diff options
Diffstat (limited to 'net/netfilter/nft_log.c')
| -rw-r--r-- | net/netfilter/nft_log.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/net/netfilter/nft_log.c b/net/netfilter/nft_log.c new file mode 100644 index 000000000000..57cad072a13e --- /dev/null +++ b/net/netfilter/nft_log.c @@ -0,0 +1,146 @@ +/* + * Copyright (c) 2008-2009 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_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"); |