netfilter: ipset: hash:ipmac type support added to ipset

Introduce the hash:ipmac type.
Signed-off-by: Tomasz Chili??ski <tomasz.chilinski@chilan.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>

net/netfilter/ipset/Kconfig

@@ -99,6 +99,15 @@ config IP_SET_HASH_IPPORTNET
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config IP_SET_HASH_IPMAC
+	tristate "hash:ip,mac set support"
+	depends on IP_SET
+	help
+	  This option adds the hash:ip,mac set type support, by which
+	  one can store IPv4/IPv6 address and MAC (ethernet address) pairs in a set.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 config IP_SET_HASH_MAC
 	tristate "hash:mac set support"
 	depends on IP_SET

net/netfilter/ipset/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_IP_SET_BITMAP_PORT) += ip_set_bitmap_port.o
 
 # hash types
 obj-$(CONFIG_IP_SET_HASH_IP) += ip_set_hash_ip.o
+obj-$(CONFIG_IP_SET_HASH_IPMAC) += ip_set_hash_ipmac.o
 obj-$(CONFIG_IP_SET_HASH_IPMARK) += ip_set_hash_ipmark.o
 obj-$(CONFIG_IP_SET_HASH_IPPORT) += ip_set_hash_ipport.o
 obj-$(CONFIG_IP_SET_HASH_IPPORTIP) += ip_set_hash_ipportip.o

net/netfilter/ipset/ip_set_hash_ipmac.c

+/* Copyright (C) 2016 Tomasz Chilinski <tomasz.chilinski@chilan.com>
+ *
+ * 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:ip,mac type */
+
+#include <linux/jhash.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/random.h>
+#include <linux/if_ether.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/netlink.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/ipset/pfxlen.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("Tomasz Chilinski <tomasz.chilinski@chilan.com>");
+IP_SET_MODULE_DESC("hash:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
+MODULE_ALIAS("ip_set_hash:ip,mac");
+
+/* Type specific function prefix */
+#define HTYPE		hash_ipmac
+
+/* Zero valued element is not supported */
+static const unsigned char invalid_ether[ETH_ALEN] = { 0 };
+
+/* IPv4 variant */
+
+/* Member elements */
+struct hash_ipmac4_elem {
+	/* Zero valued IP addresses cannot be stored */
+	__be32 ip;
+	union {
+		unsigned char ether[ETH_ALEN];
+		__be32 foo[2];
+	};
+};
+
+/* Common functions */
+
+static inline bool
+hash_ipmac4_data_equal(const struct hash_ipmac4_elem *e1,
+		       const struct hash_ipmac4_elem *e2,
+		       u32 *multi)
+{
+	return e1->ip == e2->ip && ether_addr_equal(e1->ether, e2->ether);
+}
+
+static bool
+hash_ipmac4_data_list(struct sk_buff *skb, const struct hash_ipmac4_elem *e)
+{
+	if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip) ||
+	    nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return 1;
+}
+
+static inline void
+hash_ipmac4_data_next(struct hash_ipmac4_elem *next,
+		      const struct hash_ipmac4_elem *e)
+{
+	next->ip = e->ip;
+}
+
+#define MTYPE		hash_ipmac4
+#define PF		4
+#define HOST_MASK	32
+#define HKEY_DATALEN	sizeof(struct hash_ipmac4_elem)
+#include "ip_set_hash_gen.h"
+
+static int
+hash_ipmac4_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_ipmac4_elem e = { .ip = 0, { .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_TWO_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 (ether_addr_equal(e.ether, invalid_ether))
+		return -EINVAL;
+
+	ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
+
+	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
+}
+
+static int
+hash_ipmac4_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_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } };
+	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
+	int ret;
+
+	if (unlikely(!tb[IPSET_ATTR_IP] ||
+		     !tb[IPSET_ATTR_ETHER] ||
+		     nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN ||
+		     !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_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
+		ip_set_get_extensions(set, tb, &ext);
+	if (ret)
+		return ret;
+	memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
+	if (ether_addr_equal(e.ether, invalid_ether))
+		return -IPSET_ERR_HASH_ELEM;
+
+	return adtfn(set, &e, &ext, &ext, flags);
+}
+
+/* IPv6 variant */
+
+/* Member elements */
+struct hash_ipmac6_elem {
+	/* Zero valued IP addresses cannot be stored */
+	union nf_inet_addr ip;
+	union {
+		unsigned char ether[ETH_ALEN];
+		__be32 foo[2];
+	};
+};
+
+/* Common functions */
+
+static inline bool
+hash_ipmac6_data_equal(const struct hash_ipmac6_elem *e1,
+		       const struct hash_ipmac6_elem *e2,
+		       u32 *multi)
+{
+	return ipv6_addr_equal(&e1->ip.in6, &e2->ip.in6) &&
+		ether_addr_equal(e1->ether, e2->ether);
+}
+
+static bool
+hash_ipmac6_data_list(struct sk_buff *skb, const struct hash_ipmac6_elem *e)
+{
+	if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
+	    nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return 1;
+}
+
+static inline void
+hash_ipmac6_data_next(struct hash_ipmac6_elem *next,
+		      const struct hash_ipmac6_elem *e)
+{
+}
+
+#undef MTYPE
+#undef PF
+#undef HOST_MASK
+#undef HKEY_DATALEN
+
+#define MTYPE		hash_ipmac6
+#define PF		6
+#define HOST_MASK	128
+#define HKEY_DATALEN	sizeof(struct hash_ipmac6_elem)
+#define IP_SET_EMIT_CREATE
+#include "ip_set_hash_gen.h"
+
+static int
+hash_ipmac6_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_ipmac6_elem e = {
+		{ .all = { 0 } },
+		{ .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_TWO_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 (ether_addr_equal(e.ether, invalid_ether))
+		return -EINVAL;
+
+	ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
+
+	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
+}
+
+static int
+hash_ipmac6_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_ipmac6_elem e = {
+		{ .all = { 0 } },
+		{ .foo[0] = 0, .foo[1] = 0 }
+	};
+	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
+	int ret;
+
+	if (unlikely(!tb[IPSET_ATTR_IP] ||
+		     !tb[IPSET_ATTR_ETHER] ||
+		     nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN ||
+		     !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_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
+		ip_set_get_extensions(set, tb, &ext);
+	if (ret)
+		return ret;
+
+	memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
+	if (ether_addr_equal(e.ether, invalid_ether))
+		return -IPSET_ERR_HASH_ELEM;
+
+	return adtfn(set, &e, &ext, &ext, flags);
+}
+
+static struct ip_set_type hash_ipmac_type __read_mostly = {
+	.name		= "hash:ip,mac",
+	.protocol	= IPSET_PROTOCOL,
+	.features	= IPSET_TYPE_IP | IPSET_TYPE_MAC,
+	.dimension	= IPSET_DIM_TWO,
+	.family		= NFPROTO_UNSPEC,
+	.revision_min	= IPSET_TYPE_REV_MIN,
+	.revision_max	= IPSET_TYPE_REV_MAX,
+	.create		= hash_ipmac_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_IP]		= { .type = NLA_NESTED },
+		[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_ipmac_init(void)
+{
+	return ip_set_type_register(&hash_ipmac_type);
+}
+
+static void __exit
+hash_ipmac_fini(void)
+{
+	ip_set_type_unregister(&hash_ipmac_type);
+}
+
+module_init(hash_ipmac_init);
+module_exit(hash_ipmac_fini);