B.A.T.M.A.N April 2013

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

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76 discussions

[B.A.T.M.A.N.] [PATCH] batman-adv: avoid race conditions on TT global table by counting references
by Antonio Quartulli 15 Apr '13

15 Apr '13

To avoid race conditions on TT global table clean up keep track of the number of active contexts (each tt_global_entry is once context) iand destroy the table only when the counter reaches zero. In this way the TT global table internal hash cannot be deleted until all the entries have been destroyed. CC: Linus Lüssing <linus.luessing(a)web.de> CC: Simon Wunderlich <siwu(a)hrz.tu-chemnitz.de> CC: Marek Lindner <lindner_marek(a)yahoo.de> Signed-off-by: Antonio Quartulli <ordex(a)autistici.org> --- This patch makes ("batman-adv: Fix general protection fault in batadv_tt_global_del_orig()") obsolete. This is a redesign which is supposed to make the race condition impossible. However, I still think we should merge Linus's fix to maint so that we can send it to net and then proceed with this patch in master. Cheers, translation-table.c | 81 ++++++++++++++++++++++++++++++++++++++++------------- types.h | 4 +++ 2 files changed, 65 insertions(+), 20 deletions(-) diff --git a/translation-table.c b/translation-table.c index 96dfb38..739613e 100644 --- a/translation-table.c +++ b/translation-table.c @@ -117,6 +117,29 @@ batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry) kfree_rcu(tt_local_entry, common.rcu); } +static void +batadv_tt_global_table_free_rcu(struct rcu_head *rcu) +{ + struct batadv_priv_tt *tt_priv; + + tt_priv = container_of(rcu, struct batadv_priv_tt, global_rcu); + + kfree(tt_priv->global_hash); + tt_priv->global_hash = NULL; +} + +static void +batadv_tt_global_table_free_ref(struct batadv_priv *bat_priv) +{ + /* test if this was the last reference to the global table. If so, + * destroy the table as well + */ + if (!atomic_dec_and_test(&bat_priv->tt.global_refcount)) + return; + + call_rcu(&bat_priv->tt.global_rcu, batadv_tt_global_table_free_rcu); +} + static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) { struct batadv_tt_common_entry *tt_common_entry; @@ -130,13 +153,16 @@ static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) } static void -batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) +batadv_tt_global_entry_free_ref(struct batadv_priv *bat_priv, + struct batadv_tt_global_entry *tt_global_entry) { - if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { - batadv_tt_global_del_orig_list(tt_global_entry); - call_rcu(&tt_global_entry->common.rcu, - batadv_tt_global_entry_free_rcu); - } + if (!atomic_dec_and_test(&tt_global_entry->common.refcount)) + return; + + batadv_tt_global_del_orig_list(tt_global_entry); + call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu); + + batadv_tt_global_table_free_ref(bat_priv); } static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) @@ -251,7 +277,7 @@ static void batadv_tt_global_free(struct batadv_priv *bat_priv, batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, batadv_choose_orig, tt_global->common.addr); - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_free_ref(bat_priv, tt_global); } void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, @@ -364,7 +390,7 @@ out: if (tt_local) batadv_tt_local_entry_free_ref(tt_local); if (tt_global) - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_free_ref(bat_priv, tt_global); } static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, @@ -687,6 +713,12 @@ static int batadv_tt_global_init(struct batadv_priv *bat_priv) if (!bat_priv->tt.global_hash) return -ENOMEM; + /* initialise the refcount to 1 meaning that the global table is used by + * the TT component. This is balanced by tt_global_table_free_ref() in + * tt_global_table_free() + */ + atomic_set(&bat_priv->tt.global_refcount, 1); + batadv_hash_set_lock_class(bat_priv->tt.global_hash, &batadv_tt_global_hash_lock_class_key); @@ -844,7 +876,17 @@ int batadv_tt_global_add(struct batadv_priv *bat_priv, if (unlikely(hash_added != 0)) { /* remove the reference for the hash */ - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_free_ref(bat_priv, + tt_global_entry); + goto out_remove; + } + + /* increase the refcounter for this new "reference to the global + * table represented by the global entry. If the increment + * fails remove the entry from the hash + */ + if (!atomic_inc_not_zero(&bat_priv->tt.global_refcount)) { + hlist_del_rcu(&tt_global_entry->common.hash_entry); goto out_remove; } } else { @@ -918,7 +960,7 @@ out_remove: out: if (tt_global_entry) - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_free_ref(bat_priv, tt_global_entry); if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); return ret; @@ -1180,7 +1222,7 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv, out: if (tt_global_entry) - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_free_ref(bat_priv, tt_global_entry); if (local_entry) batadv_tt_local_entry_free_ref(local_entry); } @@ -1219,7 +1261,8 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, "Deleting global tt entry %pM: %s\n", tt_global->common.addr, message); hlist_del_rcu(&tt_common_entry->hash_entry); - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_free_ref(bat_priv, + tt_global); } } spin_unlock_bh(list_lock); @@ -1280,7 +1323,7 @@ static void batadv_tt_global_purge(struct batadv_priv *bat_priv) hlist_del_rcu(&tt_common->hash_entry); - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_free_ref(bat_priv, tt_global); } spin_unlock_bh(list_lock); } @@ -1312,14 +1355,12 @@ static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) tt_global = container_of(tt_common_entry, struct batadv_tt_global_entry, common); - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_free_ref(bat_priv, tt_global); } spin_unlock_bh(list_lock); } - batadv_hash_destroy(hash); - - bat_priv->tt.global_hash = NULL; + batadv_tt_global_table_free_ref(bat_priv); } static bool @@ -1373,7 +1414,7 @@ struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, out: if (tt_global_entry) - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_free_ref(bat_priv, tt_global_entry); if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); @@ -2433,7 +2474,7 @@ bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, out: if (tt_global_entry) - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_free_ref(bat_priv, tt_global_entry); if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); return ret; @@ -2521,7 +2562,7 @@ bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, goto out; ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_free_ref(bat_priv, tt_global_entry); out: return ret; } diff --git a/types.h b/types.h index 5f542bd..a293a9b 100644 --- a/types.h +++ b/types.h @@ -337,6 +337,8 @@ enum batadv_counters { * @changes_list: tracks tt local changes within an originator interval * @local_hash: local translation table hash table * @global_hash: global translation table hash table + * @global_refcount: number of context where the global_hash table is used + * @global_rcu: object used to free the global table * @req_list: list of pending & unanswered tt_requests * @roam_list: list of the last roaming events of each client limiting the * number of roaming events to avoid route flapping @@ -357,6 +359,8 @@ struct batadv_priv_tt { struct list_head changes_list; struct batadv_hashtable *local_hash; struct batadv_hashtable *global_hash; + atomic_t global_refcount; + struct rcu_head global_rcu; struct list_head req_list; struct list_head roam_list; spinlock_t changes_list_lock; /* protects changes */ -- 1.8.1.5

