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
53 int registered_toedevs;
54
55 /*
56 * Provide an opportunity for a TOE driver to offload.
57 */
58 int
59 tcp_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);
89 done:
90 RTFREE(rt);
91 return (error);
92 }
93
94 void
95 tcp_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
103 void
104 tcp_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
112 void
113 tcp_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
123 int
124 tcp_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
148 void
149 tcp_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
159 void
160 tcp_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
170 void
171 tcp_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
181 void
182 tcp_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 }
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