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-rw-r--r--sys/net/if_stf.c648
1 files changed, 535 insertions, 113 deletions
diff --git a/sys/net/if_stf.c b/sys/net/if_stf.c
index 5209bc8..4f6dfd9 100644
--- a/sys/net/if_stf.c
+++ b/sys/net/if_stf.c
@@ -3,6 +3,9 @@
/*-
* Copyright (C) 2000 WIDE Project.
+ * Copyright (c) 2010 Hiroki Sato <hrs@FreeBSD.org>
+ * Copyright (c) 2013 Ermal Luçi <eri@FreeBSD.org>
+ * Copyright (c) 2017 Rubicon Communications, LLC (Netgate)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -31,7 +34,7 @@
*/
/*
- * 6to4 interface, based on RFC3056.
+ * 6to4 interface, based on RFC3056 + 6rd (RFC5569) support.
*
* 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting.
* There is no address mapping defined from IPv6 multicast address to IPv4
@@ -60,7 +63,7 @@
* ICMPv6:
* - Redirects cannot be used due to the lack of link-local address.
*
- * stf interface does not have, and will not need, a link-local address.
+ * stf interface does not have, and will not need, a link-local address.
* It seems to have no real benefit and does not help the above symptoms much.
* Even if we assign link-locals to interface, we cannot really
* use link-local unicast/multicast on top of 6to4 cloud (since there's no
@@ -72,6 +75,12 @@
* http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt
* for details. The code tries to filter out some of malicious packets.
* Note that there is no way to be 100% secure.
+ *
+ * 6rd (RFC5569 & RFC5969) extension is enabled when an IPv6 GUA other than
+ * 2002::/16 is assigned. The stf(4) recognizes a 32-bit just after
+ * prefixlen as the IPv4 address of the 6rd customer site. The
+ * prefixlen must be shorter than 32.
+ *
*/
#include <sys/param.h>
@@ -83,6 +92,7 @@
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
+#include <sys/priv.h>
#include <sys/protosw.h>
#include <sys/proc.h>
#include <sys/queue.h>
@@ -106,8 +116,10 @@
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>
+#include <net/if_stf.h>
#include <netinet/ip6.h>
+#include <netinet6/in6_fib.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_var.h>
#include <netinet/ip_ecn.h>
@@ -120,15 +132,41 @@
#include <security/mac/mac_framework.h>
+#define STF_DEBUG 1
+#if STF_DEBUG > 3
+#define ip_sprintf(buf, a) \
+ sprintf(buf, "%u.%u.%u.%u", \
+ (ntohl((a)->s_addr)>>24)&0xFF, \
+ (ntohl((a)->s_addr)>>16)&0xFF, \
+ (ntohl((a)->s_addr)>>8)&0xFF, \
+ (ntohl((a)->s_addr))&0xFF);
+#endif
+
+#if STF_DEBUG
+#define DEBUG_PRINTF(a, ...) \
+ do { \
+ if (V_stf_debug >= a) \
+ printf(__VA_ARGS__); \
+ } while (0)
+#else
+#define DEBUG_PRINTF(a, ...)
+#endif
+
SYSCTL_DECL(_net_link);
static SYSCTL_NODE(_net_link, IFT_STF, stf, CTLFLAG_RW, 0, "6to4 Interface");
+#if STF_DEBUG
+static VNET_DEFINE(int, stf_debug) = 0;
+#define V_stf_debug VNET(stf_debug)
+SYSCTL_INT(_net_link_stf, OID_AUTO, stf_debug, CTLFLAG_VNET | CTLFLAG_RW,
+ &VNET_NAME(stf_debug), 0,
+ "Enable displaying debug messages of stf interfaces");
+#endif
+
static int stf_permit_rfc1918 = 0;
SYSCTL_INT(_net_link_stf, OID_AUTO, permit_rfc1918, CTLFLAG_RWTUN,
&stf_permit_rfc1918, 0, "Permit the use of private IPv4 addresses");
-#define STFUNIT 0
-
#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
/*
@@ -139,9 +177,13 @@ SYSCTL_INT(_net_link_stf, OID_AUTO, permit_rfc1918, CTLFLAG_RWTUN,
struct stf_softc {
struct ifnet *sc_ifp;
- struct mtx sc_ro_mtx;
+ in_addr_t inaddr;
+ in_addr_t dstv4_addr;
+ in_addr_t srcv4_addr;
+ u_int v4prefixlen;
u_int sc_fibnum;
const struct encaptab *encap_cookie;
+ LIST_ENTRY(stf_softc) stf_list;
};
#define STF2IFP(sc) ((sc)->sc_ifp)
@@ -151,7 +193,11 @@ static const char stfname[] = "stf";
* Note that mutable fields in the softc are not currently locked.
