diff --git a/include/net/netns/netfilter.h b/include/net/netns/netfilter.h
index 02bbdc577f8e2881c50e7eaccf9f1c4223d9da50..a6a0bf4a247e51e95189d98f5438a12cfe3cfb74 100644
--- a/include/net/netns/netfilter.h
+++ b/include/net/netns/netfilter.h
@@ -15,6 +15,9 @@ struct netns_nf {
const struct nf_logger __rcu *nf_loggers[NFPROTO_NUMPROTO];
#ifdef CONFIG_SYSCTL
struct ctl_table_header *nf_log_dir_header;
+#ifdef CONFIG_LWTUNNEL
+ struct ctl_table_header *nf_lwtnl_dir_header;
+#endif
#endif
struct nf_hook_entries __rcu *hooks_ipv4[NF_INET_NUMHOOKS];
struct nf_hook_entries __rcu *hooks_ipv6[NF_INET_NUMHOOKS];
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index 24e2b4b494cb083acd9e3500c4433e1a4939e1ee..c434940131b1d0e1621e541636b2067d4177887c 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -941,8 +941,8 @@ static int input_action_end_dx6(struct sk_buff *skb,
if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
- dev_net(skb->dev), NULL, skb, NULL,
- skb_dst(skb)->dev, input_action_end_dx6_finish);
+ dev_net(skb->dev), NULL, skb, skb->dev,
+ NULL, input_action_end_dx6_finish);
return input_action_end_dx6_finish(dev_net(skb->dev), NULL, skb);
drop:
@@ -991,8 +991,8 @@ static int input_action_end_dx4(struct sk_buff *skb,
if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING,
- dev_net(skb->dev), NULL, skb, NULL,
- skb_dst(skb)->dev, input_action_end_dx4_finish);
+ dev_net(skb->dev), NULL, skb, skb->dev,
+ NULL, input_action_end_dx4_finish);
return input_action_end_dx4_finish(dev_net(skb->dev), NULL, skb);
drop:
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 3126911f5042592a33594053c1225c265a2fd2c1..b00fc285b3349914eb3b2ea9bc921397568aafb6 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -815,12 +815,21 @@ int __init netfilter_init(void)
if (ret < 0)
goto err;
+#ifdef CONFIG_LWTUNNEL
+ ret = netfilter_lwtunnel_init();
+ if (ret < 0)
+ goto err_lwtunnel_pernet;
+#endif
ret = netfilter_log_init();
if (ret < 0)
- goto err_pernet;
+ goto err_log_pernet;
return 0;
-err_pernet:
+err_log_pernet:
+#ifdef CONFIG_LWTUNNEL
+ netfilter_lwtunnel_fini();
+err_lwtunnel_pernet:
+#endif
unregister_pernet_subsys(&netfilter_net_ops);
err:
return ret;
diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index c7ae4d9bf3d24ceafdddb3e7aa0b8c8bc36e695d..61431690cbd5f195ca27a90661c3838189e2330d 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -53,12 +53,13 @@ MODULE_DESCRIPTION("core IP set support");
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET);
/* When the nfnl mutex or ip_set_ref_lock is held: */
-#define ip_set_dereference(p) \
- rcu_dereference_protected(p, \
+#define ip_set_dereference(inst) \
+ rcu_dereference_protected((inst)->ip_set_list, \
lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET) || \
- lockdep_is_held(&ip_set_ref_lock))
+ lockdep_is_held(&ip_set_ref_lock) || \
+ (inst)->is_deleted)
#define ip_set(inst, id) \
- ip_set_dereference((inst)->ip_set_list)[id]
+ ip_set_dereference(inst)[id]
#define ip_set_ref_netlink(inst,id) \
rcu_dereference_raw((inst)->ip_set_list)[id]
#define ip_set_dereference_nfnl(p) \
@@ -1133,7 +1134,7 @@ static int ip_set_create(struct sk_buff *skb, const struct nfnl_info *info,
if (!list)
goto cleanup;
/* nfnl mutex is held, both lists are valid */
- tmp = ip_set_dereference(inst->ip_set_list);
