Commit | Line | Data |
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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 |
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", | |
43 | [ FILTER_OP_RSHIFT ] = "RSHIFT", | |
44 | [ FILTER_OP_LSHIFT ] = "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", | |
07dfc1d0 MD |
172 | }; |
173 | ||
174 | const char *lttng_filter_print_op(enum filter_op op) | |
175 | { | |
176 | if (op >= NR_FILTER_OPS) | |
177 | return "UNKNOWN"; | |
178 | else | |
179 | return opnames[op]; | |
180 | } | |
181 | ||
182 | static | |
183 | int apply_field_reloc(struct lttng_event *event, | |
184 | struct bytecode_runtime *runtime, | |
185 | uint32_t runtime_len, | |
186 | uint32_t reloc_offset, | |
3834b99f MD |
187 | const char *field_name, |
188 | enum filter_op filter_op) | |
07dfc1d0 MD |
189 | { |
190 | const struct lttng_event_desc *desc; | |
191 | const struct lttng_event_field *fields, *field = NULL; | |
192 | unsigned int nr_fields, i; | |
07dfc1d0 MD |
193 | struct load_op *op; |
194 | uint32_t field_offset = 0; | |
195 | ||
196 | dbg_printk("Apply field reloc: %u %s\n", reloc_offset, field_name); | |
197 | ||
198 | /* Lookup event by name */ | |
199 | desc = event->desc; | |
200 | if (!desc) | |
201 | return -EINVAL; | |
202 | fields = desc->fields; | |
203 | if (!fields) | |
204 | return -EINVAL; | |
205 | nr_fields = desc->nr_fields; | |
206 | for (i = 0; i < nr_fields; i++) { | |
207 | if (!strcmp(fields[i].name, field_name)) { | |
208 | field = &fields[i]; | |
209 | break; | |
210 | } | |
211 | /* compute field offset */ | |
212 | switch (fields[i].type.atype) { | |
213 | case atype_integer: | |
214 | case atype_enum: | |
215 | field_offset += sizeof(int64_t); | |
216 | break; | |
217 | case atype_array: | |
218 | case atype_sequence: | |
3834b99f MD |
219 | case atype_array_bitfield: |
220 | case atype_sequence_bitfield: | |
07dfc1d0 MD |
221 | field_offset += sizeof(unsigned long); |
222 | field_offset += sizeof(void *); | |
223 | break; | |
224 | case atype_string: | |
225 | field_offset += sizeof(void *); | |
226 | break; | |
f513b2bf MD |
227 | case atype_struct: /* Unsupported. */ |
228 | case atype_array_compound: /* Unsupported. */ | |
229 | case atype_sequence_compound: /* Unsupported. */ | |
65c85aa6 | 230 | case atype_variant: /* Unsupported. */ |
07dfc1d0 MD |
231 | default: |
232 | return -EINVAL; | |
233 | } | |
234 | } | |
235 | if (!field) | |
236 | return -EINVAL; | |
237 | ||
238 | /* Check if field offset is too large for 16-bit offset */ | |
f127e61e | 239 | if (field_offset > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
240 | return -EINVAL; |
241 | ||
242 | /* set type */ | |
3834b99f MD |
243 | op = (struct load_op *) &runtime->code[reloc_offset]; |
244 | ||
245 | switch (filter_op) { | |
246 | case FILTER_OP_LOAD_FIELD_REF: | |
247 | { | |
248 | struct field_ref *field_ref; | |
249 | ||
250 | field_ref = (struct field_ref *) op->data; | |
251 | switch (field->type.atype) { | |
252 | case atype_integer: | |
253 | case atype_enum: | |
254 | op->op = FILTER_OP_LOAD_FIELD_REF_S64; | |
255 | break; | |
256 | case atype_array: | |
257 | case atype_sequence: | |
258 | if (field->user) | |
259 | op->op = FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE; | |
260 | else | |
261 | op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE; | |
262 | break; | |
263 | case atype_string: | |
264 | if (field->user) | |
265 | op->op = FILTER_OP_LOAD_FIELD_REF_USER_STRING; | |
266 | else | |
