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-rw-r--r--src/vnet/fib/fib_path_list.c1223
1 files changed, 1223 insertions, 0 deletions
diff --git a/src/vnet/fib/fib_path_list.c b/src/vnet/fib/fib_path_list.c
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index 00000000000..5b35e9b87e7
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+++ b/src/vnet/fib/fib_path_list.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 <vppinfra/mhash.h>
+#include <vnet/ip/ip.h>
+#include <vnet/adj/adj.h>
+#include <vnet/dpo/load_balance.h>
+#include <vnet/dpo/load_balance_map.h>
+
+#include <vnet/fib/fib_path_list.h>
+#include <vnet/fib/fib_internal.h>
+#include <vnet/fib/fib_node_list.h>
+#include <vnet/fib/fib_walk.h>
+#include <vnet/fib/fib_urpf_list.h>
+
+/**
+ * FIB path-list
+ * A representation of the list/set of path trough which a prefix is reachable
+ */
+typedef struct fib_path_list_t_ {
+ /**
+ * A path-list is a node in the FIB graph.
+ */
+ fib_node_t fpl_node;
+
+ /**
+ * Flags on the path-list
+ */
+ fib_path_list_flags_t fpl_flags;
+
+ /**
+ * The next-hop protocol for the paths in this path list.
+ * Note that fixing the proto here means we don't support a mix of
+ * v4 and v6 paths. ho hum.
+ */
+ fib_protocol_t fpl_nh_proto;
+
+ /**
+ * Vector of paths indicies for all configured paths.
+ * For shareable path-lists this list MUST not change.
+ */
+ fib_node_index_t *fpl_paths;
+
+ /**
+ * the RPF list calculated for this path list
+ */
+ fib_node_index_t fpl_urpf;
+} fib_path_list_t;
+
+/*
+ * Array of strings/names for the FIB sources
+ */
+static const char *fib_path_list_attr_names[] = FIB_PATH_LIST_ATTRIBUTES;
+
+/*
+ * The memory pool from which we allocate all the path-lists
+ */
+static fib_path_list_t * fib_path_list_pool;
+
+/*
+ * The data-base of shared path-lists
+ */
+static uword *fib_path_list_db;
+
+/*
+ * Debug macro
+ */
+#ifdef FIB_DEBUG
+#define FIB_PATH_LIST_DBG(_pl, _fmt, _args...) \
+{ \
+ u8 *_tmp = 0; \
+ _tmp = fib_path_list_format( \
+ fib_path_list_get_index(_pl), _tmp); \
+ clib_warning("pl:[%d:%p:%p:%s]:" _fmt, \
+ fib_path_list_get_index(_pl), \
+ _pl, _pl->fpl_paths, _tmp, \
+ ##_args); \
+ vec_free(_tmp); \
+}
+#else
+#define FIB_PATH_LIST_DBG(_pl, _fmt, _args...)
+#endif
+
+static fib_path_list_t *
+fib_path_list_get (fib_node_index_t index)
+{
+ return (pool_elt_at_index(fib_path_list_pool, index));
+}
+
+static fib_node_t *
+fib_path_list_get_node (fib_node_index_t index)
+{
+ return ((fib_node_t*)fib_path_list_get(index));
+}
+
+static fib_path_list_t*
+fib_path_list_from_fib_node (fib_node_t *node)
+{
+#if CLIB_DEBUG > 0
+ ASSERT(FIB_NODE_TYPE_PATH_LIST == node->fn_type);
+#endif
+ return ((fib_path_list_t*)node);
+}
+
+static fib_node_index_t
+fib_path_list_get_index (fib_path_list_t *path_list)
+{
+ return (path_list - fib_path_list_pool);
+}
+
+static u8 *
+format_fib_path_list (u8 * s, va_list * args)
+{
+ fib_path_list_attribute_t attr;
+ fib_node_index_t *path_index;
+ fib_path_list_t *path_list;
+
+ path_list = va_arg (*args, fib_path_list_t *);
+
+ s = format (s, " index:%u", fib_path_list_get_index(path_list));
+ s = format (s, " locks:%u", path_list->fpl_node.fn_locks);
+ s = format (s, " proto:%U", format_fib_protocol, path_list->fpl_nh_proto);
+
+ if (FIB_PATH_LIST_FLAG_NONE != path_list->fpl_flags)
+ {
+ s = format (s, " flags:");
+ FOR_EACH_PATH_LIST_ATTRIBUTE(attr)
+ {
+ if ((1<<attr) & path_list->fpl_flags)
+ {
+ s = format (s, "%s,", fib_path_list_attr_names[attr]);
+ }
+ }
+ }
+ s = format (s, " %U\n", format_fib_urpf_list, path_list->fpl_urpf);
+
+ vec_foreach (path_index, path_list->fpl_paths)
+ {
+ s = fib_path_format(*path_index, s);
+ s = format(s, "\n");
+ }
+
+ return (s);
+}
+
+u8 *
+fib_path_list_adjs_format (fib_node_index_t path_list_index,
+ u32 indent,
+ u8 * s)
+{
+ fib_path_list_t *path_list;
+ u32 i;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ vec_foreach_index (i, path_list->fpl_paths)
