driver_nl80211.c

IEEE802.11 a/b/g 客户端应用程序源代码

/*
 * WPA Supplicant - driver interaction with Linux nl80211/cfg80211
 * Copyright (c) 2003-2008, Jouni Malinen <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"
#include <sys/ioctl.h>
#include <net/if_arp.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <linux/nl80211.h>

#include "wireless_copy.h"
#include "common.h"
#include "driver.h"
#include "eloop.h"
#include "ieee802_11_defs.h"

#ifndef IFF_LOWER_UP
#define IFF_LOWER_UP   0x10000         /* driver signals L1 up         */
#endif
#ifndef IFF_DORMANT
#define IFF_DORMANT    0x20000         /* driver signals dormant       */
#endif

#ifndef IF_OPER_DORMANT
#define IF_OPER_DORMANT 5
#endif
#ifndef IF_OPER_UP
#define IF_OPER_UP 6
#endif


struct wpa_driver_nl80211_data {
	void *ctx;
	int event_sock;
	int ioctl_sock;
	char ifname[IFNAMSIZ + 1];
	int ifindex;
	u8 *assoc_req_ies;
	size_t assoc_req_ies_len;
	u8 *assoc_resp_ies;
	size_t assoc_resp_ies_len;
	struct wpa_driver_capa capa;
	int has_capability;
	int we_version_compiled;

	/* for set_auth_alg fallback */
	int use_crypt;
	int auth_alg_fallback;

	int operstate;

	char mlmedev[IFNAMSIZ + 1];

	int scan_complete_events;

	struct nl_handle *nl_handle;
	struct nl_cache *nl_cache;
	struct nl_cb *nl_cb;
	struct genl_family *nl80211;
};


static void wpa_driver_nl80211_scan_timeout(void *eloop_ctx,
					    void *timeout_ctx);
static int wpa_driver_nl80211_set_mode(void *priv, int mode);
static int wpa_driver_nl80211_flush_pmkid(void *priv);
static int wpa_driver_nl80211_get_range(void *priv);

static int wpa_driver_nl80211_send_oper_ifla(
	struct wpa_driver_nl80211_data *drv,
	int linkmode, int operstate)
{
	struct {
		struct nlmsghdr hdr;
		struct ifinfomsg ifinfo;
		char opts[16];
	} req;
	struct rtattr *rta;
	static int nl_seq;
	ssize_t ret;

	os_memset(&req, 0, sizeof(req));

	req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.hdr.nlmsg_type = RTM_SETLINK;
	req.hdr.nlmsg_flags = NLM_F_REQUEST;
	req.hdr.nlmsg_seq = ++nl_seq;
	req.hdr.nlmsg_pid = 0;

	req.ifinfo.ifi_family = AF_UNSPEC;
	req.ifinfo.ifi_type = 0;
	req.ifinfo.ifi_index = drv->ifindex;
	req.ifinfo.ifi_flags = 0;
	req.ifinfo.ifi_change = 0;

	if (linkmode != -1) {
		rta = (struct rtattr *)
			((char *) &req + NLMSG_ALIGN(req.hdr.nlmsg_len));
		rta->rta_type = IFLA_LINKMODE;
		rta->rta_len = RTA_LENGTH(sizeof(char));
		*((char *) RTA_DATA(rta)) = linkmode;
		req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
			RTA_LENGTH(sizeof(char));
	}
	if (operstate != -1) {
		rta = (struct rtattr *)
			((char *) &req + NLMSG_ALIGN(req.hdr.nlmsg_len));
		rta->rta_type = IFLA_OPERSTATE;
		rta->rta_len = RTA_LENGTH(sizeof(char));
		*((char *) RTA_DATA(rta)) = operstate;
		req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
			RTA_LENGTH(sizeof(char));
	}

	wpa_printf(MSG_DEBUG, "WEXT: Operstate: linkmode=%d, operstate=%d",
		   linkmode, operstate);

	ret = send(drv->event_sock, &req, req.hdr.nlmsg_len, 0);
	if (ret < 0) {
		wpa_printf(MSG_DEBUG, "WEXT: Sending operstate IFLA failed: "
			   "%s (assume operstate is not supported)",
			   strerror(errno));
	}

