B.A.T.M.A.N September 2017

b.a.t.m.a.n@lists.open-mesh.org

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7 discussions

[B.A.T.M.A.N.] [PATCH] batman-adv: handle race condition for claims also in batadv_bla_rx
by Simon Wunderlich 02 Jul '19

02 Jul '19

From: Andreas Pape <apape(a)phoenixcontact.com> Like in the case of the patch for batadv_bla_tx to handle a race condition when claiming a mac address for bla, a similar situation can occur when claiming is triggered via batadv_bla_rx. This patch solves this with a similar approach as for batadv_bla_tx. Signed-off-by: Andreas Pape <apape(a)phoenixcontact.com> --- net/batman-adv/bridge_loop_avoidance.c | 31 ++++++++++++++++++++----------- net/batman-adv/translation-table.c | 26 ++++++++++++++++++++++++++ net/batman-adv/translation-table.h | 3 +++ 3 files changed, 49 insertions(+), 11 deletions(-) diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c index d07e89e..cab8980 100644 --- a/net/batman-adv/bridge_loop_avoidance.c +++ b/net/batman-adv/bridge_loop_avoidance.c @@ -1847,19 +1847,28 @@ bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, if (!claim) { /* possible optimization: race for a claim */ - /* No claim exists yet, claim it for us! + /* Make sure this packet is not looping back + * from our own backbone. */ - batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_rx(): Unclaimed MAC %pM found. Claim it. Local: %s\n", - ethhdr->h_source, - batadv_is_my_client(bat_priv, - ethhdr->h_source, vid) ? - "yes" : "no"); - batadv_handle_claim(bat_priv, primary_if, - primary_if->net_dev->dev_addr, - ethhdr->h_source, vid); - goto allow; + if (batadv_tt_local_has_timed_out(bat_priv, ethhdr->h_source, + vid, 100)) { + /* No claim exists yet, claim it for us! + */ + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "bla_rx(): Unclaimed MAC %pM found. Claim it. Local: %s\n", + ethhdr->h_source, + batadv_is_my_client(bat_priv, + ethhdr->h_source, vid) ? + "yes" : "no"); + + batadv_handle_claim(bat_priv, primary_if, + primary_if->net_dev->dev_addr, + ethhdr->h_source, vid); + goto allow; + } else { + goto handled; + } } /* if it is our own claim ... */ diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index e75b493..b908195 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -4380,3 +4380,29 @@ void batadv_tt_cache_destroy(void) kmem_cache_destroy(batadv_tt_req_cache); kmem_cache_destroy(batadv_tt_roam_cache); } + +bool batadv_tt_local_has_timed_out(struct batadv_priv *bat_priv, + const u8 *addr, unsigned short vid, + unsigned int timeout) +{ + struct batadv_tt_local_entry *tt_local_entry; + bool ret = true; + + tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid); + if (!tt_local_entry) + goto out; + /* Check if the client has been logically deleted (but is kept for + * consistency purpose) + */ + if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || + (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) + goto out; + /* Check that the tt_local_entry has a certain age */ + if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout)) + ret = false; + +out: + if (tt_local_entry) + batadv_tt_local_entry_put(tt_local_entry); + return ret; +} diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h index 411d586..b05d0d8 100644 --- a/net/batman-adv/translation-table.h +++ b/net/batman-adv/translation-table.h @@ -65,5 +65,8 @@ bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv, int batadv_tt_cache_init(void); void batadv_tt_cache_destroy(void); +bool batadv_tt_local_has_timed_out(struct batadv_priv *bat_priv, + const u8 *addr, unsigned short vid, + unsigned int timeout); #endif /* _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ */ -- 1.7.0.4

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[B.A.T.M.A.N.] [PATCH 00/17] pull request for net-next: batman-adv 2016-10-27
by Simon Wunderlich 04 Aug '18

