1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (C) 2016 Tomasz Chilinski <tomasz.chilinski@chilan.com> 3 */ 4 5 /* Kernel module implementing an IP set type: the hash:ip,mac type */ 6 7 #include <linux/jhash.h> 8 #include <linux/module.h> 9 #include <linux/ip.h> 10 #include <linux/etherdevice.h> 11 #include <linux/skbuff.h> 12 #include <linux/errno.h> 13 #include <linux/random.h> 14 #include <linux/if_ether.h> 15 #include <net/ip.h> 16 #include <net/ipv6.h> 17 #include <net/netlink.h> 18 #include <net/tcp.h> 19 20 #include <linux/netfilter.h> 21 #include <linux/netfilter/ipset/pfxlen.h> 22 #include <linux/netfilter/ipset/ip_set.h> 23 #include <linux/netfilter/ipset/ip_set_hash.h> 24 25 #define IPSET_TYPE_REV_MIN 0 26 #define IPSET_TYPE_REV_MAX 0 27 28 MODULE_LICENSE("GPL"); 29 MODULE_AUTHOR("Tomasz Chilinski <tomasz.chilinski@chilan.com>"); 30 IP_SET_MODULE_DESC("hash:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 31 MODULE_ALIAS("ip_set_hash:ip,mac"); 32 33 /* Type specific function prefix */ 34 #define HTYPE hash_ipmac 35 36 /* IPv4 variant */ 37 38 /* Member elements */ 39 struct hash_ipmac4_elem { 40 /* Zero valued IP addresses cannot be stored */ 41 __be32 ip; 42 union { 43 unsigned char ether[ETH_ALEN]; 44 __be32 foo[2]; 45 }; 46 }; 47 48 /* Common functions */ 49 50 static inline bool 51 hash_ipmac4_data_equal(const struct hash_ipmac4_elem *e1, 52 const struct hash_ipmac4_elem *e2, 53 u32 *multi) 54 { 55 return e1->ip == e2->ip && ether_addr_equal(e1->ether, e2->ether); 56 } 57 58 static bool 59 hash_ipmac4_data_list(struct sk_buff *skb, const struct hash_ipmac4_elem *e) 60 { 61 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip) || 62 nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) 63 goto nla_put_failure; 64 return false; 65 66 nla_put_failure: 67 return true; 68 } 69 70 static inline void 71 hash_ipmac4_data_next(struct hash_ipmac4_elem *next, 72 const struct hash_ipmac4_elem *e) 73 { 74 next->ip = e->ip; 75 } 76 77 #define MTYPE hash_ipmac4 78 #define PF 4 79 #define HOST_MASK 32 80 #define HKEY_DATALEN sizeof(struct hash_ipmac4_elem) 81 #include "ip_set_hash_gen.h" 82 83 static int 84 hash_ipmac4_kadt(struct ip_set *set, const struct sk_buff *skb, 85 const struct xt_action_param *par, 86 enum ipset_adt adt, struct ip_set_adt_opt *opt) 87 { 88 ipset_adtfn adtfn = set->variant->adt[adt]; 89 struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } }; 90 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 91 92 /* MAC can be src only */ 93 if (!(opt->flags & IPSET_DIM_TWO_SRC)) 94 return 0; 95 96 if (skb_mac_header(skb) < skb->head || 97 (skb_mac_header(skb) + ETH_HLEN) > skb->data) 98 return -EINVAL; 99 100 if (opt->flags & IPSET_DIM_ONE_SRC) 101 ether_addr_copy(e.ether, eth_hdr(skb)->h_source); 102 else 103 ether_addr_copy(e.ether, eth_hdr(skb)->h_dest); 104 105 if (is_zero_ether_addr(e.ether)) 106 return -EINVAL; 107 108 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); 109 110 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 111 } 112 113 static int 114 hash_ipmac4_uadt(struct ip_set *set, struct nlattr *tb[], 115 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 116 { 117 ipset_adtfn adtfn = set->variant->adt[adt]; 118 struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } }; 119 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 120 int ret; 121 122 if (unlikely(!tb[IPSET_ATTR_IP] || 123 !tb[IPSET_ATTR_ETHER] || 124 nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN || 125 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || 126 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || 127 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || 128 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || 129 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || 130 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) 131 return -IPSET_ERR_PROTOCOL; 132 133 if (tb[IPSET_ATTR_LINENO]) 134 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 135 136 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) || 137 ip_set_get_extensions(set, tb, &ext); 138 if (ret) 139 return ret; 140 memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); 141 if (is_zero_ether_addr(e.ether)) 142 return -IPSET_ERR_HASH_ELEM; 143 144 return adtfn(set, &e, &ext, &ext, flags); 145 } 146 147 /* IPv6 variant */ 148 149 /* Member elements */ 150 struct hash_ipmac6_elem { 151 /* Zero valued IP addresses cannot be stored */ 152 union nf_inet_addr ip; 153 union { 154 unsigned char ether[ETH_ALEN]; 155 __be32 foo[2]; 156 }; 157 }; 158 159 /* Common functions */ 160 161 static inline bool 162 hash_ipmac6_data_equal(const struct hash_ipmac6_elem *e1, 163 const struct hash_ipmac6_elem *e2, 164 u32 *multi) 165 { 166 return ipv6_addr_equal(&e1->ip.in6, &e2->ip.in6) && 167 ether_addr_equal(e1->ether, e2->ether); 168 } 169 170 static bool 171 hash_ipmac6_data_list(struct sk_buff *skb, const struct hash_ipmac6_elem *e) 172 { 173 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) || 174 nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) 175 goto nla_put_failure; 176 return false; 177 178 nla_put_failure: 179 return true; 180 } 181 182 static inline void 183 hash_ipmac6_data_next(struct hash_ipmac6_elem *next, 184 const struct hash_ipmac6_elem *e) 185 { 186 } 187 188 #undef MTYPE 189 #undef PF 190 #undef HOST_MASK 191 #undef HKEY_DATALEN 192 193 #define MTYPE hash_ipmac6 194 #define PF 6 195 #define HOST_MASK 128 196 #define HKEY_DATALEN sizeof(struct hash_ipmac6_elem) 197 #define IP_SET_EMIT_CREATE 198 #include "ip_set_hash_gen.h" 199 200 static int 201 hash_ipmac6_kadt(struct ip_set *set, const struct sk_buff *skb, 202 const struct xt_action_param *par, 203 enum ipset_adt adt, struct ip_set_adt_opt *opt) 204 { 205 ipset_adtfn adtfn = set->variant->adt[adt]; 206 struct hash_ipmac6_elem e = { 207 { .all = { 0 } }, 208 { .foo[0] = 0, .foo[1] = 0 } 209 }; 210 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 211 212 if (skb_mac_header(skb) < skb->head || 213 (skb_mac_header(skb) + ETH_HLEN) > skb->data) 214 return -EINVAL; 215 216 if (opt->flags & IPSET_DIM_ONE_SRC) 217 ether_addr_copy(e.ether, eth_hdr(skb)->h_source); 218 else 219 ether_addr_copy(e.ether, eth_hdr(skb)->h_dest); 220 221 if (is_zero_ether_addr(e.ether)) 222 return -EINVAL; 223 224 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); 225 226 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 227 } 228 229 static int 230 hash_ipmac6_uadt(struct ip_set *set, struct nlattr *tb[], 231 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 232 { 233 ipset_adtfn adtfn = set->variant->adt[adt]; 234 struct hash_ipmac6_elem e = { 235 { .all = { 0 } }, 236 { .foo[0] = 0, .foo[1] = 0 } 237 }; 238 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 239 int ret; 240 241 if (unlikely(!tb[IPSET_ATTR_IP] || 242 !tb[IPSET_ATTR_ETHER] || 243 nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN || 244 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || 245 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || 246 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || 247 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || 248 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || 249 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) 250 return -IPSET_ERR_PROTOCOL; 251 252 if (tb[IPSET_ATTR_LINENO]) 253 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 254 255 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) || 256 ip_set_get_extensions(set, tb, &ext); 257 if (ret) 258 return ret; 259 260 memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); 261 if (is_zero_ether_addr(e.ether)) 262 return -IPSET_ERR_HASH_ELEM; 263 264 return adtfn(set, &e, &ext, &ext, flags); 265 } 266 267 static struct ip_set_type hash_ipmac_type __read_mostly = { 268 .name = "hash:ip,mac", 269 .protocol = IPSET_PROTOCOL, 270 .features = IPSET_TYPE_IP | IPSET_TYPE_MAC, 271 .dimension = IPSET_DIM_TWO, 272 .family = NFPROTO_UNSPEC, 273 .revision_min = IPSET_TYPE_REV_MIN, 274 .revision_max = IPSET_TYPE_REV_MAX, 275 .create = hash_ipmac_create, 276 .create_policy = { 277 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 278 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 279 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 280 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 281 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 282 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 283 }, 284 .adt_policy = { 285 [IPSET_ATTR_IP] = { .type = NLA_NESTED }, 286 [IPSET_ATTR_ETHER] = { .type = NLA_BINARY, 287 .len = ETH_ALEN }, 288 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 289 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 290 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 291 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 292 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING }, 293 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 294 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 295 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 296 }, 297 .me = THIS_MODULE, 298 }; 299 300 static int __init 301 hash_ipmac_init(void) 302 { 303 return ip_set_type_register(&hash_ipmac_type); 304 } 305 306 static void __exit 307 hash_ipmac_fini(void) 308 { 309 ip_set_type_unregister(&hash_ipmac_type); 310 } 311 312 module_init(hash_ipmac_init); 313 module_exit(hash_ipmac_fini); 314