[src/trunk]: src/sys/net Add the id check for TERM_ACK

[yamaguchi <yamaguchi%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/76e4a82d6d17
branches:  trunk
changeset: 957357:76e4a82d6d17
user:      yamaguchi <yamaguchi%NetBSD.org@localhost>
date:      Wed Nov 25 10:08:22 2020 +0000

description:
Add the id check for TERM_ACK

diffstat:

 sys/net/if_spppsubr.c |  16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diffs (37 lines):

diff -r c33e01a336df -r 76e4a82d6d17 sys/net/if_spppsubr.c
--- a/sys/net/if_spppsubr.c     Wed Nov 25 10:05:40 2020 +0000
+++ b/sys/net/if_spppsubr.c     Wed Nov 25 10:08:22 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_spppsubr.c,v 1.206 2020/11/25 10:05:40 yamaguchi Exp $       */
+/*     $NetBSD: if_spppsubr.c,v 1.207 2020/11/25 10:08:22 yamaguchi Exp $       */
 
 /*
  * Synchronous PPP/Cisco link level subroutines.
@@ -41,7 +41,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.206 2020/11/25 10:05:40 yamaguchi Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.207 2020/11/25 10:08:22 yamaguchi Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_inet.h"
@@ -1717,6 +1717,18 @@
                sppp_wq_add(sp->wq_cp, &sp->scp[cp->protoidx].work_rtr);
                break;
        case TERM_ACK:
+               if (h->ident != sp->scp[cp->protoidx].confid &&
+                   h->ident != sp->scp[cp->protoidx].seq) {
+                       if (debug)
+                               addlog("%s: %s id mismatch "
+                                   "0x%x != 0x%x and 0x%x != %0lx\n",
+                                   ifp->if_xname, cp->name,
+                                   h->ident, sp->scp[cp->protoidx].confid,
+                                   h->ident, sp->scp[cp->protoidx].seq);
+                       if_statinc(ifp, if_ierrors);
+                       break;
+               }
+
                sppp_wq_add(sp->wq_cp, &sp->scp[cp->protoidx].work_rta);
                break;
        case CODE_REJ: