[Libct] Regarding network namespaces.

[Monali Porob]

Hi Andrew ,
While trying things with network namespaces , I tried  to use the libct_net_dev_add_ip_addr() in the test/ct_net_veth.c  and found the callback is not getting spawned.
The test program exits with main:89: FAIL: CT is not alive . How should I use this api . I am assuming that the api can be used to set the IP address for the veth0 inside the namespace.  Correct me here if that's not the case.
I have limited background of libnl.

I did try executing shell commands like ifconfig and setting up ip addresses on veth pairs. With this I could get the namespace communication set to the outside world using Routes .
I was wondering if libct APIs could be used to do the same . Hence tried using libct_net_dev_add_ip_addr(). Please suggest .

Thanks and Regards,
Monali

Changed ct_net_veth.c
int main(int argc, char **argv)
{
        int p[2];
        struct ct_arg ca;
        libct_session_t s;
        ct_handler_t ct;
        ct_process_desc_t pd;
        ct_process_t pr;
        struct ct_net_veth_arg va;
        ct_net_t nd;

        ca.mark = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
                        MAP_SHARED | MAP_ANON, 0, 0);
        pipe(p);

        ca.mark[0] = 0;
        ca.mark[1] = 0;
        ca.mark[2] = 0;
        ca.wait_pipe = p[0];

        va.host_name = VETH_HOST_NAME;
        va.ct_name = VETH_CT_NAME;

        s = libct_session_open_local();
        ct = libct_container_create(s, "test");
        pd = libct_process_desc_create(s);
        libct_container_set_nsmask(ct, CLONE_NEWNET);

        nd = libct_net_add(ct, CT_NET_VETH, &va);
        if (libct_handle_is_err(nd))
                return tst_err("Can't add hostnic");

        if (libct_net_dev_set_mac_addr(nd, "00:11:22:33:44:55"))
                return tst_err("Can't set mac");

                //Added by Monali
        if (libct_net_dev_add_ip_addr(nd, "VETH_CT_ADDR"))
                return tst_err("Can't set addr");

        pr = libct_container_spawn_cb(ct, pd, check_ct_net, &ca);
        if (libct_handle_is_err(pr))
                return tst_err("Can't spawn CT");

...Same as in git

}
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