This is hopefully a big no-op unless you're running some extra
patches to flip on A-MSDU options in a driver.
802.11n supports sending A-MSDU in A-MPDU. That lets you do things
like pack small frames into an A-MSDU and stuff /those/ into an A-MPDU.
It allows for much more efficient airtime because you're not
wasting time sending small frames - which is still a problem when
doing A-MPDU as there's still per-frame overhead and minimum A-MPDU
density requirements.
It, however, is optional for 802.11n. A lot of stuff doesn't advertise
it (but does it, just wait!); and I know that ath10k does it and my
ath(4) driver work supports it.
Now, 802.11ac makes A-MSDU in A-MPDU something that can happen more
frequently, because even though you can send very large A-MPDUs
(like 1 megabyte and larger) you still have the small frame problem.
So, 802.11ac NICs like ath10k and iwm will support A-MSDU in A-MPDU
out of the box if it's enabled - and you can negotiate it.
So, let's lay down the ground work to enable A-MSDU in A-MPDU.
This will allow hardware like iwn(4) and ath(4) which supports
software A-MSDU but hardware A-MPDU to be more efficient.
Drivers that support A-MSDU in A-MPDU will set TX/RX htcap flags.
Note this is separate from the software A-MSDU encap path; /that/
dictates whether net80211 is doing A-MSDU encapsulation or not.
These HTC flags control negotiation, NOT encapsulation.
Once this negotiation and driver bits are done, hardware like
rtwn(4), run(4), and others will be able to use A-MSDU even without
A-MPDU working; right now FF and A-MSDU aren't even attempted
if you're an 11n node. It's a small hold-over from the initial
A-MPDU work and I know how to fix it, but to flip it on properly
I need to be able to negotiate or ignore A-MSDU in A-MPDU.
Oh and the fun part - some 11ac APs I've tested will quite happily
decap A-MSDU in A-MPDU even though they don't negotiate it when
doing 802.11n. So hey, I know it works - I just want to properly
handle things. :-)
Tested:
* AR9380, STA/AP mode
The 11b/11g ERP and slot time update handling are two things which weren't
migrated into the per-VAP state when Sam did the initial VAP work.
That makes sense for a lot of setups where net80211 is driving radio state
and the radio only cares about the shared state.
However, as noted by a now deleted comment, the ERP and slot time updates
aren't EXACTLY correct/accurate - they only take into account the most
RECENTLY created VAP, and the state updates when one creates/destroys
VAPs isn't exactly great.
So:
* track the short slot logic per VAP;
* whenever the slot time configuration changes, just push it into a deferred
task queue update so drivers don't have to serialise it themselves;
* if a driver registers a per-VAP slot time handler then it'll just get the
per VAP one;
* .. if a driver registers a global one then the legacy behaviour is maintained -
a single slot time is calculated and pushed out.
Note that the calculated slot time is better than the existing logic - if ANY
of the VAPs require long slot then it's disabled for all VAPs rather than
whatever the last configured VAP did.
Now, this isn't entirely complete - the rest of ERP tracking around short/long
slot capable station tracking needs to be converted into per-VAP, as well
as the preamble/barker flags. Luckily those also can be done in a similar
fashion - keep per-VAP counters/flags and unify them before doing the driver
update. I'll defer that work until later.
All the existing drivers can keep doing what they're doing with the global
slot time flags as that is maintained. One driver (iwi) used the per-VAP
flags instead of the ic flags, so now that driver will work properly.
This unblocks some ath10k porting work as the firmware takes the slot time
configuration per-VAP rather than globally, and some firmware handles
STA+AP and STA+STA (on same/different channels) configurations where
the firmware will switch slot time as appropriate.
Tested:
* AR9380, STA/AP mode
* AR9880 (ath10k), STA mode
net80211 currently doesn't negotiate A-MSDU in A-MPDU during ADDBA.
I've added the field in net80211 and this commit:
* Prints out the ADDBA field value during ADDBA;
* Adds some comments around where I need to follow up with some
negotiation logic.
Right now we don't have a driver flag anywhere which controls
whether A-MSDU in A-MPDU is allowed. I know it works (I have it
manually turned on at home on a couple test APs, heh!) but
I can't flip it on until we can negotiate it.
