commits July 2015

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[batman-adv] master: batman-adv: Add lockdep_asserts for documented external locks (2a449bc)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv On branch : master >--------------------------------------------------------------- commit 2a449bcf3088f05ea1656a9da5d7ed2dbb5b6f8f Author: Sven Eckelmann <sven(a)narfation.org> Date: Sun Jun 21 14:45:15 2015 +0200 batman-adv: Add lockdep_asserts for documented external locks Some functions already have documentation about locks they require inside their kerneldoc header. These can be directly tested during runtime using the lockdep asserts. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Signed-off-by: Marek Lindner <mareklindner(a)neomailbox.ch> >--------------------------------------------------------------- 2a449bcf3088f05ea1656a9da5d7ed2dbb5b6f8f net/batman-adv/fragmentation.c | 3 +++ net/batman-adv/multicast.c | 6 ++++++ net/batman-adv/translation-table.c | 2 ++ 3 files changed, 11 insertions(+) diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c index ec5f7bc..700c96c 100644 --- a/net/batman-adv/fragmentation.c +++ b/net/batman-adv/fragmentation.c @@ -25,6 +25,7 @@ #include <linux/if_ether.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/lockdep.h> #include <linux/netdevice.h> #include <linux/pkt_sched.h> #include <linux/skbuff.h> @@ -112,6 +113,8 @@ static int batadv_frag_size_limit(void) static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain, u16 seqno) { + lockdep_assert_held(&chain->lock); + if (chain->seqno == seqno) return false; diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 63bf8e9..25ed931 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -609,6 +609,8 @@ static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; + lockdep_assert_held(&orig->mcast_handler_lock); + /* switched from flag unset to set */ if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { @@ -652,6 +654,8 @@ static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, struct hlist_node *node = &orig->mcast_want_all_ipv4_node; struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; + lockdep_assert_held(&orig->mcast_handler_lock); + /* switched from flag unset to set */ if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { @@ -695,6 +699,8 @@ static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, struct hlist_node *node = &orig->mcast_want_all_ipv6_node; struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; + lockdep_assert_held(&orig->mcast_handler_lock); + /* switched from flag unset to set */ if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 66a9bf2..75bc678 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -3268,6 +3268,8 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) */ static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv) { + lockdep_assert_held(&bat_priv->tt.commit_lock); + /* Update multicast addresses in local translation table */ batadv_mcast_mla_update(bat_priv);

