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Rewrote the IPv6 route management so that all routes are maintained on a list that is ordered by the time at which the route was accessed. If a new route is added to the system, the oldest route is dropped.

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This commit is contained in:
Adam Dunkels 2013-11-22 15:28:46 +01:00
parent 6265219775
commit 9819c5b5b8
2 changed files with 85 additions and 47 deletions
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121
core/net/uip-ds6-route.c
View file

@ -46,12 +46,12 @@
so that it will be maintained along with the rest of the neighbor
tables in the system. */
NBR_TABLE(struct uip_ds6_route_neighbor_routes, nbr_routes);
MEMB(neighborroutememb, struct uip_ds6_route_neighbor_route, UIP_DS6_ROUTE_NB);
/* Each route is repressented by a uip_ds6_route_t structure and
memory for each route is allocated from the routememb memory
block. These routes are maintained on lists of route entries that
are attached to each neighbor, via the nbr_routes neighbor
table. */
block. These routes are maintained on the routelist. */
LIST(routelist);
MEMB(routememb, uip_ds6_route_t, UIP_DS6_ROUTE_NB);
/* Default routes are held on the defaultrouterlist and their
@ -82,11 +82,11 @@ assert_nbr_routes_list_sane(void)
for(r = uip_ds6_route_head(),
count = 0;
r != NULL &&
count < UIP_DS6_ROUTE_NB;
count < UIP_DS6_ROUTE_NB * 2;
r = uip_ds6_route_next(r),
count++);
if(count >= UIP_DS6_ROUTE_NB) {
if(count > UIP_DS6_ROUTE_NB) {
printf("uip-ds6-route.c: assert_nbr_routes_list_sane route list is in infinite loop\n");
}
@ -140,6 +140,7 @@ void
uip_ds6_route_init(void)
{
memb_init(&routememb);
list_init(routelist);
nbr_table_register(nbr_routes,
(nbr_table_callback *)rm_routelist_callback);
@ -155,7 +156,8 @@ static uip_lladdr_t *
uip_ds6_route_nexthop_lladdr(uip_ds6_route_t *route)
{
if(route != NULL) {
return (uip_lladdr_t *)nbr_table_get_lladdr(nbr_routes, route->routes);
return (uip_lladdr_t *)nbr_table_get_lladdr(nbr_routes,
route->neighbor_routes);
} else {
return NULL;
}
@ -174,17 +176,7 @@ uip_ds6_route_nexthop(uip_ds6_route_t *route)
uip_ds6_route_t *
uip_ds6_route_head(void)
{
struct uip_ds6_route_neighbor_routes *routes;
routes = (struct uip_ds6_route_neighbor_routes *)nbr_table_head(nbr_routes);
if(routes != NULL) {
if(list_head(routes->route_list) == NULL) {
PRINTF("uip_ds6_route_head lead_head(nbr_route_list) is NULL\n");
}
return list_head(routes->route_list);
} else {
return NULL;
}
return list_head(routelist);
}
/*---------------------------------------------------------------------------*/
uip_ds6_route_t *
@ -192,18 +184,8 @@ uip_ds6_route_next(uip_ds6_route_t *r)
{
if(r != NULL) {
uip_ds6_route_t *n = list_item_next(r);
if(n != NULL) {
return n;
} else {
struct uip_ds6_route_neighbor_routes *routes;
routes = (struct uip_ds6_route_neighbor_routes *)
nbr_table_next(nbr_routes, r->routes);
if(routes != NULL) {
return list_head(routes->route_list);
}
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
@ -247,6 +229,15 @@ uip_ds6_route_lookup(uip_ipaddr_t *addr)
PRINTF("uip-ds6-route: No route found\n");
}
if(found_route != NULL) {
/* If we found a route, we put it at the end of the routeslist
list. The list is ordered by how recently we looked them up:
the least recently used route will be at the start of the
list. */
list_remove(routelist, found_route);
list_add(routelist, found_route);
}
return found_route;
}
/*---------------------------------------------------------------------------*/
@ -255,6 +246,7 @@ uip_ds6_route_add(uip_ipaddr_t *ipaddr, uint8_t length,
uip_ipaddr_t *nexthop)
{
uip_ds6_route_t *r;
struct uip_ds6_route_neighbor_route *nbrr;
#if DEBUG != DEBUG_NONE
assert_nbr_routes_list_sane();
@ -263,8 +255,8 @@ uip_ds6_route_add(uip_ipaddr_t *ipaddr, uint8_t length,
/* Get link-layer address of next hop, make sure it is in neighbor table */
const uip_lladdr_t *nexthop_lladdr = uip_ds6_nbr_lladdr_from_ipaddr(nexthop);
if(nexthop_lladdr == NULL) {
PRINTF("uip_ds6_route_add: neighbor link-local address unknown ");
PRINT6ADDR(ipaddr);
PRINTF("uip_ds6_route_add: neighbor link-local address unknown for ");
PRINT6ADDR(nexthop);
PRINTF("\n");
return NULL;
}
@ -279,7 +271,22 @@ uip_ds6_route_add(uip_ipaddr_t *ipaddr, uint8_t length,
PRINTF("\n");
} else {
struct uip_ds6_route_neighbor_routes *routes;
/* If there is no routing entry, create one */
/* If there is no routing entry, create one. We first need to
check if we have room for this route. If not, we remove the
least recently used one we have. */
if(uip_ds6_route_num_routes() == UIP_DS6_ROUTE_NB) {
