6573d7580b
- Add tracker argument to preemptible epochs - Inline epoch read path in kernel and tied modules - Change in_epoch to take an epoch as argument - Simplify tfb_tcp_do_segment to not take a ti_locked argument, there's no longer any benefit to dropping the pcbinfo lock and trying to do so just adds an error prone branchfest to these functions - Remove cases of same function recursion on the epoch as recursing is no longer free. - Remove the the TAILQ_ENTRY and epoch_section from struct thread as the tracker field is now stack or heap allocated as appropriate. Tested by: pho and Limelight Networks Reviewed by: kbowling at llnw dot com Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D16066
301 lines
8.0 KiB
C
301 lines
8.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-NetBSD
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*
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* Copyright (c) 2014, 2018 Andrey V. Elsukov <ae@FreeBSD.org>
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Heiko W.Rupp <hwr@pilhuhn.de>
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*
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* IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $
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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/jail.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#include <net/if_gre.h>
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#define GRE_TTL 30
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VNET_DEFINE(int, ip_gre_ttl) = GRE_TTL;
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#define V_ip_gre_ttl VNET(ip_gre_ttl)
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SYSCTL_INT(_net_inet_ip, OID_AUTO, grettl, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip_gre_ttl), 0, "Default TTL value for encapsulated packets");
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static VNET_DEFINE(struct gre_list *, ipv4_hashtbl) = NULL;
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#define V_ipv4_hashtbl VNET(ipv4_hashtbl)
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#define GRE_HASH(src, dst) (V_ipv4_hashtbl[\
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in_gre_hashval((src), (dst)) & (GRE_HASH_SIZE - 1)])
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#define GRE_HASH_SC(sc) GRE_HASH((sc)->gre_oip.ip_src.s_addr,\
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(sc)->gre_oip.ip_dst.s_addr)
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static uint32_t
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in_gre_hashval(in_addr_t src, in_addr_t dst)
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{
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uint32_t ret;
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ret = fnv_32_buf(&src, sizeof(src), FNV1_32_INIT);
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return (fnv_32_buf(&dst, sizeof(dst), ret));
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}
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static int
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in_gre_checkdup(const struct gre_softc *sc, in_addr_t src, in_addr_t dst)
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{
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struct gre_softc *tmp;
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if (sc->gre_family == AF_INET &&
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sc->gre_oip.ip_src.s_addr == src &&
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sc->gre_oip.ip_dst.s_addr == dst)
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return (EEXIST);
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CK_LIST_FOREACH(tmp, &GRE_HASH(src, dst), chain) {
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if (tmp == sc)
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continue;
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if (tmp->gre_oip.ip_src.s_addr == src &&
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tmp->gre_oip.ip_dst.s_addr == dst)
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return (EADDRNOTAVAIL);
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}
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return (0);
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}
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static int
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in_gre_lookup(const struct mbuf *m, int off, int proto, void **arg)
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{
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const struct ip *ip;
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struct gre_softc *sc;
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if (V_ipv4_hashtbl == NULL)
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return (0);
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MPASS(in_epoch(net_epoch_preempt));
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ip = mtod(m, const struct ip *);
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CK_LIST_FOREACH(sc, &GRE_HASH(ip->ip_dst.s_addr,
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ip->ip_src.s_addr), chain) {
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/*
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* This is an inbound packet, its ip_dst is source address
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* in softc.