+ tmp = ip_set_dereference(inst);
memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max);
rcu_assign_pointer(inst->ip_set_list, list);
/* Make sure all current packets have passed through */
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 74112e9c5dabc3f045392edd789b9f4decef5d61..6c40bdf8b05ab5bfbcf0e56cb6ba5bedb3f95ad9 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -22,9 +22,6 @@
#include <net/netfilter/nf_conntrack_acct.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_conntrack_timestamp.h>
-#ifdef CONFIG_LWTUNNEL
-#include <net/netfilter/nf_hooks_lwtunnel.h>
-#endif
#include <linux/rculist_nulls.h>
static bool enable_hooks __read_mostly;
@@ -612,9 +609,6 @@ enum nf_ct_sysctl_index {
NF_SYSCTL_CT_PROTO_TIMEOUT_GRE,
NF_SYSCTL_CT_PROTO_TIMEOUT_GRE_STREAM,
#endif
-#ifdef CONFIG_LWTUNNEL
- NF_SYSCTL_CT_LWTUNNEL,
-#endif
NF_SYSCTL_CT_LAST_SYSCTL,
};
@@ -946,15 +940,6 @@ static struct ctl_table nf_ct_sysctl_table[] = {
.proc_handler = proc_dointvec_jiffies,
},
#endif
-#ifdef CONFIG_LWTUNNEL
- [NF_SYSCTL_CT_LWTUNNEL] = {
- .procname = "nf_hooks_lwtunnel",
- .data = NULL,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = nf_hooks_lwtunnel_sysctl_handler,
- },
-#endif
};
static struct ctl_table nf_ct_netfilter_table[] = {
diff --git a/net/netfilter/nf_hooks_lwtunnel.c b/net/netfilter/nf_hooks_lwtunnel.c
index 00e89ffd78f69216388d40c937928d187b776db6..7cdb59bb4459f377ca1f1443657baeb16648ecc0 100644
--- a/net/netfilter/nf_hooks_lwtunnel.c
+++ b/net/netfilter/nf_hooks_lwtunnel.c
@@ -3,6 +3,9 @@
#include <linux/sysctl.h>
#include <net/lwtunnel.h>
#include <net/netfilter/nf_hooks_lwtunnel.h>
+#include <linux/netfilter.h>
+
+#include "nf_internals.h"
static inline int nf_hooks_lwtunnel_get(void)
{
@@ -50,4 +53,68 @@ int nf_hooks_lwtunnel_sysctl_handler(struct ctl_table *table, int write,
return ret;
}
EXPORT_SYMBOL_GPL(nf_hooks_lwtunnel_sysctl_handler);
+
+static struct ctl_table nf_lwtunnel_sysctl_table[] = {
+ {
+ .procname = "nf_hooks_lwtunnel",
+ .data = NULL,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = nf_hooks_lwtunnel_sysctl_handler,
+ },
+};
+
+static int __net_init nf_lwtunnel_net_init(struct net *net)
+{
+ struct ctl_table_header *hdr;
+ struct ctl_table *table;
+
+ table = nf_lwtunnel_sysctl_table;
+ if (!net_eq(net, &init_net)) {
+ table = kmemdup(nf_lwtunnel_sysctl_table,
+ sizeof(nf_lwtunnel_sysctl_table),
+ GFP_KERNEL);
+ if (!table)
+ goto err_alloc;
+ }
+
+ hdr = register_net_sysctl_sz(net, "net/netfilter", table,
+ ARRAY_SIZE(nf_lwtunnel_sysctl_table));
+ if (!hdr)
+ goto err_reg;
+
+ net->nf.nf_lwtnl_dir_header = hdr;
+
+ return 0;
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void __net_exit nf_lwtunnel_net_exit(struct net *net)
+{
+ const struct ctl_table *table;
+
+ table = net->nf.nf_lwtnl_dir_header->ctl_table_arg;
+ unregister_net_sysctl_table(net->nf.nf_lwtnl_dir_header);
+ if (!net_eq(net, &init_net))
+ kfree(table);
+}
+
+static struct pernet_operations nf_lwtunnel_net_ops = {
+ .init = nf_lwtunnel_net_init,
+ .exit = nf_lwtunnel_net_exit,
+};
+
+int __init netfilter_lwtunnel_init(void)
+{
+ return register_pernet_subsys(&nf_lwtunnel_net_ops);
+}
+
+void netfilter_lwtunnel_fini(void)
+{
+ unregister_pernet_subsys(&nf_lwtunnel_net_ops);
+}
#endif /* CONFIG_SYSCTL */
