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Message-Id: <20181221002841.28587-17-pablo@netfilter.org>
Date: Fri, 21 Dec 2018 01:28:20 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 16/37] netfilter: nat: un-export nf_nat_l4proto_unique_tuple
From: Florian Westphal <fw@...len.de>
almost all l4proto->unique_tuple implementations just call this helper,
so make ->unique_tuple() optional and call its helper directly if the
l4proto doesn't override it.
This is an intermediate step to get rid of ->unique_tuple completely.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_nat_l4proto.h | 6 ---
net/netfilter/nf_nat_core.c | 76 +++++++++++++++++++++++++++++++++-
net/netfilter/nf_nat_proto_common.c | 73 --------------------------------
net/netfilter/nf_nat_proto_dccp.c | 11 -----
net/netfilter/nf_nat_proto_sctp.c | 11 -----
net/netfilter/nf_nat_proto_tcp.c | 11 -----
net/netfilter/nf_nat_proto_udp.c | 22 ----------
7 files changed, 75 insertions(+), 135 deletions(-)
diff --git a/include/net/netfilter/nf_nat_l4proto.h b/include/net/netfilter/nf_nat_l4proto.h
index 7ecac2cd1020..96f0794bb1f8 100644
--- a/include/net/netfilter/nf_nat_l4proto.h
+++ b/include/net/netfilter/nf_nat_l4proto.h
@@ -70,12 +70,6 @@ bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
const union nf_conntrack_man_proto *min,
const union nf_conntrack_man_proto *max);
-void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
- struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range2 *range,
- enum nf_nat_manip_type maniptype,
- const struct nf_conn *ct);
-
int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
struct nf_nat_range2 *range);
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index e2b196054dfc..0c0f012343b1 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -310,6 +310,77 @@ find_best_ips_proto(const struct nf_conntrack_zone *zone,
}
}
+static void nf_nat_l4proto_unique_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range2 *range,
+ enum nf_nat_manip_type maniptype,
+ const struct nf_conn *ct)
+{
+ unsigned int range_size, min, max, i, attempts;
+ __be16 *portptr;
+ u16 off;
+ static const unsigned int max_attempts = 128;
+
+ if (maniptype == NF_NAT_MANIP_SRC)
+ portptr = &tuple->src.u.all;
+ else
+ portptr = &tuple->dst.u.all;
+
+ /* If no range specified... */
+ if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)) {
+ /* If it's dst rewrite, can't change port */
+ if (maniptype == NF_NAT_MANIP_DST)
+ return;
+
+ if (ntohs(*portptr) < 1024) {
+ /* Loose convention: >> 512 is credential passing */
+ if (ntohs(*portptr) < 512) {
+ min = 1;
+ range_size = 511 - min + 1;
+ } else {
+ min = 600;
+ range_size = 1023 - min + 1;
+ }
+ } else {
+ min = 1024;
+ range_size = 65535 - 1024 + 1;
+ }
+ } else {
+ min = ntohs(range->min_proto.all);
+ max = ntohs(range->max_proto.all);
+ if (unlikely(max < min))
+ swap(max, min);
+ range_size = max - min + 1;
+ }
+
+ if (range->flags & NF_NAT_RANGE_PROTO_OFFSET)
+ off = (ntohs(*portptr) - ntohs(range->base_proto.all));
+ else
+ off = prandom_u32();
+
+ attempts = range_size;
+ if (attempts > max_attempts)
+ attempts = max_attempts;
+
+ /* We are in softirq; doing a search of the entire range risks
+ * soft lockup when all tuples are already used.
+ *
+ * If we can't find any free port from first offset, pick a new
+ * one and try again, with ever smaller search window.
