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authorNeale Ranns <nranns@cisco.com>2019-03-26 07:02:58 +0000
committerDamjan Marion <dmarion@me.com>2019-03-26 16:33:28 +0000
commit4c3ba81709bab8f9fcdef650e7f742fe9ddbae32 (patch)
treefb8dba665f570749b785bd5dc76dfce317367fca /src/vnet/adj
parentaf3f0783b0ef189d54bb8fdf0a112347a420e9bb (diff)
ADJ: midchain delegate to performing stacking
this can be used by e.g. tunnels so it doesn't need to be implemented for each tunnel type. Change-Id: I0790f89aa49f83421612b35108cce67693285999 Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/adj')
-rw-r--r--src/vnet/adj/adj.c30
-rw-r--r--src/vnet/adj/adj_delegate.c2
-rw-r--r--src/vnet/adj/adj_delegate.h6
-rw-r--r--src/vnet/adj/adj_midchain.h21
-rw-r--r--src/vnet/adj/adj_midchain_delegate.c183
5 files changed, 237 insertions, 5 deletions
diff --git a/src/vnet/adj/adj.c b/src/vnet/adj/adj.c
index 3ca3d6015f9..9d18dbf2727 100644
--- a/src/vnet/adj/adj.c
+++ b/src/vnet/adj/adj.c
@@ -537,10 +537,32 @@ static fib_node_back_walk_rc_t
adj_back_walk_notify (fib_node_t *node,
fib_node_back_walk_ctx_t *ctx)
{
- /*
- * Que pasa. yo soj en el final!
- */
- ASSERT(0);
+ ip_adjacency_t *adj;
+
+ adj = ADJ_FROM_NODE(node);
+
+ switch (adj->lookup_next_index)
+ {
+ case IP_LOOKUP_NEXT_MIDCHAIN:
+ adj_midchain_delegate_restack(adj_get_index(adj));
+ break;
+ case IP_LOOKUP_NEXT_ARP:
+ case IP_LOOKUP_NEXT_REWRITE:
+ case IP_LOOKUP_NEXT_BCAST:
+ case IP_LOOKUP_NEXT_GLEAN:
+ case IP_LOOKUP_NEXT_MCAST:
+ case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
+ case IP_LOOKUP_NEXT_DROP:
+ case IP_LOOKUP_NEXT_PUNT:
+ case IP_LOOKUP_NEXT_LOCAL:
+ case IP_LOOKUP_NEXT_ICMP_ERROR:
+ case IP_LOOKUP_N_NEXT:
+ /*
+ * Que pasa. yo soj en el final!
+ */
+ ASSERT(0);
+ break;
+ }
return (FIB_NODE_BACK_WALK_CONTINUE);
}
diff --git a/src/vnet/adj/adj_delegate.c b/src/vnet/adj/adj_delegate.c
index 15dcb02afaa..cd5301c1e77 100644
--- a/src/vnet/adj/adj_delegate.c
+++ b/src/vnet/adj/adj_delegate.c
@@ -25,7 +25,7 @@ static adj_delegate_vft_t *ad_vfts;
/**
* The value of the last dynamically allocated delegeate value
*/
-static adj_delegate_type_t ad_max_id = ADJ_DELEGATE_BFD;
+static adj_delegate_type_t ad_max_id = ADJ_DELEGATE_LAST;
static adj_delegate_t *
adj_delegate_find_i (const ip_adjacency_t *adj,
diff --git a/src/vnet/adj/adj_delegate.h b/src/vnet/adj/adj_delegate.h
index 13bf911c5a6..f6da245bb52 100644
--- a/src/vnet/adj/adj_delegate.h
+++ b/src/vnet/adj/adj_delegate.h
@@ -36,8 +36,14 @@ typedef enum adj_delegate_type_t_ {
* BFD session state
*/
ADJ_DELEGATE_BFD,
+ /**
+ * Stacking of a midchain's nexthop
+ */
+ ADJ_DELEGATE_MIDCHAIN,
} adj_delegate_type_t;
+#define ADJ_DELEGATE_LAST (ADJ_DELEGATE_MIDCHAIN)
+
/**
* Adj delegate. This object is attached to the adjacency.
