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-rw-r--r--nest/route.h5
-rw-r--r--nest/rt-attr.c2
-rw-r--r--nest/rt-table.c60
-rw-r--r--proto/bgp/attrs.c22
-rw-r--r--proto/bgp/bgp.h1
-rw-r--r--proto/bgp/config.Y2
-rw-r--r--proto/bgp/packets.c1
7 files changed, 82 insertions, 11 deletions
diff --git a/nest/route.h b/nest/route.h
index 4dd4375..d062e60 100644
--- a/nest/route.h
+++ b/nest/route.h
@@ -173,6 +173,7 @@ struct hostentry {
struct iface *iface; /* Chosen outgoing interface */
ip_addr gw; /* Chosen next hop */
byte dest; /* Chosen route destination type (RTD_...) */
+ u32 igp_metric; /* Chosen route IGP metric */
};
typedef struct rte {
@@ -276,6 +277,7 @@ typedef struct rta {
byte flags; /* Route flags (RTF_...), now unused */
byte aflags; /* Attribute cache flags (RTAF_...) */
u16 hash_key; /* Hash over important fields */
+ u32 igp_metric; /* IGP metric to next hop (for iBGP routes) */
ip_addr gw; /* Next hop */
ip_addr from; /* Advertising router */
struct hostentry *hostentry; /* Hostentry for recursive next-hops */
@@ -311,6 +313,9 @@ typedef struct rta {
#define RTAF_CACHED 1 /* This is a cached rta */
+#define IGP_METRIC_UNKNOWN 0x80000000 /* Default igp_metric used when no other
+ protocol-specific metric is availabe */
+
/*
* Extended Route Attributes
*/
diff --git a/nest/rt-attr.c b/nest/rt-attr.c
index 9caee8d..d714818 100644
--- a/nest/rt-attr.c
+++ b/nest/rt-attr.c
@@ -584,9 +584,11 @@ rta_same(rta *x, rta *y)
x->cast == y->cast &&
x->dest == y->dest &&
x->flags == y->flags &&
+ x->igp_metric == y->igp_metric &&
ipa_equal(x->gw, y->gw) &&
ipa_equal(x->from, y->from) &&
x->iface == y->iface &&
+ x->hostentry == y->hostentry &&
ea_same(x->eattrs, y->eattrs));
}
diff --git a/nest/rt-table.c b/nest/rt-table.c
index 1f84e97..b73f52f 100644
--- a/nest/rt-table.c
+++ b/nest/rt-table.c
@@ -59,6 +59,24 @@ static void rt_prune(rtable *tab);
static inline void rt_schedule_gc(rtable *tab);
+/* Like fib_route(), but skips empty net entries */
+static net *
+net_route(rtable *tab, ip_addr a, int len)
+{
+ ip_addr a0;
+ net *n;
+
+ while (len >= 0)
+ {
+ a0 = ipa_and(a, ipa_mkmask(len));
+ n = fib_find(&tab->fib, &a0, len);
+ if (n && n->routes)
+ return n;
+ len--;
+ }
+ return NULL;
+}
+
static void
rte_init(struct fib_node *N)
{
@@ -945,16 +963,18 @@ rt_preconfig(struct config *c)
*/
static inline int
-hostentry_diff(struct hostentry *he, struct iface *iface, ip_addr gw, byte dest)
+hostentry_diff(struct hostentry *he, struct iface *iface, ip_addr gw,
+ byte dest, u32 igp_metric)
{
- return (he->iface != iface) || !ipa_equal(he->gw, gw) || (he->dest != dest);
+ return (he->iface != iface) || !ipa_equal(he->gw, gw) ||
+ (he->dest != dest) || (he->igp_metric != igp_metric);
}
static inline int
