Drop support for kernels < 3.0 from skb instrumentation

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

diff --git a/lttng-filter.h b/lttng-filter.h
index 6ce78ac49b2d138e84dcf1f57832caeb29eb8f52..fec2db1f6c3b2fad866a536587bed97fd959b0dd 100644 (file)
--- a/lttng-filter.h
+++ b/lttng-filter.h
@@ -1,32 +1,15 @@
-#ifndef _LTTNG_FILTER_H
-#define _LTTNG_FILTER_H
-
-/*
+/* SPDX-License-Identifier: MIT
+ *
  * lttng-filter.h
  *
  * LTTng modules filter header.
  *
  * 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.
  */
 
+#ifndef _LTTNG_FILTER_H
+#define _LTTNG_FILTER_H
+
 #include <linux/kernel.h>
 
 #include <lttng-events.h>
@@ -36,6 +19,8 @@
 #define FILTER_STACK_LEN       10      /* includes 2 dummy */
 #define FILTER_STACK_EMPTY     1
 
+#define FILTER_MAX_DATA_LEN    65536
+
 #ifdef DEBUG
 #define dbg_printk(fmt, args...)                               \
        printk(KERN_DEBUG "[debug bytecode in %s:%s@%u] " fmt,          \
@@ -53,20 +38,73 @@ do {                                                                \
 /* Linked bytecode. Child of struct lttng_bytecode_runtime. */
 struct bytecode_runtime {
        struct lttng_bytecode_runtime p;
+       size_t data_len;
+       size_t data_alloc_len;
+       char *data;
        uint16_t len;
-       char data[0];
+       char code[0];
 };
 
 enum entry_type {
        REG_S64,
        REG_DOUBLE,
        REG_STRING,
+       REG_STAR_GLOB_STRING,
        REG_TYPE_UNKNOWN,
+       REG_PTR,
+};
+
+enum load_type {
+       LOAD_ROOT_CONTEXT,
+       LOAD_ROOT_APP_CONTEXT,
+       LOAD_ROOT_PAYLOAD,
+       LOAD_OBJECT,
+};
+
+enum object_type {
+       OBJECT_TYPE_S8,
+       OBJECT_TYPE_S16,
+       OBJECT_TYPE_S32,
+       OBJECT_TYPE_S64,
+       OBJECT_TYPE_U8,
+       OBJECT_TYPE_U16,
+       OBJECT_TYPE_U32,
+       OBJECT_TYPE_U64,
+
+       OBJECT_TYPE_DOUBLE,
+       OBJECT_TYPE_STRING,
+       OBJECT_TYPE_STRING_SEQUENCE,
+
+       OBJECT_TYPE_SEQUENCE,
+       OBJECT_TYPE_ARRAY,
+       OBJECT_TYPE_STRUCT,
+       OBJECT_TYPE_VARIANT,
+
+       OBJECT_TYPE_DYNAMIC,
+};
+
+struct filter_get_index_data {
+       uint64_t offset;        /* in bytes */
+       size_t ctx_index;
+       size_t array_len;
+       struct {
+               size_t len;
+               enum object_type type;
+               bool rev_bo;    /* reverse byte order */
+       } elem;
 };
 
 /* Validation stack */
+struct vstack_load {
+       enum load_type type;
+       enum object_type object_type;
+       const struct lttng_event_field *field;
+       bool rev_bo;    /* reverse byte order */
+};
+
 struct vstack_entry {
        enum entry_type type;
+       struct vstack_load load;
 };
 
 struct vstack {
@@ -119,6 +157,30 @@ int vstack_pop(struct vstack *stack)
 }
 
 /* Execution stack */
+enum estack_string_literal_type {
+       ESTACK_STRING_LITERAL_TYPE_NONE,
+       ESTACK_STRING_LITERAL_TYPE_PLAIN,
+       ESTACK_STRING_LITERAL_TYPE_STAR_GLOB,
+};
+
+struct load_ptr {
+       enum load_type type;
+       enum object_type object_type;
+       const void *ptr;
+       bool rev_bo;
+       /* Temporary place-holders for contexts. */
+       union {
+               int64_t s64;
+               uint64_t u64;
+               double d;
+       } u;
+       /*
+        * "field" is only needed when nested under a variant, in which
+        * case we cannot specialize the nested operations.
+        */
+       const struct lttng_event_field *field;
+};
+
 struct estack_entry {
        union {
                int64_t v;
@@ -127,9 +189,10 @@ struct estack_entry {
                        const char *str;
                        const char __user *user_str;
                        size_t seq_len;
-                       int literal;            /* is string literal ? */
+                       enum estack_string_literal_type literal_type;
                        int user;               /* is string from userspace ? */
                } s;
+               struct load_ptr ptr;
        } u;
 };
 
@@ -172,7 +235,8 @@ struct estack {
 const char *lttng_filter_print_op(enum filter_op op);
 
 int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode);
-int lttng_filter_specialize_bytecode(struct bytecode_runtime *bytecode);
+int lttng_filter_specialize_bytecode(struct lttng_event *event,
+               struct bytecode_runtime *bytecode);
 
 uint64_t lttng_filter_false(void *filter_data,
                struct lttng_probe_ctx *lttng_probe_ctx,