[PATCH 0/5] pull request for net-next: batman-adv 2023-01-27

[PATCH 0/5] pull request for net-next: batman-adv 2023-01-27

[Simon Wunderlich]

Hi Jakub, hi David,

here is a feature/cleanup pull request of batman-adv to go into net-next.

Please pull or let me know of any problem!

Thank you,
      Simon

The following changes since commit 88603b6dc419445847923fcb7fe5080067a30f98:

  Linux 6.2-rc2 (2023-01-01 13:53:16 -0800)

are available in the Git repository at:

  git://git.open-mesh.org/linux-merge.git tags/batadv-next-pullrequest-20230127

for you to fetch changes up to 0c4061c0d0e2c381ffe4d8b7c62ea69ad8132071:

  batman-adv: tvlv: prepare for tvlv enabled multicast packet type (2023-01-21 19:01:59 +0100)

----------------------------------------------------------------
This feature/cleanup patchset includes the following patches:

 - bump version strings, by Simon Wunderlich

 - drop prandom.h includes, by Sven Eckelmann

 - fix mailing list address, by Sven Eckelmann

 - multicast feature preparation, by Linus Lüssing (2 patches)

----------------------------------------------------------------
Linus Lüssing (2):
      batman-adv: mcast: remove now redundant single ucast forwarding
      batman-adv: tvlv: prepare for tvlv enabled multicast packet type

Simon Wunderlich (1):
      batman-adv: Start new development cycle

Sven Eckelmann (2):
      batman-adv: Drop prandom.h includes
      batman-adv: Fix mailing list address

 Documentation/networking/batman-adv.rst |   2 +-
 include/uapi/linux/batadv_packet.h      |   2 +
 net/batman-adv/bat_iv_ogm.c             |   1 -
 net/batman-adv/bat_v_elp.c              |   1 -
 net/batman-adv/bat_v_ogm.c              |   5 +-
 net/batman-adv/distributed-arp-table.c  |   2 +-
 net/batman-adv/gateway_common.c         |   2 +-
 net/batman-adv/main.h                   |   2 +-
 net/batman-adv/multicast.c              | 251 ++------------------------------
 net/batman-adv/multicast.h              |  38 +----
 net/batman-adv/network-coding.c         |   4 +-
 net/batman-adv/routing.c                |   7 +-
 net/batman-adv/soft-interface.c         |  26 ++--
 net/batman-adv/translation-table.c      |   4 +-
 net/batman-adv/tvlv.c                   |  71 ++++++---
 net/batman-adv/tvlv.h                   |   9 +-
 net/batman-adv/types.h                  |   6 +
 17 files changed, 110 insertions(+), 323 deletions(-)

[PATCH 1/5] batman-adv: Start new development cycle

[Simon Wunderlich]

This version will contain all the (major or even only minor) changes for
Linux 6.3.

The version number isn't a semantic version number with major and minor
information. It is just encoding the year of the expected publishing as
Linux -rc1 and the number of published versions this year (starting at 0).

Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/main.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index c48803b32bb0..156ed39eded1 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -13,7 +13,7 @@
 #define BATADV_DRIVER_DEVICE "batman-adv"
 
 #ifndef BATADV_SOURCE_VERSION
-#define BATADV_SOURCE_VERSION "2022.3"
+#define BATADV_SOURCE_VERSION "2023.1"
 #endif
 
 /* B.A.T.M.A.N. parameters */
-- 
2.30.2

Re: [PATCH 1/5] batman-adv: Start new development cycle

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Simon Wunderlich <sw@simonwunderlich.de>:

On Fri, 27 Jan 2023 11:21:29 +0100 you wrote:
> This version will contain all the (major or even only minor) changes for
> Linux 6.3.
> 
> The version number isn't a semantic version number with major and minor
> information. It is just encoding the year of the expected publishing as
> Linux -rc1 and the number of published versions this year (starting at 0).
> 
> [...]

Here is the summary with links:
  - [1/5] batman-adv: Start new development cycle
    https://git.kernel.org/netdev/net-next/c/55307f51f48e
  - [2/5] batman-adv: Drop prandom.h includes
    https://git.kernel.org/netdev/net-next/c/c4b40f80585c
  - [3/5] batman-adv: Fix mailing list address
    https://git.kernel.org/netdev/net-next/c/8f6bc4583713
  - [4/5] batman-adv: mcast: remove now redundant single ucast forwarding
    https://git.kernel.org/netdev/net-next/c/e7d6127b89a9
  - [5/5] batman-adv: tvlv: prepare for tvlv enabled multicast packet type
    https://git.kernel.org/netdev/net-next/c/0c4061c0d0e2

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH 1/5] batman-adv: Start new development cycle

[Jiri Pirko]

Fri, Jan 27, 2023 at 11:21:29AM CET, sw@simonwunderlich.de wrote:
>This version will contain all the (major or even only minor) changes for
>Linux 6.3.
>
>The version number isn't a semantic version number with major and minor
>information. It is just encoding the year of the expected publishing as
>Linux -rc1 and the number of published versions this year (starting at 0).

I wonder, what is this versioning good for?

Re: [PATCH 1/5] batman-adv: Start new development cycle

[Linus Lüssing]

On Mon, Jan 30, 2023 at 03:55:08PM +0100, Jiri Pirko wrote:
> Fri, Jan 27, 2023 at 11:21:29AM CET, sw@simonwunderlich.de wrote:
> >This version will contain all the (major or even only minor) changes for
> >Linux 6.3.
> >
> >The version number isn't a semantic version number with major and minor
> >information. It is just encoding the year of the expected publishing as
> >Linux -rc1 and the number of published versions this year (starting at 0).
> 
> I wonder, what is this versioning good for?

The best reason in my opinion is that it's useful to convince
ordinary people that they should update :-).

Usually when debugging reported issues one of the first things we ask
users is to provide the output of "batctl -v":

```
$ batctl -v
batctl debian-2023.0-1 [batman-adv: 2022.3]
```

If there is a very old year in there I think it's easier to tell
and convince people to try again with newer versions and to
update.

And also as a developer I find it easier to (roughly) memorize
when a feature was added by year than by kernel version number.
So I know by heart that TVLVs were added in 2014 and multicast
snooping patches and new multicast handling was added around 2019
for instance. But don't ask me which kernel version that was :D.
I'd have to look that up. So if "batctl -v" displayed a kernel
version number that would be less helpful for me.

