summaryrefslogtreecommitdiffstats
path: root/nest
diff options
context:
space:
mode:
authorMartin Mares <mj@ucw.cz>1998-05-26 23:42:05 +0200
committerMartin Mares <mj@ucw.cz>1998-05-26 23:42:05 +0200
commit8a48ecb8b15e827f779d4b9fb080dff280b99872 (patch)
tree539024c093f36859ca9c9fae37add38ac9731feb /nest
parentb1487ee909ebd4cfc59f30d3678cb6667d4a72c8 (diff)
downloadbird-8a48ecb8b15e827f779d4b9fb080dff280b99872.tar
bird-8a48ecb8b15e827f779d4b9fb080dff280b99872.zip
Implemented scanning of network interfaces. Mostly very ugly code due to
terrible kernel interface (SIOGIFCONF and friends).
Diffstat (limited to 'nest')
-rw-r--r--nest/Makefile2
-rw-r--r--nest/iface.c177
-rw-r--r--nest/iface.h22
3 files changed, 199 insertions, 2 deletions
diff --git a/nest/Makefile b/nest/Makefile
index 0a9d5fe..aaa0c2a 100644
--- a/nest/Makefile
+++ b/nest/Makefile
@@ -1,4 +1,4 @@
THISDIR=nest
-OBJS=rt-table.o rt-fib.o rt-attr.o proto.o
+OBJS=rt-table.o rt-fib.o rt-attr.o proto.o iface.o
include ../Rules
diff --git a/nest/iface.c b/nest/iface.c
new file mode 100644
index 0000000..79a7b7d
--- /dev/null
+++ b/nest/iface.c
@@ -0,0 +1,177 @@
+/*
+ * BIRD -- Management of Interfaces
+ *
+ * (c) 1998 Martin Mares <mj@ucw.cz>
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include "nest/bird.h"
+#include "nest/iface.h"
+#include "lib/resource.h"
+
+list iface_list;
+
+static pool *if_pool;
+
+void
+if_dump(struct iface *i)
+{
+ struct ifa *a;
+
+ debug("IF%d: %s", i->index, i->name);
+ if (i->flags & IF_ADMIN_DOWN)
+ debug(" ADMIN-DOWN");
+ if (i->flags & IF_UP)
+ debug(" UP");
+ if (i->flags & IF_MULTIACCESS)
+ debug(" MA");
+ if (i->flags & IF_UNNUMBERED)
+ debug(" UNNUM");
+ if (i->flags & IF_BROADCAST)
+ debug(" BC");
+ if (i->flags & IF_MULTICAST)
+ debug(" MC");
+ if (i->flags & IF_TUNNEL)
+ debug(" TUNL");
+ if (i->flags & IF_LOOPBACK)
+ debug(" LOOP");
+ if (i->flags & IF_IGNORE)
+ debug(" IGN");
+ debug(" MTU=%d\n", i->mtu);
+ for(a=i->ifa; a; a=a->next)
+ debug("\t%08x, net %08x/%-2d bc %08x -> %08x\n", _I(a->ip), _I(a->prefix), a->pxlen, _I(a->brd), _I(a->opposite));
+}
+
+void
+if_dump_all(void)
+{
+ struct iface *i;
+
+ debug("Known network interfaces:\n\n");
+ WALK_LIST(i, iface_list)
+ if_dump(i);
+ debug("\n");
+}
+
+struct if_with_a {
+ struct iface i;
+ struct ifa a[0];
+};
+
+static struct iface *
+if_copy(struct iface *j)
+{
+ int len;
+ struct if_with_a *w;
+ struct iface *i;
+ struct ifa *a, **b, *c;
+
+ len = 0;
+ for(a=j->ifa; a; a=a->next)
+ len++;
+ w = mb_alloc(if_pool, sizeof(struct if_with_a) + len*sizeof(struct ifa));
+ i = &w->i;
+ c = w->a;
+ memcpy(i, j, sizeof(struct iface));
+ b = &i->ifa;
+ a = j->ifa;
+ while (a)
