driver_devicescape.c

hostapd源代码

			break;
		}
	}
	if (hapd == NULL) {
		hapd = iface->bss[0];

		if (bssid[0] != 0xff || bssid[1] != 0xff ||
		    bssid[2] != 0xff || bssid[3] != 0xff ||
		    bssid[4] != 0xff || bssid[5] != 0xff) {
			/* Unknown BSSID - drop frame if this is not from
			 * passive scanning or a beacon
			 * (at least ProbeReq frames to other APs may be
			 * allowed through RX filtering in the wlan hw/driver)
			 */
			if (msg_type != ieee80211_msg_passive_scan &&
			    (type != WLAN_FC_TYPE_MGMT ||
			     stype != WLAN_FC_STYPE_BEACON))
				return;
		} else
			broadcast_bssid = 1;
	}

	switch (msg_type) {
	case ieee80211_msg_normal:
	case ieee80211_msg_passive_scan:
		/* continue processing */
		break;
	case ieee80211_msg_tx_callback_ack:
		handle_tx_callback(hapd, buf, data_len, 1);
		return;
	case ieee80211_msg_tx_callback_fail:
		handle_tx_callback(hapd, buf, data_len, 0);
		return;
	case ieee80211_msg_wep_frame_unknown_key:
		/* TODO: ieee802_11_rx_unknown_key(hapd, buf, data_len); */
		return;
	case ieee80211_msg_michael_mic_failure:
		hostapd_michael_mic_failure(hapd, buf, data_len);
		return;
	case ieee80211_msg_monitor:
		/* drop monitor frames silently */
		return;
	case ieee80211_msg_sta_not_assoc:
		/* TODO: ieee802_11_rx_sta_not_assoc(hapd, buf, data_len); */
		return;
	default:
		printf("handle_frame: unknown msg_type %d\n", msg_type);
		return;
	}

	switch (type) {
	case WLAN_FC_TYPE_MGMT:
		HOSTAPD_DEBUG((stype == WLAN_FC_STYPE_BEACON ||
			       stype == WLAN_FC_STYPE_PROBE_REQ) ?
			      HOSTAPD_DEBUG_EXCESSIVE : HOSTAPD_DEBUG_VERBOSE,
			      "MGMT\n");
		if (broadcast_bssid) {
			for (i = 0; i < iface->num_bss; i++)
				ieee802_11_mgmt(iface->bss[i], buf, data_len,
						stype /*, fi */);
		} else
			ieee802_11_mgmt(hapd, buf, data_len, stype /*, fi */);
		break;
	case WLAN_FC_TYPE_CTRL:
		/* TODO: send deauth/disassoc if not associated STA sends
		 * PS-Poll */
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "CTRL\n");
		break;
	case WLAN_FC_TYPE_DATA:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "DATA\n");
		handle_data(hapd, buf, data_len, stype, fi);
		break;
	default:
		printf("unknown frame type %d\n", type);
		break;
	}
}


static void handle_read(int sock, void *eloop_ctx, void *sock_ctx)
{
	struct hostapd_iface *iface = eloop_ctx;
	int len;
	unsigned char buf[3000];
	struct ieee80211_frame_info *fi;
	HAPD_DECL;

	len = recv(sock, buf, sizeof(buf), 0);
	if (len < 0) {
		perror("recv");
		return;
	}
	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MSGDUMPS,
		      "Received %d bytes management frame\n", len);
	if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MSGDUMPS)) {
		int i;
		printf("  dump:");
		for (i = 0; i < len; i++)
			printf(" %02x", buf[i]);
		printf("\n");
        }

	if (len < sizeof(struct ieee80211_frame_info)) {
		printf("handle_read: too short (%d)\n", len);
		return;
	}

	fi = (struct ieee80211_frame_info *) buf;

	if (ntohl(fi->version) != IEEE80211_FI_VERSION) {
		printf("Invalid frame info version!\n");
		dump_frame_info(fi, len);
		return;
	}

