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freebsd-dev/sys/netinet6/in6_ifattach.c
Kevin Lo e06e816f67 Add support for UDP-Lite protocol (RFC 3828) to IPv4 and IPv6 stacks. 
Tested with vlc and a test suite [1].

[1] http://www.erg.abdn.ac.uk/~gerrit/udp-lite/files/udplite_linux.tar.gz

Reviewed by:	jhb, glebius, adrian
2014-04-07 01:53:03 +00:00

962 lines
25 KiB
C
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/*-
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/md5.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/mld6_var.h>
#include <netinet6/scope6_var.h>
VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
#ifdef IP6_AUTO_LINKLOCAL
VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
#else
VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
#endif
VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
VNET_DECLARE(struct inpcbinfo, ripcbinfo);
#define V_ripcbinfo VNET(ripcbinfo)
static int get_rand_ifid(struct ifnet *, struct in6_addr *);
static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
static int in6_ifattach_loopback(struct ifnet *);
static void in6_purgemaddrs(struct ifnet *);
#define EUI64_GBIT 0x01
#define EUI64_UBIT 0x02
#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
/*
* Generate a last-resort interface identifier, when the machine has no
* IEEE802/EUI64 address sources.
* The goal here is to get an interface identifier that is
* (1) random enough and (2) does not change across reboot.
* We currently use MD5(hostname) for it.
*
* in6 - upper 64bits are preserved
*/
static int
get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
{
MD5_CTX ctxt;
struct prison *pr;
u_int8_t digest[16];
int hostnamelen;
pr = curthread->td_ucred->cr_prison;
mtx_lock(&pr->pr_mtx);
hostnamelen = strlen(pr->pr_hostname);
#if 0
/* we need at least several letters as seed for ifid */
if (hostnamelen < 3) {
mtx_unlock(&pr->pr_mtx);
return -1;
}
#endif
/* generate 8 bytes of pseudo-random value. */
bzero(&ctxt, sizeof(ctxt));
MD5Init(&ctxt);
MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
mtx_unlock(&pr->pr_mtx);
MD5Final(digest, &ctxt);
/* assumes sizeof(digest) > sizeof(ifid) */
bcopy(digest, &in6->s6_addr[8], 8);
/* make sure to set "u" bit to local, and "g" bit to individual. */
in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
/* convert EUI64 into IPv6 interface identifier */
EUI64_TO_IFID(in6);
return 0;
}
static int
generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
{
MD5_CTX ctxt;
u_int8_t seed[16], digest[16], nullbuf[8];
u_int32_t val32;
/* If there's no history, start with a random seed. */
bzero(nullbuf, sizeof(nullbuf));
if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
int i;
for (i = 0; i < 2; i++) {
val32 = arc4random();
bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
}
} else
bcopy(seed0, seed, 8);
/* copy the right-most 64-bits of the given address */
/* XXX assumption on the size of IFID */
bcopy(seed1, &seed[8], 8);
if (0) { /* for debugging purposes only */
int i;
printf("generate_tmp_ifid: new randomized ID from: ");
for (i = 0; i < 16; i++)
printf("%02x", seed[i]);
printf(" ");
}
/* generate 16 bytes of pseudo-random value. */
bzero(&ctxt, sizeof(ctxt));
MD5Init(&ctxt);
MD5Update(&ctxt, seed, sizeof(seed));
MD5Final(digest, &ctxt);
/*
* RFC 3041 3.2.1. (3)
* Take the left-most 64-bits of the MD5 digest and set bit 6 (the
* left-most bit is numbered 0) to zero.
*/
bcopy(digest, ret, 8);
ret[0] &= ~EUI64_UBIT;
/*
* XXX: we'd like to ensure that the generated value is not zero
* for simplicity. If the caclculated digest happens to be zero,
* use a random non-zero value as the last resort.
*/
if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
nd6log((LOG_INFO,
"generate_tmp_ifid: computed MD5 value is zero.\n"));
val32 = arc4random();
val32 = 1 + (val32 % (0xffffffff - 1));
}
/*
* RFC 3041 3.2.1. (4)
* Take the rightmost 64-bits of the MD5 digest and save them in
* stable storage as the history value to be used in the next
* iteration of the algorithm.
*/
bcopy(&digest[8], seed0, 8);
if (0) { /* for debugging purposes only */
int i;
printf("to: ");
for (i = 0; i < 16; i++)
printf("%02x", digest[i]);
printf("\n");
}
return 0;
}
/*
* Get interface identifier for the specified interface.