+ */
+another_round:
+ for (i = 0; i < attempts; i++, off++) {
+ *portptr = htons(min + off % range_size);
+ if (!nf_nat_used_tuple(tuple, ct))
+ return;
+ }
+
+ if (attempts >= range_size || attempts < 16)
+ return;
+ attempts /= 2;
+ off = prandom_u32();
+ goto another_round;
+}
+
/* 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
@@ -383,7 +454,10 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
}
/* Last chance: get protocol to try to obtain unique tuple. */
- l4proto->unique_tuple(l3proto, tuple, range, maniptype, ct);
+ if (l4proto->unique_tuple)
+ l4proto->unique_tuple(l3proto, tuple, range, maniptype, ct);
+ else
+ nf_nat_l4proto_unique_tuple(tuple, range, maniptype, ct);
out:
rcu_read_unlock();
}
diff --git a/net/netfilter/nf_nat_proto_common.c b/net/netfilter/nf_nat_proto_common.c
index dabfe9a2c041..ef14d86f0f5b 100644
--- a/net/netfilter/nf_nat_proto_common.c
+++ b/net/netfilter/nf_nat_proto_common.c
@@ -34,79 +34,6 @@ bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
}
EXPORT_SYMBOL_GPL(nf_nat_l4proto_in_range);
-void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
- struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range2 *range,
- enum nf_nat_manip_type maniptype,
- const struct nf_conn *ct)
-{
- unsigned int range_size, min, max, i, attempts;
- __be16 *portptr;
- u16 off;
- static const unsigned int max_attempts = 128;
-
- if (maniptype == NF_NAT_MANIP_SRC)
- portptr = &tuple->src.u.all;
- else
- portptr = &tuple->dst.u.all;
-
- /* If no range specified... */
- if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)) {
- /* If it's dst rewrite, can't change port */
- if (maniptype == NF_NAT_MANIP_DST)
- return;
-
- if (ntohs(*portptr) < 1024) {
- /* Loose convention: >> 512 is credential passing */
- if (ntohs(*portptr) < 512) {
- min = 1;
- range_size = 511 - min + 1;
- } else {
- min = 600;
- range_size = 1023 - min + 1;
- }
- } else {
- min = 1024;
- range_size = 65535 - 1024 + 1;
- }
- } else {
- min = ntohs(range->min_proto.all);
- max = ntohs(range->max_proto.all);
- if (unlikely(max < min))
- swap(max, min);
- range_size = max - min + 1;
- }
-
- if (range->flags & NF_NAT_RANGE_PROTO_OFFSET)
- off = (ntohs(*portptr) - ntohs(range->base_proto.all));
- else
- off = prandom_u32();
-
- attempts = range_size;
- if (attempts > max_attempts)
- attempts = max_attempts;
-
- /* We are in softirq; doing a search of the entire range risks
- * soft lockup when all tuples are already used.
- *
- * If we can't find any free port from first offset, pick a new
- * one and try again, with ever smaller search window.
- */
-another_round:
- for (i = 0; i < attempts; i++, off++) {
- *portptr = htons(min + off % range_size);
- if (!nf_nat_used_tuple(tuple, ct))
- return;
- }
-
- if (attempts >= range_size || attempts < 16)
- return;
- attempts /= 2;
- off = prandom_u32();
- goto another_round;
-}
-EXPORT_SYMBOL_GPL(nf_nat_l4proto_unique_tuple);
-
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
struct nf_nat_range2 *range)
diff --git a/net/netfilter/nf_nat_proto_dccp.c b/net/netfilter/nf_nat_proto_dccp.c
index 7d4d2c124990..8dbba7b20177 100644
--- a/net/netfilter/nf_nat_proto_dccp.c
+++ b/net/netfilter/nf_nat_proto_dccp.c
@@ -18,16 +18,6 @@
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
-static void
-dccp_unique_tuple(const struct nf_nat_l3proto *l3proto,
- struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range2 *range,
- enum nf_nat_manip_type maniptype,
- const struct nf_conn *ct)
-{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
-}
-
static bool
dccp_manip_pkt(struct sk_buff *skb,
