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Nest: Allow iface-only neighbors

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This commit is contained in:
Ondrej Zajicek (work) 2017-02-21 14:56:14 +01:00 committed by Jan Moskyto Matejka
parent 039a65d0e4
commit 5ffb62dd03
2 changed files with 96 additions and 35 deletions
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9
nest/iface.h
View File

@ -118,12 +118,15 @@ typedef struct neighbor {
SCOPE_HOST when it's our own address */
} neighbor;
#define NEF_STICKY 1
#define NEF_ONLINK 2
#define NEF_BIND 4 /* Used internally for neighbors bound to an iface */
#define NEF_STICKY 1
#define NEF_ONLINK 2
#define NEF_BIND 4 /* Used internally for neighbors bound to an iface */
#define NEF_IFACE 8 /* Neighbors bound to iface */
neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
neighbor *neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags);
neighbor *neigh_find_iface(struct proto *p, struct iface *ifa);
static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
{

122
nest/neighbor.c
View File

@ -48,7 +48,7 @@
#define NEIGH_HASH_OFFSET 24
static slab *neigh_slab;
static list sticky_neigh_list, neigh_hash_table[NEIGH_HASH_SIZE];
static list sticky_neigh_list, iface_neigh_list, neigh_hash_table[NEIGH_HASH_SIZE];
static inline uint
neigh_hash(struct proto *p, ip_addr *a)
@ -166,6 +166,8 @@ neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags)
return NULL;
n = sl_alloc(neigh_slab);
memset(n, 0, sizeof(neighbor));
n->addr = *a;
if (scope >= 0)
{
@ -187,6 +189,35 @@ neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags)
return n;
}
neighbor *
neigh_find_iface(struct proto *p, struct iface *ifa)
{
neighbor *n;
node *nn;
/* We keep neighbors with NEF_IFACE foremost in ifa->neighbors list */
WALK_LIST2(n, nn, ifa->neighbors, if_n)
{
if (! (n->flags & NEF_IFACE))
break;
if (n->proto == p)
return n;
}
n = sl_alloc(neigh_slab);
memset(n, 0, sizeof(neighbor));
add_tail(&iface_neigh_list, &n->n);
add_head(&ifa->neighbors, &n->if_n);
n->iface = ifa;
n->proto = p;
n->flags = NEF_IFACE;
n->scope = (ifa->flags & IF_UP) ? SCOPE_HOST : -1;
return n;
}
/**
* neigh_dump - dump specified neighbor entry.
* @n: the entry to dump
@ -205,6 +236,8 @@ neigh_dump(neighbor *n)
debug("%s %p %08x scope %s", n->proto->name, n->data, n->aux, ip_scope_text(n->scope));
if (n->flags & NEF_STICKY)
debug(" STICKY");
if (n->flags & NEF_IFACE)
debug(" IFACE");
debug("\n");
}
@ -223,6 +256,8 @@ neigh_dump_all(void)
debug("Known neighbors:\n");
WALK_LIST(n, sticky_neigh_list)
neigh_dump(n);
WALK_LIST(n, iface_neigh_list)
neigh_dump(n);
for(i=0; i<NEIGH_HASH_SIZE; i++)
WALK_LIST(n, neigh_hash_table[i])
neigh_dump(n);
@ -232,13 +267,18 @@ neigh_dump_all(void)
static void
neigh_up(neighbor *n, struct iface *i, int scope, struct ifa *a)
{
DBG("Waking up sticky neighbor %I\n", n->addr);
n->iface = i;
n->ifa = a;
n->scope = scope;
add_tail(&i->neighbors, &n->if_n);
rem_node(&n->n);
add_tail(&neigh_hash_table[neigh_hash(n->proto, &n->addr)], &n->n);
DBG("Waking up sticky neighbor %I\n", n->addr);
if (! (n->flags & NEF_IFACE))
{
add_tail(&i->neighbors, &n->if_n);
rem_node(&n->n);
add_tail(&neigh_hash_table[neigh_hash(n->proto, &n->addr)], &n->n);
}
if (n->proto->neigh_notify && (n->proto->proto_state != PS_STOP))
