Gitiles
Code Review Sign In
gerrit.nordix.org / fdio / vpp / 1043fd38d83434d6c4e002c5354a30027988fbfa / . / src / vnet / fib / fib_entry.c
blob: 0e5482840bfb6b5d191e34104ac7258e24ee5147 [file] [log] [blame]
/*
* 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/ip/format.h>
#include <vnet/ip/lookup.h>
#include <vnet/adj/adj.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/dpo/drop_dpo.h>
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/fib_walk.h>
#include <vnet/fib/fib_entry_src.h>
#include <vnet/fib/fib_entry_cover.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_internal.h>
#include <vnet/fib/fib_attached_export.h>
#include <vnet/fib/fib_path_ext.h>
#include <vnet/fib/fib_entry_delegate.h>
#include <vnet/fib/fib_entry_track.h>
/*
* Array of strings/names for the FIB sources
*/
static const char *fib_attribute_names[] = FIB_ENTRY_ATTRIBUTES;
static const char *fib_src_attribute_names[] = FIB_ENTRY_SRC_ATTRIBUTES;
/*
* Pool for all fib_entries
*/
static fib_entry_t *fib_entry_pool;
/**
* the logger
*/
vlib_log_class_t fib_entry_logger;
fib_entry_t *
fib_entry_get (fib_node_index_t index)
{
return (pool_elt_at_index(fib_entry_pool, index));
}
static fib_node_t *
fib_entry_get_node (fib_node_index_t index)
{
return ((fib_node_t*)fib_entry_get(index));
}
fib_node_index_t
fib_entry_get_index (const fib_entry_t * fib_entry)
{
return (fib_entry - fib_entry_pool);
}
fib_protocol_t
fib_entry_get_proto (const fib_entry_t * fib_entry)
{
return (fib_entry->fe_prefix.fp_proto);
}
dpo_proto_t
fib_entry_get_dpo_proto (const fib_entry_t * fib_entry)
{
return (fib_proto_to_dpo(fib_entry->fe_prefix.fp_proto));
}
fib_forward_chain_type_t
fib_entry_get_default_chain_type (const fib_entry_t *fib_entry)
{
switch (fib_entry->fe_prefix.fp_proto)
{
case FIB_PROTOCOL_IP4:
return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4);
case FIB_PROTOCOL_IP6:
return (FIB_FORW_CHAIN_TYPE_UNICAST_IP6);
case FIB_PROTOCOL_MPLS:
if (MPLS_EOS == fib_entry->fe_prefix.fp_eos)
return (FIB_FORW_CHAIN_TYPE_MPLS_EOS);
else
return (FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS);
}
return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4);
}
u8 *
format_fib_entry_flags (u8 *s, va_list *args)
{
fib_entry_attribute_t attr;
fib_entry_flag_t flag = va_arg(*args, int);
FOR_EACH_FIB_ATTRIBUTE(attr) {
if ((1<<attr) & flag) {
s = format (s, "%s,", fib_attribute_names[attr]);
}
}
return (s);
}
u8 *
format_fib_entry_src_flags (u8 *s, va_list *args)
{
fib_entry_src_attribute_t sattr;
fib_entry_src_flag_t flag = va_arg(*args, int);
FOR_EACH_FIB_SRC_ATTRIBUTE(sattr) {
if ((1<<sattr) & flag) {
s = format (s, "%s,", fib_src_attribute_names[sattr]);
}
}
return (s);
}
u8 *
format_fib_entry (u8 * s, va_list * args)
{
fib_forward_chain_type_t fct;
fib_entry_t *fib_entry;
fib_entry_src_t *src;
fib_node_index_t fei;
fib_source_t source;
int level;
fei = va_arg (*args, fib_node_index_t);
level = va_arg (*args, int);
fib_entry = fib_entry_get(fei);
s = format (s, "%U", format_fib_prefix, &fib_entry->fe_prefix);
if (level >= FIB_ENTRY_FORMAT_DETAIL)
{
s = format (s, " fib:%d", fib_entry->fe_fib_index);
s = format (s, " index:%d", fib_entry_get_index(fib_entry));
s = format (s, " locks:%d", fib_entry->fe_node.fn_locks);
FOR_EACH_SRC_ADDED(fib_entry, src, source,
({
s = format (s, "\n %U", format_fib_source, source);
s = format (s, " refs:%d", src->fes_ref_count);
if (FIB_ENTRY_FLAG_NONE != src->fes_entry_flags) {
s = format(s, " entry-flags:%U",
format_fib_entry_flags, src->fes_entry_flags);
}
if (FIB_ENTRY_SRC_FLAG_NONE != src->fes_flags) {
s = format(s, " src-flags:%U",
format_fib_entry_src_flags, src->fes_flags);
}
s = fib_entry_src_format(fib_entry, source, s);
s = format (s, "\n");
if (FIB_NODE_INDEX_INVALID != src->fes_pl)
{
s = fib_path_list_format(src->fes_pl, s);
}
s = format(s, "%U", format_fib_path_ext_list, &src->fes_path_exts);
}));
s = format (s, "\n forwarding: ");
}
else
{
s = format (s, "\n");
}
fct = fib_entry_get_default_chain_type(fib_entry);
if (!dpo_id_is_valid(&fib_entry->fe_lb))
{
s = format (s, " UNRESOLVED\n");
return (s);
}
else
{
s = format(s, " %U-chain\n %U",
format_fib_forw_chain_type, fct,
format_dpo_id,
&fib_entry->fe_lb,
2);
s = format(s, "\n");
if (level >= FIB_ENTRY_FORMAT_DETAIL2)
{
index_t *fedi;
s = format (s, " Delegates:\n");
vec_foreach(fedi, fib_entry->fe_delegates)
{
