[lwip-devel] [bug #53273] IPv6 link-local address generation for non-ethernet type netif does not convert byte order

[hongchengyan]

URL:
  <http://savannah.nongnu.org/bugs/?53273>

                 Summary: IPv6 link-local address generation for non-ethernet
type netif does not convert byte order
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: yanhc
            Submitted on: Sat 03 Mar 2018 02:29:21 PM UTC
                Category: IPv6
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.0.2

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Details:

netif_create_ip6_linklocal_address in netif.c does not convert byte order for
non-ethernet type netif. I found this problem in x86 platform which is little
endian.
I add the lwip_htonl conversion in the following codes.

addr_index = 3;
    for (i = 0; (i < 8) && (i < netif->hwaddr_len); i++) {
      if (i == 4) {
        addr_index--;
      }
      ip_2_ip6(&netif->ip6_addr[0])->addr[addr_index] |= lwip_htonl(
((u32_t)(netif->hwaddr[netif->hwaddr_len - i - 1])) << (8 * (i & 0x03)) );
    }

I have checked the latest 2.0.3. This problem is still there.




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