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[batman-adv] master: batman-adv: Annotate deleting functions with external lock via lockdep (5b95c42)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv On branch : master >--------------------------------------------------------------- commit 5b95c427d18799a5cd069dcdce5fecda44e19614 Author: Sven Eckelmann <sven(a)narfation.org> Date: Sun Jun 21 14:45:14 2015 +0200 batman-adv: Annotate deleting functions with external lock via lockdep Functions which use (h)list_del* are requiring correct locking when they operate on global lists. Most of the time the search in the list and the delete are done in the same function. All other cases should have it visible that they require a special lock to avoid race conditions. Lockdep asserts can be used to check these problem during runtime when the lockdep functionality is enabled. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Signed-off-by: Marek Lindner <mareklindner(a)neomailbox.ch> >--------------------------------------------------------------- 5b95c427d18799a5cd069dcdce5fecda44e19614 net/batman-adv/main.c | 11 ++++++++--- net/batman-adv/multicast.c | 13 +++++++++++-- net/batman-adv/network-coding.c | 4 ++++ net/batman-adv/translation-table.c | 2 ++ 4 files changed, 25 insertions(+), 5 deletions(-) diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index d277ba7..50fc07b 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -30,6 +30,7 @@ #include <linux/ipv6.h> #include <linux/kernel.h> #include <linux/list.h> +#include <linux/lockdep.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/netdevice.h> @@ -737,13 +738,17 @@ static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) /** * batadv_tvlv_container_remove - remove tvlv container from the tvlv container * list + * @bat_priv: the bat priv with all the soft interface information * @tvlv: the to be removed tvlv container * * Has to be called with the appropriate locks being acquired * (tvlv.container_list_lock). */ -static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv) +static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv, + struct batadv_tvlv_container *tvlv) { + lockdep_assert_held(&bat_priv->tvlv.handler_list_lock); + if (!tvlv) return; @@ -768,7 +773,7 @@ void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, spin_lock_bh(&bat_priv->tvlv.container_list_lock); tvlv = batadv_tvlv_container_get(bat_priv, type, version); - batadv_tvlv_container_remove(tvlv); + batadv_tvlv_container_remove(bat_priv, tvlv); spin_unlock_bh(&bat_priv->tvlv.container_list_lock); } @@ -807,7 +812,7 @@ void batadv_tvlv_container_register(struct batadv_priv *bat_priv, spin_lock_bh(&bat_priv->tvlv.container_list_lock); tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); - batadv_tvlv_container_remove(tvlv_old); + batadv_tvlv_container_remove(bat_priv, tvlv_old); hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); spin_unlock_bh(&bat_priv->tvlv.container_list_lock); } diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 8fa9af2..63bf8e9 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -31,6 +31,7 @@ #include <linux/ip.h> #include <linux/ipv6.h> #include <linux/list.h> +#include <linux/lockdep.h> #include <linux/netdevice.h> #include <linux/rculist.h> #include <linux/rcupdate.h> @@ -103,15 +104,19 @@ static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, /** * batadv_mcast_mla_list_free - free a list of multicast addresses + * @bat_priv: the bat priv with all the soft interface information * @mcast_list: the list to free * * Removes and frees all items in the given mcast_list. */ -static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) +static void batadv_mcast_mla_list_free(struct batadv_priv *bat_priv, + struct hlist_head *mcast_list) { struct batadv_hw_addr *mcast_entry; struct hlist_node *tmp; + lockdep_assert_held(&bat_priv->tt.commit_lock); + hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { hlist_del(&mcast_entry->list); kfree(mcast_entry); @@ -134,6 +139,8 @@ static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, struct batadv_hw_addr *mcast_entry; struct hlist_node *tmp; + lockdep_assert_held(&bat_priv->tt.commit_lock); + hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, list) { if (mcast_list && @@ -164,6 +171,8 @@ static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, struct batadv_hw_addr *mcast_entry; struct hlist_node *tmp; + lockdep_assert_held(&bat_priv->tt.commit_lock); + if (!mcast_list) return; @@ -268,7 +277,7 @@ update: batadv_mcast_mla_tt_add(bat_priv, &mcast_list); out: - batadv_mcast_mla_list_free(&mcast_list); + batadv_mcast_mla_list_free(bat_priv, &mcast_list); } /** diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c index bfd5fe9..b07c57b 100644 --- a/net/batman-adv/network-coding.c +++ b/net/batman-adv/network-coding.c @@ -586,6 +586,8 @@ static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, unsigned long timeout = bat_priv->nc.max_buffer_time; bool res = false; + lockdep_assert_held(&nc_path->packet_list_lock); + /* Packets are added to tail, so the remaining packets did not time * out and we can stop processing the current queue */ @@ -622,6 +624,8 @@ static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, { unsigned long timeout = bat_priv->nc.max_fwd_delay; + lockdep_assert_held(&nc_path->packet_list_lock); + /* Packets are added to tail, so the remaining packets did not time * out and we can stop processing the current queue */ diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 53e52e1..66a9bf2 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -1669,6 +1669,8 @@ static void _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry, struct batadv_tt_orig_list_entry *orig_entry) { + lockdep_assert_held(&tt_global_entry->list_lock); + batadv_tt_global_size_dec(orig_entry->orig_node, tt_global_entry->common.vid); atomic_dec(&tt_global_entry->orig_list_count);

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[batman-adv] master: batman-adv: Add missing include rculist.h (1bd0558)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv On branch : master >--------------------------------------------------------------- commit 1bd0558d1404cd831acb87796d1c71e6a00f9278 Author: Sven Eckelmann <sven(a)narfation.org> Date: Mon Jun 22 09:23:40 2015 +0200 batman-adv: Add missing include rculist.h originator.c is using hlist_for_each_entry_rcu but did not include the required header for it. Reported-by: Marek Lindner <mareklindner(a)neomailbox.ch> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Signed-off-by: Marek Lindner <mareklindner(a)neomailbox.ch> >--------------------------------------------------------------- 1bd0558d1404cd831acb87796d1c71e6a00f9278 net/batman-adv/originator.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c index ce5e354..610620a 100644 --- a/net/batman-adv/originator.c +++ b/net/batman-adv/originator.c @@ -26,6 +26,7 @@ #include <linux/list.h> #include <linux/lockdep.h> #include <linux/netdevice.h> +#include <linux/rculist.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/spinlock.h>