s = format(s, " %U\n", format_fib_entry_delegate, *fedi);
}
}
}
if (level >= FIB_ENTRY_FORMAT_DETAIL2)
{
s = format(s, " Children:");
s = fib_node_children_format(fib_entry->fe_node.fn_children, s);
}
return (s);
}
static fib_entry_t*
fib_entry_from_fib_node (fib_node_t *node)
{
ASSERT(FIB_NODE_TYPE_ENTRY == node->fn_type);
return ((fib_entry_t*)node);
}
static void
fib_entry_last_lock_gone (fib_node_t *node)
{
fib_entry_delegate_type_t fdt;
fib_entry_delegate_t *fed;
fib_entry_t *fib_entry;
fib_entry = fib_entry_from_fib_node(node);
ASSERT(!dpo_id_is_valid(&fib_entry->fe_lb));
FOR_EACH_DELEGATE_CHAIN(fib_entry, fdt, fed,
{
dpo_reset(&fed->fd_dpo);
fib_entry_delegate_remove(fib_entry, fdt);
});
FIB_ENTRY_DBG(fib_entry, "last-lock");
fib_node_deinit(&fib_entry->fe_node);
ASSERT(0 == vec_len(fib_entry->fe_delegates));
vec_free(fib_entry->fe_delegates);
vec_free(fib_entry->fe_srcs);
pool_put(fib_entry_pool, fib_entry);
}
static fib_entry_src_t*
fib_entry_get_best_src_i (const fib_entry_t *fib_entry)
{
fib_entry_src_t *bsrc;
/*
* the enum of sources is deliberately arranged in priority order
*/
if (0 == vec_len(fib_entry->fe_srcs))
{
bsrc = NULL;
}
else
{
bsrc = vec_elt_at_index(fib_entry->fe_srcs, 0);
}
return (bsrc);
}
static fib_source_t
fib_entry_src_get_source (const fib_entry_src_t *esrc)
{
if (NULL != esrc)
{
return (esrc->fes_src);
}
return (FIB_SOURCE_INVALID);
}
static fib_entry_flag_t
fib_entry_src_get_flags (const fib_entry_src_t *esrc)
{
if (NULL != esrc)
{
return (esrc->fes_entry_flags);
}
return (FIB_ENTRY_FLAG_NONE);
}
fib_entry_flag_t
fib_entry_get_flags (fib_node_index_t fib_entry_index)
{
return (fib_entry_get_flags_i(fib_entry_get(fib_entry_index)));
}
/*
* fib_entry_back_walk_notify
*
* A back walk has reach this entry.
*/
static fib_node_back_walk_rc_t
fib_entry_back_walk_notify (fib_node_t *node,
fib_node_back_walk_ctx_t *ctx)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_from_fib_node(node);
if (FIB_NODE_BW_REASON_FLAG_EVALUATE & ctx->fnbw_reason ||
FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason ||
FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason ||
FIB_NODE_BW_REASON_FLAG_INTERFACE_UP & ctx->fnbw_reason ||
FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN & ctx->fnbw_reason ||
FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE & ctx->fnbw_reason)
{
fib_entry_src_action_reactivate(fib_entry,
fib_entry_get_best_source(
fib_entry_get_index(fib_entry)));
}
/*
* all other walk types can be reclassifed to a re-evaluate to
* all recursive dependents.
* By reclassifying we ensure that should any of these walk types meet
* they can be merged.
*/
ctx->fnbw_reason = FIB_NODE_BW_REASON_FLAG_EVALUATE;
/*
* ... and nothing is forced sync from now on.
*/
ctx->fnbw_flags &= ~FIB_NODE_BW_FLAG_FORCE_SYNC;
FIB_ENTRY_DBG(fib_entry, "bw:%U",
format_fib_node_bw_reason, ctx->fnbw_reason);
/*
* propagate the backwalk further if we haven't already reached the
* maximum depth.
*/
fib_walk_sync(FIB_NODE_TYPE_ENTRY,
fib_entry_get_index(fib_entry),
ctx);
return (FIB_NODE_BACK_WALK_CONTINUE);
}
static void
fib_entry_show_memory (void)
{
u32 n_srcs = 0, n_exts = 0;
fib_entry_src_t *esrc;
fib_entry_t *entry;
fib_show_memory_usage("Entry",
pool_elts(fib_entry_pool),
pool_len(fib_entry_pool),
sizeof(fib_entry_t));
pool_foreach(entry, fib_entry_pool,
({
n_srcs += vec_len(entry->fe_srcs);
vec_foreach(esrc, entry->fe_srcs)
{
n_exts += fib_path_ext_list_length(&esrc->fes_path_exts);
}
}));
fib_show_memory_usage("Entry Source",
n_srcs, n_srcs, sizeof(fib_entry_src_t));
fib_show_memory_usage("Entry Path-Extensions",
n_exts, n_exts,
sizeof(fib_path_ext_t));
}
/*
* The FIB path-list's graph node virtual function table
*/
static const fib_node_vft_t fib_entry_vft = {
.fnv_get = fib_entry_get_node,
.fnv_last_lock = fib_entry_last_lock_gone,
.fnv_back_walk = fib_entry_back_walk_notify,
.fnv_mem_show = fib_entry_show_memory,
};
/**
* @brief Contribute the set of Adjacencies that this entry forwards with
* to build the uRPF list of its children
*/
void
fib_entry_contribute_urpf (fib_node_index_t entry_index,
index_t urpf)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(entry_index);
return (fib_path_list_contribute_urpf(fib_entry->fe_parent, urpf));
}
/*
* If the client is request a chain for multicast forwarding then swap
* the chain type to one that can provide such transport.
