Author: bz
Date: Wed Mar 6 23:31:42 2019
New Revision: 344859
URL: https://svnweb.freebsd.org/changeset/base/344859
Log:
Update for IETF draft-ietf-6man-ipv6only-flag.
All changes are hidden behind the EXPERIMENTAL option and are not compiled
in by default.
Add ND6_IFF_IPV6_ONLY_MANUAL to be able to set the interface into no-IPv4-mode
manually without router advertisement options. This will allow developers to
test software for the appropriate behaviour even on dual-stack networks or
IPv6-Only networks without the option being set in RA messages.
Update ifconfig to allow setting and displaying the flag.
Update the checks for the filters to check for either the automatic or the
manual
flag to be set. Add REVARP to the list of filtered IPv4-related protocols
and add
an input filter similar to the output filter.
Add a check, when receiving the IPv6-Only RA flag to see if the receiving
interface has any IPv4 configured. If it does, ignore the IPv6-Only flag.
Add a per-VNET global sysctl, which is on by default, to not process the
automatic
RA IPv6-Only flag. This way an administrator (if this is compiled in) has
control
over the behaviour in case the node still relies on IPv4.
Modified:
head/sbin/ifconfig/Makefile
head/sbin/ifconfig/af_inet6.c
head/sbin/ifconfig/af_nd6.c
head/sys/net/if_ethersubr.c
head/sys/netinet6/in6_proto.c
head/sys/netinet6/ip6_var.h
head/sys/netinet6/nd6.h
head/sys/netinet6/nd6_rtr.c
Modified: head/sbin/ifconfig/Makefile
==============================================================================
--- head/sbin/ifconfig/Makefile Wed Mar 6 23:09:27 2019 (r344858)
+++ head/sbin/ifconfig/Makefile Wed Mar 6 23:31:42 2019 (r344859)
@@ -55,6 +55,7 @@ SRCS+= iflagg.c # lagg support
.if ${MK_EXPERIMENTAL} != "no"
CFLAGS+= -DDRAFT_IETF_6MAN_IPV6ONLY_FLAG
+CFLAGS+= -DEXPERIMENTAL
.endif
.if ${MK_INET6_SUPPORT} != "no"
CFLAGS+= -DINET6
Modified: head/sbin/ifconfig/af_inet6.c
==============================================================================
--- head/sbin/ifconfig/af_inet6.c Wed Mar 6 23:09:27 2019
(r344858)
+++ head/sbin/ifconfig/af_inet6.c Wed Mar 6 23:31:42 2019
(r344859)
@@ -505,6 +505,10 @@ static struct cmd inet6_cmds[] = {
DEF_CMD_ARG("pltime", setip6pltime),
DEF_CMD_ARG("vltime", setip6vltime),
DEF_CMD("eui64", 0, setip6eui64),
+#ifdef EXPERIMENTAL
+ DEF_CMD("ipv6_only", ND6_IFF_IPV6_ONLY_MANUAL,setnd6flags),
+ DEF_CMD("-ipv6_only", -ND6_IFF_IPV6_ONLY_MANUAL,setnd6flags),
+#endif
};
static struct afswtch af_inet6 = {
Modified: head/sbin/ifconfig/af_nd6.c
==============================================================================
--- head/sbin/ifconfig/af_nd6.c Wed Mar 6 23:09:27 2019 (r344858)
+++ head/sbin/ifconfig/af_nd6.c Wed Mar 6 23:31:42 2019 (r344859)
@@ -61,7 +61,7 @@ static const char rcsid[] =
#define ND6BITS "\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
"\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
"\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD" \
- "\012IPV6_ONLY" \
+ "\012IPV6_ONLY\013IPV6_ONLY_MANUAL" \
"\020DEFAULTIF"
#else
#define ND6BITS "\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
