--- /dev/null
+/*
+ * wlantest frame injection
+ * Copyright (c) 2010-2015, 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 "common/defs.h"
+#include "common/ieee802_11_defs.h"
+#include "crypto/aes_wrap.h"
+#include "wlantest.h"
+
+
+static int inject_frame(int s, const void *data, size_t len)
+{
+#define IEEE80211_RADIOTAP_F_FRAG 0x08
+ unsigned char rtap_hdr[] = {
+ 0x00, 0x00, /* radiotap version */
+ 0x0e, 0x00, /* radiotap length */
+ 0x02, 0xc0, 0x00, 0x00, /* bmap: flags, tx and rx flags */
+ IEEE80211_RADIOTAP_F_FRAG, /* F_FRAG (fragment if required) */
+ 0x00, /* padding */
+ 0x00, 0x00, /* RX and TX flags to indicate that */
+ 0x00, 0x00, /* this is the injected frame directly */
+ };
+ struct iovec iov[2] = {
+ {
+ .iov_base = &rtap_hdr,
+ .iov_len = sizeof(rtap_hdr),
+ },
+ {
+ .iov_base = (void *) data,
+ .iov_len = len,
+ }
+ };
+ struct msghdr msg = {
+ .msg_name = NULL,
+ .msg_namelen = 0,
+ .msg_iov = iov,
+ .msg_iovlen = 2,
+ .msg_control = NULL,
+ .msg_controllen = 0,
+ .msg_flags = 0,
+ };
+ int ret;
+
+ ret = sendmsg(s, &msg, 0);
+ if (ret < 0)
+ wpa_printf(MSG_ERROR, "sendmsg: %s", strerror(errno));
+ return ret;
+}
+
+
+static int is_robust_mgmt(u8 *frame, size_t len)
+{
+ struct ieee80211_mgmt *mgmt;
+ u16 fc, stype;
+ if (len < 24)
+ return 0;
+ mgmt = (struct ieee80211_mgmt *) frame;
+ fc = le_to_host16(mgmt->frame_control);
+ if (WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_MGMT)
+ return 0;
+ stype = WLAN_FC_GET_STYPE(fc);
+ if (stype == WLAN_FC_STYPE_DEAUTH || stype == WLAN_FC_STYPE_DISASSOC)
+ return 1;
+ if (stype == WLAN_FC_STYPE_ACTION) {
+ if (len < 25)
+ return 0;
+ if (mgmt->u.action.category != WLAN_ACTION_PUBLIC)
+ return 1;
+ }
+ return 0;
+}
+
+
+static int wlantest_inject_bip(struct wlantest *wt, struct wlantest_bss *bss,
+ u8 *frame, size_t len, int incorrect_key)
+{
+ u8 *prot;
+ u8 dummy[32];
+ int ret;
+ size_t plen;
+
+ if (!bss->igtk_len[bss->igtk_idx])
+ return -1;
+
+ os_memset(dummy, 0x11, sizeof(dummy));
+ inc_byte_array(bss->ipn[bss->igtk_idx], 6);
+
+ prot = bip_protect(incorrect_key ? dummy : bss->igtk[bss->igtk_idx],
+ bss->igtk_len[bss->igtk_idx],
+ frame, len, bss->ipn[bss->igtk_idx],
+ bss->igtk_idx, &plen);
+ if (prot == NULL)
+ return -1;
+
+
+ ret = inject_frame(wt->monitor_sock, prot, plen);
+ os_free(prot);
+
+ return (ret < 0) ? -1 : 0;
+}
+
+
+static int wlantest_inject_prot_bc(struct wlantest *wt,
+ struct wlantest_bss *bss,
+ u8 *frame, size_t len, int incorrect_key)
+{
+ u8 *crypt;
+ size_t crypt_len;
+ int ret;
+ u8 dummy[64];
+ u8 *pn;
+ struct ieee80211_hdr *hdr;
+ u16 fc;
+ int hdrlen;
+
+ hdr = (struct ieee80211_hdr *) frame;
+ hdrlen = 24;
+ fc = le_to_host16(hdr->frame_control);
+
+ if (!bss->gtk_len[bss->gtk_idx])
+ return -1;
+
+ if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
+ (WLAN_FC_TODS | WLAN_FC_FROMDS))