Also makes it easier for ordinary users to look up and
compare their version with our news archive:
https://www.open-mesh.org/projects/open-mesh/wiki/News-archive

Also note that we can't do a simple kernel version to year
notation mapping in userspace in batctl. OpenWrt uses the most
recent Linux LTS release. But might feature a backport of a more
recent batman-adv which is newer than the one this stable kernel
would provide. Or people also often use Debian stable but compile
and use the latest batman-adv version with it.

Does that make sense?

Re: [PATCH 1/5] batman-adv: Start new development cycle

[Jiri Pirko]

Thu, Feb 02, 2023 at 07:44:06PM CET, linus.luessing@c0d3.blue wrote:
>On Mon, Jan 30, 2023 at 03:55:08PM +0100, Jiri Pirko wrote:
>> Fri, Jan 27, 2023 at 11:21:29AM CET, sw@simonwunderlich.de wrote:
>> >This version will contain all the (major or even only minor) changes for
>> >Linux 6.3.
>> >
>> >The version number isn't a semantic version number with major and minor
>> >information. It is just encoding the year of the expected publishing as
>> >Linux -rc1 and the number of published versions this year (starting at 0).
>> 
>> I wonder, what is this versioning good for?
>
>The best reason in my opinion is that it's useful to convince
>ordinary people that they should update :-).
>
>Usually when debugging reported issues one of the first things we ask
>users is to provide the output of "batctl -v":
>
>```
>$ batctl -v
>batctl debian-2023.0-1 [batman-adv: 2022.3]

Why kernel version is not enough for you? My point is, why to maintain
internal driver version alongside with the kernel version?

I just don't see any point of having these parallel driver versions.
Looks like a historical relict. IDK.

I'w just wondering, that's all.


>```
>
>If there is a very old year in there I think it's easier to tell
>and convince people to try again with newer versions and to
>update.
>
>And also as a developer I find it easier to (roughly) memorize
>when a feature was added by year than by kernel version number.
>So I know by heart that TVLVs were added in 2014 and multicast
>snooping patches and new multicast handling was added around 2019
>for instance. But don't ask me which kernel version that was :D.
>I'd have to look that up. So if "batctl -v" displayed a kernel
>version number that would be less helpful for me.
>
>Also makes it easier for ordinary users to look up and
>compare their version with our news archive:
>https://www.open-mesh.org/projects/open-mesh/wiki/News-archive
>
>Also note that we can't do a simple kernel version to year
>notation mapping in userspace in batctl. OpenWrt uses the most
>recent Linux LTS release. But might feature a backport of a more
>recent batman-adv which is newer than the one this stable kernel
>would provide. Or people also often use Debian stable but compile
>and use the latest batman-adv version with it.

Yeah, for out of tree driver, have whatever.

>
>Does that make sense?

Re: [PATCH 1/5] batman-adv: Start new development cycle

[Sven Eckelmann]

[-- Attachment #1: Type: text/plain, Size: 1775 bytes --]

On Friday, 3 February 2023 09:29:50 CET Jiri Pirko wrote:
[...]
> Why kernel version is not enough for you? My point is, why to maintain
> internal driver version alongside with the kernel version?
[...]
> >Also note that we can't do a simple kernel version to year
> >notation mapping in userspace in batctl. OpenWrt uses the most
> >recent Linux LTS release. But might feature a backport of a more
> >recent batman-adv which is newer than the one this stable kernel
> >would provide. Or people also often use Debian stable but compile
> >and use the latest batman-adv version with it.
> 
> Yeah, for out of tree driver, have whatever.

A while back, my personal opinion changed after there were various Linux 
developers/maintainers were trying to either remove it or wondering about this 
bump. The idea which I've proposed was to:

* still ship the "backports" like out-of-tree tarball with a module version - 
  but directly in its "compat" code
* continue to use in projects (which for whatever reason cannot use the in-
  kernel implementation) a version which represents their upstream backports 
  tarball + their (patch) revision: Something like "2022.0-openwrt-7"
* for the in-kernel module, just return either 

  - remove the version information completely from the kernel module 
    MODULE_VERSION + drop BATADV_ATTR_VERSION + modifying batctl to fetch that 
    from uname(). But of course, that would break old batctl versions [1]
  - or by setting BATADV_SOURCE_VERSION to UTS_RELEASE (+suffix?) or 
    UTS_VERSION


But this wasn't well received when mentioning it to Simon+Linus (but I could 
misremember the persons involved here).

Kind regards,
	Sven

[1] https://lore.kernel.org/r/20201205085604.1e3fcaee@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com

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Re: [PATCH 1/5] batman-adv: Start new development cycle

[Leon Romanovsky]

On Fri, Feb 03, 2023 at 10:38:07AM +0100, Sven Eckelmann wrote:
> On Friday, 3 February 2023 09:29:50 CET Jiri Pirko wrote:
> [...]
> > Why kernel version is not enough for you? My point is, why to maintain
> > internal driver version alongside with the kernel version?
> [...]
> > >Also note that we can't do a simple kernel version to year
> > >notation mapping in userspace in batctl. OpenWrt uses the most
> > >recent Linux LTS release. But might feature a backport of a more
> > >recent batman-adv which is newer than the one this stable kernel
> > >would provide. Or people also often use Debian stable but compile
> > >and use the latest batman-adv version with it.
> > 
> > Yeah, for out of tree driver, have whatever.
> 
> A while back, my personal opinion changed after there were various Linux 
> developers/maintainers were trying to either remove it or wondering about this 
> bump. The idea which I've proposed was to:
> 
> * still ship the "backports" like out-of-tree tarball with a module version - 
>   but directly in its "compat" code
> * continue to use in projects (which for whatever reason cannot use the in-
>   kernel implementation) a version which represents their upstream backports 
>   tarball + their (patch) revision: Something like "2022.0-openwrt-7"
> * for the in-kernel module, just return either 
> 
>   - remove the version information completely from the kernel module 
>     MODULE_VERSION + drop BATADV_ATTR_VERSION + modifying batctl to fetch that 
>     from uname(). But of course, that would break old batctl versions [1]
>   - or by setting BATADV_SOURCE_VERSION to UTS_RELEASE (+suffix?) or 
>     UTS_VERSION
> 
> 
> But this wasn't well received when mentioning it to Simon+Linus (but I could 
> misremember the persons involved here).

In cases where you can prove real userspace breakage, we simply stop to
update module versions.

Thanks

> 
> Kind regards,
> 	Sven
> 
> [1] https://lore.kernel.org/r/20201205085604.1e3fcaee@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com

Re: [PATCH 1/5] batman-adv: Start new development cycle

[Sven Eckelmann]

[-- Attachment #1: Type: text/plain, Size: 1678 bytes --]

On Tuesday, 7 February 2023 10:02:58 CET Leon Romanovsky wrote:
> In cases where you can prove real userspace breakage, we simply stop to
> update module versions.

