Commit | Line | Data |
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9f36eaed MJ |
1 | /* SPDX-License-Identifier: MIT |
2 | * | |
07dfc1d0 MD |
3 | * lttng-filter.c |
4 | * | |
5 | * LTTng modules filter code. | |
6 | * | |
bbf3aef5 | 7 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
07dfc1d0 MD |
8 | */ |
9 | ||
10 | #include <linux/list.h> | |
11 | #include <linux/slab.h> | |
12 | ||
241ae9a8 | 13 | #include <lttng-filter.h> |
07dfc1d0 MD |
14 | |
15 | static const char *opnames[] = { | |
16 | [ FILTER_OP_UNKNOWN ] = "UNKNOWN", | |
17 | ||
18 | [ FILTER_OP_RETURN ] = "RETURN", | |
19 | ||
20 | /* binary */ | |
21 | [ FILTER_OP_MUL ] = "MUL", | |
22 | [ FILTER_OP_DIV ] = "DIV", | |
23 | [ FILTER_OP_MOD ] = "MOD", | |
24 | [ FILTER_OP_PLUS ] = "PLUS", | |
25 | [ FILTER_OP_MINUS ] = "MINUS", | |
e16c054b MD |
26 | [ FILTER_OP_BIT_RSHIFT ] = "BIT_RSHIFT", |
27 | [ FILTER_OP_BIT_LSHIFT ] = "BIT_LSHIFT", | |
3834b99f MD |
28 | [ FILTER_OP_BIT_AND ] = "BIT_AND", |
29 | [ FILTER_OP_BIT_OR ] = "BIT_OR", | |
30 | [ FILTER_OP_BIT_XOR ] = "BIT_XOR", | |
07dfc1d0 MD |
31 | |
32 | /* binary comparators */ | |
33 | [ FILTER_OP_EQ ] = "EQ", | |
34 | [ FILTER_OP_NE ] = "NE", | |
35 | [ FILTER_OP_GT ] = "GT", | |
36 | [ FILTER_OP_LT ] = "LT", | |
37 | [ FILTER_OP_GE ] = "GE", | |
38 | [ FILTER_OP_LE ] = "LE", | |
39 | ||
40 | /* string binary comparators */ | |
41 | [ FILTER_OP_EQ_STRING ] = "EQ_STRING", | |
42 | [ FILTER_OP_NE_STRING ] = "NE_STRING", | |
43 | [ FILTER_OP_GT_STRING ] = "GT_STRING", | |
44 | [ FILTER_OP_LT_STRING ] = "LT_STRING", | |
45 | [ FILTER_OP_GE_STRING ] = "GE_STRING", | |
46 | [ FILTER_OP_LE_STRING ] = "LE_STRING", | |
47 | ||
48 | /* s64 binary comparators */ | |
49 | [ FILTER_OP_EQ_S64 ] = "EQ_S64", | |
50 | [ FILTER_OP_NE_S64 ] = "NE_S64", | |
51 | [ FILTER_OP_GT_S64 ] = "GT_S64", | |
52 | [ FILTER_OP_LT_S64 ] = "LT_S64", | |
53 | [ FILTER_OP_GE_S64 ] = "GE_S64", | |
54 | [ FILTER_OP_LE_S64 ] = "LE_S64", | |
55 | ||
56 | /* double binary comparators */ | |
57 | [ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE", | |
58 | [ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE", | |
59 | [ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE", | |
60 | [ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE", | |
61 | [ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE", | |
62 | [ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE", | |
63 | ||
64 | /* Mixed S64-double binary comparators */ | |
65 | [ FILTER_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64", | |
66 | [ FILTER_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64", | |
67 | [ FILTER_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64", | |
68 | [ FILTER_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64", | |
69 | [ FILTER_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64", | |
70 | [ FILTER_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64", | |
71 | ||
72 | [ FILTER_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE", | |
73 | [ FILTER_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE", | |
74 | [ FILTER_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE", | |
75 | [ FILTER_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE", | |
76 | [ FILTER_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE", | |
77 | [ FILTER_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE", | |
78 | ||
79 | /* unary */ | |
80 | [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS", | |
81 | [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS", | |