* XXX assumes single sockaddr_dl (AF_LINK address) per an interface
*
* in6 - upper 64bits are preserved
*/
int
in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
{
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
u_int8_t *addr;
size_t addrlen;
static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
static u_int8_t allone[8] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if (sdl == NULL)
continue;
if (sdl->sdl_alen == 0)
continue;
goto found;
}
IF_ADDR_RUNLOCK(ifp);
return -1;
found:
IF_ADDR_LOCK_ASSERT(ifp);
addr = LLADDR(sdl);
addrlen = sdl->sdl_alen;
/* get EUI64 */
switch (ifp->if_type) {
case IFT_BRIDGE:
case IFT_ETHER:
case IFT_L2VLAN:
case IFT_FDDI:
case IFT_ISO88025:
case IFT_ATM:
case IFT_IEEE1394:
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
/* IEEE802/EUI64 cases - what others? */
/* IEEE1394 uses 16byte length address starting with EUI64 */
if (addrlen > 8)
addrlen = 8;
/* look at IEEE802/EUI64 only */
if (addrlen != 8 && addrlen != 6) {
IF_ADDR_RUNLOCK(ifp);
return -1;
}
/*
* check for invalid MAC address - on bsdi, we see it a lot
* since wildboar configures all-zero MAC on pccard before
* card insertion.
*/
if (bcmp(addr, allzero, addrlen) == 0) {
IF_ADDR_RUNLOCK(ifp);
return -1;
}
if (bcmp(addr, allone, addrlen) == 0) {
IF_ADDR_RUNLOCK(ifp);
return -1;
}
/* make EUI64 address */
if (addrlen == 8)
bcopy(addr, &in6->s6_addr[8], 8);
else if (addrlen == 6) {
in6->s6_addr[8] = addr[0];
in6->s6_addr[9] = addr[1];
in6->s6_addr[10] = addr[2];
in6->s6_addr[11] = 0xff;
in6->s6_addr[12] = 0xfe;
in6->s6_addr[13] = addr[3];
in6->s6_addr[14] = addr[4];
in6->s6_addr[15] = addr[5];
}
break;
case IFT_ARCNET:
if (addrlen != 1) {
IF_ADDR_RUNLOCK(ifp);
return -1;
}
if (!addr[0]) {
IF_ADDR_RUNLOCK(ifp);
return -1;
}
bzero(&in6->s6_addr[8], 8);
in6->s6_addr[15] = addr[0];
/*
* due to insufficient bitwidth, we mark it local.
*/
in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
break;
case IFT_GIF:
#ifdef IFT_STF
case IFT_STF:
#endif
/*
* RFC2893 says: "SHOULD use IPv4 address as ifid source".
* however, IPv4 address is not very suitable as unique
* identifier source (can be renumbered).
* we don't do this.
*/
IF_ADDR_RUNLOCK(ifp);
return -1;
default:
IF_ADDR_RUNLOCK(ifp);
return -1;
}
/* sanity check: g bit must not indicate "group" */
if (EUI64_GROUP(in6)) {
IF_ADDR_RUNLOCK(ifp);
return -1;
}
/* convert EUI64 into IPv6 interface identifier */
EUI64_TO_IFID(in6);
/*
* sanity check: ifid must not be all zero, avoid conflict with
* subnet router anycast
*/
if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
IF_ADDR_RUNLOCK(ifp);
return -1;
}
IF_ADDR_RUNLOCK(ifp);
return 0;
}
/*
* Get interface identifier for the specified interface. If it is not
* available on ifp0, borrow interface identifier from other information
* sources.
