1/* Copyright (C) 2014 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:mac type */ 9 10#include <linux/jhash.h> 11#include <linux/module.h> 12#include <linux/etherdevice.h> 13#include <linux/skbuff.h> 14#include <linux/errno.h> 15#include <linux/if_ether.h> 16#include <net/netlink.h> 17 18#include <linux/netfilter.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#define IPSET_TYPE_REV_MAX 0 24 25MODULE_LICENSE("GPL"); 26MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); 27IP_SET_MODULE_DESC("hash:mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 28MODULE_ALIAS("ip_set_hash:mac"); 29 30/* Type specific function prefix */ 31#define HTYPE hash_mac 32 33/* Member elements */ 34struct hash_mac4_elem { 35 /* Zero valued IP addresses cannot be stored */ 36 union { 37 unsigned char ether[ETH_ALEN]; 38 __be32 foo[2]; 39 }; 40}; 41 42/* Common functions */ 43 44static inline bool 45hash_mac4_data_equal(const struct hash_mac4_elem *e1, 46 const struct hash_mac4_elem *e2, 47 u32 *multi) 48{ 49 return ether_addr_equal(e1->ether, e2->ether); 50} 51 52static inline bool 53hash_mac4_data_list(struct sk_buff *skb, const struct hash_mac4_elem *e) 54{ 55 return nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether); 56} 57 58static inline void 59hash_mac4_data_next(struct hash_mac4_elem *next, 60 const struct hash_mac4_elem *e) 61{ 62} 63 64#define MTYPE hash_mac4 65#define PF 4 66#define HOST_MASK 32 67#define IP_SET_EMIT_CREATE 68#define IP_SET_PROTO_UNDEF 69#include "ip_set_hash_gen.h" 70 71/* Zero valued element is not supported */ 72static const unsigned char invalid_ether[ETH_ALEN] = { 0 }; 73 74static int 75hash_mac4_kadt(struct ip_set *set, const struct sk_buff *skb, 76 const struct xt_action_param *par, 77 enum ipset_adt adt, struct ip_set_adt_opt *opt) 78{ 79 ipset_adtfn adtfn = set->variant->adt[adt]; 80 struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } }; 81 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 82 83 /* MAC can be src only */ 84 if (!(opt->flags & IPSET_DIM_ONE_SRC)) 85 return 0; 86 87 if (skb_mac_header(skb) < skb->head || 88 (skb_mac_header(skb) + ETH_HLEN) > skb->data) 89 return -EINVAL; 90 91 memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN); 92 if (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0) 93 return -EINVAL; 94 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 95} 96 97static int 98hash_mac4_uadt(struct ip_set *set, struct nlattr *tb[], 99 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 100{ 101 ipset_adtfn adtfn = set->variant->adt[adt]; 102 struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } }; 103 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 104 int ret; 105 106 if (unlikely(!tb[IPSET_ATTR_ETHER] || 107 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || 108 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || 109 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || 110 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || 111 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || 112 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) 113 return -IPSET_ERR_PROTOCOL; 114 115 if (tb[IPSET_ATTR_LINENO]) 116 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 117 118 ret = ip_set_get_extensions(set, tb, &ext); 119 if (ret) 120 return ret; 121 memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); 122 if (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0) 123 return -IPSET_ERR_HASH_ELEM; 124 125 return adtfn(set, &e, &ext, &ext, flags); 126} 127 128static struct ip_set_type hash_mac_type __read_mostly = { 129 .name = "hash:mac", 130 .protocol = IPSET_PROTOCOL, 131 .features = IPSET_TYPE_MAC, 132 .dimension = IPSET_DIM_ONE, 133 .family = NFPROTO_UNSPEC, 134 .revision_min = IPSET_TYPE_REV_MIN, 135 .revision_max = IPSET_TYPE_REV_MAX, 136 .create = hash_mac_create, 137 .create_policy = { 138 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 139 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 140 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 141 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 142 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 143 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 144 }, 145 .adt_policy = { 146 [IPSET_ATTR_ETHER] = { .type = NLA_BINARY, 147 .len = ETH_ALEN }, 148 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 149 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 150 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 151 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 152 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING }, 153 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 154 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 155 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 156 }, 157 .me = THIS_MODULE, 158}; 159 160static int __init 161hash_mac_init(void) 162{ 163 return ip_set_type_register(&hash_mac_type); 164} 165 166static void __exit 167hash_mac_fini(void) 168{ 169 ip_set_type_unregister(&hash_mac_type); 170} 171 172module_init(hash_mac_init); 173module_exit(hash_mac_fini); 174