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[CIFS] clean up server protocol handling
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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>
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Steve French committed Nov 14, 2008
1 parent fb39601 commit 3ec332e
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Showing 3 changed files with 33 additions and 31 deletions.
4 changes: 2 additions & 2 deletions fs/cifs/cifs_spnego.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down
3 changes: 1 addition & 2 deletions fs/cifs/cifsglob.h
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Original file line number Diff line number Diff line change
Expand Up @@ -85,8 +85,7 @@ enum securityEnum {
};

enum protocolEnum {
IPV4 = 0,
IPV6,
TCP = 0,
SCTP
/* Netbios frames protocol not supported at this time */
};
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57 changes: 30 additions & 27 deletions fs/cifs/connect.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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 {
Expand Down Expand Up @@ -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;
Expand All @@ -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;
Expand All @@ -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) {
Expand Down Expand Up @@ -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);
Expand All @@ -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);
Expand Down Expand Up @@ -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) {
Expand Down Expand Up @@ -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"));
Expand Down

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