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authorNeale Ranns <nranns@cisco.com>2016-11-22 17:07:28 +0000
committerDamjan Marion <dmarion.lists@gmail.com>2017-01-27 19:53:46 +0000
commit32e1c010b0c34fd0984f7fc45fae648a182025c5 (patch)
tree06a440bdc9dc039ad0dcf866acc9e10a6ea5e2e7 /src/vnet/mfib/mfib_entry.c
parent6f692d6e5a8ffc920a728372ef773199bc5466c0 (diff)
IP Multicast FIB (mfib)
- IPv[46] mfib tables with support for (*,G/m), (*,G) and (S,G) exact and longest prefix match - Replication represented via a new replicate DPO. - RPF configuration and data-plane checking - data-plane signals sent to listening control planes. The functions of multicast forwarding entries differ from their unicast conterparts, so we introduce a new mfib_table_t and mfib_entry_t objects. However, we re-use the fib_path_list to resolve and build the entry's output list. the fib_path_list provides the service to construct a replicate DPO for multicast. 'make tests' is added to with two new suites; TEST=mfib, this is invocation of the CLI command 'test mfib' which deals with many path add/remove, flag set/unset scenarios, TEST=ip-mcast, data-plane forwarding tests. Updated applications to use the new MIFB functions; - IPv6 NS/RA. - DHCPv6 unit tests for these are undated accordingly. Change-Id: I49ec37b01f1b170335a5697541c8fd30e6d3a961 Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/mfib/mfib_entry.c')
-rw-r--r--src/vnet/mfib/mfib_entry.c1096
1 files changed, 1096 insertions, 0 deletions
diff --git a/src/vnet/mfib/mfib_entry.c b/src/vnet/mfib/mfib_entry.c
new file mode 100644
index 00000000000..479ce5f1442
--- /dev/null
+++ b/src/vnet/mfib/mfib_entry.c
@@ -0,0 +1,1096 @@
+/*
+ * 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 <vlib/vlib.h>
+
+#include <vnet/mfib/mfib_entry.h>
+#include <vnet/fib/fib_path_list.h>
+
+#include <vnet/dpo/drop_dpo.h>
+#include <vnet/dpo/replicate_dpo.h>
+
+/**
+ * Debug macro
+ */
+#ifdef MFIB_DEBUG
+#DEFIne MFIB_ENTRY_DBG(_e, _fmt, _args...) \
+{ \
+ u8*__tmp = NULL; \
+ __tmp = format(__tmp, "e:[%d:%U", \
+ mfib_entry_get_index(_e), \
+ format_ip46_address, \
+ &_e->mfe_prefix.fp_grp_addr, \
+ IP46_TYPE_ANY); \
+ __tmp = format(__tmp, "/%d,", \
+ _e->mfe_prefix.fp_len); \
+ __tmp = format(__tmp, "%U]", \
+ mfib_entry_get_index(_e), \
+ format_ip46_address, \
+ &_e->mfe_prefix.fp_src_addr, \
+ IP46_TYPE_ANY); \
+ __tmp = format(__tmp, _fmt, ##_args); \
+ clib_warning("%s", __tmp); \
+ vec_free(__tmp); \
+}
+#else
+#define MFIB_ENTRY_DBG(_e, _fmt, _args...)
