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Date: Thu, 19 Jun 2008 15:03:35 -0400
From: Chuck Lever <chuck.lever@...cle.com>
To: netdev@...r.kernel.org
Subject: [PATCH] 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@...cle.com>
---
As part of a series of patches adding support for IPv6 addresses to the NFS
mount option parser, I'm considering this change, which includes an addition
to include/linux/inet.h. Comments?
fs/nfs/super.c | 100 +++++++++++++++++++++++++++++++++++---------------
include/linux/inet.h | 7 ++++
2 files changed, 77 insertions(+), 30 deletions(-)
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 98c8110..225b14c 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -702,38 +702,76 @@ 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))
+ if (str_len <= INET_ADDRSTRLEN) {
+ dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
+ (int)str_len, string);
+
+ sin->sin_family = AF_INET;
+ *addr_len = sizeof(*sin);
+ if (in4_pton(string, str_len, addr, '\0', NULL))
return;
- } else {
- struct sockaddr_in *ap = (struct sockaddr_in *)sap;
- u8 *addr = (u8 *)&ap->sin_addr.s_addr;
+ }
+
+ sap->sa_family = AF_UNSPEC;
+ *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);
- ap->sin_family = AF_INET;
- *len = sizeof(*ap);
- if (in4_pton(value, -1, addr, '\0', NULL))
+ sin6->sin6_family = AF_INET6;
+ *addr_len = sizeof(*sin6);
+ if (in6_pton(string, str_len, addr, '\0', NULL))
return;
}
sap->sa_family = AF_UNSPEC;
- *len = 0;
+ *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);
}
/*
@@ -1093,9 +1131,10 @@ 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:
@@ -1116,9 +1155,10 @@ 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;
diff --git a/include/linux/inet.h b/include/linux/inet.h
index 1354080..4cca05c 100644
--- a/include/linux/inet.h
+++ b/include/linux/inet.h
@@ -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);
--
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