[lttng-modules.git] / lttng-filter.c

/*
 * lttng-filter.c
 *
 * LTTng modules filter code.
 *
 * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/list.h>
#include <linux/slab.h>

#include <lttng-filter.h>

static const char *opnames[] = {
	[ FILTER_OP_UNKNOWN ] = "UNKNOWN",

	[ FILTER_OP_RETURN ] = "RETURN",

	/* binary */
	[ FILTER_OP_MUL ] = "MUL",
	[ FILTER_OP_DIV ] = "DIV",
	[ FILTER_OP_MOD ] = "MOD",
	[ FILTER_OP_PLUS ] = "PLUS",
	[ FILTER_OP_MINUS ] = "MINUS",
	[ FILTER_OP_BIT_RSHIFT ] = "BIT_RSHIFT",
	[ FILTER_OP_BIT_LSHIFT ] = "BIT_LSHIFT",
	[ FILTER_OP_BIT_AND ] = "BIT_AND",
	[ FILTER_OP_BIT_OR ] = "BIT_OR",
	[ FILTER_OP_BIT_XOR ] = "BIT_XOR",

	/* binary comparators */
	[ FILTER_OP_EQ ] = "EQ",
	[ FILTER_OP_NE ] = "NE",
	[ FILTER_OP_GT ] = "GT",
	[ FILTER_OP_LT ] = "LT",
	[ FILTER_OP_GE ] = "GE",
	[ FILTER_OP_LE ] = "LE",

	/* string binary comparators */
	[ FILTER_OP_EQ_STRING ] = "EQ_STRING",
	[ FILTER_OP_NE_STRING ] = "NE_STRING",
	[ FILTER_OP_GT_STRING ] = "GT_STRING",
	[ FILTER_OP_LT_STRING ] = "LT_STRING",
	[ FILTER_OP_GE_STRING ] = "GE_STRING",
	[ FILTER_OP_LE_STRING ] = "LE_STRING",

	/* s64 binary comparators */
	[ FILTER_OP_EQ_S64 ] = "EQ_S64",
	[ FILTER_OP_NE_S64 ] = "NE_S64",
	[ FILTER_OP_GT_S64 ] = "GT_S64",
	[ FILTER_OP_LT_S64 ] = "LT_S64",
	[ FILTER_OP_GE_S64 ] = "GE_S64",
	[ FILTER_OP_LE_S64 ] = "LE_S64",

	/* double binary comparators */
	[ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE",
	[ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE",
	[ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE",
	[ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE",
	[ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE",
	[ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE",

	/* Mixed S64-double binary comparators */
	[ FILTER_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64",
	[ FILTER_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64",
	[ FILTER_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64",
	[ FILTER_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64",
	[ FILTER_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64",
	[ FILTER_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64",

	[ FILTER_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE",
	[ FILTER_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE",
	[ FILTER_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE",
	[ FILTER_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE",
	[ FILTER_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE",
	[ FILTER_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE",

	/* unary */
	[ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
	[ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
	[ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
	[ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64",
	[ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64",
	[ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64",
	[ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE",
	[ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE",
	[ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE",

	/* logical */
	[ FILTER_OP_AND ] = "AND",
	[ FILTER_OP_OR ] = "OR",

	/* load field ref */
	[ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
	[ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING",
	[ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE",
	[ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64",
	[ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE",

	/* load from immediate operand */
	[ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
	[ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
	[ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",

	/* cast */
	[ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64",
	[ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64",
	[ FILTER_OP_CAST_NOP ] = "CAST_NOP",

	/* get context ref */
	[ FILTER_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF",
	[ FILTER_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING",
	[ FILTER_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64",
	[ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE",

	/* load userspace field ref */
	[ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING",
	[ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = "LOAD_FIELD_REF_USER_SEQUENCE",

	/*
	 * load immediate star globbing pattern (literal string)
	 * from immediate.
	 */
	[ FILTER_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING",

	/* globbing pattern binary operator: apply to */
	[ FILTER_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING",
	[ FILTER_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING",

	/*
	 * Instructions for recursive traversal through composed types.
	 */
	[ FILTER_OP_GET_CONTEXT_ROOT ] = "GET_CONTEXT_ROOT",
	[ FILTER_OP_GET_APP_CONTEXT_ROOT ] = "GET_APP_CONTEXT_ROOT",
	[ FILTER_OP_GET_PAYLOAD_ROOT ] = "GET_PAYLOAD_ROOT",

	[ FILTER_OP_GET_SYMBOL ] = "GET_SYMBOL",
	[ FILTER_OP_GET_SYMBOL_FIELD ] = "GET_SYMBOL_FIELD",
	[ FILTER_OP_GET_INDEX_U16 ] = "GET_INDEX_U16",
	[ FILTER_OP_GET_INDEX_U64 ] = "GET_INDEX_U64",

