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netfilter: conntrack: avoid unneeded nf_conntrack_l4proto lookups 

after removal of the packet and invert function pointers, several
places do not need to lookup the l4proto structure anymore.

Remove those lookups.
The function nf_ct_invert_tuplepr becomes redundant, replace
it with nf_ct_invert_tuple everywhere.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2019-01-15 22:03:42 +01:00 committed by Pablo Neira Ayuso
parent edf0338dab
commit 303e0c5589
10 changed files with 22 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/netfilter/nf_conntrack.h
View File

@ -187,8 +187,6 @@ bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
u_int16_t l3num, struct net *net,
struct nf_conntrack_tuple *tuple);
bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig);
void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
const struct sk_buff *skb,

3
include/net/netfilter/nf_conntrack_core.h
View File

@ -39,8 +39,7 @@ void nf_conntrack_init_end(void);
void nf_conntrack_cleanup_end(void);
bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_l4proto *l4proto);
const struct nf_conntrack_tuple *orig);
/* Find a connection corresponding to a tuple. */
struct nf_conntrack_tuple_hash *

2
net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
View File

@ -214,7 +214,7 @@ int nf_nat_icmp_reply_translation(struct sk_buff *skb,
}
/* Change outer to look like the reply to an incoming packet */
nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
if (!nf_nat_ipv4_manip_pkt(skb, 0, &target, manip))
return 0;

2
net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
View File

@ -225,7 +225,7 @@ int nf_nat_icmpv6_reply_translation(struct sk_buff *skb,
skb->len - hdrlen, 0));
}
nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
if (!nf_nat_ipv6_manip_pkt(skb, 0, &target, manip))
return 0;

