lwIP
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Outline
#include "lwip/opt.h"
#include "lwip/acd.h"
#include "lwip/dhcp.h"
#include "lwip/prot/dhcp.h"
#include "lwip/timeouts.h"
#define ACD_DHCP_ARP_REPLY_TIMEOUT_MS
acd_suspend(struct netif *)
acd_remove(struct netif *, struct acd *)
acd_netif_ip_addr_changed(struct netif *, const ip_addr_t *, const ip_addr_t *)
acd_network_changed_link_down(struct netif *)
acd_arp_reply(struct netif *, struct etharp_hdr *)
acd_add(struct netif *, struct acd *, acd_conflict_callback_t)
send_probe_once(struct netif *)
acd_dhcp_check_timeout_cb(void *)
acd_start(struct netif *, struct acd *, ip4_addr_t)
Files
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SourceVuESP-IDF Framework and ExampleslwIPport/acd_dhcp_check.c
 
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/* * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include "lwip/opt.h" /* don't build if not configured for use in lwipopts.h */ #if LWIP_IPV4 && DHCP_DOES_ARP_CHECK #include "lwip/acd.h" #include "lwip/dhcp.h" #include "lwip/prot/dhcp.h" #include "lwip/timeouts.h" #define ACD_DHCP_ARP_REPLY_TIMEOUT_MS 500 static void acd_dhcp_check_timeout_cb(void *arg); static void acd_suspend(struct netif *netif) { struct dhcp *dhcp; struct acd *acd; if (netif == NULL || (dhcp = netif_dhcp_data(netif)) == NULL) { return; }{...} acd = &dhcp->acd; acd->state = ACD_STATE_OFF; sys_untimeout(acd_dhcp_check_timeout_cb, (void *)netif); }{ ... } void acd_remove(struct netif *netif, struct acd *acd) { acd_suspend(netif); acd->acd_conflict_callback = NULL; }{ ... } void acd_netif_ip_addr_changed(struct netif *netif, const ip_addr_t *old_addr, const ip_addr_t *new_addr) { acd_suspend(netif); }{ ... } void acd_network_changed_link_down(struct netif *netif) { acd_suspend(netif); }{ ... } void acd_arp_reply(struct netif *netif, struct etharp_hdr *hdr) { struct dhcp *dhcp; ip4_addr_t sipaddr; struct eth_addr netifaddr; struct acd *acd; if (netif == NULL || (dhcp = netif_dhcp_data(netif)) == NULL) { return; }{...} acd = &dhcp->acd; // Check that we're looking for ARP reply in ACD_PROBING state and DHCP_CHECKING state if (hdr->opcode != PP_HTONS(ARP_REPLY) || dhcp->state != DHCP_STATE_CHECKING || acd->state != ACD_STATE_PROBING || acd->acd_conflict_callback == NULL) { return; }{...} SMEMCPY(netifaddr.addr, netif->hwaddr, ETH_HWADDR_LEN); IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(&sipaddr, &hdr->sipaddr); LWIP_DEBUGF(ACD_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("acd_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n", ip4_addr_get_u32(&sipaddr))); /* did another host (not our mac addr) respond with the address we were offered by the DHCP server? */ if (ip4_addr_eq(&sipaddr, &dhcp->offered_ip_addr) && !eth_addr_eq(&netifaddr, &hdr->shwaddr)) { LWIP_DEBUGF(ACD_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING, ("acd_arp_reply(): arp reply matched with offered address, declining\n")); dhcp->acd.acd_conflict_callback(netif, ACD_DECLINE); }{...} }{ ... } err_t acd_add(struct netif *netif, struct acd *acd, acd_conflict_callback_t acd_conflict_callback) { acd->acd_conflict_callback = acd_conflict_callback; return ERR_OK; }{ ... } static void send_probe_once(struct netif *netif) { struct dhcp *dhcp = netif_dhcp_data(netif); if (etharp_query(netif, &dhcp->offered_ip_addr, NULL) != ERR_OK) { LWIP_DEBUGF(ACD_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("acd_send_probe_once(): could not perform ARP query\n")); return; }{...} if (dhcp->tries < 255) { dhcp->tries++; }{...} LWIP_DEBUGF(ACD_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("acd_send_probe_once(): set request timeout %"U16_F" msecs\n", ACD_DHCP_ARP_REPLY_TIMEOUT_MS)); sys_timeout(ACD_DHCP_ARP_REPLY_TIMEOUT_MS, acd_dhcp_check_timeout_cb, (void *)netif); }{ ... } static void acd_dhcp_check_timeout_cb(void *arg) { struct netif *netif = (struct netif *)arg; struct dhcp *dhcp; struct acd *acd; if (netif == NULL || (dhcp = netif_dhcp_data(netif)) == NULL) { return; }{...} acd = &dhcp->acd; if (acd->state != ACD_STATE_PROBING || acd->acd_conflict_callback == NULL || dhcp->state != DHCP_STATE_CHECKING) { return; }{...} LWIP_DEBUGF(ACD_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("acd_dhcp_check_timeout_cb(): CHECKING, ARP request timed out\n")); if (dhcp->tries <= 1) { send_probe_once(netif); }{...} else { // No conflict detected dhcp->acd.acd_conflict_callback(netif, ACD_IP_OK); }{...} }{ ... } err_t acd_start(struct netif *netif, struct acd *acd, ip4_addr_t ipaddr) { if (netif == NULL || netif_dhcp_data(netif) == NULL) { return ERR_ARG; }{...} acd->state = ACD_STATE_PROBING; send_probe_once(netif); return ERR_OK; }{ ... } /* ... */#endif /* LWIP_IPV4 && DHCP_DOES_ARP_CHECK */
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