8411b6442e
This patch adds support for set flushing, that consists of walking over the set elements if the NFTA_SET_ELEM_LIST_ELEMENTS attribute is set. This patch requires the following changes: 1) Add set->ops->deactivate_one() operation: This allows us to deactivate an element from the set element walk path, given we can skip the lookup that happens in ->deactivate(). 2) Add a new nft_trans_alloc_gfp() function since we need to allocate transactions using GFP_ATOMIC given the set walk path happens with held rcu_read_lock. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5580 lines
134 KiB
C
5580 lines
134 KiB
C
/*
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* Copyright (c) 2007-2009 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/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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static LIST_HEAD(nf_tables_expressions);
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static LIST_HEAD(nf_tables_objects);
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/**
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* nft_register_afinfo - register nf_tables address family info
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*
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* @afi: address family info to register
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*
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* Register the address family for use with nf_tables. Returns zero on
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* success or a negative errno code otherwise.
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*/
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int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
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{
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INIT_LIST_HEAD(&afi->tables);
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nfnl_lock(NFNL_SUBSYS_NFTABLES);
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list_add_tail_rcu(&afi->list, &net->nft.af_info);
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nfnl_unlock(NFNL_SUBSYS_NFTABLES);
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return 0;
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}
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EXPORT_SYMBOL_GPL(nft_register_afinfo);
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static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
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/**
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* nft_unregister_afinfo - unregister nf_tables address family info
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*
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* @afi: address family info to unregister
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*
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* Unregister the address family for use with nf_tables.
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*/
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void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
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{
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nfnl_lock(NFNL_SUBSYS_NFTABLES);
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__nft_release_afinfo(net, afi);
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list_del_rcu(&afi->list);
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nfnl_unlock(NFNL_SUBSYS_NFTABLES);
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}
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EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
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static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
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{
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struct nft_af_info *afi;
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list_for_each_entry(afi, &net->nft.af_info, list) {
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if (afi->family == family)
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return afi;
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}
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return NULL;
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}
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static struct nft_af_info *
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nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
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{
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struct nft_af_info *afi;
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afi = nft_afinfo_lookup(net, family);
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if (afi != NULL)
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return afi;
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#ifdef CONFIG_MODULES
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if (autoload) {
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nfnl_unlock(NFNL_SUBSYS_NFTABLES);
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request_module("nft-afinfo-%u", family);
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nfnl_lock(NFNL_SUBSYS_NFTABLES);
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afi = nft_afinfo_lookup(net, family);
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if (afi != NULL)
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return ERR_PTR(-EAGAIN);
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}
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#endif
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return ERR_PTR(-EAFNOSUPPORT);
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}
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static void nft_ctx_init(struct nft_ctx *ctx,
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struct net *net,
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const struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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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,
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const struct nlattr * const *nla)
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{
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ctx->net = net;
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ctx->afi = afi;
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ctx->table = table;
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ctx->chain = chain;
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ctx->nla = nla;
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ctx->portid = NETLINK_CB(skb).portid;
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ctx->report = nlmsg_report(nlh);
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ctx->seq = nlh->nlmsg_seq;
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}
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static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
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int msg_type, u32 size, gfp_t gfp)
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{
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struct nft_trans *trans;
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trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
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if (trans == NULL)
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return NULL;
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trans->msg_type = msg_type;
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trans->ctx = *ctx;
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return trans;
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}
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static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
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int msg_type, u32 size)
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{
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return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
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}
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static void nft_trans_destroy(struct nft_trans *trans)
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{
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list_del(&trans->list);
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kfree(trans);
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}
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static int nf_tables_register_hooks(struct net *net,
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const struct nft_table *table,
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struct nft_chain *chain,
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unsigned int hook_nops)
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{
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if (table->flags & NFT_TABLE_F_DORMANT ||
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!(chain->flags & NFT_BASE_CHAIN))
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return 0;
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return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
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hook_nops);
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}
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static void nf_tables_unregister_hooks(struct net *net,
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const struct nft_table *table,
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struct nft_chain *chain,
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unsigned int hook_nops)
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{
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if (table->flags & NFT_TABLE_F_DORMANT ||
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!(chain->flags & NFT_BASE_CHAIN))
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return;
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nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
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}
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static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWTABLE)
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nft_activate_next(ctx->net, ctx->table);
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_deltable(struct nft_ctx *ctx)
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{
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int err;
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err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
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if (err < 0)
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return err;
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nft_deactivate_next(ctx->net, ctx->table);
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return err;
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}
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static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWCHAIN)
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nft_activate_next(ctx->net, ctx->chain);
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_delchain(struct nft_ctx *ctx)
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{
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int err;
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err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
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if (err < 0)
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return err;
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ctx->table->use--;
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nft_deactivate_next(ctx->net, ctx->chain);
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return err;
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}
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static int
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nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
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{
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/* You cannot delete the same rule twice */
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if (nft_is_active_next(ctx->net, rule)) {
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nft_deactivate_next(ctx->net, rule);
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ctx->chain->use--;
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return 0;
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}
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return -ENOENT;
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}
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static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
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struct nft_rule *rule)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
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if (trans == NULL)
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return NULL;
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nft_trans_rule(trans) = rule;
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return trans;
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}
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static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
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{
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struct nft_trans *trans;
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int err;
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trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
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if (trans == NULL)
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return -ENOMEM;
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err = nf_tables_delrule_deactivate(ctx, rule);
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if (err < 0) {
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nft_trans_destroy(trans);
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return err;
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}
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return 0;
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}
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static int nft_delrule_by_chain(struct nft_ctx *ctx)
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{
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struct nft_rule *rule;
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int err;
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list_for_each_entry(rule, &ctx->chain->rules, list) {
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err = nft_delrule(ctx, rule);
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if (err < 0)
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return err;
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}
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return 0;
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}
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static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
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struct nft_set *set)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
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nft_trans_set_id(trans) =
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ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
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nft_activate_next(ctx->net, set);
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}
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nft_trans_set(trans) = set;
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
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{
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int err;
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err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
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if (err < 0)
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return err;
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nft_deactivate_next(ctx->net, set);
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ctx->table->use--;
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return err;
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}
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static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
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struct nft_object *obj)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWOBJ)
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nft_activate_next(ctx->net, obj);
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nft_trans_obj(trans) = obj;
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
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{
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int err;
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err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
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if (err < 0)
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return err;
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nft_deactivate_next(ctx->net, obj);
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ctx->table->use--;
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return err;
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}
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/*
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* Tables
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*/
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static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
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const struct nlattr *nla,
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u8 genmask)
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{
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struct nft_table *table;
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list_for_each_entry(table, &afi->tables, list) {
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if (!nla_strcmp(nla, table->name) &&
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nft_active_genmask(table, genmask))
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return table;
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}
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return NULL;
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}
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static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
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const struct nlattr *nla,
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u8 genmask)
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{
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struct nft_table *table;
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if (nla == NULL)
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return ERR_PTR(-EINVAL);
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table = nft_table_lookup(afi, nla, genmask);
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if (table != NULL)
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return table;
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return ERR_PTR(-ENOENT);
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}
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static inline u64 nf_tables_alloc_handle(struct nft_table *table)
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{
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return ++table->hgenerator;
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}
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static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
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static const struct nf_chain_type *
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__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
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{
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int i;
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for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
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if (chain_type[family][i] != NULL &&
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!nla_strcmp(nla, chain_type[family][i]->name))
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return chain_type[family][i];
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}
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return NULL;
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}
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static const struct nf_chain_type *
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nf_tables_chain_type_lookup(const struct nft_af_info *afi,
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const struct nlattr *nla,
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bool autoload)
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{
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const struct nf_chain_type *type;
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type = __nf_tables_chain_type_lookup(afi->family, nla);
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if (type != NULL)
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return type;
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#ifdef CONFIG_MODULES
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if (autoload) {
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nfnl_unlock(NFNL_SUBSYS_NFTABLES);
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request_module("nft-chain-%u-%.*s", afi->family,
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nla_len(nla), (const char *)nla_data(nla));
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nfnl_lock(NFNL_SUBSYS_NFTABLES);
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type = __nf_tables_chain_type_lookup(afi->family, nla);
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if (type != NULL)
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return ERR_PTR(-EAGAIN);
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}
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#endif
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return ERR_PTR(-ENOENT);
|
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}
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|
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static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
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[NFTA_TABLE_NAME] = { .type = NLA_STRING,
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.len = NFT_TABLE_MAXNAMELEN - 1 },
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[NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
|
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};
|
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|
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static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
|
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u32 portid, u32 seq, int event, u32 flags,
|
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int family, const struct nft_table *table)
|
|
{
|
|
struct nlmsghdr *nlh;
|
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struct nfgenmsg *nfmsg;
|
|
|
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event |= NFNL_SUBSYS_NFTABLES << 8;
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nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
|
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if (nlh == NULL)
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goto nla_put_failure;
|
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|
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nfmsg = nlmsg_data(nlh);
|
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nfmsg->nfgen_family = family;
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nfmsg->version = NFNETLINK_V0;
|
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nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
|
