[lttng-tools.git] / src / common / event-rule / kernel-probe.c

/*
 * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#include <assert.h>
#include <common/credentials.h>
#include <common/error.h>
#include <common/macros.h>
#include <common/payload.h>
#include <common/payload-view.h>
#include <common/runas.h>
#include <common/hashtable/hashtable.h>
#include <common/hashtable/utils.h>
#include <ctype.h>
#include <lttng/constant.h>
#include <lttng/event-rule/event-rule-internal.h>
#include <lttng/event-rule/kernel-probe-internal.h>
#include <lttng/kernel-probe.h>
#include <lttng/kernel-probe-internal.h>
#include <stdio.h>

#define IS_KPROBE_EVENT_RULE(rule) \
	(lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE)

#if (LTTNG_SYMBOL_NAME_LEN == 256)
#define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
#endif

static void lttng_event_rule_kernel_probe_destroy(struct lttng_event_rule *rule)
{
	struct lttng_event_rule_kernel_probe *kprobe;

	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);

	lttng_kernel_probe_location_destroy(kprobe->location);
	free(kprobe->name);
	free(kprobe);
}

static bool lttng_event_rule_kernel_probe_validate(
		const struct lttng_event_rule *rule)
{
	bool valid = false;
	struct lttng_event_rule_kernel_probe *kprobe;

	if (!rule) {
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);

	/* Required field. */
	if (!kprobe->name) {
		ERR("Invalid name event rule: a name must be set.");
		goto end;
	}

	/* Required field. */
	if(!kprobe->location) {
		ERR("Invalid name event rule: a location must be set.");
		goto end;
	}

	valid = true;
end:
	return valid;
}

static int lttng_event_rule_kernel_probe_serialize(
		const struct lttng_event_rule *rule,
		struct lttng_payload *payload)
{
	int ret;
	size_t name_len, header_offset, size_before_location;
	struct lttng_event_rule_kernel_probe *kprobe;
	struct lttng_event_rule_kernel_probe_comm kprobe_comm;
	struct lttng_event_rule_kernel_probe_comm *header;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule)) {
		ret = -1;
		goto end;
	}

	header_offset = payload->buffer.size;

	DBG("Serializing kprobe event rule.");
	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);

	name_len = strlen(kprobe->name) + 1;
	kprobe_comm.name_len = name_len;

	ret = lttng_dynamic_buffer_append(
			&payload->buffer, &kprobe_comm, sizeof(kprobe_comm));
	if (ret) {
		goto end;
	}

	ret = lttng_dynamic_buffer_append(&payload->buffer, kprobe->name, name_len);
	if (ret) {
		goto end;
	}

	size_before_location = payload->buffer.size;

	ret = lttng_kernel_probe_location_serialize(kprobe->location, payload);
	if (ret < 0) {
		goto end;
	}

	/* Update the header regarding the probe size. */
	header = (struct lttng_event_rule_kernel_probe_comm*) (
			(char *) payload->buffer.data + header_offset);
	header->location_len = payload->buffer.size - size_before_location;

	ret = 0;

end:
	return ret;
}

static bool lttng_event_rule_kernel_probe_is_equal(const struct lttng_event_rule *_a,
		const struct lttng_event_rule *_b)
{
	bool is_equal = false;
	struct lttng_event_rule_kernel_probe *a, *b;

	a = container_of(_a, struct lttng_event_rule_kernel_probe, parent);
	b = container_of(_b, struct lttng_event_rule_kernel_probe, parent);

