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/11.2/sys/netinet/tcp_offload.c 294869 2016-01-27 00:45:46Z glebius $");
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
51 int registered_toedevs;
52
53 /*
54 * Provide an opportunity for a TOE driver to offload.
55 */
56 int
57 tcp_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);
87 done:
88 RTFREE(rt);
89 return (error);
90 }
91
92 void
93 tcp_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
101 void
102 tcp_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
110 void
111 tcp_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
121 int
122 tcp_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
146 void
147 tcp_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
157 void
158 tcp_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
168 void
169 tcp_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 }
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