linux-user: add TARGET_SO_{DOMAIN,PROTOCOL}

These were defined for other platforms but mistakenly left out of mips
and generic, so this commit adds them to the places missing. Then it
makes them be translated in getsockopt.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210204153925.2030606-1-Jason@zx2c4.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/generic/sockbits.h

@@ -55,4 +55,7 @@
 #define TARGET_SO_ACCEPTCONN           30
 
 #define TARGET_SO_PEERSEC              31
+
+#define TARGET_SO_PROTOCOL             38
+#define TARGET_SO_DOMAIN               39
 #endif

linux-user/mips/sockbits.h

@@ -40,6 +40,8 @@
 #define TARGET_SO_SNDTIMEO     0x1005  /* send timeout */
 #define TARGET_SO_RCVTIMEO     0x1006  /* receive timeout */
 #define TARGET_SO_ACCEPTCONN   0x1009
+#define TARGET_SO_PROTOCOL     0x1028  /* protocol type */
+#define TARGET_SO_DOMAIN       0x1029  /* domain/socket family */
 
 /* linux-specific, might as well be the same as on i386 */
 #define TARGET_SO_NO_CHECK     11

linux-user/syscall.c

@@ -2837,6 +2837,12 @@ static abi_long do_getsockopt(int sockfd, int level, int optname,
         case TARGET_SO_ACCEPTCONN:
             optname = SO_ACCEPTCONN;
             goto int_case;
+        case TARGET_SO_PROTOCOL:
+            optname = SO_PROTOCOL;
+            goto int_case;
+        case TARGET_SO_DOMAIN:
+            optname = SO_DOMAIN;
+            goto int_case;
         default:
             goto int_case;
         }