+ hdrlen += ETH_ALEN;
+ pn = bss->rsc[bss->gtk_idx];
+ inc_byte_array(pn, 6);
+
+ os_memset(dummy, 0x11, sizeof(dummy));
+ if (bss->group_cipher == WPA_CIPHER_TKIP)
+ crypt = tkip_encrypt(incorrect_key ? dummy :
+ bss->gtk[bss->gtk_idx],
+ frame, len, hdrlen, NULL, pn,
+ bss->gtk_idx, &crypt_len);
+ else
+ crypt = ccmp_encrypt(incorrect_key ? dummy :
+ bss->gtk[bss->gtk_idx],
+ frame, len, hdrlen, NULL, pn,
+ bss->gtk_idx, &crypt_len);
+
+ if (crypt == NULL)
+ return -1;
+
+ ret = inject_frame(wt->monitor_sock, crypt, crypt_len);
+ os_free(crypt);
+
+ return (ret < 0) ? -1 : 0;
+}
+
+
+static int wlantest_inject_prot(struct wlantest *wt, struct wlantest_bss *bss,
+ struct wlantest_sta *sta, u8 *frame,
+ size_t len, int incorrect_key)
+{
+ u8 *crypt;
+ size_t crypt_len;
+ int ret;
+ u8 dummy[64];
+ u8 *pn;
+ struct ieee80211_hdr *hdr;
+ u16 fc;
+ int tid = 0;
+ u8 *qos = NULL;
+ int hdrlen;
+ struct wlantest_tdls *tdls = NULL;
+ const u8 *tk = NULL;
+
+ hdr = (struct ieee80211_hdr *) frame;
+ hdrlen = 24;
+ fc = le_to_host16(hdr->frame_control);
+
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
+ (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == 0) {
+ struct wlantest_sta *sta2;
+ bss = bss_get(wt, hdr->addr3);
+ if (bss == NULL) {
+ wpa_printf(MSG_DEBUG, "No BSS found for TDLS "
+ "injection");
+ return -1;
+ }
+ sta = sta_find(bss, hdr->addr2);
+ sta2 = sta_find(bss, hdr->addr1);
+ if (sta == NULL || sta2 == NULL) {
+ wpa_printf(MSG_DEBUG, "No stations found for TDLS "
+ "injection");
+ return -1;
+ }
+ dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list)
+ {
+ if ((tdls->init == sta && tdls->resp == sta2) ||
+ (tdls->init == sta2 && tdls->resp == sta)) {
+ if (!tdls->link_up)
+ wpa_printf(MSG_DEBUG, "TDLS: Link not "
+ "up, but injecting Data "
+ "frame on direct link");
+ tk = tdls->tpk.tk;
+ break;
+ }
+ }
+ }
+
+ if (tk == NULL && sta == NULL) {
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
+ return wlantest_inject_bip(wt, bss, frame, len,
+ incorrect_key);
+ return wlantest_inject_prot_bc(wt, bss, frame, len,
+ incorrect_key);
+ }
+
+ if (tk == NULL && !sta->ptk_set) {
+ wpa_printf(MSG_DEBUG, "No key known for injection");
+ return -1;
+ }
+
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
+ tid = 16;
+ else if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA) {
+ if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
+ (WLAN_FC_TODS | WLAN_FC_FROMDS))
+ hdrlen += ETH_ALEN;
+ if (WLAN_FC_GET_STYPE(fc) & 0x08) {
+ qos = frame + hdrlen;
+ hdrlen += 2;
+ tid = qos[0] & 0x0f;
+ }
+ }
+ if (tk) {
+ if (os_memcmp(hdr->addr2, tdls->init->addr, ETH_ALEN) == 0)
+ pn = tdls->rsc_init[tid];
+ else
+ pn = tdls->rsc_resp[tid];
+ } else if (os_memcmp(hdr->addr2, bss->bssid, ETH_ALEN) == 0)
+ pn = sta->rsc_fromds[tid];
+ else
+ pn = sta->rsc_tods[tid];
+ inc_byte_array(pn, 6);
+
