00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015 #include "includes.h"
00016 #include <sys/un.h>
00017
00018 #include "common.h"
00019 #include "eloop.h"
00020 #include "l2_packet.h"
00021 #include "common/privsep_commands.h"
00022
00023
00024 struct l2_packet_data {
00025 int fd;
00026 void (*rx_callback)(void *ctx, const u8 *src_addr,
00027 const u8 *buf, size_t len);
00028 void *rx_callback_ctx;
00029 u8 own_addr[ETH_ALEN];
00030 char *own_socket_path;
00031 struct sockaddr_un priv_addr;
00032 };
00033
00034
00035 static int wpa_priv_cmd(struct l2_packet_data *l2, int cmd,
00036 const void *data, size_t data_len)
00037 {
00038 struct msghdr msg;
00039 struct iovec io[2];
00040
00041 io[0].iov_base = &cmd;
00042 io[0].iov_len = sizeof(cmd);
00043 io[1].iov_base = (u8 *) data;
00044 io[1].iov_len = data_len;
00045
00046 os_memset(&msg, 0, sizeof(msg));
00047 msg.msg_iov = io;
00048 msg.msg_iovlen = data ? 2 : 1;
00049 msg.msg_name = &l2->priv_addr;
00050 msg.msg_namelen = sizeof(l2->priv_addr);
00051
00052 if (sendmsg(l2->fd, &msg, 0) < 0) {
00053 perror("L2: sendmsg(cmd)");
00054 return -1;
00055 }
00056
00057 return 0;
00058 }
00059
00060
00061 int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
00062 {
00063 os_memcpy(addr, l2->own_addr, ETH_ALEN);
00064 return 0;
00065 }
00066
00067
00068 int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
00069 const u8 *buf, size_t len)
00070 {
00071 struct msghdr msg;
00072 struct iovec io[4];
00073 int cmd = PRIVSEP_CMD_L2_SEND;
00074
00075 io[0].iov_base = &cmd;
00076 io[0].iov_len = sizeof(cmd);
00077 io[1].iov_base = &dst_addr;
00078 io[1].iov_len = ETH_ALEN;
00079 io[2].iov_base = &proto;
00080 io[2].iov_len = 2;
00081 io[3].iov_base = (u8 *) buf;
00082 io[3].iov_len = len;
00083
00084 os_memset(&msg, 0, sizeof(msg));
00085 msg.msg_iov = io;
00086 msg.msg_iovlen = 4;
00087 msg.msg_name = &l2->priv_addr;
00088 msg.msg_namelen = sizeof(l2->priv_addr);
00089
00090 if (sendmsg(l2->fd, &msg, 0) < 0) {
00091 perror("L2: sendmsg(packet_send)");
00092 return -1;
00093 }
00094
00095 return 0;
00096 }
00097
00098
00099 static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
00100 {
00101 struct l2_packet_data *l2 = eloop_ctx;
00102 u8 buf[2300];
00103 int res;
00104 struct sockaddr_un from;
00105 socklen_t fromlen = sizeof(from);
00106
00107 os_memset(&from, 0, sizeof(from));
00108 res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &from,
00109 &fromlen);
00110 if (res < 0) {
00111 perror("l2_packet_receive - recvfrom");
00112 return;
00113 }
00114 if (res < ETH_ALEN) {
00115 wpa_printf(MSG_DEBUG, "L2: Too show packet received");
00116 return;
00117 }
00118
00119 if (from.sun_family != AF_UNIX ||
00120 os_strncmp(from.sun_path, l2->priv_addr.sun_path,
00121 sizeof(from.sun_path)) != 0) {
00122 wpa_printf(MSG_DEBUG, "L2: Received message from unexpected "
00123 "source");
00124 return;
00125 }
00126
00127 l2->rx_callback(l2->rx_callback_ctx, buf, buf + ETH_ALEN,
00128 res - ETH_ALEN);
00129 }
00130
00131
00132 struct l2_packet_data * l2_packet_init(
00133 const char *ifname, const u8 *own_addr, unsigned short protocol,
00134 void (*rx_callback)(void *ctx, const u8 *src_addr,
00135 const u8 *buf, size_t len),
00136 void *rx_callback_ctx, int l2_hdr)
00137 {
00138 struct l2_packet_data *l2;
00139 char *own_dir = "/tmp";
