mirror of
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a64564109a
provide accurate TCP_INFO. Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D14816
582 lines
13 KiB
C
582 lines
13 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012 Chelsio Communications, Inc.
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* All rights reserved.
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* Written by: Navdeep Parhar <np@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/types.h>
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#include <sys/sockopt.h>
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#include <sys/sysctl.h>
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#include <sys/socket.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_types.h>
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#include <net/if_vlan_var.h>
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#include <net/if_llatbl.h>
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#include <net/route.h>
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#include <netinet/if_ether.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/nd6.h>
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#define TCPSTATES
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcp_syncache.h>
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#include <netinet/tcp_offload.h>
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#include <netinet/toecore.h>
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static struct mtx toedev_lock;
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static TAILQ_HEAD(, toedev) toedev_list;
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static eventhandler_tag listen_start_eh;
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static eventhandler_tag listen_stop_eh;
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static eventhandler_tag lle_event_eh;
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static int
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toedev_connect(struct toedev *tod __unused, struct socket *so __unused,
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struct rtentry *rt __unused, struct sockaddr *nam __unused)
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{
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return (ENOTSUP);
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}
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static int
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toedev_listen_start(struct toedev *tod __unused, struct tcpcb *tp __unused)
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{
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return (ENOTSUP);
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}
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static int
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toedev_listen_stop(struct toedev *tod __unused, struct tcpcb *tp __unused)
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{
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return (ENOTSUP);
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}
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static void
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toedev_input(struct toedev *tod __unused, struct tcpcb *tp __unused,
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struct mbuf *m)
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{
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m_freem(m);
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return;
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}
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static void
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toedev_rcvd(struct toedev *tod __unused, struct tcpcb *tp __unused)
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{
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return;
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}
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static int
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toedev_output(struct toedev *tod __unused, struct tcpcb *tp __unused)
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{
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return (ENOTSUP);
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}
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static void
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toedev_pcb_detach(struct toedev *tod __unused, struct tcpcb *tp __unused)
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{
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return;
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}
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static void
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toedev_l2_update(struct toedev *tod __unused, struct ifnet *ifp __unused,
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struct sockaddr *sa __unused, uint8_t *lladdr __unused,
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uint16_t vtag __unused)
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{
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return;
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}
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static void
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toedev_route_redirect(struct toedev *tod __unused, struct ifnet *ifp __unused,
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struct rtentry *rt0 __unused, struct rtentry *rt1 __unused)
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{
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return;
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}
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static void
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toedev_syncache_added(struct toedev *tod __unused, void *ctx __unused)
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{
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return;
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}
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static void
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toedev_syncache_removed(struct toedev *tod __unused, void *ctx __unused)
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{
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return;
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}
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static int
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toedev_syncache_respond(struct toedev *tod __unused, void *ctx __unused,
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struct mbuf *m)
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{
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m_freem(m);
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return (0);
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}
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static void
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toedev_offload_socket(struct toedev *tod __unused, void *ctx __unused,
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struct socket *so __unused)
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{
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return;
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}
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static void
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toedev_ctloutput(struct toedev *tod __unused, struct tcpcb *tp __unused,
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int sopt_dir __unused, int sopt_name __unused)
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{
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return;
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}
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static void
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toedev_tcp_info(struct toedev *tod __unused, struct tcpcb *tp __unused,
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struct tcp_info *ti __unused)
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{
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return;
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}
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/*
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* Inform one or more TOE devices about a listening socket.