82 | [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT", | |
83 | [ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64", | |
84 | [ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64", | |
85 | [ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64", | |
86 | [ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE", | |
87 | [ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE", | |
88 | [ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE", | |
89 | ||
90 | /* logical */ | |
91 | [ FILTER_OP_AND ] = "AND", | |
92 | [ FILTER_OP_OR ] = "OR", | |
93 | ||
94 | /* load field ref */ | |
95 | [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF", | |
96 | [ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING", | |
97 | [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE", | |
98 | [ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64", | |
99 | [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE", | |
100 | ||
101 | /* load from immediate operand */ | |
102 | [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING", | |
103 | [ FILTER_OP_LOAD_S64 ] = "LOAD_S64", | |
104 | [ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", | |
105 | ||
106 | /* cast */ | |
107 | [ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64", | |
108 | [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64", | |
109 | [ FILTER_OP_CAST_NOP ] = "CAST_NOP", | |
110 | ||
111 | /* get context ref */ | |
112 | [ FILTER_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF", | |
113 | [ FILTER_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING", | |
114 | [ FILTER_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64", | |
115 | [ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE", | |
f127e61e MD |
116 | |
117 | /* load userspace field ref */ | |
118 | [ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING", | |
119 | [ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = "LOAD_FIELD_REF_USER_SEQUENCE", | |
83fb57ab MD |
120 | |
121 | /* | |
122 | * load immediate star globbing pattern (literal string) | |
123 | * from immediate. | |
124 | */ | |
125 | [ FILTER_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING", | |
126 | ||
127 | /* globbing pattern binary operator: apply to */ | |
128 | [ FILTER_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING", | |
129 | [ FILTER_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING", | |
3834b99f MD |
130 | |
131 | /* | |
132 | * Instructions for recursive traversal through composed types. | |
133 | */ | |
134 | [ FILTER_OP_GET_CONTEXT_ROOT ] = "GET_CONTEXT_ROOT", | |
135 | [ FILTER_OP_GET_APP_CONTEXT_ROOT ] = "GET_APP_CONTEXT_ROOT", | |
136 | [ FILTER_OP_GET_PAYLOAD_ROOT ] = "GET_PAYLOAD_ROOT", | |
137 | ||
138 | [ FILTER_OP_GET_SYMBOL ] = "GET_SYMBOL", | |
139 | [ FILTER_OP_GET_SYMBOL_FIELD ] = "GET_SYMBOL_FIELD", | |
140 | [ FILTER_OP_GET_INDEX_U16 ] = "GET_INDEX_U16", | |
141 | [ FILTER_OP_GET_INDEX_U64 ] = "GET_INDEX_U64", | |
142 | ||
143 | [ FILTER_OP_LOAD_FIELD ] = "LOAD_FIELD", | |
144 | [ FILTER_OP_LOAD_FIELD_S8 ] = "LOAD_FIELD_S8", | |
145 | [ FILTER_OP_LOAD_FIELD_S16 ] = "LOAD_FIELD_S16", | |
146 | [ FILTER_OP_LOAD_FIELD_S32 ] = "LOAD_FIELD_S32", | |
147 | [ FILTER_OP_LOAD_FIELD_S64 ] = "LOAD_FIELD_S64", | |
148 | [ FILTER_OP_LOAD_FIELD_U8 ] = "LOAD_FIELD_U8", | |
149 | [ FILTER_OP_LOAD_FIELD_U16 ] = "LOAD_FIELD_U16", | |
150 | [ FILTER_OP_LOAD_FIELD_U32 ] = "LOAD_FIELD_U32", | |
151 | [ FILTER_OP_LOAD_FIELD_U64 ] = "LOAD_FIELD_U64", | |
