static void autoip_start_probing(struct netif *netif) { struct autoip *autoip = netif->autoip; autoip->state = AUTOIP_STATE_PROBING; autoip->sent_num = 0; LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); /* time to wait to first probe, this is randomly * choosen out of 0 to PROBE_WAIT seconds. * compliant to RFC 3927 Section 2.2.1 */ autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND)); /* * if we tried more then MAX_CONFLICTS we must limit our rate for * accquiring and probing address * compliant to RFC 3927 Section 2.2.1 */ if(autoip->tried_llipaddr > MAX_CONFLICTS) { autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND; } }
/** * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds */ void autoip_tmr() { struct netif *netif = netif_list; /* loop through netif's */ while (netif != NULL) { /* only act on AutoIP configured interfaces */ if (netif->autoip != NULL) { if(netif->autoip->lastconflict > 0) { netif->autoip->lastconflict--; } LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n", (u16_t)(netif->autoip->state), netif->autoip->ttw)); switch(netif->autoip->state) { case AUTOIP_STATE_PROBING: if(netif->autoip->ttw > 0) { netif->autoip->ttw--; } else { if(netif->autoip->sent_num >= PROBE_NUM) { netif->autoip->state = AUTOIP_STATE_ANNOUNCING; netif->autoip->sent_num = 0; netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND; } else { autoip_arp_probe(netif); LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() PROBING Sent Probe\n")); netif->autoip->sent_num++; /* calculate time to wait to next probe */ netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) % ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) + PROBE_MIN * AUTOIP_TICKS_PER_SECOND); } } break; case AUTOIP_STATE_ANNOUNCING: if(netif->autoip->ttw > 0) { netif->autoip->ttw--; } else { if(netif->autoip->sent_num == 0) { /* We are here the first time, so we waited ANNOUNCE_WAIT seconds * Now we can bind to an IP address and use it. * * autoip_bind calls netif_set_up. This triggers a gratuitous ARP * which counts as an announcement. */ autoip_bind(netif); } else { autoip_arp_announce(netif); LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() ANNOUNCING Sent Announce\n")); } netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND; netif->autoip->sent_num++; if(netif->autoip->sent_num >= ANNOUNCE_NUM) { netif->autoip->state = AUTOIP_STATE_BOUND; netif->autoip->sent_num = 0; netif->autoip->ttw = 0; } } break; } } /* proceed to next network interface */ netif = netif->next; } }
/** * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds */ void autoip_tmr() { struct netif *netif = netif_list; /* loop through netif's */ while (netif != NULL) { /* only act on AutoIP configured interfaces */ if (netif->autoip != NULL) { if (netif->autoip->lastconflict > 0) { netif->autoip->lastconflict--; } LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n", (u16_t)(netif->autoip->state), netif->autoip->ttw)); switch(netif->autoip->state) { case AUTOIP_STATE_PROBING: if (netif->autoip->ttw > 0) { netif->autoip->ttw--; } else { if (netif->autoip->sent_num >= PROBE_NUM) { netif->autoip->state = AUTOIP_STATE_ANNOUNCING; netif->autoip->sent_num = 0; netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND; LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); } else { autoip_arp_probe(netif); LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() PROBING Sent Probe\n")); netif->autoip->sent_num++; /* calculate time to wait to next probe */ netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) % ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) + PROBE_MIN * AUTOIP_TICKS_PER_SECOND); } } break; case AUTOIP_STATE_ANNOUNCING: if (netif->autoip->ttw > 0) { netif->autoip->ttw--; } else { if (netif->autoip->sent_num == 0) { /* We are here the first time, so we waited ANNOUNCE_WAIT seconds * Now we can bind to an IP address and use it. * * autoip_bind calls netif_set_up. This triggers a gratuitous ARP * which counts as an announcement. */ autoip_bind(netif); } else { autoip_arp_announce(netif); /* Store announced IP address in a global variable, so that * it can be retrieved in case of link-loss */ memcpy(&prev_llipaddr, &(netif->autoip->llipaddr), sizeof(ip_addr_t)); LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() ANNOUNCING Sent Announce\n")); } netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND; netif->autoip->sent_num++; if (netif->autoip->sent_num >= ANNOUNCE_NUM) { netif->autoip->state = AUTOIP_STATE_BOUND; netif->autoip->sent_num = 0; netif->autoip->ttw = 0; netif->autoip->tried_llipaddr = 0; netif_send_status(netif); LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); } } break; } } /* proceed to next network interface */ netif = netif->next; } }
/** * Start AutoIP client * * @param netif network interface on which start the AutoIP client */ err_t autoip_start (struct netif * netif) { struct autoip *autoip = netif->autoip; err_t result = ERR_OK; if (netif_is_up (netif)) { netif_set_down (netif); } /* Set IP-Address, Netmask and Gateway to 0 to make sure that * ARP Packets are formed correctly */ netif->ip_addr.addr = 0; netif->netmask.addr = 0; netif->gw.addr = 0; LWIP_DEBUGF (AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("autoip_start(netif=%p) %c%c%" U16_F "\n", (void *) netif, netif->name[0], netif->name[1], (u16_t) netif->num)); if (autoip == NULL) { /* no AutoIP client attached yet? */ LWIP_DEBUGF (AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): starting new AUTOIP client\n")); autoip = mem_malloc (sizeof (struct autoip)); if (autoip == NULL) { LWIP_DEBUGF (AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): could not allocate autoip\n")); return ERR_MEM; } memset (autoip, 0, sizeof (struct autoip)); /* store this AutoIP client in the netif */ netif->autoip = autoip; LWIP_DEBUGF (AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip")); } else { autoip->state = AUTOIP_STATE_OFF; autoip->ttw = 0; autoip->sent_num = 0; memset (&autoip->llipaddr, 0, sizeof (struct ip_addr)); autoip->lastconflict = 0; } autoip_create_rand_addr (netif, &(autoip->llipaddr)); autoip->tried_llipaddr++; autoip->state = AUTOIP_STATE_PROBING; autoip->sent_num = 0; /* time to wait to first probe, this is randomly * choosen out of 0 to PROBE_WAIT seconds. * compliant to RFC 3927 Section 2.2.1 */ autoip->ttw = (u16_t) (LWIP_AUTOIP_RAND (netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND)); /* * if we tried more then MAX_CONFLICTS we must limit our rate for * accquiring and probing address * compliant to RFC 3927 Section 2.2.1 */ if (autoip->tried_llipaddr > MAX_CONFLICTS) { autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND; } return result; }