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1 | /* |
2 | * Copyright (c) 2010 Nicira Networks. | |
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 | ||
19 | #include "nx-match.h" | |
20 | ||
21 | #include "classifier.h" | |
22 | #include "dynamic-string.h" | |
23 | #include "ofp-util.h" | |
24 | #include "ofpbuf.h" | |
25 | #include "openflow/nicira-ext.h" | |
26 | #include "packets.h" | |
27 | #include "unaligned.h" | |
28 | #include "vlog.h" | |
29 | ||
30 | VLOG_DEFINE_THIS_MODULE(nx_match); | |
31 | ||
32 | /* Rate limit for nx_match parse errors. These always indicate a bug in the | |
33 | * peer and so there's not much point in showing a lot of them. */ | |
34 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); | |
35 | ||
36 | enum { | |
37 | NXM_INVALID = OFP_MKERR_NICIRA(OFPET_BAD_REQUEST, NXBRC_NXM_INVALID), | |
38 | NXM_BAD_TYPE = OFP_MKERR_NICIRA(OFPET_BAD_REQUEST, NXBRC_NXM_BAD_TYPE), | |
39 | NXM_BAD_VALUE = OFP_MKERR_NICIRA(OFPET_BAD_REQUEST, NXBRC_NXM_BAD_VALUE), | |
40 | NXM_BAD_MASK = OFP_MKERR_NICIRA(OFPET_BAD_REQUEST, NXBRC_NXM_BAD_MASK), | |
41 | NXM_BAD_PREREQ = OFP_MKERR_NICIRA(OFPET_BAD_REQUEST, NXBRC_NXM_BAD_PREREQ), | |
42 | NXM_DUP_TYPE = OFP_MKERR_NICIRA(OFPET_BAD_REQUEST, NXBRC_NXM_DUP_TYPE), | |
43 | BAD_ARGUMENT = OFP_MKERR(OFPET_BAD_ACTION, OFPBAC_BAD_ARGUMENT) | |
44 | }; | |
45 | ||
46 | /* For each NXM_* field, define NFI_NXM_* as consecutive integers starting from | |
47 | * zero. */ | |
48 | enum nxm_field_index { | |
49 | #define DEFINE_FIELD(HEADER, WILDCARD, DL_TYPE, NW_PROTO) NFI_NXM_##HEADER, | |
50 | #include "nx-match.def" | |
51 | N_NXM_FIELDS | |
52 | }; | |
53 | ||
54 | struct nxm_field { | |
55 | struct hmap_node hmap_node; | |
56 | enum nxm_field_index index; /* NFI_* value. */ | |
57 | uint32_t header; /* NXM_* value. */ | |
58 | uint32_t wildcard; /* Wildcard bit, if exactly one. */ | |
59 | ovs_be16 dl_type; /* dl_type prerequisite, if nonzero. */ | |
60 | uint8_t nw_proto; /* nw_proto prerequisite, if nonzero. */ | |
61 | const char *name; /* "NXM_*" string. */ | |
62 | }; | |
63 | ||
64 | /* All the known fields. */ | |
65 | static struct nxm_field nxm_fields[N_NXM_FIELDS] = { | |
66 | #define DEFINE_FIELD(HEADER, WILDCARD, DL_TYPE, NW_PROTO) \ | |
67 | { HMAP_NODE_NULL_INITIALIZER, NFI_NXM_##HEADER, NXM_##HEADER, WILDCARD, \ | |
68 | CONSTANT_HTONS(DL_TYPE), NW_PROTO, "NXM_" #HEADER }, | |
69 | #include "nx-match.def" | |
70 | }; | |
71 | ||
72 | /* Hash table of 'nxm_fields'. */ | |
73 | static struct hmap all_nxm_fields = HMAP_INITIALIZER(&all_nxm_fields); | |
74 | ||
75 | static void | |
76 | nxm_init(void) | |
77 | { | |
78 | if (hmap_is_empty(&all_nxm_fields)) { | |
79 | int i; | |
80 | ||
81 | for (i = 0; i < N_NXM_FIELDS; i++) { | |
82 | struct nxm_field *f = &nxm_fields[i]; | |
83 | hmap_insert(&all_nxm_fields, &f->hmap_node, | |
84 | hash_int(f->header, 0)); | |
85 | } | |
86 | ||
87 | /* Verify that the header values are unique (duplicate "case" values | |
88 | * cause a compile error). */ | |
89 | switch (0) { | |
90 | #define DEFINE_FIELD(HEADER, WILDCARD, DL_TYPE, NW_PROTO) \ | |
91 | case NXM_##HEADER: break; | |
92 | #include "nx-match.def" | |
93 | } | |
94 | } | |
95 | } | |
96 | ||
97 | static const struct nxm_field * | |
98 | nxm_field_lookup(uint32_t header) | |
99 | { | |
100 | struct nxm_field *f; | |
101 | ||
102 | nxm_init(); | |
103 | ||
104 | HMAP_FOR_EACH_WITH_HASH (f, hmap_node, hash_int(header, 0), | |
105 | &all_nxm_fields) { | |
106 | if (f->header == header) { | |
107 | return f; | |
108 | } | |
109 | } | |
110 | ||
111 | return NULL; | |
112 | } | |
113 | ||
114 | /* Returns the width of the data for a field with the given 'header', in | |
115 | * bytes. */ | |
116 | static int | |
117 | nxm_field_bytes(uint32_t header) | |
118 | { | |
119 | unsigned int length = NXM_LENGTH(header); | |
120 | return NXM_HASMASK(header) ? length / 2 : length; | |
121 | } | |
122 | \f | |
123 | /* nx_pull_match() and helpers. */ | |
124 | ||
125 | static int | |
126 | parse_tci(struct cls_rule *rule, ovs_be16 tci, ovs_be16 mask) | |
127 | { | |
128 | enum { OFPFW_DL_TCI = OFPFW_DL_VLAN | OFPFW_DL_VLAN_PCP }; | |
129 | if ((rule->wc.wildcards & OFPFW_DL_TCI) != OFPFW_DL_TCI) { | |
130 | return NXM_DUP_TYPE; | |
131 | } else { | |
132 | return cls_rule_set_dl_tci_masked(rule, tci, mask) ? 0 : NXM_INVALID; | |
133 | } | |
134 | } | |
135 | ||
136 | static int | |
137 | parse_nxm_entry(struct cls_rule *rule, const struct nxm_field *f, | |
138 | const void *value, const void *mask) | |
139 | { | |
140 | struct flow_wildcards *wc = &rule->wc; | |
141 | struct flow *flow = &rule->flow; | |
142 | ||
143 | switch (f->index) { | |
144 | /* Metadata. */ | |
145 | case NFI_NXM_OF_IN_PORT: | |
146 | flow->in_port = ntohs(get_unaligned_u16(value)); | |
147 | if (flow->in_port == OFPP_LOCAL) { | |
148 | flow->in_port = ODPP_LOCAL; | |
149 | } | |
150 | return 0; | |
151 | ||
152 | /* Ethernet header. */ | |
153 | case NFI_NXM_OF_ETH_DST: | |
154 | memcpy(flow->dl_dst, value, ETH_ADDR_LEN); | |
155 | return 0; | |
156 | case NFI_NXM_OF_ETH_SRC: | |
157 | memcpy(flow->dl_src, value, ETH_ADDR_LEN); | |
158 | return 0; | |
159 | case NFI_NXM_OF_ETH_TYPE: | |
160 | flow->dl_type = get_unaligned_u16(value); | |
161 | return 0; | |
162 | ||
163 | /* 802.1Q header. */ | |
164 | case NFI_NXM_OF_VLAN_TCI: | |
165 | return parse_tci(rule, get_unaligned_u16(value), htons(UINT16_MAX)); | |
166 | ||
