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 software may be distributed under the terms of the BSD license.
7 * See README for more details.
8 */
9
10 #include "includes.h"
11
12 #include "common.h"
13 #include "eloop.h"
14 #include "driver.h"
15 #include "driver_wired_common.h"
16
17 #include <sys/ioctl.h>
18 #undef IFNAMSIZ
19 #include <net/if.h>
20 #ifdef __linux__
21 #include <netpacket/packet.h>
22 #include <net/if_arp.h>
23 #endif /* __linux__ */
24 #if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
25 #include <net/if_dl.h>
26 #include <net/if_media.h>
27 #endif /* defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__) */
28 #ifdef __sun__
29 #include <sys/sockio.h>
30 #endif /* __sun__ */
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
47 struct wpa_driver_wired_data {
48 struct driver_wired_common_data common;
49
50 int dhcp_sock; /* socket for dhcp packets */
51 int use_pae_group_addr;
52 };
53
54
55 /* TODO: detecting new devices should eventually be changed from using DHCP
56 * snooping to trigger on any packet from a new layer 2 MAC address, e.g.,
57 * based on ebtables, etc. */
58
59 struct dhcp_message {
60 u_int8_t op;
61 u_int8_t htype;
62 u_int8_t hlen;
63 u_int8_t hops;
64 u_int32_t xid;
65 u_int16_t secs;
66 u_int16_t flags;
67 u_int32_t ciaddr;
68 u_int32_t yiaddr;
69 u_int32_t siaddr;
70 u_int32_t giaddr;
71 u_int8_t chaddr[16];
72 u_int8_t sname[64];
73 u_int8_t file[128];
74 u_int32_t cookie;
75 u_int8_t options[308]; /* 312 - cookie */
76 };
77
78
79 #ifdef __linux__
handle_data(void * ctx,unsigned char * buf,size_t len)80 static void handle_data(void *ctx, unsigned char *buf, size_t len)
81 {
82 #ifdef HOSTAPD
83 struct ieee8023_hdr *hdr;
84 u8 *pos, *sa;
85 size_t left;
86 union wpa_event_data event;
87
88 /* must contain at least ieee8023_hdr 6 byte source, 6 byte dest,
89 * 2 byte ethertype */
90 if (len < 14) {
91 wpa_printf(MSG_MSGDUMP, "handle_data: too short (%lu)",
92 (unsigned long) len);
93 return;
94 }
95
96 hdr = (struct ieee8023_hdr *) buf;
97
98 switch (ntohs(hdr->ethertype)) {
99 case ETH_P_PAE:
100 wpa_printf(MSG_MSGDUMP, "Received EAPOL packet");
101 sa = hdr->src;
102 os_memset(&event, 0, sizeof(event));
103 event.new_sta.addr = sa;
104 wpa_supplicant_event(ctx, EVENT_NEW_STA, &event);
105
106 pos = (u8 *) (hdr + 1);
107 left = len - sizeof(*hdr);
108 drv_event_eapol_rx(ctx, sa, pos, left);
109 break;
110
111 default:
112 wpa_printf(MSG_DEBUG, "Unknown ethertype 0x%04x in data frame",
113 ntohs(hdr->ethertype));
114 break;
115 }
116 #endif /* HOSTAPD */
117 }
118
119
handle_read(int sock,void * eloop_ctx,void * sock_ctx)120 static void handle_read(int sock, void *eloop_ctx, void *sock_ctx)
121 {
122 int len;
123 unsigned char buf[3000];
124
125 len = recv(sock, buf, sizeof(buf), 0);
126 if (len < 0) {
127 wpa_printf(MSG_ERROR, "recv: %s", strerror(errno));
128 return;
129 }
130
131 handle_data(eloop_ctx, buf, len);
132 }
133
134
handle_dhcp(int sock,void * eloop_ctx,void * sock_ctx)135 static void handle_dhcp(int sock, void *eloop_ctx, void *sock_ctx)
136 {
137 int len;
138 unsigned char buf[3000];
139 struct dhcp_message *msg;
140 u8 *mac_address;
141 union wpa_event_data event;
142
143 len = recv(sock, buf, sizeof(buf), 0);
144 if (len < 0) {
145 wpa_printf(MSG_ERROR, "recv: %s", strerror(errno));
146 return;
147 }
148
149 /* must contain at least dhcp_message->chaddr */
150 if (len < 44) {
151 wpa_printf(MSG_MSGDUMP, "handle_dhcp: too short (%d)", len);
152 return;
153 }
154
155 msg = (struct dhcp_message *) buf;
156 mac_address = (u8 *) &(msg->chaddr);
157
