Hopefully finished kernel syncer (krt) rewrite:

  o  Interface syncing is now a part of krt and it can have configurable
     parameters. Actually, the only one is scan rate now :)
  o  Kernel routing table syncing is now synchronized with interface
     syncing (we need the most recent version of the interface list
     to prevent lots of routes to non-existent destinations from
     appearing). Instead of its own timer, we just check if it's
     route scan time after each iface list scan.
  o  Syncing of device routes implemented.
  o  CONFIG_AUTO_ROUTES should control syncing of automatic device routes.
  o  Rewrote krt_remove_route() to really remove routes :)
  o  Better diagnostics.
  o  Fixed a couple of bugs.

7 files changed, 133 insertions, 39 deletions

diff --git a/sysdep/unix/Modules b/sysdep/unix/Modules
index 441c3f07..f6db6d35 100644
--- a/sysdep/unix/Modules
+++ b/sysdep/unix/Modules
@@ -9,3 +9,5 @@ krt.Y
 krt.h
 krt-set.c
 krt-set.h
+krt-iface.h
+krt-iface.Y
diff --git a/sysdep/unix/krt-iface.Y b/sysdep/unix/krt-iface.Y
new file mode 100644
index 00000000..becb70cf
--- /dev/null
+++ b/sysdep/unix/krt-iface.Y
@@ -0,0 +1,30 @@
+/*
+ *	BIRD -- UNIX Interface Syncer Configuration
+ *
+ *	(c) 1998 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+CF_HDR
+
+#include "lib/krt-scan.h"
+
+CF_DECLS
+
+CF_KEYWORDS(LEARN, ROUTE, SCAN, TIME)
+
+CF_GRAMMAR
+
+CF_ADDTO(kern_proto, kern_proto krt_if_item ';')
+
+krt_if_item:
+   SCAN TIME expr {
+      /* Scan time of 0 means scan on startup only */
+      ((struct krt_proto *) this_proto)->ifopt.scan_time = $3;
+   }
+ ;
+
+CF_CODE
+
+CF_END
diff --git a/sysdep/unix/krt-iface.h b/sysdep/unix/krt-iface.h
new file mode 100644
index 00000000..95cfff8c
--- /dev/null
+++ b/sysdep/unix/krt-iface.h
@@ -0,0 +1,16 @@
+/*
+ *	BIRD -- Unix Kernel Interface Syncer -- Setting Parameters
+ *
+ *	(c) 1998 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_KRT_IFACE_H_
+#define _BIRD_KRT_IFACE_H_
+
+struct krt_if_params {
+  int scan_time;
+};
+
+#endif
diff --git a/sysdep/unix/krt-set.c b/sysdep/unix/krt-set.c
index 8bc2df11..33d5bca0 100644
--- a/sysdep/unix/krt-set.c
+++ b/sysdep/unix/krt-set.c
@@ -29,9 +29,7 @@ krt_capable(rte *e)
   return
     a->cast == RTC_UNICAST &&
     (a->dest == RTD_ROUTER
-#ifndef CONFIG_AUTO_ROUTES
      || a->dest == RTD_DEVICE
-#endif
 #ifdef RTF_REJECT
      || a->dest == RTD_UNREACHABLE
 #endif
@@ -39,38 +37,25 @@ krt_capable(rte *e)
     !a->tos;
 }
 
-void
-krt_remove_route(rte *old)
+static inline int
+krt_capable_op(rte *e)
 {
-  net *net = old->net;
-  struct rtentry re;
+  rta *a = e->attrs;
 
