B.A.T.M.A.N

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[B.A.T.M.A.N.] [PATCH 0/7] pull request for net: batman-adv 2018-03-02
by Simon Wunderlich 04 Mar '18

04 Mar '18

Hi David, here are some bugfixes which we would like to see integrated into net. Please pull or let me know of any problem! Thank you, Simon The following changes since commit 7928b2cbe55b2a410a0f5c1f154610059c57b1b2: Linux 4.16-rc1 (2018-02-11 15:04:29 -0800) are available in the git repository at: git://git.open-mesh.org/linux-merge.git tags/batadv-net-for-davem-20180302 for you to fetch changes up to f22e08932c2960f29b5e828e745c9f3fb7c1bb86: batman-adv: Fix internal interface indices types (2018-02-25 20:19:34 +0100) ---------------------------------------------------------------- Here are some batman-adv bugfixes: - fix skb checksum issues, by Matthias Schiffer (2 patches) - fix exception handling when dumping data objects through netlink, by Sven Eckelmann (4 patches) - fix handling of interface indices, by Sven Eckelmann ---------------------------------------------------------------- Matthias Schiffer (2): batman-adv: fix packet checksum in receive path batman-adv: invalidate checksum on fragment reassembly Sven Eckelmann (5): batman-adv: Ignore invalid batadv_iv_gw during netlink send batman-adv: Ignore invalid batadv_v_gw during netlink send batman-adv: Fix netlink dumping of BLA claims batman-adv: Fix netlink dumping of BLA backbones batman-adv: Fix internal interface indices types net/batman-adv/bat_iv_ogm.c | 26 +++++++++++++++----------- net/batman-adv/bat_v.c | 2 +- net/batman-adv/bridge_loop_avoidance.c | 22 ++++++++++++++-------- net/batman-adv/fragmentation.c | 3 ++- net/batman-adv/hard-interface.c | 9 +++++++-- net/batman-adv/originator.c | 4 ++-- net/batman-adv/originator.h | 4 ++-- net/batman-adv/soft-interface.c | 8 +------- net/batman-adv/types.h | 11 ++++++----- 9 files changed, 50 insertions(+), 39 deletions(-)

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[B.A.T.M.A.N.] [PATCH maint] batman-adv: Fix internal interface indices types
by Sven Eckelmann 26 Feb '18

