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-rw-r--r--sysdep/linux/krt-scan.c132
1 files changed, 131 insertions, 1 deletions
diff --git a/sysdep/linux/krt-scan.c b/sysdep/linux/krt-scan.c
index caae54d..efc8e93 100644
--- a/sysdep/linux/krt-scan.c
+++ b/sysdep/linux/krt-scan.c
@@ -7,23 +7,153 @@
*/
#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <net/route.h>
#define LOCAL_DEBUG
#include "nest/bird.h"
-#include "nest/iface.h"
#include "nest/route.h"
#include "nest/protocol.h"
+#include "nest/iface.h"
#include "lib/timer.h"
#include "lib/unix.h"
#include "lib/krt.h"
#define SCANOPT struct krt_scan_params *p = &x->scanopt
+static int krt_scan_fd = -1;
+
+static void
+krt_parse_entry(byte *e)
+{
+ u32 dest0, gw0, mask0;
+ ip_addr dest, gw, mask;
+ unsigned int flags;
+ int masklen;
+ net *net;
+ byte *iface = e;
+
+ if (sscanf(e, "%*s\t%x\t%x\t%x\t%*d\t%*d\t%*d\t%x\t", &dest0, &gw0, &flags, &mask0) != 4)
+ {
+ log(L_ERR "krt read: unable to parse `%s'", e);
+ return;
+ }
+ while (*e != '\t')
+ e++;
+ *e = 0;
+
+ dest = ipa_from_u32(dest0);
+ ipa_ntoh(dest);
+ gw = ipa_from_u32(gw0);
+ ipa_ntoh(gw);
+ mask = ipa_from_u32(mask0);
+ ipa_ntoh(mask);
+ if ((masklen = ipa_mklen(mask)) < 0)
+ {
+ log(L_ERR "krt read: invalid netmask %08x", mask0);
+ return;
+ }
+ DBG("Got %I/%d via %I flags %x\n", dest, masklen, gw, flags);
+
+ if (!(flags & RTF_UP))
+ return;
+ if (flags & RTF_HOST)
+ masklen = 32;
+ if (flags & (RTF_DYNAMIC | RTF_MODIFIED)) /* Redirect route */
+ {
+ log(L_WARN "krt: Ignoring redirect to %I/%d via %I", dest, masklen, gw);
+ return;
+ }
+ net = net_get(&master_table, 0, dest, masklen);
+ if (net->routes)
+ {
+ rte *e = net->routes;
+ rta *a = e->attrs;
+ int ok;
+ switch (a->dest)
+ {
+ case RTD_ROUTER:
+ ok = (flags & RTF_GATEWAY) && ipa_equal(gw, a->gw);
+ break;
+ case RTD_DEVICE:
+#ifdef CONFIG_AUTO_ROUTES
+ ok = 1;
+#else
+ ok = !(flags & RTF_GATEWAY) && !strcmp(iface, a->iface->name);
+#endif
+ break;
+ case RTD_UNREACHABLE:
+ ok = flags & RTF_REJECT;
+ default:
+ ok = 0;
+ }
+ net->n.flags |= ok ? KRF_SEEN : KRF_UPDATE;
+ }
+ else
+ {
+#ifdef CONFIG_AUTO_ROUTES
+ if (!(flags & RTF_GATEWAY)) /* It's a device route */
+ return;
+#endif
+ net->n.flags |= KRF_UPDATE;
+ }
+}
+
+static int
+krt_scan_proc(void)
+{
+ byte buf[32768];
+ int l, seen_hdr;
+
+ if (krt_scan_fd < 0)
+ {
+ krt_scan_fd = open("/proc/net/route", O_RDONLY);
+ if (krt_scan_fd < 0)
+ die("/proc/net/route: %m");
+ }
+ else if (lseek(krt_scan_fd, 0, SEEK_SET) < 0)
+ {
+ log(L_ERR "krt seek: %m");
+ return 0;
+ }
+ seen_hdr = 0;
+ while ((l = read(krt_scan_fd, buf, sizeof(buf))) > 0)
+ {
+ byte *z = buf;
+ if (l & 127)
+ {
+ log(L_ERR "krt read: misaligned entry: l=%d", l);
+ return 0;
+ }
+ while (l >= 128)
+ {
+ if (seen_hdr++)
+ krt_parse_entry(z);
+ z += 128;
+ l -= 128;
+ }
+ }
+ if (l < 0)
+ {
+ log(L_ERR "krt read: %m");
+ return 0;
+ }
+ DBG("KRT scan done, seen %d lines\n", seen_hdr);
+ return 1;
+}
+
static void
krt_scan_fire(timer *t)
{
+ struct krt_proto *x = t->data;
+ SCANOPT;
+
DBG("Scanning kernel table...\n");
+ if (!krt_scan_proc())
+ return;
}
void