766 lines
19 KiB
C
766 lines
19 KiB
C
/* $FreeBSD$ */
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/* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi Exp $ */
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/*-
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* Copyright (C) 2000 WIDE Project.
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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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* 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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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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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/*
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* 6to4 interface, based on RFC3056.
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*
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* 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting.
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* There is no address mapping defined from IPv6 multicast address to IPv4
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* address. Therefore, we do not have IFF_MULTICAST on the interface.
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*
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* Due to the lack of address mapping for link-local addresses, we cannot
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* throw packets toward link-local addresses (fe80::x). Also, we cannot throw
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* packets to link-local multicast addresses (ff02::x).
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*
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* Here are interesting symptoms due to the lack of link-local address:
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*
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* Unicast routing exchange:
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* - RIPng: Impossible. Uses link-local multicast packet toward ff02::9,
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* and link-local addresses as nexthop.
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* - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address
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* assigned to the link, and makes use of them. Also, HELLO packets use
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* link-local multicast addresses (ff02::5 and ff02::6).
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* - BGP4+: Maybe. You can only use global address as nexthop, and global
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* address as TCP endpoint address.
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*
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* Multicast routing protocols:
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* - PIM: Hello packet cannot be used to discover adjacent PIM routers.
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* Adjacent PIM routers must be configured manually (is it really spec-wise
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* correct thing to do?).
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*
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* ICMPv6:
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* - Redirects cannot be used due to the lack of link-local address.
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*
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* stf interface does not have, and will not need, a link-local address.
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* It seems to have no real benefit and does not help the above symptoms much.
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* Even if we assign link-locals to interface, we cannot really
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* use link-local unicast/multicast on top of 6to4 cloud (since there's no
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* encapsulation defined for link-local address), and the above analysis does
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* not change. RFC3056 does not mandate the assignment of link-local address
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* either.
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*
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* 6to4 interface has security issues. Refer to
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* http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt
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* for details. The code tries to filter out some of malicious packets.
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* Note that there is no way to be 100% secure.
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*/
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#include <sys/param.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/lock.h>
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#include <sys/module.h>
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#include <sys/protosw.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/rmlock.h>
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#include <sys/sysctl.h>
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#include <machine/cpu.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/if_clone.h>
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#include <net/route.h>
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#include <net/netisr.h>
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#include <net/if_types.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_fib.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_var.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 <netinet/ip_ecn.h>
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#include <netinet/ip_encap.h>
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#include <machine/stdarg.h>
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#include <net/bpf.h>
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#include <security/mac/mac_framework.h>
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SYSCTL_DECL(_net_link);
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static SYSCTL_NODE(_net_link, IFT_STF, stf, CTLFLAG_RW, 0, "6to4 Interface");
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static int stf_permit_rfc1918 = 0;
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SYSCTL_INT(_net_link_stf, OID_AUTO, permit_rfc1918, CTLFLAG_RWTUN,
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&stf_permit_rfc1918, 0, "Permit the use of private IPv4 addresses");
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#define STFUNIT 0
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#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
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/*
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* XXX: Return a pointer with 16-bit aligned. Don't cast it to
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* struct in_addr *; use bcopy() instead.