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if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
|
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nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
|
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nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
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return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
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return -1;
|
|
}
|
|
|
|
static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
|
|
{
|
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struct sk_buff *skb;
|
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int err;
|
|
|
|
if (!ctx->report &&
|
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!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return 0;
|
|
|
|
err = -ENOBUFS;
|
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skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
|
|
event, 0, ctx->afi->family, ctx->table);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
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ctx->report, GFP_KERNEL);
|
|
err:
|
|
if (err < 0) {
|
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nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
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err);
|
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}
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_dump_tables(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
const struct nft_af_info *afi;
|
|
const struct nft_table *table;
|
|
unsigned int idx = 0, s_idx = cb->args[0];
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
|
|
rcu_read_lock();
|
|
cb->seq = net->nft.base_seq;
|
|
|
|
list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
|
|
if (family != NFPROTO_UNSPEC && family != afi->family)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(table, &afi->tables, list) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (!nft_is_active(net, table))
|
|
continue;
|
|
if (nf_tables_fill_table_info(skb, net,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWTABLE,
|
|
NLM_F_MULTI,
|
|
afi->family, table) < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_gettable(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_cur(net);
|
|
const struct nft_af_info *afi;
|
|
const struct nft_table *table;
|
|
struct sk_buff *skb2;
|
|
int family = nfmsg->nfgen_family;
|
|
int err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = nf_tables_dump_tables,
|
|
};
|
|
return netlink_dump_start(nlsk, skb, nlh, &c);
|
|
}
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
|
|
family, table);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
|
|
|
|
err:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_table_enable(struct net *net,
|
|
const struct nft_af_info *afi,
|
|
struct nft_table *table)
|
|
{
|
|
struct nft_chain *chain;
|
|
int err, i = 0;
|
|
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nft_is_active_next(net, chain))
|
|
continue;
|
|
if (!(chain->flags & NFT_BASE_CHAIN))
|
|
continue;
|
|
|
|
err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
|
|
afi->nops);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
i++;
|
|
}
|
|
return 0;
|
|
err:
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nft_is_active_next(net, chain))
|
|
continue;
|
|
if (!(chain->flags & NFT_BASE_CHAIN))
|
|
continue;
|
|
|
|
if (i-- <= 0)
|
|
break;
|
|
|
|
nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
|
|
afi->nops);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void nf_tables_table_disable(struct net *net,
|
|
const struct nft_af_info *afi,
|
|
struct nft_table *table)
|
|
{
|
|
struct nft_chain *chain;
|
|
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nft_is_active_next(net, chain))
|
|
continue;
|
|
if (!(chain->flags & NFT_BASE_CHAIN))
|
|
continue;
|
|
|
|
nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
|
|
afi->nops);
|
|
}
|
|
}
|
|
|
|
static int nf_tables_updtable(struct nft_ctx *ctx)
|
|
{
|
|
struct nft_trans *trans;
|
|
u32 flags;
|
|
int ret = 0;
|
|
|
|
if (!ctx->nla[NFTA_TABLE_FLAGS])
|
|
return 0;
|
|
|
|
flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
|
|
if (flags & ~NFT_TABLE_F_DORMANT)
|
|
return -EINVAL;
|
|
|
|
if (flags == ctx->table->flags)
|
|
return 0;
|
|
|
|
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
|
|
sizeof(struct nft_trans_table));
|
|
if (trans == NULL)
|
|
return -ENOMEM;
|
|
|
|
if ((flags & NFT_TABLE_F_DORMANT) &&
|
|
!(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
|
|
nft_trans_table_enable(trans) = false;
|
|
} else if (!(flags & NFT_TABLE_F_DORMANT) &&
|
|
ctx->table->flags & NFT_TABLE_F_DORMANT) {
|
|
ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
|
|
if (ret >= 0) {
|
|
ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
|
|
nft_trans_table_enable(trans) = true;
|
|
}
|
|
}
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
nft_trans_table_update(trans) = true;
|
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
|
return 0;
|
|
err:
|
|
nft_trans_destroy(trans);
|
|
return ret;
|
|
}
|
|
|
|
static int nf_tables_newtable(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_next(net);
|
|
const struct nlattr *name;
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
int family = nfmsg->nfgen_family;
|
|
u32 flags = 0;
|
|
struct nft_ctx ctx;
|
|
int err;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, true);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
name = nla[NFTA_TABLE_NAME];
|
|
table = nf_tables_table_lookup(afi, name, genmask);
|
|
if (IS_ERR(table)) {
|
|
if (PTR_ERR(table) != -ENOENT)
|
|
return PTR_ERR(table);
|
|
table = NULL;
|
|
}
|
|
|
|
if (table != NULL) {
|
|
if (nlh->nlmsg_flags & NLM_F_EXCL)
|
|
return -EEXIST;
|
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
|
|
return nf_tables_updtable(&ctx);
|
|
}
|
|
|
|
if (nla[NFTA_TABLE_FLAGS]) {
|
|
flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
|
|
if (flags & ~NFT_TABLE_F_DORMANT)
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = -EAFNOSUPPORT;
|
|
if (!try_module_get(afi->owner))
|
|
goto err1;
|
|
|
|
err = -ENOMEM;
|
|
table = kzalloc(sizeof(*table), GFP_KERNEL);
|
|
if (table == NULL)
|
|
goto err2;
|
|
|
|
nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
|
|
INIT_LIST_HEAD(&table->chains);
|
|
INIT_LIST_HEAD(&table->sets);
|
|
INIT_LIST_HEAD(&table->objects);
|
|
table->flags = flags;
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
|
|
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
|
|
if (err < 0)
|
|
goto err3;
|
|
|
|
list_add_tail_rcu(&table->list, &afi->tables);
|
|
return 0;
|
|
err3:
|
|
kfree(table);
|
|
err2:
|
|
module_put(afi->owner);
|
|
err1:
|
|
return err;
|
|
}
|
|
|
|
static int nft_flush_table(struct nft_ctx *ctx)
|
|
{
|
|
int err;
|
|
struct nft_chain *chain, *nc;
|
|
struct nft_object *obj, *ne;
|
|
struct nft_set *set, *ns;
|
|
|
|
list_for_each_entry(chain, &ctx->table->chains, list) {
|
|
if (!nft_is_active_next(ctx->net, chain))
|
|
continue;
|
|
|
|
ctx->chain = chain;
|
|
|
|
err = nft_delrule_by_chain(ctx);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
|
|
if (!nft_is_active_next(ctx->net, set))
|
|
continue;
|
|
|
|
if (set->flags & NFT_SET_ANONYMOUS &&
|
|
!list_empty(&set->bindings))
|
|
continue;
|
|
|
|
err = nft_delset(ctx, set);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
|
|
err = nft_delobj(ctx, obj);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
|
|
if (!nft_is_active_next(ctx->net, chain))
|
|
continue;
|
|
|
|
ctx->chain = chain;
|
|
|
|
err = nft_delchain(ctx);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
err = nft_deltable(ctx);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int nft_flush(struct nft_ctx *ctx, int family)
|
|
{
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table, *nt;
|
|
const struct nlattr * const *nla = ctx->nla;
|
|
int err = 0;
|
|
|
|
list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
|
|
if (family != AF_UNSPEC && afi->family != family)
|
|
continue;
|
|
|
|
ctx->afi = afi;
|
|
list_for_each_entry_safe(table, nt, &afi->tables, list) {
|
|
if (!nft_is_active_next(ctx->net, table))
|
|
continue;
|
|
|
|
if (nla[NFTA_TABLE_NAME] &&
|
|
nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
|
|
continue;
|
|
|
|
ctx->table = table;
|
|
|
|
err = nft_flush_table(ctx);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_deltable(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_next(net);
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
int family = nfmsg->nfgen_family;
|
|
struct nft_ctx ctx;
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
|
|
if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
|
|
return nft_flush(&ctx, family);
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
ctx.afi = afi;
|
|
ctx.table = table;
|
|
|
|
return nft_flush_table(&ctx);
|
|
}
|
|
|
|
static void nf_tables_table_destroy(struct nft_ctx *ctx)
|
|
{
|
|
BUG_ON(ctx->table->use > 0);
|
|
|
|
kfree(ctx->table);
|
|
module_put(ctx->afi->owner);
|
|
}
|
|
|
|
int nft_register_chain_type(const struct nf_chain_type *ctype)
|
|
{
|
|
int err = 0;
|
|
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
if (chain_type[ctype->family][ctype->type] != NULL) {
|
|
err = -EBUSY;
|
|
goto out;
|
|
}
|
|
chain_type[ctype->family][ctype->type] = ctype;
|
|
out:
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_register_chain_type);
|
|
|
|
void nft_unregister_chain_type(const struct nf_chain_type *ctype)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
chain_type[ctype->family][ctype->type] = NULL;
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
|
|
|
|
/*
|
|
* Chains
|
|
*/
|
|
|
|
static struct nft_chain *
|
|
nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
|
|
u8 genmask)
|
|
{
|
|
struct nft_chain *chain;
|
|
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (chain->handle == handle &&
|
|
nft_active_genmask(chain, genmask))
|
|
return chain;
|
|
}
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
|
|
const struct nlattr *nla,
|
|
u8 genmask)
|
|
{
|
|
struct nft_chain *chain;
|
|
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nla_strcmp(nla, chain->name) &&
|
|
nft_active_genmask(chain, genmask))
|
|
return chain;
|
|
}
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
|
|
[NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
|
|
[NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
|
|
[NFTA_CHAIN_NAME] = { .type = NLA_STRING,
|
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
|
[NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
|
|
[NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
|
|
[NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
|
|
[NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
|
|
[NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
|
|
[NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
|
|
[NFTA_HOOK_DEV] = { .type = NLA_STRING,
|
|
.len = IFNAMSIZ - 1 },
|
|
};
|
|
|
|
static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
|
|
{
|
|
struct nft_stats *cpu_stats, total;
|
|
struct nlattr *nest;
|
|
unsigned int seq;
|
|
u64 pkts, bytes;
|
|
int cpu;
|
|
|
|
memset(&total, 0, sizeof(total));
|
|
for_each_possible_cpu(cpu) {
|
|
cpu_stats = per_cpu_ptr(stats, cpu);
|
|
do {
|
|
seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
|
|
pkts = cpu_stats->pkts;
|
|
bytes = cpu_stats->bytes;
|
|
} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
|
|
total.pkts += pkts;
|
|
total.bytes += bytes;
|
|
}
|
|
nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
|
|
NFTA_COUNTER_PAD) ||
|
|
nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
|
|
NFTA_COUNTER_PAD))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq, int event, u32 flags,
|
|
int family, const struct nft_table *table,
|
|
const struct nft_chain *chain)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
|
|
event |= NFNL_SUBSYS_NFTABLES << 8;
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = family;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
|
|
if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
|
|
NFTA_CHAIN_PAD))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
|
|
goto nla_put_failure;
|
|
|
|
if (chain->flags & NFT_BASE_CHAIN) {
|
|
const struct nft_base_chain *basechain = nft_base_chain(chain);
|
|
const struct nf_hook_ops *ops = &basechain->ops[0];
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
|
|
goto nla_put_failure;
|
|
if (basechain->dev_name[0] &&
|
|
nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
|
|
htonl(basechain->policy)))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (!ctx->report &&
|
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return 0;
|
|
|
|
err = -ENOBUFS;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
|
|
event, 0, ctx->afi->family, ctx->table,
|
|
ctx->chain);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
|
ctx->report, GFP_KERNEL);
|
|
err:
|
|
if (err < 0) {
|
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
|
err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_dump_chains(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
const struct nft_af_info *afi;
|
|
const struct nft_table *table;
|
|
const struct nft_chain *chain;
|
|
unsigned int idx = 0, s_idx = cb->args[0];
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
|
|
rcu_read_lock();
|
|
cb->seq = net->nft.base_seq;
|
|
|
|
list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
|
|
if (family != NFPROTO_UNSPEC && family != afi->family)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(table, &afi->tables, list) {
|
|
list_for_each_entry_rcu(chain, &table->chains, list) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (!nft_is_active(net, chain))
|
|
continue;
|
|
if (nf_tables_fill_chain_info(skb, net,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWCHAIN,
|
|
NLM_F_MULTI,
|
|
afi->family, table, chain) < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_getchain(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_cur(net);
|
|
const struct nft_af_info *afi;
|
|
const struct nft_table *table;
|
|
const struct nft_chain *chain;
|
|
struct sk_buff *skb2;
|
|
int family = nfmsg->nfgen_family;
|
|
int err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = nf_tables_dump_chains,
|
|
};
|
|
return netlink_dump_start(nlsk, skb, nlh, &c);
|
|
}
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
|
|
family, table, chain);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
|
|
|
|
err:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
|
|
[NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
|
|
[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
|
|
};
|
|
|
|
static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
|
|
{
|
|
struct nlattr *tb[NFTA_COUNTER_MAX+1];
|
|
struct nft_stats __percpu *newstats;
|
|
struct nft_stats *stats;
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
|
|
if (err < 0)
|
|
return ERR_PTR(err);
|
|
|
|
if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
newstats = netdev_alloc_pcpu_stats(struct nft_stats);
|
|
if (newstats == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* Restore old counters on this cpu, no problem. Per-cpu statistics
|
|
* are not exposed to userspace.
|
|
*/
|
|
preempt_disable();
|
|
stats = this_cpu_ptr(newstats);
|
|
stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
|
|
stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
|
|
preempt_enable();
|
|
|
|
return newstats;
|
|
}
|
|
|
|
static void nft_chain_stats_replace(struct nft_base_chain *chain,
|
|
struct nft_stats __percpu *newstats)
|
|
{
|
|
if (newstats == NULL)
|
|
return;
|
|
|
|
if (chain->stats) {
|
|
struct nft_stats __percpu *oldstats =
|
|
nft_dereference(chain->stats);
|
|
|
|
rcu_assign_pointer(chain->stats, newstats);
|
|
synchronize_rcu();
|
|
free_percpu(oldstats);
|
|
} else
|
|
rcu_assign_pointer(chain->stats, newstats);
|
|
}
|
|
|
|
static void nf_tables_chain_destroy(struct nft_chain *chain)
|
|
{
|
|
BUG_ON(chain->use > 0);
|
|
|
|
if (chain->flags & NFT_BASE_CHAIN) {
|
|
struct nft_base_chain *basechain = nft_base_chain(chain);
|
|
|
|
module_put(basechain->type->owner);
|
|
free_percpu(basechain->stats);
|
|
if (basechain->ops[0].dev != NULL)
|
|
dev_put(basechain->ops[0].dev);
|
|
kfree(basechain);
|
|
} else {
|
|
kfree(chain);
|
|
}
|
|
}
|
|
|
|
struct nft_chain_hook {
|
|
u32 num;
|
|
u32 priority;
|
|
const struct nf_chain_type *type;
|
|
struct net_device *dev;
|
|
};
|
|
|
|
static int nft_chain_parse_hook(struct net *net,
|
|
const struct nlattr * const nla[],
|
|
struct nft_af_info *afi,
|
|
struct nft_chain_hook *hook, bool create)
|
|
{
|
|
struct nlattr *ha[NFTA_HOOK_MAX + 1];
|
|
const struct nf_chain_type *type;
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
|
|
nft_hook_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
|
|
ha[NFTA_HOOK_PRIORITY] == NULL)
|
|
return -EINVAL;
|
|
|
|
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
|
|
if (hook->num >= afi->nhooks)
|
|
return -EINVAL;
|
|
|
|
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
|
|
|
|
type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
|
|
if (nla[NFTA_CHAIN_TYPE]) {
|
|
type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
|
|
create);
|
|
if (IS_ERR(type))
|
|
return PTR_ERR(type);
|
|
}
|
|
if (!(type->hook_mask & (1 << hook->num)))
|
|
return -EOPNOTSUPP;
|
|
if (!try_module_get(type->owner))
|
|
return -ENOENT;
|
|
|
|
hook->type = type;
|
|
|
|
hook->dev = NULL;
|
|
if (afi->flags & NFT_AF_NEEDS_DEV) {
|
|
char ifname[IFNAMSIZ];
|
|
|
|
if (!ha[NFTA_HOOK_DEV]) {
|
|
module_put(type->owner);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
|
|
dev = dev_get_by_name(net, ifname);
|
|
if (!dev) {
|
|
module_put(type->owner);
|
|
return -ENOENT;
|
|
}
|
|
hook->dev = dev;
|
|
} else if (ha[NFTA_HOOK_DEV]) {
|
|
module_put(type->owner);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nft_chain_release_hook(struct nft_chain_hook *hook)
|
|
{
|
|
module_put(hook->type->owner);
|
|
if (hook->dev != NULL)
|
|
dev_put(hook->dev);
|
|
}
|
|
|
|
static int nf_tables_newchain(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
const struct nlattr * uninitialized_var(name);
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
struct nft_chain *chain;
|
|
struct nft_base_chain *basechain = NULL;
|
|
u8 genmask = nft_genmask_next(net);
|
|
int family = nfmsg->nfgen_family;
|
|
u8 policy = NF_ACCEPT;
|
|
u64 handle = 0;
|
|
unsigned int i;
|
|
struct nft_stats __percpu *stats;
|
|
int err;
|
|
bool create;
|
|
struct nft_ctx ctx;
|
|
|
|
create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, true);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
chain = NULL;
|
|
name = nla[NFTA_CHAIN_NAME];
|
|
|
|
if (nla[NFTA_CHAIN_HANDLE]) {
|
|
handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
|
|
chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
} else {
|
|
chain = nf_tables_chain_lookup(table, name, genmask);
|
|
if (IS_ERR(chain)) {
|
|
if (PTR_ERR(chain) != -ENOENT)
|
|
return PTR_ERR(chain);
|
|
chain = NULL;
|
|
}
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_POLICY]) {
|
|
if ((chain != NULL &&
|
|
!(chain->flags & NFT_BASE_CHAIN)))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (chain == NULL &&
|
|
nla[NFTA_CHAIN_HOOK] == NULL)
|
|
return -EOPNOTSUPP;
|
|
|
|
policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
|
|
switch (policy) {
|
|
case NF_DROP:
|
|
case NF_ACCEPT:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (chain != NULL) {
|
|
struct nft_stats *stats = NULL;
|
|
struct nft_trans *trans;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_EXCL)
|
|
return -EEXIST;
|
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (nla[NFTA_CHAIN_HOOK]) {
|
|
struct nft_base_chain *basechain;
|
|
struct nft_chain_hook hook;
|
|
struct nf_hook_ops *ops;
|
|
|
|
if (!(chain->flags & NFT_BASE_CHAIN))
|
|
return -EBUSY;
|
|
|
|
err = nft_chain_parse_hook(net, nla, afi, &hook,
|
|
create);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
basechain = nft_base_chain(chain);
|
|
if (basechain->type != hook.type) {
|
|
nft_chain_release_hook(&hook);
|
|
return -EBUSY;
|
|
}
|
|
|
|
for (i = 0; i < afi->nops; i++) {
|
|
ops = &basechain->ops[i];
|
|
if (ops->hooknum != hook.num ||
|
|
ops->priority != hook.priority ||
|
|
ops->dev != hook.dev) {
|
|
nft_chain_release_hook(&hook);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
nft_chain_release_hook(&hook);
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_HANDLE] && name) {
|
|
struct nft_chain *chain2;
|
|
|
|
chain2 = nf_tables_chain_lookup(table,
|
|
nla[NFTA_CHAIN_NAME],
|
|
genmask);
|
|
if (IS_ERR(chain2))
|
|
return PTR_ERR(chain2);
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_COUNTERS]) {
|
|
if (!(chain->flags & NFT_BASE_CHAIN))
|
|
return -EOPNOTSUPP;
|
|
|
|
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
|
|
if (IS_ERR(stats))
|
|
return PTR_ERR(stats);
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
|
|
trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
|
|
sizeof(struct nft_trans_chain));
|
|
if (trans == NULL) {
|
|
free_percpu(stats);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nft_trans_chain_stats(trans) = stats;
|
|
nft_trans_chain_update(trans) = true;
|
|
|
|
if (nla[NFTA_CHAIN_POLICY])
|
|
nft_trans_chain_policy(trans) = policy;
|
|
else
|
|
nft_trans_chain_policy(trans) = -1;
|
|
|
|
if (nla[NFTA_CHAIN_HANDLE] && name) {
|
|
nla_strlcpy(nft_trans_chain_name(trans), name,
|
|
NFT_CHAIN_MAXNAMELEN);
|
|
}
|
|
list_add_tail(&trans->list, &net->nft.commit_list);
|
|
return 0;
|
|
}
|
|
|
|
if (table->use == UINT_MAX)
|
|
return -EOVERFLOW;
|
|
|
|
if (nla[NFTA_CHAIN_HOOK]) {
|
|
struct nft_chain_hook hook;
|
|
struct nf_hook_ops *ops;
|
|
nf_hookfn *hookfn;
|
|
|
|
err = nft_chain_parse_hook(net, nla, afi, &hook, create);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
|
|
if (basechain == NULL) {
|
|
nft_chain_release_hook(&hook);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (hook.dev != NULL)
|
|
strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
|
|
|
|
if (nla[NFTA_CHAIN_COUNTERS]) {
|
|
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
|
|
if (IS_ERR(stats)) {
|
|
nft_chain_release_hook(&hook);
|
|
kfree(basechain);
|
|
return PTR_ERR(stats);
|
|
}
|
|
basechain->stats = stats;
|
|
} else {
|
|
stats = netdev_alloc_pcpu_stats(struct nft_stats);
|
|
if (stats == NULL) {
|
|
nft_chain_release_hook(&hook);
|
|
kfree(basechain);
|
|
return -ENOMEM;
|
|
}
|
|
rcu_assign_pointer(basechain->stats, stats);
|
|
}
|
|
|
|
hookfn = hook.type->hooks[hook.num];
|
|
basechain->type = hook.type;
|
|
chain = &basechain->chain;
|
|
|
|
for (i = 0; i < afi->nops; i++) {
|
|
ops = &basechain->ops[i];
|
|
ops->pf = family;
|
|
ops->hooknum = hook.num;
|
|
ops->priority = hook.priority;
|
|
ops->priv = chain;
|
|
ops->hook = afi->hooks[ops->hooknum];
|
|
ops->dev = hook.dev;
|
|
if (hookfn)
|
|
ops->hook = hookfn;
|
|
if (afi->hook_ops_init)
|
|
afi->hook_ops_init(ops, i);
|
|
}
|
|
|
|
chain->flags |= NFT_BASE_CHAIN;
|
|
basechain->policy = policy;
|
|
} else {
|
|
chain = kzalloc(sizeof(*chain), GFP_KERNEL);
|
|
if (chain == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&chain->rules);
|
|
chain->handle = nf_tables_alloc_handle(table);
|
|
chain->table = table;
|
|
nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
|
|
|
|
err = nf_tables_register_hooks(net, table, chain, afi->nops);
|
|
if (err < 0)
|
|
goto err1;
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
|
|
err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
table->use++;
|
|
list_add_tail_rcu(&chain->list, &table->chains);
|
|
return 0;
|
|
err2:
|
|
nf_tables_unregister_hooks(net, table, chain, afi->nops);
|
|
err1:
|
|
nf_tables_chain_destroy(chain);
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_delchain(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_next(net);
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
struct nft_chain *chain;
|
|
int family = nfmsg->nfgen_family;
|
|
struct nft_ctx ctx;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
if (chain->use > 0)
|
|
return -EBUSY;
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
|
|
|
|
return nft_delchain(&ctx);
|
|
}
|
|
|
|
/*
|
|
* Expressions
|
|
*/
|
|
|
|
/**
|
|
* nft_register_expr - register nf_tables expr type
|
|
* @ops: expr type
|
|
*
|
|
* Registers the expr type for use with nf_tables. Returns zero on
|
|
* success or a negative errno code otherwise.