04 Aug '18

Hi David, this is our first feature pull request for batman-adv (mostly containing code cleanup stuff), there are at least two more to come. Please pull or let me know of any problem! Thank you, Simon The following changes since commit 29fbff8698fc0ac1a1d74584b258e0bf18b469f9: Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (2016-10-13 21:40:23 -0700) are available in the git repository at: git://git.open-mesh.org/linux-merge.git tags/batadv-next-for-davem-20161027 for you to fetch changes up to 4c7da0f6dbcde2431d773ce03cde5e7abede54e0: batman-adv: Avoid precedence issues in macros (2016-10-19 08:37:54 +0200) ---------------------------------------------------------------- This code cleanup patchset includes the following changes (chronological order): - bump version strings, by Simon Wunderlich - README updates/clean up, by Sven Eckelmann (4 patches) - Code clean up and restructuring by Sven Eckelmann (2 patches) - Kerneldoc fix in forw_packet structure, by Linus Luessing - Remove unused argument in dbg_arp, by Antonio Quartulli - Add support to build batman-adv without wireless, by Linus Luessing - Restructure error handling for is_ap_isolated, by Markus Elfring - Remove unused initialization in various functions, by Sven Eckelmann - Use better names for fragment and gateway list heads, by Sven Eckelmann (2 patches) - Convert to octal permissions for files, by Sven Eckelmann - Avoid precedence issues for some macros, by Sven Eckelmann ---------------------------------------------------------------- Antonio Quartulli (1): batman-adv: remove unsed argument from batadv_dbg_arp() function Linus Lüssing (2): batman-adv: fix batadv_forw_packet kerneldoc for list attribute batman-adv: Allow selecting BATMAN V if CFG80211 is not built Markus Elfring (1): batman-adv: Less function calls in batadv_is_ap_isolated() after error detection Simon Wunderlich (1): batman-adv: Start new development cycle Sven Eckelmann (12): batman-adv: Add B.A.T.M.A.N. V sysfs files to README batman-adv: Add network_coding and mcast sysfs files to README batman-adv: Add dat, mcast, nc and neighbor debugfs files to README batman-adv: Document new nc, mcast and tpmeter log levels batman-adv: Remove unused function batadv_hash_delete batman-adv: Move batadv_sum_counter to soft-interface.c batman-adv: Remove unused batadv_icmp_user_cmd_type batman-adv: Remove needless init of variables on stack batman-adv: Use proper name for fragments list head batman-adv: Use proper name for gateway list head batman-adv: Use octal permissions instead of macros batman-adv: Avoid precedence issues in macros Documentation/networking/batman-adv.txt | 35 ++++++++++++---------- net/batman-adv/Kconfig | 2 +- net/batman-adv/bat_iv_ogm.c | 6 ++-- net/batman-adv/bat_v.c | 8 ++--- net/batman-adv/bat_v_ogm.c | 4 +-- net/batman-adv/debugfs.c | 26 ++++++++-------- net/batman-adv/distributed-arp-table.c | 17 ++++------- net/batman-adv/fragmentation.c | 18 +++++------ net/batman-adv/fragmentation.h | 2 +- net/batman-adv/gateway_client.c | 9 +++--- net/batman-adv/hash.h | 30 ------------------- net/batman-adv/icmp_socket.c | 5 ++-- net/batman-adv/log.c | 4 +-- net/batman-adv/log.h | 12 ++++---- net/batman-adv/main.c | 2 +- net/batman-adv/main.h | 27 ++--------------- net/batman-adv/network-coding.c | 8 ++--- net/batman-adv/originator.c | 10 +++---- net/batman-adv/packet.h | 12 +------- net/batman-adv/send.c | 2 +- net/batman-adv/soft-interface.c | 21 +++++++++++++ net/batman-adv/sysfs.c | 53 ++++++++++++++------------------- net/batman-adv/translation-table.c | 25 +++++++--------- net/batman-adv/types.h | 16 +++++----- 24 files changed, 149 insertions(+), 205 deletions(-)

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Re: [B.A.T.M.A.N.] limit of if per batman
by Sven Eckelmann 03 Feb '18