That would be the worst option. Then the kernel shows bogus values and no one 
is helped.


And how should I prove it to you? Is that enough?

    $ lsmod|grep '^batman_adv'
    batman_adv            266240  0
    $ sudo batctl -v
    batctl debian-2022.3-2 [batman-adv: module not loaded]
    $ sudo batctl if add enp70s0
    Error - batman-adv module has not been loaded
    $ sudo ip link show dev bat0       
    8: bat0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
        link/ether 7a:8b:21:b7:13:b8 brd ff:ff:ff:ff:ff:ff
    $ sudo ip link set master bat0 dev enp70s0
    $ sudo ip link set up dev bat0
    $ sudo batctl n                         
    Missing attributes from kernel
    $ sudo batctl o
    Missing attributes from kernel


Expected was following output:

    $ sudo batctl -v
    batctl debian-2022.3-2 [batman-adv: 2022.3]
    $ sudo batctl if add enp70s0
    $ sudo ip link show dev bat0
    $ sudo ip link set up dev bat0
    $ sudo batctl n
    [B.A.T.M.A.N. adv 2022.3, MainIF/MAC: enp70s0/2c:f0:5d:04:70:39 (bat0/7a:8b:21:b7:13:b8 BATMAN_IV)]
    IF             Neighbor              last-seen
          enp70s0     50:7b:9d:ce:26:83    0.708s
    $ sudo batctl o
    [B.A.T.M.A.N. adv 2022.3, MainIF/MAC: enp70s0/2c:f0:5d:04:70:39 (bat0/7a:8b:21:b7:13:b8 BATMAN_IV)]
       Originator        last-seen (#/255) Nexthop           [outgoingIF]
     * 50:7b:9d:ce:26:83    0.684s   (255) 50:7b:9d:ce:26:83 [   enp70s0]

Kind regards,
	Sven

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Re: [PATCH 1/5] batman-adv: Start new development cycle

[Leon Romanovsky]

On Tue, Feb 07, 2023 at 10:50:08AM +0100, Sven Eckelmann wrote:
> On Tuesday, 7 February 2023 10:02:58 CET Leon Romanovsky wrote:
> > In cases where you can prove real userspace breakage, we simply stop to
> > update module versions.
> 
> That would be the worst option. Then the kernel shows bogus values and no one 
> is helped.

The thing is that you already show bogus values.

Most users don't compile their kernel, but use distro-based one. The
latter is a mix of base kernel, fixes and sometimes backports.

For example, on my system:
➜  kernel git:(wip/leon-for-next) modinfo batman_adv
filename:       /lib/modules/6.1.9-200.fc37.x86_64/kernel/net/batman-adv/batman-adv.ko.xz
....
version:        2022.3
description:    B.A.T.M.A.N. advanced
...
name:           batman_adv
vermagic:       6.1.9-200.fc37.x86_64 SMP preempt mod_unload

As you can see both of us have 2022.3 in version string, but are we
running same code?

The answer is no as you run debian and I'm running latest Fedora with
different kernel version, which means different batman_adv feature set.

Once you stop to update version, you will push users to look on the real
version (kernel) which really matters.

Thanks

> 
> 
> And how should I prove it to you? Is that enough?
> 
>     $ lsmod|grep '^batman_adv'
>     batman_adv            266240  0
>     $ sudo batctl -v
>     batctl debian-2022.3-2 [batman-adv: module not loaded]
>     $ sudo batctl if add enp70s0
>     Error - batman-adv module has not been loaded
>     $ sudo ip link show dev bat0       
>     8: bat0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
>         link/ether 7a:8b:21:b7:13:b8 brd ff:ff:ff:ff:ff:ff
>     $ sudo ip link set master bat0 dev enp70s0
>     $ sudo ip link set up dev bat0
>     $ sudo batctl n                         
>     Missing attributes from kernel
>     $ sudo batctl o
>     Missing attributes from kernel
> 
> 
> Expected was following output:
> 
>     $ sudo batctl -v
>     batctl debian-2022.3-2 [batman-adv: 2022.3]
>     $ sudo batctl if add enp70s0
>     $ sudo ip link show dev bat0
>     $ sudo ip link set up dev bat0
>     $ sudo batctl n
>     [B.A.T.M.A.N. adv 2022.3, MainIF/MAC: enp70s0/2c:f0:5d:04:70:39 (bat0/7a:8b:21:b7:13:b8 BATMAN_IV)]
>     IF             Neighbor              last-seen
>           enp70s0     50:7b:9d:ce:26:83    0.708s
>     $ sudo batctl o
>     [B.A.T.M.A.N. adv 2022.3, MainIF/MAC: enp70s0/2c:f0:5d:04:70:39 (bat0/7a:8b:21:b7:13:b8 BATMAN_IV)]
>        Originator        last-seen (#/255) Nexthop           [outgoingIF]
>      * 50:7b:9d:ce:26:83    0.684s   (255) 50:7b:9d:ce:26:83 [   enp70s0]
> 
> Kind regards,
> 	Sven

Re: [PATCH 1/5] batman-adv: Start new development cycle

[Sven Eckelmann]

[-- Attachment #1: Type: text/plain, Size: 645 bytes --]

On Tuesday, 7 February 2023 11:41:53 CET Leon Romanovsky wrote:
> Once you stop to update version, you will push users to look on the real
> version (kernel) which really matters.

I would have understood if you say "let us use a magic value like 'in-tree' or 
'linux'" but setting it to an old (existing) version number - I don't want to 
live with the headaches it creates. Because this is what users often don't 
(want) to understand: if it looks like a valid version number, why isn't it 
the valid version number? So I have to do a lot of pushing - without any 
rewards because it is necessary to push every new "user".

Kind regards,
	Sven

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Re: [PATCH 1/5] batman-adv: Start new development cycle

[Leon Romanovsky]

On Tue, Feb 07, 2023 at 11:57:41AM +0100, Sven Eckelmann wrote:
> On Tuesday, 7 February 2023 11:41:53 CET Leon Romanovsky wrote:
> > Once you stop to update version, you will push users to look on the real
> > version (kernel) which really matters.
> 
> I would have understood if you say "let us use a magic value like 'in-tree' or 
> 'linux'" but setting it to an old (existing) version number - I don't want to 
> live with the headaches it creates. Because this is what users often don't 
> (want) to understand: if it looks like a valid version number, why isn't it 
> the valid version number? So I have to do a lot of pushing - without any 
> rewards because it is necessary to push every new "user".

