commits May 2024

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (9847f8cd)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 9847f8cd001e62a58f31bbbfdfedb712d078bb3d Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 20:59:53 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- 9847f8cd001e62a58f31bbbfdfedb712d078bb3d batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index 96e1e01b..a8c437f7 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -86,6 +86,16 @@ Answer: **no!** !mld-to-mcast-routers-only-scenario-C.png! +Learning: + +1) Bridged-in host A listens to a link-local multicast address <MC-LL-A> +2) Node Y floods an MLD Query through the mesh +3) Host A replies to the MLD query with an MLD Report for <MC-LL-A> +3.1) br0 on node X learns that a listener for <MC-LL-A> is behind eth0 and then forwards the MLD Report further towards the querier on bat0, as required by RFC4541 +3.2) batman-adv on node X learns about the listener for <MC-LL-A> through the export of the bridge and then adds it to TT, which gets distributed to other nodes. +3.3) With the batman-adv multicast_rtr_only option enabled bat0 on node X will not forward the MLD Report +3.4) batman-adv on nodes Y learns about <MC-LL-A> through the TT + Potential Workarounds: A) Set bridge port _multicast_router_ setting for bat0 to 2 (e.g.: _$ echo 2 > /sys/class/net/bat0/brport/multicast_router_) => always forwards multicast packets to bat0

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (7afdcf1d)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 7afdcf1d21ed41abbe18f04fa83b467e2b9a9ecc Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 21:00:20 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- 7afdcf1d21ed41abbe18f04fa83b467e2b9a9ecc batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index a8c437f7..05308ccc 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -62,8 +62,8 @@ Answer: yes 3) Host B replies to the MLD query with an MLD Report for <MC-LL-B> 3.1) br0 on node Y learns that a listener for <MC-LL-B> is behind eth0 and then forwards the MLD Report further towards the querier on br0 - but not to bat0 - as required by RFC4541 3.2) batman-adv on node Y learns about the listener for <MC-LL-B> through the export of the bridge and then adds it to TT, which gets distributed to other nodes. -3.3) No matter if enabling or disabling the batman-adv multicast_rtr_only option node bat0 on node Y will not have received an MLD Report -3.4) batman-adv on nodes X learns about <MC-LL-B> through the TT +3.3) No matter if enabling or disabling the batman-adv multicast_rtr_only option bat0 on node Y will not have received an MLD Report +3.4) batman-adv on node X learns about <MC-LL-B> through the TT **Multicast packet forwarding:**

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (545edc8a)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 545edc8a1f7d1b12a27c0a113e45ed4a3d6c9e12 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 21:01:00 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- 545edc8a1f7d1b12a27c0a113e45ed4a3d6c9e12 batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index 05308ccc..e151335f 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -31,7 +31,7 @@ Answer: yes 3) Host B replies to the MLD query with an MLD Report for <MC-LL-B> 3.1) br0 on node Y learns that a listener for <MC-LL-B> is behind eth0 and then forwards the MLD Report further towards the querier on bat0, as required by RFC4541 3.2) batman-adv on node Y learns about the listener for <MC-LL-B> through the export of the bridge and then adds it to TT, which gets distributed to other nodes. -3.3) With the batman-adv multicast_rtr_only option enabled batman-adv will refrain to forward the MLD Report further into the mesh +3.3) With the batman-adv multicast_rtr_only option enabled batman-adv on node Y will refrain to forward the MLD Report further into the mesh 3.4) batman-adv on nodes X and Z learn about <MC-LL-B> through the TT **Multicast packet forwarding:**

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (09c9f6b3)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 09c9f6b374eacdf4cdfeddec9564d963cf111fc6 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 20:09:06 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- 09c9f6b374eacdf4cdfeddec9564d963cf111fc6 .../Multicast-IGMP-MLD-Report-Forwarding.textile | 25 ++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index d2042b10..4d91a64f 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -13,12 +13,33 @@ Currently batman-adv forwards/floods an IGMP/MLD Report to all other nodes by de h3. Scenario A: Multicast to host on node without querier +h4. Scenario A, Overview: + !mld-to-mcast-routers-only-scenario-A-overview.png! +_Can bridged-in host A send multicast to bridged-in host B?_ + +h4. Scenario A, Analysis: + +!mld-to-mcast-routers-only-scenario-A.png! h3. Scenario B: Multicast to host on node with a querier -!mld-to-mcast-routers-only-scenario-A-overview.png! +h4. Scenario B, Overview: + +!mld-to-mcast-routers-only-scenario-B-overview.png! +_Can bridged-in host A send multicast to bridged-in host B?_ + +h4. Scenario B, Analysis: + +!mld-to-mcast-routers-only-scenario-B.png! h3. Scenario C: Multicast from host on node with a querier -!mld-to-mcast-routers-only-scenario-A-overview.png! \ No newline at end of file +h4. Scenario C, Overview: + +!mld-to-mcast-routers-only-scenario-C-overview.png! +_Can bridged-in host B send multicast to bridged-in host A?_ + +h4. Scenario C, Analysis: + +!mld-to-mcast-routers-only-scenario-C.png! \ No newline at end of file

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (3149965b)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 3149965bd55f1a0a127d55be97375477da4beef9 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 20:11:34 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- 3149965bd55f1a0a127d55be97375477da4beef9 batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index 4d91a64f..e9b18afd 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -20,6 +20,8 @@ _Can bridged-in host A send multicast to bridged-in host B?_ h4. Scenario A, Analysis: +Answer: yes + !mld-to-mcast-routers-only-scenario-A.png! h3. Scenario B: Multicast to host on node with a querier @@ -31,6 +33,8 @@ _Can bridged-in host A send multicast to bridged-in host B?_ h4. Scenario B, Analysis: +Answer: yes + !mld-to-mcast-routers-only-scenario-B.png! h3. Scenario C: Multicast from host on node with a querier @@ -42,4 +46,6 @@ _Can bridged-in host B send multicast to bridged-in host A?_ h4. Scenario C, Analysis: +Answer: no + !mld-to-mcast-routers-only-scenario-C.png! \ No newline at end of file

