[B.A.T.M.A.N.] batman-adv and/or batmand porting effort to FreeBSD
by Mahdi Mokhtari
Hi,
After some time of playing with the B.A.T.M.A.N protocol and
net-interface on OpenWRT and Debian I was thinking to use it with
the servers I use everyday (and maybe on routers/appliances I have
nanoBSD on).
So I started an effort...
(As a background) I already ported some applications to FreeBSD [and I'm
maintaining them] and
also I did work already on the Linux emulation layer of FreeBSD (FreeBSD
has a Linux syscall-emulation and Linux-KPI layers).
So my approach (as naturally I didn't expect the build of batman-adv.ko
to be successful as is),
was based on the approach that we [at FreeBSD] did to port Linux's
drm... <https://github.com/FreeBSDDesktop/kms-drm>
I ended up in adding some header-files to FreeBSD Linux-KPI (like
average.h, percpu.h, ...).
Now I'm at a state that Netlink blocks me and I'm to determine next step :-)
[Which I don't assume it being trivial with my current approach]
So I'd like to ask:
1- Is it better approach to "rewrite" batman-adv.ko [at least
Netlink-ish (let's call "Linuxism") parts] than what I'm doing now?
2- Any other efforts are being done out there?
3- is batmand deprecated [So I should mainly focus on batman-adv.ko]?
4- any other comments do you have? :D
P.S. sorry if I'm not really good at starting conversation from scratch
and out-of-nowhere :D
but I hope by continuing the collaboration we can have better (more
enriched) FreeBSD and better (as in more portable) B.A.T.M.A.N :-)
--
Best regards, MMokhi.
2 years, 4 months
[B.A.T.M.A.N.] [PATCH v5 0/7] B.A.T.M.A.N. V - fallback to tp meter estimation if throughput otherwise not available
by Marek Lindner
Under normal circumstances B.A.T.M.A.N. V retrieves the neighbor
throughput values to populate its metric tables from the various
drivers such as WiFi throughput tables and Ethernet throughput..
Whenever the interface drivers do not export link throughput
information manual overrides become necessary. To further
automate and thus better support these setups, ELP may call the
batman-adv throughput meter to schedule a throughput estimation
to be used to populate the metric table.
v5:
* fix tp_vars refcount on queue_work() failure
* squash batadv_tp_start_work() into batadv_tp_start()
v4:
* read tp measurement result only once
v3:
* fix ELP tp meter result computation
* use batadv_has_timed_out() instead of custom implementation
* set ELP tp meter test duration to 1000ms in patch #6
* add comment explaining periodic scheduling
v2:
* added sysfs attribute to configure tp meter test duration
* fixed null pointer dereference in TP meter packet sending routine
* fixed storing the measured throughput in the correct variable
* checkpatch/kerneldoc/sparse/smatch cleanup
Antonio Quartulli (3):
batman-adv: tp_meter - prevent concurrent tp_meter sessions by using
workqueue
batman-adv: tp_meter - don't check for existing session
batman-adv: tp_meter - add option to perform one-hop test
Marek Lindner (4):
batman-adv: tp_meter - allow up to 10 queued sessions
batman-adv: tp_meter - add caller distinction
batman-adv: ELP - use tp meter to estimate the throughput if otherwise
not available
batman-adv: ELP - add throughput meter test duration attribute
.../ABI/testing/sysfs-class-net-batman-adv | 7 +
include/uapi/linux/batadv_packet.h | 2 +
net/batman-adv/bat_v.c | 1 +
net/batman-adv/bat_v_elp.c | 69 ++-
net/batman-adv/bat_v_elp.h | 21 +
net/batman-adv/main.c | 10 +-
net/batman-adv/main.h | 7 +-
net/batman-adv/netlink.c | 3 +-
net/batman-adv/routing.c | 6 +-
net/batman-adv/sysfs.c | 3 +
net/batman-adv/tp_meter.c | 484 +++++++++++-------
net/batman-adv/tp_meter.h | 11 +-
net/batman-adv/types.h | 36 ++
13 files changed, 453 insertions(+), 207 deletions(-)
--
2.18.0
2 years, 5 months
[PATCH] batman-adv: Axe 'aggr_list_lock'
by Christophe JAILLET
'aggr_list.lock' can safely be used in place of another explicit spinlock
when access to 'aggr_list' has to be guarded.
