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 hash:net type */ 9 10 #include <linux/jhash.h> 11 #include <linux/module.h> 12 #include <linux/ip.h> 13 #include <linux/skbuff.h> 14 #include <linux/errno.h> 15 #include <linux/random.h> 16 #include <net/ip.h> 17 #include <net/ipv6.h> 18 #include <net/netlink.h> 19 20 #include <linux/netfilter.h> 21 #include <linux/netfilter/ipset/pfxlen.h> 22 #include <linux/netfilter/ipset/ip_set.h> 23 #include <linux/netfilter/ipset/ip_set_hash.h> 24 25 #define IPSET_TYPE_REV_MIN 0 26 /* 1 Range as input support for IPv4 added */ 27 /* 2 nomatch flag support added */ 28 /* 3 Counters support added */ 29 /* 4 Comments support added */ 30 /* 5 Forceadd support added */ 31 #define IPSET_TYPE_REV_MAX 6 /* skbinfo mapping support added */ 32 33 MODULE_LICENSE("GPL"); 34 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); 35 IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 36 MODULE_ALIAS("ip_set_hash:net"); 37 38 /* Type specific function prefix */ 39 #define HTYPE hash_net 40 #define IP_SET_HASH_WITH_NETS 41 42 /* IPv4 variant */ 43 44 /* Member elements */ 45 struct hash_net4_elem { 46 __be32 ip; 47 u16 padding0; 48 u8 nomatch; 49 u8 cidr; 50 }; 51 52 /* Common functions */ 53 54 static inline bool 55 hash_net4_data_equal(const struct hash_net4_elem *ip1, 56 const struct hash_net4_elem *ip2, 57 u32 *multi) 58 { 59 return ip1->ip == ip2->ip && 60 ip1->cidr == ip2->cidr; 61 } 62 63 static inline int 64 hash_net4_do_data_match(const struct hash_net4_elem *elem) 65 { 66 return elem->nomatch ? -ENOTEMPTY : 1; 67 } 68 69 static inline void 70 hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags) 71 { 72 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 73 } 74 75 static inline void 76 hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags) 77 { 78 swap(*flags, elem->nomatch); 79 } 80 81 static inline void 82 hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr) 83 { 84 elem->ip &= ip_set_netmask(cidr); 85 elem->cidr = cidr; 86 } 87 88 static bool 89 hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data) 90 { 91 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 92 93 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 94 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || 95 (flags && 96 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 97 goto nla_put_failure; 98 return false; 99 100 nla_put_failure: 101 return true; 102 } 103 104 static inline void 105 hash_net4_data_next(struct hash_net4_elem *next, 106 const struct hash_net4_elem *d) 107 { 108 next->ip = d->ip; 109 } 110 111 #define MTYPE hash_net4 112 #define HOST_MASK 32 113 #include "ip_set_hash_gen.h" 114 115 static int 116 hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb, 117 const struct xt_action_param *par, 118 enum ipset_adt adt, struct ip_set_adt_opt *opt) 119 { 120 const struct hash_net *h = set->data; 121 ipset_adtfn adtfn = set->variant->adt[adt]; 122 struct hash_net4_elem e = { 123 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 124 }; 125 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 126 127 if (e.cidr == 0) 128 return -EINVAL; 129 if (adt == IPSET_TEST) 130 e.cidr = HOST_MASK; 131 132 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 133 e.ip &= ip_set_netmask(e.cidr); 134 135 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 136 } 137 138 static int 139 hash_net4_uadt(struct ip_set *set, struct nlattr *tb[], 140 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 141 { 142 const struct hash_net *h = set->data; 143 ipset_adtfn adtfn = set->variant->adt[adt]; 144 struct hash_net4_elem e = { .cidr = HOST_MASK }; 145 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 146 u32 ip = 0, ip_to = 0, last; 147 int ret; 148 149 if (tb[IPSET_ATTR_LINENO]) 150 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 151 152 if (unlikely(!tb[IPSET_ATTR_IP] || 153 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 154 return -IPSET_ERR_PROTOCOL; 155 156 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 157 if (ret) 158 return ret; 159 160 ret = ip_set_get_extensions(set, tb, &ext); 161 if (ret) 162 return ret; 163 164 if (tb[IPSET_ATTR_CIDR]) { 165 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 166 if (!e.cidr || e.cidr > HOST_MASK) 167 return -IPSET_ERR_INVALID_CIDR; 168 } 169 170 if (tb[IPSET_ATTR_CADT_FLAGS]) { 171 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 172 173 if (cadt_flags & IPSET_FLAG_NOMATCH) 174 flags |= (IPSET_FLAG_NOMATCH << 16); 175 } 176 177 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) { 178 e.ip = htonl(ip & ip_set_hostmask(e.cidr)); 179 ret = adtfn(set, &e, &ext, &ext, flags); 180 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 181 ip_set_eexist(ret, flags) ? 