+#endif
+
+/**
+ * The source of an MFIB entry
+ */
+typedef struct mfib_entry_src_t_
+{
+ /**
+ * Which source this is
+ */
+ mfib_source_t mfes_src;
+
+ /**
+ * The path-list of forwarding interfaces
+ */
+ fib_node_index_t mfes_pl;
+
+ /**
+ * Route flags
+ */
+ mfib_entry_flags_t mfes_flags;
+
+ /**
+ * The hash table of all interfaces
+ */
+ mfib_itf_t *mfes_itfs;
+} mfib_entry_src_t;
+
+/**
+ * String names for each source
+ */
+static const char *mfib_source_names[] = MFIB_SOURCE_NAMES;
+
+/*
+ * Pool for all fib_entries
+ */
+mfib_entry_t *mfib_entry_pool;
+
+static fib_node_t *
+mfib_entry_get_node (fib_node_index_t index)
+{
+ return ((fib_node_t*)mfib_entry_get(index));
+}
+
+static fib_protocol_t
+mfib_entry_get_proto (const mfib_entry_t * mfib_entry)
+{
+ return (mfib_entry->mfe_prefix.fp_proto);
+}
+
+fib_forward_chain_type_t
+mfib_entry_get_default_chain_type (const mfib_entry_t *mfib_entry)
+{
+ switch (mfib_entry->mfe_prefix.fp_proto)
+ {
+ case FIB_PROTOCOL_IP4:
+ return (FIB_FORW_CHAIN_TYPE_MCAST_IP4);
+ case FIB_PROTOCOL_IP6:
+ return (FIB_FORW_CHAIN_TYPE_MCAST_IP6);
+ case FIB_PROTOCOL_MPLS:
+ ASSERT(0);
+ break;
+ }
+ return (FIB_FORW_CHAIN_TYPE_MCAST_IP4);
+}
+
+static u8 *
+format_mfib_entry_dpo (u8 * s, va_list * args)
+{
+ index_t fei = va_arg(*args, index_t);
+ CLIB_UNUSED(u32 indent) = va_arg(*args, u32);
+
+ return (format(s, "%U",
+ format_mfib_entry, fei,
+ MFIB_ENTRY_FORMAT_BRIEF));
+}
+
+u8 *
+format_mfib_entry (u8 * s, va_list * args)
+{
+ fib_node_index_t fei, mfi;
+ mfib_entry_t *mfib_entry;
+ mfib_entry_src_t *msrc;
+ u32 sw_if_index;
+ int level;
+
+ fei = va_arg (*args, fib_node_index_t);
+ level = va_arg (*args, int);
+ mfib_entry = mfib_entry_get(fei);
+
+ s = format (s, "%U", format_mfib_prefix, &mfib_entry->mfe_prefix);
+ s = format (s, ": %U", format_mfib_entry_flags, mfib_entry->mfe_flags);
+
+ if (level >= MFIB_ENTRY_FORMAT_DETAIL)
+ {
+ s = format (s, "\n");
+ s = format (s, " fib:%d", mfib_entry->mfe_fib_index);
+ s = format (s, " index:%d", mfib_entry_get_index(mfib_entry));
+ s = format (s, " locks:%d\n", mfib_entry->mfe_node.fn_locks);
+ vec_foreach(msrc, mfib_entry->mfe_srcs)
+ {
+ s = format (s, " src:%s", mfib_source_names[msrc->mfes_src]);
+ s = format (s, ": %U\n", format_mfib_entry_flags, msrc->mfes_flags);
+ if (FIB_NODE_INDEX_INVALID != msrc->mfes_pl)
+ {
+ s = fib_path_list_format(msrc->mfes_pl, s);
+ }
+ hash_foreach(sw_if_index, mfi, msrc->mfes_itfs,
+ ({
+ s = format(s, " %U\n", format_mfib_itf, mfi);
+ }));
+ }
+ }
+
+ s = format(s, "\n Interfaces:");
+ hash_foreach(sw_if_index, mfi, mfib_entry->mfe_itfs,
+ ({
+ s = format(s, "\n %U", format_mfib_itf, mfi);
+ }));
+
+ s = format(s, "\n %U-chain\n %U",
+ format_fib_forw_chain_type,
+ mfib_entry_get_default_chain_type(mfib_entry),
+ format_dpo_id,
+ &mfib_entry->mfe_rep,
+ 2);
+ s = format(s, "\n");
+
+ if (level >= MFIB_ENTRY_FORMAT_DETAIL2)
+ {
+ s = format(s, "\nchildren:");
+ s = fib_node_children_format(mfib_entry->mfe_node.fn_children, s);
