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1 | /* |
2 | * Copyright (c) 2008-2017 Nicira, Inc. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | #include "openvswitch/ofp-packet.h" | |
19 | #include <string.h> | |
20 | #include "dp-packet.h" | |
21 | #include "nx-match.h" | |
22 | #include "openvswitch/ofp-actions.h" | |
23 | #include "openvswitch/ofp-errors.h" | |
24 | #include "openvswitch/ofp-msgs.h" | |
25 | #include "openvswitch/ofp-parse.h" | |
26 | #include "openvswitch/ofp-port.h" | |
27 | #include "openvswitch/ofp-prop.h" | |
28 | #include "openvswitch/ofpbuf.h" | |
29 | #include "openvswitch/vlog.h" | |
30 | #include "util.h" | |
31 | #include "uuid.h" | |
32 | ||
33 | VLOG_DEFINE_THIS_MODULE(ofp_packet); | |
34 | ||
35 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); | |
36 | ||
37 | bool | |
38 | ofputil_packet_in_format_is_valid(enum nx_packet_in_format packet_in_format) | |
39 | { | |
40 | switch (packet_in_format) { | |
41 | case NXPIF_STANDARD: | |
42 | case NXPIF_NXT_PACKET_IN: | |
43 | case NXPIF_NXT_PACKET_IN2: | |
44 | return true; | |
45 | } | |
46 | ||
47 | return false; | |
48 | } | |
49 | ||
50 | const char * | |
51 | ofputil_packet_in_format_to_string(enum nx_packet_in_format packet_in_format) | |
52 | { | |
53 | switch (packet_in_format) { | |
54 | case NXPIF_STANDARD: | |
55 | return "standard"; | |
56 | case NXPIF_NXT_PACKET_IN: | |
57 | return "nxt_packet_in"; | |
58 | case NXPIF_NXT_PACKET_IN2: | |
59 | return "nxt_packet_in2"; | |
60 | default: | |
61 | OVS_NOT_REACHED(); | |
62 | } | |
63 | } | |
64 | ||
65 | int | |
66 | ofputil_packet_in_format_from_string(const char *s) | |
67 | { | |
68 | return (!strcmp(s, "standard") || !strcmp(s, "openflow10") | |
69 | ? NXPIF_STANDARD | |
70 | : !strcmp(s, "nxt_packet_in") || !strcmp(s, "nxm") | |
71 | ? NXPIF_NXT_PACKET_IN | |
72 | : !strcmp(s, "nxt_packet_in2") | |
73 | ? NXPIF_NXT_PACKET_IN2 | |
74 | : -1); | |
75 | } | |
76 | ||
77 | struct ofpbuf * | |
78 | ofputil_make_set_packet_in_format(enum ofp_version ofp_version, | |
79 | enum nx_packet_in_format packet_in_format) | |
80 | { | |
81 | struct nx_set_packet_in_format *spif; | |
82 | struct ofpbuf *msg; | |
83 | ||
84 | msg = ofpraw_alloc(OFPRAW_NXT_SET_PACKET_IN_FORMAT, ofp_version, 0); | |
85 | spif = ofpbuf_put_zeros(msg, sizeof *spif); | |
86 | spif->format = htonl(packet_in_format); | |
87 | ||
88 | return msg; | |
89 | } | |
90 | \f | |
91 | /* The caller has done basic initialization of '*pin'; the other output | |
92 | * arguments needs to be initialized. */ | |
93 | static enum ofperr | |
94 | decode_nx_packet_in2(const struct ofp_header *oh, bool loose, | |
95 | const struct tun_table *tun_table, | |
96 | const struct vl_mff_map *vl_mff_map, | |
97 | struct ofputil_packet_in *pin, | |
98 | size_t *total_len, uint32_t *buffer_id, | |
99 | struct ofpbuf *continuation) | |
100 | { | |
101 | *total_len = 0; | |
102 | *buffer_id = UINT32_MAX; | |
103 | ||
104 | struct ofpbuf properties; | |
105 | ofpbuf_use_const(&properties, oh, ntohs(oh->length)); | |
106 | ofpraw_pull_assert(&properties); | |
107 | ||
108 | while (properties.size > 0) { | |
109 | struct ofpbuf payload; | |
110 | uint64_t type; | |
111 | ||
112 | enum ofperr error = ofpprop_pull(&properties, &payload, &type); | |
113 | if (error) { | |
114 | return error; | |
115 | } | |
116 | ||
117 | switch (type) { | |
118 | case NXPINT_PACKET: | |
119 | pin->packet = payload.msg; | |
120 | pin->packet_len = ofpbuf_msgsize(&payload); | |
121 | break; | |
122 | ||
123 | case NXPINT_FULL_LEN: { | |
124 | uint32_t u32; | |
125 | error = ofpprop_parse_u32(&payload, &u32); | |
126 | *total_len = u32; | |
127 | break; | |
128 | } | |
129 | ||
130 | case NXPINT_BUFFER_ID: | |
131 | error = ofpprop_parse_u32(&payload, buffer_id); | |
132 | break; | |
133 | ||
134 | case NXPINT_TABLE_ID: | |
135 | error = ofpprop_parse_u8(&payload, &pin->table_id); | |
136 | break; | |
137 | ||
138 | case NXPINT_COOKIE: | |
139 | error = ofpprop_parse_be64(&payload, &pin->cookie); | |
140 | break; | |
141 | ||
142 | case NXPINT_REASON: { | |
143 | uint8_t reason; | |
144 | error = ofpprop_parse_u8(&payload, &reason); | |
145 | pin->reason = reason; | |
146 | break; | |
147 | } | |
148 | ||
149 | case NXPINT_METADATA: | |
150 | error = oxm_decode_match(payload.msg, ofpbuf_msgsize(&payload), | |
151 | loose, tun_table, vl_mff_map, | |
152 | &pin->flow_metadata); | |
153 | break; | |
154 | ||
155 | case NXPINT_USERDATA: | |
156 | pin->userdata = payload.msg; | |
157 | pin->userdata_len = ofpbuf_msgsize(&payload); | |
158 | break; | |
159 | ||
160 | case NXPINT_CONTINUATION: | |
161 | if (continuation) { | |
162 | error = ofpprop_parse_nested(&payload, continuation); | |
163 | } | |
164 | break; | |
165 | ||
166 | default: | |
167 | error = OFPPROP_UNKNOWN(loose, "NX_PACKET_IN2", type); | |
168 | break; | |
169 | } | |
170 | if (error) { | |
171 | return error; | |
172 | } | |
173 | } | |
174 | ||
175 | if (!pin->packet_len) { | |
176 | VLOG_WARN_RL(&rl, "NXT_PACKET_IN2 lacks packet"); | |
177 | return OFPERR_OFPBRC_BAD_LEN; | |
178 | } else if (!*total_len) { | |
179 | *total_len = pin->packet_len; | |
180 | } else if (*total_len < pin->packet_len) { | |
181 | VLOG_WARN_RL(&rl, "NXT_PACKET_IN2 claimed full_len < len"); | |
182 | return OFPERR_OFPBRC_BAD_LEN; | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | /* Decodes the packet-in message starting at 'oh' into '*pin'. Populates | |
