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 (((u64)ip_to - ip + 1)*(port_to - port + 1) > IPSET_MAX_RANGE) 177 return -ERANGE; 178 179 if (retried) 180 ip = ntohl(h->next.ip); 181 for (; ip <= ip_to; ip++) { 182 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port) 183 : port; 184 for (; p <= port_to; p++) { 185 e.ip = htonl(ip); 186 e.port = htons(p); 187 ret = adtfn(set, &e, &ext, &ext, flags); 188 189 if (ret && !ip_set_eexist(ret, flags)) 190 return ret; 191 192 ret = 0; 193 } 194 } 195 return ret; 196 } 197 198 /* IPv6 variant */ 199 200 struct hash_ipport6_elem { 201 union nf_inet_addr ip; 202 __be16 port; 203 u8 proto; 204 u8 padding; 205 }; 206 207 /* Common functions */ 208 209 static bool 210 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1, 211 const struct hash_ipport6_elem *ip2, 212 u32 *multi) 213 { 214 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 215 ip1->port == ip2->port && 216 ip1->proto == ip2->proto; 217 } 218 219 static bool 220 hash_ipport6_data_list(struct sk_buff *skb, 221 const struct hash_ipport6_elem *data) 222 { 223 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 224 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 225 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto)) 226 goto nla_put_failure; 227 return false; 228 229 nla_put_failure: 230 return true; 231 } 232 233 static void 234 hash_ipport6_data_next(struct hash_ipport6_elem *next, 235 const struct hash_ipport6_elem *d) 236 { 237 next->port = d->port; 238 } 239 240 #undef MTYPE 241 #undef HOST_MASK 242 243 #define MTYPE hash_ipport6 244 #define HOST_MASK 128 245 #define IP_SET_EMIT_CREATE 246 #include "ip_set_hash_gen.h" 247 248 static int 249 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb, 250 const struct xt_action_param *par, 251 enum ipset_adt adt, struct ip_set_adt_opt *opt) 252 { 253 ipset_adtfn adtfn = set->variant->adt[adt]; 254 struct hash_ipport6_elem e = { .ip = { .all = { 0 } } }; 255 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 256 257 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 258 &e.port, &e.proto)) 259 return -EINVAL; 260 261 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 262 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 263 } 264 265 static int 266 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[], 267 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 268 { 269 const struct hash_ipport6 *h = set->data; 270 ipset_adtfn adtfn = set->variant->adt[adt]; 271 struct hash_ipport6_elem e = { .ip = { .all = { 0 } } }; 272 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 273 u32 port, port_to; 274 bool with_ports = false; 275 int ret; 276 277 if (tb[IPSET_ATTR_LINENO]) 278 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 279 280 if (unlikely(!tb[IPSET_ATTR_IP] || 281 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 282 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) 283 return -IPSET_ERR_PROTOCOL; 284 if (unlikely(tb[IPSET_ATTR_IP_TO])) 285 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 286 if (unlikely(tb[IPSET_ATTR_CIDR])) { 287 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 288 289 if (cidr != HOST_MASK) 290 return -IPSET_ERR_INVALID_CIDR; 291 } 292 293 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 294 if (ret) 295 return ret; 296 297 ret = ip_set_get_extensions(set, tb, &ext); 298 if (ret) 299 return ret; 300 301 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 302 303 if (tb[IPSET_ATTR_PROTO]) { 304 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 305 with_ports = ip_set_proto_with_ports(e.proto); 306 307 if (e.proto == 0) 308 return -IPSET_ERR_INVALID_PROTO; 309 } else { 310 return -IPSET_ERR_MISSING_PROTO; 311 } 312 313 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 314 e.port = 0; 315 316 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 317 ret = adtfn(set, &e, &ext, &ext, flags); 318 return ip_set_eexist(ret, flags) ? 0 : ret; 319 } 320 321 port = ntohs(e.port); 322 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 323 if (port > port_to) 324 swap(port, port_to); 325 326 if (retried) 327 port = ntohs(h->next.port); 328 for (; port <= port_to; port++) { 329 e.port = htons(port); 330 ret = adtfn(set, &e, &ext, &ext, flags); 331 332 if (ret && !ip_set_eexist(ret, flags)) 333 return ret; 334 335 ret = 0; 336 } 337 return ret; 338 } 339 340 static struct ip_set_type hash_ipport_type __read_mostly = { 341 .name = "hash:ip,port", 342 .protocol = IPSET_PROTOCOL, 343 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT, 344 .dimension = IPSET_DIM_TWO, 345 .family = NFPROTO_UNSPEC, 346 .revision_min = IPSET_TYPE_REV_MIN, 347 .revision_max = IPSET_TYPE_REV_MAX, 348 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 349 .create = hash_ipport_create, 350 .create_policy = { 351 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 352 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 353 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 354 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 355 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 356 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 357 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 358 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 359 }, 360 .adt_policy = { 361 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 362 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 363 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 364 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 365 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 366 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 367 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 368 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 369 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 370 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 371 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 372 .len = IPSET_MAX_COMMENT_SIZE }, 373 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 374 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 375 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 376 }, 377 .me = THIS_MODULE, 378 }; 379 380 static int __init 381 hash_ipport_init(void) 382 { 383 return ip_set_type_register(&hash_ipport_type); 384 } 385 386 static void __exit 387 hash_ipport_fini(void) 388 { 389 rcu_barrier(); 390 ip_set_type_unregister(&hash_ipport_type); 391 } 392 393 module_init(hash_ipport_init); 394 module_exit(hash_ipport_fini); 395