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[B.A.T.M.A.N.] [PATCH] batman-adv: don't initialise batman_iv private members in hard-interface.c
by Antonio Quartulli 15 Apr '13

15 Apr '13

From: Antonio Quartulli <antonio(a)open-mesh.com> hard-interface.c has to do not contain any routing algorithm specific code. Allocate the hard-interface with kzalloc() and remove any useless and algorithm specific member initialisation Signed-off-by: Antonio Quartulli <antonio(a)open-mesh.com> --- hard-interface.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/hard-interface.c b/hard-interface.c index 18f4523..dc4ac29 100644 --- a/hard-interface.c +++ b/hard-interface.c @@ -577,7 +577,7 @@ batadv_hardif_add_interface(struct net_device *net_dev) dev_hold(net_dev); - hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC); + hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); if (!hard_iface) goto release_dev; @@ -603,12 +603,6 @@ batadv_hardif_add_interface(struct net_device *net_dev) batadv_check_known_mac_addr(hard_iface->net_dev); list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); - /* This can't be called via a bat_priv callback because - * we have no bat_priv yet. - */ - atomic_set(&hard_iface->bat_iv.ogm_seqno, 1); - hard_iface->bat_iv.ogm_buff = NULL; - return hard_iface; free_if: -- 1.8.1.5

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[B.A.T.M.A.N.] DAT - possible bug at incoming ARP request
by Mihail Costea 09 Apr '13

09 Apr '13

Hi, In the file distributed-arp-table.c, function batadv_dat_snoop_incoming_arp_request, after creation of ARP reply (skb_new = arp_create(...)) and testing if the creation was successful, shouldn't exist a call to skb_reset_mac_header(skb_new), just like in batadv_dat_snoop_outgoing_arp_request? I've done something similar for NDP and I think that this is the line that might generate a kernel panic (not sure yet, I might have to do more testing). As I said, I'm not sure yet, and maybe my code might generate it. But my question is why isn't here a skb_reset_mac_header as it is in the first function. Thanks, Mihail