+ }
+
+ return (s);
+}
+
+static mfib_entry_t*
+mfib_entry_from_fib_node (fib_node_t *node)
+{
+#if CLIB_DEBUG > 0
+ ASSERT(FIB_NODE_TYPE_MFIB_ENTRY == node->fn_type);
+#endif
+ return ((mfib_entry_t*)node);
+}
+
+static int
+mfib_entry_src_cmp_for_sort (void * v1,
+ void * v2)
+{
+ mfib_entry_src_t *esrc1 = v1, *esrc2 = v2;
+
+ return (esrc1->mfes_src - esrc2->mfes_src);
+}
+
+static void
+mfib_entry_src_init (mfib_entry_t *mfib_entry,
+ mfib_source_t source)
+
+{
+ mfib_entry_src_t esrc = {
+ .mfes_pl = FIB_NODE_INDEX_INVALID,
+ .mfes_flags = MFIB_ENTRY_FLAG_NONE,
+ .mfes_src = source,
+ };
+
+ vec_add1(mfib_entry->mfe_srcs, esrc);
+ vec_sort_with_function(mfib_entry->mfe_srcs,
+ mfib_entry_src_cmp_for_sort);
+}
+
+static mfib_entry_src_t *
+mfib_entry_src_find (const mfib_entry_t *mfib_entry,
+ mfib_source_t source,
+ u32 *index)
+
+{
+ mfib_entry_src_t *esrc;
+ int ii;
+
+ ii = 0;
+ vec_foreach(esrc, mfib_entry->mfe_srcs)
+ {
+ if (esrc->mfes_src == source)
+ {
+ if (NULL != index)
+ {
+ *index = ii;
+ }
+ return (esrc);
+ }
+ else
+ {
+ ii++;
+ }
+ }
+
+ return (NULL);
+}
+
+static mfib_entry_src_t *
+mfib_entry_src_find_or_create (mfib_entry_t *mfib_entry,
+ mfib_source_t source)
+{
+ mfib_entry_src_t *esrc;
+
+ esrc = mfib_entry_src_find(mfib_entry, source, NULL);
+
+ if (NULL == esrc)
+ {
+ mfib_entry_src_init(mfib_entry, source);
+ }
+
+ return (mfib_entry_src_find(mfib_entry, source, NULL));
+}
+
+static mfib_entry_src_t*
+mfib_entry_get_best_src (const mfib_entry_t *mfib_entry)
+{
+ mfib_entry_src_t *bsrc;
+
+ /*
+ * the enum of sources is deliberately arranged in priority order
+ */
+ if (0 == vec_len(mfib_entry->mfe_srcs))
+ {
+ bsrc = NULL;
+ }
+ else
+ {
+ bsrc = vec_elt_at_index(mfib_entry->mfe_srcs, 0);
+ }
+
+ return (bsrc);
+}
+
+static void
+mfib_entry_src_flush (mfib_entry_src_t *msrc)
+{
+ u32 sw_if_index;
+ index_t mfii;
+
+ hash_foreach(sw_if_index, mfii, msrc->mfes_itfs,
+ ({
+ mfib_itf_delete(mfib_itf_get(mfii));
+ }));
+}
+
+static void
+mfib_entry_src_remove (mfib_entry_t *mfib_entry,
+ mfib_source_t source)
+
+{
+ mfib_entry_src_t *msrc;
+ u32 index = ~0;
+
+ msrc = mfib_entry_src_find(mfib_entry, source, &index);
+
+ if (NULL != msrc)
+ {
+ mfib_entry_src_flush(msrc);
+ vec_del1(mfib_entry->mfe_srcs, index);
+ }
+}
+
+static int
+mfib_entry_src_n_itfs (const mfib_entry_src_t *msrc)
+{
+ return (hash_elts(msrc->mfes_itfs));
+}
+
+
+static void
+mfib_entry_last_lock_gone (fib_node_t *node)
+{
+ mfib_entry_t *mfib_entry;
+ mfib_entry_src_t *msrc;
+
+ mfib_entry = mfib_entry_from_fib_node(node);
+
+ dpo_reset(&mfib_entry->mfe_rep);
+
+ MFIB_ENTRY_DBG(mfib_entry, "last-lock");
+
+ vec_foreach(msrc, mfib_entry->mfe_srcs)
+ {
+ mfib_entry_src_flush(msrc);
+ }
+
+ fib_path_list_unlock(mfib_entry->mfe_parent);
+ vec_free(mfib_entry->mfe_srcs);
+
+ fib_node_deinit(&mfib_entry->mfe_node);
+ pool_put(mfib_entry_pool, mfib_entry);
+}
+
+/*
+ * mfib_entry_back_walk_notify
+ *
+ * A back walk has reach this entry.
