![Gao Feng](/assets/img/avatar_default.png)
There are some codes of netfilter module which did not check the return value of nft_register_chain_type. Add the checks now. Signed-off-by: Gao Feng <fgao@ikuai8.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
186 lines
4.3 KiB
C
186 lines
4.3 KiB
C
/*
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* Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
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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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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <net/netfilter/nf_tables.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <net/netfilter/nf_tables_ipv4.h>
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#include <net/netfilter/nf_tables_ipv6.h>
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static unsigned int
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nft_do_chain_netdev(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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struct nft_pktinfo pkt;
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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nft_set_pktinfo_ipv4_validate(&pkt, skb, state);
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break;
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case htons(ETH_P_IPV6):
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nft_set_pktinfo_ipv6_validate(&pkt, skb, state);
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break;
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default:
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nft_set_pktinfo_unspec(&pkt, skb, state);
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break;
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}
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return nft_do_chain(&pkt, priv);
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}
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static struct nft_af_info nft_af_netdev __read_mostly = {
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.family = NFPROTO_NETDEV,
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.nhooks = NF_NETDEV_NUMHOOKS,
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.owner = THIS_MODULE,
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.flags = NFT_AF_NEEDS_DEV,
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.nops = 1,
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.hooks = {
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[NF_NETDEV_INGRESS] = nft_do_chain_netdev,
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},
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};
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static int nf_tables_netdev_init_net(struct net *net)
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{
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net->nft.netdev = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
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if (net->nft.netdev == NULL)
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return -ENOMEM;
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memcpy(net->nft.netdev, &nft_af_netdev, sizeof(nft_af_netdev));
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if (nft_register_afinfo(net, net->nft.netdev) < 0)
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goto err;
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return 0;
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err:
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kfree(net->nft.netdev);
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return -ENOMEM;
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}
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static void nf_tables_netdev_exit_net(struct net *net)
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{
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nft_unregister_afinfo(net, net->nft.netdev);
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kfree(net->nft.netdev);
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}
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static struct pernet_operations nf_tables_netdev_net_ops = {
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.init = nf_tables_netdev_init_net,
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.exit = nf_tables_netdev_exit_net,
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};
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static const struct nf_chain_type nft_filter_chain_netdev = {
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.name = "filter",
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.type = NFT_CHAIN_T_DEFAULT,
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.family = NFPROTO_NETDEV,
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.owner = THIS_MODULE,
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.hook_mask = (1 << NF_NETDEV_INGRESS),
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};
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static void nft_netdev_event(unsigned long event, struct net_device *dev,
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struct nft_ctx *ctx)
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{
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struct nft_base_chain *basechain = nft_base_chain(ctx->chain);
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switch (event) {
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case NETDEV_UNREGISTER:
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if (strcmp(basechain->dev_name, dev->name) != 0)
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return;
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__nft_release_basechain(ctx);
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break;
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case NETDEV_CHANGENAME:
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if (dev->ifindex != basechain->ops[0].dev->ifindex)
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return;
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strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
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break;
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}
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}
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static int nf_tables_netdev_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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struct nft_af_info *afi;
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struct nft_table *table;
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struct nft_chain *chain, *nr;
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struct nft_ctx ctx = {
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.net = dev_net(dev),
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};
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if (event != NETDEV_UNREGISTER &&
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event != NETDEV_CHANGENAME)
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return NOTIFY_DONE;
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nfnl_lock(NFNL_SUBSYS_NFTABLES);
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list_for_each_entry(afi, &dev_net(dev)->nft.af_info, list) {
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ctx.afi = afi;
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if (afi->family != NFPROTO_NETDEV)
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continue;
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list_for_each_entry(table, &afi->tables, list) {
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ctx.table = table;
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list_for_each_entry_safe(chain, nr, &table->chains, list) {
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if (!(chain->flags & NFT_BASE_CHAIN))
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continue;
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ctx.chain = chain;
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nft_netdev_event(event, dev, &ctx);
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}
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}
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}
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nfnl_unlock(NFNL_SUBSYS_NFTABLES);
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return NOTIFY_DONE;
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}
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static struct notifier_block nf_tables_netdev_notifier = {
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.notifier_call = nf_tables_netdev_event,
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};
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static int __init nf_tables_netdev_init(void)
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{
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int ret;
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ret = nft_register_chain_type(&nft_filter_chain_netdev);
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if (ret)
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return ret;
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ret = register_pernet_subsys(&nf_tables_netdev_net_ops);
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if (ret)
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goto err1;
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ret = register_netdevice_notifier(&nf_tables_netdev_notifier);
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if (ret)
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goto err2;
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return 0;
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err2:
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unregister_pernet_subsys(&nf_tables_netdev_net_ops);
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err1:
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nft_unregister_chain_type(&nft_filter_chain_netdev);
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return ret;
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}
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static void __exit nf_tables_netdev_exit(void)
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{
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unregister_netdevice_notifier(&nf_tables_netdev_notifier);
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unregister_pernet_subsys(&nf_tables_netdev_net_ops);
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nft_unregister_chain_type(&nft_filter_chain_netdev);
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}
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module_init(nf_tables_netdev_init);
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module_exit(nf_tables_netdev_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_ALIAS_NFT_FAMILY(5); /* NFPROTO_NETDEV */
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