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[B.A.T.M.A.N.] horst and batman-adv
by cmsv 09 Apr '13

09 Apr '13

I found about Horst a few years ago when i got to know olsr and it's usefulness for olsr mesh networks and recently decided to check it out again. Although i do see an option for batman i am not sure if it refers to batmand or batman-adv and as i wait for an answer from it's developer. My question is if there are any plans for a similar tool from open-mesh side. I am also curious to know if someone is using it with batman-adv or anything equivalent/similar or close ? What are our options. http://br1.einfach.org/tech/horst/ -- Site: http://wirelesspt.net Mesh: http://tinyurl.com/wirelesspt Admin: http://wirelesspt.net/wiki/Cmsv Suporte técnico via sms: 91 19 11 798 Chave publica PGP/SSH: http://wirelesspt.net/arquivos/pk Email assinado digitalmente pelo emissor assegurando autenticidade

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[B.A.T.M.A.N.] [PATCH] batman-adv: move ring_buffer helper functions in bat_iv_ogm
by Antonio Quartulli 08 Apr '13

08 Apr '13

the two lonely ring_buffer helper functions are used by the bat_iv_ogm module only and therefore they can be moved inside it. Reported-by: Marek Lindner <lindner_marek(a)yahoo.de> Signed-off-by: Antonio Quartulli <ordex(a)autistici.org> --- Makefile.kbuild | 1 - bat_iv_ogm.c | 30 +++++++++++++++++++++++++++++- ring_buffer.c | 51 --------------------------------------------------- ring_buffer.h | 27 --------------------------- 4 files changed, 29 insertions(+), 80 deletions(-) delete mode 100644 ring_buffer.c delete mode 100644 ring_buffer.h diff --git a/Makefile.kbuild b/Makefile.kbuild index acbac2a..489bb36 100644 --- a/Makefile.kbuild +++ b/Makefile.kbuild @@ -32,7 +32,6 @@ batman-adv-y += icmp_socket.o batman-adv-y += main.o batman-adv-$(CONFIG_BATMAN_ADV_NC) += network-coding.o batman-adv-y += originator.o -batman-adv-y += ring_buffer.o batman-adv-y += routing.o batman-adv-y += send.o batman-adv-y += soft-interface.o diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 3c6670f..66d2c3b 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -19,7 +19,6 @@ #include "main.h" #include "translation-table.h" -#include "ring_buffer.h" #include "originator.h" #include "routing.h" #include "gateway_common.h" @@ -29,6 +28,35 @@ #include "bat_algo.h" #include "network-coding.h" +static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, + uint8_t value) +{ + lq_recv[*lq_index] = value; + *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; +} + +static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) +{ + const uint8_t *ptr; + uint16_t count = 0, i = 0, sum = 0; + + ptr = lq_recv; + + while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { + if (*ptr != 0) { + count++; + sum += *ptr; + } + + i++; + ptr++; + } + + if (count == 0) + return 0; + + return (uint8_t)(sum / count); +} static struct batadv_neigh_node * batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, const uint8_t *neigh_addr, diff --git a/ring_buffer.c b/ring_buffer.c deleted file mode 100644 index ccab0bb..0000000 --- a/ring_buffer.c +++ /dev/null @@ -1,51 +0,0 @@ -/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: - * - * Marek Lindner - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA - */ - -#include "main.h" -#include "ring_buffer.h" - -void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, - uint8_t value) -{ - lq_recv[*lq_index] = value; - *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; -} - -uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) -{ - const uint8_t *ptr; - uint16_t count = 0, i = 0, sum = 0; - - ptr = lq_recv; - - while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { - if (*ptr != 0) { - count++; - sum += *ptr; - } - - i++; - ptr++; - } - - if (count == 0) - return 0; - - return (uint8_t)(sum / count); -} diff --git a/ring_buffer.h b/ring_buffer.h deleted file mode 100644 index 3f92ae2..0000000 --- a/ring_buffer.h +++ /dev/null @@ -1,27 +0,0 @@ -/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: - * - * Marek Lindner - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA - */ - -#ifndef _NET_BATMAN_ADV_RING_BUFFER_H_ -#define _NET_BATMAN_ADV_RING_BUFFER_H_ - -void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, - uint8_t value); -uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]); - -#endif /* _NET_BATMAN_ADV_RING_BUFFER_H_ */ -- 1.8.1.5

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[B.A.T.M.A.N.] [PATCH] batman-adv: change VID semantic in the BLA code
by Antonio Quartulli 07 Apr '13