	/* Quick checks */
	if (!!a->name != !!b->name) {
		goto end;
	}

	/* Long check */
	assert(a->name);
	assert(b->name);
	if (strcmp(a->name, b->name)) {
		goto end;
	}

	is_equal = lttng_kernel_probe_location_is_equal(
			a->location, b->location);
end:
	return is_equal;
}

static enum lttng_error_code lttng_event_rule_kernel_probe_generate_filter_bytecode(
		struct lttng_event_rule *rule,
		const struct lttng_credentials *creds)
{
	/* Nothing to do. */
	return LTTNG_OK;
}

static const char *lttng_event_rule_kernel_probe_get_filter(
		const struct lttng_event_rule *rule)
{
	/* Not supported. */
	return NULL;
}

static const struct lttng_bytecode *
lttng_event_rule_kernel_probe_get_filter_bytecode(const struct lttng_event_rule *rule)
{
	/* Not supported. */
	return NULL;
}

static enum lttng_event_rule_generate_exclusions_status
lttng_event_rule_kernel_probe_generate_exclusions(const struct lttng_event_rule *rule,
		struct lttng_event_exclusion **exclusions)
{
	/* Not supported. */
	*exclusions = NULL;
	return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE;
}

static unsigned long
lttng_event_rule_kernel_probe_hash(
		const struct lttng_event_rule *rule)
{
	unsigned long hash;
	struct lttng_event_rule_kernel_probe *krule =
			container_of(rule, typeof(*krule), parent);

	hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE,
			lttng_ht_seed);
	hash ^= hash_key_str(krule->name, lttng_ht_seed);
	hash ^= lttng_kernel_probe_location_hash(krule->location);

	return hash;
}

struct lttng_event_rule *lttng_event_rule_kernel_probe_create(void)
{
	struct lttng_event_rule *rule = NULL;
	struct lttng_event_rule_kernel_probe *krule;

	krule = zmalloc(sizeof(struct lttng_event_rule_kernel_probe));
	if (!krule) {
		goto end;
	}

	rule = &krule->parent;
	lttng_event_rule_init(&krule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE);
	krule->parent.validate = lttng_event_rule_kernel_probe_validate;
	krule->parent.serialize = lttng_event_rule_kernel_probe_serialize;
	krule->parent.equal = lttng_event_rule_kernel_probe_is_equal;
	krule->parent.destroy = lttng_event_rule_kernel_probe_destroy;
	krule->parent.generate_filter_bytecode =
			lttng_event_rule_kernel_probe_generate_filter_bytecode;
	krule->parent.get_filter = lttng_event_rule_kernel_probe_get_filter;
	krule->parent.get_filter_bytecode =
			lttng_event_rule_kernel_probe_get_filter_bytecode;
	krule->parent.generate_exclusions =
			lttng_event_rule_kernel_probe_generate_exclusions;
	krule->parent.hash = lttng_event_rule_kernel_probe_hash;
end:
	return rule;
}

LTTNG_HIDDEN
ssize_t lttng_event_rule_kernel_probe_create_from_payload(
		struct lttng_payload_view *view,
		struct lttng_event_rule **_event_rule)
{
	ssize_t ret, offset = 0;
	enum lttng_event_rule_status status;
	const struct lttng_event_rule_kernel_probe_comm *kprobe_comm;
	const char *name;
	struct lttng_buffer_view current_buffer_view;
	struct lttng_event_rule *rule = NULL;
	struct lttng_event_rule_kernel_probe *kprobe = NULL;
	struct lttng_kernel_probe_location *location;

	if (!_event_rule) {
		ret = -1;
		goto end;
	}

	current_buffer_view = lttng_buffer_view_from_view(
			&view->buffer, offset, sizeof(*kprobe_comm));
	if (!lttng_buffer_view_is_valid(&current_buffer_view)) {
		ERR("Failed to initialize from malformed event rule kprobe: buffer too short to contain header.");
		ret = -1;
		goto end;
	}

	kprobe_comm = (typeof(kprobe_comm)) current_buffer_view.data;

	rule = lttng_event_rule_kernel_probe_create();
	if (!rule) {
		ERR("Failed to create event rule kprobe.");
		ret = -1;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);

	/* Skip to payload */
	offset += current_buffer_view.size;