+ */
+static fib_node_back_walk_rc_t
+mfib_entry_back_walk_notify (fib_node_t *node,
+ fib_node_back_walk_ctx_t *ctx)
+{
+ // FIXME - re-evalute
+
+ return (FIB_NODE_BACK_WALK_CONTINUE);
+}
+
+static void
+mfib_entry_show_memory (void)
+{
+ fib_show_memory_usage("multicast-Entry",
+ pool_elts(mfib_entry_pool),
+ pool_len(mfib_entry_pool),
+ sizeof(mfib_entry_t));
+}
+
+/*
+ * The MFIB entry's graph node virtual function table
+ */
+static const fib_node_vft_t mfib_entry_vft = {
+ .fnv_get = mfib_entry_get_node,
+ .fnv_last_lock = mfib_entry_last_lock_gone,
+ .fnv_back_walk = mfib_entry_back_walk_notify,
+ .fnv_mem_show = mfib_entry_show_memory,
+};
+
+u32
+mfib_entry_child_add (fib_node_index_t mfib_entry_index,
+ fib_node_type_t child_type,
+ fib_node_index_t child_index)
+{
+ return (fib_node_child_add(FIB_NODE_TYPE_MFIB_ENTRY,
+ mfib_entry_index,
+ child_type,
+ child_index));
+};
+
+void
+mfib_entry_child_remove (fib_node_index_t mfib_entry_index,
+ u32 sibling_index)
+{
+ fib_node_child_remove(FIB_NODE_TYPE_MFIB_ENTRY,
+ mfib_entry_index,
+ sibling_index);
+}
+
+static mfib_entry_t *
+mfib_entry_alloc (u32 fib_index,
+ const mfib_prefix_t *prefix,
+ fib_node_index_t *mfib_entry_index)
+{
+ mfib_entry_t *mfib_entry;
+
+ pool_get(mfib_entry_pool, mfib_entry);
+ memset(mfib_entry, 0, sizeof(*mfib_entry));
+
+ fib_node_init(&mfib_entry->mfe_node,
+ FIB_NODE_TYPE_MFIB_ENTRY);
+
+ mfib_entry->mfe_fib_index = fib_index;
+ mfib_entry->mfe_prefix = *prefix;
+ mfib_entry->mfe_parent = FIB_NODE_INDEX_INVALID;
+
+ dpo_reset(&mfib_entry->mfe_rep);
+
+ *mfib_entry_index = mfib_entry_get_index(mfib_entry);
+
+ MFIB_ENTRY_DBG(mfib_entry, "alloc");
+
+ return (mfib_entry);
+}
+
+typedef struct mfib_entry_collect_forwarding_ctx_t_
+{
+ load_balance_path_t * next_hops;
+ fib_forward_chain_type_t fct;
+} mfib_entry_collect_forwarding_ctx_t;
+
+static int
+mfib_entry_src_collect_forwarding (fib_node_index_t pl_index,
+ fib_node_index_t path_index,
+ void *arg)
+{
+ mfib_entry_collect_forwarding_ctx_t *ctx;
+ load_balance_path_t *nh;
+
+ ctx = arg;
+
+ /*
+ * if the path is not resolved, don't include it.
+ */
+ if (!fib_path_is_resolved(path_index))
+ {
+ return (!0);
+ }
+
+ switch (ctx->fct)
+ {
+ case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
+ case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
+ /*
+ * EOS traffic with no label to stack, we need the IP Adj
+ */
+ vec_add2(ctx->next_hops, nh, 1);
+
+ nh->path_index = path_index;
+ nh->path_weight = fib_path_get_weight(path_index);
+ fib_path_contribute_forwarding(path_index, ctx->fct, &nh->path_dpo);
+ break;
+
+ case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
+ case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
+ case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
+ case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
+ case FIB_FORW_CHAIN_TYPE_ETHERNET:
+ ASSERT(0);
+ break;
+ }
+
+ return (!0);
+}
+
+static void
+mfib_entry_stack (mfib_entry_t *mfib_entry)
+{
+ mfib_entry_collect_forwarding_ctx_t ctx = {
+ .next_hops = NULL,
+ .fct = mfib_entry_get_default_chain_type(mfib_entry),
+ };
+ dpo_proto_t dp;
+
+ dp = fib_proto_to_dpo(mfib_entry_get_proto(mfib_entry));
+
+ if (FIB_NODE_INDEX_INVALID != mfib_entry->mfe_parent)
+ {
+ fib_path_list_walk(mfib_entry->mfe_parent,
+ mfib_entry_src_collect_forwarding,
+ &ctx);
+
+ if (!dpo_id_is_valid(&mfib_entry->mfe_rep) ||
+ dpo_is_drop(&mfib_entry->mfe_rep))
+ {
+ dpo_id_t tmp_dpo = DPO_INVALID;
+
+ dpo_set(&tmp_dpo,
+ DPO_REPLICATE, dp,
