// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_acct.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_ecache.h>
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#include <net/netfilter/nf_conntrack_labels.h>
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#include <net/netfilter/nf_conntrack_timeout.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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#include <net/netfilter/nf_conntrack_expect.h>
|
|
struct nft_ct {
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enum nft_ct_keys key:8;
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enum ip_conntrack_dir dir:8;
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union {
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u8 dreg;
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u8 sreg;
|
};
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};
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struct nft_ct_helper_obj {
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struct nf_conntrack_helper *helper4;
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struct nf_conntrack_helper *helper6;
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u8 l4proto;
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};
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|
#ifdef CONFIG_NF_CONNTRACK_ZONES
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static DEFINE_PER_CPU(struct nf_conn *, nft_ct_pcpu_template);
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static unsigned int nft_ct_pcpu_template_refcnt __read_mostly;
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static DEFINE_MUTEX(nft_ct_pcpu_mutex);
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#endif
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static u64 nft_ct_get_eval_counter(const struct nf_conn_counter *c,
|
enum nft_ct_keys k,
|
enum ip_conntrack_dir d)
|
{
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if (d < IP_CT_DIR_MAX)
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return k == NFT_CT_BYTES ? atomic64_read(&c[d].bytes) :
|
atomic64_read(&c[d].packets);
|
|
return nft_ct_get_eval_counter(c, k, IP_CT_DIR_ORIGINAL) +
|
nft_ct_get_eval_counter(c, k, IP_CT_DIR_REPLY);
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}
|
|
static void nft_ct_get_eval(const struct nft_expr *expr,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
const struct nft_ct *priv = nft_expr_priv(expr);
|
u32 *dest = ®s->data[priv->dreg];
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enum ip_conntrack_info ctinfo;
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const struct nf_conn *ct;
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const struct nf_conn_help *help;
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const struct nf_conntrack_tuple *tuple;
|
const struct nf_conntrack_helper *helper;
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unsigned int state;
|
|
ct = nf_ct_get(pkt->skb, &ctinfo);
|
|
switch (priv->key) {
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case NFT_CT_STATE:
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if (ct)
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state = NF_CT_STATE_BIT(ctinfo);
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else if (ctinfo == IP_CT_UNTRACKED)
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state = NF_CT_STATE_UNTRACKED_BIT;
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else
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state = NF_CT_STATE_INVALID_BIT;
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*dest = state;
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return;
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default:
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break;
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}
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if (ct == NULL)
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goto err;
|
|
switch (priv->key) {
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case NFT_CT_DIRECTION:
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nft_reg_store8(dest, CTINFO2DIR(ctinfo));
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return;
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case NFT_CT_STATUS:
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*dest = ct->status;
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return;
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#ifdef CONFIG_NF_CONNTRACK_MARK
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case NFT_CT_MARK:
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*dest = READ_ONCE(ct->mark);
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return;
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#endif
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
case NFT_CT_SECMARK:
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*dest = ct->secmark;
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return;
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#endif
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case NFT_CT_EXPIRATION:
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*dest = jiffies_to_msecs(nf_ct_expires(ct));
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return;
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case NFT_CT_HELPER:
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if (ct->master == NULL)
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goto err;
