1/*-
2 * Copyright (c) 2012 Chelsio Communications, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include "opt_inet.h"
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/types.h>
35#include <sys/mbuf.h>
36#include <sys/socket.h>
37#include <sys/socketvar.h>
38#include <sys/sockopt.h>
39#include <net/if.h>
40#include <net/if_var.h>
41#include <net/route.h>
42#include <netinet/in.h>
43#include <netinet/in_pcb.h>
44#include <netinet/tcp.h>
45#include <netinet/tcp_offload.h>
46#define	TCPOUTFLAGS
47#include <netinet/tcp_fsm.h>
48#include <netinet/tcp_var.h>
49#include <netinet/toecore.h>
50
51int registered_toedevs;
52
53/*
54 * Provide an opportunity for a TOE driver to offload.
55 */
56int
57tcp_offload_connect(struct socket *so, struct sockaddr *nam)
58{
59	struct ifnet *ifp;
60	struct toedev *tod;
61	struct rtentry *rt;
62	int error = EOPNOTSUPP;
63
64	INP_WLOCK_ASSERT(sotoinpcb(so));
65	KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
66	    ("%s: called with sa_family %d", __func__, nam->sa_family));
67
68	if (registered_toedevs == 0)
69		return (error);
70
71	rt = rtalloc1(nam, 0, 0);
72	if (rt)
73		RT_UNLOCK(rt);
74	else
75		return (EHOSTUNREACH);
76
77	ifp = rt->rt_ifp;
78
79	if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
80		goto done;
81	if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
82		goto done;
83
84	tod = TOEDEV(ifp);
85	if (tod != NULL)
86		error = tod->tod_connect(tod, so, rt, nam);
87done:
88	RTFREE(rt);
89	return (error);
90}
91
92void
93tcp_offload_listen_start(struct tcpcb *tp)
94{
95
96	INP_WLOCK_ASSERT(tp->t_inpcb);
97
98	EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
99}
100
101void
102tcp_offload_listen_stop(struct tcpcb *tp)
103{
104
105	INP_WLOCK_ASSERT(tp->t_inpcb);
106
107	EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
108}
109
110void
111tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
112{
113	struct toedev *tod = tp->tod;
114
115	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
116	INP_WLOCK_ASSERT(tp->t_inpcb);
117
118	tod->tod_input(tod, tp, m);
119}
120
121int
122tcp_offload_output(struct tcpcb *tp)
123{
124	struct toedev *tod = tp->tod;
125	int error, flags;
126
127	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
128	INP_WLOCK_ASSERT(tp->t_inpcb);
129
130	flags = tcp_outflags[tp->t_state];
131
132	if (flags & TH_RST) {
133		/* XXX: avoid repeated calls like we do for FIN */
134		error = tod->tod_send_rst(tod, tp);
135	} else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
136	    (tp->t_flags & TF_SENTFIN) == 0) {
137		error = tod->tod_send_fin(tod, tp);
138		if (error == 0)
139			tp->t_flags |= TF_SENTFIN;
140	} else
141		error = tod->tod_output(tod, tp);
142
143	return (error);
144}
145
146void
147tcp_offload_rcvd(struct tcpcb *tp)
148{
149	struct toedev *tod = tp->tod;
150
151	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
152	INP_WLOCK_ASSERT(tp->t_inpcb);
153
154	tod->tod_rcvd(tod, tp);
155}
156
157void
158tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
159{
160	struct toedev *tod = tp->tod;
161
162	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
163	INP_WLOCK_ASSERT(tp->t_inpcb);
164
165	tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
166}
167
168void
169tcp_offload_detach(struct tcpcb *tp)
170{
171	struct toedev *tod = tp->tod;
172
173	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
174	INP_WLOCK_ASSERT(tp->t_inpcb);
175
176	tod->tod_pcb_detach(tod, tp);
177}
178