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gerrit.nordix.org / fdio / vpp / da78f957e46c686434149d332a477d7ea055d76a / . / src / vnet / fib / fib_path.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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/ip/format.h>
#include <vnet/ip/ip.h>
#include <vnet/dpo/drop_dpo.h>
#include <vnet/dpo/receive_dpo.h>
#include <vnet/dpo/load_balance_map.h>
#include <vnet/dpo/lookup_dpo.h>
#include <vnet/dpo/interface_dpo.h>
#include <vnet/dpo/mpls_disposition.h>
#include <vnet/adj/adj.h>
#include <vnet/adj/adj_mcast.h>
#include <vnet/fib/fib_path.h>
#include <vnet/fib/fib_node.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/fib_path_list.h>
#include <vnet/fib/fib_internal.h>
#include <vnet/fib/fib_urpf_list.h>
#include <vnet/fib/mpls_fib.h>
/**
* Enurmeration of path types
*/
typedef enum fib_path_type_t_ {
/**
* Marker. Add new types after this one.
*/
FIB_PATH_TYPE_FIRST = 0,
/**
* Attached-nexthop. An interface and a nexthop are known.
*/
FIB_PATH_TYPE_ATTACHED_NEXT_HOP = FIB_PATH_TYPE_FIRST,
/**
* attached. Only the interface is known.
*/
FIB_PATH_TYPE_ATTACHED,
/**
* recursive. Only the next-hop is known.
*/
FIB_PATH_TYPE_RECURSIVE,
/**
* special. nothing is known. so we drop.
*/
FIB_PATH_TYPE_SPECIAL,
/**
* exclusive. user provided adj.
*/
FIB_PATH_TYPE_EXCLUSIVE,
/**
* deag. Link to a lookup adj in the next table
*/
FIB_PATH_TYPE_DEAG,
/**
* interface receive.
*/
FIB_PATH_TYPE_INTF_RX,
/**
* receive. it's for-us.
*/
FIB_PATH_TYPE_RECEIVE,
/**
* Marker. Add new types before this one, then update it.
*/
FIB_PATH_TYPE_LAST = FIB_PATH_TYPE_RECEIVE,
} __attribute__ ((packed)) fib_path_type_t;
/**
* The maximum number of path_types
*/
#define FIB_PATH_TYPE_MAX (FIB_PATH_TYPE_LAST + 1)
#define FIB_PATH_TYPES { \
[FIB_PATH_TYPE_ATTACHED_NEXT_HOP] = "attached-nexthop", \
[FIB_PATH_TYPE_ATTACHED] = "attached", \
[FIB_PATH_TYPE_RECURSIVE] = "recursive", \
[FIB_PATH_TYPE_SPECIAL] = "special", \
[FIB_PATH_TYPE_EXCLUSIVE] = "exclusive", \
[FIB_PATH_TYPE_DEAG] = "deag", \
[FIB_PATH_TYPE_INTF_RX] = "intf-rx", \
[FIB_PATH_TYPE_RECEIVE] = "receive", \
}
#define FOR_EACH_FIB_PATH_TYPE(_item) \
for (_item = FIB_PATH_TYPE_FIRST; _item <= FIB_PATH_TYPE_LAST; _item++)
/**
* Enurmeration of path operational (i.e. derived) attributes
*/
typedef enum fib_path_oper_attribute_t_ {
/**
* Marker. Add new types after this one.
*/
FIB_PATH_OPER_ATTRIBUTE_FIRST = 0,
/**
* The path forms part of a recursive loop.
*/
FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP = FIB_PATH_OPER_ATTRIBUTE_FIRST,
/**
* The path is resolved
*/
FIB_PATH_OPER_ATTRIBUTE_RESOLVED,
/**
* The path is attached, despite what the next-hop may say.
*/
FIB_PATH_OPER_ATTRIBUTE_ATTACHED,
/**
* The path has become a permanent drop.
*/
FIB_PATH_OPER_ATTRIBUTE_DROP,
/**
* Marker. Add new types before this one, then update it.
*/
FIB_PATH_OPER_ATTRIBUTE_LAST = FIB_PATH_OPER_ATTRIBUTE_DROP,
} __attribute__ ((packed)) fib_path_oper_attribute_t;
/**
* The maximum number of path operational attributes
*/
#define FIB_PATH_OPER_ATTRIBUTE_MAX (FIB_PATH_OPER_ATTRIBUTE_LAST + 1)
#define FIB_PATH_OPER_ATTRIBUTES { \
[FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP] = "recursive-loop", \
[FIB_PATH_OPER_ATTRIBUTE_RESOLVED] = "resolved", \
[FIB_PATH_OPER_ATTRIBUTE_DROP] = "drop", \
}
#define FOR_EACH_FIB_PATH_OPER_ATTRIBUTE(_item) \
for (_item = FIB_PATH_OPER_ATTRIBUTE_FIRST; \
_item <= FIB_PATH_OPER_ATTRIBUTE_LAST; \
_item++)
/**
* Path flags from the attributes
*/
typedef enum fib_path_oper_flags_t_ {
FIB_PATH_OPER_FLAG_NONE = 0,
FIB_PATH_OPER_FLAG_RECURSIVE_LOOP = (1 << FIB_PATH_OPER_ATTRIBUTE_RECURSIVE_LOOP),
FIB_PATH_OPER_FLAG_DROP = (1 << FIB_PATH_OPER_ATTRIBUTE_DROP),
FIB_PATH_OPER_FLAG_RESOLVED = (1 << FIB_PATH_OPER_ATTRIBUTE_RESOLVED),
FIB_PATH_OPER_FLAG_ATTACHED = (1 << FIB_PATH_OPER_ATTRIBUTE_ATTACHED),
} __attribute__ ((packed)) fib_path_oper_flags_t;
/**
* A FIB path
*/
typedef struct fib_path_t_ {
/**
* A path is a node in the FIB graph.
*/
fib_node_t fp_node;
/**
* The index of the path-list to which this path belongs
*/
u32 fp_pl_index;
/**
* This marks the start of the memory area used to hash
* the path
*/
STRUCT_MARK(path_hash_start);
/**
* Configuration Flags
*/
fib_path_cfg_flags_t fp_cfg_flags;
/**
* The type of the path. This is the selector for the union
*/
fib_path_type_t fp_type;
/**
* The protocol of the next-hop, i.e. the address family of the
* next-hop's address. We can't derive this from the address itself
* since the address can be all zeros
*/
dpo_proto_t fp_nh_proto;
/**
* UCMP [unnormalised] weigth
*/
u8 fp_weight;
/**
* A path preference. 0 is the best.
* Only paths of the best preference, that are 'up', are considered
* for forwarding.
*/
u8 fp_preference;
/**
* per-type union of the data required to resolve the path
*/
union {
struct {
/**
* The next-hop
*/
ip46_address_t fp_nh;
/**
* The interface
*/
u32 fp_interface;
} attached_next_hop;
struct {
/**
* The interface
*/
u32 fp_interface;
} attached;
struct {
union
{
/**
* The next-hop
*/
ip46_address_t fp_ip;
struct {
/**
* The local label to resolve through.
*/
mpls_label_t fp_local_label;
/**
* The EOS bit of the resolving label
*/
mpls_eos_bit_t fp_eos;
};
} fp_nh;
/**
* The FIB table index in which to find the next-hop.