167 | case NFI_NXM_OF_VLAN_TCI_W: | |
168 | return parse_tci(rule, get_unaligned_u16(value), | |
169 | get_unaligned_u16(mask)); | |
170 | ||
171 | /* IP header. */ | |
172 | case NFI_NXM_OF_IP_TOS: | |
173 | if (*(uint8_t *) value & 0x03) { | |
174 | return NXM_BAD_VALUE; | |
175 | } else { | |
176 | flow->nw_tos = *(uint8_t *) value; | |
177 | return 0; | |
178 | } | |
179 | case NFI_NXM_OF_IP_PROTO: | |
180 | flow->nw_proto = *(uint8_t *) value; | |
181 | return 0; | |
182 | ||
183 | /* IP addresses in IP and ARP headers. */ | |
184 | case NFI_NXM_OF_IP_SRC: | |
185 | case NFI_NXM_OF_ARP_SPA: | |
186 | if (wc->nw_src_mask) { | |
187 | return NXM_DUP_TYPE; | |
188 | } else { | |
189 | cls_rule_set_nw_src(rule, get_unaligned_u32(value)); | |
190 | return 0; | |
191 | } | |
192 | case NFI_NXM_OF_IP_SRC_W: | |
193 | case NFI_NXM_OF_ARP_SPA_W: | |
194 | if (wc->nw_src_mask) { | |
195 | return NXM_DUP_TYPE; | |
196 | } else { | |
197 | ovs_be32 ip = get_unaligned_u32(value); | |
198 | ovs_be32 netmask = get_unaligned_u32(mask); | |
199 | if (!cls_rule_set_nw_src_masked(rule, ip, netmask)) { | |
200 | return NXM_BAD_MASK; | |
201 | } | |
202 | return 0; | |
203 | } | |
204 | case NFI_NXM_OF_IP_DST: | |
205 | case NFI_NXM_OF_ARP_TPA: | |
206 | if (wc->nw_dst_mask) { | |
207 | return NXM_DUP_TYPE; | |
208 | } else { | |
209 | cls_rule_set_nw_dst(rule, get_unaligned_u32(value)); | |
210 | return 0; | |
211 | } | |
212 | case NFI_NXM_OF_IP_DST_W: | |
213 | case NFI_NXM_OF_ARP_TPA_W: | |
214 | if (wc->nw_dst_mask) { | |
215 | return NXM_DUP_TYPE; | |
216 | } else { | |
217 | ovs_be32 ip = get_unaligned_u32(value); | |
218 | ovs_be32 netmask = get_unaligned_u32(mask); | |
219 | if (!cls_rule_set_nw_dst_masked(rule, ip, netmask)) { | |
220 | return NXM_BAD_MASK; | |
221 | } | |
222 | return 0; | |
223 | } | |
224 | ||
225 | /* TCP header. */ | |
226 | case NFI_NXM_OF_TCP_SRC: | |
227 | flow->tp_src = get_unaligned_u16(value); | |
228 | return 0; | |
229 | case NFI_NXM_OF_TCP_DST: | |
230 | flow->tp_dst = get_unaligned_u16(value); | |
231 | return 0; | |
232 | ||
233 | /* UDP header. */ | |
234 | case NFI_NXM_OF_UDP_SRC: | |
235 | flow->tp_src = get_unaligned_u16(value); | |
236 | return 0; | |
237 | case NFI_NXM_OF_UDP_DST: | |
238 | flow->tp_dst = get_unaligned_u16(value); | |
239 | return 0; | |
240 | ||
241 | /* ICMP header. */ | |
242 | case NFI_NXM_OF_ICMP_TYPE: | |
243 | flow->tp_src = htons(*(uint8_t *) value); | |
244 | return 0; | |
245 | case NFI_NXM_OF_ICMP_CODE: | |
246 | flow->tp_dst = htons(*(uint8_t *) value); | |
247 | return 0; | |
248 | ||
249 | /* ARP header. */ | |
250 | case NFI_NXM_OF_ARP_OP: | |
251 | if (ntohs(get_unaligned_u16(value)) > 255) { | |
