mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
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39655fe83b
Need to include compat_xtables.h to get all the definitions for older kernels. Also, net namespaces are not available before 2.6.24.
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/*
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* xt_iface - kernel module to match interface state flags
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*
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* Original author: Gáspár Lajos <gaspar.lajos@glsys.eu>
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*/
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#include <linux/if.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter/x_tables.h>
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#include "xt_iface.h"
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#include "compat_xtables.h"
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struct xt_iface_flag_pairs {
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uint16_t iface_flag;
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uint32_t iff_flag;
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};
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MODULE_AUTHOR("Gáspár Lajos <gaspar.lajos@glsys.eu>");
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MODULE_DESCRIPTION("Xtables: iface match module");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_iface");
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MODULE_ALIAS("ip6t_iface");
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//MODULE_ALIAS("arpt_iface");
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static const struct xt_iface_flag_pairs xt_iface_lookup[] =
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{
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{.iface_flag = XT_IFACE_UP, .iff_flag = IFF_UP},
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{.iface_flag = XT_IFACE_BROADCAST, .iff_flag = IFF_BROADCAST},
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{.iface_flag = XT_IFACE_LOOPBACK, .iff_flag = IFF_LOOPBACK},
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{.iface_flag = XT_IFACE_POINTOPOINT, .iff_flag = IFF_POINTOPOINT},
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{.iface_flag = XT_IFACE_RUNNING, .iff_flag = IFF_RUNNING},
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{.iface_flag = XT_IFACE_NOARP, .iff_flag = IFF_NOARP},
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{.iface_flag = XT_IFACE_PROMISC, .iff_flag = IFF_PROMISC},
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{.iface_flag = XT_IFACE_MULTICAST, .iff_flag = IFF_MULTICAST},
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{.iface_flag = XT_IFACE_DYNAMIC, .iff_flag = IFF_DYNAMIC},
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{.iface_flag = XT_IFACE_LOWER_UP, .iff_flag = IFF_LOWER_UP},
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{.iface_flag = XT_IFACE_DORMANT, .iff_flag = IFF_DORMANT},
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};
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static bool xt_iface_mt(const struct sk_buff *skb,
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const struct xt_match_param *par)
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{
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const struct xt_iface_mtinfo *info = par->matchinfo;
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struct net_device *dev;
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bool retval;
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int i;
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
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dev = dev_get_by_name(&init_net, info->ifname);
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#else
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dev = dev_get_by_name(info->ifname);
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#endif
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retval = dev != NULL;
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if (retval) {
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for (i = 0; i < ARRAY_SIZE(xt_iface_lookup) && retval; ++i) {
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if (info->flags & xt_iface_lookup[i].iface_flag)
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retval &= dev->flags & xt_iface_lookup[i].iff_flag;
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if (info->invflags & xt_iface_lookup[i].iface_flag)
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retval &= !(dev->flags & xt_iface_lookup[i].iff_flag);
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}
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dev_put(dev);
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}
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return retval;
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}
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static struct xt_match xt_iface_mt_reg[] __read_mostly = {
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{
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.name = "iface",
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.revision = 0,
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.family = NFPROTO_IPV4,
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.matchsize = XT_ALIGN(sizeof(struct xt_iface_mtinfo)),
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.match = xt_iface_mt,
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.me = THIS_MODULE,
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},
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{
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.name = "iface",
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.revision = 0,
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.family = NFPROTO_IPV6,
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.matchsize = XT_ALIGN(sizeof(struct xt_iface_mtinfo)),
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.match = xt_iface_mt,
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.me = THIS_MODULE,
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},
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};
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static int __init xt_iface_match_init(void)
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{
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return xt_register_matches(xt_iface_mt_reg,
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ARRAY_SIZE(xt_iface_mt_reg));
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}
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static void __exit xt_iface_match_exit(void)
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{
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xt_unregister_matches(xt_iface_mt_reg, ARRAY_SIZE(xt_iface_mt_reg));
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}
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module_init(xt_iface_match_init);
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module_exit(xt_iface_match_exit);
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