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Fixed ARP input processing: only add a new entry if a request was directed as us (RFC 826, Packet Reception), otherwise only update existing entries; internalized some functions

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goldsimon 2010-02-14 18:08:16 +00:00
parent c5dfa4099d
commit 4c9fe60693
3 changed files with 16 additions and 13 deletions
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5
CHANGELOG
View File

@ -131,6 +131,11 @@ HISTORY
++ Bugfixes:
2010-02-14: Simon Goldschmidt
* etharp.c/.h: Fixed ARP input processing: only add a new entry if a
request was directed as us (RFC 826, Packet Reception), otherwise
only update existing entries; internalized some functions
2010-02-14: Simon Goldschmidt
* netif.h, etharp.c, tcpip.c: Fixed bug #28183 (ARP and TCP/IP cannot be
disabled on netif used for PPPoE) by adding a new netif flag

3
src/include/netif/etharp.h
View File

@ -163,9 +163,6 @@ struct etharp_q_entry {
void etharp_tmr(void);
s8_t etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
struct eth_addr **eth_ret, ip_addr_t **ip_ret);
void etharp_ip_input(struct netif *netif, struct pbuf *p);
void etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr,
struct pbuf *p);
err_t etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr);
err_t etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q);
err_t etharp_request(struct netif *netif, ip_addr_t *ipaddr);

21
src/netif/etharp.c
View File

@ -344,10 +344,10 @@ find_entry(ip_addr_t *ipaddr, u8_t flags)
}
/* { we have no match } => try to create a new entry */
/* no empty entry found and not allowed to recycle? */
if (((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_TRY_HARD) == 0))
/* or don't create new entry, only search? */
|| ((flags & ETHARP_FIND_ONLY) != 0)) {
/* don't create new entry, only search? */
if (((flags & ETHARP_FIND_ONLY) != 0) ||
/* or no empty entry found and not allowed to recycle? */
((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_TRY_HARD) == 0))) {
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
return (s8_t)ERR_MEM;
}
@ -565,6 +565,7 @@ etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
return -1;
}
#if ETHARP_TRUST_IP_MAC
/**
* Updates the ARP table using the given IP packet.
*
@ -580,7 +581,7 @@ etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
*
* @see pbuf_free()
*/
void
static void
etharp_ip_input(struct netif *netif, struct pbuf *p)
{
struct eth_hdr *ethhdr;
@ -604,12 +605,12 @@ etharp_ip_input(struct netif *netif, struct pbuf *p)
}
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
/* update ARP table */
/* update the source IP address in the cache, if present */
/* @todo We could use ETHARP_TRY_HARD if we think we are going to talk
* back soon (for example, if the destination IP address is ours. */
update_arp_entry(netif, &(iphdr->src), &(ethhdr->src), 0);
update_arp_entry(netif, &(iphdr->src), &(ethhdr->src), ETHARP_FIND_ONLY);
}
#endif /* ETHARP_TRUST_IP_MAC */
/**
* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
@ -626,7 +627,7 @@ etharp_ip_input(struct netif *netif, struct pbuf *p)
*
* @see pbuf_free()
*/
void
static void
etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
{
struct etharp_hdr *hdr;
@ -704,7 +705,7 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
/* ARP message not directed to us? */
} else {
/* update the source IP address in the cache, if present */
update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), 0);
update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ETHARP_FIND_ONLY);
}
/* now act on the message itself */