Bug 262183

Summary:	wpa_supplicant on open Wi-Fi: dhclient[2433]: send_packet: No buffer space available
Product:	Base System	Reporter:	Neel Chauhan <nc>
Component:	bin	Assignee:	Cy Schubert <cy>
Status:	Closed FIXED
Severity:	Affects Only Me	CC:	bz, cy, emaste, grahamperrin, rmavella+freebsd
Priority:	---
Version:	CURRENT
Hardware:	Any
OS:	Any

Description Neel Chauhan freebsd_committer

2022-02-25 02:58:09 UTC

When I attempt to use DHCP on hotel Wi-Fis, I get errors like this:

dhclient[2433]: send_packet: No buffer space available

The nature of the issue is that, while I can connect to the open Wi-Fi just fine, wpa_supplicant is successful, I am unable to get a DHCP lease.

I cannot get a DHCP lease on both the built-in dhclient and dhcpcd from ports.

This is happening on a HP Spectre x360 14-ea0023dx running 14-CURRENT 9ad210c1593. This happens on the built-in Intel AX201, and both Realtek and Ralink dongles.

In the past, open hotel Wi-Fi has worked fine on FreeBSD. Also, home Wi-Fi (WPA2, both Netgear Orbi and Huawei) and my Android phone (both Pixel and OnePlus) as a hotspot/repeater works fine.

The hotels are in many parts of the US: Portland, Salt Lake City, Austin, Provo, and small towns, etc, and with many different managers/brands/franchises.

Comment 1 Neel Chauhan freebsd_committer

2022-02-25 03:30:58 UTC

I did some more testing, and it seems to be a wpa_supplicant issue with key_mgmt=NONE.

Using ssid=XXXX in /etc/rc.conf works fine for unencrypted networks.

Comment 2 Cy Schubert freebsd_committer

2022-02-25 19:42:42 UTC

Can you list the entry for the hotel in your wpa_supplicant.conf. Or, the default entry it's using, please.

Comment 3 Cy Schubert freebsd_committer

2022-02-25 20:37:51 UTC

I am unable to reproduce the problem here:

lippy# ifconfig wlan0
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether NNNNNNNNNNNN
	inet6 fe80::XXXXXXXX%wlan0 prefixlen 64 scopeid 0x3
	groups: wlan
	ssid dlink channel 1 (2412 MHz 11g) bssid BBBBBBBBBBBBB
	regdomain FCC country US authmode OPEN privacy OFF txpower 30
	bmiss 10 scanvalid 60 protmode CTS wme roaming MANUAL
	parent interface: iwn0
	media: IEEE 802.11 Wireless Ethernet OFDM/36Mbps mode 11g
	status: associated
	nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
slippy# 

network={
        disabled=0
        priority=100
        key_mgmt=NONE
}

Setting up my main wireless N for open access I can also connect:

wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether NNNNNNNNNNNNNNn
	inet6 fe80::XXXXXXXXXXX%wlan0 prefixlen 64 scopeid 0x3
	groups: wlan
	ssid SSSSSS channel 9 (2452 MHz 11g ht/20) bssid BBBBBBBBBBBBBBBBBB
	regdomain FCC country US authmode WPA privacy MIXED deftxkey UNDEF
	txpower 30 bmiss 10 scanvalid 60 protmode CTS ampdulimit 64k
	ampdudensity 8 -amsdutx amsdurx shortgi -stbc -ldpc -uapsd wme
	roaming MANUAL
	parent interface: iwn0
	media: IEEE 802.11 Wireless Ethernet MCS mode 11ng
	status: associated
	nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>

And bonous, I've been able to connect to a neighbour's open network too.

wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether NNNNNNNNNNNNNNNNN
	inet6 fe80::XXXXXXXXXXXXX%wlan0 prefixlen 64 scopeid 0x3
	groups: wlan
	ssid WiFi_OBDII channel 1 (2412 MHz 11g) bssid BBBBBBBBBBBB
	regdomain FCC country US authmode OPEN privacy OFF txpower 30
	bmiss 10 scanvalid 60 protmode CTS wme roaming MANUAL
	parent interface: iwn0
	media: IEEE 802.11 Wireless Ethernet OFDM/36Mbps mode 11g
	status: associated
	nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>

Can you post the relevant bits of your wpa_supplicant.conf (or email me directly)?

Comment 4 Cy Schubert freebsd_committer

2022-02-25 21:10:49 UTC

Can you also list uname -a, please,specifically the git hash.

Comment 5 Cy Schubert freebsd_committer

2022-04-03 03:45:00 UTC

Is this still a problem?

Comment 6 Ryan Avella 2022-04-05 04:35:00 UTC

I think I may be experiencing the same thing. I can connect to secured networks just fine, but at some coffee shops with unsecured networks I noticed that dhclient doesn't receive any DHCP offers.

I have a ThinkPad T490 running the 13-STABLE branch of HardenedBSD. The NIC is a Intel Wireless-AC 9560.

$ uname -a
FreeBSD hhhhhhhh 13.1-PRERELEASE-HBSD FreeBSD 13.1-PRERELEASE-HBSD #0 : Sat Mar  5 21:24:23 UTC 2022     root@ci-12.md.hardenedbsd.lan:/usr/obj/usr/src/amd64.amd64/sys/HARDENEDBSD  amd64

$ cat /etc/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel

network={
	ssid="my-home-network-ssid"
	key_mgmt=WPA-PSK
	proto=RSN
	psk="xxxxxxxx"
}

network={
	ssid="my-phone's-access-point-ssid"
	key_mgmt=WPA-PSK
	proto=RSN
	psk="xxxxxxxx"
}

network={
	ssid="SSSSSS"
	key_mgmt=NONE
}

$ ifconfig wlan0
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether NN:NN:NN:NN:NN:NN
	inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255
	ssid "SSSSSS" channel 9 (2452 MHz 11g) bssid BB:BB:BB:BB:BB:BB
	regdomain FCC country US authmode WPA privacy MIXED deftxkey UNDEF
	txpower 30 bmiss 10 scanvalid 60 protmode CTS wme roaming MANUAL
	parent interface: iwm0
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
	groups: wlan
	media: IEEE 802.11 Wireless Ethernet OFDM/36Mbps mode 11g
	status: associated

$ sysrc -a | grep wlan0
create_args_wlan0: country US regdomain FCC
if_config_wlan0: WPA DHCP
wlans_iwm0: wlan0

Comment 7 Cy Schubert freebsd_committer

2022-04-14 15:40:11 UTC

This may be related to PR/263266. The patch was committed today. Can you try it now, please.