152 | [ FILTER_OP_LOAD_FIELD_STRING ] = "LOAD_FIELD_STRING", | |
153 | [ FILTER_OP_LOAD_FIELD_SEQUENCE ] = "LOAD_FIELD_SEQUENCE", | |
154 | [ FILTER_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE", | |
e16c054b MD |
155 | |
156 | [ FILTER_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT", | |
57ba4b41 MD |
157 | |
158 | [ FILTER_OP_RETURN_S64 ] = "RETURN_S64", | |
07dfc1d0 MD |
159 | }; |
160 | ||
161 | const char *lttng_filter_print_op(enum filter_op op) | |
162 | { | |
163 | if (op >= NR_FILTER_OPS) | |
164 | return "UNKNOWN"; | |
165 | else | |
166 | return opnames[op]; | |
167 | } | |
168 | ||
169 | static | |
170 | int apply_field_reloc(struct lttng_event *event, | |
171 | struct bytecode_runtime *runtime, | |
172 | uint32_t runtime_len, | |
173 | uint32_t reloc_offset, | |
3834b99f MD |
174 | const char *field_name, |
175 | enum filter_op filter_op) | |
07dfc1d0 MD |
176 | { |
177 | const struct lttng_event_desc *desc; | |
178 | const struct lttng_event_field *fields, *field = NULL; | |
179 | unsigned int nr_fields, i; | |
07dfc1d0 MD |
180 | struct load_op *op; |
181 | uint32_t field_offset = 0; | |
182 | ||
183 | dbg_printk("Apply field reloc: %u %s\n", reloc_offset, field_name); | |
184 | ||
185 | /* Lookup event by name */ | |
186 | desc = event->desc; | |
187 | if (!desc) | |
188 | return -EINVAL; | |
189 | fields = desc->fields; | |
190 | if (!fields) | |
191 | return -EINVAL; | |
192 | nr_fields = desc->nr_fields; | |
193 | for (i = 0; i < nr_fields; i++) { | |
194 | if (!strcmp(fields[i].name, field_name)) { | |
195 | field = &fields[i]; | |
196 | break; | |
197 | } | |
198 | /* compute field offset */ | |
199 | switch (fields[i].type.atype) { | |
200 | case atype_integer: | |
201 | case atype_enum: | |
202 | field_offset += sizeof(int64_t); | |
203 | break; | |
204 | case atype_array: | |
205 | case atype_sequence: | |
3834b99f MD |
206 | case atype_array_bitfield: |
207 | case atype_sequence_bitfield: | |
07dfc1d0 MD |
208 | field_offset += sizeof(unsigned long); |
209 | field_offset += sizeof(void *); | |
210 | break; | |
211 | case atype_string: | |
212 | field_offset += sizeof(void *); | |
213 | break; | |
f513b2bf MD |
214 | case atype_struct: /* Unsupported. */ |
215 | case atype_array_compound: /* Unsupported. */ | |
216 | case atype_sequence_compound: /* Unsupported. */ | |
65c85aa6 | 217 | case atype_variant: /* Unsupported. */ |
07dfc1d0 MD |
218 | default: |
219 | return -EINVAL; | |
220 | } | |
221 | } | |
222 | if (!field) | |
223 | return -EINVAL; | |
224 | ||
225 | /* Check if field offset is too large for 16-bit offset */ | |
f127e61e | 226 | if (field_offset > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
227 | return -EINVAL; |
228 | ||
229 | /* set type */ | |
3834b99f MD |
230 | op = (struct load_op *) &runtime->code[reloc_offset]; |
231 | ||
232 | switch (filter_op) { | |
233 | case FILTER_OP_LOAD_FIELD_REF: | |
234 | { | |
235 | struct field_ref *field_ref; | |
236 | ||
237 | field_ref = (struct field_ref *) op->data; | |
238 | switch (field->type.atype) { | |
239 | case atype_integer: | |
240 | case atype_enum: | |
241 | op->op = FILTER_OP_LOAD_FIELD_REF_S64; | |
242 | break; | |
243 | case atype_array: | |
244 | case atype_sequence: | |
245 | if (field->user) | |
246 | op->op = FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE; | |
247 | else | |
248 | op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE; | |
249 | break; | |
250 | case atype_string: | |
251 | if (field->user) | |
252 | op->op = FILTER_OP_LOAD_FIELD_REF_USER_STRING; | |
