www.project-moonshot.org Git - mech_eap.orig/blob - src/drivers/driver_wired.c

   1 /*
   2  * Wired Ethernet driver interface
   3  * Copyright (c) 2005-2009, Jouni Malinen <j@w1.fi>
   4  * Copyright (c) 2004, Gunter Burchardt <tira@isx.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Alternatively, this software may be distributed under the terms of BSD
  11  * license.
  12  *
  13  * See README and COPYING for more details.
  14  */
  15
  16 #include "includes.h"
  17 #include <sys/ioctl.h>
  18 #include <net/if.h>
  19 #ifdef __linux__
  20 #include <netpacket/packet.h>
  21 #include <net/if_arp.h>
  22 #include <net/if.h>
  23 #endif /* __linux__ */
  24 #if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
  25 #include <net/if_dl.h>
  26 #endif /* defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__) */
  27 #ifdef __sun__
  28 #include <sys/sockio.h>
  29 #endif /* __sun__ */
  30
  31 #include "common.h"
  32 #include "eloop.h"
  33 #include "driver.h"
  34
  35 #ifdef _MSC_VER
  36 #pragma pack(push, 1)
  37 #endif /* _MSC_VER */
  38
  39 struct ieee8023_hdr {
  40         u8 dest[6];
  41         u8 src[6];
  42         u16 ethertype;
  43 } STRUCT_PACKED;
  44
  45 #ifdef _MSC_VER
  46 #pragma pack(pop)
  47 #endif /* _MSC_VER */
  48
  49 static const u8 pae_group_addr[ETH_ALEN] =
  50 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };
  51
  52
  53 struct wpa_driver_wired_data {
  54         char ifname[IFNAMSIZ + 1];
  55         void *ctx;
  56
  57         int sock; /* raw packet socket for driver access */
  58         int dhcp_sock; /* socket for dhcp packets */
  59         int use_pae_group_addr;
  60
  61         int pf_sock;
  62         int membership, multi, iff_allmulti, iff_up;
  63 };
  64
  65
  66 /* TODO: detecting new devices should eventually be changed from using DHCP
  67  * snooping to trigger on any packet from a new layer 2 MAC address, e.g.,
  68  * based on ebtables, etc. */
  69
  70 struct dhcp_message {
  71         u_int8_t op;
  72         u_int8_t htype;
  73         u_int8_t hlen;
  74         u_int8_t hops;
  75         u_int32_t xid;
  76         u_int16_t secs;
  77         u_int16_t flags;
  78         u_int32_t ciaddr;
  79         u_int32_t yiaddr;
  80         u_int32_t siaddr;
  81         u_int32_t giaddr;
  82         u_int8_t chaddr[16];
  83         u_int8_t sname[64];
  84         u_int8_t file[128];
  85         u_int32_t cookie;
  86         u_int8_t options[308]; /* 312 - cookie */
  87 };
  88
  89
  90 static int wired_multicast_membership(int sock, int ifindex,
  91                                       const u8 *addr, int add)
  92 {
  93 #ifdef __linux__
  94         struct packet_mreq mreq;
  95
  96         if (sock < 0)
  97                 return -1;
  98
  99         os_memset(&mreq, 0, sizeof(mreq));
 100         mreq.mr_ifindex = ifindex;
 101         mreq.mr_type = PACKET_MR_MULTICAST;
 102         mreq.mr_alen = ETH_ALEN;
 103         os_memcpy(mreq.mr_address, addr, ETH_ALEN);
 104
 105         if (setsockopt(sock, SOL_PACKET,
 106                        add ? PACKET_ADD_MEMBERSHIP : PACKET_DROP_MEMBERSHIP,
 107                        &mreq, sizeof(mreq)) < 0) {
 108                 perror("setsockopt");
 109                 return -1;
 110         }
 111         return 0;
 112 #else /* __linux__ */
 113         return -1;
 114 #endif /* __linux__ */
 115 }
 116
 117
 118 #ifdef __linux__
 119 static void handle_data(void *ctx, unsigned char *buf, size_t len)
 120 {
 121 #ifdef HOSTAPD
 122         struct ieee8023_hdr *hdr;
 123         u8 *pos, *sa;
 124         size_t left;
 125         union wpa_event_data event;