189 | * 'pin->packet' and 'pin->packet_len' with the part of the packet actually | |
190 | * included in the message. If 'total_lenp' is nonnull, populates | |
191 | * '*total_lenp' with the original length of the packet (which is larger than | |
192 | * 'packet->len' if only part of the packet was included). If 'buffer_idp' is | |
193 | * nonnull, stores the packet's buffer ID in '*buffer_idp' (UINT32_MAX if it | |
194 | * was not buffered). | |
195 | * | |
196 | * Populates 'continuation', if nonnull, with the continuation data from the | |
197 | * packet-in (an empty buffer, if 'oh' did not contain continuation data). The | |
198 | * format of this data is supposed to be opaque to anything other than | |
199 | * ovs-vswitchd, so that in any other process the only reasonable use of this | |
200 | * data is to be copied into an NXT_RESUME message via ofputil_encode_resume(). | |
201 | * | |
202 | * This function points 'pin->packet' into 'oh', so the caller should not free | |
203 | * it separately from the original OpenFlow message. This is also true for | |
204 | * 'pin->userdata' (which could also end up NULL if there is no userdata). | |
205 | * | |
206 | * 'vl_mff_map' is an optional parameter that is used to validate the length | |
207 | * of variable length mf_fields in 'match'. If it is not provided, the | |
208 | * default mf_fields with maximum length will be used. | |
209 | * | |
210 | * Returns 0 if successful, otherwise an OpenFlow error code. */ | |
211 | enum ofperr | |
212 | ofputil_decode_packet_in(const struct ofp_header *oh, bool loose, | |
213 | const struct tun_table *tun_table, | |
214 | const struct vl_mff_map *vl_mff_map, | |
215 | struct ofputil_packet_in *pin, | |
216 | size_t *total_lenp, uint32_t *buffer_idp, | |
217 | struct ofpbuf *continuation) | |
218 | { | |
219 | uint32_t buffer_id; | |
220 | size_t total_len; | |
221 | ||
222 | memset(pin, 0, sizeof *pin); | |
223 | pin->cookie = OVS_BE64_MAX; | |
224 | if (continuation) { | |
225 | ofpbuf_use_const(continuation, NULL, 0); | |
226 | } | |
227 | ||
228 | struct ofpbuf b = ofpbuf_const_initializer(oh, ntohs(oh->length)); | |
229 | enum ofpraw raw = ofpraw_pull_assert(&b); | |
230 | if (raw == OFPRAW_OFPT13_PACKET_IN || raw == OFPRAW_OFPT12_PACKET_IN) { | |
231 | const struct ofp12_packet_in *opi = ofpbuf_pull(&b, sizeof *opi); | |
232 | const ovs_be64 *cookie = (raw == OFPRAW_OFPT13_PACKET_IN | |
233 | ? ofpbuf_pull(&b, sizeof *cookie) | |
234 | : NULL); | |
235 | enum ofperr error = oxm_pull_match_loose(&b, false, tun_table, | |
236 | &pin->flow_metadata); | |
237 | if (error) { | |
238 | return error; | |
239 | } | |
240 | ||
241 | if (!ofpbuf_try_pull(&b, 2)) { | |
242 | return OFPERR_OFPBRC_BAD_LEN; | |
243 | } | |
244 | ||
245 | pin->reason = opi->reason; | |
246 | pin->table_id = opi->table_id; | |
247 | buffer_id = ntohl(opi->buffer_id); | |
248 | total_len = ntohs(opi->total_len); | |
249 | if (cookie) { | |
250 | pin->cookie = *cookie; | |
251 | } | |
252 | ||
253 | pin->packet = b.data; | |
254 | pin->packet_len = b.size; | |
255 | } else if (raw == OFPRAW_OFPT10_PACKET_IN) { | |
256 | const struct ofp10_packet_in *opi; | |
257 | ||
258 | opi = ofpbuf_pull(&b, offsetof(struct ofp10_packet_in, data)); | |
259 | ||
260 | pin->packet = CONST_CAST(uint8_t *, opi->data); | |
261 | pin->packet_len = b.size; | |
262 | ||
263 | match_init_catchall(&pin->flow_metadata); | |
264 | match_set_in_port(&pin->flow_metadata, | |
265 | u16_to_ofp(ntohs(opi->in_port))); | |
266 | pin->reason = opi->reason; | |
267 | buffer_id = ntohl(opi->buffer_id); | |
268 | total_len = ntohs(opi->total_len); | |
269 | } else if (raw == OFPRAW_OFPT11_PACKET_IN) { | |
270 | const struct ofp11_packet_in *opi; | |
271 | ofp_port_t in_port; | |
272 | enum ofperr error; | |
273 | ||
274 | opi = ofpbuf_pull(&b, sizeof *opi); | |
275 | ||
276 | pin->packet = b.data; | |
277 | pin->packet_len = b.size; | |
278 | ||
279 | buffer_id = ntohl(opi->buffer_id); | |
280 | error = ofputil_port_from_ofp11(opi->in_port, &in_port); | |
281 | if (error) { | |
282 | return error; | |
283 | } | |
284 | match_init_catchall(&pin->flow_metadata); | |
285 | match_set_in_port(&pin->flow_metadata, in_port); | |
286 | total_len = ntohs(opi->total_len); | |
287 | pin->reason = opi->reason; | |
288 | pin->table_id = opi->table_id; | |
289 | } else if (raw == OFPRAW_NXT_PACKET_IN) { | |
290 | const struct nx_packet_in *npi; | |
291 | int error; | |
292 | ||
293 | npi = ofpbuf_pull(&b, sizeof *npi); | |
294 | error = nx_pull_match_loose(&b, ntohs(npi->match_len), | |
295 | &pin->flow_metadata, NULL, NULL, false, | |
296 | NULL); | |
297 | if (error) { | |
298 | return error; | |
299 | } | |
300 | ||
301 | if (!ofpbuf_try_pull(&b, 2)) { | |
302 | return OFPERR_OFPBRC_BAD_LEN; | |
303 | } | |
304 | ||
305 | pin->reason = npi->reason; | |
306 | pin->table_id = npi->table_id; | |
307 | pin->cookie = npi->cookie; | |
308 | ||
309 | buffer_id = ntohl(npi->buffer_id); | |
310 | total_len = ntohs(npi->total_len); | |
311 | ||
312 | pin->packet = b.data; | |
313 | pin->packet_len = b.size; | |
314 | } else if (raw == OFPRAW_NXT_PACKET_IN2 || raw == OFPRAW_NXT_RESUME) { | |
315 | enum ofperr error = decode_nx_packet_in2(oh, loose, tun_table, | |
316 | vl_mff_map, pin, &total_len, | |
317 | &buffer_id, continuation); | |
318 | if (error) { | |
319 | return error; | |
320 | } | |
321 | } else { | |
322 | OVS_NOT_REACHED(); | |
323 | } | |
324 | ||
325 | if (total_lenp) { | |