-  if (!krt_capable(old) || old->attrs->source == RTS_INHERIT)
-    {
-      DBG("krt_remove_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
-      return;
-    }
-  DBG("krt_remove_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
-  bzero(&re, sizeof(re));
-  fill_in_sockaddr((struct sockaddr_in *) &re.rt_dst, net->n.prefix, 0);
-  fill_in_sockaddr((struct sockaddr_in *) &re.rt_genmask, ipa_mkmask(net->n.pxlen), 0);
-  if (ioctl(if_scan_sock, SIOCDELRT, &re) < 0)
-    log(L_ERR "SIOCDELRT(%I/%d): %m", net->n.prefix, net->n.pxlen);
+#ifdef CONFIG_AUTO_ROUTES
+  if (a->dest == RTD_ROUTER && a->source == RTS_DEVICE)
+    return 0;
+#endif
+  return krt_capable(e);
 }
 
-void
-krt_add_route(rte *new)
+static void
+krt_ioctl(int ioc, rte *e, char *name)
 {
-  net *net = new->net;
+  net *net = e->net;
   struct rtentry re;
-  rta *a = new->attrs;
+  rta *a = e->attrs;
 
-  if (!krt_capable(new) || new->attrs->source == RTS_INHERIT)
-    {
-      DBG("krt_add_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
-      return;
-    }
-  DBG("krt_add_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
   bzero(&re, sizeof(re));
   fill_in_sockaddr((struct sockaddr_in *) &re.rt_dst, net->n.prefix, 0);
   fill_in_sockaddr((struct sockaddr_in *) &re.rt_genmask, ipa_mkmask(net->n.pxlen), 0);
@@ -83,11 +68,9 @@ krt_add_route(rte *new)
       fill_in_sockaddr((struct sockaddr_in *) &re.rt_gateway, a->gw, 0);
       re.rt_flags |= RTF_GATEWAY;
       break;
-#ifndef CONFIG_AUTO_ROUTES
     case RTD_DEVICE:
       re.rt_dev = a->iface->name;
       break;
-#endif
 #ifdef RTF_REJECT
     case RTD_UNREACHABLE:
       re.rt_flags |= RTF_REJECT;
@@ -97,8 +80,36 @@ krt_add_route(rte *new)
       die("krt set: unknown flags, but not filtered");
     }
 
-  if (ioctl(if_scan_sock, SIOCADDRT, &re) < 0)
-    log(L_ERR "SIOCADDRT(%I/%d): %m", net->n.prefix, net->n.pxlen);
+  if (ioctl(if_scan_sock, ioc, &re) < 0)
+    log(L_ERR "%s(%I/%d): %m", name, net->n.prefix, net->n.pxlen);
+}
+
+void
+krt_remove_route(rte *old)
+{
+  net *net = old->net;
+
+  if (!krt_capable_op(old))
+    {
+      DBG("krt_remove_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
+      return;
+    }
+  DBG("krt_remove_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
+  krt_ioctl(SIOCDELRT, old, "SIOCDELRT");
+}
+
+void
+krt_add_route(rte *new)
+{
+  net *net = new->net;
+
+  if (!krt_capable_op(new))
+    {
+      DBG("krt_add_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
+      return;
+    }
+  DBG("krt_add_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
+  krt_ioctl(SIOCADDRT, new, "SIOCADDRT");
 }
 
 void
@@ -119,4 +130,3 @@ krt_set_preconfig(struct krt_proto *x)
     die("krt set: missing socket");
   x->p.rt_notify = krt_set_notify;
 }
-
diff --git a/sysdep/unix/krt.h b/sysdep/unix/krt.h
index aae5bd57..4ea88d50 100644
--- a/sysdep/unix/krt.h
+++ b/sysdep/unix/krt.h
@@ -11,6 +11,7 @@
 
 #include "lib/krt-scan.h"
 #include "lib/krt-set.h"
+#include "lib/krt-iface.h"
 
 /* Flags stored in net->n.flags */
 
@@ -28,6 +29,7 @@ struct krt_proto {
   struct proto p;
   struct krt_set_params setopt;
   struct krt_scan_params scanopt;
+  struct krt_if_params ifopt;
 };
 
 extern struct proto *cf_krt_proto;
@@ -37,9 +39,16 @@ extern struct proto *cf_krt_proto;
 void krt_scan_preconfig(struct krt_proto *);
 void krt_scan_start(struct krt_proto *);
 void krt_scan_shutdown(struct krt_proto *);
+void krt_scan_ifaces_done(struct krt_proto *);
 
