[lwip-devel] [bug #55171] Binding UDP PCB with different IP type PCBs does not work

[Dirk Ziegelmeier]

URL:
  <https://savannah.nongnu.org/bugs/?55171>

                 Summary: Binding UDP PCB with different IP type PCBs does not
work
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dziegel
            Submitted on: Thu 06 Dec 2018 01:39:55 PM UTC
                Category: UDP
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: dziegel
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

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Details:

reported by Email from Stian Skjelstad:

Hi

I just updated my code to the recent master, and this commit breaks my code:

I have two UDP sockets listening at the same port. One a IPv4 only PCB, and
when trying to listen with an IPv6 only PCB at the same port, it fails.

from udp.c after this commit:
    for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
...
          if ((ipcb->local_port == port) &&
              (ip_addr_cmp(&ipcb->local_ip, ipaddr) || ip_addr_isany(ipaddr)
||
              ip_addr_isany(&ipcb->local_ip)))
            return ERR_USE;
....


ip_addr_isany should be IP_IS_ANY_TYPE_VAL instead, so that it only hits
dual-stack listeners?




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