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

*** 21,30 ****
--- 21,31 ----
  /*
   * 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
*** 154,163 ****
--- 155,165 ----
  
  { 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,
*** 1030,1039 ****
--- 1032,1051 ----
                           */
                          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