table).
<p>Note that routes created by OS kernel itself, namely direct routes
-representing IP subnets of associated interfaces, are not imported even with
-<cf/learn/ enabled. You can use <ref id="direct" name="Direct protocol"> to
-generate these direct routes.
+representing IP subnets of associated interfaces, are imported only with
+<cf/learn all/ enabled.
<p>If your OS supports only a single routing table, you can configure only one
instance of the Kernel protocol. If it supports multiple tables (in order to
Time in seconds between two consecutive scans of the kernel routing
table.
- <tag><label id="krt-learn">learn <m/switch/</tag>
+ <tag><label id="krt-learn">learn <m/switch/|all</tag>
Enable learning of routes added to the kernel routing tables by other
routing daemons or by the system administrator. This is possible only on
- systems which support identification of route authorship.
+ systems which support identification of route authorship. By default,
+ routes created by kernel (marked as "proto kernel") are not imported.
+ Use <cf/learn all/ option to import even these routes.
<tag><label id="krt-kernel-table">kernel table <m/number/</tag>
Select which kernel table should this particular instance of the Kernel
case RTPROT_KERNEL:
krt_src = KRT_SRC_KERNEL;
- return;
+ break;
case RTPROT_BIRD:
if (!s->scan)
CF_KEYWORDS(KERNEL, PERSIST, SCAN, TIME, LEARN, DEVICE, ROUTES, GRACEFUL, RESTART, KRT_SOURCE, KRT_METRIC, MERGE, PATHS)
CF_KEYWORDS(INTERFACE, PREFERRED)
+%type <i> kern_learn
%type <i> kern_mp_limit
%type <cc> kern_channel
kern_proto: kern_proto_start proto_name '{' ;
kern_proto: kern_proto kern_item ';' ;
+kern_learn:
+ bool { $$ = $1 ? KRT_LEARN_ALIEN : KRT_LEARN_NONE; }
+ | ALL { $$ = KRT_LEARN_ALL; }
+ ;
+
kern_mp_limit:
/* empty */ { $$ = KRT_DEFAULT_ECMP_LIMIT; }
| LIMIT expr { $$ = $2; if (($2 <= 0) || ($2 > 255)) cf_error("Merge paths limit must be in range 1-255"); }
/* Scan time of 0 means scan on startup only */
THIS_KRT->scan_time = $3 S_;
}
- | LEARN bool {
+ | LEARN kern_learn {
THIS_KRT->learn = $2;
#ifndef KRT_ALLOW_LEARN
if ($2)
#ifdef KRT_ALLOW_LEARN
switch (src)
{
- case KRT_SRC_KERNEL:
- goto ignore;
-
case KRT_SRC_REDIRECT:
goto delete;
+ case KRT_SRC_KERNEL:
+ if (KRT_CF->learn != KRT_LEARN_ALL)
+ goto ignore;
+ /* fallthrough */
+
case KRT_SRC_ALIEN:
if (KRT_CF->learn)
krt_learn_scan(p, e);
break;
#ifdef KRT_ALLOW_LEARN
+ case KRT_SRC_KERNEL:
+ if (KRT_CF->learn != KRT_LEARN_ALL)
+ break;
+ /* fallthrough */
+
case KRT_SRC_ALIEN:
if (KRT_CF->learn)
{
#define KRT_REF_SEEN 0x1 /* Seen in table */
#define KRT_REF_BEST 0x2 /* Best in table */
+#define KRT_LEARN_NONE 0 /* Do not learn */
+#define KRT_LEARN_ALIEN 1 /* Learn KRT_SRC_ALIEN routes */
+#define KRT_LEARN_ALL 2 /* Learn both KRT_SRC_ALIEN and KRT_SRC_KERNEL routes */
+
/* Whenever we recognize our own routes, we allow learing of foreign routes */
#ifdef CONFIG_SELF_CONSCIOUS