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
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include "opt_inet.h"
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/types.h>
37#include <sys/mbuf.h>
38#include <sys/socket.h>
39#include <sys/socketvar.h>
40#include <sys/sockopt.h>
41#include <net/if.h>
42#include <net/if_var.h>
43#include <net/route.h>
44#include <netinet/in.h>
45#include <netinet/in_pcb.h>
46#include <netinet/tcp.h>
47#include <netinet/tcp_offload.h>
48#define	TCPOUTFLAGS
49#include <netinet/tcp_fsm.h>
50#include <netinet/tcp_var.h>
51#include <netinet/toecore.h>
52
53int registered_toedevs;
54
55/*
56 * Provide an opportunity for a TOE driver to offload.
57 */
58int
59tcp_offload_connect(struct socket *so, struct sockaddr *nam)
60{
61	struct ifnet *ifp;
62	struct toedev *tod;
63	struct rtentry *rt;
64	int error = EOPNOTSUPP;
65
66	INP_WLOCK_ASSERT(sotoinpcb(so));
67	KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
68	    ("%s: called with sa_family %d", __func__, nam->sa_family));
69
70	if (registered_toedevs == 0)
71		return (error);
72
73	rt = rtalloc1(nam, 0, 0);
74	if (rt)
75		RT_UNLOCK(rt);
76	else
77		return (EHOSTUNREACH);
78
79	ifp = rt->rt_ifp;
80
81	if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
82		goto done;
83	if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
84		goto done;
85
86	tod = TOEDEV(ifp);
87	if (tod != NULL)
88		error = tod->tod_connect(tod, so, rt, nam);
89done:
90	RTFREE(rt);
91	return (error);
92}
93
94void
95tcp_offload_listen_start(struct tcpcb *tp)
96{
97
98	INP_WLOCK_ASSERT(tp->t_inpcb);
99
100	EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
101}
102
103void
104tcp_offload_listen_stop(struct tcpcb *tp)
105{
106
107	INP_WLOCK_ASSERT(tp->t_inpcb);
108
109	EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
110}
111
112void
113tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
114{
115	struct toedev *tod = tp->tod;
116
117	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
118	INP_WLOCK_ASSERT(tp->t_inpcb);
119
120	tod->tod_input(tod, tp, m);
121}
122
123int
124tcp_offload_output(struct tcpcb *tp)
125{
126	struct toedev *tod = tp->tod;
127	int error, flags;
128
129	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
130	INP_WLOCK_ASSERT(tp->t_inpcb);
131
132	flags = tcp_outflags[tp->t_state];
133
134	if (flags & TH_RST) {
135		/* XXX: avoid repeated calls like we do for FIN */
136		error = tod->tod_send_rst(tod, tp);
137	} else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
138	    (tp->t_flags & TF_SENTFIN) == 0) {
139		error = tod->tod_send_fin(tod, tp);
140		if (error == 0)
141			tp->t_flags |= TF_SENTFIN;
142	} else
143		error = tod->tod_output(tod, tp);
144
145	return (error);
146}
147
148void
149tcp_offload_rcvd(struct tcpcb *tp)
150{
151	struct toedev *tod = tp->tod;
152
153	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
154	INP_WLOCK_ASSERT(tp->t_inpcb);
155
156	tod->tod_rcvd(tod, tp);
157}
158
159void
160tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
161{
162	struct toedev *tod = tp->tod;
163
164	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
165	INP_WLOCK_ASSERT(tp->t_inpcb);
166
167	tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
168}
169
170void
171tcp_offload_tcp_info(struct tcpcb *tp, struct tcp_info *ti)
172{
173	struct toedev *tod = tp->tod;
174
175	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
176	INP_WLOCK_ASSERT(tp->t_inpcb);
177
178	tod->tod_tcp_info(tod, tp, ti);
179}
180
181void
182tcp_offload_detach(struct tcpcb *tp)
183{
184	struct toedev *tod = tp->tod;
185
186	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
187	INP_WLOCK_ASSERT(tp->t_inpcb);
188
189	tod->tod_pcb_detach(tod, tp);
190}
191