The module implements the hash:net type support in four flavours:
for IPv4 and IPv6, both without and with timeout support. The elements
are one dimensional: IPv4/IPv6 network address/prefixes.
Signed-off-by: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>
---
net/netfilter/ipset/Kconfig | 9 +
net/netfilter/ipset/Makefile | 1 +
net/netfilter/ipset/ip_set_hash_net.c | 486 +++++++++++++++++++++++++++++++++
3 files changed, 496 insertions(+), 0 deletions(-)
create mode 100644 net/netfilter/ipset/ip_set_hash_net.c
diff --git a/net/netfilter/ipset/Kconfig b/net/netfilter/ipset/Kconfig
index 55167e4..e3e0eb2 100644
--- a/net/netfilter/ipset/Kconfig
+++ b/net/netfilter/ipset/Kconfig
@@ -89,4 +89,13 @@ config IP_SET_HASH_IPPORTNET
To compile it as a module, choose M here. If unsure, say N.
+config IP_SET_HASH_NET
+ tristate "hash:net set support"
+ depends on IP_SET
+ help
+ This option adds the hash:net set type support, by which
+ one can store IPv4/IPv6 network address/prefix elements.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
endif # IP_SET
diff --git a/net/netfilter/ipset/Makefile b/net/netfilter/ipset/Makefile
index 1d776ed..8a7d452 100644
--- a/net/netfilter/ipset/Makefile
+++ b/net/netfilter/ipset/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_IP_SET_HASH_IP) += ip_set_hash_ip.o
obj-$(CONFIG_IP_SET_HASH_IPPORT) += ip_set_hash_ipport.o
obj-$(CONFIG_IP_SET_HASH_IPPORTIP) += ip_set_hash_ipportip.o
obj-$(CONFIG_IP_SET_HASH_IPPORTNET) += ip_set_hash_ipportnet.o
+obj-$(CONFIG_IP_SET_HASH_NET) += ip_set_hash_net.o
diff --git a/net/netfilter/ipset/ip_set_hash_net.c b/net/netfilter/ipset/ip_set_hash_net.c
new file mode 100644
index 0000000..a249e07
--- /dev/null
+++ b/net/netfilter/ipset/ip_set_hash_net.c
@@ -0,0 +1,486 @@
+/* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>
+ *
+ * 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:net type */
+
+#include <linux/netfilter/ipset/ip_set_kernel.h>
+#include <linux/jhash.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/uaccess.h>
+#include <linux/bitops.h>
+#include <linux/spinlock.h>
+#include <linux/random.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/netlink.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/ipset/pfxlen.h>
+#include <linux/netfilter/ipset/ip_set.h>
+#include <linux/netfilter/ipset/ip_set_timeout.h>
+#include <linux/netfilter/ipset/ip_set_hash.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("hash:net type of IP sets");
+MODULE_ALIAS("ip_set_hash:net");
+
+/* Type specific function prefix */
+#define TYPE hash_net
+
+static bool
+hash_net_same_set(const struct ip_set *a, const struct ip_set *b);
+
+#define hash_net4_same_set hash_net_same_set
+#define hash_net6_same_set hash_net_same_set
+
+/* The type variant functions: IPv4 */
+
+/* Member elements without timeout */
+struct hash_net4_elem {
+ u32 ip;
+ u16 padding0;
+ u8 padding1;
+ u8 cidr;
+};
+
+/* Member elements with timeout support */
+struct hash_net4_telem {
+ u32 ip;
+ u16 padding0;
+ u8 padding1;
+ u8 cidr;
+ unsigned long timeout;
+};
+
+static inline bool
+hash_net4_data_equal(const struct hash_net4_elem *ip1,
+ const struct hash_net4_elem *ip2)
+{
+ return ip1->ip == ip2->ip && ip1->cidr == ip2->cidr;
+}
+
+static inline bool
