1 files changed, 38 insertions, 9 deletions

diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index cbd2398e594c..9fd8889097b7 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -304,16 +304,33 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
         return nlm_lookup_host(&ni);
 }
 
-/*
- * Find an NLM client handle in the cache. If there is none, create it.
+/**
+ * nlmsvc_lookup_host - Find an NLM host handle matching a remote client
+ * @rqstp: incoming NLM request
+ * @hostname: name of client host
+ * @hostname_len: length of client hostname
+ *
+ * Returns an nlm_host structure that matches the [client address,
+ * transport protocol, NLM version, client hostname] of the passed-in
+ * NLM request.  If one doesn't already exist in the host cache, a
+ * new handle is created and returned.
+ *
+ * Before possibly creating a new nlm_host, construct a sockaddr
+ * for a specific source address in case the local system has
+ * multiple network addresses.  The family of the address in
+ * rq_daddr is guaranteed to be the same as the family of the
+ * address in rq_addr, so it's safe to use the same family for
+ * the source address.
  */
-struct nlm_host *
-nlmsvc_lookup_host(struct svc_rqst *rqstp,
-                        const char *hostname, unsigned int hostname_len)
+struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
+                                    const char *hostname,
+                                    const size_t hostname_len)
 {
-        const struct sockaddr_in source = {
+        struct sockaddr_in sin = {
                 .sin_family     = AF_INET,
-                .sin_addr       = rqstp->rq_daddr.addr,
+        };
+        struct sockaddr_in6 sin6 = {
+                .sin6_family    = AF_INET6,
         };
         struct nlm_lookup_host_info ni = {
                 .server         = 1,
@@ -323,14 +340,26 @@ nlmsvc_lookup_host(struct svc_rqst *rqstp,
                 .version        = rqstp->rq_vers,
                 .hostname       = hostname,
                 .hostname_len   = hostname_len,
-                .src_sap        = (struct sockaddr *)&source,
-                .src_len        = sizeof(source),
+                .src_len        = rqstp->rq_addrlen,
         };
 
         dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__,
                         (int)hostname_len, hostname, rqstp->rq_vers,
                         (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));
 
+        switch (ni.sap->sa_family) {
+        case AF_INET:
+                sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr;
+                ni.src_sap = (struct sockaddr *)&sin;
+                break;
+        case AF_INET6:
+                ipv6_addr_copy(&sin6.sin6_addr, &rqstp->rq_daddr.addr6);
+                ni.src_sap = (struct sockaddr *)&sin6;
+                break;
+        default:
+                return NULL;
+        }
+
         return nlm_lookup_host(&ni);
 }