--- /dev/null
+/*
+ * Received frame processing
+ * Copyright (c) 2010, Jouni Malinen <j@w1.fi>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "utils/radiotap.h"
+#include "utils/radiotap_iter.h"
+#include "common/ieee802_11_defs.h"
+#include "common/qca-vendor.h"
+#include "wlantest.h"
+
+
+static struct wlantest_sta * rx_get_sta(struct wlantest *wt,
+ const struct ieee80211_hdr *hdr,
+ size_t len, int *to_ap)
+{
+ u16 fc;
+ const u8 *sta_addr, *bssid;
+ struct wlantest_bss *bss;
+
+ *to_ap = 0;
+ if (hdr->addr1[0] & 0x01)
+ return NULL; /* Ignore group addressed frames */
+
+ fc = le_to_host16(hdr->frame_control);
+ 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;
+ } else {
+ if (os_memcmp(bssid, hdr->addr1, ETH_ALEN) != 0)
+ return NULL; /* Unsupported STA-to-STA frame */
+ sta_addr = hdr->addr2;
+ *to_ap = 1;
+ }
+ break;
+ case WLAN_FC_TYPE_DATA:
+ if (len < 24)
+ return NULL;
+ switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
+ case 0:
+ return NULL; /* IBSS not supported */
+ case WLAN_FC_FROMDS:
+ sta_addr = hdr->addr1;
+ bssid = hdr->addr2;
+ *to_ap = 0;
+ break;
+ case WLAN_FC_TODS:
+ sta_addr = hdr->addr2;
+ bssid = hdr->addr1;
+ *to_ap = 1;
+ break;
+ case WLAN_FC_TODS | WLAN_FC_FROMDS:
+ return NULL; /* WDS not supported */
+ default:
+ 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;
+ default:
+ return NULL;
+ }
+
+ bss = bss_find(wt, bssid);
+ if (bss == NULL)
+ return NULL;
+ 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);
+ add_note(wt, 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)) {
+ add_note(wt, MSG_DEBUG, "STA " MACSTR " woke up from "
+ "sleep", MAC2STR(sta->addr));
+ sta->pwrmgt = 0;
+ } else if (!sta->pwrmgt && (fc & WLAN_FC_PWRMGT)) {
+ add_note(wt, 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
+ seq_ctrl = &sta->seq_ctrl_to_sta[tid];
+
+ if ((fc & WLAN_FC_RETRY) && hdr->seq_ctrl == *seq_ctrl) {
+ u16 s = le_to_host16(hdr->seq_ctrl);
+ add_note(wt, MSG_MSGDUMP, "Ignore duplicated frame (seq=%u "
+ "frag=%u A1=" MACSTR " A2=" MACSTR ")",
+ WLAN_GET_SEQ_SEQ(s), WLAN_GET_SEQ_FRAG(s),
+ MAC2STR(hdr->addr1), MAC2STR(hdr->addr2));
+ return 1;
+ }
+
+ *seq_ctrl = hdr->seq_ctrl;
+
+ return 0;
+}
+
+
+static void rx_ack(struct wlantest *wt, const struct ieee80211_hdr *hdr)
+{
+ struct ieee80211_hdr *last = (struct ieee80211_hdr *) wt->last_hdr;
+ u16 fc;
+
+ if (wt->last_len < 24 || (last->addr1[0] & 0x01) ||
+ os_memcmp(hdr->addr1, last->addr2, ETH_ALEN) != 0) {
+ add_note(wt, MSG_MSGDUMP, "Unknown Ack frame (previous frame "
+ "not seen)");
+ return;
+ }
+
+ /* Ack to the previous frame */
+ fc = le_to_host16(last->frame_control);
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
+ rx_mgmt_ack(wt, last);
+}
+
+
+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)
+ return;
+
+ hdr = (const struct ieee80211_hdr *) data;
+ fc = le_to_host16(hdr->frame_control);
+ if (fc & WLAN_FC_PVER) {
+ wpa_printf(MSG_DEBUG, "Drop RX frame with unexpected pver=%d",
+ fc & WLAN_FC_PVER);
+ 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, 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, sta, to_ap))
+ break;
+ rx_update_ps(wt, hdr, len, sta, to_ap);
+ rx_data(wt, data, len);
+ break;
+ default:
+ wpa_printf(MSG_DEBUG, "Drop RX frame with unexpected type %d",
+ WLAN_FC_GET_TYPE(fc));
+ break;
+ }
+
+ os_memcpy(wt->last_hdr, data, len > sizeof(wt->last_hdr) ?