diff --git a/net/netfilter/nf_internals.h b/net/netfilter/nf_internals.h
index 832ae64179f0f2e2e5c51812551dfc4029f8cc0b..25403023060b6d6763c16f860aff60884b78a863 100644
--- a/net/netfilter/nf_internals.h
+++ b/net/netfilter/nf_internals.h
@@ -29,6 +29,12 @@ void nf_queue_nf_hook_drop(struct net *net);
/* nf_log.c */
int __init netfilter_log_init(void);
+#ifdef CONFIG_LWTUNNEL
+/* nf_hooks_lwtunnel.c */
+int __init netfilter_lwtunnel_init(void);
+void netfilter_lwtunnel_fini(void);
+#endif
+
/* core.c */
void nf_hook_entries_delete_raw(struct nf_hook_entries __rcu **pp,
const struct nf_hook_ops *reg);
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index bd01e4a0be2c29663097f149cc359a892793611e..d9393569d03a49b07334a94c89e52dbb9ffa281a 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -43,6 +43,8 @@ TEST_PROGS += srv6_hl2encap_red_l2vpn_test.sh
TEST_PROGS += srv6_end_next_csid_l3vpn_test.sh
TEST_PROGS += srv6_end_x_next_csid_l3vpn_test.sh
TEST_PROGS += srv6_end_flavors_test.sh
+TEST_PROGS += srv6_end_dx4_netfilter_test.sh
+TEST_PROGS += srv6_end_dx6_netfilter_test.sh
TEST_PROGS += vrf_strict_mode_test.sh
TEST_PROGS += arp_ndisc_evict_nocarrier.sh
TEST_PROGS += ndisc_unsolicited_na_test.sh
diff --git a/tools/testing/selftests/net/config b/tools/testing/selftests/net/config
index 04de7a6ba6f31810b082db2c0d90f6eacfb658a0..d4891f7a2bfae141635e8709b814fe02b3767819 100644
--- a/tools/testing/selftests/net/config
+++ b/tools/testing/selftests/net/config
@@ -101,3 +101,5 @@ CONFIG_NETFILTER_XT_MATCH_POLICY=m
CONFIG_CRYPTO_ARIA=y
CONFIG_XFRM_INTERFACE=m
CONFIG_XFRM_USER=m
+CONFIG_IP_NF_MATCH_RPFILTER=m
+CONFIG_IP6_NF_MATCH_RPFILTER=m
diff --git a/tools/testing/selftests/net/srv6_end_dx4_netfilter_test.sh b/tools/testing/selftests/net/srv6_end_dx4_netfilter_test.sh
new file mode 100755
index 0000000000000000000000000000000000000000..e23210aa547fd55ec421b0ed499f02a5c183657a
--- /dev/null
+++ b/tools/testing/selftests/net/srv6_end_dx4_netfilter_test.sh
@@ -0,0 +1,335 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# author: Jianguo Wu <wujianguo@chinatelecom.cn>
+#
+# Mostly copied from tools/testing/selftests/net/srv6_end_dt4_l3vpn_test.sh.
+#
+# This script is designed for testing the support of netfilter hooks for
+# SRv6 End.DX4 behavior.
+#
+# Hereafter a network diagram is shown, where one tenants (named 100) offer
+# IPv4 L3 VPN services allowing hosts to communicate with each other across
+# an IPv6 network.
+#
+# Routers rt-1 and rt-2 implement IPv4 L3 VPN services leveraging the SRv6
+# architecture. The key components for such VPNs are: a) SRv6 Encap behavior,
+# b) SRv6 End.DX4 behavior.
+#
+# To explain how an IPv4 L3 VPN based on SRv6 works, let us briefly consider an
+# example where, within the same domain of tenant 100, the host hs-1 pings
+# the host hs-2.
+#
+# First of all, L2 reachability of the host hs-2 is taken into account by
+# the router rt-1 which acts as an arp proxy.
+#
+# When the host hs-1 sends an IPv4 packet destined to hs-2, the router rt-1
+# receives the packet on the internal veth-t100 interface, rt-1 contains the
+# SRv6 Encap route for encapsulating the IPv4 packet in a IPv6 plus the Segment
+# Routing Header (SRH) packet. This packet is sent through the (IPv6) core
+# network up to the router rt-2 that receives it on veth0 interface.