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help = nfct_help(ct->master);
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if (help == NULL)
|
goto err;
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helper = rcu_dereference(help->helper);
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if (helper == NULL)
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goto err;
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strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN);
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return;
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#ifdef CONFIG_NF_CONNTRACK_LABELS
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case NFT_CT_LABELS: {
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struct nf_conn_labels *labels = nf_ct_labels_find(ct);
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if (labels)
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memcpy(dest, labels->bits, NF_CT_LABELS_MAX_SIZE);
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else
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memset(dest, 0, NF_CT_LABELS_MAX_SIZE);
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return;
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}
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#endif
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case NFT_CT_BYTES:
|
case NFT_CT_PKTS: {
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const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
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u64 count = 0;
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if (acct)
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count = nft_ct_get_eval_counter(acct->counter,
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priv->key, priv->dir);
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memcpy(dest, &count, sizeof(count));
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return;
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}
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case NFT_CT_AVGPKT: {
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const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
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u64 avgcnt = 0, bcnt = 0, pcnt = 0;
|
|
if (acct) {
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pcnt = nft_ct_get_eval_counter(acct->counter,
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NFT_CT_PKTS, priv->dir);
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bcnt = nft_ct_get_eval_counter(acct->counter,
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NFT_CT_BYTES, priv->dir);
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if (pcnt != 0)
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avgcnt = div64_u64(bcnt, pcnt);
|
}
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memcpy(dest, &avgcnt, sizeof(avgcnt));
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return;
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}
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case NFT_CT_L3PROTOCOL:
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nft_reg_store8(dest, nf_ct_l3num(ct));
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return;
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case NFT_CT_PROTOCOL:
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nft_reg_store8(dest, nf_ct_protonum(ct));
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return;
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#ifdef CONFIG_NF_CONNTRACK_ZONES
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case NFT_CT_ZONE: {
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const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
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u16 zoneid;
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if (priv->dir < IP_CT_DIR_MAX)
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zoneid = nf_ct_zone_id(zone, priv->dir);
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else
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zoneid = zone->id;
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nft_reg_store16(dest, zoneid);
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return;
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}
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#endif
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case NFT_CT_ID:
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*dest = nf_ct_get_id(ct);
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return;
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default:
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break;
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}
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tuple = &ct->tuplehash[priv->dir].tuple;
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switch (priv->key) {
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case NFT_CT_SRC:
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memcpy(dest, tuple->src.u3.all,
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nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
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return;
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case NFT_CT_DST:
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memcpy(dest, tuple->dst.u3.all,
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nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
