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authorOliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>2013-09-20 10:13:53 +0200
committerJozsef Kadlecsik <kadlec@blackhole.kfki.hu>2013-09-20 21:22:47 +0200
commit560c3b54e572d383f0931e4d82c5734725152030 (patch)
tree9b81ae4a2d65f7a0f51b9cedceda208b0b4ca6d5 /kernel/net/netfilter/ipset/ip_set_hash_netnet.c
parent7f106caaa36ea449a1641345d777f96d156bb03e (diff)
netfilter: ipset: Add hash:net,net module to kernel.
This adds a new set that provides the ability to configure pairs of subnets. A small amount of additional handling code has been added to the generic hash header file - this code is conditionally activated by a preprocessor definition. Signed-off-by: Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa> Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Diffstat (limited to 'kernel/net/netfilter/ipset/ip_set_hash_netnet.c')
-rw-r--r--kernel/net/netfilter/ipset/ip_set_hash_netnet.c482
1 files changed, 482 insertions, 0 deletions
diff --git a/kernel/net/netfilter/ipset/ip_set_hash_netnet.c b/kernel/net/netfilter/ipset/ip_set_hash_netnet.c
new file mode 100644
index 0000000..771ce2b
--- /dev/null
+++ b/kernel/net/netfilter/ipset/ip_set_hash_netnet.c
@@ -0,0 +1,482 @@
+/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ * Copyright (C) 2013 Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>
+ *
+ * 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/jhash.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/skbuff.h>
+#include <linux/errno.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_hash.h>
+
+#define IPSET_TYPE_REV_MIN 0
+#define IPSET_TYPE_REV_MAX 0
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>");
+IP_SET_MODULE_DESC("hash:net,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
+MODULE_ALIAS("ip_set_hash:net,net");
+
+/* Type specific function prefix */
+#define HTYPE hash_netnet
+#define IP_SET_HASH_WITH_NETS
+#define IPSET_NET_COUNT 2
+
+/* IPv4 variants */
+
+/* Member elements */
+struct hash_netnet4_elem {
+ union {
+ __be32 ip[2];
+ __be64 ipcmp;
+ };
+ u8 nomatch;
+ union {
+ u8 cidr[2];
+ u16 ccmp;
+ };
+};
+
+/* Common functions */
+
+static inline bool
+hash_netnet4_data_equal(const struct hash_netnet4_elem *ip1,
+ const struct hash_netnet4_elem *ip2,
+ u32 *multi)
+{
+ return ip1->ipcmp == ip2->ipcmp &&
+ ip2->ccmp == ip2->ccmp;
+}
+
+static inline int
+hash_netnet4_do_data_match(const struct hash_netnet4_elem *elem)
+{
+ return elem->nomatch ? -ENOTEMPTY : 1;
+}
+
+static inline void
+hash_netnet4_data_set_flags(struct hash_netnet4_elem *elem, u32 flags)
+{
+ elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
+}
+
+static inline void
+hash_netnet4_data_reset_flags(struct hash_netnet4_elem *elem, u8 *flags)
+{
+ swap(*flags, elem->nomatch);
+}
+
+static inline void
+hash_netnet4_data_reset_elem(struct hash_netnet4_elem *elem,
+ struct hash_netnet4_elem *orig)
+{
+ elem->ip[1] = orig->ip[1];
+}
+
+static inline void
+hash_netnet4_data_netmask(struct hash_netnet4_elem *elem, u8 cidr, bool inner)
+{
+ if (inner) {
+ elem->ip[1] &= ip_set_netmask(cidr);
+ elem->cidr[1] = cidr;
+ } else {
+ elem->ip[0] &= ip_set_netmask(cidr);
+ elem->cidr[0] = cidr;
+ }
+}
+
+static bool
+hash_netnet4_data_list(struct sk_buff *skb,
+ const struct hash_netnet4_elem *data)
+{
+ u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
+
+ if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip[0]) ||
+ nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip[1]) ||
+ nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
+ nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
+ (flags &&
+ nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return 1;
+}
+
+static inline void
+hash_netnet4_data_next(struct hash_netnet4_elem *next,
+ const struct hash_netnet4_elem *d)
+{
+ next->ipcmp = d->ipcmp;
+}
+
+#define MTYPE hash_netnet4
+#define PF 4
+#define HOST_MASK 32
+#include "ip_set_hash_gen.h"
+
+static int
+hash_netnet4_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)
+{
+ const struct hash_netnet *h = set->data;
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ struct hash_netnet4_elem e = {
+ .cidr[0] = h->nets[0].cidr[0] ? h->nets[0].cidr[0] : HOST_MASK,
+ .cidr[1] = h->nets[0].cidr[1] ? h->nets[0].cidr[1] : HOST_MASK,
