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NLM: Fix GRANT callback address comparison when IPv6 is enabled

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The NFS mount command may pass an AF_INET server address to lockd.  If
lockd happens to be using a PF_INET6 listener, the nlm_cmp_addr() in
nlmclnt_grant() will fail to match requests from that host because they
will all have a mapped IPv4 AF_INET6 address.

Adopt the same solution used in nfs_sockaddr_match_ipaddr() for NFSv4
callbacks: if either address is AF_INET, map it to an AF_INET6 address
before doing the comparison.

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 2009-03-10 20:33:20 -04:00 committed by Trond Myklebust
parent 78851e1aa4
commit 57df675c60
1 changed files with 50 additions and 1 deletions
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51
fs/lockd/clntlock.c
View file

@ -139,6 +139,55 @@ 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
*/
@ -166,7 +215,7 @@ __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 (!nlm_cmp_addr(nlm_addr(block->b_host), addr))
if (!nlmclnt_cmp_addr(block->b_host, addr))
continue;
if (nfs_compare_fh(NFS_FH(fl_blocked->fl_file->f_path.dentry->d_inode) ,fh) != 0)
continue;