6d8fdfa9d5
Currently it has several disadvantages: - it uses single mutex to protect internal structures. It is used by data- and control- path, thus there are no parallelism at all. - it uses single list to keep encap handlers for both INET and INET6 families. - struct encaptab keeps unneeded information (src, dst, masks, protosw), that isn't used by code in the source tree. - matches are prioritized and when many tunneling interfaces are registered, encapcheck handler of each interface is invoked for each packet. The search takes O(n) for n interfaces. All this work is done with exclusive lock held. What this patch includes: - the datapath is converted to be lockless using epoch(9) KPI. - struct encaptab now linked using CK_LIST. - all unused fields removed from struct encaptab. Several new fields addedr: min_length is the minimum packet length, that encapsulation handler expects to see; exact_match is maximum number of bits, that can return an encapsulation handler, when it wants to consume a packet. - IPv6 and IPv4 handlers are stored in separate lists; - added new "encap_lookup_t" method, that will be used later. It is targeted to speedup lookup of needed interface, when gif(4)/gre(4) have many interfaces. - the need to use protosw structure is eliminated. The only pr_input method was used from this structure, so I don't see the need to keep using it. - encap_input_t method changed to avoid using mbuf tags to store softc pointer. Now it is passed directly trough encap_input_t method. encap_getarg() funtions is removed. - all sockaddr structures and code that uses them removed. We don't have any code in the tree that uses them. All consumers use encap_attach_func() method, that relies on invoking of encapcheck() to determine the needed handler. - introduced struct encap_config, it contains parameters of encap handler that is going to be registered by encap_attach() function. - encap handlers are stored in lists ordered by exact_match value, thus handlers that need more bits to match will be checked first, and if encapcheck method returns exact_match value, the search will be stopped. - all current consumers changed to use new KPI. Reviewed by: mmacy Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D15617
155 lines
4.4 KiB
C
155 lines
4.4 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 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/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <sys/sysctl.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/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 int
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in_gre_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
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{
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GRE_RLOCK_TRACKER;
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struct gre_softc *sc;
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struct ip *ip;
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sc = (struct gre_softc *)arg;
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if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
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return (0);
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M_ASSERTPKTHDR(m);
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GRE_RLOCK(sc);
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if (sc->gre_family == 0)
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goto bad;
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KASSERT(sc->gre_family == AF_INET,
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("wrong gre_family: %d", sc->gre_family));
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ip = mtod(m, struct ip *);
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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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goto bad;
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GRE_RUNLOCK(sc);
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return (32 * 3); /* src + dst + gre_hdr */
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bad:
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GRE_RUNLOCK(sc);
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return (0);
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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 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 = (sizeof(in_addr_t) << 4) + 32,
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.check = in_gre_encapcheck,
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.input = gre_input
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};
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int
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in_gre_attach(struct gre_softc *sc)
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{
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KASSERT(sc->gre_ecookie == NULL, ("gre_ecookie isn't NULL"));
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sc->gre_ecookie = ip_encap_attach(&ipv4_encap_cfg, sc, M_WAITOK);
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return (0);
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}
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