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*/
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static void
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toe_listen_start(struct inpcb *inp, void *arg)
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{
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struct toedev *t, *tod;
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struct tcpcb *tp;
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INP_WLOCK_ASSERT(inp);
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KASSERT(inp->inp_pcbinfo == &V_tcbinfo,
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("%s: inp is not a TCP inp", __func__));
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if (inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT))
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return;
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tp = intotcpcb(inp);
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if (tp->t_state != TCPS_LISTEN)
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return;
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t = arg;
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mtx_lock(&toedev_lock);
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TAILQ_FOREACH(tod, &toedev_list, link) {
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if (t == NULL || t == tod)
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tod->tod_listen_start(tod, tp);
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}
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mtx_unlock(&toedev_lock);
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}
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static void
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toe_listen_start_event(void *arg __unused, struct tcpcb *tp)
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{
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struct inpcb *inp = tp->t_inpcb;
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INP_WLOCK_ASSERT(inp);
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KASSERT(tp->t_state == TCPS_LISTEN,
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("%s: t_state %s", __func__, tcpstates[tp->t_state]));
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toe_listen_start(inp, NULL);
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}
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static void
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toe_listen_stop_event(void *arg __unused, struct tcpcb *tp)
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{
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struct toedev *tod;
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#ifdef INVARIANTS
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struct inpcb *inp = tp->t_inpcb;
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#endif
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INP_WLOCK_ASSERT(inp);
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KASSERT(tp->t_state == TCPS_LISTEN,
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("%s: t_state %s", __func__, tcpstates[tp->t_state]));
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mtx_lock(&toedev_lock);
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TAILQ_FOREACH(tod, &toedev_list, link)
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tod->tod_listen_stop(tod, tp);
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mtx_unlock(&toedev_lock);
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}
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/*
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* Fill up a freshly allocated toedev struct with reasonable defaults.
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*/
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void
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init_toedev(struct toedev *tod)
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{
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tod->tod_softc = NULL;
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/*
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* Provide no-op defaults so that the kernel can call any toedev
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* function without having to check whether the TOE driver supplied one
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* or not.
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*/
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tod->tod_connect = toedev_connect;
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tod->tod_listen_start = toedev_listen_start;
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tod->tod_listen_stop = toedev_listen_stop;
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tod->tod_input = toedev_input;
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tod->tod_rcvd = toedev_rcvd;
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tod->tod_output = toedev_output;
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tod->tod_send_rst = toedev_output;
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tod->tod_send_fin = toedev_output;
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tod->tod_pcb_detach = toedev_pcb_detach;
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tod->tod_l2_update = toedev_l2_update;
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tod->tod_route_redirect = toedev_route_redirect;
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tod->tod_syncache_added = toedev_syncache_added;
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tod->tod_syncache_removed = toedev_syncache_removed;
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tod->tod_syncache_respond = toedev_syncache_respond;
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tod->tod_offload_socket = toedev_offload_socket;
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tod->tod_ctloutput = toedev_ctloutput;
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tod->tod_tcp_info = toedev_tcp_info;
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}
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/*
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* Register an active TOE device with the system. This allows it to receive
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* notifications from the kernel.
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*/
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int
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register_toedev(struct toedev *tod)
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{
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struct toedev *t;
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mtx_lock(&toedev_lock);
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TAILQ_FOREACH(t, &toedev_list, link) {
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if (t == tod) {
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mtx_unlock(&toedev_lock);
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return (EEXIST);
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}
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}
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TAILQ_INSERT_TAIL(&toedev_list, tod, link);
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registered_toedevs++;
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mtx_unlock(&toedev_lock);
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inp_apply_all(toe_listen_start, tod);
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return (0);
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}
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/*
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* Remove the TOE device from the global list of active TOE devices. It is the
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* caller's responsibility to ensure that the TOE device is quiesced prior to
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* this call.
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*/
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int
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unregister_toedev(struct toedev *tod)
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{
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struct toedev *t, *t2;
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int rc = ENODEV;
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mtx_lock(&toedev_lock);
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TAILQ_FOREACH_SAFE(t, &toedev_list, link, t2) {
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if (t == tod) {
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TAILQ_REMOVE(&toedev_list, tod, link);
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registered_toedevs--;
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rc = 0;
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break;
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}
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}
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KASSERT(registered_toedevs >= 0,
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("%s: registered_toedevs (%d) < 0", __func__, registered_toedevs));
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mtx_unlock(&toedev_lock);
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return (rc);
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}
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void
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toe_syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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struct inpcb *inp, void *tod, void *todctx)
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{
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struct socket *lso = inp->inp_socket;
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INP_WLOCK_ASSERT(inp);
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syncache_add(inc, to, th, inp, &lso, NULL, tod, todctx);
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}
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int
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toe_syncache_expand(struct in_conninfo *inc, struct tcpopt *to,
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struct tcphdr *th, struct socket **lsop)
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{
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INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
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return (syncache_expand(inc, to, th, lsop, NULL));
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}
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/*
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* General purpose check to see if a 4-tuple is in use by the kernel. If a TCP
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* header (presumably for an incoming SYN) is also provided, an existing 4-tuple
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* in TIME_WAIT may be assassinated freeing it up for re-use.