I'm not sharing your view about users and think they need to be educated,
even it is hard and non-rewarding job.

Thanks

> 
> Kind regards,
> 	Sven

[PATCH 2/5] batman-adv: Drop prandom.h includes

[Simon Wunderlich]

From: Sven Eckelmann <sven@narfation.org>

The commit 8032bf1233a7 ("treewide: use get_random_u32_below() instead of
deprecated function") replaced the prandom.h function prandom_u32_max with
the random.h function get_random_u32_below. There is no need to still
include prandom.h.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/bat_iv_ogm.c     | 1 -
 net/batman-adv/bat_v_elp.c      | 1 -
 net/batman-adv/bat_v_ogm.c      | 1 -
 net/batman-adv/network-coding.c | 2 +-
 4 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 114ee5da261f..828fb393ee94 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -27,7 +27,6 @@
 #include <linux/netdevice.h>
 #include <linux/netlink.h>
 #include <linux/pkt_sched.h>
-#include <linux/prandom.h>
 #include <linux/printk.h>
 #include <linux/random.h>
 #include <linux/rculist.h>
diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c
index f9a58fb5442e..acff565849ae 100644
--- a/net/batman-adv/bat_v_elp.c
+++ b/net/batman-adv/bat_v_elp.c
@@ -21,7 +21,6 @@
 #include <linux/minmax.h>
 #include <linux/netdevice.h>
 #include <linux/nl80211.h>
-#include <linux/prandom.h>
 #include <linux/random.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c
index addfd8c4fe95..96e027364ddd 100644
--- a/net/batman-adv/bat_v_ogm.c
+++ b/net/batman-adv/bat_v_ogm.c
@@ -21,7 +21,6 @@
 #include <linux/minmax.h>
 #include <linux/mutex.h>
 #include <linux/netdevice.h>
-#include <linux/prandom.h>
 #include <linux/random.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index bf29fba4dde5..ecd871abda34 100644
--- a/net/batman-adv/network-coding.c
+++ b/net/batman-adv/network-coding.c
@@ -25,8 +25,8 @@
 #include <linux/lockdep.h>
 #include <linux/net.h>
 #include <linux/netdevice.h>
-#include <linux/prandom.h>
 #include <linux/printk.h>
+#include <linux/random.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
 #include <linux/skbuff.h>
-- 
2.30.2

[PATCH 3/5] batman-adv: Fix mailing list address

[Simon Wunderlich]

From: Sven Eckelmann <sven@narfation.org>

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 Documentation/networking/batman-adv.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/networking/batman-adv.rst b/Documentation/networking/batman-adv.rst
index b85563ea3682..8a0dcb1894b4 100644
--- a/Documentation/networking/batman-adv.rst
+++ b/Documentation/networking/batman-adv.rst
@@ -159,7 +159,7 @@ Please send us comments, experiences, questions, anything :)
 IRC:
   #batadv on ircs://irc.hackint.org/
 Mailing-list:
-  b.a.t.m.a.n@open-mesh.org (optional subscription at
+  b.a.t.m.a.n@lists.open-mesh.org (optional subscription at
   https://lists.open-mesh.org/mailman3/postorius/lists/b.a.t.m.a.n.lists.open-mesh.org/)
 
 You can also contact the Authors:
-- 
2.30.2

[PATCH 4/5] batman-adv: mcast: remove now redundant single ucast forwarding

[Simon Wunderlich]

From: Linus Lüssing <linus.luessing@c0d3.blue>

The multicast code to send a multicast packet via multiple batman-adv
unicast packets is not only capable of sending to multiple but also to a
single node. Therefore we can safely remove the old, specialized, now
redundant multicast-to-single-unicast code.

The only functional change of this simplification is that the edge case
of allowing a multicast packet with an unsnoopable destination address
(224.0.0.0/24 or ff02::1) where only a single node has signaled interest
in it via the batman-adv want-all-unsnoopables multicast flag is now
transmitted via a batman-adv broadcast instead of a batman-adv unicast
packet. Maintaining this edge case feature does not seem worth the extra
lines of code and people should just not expect to be able to snoop and
optimize such unsnoopable multicast addresses when bridges are involved.

While at it also renaming a few items in the batadv_forw_mode enum to
prepare for the new batman-adv multicast packet type.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/multicast.c      | 249 ++------------------------------
 net/batman-adv/multicast.h      |  38 +----
 net/batman-adv/soft-interface.c |  26 ++--
 3 files changed, 33 insertions(+), 280 deletions(-)

diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index b238455913df..7e2822c01e00 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -26,7 +26,6 @@
 #include <linux/ipv6.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
-#include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/lockdep.h>
 #include <linux/netdevice.h>
@@ -1136,223 +1135,20 @@ static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv,
 	}
 }
 
