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NFS: Add string length argument to nfs_parse_server_address 

To make nfs_parse_server_address() more generally useful, allow it to
accept input strings that are not terminated with '\0'.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2008-06-23 12:36:53 -04:00 committed by Trond Myklebust
parent d1aa082573
commit ce3b7e1906
2 changed files with 78 additions and 31 deletions
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102
fs/nfs/super.c
View File

@ -705,38 +705,76 @@ static int nfs_verify_server_address(struct sockaddr *addr)
return 0;
}
/*
* Parse string addresses passed in via a mount option,
* and construct a sockaddr based on the result.
*
* If address parsing fails, set the sockaddr's address
* family to AF_UNSPEC to force nfs_verify_server_address()
* to punt the mount.
*/
static void nfs_parse_server_address(char *value,
struct sockaddr *sap,
size_t *len)
static void nfs_parse_ipv4_address(char *string, size_t str_len,
struct sockaddr *sap, size_t *addr_len)
{
if (strchr(value, ':')) {
struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
struct sockaddr_in *sin = (struct sockaddr_in *)sap;
u8 *addr = (u8 *)&sin->sin_addr.s_addr;
ap->sin6_family = AF_INET6;
*len = sizeof(*ap);
if (in6_pton(value, -1, addr, '\0', NULL))
return;
} else {
struct sockaddr_in *ap = (struct sockaddr_in *)sap;
u8 *addr = (u8 *)&ap->sin_addr.s_addr;
if (str_len <= INET_ADDRSTRLEN) {
dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
(int)str_len, string);
ap->sin_family = AF_INET;
*len = sizeof(*ap);
if (in4_pton(value, -1, addr, '\0', NULL))
sin->sin_family = AF_INET;
*addr_len = sizeof(*sin);
if (in4_pton(string, str_len, addr, '\0', NULL))
return;
}
sap->sa_family = AF_UNSPEC;
*len = 0;
*addr_len = 0;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static void nfs_parse_ipv6_address(char *string, size_t str_len,
struct sockaddr *sap, size_t *addr_len)
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
if (str_len <= INET6_ADDRSTRLEN) {
dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
(int)str_len, string);
sin6->sin6_family = AF_INET6;
*addr_len = sizeof(*sin6);
if (in6_pton(string, str_len, addr, '\0', NULL))
return;
}
sap->sa_family = AF_UNSPEC;
*addr_len = 0;
}
#else
static void nfs_parse_ipv6_address(char *string, size_t str_len,
struct sockaddr *sap, size_t *addr_len)
{
sap->sa_family = AF_UNSPEC;
*addr_len = 0;
}
#endif
/*
* Construct a sockaddr based on the contents of a string that contains
* an IP address in presentation format.
*
* If there is a problem constructing the new sockaddr, set the address
* family to AF_UNSPEC.
*/
static void nfs_parse_ip_address(char *string, size_t str_len,
struct sockaddr *sap, size_t *addr_len)
{
unsigned int i, colons;
colons = 0;
for (i = 0; i < str_len; i++)
if (string[i] == ':')
colons++;
if (colons >= 2)
nfs_parse_ipv6_address(string, str_len, sap, addr_len);
else
nfs_parse_ipv4_address(string, str_len, sap, addr_len);
}
/*
@ -1070,9 +1108,10 @@ static int nfs_parse_mount_options(char *raw,
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
nfs_parse_server_address(string, (struct sockaddr *)
&mnt->nfs_server.address,
&mnt->nfs_server.addrlen);
nfs_parse_ip_address(string, strlen(string),
(struct sockaddr *)
&mnt->nfs_server.address,
&mnt->nfs_server.addrlen);
kfree(string);
break;
case Opt_clientaddr:
@ -1093,9 +1132,10 @@ static int nfs_parse_mount_options(char *raw,
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
nfs_parse_server_address(string, (struct sockaddr *)
&mnt->mount_server.address,
&mnt->mount_server.addrlen);
nfs_parse_ip_address(string, strlen(string),
(struct sockaddr *)
&mnt->mount_server.address,
&mnt->mount_server.addrlen);
kfree(string);
break;

7
include/linux/inet.h
View File

@ -44,6 +44,13 @@
#include <linux/types.h>
/*
* These mimic similar macros defined in user-space for inet_ntop(3).
* See /usr/include/netinet/in.h .
*/
#define INET_ADDRSTRLEN (16)
#define INET6_ADDRSTRLEN (48)
extern __be32 in_aton(const char *str);
extern int in4_pton(const char *src, int srclen, u8 *dst, int delim, const char **end);
extern int in6_pton(const char *src, int srclen, u8 *dst, int delim, const char **end);