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Message-ID: <20080929221608.GA6116@boomer>
Date: Mon, 29 Sep 2008 17:16:11 -0500
From: Tyler Hicks <tyhicks@...ux.vnet.ibm.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Michael Halcrow <mhalcrow@...ibm.com>,
Dustin Kirkland <kirkland@...onical.com>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] eCryptfs: Remove netlink transport
The netlink transport code has not worked for a while and the miscdev
transport is a simpler solution. This patch removes the netlink
code and makes the miscdev transport the only eCryptfs kernel to
userspace transport.
Signed-off-by: Tyler Hicks <tyhicks@...ux.vnet.ibm.com>
---
fs/ecryptfs/Makefile | 2 +-
fs/ecryptfs/ecryptfs_kernel.h | 28 +----
fs/ecryptfs/keystore.c | 32 +++---
fs/ecryptfs/main.c | 19 ++--
fs/ecryptfs/messaging.c | 118 +++++--------------
fs/ecryptfs/netlink.c | 249 -----------------------------------------
6 files changed, 60 insertions(+), 388 deletions(-)
delete mode 100644 fs/ecryptfs/netlink.c
diff --git a/fs/ecryptfs/Makefile b/fs/ecryptfs/Makefile
index b4755a8..2cc9ee4 100644
--- a/fs/ecryptfs/Makefile
+++ b/fs/ecryptfs/Makefile
@@ -4,4 +4,4 @@
obj-$(CONFIG_ECRYPT_FS) += ecryptfs.o
-ecryptfs-objs := dentry.o file.o inode.o main.o super.o mmap.o read_write.o crypto.o keystore.o messaging.o netlink.o miscdev.o kthread.o debug.o
+ecryptfs-objs := dentry.o file.o inode.o main.o super.o mmap.o read_write.o crypto.o keystore.o messaging.o miscdev.o kthread.o debug.o
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index e73414f..a75026d 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -79,11 +79,6 @@
#define ECRYPTFS_MAX_PKI_NAME_BYTES 16
#define ECRYPTFS_DEFAULT_NUM_USERS 4
#define ECRYPTFS_MAX_NUM_USERS 32768
-#define ECRYPTFS_TRANSPORT_NETLINK 0
-#define ECRYPTFS_TRANSPORT_CONNECTOR 1
-#define ECRYPTFS_TRANSPORT_RELAYFS 2
-#define ECRYPTFS_TRANSPORT_MISCDEV 3
-#define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_MISCDEV
#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
#define RFC2440_CIPHER_DES3_EDE 0x02
@@ -400,8 +395,6 @@ struct ecryptfs_msg_ctx {
struct mutex mux;
};
-extern unsigned int ecryptfs_transport;
-
struct ecryptfs_daemon;
struct ecryptfs_daemon {
@@ -627,31 +620,20 @@ int
ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags);
int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
-int ecryptfs_process_helo(unsigned int transport, uid_t euid,
- struct user_namespace *user_ns, struct pid *pid);
+int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
+ struct pid *pid);
int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
struct pid *pid);
int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
struct user_namespace *user_ns, struct pid *pid,
u32 seq);
-int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
+int ecryptfs_send_message(char *data, int data_len,
struct ecryptfs_msg_ctx **msg_ctx);
int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
struct ecryptfs_message **emsg);
-int ecryptfs_init_messaging(unsigned int transport);
-void ecryptfs_release_messaging(unsigned int transport);
+int ecryptfs_init_messaging(void);
+void ecryptfs_release_messaging(void);
-int ecryptfs_send_netlink(char *data, int data_len,
- struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
- u16 msg_flags, struct pid *daemon_pid);
-int ecryptfs_init_netlink(void);
-void ecryptfs_release_netlink(void);
-
-int ecryptfs_send_connector(char *data, int data_len,
- struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
- u16 msg_flags, struct pid *daemon_pid);
-int ecryptfs_init_connector(void);
-void ecryptfs_release_connector(void);
void
ecryptfs_write_header_metadata(char *virt,
struct ecryptfs_crypt_stat *crypt_stat,
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index f5b76a3..e22bc39 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -234,8 +234,8 @@ parse_tag_65_packet(struct ecryptfs_session_key *session_key, u8 *cipher_code,