267 | op->op = FILTER_OP_LOAD_FIELD_REF_STRING; | |
268 | break; | |
269 | case atype_struct: /* Unsupported. */ | |
270 | case atype_array_compound: /* Unsupported. */ | |
271 | case atype_sequence_compound: /* Unsupported. */ | |
272 | case atype_variant: /* Unsupported. */ | |
273 | case atype_array_bitfield: /* Unsupported. */ | |
274 | case atype_sequence_bitfield: /* Unsupported. */ | |
275 | default: | |
276 | return -EINVAL; | |
277 | } | |
278 | /* set offset */ | |
279 | field_ref->offset = (uint16_t) field_offset; | |
07dfc1d0 | 280 | break; |
3834b99f | 281 | } |
07dfc1d0 MD |
282 | default: |
283 | return -EINVAL; | |
284 | } | |
07dfc1d0 MD |
285 | return 0; |
286 | } | |
287 | ||
288 | static | |
289 | int apply_context_reloc(struct lttng_event *event, | |
290 | struct bytecode_runtime *runtime, | |
291 | uint32_t runtime_len, | |
292 | uint32_t reloc_offset, | |
3834b99f MD |
293 | const char *context_name, |
294 | enum filter_op filter_op) | |
07dfc1d0 | 295 | { |
07dfc1d0 MD |
296 | struct load_op *op; |
297 | struct lttng_ctx_field *ctx_field; | |
298 | int idx; | |
299 | ||
300 | dbg_printk("Apply context reloc: %u %s\n", reloc_offset, context_name); | |
301 | ||
302 | /* Get context index */ | |
303 | idx = lttng_get_context_index(lttng_static_ctx, context_name); | |
304 | if (idx < 0) | |
305 | return -ENOENT; | |
306 | ||
307 | /* Check if idx is too large for 16-bit offset */ | |
f127e61e | 308 | if (idx > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
309 | return -EINVAL; |
310 | ||
311 | /* Get context return type */ | |
312 | ctx_field = <tng_static_ctx->fields[idx]; | |
3834b99f MD |
313 | op = (struct load_op *) &runtime->code[reloc_offset]; |
314 | ||
315 | switch (filter_op) { | |
316 | case FILTER_OP_GET_CONTEXT_REF: | |
317 | { | |
318 | struct field_ref *field_ref; | |
319 | ||
320 | field_ref = (struct field_ref *) op->data; | |
321 | switch (ctx_field->event_field.type.atype) { | |
322 | case atype_integer: | |
323 | case atype_enum: | |
324 | op->op = FILTER_OP_GET_CONTEXT_REF_S64; | |
325 | break; | |
326 | /* Sequence and array supported as string */ | |
327 | case atype_string: | |
328 | case atype_array: | |
329 | case atype_sequence: | |
330 | BUG_ON(ctx_field->event_field.user); | |
331 | op->op = FILTER_OP_GET_CONTEXT_REF_STRING; | |
332 | break; | |
333 | case atype_struct: /* Unsupported. */ | |
334 | case atype_array_compound: /* Unsupported. */ | |
335 | case atype_sequence_compound: /* Unsupported. */ | |
336 | case atype_variant: /* Unsupported. */ | |
337 | case atype_array_bitfield: /* Unsupported. */ | |
338 | case atype_sequence_bitfield: /* Unsupported. */ | |
339 | default: | |
340 | return -EINVAL; | |
341 | } | |
342 | /* set offset to context index within channel contexts */ | |
343 | field_ref->offset = (uint16_t) idx; | |
07dfc1d0 | 344 | break; |
3834b99f | 345 | } |
07dfc1d0 MD |
346 | default: |
347 | return -EINVAL; | |
348 | } | |
07dfc1d0 MD |
349 | return 0; |
350 | } | |
351 | ||
352 | static | |
353 | int apply_reloc(struct lttng_event *event, | |
354 | struct bytecode_runtime *runtime, | |
355 | uint32_t runtime_len, | |
356 | uint32_t reloc_offset, | |
357 | const char *name) | |
358 | { | |
359 | struct load_op *op; | |
360 | ||
361 | dbg_printk("Apply reloc: %u %s\n", reloc_offset, name); | |
362 | ||
363 | /* Ensure that the reloc is within the code */ | |
364 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
365 | return -EINVAL; | |
366 | ||
3834b99f | 367 | op = (struct load_op *) &runtime->code[reloc_offset]; |
