Hi,

There is a lot of code duplication in netinet6/ip6_divert.c.  Other
protocols like UDP or TCP only keep functions that are essentially
different.  This also makes code review and understanding easier.

In a fist sweep remove divert6_detach, divert6_lock, divert6_unlock,
divert6_bind, and divert6_shutdown.  The IPv4 code is identical.

Note that INP_HDRINCL is an IPv4 only option.  It should not be in
divert6_attach.

ok?

bluhm

Index: netinet6/ip6_divert.c
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet6/ip6_divert.c,v
diff -u -p -r1.90 ip6_divert.c
--- netinet6/ip6_divert.c	16 Sep 2023 09:33:27 -0000	1.90
+++ netinet6/ip6_divert.c	1 Jan 2024 16:46:12 -0000
@@ -33,6 +33,7 @@
 #include <netinet/ip.h>
 #include <netinet/ip_var.h>
 #include <netinet/in_pcb.h>
+#include <netinet/ip_divert.h>
 #include <netinet/ip6.h>
 #include <netinet6/in6_var.h>
 #include <netinet6/ip6_divert.h>
@@ -65,11 +66,11 @@ const struct sysctl_bounded_args divert6
 
 const struct pr_usrreqs divert6_usrreqs = {
 	.pru_attach	= divert6_attach,
-	.pru_detach	= divert6_detach,
-	.pru_lock	= divert6_lock,
-	.pru_unlock	= divert6_unlock,
-	.pru_bind	= divert6_bind,
-	.pru_shutdown	= divert6_shutdown,
+	.pru_detach	= divert_detach,
+	.pru_lock	= divert_lock,
+	.pru_unlock	= divert_unlock,
+	.pru_bind	= divert_bind,
+	.pru_shutdown	= divert_shutdown,
 	.pru_send	= divert6_send,
 	.pru_control	= in6_control,
 	.pru_sockaddr	= in6_sockaddr,
@@ -272,7 +273,6 @@ divert6_attach(struct socket *so, int pr
 
 	if (so->so_pcb != NULL)
 		return EINVAL;
-
 	if ((so->so_state & SS_PRIV) == 0)
 		return EACCES;
 
@@ -283,57 +283,6 @@ divert6_attach(struct socket *so, int pr
 	error = soreserve(so, divert6_sendspace, divert6_recvspace);
 	if (error)
 		return (error);
-	sotoinpcb(so)->inp_flags |= INP_HDRINCL;
-	return (0);
-}
-
-int
-divert6_detach(struct socket *so)
-{
-	struct inpcb *inp = sotoinpcb(so);
-
-	soassertlocked(so);
-
-	if (inp == NULL)
-		return (EINVAL);
-
-	in_pcbdetach(inp);
-
-	return (0);
-}
-
-void
-divert6_lock(struct socket *so)
-{
-	struct inpcb *inp = sotoinpcb(so);
-
-	NET_ASSERT_LOCKED();
-	mtx_enter(&inp->inp_mtx);
-}
-
-void
-divert6_unlock(struct socket *so)
-{
-	struct inpcb *inp = sotoinpcb(so);
-
-	NET_ASSERT_LOCKED();
-	mtx_leave(&inp->inp_mtx);
-}
-
-int
-divert6_bind(struct socket *so, struct mbuf *addr, struct proc *p)
-{
-	struct inpcb *inp = sotoinpcb(so);
-
-	soassertlocked(so);
-	return in_pcbbind(inp, addr, p);
-}
-
-int
-divert6_shutdown(struct socket *so)
-{
-	soassertlocked(so);
-	socantsendmore(so);
 
 	return (0);
 }
Index: netinet6/ip6_divert.h
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet6/ip6_divert.h,v
diff -u -p -r1.22 ip6_divert.h
--- netinet6/ip6_divert.h	17 Oct 2022 14:49:02 -0000	1.22
+++ netinet6/ip6_divert.h	1 Jan 2024 16:46:12 -0000
@@ -71,11 +71,6 @@ void	 divert6_init(void);
 void	 divert6_packet(struct mbuf *, int, u_int16_t);
 int	 divert6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
 int	 divert6_attach(struct socket *, int, int);
-int	 divert6_detach(struct socket *);
-void	 divert6_lock(struct socket *);
-void	 divert6_unlock(struct socket *);
-int	 divert6_bind(struct socket *, struct mbuf *, struct proc *);
-int	 divert6_shutdown(struct socket *);
 int	 divert6_send(struct socket *, struct mbuf *, struct mbuf *,
 	     struct mbuf *);
 #endif /* _KERNEL */