/* Removing the oldest route entry from the route table. The
least recently used route is the first route on the list. */
uip_ds6_route_t *oldest;
oldest = uip_ds6_route_head();
PRINTF("uip_ds6_route_add: dropping route to ");
PRINT6ADDR(&oldest->ipaddr);
PRINTF("\n");
uip_ds6_route_rm(oldest);
}
/* Every neighbor on our neighbor table holds a struct
uip_ds6_route_neighbor_routes which holds a list of routes that
@ -301,9 +308,9 @@ uip_ds6_route_add(uip_ipaddr_t *ipaddr, uint8_t length,
routes = nbr_table_add_lladdr(nbr_routes,
(rimeaddr_t *)nexthop_lladdr);
if(routes == NULL) {
PRINTF("uip_ds6_route_add: could not allocate a neighbor table entri for new route to ");
PRINT6ADDR(ipaddr);
PRINTF(", dropping it\n");
/* This should not happen, as we explicitly deallocated one
route table entry above. */
PRINTF("uip_ds6_route_add: could not allocate neighbor table entry\n");
return NULL;
}
LIST_STRUCT_INIT(routes, route_list);
@ -313,19 +320,30 @@ uip_ds6_route_add(uip_ipaddr_t *ipaddr, uint8_t length,
r = memb_alloc(&routememb);
if(r == NULL) {
PRINTF("uip_ds6_route_add: could not allocate memory for new route to ");
PRINT6ADDR(ipaddr);
PRINTF(", dropping it\n");
/* This should not happen, as we explicitly deallocated one
route table entry above. */
PRINTF("uip_ds6_route_add: could not allocate route\n");
return NULL;
}
list_add(routelist, r);
nbrr = memb_alloc(&neighborroutememb);
if(nbrr == NULL) {
/* This should not happen, as we explicitly deallocated one
route table entry above. */
PRINTF("uip_ds6_route_add: could not allocate neighbor route list entry\n");
memb_free(&routememb, r);
return NULL;
}
nbrr->route = r;
/* Add the route to this neighbor */
list_add(routes->route_list, r);
list_add(routes->route_list, nbrr);
r->neighbor_routes = routes;
num_routes++;
PRINTF("uip_ds6_route_add num %d\n", num_routes);
r->routes = routes;
}
uip_ipaddr_copy(&(r->ipaddr), ipaddr);
@ -356,23 +374,38 @@ uip_ds6_route_add(uip_ipaddr_t *ipaddr, uint8_t length,
void
uip_ds6_route_rm(uip_ds6_route_t *route)
{
struct uip_ds6_route_neighbor_route *neighbor_route;
#if DEBUG != DEBUG_NONE
assert_nbr_routes_list_sane();
#endif /* DEBUG != DEBUG_NONE */
if(route != NULL && route->routes != NULL) {
if(route != NULL && route->neighbor_routes != NULL) {
PRINTF("uip_ds6_route_rm: removing route: ");
PRINT6ADDR(&route->ipaddr);
PRINTF("\n");
list_remove(route->routes->route_list, route);
if(list_head(route->routes->route_list) == NULL) {
/* Remove the neighbor from the route list */
list_remove(routelist, route);
/* Find the corresponding neighbor_route and remove it. */
for(neighbor_route = list_head(route->neighbor_routes->route_list);
neighbor_route != NULL && neighbor_route->route != route;
neighbor_route = list_item_next(neighbor_route));
if(neighbor_route == NULL) {
PRINTF("uip_ds6_route_rm: neighbor_route was NULL for ");
uip_debug_ipaddr_print(&route->ipaddr);
PRINTF("\n");
}
list_remove(route->neighbor_routes->route_list, neighbor_route);
if(list_head(route->neighbor_routes->route_list) == NULL) {
/* If this was the only route using this neighbor, remove the
neibhor from the table */
PRINTF("uip_ds6_route_rm: removing neighbor too\n");
nbr_table_remove(nbr_routes, route->routes->route_list);
nbr_table_remove(nbr_routes, route->neighbor_routes->route_list);
}
memb_free(&routememb, route);
memb_free(&neighborroutememb, neighbor_route);
num_routes--;
@ -417,10 +450,10 @@ rm_routelist(struct uip_ds6_route_neighbor_routes *routes)
#endif /* DEBUG != DEBUG_NONE */
PRINTF("uip_ds6_route_rm_routelist\n");
if(routes != NULL && routes->route_list != NULL) {
uip_ds6_route_t *r;
struct uip_ds6_route_neighbor_route *r;
r = list_head(routes->route_list);
while(r != NULL) {
uip_ds6_route_rm(r);
uip_ds6_route_rm(r->route);
r = list_head(routes->route_list);
}
nbr_table_remove(nbr_routes, routes);

9
core/net/uip-ds6-route.h
View file

@ -107,7 +107,7 @@ typedef struct uip_ds6_route {
routes field point to the uip_ds6_route_neighbor_routes that
belong to the neighbor table entry that this routing table entry
uses. */
struct uip_ds6_route_neighbor_routes *routes;
struct uip_ds6_route_neighbor_routes *neighbor_routes;
uip_ipaddr_t ipaddr;
#ifdef UIP_DS6_ROUTE_STATE_TYPE
UIP_DS6_ROUTE_STATE_TYPE state;
@ -115,7 +115,12 @@ typedef struct uip_ds6_route {
uint8_t length;
} uip_ds6_route_t;
/** \brief A neighbor route list entry, used on the
uip_ds6_route->neighbor_routes->route_list list. */
struct uip_ds6_route_neighbor_route {
struct uip_ds6_route_neighbor_route *next;
struct uip_ds6_route *route;
};
/** \brief An entry in the default router list */
typedef struct uip_ds6_defrt {