FreeBSD/Linux Kernel Cross Reference
sys/netinet/toecore.h
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: releng/12.0/sys/netinet/toecore.h 331901 2018-04-03 01:08:54Z np $
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 struct tcp_info;
42
43 struct toedev {
44 TAILQ_ENTRY(toedev) link; /* glue for toedev_list */
45 void *tod_softc; /* TOE driver private data */
46
47 /*
48 * Active open. If a failure occurs, it is reported back by the driver
49 * via toe_connect_failed.
50 */
51 int (*tod_connect)(struct toedev *, struct socket *, struct rtentry *,
52 struct sockaddr *);
53
54 /* Passive open. */
55 int (*tod_listen_start)(struct toedev *, struct tcpcb *);
56 int (*tod_listen_stop)(struct toedev *, struct tcpcb *);
57
58 /*
59 * The kernel uses this routine to pass on any frame it receives for an
60 * offloaded connection to the TOE driver. This is an unusual event.
61 */
62 void (*tod_input)(struct toedev *, struct tcpcb *, struct mbuf *);
63
64 /*
65 * This is called by the kernel during pru_rcvd for an offloaded TCP
66 * connection and provides an opportunity for the TOE driver to manage
67 * its rx window and credits.
68 */
69 void (*tod_rcvd)(struct toedev *, struct tcpcb *);
70
71 /*
72 * Transmit routine. The kernel calls this to have the TOE driver
73 * evaluate whether there is data to be transmitted, and transmit it.
74 */
75 int (*tod_output)(struct toedev *, struct tcpcb *);
76
77 /* Immediate teardown: send RST to peer. */
78 int (*tod_send_rst)(struct toedev *, struct tcpcb *);
79
80 /* Initiate orderly disconnect by sending FIN to the peer. */
81 int (*tod_send_fin)(struct toedev *, struct tcpcb *);
82
83 /* Called to indicate that the kernel is done with this TCP PCB. */
84 void (*tod_pcb_detach)(struct toedev *, struct tcpcb *);
85
86 /*
87 * The kernel calls this once it has information about an L2 entry that
88 * the TOE driver enquired about previously (via toe_l2_resolve).
89 */
90 void (*tod_l2_update)(struct toedev *, struct ifnet *,
91 struct sockaddr *, uint8_t *, uint16_t);
92
93 /* XXX. Route has been redirected. */
94 void (*tod_route_redirect)(struct toedev *, struct ifnet *,
95 struct rtentry *, struct rtentry *);
96
97 /* Syncache interaction. */
98 void (*tod_syncache_added)(struct toedev *, void *);
99 void (*tod_syncache_removed)(struct toedev *, void *);
100 int (*tod_syncache_respond)(struct toedev *, void *, struct mbuf *);
101 void (*tod_offload_socket)(struct toedev *, void *, struct socket *);
102
103 /* TCP socket option */
104 void (*tod_ctloutput)(struct toedev *, struct tcpcb *, int, int);
105
106 /* Update software state */
107 void (*tod_tcp_info)(struct toedev *, struct tcpcb *,
108 struct tcp_info *);
109 };
110
111 #include <sys/eventhandler.h>
112 typedef void (*tcp_offload_listen_start_fn)(void *, struct tcpcb *);
113 typedef void (*tcp_offload_listen_stop_fn)(void *, struct tcpcb *);
114 EVENTHANDLER_DECLARE(tcp_offload_listen_start, tcp_offload_listen_start_fn);
115 EVENTHANDLER_DECLARE(tcp_offload_listen_stop, tcp_offload_listen_stop_fn);
116
117 void init_toedev(struct toedev *);
118 int register_toedev(struct toedev *);
119 int unregister_toedev(struct toedev *);
120
121 /*
122 * General interface for looking up L2 information for an IP address. If an
123 * answer is not available right away then the TOE driver's tod_l2_update will
124 * be called later.
125 */
126 int toe_l2_resolve(struct toedev *, struct ifnet *, struct sockaddr *,
127 uint8_t *, uint16_t *);
128
129 void toe_connect_failed(struct toedev *, struct inpcb *, int);
130
131 void toe_syncache_add(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
132 struct inpcb *, void *, void *);
133 int toe_syncache_expand(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
134 struct socket **);
135
136 int toe_4tuple_check(struct in_conninfo *, struct tcphdr *, struct ifnet *);
137 #endif
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