Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/nft_queue.c b/kernel/net/netfilter/nft_queue.c
new file mode 100644 (file)
index 0000000..96805d2
--- /dev/null
+++ b/kernel/net/netfilter/nft_queue.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2013 Eric Leblond <eric@regit.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.
+ *
+ * Development of this code partly funded by OISF
+ * (http://www.openinfosecfoundation.org/)
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/jhash.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_queue.h>
+
+static u32 jhash_initval __read_mostly;
+
+struct nft_queue {
+       u16     queuenum;
+       u16     queues_total;
+       u16     flags;
+};
+
+static void nft_queue_eval(const struct nft_expr *expr,
+                          struct nft_regs *regs,
+                          const struct nft_pktinfo *pkt)
+{
+       struct nft_queue *priv = nft_expr_priv(expr);
+       u32 queue = priv->queuenum;
+       u32 ret;
+
+       if (priv->queues_total > 1) {
+               if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) {
+                       int cpu = smp_processor_id();
+
+                       queue = priv->queuenum + cpu % priv->queues_total;
+               } else {
+                       queue = nfqueue_hash(pkt->skb, queue,
+                                            priv->queues_total, pkt->ops->pf,
+                                            jhash_initval);
+               }
+       }
+
+       ret = NF_QUEUE_NR(queue);
+       if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
+               ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
+
+       regs->verdict.code = ret;
+}
+
+static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = {
+       [NFTA_QUEUE_NUM]        = { .type = NLA_U16 },
+       [NFTA_QUEUE_TOTAL]      = { .type = NLA_U16 },
+       [NFTA_QUEUE_FLAGS]      = { .type = NLA_U16 },
+};
+
+static int nft_queue_init(const struct nft_ctx *ctx,
+                          const struct nft_expr *expr,
+                          const struct nlattr * const tb[])
+{
+       struct nft_queue *priv = nft_expr_priv(expr);
+
+       if (tb[NFTA_QUEUE_NUM] == NULL)
+               return -EINVAL;
+
+       init_hashrandom(&jhash_initval);
+       priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM]));
+
+       if (tb[NFTA_QUEUE_TOTAL] != NULL)
+               priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL]));
+       if (tb[NFTA_QUEUE_FLAGS] != NULL) {
+               priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
+               if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
+                       return -EINVAL;
+       }
+       return 0;
+}
+
+static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+       const struct nft_queue *priv = nft_expr_priv(expr);
+
+       if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) ||
+           nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) ||
+           nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
+               goto nla_put_failure;
+
+       return 0;
+
+nla_put_failure:
+       return -1;
+}
+
+static struct nft_expr_type nft_queue_type;
+static const struct nft_expr_ops nft_queue_ops = {
+       .type           = &nft_queue_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
+       .eval           = nft_queue_eval,
+       .init           = nft_queue_init,
+       .dump           = nft_queue_dump,
+};
+
+static struct nft_expr_type nft_queue_type __read_mostly = {
+       .name           = "queue",
+       .ops            = &nft_queue_ops,
+       .policy         = nft_queue_policy,
+       .maxattr        = NFTA_QUEUE_MAX,
+       .owner          = THIS_MODULE,
+};
+
+static int __init nft_queue_module_init(void)
+{
+       return nft_register_expr(&nft_queue_type);
+}
+
+static void __exit nft_queue_module_exit(void)
+{
+       nft_unregister_expr(&nft_queue_type);
+}
+
+module_init(nft_queue_module_init);
+module_exit(nft_queue_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Eric Leblond <eric@regit.org>");
+MODULE_ALIAS_NFT_EXPR("queue");