Tested:
* AR9380, STA/AP mode, printing out ADDBA requests
Now that I have A-MSDU and A-MPDU coexisting together, we need to actually
announce if (a) it's permitted and (b) figure out if we should use it
when transmitting.
This just adds the field; it doesn't yet include it in ADDBA exchanges.
I'm trying to chase down more weird "I am not doing an incremental scan
when being asked" issues so these debugging statements help.
Notably, I've added more debugging around reasons why the scan is skipped -
eg because the cache is considered hot.
This should be a no-op unless you care about the debugging output!
This sends a probe request after IBSS node discovery through
beacon frames. This allows things like HT and VHT capabilities
to be "negotiated" in adhoc mode.
It is .. kinda fire and pray - this isn't retried after discovery
so it's quite possible that nodes occasionally don't come up with
HT/VHT rate upgrades. At some point it may be a fun side project
to add support for retrying these probe requests/negotiations
after IBSS node discovery.
Tested:
* tested with multiple ath(4) NICs in 11n mode.
Differential Revision: https://reviews.freebsd.org/D24979
The scan task refactoring stuff circa 2014-2016 broke the blocking task
into a taskqueue with some async bits, but it apparently broke scans
being interrupted by traffic.
Notably - the new "field" SCAN_PAUSE sets both SCAN_INTERRUPT and SCAN_CANCEL,
and a bunch of existing code was checking for SCAN_CANCEL only and breaking
the scan. Unfortunately it was then (a) cancelling the scan entirely and
(b) not notifying userland that scan was done.
So:
* Update the calls to scan_end() to only pass in 1 (saying the scan is complete)
if SCAN_CANCEL is set WITHOUT SCAN_INTERRUPT. If both are set then yes,
the scan is interrupted, but it isn't canceled - it's just paused.
* Update the "did the scan flags change whilst the driver was called" logic
to check for canceled scans, not interrupted scans.
* The "scan done" logic now explicitly checks for either interrupted or
completed scans. This accounts for the situation where a scan is being
aborted via traffic but it ALSO happens to have finished (ie the last
channel was checked.)
This doesn't ENTIRELY fix scanning as the resume function is broken
due to incorrect ticks math. Thus, the second half of this patch
changes the ieee80211_ticks_*() macros to use int instead of long,
matching the logic that the TCP code does with ticks and handles
wrapping / negative ticks values. If cast to long then the wrapping
math wouldn't work right (ie, if ticks was actually negative,
ie, after the system has been up for a while.)
This allows contbgscan() to correctly calculate if a scan should
continue based on ticks and ic->ic_lastdata .
Reviewed by: bz
Differential Revision: https://reviews.freebsd.org/D25031
This is useful when a wireless driver is stopped or started in response
to events like an RF Kill button press. Applications like
wpa_supplicant depend on such events to have a correct view of interface
state.
Reviewed by: adrian, cy, melifaro
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D24925
I'm still not sure whether this is the full solution, but here goes.
I have a two node DWDS setup - a main AP with the ethernet bridge uplink
and a satellite AP in the back of the house. They're both AR9344+AR9580
dual band 11n APs.
The problem was that multicast frames was not going from the DWDS AP to
the DWDS STA. Unicast frames are fine, and multicast frames from the
DWDS STA to AP are fine.
Now, multicast and unicast frames from the STA -> AP are just transmitted
using the unicast key. That's fine. However, the AP -> STA multicast
frames by default are transmitted using the current default / multicast
key, the shared one between all STAs in a BSS. Now, the DWDS implementation
ignores non WDS frames - it only allows about 4 address frames outside
of management / EAPOL frames! - so the STA side ignores the normal multicast
frames.
Instead, the AP side uses ieee80211_dwds_mcast() to send multicast frames
to each WDS VAP that was created as part of the "dynamic" part of DWDS.
This should be queuing them individually to each node instead of using
the normal multicast send path; and this is how they should get turned into
4-addr WDS frames.
HOWEVER, ieee80211_encap() was trying to use the default TX key to queue
them rather than the unicast key that's already setup. Since this synthetic
node doesn't have the default TX key setup, transmission fails. Things
would be fine in WEP and in open mode because in both cases you would
have static keys (or no keys) setup. It just fails in WPA mode.
This resolves the issue. AP DWDS multicast is now sent using the unicast
key just like in STA mode and I'm pretty sure the STA mode side will stil
work fine (as it's a STA VAP with a DWDS flag..)