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*/
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#define GET_V4(x) (&(x)->s6_addr16[1])
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struct stf_softc {
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struct ifnet *sc_ifp;
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u_int sc_fibnum;
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const struct encaptab *encap_cookie;
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};
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#define STF2IFP(sc) ((sc)->sc_ifp)
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static const char stfname[] = "stf";
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static MALLOC_DEFINE(M_STF, stfname, "6to4 Tunnel Interface");
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static const int ip_stf_ttl = 40;
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extern struct domain inetdomain;
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static int in_stf_input(struct mbuf **, int *, int);
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static struct protosw in_stf_protosw = {
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_IPV6,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = in_stf_input,
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.pr_output = rip_output,
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.pr_ctloutput = rip_ctloutput,
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.pr_usrreqs = &rip_usrreqs
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};
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static char *stfnames[] = {"stf0", "stf", "6to4", NULL};
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static int stfmodevent(module_t, int, void *);
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static int stf_encapcheck(const struct mbuf *, int, int, void *);
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static int stf_getsrcifa6(struct ifnet *, struct in6_addr *, struct in6_addr *);
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static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
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struct route *);
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static int isrfc1918addr(struct in_addr *);
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static int stf_checkaddr4(struct stf_softc *, struct in_addr *,
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struct ifnet *);
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static int stf_checkaddr6(struct stf_softc *, struct in6_addr *,
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struct ifnet *);
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static int stf_ioctl(struct ifnet *, u_long, caddr_t);
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static int stf_clone_match(struct if_clone *, const char *);
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static int stf_clone_create(struct if_clone *, char *, size_t, caddr_t);
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static int stf_clone_destroy(struct if_clone *, struct ifnet *);
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static struct if_clone *stf_cloner;
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static int
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stf_clone_match(struct if_clone *ifc, const char *name)
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{
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int i;
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for(i = 0; stfnames[i] != NULL; i++) {
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if (strcmp(stfnames[i], name) == 0)
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return (1);
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}
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return (0);
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}
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static int
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stf_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
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{
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char *dp;
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int err, unit, wildcard;
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struct stf_softc *sc;
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struct ifnet *ifp;
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err = ifc_name2unit(name, &unit);
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if (err != 0)
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return (err);
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wildcard = (unit < 0);
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/*
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* We can only have one unit, but since unit allocation is
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* already locked, we use it to keep from allocating extra
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* interfaces.
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*/
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unit = STFUNIT;
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err = ifc_alloc_unit(ifc, &unit);
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if (err != 0)
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return (err);
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sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO);
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ifp = STF2IFP(sc) = if_alloc(IFT_STF);
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if (ifp == NULL) {
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free(sc, M_STF);
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ifc_free_unit(ifc, unit);
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return (ENOSPC);
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}
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ifp->if_softc = sc;
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sc->sc_fibnum = curthread->td_proc->p_fibnum;
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/*
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* Set the name manually rather then using if_initname because
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* we don't conform to the default naming convention for interfaces.
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* In the wildcard case, we need to update the name.
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*/
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if (wildcard) {
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for (dp = name; *dp != '\0'; dp++);
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if (snprintf(dp, len - (dp-name), "%d", unit) >
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len - (dp-name) - 1) {
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/*
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* This can only be a programmer error and
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* there's no straightforward way to recover if
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* it happens.
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*/
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panic("if_clone_create(): interface name too long");
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}
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}
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strlcpy(ifp->if_xname, name, IFNAMSIZ);
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ifp->if_dname = stfname;
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ifp->if_dunit = IF_DUNIT_NONE;
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sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6,
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stf_encapcheck, &in_stf_protosw, sc);
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if (sc->encap_cookie == NULL) {
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if_printf(ifp, "attach failed\n");
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free(sc, M_STF);
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ifc_free_unit(ifc, unit);
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return (ENOMEM);
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}
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ifp->if_mtu = IPV6_MMTU;
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ifp->if_ioctl = stf_ioctl;
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ifp->if_output = stf_output;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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if_attach(ifp);
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bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
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return (0);
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}
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static int
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stf_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
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{
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struct stf_softc *sc = ifp->if_softc;
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int err;
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err = encap_detach(sc->encap_cookie);
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KASSERT(err == 0, ("Unexpected error detaching encap_cookie"));
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bpfdetach(ifp);
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if_detach(ifp);
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if_free(ifp);
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free(sc, M_STF);
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ifc_free_unit(ifc, STFUNIT);
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return (0);
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}
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static int
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stfmodevent(module_t mod, int type, void *data)
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{
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switch (type) {
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case MOD_LOAD:
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stf_cloner = if_clone_advanced(stfname, 0, stf_clone_match,
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stf_clone_create, stf_clone_destroy);
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break;
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case MOD_UNLOAD:
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if_clone_detach(stf_cloner);
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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static moduledata_t stf_mod = {
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"if_stf",
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stfmodevent,
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0
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};
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DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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static int
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stf_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
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{
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struct ip ip;
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struct stf_softc *sc;
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struct in_addr a, b, mask;
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struct in6_addr addr6, mask6;
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sc = (struct stf_softc *)arg;
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if (sc == NULL)
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return 0;
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if ((STF2IFP(sc)->if_flags & IFF_UP) == 0)
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return 0;
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/* IFF_LINK0 means "no decapsulation" */
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if ((STF2IFP(sc)->if_flags & IFF_LINK0) != 0)
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return 0;
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if (proto != IPPROTO_IPV6)
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return 0;
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m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
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if (ip.ip_v != 4)
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return 0;
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if (stf_getsrcifa6(STF2IFP(sc), &addr6, &mask6) != 0)
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return (0);
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/*
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* check if IPv4 dst matches the IPv4 address derived from the
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* local 6to4 address.