* We do lock sc_ro in stf_output though.
*/
+static struct mtx stf_mtx;
static MALLOC_DEFINE(M_STF, stfname, "6to4 Tunnel Interface");
+static VNET_DEFINE(LIST_HEAD(, stf_softc), stf_softc_list);
+#define V_stf_softc_list VNET(stf_softc_list)
+
static const int ip_stf_ttl = 40;
extern struct domain inetdomain;
@@ -167,8 +213,6 @@ static struct protosw in_stf_protosw = {
.pr_usrreqs = &rip_usrreqs
};
-static char *stfnames[] = {"stf0", "stf", "6to4", NULL};
-
static int stfmodevent(module_t, int, void *);
static int stf_encapcheck(const struct mbuf *, int, int, void *);
static int stf_getsrcifa6(struct ifnet *, struct in6_addr *, struct in6_addr *);
@@ -179,68 +223,39 @@ static int stf_checkaddr4(struct stf_softc *, struct in_addr *,
struct ifnet *);
static int stf_checkaddr6(struct stf_softc *, struct in6_addr *,
struct ifnet *);
+static struct sockaddr_in *stf_getin4addr_in6(struct stf_softc *,
+ struct sockaddr_in *, struct in6_addr, struct in6_addr,
+ struct in6_addr);
+static struct sockaddr_in *stf_getin4addr(struct stf_softc *,
+ struct sockaddr_in *, struct in6_addr, struct in6_addr);
static int stf_ioctl(struct ifnet *, u_long, caddr_t);
-static int stf_clone_match(struct if_clone *, const char *);
-static int stf_clone_create(struct if_clone *, char *, size_t, caddr_t);
-static int stf_clone_destroy(struct if_clone *, struct ifnet *);
+static int stf_clone_create(struct if_clone *, int, caddr_t);
+static void stf_clone_destroy(struct ifnet *);
static struct if_clone *stf_cloner;
static int
-stf_clone_match(struct if_clone *ifc, const char *name)
+stf_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
- int i;
-
- for(i = 0; stfnames[i] != NULL; i++) {
- if (strcmp(stfnames[i], name) == 0)
- return (1);
- }
-
- return (0);
-}
-
-static int
-stf_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
-{
- int err, unit;
struct stf_softc *sc;
struct ifnet *ifp;
- /*
- * We can only have one unit, but since unit allocation is
- * already locked, we use it to keep from allocating extra
- * interfaces.
- */
- unit = STFUNIT;
- err = ifc_alloc_unit(ifc, &unit);
- if (err != 0)
- return (err);
-
sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO);
ifp = STF2IFP(sc) = if_alloc(IFT_STF);
if (ifp == NULL) {
free(sc, M_STF);
- ifc_free_unit(ifc, unit);
return (ENOSPC);
}
ifp->if_softc = sc;
sc->sc_fibnum = curthread->td_proc->p_fibnum;
+ if_initname(ifp, stfname, unit);
- /*
- * Set the name manually rather then using if_initname because
- * we don't conform to the default naming convention for interfaces.