Tested:
* TL-WDR3600/4300 APs
IEEE80211_MESH_RTCMD_ADD was invoking memcmp() to validate the
supplied address directly on the user pointer rather than first doing
a copyin() and validating the copied value.
IEEE80211_MESH_RTCMD_DELETE was passing the user pointer directly to
ieee80211_mesh_rt_del() rather than copying the user buffer into a
temporary kernel buffer.
Reviewed by: brooks, kib
Obtained from: CheriBSD
MFC after: 2 weeks
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D24562
This pattern is used in callbacks with void * data arguments and seems
both relatively uncommon and relatively harmless. Silence the warning
by casting through uintptr_t.
This warning is on by default in Clang 11.
Reviewed by: arichardson
Obtained from: CheriBSD (partial)
MFC after: 1 week
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D24425
r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are
still not MPSAFE (or already are but aren’t properly marked).
Use it in preparation for a general review of all nodes.
This is non-functional change that adds annotations to SYSCTL_NODE and
SYSCTL_PROC nodes using one of the soon-to-be-required flags.
Mark all low hanging fruits as MPSAFE.
Reviewed by: markj
Approved by: kib (mentor, blanket)
Differential Revision: https://reviews.freebsd.org/D23626
This makes amrr_node_stats() cleaner and allows the rate printing to be
reusable.
Submitted by: Neel Chauhan <neel at neelc.org>
Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D22318
misunderstanding that the function does not work additive
when repeatedly called for diffferent bands.
Reviewed by: avos (a few months ago)
MFC after: 2 weeks
- Perform ifp mismatch checks (to determine if a send tag is allocated
for a different ifp than the one the packet is being output on), in
ip_output() and ip6_output(). This avoids sending packets with send
tags to ifnet drivers that don't support send tags.
Since we are now checking for ifp mismatches before invoking
if_output, we can now try to allocate a new tag before invoking
if_output sending the original packet on the new tag if allocation
succeeds.
To avoid code duplication for the fragment and unfragmented cases,
add ip_output_send() and ip6_output_send() as wrappers around
if_output and nd6_output_ifp, respectively. All of the logic for
setting send tags and dealing with send tag-related errors is done
in these wrapper functions.
For pseudo interfaces that wrap other network interfaces (vlan and
lagg), wrapper send tags are now allocated so that ip*_output see
the wrapper ifp as the ifp in the send tag. The if_transmit
routines rewrite the send tags after performing an ifp mismatch
check. If an ifp mismatch is detected, the transmit routines fail
with EAGAIN.
- To provide clearer life cycle management of send tags, especially
in the presence of vlan and lagg wrapper tags, add a reference count
to send tags managed via m_snd_tag_ref() and m_snd_tag_rele().
Provide a helper function (m_snd_tag_init()) for use by drivers
supporting send tags. m_snd_tag_init() takes care of the if_ref
on the ifp meaning that code alloating send tags via if_snd_tag_alloc
no longer has to manage that manually. Similarly, m_snd_tag_rele
drops the refcount on the ifp after invoking if_snd_tag_free when
the last reference to a send tag is dropped.
This also closes use after free races if there are pending packets in
driver tx rings after the socket is closed (e.g. from tcpdrop).
In order for m_free to work reliably, add a new CSUM_SND_TAG flag in
csum_flags to indicate 'snd_tag' is set (rather than 'rcvif').
Drivers now also check this flag instead of checking snd_tag against
NULL. This avoids false positive matches when a forwarded packet
has a non-NULL rcvif that was treated as a send tag.
- cxgbe was relying on snd_tag_free being called when the inp was
detached so that it could kick the firmware to flush any pending
work on the flow. This is because the driver doesn't require ACK
messages from the firmware for every request, but instead does a
kind of manual interrupt coalescing by only setting a flag to
request a completion on a subset of requests. If all of the
in-flight requests don't have the flag when the tag is detached from
the inp, the flow might never return the credits. The current
snd_tag_free command issues a flush command to force the credits to
return. However, the credit return is what also frees the mbufs,
and since those mbufs now hold references on the tag, this meant
that snd_tag_free would never be called.
