protocol work with. Available only on systems supporting multiple
routing tables.
+ <tag>metric <m/number/</tag> (Linux)
+ Use specified value as a kernel metric (priority) for all routes sent to
+ the kernel. When multiple routes for the same network are in the kernel
+ routing table, the Linux kernel chooses one with lower metric. Also,
+ routes with different metrics do not clash with each other, therefore
+ using dedicated metric value is a reliable way to avoid overwriting
+ routes from other sources (e.g. kernel device routes). Metric 0 has a
+ special meaning of undefined metric, in which either OS default is used,
+ or per-route metric can be set using <cf/krt_metric/ attribute. Default:
+ 0 (undefined).
+
<tag>graceful restart <m/switch/</tag>
Participate in graceful restart recovery. If this option is enabled and
a graceful restart recovery is active, the Kernel protocol will defer
route. See /etc/iproute2/rt_protos for common values. On BSD, it is
based on STATIC and PROTOx flags. The attribute is read-only.
- <tag>int <cf/krt_metric/</tag>
+ <tag>int <cf/krt_metric/</tag> (Linux)
The kernel metric of the route. When multiple same routes are in a
kernel routing table, the Linux kernel chooses one with lower metric.
+ Note that preferred way to set kernel metric is to use protocol option
+ <cf/metric/, unless per-route metric values are needed.
<tag>ip <cf/krt_prefsrc/</tag> (Linux)
The preferred source address. Used in source address selection for
struct krt_params {
u32 table_id; /* Kernel table ID we sync with */
+ u32 metric; /* Kernel metric used for all routes */
};
struct krt_state {
CF_DECLS
-CF_KEYWORDS(KERNEL, TABLE, KRT_PREFSRC, KRT_REALM, KRT_MTU, KRT_WINDOW, KRT_RTT,
- KRT_RTTVAR, KRT_SSTRESH, KRT_CWND, KRT_ADVMSS, KRT_REORDERING,
+CF_KEYWORDS(KERNEL, TABLE, METRIC, KRT_PREFSRC, KRT_REALM, KRT_MTU, KRT_WINDOW,
+ KRT_RTT, KRT_RTTVAR, KRT_SSTRESH, KRT_CWND, KRT_ADVMSS, KRT_REORDERING,
KRT_HOPLIMIT, KRT_INITCWND, KRT_RTO_MIN, KRT_INITRWND, KRT_QUICKACK,
KRT_LOCK_MTU, KRT_LOCK_WINDOW, KRT_LOCK_RTT, KRT_LOCK_RTTVAR,
KRT_LOCK_SSTRESH, KRT_LOCK_CWND, KRT_LOCK_ADVMSS, KRT_LOCK_REORDERING,
CF_ADDTO(kern_proto, kern_proto kern_sys_item ';')
kern_sys_item:
- KERNEL TABLE expr {
- THIS_KRT->sys.table_id = $3;
- }
+ KERNEL TABLE expr { THIS_KRT->sys.table_id = $3; }
+ | METRIC expr { THIS_KRT->sys.metric = $2; }
;
CF_ADDTO(dynamic_attr, KRT_PREFSRC { $$ = f_new_dynamic_attr(EAF_TYPE_IP_ADDRESS, T_IP, EA_KRT_PREFSRC); })
eattr *ea;
net *net = e->net;
rta *a = e->attrs;
+ u32 priority = 0;
+
struct {
struct nlmsghdr h;
struct rtmsg r;
else
nl_add_attr_u32(&r.h, sizeof(r), RTA_TABLE, krt_table_id(p));
+ if (a->source == RTS_DUMMY)
+ priority = e->u.krt.metric;
+ else if (KRT_CF->sys.metric)
+ priority = KRT_CF->sys.metric;
+ else if ((op != NL_OP_DELETE) && (ea = ea_find(eattrs, EA_KRT_METRIC)))
+ priority = ea->u.data;
+
+ if (priority)
+ nl_add_attr_u32(&r.h, sizeof(r), RTA_PRIORITY, priority);
+
/* For route delete, we do not specify remaining route attributes */
if (op == NL_OP_DELETE)
goto dest;
- if (ea = ea_find(eattrs, EA_KRT_METRIC))
- nl_add_attr_u32(&r.h, sizeof(r), RTA_PRIORITY, ea->u.data);
-
if (ea = ea_find(eattrs, EA_KRT_PREFSRC))
nl_add_attr_ipa(&r.h, sizeof(r), RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data);
int
krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o)
{
- return n->sys.table_id == o->sys.table_id;
+ return (n->sys.table_id == o->sys.table_id) && (n->sys.metric == o->sys.metric);
}
void
krt_sys_init_config(struct krt_config *cf)
{
cf->sys.table_id = RT_TABLE_MAIN;
+ cf->sys.metric = 0;
}
void
krt_sys_copy_config(struct krt_config *d, struct krt_config *s)
{
d->sys.table_id = s->sys.table_id;
+ d->sys.metric = s->sys.metric;
}
static const char *krt_metrics_names[KRT_METRICS_MAX] = {