+ os_memset(dummy, 0x11, sizeof(dummy));
+ if (tk)
+ crypt = ccmp_encrypt(incorrect_key ? dummy : tk,
+ frame, len, hdrlen, qos, pn, 0,
+ &crypt_len);
+ else if (sta->pairwise_cipher == WPA_CIPHER_TKIP)
+ crypt = tkip_encrypt(incorrect_key ? dummy : sta->ptk.tk,
+ frame, len, hdrlen, qos, pn, 0,
+ &crypt_len);
+ else
+ crypt = ccmp_encrypt(incorrect_key ? dummy : sta->ptk.tk,
+ frame, len, hdrlen, qos, pn, 0,
+ &crypt_len);
+
+ if (crypt == NULL) {
+ wpa_printf(MSG_DEBUG, "Frame encryption failed");
+ return -1;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "Inject frame (encrypted)", crypt, crypt_len);
+ ret = inject_frame(wt->monitor_sock, crypt, crypt_len);
+ os_free(crypt);
+ wpa_printf(MSG_DEBUG, "inject_frame for protected frame: %d", ret);
+
+ return (ret < 0) ? -1 : 0;
+}
+
+
+int wlantest_inject(struct wlantest *wt, struct wlantest_bss *bss,
+ struct wlantest_sta *sta, u8 *frame, size_t len,
+ enum wlantest_inject_protection prot)
+{
+ int ret;
+ struct ieee80211_hdr *hdr;
+ u16 fc;
+ int protectable, protect = 0;
+
+ wpa_hexdump(MSG_DEBUG, "Inject frame", frame, len);
+ if (wt->monitor_sock < 0) {
+ wpa_printf(MSG_INFO, "Cannot inject frames when monitor "
+ "interface is not in use");
+ return -1;
+ }
+
+ if (prot != WLANTEST_INJECT_UNPROTECTED && bss == NULL) {
+ wpa_printf(MSG_INFO, "No BSS information to inject "
+ "protected frames");
+ return -1;
+ }
+
+ hdr = (struct ieee80211_hdr *) frame;
+ fc = le_to_host16(hdr->frame_control);
+ protectable = WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA ||
+ is_robust_mgmt(frame, len);
+
+ if ((prot == WLANTEST_INJECT_PROTECTED ||
+ prot == WLANTEST_INJECT_INCORRECT_KEY) && bss) {
+ if (!sta &&
+ ((WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
+ !bss->igtk_len[bss->igtk_idx]) ||
+ (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
+ !bss->gtk_len[bss->gtk_idx]))) {
+ wpa_printf(MSG_INFO, "No GTK/IGTK known for "
+ MACSTR " to protect the injected "
+ "frame", MAC2STR(bss->bssid));
+ return -1;
+ }
+ if (sta && !sta->ptk_set) {
+ wpa_printf(MSG_INFO, "No PTK known for the STA " MACSTR
+ " to encrypt the injected frame",
+ MAC2STR(sta->addr));
+ return -1;
+ }
+ protect = 1;
+ } else if (protectable && prot != WLANTEST_INJECT_UNPROTECTED && bss) {
+ if (sta && sta->ptk_set)
+ protect = 1;
+ else if (!sta) {
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
+ bss->gtk_len[bss->gtk_idx])
+ protect = 1;
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
+ bss->igtk_len[bss->igtk_idx])
+ protect = 1;
+ }
+ }
+
+ if (protect && bss)
+ return wlantest_inject_prot(
+ wt, bss, sta, frame, len,
+ prot == WLANTEST_INJECT_INCORRECT_KEY);
+
+ ret = inject_frame(wt->monitor_sock, frame, len);
+ wpa_printf(MSG_DEBUG, "inject_frame for unprotected frame: %d", ret);
+ return (ret < 0) ? -1 : 0;
+}
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