[src/netbsd-9]: src Pull up following revision(s) (requested by yamaguchi in ...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/505c20bd34b8
branches:  netbsd-9
changeset: 461021:505c20bd34b8
user:      martin <martin%NetBSD.org@localhost>
date:      Wed Nov 13 12:50:30 2019 +0000

description:
Pull up following revision(s) (requested by yamaguchi in ticket #420):

        sys/net/if_vlan.c: revision 1.148
        tests/net/if_vlan/t_vlan.sh: revision 1.16

Fix a bug that vlan(4) fragments IPv6 packets
even the MTU > packet length.

The bug is appeared when the mtu is increased on SIOCSETVLAN.
>From t-kusaba@IIJ

atf: add test cases for MTU that is increased on SIOCSETVLAN
>From t-kusaba@IIJ, thanks

diffstat:

 sys/net/if_vlan.c           |   11 ++-
 tests/net/if_vlan/t_vlan.sh |  135 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 141 insertions(+), 5 deletions(-)

diffs (210 lines):

diff -r a1745755cbfe -r 505c20bd34b8 sys/net/if_vlan.c
--- a/sys/net/if_vlan.c Tue Nov 12 18:25:33 2019 +0000
+++ b/sys/net/if_vlan.c Wed Nov 13 12:50:30 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_vlan.c,v 1.141.2.2 2019/10/23 19:28:49 martin Exp $ */
+/*     $NetBSD: if_vlan.c,v 1.141.2.3 2019/11/13 12:50:30 martin Exp $ */
 
 /*
  * Copyright (c) 2000, 2001 The NetBSD Foundation, Inc.
@@ -78,7 +78,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_vlan.c,v 1.141.2.2 2019/10/23 19:28:49 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_vlan.c,v 1.141.2.3 2019/11/13 12:50:30 martin Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -119,6 +119,7 @@
 #ifdef INET6
 #include <netinet6/in6_ifattach.h>
 #include <netinet6/in6_var.h>
+#include <netinet6/nd6.h>
 #endif
 
 #include "ioconf.h"
@@ -540,6 +541,12 @@
        nmib->ifvm_p = p;
        nmib->ifvm_tag = vid;
        ifv->ifv_if.if_mtu = p->if_mtu - nmib->ifvm_mtufudge;
+#ifdef INET6
+       KERNEL_LOCK_UNLESS_NET_MPSAFE();
+       if (in6_present)
+               nd6_setmtu(ifp);
+       KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
+#endif
        ifv->ifv_if.if_flags = p->if_flags &
            (IFF_UP | IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
 
diff -r a1745755cbfe -r 505c20bd34b8 tests/net/if_vlan/t_vlan.sh
--- a/tests/net/if_vlan/t_vlan.sh       Tue Nov 12 18:25:33 2019 +0000
+++ b/tests/net/if_vlan/t_vlan.sh       Wed Nov 13 12:50:30 2019 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: t_vlan.sh,v 1.15 2018/12/11 03:47:51 ozaki-r Exp $
+#      $NetBSD: t_vlan.sh,v 1.15.2.1 2019/11/13 12:50:30 martin Exp $
 #
 # Copyright (c) 2016 Internet Initiative Japan Inc.
 # All rights reserved.
@@ -33,9 +33,9 @@
 IP_REMOTE0=10.0.0.2
 IP_REMOTE1=10.0.1.2
 IP_MCADDR0=224.0.0.10
-IP6_LOCAL0=fc00:0::1
+IP6_LOCAL0=fc00::1
 IP6_LOCAL1=fc00:1::1
-IP6_REMOTE0=fc00:0::2
+IP6_REMOTE0=fc00::2
 IP6_REMOTE1=fc00:1::2
 IP6_MCADDR0=ff11::10
 ETH_IP_MCADDR0=01:00:5e:00:00:0a
@@ -255,6 +255,133 @@
        cleanup
 }
 
