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![Florian Westphal](/assets/img/avatar_default.png)
Size and 'next bit' were swapped, this bug could cause worker to
reschedule itself even if system was idle.
Fixes: 5c789e131c
("netfilter: nf_conncount: Add list lock and gc worker, and RCU for init tree search")
Reviewed-by: Shawn Bohrer <sbohrer@cloudflare.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
624 lines
15 KiB
C
624 lines
15 KiB
C
/*
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* count the number of connections matching an arbitrary key.
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*
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* (C) 2017 Red Hat GmbH
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* Author: Florian Westphal <fw@strlen.de>
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*
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* split from xt_connlimit.c:
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* (c) 2000 Gerd Knorr <kraxel@bytesex.org>
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* Nov 2002: Martin Bene <martin.bene@icomedias.com>:
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* only ignore TIME_WAIT or gone connections
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* (C) CC Computer Consultants GmbH, 2007
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/jhash.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/rbtree.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/netfilter/nf_conntrack_tcp.h>
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#include <linux/netfilter/x_tables.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_count.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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#include <net/netfilter/nf_conntrack_zones.h>
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#define CONNCOUNT_SLOTS 256U
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#define CONNCOUNT_GC_MAX_NODES 8
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#define MAX_KEYLEN 5
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/* we will save the tuples of all connections we care about */
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struct nf_conncount_tuple {
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struct list_head node;
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struct nf_conntrack_tuple tuple;
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struct nf_conntrack_zone zone;
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int cpu;
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u32 jiffies32;
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};
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struct nf_conncount_rb {
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struct rb_node node;
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struct nf_conncount_list list;
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u32 key[MAX_KEYLEN];
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struct rcu_head rcu_head;
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};
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static spinlock_t nf_conncount_locks[CONNCOUNT_SLOTS] __cacheline_aligned_in_smp;
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struct nf_conncount_data {
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unsigned int keylen;
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struct rb_root root[CONNCOUNT_SLOTS];
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struct net *net;
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struct work_struct gc_work;
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unsigned long pending_trees[BITS_TO_LONGS(CONNCOUNT_SLOTS)];
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unsigned int gc_tree;
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};
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static u_int32_t conncount_rnd __read_mostly;
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static struct kmem_cache *conncount_rb_cachep __read_mostly;
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static struct kmem_cache *conncount_conn_cachep __read_mostly;
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static inline bool already_closed(const struct nf_conn *conn)
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{
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if (nf_ct_protonum(conn) == IPPROTO_TCP)
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return conn->proto.tcp.state == TCP_CONNTRACK_TIME_WAIT ||
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conn->proto.tcp.state == TCP_CONNTRACK_CLOSE;
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else
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return false;
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}
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static int key_diff(const u32 *a, const u32 *b, unsigned int klen)
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{
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return memcmp(a, b, klen * sizeof(u32));
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}
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static void conn_free(struct nf_conncount_list *list,
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struct nf_conncount_tuple *conn)
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{
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lockdep_assert_held(&list->list_lock);
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list->count--;
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list_del(&conn->node);
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kmem_cache_free(conncount_conn_cachep, conn);
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}
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static const struct nf_conntrack_tuple_hash *
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find_or_evict(struct net *net, struct nf_conncount_list *list,
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struct nf_conncount_tuple *conn)
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{
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const struct nf_conntrack_tuple_hash *found;
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unsigned long a, b;
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int cpu = raw_smp_processor_id();
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u32 age;
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found = nf_conntrack_find_get(net, &conn->zone, &conn->tuple);
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if (found)
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return found;
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b = conn->jiffies32;
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a = (u32)jiffies;
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/* conn might have been added just before by another cpu and
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* might still be unconfirmed. In this case, nf_conntrack_find()
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* returns no result. Thus only evict if this cpu added the
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* stale entry or if the entry is older than two jiffies.
