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BGP: Moved the suppressed and stale flags to pflags

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This commit is contained in:
Maria Matejka 2020-02-10 15:01:36 +01:00
parent e42eedb912
commit ddd89ba12d
5 changed files with 39 additions and 32 deletions
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6
nest/route.h
View file

@ -244,12 +244,6 @@ typedef struct rte {
byte pflags; /* Protocol-specific flags */
btime lastmod; /* Last modified */
union { /* Protocol-dependent data (metrics etc.) */
#ifdef CONFIG_BGP
struct {
u8 suppressed; /* Used for deterministic MED comparison */
s8 stale; /* Route is LLGR_STALE, -1 if unknown */
} bgp;
#endif
} u;
} rte;

53
proto/bgp/attrs.c
View file

@ -1887,14 +1887,24 @@ bgp_get_neighbor(rte *r)
static inline int
rte_stale(rte *r)
{
if (r->u.bgp.stale < 0)
{
/* If staleness is unknown, compute and cache it */
eattr *a = ea_find(r->attrs->eattrs, EA_CODE(PROTOCOL_BGP, BA_COMMUNITY));
r->u.bgp.stale = a && int_set_contains(a->u.ptr, BGP_COMM_LLGR_STALE);
}
if (r->pflags & BGP_REF_STALE)
return 1;
return r->u.bgp.stale;
if (r->pflags & BGP_REF_NOT_STALE)
return 0;
/* If staleness is unknown, compute and cache it */
eattr *a = ea_find(r->attrs->eattrs, EA_CODE(PROTOCOL_BGP, BA_COMMUNITY));
if (a && int_set_contains(a->u.ptr, BGP_COMM_LLGR_STALE))
{
r->pflags |= BGP_REF_STALE;
return 1;
}
else
{
r->pflags |= BGP_REF_NOT_STALE;
return 0;
}
}
int
@ -1906,8 +1916,8 @@ bgp_rte_better(rte *new, rte *old)
u32 n, o;
/* Skip suppressed routes (see bgp_rte_recalculate()) */
n = new->u.bgp.suppressed;
o = old->u.bgp.suppressed;
n = new->pflags & BGP_REF_SUPPRESSED;
o = old->pflags & BGP_REF_SUPPRESSED;
if (n > o)
return 0;
if (n < o)
@ -2051,17 +2061,14 @@ bgp_rte_mergable(rte *pri, rte *sec)
u32 p, s;
/* Skip suppressed routes (see bgp_rte_recalculate()) */
if (pri->u.bgp.suppressed != sec->u.bgp.suppressed)
/* LLGR draft - depreference stale routes */
if (pri->pflags != sec->pflags)
return 0;
/* RFC 4271 9.1.2.1. Route resolvability test */
if (rte_resolvable(pri) != rte_resolvable(sec))
return 0;
/* LLGR draft - depreference stale routes */
if (rte_stale(pri) != rte_stale(sec))
return 0;
/* Start with local preferences */
x = ea_find(pri->attrs->eattrs, EA_CODE(PROTOCOL_BGP, BA_LOCAL_PREF));
y = ea_find(sec->attrs->eattrs, EA_CODE(PROTOCOL_BGP, BA_LOCAL_PREF));
@ -2141,7 +2148,7 @@ bgp_rte_recalculate(rtable *table, net *net, rte *new, rte *old, rte *old_best)
rte *key = new ? new : old;
u32 lpref = key->attrs->pref;
u32 lasn = bgp_get_neighbor(key);
int old_suppressed = old ? old->u.bgp.suppressed : 0;
int old_suppressed = old ? !!(old->pflags & BGP_REF_SUPPRESSED) : 0;
/*
* Proper RFC 4271 path selection is a bit complicated, it cannot be
@ -2193,11 +2200,11 @@ bgp_rte_recalculate(rtable *table, net *net, rte *new, rte *old, rte *old_best)
*/
if (new)
new->u.bgp.suppressed = 1;
new->pflags |= BGP_REF_SUPPRESSED;
if (old)
{
old->u.bgp.suppressed = 1;
old->pflags |= BGP_REF_SUPPRESSED;
/* The fast case - replace not best with worse (or remove not best) */
if (old_suppressed && !(new && bgp_rte_better(new, old)))
@ -2209,7 +2216,7 @@ bgp_rte_recalculate(rtable *table, net *net, rte *new, rte *old, rte *old_best)
for (s=net->routes; rte_is_valid(s); s=s->next)
if (use_deterministic_med(s) && same_group(s, lpref, lasn))
{
s->u.bgp.suppressed = 1;
s->pflags |= BGP_REF_SUPPRESSED;
if (!r || bgp_rte_better(s, r))
r = s;
}
@ -2220,16 +2227,16 @@ bgp_rte_recalculate(rtable *table, net *net, rte *new, rte *old, rte *old_best)
/* Found if new is mergable with best-in-group */
if (new && (new != r) && bgp_rte_mergable(r, new))
new->u.bgp.suppressed = 0;
new->pflags &= ~BGP_REF_SUPPRESSED;
/* Found all existing routes mergable with best-in-group */
for (s=net->routes; rte_is_valid(s); s=s->next)
if (use_deterministic_med(s) && same_group(s, lpref, lasn))
if ((s != r) && bgp_rte_mergable(r, s))
s->u.bgp.suppressed = 0;
s->pflags &= ~BGP_REF_SUPPRESSED;
/* Found best-in-group */
r->u.bgp.suppressed = 0;
r->pflags &= ~BGP_REF_SUPPRESSED;
/*
* There are generally two reasons why we have to force
@ -2277,7 +2284,7 @@ bgp_rte_modify_stale(struct rte *r, struct linpool *pool)
r = rte_cow_rta(r, pool);
bgp_set_attr_ptr(&(r->attrs->eattrs), pool, BA_COMMUNITY, flags,
int_set_add(pool, ad, BGP_COMM_LLGR_STALE));
r->u.bgp.stale = 1;
r->pflags |= BGP_REF_STALE;
return r;
}
@ -2364,7 +2371,7 @@ bgp_get_route_info(rte *e, byte *buf)
buf += bsprintf(buf, " (%d", e->attrs->pref);
if (e->u.bgp.suppressed)
if (e->pflags & BGP_REF_SUPPRESSED)
buf += bsprintf(buf, "-");
if (rte_stale(e))

