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frr/zebra/zebra_rnh.c
Timo Teräs 2f97fa65ff zebra: make ZEBRA_FLAG_CHANGED internal status 
This flag is used internally in zebra only. And it makes no sense
to expose it over the zclient API, as having it set from client
could corrupt the internal state.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Acked-by: Donald Sharp <sharpd@cumulusnetworks.com>
(cherry picked from commit 7eb6136b2732d4782360f9f376336c6d4f667ff0)
2016-08-19 16:30:47 -04:00

996 lines
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/* Zebra next hop tracking code
* Copyright (C) 2013 Cumulus Networks, Inc.
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "prefix.h"
#include "table.h"
#include "memory.h"
#include "str.h"
#include "command.h"
#include "if.h"
#include "log.h"
#include "sockunion.h"
#include "linklist.h"
#include "thread.h"
#include "workqueue.h"
#include "prefix.h"
#include "routemap.h"
#include "stream.h"
#include "nexthop.h"
#include "vrf.h"
#include "zebra/rib.h"
#include "zebra/rt.h"
#include "zebra/zserv.h"
#include "zebra/zebra_ns.h"
#include "zebra/zebra_vrf.h"
#include "zebra/redistribute.h"
#include "zebra/debug.h"
#include "zebra/zebra_rnh.h"
#include "zebra/zebra_routemap.h"
#include "zebra/interface.h"
static void free_state(vrf_id_t vrf_id, struct rib *rib, struct route_node *rn);
static void copy_state(struct rnh *rnh, struct rib *rib,
struct route_node *rn);
#define lookup_rnh_table(v, f) \
({ \
struct zebra_vrf *zvrf; \
struct route_table *t = NULL; \
zvrf = zebra_vrf_lookup(v); \
if (zvrf) \
t = zvrf->rnh_table[family2afi(f)]; \
t; \
})
static int compare_state(struct rib *r1, struct rib *r2);
static int send_client(struct rnh *rnh, struct zserv *client, rnh_type_t type,
vrf_id_t vrf_id);
static void print_rnh(struct route_node *rn, struct vty *vty);
int zebra_rnh_ip_default_route = 0;
int zebra_rnh_ipv6_default_route = 0;
static inline struct route_table *get_rnh_table(vrf_id_t vrfid, int family,
rnh_type_t type)
{
struct zebra_vrf *zvrf;
struct route_table *t = NULL;
zvrf = zebra_vrf_lookup(vrfid);
if (zvrf)
switch (type)
{
case RNH_NEXTHOP_TYPE:
t = zvrf->rnh_table[family2afi(family)];
break;
case RNH_IMPORT_CHECK_TYPE:
t = zvrf->import_check_table[family2afi(family)];
break;
}
return t;
}
char *rnh_str (struct rnh *rnh, char *buf, int size)
{
prefix2str(&(rnh->node->p), buf, size);
return buf;
}
struct rnh *
zebra_add_rnh (struct prefix *p, vrf_id_t vrfid, rnh_type_t type)
{
struct route_table *table;
struct route_node *rn;
struct rnh *rnh = NULL;
char buf[PREFIX2STR_BUFFER];
if (IS_ZEBRA_DEBUG_NHT)
{
prefix2str(p, buf, sizeof (buf));
zlog_debug("%u: Add RNH %s type %d", vrfid, buf, type);
}
table = get_rnh_table(vrfid, PREFIX_FAMILY(p), type);
if (!table)
{
prefix2str(p, buf, sizeof (buf));
zlog_warn("%u: Add RNH %s type %d - table not found",
vrfid, buf, type);
return NULL;
}
/* Make it sure prefixlen is applied to the prefix. */
apply_mask (p);
/* Lookup (or add) route node.*/
rn = route_node_get (table, p);
if (!rn->info)
{
rnh = XCALLOC(MTYPE_RNH, sizeof(struct rnh));
rnh->client_list = list_new();
rnh->vrf_id = vrfid;
rnh->zebra_static_route_list = list_new();
route_lock_node (rn);
rn->info = rnh;
rnh->node = rn;
}
route_unlock_node (rn);
return (rn->info);
}
struct rnh *