|
|
*/
|
|
int nft_register_expr(struct nft_expr_type *type)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
if (type->family == NFPROTO_UNSPEC)
|
|
list_add_tail_rcu(&type->list, &nf_tables_expressions);
|
|
else
|
|
list_add_rcu(&type->list, &nf_tables_expressions);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_register_expr);
|
|
|
|
/**
|
|
* nft_unregister_expr - unregister nf_tables expr type
|
|
* @ops: expr type
|
|
*
|
|
* Unregisters the expr typefor use with nf_tables.
|
|
*/
|
|
void nft_unregister_expr(struct nft_expr_type *type)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_del_rcu(&type->list);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_unregister_expr);
|
|
|
|
static const struct nft_expr_type *__nft_expr_type_get(u8 family,
|
|
struct nlattr *nla)
|
|
{
|
|
const struct nft_expr_type *type;
|
|
|
|
list_for_each_entry(type, &nf_tables_expressions, list) {
|
|
if (!nla_strcmp(nla, type->name) &&
|
|
(!type->family || type->family == family))
|
|
return type;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const struct nft_expr_type *nft_expr_type_get(u8 family,
|
|
struct nlattr *nla)
|
|
{
|
|
const struct nft_expr_type *type;
|
|
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
type = __nft_expr_type_get(family, nla);
|
|
if (type != NULL && try_module_get(type->owner))
|
|
return type;
|
|
|
|
#ifdef CONFIG_MODULES
|
|
if (type == NULL) {
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
request_module("nft-expr-%u-%.*s", family,
|
|
nla_len(nla), (char *)nla_data(nla));
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
if (__nft_expr_type_get(family, nla))
|
|
return ERR_PTR(-EAGAIN);
|
|
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
request_module("nft-expr-%.*s",
|
|
nla_len(nla), (char *)nla_data(nla));
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
if (__nft_expr_type_get(family, nla))
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
#endif
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
|
|
[NFTA_EXPR_NAME] = { .type = NLA_STRING },
|
|
[NFTA_EXPR_DATA] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int nf_tables_fill_expr_info(struct sk_buff *skb,
|
|
const struct nft_expr *expr)
|
|
{
|
|
if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
|
|
goto nla_put_failure;
|
|
|
|
if (expr->ops->dump) {
|
|
struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
|
|
if (data == NULL)
|
|
goto nla_put_failure;
|
|
if (expr->ops->dump(skb, expr) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, data);
|
|
}
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
};
|
|
|
|
int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
|
|
const struct nft_expr *expr)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start(skb, attr);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
if (nf_tables_fill_expr_info(skb, expr) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
struct nft_expr_info {
|
|
const struct nft_expr_ops *ops;
|
|
struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
|
|
};
|
|
|
|
static int nf_tables_expr_parse(const struct nft_ctx *ctx,
|
|
const struct nlattr *nla,
|
|
struct nft_expr_info *info)
|
|
{
|
|
const struct nft_expr_type *type;
|
|
const struct nft_expr_ops *ops;
|
|
struct nlattr *tb[NFTA_EXPR_MAX + 1];
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
|
|
if (IS_ERR(type))
|
|
return PTR_ERR(type);
|
|
|
|
if (tb[NFTA_EXPR_DATA]) {
|
|
err = nla_parse_nested(info->tb, type->maxattr,
|
|
tb[NFTA_EXPR_DATA], type->policy);
|
|
if (err < 0)
|
|
goto err1;
|
|
} else
|
|
memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
|
|
|
|
if (type->select_ops != NULL) {
|
|
ops = type->select_ops(ctx,
|
|
(const struct nlattr * const *)info->tb);
|
|
if (IS_ERR(ops)) {
|
|
err = PTR_ERR(ops);
|
|
goto err1;
|
|
}
|
|
} else
|
|
ops = type->ops;
|
|
|
|
info->ops = ops;
|
|
return 0;
|
|
|
|
err1:
|
|
module_put(type->owner);
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_newexpr(const struct nft_ctx *ctx,
|
|
const struct nft_expr_info *info,
|
|
struct nft_expr *expr)
|
|
{
|
|
const struct nft_expr_ops *ops = info->ops;
|
|
int err;
|
|
|
|
expr->ops = ops;
|
|
if (ops->init) {
|
|
err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
|
|
if (err < 0)
|
|
goto err1;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
expr->ops = NULL;
|
|
return err;
|
|
}
|
|
|
|
static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
|
|
struct nft_expr *expr)
|
|
{
|
|
if (expr->ops->destroy)
|
|
expr->ops->destroy(ctx, expr);
|
|
module_put(expr->ops->type->owner);
|
|
}
|
|
|
|
struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
|
|
const struct nlattr *nla)
|
|
{
|
|
struct nft_expr_info info;
|
|
struct nft_expr *expr;
|
|
int err;
|
|
|
|
err = nf_tables_expr_parse(ctx, nla, &info);
|
|
if (err < 0)
|
|
goto err1;
|
|
|
|
err = -ENOMEM;
|
|
expr = kzalloc(info.ops->size, GFP_KERNEL);
|
|
if (expr == NULL)
|
|
goto err2;
|
|
|
|
err = nf_tables_newexpr(ctx, &info, expr);
|
|
if (err < 0)
|
|
goto err3;
|
|
|
|
return expr;
|
|
err3:
|
|
kfree(expr);
|
|
err2:
|
|
module_put(info.ops->type->owner);
|
|
err1:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
|
|
{
|
|
nf_tables_expr_destroy(ctx, expr);
|
|
kfree(expr);
|
|
}
|
|
|
|
/*
|
|
* Rules
|
|
*/
|
|
|
|
static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
|
|
u64 handle)
|
|
{
|
|
struct nft_rule *rule;
|
|
|
|
// FIXME: this sucks
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
|
if (handle == rule->handle)
|
|
return rule;
|
|
}
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
|
|
const struct nlattr *nla)
|
|
{
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
|
|
}
|
|
|
|
static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
|
|
[NFTA_RULE_TABLE] = { .type = NLA_STRING },
|
|
[NFTA_RULE_CHAIN] = { .type = NLA_STRING,
|
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
|
[NFTA_RULE_HANDLE] = { .type = NLA_U64 },
|
|
[NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
|
|
[NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
|
|
[NFTA_RULE_POSITION] = { .type = NLA_U64 },
|
|
[NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN },
|
|
};
|
|
|
|
static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq, int event,
|
|
u32 flags, int family,
|
|
const struct nft_table *table,
|
|
const struct nft_chain *chain,
|
|
const struct nft_rule *rule)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
const struct nft_expr *expr, *next;
|
|
struct nlattr *list;
|
|
const struct nft_rule *prule;
|
|
int type = event | NFNL_SUBSYS_NFTABLES << 8;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
|
|
flags);
|
|
if (nlh == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = family;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
|
|
if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
|
|
NFTA_RULE_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
|
|
prule = list_entry(rule->list.prev, struct nft_rule, list);
|
|
if (nla_put_be64(skb, NFTA_RULE_POSITION,
|
|
cpu_to_be64(prule->handle),
|
|
NFTA_RULE_PAD))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
|
|
if (list == NULL)
|
|
goto nla_put_failure;
|
|
nft_rule_for_each_expr(expr, next, rule) {
|
|
if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
nla_nest_end(skb, list);
|
|
|
|
if (rule->udata) {
|
|
struct nft_userdata *udata = nft_userdata(rule);
|
|
if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
|
|
udata->data) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int nf_tables_rule_notify(const struct nft_ctx *ctx,
|
|
const struct nft_rule *rule,
|
|
int event)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (!ctx->report &&
|
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return 0;
|
|
|
|
err = -ENOBUFS;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
|
|
event, 0, ctx->afi->family, ctx->table,
|
|
ctx->chain, rule);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
|
ctx->report, GFP_KERNEL);
|
|
err:
|
|
if (err < 0) {
|
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
|
err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
struct nft_rule_dump_ctx {
|
|
char table[NFT_TABLE_MAXNAMELEN];
|
|
char chain[NFT_CHAIN_MAXNAMELEN];
|
|
};
|
|
|
|
static int nf_tables_dump_rules(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
const struct nft_rule_dump_ctx *ctx = cb->data;
|
|
const struct nft_af_info *afi;
|
|
const struct nft_table *table;
|
|
const struct nft_chain *chain;
|
|
const struct nft_rule *rule;
|
|
unsigned int idx = 0, s_idx = cb->args[0];
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
|
|
rcu_read_lock();
|
|
cb->seq = net->nft.base_seq;
|
|
|
|
list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
|
|
if (family != NFPROTO_UNSPEC && family != afi->family)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(table, &afi->tables, list) {
|
|
if (ctx && ctx->table[0] &&
|
|
strcmp(ctx->table, table->name) != 0)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(chain, &table->chains, list) {
|
|
if (ctx && ctx->chain[0] &&
|
|
strcmp(ctx->chain, chain->name) != 0)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(rule, &chain->rules, list) {
|
|
if (!nft_is_active(net, rule))
|
|
goto cont;
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWRULE,
|
|
NLM_F_MULTI | NLM_F_APPEND,
|
|
afi->family, table, chain, rule) < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_dump_rules_done(struct netlink_callback *cb)
|
|
{
|
|
kfree(cb->data);
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_getrule(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_cur(net);
|
|
const struct nft_af_info *afi;
|
|
const struct nft_table *table;
|
|
const struct nft_chain *chain;
|
|
const struct nft_rule *rule;
|
|
struct sk_buff *skb2;
|
|
int family = nfmsg->nfgen_family;
|
|
int err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = nf_tables_dump_rules,
|
|
.done = nf_tables_dump_rules_done,
|
|
};
|
|
|
|
if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
|
|
struct nft_rule_dump_ctx *ctx;
|
|
|
|
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
if (nla[NFTA_RULE_TABLE])
|
|
nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
|
|
sizeof(ctx->table));
|
|
if (nla[NFTA_RULE_CHAIN])
|
|
nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
|
|
sizeof(ctx->chain));
|
|
c.data = ctx;
|
|
}
|
|
|
|
return netlink_dump_start(nlsk, skb, nlh, &c);
|
|
}
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
|
|
rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
|
|
if (IS_ERR(rule))
|
|
return PTR_ERR(rule);
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
|
|
family, table, chain, rule);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
|
|
|
|
err:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
|
|
struct nft_rule *rule)
|
|
{
|
|
struct nft_expr *expr;
|
|
|
|
/*
|
|
* Careful: some expressions might not be initialized in case this
|
|
* is called on error from nf_tables_newrule().
|
|
*/
|
|
expr = nft_expr_first(rule);
|
|
while (expr->ops && expr != nft_expr_last(rule)) {
|
|
nf_tables_expr_destroy(ctx, expr);
|
|
expr = nft_expr_next(expr);
|
|
}
|
|
kfree(rule);
|
|
}
|
|
|
|
#define NFT_RULE_MAXEXPRS 128
|
|
|
|
static struct nft_expr_info *info;
|
|
|
|
static int nf_tables_newrule(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_next(net);
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
struct nft_chain *chain;
|
|
struct nft_rule *rule, *old_rule = NULL;
|
|
struct nft_userdata *udata;
|
|
struct nft_trans *trans = NULL;
|
|
struct nft_expr *expr;
|
|
struct nft_ctx ctx;
|
|
struct nlattr *tmp;
|
|
unsigned int size, i, n, ulen = 0, usize = 0;
|
|
int err, rem;
|
|
bool create;
|
|
u64 handle, pos_handle;
|
|
|
|
create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
|
|
if (nla[NFTA_RULE_HANDLE]) {
|
|
handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
|
|
rule = __nf_tables_rule_lookup(chain, handle);
|
|
if (IS_ERR(rule))
|
|
return PTR_ERR(rule);
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_EXCL)
|
|
return -EEXIST;
|
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
old_rule = rule;
|
|
else
|
|
return -EOPNOTSUPP;
|
|
} else {
|
|
if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EINVAL;
|
|
handle = nf_tables_alloc_handle(table);
|
|
|
|
if (chain->use == UINT_MAX)
|
|
return -EOVERFLOW;
|
|
}
|
|
|
|
if (nla[NFTA_RULE_POSITION]) {
|
|
if (!(nlh->nlmsg_flags & NLM_F_CREATE))
|
|
return -EOPNOTSUPP;
|
|
|
|
pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
|
|
old_rule = __nf_tables_rule_lookup(chain, pos_handle);
|
|
if (IS_ERR(old_rule))
|
|
return PTR_ERR(old_rule);
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
|
|
|
|
n = 0;
|
|
size = 0;
|
|
if (nla[NFTA_RULE_EXPRESSIONS]) {
|
|
nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
|
|
err = -EINVAL;
|
|
if (nla_type(tmp) != NFTA_LIST_ELEM)
|
|
goto err1;
|
|
if (n == NFT_RULE_MAXEXPRS)
|
|
goto err1;
|
|
err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
|
|
if (err < 0)
|
|
goto err1;
|
|
size += info[n].ops->size;
|
|
n++;
|
|
}
|
|
}
|
|
/* Check for overflow of dlen field */
|
|
err = -EFBIG;
|
|
if (size >= 1 << 12)
|
|
goto err1;
|
|
|
|
if (nla[NFTA_RULE_USERDATA]) {
|
|
ulen = nla_len(nla[NFTA_RULE_USERDATA]);
|
|
if (ulen > 0)
|
|
usize = sizeof(struct nft_userdata) + ulen;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
|
|
if (rule == NULL)
|
|
goto err1;
|
|
|
|
nft_activate_next(net, rule);
|
|
|
|
rule->handle = handle;
|
|
rule->dlen = size;
|
|
rule->udata = ulen ? 1 : 0;
|
|
|
|
if (ulen) {
|
|
udata = nft_userdata(rule);
|
|
udata->len = ulen - 1;
|
|
nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
|
|
}
|
|
|
|
expr = nft_expr_first(rule);
|
|
for (i = 0; i < n; i++) {
|
|
err = nf_tables_newexpr(&ctx, &info[i], expr);
|
|
if (err < 0)
|
|
goto err2;
|
|
info[i].ops = NULL;
|
|
expr = nft_expr_next(expr);
|
|
}
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_REPLACE) {
|
|
if (nft_is_active_next(net, old_rule)) {
|
|
trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
|
|
old_rule);
|
|
if (trans == NULL) {
|
|
err = -ENOMEM;
|
|
goto err2;
|
|
}
|
|
nft_deactivate_next(net, old_rule);
|
|
chain->use--;
|
|
list_add_tail_rcu(&rule->list, &old_rule->list);
|
|
} else {
|
|
err = -ENOENT;
|
|
goto err2;
|
|
}
|
|
} else if (nlh->nlmsg_flags & NLM_F_APPEND)
|
|
if (old_rule)
|
|
list_add_rcu(&rule->list, &old_rule->list);
|
|
else
|
|
list_add_tail_rcu(&rule->list, &chain->rules);
|
|
else {
|
|
if (old_rule)
|
|
list_add_tail_rcu(&rule->list, &old_rule->list);
|
|
else
|
|
list_add_rcu(&rule->list, &chain->rules);
|
|
}
|
|
|
|
if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
|
|
err = -ENOMEM;
|
|
goto err3;
|
|
}
|
|
chain->use++;
|
|
return 0;
|
|
|
|
err3:
|
|
list_del_rcu(&rule->list);
|
|
err2:
|
|
nf_tables_rule_destroy(&ctx, rule);
|
|
err1:
|
|
for (i = 0; i < n; i++) {
|
|
if (info[i].ops != NULL)
|
|
module_put(info[i].ops->type->owner);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_delrule(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_next(net);
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
struct nft_chain *chain = NULL;
|
|
struct nft_rule *rule;
|
|
int family = nfmsg->nfgen_family, err = 0;
|
|
struct nft_ctx ctx;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
if (nla[NFTA_RULE_CHAIN]) {
|
|
chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
|
|
genmask);
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
|
|
|
|
if (chain) {
|
|
if (nla[NFTA_RULE_HANDLE]) {
|
|
rule = nf_tables_rule_lookup(chain,
|
|
nla[NFTA_RULE_HANDLE]);
|
|
if (IS_ERR(rule))
|
|
return PTR_ERR(rule);
|
|
|
|
err = nft_delrule(&ctx, rule);
|
|
} else {
|
|
err = nft_delrule_by_chain(&ctx);
|
|
}
|
|
} else {
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nft_is_active_next(net, chain))
|
|
continue;
|
|
|
|
ctx.chain = chain;
|
|
err = nft_delrule_by_chain(&ctx);
|
|
if (err < 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Sets
|
|
*/
|
|
|
|
static LIST_HEAD(nf_tables_set_ops);
|
|
|
|
int nft_register_set(struct nft_set_ops *ops)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_register_set);
|
|
|
|
void nft_unregister_set(struct nft_set_ops *ops)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_del_rcu(&ops->list);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_unregister_set);
|
|
|
|
/*
|
|
* Select a set implementation based on the data characteristics and the
|
|
* given policy. The total memory use might not be known if no size is
|
|
* given, in that case the amount of memory per element is used.
