1 files changed, 285 insertions, 0 deletions
diff --git a/src/vnet/adj/adj_glean.c b/src/vnet/adj/adj_glean.c
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+++ b/src/vnet/adj/adj_glean.c
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+/*
+ * 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.h>
+#include <vnet/adj/adj_internal.h>
+#include <vnet/fib/fib_walk.h>
+
+/*
+ * The 'DB' of all glean adjs.
+ * There is only one glean per-interface per-protocol, so this is a per-interface
+ * vector
+ */
+static adj_index_t *adj_gleans[FIB_PROTOCOL_MAX];
+
+static inline vlib_node_registration_t*
+adj_get_glean_node (fib_protocol_t proto)
+{
+    switch (proto) {
+    case FIB_PROTOCOL_IP4:
+	return (&ip4_glean_node);
+    case FIB_PROTOCOL_IP6:
+	return (&ip6_glean_node);
+    case FIB_PROTOCOL_MPLS:
+	break;
+    }
+    ASSERT(0);
+    return (NULL);
+}
+
+/*
+ * adj_glean_add_or_lock
+ *
+ * The next_hop address here is used for source address selection in the DP.
+ * The glean adj is added to an interface's connected prefix, the next-hop
+ * passed here is the local prefix on the same interface.
+ */
+adj_index_t
+adj_glean_add_or_lock (fib_protocol_t proto,
+		       u32 sw_if_index,
+		       const ip46_address_t *nh_addr)
+{
+    ip_adjacency_t * adj;
+
+    vec_validate_init_empty(adj_gleans[proto], sw_if_index, ADJ_INDEX_INVALID);
+
+    if (ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index])
+    {
+	adj = adj_alloc(proto);
+
+	adj->lookup_next_index = IP_LOOKUP_NEXT_GLEAN;
+	adj->ia_nh_proto = proto;
+	adj_gleans[proto][sw_if_index] = adj_get_index(adj);
+
+	if (NULL != nh_addr)
+	{
+	    adj->sub_type.glean.receive_addr = *nh_addr;
+	}
+
+	adj->rewrite_header.data_bytes = 0;
+
+	vnet_rewrite_for_sw_interface(vnet_get_main(),
+				      adj_fib_proto_2_nd(proto),
+				      sw_if_index,
+				      adj_get_glean_node(proto)->index,
+				      VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST,
+				      &adj->rewrite_header,
+				      sizeof (adj->rewrite_data));
+    }
+    else
+    {
+	adj = adj_get(adj_gleans[proto][sw_if_index]);
+    }
+
+    adj_lock(adj_get_index(adj));
+
+    return (adj_get_index(adj));
+}
+
+void
+adj_glean_remove (fib_protocol_t proto,
+		  u32 sw_if_index)
+{
+    ASSERT(sw_if_index < vec_len(adj_gleans[proto]));
+
+    adj_gleans[proto][sw_if_index] = ADJ_INDEX_INVALID;
+}
+
+static clib_error_t *
+adj_glean_interface_state_change (vnet_main_t * vnm,
+				  u32 sw_if_index,
+				  u32 flags)
+{
+    /*
+     * for each glean on the interface trigger a walk back to the children
+     */
+    fib_protocol_t proto;
+    ip_adjacency_t *adj;
+
+
+    for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
+    {
+	if (sw_if_index >= vec_len(adj_gleans[proto]) ||
+	    ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index])
+	    continue;
+
+	adj = adj_get(adj_gleans[proto][sw_if_index]);
+
+	fib_node_back_walk_ctx_t bw_ctx = {
+	    .fnbw_reason = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP ?
+			    FIB_NODE_BW_REASON_FLAG_INTERFACE_UP :
+			    FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN),
+	};
+
+	fib_walk_sync(FIB_NODE_TYPE_ADJ, adj_get_index(adj), &bw_ctx);
+    }
+
+    return (NULL);
+}
+
+VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(adj_glean_interface_state_change);
+
+/**
+ * @brief Invoked on each SW interface of a HW interface when the
+ * HW interface state changes
+ */
+static void
+adj_nbr_hw_sw_interface_state_change (vnet_main_t * vnm,
+                                      u32 sw_if_index,
+                                      void *arg)
+{
+    adj_glean_interface_state_change(vnm, sw_if_index, (uword) arg);
+}
+
+/**
+ * @brief Registered callback for HW interface state changes
+ */
+static clib_error_t *
+adj_glean_hw_interface_state_change (vnet_main_t * vnm,
+                                     u32 hw_if_index,
+                                     u32 flags)
+{
+    /*
+     * walk SW interfaces on the HW
+     */
+    uword sw_flags;
+
+    sw_flags = ((flags & VNET_HW_INTERFACE_FLAG_LINK_UP) ?
