MFC r272886:

  Add context pointer and source address to the UDP tunnel callback

  These are needed for the forthcoming vxlan implementation. The context
  pointer means we do not have to use a spare pointer field in the inpcb,
  and the source address is required to populate vxlan's forwarding table.

4 files changed, 15 insertions, 8 deletions

diff --git a/sys/netinet/sctputil.c b/sys/netinet/sctputil.c
index fde23ef..1e87a17 100644
--- a/sys/netinet/sctputil.c
+++ b/sys/netinet/sctputil.c
@@ -6832,7 +6832,8 @@ sctp_log_trace(uint32_t subsys, const char *str SCTP_UNUSED, uint32_t a, uint32_
 
 #endif
 static void
-sctp_recv_udp_tunneled_packet(struct mbuf *m, int off, struct inpcb *ignored)
+sctp_recv_udp_tunneled_packet(struct mbuf *m, int off, struct inpcb *ignored,
+    const struct sockaddr *sa SCTP_UNUSED, void *ctx SCTP_UNUSED)
 {
 	struct ip *iph;
 
@@ -6968,7 +6969,7 @@ sctp_over_udp_start(void)
 	}
 	/* Call the special UDP hook. */
 	if ((ret = udp_set_kernel_tunneling(SCTP_BASE_INFO(udp4_tun_socket),
-	    sctp_recv_udp_tunneled_packet))) {
+	    sctp_recv_udp_tunneled_packet, NULL))) {
 		sctp_over_udp_stop();
 		return (ret);
 	}
@@ -6992,7 +6993,7 @@ sctp_over_udp_start(void)
 	}
 	/* Call the special UDP hook. */
 	if ((ret = udp_set_kernel_tunneling(SCTP_BASE_INFO(udp6_tun_socket),
-	    sctp_recv_udp_tunneled_packet))) {
+	    sctp_recv_udp_tunneled_packet, NULL))) {
 		sctp_over_udp_stop();
 		return (ret);
 	}
diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c
index 156cf10..79a2166 100644
--- a/sys/netinet/udp_usrreq.c
+++ b/sys/netinet/udp_usrreq.c
@@ -303,7 +303,8 @@ udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 	 */
 	up = intoudpcb(inp);
 	if (up->u_tun_func != NULL) {
-		(*up->u_tun_func)(n, off, inp);
+		(*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in,
+		    up->u_tun_ctx);
 		return;
 	}
 
@@ -1624,7 +1625,7 @@ udp_attach(struct socket *so, int proto, struct thread *td)
 #endif /* INET */
 
 int
-udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f)
+udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, void *ctx)
 {
 	struct inpcb *inp;
 	struct udpcb *up;
@@ -1640,6 +1641,7 @@ udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f)
 		return (EBUSY);
 	}
 	up->u_tun_func = f;
+	up->u_tun_ctx = ctx;
 	INP_WUNLOCK(inp);
 	return (0);
 }
diff --git a/sys/netinet/udp_var.h b/sys/netinet/udp_var.h
index 5b6f382..e94095e 100644
--- a/sys/netinet/udp_var.h
+++ b/sys/netinet/udp_var.h
@@ -55,7 +55,8 @@ struct udpiphdr {
 struct inpcb;
 struct mbuf;
 
-typedef void(*udp_tun_func_t)(struct mbuf *, int off, struct inpcb *);
+typedef void(*udp_tun_func_t)(struct mbuf *, int off, struct inpcb *,
+			      const struct sockaddr *, void *);
 
 /*
  * UDP control block; one per udp.
@@ -65,6 +66,7 @@ struct udpcb {
 	u_int		u_flags;	/* Generic UDP flags. */
 	uint16_t	u_rxcslen;	/* Coverage for incoming datagrams. */
 	uint16_t	u_txcslen;	/* Coverage for outgoing datagrams. */
+	void 		*u_tun_ctx;	/* Tunneling callback context. */
 };
 
 #define	intoudpcb(ip)	((struct udpcb *)(ip)->inp_ppcb)
@@ -176,7 +178,8 @@ void		udplite_input(struct mbuf *, int);
 struct inpcb	*udp_notify(struct inpcb *inp, int errno);
 int		udp_shutdown(struct socket *so);
 
-int		udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f);
+int		udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
+					 void *ctx);
 
 #endif /* _KERNEL */
 
diff --git a/sys/netinet6/udp6_usrreq.c b/sys/netinet6/udp6_usrreq.c
index ad9c7be..17de377 100644
--- a/sys/netinet6/udp6_usrreq.c
+++ b/sys/netinet6/udp6_usrreq.c
@@ -148,7 +148,8 @@ udp6_append(struct inpcb *inp, struct mbuf *n, int off,
 	 */
 	up = intoudpcb(inp);
 	if (up->u_tun_func != NULL) {
-		(*up->u_tun_func)(n, off, inp);
+		(*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
+		    up->u_tun_ctx);
 		return;
 	}
 #ifdef IPSEC