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