#include <linux/err.h>
#include <linux/percpu.h>
#include <linux/moduleparam.h>
+#include <linux/notifier.h>
-/* This rwlock protects the main hash table, protocol/helper/expected
+/* ip_conntrack_lock protects the main hash table, protocol/helper/expected
registrations, conntrack timers*/
-#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_conntrack_lock)
-#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_conntrack_lock)
+#define ASSERT_READ_LOCK(x)
+#define ASSERT_WRITE_LOCK(x)
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
#include <linux/netfilter_ipv4/ip_conntrack_core.h>
#include <linux/netfilter_ipv4/listhelp.h>
-#define IP_CONNTRACK_VERSION "2.1"
+#define IP_CONNTRACK_VERSION "2.4"
#if 0
#define DEBUGP printk
#define DEBUGP(format, args...)
#endif
-DECLARE_RWLOCK(ip_conntrack_lock);
+DEFINE_RWLOCK(ip_conntrack_lock);
/* ip_conntrack_standalone needs this */
atomic_t ip_conntrack_count = ATOMIC_INIT(0);
unsigned int ip_conntrack_htable_size = 0;
int ip_conntrack_max;
struct list_head *ip_conntrack_hash;
-static kmem_cache_t *ip_conntrack_cachep;
-static kmem_cache_t *ip_conntrack_expect_cachep;
+static kmem_cache_t *ip_conntrack_cachep __read_mostly;
+static kmem_cache_t *ip_conntrack_expect_cachep __read_mostly;
struct ip_conntrack ip_conntrack_untracked;
unsigned int ip_ct_log_invalid;
static LIST_HEAD(unconfirmed);
static int ip_conntrack_vmalloc;
-DEFINE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
+static unsigned int ip_conntrack_next_id;
+static unsigned int ip_conntrack_expect_next_id;
+#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
+ATOMIC_NOTIFIER_HEAD(ip_conntrack_chain);
+ATOMIC_NOTIFIER_HEAD(ip_conntrack_expect_chain);
+
+DEFINE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
+
+/* deliver cached events and clear cache entry - must be called with locally
+ * disabled softirqs */
+static inline void
+__ip_ct_deliver_cached_events(struct ip_conntrack_ecache *ecache)
+{
+ DEBUGP("ecache: delivering events for %p\n", ecache->ct);
+ if (is_confirmed(ecache->ct) && !is_dying(ecache->ct) && ecache->events)
+ atomic_notifier_call_chain(&ip_conntrack_chain, ecache->events,
+ ecache->ct);
+ ecache->events = 0;
+ ip_conntrack_put(ecache->ct);
+ ecache->ct = NULL;
+}
+
+/* Deliver all cached events for a particular conntrack. This is called
+ * by code prior to async packet handling or freeing the skb */
+void ip_ct_deliver_cached_events(const struct ip_conntrack *ct)
+{
+ struct ip_conntrack_ecache *ecache;
+
+ local_bh_disable();
+ ecache = &__get_cpu_var(ip_conntrack_ecache);
+ if (ecache->ct == ct)
+ __ip_ct_deliver_cached_events(ecache);
+ local_bh_enable();
+}
-void
-ip_conntrack_put(struct ip_conntrack *ct)
+void __ip_ct_event_cache_init(struct ip_conntrack *ct)
{
- IP_NF_ASSERT(ct);
- nf_conntrack_put(&ct->ct_general);
+ struct ip_conntrack_ecache *ecache;
+
+ /* take care of delivering potentially old events */
+ ecache = &__get_cpu_var(ip_conntrack_ecache);
+ BUG_ON(ecache->ct == ct);
+ if (ecache->ct)
+ __ip_ct_deliver_cached_events(ecache);
+ /* initialize for this conntrack/packet */
+ ecache->ct = ct;
+ nf_conntrack_get(&ct->ct_general);
}
+/* flush the event cache - touches other CPU's data and must not be called while
+ * packets are still passing through the code */
+static void ip_ct_event_cache_flush(void)
+{
+ struct ip_conntrack_ecache *ecache;
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ ecache = &per_cpu(ip_conntrack_ecache, cpu);
+ if (ecache->ct)
+ ip_conntrack_put(ecache->ct);
+ }
+}
+#else
+static inline void ip_ct_event_cache_flush(void) {}
+#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
+
+DEFINE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
+
static int ip_conntrack_hash_rnd_initted;
static unsigned int ip_conntrack_hash_rnd;
-static u_int32_t
-hash_conntrack(const struct ip_conntrack_tuple *tuple)
+static u_int32_t __hash_conntrack(const struct ip_conntrack_tuple *tuple,
+ unsigned int size, unsigned int rnd)
{
-#if 0
- dump_tuple(tuple);
-#endif
return (jhash_3words(tuple->src.ip,
(tuple->dst.ip ^ tuple->dst.protonum),
(tuple->src.u.all | (tuple->dst.u.all << 16)),
- ip_conntrack_hash_rnd) % ip_conntrack_htable_size);
+ rnd) % size);
+}
+
+static u_int32_t
+hash_conntrack(const struct ip_conntrack_tuple *tuple)
+{
+ return __hash_conntrack(tuple, ip_conntrack_htable_size,
+ ip_conntrack_hash_rnd);
}
int
/* ip_conntrack_expect helper functions */
-static void destroy_expect(struct ip_conntrack_expect *exp)