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return;
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case NFT_CT_PROTO_SRC:
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nft_reg_store16(dest, (__force u16)tuple->src.u.all);
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return;
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case NFT_CT_PROTO_DST:
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nft_reg_store16(dest, (__force u16)tuple->dst.u.all);
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return;
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case NFT_CT_SRC_IP:
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if (nf_ct_l3num(ct) != NFPROTO_IPV4)
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goto err;
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*dest = tuple->src.u3.ip;
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return;
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case NFT_CT_DST_IP:
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if (nf_ct_l3num(ct) != NFPROTO_IPV4)
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goto err;
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*dest = tuple->dst.u3.ip;
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return;
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case NFT_CT_SRC_IP6:
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if (nf_ct_l3num(ct) != NFPROTO_IPV6)
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goto err;
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memcpy(dest, tuple->src.u3.ip6, sizeof(struct in6_addr));
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return;
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case NFT_CT_DST_IP6:
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if (nf_ct_l3num(ct) != NFPROTO_IPV6)
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goto err;
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memcpy(dest, tuple->dst.u3.ip6, sizeof(struct in6_addr));
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return;
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default:
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break;
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}
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return;
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err:
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regs->verdict.code = NFT_BREAK;
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}
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#ifdef CONFIG_NF_CONNTRACK_ZONES
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static void nft_ct_set_zone_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nf_conntrack_zone zone = { .dir = NF_CT_DEFAULT_ZONE_DIR };
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const struct nft_ct *priv = nft_expr_priv(expr);
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struct sk_buff *skb = pkt->skb;
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enum ip_conntrack_info ctinfo;
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u16 value = nft_reg_load16(®s->data[priv->sreg]);
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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if (ct) /* already tracked */
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return;
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zone.id = value;
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switch (priv->dir) {
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case IP_CT_DIR_ORIGINAL:
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zone.dir = NF_CT_ZONE_DIR_ORIG;
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break;
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case IP_CT_DIR_REPLY:
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zone.dir = NF_CT_ZONE_DIR_REPL;
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break;
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default:
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break;
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}
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ct = this_cpu_read(nft_ct_pcpu_template);
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if (likely(atomic_read(&ct->ct_general.use) == 1)) {
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nf_ct_zone_add(ct, &zone);
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} else {
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/* previous skb got queued to userspace */
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ct = nf_ct_tmpl_alloc(nft_net(pkt), &zone, GFP_ATOMIC);
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if (!ct) {
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regs->verdict.code = NF_DROP;
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return;
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}
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}
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atomic_inc(&ct->ct_general.use);
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nf_ct_set(skb, ct, IP_CT_NEW);
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}
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#endif
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static void nft_ct_set_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_ct *priv = nft_expr_priv(expr);
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struct sk_buff *skb = pkt->skb;