+ {
+ s = fib_path_adj_format(path_list->fpl_paths[i],
+ indent, s);
+ }
+
+ return (s);
+}
+
+
+u8 *
+fib_path_list_format (fib_node_index_t path_list_index,
+ u8 * s)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ return (format(s, "%U", format_fib_path_list, path_list));
+}
+
+static uword
+fib_path_list_hash (fib_path_list_t *path_list)
+{
+ uword old_path_list_hash, new_path_list_hash, path_hash;
+ fib_node_index_t *path_index;
+
+ ASSERT(path_list);
+
+ new_path_list_hash = old_path_list_hash = vec_len(path_list->fpl_paths);
+
+ vec_foreach (path_index, path_list->fpl_paths)
+ {
+ path_hash = fib_path_hash(*path_index);
+#if uword_bits == 64
+ hash_mix64(path_hash, old_path_list_hash, new_path_list_hash);
+#else
+ hash_mix32(path_hash, old_path_list_hash, new_path_list_hash);
+#endif
+ }
+
+ return (new_path_list_hash);
+}
+
+always_inline uword
+fib_path_list_db_hash_key_from_index (uword index)
+{
+ return 1 + 2*index;
+}
+
+always_inline uword
+fib_path_list_db_hash_key_is_index (uword key)
+{
+ return key & 1;
+}
+
+always_inline uword
+fib_path_list_db_hash_key_2_index (uword key)
+{
+ ASSERT (fib_path_list_db_hash_key_is_index (key));
+ return key / 2;
+}
+
+static fib_path_list_t*
+fib_path_list_db_get_from_hash_key (uword key)
+{
+ fib_path_list_t *path_list;
+
+ if (fib_path_list_db_hash_key_is_index (key))
+ {
+ fib_node_index_t path_list_index;
+
+ path_list_index = fib_path_list_db_hash_key_2_index(key);
+ path_list = fib_path_list_get(path_list_index);
+ }
+ else
+ {
+ path_list = uword_to_pointer (key, fib_path_list_t *);
+ }
+
+ return (path_list);
+}
+
+static uword
+fib_path_list_db_hash_key_sum (hash_t * h,
+ uword key)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_db_get_from_hash_key(key);
+
+ return (fib_path_list_hash(path_list));
+}
+
+static uword
+fib_path_list_db_hash_key_equal (hash_t * h,
+ uword key1,
+ uword key2)
+{
+ fib_path_list_t *path_list1, *path_list2;
+
+ path_list1 = fib_path_list_db_get_from_hash_key(key1);
+ path_list2 = fib_path_list_db_get_from_hash_key(key2);
+
+ return (fib_path_list_hash(path_list1) ==
+ fib_path_list_hash(path_list2));
+}
+
+static fib_node_index_t
+fib_path_list_db_find (fib_path_list_t *path_list)
+{
+ uword *p;
+
+ p = hash_get(fib_path_list_db, path_list);
+
+ if (NULL != p)
+ {
+ return p[0];
+ }
+
+ return (FIB_NODE_INDEX_INVALID);
+}
+
+static void
+fib_path_list_db_insert (fib_node_index_t path_list_index)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ ASSERT(FIB_NODE_INDEX_INVALID == fib_path_list_db_find(path_list));
+
+ hash_set (fib_path_list_db,
+ fib_path_list_db_hash_key_from_index(path_list_index),
+ path_list_index);
+
+ FIB_PATH_LIST_DBG(path_list, "DB-inserted");
+}
+
+static void
+fib_path_list_db_remove (fib_node_index_t path_list_index)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ ASSERT(FIB_NODE_INDEX_INVALID != fib_path_list_db_find(path_list));
+
+ hash_unset(fib_path_list_db,
+ fib_path_list_db_hash_key_from_index(path_list_index));
+
+ FIB_PATH_LIST_DBG(path_list, "DB-removed");
+}
+
+static void
+fib_path_list_destroy (fib_path_list_t *path_list)
+{
+ fib_node_index_t *path_index;
+
+ FIB_PATH_LIST_DBG(path_list, "destroy");
+
+ vec_foreach (path_index, path_list->fpl_paths)
+ {
+ fib_path_destroy(*path_index);
+ }
+
+ vec_free(path_list->fpl_paths);
+ fib_urpf_list_unlock(path_list->fpl_urpf);
+
+ fib_node_deinit(&path_list->fpl_node);
+ pool_put(fib_path_list_pool, path_list);
+}
+
+static void
+fib_path_list_last_lock_gone (fib_node_t *node)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_from_fib_node(node);
+
+ FIB_PATH_LIST_DBG(path_list, "last-lock");
+
+ if (path_list->fpl_flags & FIB_PATH_LIST_FLAG_SHARED)
+ {
+ fib_path_list_db_remove(fib_path_list_get_index(path_list));
+ }
+ fib_path_list_destroy(path_list);
+}
+
+/*
+ * fib_path_mk_lb
+ *
+ * update the multipath adj this path-list will contribute to its
+ * children's forwarding.
