-/*
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
* lttng-abi.c
*
* LTTng ABI
*
* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- *
* Mimic system calls for:
* - session creation, returns a file descriptor or failure.
* - channel creation, returns a file descriptor or failure.
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/err.h>
-#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
-#include <wrapper/ringbuffer/vfs.h>
-#include <wrapper/ringbuffer/backend.h>
-#include <wrapper/ringbuffer/frontend.h>
+#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
+#include <ringbuffer/vfs.h>
+#include <ringbuffer/backend.h>
+#include <ringbuffer/frontend.h>
#include <wrapper/poll.h>
#include <wrapper/file.h>
#include <wrapper/kref.h>
-#include <lttng-abi.h>
-#include <lttng-abi-old.h>
-#include <lttng-events.h>
-#include <lttng-tracer.h>
-#include <lib/ringbuffer/frontend_types.h>
+#include <lttng/string-utils.h>
+#include <lttng/abi.h>
+#include <lttng/abi-old.h>
+#include <lttng/events.h>
+#include <lttng/tracer.h>
+#include <lttng/tp-mempool.h>
+#include <ringbuffer/frontend_types.h>
/*
* This is LTTng's own personal way to create a system call as an external
*/
static struct proc_dir_entry *lttng_proc_dentry;
-static const struct file_operations lttng_fops;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops lttng_proc_ops;
+#else
+static const struct file_operations lttng_proc_ops;
+#endif
+
static const struct file_operations lttng_session_fops;
static const struct file_operations lttng_channel_fops;
static const struct file_operations lttng_metadata_fops;
return lttng_add_preemptible_to_ctx(ctx);
case LTTNG_KERNEL_CONTEXT_MIGRATABLE:
return lttng_add_migratable_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL:
+ case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER:
+ return lttng_add_callstack_to_ctx(ctx, context_param->ctx);
+ case LTTNG_KERNEL_CONTEXT_CGROUP_NS:
+ return lttng_add_cgroup_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_IPC_NS:
+ return lttng_add_ipc_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_MNT_NS:
+ return lttng_add_mnt_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_NET_NS:
+ return lttng_add_net_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_PID_NS:
+ return lttng_add_pid_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_USER_NS:
+ return lttng_add_user_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_UTS_NS:
+ return lttng_add_uts_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_UID:
+ return lttng_add_uid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_EUID:
+ return lttng_add_euid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_SUID:
+ return lttng_add_suid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_GID:
+ return lttng_add_gid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_EGID:
+ return lttng_add_egid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_SGID:
+ return lttng_add_sgid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VUID:
+ return lttng_add_vuid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VEUID:
+ return lttng_add_veuid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VSUID:
+ return lttng_add_vsuid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VGID:
+ return lttng_add_vgid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VEGID:
+ return lttng_add_vegid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VSGID:
+ return lttng_add_vsgid_to_ctx(ctx);
default:
return -EINVAL;
}
}
}
-static const struct file_operations lttng_fops = {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops lttng_proc_ops = {
+ .proc_ioctl = lttng_ioctl,
+#ifdef CONFIG_COMPAT
+ .proc_compat_ioctl = lttng_ioctl,
+#endif /* CONFIG_COMPAT */
+};
+#else
+static const struct file_operations lttng_proc_ops = {
.owner = THIS_MODULE,
.unlocked_ioctl = lttng_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = lttng_ioctl,
-#endif
+#endif /* CONFIG_COMPAT */
};
+#endif
static
int lttng_abi_create_channel(struct file *session_file,
fops = <tng_metadata_fops;
break;
}
-
+
chan_file = anon_inode_getfile("[lttng_channel]",
fops,
NULL, O_RDWR);
transport_name = "<unknown>";
break;
}
- if (atomic_long_add_unless(&session_file->f_count,
- 1, INT_MAX) == INT_MAX) {
+ if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
goto refcount_error;
}
/*
return ret;
}
+static
+int lttng_abi_session_set_name(struct lttng_session *session,
+ struct lttng_kernel_session_name *name)
+{
+ size_t len;
+
+ len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN);
+
+ if (len == LTTNG_KERNEL_SESSION_NAME_LEN) {
+ /* Name is too long/malformed */
+ return -EINVAL;
+ }
+
+ strcpy(session->name, name->name);
+ return 0;
+}
+
+static
+int lttng_abi_session_set_creation_time(struct lttng_session *session,
+ struct lttng_kernel_session_creation_time *time)
+{
+ size_t len;
+
+ len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN);
+
+ if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) {
+ /* Time is too long/malformed */
+ return -EINVAL;
+ }
+
+ strcpy(session->creation_time, time->iso8601);
+ return 0;
+}
+
+static
+enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker)
+{
+ switch (tracker->type) {
+ case LTTNG_KERNEL_TRACKER_PID:
+ return TRACKER_PID;
+ case LTTNG_KERNEL_TRACKER_VPID:
+ return TRACKER_VPID;
+ case LTTNG_KERNEL_TRACKER_UID:
+ return TRACKER_UID;
+ case LTTNG_KERNEL_TRACKER_VUID:
+ return TRACKER_VUID;
+ case LTTNG_KERNEL_TRACKER_GID:
+ return TRACKER_GID;
+ case LTTNG_KERNEL_TRACKER_VGID:
+ return TRACKER_VGID;
+ default:
+ return TRACKER_UNKNOWN;
+ }
+}
+
/**
* lttng_session_ioctl - lttng session fd ioctl
*
* LTTNG_KERNEL_METADATA
* Returns a LTTng metadata file descriptor
* LTTNG_KERNEL_SESSION_TRACK_PID
- * Add PID to session tracker
+ * Add PID to session PID tracker
* LTTNG_KERNEL_SESSION_UNTRACK_PID
- * Remove PID from session tracker
+ * Remove PID from session PID tracker
+ * LTTNG_KERNEL_SESSION_TRACK_ID
+ * Add ID to tracker
+ * LTTNG_KERNEL_SESSION_UNTRACK_ID
+ * Remove ID from tracker
*
* The returned channel will be deleted when its file descriptor is closed.