*
* altifp - secondary EUI64 source
*/
static int
get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
struct in6_addr *in6)
{
struct ifnet *ifp;
/* first, try to get it from the interface itself */
if (in6_get_hw_ifid(ifp0, in6) == 0) {
nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
if_name(ifp0)));
goto success;
}
/* try secondary EUI64 source. this basically is for ATM PVC */
if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
if_name(ifp0), if_name(altifp)));
goto success;
}
/* next, try to get it from some other hardware interface */
IFNET_RLOCK_NOSLEEP();
TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
if (ifp == ifp0)
continue;
if (in6_get_hw_ifid(ifp, in6) != 0)
continue;
/*
* to borrow ifid from other interface, ifid needs to be
* globally unique
*/
if (IFID_UNIVERSAL(in6)) {
nd6log((LOG_DEBUG,
"%s: borrow interface identifier from %s\n",
if_name(ifp0), if_name(ifp)));
IFNET_RUNLOCK_NOSLEEP();
goto success;
}
}
IFNET_RUNLOCK_NOSLEEP();
/* last resort: get from random number source */
if (get_rand_ifid(ifp, in6) == 0) {
nd6log((LOG_DEBUG,
"%s: interface identifier generated by random number\n",
if_name(ifp0)));
goto success;
}
printf("%s: failed to get interface identifier\n", if_name(ifp0));
return -1;
success:
nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
in6->s6_addr[14], in6->s6_addr[15]));
return 0;
}
/*
* altifp - secondary EUI64 source
*/
static int
in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
{
struct in6_ifaddr *ia;
struct in6_aliasreq ifra;
struct nd_prefixctl pr0;
int error;
/*
* configure link-local address.
*/
in6_prepare_ifra(&ifra, NULL, &in6mask64);
ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
} else {
if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
nd6log((LOG_ERR,
"%s: no ifid available\n", if_name(ifp)));
return (-1);
}
}
if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
return (-1);
/* link-local addresses should NEVER expire. */
ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
/*
* Now call in6_update_ifa() to do a bunch of procedures to configure
* a link-local address. We can set the 3rd argument to NULL, because
* we know there's no other link-local address on the interface
* and therefore we are adding one (instead of updating one).
*/
if ((error = in6_update_ifa(ifp, &ifra, NULL,
IN6_IFAUPDATE_DADDELAY)) != 0) {
/*
* XXX: When the interface does not support IPv6, this call
* would fail in the SIOCSIFADDR ioctl. I believe the
* notification is rather confusing in this case, so just
* suppress it. (jinmei@kame.net 20010130)
*/
if (error != EAFNOSUPPORT)
nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
"configure a link-local address on %s "
"(errno=%d)\n",
if_name(ifp), error));
return (-1);
}
ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp));
ifa_free(&ia->ia_ifa);
/*
* Make the link-local prefix (fe80::%link/64) as on-link.
* Since we'd like to manage prefixes separately from addresses,
* we make an ND6 prefix structure for the link-local prefix,
* and add it to the prefix list as a never-expire prefix.
* XXX: this change might affect some existing code base...
*/
bzero(&pr0, sizeof(pr0));
pr0.ndpr_ifp = ifp;
/* this should be 64 at this moment. */
pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
pr0.ndpr_prefix = ifra.ifra_addr;
/* apply the mask for safety. (nd6_prelist_add will apply it again) */
IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64);
/*
* Initialize parameters. The link-local prefix must always be
* on-link, and its lifetimes never expire.
*/
pr0.ndpr_raf_onlink = 1;
pr0.ndpr_raf_auto = 1; /* probably meaningless */
pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
/*
* Since there is no other link-local addresses, nd6_prefix_lookup()
* probably returns NULL. However, we cannot always expect the result.
* For example, if we first remove the (only) existing link-local
* address, and then reconfigure another one, the prefix is still
* valid with referring to the old link-local address.
*/
if (nd6_prefix_lookup(&pr0) == NULL) {
if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
return (error);
}
return 0;
}
/*
* ifp - must be IFT_LOOP
*/
static int
in6_ifattach_loopback(struct ifnet *ifp)
{
struct in6_aliasreq ifra;
int error;
in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128);
/*
* Always initialize ia_dstaddr (= broadcast address) to loopback
* address. Follows IPv4 practice - see in_ifinit().
*/
ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
ifra.ifra_dstaddr.sin6_family = AF_INET6;
ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
/* the loopback address should NEVER expire. */
ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
/* we don't need to perform DAD on loopback interfaces. */
ifra.ifra_flags |= IN6_IFF_NODAD;
/* skip registration to the prefix list. XXX should be temporary. */
ifra.ifra_flags |= IN6_IFF_NOPFX;
/*
* We are sure that this is a newly assigned address, so we can set
* NULL to the 3rd arg.
*/
if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
"the loopback address on %s (errno=%d)\n",
if_name(ifp), error));
return (-1);
}
return 0;
}
/*
* compute NI group address, based on the current hostname setting.
* see RFC 4620.
*
* when ifp == NULL, the caller is responsible for filling scopeid.
*
* If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address
* while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620.
