wpa_supplicant: Initial Revision 0.8.X
Based on:
commit 0725cc7b7efc434910e89865c42eda7ce61bbf08
Author: Jouni Malinen <j@w1.fi>
Date: Thu Apr 21 20:41:01 2011 +0300
Enable CONFIG_DRIVER_NL80211=y in the default configuration
nl80211 should be preferred over WEXT with any recent Linux
kernel version.
Change-Id: I26aec5afbbd4f4a1f5fd900912545b6f5050de64
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/src/ap/iapp.c b/src/ap/iapp.c
new file mode 100644
index 0000000..115d91e
--- /dev/null
+++ b/src/ap/iapp.c
@@ -0,0 +1,535 @@
+/*
+ * hostapd / IEEE 802.11F-2003 Inter-Access Point Protocol (IAPP)
+ * Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>
+ *
+ * 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.
+ *
+ * Note: IEEE 802.11F-2003 was a experimental use specification. It has expired
+ * and IEEE has withdrawn it. In other words, it is likely better to look at
+ * using some other mechanism for AP-to-AP communication than extending the
+ * implementation here.
+ */
+
+/* TODO:
+ * Level 1: no administrative or security support
+ * (e.g., static BSSID to IP address mapping in each AP)
+ * Level 2: support for dynamic mapping of BSSID to IP address
+ * Level 3: support for encryption and authentication of IAPP messages
+ * - add support for MOVE-notify and MOVE-response (this requires support for
+ * finding out IP address for previous AP using RADIUS)
+ * - add support for Send- and ACK-Security-Block to speedup IEEE 802.1X during
+ * reassociation to another AP
+ * - implement counters etc. for IAPP MIB
+ * - verify endianness of fields in IAPP messages; are they big-endian as
+ * used here?
+ * - RADIUS connection for AP registration and BSSID to IP address mapping
+ * - TCP connection for IAPP MOVE, CACHE
+ * - broadcast ESP for IAPP ADD-notify
+ * - ESP for IAPP MOVE messages
+ * - security block sending/processing
+ * - IEEE 802.11 context transfer
+ */
+
+#include "utils/includes.h"
+#include <net/if.h>
+#include <sys/ioctl.h>
+#ifdef USE_KERNEL_HEADERS
+#include <linux/if_packet.h>
+#else /* USE_KERNEL_HEADERS */
+#include <netpacket/packet.h>
+#endif /* USE_KERNEL_HEADERS */
+
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "common/ieee802_11_defs.h"
+#include "hostapd.h"
+#include "ap_config.h"
+#include "ieee802_11.h"
+#include "sta_info.h"
+#include "iapp.h"
+
+
+#define IAPP_MULTICAST "224.0.1.178"
+#define IAPP_UDP_PORT 3517
+#define IAPP_TCP_PORT 3517
+
+struct iapp_hdr {
+ u8 version;
+ u8 command;
+ be16 identifier;
+ be16 length;
+ /* followed by length-6 octets of data */
+} __attribute__ ((packed));
+
+#define IAPP_VERSION 0
+
+enum IAPP_COMMAND {
+ IAPP_CMD_ADD_notify = 0,
+ IAPP_CMD_MOVE_notify = 1,
+ IAPP_CMD_MOVE_response = 2,
+ IAPP_CMD_Send_Security_Block = 3,
+ IAPP_CMD_ACK_Security_Block = 4,
+ IAPP_CMD_CACHE_notify = 5,
+ IAPP_CMD_CACHE_response = 6,
+};
+
+
+/* ADD-notify - multicast UDP on the local LAN */
+struct iapp_add_notify {
+ u8 addr_len; /* ETH_ALEN */
+ u8 reserved;
+ u8 mac_addr[ETH_ALEN];
+ be16 seq_num;
+} __attribute__ ((packed));
+
+
+/* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
+struct iapp_layer2_update {
+ u8 da[ETH_ALEN]; /* broadcast */
+ u8 sa[ETH_ALEN]; /* STA addr */
+ be16 len; /* 6 */
+ u8 dsap; /* null DSAP address */