-/**
- * batadv_mcast_forw_tt_node_get() - get a multicast tt node
- * @bat_priv: the bat priv with all the soft interface information
- * @ethhdr: the ether header containing the multicast destination
- *
- * Return: an orig_node matching the multicast address provided by ethhdr
- * via a translation table lookup. This increases the returned nodes refcount.
- */
-static struct batadv_orig_node *
-batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
-			      struct ethhdr *ethhdr)
-{
-	return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest,
-					BATADV_NO_FLAGS);
-}
-
-/**
- * batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag
- * @bat_priv: the bat priv with all the soft interface information
- *
- * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and
- * increases its refcount.
- */
-static struct batadv_orig_node *
-batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv)
-{
-	struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(tmp_orig_node,
-				 &bat_priv->mcast.want_all_ipv4_list,
-				 mcast_want_all_ipv4_node) {
-		if (!kref_get_unless_zero(&tmp_orig_node->refcount))
-			continue;
-
-		orig_node = tmp_orig_node;
-		break;
-	}
-	rcu_read_unlock();
-
-	return orig_node;
-}
-
-/**
- * batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag
- * @bat_priv: the bat priv with all the soft interface information
- *
- * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set
- * and increases its refcount.
- */
-static struct batadv_orig_node *
-batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv)
-{
-	struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(tmp_orig_node,
-				 &bat_priv->mcast.want_all_ipv6_list,
-				 mcast_want_all_ipv6_node) {
-		if (!kref_get_unless_zero(&tmp_orig_node->refcount))
-			continue;
-
-		orig_node = tmp_orig_node;
-		break;
-	}
-	rcu_read_unlock();
-
-	return orig_node;
-}
-
-/**
- * batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag
- * @bat_priv: the bat priv with all the soft interface information
- * @ethhdr: an ethernet header to determine the protocol family from
- *
- * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or
- * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, sets and
- * increases its refcount.
- */
-static struct batadv_orig_node *
-batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv,
-			      struct ethhdr *ethhdr)
-{
-	switch (ntohs(ethhdr->h_proto)) {
-	case ETH_P_IP:
-		return batadv_mcast_forw_ipv4_node_get(bat_priv);
-	case ETH_P_IPV6:
-		return batadv_mcast_forw_ipv6_node_get(bat_priv);
-	default:
-		/* we shouldn't be here... */
-		return NULL;
-	}
-}
-
-/**
- * batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag
- * @bat_priv: the bat priv with all the soft interface information
- *
- * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag
- * set and increases its refcount.
- */
-static struct batadv_orig_node *
-batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv)
-{
-	struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(tmp_orig_node,
-				 &bat_priv->mcast.want_all_unsnoopables_list,
-				 mcast_want_all_unsnoopables_node) {
-		if (!kref_get_unless_zero(&tmp_orig_node->refcount))
-			continue;
-
-		orig_node = tmp_orig_node;
-		break;
-	}
-	rcu_read_unlock();
-
-	return orig_node;
-}
-
-/**
- * batadv_mcast_forw_rtr4_node_get() - get a node with an ipv4 mcast router flag
- * @bat_priv: the bat priv with all the soft interface information
- *
- * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR4 flag unset and
- * increases its refcount.
- */
-static struct batadv_orig_node *
-batadv_mcast_forw_rtr4_node_get(struct batadv_priv *bat_priv)
-{
-	struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(tmp_orig_node,
-				 &bat_priv->mcast.want_all_rtr4_list,
-				 mcast_want_all_rtr4_node) {
-		if (!kref_get_unless_zero(&tmp_orig_node->refcount))
-			continue;
-
-		orig_node = tmp_orig_node;
-		break;
-	}
-	rcu_read_unlock();
-
-	return orig_node;
-}
-
-/**
- * batadv_mcast_forw_rtr6_node_get() - get a node with an ipv6 mcast router flag
- * @bat_priv: the bat priv with all the soft interface information
- *
- * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR6 flag unset
- * and increases its refcount.
- */
-static struct batadv_orig_node *
-batadv_mcast_forw_rtr6_node_get(struct batadv_priv *bat_priv)
-{
-	struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(tmp_orig_node,
-				 &bat_priv->mcast.want_all_rtr6_list,
-				 mcast_want_all_rtr6_node) {
-		if (!kref_get_unless_zero(&tmp_orig_node->refcount))
-			continue;
-
-		orig_node = tmp_orig_node;
-		break;
-	}
-	rcu_read_unlock();
-
-	return orig_node;
-}
-
-/**
- * batadv_mcast_forw_rtr_node_get() - get a node with an ipv4/ipv6 router flag
- * @bat_priv: the bat priv with all the soft interface information
- * @ethhdr: an ethernet header to determine the protocol family from
- *
- * Return: an orig_node which has no BATADV_MCAST_WANT_NO_RTR4 or
- * BATADV_MCAST_WANT_NO_RTR6 flag, depending on the provided ethhdr, set and
- * increases its refcount.
- */
-static struct batadv_orig_node *
-batadv_mcast_forw_rtr_node_get(struct batadv_priv *bat_priv,
-			       struct ethhdr *ethhdr)
-{
-	switch (ntohs(ethhdr->h_proto)) {
-	case ETH_P_IP:
-		return batadv_mcast_forw_rtr4_node_get(bat_priv);
-	case ETH_P_IPV6:
-		return batadv_mcast_forw_rtr6_node_get(bat_priv);
-	default:
-		/* we shouldn't be here... */
-		return NULL;
-	}
-}
-
 /**
  * batadv_mcast_forw_mode() - check on how to forward a multicast packet
  * @bat_priv: the bat priv with all the soft interface information
- * @skb: The multicast packet to check
- * @orig: an originator to be set to forward the skb to
+ * @skb: the multicast packet to check
  * @is_routable: stores whether the destination is routable
  *
- * Return: the forwarding mode as enum batadv_forw_mode and in case of
- * BATADV_FORW_SINGLE set the orig to the single originator the skb
- * should be forwarded to.
+ * Return: The forwarding mode as enum batadv_forw_mode.
  */
 enum batadv_forw_mode
 batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
-		       struct batadv_orig_node **orig, int *is_routable)
+		       int *is_routable)
 {
 	int ret, tt_count, ip_count, unsnoop_count, total_count;
 	bool is_unsnoopable = false;
-	unsigned int mcast_fanout;
 	struct ethhdr *ethhdr;
 	int rtr_count = 0;
 
@@ -1361,7 +1157,7 @@ batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
 	if (ret == -ENOMEM)
 		return BATADV_FORW_NONE;
 	else if (ret < 0)
-		return BATADV_FORW_ALL;
+		return BATADV_FORW_BCAST;
 
 	ethhdr = eth_hdr(skb);
 
@@ -1374,32 +1170,15 @@ batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
 
 	total_count = tt_count + ip_count + unsnoop_count + rtr_count;
 
-	switch (total_count) {
-	case 1:
-		if (tt_count)
-			*orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
-		else if (ip_count)
-			*orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr);
-		else if (unsnoop_count)
-			*orig = batadv_mcast_forw_unsnoop_node_get(bat_priv);
-		else if (rtr_count)
-			*orig = batadv_mcast_forw_rtr_node_get(bat_priv,
-							       ethhdr);
-
-		if (*orig)
-			return BATADV_FORW_SINGLE;
-
-		fallthrough;
-	case 0:
+	if (!total_count)
 		return BATADV_FORW_NONE;
-	default:
-		mcast_fanout = atomic_read(&bat_priv->multicast_fanout);
+	else if (unsnoop_count)
+		return BATADV_FORW_BCAST;
 
-		if (!unsnoop_count && total_count <= mcast_fanout)
-			return BATADV_FORW_SOME;
-	}
+	if (total_count <= atomic_read(&bat_priv->multicast_fanout))
+		return BATADV_FORW_UCASTS;
 
