#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
-static DEFINE_RWLOCK(nf_nat_lock);
+static DEFINE_SPINLOCK(nf_nat_lock);
-static struct nf_conntrack_l3proto *l3proto = NULL;
+static struct nf_conntrack_l3proto *l3proto __read_mostly;
/* Calculated at init based on memory size */
-static unsigned int nf_nat_htable_size;
+static unsigned int nf_nat_htable_size __read_mostly;
static int nf_nat_vmalloced;
-static struct hlist_head *bysource;
+static struct hlist_head *bysource __read_mostly;
#define MAX_IP_NAT_PROTO 256
-static struct nf_nat_protocol *nf_nat_protos[MAX_IP_NAT_PROTO];
+static const struct nf_nat_protocol *nf_nat_protos[MAX_IP_NAT_PROTO]
+ __read_mostly;
-static inline struct nf_nat_protocol *
+static inline const struct nf_nat_protocol *
__nf_nat_proto_find(u_int8_t protonum)
{
return rcu_dereference(nf_nat_protos[protonum]);
}
-struct nf_nat_protocol *
+const struct nf_nat_protocol *
nf_nat_proto_find_get(u_int8_t protonum)
{
- struct nf_nat_protocol *p;
+ const struct nf_nat_protocol *p;
rcu_read_lock();
p = __nf_nat_proto_find(protonum);
EXPORT_SYMBOL_GPL(nf_nat_proto_find_get);
void
-nf_nat_proto_put(struct nf_nat_protocol *p)
+nf_nat_proto_put(const struct nf_nat_protocol *p)
{
module_put(p->me);
}
static inline unsigned int
hash_by_src(const struct nf_conntrack_tuple *tuple)
{
+ unsigned int hash;
+
/* Original src, to ensure we map it consistently if poss. */
- return jhash_3words((__force u32)tuple->src.u3.ip,
+ hash = jhash_3words((__force u32)tuple->src.u3.ip,
(__force u32)tuple->src.u.all,
- tuple->dst.protonum, 0) % nf_nat_htable_size;
+ tuple->dst.protonum, 0);
+ return ((u64)hash * nf_nat_htable_size) >> 32;
}
/* Is this tuple already taken? (not by us) */
in_range(const struct nf_conntrack_tuple *tuple,
const struct nf_nat_range *range)
{
- struct nf_nat_protocol *proto;
+ const struct nf_nat_protocol *proto;
int ret = 0;
/* If we are supposed to map IPs, then we must be in the
struct nf_conn *ct;
struct hlist_node *n;
- read_lock_bh(&nf_nat_lock);
- hlist_for_each_entry(nat, n, &bysource[h], bysource) {
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(nat, n, &bysource[h], bysource) {
ct = nat->ct;
if (same_src(ct, tuple)) {
/* Copy source part from reply tuple. */
result->dst = tuple->dst;
if (in_range(result, range)) {
- read_unlock_bh(&nf_nat_lock);
+ rcu_read_unlock();
return 1;
}
}
}
- read_unlock_bh(&nf_nat_lock);
+ rcu_read_unlock();
return 0;
}
maxip = ntohl(range->max_ip);
j = jhash_2words((__force u32)tuple->src.u3.ip,
(__force u32)tuple->dst.u3.ip, 0);
- *var_ipp = htonl(minip + j % (maxip - minip + 1));
+ j = ((u64)j * (maxip - minip + 1)) >> 32;
+ *var_ipp = htonl(minip + j);
}
-/* Manipulate the tuple into the range given. For NF_IP_POST_ROUTING,
- * we change the source to map into the range. For NF_IP_PRE_ROUTING
- * and NF_IP_LOCAL_OUT, we change the destination to map into the
+/* Manipulate the tuple into the range given. For NF_INET_POST_ROUTING,
+ * we change the source to map into the range. For NF_INET_PRE_ROUTING
+ * and NF_INET_LOCAL_OUT, we change the destination to map into the
* range. It might not be possible to get a unique tuple, but we try.