252 | return NXM_BAD_VALUE; | |
253 | } else { | |
254 | flow->nw_proto = ntohs(get_unaligned_u16(value)); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | /* Tunnel ID. */ | |
259 | case NFI_NXM_NX_TUN_ID: | |
260 | flow->tun_id = htonl(ntohll(get_unaligned_u64(value))); | |
261 | return 0; | |
262 | ||
263 | case N_NXM_FIELDS: | |
264 | NOT_REACHED(); | |
265 | } | |
266 | NOT_REACHED(); | |
267 | } | |
268 | ||
269 | static bool | |
270 | nxm_prereqs_ok(const struct nxm_field *field, const struct flow *flow) | |
271 | { | |
272 | return (!field->dl_type | |
273 | || (field->dl_type == flow->dl_type | |
274 | && (!field->nw_proto || field->nw_proto == flow->nw_proto))); | |
275 | } | |
276 | ||
277 | static uint32_t | |
278 | nx_entry_ok(const void *p, unsigned int match_len) | |
279 | { | |
280 | unsigned int payload_len; | |
281 | ovs_be32 header_be; | |
282 | uint32_t header; | |
283 | ||
284 | if (match_len < 4) { | |
285 | if (match_len) { | |
286 | VLOG_DBG_RL(&rl, "nx_match ends with partial nxm_header"); | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | memcpy(&header_be, p, 4); | |
291 | header = ntohl(header_be); | |
292 | ||
293 | payload_len = NXM_LENGTH(header); | |
294 | if (!payload_len) { | |
295 | VLOG_DBG_RL(&rl, "nxm_entry %08"PRIx32" has invalid payload " | |
296 | "length 0", header); | |
297 | return 0; | |
298 | } | |
299 | if (match_len < payload_len + 4) { | |
300 | VLOG_DBG_RL(&rl, "%"PRIu32"-byte nxm_entry but only " | |
301 | "%u bytes left in nx_match", payload_len + 4, match_len); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | return header; | |
306 | } | |
307 | ||
308 | int | |
309 | nx_pull_match(struct ofpbuf *b, unsigned int match_len, uint16_t priority, | |
310 | struct cls_rule *rule) | |
311 | { | |
312 | uint32_t header; | |
313 | uint8_t *p; | |
314 | ||
315 | p = ofpbuf_try_pull(b, ROUND_UP(match_len, 8)); | |
316 | if (!p) { | |
317 | VLOG_DBG_RL(&rl, "nx_match length %zu, rounded up to a " | |
318 | "multiple of 8, is longer than space in message (max " | |
319 | "length %zu)", match_len, b->size); | |
320 | return ofp_mkerr(OFPET_BAD_REQUEST, OFPBRC_BAD_LEN); | |
321 | } | |
322 | ||
323 | cls_rule_init_catchall(rule, priority); | |
324 | while ((header = nx_entry_ok(p, match_len)) != 0) { | |
325 | unsigned length = NXM_LENGTH(header); | |
326 | const struct nxm_field *f; | |
327 | int error; | |
328 | ||
329 | f = nxm_field_lookup(header); | |
330 | if (!f) { | |
331 | error = NXM_BAD_TYPE; | |
332 | } else if (!nxm_prereqs_ok(f, &rule->flow)) { | |
333 | error = NXM_BAD_PREREQ; | |
334 | } else if (f->wildcard && !(rule->wc.wildcards & f->wildcard)) { | |
335 | error = NXM_DUP_TYPE; | |
336 | } else { | |
