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
57 int registered_toedevs;
58
59 /*
60 * Provide an opportunity for a TOE driver to offload.
61 */
62 int
63 tcp_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);
108 done:
109 NET_EPOCH_EXIT(et);
110 return (error);
111 }
112
113 void
114 tcp_offload_listen_start(struct tcpcb *tp)
115 {
116
117 INP_WLOCK_ASSERT(tptoinpcb(tp));
118
119 EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
120 }
121
122 void
123 tcp_offload_listen_stop(struct tcpcb *tp)
124 {
125
126 INP_WLOCK_ASSERT(tptoinpcb(tp));
127
128 EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
129 }
130
131 void
132 tcp_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(tptoinpcb(tp));
138
139 tod->tod_input(tod, tp, m);
140 }
141
142 int
143 tcp_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(tptoinpcb(tp));
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
167 void
168 tcp_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(tptoinpcb(tp));
174
175 tod->tod_rcvd(tod, tp);
176 }
177
178 void
179 tcp_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(tptoinpcb(tp));
185
186 tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
187 }
188
189 void
190 tcp_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(tptoinpcb(tp));
196
197 tod->tod_tcp_info(tod, tp, ti);
198 }
199
200 int
201 tcp_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(tptoinpcb(tp));
208
209 return (tod->tod_alloc_tls_session(tod, tp, tls, direction));
210 }
211
212 void
213 tcp_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(tptoinpcb(tp));
219
220 tod->tod_pcb_detach(tod, tp);
221 }
222
223 void
224 tcp_offload_pmtu_update(struct tcpcb *tp, tcp_seq seq, int mtu)
225 {
226 struct toedev *tod = tp->tod;
227
228 KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
229 INP_WLOCK_ASSERT(tptoinpcb(tp));
230
231 tod->tod_pmtu_update(tod, tp, seq, mtu);
232 }
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