*/
static fib_forward_chain_type_t
fib_entry_chain_type_mcast_to_ucast (fib_forward_chain_type_t fct)
{
switch (fct)
{
case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
/*
* we can only transport IP multicast packets if there is an
* LSP.
*/
fct = FIB_FORW_CHAIN_TYPE_MPLS_EOS;
break;
case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
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_ETHERNET:
case FIB_FORW_CHAIN_TYPE_NSH:
case FIB_FORW_CHAIN_TYPE_BIER:
break;
}
return (fct);
}
/*
* fib_entry_contribute_forwarding
*
* Get an lock the forwarding information (DPO) contributed by the FIB entry.
*/
void
fib_entry_contribute_forwarding (fib_node_index_t fib_entry_index,
fib_forward_chain_type_t fct,
dpo_id_t *dpo)
{
fib_entry_delegate_t *fed;
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
/*
* mfib children ask for mcast chains. fix these to the appropriate ucast types.
*/
fct = fib_entry_chain_type_mcast_to_ucast(fct);
if (fct == fib_entry_get_default_chain_type(fib_entry))
{
dpo_copy(dpo, &fib_entry->fe_lb);
}
else
{
fed = fib_entry_delegate_find(fib_entry,
fib_entry_chain_type_to_delegate_type(fct));
if (NULL == fed)
{
/*
* use a temporary DPO lest the delegate realloc in the recursive
* calculation.
*/
dpo_id_t tmp = DPO_INVALID;
/*
* on-demand create eos/non-eos.
* There is no on-demand delete because:
* - memory versus complexity & reliability:
* leaving unrequired [n]eos LB arounds wastes memory, cleaning
* then up on the right trigger is more code. i favour the latter.
*/
fib_entry_src_mk_lb(fib_entry,
fib_entry_get_best_src_i(fib_entry),
fct,
&tmp);
fed = fib_entry_delegate_find_or_add(
fib_entry,
fib_entry_chain_type_to_delegate_type(fct));
dpo_copy(&fed->fd_dpo, &tmp);
dpo_reset(&tmp);
}
dpo_copy(dpo, &fed->fd_dpo);
}
/*
* use the drop DPO is nothing else is present
*/
if (!dpo_id_is_valid(dpo))
{
dpo_copy(dpo, drop_dpo_get(fib_forw_chain_type_to_dpo_proto(fct)));
}
/*
* don't allow the special index indicating replicate.vs.load-balance
* to escape to the clients
*/
dpo->dpoi_index &= ~MPLS_IS_REPLICATE;
}
const dpo_id_t *
fib_entry_contribute_ip_forwarding (fib_node_index_t fib_entry_index)
{
fib_forward_chain_type_t fct;
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
fct = fib_entry_get_default_chain_type(fib_entry);
ASSERT((fct == FIB_FORW_CHAIN_TYPE_UNICAST_IP4 ||
fct == FIB_FORW_CHAIN_TYPE_UNICAST_IP6));
if (dpo_id_is_valid(&fib_entry->fe_lb))
{
return (&fib_entry->fe_lb);
}
return (drop_dpo_get(fib_forw_chain_type_to_dpo_proto(fct)));
}
adj_index_t
fib_entry_get_adj (fib_node_index_t fib_entry_index)
{
const dpo_id_t *dpo;
dpo = fib_entry_contribute_ip_forwarding(fib_entry_index);
if (dpo_id_is_valid(dpo))
{
dpo = load_balance_get_bucket(dpo->dpoi_index, 0);
if (dpo_is_adj(dpo))
{
return (dpo->dpoi_index);
}
}
return (ADJ_INDEX_INVALID);
}
fib_node_index_t
fib_entry_get_path_list (fib_node_index_t fib_entry_index)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
return (fib_entry->fe_parent);
}
u32
fib_entry_child_add (fib_node_index_t fib_entry_index,
fib_node_type_t child_type,
fib_node_index_t child_index)
{
return (fib_node_child_add(FIB_NODE_TYPE_ENTRY,
fib_entry_index,
child_type,
child_index));
};
void
fib_entry_child_remove (fib_node_index_t fib_entry_index,
u32 sibling_index)
{
fib_node_child_remove(FIB_NODE_TYPE_ENTRY,
fib_entry_index,
sibling_index);
if (0 == fib_node_get_n_children(FIB_NODE_TYPE_ENTRY,
fib_entry_index))
{
/*
* if there are no children left then there is no reason to keep
* the non-default forwarding chains. those chains are built only
* because the children want them.
*/
fib_entry_delegate_type_t fdt;
fib_entry_delegate_t *fed;
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
FOR_EACH_DELEGATE_CHAIN(fib_entry, fdt, fed,
{
dpo_reset(&fed->fd_dpo);
fib_entry_delegate_remove(fib_entry, fdt);
});
}
}
static fib_entry_t *
fib_entry_alloc (u32 fib_index,
const fib_prefix_t *prefix,
fib_node_index_t *fib_entry_index)
{
fib_entry_t *fib_entry;
fib_prefix_t *fep;
pool_get(fib_entry_pool, fib_entry);
clib_memset(fib_entry, 0, sizeof(*fib_entry));
fib_node_init(&fib_entry->fe_node,
FIB_NODE_TYPE_ENTRY);
fib_entry->fe_fib_index = fib_index;
/*
* the one time we need to update the const prefix is when
* the entry is first created
*/
fep = (fib_prefix_t*)&(fib_entry->fe_prefix);
*fep = *prefix;
if (FIB_PROTOCOL_MPLS == fib_entry->fe_prefix.fp_proto)
{
fep->fp_len = 21;
if (MPLS_NON_EOS == fep->fp_eos)
{
fep->fp_payload_proto = DPO_PROTO_MPLS;
}
ASSERT(DPO_PROTO_NONE != fib_entry->fe_prefix.fp_payload_proto);
}
dpo_reset(&fib_entry->fe_lb);
*fib_entry_index = fib_entry_get_index(fib_entry);
return (fib_entry);
}
static fib_entry_t*
fib_entry_post_flag_update_actions (fib_entry_t *fib_entry,
fib_entry_flag_t old_flags)
{
fib_node_index_t fei;
/*
* save the index so we can recover from pool reallocs
*/
fei = fib_entry_get_index(fib_entry);
/*
* handle changes to attached export for import entries
*/
int is_import = (FIB_ENTRY_FLAG_IMPORT & fib_entry_get_flags_i(fib_entry));
int was_import = (FIB_ENTRY_FLAG_IMPORT & old_flags);
if (!was_import && is_import)
{
/*
* transition from not exported to exported
*/
/*
* there is an assumption here that the entry resolves via only
* one interface and that it is the cross VRF interface.