03 Feb '18

On Mittwoch, 25. Januar 2017 03:18:10 CET jens wrote: > On 24.01.2017 14:39, Sven Eckelmann wrote: > > There is no artificial limit added by batman-adv. But transmitting a lot of > > broadcasts over 255 virtual links sharing the same physical link > > might get interesting (independent of batman-adv). > > this made me curious , and i modified your script a bit - turns out > after the 127. IF you add to batman-adv you get an Error - > all 510 gretap links was succesfully build ... > # ifconfig |grep gre| wc -l > 515 > # batctl if|sort|wc -l > 127 > the error is mainly > *Error - can't write to file > '/sys/class/net/gre128/batman_adv/mesh_iface': Cannot allocate memory [...] > [113990.684947] [<ffffffff8107c16e>] ? __warn+0xbe/0xe0 [113990.684955] > [<ffffffffc017a804>] ? batadv_orig_hash_add_if+0x94/0x140 [batman_adv] > [113990.684961] [<ffffffff811a7b10>] ? kmalloc_slab+0x90/0xa0 > [113990.684966] [<ffffffff811e08c5>] ? __kmalloc+0x25/0x580 > [113990.684971] [<ffffffff815ef9d7>] ? _raw_spin_lock_irqsave+0x17/0x39 > [113990.684977] [<ffffffff81432c11>] ? _crng_backtrack_protect+0x31/0x70 > [113990.684981] [<ffffffff811e0ebc>] ? kmem_cache_alloc_trace+0x9c/0x540 > [113990.684986] [<ffffffff814340b7>] ? get_random_bytes+0xe7/0x1c0 > [113990.684991] [<ffffffffc017a804>] ? [...] I would guess that your system mostly fails becauseit cannot handle the allocation of the "large" arrays which store: * @bcast_own: set of bitfields (one per hard-interface) where each one counts * the number of our OGMs this orig_node rebroadcasted "back" to us (relative * to last_real_seqno). Every bitfield is BATADV_TQ_LOCAL_WINDOW_SIZE bits long. * @bcast_own_sum: sum of bcast_own Kind regards, Sven

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[B.A.T.M.A.N.] [PATCH] batman-adv: Deinline batadv_orig_hash_find, save 9024 bytes
by Denys Vlasenko 23 Oct '17

23 Oct '17

This function compiles to 473 bytes of machine code. 21 callsites. text data bss dec hex filename 95903266 20860288 35991552 152755106 91adba2 vmlinux_before 95894242 20860288 35991552 152746082 91ab862 vmlinux Signed-off-by: Denys Vlasenko <dvlasenk(a)redhat.com> CC: Marek Lindner <mareklindner(a)neomailbox.ch> CC: Simon Wunderlich <sw(a)simonwunderlich.de> CC: Antonio Quartulli <a(a)unstable.cc> CC: Sven Eckelmann <sven(a)narfation.org> CC: b.a.t.m.a.n(a)lists.open-mesh.org CC: linux-kernel(a)vger.kernel.org --- net/batman-adv/originator.c | 29 +++++++++++++++++++++++++++++ net/batman-adv/originator.h | 31 ++----------------------------- 2 files changed, 31 insertions(+), 29 deletions(-) diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c index e4cbb07..bcf78f1 100644 --- a/net/batman-adv/originator.c +++ b/net/batman-adv/originator.c @@ -47,6 +47,36 @@ /* hash class keys */ static struct lock_class_key batadv_orig_hash_lock_class_key; +struct batadv_orig_node * +batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; + int index; + + if (!hash) + return NULL; + + index = batadv_choose_orig(data, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + if (!batadv_compare_eth(orig_node, data)) + continue; + + if (!kref_get_unless_zero(&orig_node->refcount)) + continue; + + orig_node_tmp = orig_node; + break; + } + rcu_read_unlock(); + + return orig_node_tmp; +} + static void batadv_purge_orig(struct work_struct *work); /** diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h index 4e8b67f..db7a87d 100644 --- a/net/batman-adv/originator.h +++ b/net/batman-adv/originator.h @@ -96,34 +96,7 @@ static inline u32 batadv_choose_orig(const void *data, u32 size) return hash % size; } -static inline struct batadv_orig_node * -batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) -{ - struct batadv_hashtable *hash = bat_priv->orig_hash; - struct hlist_head *head; - struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; - int index; - - if (!hash) - return NULL; - - index = batadv_choose_orig(data, hash->size); - head = &hash->table[index]; - - rcu_read_lock(); - hlist_for_each_entry_rcu(orig_node, head, hash_entry) { - if (!batadv_compare_eth(orig_node, data)) - continue; - - if (!kref_get_unless_zero(&orig_node->refcount)) - continue; - - orig_node_tmp = orig_node; - break; - } - rcu_read_unlock(); - - return orig_node_tmp; -} +struct batadv_orig_node * +batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data); #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */ -- 1.8.1.4

