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,ip 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 #define IPSET_TYPE_REV_MAX 6 /* bucketsize, initval support added */ 30 31 MODULE_LICENSE("GPL"); 32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 33 IP_SET_MODULE_DESC("hash:ip,port,ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 34 MODULE_ALIAS("ip_set_hash:ip,port,ip"); 35 36 /* Type specific function prefix */ 37 #define HTYPE hash_ipportip 38 39 /* IPv4 variant */ 40 41 /* Member elements */ 42 struct hash_ipportip4_elem { 43 __be32 ip; 44 __be32 ip2; 45 __be16 port; 46 u8 proto; 47 u8 padding; 48 }; 49 50 static bool 51 hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1, 52 const struct hash_ipportip4_elem *ip2, 53 u32 *multi) 54 { 55 return ip1->ip == ip2->ip && 56 ip1->ip2 == ip2->ip2 && 57 ip1->port == ip2->port && 58 ip1->proto == ip2->proto; 59 } 60 61 static bool 62 hash_ipportip4_data_list(struct sk_buff *skb, 63 const struct hash_ipportip4_elem *data) 64 { 65 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 66 nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) || 67 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 68 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto)) 69 goto nla_put_failure; 70 return false; 71 72 nla_put_failure: 73 return true; 74 } 75 76 static void 77 hash_ipportip4_data_next(struct hash_ipportip4_elem *next, 78 const struct hash_ipportip4_elem *d) 79 { 80 next->ip = d->ip; 81 next->port = d->port; 82 } 83 84 /* Common functions */ 85 #define MTYPE hash_ipportip4 86 #define HOST_MASK 32 87 #include "ip_set_hash_gen.h" 88 89 static int 90 hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb, 91 const struct xt_action_param *par, 92 enum ipset_adt adt, struct ip_set_adt_opt *opt) 93 { 94 ipset_adtfn adtfn = set->variant->adt[adt]; 95 struct hash_ipportip4_elem e = { .ip = 0 }; 96 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 97 98 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 99 &e.port, &e.proto)) 100 return -EINVAL; 101 102 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 103 ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2); 104 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 105 } 106 107 static int 108 hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[], 109 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 110 { 111 const struct hash_ipportip4 *h = set->data; 112 ipset_adtfn adtfn = set->variant->adt[adt]; 113 struct hash_ipportip4_elem e = { .ip = 0 }; 114 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 115 u32 ip, ip_to = 0, p = 0, port, port_to; 116 bool with_ports = false; 117 int ret; 118 119 if (tb[IPSET_ATTR_LINENO]) 120 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 121 122 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 123 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 124 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) 125 return -IPSET_ERR_PROTOCOL; 126 127 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip); 128 if (ret) 129 return ret; 130 131 ret = ip_set_get_extensions(set, tb, &ext); 132 if (ret) 133 return ret; 134 135 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP2], &e.ip2); 136 if (ret) 137 return ret; 138 139 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 140 141 if (tb[IPSET_ATTR_PROTO]) { 142 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 143 with_ports = ip_set_proto_with_ports(e.proto); 144 145 if (e.proto == 0) 146 return -IPSET_ERR_INVALID_PROTO; 147 } else { 148 return -IPSET_ERR_MISSING_PROTO; 149 } 150 151 if (!(with_ports || e.proto == IPPROTO_ICMP)) 152 e.port = 0; 153 154 if (adt == IPSET_TEST || 155 !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] || 156 tb[IPSET_ATTR_PORT_TO])) { 157 ret = adtfn(set, &e, &ext, &ext, flags); 158 return ip_set_eexist(ret, flags) ? 0 : ret; 159 } 160 161 ip_to = ip = ntohl(e.ip); 162 if (tb[IPSET_ATTR_IP_TO]) { 163 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 164 if (ret) 165 return ret; 166 if (ip > ip_to) 167 swap(ip, ip_to); 168 } else if (tb[IPSET_ATTR_CIDR]) { 169 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 170 171 if (!cidr || cidr > HOST_MASK) 172 return -IPSET_ERR_INVALID_CIDR; 173 ip_set_mask_from_to(ip, ip_to, cidr); 174 } 175 176 port_to = port = ntohs(e.port); 177 if (with_ports && tb[IPSET_ATTR_PORT_TO]) { 178 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 179 if (port > port_to) 180 swap(port, port_to); 181 } 182 183 if (((u64)ip_to - ip + 1)*(port_to - port + 1) > IPSET_MAX_RANGE) 184 return -ERANGE; 185 186 if (retried) 187 ip = ntohl(h->next.ip); 188 for (; ip <= ip_to; ip++) { 189 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port) 190 : port; 191 for (; p <= port_to; p++) { 192 e.ip = htonl(ip); 193 e.port = htons(p); 194 ret = adtfn(set, &e, &ext, &ext, flags); 195 196 if (ret && !ip_set_eexist(ret, flags)) 197 return ret; 198 199 ret = 0; 200 } 201 } 202 return ret; 203 } 204 205 /* IPv6 variant */ 206 207 struct hash_ipportip6_elem { 208 union nf_inet_addr ip; 209 union nf_inet_addr ip2; 210 __be16 port; 211 u8 proto; 212 u8 padding; 213 }; 214 215 /* Common functions */ 216 217 static bool 218 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1, 219 const struct hash_ipportip6_elem *ip2, 220 u32 *multi) 221 { 222 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 223 ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) && 224 ip1->port == ip2->port && 225 ip1->proto == ip2->proto; 226 } 227 228 static bool 229 hash_ipportip6_data_list(struct sk_buff *skb, 230 const struct hash_ipportip6_elem *data) 231 { 232 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 