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#if defined(CONFIG_NF_CONNTRACK_MARK) || defined(CONFIG_NF_CONNTRACK_SECMARK)
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u32 value = regs->data[priv->sreg];
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#endif
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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if (ct == NULL || nf_ct_is_template(ct))
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return;
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switch (priv->key) {
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#ifdef CONFIG_NF_CONNTRACK_MARK
|
case NFT_CT_MARK:
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if (READ_ONCE(ct->mark) != value) {
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WRITE_ONCE(ct->mark, value);
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nf_conntrack_event_cache(IPCT_MARK, ct);
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}
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break;
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#endif
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
case NFT_CT_SECMARK:
|
if (ct->secmark != value) {
|
ct->secmark = value;
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nf_conntrack_event_cache(IPCT_SECMARK, ct);
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}
|
break;
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#endif
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#ifdef CONFIG_NF_CONNTRACK_LABELS
|
case NFT_CT_LABELS:
|
nf_connlabels_replace(ct,
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®s->data[priv->sreg],
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®s->data[priv->sreg],
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NF_CT_LABELS_MAX_SIZE / sizeof(u32));
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break;
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#endif
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#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
case NFT_CT_EVENTMASK: {
|
struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct);
|
u32 ctmask = regs->data[priv->sreg];
|
|
if (e) {
|
if (e->ctmask != ctmask)
|
e->ctmask = ctmask;
|
break;
|
}
|
|
if (ctmask && !nf_ct_is_confirmed(ct))
|
nf_ct_ecache_ext_add(ct, ctmask, 0, GFP_ATOMIC);
|
break;
|
}
|
#endif
|
default:
|
break;
|
}
|
}
|
|
static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
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[NFTA_CT_DREG] = { .type = NLA_U32 },
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[NFTA_CT_KEY] = { .type = NLA_U32 },
|
[NFTA_CT_DIRECTION] = { .type = NLA_U8 },
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[NFTA_CT_SREG] = { .type = NLA_U32 },
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};
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|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
static void nft_ct_tmpl_put_pcpu(void)
|
{
|
struct nf_conn *ct;
|
int cpu;
|
|
for_each_possible_cpu(cpu) {
|
ct = per_cpu(nft_ct_pcpu_template, cpu);
|
if (!ct)
|
break;
|
nf_ct_put(ct);
|
per_cpu(nft_ct_pcpu_template, cpu) = NULL;
|
}
|
}
|
|
static bool nft_ct_tmpl_alloc_pcpu(void)
|
{
|
struct nf_conntrack_zone zone = { .id = 0 };
|
struct nf_conn *tmp;
|
int cpu;
|
|
if (nft_ct_pcpu_template_refcnt)
|
return true;
|
|
for_each_possible_cpu(cpu) {
|
tmp = nf_ct_tmpl_alloc(&init_net, &zone, GFP_KERNEL);
|
if (!tmp) {
|
nft_ct_tmpl_put_pcpu();
|
return false;
|
}
|
|
atomic_set(&tmp->ct_general.use, 1);
|
per_cpu(nft_ct_pcpu_template, cpu) = tmp;
|
}
|
|
return true;
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}
|
#endif
|
|
static int nft_ct_get_init(const struct nft_ctx *ctx,
|
const struct nft_expr *expr,
|
const struct nlattr * const tb[])
|
{
|
struct nft_ct *priv = nft_expr_priv(expr);
|
unsigned int len;
|
int err;
|
|
priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
|
priv->dir = IP_CT_DIR_MAX;
|
switch (priv->key) {
|
case NFT_CT_DIRECTION:
|
if (tb[NFTA_CT_DIRECTION] != NULL)
|
return -EINVAL;
|
len = sizeof(u8);
|
break;
|
case NFT_CT_STATE:
|
case NFT_CT_STATUS:
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
case NFT_CT_MARK:
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
case NFT_CT_SECMARK:
|
#endif
|
case NFT_CT_EXPIRATION:
|
if (tb[NFTA_CT_DIRECTION] != NULL)
|
return -EINVAL;
|
len = sizeof(u32);
|
break;
|
#ifdef CONFIG_NF_CONNTRACK_LABELS
|
case NFT_CT_LABELS:
|
if (tb[NFTA_CT_DIRECTION] != NULL)
|
return -EINVAL;
|
len = NF_CT_LABELS_MAX_SIZE;
|
break;
|
#endif
|
case NFT_CT_HELPER:
|
if (tb[NFTA_CT_DIRECTION] != NULL)
|
return -EINVAL;
|
len = NF_CT_HELPER_NAME_LEN;
|
break;
|
|
case NFT_CT_L3PROTOCOL:
|
case NFT_CT_PROTOCOL:
|
/* For compatibility, do not report error if NFTA_CT_DIRECTION
|
* attribute is specified.
|
*/
|
len = sizeof(u8);
|
break;
|
case NFT_CT_SRC:
|
case NFT_CT_DST:
|
if (tb[NFTA_CT_DIRECTION] == NULL)
|
return -EINVAL;
|
|
switch (ctx->family) {
|
case NFPROTO_IPV4:
|
len = sizeof_field(struct nf_conntrack_tuple,
|
src.u3.ip);
|
break;
|
case NFPROTO_IPV6:
|
case NFPROTO_INET:
|
len = sizeof_field(struct nf_conntrack_tuple,
|
src.u3.ip6);
|
break;
|
default:
|
return -EAFNOSUPPORT;
|
}
|
break;
|
case NFT_CT_SRC_IP:
|
case NFT_CT_DST_IP:
|
if (tb[NFTA_CT_DIRECTION] == NULL)
|
return -EINVAL;
|
|
len = sizeof_field(struct nf_conntrack_tuple, src.u3.ip);
|
break;
|
case NFT_CT_SRC_IP6:
|
case NFT_CT_DST_IP6:
|
if (tb[NFTA_CT_DIRECTION] == NULL)
|
return -EINVAL;
|
