1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */ 3 4 /* Kernel module implementing an IP set type: the hash:ip,port type */ 5 6 #include <linux/jhash.h> 7 #include <linux/module.h> 8 #include <linux/ip.h> 9 #include <linux/skbuff.h> 10 #include <linux/errno.h> 11 #include <linux/random.h> 12 #include <net/ip.h> 13 #include <net/ipv6.h> 14 #include <net/netlink.h> 15 #include <net/tcp.h> 16 17 #include <linux/netfilter.h> 18 #include <linux/netfilter/ipset/pfxlen.h> 19 #include <linux/netfilter/ipset/ip_set.h> 20 #include <linux/netfilter/ipset/ip_set_getport.h> 21 #include <linux/netfilter/ipset/ip_set_hash.h> 22 23 #define IPSET_TYPE_REV_MIN 0 24 /* 1 SCTP and UDPLITE support added */ 25 /* 2 Counters support added */ 26 /* 3 Comments support added */ 27 /* 4 Forceadd support added */ 28 /* 5 skbinfo support added */ 29 /* 6 bucketsize, initval support added */ 30 #define IPSET_TYPE_REV_MAX 7 /* bitmask support added */ 31 32 MODULE_LICENSE("GPL"); 33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 34 IP_SET_MODULE_DESC("hash:ip,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 35 MODULE_ALIAS("ip_set_hash:ip,port"); 36 37 /* Type specific function prefix */ 38 #define HTYPE hash_ipport 39 #define IP_SET_HASH_WITH_NETMASK 40 #define IP_SET_HASH_WITH_BITMASK 41 42 /* IPv4 variant */ 43 44 /* Member elements */ 45 struct hash_ipport4_elem { 46 __be32 ip; 47 __be16 port; 48 u8 proto; 49 u8 padding; 50 }; 51 52 /* Common functions */ 53 54 static bool 55 hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1, 56 const struct hash_ipport4_elem *ip2, 57 u32 *multi) 58 { 59 return ip1->ip == ip2->ip && 60 ip1->port == ip2->port && 61 ip1->proto == ip2->proto; 62 } 63 64 static bool 65 hash_ipport4_data_list(struct sk_buff *skb, 66 const struct hash_ipport4_elem *data) 67 { 68 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 69 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 70 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto)) 71 goto nla_put_failure; 72 return false; 73 74 nla_put_failure: 75 return true; 76 } 77 78 static void 79 hash_ipport4_data_next(struct hash_ipport4_elem *next, 80 const struct hash_ipport4_elem *d) 81 { 82 next->ip = d->ip; 83 next->port = d->port; 84 } 85 86 #define MTYPE hash_ipport4 87 #define HOST_MASK 32 88 #include "ip_set_hash_gen.h" 89 90 static int 91 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb, 92 const struct xt_action_param *par, 93 enum ipset_adt adt, struct ip_set_adt_opt *opt) 94 { 95 ipset_adtfn adtfn = set->variant->adt[adt]; 96 struct hash_ipport4_elem e = { .ip = 0 }; 97 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 98 const struct MTYPE *h = set->data; 99 100 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 101 &e.port, &e.proto)) 102 return -EINVAL; 103 104 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 105 e.ip &= h->bitmask.ip; 106 if (e.ip == 0) 107 return -EINVAL; 108 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 109 } 110 111 static int 112 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[], 113 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 114 { 115 struct hash_ipport4 *h = set->data; 116 ipset_adtfn adtfn = set->variant->adt[adt]; 117 struct hash_ipport4_elem e = { .ip = 0 }; 118 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 119 u32 ip, ip_to = 0, p = 0, port, port_to, i = 0; 120 bool with_ports = false; 121 int ret; 122 123 if (tb[IPSET_ATTR_LINENO]) 124 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 125 126 if (unlikely(!tb[IPSET_ATTR_IP] || 127 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 128 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) 129 return -IPSET_ERR_PROTOCOL; 130 131 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip); 132 if (ret) 133 return ret; 134 135 ret = ip_set_get_extensions(set, tb, &ext); 136 if (ret) 137 return ret; 138 139 e.ip &= h->bitmask.ip; 140 if (e.ip == 0) 141 return -EINVAL; 142 143 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 144 145 if (tb[IPSET_ATTR_PROTO]) { 146 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 147 with_ports = ip_set_proto_with_ports(e.proto); 148 149 if (e.proto == 0) 150 return -IPSET_ERR_INVALID_PROTO; 151 } else { 152 return -IPSET_ERR_MISSING_PROTO; 153 } 154 155 if (!