}
i += data_len;
if (message_len < (i + m_size)) {
- ecryptfs_printk(KERN_ERR, "The received netlink message is "
- "shorter than expected\n");
+ ecryptfs_printk(KERN_ERR, "The message received from ecryptfsd "
+ "is shorter than expected\n");
rc = -EIO;
goto out;
}
@@ -438,8 +438,8 @@ decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
struct ecryptfs_msg_ctx *msg_ctx;
struct ecryptfs_message *msg = NULL;
char *auth_tok_sig;
- char *netlink_message;
- size_t netlink_message_length;
+ char *payload;
+ size_t payload_len;
int rc;
rc = ecryptfs_get_auth_tok_sig(&auth_tok_sig, auth_tok);
@@ -449,15 +449,15 @@ decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
goto out;
}
rc = write_tag_64_packet(auth_tok_sig, &(auth_tok->session_key),
- &netlink_message, &netlink_message_length);
+ &payload, &payload_len);
if (rc) {
ecryptfs_printk(KERN_ERR, "Failed to write tag 64 packet\n");
goto out;
}
- rc = ecryptfs_send_message(ecryptfs_transport, netlink_message,
- netlink_message_length, &msg_ctx);
+ rc = ecryptfs_send_message(payload, payload_len, &msg_ctx);
if (rc) {
- ecryptfs_printk(KERN_ERR, "Error sending netlink message\n");
+ ecryptfs_printk(KERN_ERR, "Error sending message to "
+ "ecryptfsd\n");
goto out;
}
rc = ecryptfs_wait_for_response(msg_ctx, &msg);
@@ -1333,23 +1333,22 @@ pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok,
struct ecryptfs_key_record *key_rec)
{
struct ecryptfs_msg_ctx *msg_ctx = NULL;
- char *netlink_payload;
- size_t netlink_payload_length;
+ char *payload = NULL;
+ size_t payload_len;
struct ecryptfs_message *msg;
int rc;
rc = write_tag_66_packet(auth_tok->token.private_key.signature,
ecryptfs_code_for_cipher_string(crypt_stat),
- crypt_stat, &netlink_payload,
- &netlink_payload_length);
+ crypt_stat, &payload, &payload_len);
if (rc) {
ecryptfs_printk(KERN_ERR, "Error generating tag 66 packet\n");
goto out;
}
- rc = ecryptfs_send_message(ecryptfs_transport, netlink_payload,
- netlink_payload_length, &msg_ctx);
+ rc = ecryptfs_send_message(payload, payload_len, &msg_ctx);
if (rc) {
- ecryptfs_printk(KERN_ERR, "Error sending netlink message\n");
+ ecryptfs_printk(KERN_ERR, "Error sending message to "
+ "ecryptfsd\n");
goto out;
}
rc = ecryptfs_wait_for_response(msg_ctx, &msg);
@@ -1364,8 +1363,7 @@ pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok,
ecryptfs_printk(KERN_ERR, "Error parsing tag 67 packet\n");
kfree(msg);
out:
- if (netlink_payload)
- kfree(netlink_payload);
+ kfree(payload);
return rc;
}
/**
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 499643f..fd63071 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -30,7 +30,6 @@
#include <linux/namei.h>
#include <linux/skbuff.h>
#include <linux/crypto.h>
-#include <linux/netlink.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/key.h>
@@ -49,8 +48,7 @@ MODULE_PARM_DESC(ecryptfs_verbosity,
"0, which is Quiet)");
/**
- * Module parameter that defines the number of netlink message buffer
- * elements
+ * Module parameter that defines the number of message buffer elements
*/
unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
@@ -60,9 +58,9 @@ MODULE_PARM_DESC(ecryptfs_message_buf_len,
/**
* Module parameter that defines the maximum guaranteed amount of time to wait
- * for a response through netlink. The actual sleep time will be, more than
+ * for a response from ecryptfsd. The actual sleep time will be, more than
* likely, a small amount greater than this specified value, but only less if
- * the netlink message successfully arrives.
+ * the message successfully arrives.
*/
signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
@@ -83,8 +81,6 @@ module_param(ecryptfs_number_of_users, uint, 0);
MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
"concurrent users of eCryptfs");
-unsigned int ecryptfs_transport = ECRYPTFS_DEFAULT_TRANSPORT;
-
void __ecryptfs_printk(const char *fmt, ...)
