1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (C) 2014 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> 3 */ 4 5 /* Kernel module implementing an IP set type: the hash:mac type */ 6 7 #include <linux/jhash.h> 8 #include <linux/module.h> 9 #include <linux/etherdevice.h> 10 #include <linux/skbuff.h> 11 #include <linux/errno.h> 12 #include <linux/if_ether.h> 13 #include <net/netlink.h> 14 15 #include <linux/netfilter.h> 16 #include <linux/netfilter/ipset/ip_set.h> 17 #include <linux/netfilter/ipset/ip_set_hash.h> 18 19 #define IPSET_TYPE_REV_MIN 0 20 #define IPSET_TYPE_REV_MAX 0 21 22 MODULE_LICENSE("GPL"); 23 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); 24 IP_SET_MODULE_DESC("hash:mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); 25 MODULE_ALIAS("ip_set_hash:mac"); 26 27 /* Type specific function prefix */ 28 #define HTYPE hash_mac 29 30 /* Member elements */ 31 struct hash_mac4_elem { 32 /* Zero valued IP addresses cannot be stored */ 33 union { 34 unsigned char ether[ETH_ALEN]; 35 __be32 foo[2]; 36 }; 37 }; 38 39 /* Common functions */ 40 41 static inline bool 42 hash_mac4_data_equal(const struct hash_mac4_elem *e1, 43 const struct hash_mac4_elem *e2, 44 u32 *multi) 45 { 46 return ether_addr_equal(e1->ether, e2->ether); 47 } 48 49 static inline bool 50 hash_mac4_data_list(struct sk_buff *skb, const struct hash_mac4_elem *e) 51 { 52 if (nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) 53 goto nla_put_failure; 54 return false; 55 56 nla_put_failure: 57 return true; 58 } 59 60 static inline void 61 hash_mac4_data_next(struct hash_mac4_elem *next, 62 const struct hash_mac4_elem *e) 63 { 64 } 65 66 #define MTYPE hash_mac4 67 #define HOST_MASK 32 68 #define IP_SET_EMIT_CREATE 69 #define IP_SET_PROTO_UNDEF 70 #include "ip_set_hash_gen.h" 71 72 static int 73 hash_mac4_kadt(struct ip_set *set, const struct sk_buff *skb, 74 const struct xt_action_param *par, 75 enum ipset_adt adt, struct ip_set_adt_opt *opt) 76 { 77 ipset_adtfn adtfn = set->variant->adt[adt]; 78 struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } }; 79 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); 80 81 if (skb_mac_header(skb) < skb->head || 82 (skb_mac_header(skb) + ETH_HLEN) > skb->data) 83 return -EINVAL; 84 85 if (opt->flags & IPSET_DIM_ONE_SRC) 86 ether_addr_copy(e.ether, eth_hdr(skb)->h_source); 87 else 88 ether_addr_copy(e.ether, eth_hdr(skb)->h_dest); 89 90 if (is_zero_ether_addr(e.ether)) 91 return -EINVAL; 92 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); 93 } 94 95 static int 96 hash_mac4_uadt(struct ip_set *set, struct nlattr *tb[], 97 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) 98 { 99 ipset_adtfn adtfn = set->variant->adt[adt]; 100 struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } }; 101 struct ip_set_ext ext = IP_SET_INIT_UEXT(set); 102 int ret; 103 104 if (tb[IPSET_ATTR_LINENO]) 105 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); 106 107 if (unlikely(!tb[IPSET_ATTR_ETHER] || 108 nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN)) 109 return -IPSET_ERR_PROTOCOL; 110 111 ret = ip_set_get_extensions(set, tb, &ext); 112 if (ret) 113 return ret; 114 ether_addr_copy(e.ether, nla_data(tb[IPSET_ATTR_ETHER])); 115 if (is_zero_ether_addr(e.ether)) 116 return -IPSET_ERR_HASH_ELEM; 117 118 return adtfn(set, &e, &ext, &ext, flags); 119 } 120 121 static struct ip_set_type hash_mac_type __read_mostly = { 122 .name = "hash:mac", 123 .protocol = IPSET_PROTOCOL, 124 .features = IPSET_TYPE_MAC, 125 .dimension = IPSET_DIM_ONE, 126 .family = NFPROTO_UNSPEC, 127 .revision_min = IPSET_TYPE_REV_MIN, 128 .revision_max = IPSET_TYPE_REV_MAX, 129 .create = hash_mac_create, 130 .create_policy = { 131 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, 132 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, 133 [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, 134 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, 135 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 136 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, 137 }, 138 .adt_policy = { 139 [IPSET_ATTR_ETHER] = { .type = NLA_BINARY, 140 .len = ETH_ALEN }, 141 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, 142 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 143 [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, 144 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, 145 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, 146 .len = IPSET_MAX_COMMENT_SIZE }, 147 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, 148 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, 149 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, 150 }, 151 .me = THIS_MODULE, 152 }; 153 154 static int __init 155 hash_mac_init(void) 156 { 157 return ip_set_type_register(&hash_mac_type); 158 } 159 160 static void __exit 161 hash_mac_fini(void) 162 { 163 rcu_barrier(); 164 ip_set_type_unregister(&hash_mac_type); 165 } 166 167 module_init(hash_mac_init); 168 module_exit(hash_mac_fini); 169