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("$FreeBSD$"); 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_var.h> 46 #include <netinet/tcp_offload.h> 47 #define TCPOUTFLAGS 48 #include <netinet/tcp_fsm.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 } 178