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 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_hash.h> 21 22 #define IPSET_TYPE_REV_MIN 0 23 /* 1 Counters support */ 24 /* 2 Comments support */ 25 /* 3 Forceadd support */ 26 /* 4 skbinfo support */ 27 #define IPSET_TYPE_REV_MAX 5 /* bucketsize, initval support */ 28 29 MODULE_LICENSE("GPL"); 30 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 31 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 32 MODULE_ALIAS("ip_set_hash:ip"); 33 34 /* Type specific function prefix */ 35 #define HTYPE hash_ip 36 #define IP_SET_HASH_WITH_NETMASK 37 38 /* IPv4 variant */ 39 40 /* Member elements */ 41 struct hash_ip4_elem { 42 /* Zero valued IP addresses cannot be stored */ 43 __be32 ip; 44 }; 45 46 /* Common functions */ 47 48 static bool 49 hash_ip4_data_equal(const struct hash_ip4_elem *e1, 50 const struct hash_ip4_elem *e2, 51 u32 *multi) 52 { 53 return e1->ip == e2->ip; 54 } 55 56 static bool 57 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e) 58 { 59 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip)) 60 goto nla_put_failure; 61 return false; 62 63 nla_put_failure: 64 return true; 65 } 66 67 static void 68 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e) 69 { 70 next->ip = e->ip; 71 } 72 73 #define MTYPE hash_ip4 74 #define HOST_MASK 32 75 #include "ip_set_hash_gen.h" 76 77 static int 78 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb, 79 const struct xt_action_param *par, 80 enum ipset_adt adt, struct ip_set_adt_opt *opt) 81 { 82 const struct hash_ip4 *h = set->data; 83 ipset_adtfn adtfn = set->variant->adt[adt]; 84 struct hash_ip4_elem e = { 0 }; 85 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 86 __be32 ip; 87 88 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip); 89 ip &= ip_set_netmask(h->netmask); 90 if (ip == 0) 91 return -EINVAL; 92 93 e.ip = ip; 94 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 95 } 96 97 static int 98 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[], 99 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 100 { 101 const struct hash_ip4 *h = set->data; 102 ipset_adtfn adtfn = set->variant->adt[adt]; 103 struct hash_ip4_elem e = { 0 }; 104 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 105 u32 ip = 0, ip_to = 0, hosts; 106 int ret = 0; 107 108 if (tb[IPSET_ATTR_LINENO]) 109 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 110 111 if (unlikely(!tb[IPSET_ATTR_IP])) 112 return -IPSET_ERR_PROTOCOL; 113 114 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 115 if (ret) 116 return ret; 117 118 ret = ip_set_get_extensions(set, tb, &ext); 119 if (ret) 120 return ret; 121 122 ip &= ip_set_hostmask(h->netmask); 123 e.ip = htonl(ip); 124 if (e.ip == 0) 125 return -IPSET_ERR_HASH_ELEM; 126 127 if (adt == IPSET_TEST) 128 return adtfn(set, &e, &ext, &ext, flags); 129 130 ip_to = ip; 131 if (tb[IPSET_ATTR_IP_TO]) { 132 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 133 if (ret) 134 return ret; 135 if (ip > ip_to) { 136 if (ip_to == 0) 137 return -IPSET_ERR_HASH_ELEM; 138 swap(ip, ip_to); 139 } 140 } else if (tb[IPSET_ATTR_CIDR]) { 141 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 142 143 if (!cidr || cidr > HOST_MASK) 144 return -IPSET_ERR_INVALID_CIDR; 145 ip_set_mask_from_to(ip, ip_to, cidr); 146 } 147 148 hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1); 149 150 /* 64bit division is not allowed on 32bit */ 151 if (((u64)ip_to - ip + 1) >> (32 - h->netmask) > IPSET_MAX_RANGE) 152 return -ERANGE; 153 154 if (retried) { 155 ip = ntohl(h->next.ip); 156 e.ip = htonl(ip); 157 } 158 for (; ip <= ip_to;) { 159 ret = adtfn(set, &e, &ext, &ext, flags); 160 if (ret && !ip_set_eexist(ret, flags)) 161 return ret; 162 163 ip += hosts; 164 e.ip = htonl(ip); 165 if (e.ip == 0) 166 return 0; 167 168 ret = 0; 169 } 170 return ret; 171 } 172 173 /* IPv6 variant */ 174 175 /* Member elements */ 176 struct hash_ip6_elem { 177 union nf_inet_addr ip; 178 }; 179 180 /* Common functions */ 181 182 static bool 183 hash_ip6_data_equal(const struct hash_ip6_elem *ip1, 184 const struct hash_ip6_elem *ip2, 185 u32 *multi) 186 { 187 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6); 188 } 189 190 static void 191 hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix) 