	{
		/* Map the name. */
		struct lttng_payload_view current_payload_view =
				lttng_payload_view_from_view(view, offset,
						kprobe_comm->name_len);

		if (!lttng_payload_view_is_valid(&current_payload_view)) {
			ret = -1;
			goto end;
		}

		name = current_payload_view.buffer.data;
		if (!lttng_buffer_view_contains_string(
				&current_payload_view.buffer, name,
				kprobe_comm->name_len)) {
			ret = -1;
			goto end;
		}
	}

	/* Skip after the name. */
	offset += kprobe_comm->name_len;

	/* Map the kernel probe location. */
	{
		struct lttng_payload_view current_payload_view =
				lttng_payload_view_from_view(view, offset,
						kprobe_comm->location_len);

		if (!lttng_payload_view_is_valid(&current_payload_view)) {
			ret = -1;
			goto end;
		}

		ret = lttng_kernel_probe_location_create_from_payload(
				&current_payload_view, &location);
		if (ret < 0) {
			ret = -1;
			goto end;
		}
	}

	if (ret != kprobe_comm->location_len) {
		ret = -1;
		goto end;
	}

	kprobe->location = location;

	/* Skip after the location */
	offset += kprobe_comm->location_len;

	status = lttng_event_rule_kernel_probe_set_event_name(rule, name);
	if (status != LTTNG_EVENT_RULE_STATUS_OK) {
		ERR("Failed to set event rule kprobe name.");
		ret = -1;
		goto end;
	}

	*_event_rule = rule;
	rule = NULL;
	ret = offset;
end:
	lttng_event_rule_destroy(rule);
	return ret;
}

enum lttng_event_rule_status lttng_event_rule_kernel_probe_set_location(
		struct lttng_event_rule *rule,
		const struct lttng_kernel_probe_location *location)
{
	struct lttng_kernel_probe_location *location_copy = NULL;
	struct lttng_event_rule_kernel_probe *kprobe;
	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !location) {
		status = LTTNG_EVENT_RULE_STATUS_INVALID;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
	location_copy = lttng_kernel_probe_location_copy(location);
	if (!location_copy) {
		status = LTTNG_EVENT_RULE_STATUS_ERROR;
		goto end;
	}

	if (kprobe->location) {
		lttng_kernel_probe_location_destroy(kprobe->location);
	}

	kprobe->location = location_copy;
	location_copy = NULL;
end:
	lttng_kernel_probe_location_destroy(location_copy);
	return status;
}

enum lttng_event_rule_status lttng_event_rule_kernel_probe_get_location(
		const struct lttng_event_rule *rule,
		const struct lttng_kernel_probe_location **location)
{
	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
	struct lttng_event_rule_kernel_probe *kprobe;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !location) {
		status = LTTNG_EVENT_RULE_STATUS_INVALID;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
	*location = kprobe->location;

	if (!*location) {
		status = LTTNG_EVENT_RULE_STATUS_UNSET;
		goto end;
	}

end:
	return status;
}

enum lttng_event_rule_status lttng_event_rule_kernel_probe_set_event_name(
		struct lttng_event_rule *rule, const char *name)
{
	char *name_copy = NULL;
	struct lttng_event_rule_kernel_probe *kprobe;
	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !name ||
			strlen(name) == 0) {
		status = LTTNG_EVENT_RULE_STATUS_INVALID;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
	name_copy = strdup(name);
	if (!name_copy) {
		status = LTTNG_EVENT_RULE_STATUS_ERROR;
		goto end;
	}

	free(kprobe->name);

	kprobe->name = name_copy;
	name_copy = NULL;
end:
	return status;
}

enum lttng_event_rule_status lttng_event_rule_kernel_probe_get_event_name(
		const struct lttng_event_rule *rule, const char **name)
{
	struct lttng_event_rule_kernel_probe *kprobe;
	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !name) {
		status = LTTNG_EVENT_RULE_STATUS_INVALID;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
	if (!kprobe->name) {
		status = LTTNG_EVENT_RULE_STATUS_UNSET;
		goto end;
	}

