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-rw-r--r--src/l2_packet/l2_packet_freebsd.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/src/l2_packet/l2_packet_freebsd.c b/src/l2_packet/l2_packet_freebsd.c
new file mode 100644
index 0000000..d1034aa
--- /dev/null
+++ b/src/l2_packet/l2_packet_freebsd.c
@@ -0,0 +1,285 @@
+/*
+ * WPA Supplicant - Layer2 packet handling with FreeBSD
+ * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2005, Sam Leffler <sam@errno.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+#ifdef __APPLE__
+#include <net/bpf.h>
+#endif /* __APPLE__ */
+#include <pcap.h>
+
+#include <sys/ioctl.h>
+#include <sys/sysctl.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/route.h>
+#include <netinet/in.h>
+
+#include "common.h"
+#include "eloop.h"
+#include "l2_packet.h"
+
+
+static const u8 pae_group_addr[ETH_ALEN] =
+{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };
+
+struct l2_packet_data {
+ pcap_t *pcap;
+ char ifname[100];
+ u8 own_addr[ETH_ALEN];
+ void (*rx_callback)(void *ctx, const u8 *src_addr,
+ const u8 *buf, size_t len);
+ void *rx_callback_ctx;
+ int l2_hdr; /* whether to include layer 2 (Ethernet) header data
+ * buffers */
+};
+
+
+int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
+{
+ os_memcpy(addr, l2->own_addr, ETH_ALEN);
+ return 0;
+}
+
+
+int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
+ const u8 *buf, size_t len)
+{
+ if (!l2->l2_hdr) {
+ int ret;
+ struct l2_ethhdr *eth = os_malloc(sizeof(*eth) + len);
+ if (eth == NULL)
+ return -1;
+ os_memcpy(eth->h_dest, dst_addr, ETH_ALEN);
+ os_memcpy(eth->h_source, l2->own_addr, ETH_ALEN);
+ eth->h_proto = htons(proto);
+ os_memcpy(eth + 1, buf, len);
+ ret = pcap_inject(l2->pcap, (u8 *) eth, len + sizeof(*eth));
+ os_free(eth);
+ return ret;
+ } else
+ return pcap_inject(l2->pcap, buf, len);
+}
+
+
+static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
+{
+ struct l2_packet_data *l2 = eloop_ctx;
+ pcap_t *pcap = sock_ctx;
+ struct pcap_pkthdr hdr;
+ const u_char *packet;
+ struct l2_ethhdr *ethhdr;
+ unsigned char *buf;
+ size_t len;
+
+ packet = pcap_next(pcap, &hdr);
+
+ if (packet == NULL || hdr.caplen < sizeof(*ethhdr))
+ return;
+
+ ethhdr = (struct l2_ethhdr *) packet;
+ if (l2->l2_hdr) {
+ buf = (unsigned char *) ethhdr;
+ len = hdr.caplen;
+ } else {
+ buf = (unsigned char *) (ethhdr + 1);
+ len = hdr.caplen - sizeof(*ethhdr);
+ }
+ l2->rx_callback(l2->rx_callback_ctx, ethhdr->h_source, buf, len);
+}
+
+
+static int l2_packet_init_libpcap(struct l2_packet_data *l2,
+ unsigned short protocol)
+{
+ bpf_u_int32 pcap_maskp, pcap_netp;
+ char pcap_filter[200], pcap_err[PCAP_ERRBUF_SIZE];
+ struct bpf_program pcap_fp;
+
+ pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
+ l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 10, pcap_err);
+ if (l2->pcap == NULL) {
+ fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
+ fprintf(stderr, "ifname='%s'\n", l2->ifname);
+ return -1;
+ }
+ if (pcap_datalink(l2->pcap) != DLT_EN10MB &&
+ pcap_set_datalink(l2->pcap, DLT_EN10MB) < 0) {
+ fprintf(stderr, "pcap_set_datalink(DLT_EN10MB): %s\n",
+ pcap_geterr(l2->pcap));
+ return -1;
+ }
+ os_snprintf(pcap_filter, sizeof(pcap_filter),
+ "not ether src " MACSTR " and "
+ "( ether dst " MACSTR " or ether dst " MACSTR " ) and "
+ "ether proto 0x%x",
+ MAC2STR(l2->own_addr), /* do not receive own packets */
+ MAC2STR(l2->own_addr), MAC2STR(pae_group_addr),
+ protocol);
+ if (pcap_compile(l2->pcap, &pcap_fp, pcap_filter, 1, pcap_netp) < 0) {
+ fprintf(stderr, "pcap_compile: %s\n", pcap_geterr(l2->pcap));
+ return -1;
+ }
+
+ if (pcap_setfilter(l2->pcap, &pcap_fp) < 0) {
+ fprintf(stderr, "pcap_setfilter: %s\n", pcap_geterr(l2->pcap));
+ return -1;
+ }
+
+ pcap_freecode(&pcap_fp);
+ /*
+ * When libpcap uses BPF we must enable "immediate mode" to
+ * receive frames right away; otherwise the system may
+ * buffer them for us.
