Hi,

I am currently porting an application from IPv4 to IPv6. The older
code uses some raw IPV4 packets with a structure defined as

struct
{
struct iphdr ip;
struct tcphdr tcp;
} pkt;

However to replace the above structure for IPv6 I can see two
structures available, "struct ipv6hdr" and "struct ip6_hdr". The later
one doesnt seem to be a complete fit as it doesnt seem to have all the
required fields of IPv6. Can anyone suggest which one to use.

When I use ipv6hdr and include the corresponding files

#include <netinet/ip6.h>
#include <linux/ipv6.h>

I get a compilation error as redefinition of in6_addr.

Also I read that we may not need the following code with IPv6.

ret = setsockopt(s, SOL_IP, IP_HDRINCL, &one, sizeof(one));

Any suggestions?

Thanks in advance

On Sep 28, 12:11 am, Manish Katiyar <mkati...@gmail.com> wrote:
> Hi,
>
> I am currently porting an application from IPv4 to IPv6. The older
> code uses some raw IPV4 packets with a structure defined as
>
> struct
> {
> struct iphdr ip;
> struct tcphdr tcp;
> } pkt;
>
> However to replace the above structure for IPv6 I can see two
> structures available, "struct ipv6hdr" and "struct ip6_hdr". The later
> one doesnt seem to be a complete fit as it doesnt seem to have all the
> required fields of IPv6. Can anyone suggest which one to use.
>
> When I use ipv6hdr and include the corresponding files
>
> #include <netinet/ip6.h>
> #include <linux/ipv6.h>
>
> I get a compilation error as redefinition of in6_addr.
>
> Also I read that we may not need the following code with IPv6.
>
> ret = setsockopt(s, SOL_IP, IP_HDRINCL, &one, sizeof(one));
>
> Any suggestions?
>
> Thanks in advance

Which version of Linux is this ?

If you are just porting an application, I think it is a good idea to
just
include <netinet/ip6.h> and use the structure struct ip6_hdr{} defined
in
it. If you want to use the structure struct in6_pktinfo{} use the
definition
from <netinet/in.h>

<linux/ipv6.h> should mostly be used from inside the kernel, from what
I
understand.

--Debashis