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[B.A.T.M.A.N.] [PATCH] batman-adv: Add argument names for function ptr definitions
by Sven Eckelmann 30 Sep '17

30 Sep '17

checkpatch started to report unnamed arguments in function pointer definitions. Add the corresponding names to these definitions to avoid this warning. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- net/batman-adv/main.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 033819ae..4daed7ad 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -73,8 +73,8 @@ * list traversals just rcu-locked */ struct list_head batadv_hardif_list; -static int (*batadv_rx_handler[256])(struct sk_buff *, - struct batadv_hard_iface *); +static int (*batadv_rx_handler[256])(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; @@ -540,8 +540,8 @@ batadv_recv_handler_register(u8 packet_type, int (*recv_handler)(struct sk_buff *, struct batadv_hard_iface *)) { - int (*curr)(struct sk_buff *, - struct batadv_hard_iface *); + int (*curr)(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); curr = batadv_rx_handler[packet_type]; if (curr != batadv_recv_unhandled_packet && -- 2.11.0

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[B.A.T.M.A.N.] [PATCH] batman-adv: Remove useless function skb_header_release
by Sven Eckelmann 27 Sep '17

27 Sep '17

From: Gao Feng <gfree.wind(a)vip.163.com> There is no one which would invokes the function skb_header_release. So just remove it now. Signed-off-by: Gao Feng <gfree.wind(a)vip.163.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- This patch was already accepted by David and should be applied directly after the release of batman-adv 2017.3. And yes, I know that this line is too long now net/batman-adv/soft-interface.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 10f7edfb..c2c98674 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -69,7 +69,7 @@ int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) int result; /* TODO: We must check if we can release all references to non-payload - * data using skb_header_release in our skbs to allow skb_cow_header to + * data using __skb_header_release in our skbs to allow skb_cow_header to * work optimally. This means that those skbs are not allowed to read * or write any data which is before the current position of skb->data * after that call and thus allow other skbs with the same data buffer -- 2.11.0

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[B.A.T.M.A.N.] [PATCH] batman-adv: Convert batman-adv.txt to reStructuredText
by Sven Eckelmann 19 Sep '17