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*/
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age = a - b;
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if (conn->cpu == cpu || age >= 2) {
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conn_free(list, conn);
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return ERR_PTR(-ENOENT);
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}
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return ERR_PTR(-EAGAIN);
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}
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static int __nf_conncount_add(struct net *net,
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struct nf_conncount_list *list,
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const struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_zone *zone)
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{
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const struct nf_conntrack_tuple_hash *found;
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struct nf_conncount_tuple *conn, *conn_n;
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struct nf_conn *found_ct;
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unsigned int collect = 0;
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/* check the saved connections */
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list_for_each_entry_safe(conn, conn_n, &list->head, node) {
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if (collect > CONNCOUNT_GC_MAX_NODES)
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break;
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found = find_or_evict(net, list, conn);
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if (IS_ERR(found)) {
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/* Not found, but might be about to be confirmed */
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if (PTR_ERR(found) == -EAGAIN) {
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if (nf_ct_tuple_equal(&conn->tuple, tuple) &&
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nf_ct_zone_id(&conn->zone, conn->zone.dir) ==
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nf_ct_zone_id(zone, zone->dir))
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return 0; /* already exists */
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} else {
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collect++;
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}
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continue;
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}
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found_ct = nf_ct_tuplehash_to_ctrack(found);
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if (nf_ct_tuple_equal(&conn->tuple, tuple) &&
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nf_ct_zone_equal(found_ct, zone, zone->dir)) {
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/*
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* We should not see tuples twice unless someone hooks
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* this into a table without "-p tcp --syn".
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*
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* Attempt to avoid a re-add in this case.
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*/
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nf_ct_put(found_ct);
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return 0;
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} else if (already_closed(found_ct)) {
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/*
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* we do not care about connections which are
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* closed already -> ditch it
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*/
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nf_ct_put(found_ct);
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conn_free(list, conn);
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collect++;
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continue;
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}
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nf_ct_put(found_ct);
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}
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if (WARN_ON_ONCE(list->count > INT_MAX))
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return -EOVERFLOW;
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conn = kmem_cache_alloc(conncount_conn_cachep, GFP_ATOMIC);
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if (conn == NULL)
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return -ENOMEM;
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conn->tuple = *tuple;
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conn->zone = *zone;
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conn->cpu = raw_smp_processor_id();
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conn->jiffies32 = (u32)jiffies;
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list_add_tail(&conn->node, &list->head);
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list->count++;
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return 0;
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}
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int nf_conncount_add(struct net *net,
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struct nf_conncount_list *list,
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const struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_zone *zone)
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{
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int ret;
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/* check the saved connections */
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spin_lock_bh(&list->list_lock);
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ret = __nf_conncount_add(net, list, tuple, zone);
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spin_unlock_bh(&list->list_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nf_conncount_add);
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void nf_conncount_list_init(struct nf_conncount_list *list)
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{
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spin_lock_init(&list->list_lock);
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INIT_LIST_HEAD(&list->head);
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list->count = 0;
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}
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EXPORT_SYMBOL_GPL(nf_conncount_list_init);
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/* Return true if the list is empty. Must be called with BH disabled. */
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bool nf_conncount_gc_list(struct net *net,
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struct nf_conncount_list *list)
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{
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const struct nf_conntrack_tuple_hash *found;
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struct nf_conncount_tuple *conn, *conn_n;
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struct nf_conn *found_ct;
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unsigned int collected = 0;
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bool ret = false;
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/* don't bother if other cpu is already doing GC */
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if (!spin_trylock(&list->list_lock))
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return false;
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list_for_each_entry_safe(conn, conn_n, &list->head, node) {
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found = find_or_evict(net, list, conn);
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if (IS_ERR(found)) {
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if (PTR_ERR(found) == -ENOENT)
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collected++;
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continue;
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}
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found_ct = nf_ct_tuplehash_to_ctrack(found);
