1 /* Copyright (C) 2016 Tomasz Chilinski <tomasz.chilinski@chilan.com> 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,mac type */ 9 10 #include <linux/jhash.h> 11 #include <linux/module.h> 12 #include <linux/ip.h> 13 #include <linux/etherdevice.h> 14 #include <linux/skbuff.h> 15 #include <linux/errno.h> 16 #include <linux/random.h> 17 #include <linux/if_ether.h> 18 #include <net/ip.h> 19 #include <net/ipv6.h> 20 #include <net/netlink.h> 21 #include <net/tcp.h> 22 23 #include <linux/netfilter.h> 24 #include <linux/netfilter/ipset/pfxlen.h> 25 #include <linux/netfilter/ipset/ip_set.h> 26 #include <linux/netfilter/ipset/ip_set_hash.h> 27 28 #define IPSET_TYPE_REV_MIN 0 29 #define IPSET_TYPE_REV_MAX 0 30 31 MODULE_LICENSE("GPL"); 32 MODULE_AUTHOR("Tomasz Chilinski <tomasz.chilinski@chilan.com>"); 33 IP_SET_MODULE_DESC("hash:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 34 MODULE_ALIAS("ip_set_hash:ip,mac"); 35 36 /* Type specific function prefix */ 37 #define HTYPE hash_ipmac 38 39 /* Zero valued element is not supported */ 40 static const unsigned char invalid_ether[ETH_ALEN] = { 0 }; 41 42 /* IPv4 variant */ 43 44 /* Member elements */ 45 struct hash_ipmac4_elem { 46 /* Zero valued IP addresses cannot be stored */ 47 __be32 ip; 48 union { 49 unsigned char ether[ETH_ALEN]; 50 __be32 foo[2]; 51 }; 52 }; 53 54 /* Common functions */ 55 56 static inline bool 57 hash_ipmac4_data_equal(const struct hash_ipmac4_elem *e1, 58 const struct hash_ipmac4_elem *e2, 59 u32 *multi) 60 { 61 return e1->ip == e2->ip && ether_addr_equal(e1->ether, e2->ether); 62 } 63 64 static bool 65 hash_ipmac4_data_list(struct sk_buff *skb, const struct hash_ipmac4_elem *e) 66 { 67 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip) || 68 nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) 69 goto nla_put_failure; 70 return false; 71 72 nla_put_failure: 73 return true; 74 } 75 76 static inline void 77 hash_ipmac4_data_next(struct hash_ipmac4_elem *next, 78 const struct hash_ipmac4_elem *e) 79 { 80 next->ip = e->ip; 81 } 82 83 #define MTYPE hash_ipmac4 84 #define PF 4 85 #define HOST_MASK 32 86 #define HKEY_DATALEN sizeof(struct hash_ipmac4_elem) 87 #include "ip_set_hash_gen.h" 88 89 static int 90 hash_ipmac4_kadt(struct ip_set *set, const struct sk_buff *skb, 91 const struct xt_action_param *par, 92 enum ipset_adt adt, struct ip_set_adt_opt *opt) 93 { 94 ipset_adtfn adtfn = set->variant->adt[adt]; 95 struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } }; 96 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 97 98 /* MAC can be src only */ 99 if (!(opt->flags & IPSET_DIM_TWO_SRC)) 100 return 0; 101 102 if (skb_mac_header(skb) < skb->head || 103 (skb_mac_header(skb) + ETH_HLEN) > skb->data) 104 return -EINVAL; 105 106 memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN); 107 if (ether_addr_equal(e.ether, invalid_ether)) 108 return -EINVAL; 109 110 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 111 112 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 113 } 114 115 static int 116 hash_ipmac4_uadt(struct ip_set *set, struct nlattr *tb[], 117 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 118 { 119 ipset_adtfn adtfn = set->variant->adt[adt]; 120 struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } }; 121 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 122 int ret; 123 124 if (unlikely(!tb[IPSET_ATTR_IP] || 125 !tb[IPSET_ATTR_ETHER] || 126 nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN || 127 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || 128 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || 129 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || 130 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || 131 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || 132 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) 133 return -IPSET_ERR_PROTOCOL; 134 135 if (tb[IPSET_ATTR_LINENO]) 136 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 137 138 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) || 139 ip_set_get_extensions(set, tb, &ext); 140 if (ret) 141 return ret; 142 memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); 143 if (ether_addr_equal(e.ether, invalid_ether)) 144 return -IPSET_ERR_HASH_ELEM; 145 146 return adtfn(set, &e, &ext, &ext, flags); 147 } 148 149 /* IPv6 variant */ 150 151 /* Member elements */ 152 struct hash_ipmac6_elem { 153 /* Zero valued IP addresses cannot be stored */ 154 union nf_inet_addr ip; 155 union { 156 unsigned char ether[ETH_ALEN]; 157 __be32 foo[2]; 158 }; 159 }; 160 161 /* Common functions */ 162 163 static inline bool 164 hash_ipmac6_data_equal(const struct hash_ipmac6_elem *e1, 165 const struct hash_ipmac6_elem *e2, 166 