1 /*-
2 * Copyright (c) 2007, Chelsio 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 are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Neither the name of the Chelsio Corporation nor the names of its
12 * contributors may be used to endorse or promote products derived from
13 * this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/8.3/sys/netinet/tcp_offload.c 199583 2009-11-20 15:27:52Z jhb $");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/types.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
36 #include <sys/sysctl.h>
37 #include <sys/mbuf.h>
38 #include <sys/socket.h>
39 #include <sys/socketvar.h>
40
41 #include <net/if.h>
42 #include <net/if_types.h>
43 #include <net/if_var.h>
44 #include <net/route.h>
45 #include <net/vnet.h>
46
47 #include <netinet/in.h>
48 #include <netinet/in_systm.h>
49 #include <netinet/in_pcb.h>
50 #include <netinet/tcp.h>
51 #include <netinet/tcp_var.h>
52 #include <netinet/tcp_offload.h>
53 #include <netinet/toedev.h>
54
55 uint32_t toedev_registration_count;
56
57 int
58 tcp_offload_connect(struct socket *so, struct sockaddr *nam)
59 {
60 struct ifnet *ifp;
61 struct toedev *tdev;
62 struct rtentry *rt;
63 int error;
64
65 if (toedev_registration_count == 0)
66 return (EINVAL);
67
68 /*
69 * Look up the route used for the connection to
70 * determine if it uses an interface capable of
71 * offloading the connection.
72 */
73 rt = rtalloc1(nam, 0 /*report*/, 0 /*ignflags*/);
74 if (rt)
75 RT_UNLOCK(rt);
76 else
77 return (EHOSTUNREACH);
78
79 ifp = rt->rt_ifp;
80 if ((ifp->if_capenable & IFCAP_TOE) == 0) {
81 error = EINVAL;
82 goto fail;
83 }
84
85 tdev = TOEDEV(ifp);
86 if (tdev == NULL) {
87 error = EPERM;
88 goto fail;
89 }
90
91 if (tdev->tod_can_offload(tdev, so) == 0) {
92 error = EPERM;
93 goto fail;
94 }
95
96 return (tdev->tod_connect(tdev, so, rt, nam));
97 fail:
98 RTFREE(rt);
99 return (error);
100 }
101
102
103 /*
104 * This file contains code as a short-term staging area before it is moved in
105 * to sys/netinet/tcp_offload.c
106 */
107
108 void
109 tcp_offload_twstart(struct tcpcb *tp)
110 {
111
112 INP_INFO_WLOCK(&V_tcbinfo);
113 INP_WLOCK(tp->t_inpcb);
114 tcp_twstart(tp);
115 INP_INFO_WUNLOCK(&V_tcbinfo);
116 }
117
118 struct tcpcb *
119 tcp_offload_close(struct tcpcb *tp)
120 {
121
122 INP_INFO_WLOCK(&V_tcbinfo);
123 INP_WLOCK(tp->t_inpcb);
124 tp = tcp_close(tp);
125 INP_INFO_WUNLOCK(&V_tcbinfo);
126 if (tp)
127 INP_WUNLOCK(tp->t_inpcb);
128
129 return (tp);
130 }
131
132 struct tcpcb *
133 tcp_offload_drop(struct tcpcb *tp, int error)
134 {
135
136 INP_INFO_WLOCK(&V_tcbinfo);
137 INP_WLOCK(tp->t_inpcb);
138 tp = tcp_drop(tp, error);
139 INP_INFO_WUNLOCK(&V_tcbinfo);
140 if (tp)
141 INP_WUNLOCK(tp->t_inpcb);
142
143 return (tp);
144 }
145
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