+ u8 ssap; /* null SSAP address, CR=Response */
+ u8 control;
+ u8 xid_info[3];
+} __attribute__ ((packed));
+
+
+/* MOVE-notify - unicast TCP */
+struct iapp_move_notify {
+ u8 addr_len; /* ETH_ALEN */
+ u8 reserved;
+ u8 mac_addr[ETH_ALEN];
+ u16 seq_num;
+ u16 ctx_block_len;
+ /* followed by ctx_block_len bytes */
+} __attribute__ ((packed));
+
+
+/* MOVE-response - unicast TCP */
+struct iapp_move_response {
+ u8 addr_len; /* ETH_ALEN */
+ u8 status;
+ u8 mac_addr[ETH_ALEN];
+ u16 seq_num;
+ u16 ctx_block_len;
+ /* followed by ctx_block_len bytes */
+} __attribute__ ((packed));
+
+enum {
+ IAPP_MOVE_SUCCESSFUL = 0,
+ IAPP_MOVE_DENIED = 1,
+ IAPP_MOVE_STALE_MOVE = 2,
+};
+
+
+/* CACHE-notify */
+struct iapp_cache_notify {
+ u8 addr_len; /* ETH_ALEN */
+ u8 reserved;
+ u8 mac_addr[ETH_ALEN];
+ u16 seq_num;
+ u8 current_ap[ETH_ALEN];
+ u16 ctx_block_len;
+ /* ctx_block_len bytes of context block followed by 16-bit context
+ * timeout */
+} __attribute__ ((packed));
+
+
+/* CACHE-response - unicast TCP */
+struct iapp_cache_response {
+ u8 addr_len; /* ETH_ALEN */
+ u8 status;
+ u8 mac_addr[ETH_ALEN];
+ u16 seq_num;
+} __attribute__ ((packed));
+
+enum {
+ IAPP_CACHE_SUCCESSFUL = 0,
+ IAPP_CACHE_STALE_CACHE = 1,
+};
+
+
+/* Send-Security-Block - unicast TCP */
+struct iapp_send_security_block {
+ u8 iv[8];
+ u16 sec_block_len;
+ /* followed by sec_block_len bytes of security block */
+} __attribute__ ((packed));
+
+
+/* ACK-Security-Block - unicast TCP */
+struct iapp_ack_security_block {
+ u8 iv[8];
+ u8 new_ap_ack_authenticator[48];
+} __attribute__ ((packed));
+
+
+struct iapp_data {
+ struct hostapd_data *hapd;
+ u16 identifier; /* next IAPP identifier */
+ struct in_addr own, multicast;
+ int udp_sock;
+ int packet_sock;
+};
+
+
+static void iapp_send_add(struct iapp_data *iapp, u8 *mac_addr, u16 seq_num)
+{
+ char buf[128];
+ struct iapp_hdr *hdr;
+ struct iapp_add_notify *add;
+ struct sockaddr_in addr;
+
+ /* Send IAPP ADD-notify to remove possible association from other APs
+ */
+
+ hdr = (struct iapp_hdr *) buf;
+ hdr->version = IAPP_VERSION;
+ hdr->command = IAPP_CMD_ADD_notify;
+ hdr->identifier = host_to_be16(iapp->identifier++);
+ hdr->length = host_to_be16(sizeof(*hdr) + sizeof(*add));
+
+ add = (struct iapp_add_notify *) (hdr + 1);
+ add->addr_len = ETH_ALEN;
+ add->reserved = 0;
+ os_memcpy(add->mac_addr, mac_addr, ETH_ALEN);
+
+ add->seq_num = host_to_be16(seq_num);
+
+ os_memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = iapp->multicast.s_addr;
+ addr.sin_port = htons(IAPP_UDP_PORT);
+ if (sendto(iapp->udp_sock, buf, (char *) (add + 1) - buf, 0,
+ (struct sockaddr *) &addr, sizeof(addr)) < 0)
+ perror("sendto[IAPP-ADD]");
+}
+
+
+static void iapp_send_layer2_update(struct iapp_data *iapp, u8 *addr)
+{
+ struct iapp_layer2_update msg;
+
+ /* Send Level 2 Update Frame to update forwarding tables in layer 2
+ * bridge devices */
+
+ /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
+ * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
+
+ os_memset(msg.da, 0xff, ETH_ALEN);
+ os_memcpy(msg.sa, addr, ETH_ALEN);
+ msg.len = host_to_be16(6);
+ msg.dsap = 0; /* NULL DSAP address */
+ msg.ssap = 0x01; /* NULL SSAP address, CR Bit: Response */
+ msg.control = 0xaf; /* XID response lsb.1111F101.