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[batman-adv] master: batman-adv: convert bat_priv->tt.req_list to hlist (c5bcd65)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv On branch : master >--------------------------------------------------------------- commit c5bcd65170508a9ae81c12b77819be518fa17d08 Author: Marek Lindner <mareklindner(a)neomailbox.ch> Date: Sun Jun 28 22:16:06 2015 +0800 batman-adv: convert bat_priv->tt.req_list to hlist Since the list's tail is never accessed using a double linked list head wastes memory. Signed-off-by: Marek Lindner <mareklindner(a)neomailbox.ch> >--------------------------------------------------------------- c5bcd65170508a9ae81c12b77819be518fa17d08 net/batman-adv/main.c | 2 +- net/batman-adv/translation-table.c | 29 ++++++++++++++++------------- net/batman-adv/types.h | 4 ++-- 3 files changed, 19 insertions(+), 16 deletions(-) diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 40750cb..d277ba7 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -148,7 +148,7 @@ int batadv_mesh_init(struct net_device *soft_iface) INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); #endif INIT_LIST_HEAD(&bat_priv->tt.changes_list); - INIT_LIST_HEAD(&bat_priv->tt.req_list); + INIT_HLIST_HEAD(&bat_priv->tt.req_list); INIT_LIST_HEAD(&bat_priv->tt.roam_list); #ifdef CONFIG_BATMAN_ADV_MCAST INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 482d019..53e52e1 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -2221,12 +2221,13 @@ static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv, static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) { - struct batadv_tt_req_node *node, *safe; + struct batadv_tt_req_node *node; + struct hlist_node *safe; spin_lock_bh(&bat_priv->tt.req_list_lock); - list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { - list_del_init(&node->list); + hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { + hlist_del_init(&node->list); kfree(node); } @@ -2256,13 +2257,14 @@ static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, static void batadv_tt_req_purge(struct batadv_priv *bat_priv) { - struct batadv_tt_req_node *node, *safe; + struct batadv_tt_req_node *node; + struct hlist_node *safe; spin_lock_bh(&bat_priv->tt.req_list_lock); - list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { + hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { if (batadv_has_timed_out(node->issued_at, BATADV_TT_REQUEST_TIMEOUT)) { - list_del_init(&node->list); + hlist_del_init(&node->list); kfree(node); } } @@ -2284,7 +2286,7 @@ batadv_tt_req_node_new(struct batadv_priv *bat_priv, struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; spin_lock_bh(&bat_priv->tt.req_list_lock); - list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { + hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { if (batadv_compare_eth(tt_req_node_tmp, orig_node) && !batadv_has_timed_out(tt_req_node_tmp->issued_at, BATADV_TT_REQUEST_TIMEOUT)) @@ -2298,7 +2300,7 @@ batadv_tt_req_node_new(struct batadv_priv *bat_priv, ether_addr_copy(tt_req_node->addr, orig_node->orig); tt_req_node->issued_at = jiffies; - list_add(&tt_req_node->list, &bat_priv->tt.req_list); + hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list); unlock: spin_unlock_bh(&bat_priv->tt.req_list_lock); return tt_req_node; @@ -2549,8 +2551,8 @@ out: batadv_hardif_free_ref(primary_if); if (ret && tt_req_node) { spin_lock_bh(&bat_priv->tt.req_list_lock); - /* list_del_init() verifies tt_req_node still is in the list */ - list_del_init(&tt_req_node->list); + /* hlist_del_init() verifies tt_req_node still is in the list */ + hlist_del_init(&tt_req_node->list); spin_unlock_bh(&bat_priv->tt.req_list_lock); kfree(tt_req_node); } @@ -2946,7 +2948,8 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv, struct batadv_tvlv_tt_data *tt_data, u8 *resp_src, u16 num_entries) { - struct batadv_tt_req_node *node, *safe; + struct batadv_tt_req_node *node; + struct hlist_node *safe; struct batadv_orig_node *orig_node = NULL; struct batadv_tvlv_tt_change *tt_change; u8 *tvlv_ptr = (u8 *)tt_data; @@ -2984,10 +2987,10 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv, /* Delete the tt_req_node from pending tt_requests list */ spin_lock_bh(&bat_priv->tt.req_list_lock); - list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { + hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { if (!batadv_compare_eth(node->addr, resp_src)) continue; - list_del_init(&node->list); + hlist_del_init(&node->list); kfree(node); } diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index fe3695c..2f5e6c3 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -537,7 +537,7 @@ struct batadv_priv_tt { struct list_head changes_list; struct batadv_hashtable *local_hash; struct batadv_hashtable *global_hash; - struct list_head req_list; + struct hlist_head req_list; struct list_head roam_list; spinlock_t changes_list_lock; /* protects changes */ spinlock_t req_list_lock; /* protects req_list */ @@ -1006,7 +1006,7 @@ struct batadv_tt_change_node { struct batadv_tt_req_node { u8 addr[ETH_ALEN]; unsigned long issued_at; - struct list_head list; + struct hlist_node list; }; /**