+ replicate_create(0, dp));
+
+ dpo_stack(DPO_MFIB_ENTRY, dp,
+ &mfib_entry->mfe_rep,
+ &tmp_dpo);
+
+ dpo_reset(&tmp_dpo);
+ }
+ replicate_multipath_update(&mfib_entry->mfe_rep,
+ ctx.next_hops);
+ }
+ else
+ {
+ dpo_stack(DPO_MFIB_ENTRY, dp,
+ &mfib_entry->mfe_rep,
+ drop_dpo_get(dp));
+ }
+}
+
+static void
+mfib_entry_forwarding_path_add (mfib_entry_src_t *msrc,
+ const fib_route_path_t *rpath)
+{
+ fib_node_index_t old_pl_index;
+ fib_route_path_t *rpaths;
+
+ /*
+ * path-lists require a vector of paths
+ */
+ rpaths = NULL;
+ vec_add1(rpaths, rpath[0]);
+
+ old_pl_index = msrc->mfes_pl;
+
+ if (FIB_NODE_INDEX_INVALID == msrc->mfes_pl)
+ {
+ msrc->mfes_pl =
+ fib_path_list_create(FIB_PATH_LIST_FLAG_NO_URPF,
+ rpaths);
+ }
+ else
+ {
+ msrc->mfes_pl =
+ fib_path_list_copy_and_path_add(msrc->mfes_pl,
+ FIB_PATH_LIST_FLAG_NO_URPF,
+ rpaths);
+ }
+ fib_path_list_lock(msrc->mfes_pl);
+ fib_path_list_unlock(old_pl_index);
+
+ vec_free(rpaths);
+}
+
+static int
+mfib_entry_forwarding_path_remove (mfib_entry_src_t *msrc,
+ const fib_route_path_t *rpath)
+{
+ fib_node_index_t old_pl_index;
+ fib_route_path_t *rpaths;
+
+ /*
+ * path-lists require a vector of paths
+ */
+ rpaths = NULL;
+ vec_add1(rpaths, rpath[0]);
+
+ old_pl_index = msrc->mfes_pl;
+
+ msrc->mfes_pl =
+ fib_path_list_copy_and_path_remove(msrc->mfes_pl,
+ FIB_PATH_LIST_FLAG_NONE,
+ rpaths);
+
+ fib_path_list_lock(msrc->mfes_pl);
+ fib_path_list_unlock(old_pl_index);
+
+ vec_free(rpaths);
+
+ return (FIB_NODE_INDEX_INVALID != msrc->mfes_pl);
+}
+
+static void
+mfib_entry_recalculate_forwarding (mfib_entry_t *mfib_entry)
+{
+ fib_node_index_t old_pl_index;
+ mfib_entry_src_t *bsrc;
+
+ old_pl_index = mfib_entry->mfe_parent;
+
+ /*
+ * copy the forwarding data from the bast source
+ */
+ bsrc = mfib_entry_get_best_src(mfib_entry);
+
+ if (NULL == bsrc)
+ {
+ mfib_entry->mfe_parent = FIB_NODE_INDEX_INVALID;
+ }
+ else
+ {
+ mfib_entry->mfe_parent = bsrc->mfes_pl;
+ mfib_entry->mfe_flags = bsrc->mfes_flags;
+ mfib_entry->mfe_itfs = bsrc->mfes_itfs;
+ }
+
+ /*
+ * re-stack the entry on the best forwarding info.
+ */
+ if (old_pl_index != mfib_entry->mfe_parent ||
+ FIB_NODE_INDEX_INVALID == old_pl_index)
+ {
+ mfib_entry_stack(mfib_entry);
+
+ fib_path_list_lock(mfib_entry->mfe_parent);
+ fib_path_list_unlock(old_pl_index);
+ }
+}
+
+
+fib_node_index_t
+mfib_entry_create (u32 fib_index,
+ mfib_source_t source,
+ const mfib_prefix_t *prefix,
+ mfib_entry_flags_t entry_flags)
+{
+ fib_node_index_t mfib_entry_index;
+ mfib_entry_t *mfib_entry;
+ mfib_entry_src_t *msrc;
+
+ mfib_entry = mfib_entry_alloc(fib_index, prefix,
+ &mfib_entry_index);
+ msrc = mfib_entry_src_find_or_create(mfib_entry, source);
+ msrc->mfes_flags = entry_flags;
+
+ mfib_entry_recalculate_forwarding(mfib_entry);
+
+ return (mfib_entry_index);
+}
+
+static int
+mfib_entry_ok_for_delete (mfib_entry_t *mfib_entry)
+{
+ return (0 == vec_len(mfib_entry->mfe_srcs));
+}
+
+static int
+mfib_entry_src_ok_for_delete (const mfib_entry_src_t *msrc)
+{
+ return ((MFIB_ENTRY_FLAG_NONE == msrc->mfes_flags &&
+ 0 == mfib_entry_src_n_itfs(msrc)));
+}
+
+int
+mfib_entry_update (fib_node_index_t mfib_entry_index,
+ mfib_source_t source,
+ mfib_entry_flags_t entry_flags)
+{
+ mfib_entry_t *mfib_entry;
+ mfib_entry_src_t *msrc;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+ msrc = mfib_entry_src_find_or_create(mfib_entry, source);
+ msrc->mfes_flags = entry_flags;
+
+ if (mfib_entry_src_ok_for_delete(msrc))
+ {
+ /*
+ * this source has no interfaces and no flags.
