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Static: Support for BFD controlled static routes

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This commit is contained in:
Ondrej Zajicek 2015-07-24 18:02:07 +02:00
parent 1321e12ac4
commit 538264cf1a
4 changed files with 141 additions and 37 deletions
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6
nest/bfd.h
View file

@ -32,6 +32,12 @@ struct bfd_request {
};
#define BFD_STATE_ADMIN_DOWN 0
#define BFD_STATE_DOWN 1
#define BFD_STATE_INIT 2
#define BFD_STATE_UP 3
#ifdef CONFIG_BFD
struct bfd_request * bfd_request_session(pool *p, ip_addr addr, ip_addr local, struct iface *iface, void (*hook)(struct bfd_request *), void *data);

21
proto/static/config.Y
View file

@ -16,10 +16,22 @@ CF_DEFINES
static struct static_route *this_srt, *this_srt_nh, *last_srt_nh;
static struct f_inst **this_srt_last_cmd;
static void
static_route_finish(void)
{
struct static_route *r;
/* Update undefined use_bfd entries in multipath nexthops */
if (this_srt->dest == RTD_MULTIPATH)
for (r = this_srt->mp_next; r; r = r->mp_next)
if (r->use_bfd < 0)
r->use_bfd = this_srt->use_bfd;
}
CF_DECLS
CF_KEYWORDS(STATIC, ROUTE, VIA, DROP, REJECT, PROHIBIT, PREFERENCE, CHECK, LINK)
CF_KEYWORDS(MULTIPATH, WEIGHT, RECURSIVE, IGP, TABLE, BLACKHOLE, UNREACHABLE)
CF_KEYWORDS(MULTIPATH, WEIGHT, RECURSIVE, IGP, TABLE, BLACKHOLE, UNREACHABLE, BFD)
CF_GRAMMAR
@ -37,7 +49,7 @@ static_proto:
| static_proto proto_item ';'
| static_proto CHECK LINK bool ';' { STATIC_CFG->check_link = $4; }
| static_proto IGP TABLE rtable ';' { STATIC_CFG->igp_table = $4; }
| static_proto stat_route stat_route_opt_list ';'
| static_proto stat_route stat_route_opt_list ';' { static_route_finish(); }
;
stat_route0: ROUTE prefix {
@ -57,11 +69,15 @@ stat_multipath1:
this_srt_nh->via = $2;
this_srt_nh->via_if = $3;
this_srt_nh->if_name = (void *) this_srt; /* really */
this_srt_nh->use_bfd = -1; /* undefined */
}
| stat_multipath1 WEIGHT expr {
this_srt_nh->masklen = $3 - 1; /* really */
if (($3<1) || ($3>256)) cf_error("Weight must be in range 1-256");
}
| stat_multipath1 BFD bool {
this_srt_nh->use_bfd = $3; cf_check_bfd($3);
}
;
stat_multipath:
@ -98,6 +114,7 @@ stat_route:
stat_route_item:
cmd { *this_srt_last_cmd = $1; this_srt_last_cmd = &($1->next); }
| BFD bool ';' { this_srt->use_bfd = $2; cf_check_bfd($2); }
;
stat_route_opts:

