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Enhanced documentation on UDP PCB matchjng code.

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This commit is contained in:
likewise 2003-01-17 15:16:33 +00:00
parent 42309b5d6f
commit 2154ac3ecb
1 changed files with 19 additions and 5 deletions
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22
src/core/udp.c
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@ -28,7 +28,7 @@
* *
* Author: Adam Dunkels <adam@sics.se> * Author: Adam Dunkels <adam@sics.se>
* *
* $Id: udp.c,v 1.8 2003/01/13 13:24:11 likewise Exp $ * $Id: udp.c,v 1.9 2003/01/17 15:16:33 likewise Exp $
*/ */
/*-----------------------------------------------------------------------------------*/ /*-----------------------------------------------------------------------------------*/
@ -174,10 +174,22 @@ udp_input(struct pbuf *p, struct netif *inp)
udp_debug_print(udphdr); udp_debug_print(udphdr);
#endif /* UDP_DEBUG */ #endif /* UDP_DEBUG */
/* Demultiplex packet. First, go for a perfect match. */ /* Iterate through the UDP pcb list for a fully matching pcb */
for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) { for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
DEBUGF(UDP_DEBUG, ("udp_input: pcb local port %d (dgram %d)\n", DEBUGF(UDP_DEBUG, ("udp_input: pcb local port %u, dgram dest port %u)\n",
pcb->local_port, ntohs(udphdr->dest))); pcb->local_port, ntohs(udphdr->dest)));
DEBUGF(UDP_DEBUG, (" pcb remote ip: %d.%d.%d.%d, dgram src: %d.%d.%d.%d,\n",
ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip),
ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip),
ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src),
ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src)));
DEBUGF(UDP_DEBUG, (" pcb local ip: %d.%d.%d.%d, dgram dest: %d.%d.%d.%d\n",
ip4_addr1(&pcb->local_ip), ip4_addr2(&pcb->local_ip),
ip4_addr3(&pcb->local_ip), ip4_addr4(&pcb->local_ip),
ip4_addr1(&iphdr->dest), ip4_addr2(&iphdr->dest),
ip4_addr3(&iphdr->dest), ip4_addr4(&iphdr->dest)));
/* Do both local and remote addresses match? */
if(pcb->remote_port == src && if(pcb->remote_port == src &&
pcb->local_port == dest && pcb->local_port == dest &&
(ip_addr_isany(&pcb->remote_ip) || (ip_addr_isany(&pcb->remote_ip) ||
@ -187,8 +199,10 @@ udp_input(struct pbuf *p, struct netif *inp)
break; break;
} }
} }
/* no fully matching pcb found? */
if(pcb == NULL) { if(pcb == NULL) {
/* Iterate through the UDP pcb list for a pcb that matches
the local address. */
for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) { for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
DEBUGF(UDP_DEBUG, ("udp_input: pcb local port %d (dgram %d)\n", DEBUGF(UDP_DEBUG, ("udp_input: pcb local port %d (dgram %d)\n",
pcb->local_port, dest)); pcb->local_port, dest));