static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple,
unsigned int size, unsigned int rnd)
{
- unsigned int a, b;
+ unsigned int n;
+ u_int32_t h;
- a = jhash2(tuple->src.u3.all, ARRAY_SIZE(tuple->src.u3.all),
- (tuple->src.l3num << 16) | tuple->dst.protonum);
- b = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all),
- ((__force __u16)tuple->src.u.all << 16) |
- (__force __u16)tuple->dst.u.all);
+ /* The direction must be ignored, so we hash everything up to the
+ * destination ports (which is a multiple of 4) and treat the last
+ * three bytes manually.
+ */
+ n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32);
+ h = jhash2((u32 *)tuple, n,
+ rnd ^ (((__force __u16)tuple->dst.u.all << 16) |
+ tuple->dst.protonum));
- return ((u64)jhash_2words(a, b, rnd) * size) >> 32;
+ return ((u64)h * size) >> 32;
}
static inline u_int32_t hash_conntrack(const struct nf_conntrack_tuple *tuple)
}
struct nf_conntrack_tuple_hash *
-__nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
- const struct nf_conn *ignored_conntrack)
+__nf_conntrack_find(const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_tuple_hash *h;
struct hlist_node *n;
unsigned int hash = hash_conntrack(tuple);
hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[hash], hnode) {
- if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack &&
- nf_ct_tuple_equal(tuple, &h->tuple)) {
+ if (nf_ct_tuple_equal(tuple, &h->tuple)) {
NF_CT_STAT_INC(found);
return h;
}
struct nf_conn *ct;
rcu_read_lock();
- h = __nf_conntrack_find(tuple, NULL);
+ h = __nf_conntrack_find(tuple);
if (h) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
const struct nf_conn *ignored_conntrack)
{
struct nf_conntrack_tuple_hash *h;
+ struct hlist_node *n;
+ unsigned int hash = hash_conntrack(tuple);
rcu_read_lock();
- h = __nf_conntrack_find(tuple, ignored_conntrack);
+ hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[hash], hnode) {
+ if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack &&
+ nf_ct_tuple_equal(tuple, &h->tuple)) {
+ NF_CT_STAT_INC(found);
+ rcu_read_unlock();
+ return 1;
+ }
+ NF_CT_STAT_INC(searched);
+ }
rcu_read_unlock();
- return h != NULL;
+ return 0;
}
EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken);
/* There's a small race here where we may free a just-assured
connection. Too bad: we're in trouble anyway. */
-static int early_drop(unsigned int hash)
+static noinline int early_drop(unsigned int hash)
{
/* Use oldest entry, which is roughly LRU */
struct nf_conntrack_tuple_hash *h;
struct nf_conn *nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_tuple *repl)
{
- struct nf_conn *conntrack = NULL;
+ struct nf_conn *ct = NULL;
if (unlikely(!nf_conntrack_hash_rnd_initted)) {
get_random_bytes(&nf_conntrack_hash_rnd, 4);
/* We don't want any race condition at early drop stage */
atomic_inc(&nf_conntrack_count);
- if (nf_conntrack_max
- && atomic_read(&nf_conntrack_count) > nf_conntrack_max) {
+ if (nf_conntrack_max &&
+ unlikely(atomic_read(&nf_conntrack_count) > nf_conntrack_max)) {
unsigned int hash = hash_conntrack(orig);
if (!early_drop(hash)) {
atomic_dec(&nf_conntrack_count);
}
}
- conntrack = kmem_cache_zalloc(nf_conntrack_cachep, GFP_ATOMIC);
- if (conntrack == NULL) {
+ ct = kmem_cache_zalloc(nf_conntrack_cachep, GFP_ATOMIC);
+ if (ct == NULL) {
pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n");
atomic_dec(&nf_conntrack_count);
return ERR_PTR(-ENOMEM);
}
- atomic_set(&conntrack->ct_general.use, 1);
- conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
- conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