- */
- strlcpy(ifp->if_xname, name, IFNAMSIZ);
- ifp->if_dname = stfname;
- ifp->if_dunit = IF_DUNIT_NONE;
-
- mtx_init(&(sc)->sc_ro_mtx, "stf ro", NULL, MTX_DEF);
sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6,
stf_encapcheck, &in_stf_protosw, sc);
if (sc->encap_cookie == NULL) {
if_printf(ifp, "attach failed\n");
+ if_free(ifp);
free(sc, M_STF);
- ifc_free_unit(ifc, unit);
return (ENOMEM);
}
@@ -250,39 +265,56 @@ stf_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
ifp->if_snd.ifq_maxlen = ifqmaxlen;
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
+
+ mtx_lock(&stf_mtx);
+ LIST_INSERT_HEAD(&V_stf_softc_list, sc, stf_list);
+ mtx_unlock(&stf_mtx);
+
return (0);
}
-static int
-stf_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
+static void
+stf_clone_destroy(struct ifnet *ifp)
{
struct stf_softc *sc = ifp->if_softc;
int err;
+ mtx_lock(&stf_mtx);
+ LIST_REMOVE(sc, stf_list);
+ mtx_unlock(&stf_mtx);
+
err = encap_detach(sc->encap_cookie);
KASSERT(err == 0, ("Unexpected error detaching encap_cookie"));
- mtx_destroy(&(sc)->sc_ro_mtx);
bpfdetach(ifp);
if_detach(ifp);
if_free(ifp);
free(sc, M_STF);
- ifc_free_unit(ifc, STFUNIT);
+}
- return (0);
+static void
+vnet_stf_init(const void *unused __unused)
+{
+
+ LIST_INIT(&V_stf_softc_list);
}
+VNET_SYSINIT(vnet_stf_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, vnet_stf_init,
+ NULL);
+
static int
stfmodevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
- stf_cloner = if_clone_advanced(stfname, 0, stf_clone_match,
- stf_clone_create, stf_clone_destroy);
+ mtx_init(&stf_mtx, "stf_mtx", NULL, MTX_DEF);
+ stf_cloner = if_clone_simple(stfname,
+ stf_clone_create, stf_clone_destroy, 0);
break;
case MOD_UNLOAD:
if_clone_detach(stf_cloner);
+ mtx_destroy(&stf_mtx);
break;
default:
return (EOPNOTSUPP);
@@ -298,60 +330,125 @@ static moduledata_t stf_mod = {
};
DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+MODULE_VERSION(if_stf, 1);
static int
stf_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
{
struct ip ip;
struct stf_softc *sc;
- struct in_addr a, b, mask;
struct in6_addr addr6, mask6;
+ struct sockaddr_in sin4addr, sin4mask;
+ DEBUG_PRINTF(1, "%s: enter\n", __func__);
sc = (struct stf_softc *)arg;
if (sc == NULL)
- return 0;
+ return (0);
if ((STF2IFP(sc)->if_flags & IFF_UP) == 0)
- return 0;
+ return (0);
/* IFF_LINK0 means "no decapsulation" */
if ((STF2IFP(sc)->if_flags & IFF_LINK0) != 0)
- return 0;
+ return (0);
if (proto != IPPROTO_IPV6)
- return 0;
+ return (0);
/* LINTED const cast */
m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip);
if (ip.ip_v != 4)
- return 0;
+ return (0);
if (stf_getsrcifa6(STF2IFP(sc), &addr6, &mask6) != 0)
return (0);
+ if (sc->srcv4_addr != INADDR_ANY) {
+ sin4addr.sin_addr.s_addr = sc->srcv4_addr;
+ sin4addr.sin_family = AF_INET;
+ } else
+ if (stf_getin4addr(sc, &sin4addr, addr6, mask6) == NULL)
+ return (0);
+
+#if STF_DEBUG > 3
+ {
+ char buf[INET6_ADDRSTRLEN + 1];
+ memset(&buf, 0, sizeof(buf));
+
+ ip6_sprintf(buf, &addr6);
+ DEBUG_PRINTF(1, "%s: addr6 = %s\n", __func__, buf);
+ ip6_sprintf(buf, &mask6);
+ DEBUG_PRINTF(1, "%s: mask6 = %s\n", __func__, buf);
+
+ ip_sprintf(buf, &sin4addr.sin_addr);
+ DEBUG_PRINTF(1, "%s: sin4addr.sin_addr = %s\n", __func__, buf);
+ ip_sprintf(buf, &ip.ip_src);
+ DEBUG_PRINTF(1, "%s: ip.ip_src = %s\n", __func__, buf);
+ ip_sprintf(buf, &ip.ip_dst);
+ DEBUG_PRINTF(1, "%s: ip.ip_dst = %s\n", __func__, buf);
+ }
+#endif
+
/*
* check if IPv4 dst matches the IPv4 address derived from the
* local 6to4 address.
* success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
*/
- if (bcmp(GET_V4(&addr6), &ip.ip_dst, sizeof(ip.ip_dst)) != 0)
- return 0;
+ if (sin4addr.sin_addr.s_addr != ip.ip_dst.s_addr) {
+ DEBUG_PRINTF(1,
+ "%s: IPv4 dst address do not match the encoded address. "
+ "Ignore this packet.\n", __func__);
+ return (0);
+ }
- /*
- * check if IPv4 src matches the IPv4 address derived from the
- * local 6to4 address masked by prefixmask.
- * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
- * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
- */
- bzero(&a, sizeof(a));
- bcopy(GET_V4(&addr6), &a, sizeof(a));
- bcopy(GET_V4(&mask6), &mask, sizeof(mask));
- a.s_addr &= mask.s_addr;
- b = ip.ip_src;
- b.s_addr &= mask.s_addr;
- if (a.s_addr != b.s_addr)
- return 0;
+ if (IN6_IS_ADDR_6TO4(&addr6)) {
+ /*
+ * 6to4 (RFC 3056).
+ * Check if IPv4 src matches the IPv4 address derived
+ * from the local 6to4 address masked by prefixmask.
+ * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
+ * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
+ */
+
+ memcpy(&sin4mask.sin_addr, GET_V4(&mask6), sizeof(sin4mask));
+#if STF_DEBUG > 3
+ {
+ char buf[INET6_ADDRSTRLEN + 1];
+ memset(&buf, 0, sizeof(buf));
+
+ ip_sprintf(buf, &sin4addr.sin_addr);
+ DEBUG_PRINTF(1, "%s: sin4addr = %s\n",
+ __func__, buf);
+ ip_sprintf(buf, &ip.ip_src);
+ DEBUG_PRINTF(1, "%s: ip.ip_src = %s\n",
+ __func__, buf);
+ ip_sprintf(buf, &sin4mask.sin_addr);
+ DEBUG_PRINTF(1, "%s: sin4mask = %s\n",
+ __func__, buf);
+ }
+#endif
+
+ if ((sin4addr.sin_addr.s_addr & sin4mask.sin_addr.s_addr) !=
+ (ip.ip_src.s_addr & sin4mask.sin_addr.s_addr)) {
+ DEBUG_PRINTF(1,
+ "%s: v4 address do not match expected address. "
+ "Ignore this packet.\n", __func__);
+ return (0);
+ }
+ } else {
+ /* 6rd (RFC 5569) */
+ /*
+ * No restriction on the src address in the case of
+ * 6rd because the stf(4) interface always has a
+ * prefix which covers whole of IPv4 src address
+ * range. So, stf_output() will catch all of
+ * 6rd-capsuled IPv4 traffic with suspicious inner dst
+ * IPv4 address (i.e. the IPv6 destination address is
+ * one the admin does not like to route to outside),
+ * and then it discard them silently.
+ */
+ }
/* stf interface makes single side match only */
return 32;
@@ -362,29 +459,50 @@ stf_getsrcifa6(struct ifnet *ifp, struct in6_addr *addr, struct in6_addr *mask)
{
struct ifaddr *ia;
struct in_ifaddr *ia4;
+ struct in6_addr addr6, mask6;
struct in6_ifaddr *ia6;
- struct sockaddr_in6 *sin6;
+ struct sockaddr_in sin4;
+ struct stf_softc *sc;
struct in_addr in;
+ sc = ifp->if_softc;
if_addr_rlock(ifp);
TAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) {
if (ia->ifa_addr->sa_family != AF_INET6)
continue;
- sin6 = (struct sockaddr_in6 *)ia->ifa_addr;
- if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
- continue;
+ ia6 = (struct in6_ifaddr *)ia;
+ *&addr6 = ((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr;
+ *&mask6 = ia6->ia_prefixmask.sin6_addr;
+ if (sc->srcv4_addr != INADDR_ANY)
+ bcopy(&sc->srcv4_addr, &in, sizeof(in));
+ else {
+ if (stf_getin4addr(sc, &sin4, addr6, mask6) == NULL)
+ continue;
+ bcopy(&sin4.sin_addr, &in, sizeof(in));
+ }
- bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash)
if (ia4->ia_addr.sin_addr.s_addr == in.s_addr)
break;
if (ia4 == NULL)
continue;
- ia6 = (struct in6_ifaddr *)ia;
+#if STF_DEBUG > 3
+ {
+ char buf[INET6_ADDRSTRLEN + 1];
+ memset(&buf, 0, sizeof(buf));
+
+ ip6_sprintf(buf, &((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr);
+ DEBUG_PRINTF(1, "%s: ia->ifa_addr->sin6_addr = %s\n",
+ __func__, buf);
+ ip_sprintf(buf, &ia4->ia_addr.sin_addr);
+ DEBUG_PRINTF(1, "%s: ia4->ia_addr.sin_addr = %s\n",
+ __func__, buf);
+ }
+#endif
- *addr = sin6->sin6_addr;
- *mask = ia6->ia_prefixmask.sin6_addr;
+ *addr = addr6;
+ *mask = mask6;
if_addr_runlock(ifp);
return (0);
}
@@ -399,8 +517,7 @@ stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
{
struct stf_softc *sc;
const struct sockaddr_in6 *dst6;
- struct in_addr in4;
- const void *ptr;
+ struct sockaddr_in dst4, src4;
u_int8_t tos;
struct ip *ip;
struct ip6_hdr *ip6;
@@ -450,18 +567,27 @@ stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
* Pickup the right outer dst addr from the list of candidates.