This avoids to take 2 locks, knowing that the 2nd one is always successful.
Now that the 'aggr_list.lock' is handled explicitly, the lock-free
__sbk_something() variants should be used when dealing with 'aggr_list'.
Signed-off-by: Christophe JAILLET <christophe.jaillet(a)wanadoo.fr>
---
Compile tested only.
---
net/batman-adv/bat_v.c | 1 -
net/batman-adv/bat_v_ogm.c | 30 +++++++++++++++---------------
net/batman-adv/types.h | 3 ---
3 files changed, 15 insertions(+), 19 deletions(-)
diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c
index 64054edc2e3c..4ff6cf1ecae7 100644
--- a/net/batman-adv/bat_v.c
+++ b/net/batman-adv/bat_v.c
@@ -1085,7 +1085,6 @@ void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface)
hard_iface->bat_v.aggr_len = 0;
skb_queue_head_init(&hard_iface->bat_v.aggr_list);
- spin_lock_init(&hard_iface->bat_v.aggr_list_lock);
INIT_DELAYED_WORK(&hard_iface->bat_v.aggr_wq,
batadv_v_ogm_aggr_work);
}
diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c
index b841c83d9c3b..c9a00100f199 100644
--- a/net/batman-adv/bat_v_ogm.c
+++ b/net/batman-adv/bat_v_ogm.c
@@ -151,7 +151,7 @@ static unsigned int batadv_v_ogm_len(struct sk_buff *skb)
* @skb: the OGM to check
* @hard_iface: the interface to use to send the OGM
*
- * Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
+ * Caller needs to hold the hard_iface->bat_v.aggr_list.lock.
*
* Return: True, if the given OGMv2 packet still fits, false otherwise.
*/
@@ -162,7 +162,7 @@ static bool batadv_v_ogm_queue_left(struct sk_buff *skb,
BATADV_MAX_AGGREGATION_BYTES);
unsigned int ogm_len = batadv_v_ogm_len(skb);
- lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
+ lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);
return hard_iface->bat_v.aggr_len + ogm_len <= max;
}
@@ -173,13 +173,13 @@ static bool batadv_v_ogm_queue_left(struct sk_buff *skb,
*
* Empties the OGMv2 aggregation queue and frees all the skbs it contained.
*
- * Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
+ * Caller needs to hold the hard_iface->bat_v.aggr_list.lock.
*/
static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface)
{
- lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
+ lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);
- skb_queue_purge(&hard_iface->bat_v.aggr_list);
+ __skb_queue_purge(&hard_iface->bat_v.aggr_list);
hard_iface->bat_v.aggr_len = 0;
}
@@ -192,7 +192,7 @@ static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface)
*
* The aggregation queue is empty after this call.
*
- * Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
+ * Caller needs to hold the hard_iface->bat_v.aggr_list.lock.
*/
static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface)
{
@@ -201,7 +201,7 @@ static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface)
unsigned int ogm_len;
struct sk_buff *skb;
- lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
+ lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);
if (!aggr_len)
return;
@@ -215,7 +215,7 @@ static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface)
skb_reserve(skb_aggr, ETH_HLEN + NET_IP_ALIGN);
skb_reset_network_header(skb_aggr);
- while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list))) {
+ while ((skb = __skb_dequeue(&hard_iface->bat_v.aggr_list))) {
hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb);
ogm_len = batadv_v_ogm_len(skb);
@@ -242,13 +242,13 @@ static void batadv_v_ogm_queue_on_if(struct sk_buff *skb,
return;
}
- spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
+ spin_lock_bh(&hard_iface->bat_v.aggr_list.lock);
if (!batadv_v_ogm_queue_left(skb, hard_iface))
batadv_v_ogm_aggr_send(hard_iface);
hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb);
- skb_queue_tail(&hard_iface->bat_v.aggr_list, skb);
- spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
+ __skb_queue_tail(&hard_iface->bat_v.aggr_list, skb);
+ spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock);
}
/**
@@ -373,9 +373,9 @@ void batadv_v_ogm_aggr_work(struct work_struct *work)
batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work);
hard_iface = container_of(batv, struct batadv_hard_iface, bat_v);
- spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
+ spin_lock_bh(&hard_iface->bat_v.aggr_list.lock);
batadv_v_ogm_aggr_send(hard_iface);
- spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
+ spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock);
batadv_v_ogm_start_queue_timer(hard_iface);
}
@@ -406,9 +406,9 @@ void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
{
cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq);
- spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
+ spin_lock_bh(&hard_iface->bat_v.aggr_list.lock);
batadv_v_ogm_aggr_list_free(hard_iface);
- spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
+ spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock);
}
/**
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index be7c02aa91e2..75a72d6676ec 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -126,9 +126,6 @@ struct batadv_hard_iface_bat_v {
/** @aggr_len: size of the OGM aggregate (excluding ethernet header) */
unsigned int aggr_len;
- /** @aggr_list_lock: protects aggr_list */
- spinlock_t aggr_list_lock;
-
/**
* @throughput_override: throughput override to disable link
* auto-detection
--
2.20.1
2 years, 6 months
[PATCH] batman-adv: Simplify 'batadv_v_ogm_aggr_list_free()'
by Christophe JAILLET
Use 'skb_queue_purge()' instead of re-implementing it.