+ */
+static void
+fib_path_list_mk_lb (fib_path_list_t *path_list,
+ fib_forward_chain_type_t fct,
+ dpo_id_t *dpo)
+{
+ load_balance_path_t *hash_key;
+ fib_node_index_t *path_index;
+
+ hash_key = NULL;
+
+ if (!dpo_id_is_valid(dpo))
+ {
+ /*
+ * first time create
+ */
+ dpo_set(dpo,
+ DPO_LOAD_BALANCE,
+ fib_forw_chain_type_to_dpo_proto(fct),
+ load_balance_create(0,
+ fib_forw_chain_type_to_dpo_proto(fct),
+ 0 /* FIXME FLOW HASH */));
+ }
+
+ /*
+ * We gather the DPOs from resolved paths.
+ */
+ vec_foreach (path_index, path_list->fpl_paths)
+ {
+ hash_key = fib_path_append_nh_for_multipath_hash(
+ *path_index,
+ fct,
+ hash_key);
+ }
+
+ /*
+ * Path-list load-balances, which if used, would be shared and hence
+ * never need a load-balance map.
+ */
+ load_balance_multipath_update(dpo, hash_key, LOAD_BALANCE_FLAG_NONE);
+
+ FIB_PATH_LIST_DBG(path_list, "mk lb: %d", dpo->dpoi_index);
+
+ vec_free(hash_key);
+}
+
+/**
+ * @brief [re]build the path list's uRPF list
+ */
+static void
+fib_path_list_mk_urpf (fib_path_list_t *path_list)
+{
+ fib_node_index_t *path_index;
+
+ /*
+ * ditch the old one. by iterating through all paths we are going
+ * to re-find all the adjs that were in the old one anyway. If we
+ * keep the old one, then the |sort|uniq requires more work.
+ * All users of the RPF list have their own lock, so we can release
+ * immediately.
+ */
+ fib_urpf_list_unlock(path_list->fpl_urpf);
+ path_list->fpl_urpf = fib_urpf_list_alloc_and_lock();
+
+ vec_foreach (path_index, path_list->fpl_paths)
+ {
+ fib_path_contribute_urpf(*path_index, path_list->fpl_urpf);
+ }
+
+ fib_urpf_list_bake(path_list->fpl_urpf);
+}
+
+/**
+ * @brief Contribute (add) this path list's uRPF list. This allows the child
+ * to construct an aggregate list.
+ */
+void
+fib_path_list_contribute_urpf (fib_node_index_t path_list_index,
+ index_t urpf)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ fib_urpf_list_combine(urpf, path_list->fpl_urpf);
+}
+
+/**
+ * @brief Return the the child the RPF list pre-built for this path list
+ */
+index_t
+fib_path_list_get_urpf (fib_node_index_t path_list_index)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ return (path_list->fpl_urpf);
+}
+
+/*
+ * fib_path_list_back_walk
+ *
+ * Called from one of this path-list's paths to progate
+ * a back walk
+ */
+void
+fib_path_list_back_walk (fib_node_index_t path_list_index,
+ fib_node_back_walk_ctx_t *ctx)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ fib_path_list_mk_urpf(path_list);
+
+ /*
+ * propagate the backwalk further
+ */
+ if (32 >= fib_node_list_get_size(path_list->fpl_node.fn_children))
+ {
+ /*
+ * only a few children. continue the walk synchronously
+ */
+ fib_walk_sync(FIB_NODE_TYPE_PATH_LIST, path_list_index, ctx);
+ }
+ else
+ {
+ /*
+ * many children. schedule a async walk
+ */
+ fib_walk_async(FIB_NODE_TYPE_PATH_LIST,
+ path_list_index,
+ FIB_WALK_PRIORITY_LOW,
+ ctx);
+ }
+}
+
+/*
+ * fib_path_list_back_walk_notify
+ *
+ * A back walk has reach this path-list.
