From 082ebb0c258d28af7452b19df9ef8b7553f37690 Mon Sep 17 00:00:00 2001 From: Thomas Pedersen Date: Thu, 11 Aug 2011 19:35:10 -0700 Subject: mac80211: fix mesh beacon format Correct ordering of IEs in the mesh beacon while removing unneeded IEs from mesh peering frames. Set privacy bit in capability info if security is enabled. Add utility functions to aid in construction of IEs and reduce code duplication. Signed-off-by: Thomas Pedersen Signed-off-by: John W. Linville --- net/mac80211/mesh.c | 223 ++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 164 insertions(+), 59 deletions(-) (limited to 'net/mac80211/mesh.c') diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c index 29e9980c8e6..1990869033e 100644 --- a/net/mac80211/mesh.c +++ b/net/mac80211/mesh.c @@ -204,36 +204,185 @@ int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr, return 0; } -void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) +int +mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; + u8 *pos, neighbors; + u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); + + if (skb_tailroom(skb) < 2 + meshconf_len) + return -ENOMEM; + + pos = skb_put(skb, 2 + meshconf_len); + *pos++ = WLAN_EID_MESH_CONFIG; + *pos++ = meshconf_len; + + /* Active path selection protocol ID */ + *pos++ = ifmsh->mesh_pp_id; + /* Active path selection metric ID */ + *pos++ = ifmsh->mesh_pm_id; + /* Congestion control mode identifier */ + *pos++ = ifmsh->mesh_cc_id; + /* Synchronization protocol identifier */ + *pos++ = ifmsh->mesh_sp_id; + /* Authentication Protocol identifier */ + *pos++ = ifmsh->mesh_auth_id; + /* Mesh Formation Info - number of neighbors */ + neighbors = atomic_read(&ifmsh->mshstats.estab_plinks); + /* Number of neighbor mesh STAs or 15 whichever is smaller */ + neighbors = (neighbors > 15) ? 15 : neighbors; + *pos++ = neighbors << 1; + /* Mesh capability */ + ifmsh->accepting_plinks = mesh_plink_availables(sdata); + *pos = MESHCONF_CAPAB_FORWARDING; + *pos++ |= ifmsh->accepting_plinks ? + MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; + *pos++ = 0x00; + + return 0; +} + +int +mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; + u8 *pos; + + if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) + return -ENOMEM; + + pos = skb_put(skb, 2 + ifmsh->mesh_id_len); + *pos++ = WLAN_EID_MESH_ID; + *pos++ = ifmsh->mesh_id_len; + if (ifmsh->mesh_id_len) + memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); + + return 0; +} + +int +mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; + u8 offset, len; + const u8 *data; + + if (!ifmsh->ie || !ifmsh->ie_len) + return 0; + + /* fast-forward to vendor IEs */ + offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); + + if (offset) { + len = ifmsh->ie_len - offset; + data = ifmsh->ie + offset; + if (skb_tailroom(skb) < len) + return -ENOMEM; + memcpy(skb_put(skb, len), data, len); + } + + return 0; +} + +int +mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; + u8 len = 0; + const u8 *data; + + if (!ifmsh->ie || !ifmsh->ie_len) + return 0; + + /* find RSN IE */ + data = ifmsh->ie; + while (data < ifmsh->ie + ifmsh->ie_len) { + if (*data == WLAN_EID_RSN) { + len = data[1] + 2; + break; + } + data++; + } + + if (len) { + if (skb_tailroom(skb) < len) + return -ENOMEM; + memcpy(skb_put(skb, len), data, len); + } + + return 0; +} + +int +mesh_add_srates_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; - u8 *pos; - int len, i, rate; - u8 neighbors; + int rate; + u8 i, rates, *pos; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; - len = sband->n_bitrates; - if (len > 8) - len = 8; - pos = skb_put(skb, len + 2); + rates = sband->n_bitrates; + if (rates > 8) + rates = 8; + + if (skb_tailroom(skb) < rates + 2) + return -ENOMEM; + + pos = skb_put(skb, rates + 2); *pos++ = WLAN_EID_SUPP_RATES; - *pos++ = len; - for (i = 0; i < len; i++) { + *pos++ = rates; + for (i = 0; i < rates; i++) { rate = sband->bitrates[i].bitrate; *pos++ = (u8) (rate / 5); } - if (sband->n_bitrates > len) { - pos = skb_put(skb, sband->n_bitrates - len + 2); + return 0; +} + +int +mesh_add_ext_srates_ie(struct sk_buff *skb, + struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_supported_band *sband; + int rate; + u8 i, exrates, *pos; + + sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; + exrates = sband->n_bitrates; + if (exrates > 8) + exrates -= 8; + else + exrates = 0; + + if (skb_tailroom(skb) < exrates + 2) + return -ENOMEM; + + if (exrates) { + pos = skb_put(skb, exrates + 2); *pos++ = WLAN_EID_EXT_SUPP_RATES; - *pos++ = sband->n_bitrates - len; - for (i = len; i < sband->n_bitrates; i++) { + *pos++ = exrates; + for (i = 8; i < sband->n_bitrates; i++) { rate = sband->bitrates[i].bitrate; *pos++ = (u8) (rate / 5); } } + return 0; +} + +int mesh_add_ds_params_ie(struct sk_buff *skb, + struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_supported_band *sband; + u8 *pos; + + if (skb_tailroom(skb) < 3) + return -ENOMEM; + sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; if (sband->band == IEEE80211_BAND_2GHZ) { pos = skb_put(skb, 2 + 1); *pos++ = WLAN_EID_DS_PARAMS; @@ -241,53 +390,9 @@ void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq); } - pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len); - *pos++ = WLAN_EID_MESH_ID; - *pos++ = sdata->u.mesh.mesh_id_len; - if (sdata->u.mesh.mesh_id_len) - memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len); - - pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie)); - *pos++ = WLAN_EID_MESH_CONFIG; - *pos++ = sizeof(struct ieee80211_meshconf_ie); - - /* Active path selection protocol ID */ - *pos++ = sdata->u.mesh.mesh_pp_id; - - /* Active path selection metric ID */ - *pos++ = sdata->u.mesh.mesh_pm_id; - - /* Congestion control mode identifier */ - *pos++ = sdata->u.mesh.mesh_cc_id; - - /* Synchronization protocol identifier */ - *pos++ = sdata->u.mesh.mesh_sp_id; - - /* Authentication Protocol identifier */ - *pos++ = sdata->u.mesh.mesh_auth_id; - - /* Mesh Formation Info - number of neighbors */ - neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks); - /* Number of neighbor mesh STAs or 15 whichever is smaller */ - neighbors = (neighbors > 15) ? 15 : neighbors; - *pos++ = neighbors << 1; - - /* Mesh capability */ - sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata); - *pos = MESHCONF_CAPAB_FORWARDING; - *pos++ |= sdata->u.mesh.accepting_plinks ? - MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; - *pos++ = 0x00; - - if (sdata->u.mesh.ie) { - int len = sdata->u.mesh.ie_len; - const u8 *data = sdata->u.mesh.ie; - if (skb_tailroom(skb) > len) - memcpy(skb_put(skb, len), data, len); - } + return 0; } - static void ieee80211_mesh_path_timer(unsigned long data) { struct ieee80211_sub_if_data *sdata = -- cgit v1.2.3-18-g5258