1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> 2 * 3 * This program is free software; you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License version 2 as 5 * published by the Free Software Foundation. 6 */ 7 8 /* Kernel module implementing an IP set type: the hash:ip type */ 9 10 #include <linux/jhash.h> 11 #include <linux/module.h> 12 #include <linux/ip.h> 13 #include <linux/skbuff.h> 14 #include <linux/errno.h> 15 #include <linux/random.h> 16 #include <net/ip.h> 17 #include <net/ipv6.h> 18 #include <net/netlink.h> 19 #include <net/tcp.h> 20 21 #include <linux/netfilter.h> 22 #include <linux/netfilter/ipset/pfxlen.h> 23 #include <linux/netfilter/ipset/ip_set.h> 24 #include <linux/netfilter/ipset/ip_set_hash.h> 25 26 #define IPSET_TYPE_REV_MIN 0 27 /* 1 Counters support */ 28 /* 2 Comments support */ 29 /* 3 Forceadd support */ 30 #define IPSET_TYPE_REV_MAX 4 /* skbinfo support */ 31 32 MODULE_LICENSE("GPL"); 33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); 34 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 35 MODULE_ALIAS("ip_set_hash:ip"); 36 37 /* Type specific function prefix */ 38 #define HTYPE hash_ip 39 #define IP_SET_HASH_WITH_NETMASK 40 41 /* IPv4 variant */ 42 43 /* Member elements */ 44 struct hash_ip4_elem { 45 /* Zero valued IP addresses cannot be stored */ 46 __be32 ip; 47 }; 48 49 /* Common functions */ 50 51 static inline bool 52 hash_ip4_data_equal(const struct hash_ip4_elem *e1, 53 const struct hash_ip4_elem *e2, 54 u32 *multi) 55 { 56 return e1->ip == e2->ip; 57 } 58 59 static bool 60 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e) 61 { 62 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip)) 63 goto nla_put_failure; 64 return false; 65 66 nla_put_failure: 67 return true; 68 } 69 70 static inline void 71 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e) 72 { 73 next->ip = e->ip; 74 } 75 76 #define MTYPE hash_ip4 77 #define HOST_MASK 32 78 #include "ip_set_hash_gen.h" 79 80 static int 81 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb, 82 const struct xt_action_param *par, 83 enum ipset_adt adt, struct ip_set_adt_opt *opt) 84 { 85 const struct hash_ip *h = set->data; 86 ipset_adtfn adtfn = set->variant->adt[adt]; 87 struct hash_ip4_elem e = { 0 }; 88 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 89 __be32 ip; 90 91 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip); 92 ip &= ip_set_netmask(h->netmask); 93 if (ip == 0) 94 return -EINVAL; 95 96 e.ip = ip; 97 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 98 } 99 100 static int 101 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[], 102 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 103 { 104 const struct hash_ip *h = set->data; 105 ipset_adtfn adtfn = set->variant->adt[adt]; 106 struct hash_ip4_elem e = { 0 }; 107 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 108 u32 ip = 0, ip_to = 0, hosts; 109 int ret = 0; 110 111 if (tb[IPSET_ATTR_LINENO]) 112 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 113 114 if (unlikely(!tb[IPSET_ATTR_IP])) 115 return -IPSET_ERR_PROTOCOL; 116 117 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); 118 if (ret) 119 return ret; 120 121 ret = ip_set_get_extensions(set, tb, &ext); 122 if (ret) 123 return ret; 124 125 ip &= ip_set_hostmask(h->netmask); 126 127 if (adt == IPSET_TEST) { 128 e.ip = htonl(ip); 129 if (e.ip == 0) 130 return -IPSET_ERR_HASH_ELEM; 131 return adtfn(set, &e, &ext, &ext, flags); 132 } 133 134 ip_to = ip; 135 if (tb[IPSET_ATTR_IP_TO]) { 136 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); 137 if (ret) 138 return ret; 139 if (ip > ip_to) 140 swap(ip, ip_to); 141 } else if (tb[IPSET_ATTR_CIDR]) { 142 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); 143 144 if (!cidr || cidr > HOST_MASK) 145 return -IPSET_ERR_INVALID_CIDR; 146 ip_set_mask_from_to(ip, ip_to, cidr); 147 } 148 149 hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1); 150 151 if (retried) 152 ip = ntohl(h->next.ip); 153 for (; !before(ip_to, ip); ip += hosts) { 154 e.ip = htonl(ip); 155 if (e.ip == 0) 156 return -IPSET_ERR_HASH_ELEM; 157 ret = adtfn(set, &e, &ext, &ext, flags); 158 159 if (ret && !ip_set_eexist(ret, flags)) 160 return ret; 161 162 ret = 0; 163 } 164 return ret; 165 } 166 167 /* IPv6 variant */ 168 169 /* Member elements */ 170 struct hash_ip6_elem { 171 union nf_inet_addr ip; 172 }; 173 174 /* Common functions */ 175 176 static inline bool 177 hash_ip6_data_equal(const struct hash_ip6_elem *ip1, 178 const struct hash_ip6_elem *ip2, 179 u32 *multi) 180 { 181 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6); 182 } 183 184 static inline void 185 hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix) 186 { 187 ip6_netmask(ip, prefix); 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 inline void 202 hash_ip6_data_next(struct hash_ip4_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_ip *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 hash_ip6_netmask(&e.ip, h->netmask); 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_ip *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 hash_ip6_netmask(&e.ip, h->netmask); 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 = hash_ip_create, 283 .create_policy = { 284 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 285 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 286 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 287 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 288 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 289 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 }, 290 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 291 }, 292 .adt_policy = { 293 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 294 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, 295 [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, 296 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 297 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 298 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 299 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 300 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 301 .len = IPSET_MAX_COMMENT_SIZE }, 302 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 303 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 304 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 305 }, 306 .me = THIS_MODULE, 307 }; 308 309 static int __init 310 hash_ip_init(void) 311 { 312 return ip_set_type_register(&hash_ip_type); 313 } 314 315 static void __exit 316 hash_ip_fini(void) 317 { 318 rcu_barrier(); 319 ip_set_type_unregister(&hash_ip_type); 320 } 321 322 module_init(hash_ip_init); 323 module_exit(hash_ip_fini); 324