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*/
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if (sc->gre_oip.ip_src.s_addr == ip->ip_dst.s_addr &&
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sc->gre_oip.ip_dst.s_addr == ip->ip_src.s_addr) {
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if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
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return (0);
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*arg = sc;
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return (ENCAP_DRV_LOOKUP);
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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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in_gre_attach(struct gre_softc *sc)
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{
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sc->gre_hlen = sizeof(struct greip);
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sc->gre_oip.ip_v = IPVERSION;
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sc->gre_oip.ip_hl = sizeof(struct ip) >> 2;
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sc->gre_oip.ip_p = IPPROTO_GRE;
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gre_updatehdr(sc, &sc->gre_gihdr->gi_gre);
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CK_LIST_INSERT_HEAD(&GRE_HASH_SC(sc), sc, chain);
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}
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void
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in_gre_setopts(struct gre_softc *sc, u_long cmd, uint32_t value)
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{
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MPASS(cmd == GRESKEY || cmd == GRESOPTS);
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/* NOTE: we are protected with gre_ioctl_sx lock */
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MPASS(sc->gre_family == AF_INET);
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CK_LIST_REMOVE(sc, chain);
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GRE_WAIT();
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if (cmd == GRESKEY)
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sc->gre_key = value;
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else
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sc->gre_options = value;
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in_gre_attach(sc);
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}
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int
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in_gre_ioctl(struct gre_softc *sc, u_long cmd, caddr_t data)
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{
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struct ifreq *ifr = (struct ifreq *)data;
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struct sockaddr_in *dst, *src;
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struct ip *ip;
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int error;
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/* NOTE: we are protected with gre_ioctl_sx lock */
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error = EINVAL;
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switch (cmd) {
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case SIOCSIFPHYADDR:
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src = &((struct in_aliasreq *)data)->ifra_addr;
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dst = &((struct in_aliasreq *)data)->ifra_dstaddr;
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/* sanity checks */
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if (src->sin_family != dst->sin_family ||
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src->sin_family != AF_INET ||
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src->sin_len != dst->sin_len ||
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src->sin_len != sizeof(*src))
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break;
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if (src->sin_addr.s_addr == INADDR_ANY ||
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dst->sin_addr.s_addr == INADDR_ANY) {
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error = EADDRNOTAVAIL;
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break;
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}
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if (V_ipv4_hashtbl == NULL)
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V_ipv4_hashtbl = gre_hashinit();
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error = in_gre_checkdup(sc, src->sin_addr.s_addr,
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dst->sin_addr.s_addr);
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if (error == EADDRNOTAVAIL)
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break;
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if (error == EEXIST) {
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/* Addresses are the same. Just return. */
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error = 0;
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break;
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}
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ip = malloc(sizeof(struct greip) + 3 * sizeof(uint32_t),
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M_GRE, M_WAITOK | M_ZERO);
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ip->ip_src.s_addr = src->sin_addr.s_addr;
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ip->ip_dst.s_addr = dst->sin_addr.s_addr;
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if (sc->gre_family != 0) {
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/* Detach existing tunnel first */
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CK_LIST_REMOVE(sc, chain);
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GRE_WAIT();
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free(sc->gre_hdr, M_GRE);
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/* XXX: should we notify about link state change? */
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}
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sc->gre_family = AF_INET;
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sc->gre_hdr = ip;
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sc->gre_oseq = 0;
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sc->gre_iseq = UINT32_MAX;
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in_gre_attach(sc);
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break;
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case SIOCGIFPSRCADDR:
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case SIOCGIFPDSTADDR:
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if (sc->gre_family != AF_INET) {
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error = EADDRNOTAVAIL;
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break;
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}
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src = (struct sockaddr_in *)&ifr->ifr_addr;
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memset(src, 0, sizeof(*src));
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src->sin_family = AF_INET;
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src->sin_len = sizeof(*src);
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src->sin_addr = (cmd == SIOCGIFPSRCADDR) ?
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sc->gre_oip.ip_src: sc->gre_oip.ip_dst;
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error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
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if (error != 0)
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memset(src, 0, sizeof(*src));
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break;
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}
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return (error);
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}
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int
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in_gre_output(struct mbuf *m, int af, int hlen)
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{
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struct greip *gi;
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gi = mtod(m, struct greip *);
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switch (af) {
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case AF_INET:
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/*
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* gre_transmit() has used M_PREPEND() that doesn't guarantee
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* m_data is contiguous more than hlen bytes. Use m_copydata()
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* here to avoid m_pullup().
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*/
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m_copydata(m, hlen + offsetof(struct ip, ip_tos),
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sizeof(u_char), &gi->gi_ip.ip_tos);
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m_copydata(m, hlen + offsetof(struct ip, ip_id),
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sizeof(u_short), (caddr_t)&gi->gi_ip.ip_id);
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break;
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#ifdef INET6
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case AF_INET6:
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gi->gi_ip.ip_tos = 0; /* XXX */
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ip_fillid(&gi->gi_ip);
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break;
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#endif
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}
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gi->gi_ip.ip_ttl = V_ip_gre_ttl;
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gi->gi_ip.ip_len = htons(m->m_pkthdr.len);
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return (ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL));
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}
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static const struct encaptab *ecookie = NULL;
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static const struct encap_config ipv4_encap_cfg = {
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.proto = IPPROTO_GRE,
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.min_length = sizeof(struct greip) + sizeof(struct ip),
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.exact_match = ENCAP_DRV_LOOKUP,
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.lookup = in_gre_lookup,
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.input = gre_input
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};
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void
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in_gre_init(void)
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{
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if (!IS_DEFAULT_VNET(curvnet))
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return;
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ecookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
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}
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void
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in_gre_uninit(void)
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{
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if (IS_DEFAULT_VNET(curvnet))
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ip_encap_detach(ecookie);
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if (V_ipv4_hashtbl != NULL)
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gre_hashdestroy(V_ipv4_hashtbl);
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}
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