![David S. Miller](/assets/img/avatar_default.png)
Pablo Neira Ayuso says: ==================== Netfilter/IPVS updates for net-next The following patchset contains Netfilter/IPVS updates for net-next, they are: 1) Count pre-established connections as active in "least connection" schedulers such that pre-established connections to avoid overloading backend servers on peak demands, from Michal Kubecek via Simon Horman. 2) Address a race condition when resizing the conntrack table by caching the bucket size when fulling iterating over the hashtable in these three possible scenarios: 1) dump via /proc/net/nf_conntrack, 2) unlinking userspace helper and 3) unlinking custom conntrack timeout. From Liping Zhang. 3) Revisit early_drop() path to perform lockless traversal on conntrack eviction under stress, use del_timer() as synchronization point to avoid two CPUs evicting the same entry, from Florian Westphal. 4) Move NAT hlist_head to nf_conn object, this simplifies the existing NAT extension and it doesn't increase size since recent patches to align nf_conn, from Florian. 5) Use rhashtable for the by-source NAT hashtable, also from Florian. 6) Don't allow --physdev-is-out from OUTPUT chain, just like --physdev-out is not either, from Hangbin Liu. 7) Automagically set on nf_conntrack counters if the user tries to match ct bytes/packets from nftables, from Liping Zhang. 8) Remove possible_net_t fields in nf_tables set objects since we just simply pass the net pointer to the backend set type implementations. 9) Fix possible off-by-one in h323, from Toby DiPasquale. 10) early_drop() may be called from ctnetlink patch, so we must hold rcu read size lock from them too, this amends Florian's patch #3 coming in this batch, from Liping Zhang. 11) Use binary search to validate jump offset in x_tables, this addresses the O(n!) validation that was introduced recently resolve security issues with unpriviledge namespaces, from Florian. 12) Fix reference leak to connlabel in error path of nft_ct, from Zhang. 13) Three updates for nft_log: Fix log prefix leak in error path. Bail out on loglevel larger than debug in nft_log and set on the new NF_LOG_F_COPY_LEN flag when snaplen is specified. Again from Zhang. 14) Allow to filter rule dumps in nf_tables based on table and chain names. 15) Simplify connlabel to always use 128 bits to store labels and get rid of unused function in xt_connlabel, from Florian. 16) Replace set_expect_timeout() by mod_timer() from the h323 conntrack helper, by Gao Feng. 17) Put back x_tables module reference in nft_compat on error, from Liping Zhang. 18) Add a reference count to the x_tables extensions cache in nft_compat, so we can remove them when unused and avoid a crash if the extensions are rmmod, again from Zhang. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
538 lines
12 KiB
C
538 lines
12 KiB
C
/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_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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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 == NULL)
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state = NF_CT_STATE_INVALID_BIT;
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else if (nf_ct_is_untracked(ct))
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state = NF_CT_STATE_UNTRACKED_BIT;
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else
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state = NF_CT_STATE_BIT(ctinfo);
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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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*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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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_L3PROTOCOL:
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*dest = nf_ct_l3num(ct);
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return;
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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_PROTOCOL:
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*dest = nf_ct_protonum(ct);
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return;
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case NFT_CT_PROTO_SRC:
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*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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*dest = (__force __u16)tuple->dst.u.all;
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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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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)
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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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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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static int nft_ct_l3proto_try_module_get(uint8_t family)
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{
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int err;
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if (family == NFPROTO_INET) {
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err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4);
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if (err < 0)
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goto err1;
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err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6);
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if (err < 0)
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goto err2;
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} else {
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err = nf_ct_l3proto_try_module_get(family);
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if (err < 0)
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goto err1;
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}
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return 0;
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err2:
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nf_ct_l3proto_module_put(NFPROTO_IPV4);
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err1:
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return err;
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}
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static void nft_ct_l3proto_module_put(uint8_t family)
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{
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if (family == NFPROTO_INET) {
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nf_ct_l3proto_module_put(NFPROTO_IPV4);
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nf_ct_l3proto_module_put(NFPROTO_IPV6);
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} else
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nf_ct_l3proto_module_put(family);
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}
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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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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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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_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->afi->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_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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/* no direction? return sum of original + reply */
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if (tb[NFTA_CT_DIRECTION] == NULL)
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priv->dir = IP_CT_DIR_MAX;
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len = sizeof(u64);
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break;
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default:
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return -EOPNOTSUPP;
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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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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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err = nft_ct_l3proto_try_module_get(ctx->afi->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)
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nf_ct_set_acct(ctx->net, true);
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return 0;
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}
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static int nft_ct_set_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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bool label_got = false;
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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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switch (priv->key) {
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#ifdef CONFIG_NF_CONNTRACK_MARK
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case NFT_CT_MARK:
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len = FIELD_SIZEOF(struct nf_conn, mark);
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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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if (tb[NFTA_CT_DIRECTION])
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return -EINVAL;
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len = NF_CT_LABELS_MAX_SIZE;
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err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1);
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if (err)
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return err;
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label_got = true;
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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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priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
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err = nft_validate_register_load(priv->sreg, len);
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if (err < 0)
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goto err1;
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err = nft_ct_l3proto_try_module_get(ctx->afi->family);
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if (err < 0)
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goto err1;
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return 0;
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err1:
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if (label_got)
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nf_connlabels_put(ctx->net);
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return err;
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}
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static void nft_ct_get_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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nft_ct_l3proto_module_put(ctx->afi->family);
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}
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static void nft_ct_set_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_ct *priv = nft_expr_priv(expr);
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switch (priv->key) {
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#ifdef CONFIG_NF_CONNTRACK_LABELS
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case NFT_CT_LABELS:
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nf_connlabels_put(ctx->net);
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break;
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#endif
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default:
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break;
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}
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nft_ct_l3proto_module_put(ctx->afi->family);
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}
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static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_ct *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
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goto nla_put_failure;
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switch (priv->key) {
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case NFT_CT_L3PROTOCOL:
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case NFT_CT_PROTOCOL:
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case NFT_CT_SRC:
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case NFT_CT_DST:
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case NFT_CT_PROTO_SRC:
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case NFT_CT_PROTO_DST:
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if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
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goto nla_put_failure;
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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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if (priv->dir < IP_CT_DIR_MAX &&
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nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
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goto nla_put_failure;
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break;
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default:
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break;
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}
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return 0;
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nla_put_failure:
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return -1;
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}
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static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_ct *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
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goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
|
|
goto nla_put_failure;
|
|
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,
|
|
};
|
|
|
|
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])
|
|
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 int __init nft_ct_module_init(void)
|
|
{
|
|
BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE);
|
|
|
|
return nft_register_expr(&nft_ct_type);
|
|
}
|
|
|
|
static void __exit nft_ct_module_exit(void)
|
|
{
|
|
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");
|