(with_ports || e.proto == IPPROTO_ICMP)) 156 e.port = 0; 157 158 if (adt == IPSET_TEST || 159 !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] || 160 tb[IPSET_ATTR_PORT_TO])) { 161 ret = adtfn(set, &e, &ext, &ext, flags); 162 return ip_set_eexist(ret, flags) ? 0 : ret; 163 } 164 165 ip_to = ip = ntohl(e.ip); 166 if (tb[IPSET_ATTR_IP_TO]) { 167 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 168 if (ret) 169 return ret; 170 if (ip > ip_to) 171 swap(ip, ip_to); 172 } else if (tb[IPSET_ATTR_CIDR]) { 173 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 174 175 if (!cidr || cidr > HOST_MASK) 176 return -IPSET_ERR_INVALID_CIDR; 177 ip_set_mask_from_to(ip, ip_to, cidr); 178 } 179 180 port_to = port = ntohs(e.port); 181 if (with_ports && tb[IPSET_ATTR_PORT_TO]) { 182 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 183 if (port > port_to) 184 swap(port, port_to); 185 } 186 187 if (retried) 188 ip = ntohl(h->next.ip); 189 for (; ip <= ip_to; ip++) { 190 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port) 191 : port; 192 for (; p <= port_to; p++, i++) { 193 e.ip = htonl(ip); 194 e.port = htons(p); 195 if (i > IPSET_MAX_RANGE) { 196 hash_ipport4_data_next(&h->next, &e); 197 return -ERANGE; 198 } 199 ret = adtfn(set, &e, &ext, &ext, flags); 200 201 if (ret && !ip_set_eexist(ret, flags)) 202 return ret; 203 204 ret = 0; 205 } 206 } 207 return ret; 208 } 209 210 /* IPv6 variant */ 211 212 struct hash_ipport6_elem { 213 union nf_inet_addr ip; 214 __be16 port; 215 u8 proto; 216 u8 padding; 217 }; 218 219 /* Common functions */ 220 221 static bool 222 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1, 223 const struct hash_ipport6_elem *ip2, 224 u32 *multi) 225 { 226 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 227 ip1->port == ip2->port && 228 ip1->proto == ip2->proto; 229 } 230 231 static bool 232 hash_ipport6_data_list(struct sk_buff *skb, 233 const struct hash_ipport6_elem *data) 234 { 235 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 236 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 237 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto)) 238 goto nla_put_failure; 239 return false; 240 241 nla_put_failure: 242 return true; 243 } 244 245 static void 246 hash_ipport6_data_next(struct hash_ipport6_elem *next, 247 const struct hash_ipport6_elem *d) 248 { 249 next->port = d->port; 250 } 251 252 #undef MTYPE 253 #undef HOST_MASK 254 255 #define MTYPE hash_ipport6 256 #define HOST_MASK 128 257 #define IP_SET_EMIT_CREATE 258 #include "ip_set_hash_gen.h" 259 260 static int 261 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb, 262 const struct xt_action_param *par, 263 enum ipset_adt adt, struct ip_set_adt_opt *opt) 264 { 265 ipset_adtfn adtfn = set->variant->adt[adt]; 266 struct hash_ipport6_elem e = { .ip = { .all = { 0 } } }; 267 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 268 const struct MTYPE *h = set->data; 269 270 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 271 &e.port, &e.proto)) 272 return -EINVAL; 273 274 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 275 nf_inet_addr_mask_inplace(&e.ip, &h->bitmask); 276 if (ipv6_addr_any(&e.ip.in6)) 277 return -EINVAL; 278 279 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 280 } 281 282 static int 283 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[], 284 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 285 { 286 const struct hash_ipport6 *h = set->data; 287 ipset_adtfn adtfn = set->variant->adt[adt]; 288 struct hash_ipport6_elem e = { .ip = { .all = { 0 } } }; 289 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 290 u32 port, port_to; 291 bool with_ports = false; 292 int ret; 293 294 if (tb[IPSET_ATTR_LINENO]) 295 