[lwip-devel] [bug #42998] The netif hardware adddress length need to be changed.

[任海波]

URL:
  <http://savannah.nongnu.org/bugs/?42998>

                 Summary: The netif hardware adddress length need to be
changed.
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: hichard
            Submitted on: Sat Aug 16 06:11:30 2014
                Category: None
                Severity: 3 - Normal
              Item Group: Change Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

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Details:

Hello:
     I have used lwip IPv6 for a long time. I find some problem which strongly
recommended to make modification.
     Some code in the file netif.h as follow:
/** must be the maximum of all used hardware address lengths
    across all types of interfaces in use */
#define NETIF_MAX_HWADDR_LEN 6U
    This macro definition may be defined in the file opt.h and lwipopts.h.
Why? Recently, I use lwip IPv6 to IEEE 802.15.4. In Ieee 802.15.4, the MAC
Address is 8 byte length. First, I try to use the 802.15.4 as Virtual
Ethernet， But it can't comuniticate with contiki. Contiki is a OS for IEEE
802.15.4 using for 6lowpan. This is because Neighbor discovery protocol not
compatible.
    Modification the NETIF_MAX_HWADDR_LEN for a configurition can let lwip to
support ieee 802.15.4.
   The follow code in the file nd6.h.
PACK_STRUCT_BEGIN
struct lladdr_option {
  PACK_STRUCT_FIELD(u8_t type);
  PACK_STRUCT_FIELD(u8_t length);
  PACK_STRUCT_FIELD(u8_t addr[NETIF_MAX_HWADDR_LEN]);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/epstruct.h"
#endif
The code in nd6.c which is relevant to struct lladdr_option also need to be
changed. Because the length in struct lladdr_option may be variable.






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