B.A.T.M.A.N June 2020

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

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25 discussions

NS-3 module for batman-adv
by Rahul Bothra 18 Jun '20

18 Jun '20

Hi, I'm working on developing an NS-3 module for batman-adv (and possibly for batmand). Has some work been done on this before, so that I can avoid re-writing the same? Internet search results were incomplete or broken attempts for the same. Thanks Rahul Bothra

1 0

[PATCH v2] mac80211: mesh: add mesh_param "mesh_nolearn" to skip path discovery
by Linus Lüssing 17 Jun '20

17 Jun '20

From: Linus Lüssing <ll(a)simonwunderlich.de> Currently, before being able to forward a packet between two 802.11s nodes, both a PLINK handshake is performed upon receiving a beacon and then later a PREQ/PREP exchange for path discovery is performed on demand upon receiving a data frame to forward. When running a mesh protocol on top of an 802.11s interface, like batman-adv, we do not need the multi-hop mesh routing capabilities of 802.11s and usually set mesh_fwding=0. However, even with mesh_fwding=0 the PREQ/PREP path discovery is still performed on demand. Even though in this scenario the next hop PREQ/PREP will determine is always the direct 11s neighbor node. The new mesh_nolearn parameter allows to skip the PREQ/PREP exchange in this scenario, leading to a reduced delay, reduced packet buffering and simplifies HWMP in general. mesh_nolearn is still rather conservative in that if the packet destination is not a direct 11s neighbor, it will fall back to PREQ/PREP path discovery. For normal, multi-hop 802.11s mesh routing it is usually not advisable to enable mesh_nolearn as a transmission to a direct but distant neighbor might be worse than reaching that same node via a more robust / higher throughput etc. multi-hop path. Cc: Sven Eckelmann <sven(a)narfation.org> Cc: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Linus Lüssing <ll(a)simonwunderlich.de> --- Changelog v2: * moved nolearn lookup closer into the actual nexthop_lookup function, so that the nolearn feature is not confusingly avoided on forwarded frames include/net/cfg80211.h | 6 ++++++ include/uapi/linux/nl80211.h | 7 +++++++ net/mac80211/cfg.c | 2 ++ net/mac80211/debugfs_netdev.c | 2 ++ net/mac80211/mesh_hwmp.c | 39 +++++++++++++++++++++++++++++++++++ net/wireless/mesh.c | 1 + net/wireless/nl80211.c | 8 ++++++- net/wireless/trace.h | 4 +++- 8 files changed, 67 insertions(+), 2 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index fc7e8807838d..5ffb35592a23 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -1853,6 +1853,11 @@ struct bss_parameters { * connected to a mesh gate in mesh formation info. If false, the * value in mesh formation is determined by the presence of root paths * in the mesh path table + * @dot11MeshNolearn: Try to avoid multi-hop path discovery (e.g. PREQ/PREP + * for HWMP) if the destination is a direct neighbor. Note that this might + * not be the optimal decision as a multi-hop route might be better. So + * if using this setting you will likely also want to disable + * dot11MeshForwarding and use another mesh routing protocol on top. */ struct mesh_config { u16 dot11MeshRetryTimeout; @@ -1884,6 +1889,7 @@ struct mesh_config { enum nl80211_mesh_power_mode power_mode; u16 dot11MeshAwakeWindowDuration; u32 plink_timeout; + bool dot11MeshNolearn; }; /** diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 4e6339ab1fce..f6560bb9644c 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -4236,6 +4236,12 @@ enum nl80211_mesh_power_mode { * field. If left unset then the mesh formation field will only * advertise such if there is an active root mesh path. * + * @NL80211_MESHCONF_NOLEARN: Try to avoid multi-hop path discovery (e.g. + * PREQ/PREP for HWMP) if the destination is a direct neighbor. Note that + * this might not be the optimal decision as a multi-hop route might be + * better. So if using this setting you will likely also want to disable + * dot11MeshForwarding and use another mesh routing protocol on top. + * * @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use */ enum nl80211_meshconf_params { @@ -4269,6 +4275,7 @@ enum nl80211_meshconf_params { NL80211_MESHCONF_AWAKE_WINDOW, NL80211_MESHCONF_PLINK_TIMEOUT, NL80211_MESHCONF_CONNECTED_TO_GATE, + NL80211_MESHCONF_NOLEARN, /* keep last */ __NL80211_MESHCONF_ATTR_AFTER_LAST, diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 9b360544ad6f..f48e095e912a 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -2126,6 +2126,8 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy, if (_chg_mesh_attr(NL80211_MESHCONF_CONNECTED_TO_GATE, mask)) conf->dot11MeshConnectedToMeshGate = nconf->dot11MeshConnectedToMeshGate; + if (_chg_mesh_attr(NL80211_MESHCONF_NOLEARN, mask)) + conf->dot11MeshNolearn = nconf->dot11MeshNolearn; ieee80211_mbss_info_change_notify(sdata, BSS_CHANGED_BEACON); return 0; } diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c index