	[ FILTER_OP_LOAD_FIELD ] = "LOAD_FIELD",
	[ FILTER_OP_LOAD_FIELD_S8 ] = "LOAD_FIELD_S8",
	[ FILTER_OP_LOAD_FIELD_S16 ] = "LOAD_FIELD_S16",
	[ FILTER_OP_LOAD_FIELD_S32 ] = "LOAD_FIELD_S32",
	[ FILTER_OP_LOAD_FIELD_S64 ] = "LOAD_FIELD_S64",
	[ FILTER_OP_LOAD_FIELD_U8 ] = "LOAD_FIELD_U8",
	[ FILTER_OP_LOAD_FIELD_U16 ] = "LOAD_FIELD_U16",
	[ FILTER_OP_LOAD_FIELD_U32 ] = "LOAD_FIELD_U32",
	[ FILTER_OP_LOAD_FIELD_U64 ] = "LOAD_FIELD_U64",
	[ FILTER_OP_LOAD_FIELD_STRING ] = "LOAD_FIELD_STRING",
	[ FILTER_OP_LOAD_FIELD_SEQUENCE ] = "LOAD_FIELD_SEQUENCE",
	[ FILTER_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE",

	[ FILTER_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT",

	[ FILTER_OP_RETURN_S64 ] = "RETURN_S64",
};

const char *lttng_filter_print_op(enum filter_op op)
{
	if (op >= NR_FILTER_OPS)
		return "UNKNOWN";
	else
		return opnames[op];
}

static
int apply_field_reloc(struct lttng_event *event,
		struct bytecode_runtime *runtime,
		uint32_t runtime_len,
		uint32_t reloc_offset,
		const char *field_name,
		enum filter_op filter_op)
{
	const struct lttng_event_desc *desc;
	const struct lttng_event_field *fields, *field = NULL;
	unsigned int nr_fields, i;
	struct load_op *op;
	uint32_t field_offset = 0;

	dbg_printk("Apply field reloc: %u %s\n", reloc_offset, field_name);

	/* Lookup event by name */
	desc = event->desc;
	if (!desc)
		return -EINVAL;
	fields = desc->fields;
	if (!fields)
		return -EINVAL;
	nr_fields = desc->nr_fields;
	for (i = 0; i < nr_fields; i++) {
		if (!strcmp(fields[i].name, field_name)) {
			field = &fields[i];
			break;
		}
		/* compute field offset */
		switch (fields[i].type.atype) {
		case atype_integer:
		case atype_enum:
			field_offset += sizeof(int64_t);
			break;
		case atype_array:
		case atype_sequence:
		case atype_array_bitfield:
		case atype_sequence_bitfield:
			field_offset += sizeof(unsigned long);
			field_offset += sizeof(void *);
			break;
		case atype_string:
			field_offset += sizeof(void *);
			break;
		case atype_struct:		/* Unsupported. */
		case atype_array_compound:	/* Unsupported. */
		case atype_sequence_compound:	/* Unsupported. */
		case atype_variant:		/* Unsupported. */
		default:
			return -EINVAL;
		}
	}
	if (!field)
		return -EINVAL;

	/* Check if field offset is too large for 16-bit offset */
	if (field_offset > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1)
		return -EINVAL;

	/* set type */
	op = (struct load_op *) &runtime->code[reloc_offset];

	switch (filter_op) {
	case FILTER_OP_LOAD_FIELD_REF:
	{
		struct field_ref *field_ref;

		field_ref = (struct field_ref *) op->data;
		switch (field->type.atype) {
		case atype_integer:
		case atype_enum:
			op->op = FILTER_OP_LOAD_FIELD_REF_S64;
			break;
		case atype_array:
		case atype_sequence:
			if (field->user)
				op->op = FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE;
			else
				op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
			break;
		case atype_string:
			if (field->user)
				op->op = FILTER_OP_LOAD_FIELD_REF_USER_STRING;
			else
				op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
			break;
		case atype_struct:		/* Unsupported. */
		case atype_array_compound:	/* Unsupported. */
		case atype_sequence_compound:	/* Unsupported. */
		case atype_variant:		/* Unsupported. */
		case atype_array_bitfield:	/* Unsupported. */
		case atype_sequence_bitfield:	/* Unsupported. */
		default:
			return -EINVAL;
		}
		/* set offset */
		field_ref->offset = (uint16_t) field_offset;
		break;
	}
	default:
		return -EINVAL;
	}
	return 0;
}

static
int apply_context_reloc(struct lttng_event *event,
		struct bytecode_runtime *runtime,
		uint32_t runtime_len,
		uint32_t reloc_offset,
		const char *context_name,
		enum filter_op filter_op)
{
	struct load_op *op;
	struct lttng_ctx_field *ctx_field;
	int idx;

	dbg_printk("Apply context reloc: %u %s\n", reloc_offset, context_name);

	/* Get context index */
	idx = lttng_get_context_index(lttng_static_ctx, context_name);
	if (idx < 0)
		return -ENOENT;

	/* Check if idx is too large for 16-bit offset */
	if (idx > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1)
		return -EINVAL;