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* success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
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*/
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if (bcmp(GET_V4(&addr6), &ip.ip_dst, sizeof(ip.ip_dst)) != 0)
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return 0;
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/*
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* check if IPv4 src matches the IPv4 address derived from the
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* local 6to4 address masked by prefixmask.
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* success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
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* fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
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*/
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bzero(&a, sizeof(a));
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bcopy(GET_V4(&addr6), &a, sizeof(a));
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bcopy(GET_V4(&mask6), &mask, sizeof(mask));
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a.s_addr &= mask.s_addr;
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b = ip.ip_src;
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b.s_addr &= mask.s_addr;
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if (a.s_addr != b.s_addr)
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return 0;
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/* stf interface makes single side match only */
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return 32;
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}
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static int
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stf_getsrcifa6(struct ifnet *ifp, struct in6_addr *addr, struct in6_addr *mask)
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{
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struct ifaddr *ia;
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struct in_ifaddr *ia4;
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struct in6_ifaddr *ia6;
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struct sockaddr_in6 *sin6;
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struct in_addr in;
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if_addr_rlock(ifp);
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TAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) {
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if (ia->ifa_addr->sa_family != AF_INET6)
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continue;
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sin6 = (struct sockaddr_in6 *)ia->ifa_addr;
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if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
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continue;
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bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
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LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash)
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if (ia4->ia_addr.sin_addr.s_addr == in.s_addr)
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break;
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if (ia4 == NULL)
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continue;
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ia6 = (struct in6_ifaddr *)ia;
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*addr = sin6->sin6_addr;
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*mask = ia6->ia_prefixmask.sin6_addr;
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if_addr_runlock(ifp);
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return (0);
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}
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if_addr_runlock(ifp);
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return (ENOENT);
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}
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static int
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stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
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struct route *ro)
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{
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struct stf_softc *sc;
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const struct sockaddr_in6 *dst6;
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struct in_addr in4;
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const void *ptr;
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u_int8_t tos;
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struct ip *ip;
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struct ip6_hdr *ip6;
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struct in6_addr addr6, mask6;
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int error;
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#ifdef MAC
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error = mac_ifnet_check_transmit(ifp, m);
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if (error) {
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m_freem(m);
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return (error);
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}
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#endif
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sc = ifp->if_softc;
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dst6 = (const struct sockaddr_in6 *)dst;
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/* just in case */
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if ((ifp->if_flags & IFF_UP) == 0) {
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m_freem(m);
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if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
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return ENETDOWN;
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}
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/*
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* If we don't have an ip4 address that match my inner ip6 address,
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* we shouldn't generate output. Without this check, we'll end up
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* using wrong IPv4 source.
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*/
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if (stf_getsrcifa6(ifp, &addr6, &mask6) != 0) {
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m_freem(m);
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if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
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return ENETDOWN;
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}
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if (m->m_len < sizeof(*ip6)) {
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m = m_pullup(m, sizeof(*ip6));
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if (!m) {
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if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
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return ENOBUFS;
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}
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}
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ip6 = mtod(m, struct ip6_hdr *);
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tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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/*
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* Pickup the right outer dst addr from the list of candidates.