*/
u32 sw_if_index = fib_path_list_get_resolving_interface(fib_entry->fe_parent);
fib_attached_export_import(fib_entry,
fib_table_get_index_for_sw_if_index(
fib_entry_get_proto(fib_entry),
sw_if_index));
}
else if (was_import && !is_import)
{
/*
* transition from exported to not exported
*/
fib_attached_export_purge(fib_entry);
}
/*
* else
* no change. nothing to do.
*/
/*
* reload the entry address post possible pool realloc
*/
fib_entry = fib_entry_get(fei);
/*
* handle changes to attached export for export entries
*/
int is_attached = (FIB_ENTRY_FLAG_ATTACHED & fib_entry_get_flags_i(fib_entry));
int was_attached = (FIB_ENTRY_FLAG_ATTACHED & old_flags);
if (!was_attached && is_attached)
{
/*
* transition to attached. time to export
*/
// FIXME
}
// else FIXME
return (fib_entry);
}
static fib_entry_t*
fib_entry_post_install_actions (fib_entry_t *fib_entry,
fib_source_t source,
fib_entry_flag_t old_flags)
{
fib_entry = fib_entry_post_flag_update_actions(fib_entry,
old_flags);
fib_entry_src_action_installed(fib_entry, source);
return (fib_entry);
}
fib_node_index_t
fib_entry_create (u32 fib_index,
const fib_prefix_t *prefix,
fib_source_t source,
fib_entry_flag_t flags,
const fib_route_path_t *paths)
{
fib_node_index_t fib_entry_index;
fib_entry_t *fib_entry;
ASSERT(0 < vec_len(paths));
fib_entry = fib_entry_alloc(fib_index, prefix, &fib_entry_index);
/*
* since this is a new entry create, we don't need to check for winning
* sources - there is only one.
*/
fib_entry = fib_entry_src_action_add(fib_entry, source, flags,
drop_dpo_get(
fib_proto_to_dpo(
fib_entry_get_proto(fib_entry))));
fib_entry_src_action_path_swap(fib_entry,
source,
flags,
paths);
/*
* handle possible realloc's by refetching the pointer
*/
fib_entry = fib_entry_get(fib_entry_index);
fib_entry_src_action_activate(fib_entry, source);
fib_entry = fib_entry_post_install_actions(fib_entry, source,
FIB_ENTRY_FLAG_NONE);
FIB_ENTRY_DBG(fib_entry, "create");
return (fib_entry_index);
}
fib_node_index_t
fib_entry_create_special (u32 fib_index,
const fib_prefix_t *prefix,
fib_source_t source,
fib_entry_flag_t flags,
const dpo_id_t *dpo)
{
fib_node_index_t fib_entry_index;
fib_entry_t *fib_entry;
/*
* create and initialize the new enty
*/
fib_entry = fib_entry_alloc(fib_index, prefix, &fib_entry_index);
/*
* create the path-list
*/
fib_entry = fib_entry_src_action_add(fib_entry, source, flags, dpo);
fib_entry_src_action_activate(fib_entry, source);
fib_entry = fib_entry_post_install_actions(fib_entry, source,
FIB_ENTRY_FLAG_NONE);
FIB_ENTRY_DBG(fib_entry, "create-special");
return (fib_entry_index);
}
static void
fib_entry_post_update_actions (fib_entry_t *fib_entry,
fib_source_t source,
fib_entry_flag_t old_flags)
{
/*
* backwalk to children to inform then of the change to forwarding.
*/
fib_node_back_walk_ctx_t bw_ctx = {
.fnbw_reason = FIB_NODE_BW_REASON_FLAG_EVALUATE,
};
fib_walk_sync(FIB_NODE_TYPE_ENTRY, fib_entry_get_index(fib_entry), &bw_ctx);
/*
* then inform any covered prefixes
*/
fib_entry_cover_update_notify(fib_entry);
fib_entry_post_install_actions(fib_entry, source, old_flags);
}
void
fib_entry_recalculate_forwarding (fib_node_index_t fib_entry_index)
{
fib_source_t best_source;
fib_entry_t *fib_entry;
fib_entry_src_t *bsrc;
fib_entry = fib_entry_get(fib_entry_index);
bsrc = fib_entry_get_best_src_i(fib_entry);
best_source = fib_entry_src_get_source(bsrc);
fib_entry_src_action_reactivate(fib_entry, best_source);
}
static void
fib_entry_source_change_w_flags (fib_entry_t *fib_entry,
fib_source_t old_source,
fib_entry_flag_t old_flags,
fib_source_t new_source)
{
switch (fib_source_cmp(new_source, old_source))
{
case FIB_SOURCE_CMP_BETTER:
/*
* we have a new winning source.