	/* Get context return type */
	ctx_field = &lttng_static_ctx->fields[idx];
	op = (struct load_op *) &runtime->code[reloc_offset];

	switch (filter_op) {
	case FILTER_OP_GET_CONTEXT_REF:
	{
		struct field_ref *field_ref;

		field_ref = (struct field_ref *) op->data;
		switch (ctx_field->event_field.type.atype) {
		case atype_integer:
		case atype_enum:
			op->op = FILTER_OP_GET_CONTEXT_REF_S64;
			break;
			/* Sequence and array supported as string */
		case atype_string:
		case atype_array:
		case atype_sequence:
			BUG_ON(ctx_field->event_field.user);
			op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
			break;
		case atype_struct:	/* Unsupported. */
		case atype_array_compound:	/* Unsupported. */
		case atype_sequence_compound:	/* Unsupported. */
		case atype_variant:		/* Unsupported. */
		case atype_array_bitfield:	/* Unsupported. */
		case atype_sequence_bitfield:	/* Unsupported. */
		default:
			return -EINVAL;
		}
		/* set offset to context index within channel contexts */
		field_ref->offset = (uint16_t) idx;
		break;
	}
	default:
		return -EINVAL;
	}
	return 0;
}

static
int apply_reloc(struct lttng_event *event,
		struct bytecode_runtime *runtime,
		uint32_t runtime_len,
		uint32_t reloc_offset,
		const char *name)
{
	struct load_op *op;

	dbg_printk("Apply reloc: %u %s\n", reloc_offset, name);

	/* Ensure that the reloc is within the code */
	if (runtime_len - reloc_offset < sizeof(uint16_t))
		return -EINVAL;

	op = (struct load_op *) &runtime->code[reloc_offset];
	switch (op->op) {
	case FILTER_OP_LOAD_FIELD_REF:
		return apply_field_reloc(event, runtime, runtime_len,
			reloc_offset, name, op->op);
	case FILTER_OP_GET_CONTEXT_REF:
		return apply_context_reloc(event, runtime, runtime_len,
			reloc_offset, name, op->op);
	case FILTER_OP_GET_SYMBOL:
	case FILTER_OP_GET_SYMBOL_FIELD:
		/*
		 * Will be handled by load specialize phase or
		 * dynamically by interpreter.
		 */
		return 0;
	default:
		printk(KERN_WARNING "Unknown reloc op type %u\n", op->op);
		return -EINVAL;
	}
	return 0;
}

static
int bytecode_is_linked(struct lttng_filter_bytecode_node *filter_bytecode,
		struct lttng_event *event)
{
	struct lttng_bytecode_runtime *bc_runtime;

	list_for_each_entry(bc_runtime,
			&event->bytecode_runtime_head, node) {
		if (bc_runtime->bc == filter_bytecode)
			return 1;
	}
	return 0;
}

/*
 * Take a bytecode with reloc table and link it to an event to create a
 * bytecode runtime.
 */
static
int _lttng_filter_event_link_bytecode(struct lttng_event *event,
		struct lttng_filter_bytecode_node *filter_bytecode,
		struct list_head *insert_loc)
{
	int ret, offset, next_offset;
	struct bytecode_runtime *runtime = NULL;
	size_t runtime_alloc_len;

	if (!filter_bytecode)
		return 0;
	/* Bytecode already linked */
	if (bytecode_is_linked(filter_bytecode, event))
		return 0;

	dbg_printk("Linking...\n");

	/* We don't need the reloc table in the runtime */
	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset;
	runtime = kzalloc(runtime_alloc_len, GFP_KERNEL);
	if (!runtime) {
		ret = -ENOMEM;
		goto alloc_error;
	}
	runtime->p.bc = filter_bytecode;
	runtime->p.event = event;
	runtime->len = filter_bytecode->bc.reloc_offset;
	/* copy original bytecode */
	memcpy(runtime->code, filter_bytecode->bc.data, runtime->len);
	/*
	 * apply relocs. Those are a uint16_t (offset in bytecode)
	 * followed by a string (field name).
	 */
	for (offset = filter_bytecode->bc.reloc_offset;
			offset < filter_bytecode->bc.len;
			offset = next_offset) {
		uint16_t reloc_offset =
			*(uint16_t *) &filter_bytecode->bc.data[offset];
		const char *name =
			(const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)];

		ret = apply_reloc(event, runtime, runtime->len, reloc_offset, name);
		if (ret) {
			goto link_error;
		}
		next_offset = offset + sizeof(uint16_t) + strlen(name) + 1;
	}
	/* Validate bytecode */
	ret = lttng_filter_validate_bytecode(runtime);
	if (ret) {
		goto link_error;
	}
	/* Specialize bytecode */
	ret = lttng_filter_specialize_bytecode(event, runtime);
	if (ret) {
		goto link_error;
	}
	runtime->p.filter = lttng_filter_interpret_bytecode;
	runtime->p.link_failed = 0;
	list_add_rcu(&runtime->p.node, insert_loc);
	dbg_printk("Linking successful.\n");
	return 0;

link_error:
	runtime->p.filter = lttng_filter_false;
	runtime->p.link_failed = 1;
	list_add_rcu(&runtime->p.node, insert_loc);
alloc_error:
	dbg_printk("Linking failed.\n");
	return ret;
}

void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime)
{
	struct lttng_filter_bytecode_node *bc = runtime->bc;

	if (!bc->enabler->enabled || runtime->link_failed)
		runtime->filter = lttng_filter_false;
	else
		runtime->filter = lttng_filter_interpret_bytecode;
}

