[B.A.T.M.A.N.] [PATCH] batman-adv: handle race condition for claims also in batadv_bla_rx
by Simon Wunderlich
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
1 year, 6 months
[B.A.T.M.A.N.] [PATCH 00/17] pull request for net-next: batman-adv 2016-10-27
by Simon Wunderlich
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(-)
2 years, 5 months
Re: [B.A.T.M.A.N.] limit of if per batman
by Sven Eckelmann
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
2 years, 11 months
[B.A.T.M.A.N.] [PATCH] batman-adv: Deinline batadv_orig_hash_find, save 9024 bytes
by Denys Vlasenko
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
3 years, 3 months
[B.A.T.M.A.N.] [batctl] compiling with gcc 7.1.0: there are some notes and warnings
by Philipp Psurek
Hi all,
it's nothing to worry about but since 2011 I always noticed a clean
compile run of your code. Now with gcc 7.1.0 there are some warnings
and notes that might interest you:
~ LANG=C make
CC bat-hosts.o
CC debugfs.o
CC debug.o
CC functions.o
CC genl.o
CC hash.o
CC icmp_helper.o
CC interface.o
CC ioctl.o
CC main.o
CC netlink.o
CC ping.o
CC sys.o
In file included from sys.c:37:0:
sys.c: In function 'handle_ra_setting':
sys.h:33:25: warning: '%s' directive output may be truncated writing up to 255 bytes into a region of size 185 [-Wformat-truncation=]
#define SYS_IFACE_PATH "/sys/class/net"
^
sys.h:38:30: note: in expansion of macro 'SYS_IFACE_PATH'
#define SYS_ROUTING_ALGO_FMT SYS_IFACE_PATH"/%s/mesh/routing_algo"
^~~~~~~~~~~~~~
sys.c:480:38: note: in expansion of macro 'SYS_ROUTING_ALGO_FMT'
snprintf(path_buff, PATH_BUFF_LEN, SYS_ROUTING_ALGO_FMT, iface_dir->d_name);
^~~~~~~~~~~~~~~~~~~~
sys.h:38:46: note: format string is defined here
#define SYS_ROUTING_ALGO_FMT SYS_IFACE_PATH"/%s/mesh/routing_algo"
^~
sys.c:480:3: note: 'snprintf' output between 34 and 289 bytes into a destination of size 200
snprintf(path_buff, PATH_BUFF_LEN, SYS_ROUTING_ALGO_FMT, iface_dir->d_name);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CC tcpdump.o
CC tp_meter.o
tp_meter.c: In function 'tp_meter':
tp_meter.c:502:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
printf("CANCEL received: test aborted\n");
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tp_meter.c:504:2: note: here
case BATADV_TP_REASON_COMPLETE:
^~~~
CC traceroute.o
CC translate.o
LD batctl
# batctl -v
batctl 2017.1-1-g3069ca8 [batman-adv: 2017.1-4-g2149d80d]
It's really nothing bad at all. gcc 7.1.0 is somehow a little bit
capricious but with more suggestions to make cleaner code.
best regards
Philipp
3 years, 7 months
[B.A.T.M.A.N.] [PATCH v2 0/6] batman-adv: broadcast packet aggregation
by Linus Lüssing
Hi,
Here is a first patchset to reintroduce aggregation support for BATMAN V, too -
as well as any other packet type with a broadcast destination.
Branch:
* https://git.open-mesh.org/batman-adv.git/shortlog/refs/heads/linus/aggreg...
Regards, Linus
PS: Requires: "batman-adv: Introduce packet type independent TVLV handler API"
(40e5c9e798ec, available on patchwork or linus/aggregation branch)
---
Changelog:
v2:
* reset skb->cb on the soft-iface reception path, too [PATCH 5/6]
(thanks Sven!)