d7e955127d5c..09eab2c3f380 100644 --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -638,6 +638,7 @@ IEEE80211_IF_FILE(dot11MeshAwakeWindowDuration, u.mesh.mshcfg.dot11MeshAwakeWindowDuration, DEC); IEEE80211_IF_FILE(dot11MeshConnectedToMeshGate, u.mesh.mshcfg.dot11MeshConnectedToMeshGate, DEC); +IEEE80211_IF_FILE(dot11MeshNolearn, u.mesh.mshcfg.dot11MeshNolearn, DEC); #endif #define DEBUGFS_ADD_MODE(name, mode) \ @@ -762,6 +763,7 @@ static void add_mesh_config(struct ieee80211_sub_if_data *sdata) MESHPARAMS_ADD(power_mode); MESHPARAMS_ADD(dot11MeshAwakeWindowDuration); MESHPARAMS_ADD(dot11MeshConnectedToMeshGate); + MESHPARAMS_ADD(dot11MeshNolearn); #undef MESHPARAMS_ADD } #endif diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index aa5150929996..615db30b765a 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -1175,6 +1175,40 @@ int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, return -ENOENT; } +/** + * mesh_nexthop_lookup_nolearn - try to set next hop without path discovery + * @skb: 802.11 frame to be sent + * @sdata: network subif the frame will be sent through + * + * Check if the meshDA (addr3) of a unicast frame is a direct neighbor. + * And if so, set the RA (addr1) to it to transmit to this node directly, + * avoiding PREP/PREP path discovery. + * + * Returns: 0 if the next hop was found and -ENOENT otherwise. + */ +static int mesh_nexthop_lookup_nolearn(struct ieee80211_sub_if_data *sdata, + struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct sta_info *sta; + + if (is_multicast_ether_addr(hdr->addr1)) + return -ENOENT; + + rcu_read_lock(); + sta = sta_info_get(sdata, hdr->addr3); + + if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { + rcu_read_unlock(); + return -ENOENT; + } + rcu_read_unlock(); + + memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); + memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); + return 0; +} + /** * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling * this function is considered "using" the associated mpath, so preempt a path @@ -1188,11 +1222,16 @@ int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct mesh_path *mpath; struct sta_info *next_hop; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; u8 *target_addr = hdr->addr3; + if (ifmsh->mshcfg.dot11MeshNolearn && + !mesh_nexthop_lookup_nolearn(sdata, skb)) + return 0; + mpath = mesh_path_lookup(sdata, target_addr); if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) return -ENOENT; diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c index eac5aa1419fc..e4e363138279 100644 --- a/net/wireless/mesh.c +++ b/net/wireless/mesh.c @@ -78,6 +78,7 @@ const struct mesh_config default_mesh_config = { .power_mode = NL80211_MESH_POWER_ACTIVE, .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW, .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT, + .dot11MeshNolearn = false, }; const struct mesh_setup default_mesh_setup = { diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 263ae395ad44..b0b7f110064f 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -6884,7 +6884,9 @@ static int nl80211_get_mesh_config(struct sk_buff *skb, nla_put_u32(msg, NL80211_MESHCONF_PLINK_TIMEOUT, cur_params.plink_timeout) || nla_put_u8(msg, NL80211_MESHCONF_CONNECTED_TO_GATE, - cur_params.dot11MeshConnectedToMeshGate)) + cur_params.dot11MeshConnectedToMeshGate) || + nla_put_u8(msg, NL80211_MESHCONF_NOLEARN, + cur_params.dot11MeshNolearn)) goto nla_put_failure; nla_nest_end(msg, pinfoattr); genlmsg_end(msg, hdr); @@ -6942,6 +6944,7 @@ nl80211_meshconf_params_policy[NL80211_MESHCONF_ATTR_MAX+1] = { [NL80211_MESHCONF_AWAKE_WINDOW] = { .type = NLA_U16 }, [NL80211_MESHCONF_PLINK_TIMEOUT] = { .type = NLA_U32 }, [NL80211_MESHCONF_CONNECTED_TO_GATE] = NLA_POLICY_RANGE(NLA_U8, 0, 1), + [NL80211_MESHCONF_NOLEARN] = { .type = NLA_U8 }, }; static const struct nla_policy @@ -7093,6 +7096,9 @@ do { \ NL80211_MESHCONF_AWAKE_WINDOW, nla_get_u16); FILL_IN_MESH_PARAM_IF_SET(tb, cfg, plink_timeout, mask, NL80211_MESHCONF_PLINK_TIMEOUT, nla_get_u32); + FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshNolearn, 0, 1, + mask, NL80211_MESHCONF_NOLEARN, + nl80211_check_bool); if (mask_out) *mask_out = mask; diff --git a/net/wireless/trace.h b/net/wireless/trace.h index b23cab016521..6e218a0acd4e 100644 --- a/net/wireless/trace.h +++ b/net/wireless/trace.h @@ -68,7 +68,8 @@ __field(u16, ht_opmode) \ __field(u32, dot11MeshHWMPactivePathToRootTimeout) \ __field(u16, dot11MeshHWMProotInterval) \ - __field(u16, dot11MeshHWMPconfirmationInterval) + __field(u16, dot11MeshHWMPconfirmationInterval) \ + __field(bool, dot11MeshNolearn) #define MESH_CFG_ASSIGN \ do { \ __entry->dot11MeshRetryTimeout = conf->dot11MeshRetryTimeout; \ @@ -109,6 +110,7 @@ conf->dot11MeshHWMProotInterval; \ __entry->dot11MeshHWMPconfirmationInterval = \ conf->dot11MeshHWMPconfirmationInterval; \ + __entry->dot11MeshNolearn = conf->dot11MeshNolearn; \ } while (0) #define CHAN_ENTRY __field(enum nl80211_band, band) \ -- 2.27.0

