static struct olsr_gw_handler *gw_handler;
/** the IPv4 gateway list */
-static struct gw_list gw_list_ipv4;
+struct gw_list gw_list_ipv4;
/** the IPv6 gateway list */
-static struct gw_list gw_list_ipv6;
+struct gw_list gw_list_ipv6;
/** the current IPv4 gateway */
static struct gw_container_entry *current_ipv4_gw;
/** interface names for smart gateway tunnel interfaces, IPv6 */
struct interfaceName * sgwTunnel6InterfaceNames;
+/** the timer for proactive takedown */
+static struct timer_entry *gw_takedown_timer;
+
/*
* Forward Declarations
*/
struct interfaceName * sgwTunnelInterfaceNames;
uint8_t i = 0;
+ if (!multi_gateway_mode()) {
+ return NULL;
+ }
+
assert(sgwTunnel4InterfaceNames);
assert(sgwTunnel6InterfaceNames);
assert(name);
assert(interfaceName);
+ memset(name, 0, IFNAMSIZ);
+
if (multi_gateway_mode()) {
struct interfaceName * ifn = find_interfaceName(NULL);
if (ifn) {
- ifn->gw = gw;
strncpy(&name[0], &ifn->name[0], sizeof(ifn->name));
*interfaceName = ifn;
+ ifn->gw = gw;
return;
}
/* do not return, fall-through to classic naming as fallback */
}
- memset(name, 0, IFNAMSIZ);
snprintf(name, IFNAMSIZ, "tnl_%08x", (olsr_cnf->ip_version == AF_INET) ? gw->originator.v4.s_addr : ++counter);
*interfaceName = NULL;
}
}
assert(gw);
- assert(sgwTunnel4InterfaceNames);
- assert(sgwTunnel6InterfaceNames);
ifn = find_interfaceName(gw);
if (ifn) {
/**
* Setup generic multi-gateway iptables and ip rules
*
- * - generic (on olsrd up/down)
+ * - generic (on olsrd start/stop)
* iptablesExecutable -t mangle -A OUTPUT -j CONNMARK --restore-mark
*
* @param add true to add policy routing, false to remove it
/**
* Setup multi-gateway iptables and ip rules for all OLSR interfaces.
*
- * - olsr interfaces (on olsrd up/down)
+ * - olsr interfaces (on olsrd start/stop)
* iptablesExecutable -t mangle -A PREROUTING -i ${olsrInterface} -j CONNMARK --restore-mark
*
* @param add true to add policy routing, false to remove it
/**
* Setup multi-gateway iptables and ip rules for the smart gateway server tunnel.
*
- * - sgw server tunnel interface (on olsrd up/down)
+ * - sgw server tunnel interface (on olsrd start/stop)
* iptablesExecutable -t mangle -A PREROUTING -i tunl0 -j CONNMARK --restore-mark
*
* @param add true to add policy routing, false to remove it
/**
* Setup multi-gateway iptables and ip rules for all egress interfaces.
*
- * - egress interfaces (on interface up/down)
+ * - egress interfaces (on interface start/stop)
* iptablesExecutable -t mangle -A POSTROUTING -m conntrack --ctstate NEW -o ${egressInterface} -j CONNMARK --set-mark ${egressInterfaceMark}
* iptablesExecutable -t mangle -A INPUT -m conntrack --ctstate NEW -i ${egressInterface} -j CONNMARK --set-mark ${egressInterfaceMark}
* ip rule add fwmark ${egressInterfaceMark} table ${egressInterfaceMark} pref ${egressInterfaceMark}
/**
* Setup multi-gateway iptables and ip rules for the smart gateway client tunnels.