*/
fib_node_index_t fp_tbl_id;
} recursive;
struct {
/**
* The FIB index in which to perfom the next lookup
*/
fib_node_index_t fp_tbl_id;
/**
* The RPF-ID to tag the packets with
*/
fib_rpf_id_t fp_rpf_id;
} deag;
struct {
} special;
struct {
/**
* The user provided 'exclusive' DPO
*/
dpo_id_t fp_ex_dpo;
} exclusive;
struct {
/**
* The interface on which the local address is configured
*/
u32 fp_interface;
/**
* The next-hop
*/
ip46_address_t fp_addr;
} receive;
struct {
/**
* The interface on which the packets will be input.
*/
u32 fp_interface;
} intf_rx;
};
STRUCT_MARK(path_hash_end);
/**
* Memebers in this last section represent information that is
* dervied during resolution. It should not be copied to new paths
* nor compared.
*/
/**
* Operational Flags
*/
fib_path_oper_flags_t fp_oper_flags;
/**
* the resolving via fib. not part of the union, since it it not part
* of the path's hash.
*/
fib_node_index_t fp_via_fib;
/**
* The Data-path objects through which this path resolves for IP.
*/
dpo_id_t fp_dpo;
/**
* the index of this path in the parent's child list.
*/
u32 fp_sibling;
} fib_path_t;
/*
* Array of strings/names for the path types and attributes
*/
static const char *fib_path_type_names[] = FIB_PATH_TYPES;
static const char *fib_path_oper_attribute_names[] = FIB_PATH_OPER_ATTRIBUTES;
static const char *fib_path_cfg_attribute_names[] = FIB_PATH_CFG_ATTRIBUTES;
/*
* The memory pool from which we allocate all the paths
*/
static fib_path_t *fib_path_pool;
/*
* Debug macro
*/
#ifdef FIB_DEBUG
#define FIB_PATH_DBG(_p, _fmt, _args...) \
{ \
u8 *_tmp = NULL; \
_tmp = fib_path_format(fib_path_get_index(_p), _tmp); \
clib_warning("path:[%d:%s]:" _fmt, \
fib_path_get_index(_p), _tmp, \
##_args); \
vec_free(_tmp); \
}
#else
#define FIB_PATH_DBG(_p, _fmt, _args...)
#endif
static fib_path_t *
fib_path_get (fib_node_index_t index)
{
return (pool_elt_at_index(fib_path_pool, index));
}
static fib_node_index_t
fib_path_get_index (fib_path_t *path)
{
return (path - fib_path_pool);
}
static fib_node_t *
fib_path_get_node (fib_node_index_t index)
{
return ((fib_node_t*)fib_path_get(index));
}
static fib_path_t*
fib_path_from_fib_node (fib_node_t *node)
{
#if CLIB_DEBUG > 0
ASSERT(FIB_NODE_TYPE_PATH == node->fn_type);
#endif
return ((fib_path_t*)node);
}
u8 *
format_fib_path (u8 * s, va_list * args)
{
fib_path_t *path = va_arg (*args, fib_path_t *);
vnet_main_t * vnm = vnet_get_main();
fib_path_oper_attribute_t oattr;
fib_path_cfg_attribute_t cattr;
s = format (s, " index:%d ", fib_path_get_index(path));
s = format (s, "pl-index:%d ", path->fp_pl_index);
s = format (s, "%U ", format_dpo_proto, path->fp_nh_proto);
s = format (s, "weight=%d ", path->fp_weight);
s = format (s, "pref=%d ", path->fp_preference);
s = format (s, "%s: ", fib_path_type_names[path->fp_type]);
if (FIB_PATH_OPER_FLAG_NONE != path->fp_oper_flags) {
s = format(s, " oper-flags:");
FOR_EACH_FIB_PATH_OPER_ATTRIBUTE(oattr) {
if ((1<<oattr) & path->fp_oper_flags) {
s = format (s, "%s,", fib_path_oper_attribute_names[oattr]);
}
}
}
if (FIB_PATH_CFG_FLAG_NONE != path->fp_cfg_flags) {
s = format(s, " cfg-flags:");
FOR_EACH_FIB_PATH_CFG_ATTRIBUTE(cattr) {
if ((1<<cattr) & path->fp_cfg_flags) {
s = format (s, "%s,", fib_path_cfg_attribute_names[cattr]);
}
}
}
s = format(s, "\n ");
switch (path->fp_type)
{
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
s = format (s, "%U", format_ip46_address,
&path->attached_next_hop.fp_nh,
IP46_TYPE_ANY);
if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP)
{
s = format (s, " if_index:%d", path->attached_next_hop.fp_interface);
}
else
{
s = format (s, " %U",
format_vnet_sw_interface_name,
vnm,
vnet_get_sw_interface(
vnm,
path->attached_next_hop.fp_interface));
if (vnet_sw_interface_is_p2p(vnet_get_main(),
path->attached_next_hop.fp_interface))
{
s = format (s, " (p2p)");
}
}
if (!dpo_id_is_valid(&path->fp_dpo))
{
s = format(s, "\n unresolved");
}
else
{
s = format(s, "\n %U",
format_dpo_id,
&path->fp_dpo, 13);
}
break;
case FIB_PATH_TYPE_ATTACHED:
if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP)
{
s = format (s, " if_index:%d", path->attached_next_hop.fp_interface);
}
else
{
s = format (s, " %U",
format_vnet_sw_interface_name,
vnm,
vnet_get_sw_interface(
vnm,
path->attached.fp_interface));
}
break;
case FIB_PATH_TYPE_RECURSIVE:
if (DPO_PROTO_MPLS == path->fp_nh_proto)
{
s = format (s, "via %U %U",
format_mpls_unicast_label,
path->recursive.fp_nh.fp_local_label,
format_mpls_eos_bit,
path->recursive.fp_nh.fp_eos);
}
else
{
s = format (s, "via %U",
format_ip46_address,
&path->recursive.fp_nh.fp_ip,
IP46_TYPE_ANY);
}
s = format (s, " in fib:%d",
path->recursive.fp_tbl_id,
path->fp_via_fib);
s = format (s, " via-fib:%d", path->fp_via_fib);
s = format (s, " via-dpo:[%U:%d]",
format_dpo_type, path->fp_dpo.dpoi_type,
path->fp_dpo.dpoi_index);
break;
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_INTF_RX:
case FIB_PATH_TYPE_SPECIAL:
case FIB_PATH_TYPE_DEAG:
case FIB_PATH_TYPE_EXCLUSIVE:
if (dpo_id_is_valid(&path->fp_dpo))
{
s = format(s, "%U", format_dpo_id,
&path->fp_dpo, 2);
}
break;
}
return (s);
}
u8 *
fib_path_format (fib_node_index_t pi, u8 *s)
{
fib_path_t *path;
path = fib_path_get(pi);
ASSERT(NULL != path);
return (format (s, "%U", format_fib_path, path));
}
u8 *
fib_path_adj_format (fib_node_index_t pi,
u32 indent,
u8 *s)
{
fib_path_t *path;
path = fib_path_get(pi);
ASSERT(NULL != path);
if (!dpo_id_is_valid(&path->fp_dpo))
{
s = format(s, " unresolved");
}
else
{
s = format(s, "%U", format_dpo_id,
&path->fp_dpo, 2);
}
return (s);
}
/*
* fib_path_last_lock_gone
*
* We don't share paths, we share path lists, so the [un]lock functions
* are no-ops
*/
static void
fib_path_last_lock_gone (fib_node_t *node)
{
ASSERT(0);
}
static const adj_index_t
fib_path_attached_next_hop_get_adj (fib_path_t *path,
vnet_link_t link)
{
if (vnet_sw_interface_is_p2p(vnet_get_main(),
path->attached_next_hop.fp_interface))
{
/*
* if the interface is p2p then the adj for the specific
* neighbour on that link will never exist. on p2p links
* the subnet address (the attached route) links to the
* auto-adj (see below), we want that adj here too.
