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