To fix, explicitly drop the mbuf's reference on the snd tag when the
mbuf is queued in the firmware work queue. This means that once the
inp's reference on the tag goes away and all in-flight mbufs have
been queued to the firmware, tag's refcount will drop to zero and
snd_tag_free will kick in and send the flush request. Note that we
need to avoid doing this in the middle of ethofld_tx(), so the
driver grabs a temporary reference on the tag around that loop to
defer the free to the end of the function in case it sends the last
mbuf to the queue after the inp has dropped its reference on the
tag.
- mlx5 preallocates send tags and was using the ifp pointer even when
the send tag wasn't in use. Explicitly use the ifp from other data
structures instead.
- Sprinkle some assertions in various places to assert that received
packets don't have a send tag, and that other places that overwrite
rcvif (e.g. 802.11 transmit) don't clobber a send tag pointer.
Reviewed by: gallatin, hselasky, rgrimes, ae
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D20117
Update node flags when driver supports SMPS, not when it is disabled or
in dynamic mode ((iv_htcaps & HTCAP_SMPS) != 0).
Checked with RTL8188EE (1T1R), STA mode - 'smps' word should disappear
from 'ifconfig wlan0' output.
MFC after: 2 weeks
That should shorten 'ifconfig <wlan> list txparam' output since
unsupported modes will not be shown.
Checked with RTL8188EE, STA mode.
MFC after: 2 weeks
Do not try to clear 'basic rate' bit from roamRate; it cannot be here and,
actually, this operation clears 'MCS rate' bit instead, breaking comparison
for 11n / 11ac modes.
Tested with RTL8188CUS, HOSTAP mode + RTL8821AU, STA mode.
MFC after: 3 days
ifconfig(8) prints per-mode parameters if they are non-zero; since
we have 13 possible modes with 3...5 typically supported this change
should greatly reduce amount of information for 'ifconfig <wlan> list roam'
command.
While here ensure that sta_roam_check() will not use roaming parameters
for unsupported modes (it should not).
This change effectively reverts r188776.
MFC after: 2 weeks
Wrap ieee80211_add_channel_list_2ghz into another function
which supplies default (1-14) channel list to it and drop
its copies from drivers.
Checked with RTL8188EE, country US / JP / KR / UA.
MFC after: 2 weeks
Replace in-place implementation with system-wide one; since it
guarantees non-zero result drop all less-than-one checks from
drivers and net80211.
MFC after: 2 weeks
There is may be only 11b channel (since chanflags[] table
maps MODE_AUTO to the corresponding 11b channel flags).
Checked with RTL8812AU, STA mode.
MFC after: 5 days
Change the way how channel list mode <-> desired mode match is done:
- Match channel list mode for next non-auto desired modes:
* 11b: 11g, 11ng, 11acg;
* 11a: 11na, 11ac
- Add pre-defined channels only when one of the next conditions met:
* the desired channel mode is 'auto' or
* the desired channel and selected channel list modes are exactly
the same or
* the previous rule (11g / 11n / 11ac promotion) applies.
Before r275875 construction work properly for all except
11ng / 11na / 11acg / 11ac modes - these were broken at all
(i.e., the scan list was empty); after r275875 all checks were removed,
so scan table was populated by all device-compatible channels
(desired mode was ignored).
For example, if I will set 'ifconfig wlan0 mode 11ng' for RTL8821AU:
- pre-r275875: nothing, scan will not work;
- after r275875: both 11ng and 11na bands were scanned; also, since 11b
channel list was used, 14th channel was scanned too.
- after this change: only 11ng - 1-13 channels - are used for scanning.
Tested with:
* RTL8188EE, STA mode.
* RTL8821AU, STA mode.
MFC after: 5 days
Since r287197 ieee80211com is a part of drivers softc; as a result,
after detach all pointers to it (iv_ic, ni_ic) are invalid. Most
possible users (tasks, interrupt handlers) are blocked / removed
when device is stopped; however, ioctl handlers were not tracked
and may crash if ieee80211com structure is accessed.
Since ieee80211com pointer access from ieee80211vap structure is not
protected by lock (constant after interface creation) and used in
many other places just use reference counting for ioctl handlers;
on detach set 'detached' flag and wait until reference counter goes to 0.
For HEAD ieee80211vap size was changed (__FreeBSD_version bumped);
however, in stable branches I'm going to split / reuse the last
iv_spare field for KBI stability.
