inpcb: make in_pcbdisconnect() acquire the hash lock internally

Should be no functional change.

Reviewed by:		pouria, markj
Differential Revision:	https://reviews.freebsd.org/D55968

sys/netinet/in_pcb.c

@@ -1423,13 +1423,14 @@ in_pcbdisconnect(struct inpcb *inp)
 {
 
 	INP_WLOCK_ASSERT(inp);
-	INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 	KASSERT(inp->inp_smr == SMR_SEQ_INVALID,
 	    ("%s: inp %p was already disconnected", __func__, inp));
 
+	INP_HASH_WLOCK(inp->inp_pcbinfo);
 	in_pcbremhash(inp);
 	CK_LIST_INSERT_HEAD(&inp->inp_pcbinfo->ipi_list_unconn, inp,
 	    inp_unconn_list);
+	INP_HASH_WUNLOCK(inp->inp_pcbinfo);
 
 	if ((inp->inp_socket->so_proto->pr_flags & PR_CONNREQUIRED) == 0) {
 		/* See the comment in in_pcbinshash(). */

sys/netinet/udp_usrreq.c

@@ -1528,16 +1528,12 @@ void
 udp_abort(struct socket *so)
 {
 	struct inpcb *inp;
-	struct inpcbinfo *pcbinfo;
 
-	pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 	inp = sotoinpcb(so);
 	KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
 	INP_WLOCK(inp);
 	if (inp->inp_faddr.s_addr != INADDR_ANY) {
-		INP_HASH_WLOCK(pcbinfo);
 		in_pcbdisconnect(inp);
-		INP_HASH_WUNLOCK(pcbinfo);
 		soisdisconnected(so);
 	}
 	INP_WUNLOCK(inp);
@@ -1638,16 +1634,12 @@ static void
 udp_close(struct socket *so)
 {
 	struct inpcb *inp;
-	struct inpcbinfo *pcbinfo;
 
-	pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 	inp = sotoinpcb(so);
 	KASSERT(inp != NULL, ("udp_close: inp == NULL"));
 	INP_WLOCK(inp);
 	if (inp->inp_faddr.s_addr != INADDR_ANY) {
-		INP_HASH_WLOCK(pcbinfo);
 		in_pcbdisconnect(inp);
-		INP_HASH_WUNLOCK(pcbinfo);
 		soisdisconnected(so);
 	}
 	INP_WUNLOCK(inp);
@@ -1710,9 +1702,7 @@ int
 udp_disconnect(struct socket *so)
 {
 	struct inpcb *inp;
-	struct inpcbinfo *pcbinfo;
 
-	pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 	inp = sotoinpcb(so);
 	KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
 	INP_WLOCK(inp);
@@ -1720,9 +1710,7 @@ udp_disconnect(struct socket *so)
 		INP_WUNLOCK(inp);
 		return (ENOTCONN);
 	}
-	INP_HASH_WLOCK(pcbinfo);
 	in_pcbdisconnect(inp);
-	INP_HASH_WUNLOCK(pcbinfo);
 	SOCK_LOCK(so);
 	so->so_state &= ~SS_ISCONNECTED;		/* XXX */
 	SOCK_UNLOCK(so);

sys/netinet6/in6_pcb.c

@@ -504,13 +504,14 @@ in6_pcbdisconnect(struct inpcb *inp)
 {
 
 	INP_WLOCK_ASSERT(inp);
-	INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 	KASSERT(inp->inp_smr == SMR_SEQ_INVALID,
 	    ("%s: inp %p was already disconnected", __func__, inp));
 
+	INP_HASH_WLOCK(inp->inp_pcbinfo);
 	in_pcbremhash(inp);
 	CK_LIST_INSERT_HEAD(&inp->inp_pcbinfo->ipi_list_unconn, inp,
 	    inp_unconn_list);
+	INP_HASH_WUNLOCK(inp->inp_pcbinfo);
 
 	if ((inp->inp_socket->so_proto->pr_flags & PR_CONNREQUIRED) == 0) {
 		/* See the comment in in_pcbinshash(). */

sys/netinet6/udp6_usrreq.c

@@ -986,9 +986,7 @@ static void
 udp6_abort(struct socket *so)
 {
 	struct inpcb *inp;
-	struct inpcbinfo *pcbinfo;
 
-	pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 	inp = sotoinpcb(so);
 	KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
 
@@ -1002,9 +1000,7 @@ udp6_abort(struct socket *so)
 #endif
 
 	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
-		INP_HASH_WLOCK(pcbinfo);
 		in6_pcbdisconnect(inp);
-		INP_HASH_WUNLOCK(pcbinfo);
 		soisdisconnected(so);
 	}
 	INP_WUNLOCK(inp);
@@ -1104,9 +1100,7 @@ static void
 udp6_close(struct socket *so)
 {
 	struct inpcb *inp;
-	struct inpcbinfo *pcbinfo;
 
-	pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 	inp = sotoinpcb(so);
 	KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
 
@@ -1119,9 +1113,7 @@ udp6_close(struct socket *so)
 	}
 #endif
 	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
-		INP_HASH_WLOCK(pcbinfo);
 		in6_pcbdisconnect(inp);
-		INP_HASH_WUNLOCK(pcbinfo);
 		soisdisconnected(so);
 	}
 	INP_WUNLOCK(inp);
@@ -1243,9 +1235,7 @@ static int
 udp6_disconnect(struct socket *so)
 {
 	struct inpcb *inp;
-	struct inpcbinfo *pcbinfo;
 
-	pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 	inp = sotoinpcb(so);
 	KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
 
@@ -1263,9 +1253,7 @@ udp6_disconnect(struct socket *so)
 		return (ENOTCONN);
 	}
 
-	INP_HASH_WLOCK(pcbinfo);
 	in6_pcbdisconnect(inp);
-	INP_HASH_WUNLOCK(pcbinfo);
 	SOCK_LOCK(so);
 	so->so_state &= ~SS_ISCONNECTED;		/* XXX */
 	SOCK_UNLOCK(so);