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* ip6_dst has priority as it may be able to give us shorter IPv4 hops.
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*/
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ptr = NULL;
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if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
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ptr = GET_V4(&ip6->ip6_dst);
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else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
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ptr = GET_V4(&dst6->sin6_addr);
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else {
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m_freem(m);
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if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
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return ENETUNREACH;
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}
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bcopy(ptr, &in4, sizeof(in4));
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if (bpf_peers_present(ifp->if_bpf)) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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|
* to pacify bpf. This is safe because bpf
|
|
* will only read from the mbuf (i.e., it won't
|
|
* try to free it or keep a pointer a to it).
|
|
*/
|
|
u_int af = AF_INET6;
|
|
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
|
|
}
|
|
|
|
M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
|
|
if (m == NULL) {
|
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
|
return ENOBUFS;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
|
|
bzero(ip, sizeof(*ip));
|
|
|
|
bcopy(GET_V4(&addr6), &ip->ip_src, sizeof(ip->ip_src));
|
|
bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst));
|
|
ip->ip_p = IPPROTO_IPV6;
|
|
ip->ip_ttl = ip_stf_ttl;
|
|
ip->ip_len = htons(m->m_pkthdr.len);
|
|
if (ifp->if_flags & IFF_LINK1)
|
|
ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
|
|
else
|
|
ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
|
|
|
|
M_SETFIB(m, sc->sc_fibnum);
|
|
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
|
|
error = ip_output(m, NULL, NULL, 0, NULL, NULL);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
isrfc1918addr(struct in_addr *in)
|
|
{
|
|
/*
|
|
* returns 1 if private address range:
|
|
* 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
|
|
*/
|
|
if (stf_permit_rfc1918 == 0 && (
|
|
(ntohl(in->s_addr) & 0xff000000) >> 24 == 10 ||
|
|
(ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 ||
|
|
(ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, struct ifnet *inifp)
|
|
{
|
|
struct rm_priotracker in_ifa_tracker;
|
|
struct in_ifaddr *ia4;
|
|
|
|
/*
|
|
* reject packets with the following address:
|
|
* 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
|
|
*/
|
|
if (IN_MULTICAST(ntohl(in->s_addr)))
|
|
return -1;
|
|
switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
|
|
case 0: case 127: case 255:
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* reject packets with private address range.
|
|
* (requirement from RFC3056 section 2 1st paragraph)
|
|
*/
|
|
if (isrfc1918addr(in))
|
|
return -1;
|
|
|
|
/*
|
|
* reject packets with broadcast
|
|
*/
|
|
IN_IFADDR_RLOCK(&in_ifa_tracker);
|
|
TAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) {
|
|
if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
|
|
continue;
|
|
if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
|
|
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
|
|
return -1;
|
|
}
|
|
}
|
|
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
|
|
|
|
/*
|
|
* perform ingress filter
|
|
*/
|
|
if (sc && (STF2IFP(sc)->if_flags & IFF_LINK2) == 0 && inifp) {
|
|
struct nhop4_basic nh4;
|
|
|
|
if (fib4_lookup_nh_basic(sc->sc_fibnum, *in, 0, 0, &nh4) != 0)
|
|
return (-1);
|
|
|
|
if (nh4.nh_ifp != inifp)
|
|
return (-1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, struct ifnet *inifp)
|
|
{
|
|
/*
|
|
* check 6to4 addresses
|
|
*/
|
|
if (IN6_IS_ADDR_6TO4(in6)) {
|
|
struct in_addr in4;
|
|
bcopy(GET_V4(in6), &in4, sizeof(in4));
|
|
return stf_checkaddr4(sc, &in4, inifp);
|
|
}
|
|
|
|
/*
|
|
* reject anything that look suspicious. the test is implemented
|
|
* in ip6_input too, but we check here as well to
|
|
* (1) reject bad packets earlier, and
|
|
* (2) to be safe against future ip6_input change.