+ * it has nothing left to give - remove it
+ */
+ mfib_entry_src_remove(mfib_entry, source);
+ }
+
+ mfib_entry_recalculate_forwarding(mfib_entry);
+
+ return (mfib_entry_ok_for_delete(mfib_entry));
+}
+
+static void
+mfib_entry_itf_add (mfib_entry_src_t *msrc,
+ u32 sw_if_index,
+ index_t mi)
+{
+ hash_set(msrc->mfes_itfs, sw_if_index, mi);
+}
+
+static void
+mfib_entry_itf_remove (mfib_entry_src_t *msrc,
+ u32 sw_if_index)
+{
+ mfib_itf_t *mfi;
+
+ mfi = mfib_entry_itf_find(msrc->mfes_itfs, sw_if_index);
+
+ mfib_itf_delete(mfi);
+
+ hash_unset(msrc->mfes_itfs, sw_if_index);
+}
+
+void
+mfib_entry_path_update (fib_node_index_t mfib_entry_index,
+ mfib_source_t source,
+ const fib_route_path_t *rpath,
+ mfib_itf_flags_t itf_flags)
+{
+ mfib_entry_t *mfib_entry;
+ mfib_entry_src_t *msrc;
+ mfib_itf_t *mfib_itf;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+ ASSERT(NULL != mfib_entry);
+ msrc = mfib_entry_src_find_or_create(mfib_entry, source);
+
+ /*
+ * search for the interface in the current set
+ */
+ mfib_itf = mfib_entry_itf_find(msrc->mfes_itfs,
+ rpath[0].frp_sw_if_index);
+
+ if (NULL == mfib_itf)
+ {
+ /*
+ * this is a path we do not yet have. If it is forwarding then we
+ * add it to the replication set
+ */
+ if (itf_flags & MFIB_ITF_FLAG_FORWARD)
+ {
+ mfib_entry_forwarding_path_add(msrc, rpath);
+ }
+ /*
+ * construct a new ITF for this entry's list
+ */
+ mfib_entry_itf_add(msrc,
+ rpath[0].frp_sw_if_index,
+ mfib_itf_create(rpath[0].frp_sw_if_index,
+ itf_flags));
+ }
+ else
+ {
+ int was_forwarding = !!(mfib_itf->mfi_flags & MFIB_ITF_FLAG_FORWARD);
+ int is_forwarding = !!(itf_flags & MFIB_ITF_FLAG_FORWARD);
+
+ if (!was_forwarding && is_forwarding)
+ {
+ mfib_entry_forwarding_path_add(msrc, rpath);
+ }
+ else if (was_forwarding && !is_forwarding)
+ {
+ mfib_entry_forwarding_path_remove(msrc, rpath);
+ }
+ /*
+ * packets in flight see these updates.
+ */
+ mfib_itf->mfi_flags = itf_flags;
+ }
+
+ mfib_entry_recalculate_forwarding(mfib_entry);
+}
+
+/*
+ * mfib_entry_path_remove
+ *
+ * remove a path from the entry.
+ * return the mfib_entry's index if it is still present, INVALID otherwise.
+ */
+int
+mfib_entry_path_remove (fib_node_index_t mfib_entry_index,
+ mfib_source_t source,
+ const fib_route_path_t *rpath)
+{
+ mfib_entry_t *mfib_entry;
+ mfib_entry_src_t *msrc;
+ mfib_itf_t *mfib_itf;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+ ASSERT(NULL != mfib_entry);
+ msrc = mfib_entry_src_find(mfib_entry, source, NULL);
+
+ if (NULL == msrc)
+ {
+ /*
+ * there are no paths left for this source
+ */
+ return (mfib_entry_ok_for_delete(mfib_entry));
+ }
+
+ /*
+ * search for the interface in the current set
+ */
+ mfib_itf = mfib_entry_itf_find(msrc->mfes_itfs,
+ rpath[0].frp_sw_if_index);
+
+ if (NULL == mfib_itf)
+ {
+ /*
+ * removing a path that does not exist
+ */
+ return (mfib_entry_ok_for_delete(mfib_entry));
+ }
+
+ /*
+ * we have this path. If it is forwarding then we
+ * remove it to the replication set
+ */
+ if (mfib_itf->mfi_flags & MFIB_ITF_FLAG_FORWARD)
+ {
+ mfib_entry_forwarding_path_remove(msrc, rpath);
+ }
+
+ /*
+ * remove the interface/path from this entry's list
+ */
+ mfib_entry_itf_remove(msrc, rpath[0].frp_sw_if_index);
+
+ if (mfib_entry_src_ok_for_delete(msrc))
+ {
+ /*
+ * this source has no interfaces and no flags.