|
len = sizeof_field(struct nf_conntrack_tuple, src.u3.ip6);
|
break;
|
case NFT_CT_PROTO_SRC:
|
case NFT_CT_PROTO_DST:
|
if (tb[NFTA_CT_DIRECTION] == NULL)
|
return -EINVAL;
|
len = sizeof_field(struct nf_conntrack_tuple, src.u.all);
|
break;
|
case NFT_CT_BYTES:
|
case NFT_CT_PKTS:
|
case NFT_CT_AVGPKT:
|
len = sizeof(u64);
|
break;
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
case NFT_CT_ZONE:
|
len = sizeof(u16);
|
break;
|
#endif
|
case NFT_CT_ID:
|
len = sizeof(u32);
|
break;
|
default:
|
return -EOPNOTSUPP;
|
}
|
|
if (tb[NFTA_CT_DIRECTION] != NULL) {
|
priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
|
switch (priv->dir) {
|
case IP_CT_DIR_ORIGINAL:
|
case IP_CT_DIR_REPLY:
|
break;
|
default:
|
return -EINVAL;
|
}
|
}
|
|
err = nft_parse_register_store(ctx, tb[NFTA_CT_DREG], &priv->dreg, NULL,
|
NFT_DATA_VALUE, len);
|
if (err < 0)
|
return err;
|
|
err = nf_ct_netns_get(ctx->net, ctx->family);
|
if (err < 0)
|
return err;
|
|
if (priv->key == NFT_CT_BYTES ||
|
priv->key == NFT_CT_PKTS ||
|
priv->key == NFT_CT_AVGPKT)
|
nf_ct_set_acct(ctx->net, true);
|
|
return 0;
|
}
|
|
static void __nft_ct_set_destroy(const struct nft_ctx *ctx, struct nft_ct *priv)
|
{
|
switch (priv->key) {
|
#ifdef CONFIG_NF_CONNTRACK_LABELS
|
case NFT_CT_LABELS:
|
nf_connlabels_put(ctx->net);
|
break;
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
case NFT_CT_ZONE:
|
mutex_lock(&nft_ct_pcpu_mutex);
|
if (--nft_ct_pcpu_template_refcnt == 0)
|
nft_ct_tmpl_put_pcpu();
|
mutex_unlock(&nft_ct_pcpu_mutex);
|
break;
|
#endif
|
default:
|
break;
|
}
|
}
|
|
static int nft_ct_set_init(const struct nft_ctx *ctx,
|
const struct nft_expr *expr,
|
const struct nlattr * const tb[])
|
{
|
struct nft_ct *priv = nft_expr_priv(expr);
|
unsigned int len;
|
int err;
|
|
priv->dir = IP_CT_DIR_MAX;
|
priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
|
switch (priv->key) {
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
case NFT_CT_MARK:
|
if (tb[NFTA_CT_DIRECTION])
|
return -EINVAL;
|
len = sizeof_field(struct nf_conn, mark);
|
break;
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_LABELS
|
case NFT_CT_LABELS:
|
if (tb[NFTA_CT_DIRECTION])
|
return -EINVAL;
|
len = NF_CT_LABELS_MAX_SIZE;
|
err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1);
|
if (err)
|
return err;
|
break;
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
case NFT_CT_ZONE:
|
mutex_lock(&nft_ct_pcpu_mutex);
|
if (!nft_ct_tmpl_alloc_pcpu()) {
|
mutex_unlock(&nft_ct_pcpu_mutex);
|
return -ENOMEM;
|
}
|
nft_ct_pcpu_template_refcnt++;
|
mutex_unlock(&nft_ct_pcpu_mutex);
|
len = sizeof(u16);
|
break;
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
case NFT_CT_EVENTMASK:
|
if (tb[NFTA_CT_DIRECTION])
|
return -EINVAL;
|
len = sizeof(u32);
|
break;
|
#endif
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
case NFT_CT_SECMARK:
|
if (tb[NFTA_CT_DIRECTION])
|
return -EINVAL;
|
len = sizeof(u32);
|
break;
|
#endif
|
default:
|
return -EOPNOTSUPP;
|
}
|
|
if (tb[NFTA_CT_DIRECTION]) {
|
priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
|
switch (priv->dir) {
|
case IP_CT_DIR_ORIGINAL:
|
case IP_CT_DIR_REPLY:
|
break;
|
default:
|
err = -EINVAL;
|
goto err1;
|
}
|
}
|
|
err = nft_parse_register_load(tb[NFTA_CT_SREG], &priv->sreg, len);
|
if (err < 0)
|
goto err1;
|
|
err = nf_ct_netns_get(ctx->net, ctx->family);
|
if (err < 0)
|
goto err1;
|
|
return 0;
|
|
err1:
|
__nft_ct_set_destroy(ctx, priv);
|
return err;
|
}
|
|
static void nft_ct_get_destroy(const struct nft_ctx *ctx,
|
const struct nft_expr *expr)
|
{
|
nf_ct_netns_put(ctx->net, ctx->family);
|
}
|
|
static void nft_ct_set_destroy(const struct nft_ctx *ctx,
|
const struct nft_expr *expr)
|
{
|
struct nft_ct *priv = nft_expr_priv(expr);
|
|
__nft_ct_set_destroy(ctx, priv);
|
nf_ct_netns_put(ctx->net, ctx->family);
|
}
|
|
static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
{
|
const struct nft_ct *priv = nft_expr_priv(expr);
|
|
if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
|
goto nla_put_failure;
|
if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
|
goto nla_put_failure;
|
|
switch (priv->key) {
|
case NFT_CT_SRC:
|
case NFT_CT_DST:
|
case NFT_CT_SRC_IP:
|
case NFT_CT_DST_IP:
|
case NFT_CT_SRC_IP6:
|
case NFT_CT_DST_IP6:
|
case NFT_CT_PROTO_SRC:
|
case NFT_CT_PROTO_DST:
|
if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
|
goto nla_put_failure;
|
break;
|
case NFT_CT_BYTES:
|
case NFT_CT_PKTS:
|
case NFT_CT_AVGPKT:
|
case NFT_CT_ZONE:
|
if (priv->dir < IP_CT_DIR_MAX &&
|
nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
|
goto nla_put_failure;
|
break;
|
default:
|
break;
|
}
|
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
{
|
const struct nft_ct *priv = nft_expr_priv(expr);
|
|
if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
|
goto nla_put_failure;
|
if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
|
goto nla_put_failure;
|
|
switch (priv->key) {
|
case NFT_CT_ZONE:
|
if (priv->dir < IP_CT_DIR_MAX &&
|
nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
|
goto nla_put_failure;
|
break;
|
default:
|
break;
|
}
|
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
static struct nft_expr_type nft_ct_type;
|
static const struct nft_expr_ops nft_ct_get_ops = {
|
.type = &nft_ct_type,
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
|
.eval = nft_ct_get_eval,
|
.init = nft_ct_get_init,
|
.destroy = nft_ct_get_destroy,
|
.dump = nft_ct_get_dump,
|
};
|
|
static const struct nft_expr_ops nft_ct_set_ops = {
|
.type = &nft_ct_type,
