svn commit: r341377 - head/sys/contrib/ipfilter/netinet

[Cy Schubert]

Author: cy
Date: Sat Dec  1 17:59:41 2018
New Revision: 341377
URL: https://svnweb.freebsd.org/changeset/base/341377

Log:
  Restore handling of PMTU discovery, removed through an unifdef(1)
  following the MFV of r254219 into r255332. In addition the 'FreeBSD'
  macro was never defined in ipfilter 5.1.2 thus it never would have
  been enabled in the first place.
  
  This work is prompted by a general cleanup of the IP Filter code
  prompted by working to resolve a PR. More to follow.
  
  MFC after:	1 week

Modified:
  head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c

Modified: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
==============================================================================
--- head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c	Sat Dec  1 17:48:28 2018	(r341376)
+++ head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c	Sat Dec  1 17:59:41 2018	(r341377)
@@ -85,6 +85,8 @@ static const char rcsid[] = "@(#)$Id$";
 #endif
 extern	int	ip_optcopy __P((struct ip *, struct ip *));
 
+VNET_DECLARE(int, path_mtu_discovery);
+#define	V_path_mtu_discovery		VNET(path_mtu_discovery)
 
 # ifdef IPFILTER_M_IPFILTER
 MALLOC_DEFINE(M_IPFILTER, "ipfilter", "IP Filter packet filter data structures");
@@ -477,11 +479,7 @@ ipf_send_ip(fin, m)
 		IP_HL_A(ip, sizeof(*oip) >> 2);
 		ip->ip_tos = oip->ip_tos;
 		ip->ip_id = fin->fin_ip->ip_id;
-#if defined(FreeBSD) && (__FreeBSD_version > 460000)
-		ip->ip_off = htons(path_mtu_discovery ? IP_DF : 0);
-#else
-		ip->ip_off = 0;
-#endif
+		ip->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
 		ip->ip_ttl = V_ip_defttl;
 		ip->ip_sum = 0;
 		break;