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 /* 5 bucketsize, initval support */ 28 #define IPSET_TYPE_REV_MAX 6 /* bitmask support */ 29 30 MODULE_LICENSE("GPL"); 31 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 32 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 33 MODULE_ALIAS("ip_set_hash:ip"); 34 35 /* Type specific function prefix */ 36 #define HTYPE hash_ip 37 #define IP_SET_HASH_WITH_NETMASK 38 #define IP_SET_HASH_WITH_BITMASK 39 40 /* IPv4 variant */ 41 42 /* Member elements */ 43 struct hash_ip4_elem { 44 /* Zero valued IP addresses cannot be stored */ 45 __be32 ip; 46 }; 47 48 /* Common functions */ 49 50 static bool 51 hash_ip4_data_equal(const struct hash_ip4_elem *e1, 52 const struct hash_ip4_elem *e2, 53 u32 *multi) 54 { 55 return e1->ip == e2->ip; 56 } 57 58 static bool 59 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e) 60 { 61 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip)) 62 goto nla_put_failure; 63 return false; 64 65 nla_put_failure: 66 return true; 67 } 68 69 static void 70 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e) 71 { 72 next->ip = e->ip; 73 } 74 75 #define MTYPE hash_ip4 76 #define HOST_MASK 32 77 #include "ip_set_hash_gen.h" 78 79 static int 80 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb, 81 const struct xt_action_param *par, 82 enum ipset_adt adt, struct ip_set_adt_opt *opt) 83 { 84 const struct hash_ip4 *h = set->data; 85 ipset_adtfn adtfn = set->variant->adt[adt]; 86 struct hash_ip4_elem e = { 0 }; 87 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 88 __be32 ip; 89 90 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip); 91 ip &= h->bitmask.ip; 92 if (ip == 0) 93 return -EINVAL; 94 95 e.ip = ip; 96 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 97 } 98 99 static int 100 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[], 101 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 102 { 103 struct hash_ip4 *h = set->data; 104 ipset_adtfn adtfn = set->variant->adt[adt]; 105 struct hash_ip4_elem e = { 0 }; 106 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 107 u32 ip = 0, ip_to = 0, hosts, i = 0; 108 int ret = 0; 109 110 if (tb[IPSET_ATTR_LINENO]) 111 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 112 113 if (unlikely(!tb[IPSET_ATTR_IP])) 114 return -IPSET_ERR_PROTOCOL; 115 116 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 117 if (ret) 118 return ret; 119 120 ret = ip_set_get_extensions(set, tb, &ext); 121 if (ret) 122 return ret; 123 124 ip &= ntohl(h->bitmask.ip); 125 e.ip = htonl(ip); 126 if (e.ip == 0) 127 return -IPSET_ERR_HASH_ELEM; 128 129 if (adt == IPSET_TEST) 130 return adtfn(set, &e, &ext, &ext, flags); 131 132 ip_to = ip; 133 if (tb[IPSET_ATTR_IP_TO]) { 134 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 135 if (ret) 136 return ret; 137 if (ip > ip_to) { 138 if (ip_to == 0) 139 return -IPSET_ERR_HASH_ELEM; 140 swap(ip, ip_to); 141 } 142 } else if (tb[IPSET_ATTR_CIDR]) { 143 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 144 145 if (!cidr || cidr > HOST_MASK) 146 return -IPSET_ERR_INVALID_CIDR; 147 ip_set_mask_from_to(ip, ip_to, cidr); 148 } 149 150 hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1); 151 152 if (retried) 153 ip = ntohl(h->next.ip); 154 for (; ip <= ip_to; i++) { 155 e.ip = htonl(ip); 156 if (i > IPSET_MAX_RANGE) { 157 hash_ip4_data_next(&h->next, &e); 158 return -ERANGE; 159 } 160 ret = adtfn(set, &e, &ext, &ext, flags); 161 if (ret && !ip_set_eexist(ret, flags)) 162 return ret; 163 164 ip += hosts; 165 if (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 bool 191 hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e) 192 { 193 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6)) 194 goto nla_put_failure; 195 return false; 196 197 nla_put_failure: 198 return true; 199 } 200 201 static void 202 hash_ip6_data_next(struct hash_ip6_elem *next, const struct hash_ip6_elem *e) 203 { 204 } 205 206 #undef MTYPE 207 #undef HOST_MASK 208 209 #define MTYPE hash_ip6 210 #define HOST_MASK 128 211 212 #define IP_SET_EMIT_CREATE 213 #include "ip_set_hash_gen.h" 214 215 static int 216 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb, 217 const struct xt_action_param *par, 218 enum ipset_adt adt, struct ip_set_adt_opt *opt) 219 { 220 const struct hash_ip6 *h = set->data; 221 ipset_adtfn adtfn = set->variant->adt[adt]; 222 struct hash_ip6_elem e = { { .all = { 0 } } }; 223 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 224 225 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 226 nf_inet_addr_mask_inplace(&e.ip, &h->bitmask); 227 if (ipv6_addr_any(&e.ip.in6)) 228 return -EINVAL; 229 230 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 231 } 232 233 static int 234 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[], 235 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 236 { 237 const struct hash_ip6 *h = set->data; 238 ipset_adtfn adtfn = set->variant->adt[adt]; 239 struct hash_ip6_elem e = { { .all = { 0 } } }; 240 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 241 int ret; 242 243 if (tb[IPSET_ATTR_LINENO]) 244 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 245 246 if (unlikely(!tb[IPSET_ATTR_IP])) 247 return -IPSET_ERR_PROTOCOL; 248 if (unlikely(tb[IPSET_ATTR_IP_TO])) 249 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; 250 if (unlikely(tb[IPSET_ATTR_CIDR])) { 251 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 252 253 if (cidr != HOST_MASK) 254 return -IPSET_ERR_INVALID_CIDR; 255 } 256 257 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); 258 if (ret) 259 return ret; 260 261 ret = ip_set_get_extensions(set, tb, &ext); 262 if (ret) 263 return ret; 264 265 nf_inet_addr_mask_inplace(&e.ip, &h->bitmask); 266 if (ipv6_addr_any(&e.ip.in6)) 267 return -IPSET_ERR_HASH_ELEM; 268 269 ret = adtfn(set, &e, &ext, &ext, flags); 270 271 return ip_set_eexist(ret, flags) ? 0 : ret; 272 } 273 274 static struct ip_set_type hash_ip_type __read_mostly = { 275 .name = "hash:ip", 276 .protocol = IPSET_PROTOCOL, 277 .features = IPSET_TYPE_IP, 278 .dimension = IPSET_DIM_ONE, 279 .family = NFPROTO_UNSPEC, 280 .revision_min = IPSET_TYPE_REV_MIN, 281 .revision_max = IPSET_TYPE_REV_MAX, 282 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, 283 .create = hash_ip_create, 284 .create_policy = { 285 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 286 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 287 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, 288 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, 289 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 290 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 291 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 }, 292 [IPSET_ATTR_BITMASK] = { .type = NLA_NESTED }, 293 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 294 }, 295 .adt_policy = { 296 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 297 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 298 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 299 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 300 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 301 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 302 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 303 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 304 .len = IPSET_MAX_COMMENT_SIZE }, 305 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 306 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 307 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 308 }, 309 .me = THIS_MODULE, 310 }; 311 312 static int __init 313 hash_ip_init(void) 314 { 315 return ip_set_type_register(&hash_ip_type); 316 } 317 318 static void __exit 319 hash_ip_fini(void) 320 { 321 rcu_barrier(); 322 ip_set_type_unregister(&hash_ip_type); 323 } 324 325 module_init(hash_ip_init); 326 module_exit(hash_ip_fini); 327