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