+ */
+static fib_node_back_walk_rc_t
+fib_path_list_back_walk_notify (fib_node_t *node,
+ fib_node_back_walk_ctx_t *ctx)
+{
+ /*
+ * the path-list is not a direct child of any other node type
+ * paths, which do not change thier to-list-mapping, save the
+ * list they are a member of, and invoke the BW function directly.
+ */
+ ASSERT(0);
+
+ return (FIB_NODE_BACK_WALK_CONTINUE);
+}
+
+/*
+ * Display the path-list memory usage
+ */
+static void
+fib_path_list_memory_show (void)
+{
+ fib_show_memory_usage("Path-list",
+ pool_elts(fib_path_list_pool),
+ pool_len(fib_path_list_pool),
+ sizeof(fib_path_list_t));
+ fib_urpf_list_show_mem();
+}
+
+/*
+ * The FIB path-list's graph node virtual function table
+ */
+static const fib_node_vft_t fib_path_list_vft = {
+ .fnv_get = fib_path_list_get_node,
+ .fnv_last_lock = fib_path_list_last_lock_gone,
+ .fnv_back_walk = fib_path_list_back_walk_notify,
+ .fnv_mem_show = fib_path_list_memory_show,
+};
+
+static fib_path_list_t *
+fib_path_list_alloc (fib_node_index_t *path_list_index)
+{
+ fib_path_list_t *path_list;
+
+ pool_get(fib_path_list_pool, path_list);
+ memset(path_list, 0, sizeof(*path_list));
+
+ fib_node_init(&path_list->fpl_node,
+ FIB_NODE_TYPE_PATH_LIST);
+ path_list->fpl_urpf = INDEX_INVALID;
+
+ if (NULL != path_list_index)
+ {
+ *path_list_index = fib_path_list_get_index(path_list);
+ }
+
+ FIB_PATH_LIST_DBG(path_list, "alloc");
+
+ return (path_list);
+}
+
+static fib_path_list_t *
+fib_path_list_resolve (fib_path_list_t *path_list)
+{
+ fib_node_index_t *path_index, *paths, path_list_index;
+
+ ASSERT(!(path_list->fpl_flags & FIB_PATH_LIST_FLAG_RESOLVED));
+
+ /*
+ * resolving a path-list is a recursive action. this means more path
+ * lists can be created during this call, and hence this path-list
+ * can be realloc'd. so we work with copies.
+ * this function is called only once per-path list, so its no great overhead.
+ */
+ path_list_index = fib_path_list_get_index(path_list);
+ paths = vec_dup(path_list->fpl_paths);
+
+ vec_foreach (path_index, paths)
+ {
+ fib_path_resolve(*path_index);
+ }
+
+ vec_free(paths);
+ path_list = fib_path_list_get(path_list_index);
+
+ FIB_PATH_LIST_DBG(path_list, "resovled");
+ fib_path_list_mk_urpf(path_list);
+
+ return (path_list);
+}
+
+u32
+fib_path_list_get_resolving_interface (fib_node_index_t path_list_index)
+{
+ fib_node_index_t *path_index;
+ fib_path_list_t *path_list;
+ u32 sw_if_index;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ sw_if_index = ~0;
+ vec_foreach (path_index, path_list->fpl_paths)
+ {
+ sw_if_index = fib_path_get_resolving_interface(*path_index);
+ if (~0 != sw_if_index)
+ {
+ return (sw_if_index);
+ }
+ }
+
+ return (sw_if_index);
+}
+
+fib_protocol_t
+fib_path_list_get_proto (fib_node_index_t path_list_index)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ /*
+ * we don't support a mix of path protocols, so we can return the proto
+ * of the first
+ */
+ return (fib_path_get_proto(path_list->fpl_paths[0]));
+}
+
+int
+fib_path_list_is_looped (fib_node_index_t path_list_index)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ return (path_list->fpl_flags & FIB_PATH_LIST_FLAG_LOOPED);
