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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@linux.vnet.ibm.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dustin Kirkland <kirkland@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tyler Hicks
Linus Torvalds
parent
807b7ebe41
commit
624ae52845
6 changed files with 60 additions and 388 deletions
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@ -4,4 +4,4 @@
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obj-$(CONFIG_ECRYPT_FS) += ecryptfs.o
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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
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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
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@ -79,11 +79,6 @@
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#define ECRYPTFS_MAX_PKI_NAME_BYTES 16
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#define ECRYPTFS_DEFAULT_NUM_USERS 4
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#define ECRYPTFS_MAX_NUM_USERS 32768
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#define ECRYPTFS_TRANSPORT_NETLINK 0
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#define ECRYPTFS_TRANSPORT_CONNECTOR 1
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#define ECRYPTFS_TRANSPORT_RELAYFS 2
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#define ECRYPTFS_TRANSPORT_MISCDEV 3
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#define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_MISCDEV
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#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
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#define RFC2440_CIPHER_DES3_EDE 0x02
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@ -400,8 +395,6 @@ struct ecryptfs_msg_ctx {
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struct mutex mux;
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};
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extern unsigned int ecryptfs_transport;
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struct ecryptfs_daemon;
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struct ecryptfs_daemon {
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@ -627,31 +620,20 @@ int
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ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
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size_t size, int flags);
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int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
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int ecryptfs_process_helo(unsigned int transport, uid_t euid,
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struct user_namespace *user_ns, struct pid *pid);
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int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
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struct pid *pid);
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int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
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struct pid *pid);
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int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
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struct user_namespace *user_ns, struct pid *pid,
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u32 seq);
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int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
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int ecryptfs_send_message(char *data, int data_len,
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struct ecryptfs_msg_ctx **msg_ctx);
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int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
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struct ecryptfs_message **emsg);
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int ecryptfs_init_messaging(unsigned int transport);
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void ecryptfs_release_messaging(unsigned int transport);
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int ecryptfs_init_messaging(void);
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void ecryptfs_release_messaging(void);
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int ecryptfs_send_netlink(char *data, int data_len,
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struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
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u16 msg_flags, struct pid *daemon_pid);
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int ecryptfs_init_netlink(void);
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void ecryptfs_release_netlink(void);
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int ecryptfs_send_connector(char *data, int data_len,
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struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
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u16 msg_flags, struct pid *daemon_pid);
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int ecryptfs_init_connector(void);
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void ecryptfs_release_connector(void);
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void
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ecryptfs_write_header_metadata(char *virt,
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struct ecryptfs_crypt_stat *crypt_stat,
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@ -234,8 +234,8 @@ parse_tag_65_packet(struct ecryptfs_session_key *session_key, u8 *cipher_code,
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}
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i += data_len;
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if (message_len < (i + m_size)) {
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ecryptfs_printk(KERN_ERR, "The received netlink message is "
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"shorter than expected\n");
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ecryptfs_printk(KERN_ERR, "The message received from ecryptfsd "
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"is shorter than expected\n");
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rc = -EIO;
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goto out;
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}
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@ -438,8 +438,8 @@ decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
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struct ecryptfs_msg_ctx *msg_ctx;
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struct ecryptfs_message *msg = NULL;
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char *auth_tok_sig;
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char *netlink_message;
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size_t netlink_message_length;
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char *payload;
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size_t payload_len;
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int rc;
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rc = ecryptfs_get_auth_tok_sig(&auth_tok_sig, auth_tok);
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@ -449,15 +449,15 @@ decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
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goto out;
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}
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rc = write_tag_64_packet(auth_tok_sig, &(auth_tok->session_key),
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&netlink_message, &netlink_message_length);
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&payload, &payload_len);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Failed to write tag 64 packet\n");
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goto out;
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}
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rc = ecryptfs_send_message(ecryptfs_transport, netlink_message,
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netlink_message_length, &msg_ctx);
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rc = ecryptfs_send_message(payload, payload_len, &msg_ctx);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error sending netlink message\n");
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ecryptfs_printk(KERN_ERR, "Error sending message to "
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"ecryptfsd\n");
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goto out;
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}
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rc = ecryptfs_wait_for_response(msg_ctx, &msg);
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@ -1333,23 +1333,22 @@ pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok,
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struct ecryptfs_key_record *key_rec)
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{
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struct ecryptfs_msg_ctx *msg_ctx = NULL;
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char *netlink_payload;
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size_t netlink_payload_length;
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char *payload = NULL;
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size_t payload_len;
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struct ecryptfs_message *msg;
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int rc;
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rc = write_tag_66_packet(auth_tok->token.private_key.signature,
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ecryptfs_code_for_cipher_string(crypt_stat),
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crypt_stat, &netlink_payload,
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&netlink_payload_length);
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crypt_stat, &payload, &payload_len);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error generating tag 66 packet\n");
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goto out;
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}
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rc = ecryptfs_send_message(ecryptfs_transport, netlink_payload,
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netlink_payload_length, &msg_ctx);
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rc = ecryptfs_send_message(payload, payload_len, &msg_ctx);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error sending netlink message\n");
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ecryptfs_printk(KERN_ERR, "Error sending message to "
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"ecryptfsd\n");
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goto out;
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}
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rc = ecryptfs_wait_for_response(msg_ctx, &msg);
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@ -1364,8 +1363,7 @@ pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok,
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ecryptfs_printk(KERN_ERR, "Error parsing tag 67 packet\n");
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kfree(msg);
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out:
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if (netlink_payload)
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kfree(netlink_payload);
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kfree(payload);
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return rc;
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}
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/**
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@ -30,7 +30,6 @@
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#include <linux/namei.h>
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#include <linux/skbuff.h>
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#include <linux/crypto.h>
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#include <linux/netlink.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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#include <linux/key.h>
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@ -49,8 +48,7 @@ MODULE_PARM_DESC(ecryptfs_verbosity,
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"0, which is Quiet)");
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/**
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* Module parameter that defines the number of netlink message buffer
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* elements
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* Module parameter that defines the number of message buffer elements
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*/
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unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
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@ -60,9 +58,9 @@ MODULE_PARM_DESC(ecryptfs_message_buf_len,
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/**
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* Module parameter that defines the maximum guaranteed amount of time to wait
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* for a response through netlink. The actual sleep time will be, more than
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* for a response from ecryptfsd. The actual sleep time will be, more than
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* likely, a small amount greater than this specified value, but only less if
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* the netlink message successfully arrives.