+ * F=0 (no poll command; unsolicited frame) */
+ msg.xid_info[0] = 0x81; /* XID format identifier */
+ msg.xid_info[1] = 1; /* LLC types/classes: Type 1 LLC */
+ msg.xid_info[2] = 1 << 1; /* XID sender's receive window size (RW)
+ * FIX: what is correct RW with 802.11? */
+
+ if (send(iapp->packet_sock, &msg, sizeof(msg), 0) < 0)
+ perror("send[L2 Update]");
+}
+
+
+/**
+ * iapp_new_station - IAPP processing for a new STA
+ * @iapp: IAPP data
+ * @sta: The associated station
+ */
+void iapp_new_station(struct iapp_data *iapp, struct sta_info *sta)
+{
+ struct ieee80211_mgmt *assoc;
+ u16 seq;
+
+ if (iapp == NULL)
+ return;
+
+ assoc = sta->last_assoc_req;
+ seq = assoc ? WLAN_GET_SEQ_SEQ(le_to_host16(assoc->seq_ctrl)) : 0;
+
+ /* IAPP-ADD.request(MAC Address, Sequence Number, Timeout) */
+ hostapd_logger(iapp->hapd, sta->addr, HOSTAPD_MODULE_IAPP,
+ HOSTAPD_LEVEL_DEBUG, "IAPP-ADD.request(seq=%d)", seq);
+ iapp_send_layer2_update(iapp, sta->addr);
+ iapp_send_add(iapp, sta->addr, seq);
+
+ if (assoc && WLAN_FC_GET_STYPE(le_to_host16(assoc->frame_control)) ==
+ WLAN_FC_STYPE_REASSOC_REQ) {
+ /* IAPP-MOVE.request(MAC Address, Sequence Number, Old AP,
+ * Context Block, Timeout)
+ */
+ /* TODO: Send IAPP-MOVE to the old AP; Map Old AP BSSID to
+ * IP address */
+ }
+}
+
+
+static void iapp_process_add_notify(struct iapp_data *iapp,
+ struct sockaddr_in *from,
+ struct iapp_hdr *hdr, int len)
+{
+ struct iapp_add_notify *add = (struct iapp_add_notify *) (hdr + 1);
+ struct sta_info *sta;
+
+ if (len != sizeof(*add)) {
+ printf("Invalid IAPP-ADD packet length %d (expected %lu)\n",
+ len, (unsigned long) sizeof(*add));
+ return;
+ }
+
+ sta = ap_get_sta(iapp->hapd, add->mac_addr);
+
+ /* IAPP-ADD.indication(MAC Address, Sequence Number) */
+ hostapd_logger(iapp->hapd, add->mac_addr, HOSTAPD_MODULE_IAPP,
+ HOSTAPD_LEVEL_INFO,
+ "Received IAPP ADD-notify (seq# %d) from %s:%d%s",
+ be_to_host16(add->seq_num),
+ inet_ntoa(from->sin_addr), ntohs(from->sin_port),
+ sta ? "" : " (STA not found)");
+
+ if (!sta)
+ return;
+
+ /* TODO: could use seq_num to try to determine whether last association
+ * to this AP is newer than the one advertised in IAPP-ADD. Although,
+ * this is not really a reliable verification. */
+
+ hostapd_logger(iapp->hapd, add->mac_addr, HOSTAPD_MODULE_IAPP,
+ HOSTAPD_LEVEL_DEBUG,
+ "Removing STA due to IAPP ADD-notify");
+ ap_sta_disconnect(iapp->hapd, sta, NULL, 0);
+}
+
+
+/**
+ * iapp_receive_udp - Process IAPP UDP frames
+ * @sock: File descriptor for the socket
+ * @eloop_ctx: IAPP data (struct iapp_data *)
+ * @sock_ctx: Not used
+ */
+static void iapp_receive_udp(int sock, void *eloop_ctx, void *sock_ctx)
+{
+ struct iapp_data *iapp = eloop_ctx;
+ int len, hlen;
+ unsigned char buf[128];
+ struct sockaddr_in from;
