63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
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* ebt_mark_m
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*
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* Authors:
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* Bart De Schuymer <bdschuym@pandora.be>
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*
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* July, 2002
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*
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*/
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#include <linux/netfilter_bridge/ebtables.h>
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#include <linux/netfilter_bridge/ebt_mark_m.h>
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#include <linux/module.h>
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static int ebt_filter_mark(const struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out, const void *data,
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unsigned int datalen)
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{
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struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
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if (info->bitmask & EBT_MARK_OR)
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return !(!!(skb->mark & info->mask) ^ info->invert);
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return !(((skb->mark & info->mask) == info->mark) ^ info->invert);
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}
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static int ebt_mark_check(const char *tablename, unsigned int hookmask,
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const struct ebt_entry *e, void *data, unsigned int datalen)
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{
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struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
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if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_m_info)))
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return -EINVAL;
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if (info->bitmask & ~EBT_MARK_MASK)
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return -EINVAL;
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if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
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return -EINVAL;
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if (!info->bitmask)
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return -EINVAL;
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return 0;
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}
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static struct ebt_match filter_mark =
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{
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.name = EBT_MARK_MATCH,
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.match = ebt_filter_mark,
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.check = ebt_mark_check,
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.me = THIS_MODULE,
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};
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static int __init ebt_mark_m_init(void)
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{
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return ebt_register_match(&filter_mark);
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}
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static void __exit ebt_mark_m_fini(void)
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{
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ebt_unregister_match(&filter_mark);
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}
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module_init(ebt_mark_m_init);
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module_exit(ebt_mark_m_fini);
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MODULE_LICENSE("GPL");
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