{
va_list args;
@@ -775,10 +771,11 @@ static int __init ecryptfs_init(void)
"rc = [%d]\n", __func__, rc);
goto out_do_sysfs_unregistration;
}
- rc = ecryptfs_init_messaging(ecryptfs_transport);
+ rc = ecryptfs_init_messaging();
if (rc) {
printk(KERN_ERR "Failure occured while attempting to "
- "initialize the eCryptfs netlink socket\n");
+ "initialize the communications channel to "
+ "ecryptfsd\n");
goto out_destroy_kthread;
}
rc = ecryptfs_init_crypto();
@@ -793,7 +790,7 @@ static int __init ecryptfs_init(void)
goto out;
out_release_messaging:
- ecryptfs_release_messaging(ecryptfs_transport);
+ ecryptfs_release_messaging();
out_destroy_kthread:
ecryptfs_destroy_kthread();
out_do_sysfs_unregistration:
@@ -814,7 +811,7 @@ static void __exit ecryptfs_exit(void)
if (rc)
printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
"rc = [%d]\n", rc);
- ecryptfs_release_messaging(ecryptfs_transport);
+ ecryptfs_release_messaging();
ecryptfs_destroy_kthread();
do_sysfs_unregistration();
unregister_filesystem(&ecryptfs_fs_type);
diff --git a/fs/ecryptfs/messaging.c b/fs/ecryptfs/messaging.c
index 92bf606..e0b0a4e 100644
--- a/fs/ecryptfs/messaging.c
+++ b/fs/ecryptfs/messaging.c
@@ -134,12 +134,11 @@ out:
}
static int
-ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
- u8 msg_type, struct ecryptfs_msg_ctx **msg_ctx);
+ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
+ struct ecryptfs_msg_ctx **msg_ctx);
/**
* ecryptfs_send_raw_message
- * @transport: Transport type
* @msg_type: Message type
* @daemon: Daemon struct for recipient of message
*
@@ -150,38 +149,25 @@ ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
*
* Returns zero on success; non-zero otherwise
*/
-static int ecryptfs_send_raw_message(unsigned int transport, u8 msg_type,
+static int ecryptfs_send_raw_message(u8 msg_type,
struct ecryptfs_daemon *daemon)
{
struct ecryptfs_msg_ctx *msg_ctx;
int rc;
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_send_netlink(NULL, 0, NULL, msg_type, 0,
- daemon->pid);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_send_message_locked(transport, NULL, 0, msg_type,
- &msg_ctx);
- if (rc) {
- printk(KERN_ERR "%s: Error whilst attempting to send "
- "message via procfs; rc = [%d]\n", __func__, rc);
- goto out;
- }
- /* Raw messages are logically context-free (e.g., no
- * reply is expected), so we set the state of the
- * ecryptfs_msg_ctx object to indicate that it should
- * be freed as soon as the transport sends out the message. */
- mutex_lock(&msg_ctx->mux);
- msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_NO_REPLY;
- mutex_unlock(&msg_ctx->mux);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
+ rc = ecryptfs_send_message_locked(NULL, 0, msg_type, &msg_ctx);
+ if (rc) {
+ printk(KERN_ERR "%s: Error whilst attempting to send "
+ "message to ecryptfsd; rc = [%d]\n", __func__, rc);
+ goto out;
}
+ /* Raw messages are logically context-free (e.g., no
+ * reply is expected), so we set the state of the
+ * ecryptfs_msg_ctx object to indicate that it should
+ * be freed as soon as the message is sent. */
+ mutex_lock(&msg_ctx->mux);
+ msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_NO_REPLY;
+ mutex_unlock(&msg_ctx->mux);
out:
return rc;
}
@@ -227,7 +213,6 @@ out:
/**
* ecryptfs_process_helo
- * @transport: The underlying transport (netlink, etc.)
* @euid: The user ID owner of the message
* @user_ns: The namespace in which @euid applies
* @pid: The process ID for the userspace program that sent the
@@ -239,8 +224,8 @@ out:
* Returns zero after adding a new daemon to the hash list;
* non-zero otherwise.
