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https://github.com/lwip-tcpip/lwip.git
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Small optimalization for udp_input().
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818a726679
commit
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@ -87,8 +87,10 @@ udp_input(struct pbuf *p, struct netif *inp)
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{
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struct udp_hdr *udphdr;
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struct udp_pcb *pcb;
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struct udp_pcb *uncon_pcb;
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struct ip_hdr *iphdr;
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u16_t src, dest;
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u8_t local_match;
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PERF_START;
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@ -122,7 +124,9 @@ udp_input(struct pbuf *p, struct netif *inp)
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ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src),
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ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src), ntohs(udphdr->src)));
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/* Iterate through the UDP pcb list for a fully matching pcb */
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local_match = 0;
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uncon_pcb = NULL;
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/* Iterate through the UDP pcb list for a matching pcb */
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for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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/* print the PCB local and remote address */
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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",
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@ -131,43 +135,29 @@ udp_input(struct pbuf *p, struct netif *inp)
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ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip),
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ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port));
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/* PCB remote port matches UDP source port? */
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if ((pcb->remote_port == src) &&
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/* PCB local port matches UDP destination port? */
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(pcb->local_port == dest) &&
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/* accepting from any remote (source) IP address? or... */
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(ip_addr_isany(&pcb->remote_ip) ||
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/* PCB remote IP address matches UDP source IP address? */
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ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src))) &&
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/* accepting on any local (netif) IP address? or... */
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/* compare PCB local addr+port to UDP destination addr+port */
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if ((pcb->local_port == dest) &&
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(ip_addr_isany(&pcb->local_ip) ||
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/* PCB local IP address matches UDP destination IP address? */
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ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
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local_match = 1;
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if ((uncon_pcb == NULL) &&
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((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
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/* the first unconnected matching PCB */
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uncon_pcb = pcb;
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}
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}
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/* compare PCB remote addr+port to UDP source addr+port */
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if ((local_match != 0) &&
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(pcb->remote_port == src) &&
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(ip_addr_isany(&pcb->remote_ip) ||
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ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) {
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/* the first fully matching PCB */
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break;
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}
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}
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/* no fully matching pcb found? then look for an unconnected pcb */
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if (pcb == NULL) {
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/* Iterate through the UDP PCB list for a pcb that matches
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the local address. */
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for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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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",
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ip4_addr1(&pcb->local_ip), ip4_addr2(&pcb->local_ip),
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ip4_addr3(&pcb->local_ip), ip4_addr4(&pcb->local_ip), pcb->local_port,
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ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip),
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ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port));
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/* unconnected? */
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if (((pcb->flags & UDP_FLAGS_CONNECTED) == 0) &&
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/* destination port matches? */
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(pcb->local_port == dest) &&
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/* not bound to a specific (local) interface address? or... */
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(ip_addr_isany(&pcb->local_ip) ||
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/* ...matching interface address? */
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ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
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break;
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}
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}
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pcb = uncon_pcb;
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}
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/* Check checksum if this is a match or if it was directed at us. */
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