![Gao Feng](/assets/img/avatar_default.png)
The param helper of nf_ct_helper_ext_add is useless now, then remove it now. Signed-off-by: Gao Feng <gfree.wind@vip.163.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
977 lines
22 KiB
C
977 lines
22 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_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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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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enum nft_registers dreg:8;
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enum nft_registers sreg:8;
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};
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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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#endif
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static u64 nft_ct_get_eval_counter(const struct nf_conn_counter *c,
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enum nft_ct_keys k,
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enum ip_conntrack_dir d)
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{
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if (d < IP_CT_DIR_MAX)
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return k == NFT_CT_BYTES ? atomic64_read(&c[d].bytes) :
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atomic64_read(&c[d].packets);
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return nft_ct_get_eval_counter(c, k, IP_CT_DIR_ORIGINAL) +
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nft_ct_get_eval_counter(c, k, IP_CT_DIR_REPLY);
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}
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static void nft_ct_get_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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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;
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const struct nf_conntrack_helper *helper;
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unsigned int state;
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ct = nf_ct_get(pkt->skb, &ctinfo);
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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;
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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 = ct->mark;
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return;
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#endif
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
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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)
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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: /* fallthrough */
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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;
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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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}
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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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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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#ifdef CONFIG_NF_CONNTRACK_MARK
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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
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case NFT_CT_MARK:
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if (ct->mark != value) {
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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_LABELS
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case NFT_CT_LABELS:
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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
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case NFT_CT_EVENTMASK: {
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struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct);
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u32 ctmask = regs->data[priv->sreg];
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if (e) {
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if (e->ctmask != ctmask)
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e->ctmask = ctmask;
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break;
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}
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if (ctmask && !nf_ct_is_confirmed(ct))
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nf_ct_ecache_ext_add(ct, ctmask, 0, GFP_ATOMIC);
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break;
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}
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#endif
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default:
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break;
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}
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}
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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 },
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[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
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static void nft_ct_tmpl_put_pcpu(void)
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{
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struct nf_conn *ct;
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int cpu;
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for_each_possible_cpu(cpu) {
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ct = per_cpu(nft_ct_pcpu_template, cpu);
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if (!ct)
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break;
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nf_ct_put(ct);
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per_cpu(nft_ct_pcpu_template, cpu) = NULL;
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}
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}
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static bool nft_ct_tmpl_alloc_pcpu(void)
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{
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struct nf_conntrack_zone zone = { .id = 0 };
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struct nf_conn *tmp;
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int cpu;
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if (nft_ct_pcpu_template_refcnt)
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return true;
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for_each_possible_cpu(cpu) {
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tmp = nf_ct_tmpl_alloc(&init_net, &zone, GFP_KERNEL);
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if (!tmp) {
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nft_ct_tmpl_put_pcpu();
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return false;
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}
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atomic_set(&tmp->ct_general.use, 1);
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per_cpu(nft_ct_pcpu_template, cpu) = tmp;
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}
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return true;
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}
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#endif
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static int nft_ct_get_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_ct *priv = nft_expr_priv(expr);
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unsigned int len;
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int err;
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priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
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priv->dir = IP_CT_DIR_MAX;
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switch (priv->key) {
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case NFT_CT_DIRECTION:
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if (tb[NFTA_CT_DIRECTION] != NULL)
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return -EINVAL;
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len = sizeof(u8);
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break;
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case NFT_CT_STATE:
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case NFT_CT_STATUS:
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#ifdef CONFIG_NF_CONNTRACK_MARK
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case NFT_CT_MARK:
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#endif
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
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case NFT_CT_SECMARK:
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#endif
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case NFT_CT_EXPIRATION:
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if (tb[NFTA_CT_DIRECTION] != NULL)
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return -EINVAL;
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len = sizeof(u32);
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break;
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#ifdef CONFIG_NF_CONNTRACK_LABELS
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case NFT_CT_LABELS:
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if (tb[NFTA_CT_DIRECTION] != NULL)
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return -EINVAL;
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len = NF_CT_LABELS_MAX_SIZE;
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break;
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#endif
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case NFT_CT_HELPER:
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if (tb[NFTA_CT_DIRECTION] != NULL)
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return -EINVAL;
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len = NF_CT_HELPER_NAME_LEN;
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break;
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case NFT_CT_L3PROTOCOL:
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case NFT_CT_PROTOCOL:
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/* For compatibility, do not report error if NFTA_CT_DIRECTION
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* attribute is specified.