+hash_net4_data_isnull(const struct hash_net4_elem *elem)
+{
+ return elem->cidr == 0;
+}
+
+static inline void
+hash_net4_data_copy(struct hash_net4_elem *dst,
+ const struct hash_net4_elem *src)
+{
+ dst->ip = src->ip;
+ dst->cidr = src->cidr;
+}
+
+static inline void
+hash_net4_data_swap(struct hash_net4_elem *dst,
+ struct hash_net4_elem *src)
+{
+ swap(dst->ip, src->ip);
+ swap(dst->cidr, src->cidr);
+}
+
+static inline void
+hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
+{
+ elem->ip &= NETMASK(cidr);
+ elem->cidr = cidr;
+}
+
+/* Zero CIDR values cannot be stored */
+static inline void
+hash_net4_data_zero_out(struct hash_net4_elem *elem)
+{
+ elem->cidr = 0;
+}
+
+static inline bool
+hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
+{
+ NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, data->ip);
+ NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
+ return 0;
+
+nla_put_failure:
+ return 1;
+}
+
+static inline bool
+hash_net4_data_tlist(struct sk_buff *skb, const struct hash_net4_elem *data)
+{
+ const struct hash_net4_telem *tdata =
+ (const struct hash_net4_telem *)data;
+
+ NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, tdata->ip);
+ NLA_PUT_U8(skb, IPSET_ATTR_CIDR, tdata->cidr);
+ NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,
+ htonl(ip_set_timeout_get(tdata->timeout)));
+
+ return 0;
+
+nla_put_failure:
+ return 1;
+}
+
+#define IP_SET_HASH_WITH_NETS
+
+#define PF 4
+#define HOST_MASK 32
+#include <linux/netfilter/ipset/ip_set_ahash.h>
+
+static int
+hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
+ enum ipset_adt adt, u8 pf, u8 dim, u8 flags)
+{
+ const struct ip_set_hash *h = set->data;
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ struct hash_net4_elem data = { .cidr = h->nets[0].cidr || HOST_MASK };
+
+ if (data.cidr == 0)
+ return -EINVAL;
+ if (adt == IPSET_TEST)
+ data.cidr = HOST_MASK;
+
+ ip4addrptr(skb, flags & IPSET_DIM_ONE_SRC, &data.ip);
+ data.ip &= NETMASK(data.cidr);
+
+ return adtfn(set, &data, h->timeout);
+}
+
+static const struct nla_policy hash_net_adt_policy[IPSET_ATTR_ADT_MAX + 1] = {
+ [IPSET_ATTR_IP] = { .type = NLA_NESTED },
+ [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
+ [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
+};
+
+static int
+hash_net4_uadt(struct ip_set *set, struct nlattr *head, int len,
+ enum ipset_adt adt, u32 *lineno, u32 flags)
+{
+ const struct ip_set_hash *h = set->data;
+ struct nlattr *tb[IPSET_ATTR_ADT_MAX+1];
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ struct hash_net4_elem data = { .cidr = HOST_MASK };
+ u32 timeout = h->timeout;
+ int ret;
+
+ if (nla_parse(tb, IPSET_ATTR_ADT_MAX, head, len,
+ hash_net_adt_policy))
+ 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, &data.ip);
+ if (ret)
+ return ret;
+
+ if (tb[IPSET_ATTR_CIDR])
+ data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
+
+ if (!data.cidr)
+ return -IPSET_ERR_INVALID_CIDR;
+
+ data.ip &= NETMASK(data.cidr);
+
+ if (tb[IPSET_ATTR_TIMEOUT]) {
+ if (!with_timeout(h->timeout))
+ return -IPSET_ERR_TIMEOUT;
+ timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
+ }
+
+ ret = adtfn(set, &data, timeout);
+
+ return ip_set_eexist(ret, flags) ? 0 : ret;
+}
+
+static bool
+hash_net_same_set(const struct ip_set *a, const struct ip_set *b)