*/
long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct lttng_session *session = file->private_data;
+ struct lttng_kernel_channel chan_param;
+ struct lttng_kernel_old_channel old_chan_param;
switch (cmd) {
case LTTNG_KERNEL_OLD_CHANNEL:
{
- struct lttng_kernel_channel chan_param;
- struct lttng_kernel_old_channel old_chan_param;
-
if (copy_from_user(&old_chan_param,
(struct lttng_kernel_old_channel __user *) arg,
sizeof(struct lttng_kernel_old_channel)))
}
case LTTNG_KERNEL_CHANNEL:
{
- struct lttng_kernel_channel chan_param;
-
if (copy_from_user(&chan_param,
(struct lttng_kernel_channel __user *) arg,
sizeof(struct lttng_kernel_channel)))
return lttng_session_disable(session);
case LTTNG_KERNEL_OLD_METADATA:
{
- struct lttng_kernel_channel chan_param;
- struct lttng_kernel_old_channel old_chan_param;
-
if (copy_from_user(&old_chan_param,
(struct lttng_kernel_old_channel __user *) arg,
sizeof(struct lttng_kernel_old_channel)))
}
case LTTNG_KERNEL_METADATA:
{
- struct lttng_kernel_channel chan_param;
-
if (copy_from_user(&chan_param,
(struct lttng_kernel_channel __user *) arg,
sizeof(struct lttng_kernel_channel)))
METADATA_CHANNEL);
}
case LTTNG_KERNEL_SESSION_TRACK_PID:
- return lttng_session_track_pid(session, (int) arg);
+ return lttng_session_track_id(session, TRACKER_PID, (int) arg);
case LTTNG_KERNEL_SESSION_UNTRACK_PID:
- return lttng_session_untrack_pid(session, (int) arg);
+ return lttng_session_untrack_id(session, TRACKER_PID, (int) arg);
+ case LTTNG_KERNEL_SESSION_TRACK_ID:
+ {
+ struct lttng_kernel_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_track_id(session, tracker_type, tracker.id);
+ }
+ case LTTNG_KERNEL_SESSION_UNTRACK_ID:
+ {
+ struct lttng_kernel_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_untrack_id(session, tracker_type,
+ tracker.id);
+ }
case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS:
- return lttng_session_list_tracker_pids(session);
+ return lttng_session_list_tracker_ids(session, TRACKER_PID);
+ case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS:
+ {
+ struct lttng_kernel_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_list_tracker_ids(session, tracker_type);
+ }
case LTTNG_KERNEL_SESSION_METADATA_REGEN:
return lttng_session_metadata_regenerate(session);
+ case LTTNG_KERNEL_SESSION_STATEDUMP:
+ return lttng_session_statedump(session);
+ case LTTNG_KERNEL_SESSION_SET_NAME:
+ {
+ struct lttng_kernel_session_name name;
+
+ if (copy_from_user(&name,
+ (struct lttng_kernel_session_name __user *) arg,
+ sizeof(struct lttng_kernel_session_name)))
+ return -EFAULT;
+ return lttng_abi_session_set_name(session, &name);
+ }
+ case LTTNG_KERNEL_SESSION_SET_CREATION_TIME:
+ {
+ struct lttng_kernel_session_creation_time time;
+
+ if (copy_from_user(&time,
+ (struct lttng_kernel_session_creation_time __user *) arg,
+ sizeof(struct lttng_kernel_session_creation_time)))
+ return -EFAULT;
+ return lttng_abi_session_set_creation_time(session, &time);
+ }
default:
return -ENOIOCTLCMD;
}
stream->metadata_out = stream->metadata_in;
}
+/*
+ * Reset the counter of how much metadata has been consumed to 0. That way,
+ * the consumer receives the content of the metadata cache unchanged. This is
+ * different from the metadata_regenerate where the offset from epoch is
+ * resampled, here we want the exact same content as the last time the metadata
+ * was generated. This command is only possible if all the metadata written
+ * in the cache has been output to the metadata stream to avoid corrupting the
+ * metadata file.