|
|
*/
|
|
static const struct nft_set_ops *
|
|
nft_select_set_ops(const struct nlattr * const nla[],
|
|
const struct nft_set_desc *desc,
|
|
enum nft_set_policies policy)
|
|
{
|
|
const struct nft_set_ops *ops, *bops;
|
|
struct nft_set_estimate est, best;
|
|
u32 features;
|
|
|
|
#ifdef CONFIG_MODULES
|
|
if (list_empty(&nf_tables_set_ops)) {
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
request_module("nft-set");
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
if (!list_empty(&nf_tables_set_ops))
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
#endif
|
|
features = 0;
|
|
if (nla[NFTA_SET_FLAGS] != NULL) {
|
|
features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
|
|
features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
|
|
}
|
|
|
|
bops = NULL;
|
|
best.size = ~0;
|
|
best.class = ~0;
|
|
|
|
list_for_each_entry(ops, &nf_tables_set_ops, list) {
|
|
if ((ops->features & features) != features)
|
|
continue;
|
|
if (!ops->estimate(desc, features, &est))
|
|
continue;
|
|
|
|
switch (policy) {
|
|
case NFT_SET_POL_PERFORMANCE:
|
|
if (est.class < best.class)
|
|
break;
|
|
if (est.class == best.class && est.size < best.size)
|
|
break;
|
|
continue;
|
|
case NFT_SET_POL_MEMORY:
|
|
if (est.size < best.size)
|
|
break;
|
|
if (est.size == best.size && est.class < best.class)
|
|
break;
|
|
continue;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!try_module_get(ops->owner))
|
|
continue;
|
|
if (bops != NULL)
|
|
module_put(bops->owner);
|
|
|
|
bops = ops;
|
|
best = est;
|
|
}
|
|
|
|
if (bops != NULL)
|
|
return bops;
|
|
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
|
|
[NFTA_SET_TABLE] = { .type = NLA_STRING },
|
|
[NFTA_SET_NAME] = { .type = NLA_STRING,
|
|
.len = NFT_SET_MAXNAMELEN - 1 },
|
|
[NFTA_SET_FLAGS] = { .type = NLA_U32 },
|
|
[NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
|
|
[NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
|
|
[NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
|
|
[NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
|
|
[NFTA_SET_POLICY] = { .type = NLA_U32 },
|
|
[NFTA_SET_DESC] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ID] = { .type = NLA_U32 },
|
|
[NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
|
|
[NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
|
|
[NFTA_SET_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN },
|
|
[NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
|
|
[NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
|
|
const struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[],
|
|
u8 genmask)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
struct nft_af_info *afi = NULL;
|
|
struct nft_table *table = NULL;
|
|
|
|
if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
|
|
afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
}
|
|
|
|
if (nla[NFTA_SET_TABLE] != NULL) {
|
|
if (afi == NULL)
|
|
return -EAFNOSUPPORT;
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
|
|
genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
|
|
return 0;
|
|
}
|
|
|
|
struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
|
|
const struct nlattr *nla, u8 genmask)
|
|
{
|
|
struct nft_set *set;
|
|
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
list_for_each_entry(set, &table->sets, list) {
|
|
if (!nla_strcmp(nla, set->name) &&
|
|
nft_active_genmask(set, genmask))
|
|
return set;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
|
|
|
|
struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
|
|
const struct nlattr *nla,
|
|
u8 genmask)
|
|
{
|
|
struct nft_trans *trans;
|
|
u32 id = ntohl(nla_get_be32(nla));
|
|
|
|
list_for_each_entry(trans, &net->nft.commit_list, list) {
|
|
struct nft_set *set = nft_trans_set(trans);
|
|
|
|
if (trans->msg_type == NFT_MSG_NEWSET &&
|
|
id == nft_trans_set_id(trans) &&
|
|
nft_active_genmask(set, genmask))
|
|
return set;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
|
|
|
|
static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
|
|
const char *name)
|
|
{
|
|
const struct nft_set *i;
|
|
const char *p;
|
|
unsigned long *inuse;
|
|
unsigned int n = 0, min = 0;
|
|
|
|
p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
|
|
if (p != NULL) {
|
|
if (p[1] != 'd' || strchr(p + 2, '%'))
|
|
return -EINVAL;
|
|
|
|
inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
|
|
if (inuse == NULL)
|
|
return -ENOMEM;
|
|
cont:
|
|
list_for_each_entry(i, &ctx->table->sets, list) {
|
|
int tmp;
|
|
|
|
if (!nft_is_active_next(ctx->net, set))
|
|
continue;
|
|
if (!sscanf(i->name, name, &tmp))
|
|
continue;
|
|
if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
|
|
continue;
|
|
|
|
set_bit(tmp - min, inuse);
|
|
}
|
|
|
|
n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
|
|
if (n >= BITS_PER_BYTE * PAGE_SIZE) {
|
|
min += BITS_PER_BYTE * PAGE_SIZE;
|
|
memset(inuse, 0, PAGE_SIZE);
|
|
goto cont;
|
|
}
|
|
free_page((unsigned long)inuse);
|
|
}
|
|
|
|
snprintf(set->name, sizeof(set->name), name, min + n);
|
|
list_for_each_entry(i, &ctx->table->sets, list) {
|
|
if (!nft_is_active_next(ctx->net, i))
|
|
continue;
|
|
if (!strcmp(set->name, i->name))
|
|
return -ENFILE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
|
|
const struct nft_set *set, u16 event, u16 flags)
|
|
{
|
|
struct nfgenmsg *nfmsg;
|
|
struct nlmsghdr *nlh;
|
|
struct nlattr *desc;
|
|
u32 portid = ctx->portid;
|
|
u32 seq = ctx->seq;
|
|
|
|
event |= NFNL_SUBSYS_NFTABLES << 8;
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
|
|
flags);
|
|
if (nlh == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = ctx->afi->family;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
|
|
|
|
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_SET_NAME, set->name))
|
|
goto nla_put_failure;
|
|
if (set->flags != 0)
|
|
if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
|
|
goto nla_put_failure;
|
|
if (set->flags & NFT_SET_MAP) {
|
|
if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
|
|
goto nla_put_failure;
|
|
}
|
|
if (set->flags & NFT_SET_OBJECT &&
|
|
nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
|
|
goto nla_put_failure;
|
|
|
|
if (set->timeout &&
|
|
nla_put_be64(skb, NFTA_SET_TIMEOUT,
|
|
cpu_to_be64(jiffies_to_msecs(set->timeout)),
|
|
NFTA_SET_PAD))
|
|
goto nla_put_failure;
|
|
if (set->gc_int &&
|
|
nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
|
|
goto nla_put_failure;
|
|
|
|
if (set->policy != NFT_SET_POL_PERFORMANCE) {
|
|
if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
|
|
goto nla_put_failure;
|
|
|
|
desc = nla_nest_start(skb, NFTA_SET_DESC);
|
|
if (desc == NULL)
|
|
goto nla_put_failure;
|
|
if (set->size &&
|
|
nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, desc);
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int nf_tables_set_notify(const struct nft_ctx *ctx,
|
|
const struct nft_set *set,
|
|
int event, gfp_t gfp_flags)
|
|
{
|
|
struct sk_buff *skb;
|
|
u32 portid = ctx->portid;
|
|
int err;
|
|
|
|
if (!ctx->report &&
|
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return 0;
|
|
|
|
err = -ENOBUFS;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_set(skb, ctx, set, event, 0);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
|
|
ctx->report, gfp_flags);
|
|
err:
|
|
if (err < 0)
|
|
nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
const struct nft_set *set;
|
|
unsigned int idx, s_idx = cb->args[0];
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
|
|
struct net *net = sock_net(skb->sk);
|
|
int cur_family = cb->args[3];
|
|
struct nft_ctx *ctx = cb->data, ctx_set;
|
|
|
|
if (cb->args[1])
|
|
return skb->len;
|
|
|
|
rcu_read_lock();
|
|
cb->seq = net->nft.base_seq;
|
|
|
|
list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
|
|
if (ctx->afi && ctx->afi != afi)
|
|
continue;
|
|
|
|
if (cur_family) {
|
|
if (afi->family != cur_family)
|
|
continue;
|
|
|
|
cur_family = 0;
|
|
}
|
|
list_for_each_entry_rcu(table, &afi->tables, list) {
|
|
if (ctx->table && ctx->table != table)
|
|
continue;
|
|
|
|
if (cur_table) {
|
|
if (cur_table != table)
|
|
continue;
|
|
|
|
cur_table = NULL;
|
|
}
|
|
idx = 0;
|
|
list_for_each_entry_rcu(set, &table->sets, list) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (!nft_is_active(net, set))
|
|
goto cont;
|
|
|
|
ctx_set = *ctx;
|
|
ctx_set.table = table;
|
|
ctx_set.afi = afi;
|
|
if (nf_tables_fill_set(skb, &ctx_set, set,
|
|
NFT_MSG_NEWSET,
|
|
NLM_F_MULTI) < 0) {
|
|
cb->args[0] = idx;
|
|
cb->args[2] = (unsigned long) table;
|
|
cb->args[3] = afi->family;
|
|
goto done;
|
|
}
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
if (s_idx)
|
|
s_idx = 0;
|
|
}
|
|
}
|
|
cb->args[1] = 1;
|
|
done:
|
|
rcu_read_unlock();
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_dump_sets_done(struct netlink_callback *cb)
|
|
{
|
|
kfree(cb->data);
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_getset(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
u8 genmask = nft_genmask_cur(net);
|
|
const struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
struct sk_buff *skb2;
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
int err;
|
|
|
|
/* Verify existence before starting dump */
|
|
err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = nf_tables_dump_sets,
|
|
.done = nf_tables_dump_sets_done,
|
|
};
|
|
struct nft_ctx *ctx_dump;
|
|
|
|
ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
|
|
if (ctx_dump == NULL)
|
|
return -ENOMEM;
|
|
|
|
*ctx_dump = ctx;
|
|
c.data = ctx_dump;
|
|
|
|
return netlink_dump_start(nlsk, skb, nlh, &c);
|
|
}
|
|
|
|
/* Only accept unspec with dump */
|
|
if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
|
|
return -EAFNOSUPPORT;
|
|
if (!nla[NFTA_SET_TABLE])
|
|
return -EINVAL;
|
|
|
|
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
|
|
|
|
err:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
|
|
struct nft_set_desc *desc,
|
|
const struct nlattr *nla)
|
|
{
|
|
struct nlattr *da[NFTA_SET_DESC_MAX + 1];
|
|
int err;
|
|
|
|
err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (da[NFTA_SET_DESC_SIZE] != NULL)
|
|
desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_newset(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_next(net);
|
|
const struct nft_set_ops *ops;
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
char name[NFT_SET_MAXNAMELEN];
|
|
unsigned int size;
|
|
bool create;
|
|
u64 timeout;
|
|
u32 ktype, dtype, flags, policy, gc_int, objtype;
|
|
struct nft_set_desc desc;
|
|
unsigned char *udata;
|
|
u16 udlen;
|
|
int err;
|
|
|
|
if (nla[NFTA_SET_TABLE] == NULL ||
|
|
nla[NFTA_SET_NAME] == NULL ||
|
|
nla[NFTA_SET_KEY_LEN] == NULL ||
|
|
nla[NFTA_SET_ID] == NULL)
|
|
return -EINVAL;
|
|
|
|
memset(&desc, 0, sizeof(desc));
|
|
|
|
ktype = NFT_DATA_VALUE;
|
|
if (nla[NFTA_SET_KEY_TYPE] != NULL) {
|
|
ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
|
|
if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
|
|
return -EINVAL;
|
|
}
|
|
|
|
desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
|
|
if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
|
|
return -EINVAL;
|
|
|
|
flags = 0;
|
|
if (nla[NFTA_SET_FLAGS] != NULL) {
|
|
flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
|
|
if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
|
|
NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
|
|
NFT_SET_MAP | NFT_SET_EVAL |
|
|
NFT_SET_OBJECT))
|
|
return -EINVAL;
|
|
/* Only one of these operations is supported */
|
|
if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
|
|
(NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
dtype = 0;
|
|
if (nla[NFTA_SET_DATA_TYPE] != NULL) {
|
|
if (!(flags & NFT_SET_MAP))
|
|
return -EINVAL;
|
|
|
|
dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
|
|
if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
|
|
dtype != NFT_DATA_VERDICT)
|
|
return -EINVAL;
|
|
|
|
if (dtype != NFT_DATA_VERDICT) {
|
|
if (nla[NFTA_SET_DATA_LEN] == NULL)
|
|
return -EINVAL;
|
|
desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
|
|
if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
|
|
return -EINVAL;
|
|
} else
|
|
desc.dlen = sizeof(struct nft_verdict);
|
|
} else if (flags & NFT_SET_MAP)
|
|
return -EINVAL;
|
|
|
|
if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
|
|
if (!(flags & NFT_SET_OBJECT))
|
|
return -EINVAL;
|
|
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
|
|
if (objtype == NFT_OBJECT_UNSPEC ||
|
|
objtype > NFT_OBJECT_MAX)
|
|
return -EINVAL;
|
|
} else if (flags & NFT_SET_OBJECT)
|
|
return -EINVAL;
|
|
else
|
|
objtype = NFT_OBJECT_UNSPEC;
|
|
|
|
timeout = 0;
|
|
if (nla[NFTA_SET_TIMEOUT] != NULL) {
|
|
if (!(flags & NFT_SET_TIMEOUT))
|
|
return -EINVAL;
|
|
timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
|
|
nla[NFTA_SET_TIMEOUT])));
|
|
}
|
|
gc_int = 0;
|
|
if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
|
|
if (!(flags & NFT_SET_TIMEOUT))
|
|
return -EINVAL;
|
|
gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
|
|
}
|
|
|
|
policy = NFT_SET_POL_PERFORMANCE;
|
|
if (nla[NFTA_SET_POLICY] != NULL)
|
|
policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
|
|
|
|
if (nla[NFTA_SET_DESC] != NULL) {
|
|
err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
|
|
|
|
set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
|
|
if (IS_ERR(set)) {
|
|
if (PTR_ERR(set) != -ENOENT)
|
|
return PTR_ERR(set);
|
|
set = NULL;
|
|
}
|
|
|
|
if (set != NULL) {
|
|
if (nlh->nlmsg_flags & NLM_F_EXCL)
|
|
return -EEXIST;
|
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
return 0;
|
|
}
|
|
|
|
if (!(nlh->nlmsg_flags & NLM_F_CREATE))
|
|
return -ENOENT;
|
|
|
|
ops = nft_select_set_ops(nla, &desc, policy);
|
|
if (IS_ERR(ops))
|
|
return PTR_ERR(ops);
|
|
|
|
udlen = 0;
|
|
if (nla[NFTA_SET_USERDATA])
|
|
udlen = nla_len(nla[NFTA_SET_USERDATA]);
|
|
|
|
size = 0;
|
|
if (ops->privsize != NULL)
|
|
size = ops->privsize(nla);
|
|
|
|
err = -ENOMEM;
|
|
set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
|
|
if (set == NULL)
|
|
goto err1;
|
|
|
|
nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
|
|
err = nf_tables_set_alloc_name(&ctx, set, name);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
udata = NULL;
|
|
if (udlen) {
|
|
udata = set->data + size;
|
|
nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
|
|
}
|
|
|
|
INIT_LIST_HEAD(&set->bindings);
|
|
set->ops = ops;
|
|
set->ktype = ktype;
|
|
set->klen = desc.klen;
|
|
set->dtype = dtype;
|
|
set->objtype = objtype;
|
|
set->dlen = desc.dlen;
|
|
set->flags = flags;
|
|
set->size = desc.size;
|
|
set->policy = policy;
|
|
set->udlen = udlen;
|
|
set->udata = udata;
|
|
set->timeout = timeout;
|
|
set->gc_int = gc_int;
|
|
|
|
err = ops->init(set, &desc, nla);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
|
|
if (err < 0)
|
|
goto err3;
|
|
|
|
list_add_tail_rcu(&set->list, &table->sets);
|
|
table->use++;
|
|
return 0;
|
|
|
|
err3:
|
|
ops->destroy(set);
|
|
err2:
|
|
kfree(set);
|
|
err1:
|
|
module_put(ops->owner);
|
|
return err;
|
|
}
|
|
|
|
static void nft_set_destroy(struct nft_set *set)
|
|
{
|
|
set->ops->destroy(set);
|
|
module_put(set->ops->owner);
|
|
kfree(set);
|
|
}
|
|
|
|
static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
|
|
{
|
|
list_del_rcu(&set->list);
|
|
nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
|
|
nft_set_destroy(set);
|
|
}
|
|
|
|
static int nf_tables_delset(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_next(net);
|
|
struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
int err;
|
|
|
|
if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
|
|
return -EAFNOSUPPORT;
|
|
if (nla[NFTA_SET_TABLE] == NULL)
|
|
return -EINVAL;
|
|
|
|
err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
if (!list_empty(&set->bindings))
|
|
return -EBUSY;
|
|
|
|
return nft_delset(&ctx, set);
|
|
}
|
|
|
|
static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
|
|
const struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
enum nft_registers dreg;
|
|
|
|
dreg = nft_type_to_reg(set->dtype);
|
|
return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
|
|
set->dtype == NFT_DATA_VERDICT ?