* ip6_dst has priority as it may be able to give us shorter IPv4 hops.
*/
- ptr = NULL;
- if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
- ptr = GET_V4(&ip6->ip6_dst);
- else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
- ptr = GET_V4(&dst6->sin6_addr);
- else {
- m_freem(m);
- if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
- return ENETUNREACH;
+ DEBUG_PRINTF(1, "%s: dst addr selection\n", __func__);
+ if (stf_getin4addr_in6(sc, &dst4, addr6, mask6,
+ ip6->ip6_dst) == NULL) {
+ if (sc->dstv4_addr != INADDR_ANY)
+ dst4.sin_addr.s_addr = sc->dstv4_addr;
+ else if (stf_getin4addr_in6(sc, &dst4, addr6, mask6,
+ dst6->sin6_addr) == NULL) {
+ m_freem(m);
+ if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
+ return (ENETUNREACH);
+ }
}
- bcopy(ptr, &in4, sizeof(in4));
+#if STF_DEBUG > 3
+ {
+ char buf[INET6_ADDRSTRLEN + 1];
+ memset(&buf, 0, sizeof(buf));
+ ip_sprintf(buf, &dst4.sin_addr);
+ DEBUG_PRINTF(1, "%s: ip_dst = %s\n", __func__, buf);
+ }
+#endif
if (bpf_peers_present(ifp->if_bpf)) {
/*
* We need to prepend the address family as
@@ -483,8 +609,24 @@ stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
bzero(ip, sizeof(*ip));
- bcopy(GET_V4(&addr6), &ip->ip_src, sizeof(ip->ip_src));
- bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst));
+ if (sc->srcv4_addr != INADDR_ANY)
+ src4.sin_addr.s_addr = sc->srcv4_addr;
+ else if (stf_getin4addr(sc, &src4, addr6, mask6) == NULL) {
+ m_freem(m);
+ if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
+ return (ENETUNREACH);
+ }
+ bcopy(&src4.sin_addr, &ip->ip_src, sizeof(ip->ip_src));
+#if STF_DEBUG > 3
+ {
+ char buf[INET6_ADDRSTRLEN + 1];
+ memset(&buf, 0, sizeof(buf));
+
+ ip_sprintf(buf, &ip->ip_src);
+ DEBUG_PRINTF(1, "%s: ip_src = %s\n", __func__, buf);
+ }
+#endif
+ bcopy(&dst4.sin_addr, &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);
@@ -534,13 +676,6 @@ stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, struct ifnet *inifp)
}
/*
- * 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);
@@ -603,6 +738,7 @@ in_stf_input(struct mbuf **mp, int *offp, int proto)
struct mbuf *m;
u_int8_t otos, itos;
struct ifnet *ifp;
+ struct nhop6_basic nh6;
int off;
m = *mp;
@@ -628,6 +764,17 @@ in_stf_input(struct mbuf **mp, int *offp, int proto)
mac_ifnet_create_mbuf(ifp, m);
#endif
+#if STF_DEBUG > 3
+ {
+ char buf[INET6_ADDRSTRLEN + 1];
+ memset(&buf, 0, sizeof(buf));
+
+ ip_sprintf(buf, &ip->ip_dst);
+ DEBUG_PRINTF(1, "%s: ip->ip_dst = %s\n", __func__, buf);
+ ip_sprintf(buf, &ip->ip_src);
+ DEBUG_PRINTF(1, "%s: ip->ip_src = %s\n", __func__, buf);
+ }
+#endif
/*
* perform sanity check against outer src/dst.