233 nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) || 234 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 235 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto)) 236 goto nla_put_failure; 237 return false; 238 239 nla_put_failure: 240 return true; 241 } 242 243 static void 244 hash_ipportip6_data_next(struct hash_ipportip6_elem *next, 245 const struct hash_ipportip6_elem *d) 246 { 247 next->port = d->port; 248 } 249 250 #undef MTYPE 251 #undef HOST_MASK 252 253 #define MTYPE hash_ipportip6 254 #define HOST_MASK 128 255 #define IP_SET_EMIT_CREATE 256 #include "ip_set_hash_gen.h" 257 258 static int 259 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb, 260 const struct xt_action_param *par, 261 enum ipset_adt adt, struct ip_set_adt_opt *opt) 262 { 263 ipset_adtfn adtfn = set->variant->adt[adt]; 264 struct hash_ipportip6_elem e = { .ip = { .all = { 0 } } }; 265 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 266 267 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 268 &e.port, &e.proto)) 269 return -EINVAL; 270 271 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 272 ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6); 273 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 274 } 275 276 static int 277 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[], 278 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 279 { 280 const struct hash_ipportip6 *h = set->data; 281 ipset_adtfn adtfn = set->variant->adt[adt]; 282 struct hash_ipportip6_elem e = { .ip = { .all = { 0 } } }; 283 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 284 u32 port, port_to; 285 bool with_ports = false; 286 int ret; 287 288 if (tb[IPSET_ATTR_LINENO]) 289 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 290 291 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 292 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 293 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) 294 return -IPSET_ERR_PROTOCOL; 295 if (unlikely(tb[IPSET_ATTR_IP_TO])) 296 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 297 if (unlikely(tb[IPSET_ATTR_CIDR])) { 298 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 299 300 if (cidr != HOST_MASK) 301 return -IPSET_ERR_INVALID_CIDR; 302 } 303 304 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 305 if (ret) 306 return ret; 307 308 ret = ip_set_get_extensions(set, tb, &ext); 309 if (ret) 310 return ret; 311 312 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2); 313 if (ret) 314 return ret; 315 316 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 317 318 if (tb[IPSET_ATTR_PROTO]) { 319 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 320 with_ports = ip_set_proto_with_ports(e.proto); 321 322 if (e.proto == 0) 323 return -IPSET_ERR_INVALID_PROTO; 324 } else { 325 return -IPSET_ERR_MISSING_PROTO; 326 } 327 328 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 329 e.port = 0; 330 331 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 332 ret = adtfn(set, &e, &ext, &ext, flags); 333 return ip_set_eexist(ret, flags) ? 0 : ret; 334 } 335 336 port = ntohs(e.port); 337 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 338 if (port > port_to) 339 swap(port, port_to); 340 341 if (retried) 342 port = ntohs(h->next.port); 343 for (; port <= port_to; port++) { 344 e.port = htons(port); 345 ret = adtfn(set, &e, &ext, &ext, flags); 346 347 if (ret && !ip_set_eexist(ret, flags)) 348 return ret; 349 350 ret = 0; 351 } 352 return ret; 353 } 354 355 static struct ip_set_type hash_ipportip_type __read_mostly = { 356 .name = "hash:ip,port,ip", 357 .protocol = IPSET_PROTOCOL, 358 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2, 359 .dimension = IPSET_DIM_THREE, 360 .family = NFPROTO_UNSPEC, 361 .revision_min = IPSET_TYPE_REV_MIN, 362 .revision_max = IPSET_TYPE_REV_MAX, 363 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 364 .create = hash_ipportip_create, 365 .create_policy = { 366 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 367 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 368 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 369 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 370 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 371 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 372 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 373 }, 374 .adt_policy = { 375 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 376 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 377 [IPSET_ATTR_IP2] = { .type = NLA_NESTED }, 378 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 379 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 380 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 381 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 382 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 383 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 384 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 385 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 386 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 387 .len = IPSET_MAX_COMMENT_SIZE }, 388 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 389 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 390 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 391 }, 392 .me = THIS_MODULE, 393 }; 394 395 static int __init 396 hash_ipportip_init(void) 397 { 398 return ip_set_type_register(&hash_ipportip_type); 399 } 400 401 static void __exit 402 hash_ipportip_fini(void) 403 { 404 rcu_barrier(); 405 ip_set_type_unregister(&hash_ipportip_type); 406 } 407 408 module_init(hash_ipportip_init); 409 module_exit(hash_ipportip_fini); 410