07 Apr '13

From: Antonio Quartulli <antonio(a)open-mesh.com> In order to make batman-adv fully vlan aware later, the semantic used for variables storing the VLAN ID values has to be changed in order to be adapted to the new one which will be used batman-adv wide. In particular, the VID has to be an "_unsigned_ short int" and its 4 MSB will be used as a flag bitfield, while the remaining 12 bits are used to store the real VID value Cc: Simon Wunderlich <siwu(a)hrz.tu-chemnitz.de> Signed-off-by: Antonio Quartulli <antonio(a)open-mesh.com> --- bridge_loop_avoidance.c | 87 +++++++++++++++++++++++++++---------------------- bridge_loop_avoidance.h | 12 ++++--- main.h | 3 ++ packet.h | 8 +++++ soft-interface.c | 4 +-- types.h | 4 +-- 6 files changed, 70 insertions(+), 48 deletions(-) diff --git a/bridge_loop_avoidance.c b/bridge_loop_avoidance.c index 6a4f728..e0d716c 100644 --- a/bridge_loop_avoidance.c +++ b/bridge_loop_avoidance.c @@ -180,7 +180,7 @@ static struct batadv_bla_claim */ static struct batadv_bla_backbone_gw * batadv_backbone_hash_find(struct batadv_priv *bat_priv, - uint8_t *addr, short vid) + uint8_t *addr, unsigned short vid) { struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; struct hlist_head *head; @@ -257,7 +257,7 @@ batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) */ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, - short vid, int claimtype) + unsigned short vid, int claimtype) { struct sk_buff *skb; struct ethhdr *ethhdr; @@ -307,7 +307,7 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, */ memcpy(ethhdr->h_source, mac, ETH_ALEN); batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid); + "bla_send_claim(): CLAIM %pM on vid %u\n", mac, vid); break; case BATADV_CLAIM_TYPE_UNCLAIM: /* unclaim frame @@ -315,7 +315,7 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, */ memcpy(hw_src, mac, ETH_ALEN); batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, + "bla_send_claim(): UNCLAIM %pM on vid %u\n", mac, vid); break; case BATADV_CLAIM_TYPE_ANNOUNCE: @@ -324,7 +324,7 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, */ memcpy(hw_src, mac, ETH_ALEN); batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", + "bla_send_claim(): ANNOUNCE of %pM on vid %u\n", ethhdr->h_source, vid); break; case BATADV_CLAIM_TYPE_REQUEST: @@ -335,13 +335,13 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, memcpy(hw_src, mac, ETH_ALEN); memcpy(ethhdr->h_dest, mac, ETH_ALEN); batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n", + "bla_send_claim(): REQUEST of %pM to %pM on vid %u\n", ethhdr->h_source, ethhdr->h_dest, vid); break; } - if (vid != -1) - skb = vlan_insert_tag(skb, vid); + if (vid & BATADV_VLAN_HAS_TAG) + skb = vlan_insert_tag(skb, vid & BATADV_VID_MASK); skb_reset_mac_header(skb); skb->protocol = eth_type_trans(skb, soft_iface); @@ -367,7 +367,7 @@ out: */ static struct batadv_bla_backbone_gw * batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, - short vid, bool own_backbone) + unsigned short vid, bool own_backbone) { struct batadv_bla_backbone_gw *entry; struct batadv_orig_node *orig_node; @@ -379,7 +379,7 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, return entry; batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", + "bla_get_backbone_gw(): not found (%pM, %u), creating new entry\n", orig, vid); entry = kzalloc(sizeof(*entry), GFP_ATOMIC); @@ -434,7 +434,7 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, static void batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, - short vid) + unsigned short vid) { struct batadv_bla_backbone_gw *backbone_gw; @@ -456,7 +456,7 @@ batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, */ static void batadv_bla_answer_request(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, - short vid) + unsigned short vid) { struct hlist_head *head; struct batadv_hashtable *hash; @@ -547,7 +547,7 @@ static void batadv_bla_send_announce(struct batadv_priv *bat_priv, * @backbone_gw: the backbone gateway which claims it */ static void batadv_bla_add_claim(struct batadv_priv *bat_priv, - const uint8_t *mac, const short vid, + const uint8_t *mac, const unsigned short vid, struct batadv_bla_backbone_gw *backbone_gw) { struct batadv_bla_claim *claim; @@ -571,7 +571,7 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv, atomic_set(&claim->refcount, 2); batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", + "bla_add_claim(): adding new entry %pM, vid %u to hash ...