	handle_frame(iface,
		     buf + sizeof(struct ieee80211_frame_info),
		     len - sizeof(struct ieee80211_frame_info),
		     fi);
}


static int i802_init_sockets(struct i802_driver_data *drv)
{
	struct hostapd_data *hapd = drv->hapd;
	struct hostapd_iface *iface = hapd->iface;
	struct ifreq ifr;
	struct sockaddr_ll addr;
	u8 *ifname;

	drv->sock = drv->ioctl_sock = -1;
	ifname = drv->iface;

	drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
	if (drv->ioctl_sock < 0) {
		perror("socket[PF_INET,SOCK_DGRAM]");
		return -1;
	}

        memset(&ifr, 0, sizeof(ifr));
        snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%sap", ifname);
        if (ioctl(drv->ioctl_sock, SIOCGIFINDEX, &ifr) != 0) {
		perror("ioctl(SIOCGIFINDEX)");
		return -1;
        }

	if (hostapd_set_iface_flags(drv, 1))
		return -1;

	memset(&addr, 0, sizeof(addr));
	addr.sll_family = AF_PACKET;
	addr.sll_ifindex = ifr.ifr_ifindex;
	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		      "Opening raw packet socket for ifindex %d\n",
		      addr.sll_ifindex);

	drv->sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
	if (drv->sock < 0) {
		perror("socket[PF_PACKET,SOCK_RAW]");
		return -1;
	}

	if (bind(drv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		perror(__FILE__ ":bind");
		return -1;
	}

	if (eloop_register_read_sock(drv->sock, handle_read, iface, NULL)) {
		printf("Could not register read socket\n");
		return -1;
	}

        memset(&ifr, 0, sizeof(ifr));
        snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", ifname);
        if (ioctl(drv->sock, SIOCGIFHWADDR, &ifr) != 0) {
		perror("ioctl(SIOCGIFHWADDR)");
		return -1;
        }

	if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
		printf("Invalid HW-addr family 0x%04x\n",
		       ifr.ifr_hwaddr.sa_family);
		return -1;
	}
	memcpy(drv->hapd->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);

	return 0;
}


static int i802_get_inact_sec(void *priv, const u8 *addr)
{
	struct i802_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_GET_INFO_STA;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param))) {
		return -1;
	}

	return param.u.get_info_sta.inactive_msec / 1000;
}


static int i802_sta_clear_stats(void *priv, const u8 *addr)
{
#if 0
	/* TODO */
#endif
	return 0;
}


static void
hostapd_wireless_event_wireless_custom(struct i802_driver_data *drv,
				       char *custom)
{
	struct hostapd_data *hapd = drv->hapd;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Custom wireless event: '%s'\n",
		      custom);

	if (strncmp(custom, "MLME-MICHAELMICFAILURE.indication", 33) == 0) {
		char *pos;
		u8 addr[ETH_ALEN];
		pos = strstr(custom, "addr=");
		if (pos == NULL) {
			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
				      "MLME-MICHAELMICFAILURE.indication "
				      "without sender address ignored\n");
			return;
		}
		pos += 5;
		if (hwaddr_aton(pos, addr) == 0) {
			ieee80211_michael_mic_failure(drv->hapd, addr, 1);
		} else {
			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
				      "MLME-MICHAELMICFAILURE.indication "
				      "with invalid MAC address");
		}
	}
}


static void hostapd_wireless_event_wireless(struct i802_driver_data *drv,
					    char *data, int len)
{
	struct hostapd_data *hapd = drv->hapd;
	struct iw_event iwe_buf, *iwe = &iwe_buf;
	char *pos, *end, *custom, *buf;

	pos = data;
	end = data + len;