*/
static int
in6_nigroup0(struct ifnet *ifp, const char *name, int namelen,
struct in6_addr *in6, int oldmcprefix)
{
struct prison *pr;
const char *p;
u_char *q;
MD5_CTX ctxt;
u_int8_t digest[16];
char l;
char n[64]; /* a single label must not exceed 63 chars */
/*
* If no name is given and namelen is -1,
* we try to do the hostname lookup ourselves.
*/
if (!name && namelen == -1) {
pr = curthread->td_ucred->cr_prison;
mtx_lock(&pr->pr_mtx);
name = pr->pr_hostname;
namelen = strlen(name);
} else
pr = NULL;
if (!name || !namelen) {
if (pr != NULL)
mtx_unlock(&pr->pr_mtx);
return -1;
}
p = name;
while (p && *p && *p != '.' && p - name < namelen)
p++;
if (p == name || p - name > sizeof(n) - 1) {
if (pr != NULL)
mtx_unlock(&pr->pr_mtx);
return -1; /* label too long */
}
l = p - name;
strncpy(n, name, l);
if (pr != NULL)
mtx_unlock(&pr->pr_mtx);
n[(int)l] = '\0';
for (q = n; *q; q++) {
if ('A' <= *q && *q <= 'Z')
*q = *q - 'A' + 'a';
}
/* generate 16 bytes of pseudo-random value. */
bzero(&ctxt, sizeof(ctxt));
MD5Init(&ctxt);
MD5Update(&ctxt, &l, sizeof(l));
MD5Update(&ctxt, n, l);
MD5Final(digest, &ctxt);
bzero(in6, sizeof(*in6));
in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
in6->s6_addr8[11] = 2;
if (oldmcprefix == 0) {
in6->s6_addr8[12] = 0xff;
/* Copy the first 24 bits of 128-bit hash into the address. */
bcopy(digest, &in6->s6_addr8[13], 3);
} else {
/* Copy the first 32 bits of 128-bit hash into the address. */
bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
}
if (in6_setscope(in6, ifp, NULL))
return (-1); /* XXX: should not fail */
return 0;
}
int
in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
struct in6_addr *in6)
{
return (in6_nigroup0(ifp, name, namelen, in6, 0));
}
int
in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen,
struct in6_addr *in6)
{
return (in6_nigroup0(ifp, name, namelen, in6, 1));
}
/*
* XXX multiple loopback interface needs more care. for instance,
* nodelocal address needs to be configured onto only one of them.
* XXX multiple link-local address case
*
* altifp - secondary EUI64 source
*/
void
in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
{
struct in6_ifaddr *ia;
struct in6_addr in6;
if (ifp->if_afdata[AF_INET6] == NULL)
return;
/*
* quirks based on interface type
*/
switch (ifp->if_type) {
case IFT_STF:
/*
* 6to4 interface is a very special kind of beast.
* no multicast, no linklocal. RFC2529 specifies how to make
* linklocals for 6to4 interface, but there's no use and
* it is rather harmful to have one.
*/
ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
break;
default:
break;
}
/*
* usually, we require multicast capability to the interface
*/
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
nd6log((LOG_INFO, "in6_ifattach: "
"%s is not multicast capable, IPv6 not enabled\n",
if_name(ifp)));
return;
}
/*
* assign loopback address for loopback interface.
* XXX multiple loopback interface case.
*/
if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
struct ifaddr *ifa;
in6 = in6addr_loopback;
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
if (ifa == NULL) {
if (in6_ifattach_loopback(ifp) != 0)
return;
} else
ifa_free(ifa);
}
/*
* assign a link-local address, if there's none.
*/
if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
int error;
ia = in6ifa_ifpforlinklocal(ifp, 0);
if (ia == NULL) {
error = in6_ifattach_linklocal(ifp, altifp);
#if 0
if (error)
log(LOG_NOTICE, "in6_ifattach_linklocal: "
"failed to add a link-local addr to %s\n",
if_name(ifp));
#endif
} else
ifa_free(&ia->ia_ifa);
}
/* update dynamically. */
if (V_in6_maxmtu < ifp->if_mtu)
V_in6_maxmtu = ifp->if_mtu;
}
/*
* NOTE: in6_ifdetach() does not support loopback if at this moment.
* We don't need this function in bsdi, because interfaces are never removed
* from the ifnet list in bsdi.