*
- * - sgw tunnels (on sgw tunnel up/down)
+ * - sgw tunnels (on sgw tunnel start/stop)
* iptablesExecutable -t mangle -A POSTROUTING -m conntrack --ctstate NEW -o ${sgwTunnelInterface} -j CONNMARK --set-mark ${sgwTunnelInterfaceMark}
* ip rule add fwmark ${sgwTunnelInterfaceMark} table ${sgwTunnelInterfaceMark} pref ${sgwTunnelInterfaceMark}
*
olsr_cookie_free(gateway_entry_mem_cookie, gw);
}
+/**
+ * Remove a gateway from a gateway list.
+ *
+ * @param gw_list a pointer to the gateway list
+ * @param ipv4 true when dealing with an IPv4 gateway / gateway list
+ * @param gw a pointer to the gateway to remove from the list
+ */
+static void removeGatewayFromList(struct gw_list * gw_list, bool ipv4, struct gw_container_entry * gw) {
+ if (gw->tunnel) {
+ struct interfaceName * ifn = find_interfaceName(gw->gw);
+ if (ifn) {
+ olsr_os_inetgw_tunnel_route(gw->tunnel->if_index, ipv4, false, ifn->mark);
+ }
+ olsr_os_del_ipip_tunnel(gw->tunnel);
+ set_unused_iptunnel_name(gw->gw);
+ gw->tunnel = NULL;
+ }
+ gw->gw = NULL;
+ olsr_cookie_free(gw_container_entry_mem_cookie, olsr_gw_list_remove(gw_list, gw));
+}
+
+/**
+ * Remove expensive gateways from the gateway list.
+ * It uses the smart_gw_takedown_percentage configuration parameter
+ *
+ * @param gw_list a pointer to the gateway list
+ * @param ipv4 true when dealing with an IPv4 gateway / gateway list
+ * @param current_gw the current gateway
+ */
+static void takeDownExpensiveGateways(struct gw_list * gw_list, bool ipv4, struct gw_container_entry * current_gw) {
+ uint64_t current_gw_cost_boundary;
+
+ /*
+ * exit immediately when takedown is disabled, there is no current gateway, or
+ * when there is only a single gateway
+ */
+ if ((olsr_cnf->smart_gw_takedown_percentage == 0) || (current_gw == NULL ) || (gw_list->count <= 1)) {
+ return;
+ }
+
+ /* get the cost boundary */
+
+ /* scale down because otherwise the percentage calculation can overflow */
+ current_gw_cost_boundary = (current_gw->path_cost >> 2);
+
+ if (olsr_cnf->smart_gw_takedown_percentage < 100) {
+ current_gw_cost_boundary = (current_gw_cost_boundary * 100) / olsr_cnf->smart_gw_takedown_percentage;
+ }
+
+ /* loop while we still have gateways */
+ while (gw_list->count > 1) {
+ /* get the worst gateway */
+ struct gw_container_entry * worst_gw = olsr_gw_list_get_worst_entry(gw_list);
+
+ /* exit when it's the current gateway */
+ if (worst_gw == current_gw) {
+ return;
+ }
+
+ /*
+ * exit when it (and further ones; the list is sorted on costs) has lower
+ * costs than the boundary costs
+ */
+ if ((worst_gw->path_cost >> 2) < current_gw_cost_boundary) {
+ return;
+ }
+
+ /* it's is too expensive: take it down */
+ removeGatewayFromList(gw_list, ipv4, worst_gw);
+ }
+}
+
+/**
+ * Timer callback for proactive gateway takedown
+ *
+ * @param unused unused
+ */
+static void gw_takedown_timer_callback(void *unused __attribute__ ((unused))) {
+ takeDownExpensiveGateways(&gw_list_ipv4, true, current_ipv4_gw);
