+++ /dev/null
-/*
- * 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- * and IEEE has withdrawn it.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);
-}
projects / mech_eap.git / blobdiff