[CIFS] clean up server protocol handling

We're currently declaring both a sockaddr_in and sockaddr6_in on the
stack, but we really only need storage for one of them. Declare a
sockaddr struct and cast it to the proper type. Also, eliminate the
protocolType field in the TCP_Server_Info struct. It's redundant since
we have a sa_family field in the sockaddr anyway.

We may need to revisit this if SCTP is ever implemented, but for now
this will simplify the code.

CIFS over IPv6 also has a number of problems currently. This fixes all
of them that I found. Eventually, it would be nice to move more of the
code to be protocol independent, but this is a start.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

3 files changed, 33 insertions, 31 deletions

diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c
index fcee9298b620..0ab2fb5afef1 100644
--- a/fs/cifs/cifs_spnego.c
+++ b/fs/cifs/cifs_spnego.c
@@ -73,8 +73,8 @@ struct key_type cifs_spnego_key_type = {
  * strlen(";sec=ntlmsspi") */
 #define MAX_MECH_STR_LEN        13
 
-/* max possible addr len eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/60 */
-#define MAX_IPV6_ADDR_LEN       42
+/* max possible addr len eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/128 */
+#define MAX_IPV6_ADDR_LEN       43
 
 /* strlen of "host=" */
 #define HOST_KEY_LEN            5
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d6357dc1be72..13dc48414a78 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -85,8 +85,7 @@ enum securityEnum {
 };
 
 enum protocolEnum {
-        IPV4 = 0,
-        IPV6,
+        TCP = 0,
         SCTP
         /* Netbios frames protocol not supported at this time */
 };
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index c1cd1217c990..30ab8dc68e17 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -193,7 +193,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
         while ((server->tcpStatus != CifsExiting) &&
                (server->tcpStatus != CifsGood)) {
                 try_to_freeze();
-                if (server->protocolType == IPV6) {
+                if (server->addr.sockAddr6.sin6_family == AF_INET6) {
                         rc = ipv6_connect(&server->addr.sockAddr6,
                                           &server->ssocket, server->noautotune);
                 } else {
@@ -1983,10 +1983,10 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 {
         int rc = 0;
         int xid;
-        int address_type = AF_INET;
         struct socket *csocket = NULL;
-        struct sockaddr_in sin_server;
-        struct sockaddr_in6 sin_server6;
+        struct sockaddr addr;
+        struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
+        struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
         struct smb_vol volume_info;
         struct cifsSesInfo *pSesInfo = NULL;
         struct cifsSesInfo *existingCifsSes = NULL;
@@ -1997,6 +1997,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 /* cFYI(1, ("Entering cifs_mount. Xid: %d with: %s", xid, mount_data)); */
 
+        memset(&addr, 0, sizeof(struct sockaddr));
         memset(&volume_info, 0, sizeof(struct smb_vol));
         if (cifs_parse_mount_options(mount_data, devname, &volume_info)) {
                 rc = -EINVAL;
@@ -2019,16 +2020,16 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
         if (volume_info.UNCip && volume_info.UNC) {
                 rc = cifs_inet_pton(AF_INET, volume_info.UNCip,
-                                    &sin_server.sin_addr.s_addr);
+                                    &sin_server->sin_addr.s_addr);
 
                 if (rc <= 0) {
                         /* not ipv4 address, try ipv6 */
                         rc = cifs_inet_pton(AF_INET6, volume_info.UNCip,
-                                            &sin_server6.sin6_addr.in6_u);
+                                            &sin_server6->sin6_addr.in6_u);
                         if (rc > 0)
-                                address_type = AF_INET6;
+                                addr.sa_family = AF_INET6;
                 } else {
-                        address_type = AF_INET;
+                        addr.sa_family = AF_INET;
                 }
 
                 if (rc <= 0) {
@@ -2068,39 +2069,38 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                 }
         }
 