326 | *total_lenp = total_len; | |
327 | } | |
328 | if (buffer_idp) { | |
329 | *buffer_idp = buffer_id; | |
330 | } | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | static int | |
336 | encode_packet_in_reason(enum ofp_packet_in_reason reason, | |
337 | enum ofp_version version) | |
338 | { | |
339 | switch (reason) { | |
340 | case OFPR_NO_MATCH: | |
341 | case OFPR_ACTION: | |
342 | case OFPR_INVALID_TTL: | |
343 | return reason; | |
344 | ||
345 | case OFPR_ACTION_SET: | |
346 | case OFPR_GROUP: | |
347 | case OFPR_PACKET_OUT: | |
348 | return version < OFP14_VERSION ? OFPR_ACTION : reason; | |
349 | ||
350 | case OFPR_EXPLICIT_MISS: | |
351 | return version < OFP13_VERSION ? OFPR_ACTION : OFPR_NO_MATCH; | |
352 | ||
353 | case OFPR_IMPLICIT_MISS: | |
354 | return OFPR_NO_MATCH; | |
355 | ||
356 | case OFPR_N_REASONS: | |
357 | default: | |
358 | OVS_NOT_REACHED(); | |
359 | } | |
360 | } | |
361 | ||
362 | /* Only NXT_PACKET_IN2 (not NXT_RESUME) should include NXCPT_USERDATA, so this | |
363 | * function omits it. The caller can add it itself if desired. */ | |
364 | static void | |
365 | ofputil_put_packet_in(const struct ofputil_packet_in *pin, | |
366 | enum ofp_version version, size_t include_bytes, | |
367 | struct ofpbuf *msg) | |
368 | { | |
369 | /* Add packet properties. */ | |
370 | ofpprop_put(msg, NXPINT_PACKET, pin->packet, include_bytes); | |
371 | if (include_bytes != pin->packet_len) { | |
372 | ofpprop_put_u32(msg, NXPINT_FULL_LEN, pin->packet_len); | |
373 | } | |
374 | ||
375 | /* Add flow properties. */ | |
376 | ofpprop_put_u8(msg, NXPINT_TABLE_ID, pin->table_id); | |
377 | if (pin->cookie != OVS_BE64_MAX) { | |
378 | ofpprop_put_be64(msg, NXPINT_COOKIE, pin->cookie); | |
379 | } | |
380 | ||
381 | /* Add other properties. */ | |
382 | ofpprop_put_u8(msg, NXPINT_REASON, | |
383 | encode_packet_in_reason(pin->reason, version)); | |
384 | ||
385 | size_t start = ofpprop_start(msg, NXPINT_METADATA); | |
386 | oxm_put_raw(msg, &pin->flow_metadata, version); | |
387 | ofpprop_end(msg, start); | |
388 | } | |
389 | ||
390 | static void | |
391 | put_actions_property(struct ofpbuf *msg, uint64_t prop_type, | |
392 | enum ofp_version version, | |
393 | const struct ofpact *actions, size_t actions_len) | |
394 | { | |
395 | if (actions_len) { | |
396 | size_t start = ofpprop_start_nested(msg, prop_type); | |
397 | ofpacts_put_openflow_actions(actions, actions_len, msg, version); | |
398 | ofpprop_end(msg, start); | |
399 | } | |
400 | } | |
401 | ||
402 | enum nx_continuation_prop_type { | |
403 | NXCPT_BRIDGE = 0x8000, | |
404 | NXCPT_STACK, | |
405 | NXCPT_MIRRORS, | |
406 | NXCPT_CONNTRACKED, | |
407 | NXCPT_TABLE_ID, | |
408 | NXCPT_COOKIE, | |
409 | NXCPT_ACTIONS, | |
410 | NXCPT_ACTION_SET, | |
411 | }; | |
412 | ||
413 | /* Only NXT_PACKET_IN2 (not NXT_RESUME) should include NXCPT_USERDATA, so this | |
414 | * function omits it. The caller can add it itself if desired. */ | |
415 | static void | |
416 | ofputil_put_packet_in_private(const struct ofputil_packet_in_private *pin, | |
417 | enum ofp_version version, size_t include_bytes, | |
418 | struct ofpbuf *msg) | |
419 | { | |
420 | ofputil_put_packet_in(&pin->base, version, include_bytes, msg); | |
421 | ||
422 | size_t continuation_ofs = ofpprop_start_nested(msg, NXPINT_CONTINUATION); | |
423 | size_t inner_ofs = msg->size; | |
424 | ||
425 | if (!uuid_is_zero(&pin->bridge)) { | |
426 | ofpprop_put_uuid(msg, NXCPT_BRIDGE, &pin->bridge); | |
427 | } | |
428 | ||
429 | struct ofpbuf pin_stack; | |
430 | ofpbuf_use_const(&pin_stack, pin->stack, pin->stack_size); | |
431 | ||
432 | while (pin_stack.size) { | |
433 | uint8_t len; | |
434 | uint8_t *val = nx_stack_pop(&pin_stack, &len); | |
435 | ofpprop_put(msg, NXCPT_STACK, val, len); | |
436 | } | |
437 | ||
438 | if (pin->mirrors) { | |
439 | ofpprop_put_u32(msg, NXCPT_MIRRORS, pin->mirrors); | |
440 | } | |
441 | ||
442 | if (pin->conntracked) { | |
443 | ofpprop_put_flag(msg, NXCPT_CONNTRACKED); | |
444 | } | |
445 | ||
446 | if (pin->actions_len) { | |
447 | /* Divide 'pin->actions' into groups that begins with an | |
448 | * unroll_xlate action. For each group, emit a NXCPT_TABLE_ID and | |
449 | * NXCPT_COOKIE property (if either has changed; each is initially | |
450 | * assumed 0), then a NXCPT_ACTIONS property with the grouped | |
451 | * actions. | |
452 | * | |
453 | * The alternative is to make OFPACT_UNROLL_XLATE public. We can | |
454 | * always do that later, since this is a private property. */ | |
455 | const struct ofpact *const end = ofpact_end(pin->actions, | |
456 | pin->actions_len); | |
457 | const struct ofpact_unroll_xlate *unroll = NULL; | |
458 | uint8_t table_id = 0; | |
459 | ovs_be64 cookie = 0; | |
460 | ||
461 | const struct ofpact *a; | |
462 | for (a = pin->actions; ; a = ofpact_next(a)) { | |
463 | if (a == end || a->type == OFPACT_UNROLL_XLATE) { | |
464 | if (unroll) { | |
465 | if (table_id != unroll->rule_table_id) { | |
466 | ofpprop_put_u8(msg, NXCPT_TABLE_ID, | |
467 | unroll->rule_table_id); | |
468 | table_id = unroll->rule_table_id; | |
469 | } | |
470 | if (cookie != unroll->rule_cookie) { | |
471 | ofpprop_put_be64(msg, NXCPT_COOKIE, | |
472 | unroll->rule_cookie); | |
473 | cookie = unroll->rule_cookie; | |
474 | } | |
475 | } | |
476 | ||
477 | const struct ofpact *start | |
478 | = unroll ? ofpact_next(&unroll->ofpact) : pin->actions; | |
479 | put_actions_property(msg, NXCPT_ACTIONS, version, | |