+#
+# The rt-2 router uses the 'localsid' routing table to process incoming
+# IPv6+SRH packets which belong to the VPN of the tenant 100. For each of these
+# packets, the SRv6 End.DX4 behavior removes the outer IPv6+SRH headers and
+# routs the packet to the specified nexthop. Afterwards, the packet is sent to
+# the host hs-2 through the veth-t100 interface.
+#
+# The ping response follows the same processing but this time the role of rt-1
+# and rt-2 are swapped.
+#
+# And when net.netfilter.nf_hooks_lwtunnel is set to 1 in rt-1 or rt-2, and a
+# rpfilter iptables rule is added, SRv6 packets will go through netfilter PREROUTING
+# hooks.
+#
+#
+# +-------------------+ +-------------------+
+# | | | |
+# | hs-1 netns | | hs-2 netns |
+# | | | |
+# | +-------------+ | | +-------------+ |
+# | | veth0 | | | | veth0 | |
+# | | 10.0.0.1/24 | | | | 10.0.0.2/24 | |
+# | +-------------+ | | +-------------+ |
+# | . | | . |
+# +-------------------+ +-------------------+
+# . .
+# . .
+# . .
+# +-----------------------------------+ +-----------------------------------+
+# | . | | . |
+# | +---------------+ | | +---------------- |
+# | | veth-t100 | | | | veth-t100 | |
+# | | 10.0.0.11/24 | +----------+ | | +----------+ | 10.0.0.22/24 | |
+# | +-------+-------+ | route | | | | route | +-------+-------- |
+# | | table | | | | table | |
+# | +----------+ | | +----------+ |
+# | +--------------+ | | +--------------+ |
+# | | veth0 | | | | veth0 | |
+# | | 2001:11::1/64 |.|...|.| 2001:11::2/64 | |
+# | +--------------+ | | +--------------+ |
+# | | | |
+# | rt-1 netns | | rt-2 netns |
+# | | | |
+# +-----------------------------------+ +-----------------------------------+
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~
+# | Network configuration |
+# ~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+# rt-1: localsid table
+# +----------------------------------------------------------------+
+# |SID |Action |
+# +----------------------------------------------------------------+
+# |fc00:21:100::6004|apply SRv6 End.DX4 nh4 10.0.0.1 dev veth-t100 |
+# +----------------------------------------------------------------+
+#
+# rt-1: route table
+# +---------------------------------------------------+
+# |host |Action |
+# +---------------------------------------------------+
+# |10.0.0.2 |apply seg6 encap segs fc00:12:100::6004|
+# +---------------------------------------------------+
+# |10.0.0.0/24|forward to dev veth_t100 |
+# +---------------------------------------------------+
+#
+#
+# rt-2: localsid table
+# +---------------------------------------------------------------+
+# |SID |Action |
+# +---------------------------------------------------------------+
+# |fc00:12:100::6004|apply SRv6 End.DX4 nh4 10.0.0.2 dev veth-t100|
+# +---------------------------------------------------------------+
+#
+# rt-2: route table
+# +---------------------------------------------------+
+# |host |Action |
+# +---------------------------------------------------+
+# |10.0.0.1 |apply seg6 encap segs fc00:21:100::6004|
+# +---------------------------------------------------+
+# |10.0.0.0/24|forward to dev veth_t100 |
+# +---------------------------------------------------+
+#
+
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+readonly IPv6_RT_NETWORK=2001:11
+readonly IPv4_HS_NETWORK=10.0.0
+readonly SID_LOCATOR=fc00
+
+PING_TIMEOUT_SEC=4
+
+ret=0
+
+PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
+
+log_test()
+{
+ local rc=$1
+ local expected=$2
+ local msg="$3"
+
+ if [ ${rc} -eq ${expected} ]; then
+ nsuccess=$((nsuccess+1))
+ printf "\n TEST: %-60s [ OK ]\n" "${msg}"
+ else
+ ret=1
+ nfail=$((nfail+1))
