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
139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*-
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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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* 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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*
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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/lock.h>
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#include <sys/rmlock.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/queue.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.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_systm.h>
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#ifdef INET
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#include <net/ethernet.h>
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#include <netinet/ip.h>
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#endif
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#include <netinet/ip_encap.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_var.h>
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#include <net/if_gre.h>
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VNET_DEFINE(int, ip6_gre_hlim) = IPV6_DEFHLIM;
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#define V_ip6_gre_hlim VNET(ip6_gre_hlim)
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SYSCTL_DECL(_net_inet6_ip6);
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SYSCTL_INT(_net_inet6_ip6, OID_AUTO, grehlim, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip6_gre_hlim), 0, "Default hop limit for encapsulated packets");
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static int
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in6_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 ip6_hdr *ip6;
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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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/*
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* We expect that payload contains at least IPv4
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* or IPv6 packet.
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*/
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if (m->m_pkthdr.len < sizeof(struct greip6) +
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#ifdef INET
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sizeof(struct ip))
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#else
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sizeof(struct ip6_hdr))
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#endif
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return (0);
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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_INET6,
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("wrong gre_family: %d", sc->gre_family));
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ip6 = mtod(m, struct ip6_hdr *);
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if (!IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src, &ip6->ip6_dst) ||
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!IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, &ip6->ip6_src))
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goto bad;
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GRE_RUNLOCK(sc);
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return (128 * 2 + 32);
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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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in6_gre_output(struct mbuf *m, int af, int hlen)
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{
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struct greip6 *gi6;
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gi6 = mtod(m, struct greip6 *);
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gi6->gi6_ip6.ip6_hlim = V_ip6_gre_hlim;
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return (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, NULL));
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}
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static const struct encap_config ipv6_encap_cfg = {
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.proto = IPPROTO_GRE,
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.min_length = sizeof(struct greip6) + sizeof(struct ip),
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.exact_match = (sizeof(struct in6_addr) << 4) + 32,
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.check = in6_gre_encapcheck,
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.input = gre_input
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};
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int
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in6_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 = ip6_encap_attach(&ipv6_encap_cfg, sc, M_WAITOK);
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return (0);
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}
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