diff options
Diffstat (limited to 'package/network/services/hostapd/patches/011-mesh-use-deterministic-channel-on-channel-switch.patch')
| -rw-r--r-- | package/network/services/hostapd/patches/011-mesh-use-deterministic-channel-on-channel-switch.patch | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/package/network/services/hostapd/patches/011-mesh-use-deterministic-channel-on-channel-switch.patch b/package/network/services/hostapd/patches/011-mesh-use-deterministic-channel-on-channel-switch.patch new file mode 100644 index 0000000000..03a1e339a9 --- /dev/null +++ b/package/network/services/hostapd/patches/011-mesh-use-deterministic-channel-on-channel-switch.patch @@ -0,0 +1,81 @@ +From fc8ea40f6130ac18d9c66797de2cf1d5af55d496 Mon Sep 17 00:00:00 2001 +From: Markus Theil <markus.theil@tu-ilmenau.de> +Date: Tue, 30 Jun 2020 14:19:07 +0200 +Subject: [PATCH 19/19] mesh: use deterministic channel on channel switch + +This patch uses a deterministic channel on DFS channel switch +in mesh networks. Otherwise, when switching to a usable but not +available channel, no CSA can be sent and a random channel is choosen +without notification of other nodes. It is then quite likely, that +the mesh network gets disconnected. + +Fix this by using a deterministic number, based on the sha256 hash +of the mesh ID, in order to use at least a different number in each +mesh network. + +Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de> +--- + src/ap/dfs.c | 20 +++++++++++++++++++- + src/drivers/driver_nl80211.c | 4 ++++ + 2 files changed, 23 insertions(+), 1 deletion(-) + +--- a/src/ap/dfs.c ++++ b/src/ap/dfs.c +@@ -17,6 +17,7 @@ + #include "ap_drv_ops.h" + #include "drivers/driver.h" + #include "dfs.h" ++#include "crypto/crypto.h" + + + static int dfs_get_used_n_chans(struct hostapd_iface *iface, int *seg1) +@@ -480,9 +481,14 @@ dfs_get_valid_channel(struct hostapd_ifa + int num_available_chandefs; + int chan_idx, chan_idx2; + int sec_chan_idx_80p80 = -1; ++ bool is_mesh = false; + int i; + u32 _rand; + ++#ifdef CONFIG_MESH ++ is_mesh = iface->mconf; ++#endif ++ + wpa_printf(MSG_DEBUG, "DFS: Selecting random channel"); + *secondary_channel = 0; + *oper_centr_freq_seg0_idx = 0; +@@ -502,8 +508,20 @@ dfs_get_valid_channel(struct hostapd_ifa + if (num_available_chandefs == 0) + return NULL; + +- if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0) ++ /* try to use deterministic channel in mesh, so that both sides ++ * have a chance to switch to the same channel */ ++ if (is_mesh) { ++#ifdef CONFIG_MESH ++ u64 hash[4]; ++ const u8 *meshid[1] = { &iface->mconf->meshid[0] }; ++ const size_t meshid_len = iface->mconf->meshid_len; ++ ++ sha256_vector(1, meshid, &meshid_len, (u8 *)&hash[0]); ++ _rand = hash[0] + hash[1] + hash[2] + hash[3]; ++#endif ++ } else if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0) + return NULL; ++ + chan_idx = _rand % num_available_chandefs; + dfs_find_channel(iface, &chan, chan_idx, skip_radar); + if (!chan) { +--- a/src/drivers/driver_nl80211.c ++++ b/src/drivers/driver_nl80211.c +@@ -9872,6 +9872,10 @@ static int nl80211_switch_channel(void * + if (ret) + goto error; + ++ if (drv->nlmode == NL80211_IFTYPE_MESH_POINT) { ++ nla_put_flag(msg, NL80211_ATTR_HANDLE_DFS); ++ } ++ + /* beacon_csa params */ + beacon_csa = nla_nest_start(msg, NL80211_ATTR_CSA_IES); + if (!beacon_csa) |