zebra_lookup_rnh (struct prefix *p, vrf_id_t vrfid, rnh_type_t type)
{
struct route_table *table;
struct route_node *rn;
table = get_rnh_table(vrfid, PREFIX_FAMILY(p), type);
if (!table)
return NULL;
/* Make it sure prefixlen is applied to the prefix. */
apply_mask (p);
/* Lookup route node.*/
rn = route_node_lookup (table, p);
if (!rn)
return NULL;
route_unlock_node (rn);
return (rn->info);
}
void
zebra_delete_rnh (struct rnh *rnh, rnh_type_t type)
{
struct route_node *rn;
if (!rnh || (rnh->flags & ZEBRA_NHT_DELETED) || !(rn = rnh->node))
return;
if (IS_ZEBRA_DEBUG_NHT)
{
char buf[PREFIX2STR_BUFFER];
zlog_debug("%u: Del RNH %s type %d",
rnh->vrf_id, rnh_str(rnh, buf, sizeof (buf)), type);
}
rnh->flags |= ZEBRA_NHT_DELETED;
list_free(rnh->client_list);
list_free(rnh->zebra_static_route_list);
free_state(rnh->vrf_id, rnh->state, rn);
XFREE(MTYPE_RNH, rn->info);
rn->info = NULL;
route_unlock_node (rn);
return;
}
void
zebra_add_rnh_client (struct rnh *rnh, struct zserv *client, rnh_type_t type,
vrf_id_t vrf_id)
{
if (IS_ZEBRA_DEBUG_NHT)
{
char buf[PREFIX2STR_BUFFER];
zlog_debug("%u: Client %s registers for RNH %s type %d",
vrf_id, zebra_route_string(client->proto),
rnh_str(rnh, buf, sizeof (buf)), type);
}
if (!listnode_lookup(rnh->client_list, client))
{
listnode_add(rnh->client_list, client);
send_client(rnh, client, type, vrf_id); // Pending: check if its needed
}
}
void
zebra_remove_rnh_client (struct rnh *rnh, struct zserv *client, rnh_type_t type)
{
if (IS_ZEBRA_DEBUG_NHT)
{
char buf[PREFIX2STR_BUFFER];
zlog_debug("Client %s unregisters for RNH %s type %d",
zebra_route_string(client->proto),
rnh_str(rnh, buf, sizeof (buf)), type);
}
listnode_delete(rnh->client_list, client);
if (list_isempty(rnh->client_list) &&
list_isempty(rnh->zebra_static_route_list))
zebra_delete_rnh(rnh, type);
}
void
zebra_register_rnh_static_nh(vrf_id_t vrf_id, struct prefix *nh,
struct route_node *static_rn)
{
struct rnh *rnh;
rnh = zebra_add_rnh(nh, vrf_id, RNH_NEXTHOP_TYPE);
if (rnh && !listnode_lookup(rnh->zebra_static_route_list, static_rn))
{
listnode_add(rnh->zebra_static_route_list, static_rn);
}
}
void
zebra_deregister_rnh_static_nh(vrf_id_t vrf_id, struct prefix *nh,
struct route_node *static_rn)
{
struct rnh *rnh;
rnh = zebra_lookup_rnh(nh, vrf_id, RNH_NEXTHOP_TYPE);
if (!rnh || (rnh->flags & ZEBRA_NHT_DELETED))
return;
listnode_delete(rnh->zebra_static_route_list, static_rn);
if (list_isempty(rnh->client_list) &&
list_isempty(rnh->zebra_static_route_list))
zebra_delete_rnh(rnh, RNH_NEXTHOP_TYPE);
}
void
zebra_deregister_rnh_static_nexthops (vrf_id_t vrf_id, struct nexthop *nexthop,
struct route_node *rn)
{
struct nexthop *nh;
struct prefix nh_p;
for (nh = nexthop; nh ; nh = nh->next)
{
switch (nh->type)
{
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
nh_p.family = AF_INET;
nh_p.prefixlen = IPV4_MAX_BITLEN;
nh_p.u.prefix4 = nh->gate.ipv4;
break;
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IPV6_IFINDEX:
nh_p.family = AF_INET6;
nh_p.prefixlen = IPV6_MAX_BITLEN;
nh_p.u.prefix6 = nh->gate.ipv6;
break;
/*
* Not sure what really to do here, we are not
* supposed to have either of these for NHT
* and the code has no way to know what prefix
* to use. So I'm going to just continue
* for the moment, which is preferable to
* what is currently happening which is a
* CRASH and BURN.