253 | else | |
254 | op->op = FILTER_OP_LOAD_FIELD_REF_STRING; | |
255 | break; | |
256 | case atype_struct: /* Unsupported. */ | |
257 | case atype_array_compound: /* Unsupported. */ | |
258 | case atype_sequence_compound: /* Unsupported. */ | |
259 | case atype_variant: /* Unsupported. */ | |
260 | case atype_array_bitfield: /* Unsupported. */ | |
261 | case atype_sequence_bitfield: /* Unsupported. */ | |
262 | default: | |
263 | return -EINVAL; | |
264 | } | |
265 | /* set offset */ | |
266 | field_ref->offset = (uint16_t) field_offset; | |
07dfc1d0 | 267 | break; |
3834b99f | 268 | } |
07dfc1d0 MD |
269 | default: |
270 | return -EINVAL; | |
271 | } | |
07dfc1d0 MD |
272 | return 0; |
273 | } | |
274 | ||
275 | static | |
276 | int apply_context_reloc(struct lttng_event *event, | |
277 | struct bytecode_runtime *runtime, | |
278 | uint32_t runtime_len, | |
279 | uint32_t reloc_offset, | |
3834b99f MD |
280 | const char *context_name, |
281 | enum filter_op filter_op) | |
07dfc1d0 | 282 | { |
07dfc1d0 MD |
283 | struct load_op *op; |
284 | struct lttng_ctx_field *ctx_field; | |
285 | int idx; | |
286 | ||
287 | dbg_printk("Apply context reloc: %u %s\n", reloc_offset, context_name); | |
288 | ||
289 | /* Get context index */ | |
290 | idx = lttng_get_context_index(lttng_static_ctx, context_name); | |
291 | if (idx < 0) | |
292 | return -ENOENT; | |
293 | ||
294 | /* Check if idx is too large for 16-bit offset */ | |
f127e61e | 295 | if (idx > LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
296 | return -EINVAL; |
297 | ||
298 | /* Get context return type */ | |
299 | ctx_field = <tng_static_ctx->fields[idx]; | |
3834b99f MD |
300 | op = (struct load_op *) &runtime->code[reloc_offset]; |
301 | ||
302 | switch (filter_op) { | |
303 | case FILTER_OP_GET_CONTEXT_REF: | |
304 | { | |
305 | struct field_ref *field_ref; | |
306 | ||
307 | field_ref = (struct field_ref *) op->data; | |
308 | switch (ctx_field->event_field.type.atype) { | |
309 | case atype_integer: | |
310 | case atype_enum: | |
311 | op->op = FILTER_OP_GET_CONTEXT_REF_S64; | |
312 | break; | |
313 | /* Sequence and array supported as string */ | |
314 | case atype_string: | |
315 | case atype_array: | |
316 | case atype_sequence: | |
317 | BUG_ON(ctx_field->event_field.user); | |
318 | op->op = FILTER_OP_GET_CONTEXT_REF_STRING; | |
319 | break; | |
320 | case atype_struct: /* Unsupported. */ | |
321 | case atype_array_compound: /* Unsupported. */ | |
322 | case atype_sequence_compound: /* Unsupported. */ | |
323 | case atype_variant: /* Unsupported. */ | |
324 | case atype_array_bitfield: /* Unsupported. */ | |
325 | case atype_sequence_bitfield: /* Unsupported. */ | |
326 | default: | |
327 | return -EINVAL; | |
328 | } | |
329 | /* set offset to context index within channel contexts */ | |
330 | field_ref->offset = (uint16_t) idx; | |
07dfc1d0 | 331 | break; |
3834b99f | 332 | } |
07dfc1d0 MD |
333 | default: |
334 | return -EINVAL; | |
335 | } | |
07dfc1d0 MD |
336 | return 0; |
337 | } | |
338 | ||
339 | static | |
340 | int apply_reloc(struct lttng_event *event, | |
341 | struct bytecode_runtime *runtime, | |
342 | uint32_t runtime_len, | |
343 | uint32_t reloc_offset, | |
344 | const char *name) | |
345 | { | |
346 | struct load_op *op; | |
347 | ||
348 | dbg_printk("Apply reloc: %u %s\n", reloc_offset, name); | |
349 | ||
350 | /* Ensure that the reloc is within the code */ | |
351 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
352 | return -EINVAL; | |
353 | ||