*/
return (adj_nbr_add_or_lock(dpo_proto_to_fib(path->fp_nh_proto),
link,
&zero_addr,
path->attached_next_hop.fp_interface));
}
else
{
return (adj_nbr_add_or_lock(dpo_proto_to_fib(path->fp_nh_proto),
link,
&path->attached_next_hop.fp_nh,
path->attached_next_hop.fp_interface));
}
}
static void
fib_path_attached_next_hop_set (fib_path_t *path)
{
/*
* resolve directly via the adjacnecy discribed by the
* interface and next-hop
*/
dpo_set(&path->fp_dpo,
DPO_ADJACENCY,
path->fp_nh_proto,
fib_path_attached_next_hop_get_adj(
path,
dpo_proto_to_link(path->fp_nh_proto)));
/*
* become a child of the adjacency so we receive updates
* when its rewrite changes
*/
path->fp_sibling = adj_child_add(path->fp_dpo.dpoi_index,
FIB_NODE_TYPE_PATH,
fib_path_get_index(path));
if (!vnet_sw_interface_is_admin_up(vnet_get_main(),
path->attached_next_hop.fp_interface) ||
!adj_is_up(path->fp_dpo.dpoi_index))
{
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
}
}
static const adj_index_t
fib_path_attached_get_adj (fib_path_t *path,
vnet_link_t link)
{
if (vnet_sw_interface_is_p2p(vnet_get_main(),
path->attached.fp_interface))
{
/*
* point-2-point interfaces do not require a glean, since
* there is nothing to ARP. Install a rewrite/nbr adj instead
*/
return (adj_nbr_add_or_lock(dpo_proto_to_fib(path->fp_nh_proto),
link,
&zero_addr,
path->attached.fp_interface));
}
else
{
return (adj_glean_add_or_lock(dpo_proto_to_fib(path->fp_nh_proto),
path->attached.fp_interface,
NULL));
}
}
/*
* create of update the paths recursive adj
*/
static void
fib_path_recursive_adj_update (fib_path_t *path,
fib_forward_chain_type_t fct,
dpo_id_t *dpo)
{
dpo_id_t via_dpo = DPO_INVALID;
/*
* get the DPO to resolve through from the via-entry
*/
fib_entry_contribute_forwarding(path->fp_via_fib,
fct,
&via_dpo);
/*
* hope for the best - clear if restrictions apply.
*/
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
/*
* Validate any recursion constraints and over-ride the via
* adj if not met
*/
if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RECURSIVE_LOOP)
{
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
dpo_copy(&via_dpo, drop_dpo_get(path->fp_nh_proto));
}
else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_HOST)
{
/*
* the via FIB must be a host route.
* note the via FIB just added will always be a host route
* since it is an RR source added host route. So what we need to
* check is whether the route has other sources. If it does then
* some other source has added it as a host route. If it doesn't
* then it was added only here and inherits forwarding from a cover.
* the cover is not a host route.
* The RR source is the lowest priority source, so we check if it
* is the best. if it is there are no other sources.
*/
if (fib_entry_get_best_source(path->fp_via_fib) >= FIB_SOURCE_RR)
{
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
dpo_copy(&via_dpo, drop_dpo_get(path->fp_nh_proto));
/*
* PIC edge trigger. let the load-balance maps know
*/
load_balance_map_path_state_change(fib_path_get_index(path));
}
}
else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED)
{
/*
* RR source entries inherit the flags from the cover, so
* we can check the via directly
*/
if (!(FIB_ENTRY_FLAG_ATTACHED & fib_entry_get_flags(path->fp_via_fib)))
{
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
dpo_copy(&via_dpo, drop_dpo_get(path->fp_nh_proto));
/*
* PIC edge trigger. let the load-balance maps know
*/
load_balance_map_path_state_change(fib_path_get_index(path));
}
}
/*
* check for over-riding factors on the FIB entry itself
*/
if (!fib_entry_is_resolved(path->fp_via_fib))
{
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
dpo_copy(&via_dpo, drop_dpo_get(path->fp_nh_proto));
/*
* PIC edge trigger. let the load-balance maps know
*/
load_balance_map_path_state_change(fib_path_get_index(path));
}
/*
* If this path is contributing a drop, then it's not resolved
*/
if (dpo_is_drop(&via_dpo) || load_balance_is_drop(&via_dpo))
{
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
}
/*
* update the path's contributed DPO
*/
dpo_copy(dpo, &via_dpo);
FIB_PATH_DBG(path, "recursive update:");
dpo_reset(&via_dpo);
}
/*
* fib_path_is_permanent_drop
*
* Return !0 if the path is configured to permanently drop,
* despite other attributes.
*/
static int
fib_path_is_permanent_drop (fib_path_t *path)
{
return ((path->fp_cfg_flags & FIB_PATH_CFG_FLAG_DROP) ||
(path->fp_oper_flags & FIB_PATH_OPER_FLAG_DROP));
}
/*
* fib_path_unresolve
*
* Remove our dependency on the resolution target
*/
static void
fib_path_unresolve (fib_path_t *path)
{
/*
* the forced drop path does not need unresolving
*/
if (fib_path_is_permanent_drop(path))
{
return;
}
switch (path->fp_type)
{
case FIB_PATH_TYPE_RECURSIVE:
if (FIB_NODE_INDEX_INVALID != path->fp_via_fib)
{
fib_prefix_t pfx;
fib_entry_get_prefix(path->fp_via_fib, &pfx);
fib_entry_child_remove(path->fp_via_fib,
path->fp_sibling);
fib_table_entry_special_remove(path->recursive.fp_tbl_id,
&pfx,
FIB_SOURCE_RR);
path->fp_via_fib = FIB_NODE_INDEX_INVALID;
}
break;
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
case FIB_PATH_TYPE_ATTACHED:
adj_child_remove(path->fp_dpo.dpoi_index,
path->fp_sibling);
adj_unlock(path->fp_dpo.dpoi_index);
break;
case FIB_PATH_TYPE_EXCLUSIVE:
dpo_reset(&path->exclusive.fp_ex_dpo);
break;
case FIB_PATH_TYPE_SPECIAL:
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_INTF_RX:
case FIB_PATH_TYPE_DEAG:
/*
* these hold only the path's DPO, which is reset below.
*/
break;
}
/*
* release the adj we were holding and pick up the
* drop just in case.
*/
dpo_reset(&path->fp_dpo);
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
return;
}
static fib_forward_chain_type_t
fib_path_to_chain_type (const fib_path_t *path)
{
if (DPO_PROTO_MPLS == path->fp_nh_proto)
{
if (FIB_PATH_TYPE_RECURSIVE == path->fp_type &&
MPLS_EOS == path->recursive.fp_nh.fp_eos)
{
return (FIB_FORW_CHAIN_TYPE_MPLS_EOS);
}
else
{
return (FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS);
}
}
else
{
return (fib_forw_chain_type_from_dpo_proto(path->fp_nh_proto));
}
}
/*
* fib_path_back_walk_notify
*
* A back walk has reach this path.