	*name = kprobe->name;
end:
	return status;
}
Commit	Line	Data
077192fd JR	1	/*
	2	* Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
	3	*
	4	* SPDX-License-Identifier: LGPL-2.1-only
	5	*
	6	*/
	7
	8	#include <assert.h>
58daac01	9	#include <common/credentials.h>
077192fd JR	10	#include <common/error.h>
	11	#include <common/macros.h>
	12	#include <common/payload.h>
	13	#include <common/payload-view.h>
	14	#include <common/runas.h>
959e3c66 JR	15	#include <common/hashtable/hashtable.h>
959e3c66 JR	16	#include <common/hashtable/utils.h>
077192fd JR	17	#include <ctype.h>
	18	#include <lttng/constant.h>
	19	#include <lttng/event-rule/event-rule-internal.h>
a3c51653	20	#include <lttng/event-rule/kernel-probe-internal.h>
077192fd JR	21	#include <lttng/kernel-probe.h>
	22	#include <lttng/kernel-probe-internal.h>
	23	#include <stdio.h>
	24
	25	#define IS_KPROBE_EVENT_RULE(rule) \
f2791161	26	(lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE)
077192fd JR	27
	28	#if (LTTNG_SYMBOL_NAME_LEN == 256)
	29	#define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
	30	#endif
	31
f2791161	32	static void lttng_event_rule_kernel_probe_destroy(struct lttng_event_rule *rule)
077192fd	33	{
f2791161	34	struct lttng_event_rule_kernel_probe *kprobe;
077192fd	35
f2791161	36	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	37
	38	lttng_kernel_probe_location_destroy(kprobe->location);
	39	free(kprobe->name);
	40	free(kprobe);
	41	}
	42
f2791161	43	static bool lttng_event_rule_kernel_probe_validate(
077192fd JR	44	const struct lttng_event_rule *rule)
	45	{
	46	bool valid = false;
f2791161	47	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	48
	49	if (!rule) {
	50	goto end;
	51	}
	52
f2791161	53	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	54
	55	/* Required field. */
	56	if (!kprobe->name) {
	57	ERR("Invalid name event rule: a name must be set.");
	58	goto end;
	59	}
	60
	61	/* Required field. */
	62	if(!kprobe->location) {
	63	ERR("Invalid name event rule: a location must be set.");
	64	goto end;
	65	}
	66
	67	valid = true;
	68	end:
	69	return valid;
	70	}
	71
f2791161	72	static int lttng_event_rule_kernel_probe_serialize(
077192fd JR	73	const struct lttng_event_rule *rule,
	74	struct lttng_payload *payload)
	75	{
	76	int ret;
	77	size_t name_len, header_offset, size_before_location;
f2791161 JR	78	struct lttng_event_rule_kernel_probe *kprobe;
	79	struct lttng_event_rule_kernel_probe_comm kprobe_comm;
	80	struct lttng_event_rule_kernel_probe_comm *header;
077192fd JR	81
	82	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule)) {
	83	ret = -1;
	84	goto end;
	85	}
	86
	87	header_offset = payload->buffer.size;
	88
	89	DBG("Serializing kprobe event rule.");
f2791161	90	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	91
	92	name_len = strlen(kprobe->name) + 1;
	93	kprobe_comm.name_len = name_len;
	94
	95	ret = lttng_dynamic_buffer_append(
	96	&payload->buffer, &kprobe_comm, sizeof(kprobe_comm));
	97	if (ret) {
	98	goto end;
	99	}
	100
	101	ret = lttng_dynamic_buffer_append(&payload->buffer, kprobe->name, name_len);
	102	if (ret) {
	103	goto end;
	104	}
	105
	106	size_before_location = payload->buffer.size;
	107
	108	ret = lttng_kernel_probe_location_serialize(kprobe->location, payload);
	109	if (ret < 0) {
	110	goto end;
	111	}
	112
	113	/* Update the header regarding the probe size. */
f2791161	114	header = (struct lttng_event_rule_kernel_probe_comm*) (
