1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (C) 2014 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
5 /* Kernel module implementing an IP set type: the hash:mac type */
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>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/ipset/ip_set.h>
17 #include <linux/netfilter/ipset/ip_set_hash.h>
19 #define IPSET_TYPE_REV_MIN 0
20 #define IPSET_TYPE_REV_MAX 0
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");
27 /* Type specific function prefix */
28 #define HTYPE hash_mac
31 struct hash_mac4_elem {
32 /* Zero valued IP addresses cannot be stored */
34 unsigned char ether[ETH_ALEN];
39 /* Common functions */
42 hash_mac4_data_equal(const struct hash_mac4_elem *e1,
43 const struct hash_mac4_elem *e2,
46 return ether_addr_equal(e1->ether, e2->ether);
50 hash_mac4_data_list(struct sk_buff *skb, const struct hash_mac4_elem *e)
52 if (nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether))
61 hash_mac4_data_next(struct hash_mac4_elem *next,
62 const struct hash_mac4_elem *e)
66 #define MTYPE hash_mac4
68 #define IP_SET_EMIT_CREATE
69 #define IP_SET_PROTO_UNDEF
70 #include "ip_set_hash_gen.h"
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)
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);
81 if (skb_mac_header(skb) < skb->head ||
82 (skb_mac_header(skb) + ETH_HLEN) > skb->data)
85 if (opt->flags & IPSET_DIM_ONE_SRC)
86 ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
88 ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
90 if (is_zero_ether_addr(e.ether))
92 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
96 hash_mac4_uadt(struct ip_set *set, struct nlattr *tb[],
97 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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);
104 if (tb[IPSET_ATTR_LINENO])
105 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
107 if (unlikely(!tb[IPSET_ATTR_ETHER] ||
108 nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN))
109 return -IPSET_ERR_PROTOCOL;
111 ret = ip_set_get_extensions(set, tb, &ext);
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;
118 return adtfn(set, &e, &ext, &ext, flags);
121 static struct ip_set_type hash_mac_type __read_mostly = {
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,
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 },
139 [IPSET_ATTR_ETHER] = { .type = NLA_BINARY,
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 },
157 return ip_set_type_register(&hash_mac_type);
164 ip_set_type_unregister(&hash_mac_type);
167 module_init(hash_mac_init);
168 module_exit(hash_mac_fini);