/*
 * Link bytecode for all enablers referenced by an event.
 */
void lttng_enabler_event_link_bytecode(struct lttng_event *event,
		struct lttng_enabler *enabler)
{
	struct lttng_filter_bytecode_node *bc;
	struct lttng_bytecode_runtime *runtime;

	/* Can only be called for events with desc attached */
	WARN_ON_ONCE(!event->desc);

	/* Link each bytecode. */
	list_for_each_entry(bc, &enabler->filter_bytecode_head, node) {
		int found = 0, ret;
		struct list_head *insert_loc;

		list_for_each_entry(runtime,
				&event->bytecode_runtime_head, node) {
			if (runtime->bc == bc) {
				found = 1;
				break;
			}
		}
		/* Skip bytecode already linked */
		if (found)
			continue;

		/*
		 * Insert at specified priority (seqnum) in increasing
		 * order.
		 */
		list_for_each_entry_reverse(runtime,
				&event->bytecode_runtime_head, node) {
			if (runtime->bc->bc.seqnum < bc->bc.seqnum) {
				/* insert here */
				insert_loc = &runtime->node;
				goto add_within;
			}
		}
		/* Add to head to list */
		insert_loc = &event->bytecode_runtime_head;
	add_within:
		dbg_printk("linking bytecode\n");
		ret = _lttng_filter_event_link_bytecode(event, bc,
				insert_loc);
		if (ret) {
			dbg_printk("[lttng filter] warning: cannot link event bytecode\n");
		}
	}
}

/*
 * We own the filter_bytecode if we return success.
 */
int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler,
		struct lttng_filter_bytecode_node *filter_bytecode)
{
	list_add(&filter_bytecode->node, &enabler->filter_bytecode_head);
	return 0;
}

void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler)
{
	struct lttng_filter_bytecode_node *filter_bytecode, *tmp;

	list_for_each_entry_safe(filter_bytecode, tmp,
			&enabler->filter_bytecode_head, node) {
		kfree(filter_bytecode);
	}
}

void lttng_free_event_filter_runtime(struct lttng_event *event)
{
	struct bytecode_runtime *runtime, *tmp;