* Some simple testing shows that we
* are not leaving slag around for these
* skipped static routes. Since
* they don't appear to be installed
*/
case NEXTHOP_TYPE_IFINDEX:
case NEXTHOP_TYPE_BLACKHOLE:
continue;
break;
}
zebra_deregister_rnh_static_nh(vrf_id, &nh_p, rn);
}
}
/* Apply the NHT route-map for a client to the route (and nexthops)
* resolving a NH.
*/
static int
zebra_rnh_apply_nht_rmap(int family, struct route_node *prn,
struct rib *rib, int proto)
{
int at_least_one = 0;
int rmap_family; /* Route map has diff AF family enum */
struct nexthop *nexthop;
int ret;
rmap_family = (family == AF_INET) ? AFI_IP : AFI_IP6;
if (prn && rib)
{
for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
{
ret = zebra_nht_route_map_check(rmap_family, proto, &prn->p, rib,
nexthop);
if (ret != RMAP_DENYMATCH)
{
SET_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE);
at_least_one++; /* at least one valid NH */
}
else
{
UNSET_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE);
}
}
}
return (at_least_one);
}
/*
* Determine appropriate route (RIB entry) resolving a tracked entry
* (nexthop or BGP route for import).
*/
static struct rib *
zebra_rnh_resolve_entry (vrf_id_t vrfid, int family, rnh_type_t type,
struct route_node *nrn, struct rnh *rnh,
struct route_node **prn)
{
struct route_table *route_table;
struct route_node *rn;
struct rib *rib;
*prn = NULL;
route_table = zebra_vrf_table(family2afi(family), SAFI_UNICAST, vrfid);
if (!route_table) // unexpected
return NULL;
rn = route_node_match(route_table, &nrn->p);
if (!rn)
return NULL;
/* Do not resolve over default route unless allowed &&
* match route to be exact if so specified
*/
if ((type == RNH_NEXTHOP_TYPE) &&
(is_default_prefix (&rn->p) &&
!nh_resolve_via_default(rn->p.family)))
rib = NULL;
else if ((type == RNH_IMPORT_CHECK_TYPE) &&
((is_default_prefix(&rn->p)) ||
((CHECK_FLAG(rnh->flags, ZEBRA_NHT_EXACT_MATCH)) &&
!prefix_same(&nrn->p, &rn->p))))
rib = NULL;
else
{
/* Identify appropriate route entry. */
RNODE_FOREACH_RIB(rn, rib)
{
if (CHECK_FLAG (rib->status, RIB_ENTRY_REMOVED))
continue;
if (CHECK_FLAG (rib->flags, ZEBRA_FLAG_SELECTED))
{
if (CHECK_FLAG(rnh->flags, ZEBRA_NHT_CONNECTED))
{
if (rib->type == ZEBRA_ROUTE_CONNECT)
break;
}
else if ((type == RNH_IMPORT_CHECK_TYPE) &&
(rib->type == ZEBRA_ROUTE_BGP))
continue;
else
break;
}
}
}
/* Need to unlock route node */
route_unlock_node(rn);
if (rib)
*prn = rn;
return rib;
}
/*
* See if a tracked route entry for import (by BGP) has undergone any
* change, and if so, notify the client.
*/
static void
zebra_rnh_eval_import_check_entry (vrf_id_t vrfid, int family, int force,
struct route_node *nrn, struct rnh *rnh,
struct rib *rib)
{
int state_changed = 0;
struct zserv *client;
char bufn[INET6_ADDRSTRLEN];
struct listnode *node;
struct nexthop *nexthop, *tnexthop;
int recursing;
if (rib && (rnh->state == NULL))
{
for (ALL_NEXTHOPS_RO(rib->nexthop, nexthop, tnexthop, recursing))
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))
{
state_changed = 1;
break;
}
}
else if (!rib && (rnh->state != NULL))
state_changed = 1;
if (compare_state(rib, rnh->state))
copy_state(rnh, rib, nrn);
if (state_changed || force)
{
if (IS_ZEBRA_DEBUG_NHT)
{
prefix2str(&nrn->p, bufn, INET6_ADDRSTRLEN);
zlog_debug("%u:%s: Route import check %s %s\n",
vrfid, bufn, rnh->state ? "passed" : "failed",
state_changed ? "(state changed)" : "");
}
/* state changed, notify clients */
for (ALL_LIST_ELEMENTS_RO(rnh->client_list, node, client))
{
send_client(rnh, client, RNH_IMPORT_CHECK_TYPE, vrfid);
}
}
}
/*
* Notify clients registered for this nexthop about a change.