077192fd JR	115	(char *) payload->buffer.data + header_offset);
	116	header->location_len = payload->buffer.size - size_before_location;
	117
	118	ret = 0;
	119
	120	end:
	121	return ret;
	122	}
	123
f2791161	124	static bool lttng_event_rule_kernel_probe_is_equal(const struct lttng_event_rule *_a,
077192fd JR	125	const struct lttng_event_rule *_b)
	126	{
	127	bool is_equal = false;
f2791161	128	struct lttng_event_rule_kernel_probe a, b;
077192fd	129
f2791161 JR	130	a = container_of(_a, struct lttng_event_rule_kernel_probe, parent);
f2791161 JR	131	b = container_of(_b, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	132
	133	/* Quick checks */
	134	if (!!a->name != !!b->name) {
	135	goto end;
	136	}
	137
	138	/* Long check */
	139	assert(a->name);
	140	assert(b->name);
	141	if (strcmp(a->name, b->name)) {
	142	goto end;
	143	}
	144
	145	is_equal = lttng_kernel_probe_location_is_equal(
	146	a->location, b->location);
	147	end:
	148	return is_equal;
	149	}
	150
f2791161	151	static enum lttng_error_code lttng_event_rule_kernel_probe_generate_filter_bytecode(
58daac01 JR	152	struct lttng_event_rule *rule,
58daac01 JR	153	const struct lttng_credentials *creds)
077192fd JR	154	{
	155	/* Nothing to do. */
	156	return LTTNG_OK;
	157	}
	158
f2791161	159	static const char *lttng_event_rule_kernel_probe_get_filter(
077192fd JR	160	const struct lttng_event_rule *rule)
	161	{
	162	/* Not supported. */
	163	return NULL;
	164	}
	165
2b00d462	166	static const struct lttng_bytecode *
f2791161	167	lttng_event_rule_kernel_probe_get_filter_bytecode(const struct lttng_event_rule *rule)
077192fd JR	168	{
	169	/* Not supported. */
	170	return NULL;
	171	}
	172
993578ff	173	static enum lttng_event_rule_generate_exclusions_status
f2791161	174	lttng_event_rule_kernel_probe_generate_exclusions(const struct lttng_event_rule *rule,
993578ff	175	struct lttng_event_exclusion **exclusions)
077192fd JR	176	{
077192fd JR	177	/* Not supported. */
993578ff JR	178	*exclusions = NULL;
993578ff JR	179	return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE;
077192fd JR	180	}
077192fd JR	181
959e3c66	182	static unsigned long
f2791161	183	lttng_event_rule_kernel_probe_hash(
959e3c66 JR	184	const struct lttng_event_rule *rule)
	185	{
	186	unsigned long hash;
f2791161	187	struct lttng_event_rule_kernel_probe *krule =
959e3c66 JR	188	container_of(rule, typeof(*krule), parent);
959e3c66 JR	189
f2791161	190	hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE,
959e3c66 JR	191	lttng_ht_seed);
	192	hash ^= hash_key_str(krule->name, lttng_ht_seed);
	193	hash ^= lttng_kernel_probe_location_hash(krule->location);
	194
	195	return hash;
	196	}
	197
f2791161	198	struct lttng_event_rule *lttng_event_rule_kernel_probe_create(void)
077192fd JR	199	{
077192fd JR	200	struct lttng_event_rule *rule = NULL;
f2791161	201	struct lttng_event_rule_kernel_probe *krule;
077192fd	202
f2791161	203	krule = zmalloc(sizeof(struct lttng_event_rule_kernel_probe));
077192fd JR	204	if (!krule) {
	205	goto end;
	206	}
	207
	208	rule = &krule->parent;
f2791161 JR	209	lttng_event_rule_init(&krule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE);
	210	krule->parent.validate = lttng_event_rule_kernel_probe_validate;
	211	krule->parent.serialize = lttng_event_rule_kernel_probe_serialize;
	212	krule->parent.equal = lttng_event_rule_kernel_probe_is_equal;
	213	krule->parent.destroy = lttng_event_rule_kernel_probe_destroy;