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*
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* Note that the TCP header must have been run through tcp_fields_to_host() or
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* equivalent.
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*/
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int
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toe_4tuple_check(struct in_conninfo *inc, struct tcphdr *th, struct ifnet *ifp)
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{
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struct inpcb *inp;
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if (inc->inc_flags & INC_ISIPV6) {
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inp = in6_pcblookup(&V_tcbinfo, &inc->inc6_faddr,
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inc->inc_fport, &inc->inc6_laddr, inc->inc_lport,
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INPLOOKUP_WLOCKPCB, ifp);
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} else {
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inp = in_pcblookup(&V_tcbinfo, inc->inc_faddr, inc->inc_fport,
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inc->inc_laddr, inc->inc_lport, INPLOOKUP_WLOCKPCB, ifp);
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}
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if (inp != NULL) {
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INP_WLOCK_ASSERT(inp);
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if ((inp->inp_flags & INP_TIMEWAIT) && th != NULL) {
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INP_INFO_RLOCK_ASSERT(&V_tcbinfo); /* for twcheck */
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if (!tcp_twcheck(inp, NULL, th, NULL, 0))
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return (EADDRINUSE);
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} else {
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INP_WUNLOCK(inp);
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return (EADDRINUSE);
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}
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}
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return (0);
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}
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static void
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toe_lle_event(void *arg __unused, struct llentry *lle, int evt)
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{
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struct toedev *tod;
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struct ifnet *ifp;
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struct sockaddr *sa;
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uint8_t *lladdr;
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uint16_t vtag;
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int family;
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struct sockaddr_in6 sin6;
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LLE_WLOCK_ASSERT(lle);
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ifp = lltable_get_ifp(lle->lle_tbl);
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family = lltable_get_af(lle->lle_tbl);
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if (family != AF_INET && family != AF_INET6)
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return;
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/*
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* Not interested if the interface's TOE capability is not enabled.
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*/
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if ((family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4)) ||
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(family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6)))
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return;
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tod = TOEDEV(ifp);
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if (tod == NULL)
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return;
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sa = (struct sockaddr *)&sin6;
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lltable_fill_sa_entry(lle, sa);
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vtag = 0xfff;
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if (evt != LLENTRY_RESOLVED) {
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/*
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* LLENTRY_TIMEDOUT, LLENTRY_DELETED, LLENTRY_EXPIRED all mean
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* this entry is going to be deleted.
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*/
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lladdr = NULL;
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} else {
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KASSERT(lle->la_flags & LLE_VALID,
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("%s: %p resolved but not valid?", __func__, lle));
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lladdr = (uint8_t *)lle->ll_addr;
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#ifdef VLAN_TAG
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VLAN_TAG(ifp, &vtag);
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#endif
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}
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tod->tod_l2_update(tod, ifp, sa, lladdr, vtag);
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}
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/*
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* Returns 0 or EWOULDBLOCK on success (any other value is an error). 0 means
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* lladdr and vtag are valid on return, EWOULDBLOCK means the TOE driver's
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* tod_l2_update will be called later, when the entry is resolved or times out.