\n", mac, vid); hash_added = batadv_hash_add(bat_priv->bla.claim_hash, batadv_compare_claim, @@ -590,7 +590,7 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv, goto claim_free_ref; batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_add_claim(): changing ownership for %pM, vid %d\n", + "bla_add_claim(): changing ownership for %pM, vid %u\n", mac, vid); claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); @@ -611,7 +611,7 @@ claim_free_ref: * given mac address and vid. */ static void batadv_bla_del_claim(struct batadv_priv *bat_priv, - const uint8_t *mac, const short vid) + const uint8_t *mac, const unsigned short vid) { struct batadv_bla_claim search_claim, *claim; @@ -621,7 +621,7 @@ static void batadv_bla_del_claim(struct batadv_priv *bat_priv, if (!claim) return; - batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", + batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %u\n", mac, vid); batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, @@ -637,7 +637,7 @@ static void batadv_bla_del_claim(struct batadv_priv *bat_priv, /* check for ANNOUNCE frame, return 1 if handled */ static int batadv_handle_announce(struct batadv_priv *bat_priv, uint8_t *an_addr, uint8_t *backbone_addr, - short vid) + unsigned short vid) { struct batadv_bla_backbone_gw *backbone_gw; uint16_t crc; @@ -657,7 +657,7 @@ static int batadv_handle_announce(struct batadv_priv *bat_priv, crc = ntohs(*((__be16 *)(&an_addr[4]))); batadv_dbg(BATADV_DBG_BLA, bat_priv, - "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", + "handle_announce(): ANNOUNCE vid %u (sent by %pM)... CRC = %#.4x\n", vid, backbone_gw->orig, crc); if (backbone_gw->crc != crc) { @@ -685,7 +685,7 @@ static int batadv_handle_announce(struct batadv_priv *bat_priv, static int batadv_handle_request(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, uint8_t *backbone_addr, - struct ethhdr *ethhdr, short vid) + struct ethhdr *ethhdr, unsigned short vid) { /* check for REQUEST frame */ if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) @@ -698,7 +698,7 @@ static int batadv_handle_request(struct batadv_priv *bat_priv, return 1; batadv_dbg(BATADV_DBG_BLA, bat_priv, - "handle_request(): REQUEST vid %d (sent by %pM)...\n", + "handle_request(): REQUEST vid %u (sent by %pM)...\n", vid, ethhdr->h_source); batadv_bla_answer_request(bat_priv, primary_if, vid); @@ -709,7 +709,7 @@ static int batadv_handle_request(struct batadv_priv *bat_priv, static int batadv_handle_unclaim(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, uint8_t *backbone_addr, - uint8_t *claim_addr, short vid) + uint8_t *claim_addr, unsigned short vid) { struct batadv_bla_backbone_gw *backbone_gw; @@ -726,7 +726,7 @@ static int batadv_handle_unclaim(struct batadv_priv *bat_priv, /* this must be an UNCLAIM frame */ batadv_dbg(BATADV_DBG_BLA, bat_priv, - "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", + "handle_unclaim(): UNCLAIM %pM on vid %u (sent by %pM)...\n", claim_addr, vid, backbone_gw->orig); batadv_bla_del_claim(bat_priv, claim_addr, vid); @@ -738,7 +738,7 @@ static int batadv_handle_unclaim(struct batadv_priv *bat_priv, static int batadv_handle_claim(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, uint8_t *backbone_addr, uint8_t *claim_addr, - short vid) + unsigned short vid) { struct batadv_bla_backbone_gw *backbone_gw; @@ -861,7 +861,7 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv, struct batadv_bla_claim_dst *bla_dst; uint16_t proto; int headlen; - short vid = -1; + unsigned short vid = BATADV_NO_FLAGS; int ret; ethhdr = (struct ethhdr *)skb_mac_header(skb); @@ -869,6 +869,7 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv, if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { vhdr = (struct vlan_ethhdr *)ethhdr; vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; + vid |= BATADV_VLAN_HAS_TAG; proto = ntohs(vhdr->h_vlan_encapsulated_proto); headlen = sizeof(*vhdr); } else { @@ -909,8 +910,9 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv, ethhdr); if (ret == 1) batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", - ethhdr->h_source, vid, hw_src, hw_dst); + "bla_process_claim(): received a claim frame from another group. From: %pM on vid %u ...(hw_src %pM, hw_dst %pM)\n", + ethhdr->h_source, vid, hw_src, + hw_dst); if (ret < 2) return ret; @@ -944,7 +946,7 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv, } batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_process_claim(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", + "bla_process_claim(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %u ...(hw_src %pM, hw_dst %pM)\n", ethhdr->h_source, vid, hw_src, hw_dst); return 1; } @@ -1033,7 +1035,7 @@ static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, continue; batadv_dbg(BATADV_DBG_BLA, bat_priv, - "bla_purge_claims(): %pM, vid %d, time out\n", + "bla_purge_claims(): %pM, vid %u, time out\n", claim->addr, claim->vid); purge_now: @@ -1358,7 +1360,7 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb, struct ethhdr *ethhdr; struct vlan_ethhdr *vhdr; struct batadv_bla_backbone_gw *backbone_gw; - short vid = -1; + unsigned short vid = BATADV_NO_FLAGS; if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) return 0; @@ -1375,6 +1377,7 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb, vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size); vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; + vid |= BATADV_VLAN_HAS_TAG; } /* see if this originator is a backbone gw for this VLAN */ @@ -1424,8 +1427,8 @@ void batadv_bla_free(struct