077192fd	214	krule->parent.generate_filter_bytecode =
f2791161 JR	215	lttng_event_rule_kernel_probe_generate_filter_bytecode;
f2791161 JR	216	krule->parent.get_filter = lttng_event_rule_kernel_probe_get_filter;
077192fd	217	krule->parent.get_filter_bytecode =
f2791161	218	lttng_event_rule_kernel_probe_get_filter_bytecode;
077192fd	219	krule->parent.generate_exclusions =
f2791161 JR	220	lttng_event_rule_kernel_probe_generate_exclusions;
f2791161 JR	221	krule->parent.hash = lttng_event_rule_kernel_probe_hash;
077192fd JR	222	end:
	223	return rule;
	224	}
	225
	226	LTTNG_HIDDEN
f2791161	227	ssize_t lttng_event_rule_kernel_probe_create_from_payload(
077192fd JR	228	struct lttng_payload_view *view,
	229	struct lttng_event_rule **_event_rule)
	230	{
	231	ssize_t ret, offset = 0;
	232	enum lttng_event_rule_status status;
f2791161	233	const struct lttng_event_rule_kernel_probe_comm *kprobe_comm;
077192fd JR	234	const char *name;
	235	struct lttng_buffer_view current_buffer_view;
	236	struct lttng_event_rule *rule = NULL;
f2791161	237	struct lttng_event_rule_kernel_probe *kprobe = NULL;
077192fd JR	238	struct lttng_kernel_probe_location *location;
	239
	240	if (!_event_rule) {
	241	ret = -1;
	242	goto end;
	243	}
	244
3e6e0df2 JG	245	current_buffer_view = lttng_buffer_view_from_view(
	246	&view->buffer, offset, sizeof(*kprobe_comm));
	247	if (!lttng_buffer_view_is_valid(&current_buffer_view)) {
077192fd JR	248	ERR("Failed to initialize from malformed event rule kprobe: buffer too short to contain header.");
	249	ret = -1;
	250	goto end;
	251	}
	252
077192fd	253	kprobe_comm = (typeof(kprobe_comm)) current_buffer_view.data;
077192fd	254
f2791161	255	rule = lttng_event_rule_kernel_probe_create();
077192fd JR	256	if (!rule) {
	257	ERR("Failed to create event rule kprobe.");
	258	ret = -1;
	259	goto end;
	260	}
	261
f2791161	262	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	263
	264	/* Skip to payload */
	265	offset += current_buffer_view.size;
	266
	267	{
	268	/* Map the name. */
	269	struct lttng_payload_view current_payload_view =
	270	lttng_payload_view_from_view(view, offset,
	271	kprobe_comm->name_len);
	272
3e6e0df2	273	if (!lttng_payload_view_is_valid(&current_payload_view)) {
077192fd JR	274	ret = -1;
	275	goto end;
	276	}
	277
3e6e0df2	278	name = current_payload_view.buffer.data;
077192fd JR	279	if (!lttng_buffer_view_contains_string(
	280	&current_payload_view.buffer, name,
	281	kprobe_comm->name_len)) {
	282	ret = -1;
	283	goto end;
	284	}
	285	}
	286
	287	/* Skip after the name. */
	288	offset += kprobe_comm->name_len;
	289
	290	/* Map the kernel probe location. */
	291	{
	292	struct lttng_payload_view current_payload_view =
	293	lttng_payload_view_from_view(view, offset,
	294	kprobe_comm->location_len);
	295
3e6e0df2 JG	296	if (!lttng_payload_view_is_valid(&current_payload_view)) {
	297	ret = -1;
	298	goto end;
	299	}
	300
077192fd JR	301	ret = lttng_kernel_probe_location_create_from_payload(
	302	&current_payload_view, &location);
	303	if (ret < 0) {
	304	ret = -1;
	305	goto end;
	306	}
	307	}
	308
	309	if (ret != kprobe_comm->location_len) {
	310	ret = -1;
	311	goto end;
	312	}
	313
	314	kprobe->location = location;
	315
	316	/* Skip after the location */
	317	offset += kprobe_comm->location_len;
	318
d891bb52	319	status = lttng_event_rule_kernel_probe_set_event_name(rule, name);
077192fd JR	320	if (status != LTTNG_EVENT_RULE_STATUS_OK) {
	321	ERR("Failed to set event rule kprobe name.");