	list_for_each_entry_safe(runtime, tmp,
			&event->bytecode_runtime_head, p.node) {
		kfree(runtime->data);
		kfree(runtime);
	}
}
Commit	Line	Data
07dfc1d0 MD	1	/*
	2	* lttng-filter.c
	3	*
	4	* LTTng modules filter code.
	5	*
bbf3aef5	6	* Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
07dfc1d0	7	*
bbf3aef5 MD	8	* Permission is hereby granted, free of charge, to any person obtaining a copy
	9	* of this software and associated documentation files (the "Software"), to deal
	10	* in the Software without restriction, including without limitation the rights
	11	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	12	* copies of the Software, and to permit persons to whom the Software is
	13	* furnished to do so, subject to the following conditions:
07dfc1d0	14	*
bbf3aef5 MD	15	* The above copyright notice and this permission notice shall be included in
bbf3aef5 MD	16	* all copies or substantial portions of the Software.
07dfc1d0	17	*
bbf3aef5 MD	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	21	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	22	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	23	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	24	* SOFTWARE.
07dfc1d0 MD	25	*/
	26
	27	#include <linux/list.h>
	28	#include <linux/slab.h>
	29
241ae9a8	30	#include <lttng-filter.h>
07dfc1d0 MD	31
	32	static const char *opnames[] = {
	33	[ FILTER_OP_UNKNOWN ] = "UNKNOWN",
	34
	35	[ FILTER_OP_RETURN ] = "RETURN",
	36
	37	/* binary */
	38	[ FILTER_OP_MUL ] = "MUL",
	39	[ FILTER_OP_DIV ] = "DIV",
	40	[ FILTER_OP_MOD ] = "MOD",
	41	[ FILTER_OP_PLUS ] = "PLUS",
	42	[ FILTER_OP_MINUS ] = "MINUS",
e16c054b MD	43	[ FILTER_OP_BIT_RSHIFT ] = "BIT_RSHIFT",
e16c054b MD	44	[ FILTER_OP_BIT_LSHIFT ] = "BIT_LSHIFT",
3834b99f MD	45	[ FILTER_OP_BIT_AND ] = "BIT_AND",
	46	[ FILTER_OP_BIT_OR ] = "BIT_OR",
	47	[ FILTER_OP_BIT_XOR ] = "BIT_XOR",
07dfc1d0 MD	48
	49	/* binary comparators */
	50	[ FILTER_OP_EQ ] = "EQ",
	51	[ FILTER_OP_NE ] = "NE",
	52	[ FILTER_OP_GT ] = "GT",
	53	[ FILTER_OP_LT ] = "LT",
	54	[ FILTER_OP_GE ] = "GE",
	55	[ FILTER_OP_LE ] = "LE",
	56
	57	/* string binary comparators */
	58	[ FILTER_OP_EQ_STRING ] = "EQ_STRING",
	59	[ FILTER_OP_NE_STRING ] = "NE_STRING",
	60	[ FILTER_OP_GT_STRING ] = "GT_STRING",
	61	[ FILTER_OP_LT_STRING ] = "LT_STRING",
	62	[ FILTER_OP_GE_STRING ] = "GE_STRING",
	63	[ FILTER_OP_LE_STRING ] = "LE_STRING",
	64
	65	/* s64 binary comparators */
	66	[ FILTER_OP_EQ_S64 ] = "EQ_S64",
	67	[ FILTER_OP_NE_S64 ] = "NE_S64",
	68	[ FILTER_OP_GT_S64 ] = "GT_S64",
	69	[ FILTER_OP_LT_S64 ] = "LT_S64",
	70	[ FILTER_OP_GE_S64 ] = "GE_S64",
	71	[ FILTER_OP_LE_S64 ] = "LE_S64",
	72
	73	/* double binary comparators */
	74	[ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE",
	75	[ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE",
	76	[ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE",
	77	[ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE",
	78	[ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE",
	79	[ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE",
	80
	81	/* Mixed S64-double binary comparators */
	82	[ FILTER_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64",
	83	[ FILTER_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64",
	84	[ FILTER_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64",
	85	[ FILTER_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64",
	86	[ FILTER_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64",
	87	[ FILTER_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64",
	88
	89	[ FILTER_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE",
	90	[ FILTER_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE",
	91	[ FILTER_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE",
	92	[ FILTER_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE",
	93	[ FILTER_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE",
	94	[ FILTER_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE",
	95
	96	/* unary */
	97	[ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
	98	[ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
	99	[ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
	100	[ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64",
	101	[ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64",
	102	[ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64",
	103	[ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE",
	104	[ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE",
	105	[ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE",
	106
	107	/* logical */
	108	[ FILTER_OP_AND ] = "AND",
	109	[ FILTER_OP_OR ] = "OR",
	110
	111	/* load field ref */
112	[ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
113	[ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING",
114	[ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE",
115	[ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64",