480 | start, (a - start) * sizeof *a); | |
481 | ||
482 | if (a == end) { | |
483 | break; | |
484 | } | |
485 | unroll = ofpact_get_UNROLL_XLATE(a); | |
486 | } | |
487 | } | |
488 | } | |
489 | ||
490 | if (pin->action_set_len) { | |
491 | size_t start = ofpprop_start_nested(msg, NXCPT_ACTION_SET); | |
492 | ofpacts_put_openflow_actions(pin->action_set, | |
493 | pin->action_set_len, msg, version); | |
494 | ofpprop_end(msg, start); | |
495 | } | |
496 | ||
497 | if (msg->size > inner_ofs) { | |
498 | ofpprop_end(msg, continuation_ofs); | |
499 | } else { | |
500 | msg->size = continuation_ofs; | |
501 | } | |
502 | } | |
503 | ||
504 | static struct ofpbuf * | |
505 | ofputil_encode_ofp10_packet_in(const struct ofputil_packet_in *pin) | |
506 | { | |
507 | struct ofp10_packet_in *opi; | |
508 | struct ofpbuf *msg; | |
509 | ||
510 | msg = ofpraw_alloc_xid(OFPRAW_OFPT10_PACKET_IN, OFP10_VERSION, | |
511 | htonl(0), pin->packet_len); | |
512 | opi = ofpbuf_put_zeros(msg, offsetof(struct ofp10_packet_in, data)); | |
513 | opi->total_len = htons(pin->packet_len); | |
514 | opi->in_port = htons(ofp_to_u16(pin->flow_metadata.flow.in_port.ofp_port)); | |
515 | opi->reason = encode_packet_in_reason(pin->reason, OFP10_VERSION); | |
516 | opi->buffer_id = htonl(UINT32_MAX); | |
517 | ||
518 | return msg; | |
519 | } | |
520 | ||
521 | static struct ofpbuf * | |
522 | ofputil_encode_nx_packet_in(const struct ofputil_packet_in *pin, | |
523 | enum ofp_version version) | |
524 | { | |
525 | struct nx_packet_in *npi; | |
526 | struct ofpbuf *msg; | |
527 | size_t match_len; | |
528 | ||
529 | /* The final argument is just an estimate of the space required. */ | |
530 | msg = ofpraw_alloc_xid(OFPRAW_NXT_PACKET_IN, version, | |
531 | htonl(0), NXM_TYPICAL_LEN + 2 + pin->packet_len); | |
532 | ofpbuf_put_zeros(msg, sizeof *npi); | |
533 | match_len = nx_put_match(msg, &pin->flow_metadata, 0, 0); | |
534 | ofpbuf_put_zeros(msg, 2); | |
535 | ||
536 | npi = msg->msg; | |
537 | npi->buffer_id = htonl(UINT32_MAX); | |
538 | npi->total_len = htons(pin->packet_len); | |
539 | npi->reason = encode_packet_in_reason(pin->reason, version); | |
540 | npi->table_id = pin->table_id; | |
541 | npi->cookie = pin->cookie; | |
542 | npi->match_len = htons(match_len); | |
543 | ||
544 | return msg; | |
545 | } | |
546 | ||
547 | static struct ofpbuf * | |
548 | ofputil_encode_nx_packet_in2(const struct ofputil_packet_in_private *pin, | |
549 | enum ofp_version version, size_t include_bytes) | |
550 | { | |
551 | /* 'extra' is just an estimate of the space required. */ | |
552 | size_t extra = (pin->base.packet_len | |
553 | + NXM_TYPICAL_LEN /* flow_metadata */ | |
554 | + pin->stack_size * 4 | |
555 | + pin->actions_len | |
556 | + pin->action_set_len | |
557 | + 256); /* fudge factor */ | |
558 | struct ofpbuf *msg = ofpraw_alloc_xid(OFPRAW_NXT_PACKET_IN2, version, | |
559 | htonl(0), extra); | |
560 | ||
561 | ofputil_put_packet_in_private(pin, version, include_bytes, msg); | |
562 | if (pin->base.userdata_len) { | |
563 | ofpprop_put(msg, NXPINT_USERDATA, pin->base.userdata, | |
564 | pin->base.userdata_len); | |
565 | } | |
566 | ||
567 | ofpmsg_update_length(msg); | |
568 | return msg; | |
569 | } | |
570 | ||
571 | static struct ofpbuf * | |
572 | ofputil_encode_ofp11_packet_in(const struct ofputil_packet_in *pin) | |
573 | { | |
574 | struct ofp11_packet_in *opi; | |
575 | struct ofpbuf *msg; | |
576 | ||
577 | msg = ofpraw_alloc_xid(OFPRAW_OFPT11_PACKET_IN, OFP11_VERSION, | |
578 | htonl(0), pin->packet_len); | |
579 | opi = ofpbuf_put_zeros(msg, sizeof *opi); | |
580 | opi->buffer_id = htonl(UINT32_MAX); | |
581 | opi->in_port = ofputil_port_to_ofp11( | |
582 | pin->flow_metadata.flow.in_port.ofp_port); | |
583 | opi->in_phy_port = opi->in_port; | |
584 | opi->total_len = htons(pin->packet_len); | |
585 | opi->reason = encode_packet_in_reason(pin->reason, OFP11_VERSION); | |
586 | opi->table_id = pin->table_id; | |
587 | ||
588 | return msg; | |
589 | } | |
590 | ||
591 | static struct ofpbuf * | |
592 | ofputil_encode_ofp12_packet_in(const struct ofputil_packet_in *pin, | |
593 | enum ofp_version version) | |
594 | { | |
595 | enum ofpraw raw = (version >= OFP13_VERSION | |
596 | ? OFPRAW_OFPT13_PACKET_IN | |
597 | : OFPRAW_OFPT12_PACKET_IN); | |
598 | struct ofpbuf *msg; | |
599 | ||
600 | /* The final argument is just an estimate of the space required. */ | |
601 | msg = ofpraw_alloc_xid(raw, version, | |
602 | htonl(0), NXM_TYPICAL_LEN + 2 + pin->packet_len); | |
603 | ||
604 | struct ofp12_packet_in *opi = ofpbuf_put_zeros(msg, sizeof *opi); | |
605 | opi->buffer_id = htonl(UINT32_MAX); | |
606 | opi->total_len = htons(pin->packet_len); | |
607 | opi->reason = encode_packet_in_reason(pin->reason, version); | |
608 | opi->table_id = pin->table_id; | |
609 | ||
610 | if (version >= OFP13_VERSION) { | |
611 | ovs_be64 cookie = pin->cookie; | |
612 | ofpbuf_put(msg, &cookie, sizeof cookie); | |
613 | } | |
614 | ||
615 | oxm_put_match(msg, &pin->flow_metadata, version); | |
616 | ofpbuf_put_zeros(msg, 2); | |
617 | ||
618 | return msg; | |
619 | } | |
620 | ||
621 | /* Converts abstract ofputil_packet_in_private 'pin' into a PACKET_IN message | |
622 | * for 'protocol', using the packet-in format specified by 'packet_in_format'. | |
623 | * | |
624 | * This function is really meant only for use by ovs-vswitchd. To any other | |
625 | * code, the "continuation" data, i.e. the data that is in struct | |