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if (already_closed(found_ct)) {
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/*
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* we do not care about connections which are
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* closed already -> ditch it
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*/
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nf_ct_put(found_ct);
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conn_free(list, conn);
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collected++;
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continue;
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}
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nf_ct_put(found_ct);
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if (collected > CONNCOUNT_GC_MAX_NODES)
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break;
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}
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if (!list->count)
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ret = true;
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spin_unlock(&list->list_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nf_conncount_gc_list);
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static void __tree_nodes_free(struct rcu_head *h)
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{
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struct nf_conncount_rb *rbconn;
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rbconn = container_of(h, struct nf_conncount_rb, rcu_head);
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kmem_cache_free(conncount_rb_cachep, rbconn);
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}
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/* caller must hold tree nf_conncount_locks[] lock */
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static void tree_nodes_free(struct rb_root *root,
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struct nf_conncount_rb *gc_nodes[],
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unsigned int gc_count)
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{
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struct nf_conncount_rb *rbconn;
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while (gc_count) {
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rbconn = gc_nodes[--gc_count];
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spin_lock(&rbconn->list.list_lock);
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if (!rbconn->list.count) {
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rb_erase(&rbconn->node, root);
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call_rcu(&rbconn->rcu_head, __tree_nodes_free);
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}
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spin_unlock(&rbconn->list.list_lock);
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}
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}
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static void schedule_gc_worker(struct nf_conncount_data *data, int tree)
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{
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set_bit(tree, data->pending_trees);
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schedule_work(&data->gc_work);
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}
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static unsigned int
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insert_tree(struct net *net,
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struct nf_conncount_data *data,
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struct rb_root *root,
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unsigned int hash,
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const u32 *key,
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const struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_zone *zone)
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{
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struct nf_conncount_rb *gc_nodes[CONNCOUNT_GC_MAX_NODES];
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struct rb_node **rbnode, *parent;
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struct nf_conncount_rb *rbconn;
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struct nf_conncount_tuple *conn;
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unsigned int count = 0, gc_count = 0;
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u8 keylen = data->keylen;
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bool do_gc = true;
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spin_lock_bh(&nf_conncount_locks[hash]);
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restart:
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parent = NULL;
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rbnode = &(root->rb_node);
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while (*rbnode) {
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int diff;
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rbconn = rb_entry(*rbnode, struct nf_conncount_rb, node);
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parent = *rbnode;
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diff = key_diff(key, rbconn->key, keylen);
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if (diff < 0) {
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rbnode = &((*rbnode)->rb_left);
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} else if (diff > 0) {
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rbnode = &((*rbnode)->rb_right);
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} else {
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int ret;
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ret = nf_conncount_add(net, &rbconn->list, tuple, zone);
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if (ret)
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count = 0; /* hotdrop */
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else
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count = rbconn->list.count;
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tree_nodes_free(root, gc_nodes, gc_count);
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goto out_unlock;
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}
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if (gc_count >= ARRAY_SIZE(gc_nodes))
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continue;
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if (do_gc && nf_conncount_gc_list(net, &rbconn->list))
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gc_nodes[gc_count++] = rbconn;
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}
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if (gc_count) {
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tree_nodes_free(root, gc_nodes, gc_count);
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schedule_gc_worker(data, hash);
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gc_count = 0;
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do_gc = false;
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goto restart;
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}
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/* expected case: match, insert new node */
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rbconn = kmem_cache_alloc(conncount_rb_cachep, GFP_ATOMIC);
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if (rbconn == NULL)
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goto out_unlock;
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conn = kmem_cache_alloc(conncount_conn_cachep, GFP_ATOMIC);
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if (conn == NULL) {
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kmem_cache_free(conncount_rb_cachep, rbconn);
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goto out_unlock;
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}
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conn->tuple = *tuple;
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conn->zone = *zone;
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memcpy(rbconn->key, key, sizeof(u32) * keylen);
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nf_conncount_list_init(&rbconn->list);
