1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Chelsio Communications, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _NETINET_TOE_H_ 32 #define _NETINET_TOE_H_ 33 34 #ifndef _KERNEL 35 #error "no user-serviceable parts inside" 36 #endif 37 38 struct tcpopt; 39 struct tcphdr; 40 struct in_conninfo; 41 42 struct toedev { 43 TAILQ_ENTRY(toedev) link; /* glue for toedev_list */ 44 void *tod_softc; /* TOE driver private data */ 45 46 /* 47 * Active open. If a failure occurs, it is reported back by the driver 48 * via toe_connect_failed. 49 */ 50 int (*tod_connect)(struct toedev *, struct socket *, struct rtentry *, 51 struct sockaddr *); 52 53 /* Passive open. */ 54 int (*tod_listen_start)(struct toedev *, struct tcpcb *); 55 int (*tod_listen_stop)(struct toedev *, struct tcpcb *); 56 57 /* 58 * The kernel uses this routine to pass on any frame it receives for an 59 * offloaded connection to the TOE driver. This is an unusual event. 60 */ 61 void (*tod_input)(struct toedev *, struct tcpcb *, struct mbuf *); 62 63 /* 64 * This is called by the kernel during pru_rcvd for an offloaded TCP 65 * connection and provides an opportunity for the TOE driver to manage 66 * its rx window and credits. 67 */ 68 void (*tod_rcvd)(struct toedev *, struct tcpcb *); 69 70 /* 71 * Transmit routine. The kernel calls this to have the TOE driver 72 * evaluate whether there is data to be transmitted, and transmit it. 73 */ 74 int (*tod_output)(struct toedev *, struct tcpcb *); 75 76 /* Immediate teardown: send RST to peer. */ 77 int (*tod_send_rst)(struct toedev *, struct tcpcb *); 78 79 /* Initiate orderly disconnect by sending FIN to the peer. */ 80 int (*tod_send_fin)(struct toedev *, struct tcpcb *); 81 82 /* Called to indicate that the kernel is done with this TCP PCB. */ 83 void (*tod_pcb_detach)(struct toedev *, struct tcpcb *); 84 85 /* 86 * The kernel calls this once it has information about an L2 entry that 87 * the TOE driver enquired about previously (via toe_l2_resolve). 88 */ 89 void (*tod_l2_update)(struct toedev *, struct ifnet *, 90 struct sockaddr *, uint8_t *, uint16_t); 91 92 /* XXX. Route has been redirected. */ 93 void (*tod_route_redirect)(struct toedev *, struct ifnet *, 94 struct rtentry *, struct rtentry *); 95 96 /* Syncache interaction. */ 97 void (*tod_syncache_added)(struct toedev *, void *); 98 void (*tod_syncache_removed)(struct toedev *, void *); 99 int (*tod_syncache_respond)(struct toedev *, void *, struct mbuf *); 100 void (*tod_offload_socket)(struct toedev *, void *, struct socket *); 101 102 /* TCP socket option */ 103 void (*tod_ctloutput)(struct toedev *, struct tcpcb *, int, int); 104 }; 105 106 #include <sys/eventhandler.h> 107 typedef void (*tcp_offload_listen_start_fn)(void *, struct tcpcb *); 108 typedef void (*tcp_offload_listen_stop_fn)(void *, struct tcpcb *); 109 EVENTHANDLER_DECLARE(tcp_offload_listen_start, tcp_offload_listen_start_fn); 110 EVENTHANDLER_DECLARE(tcp_offload_listen_stop, tcp_offload_listen_stop_fn); 111 112 void init_toedev(struct toedev *); 113 int register_toedev(struct toedev *); 114 int unregister_toedev(struct toedev *); 115 116 /* 117 * General interface for looking up L2 information for an IP address. If an 118 * answer is not available right away then the TOE driver's tod_l2_update will 119 * be called later. 120 */ 121 int toe_l2_resolve(struct toedev *, struct ifnet *, struct sockaddr *, 122 uint8_t *, uint16_t *); 123 124 void toe_connect_failed(struct toedev *, struct inpcb *, int); 125 126 void toe_syncache_add(struct in_conninfo *, struct tcpopt *, struct tcphdr *, 127 struct inpcb *, void *, void *); 128 int toe_syncache_expand(struct in_conninfo *, struct tcpopt *, struct tcphdr *, 129 struct socket **); 130 131 int toe_4tuple_check(struct in_conninfo *, struct tcphdr *, struct ifnet *); 132 #endif 133