*/
static void
zebra_rnh_notify_protocol_clients (vrf_id_t vrfid, int family,
struct route_node *nrn, struct rnh *rnh,
struct route_node *prn, struct rib *rib)
{
struct listnode *node;
struct zserv *client;
char bufn[INET6_ADDRSTRLEN];
char bufp[INET6_ADDRSTRLEN];
int num_resolving_nh;
if (IS_ZEBRA_DEBUG_NHT)
{
prefix2str(&nrn->p, bufn, INET6_ADDRSTRLEN);
if (prn && rib)
{
prefix2str(&prn->p, bufp, INET6_ADDRSTRLEN);
zlog_debug("%u:%s: NH resolved over route %s", vrfid, bufn, bufp);
}
else
zlog_debug("%u:%s: NH has become unresolved", vrfid, bufn);
}
for (ALL_LIST_ELEMENTS_RO(rnh->client_list, node, client))
{
if (prn && rib)
{
/* Apply route-map for this client to route resolving this
* nexthop to see if it is filtered or not.
*/
num_resolving_nh = zebra_rnh_apply_nht_rmap(family, prn, rib,
client->proto);
if (num_resolving_nh)
rnh->filtered[client->proto] = 0;
else
rnh->filtered[client->proto] = 1;
if (IS_ZEBRA_DEBUG_NHT)
zlog_debug("%u:%s: Notifying client %s about NH %s",
vrfid, bufn, zebra_route_string(client->proto),
num_resolving_nh ? "" : "(filtered by route-map)");
}
else
{
rnh->filtered[client->proto] = 0;
if (IS_ZEBRA_DEBUG_NHT)
zlog_debug("%u:%s: Notifying client %s about NH (unreachable)",
vrfid, bufn, zebra_route_string(client->proto));
}
send_client(rnh, client, RNH_NEXTHOP_TYPE, vrfid);
}
}
static void
zebra_rnh_process_static_routes (vrf_id_t vrfid, int family,
struct route_node *nrn, struct rnh *rnh,
struct route_node *prn, struct rib *rib)
{
struct listnode *node;
int num_resolving_nh = 0;
struct route_node *static_rn;
struct rib *srib;
struct nexthop *nexthop;
char bufn[INET6_ADDRSTRLEN];
char bufp[INET6_ADDRSTRLEN];
char bufs[INET6_ADDRSTRLEN];
if (IS_ZEBRA_DEBUG_NHT)
{
prefix2str(&nrn->p, bufn, INET6_ADDRSTRLEN);
if (prn)
prefix2str(&prn->p, bufp, INET6_ADDRSTRLEN);
}
if (prn && rib)
{
/* Apply route-map for "static" to route resolving this
* nexthop to see if it is filtered or not.
*/
num_resolving_nh = zebra_rnh_apply_nht_rmap(family, prn, rib,
ZEBRA_ROUTE_STATIC);
if (num_resolving_nh)
rnh->filtered[ZEBRA_ROUTE_STATIC] = 0;
else
rnh->filtered[ZEBRA_ROUTE_STATIC] = 1;
}
else
rnh->filtered[ZEBRA_ROUTE_STATIC] = 0;
/* Evaluate each static route associated with this nexthop. */
for (ALL_LIST_ELEMENTS_RO(rnh->zebra_static_route_list, node,
static_rn))
{
RNODE_FOREACH_RIB(static_rn, srib)
{
if (srib->type == ZEBRA_ROUTE_STATIC)
break; /* currently works for only 1 static route. */
}
if (!srib) // unexpected
continue;
/* Set the filter flag for the correct nexthop - static route may
* be having multiple. We care here only about registered nexthops.