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
|
.eval = nft_ct_set_eval,
|
.init = nft_ct_set_init,
|
.destroy = nft_ct_set_destroy,
|
.dump = nft_ct_set_dump,
|
};
|
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
static const struct nft_expr_ops nft_ct_set_zone_ops = {
|
.type = &nft_ct_type,
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
|
.eval = nft_ct_set_zone_eval,
|
.init = nft_ct_set_init,
|
.destroy = nft_ct_set_destroy,
|
.dump = nft_ct_set_dump,
|
};
|
#endif
|
|
static const struct nft_expr_ops *
|
nft_ct_select_ops(const struct nft_ctx *ctx,
|
const struct nlattr * const tb[])
|
{
|
if (tb[NFTA_CT_KEY] == NULL)
|
return ERR_PTR(-EINVAL);
|
|
if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
|
return ERR_PTR(-EINVAL);
|
|
if (tb[NFTA_CT_DREG])
|
return &nft_ct_get_ops;
|
|
if (tb[NFTA_CT_SREG]) {
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
if (nla_get_be32(tb[NFTA_CT_KEY]) == htonl(NFT_CT_ZONE))
|
return &nft_ct_set_zone_ops;
|
#endif
|
return &nft_ct_set_ops;
|
}
|
|
return ERR_PTR(-EINVAL);
|
}
|
|
static struct nft_expr_type nft_ct_type __read_mostly = {
|
.name = "ct",
|
.select_ops = nft_ct_select_ops,
|
.policy = nft_ct_policy,
|
.maxattr = NFTA_CT_MAX,
|
.owner = THIS_MODULE,
|
};
|
|
static void nft_notrack_eval(const struct nft_expr *expr,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
struct sk_buff *skb = pkt->skb;
|
enum ip_conntrack_info ctinfo;
|
struct nf_conn *ct;
|
|
ct = nf_ct_get(pkt->skb, &ctinfo);
|
/* Previously seen (loopback or untracked)? Ignore. */
|
if (ct || ctinfo == IP_CT_UNTRACKED)
|
return;
|
|
nf_ct_set(skb, ct, IP_CT_UNTRACKED);
|
}
|
|
static struct nft_expr_type nft_notrack_type;
|
static const struct nft_expr_ops nft_notrack_ops = {
|
.type = &nft_notrack_type,
|
.size = NFT_EXPR_SIZE(0),
|
.eval = nft_notrack_eval,
|
};
|
|
static struct nft_expr_type nft_notrack_type __read_mostly = {
|
.name = "notrack",
|
.ops = &nft_notrack_ops,
|
.owner = THIS_MODULE,
|
};
|
|
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
|
static int
|
nft_ct_timeout_parse_policy(void *timeouts,
|
const struct nf_conntrack_l4proto *l4proto,
|
struct net *net, const struct nlattr *attr)
|
{
|
struct nlattr **tb;
|
int ret = 0;
|
|
tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb),
|
GFP_KERNEL);
|
|
if (!tb)
|
return -ENOMEM;
|
|
ret = nla_parse_nested_deprecated(tb,
|
l4proto->ctnl_timeout.nlattr_max,
|
attr,
|
l4proto->ctnl_timeout.nla_policy,
|
NULL);
|
if (ret < 0)
|
goto err;
|
|
ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
|
|
err:
|
kfree(tb);
|
return ret;
|
}
|
|
struct nft_ct_timeout_obj {
|
struct nf_ct_timeout *timeout;
|
u8 l4proto;
|
};
|
|
static void nft_ct_timeout_obj_eval(struct nft_object *obj,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
|
struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb);
|
struct nf_conn_timeout *timeout;
|
const unsigned int *values;
|
|
if (priv->l4proto != pkt->tprot)
|
return;
|
|
if (!ct || nf_ct_is_template(ct) || nf_ct_is_confirmed(ct))
|
return;
|
|
timeout = nf_ct_timeout_find(ct);
|
if (!timeout) {
|
timeout = nf_ct_timeout_ext_add(ct, priv->timeout, GFP_ATOMIC);
|
if (!timeout) {
|
regs->verdict.code = NF_DROP;
|
return;
|
}
|
}
|
|
rcu_assign_pointer(timeout->timeout, priv->timeout);
|
|
/* adjust the timeout as per 'new' state. ct is unconfirmed,
|
* so the current timestamp must not be added.
|
*/
|
values = nf_ct_timeout_data(timeout);
|
if (values)
|
nf_ct_refresh(ct, pkt->skb, values[0]);
|
}
|
|
static int nft_ct_timeout_obj_init(const struct nft_ctx *ctx,
|
const struct nlattr * const tb[],
|
struct nft_object *obj)
|
{
|
struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
|
const struct nf_conntrack_l4proto *l4proto;
|
struct nf_ct_timeout *timeout;
|
int l3num = ctx->family;
|
__u8 l4num;
|
int ret;
|
|
if (!tb[NFTA_CT_TIMEOUT_L4PROTO] ||
|
!tb[NFTA_CT_TIMEOUT_DATA])
|
return -EINVAL;
|
|
if (tb[NFTA_CT_TIMEOUT_L3PROTO])
|
l3num = ntohs(nla_get_be16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
|
|
l4num = nla_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
|
priv->l4proto = l4num;
|
|
l4proto = nf_ct_l4proto_find(l4num);
|
|
if (l4proto->l4proto != l4num) {
|
ret = -EOPNOTSUPP;
|
goto err_proto_put;
|
}
|
|
timeout = kzalloc(sizeof(struct nf_ct_timeout) +
|
l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
|
if (timeout == NULL) {
|
ret = -ENOMEM;
|
goto err_proto_put;
|
}
|
|
ret = nft_ct_timeout_parse_policy(&timeout->data, l4proto, ctx->net,
|
tb[NFTA_CT_TIMEOUT_DATA]);
|
if (ret < 0)
|
goto err_free_timeout;
|
|
timeout->l3num = l3num;
|
timeout->l4proto = l4proto;
|
|
ret = nf_ct_netns_get(ctx->net, ctx->family);
|
if (ret < 0)
|
goto err_free_timeout;
|
|
priv->timeout = timeout;
|
return 0;
|
|
err_free_timeout:
|
kfree(timeout);
|
err_proto_put:
|
return ret;
|
}
|
|
static void nft_ct_timeout_obj_destroy(const struct nft_ctx *ctx,
|
struct nft_object *obj)
|
{
|
struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
|
struct nf_ct_timeout *timeout = priv->timeout;
|
|
nf_ct_untimeout(ctx->net, timeout);
|
nf_ct_netns_put(ctx->net, ctx->family);
|
kfree(priv->timeout);
|
}
|
|
static int nft_ct_timeout_obj_dump(struct sk_buff *skb,
|
struct nft_object *obj, bool reset)
|
{
|
const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
|
const struct nf_ct_timeout *timeout = priv->timeout;
|
struct nlattr *nest_params;
|
int ret;
|
|
if (nla_put_u8(skb, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) ||
|
nla_put_be16(skb, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3num)))