-	return BATADV_FORW_ALL;
+	return BATADV_FORW_BCAST;
 }
 
 /**
@@ -1411,10 +1190,10 @@ batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
  *
  * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
  */
-int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
-				struct sk_buff *skb,
-				unsigned short vid,
-				struct batadv_orig_node *orig_node)
+static int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
+				       struct sk_buff *skb,
+				       unsigned short vid,
+				       struct batadv_orig_node *orig_node)
 {
 	/* Avoid sending multicast-in-unicast packets to other BLA
 	 * gateways - they already got the frame from the LAN side
diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h
index 8aec818d0bf6..a9770d8d6d36 100644
--- a/net/batman-adv/multicast.h
+++ b/net/batman-adv/multicast.h
@@ -17,23 +17,16 @@
  */
 enum batadv_forw_mode {
 	/**
-	 * @BATADV_FORW_ALL: forward the packet to all nodes (currently via
-	 *  classic flooding)
+	 * @BATADV_FORW_BCAST: forward the packet to all nodes via a batman-adv
+	 *  broadcast packet
 	 */
-	BATADV_FORW_ALL,
+	BATADV_FORW_BCAST,
 
 	/**
-	 * @BATADV_FORW_SOME: forward the packet to some nodes (currently via
-	 *  a multicast-to-unicast conversion and the BATMAN unicast routing
-	 *  protocol)
+	 * @BATADV_FORW_UCASTS: forward the packet to some nodes via one
+	 *  or more batman-adv unicast packets
 	 */
-	BATADV_FORW_SOME,
-
-	/**
-	 * @BATADV_FORW_SINGLE: forward the packet to a single node (currently
-	 *  via the BATMAN unicast routing protocol)
-	 */
-	BATADV_FORW_SINGLE,
+	BATADV_FORW_UCASTS,
 
 	/** @BATADV_FORW_NONE: don't forward, drop it */
 	BATADV_FORW_NONE,
@@ -43,14 +36,8 @@ enum batadv_forw_mode {
 
 enum batadv_forw_mode
 batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
-		       struct batadv_orig_node **mcast_single_orig,
 		       int *is_routable);
 
-int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
-				struct sk_buff *skb,
-				unsigned short vid,
-				struct batadv_orig_node *orig_node);
-
 int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
 			   unsigned short vid, int is_routable);
 
@@ -69,20 +56,9 @@ void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);
 
 static inline enum batadv_forw_mode
 batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
-		       struct batadv_orig_node **mcast_single_orig,
 		       int *is_routable)
 {
-	return BATADV_FORW_ALL;
-}
-
-static inline int
-batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
-			    struct sk_buff *skb,
-			    unsigned short vid,
-			    struct batadv_orig_node *orig_node)
-{
-	kfree_skb(skb);
-	return NET_XMIT_DROP;
+	return BATADV_FORW_BCAST;
 }
 
 static inline int
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 0f5c0679b55a..125f4628687c 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -48,7 +48,6 @@
 #include "hard-interface.h"
 #include "multicast.h"
 #include "network-coding.h"
-#include "originator.h"
 #include "send.h"
 #include "translation-table.h"
 
@@ -196,8 +195,7 @@ static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
 	unsigned short vid;
 	u32 seqno;
 	int gw_mode;
-	enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE;
-	struct batadv_orig_node *mcast_single_orig = NULL;
+	enum batadv_forw_mode forw_mode = BATADV_FORW_BCAST;
 	int mcast_is_routable = 0;
 	int network_offset = ETH_HLEN;
 	__be16 proto;
@@ -301,14 +299,18 @@ static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
 send:
 		if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
 			forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
-							   &mcast_single_orig,
 							   &mcast_is_routable);
-			if (forw_mode == BATADV_FORW_NONE)
-				goto dropped;
-
-			if (forw_mode == BATADV_FORW_SINGLE ||
-			    forw_mode == BATADV_FORW_SOME)
+			switch (forw_mode) {
+			case BATADV_FORW_BCAST:
+				break;
+			case BATADV_FORW_UCASTS:
 				do_bcast = false;
+				break;
+			case BATADV_FORW_NONE:
+				fallthrough;
+			default:
+				goto dropped;
+			}
 		}
 	}
 
@@ -357,10 +359,7 @@ static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
 			if (ret)
 				goto dropped;
 			ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
-		} else if (mcast_single_orig) {
-			ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid,
-							  mcast_single_orig);
-		} else if (forw_mode == BATADV_FORW_SOME) {
+		} else if (forw_mode == BATADV_FORW_UCASTS) {
 			ret = batadv_mcast_forw_send(bat_priv, skb, vid,
 						     mcast_is_routable);
 		} else {
@@ -386,7 +385,6 @@ static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
 dropped_freed:
 	batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 end:
-	batadv_orig_node_put(mcast_single_orig);
 	batadv_hardif_put(primary_if);
 	return NETDEV_TX_OK;
 }
-- 
2.30.2

[PATCH 5/5] batman-adv: tvlv: prepare for tvlv enabled multicast packet type

[Simon Wunderlich]

From: Linus Lüssing <linus.luessing@c0d3.blue>

Prepare TVLV infrastructure for more packet types, in particular the
upcoming batman-adv multicast packet type.

For that swap the OGM vs. unicast-tvlv packet boolean indicator to an
explicit unsigned integer packet type variable. And provide the skb
to a call to batadv_tvlv_containers_process(), as later the multicast
packet's TVLV handler will need to have access not only to the TVLV but
the full skb for forwarding. Forwarding will be invoked from the
multicast packet's TVLVs' contents later.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 include/uapi/linux/batadv_packet.h     |  2 +
 net/batman-adv/bat_v_ogm.c             |  4 +-
 net/batman-adv/distributed-arp-table.c |  2 +-
 net/batman-adv/gateway_common.c        |  2 +-
 net/batman-adv/multicast.c             |  2 +-
 net/batman-adv/network-coding.c        |  2 +-
 net/batman-adv/routing.c               |  7 ++-
 net/batman-adv/translation-table.c     |  4 +-
 net/batman-adv/tvlv.c                  | 71 ++++++++++++++++++--------
 net/batman-adv/tvlv.h                  |  9 ++--
 net/batman-adv/types.h                 |  6 +++
 11 files changed, 74 insertions(+), 37 deletions(-)

diff --git a/include/uapi/linux/batadv_packet.h b/include/uapi/linux/batadv_packet.h
index ea4692c339ce..9204e4494b25 100644
--- a/include/uapi/linux/batadv_packet.h
+++ b/include/uapi/linux/batadv_packet.h
@@ -26,6 +26,7 @@
  * @BATADV_CODED: network coded packets
  * @BATADV_ELP: echo location packets for B.A.T.M.A.N. V
  * @BATADV_OGM2: originator messages for B.A.T.M.A.N. V
+ * @BATADV_MCAST: multicast packet with multiple destination addresses
  *
  * @BATADV_UNICAST: unicast packets carrying unicast payload traffic
  * @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original
@@ -42,6 +43,7 @@ enum batadv_packettype {
 	BATADV_CODED            = 0x02,
 	BATADV_ELP		= 0x03,
 	BATADV_OGM2		= 0x04,
+	BATADV_MCAST            = 0x05,
 	/* 0x40 - 0x7f: unicast */
 #define BATADV_UNICAST_MIN     0x40
 	BATADV_UNICAST          = 0x40,
diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c
index 96e027364ddd..e710e9afe78f 100644
--- a/net/batman-adv/bat_v_ogm.c
+++ b/net/batman-adv/bat_v_ogm.c
@@ -799,8 +799,8 @@ batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv,
 