192 { 193 ip6_netmask(ip, prefix); 194 } 195 196 static bool 197 hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e) 198 { 199 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6)) 200 goto nla_put_failure; 201 return false; 202 203 nla_put_failure: 204 return true; 205 } 206 207 static void 208 hash_ip6_data_next(struct hash_ip6_elem *next, const struct hash_ip6_elem *e) 209 { 210 } 211 212 #undef MTYPE 213 #undef HOST_MASK 214 215 #define MTYPE hash_ip6 216 #define HOST_MASK 128 217 218 #define IP_SET_EMIT_CREATE 219 #include "ip_set_hash_gen.h" 220 221 static int 222 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb, 223 const struct xt_action_param *par, 224 enum ipset_adt adt, struct ip_set_adt_opt *opt) 225 { 226 const struct hash_ip6 *h = set->data; 227 ipset_adtfn adtfn = set->variant->adt[adt]; 228 struct hash_ip6_elem e = { { .all = { 0 } } }; 229 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 230 231 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 232 hash_ip6_netmask(&e.ip, h->netmask); 233 if (ipv6_addr_any(&e.ip.in6)) 234 return -EINVAL; 235 236 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 237 } 238 239 static int 240 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[], 241 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 242 { 243 const struct hash_ip6 *h = set->data; 244 ipset_adtfn adtfn = set->variant->adt[adt]; 245 struct hash_ip6_elem e = { { .all = { 0 } } }; 246 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 247 int ret; 248 249 if (tb[IPSET_ATTR_LINENO]) 250 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 251 252 if (unlikely(!tb[IPSET_ATTR_IP])) 253 return -IPSET_ERR_PROTOCOL; 254 if (unlikely(tb[IPSET_ATTR_IP_TO])) 255 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 256 if (unlikely(tb[IPSET_ATTR_CIDR])) { 257 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 258 259 if (cidr != HOST_MASK) 260 return -IPSET_ERR_INVALID_CIDR; 261 } 262 263 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 264 if (ret) 265 return ret; 266 267 ret = ip_set_get_extensions(set, tb, &ext); 268 if (ret) 269 return ret; 270 271 hash_ip6_netmask(&e.ip, h->netmask); 272 if (ipv6_addr_any(&e.ip.in6)) 273 return -IPSET_ERR_HASH_ELEM; 274 275 ret = adtfn(set, &e, &ext, &ext, flags); 276 277 return ip_set_eexist(ret, flags) ? 0 : ret; 278 } 279 280 static struct ip_set_type hash_ip_type __read_mostly = { 281 .name = "hash:ip", 282 .protocol = IPSET_PROTOCOL, 283 .features = IPSET_TYPE_IP, 284 .dimension = IPSET_DIM_ONE, 285 .family = NFPROTO_UNSPEC, 286 .revision_min = IPSET_TYPE_REV_MIN, 287 .revision_max = IPSET_TYPE_REV_MAX, 288 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 289 .create = hash_ip_create, 290 .create_policy = { 291 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 292 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 293 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 294 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 295 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 296 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 297 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 }, 298 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 299 }, 300 .adt_policy = { 301 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 302 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 303 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 304 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 305 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 306 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 307 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 308 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 309 .len = IPSET_MAX_COMMENT_SIZE }, 310 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 311 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 312 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 313 }, 314 .me = THIS_MODULE, 315 }; 316 317 static int __init 318 hash_ip_init(void) 319 { 320 return ip_set_type_register(&hash_ip_type); 321 } 322 323 static void __exit 324 hash_ip_fini(void) 325 { 326 rcu_barrier(); 327 ip_set_type_unregister(&hash_ip_type); 328 } 329 330 module_init(hash_ip_init); 331 module_exit(hash_ip_fini); 332