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Several source comment changes.

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This commit is contained in:
likewise 2003-10-02 21:43:18 +00:00
parent 73a095572e
commit 5df9545dcc
1 changed files with 14 additions and 10 deletions
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18
src/netif/etharp.c
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@ -4,8 +4,10 @@
*
* Functionally, ARP is divided into two parts. The first maps an IP address
* to a physical address when sending a packet, and the second part answers
* requests from other machines.
* requests from other machines for our physical address.
*
* This implementation complies with RFC 826 (Ethernet ARP) and supports
* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6.
*/
/*
@ -497,9 +499,9 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
* returned, ready to be sent.
*
* If ARP does not have the Ethernet address in cache the packet is
* queued and a ARP request is sent (on a best-effort basis). This
* ARP request is returned as a pbuf, which should be sent by the
* caller.
* queued (if enabled and space available) and a ARP request is sent.
* This ARP request is returned as a pbuf, which should be sent by
* the caller.
*
* If ARP failed to allocate resources, NULL is returned.
*
@ -509,7 +511,8 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
* @param ipaddr The IP address of the packet destination.
* @param pbuf The pbuf(s) containing the IP packet to be sent.
*
* @return If non-NULL, a packet ready to be sent.
* @return If non-NULL, a packet ready to be sent by caller.
*
*/
struct pbuf *
etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
@ -549,7 +552,7 @@ etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
else if (ip_addr_ismulticast(ipaddr)) {
/* Hash IP multicast address to MAC address. */
mcastaddr.addr[0] = 0x01;
mcastaddr.addr[1] = 0x0;
mcastaddr.addr[1] = 0x00;
mcastaddr.addr[2] = 0x5e;
mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
mcastaddr.addr[4] = ip4_addr3(ipaddr);
@ -577,7 +580,7 @@ etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
}
/* Ethernet address for IP destination address is in ARP cache? */
for(i = 0; i < ARP_TABLE_SIZE; ++i) {
for (i = 0; i < ARP_TABLE_SIZE; ++i) {
/* match found? */
if (arp_table[i].state == ETHARP_STATE_STABLE &&
ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
@ -588,6 +591,7 @@ etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
/* could not find the destination Ethernet address in ARP cache? */
if (dest == NULL) {
/* ARP query for the IP address, submit this IP packet for queueing */
/* TODO: How do we handle netif->ipaddr == ipaddr? */
etharp_query(netif, ipaddr, q);
/* return nothing */
return NULL;