	return ret < 0 ? -1 : 0;
}


static int wpa_driver_nl80211_set_auth_param(
	struct wpa_driver_nl80211_data *drv, int idx, u32 value)
{
	struct iwreq iwr;
	int ret = 0;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	iwr.u.param.flags = idx & IW_AUTH_INDEX;
	iwr.u.param.value = value;

	if (ioctl(drv->ioctl_sock, SIOCSIWAUTH, &iwr) < 0) {
		if (errno != EOPNOTSUPP) {
			wpa_printf(MSG_DEBUG, "WEXT: SIOCSIWAUTH(param %d "
				   "value 0x%x) failed: %s)",
				   idx, value, strerror(errno));
		}
		ret = errno == EOPNOTSUPP ? -2 : -1;
	}

	return ret;
}


static int wpa_driver_nl80211_get_bssid(void *priv, u8 *bssid)
{
	struct wpa_driver_nl80211_data *drv = priv;
	struct iwreq iwr;
	int ret = 0;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);

	if (ioctl(drv->ioctl_sock, SIOCGIWAP, &iwr) < 0) {
		perror("ioctl[SIOCGIWAP]");
		ret = -1;
	}
	os_memcpy(bssid, iwr.u.ap_addr.sa_data, ETH_ALEN);

	return ret;
}


static int wpa_driver_nl80211_set_bssid(void *priv, const u8 *bssid)
{
	struct wpa_driver_nl80211_data *drv = priv;
	struct iwreq iwr;
	int ret = 0;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	iwr.u.ap_addr.sa_family = ARPHRD_ETHER;
	if (bssid)
		os_memcpy(iwr.u.ap_addr.sa_data, bssid, ETH_ALEN);
	else
		os_memset(iwr.u.ap_addr.sa_data, 0, ETH_ALEN);

	if (ioctl(drv->ioctl_sock, SIOCSIWAP, &iwr) < 0) {
		perror("ioctl[SIOCSIWAP]");
		ret = -1;
	}

	return ret;
}


static int wpa_driver_nl80211_get_ssid(void *priv, u8 *ssid)
{
	struct wpa_driver_nl80211_data *drv = priv;
	struct iwreq iwr;
	int ret = 0;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	iwr.u.essid.pointer = (caddr_t) ssid;
	iwr.u.essid.length = 32;

	if (ioctl(drv->ioctl_sock, SIOCGIWESSID, &iwr) < 0) {
		perror("ioctl[SIOCGIWESSID]");
		ret = -1;
	} else {
		ret = iwr.u.essid.length;
		if (ret > 32)
			ret = 32;
		/* Some drivers include nul termination in the SSID, so let's
		 * remove it here before further processing. WE-21 changes this
		 * to explicitly require the length _not_ to include nul
		 * termination. */
		if (ret > 0 && ssid[ret - 1] == '\0' &&
		    drv->we_version_compiled < 21)
			ret--;
	}

	return ret;
}


static int wpa_driver_nl80211_set_ssid(void *priv, const u8 *ssid,
				       size_t ssid_len)
{
	struct wpa_driver_nl80211_data *drv = priv;
	struct iwreq iwr;
	int ret = 0;
	char buf[33];

	if (ssid_len > 32)
		return -1;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	/* flags: 1 = ESSID is active, 0 = not (promiscuous) */
	iwr.u.essid.flags = (ssid_len != 0);
	os_memset(buf, 0, sizeof(buf));
	os_memcpy(buf, ssid, ssid_len);
	iwr.u.essid.pointer = (caddr_t) buf;
	if (drv->we_version_compiled < 21) {
		/* For historic reasons, set SSID length to include one extra
		 * character, C string nul termination, even though SSID is
		 * really an octet string that should not be presented as a C
		 * string. Some Linux drivers decrement the length by one and
		 * can thus end up missing the last octet of the SSID if the
		 * length is not incremented here. WE-21 changes this to
		 * explicitly require the length _not_ to include nul
		 * termination. */
		if (ssid_len)
			ssid_len++;
	}
	iwr.u.essid.length = ssid_len;

	if (ioctl(drv->ioctl_sock, SIOCSIWESSID, &iwr) < 0) {
		perror("ioctl[SIOCSIWESSID]");
		ret = -1;
	}