* At worst (or if we race), we will end up with a final duplicate in
* __ip_conntrack_confirm and drop the packet. */
struct nf_conn *ct,
enum nf_nat_manip_type maniptype)
{
- struct nf_nat_protocol *proto;
+ const struct nf_nat_protocol *proto;
/* 1) If this srcip/proto/src-proto-part is currently mapped,
and that same mapping gives a unique tuple within the given
unsigned int
nf_nat_setup_info(struct nf_conn *ct,
const struct nf_nat_range *range,
- unsigned int hooknum)
+ enum nf_nat_manip_type maniptype)
{
struct nf_conntrack_tuple curr_tuple, new_tuple;
struct nf_conn_nat *nat;
int have_to_hash = !(ct->status & IPS_NAT_DONE_MASK);
- enum nf_nat_manip_type maniptype = HOOK2MANIP(hooknum);
/* nat helper or nfctnetlink also setup binding */
nat = nfct_nat(ct);
}
}
- NF_CT_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
- hooknum == NF_IP_POST_ROUTING ||
- hooknum == NF_IP_LOCAL_IN ||
- hooknum == NF_IP_LOCAL_OUT);
+ NF_CT_ASSERT(maniptype == IP_NAT_MANIP_SRC ||
+ maniptype == IP_NAT_MANIP_DST);
BUG_ON(nf_nat_initialized(ct, maniptype));
/* What we've got will look like inverse of reply. Normally
unsigned int srchash;
srchash = hash_by_src(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
- write_lock_bh(&nf_nat_lock);
+ spin_lock_bh(&nf_nat_lock);
/* nf_conntrack_alter_reply might re-allocate exntension aera */
nat = nfct_nat(ct);
nat->ct = ct;
- hlist_add_head(&nat->bysource, &bysource[srchash]);
- write_unlock_bh(&nf_nat_lock);
+ hlist_add_head_rcu(&nat->bysource, &bysource[srchash]);
+ spin_unlock_bh(&nf_nat_lock);
}
/* It's done. */
enum nf_nat_manip_type maniptype)
{
struct iphdr *iph;
- struct nf_nat_protocol *p;
+ const struct nf_nat_protocol *p;
if (!skb_make_writable(skb, iphdroff + sizeof(*iph)))
return 0;
iph = (void *)skb->data + iphdroff;
if (maniptype == IP_NAT_MANIP_SRC) {
- nf_csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
+ csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
iph->saddr = target->src.u3.ip;
} else {
- nf_csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip);
+ csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip);
iph->daddr = target->dst.u3.ip;
}
return 1;
EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
/* Protocol registration. */
-int nf_nat_protocol_register(struct nf_nat_protocol *proto)
+int nf_nat_protocol_register(const struct nf_nat_protocol *proto)
{
int ret = 0;
- write_lock_bh(&nf_nat_lock);
+ spin_lock_bh(&nf_nat_lock);
if (nf_nat_protos[proto->protonum] != &nf_nat_unknown_protocol) {
ret = -EBUSY;
goto out;
}
rcu_assign_pointer(nf_nat_protos[proto->protonum], proto);
out:
- write_unlock_bh(&nf_nat_lock);
+ spin_unlock_bh(&nf_nat_lock);
return ret;
}
EXPORT_SYMBOL(nf_nat_protocol_register);
/* Noone stores the protocol anywhere; simply delete it. */
-void nf_nat_protocol_unregister(struct nf_nat_protocol *proto)