+ atomic_set(&ct->ct_general.use, 1);
+ ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
+ ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
/* Don't set timer yet: wait for confirmation */
- setup_timer(&conntrack->timeout, death_by_timeout,
- (unsigned long)conntrack);
- INIT_RCU_HEAD(&conntrack->rcu);
+ setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct);
+ INIT_RCU_HEAD(&ct->rcu);
- return conntrack;
+ return ct;
}
EXPORT_SYMBOL_GPL(nf_conntrack_alloc);
atomic_dec(&nf_conntrack_count);
}
-void nf_conntrack_free(struct nf_conn *conntrack)
+void nf_conntrack_free(struct nf_conn *ct)
{
- call_rcu(&conntrack->rcu, nf_conntrack_free_rcu);
+ call_rcu(&ct->rcu, nf_conntrack_free_rcu);
}
EXPORT_SYMBOL_GPL(nf_conntrack_free);
struct sk_buff *skb,
unsigned int dataoff)
{
- struct nf_conn *conntrack;
+ struct nf_conn *ct;
struct nf_conn_help *help;
struct nf_conntrack_tuple repl_tuple;
struct nf_conntrack_expect *exp;
return NULL;
}
- conntrack = nf_conntrack_alloc(tuple, &repl_tuple);
- if (conntrack == NULL || IS_ERR(conntrack)) {
+ ct = nf_conntrack_alloc(tuple, &repl_tuple);
+ if (ct == NULL || IS_ERR(ct)) {
pr_debug("Can't allocate conntrack.\n");
- return (struct nf_conntrack_tuple_hash *)conntrack;
+ return (struct nf_conntrack_tuple_hash *)ct;
}
- if (!l4proto->new(conntrack, skb, dataoff)) {
- nf_conntrack_free(conntrack);
+ if (!l4proto->new(ct, skb, dataoff)) {
+ nf_conntrack_free(ct);
pr_debug("init conntrack: can't track with proto module\n");
return NULL;
}
exp = nf_ct_find_expectation(tuple);
if (exp) {
pr_debug("conntrack: expectation arrives ct=%p exp=%p\n",
- conntrack, exp);
+ ct, exp);
/* Welcome, Mr. Bond. We've been expecting you... */
- __set_bit(IPS_EXPECTED_BIT, &conntrack->status);
- conntrack->master = exp->master;
+ __set_bit(IPS_EXPECTED_BIT, &ct->status);
+ ct->master = exp->master;
if (exp->helper) {
- help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC);
+ help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
if (help)
rcu_assign_pointer(help->helper, exp->helper);
}
#ifdef CONFIG_NF_CONNTRACK_MARK
- conntrack->mark = exp->master->mark;
+ ct->mark = exp->master->mark;
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
- conntrack->secmark = exp->master->secmark;
+ ct->secmark = exp->master->secmark;
#endif
- nf_conntrack_get(&conntrack->master->ct_general);
+ nf_conntrack_get(&ct->master->ct_general);
NF_CT_STAT_INC(expect_new);
} else {
struct nf_conntrack_helper *helper;
helper = __nf_ct_helper_find(&repl_tuple);
if (helper) {
- help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC);
+ help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
if (help)
rcu_assign_pointer(help->helper, helper);
}
}
/* Overload tuple linked list to put us in unconfirmed list. */
- hlist_add_head(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
- &unconfirmed);
+ hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode, &unconfirmed);
spin_unlock_bh(&nf_conntrack_lock);
if (exp) {
if (exp->expectfn)
- exp->expectfn(conntrack, exp);
+ exp->expectfn(ct, exp);
nf_ct_expect_put(exp);
}
- return &conntrack->tuplehash[IP_CT_DIR_ORIGINAL];
+ return &ct->tuplehash[IP_CT_DIR_ORIGINAL];
}
/* On success, returns conntrack ptr, sets skb->nfct and ctinfo */
nf_conntrack_get(nskb->nfct);
}
-static inline int
-do_iter(const struct nf_conntrack_tuple_hash *i,
- int (*iter)(struct nf_conn *i, void *data),
- void *data)
-{
- return iter(nf_ct_tuplehash_to_ctrack(i), data);
-}
-
/* Bring out ya dead! */
static struct nf_conn *
get_next_corpse(int (*iter)(struct nf_conn *i, void *data),
projects / linux-2.6 / blobdiff