sys/netinet/tcp_offload.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   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 #include "opt_inet.h"
  31 #include "opt_inet6.h"
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/eventhandler.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/socket.h>
  38 #include <sys/socketvar.h>
  39 #include <sys/sockopt.h>
  40 #include <net/if.h>
  41 #include <net/if_var.h>
  42 #include <net/if_private.h>
  43 #include <net/route.h>
  44 #include <net/route/nhop.h>
  45 #include <netinet/in.h>
  46 #include <netinet/in_pcb.h>
  47 #include <netinet/in_fib.h>
  48 #include <netinet6/in6_fib.h>
  49 #include <netinet/tcp.h>
  50 #include <netinet/tcp_offload.h>
  51 #define TCPOUTFLAGS
  52 #include <netinet/tcp_fsm.h>
  53 #include <netinet/tcp_var.h>
  54 #include <netinet/toecore.h>
  55
  56 int registered_toedevs;
  57
  58 /*
  59  * Provide an opportunity for a TOE driver to offload.
  60  */
  61 int
  62 tcp_offload_connect(struct socket *so, struct sockaddr *nam)
  63 {
  64         struct ifnet *ifp;
  65         struct toedev *tod;
  66         struct nhop_object *nh;
  67         struct epoch_tracker et;
  68         int error = EOPNOTSUPP;
  69
  70         INP_WLOCK_ASSERT(sotoinpcb(so));
  71         KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
  72             ("%s: called with sa_family %d", __func__, nam->sa_family));
  73
  74         if (registered_toedevs == 0)
  75                 return (error);
  76
  77         NET_EPOCH_ENTER(et);
  78         nh = NULL;
  79 #ifdef INET
  80         if (nam->sa_family == AF_INET)
  81                 nh = fib4_lookup(0, ((struct sockaddr_in *)nam)->sin_addr,
  82                     NHR_NONE, 0, 0);
  83 #endif
  84 #if defined(INET) && defined(INET6)
  85         else
  86 #endif
  87 #ifdef INET6
  88         if (nam->sa_family == AF_INET6)
  89                 nh = fib6_lookup(0, &((struct sockaddr_in6 *)nam)->sin6_addr,
  90                     NHR_NONE, 0, 0);
  91 #endif
  92         if (nh == NULL) {
  93                 NET_EPOCH_EXIT(et);
  94                 return (EHOSTUNREACH);
  95         }
  96
  97         ifp = nh->nh_ifp;
  98
  99         if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
 100                 goto done;
 101         if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
 102                 goto done;
 103
 104         tod = TOEDEV(ifp);
 105         if (tod != NULL)
 106                 error = tod->tod_connect(tod, so, nh, nam);
 107 done:
 108         NET_EPOCH_EXIT(et);
 109         return (error);
 110 }
 111
 112 void
 113 tcp_offload_listen_start(struct tcpcb *tp)
 114 {
 115
 116         INP_WLOCK_ASSERT(tptoinpcb(tp));
 117
 118         EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
 119 }
 120
 121 void
 122 tcp_offload_listen_stop(struct tcpcb *tp)
 123 {
 124
 125         INP_WLOCK_ASSERT(tptoinpcb(tp));
 126
 127         EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
 128 }
 129
 130 void
 131 tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
 132 {
 133         struct toedev *tod = tp->tod;
 134
 135         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 136         INP_WLOCK_ASSERT(tptoinpcb(tp));
 137
 138         tod->tod_input(tod, tp, m);
 139 }
 140
 141 int
 142 tcp_offload_output(struct tcpcb *tp)
 143 {
 144         struct toedev *tod = tp->tod;
 145         int error, flags;
 146
 147         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 148         INP_WLOCK_ASSERT(tptoinpcb(tp));
 149
 150         flags = tcp_outflags[tp->t_state];
 151
 152         if (flags & TH_RST) {
 153                 /* XXX: avoid repeated calls like we do for FIN */
 154                 error = tod->tod_send_rst(tod, tp);
 155         } else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
 156             (tp->t_flags & TF_SENTFIN) == 0) {
 157                 error = tod->tod_send_fin(tod, tp);
 158                 if (error == 0)
 159                         tp->t_flags |= TF_SENTFIN;
 160         } else
 161                 error = tod->tod_output(tod, tp);
 162
 163         return (error);
 164 }
 165
 166 void
 167 tcp_offload_rcvd(struct tcpcb *tp)
 168 {
 169         struct toedev *tod = tp->tod;
 170
 171         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 172         INP_WLOCK_ASSERT(tptoinpcb(tp));
 173
 174         tod->tod_rcvd(tod, tp);
 175 }
 176
 177 void
 178 tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
 179 {
 180         struct toedev *tod = tp->tod;
 181
 182         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 183         INP_WLOCK_ASSERT(tptoinpcb(tp));
 184
 185         tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
 186 }
 187
 188 void
 189 tcp_offload_tcp_info(const struct tcpcb *tp, struct tcp_info *ti)
 190 {
 191         struct toedev *tod = tp->tod;
 192
 193         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 194         INP_LOCK_ASSERT(tptoinpcb(tp));
 195
 196         tod->tod_tcp_info(tod, tp, ti);
 197 }
 198
 199 int
 200 tcp_offload_alloc_tls_session(struct tcpcb *tp, struct ktls_session *tls,
 201     int direction)
 202 {
 203         struct toedev *tod = tp->tod;
 204
 205         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 206         INP_WLOCK_ASSERT(tptoinpcb(tp));
 207
 208         return (tod->tod_alloc_tls_session(tod, tp, tls, direction));
 209 }
 210
 211 void
 212 tcp_offload_detach(struct tcpcb *tp)
 213 {
 214         struct toedev *tod = tp->tod;
 215
 216         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 217         INP_WLOCK_ASSERT(tptoinpcb(tp));
 218
 219         tod->tod_pcb_detach(tod, tp);
 220 }
 221
 222 void
 223 tcp_offload_pmtu_update(struct tcpcb *tp, tcp_seq seq, int mtu)
 224 {
 225         struct toedev *tod = tp->tod;
 226
 227         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 228         INP_WLOCK_ASSERT(tptoinpcb(tp));
 229
 230         tod->tod_pmtu_update(tod, tp, seq, mtu);
 231 }