+void ip_ct_unlink_expect(struct ip_conntrack_expect *exp)
{
- ip_conntrack_put(exp->master);
+ ASSERT_WRITE_LOCK(&ip_conntrack_lock);
IP_NF_ASSERT(!timer_pending(&exp->timeout));
- kmem_cache_free(ip_conntrack_expect_cachep, exp);
- CONNTRACK_STAT_INC(expect_delete);
-}
-
-static void unlink_expect(struct ip_conntrack_expect *exp)
-{
- MUST_BE_WRITE_LOCKED(&ip_conntrack_lock);
list_del(&exp->list);
- /* Logically in destroy_expect, but we hold the lock here. */
+ CONNTRACK_STAT_INC(expect_delete);
exp->master->expecting--;
+ ip_conntrack_expect_put(exp);
}
static void expectation_timed_out(unsigned long ul_expect)
{
struct ip_conntrack_expect *exp = (void *)ul_expect;
- WRITE_LOCK(&ip_conntrack_lock);
- unlink_expect(exp);
- WRITE_UNLOCK(&ip_conntrack_lock);
- destroy_expect(exp);
+ write_lock_bh(&ip_conntrack_lock);
+ ip_ct_unlink_expect(exp);
+ write_unlock_bh(&ip_conntrack_lock);
+ ip_conntrack_expect_put(exp);
+}
+
+struct ip_conntrack_expect *
+__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple)
+{
+ struct ip_conntrack_expect *i;
+
+ list_for_each_entry(i, &ip_conntrack_expect_list, list) {
+ if (ip_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)) {
+ atomic_inc(&i->use);
+ return i;
+ }
+ }
+ return NULL;
+}
+
+/* Just find a expectation corresponding to a tuple. */
+struct ip_conntrack_expect *
+ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple)
+{
+ struct ip_conntrack_expect *i;
+
+ read_lock_bh(&ip_conntrack_lock);
+ i = __ip_conntrack_expect_find(tuple);
+ read_unlock_bh(&ip_conntrack_lock);
+
+ return i;
}
/* If an expectation for this connection is found, it gets delete from
master ct never got confirmed, we'd hold a reference to it
and weird things would happen to future packets). */
if (ip_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)
- && is_confirmed(i->master)
- && del_timer(&i->timeout)) {
- unlink_expect(i);
- return i;
+ && is_confirmed(i->master)) {
+ if (i->flags & IP_CT_EXPECT_PERMANENT) {
+ atomic_inc(&i->use);
+ return i;
+ } else if (del_timer(&i->timeout)) {
+ ip_ct_unlink_expect(i);
+ return i;
+ }
}
}
return NULL;
}
/* delete all expectations for this conntrack */
-static void remove_expectations(struct ip_conntrack *ct)
+void ip_ct_remove_expectations(struct ip_conntrack *ct)
{
struct ip_conntrack_expect *i, *tmp;
list_for_each_entry_safe(i, tmp, &ip_conntrack_expect_list, list) {
if (i->master == ct && del_timer(&i->timeout)) {
- unlink_expect(i);
- destroy_expect(i);
+ ip_ct_unlink_expect(i);
+ ip_conntrack_expect_put(i);
}
}
}
unsigned int ho, hr;
DEBUGP("clean_from_lists(%p)\n", ct);
- MUST_BE_WRITE_LOCKED(&ip_conntrack_lock);
+ ASSERT_WRITE_LOCK(&ip_conntrack_lock);
ho = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
hr = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
LIST_DELETE(&ip_conntrack_hash[hr], &ct->tuplehash[IP_CT_DIR_REPLY]);
/* Destroy all pending expectations */
- remove_expectations(ct);
+ ip_ct_remove_expectations(ct);
}
static void
IP_NF_ASSERT(atomic_read(&nfct->use) == 0);
IP_NF_ASSERT(!timer_pending(&ct->timeout));
+ ip_conntrack_event(IPCT_DESTROY, ct);
+ set_bit(IPS_DYING_BIT, &ct->status);
+
/* To make sure we don't get any weird locking issues here:
* destroy_conntrack() MUST NOT be called with a write lock
* to ip_conntrack_lock!!! -HW */
- proto = ip_ct_find_proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
+ proto = __ip_conntrack_proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
if (proto && proto->destroy)
proto->destroy(ct);
if (ip_conntrack_destroyed)
ip_conntrack_destroyed(ct);
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
/* Expectations will have been removed in clean_from_lists,
* except TFTP can create an expectation on the first packet,
* before connection is in the list, so we need to clean here,
* too. */
- remove_expectations(ct);
+ ip_ct_remove_expectations(ct);
/* We overload first tuple to link into unconfirmed list. */
if (!is_confirmed(ct)) {
}
CONNTRACK_STAT_INC(delete);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
if (ct->master)
ip_conntrack_put(ct->master);
DEBUGP("destroy_conntrack: returning ct=%p to slab\n", ct);
- kmem_cache_free(ip_conntrack_cachep, ct);
- atomic_dec(&ip_conntrack_count);
+ ip_conntrack_free(ct);
}
static void death_by_timeout(unsigned long ul_conntrack)
{
struct ip_conntrack *ct = (void *)ul_conntrack;
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
/* Inside lock so preempt is disabled on module removal path.