+ takeDownExpensiveGateways(&gw_list_ipv6, false, current_ipv6_gw);
+}
+
/*
* Main Interface
*/
* Initialize gateway system
*/
int olsr_init_gateways(void) {
+ int retries = 5;
+
gateway_entry_mem_cookie = olsr_alloc_cookie("gateway_entry_mem_cookie", OLSR_COOKIE_TYPE_MEMORY);
olsr_cookie_set_memory_size(gateway_entry_mem_cookie, sizeof(struct gateway_entry));
gw_handler = &gw_def_handler;
gw_handler->init();
- if (olsr_os_init_iptunnel(server_tunnel_name())) {
+
+ /*
+ * There appears to be a kernel bug in some kernels (at least in the 3.0
+ * Debian Squeeze kernel, but not in the Fedora 17 kernels) around
+ * initialising the IPIP server tunnel (loading the IPIP module), so we retry
+ * a few times before giving up
+ */
+ while (retries-- > 0) {
+ if (!olsr_os_init_iptunnel(server_tunnel_name())) {
+ retries = 5;
+ break;
+ }
+
+ olsr_printf(0, "Could not initialise the IPIP server tunnel, retrying %d more times\n", retries);
+ }
+ if (retries <= 0) {
return 1;
}
return 1;
}
+ if (olsr_cnf->smart_gw_takedown_percentage > 0) {
+ /* start gateway takedown timer */
+ olsr_set_timer(&gw_takedown_timer, olsr_cnf->smart_gw_period, 0, true, &gw_takedown_timer_callback, NULL, 0);
+ }
+
return 0;
}
return;
}
+ if (olsr_cnf->smart_gw_takedown_percentage > 0) {
+ /* stop gateway takedown timer */
+ olsr_stop_timer(gw_takedown_timer);
+ gw_takedown_timer = NULL;
+ }
+
(void)multiGwRulesSgwTunnels(false);
(void)multiGwRulesEgressInterfaces(false);
(void)multiGwRulesOlsrInterfaces(false);
* Cleanup gateway tunnel system
*/
void olsr_cleanup_gateways(void) {
- struct avl_node * avlnode = NULL;
+ struct gateway_entry * tree_gw;
struct gw_container_entry * gw;
olsr_remove_ifchange_handler(smartgw_tunnel_monitor);
/* remove all gateways in the gateway tree that are not the active gateway */
- while ((avlnode = avl_walk_first(&gateway_tree))) {
- struct gateway_entry* tree_gw = node2gateway(avlnode);
+ OLSR_FOR_ALL_GATEWAY_ENTRIES(tree_gw) {
if ((tree_gw != olsr_get_inet_gateway(false)) && (tree_gw != olsr_get_inet_gateway(true))) {
olsr_delete_gateway_tree_entry(tree_gw, FORCE_DELETE_GW_ENTRY, true);
}
- }
+ } OLSR_FOR_ALL_GATEWAY_ENTRIES_END(gw)
/* remove all active IPv4 gateways (should be at most 1 now) */
OLSR_FOR_ALL_GWS(&gw_list_ipv4.head, gw) {
void olsr_modifiy_inetgw_netmask(union olsr_ip_addr *mask, int prefixlen) {
uint8_t *ptr = hna_mask_to_hna_pointer(mask, prefixlen);
+ /* copy the current settings for uplink/downlink into the mask */
memcpy(ptr, &smart_gateway_netmask, sizeof(smart_gateway_netmask) - prefixlen / 8);
if (olsr_cnf->has_ipv4_gateway) {
ptr[GW_HNA_FLAGS] |= GW_HNA_FLAG_IPV4;
*/
void refresh_smartgw_netmask(void) {
uint8_t *ip;
+
+ /* clear the mask */
memset(&smart_gateway_netmask, 0, sizeof(smart_gateway_netmask));
if (olsr_cnf->smart_gw_active) {
ip = (uint8_t *) &smart_gateway_netmask;
- if (olsr_cnf->smart_gw_uplink > 0 && olsr_cnf->smart_gw_downlink > 0) {