+ {
+ *b = c;
+ memcpy(c, a, sizeof(struct ifa));
+ b = &c->next;
+ a = a->next;
+ c++;
+ }
+ *b = NULL;
+ return i;
+}
+
+static inline void
+if_free(struct iface *i)
+{
+ mb_free(i);
+}
+
+static unsigned
+if_changed(struct iface *i, struct iface *j)
+{
+ unsigned f = 0;
+ struct ifa *x, *y;
+
+ x = i->ifa;
+ y = j->ifa;
+ while (x && y)
+ {
+ x = x->next;
+ y = y->next;
+ }
+ if (x || y)
+ f |= IF_CHANGE_ADDR;
+ if (i->mtu != j->mtu)
+ f |= IF_CHANGE_MTU;
+ if (i->flags != j->flags)
+ {
+ f |= IF_CHANGE_FLAGS;
+ if ((i->flags ^ j->flags) & IF_UP)
+ if (i->flags & IF_UP)
+ f |= IF_CHANGE_DOWN;
+ else
+ f |= IF_CHANGE_UP;
+ }
+ return f;
+}
+
+static void
+if_notify_change(unsigned c, struct iface *old, struct iface *new)
+{
+ debug("Interface change notification (%x) for %s\n", c, new->name);
+}
+
+void
+if_update(struct iface *new)
+{
+ struct iface *i;
+
+ WALK_LIST(i, iface_list)
+ if (!strcmp(new->name, i->name))
+ {
+ unsigned c = if_changed(i, new);
+ if (c)
+ {
+ struct iface *j = if_copy(new);
+ if_notify_change(c, i, j);
+ insert_node(&j->n, &i->n);
+ rem_node(&i->n);
+ if_free(i);
+ }
+ return;
+ }
+ i = if_copy(new);
+ add_tail(&iface_list, &i->n);
+ if_notify_change(IF_CHANGE_UP | IF_CHANGE_FLAGS | IF_CHANGE_MTU | IF_CHANGE_ADDR, NULL, i);
+}
+
+void
+if_end_update(void)
+{
+ struct iface *i, j;
+
+ WALK_LIST(i, iface_list)
+ if (i->flags & IF_UPDATED)
+ i->flags &= ~IF_UPDATED;
+ else
+ {
+ memcpy(&j, i, sizeof(struct iface));
+ i->flags = (i->flags & ~IF_UP) | IF_ADMIN_DOWN;
+ if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, &j, i);
+ }
+}
+
+void
+if_init(void)
+{
+ if_pool = rp_new(&root_pool, "Interfaces");
+ init_list(&iface_list);
+}
diff --git a/nest/iface.h b/nest/iface.h
index 454c050..4df9873 100644
--- a/nest/iface.h
+++ b/nest/iface.h
@@ -11,9 +11,11 @@
#include "lib/lists.h"
+extern list iface_list;
+
struct iface {
node n;
- char *name;
+ char name[16];
unsigned flags;
unsigned mtu;
struct ifa *ifa; /* First address is primary */
@@ -26,6 +28,10 @@ struct iface {
#define IF_BROADCAST 8
#define IF_MULTICAST 16
#define IF_TUNNEL 32
+#define IF_ADMIN_DOWN 64
+#define IF_LOOPBACK 128
+#define IF_IGNORE 256
+#define IF_UPDATED 0x1000 /* Touched in last scan */
/* Interface address */
@@ -39,4 +45,18 @@ struct ifa {
struct neighbor *neigh; /* List of neighbors on this interface */
};
+/* Interface change events */
+
+#define IF_CHANGE_UP 1
+#define IF_CHANGE_DOWN 2
+#define IF_CHANGE_FLAGS 4
+#define IF_CHANGE_MTU 8
+#define IF_CHANGE_ADDR 16
+
+void if_init(void);
+void if_dump(struct iface *);
+void if_dump_all(void);
+void if_update(struct iface *);
+void if_end_update(void);
+
#endif