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* the message successfully arrives.
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*/
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signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
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@ -83,8 +81,6 @@ module_param(ecryptfs_number_of_users, uint, 0);
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MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
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"concurrent users of eCryptfs");
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unsigned int ecryptfs_transport = ECRYPTFS_DEFAULT_TRANSPORT;
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void __ecryptfs_printk(const char *fmt, ...)
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{
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va_list args;
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@ -779,10 +775,11 @@ static int __init ecryptfs_init(void)
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"rc = [%d]\n", __func__, rc);
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goto out_do_sysfs_unregistration;
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}
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rc = ecryptfs_init_messaging(ecryptfs_transport);
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rc = ecryptfs_init_messaging();
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if (rc) {
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printk(KERN_ERR "Failure occured while attempting to "
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"initialize the eCryptfs netlink socket\n");
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"initialize the communications channel to "
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"ecryptfsd\n");
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goto out_destroy_kthread;
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}
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rc = ecryptfs_init_crypto();
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@ -797,7 +794,7 @@ static int __init ecryptfs_init(void)
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goto out;
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out_release_messaging:
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ecryptfs_release_messaging(ecryptfs_transport);
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ecryptfs_release_messaging();
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out_destroy_kthread:
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ecryptfs_destroy_kthread();
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out_do_sysfs_unregistration:
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@ -818,7 +815,7 @@ static void __exit ecryptfs_exit(void)
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if (rc)
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printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
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"rc = [%d]\n", rc);
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ecryptfs_release_messaging(ecryptfs_transport);
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ecryptfs_release_messaging();
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ecryptfs_destroy_kthread();
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do_sysfs_unregistration();
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unregister_filesystem(&ecryptfs_fs_type);
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@ -134,12 +134,11 @@ out:
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}
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static int
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ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
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u8 msg_type, struct ecryptfs_msg_ctx **msg_ctx);
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ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
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struct ecryptfs_msg_ctx **msg_ctx);
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/**
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* ecryptfs_send_raw_message
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* @transport: Transport type
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* @msg_type: Message type
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* @daemon: Daemon struct for recipient of message
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*
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@ -150,38 +149,25 @@ ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
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*
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* Returns zero on success; non-zero otherwise
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*/
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static int ecryptfs_send_raw_message(unsigned int transport, u8 msg_type,
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static int ecryptfs_send_raw_message(u8 msg_type,
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struct ecryptfs_daemon *daemon)
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{
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struct ecryptfs_msg_ctx *msg_ctx;
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int rc;
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switch(transport) {
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case ECRYPTFS_TRANSPORT_NETLINK:
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rc = ecryptfs_send_netlink(NULL, 0, NULL, msg_type, 0,
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daemon->pid);
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break;
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case ECRYPTFS_TRANSPORT_MISCDEV:
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rc = ecryptfs_send_message_locked(transport, NULL, 0, msg_type,
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&msg_ctx);
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rc = ecryptfs_send_message_locked(NULL, 0, msg_type, &msg_ctx);
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if (rc) {
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printk(KERN_ERR "%s: Error whilst attempting to send "
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"message via procfs; rc = [%d]\n", __func__, rc);
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"message to ecryptfsd; rc = [%d]\n", __func__, rc);
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goto out;
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}
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/* Raw messages are logically context-free (e.g., no
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* reply is expected), so we set the state of the
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* ecryptfs_msg_ctx object to indicate that it should
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* be freed as soon as the transport sends out the message. */
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* be freed as soon as the message is sent. */
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mutex_lock(&msg_ctx->mux);
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msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_NO_REPLY;
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mutex_unlock(&msg_ctx->mux);
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break;
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case ECRYPTFS_TRANSPORT_CONNECTOR:
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case ECRYPTFS_TRANSPORT_RELAYFS:
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default:
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rc = -ENOSYS;
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}
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out:
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return rc;
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}
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@ -227,7 +213,6 @@ out:
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/**
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* ecryptfs_process_helo
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* @transport: The underlying transport (netlink, etc.)
