Exemple #1
0
int main(int argc, char const *argv[])
{
	route_entry cur_rte1, cur_rte2;
	interface cif;
	int res;

	cif.ifnumber = 2;
	cur_rte1.dst = inet_addr("192.168.201.0") ;
	cur_rte1.genmask = inet_addr("255.255.255.0");
	cur_rte1.gateway = inet_addr("10.103.240.202");
	cur_rte1.metric = 1;

	cur_rte1.recvif = &cif;

	cur_rte2.dst = inet_addr("192.168.201.0") ;
	cur_rte2.genmask = inet_addr("255.255.255.0");
	cur_rte2.gateway = inet_addr("10.103.240.202");
	cur_rte2.metric = 2;

	cur_rte2.recvif = &cif;

	//res = kernel_route(ROUTE_ADD, &cur_rte1, NULL);
	//res = kernel_route(ROUTE_MOD, &cur_rte1, &cur_rte2);
	res = kernel_route(ROUTE_DEL, &cur_rte2, NULL);
	printf("res = %d\n", res);
	return 0;
}
Exemple #2
0
static int
del_route(const struct zone *zone, const struct babel_route *route)
{
    int table = find_table(zone->dst_prefix, zone->dst_plen,
                           zone->src_prefix, zone->src_plen);
    return kernel_route(ROUTE_FLUSH, table, zone->dst_prefix, zone->dst_plen,
                        zone->src_prefix, zone->src_plen,
                        route->nexthop,
                        route->neigh->ifp->ifindex,
                        metric_to_kernel(route_metric(route)), NULL, 0, 0, 0);
}
Exemple #3
0
void
uninstall_route(struct babel_route *route)
{
    int rc;

    if(!route->installed)
        return;

    rc = kernel_route(ROUTE_FLUSH, route->src->prefix, route->src->plen,
                      route->nexthop,
                      route->neigh->ifp->ifindex,
                      metric_to_kernel(route_metric(route)), NULL, 0, 0);
    if(rc < 0)
        flog_err(EC_BABEL_ROUTE, "kernel_route(FLUSH): %s",
		  safe_strerror(errno));

    route->installed = 0;
}
Exemple #4
0
void
uninstall_route(struct route *route)
{
    int rc;

    if(!route->installed)
        return;

    rc = kernel_route(ROUTE_FLUSH, route->src->prefix, route->src->plen,
                      route->nexthop,
                      route->neigh->ifp->ifindex,
                      metric_to_kernel(route_metric(route)), NULL, 0, 0);
    if(rc < 0)
        perror("kernel_route(FLUSH)");

    route->installed = 0;
    local_notify_route(route, LOCAL_CHANGE);
}
Exemple #5
0
void
install_route(struct babel_route *route)
{
    int i, rc;

    if(route->installed)
        return;

    if(!route_feasible(route))
        flog_err(EC_BABEL_ROUTE, "WARNING: installing unfeasible route "
                  "(this shouldn't happen).");

    i = find_route_slot(route->src->prefix, route->src->plen, NULL);
    assert(i >= 0 && i < route_slots);

    if(routes[i] != route && routes[i]->installed) {
        flog_err(EC_BABEL_ROUTE,
		  "WARNING: attempting to install duplicate route "
                  "(this shouldn't happen).");
        return;
    }

    rc = kernel_route(ROUTE_ADD, route->src->prefix, route->src->plen,
                      route->nexthop,
                      route->neigh->ifp->ifindex,
                      metric_to_kernel(route_metric(route)), NULL, 0, 0);
    if(rc < 0) {
        int save = errno;
        flog_err(EC_BABEL_ROUTE, "kernel_route(ADD): %s",
		  safe_strerror(errno));
        if(save != EEXIST)
            return;
    }
    route->installed = 1;
    move_installed_route(route, i);