 126
 127         /* must contain at least ieee8023_hdr 6 byte source, 6 byte dest,
 128          * 2 byte ethertype */
 129         if (len < 14) {
 130                 wpa_printf(MSG_MSGDUMP, "handle_data: too short (%lu)",
 131                            (unsigned long) len);
 132                 return;
 133         }
 134
 135         hdr = (struct ieee8023_hdr *) buf;
 136
 137         switch (ntohs(hdr->ethertype)) {
 138                 case ETH_P_PAE:
 139                         wpa_printf(MSG_MSGDUMP, "Received EAPOL packet");
 140                         sa = hdr->src;
 141                         os_memset(&event, 0, sizeof(event));
 142                         event.new_sta.addr = sa;
 143                         wpa_supplicant_event(ctx, EVENT_NEW_STA, &event);
 144
 145                         pos = (u8 *) (hdr + 1);
 146                         left = len - sizeof(*hdr);
 147                         drv_event_eapol_rx(ctx, sa, pos, left);
 148                 break;
 149
 150         default:
 151                 wpa_printf(MSG_DEBUG, "Unknown ethertype 0x%04x in data frame",
 152                            ntohs(hdr->ethertype));
 153                 break;
 154         }
 155 #endif /* HOSTAPD */
 156 }
 157
 158
 159 static void handle_read(int sock, void *eloop_ctx, void *sock_ctx)
 160 {
 161         int len;
 162         unsigned char buf[3000];
 163
 164         len = recv(sock, buf, sizeof(buf), 0);
 165         if (len < 0) {
 166                 perror("recv");
 167                 return;
 168         }
 169
 170         handle_data(eloop_ctx, buf, len);
 171 }
 172
 173
 174 static void handle_dhcp(int sock, void *eloop_ctx, void *sock_ctx)
 175 {
 176         int len;
 177         unsigned char buf[3000];
 178         struct dhcp_message *msg;
 179         u8 *mac_address;
 180         union wpa_event_data event;
 181
 182         len = recv(sock, buf, sizeof(buf), 0);
 183         if (len < 0) {
 184                 perror("recv");
 185                 return;
 186         }
 187
 188         /* must contain at least dhcp_message->chaddr */
 189         if (len < 44) {
 190                 wpa_printf(MSG_MSGDUMP, "handle_dhcp: too short (%d)", len);
 191                 return;
 192         }
 193
 194         msg = (struct dhcp_message *) buf;
 195         mac_address = (u8 *) &(msg->chaddr);
 196
 197         wpa_printf(MSG_MSGDUMP, "Got DHCP broadcast packet from " MACSTR,
 198                    MAC2STR(mac_address));
 199
 200         os_memset(&event, 0, sizeof(event));
 201         event.new_sta.addr = mac_address;
 202         wpa_supplicant_event(eloop_ctx, EVENT_NEW_STA, &event);
 203 }
 204 #endif /* __linux__ */
 205
 206
 207 static int wired_init_sockets(struct wpa_driver_wired_data *drv, u8 *own_addr)
 208 {
 209 #ifdef __linux__
 210         struct ifreq ifr;
 211         struct sockaddr_ll addr;
 212         struct sockaddr_in addr2;
 213         int n = 1;
 214
 215         drv->sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_PAE));
 216         if (drv->sock < 0) {
 217                 perror("socket[PF_PACKET,SOCK_RAW]");
 218                 return -1;
 219         }
 220
 221         if (eloop_register_read_sock(drv->sock, handle_read, drv->ctx, NULL)) {
 222                 printf("Could not register read socket\n");
 223                 return -1;
 224         }
 225
 226         os_memset(&ifr, 0, sizeof(ifr));
 227         os_strlcpy(ifr.ifr_name, drv->ifname, sizeof(ifr.ifr_name));
 228         if (ioctl(drv->sock, SIOCGIFINDEX, &ifr) != 0) {
 229                 perror("ioctl(SIOCGIFINDEX)");
 230                 return -1;
 231         }
 232
