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