+void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto)
{
- write_lock_bh(&nf_nat_lock);
+ spin_lock_bh(&nf_nat_lock);
rcu_assign_pointer(nf_nat_protos[proto->protonum],
&nf_nat_unknown_protocol);
- write_unlock_bh(&nf_nat_lock);
+ spin_unlock_bh(&nf_nat_lock);
synchronize_rcu();
}
EXPORT_SYMBOL(nf_nat_protocol_unregister);
nf_nat_port_range_to_nlattr(struct sk_buff *skb,
const struct nf_nat_range *range)
{
- NLA_PUT(skb, CTA_PROTONAT_PORT_MIN, sizeof(__be16),
- &range->min.tcp.port);
- NLA_PUT(skb, CTA_PROTONAT_PORT_MAX, sizeof(__be16),
- &range->max.tcp.port);
+ NLA_PUT_BE16(skb, CTA_PROTONAT_PORT_MIN, range->min.tcp.port);
+ NLA_PUT_BE16(skb, CTA_PROTONAT_PORT_MAX, range->max.tcp.port);
return 0;
if (tb[CTA_PROTONAT_PORT_MIN]) {
ret = 1;
- range->min.tcp.port =
- *(__be16 *)nla_data(tb[CTA_PROTONAT_PORT_MIN]);
+ range->min.tcp.port = nla_get_be16(tb[CTA_PROTONAT_PORT_MIN]);
}
if (!tb[CTA_PROTONAT_PORT_MAX]) {
range->max.tcp.port = range->min.tcp.port;
} else {
ret = 1;
- range->max.tcp.port =
- *(__be16 *)nla_data(tb[CTA_PROTONAT_PORT_MAX]);
+ range->max.tcp.port = nla_get_be16(tb[CTA_PROTONAT_PORT_MAX]);
}
return ret;
NF_CT_ASSERT(nat->ct->status & IPS_NAT_DONE_MASK);
- write_lock_bh(&nf_nat_lock);
- hlist_del(&nat->bysource);
+ spin_lock_bh(&nf_nat_lock);
+ hlist_del_rcu(&nat->bysource);
nat->ct = NULL;
- write_unlock_bh(&nf_nat_lock);
+ spin_unlock_bh(&nf_nat_lock);
}
-static void nf_nat_move_storage(struct nf_conn *conntrack, void *old)
+static void nf_nat_move_storage(void *new, void *old)
{
- struct nf_conn_nat *new_nat = nf_ct_ext_find(conntrack, NF_CT_EXT_NAT);
- struct nf_conn_nat *old_nat = (struct nf_conn_nat *)old;
+ struct nf_conn_nat *new_nat = new;
+ struct nf_conn_nat *old_nat = old;
struct nf_conn *ct = old_nat->ct;
if (!ct || !(ct->status & IPS_NAT_DONE_MASK))
return;
- write_lock_bh(&nf_nat_lock);
+ spin_lock_bh(&nf_nat_lock);
hlist_replace_rcu(&old_nat->bysource, &new_nat->bysource);
new_nat->ct = ct;
- write_unlock_bh(&nf_nat_lock);
+ spin_unlock_bh(&nf_nat_lock);
}
static struct nf_ct_ext_type nat_extend __read_mostly = {
}
/* Sew in builtin protocols. */
- write_lock_bh(&nf_nat_lock);
+ spin_lock_bh(&nf_nat_lock);
for (i = 0; i < MAX_IP_NAT_PROTO; i++)
rcu_assign_pointer(nf_nat_protos[i], &nf_nat_unknown_protocol);
rcu_assign_pointer(nf_nat_protos[IPPROTO_TCP], &nf_nat_protocol_tcp);
rcu_assign_pointer(nf_nat_protos[IPPROTO_UDP], &nf_nat_protocol_udp);
rcu_assign_pointer(nf_nat_protos[IPPROTO_ICMP], &nf_nat_protocol_icmp);
- write_unlock_bh(&nf_nat_lock);
-
- for (i = 0; i < nf_nat_htable_size; i++) {
- INIT_HLIST_HEAD(&bysource[i]);
- }
+ spin_unlock_bh(&nf_nat_lock);
/* Initialize fake conntrack so that NAT will skip it */
nf_conntrack_untracked.status |= IPS_NAT_DONE_MASK;
projects / linux-flexiantxendom0-3.2.10.git / blobdiff