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*/
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len = sizeof(u8);
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break;
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case NFT_CT_SRC:
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case NFT_CT_DST:
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if (tb[NFTA_CT_DIRECTION] == NULL)
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return -EINVAL;
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switch (ctx->family) {
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case NFPROTO_IPV4:
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len = FIELD_SIZEOF(struct nf_conntrack_tuple,
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src.u3.ip);
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break;
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case NFPROTO_IPV6:
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case NFPROTO_INET:
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len = FIELD_SIZEOF(struct nf_conntrack_tuple,
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src.u3.ip6);
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break;
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default:
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return -EAFNOSUPPORT;
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}
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break;
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case NFT_CT_SRC_IP:
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case NFT_CT_DST_IP:
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if (tb[NFTA_CT_DIRECTION] == NULL)
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return -EINVAL;
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len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u3.ip);
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break;
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case NFT_CT_SRC_IP6:
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case NFT_CT_DST_IP6:
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if (tb[NFTA_CT_DIRECTION] == NULL)
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return -EINVAL;
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len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u3.ip6);
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break;
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case NFT_CT_PROTO_SRC:
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case NFT_CT_PROTO_DST:
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if (tb[NFTA_CT_DIRECTION] == NULL)
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return -EINVAL;
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len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u.all);
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break;
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case NFT_CT_BYTES:
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case NFT_CT_PKTS:
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case NFT_CT_AVGPKT:
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len = sizeof(u64);
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break;
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#ifdef CONFIG_NF_CONNTRACK_ZONES
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case NFT_CT_ZONE:
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len = sizeof(u16);
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break;
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#endif
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default:
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return -EOPNOTSUPP;
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}
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|
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if (tb[NFTA_CT_DIRECTION] != NULL) {
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priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
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switch (priv->dir) {
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case IP_CT_DIR_ORIGINAL:
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case IP_CT_DIR_REPLY:
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break;
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default:
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return -EINVAL;
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}
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}
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|
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priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]);
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err = nft_validate_register_store(ctx, priv->dreg, NULL,
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NFT_DATA_VALUE, len);
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if (err < 0)
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return err;
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|
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err = nf_ct_netns_get(ctx->net, ctx->family);
|
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if (err < 0)
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return err;
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|
|
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:
|
|
if (--nft_ct_pcpu_template_refcnt == 0)
|
|
nft_ct_tmpl_put_pcpu();
|
|
#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 = FIELD_SIZEOF(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:
|
|
if (!nft_ct_tmpl_alloc_pcpu())
|
|
return -ENOMEM;
|
|
nft_ct_pcpu_template_refcnt++;
|
|
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
|
|
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;
|
|
}
|
|
}
|
|
|
|
priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
|
|
err = nft_validate_register_load(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,
|
|
};
|
|
|
|
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;
|
|
|
|
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: /* fallthrough */
|
|
case NFPROTO_BRIDGE: /* same */
|
|
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;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
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;
|
|
|
|
return 0;
|
|
|
|
err2:
|
|
nft_unregister_expr(&nft_notrack_type);
|
|
err1:
|
|
nft_unregister_expr(&nft_ct_type);
|
|
return err;
|
|
}
|
|
|
|
static void __exit nft_ct_module_exit(void)
|
|
{
|
|
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);
|