+}
+
+static fib_path_cfg_flags_t
+fib_path_list_flags_2_path_flags (fib_path_list_flags_t plf)
+{
+ fib_path_cfg_flags_t pf = FIB_PATH_CFG_FLAG_NONE;
+
+ if (plf & FIB_PATH_LIST_FLAG_LOCAL)
+ {
+ pf |= FIB_PATH_CFG_FLAG_LOCAL;
+ }
+ if (plf & FIB_PATH_LIST_FLAG_DROP)
+ {
+ pf |= FIB_PATH_CFG_FLAG_DROP;
+ }
+ if (plf & FIB_PATH_LIST_FLAG_EXCLUSIVE)
+ {
+ pf |= FIB_PATH_CFG_FLAG_EXCLUSIVE;
+ }
+
+ return (pf);
+}
+
+static fib_path_list_flags_t
+fib_path_list_flags_fixup (fib_path_list_flags_t flags)
+{
+ /*
+ * we do no share drop nor exclusive path-lists
+ */
+ if (flags & FIB_PATH_LIST_FLAG_DROP ||
+ flags & FIB_PATH_LIST_FLAG_EXCLUSIVE)
+ {
+ flags &= ~FIB_PATH_LIST_FLAG_SHARED;
+ }
+
+ return (flags);
+}
+
+fib_node_index_t
+fib_path_list_create (fib_path_list_flags_t flags,
+ const fib_route_path_t *rpaths)
+{
+ fib_node_index_t path_list_index, old_path_list_index;
+ fib_path_list_t *path_list;
+ int i;
+
+ flags = fib_path_list_flags_fixup(flags);
+ path_list = fib_path_list_alloc(&path_list_index);
+ path_list->fpl_flags = flags;
+ /*
+ * we'll assume for now all paths are the same next-hop protocol
+ */
+ path_list->fpl_nh_proto = rpaths[0].frp_proto;
+
+ vec_foreach_index(i, rpaths)
+ {
+ vec_add1(path_list->fpl_paths,
+ fib_path_create(path_list_index,
+ path_list->fpl_nh_proto,
+ fib_path_list_flags_2_path_flags(flags),
+ &rpaths[i]));
+ }
+
+ /*
+ * If a shared path list is requested, consult the DB for a match
+ */
+ if (flags & FIB_PATH_LIST_FLAG_SHARED)
+ {
+ /*
+ * check for a matching path-list in the DB.
+ * If we find one then we can return the existing one and destroy the
+ * new one just created.
+ */
+ old_path_list_index = fib_path_list_db_find(path_list);
+ if (FIB_NODE_INDEX_INVALID != old_path_list_index)
+ {
+ fib_path_list_destroy(path_list);
+
+ path_list_index = old_path_list_index;
+ }
+ else
+ {
+ /*
+ * if there was not a matching path-list, then this
+ * new one will need inserting into the DB and resolving.
+ */
+ fib_path_list_db_insert(path_list_index);
+ path_list = fib_path_list_resolve(path_list);
+ }
+ }
+ else
+ {
+ /*
+ * no shared path list requested. resolve and use the one
+ * just created.
+ */
+ path_list = fib_path_list_resolve(path_list);
+ }
+
+ return (path_list_index);
+}
+
+fib_node_index_t
+fib_path_list_create_special (fib_protocol_t nh_proto,
+ fib_path_list_flags_t flags,
+ const dpo_id_t *dpo)
+{
+ fib_node_index_t path_index, path_list_index;
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_alloc(&path_list_index);
+ path_list->fpl_flags = flags;
+ path_list->fpl_nh_proto = nh_proto;
+
+ path_index =
+ fib_path_create_special(path_list_index,
+ path_list->fpl_nh_proto,
+ fib_path_list_flags_2_path_flags(flags),
+ dpo);
+ vec_add1(path_list->fpl_paths, path_index);
+
+ /*
+ * we don't share path-lists. we can do PIC on them so why bother.
+ */
+ path_list = fib_path_list_resolve(path_list);
+
+ return (path_list_index);
+}
+
+/*
+ * fib_path_list_copy_and_path_add
+ *
+ * Create a copy of a path-list and append one more path to it.
+ * The path-list returned could either have been newly created, or
+ * can be a shared path-list from the data-base.
