sockets: plumb SO_PASSRIGHTS into *sockopt(2)

This is a little different than the others in that it's not valid for
anything but unix(4) sockets.  New cases were added that jump into the
more standard case out of a light preference for not taking advantage of
case FALLTHROUGH with the additional logic- it doesn't scale very well
for new cases added that might be slightly special, so we might as well
just add the labels up-front.

Reviewed by:	glebius, markj
Differential Revision:	https://reviews.freebsd.org/D57424

1 files changed, 18 insertions, 0 deletions

diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
index 3debec547a80..c7a7fdd44aa0 100644
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -3911,6 +3911,7 @@ sosetopt(struct socket *so, struct sockopt *sopt)
 		case SO_NO_DDP:
 		case SO_NO_OFFLOAD:
 		case SO_RERROR:
+stdopt:
 			error = sooptcopyin(sopt, &optval, sizeof optval,
 			    sizeof optval);
 			if (error)
@@ -3923,6 +3924,14 @@ sosetopt(struct socket *so, struct sockopt *sopt)
 			SOCK_UNLOCK(so);
 			break;
 
+		case SO_PASSRIGHTS:
+			if (so->so_proto->pr_domain->dom_family != AF_LOCAL) {
+				error = EOPNOTSUPP;
+				goto bad;
+			}
+
+			goto stdopt;
+
 		case SO_SETFIB:
 			error = so->so_proto->pr_ctloutput(so, sopt);
 			break;
@@ -4162,11 +4171,20 @@ sogetopt(struct socket *so, struct sockopt *sopt)
 		case SO_NO_DDP:
 		case SO_NO_OFFLOAD:
 		case SO_RERROR:
+stdopt:
 			optval = so->so_options & sopt->sopt_name;
 integer:
 			error = sooptcopyout(sopt, &optval, sizeof optval);
 			break;
 
+		case SO_PASSRIGHTS:
+			if (so->so_proto->pr_domain->dom_family != AF_LOCAL) {
+				error = EOPNOTSUPP;
+				goto bad;
+			}
+
+			goto stdopt;
+
 		case SO_FIB:
 			SOCK_LOCK(so);
 			optval = so->so_fibnum;