static LIST_HEAD(unconfirmed);
static int nf_conntrack_vmalloc;
+static unsigned int nf_conntrack_next_id = 1;
+static unsigned int nf_conntrack_expect_next_id = 1;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
struct notifier_block *nf_conntrack_chain;
struct notifier_block *nf_conntrack_expect_chain;
extern struct nf_conntrack_protocol nf_conntrack_generic_protocol;
struct nf_conntrack_protocol *
-nf_ct_find_proto(u_int16_t l3proto, u_int8_t protocol)
+__nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol)
{
if (unlikely(nf_ct_protos[l3proto] == NULL))
return &nf_conntrack_generic_protocol;
return nf_ct_protos[l3proto][protocol];
}
+/* this is guaranteed to always return a valid protocol helper, since
+ * it falls back to generic_protocol */
+struct nf_conntrack_protocol *
+nf_ct_proto_find_get(u_int16_t l3proto, u_int8_t protocol)
+{
+ struct nf_conntrack_protocol *p;
+
+ preempt_disable();
+ p = __nf_ct_proto_find(l3proto, protocol);
+ if (p) {
+ if (!try_module_get(p->me))
+ p = &nf_conntrack_generic_protocol;
+ }
+ preempt_enable();
+
+ return p;
+}
+
+void nf_ct_proto_put(struct nf_conntrack_protocol *p)
+{
+ module_put(p->me);
+}
+
+struct nf_conntrack_l3proto *
+nf_ct_l3proto_find_get(u_int16_t l3proto)
+{
+ struct nf_conntrack_l3proto *p;
+
+ preempt_disable();
+ p = __nf_ct_l3proto_find(l3proto);
+ if (p) {
+ if (!try_module_get(p->me))
+ p = &nf_conntrack_generic_l3proto;
+ }
+ preempt_enable();
+
+ return p;
+}
+
+void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
+{
+ module_put(p->me);
+}
+
static int nf_conntrack_hash_rnd_initted;
static unsigned int nf_conntrack_hash_rnd;
}
/* nf_conntrack_expect helper functions */
-static void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
+void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
{
ASSERT_WRITE_LOCK(&nf_conntrack_lock);
NF_CT_ASSERT(!timer_pending(&exp->timeout));
nf_conntrack_expect_put(exp);
}
+struct nf_conntrack_expect *
+__nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple)
+{
+ struct nf_conntrack_expect *i;
+
+ list_for_each_entry(i, &nf_conntrack_expect_list, list) {
+ if (nf_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 nf_conntrack_expect *
+nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple)
+{
+ struct nf_conntrack_expect *i;
+
+ read_lock_bh(&nf_conntrack_lock);
+ i = __nf_conntrack_expect_find(tuple);
+ read_unlock_bh(&nf_conntrack_lock);
+
+ return i;
+}
+
/* If an expectation for this connection is found, it gets delete from
* global list then returned. */
static struct nf_conntrack_expect *
}
/* delete all expectations for this conntrack */
-static void remove_expectations(struct nf_conn *ct)
+void nf_ct_remove_expectations(struct nf_conn *ct)
{
struct nf_conntrack_expect *i, *tmp;
LIST_DELETE(&nf_conntrack_hash[hr], &ct->tuplehash[IP_CT_DIR_REPLY]);
/* Destroy all pending expectations */
- remove_expectations(ct);
+ nf_ct_remove_expectations(ct);
}
static void
/* To make sure we don't get any weird locking issues here:
* destroy_conntrack() MUST NOT be called with a write lock
* to nf_conntrack_lock!!! -HW */
- l3proto = nf_ct_find_l3proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num);
+ l3proto = __nf_ct_l3proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num);
if (l3proto && l3proto->destroy)
l3proto->destroy(ct);
- proto = nf_ct_find_proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num,
- ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
+ proto = __nf_ct_proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
if (proto && proto->destroy)
proto->destroy(ct);
* 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);
+ nf_ct_remove_expectations(ct);
/* We overload first tuple to link into unconfirmed list. */
if (!nf_ct_is_confirmed(ct)) {
&& nf_ct_tuple_equal(tuple, &i->tuple);
}
-static struct nf_conntrack_tuple_hash *
+struct nf_conntrack_tuple_hash *
__nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
const struct nf_conn *ignored_conntrack)
{
return h;
}
+static void __nf_conntrack_hash_insert(struct nf_conn *ct,
+ unsigned int hash,
+ unsigned int repl_hash)
+{
+ ct->id = ++nf_conntrack_next_id;
+ list_prepend(&nf_conntrack_hash[hash],
+ &ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
+ list_prepend(&nf_conntrack_hash[repl_hash],
+ &ct->tuplehash[IP_CT_DIR_REPLY].list);
+}
+
+void nf_conntrack_hash_insert(struct nf_conn *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(&nf_conntrack_lock);
+ __nf_conntrack_hash_insert(ct, hash, repl_hash);
+ write_unlock_bh(&nf_conntrack_lock);
+}
+
/* Confirm a connection given skb; places it in hash table */
int
__nf_conntrack_confirm(struct sk_buff **pskb)
/* Remove from unconfirmed list */
list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
