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-rw-r--r--hostapd/driver_wired.c373
1 files changed, 373 insertions, 0 deletions
diff --git a/hostapd/driver_wired.c b/hostapd/driver_wired.c
new file mode 100644
index 0000000..ab97071
--- /dev/null
+++ b/hostapd/driver_wired.c
@@ -0,0 +1,373 @@
+/*
+ * hostapd / Kernel driver communication for wired (Ethernet) drivers
+ * Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004, Gunter Burchardt <tira@isx.de>
+ *
+ * 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"
+#include <sys/ioctl.h>
+
+#ifdef USE_KERNEL_HEADERS
+#include <asm/types.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h> /* The L2 protocols */
+#include <linux/if_arp.h>
+#include <linux/if.h>
+#else /* USE_KERNEL_HEADERS */
+#include <net/if_arp.h>
+#include <net/if.h>
+#include <netpacket/packet.h>
+#endif /* USE_KERNEL_HEADERS */
+
+#include "hostapd.h"
+#include "ieee802_1x.h"
+#include "eloop.h"
+#include "sta_info.h"
+#include "driver.h"
+#include "accounting.h"
+
+
+struct wired_driver_data {
+ struct hostapd_data *hapd;
+
+ int sock; /* raw packet socket for driver access */
+ int dhcp_sock; /* socket for dhcp packets */
+ int use_pae_group_addr;
+};
+
+
+#define WIRED_EAPOL_MULTICAST_GROUP {0x01,0x80,0xc2,0x00,0x00,0x03}
+
+
+/* TODO: detecting new devices should eventually be changed from using DHCP
+ * snooping to trigger on any packet from a new layer 2 MAC address, e.g.,
+ * based on ebtables, etc. */
+
+struct dhcp_message {
+ u_int8_t op;
+ u_int8_t htype;
+ u_int8_t hlen;
+ u_int8_t hops;
+ u_int32_t xid;
+ u_int16_t secs;
+ u_int16_t flags;
+ u_int32_t ciaddr;
+ u_int32_t yiaddr;
+ u_int32_t siaddr;
+ u_int32_t giaddr;
+ u_int8_t chaddr[16];
+ u_int8_t sname[64];
+ u_int8_t file[128];
+ u_int32_t cookie;
+ u_int8_t options[308]; /* 312 - cookie */
+};
+
+
+static void wired_possible_new_sta(struct hostapd_data *hapd, u8 *addr)
+{
+ struct sta_info *sta;
+
+ sta = ap_get_sta(hapd, addr);
+ if (sta)
+ return;
+
+ wpa_printf(MSG_DEBUG, "Data frame from unknown STA " MACSTR
+ " - adding a new STA", MAC2STR(addr));
+ sta = ap_sta_add(hapd, addr);
+ if (sta) {
+ hostapd_new_assoc_sta(hapd, sta, 0);
+ accounting_sta_get_id(hapd, sta);
+ } else {
+ wpa_printf(MSG_DEBUG, "Failed to add STA entry for " MACSTR,
+ MAC2STR(addr));
+ }
+}
+
+
+static void handle_data(struct hostapd_data *hapd, unsigned char *buf,
+ size_t len)
+{
+ struct ieee8023_hdr *hdr;
+ u8 *pos, *sa;
+ size_t left;
+
+ /* must contain at least ieee8023_hdr 6 byte source, 6 byte dest,
+ * 2 byte ethertype */
+ if (len < 14) {
+ wpa_printf(MSG_MSGDUMP, "handle_data: too short (%lu)",
+ (unsigned long) len);
+ return;
+ }
+
+ hdr = (struct ieee8023_hdr *) buf;
+
+ switch (ntohs(hdr->ethertype)) {
+ case ETH_P_PAE:
+ wpa_printf(MSG_MSGDUMP, "Received EAPOL packet");
+ sa = hdr->src;
+ wired_possible_new_sta(hapd, sa);
+
+ pos = (u8 *) (hdr + 1);
+ left = len - sizeof(*hdr);
+
+ ieee802_1x_receive(hapd, sa, pos, left);
+ break;
+
