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- /*
- * ebt_mark_m
- *
- * Authors:
- * Bart De Schuymer <bdschuym@pandora.be>
- *
- * July, 2002
- *
- */
- #include <linux/module.h>
- #include <linux/netfilter/x_tables.h>
- #include <linux/netfilter_bridge/ebtables.h>
- #include <linux/netfilter_bridge/ebt_mark_m.h>
- static bool
- ebt_mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
- {
- const struct ebt_mark_m_info *info = par->matchinfo;
- if (info->bitmask & EBT_MARK_OR)
- return !!(skb->mark & info->mask) ^ info->invert;
- return ((skb->mark & info->mask) == info->mark) ^ info->invert;
- }
- static int ebt_mark_mt_check(const struct xt_mtchk_param *par)
- {
- const struct ebt_mark_m_info *info = par->matchinfo;
- if (info->bitmask & ~EBT_MARK_MASK)
- return -EINVAL;
- if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
- return -EINVAL;
- if (!info->bitmask)
- return -EINVAL;
- return 0;
- }
- #ifdef CONFIG_COMPAT
- struct compat_ebt_mark_m_info {
- compat_ulong_t mark, mask;
- uint8_t invert, bitmask;
- };
- static void mark_mt_compat_from_user(void *dst, const void *src)
- {
- const struct compat_ebt_mark_m_info *user = src;
- struct ebt_mark_m_info *kern = dst;
- kern->mark = user->mark;
- kern->mask = user->mask;
- kern->invert = user->invert;
- kern->bitmask = user->bitmask;
- }
- static int mark_mt_compat_to_user(void __user *dst, const void *src)
- {
- struct compat_ebt_mark_m_info __user *user = dst;
- const struct ebt_mark_m_info *kern = src;
- if (put_user(kern->mark, &user->mark) ||
- put_user(kern->mask, &user->mask) ||
- put_user(kern->invert, &user->invert) ||
- put_user(kern->bitmask, &user->bitmask))
- return -EFAULT;
- return 0;
- }
- #endif
- static struct xt_match ebt_mark_mt_reg __read_mostly = {
- .name = "mark_m",
- .revision = 0,
- .family = NFPROTO_BRIDGE,
- .match = ebt_mark_mt,
- .checkentry = ebt_mark_mt_check,
- .matchsize = sizeof(struct ebt_mark_m_info),
- #ifdef CONFIG_COMPAT
- .compatsize = sizeof(struct compat_ebt_mark_m_info),
- .compat_from_user = mark_mt_compat_from_user,
- .compat_to_user = mark_mt_compat_to_user,
- #endif
- .me = THIS_MODULE,
- };
- static int __init ebt_mark_m_init(void)
- {
- return xt_register_match(&ebt_mark_mt_reg);
- }
- static void __exit ebt_mark_m_fini(void)
- {
- xt_unregister_match(&ebt_mark_mt_reg);
- }
- module_init(ebt_mark_m_init);
- module_exit(ebt_mark_m_fini);
- MODULE_DESCRIPTION("Ebtables: Packet mark match");
- MODULE_LICENSE("GPL");
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