}
Exemple #6
0
void
install_route(struct route *route)
{
    int i, rc;

    if(route->installed)
        return;

    if(!route_feasible(route))
        fprintf(stderr, "WARNING: installing unfeasible route "
                "(this shouldn't happen).");

    i = find_route_slot(route->src->prefix, route->src->plen, NULL);
    assert(i >= 0 && i < route_slots);

    if(routes[i] != route && routes[i]->installed) {
        fprintf(stderr, "WARNING: attempting to install duplicate route "
                "(this shouldn't happen).");
        return;
    }

    rc = kernel_route(ROUTE_ADD, route->src->prefix, route->src->plen,
                      route->nexthop,
                      route->neigh->ifp->ifindex,
                      metric_to_kernel(route_metric(route)), NULL, 0, 0);
    if(rc < 0) {
        int save = errno;
        perror("kernel_route(ADD)");
        if(save != EEXIST)
            return;
    }
    route->installed = 1;
    move_installed_route(route, i);

    local_notify_route(route, LOCAL_CHANGE);
}
int
kernel_route(int operation, const unsigned char *dest, unsigned short plen,
             const unsigned char *gate, int ifindex, unsigned int metric,
             const unsigned char *newgate, int newifindex,
             unsigned int newmetric)
{
    struct {
      struct rt_msghdr m_rtm;
      char m_space[512];
    } msg;
    char *data = msg.m_space;
    int rc, ipv4;

    char local6[1][1][16] = IN6ADDR_LOOPBACK_INIT;
    char local4[1][1][16] =
        {{{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x7f, 0x00, 0x00, 0x01 }}};

    /* Check that the protocol family is consistent. */
    if(plen >= 96 && v4mapped(dest)) {
        if(!v4mapped(gate)) {
            errno = EINVAL;
            return -1;
        }
        ipv4 = 1;
    } else {
        if(v4mapped(gate)) {
            errno = EINVAL;
            return -1;
        }
        ipv4 = 0;
    }

    if(operation == ROUTE_MODIFY && newmetric == metric && 
       memcmp(newgate, gate, 16) == 0 && newifindex == ifindex)
      return 0;


    if(operation == ROUTE_MODIFY) {

        /* Avoid atomic route changes that is buggy on OS X. */
        kernel_route(ROUTE_FLUSH, dest, plen,
                     gate, ifindex, metric,
                     NULL, 0, 0);
        return kernel_route(ROUTE_ADD, dest, plen,
                            newgate, newifindex, newmetric,
                            NULL, 0, 0);

    }

    kdebugf("kernel_route: %s %s/%d metric %d dev %d nexthop %s\n",
            operation == ROUTE_ADD ? "add" :
            operation == ROUTE_FLUSH ? "flush" : "change",
            format_address(dest), plen, metric, ifindex,
            format_address(gate));

    if(kernel_socket < 0) kernel_setup_socket(1);

    memset(&msg, 0, sizeof(msg));
    msg.m_rtm.rtm_version = RTM_VERSION;
    switch(operation) {
    case ROUTE_FLUSH:
        msg.m_rtm.rtm_type = RTM_DELETE; break;
    case ROUTE_ADD:
        msg.m_rtm.rtm_type = RTM_ADD; break;
    case ROUTE_MODIFY:
        msg.m_rtm.rtm_type = RTM_CHANGE; break;
    default:
        return -1;
    };
    msg.m_rtm.rtm_index = ifindex;
    msg.m_rtm.rtm_flags = RTF_UP | RTF_PROTO2;
    if(plen == 128) msg.m_rtm.rtm_flags |= RTF_HOST;
    if(metric == KERNEL_INFINITY) {
        msg.m_rtm.rtm_flags |= RTF_BLACKHOLE;
        if(ifindex_lo < 0) {
            ifindex_lo = if_nametoindex("lo0");
            if(ifindex_lo <= 0)
                return -1;
        }
        msg.m_rtm.rtm_index = ifindex_lo;
    }
    msg.m_rtm.rtm_seq = ++seq;
    msg.m_rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
    if(plen != 128) msg.m_rtm.rtm_addrs |= RTA_NETMASK;

#define PUSHEUI(ifindex) \
    do { char ifname[IFNAMSIZ]; \
         struct sockaddr_dl *sdl = (struct sockaddr_dl*) data; \
         if(!if_indextoname((ifindex), ifname))  \
             return -1; \
         if(get_sdl(sdl, ifname) < 0)   \
             return -1; \
         data = data + ROUNDUP(sdl->sdl_len); \
    } while (0)