* for source, perform ingress filter as well.
@@ -648,6 +795,17 @@ in_stf_input(struct mbuf **mp, int *offp, int proto)
}
ip6 = mtod(m, struct ip6_hdr *);
+#if STF_DEBUG > 3
+ {
+ char buf[INET6_ADDRSTRLEN + 1];
+ memset(&buf, 0, sizeof(buf));
+
+ ip6_sprintf(buf, &ip6->ip6_dst);
+ DEBUG_PRINTF(1, "%s: ip6->ip6_dst = %s\n", __func__, buf);
+ ip6_sprintf(buf, &ip6->ip6_src);
+ DEBUG_PRINTF(1, "%s: ip6->ip6_src = %s\n", __func__, buf);
+ }
+#endif
/*
* perform sanity check against inner src/dst.
* for source, perform ingress filter as well.
@@ -658,6 +816,35 @@ in_stf_input(struct mbuf **mp, int *offp, int proto)
return (IPPROTO_DONE);
}
+ /*
+ * reject packets with private address range.
+ * (requirement from RFC3056 section 2 1st paragraph)
+ */
+ if ((IN6_IS_ADDR_6TO4(&ip6->ip6_src) && isrfc1918addr(&ip->ip_src)) ||
+ (IN6_IS_ADDR_6TO4(&ip6->ip6_dst) && isrfc1918addr(&ip->ip_dst))) {
+ m_freem(m);
+ return (IPPROTO_DONE);
+ }
+
+ /*
+ * Ignore if the destination is the same stf interface because
+ * all of valid IPv6 outgoing traffic should go interfaces
+ * except for it.
+ */
+ if (fib6_lookup_nh_basic(sc->sc_fibnum,
+ &ip6->ip6_dst, 0, 0, 0, &nh6) != 0) {
+ DEBUG_PRINTF(1, "%s: no IPv6 dst. Ignored.\n", __func__);
+ m_free(m);
+ return (IPPROTO_DONE);
+ }
+ if ((nh6.nh_ifp == ifp) &&
+ (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &nh6.nh_addr))) {
+ DEBUG_PRINTF(1, "%s: IPv6 dst is the same stf. Ignored.\n",
+ __func__);
+ m_free(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);
@@ -667,7 +854,7 @@ in_stf_input(struct mbuf **mp, int *offp, int proto)
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
@@ -680,6 +867,7 @@ in_stf_input(struct mbuf **mp, int *offp, int proto)
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
}
+ DEBUG_PRINTF(1, "%s: netisr_dispatch(NETISR_IPV6)\n", __func__);
/*
* Put the packet to the network layer input queue according to the
* specified address family.
@@ -693,35 +881,262 @@ in_stf_input(struct mbuf **mp, int *offp, int proto)
return (IPPROTO_DONE);
}
+static struct sockaddr_in *
+stf_getin4addr_in6(struct stf_softc *sc, struct sockaddr_in *sin,
+ struct in6_addr addr6, struct in6_addr mask6, struct in6_addr in6)
+{
+ int i;
+
+#if STF_DEBUG > 3
+ {
+ char buf[INET6_ADDRSTRLEN + 1];
+ memset(&buf, 0, sizeof(buf));
+
+ ip6_sprintf(buf, &in6);
+ DEBUG_PRINTF(1, "%s: in6 = %s\n", __func__, buf);
+ ip6_sprintf(buf, &addr6);
+ DEBUG_PRINTF(1, "%s: addr6 = %s\n", __func__, buf);
+ ip6_sprintf(buf, &mask6);
+ DEBUG_PRINTF(1, "%s: mask6 = %s\n", __func__, buf);
+ }
+#endif
+
+ /*
+ * When (src addr & src mask) != (in6 & src mask),
+ * the dst is not in the 6rd domain. The IPv4 address must
+ * not be used.