07dfc1d0 MD |
368 | switch (op->op) { |
369 | case FILTER_OP_LOAD_FIELD_REF: | |
370 | return apply_field_reloc(event, runtime, runtime_len, | |
3834b99f | 371 | reloc_offset, name, op->op); |
07dfc1d0 MD |
372 | case FILTER_OP_GET_CONTEXT_REF: |
373 | return apply_context_reloc(event, runtime, runtime_len, | |
3834b99f MD |
374 | reloc_offset, name, op->op); |
375 | case FILTER_OP_GET_SYMBOL: | |
376 | case FILTER_OP_GET_SYMBOL_FIELD: | |
377 | /* | |
378 | * Will be handled by load specialize phase or | |
379 | * dynamically by interpreter. | |
380 | */ | |
381 | return 0; | |
07dfc1d0 MD |
382 | default: |
383 | printk(KERN_WARNING "Unknown reloc op type %u\n", op->op); | |
384 | return -EINVAL; | |
385 | } | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static | |
390 | int bytecode_is_linked(struct lttng_filter_bytecode_node *filter_bytecode, | |
391 | struct lttng_event *event) | |
392 | { | |
393 | struct lttng_bytecode_runtime *bc_runtime; | |
394 | ||
395 | list_for_each_entry(bc_runtime, | |
396 | &event->bytecode_runtime_head, node) { | |
397 | if (bc_runtime->bc == filter_bytecode) | |
398 | return 1; | |
399 | } | |
400 | return 0; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Take a bytecode with reloc table and link it to an event to create a | |
405 | * bytecode runtime. | |
406 | */ | |
407 | static | |
408 | int _lttng_filter_event_link_bytecode(struct lttng_event *event, | |
409 | struct lttng_filter_bytecode_node *filter_bytecode, | |
410 | struct list_head *insert_loc) | |
411 | { | |
412 | int ret, offset, next_offset; | |
413 | struct bytecode_runtime *runtime = NULL; | |
414 | size_t runtime_alloc_len; | |
415 | ||
416 | if (!filter_bytecode) | |
417 | return 0; | |
418 | /* Bytecode already linked */ | |
419 | if (bytecode_is_linked(filter_bytecode, event)) | |
420 | return 0; | |
421 | ||
422 | dbg_printk("Linking...\n"); | |
423 | ||
424 | /* We don't need the reloc table in the runtime */ | |
425 | runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset; | |
426 | runtime = kzalloc(runtime_alloc_len, GFP_KERNEL); | |
427 | if (!runtime) { | |
428 | ret = -ENOMEM; | |
429 | goto alloc_error; | |
430 | } | |
431 | runtime->p.bc = filter_bytecode; | |
3834b99f | 432 | runtime->p.event = event; |
07dfc1d0 MD |
433 | runtime->len = filter_bytecode->bc.reloc_offset; |
434 | /* copy original bytecode */ | |
3834b99f | 435 | memcpy(runtime->code, filter_bytecode->bc.data, runtime->len); |
07dfc1d0 MD |
436 | /* |
437 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
438 | * followed by a string (field name). | |
439 | */ | |
440 | for (offset = filter_bytecode->bc.reloc_offset; | |
441 | offset < filter_bytecode->bc.len; | |
442 | offset = next_offset) { | |
443 | uint16_t reloc_offset = | |
444 | *(uint16_t *) &filter_bytecode->bc.data[offset]; | |
445 | const char *name = | |
446 | (const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)]; | |
447 | ||
448 | ret = apply_reloc(event, runtime, runtime->len, reloc_offset, name); | |
449 | if (ret) { | |
450 | goto link_error; | |
451 | } | |
452 | next_offset = offset + sizeof(uint16_t) + strlen(name) + 1; | |
453 | } | |
454 | /* Validate bytecode */ | |
455 | ret = lttng_filter_validate_bytecode(runtime); | |
456 | if (ret) { | |
457 | goto link_error; | |
458 | } | |
459 | /* Specialize bytecode */ | |
3834b99f | 460 | ret = lttng_filter_specialize_bytecode(event, runtime); |
07dfc1d0 MD |
461 | if (ret) { |
462 | goto link_error; | |
463 | } | |