+ socklen_t fromlen;
+ struct iapp_hdr *hdr;
+
+ /* Handle incoming IAPP frames (over UDP/IP) */
+
+ fromlen = sizeof(from);
+ len = recvfrom(iapp->udp_sock, buf, sizeof(buf), 0,
+ (struct sockaddr *) &from, &fromlen);
+ if (len < 0) {
+ perror("recvfrom");
+ return;
+ }
+
+ if (from.sin_addr.s_addr == iapp->own.s_addr)
+ return; /* ignore own IAPP messages */
+
+ hostapd_logger(iapp->hapd, NULL, HOSTAPD_MODULE_IAPP,
+ HOSTAPD_LEVEL_DEBUG,
+ "Received %d byte IAPP frame from %s%s\n",
+ len, inet_ntoa(from.sin_addr),
+ len < (int) sizeof(*hdr) ? " (too short)" : "");
+
+ if (len < (int) sizeof(*hdr))
+ return;
+
+ hdr = (struct iapp_hdr *) buf;
+ hlen = be_to_host16(hdr->length);
+ hostapd_logger(iapp->hapd, NULL, HOSTAPD_MODULE_IAPP,
+ HOSTAPD_LEVEL_DEBUG,
+ "RX: version=%d command=%d id=%d len=%d\n",
+ hdr->version, hdr->command,
+ be_to_host16(hdr->identifier), hlen);
+ if (hdr->version != IAPP_VERSION) {
+ printf("Dropping IAPP frame with unknown version %d\n",
+ hdr->version);
+ return;
+ }
+ if (hlen > len) {
+ printf("Underflow IAPP frame (hlen=%d len=%d)\n", hlen, len);
+ return;
+ }
+ if (hlen < len) {
+ printf("Ignoring %d extra bytes from IAPP frame\n",
+ len - hlen);
+ len = hlen;
+ }
+
+ switch (hdr->command) {
+ case IAPP_CMD_ADD_notify:
+ iapp_process_add_notify(iapp, &from, hdr, hlen - sizeof(*hdr));
+ break;
+ case IAPP_CMD_MOVE_notify:
+ /* TODO: MOVE is using TCP; so move this to TCP handler once it
+ * is implemented.. */
+ /* IAPP-MOVE.indication(MAC Address, New BSSID,
+ * Sequence Number, AP Address, Context Block) */
+ /* TODO: process */
+ break;
+ default:
+ printf("Unknown IAPP command %d\n", hdr->command);
+ break;
+ }
+}
+
+
+struct iapp_data * iapp_init(struct hostapd_data *hapd, const char *iface)
+{
+ struct ifreq ifr;
+ struct sockaddr_ll addr;
+ int ifindex;
+ struct sockaddr_in *paddr, uaddr;
+ struct iapp_data *iapp;
+ struct ip_mreqn mreq;
+
+ iapp = os_zalloc(sizeof(*iapp));
+ if (iapp == NULL)
+ return NULL;
+ iapp->hapd = hapd;
+ iapp->udp_sock = iapp->packet_sock = -1;
+
+ /* TODO:
+ * open socket for sending and receiving IAPP frames over TCP
+ */
+
+ iapp->udp_sock = socket(PF_INET, SOCK_DGRAM, 0);
+ if (iapp->udp_sock < 0) {
+ perror("socket[PF_INET,SOCK_DGRAM]");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+
+ os_memset(&ifr, 0, sizeof(ifr));
+ os_strlcpy(ifr.ifr_name, iface, sizeof(ifr.ifr_name));
+ if (ioctl(iapp->udp_sock, SIOCGIFINDEX, &ifr) != 0) {
+ perror("ioctl(SIOCGIFINDEX)");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+ ifindex = ifr.ifr_ifindex;
+
+ if (ioctl(iapp->udp_sock, SIOCGIFADDR, &ifr) != 0) {
+ perror("ioctl(SIOCGIFADDR)");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+ paddr = (struct sockaddr_in *) &ifr.ifr_addr;