|
|
NFT_DATA_VERDICT : NFT_DATA_VALUE,
|
|
set->dlen);
|
|
}
|
|
|
|
int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_set_binding *binding)
|
|
{
|
|
struct nft_set_binding *i;
|
|
struct nft_set_iter iter;
|
|
|
|
if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
|
|
return -EBUSY;
|
|
|
|
if (binding->flags & NFT_SET_MAP) {
|
|
/* If the set is already bound to the same chain all
|
|
* jumps are already validated for that chain.
|
|
*/
|
|
list_for_each_entry(i, &set->bindings, list) {
|
|
if (i->flags & NFT_SET_MAP &&
|
|
i->chain == binding->chain)
|
|
goto bind;
|
|
}
|
|
|
|
iter.genmask = nft_genmask_next(ctx->net);
|
|
iter.skip = 0;
|
|
iter.count = 0;
|
|
iter.err = 0;
|
|
iter.fn = nf_tables_bind_check_setelem;
|
|
|
|
set->ops->walk(ctx, set, &iter);
|
|
if (iter.err < 0)
|
|
return iter.err;
|
|
}
|
|
bind:
|
|
binding->chain = ctx->chain;
|
|
list_add_tail_rcu(&binding->list, &set->bindings);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_bind_set);
|
|
|
|
void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_set_binding *binding)
|
|
{
|
|
list_del_rcu(&binding->list);
|
|
|
|
if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
|
|
nft_is_active(ctx->net, set))
|
|
nf_tables_set_destroy(ctx, set);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
|
|
|
|
const struct nft_set_ext_type nft_set_ext_types[] = {
|
|
[NFT_SET_EXT_KEY] = {
|
|
.align = __alignof__(u32),
|
|
},
|
|
[NFT_SET_EXT_DATA] = {
|
|
.align = __alignof__(u32),
|
|
},
|
|
[NFT_SET_EXT_EXPR] = {
|
|
.align = __alignof__(struct nft_expr),
|
|
},
|
|
[NFT_SET_EXT_OBJREF] = {
|
|
.len = sizeof(struct nft_object *),
|
|
.align = __alignof__(struct nft_object *),
|
|
},
|
|
[NFT_SET_EXT_FLAGS] = {
|
|
.len = sizeof(u8),
|
|
.align = __alignof__(u8),
|
|
},
|
|
[NFT_SET_EXT_TIMEOUT] = {
|
|
.len = sizeof(u64),
|
|
.align = __alignof__(u64),
|
|
},
|
|
[NFT_SET_EXT_EXPIRATION] = {
|
|
.len = sizeof(unsigned long),
|
|
.align = __alignof__(unsigned long),
|
|
},
|
|
[NFT_SET_EXT_USERDATA] = {
|
|
.len = sizeof(struct nft_userdata),
|
|
.align = __alignof__(struct nft_userdata),
|
|
},
|
|
};
|
|
EXPORT_SYMBOL_GPL(nft_set_ext_types);
|
|
|
|
/*
|
|
* Set elements
|
|
*/
|
|
|
|
static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
|
|
[NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
|
|
[NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
|
|
[NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN },
|
|
};
|
|
|
|
static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
|
|
[NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
|
|
[NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
|
|
[NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
|
|
const struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[],
|
|
u8 genmask)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
|
|
genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_fill_setelem(struct sk_buff *skb,
|
|
const struct nft_set *set,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start(skb, NFTA_LIST_ELEM);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
|
|
NFT_DATA_VALUE, set->klen) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
|
|
nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
|
|
set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
|
|
set->dlen) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
|
|
nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
|
|
nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
|
|
(*nft_set_ext_obj(ext))->name) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
|
|
nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
|
|
htonl(*nft_set_ext_flags(ext))))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
|
|
nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
|
|
cpu_to_be64(jiffies_to_msecs(
|
|
*nft_set_ext_timeout(ext))),
|
|
NFTA_SET_ELEM_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
|
|
unsigned long expires, now = jiffies;
|
|
|
|
expires = *nft_set_ext_expiration(ext);
|
|
if (time_before(now, expires))
|
|
expires -= now;
|
|
else
|
|
expires = 0;
|
|
|
|
if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
|
|
cpu_to_be64(jiffies_to_msecs(expires)),
|
|
NFTA_SET_ELEM_PAD))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
|
|
struct nft_userdata *udata;
|
|
|
|
udata = nft_set_ext_userdata(ext);
|
|
if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
|
|
udata->len + 1, udata->data))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
struct nft_set_dump_args {
|
|
const struct netlink_callback *cb;
|
|
struct nft_set_iter iter;
|
|
struct sk_buff *skb;
|
|
};
|
|
|
|
static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
|
|
const struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
struct nft_set_dump_args *args;
|
|
|
|
args = container_of(iter, struct nft_set_dump_args, iter);
|
|
return nf_tables_fill_setelem(args->skb, set, elem);
|
|
}
|
|
|
|
static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
u8 genmask = nft_genmask_cur(net);
|
|
const struct nft_set *set;
|
|
struct nft_set_dump_args args;
|
|
struct nft_ctx ctx;
|
|
struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
|
|
struct nfgenmsg *nfmsg;
|
|
struct nlmsghdr *nlh;
|
|
struct nlattr *nest;
|
|
u32 portid, seq;
|
|
int event, err;
|
|
|
|
err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
|
|
NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
|
|
(void *)nla, genmask);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
|
|
genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
|
|
event = NFT_MSG_NEWSETELEM;
|
|
event |= NFNL_SUBSYS_NFTABLES << 8;
|
|
portid = NETLINK_CB(cb->skb).portid;
|
|
seq = cb->nlh->nlmsg_seq;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
|
|
NLM_F_MULTI);
|
|
if (nlh == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = ctx.afi->family;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
|
|
|
|
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
|
|
goto nla_put_failure;
|
|
|
|
nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
args.cb = cb;
|
|
args.skb = skb;
|
|
args.iter.genmask = nft_genmask_cur(ctx.net);
|
|
args.iter.skip = cb->args[0];
|
|
args.iter.count = 0;
|
|
args.iter.err = 0;
|
|
args.iter.fn = nf_tables_dump_setelem;
|
|
set->ops->walk(&ctx, set, &args.iter);
|
|
|
|
nla_nest_end(skb, nest);
|
|
nlmsg_end(skb, nlh);
|
|
|
|
if (args.iter.err && args.iter.err != -EMSGSIZE)
|
|
return args.iter.err;
|
|
if (args.iter.count == cb->args[0])
|
|
return 0;
|
|
|
|
cb->args[0] = args.iter.count;
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
u8 genmask = nft_genmask_cur(net);
|
|
const struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
int err;
|
|
|
|
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
|
|
genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = nf_tables_dump_set,
|
|
};
|
|
return netlink_dump_start(nlsk, skb, nlh, &c);
|
|
}
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int nf_tables_fill_setelem_info(struct sk_buff *skb,
|
|
const struct nft_ctx *ctx, u32 seq,
|
|
u32 portid, int event, u16 flags,
|
|
const struct nft_set *set,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
struct nfgenmsg *nfmsg;
|
|
struct nlmsghdr *nlh;
|
|
struct nlattr *nest;
|
|
int err;
|
|
|
|
event |= NFNL_SUBSYS_NFTABLES << 8;
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
|
|
flags);
|
|
if (nlh == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = ctx->afi->family;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
|
|
|
|
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_SET_NAME, set->name))
|
|
goto nla_put_failure;
|
|
|
|
nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
err = nf_tables_fill_setelem(skb, set, elem);
|
|
if (err < 0)
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
|
|
const struct nft_set *set,
|
|
const struct nft_set_elem *elem,
|
|
int event, u16 flags)
|
|
{
|
|
struct net *net = ctx->net;
|
|
u32 portid = ctx->portid;
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
|
return 0;
|
|
|
|
err = -ENOBUFS;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
|
|
set, elem);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
|
|
GFP_KERNEL);
|
|
err:
|
|
if (err < 0)
|
|
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
|
|
return err;
|
|
}
|
|
|
|
static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
|
|
int msg_type,
|
|
struct nft_set *set)
|
|
{
|
|
struct nft_trans *trans;
|
|
|
|
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
|
|
if (trans == NULL)
|
|
return NULL;
|
|
|
|
nft_trans_elem_set(trans) = set;
|
|
return trans;
|
|
}
|
|
|
|
void *nft_set_elem_init(const struct nft_set *set,
|
|
const struct nft_set_ext_tmpl *tmpl,
|
|
const u32 *key, const u32 *data,
|
|
u64 timeout, gfp_t gfp)
|
|
{
|
|
struct nft_set_ext *ext;
|
|
void *elem;
|
|
|
|
elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
|
|
if (elem == NULL)
|
|
return NULL;
|
|
|
|
ext = nft_set_elem_ext(set, elem);
|
|
nft_set_ext_init(ext, tmpl);
|
|
|
|
memcpy(nft_set_ext_key(ext), key, set->klen);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
|
memcpy(nft_set_ext_data(ext), data, set->dlen);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
|
|
*nft_set_ext_expiration(ext) =
|
|
jiffies + timeout;
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
|
|
*nft_set_ext_timeout(ext) = timeout;
|
|
|
|
return elem;
|
|
}
|
|
|
|
void nft_set_elem_destroy(const struct nft_set *set, void *elem,
|
|
bool destroy_expr)
|
|
{
|
|
struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
|
|
|
|
nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
|
nft_data_uninit(nft_set_ext_data(ext), set->dtype);
|
|
if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
|
|
nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
|
|
(*nft_set_ext_obj(ext))->use--;
|
|
kfree(elem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
|
|
|
|
static int nft_setelem_parse_flags(const struct nft_set *set,
|
|
const struct nlattr *attr, u32 *flags)
|
|
{
|
|
if (attr == NULL)
|
|
return 0;
|
|
|
|
*flags = ntohl(nla_get_be32(attr));
|
|
if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
|
|
return -EINVAL;
|
|
if (!(set->flags & NFT_SET_INTERVAL) &&
|
|
*flags & NFT_SET_ELEM_INTERVAL_END)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
|
|
const struct nlattr *attr, u32 nlmsg_flags)
|
|
{
|
|
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nft_data_desc d1, d2;
|
|
struct nft_set_ext_tmpl tmpl;
|
|
struct nft_set_ext *ext, *ext2;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_binding *binding;
|
|
struct nft_object *obj = NULL;
|
|
struct nft_userdata *udata;
|
|
struct nft_data data;
|
|
enum nft_registers dreg;
|
|
struct nft_trans *trans;
|
|
u32 flags = 0;
|
|
u64 timeout;
|
|
u8 ulen;
|
|
int err;
|
|
|
|
err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
|
|
nft_set_elem_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (nla[NFTA_SET_ELEM_KEY] == NULL)
|
|
return -EINVAL;
|
|
|
|
nft_set_ext_prepare(&tmpl);
|
|
|
|
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
|
|
if (err < 0)
|
|
return err;
|
|
if (flags != 0)
|
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
|
|
|
|
if (set->flags & NFT_SET_MAP) {
|
|
if (nla[NFTA_SET_ELEM_DATA] == NULL &&
|
|
!(flags & NFT_SET_ELEM_INTERVAL_END))
|
|
return -EINVAL;
|
|
if (nla[NFTA_SET_ELEM_DATA] != NULL &&
|
|
flags & NFT_SET_ELEM_INTERVAL_END)
|
|
return -EINVAL;
|
|
} else {
|
|
if (nla[NFTA_SET_ELEM_DATA] != NULL)
|
|
return -EINVAL;
|
|
}
|
|
|
|
timeout = 0;
|
|
if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
|
|
if (!(set->flags & NFT_SET_TIMEOUT))
|
|
return -EINVAL;
|
|
timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
|
|
nla[NFTA_SET_ELEM_TIMEOUT])));
|
|
} else if (set->flags & NFT_SET_TIMEOUT) {
|
|
timeout = set->timeout;
|
|
}
|
|
|
|
err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
|
|
nla[NFTA_SET_ELEM_KEY]);
|
|
if (err < 0)
|
|
goto err1;
|
|
err = -EINVAL;
|
|
if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
|
|
goto err2;
|
|
|
|
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
|
|
if (timeout > 0) {
|
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
|
|
if (timeout != set->timeout)
|
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
|
|
if (!(set->flags & NFT_SET_OBJECT)) {
|
|
err = -EINVAL;
|
|
goto err2;
|
|
}
|
|
obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
|
|
set->objtype, genmask);
|
|
if (IS_ERR(obj)) {
|
|
err = PTR_ERR(obj);
|
|
goto err2;
|
|
}
|
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_DATA] != NULL) {
|
|
err = nft_data_init(ctx, &data, sizeof(data), &d2,
|
|
nla[NFTA_SET_ELEM_DATA]);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
err = -EINVAL;
|
|
if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
|
|
goto err3;
|
|
|
|
dreg = nft_type_to_reg(set->dtype);
|
|
list_for_each_entry(binding, &set->bindings, list) {
|
|
struct nft_ctx bind_ctx = {
|
|
.net = ctx->net,
|
|
.afi = ctx->afi,
|
|
.table = ctx->table,
|
|
.chain = (struct nft_chain *)binding->chain,
|
|
};
|
|
|
|
if (!(binding->flags & NFT_SET_MAP))
|
|
continue;
|
|
|
|
err = nft_validate_register_store(&bind_ctx, dreg,
|
|
&data,
|
|
d2.type, d2.len);
|
|
if (err < 0)
|
|
goto err3;
|
|
}
|
|
|
|
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
|
|
}
|
|
|
|
/* The full maximum length of userdata can exceed the maximum
|
|
* offset value (U8_MAX) for following extensions, therefor it
|
|
* must be the last extension added.