+ printf "\n TEST: %-60s [FAIL]\n" "${msg}"
+ if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
+ echo
+ echo "hit enter to continue, 'q' to quit"
+ read a
+ [ "$a" = "q" ] && exit 1
+ fi
+ fi
+}
+
+print_log_test_results()
+{
+ if [ "$TESTS" != "none" ]; then
+ printf "\nTests passed: %3d\n" ${nsuccess}
+ printf "Tests failed: %3d\n" ${nfail}
+ fi
+}
+
+log_section()
+{
+ echo
+ echo "################################################################################"
+ echo "TEST SECTION: $*"
+ echo "################################################################################"
+}
+
+cleanup()
+{
+ ip link del veth-rt-1 2>/dev/null || true
+ ip link del veth-rt-2 2>/dev/null || true
+
+ # destroy routers rt-* and hosts hs-*
+ for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do
+ ip netns del ${ns} || true
+ done
+}
+
+# Setup the basic networking for the routers
+setup_rt_networking()
+{
+ local rt=$1
+ local nsname=rt-${rt}
+
+ ip netns add ${nsname}
+
+ ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
+ ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
+
+ ip link set veth-rt-${rt} netns ${nsname}
+ ip -netns ${nsname} link set veth-rt-${rt} name veth0
+
+ ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/64 dev veth0 nodad
+ ip -netns ${nsname} link set veth0 up
+ ip -netns ${nsname} link set lo up
+
+ ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1
+ ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
+}
+
+setup_rt_netfilter()
+{
+ local rt=$1
+ local nsname=rt-${rt}
+
+ ip netns exec ${nsname} sysctl -wq net.netfilter.nf_hooks_lwtunnel=1
+ ip netns exec ${nsname} iptables -t raw -A PREROUTING -m rpfilter --invert -j DROP
+}
+
+setup_hs()
+{
+ local hs=$1
+ local rt=$2
+ local tid=$3
+ local hsname=hs-${hs}
+ local rtname=rt-${rt}
+ local rtveth=veth-t${tid}
+
+ # set the networking for the host
+ ip netns add ${hsname}
+
+ ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
+ ip -netns ${hsname} link set ${rtveth} netns ${rtname}
+ ip -netns ${hsname} addr add ${IPv4_HS_NETWORK}.${hs}/24 dev veth0
+ ip -netns ${hsname} link set veth0 up
+ ip -netns ${hsname} link set lo up
+
+ ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.${rt}${hs}/24 dev ${rtveth}
+ ip -netns ${rtname} link set ${rtveth} up
+
+ ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1
+}
+
+setup_vpn_config()
+{
+ local hssrc=$1
+ local rtsrc=$2
+ local hsdst=$3
+ local rtdst=$4
+ local tid=$5
+
+ local hssrc_name=hs-t${tid}-${hssrc}
+ local hsdst_name=hs-t${tid}-${hsdst}
+ local rtsrc_name=rt-${rtsrc}
+ local rtdst_name=rt-${rtdst}
+ local vpn_sid=${SID_LOCATOR}:${hssrc}${hsdst}:${tid}::6004
+
+ # set the encap route for encapsulating packets which arrive from the
+ # host hssrc and destined to the access router rtsrc.
+ ip -netns ${rtsrc_name} -4 route add ${IPv4_HS_NETWORK}.${hsdst}/32 \
+ encap seg6 mode encap segs ${vpn_sid} dev veth0
+ ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 \
+ via 2001:11::${rtdst} dev veth0
+
+ # set the decap route for decapsulating packets which arrive from
+ # the rtdst router and destined to the hsdst host.
+ ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 \
+ encap seg6local action End.DX4 nh4 ${IPv4_HS_NETWORK}.${hsdst} dev veth-t${tid}
+}
+
+setup()
+{
+ ip link add veth-rt-1 type veth peer name veth-rt-2
+ # setup the networking for router rt-1 and router rt-2
+ setup_rt_networking 1
+ setup_rt_networking 2
+
+ # setup two hosts for the tenant 100.
+ # - host hs-1 is directly connected to the router rt-1;
+ # - host hs-2 is directly connected to the router rt-2.
+ setup_hs 1 1 100
+ setup_hs 2 2 100
+
+ # setup the IPv4 L3 VPN which connects the host hs-1 and host hs-2.
+ setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant
+ setup_vpn_config 2 2 1 1 100
+}
+
+check_hs_connectivity()
+{
+ local hssrc=$1
+ local hsdst=$2
+ local tid=$3
+
+ ip netns exec hs-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
+ ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1
+}
+
+check_and_log_hs_connectivity()
+{
+ local hssrc=$1
+ local hsdst=$2
+ local tid=$3
+
+ check_hs_connectivity ${hssrc} ${hsdst} ${tid}
+ log_test $? 0 "Hosts connectivity: hs-${hssrc} -> hs-${hsdst} (tenant ${tid})"
+}
+
+host_tests()
+{
+ log_section "SRv6 VPN connectivity test among hosts in the same tenant"
+
+ check_and_log_hs_connectivity 1 2 100
+ check_and_log_hs_connectivity 2 1 100
+}
+
+router_netfilter_tests()
+{
+ log_section "SRv6 VPN connectivity test with netfilter enabled in routers"
+ setup_rt_netfilter 1
+ setup_rt_netfilter 2
+
+ check_and_log_hs_connectivity 1 2 100
+ check_and_log_hs_connectivity 2 1 100
+}
+
+if [ "$(id -u)" -ne 0 ];then
+ echo "SKIP: Need root privileges"
+ exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v ip)" ]; then
+ echo "SKIP: Could not run test without ip tool"
+ exit $ksft_skip
+fi
+
+cleanup &>/dev/null
+
+setup
+
+host_tests
+router_netfilter_tests
+
+print_log_test_results
+
+cleanup &>/dev/null
+
+exit ${ret}
diff --git a/tools/testing/selftests/net/srv6_end_dx6_netfilter_test.sh b/tools/testing/selftests/net/srv6_end_dx6_netfilter_test.sh
new file mode 100755
index 0000000000000000000000000000000000000000..9e69a2ed5bc345047ab7391a9043f76fe48ec77e
--- /dev/null
+++ b/tools/testing/selftests/net/srv6_end_dx6_netfilter_test.sh
@@ -0,0 +1,340 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# author: Jianguo Wu <wujianguo@chinatelecom.cn>
+#
+# Mostly copied from tools/testing/selftests/net/srv6_end_dt6_l3vpn_test.sh.
+#
+# This script is designed for testing the support of netfilter hooks for
+# SRv6 End.DX4 behavior.
+#
+# Hereafter a network diagram is shown, where one tenants (named 100) offer
+# IPv6 L3 VPN services allowing hosts to communicate with each other across
+# an IPv6 network.
+#
+# Routers rt-1 and rt-2 implement IPv6 L3 VPN services leveraging the SRv6
+# architecture. The key components for such VPNs are: a) SRv6 Encap behavior,
+# b) SRv6 End.DX4 behavior.
+#
+# To explain how an IPv6 L3 VPN based on SRv6 works, let us briefly consider an
+# example where, within the same domain of tenant 100, the host hs-1 pings
+# the host hs-2.
+#
+# First of all, L2 reachability of the host hs-2 is taken into account by
+# the router rt-1 which acts as an arp proxy.
+#
+# When the host hs-1 sends an IPv6 packet destined to hs-2, the router rt-1
+# receives the packet on the internal veth-t100 interface, rt-1 contains the
+# SRv6 Encap route for encapsulating the IPv6 packet in a IPv6 plus the Segment
+# Routing Header (SRH) packet. This packet is sent through the (IPv6) core
+# network up to the router rt-2 that receives it on veth0 interface.
+#
+# The rt-2 router uses the 'localsid' routing table to process incoming
+# IPv6+SRH packets which belong to the VPN of the tenant 100. For each of these
+# packets, the SRv6 End.DX4 behavior removes the outer IPv6+SRH headers and
+# routs the packet to the specified nexthop. Afterwards, the packet is sent to
+# the host hs-2 through the veth-t100 interface.
+#
+# The ping response follows the same processing but this time the role of rt-1
+# and rt-2 are swapped.
+#
+# And when net.netfilter.nf_hooks_lwtunnel is set to 1 in rt-1 or rt-2, and a
+# rpfilter iptables rule is added, SRv6 packets will go through netfilter PREROUTING
+# hooks.
+#
+#
+# +-------------------+ +-------------------+
+# | | | |
+# | hs-1 netns | | hs-2 netns |
+# | | | |
+# | +-------------+ | | +-------------+ |
+# | | veth0 | | | | veth0 | |
+# | | cafe::1/64 | | | | cafe::2/64 | |
+# | +-------------+ | | +-------------+ |
+# | . | | . |
+# +-------------------+ +-------------------+
+# . .
+# . .
+# . .