+ *
+ * Return 0 on success, a negative value on error.
+ */
+static
+int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream)
+{
+ int ret;
+ struct lttng_metadata_cache *cache = stream->metadata_cache;
+
+ mutex_lock(&cache->lock);
+ if (stream->metadata_out != cache->metadata_written) {
+ ret = -EBUSY;
+ goto end;
+ }
+ stream->metadata_out = 0;
+ stream->metadata_in = 0;
+ wake_up_interruptible(&stream->read_wait);
+ ret = 0;
+
+end:
+ mutex_unlock(&cache->lock);
+ return ret;
+}
+
static
long lttng_metadata_ring_buffer_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
*/
return -ENOSYS;
}
+ case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
case RING_BUFFER_FLUSH:
{
struct lttng_metadata_stream *stream = filp->private_data;
return put_u64(stream->version, arg);
}
+ case RING_BUFFER_METADATA_CACHE_DUMP:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return lttng_metadata_cache_dump(stream);
+ }
default:
break;
}
*/
return -ENOSYS;
}
+ case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
+ case RING_BUFFER_FLUSH:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+ struct channel *chan = buf->backend.chan;
+
+ /*
+ * Before doing the actual ring buffer flush, write up to one
+ * packet of metadata in the ring buffer.
+ */
+ ret = lttng_metadata_output_channel(stream, chan);
+ if (ret < 0)
+ goto err;
+ break;
+ }
+ case RING_BUFFER_GET_METADATA_VERSION:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return put_u64(stream->version, arg);
+ }
+ case RING_BUFFER_METADATA_CACHE_DUMP:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return lttng_metadata_cache_dump(stream);
+ }
default:
break;
}
cmd, arg);
break;
}
- case RING_BUFFER_GET_METADATA_VERSION:
- {
- struct lttng_metadata_stream *stream = filp->private_data;
-
- return put_u64(stream->version, arg);
- }
default:
break;
}
goto notransport;
}
- if (!lttng_kref_get(&session->metadata_cache->refcount))
+ if (!lttng_kref_get(&session->metadata_cache->refcount)) {
+ ret = -EOVERFLOW;
goto kref_error;
+ }
+
ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
<tng_metadata_ring_buffer_file_operations);
if (ret < 0)
event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
break;
case LTTNG_KERNEL_FUNCTION:
- event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ WARN_ON_ONCE(1);
+ /* Not implemented. */
break;
default:
break;
goto file_error;
}
/* The event holds a reference on the channel */
- if (atomic_long_add_unless(&channel_file->f_count,
- 1, INT_MAX) == INT_MAX) {
+ if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) {
ret = -EOVERFLOW;
goto refcount_error;
}
|| event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
struct lttng_enabler *enabler;
- if (event_param->name[strlen(event_param->name) - 1] == '*') {
- enabler = lttng_enabler_create(LTTNG_ENABLER_WILDCARD,
+ if (strutils_is_star_glob_pattern(event_param->name)) {
+ /*
+ * If the event name is a star globbing pattern,
+ * we create the special star globbing enabler.
+ */
+ enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB,
event_param, channel);
} else {
enabler = lttng_enabler_create(LTTNG_ENABLER_NAME,
sizeof(uevent_param->u.kretprobe.symbol_name));
break;
case LTTNG_KERNEL_FUNCTION:
- memcpy(uevent_param->u.ftrace.symbol_name,
- old_uevent_param->u.ftrace.symbol_name,
- sizeof(uevent_param->u.ftrace.symbol_name));
+ WARN_ON_ONCE(1);
+ /* Not implemented. */
break;
default:
break;
default:
return -ENOIOCTLCMD;
}
-
}
/**
return lttng_enabler_attach_bytecode(enabler,
(struct lttng_kernel_filter_bytecode __user *) arg);
}
-
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_ADD_CALLSITE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ return lttng_event_add_callsite(event,
+ (struct lttng_kernel_event_callsite __user *) arg);
+ case LTTNG_TYPE_ENABLER:
+ return -EINVAL;
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
}
default:
return -ENOIOCTLCMD;
{
int ret = 0;
- wrapper_vmalloc_sync_all();
+ wrapper_vmalloc_sync_mappings();
lttng_clock_ref();
+
+ ret = lttng_tp_mempool_init();
+ if (ret) {
+ goto error;
+ }
+
lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL,
- <tng_fops, NULL);
-
+ <tng_proc_ops, NULL);
+
if (!lttng_proc_dentry) {
printk(KERN_ERR "Error creating LTTng control file\n");
ret = -ENOMEM;
return 0;
error:
+ lttng_tp_mempool_destroy();
lttng_clock_unref();
return ret;
}
/* No __exit annotation because used by init error path too. */
void lttng_abi_exit(void)
{
+ lttng_tp_mempool_destroy();
lttng_clock_unref();
if (lttng_proc_dentry)
remove_proc_entry("lttng", NULL);
projects / lttng-modules.git / blobdiff