// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ebt_mark
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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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/* The mark target can be used in any chain,
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* I believe adding a mangle table just for marking is total overkill.
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* Marking a frame doesn't really change anything in the frame anyway.
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*/
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#include <linux/module.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_bridge/ebtables.h>
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#include <linux/netfilter_bridge/ebt_mark_t.h>
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static unsigned int
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ebt_mark_tg(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct ebt_mark_t_info *info = par->targinfo;
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int action = info->target & -16;
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if (action == MARK_SET_VALUE)
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skb->mark = info->mark;
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else if (action == MARK_OR_VALUE)
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skb->mark |= info->mark;
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else if (action == MARK_AND_VALUE)
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skb->mark &= info->mark;
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else
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skb->mark ^= info->mark;
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return info->target | ~EBT_VERDICT_BITS;
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}
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static int ebt_mark_tg_check(const struct xt_tgchk_param *par)
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{
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const struct ebt_mark_t_info *info = par->targinfo;
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int tmp;
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tmp = info->target | ~EBT_VERDICT_BITS;
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if (BASE_CHAIN && tmp == EBT_RETURN)
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return -EINVAL;
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if (ebt_invalid_target(tmp))
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return -EINVAL;
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tmp = info->target & ~EBT_VERDICT_BITS;
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if (tmp != MARK_SET_VALUE && tmp != MARK_OR_VALUE &&
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tmp != MARK_AND_VALUE && tmp != MARK_XOR_VALUE)
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return -EINVAL;
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return 0;
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}
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#ifdef CONFIG_COMPAT
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struct compat_ebt_mark_t_info {
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compat_ulong_t mark;
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compat_uint_t target;
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};
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static void mark_tg_compat_from_user(void *dst, const void *src)
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{
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const struct compat_ebt_mark_t_info *user = src;
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struct ebt_mark_t_info *kern = dst;
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kern->mark = user->mark;
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kern->target = user->target;
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}
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static int mark_tg_compat_to_user(void __user *dst, const void *src)
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{
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struct compat_ebt_mark_t_info __user *user = dst;
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const struct ebt_mark_t_info *kern = src;
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if (put_user(kern->mark, &user->mark) ||
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put_user(kern->target, &user->target))
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return -EFAULT;
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return 0;
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}
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#endif
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static struct xt_target ebt_mark_tg_reg __read_mostly = {
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.name = "mark",
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.revision = 0,
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.family = NFPROTO_BRIDGE,
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.target = ebt_mark_tg,
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.checkentry = ebt_mark_tg_check,
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.targetsize = sizeof(struct ebt_mark_t_info),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_ebt_mark_t_info),
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.compat_from_user = mark_tg_compat_from_user,
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.compat_to_user = mark_tg_compat_to_user,
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#endif
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.me = THIS_MODULE,
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};
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static int __init ebt_mark_init(void)
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{
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return xt_register_target(&ebt_mark_tg_reg);
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}
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static void __exit ebt_mark_fini(void)
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{
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xt_unregister_target(&ebt_mark_tg_reg);
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}
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module_init(ebt_mark_init);
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module_exit(ebt_mark_fini);
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MODULE_DESCRIPTION("Ebtables: Packet mark modification");
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MODULE_LICENSE("GPL");
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