+ };
+ struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
+
+ if (adt == IPSET_TEST)
+ e.ccmp = (HOST_MASK << (sizeof(e.cidr[0]) * 8)) | HOST_MASK;
+
+ ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0]);
+ ip4addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1]);
+ e.ip[0] &= ip_set_netmask(e.cidr[0]);
+ e.ip[1] &= ip_set_netmask(e.cidr[1]);
+
+ return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
+}
+
+static int
+hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[],
+ enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
+{
+ const struct hash_netnet *h = set->data;
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ struct hash_netnet4_elem e = { .cidr[0] = HOST_MASK,
+ .cidr[1] = HOST_MASK };
+ struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
+ u32 ip = 0, ip_to = 0, last;
+ u32 ip2 = 0, ip2_from = 0, ip2_to = 0, last2;
+ u8 cidr, cidr2;
+ int ret;
+
+ if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
+ return -IPSET_ERR_PROTOCOL;
+
+ if (tb[IPSET_ATTR_LINENO])
+ *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
+
+ ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
+ ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from) ||
+ ip_set_get_extensions(set, tb, &ext);
+ if (ret)
+ return ret;
+
+ if (tb[IPSET_ATTR_CIDR]) {
+ cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
+ if (!cidr || cidr > HOST_MASK)
+ return -IPSET_ERR_INVALID_CIDR;
+ e.cidr[0] = cidr;
+ }
+
+ if (tb[IPSET_ATTR_CIDR2]) {
+ cidr2 = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
+ if (!cidr2 || cidr2 > HOST_MASK)
+ return -IPSET_ERR_INVALID_CIDR;
+ e.cidr[1] = cidr2;
+ }
+
+ if (tb[IPSET_ATTR_CADT_FLAGS]) {
+ u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
+ if (cadt_flags & IPSET_FLAG_NOMATCH)
+ flags |= (IPSET_FLAG_NOMATCH << 16);
+ }
+
+ if (adt == IPSET_TEST || !(tb[IPSET_ATTR_IP_TO] &&
+ tb[IPSET_ATTR_IP2_TO])) {
+ e.ip[0] = htonl(ip & ip_set_hostmask(e.cidr[0]));
+ e.ip[1] = htonl(ip2_from & ip_set_hostmask(e.cidr[1]));
+ ret = adtfn(set, &e, &ext, &ext, flags);
+ return ip_set_enomatch(ret, flags, adt, set) ? -ret :
+ ip_set_eexist(ret, flags) ? 0 : ret;
+ }
+
+ ip_to = ip;
+ if (tb[IPSET_ATTR_IP_TO]) {
+ ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
+ if (ret)
+ return ret;
+ if (ip_to < ip)
+ swap(ip, ip_to);
+ if (ip + UINT_MAX == ip_to)
+ return -IPSET_ERR_HASH_RANGE;
+ }
+
+ ip2_to = ip2_from;
+ if (tb[IPSET_ATTR_IP2_TO]) {
+ ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
+ if (ret)
+ return ret;
+ if (ip2_to < ip2_from)
+ swap(ip2_from, ip2_to);
+ if (ip2_from + UINT_MAX == ip2_to)
+ return -IPSET_ERR_HASH_RANGE;
+
+ }
+
+ if (retried)
+ ip = ntohl(h->next.ip[0]);
+
+ while (!after(ip, ip_to)) {
+ e.ip[0] = htonl(ip);
+ last = ip_set_range_to_cidr(ip, ip_to, &cidr);
+ e.cidr[0] = cidr;
+ ip2 = (retried &&
+ ip == ntohl(h->next.ip[0])) ? ntohl(h->next.ip[1])
+ : ip2_from;
+ while (!after(ip2, ip2_to)) {
+ e.ip[1] = htonl(ip2);
+ last2 = ip_set_range_to_cidr(ip2, ip2_to, &cidr2);
+ e.cidr[1] = cidr2;
+ ret = adtfn(set, &e, &ext, &ext, flags);
+ if (ret && !ip_set_eexist(ret, flags))
+ return ret;
+ else
+ ret = 0;
+ ip2 = last2 + 1;
+ }
+ ip = last + 1;
+ }
+ return ret;
+}
+
+/* IPv6 variants */
+
+struct hash_netnet6_elem {
+ union nf_inet_addr ip[2];
+ u8 nomatch;
+ union {
+ u8 cidr[2];
+ u16 ccmp;
+ };
+};
+
+/* Common functions */
+
+static inline bool
+hash_netnet6_data_equal(const struct hash_netnet6_elem *ip1,
+ const struct hash_netnet6_elem *ip2,
+ u32 *multi)
+{
+ return ipv6_addr_equal(&ip1->ip[0].in6, &ip2->ip[0].in6) &&
+ ipv6_addr_equal(&ip1->ip[1].in6, &ip2->ip[1].in6) &&
+ ip1->ccmp == ip2->ccmp;
+}
+
+static inline int
+hash_netnet6_do_data_match(const struct hash_netnet6_elem *elem)
+{
+ return elem->nomatch ? -ENOTEMPTY : 1;
+}
+
+static inline void
+hash_netnet6_data_set_flags(struct hash_netnet6_elem *elem, u32 flags)
+{
+ elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
+}
+
+static inline void
+hash_netnet6_data_reset_flags(struct hash_netnet6_elem *elem, u8 *flags)
+{
+ swap(*flags, elem->nomatch);
+}
+
+static inline void
+hash_netnet6_data_reset_elem(struct hash_netnet6_elem *elem,
+ struct hash_netnet6_elem *orig)
+{
+ elem->ip[1] = orig->ip[1];
+}
+
+static inline void
+hash_netnet6_data_netmask(struct hash_netnet6_elem *elem, u8 cidr, bool inner)
