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#include "opt_inet6.h"
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/eventhandler.h>
38#include <sys/mbuf.h>
39#include <sys/socket.h>
40#include <sys/socketvar.h>
41#include <sys/sockopt.h>
42#include <net/if.h>
43#include <net/if_var.h>
44#include <net/route.h>
45#include <net/route/nhop.h>
46#include <netinet/in.h>
47#include <netinet/in_pcb.h>
48#include <netinet/in_fib.h>
49#include <netinet6/in6_fib.h>
50#include <netinet/tcp.h>
51#include <netinet/tcp_offload.h>
52#define	TCPOUTFLAGS
53#include <netinet/tcp_fsm.h>
54#include <netinet/tcp_var.h>
55#include <netinet/toecore.h>
56
57int registered_toedevs;
58
59/*
60 * Provide an opportunity for a TOE driver to offload.
61 */
62int
63tcp_offload_connect(struct socket *so, struct sockaddr *nam)
64{
65	struct ifnet *ifp;
66	struct toedev *tod;
67	struct nhop_object *nh;
68	struct epoch_tracker et;
69	int error = EOPNOTSUPP;
70
71	INP_WLOCK_ASSERT(sotoinpcb(so));
72	KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
73	    ("%s: called with sa_family %d", __func__, nam->sa_family));
74
75	if (registered_toedevs == 0)
76		return (error);
77
78	NET_EPOCH_ENTER(et);
79	nh = NULL;
80#ifdef INET
81	if (nam->sa_family == AF_INET)
82		nh = fib4_lookup(0, ((struct sockaddr_in *)nam)->sin_addr,
83		    NHR_NONE, 0, 0);
84#endif
85#if defined(INET) && defined(INET6)
86	else
87#endif
88#ifdef INET6
89	if (nam->sa_family == AF_INET6)
90		nh = fib6_lookup(0, &((struct sockaddr_in6 *)nam)->sin6_addr,
91		    NHR_NONE, 0, 0);
92#endif
93	if (nh == NULL) {
94		NET_EPOCH_EXIT(et);
95		return (EHOSTUNREACH);
96	}
97
98	ifp = nh->nh_ifp;
99
100	if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
101		goto done;
102	if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
103		goto done;
104
105	tod = TOEDEV(ifp);
106	if (tod != NULL)
107		error = tod->tod_connect(tod, so, nh, nam);
108done:
109	NET_EPOCH_EXIT(et);
110	return (error);
111}
112
113void
114tcp_offload_listen_start(struct tcpcb *tp)
115{
116
117	INP_WLOCK_ASSERT(tp->t_inpcb);
118
119	EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
120}
121
122void
123tcp_offload_listen_stop(struct tcpcb *tp)
124{
125
126	INP_WLOCK_ASSERT(tp->t_inpcb);
127
128	EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
129}
130
131void
132tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
133{
134	struct toedev *tod = tp->tod;
135
136	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
137	INP_WLOCK_ASSERT(tp->t_inpcb);
138
139	tod->tod_input(tod, tp, m);
140}
141
142int
143tcp_offload_output(struct tcpcb *tp)
144{
145	struct toedev *tod = tp->tod;
146	int error, flags;
147
148	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
149	INP_WLOCK_ASSERT(tp->t_inpcb);
150
151	flags = tcp_outflags[tp->t_state];
152
153	if (flags & TH_RST) {
154		/* XXX: avoid repeated calls like we do for FIN */
155		error = tod->tod_send_rst(tod, tp);
156	} else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
157	    (tp->t_flags & TF_SENTFIN) == 0) {
158		error = tod->tod_send_fin(tod, tp);
159		if (error == 0)
160			tp->t_flags |= TF_SENTFIN;
161	} else
162		error = tod->tod_output(tod, tp);
163
164	return (error);
165}
166
167void
168tcp_offload_rcvd(struct tcpcb *tp)
169{
170	struct toedev *tod = tp->tod;
171
172	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
173	INP_WLOCK_ASSERT(tp->t_inpcb);
174
175	tod->tod_rcvd(tod, tp);
176}
177
178void
179tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
180{
181	struct toedev *tod = tp->tod;
182
183	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
184	INP_WLOCK_ASSERT(tp->t_inpcb);
185
186	tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
187}
188
189void
190tcp_offload_tcp_info(struct tcpcb *tp, struct tcp_info *ti)
191{
192	struct toedev *tod = tp->tod;
193
194	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
195	INP_WLOCK_ASSERT(tp->t_inpcb);
196
197	tod->tod_tcp_info(tod, tp, ti);
198}
199
200int
201tcp_offload_alloc_tls_session(struct tcpcb *tp, struct ktls_session *tls,
202    int direction)
203{
204	struct toedev *tod = tp->tod;
205
206	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
207	INP_WLOCK_ASSERT(tp->t_inpcb);
208
209	return (tod->tod_alloc_tls_session(tod, tp, tls, direction));
210}
211
212void
213tcp_offload_detach(struct tcpcb *tp)
214{
215	struct toedev *tod = tp->tod;
216
217	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
218	INP_WLOCK_ASSERT(tp->t_inpcb);
219
220	tod->tod_pcb_detach(tod, tp);
221}
222