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netfilter: netns nat: per-netns bysource hash 

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Alexey Dobriyan 2008-10-08 11:35:11 +02:00 committed by Patrick McHardy
parent e099a17357
commit 0c4c9288ad
2 changed files with 47 additions and 27 deletions
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2
include/net/netns/ipv4.h
View File

@ -39,6 +39,8 @@ struct netns_ipv4 {
struct xt_table *arptable_filter;
struct xt_table *iptable_security;
struct xt_table *nat_table;
struct hlist_head *nat_bysource;
int nat_vmalloced;
#endif
int sysctl_icmp_echo_ignore_all;

72
net/ipv4/netfilter/nf_nat_core.c
View File

@ -37,9 +37,6 @@ static struct nf_conntrack_l3proto *l3proto __read_mostly;
/* Calculated at init based on memory size */
static unsigned int nf_nat_htable_size __read_mostly;
static int nf_nat_vmalloced;
static struct hlist_head *bysource __read_mostly;
#define MAX_IP_NAT_PROTO 256
static const struct nf_nat_protocol *nf_nat_protos[MAX_IP_NAT_PROTO]
@ -145,7 +142,8 @@ same_src(const struct nf_conn *ct,
/* Only called for SRC manip */
static int
find_appropriate_src(const struct nf_conntrack_tuple *tuple,
find_appropriate_src(struct net *net,
const struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *result,
const struct nf_nat_range *range)
{
@ -155,7 +153,7 @@ find_appropriate_src(const struct nf_conntrack_tuple *tuple,
const struct hlist_node *n;
rcu_read_lock();
hlist_for_each_entry_rcu(nat, n, &bysource[h], bysource) {
hlist_for_each_entry_rcu(nat, n, &net->ipv4.nat_bysource[h], bysource) {
ct = nat->ct;
if (same_src(ct, tuple)) {
/* Copy source part from reply tuple. */
@ -231,6 +229,7 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
struct nf_conn *ct,
enum nf_nat_manip_type maniptype)
{
struct net *net = nf_ct_net(ct);
const struct nf_nat_protocol *proto;
/* 1) If this srcip/proto/src-proto-part is currently mapped,
@ -242,7 +241,7 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
manips not an issue. */
if (maniptype == IP_NAT_MANIP_SRC &&
!(range->flags & IP_NAT_RANGE_PROTO_RANDOM)) {
if (find_appropriate_src(orig_tuple, tuple, range)) {
if (find_appropriate_src(net, orig_tuple, tuple, range)) {
pr_debug("get_unique_tuple: Found current src map\n");
if (!nf_nat_used_tuple(tuple, ct))
return;
@ -283,6 +282,7 @@ nf_nat_setup_info(struct nf_conn *ct,
const struct nf_nat_range *range,
enum nf_nat_manip_type maniptype)
{
struct net *net = nf_ct_net(ct);
struct nf_conntrack_tuple curr_tuple, new_tuple;
struct nf_conn_nat *nat;
int have_to_hash = !(ct->status & IPS_NAT_DONE_MASK);
@ -334,7 +334,8 @@ nf_nat_setup_info(struct nf_conn *ct,
/* nf_conntrack_alter_reply might re-allocate exntension aera */
nat = nfct_nat(ct);
nat->ct = ct;
hlist_add_head_rcu(&nat->bysource, &bysource[srchash]);
hlist_add_head_rcu(&nat->bysource,
&net->ipv4.nat_bysource[srchash]);
spin_unlock_bh(&nf_nat_lock);
}
@ -583,6 +584,40 @@ static struct nf_ct_ext_type nat_extend __read_mostly = {
.flags = NF_CT_EXT_F_PREALLOC,
};
static int __net_init nf_nat_net_init(struct net *net)
{
net->ipv4.nat_bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size,
&net->ipv4.nat_vmalloced);
if (!net->ipv4.nat_bysource)
return -ENOMEM;
return 0;
}
/* Clear NAT section of all conntracks, in case we're loaded again. */
static int clean_nat(struct nf_conn *i, void *data)
{
struct nf_conn_nat *nat = nfct_nat(i);
if (!nat)
return 0;
memset(nat, 0, sizeof(*nat));
i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
return 0;
}
static void __net_exit nf_nat_net_exit(struct net *net)
{
nf_ct_iterate_cleanup(net, &clean_nat, NULL);
synchronize_rcu();
nf_ct_free_hashtable(net->ipv4.nat_bysource, net->ipv4.nat_vmalloced,
nf_nat_htable_size);
}
static struct pernet_operations nf_nat_net_ops = {
.init = nf_nat_net_init,
.exit = nf_nat_net_exit,
};
static int __init nf_nat_init(void)
{
size_t i;
@ -599,12 +634,9 @@ static int __init nf_nat_init(void)
/* Leave them the same for the moment. */
nf_nat_htable_size = nf_conntrack_htable_size;
bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size,
&nf_nat_vmalloced);
if (!bysource) {
ret = -ENOMEM;
ret = register_pernet_subsys(&nf_nat_net_ops);
if (ret < 0)
goto cleanup_extend;
}
/* Sew in builtin protocols. */
spin_lock_bh(&nf_nat_lock);
@ -629,23 +661,9 @@ static int __init nf_nat_init(void)
return ret;
}
/* Clear NAT section of all conntracks, in case we're loaded again. */
static int clean_nat(struct nf_conn *i, void *data)
{
struct nf_conn_nat *nat = nfct_nat(i);
if (!nat)
return 0;
memset(nat, 0, sizeof(*nat));
i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
return 0;
}
static void __exit nf_nat_cleanup(void)
{
nf_ct_iterate_cleanup(&init_net, &clean_nat, NULL);
synchronize_rcu();
nf_ct_free_hashtable(bysource, nf_nat_vmalloced, nf_nat_htable_size);
unregister_pernet_subsys(&nf_nat_net_ops);
nf_ct_l3proto_put(l3proto);
nf_ct_extend_unregister(&nat_extend);
rcu_assign_pointer(nf_nat_seq_adjust_hook, NULL);