+# +-----------------------------------+ +-----------------------------------+
+# | . | | . |
+# | +---------------+ | | +---------------- |
+# | | veth-t100 | | | | veth-t100 | |
+# | | cafe::11/64 | +----------+ | | +----------+ | cafe::22/64 | |
+# | +-------+-------+ | route | | | | route | +-------+-------- |
+# | | table | | | | table | |
+# | +----------+ | | +----------+ |
+# | +--------------+ | | +--------------+ |
+# | | veth0 | | | | veth0 | |
+# | | 2001:11::1/64 |.|...|.| 2001:11::2/64 | |
+# | +--------------+ | | +--------------+ |
+# | | | |
+# | rt-1 netns | | rt-2 netns |
+# | | | |
+# +-----------------------------------+ +-----------------------------------+
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~
+# | Network configuration |
+# ~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+# rt-1: localsid table
+# +----------------------------------------------------------------+
+# |SID |Action |
+# +----------------------------------------------------------------+
+# |fc00:21:100::6004|apply SRv6 End.DX6 nh6 cafe::1 dev veth-t100 |
+# +----------------------------------------------------------------+
+#
+# rt-1: route table
+# +---------------------------------------------------+
+# |host |Action |
+# +---------------------------------------------------+
+# |cafe::2 |apply seg6 encap segs fc00:12:100::6004|
+# +---------------------------------------------------+
+# |cafe::/64 |forward to dev veth_t100 |
+# +---------------------------------------------------+
+#
+#
+# rt-2: localsid table
+# +---------------------------------------------------------------+
+# |SID |Action |
+# +---------------------------------------------------------------+
+# |fc00:12:100::6004|apply SRv6 End.DX6 nh6 cafe::2 dev veth-t100 |
+# +---------------------------------------------------------------+
+#
+# rt-2: route table
+# +---------------------------------------------------+
+# |host |Action |
+# +---------------------------------------------------+
+# |cafe::1 |apply seg6 encap segs fc00:21:100::6004|
+# +---------------------------------------------------+
+# |cafe::/64 |forward to dev veth_t100 |
+# +---------------------------------------------------+
+#
+
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+readonly IPv6_RT_NETWORK=2001:11
+readonly IPv6_HS_NETWORK=cafe
+readonly SID_LOCATOR=fc00
+
+PING_TIMEOUT_SEC=4
+
+ret=0
+
+PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
+
+log_test()
+{
+ local rc=$1
+ local expected=$2
+ local msg="$3"
+
+ if [ ${rc} -eq ${expected} ]; then
+ nsuccess=$((nsuccess+1))
+ printf "\n TEST: %-60s [ OK ]\n" "${msg}"
+ else
+ ret=1
+ nfail=$((nfail+1))
+ printf "\n TEST: %-60s [FAIL]\n" "${msg}"
+ if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
+ echo
+ echo "hit enter to continue, 'q' to quit"
+ read a
+ [ "$a" = "q" ] && exit 1
+ fi
+ fi
+}
+
+print_log_test_results()
+{
+ if [ "$TESTS" != "none" ]; then
+ printf "\nTests passed: %3d\n" ${nsuccess}
+ printf "Tests failed: %3d\n" ${nfail}
+ fi
+}
+
+log_section()
+{
+ echo
+ echo "################################################################################"
+ echo "TEST SECTION: $*"
+ echo "################################################################################"
+}
+
+cleanup()
+{
+ ip link del veth-rt-1 2>/dev/null || true
+ ip link del veth-rt-2 2>/dev/null || true
+
+ # destroy routers rt-* and hosts hs-*
+ for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do
+ ip netns del ${ns} || true
+ done
+}
+
+# Setup the basic networking for the routers
+setup_rt_networking()
+{
+ local rt=$1
+ local nsname=rt-${rt}
+
+ ip netns add ${nsname}
+
+ ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
+ ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
+
+ ip link set veth-rt-${rt} netns ${nsname}
+ ip -netns ${nsname} link set veth-rt-${rt} name veth0
+
+ ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/64 dev veth0 nodad