batadv_priv *bat_priv) * returns 1, otherwise it returns 0 and the caller shall further * process the skb. */ -int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid, - bool is_bcast) +int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid, bool is_bcast) { struct ethhdr *ethhdr; struct batadv_bla_claim search_claim, *claim = NULL; @@ -1519,7 +1522,8 @@ out: * returns 1, otherwise it returns 0 and the caller shall further * process the skb. */ -int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid) +int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid) { struct ethhdr *ethhdr; struct batadv_bla_claim search_claim, *claim = NULL; @@ -1623,9 +1627,11 @@ int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) hlist_for_each_entry_rcu(claim, head, hash_entry) { is_own = batadv_compare_eth(claim->backbone_gw->orig, primary_addr); - seq_printf(seq, " * %pM on % 5d by %pM [%c] (%#.4x)\n", - claim->addr, claim->vid, - claim->backbone_gw->orig, + seq_printf(seq, + " * %pM on %5u (tag: %3s) by %pM [%c] (%#.4x)\n", + claim->addr, claim->vid & BATADV_VID_MASK, + (claim->vid & BATADV_VLAN_HAS_TAG ? + "yes" : "no"), claim->backbone_gw->orig, (is_own ? 'x' : ' '), claim->backbone_gw->crc); } @@ -1677,9 +1683,12 @@ int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) continue; seq_printf(seq, - " * %pM on % 5d % 4i.%03is (%#.4x)\n", - backbone_gw->orig, backbone_gw->vid, - secs, msecs, backbone_gw->crc); + " * %pM on %5u (tag: %3s) % 4i.%03is (%#.4x)\n", + backbone_gw->orig, + backbone_gw->vid & BATADV_VID_MASK, + (backbone_gw->vid & BATADV_VLAN_HAS_TAG ? + "yes" : "no"), secs, msecs, + backbone_gw->crc); } rcu_read_unlock(); } diff --git a/bridge_loop_avoidance.h b/bridge_loop_avoidance.h index dea2fbc..4b102e7 100644 --- a/bridge_loop_avoidance.h +++ b/bridge_loop_avoidance.h @@ -21,9 +21,10 @@ #define _NET_BATMAN_ADV_BLA_H_ #ifdef CONFIG_BATMAN_ADV_BLA -int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid, - bool is_bcast); -int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid); +int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid, bool is_bcast); +int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid); int batadv_bla_is_backbone_gw(struct sk_buff *skb, struct batadv_orig_node *orig_node, int hdr_size); int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset); @@ -42,13 +43,14 @@ void batadv_bla_free(struct batadv_priv *bat_priv); #else /* ifdef CONFIG_BATMAN_ADV_BLA */ static inline int batadv_bla_rx(struct batadv_priv *bat_priv, - struct sk_buff *skb, short vid, bool is_bcast) + struct sk_buff *skb, unsigned short vid, + bool is_bcast) { return 0; } static inline int batadv_bla_tx(struct batadv_priv *bat_priv, - struct sk_buff *skb, short vid) + struct sk_buff *skb, unsigned short vid) { return 0; } diff --git a/main.h b/main.h index 2c751c6..17821e1 100644 --- a/main.h +++ b/main.h @@ -136,6 +136,9 @@ enum batadv_uev_type { #define BATADV_DAT_CANDIDATE_NOT_FOUND 0 #define BATADV_DAT_CANDIDATE_ORIG 1 +/* mask needed to extract the vlan ID (12bits) from a 16bits variable */ +#define BATADV_VID_MASK 0x0FFF + /* Debug Messages */ #ifdef pr_fmt #undef pr_fmt diff --git a/packet.h b/packet.h index a51ccfc..d5464f6 100644 --- a/packet.h +++ b/packet.h @@ -105,6 +105,14 @@ enum batadv_tt_client_flags { BATADV_TT_CLIENT_PENDING = BIT(10), }; +/** + * batadv_vlan_flags - flags for the four MSB of any vlan ID field + * @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not + */ +enum batadv_vlan_flags { + BATADV_VLAN_HAS_TAG = BIT(15), +}; + /* claim frame types for the bridge loop avoidance */ enum batadv_bla_claimframe { BATADV_CLAIM_TYPE_CLAIM = 0x00, diff --git a/soft-interface.c b/soft-interface.c index 403b8c4..34597a2 100644 --- a/soft-interface.c +++ b/soft-interface.c @@ -154,7 +154,7 @@ static int batadv_interface_tx(struct sk_buff *skb, 0x00, 0x00}; unsigned int header_len = 0; int data_len = skb->len, ret; - short vid __maybe_unused = -1; + unsigned short vid __maybe_unused = BATADV_NO_FLAGS; bool do_bcast = false; uint32_t seqno; unsigned long brd_delay = 1; @@ -303,7 +303,7 @@ void batadv_interface_rx(struct net_device *soft_iface, struct ethhdr *ethhdr; struct vlan_ethhdr *vhdr; struct batadv_header *batadv_header = (struct batadv_header *)skb->data; - short vid __maybe_unused = -1; + unsigned short vid __maybe_unused = BATADV_NO_FLAGS; __be16 ethertype = __constant_htons(ETH_P_BATMAN); bool is_bcast; diff --git a/types.h b/types.h index 5f542bd..b2c94e1 100644 --- a/types.h +++ b/types.h @@ -642,7 +642,7 @@ struct batadv_socket_packet { #ifdef CONFIG_BATMAN_ADV_BLA struct batadv_bla_backbone_gw { uint8_t orig[ETH_ALEN]; - short vid; + unsigned short vid; struct hlist_node hash_entry; struct batadv_priv *bat_priv; unsigned long lasttime; @@ -665,7 +665,7 @@ struct batadv_bla_backbone_gw { */ struct batadv_bla_claim { uint8_t addr[ETH_ALEN]; - short vid; + unsigned short vid; struct batadv_bla_backbone_gw *backbone_gw; unsigned long lasttime; struct hlist_node hash_entry; -- 1.8.1.5