	return ret;
}


static int wpa_driver_nl80211_set_freq(void *priv, int freq)
{
	struct wpa_driver_nl80211_data *drv = priv;
	struct iwreq iwr;
	int ret = 0;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	iwr.u.freq.m = freq * 100000;
	iwr.u.freq.e = 1;

	if (ioctl(drv->ioctl_sock, SIOCSIWFREQ, &iwr) < 0) {
		perror("ioctl[SIOCSIWFREQ]");
		ret = -1;
	}

	return ret;
}


static void
wpa_driver_nl80211_event_wireless_custom(void *ctx, char *custom)
{
	union wpa_event_data data;

	wpa_printf(MSG_MSGDUMP, "WEXT: Custom wireless event: '%s'",
		   custom);

	os_memset(&data, 0, sizeof(data));
	/* Host AP driver */
	if (os_strncmp(custom, "MLME-MICHAELMICFAILURE.indication", 33) == 0) {
		data.michael_mic_failure.unicast =
			os_strstr(custom, " unicast ") != NULL;
		/* TODO: parse parameters(?) */
		wpa_supplicant_event(ctx, EVENT_MICHAEL_MIC_FAILURE, &data);
	} else if (os_strncmp(custom, "ASSOCINFO(ReqIEs=", 17) == 0) {
		char *spos;
		int bytes;

		spos = custom + 17;

		bytes = strspn(spos, "0123456789abcdefABCDEF");
		if (!bytes || (bytes & 1))
			return;
		bytes /= 2;

		data.assoc_info.req_ies = os_malloc(bytes);
		if (data.assoc_info.req_ies == NULL)
			return;

		data.assoc_info.req_ies_len = bytes;
		hexstr2bin(spos, data.assoc_info.req_ies, bytes);

		spos += bytes * 2;

		data.assoc_info.resp_ies = NULL;
		data.assoc_info.resp_ies_len = 0;

		if (os_strncmp(spos, " RespIEs=", 9) == 0) {
			spos += 9;

			bytes = strspn(spos, "0123456789abcdefABCDEF");
			if (!bytes || (bytes & 1))
				goto done;
			bytes /= 2;

			data.assoc_info.resp_ies = os_malloc(bytes);
			if (data.assoc_info.resp_ies == NULL)
				goto done;

			data.assoc_info.resp_ies_len = bytes;
			hexstr2bin(spos, data.assoc_info.resp_ies, bytes);
		}

		wpa_supplicant_event(ctx, EVENT_ASSOCINFO, &data);

	done:
		os_free(data.assoc_info.resp_ies);
		os_free(data.assoc_info.req_ies);
#ifdef CONFIG_PEERKEY
	} else if (os_strncmp(custom, "STKSTART.request=", 17) == 0) {
		if (hwaddr_aton(custom + 17, data.stkstart.peer)) {
			wpa_printf(MSG_DEBUG, "WEXT: unrecognized "
				   "STKSTART.request '%s'", custom + 17);
			return;
		}
		wpa_supplicant_event(ctx, EVENT_STKSTART, &data);
#endif /* CONFIG_PEERKEY */
	}
}


static int wpa_driver_nl80211_event_wireless_michaelmicfailure(
	void *ctx, const char *ev, size_t len)
{
	const struct iw_michaelmicfailure *mic;
	union wpa_event_data data;

	if (len < sizeof(*mic))
		return -1;

	mic = (const struct iw_michaelmicfailure *) ev;

	wpa_printf(MSG_DEBUG, "Michael MIC failure wireless event: "
		   "flags=0x%x src_addr=" MACSTR, mic->flags,
		   MAC2STR(mic->src_addr.sa_data));

	os_memset(&data, 0, sizeof(data));
	data.michael_mic_failure.unicast = !(mic->flags & IW_MICFAILURE_GROUP);
	wpa_supplicant_event(ctx, EVENT_MICHAEL_MIC_FAILURE, &data);

	return 0;
}


static int wpa_driver_nl80211_event_wireless_pmkidcand(
	struct wpa_driver_nl80211_data *drv, const char *ev, size_t len)
{
	const struct iw_pmkid_cand *cand;
	union wpa_event_data data;
	const u8 *addr;