+ default:
+ wpa_printf(MSG_DEBUG, "Unknown ethertype 0x%04x in data frame",
+ ntohs(hdr->ethertype));
+ break;
+ }
+}
+
+
+static void handle_read(int sock, void *eloop_ctx, void *sock_ctx)
+{
+ struct hostapd_data *hapd = (struct hostapd_data *) eloop_ctx;
+ int len;
+ unsigned char buf[3000];
+
+ len = recv(sock, buf, sizeof(buf), 0);
+ if (len < 0) {
+ perror("recv");
+ return;
+ }
+
+ handle_data(hapd, buf, len);
+}
+
+
+static void handle_dhcp(int sock, void *eloop_ctx, void *sock_ctx)
+{
+ struct hostapd_data *hapd = (struct hostapd_data *) eloop_ctx;
+ int len;
+ unsigned char buf[3000];
+ struct dhcp_message *msg;
+ u8 *mac_address;
+
+ len = recv(sock, buf, sizeof(buf), 0);
+ if (len < 0) {
+ perror("recv");
+ return;
+ }
+
+ /* must contain at least dhcp_message->chaddr */
+ if (len < 44) {
+ wpa_printf(MSG_MSGDUMP, "handle_dhcp: too short (%d)", len);
+ return;
+ }
+
+ msg = (struct dhcp_message *) buf;
+ mac_address = (u8 *) &(msg->chaddr);
+
+ wpa_printf(MSG_MSGDUMP, "Got DHCP broadcast packet from " MACSTR,
+ MAC2STR(mac_address));
+
+ wired_possible_new_sta(hapd, mac_address);
+}
+
+
+static int wired_init_sockets(struct wired_driver_data *drv)
+{
+ struct hostapd_data *hapd = drv->hapd;
+ struct ifreq ifr;
+ struct sockaddr_ll addr;
+ struct sockaddr_in addr2;
+ struct packet_mreq mreq;
+ u8 multicastgroup_eapol[6] = WIRED_EAPOL_MULTICAST_GROUP;
+ int n = 1;
+
+ drv->sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_PAE));
+ if (drv->sock < 0) {
+ perror("socket[PF_PACKET,SOCK_RAW]");
+ return -1;
+ }
+
+ if (eloop_register_read_sock(drv->sock, handle_read, hapd, NULL)) {
+ printf("Could not register read socket\n");
+ return -1;
+ }
+
+ memset(&ifr, 0, sizeof(ifr));
+ os_strlcpy(ifr.ifr_name, hapd->conf->iface, sizeof(ifr.ifr_name));
+ if (ioctl(drv->sock, SIOCGIFINDEX, &ifr) != 0) {
+ perror("ioctl(SIOCGIFINDEX)");
+ return -1;
+ }
+
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sll_family = AF_PACKET;
+ addr.sll_ifindex = ifr.ifr_ifindex;
+ wpa_printf(MSG_DEBUG, "Opening raw packet socket for ifindex %d",
+ addr.sll_ifindex);
+
+ if (bind(drv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ perror("bind");
+ return -1;
+ }
+
+ /* filter multicast address */
+ memset(&mreq, 0, sizeof(mreq));
+ mreq.mr_ifindex = ifr.ifr_ifindex;
+ mreq.mr_type = PACKET_MR_MULTICAST;
+ mreq.mr_alen = 6;
+ memcpy(mreq.mr_address, multicastgroup_eapol, mreq.mr_alen);
+
+ if (setsockopt(drv->sock, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq,
+ sizeof(mreq)) < 0) {
+ perror("setsockopt[SOL_SOCKET,PACKET_ADD_MEMBERSHIP]");
+ return -1;
+ }
+
+ memset(&ifr, 0, sizeof(ifr));
+ os_strlcpy(ifr.ifr_name, hapd->conf->iface, sizeof(ifr.ifr_name));
+ if (ioctl(drv->sock, SIOCGIFHWADDR, &ifr) != 0) {
+ perror("ioctl(SIOCGIFHWADDR)");
+ return -1;
+ }
+
+ if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
+ printf("Invalid HW-addr family 0x%04x\n",
+ ifr.ifr_hwaddr.sa_family);
+ return -1;
+ }
