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>
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.
10 * Alternatively, this software may be distributed under the terms of BSD
13 * See README and COPYING for more details.
17 #if defined(__APPLE__) || defined(__GLIBC__)
19 #endif /* __APPLE__ */
22 #include <sys/ioctl.h>
26 #include <sys/sysctl.h>
30 #include <net/if_dl.h>
31 #include <net/route.h>
32 #include <netinet/in.h>
36 #include "l2_packet.h"
39 static const u8 pae_group_addr[ETH_ALEN] =
40 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };
42 struct l2_packet_data {
45 u8 own_addr[ETH_ALEN];
46 void (*rx_callback)(void *ctx, const u8 *src_addr,
47 const u8 *buf, size_t len);
48 void *rx_callback_ctx;
49 int l2_hdr; /* whether to include layer 2 (Ethernet) header data
54 int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
56 os_memcpy(addr, l2->own_addr, ETH_ALEN);
61 int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
62 const u8 *buf, size_t len)
66 struct l2_ethhdr *eth = os_malloc(sizeof(*eth) + len);
69 os_memcpy(eth->h_dest, dst_addr, ETH_ALEN);
70 os_memcpy(eth->h_source, l2->own_addr, ETH_ALEN);
71 eth->h_proto = htons(proto);
72 os_memcpy(eth + 1, buf, len);
73 ret = pcap_inject(l2->pcap, (u8 *) eth, len + sizeof(*eth));
77 return pcap_inject(l2->pcap, buf, len);
81 static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
83 struct l2_packet_data *l2 = eloop_ctx;
84 pcap_t *pcap = sock_ctx;
85 struct pcap_pkthdr hdr;
87 struct l2_ethhdr *ethhdr;
91 packet = pcap_next(pcap, &hdr);
93 if (packet == NULL || hdr.caplen < sizeof(*ethhdr))
96 ethhdr = (struct l2_ethhdr *) packet;
98 buf = (unsigned char *) ethhdr;
101 buf = (unsigned char *) (ethhdr + 1);
102 len = hdr.caplen - sizeof(*ethhdr);
104 l2->rx_callback(l2->rx_callback_ctx, ethhdr->h_source, buf, len);
108 static int l2_packet_init_libpcap(struct l2_packet_data *l2,
109 unsigned short protocol)
111 bpf_u_int32 pcap_maskp, pcap_netp;
112 char pcap_filter[200], pcap_err[PCAP_ERRBUF_SIZE];
113 struct bpf_program pcap_fp;
115 pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
116 l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 10, pcap_err);
117 if (l2->pcap == NULL) {
118 fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
119 fprintf(stderr, "ifname='%s'\n", l2->ifname);
122 if (pcap_datalink(l2->pcap) != DLT_EN10MB &&
123 pcap_set_datalink(l2->pcap, DLT_EN10MB) < 0) {
124 fprintf(stderr, "pcap_set_datalink(DLT_EN10MB): %s\n",
125 pcap_geterr(l2->pcap));
128 os_snprintf(pcap_filter, sizeof(pcap_filter),
129 "not ether src " MACSTR " and "
130 "( ether dst " MACSTR " or ether dst " MACSTR " ) and "
132 MAC2STR(l2->own_addr), /* do not receive own packets */
133 MAC2STR(l2->own_addr), MAC2STR(pae_group_addr),
135 if (pcap_compile(l2->pcap, &pcap_fp, pcap_filter, 1, pcap_netp) < 0) {
136 fprintf(stderr, "pcap_compile: %s\n", pcap_geterr(l2->pcap));
140 if (pcap_setfilter(l2->pcap, &pcap_fp) < 0) {
141 fprintf(stderr, "pcap_setfilter: %s\n", pcap_geterr(l2->pcap));
145 pcap_freecode(&pcap_fp);
148 * When libpcap uses BPF we must enable "immediate mode" to
149 * receive frames right away; otherwise the system may
150 * buffer them for us.
