Re: [lwip-users] IPV6 Porting

[Ivan Delamer]

struct netif stores an array of ipv6 adresses in netif->ip6_addr[i]

You can also access those addresses via macro netif_ip6_addr(netif, i)

You may set any of those addresses manually, keeping in mind that index 
0 should be a link-local address.

One way to do it is to set a local variable and then copy it to netif. 
Or you can set it directly on netif struct.

Remember that addresses must be stored in network byte order, for that 
reason it helps to use macros that take care of byte ordering. Otherwise 
you can use htonl().

For example, to set fe80::1, do this

{
  ip6_addr_t my_addr;

  IP6_ADDR(&my_addr, 0, 0xFE, 0x80, 0x00, 0x00);
  IP6_ADDR(&my_addr, 1, 0x00, 0x00, 0x00, 0x00);
  IP6_ADDR(&my_addr, 2, 0x00, 0x00, 0x00, 0x00);
  IP6_ADDR(&my_addr, 3, 0x00, 0x00, 0x00, 0x01);

  ip6_addr_copy(netif->ip6_addr[0], my_addr);

  netif_ip6_addr_set_state(netif, 0, IP6_ADDR_TENTATIVE);
}


The last step, setting the state, is important for ND6 protocol to 
validate the address (e.g. no duplicate address in network).

You could use this process to set any address, if it is not link local 
use an index other than 0 in netif.

Cheers
Ivan



> Date: Sun, 27 Jul 2014 16:35:03 +0800
> From: "=?ISO-8859-1?B?ZmZkZHlieg==?=" <address@hidden>
> To: "=?ISO-8859-1?B?TWFpbGluZyBsaXN0IGZvciBsd0lQIHVzZXJz?="
>         <address@hidden>, "=?ISO-8859-1?B?bHdpcC11c2Vycw==?="
>         <address@hidden>
> Subject: Re: [lwip-users] IPV6 Porting
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Thank you for your reply. I succeed in testing IPV6 via ND6 protocol.
> But I also want to test it using static IPV6 address, the process of
> doing this, I created linklocal address, then I use IP6_ADDR macro to
> add address to struct ip6addr, I use function netif_get_ip6_addr_match
> to bind struct netif and struct ip6_addr, Then you tell me using macro
> netif_ip6_addr_set_state. But I can't create IPV6 address, and struct
> netif did not contain any information about IPV6 address. Am I doing
> right?
>
>
>
>
> ------------------ Original ------------------
> From: "Ivan Delamer";
> Date: Tuesday, Jul 22, 2014 2:20 AM
> To: "lwip-users";
> Subject: Re: [lwip-users] IPV6 Porting
>
>
>
> This used to be in one of the LwIP Wikia pages but now it is gone ...
> ??
>
> The netif has some placeholders for IPv6 addresses:
> my_netif->ip6_addr[xx]. The number of addresses is configurable in
> lwipopts.h, usually 3 is a good number.
>
> Usually address [0] is reserved for the link-local address. If your
> netif has a hw_addr configured you can use
> netif_create_ip6_linklocal_address() to create the address. You can
> manually create the rest of the adresses, or if you have adress
> auto-configuration enabled you can let the ND6 protocol generate the
> rest of the adresses with help from your IPv6 router. you should set
> netif->ip6_autoconfig_enabled = 1; and make sure it is enabled in
> lwipopts.h
>
> Any address you manually configure, you should use the macro
> netif_ip6_addr_set_state(netif, addr_index, IP6_ADDR_TENTATIVE) to let
> ND6 protocol validate it.
>
> That is all you need to get set up.
>
> If you have any other questions just ask.
>
> Cheers
> Ivan
>
>
>
> > Date: Sun, 20 Jul 2014 15:22:12 +0800
> > From: "=?ISO-8859-1?B?ZmZkZHlieg==?=" <address@hidden>
> > To: "=?ISO-8859-1?B?bHdpcC11c2Vycw==?=" <address@hidden>
> > Subject: [lwip-users] IPV6 Porting
> > Message-ID: <address@hidden>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hi,everyone. I try to port lwip-master to RT-Thread Operating
> > System(An embedded Real-Time open source system form china).I succeed
> > in running IPV4 application, but the main purpose for me is porting
> > IPV6 to it.
> > The wiki said that when you using ipv6 you can add macro LWIP_IPV6 in
> > lwipopts.h
> > But I don't know how to call some functions to set static IPV6
> > address. Is there any documents talking about it?
>
>
> _______________________________________________
> lwip-users mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/lwip-users