc(sizeof(*map) + elements * set->dsize); 317 if (!map) 318 return -ENOMEM; 319 320 map->memsize = bitmap_bytes(0, elements - 1); 321 set->variant = &bitmap_ip; 322 if (!init_map_ip(set, map, first_ip, last_ip, 323 elements, hosts, netmask)) { 324 kfree(map); 325 return -ENOMEM; 326 } 327 if (tb[IPSET_ATTR_TIMEOUT]) { 328 set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); 329 bitmap_ip_gc_init(set, bitmap_ip_gc); 330 } 331 return 0; 332 } 333 334 static struct ip_set_type bitmap_ip_type __read_mostly = { 335 .name = "bitmap:ip", 336 .protocol = IPSET_PROTOCOL, 337 .features = IPSET_TYPE_IP, 338 .dimension = IPSET_DIM_ONE, 339 .family = NFPROTO_IPV4, 340 .revision_min = IPSET_TYPE_REV_MIN, 341 .revision_max = IPSET_TYPE_REV_MAX, 342 .create = bitmap_ip_create, 343 .create_policy = { 344 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 345 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 346 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 347 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 }, 348 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 349 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 350 }, 351 .adt_policy = { 352 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 353 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 354 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 355 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 356 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 357 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 358 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 359 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 360 .len = IPSET_MAX_COMMENT_SIZE }, 361 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 362 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 363 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 364 }, 365 .me = THIS_MODULE, 366 }; 367 368 static int __init 369 bitmap_ip_init(void) 370 { 371 return ip_set_type_register(&bitmap_ip_type); 372 } 373 374 static void __exit 375 bitmap_ip_fini(void) 376 { 377 rcu_barrier(); 378 ip_set_type_unregister(&bitmap_ip_type); 379 } 380 381 module_init(bitmap_ip_init); 382 module_exit(bitmap_ip_fini); 383