*/
static fib_node_back_walk_rc_t
fib_path_back_walk_notify (fib_node_t *node,
fib_node_back_walk_ctx_t *ctx)
{
fib_path_t *path;
path = fib_path_from_fib_node(node);
switch (path->fp_type)
{
case FIB_PATH_TYPE_RECURSIVE:
if (FIB_NODE_BW_REASON_FLAG_EVALUATE & ctx->fnbw_reason)
{
/*
* modify the recursive adjacency to use the new forwarding
* of the via-fib.
* this update is visible to packets in flight in the DP.
*/
fib_path_recursive_adj_update(
path,
fib_path_to_chain_type(path),
&path->fp_dpo);
}
if ((FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason) ||
(FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason))
{
/*
* ADJ updates (complete<->incomplete) do not need to propagate to
* recursive entries.
* The only reason its needed as far back as here, is that the adj
* and the incomplete adj are a different DPO type, so the LBs need
* to re-stack.
* If this walk was quashed in the fib_entry, then any non-fib_path
* children (like tunnels that collapse out the LB when they stack)
* would not see the update.
*/
return (FIB_NODE_BACK_WALK_CONTINUE);
}
break;
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
/*
FIXME comment
* ADJ_UPDATE backwalk pass silently through here and up to
* the path-list when the multipath adj collapse occurs.
* The reason we do this is that the assumtption is that VPP
* runs in an environment where the Control-Plane is remote
* and hence reacts slowly to link up down. In order to remove
* this down link from the ECMP set quickly, we back-walk.
* VPP also has dedicated CPUs, so we are not stealing resources
* from the CP to do so.
*/
if (FIB_NODE_BW_REASON_FLAG_INTERFACE_UP & ctx->fnbw_reason)
{
if (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED)
{
/*
* alreday resolved. no need to walk back again
*/
return (FIB_NODE_BACK_WALK_CONTINUE);
}
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
}
if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN & ctx->fnbw_reason)
{
if (!(path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED))
{
/*
* alreday unresolved. no need to walk back again
*/
return (FIB_NODE_BACK_WALK_CONTINUE);
}
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
}
if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE & ctx->fnbw_reason)
{
/*
* The interface this path resolves through has been deleted.
* This will leave the path in a permanent drop state. The route
* needs to be removed and readded (and hence the path-list deleted)
* before it can forward again.
*/
fib_path_unresolve(path);
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_DROP;
}
if (FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason)
{
/*
* restack the DPO to pick up the correct DPO sub-type
*/
uword if_is_up;
adj_index_t ai;
if_is_up = vnet_sw_interface_is_admin_up(
vnet_get_main(),
path->attached_next_hop.fp_interface);
ai = fib_path_attached_next_hop_get_adj(
path,
dpo_proto_to_link(path->fp_nh_proto));
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
if (if_is_up && adj_is_up(ai))
{
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
}
dpo_set(&path->fp_dpo, DPO_ADJACENCY, path->fp_nh_proto, ai);
adj_unlock(ai);
if (!if_is_up)
{
/*
* If the interface is not up there is no reason to walk
* back to children. if we did they would only evalute
* that this path is unresolved and hence it would
* not contribute the adjacency - so it would be wasted
* CPU time.
*/
return (FIB_NODE_BACK_WALK_CONTINUE);
}
}
if (FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason)
{
if (!(path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED))
{
/*
* alreday unresolved. no need to walk back again
*/
return (FIB_NODE_BACK_WALK_CONTINUE);
}
/*
* the adj has gone down. the path is no longer resolved.
*/
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
}
break;
case FIB_PATH_TYPE_ATTACHED:
/*
* FIXME; this could schedule a lower priority walk, since attached
* routes are not usually in ECMP configurations so the backwalk to
* the FIB entry does not need to be high priority
*/
if (FIB_NODE_BW_REASON_FLAG_INTERFACE_UP & ctx->fnbw_reason)
{
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
}
if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN & ctx->fnbw_reason)
{
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
}
if (FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE & ctx->fnbw_reason)
{
fib_path_unresolve(path);
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_DROP;
}
break;
case FIB_PATH_TYPE_INTF_RX:
ASSERT(0);
case FIB_PATH_TYPE_DEAG:
/*
* FIXME When VRF delete is allowed this will need a poke.
*/
case FIB_PATH_TYPE_SPECIAL:
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_EXCLUSIVE:
/*
* these path types have no parents. so to be
* walked from one is unexpected.
*/
ASSERT(0);
break;
}
/*
* propagate the backwalk further to the path-list
*/
fib_path_list_back_walk(path->fp_pl_index, ctx);
return (FIB_NODE_BACK_WALK_CONTINUE);
}
static void
fib_path_memory_show (void)
{
fib_show_memory_usage("Path",
pool_elts(fib_path_pool),
pool_len(fib_path_pool),
sizeof(fib_path_t));
}
/*
* The FIB path's graph node virtual function table
*/
static const fib_node_vft_t fib_path_vft = {
.fnv_get = fib_path_get_node,
.fnv_last_lock = fib_path_last_lock_gone,
.fnv_back_walk = fib_path_back_walk_notify,
.fnv_mem_show = fib_path_memory_show,
};
static fib_path_cfg_flags_t
fib_path_route_flags_to_cfg_flags (const fib_route_path_t *rpath)
{
fib_path_cfg_flags_t cfg_flags = FIB_PATH_CFG_FLAG_NONE;
if (rpath->frp_flags & FIB_ROUTE_PATH_RESOLVE_VIA_HOST)
cfg_flags |= FIB_PATH_CFG_FLAG_RESOLVE_HOST;
if (rpath->frp_flags & FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED)
cfg_flags |= FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED;
if (rpath->frp_flags & FIB_ROUTE_PATH_LOCAL)
cfg_flags |= FIB_PATH_CFG_FLAG_LOCAL;
if (rpath->frp_flags & FIB_ROUTE_PATH_ATTACHED)
cfg_flags |= FIB_PATH_CFG_FLAG_ATTACHED;
if (rpath->frp_flags & FIB_ROUTE_PATH_INTF_RX)
cfg_flags |= FIB_PATH_CFG_FLAG_INTF_RX;
if (rpath->frp_flags & FIB_ROUTE_PATH_RPF_ID)
cfg_flags |= FIB_PATH_CFG_FLAG_RPF_ID;
if (rpath->frp_flags & FIB_ROUTE_PATH_EXCLUSIVE)
cfg_flags |= FIB_PATH_CFG_FLAG_EXCLUSIVE;
if (rpath->frp_flags & FIB_ROUTE_PATH_DROP)
cfg_flags |= FIB_PATH_CFG_FLAG_DROP;
return (cfg_flags);
}
/*
* fib_path_create
*
* Create and initialise a new path object.
* return the index of the path.
*/
fib_node_index_t
fib_path_create (fib_node_index_t pl_index,
const fib_route_path_t *rpath)
{
fib_path_t *path;
pool_get(fib_path_pool, path);
memset(path, 0, sizeof(*path));
fib_node_init(&path->fp_node,
FIB_NODE_TYPE_PATH);
dpo_reset(&path->fp_dpo);
path->fp_pl_index = pl_index;
path->fp_nh_proto = rpath->frp_proto;
path->fp_via_fib = FIB_NODE_INDEX_INVALID;
path->fp_weight = rpath->frp_weight;
if (0 == path->fp_weight)
{
/*
* a weight of 0 is a meaningless value. We could either reject it, and thus force
* clients to always use 1, or we can accept it and fixup approrpiately.