Signed-off-by: Christophe JAILLET <christophe.jaillet(a)wanadoo.fr>
---
BTW, I don't really see the need of 'aggr_list_lock'. I think that the code
could be refactored to drop 'aggr_list_lock' and use the already existing
'aggr_list.lock'.
This would require to use the lock-free __skb_... variants when working on
'aggr_list'.
As far as I understand, the use of 'aggr_list' and 'aggr_list_lock' is
limited to bat_v_ogm.c'. So the impact would be limited.
This would avoid a useless locking that never fails, so the performance
gain should be really limited.
So, I'm not sure this would be more readable and/or future proof, so
I just note it here to open the discussion.
If interested, I have a (compiled tested only) patch that implements this
change.
---
net/batman-adv/bat_v_ogm.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c
index dc4f7430cb5a..b841c83d9c3b 100644
--- a/net/batman-adv/bat_v_ogm.c
+++ b/net/batman-adv/bat_v_ogm.c
@@ -177,13 +177,9 @@ static bool batadv_v_ogm_queue_left(struct sk_buff *skb,
*/
static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface)
{
- struct sk_buff *skb;
-
lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
- while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list)))
- kfree_skb(skb);
-
+ skb_queue_purge(&hard_iface->bat_v.aggr_list);
hard_iface->bat_v.aggr_len = 0;
}
--
2.20.1
2 years, 6 months
[PATCH 0/2] pull request for net: batman-adv 2019-10-25
by Simon Wunderlich
Hi David,
here are two bugfixes which we would like to have integrated into net.
Please pull or let me know of any problem!
Thank you,
Simon
The following changes since commit 54ecb8f7028c5eb3d740bb82b0f1d90f2df63c5c:
Linux 5.4-rc1 (2019-09-30 10:35:40 -0700)
are available in the Git repository at:
git://git.open-mesh.org/linux-merge.git tags/batadv-net-for-davem-20191025
for you to fetch changes up to 40e220b4218bb3d278e5e8cc04ccdfd1c7ff8307:
batman-adv: Avoid free/alloc race when handling OGM buffer (2019-10-13 21:00:07 +0200)
----------------------------------------------------------------
Here are two batman-adv bugfixes:
* Fix free/alloc race for OGM and OGMv2, by Sven Eckelmann (2 patches)
----------------------------------------------------------------
Sven Eckelmann (2):
batman-adv: Avoid free/alloc race when handling OGM2 buffer
batman-adv: Avoid free/alloc race when handling OGM buffer
net/batman-adv/bat_iv_ogm.c | 61 +++++++++++++++++++++++++++++++++++------
net/batman-adv/bat_v_ogm.c | 41 +++++++++++++++++++++------
net/batman-adv/hard-interface.c | 2 ++
net/batman-adv/types.h | 7 +++++
4 files changed, 94 insertions(+), 17 deletions(-)
2 years, 6 months
general protection fault in batadv_iv_ogm_queue_add
by syzbot
Hello,
syzbot found the following crash on:
HEAD commit: 998d7551 Merge branch 'akpm' (patches from Andrew)
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1702db87600000
kernel config: https://syzkaller.appspot.com/x/.config?x=e0ac4d9b35046343
dashboard link: https://syzkaller.appspot.com/bug?extid=7dd2da51d8ae6f990403
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7dd2da51d8ae6f990403(a)syzkaller.appspotmail.com
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4256 Comm: kworker/u4:0 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:batadv_iv_ogm_queue_add+0x49/0x1120
net/batman-adv/bat_iv_ogm.c:605
Code: 48 89 75 b8 48 89 4d c0 4c 89 45 b0 44 89 4d d0 e8 fc 02 46 fa 48 8d
7b 03 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 18 0d 00 00
RSP: 0018:ffff88805d2cfb80 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888092284000
RDX: 0000000000000000 RSI: ffffffff872d1214 RDI: 0000000000000003