+ memcpy(hapd->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
+
+ /* setup dhcp listen socket for sta detection */
+ if ((drv->dhcp_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+ perror("socket call failed for dhcp");
+ return -1;
+ }
+
+ if (eloop_register_read_sock(drv->dhcp_sock, handle_dhcp, hapd, NULL))
+ {
+ printf("Could not register read socket\n");
+ return -1;
+ }
+
+ memset(&addr2, 0, sizeof(addr2));
+ addr2.sin_family = AF_INET;
+ addr2.sin_port = htons(67);
+ addr2.sin_addr.s_addr = INADDR_ANY;
+
+ if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_REUSEADDR, (char *) &n,
+ sizeof(n)) == -1) {
+ perror("setsockopt[SOL_SOCKET,SO_REUSEADDR]");
+ return -1;
+ }
+ if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_BROADCAST, (char *) &n,
+ sizeof(n)) == -1) {
+ perror("setsockopt[SOL_SOCKET,SO_BROADCAST]");
+ return -1;
+ }
+
+ memset(&ifr, 0, sizeof(ifr));
+ os_strlcpy(ifr.ifr_ifrn.ifrn_name, hapd->conf->iface, IFNAMSIZ);
+ if (setsockopt(drv->dhcp_sock, SOL_SOCKET, SO_BINDTODEVICE,
+ (char *) &ifr, sizeof(ifr)) < 0) {
+ perror("setsockopt[SOL_SOCKET,SO_BINDTODEVICE]");
+ return -1;
+ }
+
+ if (bind(drv->dhcp_sock, (struct sockaddr *) &addr2,
+ sizeof(struct sockaddr)) == -1) {
+ perror("bind");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int wired_send_eapol(void *priv, const u8 *addr,
+ const u8 *data, size_t data_len, int encrypt,
+ const u8 *own_addr)
+{
+ struct wired_driver_data *drv = priv;
+ u8 pae_group_addr[ETH_ALEN] = WIRED_EAPOL_MULTICAST_GROUP;
+ struct ieee8023_hdr *hdr;
+ size_t len;
+ u8 *pos;
+ int res;
+
+ len = sizeof(*hdr) + data_len;
+ hdr = os_zalloc(len);
+ if (hdr == NULL) {
+ printf("malloc() failed for wired_send_eapol(len=%lu)\n",
+ (unsigned long) len);
+ return -1;
+ }
+
+ memcpy(hdr->dest, drv->use_pae_group_addr ? pae_group_addr : addr,
+ ETH_ALEN);
+ memcpy(hdr->src, own_addr, ETH_ALEN);
+ hdr->ethertype = htons(ETH_P_PAE);
+
+ pos = (u8 *) (hdr + 1);
+ memcpy(pos, data, data_len);
+
+ res = send(drv->sock, (u8 *) hdr, len, 0);
+ free(hdr);
+
+ if (res < 0) {
+ perror("wired_send_eapol: send");
+ printf("wired_send_eapol - packet len: %lu - failed\n",
+ (unsigned long) len);
+ }
+
+ return res;
+}
+
+
+static void * wired_driver_init(struct hostapd_data *hapd)
+{
+ struct wired_driver_data *drv;
+
+ drv = os_zalloc(sizeof(struct wired_driver_data));
+ if (drv == NULL) {
+ printf("Could not allocate memory for wired driver data\n");
+ return NULL;
+ }
+
+ drv->hapd = hapd;
+ drv->use_pae_group_addr = hapd->conf->use_pae_group_addr;
+
+ if (wired_init_sockets(drv)) {
+ free(drv);
+ return NULL;
+ }
+
+ return drv;
+}
+
+
+static void wired_driver_deinit(void *priv)
+{
+ struct wired_driver_data *drv = priv;
+
+ if (drv->sock >= 0)
+ close(drv->sock);
+
+ if (drv->dhcp_sock >= 0)
+ close(drv->dhcp_sock);
+
+ free(drv);
+}
+
+
+const struct wpa_driver_ops wpa_driver_wired_ops = {
+ .name = "wired",
+ .init = wired_driver_init,
+ .deinit = wired_driver_deinit,
+ .send_eapol = wired_send_eapol,
+};