mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
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115 lines
3.2 KiB
C
115 lines
3.2 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/version.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 const struct net_device *iface_get(const struct xt_iface_mtinfo *info,
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const struct xt_action_param *par, struct net_device **put)
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{
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if (info->flags & XT_IFACE_DEV_IN)
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return par->state->in;
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else if (info->flags & XT_IFACE_DEV_OUT)
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return par->state->out;
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return *put = dev_get_by_name(&init_net, info->ifname);
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}
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static bool iface_flagtest(unsigned int devflags, unsigned int flags,
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unsigned int invflags)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(xt_iface_lookup); ++i)
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if ((flags & xt_iface_lookup[i].iface_flag) &&
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!!(devflags & xt_iface_lookup[i].iff_flag) ^
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!(invflags & xt_iface_lookup[i].iface_flag))
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return false;
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return true;
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}
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static bool xt_iface_mt(const struct sk_buff *skb,
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struct xt_action_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 *put = NULL;
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const struct net_device *dev = iface_get(info, par, &put);
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bool retval;
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if (dev == NULL)
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return false;
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retval = iface_flagtest(dev->flags, info->flags, info->invflags);
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if (put != NULL)
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dev_put(put);
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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 = 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 = 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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