RBP: ffff88805d2cfc18 R08: ffff888092284000 R09: 0000000000000001
R10: ffffed100ba59f77 R11: 0000000000000003 R12: dffffc0000000000
R13: ffffed101245080e R14: ffff888092284000 R15: 0000000100051cf6
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200002c0 CR3: 00000000a421b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
batadv_iv_ogm_schedule+0xb0b/0xe50 net/batman-adv/bat_iv_ogm.c:813
batadv_iv_send_outstanding_bat_ogm_packet+0x580/0x760
net/batman-adv/bat_iv_ogm.c:1675
process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 04d065842187c2b8 ]---
RIP: 0010:batadv_iv_ogm_queue_add+0x49/0x1120
net/batman-adv/bat_iv_ogm.c:605
Code: 48 89 75 b8 48 89 4d c0 4c 89 45 b0 44 89 4d d0 e8 fc 02 46 fa 48 8d
7b 03 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 18 0d 00 00
RSP: 0018:ffff88805d2cfb80 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888092284000
RDX: 0000000000000000 RSI: ffffffff872d1214 RDI: 0000000000000003
RBP: ffff88805d2cfc18 R08: ffff888092284000 R09: 0000000000000001
R10: ffffed100ba59f77 R11: 0000000000000003 R12: dffffc0000000000
R13: ffffed101245080e R14: ffff888092284000 R15: 0000000100051cf6
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200002c0 CR3: 00000000a421b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller(a)googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
2 years, 6 months
Batman-adv behind bridge to wireless?
by dan
I'm considering a certain deployment model here and wanted to get some
expert input.
The design would be
-batman-adv router (could be raspberry pi, or pcengines, etc)
-1,2,3 etc complete radio devices doing 802.11s or dynamic WDS etc
with that radio interface bridged to an ethernet port connected to the
batman-adv router.
This might be called 'radio on a stick'.
an example might be
2 mikrotik omnitik ac devices on different channels, each with their
5Ghz radio configured as ap-bridge with dynamic WDS, those WDS
interfaces would be bridged with horizon (to eliminate loops) and 1
ethernet interface w/o horizon. Those interfaces would connect to the
batman-adv router.
mikrotik has an hwmp based mesh, but it's primitive and I don't want
nodes responding to other nodes in that mesh, I want batman-adv magic
in the mix. I might utilize this interface but with a 1 hop limit so
it works a lot like a horizon bridge without using horizon.
this design appears as ptp links plugged into a switch and has no
opportunity for loops. Each batman-adv router can broadcast and each
other batman-adv will receive that through the bridge because it
doesn't have horizon set, but the A and C devices that are 'bridged'
by B can't because those interfaces share horizon on B, or the hop
limit depending on the interface used. I'm thinking that solves any
issues batman-adv might have with putting the 'switch/hub' of sorts in
the middle.
One thing I'm trying to solve here is the classic single radio mesh
issue of halves bandwidth, as well as having link health in the mix
without taking an interface offline. I'd rather have 2% packet loss
on an interface that have 100% packet loss.
additionally, this is for a hybrid mesh design where there is a ~50
node mesh with 2-3 backhauls to a mesh entry point on a tower, and
then likely a 'midspan' link or two with high capacity radios to
reduce hop count.
finally, this allows me to use off-the-shelf devices with pole mounts
etc for this while running the batman-adv router on the ground in an
appropriate container. A raspberry pi4 would be a great router for
this and I could use VLANs up the feed ethernet link.
Thoughts?
2 years, 7 months