* Otherwise we can get spurious warnings. */
CONNTRACK_STAT_INC(delete_list);
clean_from_lists(ct);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
ip_conntrack_put(ct);
}
const struct ip_conntrack_tuple *tuple,
const struct ip_conntrack *ignored_conntrack)
{
- MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+ ASSERT_READ_LOCK(&ip_conntrack_lock);
return tuplehash_to_ctrack(i) != ignored_conntrack
&& ip_ct_tuple_equal(tuple, &i->tuple);
}
-static struct ip_conntrack_tuple_hash *
+struct ip_conntrack_tuple_hash *
__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
const struct ip_conntrack *ignored_conntrack)
{
struct ip_conntrack_tuple_hash *h;
unsigned int hash = hash_conntrack(tuple);
- MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+ ASSERT_READ_LOCK(&ip_conntrack_lock);
list_for_each_entry(h, &ip_conntrack_hash[hash], list) {
if (conntrack_tuple_cmp(h, tuple, ignored_conntrack)) {
CONNTRACK_STAT_INC(found);
{
struct ip_conntrack_tuple_hash *h;
- READ_LOCK(&ip_conntrack_lock);
+ read_lock_bh(&ip_conntrack_lock);
h = __ip_conntrack_find(tuple, ignored_conntrack);
if (h)
atomic_inc(&tuplehash_to_ctrack(h)->ct_general.use);
- READ_UNLOCK(&ip_conntrack_lock);
+ read_unlock_bh(&ip_conntrack_lock);
return h;
}
+static void __ip_conntrack_hash_insert(struct ip_conntrack *ct,
+ unsigned int hash,
+ unsigned int repl_hash)
+{
+ ct->id = ++ip_conntrack_next_id;
+ list_prepend(&ip_conntrack_hash[hash],
+ &ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
+ list_prepend(&ip_conntrack_hash[repl_hash],
+ &ct->tuplehash[IP_CT_DIR_REPLY].list);
+}
+
+void ip_conntrack_hash_insert(struct ip_conntrack *ct)
+{
+ unsigned int hash, repl_hash;
+
+ hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+ repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+ write_lock_bh(&ip_conntrack_lock);
+ __ip_conntrack_hash_insert(ct, hash, repl_hash);
+ write_unlock_bh(&ip_conntrack_lock);
+}
+
/* Confirm a connection given skb; places it in hash table */
int
__ip_conntrack_confirm(struct sk_buff **pskb)
IP_NF_ASSERT(!is_confirmed(ct));
DEBUGP("Confirming conntrack %p\n", ct);
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
/* See if there's one in the list already, including reverse:
NAT could have grabbed it without realizing, since we're
/* Remove from unconfirmed list */
list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
- list_prepend(&ip_conntrack_hash[hash],
- &ct->tuplehash[IP_CT_DIR_ORIGINAL]);
- list_prepend(&ip_conntrack_hash[repl_hash],
- &ct->tuplehash[IP_CT_DIR_REPLY]);
+ __ip_conntrack_hash_insert(ct, hash, repl_hash);
/* Timer relative to confirmation time, not original
setting time, otherwise we'd get timer wrap in
weird delay cases. */
atomic_inc(&ct->ct_general.use);
set_bit(IPS_CONFIRMED_BIT, &ct->status);
CONNTRACK_STAT_INC(insert);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
+ if (ct->helper)
+ ip_conntrack_event_cache(IPCT_HELPER, *pskb);
+#ifdef CONFIG_IP_NF_NAT_NEEDED
+ if (test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status) ||
+ test_bit(IPS_DST_NAT_DONE_BIT, &ct->status))
+ ip_conntrack_event_cache(IPCT_NATINFO, *pskb);
+#endif
+ ip_conntrack_event_cache(master_ct(ct) ?