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[batman-adv] master's head updated: Merge branch 'next' (e9eeb93)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv Branch 'master' now includes: 013aab3 batman-adv: Replace gw_reselect 64 bit div with shift a8c7689 Merge branch 'maint' into next e9eeb93 Merge branch 'next'

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[batman-adv] master: Merge branch 'next' (e9eeb93)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv On branch : master >--------------------------------------------------------------- commit e9eeb9371a60708f9650e473f7dc1a2b518baaee Merge: 56fd0ba a8c7689 Author: Marek Lindner <mareklindner(a)neomailbox.ch> Date: Fri Jul 10 16:15:01 2015 +0800 Merge branch 'next' Conflicts: net/batman-adv/gateway_client.c >--------------------------------------------------------------- e9eeb9371a60708f9650e473f7dc1a2b518baaee net/batman-adv/gateway_client.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --cc net/batman-adv/gateway_client.c index ef78c41,6012e2b..d7ca214 --- a/net/batman-adv/gateway_client.c +++ b/net/batman-adv/gateway_client.c @@@ -153,16 -153,11 +153,12 @@@ batadv_gw_get_best_gw_node(struct batad struct batadv_neigh_node *router; struct batadv_neigh_ifinfo *router_ifinfo; struct batadv_gw_node *gw_node, *curr_gw = NULL; - uint64_t max_gw_factor = 0, tmp_gw_factor = 0; - uint8_t max_tq = 0; - uint8_t tq_avg; + u64 max_gw_factor = 0; + u64 tmp_gw_factor = 0; - u32 gw_divisor; + u8 max_tq = 0; + u8 tq_avg; struct batadv_orig_node *orig_node; - gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE; - gw_divisor *= 64; - rcu_read_lock(); hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { if (gw_node->deleted)

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[batman-adv] next: Merge branch 'maint' into next (a8c7689)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv On branch : next >--------------------------------------------------------------- commit a8c7689669ab27af7da051df467704c4ea011a58 Merge: cc063e9 013aab3 Author: Marek Lindner <mareklindner(a)neomailbox.ch> Date: Fri Jul 10 16:12:42 2015 +0800 Merge branch 'maint' into next >--------------------------------------------------------------- a8c7689669ab27af7da051df467704c4ea011a58 net/batman-adv/gateway_client.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)

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[batman-adv] next's head updated: Merge branch 'maint' into next (a8c7689)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv Branch 'next' now includes: 013aab3 batman-adv: Replace gw_reselect 64 bit div with shift a8c7689 Merge branch 'maint' into next

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[batman-adv] maint: batman-adv: Replace gw_reselect 64 bit div with shift (013aab3)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv On branch : maint >--------------------------------------------------------------- commit 013aab341e246a565b1ba96557123a6b7b98e08d Author: Sven Eckelmann <sven(a)narfation.org> Date: Mon Jun 22 09:13:23 2015 +0200 batman-adv: Replace gw_reselect 64 bit div with shift The 64-bit gw_factor is divided by BATADV_TQ_LOCAL_WINDOW_SIZE ** 2 * 64. But the rest of the calculation has nothing to do with the tq window size end therefore the calculation is just (tmp_gw_factor / (64 ** 3)). The problem with 64 bit div is that it doesn't work on systems without native 64 bit div support. It has to be emulated using do_div or div_u64. The change in f63c54bba31d ("batman-adv: Avoid u32 overflow during gateway select") only compiled on such systems because the compiler converted the div to a (tmp_gw_factor >> 18). Making this explicit avoids having build problems in the future when BATADV_TQ_LOCAL_WINDOW_SIZE is changed in such a way that (BATADV_TQ_LOCAL_WINDOW_SIZE ** 2 * 64) is not a power of two. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Signed-off-by: Marek Lindner <mareklindner(a)neomailbox.ch> >--------------------------------------------------------------- 013aab341e246a565b1ba96557123a6b7b98e08d gateway_client.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/gateway_client.c b/gateway_client.c index d8e3ead..e395abe 100644 --- a/gateway_client.c +++ b/gateway_client.c @@ -134,14 +134,10 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) struct batadv_neigh_ifinfo *router_ifinfo; struct batadv_gw_node *gw_node, *curr_gw = NULL; uint64_t max_gw_factor = 0, tmp_gw_factor = 0; - uint32_t gw_divisor; uint8_t max_tq = 0; uint8_t tq_avg; struct batadv_orig_node *orig_node; - gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE; - gw_divisor *= 64; - rcu_read_lock(); hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { if (gw_node->deleted) @@ -167,7 +163,7 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) tmp_gw_factor = tq_avg * tq_avg; tmp_gw_factor *= gw_node->bandwidth_down; tmp_gw_factor *= 100 * 100; - tmp_gw_factor /= gw_divisor; + tmp_gw_factor >>= 18; if ((tmp_gw_factor > max_gw_factor) || ((tmp_gw_factor == max_gw_factor) &&