19 Sep '17

Converting the freeform text to parsable reStructuredText, allows the integration in the sphinx based documentation system of the kernel. It will therefore be accessible as hypertext under https://www.kernel.org/doc/html/latest/ Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- Documentation/networking/00-INDEX | 2 - Documentation/networking/batman-adv.rst | 220 ++++++++++++++++++++++++++++++++ Documentation/networking/batman-adv.txt | 215 ------------------------------- Documentation/networking/index.rst | 1 + MAINTAINERS | 2 +- 5 files changed, 222 insertions(+), 218 deletions(-) create mode 100644 Documentation/networking/batman-adv.rst delete mode 100644 Documentation/networking/batman-adv.txt diff --git a/Documentation/networking/00-INDEX b/Documentation/networking/00-INDEX index c6beb5f1637f..7a79b3587dd3 100644 --- a/Documentation/networking/00-INDEX +++ b/Documentation/networking/00-INDEX @@ -30,8 +30,6 @@ atm.txt - info on where to get ATM programs and support for Linux. ax25.txt - info on using AX.25 and NET/ROM code for Linux -batman-adv.txt - - B.A.T.M.A.N routing protocol on top of layer 2 Ethernet Frames. baycom.txt - info on the driver for Baycom style amateur radio modems bonding.txt diff --git a/Documentation/networking/batman-adv.rst b/Documentation/networking/batman-adv.rst new file mode 100644 index 000000000000..a342b2cc3dc6 --- /dev/null +++ b/Documentation/networking/batman-adv.rst @@ -0,0 +1,220 @@ +========== +batman-adv +========== + +Batman advanced is a new approach to wireless networking which does no longer +operate on the IP basis. Unlike the batman daemon, which exchanges information +using UDP packets and sets routing tables, batman-advanced operates on ISO/OSI +Layer 2 only and uses and routes (or better: bridges) Ethernet Frames. It +emulates a virtual network switch of all nodes participating. Therefore all +nodes appear to be link local, thus all higher operating protocols won't be +affected by any changes within the network. You can run almost any protocol +above batman advanced, prominent examples are: IPv4, IPv6, DHCP, IPX. + +Batman advanced was implemented as a Linux kernel driver to reduce the overhead +to a minimum. It does not depend on any (other) network driver, and can be used +on wifi as well as ethernet lan, vpn, etc ... (anything with ethernet-style +layer 2). + + +Configuration +============= + +Load the batman-adv module into your kernel:: + + $ insmod batman-adv.ko + +The module is now waiting for activation. You must add some interfaces on which +batman can operate. After loading the module batman advanced will scan your +systems interfaces to search for compatible interfaces. Once found, it will +create subfolders in the ``/sys`` directories of each supported interface, +e.g.:: + + $ ls /sys/class/net/eth0/batman_adv/ + elp_interval iface_status mesh_iface throughput_override + +If an interface does not have the ``batman_adv`` subfolder, it probably is not +supported. Not supported interfaces are: loopback, non-ethernet and batman's +own interfaces. + +Note: After the module was loaded it will continuously watch for new +interfaces to verify the compatibility. There is no need to reload the module +if you plug your USB wifi adapter into your machine after batman advanced was +initially loaded. + +The batman-adv soft-interface can be created using the iproute2 tool ``ip``:: + + $ ip link add name bat0 type batadv + +To activate a given interface simply attach it to the ``bat0`` interface:: + + $ ip link set dev eth0 master bat0 + +Repeat this step for all interfaces you wish to add. Now batman starts +using/broadcasting on this/these interface(s). + +By reading the "iface_status" file you can check its status:: + + $ cat /sys/class/net/eth0/batman_adv/iface_status + active + +To deactivate an interface you have to detach it from the "bat0" interface:: + + $ ip link set dev eth0 nomaster + + +All mesh wide settings can be found in batman's own interface folder:: + + $ ls /sys/class/net/bat0/mesh/ + aggregated_ogms fragmentation isolation_mark routing_algo + ap_isolation gw_bandwidth log_level vlan0 + bonding gw_mode multicast_mode + bridge_loop_avoidance gw_sel_class network_coding + distributed_arp_table hop_penalty orig_interval + +There is a special folder for debugging information:: + + $ ls /sys/kernel/debug/batman_adv/bat0/ + bla_backbone_table log neighbors transtable_local + bla_claim_table mcast_flags originators + dat_cache nc socket + gateways nc_nodes transtable_global + +Some of the files contain all sort of status information regarding the mesh +network. For example, you can view the table of originators (mesh +participants) with:: + + $ cat /sys/kernel/debug/batman_adv/bat0/originators + +Other files allow to change batman's behaviour to better fit your requirements. +For instance, you can check the current originator interval (value in +milliseconds which determines how often batman sends its broadcast packets):: + + $ cat /sys/class/net/bat0/mesh/orig_interval + 1000 + +and also change its value:: + + $ echo 3000 > /sys/class/net/bat0/mesh/orig_interval + +In very mobile scenarios, you might want to adjust the originator interval to a +lower value. This will make the mesh more responsive to topology changes, but +will also increase the overhead. + + +Usage +===== + +To make use of your newly created mesh, batman advanced provides a new +interface "bat0" which you should use from this point on. All interfaces added +to batman advanced are not relevant any longer because batman handles them for +you. Basically, one "hands over" the data by using the batman interface and +batman will make sure it reaches its destination. + +The "bat0" interface can be used like any other regular interface. It needs an +IP address which can be either statically configured or dynamically (by using +DHCP or similar services):: + + NodeA: ip link set up dev bat0 + NodeA: ip addr add 192.168.0.1/24 dev bat0 + + NodeB: ip link set up dev bat0 + NodeB: ip addr add 192.168.0.2/24 dev bat0 + NodeB: ping 192.168.0.1 + +Note: In order to avoid problems remove all IP addresses previously assigned to +interfaces now used by batman advanced, e.g.:: + + $ ip addr flush dev eth0 + + +Logging/Debugging +================= + +All error messages, warnings and information messages are sent to the kernel +log. Depending on your operating system distribution this can be read in one of +a number of ways. Try using the commands: ``dmesg``, ``logread``, or looking in +the files ``/var/log/kern.log`` or ``/var/log/syslog``. All batman-adv messages +are prefixed with "batman-adv:" So to see just these messages try:: + + $ dmesg | grep batman-adv + +When investigating problems with your mesh network, it is sometimes necessary to +see more detail debug messages. This must be enabled when compiling the +batman-adv module. When building batman-adv as part of kernel, use "make +menuconfig" and enable the option ``B.A.T.M.A.N. debugging`` +(``CONFIG_BATMAN_ADV_DEBUG=y``). + +Those additional debug messages can be accessed using a special file in +debugfs:: + + $ cat /sys/kernel/debug/batman_adv/bat0/log + +The additional debug output is by default disabled. It can be enabled during +run time. Following log_levels are defined: + +.. flat-table:: + + * - 0 + - All debug output disabled + * - 1 + - Enable messages related to routing / flooding / broadcasting + * - 2 + - Enable messages related to route added / changed / deleted + * - 4 + - Enable messages related to translation table operations + * - 8 + - Enable messages related to bridge loop avoidance + * - 16 + - Enable messages related to DAT, ARP snooping and parsing + * - 32 + - Enable messages related to network coding + * - 64 + - Enable messages related to multicast + * - 128 + - Enable messages related to throughput meter + * - 255 + - Enable all messages + +The debug output can be changed at runtime using the file +``/sys/class/net/bat0/mesh/log_level``. e.g.:: + + $ echo 6 > /sys/class/net/bat0/mesh/log_level + +will enable debug messages for when routes change. + +Counters for different types of packets entering and leaving the batman-adv +module are available through ethtool:: + + $ ethtool --statistics bat0 + + +batctl +====== + +As batman advanced operates on layer 2, all hosts participating in the virtual +switch are completely transparent for all protocols above layer 2. Therefore +the common diagnosis tools do not work as expected. To overcome these problems, +batctl was created. At the moment the batctl contains ping, traceroute, tcpdump +and interfaces to the kernel module settings. + +For more information, please see the manpage (``man batctl``). + +batctl is available on https://www.open-mesh.org/ + + +Contact +======= + +Please send us comments, experiences, questions, anything :) + +IRC: + #batman on irc.freenode.org +Mailing-list: + b.a.t.m.a.n(a)open-mesh.org (optional subscription at + https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n) + +You can also contact the Authors: + +* Marek Lindner <mareklindner(a)neomailbox.ch> +* Simon Wunderlich <sw(a)simonwunderlich.de> diff --git a/Documentation/networking/batman-adv.txt b/Documentation/networking/batman-adv.txt deleted file mode 100644 index ccf94677b240..000000000000 --- a/Documentation/networking/batman-adv.txt +++ /dev/null @@ -1,215 +0,0 @@ -BATMAN-ADV ----------- - -Batman advanced is a new approach to wireless networking which -does no longer operate on the IP basis. Unlike the batman daemon, -which exchanges information using UDP packets and sets routing -tables, batman-advanced operates on ISO/OSI Layer 2 only and uses -and routes (or better: bridges) Ethernet Frames. It emulates a -virtual network switch of all nodes participating. Therefore all -nodes appear to be link local, thus all higher operating proto- -cols won't be affected by any changes within the network. You can -run almost any protocol above batman advanced, prominent examples -are: IPv4, IPv6, DHCP, IPX. - -Batman advanced was implemented as a Linux kernel driver to re- -duce the overhead to a minimum. It does not depend on any (other) -network driver, and can be used on wifi as well as ethernet lan, -vpn, etc ... (anything with ethernet-style layer 2). - - -CONFIGURATION -------------- - -Load the batman-adv module into your kernel: - -# insmod batman-adv.ko - -The module is now waiting for activation. You must add some in- -terfaces on which batman can operate. After loading the module -batman advanced will scan your systems interfaces to search for -compatible interfaces. Once found, it will create subfolders in -the /sys directories of each supported interface, e.g. - -# ls /sys/class/net/eth0/batman_adv/ -# elp_interval iface_status mesh_iface throughput_override - -If an interface does not have the "batman_adv" subfolder it prob- -ably is not supported. Not supported interfaces are: loopback, -non-ethernet and batman's own interfaces. - -Note: After the module was loaded it will continuously watch for -new interfaces to verify the compatibility. There is no need to -reload the module if you plug your USB wifi adapter into your ma- -chine after batman advanced was initially loaded. - -The batman-adv soft-interface can be created using the iproute2 -tool "ip" - -# ip link add name bat0 type batadv - -To activate a given interface simply attach it to the "bat0" -interface - -# ip link set dev eth0 master bat0 - -Repeat this step for all interfaces you wish to add. Now batman -starts using/broadcasting on this/these interface(s). - -By reading the "iface_status" file you can check its status: - -# cat /sys/class/net/eth0/batman_adv/iface_status -# active - -To deactivate an interface you have to detach it from the -"bat0" interface: - -# ip link set dev eth0 nomaster - - -All mesh wide settings can be found in batman's own interface -folder: - -# ls /sys/class/net/bat0/mesh/ -# aggregated_ogms fragmentation isolation_mark routing_algo -# ap_isolation gw_bandwidth log_level vlan0 -# bonding gw_mode multicast_mode -# bridge_loop_avoidance gw_sel_class network_coding -# distributed_arp_table hop_penalty orig_interval - -There is a special folder for debugging information: - -# ls /sys/kernel/debug/batman_adv/bat0/ -# bla_backbone_table log neighbors transtable_local -# bla_claim_table mcast_flags originators -# dat_cache nc socket -# gateways nc_nodes transtable_global - -Some of the files contain all sort of status information regard- -ing the mesh network. For example, you can view the table of -originators (mesh participants) with: - -# cat /sys/kernel/debug/batman_adv/bat0/originators - -Other files allow to change batman's behaviour to better fit your -requirements. For instance, you can check the current originator -interval (value in milliseconds which determines how often batman -sends its broadcast packets): - -# cat /sys/class/net/bat0/mesh/orig_interval -# 1000 - -and also change its value: - -# echo 3000 > /sys/class/net/bat0/mesh/orig_interval - -In very mobile scenarios, you might want to adjust the originator -interval to a lower value. This will make the mesh more respon- -sive to topology changes, but will also increase the overhead. - - -USAGE ------ - -To make use of your