+ * it has nothing left to give - remove it
+ */
+ mfib_entry_src_remove(mfib_entry, source);
+ }
+
+ mfib_entry_recalculate_forwarding(mfib_entry);
+
+ return (mfib_entry_ok_for_delete(mfib_entry));
+}
+
+/**
+ * mfib_entry_delete
+ *
+ * The source is withdrawing all the paths it provided
+ */
+int
+mfib_entry_delete (fib_node_index_t mfib_entry_index,
+ mfib_source_t source)
+{
+ mfib_entry_t *mfib_entry;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+ mfib_entry_src_remove(mfib_entry, source);
+
+ mfib_entry_recalculate_forwarding(mfib_entry);
+
+ return (mfib_entry_ok_for_delete(mfib_entry));
+}
+
+static int
+fib_ip4_address_compare (ip4_address_t * a1,
+ ip4_address_t * a2)
+{
+ /*
+ * IP addresses are unsiged ints. the return value here needs to be signed
+ * a simple subtraction won't cut it.
+ * If the addresses are the same, the sort order is undefiend, so phoey.
+ */
+ return ((clib_net_to_host_u32(a1->data_u32) >
+ clib_net_to_host_u32(a2->data_u32) ) ?
+ 1 : -1);
+}
+
+static int
+fib_ip6_address_compare (ip6_address_t * a1,
+ ip6_address_t * a2)
+{
+ int i;
+ for (i = 0; i < ARRAY_LEN (a1->as_u16); i++)
+ {
+ int cmp = (clib_net_to_host_u16 (a1->as_u16[i]) -
+ clib_net_to_host_u16 (a2->as_u16[i]));
+ if (cmp != 0)
+ return cmp;
+ }
+ return 0;
+}
+
+static int
+mfib_entry_cmp (fib_node_index_t mfib_entry_index1,
+ fib_node_index_t mfib_entry_index2)
+{
+ mfib_entry_t *mfib_entry1, *mfib_entry2;
+ int cmp = 0;
+
+ mfib_entry1 = mfib_entry_get(mfib_entry_index1);
+ mfib_entry2 = mfib_entry_get(mfib_entry_index2);
+
+ switch (mfib_entry1->mfe_prefix.fp_proto)
+ {
+ case FIB_PROTOCOL_IP4:
+ cmp = fib_ip4_address_compare(&mfib_entry1->mfe_prefix.fp_grp_addr.ip4,
+ &mfib_entry2->mfe_prefix.fp_grp_addr.ip4);
+
+ if (0 == cmp)
+ {
+ cmp = fib_ip4_address_compare(&mfib_entry1->mfe_prefix.fp_src_addr.ip4,
+ &mfib_entry2->mfe_prefix.fp_src_addr.ip4);
+ }
+ break;
+ case FIB_PROTOCOL_IP6:
+ cmp = fib_ip6_address_compare(&mfib_entry1->mfe_prefix.fp_grp_addr.ip6,
+ &mfib_entry2->mfe_prefix.fp_grp_addr.ip6);
+
+ if (0 == cmp)
+ {
+ cmp = fib_ip6_address_compare(&mfib_entry1->mfe_prefix.fp_src_addr.ip6,
+ &mfib_entry2->mfe_prefix.fp_src_addr.ip6);
+ }
+ break;
+ case FIB_PROTOCOL_MPLS:
+ ASSERT(0);
+ cmp = 0;
+ break;
+ }
+
+ if (0 == cmp) {
+ cmp = (mfib_entry1->mfe_prefix.fp_len - mfib_entry2->mfe_prefix.fp_len);
+ }
+ return (cmp);
+}
+
+int
+mfib_entry_cmp_for_sort (void *i1, void *i2)
+{
+ fib_node_index_t *mfib_entry_index1 = i1, *mfib_entry_index2 = i2;
+
+ return (mfib_entry_cmp(*mfib_entry_index1,
+ *mfib_entry_index2));
+}
+
+void
+mfib_entry_lock (fib_node_index_t mfib_entry_index)
+{
+ mfib_entry_t *mfib_entry;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+
+ fib_node_lock(&mfib_entry->mfe_node);
+}
+
+void
+mfib_entry_unlock (fib_node_index_t mfib_entry_index)
+{
+ mfib_entry_t *mfib_entry;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+
+ fib_node_unlock(&mfib_entry->mfe_node);
+}
+
+static void
+mfib_entry_dpo_lock (dpo_id_t *dpo)