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list_add(&conn->node, &rbconn->list.head);
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count = 1;
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rbconn->list.count = count;
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rb_link_node_rcu(&rbconn->node, parent, rbnode);
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rb_insert_color(&rbconn->node, root);
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out_unlock:
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spin_unlock_bh(&nf_conncount_locks[hash]);
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return count;
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}
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static unsigned int
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count_tree(struct net *net,
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struct nf_conncount_data *data,
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const u32 *key,
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const struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_zone *zone)
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{
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struct rb_root *root;
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struct rb_node *parent;
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struct nf_conncount_rb *rbconn;
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unsigned int hash;
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u8 keylen = data->keylen;
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hash = jhash2(key, data->keylen, conncount_rnd) % CONNCOUNT_SLOTS;
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root = &data->root[hash];
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parent = rcu_dereference_raw(root->rb_node);
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while (parent) {
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int diff;
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rbconn = rb_entry(parent, struct nf_conncount_rb, node);
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diff = key_diff(key, rbconn->key, keylen);
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if (diff < 0) {
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parent = rcu_dereference_raw(parent->rb_left);
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} else if (diff > 0) {
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parent = rcu_dereference_raw(parent->rb_right);
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} else {
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int ret;
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if (!tuple) {
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nf_conncount_gc_list(net, &rbconn->list);
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return rbconn->list.count;
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}
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spin_lock_bh(&rbconn->list.list_lock);
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/* Node might be about to be free'd.
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* We need to defer to insert_tree() in this case.
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*/
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if (rbconn->list.count == 0) {
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spin_unlock_bh(&rbconn->list.list_lock);
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break;
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}
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/* same source network -> be counted! */
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ret = __nf_conncount_add(net, &rbconn->list, tuple, zone);
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spin_unlock_bh(&rbconn->list.list_lock);
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if (ret)
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return 0; /* hotdrop */
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else
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return rbconn->list.count;
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}
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}
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if (!tuple)
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return 0;
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return insert_tree(net, data, root, hash, key, tuple, zone);
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}
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static void tree_gc_worker(struct work_struct *work)
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{
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struct nf_conncount_data *data = container_of(work, struct nf_conncount_data, gc_work);
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struct nf_conncount_rb *gc_nodes[CONNCOUNT_GC_MAX_NODES], *rbconn;
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struct rb_root *root;
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struct rb_node *node;
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unsigned int tree, next_tree, gc_count = 0;
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tree = data->gc_tree % CONNCOUNT_SLOTS;
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root = &data->root[tree];
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local_bh_disable();
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rcu_read_lock();
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for (node = rb_first(root); node != NULL; node = rb_next(node)) {
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rbconn = rb_entry(node, struct nf_conncount_rb, node);
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if (nf_conncount_gc_list(data->net, &rbconn->list))
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gc_count++;
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}
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rcu_read_unlock();
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local_bh_enable();
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cond_resched();
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spin_lock_bh(&nf_conncount_locks[tree]);
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if (gc_count < ARRAY_SIZE(gc_nodes))
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goto next; /* do not bother */
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gc_count = 0;
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node = rb_first(root);
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while (node != NULL) {
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rbconn = rb_entry(node, struct nf_conncount_rb, node);
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node = rb_next(node);
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if (rbconn->list.count > 0)
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continue;
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gc_nodes[gc_count++] = rbconn;
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if (gc_count >= ARRAY_SIZE(gc_nodes)) {
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tree_nodes_free(root, gc_nodes, gc_count);
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gc_count = 0;
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}
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}
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tree_nodes_free(root, gc_nodes, gc_count);
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next:
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clear_bit(tree, data->pending_trees);
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next_tree = (tree + 1) % CONNCOUNT_SLOTS;
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next_tree = find_next_bit(data->pending_trees, CONNCOUNT_SLOTS, next_tree);
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if (next_tree < CONNCOUNT_SLOTS) {
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data->gc_tree = next_tree;
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schedule_work(work);
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}
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spin_unlock_bh(&nf_conncount_locks[tree]);
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}
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/* Count and return number of conntrack entries in 'net' with particular 'key'.