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 296 297 if (unlikely(!tb[IPSET_ATTR_IP] || 298 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 299 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) 300 return -IPSET_ERR_PROTOCOL; 301 if (unlikely(tb[IPSET_ATTR_IP_TO])) 302 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 303 if (unlikely(tb[IPSET_ATTR_CIDR])) { 304 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 305 306 if (cidr != HOST_MASK) 307 return -IPSET_ERR_INVALID_CIDR; 308 } 309 310 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 311 if (ret) 312 return ret; 313 314 ret = ip_set_get_extensions(set, tb, &ext); 315 if (ret) 316 return ret; 317 318 nf_inet_addr_mask_inplace(&e.ip, &h->bitmask); 319 if (ipv6_addr_any(&e.ip.in6)) 320 return -EINVAL; 321 322 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 323 324 if (tb[IPSET_ATTR_PROTO]) { 325 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 326 with_ports = ip_set_proto_with_ports(e.proto); 327 328 if (e.proto == 0) 329 return -IPSET_ERR_INVALID_PROTO; 330 } else { 331 return -IPSET_ERR_MISSING_PROTO; 332 } 333 334 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 335 e.port = 0; 336 337 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 338 ret = adtfn(set, &e, &ext, &ext, flags); 339 return ip_set_eexist(ret, flags) ? 0 : ret; 340 } 341 342 port = ntohs(e.port); 343 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 344 if (port > port_to) 345 swap(port, port_to); 346 347 if (retried) 348 port = ntohs(h->next.port); 349 for (; port <= port_to; port++) { 350 e.port = htons(port); 351 ret = adtfn(set, &e, &ext, &ext, flags); 352 353 if (ret && !ip_set_eexist(ret, flags)) 354 return ret; 355 356 ret = 0; 357 } 358 return ret; 359 } 360 361 static struct ip_set_type hash_ipport_type __read_mostly = { 362 .name = "hash:ip,port", 363 .protocol = IPSET_PROTOCOL, 364 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT, 365 .dimension = IPSET_DIM_TWO, 366 .family = NFPROTO_UNSPEC, 367 .revision_min = IPSET_TYPE_REV_MIN, 368 .revision_max = IPSET_TYPE_REV_MAX, 369 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 370 .create = hash_ipport_create, 371 .create_policy = { 372 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 373 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 374 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 375 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 376 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 377 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 378 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 379 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 380 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 }, 381 [IPSET_ATTR_BITMASK] = { .type = NLA_NESTED }, 382 }, 383 .adt_policy = { 384 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 385 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 386 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 387 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 388 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 389 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 390 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 391 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 392 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 393 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 394 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 395 .len = IPSET_MAX_COMMENT_SIZE }, 396 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 397 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 398 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 399 }, 400 .me = THIS_MODULE, 401 }; 402 403 static int __init 404 hash_ipport_init(void) 405 { 406 return ip_set_type_register(&hash_ipport_type); 407 } 408 409 static void __exit 410 hash_ipport_fini(void) 411 { 412 rcu_barrier(); 413 ip_set_type_unregister(&hash_ipport_type); 414 } 415 416 module_init(hash_ipport_init); 417 module_exit(hash_ipport_fini); 418