	if (len < sizeof(*cand))
		return -1;

	cand = (const struct iw_pmkid_cand *) ev;
	addr = (const u8 *) cand->bssid.sa_data;

	wpa_printf(MSG_DEBUG, "PMKID candidate wireless event: "
		   "flags=0x%x index=%d bssid=" MACSTR, cand->flags,
		   cand->index, MAC2STR(addr));

	os_memset(&data, 0, sizeof(data));
	os_memcpy(data.pmkid_candidate.bssid, addr, ETH_ALEN);
	data.pmkid_candidate.index = cand->index;
	data.pmkid_candidate.preauth = cand->flags & IW_PMKID_CAND_PREAUTH;
	wpa_supplicant_event(drv->ctx, EVENT_PMKID_CANDIDATE, &data);

	return 0;
}


static int wpa_driver_nl80211_event_wireless_assocreqie(
	struct wpa_driver_nl80211_data *drv, const char *ev, int len)
{
	if (len < 0)
		return -1;

	wpa_hexdump(MSG_DEBUG, "AssocReq IE wireless event", (const u8 *) ev,
		    len);
	os_free(drv->assoc_req_ies);
	drv->assoc_req_ies = os_malloc(len);
	if (drv->assoc_req_ies == NULL) {
		drv->assoc_req_ies_len = 0;
		return -1;
	}
	os_memcpy(drv->assoc_req_ies, ev, len);
	drv->assoc_req_ies_len = len;

	return 0;
}


static int wpa_driver_nl80211_event_wireless_assocrespie(
	struct wpa_driver_nl80211_data *drv, const char *ev, int len)
{
	if (len < 0)
		return -1;

	wpa_hexdump(MSG_DEBUG, "AssocResp IE wireless event", (const u8 *) ev,
		    len);
	os_free(drv->assoc_resp_ies);
	drv->assoc_resp_ies = os_malloc(len);
	if (drv->assoc_resp_ies == NULL) {
		drv->assoc_resp_ies_len = 0;
		return -1;
	}
	os_memcpy(drv->assoc_resp_ies, ev, len);
	drv->assoc_resp_ies_len = len;

	return 0;
}


static void wpa_driver_nl80211_event_assoc_ies(struct wpa_driver_nl80211_data *drv)
{
	union wpa_event_data data;

	if (drv->assoc_req_ies == NULL && drv->assoc_resp_ies == NULL)
		return;

	os_memset(&data, 0, sizeof(data));
	if (drv->assoc_req_ies) {
		data.assoc_info.req_ies = drv->assoc_req_ies;
		drv->assoc_req_ies = NULL;
		data.assoc_info.req_ies_len = drv->assoc_req_ies_len;
	}
	if (drv->assoc_resp_ies) {
		data.assoc_info.resp_ies = drv->assoc_resp_ies;
		drv->assoc_resp_ies = NULL;
		data.assoc_info.resp_ies_len = drv->assoc_resp_ies_len;
	}

	wpa_supplicant_event(drv->ctx, EVENT_ASSOCINFO, &data);

	os_free(data.assoc_info.req_ies);
	os_free(data.assoc_info.resp_ies);
}


static void wpa_driver_nl80211_event_wireless(struct wpa_driver_nl80211_data *drv,
					   void *ctx, 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. */
		os_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_compiled > 18 &&
		    (iwe->cmd == IWEVMICHAELMICFAILURE ||
		     iwe->cmd == IWEVCUSTOM ||
		     iwe->cmd == IWEVASSOCREQIE ||
		     iwe->cmd == IWEVASSOCRESPIE ||
		     iwe->cmd == IWEVPMKIDCAND)) {
			/* WE-19 removed the pointer from struct iw_point */
			char *dpos = (char *) &iwe_buf.u.data.length;
			int dlen = dpos - (char *) &iwe_buf;
			os_memcpy(dpos, pos + IW_EV_LCP_LEN,
				  sizeof(struct iw_event) - dlen);
		} else {
			os_memcpy(&iwe_buf, pos, sizeof(struct iw_event));
			custom += IW_EV_POINT_OFF;
		}

		switch (iwe->cmd) {
		case SIOCGIWAP:
			wpa_printf(MSG_DEBUG, "Wireless event: new AP: "