From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 09/37] netfilter: nat: remove l4 protocol port rovers
Date: Fri, 21 Dec 2018 01:28:13 +0100 [thread overview]
Message-ID: <20181221002841.28587-10-pablo@netfilter.org> (raw)
In-Reply-To: <20181221002841.28587-1-pablo@netfilter.org>
From: Florian Westphal <fw@strlen.de>
This is a leftover from days where single-cpu systems were common:
Store last port used to resolve a clash to use it as a starting point when
the next conflict needs to be resolved.
When we have parallel attempt to connect to same address:port pair,
its likely that both cores end up computing the same "available" port,
as both use same starting port, and newly used ports won't become
visible to other cores until the conntrack gets confirmed later.
One of the cores then has to drop the packet at insertion time because
the chosen new tuple turns out to be in use after all.
Lets simplify this: remove port rover and use a pseudo-random starting
point.
Note that this doesn't make netfilter default to 'fully random' mode;
the 'rover' was only used if NAT could not reuse source port as-is.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/net/netfilter/nf_nat_l4proto.h | 2 +-
net/netfilter/nf_nat_proto_common.c | 8 ++------
net/netfilter/nf_nat_proto_dccp.c | 5 +----
net/netfilter/nf_nat_proto_sctp.c | 5 +----
net/netfilter/nf_nat_proto_tcp.c | 5 +----
net/netfilter/nf_nat_proto_udp.c | 10 ++--------
6 files changed, 8 insertions(+), 27 deletions(-)
diff --git a/include/net/netfilter/nf_nat_l4proto.h b/include/net/netfilter/nf_nat_l4proto.h
index b4d6b29bca62..7ecac2cd1020 100644
--- a/include/net/netfilter/nf_nat_l4proto.h
+++ b/include/net/netfilter/nf_nat_l4proto.h
@@ -74,7 +74,7 @@ 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, u16 *rover);
+ 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_proto_common.c b/net/netfilter/nf_nat_proto_common.c
index 5d849d835561..a7de939fa5a9 100644
--- a/net/netfilter/nf_nat_proto_common.c
+++ b/net/netfilter/nf_nat_proto_common.c
@@ -38,8 +38,7 @@ 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,
- u16 *rover)
+ const struct nf_conn *ct)
{
unsigned int range_size, min, max, i;
__be16 *portptr;
@@ -86,16 +85,13 @@ void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
} else if (range->flags & NF_NAT_RANGE_PROTO_OFFSET) {
off = (ntohs(*portptr) - ntohs(range->base_proto.all));
} else {
- off = *rover;
+ off = prandom_u32();
}
for (i = 0; ; ++off) {
*portptr = htons(min + off % range_size);
if (++i != range_size && nf_nat_used_tuple(tuple, ct))
continue;
- if (!(range->flags & (NF_NAT_RANGE_PROTO_RANDOM_ALL|
- NF_NAT_RANGE_PROTO_OFFSET)))
- *rover = off;
return;
}
}
diff --git a/net/netfilter/nf_nat_proto_dccp.c b/net/netfilter/nf_nat_proto_dccp.c
index 67ea0d83aa5a..7d4d2c124990 100644
--- a/net/netfilter/nf_nat_proto_dccp.c
+++ b/net/netfilter/nf_nat_proto_dccp.c
@@ -18,8 +18,6 @@
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
-static u_int16_t dccp_port_rover;
-
static void
dccp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
@@ -27,8 +25,7 @@ dccp_unique_tuple(const struct nf_nat_l3proto *l3proto,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
- &dccp_port_rover);
+ nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
}
static bool
diff --git a/net/netfilter/nf_nat_proto_sctp.c b/net/netfilter/nf_nat_proto_sctp.c
index 1c5d9b65fbba..f05ad8fa7b20 100644
--- a/net/netfilter/nf_nat_proto_sctp.c
+++ b/net/netfilter/nf_nat_proto_sctp.c
@@ -12,8 +12,6 @@
#include <net/netfilter/nf_nat_l4proto.h>
-static u_int16_t nf_sctp_port_rover;
-
static void
sctp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
@@ -21,8 +19,7 @@ sctp_unique_tuple(const struct nf_nat_l3proto *l3proto,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
- &nf_sctp_port_rover);
+ nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
}
static bool
diff --git a/net/netfilter/nf_nat_proto_tcp.c b/net/netfilter/nf_nat_proto_tcp.c
index f15fcd475f98..c312e6b3e2ea 100644
--- a/net/netfilter/nf_nat_proto_tcp.c
+++ b/net/netfilter/nf_nat_proto_tcp.c
@@ -18,8 +18,6 @@
#include <net/netfilter/nf_nat_l4proto.h>
#include <net/netfilter/nf_nat_core.h>
-static u16 tcp_port_rover;
-
static void
tcp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
@@ -27,8 +25,7 @@ tcp_unique_tuple(const struct nf_nat_l3proto *l3proto,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
- &tcp_port_rover);
+ nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
}
static bool
diff --git a/net/netfilter/nf_nat_proto_udp.c b/net/netfilter/nf_nat_proto_udp.c
index 5790f70a83b2..208c14316359 100644
--- a/net/netfilter/nf_nat_proto_udp.c
+++ b/net/netfilter/nf_nat_proto_udp.c
@@ -17,8 +17,6 @@
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
-static u16 udp_port_rover;
-
static void
udp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
@@ -26,8 +24,7 @@ udp_unique_tuple(const struct nf_nat_l3proto *l3proto,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
- &udp_port_rover);
+ nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
}
static void