*/
diff --git a/src/vnet/adj/adj_midchain.h b/src/vnet/adj/adj_midchain.h
index 24fea427a6b..1f5deaecd95 100644
--- a/src/vnet/adj/adj_midchain.h
+++ b/src/vnet/adj/adj_midchain.h
@@ -118,4 +118,25 @@ extern void adj_midchain_module_init(void);
*/
extern u8* format_adj_midchain(u8* s, va_list *ap);
+/**
+ * @brief
+ * create/attach a midchain delegate and stack it on the prefix passed
+ * @param ai - the index of the adjacency to stack
+ * @param fib_index - The FIB index of the prefix on which to stack
+ * @param pfx - The prefix on which to stack
+ */
+extern void adj_midchain_delegate_stack(adj_index_t ai,
+ u32 fib_index,
+ const fib_prefix_t *pfx);
+
+/**
+ * @brief restack a midchain delegate
+ */
+extern void adj_midchain_delegate_restack(adj_index_t ai);
+
+/**
+ * @brief unstack a midchain delegate (this stacks it on a drop)
+ */
+extern void adj_midchain_delegate_unstack(adj_index_t ai);
+
#endif
diff --git a/src/vnet/adj/adj_midchain_delegate.c b/src/vnet/adj/adj_midchain_delegate.c
new file mode 100644
index 00000000000..922283e92cf
--- /dev/null
+++ b/src/vnet/adj/adj_midchain_delegate.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/adj/adj_delegate.h>
+#include <vnet/adj/adj_midchain.h>
+#include <vnet/fib/fib_table.h>
+
+/**
+ * Midchain stacker delegate
+ */
+typedef struct adj_midchain_delegate_t_
+{
+ /**
+ * the Fib Entry we are stacked on
+ */
+ fib_node_index_t amd_fei;
+
+ /**
+ * The sibling entry on the FIB entry
+ */
+ u32 amd_sibling;
+} adj_midchain_delegate_t;
+
+/**
+ * Pool of delegates
+ */
+static adj_midchain_delegate_t *amd_pool;
+
+static inline const adj_midchain_delegate_t*
+adj_midchain_from_const_base (const adj_delegate_t *ad)
+{
+ if (NULL != ad)
+ {
+ return (pool_elt_at_index(amd_pool, ad->ad_index));
+ }
+ return (NULL);
+}
+
+static void
+adj_midchain_delegate_restack_i (adj_index_t ai,
+ adj_midchain_delegate_t *amd)
+{
+ if (vnet_sw_interface_is_admin_up (vnet_get_main (),
+ adj_get_sw_if_index(ai)) &&
+ (FIB_NODE_INDEX_INVALID != amd->amd_fei))
+ {
+ const fib_prefix_t *pfx;
+
+ pfx = fib_entry_get_prefix(amd->amd_fei);
+
+ adj_nbr_midchain_stack_on_fib_entry (
+ ai,
+ amd->amd_fei,
+ fib_forw_chain_type_from_fib_proto(pfx->fp_proto));
+ }
+ else
+ {
+ adj_nbr_midchain_unstack (ai);
+ }
+}
+
+void
+adj_midchain_delegate_restack (adj_index_t ai)
+{
+ adj_midchain_delegate_t *amd;
+ ip_adjacency_t *adj;
+ adj_delegate_t *ad;
+
+ /*
+ * if there's a delegate already use that
+ */
+ adj = adj_get(ai);
+ ad = adj_delegate_get(adj, ADJ_DELEGATE_MIDCHAIN);
+
+ if (NULL != ad)
+ {
+ amd = pool_elt_at_index(amd_pool, ad->ad_index);
+
+ adj_midchain_delegate_restack_i(ai, amd);
+ }
+ /*
+ * else
+ * nothing to stack
+ */
+}
+
+void
+adj_midchain_delegate_stack (adj_index_t ai,
+ u32 fib_index,
+ const fib_prefix_t *pfx)
+{
+ adj_midchain_delegate_t *amd;
+ ip_adjacency_t *adj;
+ adj_delegate_t *ad;
+
+ /*
+ * if there's a delegate already use that
+ */
+ adj = adj_get(ai);
+ ad = adj_delegate_get(adj, ADJ_DELEGATE_MIDCHAIN);
+
+ if (NULL != ad)
+ {
+ amd = pool_elt_at_index(amd_pool, ad->ad_index);
+ }
+ else
+ {
+ pool_get(amd_pool, amd);
+ amd->amd_fei = FIB_NODE_INDEX_INVALID;
+ adj_delegate_add(adj, ADJ_DELEGATE_MIDCHAIN, amd - amd_pool);
+
+ amd->amd_fei = fib_table_entry_special_add(fib_index,
+ pfx,
+ FIB_SOURCE_RR,
+ FIB_ENTRY_FLAG_NONE);
+ amd->amd_sibling = fib_entry_child_add(amd->amd_fei,
+ FIB_NODE_TYPE_ADJ,
+ ai);
+ }
+ adj_midchain_delegate_restack_i(ai, amd);
+}
+
+void
+adj_midchain_delegate_unstack (adj_index_t ai)
+{
+ adj_nbr_midchain_unstack(ai);
+}
+
+static void
+adj_midchain_delegate_adj_deleted (adj_delegate_t *ad)
+{
+ adj_midchain_delegate_t *amd;
+
+ amd = pool_elt_at_index(amd_pool, ad->ad_index);
+
+ fib_entry_child_remove (amd->amd_fei, amd->amd_sibling);
+ fib_table_entry_delete_index (amd->amd_fei, FIB_SOURCE_RR);
+
+ pool_put(amd_pool, amd);
+}
+
+/**
+ * Print a delegate that represents MIDCHAIN tracking
+ */
+static u8 *
+adj_midchain_delegate_fmt (const adj_delegate_t *aed, u8 *s)
+{
+ const adj_midchain_delegate_t *amd = adj_midchain_from_const_base(aed);
+
+ s = format(s, "MIDCHAIN:[fib-entry:%d]", amd->amd_fei);
+
+ return (s);
+}
+
+const static adj_delegate_vft_t adj_delegate_vft = {
+ .adv_format = adj_midchain_delegate_fmt,
+ .adv_adj_deleted = adj_midchain_delegate_adj_deleted,
+};
+
+static clib_error_t *
+adj_midchain_delegate_module_init (vlib_main_t * vm)
+{
+ clib_error_t * error = NULL;
+
+ adj_delegate_register_type (ADJ_DELEGATE_MIDCHAIN, &adj_delegate_vft);
+
+ return (error);
+}
+
+VLIB_INIT_FUNCTION (adj_midchain_delegate_module_init);
+