116	[ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE",
117
118	/* load from immediate operand */
119	[ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
120	[ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
121	[ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",
122
123	/* cast */
124	[ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64",
125	[ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64",
126	[ FILTER_OP_CAST_NOP ] = "CAST_NOP",
127
128	/* get context ref */
129	[ FILTER_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF",
130	[ FILTER_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING",
131	[ FILTER_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64",
132	[ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE",
f127e61e MD	133
	134	/* load userspace field ref */
	135	[ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING",
	136	[ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = "LOAD_FIELD_REF_USER_SEQUENCE",
83fb57ab MD	137
	138	/*
	139	* load immediate star globbing pattern (literal string)
	140	* from immediate.
	141	*/
	142	[ FILTER_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING",
	143
	144	/* globbing pattern binary operator: apply to */
	145	[ FILTER_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING",
	146	[ FILTER_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING",
3834b99f MD	147
	148	/*
	149	* Instructions for recursive traversal through composed types.
	150	*/
	151	[ FILTER_OP_GET_CONTEXT_ROOT ] = "GET_CONTEXT_ROOT",
	152	[ FILTER_OP_GET_APP_CONTEXT_ROOT ] = "GET_APP_CONTEXT_ROOT",
	153	[ FILTER_OP_GET_PAYLOAD_ROOT ] = "GET_PAYLOAD_ROOT",
	154
	155	[ FILTER_OP_GET_SYMBOL ] = "GET_SYMBOL",
	156	[ FILTER_OP_GET_SYMBOL_FIELD ] = "GET_SYMBOL_FIELD",
	157	[ FILTER_OP_GET_INDEX_U16 ] = "GET_INDEX_U16",
	158	[ FILTER_OP_GET_INDEX_U64 ] = "GET_INDEX_U64",
	159
	160	[ FILTER_OP_LOAD_FIELD ] = "LOAD_FIELD",
	161	[ FILTER_OP_LOAD_FIELD_S8 ] = "LOAD_FIELD_S8",
	162	[ FILTER_OP_LOAD_FIELD_S16 ] = "LOAD_FIELD_S16",
	163	[ FILTER_OP_LOAD_FIELD_S32 ] = "LOAD_FIELD_S32",
	164	[ FILTER_OP_LOAD_FIELD_S64 ] = "LOAD_FIELD_S64",
	165	[ FILTER_OP_LOAD_FIELD_U8 ] = "LOAD_FIELD_U8",
	166	[ FILTER_OP_LOAD_FIELD_U16 ] = "LOAD_FIELD_U16",
	167	[ FILTER_OP_LOAD_FIELD_U32 ] = "LOAD_FIELD_U32",
	168	[ FILTER_OP_LOAD_FIELD_U64 ] = "LOAD_FIELD_U64",
	169	[ FILTER_OP_LOAD_FIELD_STRING ] = "LOAD_FIELD_STRING",
	170	[ FILTER_OP_LOAD_FIELD_SEQUENCE ] = "LOAD_FIELD_SEQUENCE",
	171	[ FILTER_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE",
e16c054b MD	172
e16c054b MD	173	[ FILTER_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT",
57ba4b41 MD	174
57ba4b41 MD	175	[ FILTER_OP_RETURN_S64 ] = "RETURN_S64",
07dfc1d0 MD	176	};
	177
	178	const char *lttng_filter_print_op(enum filter_op op)
	179	{
	180	if (op >= NR_FILTER_OPS)
	181	return "UNKNOWN";
	182	else
	183	return opnames[op];
	184	}
	185
	186	static
	187	int apply_field_reloc(struct lttng_event *event,
	188	struct bytecode_runtime *runtime,
	189	uint32_t runtime_len,
	190	uint32_t reloc_offset,
3834b99f MD	191	const char *field_name,
3834b99f MD	192	enum filter_op filter_op)
07dfc1d0 MD	193	{
	194	const struct lttng_event_desc *desc;
	195	const struct lttng_event_field fields, field = NULL;
	196	unsigned int nr_fields, i;
07dfc1d0 MD	197	struct load_op *op;
	198	uint32_t field_offset = 0;
	199
	200	dbg_printk("Apply field reloc: %u %s\n", reloc_offset, field_name);
	201
	202	/* Lookup event by name */
	203	desc = event->desc;
	204	if (!desc)
	205	return -EINVAL;
	206	fields = desc->fields;
	207	if (!fields)
	208	return -EINVAL;
	209	nr_fields = desc->nr_fields;
	210	for (i = 0; i < nr_fields; i++) {
	211	if (!strcmp(fields[i].name, field_name)) {
	212	field = &fields[i];
	213	break;
	214	}
	215	/* compute field offset */
	216	switch (fields[i].type.atype) {
	217	case atype_integer:
	218	case atype_enum:
	219	field_offset += sizeof(int64_t);
	220	break;
	221	case atype_array:
	222	case atype_sequence:
3834b99f MD	223	case atype_array_bitfield:
3834b99f MD	224	case atype_sequence_bitfield:
07dfc1d0 MD	225	field_offset += sizeof(unsigned long);
	226	field_offset += sizeof(void *);
	227	break;
	228	case atype_string:
	229	field_offset += sizeof(void *);
	230	break;
f513b2bf MD	231	case atype_struct: /* Unsupported. */
	232	case atype_array_compound: /* Unsupported. */
	233	case atype_sequence_compound: /* Unsupported. */
65c85aa6	234	case atype_variant: /* Unsupported. */
07dfc1d0 MD	235	default:
	236	return -EINVAL;
	237	}
	238	}
	239	if (!field)
	240	return -EINVAL;
	241
	242	/* Check if field offset is too large for 16-bit offset */
f127e61e	243	if (field_offset > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1)
07dfc1d0 MD	244	return -EINVAL;
	245
	246	/* set type */
3834b99f MD	247	op = (struct load_op *) &runtime->code[reloc_offset];
	248
	249	switch (filter_op) {