+                VNET_SW_INTERFACE_FLAG_ADMIN_UP :
+                0);
+
+    vnet_hw_interface_walk_sw(vnm, hw_if_index,
+                              adj_nbr_hw_sw_interface_state_change,
+                              (void*) sw_flags);
+
+    return (NULL);
+}
+
+VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(
+    adj_glean_hw_interface_state_change);
+
+static clib_error_t *
+adj_glean_interface_delete (vnet_main_t * vnm,
+			    u32 sw_if_index,
+			    u32 is_add)
+{
+    /*
+     * for each glean on the interface trigger a walk back to the children
+     */
+    fib_protocol_t proto;
+    ip_adjacency_t *adj;
+
+    if (is_add)
+    {
+	/*
+	 * not interested in interface additions. we will not back walk
+	 * to resolve paths through newly added interfaces. Why? The control
+	 * plane should have the brains to add interfaces first, then routes.
+	 * So the case where there are paths with a interface that matches
+	 * one just created is the case where the path resolved through an
+	 * interface that was deleted, and still has not been removed. The
+	 * new interface added, is NO GUARANTEE that the interface being
+	 * added now, even though it may have the same sw_if_index, is the
+	 * same interface that the path needs. So tough!
+	 * If the control plane wants these routes to resolve it needs to
+	 * remove and add them again.
+	 */
+	return (NULL);
+    }
+
+    for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
+    {
+	if (sw_if_index >= vec_len(adj_gleans[proto]) ||
+	    ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index])
+	    continue;
+
+	adj = adj_get(adj_gleans[proto][sw_if_index]);
+
+	fib_node_back_walk_ctx_t bw_ctx = {
+	    .fnbw_reason =  FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE,
+	};
+
+	fib_walk_sync(FIB_NODE_TYPE_ADJ, adj_get_index(adj), &bw_ctx);
+    }
+
+    return (NULL);
+}
+
+VNET_SW_INTERFACE_ADD_DEL_FUNCTION(adj_glean_interface_delete);
+
+u8*
+format_adj_glean (u8* s, va_list *ap)
+{
+    index_t index = va_arg(*ap, index_t);
+    CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
+    vnet_main_t * vnm = vnet_get_main();
+    ip_adjacency_t * adj = adj_get(index);
+
+    return (format(s, "%U-glean: %U",
+		   format_fib_protocol, adj->ia_nh_proto,
+                   format_vnet_sw_interface_name,
+                   vnm,
+                   vnet_get_sw_interface(vnm,
+                                         adj->rewrite_header.sw_if_index)));
+}
+
+
+static void
+adj_dpo_lock (dpo_id_t *dpo)
+{
+    adj_lock(dpo->dpoi_index);
+}
+static void
+adj_dpo_unlock (dpo_id_t *dpo)
+{
+    adj_unlock(dpo->dpoi_index);
+}
+
+const static dpo_vft_t adj_glean_dpo_vft = {
+    .dv_lock = adj_dpo_lock,
+    .dv_unlock = adj_dpo_unlock,
+    .dv_format = format_adj_glean,
+};
+
+/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a glean
+ *        object.
+ *
+ * this means that these graph nodes are ones from which a glean is the
+ * parent object in the DPO-graph.
+ */
+const static char* const glean_ip4_nodes[] =
+{
+    "ip4-glean",
+    NULL,
+};
+const static char* const glean_ip6_nodes[] =
+{
+    "ip6-glean",
+    NULL,
+};
+
+const static char* const * const glean_nodes[DPO_PROTO_NUM] =
+{
+    [DPO_PROTO_IP4]  = glean_ip4_nodes,
+    [DPO_PROTO_IP6]  = glean_ip6_nodes,
+    [DPO_PROTO_MPLS] = NULL,
+};
+
+void
+adj_glean_module_init (void)
+{
+    dpo_register(DPO_ADJACENCY_GLEAN, &adj_glean_dpo_vft, glean_nodes);
+}