+ */
+fib_node_index_t
+fib_path_list_copy_and_path_add (fib_node_index_t orig_path_list_index,
+ fib_path_list_flags_t flags,
+ const fib_route_path_t *rpaths)
+{
+ fib_node_index_t path_index, new_path_index, *orig_path_index;
+ fib_path_list_t *path_list, *orig_path_list;
+ fib_node_index_t path_list_index;
+ fib_node_index_t pi;
+
+ ASSERT(1 == vec_len(rpaths));
+
+ /*
+ * alloc the new list before we retrieve the old one, lest
+ * the alloc result in a realloc
+ */
+ path_list = fib_path_list_alloc(&path_list_index);
+
+ orig_path_list = fib_path_list_get(orig_path_list_index);
+
+ FIB_PATH_LIST_DBG(orig_path_list, "copy-add");
+
+ flags = fib_path_list_flags_fixup(flags);
+ path_list->fpl_flags = flags;
+ path_list->fpl_nh_proto = orig_path_list->fpl_nh_proto;
+ vec_validate(path_list->fpl_paths, vec_len(orig_path_list->fpl_paths));
+ pi = 0;
+
+ new_path_index = fib_path_create(path_list_index,
+ path_list->fpl_nh_proto,
+ fib_path_list_flags_2_path_flags(flags),
+ rpaths);
+
+ vec_foreach (orig_path_index, orig_path_list->fpl_paths)
+ {
+ /*
+ * don't add duplicate paths
+ * In the unlikely event the path is a duplicate, then we'll
+ * find a matching path-list later and this one will be toast.
+ */
+ if (0 != fib_path_cmp(new_path_index, *orig_path_index))
+ {
+ path_index = fib_path_copy(*orig_path_index, path_list_index);
+ path_list->fpl_paths[pi++] = path_index;
+ }
+ else
+ {
+ _vec_len(path_list->fpl_paths) = vec_len(orig_path_list->fpl_paths);
+ }
+ }
+
+ path_list->fpl_paths[pi] = new_path_index;
+
+ /*
+ * we sort the paths since the key for the path-list is
+ * the description of the paths it contains. The paths need to
+ * be sorted else this description will differ.
+ */
+ vec_sort_with_function(path_list->fpl_paths, fib_path_cmp_for_sort);
+
+ FIB_PATH_LIST_DBG(path_list, "path-added");
+
+ /*
+ * If a shared path list is requested, consult the DB for a match
+ */
+ if (path_list->fpl_flags & FIB_PATH_LIST_FLAG_SHARED)
+ {
+ fib_node_index_t exist_path_list_index;
+ /*
+ * check for a matching path-list in the DB.
+ * If we find one then we can return the existing one and destroy the
+ * new one just created.
+ */
+ exist_path_list_index = fib_path_list_db_find(path_list);
+ if (FIB_NODE_INDEX_INVALID != exist_path_list_index)
+ {
+ fib_path_list_destroy(path_list);
+
+ path_list_index = exist_path_list_index;
+ }
+ else
+ {
+ /*
+ * if there was not a matching path-list, then this
+ * new one will need inserting into the DB and resolving.
+ */
+ fib_path_list_db_insert(path_list_index);
+
+ path_list = fib_path_list_resolve(path_list);
+ }
+ }
+ else
+ {
+ /*
+ * no shared path list requested. resolve and use the one
+ * just created.
+ */
+ path_list = fib_path_list_resolve(path_list);
+ }
+
+ return (path_list_index);
+}
+
+/*
+ * fib_path_list_copy_and_path_remove
+ *
+ * Copy the path-list excluding the path passed.
+ * If the path is the last one, then the index reurned will be invalid.
+ * i.e. the path-list is toast.
+ */
+fib_node_index_t
+fib_path_list_copy_and_path_remove (fib_node_index_t orig_path_list_index,
+ fib_path_list_flags_t flags,
+ const fib_route_path_t *rpaths)
+{
+ fib_node_index_t path_index, *orig_path_index, path_list_index, tmp_path_index;
+ fib_path_list_t *path_list, *orig_path_list;
+ fib_node_index_t pi;
+
+ ASSERT(1 == vec_len(rpaths));
+
+ path_list = fib_path_list_alloc(&path_list_index);
+
+ flags = fib_path_list_flags_fixup(flags);
+ orig_path_list = fib_path_list_get(orig_path_list_index);
+
+ FIB_PATH_LIST_DBG(orig_path_list, "copy-remove");
+
+ path_list->fpl_flags = flags;
+ path_list->fpl_nh_proto = orig_path_list->fpl_nh_proto;
+ /*
+ * allocate as many paths as we might need in one go, rather than
+ * using vec_add to do a few at a time.