+ IPCT_RELATED : IPCT_NEW, *pskb);
+
return NF_ACCEPT;
}
CONNTRACK_STAT_INC(insert_failed);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
return NF_DROP;
}
{
struct ip_conntrack_tuple_hash *h;
- READ_LOCK(&ip_conntrack_lock);
+ read_lock_bh(&ip_conntrack_lock);
h = __ip_conntrack_find(tuple, ignored_conntrack);
- READ_UNLOCK(&ip_conntrack_lock);
+ read_unlock_bh(&ip_conntrack_lock);
return h != NULL;
}
struct ip_conntrack *ct = NULL;
int dropped = 0;
- READ_LOCK(&ip_conntrack_lock);
+ read_lock_bh(&ip_conntrack_lock);
h = LIST_FIND_B(chain, unreplied, struct ip_conntrack_tuple_hash *);
if (h) {
ct = tuplehash_to_ctrack(h);
atomic_inc(&ct->ct_general.use);
}
- READ_UNLOCK(&ip_conntrack_lock);
+ read_unlock_bh(&ip_conntrack_lock);
if (!ct)
return dropped;
return ip_ct_tuple_mask_cmp(rtuple, &i->tuple, &i->mask);
}
-static struct ip_conntrack_helper *ip_ct_find_helper(const struct ip_conntrack_tuple *tuple)
+static struct ip_conntrack_helper *
+__ip_conntrack_helper_find( const struct ip_conntrack_tuple *tuple)
{
return LIST_FIND(&helpers, helper_cmp,
struct ip_conntrack_helper *,
tuple);
}
-/* Allocate a new conntrack: we return -ENOMEM if classification
- failed due to stress. Otherwise it really is unclassifiable. */
-static struct ip_conntrack_tuple_hash *
-init_conntrack(const struct ip_conntrack_tuple *tuple,
- struct ip_conntrack_protocol *protocol,
- struct sk_buff *skb)
+struct ip_conntrack_helper *
+ip_conntrack_helper_find_get( const struct ip_conntrack_tuple *tuple)
+{
+ struct ip_conntrack_helper *helper;
+
+ /* need ip_conntrack_lock to assure that helper exists until
+ * try_module_get() is called */
+ read_lock_bh(&ip_conntrack_lock);
+
+ helper = __ip_conntrack_helper_find(tuple);
+ if (helper) {
+ /* need to increase module usage count to assure helper will
+ * not go away while the caller is e.g. busy putting a
+ * conntrack in the hash that uses the helper */
+ if (!try_module_get(helper->me))
+ helper = NULL;
+ }
+
+ read_unlock_bh(&ip_conntrack_lock);
+
+ return helper;
+}
+
+void ip_conntrack_helper_put(struct ip_conntrack_helper *helper)
+{
+ module_put(helper->me);
+}
+
+struct ip_conntrack_protocol *
+__ip_conntrack_proto_find(u_int8_t protocol)
+{
+ return ip_ct_protos[protocol];
+}
+
+/* this is guaranteed to always return a valid protocol helper, since
+ * it falls back to generic_protocol */
+struct ip_conntrack_protocol *
+ip_conntrack_proto_find_get(u_int8_t protocol)
+{
+ struct ip_conntrack_protocol *p;
+
+ preempt_disable();
+ p = __ip_conntrack_proto_find(protocol);
+ if (p) {
+ if (!try_module_get(p->me))
+ p = &ip_conntrack_generic_protocol;
+ }
+ preempt_enable();
+
+ return p;
+}
+
+void ip_conntrack_proto_put(struct ip_conntrack_protocol *p)
+{
+ module_put(p->me);
+}
+
+struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *orig,
+ struct ip_conntrack_tuple *repl)
{
struct ip_conntrack *conntrack;
- struct ip_conntrack_tuple repl_tuple;
- size_t hash;
- struct ip_conntrack_expect *exp;
if (!ip_conntrack_hash_rnd_initted) {
get_random_bytes(&ip_conntrack_hash_rnd, 4);
ip_conntrack_hash_rnd_initted = 1;
}
- hash = hash_conntrack(tuple);
-
if (ip_conntrack_max
&& atomic_read(&ip_conntrack_count) >= ip_conntrack_max) {
+ unsigned int hash = hash_conntrack(orig);
/* Try dropping from this hash chain. */
if (!early_drop(&ip_conntrack_hash[hash])) {
if (net_ratelimit())
}
}
- if (!ip_ct_invert_tuple(&repl_tuple, tuple, protocol)) {
- DEBUGP("Can't invert tuple.\n");
- return NULL;
- }
-
conntrack = kmem_cache_alloc(ip_conntrack_cachep, GFP_ATOMIC);
if (!conntrack) {
DEBUGP("Can't allocate conntrack.\n");
memset(conntrack, 0, sizeof(*conntrack));
atomic_set(&conntrack->ct_general.use, 1);
conntrack->ct_general.destroy = destroy_conntrack;
- conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *tuple;
- conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = repl_tuple;
- if (!protocol->new(conntrack, skb)) {
- kmem_cache_free(ip_conntrack_cachep, conntrack);
- return NULL;
- }
+ conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
+ conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
/* Don't set timer yet: wait for confirmation */
init_timer(&conntrack->timeout);
conntrack->timeout.data = (unsigned long)conntrack;
conntrack->timeout.function = death_by_timeout;
- WRITE_LOCK(&ip_conntrack_lock);
+ atomic_inc(&ip_conntrack_count);
+
+ return conntrack;
+}
+
+void