	while (pos + IW_EV_LCP_LEN <= end) {
		/* Event data may be unaligned, so make a local, aligned copy
		 * before processing. */
		memcpy(&iwe_buf, pos, IW_EV_LCP_LEN);
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_VERBOSE, "Wireless event: "
			      "cmd=0x%x len=%d\n", iwe->cmd, iwe->len);
		if (iwe->len <= IW_EV_LCP_LEN)
			return;

		custom = pos + IW_EV_POINT_LEN;
		if (drv->we_version > 18 &&
		    (iwe->cmd == IWEVMICHAELMICFAILURE ||
		     iwe->cmd == IWEVCUSTOM)) {
			/* WE-19 removed the pointer from struct iw_point */
			char *dpos = (char *) &iwe_buf.u.data.length;
			int dlen = dpos - (char *) &iwe_buf;
			memcpy(dpos, pos + IW_EV_LCP_LEN,
			       sizeof(struct iw_event) - dlen);
		} else {
			memcpy(&iwe_buf, pos, sizeof(struct iw_event));
			custom += IW_EV_POINT_OFF;
		}

		switch (iwe->cmd) {
		case IWEVCUSTOM:
			if (custom + iwe->u.data.length > end)
				return;
			buf = malloc(iwe->u.data.length + 1);
			if (buf == NULL)
				return;
			memcpy(buf, custom, iwe->u.data.length);
			buf[iwe->u.data.length] = '\0';
			hostapd_wireless_event_wireless_custom(drv, buf);
			free(buf);
			break;
		}

		pos += iwe->len;
	}
}


static void hostapd_wireless_event_rtm_newlink(struct i802_driver_data *drv,
					       struct nlmsghdr *h, int len)
{
	struct ifinfomsg *ifi;
	int attrlen, nlmsg_len, rta_len;
	struct rtattr * attr;

	if (len < sizeof(*ifi))
		return;

	ifi = NLMSG_DATA(h);

	/* TODO: use ifi->ifi_index to filter out wireless events from other
	 * interfaces */

	nlmsg_len = NLMSG_ALIGN(sizeof(struct ifinfomsg));

	attrlen = h->nlmsg_len - nlmsg_len;
	if (attrlen < 0)
		return;

	attr = (struct rtattr *) (((char *) ifi) + nlmsg_len);

	rta_len = RTA_ALIGN(sizeof(struct rtattr));
	while (RTA_OK(attr, attrlen)) {
		if (attr->rta_type == IFLA_WIRELESS) {
			hostapd_wireless_event_wireless(
				drv, ((char *) attr) + rta_len,
				attr->rta_len - rta_len);
		}
		attr = RTA_NEXT(attr, attrlen);
	}
}


static void hostapd_wireless_event_receive(int sock, void *eloop_ctx,
					   void *sock_ctx)
{
	char buf[256];
	int left;
	struct sockaddr_nl from;
	socklen_t fromlen;
	struct nlmsghdr *h;
	struct i802_driver_data *drv = eloop_ctx;

	fromlen = sizeof(from);
	left = recvfrom(sock, buf, sizeof(buf), MSG_DONTWAIT,
			(struct sockaddr *) &from, &fromlen);
	if (left < 0) {
		if (errno != EINTR && errno != EAGAIN)
			perror("recvfrom(netlink)");
		return;
	}

	h = (struct nlmsghdr *) buf;
	while (left >= sizeof(*h)) {
		int len, plen;

		len = h->nlmsg_len;
		plen = len - sizeof(*h);
		if (len > left || plen < 0) {
			printf("Malformed netlink message: "
			       "len=%d left=%d plen=%d\n",
			       len, left, plen);
			break;
		}

		switch (h->nlmsg_type) {
		case RTM_NEWLINK:
			hostapd_wireless_event_rtm_newlink(drv, h, plen);
			break;
		}

		len = NLMSG_ALIGN(len);
		left -= len;
		h = (struct nlmsghdr *) ((char *) h + len);
	}

	if (left > 0) {
		printf("%d extra bytes in the end of netlink message\n", left);
	}
}


static int hostap_get_we_version(struct i802_driver_data *drv)
{
	struct iw_range *range;
	struct iwreq iwr;
	int minlen;
	size_t buflen;

	drv->we_version = 0;