 233         os_memset(&addr, 0, sizeof(addr));
 234         addr.sll_family = AF_PACKET;
 235         addr.sll_ifindex = ifr.ifr_ifindex;
 236         wpa_printf(MSG_DEBUG, "Opening raw packet socket for ifindex %d",
 237                    addr.sll_ifindex);
 238
 239         if (bind(drv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 240                 perror("bind");
 241                 return -1;
 242         }
 243
 244         /* filter multicast address */
 245         if (wired_multicast_membership(drv->sock, ifr.ifr_ifindex,
 246                                        pae_group_addr, 1) < 0) {
 247                 wpa_printf(MSG_ERROR, "wired: Failed to add multicast group "
 248                            "membership");
 249                 return -1;
 250         }
 251
 252         os_memset(&ifr, 0, sizeof(ifr));
 253         os_strlcpy(ifr.ifr_name, drv->ifname, sizeof(ifr.ifr_name));
 254         if (ioctl(drv->sock, SIOCGIFHWADDR, &ifr) != 0) {
 255                 perror("ioctl(SIOCGIFHWADDR)");
 256                 return -1;
 257         }
 258
 259         if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
 260                 printf("Invalid HW-addr family 0x%04x\n",
 261                        ifr.ifr_hwaddr.sa_family);
 262                 return -1;
 263         }
 264         os_memcpy(own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
 265
 266         /* setup dhcp listen socket for sta detection */
 267         if ((drv->dhcp_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 268                 perror("socket call failed for dhcp");
 269                 return -1;
 270         }
 271
 272         if (eloop_register_read_sock(drv->dhcp_sock, handle_dhcp, drv->ctx,
 273                                      NULL)) {
 274                 printf("Could not register read socket\n");
 275                 return -1;
 276         }
 277
 278         os_memset(&addr2, 0, sizeof(addr2));
 279         addr2.sin_family = AF_INET;
 280         addr2.sin_port = htons(67);
 281         addr2.sin_addr.s_addr = INADDR_ANY;
 282
 283         if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_REUSEADDR, (char *) &n,
 284                        sizeof(n)) == -1) {
 285                 perror("setsockopt[SOL_SOCKET,SO_REUSEADDR]");
 286                 return -1;
 287         }
 288         if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_BROADCAST, (char *) &n,
 289                        sizeof(n)) == -1) {
 290                 perror("setsockopt[SOL_SOCKET,SO_BROADCAST]");
 291                 return -1;
 292         }
 293
 294         os_memset(&ifr, 0, sizeof(ifr));
 295         os_strlcpy(ifr.ifr_ifrn.ifrn_name, drv->ifname, IFNAMSIZ);
 296         if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_BINDTODEVICE,
 297                        (char *) &ifr, sizeof(ifr)) < 0) {
 298                 perror("setsockopt[SOL_SOCKET,SO_BINDTODEVICE]");
 299                 return -1;
 300         }
 301
 302         if (bind(drv->dhcp_sock, (struct sockaddr *) &addr2,
 303                  sizeof(struct sockaddr)) == -1) {
 304                 perror("bind");
 305                 return -1;
 306         }
 307
 308         return 0;
 309 #else /* __linux__ */
 310         return -1;
 311 #endif /* __linux__ */
 312 }
 313
 314
 315 static int wired_send_eapol(void *priv, const u8 *addr,
 316                             const u8 *data, size_t data_len, int encrypt,
 317                             const u8 *own_addr)
 318 {
 319         struct wpa_driver_wired_data *drv = priv;
 320         struct ieee8023_hdr *hdr;
 321         size_t len;
 322         u8 *pos;