|
return -1;
|
|
nest_params = nla_nest_start(skb, NFTA_CT_TIMEOUT_DATA);
|
if (!nest_params)
|
return -1;
|
|
ret = timeout->l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
|
if (ret < 0)
|
return -1;
|
nla_nest_end(skb, nest_params);
|
return 0;
|
}
|
|
static const struct nla_policy nft_ct_timeout_policy[NFTA_CT_TIMEOUT_MAX + 1] = {
|
[NFTA_CT_TIMEOUT_L3PROTO] = {.type = NLA_U16 },
|
[NFTA_CT_TIMEOUT_L4PROTO] = {.type = NLA_U8 },
|
[NFTA_CT_TIMEOUT_DATA] = {.type = NLA_NESTED },
|
};
|
|
static struct nft_object_type nft_ct_timeout_obj_type;
|
|
static const struct nft_object_ops nft_ct_timeout_obj_ops = {
|
.type = &nft_ct_timeout_obj_type,
|
.size = sizeof(struct nft_ct_timeout_obj),
|
.eval = nft_ct_timeout_obj_eval,
|
.init = nft_ct_timeout_obj_init,
|
.destroy = nft_ct_timeout_obj_destroy,
|
.dump = nft_ct_timeout_obj_dump,
|
};
|
|
static struct nft_object_type nft_ct_timeout_obj_type __read_mostly = {
|
.type = NFT_OBJECT_CT_TIMEOUT,
|
.ops = &nft_ct_timeout_obj_ops,
|
.maxattr = NFTA_CT_TIMEOUT_MAX,
|
.policy = nft_ct_timeout_policy,
|
.owner = THIS_MODULE,
|
};
|
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
|
|
static int nft_ct_helper_obj_init(const struct nft_ctx *ctx,
|
const struct nlattr * const tb[],
|
struct nft_object *obj)
|
{
|
struct nft_ct_helper_obj *priv = nft_obj_data(obj);
|
struct nf_conntrack_helper *help4, *help6;
|
char name[NF_CT_HELPER_NAME_LEN];
|
int family = ctx->family;
|
int err;
|
|
if (!tb[NFTA_CT_HELPER_NAME] || !tb[NFTA_CT_HELPER_L4PROTO])
|
return -EINVAL;
|
|
priv->l4proto = nla_get_u8(tb[NFTA_CT_HELPER_L4PROTO]);
|
if (!priv->l4proto)
|
return -ENOENT;
|
|
nla_strlcpy(name, tb[NFTA_CT_HELPER_NAME], sizeof(name));
|
|
if (tb[NFTA_CT_HELPER_L3PROTO])
|
family = ntohs(nla_get_be16(tb[NFTA_CT_HELPER_L3PROTO]));
|
|
help4 = NULL;
|
help6 = NULL;
|
|
switch (family) {
|
case NFPROTO_IPV4:
|
if (ctx->family == NFPROTO_IPV6)
|
return -EINVAL;
|
|
help4 = nf_conntrack_helper_try_module_get(name, family,
|
priv->l4proto);
|
break;
|
case NFPROTO_IPV6:
|
if (ctx->family == NFPROTO_IPV4)
|
return -EINVAL;
|
|
help6 = nf_conntrack_helper_try_module_get(name, family,
|
priv->l4proto);
|
break;
|
case NFPROTO_NETDEV:
|
case NFPROTO_BRIDGE:
|
case NFPROTO_INET:
|
help4 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV4,
|
priv->l4proto);
|
help6 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV6,
|
priv->l4proto);
|
break;
|
default:
|
return -EAFNOSUPPORT;
|
}
|
|
/* && is intentional; only error if INET found neither ipv4 or ipv6 */
|
if (!help4 && !help6)
|
return -ENOENT;
|
|
priv->helper4 = help4;
|
priv->helper6 = help6;
|
|
err = nf_ct_netns_get(ctx->net, ctx->family);
|
if (err < 0)
|
goto err_put_helper;
|
|
return 0;
|
|
err_put_helper:
|
if (priv->helper4)
|
nf_conntrack_helper_put(priv->helper4);
|
if (priv->helper6)
|
nf_conntrack_helper_put(priv->helper6);
|
return err;
|
}
|
|
static void nft_ct_helper_obj_destroy(const struct nft_ctx *ctx,
|
struct nft_object *obj)
|
{
|
struct nft_ct_helper_obj *priv = nft_obj_data(obj);
|
|
if (priv->helper4)
|
nf_conntrack_helper_put(priv->helper4);
|
if (priv->helper6)
|
nf_conntrack_helper_put(priv->helper6);
|
|
nf_ct_netns_put(ctx->net, ctx->family);
|
}
|
|
static void nft_ct_helper_obj_eval(struct nft_object *obj,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
const struct nft_ct_helper_obj *priv = nft_obj_data(obj);
|
struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb);
|
struct nf_conntrack_helper *to_assign = NULL;
|
struct nf_conn_help *help;
|
|
if (!ct ||
|
nf_ct_is_confirmed(ct) ||
|
nf_ct_is_template(ct) ||
|
priv->l4proto != nf_ct_protonum(ct))
|
return;
|
|
switch (nf_ct_l3num(ct)) {
|
case NFPROTO_IPV4:
|
to_assign = priv->helper4;
|
break;
|
case NFPROTO_IPV6:
|
to_assign = priv->helper6;
|
break;
|
default:
|
WARN_ON_ONCE(1);
|
return;
|
}
|
|
if (!to_assign)
|
return;
|
|
if (test_bit(IPS_HELPER_BIT, &ct->status))
|
return;
|
|
help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
|
if (help) {
|
rcu_assign_pointer(help->helper, to_assign);
|
set_bit(IPS_HELPER_BIT, &ct->status);
|
}
|
}
|
|
static int nft_ct_helper_obj_dump(struct sk_buff *skb,
|
struct nft_object *obj, bool reset)
|
{
|
const struct nft_ct_helper_obj *priv = nft_obj_data(obj);
|
const struct nf_conntrack_helper *helper;
|
u16 family;
|
|
if (priv->helper4 && priv->helper6) {
|
family = NFPROTO_INET;
|
helper = priv->helper4;
|
} else if (priv->helper6) {
|
family = NFPROTO_IPV6;
|
helper = priv->helper6;
|
} else {
|
family = NFPROTO_IPV4;
|
helper = priv->helper4;
|
}
|
|
if (nla_put_string(skb, NFTA_CT_HELPER_NAME, helper->name))
|
return -1;
|
|
if (nla_put_u8(skb, NFTA_CT_HELPER_L4PROTO, priv->l4proto))
|
return -1;
|
|
if (nla_put_be16(skb, NFTA_CT_HELPER_L3PROTO, htons(family)))
|
return -1;
|
|
return 0;
|
}
|
|
static const struct nla_policy nft_ct_helper_policy[NFTA_CT_HELPER_MAX + 1] = {
|
[NFTA_CT_HELPER_NAME] = { .type = NLA_STRING,
|
.len = NF_CT_HELPER_NAME_LEN - 1 },
|
[NFTA_CT_HELPER_L3PROTO] = { .type = NLA_U16 },
|
[NFTA_CT_HELPER_L4PROTO] = { .type = NLA_U8 },
|
};
|
|
static struct nft_object_type nft_ct_helper_obj_type;
|
static const struct nft_object_ops nft_ct_helper_obj_ops = {
|
.type = &nft_ct_helper_obj_type,
|
.size = sizeof(struct nft_ct_helper_obj),
|
.eval = nft_ct_helper_obj_eval,
|
.init = nft_ct_helper_obj_init,
|
.destroy = nft_ct_helper_obj_destroy,
|
.dump = nft_ct_helper_obj_dump,
|
};
|
|
static struct nft_object_type nft_ct_helper_obj_type __read_mostly = {
|