*/
path->fp_weight = 1;
}
path->fp_preference = rpath->frp_preference;
path->fp_cfg_flags = fib_path_route_flags_to_cfg_flags(rpath);
/*
* deduce the path's tpye from the parementers and save what is needed.
*/
if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_LOCAL)
{
path->fp_type = FIB_PATH_TYPE_RECEIVE;
path->receive.fp_interface = rpath->frp_sw_if_index;
path->receive.fp_addr = rpath->frp_addr;
}
else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_INTF_RX)
{
path->fp_type = FIB_PATH_TYPE_INTF_RX;
path->intf_rx.fp_interface = rpath->frp_sw_if_index;
}
else if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RPF_ID)
{
path->fp_type = FIB_PATH_TYPE_DEAG;
path->deag.fp_tbl_id = rpath->frp_fib_index;
path->deag.fp_rpf_id = rpath->frp_rpf_id;
}
else if (~0 != rpath->frp_sw_if_index)
{
if (ip46_address_is_zero(&rpath->frp_addr))
{
path->fp_type = FIB_PATH_TYPE_ATTACHED;
path->attached.fp_interface = rpath->frp_sw_if_index;
}
else
{
path->fp_type = FIB_PATH_TYPE_ATTACHED_NEXT_HOP;
path->attached_next_hop.fp_interface = rpath->frp_sw_if_index;
path->attached_next_hop.fp_nh = rpath->frp_addr;
}
}
else
{
if (ip46_address_is_zero(&rpath->frp_addr))
{
if (~0 == rpath->frp_fib_index)
{
path->fp_type = FIB_PATH_TYPE_SPECIAL;
}
else
{
path->fp_type = FIB_PATH_TYPE_DEAG;
path->deag.fp_tbl_id = rpath->frp_fib_index;
}
}
else
{
path->fp_type = FIB_PATH_TYPE_RECURSIVE;
if (DPO_PROTO_MPLS == path->fp_nh_proto)
{
path->recursive.fp_nh.fp_local_label = rpath->frp_local_label;
path->recursive.fp_nh.fp_eos = rpath->frp_eos;
}
else
{
path->recursive.fp_nh.fp_ip = rpath->frp_addr;
}
path->recursive.fp_tbl_id = rpath->frp_fib_index;
}
}
FIB_PATH_DBG(path, "create");
return (fib_path_get_index(path));
}
/*
* fib_path_create_special
*
* Create and initialise a new path object.
* return the index of the path.
*/
fib_node_index_t
fib_path_create_special (fib_node_index_t pl_index,
dpo_proto_t nh_proto,
fib_path_cfg_flags_t flags,
const dpo_id_t *dpo)
{
fib_path_t *path;
pool_get(fib_path_pool, path);
memset(path, 0, sizeof(*path));
fib_node_init(&path->fp_node,
FIB_NODE_TYPE_PATH);
dpo_reset(&path->fp_dpo);
path->fp_pl_index = pl_index;
path->fp_weight = 1;
path->fp_preference = 0;
path->fp_nh_proto = nh_proto;
path->fp_via_fib = FIB_NODE_INDEX_INVALID;
path->fp_cfg_flags = flags;
if (FIB_PATH_CFG_FLAG_DROP & flags)
{
path->fp_type = FIB_PATH_TYPE_SPECIAL;
}
else if (FIB_PATH_CFG_FLAG_LOCAL & flags)
{
path->fp_type = FIB_PATH_TYPE_RECEIVE;
path->attached.fp_interface = FIB_NODE_INDEX_INVALID;
}
else
{
path->fp_type = FIB_PATH_TYPE_EXCLUSIVE;
ASSERT(NULL != dpo);
dpo_copy(&path->exclusive.fp_ex_dpo, dpo);
}
return (fib_path_get_index(path));
}
/*
* fib_path_copy
*
* Copy a path. return index of new path.
*/
fib_node_index_t
fib_path_copy (fib_node_index_t path_index,
fib_node_index_t path_list_index)
{
fib_path_t *path, *orig_path;
pool_get(fib_path_pool, path);
orig_path = fib_path_get(path_index);
ASSERT(NULL != orig_path);
memcpy(path, orig_path, sizeof(*path));
FIB_PATH_DBG(path, "create-copy:%d", path_index);
/*
* reset the dynamic section
*/
fib_node_init(&path->fp_node, FIB_NODE_TYPE_PATH);
path->fp_oper_flags = FIB_PATH_OPER_FLAG_NONE;
path->fp_pl_index = path_list_index;
path->fp_via_fib = FIB_NODE_INDEX_INVALID;
memset(&path->fp_dpo, 0, sizeof(path->fp_dpo));
dpo_reset(&path->fp_dpo);
return (fib_path_get_index(path));
}
/*
* fib_path_destroy
*
* destroy a path that is no longer required
*/
void
fib_path_destroy (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
ASSERT(NULL != path);
FIB_PATH_DBG(path, "destroy");
fib_path_unresolve(path);
fib_node_deinit(&path->fp_node);
pool_put(fib_path_pool, path);
}
/*
* fib_path_destroy
*
* destroy a path that is no longer required
*/
uword
fib_path_hash (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
return (hash_memory(STRUCT_MARK_PTR(path, path_hash_start),
(STRUCT_OFFSET_OF(fib_path_t, path_hash_end) -
STRUCT_OFFSET_OF(fib_path_t, path_hash_start)),
0));
}
/*
* fib_path_cmp_i
*
* Compare two paths for equivalence.
*/
static int
fib_path_cmp_i (const fib_path_t *path1,
const fib_path_t *path2)
{
int res;
res = 1;
/*
* paths of different types and protocol are not equal.
* different weights and/or preference only are the same path.
*/
if (path1->fp_type != path2->fp_type)
{
res = (path1->fp_type - path2->fp_type);
}
else if (path1->fp_nh_proto != path2->fp_nh_proto)
{
res = (path1->fp_nh_proto - path2->fp_nh_proto);
}
else
{
/*
* both paths are of the same type.
* consider each type and its attributes in turn.
*/
switch (path1->fp_type)
{
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
res = ip46_address_cmp(&path1->attached_next_hop.fp_nh,
&path2->attached_next_hop.fp_nh);
if (0 == res) {
res = (path1->attached_next_hop.fp_interface -
path2->attached_next_hop.fp_interface);
}
break;
case FIB_PATH_TYPE_ATTACHED:
res = (path1->attached.fp_interface -
path2->attached.fp_interface);
break;
case FIB_PATH_TYPE_RECURSIVE:
res = ip46_address_cmp(&path1->recursive.fp_nh,
&path2->recursive.fp_nh);
if (0 == res)
{
res = (path1->recursive.fp_tbl_id - path2->recursive.fp_tbl_id);
}
break;
case FIB_PATH_TYPE_DEAG:
res = (path1->deag.fp_tbl_id - path2->deag.fp_tbl_id);
if (0 == res)
{
res = (path1->deag.fp_rpf_id - path2->deag.fp_rpf_id);
}
break;
case FIB_PATH_TYPE_INTF_RX:
res = (path1->intf_rx.fp_interface - path2->intf_rx.fp_interface);
break;
case FIB_PATH_TYPE_SPECIAL:
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_EXCLUSIVE:
res = 0;
break;
}
}
return (res);
}
/*
* fib_path_cmp_for_sort
*
* Compare two paths for equivalence. Used during path sorting.