2 3

[B.A.T.M.A.N.] [PATCHv2 1/2] batctl: fix 4addr parsing in tcpdump
by Antonio Quartulli 03 Apr '13

03 Apr '13

In the UNICAST4ADDR parsing routing a wrong type is used to parse the batman header, resulting in a wrong data visualization. Fix this by using the correct data type. Introduced by 70aefcf8abefd509e5721c6ae228d3854d5e8b16 ("batctl: Add minimal unicast 4addr dissector support") Signed-off-by: Antonio Quartulli <ordex(a)autistici.org> --- v2: - removed subtype print format tcpdump.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/tcpdump.c b/tcpdump.c index f357c6d..f69ac6f 100644 --- a/tcpdump.c +++ b/tcpdump.c @@ -545,14 +545,14 @@ static void dump_batman_frag(unsigned char *packet_buff, ssize_t buff_len, int r static void dump_batman_4addr(unsigned char *packet_buff, ssize_t buff_len, int read_opt, int time_printed) { struct ether_header *ether_header; - struct batadv_unicast_packet *unicast_4addr_packet; + struct batadv_unicast_4addr_packet *unicast_4addr_packet; - LEN_CHECK((size_t)buff_len - sizeof(struct ether_header), sizeof(struct batadv_unicast_packet), "BAT 4ADDR"); - LEN_CHECK((size_t)buff_len - sizeof(struct ether_header) - sizeof(struct batadv_unicast_packet), + LEN_CHECK((size_t)buff_len - sizeof(struct ether_header), sizeof(struct batadv_unicast_4addr_packet), "BAT 4ADDR"); + LEN_CHECK((size_t)buff_len - sizeof(struct ether_header) - sizeof(struct batadv_unicast_4addr_packet), sizeof(struct ether_header), "BAT 4ADDR (unpacked)"); ether_header = (struct ether_header *)packet_buff; - unicast_4addr_packet = (struct batadv_unicast_packet *)(packet_buff + sizeof(struct ether_header)); + unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)(packet_buff + sizeof(struct ether_header)); if (!time_printed) time_printed = print_time(); @@ -561,11 +561,11 @@ static void dump_batman_4addr(unsigned char *packet_buff, ssize_t buff_len, int get_name_by_macaddr((struct ether_addr *)ether_header->ether_shost, read_opt)); printf("%s: 4ADDR, ttvn %d, ttl %hhu, ", - get_name_by_macaddr((struct ether_addr *)unicast_4addr_packet->dest, read_opt), - unicast_4addr_packet->ttvn, unicast_4addr_packet->header.ttl); + get_name_by_macaddr((struct ether_addr *)unicast_4addr_packet->u.dest, read_opt), + unicast_4addr_packet->u.ttvn, unicast_4addr_packet->u.header.ttl); - parse_eth_hdr(packet_buff + ETH_HLEN + sizeof(struct batadv_unicast_packet), - buff_len - ETH_HLEN - sizeof(struct batadv_unicast_packet), + parse_eth_hdr(packet_buff + ETH_HLEN + sizeof(struct batadv_unicast_4addr_packet), + buff_len - ETH_HLEN - sizeof(struct batadv_unicast_4addr_packet), read_opt, time_printed); } -- 1.8.1.5