626 | * ofputil_packet_in_private but not in struct ofputil_packet_in, is supposed | |
627 | * to be opaque (and it might change from one OVS version to another). Thus, | |
628 | * if any other code wants to encode a packet-in, it should use a non-"private" | |
629 | * version of this function. (Such a version doesn't currently exist because | |
630 | * only ovs-vswitchd currently wants to encode packet-ins. If you need one, | |
631 | * write it...) */ | |
632 | struct ofpbuf * | |
633 | ofputil_encode_packet_in_private(const struct ofputil_packet_in_private *pin, | |
634 | enum ofputil_protocol protocol, | |
635 | enum nx_packet_in_format packet_in_format) | |
636 | { | |
637 | enum ofp_version version = ofputil_protocol_to_ofp_version(protocol); | |
638 | ||
639 | struct ofpbuf *msg; | |
640 | switch (packet_in_format) { | |
641 | case NXPIF_STANDARD: | |
642 | switch (protocol) { | |
643 | case OFPUTIL_P_OF10_STD: | |
644 | case OFPUTIL_P_OF10_STD_TID: | |
645 | case OFPUTIL_P_OF10_NXM: | |
646 | case OFPUTIL_P_OF10_NXM_TID: | |
647 | msg = ofputil_encode_ofp10_packet_in(&pin->base); | |
648 | break; | |
649 | ||
650 | case OFPUTIL_P_OF11_STD: | |
651 | msg = ofputil_encode_ofp11_packet_in(&pin->base); | |
652 | break; | |
653 | ||
654 | case OFPUTIL_P_OF12_OXM: | |
655 | case OFPUTIL_P_OF13_OXM: | |
656 | case OFPUTIL_P_OF14_OXM: | |
657 | case OFPUTIL_P_OF15_OXM: | |
658 | case OFPUTIL_P_OF16_OXM: | |
659 | msg = ofputil_encode_ofp12_packet_in(&pin->base, version); | |
660 | break; | |
661 | ||
662 | default: | |
663 | OVS_NOT_REACHED(); | |
664 | } | |
665 | break; | |
666 | ||
667 | case NXPIF_NXT_PACKET_IN: | |
668 | msg = ofputil_encode_nx_packet_in(&pin->base, version); | |
669 | break; | |
670 | ||
671 | case NXPIF_NXT_PACKET_IN2: | |
672 | return ofputil_encode_nx_packet_in2(pin, version, | |
673 | pin->base.packet_len); | |
674 | ||
675 | default: | |
676 | OVS_NOT_REACHED(); | |
677 | } | |
678 | ||
679 | ofpbuf_put(msg, pin->base.packet, pin->base.packet_len); | |
680 | ofpmsg_update_length(msg); | |
681 | return msg; | |
682 | } | |
683 | ||
684 | /* Returns a string form of 'reason'. The return value is either a statically | |
685 | * allocated constant string or the 'bufsize'-byte buffer 'reasonbuf'. | |
686 | * 'bufsize' should be at least OFPUTIL_PACKET_IN_REASON_BUFSIZE. */ | |
687 | const char * | |
688 | ofputil_packet_in_reason_to_string(enum ofp_packet_in_reason reason, | |
689 | char *reasonbuf, size_t bufsize) | |
690 | { | |
691 | switch (reason) { | |
692 | case OFPR_NO_MATCH: | |
693 | return "no_match"; | |
694 | case OFPR_ACTION: | |
695 | return "action"; | |
696 | case OFPR_INVALID_TTL: | |
697 | return "invalid_ttl"; | |
698 | case OFPR_ACTION_SET: | |
699 | return "action_set"; | |
700 | case OFPR_GROUP: | |
701 | return "group"; | |
702 | case OFPR_PACKET_OUT: | |
703 | return "packet_out"; | |
704 | case OFPR_EXPLICIT_MISS: | |
705 | case OFPR_IMPLICIT_MISS: | |
706 | return ""; | |
707 | ||
708 | case OFPR_N_REASONS: | |
709 | default: | |
710 | snprintf(reasonbuf, bufsize, "%d", (int) reason); | |
711 | return reasonbuf; | |
712 | } | |
713 | } | |
714 | ||
715 | bool | |
716 | ofputil_packet_in_reason_from_string(const char *s, | |
717 | enum ofp_packet_in_reason *reason) | |
718 | { | |
719 | int i; | |
720 | ||
721 | for (i = 0; i < OFPR_N_REASONS; i++) { | |
722 | char reasonbuf[OFPUTIL_PACKET_IN_REASON_BUFSIZE]; | |
723 | const char *reason_s; | |
724 | ||
725 | reason_s = ofputil_packet_in_reason_to_string(i, reasonbuf, | |
726 | sizeof reasonbuf); | |
727 | if (!strcasecmp(s, reason_s)) { | |
728 | *reason = i; | |
729 | return true; | |
730 | } | |
731 | } | |
732 | return false; | |
733 | } | |
734 | ||
735 | /* Returns a newly allocated NXT_RESUME message for 'pin', with the given | |
736 | * 'continuation', for 'protocol'. This message is suitable for resuming the | |
737 | * pipeline traveral of the packet represented by 'pin', if sent to the switch | |
738 | * from which 'pin' was received. */ | |
739 | struct ofpbuf * | |
740 | ofputil_encode_resume(const struct ofputil_packet_in *pin, | |
741 | const struct ofpbuf *continuation, | |
742 | enum ofputil_protocol protocol) | |
743 | { | |
744 | enum ofp_version version = ofputil_protocol_to_ofp_version(protocol); | |
745 | size_t extra = pin->packet_len + NXM_TYPICAL_LEN + continuation->size; | |
746 | struct ofpbuf *msg = ofpraw_alloc_xid(OFPRAW_NXT_RESUME, version, | |
747 | 0, extra); | |
748 | ofputil_put_packet_in(pin, version, pin->packet_len, msg); | |
749 | ofpprop_put_nested(msg, NXPINT_CONTINUATION, continuation); | |
750 | ofpmsg_update_length(msg); | |
751 | return msg; | |
752 | } | |
753 | ||
754 | static enum ofperr | |
755 | parse_stack_prop(const struct ofpbuf *property, struct ofpbuf *stack) | |
756 | { | |
757 | unsigned int len = ofpbuf_msgsize(property); | |
758 | if (len > sizeof(union mf_subvalue)) { | |
759 | VLOG_WARN_RL(&rl, "NXCPT_STACK property has bad length %u", | |
760 | len); | |
761 | return OFPERR_OFPBPC_BAD_LEN; | |
762 | } | |
763 | nx_stack_push_bottom(stack, property->msg, len); | |
764 | return 0; | |
765 | } | |
766 | ||
767 | static enum ofperr | |
768 | parse_actions_property(struct ofpbuf *property, enum ofp_version version, | |
769 | struct ofpbuf *ofpacts) | |
770 | { | |
771 | if (!ofpbuf_try_pull(property, ROUND_UP(ofpbuf_headersize(property), 8))) { | |
772 | VLOG_WARN_RL(&rl, "actions property has bad length %"PRIu32, | |
773 | property->size); | |