+vlan_auto_follow_mtu_body_common()
+{
+       local atf_ifconfig="atf_check -s exit:0 rump.ifconfig"
+       local outfile=./out
+       local af=inet
+       local prefix=24
+       local local0=$IP_LOCAL0
+       local remote0=$IP_REMOTE0
+       local ping_cmd="rump.ping -D -n -w 1 -c 1"
+       local mtu=1500
+       local vlan_mtu=`expr $mtu - 4`
+       # ipv4 header=20bytes, icmp header=8bytes
+       local padding=`expr $vlan_mtu - 20 - 8`
+       local over_padding=`expr $vlan_mtu - 20 - 8 + 1`
+       local nonfrag_msg="$local0 > $remote0: ICMP echo request"
+       # unused for ipv4
+       local frag_msg=""
+
+       if [ x"$1" = x"inet6" ]; then
+               af="inet6"
+               prefix=64
+               local0=$IP6_LOCAL0
+               remote0=$IP6_REMOTE0
+               # ipv6 header=40bytes, icmpv6 header=8bytes
+               padding=`expr $vlan_mtu - 40 - 8`
+               over_padding=`expr $vlan_mtu - 40 - 8 + 1`
+               ping_cmd="rump.ping6 -mm -n -c 1 -i 1"
+               nonfrag_msg="$local0 > $remote0: ICMP6, echo request"
+               frag_msg="$local0 > $remote0: frag .* ICMP6, echo request"
+       fi
+
+       rump_server_add_iface $SOCK_LOCAL shmif0 $BUS
+       rump_server_add_iface $SOCK_REMOTE shmif0 $BUS
+
+       export RUMP_SERVER=$SOCK_LOCAL
+       $atf_ifconfig shmif0 up
+       export RUMP_SERVER=$SOCK_REMOTE
+       $atf_ifconfig shmif0 up
+
+       export RUMP_SERVER=$SOCK_LOCAL
+       $atf_ifconfig vlan0 create
+
+       # since upper bound of shmif's mtu is 1500,
+       # so we lower vlan's mtu instead of raising shmif's.
+       # to do this, we change the interface's parameter
+       # such as ND_IFINFO(ifp)->maxmtu that is changed by SIOCSIFMTU.
+
+       # $atf_config shmif0 mtu 1600
+       $atf_ifconfig vlan0 vlan 10 vlanif shmif0
+       $atf_ifconfig vlan0 mtu 1400
+       $atf_ifconfig vlan0 -vlanif shmif0
+
+       $atf_ifconfig vlan0 vlan 10 vlanif shmif0
+       $atf_ifconfig vlan0 $af $local0/$prefix
+       $atf_ifconfig vlan0 up
+       $atf_ifconfig -w 10
+
+       export RUMP_SERVER=$SOCK_REMOTE
+       $atf_ifconfig vlan0 create
+       $atf_ifconfig vlan0 vlan 10 vlanif shmif0
+       $atf_ifconfig vlan0 $af $remote0/$prefix
+       $atf_ifconfig vlan0 up
+       $atf_ifconfig -w 10
+
+       extract_new_packets $BUS > $outfile
+       export RUMP_SERVER=$SOCK_LOCAL
+
+       atf_check -s exit:0 -o ignore $ping_cmd -s $padding $remote0
+       extract_new_packets $BUS > $outfile
+       atf_check -s exit:0 -o match:"$nonfrag_msg" cat $outfile
+
+       if [ x"$1" = x"inet6" ]; then
+               atf_check -s exit:0 -o ignore $ping_cmd -s $over_padding $remote0
+               extract_new_packets $BUS > $outfile
+               atf_check -s exit:0 -o match:"$frag_msg" cat $outfile
+       else
+               atf_check -s not-exit:0 -o ignore -e match:"Message too long" \
+                               $ping_cmd -s $over_padding $remote0
+       fi
+}
+
+atf_test_case vlan_auto_follow_mtu cleanup
+vlan_auto_follow_mtu_head()
+{
+
+       atf_set "descr" "tests of setting vlan mtu using IPv4"
+       atf_set "require.progs" "rump_server"
+}
+
+vlan_auto_follow_mtu_body()
+{
+       rump_server_start $SOCK_LOCAL vlan
+       rump_server_start $SOCK_REMOTE vlan
+
+       vlan_auto_follow_mtu_body_common inet
+}
+
+vlan_auto_follow_mtu_cleanup()
+{
+
+       $DEBUG && dump
+       cleanup
+}
+
+atf_test_case vlan_auto_follow_mtu6 cleanup
+vlan_auto_follow_mtu6_head()
+{
+
+       atf_set "descr" "tests of setting vlan mtu using IPv6"
+       atf_set "require.progs" "rump_server"
+}
+
+vlan_auto_follow_mtu6_body()
+{
+       rump_server_start $SOCK_LOCAL vlan netinet6
+       rump_server_start $SOCK_REMOTE vlan netinet6
+
+       vlan_auto_follow_mtu_body_common inet6
+}
+
+vlan_auto_follow_mtu6_cleanup()
+{
+
+       $DEBUG && dump
+       cleanup
+}
+
 vlanid_config_and_ping()
 {
        local atf_ifconfig="atf_check -s exit:0 rump.ifconfig"
@@ -738,6 +865,7 @@
 
        atf_add_test_case vlan_create_destroy
        atf_add_test_case vlan_basic
+       atf_add_test_case vlan_auto_follow_mtu
        atf_add_test_case vlan_vlanid
        atf_add_test_case vlan_configs
        atf_add_test_case vlan_bridge
@@ -745,6 +873,7 @@
 
        atf_add_test_case vlan_create_destroy6
        atf_add_test_case vlan_basic6
+       atf_add_test_case vlan_auto_follow_mtu6
        atf_add_test_case vlan_vlanid6
        atf_add_test_case vlan_configs6
        atf_add_test_case vlan_bridge6