	/*
	 * Use larger buffer than struct iw_range in order to allow the
	 * structure to grow in the future.
	 */
	buflen = sizeof(struct iw_range) + 500;
	range = wpa_zalloc(buflen);
	if (range == NULL)
		return -1;

	memset(&iwr, 0, sizeof(iwr));
	strncpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
	iwr.u.data.pointer = (caddr_t) range;
	iwr.u.data.length = buflen;

	minlen = ((char *) &range->enc_capa) - (char *) range +
		sizeof(range->enc_capa);

	if (ioctl(drv->ioctl_sock, SIOCGIWRANGE, &iwr) < 0) {
		perror("ioctl[SIOCGIWRANGE]");
		free(range);
		return -1;
	} else if (iwr.u.data.length >= minlen &&
		   range->we_version_compiled >= 18) {
		wpa_printf(MSG_DEBUG, "SIOCGIWRANGE: WE(compiled)=%d "
			   "WE(source)=%d enc_capa=0x%x",
			   range->we_version_compiled,
			   range->we_version_source,
			   range->enc_capa);
		drv->we_version = range->we_version_compiled;
	}

	free(range);
	return 0;
}


static int i802_wireless_event_init(void *priv)
{
	struct i802_driver_data *drv = priv;
	int s;
	struct sockaddr_nl local;

	hostap_get_we_version(drv);

	drv->wext_sock = -1;

	s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
	if (s < 0) {
		perror("socket(PF_NETLINK,SOCK_RAW,NETLINK_ROUTE)");
		return -1;
	}

	memset(&local, 0, sizeof(local));
	local.nl_family = AF_NETLINK;
	local.nl_groups = RTMGRP_LINK;
	if (bind(s, (struct sockaddr *) &local, sizeof(local)) < 0) {
		perror("bind(netlink)");
		close(s);
		return -1;
	}

	eloop_register_read_sock(s, hostapd_wireless_event_receive, drv,
				 NULL);
	drv->wext_sock = s;

	return 0;
}


static void i802_wireless_event_deinit(void *priv)
{
	struct i802_driver_data *drv = priv;
	if (drv->wext_sock < 0)
		return;
	eloop_unregister_read_sock(drv->wext_sock);
	close(drv->wext_sock);
}


static int i802_sta_deauth(void *priv, const u8 *addr, int reason)
{
	struct i802_driver_data *drv = priv;
	struct ieee80211_mgmt mgmt;

	memset(&mgmt, 0, sizeof(mgmt));
	mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					  WLAN_FC_STYPE_DEAUTH);
	memcpy(mgmt.da, addr, ETH_ALEN);
	memcpy(mgmt.sa, drv->hapd->own_addr, ETH_ALEN);
	memcpy(mgmt.bssid, drv->hapd->own_addr, ETH_ALEN);
	mgmt.u.deauth.reason_code = host_to_le16(reason);
	return i802_send_mgmt_frame(drv, &mgmt, IEEE80211_HDRLEN +
				      sizeof(mgmt.u.deauth), 0);
}


static int i802_sta_disassoc(void *priv, const u8 *addr, int reason)
{
	struct i802_driver_data *drv = priv;
	struct ieee80211_mgmt mgmt;

	memset(&mgmt, 0, sizeof(mgmt));
	mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					  WLAN_FC_STYPE_DISASSOC);
	memcpy(mgmt.da, addr, ETH_ALEN);
	memcpy(mgmt.sa, drv->hapd->own_addr, ETH_ALEN);
	memcpy(mgmt.bssid, drv->hapd->own_addr, ETH_ALEN);
	mgmt.u.disassoc.reason_code = host_to_le16(reason);
	return  i802_send_mgmt_frame(drv, &mgmt, IEEE80211_HDRLEN +
				       sizeof(mgmt.u.disassoc), 0);
}