774 | return OFPERR_OFPBPC_BAD_LEN; | |
775 | } | |
776 | ||
777 | return ofpacts_pull_openflow_actions(property, property->size, | |
778 | version, NULL, NULL, ofpacts); | |
779 | } | |
780 | ||
781 | /* This is like ofputil_decode_packet_in(), except that it decodes the | |
782 | * continuation data into 'pin'. The format of this data is supposed to be | |
783 | * opaque to any process other than ovs-vswitchd, so this function should not | |
784 | * be used outside ovs-vswitchd. | |
785 | * | |
786 | * 'vl_mff_map' is an optional parameter that is used to validate the length | |
787 | * of variable length mf_fields in 'match'. If it is not provided, the | |
788 | * default mf_fields with maximum length will be used. | |
789 | * | |
790 | * When successful, 'pin' contains some dynamically allocated data. Call | |
791 | * ofputil_packet_in_private_destroy() to free this data. */ | |
792 | enum ofperr | |
793 | ofputil_decode_packet_in_private(const struct ofp_header *oh, bool loose, | |
794 | const struct tun_table *tun_table, | |
795 | const struct vl_mff_map *vl_mff_map, | |
796 | struct ofputil_packet_in_private *pin, | |
797 | size_t *total_len, uint32_t *buffer_id) | |
798 | { | |
799 | memset(pin, 0, sizeof *pin); | |
800 | ||
801 | struct ofpbuf continuation; | |
802 | enum ofperr error; | |
803 | error = ofputil_decode_packet_in(oh, loose, tun_table, vl_mff_map, | |
804 | &pin->base, total_len, buffer_id, | |
805 | &continuation); | |
806 | if (error) { | |
807 | return error; | |
808 | } | |
809 | ||
810 | struct ofpbuf actions, action_set; | |
811 | ofpbuf_init(&actions, 0); | |
812 | ofpbuf_init(&action_set, 0); | |
813 | ||
814 | uint8_t table_id = 0; | |
815 | ovs_be64 cookie = 0; | |
816 | ||
817 | struct ofpbuf stack; | |
818 | ofpbuf_init(&stack, 0); | |
819 | ||
820 | while (continuation.size > 0) { | |
821 | struct ofpbuf payload; | |
822 | uint64_t type; | |
823 | ||
824 | error = ofpprop_pull(&continuation, &payload, &type); | |
825 | if (error) { | |
826 | break; | |
827 | } | |
828 | ||
829 | switch (type) { | |
830 | case NXCPT_BRIDGE: | |
831 | error = ofpprop_parse_uuid(&payload, &pin->bridge); | |
832 | break; | |
833 | ||
834 | case NXCPT_STACK: | |
835 | error = parse_stack_prop(&payload, &stack); | |
836 | break; | |
837 | ||
838 | case NXCPT_MIRRORS: | |
839 | error = ofpprop_parse_u32(&payload, &pin->mirrors); | |
840 | break; | |
841 | ||
842 | case NXCPT_CONNTRACKED: | |
843 | pin->conntracked = true; | |
844 | break; | |
845 | ||
846 | case NXCPT_TABLE_ID: | |
847 | error = ofpprop_parse_u8(&payload, &table_id); | |
848 | break; | |
849 | ||
850 | case NXCPT_COOKIE: | |
851 | error = ofpprop_parse_be64(&payload, &cookie); | |
852 | break; | |
853 | ||
854 | case NXCPT_ACTIONS: { | |
855 | struct ofpact_unroll_xlate *unroll | |
856 | = ofpact_put_UNROLL_XLATE(&actions); | |
857 | unroll->rule_table_id = table_id; | |
858 | unroll->rule_cookie = cookie; | |
859 | error = parse_actions_property(&payload, oh->version, &actions); | |
860 | break; | |
861 | } | |
862 | ||
863 | case NXCPT_ACTION_SET: | |
864 | error = parse_actions_property(&payload, oh->version, &action_set); | |
865 | break; | |
866 | ||
867 | default: | |
868 | error = OFPPROP_UNKNOWN(loose, "continuation", type); | |
869 | break; | |
870 | } | |
871 | if (error) { | |
872 | break; | |
873 | } | |
874 | } | |
875 | ||
876 | pin->actions_len = actions.size; | |
877 | pin->actions = ofpbuf_steal_data(&actions); | |
878 | pin->action_set_len = action_set.size; | |
879 | pin->action_set = ofpbuf_steal_data(&action_set); | |
880 | pin->stack_size = stack.size; | |
881 | pin->stack = ofpbuf_steal_data(&stack); | |
882 | ||
883 | if (error) { | |
884 | ofputil_packet_in_private_destroy(pin); | |
885 | } | |
886 | ||
887 | return error; | |
888 | } | |
889 | ||
890 | /* Frees data in 'pin' that is dynamically allocated by | |
891 | * ofputil_decode_packet_in_private(). | |
892 | * | |
893 | * 'pin->base' contains some pointer members that | |
894 | * ofputil_decode_packet_in_private() doesn't initialize to newly allocated | |
895 | * data, so this function doesn't free those. */ | |
896 | void | |
897 | ofputil_packet_in_private_destroy(struct ofputil_packet_in_private *pin) | |
898 | { | |
899 | if (pin) { | |
900 | free(pin->stack); | |
901 | free(pin->actions); | |
902 | free(pin->action_set); | |
903 | } | |
904 | } | |
905 | ||
906 | /* Converts an OFPT_PACKET_OUT in 'opo' into an abstract ofputil_packet_out in | |
907 | * 'po'. | |
908 | * | |
909 | * Uses 'ofpacts' to store the abstract OFPACT_* version of the packet out | |
910 | * message's actions. The caller must initialize 'ofpacts' and retains | |
911 | * ownership of it. 'po->ofpacts' will point into the 'ofpacts' buffer. | |
912 | * | |
913 | * 'po->packet' refers to the packet data in 'oh', so the buffer containing | |
914 | * 'oh' must not be destroyed while 'po' is being used. | |
915 | * | |
916 | * Returns 0 if successful, otherwise an OFPERR_* value. */ | |
917 | enum ofperr | |
918 | ofputil_decode_packet_out(struct ofputil_packet_out *po, | |
919 | const struct ofp_header *oh, | |
920 | const struct tun_table *tun_table, | |
921 | struct ofpbuf *ofpacts) | |
922 | { | |
923 | struct ofpbuf b = ofpbuf_const_initializer(oh, ntohs(oh->length)); | |
924 | enum ofpraw raw = ofpraw_pull_assert(&b); | |
925 | ||
926 | ofpbuf_clear(ofpacts); | |
927 | match_init_catchall(&po->flow_metadata); | |
928 | if (raw == OFPRAW_OFPT15_PACKET_OUT) { | |