* As usual 0 means equal.
*/
int
fib_path_cmp_for_sort (void * v1,
void * v2)
{
fib_node_index_t *pi1 = v1, *pi2 = v2;
fib_path_t *path1, *path2;
path1 = fib_path_get(*pi1);
path2 = fib_path_get(*pi2);
/*
* when sorting paths we want the highest preference paths
* first, so that the choices set built is in prefernce order
*/
if (path1->fp_preference != path2->fp_preference)
{
return (path1->fp_preference - path2->fp_preference);
}
return (fib_path_cmp_i(path1, path2));
}
/*
* fib_path_cmp
*
* Compare two paths for equivalence.
*/
int
fib_path_cmp (fib_node_index_t pi1,
fib_node_index_t pi2)
{
fib_path_t *path1, *path2;
path1 = fib_path_get(pi1);
path2 = fib_path_get(pi2);
return (fib_path_cmp_i(path1, path2));
}
int
fib_path_cmp_w_route_path (fib_node_index_t path_index,
const fib_route_path_t *rpath)
{
fib_path_t *path;
int res;
path = fib_path_get(path_index);
res = 1;
if (path->fp_weight != rpath->frp_weight)
{
res = (path->fp_weight - rpath->frp_weight);
}
else
{
/*
* both paths are of the same type.
* consider each type and its attributes in turn.
*/
switch (path->fp_type)
{
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
res = ip46_address_cmp(&path->attached_next_hop.fp_nh,
&rpath->frp_addr);
if (0 == res)
{
res = (path->attached_next_hop.fp_interface -
rpath->frp_sw_if_index);
}
break;
case FIB_PATH_TYPE_ATTACHED:
res = (path->attached.fp_interface - rpath->frp_sw_if_index);
break;
case FIB_PATH_TYPE_RECURSIVE:
if (DPO_PROTO_MPLS == path->fp_nh_proto)
{
res = path->recursive.fp_nh.fp_local_label - rpath->frp_local_label;
if (res == 0)
{
res = path->recursive.fp_nh.fp_eos - rpath->frp_eos;
}
}
else
{
res = ip46_address_cmp(&path->recursive.fp_nh.fp_ip,
&rpath->frp_addr);
}
if (0 == res)
{
res = (path->recursive.fp_tbl_id - rpath->frp_fib_index);
}
break;
case FIB_PATH_TYPE_INTF_RX:
res = (path->intf_rx.fp_interface - rpath->frp_sw_if_index);
break;
case FIB_PATH_TYPE_DEAG:
res = (path->deag.fp_tbl_id - rpath->frp_fib_index);
if (0 == res)
{
res = (path->deag.fp_rpf_id - rpath->frp_rpf_id);
}
break;
case FIB_PATH_TYPE_SPECIAL:
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_EXCLUSIVE:
res = 0;
break;
}
}
return (res);
}
/*
* fib_path_recursive_loop_detect
*
* A forward walk of the FIB object graph to detect for a cycle/loop. This
* walk is initiated when an entry is linking to a new path list or from an old.
* The entry vector passed contains all the FIB entrys that are children of this
* path (it is all the entries encountered on the walk so far). If this vector
* contains the entry this path resolve via, then a loop is about to form.
* The loop must be allowed to form, since we need the dependencies in place
* so that we can track when the loop breaks.
* However, we MUST not produce a loop in the forwarding graph (else packets
* would loop around the switch path until the loop breaks), so we mark recursive
* paths as looped so that they do not contribute forwarding information.
* By marking the path as looped, an etry such as;
* X/Y
* via a.a.a.a (looped)
* via b.b.b.b (not looped)
* can still forward using the info provided by b.b.b.b only
*/
int
fib_path_recursive_loop_detect (fib_node_index_t path_index,
fib_node_index_t **entry_indicies)
{
fib_path_t *path;
path = fib_path_get(path_index);
/*
* the forced drop path is never looped, cos it is never resolved.
*/
if (fib_path_is_permanent_drop(path))
{
return (0);
}
switch (path->fp_type)
{
case FIB_PATH_TYPE_RECURSIVE:
{
fib_node_index_t *entry_index, *entries;
int looped = 0;
entries = *entry_indicies;
vec_foreach(entry_index, entries) {
if (*entry_index == path->fp_via_fib)
{
/*
* the entry that is about to link to this path-list (or
* one of this path-list's children) is the same entry that
* this recursive path resolves through. this is a cycle.
* abort the walk.
*/
looped = 1;
break;
}
}
if (looped)
{
FIB_PATH_DBG(path, "recursive loop formed");
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RECURSIVE_LOOP;
dpo_copy(&path->fp_dpo, drop_dpo_get(path->fp_nh_proto));
}
else
{
/*
* no loop here yet. keep forward walking the graph.
*/
if (fib_entry_recursive_loop_detect(path->fp_via_fib, entry_indicies))
{
FIB_PATH_DBG(path, "recursive loop formed");
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RECURSIVE_LOOP;
}
else
{
FIB_PATH_DBG(path, "recursive loop cleared");
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RECURSIVE_LOOP;
}
}
break;
}
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
case FIB_PATH_TYPE_ATTACHED:
case FIB_PATH_TYPE_SPECIAL:
case FIB_PATH_TYPE_DEAG:
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_INTF_RX:
case FIB_PATH_TYPE_EXCLUSIVE:
/*
* these path types cannot be part of a loop, since they are the leaves
* of the graph.
*/
break;
}
return (fib_path_is_looped(path_index));
}
int
fib_path_resolve (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
/*
* hope for the best.
*/
path->fp_oper_flags |= FIB_PATH_OPER_FLAG_RESOLVED;
/*
* the forced drop path resolves via the drop adj
*/
if (fib_path_is_permanent_drop(path))
{
dpo_copy(&path->fp_dpo, drop_dpo_get(path->fp_nh_proto));
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
return (fib_path_is_resolved(path_index));
}
switch (path->fp_type)
{
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
fib_path_attached_next_hop_set(path);
break;
case FIB_PATH_TYPE_ATTACHED:
/*
* path->attached.fp_interface
*/
if (!vnet_sw_interface_is_admin_up(vnet_get_main(),
path->attached.fp_interface))
{
path->fp_oper_flags &= ~FIB_PATH_OPER_FLAG_RESOLVED;
}
dpo_set(&path->fp_dpo,
DPO_ADJACENCY,
path->fp_nh_proto,
fib_path_attached_get_adj(path,
dpo_proto_to_link(path->fp_nh_proto)));
/*
* become a child of the adjacency so we receive updates
* when the interface state changes
*/
path->fp_sibling = adj_child_add(path->fp_dpo.dpoi_index,
FIB_NODE_TYPE_PATH,
fib_path_get_index(path));
break;
case FIB_PATH_TYPE_RECURSIVE:
{
/*
* Create a RR source entry in the table for the address
* that this path recurses through.
* This resolve action is recursive, hence we may create
* more paths in the process. more creates mean maybe realloc
* of this path.