337 | /* 'hasmask' and 'length' are known to be correct at this point | |
338 | * because they are included in 'header' and nxm_field_lookup() | |
339 | * checked them already. */ | |
340 | rule->wc.wildcards &= ~f->wildcard; | |
341 | error = parse_nxm_entry(rule, f, p + 4, p + 4 + length / 2); | |
342 | } | |
343 | if (error) { | |
344 | VLOG_DBG_RL(&rl, "bad nxm_entry with vendor=%"PRIu32", " | |
345 | "field=%"PRIu32", hasmask=%"PRIu32", type=%"PRIu32" " | |
346 | "(error %x)", | |
347 | NXM_VENDOR(header), NXM_FIELD(header), | |
348 | NXM_HASMASK(header), NXM_TYPE(header), | |
349 | error); | |
350 | return error; | |
351 | } | |
352 | ||
353 | ||
354 | p += 4 + length; | |
355 | match_len -= 4 + length; | |
356 | } | |
357 | ||
358 | return match_len ? NXM_INVALID : 0; | |
359 | } | |
360 | \f | |
361 | /* nx_put_match() and helpers. | |
362 | * | |
363 | * 'put' functions whose names end in 'w' add a wildcarded field. | |
364 | * 'put' functions whose names end in 'm' add a field that might be wildcarded. | |
365 | * Other 'put' functions add exact-match fields. | |
366 | */ | |
367 | ||
368 | static void | |
369 | nxm_put_header(struct ofpbuf *b, uint32_t header) | |
370 | { | |
371 | ovs_be32 n_header = htonl(header); | |
372 | ofpbuf_put(b, &n_header, sizeof n_header); | |
373 | } | |
374 | ||
375 | static void | |
376 | nxm_put_8(struct ofpbuf *b, uint32_t header, uint8_t value) | |
377 | { | |
378 | nxm_put_header(b, header); | |
379 | ofpbuf_put(b, &value, sizeof value); | |
380 | } | |
381 | ||
382 | static void | |
383 | nxm_put_16(struct ofpbuf *b, uint32_t header, ovs_be16 value) | |
384 | { | |
385 | nxm_put_header(b, header); | |
386 | ofpbuf_put(b, &value, sizeof value); | |
387 | } | |
388 | ||
389 | static void | |
390 | nxm_put_16w(struct ofpbuf *b, uint32_t header, ovs_be16 value, ovs_be16 mask) | |
391 | { | |
392 | nxm_put_header(b, header); | |
393 | ofpbuf_put(b, &value, sizeof value); | |
394 | ofpbuf_put(b, &mask, sizeof mask); | |
395 | } | |
396 | ||
397 | static void | |
398 | nxm_put_32(struct ofpbuf *b, uint32_t header, ovs_be32 value) | |
399 | { | |
400 | nxm_put_header(b, header); | |
401 | ofpbuf_put(b, &value, sizeof value); | |
402 | } | |
403 | ||
404 | static void | |
405 | nxm_put_32w(struct ofpbuf *b, uint32_t header, ovs_be32 value, ovs_be32 mask) | |
406 | { | |
407 | nxm_put_header(b, header); | |
408 | ofpbuf_put(b, &value, sizeof value); | |
409 | ofpbuf_put(b, &mask, sizeof mask); | |
410 | } | |
411 | ||
412 | static void | |
413 | nxm_put_32m(struct ofpbuf *b, uint32_t header, ovs_be32 value, ovs_be32 mask) | |
414 | { | |
415 | switch (mask) { | |
416 | case 0: | |
417 | break; | |
418 | ||
419 | case UINT32_MAX: | |
420 | nxm_put_32(b, header, value); | |