	322	ret = -1;
	323	goto end;
	324	}
	325
	326	*_event_rule = rule;
	327	rule = NULL;
	328	ret = offset;
	329	end:
	330	lttng_event_rule_destroy(rule);
	331	return ret;
	332	}
	333
f2791161	334	enum lttng_event_rule_status lttng_event_rule_kernel_probe_set_location(
077192fd JR	335	struct lttng_event_rule *rule,
	336	const struct lttng_kernel_probe_location *location)
	337	{
	338	struct lttng_kernel_probe_location *location_copy = NULL;
f2791161	339	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	340	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
	341
	342	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !location) {
	343	status = LTTNG_EVENT_RULE_STATUS_INVALID;
	344	goto end;
	345	}
	346
f2791161	347	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	348	location_copy = lttng_kernel_probe_location_copy(location);
	349	if (!location_copy) {
	350	status = LTTNG_EVENT_RULE_STATUS_ERROR;
	351	goto end;
	352	}
	353
	354	if (kprobe->location) {
	355	lttng_kernel_probe_location_destroy(kprobe->location);
	356	}
	357
	358	kprobe->location = location_copy;
	359	location_copy = NULL;
	360	end:
	361	lttng_kernel_probe_location_destroy(location_copy);
	362	return status;
	363	}
	364
f2791161	365	enum lttng_event_rule_status lttng_event_rule_kernel_probe_get_location(
077192fd JR	366	const struct lttng_event_rule *rule,
	367	const struct lttng_kernel_probe_location **location)
	368	{
	369	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
f2791161	370	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	371
	372	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !location) {
	373	status = LTTNG_EVENT_RULE_STATUS_INVALID;
	374	goto end;
	375	}
	376
f2791161	377	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	378	*location = kprobe->location;
	379
	380	if (!*location) {
	381	status = LTTNG_EVENT_RULE_STATUS_UNSET;
	382	goto end;
	383	}
	384
	385	end:
	386	return status;
	387	}
	388
d891bb52	389	enum lttng_event_rule_status lttng_event_rule_kernel_probe_set_event_name(
077192fd JR	390	struct lttng_event_rule rule, const char name)
	391	{
	392	char *name_copy = NULL;
f2791161	393	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	394	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
	395
	396	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !name \|\|
	397	strlen(name) == 0) {
	398	status = LTTNG_EVENT_RULE_STATUS_INVALID;
	399	goto end;
	400	}
	401
f2791161	402	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	403	name_copy = strdup(name);
	404	if (!name_copy) {
	405	status = LTTNG_EVENT_RULE_STATUS_ERROR;
	406	goto end;
	407	}
	408
	409	free(kprobe->name);
	410
	411	kprobe->name = name_copy;
	412	name_copy = NULL;
	413	end:
	414	return status;
	415	}
	416
d891bb52	417	enum lttng_event_rule_status lttng_event_rule_kernel_probe_get_event_name(
077192fd JR	418	const struct lttng_event_rule rule, const char *name)
077192fd JR	419	{
f2791161	420	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	421	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
	422
	423	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !name) {
	424	status = LTTNG_EVENT_RULE_STATUS_INVALID;
	425	goto end;
	426	}
	427
f2791161	428	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	429	if (!kprobe->name) {
	430	status = LTTNG_EVENT_RULE_STATUS_UNSET;
	431	goto end;
	432	}
	433
	434	*name = kprobe->name;
	435	end:
	436	return status;
	437	}