const struct nf_nat_l3proto *l3proto,
@@ -72,7 +62,6 @@ const struct nf_nat_l4proto nf_nat_l4proto_dccp = {
.l4proto = IPPROTO_DCCP,
.manip_pkt = dccp_manip_pkt,
.in_range = nf_nat_l4proto_in_range,
- .unique_tuple = dccp_unique_tuple,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
diff --git a/net/netfilter/nf_nat_proto_sctp.c b/net/netfilter/nf_nat_proto_sctp.c
index f05ad8fa7b20..da86475d0db6 100644
--- a/net/netfilter/nf_nat_proto_sctp.c
+++ b/net/netfilter/nf_nat_proto_sctp.c
@@ -12,16 +12,6 @@
#include <net/netfilter/nf_nat_l4proto.h>
-static void
-sctp_unique_tuple(const struct nf_nat_l3proto *l3proto,
- struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range2 *range,
- enum nf_nat_manip_type maniptype,
- const struct nf_conn *ct)
-{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
-}
-
static bool
sctp_manip_pkt(struct sk_buff *skb,
const struct nf_nat_l3proto *l3proto,
@@ -67,7 +57,6 @@ const struct nf_nat_l4proto nf_nat_l4proto_sctp = {
.l4proto = IPPROTO_SCTP,
.manip_pkt = sctp_manip_pkt,
.in_range = nf_nat_l4proto_in_range,
- .unique_tuple = sctp_unique_tuple,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
diff --git a/net/netfilter/nf_nat_proto_tcp.c b/net/netfilter/nf_nat_proto_tcp.c
index c312e6b3e2ea..666a4b3303f7 100644
--- a/net/netfilter/nf_nat_proto_tcp.c
+++ b/net/netfilter/nf_nat_proto_tcp.c
@@ -18,16 +18,6 @@
#include <net/netfilter/nf_nat_l4proto.h>
#include <net/netfilter/nf_nat_core.h>
-static void
-tcp_unique_tuple(const struct nf_nat_l3proto *l3proto,
- struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range2 *range,
- enum nf_nat_manip_type maniptype,
- const struct nf_conn *ct)
-{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
-}
-
static bool
tcp_manip_pkt(struct sk_buff *skb,
const struct nf_nat_l3proto *l3proto,
@@ -75,7 +65,6 @@ const struct nf_nat_l4proto nf_nat_l4proto_tcp = {
.l4proto = IPPROTO_TCP,
.manip_pkt = tcp_manip_pkt,
.in_range = nf_nat_l4proto_in_range,
- .unique_tuple = tcp_unique_tuple,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
diff --git a/net/netfilter/nf_nat_proto_udp.c b/net/netfilter/nf_nat_proto_udp.c
index 208c14316359..26f3715a457a 100644
--- a/net/netfilter/nf_nat_proto_udp.c
+++ b/net/netfilter/nf_nat_proto_udp.c
@@ -18,16 +18,6 @@
#include <net/netfilter/nf_nat_l4proto.h>
static void
-udp_unique_tuple(const struct nf_nat_l3proto *l3proto,
- struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range2 *range,
- enum nf_nat_manip_type maniptype,
- const struct nf_conn *ct)
-{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
-}
-
-static void
__udp_manip_pkt(struct sk_buff *skb,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, struct udphdr *hdr,
@@ -92,21 +82,10 @@ static bool udplite_manip_pkt(struct sk_buff *skb,
return true;
}
-static void
-udplite_unique_tuple(const struct nf_nat_l3proto *l3proto,
- struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range2 *range,
- enum nf_nat_manip_type maniptype,
- const struct nf_conn *ct)
-{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
-}
-
const struct nf_nat_l4proto nf_nat_l4proto_udplite = {
.l4proto = IPPROTO_UDPLITE,
.manip_pkt = udplite_manip_pkt,
.in_range = nf_nat_l4proto_in_range,
- .unique_tuple = udplite_unique_tuple,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
@@ -117,7 +96,6 @@ const struct nf_nat_l4proto nf_nat_l4proto_udp = {
.l4proto = IPPROTO_UDP,
.manip_pkt = udp_manip_pkt,
.in_range = nf_nat_l4proto_in_range,
- .unique_tuple = udp_unique_tuple,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
--
2.11.0
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