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- // SPDX-License-Identifier: GPL-2.0-only
- /* Copyright (C) 2014 Jozsef Kadlecsik <kadlec@netfilter.org> */
- /* Kernel module implementing an IP set type: the hash:mac type */
- #include <linux/jhash.h>
- #include <linux/module.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include <linux/errno.h>
- #include <linux/if_ether.h>
- #include <net/netlink.h>
- #include <linux/netfilter.h>
- #include <linux/netfilter/ipset/ip_set.h>
- #include <linux/netfilter/ipset/ip_set_hash.h>
- #define IPSET_TYPE_REV_MIN 0
- #define IPSET_TYPE_REV_MAX 0
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
- IP_SET_MODULE_DESC("hash:mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
- MODULE_ALIAS("ip_set_hash:mac");
- /* Type specific function prefix */
- #define HTYPE hash_mac
- /* Member elements */
- struct hash_mac4_elem {
- /* Zero valued IP addresses cannot be stored */
- union {
- unsigned char ether[ETH_ALEN];
- __be32 foo[2];
- };
- };
- /* Common functions */
- static bool
- hash_mac4_data_equal(const struct hash_mac4_elem *e1,
- const struct hash_mac4_elem *e2,
- u32 *multi)
- {
- return ether_addr_equal(e1->ether, e2->ether);
- }
- static bool
- hash_mac4_data_list(struct sk_buff *skb, const struct hash_mac4_elem *e)
- {
- if (nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether))
- goto nla_put_failure;
- return false;
- nla_put_failure:
- return true;
- }
- static void
- hash_mac4_data_next(struct hash_mac4_elem *next,
- const struct hash_mac4_elem *e)
- {
- }
- #define MTYPE hash_mac4
- #define HOST_MASK 32
- #define IP_SET_EMIT_CREATE
- #define IP_SET_PROTO_UNDEF
- #include "ip_set_hash_gen.h"
- static int
- hash_mac4_kadt(struct ip_set *set, const struct sk_buff *skb,
- const struct xt_action_param *par,
- enum ipset_adt adt, struct ip_set_adt_opt *opt)
- {
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } };
- struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
- if (skb_mac_header(skb) < skb->head ||
- (skb_mac_header(skb) + ETH_HLEN) > skb->data)
- return -EINVAL;
- if (opt->flags & IPSET_DIM_ONE_SRC)
- ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
- else
- ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
- if (is_zero_ether_addr(e.ether))
- return -EINVAL;
- return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
- }
- static int
- hash_mac4_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } };
- struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- int ret;
- if (tb[IPSET_ATTR_LINENO])
- *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
- if (unlikely(!tb[IPSET_ATTR_ETHER] ||
- nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN))
- return -IPSET_ERR_PROTOCOL;
- ret = ip_set_get_extensions(set, tb, &ext);
- if (ret)
- return ret;
- ether_addr_copy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]));
- if (is_zero_ether_addr(e.ether))
- return -IPSET_ERR_HASH_ELEM;
- return adtfn(set, &e, &ext, &ext, flags);
- }
- static struct ip_set_type hash_mac_type __read_mostly = {
- .name = "hash:mac",
- .protocol = IPSET_PROTOCOL,
- .features = IPSET_TYPE_MAC,
- .dimension = IPSET_DIM_ONE,
- .family = NFPROTO_UNSPEC,
- .revision_min = IPSET_TYPE_REV_MIN,
- .revision_max = IPSET_TYPE_REV_MAX,
- .create = hash_mac_create,
- .create_policy = {
- [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
- [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
- [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
- [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
- [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
- [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
- },
- .adt_policy = {
- [IPSET_ATTR_ETHER] = { .type = NLA_BINARY,
- .len = ETH_ALEN },
- [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
- [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
- [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
- [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
- [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
- .len = IPSET_MAX_COMMENT_SIZE },
- [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
- [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
- [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
- },
- .me = THIS_MODULE,
- };
- static int __init
- hash_mac_init(void)
- {
- return ip_set_type_register(&hash_mac_type);
- }
- static void __exit
- hash_mac_fini(void)
- {
- rcu_barrier();
- ip_set_type_unregister(&hash_mac_type);
- }
- module_init(hash_mac_init);
- module_exit(hash_mac_fini);
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