@@ -79,8 +76,6 @@ static bool udp_manip_pkt(struct sk_buff *skb,
}
#ifdef CONFIG_NF_NAT_PROTO_UDPLITE
-static u16 udplite_port_rover;
-
static bool udplite_manip_pkt(struct sk_buff *skb,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
@@ -104,8 +99,7 @@ udplite_unique_tuple(const struct nf_nat_l3proto *l3proto,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
- nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
- &udplite_port_rover);
+ nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct);
}
const struct nf_nat_l4proto nf_nat_l4proto_udplite = {
--
2.11.0
next prev parent reply other threads:[~2018-12-21 0:29 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-21 0:28 [PATCH 00/37] Netfilter updates for net-next Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 01/37] netfilter: ipset: Allow matching on destination MAC address for mac and ipmac sets Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 02/37] netfilter: ipset: Make invalid MAC address checks consistent Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 03/37] netfilter: ipset: Introduction of new commands and protocol version 7 Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 04/37] netfilter: ctnetlink: always honor CTA_MARK_MASK Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 05/37] netfilter: nf_flow_table: make nf_flow_table_iterate() static Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 06/37] netfilter: nf_flow_table: simplify nf_flow_offload_gc_step() Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 07/37] netfilter: Replace call_rcu_bh(), rcu_barrier_bh(), and synchronize_rcu_bh() Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 08/37] netfilter: remove NFC_* cache bits Pablo Neira Ayuso
2018-12-21 0:28 ` Pablo Neira Ayuso [this message]
2018-12-21 0:28 ` [PATCH 10/37] netfilter: ipset: fix ip_set_byindex function Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 11/37] netfilter: ipset: replace a strncpy() with strscpy() Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 12/37] netfilter: nat: remove unnecessary 'else if' branch Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 13/37] netfilter: nat: limit port clash resolution attempts Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 14/37] netfilter: remove unused parameters in nf_ct_l4proto_[un]register_sysctl() Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 15/37] netfilter: remove NF_NAT_RANGE_PROTO_RANDOM support Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 16/37] netfilter: nat: un-export nf_nat_l4proto_unique_tuple Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 17/37] netfilter: nat: remove l4proto->unique_tuple Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 18/37] netfilter: nat: fold in_range indirection into caller Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 19/37] netfilter: nat: remove l4proto->in_range Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 20/37] netfilter: nat: remove l4proto->nlattr_to_range Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 21/37] netfilter: nat: remove l4proto->manip_pkt Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 22/37] netfilter: nat: remove nf_nat_l4proto struct Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 23/37] netfilter: nf_nat_sip: fix RTP/RTCP source port translations Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 24/37] netfilter: nf_tables: Speed up selective rule dumps Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 25/37] netfilter: ipt_CLUSTERIP: fix deadlock in netns exit routine Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 26/37] netfilter: ipt_CLUSTERIP: remove wrong WARN_ON_ONCE " Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 27/37] netfilter: ipt_CLUSTERIP: fix sleep-in-atomic bug in clusterip_config_entry_put() Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 28/37] netfilter: ipt_CLUSTERIP: check MAC address when duplicate config is set Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 29/37] netfilter: conntrack: udp: only extend timeout to stream mode after 2s Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 30/37] netfilter: conntrack: udp: set stream timeout to 2 minutes Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 31/37] netfilter: conntrack: register sysctl table for gre Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 32/37] netfilter: conntrack: un-export seq_print_acct Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 33/37] netfilter: conntrack: add mnemonics for sysctl table Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 34/37] netfilter: conntrack: merge acct and helper sysctl table with main one Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 35/37] netfilter: conntrack: merge ecache and timestamp sysctl tables " Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 36/37] netfilter: conntrack: remove empty pernet fini stubs Pablo Neira Ayuso
2018-12-21 0:28 ` [PATCH 37/37] netfilter: netns: shrink netns_ct struct Pablo Neira Ayuso
2018-12-21 2:48 ` [PATCH 00/37] Netfilter updates for net-next David Miller
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