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fixed bug #34684: Clear the arp table cache when netif is brought down

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This commit is contained in:
goldsimon 2011-11-22 21:44:28 +01:00
parent 96d332e234
commit 08b497faea
4 changed files with 27 additions and 2 deletions
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4
CHANGELOG
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@ -69,6 +69,10 @@ HISTORY
++ Bugfixes:
2011-11-22: Simon Goldschmidt
* netif.c, etharp.h/.c: fixed bug #34684: Clear the arp table cache when
netif is brought down
2011-10-28: Simon Goldschmidt
* tcp_in.c: fixed bug #34638: Dead code in tcp_receive - pcb->dupacks

5
src/core/netif.c
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@ -539,6 +539,11 @@ void netif_set_down(struct netif *netif)
snmp_get_sysuptime(&netif->ts);
#endif
#if LWIP_ARP
if (netif->flags & NETIF_FLAG_ETHARP) {
etharp_cleanup_netif(netif);
}
#endif /* LWIP_ARP */
NETIF_STATUS_CALLBACK(netif);
}
}

1
src/include/netif/etharp.h
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@ -191,6 +191,7 @@ err_t etharp_request(struct netif *netif, ip_addr_t *ipaddr);
* nodes to update an entry in their ARP cache.
* From RFC 3220 "IP Mobility Support for IPv4" section 4.6. */
#define etharp_gratuitous(netif) etharp_request((netif), &(netif)->ip_addr)
void etharp_cleanup_netif(struct netif *netif);
#if ETHARP_SUPPORT_STATIC_ENTRIES
err_t etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr);

19
src/netif/etharp.c
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@ -112,9 +112,7 @@ struct etharp_entry {
struct pbuf *q;
#endif /* ARP_QUEUEING */
ip_addr_t ipaddr;
#if LWIP_SNMP
struct netif *netif;
#endif /* LWIP_SNMP */
struct eth_addr ethaddr;
u8_t state;
u8_t ctime;
@ -578,6 +576,23 @@ etharp_remove_static_entry(ip_addr_t *ipaddr)
}
#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
/**
* Remove all ARP table entries of the specified netif.
*
* @param netif points to a network interface
*/
void etharp_cleanup_netif(struct netif *netif)
{
u8_t i;
for (i = 0; i < ARP_TABLE_SIZE; ++i) {
u8_t state = arp_table[i].state;
if ((state != ETHARP_STATE_EMPTY) && (arp_table[i].netif == netif)) {
etharp_free_entry(i);
}
}
}
/**
* Finds (stable) ethernet/IP address pair from ARP table
* using interface and IP address index.