| /* Copyright (C) 2014 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| /* 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@blackhole.kfki.hu>"); |
| 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 inline 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 inline 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 inline 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" |
| |
| /* Zero valued element is not supported */ |
| static const unsigned char invalid_ether[ETH_ALEN] = { 0 }; |
| |
| 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); |
| |
| /* MAC can be src only */ |
| if (!(opt->flags & IPSET_DIM_ONE_SRC)) |
| return 0; |
| |
| if (skb_mac_header(skb) < skb->head || |
| (skb_mac_header(skb) + ETH_HLEN) > skb->data) |
| return -EINVAL; |
| |
| ether_addr_copy(e.ether, eth_hdr(skb)->h_source); |
| if (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0) |
| 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])) |
| 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 (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0) |
| 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); |