+{
+}
+static void
+mfib_entry_dpo_unlock (dpo_id_t *dpo)
+{
+}
+
+const static dpo_vft_t mfib_entry_dpo_vft = {
+ .dv_lock = mfib_entry_dpo_lock,
+ .dv_unlock = mfib_entry_dpo_unlock,
+ .dv_format = format_mfib_entry_dpo,
+ .dv_mem_show = mfib_entry_show_memory,
+};
+
+const static char* const mfib_entry_ip4_nodes[] =
+{
+ "ip4-mfib-forward-rpf",
+ NULL,
+};
+const static char* const mfib_entry_ip6_nodes[] =
+{
+ "ip6-mfib-forward-rpf",
+ NULL,
+};
+
+const static char* const * const mfib_entry_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = mfib_entry_ip4_nodes,
+ [DPO_PROTO_IP6] = mfib_entry_ip6_nodes,
+};
+
+void
+mfib_entry_module_init (void)
+{
+ fib_node_register_type (FIB_NODE_TYPE_MFIB_ENTRY, &mfib_entry_vft);
+ dpo_register(DPO_MFIB_ENTRY, &mfib_entry_dpo_vft, mfib_entry_nodes);
+}
+
+void
+mfib_entry_encode (fib_node_index_t mfib_entry_index,
+ fib_route_path_encode_t **api_rpaths)
+{
+ mfib_entry_t *mfib_entry;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+ fib_path_list_walk(mfib_entry->mfe_parent, fib_path_encode, api_rpaths);
+}
+
+void
+mfib_entry_get_prefix (fib_node_index_t mfib_entry_index,
+ mfib_prefix_t *pfx)
+{
+ mfib_entry_t *mfib_entry;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+ *pfx = mfib_entry->mfe_prefix;
+}
+
+u32
+mfib_entry_get_fib_index (fib_node_index_t mfib_entry_index)
+{
+ mfib_entry_t *mfib_entry;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+
+ return (mfib_entry->mfe_fib_index);
+}
+
+void
+mfib_entry_contribute_forwarding (fib_node_index_t mfib_entry_index,
+ fib_forward_chain_type_t type,
+ dpo_id_t *dpo)
+{
+ /*
+ * An IP mFIB entry can only provide a forwarding chain that
+ * is the same IP proto as the prefix.
+ * No use-cases (i know of) for other combinations.
+ */
+ mfib_entry_t *mfib_entry;
+ dpo_proto_t dp;
+
+ mfib_entry = mfib_entry_get(mfib_entry_index);
+
+ dp = fib_proto_to_dpo(mfib_entry->mfe_prefix.fp_proto);
+
+ if (type == fib_forw_chain_type_from_dpo_proto(dp))
+ {
+ dpo_copy(dpo, &mfib_entry->mfe_rep);
+ }
+ else
+ {
+ dpo_copy(dpo, drop_dpo_get(dp));
+ }
+}
+
+u32
+mfib_entry_pool_size (void)
+{
+ return (pool_elts(mfib_entry_pool));
+}
+
+static clib_error_t *
+show_mfib_entry_command (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ fib_node_index_t fei;
+
+ if (unformat (input, "%d", &fei))
+ {
+ /*
+ * show one in detail
+ */
+ if (!pool_is_free_index(mfib_entry_pool, fei))
+ {
+ vlib_cli_output (vm, "%d@%U",
+ fei,
+ format_mfib_entry, fei,
+ MFIB_ENTRY_FORMAT_DETAIL2);
+ }
+ else
+ {
+ vlib_cli_output (vm, "entry %d invalid", fei);
+ }
+ }
+ else
+ {
+ /*
+ * show all
+ */
+ vlib_cli_output (vm, "FIB Entries:");
+ pool_foreach_index(fei, mfib_entry_pool,
+ ({
+ vlib_cli_output (vm, "%d@%U",
+ fei,
+ format_mfib_entry, fei,
+ MFIB_ENTRY_FORMAT_BRIEF);
+ }));
+ }
+
+ return (NULL);
+}
+
+VLIB_CLI_COMMAND (show_mfib_entry, static) = {
+ .path = "show mfib entry",
+ .function = show_mfib_entry_command,
+ .short_help = "show mfib entry",
+};