174 lines
4.8 KiB
C
174 lines
4.8 KiB
C
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/* Copyright (C) 2014 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* Kernel module implementing an IP set type: the hash:mac type */
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#include <linux/jhash.h>
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#include <linux/module.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/if_ether.h>
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#include <net/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/ipset/ip_set.h>
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#include <linux/netfilter/ipset/ip_set_hash.h>
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#define IPSET_TYPE_REV_MIN 0
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#define IPSET_TYPE_REV_MAX 0
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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IP_SET_MODULE_DESC("hash:mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
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MODULE_ALIAS("ip_set_hash:mac");
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/* Type specific function prefix */
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#define HTYPE hash_mac
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/* Member elements */
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struct hash_mac4_elem {
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/* Zero valued IP addresses cannot be stored */
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union {
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unsigned char ether[ETH_ALEN];
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__be32 foo[2];
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};
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};
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/* Common functions */
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static inline bool
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hash_mac4_data_equal(const struct hash_mac4_elem *e1,
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const struct hash_mac4_elem *e2,
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u32 *multi)
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{
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return ether_addr_equal(e1->ether, e2->ether);
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}
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static inline bool
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hash_mac4_data_list(struct sk_buff *skb, const struct hash_mac4_elem *e)
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{
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return nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether);
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}
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static inline void
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hash_mac4_data_next(struct hash_mac4_elem *next,
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const struct hash_mac4_elem *e)
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{
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}
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#define MTYPE hash_mac4
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#define PF 4
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#define HOST_MASK 32
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#define IP_SET_EMIT_CREATE
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#define IP_SET_PROTO_UNDEF
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#include "ip_set_hash_gen.h"
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/* Zero valued element is not supported */
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static const unsigned char invalid_ether[ETH_ALEN] = { 0 };
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static int
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hash_mac4_kadt(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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enum ipset_adt adt, struct ip_set_adt_opt *opt)
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{
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } };
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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/* MAC can be src only */
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if (!(opt->flags & IPSET_DIM_ONE_SRC))
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return 0;
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if (skb_mac_header(skb) < skb->head ||
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(skb_mac_header(skb) + ETH_HLEN) > skb->data)
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return -EINVAL;
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memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN);
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if (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0)
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return -EINVAL;
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return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
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}
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static int
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hash_mac4_uadt(struct ip_set *set, struct nlattr *tb[],
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enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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{
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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int ret;
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if (unlikely(!tb[IPSET_ATTR_ETHER] ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
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return -IPSET_ERR_PROTOCOL;
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if (tb[IPSET_ATTR_LINENO])
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*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
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ret = ip_set_get_extensions(set, tb, &ext);
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if (ret)
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return ret;
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memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
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if (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0)
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return -IPSET_ERR_HASH_ELEM;
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return adtfn(set, &e, &ext, &ext, flags);
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}
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static struct ip_set_type hash_mac_type __read_mostly = {
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.name = "hash:mac",
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.protocol = IPSET_PROTOCOL,
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.features = IPSET_TYPE_MAC,
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.dimension = IPSET_DIM_ONE,
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.family = NFPROTO_UNSPEC,
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.revision_min = IPSET_TYPE_REV_MIN,
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.revision_max = IPSET_TYPE_REV_MAX,
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.create = hash_mac_create,
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.create_policy = {
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[IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
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[IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
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[IPSET_ATTR_PROBES] = { .type = NLA_U8 },
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[IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
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[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
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[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
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},
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.adt_policy = {
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[IPSET_ATTR_ETHER] = { .type = NLA_BINARY,
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.len = ETH_ALEN },
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[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
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[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
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[IPSET_ATTR_BYTES] = { .type = NLA_U64 },
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[IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
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[IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
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[IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
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[IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
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[IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
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},
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.me = THIS_MODULE,
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};
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static int __init
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hash_mac_init(void)
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{
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return ip_set_type_register(&hash_mac_type);
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}
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static void __exit
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hash_mac_fini(void)
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{
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ip_set_type_unregister(&hash_mac_type);
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}
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module_init(hash_mac_init);
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module_exit(hash_mac_fini);
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