-        if (address_type == AF_INET)
-                existingCifsSes = cifs_find_tcp_session(&sin_server.sin_addr,
+        if (addr.sa_family == AF_INET)
+                existingCifsSes = cifs_find_tcp_session(&sin_server->sin_addr,
                         NULL /* no ipv6 addr */,
                         volume_info.username, &srvTcp);
-        else if (address_type == AF_INET6) {
+        else if (addr.sa_family == AF_INET6) {
                 cFYI(1, ("looking for ipv6 address"));
                 existingCifsSes = cifs_find_tcp_session(NULL /* no ipv4 addr */,
-                        &sin_server6.sin6_addr,
+                        &sin_server6->sin6_addr,
                         volume_info.username, &srvTcp);
         } else {
                 rc = -EINVAL;
                 goto out;
         }
 
-        if (!srvTcp) {  /* create socket */
-                if (volume_info.port)
-                        sin_server.sin_port = htons(volume_info.port);
-                else
-                        sin_server.sin_port = 0;
-                if (address_type == AF_INET6) {
+        if (!srvTcp) {
+                if (addr.sa_family == AF_INET6) {
                         cFYI(1, ("attempting ipv6 connect"));
                         /* BB should we allow ipv6 on port 139? */
                         /* other OS never observed in Wild doing 139 with v6 */
-                        rc = ipv6_connect(&sin_server6, &csocket,
+                        sin_server6->sin6_port = htons(volume_info.port);
+                        rc = ipv6_connect(sin_server6, &csocket,
                                         volume_info.noblocksnd);
-                } else
-                        rc = ipv4_connect(&sin_server, &csocket,
+                } else {
+                        sin_server->sin_port = htons(volume_info.port);
+                        rc = ipv4_connect(sin_server, &csocket,
                                   volume_info.source_rfc1001_name,
                                   volume_info.target_rfc1001_name,
                                   volume_info.noblocksnd,
                                   volume_info.noautotune);
+                }
                 if (rc < 0) {
-                        cERROR(1, ("Error connecting to IPv4 socket. "
+                        cERROR(1, ("Error connecting to socket. "
                                    "Aborting operation"));
                         if (csocket != NULL)
                                 sock_release(csocket);
@@ -2115,12 +2115,15 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                 } else {
                         srvTcp->noblocksnd = volume_info.noblocksnd;
                         srvTcp->noautotune = volume_info.noautotune;
-                        memcpy(&srvTcp->addr.sockAddr, &sin_server,
-                                sizeof(struct sockaddr_in));
+                        if (addr.sa_family == AF_INET6)
+                                memcpy(&srvTcp->addr.sockAddr6, sin_server6,
+                                        sizeof(struct sockaddr_in6));
+                        else
+                                memcpy(&srvTcp->addr.sockAddr, sin_server,
+                                        sizeof(struct sockaddr_in));
                         atomic_set(&srvTcp->inFlight, 0);
                         /* BB Add code for ipv6 case too */
                         srvTcp->ssocket = csocket;
-                        srvTcp->protocolType = IPV4;
                         srvTcp->hostname = extract_hostname(volume_info.UNC);
                         if (IS_ERR(srvTcp->hostname)) {
                                 rc = PTR_ERR(srvTcp->hostname);
@@ -2172,7 +2175,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                 else {
                         pSesInfo->server = srvTcp;
                         sprintf(pSesInfo->serverName, "%u.%u.%u.%u",
-                                NIPQUAD(sin_server.sin_addr.s_addr));
+                                NIPQUAD(sin_server->sin_addr.s_addr));
                 }
 
                 if (!rc) {
@@ -2211,7 +2214,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                 setup_cifs_sb(&volume_info, cifs_sb);
 
                 tcon =
-                    find_unc(sin_server.sin_addr.s_addr, volume_info.UNC,
+                    find_unc(sin_server->sin_addr.s_addr, volume_info.UNC,
                              volume_info.username);
                 if (tcon) {
                         cFYI(1, ("Found match on UNC path"));