2 3

[B.A.T.M.A.N.] [PATCH] batman-adv: do not silently ignore wrong condition
by Antonio Quartulli 03 Apr '13

03 Apr '13

Only one neigh_node per orig_node should match a given neighbor address, therefore, if more than one matching neigh_node is found, a WARNING has to be triggered to let the user know that something is wrong in the originator state instead of silently skipping the error. Signed-off-by: Antonio Quartulli <ordex(a)autistici.org> --- bat_iv_ogm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 38183dc..9fbf588 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -669,7 +669,7 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && tmp_neigh_node->if_incoming == if_incoming && atomic_inc_not_zero(&tmp_neigh_node->refcount)) { - if (neigh_node) + if (WARN(neigh_node, "too many matching neigh_nodes") batadv_neigh_node_free_ref(neigh_node); neigh_node = tmp_neigh_node; continue; -- 1.8.1.5

2 4

[B.A.T.M.A.N.] [PATCH] batman-adv: don't check compat version twice
by Antonio Quartulli 03 Apr '13

03 Apr '13

From: Antonio Quartulli <antonio(a)open-mesh.com> Compatibility version is checked upon packet reception before calling any handler. For this reason it does need to be checked once more in the handler itself. Signed-off-by: Antonio Quartulli <antonio(a)open-mesh.com> --- bat_iv_ogm.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 6d62e29..38183dc 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -1054,13 +1054,6 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, } rcu_read_unlock(); - if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { - batadv_dbg(BATADV_DBG_BATMAN, bat_priv, - "Drop packet: incompatible batman version (%i)\n", - batadv_ogm_packet->header.version); - return; - } - if (is_my_addr) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Drop packet: received my own broadcast (sender: %pM)\n", -- 1.8.1.5

2 1

[B.A.T.M.A.N.] [PATCHv2] batman-adv: don't check the source address twice
by Antonio Quartulli 03 Apr '13

03 Apr '13

From: Antonio Quartulli <antonio(a)open-mesh.com> The source address has already been checked in batadv_check_management_packet() upon packet reception and therefore it does not need to be checked again in ogm_process() Signed-off-by: Antonio Quartulli <antonio(a)open-mesh.com> --- v2: - removed variable declaration bat_iv_ogm.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index da239c5..6d62e29 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -988,7 +988,7 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, struct batadv_neigh_node *orig_neigh_router = NULL; int has_directlink_flag; int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; - int is_broadcast = 0, is_bidirect; + int is_bidirect; bool is_single_hop_neigh = false; bool is_from_best_next_hop = false; int is_duplicate, sameseq, simlar_ttl; @@ -1051,9 +1051,6 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, if (batadv_compare_eth(batadv_ogm_packet->prev_sender, hard_iface->net_dev->dev_addr)) is_my_oldorig = 1; - - if (is_broadcast_ether_addr(ethhdr->h_source)) - is_broadcast = 1; } rcu_read_unlock(); @@ -1071,13 +1068,6 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, return; } - if (is_broadcast) { - batadv_dbg(BATADV_DBG_BATMAN, bat_priv, - "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", - ethhdr->h_source); - return; - } - if (is_my_orig) { unsigned long *word; int offset; -- 1.8.1.5

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