newly created mesh, batman advanced provides -a new interface "bat0" which you should use from this point on. -All interfaces added to batman advanced are not relevant any -longer because batman handles them for you. Basically, one "hands -over" the data by using the batman interface and batman will make -sure it reaches its destination. - -The "bat0" interface can be used like any other regular inter- -face. It needs an IP address which can be either statically con- -figured or dynamically (by using DHCP or similar services): - -# NodeA: ip link set up dev bat0 -# NodeA: ip addr add 192.168.0.1/24 dev bat0 - -# NodeB: ip link set up dev bat0 -# NodeB: ip addr add 192.168.0.2/24 dev bat0 -# NodeB: ping 192.168.0.1 - -Note: In order to avoid problems remove all IP addresses previ- -ously assigned to interfaces now used by batman advanced, e.g. - -# ip addr flush dev eth0 - - -LOGGING/DEBUGGING ------------------ - -All error messages, warnings and information messages are sent to -the kernel log. Depending on your operating system distribution -this can be read in one of a number of ways. Try using the com- -mands: dmesg, logread, or looking in the files /var/log/kern.log -or /var/log/syslog. All batman-adv messages are prefixed with -"batman-adv:" So to see just these messages try - -# dmesg | grep batman-adv - -When investigating problems with your mesh network it is some- -times necessary to see more detail debug messages. This must be -enabled when compiling the batman-adv module. When building bat- -man-adv as part of kernel, use "make menuconfig" and enable the -option "B.A.T.M.A.N. debugging". - -Those additional debug messages can be accessed using a special -file in debugfs - -# cat /sys/kernel/debug/batman_adv/bat0/log - -The additional debug output is by default disabled. It can be en- -abled during run time. Following log_levels are defined: - - 0 - All debug output disabled - 1 - Enable messages related to routing / flooding / broadcasting - 2 - Enable messages related to route added / changed / deleted - 4 - Enable messages related to translation table operations - 8 - Enable messages related to bridge loop avoidance - 16 - Enable messages related to DAT, ARP snooping and parsing - 32 - Enable messages related to network coding - 64 - Enable messages related to multicast -128 - Enable messages related to throughput meter -255 - Enable all messages - -The debug output can be changed at runtime using the file -/sys/class/net/bat0/mesh/log_level. e.g. - -# echo 6 > /sys/class/net/bat0/mesh/log_level - -will enable debug messages for when routes change. - -Counters for different types of packets entering and leaving the -batman-adv module are available through ethtool: - -# ethtool --statistics bat0 - - -BATCTL ------- - -As batman advanced operates on layer 2 all hosts participating in -the virtual switch are completely transparent for all protocols -above layer 2. Therefore the common diagnosis tools do not work -as expected. To overcome these problems batctl was created. At -the moment the batctl contains ping, traceroute, tcpdump and -interfaces to the kernel module settings. - -For more information, please see the manpage (man batctl). - -batctl is available on https://www.open-mesh.org/ - - -CONTACT -------- - -Please send us comments, experiences, questions, anything :) - -IRC: #batman on irc.freenode.org -Mailing-list: b.a.t.m.a.n(a)open-mesh.org (optional subscription - at https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n) - -You can also contact the Authors: - -Marek Lindner <mareklindner(a)neomailbox.ch> -Simon Wunderlich <sw(a)simonwunderlich.de> diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst index b5bd87e01f52..66e620866245 100644 --- a/Documentation/networking/index.rst +++ b/Documentation/networking/index.rst @@ -6,6 +6,7 @@ Contents: .. toctree:: :maxdepth: 2 + batman-adv kapi z8530book diff --git a/MAINTAINERS b/MAINTAINERS index 2af3ab3f7702..62d216af5bd4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2481,7 +2481,7 @@ Q: https://patchwork.open-mesh.org/project/batman/list/ S: Maintained F: Documentation/ABI/testing/sysfs-class-net-batman-adv F: Documentation/ABI/testing/sysfs-class-net-mesh -F: Documentation/networking/batman-adv.txt +F: Documentation/networking/batman-adv.rst F: include/uapi/linux/batman_adv.h F: net/batman-adv/ -- 2.11.0

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