Tested with:
- rsu(4), SIOCSIFCAP (-rxcsum) ioctl;
- rtwn_pci(4), SIOCG80211 / IEEE80211_IOC_HTPROTMODE ioctl.
MFC after: 1 week
For most wireless drivers Rx mbuf is allocated as one
contiguous chunk; only few are using chains for allocations -
but even then at least MCLBYTES (minus Rx descriptor size) is
available in the first mbuf.
In addition to the above, m_pullup was never called here - otherwise,
reallocation will break post-crypto_decap logic (ieee80211_decap,
ieee80211_deliver_data...), so just remove it; length check is left
in case if some truncated frame appears here.
PR: 234241
MFC after: 1 week
There may be various side effects (device timeout, firmware and / or
kernel panic) when an invalid (or inapplicable - e.g., an MCS rate
for 11g-only device) is set; check rates before sending the frame to
the driver.
How-to-reproduce:
Set an MCS (real or bogus - with 0x80 bit set) rate in ibp_rate0 field
for any device that uses ieee80211_isratevalid() for rate checks -
rum(4), run(4), ural(4), bwi(4) or ral(4); if kernel is compiled
with INVARIANTS the check will result in "rate %d is basic/mcs?" panic.
Tested with WUSB54GC (rum(4)), AP mode.
MFC after: 1 week
Check if rate control structures were allocated before trying to
access them in various places; this was possible before on
allocation failure (unlikely), but was revealed after r342211
where allocation was deferred.
In case if driver uses wlan_amrr(4) and it is loaded it
is possible to reproduce the panic via
sysctl net.wlan.<number>.rate_stats
(for wlan0 the number will be 0).
Tested with: RTL8188EE, AP mode + RTL8188CUS, STA mode.
MFC after: 3 days
if_dead() is called during device detach - check if interface is
still exists before trying to refresh vap MAC address
(IF_LLADDR will trigger page fault otherwise).
MFC after: 5 days
ieee80211_alloc_node() does not initialize rateset tables; that's not
expected by rate control modules and will result in array access at
index -1 - where ni_essid[] array is located (zeroed at allocation, so
there are no user-visible consequences).
Just delay rate control initialization to the moment, when rateset
tables are initiaziled; nothing will use rates here anyway.
MFC after: 4 days
The comment above ieee80211_ageq_cleanup specifically notes that the queue
is assumed to be empty, and in order to make it so, ieee80211_ageq_drain
must be used.
Submitted by: Augustin Cavalier <waddlesplash@gmail.com>
Obtained from: Haiku (dffc3e235360cd7b71261239ee8507b7d62a1471)
MFC after: 1 week
As the comment says, ifdetach might be called during the course of driver
detach if initialization failed. This shouldn't be a total failure, though,
we just have nothing to do there.
This has been modified slightly from Augustin's original commit to move the
bail-out slightly earlier since the ic wouldn't have been added to the
ic list in the first place, and a comment has been added describing when
this might be an issue.
Submitted by: Augustin Cavalier <waddlesplash@gmail.com>
Obtained from: Haiku (e6f6c1b4633532a8ad37c803dc7c65601e5b24ba)
This fixes 32-bit compat (no ioctl command defintions are required
as struct ifreq is the same size). This is believed to be sufficent to
fully support ifconfig on 32-bit systems.
Reviewed by: kib
Obtained from: CheriBSD
MFC after: 1 week
Relnotes: yes
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D14900
Move copy-pasted code for RTS/CTS frame allocation into net80211.
While here, add stat / debug message for allocation failures
(copied from run(4)) + return error here in bwn(4).
Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D14628
- Add some basic checks for i_fc* bits (ToDS, FromDS, MoreFrag, Protected);
those are used / checked across various places in Tx path.
- Mark injected 802.11 frame as encapsulated (just as it should be).
- Classify 802.11 frame in a proper way (extract ether_type from LLC header
for Data frames, use AC_BE queue for others (NoData / Management / Control).
- Subtract header length from tx_bytes statistics (so it will correspond
to the comment).
Was checked with RTL8188EU (AP) + Intel 6205 (STA).
Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D13161
Select proper mode when node can do VHT.
Currently there are no drivers with VHT support in the tree,
so this should be noop.
Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D9806
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.
The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
No functional change intended.