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Small optimalization for udp_input().

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This commit is contained in:
christiaans 2006-01-02 12:06:02 +00:00
parent 818a726679
commit 6c8850698d
1 changed files with 21 additions and 31 deletions
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52
src/core/udp.c
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@ -87,8 +87,10 @@ udp_input(struct pbuf *p, struct netif *inp)
{
struct udp_hdr *udphdr;
struct udp_pcb *pcb;
struct udp_pcb *uncon_pcb;
struct ip_hdr *iphdr;
u16_t src, dest;
u8_t local_match;
PERF_START;
@ -122,7 +124,9 @@ udp_input(struct pbuf *p, struct netif *inp)
ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src),
ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src), ntohs(udphdr->src)));
/* Iterate through the UDP pcb list for a fully matching pcb */
local_match = 0;
uncon_pcb = NULL;
/* Iterate through the UDP pcb list for a matching pcb */
for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
/* print the PCB local and remote address */
LWIP_DEBUGF(UDP_DEBUG, ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
@ -131,43 +135,29 @@ udp_input(struct pbuf *p, struct netif *inp)
ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip),
ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port));
/* PCB remote port matches UDP source port? */
if ((pcb->remote_port == src) &&
/* PCB local port matches UDP destination port? */
(pcb->local_port == dest) &&
/* accepting from any remote (source) IP address? or... */
(ip_addr_isany(&pcb->remote_ip) ||
/* PCB remote IP address matches UDP source IP address? */
ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src))) &&
/* accepting on any local (netif) IP address? or... */
/* compare PCB local addr+port to UDP destination addr+port */
if ((pcb->local_port == dest) &&
(ip_addr_isany(&pcb->local_ip) ||
/* PCB local IP address matches UDP destination IP address? */
ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
local_match = 1;
if ((uncon_pcb == NULL) &&
((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
/* the first unconnected matching PCB */
uncon_pcb = pcb;
}
}
/* compare PCB remote addr+port to UDP source addr+port */
if ((local_match != 0) &&
(pcb->remote_port == src) &&
(ip_addr_isany(&pcb->remote_ip) ||
ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) {
/* the first fully matching PCB */
break;
}
}
/* no fully matching pcb found? then look for an unconnected pcb */
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) {
LWIP_DEBUGF(UDP_DEBUG, ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
ip4_addr1(&pcb->local_ip), ip4_addr2(&pcb->local_ip),
ip4_addr3(&pcb->local_ip), ip4_addr4(&pcb->local_ip), pcb->local_port,
ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip),
ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port));
/* unconnected? */
if (((pcb->flags & UDP_FLAGS_CONNECTED) == 0) &&
/* destination port matches? */
(pcb->local_port == dest) &&
/* not bound to a specific (local) interface address? or... */
(ip_addr_isany(&pcb->local_ip) ||
/* ...matching interface address? */
ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
break;
}
}
pcb = uncon_pcb;
}
/* Check checksum if this is a match or if it was directed at us. */