driver_nl80211.c

最新的Host AP 新添加了许多pcmcia 的驱动

	return ret;
}


static int i802_init_sockets(struct i802_driver_data *drv, const u8 *bssid)
{
	struct ifreq ifr;
	struct sockaddr_ll addr;

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

	/* start listening for EAPOL on the default AP interface */
	add_ifidx(drv, if_nametoindex(drv->iface));

	if (hostapd_set_iface_flags(drv, drv->iface, 0))
		return -1;

	if (bssid) {
		os_strlcpy(ifr.ifr_name, drv->iface, IFNAMSIZ);
		memcpy(ifr.ifr_hwaddr.sa_data, bssid, ETH_ALEN);
		ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;

		if (ioctl(drv->ioctl_sock, SIOCSIFHWADDR, &ifr)) {
			perror("ioctl(SIOCSIFHWADDR)");
			return -1;
		}
	}

	/*
	 * initialise generic netlink and nl80211
	 */
	drv->nl_cb = nl_cb_alloc(NL_CB_DEFAULT);
	if (!drv->nl_cb) {
		printf("Failed to allocate netlink callbacks.\n");
		return -1;
	}

	drv->nl_handle = nl_handle_alloc_cb(drv->nl_cb);
	if (!drv->nl_handle) {
		printf("Failed to allocate netlink handle.\n");
		return -1;
	}

	if (genl_connect(drv->nl_handle)) {
		printf("Failed to connect to generic netlink.\n");
		return -1;
	}

#ifdef CONFIG_LIBNL20
	if (genl_ctrl_alloc_cache(drv->nl_handle, &drv->nl_cache) < 0) {
		printf("Failed to allocate generic netlink cache.\n");
		return -1;
	}
#else /* CONFIG_LIBNL20 */
	drv->nl_cache = genl_ctrl_alloc_cache(drv->nl_handle);
	if (!drv->nl_cache) {
		printf("Failed to allocate generic netlink cache.\n");
		return -1;
	}
#endif /* CONFIG_LIBNL20 */

	drv->nl80211 = genl_ctrl_search_by_name(drv->nl_cache, "nl80211");
	if (!drv->nl80211) {
		printf("nl80211 not found.\n");
		return -1;
	}

	/* Initialise a monitor interface */
	if (nl80211_create_monitor_interface(drv))
		return -1;

	if (nl80211_set_master_mode(drv, drv->iface))
		goto fail1;

	if (hostapd_set_iface_flags(drv, drv->iface, 1))
		goto fail1;

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

	drv->eapol_sock = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_PAE));
	if (drv->eapol_sock < 0) {
		perror("socket(PF_PACKET, SOCK_DGRAM, ETH_P_PAE)");
		goto fail1;
	}

	if (eloop_register_read_sock(drv->eapol_sock, handle_eapol, drv, NULL))
	{
		printf("Could not register read socket for eapol\n");
		return -1;
	}

	memset(&ifr, 0, sizeof(ifr));
	os_strlcpy(ifr.ifr_name, drv->iface, sizeof(ifr.ifr_name));
	if (ioctl(drv->ioctl_sock, SIOCGIFHWADDR, &ifr) != 0) {
		perror("ioctl(SIOCGIFHWADDR)");
		goto fail1;
	}

	if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
		printf("Invalid HW-addr family 0x%04x\n",
		       ifr.ifr_hwaddr.sa_family);
		goto fail1;
	}
	memcpy(drv->hapd->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);

	return 0;

fail1:
	nl80211_remove_iface(drv, drv->monitor_ifidx);
	return -1;
}


static int i802_get_inact_sec(void *priv, const u8 *addr)
{
	struct hostap_sta_driver_data data;
	int ret;

	data.inactive_msec = (unsigned long) -1;
	ret = i802_read_sta_data(priv, &data, addr);
	if (ret || data.inactive_msec == (unsigned long) -1)
		return -1;
	return data.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)
{
	wpa_printf(MSG_DEBUG, "Custom wireless event: '%s'", custom);

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


static void hostapd_wireless_event_wireless(struct i802_driver_data *drv,
					    char *data, int len)
{
	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);
		wpa_printf(MSG_DEBUG, "Wireless event: cmd=0x%x len=%d",
			   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 < (int) 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 >= (int) 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 = os_zalloc(buflen);
	if (range == NULL)
		return -1;

	memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(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 void *i802_init_bssid(struct hostapd_data *hapd, const u8 *bssid)
{
	struct i802_driver_data *drv;

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

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

	drv->num_if_indices = sizeof(drv->default_if_indices) / sizeof(int);
	drv->if_indices = drv->default_if_indices;
	drv->bridge = if_nametoindex(hapd->conf->bridge);

	if (i802_init_sockets(drv, bssid))
		goto failed;

	return drv;

failed:
	free(drv);
	return NULL;
}


static void *i802_init(struct hostapd_data *hapd)
{
	return i802_init_bssid(hapd, NULL);
}


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

	if (drv->last_freq_ht) {
		/* Clear HT flags from the driver */
		struct hostapd_freq_params freq;
		os_memset(&freq, 0, sizeof(freq));
		freq.freq = drv->last_freq;
		i802_set_freq2(priv, &freq);
	}

	i802_del_beacon(drv);

	/* remove monitor interface */
	nl80211_remove_iface(drv, drv->monitor_ifidx);

	(void) hostapd_set_iface_flags(drv, drv->iface, 0);

	if (drv->monitor_sock >= 0) {
		eloop_unregister_read_sock(drv->monitor_sock);
		close(drv->monitor_sock);
	}
	if (drv->ioctl_sock >= 0)
		close(drv->ioctl_sock);
	if (drv->eapol_sock >= 0) {
		eloop_unregister_read_sock(drv->eapol_sock);
		close(drv->eapol_sock);
	}

	genl_family_put(drv->nl80211);
	nl_cache_free(drv->nl_cache);
	nl_handle_destroy(drv->nl_handle);
	nl_cb_put(drv->nl_cb);

	if (drv->if_indices != drv->default_if_indices)
		free(drv->if_indices);

	free(drv);
}


const struct wpa_driver_ops wpa_driver_nl80211_ops = {
	.name = "nl80211",
	.init = i802_init,
	.init_bssid = i802_init_bssid,
	.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,
	.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,
	.send_mgmt_frame = i802_send_mgmt_frame,
	.sta_add2 = i802_sta_add2,
	.get_inact_sec = i802_get_inact_sec,
	.sta_clear_stats = i802_sta_clear_stats,
	.set_freq2 = i802_set_freq2,
	.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_regulatory_domain = i802_set_regulatory_domain,
	.set_beacon = i802_set_beacon,
	.set_internal_bridge = i802_set_i