netfilter: add nftables

[karo-tx-linux.git] / net / netfilter / nft_log.c

diff --git a/net/netfilter/nft_log.c b/net/netfilter/nft_log.c
new file mode 100644 (file)
index 0000000..da495c3
--- /dev/null
+++ b/net/netfilter/nft_log.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ *
+ * 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 funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_log.h>
+#include <linux/netdevice.h>
+
+static const char *nft_log_null_prefix = "";
+
+struct nft_log {
+       struct nf_loginfo       loginfo;
+       char                    *prefix;
+       int                     family;
+};
+
+static void nft_log_eval(const struct nft_expr *expr,
+                        struct nft_data data[NFT_REG_MAX + 1],
+                        const struct nft_pktinfo *pkt)
+{
+       const struct nft_log *priv = nft_expr_priv(expr);
+       struct net *net = dev_net(pkt->in ? pkt->in : pkt->out);
+
+       nf_log_packet(net, priv->family, pkt->hooknum, pkt->skb, pkt->in,
+                     pkt->out, &priv->loginfo, "%s", priv->prefix);
+}
+
+static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = {
+       [NFTA_LOG_GROUP]        = { .type = NLA_U16 },
+       [NFTA_LOG_PREFIX]       = { .type = NLA_STRING },
+       [NFTA_LOG_SNAPLEN]      = { .type = NLA_U32 },
+       [NFTA_LOG_QTHRESHOLD]   = { .type = NLA_U16 },
+};
+
+static int nft_log_init(const struct nft_ctx *ctx,
+                       const struct nft_expr *expr,
+                       const struct nlattr * const tb[])
+{
+       struct nft_log *priv = nft_expr_priv(expr);
+       struct nf_loginfo *li = &priv->loginfo;
+       const struct nlattr *nla;
+
+       priv->family = ctx->afi->family;
+
+       nla = tb[NFTA_LOG_PREFIX];
+       if (nla != NULL) {
+               priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL);
+               if (priv->prefix == NULL)
+                       return -ENOMEM;
+               nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1);
+       } else
+               priv->prefix = (char *)nft_log_null_prefix;
+
+       li->type = NF_LOG_TYPE_ULOG;
+       if (tb[NFTA_LOG_GROUP] != NULL)
+               li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP]));
+
+       if (tb[NFTA_LOG_SNAPLEN] != NULL)
+               li->u.ulog.copy_len = ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN]));
+       if (tb[NFTA_LOG_QTHRESHOLD] != NULL) {
+               li->u.ulog.qthreshold =
+                       ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD]));
+       }
+
+       return 0;
+}
+
+static void nft_log_destroy(const struct nft_expr *expr)
+{
+       struct nft_log *priv = nft_expr_priv(expr);
+
+       if (priv->prefix != nft_log_null_prefix)
+               kfree(priv->prefix);
+}
+
+static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+       const struct nft_log *priv = nft_expr_priv(expr);
+       const struct nf_loginfo *li = &priv->loginfo;
+
+       if (priv->prefix != nft_log_null_prefix)
+               if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix))
+                       goto nla_put_failure;
+       if (li->u.ulog.group)
+               if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group)))
+                       goto nla_put_failure;
+       if (li->u.ulog.copy_len)
+               if (nla_put_be32(skb, NFTA_LOG_SNAPLEN,
+                                htonl(li->u.ulog.copy_len)))
+                       goto nla_put_failure;
+       if (li->u.ulog.qthreshold)
+               if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD,
+                                htons(li->u.ulog.qthreshold)))
+                       goto nla_put_failure;
+       return 0;
+
+nla_put_failure:
+       return -1;
+}
+
+static struct nft_expr_ops nft_log_ops __read_mostly = {
+       .name           = "log",
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_log)),
+       .owner          = THIS_MODULE,
+       .eval           = nft_log_eval,
+       .init           = nft_log_init,
+       .destroy        = nft_log_destroy,
+       .dump           = nft_log_dump,
+       .policy         = nft_log_policy,
+       .maxattr        = NFTA_LOG_MAX,
+};
+
+static int __init nft_log_module_init(void)
+{
+       return nft_register_expr(&nft_log_ops);
+}
+
+static void __exit nft_log_module_exit(void)
+{
+       nft_unregister_expr(&nft_log_ops);
+}
+
+module_init(nft_log_module_init);
+module_exit(nft_log_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_ALIAS_NFT_EXPR("log");