+ sizeof(wt->last_hdr) : len);
+ wt->last_len = len;
+}
+
+
+static void tx_status(struct wlantest *wt, const u8 *data, size_t len, int ack)
+{
+ wpa_printf(MSG_DEBUG, "TX status: ack=%d", ack);
+ wpa_hexdump(MSG_EXCESSIVE, "TX status frame", data, len);
+}
+
+
+static int check_fcs(const u8 *frame, size_t frame_len, const u8 *fcs)
+{
+ if (WPA_GET_LE32(fcs) != crc32(frame, frame_len))
+ return -1;
+ return 0;
+}
+
+
+void wlantest_process(struct wlantest *wt, const u8 *data, size_t len)
+{
+ struct ieee80211_radiotap_iterator iter;
+ int ret;
+ int rxflags = 0, txflags = 0, failed = 0, fcs = 0;
+ const u8 *frame, *fcspos;
+ size_t frame_len;
+
+ wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);
+
+ if (ieee80211_radiotap_iterator_init(&iter, (void *) data, len, NULL)) {
+ add_note(wt, MSG_INFO, "Invalid radiotap frame");
+ return;
+ }
+
+ for (;;) {
+ ret = ieee80211_radiotap_iterator_next(&iter);
+ wpa_printf(MSG_EXCESSIVE, "radiotap iter: %d "
+ "this_arg_index=%d", ret, iter.this_arg_index);
+ if (ret == -ENOENT)
+ break;
+ if (ret) {
+ add_note(wt, MSG_INFO, "Invalid radiotap header: %d",
+ ret);
+ return;
+ }
+ switch (iter.this_arg_index) {
+ case IEEE80211_RADIOTAP_FLAGS:
+ if (*iter.this_arg & IEEE80211_RADIOTAP_F_FCS)
+ fcs = 1;
+ break;
+ case IEEE80211_RADIOTAP_RX_FLAGS:
+ rxflags = 1;
+ break;
+ case IEEE80211_RADIOTAP_TX_FLAGS:
+ txflags = 1;
+ failed = le_to_host16((*(u16 *) iter.this_arg)) &
+ IEEE80211_RADIOTAP_F_TX_FAIL;
+ break;
+ case IEEE80211_RADIOTAP_VENDOR_NAMESPACE:
+ if (WPA_GET_BE24(iter.this_arg) == OUI_QCA &&
+ iter.this_arg[3] == QCA_RADIOTAP_VID_WLANTEST) {
+ add_note(wt, MSG_DEBUG,
+ "Skip frame inserted by wlantest");
+ return;
+ }
+ }
+ }
+
+ frame = data + iter._max_length;
+ frame_len = len - iter._max_length;
+
+ if (fcs && frame_len >= 4) {
+ frame_len -= 4;
+ fcspos = frame + frame_len;
+ if (check_fcs(frame, frame_len, fcspos) < 0) {
+ add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
+ "invalid FCS");
+ wt->fcs_error++;
+ return;
+ }
+ }
+
+ if (rxflags && txflags)
+ return;
+ if (!txflags)
+ rx_frame(wt, frame, frame_len);
+ else {
+ add_note(wt, MSG_EXCESSIVE, "TX status - process as RX of "
+ "local frame");
+ tx_status(wt, frame, frame_len, !failed);
+ /* Process as RX frame to support local monitor interface */
+ rx_frame(wt, frame, frame_len);
+ }
+}
+
+
+void wlantest_process_prism(struct wlantest *wt, const u8 *data, size_t len)
+{
+ int fcs = 0;
+ const u8 *frame, *fcspos;
+ size_t frame_len;
+ u32 hdrlen;
+
+ wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);
+
+ if (len < 8)
+ return;
+ hdrlen = WPA_GET_LE32(data + 4);
+
+ if (len < hdrlen) {
+ wpa_printf(MSG_INFO, "Too short frame to include prism "
+ "header");
+ return;
+ }
+
+ frame = data + hdrlen;
+ frame_len = len - hdrlen;
+ fcs = 1;
+
+ if (fcs && frame_len >= 4) {
+ frame_len -= 4;
+ fcspos = frame + frame_len;
+ if (check_fcs(frame, frame_len, fcspos) < 0) {
+ add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
+ "invalid FCS");
+ wt->fcs_error++;
+ return;
+ }
+ }
+
+ rx_frame(wt, frame, frame_len);
+}
+
+
+void wlantest_process_80211(struct wlantest *wt, const u8 *data, size_t len)
+{
+ wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);
+
+ if (wt->assume_fcs && len >= 4) {
+ const u8 *fcspos;
+
+ len -= 4;
+ fcspos = data + len;
+ if (check_fcs(data, len, fcspos) < 0) {
+ add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
+ "invalid FCS");
+ wt->fcs_error++;
+ return;
+ }
+ }
+
+ rx_frame(wt, data, len);
+}
projects / mech_eap.git / blobdiff