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 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, i = 0; 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 (retried) 184 ip = ntohl(h->next.ip); 185 for (; ip <= ip_to; ip++) { 186 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port) 187 : port; 188 for (; p <= port_to; p++, i++) { 189 e.ip = htonl(ip); 190 e.port = htons(p); 191 if (i > IPSET_MAX_RANGE) { 192 hash_ipportip4_data_next(&h->next, &e); 193 return -ERANGE; 194 } 195 ret = adtfn(set, &e, &ext, &ext, flags); 196 197 if (ret && !ip_set_eexist(ret, flags)) 198 return ret; 199 200 ret = 0; 201 } 202 } 203 return ret; 204 } 205 206 /* IPv6 variant */ 207 208 struct hash_ipportip6_elem { 209 union nf_inet_addr ip; 210 union nf_inet_addr ip2; 211 __be16 port; 212 u8 proto; 213 u8 padding; 214 }; 215 216 /* Common functions */ 217 218 static bool 219 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1, 220 const struct hash_ipportip6_elem *ip2, 221 u32 *multi) 222 { 223 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 224 ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) && 225 ip1->port == ip2->port && 226 ip1->proto == ip2->proto; 227 } 228 229 static bool 230 hash_ipportip6_data_list(struct sk_buff *skb, 231 const struct hash_ipportip6_elem *data) 232 { 233 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 234 nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) || 235 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 236 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto)) 237 goto nla_put_failure; 238 return false; 239 240 nla_put_failure: 241 return true; 242 } 243 244 static void 245 hash_ipportip6_data_next(struct hash_ipportip6_elem *next, 246 const struct hash_ipportip6_elem *d) 247 { 248 next->port = d->port; 249 } 250 251 #undef MTYPE 252 #undef HOST_MASK 253 254 #define MTYPE hash_ipportip6 255 #define HOST_MASK 128 256 #define IP_SET_EMIT_CREATE 257 #include "ip_set_hash_gen.h" 258 259 static int 260 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb, 261 const struct xt_action_param *par, 262 enum ipset_adt adt, struct ip_set_adt_opt *opt) 263 { 264 ipset_adtfn adtfn = set->variant->adt[adt]; 265 struct hash_ipportip6_elem e = { .ip = { .all = { 0 } } }; 266 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 267 268 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 269 &e.port, &e.proto)) 270 return -EINVAL; 271 272 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 273 ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6); 274 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 275 } 276 277 static int 278 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[], 279 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 280 { 281 const struct hash_ipportip6 *h = set->data; 282 ipset_adtfn adtfn = set->variant->adt[adt]; 283 struct hash_ipportip6_elem e = { .ip = { .all = { 0 } } }; 284 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 285 u32 port, port_to; 286 bool with_ports = false; 287 int ret; 288 289 if (tb[IPSET_ATTR_LINENO]) 290 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 291 292 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] || 293 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 294 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) 295 return -IPSET_ERR_PROTOCOL; 296 if (unlikely(tb[IPSET_ATTR_IP_TO])) 297 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 298 if (unlikely(tb[IPSET_ATTR_CIDR])) { 299 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 300 301 if (cidr != HOST_MASK) 302 return -IPSET_ERR_INVALID_CIDR; 303 } 304 305 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 306 if (ret) 307 return ret; 308 309 ret = ip_set_get_extensions(set, tb, &ext); 310 if (ret) 311 return ret; 312 313 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2); 314 if (ret) 315 return ret; 316 317 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 318 319 if (tb[IPSET_ATTR_PROTO]) { 320 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 321 with_ports = ip_set_proto_with_ports(e.proto); 322 323 if (e.proto == 0) 324 return -IPSET_ERR_INVALID_PROTO; 325 } else { 326 return -IPSET_ERR_MISSING_PROTO; 327 } 328 329 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 330 e.port = 0; 331 332 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 333 ret = adtfn(set, &e, &ext, &ext, flags); 334 return ip_set_eexist(ret, flags) ? 0 : ret; 335 } 336 337 port = ntohs(e.port); 338 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 339 if (port > port_to) 340 swap(port, port_to); 341 342 if (retried) 343 port = ntohs(h->next.port); 344 for (; port <= port_to; port++) { 345 e.port = htons(port); 346 ret = adtfn(set, &e, &ext, &ext, flags); 347 348 if (ret && !ip_set_eexist(ret, flags)) 349 return ret; 350 351 ret = 0; 352 } 353 return ret; 354 } 355 356 static struct ip_set_type hash_ipportip_type __read_mostly = { 357 .name = "hash:ip,port,ip", 358 .protocol = IPSET_PROTOCOL, 359 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2, 360 .dimension = IPSET_DIM_THREE, 361 .family = NFPROTO_UNSPEC, 362 .revision_min = IPSET_TYPE_REV_MIN, 363 .revision_max = IPSET_TYPE_REV_MAX, 364 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 365 .create = hash_ipportip_create, 366 .create_policy = { 367 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 368 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 369 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 370 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 371 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 372 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 373 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 374 }, 375 .adt_policy = { 376 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 377 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 378 [IPSET_ATTR_IP2] = { .type = NLA_NESTED }, 379 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 380 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 381 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 382 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 383 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 384 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 385 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 386 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 387 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 388 .len = IPSET_MAX_COMMENT_SIZE }, 389 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 390 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 391 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 392 }, 393 .me = THIS_MODULE, 394 }; 395 396 static int __init 397 hash_ipportip_init(void) 398 { 399 return ip_set_type_register(&hash_ipportip_type); 400 } 401 402 static void __exit 403 hash_ipportip_fini(void) 404 { 405 rcu_barrier(); 406 ip_set_type_unregister(&hash_ipportip_type); 407 } 408 409 module_init(hash_ipportip_init); 410 module_exit(hash_ipportip_fini); 411