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 if (nla_put(skb
, IPSET_ATTR_ETHER
, ETH_ALEN
, e
->ether
))
64 hash_mac4_data_next(struct hash_mac4_elem
*next
,
65 const struct hash_mac4_elem
*e
)
69 #define MTYPE hash_mac4
71 #define IP_SET_EMIT_CREATE
72 #define IP_SET_PROTO_UNDEF
73 #include "ip_set_hash_gen.h"
75 /* Zero valued element is not supported */
76 static const unsigned char invalid_ether
[ETH_ALEN
] = { 0 };
79 hash_mac4_kadt(struct ip_set
*set
, const struct sk_buff
*skb
,
80 const struct xt_action_param
*par
,
81 enum ipset_adt adt
, struct ip_set_adt_opt
*opt
)
83 ipset_adtfn adtfn
= set
->variant
->adt
[adt
];
84 struct hash_mac4_elem e
= { { .foo
[0] = 0, .foo
[1] = 0 } };
85 struct ip_set_ext ext
= IP_SET_INIT_KEXT(skb
, opt
, set
);
87 /* MAC can be src only */
88 if (!(opt
->flags
& IPSET_DIM_ONE_SRC
))
91 if (skb_mac_header(skb
) < skb
->head
||
92 (skb_mac_header(skb
) + ETH_HLEN
) > skb
->data
)
95 ether_addr_copy(e
.ether
, eth_hdr(skb
)->h_source
);
96 if (memcmp(e
.ether
, invalid_ether
, ETH_ALEN
) == 0)
98 return adtfn(set
, &e
, &ext
, &opt
->ext
, opt
->cmdflags
);
102 hash_mac4_uadt(struct ip_set
*set
, struct nlattr
*tb
[],
103 enum ipset_adt adt
, u32
*lineno
, u32 flags
, bool retried
)
105 ipset_adtfn adtfn
= set
->variant
->adt
[adt
];
106 struct hash_mac4_elem e
= { { .foo
[0] = 0, .foo
[1] = 0 } };
107 struct ip_set_ext ext
= IP_SET_INIT_UEXT(set
);
110 if (tb
[IPSET_ATTR_LINENO
])
111 *lineno
= nla_get_u32(tb
[IPSET_ATTR_LINENO
]);
113 if (unlikely(!tb
[IPSET_ATTR_ETHER
] ||
114 nla_len(tb
[IPSET_ATTR_ETHER
]) != ETH_ALEN
))
115 return -IPSET_ERR_PROTOCOL
;
117 ret
= ip_set_get_extensions(set
, tb
, &ext
);
120 ether_addr_copy(e
.ether
, nla_data(tb
[IPSET_ATTR_ETHER
]));
121 if (memcmp(e
.ether
, invalid_ether
, ETH_ALEN
) == 0)
122 return -IPSET_ERR_HASH_ELEM
;
124 return adtfn(set
, &e
, &ext
, &ext
, flags
);
127 static struct ip_set_type hash_mac_type __read_mostly
= {
129 .protocol
= IPSET_PROTOCOL
,
130 .features
= IPSET_TYPE_MAC
,
131 .dimension
= IPSET_DIM_ONE
,
132 .family
= NFPROTO_UNSPEC
,
133 .revision_min
= IPSET_TYPE_REV_MIN
,
134 .revision_max
= IPSET_TYPE_REV_MAX
,
135 .create
= hash_mac_create
,
137 [IPSET_ATTR_HASHSIZE
] = { .type
= NLA_U32
},
138 [IPSET_ATTR_MAXELEM
] = { .type
= NLA_U32
},
139 [IPSET_ATTR_PROBES
] = { .type
= NLA_U8
},
140 [IPSET_ATTR_RESIZE
] = { .type
= NLA_U8
},
141 [IPSET_ATTR_TIMEOUT
] = { .type
= NLA_U32
},
142 [IPSET_ATTR_CADT_FLAGS
] = { .type
= NLA_U32
},
145 [IPSET_ATTR_ETHER
] = { .type
= NLA_BINARY
,
147 [IPSET_ATTR_TIMEOUT
] = { .type
= NLA_U32
},
148 [IPSET_ATTR_LINENO
] = { .type
= NLA_U32
},
149 [IPSET_ATTR_BYTES
] = { .type
= NLA_U64
},
150 [IPSET_ATTR_PACKETS
] = { .type
= NLA_U64
},
151 [IPSET_ATTR_COMMENT
] = { .type
= NLA_NUL_STRING
,
152 .len
= IPSET_MAX_COMMENT_SIZE
},
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
);
170 ip_set_type_unregister(&hash_mac_type
);
173 module_init(hash_mac_init
);
174 module_exit(hash_mac_fini
);