*/
fib_entry_src_action_deactivate(fib_entry, old_source);
fib_entry_src_action_activate(fib_entry, new_source);
break;
case FIB_SOURCE_CMP_WORSE:
/*
* the new source loses. Re-activate the winning sources
* in case it is an interposer and hence relied on the losing
* source's path-list.
*/
fib_entry_src_action_reactivate(fib_entry, old_source);
return;
case FIB_SOURCE_CMP_EQUAL:
/*
* the new source is one this entry already has.
* But the path-list was updated, which will contribute new forwarding,
* so install it.
*/
fib_entry_src_action_reactivate(fib_entry, new_source);
break;
}
fib_entry_post_update_actions(fib_entry, new_source, old_flags);
}
void
fib_entry_source_change (fib_entry_t *fib_entry,
fib_source_t old_source,
fib_source_t new_source)
{
fib_entry_flag_t old_flags;
old_flags = fib_entry_get_flags_for_source(
fib_entry_get_index(fib_entry), old_source);
return (fib_entry_source_change_w_flags(fib_entry, old_source,
old_flags, new_source));
}
void
fib_entry_special_add (fib_node_index_t fib_entry_index,
fib_source_t source,
fib_entry_flag_t flags,
const dpo_id_t *dpo)
{
fib_source_t best_source;
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
best_source = fib_entry_get_best_source(fib_entry_index);
fib_entry = fib_entry_src_action_add(fib_entry, source, flags, dpo);
fib_entry_source_change(fib_entry, best_source, source);
FIB_ENTRY_DBG(fib_entry, "special-add:%U", format_fib_source, source);
}
void
fib_entry_special_update (fib_node_index_t fib_entry_index,
fib_source_t source,
fib_entry_flag_t flags,
const dpo_id_t *dpo)
{
fib_source_t best_source;
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
best_source = fib_entry_get_best_source(fib_entry_index);
fib_entry = fib_entry_src_action_update(fib_entry, source, flags, dpo);
fib_entry_source_change(fib_entry, best_source, source);
FIB_ENTRY_DBG(fib_entry, "special-updated:%U", format_fib_source, source);
}
void
fib_entry_path_add (fib_node_index_t fib_entry_index,
fib_source_t source,
fib_entry_flag_t flags,
const fib_route_path_t *rpaths)
{
fib_source_t best_source;
fib_entry_t *fib_entry;
fib_entry_src_t *bsrc;
fib_entry = fib_entry_get(fib_entry_index);
ASSERT(NULL != fib_entry);
bsrc = fib_entry_get_best_src_i(fib_entry);
best_source = fib_entry_src_get_source(bsrc);
fib_entry = fib_entry_src_action_path_add(fib_entry, source, flags, rpaths);
fib_entry_source_change(fib_entry, best_source, source);
FIB_ENTRY_DBG(fib_entry, "path add:%U", format_fib_source, source);
}
static fib_entry_src_flag_t
fib_entry_src_burn_only_inherited (fib_entry_t *fib_entry)
{
fib_entry_src_t *src;
fib_source_t source;
int has_only_inherited_sources = 1;
FOR_EACH_SRC_ADDED(fib_entry, src, source,
({
if (!(src->fes_flags & FIB_ENTRY_SRC_FLAG_INHERITED))
{
has_only_inherited_sources = 0;
break;
}
}));
if (has_only_inherited_sources)
{
FOR_EACH_SRC_ADDED(fib_entry, src, source,
({
fib_entry_src_action_remove(fib_entry, source);
}));
return (FIB_ENTRY_SRC_FLAG_NONE);
}
else
{
return (FIB_ENTRY_SRC_FLAG_ADDED);
}
}
static fib_entry_src_flag_t
fib_entry_source_removed (fib_entry_t *fib_entry,
fib_entry_flag_t old_flags)
{
const fib_entry_src_t *bsrc;
fib_source_t best_source;
/*
* if all that is left are inherited sources, then burn them
*/
fib_entry_src_burn_only_inherited(fib_entry);
bsrc = fib_entry_get_best_src_i(fib_entry);
best_source = fib_entry_src_get_source(bsrc);
if (FIB_SOURCE_INVALID == best_source)
{
/*
* no more sources left. this entry is toast.
*/
fib_entry = fib_entry_post_flag_update_actions(fib_entry, old_flags);
fib_entry_src_action_uninstall(fib_entry);
return (FIB_ENTRY_SRC_FLAG_NONE);
}
else
{
fib_entry_src_action_activate(fib_entry, best_source);
}
fib_entry_post_update_actions(fib_entry, best_source, old_flags);
/*
* still have sources
*/
return (FIB_ENTRY_SRC_FLAG_ADDED);
}
/*
* fib_entry_path_remove
*
* remove a path from the entry.
* return the fib_entry's index if it is still present, INVALID otherwise.
*/
fib_entry_src_flag_t
fib_entry_path_remove (fib_node_index_t fib_entry_index,
fib_source_t source,
const fib_route_path_t *rpaths)
{
fib_entry_src_flag_t sflag;
fib_source_t best_source;
fib_entry_flag_t bflags;
fib_entry_t *fib_entry;
fib_entry_src_t *bsrc;
fib_entry = fib_entry_get(fib_entry_index);
ASSERT(NULL != fib_entry);
bsrc = fib_entry_get_best_src_i(fib_entry);
best_source = fib_entry_src_get_source(bsrc);
bflags = fib_entry_src_get_flags(bsrc);
sflag = fib_entry_src_action_path_remove(fib_entry, source, rpaths);
FIB_ENTRY_DBG(fib_entry, "path remove:%U", format_fib_source, source);
/*
* if the path list for the source passed is invalid,
* then we need to create a new one. else we are updating
* an existing.
*/
switch (fib_source_cmp(source, best_source))
{
case FIB_SOURCE_CMP_BETTER:
/*
* Que! removing a path from a source that is better than the
* one this entry is using.
