--- /dev/null
+/*
+ * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
+ * Copyright (c) 2012-2014 Pablo Neira Ayuso <pablo@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.
+ *
+ * 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;
+};
+
+static void nft_log_eval(const struct nft_expr *expr,
+ struct nft_regs *regs,
+ 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, pkt->ops->pf, pkt->ops->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 },
+ [NFTA_LOG_LEVEL] = { .type = NLA_U32 },
+ [NFTA_LOG_FLAGS] = { .type = NLA_U32 },
+};
+
+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;
+ int ret;
+
+ 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_LOG;
+ if (tb[NFTA_LOG_LEVEL] != NULL &&
+ tb[NFTA_LOG_GROUP] != NULL)
+ return -EINVAL;
+ if (tb[NFTA_LOG_GROUP] != NULL)
+ li->type = NF_LOG_TYPE_ULOG;
+
+ switch (li->type) {
+ case NF_LOG_TYPE_LOG:
+ if (tb[NFTA_LOG_LEVEL] != NULL) {
+ li->u.log.level =
+ ntohl(nla_get_be32(tb[NFTA_LOG_LEVEL]));
+ } else {
+ li->u.log.level = LOGLEVEL_WARNING;
+ }
+ if (tb[NFTA_LOG_FLAGS] != NULL) {
+ li->u.log.logflags =
+ ntohl(nla_get_be32(tb[NFTA_LOG_FLAGS]));
+ }
+ break;
+ case NF_LOG_TYPE_ULOG:
+ 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]));
+ }
+ break;
+ }
+
+ if (ctx->afi->family == NFPROTO_INET) {
+ ret = nf_logger_find_get(NFPROTO_IPV4, li->type);
+ if (ret < 0)
+ return ret;
+
+ ret = nf_logger_find_get(NFPROTO_IPV6, li->type);
+ if (ret < 0) {
+ nf_logger_put(NFPROTO_IPV4, li->type);
+ return ret;
+ }
+ return 0;
+ }
+
+ return nf_logger_find_get(ctx->afi->family, li->type);
+}
+
+static void nft_log_destroy(const struct nft_ctx *ctx,
+ const struct nft_expr *expr)
+{
+ struct nft_log *priv = nft_expr_priv(expr);
+ struct nf_loginfo *li = &priv->loginfo;
+
+ if (priv->prefix != nft_log_null_prefix)
+ kfree(priv->prefix);
+
+ if (ctx->afi->family == NFPROTO_INET) {
+ nf_logger_put(NFPROTO_IPV4, li->type);
+ nf_logger_put(NFPROTO_IPV6, li->type);
+ } else {
+ nf_logger_put(ctx->afi->family, li->type);
+ }
+}
+
+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;
+ switch (li->type) {
+ case NF_LOG_TYPE_LOG:
+ if (nla_put_be32(skb, NFTA_LOG_LEVEL, htonl(li->u.log.level)))
+ goto nla_put_failure;
+
+ if (li->u.log.logflags) {
+ if (nla_put_be32(skb, NFTA_LOG_FLAGS,
+ htonl(li->u.log.logflags)))
+ goto nla_put_failure;
+ }
+ break;
+ case NF_LOG_TYPE_ULOG:
+ 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;
+ }
+ break;
+ }
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+static struct nft_expr_type nft_log_type;
+static const struct nft_expr_ops nft_log_ops = {
+ .type = &nft_log_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_log)),
+ .eval = nft_log_eval,
+ .init = nft_log_init,
+ .destroy = nft_log_destroy,
+ .dump = nft_log_dump,
+};
+
+static struct nft_expr_type nft_log_type __read_mostly = {
+ .name = "log",
+ .ops = &nft_log_ops,
+ .policy = nft_log_policy,
+ .maxattr = NFTA_LOG_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_log_module_init(void)
+{
+ return nft_register_expr(&nft_log_type);
+}
+
+static void __exit nft_log_module_exit(void)
+{
+ nft_unregister_expr(&nft_log_type);
+}
+
+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");
Code Review / kvmfornfv.git / blobdiff