0 : ret; 182 } 183 184 ip_to = ip; 185 if (tb[IPSET_ATTR_IP_TO]) { 186 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 187 if (ret) 188 return ret; 189 if (ip_to < ip) 190 swap(ip, ip_to); 191 if (ip + UINT_MAX == ip_to) 192 return -IPSET_ERR_HASH_RANGE; 193 } 194 if (retried) 195 ip = ntohl(h->next.ip); 196 while (!after(ip, ip_to)) { 197 e.ip = htonl(ip); 198 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr); 199 ret = adtfn(set, &e, &ext, &ext, flags); 200 if (ret && !ip_set_eexist(ret, flags)) 201 return ret; 202 203 ret = 0; 204 ip = last + 1; 205 } 206 return ret; 207 } 208 209 /* IPv6 variant */ 210 211 struct hash_net6_elem { 212 union nf_inet_addr ip; 213 u16 padding0; 214 u8 nomatch; 215 u8 cidr; 216 }; 217 218 /* Common functions */ 219 220 static inline bool 221 hash_net6_data_equal(const struct hash_net6_elem *ip1, 222 const struct hash_net6_elem *ip2, 223 u32 *multi) 224 { 225 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 226 ip1->cidr == ip2->cidr; 227 } 228 229 static inline int 230 hash_net6_do_data_match(const struct hash_net6_elem *elem) 231 { 232 return elem->nomatch ? -ENOTEMPTY : 1; 233 } 234 235 static inline void 236 hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags) 237 { 238 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; 239 } 240 241 static inline void 242 hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags) 243 { 244 swap(*flags, elem->nomatch); 245 } 246 247 static inline void 248 hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr) 249 { 250 ip6_netmask(&elem->ip, cidr); 251 elem->cidr = cidr; 252 } 253 254 static bool 255 hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data) 256 { 257 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; 258 259 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 260 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || 261 (flags && 262 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) 263 goto nla_put_failure; 264 return false; 265 266 nla_put_failure: 267 return true; 268 } 269 270 static inline void 271 hash_net6_data_next(struct hash_net4_elem *next, 272 const struct hash_net6_elem *d) 273 { 274 } 275 276 #undef MTYPE 277 #undef HOST_MASK 278 279 #define MTYPE hash_net6 280 #define HOST_MASK 128 281 #define IP_SET_EMIT_CREATE 282 #include "ip_set_hash_gen.h" 283 284 static int 285 hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb, 286 const struct xt_action_param *par, 287 enum ipset_adt adt, struct ip_set_adt_opt *opt) 288 { 289 const struct hash_net *h = set->data; 290 ipset_adtfn adtfn = set->variant->adt[adt]; 291 struct hash_net6_elem e = { 292 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), 293 }; 294 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 295 296 if (e.cidr == 0) 297 return -EINVAL; 298 if (adt == IPSET_TEST) 299 e.cidr = HOST_MASK; 300 301 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 302 ip6_netmask(&e.ip, e.cidr); 303 304 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 305 } 306 307 static int 308 hash_net6_uadt(struct ip_set *set, struct nlattr *tb[], 309 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 310 { 311 ipset_adtfn adtfn = set->variant->adt[adt]; 312 struct hash_net6_elem e = { .cidr = HOST_MASK }; 313 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 314 int ret; 315 316 if (tb[IPSET_ATTR_LINENO]) 317 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 318 319 if (unlikely(!tb[IPSET_ATTR_IP] || 320 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) 321 return -IPSET_ERR_PROTOCOL; 322 if (unlikely(tb[IPSET_ATTR_IP_TO])) 323 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 324 325 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 326 if (ret) 327 return ret; 328 329 ret = ip_set_get_extensions(set, tb, &ext); 330 if (ret) 331 return ret; 332 333 if (tb[IPSET_ATTR_CIDR]) { 334 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 335 if (!e.cidr || e.cidr > HOST_MASK) 336 return -IPSET_ERR_INVALID_CIDR; 337 } 338 339 ip6_netmask(&e.ip, e.cidr); 340 341 if (tb[IPSET_ATTR_CADT_FLAGS]) { 342 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 343 344 if (cadt_flags & IPSET_FLAG_NOMATCH) 345 flags |= (IPSET_FLAG_NOMATCH << 16); 346 } 347 348 ret = adtfn(set, &e, &ext, &ext, flags); 349 350 return ip_set_enomatch(ret, flags, adt, set) ? -ret : 351 ip_set_eexist(ret, flags) ? 0 : ret; 352 } 353 354 static struct ip_set_type hash_net_type __read_mostly = { 355 .name = "hash:net", 356 .protocol = IPSET_PROTOCOL, 357 .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH, 358 .dimension = IPSET_DIM_ONE, 359 .family = NFPROTO_UNSPEC, 360 .revision_min = IPSET_TYPE_REV_MIN, 361 .revision_max = IPSET_TYPE_REV_MAX, 362 .create = hash_net_create, 363 .create_policy = { 364 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 365 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 366 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 367 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 368 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 369 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 370 }, 371 .adt_policy = { 372 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 373 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 374 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 375 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 376 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 377 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 378 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 379 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 380 .len = IPSET_MAX_COMMENT_SIZE }, 381 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 382 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 383 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 384 }, 385 .me = THIS_MODULE, 386 }; 387 388 static int __init 389 hash_net_init(void) 390 { 391 return ip_set_type_register(&hash_net_type); 392 } 393 394 static void __exit 395 hash_net_fini(void) 396 { 397 rcu_barrier(); 398 ip_set_type_unregister(&hash_net_type); 399 } 400 401 module_init(hash_net_init); 402 module_exit(hash_net_fini); 403