- list_prepend(&nf_conntrack_hash[hash],
- &ct->tuplehash[IP_CT_DIR_ORIGINAL]);
- list_prepend(&nf_conntrack_hash[repl_hash],
- &ct->tuplehash[IP_CT_DIR_REPLY]);
+ __nf_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. */
}
static struct nf_conntrack_helper *
-nf_ct_find_helper(const struct nf_conntrack_tuple *tuple)
+__nf_ct_helper_find(const struct nf_conntrack_tuple *tuple)
{
return LIST_FIND(&helpers, helper_cmp,
struct nf_conntrack_helper *,
tuple);
}
+struct nf_conntrack_helper *
+nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple)
+{
+ struct nf_conntrack_helper *helper;
+
+ /* need nf_conntrack_lock to assure that helper exists until
+ * try_module_get() is called */
+ read_lock_bh(&nf_conntrack_lock);
+
+ helper = __nf_ct_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(&nf_conntrack_lock);
+
+ return helper;
+}
+
+void nf_ct_helper_put(struct nf_conntrack_helper *helper)
+{
+ module_put(helper->me);
+}
+
static struct nf_conn *
__nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_tuple *repl,
/* find features needed by this conntrack. */
features = l3proto->get_features(orig);
read_lock_bh(&nf_conntrack_lock);
- if (nf_ct_find_helper(repl) != NULL)
+ if (__nf_ct_helper_find(repl) != NULL)
features |= NF_CT_F_HELP;
read_unlock_bh(&nf_conntrack_lock);
{
struct nf_conntrack_l3proto *l3proto;
- l3proto = nf_ct_find_l3proto(orig->src.l3num);
+ l3proto = __nf_ct_l3proto_find(orig->src.l3num);
return __nf_conntrack_alloc(orig, repl, l3proto);
}
nf_conntrack_get(&conntrack->master->ct_general);
NF_CT_STAT_INC(expect_new);
} else {
- conntrack->helper = nf_ct_find_helper(&repl_tuple);
+ conntrack->helper = __nf_ct_helper_find(&repl_tuple);
NF_CT_STAT_INC(new);
}
return NF_ACCEPT;
}
- l3proto = nf_ct_find_l3proto((u_int16_t)pf);
+ l3proto = __nf_ct_l3proto_find((u_int16_t)pf);
if ((ret = l3proto->prepare(pskb, hooknum, &dataoff, &protonum)) <= 0) {
DEBUGP("not prepared to track yet or error occured\n");
return -ret;
}
- proto = nf_ct_find_proto((u_int16_t)pf, protonum);
+ proto = __nf_ct_proto_find((u_int16_t)pf, protonum);
/* It may be an special packet, error, unclean...
* inverse of the return code tells to the netfilter
const struct nf_conntrack_tuple *orig)
{
return nf_ct_invert_tuple(inverse, orig,
- nf_ct_find_l3proto(orig->src.l3num),
- nf_ct_find_proto(orig->src.l3num,
- orig->dst.protonum));
+ __nf_ct_l3proto_find(orig->src.l3num),
+ __nf_ct_proto_find(orig->src.l3num,
+ orig->dst.protonum));
}
/* Would two expected things clash? */
exp->timeout.expires = jiffies + exp->master->helper->timeout * HZ;
add_timer(&exp->timeout);
+ exp->id = ++nf_conntrack_expect_next_id;
atomic_inc(&exp->use);
NF_CT_STAT_INC(expect_create);
}
conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
if (!conntrack->master && conntrack->expecting == 0)
- conntrack->helper = nf_ct_find_helper(newreply);
+ conntrack->helper = __nf_ct_helper_find(newreply);
write_unlock_bh(&nf_conntrack_lock);
}
return 0;
}
+struct nf_conntrack_helper *
+__nf_conntrack_helper_find_byname(const char *name)
+{
+ struct nf_conntrack_helper *h;
+
+ list_for_each_entry(h, &helpers, list) {
+ if (!strcmp(h->name, name))
+ return h;
+ }
+
+ return NULL;
+}
+
static inline int unhelp(struct nf_conntrack_tuple_hash *i,
const struct nf_conntrack_helper *me)
{
nf_conntrack_event_cache(event, skb);
}
+#if defined(CONFIG_NF_CT_NETLINK) || \
+ defined(CONFIG_NF_CT_NETLINK_MODULE)
+
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_conntrack.h>
+
+/* 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 nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,
+ const struct nf_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;
+}
+
+static const size_t cta_min_proto[CTA_PROTO_MAX] = {
+ [CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
+ [CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t)
+};
+
+int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[],
+ struct nf_conntrack_tuple *t)
+{
+ if (!tb[CTA_PROTO_SRC_PORT-1] || !tb[CTA_PROTO_DST_PORT-1])
+ return -EINVAL;
+
+ if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
+ 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
+
/* Used by ipt_REJECT and ip6t_REJECT. */
void __nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb)
{
get_order(sizeof(struct list_head) * size));
}
+void nf_conntrack_flush()
+{
+ nf_ct_iterate_cleanup(kill_all, NULL);
+}
+
/* Mishearing the voices in his head, our hero wonders how he's
supposed to kill the mall. */
void nf_conntrack_cleanup(void)
nf_ct_event_cache_flush();
i_see_dead_people:
- nf_ct_iterate_cleanup(kill_all, NULL);
+ nf_conntrack_flush();
if (atomic_read(&nf_conntrack_count) != 0) {
schedule();
goto i_see_dead_people;
projects / linux-2.6-omap-h63xx.git / blobdiff