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