 323         int res;
 324
 325         len = sizeof(*hdr) + data_len;
 326         hdr = os_zalloc(len);
 327         if (hdr == NULL) {
 328                 printf("malloc() failed for wired_send_eapol(len=%lu)\n",
 329                        (unsigned long) len);
 330                 return -1;
 331         }
 332
 333         os_memcpy(hdr->dest, drv->use_pae_group_addr ? pae_group_addr : addr,
 334                   ETH_ALEN);
 335         os_memcpy(hdr->src, own_addr, ETH_ALEN);
 336         hdr->ethertype = htons(ETH_P_PAE);
 337
 338         pos = (u8 *) (hdr + 1);
 339         os_memcpy(pos, data, data_len);
 340
 341         res = send(drv->sock, (u8 *) hdr, len, 0);
 342         os_free(hdr);
 343
 344         if (res < 0) {
 345                 perror("wired_send_eapol: send");
 346                 printf("wired_send_eapol - packet len: %lu - failed\n",
 347                        (unsigned long) len);
 348         }
 349
 350         return res;
 351 }
 352
 353
 354 static void * wired_driver_hapd_init(struct hostapd_data *hapd,
 355                                      struct wpa_init_params *params)
 356 {
 357         struct wpa_driver_wired_data *drv;
 358
 359         drv = os_zalloc(sizeof(struct wpa_driver_wired_data));
 360         if (drv == NULL) {
 361                 printf("Could not allocate memory for wired driver data\n");
 362                 return NULL;
 363         }
 364
 365         drv->ctx = hapd;
 366         os_strlcpy(drv->ifname, params->ifname, sizeof(drv->ifname));
 367         drv->use_pae_group_addr = params->use_pae_group_addr;
 368
 369         if (wired_init_sockets(drv, params->own_addr)) {
 370                 os_free(drv);
 371                 return NULL;
 372         }
 373
 374         return drv;
 375 }
 376
 377
 378 static void wired_driver_hapd_deinit(void *priv)
 379 {
 380         struct wpa_driver_wired_data *drv = priv;
 381
 382         if (drv->sock >= 0)
 383                 close(drv->sock);
 384
 385         if (drv->dhcp_sock >= 0)
 386                 close(drv->dhcp_sock);
 387
 388         os_free(drv);
 389 }
 390
 391
 392 static int wpa_driver_wired_get_ssid(void *priv, u8 *ssid)
 393 {
 394         ssid[0] = 0;
 395         return 0;
 396 }
 397
 398
 399 static int wpa_driver_wired_get_bssid(void *priv, u8 *bssid)
 400 {
 401         /* Report PAE group address as the "BSSID" for wired connection. */
 402         os_memcpy(bssid, pae_group_addr, ETH_ALEN);
 403         return 0;
 404 }
 405
 406
 407 static int wpa_driver_wired_get_capa(void *priv, struct wpa_driver_capa *capa)
 408 {
 409         os_memset(capa, 0, sizeof(*capa));
 410         capa->flags = WPA_DRIVER_FLAGS_WIRED;
 411         return 0;
 412 }
 413
 414
 415 static int wpa_driver_wired_get_ifflags(const char *ifname, int *flags)
 416 {
 417         struct ifreq ifr;
 418         int s;
 419
 420         s = socket(PF_INET, SOCK_DGRAM, 0);
 421         if (s < 0) {
 422                 perror("socket");
 423                 return -1;
 424         }
 425
 426         os_memset(&ifr, 0, sizeof(ifr));
 427         os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 428         if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
 429                 perror("ioctl[SIOCGIFFLAGS]");
 430                 close(s);
 431                 return -1;
 432         }
 433         close(s);
 434         *flags = ifr.ifr_flags & 0xffff;
 435         return 0;
 436 }
 437
 438
 439 static int wpa_driver_wired_set_ifflags(const char *ifname, int flags)
 440 {
 441         struct ifreq ifr;
 442         int s;
 443
 444         s = socket(PF_INET, SOCK_DGRAM, 0);
 445         if (s < 0) {
