hostap/hostapd/driver_wired.c

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/*
* 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 "config.h"
#include "eloop.h"
#include "sta_info.h"
#include "driver.h"
#include "accounting.h"
struct wired_driver_data {
struct hostapd_data *hapd;
char iface[IFNAMSIZ + 1];
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);
} 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);
hostapd_eapol_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, drv->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, drv->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, drv->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;
os_strlcpy(drv->iface, hapd->conf->iface, sizeof(drv->iface));
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,
};