Modified: head/sys/net/if_ethersubr.c
==============================================================================
--- head/sys/net/if_ethersubr.c Wed Mar 6 23:09:27 2019 (r344858)
+++ head/sys/net/if_ethersubr.c Wed Mar 6 23:31:42 2019 (r344859)
@@ -476,14 +476,15 @@ ether_output_frame(struct ifnet *ifp, struct mbuf *m)
#ifdef EXPERIMENTAL
#if defined(INET6) && defined(INET)
/* draft-ietf-6man-ipv6only-flag */
- /* Catch ETHERTYPE_IP, and ETHERTYPE_ARP if we are v6-only. */
- if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY) != 0) {
+ /* Catch ETHERTYPE_IP, and ETHERTYPE_[REV]ARP if we are v6-only. */
+ if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY_MASK) != 0) {
struct ether_header *eh;
eh = mtod(m, struct ether_header *);
switch (ntohs(eh->ether_type)) {
case ETHERTYPE_IP:
case ETHERTYPE_ARP:
+ case ETHERTYPE_REVARP:
m_freem(m);
return (EAFNOSUPPORT);
/* NOTREACHED */
@@ -533,6 +534,25 @@ ether_input_internal(struct ifnet *ifp, struct mbuf *m
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
random_harvest_queue_ether(m, sizeof(*m));
+
+#ifdef EXPERIMENTAL
+#if defined(INET6) && defined(INET)
+ /* draft-ietf-6man-ipv6only-flag */
+ /* Catch ETHERTYPE_IP, and ETHERTYPE_[REV]ARP if we are v6-only. */
+ if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY_MASK) != 0) {
+
+ switch (etype) {
+ case ETHERTYPE_IP:
+ case ETHERTYPE_ARP:
+ case ETHERTYPE_REVARP:
+ m_freem(m);
+ return;
+ /* NOTREACHED */
+ break;
+ };
+ }
+#endif
+#endif
CURVNET_SET_QUIET(ifp->if_vnet);
Modified: head/sys/netinet6/in6_proto.c
==============================================================================
--- head/sys/netinet6/in6_proto.c Wed Mar 6 23:09:27 2019
(r344858)
+++ head/sys/netinet6/in6_proto.c Wed Mar 6 23:31:42 2019
(r344859)
@@ -641,3 +641,10 @@ SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC
nd6_onlink_ns_rfc4861, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(nd6_onlink_ns_rfc4861), 0,
"Accept 'on-link' ICMPv6 NS messages in compliance with RFC 4861");
+#ifdef EXPERIMENTAL
+SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
+ nd6_ignore_ipv6_only_ra, CTLFLAG_VNET | CTLFLAG_RW,
+ &VNET_NAME(nd6_ignore_ipv6_only_ra), 0,
+ "Ignore the 'IPv6-Only flag' in RA messages in compliance with "
+ "draft-ietf-6man-ipv6only-flag");
+#endif
Modified: head/sys/netinet6/ip6_var.h
==============================================================================
--- head/sys/netinet6/ip6_var.h Wed Mar 6 23:09:27 2019 (r344858)
+++ head/sys/netinet6/ip6_var.h Wed Mar 6 23:31:42 2019 (r344859)
@@ -355,6 +355,11 @@ VNET_DECLARE(int, ip6stealth);
#define V_ip6stealth VNET(ip6stealth)
#endif
+#ifdef EXPERIMENTAL
+VNET_DECLARE(int, nd6_ignore_ipv6_only_ra);
+#define V_nd6_ignore_ipv6_only_ra VNET(nd6_ignore_ipv6_only_ra)
+#endif
+
extern struct pr_usrreqs rip6_usrreqs;
struct sockopt;
Modified: head/sys/netinet6/nd6.h
==============================================================================
--- head/sys/netinet6/nd6.h Wed Mar 6 23:09:27 2019 (r344858)
+++ head/sys/netinet6/nd6.h Wed Mar 6 23:31:42 2019 (r344859)
@@ -91,7 +91,10 @@ struct nd_ifinfo {