53
net/netfilter/nf_conntrack_core.c
View File

@ -229,8 +229,7 @@ nf_ct_get_tuple(const struct sk_buff *skb,
u_int16_t l3num,
u_int8_t protonum,
struct net *net,
struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l4proto *l4proto)
struct nf_conntrack_tuple *tuple)
{
unsigned int size;
const __be32 *ap;
@ -374,33 +373,20 @@ bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
u_int16_t l3num,
struct net *net, struct nf_conntrack_tuple *tuple)
{
const struct nf_conntrack_l4proto *l4proto;
u8 protonum;
int protoff;
int ret;
rcu_read_lock();
protoff = get_l4proto(skb, nhoff, l3num, &protonum);
if (protoff <= 0) {
rcu_read_unlock();
if (protoff <= 0)
return false;
}
l4proto = __nf_ct_l4proto_find(protonum);
ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, net, tuple,
l4proto);
rcu_read_unlock();
return ret;
return nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, net, tuple);
}
EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr);
bool
nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_l4proto *l4proto)
const struct nf_conntrack_tuple *orig)
{
memset(inverse, 0, sizeof(*inverse));
@ -1354,7 +1340,6 @@ EXPORT_SYMBOL_GPL(nf_conntrack_free);
static noinline struct nf_conntrack_tuple_hash *
init_conntrack(struct net *net, struct nf_conn *tmpl,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l4proto *l4proto,
struct sk_buff *skb,
unsigned int dataoff, u32 hash)
{
@ -1367,7 +1352,7 @@ init_conntrack(struct net *net, struct nf_conn *tmpl,
struct nf_conn_timeout *timeout_ext;
struct nf_conntrack_zone tmp;
if (!nf_ct_invert_tuple(&repl_tuple, tuple, l4proto)) {
if (!nf_ct_invert_tuple(&repl_tuple, tuple)) {
pr_debug("Can't invert tuple.\n");
return NULL;
}
@ -1449,7 +1434,6 @@ resolve_normal_ct(struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
u_int8_t protonum,
const struct nf_conntrack_l4proto *l4proto,
const struct nf_hook_state *state)
{
const struct nf_conntrack_zone *zone;
@ -1462,7 +1446,7 @@ resolve_normal_ct(struct nf_conn *tmpl,
if (!nf_ct_get_tuple(skb, skb_network_offset(skb),
dataoff, state->pf, protonum, state->net,
&tuple, l4proto)) {
&tuple)) {
pr_debug("Can't get tuple\n");
return 0;
}
@ -1472,7 +1456,7 @@ resolve_normal_ct(struct nf_conn *tmpl,
hash = hash_conntrack_raw(&tuple, state->net);
h = __nf_conntrack_find_get(state->net, zone, &tuple, hash);
if (!h) {
h = init_conntrack(state->net, tmpl, &tuple, l4proto,
h = init_conntrack(state->net, tmpl, &tuple,
skb, dataoff, hash);
if (!h)
return 0;
@ -1592,7 +1576,6 @@ static int nf_conntrack_handle_packet(struct nf_conn *ct,
unsigned int
nf_conntrack_in(struct sk_buff *skb, const struct nf_hook_state *state)
{
const struct nf_conntrack_l4proto *l4proto;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct, *tmpl;
u_int8_t protonum;
@ -1619,8 +1602,6 @@ nf_conntrack_in(struct sk_buff *skb, const struct nf_hook_state *state)
goto out;
}
l4proto = __nf_ct_l4proto_find(protonum);
if (protonum == IPPROTO_ICMP || protonum == IPPROTO_ICMPV6) {
ret = nf_conntrack_handle_icmp(tmpl, skb, dataoff,
protonum, state);
@ -1634,7 +1615,7 @@ nf_conntrack_in(struct sk_buff *skb, const struct nf_hook_state *state)
}
repeat:
ret = resolve_normal_ct(tmpl, skb, dataoff,
protonum, l4proto, state);
protonum, state);
if (ret < 0) {
/* Too stressed to deal. */
NF_CT_STAT_INC_ATOMIC(state->net, drop);
@ -1681,19 +1662,6 @@ out:
}
EXPORT_SYMBOL_GPL(nf_conntrack_in);
bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig)
{
bool ret;
rcu_read_lock();
ret = nf_ct_invert_tuple(inverse, orig,
__nf_ct_l4proto_find(orig->dst.protonum));
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr);
/* Alter reply tuple (maybe alter helper). This is for NAT, and is
implicitly racy: see __nf_conntrack_confirm */
void nf_conntrack_alter_reply(struct nf_conn *ct,
@ -1824,7 +1792,6 @@ static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb)
static int nf_conntrack_update(struct net *net, struct sk_buff *skb)
{
const struct nf_conntrack_l4proto *l4proto;
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_tuple tuple;
enum ip_conntrack_info ctinfo;
@ -1845,10 +1812,8 @@ static int nf_conntrack_update(struct net *net, struct sk_buff *skb)
if (dataoff <= 0)
return -1;
l4proto = nf_ct_l4proto_find_get(l4num);
if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num,
l4num, net, &tuple, l4proto))
l4num, net, &tuple))
return -1;
if (ct->status & IPS_SRC_NAT) {

2
net/netfilter/nf_conntrack_pptp.c
View File

@ -121,7 +121,7 @@ static void pptp_expectfn(struct nf_conn *ct,
struct nf_conntrack_expect *exp_other;
/* obviously this tuple inversion only works until you do NAT */
nf_ct_invert_tuplepr(&inv_t, &exp->tuple);
nf_ct_invert_tuple(&inv_t, &exp->tuple);
pr_debug("trying to unexpect other dir: ");
nf_ct_dump_tuple(&inv_t);

