From 4652cd11938b7ed2ad16cbb80698caa44b0e53bb Mon Sep 17 00:00:00 2001 From: Jozsef Kadlecsik Date: Mon, 15 Sep 2014 17:36:06 +0200 Subject: hash:mac type added to ipset --- kernel/net/netfilter/ipset/ip_set_hash_mac.c | 173 +++++++++++++++++++++++++++ 1 file changed, 173 insertions(+) create mode 100644 kernel/net/netfilter/ipset/ip_set_hash_mac.c (limited to 'kernel/net/netfilter/ipset/ip_set_hash_mac.c') diff --git a/kernel/net/netfilter/ipset/ip_set_hash_mac.c b/kernel/net/netfilter/ipset/ip_set_hash_mac.c new file mode 100644 index 0000000..65690b5 --- /dev/null +++ b/kernel/net/netfilter/ipset/ip_set_hash_mac.c @@ -0,0 +1,173 @@ +/* Copyright (C) 2014 Jozsef Kadlecsik + * + * 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 +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define IPSET_TYPE_REV_MIN 0 +#define IPSET_TYPE_REV_MAX 0 + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jozsef Kadlecsik "); +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) +{ + return nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether); +} + +static inline void +hash_mac4_data_next(struct hash_mac4_elem *next, + const struct hash_mac4_elem *e) +{ +} + +#define MTYPE hash_mac4 +#define PF 4 +#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; + + memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN); + 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 (unlikely(!tb[IPSET_ATTR_ETHER] || + !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) + return -IPSET_ERR_PROTOCOL; + + if (tb[IPSET_ATTR_LINENO]) + *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); + + ret = ip_set_get_extensions(set, tb, &ext); + if (ret) + return ret; + memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); + 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 }, + [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) +{ + ip_set_type_unregister(&hash_mac_type); +} + +module_init(hash_mac_init); +module_exit(hash_mac_fini); -- cgit v1.2.3