421 | break; | |
422 | ||
423 | default: | |
424 | nxm_put_32w(b, NXM_MAKE_WILD_HEADER(header), value, mask); | |
425 | break; | |
426 | } | |
427 | } | |
428 | ||
429 | static void | |
430 | nxm_put_64(struct ofpbuf *b, uint32_t header, ovs_be64 value) | |
431 | { | |
432 | nxm_put_header(b, header); | |
433 | ofpbuf_put(b, &value, sizeof value); | |
434 | } | |
435 | ||
436 | ||
437 | static void | |
438 | nxm_put_eth(struct ofpbuf *b, uint32_t header, | |
439 | const uint8_t value[ETH_ADDR_LEN]) | |
440 | { | |
441 | nxm_put_header(b, header); | |
442 | ofpbuf_put(b, value, ETH_ADDR_LEN); | |
443 | } | |
444 | ||
445 | int | |
446 | nx_put_match(struct ofpbuf *b, const struct cls_rule *cr) | |
447 | { | |
448 | const uint32_t wc = cr->wc.wildcards; | |
449 | const struct flow *flow = &cr->flow; | |
450 | const size_t start_len = b->size; | |
451 | ovs_be16 vid, pcp; | |
452 | int match_len; | |
453 | ||
454 | /* Metadata. */ | |
455 | if (!(wc & OFPFW_IN_PORT)) { | |
456 | uint16_t in_port = flow->in_port; | |
457 | if (in_port == ODPP_LOCAL) { | |
458 | in_port = OFPP_LOCAL; | |
459 | } | |
460 | nxm_put_16(b, NXM_OF_IN_PORT, htons(in_port)); | |
461 | } | |
462 | ||
463 | /* Ethernet. */ | |
464 | if (!(wc & OFPFW_DL_DST)) { | |
465 | nxm_put_eth(b, NXM_OF_ETH_DST, flow->dl_dst); | |
466 | } | |
467 | if (!(wc & OFPFW_DL_SRC)) { | |
468 | nxm_put_eth(b, NXM_OF_ETH_SRC, flow->dl_src); | |
469 | } | |
470 | if (!(wc & OFPFW_DL_TYPE)) { | |
471 | nxm_put_16(b, NXM_OF_ETH_TYPE, flow->dl_type); | |
472 | } | |
473 | ||
474 | /* 802.1Q. */ | |
475 | vid = flow->dl_vlan & htons(VLAN_VID_MASK); | |
476 | pcp = htons((flow->dl_vlan_pcp << VLAN_PCP_SHIFT) & VLAN_PCP_MASK); | |
477 | switch (wc & (OFPFW_DL_VLAN | OFPFW_DL_VLAN_PCP)) { | |
478 | case OFPFW_DL_VLAN | OFPFW_DL_VLAN_PCP: | |
479 | break; | |
480 | case OFPFW_DL_VLAN: | |
481 | nxm_put_16w(b, NXM_OF_VLAN_TCI_W, pcp | htons(VLAN_CFI), | |
482 | htons(VLAN_PCP_MASK | VLAN_CFI)); | |
483 | break; | |
484 | case OFPFW_DL_VLAN_PCP: | |
485 | if (flow->dl_vlan == htons(OFP_VLAN_NONE)) { | |
486 | nxm_put_16(b, NXM_OF_VLAN_TCI, 0); | |
487 | } else { | |
488 | nxm_put_16w(b, NXM_OF_VLAN_TCI_W, vid | htons(VLAN_CFI), | |
489 | htons(VLAN_VID_MASK | VLAN_CFI)); | |
490 | } | |
491 | break; | |
492 | case 0: | |
493 | if (flow->dl_vlan == htons(OFP_VLAN_NONE)) { | |
494 | nxm_put_16(b, NXM_OF_VLAN_TCI, 0); | |
495 | } else { | |
496 | nxm_put_16(b, NXM_OF_VLAN_TCI, vid | pcp | htons(VLAN_CFI)); | |
497 | } | |
498 | break; | |
499 | } | |
500 | ||
501 | if (!(wc & OFPFW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IP)) { | |
502 | /* IP. */ | |
503 | if (!(wc & OFPFW_NW_TOS)) { | |
504 | nxm_put_8(b, NXM_OF_IP_TOS, flow->nw_tos & 0xfc); | |
