netfilter: ipt_addrtype: rename to xt_addrtype

Followup patch will add ipv6 support.

ipt_addrtype.h is retained for compatibility reasons, but no longer used
by the kernel.

Signed-off-by: Florian Westphal <fwestphal@astaro.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 135 insertions, 0 deletions

diff --git a/net/netfilter/xt_addrtype.c b/net/netfilter/xt_addrtype.c
new file mode 100644
index 00000000000..e89c0b84583
--- /dev/null
+++ b/net/netfilter/xt_addrtype.c
@@ -0,0 +1,135 @@
+/*
+ *  iptables module to match inet_addr_type() of an ip.
+ *
+ *  Copyright (c) 2004 Patrick McHardy <kaber@trash.net>
+ *  (C) 2007 Laszlo Attila Toth <panther@balabit.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.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/ip.h>
+#include <net/route.h>
+
+#include <linux/netfilter/xt_addrtype.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_DESCRIPTION("Xtables: address type match");
+MODULE_ALIAS("ipt_addrtype");
+
+static inline bool match_type(struct net *net, const struct net_device *dev,
+                              __be32 addr, u_int16_t mask)
+{
+        return !!(mask & (1 << inet_dev_addr_type(net, dev, addr)));
+}
+
+static bool
+addrtype_mt_v0(const struct sk_buff *skb, struct xt_action_param *par)
+{
+        struct net *net = dev_net(par->in ? par->in : par->out);
+        const struct xt_addrtype_info *info = par->matchinfo;
+        const struct iphdr *iph = ip_hdr(skb);
+        bool ret = true;
+
+        if (info->source)
+                ret &= match_type(net, NULL, iph->saddr, info->source) ^
+                       info->invert_source;
+        if (info->dest)
+                ret &= match_type(net, NULL, iph->daddr, info->dest) ^
+                       info->invert_dest;
+
+        return ret;
+}
+
+static bool
+addrtype_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
+{
+        struct net *net = dev_net(par->in ? par->in : par->out);
+        const struct xt_addrtype_info_v1 *info = par->matchinfo;
+        const struct iphdr *iph = ip_hdr(skb);
+        const struct net_device *dev = NULL;
+        bool ret = true;
+
+        if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN)
+                dev = par->in;
+        else if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT)
+                dev = par->out;
+
+        if (info->source)
+                ret &= match_type(net, dev, iph->saddr, info->source) ^
+                       (info->flags & XT_ADDRTYPE_INVERT_SOURCE);
+        if (ret && info->dest)
+                ret &= match_type(net, dev, iph->daddr, info->dest) ^
+                       !!(info->flags & XT_ADDRTYPE_INVERT_DEST);
+        return ret;
+}
+
+static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par)
+{
+        struct xt_addrtype_info_v1 *info = par->matchinfo;
+
+        if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN &&
+            info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) {
+                pr_info("both incoming and outgoing "
+                        "interface limitation cannot be selected\n");
+                return -EINVAL;
+        }
+
+        if (par->hook_mask & ((1 << NF_INET_PRE_ROUTING) |
+            (1 << NF_INET_LOCAL_IN)) &&
+            info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) {
+                pr_info("output interface limitation "
+                        "not valid in PREROUTING and INPUT\n");
+                return -EINVAL;
+        }
+
+        if (par->hook_mask & ((1 << NF_INET_POST_ROUTING) |
+            (1 << NF_INET_LOCAL_OUT)) &&
+            info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN) {
+                pr_info("input interface limitation "
+                        "not valid in POSTROUTING and OUTPUT\n");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static struct xt_match addrtype_mt_reg[] __read_mostly = {
+        {
+                .name           = "addrtype",
+                .family         = NFPROTO_IPV4,
+                .match          = addrtype_mt_v0,
+                .matchsize      = sizeof(struct xt_addrtype_info),
+                .me             = THIS_MODULE
+        },
+        {
+                .name           = "addrtype",
+                .family         = NFPROTO_IPV4,
+                .revision       = 1,
+                .match          = addrtype_mt_v1,
+                .checkentry     = addrtype_mt_checkentry_v1,
+                .matchsize      = sizeof(struct xt_addrtype_info_v1),
+                .me             = THIS_MODULE
+        }
+};
+
+static int __init addrtype_mt_init(void)
+{
+        return xt_register_matches(addrtype_mt_reg,
+                                   ARRAY_SIZE(addrtype_mt_reg));
+}
+
+static void __exit addrtype_mt_exit(void)
+{
+        xt_unregister_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg));
+}
+
+module_init(addrtype_mt_init);
+module_exit(addrtype_mt_exit);