4
proto/bgp/bgp.h
View file

@ -200,6 +200,10 @@ struct bgp_channel_config {
#define BGP_BFD_GRACEFUL 2 /* BFD down triggers graceful restart */
/* rte->pflags */
#define BGP_REF_SUPPRESSED 0x1 /* Used for deterministic MED comparison */
#define BGP_REF_STALE 0x2 /* Route is LLGR_STATE */
#define BGP_REF_NOT_STALE 0x4 /* Route is NOT LLGR_STATE */
struct bgp_af_caps {
u32 afi;

2
proto/bgp/packets.c
View file

@ -1366,8 +1366,6 @@ bgp_rte_update(struct bgp_parse_state *s, net_addr *n, u32 path_id, rta *a0)
rte *e = rte_get_temp(a, s->last_src);
e->pflags = 0;
e->u.bgp.suppressed = 0;
e->u.bgp.stale = -1;
rte_update3(&s->channel->c, n, e, s->last_src);
}

6
proto/pipe/pipe.c
View file

@ -43,6 +43,10 @@
#include "pipe.h"
#ifdef CONFIG_BGP
#include "proto/bgp/bgp.h"
#endif
static void
pipe_rt_notify(struct proto *P, struct channel *src_ch, net *n, rte *new, rte *old)
{
@ -82,7 +86,7 @@ pipe_rt_notify(struct proto *P, struct channel *src_ch, net *n, rte *new, rte *o
#ifdef CONFIG_BGP
/* Hack to cleanup cached value */
if (e->src->proto->proto == &proto_bgp)
e->u.bgp.stale = -1;
e->pflags &= ~(BGP_REF_STALE | BGP_REF_NOT_STALE);
#endif
}
else