*/
ASSERT(0);
break;
case FIB_SOURCE_CMP_WORSE:
/*
* the source is not the best. no need to update forwarding
*/
if (FIB_ENTRY_SRC_FLAG_ADDED & sflag)
{
/*
* the source being removed still has paths
*/
return (FIB_ENTRY_SRC_FLAG_ADDED);
}
else
{
/*
* that was the last path from this source, check if those
* that remain are non-inherited
*/
return (fib_entry_src_burn_only_inherited(fib_entry));
}
break;
case FIB_SOURCE_CMP_EQUAL:
/*
* removing a path from the path-list we were using.
*/
if (!(FIB_ENTRY_SRC_FLAG_ADDED & sflag))
{
/*
* the last path from the source was removed.
* fallback to lower source
*/
return (fib_entry_source_removed(fib_entry, bflags));
}
else
{
/*
* re-install the new forwarding information
*/
fib_entry_src_action_reactivate(fib_entry, source);
}
break;
}
fib_entry_post_update_actions(fib_entry, source, bflags);
/*
* still have sources
*/
return (FIB_ENTRY_SRC_FLAG_ADDED);
}
/*
* fib_entry_special_remove
*
* remove a special source from the entry.
* return the fib_entry's index if it is still present, INVALID otherwise.
*/
fib_entry_src_flag_t
fib_entry_special_remove (fib_node_index_t fib_entry_index,
fib_source_t source)
{
fib_entry_src_flag_t sflag;
fib_source_t best_source;
fib_entry_flag_t bflags;
fib_entry_t *fib_entry;
fib_entry_src_t *bsrc;
fib_entry = fib_entry_get(fib_entry_index);
ASSERT(NULL != fib_entry);
bsrc = fib_entry_get_best_src_i(fib_entry);
best_source = fib_entry_src_get_source(bsrc);
bflags = fib_entry_src_get_flags(bsrc);
FIB_ENTRY_DBG(fib_entry, "special remove:%U", format_fib_source, source);
sflag = fib_entry_src_action_remove_or_update_inherit(fib_entry, source);
/*
* if the path list for the source passed is invalid,
* then we need to create a new one. else we are updating
* an existing.
*/
switch (fib_source_cmp(source, best_source))
{
case FIB_SOURCE_CMP_BETTER:
/*
* Que! removing a path from a source that is better than the
* one this entry is using. This can only mean it is a source
* this prefix does not have.
*/
return (FIB_ENTRY_SRC_FLAG_ADDED);
case FIB_SOURCE_CMP_WORSE:
/*
* the source is not the best. no need to update forwarding
*/
if (FIB_ENTRY_SRC_FLAG_ADDED & sflag)
{
/*
* the source being removed still has paths
*/
return (FIB_ENTRY_SRC_FLAG_ADDED);
}
else
{
/*
* that was the last path from this source, check if those
* that remain are non-inherited
*/
if (FIB_ENTRY_SRC_FLAG_NONE == fib_entry_src_burn_only_inherited(fib_entry))
{
/*
* no more sources left. this entry is toast.
*/
fib_entry = fib_entry_post_flag_update_actions(fib_entry, bflags);
fib_entry_src_action_uninstall(fib_entry);
return (FIB_ENTRY_SRC_FLAG_NONE);
}
/*
* reactivate the best source so the interposer gets restacked
*/
fib_entry_src_action_reactivate(fib_entry, best_source);
return (FIB_ENTRY_SRC_FLAG_ADDED);
}
break;
case FIB_SOURCE_CMP_EQUAL:
if (!(FIB_ENTRY_SRC_FLAG_ADDED & sflag))
{
/*
* the source was removed. use the next best.
*/
return (fib_entry_source_removed(fib_entry, bflags));
}
else
{
/*
* re-install the new forwarding information
*/
fib_entry_src_action_reactivate(fib_entry, source);
}
break;
}
fib_entry_post_update_actions(fib_entry, source, bflags);
/*
* still have sources
*/
return (FIB_ENTRY_SRC_FLAG_ADDED);
}
/**
* fib_entry_inherit
*
* If the source on the cover is inheriting then push this source
* down to the covered.
*/
void
fib_entry_inherit (fib_node_index_t cover,
fib_node_index_t covered)
{
fib_entry_src_inherit(fib_entry_get(cover),
fib_entry_get(covered));
}
/**
* fib_entry_delete
*
* The source is withdrawing all the paths it provided
*/
fib_entry_src_flag_t
fib_entry_delete (fib_node_index_t fib_entry_index,
fib_source_t source)
{
return (fib_entry_special_remove(fib_entry_index, source));
}
/**
* fib_entry_update
*
* The source has provided a new set of paths that will replace the old.
*/
void
fib_entry_update (fib_node_index_t fib_entry_index,
fib_source_t source,
fib_entry_flag_t flags,
const fib_route_path_t *paths)
{
fib_source_t best_source;
fib_entry_flag_t bflags;
fib_entry_t *fib_entry;
fib_entry_src_t *bsrc;
fib_entry = fib_entry_get(fib_entry_index);
ASSERT(NULL != fib_entry);
bsrc = fib_entry_get_best_src_i(fib_entry);
best_source = fib_entry_src_get_source(bsrc);
bflags = fib_entry_get_flags_i(fib_entry);
fib_entry = fib_entry_src_action_path_swap(fib_entry,
source,
flags,
paths);
fib_entry_source_change_w_flags(fib_entry, best_source, bflags, source);
FIB_ENTRY_DBG(fib_entry, "update");
}
/*
* fib_entry_cover_changed
*
* this entry is tracking its cover and that cover has changed.