|
|
*/
|
|
ulen = 0;
|
|
if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
|
|
ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
|
|
if (ulen > 0)
|
|
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
|
|
ulen);
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
|
|
timeout, GFP_KERNEL);
|
|
if (elem.priv == NULL)
|
|
goto err3;
|
|
|
|
ext = nft_set_elem_ext(set, elem.priv);
|
|
if (flags)
|
|
*nft_set_ext_flags(ext) = flags;
|
|
if (ulen > 0) {
|
|
udata = nft_set_ext_userdata(ext);
|
|
udata->len = ulen - 1;
|
|
nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
|
|
}
|
|
if (obj) {
|
|
*nft_set_ext_obj(ext) = obj;
|
|
obj->use++;
|
|
}
|
|
|
|
trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
|
|
if (trans == NULL)
|
|
goto err4;
|
|
|
|
ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
|
|
err = set->ops->insert(ctx->net, set, &elem, &ext2);
|
|
if (err) {
|
|
if (err == -EEXIST) {
|
|
if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
|
|
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
|
|
memcmp(nft_set_ext_data(ext),
|
|
nft_set_ext_data(ext2), set->dlen) != 0) ||
|
|
(nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
|
|
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
|
|
*nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
|
|
err = -EBUSY;
|
|
else if (!(nlmsg_flags & NLM_F_EXCL))
|
|
err = 0;
|
|
}
|
|
goto err5;
|
|
}
|
|
|
|
nft_trans_elem(trans) = elem;
|
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
|
return 0;
|
|
|
|
err5:
|
|
kfree(trans);
|
|
err4:
|
|
kfree(elem.priv);
|
|
err3:
|
|
if (nla[NFTA_SET_ELEM_DATA] != NULL)
|
|
nft_data_uninit(&data, d2.type);
|
|
err2:
|
|
nft_data_uninit(&elem.key.val, d1.type);
|
|
err1:
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
u8 genmask = nft_genmask_next(net);
|
|
const struct nlattr *attr;
|
|
struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
int rem, err = 0;
|
|
|
|
if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
|
|
return -EINVAL;
|
|
|
|
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
|
|
genmask);
|
|
if (IS_ERR(set)) {
|
|
if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
|
|
set = nf_tables_set_lookup_byid(net,
|
|
nla[NFTA_SET_ELEM_LIST_SET_ID],
|
|
genmask);
|
|
}
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
}
|
|
|
|
if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
|
|
return -EBUSY;
|
|
|
|
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
|
|
if (set->size &&
|
|
!atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
|
|
return -ENFILE;
|
|
|
|
err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
|
|
if (err < 0) {
|
|
atomic_dec(&set->nelems);
|
|
break;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
|
|
const struct nlattr *attr)
|
|
{
|
|
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
|
|
struct nft_set_ext_tmpl tmpl;
|
|
struct nft_data_desc desc;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_ext *ext;
|
|
struct nft_trans *trans;
|
|
u32 flags = 0;
|
|
void *priv;
|
|
int err;
|
|
|
|
err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
|
|
nft_set_elem_policy);
|
|
if (err < 0)
|
|
goto err1;
|
|
|
|
err = -EINVAL;
|
|
if (nla[NFTA_SET_ELEM_KEY] == NULL)
|
|
goto err1;
|
|
|
|
nft_set_ext_prepare(&tmpl);
|
|
|
|
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
|
|
if (err < 0)
|
|
return err;
|
|
if (flags != 0)
|
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
|
|
|
|
err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
|
|
nla[NFTA_SET_ELEM_KEY]);
|
|
if (err < 0)
|
|
goto err1;
|
|
|
|
err = -EINVAL;
|
|
if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
|
|
goto err2;
|
|
|
|
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
|
|
|
|
err = -ENOMEM;
|
|
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
|
|
GFP_KERNEL);
|
|
if (elem.priv == NULL)
|
|
goto err2;
|
|
|
|
ext = nft_set_elem_ext(set, elem.priv);
|
|
if (flags)
|
|
*nft_set_ext_flags(ext) = flags;
|
|
|
|
trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
|
|
if (trans == NULL) {
|
|
err = -ENOMEM;
|
|
goto err3;
|
|
}
|
|
|
|
priv = set->ops->deactivate(ctx->net, set, &elem);
|
|
if (priv == NULL) {
|
|
err = -ENOENT;
|
|
goto err4;
|
|
}
|
|
kfree(elem.priv);
|
|
elem.priv = priv;
|
|
|
|
nft_trans_elem(trans) = elem;
|
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
|
return 0;
|
|
|
|
err4:
|
|
kfree(trans);
|
|
err3:
|
|
kfree(elem.priv);
|
|
err2:
|
|
nft_data_uninit(&elem.key.val, desc.type);
|
|
err1:
|
|
return err;
|
|
}
|
|
|
|
static int nft_flush_set(const struct nft_ctx *ctx,
|
|
const struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
struct nft_trans *trans;
|
|
int err;
|
|
|
|
trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
|
|
sizeof(struct nft_trans_elem), GFP_ATOMIC);
|
|
if (!trans)
|
|
return -ENOMEM;
|
|
|
|
if (!set->ops->deactivate_one(ctx->net, set, elem->priv)) {
|
|
err = -ENOENT;
|
|
goto err1;
|
|
}
|
|
|
|
nft_trans_elem_set(trans) = (struct nft_set *)set;
|
|
nft_trans_elem(trans) = *((struct nft_set_elem *)elem);
|
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
|
|
|
return 0;
|
|
err1:
|
|
kfree(trans);
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
u8 genmask = nft_genmask_next(net);
|
|
const struct nlattr *attr;
|
|
struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
int rem, err = 0;
|
|
|
|
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
|
|
genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
|
|
return -EBUSY;
|
|
|
|
if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
|
|
struct nft_set_dump_args args = {
|
|
.iter = {
|
|
.genmask = genmask,
|
|
.fn = nft_flush_set,
|
|
},
|
|
};
|
|
set->ops->walk(&ctx, set, &args.iter);
|
|
|
|
return args.iter.err;
|
|
}
|
|
|
|
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
|
|
err = nft_del_setelem(&ctx, set, attr);
|
|
if (err < 0)
|
|
break;
|
|
|
|
set->ndeact++;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
void nft_set_gc_batch_release(struct rcu_head *rcu)
|
|
{
|
|
struct nft_set_gc_batch *gcb;
|
|
unsigned int i;
|
|
|
|
gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
|
|
for (i = 0; i < gcb->head.cnt; i++)
|
|
nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
|
|
kfree(gcb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
|
|
|
|
struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
|
|
gfp_t gfp)
|
|
{
|
|
struct nft_set_gc_batch *gcb;
|
|
|
|
gcb = kzalloc(sizeof(*gcb), gfp);
|
|
if (gcb == NULL)
|
|
return gcb;
|
|
gcb->head.set = set;
|
|
return gcb;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
|
|
|
|
/*
|
|
* Stateful objects
|
|
*/
|
|
|
|
/**
|
|
* nft_register_obj- register nf_tables stateful object type
|
|
* @obj: object type
|
|
*
|
|
* Registers the object type for use with nf_tables. Returns zero on
|
|
* success or a negative errno code otherwise.
|
|
*/
|
|
int nft_register_obj(struct nft_object_type *obj_type)
|
|
{
|
|
if (obj_type->type == NFT_OBJECT_UNSPEC)
|
|
return -EINVAL;
|
|
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_add_rcu(&obj_type->list, &nf_tables_objects);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_register_obj);
|
|
|
|
/**
|
|
* nft_unregister_obj - unregister nf_tables object type
|
|
* @obj: object type
|
|
*
|
|
* Unregisters the object type for use with nf_tables.
|
|
*/
|
|
void nft_unregister_obj(struct nft_object_type *obj_type)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_del_rcu(&obj_type->list);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_unregister_obj);
|
|
|
|
struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
|
|
const struct nlattr *nla,
|
|
u32 objtype, u8 genmask)
|
|
{
|
|
struct nft_object *obj;
|
|
|
|
list_for_each_entry(obj, &table->objects, list) {
|
|
if (!nla_strcmp(nla, obj->name) &&
|
|
objtype == obj->type->type &&
|
|
nft_active_genmask(obj, genmask))
|
|
return obj;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
|
|
|
|
static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
|
|
[NFTA_OBJ_TABLE] = { .type = NLA_STRING },
|
|
[NFTA_OBJ_NAME] = { .type = NLA_STRING },
|
|
[NFTA_OBJ_TYPE] = { .type = NLA_U32 },
|
|
[NFTA_OBJ_DATA] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static struct nft_object *nft_obj_init(const struct nft_object_type *type,
|
|
const struct nlattr *attr)
|
|
{
|
|
struct nlattr *tb[type->maxattr + 1];
|
|
struct nft_object *obj;
|
|
int err;
|
|
|
|
if (attr) {
|
|
err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
|
|
if (err < 0)
|
|
goto err1;
|
|
} else {
|
|
memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
|
|
if (obj == NULL)
|
|
goto err1;
|
|
|
|
err = type->init((const struct nlattr * const *)tb, obj);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
obj->type = type;
|
|
return obj;
|
|
err2:
|
|
kfree(obj);
|
|
err1:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
|
|
struct nft_object *obj, bool reset)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start(skb, attr);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
if (obj->type->dump(skb, obj, reset) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
|
|
{
|
|
const struct nft_object_type *type;
|
|
|
|
list_for_each_entry(type, &nf_tables_objects, list) {
|
|
if (objtype == type->type)
|
|
return type;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const struct nft_object_type *nft_obj_type_get(u32 objtype)
|
|
{
|
|
const struct nft_object_type *type;
|
|
|
|
type = __nft_obj_type_get(objtype);
|
|
if (type != NULL && try_module_get(type->owner))
|
|
return type;
|
|
|
|
#ifdef CONFIG_MODULES
|
|
if (type == NULL) {
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
request_module("nft-obj-%u", objtype);
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
if (__nft_obj_type_get(objtype))
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
#endif
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static int nf_tables_newobj(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
const struct nft_object_type *type;
|
|
u8 genmask = nft_genmask_next(net);
|
|
int family = nfmsg->nfgen_family;
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
struct nft_object *obj;
|
|
struct nft_ctx ctx;
|
|
u32 objtype;
|
|
int err;
|
|
|
|
if (!nla[NFTA_OBJ_TYPE] ||
|
|
!nla[NFTA_OBJ_NAME] ||
|
|
!nla[NFTA_OBJ_DATA])
|
|
return -EINVAL;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, true);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
|
obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
|
|
if (IS_ERR(obj)) {
|
|
err = PTR_ERR(obj);
|
|
if (err != -ENOENT)
|
|
return err;
|
|
|
|
obj = NULL;
|
|
}
|
|
|
|
if (obj != NULL) {
|
|
if (nlh->nlmsg_flags & NLM_F_EXCL)
|
|
return -EEXIST;
|
|
|
|
return 0;
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
|
|
|
|
type = nft_obj_type_get(objtype);
|
|
if (IS_ERR(type))
|
|
return PTR_ERR(type);
|
|
|
|
obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
|
|
if (IS_ERR(obj)) {
|
|
err = PTR_ERR(obj);
|
|
goto err1;
|
|
}
|
|
obj->table = table;
|
|
nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
|
|
|
|
err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
list_add_tail_rcu(&obj->list, &table->objects);
|
|
table->use++;
|
|
return 0;
|
|
err2:
|
|
if (obj->type->destroy)
|
|
obj->type->destroy(obj);
|
|
kfree(obj);
|
|
err1:
|
|
module_put(type->owner);
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq, int event, u32 flags,
|
|
int family, const struct nft_table *table,
|
|
struct nft_object *obj, bool reset)
|
|
{
|
|
struct nfgenmsg *nfmsg;
|
|
struct nlmsghdr *nlh;
|
|
|
|
event |= NFNL_SUBSYS_NFTABLES << 8;
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = family;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
|
|
if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
|
|
nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
|
|
nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
|
|
nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
|
|
nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
struct nft_obj_filter {
|
|
char table[NFT_OBJ_MAXNAMELEN];
|
|
u32 type;
|
|
};
|
|
|
|
static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
const struct nft_af_info *afi;
|
|
const struct nft_table *table;
|
|
unsigned int idx = 0, s_idx = cb->args[0];
|
|
struct nft_obj_filter *filter = cb->data;
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
struct nft_object *obj;
|
|
bool reset = false;
|
|
|
|
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
|
|
reset = true;
|
|
|
|
rcu_read_lock();
|
|
cb->seq = net->nft.base_seq;
|
|
|
|
list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
|
|
if (family != NFPROTO_UNSPEC && family != afi->family)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(table, &afi->tables, list) {
|
|
list_for_each_entry_rcu(obj, &table->objects, list) {
|
|
if (!nft_is_active(net, obj))
|
|
goto cont;
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (filter->table[0] &&
|
|
strcmp(filter->table, table->name))
|
|
goto cont;
|
|
if (filter->type != NFT_OBJECT_UNSPEC &&
|
|
obj->type->type != filter->type)
|
|
goto cont;
|
|
|
|
if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWOBJ,
|
|
NLM_F_MULTI | NLM_F_APPEND,
|
|
afi->family, table, obj, reset) < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_dump_obj_done(struct netlink_callback *cb)
|
|
{
|
|
kfree(cb->data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nft_obj_filter *
|
|
nft_obj_filter_alloc(const struct nlattr * const nla[])
|
|
{
|
|
struct nft_obj_filter *filter;
|
|
|
|
filter = kzalloc(sizeof(*filter), GFP_KERNEL);
|
|
if (!filter)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (nla[NFTA_OBJ_TABLE])
|
|
nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
|
|
NFT_TABLE_MAXNAMELEN);
|
|
if (nla[NFTA_OBJ_TYPE])
|
|
filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
|
|
|
return filter;
|
|
}
|
|
|
|
static int nf_tables_getobj(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_cur(net);
|
|
int family = nfmsg->nfgen_family;
|
|
const struct nft_af_info *afi;
|
|
const struct nft_table *table;
|
|
struct nft_object *obj;
|
|
struct sk_buff *skb2;
|
|
bool reset = false;
|
|
u32 objtype;
|
|
int err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = nf_tables_dump_obj,
|
|
.done = nf_tables_dump_obj_done,
|
|
};
|
|
|
|
if (nla[NFTA_OBJ_TABLE] ||
|
|
nla[NFTA_OBJ_TYPE]) {
|
|
struct nft_obj_filter *filter;
|
|
|
|
filter = nft_obj_filter_alloc(nla);
|
|
if (IS_ERR(filter))
|
|
return -ENOMEM;
|
|
|
|
c.data = filter;
|
|
}
|
|
return netlink_dump_start(nlsk, skb, nlh, &c);
|
|
}
|
|
|
|
if (!nla[NFTA_OBJ_NAME] ||
|
|
!nla[NFTA_OBJ_TYPE])
|
|
return -EINVAL;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, false);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
|
obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
|
|
if (IS_ERR(obj))
|
|
return PTR_ERR(obj);
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
|
|
reset = true;
