NFS: Simplify logic to compare socket addresses in client.c
Callback requests from IPv4 servers are now always guaranteed to be
AF_INET, and never mapped IPv4 AF_INET6 addresses. Both
nfs_match_client() and nfs_find_client() can now share the same
address comparison logic, so fold them together.
We can also dispense with of most of the conditional compilation
in here.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 574158a..855daac 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -224,38 +224,6 @@
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-static const struct in6_addr *nfs_map_ipv4_addr(const struct sockaddr *sa, struct in6_addr *addr_mapped)
-{
- switch (sa->sa_family) {
- default:
- return NULL;
- case AF_INET6:
- return &((const struct sockaddr_in6 *)sa)->sin6_addr;
- break;
- case AF_INET:
- ipv6_addr_set_v4mapped(((const struct sockaddr_in *)sa)->sin_addr.s_addr,
- addr_mapped);
- return addr_mapped;
- }
-}
-
-static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
- const struct sockaddr *sa2)
-{
- const struct in6_addr *addr1;
- const struct in6_addr *addr2;
- struct in6_addr addr1_mapped;
- struct in6_addr addr2_mapped;
-
- addr1 = nfs_map_ipv4_addr(sa1, &addr1_mapped);
- if (likely(addr1 != NULL)) {
- addr2 = nfs_map_ipv4_addr(sa2, &addr2_mapped);
- if (likely(addr2 != NULL))
- return ipv6_addr_equal(addr1, addr2);
- }
- return 0;
-}
-
/*
* Test if two ip6 socket addresses refer to the same socket by
* comparing relevant fields. The padding bytes specifically, are not
@@ -267,38 +235,21 @@
*
* The caller should ensure both socket addresses are AF_INET6.
*/
-static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
- const struct sockaddr *sa2)
+static int nfs_sockaddr_match_ipaddr6(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;
+ const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
+ const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
- if (!ipv6_addr_equal(&saddr1->sin6_addr,
- &saddr1->sin6_addr))
+ if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
+ sin1->sin6_scope_id != sin2->sin6_scope_id)
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)
-{
- return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
-}
-static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
- const struct sockaddr *sa2)
-{
- if (unlikely(sa1->sa_family != AF_INET || sa2->sa_family != AF_INET))
- return 0;
- return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
- (const struct sockaddr_in *)sa2);
+ return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
}
-
-static int nfs_sockaddr_cmp_ip6(const struct sockaddr * sa1,
- const struct sockaddr * sa2)
+#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
+static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
+ const struct sockaddr *sa2)
{
return 0;
}
@@ -311,20 +262,57 @@
*
* The caller should ensure both socket addresses are AF_INET.
*/
+static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
+ const struct sockaddr *sa2)
+{
+ const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
+ const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
+
+ return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
+}
+
+static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
+ const struct sockaddr *sa2)
+{
+ const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
+ const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
+
+ return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
+ (sin1->sin6_port == sin2->sin6_port);
+}
+
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;
+ const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
+ const struct sockaddr_in *sin2 = (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;
+ return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
+ (sin1->sin_port == sin2->sin_port);
}
/*
* Test if two socket addresses represent the same actual socket,
- * by comparing (only) relevant fields.
+ * by comparing (only) relevant fields, excluding the port number.
+ */
+static int nfs_sockaddr_match_ipaddr(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_match_ipaddr4(sa1, sa2);
+ case AF_INET6:
+ return nfs_sockaddr_match_ipaddr6(sa1, sa2);
+ }
+ return 0;
+}
+
+/*
+ * Test if two socket addresses represent the same actual socket,
+ * by comparing (only) relevant fields, including the port number.
*/
static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
const struct sockaddr *sa2)