[OpenWrt-Devel] odhcpd problem

[e9hack]

Hi,

I've trouble with this patch:

router: improve code readability
No functional changes; just improve code readabilty in send_router_advert()

I'm using odhcpd a little bit modified. Odhcpd does not provide dhcpv6, but it sends the managed flag that dhcpv6 is
available. Dhcpv6 is done by dnsmasq. I'm using this patch:

--- a/src/router.c	2018-06-26 14:20:53.000000000 +0200
+++ b/src/router.c	2018-07-06 09:45:14.473544050 +0200
@@ -379,12 +379,11 @@
 	if (hlim > 0)
 		adv.h.nd_ra_curhoplimit = hlim;

-	if (iface->dhcpv6) {
+	if (iface->dhcpv6)
 		adv.h.nd_ra_flags_reserved = ND_RA_FLAG_OTHER;

-		if (iface->ra_managed >= RA_MANAGED_MFLAG)
-			adv.h.nd_ra_flags_reserved |= ND_RA_FLAG_MANAGED;
-	}
+	if (iface->ra_managed >= RA_MANAGED_MFLAG)
+		adv.h.nd_ra_flags_reserved |= ND_RA_FLAG_OTHER | ND_RA_FLAG_MANAGED;

 	if (iface->route_preference < 0)
 		adv.h.nd_ra_flags_reserved |= ND_RA_PREF_LOW;

After the code improvement, my Raspberypi's are kicked out from network after a short time. They running headless.
Before this occurs, I can check the dhcpcd status:

pi at raspberrypi:~ $ sudo systemctl status dhcpcd
â dhcpcd.service - dhcpcd on all interfaces
   Loaded: loaded (/lib/systemd/system/dhcpcd.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2019-04-18 21:07:52 CEST; 9h ago
  Process: 380 ExecStart=/usr/lib/dhcpcd5/dhcpcd -q -b (code=exited, status=0/SUCCESS)
 Main PID: 392 (dhcpcd)
      CPU: 20.817s
   CGroup: /system.slice/dhcpcd.service
           ââ392 /sbin/dhcpcd -q -b
           ââ482 wpa_supplicant -B -c/etc/wpa_supplicant/wpa_supplicant.conf -iwlan0 -Dnl80211,wext

Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long
Apr 19 07:05:05 raspberrypi dhcpcd[392]: eth0: dhcp_envoption 31.0/2: Argument list too long

What does this 'eth0: dhcp_envoption 31.0/2: Argument list too long' mean and what is the reason for this?

If they are kicked out, access is not longer possible, even if I revert odhcpd to the previous version and reconnect the
lan cables. I must power off the pi's.

If the pi's are running well, this is the dhcpcd status:

pi at raspberrypi:~ $ sudo systemctl status dhcpcd
â dhcpcd.service - dhcpcd on all interfaces
   Loaded: loaded (/lib/systemd/system/dhcpcd.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2019-04-19 07:29:08 CEST; 14s ago
  Process: 1023 ExecStop=/sbin/dhcpcd -x (code=exited, status=1/FAILURE)
  Process: 1036 ExecStart=/usr/lib/dhcpcd5/dhcpcd -q -b (code=exited, status=0/SUCCESS)
 Main PID: 1038 (dhcpcd)
      CPU: 351ms
   CGroup: /system.slice/dhcpcd.service
           ââ1038 /sbin/dhcpcd -q -b
           ââ1055 wpa_supplicant -B -c/etc/wpa_supplicant/wpa_supplicant.conf -iwlan0 -Dnl80211,wext

Apr 19 07:29:08 raspberrypi dhcpcd[1038]: eth0: Router Advertisement from fe80::xxxx:xxxx:xxxx:xxxx
Apr 19 07:29:08 raspberrypi dhcpcd[1038]: eth0: adding address 2003:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx/64
Apr 19 07:29:08 raspberrypi dhcpcd[1038]: eth0: adding address fde9:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx/64
Apr 19 07:29:08 raspberrypi dhcpcd[1038]: eth0: adding route to 2003:xxxx:xxxx:xxxx::/64
Apr 19 07:29:08 raspberrypi dhcpcd[1038]: eth0: adding route to fde9:xxxx:xxxx:xxxx::/64
Apr 19 07:29:08 raspberrypi dhcpcd[1038]: eth0: adding default route via fe80::xxxx:xxxx:xxxx:xxxx
Apr 19 07:29:08 raspberrypi dhcpcd[1038]: eth0: confirming prior DHCPv6 lease
Apr 19 07:29:09 raspberrypi dhcpcd[1038]: eth0: REPLY6 received from fe80::xxxx:xxxx:xxxx:xxxx
Apr 19 07:29:09 raspberrypi dhcpcd[1038]: eth0: adding address fec0::ffff:0:0:ffff:80/128
Apr 19 07:29:09 raspberrypi dhcpcd[1038]: eth0: renew in 86400, rebind in 151200, expire in 172800 seconds
[1]+  Done                    sudo systemctl restart dhcpcd

Regards,
Hartmut

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