|
|
|
|
err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
|
|
family, table, obj, reset);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
|
|
err:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nft_obj_destroy(struct nft_object *obj)
|
|
{
|
|
if (obj->type->destroy)
|
|
obj->type->destroy(obj);
|
|
|
|
module_put(obj->type->owner);
|
|
kfree(obj);
|
|
}
|
|
|
|
static int nf_tables_delobj(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u8 genmask = nft_genmask_next(net);
|
|
int family = nfmsg->nfgen_family;
|
|
struct nft_af_info *afi;
|
|
struct nft_table *table;
|
|
struct nft_object *obj;
|
|
struct nft_ctx ctx;
|
|
u32 objtype;
|
|
|
|
if (!nla[NFTA_OBJ_TYPE] ||
|
|
!nla[NFTA_OBJ_NAME])
|
|
return -EINVAL;
|
|
|
|
afi = nf_tables_afinfo_lookup(net, family, true);
|
|
if (IS_ERR(afi))
|
|
return PTR_ERR(afi);
|
|
|
|
table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
|
obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
|
|
if (IS_ERR(obj))
|
|
return PTR_ERR(obj);
|
|
if (obj->use > 0)
|
|
return -EBUSY;
|
|
|
|
nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
|
|
|
|
return nft_delobj(&ctx, obj);
|
|
}
|
|
|
|
int nft_obj_notify(struct net *net, struct nft_table *table,
|
|
struct nft_object *obj, u32 portid, u32 seq, int event,
|
|
int family, int report, gfp_t gfp)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (!report &&
|
|
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
|
return 0;
|
|
|
|
err = -ENOBUFS;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
|
|
table, obj, false);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
|
|
err:
|
|
if (err < 0) {
|
|
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
|
|
}
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_obj_notify);
|
|
|
|
static int nf_tables_obj_notify(const struct nft_ctx *ctx,
|
|
struct nft_object *obj, int event)
|
|
{
|
|
return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
|
|
ctx->seq, event, ctx->afi->family, ctx->report,
|
|
GFP_KERNEL);
|
|
}
|
|
|
|
static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
|
|
if (nlh == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = AF_UNSPEC;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
|
|
if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
|
|
{
|
|
struct nlmsghdr *nlh = nlmsg_hdr(skb);
|
|
struct sk_buff *skb2;
|
|
int err;
|
|
|
|
if (nlmsg_report(nlh) &&
|
|
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
|
return 0;
|
|
|
|
err = -ENOBUFS;
|
|
skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq);
|
|
if (err < 0) {
|
|
kfree_skb(skb2);
|
|
goto err;
|
|
}
|
|
|
|
err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
|
|
NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
|
|
err:
|
|
if (err < 0) {
|
|
nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
|
|
err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_getgen(struct net *net, struct sock *nlsk,
|
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct sk_buff *skb2;
|
|
int err;
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
|
|
err:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
|
|
[NFT_MSG_NEWTABLE] = {
|
|
.call_batch = nf_tables_newtable,
|
|
.attr_count = NFTA_TABLE_MAX,
|
|
.policy = nft_table_policy,
|
|
},
|
|
[NFT_MSG_GETTABLE] = {
|
|
.call = nf_tables_gettable,
|
|
.attr_count = NFTA_TABLE_MAX,
|
|
.policy = nft_table_policy,
|
|
},
|
|
[NFT_MSG_DELTABLE] = {
|
|
.call_batch = nf_tables_deltable,
|
|
.attr_count = NFTA_TABLE_MAX,
|
|
.policy = nft_table_policy,
|
|
},
|
|
[NFT_MSG_NEWCHAIN] = {
|
|
.call_batch = nf_tables_newchain,
|
|
.attr_count = NFTA_CHAIN_MAX,
|
|
.policy = nft_chain_policy,
|
|
},
|
|
[NFT_MSG_GETCHAIN] = {
|
|
.call = nf_tables_getchain,
|
|
.attr_count = NFTA_CHAIN_MAX,
|
|
.policy = nft_chain_policy,
|
|
},
|
|
[NFT_MSG_DELCHAIN] = {
|
|
.call_batch = nf_tables_delchain,
|
|
.attr_count = NFTA_CHAIN_MAX,
|
|
.policy = nft_chain_policy,
|
|
},
|
|
[NFT_MSG_NEWRULE] = {
|
|
.call_batch = nf_tables_newrule,
|
|
.attr_count = NFTA_RULE_MAX,
|
|
.policy = nft_rule_policy,
|
|
},
|
|
[NFT_MSG_GETRULE] = {
|
|
.call = nf_tables_getrule,
|
|
.attr_count = NFTA_RULE_MAX,
|
|
.policy = nft_rule_policy,
|
|
},
|
|
[NFT_MSG_DELRULE] = {
|
|
.call_batch = nf_tables_delrule,
|
|
.attr_count = NFTA_RULE_MAX,
|
|
.policy = nft_rule_policy,
|
|
},
|
|
[NFT_MSG_NEWSET] = {
|
|
.call_batch = nf_tables_newset,
|
|
.attr_count = NFTA_SET_MAX,
|
|
.policy = nft_set_policy,
|
|
},
|
|
[NFT_MSG_GETSET] = {
|
|
.call = nf_tables_getset,
|
|
.attr_count = NFTA_SET_MAX,
|
|
.policy = nft_set_policy,
|
|
},
|
|
[NFT_MSG_DELSET] = {
|
|
.call_batch = nf_tables_delset,
|
|
.attr_count = NFTA_SET_MAX,
|
|
.policy = nft_set_policy,
|
|
},
|
|
[NFT_MSG_NEWSETELEM] = {
|
|
.call_batch = nf_tables_newsetelem,
|
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
|
.policy = nft_set_elem_list_policy,
|
|
},
|
|
[NFT_MSG_GETSETELEM] = {
|
|
.call = nf_tables_getsetelem,
|
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
|
.policy = nft_set_elem_list_policy,
|
|
},
|
|
[NFT_MSG_DELSETELEM] = {
|
|
.call_batch = nf_tables_delsetelem,
|
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
|
.policy = nft_set_elem_list_policy,
|
|
},
|
|
[NFT_MSG_GETGEN] = {
|
|
.call = nf_tables_getgen,
|
|
},
|
|
[NFT_MSG_NEWOBJ] = {
|
|
.call_batch = nf_tables_newobj,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
[NFT_MSG_GETOBJ] = {
|
|
.call = nf_tables_getobj,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
[NFT_MSG_DELOBJ] = {
|
|
.call_batch = nf_tables_delobj,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
[NFT_MSG_GETOBJ_RESET] = {
|
|
.call = nf_tables_getobj,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
};
|
|
|
|
static void nft_chain_commit_update(struct nft_trans *trans)
|
|
{
|
|
struct nft_base_chain *basechain;
|
|
|
|
if (nft_trans_chain_name(trans)[0])
|
|
strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
|
|
|
|
if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
|
|
return;
|
|
|
|
basechain = nft_base_chain(trans->ctx.chain);
|
|
nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
|
|
|
|
switch (nft_trans_chain_policy(trans)) {
|
|
case NF_DROP:
|
|
case NF_ACCEPT:
|
|
basechain->policy = nft_trans_chain_policy(trans);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void nf_tables_commit_release(struct nft_trans *trans)
|
|
{
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_DELTABLE:
|
|
nf_tables_table_destroy(&trans->ctx);
|
|
break;
|
|
case NFT_MSG_DELCHAIN:
|
|
nf_tables_chain_destroy(trans->ctx.chain);
|
|
break;
|
|
case NFT_MSG_DELRULE:
|
|
nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
|
|
break;
|
|
case NFT_MSG_DELSET:
|
|
nft_set_destroy(nft_trans_set(trans));
|
|
break;
|
|
case NFT_MSG_DELSETELEM:
|
|
nft_set_elem_destroy(nft_trans_elem_set(trans),
|
|
nft_trans_elem(trans).priv, true);
|
|
break;
|
|
case NFT_MSG_DELOBJ:
|
|
nft_obj_destroy(nft_trans_obj(trans));
|
|
break;
|
|
}
|
|
kfree(trans);
|
|
}
|
|
|
|
static int nf_tables_commit(struct net *net, struct sk_buff *skb)
|
|
{
|
|
struct nft_trans *trans, *next;
|
|
struct nft_trans_elem *te;
|
|
|
|
/* Bump generation counter, invalidate any dump in progress */
|
|
while (++net->nft.base_seq == 0);
|
|
|
|
/* A new generation has just started */
|
|
net->nft.gencursor = nft_gencursor_next(net);
|
|
|
|
/* Make sure all packets have left the previous generation before
|
|
* purging old rules.
|
|
*/
|
|
synchronize_rcu();
|
|
|
|
list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_NEWTABLE:
|
|
if (nft_trans_table_update(trans)) {
|
|
if (!nft_trans_table_enable(trans)) {
|
|
nf_tables_table_disable(net,
|
|
trans->ctx.afi,
|
|
trans->ctx.table);
|
|
trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
|
|
}
|
|
} else {
|
|
nft_clear(net, trans->ctx.table);
|
|
}
|
|
nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELTABLE:
|
|
list_del_rcu(&trans->ctx.table->list);
|
|
nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
|
|
break;
|
|
case NFT_MSG_NEWCHAIN:
|
|
if (nft_trans_chain_update(trans))
|
|
nft_chain_commit_update(trans);
|
|
else
|
|
nft_clear(net, trans->ctx.chain);
|
|
|
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELCHAIN:
|
|
list_del_rcu(&trans->ctx.chain->list);
|
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
|
|
nf_tables_unregister_hooks(trans->ctx.net,
|
|
trans->ctx.table,
|
|
trans->ctx.chain,
|
|
trans->ctx.afi->nops);
|
|
break;
|
|
case NFT_MSG_NEWRULE:
|
|
nft_clear(trans->ctx.net, nft_trans_rule(trans));
|
|
nf_tables_rule_notify(&trans->ctx,
|
|
nft_trans_rule(trans),
|
|
NFT_MSG_NEWRULE);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELRULE:
|
|
list_del_rcu(&nft_trans_rule(trans)->list);
|
|
nf_tables_rule_notify(&trans->ctx,
|
|
nft_trans_rule(trans),
|
|
NFT_MSG_DELRULE);
|
|
break;
|
|
case NFT_MSG_NEWSET:
|
|
nft_clear(net, nft_trans_set(trans));
|
|
/* This avoids hitting -EBUSY when deleting the table
|
|
* from the transaction.
|
|
*/
|
|
if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
|
|
!list_empty(&nft_trans_set(trans)->bindings))
|
|
trans->ctx.table->use--;
|
|
|
|
nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
|
|
NFT_MSG_NEWSET, GFP_KERNEL);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELSET:
|
|
list_del_rcu(&nft_trans_set(trans)->list);
|
|
nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
|
|
NFT_MSG_DELSET, GFP_KERNEL);
|
|
break;
|
|
case NFT_MSG_NEWSETELEM:
|
|
te = (struct nft_trans_elem *)trans->data;
|
|
|
|
te->set->ops->activate(net, te->set, &te->elem);
|
|
nf_tables_setelem_notify(&trans->ctx, te->set,
|
|
&te->elem,
|
|
NFT_MSG_NEWSETELEM, 0);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELSETELEM:
|
|
te = (struct nft_trans_elem *)trans->data;
|
|
|
|
nf_tables_setelem_notify(&trans->ctx, te->set,
|
|
&te->elem,
|
|
NFT_MSG_DELSETELEM, 0);
|
|
te->set->ops->remove(te->set, &te->elem);
|
|
atomic_dec(&te->set->nelems);
|
|
te->set->ndeact--;
|
|
break;
|
|
case NFT_MSG_NEWOBJ:
|
|
nft_clear(net, nft_trans_obj(trans));
|
|
nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
|
|
NFT_MSG_NEWOBJ);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELOBJ:
|
|
list_del_rcu(&nft_trans_obj(trans)->list);
|
|
nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
|
|
NFT_MSG_DELOBJ);
|
|
break;
|
|
}
|
|
}
|
|
|
|
synchronize_rcu();
|
|
|
|
list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
|
|
list_del(&trans->list);
|
|
nf_tables_commit_release(trans);
|
|
}
|
|
|
|
nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nf_tables_abort_release(struct nft_trans *trans)
|
|
{
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_NEWTABLE:
|
|
nf_tables_table_destroy(&trans->ctx);
|
|
break;
|
|
case NFT_MSG_NEWCHAIN:
|
|
nf_tables_chain_destroy(trans->ctx.chain);
|
|
break;
|
|
case NFT_MSG_NEWRULE:
|
|
nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
|
|
break;
|
|
case NFT_MSG_NEWSET:
|
|
nft_set_destroy(nft_trans_set(trans));
|
|
break;
|
|
case NFT_MSG_NEWSETELEM:
|
|
nft_set_elem_destroy(nft_trans_elem_set(trans),
|
|
nft_trans_elem(trans).priv, true);
|
|
break;
|
|
case NFT_MSG_NEWOBJ:
|
|
nft_obj_destroy(nft_trans_obj(trans));
|
|
break;
|
|
}
|
|
kfree(trans);
|
|
}
|
|
|
|
static int nf_tables_abort(struct net *net, struct sk_buff *skb)
|
|
{
|
|
struct nft_trans *trans, *next;
|
|
struct nft_trans_elem *te;
|
|
|
|
list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
|
|
list) {
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_NEWTABLE:
|
|
if (nft_trans_table_update(trans)) {
|
|
if (nft_trans_table_enable(trans)) {
|
|
nf_tables_table_disable(net,
|
|
trans->ctx.afi,
|
|
trans->ctx.table);
|
|
trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
|
|
}
|
|
nft_trans_destroy(trans);
|
|
} else {
|
|
list_del_rcu(&trans->ctx.table->list);
|
|
}
|
|
break;
|
|
case NFT_MSG_DELTABLE:
|
|
nft_clear(trans->ctx.net, trans->ctx.table);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWCHAIN:
|
|
if (nft_trans_chain_update(trans)) {
|
|
free_percpu(nft_trans_chain_stats(trans));
|
|
|
|
nft_trans_destroy(trans);
|
|
} else {
|
|
trans->ctx.table->use--;
|
|
list_del_rcu(&trans->ctx.chain->list);
|
|
nf_tables_unregister_hooks(trans->ctx.net,
|
|
trans->ctx.table,
|
|
trans->ctx.chain,
|
|
trans->ctx.afi->nops);
|
|
}
|
|
break;
|
|
case NFT_MSG_DELCHAIN:
|
|
trans->ctx.table->use++;
|
|
nft_clear(trans->ctx.net, trans->ctx.chain);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWRULE:
|
|
trans->ctx.chain->use--;
|
|
list_del_rcu(&nft_trans_rule(trans)->list);
|
|
break;
|
|
case NFT_MSG_DELRULE:
|
|
trans->ctx.chain->use++;
|
|
nft_clear(trans->ctx.net, nft_trans_rule(trans));
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWSET:
|
|
trans->ctx.table->use--;
|
|
list_del_rcu(&nft_trans_set(trans)->list);
|
|
break;
|
|
case NFT_MSG_DELSET:
|
|
trans->ctx.table->use++;
|
|
nft_clear(trans->ctx.net, nft_trans_set(trans));
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWSETELEM:
|
|
te = (struct nft_trans_elem *)trans->data;
|
|
|
|
te->set->ops->remove(te->set, &te->elem);
|
|
atomic_dec(&te->set->nelems);
|
|
break;
|
|
case NFT_MSG_DELSETELEM:
|
|
te = (struct nft_trans_elem *)trans->data;
|
|
|
|
te->set->ops->activate(net, te->set, &te->elem);
|
|
te->set->ndeact--;
|
|
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWOBJ:
|
|
trans->ctx.table->use--;
|
|
list_del_rcu(&nft_trans_obj(trans)->list);
|
|
break;
|
|
case NFT_MSG_DELOBJ:
|
|
trans->ctx.table->use++;
|
|
nft_clear(trans->ctx.net, nft_trans_obj(trans));
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
}
|
|
|
|
synchronize_rcu();
|
|
|
|
list_for_each_entry_safe_reverse(trans, next,
|
|
&net->nft.commit_list, list) {
|
|
list_del(&trans->list);
|
|
nf_tables_abort_release(trans);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nfnetlink_subsystem nf_tables_subsys = {
|
|
.name = "nf_tables",
|
|
.subsys_id = NFNL_SUBSYS_NFTABLES,
|
|
.cb_count = NFT_MSG_MAX,
|
|
.cb = nf_tables_cb,
|
|
.commit = nf_tables_commit,
|
|
.abort = nf_tables_abort,
|
|
};
|
|
|
|
int nft_chain_validate_dependency(const struct nft_chain *chain,
|
|
enum nft_chain_type type)
|
|
{
|
|
const struct nft_base_chain *basechain;
|
|
|
|
if (chain->flags & NFT_BASE_CHAIN) {
|
|
basechain = nft_base_chain(chain);
|
|
if (basechain->type->type != type)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
|
|
|
|
int nft_chain_validate_hooks(const struct nft_chain *chain,
|
|
unsigned int hook_flags)
|
|
{
|
|
struct nft_base_chain *basechain;
|
|
|
|
if (chain->flags & NFT_BASE_CHAIN) {
|
|
basechain = nft_base_chain(chain);
|
|
|
|
if ((1 << basechain->ops[0].hooknum) & hook_flags)
|
|
return 0;
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
|
|
|
|
/*
|
|
* Loop detection - walk through the ruleset beginning at the destination chain
|
|
* of a new jump until either the source chain is reached (loop) or all
|
|
* reachable chains have been traversed.