*/
for (nexthop = srib->nexthop; nexthop; nexthop = nexthop->next)
{
switch (nexthop->type)
{
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
if (nexthop->gate.ipv4.s_addr == nrn->p.u.prefix4.s_addr)
{
if (num_resolving_nh)
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_FILTERED);
else
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FILTERED);
}
break;
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IPV6_IFINDEX:
if (memcmp(&nexthop->gate.ipv6,&nrn->p.u.prefix6, 16) == 0)
{
if (num_resolving_nh)
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_FILTERED);
else
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FILTERED);
}
break;
default:
break;
}
}
if (IS_ZEBRA_DEBUG_NHT)
{
prefix2str(&static_rn->p, bufs, INET6_ADDRSTRLEN);
if (prn && rib)
zlog_debug("%u:%s: NH change %s, scheduling static route %s",
vrfid, bufn, num_resolving_nh ?
"" : "(filtered by route-map)", bufs);
else
zlog_debug("%u:%s: NH unreachable, scheduling static route %s",
vrfid, bufn, bufs);
}
SET_FLAG(srib->flags, RIB_ENTRY_CHANGED);
SET_FLAG(srib->status, RIB_ENTRY_NEXTHOPS_CHANGED);
rib_queue_add(static_rn);
}
}
/*
* See if a tracked nexthop entry has undergone any change, and if so,
* take appropriate action; this involves notifying any clients and/or
* scheduling dependent static routes for processing.
*/
static void
zebra_rnh_eval_nexthop_entry (vrf_id_t vrfid, int family, int force,
struct route_node *nrn, struct rnh *rnh,
struct route_node *prn, struct rib *rib)
{
int state_changed = 0;
/* If we're resolving over a different route, resolution has changed or
* the resolving route has some change (e.g., metric), there is a state
* change.
*/
if (!prefix_same(&rnh->resolved_route, &prn->p))
{
if (rib)
UNSET_FLAG(rib->status, RIB_ENTRY_NEXTHOPS_CHANGED);
if (prn)
prefix_copy(&rnh->resolved_route, &prn->p);
else
memset(&rnh->resolved_route, 0, sizeof(struct prefix));
copy_state(rnh, rib, nrn);
state_changed = 1;
}
else if (compare_state(rib, rnh->state))
{
if (rib)
UNSET_FLAG(rib->status, RIB_ENTRY_NEXTHOPS_CHANGED);
copy_state(rnh, rib, nrn);
state_changed = 1;
}
if (state_changed || force)
{
/* NOTE: Use the "copy" of resolving route stored in 'rnh' i.e.,
* rnh->state.
*/
/* Notify registered protocol clients. */
zebra_rnh_notify_protocol_clients (vrfid, family, nrn, rnh,
prn, rnh->state);
/* Process static routes attached to this nexthop */
zebra_rnh_process_static_routes (vrfid, family, nrn, rnh,
prn, rnh->state);
}
}
/* Evaluate one tracked entry */
static void
zebra_rnh_evaluate_entry (vrf_id_t vrfid, int family, int force, rnh_type_t type,
struct route_node *nrn)
{
struct rnh *rnh;
struct rib *rib;
struct route_node *prn;
char bufn[INET6_ADDRSTRLEN];
if (IS_ZEBRA_DEBUG_NHT)
{
prefix2str(&nrn->p, bufn, INET6_ADDRSTRLEN);
zlog_debug("%u:%s: Evaluate RNH, type %d %s",
vrfid, bufn, type, force ? "(force)" : "");
}
rnh = nrn->info;
/* Identify route entry (RIB) resolving this tracked entry. */
rib = zebra_rnh_resolve_entry (vrfid, family, type, nrn, rnh, &prn);
/* If the entry cannot be resolved and that is also the existing state,
* there is nothing further to do.
*/
if (!rib && rnh->state == NULL && !force)
return;
/* Process based on type of entry. */
if (type == RNH_IMPORT_CHECK_TYPE)
zebra_rnh_eval_import_check_entry (vrfid, family, force,
nrn, rnh, rib);
else
zebra_rnh_eval_nexthop_entry (vrfid, family, force,
nrn, rnh, prn, rib);
}
/* Evaluate all tracked entries (nexthops or routes for import into BGP)
* of a particular VRF and address-family or a specific prefix.