	250	case FILTER_OP_LOAD_FIELD_REF:
	251	{
	252	struct field_ref *field_ref;
	253
	254	field_ref = (struct field_ref *) op->data;
	255	switch (field->type.atype) {
	256	case atype_integer:
	257	case atype_enum:
	258	op->op = FILTER_OP_LOAD_FIELD_REF_S64;
	259	break;
	260	case atype_array:
	261	case atype_sequence:
	262	if (field->user)
	263	op->op = FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE;
	264	else
	265	op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
	266	break;
	267	case atype_string:
	268	if (field->user)
	269	op->op = FILTER_OP_LOAD_FIELD_REF_USER_STRING;
	270	else
	271	op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
	272	break;
	273	case atype_struct: /* Unsupported. */
	274	case atype_array_compound: /* Unsupported. */
	275	case atype_sequence_compound: /* Unsupported. */
	276	case atype_variant: /* Unsupported. */
	277	case atype_array_bitfield: /* Unsupported. */
	278	case atype_sequence_bitfield: /* Unsupported. */
	279	default:
	280	return -EINVAL;
	281	}
	282	/* set offset */
	283	field_ref->offset = (uint16_t) field_offset;
07dfc1d0	284	break;
3834b99f	285	}
07dfc1d0 MD	286	default:
	287	return -EINVAL;
	288	}
07dfc1d0 MD	289	return 0;
	290	}
	291
	292	static
	293	int apply_context_reloc(struct lttng_event *event,
	294	struct bytecode_runtime *runtime,
	295	uint32_t runtime_len,
	296	uint32_t reloc_offset,
3834b99f MD	297	const char *context_name,
3834b99f MD	298	enum filter_op filter_op)
07dfc1d0	299	{
07dfc1d0 MD	300	struct load_op *op;
	301	struct lttng_ctx_field *ctx_field;
	302	int idx;
	303
	304	dbg_printk("Apply context reloc: %u %s\n", reloc_offset, context_name);
	305
	306	/* Get context index */
	307	idx = lttng_get_context_index(lttng_static_ctx, context_name);
	308	if (idx < 0)
	309	return -ENOENT;
	310
	311	/* Check if idx is too large for 16-bit offset */
f127e61e	312	if (idx > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1)
07dfc1d0 MD	313	return -EINVAL;
	314
	315	/* Get context return type */
	316	ctx_field = &lttng_static_ctx->fields[idx];
3834b99f MD	317	op = (struct load_op *) &runtime->code[reloc_offset];
	318
	319	switch (filter_op) {
	320	case FILTER_OP_GET_CONTEXT_REF:
	321	{
	322	struct field_ref *field_ref;
	323
	324	field_ref = (struct field_ref *) op->data;
	325	switch (ctx_field->event_field.type.atype) {
	326	case atype_integer:
	327	case atype_enum:
	328	op->op = FILTER_OP_GET_CONTEXT_REF_S64;
	329	break;
	330	/* Sequence and array supported as string */
	331	case atype_string:
	332	case atype_array:
	333	case atype_sequence:
	334	BUG_ON(ctx_field->event_field.user);
	335	op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
	336	break;
	337	case atype_struct: /* Unsupported. */
	338	case atype_array_compound: /* Unsupported. */
	339	case atype_sequence_compound: /* Unsupported. */
	340	case atype_variant: /* Unsupported. */
	341	case atype_array_bitfield: /* Unsupported. */
	342	case atype_sequence_bitfield: /* Unsupported. */
	343	default:
	344	return -EINVAL;
	345	}
	346	/* set offset to context index within channel contexts */
	347	field_ref->offset = (uint16_t) idx;
07dfc1d0	348	break;
3834b99f	349	}
07dfc1d0 MD	350	default:
	351	return -EINVAL;
	352	}
07dfc1d0 MD	353	return 0;
	354	}
	355
	356	static
	357	int apply_reloc(struct lttng_event *event,
	358	struct bytecode_runtime *runtime,
	359	uint32_t runtime_len,
	360	uint32_t reloc_offset,
	361	const char *name)
	362	{
	363	struct load_op *op;
	364
	365	dbg_printk("Apply reloc: %u %s\n", reloc_offset, name);
	366
	367	/* Ensure that the reloc is within the code */
	368	if (runtime_len - reloc_offset < sizeof(uint16_t))
	369	return -EINVAL;
	370
3834b99f	371	op = (struct load_op *) &runtime->code[reloc_offset];
07dfc1d0 MD	372	switch (op->op) {
	373	case FILTER_OP_LOAD_FIELD_REF:
	374	return apply_field_reloc(event, runtime, runtime_len,
3834b99f	375	reloc_offset, name, op->op);
07dfc1d0 MD	376	case FILTER_OP_GET_CONTEXT_REF:
07dfc1d0 MD	377	return apply_context_reloc(event, runtime, runtime_len,
3834b99f MD	378	reloc_offset, name, op->op);
	379	case FILTER_OP_GET_SYMBOL:
	380	case FILTER_OP_GET_SYMBOL_FIELD:
	381	/*
	382	* Will be handled by load specialize phase or
	383	* dynamically by interpreter.
	384	*/
	385	return 0;
07dfc1d0 MD	386	default:
	387	printk(KERN_WARNING "Unknown reloc op type %u\n", op->op);
	388	return -EINVAL;
	389	}
	390	return 0;
	391	}
	392
	393	static
	394	int bytecode_is_linked(struct lttng_filter_bytecode_node *filter_bytecode,
	395	struct lttng_event *event)
	396	{
	397	struct lttng_bytecode_runtime *bc_runtime;
	398
	399	list_for_each_entry(bc_runtime,
	400	&event->bytecode_runtime_head, node) {
	401	if (bc_runtime->bc == filter_bytecode)
	402	return 1;
	403	}
	404	return 0;
	405	}
	406
	407	/*
	408	* Take a bytecode with reloc table and link it to an event to create a
	409	* bytecode runtime.
	410	*/
	411	static