3834b99f | 354 | op = (struct load_op *) &runtime->code[reloc_offset]; |
07dfc1d0 MD |
355 | switch (op->op) { |
356 | case FILTER_OP_LOAD_FIELD_REF: | |
357 | return apply_field_reloc(event, runtime, runtime_len, | |
3834b99f | 358 | reloc_offset, name, op->op); |
07dfc1d0 MD |
359 | case FILTER_OP_GET_CONTEXT_REF: |
360 | return apply_context_reloc(event, runtime, runtime_len, | |
3834b99f MD |
361 | reloc_offset, name, op->op); |
362 | case FILTER_OP_GET_SYMBOL: | |
363 | case FILTER_OP_GET_SYMBOL_FIELD: | |
364 | /* | |
365 | * Will be handled by load specialize phase or | |
366 | * dynamically by interpreter. | |
367 | */ | |
368 | return 0; | |
07dfc1d0 MD |
369 | default: |
370 | printk(KERN_WARNING "Unknown reloc op type %u\n", op->op); | |
371 | return -EINVAL; | |
372 | } | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static | |
377 | int bytecode_is_linked(struct lttng_filter_bytecode_node *filter_bytecode, | |
378 | struct lttng_event *event) | |
379 | { | |
380 | struct lttng_bytecode_runtime *bc_runtime; | |
381 | ||
382 | list_for_each_entry(bc_runtime, | |
383 | &event->bytecode_runtime_head, node) { | |
384 | if (bc_runtime->bc == filter_bytecode) | |
385 | return 1; | |
386 | } | |
387 | return 0; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Take a bytecode with reloc table and link it to an event to create a | |
392 | * bytecode runtime. | |
393 | */ | |
394 | static | |
395 | int _lttng_filter_event_link_bytecode(struct lttng_event *event, | |
396 | struct lttng_filter_bytecode_node *filter_bytecode, | |
397 | struct list_head *insert_loc) | |
398 | { | |
399 | int ret, offset, next_offset; | |
400 | struct bytecode_runtime *runtime = NULL; | |
401 | size_t runtime_alloc_len; | |
402 | ||
403 | if (!filter_bytecode) | |
404 | return 0; | |
405 | /* Bytecode already linked */ | |
406 | if (bytecode_is_linked(filter_bytecode, event)) | |
407 | return 0; | |
408 | ||
409 | dbg_printk("Linking...\n"); | |
410 | ||
411 | /* We don't need the reloc table in the runtime */ | |
412 | runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset; | |
413 | runtime = kzalloc(runtime_alloc_len, GFP_KERNEL); | |
414 | if (!runtime) { | |
415 | ret = -ENOMEM; | |
416 | goto alloc_error; | |
417 | } | |
418 | runtime->p.bc = filter_bytecode; | |
3834b99f | 419 | runtime->p.event = event; |
07dfc1d0 MD |
420 | runtime->len = filter_bytecode->bc.reloc_offset; |
421 | /* copy original bytecode */ | |
3834b99f | 422 | memcpy(runtime->code, filter_bytecode->bc.data, runtime->len); |
07dfc1d0 MD |
423 | /* |
424 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
425 | * followed by a string (field name). | |
426 | */ | |
427 | for (offset = filter_bytecode->bc.reloc_offset; | |
428 | offset < filter_bytecode->bc.len; | |
429 | offset = next_offset) { | |
430 | uint16_t reloc_offset = | |
431 | *(uint16_t *) &filter_bytecode->bc.data[offset]; | |
432 | const char *name = | |
433 | (const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)]; | |
434 | ||
435 | ret = apply_reloc(event, runtime, runtime->len, reloc_offset, name); | |
436 | if (ret) { | |
437 | goto link_error; | |
438 | } | |
439 | next_offset = offset + sizeof(uint16_t) + strlen(name) + 1; | |
440 | } | |
441 | /* Validate bytecode */ | |
442 | ret = lttng_filter_validate_bytecode(runtime); | |
443 | if (ret) { | |
444 | goto link_error; | |
445 | } | |
446 | /* Specialize bytecode */ | |
3834b99f | 447 | ret = lttng_filter_specialize_bytecode(event, runtime); |
07dfc1d0 MD |
448 | if (ret) { |
449 | goto link_error; | |
