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Linux/net/bridge/netfilter/ebt_mark_m.c

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  1 /*
  2  *  ebt_mark_m
  3  *
  4  *      Authors:
  5  *      Bart De Schuymer <bdschuym@pandora.be>
  6  *
  7  *  July, 2002
  8  *
  9  */
 10 #include <linux/module.h>
 11 #include <linux/netfilter/x_tables.h>
 12 #include <linux/netfilter_bridge/ebtables.h>
 13 #include <linux/netfilter_bridge/ebt_mark_m.h>
 14 
 15 static bool
 16 ebt_mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
 17 {
 18         const struct ebt_mark_m_info *info = par->matchinfo;
 19 
 20         if (info->bitmask & EBT_MARK_OR)
 21                 return !!(skb->mark & info->mask) ^ info->invert;
 22         return ((skb->mark & info->mask) == info->mark) ^ info->invert;
 23 }
 24 
 25 static int ebt_mark_mt_check(const struct xt_mtchk_param *par)
 26 {
 27         const struct ebt_mark_m_info *info = par->matchinfo;
 28 
 29         if (info->bitmask & ~EBT_MARK_MASK)
 30                 return -EINVAL;
 31         if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
 32                 return -EINVAL;
 33         if (!info->bitmask)
 34                 return -EINVAL;
 35         return 0;
 36 }
 37 
 38 
 39 #ifdef CONFIG_COMPAT
 40 struct compat_ebt_mark_m_info {
 41         compat_ulong_t mark, mask;
 42         uint8_t invert, bitmask;
 43 };
 44 
 45 static void mark_mt_compat_from_user(void *dst, const void *src)
 46 {
 47         const struct compat_ebt_mark_m_info *user = src;
 48         struct ebt_mark_m_info *kern = dst;
 49 
 50         kern->mark = user->mark;
 51         kern->mask = user->mask;
 52         kern->invert = user->invert;
 53         kern->bitmask = user->bitmask;
 54 }
 55 
 56 static int mark_mt_compat_to_user(void __user *dst, const void *src)
 57 {
 58         struct compat_ebt_mark_m_info __user *user = dst;
 59         const struct ebt_mark_m_info *kern = src;
 60 
 61         if (put_user(kern->mark, &user->mark) ||
 62             put_user(kern->mask, &user->mask) ||
 63             put_user(kern->invert, &user->invert) ||
 64             put_user(kern->bitmask, &user->bitmask))
 65                 return -EFAULT;
 66         return 0;
 67 }
 68 #endif
 69 
 70 static struct xt_match ebt_mark_mt_reg __read_mostly = {
 71         .name           = "mark_m",
 72         .revision       = 0,
 73         .family         = NFPROTO_BRIDGE,
 74         .match          = ebt_mark_mt,
 75         .checkentry     = ebt_mark_mt_check,
 76         .matchsize      = sizeof(struct ebt_mark_m_info),
 77 #ifdef CONFIG_COMPAT
 78         .compatsize     = sizeof(struct compat_ebt_mark_m_info),
 79         .compat_from_user = mark_mt_compat_from_user,
 80         .compat_to_user = mark_mt_compat_to_user,
 81 #endif
 82         .me             = THIS_MODULE,
 83 };
 84 
 85 static int __init ebt_mark_m_init(void)
 86 {
 87         return xt_register_match(&ebt_mark_mt_reg);
 88 }
 89 
 90 static void __exit ebt_mark_m_fini(void)
 91 {
 92         xt_unregister_match(&ebt_mark_mt_reg);
 93 }
 94 
 95 module_init(ebt_mark_m_init);
 96 module_exit(ebt_mark_m_fini);
 97 MODULE_DESCRIPTION("Ebtables: Packet mark match");
 98 MODULE_LICENSE("GPL");
 99 

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