62472bcefb
In order to fix set destruction notifications and get rid of unnecessary members in private data structures, pass the context to expressions' destructor functions again. In order to do so, replace various members in the nft_rule_trans structure by the full context. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_log.h>
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#include <linux/netdevice.h>
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static const char *nft_log_null_prefix = "";
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struct nft_log {
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struct nf_loginfo loginfo;
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char *prefix;
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};
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static void nft_log_eval(const struct nft_expr *expr,
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struct nft_data data[NFT_REG_MAX + 1],
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const struct nft_pktinfo *pkt)
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{
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const struct nft_log *priv = nft_expr_priv(expr);
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struct net *net = dev_net(pkt->in ? pkt->in : pkt->out);
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nf_log_packet(net, pkt->ops->pf, pkt->ops->hooknum, pkt->skb, pkt->in,
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pkt->out, &priv->loginfo, "%s", priv->prefix);
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}
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static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = {
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[NFTA_LOG_GROUP] = { .type = NLA_U16 },
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[NFTA_LOG_PREFIX] = { .type = NLA_STRING },
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[NFTA_LOG_SNAPLEN] = { .type = NLA_U32 },
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[NFTA_LOG_QTHRESHOLD] = { .type = NLA_U16 },
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};
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static int nft_log_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_log *priv = nft_expr_priv(expr);
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struct nf_loginfo *li = &priv->loginfo;
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const struct nlattr *nla;
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nla = tb[NFTA_LOG_PREFIX];
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if (nla != NULL) {
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priv->prefix = kmalloc(nla_len(nla) + 1, GFP_KERNEL);
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if (priv->prefix == NULL)
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return -ENOMEM;
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nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1);
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} else
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priv->prefix = (char *)nft_log_null_prefix;
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li->type = NF_LOG_TYPE_ULOG;
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if (tb[NFTA_LOG_GROUP] != NULL)
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li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP]));
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if (tb[NFTA_LOG_SNAPLEN] != NULL)
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li->u.ulog.copy_len = ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN]));
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if (tb[NFTA_LOG_QTHRESHOLD] != NULL) {
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li->u.ulog.qthreshold =
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ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD]));
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}
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return 0;
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}
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static void nft_log_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_log *priv = nft_expr_priv(expr);
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if (priv->prefix != nft_log_null_prefix)
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kfree(priv->prefix);
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}
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static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_log *priv = nft_expr_priv(expr);
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const struct nf_loginfo *li = &priv->loginfo;
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if (priv->prefix != nft_log_null_prefix)
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if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix))
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goto nla_put_failure;
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if (li->u.ulog.group)
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if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group)))
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goto nla_put_failure;
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if (li->u.ulog.copy_len)
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if (nla_put_be32(skb, NFTA_LOG_SNAPLEN,
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htonl(li->u.ulog.copy_len)))
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goto nla_put_failure;
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if (li->u.ulog.qthreshold)
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if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD,
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htons(li->u.ulog.qthreshold)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct nft_expr_type nft_log_type;
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static const struct nft_expr_ops nft_log_ops = {
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.type = &nft_log_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_log)),
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.eval = nft_log_eval,
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.init = nft_log_init,
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.destroy = nft_log_destroy,
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.dump = nft_log_dump,
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};
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static struct nft_expr_type nft_log_type __read_mostly = {
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.name = "log",
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.ops = &nft_log_ops,
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.policy = nft_log_policy,
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.maxattr = NFTA_LOG_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_log_module_init(void)
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{
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return nft_register_expr(&nft_log_type);
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}
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static void __exit nft_log_module_exit(void)
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{
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nft_unregister_expr(&nft_log_type);
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}
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module_init(nft_log_module_init);
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module_exit(nft_log_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_EXPR("log");
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