450 | } | |
451 | runtime->p.filter = lttng_filter_interpret_bytecode; | |
452 | runtime->p.link_failed = 0; | |
453 | list_add_rcu(&runtime->p.node, insert_loc); | |
454 | dbg_printk("Linking successful.\n"); | |
455 | return 0; | |
456 | ||
457 | link_error: | |
458 | runtime->p.filter = lttng_filter_false; | |
459 | runtime->p.link_failed = 1; | |
460 | list_add_rcu(&runtime->p.node, insert_loc); | |
461 | alloc_error: | |
462 | dbg_printk("Linking failed.\n"); | |
463 | return ret; | |
464 | } | |
465 | ||
466 | void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime) | |
467 | { | |
468 | struct lttng_filter_bytecode_node *bc = runtime->bc; | |
469 | ||
470 | if (!bc->enabler->enabled || runtime->link_failed) | |
471 | runtime->filter = lttng_filter_false; | |
472 | else | |
473 | runtime->filter = lttng_filter_interpret_bytecode; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Link bytecode for all enablers referenced by an event. | |
478 | */ | |
479 | void lttng_enabler_event_link_bytecode(struct lttng_event *event, | |
480 | struct lttng_enabler *enabler) | |
481 | { | |
482 | struct lttng_filter_bytecode_node *bc; | |
483 | struct lttng_bytecode_runtime *runtime; | |
484 | ||
485 | /* Can only be called for events with desc attached */ | |
486 | WARN_ON_ONCE(!event->desc); | |
487 | ||
488 | /* Link each bytecode. */ | |
489 | list_for_each_entry(bc, &enabler->filter_bytecode_head, node) { | |
490 | int found = 0, ret; | |
491 | struct list_head *insert_loc; | |
492 | ||
493 | list_for_each_entry(runtime, | |
494 | &event->bytecode_runtime_head, node) { | |
495 | if (runtime->bc == bc) { | |
496 | found = 1; | |
497 | break; | |
498 | } | |
499 | } | |
500 | /* Skip bytecode already linked */ | |
501 | if (found) | |
502 | continue; | |
503 | ||
504 | /* | |
505 | * Insert at specified priority (seqnum) in increasing | |
506 | * order. | |
507 | */ | |
508 | list_for_each_entry_reverse(runtime, | |
509 | &event->bytecode_runtime_head, node) { | |
510 | if (runtime->bc->bc.seqnum < bc->bc.seqnum) { | |
511 | /* insert here */ | |
512 | insert_loc = &runtime->node; | |
513 | goto add_within; | |
514 | } | |
515 | } | |
516 | /* Add to head to list */ | |
517 | insert_loc = &event->bytecode_runtime_head; | |
518 | add_within: | |
519 | dbg_printk("linking bytecode\n"); | |
520 | ret = _lttng_filter_event_link_bytecode(event, bc, | |
521 | insert_loc); | |
522 | if (ret) { | |
523 | dbg_printk("[lttng filter] warning: cannot link event bytecode\n"); | |
524 | } | |
525 | } | |
526 | } | |
527 | ||
528 | /* | |
529 | * We own the filter_bytecode if we return success. | |
530 | */ | |
531 | int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler, | |
532 | struct lttng_filter_bytecode_node *filter_bytecode) | |
533 | { | |
534 | list_add(&filter_bytecode->node, &enabler->filter_bytecode_head); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler) | |
539 | { | |
540 | struct lttng_filter_bytecode_node *filter_bytecode, *tmp; | |
541 | ||
542 | list_for_each_entry_safe(filter_bytecode, tmp, | |
543 | &enabler->filter_bytecode_head, node) { | |
544 | kfree(filter_bytecode); | |
545 | } | |
546 | } | |
547 | ||
548 | void lttng_free_event_filter_runtime(struct lttng_event *event) | |
549 | { | |
550 | struct bytecode_runtime *runtime, *tmp; | |
551 | ||
552 | list_for_each_entry_safe(runtime, tmp, | |
553 | &event->bytecode_runtime_head, p.node) { | |
3834b99f | 554 | kfree(runtime->data); |
07dfc1d0 MD |
555 | kfree(runtime); |
556 | } | |
557 | } |