+ if (paddr->sin_family != AF_INET) {
+ printf("Invalid address family %i (SIOCGIFADDR)\n",
+ paddr->sin_family);
+ iapp_deinit(iapp);
+ return NULL;
+ }
+ iapp->own.s_addr = paddr->sin_addr.s_addr;
+
+ if (ioctl(iapp->udp_sock, SIOCGIFBRDADDR, &ifr) != 0) {
+ perror("ioctl(SIOCGIFBRDADDR)");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+ paddr = (struct sockaddr_in *) &ifr.ifr_addr;
+ if (paddr->sin_family != AF_INET) {
+ printf("Invalid address family %i (SIOCGIFBRDADDR)\n",
+ paddr->sin_family);
+ iapp_deinit(iapp);
+ return NULL;
+ }
+ inet_aton(IAPP_MULTICAST, &iapp->multicast);
+
+ os_memset(&uaddr, 0, sizeof(uaddr));
+ uaddr.sin_family = AF_INET;
+ uaddr.sin_port = htons(IAPP_UDP_PORT);
+ if (bind(iapp->udp_sock, (struct sockaddr *) &uaddr,
+ sizeof(uaddr)) < 0) {
+ perror("bind[UDP]");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+
+ os_memset(&mreq, 0, sizeof(mreq));
+ mreq.imr_multiaddr = iapp->multicast;
+ mreq.imr_address.s_addr = INADDR_ANY;
+ mreq.imr_ifindex = 0;
+ if (setsockopt(iapp->udp_sock, SOL_IP, IP_ADD_MEMBERSHIP, &mreq,
+ sizeof(mreq)) < 0) {
+ perror("setsockopt[UDP,IP_ADD_MEMBERSHIP]");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+
+ iapp->packet_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+ if (iapp->packet_sock < 0) {
+ perror("socket[PF_PACKET,SOCK_RAW]");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+
+ os_memset(&addr, 0, sizeof(addr));
+ addr.sll_family = AF_PACKET;
+ addr.sll_ifindex = ifindex;
+ if (bind(iapp->packet_sock, (struct sockaddr *) &addr,
+ sizeof(addr)) < 0) {
+ perror("bind[PACKET]");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+
+ if (eloop_register_read_sock(iapp->udp_sock, iapp_receive_udp,
+ iapp, NULL)) {
+ printf("Could not register read socket for IAPP.\n");
+ iapp_deinit(iapp);
+ return NULL;
+ }
+
+ printf("IEEE 802.11F (IAPP) using interface %s\n", iface);
+
+ /* TODO: For levels 2 and 3: send RADIUS Initiate-Request, receive
+ * RADIUS Initiate-Accept or Initiate-Reject. IAPP port should actually
+ * be openned only after receiving Initiate-Accept. If Initiate-Reject
+ * is received, IAPP is not started. */
+
+ return iapp;
+}
+
+
+void iapp_deinit(struct iapp_data *iapp)
+{
+ struct ip_mreqn mreq;
+
+ if (iapp == NULL)
+ return;
+
+ if (iapp->udp_sock >= 0) {
+ os_memset(&mreq, 0, sizeof(mreq));
+ mreq.imr_multiaddr = iapp->multicast;
+ mreq.imr_address.s_addr = INADDR_ANY;
+ mreq.imr_ifindex = 0;
+ if (setsockopt(iapp->udp_sock, SOL_IP, IP_DROP_MEMBERSHIP,
+ &mreq, sizeof(mreq)) < 0) {
+ perror("setsockopt[UDP,IP_DEL_MEMBERSHIP]");
+ }
+
+ eloop_unregister_read_sock(iapp->udp_sock);
+ close(iapp->udp_sock);
+ }
+ if (iapp->packet_sock >= 0) {
+ eloop_unregister_read_sock(iapp->packet_sock);
+ close(iapp->packet_sock);
+ }
+ os_free(iapp);
+}