	412	int _lttng_filter_event_link_bytecode(struct lttng_event *event,
	413	struct lttng_filter_bytecode_node *filter_bytecode,
	414	struct list_head *insert_loc)
	415	{
	416	int ret, offset, next_offset;
	417	struct bytecode_runtime *runtime = NULL;
	418	size_t runtime_alloc_len;
	419
	420	if (!filter_bytecode)
	421	return 0;
	422	/* Bytecode already linked */
	423	if (bytecode_is_linked(filter_bytecode, event))
	424	return 0;
	425
	426	dbg_printk("Linking...\n");
	427
	428	/* We don't need the reloc table in the runtime */
	429	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset;
	430	runtime = kzalloc(runtime_alloc_len, GFP_KERNEL);
	431	if (!runtime) {
	432	ret = -ENOMEM;
	433	goto alloc_error;
	434	}
	435	runtime->p.bc = filter_bytecode;
3834b99f	436	runtime->p.event = event;
07dfc1d0 MD	437	runtime->len = filter_bytecode->bc.reloc_offset;
07dfc1d0 MD	438	/* copy original bytecode */
3834b99f	439	memcpy(runtime->code, filter_bytecode->bc.data, runtime->len);
07dfc1d0 MD	440	/*
	441	* apply relocs. Those are a uint16_t (offset in bytecode)
	442	* followed by a string (field name).
	443	*/
	444	for (offset = filter_bytecode->bc.reloc_offset;
	445	offset < filter_bytecode->bc.len;
	446	offset = next_offset) {
	447	uint16_t reloc_offset =
	448	(uint16_t ) &filter_bytecode->bc.data[offset];
	449	const char *name =
	450	(const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)];
	451
	452	ret = apply_reloc(event, runtime, runtime->len, reloc_offset, name);
	453	if (ret) {
	454	goto link_error;
	455	}
	456	next_offset = offset + sizeof(uint16_t) + strlen(name) + 1;
	457	}
	458	/* Validate bytecode */
	459	ret = lttng_filter_validate_bytecode(runtime);
	460	if (ret) {
	461	goto link_error;
	462	}
	463	/* Specialize bytecode */
3834b99f	464	ret = lttng_filter_specialize_bytecode(event, runtime);
07dfc1d0 MD	465	if (ret) {
	466	goto link_error;
	467	}
	468	runtime->p.filter = lttng_filter_interpret_bytecode;
	469	runtime->p.link_failed = 0;
	470	list_add_rcu(&runtime->p.node, insert_loc);
	471	dbg_printk("Linking successful.\n");
	472	return 0;
	473
	474	link_error:
	475	runtime->p.filter = lttng_filter_false;
	476	runtime->p.link_failed = 1;
	477	list_add_rcu(&runtime->p.node, insert_loc);
	478	alloc_error:
	479	dbg_printk("Linking failed.\n");
	480	return ret;
	481	}
	482
	483	void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime)
	484	{
	485	struct lttng_filter_bytecode_node *bc = runtime->bc;
	486
	487	if (!bc->enabler->enabled \|\| runtime->link_failed)
	488	runtime->filter = lttng_filter_false;
	489	else
	490	runtime->filter = lttng_filter_interpret_bytecode;
	491	}
	492
	493	/*
	494	* Link bytecode for all enablers referenced by an event.
	495	*/
	496	void lttng_enabler_event_link_bytecode(struct lttng_event *event,
	497	struct lttng_enabler *enabler)
	498	{
	499	struct lttng_filter_bytecode_node *bc;
	500	struct lttng_bytecode_runtime *runtime;
	501
	502	/* Can only be called for events with desc attached */
	503	WARN_ON_ONCE(!event->desc);
	504
	505	/* Link each bytecode. */
	506	list_for_each_entry(bc, &enabler->filter_bytecode_head, node) {
	507	int found = 0, ret;
	508	struct list_head *insert_loc;
	509
	510	list_for_each_entry(runtime,
	511	&event->bytecode_runtime_head, node) {
	512	if (runtime->bc == bc) {
	513	found = 1;
	514	break;
	515	}
	516	}
	517	/* Skip bytecode already linked */
	518	if (found)
	519	continue;
	520
	521	/*
	522	* Insert at specified priority (seqnum) in increasing
	523	* order.
	524	*/
	525	list_for_each_entry_reverse(runtime,
	526	&event->bytecode_runtime_head, node) {
	527	if (runtime->bc->bc.seqnum < bc->bc.seqnum) {
	528	/* insert here */
529	insert_loc = &runtime->node;
530	goto add_within;
531	}
532	}
533	/* Add to head to list */
534	insert_loc = &event->bytecode_runtime_head;
535	add_within:
536	dbg_printk("linking bytecode\n");
537	ret = _lttng_filter_event_link_bytecode(event, bc,
538	insert_loc);
539	if (ret) {
540	dbg_printk("[lttng filter] warning: cannot link event bytecode\n");
541	}
542	}
543	}
544
545	/*
546	* We own the filter_bytecode if we return success.
547	*/
548	int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler,
549	struct lttng_filter_bytecode_node *filter_bytecode)
550	{
551	list_add(&filter_bytecode->node, &enabler->filter_bytecode_head);
552	return 0;
553	}
554
555	void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler)
556	{
557	struct lttng_filter_bytecode_node filter_bytecode, tmp;
558
559	list_for_each_entry_safe(filter_bytecode, tmp,
560	&enabler->filter_bytecode_head, node) {
561	kfree(filter_bytecode);
562	}
563	}
564
565	void lttng_free_event_filter_runtime(struct lttng_event *event)
566	{
567	struct bytecode_runtime runtime, tmp;
568
569	list_for_each_entry_safe(runtime, tmp,
570	&event->bytecode_runtime_head, p.node) {
3834b99f	571	kfree(runtime->data);
07dfc1d0 MD	572	kfree(runtime);
	573	}
	574	}