This makes all socket types protected. The netlock is still used while
fill_file() called through *table.inpt_queue walkthroughs, but this is
the inet sockets case.

Index: sys/kern/kern_sysctl.c
===================================================================
RCS file: /cvs/src/sys/kern/kern_sysctl.c,v
retrieving revision 1.422
diff -u -p -r1.422 kern_sysctl.c
--- sys/kern/kern_sysctl.c	15 Jan 2024 15:47:37 -0000	1.422
+++ sys/kern/kern_sysctl.c	17 Jan 2024 09:47:49 -0000
@@ -1283,13 +1283,8 @@ fill_file(struct kinfo_file *kf, struct 
 		if (so == NULL) {
 			so = (struct socket *)fp->f_data;
 			/* if so is passed as parameter it is already locked */
-			switch (so->so_proto->pr_domain->dom_family) {
-			case AF_INET:
-			case AF_INET6:
-				NET_LOCK();
-				locked = 1;
-				break;
-			}
+			solock(so);
+			locked = 1;
 		}
 
 		kf->so_type = so->so_type;
@@ -1312,14 +1307,14 @@ fill_file(struct kinfo_file *kf, struct 
 			kf->so_splicelen = -1;
 		if (so->so_pcb == NULL) {
 			if (locked)
-				NET_UNLOCK();
+				sounlock(so);
 			break;
 		}
 		switch (kf->so_family) {
 		case AF_INET: {
 			struct inpcb *inpcb = so->so_pcb;
 
-			NET_ASSERT_LOCKED();
+			soassertlocked(so);
 			if (show_pointers)
 				kf->inp_ppcb = PTRTOINT64(inpcb->inp_ppcb);
 			kf->inp_lport = inpcb->inp_lport;
@@ -1341,7 +1336,7 @@ fill_file(struct kinfo_file *kf, struct 
 		case AF_INET6: {
 			struct inpcb *inpcb = so->so_pcb;
 
-			NET_ASSERT_LOCKED();
+			soassertlocked(so);
 			if (show_pointers)
 				kf->inp_ppcb = PTRTOINT64(inpcb->inp_ppcb);
 			kf->inp_lport = inpcb->inp_lport;
@@ -1388,7 +1383,7 @@ fill_file(struct kinfo_file *kf, struct 
 		    }
 		}
 		if (locked)
-			NET_UNLOCK();
+			sounlock(so);
 		break;
 	    }