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Diffstat (limited to 'vnet/vnet/ip/ip4_forward.c')
-rw-r--r--vnet/vnet/ip/ip4_forward.c138
1 files changed, 84 insertions, 54 deletions
diff --git a/vnet/vnet/ip/ip4_forward.c b/vnet/vnet/ip/ip4_forward.c
index 35c42d822b7..97e472b63c7 100644
--- a/vnet/vnet/ip/ip4_forward.c
+++ b/vnet/vnet/ip/ip4_forward.c
@@ -274,6 +274,85 @@ void ip4_add_del_route (ip4_main_t * im, ip4_add_del_route_args_t * a)
ip_del_adjacency (lm, old_adj_index);
}
+
+u32
+ip4_route_get_next_hop_adj (ip4_main_t * im,
+ u32 fib_index,
+ ip4_address_t *next_hop,
+ u32 next_hop_sw_if_index,
+ u32 explicit_fib_index)
+{
+ ip_lookup_main_t * lm = &im->lookup_main;
+ vnet_main_t * vnm = vnet_get_main();
+ uword * nh_hash, * nh_result;
+ int is_interface_next_hop;
+ u32 nh_adj_index;
+ ip4_fib_t * fib;
+
+ fib = vec_elt_at_index (im->fibs, fib_index);
+
+ is_interface_next_hop = next_hop->data_u32 == 0;
+ if (is_interface_next_hop)
+ {
+ nh_result = hash_get (im->interface_route_adj_index_by_sw_if_index, next_hop_sw_if_index);
+ if (nh_result)
+ nh_adj_index = *nh_result;
+ else
+ {
+ ip_adjacency_t * adj;
+ adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
+ &nh_adj_index);
+ ip4_adjacency_set_interface_route (vnm, adj, next_hop_sw_if_index, /* if_address_index */ ~0);
+ ip_call_add_del_adjacency_callbacks (lm, nh_adj_index, /* is_del */ 0);
+ hash_set (im->interface_route_adj_index_by_sw_if_index, next_hop_sw_if_index, nh_adj_index);
+ }
+ }
+ else if (next_hop_sw_if_index == ~0)
+ {
+ /* next-hop is recursive. we always need a indirect adj
+ * for recursive paths. Any LPM we perform now will give
+ * us a valid adj, but without tracking the next-hop we
+ * have no way to keep it valid.
+ */
+ ip_adjacency_t add_adj;
+ memset (&add_adj, 0, sizeof(add_adj));
+ add_adj.n_adj = 1;
+ add_adj.lookup_next_index = IP_LOOKUP_NEXT_INDIRECT;
+ add_adj.indirect.next_hop.ip4.as_u32 = next_hop->as_u32;
+ add_adj.explicit_fib_index = explicit_fib_index;
+ ip_add_adjacency (lm, &add_adj, 1, &nh_adj_index);
+ }
+ else
+ {
+ nh_hash = fib->adj_index_by_dst_address[32];
+ nh_result = hash_get (nh_hash, next_hop->data_u32);
+
+ /* Next hop must be known. */
+ if (! nh_result)
+ {
+ ip_adjacency_t * adj;
+
+ /* no /32 exists, get the longest prefix match */
+ nh_adj_index = ip4_fib_lookup_with_table (im, fib_index,
+ next_hop, 0);
+ adj = ip_get_adjacency (lm, nh_adj_index);
+ /* if ARP interface adjacency is present, we need to
+ install ARP adjaceny for specific next hop */
+ if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP &&
+ adj->arp.next_hop.ip4.as_u32 == 0)
+ {
+ nh_adj_index = vnet_arp_glean_add(fib_index, next_hop);
+ }
+ }
+ else
+ {
+ nh_adj_index = *nh_result;
+ }
+ }
+
+ return (nh_adj_index);
+}
+
void
ip4_add_del_route_next_hop (ip4_main_t * im,
u32 flags,
@@ -291,11 +370,9 @@ ip4_add_del_route_next_hop (ip4_main_t * im,
u32 dst_address_u32, old_mp_adj_index, new_mp_adj_index;
u32 dst_adj_index, nh_adj_index;
uword * dst_hash, * dst_result;
- uword * nh_hash, * nh_result;
ip_adjacency_t * dst_adj;
ip_multipath_adjacency_t * old_mp, * new_mp;
int is_del = (flags & IP4_ROUTE_FLAG_DEL) != 0;
- int is_interface_next_hop;
clib_error_t * error = 0;
if (explicit_fib_index == (u32)~0)
@@ -304,61 +381,14 @@ ip4_add_del_route_next_hop (ip4_main_t * im,
fib_index = explicit_fib_index;
fib = vec_elt_at_index (im->fibs, fib_index);
-
+
/* Lookup next hop to be added or deleted. */
- is_interface_next_hop = next_hop->data_u32 == 0;
if (adj_index == (u32)~0)
{
- if (is_interface_next_hop)
- {
- nh_result = hash_get (im->interface_route_adj_index_by_sw_if_index, next_hop_sw_if_index);
- if (nh_result)
- nh_adj_index = *nh_result;
- else
- {
- ip_adjacency_t * adj;
- adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
- &nh_adj_index);
- ip4_adjacency_set_interface_route (vnm, adj, next_hop_sw_if_index, /* if_address_index */ ~0);
- ip_call_add_del_adjacency_callbacks (lm, nh_adj_index, /* is_del */ 0);
- hash_set (im->interface_route_adj_index_by_sw_if_index, next_hop_sw_if_index, nh_adj_index);
- }
- }
- else
- {
- nh_hash = fib->adj_index_by_dst_address[32];
- nh_result = hash_get (nh_hash, next_hop->data_u32);
-
- /* Next hop must be known. */
- if (! nh_result)
- {
- ip_adjacency_t * adj;
-
- nh_adj_index = ip4_fib_lookup_with_table (im, fib_index,
- next_hop, 0);
- adj = ip_get_adjacency (lm, nh_adj_index);
- /* if ARP interface adjacencty is present, we need to
- install ARP adjaceny for specific next hop */
- if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP &&
- adj->arp.next_hop.ip4.as_u32 == 0)
- {
- nh_adj_index = vnet_arp_glean_add(fib_index, next_hop);
- }
- else
- {
- /* Next hop is not known, so create indirect adj */
- ip_adjacency_t add_adj;
- memset (&add_adj, 0, sizeof(add_adj));
- add_adj.n_adj = 1;
- add_adj.lookup_next_index = IP_LOOKUP_NEXT_INDIRECT;
- add_adj.indirect.next_hop.ip4.as_u32 = next_hop->as_u32;
- add_adj.explicit_fib_index = explicit_fib_index;
- ip_add_adjacency (lm, &add_adj, 1, &nh_adj_index);
- }
- }
- else
- nh_adj_index = *nh_result;
- }
+ nh_adj_index = ip4_route_get_next_hop_adj(im, fib_index,
+ next_hop,
+ next_hop_sw_if_index,
+ explicit_fib_index);
}
else
{