*/
-int ecryptfs_process_helo(unsigned int transport, uid_t euid,
- struct user_namespace *user_ns, struct pid *pid)
+int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
+ struct pid *pid)
{
struct ecryptfs_daemon *new_daemon;
struct ecryptfs_daemon *old_daemon;
@@ -252,8 +237,7 @@ int ecryptfs_process_helo(unsigned int transport, uid_t euid,
printk(KERN_WARNING "Received request from user [%d] "
"to register daemon [0x%p]; unregistering daemon "
"[0x%p]\n", euid, pid, old_daemon->pid);
- rc = ecryptfs_send_raw_message(transport, ECRYPTFS_MSG_QUIT,
- old_daemon);
+ rc = ecryptfs_send_raw_message(ECRYPTFS_MSG_QUIT, old_daemon);
if (rc)
printk(KERN_WARNING "Failed to send QUIT "
"message to daemon [0x%p]; rc = [%d]\n",
@@ -468,8 +452,6 @@ out:
/**
* ecryptfs_send_message_locked
- * @transport: The transport over which to send the message (i.e.,
- * netlink)
* @data: The data to send
* @data_len: The length of data
* @msg_ctx: The message context allocated for the send
@@ -479,8 +461,8 @@ out:
* Returns zero on success; non-zero otherwise
*/
static int
-ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
- u8 msg_type, struct ecryptfs_msg_ctx **msg_ctx)
+ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
+ struct ecryptfs_msg_ctx **msg_ctx)
{
struct ecryptfs_daemon *daemon;
uid_t euid = current_euid();
@@ -505,20 +487,8 @@ ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
ecryptfs_msg_ctx_free_to_alloc(*msg_ctx);
mutex_unlock(&(*msg_ctx)->mux);
mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
- switch (transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_send_netlink(data, data_len, *msg_ctx, msg_type,
- 0, daemon->pid);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type,
- 0, daemon);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
- }
+ rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type, 0,
+ daemon);
if (rc)
printk(KERN_ERR "%s: Error attempting to send message to "
"userspace daemon; rc = [%d]\n", __func__, rc);
@@ -528,8 +498,6 @@ out:
/**
* ecryptfs_send_message
- * @transport: The transport over which to send the message (i.e.,
- * netlink)
* @data: The data to send
* @data_len: The length of data
* @msg_ctx: The message context allocated for the send
@@ -538,14 +506,14 @@ out:
*
* Returns zero on success; non-zero otherwise
*/
-int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
+int ecryptfs_send_message(char *data, int data_len,
struct ecryptfs_msg_ctx **msg_ctx)
{
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
- rc = ecryptfs_send_message_locked(transport, data, data_len,
- ECRYPTFS_MSG_REQUEST, msg_ctx);
+ rc = ecryptfs_send_message_locked(data, data_len, ECRYPTFS_MSG_REQUEST,
+ msg_ctx);
mutex_unlock(&ecryptfs_daemon_hash_mux);
return rc;
}
@@ -588,7 +556,7 @@ sleep:
return rc;
}
-int ecryptfs_init_messaging(unsigned int transport)
+int ecryptfs_init_messaging(void)
{
int i;
int rc = 0;
@@ -641,27 +609,14 @@ int ecryptfs_init_messaging(unsigned int transport)
mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
}
mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_init_netlink();
- if (rc)
- ecryptfs_release_messaging(transport);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_init_ecryptfs_miscdev();
- if (rc)
- ecryptfs_release_messaging(transport);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
- }
+ rc = ecryptfs_init_ecryptfs_miscdev();
+ if (rc)
+ ecryptfs_release_messaging();
out:
return rc;
}
-void ecryptfs_release_messaging(unsigned int transport)
+void ecryptfs_release_messaging(void)
{
if (ecryptfs_msg_ctx_arr) {
int i;
@@ -700,17 +655,6 @@ void ecryptfs_release_messaging(unsigned int transport)
kfree(ecryptfs_daemon_hash);
mutex_unlock(&ecryptfs_daemon_hash_mux);
}
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- ecryptfs_release_netlink();
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- ecryptfs_destroy_ecryptfs_miscdev();
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- break;
- }
+ ecryptfs_destroy_ecryptfs_miscdev();
return;
}
diff --git a/fs/ecryptfs/netlink.c b/fs/ecryptfs/netlink.c
deleted file mode 100644
index e0abad6..0000000
--- a/fs/ecryptfs/netlink.c
+++ /dev/null
@@ -1,249 +0,0 @@
-/**
- * eCryptfs: Linux filesystem encryption layer
- *
- * Copyright (C) 2004-2006 International Business Machines Corp.