26 Feb '18

batman-adv uses internal indices for each enabled and active interface. It is currently used by the B.A.T.M.A.N. IV algorithm to identifify the correct position in the ogm_cnt bitmaps. The type for the number of enabled interfaces (which defines the next interface index) was set to char. This type can be (depending on the architecture) either signed (limiting batman-adv to 127 active slave interfaces) or unsigned (limiting batman-adv to 255 active slave interfaces). This limit was not correctly checked when an interface was enabled and thus an overflow happened. This was only catched on systems with the signed char type when the B.A.T.M.A.N. IV code tried to resize its counter arrays with a negative size. The if_num interface index was only a s16 and therefore significantly smaller than the ifindex (int) used by the code net code. Both &batadv_hard_iface->if_num and &batadv_priv->num_ifaces must be (unsigned) int to support the same number of slave interfaces as the net core code. And the interface activation code must check the number of active slave interfaces to avoid integer overflows. Fixes: d1fbb61d0534 ("raw socket operations added: create / destroy / bind / send broadcast of own OGMs implemented orig interval configurable via /proc/net/batman-adv/orig_interval") Fixes: ea6f8d42a595 ("batman-adv: move /proc interface handling to /sys") Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- net/batman-adv/bat_iv_ogm.c | 24 ++++++++++++++---------- net/batman-adv/hard-interface.c | 9 +++++++-- net/batman-adv/originator.c | 4 ++-- net/batman-adv/originator.h | 4 ++-- net/batman-adv/types.h | 11 ++++++----- 5 files changed, 31 insertions(+), 21 deletions(-) diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 79e32638..ed4be9d3 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -157,7 +157,7 @@ static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) * Return: 0 on success, a negative error code otherwise. */ static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, - int max_if_num) + unsigned int max_if_num) { void *data_ptr; size_t old_size; @@ -201,7 +201,8 @@ static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, */ static void batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node, - int max_if_num, int del_if_num) + unsigned int max_if_num, + unsigned int del_if_num) { size_t chunk_size; size_t if_offset; @@ -239,7 +240,8 @@ batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node, */ static void batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node, - int max_if_num, int del_if_num) + unsigned int max_if_num, + unsigned int del_if_num) { size_t if_offset; void *data_ptr; @@ -276,7 +278,8 @@ batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node, * Return: 0 on success, a negative error code otherwise. */ static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, - int max_if_num, int del_if_num) + unsigned int max_if_num, + unsigned int del_if_num) { spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); @@ -311,7 +314,8 @@ static struct batadv_orig_node * batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr) { struct batadv_orig_node *orig_node; - int size, hash_added; + int hash_added; + size_t size; orig_node = batadv_orig_hash_find(bat_priv, addr); if (orig_node) @@ -893,7 +897,7 @@ batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) u32 i; size_t word_index; u8 *w; - int if_num; + unsigned int if_num; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; @@ -1023,7 +1027,7 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, struct batadv_neigh_node *tmp_neigh_node = NULL; struct batadv_neigh_node *router = NULL; struct batadv_orig_node *orig_node_tmp; - int if_num; + unsigned int if_num; u8 sum_orig, sum_neigh; u8 *neigh_addr; u8 tq_avg; @@ -1182,7 +1186,7 @@ static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, u8 total_count; u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; - int if_num; + unsigned int if_num; unsigned int tq_asym_penalty, inv_asym_penalty; unsigned int combined_tq; unsigned int tq_iface_penalty; @@ -1702,9 +1706,9 @@ static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, if (is_my_orig) { unsigned long *word; - int offset; + size_t offset; s32 bit_pos; - s16 if_num; + unsigned int if_num; u8 *weight; orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 5f186bff..68b54a39 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -763,6 +763,11 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, hard_iface->soft_iface = soft_iface; bat_priv = netdev_priv(hard_iface->soft_iface); + if (bat_priv->num_ifaces >= UINT_MAX) { + ret = -ENOSPC; + goto err_dev; + } + ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface, NULL, NULL, NULL); if (ret) @@ -876,7 +881,7 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface); /* nobody uses this interface anymore */ - if (!bat_priv->num_ifaces) { + if (bat_priv->num_ifaces == 0) { batadv_gw_check_client_stop(bat_priv); if (autodel == BATADV_IF_CLEANUP_AUTO) @@ -912,7 +917,7 @@ batadv_hardif_add_interface(struct net_device *net_dev) if (ret) goto free_if; - hard_iface->if_num = -1; + hard_iface->if_num = 0; hard_iface->net_dev = net_dev; hard_iface->soft_iface = NULL; hard_iface->if_status = BATADV_IF_NOT_IN_USE; diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c index 58a7d927..74782426 100644 --- a/net/batman-adv/originator.c +++ b/net/batman-adv/originator.c @@ -1569,7 +1569,7 @@ int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb) * Return: 0 on success or negative error number in case of failure */ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, - int max_if_num) + unsigned int max_if_num) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct batadv_algo_ops *bao = bat_priv->algo_ops; @@ -1611,7 +1611,7 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, * Return: 0 on success or negative error number in case of failure */ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, - int max_if_num) + unsigned int max_if_num) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct batadv_hashtable *hash = bat_priv->orig_hash; diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h index 8e543a3c..15d896b2 100644 --- a/net/batman-adv/originator.h +++ b/net/batman-adv/originator.h @@ -73,9 +73,9 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset); int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb); int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset); int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, - int max_if_num); + unsigned int max_if_num); int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, - int max_if_num); + unsigned int max_if_num); struct batadv_orig_node_vlan * batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, unsigned short vid); diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index bb157841..a5aa6d61 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -167,7 +167,7 @@ struct batadv_hard_iface { struct list_head list; /** @if_num: identificator of the interface */ - s16 if_num; + unsigned int if_num; /** @if_status: status of the interface for batman-adv */ char if_status; @@ -1596,7 +1596,7 @@ struct batadv_priv { atomic_t batman_queue_left; /** @num_ifaces: number of interfaces assigned to this mesh interface */ - char num_ifaces; + unsigned int num_ifaces; /** @mesh_obj: kobject for sysfs mesh subdirectory */ struct kobject *mesh_obj; @@ -2186,15 +2186,16 @@ struct batadv_algo_orig_ops { * orig_node due to a new hard-interface being added into the mesh * (optional) */ - int (*add_if)(struct batadv_orig_node *orig_node, int max_if_num); + int (*add_if)(struct batadv_orig_node *orig_node, + unsigned int max_if_num); /** * @del_if: ask the routing algorithm to apply the needed changes to the * orig_node due to an hard-interface being removed from the mesh * (optional) */ - int (*del_if)(struct batadv_orig_node *orig_node, int max_if_num, - int del_if_num); + int (*del_if)(struct batadv_orig_node *orig_node, + unsigned int max_if_num, unsigned int del_if_num); #ifdef CONFIG_BATMAN_ADV_DEBUGFS /** @print: print the originator table (optional) */ -- 2.11.0

