1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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#include "opt_inet.h"
31#include "opt_inet6.h"
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/eventhandler.h>
36#include <sys/mbuf.h>
37#include <sys/socket.h>
38#include <sys/socketvar.h>
39#include <sys/sockopt.h>
40#include <net/if.h>
41#include <net/if_var.h>
42#include <net/if_private.h>
43#include <net/route.h>
44#include <net/route/nhop.h>
45#include <netinet/in.h>
46#include <netinet/in_pcb.h>
47#include <netinet/in_fib.h>
48#include <netinet6/in6_fib.h>
49#include <netinet/tcp.h>
50#include <netinet/tcp_offload.h>
51#define	TCPOUTFLAGS
52#include <netinet/tcp_fsm.h>
53#include <netinet/tcp_var.h>
54#include <netinet/toecore.h>
55
56int registered_toedevs;
57
58/*
59 * Provide an opportunity for a TOE driver to offload.
60 */
61int
62tcp_offload_connect(struct socket *so, struct sockaddr *nam)
63{
64	struct ifnet *ifp;
65	struct toedev *tod;
66	struct nhop_object *nh;
67	struct epoch_tracker et;
68	int error = EOPNOTSUPP;
69
70	INP_WLOCK_ASSERT(sotoinpcb(so));
71	KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
72	    ("%s: called with sa_family %d", __func__, nam->sa_family));
73
74	if (registered_toedevs == 0)
75		return (error);
76
77	NET_EPOCH_ENTER(et);
78	nh = NULL;
79#ifdef INET
80	if (nam->sa_family == AF_INET)
81		nh = fib4_lookup(0, ((struct sockaddr_in *)nam)->sin_addr,
82		    NHR_NONE, 0, 0);
83#endif
84#if defined(INET) && defined(INET6)
85	else
86#endif
87#ifdef INET6
88	if (nam->sa_family == AF_INET6)
89		nh = fib6_lookup(0, &((struct sockaddr_in6 *)nam)->sin6_addr,
90		    NHR_NONE, 0, 0);
91#endif
92	if (nh == NULL) {
93		NET_EPOCH_EXIT(et);
94		return (EHOSTUNREACH);
95	}
96
97	ifp = nh->nh_ifp;
98
99	if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
100		goto done;
101	if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
102		goto done;
103
104	tod = TOEDEV(ifp);
105	if (tod != NULL)
106		error = tod->tod_connect(tod, so, nh, nam);
107done:
108	NET_EPOCH_EXIT(et);
109	return (error);
110}
111
112void
113tcp_offload_listen_start(struct tcpcb *tp)
114{
115
116	INP_WLOCK_ASSERT(tptoinpcb(tp));
117
118	EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
119}
120
121void
122tcp_offload_listen_stop(struct tcpcb *tp)
123{
124
125	INP_WLOCK_ASSERT(tptoinpcb(tp));
126
127	EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
128}
129
130void
131tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
132{
133	struct toedev *tod = tp->tod;
134
135	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
136	INP_WLOCK_ASSERT(tptoinpcb(tp));
137
138	tod->tod_input(tod, tp, m);
139}
140
141int
142tcp_offload_output(struct tcpcb *tp)
143{
144	struct toedev *tod = tp->tod;
145	int error, flags;
146
147	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
148	INP_WLOCK_ASSERT(tptoinpcb(tp));
149
150	flags = tcp_outflags[tp->t_state];
151
152	if (flags & TH_RST) {
153		/* XXX: avoid repeated calls like we do for FIN */
154		error = tod->tod_send_rst(tod, tp);
155	} else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
156	    (tp->t_flags & TF_SENTFIN) == 0) {
157		error = tod->tod_send_fin(tod, tp);
158		if (error == 0)
159			tp->t_flags |= TF_SENTFIN;
160	} else
161		error = tod->tod_output(tod, tp);
162
163	return (error);
164}
165
166void
167tcp_offload_rcvd(struct tcpcb *tp)
168{
169	struct toedev *tod = tp->tod;
170
171	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
172	INP_WLOCK_ASSERT(tptoinpcb(tp));
173
174	tod->tod_rcvd(tod, tp);
175}
176
177void
178tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
179{
180	struct toedev *tod = tp->tod;
181
182	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
183	INP_WLOCK_ASSERT(tptoinpcb(tp));
184
185	tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
186}
187
188void
189tcp_offload_tcp_info(const struct tcpcb *tp, struct tcp_info *ti)
190{
191	struct toedev *tod = tp->tod;
192
193	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
194	INP_LOCK_ASSERT(tptoinpcb(tp));
195
196	tod->tod_tcp_info(tod, tp, ti);
197}
198
199int
200tcp_offload_alloc_tls_session(struct tcpcb *tp, struct ktls_session *tls,
201    int direction)
202{
203	struct toedev *tod = tp->tod;
204
205	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
206	INP_WLOCK_ASSERT(tptoinpcb(tp));
207
208	return (tod->tod_alloc_tls_session(tod, tp, tls, direction));
209}
210
211void
212tcp_offload_detach(struct tcpcb *tp)
213{
214	struct toedev *tod = tp->tod;
215
216	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
217	INP_WLOCK_ASSERT(tptoinpcb(tp));
218
219	tod->tod_pcb_detach(tod, tp);
220}
221
222void
223tcp_offload_pmtu_update(struct tcpcb *tp, tcp_seq seq, int mtu)
224{
225	struct toedev *tod = tp->tod;
226
227	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
228	INP_WLOCK_ASSERT(tptoinpcb(tp));
229
230	tod->tod_pmtu_update(tod, tp, seq, mtu);
231}
232