 /* krt-set.c */
 
 void krt_set_preconfig(struct krt_proto *);
 
+/* sync-if.c */
+
+void krt_if_preconfig(struct krt_proto *);
+void krt_if_start(struct krt_proto *);
+void krt_if_shutdown(struct krt_proto *);
+
 #endif
diff --git a/sysdep/unix/sync-if.c b/sysdep/unix/sync-if.c
index 76426e73..70a2c0ce 100644
--- a/sysdep/unix/sync-if.c
+++ b/sysdep/unix/sync-if.c
@@ -17,12 +17,14 @@
 
 #include "nest/bird.h"
 #include "nest/iface.h"
+#include "nest/route.h"
+#include "nest/protocol.h"
 #include "lib/timer.h"
+#include "lib/krt.h"
 
 #include "unix.h"
 
 int if_scan_sock;
-int if_scan_period = 60;
 
 static timer *if_scan_timer;
 
@@ -131,8 +133,9 @@ scan_if(timer *t)
   struct ifconf ic;
   static int last_ifbuf_size = 4*sizeof(struct ifreq);
   int res;
+  struct krt_proto *p = t->data;
 
-  DBG("Scanning interfaces...\n");
+  DBG("It's interface scan time...\n");
   for(;;)
     {
       if (last_ifbuf_size)
@@ -165,6 +168,32 @@ scan_if(timer *t)
       DBG("Increased ifconf buffer size to %d\n", last_ifbuf_size);
 #endif
     }
+  krt_scan_ifaces_done(p);
+}
+
+void
+krt_if_start(struct krt_proto *p)
+{
+  if_scan_timer = tm_new(&root_pool);
+  if_scan_timer->hook = scan_if;
+  if_scan_timer->data = p;
+  if_scan_timer->recurrent = p->ifopt.scan_time;
+  scan_if(if_scan_timer);
+  tm_start(if_scan_timer, p->ifopt.scan_time);
+}
+
+void
+krt_if_preconfig(struct krt_proto *p)
+{
+  p->ifopt.scan_time = 60;
+}
+
+void
+krt_if_shutdown(struct krt_proto *p)
+{
+  tm_stop(if_scan_timer);
+  rfree(if_scan_timer);
+  /* FIXME: What should we do with interfaces? */
 }
 
 void
@@ -174,9 +203,4 @@ scan_if_init(void)
   DBG("Using socket %d for interface and route scanning\n", if_scan_sock);
   if (if_scan_sock < 0)
     die("Cannot create scanning socket: %m");
-  scan_if(NULL);
-  if_scan_timer = tm_new(&root_pool);
-  if_scan_timer->hook = scan_if;
-  if_scan_timer->recurrent = if_scan_period;
-  tm_start(if_scan_timer, if_scan_period);
 }
diff --git a/sysdep/unix/sync-rt.c b/sysdep/unix/sync-rt.c
index 169494e2..dc79118d 100644
--- a/sysdep/unix/sync-rt.c
+++ b/sysdep/unix/sync-rt.c
@@ -30,6 +30,7 @@ krt_start(struct proto *P)
 {
   struct krt_proto *p = (struct krt_proto *) P;
   krt_scan_start(p);
+  krt_if_start(p);
 }
 
 void
@@ -37,6 +38,7 @@ krt_shutdown(struct proto *P, int time)
 {
   struct krt_proto *p = (struct krt_proto *) P;
   krt_scan_shutdown(p);
+  krt_if_shutdown(p);
 }
 
 void
@@ -50,6 +52,7 @@ krt_preconfig(struct protocol *x)
   p->p.shutdown = krt_shutdown;
   krt_scan_preconfig(p);
   krt_set_preconfig(p);
+  krt_if_preconfig(p);
 }
 
 struct protocol proto_unix_kernel = {