6
net/netfilter/nf_conntrack_proto_icmp.c
View File

@ -109,7 +109,6 @@ icmp_error_message(struct nf_conn *tmpl, struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nf_conntrack_tuple innertuple, origtuple;
const struct nf_conntrack_l4proto *innerproto;
const struct nf_conntrack_tuple_hash *h;
const struct nf_conntrack_zone *zone;
enum ip_conntrack_info ctinfo;
@ -127,12 +126,9 @@ icmp_error_message(struct nf_conn *tmpl, struct sk_buff *skb,
return -NF_ACCEPT;
}
/* rcu_read_lock()ed by nf_hook_thresh */
innerproto = __nf_ct_l4proto_find(origtuple.dst.protonum);
/* Ordinarily, we'd expect the inverted tupleproto, but it's
been preserved inside the ICMP. */
if (!nf_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
if (!nf_ct_invert_tuple(&innertuple, &origtuple)) {
pr_debug("icmp_error_message: no match\n");
return -NF_ACCEPT;
}

6
net/netfilter/nf_conntrack_proto_icmpv6.c
View File

@ -130,7 +130,6 @@ icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
{
struct nf_conntrack_tuple intuple, origtuple;
const struct nf_conntrack_tuple_hash *h;
const struct nf_conntrack_l4proto *inproto;
enum ip_conntrack_info ctinfo;
struct nf_conntrack_zone tmp;
@ -146,12 +145,9 @@ icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
return -NF_ACCEPT;
}
/* rcu_read_lock()ed by nf_hook_thresh */
inproto = __nf_ct_l4proto_find(origtuple.dst.protonum);
/* Ordinarily, we'd expect the inverted tupleproto, but it's
been preserved inside the ICMP. */
if (!nf_ct_invert_tuple(&intuple, &origtuple, inproto)) {
if (!nf_ct_invert_tuple(&intuple, &origtuple)) {
pr_debug("icmpv6_error: Can't invert tuple\n");
return -NF_ACCEPT;
}

12
net/netfilter/nf_nat_core.c
View File

@ -158,7 +158,7 @@ nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
*/
struct nf_conntrack_tuple reply;
nf_ct_invert_tuplepr(&reply, tuple);
nf_ct_invert_tuple(&reply, tuple);
return nf_conntrack_tuple_taken(&reply, ignored_conntrack);
}
EXPORT_SYMBOL(nf_nat_used_tuple);
@ -253,7 +253,7 @@ find_appropriate_src(struct net *net,
net_eq(net, nf_ct_net(ct)) &&
nf_ct_zone_equal(ct, zone, IP_CT_DIR_ORIGINAL)) {
/* Copy source part from reply tuple. */
nf_ct_invert_tuplepr(result,
nf_ct_invert_tuple(result,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
result->dst = tuple->dst;
@ -560,8 +560,8 @@ nf_nat_setup_info(struct nf_conn *ct,
* manipulations (future optimization: if num_manips == 0,
* orig_tp = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
*/
nf_ct_invert_tuplepr(&curr_tuple,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
nf_ct_invert_tuple(&curr_tuple,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
get_unique_tuple(&new_tuple, &curr_tuple, range, ct, maniptype);
@ -569,7 +569,7 @@ nf_nat_setup_info(struct nf_conn *ct,
struct nf_conntrack_tuple reply;
/* Alter conntrack table so will recognize replies. */
nf_ct_invert_tuplepr(&reply, &new_tuple);
nf_ct_invert_tuple(&reply, &new_tuple);
nf_conntrack_alter_reply(ct, &reply);
/* Non-atomic: we own this at the moment. */
@ -640,7 +640,7 @@ static unsigned int nf_nat_manip_pkt(struct sk_buff *skb, struct nf_conn *ct,
struct nf_conntrack_tuple target;
/* We are aiming to look like inverse of other direction. */
nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
l3proto = __nf_nat_l3proto_find(target.src.l3num);
if (!l3proto->manip_pkt(skb, 0, &target, mtype))

2
net/openvswitch/conntrack.c
View File

@ -622,7 +622,7 @@ ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
if (natted) {
struct nf_conntrack_tuple inverse;
if (!nf_ct_invert_tuplepr(&inverse, &tuple)) {
if (!nf_ct_invert_tuple(&inverse, &tuple)) {
pr_debug("ovs_ct_find_existing: Inversion failed!\n");
return NULL;
}