2 4

[PATCH] mac80211: mesh: add mesh_param "mesh_nolearn" to skip path discovery
by Linus Lüssing 17 Jun '20

17 Jun '20

From: Linus Lüssing <ll(a)simonwunderlich.de> Currently, before being able to forward a packet between two 802.11s nodes, both a PLINK handshake is performed upon receiving a beacon and then later a PREQ/PREP exchange for path discovery is performed on demand upon receiving a data frame to forward. When running a mesh protocol on top of an 802.11s interface, like batman-adv, we do not need the multi-hop mesh routing capabilities of 802.11s and usually set mesh_fwding=0. However, even with mesh_fwding=0 the PREQ/PREP path discovery is still performed on demand. Even though in this scenario the next hop PREQ/PREP will determine is always the direct 11s neighbor node. The new mesh_nolearn parameter allows to skip the PREQ/PREP exchange in this scenario, leading to a reduced delay, reduced packet buffering and simplifies HWMP in general. mesh_nolearn is still rather conservative in that if the packet destination is not a direct 11s neighbor, it will fall back to PREQ/PREP path discovery. For normal, multi-hop 802.11s mesh routing it is usually not advisable to enable mesh_nolearn as a transmission to a direct but distant neighbor might be worse than reaching that same node via a more robust / higher throughput etc. multi-hop path. Cc: Sven Eckelmann <sven(a)narfation.org> Cc: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Linus Lüssing <ll(a)simonwunderlich.de> --- include/net/cfg80211.h | 6 ++++++ include/uapi/linux/nl80211.h | 7 +++++++ net/mac80211/cfg.c | 2 ++ net/mac80211/debugfs_netdev.c | 2 ++ net/mac80211/mesh_hwmp.c | 39 +++++++++++++++++++++++++++++++++++ net/wireless/mesh.c | 1 + net/wireless/nl80211.c | 8 ++++++- net/wireless/trace.h | 4 +++- 8 files changed, 67 insertions(+), 2 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index fc7e8807838d..5ffb35592a23 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -1853,6 +1853,11 @@ struct bss_parameters { * connected to a mesh gate in mesh formation info. If false, the * value in mesh formation is determined by the presence of root paths * in the mesh path table + * @dot11MeshNolearn: Try to avoid multi-hop path discovery (e.g. PREQ/PREP + * for HWMP) if the destination is a direct neighbor. Note that this might + * not be the optimal decision as a multi-hop route might be better. So + * if using this setting you will likely also want to disable + * dot11MeshForwarding and use another mesh routing protocol on top. */ struct mesh_config { u16 dot11MeshRetryTimeout; @@ -1884,6 +1889,7 @@ struct mesh_config { enum nl80211_mesh_power_mode power_mode; u16 dot11MeshAwakeWindowDuration; u32 plink_timeout; + bool dot11MeshNolearn; }; /** diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 4e6339ab1fce..f6560bb9644c 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -4236,6 +4236,12 @@ enum nl80211_mesh_power_mode { * field. If left unset then the mesh formation field will only * advertise such if there is an active root mesh path. * + * @NL80211_MESHCONF_NOLEARN: Try to avoid multi-hop path discovery (e.g. + * PREQ/PREP for HWMP) if the destination is a direct neighbor. Note that + * this might not be the optimal decision as a multi-hop route might be + * better. So if using this setting you will likely also want to disable + * dot11MeshForwarding and use another mesh routing protocol on top. + * * @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use */ enum nl80211_meshconf_params { @@ -4269,6 +4275,7 @@ enum nl80211_meshconf_params { NL80211_MESHCONF_AWAKE_WINDOW, NL80211_MESHCONF_PLINK_TIMEOUT, NL80211_MESHCONF_CONNECTED_TO_GATE, + NL80211_MESHCONF_NOLEARN, /* keep last */ __NL80211_MESHCONF_ATTR_AFTER_LAST, diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 9b360544ad6f..f48e095e912a 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -2126,6 +2126,8 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy, if (_chg_mesh_attr(NL80211_MESHCONF_CONNECTED_TO_GATE, mask)) conf->dot11MeshConnectedToMeshGate = nconf->dot11MeshConnectedToMeshGate; + if (_chg_mesh_attr(NL80211_MESHCONF_NOLEARN, mask)) + conf->dot11MeshNolearn = nconf->dot11MeshNolearn; ieee80211_mbss_info_change_notify(sdata, BSS_CHANGED_BEACON); return 0; } diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c index d7e955127d5c..09eab2c3f380 100644 --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -638,6 +638,7 @@ IEEE80211_IF_FILE(dot11MeshAwakeWindowDuration, u.mesh.mshcfg.dot11MeshAwakeWindowDuration, DEC); IEEE80211_IF_FILE(dot11MeshConnectedToMeshGate, u.mesh.mshcfg.dot11MeshConnectedToMeshGate, DEC); +IEEE80211_IF_FILE(dot11MeshNolearn, u.mesh.mshcfg.dot11MeshNolearn, DEC); #endif #define DEBUGFS_ADD_MODE(name, mode) \ @@ -762,6 +763,7 @@ static void add_mesh_config(struct ieee80211_sub_if_data *sdata) MESHPARAMS_ADD(power_mode); MESHPARAMS_ADD(dot11MeshAwakeWindowDuration); MESHPARAMS_ADD(dot11MeshConnectedToMeshGate); + MESHPARAMS_ADD(dot11MeshNolearn); #undef MESHPARAMS_ADD } #endif diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index aa5150929996..cbf94c0b408f 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -1117,6 +1117,40 @@ void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) kfree(preq_node); } +/** + * mesh_nexthop_resolve_nolearn - try to set next hop without path discovery + * @skb: 802.11 frame to be sent + * @sdata: network subif the frame will be sent through + * + * Check if the meshDA (addr3) of a unicast frame is a direct neighbor. + * And if so, set the RA (addr1) to it to transmit to this node directly, + * avoiding PREP/PREP path discovery. + * + * Returns: 0 if the next hop was found and -ENOENT otherwise. + */ +static int mesh_nexthop_resolve_nolearn(struct ieee80211_sub_if_data *sdata, + struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct sta_info *sta; + + if (is_multicast_ether_addr(hdr->addr1)) + return -ENOENT; + + rcu_read_lock(); + sta = sta_info_get(sdata, hdr->addr3); + + if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { + rcu_read_unlock(); + return -ENOENT; + } + rcu_read_unlock(); + + memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); + memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); + return 0; +} + /** * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery * @@ -1132,6 +1166,7 @@ void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct mesh_path *mpath; @@ -1146,6 +1181,10 @@ int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, if (info->control.flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) return 0; + if (ifmsh->mshcfg.dot11MeshNolearn && + !mesh_nexthop_resolve_nolearn(sdata, skb)) + return 0; + if (!mesh_nexthop_lookup(sdata, skb)) return 0; diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c index eac5aa1419fc..e4e363138279 100644 --- a/net/wireless/mesh.c +++ b/net/wireless/mesh.c @@ -78,6 +78,7 @@ const struct mesh_config default_mesh_config = { .power_mode = NL80211_MESH_POWER_ACTIVE, .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW, .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT, + .dot11MeshNolearn = false, }; const struct mesh_setup default_mesh_setup = { diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 263ae395ad44..b0b7f110064f 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -6884,7 +6884,9 @@ static int nl80211_get_mesh_config(struct sk_buff *skb, nla_put_u32(msg, NL80211_MESHCONF_PLINK_TIMEOUT, cur_params.plink_timeout) || nla_put_u8(msg, NL80211_MESHCONF_CONNECTED_TO_GATE, - cur_params.dot11MeshConnectedToMeshGate)) + cur_params.dot11MeshConnectedToMeshGate) || + nla_put_u8(msg, NL80211_MESHCONF_NOLEARN, + cur_params.dot11MeshNolearn)) goto nla_put_failure; nla_nest_end(msg, pinfoattr); genlmsg_end(msg, hdr); @@ -6942,6 +6944,7 @@ nl80211_meshconf_params_policy[NL80211_MESHCONF_ATTR_MAX+1] = { [NL80211_MESHCONF_AWAKE_WINDOW] = { .type = NLA_U16 }, [NL80211_MESHCONF_PLINK_TIMEOUT] = { .type = NLA_U32 }, [NL80211_MESHCONF_CONNECTED_TO_GATE] = NLA_POLICY_RANGE(NLA_U8, 0, 1), + [NL80211_MESHCONF_NOLEARN] = { .type = NLA_U8 }, }; static const struct nla_policy @@ -7093,6 +7096,9 @@ do { \ NL80211_MESHCONF_AWAKE_WINDOW, nla_get_u16); FILL_IN_MESH_PARAM_IF_SET(tb, cfg, plink_timeout, mask, NL80211_MESHCONF_PLINK_TIMEOUT, nla_get_u32); + FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshNolearn, 0, 1, + mask, NL80211_MESHCONF_NOLEARN, + nl80211_check_bool); if (mask_out) *mask_out = mask; diff --git a/net/wireless/trace.h b/net/wireless/trace.h index b23cab016521..6e218a0acd4e 100644 --- a/net/wireless/trace.h +++ b/net/wireless/trace.h @@ -68,7 +68,8 @@ __field(u16, ht_opmode) \ __field(u32, dot11MeshHWMPactivePathToRootTimeout) \ __field(u16, dot11MeshHWMProotInterval) \ - __field(u16, dot11MeshHWMPconfirmationInterval) + __field(u16, dot11MeshHWMPconfirmationInterval) \ + __field(bool, dot11MeshNolearn) #define MESH_CFG_ASSIGN \ do { \ __entry->dot11MeshRetryTimeout = conf->dot11MeshRetryTimeout; \ @@ -109,6 +110,7 @@ conf->dot11MeshHWMProotInterval; \ __entry->dot11MeshHWMPconfirmationInterval = \ conf->dot11MeshHWMPconfirmationInterval; \ + __entry->dot11MeshNolearn = conf->dot11MeshNolearn; \ } while (0) #define CHAN_ENTRY __field(enum nl80211_band, band) \ -- 2.27.0