- * Author(s): Michael A. Halcrow <mhalcrow@...ibm.com>
- * Tyler Hicks <tyhicks@...edu>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version
- * 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
-
-#include <net/sock.h>
-#include <linux/hash.h>
-#include <linux/random.h>
-#include "ecryptfs_kernel.h"
-
-static struct sock *ecryptfs_nl_sock;
-
-/**
- * ecryptfs_send_netlink
- * @data: The data to include as the payload
- * @data_len: The byte count of the data
- * @msg_ctx: The netlink context that will be used to handle the
- * response message
- * @msg_type: The type of netlink message to send
- * @msg_flags: The flags to include in the netlink header
- * @daemon_pid: The process id of the daemon to send the message to
- *
- * Sends the data to the specified daemon pid and uses the netlink
- * context element to store the data needed for validation upon
- * receiving the response. The data and the netlink context can be
- * null if just sending a netlink header is sufficient. Returns zero
- * upon sending the message; non-zero upon error.
- */
-int ecryptfs_send_netlink(char *data, int data_len,
- struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
- u16 msg_flags, struct pid *daemon_pid)
-{
- struct sk_buff *skb;
- struct nlmsghdr *nlh;
- struct ecryptfs_message *msg;
- size_t payload_len;
- int rc;
-
- payload_len = ((data && data_len) ? (sizeof(*msg) + data_len) : 0);
- skb = alloc_skb(NLMSG_SPACE(payload_len), GFP_KERNEL);
- if (!skb) {
- rc = -ENOMEM;
- ecryptfs_printk(KERN_ERR, "Failed to allocate socket buffer\n");
- goto out;
- }
- nlh = NLMSG_PUT(skb, pid_nr(daemon_pid), msg_ctx ? msg_ctx->counter : 0,
- msg_type, payload_len);
- nlh->nlmsg_flags = msg_flags;
- if (msg_ctx && payload_len) {
- msg = (struct ecryptfs_message *)NLMSG_DATA(nlh);
- msg->index = msg_ctx->index;
- msg->data_len = data_len;
- memcpy(msg->data, data, data_len);
- }
- rc = netlink_unicast(ecryptfs_nl_sock, skb, pid_nr(daemon_pid), 0);
- if (rc < 0) {
- ecryptfs_printk(KERN_ERR, "Failed to send eCryptfs netlink "
- "message; rc = [%d]\n", rc);
- goto out;
- }
- rc = 0;
- goto out;
-nlmsg_failure:
- rc = -EMSGSIZE;
- kfree_skb(skb);
-out:
- return rc;
-}
-
-/**
- * ecryptfs_process_nl_reponse
- * @skb: The socket buffer containing the netlink message of state
- * RESPONSE
- *
- * Processes a response message after sending a operation request to
- * userspace. Attempts to assign the msg to a netlink context element
- * at the index specified in the msg. The sk_buff and nlmsghdr must
- * be validated before this function. Returns zero upon delivery to
- * desired context element; non-zero upon delivery failure or error.
- */
-static int ecryptfs_process_nl_response(struct sk_buff *skb)
-{
- struct nlmsghdr *nlh = nlmsg_hdr(skb);
- struct ecryptfs_message *msg = NLMSG_DATA(nlh);
- struct pid *pid;
- int rc;
-
- if (skb->len - NLMSG_HDRLEN - sizeof(*msg) != msg->data_len) {
- rc = -EINVAL;
- ecryptfs_printk(KERN_ERR, "Received netlink message with "
- "incorrectly specified data length\n");
- goto out;
- }
- pid = find_get_pid(NETLINK_CREDS(skb)->pid);
- rc = ecryptfs_process_response(msg, NETLINK_CREDS(skb)->uid, NULL,
- pid, nlh->nlmsg_seq);
- put_pid(pid);
- if (rc)
- printk(KERN_ERR
- "Error processing response message; rc = [%d]\n", rc);
-out:
- return rc;
-}
-
-/**
- * ecryptfs_process_nl_helo
- * @skb: The socket buffer containing the nlmsghdr in HELO state
- *
- * Gets uid and pid of the skb and adds the values to the daemon id
- * hash. Returns zero after adding a new daemon id to the hash list;
- * non-zero otherwise.
