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 #define IPSET_TYPE_REV_MAX 5 /* skbinfo support added */ 29 30 MODULE_LICENSE("GPL"); 31 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 32 IP_SET_MODULE_DESC("hash:ip,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 33 MODULE_ALIAS("ip_set_hash:ip,port"); 34 35 /* Type specific function prefix */ 36 #define HTYPE hash_ipport 37 38 /* IPv4 variant */ 39 40 /* Member elements */ 41 struct hash_ipport4_elem { 42 __be32 ip; 43 __be16 port; 44 u8 proto; 45 u8 padding; 46 }; 47 48 /* Common functions */ 49 50 static bool 51 hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1, 52 const struct hash_ipport4_elem *ip2, 53 u32 *multi) 54 { 55 return ip1->ip == ip2->ip && 56 ip1->port == ip2->port && 57 ip1->proto == ip2->proto; 58 } 59 60 static bool 61 hash_ipport4_data_list(struct sk_buff *skb, 62 const struct hash_ipport4_elem *data) 63 { 64 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || 65 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 66 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto)) 67 goto nla_put_failure; 68 return false; 69 70 nla_put_failure: 71 return true; 72 } 73 74 static void 75 hash_ipport4_data_next(struct hash_ipport4_elem *next, 76 const struct hash_ipport4_elem *d) 77 { 78 next->ip = d->ip; 79 next->port = d->port; 80 } 81 82 #define MTYPE hash_ipport4 83 #define HOST_MASK 32 84 #include "ip_set_hash_gen.h" 85 86 static int 87 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb, 88 const struct xt_action_param *par, 89 enum ipset_adt adt, struct ip_set_adt_opt *opt) 90 { 91 ipset_adtfn adtfn = set->variant->adt[adt]; 92 struct hash_ipport4_elem e = { .ip = 0 }; 93 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 94 95 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 96 &e.port, &e.proto)) 97 return -EINVAL; 98 99 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 100 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 101 } 102 103 static int 104 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[], 105 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 106 { 107 const struct hash_ipport4 *h = set->data; 108 ipset_adtfn adtfn = set->variant->adt[adt]; 109 struct hash_ipport4_elem e = { .ip = 0 }; 110 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 111 u32 ip, ip_to = 0, p = 0, port, port_to; 112 bool with_ports = false; 113 int ret; 114 115 if (tb[IPSET_ATTR_LINENO]) 116 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 117 118 if (unlikely(!tb[IPSET_ATTR_IP] || 119 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 120 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) 121 return -IPSET_ERR_PROTOCOL; 122 123 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip); 124 if (ret) 125 return ret; 126 127 ret = ip_set_get_extensions(set, tb, &ext); 128 if (ret) 129 return ret; 130 131 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 132 133 if (tb[IPSET_ATTR_PROTO]) { 134 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 135 with_ports = ip_set_proto_with_ports(e.proto); 136 137 if (e.proto == 0) 138 return -IPSET_ERR_INVALID_PROTO; 139 } else { 140 return -IPSET_ERR_MISSING_PROTO; 141 } 142 143 if (!(with_ports || e.proto == IPPROTO_ICMP)) 144 e.port = 0; 145 146 if (adt == IPSET_TEST || 147 !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] || 148 tb[IPSET_ATTR_PORT_TO])) { 149 ret = adtfn(set, &e, &ext, &ext, flags); 150 return ip_set_eexist(ret, flags) ? 0 : ret; 151 } 152 153 ip_to = ip = ntohl(e.ip); 154 if (tb[IPSET_ATTR_IP_TO]) { 155 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 156 if (ret) 157 return ret; 158 if (ip > ip_to) 159 swap(ip, ip_to); 160 } else if (tb[IPSET_ATTR_CIDR]) { 161 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 162 163 if (!cidr || cidr > HOST_MASK) 164 return -IPSET_ERR_INVALID_CIDR; 165 ip_set_mask_from_to(ip, ip_to, cidr); 166 } 167 168 port_to = port = ntohs(e.port); 169 if (with_ports && tb[IPSET_ATTR_PORT_TO]) { 170 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 171 if (port > port_to) 172 swap(port, port_to); 173 } 174 175 if (retried) 176 ip = ntohl(h->next.ip); 177 for (; ip <= ip_to; ip++) { 178 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port) 179 : port; 180 for (; p <= port_to; p++) { 181 e.ip = htonl(ip); 182 e.port = htons(p); 183 ret = adtfn(set, &e, &ext, &ext, flags); 184 185 if (ret && !ip_set_eexist(ret, flags)) 186 return ret; 187 188 ret = 0; 189 } 190 } 191 return ret; 192 } 193 194 /* IPv6 variant */ 195 196 struct hash_ipport6_elem { 197 union nf_inet_addr ip; 198 __be16 port; 199 u8 proto; 200 u8 padding; 201 }; 202 203 /* Common functions */ 204 205 static bool 206 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1, 207 const struct hash_ipport6_elem *ip2, 208 u32 *multi) 209 { 210 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && 211 ip1->port == ip2->port && 212 ip1->proto == ip2->proto; 213 } 214 215 static bool 216 hash_ipport6_data_list(struct sk_buff *skb, 217 const struct hash_ipport6_elem *data) 218 { 219 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || 220 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) || 221 