2 3

[PATCH v3] mac80211: mesh: add mesh_param "mesh_nolearn" to skip path discovery
by Linus Lüssing 17 Jun '20

17 Jun '20

From: Linus Lüssing <ll(a)simonwunderlich.de> Currently, before being able to forward a packet between two 802.11s nodes, both a PLINK handshake is performed upon receiving a beacon and then later a PREQ/PREP exchange for path discovery is performed on demand upon receiving a data frame to forward. When running a mesh protocol on top of an 802.11s interface, like batman-adv, we do not need the multi-hop mesh routing capabilities of 802.11s and usually set mesh_fwding=0. However, even with mesh_fwding=0 the PREQ/PREP path discovery is still performed on demand. Even though in this scenario the next hop PREQ/PREP will determine is always the direct 11s neighbor node. The new mesh_nolearn parameter allows to skip the PREQ/PREP exchange in this scenario, leading to a reduced delay, reduced packet buffering and simplifies HWMP in general. mesh_nolearn is still rather conservative in that if the packet destination is not a direct 11s neighbor, it will fall back to PREQ/PREP path discovery. For normal, multi-hop 802.11s mesh routing it is usually not advisable to enable mesh_nolearn as a transmission to a direct but distant neighbor might be worse than reaching that same node via a more robust / higher throughput etc. multi-hop path. Cc: Sven Eckelmann <sven(a)narfation.org> Cc: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Linus Lüssing <ll(a)simonwunderlich.de> --- Changelog v3: * fixing typo in mesh_nexthop_lookup_nolearn() kerneldoc ("PREP/PREP" -> "PREQ/PREP") * fixing FILL_IN_MESH_PARAM_IF_SET() invocation Changelog v2: * moved nolearn lookup closer into the actual nexthop_lookup function, so that the nolearn feature is not confusingly avoided on forwarded frames include/net/cfg80211.h | 6 ++++++ include/uapi/linux/nl80211.h | 7 +++++++ net/mac80211/cfg.c | 2 ++ net/mac80211/debugfs_netdev.c | 2 ++ net/mac80211/mesh_hwmp.c | 39 +++++++++++++++++++++++++++++++++++ net/wireless/mesh.c | 1 + net/wireless/nl80211.c | 7 ++++++- net/wireless/trace.h | 4 +++- 8 files changed, 66 insertions(+), 2 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index fc7e8807838d..5ffb35592a23 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -1853,6 +1853,11 @@ struct bss_parameters { * connected to a mesh gate in mesh formation info. If false, the * value in mesh formation is determined by the presence of root paths * in the mesh path table + * @dot11MeshNolearn: Try to avoid multi-hop path discovery (e.g. PREQ/PREP + * for HWMP) if the destination is a direct neighbor. Note that this might + * not be the optimal decision as a multi-hop route might be better. So + * if using this setting you will likely also want to disable + * dot11MeshForwarding and use another mesh routing protocol on top. */ struct mesh_config { u16 dot11MeshRetryTimeout; @@ -1884,6 +1889,7 @@ struct mesh_config { enum nl80211_mesh_power_mode power_mode; u16 dot11MeshAwakeWindowDuration; u32 plink_timeout; + bool dot11MeshNolearn; }; /** diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 4e6339ab1fce..f6560bb9644c 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -4236,6 +4236,12 @@ enum nl80211_mesh_power_mode { * field. If left unset then the mesh formation field will only * advertise such if there is an active root mesh path. * + * @NL80211_MESHCONF_NOLEARN: Try to avoid multi-hop path discovery (e.g. + * PREQ/PREP for HWMP) if the destination is a direct neighbor. Note that + * this might not be the optimal decision as a multi-hop route might be + * better. So if using this setting you will likely also want to disable + * dot11MeshForwarding and use another mesh routing protocol on top. + * * @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use */ enum nl80211_meshconf_params { @@ -4269,6 +4275,7 @@ enum nl80211_meshconf_params { NL80211_MESHCONF_AWAKE_WINDOW, NL80211_MESHCONF_PLINK_TIMEOUT, NL80211_MESHCONF_CONNECTED_TO_GATE, + NL80211_MESHCONF_NOLEARN, /* keep last */ __NL80211_MESHCONF_ATTR_AFTER_LAST, diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 9b360544ad6f..f48e095e912a 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -2126,6 +2126,8 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy, if (_chg_mesh_attr(NL80211_MESHCONF_CONNECTED_TO_GATE, mask)) conf->dot11MeshConnectedToMeshGate = nconf->dot11MeshConnectedToMeshGate; + if (_chg_mesh_attr(NL80211_MESHCONF_NOLEARN, mask)) + conf->dot11MeshNolearn = nconf->dot11MeshNolearn; ieee80211_mbss_info_change_notify(sdata, BSS_CHANGED_BEACON); return 0; } diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c index d7e955127d5c..09eab2c3f380 100644 --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -638,6 +638,7 @@ IEEE80211_IF_FILE(dot11MeshAwakeWindowDuration, u.mesh.mshcfg.dot11MeshAwakeWindowDuration, DEC); IEEE80211_IF_FILE(dot11MeshConnectedToMeshGate, u.mesh.mshcfg.dot11MeshConnectedToMeshGate, DEC); +IEEE80211_IF_FILE(dot11MeshNolearn, u.mesh.mshcfg.dot11MeshNolearn, DEC); #endif #define DEBUGFS_ADD_MODE(name, mode) \ @@ -762,6 +763,7 @@ static void add_mesh_config(struct ieee80211_sub_if_data *sdata) MESHPARAMS_ADD(power_mode); MESHPARAMS_ADD(dot11MeshAwakeWindowDuration); MESHPARAMS_ADD(dot11MeshConnectedToMeshGate); + MESHPARAMS_ADD(dot11MeshNolearn); #undef MESHPARAMS_ADD } #endif diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index aa5150929996..76745b206658 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -1175,6 +1175,40 @@ int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, return -ENOENT; } +/** + * mesh_nexthop_lookup_nolearn - try to set next hop without path discovery + * @skb: 802.11 frame to be sent + * @sdata: network subif the frame will be sent through + * + * Check if the meshDA (addr3) of a unicast frame is a direct neighbor. + * And if so, set the RA (addr1) to it to transmit to this node directly, + * avoiding PREQ/PREP path discovery. + * + * Returns: 0 if the next hop was found and -ENOENT otherwise. + */ +static int mesh_nexthop_lookup_nolearn(struct ieee80211_sub_if_data *sdata, + struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct sta_info *sta; + + if (is_multicast_ether_addr(hdr->addr1)) + return -ENOENT; + + rcu_read_lock(); + sta = sta_info_get(sdata, hdr->addr3); + + if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { + rcu_read_unlock(); + return -ENOENT; + } + rcu_read_unlock(); + + memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); + memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); + return 0; +} + /** * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling * this function is considered "using" the associated mpath, so preempt a path @@ -1188,11 +1222,16 @@ int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct mesh_path *mpath; struct sta_info *next_hop; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; u8 *target_addr = hdr->addr3; + if (ifmsh->mshcfg.dot11MeshNolearn && + !mesh_nexthop_lookup_nolearn(sdata, skb)) + return 0; + mpath = mesh_path_lookup(sdata, target_addr); if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) return -ENOENT; diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c index eac5aa1419fc..e4e363138279 100644 --- a/net/wireless/mesh.c +++ b/net/wireless/mesh.c @@ -78,6 +78,7 @@ const struct mesh_config default_mesh_config = { .power_mode = NL80211_MESH_POWER_ACTIVE, .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW, .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT, + .dot11MeshNolearn = false, }; const struct mesh_setup default_mesh_setup = { diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 263ae395ad44..43b28bab2e64 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -6884,7 +6884,9 @@ static int nl80211_get_mesh_config(struct sk_buff *skb, nla_put_u32(msg, NL80211_MESHCONF_PLINK_TIMEOUT, cur_params.plink_timeout) || nla_put_u8(msg, NL80211_MESHCONF_CONNECTED_TO_GATE, - cur_params.dot11MeshConnectedToMeshGate)) + cur_params.dot11MeshConnectedToMeshGate) || + nla_put_u8(msg, NL80211_MESHCONF_NOLEARN, + cur_params.dot11MeshNolearn)) goto nla_put_failure; nla_nest_end(msg, pinfoattr); genlmsg_end(msg, hdr); @@ -6942,6 +6944,7 @@ nl80211_meshconf_params_policy[NL80211_MESHCONF_ATTR_MAX+1] = { [NL80211_MESHCONF_AWAKE_WINDOW] = { .type = NLA_U16 }, [NL80211_MESHCONF_PLINK_TIMEOUT] = { .type = NLA_U32 }, [NL80211_MESHCONF_CONNECTED_TO_GATE] = NLA_POLICY_RANGE(NLA_U8, 0, 1), + [NL80211_MESHCONF_NOLEARN] = { .type = NLA_U8 }, }; static const struct nla_policy @@ -7093,6 +7096,8 @@ do { \ NL80211_MESHCONF_AWAKE_WINDOW, nla_get_u16); FILL_IN_MESH_PARAM_IF_SET(tb, cfg, plink_timeout, mask, NL80211_MESHCONF_PLINK_TIMEOUT, nla_get_u32); + FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshNolearn, mask, + NL80211_MESHCONF_NOLEARN, nla_get_u8); if (mask_out) *mask_out = mask; diff --git a/net/wireless/trace.h b/net/wireless/trace.h index b23cab016521..6e218a0acd4e 100644 --- a/net/wireless/trace.h +++ b/net/wireless/trace.h @@ -68,7 +68,8 @@ __field(u16, ht_opmode) \ __field(u32, dot11MeshHWMPactivePathToRootTimeout) \ __field(u16, dot11MeshHWMProotInterval) \ - __field(u16, dot11MeshHWMPconfirmationInterval) + __field(u16, dot11MeshHWMPconfirmationInterval) \ + __field(bool, dot11MeshNolearn) #define MESH_CFG_ASSIGN \ do { \ __entry->dot11MeshRetryTimeout = conf->dot11MeshRetryTimeout; \ @@ -109,6 +110,7 @@ conf->dot11MeshHWMProotInterval; \ __entry->dot11MeshHWMPconfirmationInterval = \ conf->dot11MeshHWMPconfirmationInterval; \ + __entry->dot11MeshNolearn = conf->dot11MeshNolearn; \ } while (0) #define CHAN_ENTRY __field(enum nl80211_band, band) \ -- 2.27.0