929 | enum ofperr error; | |
930 | const struct ofp15_packet_out *opo = ofpbuf_pull(&b, sizeof *opo); | |
931 | ||
932 | po->buffer_id = ntohl(opo->buffer_id); | |
933 | error = oxm_pull_match_loose(&b, true, tun_table, &po->flow_metadata); | |
934 | if (error) { | |
935 | return error; | |
936 | } | |
937 | ||
938 | if (!po->flow_metadata.wc.masks.in_port.ofp_port) { | |
939 | return OFPERR_OFPBRC_BAD_PORT; | |
940 | } | |
941 | ||
942 | error = ofpacts_pull_openflow_actions(&b, ntohs(opo->actions_len), | |
943 | oh->version, NULL, NULL, | |
944 | ofpacts); | |
945 | if (error) { | |
946 | return error; | |
947 | } | |
948 | } else if (raw == OFPRAW_OFPT11_PACKET_OUT) { | |
949 | enum ofperr error; | |
950 | ofp_port_t in_port; | |
951 | const struct ofp11_packet_out *opo = ofpbuf_pull(&b, sizeof *opo); | |
952 | ||
953 | po->buffer_id = ntohl(opo->buffer_id); | |
954 | error = ofputil_port_from_ofp11(opo->in_port, &in_port); | |
955 | if (error) { | |
956 | return error; | |
957 | } | |
958 | match_set_packet_type(&po->flow_metadata, htonl(PT_ETH)); | |
959 | match_set_in_port(&po->flow_metadata, in_port); | |
960 | ||
961 | error = ofpacts_pull_openflow_actions(&b, ntohs(opo->actions_len), | |
962 | oh->version, NULL, NULL, | |
963 | ofpacts); | |
964 | if (error) { | |
965 | return error; | |
966 | } | |
967 | } else if (raw == OFPRAW_OFPT10_PACKET_OUT) { | |
968 | enum ofperr error; | |
969 | const struct ofp10_packet_out *opo = ofpbuf_pull(&b, sizeof *opo); | |
970 | ||
971 | po->buffer_id = ntohl(opo->buffer_id); | |
972 | match_set_packet_type(&po->flow_metadata, htonl(PT_ETH)); | |
973 | match_set_in_port(&po->flow_metadata, u16_to_ofp(ntohs(opo->in_port))); | |
974 | ||
975 | error = ofpacts_pull_openflow_actions(&b, ntohs(opo->actions_len), | |
976 | oh->version, NULL, NULL, | |
977 | ofpacts); | |
978 | if (error) { | |
979 | return error; | |
980 | } | |
981 | } else { | |
982 | OVS_NOT_REACHED(); | |
983 | } | |
984 | ||
985 | ofp_port_t in_port = po->flow_metadata.flow.in_port.ofp_port; | |
986 | if (ofp_to_u16(in_port) >= ofp_to_u16(OFPP_MAX) | |
987 | && in_port != OFPP_LOCAL | |
988 | && in_port != OFPP_NONE | |
989 | && in_port != OFPP_CONTROLLER) { | |
990 | VLOG_WARN_RL(&rl, "packet-out has bad input port %#"PRIx32, | |
991 | po->flow_metadata.flow.in_port.ofp_port); | |
992 | return OFPERR_OFPBRC_BAD_PORT; | |
993 | } | |
994 | ||
995 | po->ofpacts = ofpacts->data; | |
996 | po->ofpacts_len = ofpacts->size; | |
997 | ||
998 | if (po->buffer_id == UINT32_MAX) { | |
999 | po->packet = b.data; | |
1000 | po->packet_len = b.size; | |
1001 | } else { | |
1002 | po->packet = NULL; | |
1003 | po->packet_len = 0; | |
1004 | } | |
1005 | ||
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | struct ofpbuf * | |
1010 | ofputil_encode_packet_out(const struct ofputil_packet_out *po, | |
1011 | enum ofputil_protocol protocol) | |
1012 | { | |
1013 | enum ofp_version ofp_version = ofputil_protocol_to_ofp_version(protocol); | |
1014 | struct ofpbuf *msg; | |
1015 | size_t size; | |
1016 | ||
1017 | size = po->ofpacts_len; | |
1018 | if (po->buffer_id == UINT32_MAX) { | |
1019 | size += po->packet_len; | |
1020 | } | |
1021 | ||
1022 | switch (ofp_version) { | |
1023 | case OFP10_VERSION: { | |
1024 | struct ofp10_packet_out *opo; | |
1025 | size_t actions_ofs; | |
1026 | ||
1027 | msg = ofpraw_alloc(OFPRAW_OFPT10_PACKET_OUT, OFP10_VERSION, size); | |
1028 | ofpbuf_put_zeros(msg, sizeof *opo); | |
1029 | actions_ofs = msg->size; | |
1030 | ofpacts_put_openflow_actions(po->ofpacts, po->ofpacts_len, msg, | |
1031 | ofp_version); | |
1032 | ||
1033 | opo = msg->msg; | |
1034 | opo->buffer_id = htonl(po->buffer_id); | |
1035 | opo->in_port =htons(ofp_to_u16( | |
1036 | po->flow_metadata.flow.in_port.ofp_port)); | |
1037 | opo->actions_len = htons(msg->size - actions_ofs); | |
1038 | break; | |
1039 | } | |
1040 | ||
1041 | case OFP11_VERSION: | |
1042 | case OFP12_VERSION: | |
1043 | case OFP13_VERSION: | |
1044 | case OFP14_VERSION: { | |
1045 | struct ofp11_packet_out *opo; | |
1046 | size_t len; | |
1047 | ||
1048 | msg = ofpraw_alloc(OFPRAW_OFPT11_PACKET_OUT, ofp_version, size); | |
1049 | ofpbuf_put_zeros(msg, sizeof *opo); | |
1050 | len = ofpacts_put_openflow_actions(po->ofpacts, po->ofpacts_len, msg, | |
1051 | ofp_version); | |
1052 | opo = msg->msg; | |
1053 | opo->buffer_id = htonl(po->buffer_id); | |
1054 | opo->in_port = | |
1055 | ofputil_port_to_ofp11(po->flow_metadata.flow.in_port.ofp_port); | |
1056 | opo->actions_len = htons(len); | |
1057 | break; | |
1058 | } | |
1059 | ||
1060 | case OFP15_VERSION: | |
1061 | case OFP16_VERSION: { | |
1062 | struct ofp15_packet_out *opo; | |
1063 | size_t len; | |
1064 | ||
1065 | /* The final argument is just an estimate of the space required. */ | |
1066 | msg = ofpraw_alloc(OFPRAW_OFPT15_PACKET_OUT, ofp_version, | |
1067 | size + NXM_TYPICAL_LEN); | |
1068 | ofpbuf_put_zeros(msg, sizeof *opo); | |
1069 | oxm_put_match(msg, &po->flow_metadata, ofp_version); | |
1070 | len = ofpacts_put_openflow_actions(po->ofpacts, po->ofpacts_len, msg, | |
1071 | ofp_version); | |
1072 | opo = msg->msg; | |
1073 | opo->buffer_id = htonl(po->buffer_id); | |
1074 | opo->actions_len = htons(len); | |
1075 | break; | |
1076 | } | |
1077 | ||
1078 | default: | |
1079 | OVS_NOT_REACHED(); | |
1080 | } | |
1081 | ||
1082 | if (po->buffer_id == UINT32_MAX) { | |
1083 | ofpbuf_put(msg, po->packet, po->packet_len); | |
1084 | } | |
1085 | ||