n->proto->neigh_notify(n);
}
@ -247,14 +287,20 @@ static void
neigh_down(neighbor *n)
{
DBG("Flushing neighbor %I on %s\n", n->addr, n->iface->name);
rem_node(&n->if_n);
if (! (n->flags & NEF_BIND))
if (! (n->flags & (NEF_BIND | NEF_IFACE)))
n->iface = NULL;
n->ifa = NULL;
n->scope = -1;
if (! (n->flags & NEF_IFACE))
{
rem_node(&n->if_n);
rem_node(&n->n);
}
if (n->proto->neigh_notify && (n->proto->proto_state != PS_STOP))
n->proto->neigh_notify(n);
rem_node(&n->n);
if (n->flags & NEF_STICKY)
{
add_tail(&sticky_neigh_list, &n->n);
@ -272,7 +318,8 @@ neigh_down(neighbor *n)
return;
}
}
else
if (! (n->flags & (NEF_STICKY | NEF_IFACE)))
sl_free(neigh_slab, n);
}
@ -290,10 +337,17 @@ void
neigh_if_up(struct iface *i)
{
struct ifa *a;
neighbor *n, *next;
neighbor *n;
node *x, *y;
int scope;
WALK_LIST_DELSAFE(n, next, sticky_neigh_list)
/* Wake up all iface neighbors */
WALK_LIST2_DELSAFE(n, x, y, i->neighbors, if_n)
if ((n->scope < 0) && (n->flags & NEF_IFACE))
neigh_up(n, i, SCOPE_HOST, NULL);
/* Wake up appropriate sticky neighbors */
WALK_LIST_DELSAFE(n, x, sticky_neigh_list)
if ((!n->iface || n->iface == i) &&
((scope = if_connected(&n->addr, i, &a)) >= 0))
neigh_up(n, i, scope, a);
@ -311,10 +365,11 @@ neigh_if_up(struct iface *i)
void
neigh_if_down(struct iface *i)
{
neighbor *n;
node *x, *y;
WALK_LIST_DELSAFE(x, y, i->neighbors)
neigh_down(SKIP_BACK(neighbor, if_n, x));
WALK_LIST2_DELSAFE(n, x, y, i->neighbors, if_n)
neigh_down(n);
}
/**
@ -328,14 +383,12 @@ neigh_if_down(struct iface *i)
void
neigh_if_link(struct iface *i)
{
neighbor *n;
node *x, *y;
WALK_LIST_DELSAFE(x, y, i->neighbors)
{
neighbor *n = SKIP_BACK(neighbor, if_n, x);
if (n->proto->neigh_notify && (n->proto->proto_state != PS_STOP))
n->proto->neigh_notify(n);
}
WALK_LIST2_DELSAFE(n, x, y, i->neighbors, if_n)
if (n->proto->neigh_notify && (n->proto->proto_state != PS_STOP))
n->proto->neigh_notify(n);
}
/**
@ -352,19 +405,21 @@ void
neigh_ifa_update(struct ifa *a)
{
struct iface *i = a->iface;
struct ifa *aa;
node *x, *y;
neighbor *n;
int scope;
/* Remove all neighbors whose scope has changed */
WALK_LIST_DELSAFE(x, y, i->neighbors)
{
struct ifa *aa;
neighbor *n = SKIP_BACK(neighbor, if_n, x);
if (if_connected(&n->addr, i, &aa) != n->scope)
neigh_down(n);
}
WALK_LIST2_DELSAFE(n, x, y, i->neighbors, if_n)
if (n->ifa && (if_connected(&n->addr, i, &aa) != n->scope))
neigh_down(n);
/* Wake up all sticky neighbors that are reachable now */
neigh_if_up(i);
WALK_LIST_DELSAFE(n, x, sticky_neigh_list)
if ((!n->iface || n->iface == i) &&
((scope = if_connected(&n->addr, i, &aa)) >= 0))
neigh_up(n, i, scope, aa);
}
static inline void
@ -373,7 +428,7 @@ neigh_prune_one(neighbor *n)
if (n->proto->proto_state != PS_DOWN)
return;
rem_node(&n->n);
if (n->scope >= 0)
if (n->if_n.next)
rem_node(&n->if_n);
sl_free(neigh_slab, n);
}
@ -398,6 +453,8 @@ neigh_prune(void)
neigh_prune_one(n);
WALK_LIST_DELSAFE(n, m, sticky_neigh_list)
neigh_prune_one(n);
WALK_LIST_DELSAFE(n, m, iface_neigh_list)
neigh_prune_one(n);
}
/**
@ -410,10 +467,11 @@ neigh_prune(void)
void
neigh_init(pool *if_pool)
{
int i;
neigh_slab = sl_new(if_pool, sizeof(neighbor));
init_list(&sticky_neigh_list);
for(i=0; i<NEIGH_HASH_SIZE; i++)
init_list(&iface_neigh_list);
for(int i = 0; i < NEIGH_HASH_SIZE; i++)
init_list(&neigh_hash_table[i]);
}