+ ip -netns ${nsname} link set veth0 up
+ ip -netns ${nsname} link set lo up
+
+ ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
+}
+
+setup_rt_netfilter()
+{
+ local rt=$1
+ local nsname=rt-${rt}
+
+ ip netns exec ${nsname} sysctl -wq net.netfilter.nf_hooks_lwtunnel=1
+ ip netns exec ${nsname} ip6tables -t raw -A PREROUTING -m rpfilter --invert -j DROP
+}
+
+setup_hs()
+{
+ local hs=$1
+ local rt=$2
+ local tid=$3
+ local hsname=hs-${hs}
+ local rtname=rt-${rt}
+ local rtveth=veth-t${tid}
+
+ # set the networking for the host
+ ip netns add ${hsname}
+
+ ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
+ ip -netns ${hsname} link set ${rtveth} netns ${rtname}
+ ip -netns ${hsname} addr add ${IPv6_HS_NETWORK}::${hs}/64 dev veth0 nodad
+ ip -netns ${hsname} link set veth0 up
+ ip -netns ${hsname} link set lo up
+
+ ip -netns ${rtname} addr add ${IPv6_HS_NETWORK}::${rt}${hs}/64 dev ${rtveth}
+ ip -netns ${rtname} link set ${rtveth} up
+
+ ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0
+ ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0
+
+ ip netns exec ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1
+}
+
+setup_vpn_config()
+{
+ local hssrc=$1
+ local rtsrc=$2
+ local hsdst=$3
+ local rtdst=$4
+ local tid=$5
+
+ local hssrc_name=hs-t${tid}-${hssrc}
+ local hsdst_name=hs-t${tid}-${hsdst}
+ local rtsrc_name=rt-${rtsrc}
+ local rtdst_name=rt-${rtdst}
+ local rtveth=veth-t${tid}
+ local vpn_sid=${SID_LOCATOR}:${hssrc}${hsdst}:${tid}::6004
+
+ ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
+
+ # set the encap route for encapsulating packets which arrive from the
+ # host hssrc and destined to the access router rtsrc.
+ ip -netns ${rtsrc_name} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 \
+ encap seg6 mode encap segs ${vpn_sid} dev veth0
+ ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 \
+ via 2001:11::${rtdst} dev veth0
+
+ # set the decap route for decapsulating packets which arrive from
+ # the rtdst router and destined to the hsdst host.
+ ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 \
+ encap seg6local action End.DX6 nh6 ${IPv6_HS_NETWORK}::${hsdst} dev veth-t${tid}
+}
+
+setup()
+{
+ ip link add veth-rt-1 type veth peer name veth-rt-2
+ # setup the networking for router rt-1 and router rt-2
+ setup_rt_networking 1
+ setup_rt_networking 2
+
+ # setup two hosts for the tenant 100.
+ # - host hs-1 is directly connected to the router rt-1;
+ # - host hs-2 is directly connected to the router rt-2.
+ setup_hs 1 1 100
+ setup_hs 2 2 100
+
+ # setup the IPv4 L3 VPN which connects the host hs-1 and host hs-2.
+ setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant
+ setup_vpn_config 2 2 1 1 100
+}
+
+check_hs_connectivity()
+{
+ local hssrc=$1
+ local hsdst=$2
+ local tid=$3
+
+ ip netns exec hs-${hssrc} ping -6 -c 1 -W ${PING_TIMEOUT_SEC} \
+ ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1
+}
+
+check_and_log_hs_connectivity()
+{
+ local hssrc=$1
+ local hsdst=$2
+ local tid=$3
+
+ check_hs_connectivity ${hssrc} ${hsdst} ${tid}
+ log_test $? 0 "Hosts connectivity: hs-${hssrc} -> hs-${hsdst} (tenant ${tid})"
+}
+
+host_tests()
+{
+ log_section "SRv6 VPN connectivity test among hosts in the same tenant"
+
+ check_and_log_hs_connectivity 1 2 100
+ check_and_log_hs_connectivity 2 1 100
+}
+
+router_netfilter_tests()
+{
+ log_section "SRv6 VPN connectivity test with netfilter enabled in routers"
+ setup_rt_netfilter 1
+ setup_rt_netfilter 2
+
+ check_and_log_hs_connectivity 1 2 100
+ check_and_log_hs_connectivity 2 1 100
+}
+
+if [ "$(id -u)" -ne 0 ];then
+ echo "SKIP: Need root privileges"
+ exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v ip)" ]; then
+ echo "SKIP: Could not run test without ip tool"
+ exit $ksft_skip
+fi
+
+cleanup &>/dev/null
+
+setup
+
+host_tests
+router_netfilter_tests
+
+print_log_test_results
+
+cleanup &>/dev/null
+
+exit ${ret}