static int i802_init(struct hostapd_data *hapd)
{
	struct i802_driver_data *drv;

	drv = wpa_zalloc(sizeof(struct i802_driver_data));
	if (drv == NULL) {
		printf("Could not allocate memory for i802 driver data\n");
		return -1;
	}

	drv->ops = devicescape_driver_ops;
	drv->hapd = hapd;
	memcpy(drv->iface, hapd->conf->iface, sizeof(drv->iface));

	if (i802_init_sockets(drv))
		goto failed;

	hapd->driver = &drv->ops;

	/* Enable the radio by default. */
	(void) hostap_ioctl_prism2param(drv, PRISM2_PARAM_ADM_STATUS, 1);

	return 0;

failed:
	free(drv);
	return -1;
}


static void i802_deinit(void *priv)
{
	struct i802_driver_data *drv = priv;

	/* Disable the radio. */
	(void) hostap_ioctl_prism2param(drv, PRISM2_PARAM_ADM_STATUS, 0);

	drv->hapd->driver = NULL;

	(void) hostapd_set_iface_flags(drv, 0);

	if (drv->sock >= 0)
		close(drv->sock);
	if (drv->ioctl_sock >= 0)
		close(drv->ioctl_sock);

	free(drv);
}


static const struct driver_ops devicescape_driver_ops = {
	.name = "devicescape",
	.init = i802_init,
	.deinit = i802_deinit,
	.wireless_event_init = i802_wireless_event_init,
	.wireless_event_deinit = i802_wireless_event_deinit,
	.set_ieee8021x = i802_set_ieee8021x,
	.set_privacy = i802_set_privacy,
	.set_encryption = i802_set_encryption,
	.get_seqnum = i802_get_seqnum,
	.flush = i802_flush,
	.set_generic_elem = i802_set_generic_elem,
	.read_sta_data = i802_read_sta_data,
	.send_eapol = i802_send_eapol,
	.sta_set_flags = i802_sta_set_flags,
	.sta_deauth = i802_sta_deauth,
	.sta_disassoc = i802_sta_disassoc,
	.sta_remove = i802_sta_remove,
	.set_ssid = i802_set_ssid,
	.send_mgmt_frame = i802_send_mgmt_frame,
	.set_assoc_ap = i802_set_assoc_ap,
	.sta_add = i802_sta_add,
	.get_inact_sec = i802_get_inact_sec,
	.sta_clear_stats = i802_sta_clear_stats,
	.set_freq = i802_set_freq,
	.set_rts = i802_set_rts,
	.get_rts = i802_get_rts,
	.set_frag = i802_set_frag,
	.get_frag = i802_get_frag,
	.set_retry = i802_set_retry,
	.get_retry = i802_get_retry,
	.set_rate_sets = i802_set_rate_sets,
	.set_channel_flag = i802_set_channel_flag,
	.set_regulatory_domain = i802_set_regulatory_domain,
	.set_beacon = i802_set_beacon,
	.set_beacon_int = i802_set_beacon_int,
	.set_dtim_period = i802_set_dtim_period,
	.set_broadcast_ssid = i802_set_broadcast_ssid,
	.set_cts_protect = i802_set_cts_protect,
	.set_key_tx_rx_threshold = i802_set_key_tx_rx_threshold,
	.set_preamble = i802_set_preamble,
	.set_short_slot_time = i802_set_short_slot_time,
	.set_tx_queue_params = i802_set_tx_queue_params,
	.get_hw_feature_data = i802_get_hw_feature_data,
	.set_sta_vlan = i802_set_sta_vlan,
};


void devicescape_driver_register(void)
{
	driver_register(devicescape_driver_ops.name, &devicescape_driver_ops);
}