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 } 233