contrib/hostapd/src/l2_packet/l2_packet_freebsd.c

   1 /*
   2  * WPA Supplicant - Layer2 packet handling with FreeBSD
   3  * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
   4  * Copyright (c) 2005, Sam Leffler <sam@errno.com>
   5  *
   6  * This software may be distributed under the terms of the BSD license.
   7  * See README for more details.
   8  */
   9
  10 #include "includes.h"
  11 #if defined(__APPLE__) || defined(__GLIBC__)
  12 #include <net/bpf.h>
  13 #endif /* __APPLE__ */
  14 #include <pcap.h>
  15
  16 #include <sys/ioctl.h>
  17 #ifdef __sun__
  18 #include <libdlpi.h>
  19 #else /* __sun__ */
  20 #include <sys/sysctl.h>
  21 #endif /* __sun__ */
  22
  23 #include <net/if.h>
  24 #include <net/if_dl.h>
  25 #include <net/route.h>
  26 #include <netinet/in.h>
  27
  28 #include "common.h"
  29 #include "eloop.h"
  30 #include "l2_packet.h"
  31
  32
  33 static const u8 pae_group_addr[ETH_ALEN] =
  34 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };
  35
  36 struct l2_packet_data {
  37         pcap_t *pcap;
  38         char ifname[100];
  39         u8 own_addr[ETH_ALEN];
  40         void (*rx_callback)(void *ctx, const u8 *src_addr,
  41                             const u8 *buf, size_t len);
  42         void *rx_callback_ctx;
  43         int l2_hdr; /* whether to include layer 2 (Ethernet) header data
  44                      * buffers */
  45 };
  46
  47
  48 int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
  49 {
  50         os_memcpy(addr, l2->own_addr, ETH_ALEN);
  51         return 0;
  52 }
  53
  54
  55 int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
  56                    const u8 *buf, size_t len)
  57 {
  58         if (!l2->l2_hdr) {
  59                 int ret;
  60                 struct l2_ethhdr *eth = os_malloc(sizeof(*eth) + len);
  61                 if (eth == NULL)
  62                         return -1;
  63                 os_memcpy(eth->h_dest, dst_addr, ETH_ALEN);
  64                 os_memcpy(eth->h_source, l2->own_addr, ETH_ALEN);
  65                 eth->h_proto = htons(proto);
  66                 os_memcpy(eth + 1, buf, len);
  67                 ret = pcap_inject(l2->pcap, (u8 *) eth, len + sizeof(*eth));
  68                 os_free(eth);
  69                 return ret;
  70         } else
  71                 return pcap_inject(l2->pcap, buf, len);
  72 }
  73
  74
  75 static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
  76 {
  77         struct l2_packet_data *l2 = eloop_ctx;
  78         pcap_t *pcap = sock_ctx;
  79         struct pcap_pkthdr hdr;
  80         const u_char *packet;
  81         struct l2_ethhdr *ethhdr;
  82         unsigned char *buf;
  83         size_t len;
  84
  85         packet = pcap_next(pcap, &hdr);
  86
  87         if (packet == NULL || hdr.caplen < sizeof(*ethhdr))
  88                 return;
  89
  90         ethhdr = (struct l2_ethhdr *) packet;
  91         if (l2->l2_hdr) {
  92                 buf = (unsigned char *) ethhdr;
  93                 len = hdr.caplen;
  94         } else {
  95                 buf = (unsigned char *) (ethhdr + 1);
  96                 len = hdr.caplen - sizeof(*ethhdr);
  97         }
  98         l2->rx_callback(l2->rx_callback_ctx, ethhdr->h_source, buf, len);
  99 }
 100
 101
 102 static int l2_packet_init_libpcap(struct l2_packet_data *l2,
 103                                   unsigned short protocol)
 104 {
 105         bpf_u_int32 pcap_maskp, pcap_netp;
 106         char pcap_filter[200], pcap_err[PCAP_ERRBUF_SIZE];
 107         struct bpf_program pcap_fp;
 108
 109         pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
 110         l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 10, pcap_err);
 111         if (l2->pcap == NULL) {