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[B.A.T.M.A.N.] [PATCH maint] batman-adv: Only use compat.h for kernel builds
by Sven Eckelmann 26 Feb '18

26 Feb '18

The compat.h will be included by default via the -include gcc parameter. This is done by appending the incude information to NOSTDINC_FLAGS in the Makefile. But Debian decided [1] that this NOSTDINC_FLAGS must also be used when not compiling kernel sources. This for example happens when the gcc-version.sh script is executed. This results in error messages like In file included from <command-line>:0:0: /usr/src//batman-adv/build/../compat.h:25:52: fatal error: linux/version.h: No such file or directory #include <linux/version.h> /* LINUX_VERSION_CODE */ ^ compilation terminated. In file included from <command-line>:0:0: /usr/src//batman-adv/build/../compat.h:25:52: fatal error: linux/version.h: No such file or directory #include <linux/version.h> /* LINUX_VERSION_CODE */ ^ compilation terminated. /usr/src/linux-headers-4.14.0-0.bpo.3-common/scripts/gcc-version.sh: line 32: printf: #: invalid number /usr/src/linux-headers-4.14.0-0.bpo.3-common/scripts/gcc-version.sh: line 32: printf: #: invalid number /bin/sh: 1: [: 0001: unexpected operator This can be avoided by disabling the compat.h whenever the preprocessor define __KERNEL__ is not set. [1] https://patchwork.kernel.org/patch/5238591/ Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- compat.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/compat.h b/compat.h index c10ad589..759829f9 100644 --- a/compat.h +++ b/compat.h @@ -21,6 +21,8 @@ #ifndef _NET_BATMAN_ADV_COMPAT_H_ #define _NET_BATMAN_ADV_COMPAT_H_ +#ifdef __KERNEL__ + #include <linux/version.h> /* LINUX_VERSION_CODE */ #include <linux/kconfig.h> #include <generated/autoconf.h> @@ -159,4 +161,6 @@ static int __batadv_interface_kill_vid(struct net_device *dev, __be16 proto,\ #endif /* < KERNEL_VERSION(4, 15, 0) */ +#endif /* __KERNEL__ */ + #endif /* _NET_BATMAN_ADV_COMPAT_H_ */ -- 2.11.0

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[B.A.T.M.A.N.] [PATCH maint 1/2] batman-adv: Ignore invalid batadv_iv_gw during netlink send
by Sven Eckelmann 26 Feb '18