#define PUSHADDR(src) \
    do { struct sockaddr_in *sin = (struct sockaddr_in*) data; \
         sin->sin_len = sizeof(struct sockaddr_in);  \
         sin->sin_family = AF_INET; \
         memcpy(&sin->sin_addr, (src) + 12, 4); \
         data = data + ROUNDUP(sin->sin_len); \
    } while (0)

#define PUSHADDR6(src) \
    do { struct sockaddr_in6 *sin6 = (struct sockaddr_in6*) data; \
         sin6->sin6_len = sizeof(struct sockaddr_in6); \
         sin6->sin6_family = AF_INET6; \
         memcpy(&sin6->sin6_addr, (src), 16); \
         if(IN6_IS_ADDR_LINKLOCAL (&sin6->sin6_addr)) \
            SET_IN6_LINKLOCAL_IFINDEX (sin6->sin6_addr, ifindex); \
         data = data + ROUNDUP(sin6->sin6_len); \
    } while (0)

    /* KAME ipv6 stack does not support IPv4 mapped IPv6, so we have to
     * duplicate the codepath */
    if(ipv4) {

        PUSHADDR(dest);
        if (metric == KERNEL_INFINITY) {
            PUSHADDR(**local4);
        } else if(plen == 128 && memcmp(dest+12, gate+12, 4) == 0) {
#if defined(RTF_CLONING)
            msg.m_rtm.rtm_flags |= RTF_CLONING;
#endif
            PUSHEUI(ifindex);
        } else {
            msg.m_rtm.rtm_flags |= RTF_GATEWAY;
            PUSHADDR(gate);
        }
        if((msg.m_rtm.rtm_addrs & RTA_NETMASK) != 0) {
            struct in6_addr tmp_sin6_addr;
            plen2mask(plen, &tmp_sin6_addr);
            PUSHADDR((char *)&tmp_sin6_addr);
        }

    } else {

        PUSHADDR6(dest);
        if (metric == KERNEL_INFINITY) {
            PUSHADDR6(**local6);
        } else {
            msg.m_rtm.rtm_flags |= RTF_GATEWAY;
            PUSHADDR6(gate);
        }
        if((msg.m_rtm.rtm_addrs & RTA_NETMASK) != 0) {
            struct in6_addr tmp_sin6_addr;
            plen2mask(plen, &tmp_sin6_addr);
            PUSHADDR6((char*)&tmp_sin6_addr);
        }

    }

#undef PUSHEUI
#undef PUSHADDR
#undef PUSHADDR6

    msg.m_rtm.rtm_msglen = data - (char *)&msg;
    rc = write(kernel_socket, (char*)&msg, msg.m_rtm.rtm_msglen);
    if (rc < msg.m_rtm.rtm_msglen)
        return -1;

    return 1;
}
Exemple #8
0
int
kernel_route(int operation, const unsigned char *dest, unsigned short plen,
             const unsigned char *gate, int ifindex, unsigned int metric,
             const unsigned char *newgate, int newifindex,
             unsigned int newmetric)
{

    union { char raw[1024]; struct nlmsghdr nh; } buf;
    struct rtmsg *rtm;
    struct rtattr *rta;
    int len = sizeof(buf.raw);
    int rc, ipv4;

    if(!nl_setup) {
        fprintf(stderr,"kernel_route: netlink not initialized.\n");
        errno = EIO;
        return -1;
    }

    /* if the socket has been closed after an IO error, */
    /* we try to re-open it. */
    if(nl_command.sock < 0) {
        rc = netlink_socket(&nl_command, 0);
        if(rc < 0) {
            int olderrno = errno;
            perror("kernel_route: netlink_socket()");
            errno = olderrno;
            return -1;
        }
    }

