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: releng/10.0/sys/netinet/tcp_offload.c 237263 2012-06-19 07:34:13Z np $");
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/route.h>
41 #include <netinet/in.h>
42 #include <netinet/in_pcb.h>
43 #include <netinet/tcp.h>
44 #include <netinet/tcp_var.h>
45 #include <netinet/tcp_offload.h>
46 #define TCPOUTFLAGS
47 #include <netinet/tcp_fsm.h>
48 #include <netinet/toecore.h>
49
50 int registered_toedevs;
51
52 /*
53 * Provide an opportunity for a TOE driver to offload.
54 */
55 int
56 tcp_offload_connect(struct socket *so, struct sockaddr *nam)
57 {
58 struct ifnet *ifp;
59 struct toedev *tod;
60 struct rtentry *rt;
61 int error = EOPNOTSUPP;
62
63 INP_WLOCK_ASSERT(sotoinpcb(so));
64 KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
65 ("%s: called with sa_family %d", __func__, nam->sa_family));
66
67 if (registered_toedevs == 0)
68 return (error);
69
70 rt = rtalloc1(nam, 0, 0);
71 if (rt)
72 RT_UNLOCK(rt);
73 else
74 return (EHOSTUNREACH);
75
76 ifp = rt->rt_ifp;
77
78 if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
79 goto done;
80 if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
81 goto done;
82
83 tod = TOEDEV(ifp);
84 if (tod != NULL)
85 error = tod->tod_connect(tod, so, rt, nam);
86 done:
87 RTFREE(rt);
88 return (error);
89 }
90
91 void
92 tcp_offload_listen_start(struct tcpcb *tp)
93 {
94
95 INP_WLOCK_ASSERT(tp->t_inpcb);
96
97 EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
98 }
99
100 void
101 tcp_offload_listen_stop(struct tcpcb *tp)
102 {
103
104 INP_WLOCK_ASSERT(tp->t_inpcb);
105
106 EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
107 }
108
109 void
110 tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
111 {
112 struct toedev *tod = tp->tod;
113
114 KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
115 INP_WLOCK_ASSERT(tp->t_inpcb);
116
117 tod->tod_input(tod, tp, m);
118 }
119
120 int
121 tcp_offload_output(struct tcpcb *tp)
122 {
123 struct toedev *tod = tp->tod;
124 int error, flags;
125
126 KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
127 INP_WLOCK_ASSERT(tp->t_inpcb);
128
129 flags = tcp_outflags[tp->t_state];
130
131 if (flags & TH_RST) {
132 /* XXX: avoid repeated calls like we do for FIN */
133 error = tod->tod_send_rst(tod, tp);
134 } else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
135 (tp->t_flags & TF_SENTFIN) == 0) {
136 error = tod->tod_send_fin(tod, tp);
137 if (error == 0)
138 tp->t_flags |= TF_SENTFIN;
139 } else
140 error = tod->tod_output(tod, tp);
141
142 return (error);
143 }
144
145 void
146 tcp_offload_rcvd(struct tcpcb *tp)
147 {
148 struct toedev *tod = tp->tod;
149
150 KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
151 INP_WLOCK_ASSERT(tp->t_inpcb);
152
153 tod->tod_rcvd(tod, tp);
154 }
155
156 void
157 tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
158 {
159 struct toedev *tod = tp->tod;
160
161 KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
162 INP_WLOCK_ASSERT(tp->t_inpcb);
163
164 tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
165 }
166
167 void
168 tcp_offload_detach(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_pcb_detach(tod, tp);
176 }
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