+ */
+ for (i = 0; i < sizeof(addr6); i++) {
+ if ((((u_char *)&addr6)[i] & ((u_char *)&mask6)[i]) !=
+ (((u_char *)&in6)[i] & ((u_char *)&mask6)[i]))
+ return (NULL);
+ }
+
+ /* After the mask check, use in6 instead of addr6. */
+ return (stf_getin4addr(sc, sin, in6, mask6));
+}
+
+static struct sockaddr_in *
+stf_getin4addr(struct stf_softc *sc, struct sockaddr_in *sin,
+ struct in6_addr addr6, struct in6_addr mask6)
+{
+ struct in_addr *in;
+
+ DEBUG_PRINTF(1, "%s: enter.\n", __func__);
+#if STF_DEBUG > 3
+ {
+ char tmpbuf[INET6_ADDRSTRLEN + 1];
+ memset(&tmpbuf, 0, INET6_ADDRSTRLEN);
+
+ ip6_sprintf(tmpbuf, &addr6);
+ DEBUG_PRINTF(1, "%s: addr6 = %s\n", __func__, tmpbuf);
+ }
+#endif
+ memset(sin, 0, sizeof(*sin));
+ in = &sin->sin_addr;
+ if (IN6_IS_ADDR_6TO4(&addr6)) {
+ /* 6to4 (RFC 3056) */
+ bcopy(GET_V4(&addr6), in, sizeof(*in));
+ if (isrfc1918addr(in))
+ return (NULL);
+ } else {
+ /* 6rd (RFC 5569) */
+ struct in6_addr buf;
+ u_char *p = (u_char *)&buf;
+ u_char *q = (u_char *)&in->s_addr;
+ u_int residue = 0, v4residue = 0;
+ u_char mask, v4mask = 0;
+ int i, j;
+ u_int plen, loop;
+
+ /*
+ * 6rd-relays IPv6 prefix is located at a 32-bit just
+ * after the prefix edge.
+ */
+ plen = in6_mask2len(&mask6, NULL);
+ if (64 < plen) {
+ DEBUG_PRINTF(1, "prefixlen is %d\n", plen);
+ return (NULL);
+ }
+
+ loop = 4; /* Normal 6rd operation */
+ memcpy(&buf, &addr6, sizeof(buf));
+ if (sc->v4prefixlen != 0 && sc->v4prefixlen != 32)
+ v4residue = sc->v4prefixlen % 8;
+ p += plen / 8;
+ //plen -= 32;
+
+ residue = plen % 8;
+ mask = ((u_char)(-1) >> (8 - residue));
+ if (v4residue) {
+ loop++;
+ v4mask = ((u_char)(-1) << v4residue);
+ }
+ /*
+ * The p points head of the IPv4 address part in
+ * bytes. The residue is a bit-shift factor when
+ * prefixlen is not a multiple of 8.
+ */
+ DEBUG_PRINTF(2, "residue = %d 0x%x\n", residue, mask);
+ for (j = (loop - (sc->v4prefixlen / 8)),
+ i = (loop - (sc->v4prefixlen / 8));
+ i < loop; j++, i++) {
+ if (residue) {
+ q[i] = ((p[j] & mask) << (8 - residue));
+ q[i] |= ((p[j + 1] >> residue) & mask);
+ DEBUG_PRINTF(2,
+ "FINAL i = %d q[%d] - p[%d/%d] %x\n",
+ i, q[i], p[j], p[j + 1] >> residue, q[i]);
+ } else {
+ q[i] = p[j];
+ DEBUG_PRINTF(2,
+ "FINAL i = %d q[%d] - p[%d] %x\n",
+ i, q[i], p[j], q[i]);
+ }
+ }
+ if (v4residue)
+ q[loop - (sc->v4prefixlen / 8)] &= v4mask;
+
+ if (sc->v4prefixlen > 0 && sc->v4prefixlen < 32)
+ in->s_addr |= sc->inaddr &
+ ((uint32_t)(-1) >> (32 - sc->v4prefixlen));
+ }
+
+#if STF_DEBUG > 3
+ {
+ char tmpbuf[INET6_ADDRSTRLEN + 1];
+ memset(&tmpbuf, 0, INET_ADDRSTRLEN);
+
+ ip_sprintf(tmpbuf, in);
+ DEBUG_PRINTF(1, "%s: in->in_addr = %s\n", __func__, tmpbuf);
+ }
+#endif
+
+ return (sin);
+}
+
static int
stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ifaddr *ifa;
+ struct ifdrv *ifd;
struct ifreq *ifr;
- struct sockaddr_in6 *sin6;
- struct in_addr addr;
+ struct sockaddr_in sin4;
+ struct stf_softc *sc, *sc_cur;
+ struct stfv4args args;
+ struct in6_addr addr6, mask6;
int error, mtu;
error = 0;
+ sc_cur = ifp->if_softc;
+