1086 | ofpmsg_update_length(msg); | |
1087 | ||
1088 | return msg; | |
1089 | } | |
1090 | \f | |
1091 | /* Parse a string representation of a OFPT_PACKET_OUT to '*po'. If successful, | |
1092 | * both 'po->ofpacts' and 'po->packet' must be free()d by the caller. */ | |
1093 | static char * OVS_WARN_UNUSED_RESULT | |
1094 | parse_ofp_packet_out_str__(struct ofputil_packet_out *po, char *string, | |
1095 | const struct ofputil_port_map *port_map, | |
1096 | const struct ofputil_table_map *table_map, | |
1097 | enum ofputil_protocol *usable_protocols) | |
1098 | { | |
1099 | enum ofputil_protocol action_usable_protocols; | |
1100 | uint64_t stub[256 / 8]; | |
1101 | struct ofpbuf ofpacts = OFPBUF_STUB_INITIALIZER(stub); | |
1102 | struct dp_packet *packet = NULL; | |
1103 | char *act_str = NULL; | |
1104 | char *name, *value; | |
1105 | char *error = NULL; | |
1106 | ||
1107 | *usable_protocols = OFPUTIL_P_ANY; | |
1108 | ||
1109 | *po = (struct ofputil_packet_out) { | |
1110 | .buffer_id = UINT32_MAX, | |
1111 | }; | |
1112 | match_init_catchall(&po->flow_metadata); | |
1113 | match_set_in_port(&po->flow_metadata, OFPP_CONTROLLER); | |
1114 | ||
1115 | act_str = ofp_extract_actions(string); | |
1116 | ||
1117 | while (ofputil_parse_key_value(&string, &name, &value)) { | |
1118 | if (!*value) { | |
1119 | error = xasprintf("field %s missing value", name); | |
1120 | goto out; | |
1121 | } | |
1122 | ||
1123 | if (!strcmp(name, "in_port")) { | |
1124 | ofp_port_t in_port; | |
1125 | if (!ofputil_port_from_string(value, port_map, &in_port)) { | |
1126 | error = xasprintf("%s is not a valid OpenFlow port", value); | |
1127 | goto out; | |
1128 | } | |
1129 | if (ofp_to_u16(in_port) > ofp_to_u16(OFPP_MAX) | |
1130 | && in_port != OFPP_LOCAL | |
1131 | && in_port != OFPP_NONE | |
1132 | && in_port != OFPP_CONTROLLER) { | |
1133 | error = xasprintf( | |
1134 | "%s is not a valid OpenFlow port for PACKET_OUT", | |
1135 | value); | |
1136 | goto out; | |
1137 | } | |
1138 | match_set_in_port(&po->flow_metadata, in_port); | |
1139 | } else if (!strcmp(name, "packet_type")) { | |
1140 | char *ns = value; | |
1141 | char *ns_type = strstr(value, ","); | |
1142 | if (ns_type) { | |
1143 | ovs_be32 packet_type; | |
1144 | *ns_type = '\0'; | |
1145 | packet_type = PACKET_TYPE_BE(strtoul(ns, NULL, 0), | |
1146 | strtoul(++ns_type, NULL, 0)); | |
1147 | match_set_packet_type(&po->flow_metadata, packet_type); | |
1148 | } else { | |
1149 | error = xasprintf("%s(%s) can't be interpreted", name, value); | |
1150 | goto out; | |
1151 | } | |
1152 | } else if (!strcmp(name, "packet")) { | |
1153 | const char *error_msg = eth_from_hex(value, &packet); | |
1154 | if (error_msg) { | |
1155 | error = xasprintf("%s: %s", name, error_msg); | |
1156 | goto out; | |
1157 | } | |
1158 | } else { | |
1159 | const struct mf_field *mf = mf_from_name(name); | |
1160 | if (!mf) { | |
1161 | error = xasprintf("unknown keyword %s", name); | |
1162 | goto out; | |
1163 | } | |
1164 | ||
1165 | error = ofp_parse_field(mf, value, port_map, &po->flow_metadata, | |
1166 | usable_protocols); | |
1167 | if (error) { | |
1168 | goto out; | |
1169 | } | |
1170 | if (!mf_is_pipeline_field(mf)) { | |
1171 | error = xasprintf("%s is not a valid pipeline field " | |
1172 | "for PACKET_OUT", name); | |
1173 | goto out; | |
1174 | } | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | if (!packet || !dp_packet_size(packet)) { | |
1179 | error = xstrdup("must specify packet"); | |
1180 | goto out; | |
1181 | } | |
1182 | ||
1183 | if (act_str) { | |
1184 | struct ofpact_parse_params pp = { | |
1185 | .port_map = port_map, | |
1186 | .table_map = table_map, | |
1187 | .ofpacts = &ofpacts, | |
1188 | .usable_protocols = &action_usable_protocols, | |
1189 | }; | |
1190 | error = ofpacts_parse_actions(act_str, &pp); | |
1191 | *usable_protocols &= action_usable_protocols; | |
1192 | if (error) { | |
1193 | goto out; | |
1194 | } | |
1195 | } | |
1196 | po->ofpacts_len = ofpacts.size; | |
1197 | po->ofpacts = ofpbuf_steal_data(&ofpacts); | |
1198 | ||
1199 | po->packet_len = dp_packet_size(packet); | |
1200 | po->packet = dp_packet_steal_data(packet); | |
1201 | out: | |
1202 | ofpbuf_uninit(&ofpacts); | |
1203 | dp_packet_delete(packet); | |
1204 | return error; | |
1205 | } | |
1206 | ||
1207 | /* Convert 'str_' (as described in the Packet-Out Syntax section of the | |
1208 | * ovs-ofctl man page) into 'po' for sending a OFPT_PACKET_OUT message to a | |
1209 | * switch. Returns the set of usable protocols in '*usable_protocols'. | |
1210 | * | |
1211 | * Returns NULL if successful, otherwise a malloc()'d string describing the | |
1212 | * error. The caller is responsible for freeing the returned string. | |
1213 | * If successful, both 'po->ofpacts' and 'po->packet' must be free()d by | |
1214 | * the caller. */ | |
1215 | char * OVS_WARN_UNUSED_RESULT | |
1216 | parse_ofp_packet_out_str(struct ofputil_packet_out *po, const char *str_, | |
1217 | const struct ofputil_port_map *port_map, | |
1218 | const struct ofputil_table_map *table_map, | |
1219 | enum ofputil_protocol *usable_protocols) | |
1220 | { | |
1221 | char *string = xstrdup(str_); | |
1222 | char *error; | |
1223 | ||
1224 | error = parse_ofp_packet_out_str__(po, string, port_map, table_map, | |
1225 | usable_protocols); | |
1226 | if (error) { | |
1227 | po->ofpacts = NULL; | |
1228 | po->ofpacts_len = 0; | |
1229 | } | |
1230 | ||
1231 | free(string); | |
1232 | return error; | |
1233 | } |