26 Feb '18

The function batadv_iv_gw_dump stops the processing loop when batadv_iv_gw_dump_entry returns a non-0 return code. This should only happen when the buffer is full. Otherwise, an empty message may be returned by batadv_gw_dump. This empty message will then stop the netlink dumping of gateway entries. At worst, not a single entry is returned to userspace even when plenty of possible gateways exist. Fixes: fa3228924152 ("batman-adv: add B.A.T.M.A.N. IV bat_gw_dump implementations") Signed-off-by: Sven Eckelmann <sven.eckelmann(a)openmesh.com> --- net/batman-adv/bat_iv_ogm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index bbe8414b..37064268 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -2719,7 +2719,7 @@ static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, struct batadv_neigh_ifinfo *router_ifinfo = NULL; struct batadv_neigh_node *router; struct batadv_gw_node *curr_gw; - int ret = -EINVAL; + int ret = 0; void *hdr; router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); -- 2.11.0

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[B.A.T.M.A.N.] [PATCH maint 1/2] batman-adv: Fix netlink dumping of BLA claims
by Sven Eckelmann 26 Feb '18

26 Feb '18

The function batadv_bla_claim_dump_bucket must be able to handle non-complete dumps of a single bucket. It tries to do that by saving the latest dumped index in *idx_skip to inform the caller about the current state. But the caller only assumes that buckets were not completely dumped when the return code is non-zero. This function must therefore also return a non-zero index when the dumping of an entry failed. Otherwise the caller will just skip all remaining buckets. And the function must also reset *idx_skip back to zero when it finished a bucket. Otherwise it will skip the same number of entries in the next bucket as the previous one had. Fixes: 3b7a63606020 ("batman-adv: add B.A.T.M.A.N. Dump BLA claims via netlink") Reported-by: Linus Lüssing <linus.luessing(a)c0d3.blue> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- net/batman-adv/bridge_loop_avoidance.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c index cdd8e8e4..60ce119e 100644 --- a/net/batman-adv/bridge_loop_avoidance.c +++ b/net/batman-adv/bridge_loop_avoidance.c @@ -2161,22 +2161,25 @@ batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, { struct batadv_bla_claim *claim; int idx = 0; + int ret = 0; rcu_read_lock(); hlist_for_each_entry_rcu(claim, head, hash_entry) { if (idx++ < *idx_skip) continue; - if (batadv_bla_claim_dump_entry(msg, portid, seq, - primary_if, claim)) { + + ret = batadv_bla_claim_dump_entry(msg, portid, seq, + primary_if, claim); + if (ret) { *idx_skip = idx - 1; goto unlock; } } - *idx_skip = idx; + *idx_skip = 0; unlock: rcu_read_unlock(); - return 0; + return ret; } /** -- 2.16.1

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[B.A.T.M.A.N.] [PATCH] batman-adv: Avoid relation operator comparison with bool
by Sven Eckelmann 20 Feb '18

20 Feb '18

commit 34b3c3850e7d ("batman-adv: Distributed ARP Table - create DHT helper functions") introduced a return check of batadv_compare_eth which uses a boolean return value since commit 16af73458aca ("batman-adv: main, batadv_compare_eth return bool"). A relational (<, >, <= or >=) operator is not the right one for such a check. Reported-by: David Binderman <dcb314(a)hotmail.com> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- Cc: David Binderman <dcb314(a)hotmail.com> Cc: Antonio Quartulli <a(a)unstable.cc> Cc: Markus Pargmann <mpa(a)pengutronix.de> --- net/batman-adv/distributed-arp-table.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c index 760c0de7..a39a07d6 100644 --- a/net/batman-adv/distributed-arp-table.c +++ b/net/batman-adv/distributed-arp-table.c @@ -493,7 +493,7 @@ static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res, * the one with the lowest address */ if (tmp_max == max && max_orig_node && - batadv_compare_eth(candidate->orig, max_orig_node->orig) > 0) + batadv_compare_eth(candidate->orig, max_orig_node->orig)) goto out; ret = true; -- 2.11.0

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[B.A.T.M.A.N.] Debian Testing kernel module, BATMAN_V not supported
by Fox, Fred 16 Feb '18