464 | runtime->p.filter = lttng_filter_interpret_bytecode; | |
465 | runtime->p.link_failed = 0; | |
466 | list_add_rcu(&runtime->p.node, insert_loc); | |
467 | dbg_printk("Linking successful.\n"); | |
468 | return 0; | |
469 | ||
470 | link_error: | |
471 | runtime->p.filter = lttng_filter_false; | |
472 | runtime->p.link_failed = 1; | |
473 | list_add_rcu(&runtime->p.node, insert_loc); | |
474 | alloc_error: | |
475 | dbg_printk("Linking failed.\n"); | |
476 | return ret; | |
477 | } | |
478 | ||
479 | void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime) | |
480 | { | |
481 | struct lttng_filter_bytecode_node *bc = runtime->bc; | |
482 | ||
483 | if (!bc->enabler->enabled || runtime->link_failed) | |
484 | runtime->filter = lttng_filter_false; | |
485 | else | |
486 | runtime->filter = lttng_filter_interpret_bytecode; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Link bytecode for all enablers referenced by an event. | |
491 | */ | |
492 | void lttng_enabler_event_link_bytecode(struct lttng_event *event, | |
493 | struct lttng_enabler *enabler) | |
494 | { | |
495 | struct lttng_filter_bytecode_node *bc; | |
496 | struct lttng_bytecode_runtime *runtime; | |
497 | ||
498 | /* Can only be called for events with desc attached */ | |
499 | WARN_ON_ONCE(!event->desc); | |
500 | ||
501 | /* Link each bytecode. */ | |
502 | list_for_each_entry(bc, &enabler->filter_bytecode_head, node) { | |
503 | int found = 0, ret; | |
504 | struct list_head *insert_loc; | |
505 | ||
506 | list_for_each_entry(runtime, | |
507 | &event->bytecode_runtime_head, node) { | |
508 | if (runtime->bc == bc) { | |
509 | found = 1; | |
510 | break; | |
511 | } | |
512 | } | |
513 | /* Skip bytecode already linked */ | |
514 | if (found) | |
515 | continue; | |
516 | ||
517 | /* | |
518 | * Insert at specified priority (seqnum) in increasing | |
519 | * order. | |
520 | */ | |
521 | list_for_each_entry_reverse(runtime, | |
522 | &event->bytecode_runtime_head, node) { | |
523 | if (runtime->bc->bc.seqnum < bc->bc.seqnum) { | |
524 | /* insert here */ | |
525 | insert_loc = &runtime->node; | |
526 | goto add_within; | |
527 | } | |
528 | } | |
529 | /* Add to head to list */ | |
530 | insert_loc = &event->bytecode_runtime_head; | |
531 | add_within: | |
532 | dbg_printk("linking bytecode\n"); | |
533 | ret = _lttng_filter_event_link_bytecode(event, bc, | |
534 | insert_loc); | |
535 | if (ret) { | |
536 | dbg_printk("[lttng filter] warning: cannot link event bytecode\n"); | |
537 | } | |
538 | } | |
539 | } | |
540 | ||
541 | /* | |
542 | * We own the filter_bytecode if we return success. | |
543 | */ | |
544 | int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler, | |
545 | struct lttng_filter_bytecode_node *filter_bytecode) | |
546 | { | |
547 | list_add(&filter_bytecode->node, &enabler->filter_bytecode_head); | |
548 | return 0; | |
549 | } | |
550 | ||
551 | void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler) | |
552 | { | |
553 | struct lttng_filter_bytecode_node *filter_bytecode, *tmp; | |
554 | ||
555 | list_for_each_entry_safe(filter_bytecode, tmp, | |
556 | &enabler->filter_bytecode_head, node) { | |
557 | kfree(filter_bytecode); | |
558 | } | |
559 | } | |
560 | ||
561 | void lttng_free_event_filter_runtime(struct lttng_event *event) | |
562 | { | |
563 | struct bytecode_runtime *runtime, *tmp; | |
564 | ||
565 | list_for_each_entry_safe(runtime, tmp, | |
566 | &event->bytecode_runtime_head, p.node) { | |
3834b99f | 567 | kfree(runtime->data); |
07dfc1d0 MD |
568 | kfree(runtime); |
569 | } | |
570 | } |