    /* Check that the protocol family is consistent. */
    if(plen >= 96 && v4mapped(dest)) {
        if(!v4mapped(gate)) {
            errno = EINVAL;
            return -1;
        }
    } else {
        if(v4mapped(gate)) {
            errno = EINVAL;
            return -1;
        }
    }

    ipv4 = v4mapped(gate);

    if(operation == ROUTE_MODIFY) {
        if(newmetric == metric && memcmp(newgate, gate, 16) == 0 &&
           newifindex == ifindex)
            return 0;
        /* It would be better to add the new route before removing the
           old one, to avoid losing packets.  However, this causes
           problems with non-multipath kernels, which sometimes
           silently fail the request, causing "stuck" routes.  Let's
           stick with the naive approach, and hope that the window is
           small enough to be negligible. */
        kernel_route(ROUTE_FLUSH, dest, plen,
                     gate, ifindex, metric,
                     NULL, 0, 0);
        rc = kernel_route(ROUTE_ADD, dest, plen,
                          newgate, newifindex, newmetric,
                          NULL, 0, 0);
        if(rc < 0) {
            if(errno == EEXIST)
                rc = 1;
            /* Should we try to re-install the flushed route on failure?
               Error handling is hard. */
        }
        return rc;
    }

    kdebugf("kernel_route: %s %s/%d metric %d dev %d nexthop %s\n",
           operation == ROUTE_ADD ? "add" :
           operation == ROUTE_FLUSH ? "flush" : "???",
           format_address(dest), plen, metric, ifindex,
           format_address(gate));

    /* Unreachable default routes cause all sort of weird interactions;
       ignore them. */
    if(metric >= KERNEL_INFINITY && (plen == 0 || (ipv4 && plen == 96)))
        return 0;

    memset(buf.raw, 0, sizeof(buf.raw));
    if(operation == ROUTE_ADD) {
        buf.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
        buf.nh.nlmsg_type = RTM_NEWROUTE;
    } else {
        buf.nh.nlmsg_flags = NLM_F_REQUEST;
        buf.nh.nlmsg_type = RTM_DELROUTE;
    }

    rtm = NLMSG_DATA(&buf.nh);
    rtm->rtm_family = ipv4 ? AF_INET : AF_INET6;
    rtm->rtm_dst_len = ipv4 ? plen - 96 : plen;
    rtm->rtm_table = export_table;
    rtm->rtm_scope = RT_SCOPE_UNIVERSE;
    if(metric < KERNEL_INFINITY)
        rtm->rtm_type = RTN_UNICAST;
    else
        rtm->rtm_type = RTN_UNREACHABLE;
    rtm->rtm_protocol = RTPROT_BABEL;
    rtm->rtm_flags |= RTNH_F_ONLINK;

    rta = RTM_RTA(rtm);

    if(ipv4) {
        rta = RTA_NEXT(rta, len);
        rta->rta_len = RTA_LENGTH(sizeof(struct in_addr));
        rta->rta_type = RTA_DST;
        memcpy(RTA_DATA(rta), dest + 12, sizeof(struct in_addr));
    } else {
        rta = RTA_NEXT(rta, len);
        rta->rta_len = RTA_LENGTH(sizeof(struct in6_addr));
        rta->rta_type = RTA_DST;
        memcpy(RTA_DATA(rta), dest, sizeof(struct in6_addr));
    }

    rta = RTA_NEXT(rta, len);
    rta->rta_len = RTA_LENGTH(sizeof(int));
    rta->rta_type = RTA_PRIORITY;

    if(metric < KERNEL_INFINITY) {
        *(int*)RTA_DATA(rta) = metric;
        rta = RTA_NEXT(rta, len);
        rta->rta_len = RTA_LENGTH(sizeof(int));
        rta->rta_type = RTA_OIF;
        *(int*)RTA_DATA(rta) = ifindex;

        if(ipv4) {
            rta = RTA_NEXT(rta, len);
            rta->rta_len = RTA_LENGTH(sizeof(struct in_addr));
            rta->rta_type = RTA_GATEWAY;
            memcpy(RTA_DATA(rta), gate + 12, sizeof(struct in_addr));
        } else {
            rta = RTA_NEXT(rta, len);
            rta->rta_len = RTA_LENGTH(sizeof(struct in6_addr));
            rta->rta_type = RTA_GATEWAY;
            memcpy(RTA_DATA(rta), gate, sizeof(struct in6_addr));
        }
    } else {
        *(int*)RTA_DATA(rta) = -1;
    }
    buf.nh.nlmsg_len = (char*)rta + rta->rta_len - buf.raw;

    return netlink_talk(&buf.nh);
}