 	/* only unknown & newer OGMs contain TVLVs we are interested in */
 	if (seqno_age > 0 && if_outgoing == BATADV_IF_DEFAULT)
-		batadv_tvlv_containers_process(bat_priv, true, orig_node,
-					       NULL, NULL,
+		batadv_tvlv_containers_process(bat_priv, BATADV_OGM2, orig_node,
+					       NULL,
 					       (unsigned char *)(ogm2 + 1),
 					       ntohs(ogm2->tvlv_len));
 
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index fefb51a5f606..6968e55eb971 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -822,7 +822,7 @@ int batadv_dat_init(struct batadv_priv *bat_priv)
 	batadv_dat_start_timer(bat_priv);
 
 	batadv_tvlv_handler_register(bat_priv, batadv_dat_tvlv_ogm_handler_v1,
-				     NULL, BATADV_TVLV_DAT, 1,
+				     NULL, NULL, BATADV_TVLV_DAT, 1,
 				     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
 	batadv_dat_tvlv_container_update(bat_priv);
 	return 0;
diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c
index 9349c76f30c5..6a964a773f57 100644
--- a/net/batman-adv/gateway_common.c
+++ b/net/batman-adv/gateway_common.c
@@ -259,7 +259,7 @@ void batadv_gw_init(struct batadv_priv *bat_priv)
 		atomic_set(&bat_priv->gw.sel_class, 1);
 
 	batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
-				     NULL, BATADV_TVLV_GW, 1,
+				     NULL, NULL, BATADV_TVLV_GW, 1,
 				     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
 }
 
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 7e2822c01e00..315394f12c55 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -1818,7 +1818,7 @@ static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv,
 void batadv_mcast_init(struct batadv_priv *bat_priv)
 {
 	batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler,
-				     NULL, BATADV_TVLV_MCAST, 2,
+				     NULL, NULL, BATADV_TVLV_MCAST, 2,
 				     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
 
 	INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update);
diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index ecd871abda34..71ebd0284f95 100644
--- a/net/batman-adv/network-coding.c
+++ b/net/batman-adv/network-coding.c
@@ -160,7 +160,7 @@ int batadv_nc_mesh_init(struct batadv_priv *bat_priv)
 	batadv_nc_start_timer(bat_priv);
 
 	batadv_tvlv_handler_register(bat_priv, batadv_nc_tvlv_ogm_handler_v1,
-				     NULL, BATADV_TVLV_NC, 1,
+				     NULL, NULL, BATADV_TVLV_NC, 1,
 				     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
 	batadv_nc_tvlv_container_update(bat_priv);
 	return 0;
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 83f31494ea4d..163cd43c4821 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -1073,10 +1073,9 @@ int batadv_recv_unicast_tvlv(struct sk_buff *skb,
 	if (tvlv_buff_len > skb->len - hdr_size)
 		goto free_skb;
 
-	ret = batadv_tvlv_containers_process(bat_priv, false, NULL,
-					     unicast_tvlv_packet->src,
-					     unicast_tvlv_packet->dst,
-					     tvlv_buff, tvlv_buff_len);
+	ret = batadv_tvlv_containers_process(bat_priv, BATADV_UNICAST_TVLV,
+					     NULL, skb, tvlv_buff,
+					     tvlv_buff_len);
 
 	if (ret != NET_RX_SUCCESS) {
 		ret = batadv_route_unicast_packet(skb, recv_if);
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 01d30c1e412c..36ca31252a73 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -4168,11 +4168,11 @@ int batadv_tt_init(struct batadv_priv *bat_priv)
 	}
 
 	batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
-				     batadv_tt_tvlv_unicast_handler_v1,
+				     batadv_tt_tvlv_unicast_handler_v1, NULL,
 				     BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
 
 	batadv_tvlv_handler_register(bat_priv, NULL,
-				     batadv_roam_tvlv_unicast_handler_v1,
+				     batadv_roam_tvlv_unicast_handler_v1, NULL,
 				     BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
 
 	INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
diff --git a/net/batman-adv/tvlv.c b/net/batman-adv/tvlv.c
index 7ec2e2343884..2a583215d439 100644
--- a/net/batman-adv/tvlv.c
+++ b/net/batman-adv/tvlv.c
@@ -352,10 +352,9 @@ u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
  *  appropriate handlers
  * @bat_priv: the bat priv with all the soft interface information
  * @tvlv_handler: tvlv callback function handling the tvlv content
- * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
+ * @packet_type: indicates for which packet type the TVLV handler is called
  * @orig_node: orig node emitting the ogm packet
- * @src: source mac address of the unicast packet
- * @dst: destination mac address of the unicast packet
+ * @skb: the skb the TVLV handler is called for
  * @tvlv_value: tvlv content
  * @tvlv_value_len: tvlv content length
  *
@@ -364,15 +363,20 @@ u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
  */
 static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
 				    struct batadv_tvlv_handler *tvlv_handler,
-				    bool ogm_source,
+				    u8 packet_type,
 				    struct batadv_orig_node *orig_node,
-				    u8 *src, u8 *dst,
-				    void *tvlv_value, u16 tvlv_value_len)
+				    struct sk_buff *skb, void *tvlv_value,
+				    u16 tvlv_value_len)
 {
+	unsigned int tvlv_offset;
+	u8 *src, *dst;
+
 	if (!tvlv_handler)
 		return NET_RX_SUCCESS;
 
-	if (ogm_source) {
+	switch (packet_type) {
+	case BATADV_IV_OGM:
+	case BATADV_OGM2:
 		if (!tvlv_handler->ogm_handler)
 			return NET_RX_SUCCESS;
 