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*/
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int
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toe_l2_resolve(struct toedev *tod, struct ifnet *ifp, struct sockaddr *sa,
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uint8_t *lladdr, uint16_t *vtag)
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{
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int rc;
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|
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switch (sa->sa_family) {
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#ifdef INET
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case AF_INET:
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rc = arpresolve(ifp, 0, NULL, sa, lladdr, NULL, NULL);
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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rc = nd6_resolve(ifp, 0, NULL, sa, lladdr, NULL, NULL);
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break;
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#endif
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default:
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return (EPROTONOSUPPORT);
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}
|
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|
|
if (rc == 0) {
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#ifdef VLAN_TAG
|
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if (VLAN_TAG(ifp, vtag) != 0)
|
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#endif
|
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*vtag = 0xfff;
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}
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|
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return (rc);
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}
|
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|
|
void
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toe_connect_failed(struct toedev *tod, struct inpcb *inp, int err)
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{
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|
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INP_WLOCK_ASSERT(inp);
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|
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if (!(inp->inp_flags & INP_DROPPED)) {
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struct tcpcb *tp = intotcpcb(inp);
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|
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KASSERT(tp->t_flags & TF_TOE,
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|
("%s: tp %p not offloaded.", __func__, tp));
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|
|
if (err == EAGAIN) {
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|
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/*
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|
* Temporary failure during offload, take this PCB back.
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|
* Detach from the TOE driver and do the rest of what
|
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* TCP's pru_connect would have done if the connection
|
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* wasn't offloaded.
|
|
*/
|
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|
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tod->tod_pcb_detach(tod, tp);
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KASSERT(!(tp->t_flags & TF_TOE),
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("%s: tp %p still offloaded.", __func__, tp));
|
|
tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
|
|
(void) tp->t_fb->tfb_tcp_output(tp);
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|
} else {
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|
|
INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
|
|
tp = tcp_drop(tp, err);
|
|
if (tp == NULL)
|
|
INP_WLOCK(inp); /* re-acquire */
|
|
}
|
|
}
|
|
INP_WLOCK_ASSERT(inp);
|
|
}
|
|
|
|
static int
|
|
toecore_load(void)
|
|
{
|
|
|
|
mtx_init(&toedev_lock, "toedev lock", NULL, MTX_DEF);
|
|
TAILQ_INIT(&toedev_list);
|
|
|
|
listen_start_eh = EVENTHANDLER_REGISTER(tcp_offload_listen_start,
|
|
toe_listen_start_event, NULL, EVENTHANDLER_PRI_ANY);
|
|
listen_stop_eh = EVENTHANDLER_REGISTER(tcp_offload_listen_stop,
|
|
toe_listen_stop_event, NULL, EVENTHANDLER_PRI_ANY);
|
|
lle_event_eh = EVENTHANDLER_REGISTER(lle_event, toe_lle_event, NULL,
|
|
EVENTHANDLER_PRI_ANY);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
toecore_unload(void)
|
|
{
|
|
|
|
mtx_lock(&toedev_lock);
|
|
if (!TAILQ_EMPTY(&toedev_list)) {
|
|
mtx_unlock(&toedev_lock);
|
|
return (EBUSY);
|
|
}
|
|
|
|
EVENTHANDLER_DEREGISTER(tcp_offload_listen_start, listen_start_eh);
|
|
EVENTHANDLER_DEREGISTER(tcp_offload_listen_stop, listen_stop_eh);
|
|
EVENTHANDLER_DEREGISTER(lle_event, lle_event_eh);
|
|
|
|
mtx_unlock(&toedev_lock);
|
|
mtx_destroy(&toedev_lock);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
toecore_mod_handler(module_t mod, int cmd, void *arg)
|
|
{
|
|
|
|
if (cmd == MOD_LOAD)
|
|
return (toecore_load());
|
|
|
|
if (cmd == MOD_UNLOAD)
|
|
return (toecore_unload());
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
static moduledata_t mod_data= {
|
|
"toecore",
|
|
toecore_mod_handler,
|
|
0
|
|
};
|
|
|
|
MODULE_VERSION(toecore, 1);
|
|
DECLARE_MODULE(toecore, mod_data, SI_SUB_EXEC, SI_ORDER_ANY);
|