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https://github.com/lwip-tcpip/lwip.git
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SO_REUSE: tcp_input: correctly handle multiple pcbs listening on the same port (but different address): first search for a specific address an only pass to ANY if no specific address has been found listening
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@ -93,6 +93,10 @@ tcp_input(struct pbuf *p, struct netif *inp)
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{
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struct tcp_pcb *pcb, *prev;
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struct tcp_pcb_listen *lpcb;
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#if SO_REUSE
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struct tcp_pcb *lpcb_prev = NULL;
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struct tcp_pcb_listen *lpcb_any = NULL;
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#endif /* SO_REUSE */
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u8_t hdrlen;
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err_t err;
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@ -222,9 +226,35 @@ tcp_input(struct pbuf *p, struct netif *inp)
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are LISTENing for incoming connections. */
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prev = NULL;
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for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
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if ((ip_addr_isany(&(lpcb->local_ip)) ||
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ip_addr_cmp(&(lpcb->local_ip), &(iphdr->dest))) &&
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lpcb->local_port == tcphdr->dest) {
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if (lpcb->local_port == tcphdr->dest) {
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#if SO_REUSE
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if (ip_addr_cmp(&(lpcb->local_ip), &(iphdr->dest))) {
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/* found an exact match */
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break;
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} else if(ip_addr_isany(&(lpcb->local_ip))) {
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/* found an ANY-match */
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lpcb_any = lpcb;
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lpcb_prev = prev;
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}
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#else /* SO_REUSE */
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if (ip_addr_cmp(&(lpcb->local_ip), &(iphdr->dest)) ||
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ip_addr_isany(&(lpcb->local_ip))) {
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/* found a match */
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break;
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}
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#endif /* SO_REUSE */
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}
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prev = (struct tcp_pcb *)lpcb;
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}
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#if SO_REUSE
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/* first try specific local IP */
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if (lpcb == NULL) {
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/* only pass to ANY if no specific local IP has been found */
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lpcb = lpcb_any;
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prev = lpcb_prev;
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}
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#endif /* SO_REUSE */
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if (lpcb != NULL) {
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/* Move this PCB to the front of the list so that subsequent
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lookups will be faster (we exploit locality in TCP segment
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arrivals). */
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@ -241,8 +271,6 @@ tcp_input(struct pbuf *p, struct netif *inp)
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pbuf_free(p);
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return;
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}
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prev = (struct tcp_pcb *)lpcb;
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}
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}
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#if TCP_INPUT_DEBUG
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