*/
void
zebra_evaluate_rnh (vrf_id_t vrfid, int family, int force, rnh_type_t type,
struct prefix *p)
{
struct route_table *rnh_table;
struct route_node *nrn;
rnh_table = get_rnh_table(vrfid, family, type);
if (!rnh_table) // unexpected
return;
if (p)
{
/* Evaluating a specific entry, make sure it exists. */
nrn = route_node_lookup (rnh_table, p);
if (nrn && nrn->info)
zebra_rnh_evaluate_entry (vrfid, family, force, type, nrn);
if (nrn)
route_unlock_node (nrn);
}
else
{
/* Evaluate entire table. */
nrn = route_top (rnh_table);
while (nrn)
{
if (nrn->info)
zebra_rnh_evaluate_entry (vrfid, family, force, type, nrn);
nrn = route_next(nrn); /* this will also unlock nrn */
}
}
}
void
zebra_print_rnh_table (vrf_id_t vrfid, int af, struct vty *vty, rnh_type_t type)
{
struct route_table *table;
struct route_node *rn;
table = get_rnh_table(vrfid, af, type);
if (!table)
{
zlog_debug("print_rnhs: rnh table not found\n");
return;
}
for (rn = route_top(table); rn; rn = route_next(rn))
if (rn->info)
print_rnh(rn, vty);
}
int
zebra_cleanup_rnh_client (vrf_id_t vrf_id, int family, struct zserv *client,
rnh_type_t type)
{
struct route_table *ntable;
struct route_node *nrn;
struct rnh *rnh;
if (IS_ZEBRA_DEBUG_NHT)
zlog_debug("%u: Client %s RNH cleanup for family %d type %d",
vrf_id, zebra_route_string(client->proto), family, type);
ntable = get_rnh_table(vrf_id, family, type);
if (!ntable)
{
zlog_debug("cleanup_rnh_client: rnh table not found\n");
return -1;
}
for (nrn = route_top (ntable); nrn; nrn = route_next (nrn))
{
if (!nrn->info)
continue;
rnh = nrn->info;
zebra_remove_rnh_client(rnh, client, type);
}
return 1;
}
/**
* free_state - free up the rib structure associated with the rnh.
*/
static void
free_state (vrf_id_t vrf_id, struct rib *rib, struct route_node *rn)
{
if (!rib)
return;
/* free RIB and nexthops */
zebra_deregister_rnh_static_nexthops (vrf_id, rib->nexthop, rn);
nexthops_free(rib->nexthop);
XFREE (MTYPE_RIB, rib);
}
static void
copy_state (struct rnh *rnh, struct rib *rib, struct route_node *rn)
{
struct rib *state;
struct nexthop *nh;
if (rnh->state)
{
free_state(rnh->vrf_id, rnh->state, rn);
rnh->state = NULL;
}
if (!rib)
return;
state = XCALLOC (MTYPE_RIB, sizeof (struct rib));
state->type = rib->type;
state->metric = rib->metric;
for (nh = rib->nexthop; nh; nh = nh->next)
rib_copy_nexthops(state, nh);
rnh->state = state;
}
static int
compare_state (struct rib *r1, struct rib *r2)
{
if (!r1 && !r2)
return 0;
if ((!r1 && r2) || (r1 && !r2))
return 1;
if (r1->metric != r2->metric)
return 1;
if (r1->nexthop_num != r2->nexthop_num)
return 1;
if (CHECK_FLAG(r1->status, RIB_ENTRY_NEXTHOPS_CHANGED))
return 1;
return 0;
}
static int
send_client (struct rnh *rnh, struct zserv *client, rnh_type_t type, vrf_id_t vrf_id)
{
struct stream *s;
struct rib *rib;
unsigned long nump;
u_char num;
struct nexthop *nexthop;
struct route_node *rn;
int cmd = (type == RNH_IMPORT_CHECK_TYPE)
? ZEBRA_IMPORT_CHECK_UPDATE : ZEBRA_NEXTHOP_UPDATE;
rn = rnh->node;
rib = rnh->state;
/* Get output stream. */
s = client->obuf;
stream_reset (s);
zserv_create_header (s, cmd, vrf_id);
stream_putw(s, rn->p.family);
switch (rn->p.family)
{
case AF_INET:
stream_putc(s, rn->p.prefixlen);
stream_put_in_addr(s, &rn->p.u.prefix4);
break;
case AF_INET6:
stream_putc(s, rn->p.prefixlen);
