--- /dev/null
+/*
+ * 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>
+#include <vnet/ip/ip.h>
+
+/*
+ * The 'DB' of all mcast adjs.
+ * There is only one mcast per-interface per-protocol, so this is a per-interface
+ * vector
+ */
+static adj_index_t *adj_mcasts[FIB_PROTOCOL_MAX];
+
+static u32
+adj_get_mcast_node (fib_protocol_t proto)
+{
+ switch (proto) {
+ case FIB_PROTOCOL_IP4:
+ return (ip4_rewrite_mcast_node.index);
+ case FIB_PROTOCOL_IP6:
+ return (ip6_rewrite_mcast_node.index);
+ case FIB_PROTOCOL_MPLS:
+ break;
+ }
+ ASSERT(0);
+ return (0);
+}
+
+/*
+ * adj_mcast_add_or_lock
+ *
+ * The next_hop address here is used for source address selection in the DP.
+ * The mcast 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_mcast_add_or_lock (fib_protocol_t proto,
+ vnet_link_t link_type,
+ u32 sw_if_index)
+{
+ ip_adjacency_t * adj;
+
+ vec_validate_init_empty(adj_mcasts[proto], sw_if_index, ADJ_INDEX_INVALID);
+
+ if (ADJ_INDEX_INVALID == adj_mcasts[proto][sw_if_index])
+ {
+ vnet_main_t *vnm;
+
+ vnm = vnet_get_main();
+ adj = adj_alloc(proto);
+
+ adj->lookup_next_index = IP_LOOKUP_NEXT_MCAST;
+ adj->ia_nh_proto = proto;
+ adj->ia_link = link_type;
+ adj_mcasts[proto][sw_if_index] = adj_get_index(adj);
+ adj_lock(adj_get_index(adj));
+
+ vnet_rewrite_init(vnm, sw_if_index,
+ adj_get_mcast_node(proto),
+ vnet_tx_node_index_for_sw_interface(vnm, sw_if_index),
+ &adj->rewrite_header);
+
+ /*
+ * we need a rewrite where the destination IP address is converted
+ * to the appropriate link-layer address. This is interface specific.
+ * So ask the interface to do it.
+ */
+ vnet_update_adjacency_for_sw_interface(vnm, sw_if_index,
+ adj_get_index(adj));
+ }
+ else
+ {
+ adj = adj_get(adj_mcasts[proto][sw_if_index]);
+ adj_lock(adj_get_index(adj));
+ }
+
+ return (adj_get_index(adj));
+}
+
+/**
+ * adj_mcast_update_rewrite
+ *
+ * Update the adjacency's rewrite string. A NULL string implies the
+ * rewirte is reset (i.e. when ARP/ND etnry is gone).
+ * NB: the adj being updated may be handling traffic in the DP.
+ */
+void
+adj_mcast_update_rewrite (adj_index_t adj_index,
+ u8 *rewrite)
+{
+ ip_adjacency_t *adj;
+
+ ASSERT(ADJ_INDEX_INVALID != adj_index);
+
+ adj = adj_get(adj_index);
+
+ /*
+ * update the adj's rewrite string and build the arc
+ * from the rewrite node to the interface's TX node
+ */
+ adj_nbr_update_rewrite_internal(adj, IP_LOOKUP_NEXT_MCAST,
+ adj_get_mcast_node(adj->ia_nh_proto),
+ vnet_tx_node_index_for_sw_interface(
+ vnet_get_main(),
+ adj->rewrite_header.sw_if_index),
+ rewrite);
+}
+
+void
+adj_mcast_remove (fib_protocol_t proto,
+ u32 sw_if_index)
+{
+ ASSERT(sw_if_index < vec_len(adj_mcasts[proto]));
+
+ adj_mcasts[proto][sw_if_index] = ADJ_INDEX_INVALID;
+}
+
+static clib_error_t *
+adj_mcast_interface_state_change (vnet_main_t * vnm,
+ u32 sw_if_index,
+ u32 flags)
+{
+ /*
+ * for each mcast 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_mcasts[proto]) ||
+ ADJ_INDEX_INVALID == adj_mcasts[proto][sw_if_index])
+ continue;
+
+ adj = adj_get(adj_mcasts[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_mcast_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_mcast_interface_state_change(vnm, sw_if_index, (uword) arg);
+}
+
+/**
+ * @brief Registered callback for HW interface state changes
+ */
+static clib_error_t *
+adj_mcast_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_mcast_hw_interface_state_change);
+
+static clib_error_t *
+adj_mcast_interface_delete (vnet_main_t * vnm,
+ u32 sw_if_index,
+ u32 is_add)
+{
+ /*
+ * for each mcast 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_mcasts[proto]) ||
+ ADJ_INDEX_INVALID == adj_mcasts[proto][sw_if_index])
+ continue;
+
+ adj = adj_get(adj_mcasts[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_mcast_interface_delete);
+
+u8*
+format_adj_mcast (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);
+
+ s = format(s, "%U-mcast: ",
+ format_fib_protocol, adj->ia_nh_proto);
+ s = format (s, "%U",
+ format_vnet_rewrite,
+ vnm->vlib_main, &adj->rewrite_header,
+ sizeof (adj->rewrite_data), 0);
+
+ return (s);
+}
+
+
+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_mcast_dpo_vft = {
+ .dv_lock = adj_dpo_lock,
+ .dv_unlock = adj_dpo_unlock,
+ .dv_format = format_adj_mcast,
+};
+
+/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a mcast
+ * object.
+ *
+ * this means that these graph nodes are ones from which a mcast is the
+ * parent object in the DPO-graph.
+ */
+const static char* const adj_mcast_ip4_nodes[] =
+{
+ "ip4-rewrite-mcast",
+ NULL,
+};
+const static char* const adj_mcast_ip6_nodes[] =
+{
+ "ip6-rewrite-mcast",
+ NULL,
+};
+
+const static char* const * const adj_mcast_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = adj_mcast_ip4_nodes,
+ [DPO_PROTO_IP6] = adj_mcast_ip6_nodes,
+ [DPO_PROTO_MPLS] = NULL,
+};
+
+/**
+ * @brief Return the size of the adj DB.
+ * This is only for testing purposes so an efficient implementation is not needed
+ */
+u32
+adj_mcast_db_size (void)
+{
+ u32 n_adjs, sw_if_index;
+ fib_protocol_t proto;
+
+ n_adjs = 0;
+ for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
+ {
+ for (sw_if_index = 0;
+ sw_if_index < vec_len(adj_mcasts[proto]);
+ sw_if_index++)
+ {
+ if (ADJ_INDEX_INVALID != adj_mcasts[proto][sw_if_index])
+ {
+ n_adjs++;
+ }
+ }
+ }
+
+ return (n_adjs);
+}
+
+void
+adj_mcast_module_init (void)
+{
+ dpo_register(DPO_ADJACENCY_MCAST, &adj_mcast_dpo_vft, adj_mcast_nodes);
+}
Code Review / vpp.git / blobdiff