routing.c

#include "routing.h"

// initialize the routing structure to do it directly from here
int routing_init(struct config *c, char *tun_name) {
    FILE *fd;
    char buf[256];
    my_short_addr = ntohs(__my_address.s6_addr16[7]);
    strncpy(proxy_dev, c->proxy_dev, IFNAMSIZ);
    strncpy(tun_dev, tun_name, IFNAMSIZ);

    // set up the network state data structures
    nw_init();

    // start a netlink session to the kernel
    nl_init();

    mcast_sock = mcast_start(proxy_dev);;

    if ((fd = fopen("/proc/sys/net/ipv6/conf/all/forwarding", "w")) == NULL) {
        log_fatal_perror("enable forwarding");
        return -1;
    }
    fprintf(fd, "1");
    fclose(fd);

    snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/proxy_ndp", proxy_dev);
    if ((fd = fopen(buf, "w")) == NULL) {
        warn("unable to enable IPv6 ND proxy on %s\n", proxy_dev);
    } else {
        fprintf(fd, "1");
        fclose(fd);
    }

    if ((fd = fopen("/var/run/ip-driver.seq", "r")) != NULL) {
        if (fscanf(fd, "%hi\n", &current_seqno) != 1) {
            current_seqno = 0;
        }
        fclose(fd);
    }

    return (mcast_sock >= 0) ? 0 : -1;
}