*/
fib_node_index_t fei;
fib_prefix_t pfx;
ASSERT(FIB_NODE_INDEX_INVALID == path->fp_via_fib);
if (DPO_PROTO_MPLS == path->fp_nh_proto)
{
fib_prefix_from_mpls_label(path->recursive.fp_nh.fp_local_label,
path->recursive.fp_nh.fp_eos,
&pfx);
}
else
{
fib_prefix_from_ip46_addr(&path->recursive.fp_nh.fp_ip, &pfx);
}
fei = fib_table_entry_special_add(path->recursive.fp_tbl_id,
&pfx,
FIB_SOURCE_RR,
FIB_ENTRY_FLAG_NONE);
path = fib_path_get(path_index);
path->fp_via_fib = fei;
/*
* become a dependent child of the entry so the path is
* informed when the forwarding for the entry changes.
*/
path->fp_sibling = fib_entry_child_add(path->fp_via_fib,
FIB_NODE_TYPE_PATH,
fib_path_get_index(path));
/*
* create and configure the IP DPO
*/
fib_path_recursive_adj_update(
path,
fib_path_to_chain_type(path),
&path->fp_dpo);
break;
}
case FIB_PATH_TYPE_SPECIAL:
/*
* Resolve via the drop
*/
dpo_copy(&path->fp_dpo, drop_dpo_get(path->fp_nh_proto));
break;
case FIB_PATH_TYPE_DEAG:
{
/*
* Resolve via a lookup DPO.
* FIXME. control plane should add routes with a table ID
*/
lookup_cast_t cast;
cast = (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RPF_ID ?
LOOKUP_MULTICAST :
LOOKUP_UNICAST);
lookup_dpo_add_or_lock_w_fib_index(path->deag.fp_tbl_id,
path->fp_nh_proto,
cast,
LOOKUP_INPUT_DST_ADDR,
LOOKUP_TABLE_FROM_CONFIG,
&path->fp_dpo);
break;
}
case FIB_PATH_TYPE_RECEIVE:
/*
* Resolve via a receive DPO.
*/
receive_dpo_add_or_lock(path->fp_nh_proto,
path->receive.fp_interface,
&path->receive.fp_addr,
&path->fp_dpo);
break;
case FIB_PATH_TYPE_INTF_RX: {
/*
* Resolve via a receive DPO.
*/
interface_dpo_add_or_lock(path->fp_nh_proto,
path->intf_rx.fp_interface,
&path->fp_dpo);
break;
}
case FIB_PATH_TYPE_EXCLUSIVE:
/*
* Resolve via the user provided DPO
*/
dpo_copy(&path->fp_dpo, &path->exclusive.fp_ex_dpo);
break;
}
return (fib_path_is_resolved(path_index));
}
u32
fib_path_get_resolving_interface (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
switch (path->fp_type)
{
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
return (path->attached_next_hop.fp_interface);
case FIB_PATH_TYPE_ATTACHED:
return (path->attached.fp_interface);
case FIB_PATH_TYPE_RECEIVE:
return (path->receive.fp_interface);
case FIB_PATH_TYPE_RECURSIVE:
if (fib_path_is_resolved(path_index))
{
return (fib_entry_get_resolving_interface(path->fp_via_fib));
}
break;
case FIB_PATH_TYPE_INTF_RX:
case FIB_PATH_TYPE_SPECIAL:
case FIB_PATH_TYPE_DEAG:
case FIB_PATH_TYPE_EXCLUSIVE:
break;
}
return (~0);
}
adj_index_t
fib_path_get_adj (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
ASSERT(dpo_is_adj(&path->fp_dpo));
if (dpo_is_adj(&path->fp_dpo))
{
return (path->fp_dpo.dpoi_index);
}
return (ADJ_INDEX_INVALID);
}
u16
fib_path_get_weight (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
ASSERT(path);
return (path->fp_weight);
}
u16
fib_path_get_preference (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
ASSERT(path);
return (path->fp_preference);
}
/**
* @brief Contribute the path's adjacency to the list passed.
* By calling this function over all paths, recursively, a child
* can construct its full set of forwarding adjacencies, and hence its
* uRPF list.
*/
void
fib_path_contribute_urpf (fib_node_index_t path_index,
index_t urpf)
{
fib_path_t *path;
path = fib_path_get(path_index);
/*
* resolved and unresolved paths contribute to the RPF list.
*/
switch (path->fp_type)
{
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
fib_urpf_list_append(urpf, path->attached_next_hop.fp_interface);
break;
case FIB_PATH_TYPE_ATTACHED:
fib_urpf_list_append(urpf, path->attached.fp_interface);
break;
case FIB_PATH_TYPE_RECURSIVE:
if (FIB_NODE_INDEX_INVALID != path->fp_via_fib &&
!fib_path_is_looped(path_index))
{
/*
* there's unresolved due to constraints, and there's unresolved
* due to ain't got no via. can't do nowt w'out via.
*/
fib_entry_contribute_urpf(path->fp_via_fib, urpf);
}
break;
case FIB_PATH_TYPE_EXCLUSIVE:
case FIB_PATH_TYPE_SPECIAL:
/*
* these path types may link to an adj, if that's what
* the clinet gave
*/
if (dpo_is_adj(&path->fp_dpo))
{
ip_adjacency_t *adj;
adj = adj_get(path->fp_dpo.dpoi_index);
fib_urpf_list_append(urpf, adj->rewrite_header.sw_if_index);
}
break;
case FIB_PATH_TYPE_DEAG:
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_INTF_RX:
/*
* these path types don't link to an adj
*/
break;
}
}
void
fib_path_stack_mpls_disp (fib_node_index_t path_index,
dpo_proto_t payload_proto,
dpo_id_t *dpo)
{
fib_path_t *path;
path = fib_path_get(path_index);
ASSERT(path);
switch (path->fp_type)
{
case FIB_PATH_TYPE_DEAG:
{
dpo_id_t tmp = DPO_INVALID;
dpo_copy(&tmp, dpo);
dpo_set(dpo,
DPO_MPLS_DISPOSITION,
payload_proto,
mpls_disp_dpo_create(payload_proto,
path->deag.fp_rpf_id,
&tmp));
dpo_reset(&tmp);
break;
}
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_ATTACHED:
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
case FIB_PATH_TYPE_RECURSIVE:
case FIB_PATH_TYPE_INTF_RX:
case FIB_PATH_TYPE_EXCLUSIVE:
case FIB_PATH_TYPE_SPECIAL:
break;
}
}
void
fib_path_contribute_forwarding (fib_node_index_t path_index,
fib_forward_chain_type_t fct,
dpo_id_t *dpo)
{
fib_path_t *path;
path = fib_path_get(path_index);
ASSERT(path);
ASSERT(FIB_FORW_CHAIN_TYPE_MPLS_EOS != fct);
FIB_PATH_DBG(path, "contribute");
/*
* The DPO stored in the path was created when the path was resolved.
* This then represents the path's 'native' protocol; IP.
* For all others will need to go find something else.
*/
if (fib_path_to_chain_type(path) == fct)
{
dpo_copy(dpo, &path->fp_dpo);
}
else
{
switch (path->fp_type)
{
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
switch (fct)
{
case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
case FIB_FORW_CHAIN_TYPE_ETHERNET:
case FIB_FORW_CHAIN_TYPE_NSH:
{
adj_index_t ai;
/*
* get a appropriate link type adj.
