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Fix hostname to be returned in an ICMPv6 NI Reply message defined

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in RFC 4620, ICMPv6 Node Information Queries.  A vnet jail with an
IPv6 address sent a hostname of the host environment, not the
jail, even if another hostname was set to the jail.

This change can be tested by the following commands:

 # ifconfig epair0 create
 # jail -c -n j1 vnet host.hostname=vnetjail path=/ persist
 # ifconfig epair0b vnet j1
 # ifconfig epair0a inet6 -ifdisabled auto_linklocal up
 # jexec j1 ifconfig epair0b inet6 -ifdisabled auto_linklocal up
 # ping6 -w ff02::1%epair0a

Differential Revision:	https://reviews.freebsd.org/D20207
MFC after:	1 week
This commit is contained in:
Hiroki Sato 2019-05-16 19:09:41 +00:00
parent 48149a5a50
commit 7460ef5d7a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=347887
1 changed files with 19 additions and 14 deletions
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33
sys/netinet6/icmp6.c
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@ -140,7 +140,7 @@ static int icmp6_rip6_input(struct mbuf **, int);
static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
static const char *icmp6_redirect_diag(struct in6_addr *,
struct in6_addr *, struct in6_addr *);
static struct mbuf *ni6_input(struct mbuf *, int);
static struct mbuf *ni6_input(struct mbuf *, int, struct prison *);
static struct mbuf *ni6_nametodns(const char *, int, int);
static int ni6_dnsmatch(const char *, int, const char *, int);
static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
@ -627,6 +627,7 @@ icmp6_input(struct mbuf **mp, int *offp, int proto)
case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
{
enum { WRU, FQDN } mode;
struct prison *pr;
if (!V_icmp6_nodeinfo)
break;
@ -638,6 +639,14 @@ icmp6_input(struct mbuf **mp, int *offp, int proto)
else
goto badlen;
pr = NULL;
sx_slock(&allprison_lock);
TAILQ_FOREACH(pr, &allprison, pr_list)
if (pr->pr_vnet == ifp->if_vnet)
break;
sx_sunlock(&allprison_lock);
if (pr == NULL)
pr = curthread->td_ucred->cr_prison;
if (mode == FQDN) {
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
@ -645,11 +654,10 @@ icmp6_input(struct mbuf **mp, int *offp, int proto)
#endif
n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
if (n)
n = ni6_input(n, off);
n = ni6_input(n, off, pr);
/* XXX meaningless if n == NULL */
noff = sizeof(struct ip6_hdr);
} else {
struct prison *pr;
u_char *p;
int maxhlen, hlen;
@ -683,13 +691,6 @@ icmp6_input(struct mbuf **mp, int *offp, int proto)
n = NULL;
break;
}
maxhlen = M_TRAILINGSPACE(n) -
(sizeof(*nip6) + sizeof(*nicmp6) + 4);
pr = curthread->td_ucred->cr_prison;
mtx_lock(&pr->pr_mtx);
hlen = strlen(pr->pr_hostname);
if (maxhlen > hlen)
maxhlen = hlen;
/*
* Copy IPv6 and ICMPv6 only.
*/
@ -699,6 +700,13 @@ icmp6_input(struct mbuf **mp, int *offp, int proto)
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
p = (u_char *)(nicmp6 + 1);
bzero(p, 4);
maxhlen = M_TRAILINGSPACE(n) -
(sizeof(*nip6) + sizeof(*nicmp6) + 4);
mtx_lock(&pr->pr_mtx);
hlen = strlen(pr->pr_hostname);
if (maxhlen > hlen)
maxhlen = hlen;
/* meaningless TTL */
bcopy(pr->pr_hostname, p + 4, maxhlen);
mtx_unlock(&pr->pr_mtx);
@ -1167,11 +1175,10 @@ icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
* with hostname changes by sethostname(3)
*/
static struct mbuf *
ni6_input(struct mbuf *m, int off)
ni6_input(struct mbuf *m, int off, struct prison *pr)
{
struct icmp6_nodeinfo *ni6, *nni6;
struct mbuf *n = NULL;
struct prison *pr;
u_int16_t qtype;
int subjlen;
int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
@ -1323,7 +1330,6 @@ ni6_input(struct mbuf *m, int off)
* wildcard match, if gethostname(3) side has
* truncated hostname.
*/
pr = curthread->td_ucred->cr_prison;
mtx_lock(&pr->pr_mtx);
n = ni6_nametodns(pr->pr_hostname,
strlen(pr->pr_hostname), 0);
@ -1448,7 +1454,6 @@ ni6_input(struct mbuf *m, int off)
/*
* XXX do we really have FQDN in hostname?
*/
pr = curthread->td_ucred->cr_prison;
mtx_lock(&pr->pr_mtx);
n->m_next = ni6_nametodns(pr->pr_hostname,
strlen(pr->pr_hostname), oldfqdn);