$search
00001 /* 00002 * WPA Supplicant - Layer2 packet handling with Linux packet sockets 00003 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi> 00004 * 00005 * This program is free software; you can redistribute it and/or modify 00006 * it under the terms of the GNU General Public License version 2 as 00007 * published by the Free Software Foundation. 00008 * 00009 * Alternatively, this software may be distributed under the terms of BSD 00010 * license. 00011 * 00012 * See README and COPYING for more details. 00013 */ 00014 00015 #include "includes.h" 00016 #include <sys/ioctl.h> 00017 #include <netpacket/packet.h> 00018 #include <net/if.h> 00019 00020 #include "common.h" 00021 #include "eloop.h" 00022 #include "l2_packet.h" 00023 00024 00025 struct l2_packet_data { 00026 int fd; /* packet socket for EAPOL frames */ 00027 char ifname[IFNAMSIZ + 1]; 00028 int ifindex; 00029 u8 own_addr[ETH_ALEN]; 00030 void (*rx_callback)(void *ctx, const u8 *src_addr, 00031 const u8 *buf, size_t len); 00032 void *rx_callback_ctx; 00033 int l2_hdr; /* whether to include layer 2 (Ethernet) header data 00034 * buffers */ 00035 }; 00036 00037 00038 int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr) 00039 { 00040 os_memcpy(addr, l2->own_addr, ETH_ALEN); 00041 return 0; 00042 } 00043 00044 00045 int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto, 00046 const u8 *buf, size_t len) 00047 { 00048 int ret; 00049 if (l2 == NULL) 00050 return -1; 00051 if (l2->l2_hdr) { 00052 ret = send(l2->fd, buf, len, 0); 00053 if (ret < 0) 00054 perror("l2_packet_send - send"); 00055 } else { 00056 struct sockaddr_ll ll; 00057 os_memset(&ll, 0, sizeof(ll)); 00058 ll.sll_family = AF_PACKET; 00059 ll.sll_ifindex = l2->ifindex; 00060 ll.sll_protocol = htons(proto); 00061 ll.sll_halen = ETH_ALEN; 00062 os_memcpy(ll.sll_addr, dst_addr, ETH_ALEN); 00063 ret = sendto(l2->fd, buf, len, 0, (struct sockaddr *) &ll, 00064 sizeof(ll)); 00065 if (ret < 0) 00066 perror("l2_packet_send - sendto"); 00067 } 00068 return ret; 00069 } 00070 00071 00072 static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx) 00073 { 00074 struct l2_packet_data *l2 = eloop_ctx; 00075 u8 buf[2300]; 00076 int res; 00077 struct sockaddr_ll ll; 00078 socklen_t fromlen; 00079 00080 os_memset(&ll, 0, sizeof(ll)); 00081 fromlen = sizeof(ll); 00082 res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &ll, 00083 &fromlen); 00084 if (res < 0) { 00085 perror("l2_packet_receive - recvfrom"); 00086 return; 00087 } 00088 00089 l2->rx_callback(l2->rx_callback_ctx, ll.sll_addr, buf, res); 00090 } 00091 00092 00093 struct l2_packet_data * l2_packet_init( 00094 const char *ifname, const u8 *own_addr, unsigned short protocol, 00095 void (*rx_callback)(void *ctx, const u8 *src_addr, 00096 const u8 *buf, size_t len), 00097 void *rx_callback_ctx, int l2_hdr) 00098 { 00099 struct l2_packet_data *l2; 00100 struct ifreq ifr; 00101 struct sockaddr_ll ll; 00102 00103 l2 = os_zalloc(sizeof(struct l2_packet_data)); 00104 if (l2 == NULL) 00105 return NULL; 00106 os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname)); 00107 l2->rx_callback = rx_callback; 00108 l2->rx_callback_ctx = rx_callback_ctx; 00109 l2->l2_hdr = l2_hdr; 00110 00111 l2->fd = socket(PF_PACKET, l2_hdr ? SOCK_RAW : SOCK_DGRAM, 00112 htons(protocol)); 00113 if (l2->fd < 0) { 00114 perror("socket(PF_PACKET)"); 00115 os_free(l2); 00116 return NULL; 00117 } 00118 os_memset(&ifr, 0, sizeof(ifr)); 00119 os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name)); 00120 if (ioctl(l2->fd, SIOCGIFINDEX, &ifr) < 0) { 00121 perror("ioctl[SIOCGIFINDEX]"); 00122 close(l2->fd); 00123 os_free(l2); 00124 return NULL; 00125 } 00126 l2->ifindex = ifr.ifr_ifindex; 00127 00128 os_memset(&ll, 0, sizeof(ll)); 00129 ll.sll_family = PF_PACKET; 00130 ll.sll_ifindex = ifr.ifr_ifindex; 00131 ll.sll_protocol = htons(protocol); 00132 if (bind(l2->fd, (struct sockaddr *) &ll, sizeof(ll)) < 0) { 00133 perror("bind[PF_PACKET]"); 00134 close(l2->fd); 00135 os_free(l2); 00136 return NULL; 00137 } 00138 00139 if (ioctl(l2->fd, SIOCGIFHWADDR, &ifr) < 0) { 00140 perror("ioctl[SIOCGIFHWADDR]"); 00141 close(l2->fd); 00142 os_free(l2); 00143 return NULL; 00144 } 00145 os_memcpy(l2->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN); 00146 00147 eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL); 00148 00149 return l2; 00150 } 00151 00152 00153 void l2_packet_deinit(struct l2_packet_data *l2) 00154 { 00155 if (l2 == NULL) 00156 return; 00157 00158 if (l2->fd >= 0) { 00159 eloop_unregister_read_sock(l2->fd); 00160 close(l2->fd); 00161 } 00162 00163 os_free(l2); 00164 } 00165 00166 00167 int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len) 00168 { 00169 int s; 00170 struct ifreq ifr; 00171 struct sockaddr_in *saddr; 00172 size_t res; 00173 00174 s = socket(PF_INET, SOCK_DGRAM, 0); 00175 if (s < 0) { 00176 perror("socket"); 00177 return -1; 00178 } 00179 os_memset(&ifr, 0, sizeof(ifr)); 00180 os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name)); 00181 if (ioctl(s, SIOCGIFADDR, &ifr) < 0) { 00182 if (errno != EADDRNOTAVAIL) 00183 perror("ioctl[SIOCGIFADDR]"); 00184 close(s); 00185 return -1; 00186 } 00187 close(s); 00188 saddr = aliasing_hide_typecast(&ifr.ifr_addr, struct sockaddr_in); 00189 if (saddr->sin_family != AF_INET) 00190 return -1; 00191 res = os_strlcpy(buf, inet_ntoa(saddr->sin_addr), len); 00192 if (res >= len) 00193 return -1; 00194 return 0; 00195 } 00196 00197 00198 void l2_packet_notify_auth_start(struct l2_packet_data *l2) 00199 { 00200 }