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (639619cc)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 639619cc8aa37366aa513a6bf4d685aa7886cdd4 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 20:19:09 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- 639619cc8aa37366aa513a6bf4d685aa7886cdd4 batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index e9b18afd..1fbae8dd 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -49,3 +49,9 @@ h4. Scenario C, Analysis: Answer: no !mld-to-mcast-routers-only-scenario-C.png! + +Potential Workarounds: + +A) Set bridge port _multicast_router_ setting for bat0 to 2 (e.g.: _$ echo 2 > /sys/class/net/bat0/brport/multicast_router_) => always forwards multicast packets to bat0 +B) Send report not just to multicast routers, but also to queriers (not implemented) +C) Export batman-adv TT-global to bridge MDB (not implemented) \ No newline at end of file

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (f0e288b8)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit f0e288b82cbc4abbb8a9d14318dccf96eee08c91 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 20:42:08 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- f0e288b82cbc4abbb8a9d14318dccf96eee08c91 .../Multicast-IGMP-MLD-Report-Forwarding.textile | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index 1fbae8dd..590d7f0a 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -24,6 +24,24 @@ Answer: yes !mld-to-mcast-routers-only-scenario-A.png! +**Learning:** + +1) Bridged-in host B listens to a link-local multicast address <MC-LL-B> +2) Node Z floods an MLD Query through the mesh +3) Host B replies to the MLD query with an MLD Report for <MC-LL-B> +3.1) br0 on node Y learns that a listener for <MC-LL-B> is behind eth0 and then forwards the MLD Report further towards the querier on bat0, as required by RFC4541 +3.2) batman-adv on node Y learns about the listener for <MC-LL-B> through the export of the bridge and then adds it to TT, which gets distributed to other nodes. +3.3) With the batman-adv multicast_rtr_only option enabled batman-adv will refrain to forward the MLD Report further into the mesh +3.4) batman-adv on nodes X and Z learn about <MC-LL-B> through the TT + +**Multicast packet forwarding:** + +4) Bridged-in host A sends a multicast packet to the multicast address <MC-LL-B> +4.1) br0 on node X has not heard of <MC-LL-B>, but will forward the multicast packet towards the MLD Querier, as required by RFC4541 +4.2) batman-adv on node X had previously learned through the TT that <MC-LL-B> has a listener on node Y and batman-adv will therefore forward the multicast packet to node Y +4.3) br0 on node Y has previously learned about <MC-LL-B> through the MLD Report, so it forwards the multicast packet on eth0 to host B +4.4) host B successfully receives the multicast packet! + h3. Scenario B: Multicast to host on node with a querier h4. Scenario B, Overview:

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (a663bfd5)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit a663bfd5c68a95fcb5894c23b81beefd6f257c83 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 20:45:41 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- a663bfd5c68a95fcb5894c23b81beefd6f257c83 batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index 590d7f0a..6285721b 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -40,7 +40,7 @@ Answer: yes 4.1) br0 on node X has not heard of <MC-LL-B>, but will forward the multicast packet towards the MLD Querier, as required by RFC4541 4.2) batman-adv on node X had previously learned through the TT that <MC-LL-B> has a listener on node Y and batman-adv will therefore forward the multicast packet to node Y 4.3) br0 on node Y has previously learned about <MC-LL-B> through the MLD Report, so it forwards the multicast packet on eth0 to host B -4.4) host B successfully receives the multicast packet! +4.4) Host B successfully receives the multicast packet from host A! h3. Scenario B: Multicast to host on node with a querier

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[doc] backup-redmine,main: doc: batman-adv/mld-to-mcast-routers-only-scenario-B-overview.png (f0c20969)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit f0c209698567ba33c453a4e040808e1828f67561 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 20:01:40 2024 +0000 doc: batman-adv/mld-to-mcast-routers-only-scenario-B-overview.png >--------------------------------------------------------------- f0c209698567ba33c453a4e040808e1828f67561 .../mld-to-mcast-routers-only-scenario-B-overview.png | Bin 0 -> 42258 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/mld-to-mcast-routers-only-scenario-B-overview.png b/batman-adv/mld-to-mcast-routers-only-scenario-B-overview.png new file mode 100644 index 00000000..176dd262 Binary files /dev/null and b/batman-adv/mld-to-mcast-routers-only-scenario-B-overview.png differ

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[doc] backup-redmine,main: doc: batman-adv/mld-to-mcast-routers-only-scenario-A-overview.png (b67551a4)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit b67551a4a2431e8fbebb4aa099666b4f0171abd2 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 20:01:40 2024 +0000 doc: batman-adv/mld-to-mcast-routers-only-scenario-A-overview.png >--------------------------------------------------------------- b67551a4a2431e8fbebb4aa099666b4f0171abd2 .../mld-to-mcast-routers-only-scenario-A-overview.png | Bin 0 -> 47226 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/mld-to-mcast-routers-only-scenario-A-overview.png b/batman-adv/mld-to-mcast-routers-only-scenario-A-overview.png new file mode 100644 index 00000000..a55994ef Binary files /dev/null and b/batman-adv/mld-to-mcast-routers-only-scenario-A-overview.png differ

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commits May 2024