505 | } | |
506 | nxm_put_32m(b, NXM_OF_IP_SRC, flow->nw_src, cr->wc.nw_src_mask); | |
507 | nxm_put_32m(b, NXM_OF_IP_DST, flow->nw_dst, cr->wc.nw_dst_mask); | |
508 | ||
509 | if (!(wc & OFPFW_NW_PROTO)) { | |
510 | nxm_put_8(b, NXM_OF_IP_PROTO, flow->nw_proto); | |
511 | switch (flow->nw_proto) { | |
512 | /* TCP. */ | |
513 | case IP_TYPE_TCP: | |
514 | if (!(wc & OFPFW_TP_SRC)) { | |
515 | nxm_put_16(b, NXM_OF_TCP_SRC, flow->tp_src); | |
516 | } | |
517 | if (!(wc & OFPFW_TP_DST)) { | |
518 | nxm_put_16(b, NXM_OF_TCP_DST, flow->tp_dst); | |
519 | } | |
520 | break; | |
521 | ||
522 | /* UDP. */ | |
523 | case IP_TYPE_UDP: | |
524 | if (!(wc & OFPFW_TP_SRC)) { | |
525 | nxm_put_16(b, NXM_OF_UDP_SRC, flow->tp_src); | |
526 | } | |
527 | if (!(wc & OFPFW_TP_DST)) { | |
528 | nxm_put_16(b, NXM_OF_UDP_DST, flow->tp_dst); | |
529 | } | |
530 | break; | |
531 | ||
532 | /* ICMP. */ | |
533 | case IP_TYPE_ICMP: | |
534 | if (!(wc & OFPFW_TP_SRC)) { | |
535 | nxm_put_8(b, NXM_OF_ICMP_TYPE, ntohs(flow->tp_src)); | |
536 | } | |
537 | if (!(wc & OFPFW_TP_DST)) { | |
538 | nxm_put_8(b, NXM_OF_ICMP_CODE, ntohs(flow->tp_dst)); | |
539 | } | |
540 | break; | |
541 | } | |
542 | } | |
543 | } else if (!(wc & OFPFW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_ARP)) { | |
544 | /* ARP. */ | |
545 | if (!(wc & OFPFW_NW_PROTO)) { | |
546 | nxm_put_16(b, NXM_OF_ARP_OP, htons(flow->nw_proto)); | |
547 | } | |
548 | nxm_put_32m(b, NXM_OF_ARP_SPA, flow->nw_src, cr->wc.nw_src_mask); | |
549 | nxm_put_32m(b, NXM_OF_ARP_TPA, flow->nw_dst, cr->wc.nw_dst_mask); | |
550 | } | |
551 | ||
552 | /* Tunnel ID. */ | |
553 | if (!(wc & NXFW_TUN_ID)) { | |
554 | nxm_put_64(b, NXM_NX_TUN_ID, htonll(ntohl(flow->tun_id))); | |
555 | } | |
556 | ||
557 | match_len = b->size - start_len; | |
558 | ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len); | |
559 | return match_len; | |
560 | } | |
561 | \f | |
562 | /* nx_match_to_string() and helpers. */ | |
563 | ||
564 | char * | |
565 | nx_match_to_string(const uint8_t *p, unsigned int match_len) | |
566 | { | |
567 | uint32_t header; | |
568 | struct ds s; | |
569 | ||
570 | if (!match_len) { | |
571 | return xstrdup("<any>"); | |
572 | } | |
573 | ||
574 | ds_init(&s); | |
575 | while ((header = nx_entry_ok(p, match_len)) != 0) { | |
576 | unsigned int length = NXM_LENGTH(header); | |
577 | unsigned int value_len = nxm_field_bytes(header); | |
578 | const uint8_t *value = p + 4; | |
579 | const uint8_t *mask = value + value_len; | |
580 | const struct nxm_field *f; | |
581 | unsigned int i; | |
582 | ||
583 | if (s.length) { | |
584 | ds_put_cstr(&s, ", "); | |
585 | } | |
586 | ||
587 | f = nxm_field_lookup(header); | |
588 | if (f) { | |