 446                 perror("socket");
 447                 return -1;
 448         }
 449
 450         os_memset(&ifr, 0, sizeof(ifr));
 451         os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 452         ifr.ifr_flags = flags & 0xffff;
 453         if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
 454                 perror("ioctl[SIOCSIFFLAGS]");
 455                 close(s);
 456                 return -1;
 457         }
 458         close(s);
 459         return 0;
 460 }
 461
 462
 463 static int wpa_driver_wired_multi(const char *ifname, const u8 *addr, int add)
 464 {
 465         struct ifreq ifr;
 466         int s;
 467
 468 #ifdef __sun__
 469         return -1;
 470 #endif /* __sun__ */
 471
 472         s = socket(PF_INET, SOCK_DGRAM, 0);
 473         if (s < 0) {
 474                 perror("socket");
 475                 return -1;
 476         }
 477
 478         os_memset(&ifr, 0, sizeof(ifr));
 479         os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 480 #ifdef __linux__
 481         ifr.ifr_hwaddr.sa_family = AF_UNSPEC;
 482         os_memcpy(ifr.ifr_hwaddr.sa_data, addr, ETH_ALEN);
 483 #endif /* __linux__ */
 484 #if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
 485         {
 486                 struct sockaddr_dl *dlp;
 487                 dlp = (struct sockaddr_dl *) &ifr.ifr_addr;
 488                 dlp->sdl_len = sizeof(struct sockaddr_dl);
 489                 dlp->sdl_family = AF_LINK;
 490                 dlp->sdl_index = 0;
 491                 dlp->sdl_nlen = 0;
 492                 dlp->sdl_alen = ETH_ALEN;
 493                 dlp->sdl_slen = 0;
 494                 os_memcpy(LLADDR(dlp), addr, ETH_ALEN);
 495         }
 496 #endif /* defined(__FreeBSD__) || defined(__DragonFly__) || defined(FreeBSD_kernel__) */
 497 #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
 498         {
 499                 struct sockaddr *sap;
 500                 sap = (struct sockaddr *) &ifr.ifr_addr;
 501                 sap->sa_len = sizeof(struct sockaddr);
 502                 sap->sa_family = AF_UNSPEC;
 503                 os_memcpy(sap->sa_data, addr, ETH_ALEN);
 504         }
 505 #endif /* defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__) */
 506
 507         if (ioctl(s, add ? SIOCADDMULTI : SIOCDELMULTI, (caddr_t) &ifr) < 0) {
 508                 perror("ioctl[SIOC{ADD/DEL}MULTI]");
 509                 close(s);
 510                 return -1;
 511         }
 512         close(s);
 513         return 0;
 514 }
 515
 516
 517 static void * wpa_driver_wired_init(void *ctx, const char *ifname)
 518 {
 519         struct wpa_driver_wired_data *drv;
 520         int flags;
 521
 522         drv = os_zalloc(sizeof(*drv));
 523         if (drv == NULL)
 524                 return NULL;
 525         os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
 526         drv->ctx = ctx;
 527
 528 #ifdef __linux__
 529         drv->pf_sock = socket(PF_PACKET, SOCK_DGRAM, 0);
 530         if (drv->pf_sock < 0)
 531                 perror("socket(PF_PACKET)");
 532 #else /* __linux__ */
 533         drv->pf_sock = -1;
 534 #endif /* __linux__ */
 535
 536         if (wpa_driver_wired_get_ifflags(ifname, &flags) == 0 &&
 537             !(flags & IFF_UP) &&
 538             wpa_driver_wired_set_ifflags(ifname, flags | IFF_UP) == 0) {
 539                 drv->iff_up = 1;
 540         }
 541
 542         if (wired_multicast_membership(drv->pf_sock,
 543                                        if_nametoindex(drv->ifname),
 544                                        pae_group_addr, 1) == 0) {
 545                 wpa_printf(MSG_DEBUG, "%s: Added multicast membership with "