- /* the link is bi-directional with a non-zero bandwidth */
- ip[GW_HNA_FLAGS] |= GW_HNA_FLAG_LINKSPEED;
- ip[GW_HNA_DOWNLINK] = serialize_gw_speed(olsr_cnf->smart_gw_downlink);
- ip[GW_HNA_UPLINK] = serialize_gw_speed(olsr_cnf->smart_gw_uplink);
- }
+ ip[GW_HNA_FLAGS] |= GW_HNA_FLAG_LINKSPEED;
+ ip[GW_HNA_DOWNLINK] = serialize_gw_speed(olsr_cnf->smart_gw_downlink);
+ ip[GW_HNA_UPLINK] = serialize_gw_speed(olsr_cnf->smart_gw_uplink);
+
if (olsr_cnf->ip_version == AF_INET6 && olsr_cnf->smart_gw_prefix.prefix_len > 0) {
ip[GW_HNA_FLAGS] |= GW_HNA_FLAG_IPV6PREFIX;
ip[GW_HNA_V6PREFIXLEN] = olsr_cnf->smart_gw_prefix.prefix_len;
}
/* handle IPv4 */
- if (ipv4 && new_gw->ipv4 && (!new_gw->ipv4nat || olsr_cnf->smart_gw_allow_nat) && (!current_ipv4_gw || current_ipv4_gw->gw != new_gw)) {
- /* new gw is different than the current gw */
+ if (ipv4 &&
+ new_gw->ipv4 &&
+ (!new_gw->ipv4nat || olsr_cnf->smart_gw_allow_nat) &&
+ (!current_ipv4_gw || current_ipv4_gw->gw != new_gw || current_ipv4_gw->path_cost != path_cost)) {
+ /* new gw is different than the current gw, or costs have changed */
struct gw_container_entry * new_gw_in_list = olsr_gw_list_find(&gw_list_ipv4, new_gw);
if (new_gw_in_list) {
struct gw_container_entry* worst = olsr_gw_list_get_worst_entry(&gw_list_ipv4);
assert(worst);
- if (worst->tunnel) {
- struct interfaceName * ifn = find_interfaceName(worst->gw);
- if (ifn) {
- olsr_os_inetgw_tunnel_route(worst->tunnel->if_index, true, false, ifn->mark);
- }
- olsr_os_del_ipip_tunnel(worst->tunnel);
- set_unused_iptunnel_name(worst->gw);
- worst->tunnel = NULL;
- }
- worst->gw = NULL;
- olsr_cookie_free(gw_container_entry_mem_cookie, olsr_gw_list_remove(&gw_list_ipv4, worst));
+ removeGatewayFromList(&gw_list_ipv4, true, worst);
}
get_unused_iptunnel_name(new_gw, name, &interfaceName);
}
/* handle IPv6 */
- if (ipv6 && new_gw->ipv6 && (!current_ipv6_gw || current_ipv6_gw->gw != new_gw)) {
- /* new gw is different than the current gw */
+ if (ipv6 &&
+ new_gw->ipv6 &&
+ (!current_ipv6_gw || current_ipv6_gw->gw != new_gw || current_ipv6_gw->path_cost != path_cost)) {
+ /* new gw is different than the current gw, or costs have changed */
struct gw_container_entry * new_gw_in_list = olsr_gw_list_find(&gw_list_ipv6, new_gw);
if (new_gw_in_list) {
struct gw_container_entry* worst = olsr_gw_list_get_worst_entry(&gw_list_ipv6);
assert(worst);
- if (worst->tunnel) {
- struct interfaceName * ifn = find_interfaceName(worst->gw);
- if (ifn) {
- olsr_os_inetgw_tunnel_route(worst->tunnel->if_index, false, false, ifn->mark);
- }
- olsr_os_del_ipip_tunnel(worst->tunnel);
- set_unused_iptunnel_name(worst->gw);
- worst->tunnel = NULL;
- }
- worst->gw = NULL;
- olsr_cookie_free(gw_container_entry_mem_cookie, olsr_gw_list_remove(&gw_list_ipv6, worst));
+ removeGatewayFromList(&gw_list_ipv6, false, worst);
}
get_unused_iptunnel_name(new_gw, name, &interfaceName);
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