diff options
Diffstat (limited to 'wlantest/process.c')
| -rw-r--r-- | wlantest/process.c | 135 |
1 files changed, 110 insertions, 25 deletions
diff --git a/wlantest/process.c b/wlantest/process.c index 3b80974..974529c 100644 --- a/wlantest/process.c +++ b/wlantest/process.c @@ -21,65 +21,143 @@ #include "wlantest.h" -static int rx_duplicate(struct wlantest *wt, const struct ieee80211_hdr *hdr, - size_t len) +static struct wlantest_sta * rx_get_sta(struct wlantest *wt, + const struct ieee80211_hdr *hdr, + size_t len, int *to_ap) { u16 fc; - int tid = 16; const u8 *sta_addr, *bssid; struct wlantest_bss *bss; - struct wlantest_sta *sta; - int to_ap; - le16 *seq_ctrl; + *to_ap = 0; if (hdr->addr1[0] & 0x01) - return 0; /* Ignore group addressed frames */ + return NULL; /* Ignore group addressed frames */ fc = le_to_host16(hdr->frame_control); - if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT) { + switch (WLAN_FC_GET_TYPE(fc)) { + case WLAN_FC_TYPE_MGMT: + if (len < 24) + return NULL; bssid = hdr->addr3; if (os_memcmp(bssid, hdr->addr2, ETH_ALEN) == 0) { sta_addr = hdr->addr1; - to_ap = 0; + *to_ap = 0; } else { if (os_memcmp(bssid, hdr->addr1, ETH_ALEN) != 0) - return 0; /* Unsupported STA-to-STA frame */ + return NULL; /* Unsupported STA-to-STA frame */ sta_addr = hdr->addr2; - to_ap = 1; + *to_ap = 1; } - } else { + break; + case WLAN_FC_TYPE_DATA: + if (len < 24) + return NULL; switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) { case 0: - return 0; /* IBSS not supported */ + return NULL; /* IBSS not supported */ case WLAN_FC_FROMDS: sta_addr = hdr->addr1; bssid = hdr->addr2; - to_ap = 0; + *to_ap = 0; break; case WLAN_FC_TODS: sta_addr = hdr->addr2; bssid = hdr->addr1; - to_ap = 1; + *to_ap = 1; break; case WLAN_FC_TODS | WLAN_FC_FROMDS: - return 0; /* WDS not supported */ + return NULL; /* WDS not supported */ default: - return 0; - } - - if ((WLAN_FC_GET_STYPE(fc) & 0x08) && len >= 26) { - const u8 *qos = ((const u8 *) hdr) + 24; - tid = qos[0] & 0x0f; + return NULL; } + break; + case WLAN_FC_TYPE_CTRL: + if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_PSPOLL && + len >= 16) { + sta_addr = hdr->addr2; + bssid = hdr->addr1; + *to_ap = 1; + } else + return NULL; + break; } bss = bss_find(wt, bssid); if (bss == NULL) return 0; - sta = sta_find(bss, sta_addr); + return sta_find(bss, sta_addr); +} + + +static void rx_update_ps(struct wlantest *wt, const struct ieee80211_hdr *hdr, + size_t len, struct wlantest_sta *sta, int to_ap) +{ + u16 fc, type, stype; + + if (sta == NULL) + return; + + fc = le_to_host16(hdr->frame_control); + type = WLAN_FC_GET_TYPE(fc); + stype = WLAN_FC_GET_STYPE(fc); + + if (!to_ap) { + if (sta->pwrmgt && !sta->pspoll) { + u16 seq_ctrl = le_to_host16(hdr->seq_ctrl); + wpa_printf(MSG_DEBUG, "AP " MACSTR " sent a frame " + "(%u:%u) to a sleeping STA " MACSTR + " (seq=%u)", + MAC2STR(sta->bss->bssid), + type, stype, MAC2STR(sta->addr), + WLAN_GET_SEQ_SEQ(seq_ctrl)); + } else + sta->pspoll = 0; + return; + } + + sta->pspoll = 0; + + if (type == WLAN_FC_TYPE_DATA || type == WLAN_FC_TYPE_MGMT || + (type == WLAN_FC_TYPE_CTRL && stype == WLAN_FC_STYPE_PSPOLL)) { + /* + * In theory, the PS state changes only at the end of the frame + * exchange that is ACKed by the AP. However, most cases are + * handled with this simpler implementation that does not + * maintain state through the frame exchange. + */ + if (sta->pwrmgt && !(fc & WLAN_FC_PWRMGT)) { + wpa_printf(MSG_DEBUG, "STA " MACSTR " woke up from " + "sleep", MAC2STR(sta->addr)); + sta->pwrmgt = 0; + } else if (!sta->pwrmgt && (fc & WLAN_FC_PWRMGT)) { + wpa_printf(MSG_DEBUG, "STA " MACSTR " went to sleep", + MAC2STR(sta->addr)); + sta->pwrmgt = 1; + } + } + + if (type == WLAN_FC_TYPE_CTRL && stype == WLAN_FC_STYPE_PSPOLL) + sta->pspoll = 1; +} + + +static int rx_duplicate(struct wlantest *wt, const struct ieee80211_hdr *hdr, + size_t len, struct wlantest_sta *sta, int to_ap) +{ + u16 fc; + int tid = 16; + le16 *seq_ctrl; + if (sta == NULL) return 0; + fc = le_to_host16(hdr->frame_control); + if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA && + (WLAN_FC_GET_STYPE(fc) & 0x08) && len >= 26) { + const u8 *qos = ((const u8 *) hdr) + 24; + tid = qos[0] & 0x0f; + } + if (to_ap) seq_ctrl = &sta->seq_ctrl_to_ap[tid]; else @@ -123,6 +201,8 @@ static void rx_frame(struct wlantest *wt, const u8 *data, size_t len) { const struct ieee80211_hdr *hdr; u16 fc; + struct wlantest_sta *sta; + int to_ap; wpa_hexdump(MSG_EXCESSIVE, "RX frame", data, len); if (len < 2) @@ -136,26 +216,31 @@ static void rx_frame(struct wlantest *wt, const u8 *data, size_t len) return; } + sta = rx_get_sta(wt, hdr, len, &to_ap); + switch (WLAN_FC_GET_TYPE(fc)) { case WLAN_FC_TYPE_MGMT: if (len < 24) break; - if (rx_duplicate(wt, hdr, len)) + if (rx_duplicate(wt, hdr, len, sta, to_ap)) break; + rx_update_ps(wt, hdr, len, sta, to_ap); rx_mgmt(wt, data, len); break; case WLAN_FC_TYPE_CTRL: if (len < 10) break; wt->rx_ctrl++; + rx_update_ps(wt, hdr, len, sta, to_ap); if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_ACK) rx_ack(wt, hdr); break; case WLAN_FC_TYPE_DATA: if (len < 24) break; - if (rx_duplicate(wt, hdr, len)) + if (rx_duplicate(wt, hdr, len, sta, to_ap)) break; + rx_update_ps(wt, hdr, len, sta, to_ap); rx_data(wt, data, len); break; default: |