+ip_conntrack_free(struct ip_conntrack *conntrack)
+{
+ atomic_dec(&ip_conntrack_count);
+ kmem_cache_free(ip_conntrack_cachep, conntrack);
+}
+
+/* Allocate a new conntrack: we return -ENOMEM if classification
+ * failed due to stress. Otherwise it really is unclassifiable */
+static struct ip_conntrack_tuple_hash *
+init_conntrack(struct ip_conntrack_tuple *tuple,
+ struct ip_conntrack_protocol *protocol,
+ struct sk_buff *skb)
+{
+ struct ip_conntrack *conntrack;
+ struct ip_conntrack_tuple repl_tuple;
+ struct ip_conntrack_expect *exp;
+
+ if (!ip_ct_invert_tuple(&repl_tuple, tuple, protocol)) {
+ DEBUGP("Can't invert tuple.\n");
+ return NULL;
+ }
+
+ conntrack = ip_conntrack_alloc(tuple, &repl_tuple);
+ if (conntrack == NULL || IS_ERR(conntrack))
+ return (struct ip_conntrack_tuple_hash *)conntrack;
+
+ if (!protocol->new(conntrack, skb)) {
+ ip_conntrack_free(conntrack);
+ return NULL;
+ }
+
+ write_lock_bh(&ip_conntrack_lock);
exp = find_expectation(tuple);
if (exp) {
/* Welcome, Mr. Bond. We've been expecting you... */
__set_bit(IPS_EXPECTED_BIT, &conntrack->status);
conntrack->master = exp->master;
-#if CONFIG_IP_NF_CONNTRACK_MARK
+#ifdef CONFIG_IP_NF_CONNTRACK_MARK
conntrack->mark = exp->master->mark;
+#endif
+#if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
+ defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
+ /* this is ugly, but there is no other place where to put it */
+ conntrack->nat.masq_index = exp->master->nat.masq_index;
#endif
nf_conntrack_get(&conntrack->master->ct_general);
CONNTRACK_STAT_INC(expect_new);
} else {
- conntrack->helper = ip_ct_find_helper(&repl_tuple);
+ conntrack->helper = __ip_conntrack_helper_find(&repl_tuple);
CONNTRACK_STAT_INC(new);
}
/* Overload tuple linked list to put us in unconfirmed list. */
list_add(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].list, &unconfirmed);
- atomic_inc(&ip_conntrack_count);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
if (exp) {
if (exp->expectfn)
exp->expectfn(conntrack, exp);
- destroy_expect(exp);
+ ip_conntrack_expect_put(exp);
}
return &conntrack->tuplehash[IP_CT_DIR_ORIGINAL];
struct ip_conntrack *ct;
enum ip_conntrack_info ctinfo;
struct ip_conntrack_protocol *proto;
- int set_reply;
+ int set_reply = 0;
int ret;
/* Previously seen (loopback or untracked)? Ignore. */
return NF_DROP;
}
- /* FIXME: Do this right please. --RR */
- (*pskb)->nfcache |= NFC_UNKNOWN;
-
/* Doesn't cover locally-generated broadcast, so not worth it. */
#if 0
/* Ignore broadcast: no `connection'. */
}
#endif
- proto = ip_ct_find_proto((*pskb)->nh.iph->protocol);
+ proto = __ip_conntrack_proto_find((*pskb)->nh.iph->protocol);
/* It may be an special packet, error, unclean...
* inverse of the return code tells to the netfilter
return -ret;
}
- if (set_reply)
- set_bit(IPS_SEEN_REPLY_BIT, &ct->status);
+ if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status))
+ ip_conntrack_event_cache(IPCT_STATUS, *pskb);
return ret;
}
const struct ip_conntrack_tuple *orig)
{
return ip_ct_invert_tuple(inverse, orig,
- ip_ct_find_proto(orig->dst.protonum));
+ __ip_conntrack_proto_find(orig->dst.protonum));
}
/* Would two expected things clash? */
{
struct ip_conntrack_expect *i;
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
/* choose the the oldest expectation to evict */
list_for_each_entry_reverse(i, &ip_conntrack_expect_list, list) {
if (expect_matches(i, exp) && del_timer(&i->timeout)) {
- unlink_expect(i);
- WRITE_UNLOCK(&ip_conntrack_lock);
- destroy_expect(i);
+ ip_ct_unlink_expect(i);
+ write_unlock_bh(&ip_conntrack_lock);
+ ip_conntrack_expect_put(i);
return;
}
}
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
}
-struct ip_conntrack_expect *ip_conntrack_expect_alloc(void)
+/* We don't increase the master conntrack refcount for non-fulfilled
+ * conntracks. During the conntrack destruction, the expectations are
+ * always killed before the conntrack itself */
+struct ip_conntrack_expect *ip_conntrack_expect_alloc(struct ip_conntrack *me)
{
struct ip_conntrack_expect *new;
DEBUGP("expect_related: OOM allocating expect\n");
return NULL;
}
- new->master = NULL;
+ new->master = me;
+ atomic_set(&new->use, 1);
return new;
}
-void ip_conntrack_expect_free(struct ip_conntrack_expect *expect)
+void ip_conntrack_expect_put(struct ip_conntrack_expect *exp)
{
- kmem_cache_free(ip_conntrack_expect_cachep, expect);