 112                 fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
 113                 fprintf(stderr, "ifname='%s'\n", l2->ifname);
 114                 return -1;
 115         }
 116         if (pcap_datalink(l2->pcap) != DLT_EN10MB &&
 117             pcap_set_datalink(l2->pcap, DLT_EN10MB) < 0) {
 118                 fprintf(stderr, "pcap_set_datalink(DLT_EN10MB): %s\n",
 119                         pcap_geterr(l2->pcap));
 120                 return -1;
 121         }
 122         os_snprintf(pcap_filter, sizeof(pcap_filter),
 123                     "not ether src " MACSTR " and "
 124                     "( ether dst " MACSTR " or ether dst " MACSTR " ) and "
 125                     "ether proto 0x%x",
 126                     MAC2STR(l2->own_addr), /* do not receive own packets */
 127                     MAC2STR(l2->own_addr), MAC2STR(pae_group_addr),
 128                     protocol);
 129         if (pcap_compile(l2->pcap, &pcap_fp, pcap_filter, 1, pcap_netp) < 0) {
 130                 fprintf(stderr, "pcap_compile: %s\n", pcap_geterr(l2->pcap));
 131                 return -1;
 132         }
 133
 134         if (pcap_setfilter(l2->pcap, &pcap_fp) < 0) {
 135                 fprintf(stderr, "pcap_setfilter: %s\n", pcap_geterr(l2->pcap));
 136                 return -1;
 137         }
 138
 139         pcap_freecode(&pcap_fp);
 140 #ifndef __sun__
 141         /*
 142          * When libpcap uses BPF we must enable "immediate mode" to
 143          * receive frames right away; otherwise the system may
 144          * buffer them for us.
 145          */
 146         {
 147                 unsigned int on = 1;
 148                 if (ioctl(pcap_fileno(l2->pcap), BIOCIMMEDIATE, &on) < 0) {
 149                         fprintf(stderr, "%s: cannot enable immediate mode on "
 150                                 "interface %s: %s\n",
 151                                 __func__, l2->ifname, strerror(errno));
 152                         /* XXX should we fail? */
 153                 }
 154         }
 155 #endif /* __sun__ */
 156
 157         eloop_register_read_sock(pcap_get_selectable_fd(l2->pcap),
 158                                  l2_packet_receive, l2, l2->pcap);
 159
 160         return 0;
 161 }
 162
 163
 164 static int eth_get(const char *device, u8 ea[ETH_ALEN])
 165 {
 166 #ifdef __sun__
 167         dlpi_handle_t dh;
 168         u32 physaddrlen = DLPI_PHYSADDR_MAX;
 169         u8 physaddr[DLPI_PHYSADDR_MAX];
 170         int retval;
 171
 172         retval = dlpi_open(device, &dh, 0);
 173         if (retval != DLPI_SUCCESS) {
 174                 wpa_printf(MSG_ERROR, "dlpi_open error: %s",
 175                            dlpi_strerror(retval));
 176                 return -1;
 177         }
 178
 179         retval = dlpi_get_physaddr(dh, DL_CURR_PHYS_ADDR, physaddr,
 180                                    &physaddrlen);
 181         if (retval != DLPI_SUCCESS) {
 182                 wpa_printf(MSG_ERROR, "dlpi_get_physaddr error: %s",
 183                            dlpi_strerror(retval));
 184                 dlpi_close(dh);
 185                 return -1;
 186         }
 187         os_memcpy(ea, physaddr, ETH_ALEN);
 188         dlpi_close(dh);
 189 #else /* __sun__ */
 190         struct if_msghdr *ifm;
 191         struct sockaddr_dl *sdl;
 192         u_char *p, *buf;
 193         size_t len;
 194         int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
 195
 196         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 197                 return -1;
 198         if ((buf = os_malloc(len)) == NULL)
 199                 return -1;
 200         if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 201                 os_free(buf);
 202                 return -1;
 203         }
 204         for (p = buf; p < buf + len; p += ifm->ifm_msglen) {
 205                 ifm = (struct if_msghdr *)p;
 206                 sdl = (struct sockaddr_dl *)(ifm + 1);
 207                 if (ifm->ifm_type != RTM_IFINFO ||
 208                     (ifm->ifm_addrs & RTA_IFP) == 0)
 209                         continue;
 210                 if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
 211                     os_memcmp(sdl->sdl_data, device, sdl->sdl_nlen) != 0)
 212                         continue;
 213                 os_memcpy(ea, LLADDR(sdl), sdl->sdl_alen);
 214                 break;
 215         }
 216         os_free(buf);
 217
 218         if (p >= buf + len) {
 219                 errno = ESRCH;
 220                 return -1;
 221         }
 222 #endif /* __sun__ */
 223         return 0;
 224 }
 225
 226
 227 struct l2_packet_data * l2_packet_init(
 228         const char *ifname, const u8 *own_addr, unsigned short protocol,
 229         void (*rx_callback)(void *ctx, const u8 *src_addr,
 230                             const u8 *buf, size_t len),
 231         void *rx_callback_ctx, int l2_hdr)
 232 {
 233         struct l2_packet_data *l2;
 234
 235         l2 = os_zalloc(sizeof(struct l2_packet_data));
 236         if (l2 == NULL)
 237                 return NULL;
 238         os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
 239         l2->rx_callback = rx_callback;
 240         l2->rx_callback_ctx = rx_callback_ctx;
 241         l2->l2_hdr = l2_hdr;
 242
 243         if (eth_get(l2->ifname, l2->own_addr) < 0) {
 244                 fprintf(stderr, "Failed to get link-level address for "
 245                         "interface '%s'.\n", l2->ifname);
 246                 os_free(l2);
 247                 return NULL;
 248         }
 249
 250         if (l2_packet_init_libpcap(l2, protocol)) {
 251                 os_free(l2);
 252                 return NULL;
 253         }
 254
 255         return l2;
 256 }
 257
 258
 259 void l2_packet_deinit(struct l2_packet_data *l2)
 260 {
 261         if (l2 != NULL) {
 262                 if (l2->pcap) {
 263                         eloop_unregister_read_sock(
 264                                 pcap_get_selectable_fd(l2->pcap));
 265                         pcap_close(l2->pcap);
 266                 }
 267                 os_free(l2);
 268         }
 269 }
 270
 271
 272 int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
 273 {
 274         pcap_if_t *devs, *dev;
 275         struct pcap_addr *addr;
 276         struct sockaddr_in *saddr;
 277         int found = 0;
 278         char err[PCAP_ERRBUF_SIZE + 1];
 279
 280         if (pcap_findalldevs(&devs, err) < 0) {
 281                 wpa_printf(MSG_DEBUG, "pcap_findalldevs: %s\n", err);
 282                 return -1;
 283         }
 284
 285         for (dev = devs; dev && !found; dev = dev->next) {
 286                 if (os_strcmp(dev->name, l2->ifname) != 0)
 287                         continue;
 288
 289                 addr = dev->addresses;
 290                 while (addr) {
 291                         saddr = (struct sockaddr_in *) addr->addr;
 292                         if (saddr && saddr->sin_family == AF_INET) {
 293                                 os_strlcpy(buf, inet_ntoa(saddr->sin_addr),
 294                                            len);
 295                                 found = 1;
 296                                 break;
 297                         }
 298                         addr = addr->next;
 299                 }
 300         }
 301
 302         pcap_freealldevs(devs);
 303
 304         return found ? 0 : -1;
 305 }
 306
 307
 308 void l2_packet_notify_auth_start(struct l2_packet_data *l2)
 309 {
 310 }