13175 Add support for IP_RECVTOS
13182 CMSG_ macros should have man pages
Change-ID: I784aa36cfd3c17e3cccbf1fd329fa7e69b663ef9

@@ -21,10 +21,11 @@
 /*
  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
  * Copyright 2019 Joyent, Inc.
  * Copyright (c) 2016 by Delphix. All rights reserved.
+ * Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
  */
 
 #include <sys/types.h>
 #include <sys/stream.h>
 #define _SUN_TPI_VERSION 2

@@ -154,10 +155,11 @@
 
 { IP_TOS,       IPPROTO_IP, OA_RW, OA_RW, OP_NP, 0, sizeof (int), 0 },
 { T_IP_TOS,     IPPROTO_IP, OA_RW, OA_RW, OP_NP, 0, sizeof (int), 0 },
 { IP_TTL,       IPPROTO_IP, OA_RW, OA_RW, OP_NP, OP_DEF_FN,
         sizeof (int), -1 /* not initialized */ },
+{ IP_RECVTOS,   IPPROTO_IP,  OA_RW, OA_RW, OP_NP, 0, sizeof (int), 0 },
 
 { IP_SEC_OPT, IPPROTO_IP, OA_RW, OA_RW, OP_NP, OP_NODEFAULT,
         sizeof (ipsec_req_t), -1 /* not initialized */ },
 
 { IP_BOUND_IF, IPPROTO_IP, OA_RW, OA_RW, OP_NP, 0,

@@ -1030,10 +1032,20 @@
                          */
                         if (tcp->tcp_state == TCPS_LISTEN) {
                                 return (EINVAL);
                         }
                         break;
+                case IP_RECVTOS:
+                        if (!checkonly) {
+                                /*
+                                 * Force it to be sent up with the next msg
+                                 * by setting it to a value which cannot
+                                 * appear in a packet (TOS is only 8-bits)
+                                 */
+                                tcp->tcp_recvtos = 0xffffffffU;
+                        }
+                        break;
                 }
                 break;
         case IPPROTO_IPV6:
                 /*
                  * IPPROTO_IPV6 options are only supported for sockets