+ if (atomic_dec_and_test(&exp->use))
+ kmem_cache_free(ip_conntrack_expect_cachep, exp);
}
static void ip_conntrack_expect_insert(struct ip_conntrack_expect *exp)
{
- atomic_inc(&exp->master->ct_general.use);
+ atomic_inc(&exp->use);
exp->master->expecting++;
list_add(&exp->list, &ip_conntrack_expect_list);
- if (exp->master->helper->timeout) {
- init_timer(&exp->timeout);
- exp->timeout.data = (unsigned long)exp;
- exp->timeout.function = expectation_timed_out;
- exp->timeout.expires
- = jiffies + exp->master->helper->timeout * HZ;
- add_timer(&exp->timeout);
- } else
- exp->timeout.function = NULL;
+ init_timer(&exp->timeout);
+ exp->timeout.data = (unsigned long)exp;
+ exp->timeout.function = expectation_timed_out;
+ exp->timeout.expires = jiffies + exp->master->helper->timeout * HZ;
+ add_timer(&exp->timeout);
+ exp->id = ++ip_conntrack_expect_next_id;
+ atomic_inc(&exp->use);
CONNTRACK_STAT_INC(expect_create);
}
list_for_each_entry_reverse(i, &ip_conntrack_expect_list, list) {
if (i->master == master) {
if (del_timer(&i->timeout)) {
- unlink_expect(i);
- destroy_expect(i);
+ ip_ct_unlink_expect(i);
+ ip_conntrack_expect_put(i);
}
break;
}
DEBUGP("tuple: "); DUMP_TUPLE(&expect->tuple);
DEBUGP("mask: "); DUMP_TUPLE(&expect->mask);
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
list_for_each_entry(i, &ip_conntrack_expect_list, list) {
if (expect_matches(i, expect)) {
/* Refresh timer: if it's dying, ignore.. */
if (refresh_timer(i)) {
ret = 0;
- /* We don't need the one they've given us. */
- ip_conntrack_expect_free(expect);
goto out;
}
} else if (expect_clash(i, expect)) {
evict_oldest_expect(expect->master);
ip_conntrack_expect_insert(expect);
+ ip_conntrack_expect_event(IPEXP_NEW, expect);
ret = 0;
out:
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
return ret;
}
void ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
const struct ip_conntrack_tuple *newreply)
{
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
/* Should be unconfirmed, so not in hash table yet */
IP_NF_ASSERT(!is_confirmed(conntrack));
conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
if (!conntrack->master && conntrack->expecting == 0)
- conntrack->helper = ip_ct_find_helper(newreply);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ conntrack->helper = __ip_conntrack_helper_find(newreply);
+ write_unlock_bh(&ip_conntrack_lock);
}
int ip_conntrack_helper_register(struct ip_conntrack_helper *me)
{
BUG_ON(me->timeout == 0);
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
list_prepend(&helpers, me);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
return 0;
}
+struct ip_conntrack_helper *
+__ip_conntrack_helper_find_byname(const char *name)
+{
+ struct ip_conntrack_helper *h;
+
+ list_for_each_entry(h, &helpers, list) {
+ if (!strcmp(h->name, name))
+ return h;
+ }
+
+ return NULL;
+}
+
static inline int unhelp(struct ip_conntrack_tuple_hash *i,
const struct ip_conntrack_helper *me)
{
- if (tuplehash_to_ctrack(i)->helper == me)
+ if (tuplehash_to_ctrack(i)->helper == me) {
+ ip_conntrack_event(IPCT_HELPER, tuplehash_to_ctrack(i));
tuplehash_to_ctrack(i)->helper = NULL;
+ }
return 0;
}
struct ip_conntrack_expect *exp, *tmp;
/* Need write lock here, to delete helper. */
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
LIST_DELETE(&helpers, me);
/* Get rid of expectations */
list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list, list) {
if (exp->master->helper == me && del_timer(&exp->timeout)) {
- unlink_expect(exp);
- destroy_expect(exp);
+ ip_ct_unlink_expect(exp);
+ ip_conntrack_expect_put(exp);
}
}
/* Get rid of expecteds, set helpers to NULL. */
for (i = 0; i < ip_conntrack_htable_size; i++)
LIST_FIND_W(&ip_conntrack_hash[i], unhelp,
struct ip_conntrack_tuple_hash *, me);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
/* Someone could be still looking at the helper in a bh. */
synchronize_net();
}
-static inline void ct_add_counters(struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- const struct sk_buff *skb)
-{
-#ifdef CONFIG_IP_NF_CT_ACCT
- if (skb) {
- ct->counters[CTINFO2DIR(ctinfo)].packets++;
- ct->counters[CTINFO2DIR(ctinfo)].bytes +=
- ntohs(skb->nh.iph->tot_len);
- }
-#endif
-}
-
-/* Refresh conntrack for this many jiffies and do accounting (if skb != NULL) */
-void ip_ct_refresh_acct(struct ip_conntrack *ct,
+/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