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto)) 222 goto nla_put_failure; 223 return false; 224 225 nla_put_failure: 226 return true; 227 } 228 229 static void 230 hash_ipport6_data_next(struct hash_ipport6_elem *next, 231 const struct hash_ipport6_elem *d) 232 { 233 next->port = d->port; 234 } 235 236 #undef MTYPE 237 #undef HOST_MASK 238 239 #define MTYPE hash_ipport6 240 #define HOST_MASK 128 241 #define IP_SET_EMIT_CREATE 242 #include "ip_set_hash_gen.h" 243 244 static int 245 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb, 246 const struct xt_action_param *par, 247 enum ipset_adt adt, struct ip_set_adt_opt *opt) 248 { 249 ipset_adtfn adtfn = set->variant->adt[adt]; 250 struct hash_ipport6_elem e = { .ip = { .all = { 0 } } }; 251 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 252 253 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC, 254 &e.port, &e.proto)) 255 return -EINVAL; 256 257 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 258 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 259 } 260 261 static int 262 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[], 263 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 264 { 265 const struct hash_ipport6 *h = set->data; 266 ipset_adtfn adtfn = set->variant->adt[adt]; 267 struct hash_ipport6_elem e = { .ip = { .all = { 0 } } }; 268 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 269 u32 port, port_to; 270 bool with_ports = false; 271 int ret; 272 273 if (tb[IPSET_ATTR_LINENO]) 274 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 275 276 if (unlikely(!tb[IPSET_ATTR_IP] || 277 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || 278 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) 279 return -IPSET_ERR_PROTOCOL; 280 if (unlikely(tb[IPSET_ATTR_IP_TO])) 281 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 282 if (unlikely(tb[IPSET_ATTR_CIDR])) { 283 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 284 285 if (cidr != HOST_MASK) 286 return -IPSET_ERR_INVALID_CIDR; 287 } 288 289 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 290 if (ret) 291 return ret; 292 293 ret = ip_set_get_extensions(set, tb, &ext); 294 if (ret) 295 return ret; 296 297 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]); 298 299 if (tb[IPSET_ATTR_PROTO]) { 300 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]); 301 with_ports = ip_set_proto_with_ports(e.proto); 302 303 if (e.proto == 0) 304 return -IPSET_ERR_INVALID_PROTO; 305 } else { 306 return -IPSET_ERR_MISSING_PROTO; 307 } 308 309 if (!(with_ports || e.proto == IPPROTO_ICMPV6)) 310 e.port = 0; 311 312 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) { 313 ret = adtfn(set, &e, &ext, &ext, flags); 314 return ip_set_eexist(ret, flags) ? 0 : ret; 315 } 316 317 port = ntohs(e.port); 318 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); 319 if (port > port_to) 320 swap(port, port_to); 321 322 if (retried) 323 port = ntohs(h->next.port); 324 for (; port <= port_to; port++) { 325 e.port = htons(port); 326 ret = adtfn(set, &e, &ext, &ext, flags); 327 328 if (ret && !ip_set_eexist(ret, flags)) 329 return ret; 330 331 ret = 0; 332 } 333 return ret; 334 } 335 336 static struct ip_set_type hash_ipport_type __read_mostly = { 337 .name = "hash:ip,port", 338 .protocol = IPSET_PROTOCOL, 339 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT, 340 .dimension = IPSET_DIM_TWO, 341 .family = NFPROTO_UNSPEC, 342 .revision_min = IPSET_TYPE_REV_MIN, 343 .revision_max = IPSET_TYPE_REV_MAX, 344 .create = hash_ipport_create, 345 .create_policy = { 346 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 347 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 348 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 349 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 350 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 351 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 352 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 353 }, 354 .adt_policy = { 355 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 356 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 357 [IPSET_ATTR_PORT] = { .type = NLA_U16 }, 358 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, 359 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 360 [IPSET_ATTR_PROTO] = { .type = NLA_U8 }, 361 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 362 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 363 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 364 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 365 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 366 .len = IPSET_MAX_COMMENT_SIZE }, 367 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 368 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 369 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 370 }, 371 .me = THIS_MODULE, 372 }; 373 374 static int __init 375 hash_ipport_init(void) 376 { 377 return ip_set_type_register(&hash_ipport_type); 378 } 379 380 static void __exit 381 hash_ipport_fini(void) 382 { 383 rcu_barrier(); 384 ip_set_type_unregister(&hash_ipport_type); 385 } 386 387 module_init(hash_ipport_init); 388 module_exit(hash_ipport_fini); 389