1 1

KASAN: use-after-free Write in fsnotify_detach_connector_from_object
by syzbot 15 Jun '20

15 Jun '20

Hello, syzbot found the following crash on: HEAD commit: 7ae77150 Merge tag 'powerpc-5.8-1' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=120b26c1100000 kernel config: https://syzkaller.appspot.com/x/.config?x=d195fe572fb15312 dashboard link: https://syzkaller.appspot.com/bug?extid=7d2debdcdb3cb93c1e5e compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1724b246100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14ceb3de100000 The bug was bisected to: commit 76313c70c52f930af4afd21684509ca52297ea71 Author: Eric W. Biederman <ebiederm(a)xmission.com> Date: Wed Feb 19 16:37:15 2020 +0000 uml: Create a private mount of proc for mconsole bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=117c4912100000 final crash: https://syzkaller.appspot.com/x/report.txt?x=137c4912100000 console output: https://syzkaller.appspot.com/x/log.txt?x=157c4912100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+7d2debdcdb3cb93c1e5e(a)syzkaller.appspotmail.com Fixes: 76313c70c52f ("uml: Create a private mount of proc for mconsole") ================================================================== BUG: KASAN: use-after-free in atomic64_inc include/asm-generic/atomic-instrumented.h:1049 [inline] BUG: KASAN: use-after-free in atomic_long_inc include/asm-generic/atomic-long.h:160 [inline] BUG: KASAN: use-after-free in fsnotify_detach_connector_from_object+0x25e/0x380 fs/notify/mark.c:185 Write of size 8 at addr ffff88809fd7e7c0 by task syz-executor972/8021 CPU: 1 PID: 8021 Comm: syz-executor972 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x141/0x190 mm/kasan/generic.c:192 atomic64_inc include/asm-generic/atomic-instrumented.h:1049 [inline] atomic_long_inc include/asm-generic/atomic-long.h:160 [inline] fsnotify_detach_connector_from_object+0x25e/0x380 fs/notify/mark.c:185 fsnotify_put_mark+0x367/0x580 fs/notify/mark.c:250 fsnotify_clear_marks_by_group+0x33f/0x490 fs/notify/mark.c:764 fsnotify_destroy_group+0xc9/0x300 fs/notify/group.c:61 inotify_release+0x33/0x40 fs/notify/inotify/inotify_user.c:271 __fput+0x33e/0x880 fs/file_table.c:281 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xb3f/0x2de0 kernel/exit.c:806 do_group_exit+0x125/0x340 kernel/exit.c:904 __do_sys_exit_group kernel/exit.c:915 [inline] __se_sys_exit_group kernel/exit.c:913 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:913 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x445448 Code: Bad RIP value. RSP: 002b:00007ffe48521018 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445448 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000004cca90 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 00007ffe48521060 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006e0340 R14: 0000000000000007 R15: 000000000000002d Allocated by task 8026: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] alloc_super+0x52/0x9d0 fs/super.c:203 sget_fc+0x13f/0x790 fs/super.c:530 vfs_get_super+0x6d/0x2d0 fs/super.c:1186 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2874 [inline] do_mount+0x1306/0x1b40 fs/namespace.c:3199 __do_sys_mount fs/namespace.c:3409 [inline] __se_sys_mount fs/namespace.c:3386 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3386 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 23: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 The buggy address belongs to the object at ffff88809fd7e000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1984 bytes inside of 4096-byte region [ffff88809fd7e000, ffff88809fd7f000) The buggy address belongs to the page: page:ffffea00027f5f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00027f5f80 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea000247aa88 ffffea000242ef08 ffff8880aa002000 raw: 0000000000000000 ffff88809fd7e000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809fd7e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809fd7e700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809fd7e780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809fd7e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809fd7e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches

3 3

[PATCH 1/2] batctl: Only remove batadv interface on hardif reduction
by Sven Eckelmann 13 Jun '20

13 Jun '20

A deletion of a hardif from a batadv meshif will also get a success reply from the kernel when the hardif was never part of the batadv meshif. If the batadv meshif had no attached hardifs before the removal was started, then users are then not expecting that the batadv meshif is removed at all. Since the delete operation is not an atomic compare-and-swap operation, just check first the number of attached interfaces and only start the removal of the batadv meshif when the number attached hardifs was reduced. Fixes: 25022e0b154d ("batctl: Use rtnl to add/remove interfaces") Reported-by: Matthias Schiffer <mschiffer(a)universe-factory.net> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- interface.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/interface.c b/interface.c index 1cd6ede..ac4d883 100644 --- a/interface.c +++ b/interface.c @@ -386,6 +386,7 @@ static int interface(struct state *state, int argc, char **argv) int ret; unsigned int ifindex; unsigned int ifmaster; + unsigned int pre_cnt; const char *long_op; unsigned int cnt; int rest_argc; @@ -502,6 +503,8 @@ static int interface(struct state *state, int argc, char **argv) goto err; } + pre_cnt = count_interfaces(state->mesh_iface); + for (i = 1; i < rest_argc; i++) { ifindex = if_nametoindex(rest_argv[i]); @@ -531,7 +534,7 @@ static int interface(struct state *state, int argc, char **argv) /* check if there is no interface left and then destroy mesh_iface */ if (!manual_mode && rest_argv[0][0] == 'd') { cnt = count_interfaces(state->mesh_iface); - if (cnt == 0) + if (cnt == 0 && pre_cnt > 0) destroy_interface(state->mesh_iface); } -- 2.20.1