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* If 'tuple' is not null, insert it into the accounting data structure.
|
|
* Call with RCU read lock.
|
|
*/
|
|
unsigned int nf_conncount_count(struct net *net,
|
|
struct nf_conncount_data *data,
|
|
const u32 *key,
|
|
const struct nf_conntrack_tuple *tuple,
|
|
const struct nf_conntrack_zone *zone)
|
|
{
|
|
return count_tree(net, data, key, tuple, zone);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_conncount_count);
|
|
|
|
struct nf_conncount_data *nf_conncount_init(struct net *net, unsigned int family,
|
|
unsigned int keylen)
|
|
{
|
|
struct nf_conncount_data *data;
|
|
int ret, i;
|
|
|
|
if (keylen % sizeof(u32) ||
|
|
keylen / sizeof(u32) > MAX_KEYLEN ||
|
|
keylen == 0)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
net_get_random_once(&conncount_rnd, sizeof(conncount_rnd));
|
|
|
|
data = kmalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = nf_ct_netns_get(net, family);
|
|
if (ret < 0) {
|
|
kfree(data);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(data->root); ++i)
|
|
data->root[i] = RB_ROOT;
|
|
|
|
data->keylen = keylen / sizeof(u32);
|
|
data->net = net;
|
|
INIT_WORK(&data->gc_work, tree_gc_worker);
|
|
|
|
return data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_conncount_init);
|
|
|
|
void nf_conncount_cache_free(struct nf_conncount_list *list)
|
|
{
|
|
struct nf_conncount_tuple *conn, *conn_n;
|
|
|
|
list_for_each_entry_safe(conn, conn_n, &list->head, node)
|
|
kmem_cache_free(conncount_conn_cachep, conn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_conncount_cache_free);
|
|
|
|
static void destroy_tree(struct rb_root *r)
|
|
{
|
|
struct nf_conncount_rb *rbconn;
|
|
struct rb_node *node;
|
|
|
|
while ((node = rb_first(r)) != NULL) {
|
|
rbconn = rb_entry(node, struct nf_conncount_rb, node);
|
|
|
|
rb_erase(node, r);
|
|
|
|
nf_conncount_cache_free(&rbconn->list);
|
|
|
|
kmem_cache_free(conncount_rb_cachep, rbconn);
|
|
}
|
|
}
|
|
|
|
void nf_conncount_destroy(struct net *net, unsigned int family,
|
|
struct nf_conncount_data *data)
|
|
{
|
|
unsigned int i;
|
|
|
|
cancel_work_sync(&data->gc_work);
|
|
nf_ct_netns_put(net, family);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(data->root); ++i)
|
|
destroy_tree(&data->root[i]);
|
|
|
|
kfree(data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_conncount_destroy);
|
|
|
|
static int __init nf_conncount_modinit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < CONNCOUNT_SLOTS; ++i)
|
|
spin_lock_init(&nf_conncount_locks[i]);
|
|
|
|
conncount_conn_cachep = kmem_cache_create("nf_conncount_tuple",
|
|
sizeof(struct nf_conncount_tuple),
|
|
0, 0, NULL);
|
|
if (!conncount_conn_cachep)
|
|
return -ENOMEM;
|
|
|
|
conncount_rb_cachep = kmem_cache_create("nf_conncount_rb",
|
|
sizeof(struct nf_conncount_rb),
|
|
0, 0, NULL);
|
|
if (!conncount_rb_cachep) {
|
|
kmem_cache_destroy(conncount_conn_cachep);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit nf_conncount_modexit(void)
|
|
{
|
|
kmem_cache_destroy(conncount_conn_cachep);
|
|
kmem_cache_destroy(conncount_rb_cachep);
|
|
}
|
|
|
|
module_init(nf_conncount_modinit);
|
|
module_exit(nf_conncount_modexit);
|
|
MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
|
|
MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
|
|
MODULE_DESCRIPTION("netfilter: count number of connections matching a key");
|
|
MODULE_LICENSE("GPL");
|