svn commit: r360768 - stable/11/sys/netinet

[Michael Tuexen]

Author: tuexen
Date: Thu May  7 03:29:18 2020
New Revision: 360768
URL: https://svnweb.freebsd.org/changeset/base/360768

Log:
  MFC r358621:
  
  When using automatically generated flow labels and using TCP SYN
  cookies, use the same flow label for the segments sent during the
  handshake and after the handshake.
  This fixes a bug by making sure that sc_flowlabel is always stored in
  network byte order.
  
  Reviewed by:		bz
  Sponsored by:		Netflix, Inc.
  Differential Revision:	https://reviews.freebsd.org/D23957

Modified:
  stable/11/sys/netinet/tcp_syncache.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/netinet/tcp_syncache.c
==============================================================================
--- stable/11/sys/netinet/tcp_syncache.c	Thu May  7 03:27:10 2020	(r360767)
+++ stable/11/sys/netinet/tcp_syncache.c	Thu May  7 03:29:18 2020	(r360768)
@@ -2110,7 +2110,8 @@ syncookie_lookup(struct in_conninfo *inc, struct synca
 #ifdef INET6
 	case INC_ISIPV6:
 		if (sotoinpcb(lso)->inp_flags & IN6P_AUTOFLOWLABEL)
-			sc->sc_flowlabel = sc->sc_iss & IPV6_FLOWLABEL_MASK;
+			sc->sc_flowlabel =
+			    htonl(sc->sc_iss) & IPV6_FLOWLABEL_MASK;
 		break;
 #endif
 	}