#define ND6_IFF_NO_PREFER_IFACE 0x80 /* XXX: not related to ND. */
#define ND6_IFF_NO_DAD 0x100
#ifdef EXPERIMENTAL
+/* XXX: not related to ND. */
#define ND6_IFF_IPV6_ONLY 0x200 /* draft-ietf-6man-ipv6only-flag
*/
+#define ND6_IFF_IPV6_ONLY_MANUAL 0x400
+#define ND6_IFF_IPV6_ONLY_MASK
(ND6_IFF_IPV6_ONLY|ND6_IFF_IPV6_ONLY_MANUAL)
#endif
#ifdef _KERNEL
Modified: head/sys/netinet6/nd6_rtr.c
==============================================================================
--- head/sys/netinet6/nd6_rtr.c Wed Mar 6 23:09:27 2019 (r344858)
+++ head/sys/netinet6/nd6_rtr.c Wed Mar 6 23:31:42 2019 (r344859)
@@ -106,6 +106,10 @@ VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_
VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
+#ifdef EXPERIMENTAL
+VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1;
+#endif
+
/* RTPREF_MEDIUM has to be 0! */
#define RTPREF_HIGH 1
#define RTPREF_MEDIUM 0
@@ -208,7 +212,7 @@ nd6_rs_input(struct mbuf *m, int off, int icmp6len)
/*
* An initial update routine for draft-ietf-6man-ipv6only-flag.
* We need to iterate over all default routers for the given
- * interface to see whether they are all advertising the "6"
+ * interface to see whether they are all advertising the "S"
* (IPv6-Only) flag. If they do set, otherwise unset, the
* interface flag we later use to filter on.
*/
@@ -216,8 +220,16 @@ static void
defrtr_ipv6_only_ifp(struct ifnet *ifp)
{
struct nd_defrouter *dr;
- bool ipv6_only;
+ bool ipv6_only, ipv6_only_old;
+#ifdef INET
+ struct epoch_tracker et;
+ struct ifaddr *ifa;
+ bool has_ipv4_addr;
+#endif
+ if (V_nd6_ignore_ipv6_only_ra != 0)
+ return;
+
ipv6_only = true;
ND6_RLOCK();
TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
@@ -227,13 +239,53 @@ defrtr_ipv6_only_ifp(struct ifnet *ifp)
ND6_RUNLOCK();
IF_AFDATA_WLOCK(ifp);
+ ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY;
+ IF_AFDATA_WUNLOCK(ifp);
+
+ /* If nothing changed, we have an early exit. */
+ if (ipv6_only == ipv6_only_old)
+ return;
+
+#ifdef INET
+ /*
+ * Should we want to set the IPV6-ONLY flag, check if the
+ * interface has a non-0/0 and non-link-local IPv4 address
+ * configured on it. If it has we will assume working
+ * IPv4 operations and will clear the interface flag.
+ */
+ has_ipv4_addr = false;
+ if (ipv6_only) {
+ NET_EPOCH_ENTER(et);
+ CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+ if (ifa->ifa_addr->sa_family != AF_INET)
+ continue;
+ if (in_canforward(
+ satosin(ifa->ifa_addr)->sin_addr)) {
+ has_ipv4_addr = true;
+ break;
+ }
+ }
+ NET_EPOCH_EXIT(et);
+ }
+ if (ipv6_only && has_ipv4_addr) {
+ log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 "
+ "configured, ignoring IPv6-Only flag.\n", ifp->if_xname);
+ ipv6_only = false;
+ }
+#endif
+
+ IF_AFDATA_WLOCK(ifp);
if (ipv6_only)
ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY;
else
ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY;
IF_AFDATA_WUNLOCK(ifp);
-}
+
+#ifdef notyet
+ /* Send notification of flag change. */
#endif
+}
+#endif /* EXPERIMENTAL */
/*
* Receive Router Advertisement Message.
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