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* @euid: The user ID owner of the message
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* @user_ns: The namespace in which @euid applies
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* @pid: The process ID for the userspace program that sent the
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@ -239,8 +224,8 @@ out:
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* Returns zero after adding a new daemon to the hash list;
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* non-zero otherwise.
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*/
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int ecryptfs_process_helo(unsigned int transport, uid_t euid,
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struct user_namespace *user_ns, struct pid *pid)
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int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
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struct pid *pid)
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{
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struct ecryptfs_daemon *new_daemon;
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struct ecryptfs_daemon *old_daemon;
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@ -252,8 +237,7 @@ int ecryptfs_process_helo(unsigned int transport, uid_t euid,
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printk(KERN_WARNING "Received request from user [%d] "
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"to register daemon [0x%p]; unregistering daemon "
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"[0x%p]\n", euid, pid, old_daemon->pid);
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rc = ecryptfs_send_raw_message(transport, ECRYPTFS_MSG_QUIT,
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old_daemon);
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rc = ecryptfs_send_raw_message(ECRYPTFS_MSG_QUIT, old_daemon);
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if (rc)
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printk(KERN_WARNING "Failed to send QUIT "
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"message to daemon [0x%p]; rc = [%d]\n",
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@ -467,8 +451,6 @@ out:
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/**
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* ecryptfs_send_message_locked
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* @transport: The transport over which to send the message (i.e.,
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* netlink)
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* @data: The data to send
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* @data_len: The length of data
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* @msg_ctx: The message context allocated for the send
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@ -478,8 +460,8 @@ out:
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* Returns zero on success; non-zero otherwise
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*/
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static int
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ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
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u8 msg_type, struct ecryptfs_msg_ctx **msg_ctx)
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ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
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struct ecryptfs_msg_ctx **msg_ctx)
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{
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struct ecryptfs_daemon *daemon;
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int rc;
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@ -503,20 +485,8 @@ ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
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ecryptfs_msg_ctx_free_to_alloc(*msg_ctx);
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mutex_unlock(&(*msg_ctx)->mux);
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mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
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switch (transport) {
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case ECRYPTFS_TRANSPORT_NETLINK:
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rc = ecryptfs_send_netlink(data, data_len, *msg_ctx, msg_type,
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0, daemon->pid);
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break;
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case ECRYPTFS_TRANSPORT_MISCDEV:
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rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type,
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0, daemon);
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break;
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case ECRYPTFS_TRANSPORT_CONNECTOR:
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case ECRYPTFS_TRANSPORT_RELAYFS:
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default:
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rc = -ENOSYS;
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}
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rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type, 0,
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daemon);
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if (rc)
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printk(KERN_ERR "%s: Error attempting to send message to "
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"userspace daemon; rc = [%d]\n", __func__, rc);
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@ -526,8 +496,6 @@ out:
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/**
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* ecryptfs_send_message
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* @transport: The transport over which to send the message (i.e.,
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* netlink)
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* @data: The data to send
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* @data_len: The length of data
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* @msg_ctx: The message context allocated for the send
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@ -536,14 +504,14 @@ out:
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*
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* Returns zero on success; non-zero otherwise
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*/
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int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
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int ecryptfs_send_message(char *data, int data_len,
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struct ecryptfs_msg_ctx **msg_ctx)
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{
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int rc;
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mutex_lock(&ecryptfs_daemon_hash_mux);
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rc = ecryptfs_send_message_locked(transport, data, data_len,
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ECRYPTFS_MSG_REQUEST, msg_ctx);
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rc = ecryptfs_send_message_locked(data, data_len, ECRYPTFS_MSG_REQUEST,
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msg_ctx);
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mutex_unlock(&ecryptfs_daemon_hash_mux);
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return rc;
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}
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@ -586,7 +554,7 @@ sleep:
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return rc;
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}
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int ecryptfs_init_messaging(unsigned int transport)
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int ecryptfs_init_messaging(void)
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{
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int i;
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int rc = 0;
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|
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@ -639,27 +607,14 @@ int ecryptfs_init_messaging(unsigned int transport)
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mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
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}
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mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
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||||
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;
|
||||
}
|
||||
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;
|
||||
|
|
@ -698,17 +653,6 @@ 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;
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,249 +0,0 @@
|
|||
/**
|
||||
* eCryptfs: Linux filesystem encryption layer
|
||||
*
|
||||
* Copyright (C) 2004-2006 International Business Machines Corp.
|
||||
* Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
|
||||
* Tyler Hicks <tyhicks@ou.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;
|
||||
}
|
||||
Loading…
Reference in a new issue