1 1

[PATCH AUTOSEL 4.19 025/106] batman-adv: Revert "disable ethtool link speed detection when auto negotiation off"
by Sasha Levin 08 Jun '20

08 Jun '20

From: Sven Eckelmann <sven(a)narfation.org> [ Upstream commit 9ad346c90509ebd983f60da7d082f261ad329507 ] The commit 8c46fcd78308 ("batman-adv: disable ethtool link speed detection when auto negotiation off") disabled the usage of ethtool's link_ksetting when auto negotation was enabled due to invalid values when used with tun/tap virtual net_devices. According to the patch, automatic measurements should be used for these kind of interfaces. But there are major flaws with this argumentation: * automatic measurements are not implemented * auto negotiation has nothing to do with the validity of the retrieved values The first point has to be fixed by a longer patch series. The "validity" part of the second point must be addressed in the same patch series by dropping the usage of ethtool's link_ksetting (thus always doing automatic measurements over ethernet). Drop the patch again to have more default values for various net_device types/configurations. The user can still overwrite them using the batadv_hardif's BATADV_ATTR_THROUGHPUT_OVERRIDE. Reported-by: Matthias Schiffer <mschiffer(a)universe-factory.net> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Signed-off-by: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/batman-adv/bat_v_elp.c | 15 +-------------- 1 file changed, 1 insertion(+), 14 deletions(-) diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c index 5da183b2f4c9..af3da6cdfc79 100644 --- a/net/batman-adv/bat_v_elp.c +++ b/net/batman-adv/bat_v_elp.c @@ -132,20 +132,7 @@ static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) rtnl_lock(); ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings); rtnl_unlock(); - - /* Virtual interface drivers such as tun / tap interfaces, VLAN, etc - * tend to initialize the interface throughput with some value for the - * sake of having a throughput number to export via ethtool. This - * exported throughput leaves batman-adv to conclude the interface - * throughput is genuine (reflecting reality), thus no measurements - * are necessary. - * - * Based on the observation that those interface types also tend to set - * the link auto-negotiation to 'off', batman-adv shall check this - * setting to differentiate between genuine link throughput information - * and placeholders installed by virtual interfaces. - */ - if (ret == 0 && link_settings.base.autoneg == AUTONEG_ENABLE) { + if (ret == 0) { /* link characteristics might change over time */ if (link_settings.base.duplex == DUPLEX_FULL) hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; -- 2.25.1

1 0

[PATCH AUTOSEL 5.4 051/175] batman-adv: Revert "disable ethtool link speed detection when auto negotiation off"
by Sasha Levin 08 Jun '20

08 Jun '20

From: Sven Eckelmann <sven(a)narfation.org> [ Upstream commit 9ad346c90509ebd983f60da7d082f261ad329507 ] The commit 8c46fcd78308 ("batman-adv: disable ethtool link speed detection when auto negotiation off") disabled the usage of ethtool's link_ksetting when auto negotation was enabled due to invalid values when used with tun/tap virtual net_devices. According to the patch, automatic measurements should be used for these kind of interfaces. But there are major flaws with this argumentation: * automatic measurements are not implemented * auto negotiation has nothing to do with the validity of the retrieved values The first point has to be fixed by a longer patch series. The "validity" part of the second point must be addressed in the same patch series by dropping the usage of ethtool's link_ksetting (thus always doing automatic measurements over ethernet). Drop the patch again to have more default values for various net_device types/configurations. The user can still overwrite them using the batadv_hardif's BATADV_ATTR_THROUGHPUT_OVERRIDE. Reported-by: Matthias Schiffer <mschiffer(a)universe-factory.net> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Signed-off-by: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/batman-adv/bat_v_elp.c | 15 +-------------- 1 file changed, 1 insertion(+), 14 deletions(-) diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c index 2614a9caee00..a39af0eefad3 100644 --- a/net/batman-adv/bat_v_elp.c +++ b/net/batman-adv/bat_v_elp.c @@ -120,20 +120,7 @@ static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) rtnl_lock(); ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings); rtnl_unlock(); - - /* Virtual interface drivers such as tun / tap interfaces, VLAN, etc - * tend to initialize the interface throughput with some value for the - * sake of having a throughput number to export via ethtool. This - * exported throughput leaves batman-adv to conclude the interface - * throughput is genuine (reflecting reality), thus no measurements - * are necessary. - * - * Based on the observation that those interface types also tend to set - * the link auto-negotiation to 'off', batman-adv shall check this - * setting to differentiate between genuine link throughput information - * and placeholders installed by virtual interfaces. - */ - if (ret == 0 && link_settings.base.autoneg == AUTONEG_ENABLE) { + if (ret == 0) { /* link characteristics might change over time */ if (link_settings.base.duplex == DUPLEX_FULL) hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; -- 2.25.1

1 0

[PATCH AUTOSEL 5.7 071/274] batman-adv: Revert "disable ethtool link speed detection when auto negotiation off"
by Sasha Levin 08 Jun '20

08 Jun '20

From: Sven Eckelmann <sven(a)narfation.org> [ Upstream commit 9ad346c90509ebd983f60da7d082f261ad329507 ] The commit 8c46fcd78308 ("batman-adv: disable ethtool link speed detection when auto negotiation off") disabled the usage of ethtool's link_ksetting when auto negotation was enabled due to invalid values when used with tun/tap virtual net_devices. According to the patch, automatic measurements should be used for these kind of interfaces. But there are major flaws with this argumentation: * automatic measurements are not implemented * auto negotiation has nothing to do with the validity of the retrieved values The first point has to be fixed by a longer patch series. The "validity" part of the second point must be addressed in the same patch series by dropping the usage of ethtool's link_ksetting (thus always doing automatic measurements over ethernet). Drop the patch again to have more default values for various net_device types/configurations. The user can still overwrite them using the batadv_hardif's BATADV_ATTR_THROUGHPUT_OVERRIDE. Reported-by: Matthias Schiffer <mschiffer(a)universe-factory.net> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Signed-off-by: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/batman-adv/bat_v_elp.c | 15 +-------------- 1 file changed, 1 insertion(+), 14 deletions(-) diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c index 1e3172db7492..955e0b8960d6 100644 --- a/net/batman-adv/bat_v_elp.c +++ b/net/batman-adv/bat_v_elp.c @@ -127,20 +127,7 @@ static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) rtnl_lock(); ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings); rtnl_unlock(); - - /* Virtual interface drivers such as tun / tap interfaces, VLAN, etc - * tend to initialize the interface throughput with some value for the - * sake of having a throughput number to export via ethtool. This - * exported throughput leaves batman-adv to conclude the interface - * throughput is genuine (reflecting reality), thus no measurements - * are necessary. - * - * Based on the observation that those interface types also tend to set - * the link auto-negotiation to 'off', batman-adv shall check this - * setting to differentiate between genuine link throughput information - * and placeholders installed by virtual interfaces. - */ - if (ret == 0 && link_settings.base.autoneg == AUTONEG_ENABLE) { + if (ret == 0) { /* link characteristics might change over time */ if (link_settings.base.duplex == DUPLEX_FULL) hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; -- 2.25.1