146
proto/static/static.c
View file

@ -141,6 +141,29 @@ static_remove(struct proto *p, struct static_route *r)
r->installed = 0;
}
static void
static_bfd_notify(struct bfd_request *req);
static void
static_update_bfd(struct proto *p, struct static_route *r)
{
struct neighbor *nb = r->neigh;
int bfd_up = (nb->scope > 0) && r->use_bfd;
if (bfd_up && !r->bfd_req)
{
// ip_addr local = ipa_nonzero(r->local) ? r->local : nb->ifa->ip;
r->bfd_req = bfd_request_session(p->pool, r->via, nb->ifa->ip, nb->iface,
static_bfd_notify, r);
}
if (!bfd_up && r->bfd_req)
{
rfree(r->bfd_req);
r->bfd_req = NULL;
}
}
static int
static_decide(struct static_config *cf, struct static_route *r)
{
@ -153,6 +176,9 @@ static_decide(struct static_config *cf, struct static_route *r)
if (cf->check_link && !(r->neigh->iface->flags & IF_LINK_UP))
return 0;
if (r->bfd_req && r->bfd_req->state != BFD_STATE_UP)
return 0;
return 1;
}
@ -171,6 +197,8 @@ static_add(struct proto *p, struct static_config *cf, struct static_route *r)
r->chain = n->data;
n->data = r;
r->neigh = n;
static_update_bfd(p, r);
if (static_decide(cf, r))
static_install(p, r, n->iface);
else
@ -200,6 +228,8 @@ static_add(struct proto *p, struct static_config *cf, struct static_route *r)
r2->chain = n->data;
n->data = r2;
r2->neigh = n;
static_update_bfd(p, r2);
r2->installed = static_decide(cf, r2);
count += r2->installed;
}
@ -222,6 +252,26 @@ static_add(struct proto *p, struct static_config *cf, struct static_route *r)
}
}
static void
static_rte_cleanup(struct proto *p, struct static_route *r)
{
struct static_route *r2;
if (r->bfd_req)
{
rfree(r->bfd_req);
r->bfd_req = NULL;
}
if (r->dest == RTD_MULTIPATH)
for (r2 = r->mp_next; r2; r2 = r2->mp_next)
if (r2->bfd_req)
{
rfree(r2->bfd_req);
r2->bfd_req = NULL;
}
}
static int
static_start(struct proto *p)
{
@ -254,7 +304,10 @@ static_shutdown(struct proto *p)
WALK_LIST(r, cf->iface_routes)
r->installed = 0;
WALK_LIST(r, cf->other_routes)
{
static_rte_cleanup(p, r);
r->installed = 0;
}
return PS_DOWN;
}
@ -268,6 +321,44 @@ static_cleanup(struct proto *p)
rt_unlock_table(cf->igp_table->table);
}
static void
static_update_rte(struct proto *p, struct static_route *r)
{
switch (r->dest)
{
case RTD_ROUTER:
if (static_decide((struct static_config *) p->cf, r))
static_install(p, r, r->neigh->iface);
else
static_remove(p, r);
break;
case RTD_NONE: /* a part of multipath route */
{
int decision = static_decide((struct static_config *) p->cf, r);
if (decision == r->installed)
break; /* no change */
r->installed = decision;
struct static_route *r1, *r2;
int count = 0;
r1 = (void *) r->if_name; /* really */
for (r2 = r1->mp_next; r2; r2 = r2->mp_next)
count += r2->installed;
if (count)
{
/* Set of nexthops changed - force reinstall */
r1->installed = 0;
static_install(p, r1, NULL);
}
else
static_remove(p, r1);
break;
}
}
}
static void
static_neigh_notify(struct neighbor *n)
@ -277,40 +368,21 @@ static_neigh_notify(struct neighbor *n)
DBG("Static: neighbor notify for %I: iface %p\n", n->addr, n->iface);
for(r=n->data; r; r=r->chain)
switch (r->dest)
{
case RTD_ROUTER:
if (static_decide((struct static_config *) p->cf, r))
static_install(p, r, n->iface);
else
static_remove(p, r);
break;
{
static_update_bfd(p, r);
static_update_rte(p, r);
}
}
case RTD_NONE: /* a part of multipath route */
{
int decision = static_decide((struct static_config *) p->cf, r);
if (decision == r->installed)
break; /* no change */
r->installed = decision;
static void
static_bfd_notify(struct bfd_request *req)
{
struct static_route *r = req->data;
struct proto *p = r->neigh->proto;
struct static_route *r1, *r2;
int count = 0;
r1 = (void *) r->if_name; /* really */
for (r2 = r1->mp_next; r2; r2 = r2->mp_next)
count += r2->installed;
// if (req->down) TRACE(D_EVENTS, "BFD session down for nbr %I on %s", XXXX);
if (count)
{
/* Set of nexthops changed - force reinstall */
r1->installed = 0;
static_install(p, r1, NULL);
}
else
static_remove(p, r1);
break;
}
}
static_update_rte(p, r);
}
static void
@ -414,7 +486,7 @@ static_same_dest(struct static_route *x, struct static_route *y)
for (x = x->mp_next, y = y->mp_next;
x && y;
x = x->mp_next, y = y->mp_next)
if (!ipa_equal(x->via, y->via) || (x->via_if != y->via_if))
if (!ipa_equal(x->via, y->via) || (x->via_if != y->via_if) || (x->use_bfd != y->use_bfd))
return 0;
return !x && !y;
@ -499,6 +571,9 @@ static_reconfigure(struct proto *p, struct proto_config *new)
WALK_LIST(r, n->other_routes)
static_add(p, n, r);
WALK_LIST(r, o->other_routes)
static_rte_cleanup(p, r);
return 1;
}
@ -584,13 +659,14 @@ static_show_rt(struct static_route *r)
case RTDX_RECURSIVE: bsprintf(via, "recursive %I", r->via); break;
default: bsprintf(via, "???");
}
cli_msg(-1009, "%I/%d %s%s", r->net, r->masklen, via, r->installed ? "" : " (dormant)");
cli_msg(-1009, "%I/%d %s%s%s", r->net, r->masklen, via,
r->bfd_req ? " (bfd)" : "", r->installed ? "" : " (dormant)");
struct static_route *r2;
if (r->dest == RTD_MULTIPATH)
for (r2 = r->mp_next; r2; r2 = r2->mp_next)
cli_msg(-1009, "\tvia %I%J weight %d%s", r2->via, r2->via_if, r2->masklen + 1, /* really */
r2->installed ? "" : " (dormant)");
cli_msg(-1009, "\tvia %I%J weight %d%s%s", r2->via, r2->via_if, r2->masklen + 1, /* really */
r2->bfd_req ? " (bfd)" : "", r2->installed ? "" : " (dormant)");
}
void

5
proto/static/static.h
View file

@ -9,6 +9,9 @@
#ifndef _BIRD_STATIC_H_
#define _BIRD_STATIC_H_
#include "nest/route.h"
#include "nest/bfd.h"
struct static_config {
struct proto_config c;
list iface_routes; /* Routes to search on interface events */
@ -33,6 +36,8 @@ struct static_route {
struct static_route *mp_next; /* Nexthops for RTD_MULTIPATH routes */
struct f_inst *cmds; /* List of commands for setting attributes */
int installed; /* Installed in rt table, -1 for reinstall */
int use_bfd; /* Configured to use BFD */
struct bfd_request *bfd_req; /* BFD request, if BFD is used */
};
/* Dummy nodes (parts of multipath route) abuses masklen field for weight