.type = NFT_OBJECT_CT_HELPER,
|
.ops = &nft_ct_helper_obj_ops,
|
.maxattr = NFTA_CT_HELPER_MAX,
|
.policy = nft_ct_helper_policy,
|
.owner = THIS_MODULE,
|
};
|
|
struct nft_ct_expect_obj {
|
u16 l3num;
|
__be16 dport;
|
u8 l4proto;
|
u8 size;
|
u32 timeout;
|
};
|
|
static int nft_ct_expect_obj_init(const struct nft_ctx *ctx,
|
const struct nlattr * const tb[],
|
struct nft_object *obj)
|
{
|
struct nft_ct_expect_obj *priv = nft_obj_data(obj);
|
|
if (!tb[NFTA_CT_EXPECT_L4PROTO] ||
|
!tb[NFTA_CT_EXPECT_DPORT] ||
|
!tb[NFTA_CT_EXPECT_TIMEOUT] ||
|
!tb[NFTA_CT_EXPECT_SIZE])
|
return -EINVAL;
|
|
priv->l3num = ctx->family;
|
if (tb[NFTA_CT_EXPECT_L3PROTO])
|
priv->l3num = ntohs(nla_get_be16(tb[NFTA_CT_EXPECT_L3PROTO]));
|
|
priv->l4proto = nla_get_u8(tb[NFTA_CT_EXPECT_L4PROTO]);
|
priv->dport = nla_get_be16(tb[NFTA_CT_EXPECT_DPORT]);
|
priv->timeout = nla_get_u32(tb[NFTA_CT_EXPECT_TIMEOUT]);
|
priv->size = nla_get_u8(tb[NFTA_CT_EXPECT_SIZE]);
|
|
return nf_ct_netns_get(ctx->net, ctx->family);
|
}
|
|
static void nft_ct_expect_obj_destroy(const struct nft_ctx *ctx,
|
struct nft_object *obj)
|
{
|
nf_ct_netns_put(ctx->net, ctx->family);
|
}
|
|
static int nft_ct_expect_obj_dump(struct sk_buff *skb,
|
struct nft_object *obj, bool reset)
|
{
|
const struct nft_ct_expect_obj *priv = nft_obj_data(obj);
|
|
if (nla_put_be16(skb, NFTA_CT_EXPECT_L3PROTO, htons(priv->l3num)) ||
|
nla_put_u8(skb, NFTA_CT_EXPECT_L4PROTO, priv->l4proto) ||
|
nla_put_be16(skb, NFTA_CT_EXPECT_DPORT, priv->dport) ||
|
nla_put_u32(skb, NFTA_CT_EXPECT_TIMEOUT, priv->timeout) ||
|
nla_put_u8(skb, NFTA_CT_EXPECT_SIZE, priv->size))
|
return -1;
|
|
return 0;
|
}
|
|
static void nft_ct_expect_obj_eval(struct nft_object *obj,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
const struct nft_ct_expect_obj *priv = nft_obj_data(obj);
|
struct nf_conntrack_expect *exp;
|
enum ip_conntrack_info ctinfo;
|
struct nf_conn_help *help;
|
enum ip_conntrack_dir dir;
|
u16 l3num = priv->l3num;
|
struct nf_conn *ct;
|
|
ct = nf_ct_get(pkt->skb, &ctinfo);
|
if (!ct || nf_ct_is_confirmed(ct) || nf_ct_is_template(ct)) {
|
regs->verdict.code = NFT_BREAK;
|
return;
|
}
|
dir = CTINFO2DIR(ctinfo);
|
|
help = nfct_help(ct);
|
if (!help)
|
help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
|
if (!help) {
|
regs->verdict.code = NF_DROP;
|
return;
|
}
|
|
if (help->expecting[NF_CT_EXPECT_CLASS_DEFAULT] >= priv->size) {
|
regs->verdict.code = NFT_BREAK;
|
return;
|
}
|
if (l3num == NFPROTO_INET)
|
l3num = nf_ct_l3num(ct);
|
|
exp = nf_ct_expect_alloc(ct);
|
if (exp == NULL) {
|
regs->verdict.code = NF_DROP;
|
return;
|
}
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, l3num,
|
&ct->tuplehash[!dir].tuple.src.u3,
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
priv->l4proto, NULL, &priv->dport);
|
exp->timeout.expires = jiffies + priv->timeout * HZ;
|
|
if (nf_ct_expect_related(exp, 0) != 0)
|
regs->verdict.code = NF_DROP;
|
}
|
|
static const struct nla_policy nft_ct_expect_policy[NFTA_CT_EXPECT_MAX + 1] = {
|
[NFTA_CT_EXPECT_L3PROTO] = { .type = NLA_U16 },
|
[NFTA_CT_EXPECT_L4PROTO] = { .type = NLA_U8 },
|
[NFTA_CT_EXPECT_DPORT] = { .type = NLA_U16 },
|
[NFTA_CT_EXPECT_TIMEOUT] = { .type = NLA_U32 },
|
[NFTA_CT_EXPECT_SIZE] = { .type = NLA_U8 },
|
};
|
|
static struct nft_object_type nft_ct_expect_obj_type;
|
|
static const struct nft_object_ops nft_ct_expect_obj_ops = {
|
.type = &nft_ct_expect_obj_type,
|
.size = sizeof(struct nft_ct_expect_obj),
|
.eval = nft_ct_expect_obj_eval,
|
.init = nft_ct_expect_obj_init,
|
.destroy = nft_ct_expect_obj_destroy,
|
.dump = nft_ct_expect_obj_dump,
|
};
|
|
static struct nft_object_type nft_ct_expect_obj_type __read_mostly = {
|
.type = NFT_OBJECT_CT_EXPECT,
|
.ops = &nft_ct_expect_obj_ops,
|
.maxattr = NFTA_CT_EXPECT_MAX,
|
.policy = nft_ct_expect_policy,
|
.owner = THIS_MODULE,
|
};
|
|
static int __init nft_ct_module_init(void)
|
{
|
int err;
|
|
BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE);
|
|
err = nft_register_expr(&nft_ct_type);
|
if (err < 0)
|
return err;
|
|
err = nft_register_expr(&nft_notrack_type);
|
if (err < 0)
|
goto err1;
|
|
err = nft_register_obj(&nft_ct_helper_obj_type);
|
if (err < 0)
|
goto err2;
|
|
err = nft_register_obj(&nft_ct_expect_obj_type);
|
if (err < 0)
|
goto err3;
|
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
|
err = nft_register_obj(&nft_ct_timeout_obj_type);
|
if (err < 0)
|
goto err4;
|
#endif
|
return 0;
|
|
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
|
err4:
|
nft_unregister_obj(&nft_ct_expect_obj_type);
|
#endif
|
err3:
|
nft_unregister_obj(&nft_ct_helper_obj_type);
|
err2:
|
nft_unregister_expr(&nft_notrack_type);
|
err1:
|
nft_unregister_expr(&nft_ct_type);
|
return err;
|
}
|
|
static void __exit nft_ct_module_exit(void)
|
{
|
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
|
nft_unregister_obj(&nft_ct_timeout_obj_type);
|
#endif
|
nft_unregister_obj(&nft_ct_expect_obj_type);
|
nft_unregister_obj(&nft_ct_helper_obj_type);
|
nft_unregister_expr(&nft_notrack_type);
|
nft_unregister_expr(&nft_ct_type);
|
}
|
|
module_init(nft_ct_module_init);
|
module_exit(nft_ct_module_exit);
|
|
MODULE_LICENSE("GPL");
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
MODULE_ALIAS_NFT_EXPR("ct");
|
MODULE_ALIAS_NFT_EXPR("notrack");
|
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_HELPER);
|
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_TIMEOUT);
|
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_EXPECT);
|
MODULE_DESCRIPTION("Netfilter nf_tables conntrack module");
|