*/
ai = fib_path_attached_next_hop_get_adj(
path,
fib_forw_chain_type_to_link_type(fct));
dpo_set(dpo, DPO_ADJACENCY,
fib_forw_chain_type_to_dpo_proto(fct), ai);
adj_unlock(ai);
break;
}
case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
break;
}
break;
case FIB_PATH_TYPE_RECURSIVE:
switch (fct)
{
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_MCAST_IP4:
case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
fib_path_recursive_adj_update(path, fct, dpo);
break;
case FIB_FORW_CHAIN_TYPE_ETHERNET:
case FIB_FORW_CHAIN_TYPE_NSH:
ASSERT(0);
break;
}
break;
case FIB_PATH_TYPE_DEAG:
switch (fct)
{
case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
lookup_dpo_add_or_lock_w_table_id(MPLS_FIB_DEFAULT_TABLE_ID,
DPO_PROTO_MPLS,
LOOKUP_UNICAST,
LOOKUP_INPUT_DST_ADDR,
LOOKUP_TABLE_FROM_CONFIG,
dpo);
break;
case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
dpo_copy(dpo, &path->fp_dpo);
break;
case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
case FIB_FORW_CHAIN_TYPE_ETHERNET:
case FIB_FORW_CHAIN_TYPE_NSH:
ASSERT(0);
break;
}
break;
case FIB_PATH_TYPE_EXCLUSIVE:
dpo_copy(dpo, &path->exclusive.fp_ex_dpo);
break;
case FIB_PATH_TYPE_ATTACHED:
switch (fct)
{
case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
case FIB_FORW_CHAIN_TYPE_ETHERNET:
case FIB_FORW_CHAIN_TYPE_NSH:
{
adj_index_t ai;
/*
* get a appropriate link type adj.
*/
ai = fib_path_attached_get_adj(
path,
fib_forw_chain_type_to_link_type(fct));
dpo_set(dpo, DPO_ADJACENCY,
fib_forw_chain_type_to_dpo_proto(fct), ai);
adj_unlock(ai);
break;
}
case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
{
adj_index_t ai;
/*
* Create the adj needed for sending IP multicast traffic
*/
ai = adj_mcast_add_or_lock(dpo_proto_to_fib(path->fp_nh_proto),
fib_forw_chain_type_to_link_type(fct),
path->attached.fp_interface);
dpo_set(dpo, DPO_ADJACENCY,
fib_forw_chain_type_to_dpo_proto(fct),
ai);
adj_unlock(ai);
}
break;
}
break;
case FIB_PATH_TYPE_INTF_RX:
/*
* Create the adj needed for sending IP multicast traffic
*/
interface_dpo_add_or_lock(fib_forw_chain_type_to_dpo_proto(fct),
path->attached.fp_interface,
dpo);
break;
case FIB_PATH_TYPE_RECEIVE:
case FIB_PATH_TYPE_SPECIAL:
dpo_copy(dpo, &path->fp_dpo);
break;
}
}
}
load_balance_path_t *
fib_path_append_nh_for_multipath_hash (fib_node_index_t path_index,
fib_forward_chain_type_t fct,
load_balance_path_t *hash_key)
{
load_balance_path_t *mnh;
fib_path_t *path;
path = fib_path_get(path_index);
ASSERT(path);
if (fib_path_is_resolved(path_index))
{
vec_add2(hash_key, mnh, 1);
mnh->path_weight = path->fp_weight;
mnh->path_index = path_index;
fib_path_contribute_forwarding(path_index, fct, &mnh->path_dpo);
}
return (hash_key);
}
int
fib_path_is_recursive_constrained (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
return ((FIB_PATH_TYPE_RECURSIVE == path->fp_type) &&
((path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED) ||
(path->fp_cfg_flags & FIB_PATH_CFG_FLAG_RESOLVE_HOST)));
}
int
fib_path_is_exclusive (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
return (FIB_PATH_TYPE_EXCLUSIVE == path->fp_type);
}
int
fib_path_is_deag (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
return (FIB_PATH_TYPE_DEAG == path->fp_type);
}
int
fib_path_is_resolved (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
return (dpo_id_is_valid(&path->fp_dpo) &&
(path->fp_oper_flags & FIB_PATH_OPER_FLAG_RESOLVED) &&
!fib_path_is_looped(path_index) &&
!fib_path_is_permanent_drop(path));
}
int
fib_path_is_looped (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
return (path->fp_oper_flags & FIB_PATH_OPER_FLAG_RECURSIVE_LOOP);
}
fib_path_list_walk_rc_t
fib_path_encode (fib_node_index_t path_list_index,
fib_node_index_t path_index,
void *ctx)
{
fib_route_path_encode_t **api_rpaths = ctx;
fib_route_path_encode_t *api_rpath;
fib_path_t *path;
path = fib_path_get(path_index);
if (!path)
return (FIB_PATH_LIST_WALK_CONTINUE);
vec_add2(*api_rpaths, api_rpath, 1);
api_rpath->rpath.frp_weight = path->fp_weight;
api_rpath->rpath.frp_preference = path->fp_preference;
api_rpath->rpath.frp_proto = path->fp_nh_proto;
api_rpath->rpath.frp_sw_if_index = ~0;
api_rpath->dpo = path->exclusive.fp_ex_dpo;
switch (path->fp_type)
{
case FIB_PATH_TYPE_RECEIVE:
api_rpath->rpath.frp_addr = path->receive.fp_addr;
api_rpath->rpath.frp_sw_if_index = path->receive.fp_interface;
api_rpath->dpo = path->fp_dpo;
break;
case FIB_PATH_TYPE_ATTACHED:
api_rpath->rpath.frp_sw_if_index = path->attached.fp_interface;
api_rpath->dpo = path->fp_dpo;
break;
case FIB_PATH_TYPE_ATTACHED_NEXT_HOP:
api_rpath->rpath.frp_sw_if_index = path->attached_next_hop.fp_interface;
api_rpath->rpath.frp_addr = path->attached_next_hop.fp_nh;
break;
case FIB_PATH_TYPE_SPECIAL:
break;
case FIB_PATH_TYPE_DEAG:
break;
case FIB_PATH_TYPE_RECURSIVE:
api_rpath->rpath.frp_addr = path->recursive.fp_nh.fp_ip;
break;
default:
break;
}
return (FIB_PATH_LIST_WALK_CONTINUE);
}
dpo_proto_t
fib_path_get_proto (fib_node_index_t path_index)
{
fib_path_t *path;
path = fib_path_get(path_index);
return (path->fp_nh_proto);
}
void
fib_path_module_init (void)
{
fib_node_register_type (FIB_NODE_TYPE_PATH, &fib_path_vft);
}
static clib_error_t *
show_fib_path_command (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
fib_node_index_t pi;
fib_path_t *path;
if (unformat (input, "%d", &pi))
{
/*
* show one in detail
*/
if (!pool_is_free_index(fib_path_pool, pi))
{
path = fib_path_get(pi);
u8 *s = fib_path_format(pi, NULL);
s = format(s, "children:");
s = fib_node_children_format(path->fp_node.fn_children, s);
vlib_cli_output (vm, "%s", s);
vec_free(s);
}
else
{
vlib_cli_output (vm, "path %d invalid", pi);
}
}
else
{
vlib_cli_output (vm, "FIB Paths");
pool_foreach(path, fib_path_pool,
({
vlib_cli_output (vm, "%U", format_fib_path, path);
}));
}
return (NULL);
}
VLIB_CLI_COMMAND (show_fib_path, static) = {
.path = "show fib paths",
.function = show_fib_path_command,
.short_help = "show fib paths",
};