[src/trunk]: src/sys/netinet Be tougher, and don't allow LSRR+SSRR (RFC7126).

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

details:   https://anonhg.NetBSD.org/src/rev/3fed37a6dc70
branches:  trunk
changeset: 829543:3fed37a6dc70
user:      maxv <maxv%NetBSD.org@localhost>
date:      Mon Feb 05 14:23:38 2018 +0000

description:
Be tougher, and don't allow LSRR+SSRR (RFC7126).

diffstat:

 sys/netinet/ip_input.c |  22 +++++++---------------
 1 files changed, 7 insertions(+), 15 deletions(-)

diffs (55 lines):

diff -r 45729e797fee -r 3fed37a6dc70 sys/netinet/ip_input.c
--- a/sys/netinet/ip_input.c    Mon Feb 05 13:52:39 2018 +0000
+++ b/sys/netinet/ip_input.c    Mon Feb 05 14:23:38 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ip_input.c,v 1.368 2018/02/05 13:52:39 maxv Exp $      */
+/*     $NetBSD: ip_input.c,v 1.369 2018/02/05 14:23:38 maxv Exp $      */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -91,7 +91,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.368 2018/02/05 13:52:39 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.369 2018/02/05 14:23:38 maxv Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -873,14 +873,13 @@
        struct ip_timestamp *ipt;
        struct in_ifaddr *ia;
        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
-       int lsrr_present, ssrr_present, rr_present, ts_present;
+       int srr_present, rr_present, ts_present;
        struct in_addr dst;
        n_time ntime;
        struct ifaddr *ifa = NULL;
        int s;
 
-       lsrr_present = 0;
-       ssrr_present = 0;
+       srr_present = 0;
        rr_present = 0;
        ts_present = 0;
 
@@ -931,16 +930,9 @@
                                code = ICMP_UNREACH_NET_PROHIB;
                                goto bad;
                        }
-                       if (opt == IPOPT_LSRR) {
-                               if (lsrr_present++) {
-                                       code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
-                                       goto bad;
-                               }
-                       } else {
-                               if (ssrr_present++) {
-                                       code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
-                                       goto bad;
-                               }
+                       if (srr_present++) {
+                               code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
+                               goto bad;
                        }
                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                                code = &cp[IPOPT_OLEN] - (u_char *)ip;