158 wpa_printf(MSG_MSGDUMP, "Got DHCP broadcast packet from " MACSTR,
159 MAC2STR(mac_address));
160
161 os_memset(&event, 0, sizeof(event));
162 event.new_sta.addr = mac_address;
163 wpa_supplicant_event(eloop_ctx, EVENT_NEW_STA, &event);
164 }
165 #endif /* __linux__ */
166
167
wired_init_sockets(struct wpa_driver_wired_data * drv,u8 * own_addr)168 static int wired_init_sockets(struct wpa_driver_wired_data *drv, u8 *own_addr)
169 {
170 #ifdef __linux__
171 struct ifreq ifr;
172 struct sockaddr_ll addr;
173 struct sockaddr_in addr2;
174 int n = 1;
175
176 drv->common.sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_PAE));
177 if (drv->common.sock < 0) {
178 wpa_printf(MSG_ERROR, "socket[PF_PACKET,SOCK_RAW]: %s",
179 strerror(errno));
180 return -1;
181 }
182
183 if (eloop_register_read_sock(drv->common.sock, handle_read,
184 drv->common.ctx, NULL)) {
185 wpa_printf(MSG_INFO, "Could not register read socket");
186 return -1;
187 }
188
189 os_memset(&ifr, 0, sizeof(ifr));
190 os_strlcpy(ifr.ifr_name, drv->common.ifname, sizeof(ifr.ifr_name));
191 if (ioctl(drv->common.sock, SIOCGIFINDEX, &ifr) != 0) {
192 wpa_printf(MSG_ERROR, "ioctl(SIOCGIFINDEX): %s",
193 strerror(errno));
194 return -1;
195 }
196
197 os_memset(&addr, 0, sizeof(addr));
198 addr.sll_family = AF_PACKET;
199 addr.sll_ifindex = ifr.ifr_ifindex;
200 wpa_printf(MSG_DEBUG, "Opening raw packet socket for ifindex %d",
201 addr.sll_ifindex);
202
203 if (bind(drv->common.sock, (struct sockaddr *) &addr, sizeof(addr)) < 0)
204 {
205 wpa_printf(MSG_ERROR, "bind: %s", strerror(errno));
206 return -1;
207 }
208
209 /* filter multicast address */
210 if (wired_multicast_membership(drv->common.sock, ifr.ifr_ifindex,
211 pae_group_addr, 1) < 0) {
212 wpa_printf(MSG_ERROR, "wired: Failed to add multicast group "
213 "membership");
214 return -1;
215 }
216
217 os_memset(&ifr, 0, sizeof(ifr));
218 os_strlcpy(ifr.ifr_name, drv->common.ifname, sizeof(ifr.ifr_name));
219 if (ioctl(drv->common.sock, SIOCGIFHWADDR, &ifr) != 0) {
220 wpa_printf(MSG_ERROR, "ioctl(SIOCGIFHWADDR): %s",
221 strerror(errno));
222 return -1;
223 }
224
225 if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
226 wpa_printf(MSG_INFO, "Invalid HW-addr family 0x%04x",
227 ifr.ifr_hwaddr.sa_family);
228 return -1;
229 }
230 os_memcpy(own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
231
232 /* setup dhcp listen socket for sta detection */
233 if ((drv->dhcp_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
234 wpa_printf(MSG_ERROR, "socket call failed for dhcp: %s",
235 strerror(errno));
236 return -1;
237 }
238
239 if (eloop_register_read_sock(drv->dhcp_sock, handle_dhcp,
240 drv->common.ctx, NULL)) {
241 wpa_printf(MSG_INFO, "Could not register read socket");
242 return -1;
243 }
244
245 os_memset(&addr2, 0, sizeof(addr2));
246 addr2.sin_family = AF_INET;
247 addr2.sin_port = htons(67);
248 addr2.sin_addr.s_addr = INADDR_ANY;
249
250 if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_REUSEADDR, (char *) &n,
251 sizeof(n)) == -1) {
252 wpa_printf(MSG_ERROR, "setsockopt[SOL_SOCKET,SO_REUSEADDR]: %s",
253 strerror(errno));
254 return -1;
255 }
256 if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_BROADCAST, (char *) &n,
257 sizeof(n)) == -1) {
258 wpa_printf(MSG_ERROR, "setsockopt[SOL_SOCKET,SO_BROADCAST]: %s",
259 strerror(errno));
260 return -1;
261 }
262
263 os_memset(&ifr, 0, sizeof(ifr));
264 os_strlcpy(ifr.ifr_ifrn.ifrn_name, drv->common.ifname, IFNAMSIZ);
265 if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_BINDTODEVICE,
266 (char *) &ifr, sizeof(ifr)) < 0) {
267 wpa_printf(MSG_ERROR,
268 "setsockopt[SOL_SOCKET,SO_BINDTODEVICE]: %s",