16 Feb '18

When I try to set the routing algorithm to use BATMAN_V it returns the error: [ 2327:090973] batman_adv: Routing algorithm 'BATMAN_V' not supported Running batctl -v shows: batctl Debian 2017.4-1 [batman_adv: 2017.3] The kernel version from uname -a is: Linux [host] 4.14.0-3-686 #1 SMP Debian 4.14.13-1 (2018-01-14) i686 GNU/Linux I am guessing that the option CONFIG_BATMAN_ADV_BATMAN_V=n was used when the kernel module was compiled. - Is disabling BATMAN_V the default for most distributions? - Is it because of stability issues with current wireless drivers (as reading the mailing list implies)? - Does anyone know what distributions enable BATMAN_V for their kernels? In testing BATMAN_IV with my hardware, I noticed that as long as Node A could see Node C, it would communicate directly with it, even if the links between nodes A-B and nodes B-C had much higher throughput (tested with batctl tp). Would like to see if BATMAN_V would select the higher throughput path. This electronic message contains information generated by the USDA solely for the intended recipients. Any unauthorized interception of this message or the use or disclosure of the information it contains may violate the law and subject the violator to civil or criminal penalties. If you believe you have received this message in error, please notify the sender and delete the email immediately.

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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 maint] batman-adv: fix packet checksum in receive path
by Matthias Schiffer 23 Jan '18

23 Jan '18

skb_postpull_rcsum() is necessary after eth_type_trans() to adjust the skb checksum, otherwise log spam of the form "bat0: hw csum failure" will result when packets with CHECKSUM_COMPLETE are received (at least in some setups, e.g. when stacking batman-adv on top of VXLAN). Signed-off-by: Matthias Schiffer <mschiffer(a)universe-factory.net> --- I don't know what the exact circumstances are that trigger the log spam, but it seems this was broken forever (I could also reproduce the issue with our compat-14 legacy branch)... so please ask David to queue this up for stable :) net/batman-adv/soft-interface.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index c95e2b26..edeffcb9 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -459,13 +459,7 @@ void batadv_interface_rx(struct net_device *soft_iface, /* skb->dev & skb->pkt_type are set here */ skb->protocol = eth_type_trans(skb, soft_iface); - - /* should not be necessary anymore as we use skb_pull_rcsum() - * TODO: please verify this and remove this TODO - * -- Dec 21st 2009, Simon Wunderlich - */ - - /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ + skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); batadv_inc_counter(bat_priv, BATADV_CNT_RX); batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, -- 2.16.0

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[B.A.T.M.A.N.] [PATCH maint v2 1/2] batman-adv: fix packet checksum in receive path
by Matthias Schiffer 23 Jan '18

23 Jan '18

eth_type_trans() internally calls skb_pull(), which does not adjust the skb checksum; skb_postpull_rcsum() is necessary to avoid log spam of the form "bat0: hw csum failure" when packets with CHECKSUM_COMPLETE are received. Note that in usual setups, packets don't reach batman-adv with CHECKSUM_COMPLETE (I assume NICs bail out of checksumming when they see batadv's ethtype?), which is why the log messages do nor occur on every system using batman-adv. I could reproduce this issue by stacking batman-adv on top of a VXLAN interface. Signed-off-by: Matthias Schiffer <mschiffer(a)universe-factory.net> --- net/batman-adv/soft-interface.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 9f673cdf..6f7ce7a6 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -451,13 +451,7 @@ void batadv_interface_rx(struct net_device *soft_iface, /* skb->dev & skb->pkt_type are set here */ skb->protocol = eth_type_trans(skb, soft_iface); - - /* should not be necessary anymore as we use skb_pull_rcsum() - * TODO: please verify this and remove this TODO - * -- Dec 21st 2009, Simon Wunderlich - */ - - /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ + skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); batadv_inc_counter(bat_priv, BATADV_CNT_RX); batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, -- 2.16.1

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