|
|
*/
|
|
if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
in_stf_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
struct stf_softc *sc;
|
|
struct ip *ip;
|
|
struct ip6_hdr *ip6;
|
|
struct mbuf *m;
|
|
u_int8_t otos, itos;
|
|
struct ifnet *ifp;
|
|
int off;
|
|
|
|
m = *mp;
|
|
off = *offp;
|
|
|
|
if (proto != IPPROTO_IPV6) {
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
ip = mtod(m, struct ip *);
|
|
|
|
sc = (struct stf_softc *)encap_getarg(m);
|
|
|
|
if (sc == NULL || (STF2IFP(sc)->if_flags & IFF_UP) == 0) {
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
ifp = STF2IFP(sc);
|
|
|
|
#ifdef MAC
|
|
mac_ifnet_create_mbuf(ifp, m);
|
|
#endif
|
|
|
|
/*
|
|
* perform sanity check against outer src/dst.
|
|
* for source, perform ingress filter as well.
|
|
*/
|
|
if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
|
|
stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) {
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
otos = ip->ip_tos;
|
|
m_adj(m, off);
|
|
|
|
if (m->m_len < sizeof(*ip6)) {
|
|
m = m_pullup(m, sizeof(*ip6));
|
|
if (!m)
|
|
return (IPPROTO_DONE);
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
/*
|
|
* perform sanity check against inner src/dst.
|
|
* for source, perform ingress filter as well.
|
|
*/
|
|
if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
|
|
stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) {
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
|
|
if ((ifp->if_flags & IFF_LINK1) != 0)
|
|
ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
|
|
else
|
|
ip_ecn_egress(ECN_NOCARE, &otos, &itos);
|
|
ip6->ip6_flow &= ~htonl(0xff << 20);
|
|
ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
|
|
if (bpf_peers_present(ifp->if_bpf)) {
|
|
/*
|
|
* We need to prepend the address family as
|
|
* a four byte field. Cons up a dummy header
|
|
* to pacify bpf. This is safe because bpf
|
|
* will only read from the mbuf (i.e., it won't
|
|
* try to free it or keep a pointer a to it).
|
|
*/
|
|
u_int32_t af = AF_INET6;
|
|
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
|
|
}
|
|
|
|
/*
|
|
* Put the packet to the network layer input queue according to the
|
|
* specified address family.
|
|
* See net/if_gif.c for possible issues with packet processing
|
|
* reorder due to extra queueing.
|
|
*/
|
|
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
|
|
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
|
|
M_SETFIB(m, ifp->if_fib);
|
|
netisr_dispatch(NETISR_IPV6, m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
static int
|
|
stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
struct ifaddr *ifa;
|
|
struct ifreq *ifr;
|
|
struct sockaddr_in6 *sin6;
|
|
struct in_addr addr;
|
|
int error, mtu;
|
|
|
|
error = 0;
|
|
switch (cmd) {
|
|
case SIOCSIFADDR:
|
|
ifa = (struct ifaddr *)data;
|
|
if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
|
|
if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr));
|
|
if (isrfc1918addr(&addr)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
ifp->if_flags |= IFF_UP;
|
|
break;
|
|
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
ifr = (struct ifreq *)data;
|
|
if (ifr && ifr->ifr_addr.sa_family == AF_INET6)
|
|
;
|
|
else
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
|
|
case SIOCGIFMTU:
|
|
break;
|
|
|
|
case SIOCSIFMTU:
|
|
ifr = (struct ifreq *)data;
|
|
mtu = ifr->ifr_mtu;
|
|
/* RFC 4213 3.2 ideal world MTU */
|
|
if (mtu < IPV6_MINMTU || mtu > IF_MAXMTU - 20)
|
|
return (EINVAL);
|
|
ifp->if_mtu = mtu;
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
}
|