269 strerror(errno));
270 return -1;
271 }
272
273 if (bind(drv->dhcp_sock, (struct sockaddr *) &addr2,
274 sizeof(struct sockaddr)) == -1) {
275 wpa_printf(MSG_ERROR, "bind: %s", strerror(errno));
276 return -1;
277 }
278
279 return 0;
280 #else /* __linux__ */
281 return -1;
282 #endif /* __linux__ */
283 }
284
285
wired_send_eapol(void * priv,const u8 * addr,const u8 * data,size_t data_len,int encrypt,const u8 * own_addr,u32 flags)286 static int wired_send_eapol(void *priv, const u8 *addr,
287 const u8 *data, size_t data_len, int encrypt,
288 const u8 *own_addr, u32 flags)
289 {
290 struct wpa_driver_wired_data *drv = priv;
291 struct ieee8023_hdr *hdr;
292 size_t len;
293 u8 *pos;
294 int res;
295
296 len = sizeof(*hdr) + data_len;
297 hdr = os_zalloc(len);
298 if (hdr == NULL) {
299 wpa_printf(MSG_INFO,
300 "malloc() failed for wired_send_eapol(len=%lu)",
301 (unsigned long) len);
302 return -1;
303 }
304
305 os_memcpy(hdr->dest, drv->use_pae_group_addr ? pae_group_addr : addr,
306 ETH_ALEN);
307 os_memcpy(hdr->src, own_addr, ETH_ALEN);
308 hdr->ethertype = htons(ETH_P_PAE);
309
310 pos = (u8 *) (hdr + 1);
311 os_memcpy(pos, data, data_len);
312
313 res = send(drv->common.sock, (u8 *) hdr, len, 0);
314 os_free(hdr);
315
316 if (res < 0) {
317 wpa_printf(MSG_ERROR,
318 "wired_send_eapol - packet len: %lu - failed: send: %s",
319 (unsigned long) len, strerror(errno));
320 }
321
322 return res;
323 }
324
325
wired_driver_hapd_init(struct hostapd_data * hapd,struct wpa_init_params * params)326 static void * wired_driver_hapd_init(struct hostapd_data *hapd,
327 struct wpa_init_params *params)
328 {
329 struct wpa_driver_wired_data *drv;
330
331 drv = os_zalloc(sizeof(struct wpa_driver_wired_data));
332 if (drv == NULL) {
333 wpa_printf(MSG_INFO,
334 "Could not allocate memory for wired driver data");
335 return NULL;
336 }
337
338 drv->common.ctx = hapd;
339 os_strlcpy(drv->common.ifname, params->ifname,
340 sizeof(drv->common.ifname));
341 drv->use_pae_group_addr = params->use_pae_group_addr;
342
343 if (wired_init_sockets(drv, params->own_addr)) {
344 os_free(drv);
345 return NULL;
346 }
347
348 return drv;
349 }
350
351
wired_driver_hapd_deinit(void * priv)352 static void wired_driver_hapd_deinit(void *priv)
353 {
354 struct wpa_driver_wired_data *drv = priv;
355
356 if (drv->common.sock >= 0) {
357 eloop_unregister_read_sock(drv->common.sock);
358 close(drv->common.sock);
359 }
360
361 if (drv->dhcp_sock >= 0) {
362 eloop_unregister_read_sock(drv->dhcp_sock);
363 close(drv->dhcp_sock);
364 }
365
366 os_free(drv);
367 }
368
369
wpa_driver_wired_init(void * ctx,const char * ifname)370 static void * wpa_driver_wired_init(void *ctx, const char *ifname)
371 {
372 struct wpa_driver_wired_data *drv;
373
374 drv = os_zalloc(sizeof(*drv));
375 if (drv == NULL)
376 return NULL;
377
378 if (driver_wired_init_common(&drv->common, ifname, ctx) < 0) {
379 os_free(drv);
380 return NULL;
381 }
382
383 return drv;
384 }
385
386
wpa_driver_wired_deinit(void * priv)387 static void wpa_driver_wired_deinit(void *priv)
388 {
389 struct wpa_driver_wired_data *drv = priv;
390
391 driver_wired_deinit_common(&drv->common);
392 os_free(drv);
393 }
394
395
396 const struct wpa_driver_ops wpa_driver_wired_ops = {
397 .name = "wired",
398 .desc = "Wired Ethernet driver",
399 .hapd_init = wired_driver_hapd_init,
400 .hapd_deinit = wired_driver_hapd_deinit,
401 .hapd_send_eapol = wired_send_eapol,
402 .get_ssid = driver_wired_get_ssid,
403 .get_bssid = driver_wired_get_bssid,
404 .get_capa = driver_wired_get_capa,
405 .init = wpa_driver_wired_init,
406 .deinit = wpa_driver_wired_deinit,
407 };
408