/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2012 Chelsio Communications, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _NETINET_TOE_H_
#define _NETINET_TOE_H_
#ifndef _KERNEL
#error "no user-serviceable parts inside"
#endif
struct tcpopt;
struct tcphdr;
struct in_conninfo;
struct tcp_info;
struct toedev {
TAILQ_ENTRY(toedev) link; /* glue for toedev_list */
void *tod_softc; /* TOE driver private data */
/*
* Active open. If a failure occurs, it is reported back by the driver
* via toe_connect_failed.
*/
int (*tod_connect)(struct toedev *, struct socket *, struct rtentry *,
struct sockaddr *);
/* Passive open. */
int (*tod_listen_start)(struct toedev *, struct tcpcb *);
int (*tod_listen_stop)(struct toedev *, struct tcpcb *);
/*
* The kernel uses this routine to pass on any frame it receives for an
* offloaded connection to the TOE driver. This is an unusual event.
*/
void (*tod_input)(struct toedev *, struct tcpcb *, struct mbuf *);
/*
* This is called by the kernel during pru_rcvd for an offloaded TCP
* connection and provides an opportunity for the TOE driver to manage
* its rx window and credits.
*/
void (*tod_rcvd)(struct toedev *, struct tcpcb *);
/*
* Transmit routine. The kernel calls this to have the TOE driver
* evaluate whether there is data to be transmitted, and transmit it.
*/
int (*tod_output)(struct toedev *, struct tcpcb *);
/* Immediate teardown: send RST to peer. */
int (*tod_send_rst)(struct toedev *, struct tcpcb *);
/* Initiate orderly disconnect by sending FIN to the peer. */
int (*tod_send_fin)(struct toedev *, struct tcpcb *);
/* Called to indicate that the kernel is done with this TCP PCB. */
void (*tod_pcb_detach)(struct toedev *, struct tcpcb *);
/*
* The kernel calls this once it has information about an L2 entry that
* the TOE driver enquired about previously (via toe_l2_resolve).
*/
void (*tod_l2_update)(struct toedev *, struct ifnet *,
struct sockaddr *, uint8_t *, uint16_t);
/* XXX. Route has been redirected. */
void (*tod_route_redirect)(struct toedev *, struct ifnet *,
struct rtentry *, struct rtentry *);
/* Syncache interaction. */
void (*tod_syncache_added)(struct toedev *, void *);
void (*tod_syncache_removed)(struct toedev *, void *);
int (*tod_syncache_respond)(struct toedev *, void *, struct mbuf *);
void (*tod_offload_socket)(struct toedev *, void *, struct socket *);
/* TCP socket option */
void (*tod_ctloutput)(struct toedev *, struct tcpcb *, int, int);
/* Update software state */
void (*tod_tcp_info)(struct toedev *, struct tcpcb *,
struct tcp_info *);
};
#include <sys/eventhandler.h>
typedef void (*tcp_offload_listen_start_fn)(void *, struct tcpcb *);
typedef void (*tcp_offload_listen_stop_fn)(void *, struct tcpcb *);
EVENTHANDLER_DECLARE(tcp_offload_listen_start, tcp_offload_listen_start_fn);
EVENTHANDLER_DECLARE(tcp_offload_listen_stop, tcp_offload_listen_stop_fn);
void init_toedev(struct toedev *);
int register_toedev(struct toedev *);
int unregister_toedev(struct toedev *);
/*
* General interface for looking up L2 information for an IP address. If an
* answer is not available right away then the TOE driver's tod_l2_update will
* be called later.
*/
int toe_l2_resolve(struct toedev *, struct ifnet *, struct sockaddr *,
uint8_t *, uint16_t *);
void toe_connect_failed(struct toedev *, struct inpcb *, int);
void toe_syncache_add(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
struct inpcb *, void *, void *);
int toe_syncache_expand(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
struct socket **);
int toe_4tuple_check(struct in_conninfo *, struct tcphdr *, struct ifnet *);
#endif
