Libmnl - Adding IPv6 Address in the interface

[Khawar Shehzad <shehzad.khawar@xxxxxxxxx>]

Hi,
I hope all are fine.
You can view my question here as well ( 
http://stackoverflow.com/questions/39183969/adding-an-ipv6-address-to-the-interface-using-libmnl-and-rtnetlink 
)

I am trying to add an IPv6 address to an ethernet interface, using 
libmnl. After constructing a message and sending to the kernel, I saw 
that it was not added to the interface, even though the return codes for 
the kernel reply did not contain any error. Kindly can anybody have a 
look, and help me correct it. Am I supposed to add more attributes to 
the nlmsghdr or something else?


    #include <assert.h>
    #include <string.h>
    #include <inttypes.h>
    #include <sys/socket.h>
    #include <arpa/inet.h>
    #include <libmnl/libmnl.h>
    #include <linux/rtnetlink.h>
    #include <net/if.h>
    #include <time.h>
    static struct mnl_socket *nl;
    static unsigned int nlportid;

    int mnl_init(void);
    int mnl_init(){
        nl = mnl_socket_open(NETLINK_ROUTE);
        if(nl == NULL){
            printf("Error: mnl_socket_open\n");
            return 0;
        }
        if(mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0){
            printf("Error: mnl_socket_bind\n");
            return 0;
        }
        nlportid = mnl_socket_get_portid(nl);
        return 1;
    }
    int add_to_interface(const char* eip){
        char buf[MNL_SOCKET_BUFFER_SIZE];
        struct nlmsghdr *nlh;
        struct ifaddrmsg *ifm;
        int ret;
        uint8_t seq;

        nlh = mnl_nlmsg_put_header(buf);

        nlh->nlmsg_type = RTM_NEWADDR;
        nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_EXCL;
        nlh->nlmsg_seq = seq = time(NULL);

        ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm));

        ifm->ifa_family = AF_INET6;
        ifm->ifa_prefixlen = 64;
        ifm->ifa_flags = IFA_F_PERMANENT;
        ifm->ifa_scope = RT_SCOPE_UNIVERSE;
        /* TODO get interaface name from user or configuration*/
        ifm->ifa_index = if_nametoindex("eth0");
        unsigned char eipn[16];
        inet_pton(AF_INET6, eip, eipn);
        mnl_attr_put(nlh, IFA_ADDRESS, 16,eipn);

        mnl_nlmsg_fprintf(stdout, nlh, nlh->nlmsg_len, sizeof(struct 
ifaddrmsg));

        if(mnl_socket_sendto(nl,nlh, nlh->nlmsg_len) < 0){
            printf("Error: mnl_socket_sendto");
            return 0;
        }
        ret = mnl_socket_recvfrom(nl,buf, sizeof(buf));
        if(ret == -1){
            printf("Error: mnl_socket_recvfrom");
            return 0;
        }
        ret = mnl_cb_run(buf, ret, seq, nlportid, NULL, NULL);
        return 0;
    }

    int main(int argc, char *argv[]){
        if(mnl_init()){
            add_to_interface("2001::20c:29ff:fe5f:13c7/64"); // for testing
        }
    }

Any help will be much appreciated.
Cheers,
Khawar

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