+{
+ const struct ip_set_hash *x = a->data;
+ const struct ip_set_hash *y = b->data;
+
+ /* Resizing changes htable_bits, so we ignore it */
+ return x->maxelem == y->maxelem
+ && x->timeout == y->timeout;
+}
+
+/* The type variant functions: IPv6 */
+
+struct hash_net6_elem {
+ union nf_inet_addr ip;
+ u16 padding0;
+ u8 padding1;
+ u8 cidr;
+};
+
+struct hash_net6_telem {
+ union nf_inet_addr ip;
+ u16 padding0;
+ u8 padding1;
+ u8 cidr;
+ unsigned long timeout;
+};
+
+static inline bool
+hash_net6_data_equal(const struct hash_net6_elem *ip1,
+ const struct hash_net6_elem *ip2)
+{
+ return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0
+ && ip1->cidr == ip2->cidr;
+}
+
+static inline bool
+hash_net6_data_isnull(const struct hash_net6_elem *elem)
+{
+ return elem->cidr == 0;
+}
+
+static inline void
+hash_net6_data_copy(struct hash_net6_elem *dst,
+ const struct hash_net6_elem *src)
+{
+ ipv6_addr_copy(&dst->ip.in6, &src->ip.in6);
+ dst->cidr = src->cidr;
+}
+
+static inline void
+hash_net6_data_swap(struct hash_net6_elem *dst, struct hash_net6_elem *src)
+{
+ struct hash_net6_elem tmp;
+
+ memcpy(&tmp, dst, sizeof(tmp));
+ memcpy(dst, src, sizeof(tmp));
+ memcpy(src, &tmp, sizeof(tmp));
+}
+
+static inline void
+hash_net6_data_zero_out(struct hash_net6_elem *elem)
+{
+ elem->cidr = 0;
+}
+
+static inline void
+ip6_netmask(union nf_inet_addr *ip, u8 prefix)
+{
+ ip->ip6[0] &= NETMASK6(prefix)[0];
+ ip->ip6[1] &= NETMASK6(prefix)[1];
+ ip->ip6[2] &= NETMASK6(prefix)[2];
+ ip->ip6[3] &= NETMASK6(prefix)[3];
+}
+
+static inline void
+hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
+{
+ ip6_netmask(&elem->ip, cidr);
+ elem->cidr = cidr;
+}
+
+static inline bool
+hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
+{
+ NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &data->ip);
+ NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
+ return 0;
+
+nla_put_failure:
+ return 1;
+}
+
+static inline bool
+hash_net6_data_tlist(struct sk_buff *skb, const struct hash_net6_elem *data)
+{
+ const struct hash_net6_telem *e =
+ (const struct hash_net6_telem *)data;
+
+ NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &e->ip);
+ NLA_PUT_U8(skb, IPSET_ATTR_CIDR, e->cidr);
+ NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,
+ htonl(ip_set_timeout_get(e->timeout)));
+ return 0;
+
+nla_put_failure:
+ return 1;
+}
+
+#undef PF
+#undef HOST_MASK
+
+#define PF 6
+#define HOST_MASK 128
+#include <linux/netfilter/ipset/ip_set_ahash.h>
+
+static int
+hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
+ enum ipset_adt adt, u8 pf, u8 dim, u8 flags)
+{
+ const struct ip_set_hash *h = set->data;
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ struct hash_net6_elem data = { .cidr = h->nets[0].cidr || HOST_MASK };
+
+ if (data.cidr == 0)
+ return -EINVAL;
+ if (adt == IPSET_TEST)
+ data.cidr = HOST_MASK;
+
+ ip6addrptr(skb, flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
+ ip6_netmask(&data.ip, data.cidr);
+
+ return adtfn(set, &data, h->timeout);
+}
+
+static int
+hash_net6_uadt(struct ip_set *set, struct nlattr *head, int len,
+ enum ipset_adt adt, u32 *lineno, u32 flags)
+{
+ const struct ip_set_hash *h = set->data;
+ struct nlattr *tb[IPSET_ATTR_ADT_MAX+1];
