wpa_supplicant/src/drivers/driver_wired.c

   1 /*
   2  * WPA Supplicant - wired Ethernet driver interface
   3  * Copyright (c) 2005-2007, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16 #include <sys/ioctl.h>
  17 #include <net/if.h>
  18 #ifdef __linux__
  19 #include <netpacket/packet.h>
  20 #endif /* __linux__ */
  21 #ifdef __FreeBSD__
  22 #include <net/if_dl.h>
  23 #endif /* __FreeBSD__ */
  24
  25 #include "common.h"
  26 #include "driver.h"
  27
  28
  29 static const u8 pae_group_addr[ETH_ALEN] =
  30 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };
  31
  32
  33 struct wpa_driver_wired_data {
  34         void *ctx;
  35         int pf_sock;
  36         char ifname[IFNAMSIZ + 1];
  37         int membership, multi, iff_allmulti, iff_up;
  38 };
  39
  40
  41 static int wpa_driver_wired_get_ssid(void *priv, u8 *ssid)
  42 {
  43         ssid[0] = 0;
  44         return 0;
  45 }
  46
  47
  48 static int wpa_driver_wired_get_bssid(void *priv, u8 *bssid)
  49 {
  50         /* Report PAE group address as the "BSSID" for wired connection. */
  51         os_memcpy(bssid, pae_group_addr, ETH_ALEN);
  52         return 0;
  53 }
  54
  55
  56 static int wpa_driver_wired_get_ifflags(const char *ifname, int *flags)
  57 {
  58         struct ifreq ifr;
  59         int s;
  60
  61         s = socket(PF_INET, SOCK_DGRAM, 0);
  62         if (s < 0) {
  63                 perror("socket");
  64                 return -1;
  65         }
  66
  67         os_memset(&ifr, 0, sizeof(ifr));
  68         os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
  69         if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
  70                 perror("ioctl[SIOCGIFFLAGS]");
  71                 close(s);
  72                 return -1;
  73         }
  74         close(s);
  75         *flags = ifr.ifr_flags & 0xffff;
  76         return 0;
  77 }
  78
  79
  80 static int wpa_driver_wired_set_ifflags(const char *ifname, int flags)
  81 {
  82         struct ifreq ifr;
  83         int s;
  84
  85         s = socket(PF_INET, SOCK_DGRAM, 0);
  86         if (s < 0) {
  87                 perror("socket");
  88                 return -1;
  89         }
  90
  91         os_memset(&ifr, 0, sizeof(ifr));
  92         os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
  93         ifr.ifr_flags = flags & 0xffff;
  94         if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
  95                 perror("ioctl[SIOCSIFFLAGS]");
  96                 close(s);
  97                 return -1;
  98         }
  99         close(s);
 100         return 0;
 101 }
 102
 103
 104 static int wpa_driver_wired_multi(const char *ifname, const u8 *addr, int add)
 105 {
 106         struct ifreq ifr;
 107         int s;
 108
 109         s = socket(PF_INET, SOCK_DGRAM, 0);
 110         if (s < 0) {
 111                 perror("socket");
 112                 return -1;
 113         }
 114
 115         os_memset(&ifr, 0, sizeof(ifr));
 116         os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 117 #ifdef __linux__
 118         ifr.ifr_hwaddr.sa_family = AF_UNSPEC;
 119         os_memcpy(ifr.ifr_hwaddr.sa_data, addr, ETH_ALEN);
 120 #endif /* __linux__ */
 121 #ifdef __FreeBSD__
 122         {
 123                 struct sockaddr_dl *dlp;
 124                 dlp = (struct sockaddr_dl *) &ifr.ifr_addr;
 125                 dlp->sdl_len = sizeof(struct sockaddr_dl);
 126                 dlp->sdl_family = AF_LINK;
 127                 dlp->sdl_index = 0;
 128                 dlp->sdl_nlen = 0;
 129                 dlp->sdl_alen = ETH_ALEN;
 130                 dlp->sdl_slen = 0;
 131                 os_memcpy(LLADDR(dlp), addr, ETH_ALEN);
 132         }
 133 #endif /* __FreeBSD__ */
 134
 135         if (ioctl(s, add ? SIOCADDMULTI : SIOCDELMULTI, (caddr_t) &ifr) < 0) {
 136                 perror("ioctl[SIOC{ADD/DEL}MULTI]");
 137                 close(s);
 138                 return -1;
 139         }
 140         close(s);
 141         return 0;
 142 }
 143
 144
 145 static int wpa_driver_wired_membership(struct wpa_driver_wired_data *drv,
 146                                        const u8 *addr, int add)
 147 {
 148 #ifdef __linux__
 149         struct packet_mreq mreq;
 150
 151         if (drv->pf_sock == -1)
 152                 return -1;
 153
 154         os_memset(&mreq, 0, sizeof(mreq));
 155         mreq.mr_ifindex = if_nametoindex(drv->ifname);
 156         mreq.mr_type = PACKET_MR_MULTICAST;
 157         mreq.mr_alen = ETH_ALEN;
 158         os_memcpy(mreq.mr_address, addr, ETH_ALEN);
 159
 160         if (setsockopt(drv->pf_sock, SOL_PACKET,
