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netfilter: conntrack: remove invert_tuple indirection from l3 protocol trackers

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Its simpler to just handle it directly in nf_ct_invert_tuple().
Also gets rid of need to pass l3proto pointer to resolve_conntrack().

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-06-29 07:46:46 +02:00 committed by Pablo Neira Ayuso
parent 47a91b14de
commit d1b6fe9494
8 changed files with 18 additions and 52 deletions
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1
include/net/netfilter/nf_conntrack_core.h
View File

@ -42,7 +42,6 @@ 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_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto);
/* Find a connection corresponding to a tuple. */

7
include/net/netfilter/nf_conntrack_l3proto.h
View File

@ -24,13 +24,6 @@ struct nf_conntrack_l3proto {
/* size of tuple nlattr, fills a hole */
u16 nla_size;
/*
* Invert the per-proto part of the tuple: ie. turn xmit into reply.
* Some packets can't be inverted: return 0 in that case.
*/
bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig);
/*
* Called before tracking.
* *dataoff: offset of protocol header (TCP, UDP,...) in skb

10
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
View File

@ -38,15 +38,6 @@ struct conntrack4_net {
unsigned int users;
};
static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig)
{
tuple->src.u3.ip = orig->dst.u3.ip;
tuple->dst.u3.ip = orig->src.u3.ip;
return true;
}
static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
unsigned int *dataoff, u_int8_t *protonum)
{
@ -306,7 +297,6 @@ static void ipv4_hooks_unregister(struct net *net)
const struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 = {
.l3proto = PF_INET,
.invert_tuple = ipv4_invert_tuple,
.get_l4proto = ipv4_get_l4proto,
.net_ns_get = ipv4_hooks_register,
.net_ns_put = ipv4_hooks_unregister,

3
net/ipv4/netfilter/nf_conntrack_proto_icmp.c
View File

@ -142,8 +142,7 @@ icmp_error_message(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
/* Ordinarily, we'd expect the inverted tupleproto, but it's
been preserved inside the ICMP. */
if (!nf_ct_invert_tuple(&innertuple, &origtuple,
&nf_conntrack_l3proto_ipv4, innerproto)) {
if (!nf_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
pr_debug("icmp_error_message: no match\n");
return -NF_ACCEPT;
}

10
net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
View File

@ -41,15 +41,6 @@ struct conntrack6_net {
unsigned int users;
};
static bool ipv6_invert_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig)
{
memcpy(tuple->src.u3.ip6, orig->dst.u3.ip6, sizeof(tuple->src.u3.ip6));
memcpy(tuple->dst.u3.ip6, orig->src.u3.ip6, sizeof(tuple->dst.u3.ip6));
return true;
}
static int ipv6_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
unsigned int *dataoff, u_int8_t *protonum)
{
@ -290,7 +281,6 @@ static void ipv6_hooks_unregister(struct net *net)
const struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 = {
.l3proto = PF_INET6,
.invert_tuple = ipv6_invert_tuple,
.get_l4proto = ipv6_get_l4proto,
.net_ns_get = ipv6_hooks_register,
.net_ns_put = ipv6_hooks_unregister,

3
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
View File

@ -152,8 +152,7 @@ icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
/* Ordinarily, we'd expect the inverted tupleproto, but it's
been preserved inside the ICMP. */
if (!nf_ct_invert_tuple(&intuple, &origtuple,
&nf_conntrack_l3proto_ipv6, inproto)) {
if (!nf_ct_invert_tuple(&intuple, &origtuple, inproto)) {
pr_debug("icmpv6_error: Can't invert tuple\n");
return -NF_ACCEPT;
}

26
net/netfilter/nf_conntrack_core.c
View File

@ -305,14 +305,24 @@ 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_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto)
{
memset(inverse, 0, sizeof(*inverse));
inverse->src.l3num = orig->src.l3num;
if (l3proto->invert_tuple(inverse, orig) == 0)
return false;
switch (orig->src.l3num) {
case NFPROTO_IPV4:
inverse->src.u3.ip = orig->dst.u3.ip;
inverse->dst.u3.ip = orig->src.u3.ip;
break;
case NFPROTO_IPV6:
inverse->src.u3.in6 = orig->dst.u3.in6;
inverse->dst.u3.in6 = orig->src.u3.in6;
break;
default:
break;
}
inverse->dst.dir = !orig->dst.dir;
@ -1222,7 +1232,6 @@ 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_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto,
struct sk_buff *skb,
unsigned int dataoff, u32 hash)
@ -1237,7 +1246,7 @@ init_conntrack(struct net *net, struct nf_conn *tmpl,
struct nf_conntrack_zone tmp;
unsigned int *timeouts;
if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) {
if (!nf_ct_invert_tuple(&repl_tuple, tuple, l4proto)) {
pr_debug("Can't invert tuple.\n");
return NULL;
}
@ -1334,7 +1343,6 @@ resolve_normal_ct(struct net *net, struct nf_conn *tmpl,
unsigned int dataoff,
u_int16_t l3num,
u_int8_t protonum,
const struct nf_conntrack_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto)
{
const struct nf_conntrack_zone *zone;
@ -1356,7 +1364,7 @@ resolve_normal_ct(struct net *net, struct nf_conn *tmpl,
hash = hash_conntrack_raw(&tuple, net);
h = __nf_conntrack_find_get(net, zone, &tuple, hash);
if (!h) {
h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto,
h = init_conntrack(net, tmpl, &tuple, l4proto,
skb, dataoff, hash);
if (!h)
return 0;
@ -1439,8 +1447,7 @@ nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
goto out;
}
repeat:
ret = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum,
l3proto, l4proto);
ret = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, l4proto);
if (ret < 0) {
/* Too stressed to deal. */
NF_CT_STAT_INC_ATOMIC(net, drop);
@ -1497,7 +1504,6 @@ bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
rcu_read_lock();
ret = nf_ct_invert_tuple(inverse, orig,
__nf_ct_l3proto_find(orig->src.l3num),
__nf_ct_l4proto_find(orig->src.l3num,
orig->dst.protonum));
rcu_read_unlock();

10
net/netfilter/nf_conntrack_l3proto_generic.c
View File

@ -31,15 +31,6 @@
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig)
{
memset(&tuple->src.u3, 0, sizeof(tuple->src.u3));
memset(&tuple->dst.u3, 0, sizeof(tuple->dst.u3));
return true;
}
static int generic_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
unsigned int *dataoff, u_int8_t *protonum)
{
@ -50,7 +41,6 @@ static int generic_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
struct nf_conntrack_l3proto nf_conntrack_l3proto_generic __read_mostly = {
.l3proto = PF_UNSPEC,
.invert_tuple = generic_invert_tuple,
.get_l4proto = generic_get_l4proto,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_generic);