+void __ip_ct_refresh_acct(struct ip_conntrack *ct,
enum ip_conntrack_info ctinfo,
const struct sk_buff *skb,
- unsigned long extra_jiffies)
+ unsigned long extra_jiffies,
+ int do_acct)
{
+ int event = 0;
+
IP_NF_ASSERT(ct->timeout.data == (unsigned long)ct);
+ IP_NF_ASSERT(skb);
+
+ write_lock_bh(&ip_conntrack_lock);
/* If not in hash table, timer will not be active yet */
if (!is_confirmed(ct)) {
ct->timeout.expires = extra_jiffies;
- ct_add_counters(ct, ctinfo, skb);
+ event = IPCT_REFRESH;
} else {
- WRITE_LOCK(&ip_conntrack_lock);
/* Need del_timer for race avoidance (may already be dying). */
if (del_timer(&ct->timeout)) {
ct->timeout.expires = jiffies + extra_jiffies;
add_timer(&ct->timeout);
+ event = IPCT_REFRESH;
}
- ct_add_counters(ct, ctinfo, skb);
- WRITE_UNLOCK(&ip_conntrack_lock);
}
+
+#ifdef CONFIG_IP_NF_CT_ACCT
+ if (do_acct) {
+ ct->counters[CTINFO2DIR(ctinfo)].packets++;
+ ct->counters[CTINFO2DIR(ctinfo)].bytes +=
+ ntohs(skb->nh.iph->tot_len);
+ if ((ct->counters[CTINFO2DIR(ctinfo)].packets & 0x80000000)
+ || (ct->counters[CTINFO2DIR(ctinfo)].bytes & 0x80000000))
+ event |= IPCT_COUNTER_FILLING;
+ }
+#endif
+
+ write_unlock_bh(&ip_conntrack_lock);
+
+ /* must be unlocked when calling event cache */
+ if (event)
+ ip_conntrack_event_cache(event, skb);
+}
+
+#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
+ defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
+/* Generic function for tcp/udp/sctp/dccp and alike. This needs to be
+ * in ip_conntrack_core, since we don't want the protocols to autoload
+ * or depend on ctnetlink */
+int ip_ct_port_tuple_to_nfattr(struct sk_buff *skb,
+ const struct ip_conntrack_tuple *tuple)
+{
+ NFA_PUT(skb, CTA_PROTO_SRC_PORT, sizeof(u_int16_t),
+ &tuple->src.u.tcp.port);
+ NFA_PUT(skb, CTA_PROTO_DST_PORT, sizeof(u_int16_t),
+ &tuple->dst.u.tcp.port);
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+
+int ip_ct_port_nfattr_to_tuple(struct nfattr *tb[],
+ struct ip_conntrack_tuple *t)
+{
+ if (!tb[CTA_PROTO_SRC_PORT-1] || !tb[CTA_PROTO_DST_PORT-1])
+ return -EINVAL;
+
+ t->src.u.tcp.port =
+ *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_SRC_PORT-1]);
+ t->dst.u.tcp.port =
+ *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_DST_PORT-1]);
+
+ return 0;
}
+#endif
/* Returns new sk_buff, or NULL */
struct sk_buff *
ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user)
{
-#ifdef CONFIG_NETFILTER_DEBUG
- unsigned int olddebug = skb->nf_debug;
-#endif
-
skb_orphan(skb);
local_bh_disable();
skb = ip_defrag(skb, user);
local_bh_enable();
- if (skb) {
+ if (skb)
ip_send_check(skb->nh.iph);
- skb->nfcache |= NFC_ALTERED;
-#ifdef CONFIG_NETFILTER_DEBUG
- /* Packet path as if nothing had happened. */
- skb->nf_debug = olddebug;
-#endif
- }
-
return skb;
}
{
struct ip_conntrack_tuple_hash *h = NULL;
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
for (; *bucket < ip_conntrack_htable_size; (*bucket)++) {
h = LIST_FIND_W(&ip_conntrack_hash[*bucket], do_iter,
struct ip_conntrack_tuple_hash *, iter, data);
struct ip_conntrack_tuple_hash *, iter, data);
if (h)
atomic_inc(&tuplehash_to_ctrack(h)->ct_general.use);
- WRITE_UNLOCK(&ip_conntrack_lock);
+ write_unlock_bh(&ip_conntrack_lock);
return h;
}
.tuple.dst.u.tcp.port;
sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.dst.ip;
+ memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n",
NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
return 1;
}
-static void free_conntrack_hash(void)
+void ip_conntrack_flush(void)
{
- if (ip_conntrack_vmalloc)
- vfree(ip_conntrack_hash);
+ ip_ct_iterate_cleanup(kill_all, NULL);
+}
+
+static void free_conntrack_hash(struct list_head *hash, int vmalloced,int size)
+{
+ if (vmalloced)
+ vfree(hash);
else
- free_pages((unsigned long)ip_conntrack_hash,
- get_order(sizeof(struct list_head)
- * ip_conntrack_htable_size));
+ free_pages((unsigned long)hash,
+ get_order(sizeof(struct list_head) * size));
}
/* Mishearing the voices in his head, our hero wonders how he's
void ip_conntrack_cleanup(void)
{
ip_ct_attach = NULL;
+
/* This makes sure all current packets have passed through
netfilter framework. Roll on, two-stage module
delete... */
synchronize_net();
-
+
+ ip_ct_event_cache_flush();
i_see_dead_people:
- ip_ct_iterate_cleanup(kill_all, NULL);
+ ip_conntrack_flush();
if (atomic_read(&ip_conntrack_count) != 0) {
schedule();
goto i_see_dead_people;
}