+ */
+ {
+ unsigned int on = 1;
+ if (ioctl(pcap_fileno(l2->pcap), BIOCIMMEDIATE, &on) < 0) {
+ fprintf(stderr, "%s: cannot enable immediate mode on "
+ "interface %s: %s\n",
+ __func__, l2->ifname, strerror(errno));
+ /* XXX should we fail? */
+ }
+ }
+
+ eloop_register_read_sock(pcap_get_selectable_fd(l2->pcap),
+ l2_packet_receive, l2, l2->pcap);
+
+ return 0;
+}
+
+
+static int eth_get(const char *device, u8 ea[ETH_ALEN])
+{
+ struct if_msghdr *ifm;
+ struct sockaddr_dl *sdl;
+ u_char *p, *buf;
+ size_t len;
+ int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
+
+ if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
+ return -1;
+ if ((buf = os_malloc(len)) == NULL)
+ return -1;
+ if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
+ os_free(buf);
+ return -1;
+ }
+ for (p = buf; p < buf + len; p += ifm->ifm_msglen) {
+ ifm = (struct if_msghdr *)p;
+ sdl = (struct sockaddr_dl *)(ifm + 1);
+ if (ifm->ifm_type != RTM_IFINFO ||
+ (ifm->ifm_addrs & RTA_IFP) == 0)
+ continue;
+ if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
+ os_memcmp(sdl->sdl_data, device, sdl->sdl_nlen) != 0)
+ continue;
+ os_memcpy(ea, LLADDR(sdl), sdl->sdl_alen);
+ break;
+ }
+ os_free(buf);
+
+ if (p >= buf + len) {
+ errno = ESRCH;
+ return -1;
+ }
+ return 0;
+}
+
+
+struct l2_packet_data * l2_packet_init(
+ const char *ifname, const u8 *own_addr, unsigned short protocol,
+ void (*rx_callback)(void *ctx, const u8 *src_addr,
+ const u8 *buf, size_t len),
+ void *rx_callback_ctx, int l2_hdr)
+{
+ struct l2_packet_data *l2;
+
+ l2 = os_zalloc(sizeof(struct l2_packet_data));
+ if (l2 == NULL)
+ return NULL;
+ os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
+ l2->rx_callback = rx_callback;
+ l2->rx_callback_ctx = rx_callback_ctx;
+ l2->l2_hdr = l2_hdr;
+
+ if (eth_get(l2->ifname, l2->own_addr) < 0) {
+ fprintf(stderr, "Failed to get link-level address for "
+ "interface '%s'.\n", l2->ifname);
+ os_free(l2);
+ return NULL;
+ }
+
+ if (l2_packet_init_libpcap(l2, protocol)) {
+ os_free(l2);
+ return NULL;
+ }
+
+ return l2;
+}
+
+
+void l2_packet_deinit(struct l2_packet_data *l2)
+{
+ if (l2 != NULL) {
+ if (l2->pcap) {
+ eloop_unregister_read_sock(
+ pcap_get_selectable_fd(l2->pcap));
+ pcap_close(l2->pcap);
+ }
+ os_free(l2);
+ }
+}
+
+
+int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
+{
+ pcap_if_t *devs, *dev;
+ struct pcap_addr *addr;
+ struct sockaddr_in *saddr;
+ int found = 0;
+ char err[PCAP_ERRBUF_SIZE + 1];
+
+ if (pcap_findalldevs(&devs, err) < 0) {
+ wpa_printf(MSG_DEBUG, "pcap_findalldevs: %s\n", err);
+ return -1;
+ }
+
+ for (dev = devs; dev && !found; dev = dev->next) {
+ if (os_strcmp(dev->name, l2->ifname) != 0)
+ continue;
+
+ addr = dev->addresses;
+ while (addr) {
+ saddr = (struct sockaddr_in *) addr->addr;
+ if (saddr && saddr->sin_family == AF_INET) {
+ os_strlcpy(buf, inet_ntoa(saddr->sin_addr),
+ len);
+ found = 1;
+ break;
+ }
+ addr = addr->next;
+ }
+ }
+
+ pcap_freealldevs(devs);
+
+ return found ? 0 : -1;
+}
+
+
+void l2_packet_notify_auth_start(struct l2_packet_data *l2)
+{
+}