rta_next_hop_outdated(rta *a)
{
struct hostentry *he = a->hostentry;
- return he && hostentry_diff(he, a->iface, a->gw, a->dest);
+ return he && hostentry_diff(he, a->iface, a->gw, a->dest, a->igp_metric);
}
static inline void
@@ -964,6 +984,7 @@ rta_apply_hostentry(rta *a, struct hostentry *he)
a->iface = he->iface;
a->gw = he->gw;
a->dest = he->dest;
+ a->igp_metric = he->igp_metric;
}
static inline rte *
@@ -1449,16 +1470,36 @@ if_local_addr(ip_addr a, struct iface *i)
return 0;
}
+static u32
+rt_get_igp_metric(rte *rt)
+{
+ rta *a = rt->attrs;
+ if ((a->source == RTS_OSPF) ||
+ (a->source == RTS_OSPF_IA) ||
+ (a->source == RTS_OSPF_EXT1))
+ return rt->u.ospf.metric1;
+
+ if (a->source == RTS_RIP)
+ return rt->u.rip.metric;
+
+ /* Device routes */
+ if (a->dest != RTD_ROUTER)
+ return 0;
+
+ return IGP_METRIC_UNKNOWN;
+}
+
static int
rt_update_hostentry(rtable *tab, struct hostentry *he)
{
struct iface *old_iface = he->iface;
ip_addr old_gw = he->gw;
byte old_dest = he->dest;
+ u32 old_metric = he->igp_metric;
int pxlen = 0;
- net *n = fib_route(&tab->fib, he->addr, MAX_PREFIX_LENGTH);
- if (n && n->routes)
+ net *n = net_route(tab, he->addr, MAX_PREFIX_LENGTH);
+ if (n)
{
rta *a = n->routes->attrs;
pxlen = n->n.pxlen;
@@ -1489,6 +1530,8 @@ rt_update_hostentry(rtable *tab, struct hostentry *he)
he->gw = a->gw;
he->dest = a->dest;
}
+
+ he->igp_metric = he->iface ? rt_get_igp_metric(n->routes) : 0;
}
else
{
@@ -1496,12 +1539,13 @@ rt_update_hostentry(rtable *tab, struct hostentry *he)
he->iface = NULL;
he->gw = IPA_NONE;
he->dest = RTD_UNREACHABLE;
+ he->igp_metric = 0;
}
/* Add a prefix range to the trie */
trie_add_prefix(tab->hostcache->trie, he->addr, MAX_PREFIX_LENGTH, pxlen, MAX_PREFIX_LENGTH);
- return hostentry_diff(he, old_iface, old_gw, old_dest);
+ return hostentry_diff(he, old_iface, old_gw, old_dest, old_metric);
}
static void
@@ -1730,9 +1774,9 @@ rt_show(struct rt_show_data *d)
else
{
if (d->show_for)
- n = fib_route(&d->table->fib, d->prefix, d->pxlen);
+ n = net_route(d->table, d->prefix, d->pxlen);
else
- n = fib_find(&d->table->fib, &d->prefix, d->pxlen);
+ n = net_find(d->table, d->prefix, d->pxlen);
if (n)
{
rt_show_net(this_cli, n, d);
diff --git a/proto/bgp/attrs.c b/proto/bgp/attrs.c
index 3e7c94a..ef5d024 100644
--- a/proto/bgp/attrs.c
+++ b/proto/bgp/attrs.c
@@ -1084,8 +1084,13 @@ bgp_rte_better(rte *new, rte *old)
if (new_bgp->is_internal < old_bgp->is_internal)
return 1;
- /* Skipping RFC 4271 9.1.2.2. e) */
- /* We don't have interior distances */
+ /* RFC 4271 9.1.2.2. e) Compare IGP metrics */
+ n = new_bgp->cf->igp_metric ? new->attrs->igp_metric : 0;
+ o = old_bgp->cf->igp_metric ? old->attrs->igp_metric : 0;
+ if (n < o)
+ return 1;
+ if (n > o)
+ return 0;