+{
+ if (inner) {
+ ip6_netmask(&elem->ip[1], cidr);
+ elem->cidr[1] = cidr;
+ } else {
+ ip6_netmask(&elem->ip[0], cidr);
+ elem->cidr[0] = cidr;
+ }
+}
+
+static bool
+hash_netnet6_data_list(struct sk_buff *skb,
+ const struct hash_netnet6_elem *data)
+{
+ u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
+
+ if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip[0].in6) ||
+ nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip[1].in6) ||
+ nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
+ nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
+ (flags &&
+ nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return 1;
+}
+
+static inline void
+hash_netnet6_data_next(struct hash_netnet4_elem *next,
+ const struct hash_netnet6_elem *d)
+{
+}
+
+#undef MTYPE
+#undef PF
+#undef HOST_MASK
+
+#define MTYPE hash_netnet6
+#define PF 6
+#define HOST_MASK 128
+#define IP_SET_EMIT_CREATE
+#include "ip_set_hash_gen.h"
+
+static int
+hash_netnet6_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)
+{
+ const struct hash_netnet *h = set->data;
+ ipset_adtfn adtfn = set->variant->adt[adt];
+ struct hash_netnet6_elem e = {
+ .cidr[0] = h->nets[0].cidr[0] ? h->nets[0].cidr[0] : HOST_MASK,
+ .cidr[1] = h->nets[0].cidr[1] ? h->nets[0].cidr[1] : HOST_MASK
+ };
+ struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
+
+ if (adt == IPSET_TEST)
+ e.ccmp = (HOST_MASK << (sizeof(u8)*8)) | HOST_MASK;
+
+ ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0].in6);
+ ip6addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1].in6);
+ ip6_netmask(&e.ip[0], e.cidr[0]);
+ ip6_netmask(&e.ip[1], e.cidr[1]);
+
+ return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
+}
+
+static int
+hash_netnet6_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_netnet6_elem e = { .cidr[0] = HOST_MASK,
+ .cidr[1] = HOST_MASK };
+ struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
+ int ret;
+
+ if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
+ return -IPSET_ERR_PROTOCOL;
+ if (unlikely(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_IP2_TO]))
+ return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
+
+ if (tb[IPSET_ATTR_LINENO])
+ *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
+
+ ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip[0]) ||
+ ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip[1]) ||
+ ip_set_get_extensions(set, tb, &ext);
+ if (ret)
+ return ret;
+
+ if (tb[IPSET_ATTR_CIDR])
+ e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
+
+ if (tb[IPSET_ATTR_CIDR2])
+ e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
+
+ if (!e.cidr[0] || e.cidr[0] > HOST_MASK || !e.cidr[1] ||
+ e.cidr[1] > HOST_MASK)
+ return -IPSET_ERR_INVALID_CIDR;
+
+ ip6_netmask(&e.ip[0], e.cidr[0]);
+ ip6_netmask(&e.ip[1], e.cidr[1]);
+
+ if (tb[IPSET_ATTR_CADT_FLAGS]) {
+ u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
+ if (cadt_flags & IPSET_FLAG_NOMATCH)
+ flags |= (IPSET_FLAG_NOMATCH << 16);
+ }
+
+ ret = adtfn(set, &e, &ext, &ext, flags);
+
+ return ip_set_enomatch(ret, flags, adt, set) ? -ret :
+ ip_set_eexist(ret, flags) ? 0 : ret;
+}
+
+static struct ip_set_type hash_netnet_type __read_mostly = {
+ .name = "hash:net,net",
+ .protocol = IPSET_PROTOCOL,
+ .features = IPSET_TYPE_IP | IPSET_TYPE_IP2 | IPSET_TYPE_NOMATCH,
+ .dimension = IPSET_DIM_TWO,
+ .family = NFPROTO_UNSPEC,
+ .revision_min = IPSET_TYPE_REV_MIN,
+ .revision_max = IPSET_TYPE_REV_MAX,
+ .create = hash_netnet_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_IP_TO] = { .type = NLA_NESTED },
+ [IPSET_ATTR_IP2] = { .type = NLA_NESTED },
+ [IPSET_ATTR_IP2_TO] = { .type = NLA_NESTED },
+ [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
+ [IPSET_ATTR_CIDR2] = { .type = NLA_U8 },
+ [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
+ [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
+ [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
+ [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
+ },
+ .me = THIS_MODULE,
+};
+
+static int __init
+hash_netnet_init(void)
+{
+ return ip_set_type_register(&hash_netnet_type);
+}
+
+static void __exit
+hash_netnet_fini(void)
+{
+ ip_set_type_unregister(&hash_netnet_type);
+}
+
+module_init(hash_netnet_init);
+module_exit(hash_netnet_fini);