+ */
+ if (vec_len(orig_path_list->fpl_paths) > 1)
+ {
+ vec_validate(path_list->fpl_paths, vec_len(orig_path_list->fpl_paths) - 2);
+ }
+ pi = 0;
+
+ /*
+ * create a representation of the path to be removed, so it
+ * can be used as a comparison object during the copy.
+ */
+ tmp_path_index = fib_path_create(path_list_index,
+ path_list->fpl_nh_proto,
+ fib_path_list_flags_2_path_flags(flags),
+ rpaths);
+
+ vec_foreach (orig_path_index, orig_path_list->fpl_paths)
+ {
+ if (0 != fib_path_cmp(tmp_path_index, *orig_path_index)) {
+ path_index = fib_path_copy(*orig_path_index, path_list_index);
+ if (pi < vec_len(path_list->fpl_paths))
+ {
+ path_list->fpl_paths[pi++] = path_index;
+ }
+ else
+ {
+ /*
+ * this is the unlikely case that the path being
+ * removed does not match one in the path-list, so
+ * we end up with as many paths as we started with.
+ * the paths vector was sized above with the expectation
+ * that we would have 1 less.
+ */
+ vec_add1(path_list->fpl_paths, path_index);
+ }
+ }
+ }
+
+ /*
+ * done with the temporary now
+ */
+ fib_path_destroy(tmp_path_index);
+
+ /*
+ * if there are no paths, then the new path-list is aborted
+ */
+ if (0 == vec_len(path_list->fpl_paths)) {
+ FIB_PATH_LIST_DBG(path_list, "last-path-removed");
+
+ fib_path_list_destroy(path_list);
+
+ path_list_index = FIB_NODE_INDEX_INVALID;
+ } else {
+ /*
+ * we sort the paths since the key for the path-list is
+ * the description of the paths it contains. The paths need to
+ * be sorted else this description will differ.
+ */
+ vec_sort_with_function(path_list->fpl_paths, fib_path_cmp_for_sort);
+
+ /*
+ * If a shared path list is requested, consult the DB for a match
+ */
+ if (path_list->fpl_flags & FIB_PATH_LIST_FLAG_SHARED)
+ {
+ fib_node_index_t exist_path_list_index;
+
+ /*
+ * check for a matching path-list in the DB.
+ * If we find one then we can return the existing one and destroy the
+ * new one just created.
+ */
+ exist_path_list_index = fib_path_list_db_find(path_list);
+ if (FIB_NODE_INDEX_INVALID != exist_path_list_index)
+ {
+ fib_path_list_destroy(path_list);
+
+ path_list_index = exist_path_list_index;
+ }
+ else
+ {
+ /*
+ * if there was not a matching path-list, then this
+ * new one will need inserting into the DB and resolving.
+ */
+ fib_path_list_db_insert(path_list_index);
+
+ path_list = fib_path_list_resolve(path_list);
+ }
+ }
+ else
+ {
+ /*
+ * no shared path list requested. resolve and use the one
+ * just created.
+ */
+ path_list = fib_path_list_resolve(path_list);
+ }
+ }
+
+ return (path_list_index);
+}
+
+/*
+ * fib_path_list_contribute_forwarding
+ *
+ * Return the index of a load-balance that user of this path-list should
+ * use for forwarding
+ */
+void
+fib_path_list_contribute_forwarding (fib_node_index_t path_list_index,
+ fib_forward_chain_type_t type,
+ dpo_id_t *dpo)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ fib_path_list_mk_lb(path_list, type, dpo);
+}
+
+/*
+ * fib_path_list_get_adj
+ *
+ * Return the index of a adjacency for the first path that user of this
+ * path-list should use for forwarding
+ */
+adj_index_t
+fib_path_list_get_adj (fib_node_index_t path_list_index,
+ fib_forward_chain_type_t type)
+{
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+ return (fib_path_get_adj(path_list->fpl_paths[0]));
+}
+
+int
+fib_path_list_recursive_loop_detect (fib_node_index_t path_list_index,
+ fib_node_index_t **entry_indicies)
+{
+ fib_node_index_t *path_index;
+ int is_looped, list_looped;
+ fib_path_list_t *path_list;
+
+ list_looped = 0;
+ path_list = fib_path_list_get(path_list_index);
+
+ vec_foreach (path_index, path_list->fpl_paths)
+ {
+ fib_node_index_t *copy, **copy_ptr;
+
+ /*
+ * we need a copy of the nodes visited so that when we add entries
+ * we explore on the nth path and a looped is detected, those entries
+ * are not again searched for n+1 path and so finding a loop that does
+ * not exist.
