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-rw-r--r--fs/nfs/client.c73
1 files changed, 72 insertions, 1 deletions
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 9b728f3565a1..574158ae2398 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -255,6 +255,32 @@ static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
}
return 0;
}
+
+/*
+ * Test if two ip6 socket addresses refer to the same socket by
+ * comparing relevant fields. The padding bytes specifically, are not
+ * compared. sin6_flowinfo is not compared because it only affects QoS
+ * and sin6_scope_id is only compared if the address is "link local"
+ * because "link local" addresses need only be unique to a specific
+ * link. Conversely, ordinary unicast addresses might have different
+ * sin6_scope_id.
+ *
+ * The caller should ensure both socket addresses are AF_INET6.
+ */
+static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
+ const struct sockaddr *sa2)
+{
+ const struct sockaddr_in6 *saddr1 = (const struct sockaddr_in6 *)sa1;
+ const struct sockaddr_in6 *saddr2 = (const struct sockaddr_in6 *)sa2;
+
+ if (!ipv6_addr_equal(&saddr1->sin6_addr,
+ &saddr1->sin6_addr))
+ return 0;
+ if (ipv6_addr_scope(&saddr1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
+ saddr1->sin6_scope_id != saddr2->sin6_scope_id)
+ return 0;
+ return saddr1->sin6_port == saddr2->sin6_port;
+}
#else
static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
const struct sockaddr_in *sa2)
@@ -270,9 +296,52 @@ static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
(const struct sockaddr_in *)sa2);
}
+
+static int nfs_sockaddr_cmp_ip6(const struct sockaddr * sa1,
+ const struct sockaddr * sa2)
+{
+ return 0;
+}
#endif
/*
+ * Test if two ip4 socket addresses refer to the same socket, by
+ * comparing relevant fields. The padding bytes specifically, are
+ * not compared.
+ *
+ * The caller should ensure both socket addresses are AF_INET.
+ */
+static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
+ const struct sockaddr *sa2)
+{
+ const struct sockaddr_in *saddr1 = (const struct sockaddr_in *)sa1;
+ const struct sockaddr_in *saddr2 = (const struct sockaddr_in *)sa2;
+
+ if (saddr1->sin_addr.s_addr != saddr2->sin_addr.s_addr)
+ return 0;
+ return saddr1->sin_port == saddr2->sin_port;
+}
+
+/*
+ * Test if two socket addresses represent the same actual socket,
+ * by comparing (only) relevant fields.
+ */
+static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
+ const struct sockaddr *sa2)
+{
+ if (sa1->sa_family != sa2->sa_family)
+ return 0;
+
+ switch (sa1->sa_family) {
+ case AF_INET:
+ return nfs_sockaddr_cmp_ip4(sa1, sa2);
+ case AF_INET6:
+ return nfs_sockaddr_cmp_ip6(sa1, sa2);
+ }
+ return 0;
+}
+
+/*
* Find a client by IP address and protocol version
* - returns NULL if no such client
*/
@@ -344,8 +413,10 @@ struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
{
struct nfs_client *clp;
+ const struct sockaddr *sap = data->addr;
list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
+ const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
/* Don't match clients that failed to initialise properly */
if (clp->cl_cons_state < 0)
continue;
@@ -358,7 +429,7 @@ static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *dat
continue;
/* Match the full socket address */
- if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
+ if (!nfs_sockaddr_cmp(sap, clap))
continue;
atomic_inc(&clp->cl_count);