switch (cmd) {
+ case SIOCSDRVSPEC:
+ ifd = (struct ifdrv *)data;
+ error = priv_check(curthread, PRIV_NET_ADDIFADDR);
+ if (error)
+ break;
+ if (ifd->ifd_cmd == STF_SV4NET) {
+ if (ifd->ifd_len != sizeof(args)) {
+ error = EINVAL;
+ break;
+ }
+ mtx_lock(&stf_mtx);
+ LIST_FOREACH(sc, &V_stf_softc_list, stf_list) {
+ if (sc == sc_cur)
+ continue;
+ if (sc->inaddr == 0 || sc->v4prefixlen == 0)
+ continue;
+
+ if ((ntohl(sc->inaddr) &
+ ((uint32_t)(-1) << sc_cur->v4prefixlen)) ==
+ ntohl(sc_cur->inaddr)) {
+ error = EEXIST;
+ mtx_unlock(&stf_mtx);
+ return (error);
+ }
+ if ((ntohl(sc_cur->inaddr) &
+ ((uint32_t)(-1) << sc->v4prefixlen)) ==
+ ntohl(sc->inaddr)) {
+ error = EEXIST;
+ mtx_unlock(&stf_mtx);
+ return (error);
+ }
+ }
+ mtx_unlock(&stf_mtx);
+ bzero(&args, sizeof args);
+ error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
+ if (error)
+ break;
+
+ sc_cur->srcv4_addr = args.inaddr.s_addr;
+ sc_cur->inaddr = ntohl(args.inaddr.s_addr);
+ sc_cur->inaddr &= ((uint32_t)(-1) << args.prefix);
+ sc_cur->inaddr = htonl(sc_cur->inaddr);
+ sc_cur->v4prefixlen = args.prefix;
+ if (sc_cur->v4prefixlen == 0)
+ sc_cur->v4prefixlen = 32;
+ } else if (ifd->ifd_cmd == STF_SDSTV4) {
+ if (ifd->ifd_len != sizeof(args)) {
+ error = EINVAL;
+ break;
+ }
+ bzero(&args, sizeof args);
+ error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
+ if (error)
+ break;
+ sc_cur->dstv4_addr = args.dstv4_addr.s_addr;
+ } else
+ error = EINVAL;
+ break;
+ case SIOCGDRVSPEC:
+ ifd = (struct ifdrv *)data;
+ if (ifd->ifd_len != sizeof(args)) {
+ error = EINVAL;
+ break;
+ }
+ if (ifd->ifd_cmd != STF_GV4NET) {
+ error = EINVAL;
+ break;
+ }
+ bzero(&args, sizeof args);
+ args.inaddr.s_addr = sc_cur->srcv4_addr;
+ args.dstv4_addr.s_addr = sc_cur->dstv4_addr;
+ args.prefix = sc_cur->v4prefixlen;
+ error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
+ break;
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)) {
+ if (stf_getin4addr(sc_cur, &sin4,
+ satosin6(ifa->ifa_addr)->sin6_addr,
+ satosin6(ifa->ifa_netmask)->sin6_addr) == NULL) {
error = EINVAL;
break;
}
- bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr));
- if (isrfc1918addr(&addr)) {
- error = EINVAL;
- break;
+ /*
+ * Sanity check: if more than two interfaces have IFF_UP, do
+ * if_down() for all of them except for the specified one.
+ */
+ mtx_lock(&stf_mtx);
+ LIST_FOREACH(sc, &V_stf_softc_list, stf_list) {
+ if (sc == sc_cur)
+ continue;
+ if (stf_getsrcifa6(ifp, &addr6, &mask6) != 0)
+ continue;
+ if (IN6_ARE_ADDR_EQUAL(&addr6,
+ &ifatoia6(ifa)->ia_addr.sin6_addr)) {
+ error = EEXIST;
+ break;
+ }
}
+ mtx_unlock(&stf_mtx);
ifp->if_flags |= IFF_UP;
+ ifp->if_drv_flags |= IFF_DRV_RUNNING;
break;
case SIOCADDMULTI:
@@ -733,6 +1148,13 @@ stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
error = EAFNOSUPPORT;
break;
+ case SIOCSIFFLAGS:
+ if (ifp->if_flags & IFF_UP)
+ ifp->if_drv_flags |= IFF_DRV_RUNNING;
+ else
+ ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
+ break;
+
case SIOCGIFMTU:
break;
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