1 /* Copyright (C) 2014 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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.
8 /* Kernel module implementing an IP set type: the hash:mac type */
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>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/ipset/ip_set.h>
20 #include <linux/netfilter/ipset/ip_set_hash.h>
22 #define IPSET_TYPE_REV_MIN 0
23 #define IPSET_TYPE_REV_MAX 0
25 MODULE_LICENSE("GPL");
26 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
27 IP_SET_MODULE_DESC("hash:mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
28 MODULE_ALIAS("ip_set_hash:mac");
30 /* Type specific function prefix */
31 #define HTYPE hash_mac
34 struct hash_mac4_elem {
35 /* Zero valued IP addresses cannot be stored */
37 unsigned char ether[ETH_ALEN];
42 /* Common functions */
45 hash_mac4_data_equal(const struct hash_mac4_elem *e1,
46 const struct hash_mac4_elem *e2,
49 return ether_addr_equal(e1->ether, e2->ether);
53 hash_mac4_data_list(struct sk_buff *skb, const struct hash_mac4_elem *e)
55 return nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether);
59 hash_mac4_data_next(struct hash_mac4_elem *next,
60 const struct hash_mac4_elem *e)
64 #define MTYPE hash_mac4
67 #define IP_SET_EMIT_CREATE
68 #define IP_SET_PROTO_UNDEF
69 #include "ip_set_hash_gen.h"
71 /* Zero valued element is not supported */
72 static const unsigned char invalid_ether[ETH_ALEN] = { 0 };
75 hash_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)
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);
83 /* MAC can be src only */
84 if (!(opt->flags & IPSET_DIM_ONE_SRC))
87 if (skb_mac_header(skb) < skb->head ||
88 (skb_mac_header(skb) + ETH_HLEN) > skb->data)
91 memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN);
92 if (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0)
94 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
98 hash_mac4_uadt(struct ip_set *set, struct nlattr *tb[],
99 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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);
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;
115 if (tb[IPSET_ATTR_LINENO])
116 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
118 ret = ip_set_get_extensions(set, tb, &ext);
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;
125 return adtfn(set, &e, &ext, &ext, flags);
128 static struct ip_set_type hash_mac_type __read_mostly = {
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,
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 },
146 [IPSET_ATTR_ETHER] = { .type = NLA_BINARY,
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 },
163 return ip_set_type_register(&hash_mac_type);
169 ip_set_type_unregister(&hash_mac_type);
172 module_init(hash_mac_init);
173 module_exit(hash_mac_fini);