 161                        add ? PACKET_ADD_MEMBERSHIP : PACKET_DROP_MEMBERSHIP,
 162                        &mreq, sizeof(mreq)) < 0) {
 163                 perror("setsockopt");
 164                 return -1;
 165         }
 166         return 0;
 167 #else /* __linux__ */
 168         return -1;
 169 #endif /* __linux__ */
 170 }
 171
 172
 173 static void * wpa_driver_wired_init(void *ctx, const char *ifname)
 174 {
 175         struct wpa_driver_wired_data *drv;
 176         int flags;
 177
 178         drv = os_zalloc(sizeof(*drv));
 179         if (drv == NULL)
 180                 return NULL;
 181         os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
 182         drv->ctx = ctx;
 183
 184 #ifdef __linux__
 185         drv->pf_sock = socket(PF_PACKET, SOCK_DGRAM, 0);
 186         if (drv->pf_sock < 0)
 187                 perror("socket(PF_PACKET)");
 188 #else /* __linux__ */
 189         drv->pf_sock = -1;
 190 #endif /* __linux__ */
 191
 192         if (wpa_driver_wired_get_ifflags(ifname, &flags) == 0 &&
 193             !(flags & IFF_UP) &&
 194             wpa_driver_wired_set_ifflags(ifname, flags | IFF_UP) == 0) {
 195                 drv->iff_up = 1;
 196         }
 197
 198         if (wpa_driver_wired_membership(drv, pae_group_addr, 1) == 0) {
 199                 wpa_printf(MSG_DEBUG, "%s: Added multicast membership with "
 200                            "packet socket", __func__);
 201                 drv->membership = 1;
 202         } else if (wpa_driver_wired_multi(ifname, pae_group_addr, 1) == 0) {
 203                 wpa_printf(MSG_DEBUG, "%s: Added multicast membership with "
 204                            "SIOCADDMULTI", __func__);
 205                 drv->multi = 1;
 206         } else if (wpa_driver_wired_get_ifflags(ifname, &flags) < 0) {
 207                 wpa_printf(MSG_INFO, "%s: Could not get interface "
 208                            "flags", __func__);
 209                 os_free(drv);
 210                 return NULL;
 211         } else if (flags & IFF_ALLMULTI) {
 212                 wpa_printf(MSG_DEBUG, "%s: Interface is already configured "
 213                            "for multicast", __func__);
 214         } else if (wpa_driver_wired_set_ifflags(ifname,
 215                                                 flags | IFF_ALLMULTI) < 0) {
 216                 wpa_printf(MSG_INFO, "%s: Failed to enable allmulti",
 217                            __func__);
 218                 os_free(drv);
 219                 return NULL;
 220         } else {
 221                 wpa_printf(MSG_DEBUG, "%s: Enabled allmulti mode",
 222                            __func__);
 223                 drv->iff_allmulti = 1;
 224         }
 225
 226         return drv;
 227 }
 228
 229
 230 static void wpa_driver_wired_deinit(void *priv)
 231 {
 232         struct wpa_driver_wired_data *drv = priv;
 233         int flags;
 234
 235         if (drv->membership &&
 236             wpa_driver_wired_membership(drv, pae_group_addr, 0) < 0) {
 237                 wpa_printf(MSG_DEBUG, "%s: Failed to remove PAE multicast "
 238                            "group (PACKET)", __func__);
 239         }
 240
 241         if (drv->multi &&
 242             wpa_driver_wired_multi(drv->ifname, pae_group_addr, 0) < 0) {
 243                 wpa_printf(MSG_DEBUG, "%s: Failed to remove PAE multicast "
 244                            "group (SIOCDELMULTI)", __func__);
 245         }
 246
 247         if (drv->iff_allmulti &&
 248             (wpa_driver_wired_get_ifflags(drv->ifname, &flags) < 0 ||
 249              wpa_driver_wired_set_ifflags(drv->ifname,
 250                                           flags & ~IFF_ALLMULTI) < 0)) {
 251                 wpa_printf(MSG_DEBUG, "%s: Failed to disable allmulti mode",
 252                            __func__);
 253         }
 254
 255         if (drv->iff_up &&
 256             wpa_driver_wired_get_ifflags(drv->ifname, &flags) == 0 &&
 257             (flags & IFF_UP) &&
 258             wpa_driver_wired_set_ifflags(drv->ifname, flags & ~IFF_UP) < 0) {
 259                 wpa_printf(MSG_DEBUG, "%s: Failed to set the interface down",
 260                            __func__);
 261         }
 262
 263         if (drv->pf_sock != -1)
 264                 close(drv->pf_sock);
 265
 266         os_free(drv);
 267 }
 268
 269
 270 const struct wpa_driver_ops wpa_driver_wired_ops = {
 271         .name = "wired",
 272         .desc = "wpa_supplicant wired Ethernet driver",
 273         .get_ssid = wpa_driver_wired_get_ssid,
 274         .get_bssid = wpa_driver_wired_get_bssid,
 275         .init = wpa_driver_wired_init,
 276         .deinit = wpa_driver_wired_deinit,
 277 };