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[PATCH v2] batctl: Add per interface hop penalty command
by Linus Lüssing 04 Jun '20

04 Jun '20

This patch extends the hop penalty setting to be configurable not only on a node scope but also on a per hard interface basis. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- README.rst | 7 ++++++- event.c | 4 ++++ hop_penalty.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ man/batctl.8 | 4 ++++ 4 files changed, 61 insertions(+), 1 deletion(-) diff --git a/README.rst b/README.rst index 128f539..4830347 100644 --- a/README.rst +++ b/README.rst @@ -562,8 +562,13 @@ Usage:: Example:: - $ batctl penalty + $ batctl hop_penalty 30 + $ batctl hardif eth0 hop_penalty + 0 + $ batctl hardif eth0 hop_penalty 50 + $ batctl hardif eth0 hop_penalty + 50 batctl isolation_mark diff --git a/event.c b/event.c index cebb803..3fbc6cc 100644 --- a/event.c +++ b/event.c @@ -317,6 +317,10 @@ static void event_parse_set_hardif(struct nlattr **attrs) printf("%s (%s): set hardif:\n", meshif_name, hardif_name); + if (attrs[BATADV_ATTR_HOP_PENALTY]) + printf("* hop_penalty %u\n", + nla_get_u8(attrs[BATADV_ATTR_HOP_PENALTY])); + if (attrs[BATADV_ATTR_ELP_INTERVAL]) printf("* elp_interval %u ms\n", nla_get_u32(attrs[BATADV_ATTR_ELP_INTERVAL])); diff --git a/hop_penalty.c b/hop_penalty.c index 1f8f1db..5f1aabc 100644 --- a/hop_penalty.c +++ b/hop_penalty.c @@ -70,6 +70,22 @@ static int get_hop_penalty(struct state *state) NULL, print_hop_penalty); } +static int get_attrs_hop_penalty_if(struct nl_msg *msg, void *arg) +{ + struct state *state = arg; + + nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, state->hif); + + return 0; +} + +static int get_hop_penalty_if(struct state *state) +{ + return sys_simple_nlquery(state, BATADV_CMD_GET_HARDIF, + get_attrs_hop_penalty_if, + print_hop_penalty); +} + static int set_attrs_hop_penalty(struct nl_msg *msg, void *arg) { struct state *state = arg; @@ -87,6 +103,24 @@ static int set_hop_penalty(struct state *state) set_attrs_hop_penalty, NULL); } +static int set_attrs_hop_penalty_if(struct nl_msg *msg, void *arg) +{ + struct state *state = arg; + struct settings_data *settings = state->cmd->arg; + struct hop_penalty_data *data = settings->data; + + nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, state->hif); + nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY, data->hop_penalty); + + return 0; +} + +static int set_hop_penalty_if(struct state *state) +{ + return sys_simple_nlquery(state, BATADV_CMD_SET_HARDIF, + set_attrs_hop_penalty_if, NULL); +} + static struct settings_data batctl_settings_hop_penalty = { .sysfs_name = "hop_penalty", .data = &hop_penalty, @@ -95,7 +129,20 @@ static struct settings_data batctl_settings_hop_penalty = { .netlink_set = set_hop_penalty, }; +static struct settings_data batctl_settings_hop_penalty_if = { + .sysfs_name = NULL, + .data = &hop_penalty, + .parse = parse_hop_penalty, + .netlink_get = get_hop_penalty_if, + .netlink_set = set_hop_penalty_if, +}; + COMMAND_NAMED(SUBCOMMAND_MIF, hop_penalty, "hp", handle_sys_setting, COMMAND_FLAG_MESH_IFACE | COMMAND_FLAG_NETLINK, &batctl_settings_hop_penalty, "[penalty] \tdisplay or modify hop_penalty setting"); + +COMMAND_NAMED(SUBCOMMAND_HIF, hop_penalty, "hp", handle_sys_setting, + COMMAND_FLAG_MESH_IFACE | COMMAND_FLAG_NETLINK, + &batctl_settings_hop_penalty_if, + "[penalty] \tdisplay or modify hop_penalty setting"); diff --git a/man/batctl.8 b/man/batctl.8 index 6e75cdd..d4d5fe5 100644 --- a/man/batctl.8 +++ b/man/batctl.8 @@ -109,6 +109,10 @@ disable fragmentation. If no parameter is given the current hop penalty setting is displayed. Otherwise the parameter is used to set the hop penalty. The penalty is can be 0-255 (255 sets originator message's TQ to zero when forwarded by this hop). .br +.IP "[\fBhardif <hardif>\fP] \fBhop_penalty\fP|\fBhp\fP [\fBpenalty\fP]" +If no parameter is given the current hop penalty setting of the hard interface is displayed. Otherwise the parameter is used to set the +hop penalty. The penalty can be 0-255 (255 sets originator message's TQ to zero when forwarded over this interface). +.br .IP "[\fBmeshif <netdev>\fP] \fBnetwork_coding\fP|\fBnc\fP [\fB0\fP|\fB1\fP]" If no parameter is given the current network coding mode setting is displayed. Otherwise the parameter is used to enable or disable network coding. -- 2.27.0.rc2

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B.A.T.M.A.N June 2020