static void eth_iface_init(struct net_if *iface)
{
struct eth_context *ctx = net_if_get_device(iface)->driver_data;
struct net_linkaddr *ll_addr = eth_get_mac(ctx);
ctx->iface = iface;
ethernet_init(iface);
if (ctx->init_done) {
return;
}
net_lldp_set_lldpdu(iface);
ctx->init_done = true;
#if defined(CONFIG_ETH_NATIVE_POSIX_RANDOM_MAC)
/* 00-00-5E-00-53-xx Documentation RFC 7042 */
ctx->mac_addr[0] = 0x00;
ctx->mac_addr[1] = 0x00;
ctx->mac_addr[2] = 0x5E;
ctx->mac_addr[3] = 0x00;
ctx->mac_addr[4] = 0x53;
ctx->mac_addr[5] = sys_rand32_get();
/* The TUN/TAP setup script will by default set the MAC address of host
* interface to 00:00:5E:00:53:FF so do not allow that.
*/
if (ctx->mac_addr[5] == 0xff) {
ctx->mac_addr[5] = 0x01;
}
#else
if (CONFIG_ETH_NATIVE_POSIX_MAC_ADDR[0] != 0) {
if (net_bytes_from_str(ctx->mac_addr, sizeof(ctx->mac_addr),
CONFIG_ETH_NATIVE_POSIX_MAC_ADDR) < 0) {
LOG_ERR("Invalid MAC address %s",
CONFIG_ETH_NATIVE_POSIX_MAC_ADDR);
}
}
#endif
net_if_set_link_addr(iface, ll_addr->addr, ll_addr->len,
NET_LINK_ETHERNET);
ctx->if_name = ETH_NATIVE_POSIX_DRV_NAME;
ctx->dev_fd = eth_iface_create(ctx->if_name, false);
if (ctx->dev_fd < 0) {
LOG_ERR("Cannot create %s (%d)", ctx->if_name, ctx->dev_fd);
} else {
/* Create a thread that will handle incoming data from host */
create_rx_handler(ctx);
eth_setup_host(ctx->if_name);
eth_start_script(ctx->if_name);
}
}
/* broadcast_send
*
* Fire off a broadcast packet with information about this DAC.
*/
void broadcast_send(void) {
/* Because lwip is an enormous steaming pile of the finest software
* engineering, it is not possible to just allocate *one* pbuf
* during initialization - udp_send modifies the pbuf it is given
* and changes, among other things, its total length. (??!) So we
* allocatea fresh one each time.
*/
udp_new(&broadcast_pcb);
udp_bind(&broadcast_pcb, IP_ADDR_ANY, BROADCAST_PORT);
udp_connect(&broadcast_pcb, IP_ADDR_BROADCAST, BROADCAST_PORT);
struct pbuf * p = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct
dac_broadcast), PBUF_RAM);
/* Shamefully bail out. */
if (!p)
return;
struct dac_broadcast *pkt = (struct dac_broadcast *) p->payload;
eth_get_mac(pkt->mac_address);
fill_status(&pkt->status);
pkt->buffer_capacity = DAC_BUFFER_POINTS - 1;
pkt->max_point_rate = DAC_MAX_POINT_RATE;
pkt->hw_revision = 0; // XXX TODO
pkt->sw_revision = 1; // XXX TODO - integrate into build system
udp_send(&broadcast_pcb, p);
pbuf_free(p);
udp_remove(&broadcast_pcb);
}