Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_NFQUEUE.c

diff --git a/kernel/net/netfilter/xt_NFQUEUE.c b/kernel/net/netfilter/xt_NFQUEUE.c
new file mode 100644 (file)
index 0000000..8f1779f
--- /dev/null
+++ b/kernel/net/netfilter/xt_NFQUEUE.c
@@ -0,0 +1,160 @@
+/* iptables module for using new netfilter netlink queue
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_arp.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_NFQUEUE.h>
+
+#include <net/netfilter/nf_queue.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: packet forwarding to netlink");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_NFQUEUE");
+MODULE_ALIAS("ip6t_NFQUEUE");
+MODULE_ALIAS("arpt_NFQUEUE");
+
+static u32 jhash_initval __read_mostly;
+
+static unsigned int
+nfqueue_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_NFQ_info *tinfo = par->targinfo;
+
+       return NF_QUEUE_NR(tinfo->queuenum);
+}
+
+static unsigned int
+nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_NFQ_info_v1 *info = par->targinfo;
+       u32 queue = info->queuenum;
+
+       if (info->queues_total > 1) {
+               queue = nfqueue_hash(skb, queue, info->queues_total,
+                                    par->family, jhash_initval);
+       }
+       return NF_QUEUE_NR(queue);
+}
+
+static unsigned int
+nfqueue_tg_v2(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_NFQ_info_v2 *info = par->targinfo;
+       unsigned int ret = nfqueue_tg_v1(skb, par);
+
+       if (info->bypass)
+               ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
+       return ret;
+}
+
+static int nfqueue_tg_check(const struct xt_tgchk_param *par)
+{
+       const struct xt_NFQ_info_v3 *info = par->targinfo;
+       u32 maxid;
+
+       init_hashrandom(&jhash_initval);
+
+       if (info->queues_total == 0) {
+               pr_err("NFQUEUE: number of total queues is 0\n");
+               return -EINVAL;
+       }
+       maxid = info->queues_total - 1 + info->queuenum;
+       if (maxid > 0xffff) {
+               pr_err("NFQUEUE: number of queues (%u) out of range (got %u)\n",
+                      info->queues_total, maxid);
+               return -ERANGE;
+       }
+       if (par->target->revision == 2 && info->flags > 1)
+               return -EINVAL;
+       if (par->target->revision == 3 && info->flags & ~NFQ_FLAG_MASK)
+               return -EINVAL;
+
+       return 0;
+}
+
+static unsigned int
+nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_NFQ_info_v3 *info = par->targinfo;
+       u32 queue = info->queuenum;
+       int ret;
+
+       if (info->queues_total > 1) {
+               if (info->flags & NFQ_FLAG_CPU_FANOUT) {
+                       int cpu = smp_processor_id();
+
+                       queue = info->queuenum + cpu % info->queues_total;
+               } else {
+                       queue = nfqueue_hash(skb, queue, info->queues_total,
+                                            par->family, jhash_initval);
+               }
+       }
+
+       ret = NF_QUEUE_NR(queue);
+       if (info->flags & NFQ_FLAG_BYPASS)
+               ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
+
+       return ret;
+}
+
+static struct xt_target nfqueue_tg_reg[] __read_mostly = {
+       {
+               .name           = "NFQUEUE",
+               .family         = NFPROTO_UNSPEC,
+               .target         = nfqueue_tg,
+               .targetsize     = sizeof(struct xt_NFQ_info),
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "NFQUEUE",
+               .revision       = 1,
+               .family         = NFPROTO_UNSPEC,
+               .checkentry     = nfqueue_tg_check,
+               .target         = nfqueue_tg_v1,
+               .targetsize     = sizeof(struct xt_NFQ_info_v1),
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "NFQUEUE",
+               .revision       = 2,
+               .family         = NFPROTO_UNSPEC,
+               .checkentry     = nfqueue_tg_check,
+               .target         = nfqueue_tg_v2,
+               .targetsize     = sizeof(struct xt_NFQ_info_v2),
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "NFQUEUE",
+               .revision       = 3,
+               .family         = NFPROTO_UNSPEC,
+               .checkentry     = nfqueue_tg_check,
+               .target         = nfqueue_tg_v3,
+               .targetsize     = sizeof(struct xt_NFQ_info_v3),
+               .me             = THIS_MODULE,
+       },
+};
+
+static int __init nfqueue_tg_init(void)
+{
+       return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
+}
+
+static void __exit nfqueue_tg_exit(void)
+{
+       xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
+}
+
+module_init(nfqueue_tg_init);
+module_exit(nfqueue_tg_exit);