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[batman-adv] master: batman-adv: Fix gw_bandwidth calculation on 32 bit systems (56fd0ba)
by postmaster＠open-mesh.org 10 Jul '15

10 Jul '15

Repository : ssh://git@open-mesh.org/batman-adv On branch : master >--------------------------------------------------------------- commit 56fd0bab9c18f7ea5259f283af47f7464214d0f7 Author: Sven Eckelmann <sven(a)narfation.org> Date: Sun Jun 21 19:40:09 2015 +0200 batman-adv: Fix gw_bandwidth calculation on 32 bit systems The TVLV for the gw_bandwidth stores everything as u32. But the gw_bandwidth reads the signed long which limits the maximum value to (2 ** 31 - 1) on systems with 4 byte long. Also the input value is always converted from either Mibit/s or Kibit/s to 100Kibit/s. This reduces the values even further when the user sets it via the default unit Kibit/s. It may even cause an integer overflow and end up with a value the user never intended. Instead read the values as u64, check for possible overflows, do the unit adjustments and then reduce the size to u32. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Signed-off-by: Marek Lindner <mareklindner(a)neomailbox.ch> >--------------------------------------------------------------- 56fd0bab9c18f7ea5259f283af47f7464214d0f7 net/batman-adv/gateway_common.c | 49 +++++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 7 deletions(-) diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c index 6b930a6..0cb5e6b 100644 --- a/net/batman-adv/gateway_common.c +++ b/net/batman-adv/gateway_common.c @@ -22,6 +22,7 @@ #include <linux/errno.h> #include <linux/byteorder/generic.h> #include <linux/kernel.h> +#include <linux/math64.h> #include <linux/netdevice.h> #include <linux/stddef.h> #include <linux/string.h> @@ -44,7 +45,7 @@ static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, { enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT; char *slash_ptr, *tmp_ptr; - long ldown, lup; + u64 ldown, lup; int ret; slash_ptr = strchr(buff, '/'); @@ -62,7 +63,7 @@ static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, *tmp_ptr = '\0'; } - ret = kstrtol(buff, 10, &ldown); + ret = kstrtou64(buff, 10, &ldown); if (ret) { batadv_err(net_dev, "Download speed of gateway mode invalid: %s\n", @@ -72,14 +73,31 @@ static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, switch (bw_unit_type) { case BATADV_BW_UNIT_MBIT: - *down = ldown * 10; + /* prevent overflow */ + if (U64_MAX / 10 < ldown) { + batadv_err(net_dev, + "Download speed of gateway mode too large: %s\n", + buff); + return false; + } + + ldown *= 10; break; case BATADV_BW_UNIT_KBIT: default: - *down = ldown / 100; + ldown = div_u64(ldown, 100); break; } + if (U32_MAX < ldown) { + batadv_err(net_dev, + "Download speed of gateway mode too large: %s\n", + buff); + return false; + } + + *down = ldown; + /* we also got some upload info */ if (slash_ptr) { bw_unit_type = BATADV_BW_UNIT_KBIT; @@ -95,7 +113,7 @@ static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, *tmp_ptr = '\0'; } - ret = kstrtol(slash_ptr + 1, 10, &lup); + ret = kstrtou64(slash_ptr + 1, 10, &lup); if (ret) { batadv_err(net_dev, "Upload speed of gateway mode invalid: %s\n", @@ -105,13 +123,30 @@ static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, switch (bw_unit_type) { case BATADV_BW_UNIT_MBIT: - *up = lup * 10; + /* prevent overflow */ + if (U64_MAX / 10 < lup) { + batadv_err(net_dev, + "Upload speed of gateway mode too large: %s\n", + slash_ptr + 1); + return false; + } + + lup *= 10; break; case BATADV_BW_UNIT_KBIT: default: - *up = lup / 100; + lup = div_u64(lup, 100); break; } + + if (U32_MAX < lup) { + batadv_err(net_dev, + "Upload speed of gateway mode too large: %s\n", + slash_ptr + 1); + return false; + } + + *up = lup; } return true;

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commits July 2015