*/
void
fib_entry_cover_changed (fib_node_index_t fib_entry_index)
{
fib_entry_src_cover_res_t res = {
.install = !0,
.bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
};
CLIB_UNUSED(fib_source_t source);
fib_source_t best_source;
fib_entry_flag_t bflags;
fib_entry_t *fib_entry;
fib_entry_src_t *esrc;
u32 index;
bflags = FIB_ENTRY_FLAG_NONE;
best_source = FIB_SOURCE_FIRST;
fib_entry = fib_entry_get(fib_entry_index);
fib_attached_export_cover_change(fib_entry);
/*
* propagate the notification to each of the added sources
*/
index = 0;
FOR_EACH_SRC_ADDED(fib_entry, esrc, source,
({
if (0 == index)
{
/*
* only the best source gets to set the back walk flags
*/
res = fib_entry_src_action_cover_change(fib_entry, esrc);
bflags = fib_entry_src_get_flags(esrc);
best_source = fib_entry_src_get_source(esrc);
}
else
{
fib_entry_src_action_cover_change(fib_entry, esrc);
}
index++;
}));
if (res.install)
{
fib_entry_src_action_reactivate(fib_entry,
fib_entry_src_get_source(
fib_entry_get_best_src_i(fib_entry)));
fib_entry = fib_entry_post_install_actions(fib_entry,
best_source,
bflags);
}
else
{
fib_entry_src_action_uninstall(fib_entry);
}
if (FIB_NODE_BW_REASON_FLAG_NONE != res.bw_reason)
{
/*
* time for walkies fido.
*/
fib_node_back_walk_ctx_t bw_ctx = {
.fnbw_reason = res.bw_reason,
};
fib_walk_sync(FIB_NODE_TYPE_ENTRY, fib_entry_index, &bw_ctx);
}
FIB_ENTRY_DBG(fib_entry, "cover-changed");
}
/*
* fib_entry_cover_updated
*
* this entry is tracking its cover and that cover has been updated
* (i.e. its forwarding information has changed).
*/
void
fib_entry_cover_updated (fib_node_index_t fib_entry_index)
{
fib_entry_src_cover_res_t res = {
.install = !0,
.bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
};
CLIB_UNUSED(fib_source_t source);
fib_source_t best_source;
fib_entry_flag_t bflags;
fib_entry_t *fib_entry;
fib_entry_src_t *esrc;
u32 index;
bflags = FIB_ENTRY_FLAG_NONE;
best_source = FIB_SOURCE_FIRST;
fib_entry = fib_entry_get(fib_entry_index);
fib_attached_export_cover_update(fib_entry);
/*
* propagate the notification to each of the added sources
*/
index = 0;
FOR_EACH_SRC_ADDED(fib_entry, esrc, source,
({
if (0 == index)
{
/*
* only the best source gets to set the back walk flags
*/
res = fib_entry_src_action_cover_update(fib_entry, esrc);
bflags = fib_entry_src_get_flags(esrc);
best_source = fib_entry_src_get_source(esrc);
}
else
{
fib_entry_src_action_cover_update(fib_entry, esrc);
}
index++;
}));
if (res.install)
{
fib_entry_src_action_reactivate(fib_entry,
fib_entry_src_get_source(
fib_entry_get_best_src_i(fib_entry)));
fib_entry = fib_entry_post_install_actions(fib_entry,
best_source,
bflags);
}
else
{
fib_entry_src_action_uninstall(fib_entry);
}
if (FIB_NODE_BW_REASON_FLAG_NONE != res.bw_reason)
{
/*
* time for walkies fido.
*/
fib_node_back_walk_ctx_t bw_ctx = {
.fnbw_reason = res.bw_reason,
};
fib_walk_sync(FIB_NODE_TYPE_ENTRY, fib_entry_index, &bw_ctx);
}
FIB_ENTRY_DBG(fib_entry, "cover-updated");
}
int
fib_entry_recursive_loop_detect (fib_node_index_t entry_index,
fib_node_index_t **entry_indicies)
{
fib_entry_t *fib_entry;
int was_looped, is_looped;
fib_entry = fib_entry_get(entry_index);
if (FIB_NODE_INDEX_INVALID != fib_entry->fe_parent)
{
fib_node_index_t *entries = *entry_indicies;
vec_add1(entries, entry_index);
was_looped = fib_path_list_is_looped(fib_entry->fe_parent);
is_looped = fib_path_list_recursive_loop_detect(fib_entry->fe_parent,
&entries);
*entry_indicies = entries;
if (!!was_looped != !!is_looped)
{
/*
* re-evaluate all the entry's forwarding
* NOTE: this is an inplace modify
*/
fib_entry_delegate_type_t fdt;
fib_entry_delegate_t *fed;
FOR_EACH_DELEGATE_CHAIN(fib_entry, fdt, fed,
{
fib_entry_src_mk_lb(fib_entry,
fib_entry_get_best_src_i(fib_entry),
fib_entry_delegate_type_to_chain_type(fdt),
&fed->fd_dpo);
});
}
}
else
{
/*
* the entry is currently not linked to a path-list. this happens
* when it is this entry that is re-linking path-lists and has thus
* broken the loop
*/
is_looped = 0;
}
return (is_looped);
}
u32
fib_entry_get_resolving_interface (fib_node_index_t entry_index)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(entry_index);
return (fib_path_list_get_resolving_interface(fib_entry->fe_parent));
}
fib_source_t
fib_entry_get_best_source (fib_node_index_t entry_index)
{
fib_entry_t *fib_entry;
fib_entry_src_t *bsrc;
fib_entry = fib_entry_get(entry_index);
bsrc = fib_entry_get_best_src_i(fib_entry);
return (fib_entry_src_get_source(bsrc));
}
/**
* Return !0 is the entry represents a host prefix
*/
int
fib_entry_is_host (fib_node_index_t fib_entry_index)
{
return (fib_prefix_is_host(fib_entry_get_prefix(fib_entry_index)));
}
/**
* Return !0 is the entry is resolved, i.e. will return a valid forwarding
* chain
*/
int
fib_entry_is_resolved (fib_node_index_t fib_entry_index)
{
fib_entry_delegate_t *fed;
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
fed = fib_entry_delegate_find(fib_entry, FIB_ENTRY_DELEGATE_BFD);
if (NULL == fed)
{
/*
* no BFD tracking - consider it resolved.