|
|
*
|
|
* The loop check is performed whenever a new jump verdict is added to an
|
|
* expression or verdict map or a verdict map is bound to a new chain.
|
|
*/
|
|
|
|
static int nf_tables_check_loops(const struct nft_ctx *ctx,
|
|
const struct nft_chain *chain);
|
|
|
|
static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
|
|
const struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
const struct nft_data *data;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
|
|
*nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
|
|
return 0;
|
|
|
|
data = nft_set_ext_data(ext);
|
|
switch (data->verdict.code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
return nf_tables_check_loops(ctx, data->verdict.chain);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int nf_tables_check_loops(const struct nft_ctx *ctx,
|
|
const struct nft_chain *chain)
|
|
{
|
|
const struct nft_rule *rule;
|
|
const struct nft_expr *expr, *last;
|
|
const struct nft_set *set;
|
|
struct nft_set_binding *binding;
|
|
struct nft_set_iter iter;
|
|
|
|
if (ctx->chain == chain)
|
|
return -ELOOP;
|
|
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
|
nft_rule_for_each_expr(expr, last, rule) {
|
|
const struct nft_data *data = NULL;
|
|
int err;
|
|
|
|
if (!expr->ops->validate)
|
|
continue;
|
|
|
|
err = expr->ops->validate(ctx, expr, &data);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (data == NULL)
|
|
continue;
|
|
|
|
switch (data->verdict.code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
err = nf_tables_check_loops(ctx,
|
|
data->verdict.chain);
|
|
if (err < 0)
|
|
return err;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(set, &ctx->table->sets, list) {
|
|
if (!nft_is_active_next(ctx->net, set))
|
|
continue;
|
|
if (!(set->flags & NFT_SET_MAP) ||
|
|
set->dtype != NFT_DATA_VERDICT)
|
|
continue;
|
|
|
|
list_for_each_entry(binding, &set->bindings, list) {
|
|
if (!(binding->flags & NFT_SET_MAP) ||
|
|
binding->chain != chain)
|
|
continue;
|
|
|
|
iter.genmask = nft_genmask_next(ctx->net);
|
|
iter.skip = 0;
|
|
iter.count = 0;
|
|
iter.err = 0;
|
|
iter.fn = nf_tables_loop_check_setelem;
|
|
|
|
set->ops->walk(ctx, set, &iter);
|
|
if (iter.err < 0)
|
|
return iter.err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nft_parse_u32_check - fetch u32 attribute and check for maximum value
|
|
*
|
|
* @attr: netlink attribute to fetch value from
|
|
* @max: maximum value to be stored in dest
|
|
* @dest: pointer to the variable
|
|
*
|
|
* Parse, check and store a given u32 netlink attribute into variable.
|
|
* This function returns -ERANGE if the value goes over maximum value.
|
|
* Otherwise a 0 is returned and the attribute value is stored in the
|
|
* destination variable.
|
|
*/
|
|
int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
|
|
{
|
|
u32 val;
|
|
|
|
val = ntohl(nla_get_be32(attr));
|
|
if (val > max)
|
|
return -ERANGE;
|
|
|
|
*dest = val;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_parse_u32_check);
|
|
|
|
/**
|
|
* nft_parse_register - parse a register value from a netlink attribute
|
|
*
|
|
* @attr: netlink attribute
|
|
*
|
|
* Parse and translate a register value from a netlink attribute.
|
|
* Registers used to be 128 bit wide, these register numbers will be
|
|
* mapped to the corresponding 32 bit register numbers.
|
|
*/
|
|
unsigned int nft_parse_register(const struct nlattr *attr)
|
|
{
|
|
unsigned int reg;
|
|
|
|
reg = ntohl(nla_get_be32(attr));
|
|
switch (reg) {
|
|
case NFT_REG_VERDICT...NFT_REG_4:
|
|
return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
|
|
default:
|
|
return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_parse_register);
|
|
|
|
/**
|
|
* nft_dump_register - dump a register value to a netlink attribute
|
|
*
|
|
* @skb: socket buffer
|
|
* @attr: attribute number
|
|
* @reg: register number
|
|
*
|
|
* Construct a netlink attribute containing the register number. For
|
|
* compatibility reasons, register numbers being a multiple of 4 are
|
|
* translated to the corresponding 128 bit register numbers.
|
|
*/
|
|
int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
|
|
{
|
|
if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
|
|
reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
|
|
else
|
|
reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
|
|
|
|
return nla_put_be32(skb, attr, htonl(reg));
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_dump_register);
|
|
|
|
/**
|
|
* nft_validate_register_load - validate a load from a register
|
|
*
|
|
* @reg: the register number
|
|
* @len: the length of the data
|
|
*
|
|
* Validate that the input register is one of the general purpose
|
|
* registers and that the length of the load is within the bounds.
|
|
*/
|
|
int nft_validate_register_load(enum nft_registers reg, unsigned int len)
|
|
{
|
|
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
|
|
return -EINVAL;
|
|
if (len == 0)
|
|
return -EINVAL;
|
|
if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
|
|
return -ERANGE;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_validate_register_load);
|
|
|
|
/**
|
|
* nft_validate_register_store - validate an expressions' register store
|
|
*
|
|
* @ctx: context of the expression performing the load
|
|
* @reg: the destination register number
|
|
* @data: the data to load
|
|
* @type: the data type
|
|
* @len: the length of the data
|
|
*
|
|
* Validate that a data load uses the appropriate data type for
|
|
* the destination register and the length is within the bounds.
|
|
* A value of NULL for the data means that its runtime gathered
|
|
* data.
|
|
*/
|
|
int nft_validate_register_store(const struct nft_ctx *ctx,
|
|
enum nft_registers reg,
|
|
const struct nft_data *data,
|
|
enum nft_data_types type, unsigned int len)
|
|
{
|
|
int err;
|
|
|
|
switch (reg) {
|
|
case NFT_REG_VERDICT:
|
|
if (type != NFT_DATA_VERDICT)
|
|
return -EINVAL;
|
|
|
|
if (data != NULL &&
|
|
(data->verdict.code == NFT_GOTO ||
|
|
data->verdict.code == NFT_JUMP)) {
|
|
err = nf_tables_check_loops(ctx, data->verdict.chain);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (ctx->chain->level + 1 >
|
|
data->verdict.chain->level) {
|
|
if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
|
|
return -EMLINK;
|
|
data->verdict.chain->level = ctx->chain->level + 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
default:
|
|
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
|
|
return -EINVAL;
|
|
if (len == 0)
|
|
return -EINVAL;
|
|
if (reg * NFT_REG32_SIZE + len >
|
|
FIELD_SIZEOF(struct nft_regs, data))
|
|
return -ERANGE;
|
|
|
|
if (data != NULL && type != NFT_DATA_VALUE)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_validate_register_store);
|
|
|
|
static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
|
|
[NFTA_VERDICT_CODE] = { .type = NLA_U32 },
|
|
[NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
|
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
|
};
|
|
|
|
static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
|
|
struct nft_data_desc *desc, const struct nlattr *nla)
|
|
{
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nlattr *tb[NFTA_VERDICT_MAX + 1];
|
|
struct nft_chain *chain;
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[NFTA_VERDICT_CODE])
|
|
return -EINVAL;
|
|
data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
|
|
|
|
switch (data->verdict.code) {
|
|
default:
|
|
switch (data->verdict.code & NF_VERDICT_MASK) {
|
|
case NF_ACCEPT:
|
|
case NF_DROP:
|
|
case NF_QUEUE:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
/* fall through */
|
|
case NFT_CONTINUE:
|
|
case NFT_BREAK:
|
|
case NFT_RETURN:
|
|
break;
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
if (!tb[NFTA_VERDICT_CHAIN])
|
|
return -EINVAL;
|
|
chain = nf_tables_chain_lookup(ctx->table,
|
|
tb[NFTA_VERDICT_CHAIN], genmask);
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
if (chain->flags & NFT_BASE_CHAIN)
|
|
return -EOPNOTSUPP;
|
|
|
|
chain->use++;
|
|
data->verdict.chain = chain;
|
|
break;
|
|
}
|
|
|
|
desc->len = sizeof(data->verdict);
|
|
desc->type = NFT_DATA_VERDICT;
|
|
return 0;
|
|
}
|
|
|
|
static void nft_verdict_uninit(const struct nft_data *data)
|
|
{
|
|
switch (data->verdict.code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
data->verdict.chain->use--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start(skb, type);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
|
|
goto nla_put_failure;
|
|
|
|
switch (v->code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
|
|
v->chain->name))
|
|
goto nla_put_failure;
|
|
}
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int nft_value_init(const struct nft_ctx *ctx,
|
|
struct nft_data *data, unsigned int size,
|
|
struct nft_data_desc *desc, const struct nlattr *nla)
|
|
{
|
|
unsigned int len;
|
|
|
|
len = nla_len(nla);
|
|
if (len == 0)
|
|
return -EINVAL;
|
|
if (len > size)
|
|
return -EOVERFLOW;
|
|
|
|
nla_memcpy(data->data, nla, len);
|
|
desc->type = NFT_DATA_VALUE;
|
|
desc->len = len;
|
|
return 0;
|
|
}
|
|
|
|
static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
|
|
unsigned int len)
|
|
{
|
|
return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
|
|
}
|
|
|
|
static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
|
|
[NFTA_DATA_VALUE] = { .type = NLA_BINARY },
|
|
[NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
/**
|
|
* nft_data_init - parse nf_tables data netlink attributes
|
|
*
|
|
* @ctx: context of the expression using the data
|
|
* @data: destination struct nft_data
|
|
* @size: maximum data length
|
|
* @desc: data description
|
|
* @nla: netlink attribute containing data
|
|
*
|
|
* Parse the netlink data attributes and initialize a struct nft_data.
|
|
* The type and length of data are returned in the data description.
|
|
*
|
|
* The caller can indicate that it only wants to accept data of type
|
|
* NFT_DATA_VALUE by passing NULL for the ctx argument.
|
|
*/
|
|
int nft_data_init(const struct nft_ctx *ctx,
|
|
struct nft_data *data, unsigned int size,
|
|
struct nft_data_desc *desc, const struct nlattr *nla)
|
|
{
|
|
struct nlattr *tb[NFTA_DATA_MAX + 1];
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[NFTA_DATA_VALUE])
|
|
return nft_value_init(ctx, data, size, desc,
|
|
tb[NFTA_DATA_VALUE]);
|
|
if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
|
|
return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_data_init);
|
|
|
|
/**
|
|
* nft_data_uninit - release a nft_data item
|
|
*
|
|
* @data: struct nft_data to release
|
|
* @type: type of data
|
|
*
|
|
* Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
|
|
* all others need to be released by calling this function.
|
|
*/
|
|
void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
|
|
{
|
|
if (type < NFT_DATA_VERDICT)
|
|
return;
|
|
switch (type) {
|
|
case NFT_DATA_VERDICT:
|
|
return nft_verdict_uninit(data);
|
|
default:
|
|
WARN_ON(1);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_data_uninit);
|
|
|
|
int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
|
|
enum nft_data_types type, unsigned int len)
|
|
{
|
|
struct nlattr *nest;
|
|
int err;
|
|
|
|
nest = nla_nest_start(skb, attr);
|
|
if (nest == NULL)
|
|
return -1;
|
|
|
|
switch (type) {
|
|
case NFT_DATA_VALUE:
|
|
err = nft_value_dump(skb, data, len);
|
|
break;
|
|
case NFT_DATA_VERDICT:
|
|
err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
WARN_ON(1);
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_data_dump);
|
|
|
|
static int __net_init nf_tables_init_net(struct net *net)
|
|
{
|
|
INIT_LIST_HEAD(&net->nft.af_info);
|
|
INIT_LIST_HEAD(&net->nft.commit_list);
|
|
net->nft.base_seq = 1;
|
|
return 0;
|
|
}
|
|
|
|
int __nft_release_basechain(struct nft_ctx *ctx)
|
|
{
|
|
struct nft_rule *rule, *nr;
|
|
|
|
BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
|
|
|
|
nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
|
|
ctx->afi->nops);
|
|
list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
|
|
list_del(&rule->list);
|
|
ctx->chain->use--;
|
|
nf_tables_rule_destroy(ctx, rule);
|
|
}
|
|
list_del(&ctx->chain->list);
|
|
ctx->table->use--;
|
|
nf_tables_chain_destroy(ctx->chain);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__nft_release_basechain);
|
|
|
|
/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
|
|
static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
|
|
{
|
|
struct nft_table *table, *nt;
|
|
struct nft_chain *chain, *nc;
|
|
struct nft_object *obj, *ne;
|
|
struct nft_rule *rule, *nr;
|
|
struct nft_set *set, *ns;
|
|
struct nft_ctx ctx = {
|
|
.net = net,
|
|
.afi = afi,
|
|
};
|
|
|
|
list_for_each_entry_safe(table, nt, &afi->tables, list) {
|
|
list_for_each_entry(chain, &table->chains, list)
|
|
nf_tables_unregister_hooks(net, table, chain,
|
|
afi->nops);
|
|
/* No packets are walking on these chains anymore. */
|
|
ctx.table = table;
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
ctx.chain = chain;
|
|
list_for_each_entry_safe(rule, nr, &chain->rules, list) {
|
|
list_del(&rule->list);
|
|
chain->use--;
|
|
nf_tables_rule_destroy(&ctx, rule);
|
|
}
|
|
}
|
|
list_for_each_entry_safe(set, ns, &table->sets, list) {
|
|
list_del(&set->list);
|
|
table->use--;
|
|
nft_set_destroy(set);
|
|
}
|
|
list_for_each_entry_safe(obj, ne, &table->objects, list) {
|
|
list_del(&obj->list);
|
|
table->use--;
|
|
nft_obj_destroy(obj);
|
|
}
|
|
list_for_each_entry_safe(chain, nc, &table->chains, list) {
|
|
list_del(&chain->list);
|
|
table->use--;
|
|
nf_tables_chain_destroy(chain);
|
|
}
|
|
list_del(&table->list);
|
|
nf_tables_table_destroy(&ctx);
|
|
}
|
|
}
|
|
|
|
static struct pernet_operations nf_tables_net_ops = {
|
|
.init = nf_tables_init_net,
|
|
};
|
|
|
|
static int __init nf_tables_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
|
|
GFP_KERNEL);
|
|
if (info == NULL) {
|
|
err = -ENOMEM;
|
|
goto err1;
|
|
}
|
|
|
|
err = nf_tables_core_module_init();
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
err = nfnetlink_subsys_register(&nf_tables_subsys);
|
|
if (err < 0)
|
|
goto err3;
|
|
|
|
pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
|
|
return register_pernet_subsys(&nf_tables_net_ops);
|
|
err3:
|
|
nf_tables_core_module_exit();
|
|
err2:
|
|
kfree(info);
|
|
err1:
|
|
return err;
|
|
}
|
|
|
|
static void __exit nf_tables_module_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&nf_tables_net_ops);
|
|
nfnetlink_subsys_unregister(&nf_tables_subsys);
|
|
rcu_barrier();
|
|
nf_tables_core_module_exit();
|
|
kfree(info);
|
|
}
|
|
|
|
module_init(nf_tables_module_init);
|
|
module_exit(nf_tables_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
|