svn commit: r365570 - stable/12/sys/netinet

[Michael Tuexen]

Author: tuexen
Date: Thu Sep 10 13:15:17 2020
New Revision: 365570
URL: https://svnweb.freebsd.org/changeset/base/365570

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.

Modified:
  stable/12/sys/netinet/tcp_syncache.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/netinet/tcp_syncache.c
==============================================================================
--- stable/12/sys/netinet/tcp_syncache.c	Thu Sep 10 12:54:46 2020	(r365569)
+++ stable/12/sys/netinet/tcp_syncache.c	Thu Sep 10 13:15:17 2020	(r365570)
@@ -2161,7 +2161,8 @@ 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
 	}