 546                            "packet socket", __func__);
 547                 drv->membership = 1;
 548         } else if (wpa_driver_wired_multi(ifname, pae_group_addr, 1) == 0) {
 549                 wpa_printf(MSG_DEBUG, "%s: Added multicast membership with "
 550                            "SIOCADDMULTI", __func__);
 551                 drv->multi = 1;
 552         } else if (wpa_driver_wired_get_ifflags(ifname, &flags) < 0) {
 553                 wpa_printf(MSG_INFO, "%s: Could not get interface "
 554                            "flags", __func__);
 555                 os_free(drv);
 556                 return NULL;
 557         } else if (flags & IFF_ALLMULTI) {
 558                 wpa_printf(MSG_DEBUG, "%s: Interface is already configured "
 559                            "for multicast", __func__);
 560         } else if (wpa_driver_wired_set_ifflags(ifname,
 561                                                 flags | IFF_ALLMULTI) < 0) {
 562                 wpa_printf(MSG_INFO, "%s: Failed to enable allmulti",
 563                            __func__);
 564                 os_free(drv);
 565                 return NULL;
 566         } else {
 567                 wpa_printf(MSG_DEBUG, "%s: Enabled allmulti mode",
 568                            __func__);
 569                 drv->iff_allmulti = 1;
 570         }
 571
 572         return drv;
 573 }
 574
 575
 576 static void wpa_driver_wired_deinit(void *priv)
 577 {
 578         struct wpa_driver_wired_data *drv = priv;
 579         int flags;
 580
 581         if (drv->membership &&
 582             wired_multicast_membership(drv->pf_sock,
 583                                        if_nametoindex(drv->ifname),
 584                                        pae_group_addr, 0) < 0) {
 585                 wpa_printf(MSG_DEBUG, "%s: Failed to remove PAE multicast "
 586                            "group (PACKET)", __func__);
 587         }
 588
 589         if (drv->multi &&
 590             wpa_driver_wired_multi(drv->ifname, pae_group_addr, 0) < 0) {
 591                 wpa_printf(MSG_DEBUG, "%s: Failed to remove PAE multicast "
 592                            "group (SIOCDELMULTI)", __func__);
 593         }
 594
 595         if (drv->iff_allmulti &&
 596             (wpa_driver_wired_get_ifflags(drv->ifname, &flags) < 0 ||
 597              wpa_driver_wired_set_ifflags(drv->ifname,
 598                                           flags & ~IFF_ALLMULTI) < 0)) {
 599                 wpa_printf(MSG_DEBUG, "%s: Failed to disable allmulti mode",
 600                            __func__);
 601         }
 602
 603         if (drv->iff_up &&
 604             wpa_driver_wired_get_ifflags(drv->ifname, &flags) == 0 &&
 605             (flags & IFF_UP) &&
 606             wpa_driver_wired_set_ifflags(drv->ifname, flags & ~IFF_UP) < 0) {
 607                 wpa_printf(MSG_DEBUG, "%s: Failed to set the interface down",
 608                            __func__);
 609         }
 610
 611         if (drv->pf_sock != -1)
 612                 close(drv->pf_sock);
 613
 614         os_free(drv);
 615 }
 616
 617
 618 const struct wpa_driver_ops wpa_driver_wired_ops = {
 619         .name = "wired",
 620         .desc = "Wired Ethernet driver",
 621         .hapd_init = wired_driver_hapd_init,
 622         .hapd_deinit = wired_driver_hapd_deinit,
 623         .hapd_send_eapol = wired_send_eapol,
 624         .get_ssid = wpa_driver_wired_get_ssid,
 625         .get_bssid = wpa_driver_wired_get_bssid,
 626         .get_capa = wpa_driver_wired_get_capa,
 627         .init = wpa_driver_wired_init,
 628         .deinit = wpa_driver_wired_deinit,
 629 };