154 if (ioctl(pcap_fileno(l2->pcap), BIOCIMMEDIATE, &on) < 0) {
155 fprintf(stderr, "%s: cannot enable immediate mode on "
156 "interface %s: %s\n",
157 __func__, l2->ifname, strerror(errno));
158 /* XXX should we fail? */
163 eloop_register_read_sock(pcap_get_selectable_fd(l2->pcap),
164 l2_packet_receive, l2, l2->pcap);
170 static int eth_get(const char *device, u8 ea[ETH_ALEN])
174 u32 physaddrlen = DLPI_PHYSADDR_MAX;
175 u8 physaddr[DLPI_PHYSADDR_MAX];
178 retval = dlpi_open(device, &dh, 0);
179 if (retval != DLPI_SUCCESS) {
180 wpa_printf(MSG_ERROR, "dlpi_open error: %s",
181 dlpi_strerror(retval));
185 retval = dlpi_get_physaddr(dh, DL_CURR_PHYS_ADDR, physaddr,
187 if (retval != DLPI_SUCCESS) {
188 wpa_printf(MSG_ERROR, "dlpi_get_physaddr error: %s",
189 dlpi_strerror(retval));
193 os_memcpy(ea, physaddr, ETH_ALEN);
196 struct if_msghdr *ifm;
197 struct sockaddr_dl *sdl;
200 int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
202 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
204 if ((buf = os_malloc(len)) == NULL)
206 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
210 for (p = buf; p < buf + len; p += ifm->ifm_msglen) {
211 ifm = (struct if_msghdr *)p;
212 sdl = (struct sockaddr_dl *)(ifm + 1);
213 if (ifm->ifm_type != RTM_IFINFO ||
214 (ifm->ifm_addrs & RTA_IFP) == 0)
216 if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
217 os_memcmp(sdl->sdl_data, device, sdl->sdl_nlen) != 0)
219 os_memcpy(ea, LLADDR(sdl), sdl->sdl_alen);
224 if (p >= buf + len) {
233 struct l2_packet_data * l2_packet_init(
234 const char *ifname, const u8 *own_addr, unsigned short protocol,
235 void (*rx_callback)(void *ctx, const u8 *src_addr,
236 const u8 *buf, size_t len),
237 void *rx_callback_ctx, int l2_hdr)
239 struct l2_packet_data *l2;
241 l2 = os_zalloc(sizeof(struct l2_packet_data));
244 os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
245 l2->rx_callback = rx_callback;
246 l2->rx_callback_ctx = rx_callback_ctx;
249 if (eth_get(l2->ifname, l2->own_addr) < 0) {
250 fprintf(stderr, "Failed to get link-level address for "
251 "interface '%s'.\n", l2->ifname);
256 if (l2_packet_init_libpcap(l2, protocol)) {
265 void l2_packet_deinit(struct l2_packet_data *l2)
269 eloop_unregister_read_sock(
270 pcap_get_selectable_fd(l2->pcap));
271 pcap_close(l2->pcap);
278 int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
280 pcap_if_t *devs, *dev;
281 struct pcap_addr *addr;
282 struct sockaddr_in *saddr;
284 char err[PCAP_ERRBUF_SIZE + 1];
286 if (pcap_findalldevs(&devs, err) < 0) {
287 wpa_printf(MSG_DEBUG, "pcap_findalldevs: %s\n", err);
291 for (dev = devs; dev && !found; dev = dev->next) {
292 if (os_strcmp(dev->name, l2->ifname) != 0)
295 addr = dev->addresses;
297 saddr = (struct sockaddr_in *) addr->addr;
298 if (saddr && saddr->sin_family == AF_INET) {
299 os_strlcpy(buf, inet_ntoa(saddr->sin_addr),
308 pcap_freealldevs(devs);
310 return found ? 0 : -1;
314 void l2_packet_notify_auth_start(struct l2_packet_data *l2)