+ /* wait until all references to ip_conntrack_untracked are dropped */
+ while (atomic_read(&ip_conntrack_untracked.ct_general.use) > 1)
+ schedule();
kmem_cache_destroy(ip_conntrack_cachep);
kmem_cache_destroy(ip_conntrack_expect_cachep);
- free_conntrack_hash();
+ free_conntrack_hash(ip_conntrack_hash, ip_conntrack_vmalloc,
+ ip_conntrack_htable_size);
nf_unregister_sockopt(&so_getorigdst);
}
-static int hashsize;
-module_param(hashsize, int, 0400);
+static struct list_head *alloc_hashtable(int size, int *vmalloced)
+{
+ struct list_head *hash;
+ unsigned int i;
+
+ *vmalloced = 0;
+ hash = (void*)__get_free_pages(GFP_KERNEL,
+ get_order(sizeof(struct list_head)
+ * size));
+ if (!hash) {
+ *vmalloced = 1;
+ printk(KERN_WARNING"ip_conntrack: falling back to vmalloc.\n");
+ hash = vmalloc(sizeof(struct list_head) * size);
+ }
+
+ if (hash)
+ for (i = 0; i < size; i++)
+ INIT_LIST_HEAD(&hash[i]);
+
+ return hash;
+}
+
+static int set_hashsize(const char *val, struct kernel_param *kp)
+{
+ int i, bucket, hashsize, vmalloced;
+ int old_vmalloced, old_size;
+ int rnd;
+ struct list_head *hash, *old_hash;
+ struct ip_conntrack_tuple_hash *h;
+
+ /* On boot, we can set this without any fancy locking. */
+ if (!ip_conntrack_htable_size)
+ return param_set_int(val, kp);
+
+ hashsize = simple_strtol(val, NULL, 0);
+ if (!hashsize)
+ return -EINVAL;
+
+ hash = alloc_hashtable(hashsize, &vmalloced);
+ if (!hash)
+ return -ENOMEM;
+
+ /* We have to rehash for the new table anyway, so we also can
+ * use a new random seed */
+ get_random_bytes(&rnd, 4);
+
+ write_lock_bh(&ip_conntrack_lock);
+ for (i = 0; i < ip_conntrack_htable_size; i++) {
+ while (!list_empty(&ip_conntrack_hash[i])) {
+ h = list_entry(ip_conntrack_hash[i].next,
+ struct ip_conntrack_tuple_hash, list);
+ list_del(&h->list);
+ bucket = __hash_conntrack(&h->tuple, hashsize, rnd);
+ list_add_tail(&h->list, &hash[bucket]);
+ }
+ }
+ old_size = ip_conntrack_htable_size;
+ old_vmalloced = ip_conntrack_vmalloc;
+ old_hash = ip_conntrack_hash;
+
+ ip_conntrack_htable_size = hashsize;
+ ip_conntrack_vmalloc = vmalloced;
+ ip_conntrack_hash = hash;
+ ip_conntrack_hash_rnd = rnd;
+ write_unlock_bh(&ip_conntrack_lock);
+
+ free_conntrack_hash(old_hash, old_vmalloced, old_size);
+ return 0;
+}
+
+module_param_call(hashsize, set_hashsize, param_get_uint,
+ &ip_conntrack_htable_size, 0600);
int __init ip_conntrack_init(void)
{
/* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB
* machine has 256 buckets. >= 1GB machines have 8192 buckets. */
- if (hashsize) {
- ip_conntrack_htable_size = hashsize;
- } else {
+ if (!ip_conntrack_htable_size) {
ip_conntrack_htable_size
= (((num_physpages << PAGE_SHIFT) / 16384)
/ sizeof(struct list_head));
return ret;
}
- /* AK: the hash table is twice as big than needed because it
- uses list_head. it would be much nicer to caches to use a
- single pointer list head here. */
- ip_conntrack_vmalloc = 0;
- ip_conntrack_hash
- =(void*)__get_free_pages(GFP_KERNEL,
- get_order(sizeof(struct list_head)
- *ip_conntrack_htable_size));
- if (!ip_conntrack_hash) {
- ip_conntrack_vmalloc = 1;
- printk(KERN_WARNING "ip_conntrack: falling back to vmalloc.\n");
- ip_conntrack_hash = vmalloc(sizeof(struct list_head)
- * ip_conntrack_htable_size);
- }
+ ip_conntrack_hash = alloc_hashtable(ip_conntrack_htable_size,
+ &ip_conntrack_vmalloc);
if (!ip_conntrack_hash) {
printk(KERN_ERR "Unable to create ip_conntrack_hash\n");
goto err_unreg_sockopt;
}
/* Don't NEED lock here, but good form anyway. */
- WRITE_LOCK(&ip_conntrack_lock);
+ write_lock_bh(&ip_conntrack_lock);
for (i = 0; i < MAX_IP_CT_PROTO; i++)
ip_ct_protos[i] = &ip_conntrack_generic_protocol;
/* Sew in builtin protocols. */
ip_ct_protos[IPPROTO_TCP] = &ip_conntrack_protocol_tcp;
ip_ct_protos[IPPROTO_UDP] = &ip_conntrack_protocol_udp;
ip_ct_protos[IPPROTO_ICMP] = &ip_conntrack_protocol_icmp;
- WRITE_UNLOCK(&ip_conntrack_lock);
-
- for (i = 0; i < ip_conntrack_htable_size; i++)
- INIT_LIST_HEAD(&ip_conntrack_hash[i]);
+ write_unlock_bh(&ip_conntrack_lock);
/* For use by ipt_REJECT */
ip_ct_attach = ip_conntrack_attach;
err_free_conntrack_slab:
kmem_cache_destroy(ip_conntrack_cachep);
err_free_hash:
- free_conntrack_hash();
+ free_conntrack_hash(ip_conntrack_hash, ip_conntrack_vmalloc,
+ ip_conntrack_htable_size);
err_unreg_sockopt:
nf_unregister_sockopt(&so_getorigdst);
git://git.onelab.eu / linux-2.6.git / blobdiff