u32 *multi) 167 { 168 return ipv6_addr_equal(&e1->ip.in6, &e2->ip.in6) && 169 ether_addr_equal(e1->ether, e2->ether); 170 } 171 172 static bool 173 hash_ipmac6_data_list(struct sk_buff *skb, const struct hash_ipmac6_elem *e) 174 { 175 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) || 176 nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) 177 goto nla_put_failure; 178 return false; 179 180 nla_put_failure: 181 return true; 182 } 183 184 static inline void 185 hash_ipmac6_data_next(struct hash_ipmac6_elem *next, 186 const struct hash_ipmac6_elem *e) 187 { 188 } 189 190 #undef MTYPE 191 #undef PF 192 #undef HOST_MASK 193 #undef HKEY_DATALEN 194 195 #define MTYPE hash_ipmac6 196 #define PF 6 197 #define HOST_MASK 128 198 #define HKEY_DATALEN sizeof(struct hash_ipmac6_elem) 199 #define IP_SET_EMIT_CREATE 200 #include "ip_set_hash_gen.h" 201 202 static int 203 hash_ipmac6_kadt(struct ip_set *set, const struct sk_buff *skb, 204 const struct xt_action_param *par, 205 enum ipset_adt adt, struct ip_set_adt_opt *opt) 206 { 207 ipset_adtfn adtfn = set->variant->adt[adt]; 208 struct hash_ipmac6_elem e = { 209 { .all = { 0 } }, 210 { .foo[0] = 0, .foo[1] = 0 } 211 }; 212 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 213 214 /* MAC can be src only */ 215 if (!(opt->flags & IPSET_DIM_TWO_SRC)) 216 return 0; 217 218 if (skb_mac_header(skb) < skb->head || 219 (skb_mac_header(skb) + ETH_HLEN) > skb->data) 220 return -EINVAL; 221 222 memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN); 223 if (ether_addr_equal(e.ether, invalid_ether)) 224 return -EINVAL; 225 226 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 227 228 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 229 } 230 231 static int 232 hash_ipmac6_uadt(struct ip_set *set, struct nlattr *tb[], 233 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 234 { 235 ipset_adtfn adtfn = set->variant->adt[adt]; 236 struct hash_ipmac6_elem e = { 237 { .all = { 0 } }, 238 { .foo[0] = 0, .foo[1] = 0 } 239 }; 240 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 241 int ret; 242 243 if (unlikely(!tb[IPSET_ATTR_IP] || 244 !tb[IPSET_ATTR_ETHER] || 245 nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN || 246 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || 247 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || 248 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || 249 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || 250 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || 251 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) 252 return -IPSET_ERR_PROTOCOL; 253 254 if (tb[IPSET_ATTR_LINENO]) 255 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 256 257 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) || 258 ip_set_get_extensions(set, tb, &ext); 259 if (ret) 260 return ret; 261 262 memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); 263 if (ether_addr_equal(e.ether, invalid_ether)) 264 return -IPSET_ERR_HASH_ELEM; 265 266 return adtfn(set, &e, &ext, &ext, flags); 267 } 268 269 static struct ip_set_type hash_ipmac_type __read_mostly = { 270 .name = "hash:ip,mac", 271 .protocol = IPSET_PROTOCOL, 272 .features = IPSET_TYPE_IP | IPSET_TYPE_MAC, 273 .dimension = IPSET_DIM_TWO, 274 .family = NFPROTO_UNSPEC, 275 .revision_min = IPSET_TYPE_REV_MIN, 276 .revision_max = IPSET_TYPE_REV_MAX, 277 .create = hash_ipmac_create, 278 .create_policy = { 279 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 280 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 281 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 282 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 283 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 284 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 285 }, 286 .adt_policy = { 287 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 288 [IPSET_ATTR_ETHER] = { .type = NLA_BINARY, 289 .len = ETH_ALEN }, 290 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 291 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 292 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 293 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 294 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING }, 295 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 296 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 297 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 298 }, 299 .me = THIS_MODULE, 300 }; 301 302 static int __init 303 hash_ipmac_init(void) 304 { 305 return ip_set_type_register(&hash_ipmac_type); 306 } 307 308 static void __exit 309 hash_ipmac_fini(void) 310 { 311 ip_set_type_unregister(&hash_ipmac_type); 312 } 313 314 module_init(hash_ipmac_init); 315 module_exit(hash_ipmac_fini); 316