- */
-static int ecryptfs_process_nl_helo(struct sk_buff *skb)
-{
- struct pid *pid;
- int rc;
-
- pid = find_get_pid(NETLINK_CREDS(skb)->pid);
- rc = ecryptfs_process_helo(ECRYPTFS_TRANSPORT_NETLINK,
- NETLINK_CREDS(skb)->uid, NULL, pid);
- put_pid(pid);
- if (rc)
- printk(KERN_WARNING "Error processing HELO; rc = [%d]\n", rc);
- return rc;
-}
-
-/**
- * ecryptfs_process_nl_quit
- * @skb: The socket buffer containing the nlmsghdr in QUIT state
- *
- * Gets uid and pid of the skb and deletes the corresponding daemon
- * id, if it is the registered that is requesting the
- * deletion. Returns zero after deleting the desired daemon id;
- * non-zero otherwise.
- */
-static int ecryptfs_process_nl_quit(struct sk_buff *skb)
-{
- struct pid *pid;
- int rc;
-
- pid = find_get_pid(NETLINK_CREDS(skb)->pid);
- rc = ecryptfs_process_quit(NETLINK_CREDS(skb)->uid, NULL, pid);
- put_pid(pid);
- if (rc)
- printk(KERN_WARNING
- "Error processing QUIT message; rc = [%d]\n", rc);
- return rc;
-}
-
-/**
- * ecryptfs_receive_nl_message
- *
- * Callback function called by netlink system when a message arrives.
- * If the message looks to be valid, then an attempt is made to assign
- * it to its desired netlink context element and wake up the process
- * that is waiting for a response.
- */
-static void ecryptfs_receive_nl_message(struct sk_buff *skb)
-{
- struct nlmsghdr *nlh;
-
- nlh = nlmsg_hdr(skb);
- if (!NLMSG_OK(nlh, skb->len)) {
- ecryptfs_printk(KERN_ERR, "Received corrupt netlink "
- "message\n");
- goto free;
- }
- switch (nlh->nlmsg_type) {
- case ECRYPTFS_MSG_RESPONSE:
- if (ecryptfs_process_nl_response(skb)) {
- ecryptfs_printk(KERN_WARNING, "Failed to "
- "deliver netlink response to "
- "requesting operation\n");
- }
- break;
- case ECRYPTFS_MSG_HELO:
- if (ecryptfs_process_nl_helo(skb)) {
- ecryptfs_printk(KERN_WARNING, "Failed to "
- "fulfill HELO request\n");
- }
- break;
- case ECRYPTFS_MSG_QUIT:
- if (ecryptfs_process_nl_quit(skb)) {
- ecryptfs_printk(KERN_WARNING, "Failed to "
- "fulfill QUIT request\n");
- }
- break;
- default:
- ecryptfs_printk(KERN_WARNING, "Dropping netlink "
- "message of unrecognized type [%d]\n",
- nlh->nlmsg_type);
- break;
- }
-free:
- kfree_skb(skb);
-}
-
-/**
- * ecryptfs_init_netlink
- *
- * Initializes the daemon id hash list, netlink context array, and
- * necessary locks. Returns zero upon success; non-zero upon error.
- */
-int ecryptfs_init_netlink(void)
-{
- int rc;
-
- ecryptfs_nl_sock = netlink_kernel_create(&init_net, NETLINK_ECRYPTFS, 0,
- ecryptfs_receive_nl_message,
- NULL, THIS_MODULE);
- if (!ecryptfs_nl_sock) {
- rc = -EIO;
- ecryptfs_printk(KERN_ERR, "Failed to create netlink socket\n");
- goto out;
- }
- ecryptfs_nl_sock->sk_sndtimeo = ECRYPTFS_DEFAULT_SEND_TIMEOUT;
- rc = 0;
-out:
- return rc;
-}
-
-/**
- * ecryptfs_release_netlink
- *
- * Frees all memory used by the netlink context array and releases the
- * netlink socket.
- */
-void ecryptfs_release_netlink(void)
-{
- netlink_kernel_release(ecryptfs_nl_sock);
- ecryptfs_nl_sock = NULL;
-}
--
1.5.3.7
--
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