*/
void
in6_ifdetach(struct ifnet *ifp)
{
struct in6_ifaddr *ia;
struct ifaddr *ifa, *next;
struct radix_node_head *rnh;
struct rtentry *rt;
struct sockaddr_in6 sin6;
struct in6_multi_mship *imm;
if (ifp->if_afdata[AF_INET6] == NULL)
return;
/* remove neighbor management table */
nd6_purge(ifp);
/* nuke any of IPv6 addresses we have */
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
in6_purgeaddr(ifa);
}
/* undo everything done by in6_ifattach(), just in case */
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
if (ifa->ifa_addr->sa_family != AF_INET6
|| !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
continue;
}
ia = (struct in6_ifaddr *)ifa;
/*
* leave from multicast groups we have joined for the interface
*/
while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
LIST_REMOVE(imm, i6mm_chain);
in6_leavegroup(imm);
}
/* Remove link-local from the routing table. */
if (ia->ia_flags & IFA_ROUTE)
(void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags);
/* remove from the linked list */
IF_ADDR_WLOCK(ifp);
TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
IF_ADDR_WUNLOCK(ifp);
ifa_free(ifa); /* if_addrhead */
IN6_IFADDR_WLOCK();
TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
IN6_IFADDR_WUNLOCK();
ifa_free(ifa);
}
in6_pcbpurgeif0(&V_udbinfo, ifp);
in6_pcbpurgeif0(&V_ulitecbinfo, ifp);
in6_pcbpurgeif0(&V_ripcbinfo, ifp);
/* leave from all multicast groups joined */
in6_purgemaddrs(ifp);
/*
* remove neighbor management table. we call it twice just to make
* sure we nuke everything. maybe we need just one call.
* XXX: since the first call did not release addresses, some prefixes
* might remain. We should call nd6_purge() again to release the
* prefixes after removing all addresses above.
* (Or can we just delay calling nd6_purge until at this point?)
*/
nd6_purge(ifp);
/*
* Remove route to link-local allnodes multicast (ff02::1).
* These only get automatically installed for the default FIB.
*/
bzero(&sin6, sizeof(sin6));
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = in6addr_linklocal_allnodes;
if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
/* XXX: should not fail */
return;
/* XXX grab lock first to avoid LOR */
rnh = rt_tables_get_rnh(RT_DEFAULT_FIB, AF_INET6);
if (rnh != NULL) {
RADIX_NODE_HEAD_LOCK(rnh);
rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED,
RT_DEFAULT_FIB);
if (rt) {
if (rt->rt_ifp == ifp)
rtexpunge(rt);
RTFREE_LOCKED(rt);
}
RADIX_NODE_HEAD_UNLOCK(rnh);
}
}
int
in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
const u_int8_t *baseid, int generate)
{
u_int8_t nullbuf[8];
struct nd_ifinfo *ndi = ND_IFINFO(ifp);
bzero(nullbuf, sizeof(nullbuf));
if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
/* we've never created a random ID. Create a new one. */
generate = 1;
}
if (generate) {
bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
/* generate_tmp_ifid will update seedn and buf */
(void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
ndi->randomid);
}
bcopy(ndi->randomid, retbuf, 8);
return (0);
}
void
in6_tmpaddrtimer(void *arg)
{
CURVNET_SET((struct vnet *) arg);
struct nd_ifinfo *ndi;
u_int8_t nullbuf[8];
struct ifnet *ifp;
callout_reset(&V_in6_tmpaddrtimer_ch,
(V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
bzero(nullbuf, sizeof(nullbuf));
TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
if (ifp->if_afdata[AF_INET6] == NULL)
continue;
ndi = ND_IFINFO(ifp);
if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
/*
* We've been generating a random ID on this interface.
* Create a new one.
*/
(void)generate_tmp_ifid(ndi->randomseed0,
ndi->randomseed1, ndi->randomid);
}
}
CURVNET_RESTORE();
}
static void
in6_purgemaddrs(struct ifnet *ifp)
{
LIST_HEAD(,in6_multi) purgeinms;
struct in6_multi *inm, *tinm;
struct ifmultiaddr *ifma;
LIST_INIT(&purgeinms);
IN6_MULTI_LOCK();
/*
* Extract list of in6_multi associated with the detaching ifp
* which the PF_INET6 layer is about to release.
* We need to do this as IF_ADDR_LOCK() may be re-acquired
* by code further down.
*/
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET6 ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in6_multi *)ifma->ifma_protospec;
LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
}
IF_ADDR_RUNLOCK(ifp);
LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
LIST_REMOVE(inm, in6m_entry);
in6m_release_locked(inm);
}
mld_ifdetach(ifp);
IN6_MULTI_UNLOCK();
}
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