From d724a61b09d9a7c43eca0bbb6a33302004a8e673 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 27 Aug 2010 21:55:36 +0200 Subject: [PATCH] send gratuitous ARP whenever a host entry is refreshed --- main.c | 34 ++++++++++++++++------------------ 1 file changed, 16 insertions(+), 18 deletions(-) diff --git a/main.c b/main.c index 2f3bae8..539913b 100644 --- a/main.c +++ b/main.c @@ -206,8 +206,8 @@ void relayd_add_pending_route(const uint8_t *gateway, const uint8_t *dest, uint8 } } -static void send_arp_reply(struct relayd_interface *rif, uint8_t spa[4], - uint8_t tha[ETH_ALEN], uint8_t tpa[4]) +static void send_arp_reply(struct relayd_interface *rif, const uint8_t spa[4], + const uint8_t tha[ETH_ALEN], const uint8_t tpa[4]) { struct arp_packet pkt; @@ -291,6 +291,19 @@ static struct relayd_host *add_host(struct relayd_interface *rif, const uint8_t return host; } +static void send_gratuitous_arp(struct relayd_interface *rif, const uint8_t *spa) +{ + struct relayd_interface *to_rif; + + list_for_each_entry(to_rif, &interfaces, list) { + if (rif == to_rif) + continue; + + send_arp_reply(to_rif, spa, NULL, spa); + } +} + + struct relayd_host *relayd_refresh_host(struct relayd_interface *rif, const uint8_t *lladdr, const uint8_t *ipaddr) { struct relayd_host *host; @@ -315,6 +328,7 @@ struct relayd_host *relayd_refresh_host(struct relayd_interface *rif, const uint } else { host->cleanup_pending = false; uloop_timeout_set(&host->timeout, host_timeout * 1000); + send_gratuitous_arp(rif, ipaddr); } return host; @@ -378,10 +392,8 @@ static void recv_arp_request(struct relayd_interface *rif, struct arp_packet *pk relay_arp_request(rif, pkt); } - static void recv_arp_reply(struct relayd_interface *rif, struct arp_packet *pkt) { - struct relayd_interface *to_rif; struct relayd_host *host; DPRINTF(2, "%s: received ARP reply for "IP_FMT" from "MAC_FMT", deliver to "IP_FMT"\n", @@ -393,20 +405,6 @@ static void recv_arp_reply(struct relayd_interface *rif, struct arp_packet *pkt) if (memcmp(pkt->arp.arp_sha, rif->sll.sll_addr, ETH_ALEN) != 0) relayd_refresh_host(rif, pkt->arp.arp_sha, pkt->arp.arp_spa); - if (!memcmp(pkt->arp.arp_tpa, rif->src_ip, 4)) { - /* - * locally initiated lookup, relay as gratuitous ARP - * to all other interfaces - */ - list_for_each_entry(to_rif, &interfaces, list) { - if (rif == to_rif) - continue; - - send_arp_reply(to_rif, pkt->arp.arp_spa, NULL, pkt->arp.arp_spa); - } - return; - } - host = find_host_by_ipaddr(NULL, pkt->arp.arp_tpa); if (!host) return; -- 2.25.1