+ */
+ copy = vec_dup(*entry_indicies);
+ copy_ptr = &copy;
+
+ is_looped = fib_path_recursive_loop_detect(*path_index, copy_ptr);
+ list_looped += is_looped;
+ }
+
+ FIB_PATH_LIST_DBG(path_list, "loop-detect: eval:%d", eval);
+
+ if (list_looped)
+ {
+ path_list->fpl_flags |= FIB_PATH_LIST_FLAG_LOOPED;
+ }
+ else
+ {
+ path_list->fpl_flags &= ~FIB_PATH_LIST_FLAG_LOOPED;
+ }
+
+ return (list_looped);
+}
+
+u32
+fib_path_list_child_add (fib_node_index_t path_list_index,
+ fib_node_type_t child_type,
+ fib_node_index_t child_index)
+{
+ return (fib_node_child_add(FIB_NODE_TYPE_PATH_LIST,
+ path_list_index,
+ child_type,
+ child_index));
+}
+
+void
+fib_path_list_child_remove (fib_node_index_t path_list_index,
+ u32 si)
+{
+ fib_node_child_remove(FIB_NODE_TYPE_PATH_LIST,
+ path_list_index,
+ si);
+}
+
+void
+fib_path_list_lock(fib_node_index_t path_list_index)
+{
+ fib_path_list_t *path_list;
+
+ if (FIB_NODE_INDEX_INVALID != path_list_index)
+ {
+ path_list = fib_path_list_get(path_list_index);
+
+ fib_node_lock(&path_list->fpl_node);
+ FIB_PATH_LIST_DBG(path_list, "lock");
+ }
+}
+
+void
+fib_path_list_unlock (fib_node_index_t path_list_index)
+{
+ fib_path_list_t *path_list;
+
+ if (FIB_NODE_INDEX_INVALID != path_list_index)
+ {
+ path_list = fib_path_list_get(path_list_index);
+ FIB_PATH_LIST_DBG(path_list, "unlock");
+
+ fib_node_unlock(&path_list->fpl_node);
+ }
+}
+
+u32
+fib_path_list_pool_size (void)
+{
+ return (pool_elts(fib_path_list_pool));
+}
+
+u32
+fib_path_list_db_size (void)
+{
+ return (hash_elts(fib_path_list_db));
+}
+
+void
+fib_path_list_walk (fib_node_index_t path_list_index,
+ fib_path_list_walk_fn_t func,
+ void *ctx)
+{
+ fib_node_index_t *path_index;
+ fib_path_list_t *path_list;
+
+ path_list = fib_path_list_get(path_list_index);
+
+ vec_foreach(path_index, path_list->fpl_paths)
+ {
+ if (!func(path_list_index, *path_index, ctx))
+ break;
+ }
+}
+
+
+void
+fib_path_list_module_init (void)
+{
+ fib_node_register_type (FIB_NODE_TYPE_PATH_LIST, &fib_path_list_vft);
+
+ fib_path_list_db = hash_create2 (/* elts */ 0,
+ /* user */ 0,
+ /* value_bytes */ sizeof (fib_node_index_t),
+ fib_path_list_db_hash_key_sum,
+ fib_path_list_db_hash_key_equal,
+ /* format pair/arg */
+ 0, 0);
+}
+
+static clib_error_t *
+show_fib_path_list_command (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ fib_path_list_t *path_list;
+ fib_node_index_t pli;
+
+ if (unformat (input, "%d", &pli))
+ {
+ /*
+ * show one in detail
+ */
+ if (!pool_is_free_index(fib_path_list_pool, pli))
+ {
+ path_list = fib_path_list_get(pli);
+ u8 *s = fib_path_list_format(pli, NULL);
+ s = format(s, "children:");
+ s = fib_node_children_format(path_list->fpl_node.fn_children, s);
+ vlib_cli_output (vm, "%s", s);
+ vec_free(s);
+ }
+ else
+ {
+ vlib_cli_output (vm, "path list %d invalid", pli);
+ }
+ }
+ else
+ {
+ /*
+ * show all
+ */
+ vlib_cli_output (vm, "FIB Path Lists");
+ pool_foreach(path_list, fib_path_list_pool,
+ ({
+ vlib_cli_output (vm, "%U", format_fib_path_list, path_list);
+ }));
+ }
+ return (NULL);
+}
+
+VLIB_CLI_COMMAND (show_fib_path_list, static) = {
+ .path = "show fib path-lists",
+ .function = show_fib_path_list_command,
+ .short_help = "show fib path-lists",
+};