*/
return (!0);
}
else
{
/*
* defer to the state of the BFD tracking
*/
return (FIB_BFD_STATE_UP == fed->fd_bfd_state);
}
}
void
fib_entry_set_flow_hash_config (fib_node_index_t fib_entry_index,
flow_hash_config_t hash_config)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
/*
* pass the hash-config on to the load-balance object where it is cached.
* we can ignore LBs in the delegate chains, since they will not be of the
* correct protocol type (i.e. they are not IP)
* There's no way, nor need, to change the hash config for MPLS.
*/
if (dpo_id_is_valid(&fib_entry->fe_lb))
{
load_balance_t *lb;
ASSERT(DPO_LOAD_BALANCE == fib_entry->fe_lb.dpoi_type);
lb = load_balance_get(fib_entry->fe_lb.dpoi_index);
/*
* atomic update for packets in flight
*/
lb->lb_hash_config = hash_config;
}
}
u32
fib_entry_get_stats_index (fib_node_index_t fib_entry_index)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
return (fib_entry->fe_lb.dpoi_index);
}
static int
fib_ip4_address_compare (const ip4_address_t * a1,
const ip4_address_t * a2)
{
/*
* IP addresses are unsigned 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 undefined, 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 (const ip6_address_t * a1,
const 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
fib_entry_cmp (fib_node_index_t fib_entry_index1,
fib_node_index_t fib_entry_index2)
{
fib_entry_t *fib_entry1, *fib_entry2;
int cmp = 0;
fib_entry1 = fib_entry_get(fib_entry_index1);
fib_entry2 = fib_entry_get(fib_entry_index2);
switch (fib_entry1->fe_prefix.fp_proto)
{
case FIB_PROTOCOL_IP4:
cmp = fib_ip4_address_compare(&fib_entry1->fe_prefix.fp_addr.ip4,
&fib_entry2->fe_prefix.fp_addr.ip4);
break;
case FIB_PROTOCOL_IP6:
cmp = fib_ip6_address_compare(&fib_entry1->fe_prefix.fp_addr.ip6,
&fib_entry2->fe_prefix.fp_addr.ip6);
break;
case FIB_PROTOCOL_MPLS:
cmp = (fib_entry1->fe_prefix.fp_label - fib_entry2->fe_prefix.fp_label);
if (0 == cmp)
{
cmp = (fib_entry1->fe_prefix.fp_eos - fib_entry2->fe_prefix.fp_eos);
}
break;
}
if (0 == cmp) {
cmp = (fib_entry1->fe_prefix.fp_len - fib_entry2->fe_prefix.fp_len);
}
return (cmp);
}
int
fib_entry_cmp_for_sort (void *i1, void *i2)
{
fib_node_index_t *fib_entry_index1 = i1, *fib_entry_index2 = i2;
return (fib_entry_cmp(*fib_entry_index1,
*fib_entry_index2));
}
void
fib_entry_lock (fib_node_index_t fib_entry_index)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
fib_node_lock(&fib_entry->fe_node);
}
void
fib_entry_unlock (fib_node_index_t fib_entry_index)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
fib_node_unlock(&fib_entry->fe_node);
}
void
fib_entry_module_init (void)
{
fib_node_register_type(FIB_NODE_TYPE_ENTRY, &fib_entry_vft);
fib_entry_logger = vlib_log_register_class("fib", "entry");
fib_entry_track_module_init();
}
fib_route_path_t *
fib_entry_encode (fib_node_index_t fib_entry_index)
{
fib_path_ext_list_t *ext_list;
fib_path_encode_ctx_t ctx = {
.rpaths = NULL,
};
fib_entry_t *fib_entry;
fib_entry_src_t *bsrc;
ext_list = NULL;
fib_entry = fib_entry_get(fib_entry_index);
bsrc = fib_entry_get_best_src_i(fib_entry);
if (bsrc)
{
ext_list = &bsrc->fes_path_exts;
}
if (FIB_NODE_INDEX_INVALID != fib_entry->fe_parent)
{
fib_path_list_walk_w_ext(fib_entry->fe_parent,
ext_list,
fib_path_encode,
&ctx);
}
return (ctx.rpaths);
}
const fib_prefix_t *
fib_entry_get_prefix (fib_node_index_t fib_entry_index)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
return (&fib_entry->fe_prefix);
}
u32
fib_entry_get_fib_index (fib_node_index_t fib_entry_index)
{
fib_entry_t *fib_entry;
fib_entry = fib_entry_get(fib_entry_index);
return (fib_entry->fe_fib_index);
}
u32
fib_entry_pool_size (void)
{
return (pool_elts(fib_entry_pool));
}
static clib_error_t *
show_fib_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(fib_entry_pool, fei))
{
vlib_cli_output (vm, "%d@%U",
fei,
format_fib_entry, fei,
FIB_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, fib_entry_pool,
({
vlib_cli_output (vm, "%d@%U",
fei,
format_fib_entry, fei,
FIB_ENTRY_FORMAT_BRIEF);
}));
}
return (NULL);
}
VLIB_CLI_COMMAND (show_fib_entry, static) = {
.path = "show fib entry",
.function = show_fib_entry_command,
.short_help = "show fib entry",
};