00140 char *priv_dir = "/var/run/wpa_priv";
00141 size_t len;
00142 static unsigned int counter = 0;
00143 struct sockaddr_un addr;
00144 fd_set rfds;
00145 struct timeval tv;
00146 int res;
00147 u8 reply[ETH_ALEN + 1];
00148 int reg_cmd[2];
00149
00150 l2 = os_zalloc(sizeof(struct l2_packet_data));
00151 if (l2 == NULL)
00152 return NULL;
00153 l2->rx_callback = rx_callback;
00154 l2->rx_callback_ctx = rx_callback_ctx;
00155
00156 len = os_strlen(own_dir) + 50;
00157 l2->own_socket_path = os_malloc(len);
00158 if (l2->own_socket_path == NULL) {
00159 os_free(l2);
00160 return NULL;
00161 }
00162 os_snprintf(l2->own_socket_path, len, "%s/wpa_privsep-l2-%d-%d",
00163 own_dir, getpid(), counter++);
00164
00165 l2->priv_addr.sun_family = AF_UNIX;
00166 os_snprintf(l2->priv_addr.sun_path, sizeof(l2->priv_addr.sun_path),
00167 "%s/%s", priv_dir, ifname);
00168
00169 l2->fd = socket(PF_UNIX, SOCK_DGRAM, 0);
00170 if (l2->fd < 0) {
00171 perror("socket(PF_UNIX)");
00172 os_free(l2->own_socket_path);
00173 l2->own_socket_path = NULL;
00174 os_free(l2);
00175 return NULL;
00176 }
00177
00178 os_memset(&addr, 0, sizeof(addr));
00179 addr.sun_family = AF_UNIX;
00180 os_strlcpy(addr.sun_path, l2->own_socket_path, sizeof(addr.sun_path));
00181 if (bind(l2->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
00182 perror("bind(PF_UNIX)");
00183 goto fail;
00184 }
00185
00186 reg_cmd[0] = protocol;
00187 reg_cmd[1] = l2_hdr;
00188 if (wpa_priv_cmd(l2, PRIVSEP_CMD_L2_REGISTER, reg_cmd, sizeof(reg_cmd))
00189 < 0) {
00190 wpa_printf(MSG_ERROR, "L2: Failed to register with wpa_priv");
00191 goto fail;
00192 }
00193
00194 FD_ZERO(&rfds);
00195 FD_SET(l2->fd, &rfds);
00196 tv.tv_sec = 5;
00197 tv.tv_usec = 0;
00198 res = select(l2->fd + 1, &rfds, NULL, NULL, &tv);
00199 if (res < 0 && errno != EINTR) {
00200 perror("select");
00201 goto fail;
00202 }
00203
00204 if (FD_ISSET(l2->fd, &rfds)) {
00205 res = recv(l2->fd, reply, sizeof(reply), 0);
00206 if (res < 0) {
00207 perror("recv");
00208 goto fail;
00209 }
00210 } else {
00211 wpa_printf(MSG_DEBUG, "L2: Timeout while waiting for "
00212 "registration reply");
00213 goto fail;
00214 }
00215
00216 if (res != ETH_ALEN) {
00217 wpa_printf(MSG_DEBUG, "L2: Unexpected registration reply "
00218 "(len=%d)", res);
00219 }
00220 os_memcpy(l2->own_addr, reply, ETH_ALEN);
00221
00222 eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
00223
00224 return l2;
00225
00226 fail:
00227 close(l2->fd);
00228 l2->fd = -1;
00229 unlink(l2->own_socket_path);
00230 os_free(l2->own_socket_path);
00231 l2->own_socket_path = NULL;
00232 os_free(l2);
00233 return NULL;
00234 }
00235
00236
00237 void l2_packet_deinit(struct l2_packet_data *l2)
00238 {
00239 if (l2 == NULL)
00240 return;
00241
00242 if (l2->fd >= 0) {
00243 wpa_priv_cmd(l2, PRIVSEP_CMD_L2_UNREGISTER, NULL, 0);
00244 eloop_unregister_read_sock(l2->fd);
00245 close(l2->fd);
00246 }
00247
00248 if (l2->own_socket_path) {
00249 unlink(l2->own_socket_path);
00250 os_free(l2->own_socket_path);
00251 }
00252
00253 os_free(l2);
00254 }
00255
00256
00257 int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
00258 {
00259
00260 return -1;
00261 }
00262
00263
00264 void l2_packet_notify_auth_start(struct l2_packet_data *l2)
00265 {
00266 wpa_priv_cmd(l2, PRIVSEP_CMD_L2_NOTIFY_AUTH_START, NULL, 0);
00267 }
