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lockd: Start PF_INET6 listener only if IPv6 support is available

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Apparently a lot of people need to disable IPv6 completely on their
distributor-built systems, which have CONFIG_IPV6_MODULE enabled at
build time.

They do this by blacklisting the ipv6.ko module.  This causes the
creation of the lockd service listener to fail if CONFIG_IPV6_MODULE
is set, but the module cannot be loaded.

Now that the kernel's PF_INET6 RPC listeners are completely separate
from PF_INET listeners, we can always start PF_INET.  Then lockd can
try to start PF_INET6, but it isn't required to be available.

Note this has the added benefit that NLM callbacks from AF_INET6
servers will never come from AF_INET remotes.  We no longer have to
worry about matching mapped IPv4 addresses to AF_INET when comparing
addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2009-03-18 20:47:59 -04:00 committed by Trond Myklebust
parent 9355982830
commit eb16e90778
2 changed files with 22 additions and 59 deletions
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51
fs/lockd/clntlock.c
View file

@ -139,55 +139,6 @@ int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout)
return 0;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static const struct in6_addr *nlmclnt_map_v4addr(const struct sockaddr *sap,
struct in6_addr *addr_mapped)
{
const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
switch (sap->sa_family) {
case AF_INET6:
return &((const struct sockaddr_in6 *)sap)->sin6_addr;
case AF_INET:
ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, addr_mapped);
return addr_mapped;
}
return NULL;
}
/*
* If lockd is using a PF_INET6 listener, all incoming requests appear
* to come from AF_INET6 remotes. The address of AF_INET remotes are
* mapped to AF_INET6 automatically by the network layer. In case the
* user passed an AF_INET server address at mount time, ensure both
* addresses are AF_INET6 before comparing them.
*/
static int nlmclnt_cmp_addr(const struct nlm_host *host,
const struct sockaddr *sap)
{
const struct in6_addr *addr1;
const struct in6_addr *addr2;
struct in6_addr addr1_mapped;
struct in6_addr addr2_mapped;
addr1 = nlmclnt_map_v4addr(nlm_addr(host), &addr1_mapped);
if (likely(addr1 != NULL)) {
addr2 = nlmclnt_map_v4addr(sap, &addr2_mapped);
if (likely(addr2 != NULL))
return ipv6_addr_equal(addr1, addr2);
}
return 0;
}
#else /* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
static int nlmclnt_cmp_addr(const struct nlm_host *host,
const struct sockaddr *sap)
{
return nlm_cmp_addr(nlm_addr(host), sap);
}
#endif /* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
/*
* The server lockd has called us back to tell us the lock was granted
*/
@ -215,7 +166,7 @@ __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
*/
if (fl_blocked->fl_u.nfs_fl.owner->pid != lock->svid)
continue;
if (!nlmclnt_cmp_addr(block->b_host, addr))
if (!nlm_cmp_addr(nlm_addr(block->b_host), addr))
continue;
if (nfs_compare_fh(NFS_FH(fl_blocked->fl_file->f_path.dentry->d_inode) ,fh) != 0)
continue;

30
fs/lockd/svc.c
View file

@ -193,20 +193,30 @@ lockd(void *vrqstp)
return 0;
}
static int create_lockd_listener(struct svc_serv *serv, char *name,
unsigned short port)
static int create_lockd_listener(struct svc_serv *serv, const char *name,
const int family, const unsigned short port)
{
struct svc_xprt *xprt;
xprt = svc_find_xprt(serv, name, 0, 0);
xprt = svc_find_xprt(serv, name, family, 0);
if (xprt == NULL)
return svc_create_xprt(serv, name, PF_INET,
port, SVC_SOCK_DEFAULTS);
return svc_create_xprt(serv, name, family, port,
SVC_SOCK_DEFAULTS);
svc_xprt_put(xprt);
return 0;
}
static int create_lockd_family(struct svc_serv *serv, const int family)
{
int err;
err = create_lockd_listener(serv, "udp", family, nlm_udpport);
if (err < 0)
return err;
return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
}
/*
* Ensure there are active UDP and TCP listeners for lockd.
*
@ -222,13 +232,15 @@ static int make_socks(struct svc_serv *serv)
static int warned;
int err;
err = create_lockd_listener(serv, "udp", nlm_udpport);
err = create_lockd_family(serv, PF_INET);
if (err < 0)
goto out_err;
err = create_lockd_listener(serv, "tcp", nlm_tcpport);
if (err < 0)
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
err = create_lockd_family(serv, PF_INET6);
if (err < 0 && err != -EAFNOSUPPORT)
goto out_err;
#endif /* CONFIG_IPV6 || CONFIG_IPV6_MODULE */
warned = 0;
return 0;