Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / bridge / netfilter / ebt_mark.c

diff --git a/kernel/net/bridge/netfilter/ebt_mark.c b/kernel/net/bridge/netfilter/ebt_mark.c
new file mode 100644 (file)
index 0000000..66697cb
--- /dev/null
+++ b/kernel/net/bridge/netfilter/ebt_mark.c
@@ -0,0 +1,110 @@
+/*
+ *  ebt_mark
+ *
+ *     Authors:
+ *     Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  July, 2002
+ *
+ */
+
+/* The mark target can be used in any chain,
+ * I believe adding a mangle table just for marking is total overkill.
+ * Marking a frame doesn't really change anything in the frame anyway.
+ */
+
+#include <linux/module.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_mark_t.h>
+
+static unsigned int
+ebt_mark_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct ebt_mark_t_info *info = par->targinfo;
+       int action = info->target & -16;
+
+       if (action == MARK_SET_VALUE)
+               skb->mark = info->mark;
+       else if (action == MARK_OR_VALUE)
+               skb->mark |= info->mark;
+       else if (action == MARK_AND_VALUE)
+               skb->mark &= info->mark;
+       else
+               skb->mark ^= info->mark;
+
+       return info->target | ~EBT_VERDICT_BITS;
+}
+
+static int ebt_mark_tg_check(const struct xt_tgchk_param *par)
+{
+       const struct ebt_mark_t_info *info = par->targinfo;
+       int tmp;
+
+       tmp = info->target | ~EBT_VERDICT_BITS;
+       if (BASE_CHAIN && tmp == EBT_RETURN)
+               return -EINVAL;
+       if (tmp < -NUM_STANDARD_TARGETS || tmp >= 0)
+               return -EINVAL;
+       tmp = info->target & ~EBT_VERDICT_BITS;
+       if (tmp != MARK_SET_VALUE && tmp != MARK_OR_VALUE &&
+           tmp != MARK_AND_VALUE && tmp != MARK_XOR_VALUE)
+               return -EINVAL;
+       return 0;
+}
+#ifdef CONFIG_COMPAT
+struct compat_ebt_mark_t_info {
+       compat_ulong_t mark;
+       compat_uint_t target;
+};
+
+static void mark_tg_compat_from_user(void *dst, const void *src)
+{
+       const struct compat_ebt_mark_t_info *user = src;
+       struct ebt_mark_t_info *kern = dst;
+
+       kern->mark = user->mark;
+       kern->target = user->target;
+}
+
+static int mark_tg_compat_to_user(void __user *dst, const void *src)
+{
+       struct compat_ebt_mark_t_info __user *user = dst;
+       const struct ebt_mark_t_info *kern = src;
+
+       if (put_user(kern->mark, &user->mark) ||
+           put_user(kern->target, &user->target))
+               return -EFAULT;
+       return 0;
+}
+#endif
+
+static struct xt_target ebt_mark_tg_reg __read_mostly = {
+       .name           = "mark",
+       .revision       = 0,
+       .family         = NFPROTO_BRIDGE,
+       .target         = ebt_mark_tg,
+       .checkentry     = ebt_mark_tg_check,
+       .targetsize     = sizeof(struct ebt_mark_t_info),
+#ifdef CONFIG_COMPAT
+       .compatsize     = sizeof(struct compat_ebt_mark_t_info),
+       .compat_from_user = mark_tg_compat_from_user,
+       .compat_to_user = mark_tg_compat_to_user,
+#endif
+       .me             = THIS_MODULE,
+};
+
+static int __init ebt_mark_init(void)
+{
+       return xt_register_target(&ebt_mark_tg_reg);
+}
+
+static void __exit ebt_mark_fini(void)
+{
+       xt_unregister_target(&ebt_mark_tg_reg);
+}
+
+module_init(ebt_mark_init);
+module_exit(ebt_mark_fini);
+MODULE_DESCRIPTION("Ebtables: Packet mark modification");
+MODULE_LICENSE("GPL");