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ struct hash_net6_elem data = { .cidr = HOST_MASK };
+ u32 timeout = h->timeout;
+ int ret;
+
+ if (nla_parse(tb, IPSET_ATTR_ADT_MAX, head, len,
+ hash_net_adt_policy))
+ 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, &data.ip);
+ if (ret)
+ return ret;
+
+ if (tb[IPSET_ATTR_CIDR])
+ data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
+
+ if (!data.cidr)
+ return -IPSET_ERR_INVALID_CIDR;
+
+ ip6_netmask(&data.ip, data.cidr);
+
+ if (tb[IPSET_ATTR_TIMEOUT]) {
+ if (!with_timeout(h->timeout))
+ return -IPSET_ERR_TIMEOUT;
+ timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
+ }
+
+ ret = adtfn(set, &data, timeout);
+
+ return ip_set_eexist(ret, flags) ? 0 : ret;
+}
+
+/* Create hash:ip type of sets */
+
+static const struct nla_policy
+hash_net_create_policy[IPSET_ATTR_CREATE_MAX+1] = {
+ [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 },
+};
+
+static int
+hash_net_create(struct ip_set *set, struct nlattr *head, int len, u32 flags)
+{
+ struct nlattr *tb[IPSET_ATTR_CREATE_MAX+1];
+ u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
+ struct ip_set_hash *h;
+ u8 hbits;
+
+ if (!(set->family == AF_INET || set->family == AF_INET6))
+ return -IPSET_ERR_INVALID_FAMILY;
+
+ if (nla_parse(tb, IPSET_ATTR_CREATE_MAX, head, len,
+ hash_net_create_policy))
+ return -IPSET_ERR_PROTOCOL;
+
+ if (tb[IPSET_ATTR_HASHSIZE]) {
+ hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
+ if (hashsize < IPSET_MIMINAL_HASHSIZE)
+ hashsize = IPSET_MIMINAL_HASHSIZE;
+ }
+
+ if (tb[IPSET_ATTR_MAXELEM])
+ maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
+
+ h = kzalloc(sizeof(*h)
+ + sizeof(struct ip_set_hash_nets)
+ * (set->family == AF_INET ? 32 : 128), GFP_KERNEL);
+ if (!h)
+ return -ENOMEM;
+
+ h->maxelem = maxelem;
+ get_random_bytes(&h->initval, sizeof(h->initval));
+ h->timeout = IPSET_NO_TIMEOUT;
+
+ hbits = htable_bits(hashsize);
+ h->table = ip_set_alloc(
+ sizeof(struct htable)
+ + jhash_size(hbits) * sizeof(struct hbucket),
+ GFP_KERNEL);
+ if (!h->table) {
+ kfree(h);
+ return -ENOMEM;
+ }
+ h->table->htable_bits = hbits;
+
+ set->data = h;
+
+ if (tb[IPSET_ATTR_TIMEOUT]) {
+ h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
+
+ set->variant = set->family == AF_INET
+ ? &hash_net4_tvariant : &hash_net6_tvariant;
+
+ if (set->family == AF_INET)
+ hash_net4_gc_init(set);
+ else
+ hash_net6_gc_init(set);
+ } else {
+ set->variant = set->family == AF_INET
+ ? &hash_net4_variant : &hash_net6_variant;
+ }
+
+ pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)",
+ set->name, jhash_size(h->table->htable_bits),
+ h->table->htable_bits, h->maxelem, set->data, h->table);
+
+ return 0;
+}
+
+static struct ip_set_type hash_net_type __read_mostly = {
+ .name = "hash:net",
+ .protocol = IPSET_PROTOCOL,
+ .features = IPSET_TYPE_IP,
+ .dimension = IPSET_DIM_ONE,
+ .family = AF_UNSPEC,
+ .revision = 0,
+ .create = hash_net_create,
+ .me = THIS_MODULE,
+};
+
+static int __init
+hash_net_init(void)
+{
+ return ip_set_type_register(&hash_net_type);
+}
+
+static void __exit
+hash_net_fini(void)
+{
+ ip_set_type_unregister(&hash_net_type);
+}
+
+module_init(hash_net_init);
+module_exit(hash_net_fini);
--
1.7.0.4
--
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