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[CIFS] Add IPv6 support 

IPv6 support was started a few years ago in the cifs client, but lacked a
kernel helper function for parsing the ascii form of the ipv6 address. Now
that that is added (and now IPv6 is the default that some OS use now) it
was fairly easy to finish  the cifs ipv6 support.  This  requires that
CIFS_EXPERIMENTAL be enabled and (at least until the mount.cifs module is
modified to use a new ipv6 friendly call instead of gethostbyname) and the
ipv6 address be passed on the mount as "ip=" mount option.

Thanks

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2007-04-25 11:59:10 +00:00
parent cbac3cba66
commit 5858ae44e2
3 changed files with 40 additions and 7 deletions
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8
fs/cifs/CHANGES
View File

@ -1,4 +1,10 @@
Verison 1.48
Version 1.49
------------
IPv6 support. Enable ipv6 addresses to be passed on mount (put the ipv6
address after the "ip=" mount option, at least until mount.cifs is fixed to
handle DNS host to ipv6 name translation).
Version 1.48
------------
Fix mtime bouncing around from local idea of last write times to remote time.
Fix hang (in i_size_read) when simultaneous size update of same remote file

15
fs/cifs/connect.c
View File

@ -1790,11 +1790,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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(address_type == AF_INET6) {
cFYI(1,("looking for ipv6 address"));
existingCifsSes = cifs_find_tcp_session(NULL /* no ipv4 addr */,
&sin_server6.sin6_addr,
volume_info.username, &srvTcp);
else {
} else {
kfree(volume_info.UNC);
kfree(volume_info.password);
kfree(volume_info.prepath);
@ -1810,12 +1811,18 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
sin_server.sin_port = htons(volume_info.port);
else
sin_server.sin_port = 0;
rc = ipv4_connect(&sin_server,&csocket,
if (address_type == 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);
} else
rc = ipv4_connect(&sin_server,&csocket,
volume_info.source_rfc1001_name,
volume_info.target_rfc1001_name);
if (rc < 0) {
cERROR(1,
("Error connecting to IPv4 socket. Aborting operation"));
("Error connecting to IPv4 socket. Aborting operation"));
if(csocket != NULL)
sock_release(csocket);
kfree(volume_info.UNC);

24
fs/cifs/netmisc.c
View File

@ -30,6 +30,9 @@
#include <linux/fs.h>
#include <asm/div64.h>
#include <asm/byteorder.h>
#ifdef CONFIG_CIFS_EXPERIMENTAL
#include <linux/inet.h>
#endif
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
@ -129,11 +132,27 @@ static const struct smb_to_posix_error mapping_table_ERRHRD[] = {
/* Convert string containing dotted ip address to binary form */
/* returns 0 if invalid address */
/* BB add address family, change rc to status flag and return union or for ipv6 */
/* will need parent to call something like inet_pton to convert ipv6 address BB */
int
cifs_inet_pton(int address_family, char *cp,void *dst)
{
#ifdef CONFIG_CIFS_EXPERIMENTAL
int ret = 0;
/* calculate length by finding first slash or NULL */
/* BB Should we convert '/' slash to '\' here since it seems already done
before this */
if( address_family == AF_INET ){
ret = in4_pton(cp, -1 /* len */, dst , '\\', NULL);
} else if( address_family == AF_INET6 ){
ret = in6_pton(cp, -1 /* len */, dst , '\\', NULL);
}
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1,("address conversion returned %d for %s", ret, cp));
#endif
if (ret > 0)
ret = 1;
return ret;
#else
int value;
int digit;
int i;
@ -192,6 +211,7 @@ cifs_inet_pton(int address_family, char *cp,void *dst)
*((__be32 *)dst) = *((__be32 *) bytes) | htonl(value);
return 1; /* success */
#endif /* EXPERIMENTAL */
}
/*****************************************************************************