@@ -383,19 +387,32 @@ static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
 					  BATADV_NO_FLAGS,
 					  tvlv_value, tvlv_value_len);
 		tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
-	} else {
-		if (!src)
-			return NET_RX_SUCCESS;
-
-		if (!dst)
+		break;
+	case BATADV_UNICAST_TVLV:
+		if (!skb)
 			return NET_RX_SUCCESS;
 
 		if (!tvlv_handler->unicast_handler)
 			return NET_RX_SUCCESS;
 
+		src = ((struct batadv_unicast_tvlv_packet *)skb->data)->src;
+		dst = ((struct batadv_unicast_tvlv_packet *)skb->data)->dst;
+
 		return tvlv_handler->unicast_handler(bat_priv, src,
 						     dst, tvlv_value,
 						     tvlv_value_len);
+	case BATADV_MCAST:
+		if (!skb)
+			return NET_RX_SUCCESS;
+
+		if (!tvlv_handler->mcast_handler)
+			return NET_RX_SUCCESS;
+
+		tvlv_offset = (unsigned char *)tvlv_value - skb->data;
+		skb_set_network_header(skb, tvlv_offset);
+		skb_set_transport_header(skb, tvlv_offset + tvlv_value_len);
+
+		return tvlv_handler->mcast_handler(bat_priv, skb);
 	}
 
 	return NET_RX_SUCCESS;
@@ -405,10 +422,9 @@ static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
  * batadv_tvlv_containers_process() - parse the given tvlv buffer to call the
  *  appropriate handlers
  * @bat_priv: the bat priv with all the soft interface information
- * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
+ * @packet_type: indicates for which packet type the TVLV handler is called
  * @orig_node: orig node emitting the ogm packet
- * @src: source mac address of the unicast packet
- * @dst: destination mac address of the unicast packet
+ * @skb: the skb the TVLV handler is called for
  * @tvlv_value: tvlv content
  * @tvlv_value_len: tvlv content length
  *
@@ -416,10 +432,10 @@ static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
  * handler callbacks.
  */
 int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
-				   bool ogm_source,
+				   u8 packet_type,
 				   struct batadv_orig_node *orig_node,
-				   u8 *src, u8 *dst,
-				   void *tvlv_value, u16 tvlv_value_len)
+				   struct sk_buff *skb, void *tvlv_value,
+				   u16 tvlv_value_len)
 {
 	struct batadv_tvlv_handler *tvlv_handler;
 	struct batadv_tvlv_hdr *tvlv_hdr;
@@ -441,20 +457,24 @@ int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
 						       tvlv_hdr->version);
 
 		ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
-						ogm_source, orig_node,
-						src, dst, tvlv_value,
+						packet_type, orig_node, skb,
+						tvlv_value,
 						tvlv_value_cont_len);
 		batadv_tvlv_handler_put(tvlv_handler);
 		tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len;
 		tvlv_value_len -= tvlv_value_cont_len;
 	}
 
-	if (!ogm_source)
+	if (packet_type != BATADV_IV_OGM &&
+	    packet_type != BATADV_OGM2)
 		return ret;
 
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(tvlv_handler,
 				 &bat_priv->tvlv.handler_list, list) {
+		if (!tvlv_handler->ogm_handler)
+			continue;
+
 		if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
 		    !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
 			tvlv_handler->ogm_handler(bat_priv, orig_node,
@@ -490,7 +510,7 @@ void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
 
 	tvlv_value = batadv_ogm_packet + 1;
 
-	batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL,
+	batadv_tvlv_containers_process(bat_priv, BATADV_IV_OGM, orig_node, NULL,
 				       tvlv_value, tvlv_value_len);
 }
 
@@ -504,6 +524,10 @@ void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
  * @uptr: unicast tvlv handler callback function. This function receives the
  *  source & destination of the unicast packet as well as the tvlv content
  *  to process.
+ * @mptr: multicast packet tvlv handler callback function. This function
+ *  receives the full skb to process, with the skb network header pointing
+ *  to the current tvlv and the skb transport header pointing to the first
+ *  byte after the current tvlv.
  * @type: tvlv handler type to be registered
  * @version: tvlv handler version to be registered
  * @flags: flags to enable or disable TVLV API behavior
@@ -518,6 +542,8 @@ void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
 					      u8 *src, u8 *dst,
 					      void *tvlv_value,
 					      u16 tvlv_value_len),
+				  int (*mptr)(struct batadv_priv *bat_priv,
+					      struct sk_buff *skb),
 				  u8 type, u8 version, u8 flags)
 {
 	struct batadv_tvlv_handler *tvlv_handler;
@@ -539,6 +565,7 @@ void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
 
 	tvlv_handler->ogm_handler = optr;
 	tvlv_handler->unicast_handler = uptr;
+	tvlv_handler->mcast_handler = mptr;
 	tvlv_handler->type = type;
 	tvlv_handler->version = version;
 	tvlv_handler->flags = flags;
diff --git a/net/batman-adv/tvlv.h b/net/batman-adv/tvlv.h
index 4cf8af00fc11..e5697230d991 100644
--- a/net/batman-adv/tvlv.h
+++ b/net/batman-adv/tvlv.h
@@ -9,6 +9,7 @@
 
 #include "main.h"
 
+#include <linux/skbuff.h>
 #include <linux/types.h>
 #include <uapi/linux/batadv_packet.h>
 
@@ -34,14 +35,16 @@ void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
 					      u8 *src, u8 *dst,
 					      void *tvlv_value,
 					      u16 tvlv_value_len),
+				  int (*mptr)(struct batadv_priv *bat_priv,
+					      struct sk_buff *skb),
 				  u8 type, u8 version, u8 flags);
 void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
 				    u8 type, u8 version);
 int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
-				   bool ogm_source,
+				   u8 packet_type,
 				   struct batadv_orig_node *orig_node,
-				   u8 *src, u8 *dst,
-				   void *tvlv_buff, u16 tvlv_buff_len);
+				   struct sk_buff *skb, void *tvlv_buff,
+				   u16 tvlv_buff_len);
 void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, const u8 *src,
 			      const u8 *dst, u8 type, u8 version,
 			      void *tvlv_value, u16 tvlv_value_len);
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 758cd797a063..ca9449ec9836 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -2335,6 +2335,12 @@ struct batadv_tvlv_handler {
 			       u8 *src, u8 *dst,
 			       void *tvlv_value, u16 tvlv_value_len);
 
+	/**
+	 * @mcast_handler: handler callback which is given the tvlv payload to
+	 *  process on incoming mcast packet
+	 */
+	int (*mcast_handler)(struct batadv_priv *bat_priv, struct sk_buff *skb);
+
 	/** @type: tvlv type this handler feels responsible for */
 	u8 type;
 
-- 
2.30.2