stream_put(s, &rn->p.u.prefix6, IPV6_MAX_BYTELEN);
break;
default:
zlog_err("%s: Unknown family (%d) notification attempted\n",
__FUNCTION__, rn->p.family);
break;
}
if (rib)
{
stream_putl (s, rib->metric);
num = 0;
nump = stream_get_endp(s);
stream_putc (s, 0);
for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
if ((CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB) ||
CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) &&
CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
{
stream_putc (s, nexthop->type);
switch (nexthop->type)
{
case ZEBRA_NEXTHOP_IPV4:
stream_put_in_addr (s, &nexthop->gate.ipv4);
break;
case ZEBRA_NEXTHOP_IFINDEX:
stream_putl (s, nexthop->ifindex);
break;
case ZEBRA_NEXTHOP_IPV4_IFINDEX:
stream_put_in_addr (s, &nexthop->gate.ipv4);
stream_putl (s, nexthop->ifindex);
break;
#ifdef HAVE_IPV6
case ZEBRA_NEXTHOP_IPV6:
stream_put (s, &nexthop->gate.ipv6, 16);
break;
case ZEBRA_NEXTHOP_IPV6_IFINDEX:
stream_put (s, &nexthop->gate.ipv6, 16);
stream_putl (s, nexthop->ifindex);
break;
#endif /* HAVE_IPV6 */
default:
/* do nothing */
break;
}
num++;
}
stream_putc_at (s, nump, num);
}
else
{
stream_putl (s, 0);
stream_putc (s, 0);
}
stream_putw_at (s, 0, stream_get_endp (s));
client->nh_last_upd_time = quagga_monotime();
client->last_write_cmd = cmd;
return zebra_server_send_message(client);
}
static void
print_nh (struct nexthop *nexthop, struct vty *vty)
{
char buf[BUFSIZ];
struct zebra_ns *zns = zebra_ns_lookup (NS_DEFAULT);
switch (nexthop->type)
{
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
vty_out (vty, " via %s", inet_ntoa (nexthop->gate.ipv4));
if (nexthop->ifindex)
vty_out (vty, ", %s", ifindex2ifname_per_ns (zns, nexthop->ifindex));
break;
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IPV6_IFINDEX:
vty_out (vty, " %s",
inet_ntop (AF_INET6, &nexthop->gate.ipv6, buf, BUFSIZ));
if (nexthop->ifindex)
vty_out (vty, ", via %s", ifindex2ifname_per_ns (zns, nexthop->ifindex));
break;
case NEXTHOP_TYPE_IFINDEX:
vty_out (vty, " is directly connected, %s",
ifindex2ifname_per_ns (zns, nexthop->ifindex));
break;
case NEXTHOP_TYPE_BLACKHOLE:
vty_out (vty, " is directly connected, Null0");
break;
default:
break;
}
vty_out(vty, "%s", VTY_NEWLINE);
}
static void
print_rnh (struct route_node *rn, struct vty *vty)
{
struct rnh *rnh;
struct nexthop *nexthop;
struct listnode *node;
struct zserv *client;
char buf[BUFSIZ];
rnh = rn->info;
vty_out(vty, "%s%s%s", inet_ntop(rn->p.family, &rn->p.u.prefix, buf, BUFSIZ),
CHECK_FLAG(rnh->flags, ZEBRA_NHT_CONNECTED) ? "(Connected)" : "",
VTY_NEWLINE);
if (rnh->state)
{
vty_out(vty, " resolved via %s%s",
zebra_route_string(rnh->state->type), VTY_NEWLINE);
for (nexthop = rnh->state->nexthop; nexthop; nexthop = nexthop->next)
print_nh(nexthop, vty);
}
else
vty_out(vty, " unresolved%s%s",
CHECK_FLAG(rnh->flags, ZEBRA_NHT_CONNECTED) ? "(Connected)" : "",
VTY_NEWLINE);
vty_out(vty, " Client list:");
for (ALL_LIST_ELEMENTS_RO(rnh->client_list, node, client))
vty_out(vty, " %s(fd %d)%s", zebra_route_string(client->proto),
client->sock, rnh->filtered[client->proto] ? "(filtered)" : "");
if (!list_isempty(rnh->zebra_static_route_list))
vty_out(vty, " zebra%s", rnh->filtered[ZEBRA_ROUTE_STATIC] ? "(filtered)" : "");
vty_out(vty, "%s", VTY_NEWLINE);
}
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