config: support asymmetric links

This change allows both the snr and prob models to have asymmetric
links by configuring both directions.  If only a single direction
is configured, the path will be symmetric as before.

Signed-off-by: Bob Copeland <me@bobcopeland.com>

Only use SUDO_USER if available

If the script is run as sudo, it is more convenient to have the
traffic capture file owned by the sudo user instead of root.

Capture traffic in a separate tmux window

In the last commit I tried to reuse a tmux window to bring up the hwsim0
interface. This is not possible as wmediumd stays running on the foreground.

Instead, create a new tmux window to bring up hwsim0 and capture traffic.

Fix tmux window indexing in diamond.sh

 * Fix bug in session naming
        - tmux new-window -t $session -n $ip
        + tmux new-window -t $session -n $win

 * Support the scenario where tmux indexes windows starting from one
   (set -g base-index 1)

 * Drop the use of -n to name tmux windows.  It is ok to assume
   sequential indexing, which simplifies the code a bit.

Fix rate sets to match to the mac80211_hwsim

Previously, we used set_band() to specify the band of a interface. But
wpa_supplicant could change the band of a interface. So we switch band
dynamically with HWSIM_ATTR_FREQ in the frame information.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

Reporeted-by: Patrick Große <patrick.grosse@wwu.de>
Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

The rate sets of mac80211_hwsim is defined at
drivers/net/wireless/mac80211_hwsim.c#hwsim_rates.
The rate sets includes 12 rates.
But wmediumd rateset defined at per.c includes 8 rates.
To fix the mismatch, this patch fixes the wmediumd rateset.

The additional rates are 11b rates, in spite of the wmediumd calculates
SNR with OFDM rates. So we use parameter of closest OFDM rate.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

Use version v0.3.1 which fixes a number of issues from v0.3[.0]

Signed-off-by: Bob Copeland <me@bobcopeland.com>

Fix some issues

The commit 0bad6d6d "Replace
get_error_prob() with PER file" removed previous
get_error_prob_from_snr(). The previous function used rates defined by
rateset. The rates were [6, 9, 12, 18, 24, 36, 48, 54]. But new PER file
includes 11b rates [1, 2, 5.5, ...]. This patch fixes the PER file and
default PER to use 11a/g rate only and fixes some tests to suite to new
PER table.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

The index_to_rate array could be over run by large index from libnl.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

Deal tx rate more than 54Mbps as error probability 1.0 same as
get_error_prob_from_snr().

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

After commit 112efc50 'drop built-in
PER matrix', wmediumd fails to boot. This patch fixes the issue.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

I had asked for this, but after experimenting a bit I found that
the curves are not very well specified around the transitions which
makes it hard to use this tool for testing rate controllers and
the like.  Restore the analytical PER model.  If we find that the
numbers are too far off from reality, we can consider tweaking the
functions somewhat.

Signed-off-by: Bob Copeland <me@bobcopeland.com>

This reverts commit 0bad6d6d.

Make signal_table_ieee80211ax as default PER value

loglevel 7 is just too much info and reduces tput quite a bit.

Signed-off-by: Bob Copeland <me@bobcopeland.com>

The message "Family MAC80211_HWSIM not registered" was displayed
even though MAC80211_HWSIM module was enabled in the Linux kernel.

I'm using Ubuntu 16.04. With default kernel(linux 4.4), the issue does
not occur. I encountered the issue with linux 4.10. So this looks a bug
in Linux kernel.

This patch can avoid the issue by using family_id instead of struct
genl_family. And this looks faster than calling function at each tx.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

Make signal_table_ieee80211ax as default PER value because almost users
does not use outer PER file.

Remain -x option for a few uses.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

Merge Masashi Honma's wireless models for wmediumd.

gcc complains like so with designated initializers.

wmediumd.c: In function ‘rearm_timer’:
wmediumd.c:125:9: warning: missing initializer for field ‘it_interval’ of ‘struct itimerspec’ [-Wmissing-field-initializers]

Just use a normal memset to silence the warning.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

This is the default error probability parameter.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>