/* RFC 4271 9.1.2.2. f) Compare BGP identifiers */
/* RFC 4456 9. a) Use ORIGINATOR_ID instead of local neighor ID */
@@ -1494,7 +1499,18 @@ bgp_get_route_info(rte *e, byte *buf, ea_list *attrs)
eattr *o = ea_find(attrs, EA_CODE(EAP_BGP, BA_ORIGIN));
u32 origas;
- buf += bsprintf(buf, " (%d) [", e->pref);
+ buf += bsprintf(buf, " (%d", e->pref);
+ if (e->attrs->hostentry)
+ {
+ if (!e->attrs->iface)
+ buf += bsprintf(buf, "/-");
+ else if (e->attrs->igp_metric >= IGP_METRIC_UNKNOWN)
+ buf += bsprintf(buf, "/?");
+ else
+ buf += bsprintf(buf, "/%d", e->attrs->igp_metric);
+ }
+ buf += bsprintf(buf, ") [");
+
if (p && as_path_get_last(p->u.ptr, &origas))
buf += bsprintf(buf, "AS%u", origas);
if (o)
diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h
index 6bb1d6e..b06f20a 100644
--- a/proto/bgp/bgp.h
+++ b/proto/bgp/bgp.h
@@ -25,6 +25,7 @@ struct bgp_config {
int missing_lladdr; /* What we will do when we don' know link-local addr, see MLL_* */
int gw_mode; /* How we compute route gateway from next_hop attr, see GW_* */
int compare_path_lengths; /* Use path lengths when selecting best route */
+ int igp_metric; /* Use IGP metrics when selecting best route */
int prefer_older; /* Prefer older routes according to RFC 5004 */
u32 default_local_pref; /* Default value for LOCAL_PREF attribute */
u32 default_med; /* Default value for MULTI_EXIT_DISC attribute */
diff --git a/proto/bgp/config.Y b/proto/bgp/config.Y
index 75b9339..e932a7f 100644
--- a/proto/bgp/config.Y
+++ b/proto/bgp/config.Y
@@ -38,6 +38,7 @@ bgp_proto_start: proto_start BGP {
BGP_CFG->connect_retry_time = 120;
BGP_CFG->initial_hold_time = 240;
BGP_CFG->compare_path_lengths = 1;
+ BGP_CFG->igp_metric = 1;
BGP_CFG->start_delay_time = 5;
BGP_CFG->error_amnesia_time = 300;
BGP_CFG->error_delay_time_min = 60;
@@ -78,6 +79,7 @@ bgp_proto:
| bgp_proto GATEWAY DIRECT ';' { BGP_CFG->gw_mode = GW_DIRECT; }
| bgp_proto GATEWAY RECURSIVE ';' { BGP_CFG->gw_mode = GW_RECURSIVE; }
| bgp_proto PATH METRIC bool ';' { BGP_CFG->compare_path_lengths = $4; }
+ | bgp_proto IGP METRIC bool ';' { BGP_CFG->igp_metric = $4; }
| bgp_proto PREFER OLDER bool ';' { BGP_CFG->prefer_older = $4; }
| bgp_proto DEFAULT BGP_MED expr ';' { BGP_CFG->default_med = $4; }
| bgp_proto DEFAULT BGP_LOCAL_PREF expr ';' { BGP_CFG->default_local_pref = $4; }
diff --git a/proto/bgp/packets.c b/proto/bgp/packets.c
index 632c564..29d23b9 100644
--- a/proto/bgp/packets.c
+++ b/proto/bgp/packets.c
@@ -823,6 +823,7 @@ bgp_set_next_hop(struct bgp_proto *p, rta *a)
a->gw = ng->addr;
a->iface = ng->iface;
a->hostentry = NULL;
+ a->igp_metric = 0;
}
else /* GW_RECURSIVE */
rta_set_recursive_next_hop(p->p.table, a, p->igp_table, nexthop, nexthop + second);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 01:00:04 +0100