How to modify linklocal address of an ethernet interface

[Murali Annamneni <a.murali@xxxxxxx>]

Hi,

 

I have written a sample code to modify the link-local address of an Ethernet interface.

The code snippet is –

 

    while(1) {

        printf("\n1.Add Link Local\n2.Modify LinkLocal\n”);

        scanf("%d", &ch);

        switch(ch) {

            case 1:

            {

                add_linklocaladdr(fd, NLM_F_CREATE|NLM_F_EXCL);

                break;

            }

            case 2:

            {

                add_linklocaladdr(fd, NLM_F_REPLACE);

                break;

            }

-------------

-------------

void add_linklocaladdr(int fd, int flags)) {

-------------

-------------

    nlh = (struct nlmsghdr *)buf;

    len = MSG_ALIGN(sizeof(struct nlmsghdr));

    nlh->nlmsg_len   = len;

    nlh->nlmsg_type  = RTM_NEWADDR;

    nlh->nlmsg_flags = NLM_F_REQUEST | flag;

    nlh->nlmsg_seq = 1;

 

    ifadr = nlmsg_put_extra_header(nlh, sizeof(struct ifaddrmsg));

    ifadr->ifa_family    = AF_INET6;

    ifadr->ifa_prefixlen = 0x40 ; /*hardcoded*/

    ifadr->ifa_flags     = IFA_F_PERMANENT;;

    ifadr->ifa_scope     = RT_SCOPE_HOST;

    ifadr->ifa_index     = 2;

 

    /*Push ‘struct nlattr’ */

    attr_put(nlh, IFA_ADDRESS, dst);

 

When I execute case 1 (add link-local), a new ipv6 ip is getting added.

I want to modify an existing link local address in case2, but it’s not working.

Can anybody help me correcting this code for case2.

 

 

Thanks & Regards

Murali Annamneni

 

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