RFC->v1:
* removed tvlv (un)pack ctx wrappers
* fixed a crash when deaggregating ARP packets
* now compile tested down to 3.2, too (no issues found)
* now stress tested with multicast traffic of a larger, public mesh setup
3 years, 7 months
[B.A.T.M.A.N.] [PATCH net] net: batman-adv: Fix possible memleaks when fail to register_netdevice
by gfree.wind＠foxmail.com
From: Gao Feng <fgao(a)ikuai8.com>
Because the func batadv_softif_init_late allocate some resources and
it would be invoked in register_netdevice. So we need to invoke the
func batadv_softif_free instead of free_netdev to cleanup when fail
to register_netdevice.
Signed-off-by: Gao Feng <fgao(a)ikuai8.com>
---
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 d042c99..90bf990 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -1011,7 +1011,7 @@ struct net_device *batadv_softif_create(struct net *net, const char *name)
if (ret < 0) {
pr_err("Unable to register the batman interface '%s': %i\n",
name, ret);
- free_netdev(soft_iface);
+ batadv_softif_free(soft_iface);
return NULL;
}
--
1.9.1
3 years, 7 months
[B.A.T.M.A.N.] MAC addresses of loop detect frames in global translation-table
by Andreas Pape
Hello,
I stumbled across some weired MAC addresses starting with ba:be in the
global translation-table when running batman-adv-2017.0.1. I run my setup
with bla enabled.
Most of the entries in the global tt of my devices consist of these mac
addresses. Looking through the code they come from frames which seem to be
used for loop detection. Adding such MAC addresses to the local tt is
prevented with the help of the batadv_bla_is_loopdetect_mac function. I
wonder why adding these macs to the global tt is not prevented in a
simliar way. Would it be possible to add a corresponding check to
batadv_tt_global_add to prevent these macs from being added to the global
tt? Or is there a specific reason why these mac addresses must occur in
the global tt and which I have not understood so far?
Best regards,
Andreas
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3 years, 8 months
[B.A.T.M.A.N.] [PATCH 0/5] alfred: TQ query optimizations
by Sven Eckelmann
Hi,
alfred uses the TQ from batman-adv to find its best alfred neighbor. This best
neighbor information is used by slave servers to request/publish data.
This is done for each server announcement packet by:
* requesting the global translation table (netlink or debugfs) and then
searching in it for the MAC address of the detected alfred server to find
its originator address
* requesting the originator table (netlink or debugfs) and then searching it
it for the originator address of the detected alfred server to find its TQ
value
This was previously done whenever a new announcement packet received by
alfred. We've observed that this can be a problem on networks with a lot of
master servers (~100) which can see each other, large translation tables and
slow CPUs. alfred still worked but the CPU load by alfred was rather high
(~20% on an 560MHz AR9344).
The idea is now to avoid this lookup for master servers. And (for slave
servers) to process all servers at once. This is done before the wants to push
its local data to a master server in an sync interval.
The process which was described earlier was now changed to:
* requesting the global translation table (netlink or debugfs) and then put
MAC address and corresponding originator address in tg hash
* requesting the originator table (netlink or debugfs) and then put
originator address and corresponding TQ value orig hash
* got through all servers:
- search in tg hash for for the MAC address of the alfred server to find
its originator address
- search in orig hash for for the originator address of the alfred server
to find its TQ value
These changes reduced the load on the previously mentioned devices
significantly.
Kind regards,
Sven
Sven Eckelmann (5):
alfred: Move alfred specific netlink code in separate file
alfred: Only query tq of remote master in slave mode
alfred: Check the TQ of master servers before pushing data
alfred: Cache the TQ values for each originator
alfred: Cache the global translation table entries
Makefile | 1 +
alfred.h | 1 -
batadv_query.c | 227 +++++++++++++++++++++++++++++++++++++++++--------------
batadv_query.h | 25 +++++-
batadv_querynl.c | 216 ++++++++++++++++++++++++++++++++++++++++++++++++++++
batadv_querynl.h | 34 +++++++++
netlink.c | 195 -----------------------------------------------
netlink.h | 7 --
recv.c | 15 +---
server.c | 56 +++++++++++++-
10 files changed, 501 insertions(+), 276 deletions(-)
create mode 100644 batadv_querynl.c
create mode 100644 batadv_querynl.h
3 years, 8 months