589 | ds_put_cstr(&s, f->name); | |
590 | } else { | |
591 | ds_put_format(&s, "%d:%d", NXM_VENDOR(header), NXM_FIELD(header)); | |
592 | } | |
593 | ||
594 | ds_put_char(&s, '('); | |
595 | ||
596 | for (i = 0; i < value_len; i++) { | |
597 | ds_put_format(&s, "%02x", value[i]); | |
598 | } | |
599 | if (NXM_HASMASK(header)) { | |
600 | ds_put_char(&s, '/'); | |
601 | for (i = 0; i < value_len; i++) { | |
602 | ds_put_format(&s, "%02x", mask[i]); | |
603 | } | |
604 | } | |
605 | ds_put_char(&s, ')'); | |
606 | ||
607 | p += 4 + length; | |
608 | match_len -= 4 + length; | |
609 | } | |
610 | ||
611 | if (match_len) { | |
612 | if (s.length) { | |
613 | ds_put_cstr(&s, ", "); | |
614 | } | |
615 | ||
616 | ds_put_format(&s, "<%u invalid bytes>", match_len); | |
617 | } | |
618 | ||
619 | return ds_steal_cstr(&s); | |
620 | } | |
621 | ||
622 | static const struct nxm_field * | |
623 | lookup_nxm_field(const char *name, int name_len) | |
624 | { | |
625 | const struct nxm_field *f; | |
626 | ||
627 | for (f = nxm_fields; f < &nxm_fields[ARRAY_SIZE(nxm_fields)]; f++) { | |
628 | if (!strncmp(f->name, name, name_len) && f->name[name_len] == '\0') { | |
629 | return f; | |
630 | } | |
631 | } | |
632 | ||
633 | return NULL; | |
634 | } | |
635 | ||
636 | static const char * | |
637 | parse_hex_bytes(struct ofpbuf *b, const char *s, unsigned int n) | |
638 | { | |
639 | while (n--) { | |
640 | int low, high; | |
641 | uint8_t byte; | |
642 | ||
643 | s += strspn(s, " "); | |
644 | low = hexit_value(*s); | |
645 | high = low < 0 ? low : hexit_value(s[1]); | |
646 | if (low < 0 || high < 0) { | |
647 | ovs_fatal(0, "%.2s: hex digits expected", s); | |
648 | } | |
649 | ||
650 | byte = 16 * low + high; | |
651 | ofpbuf_put(b, &byte, 1); | |
652 | s += 2; | |
653 | } | |
654 | return s; | |
655 | } | |
656 | \f | |
657 | /* nx_match_from_string(). */ | |
658 | ||
659 | int | |
660 | nx_match_from_string(const char *s, struct ofpbuf *b) | |
661 | { | |
662 | const char *full_s = s; | |
663 | const size_t start_len = b->size; | |
664 | int match_len; | |
665 | ||
666 | if (!strcmp(s, "<any>")) { | |
667 | /* Ensure that 'b->data' isn't actually null. */ | |
668 | ofpbuf_prealloc_tailroom(b, 1); | |
669 | return 0; | |
670 | } | |
671 | ||
672 | for (s += strspn(s, ", "); *s; s += strspn(s, ", ")) { | |
673 | const struct nxm_field *f; | |
674 | int name_len; | |
675 | ||
676 | name_len = strcspn(s, "("); | |
677 | if (s[name_len] != '(') { | |
678 | ovs_fatal(0, "%s: missing ( at end of nx_match", full_s); | |
679 | } | |
680 | ||
681 | f = lookup_nxm_field(s, name_len); | |
682 | if (!f) { | |
683 | ovs_fatal(0, "%s: unknown field `%.*s'", full_s, name_len, s); | |
684 | } | |
685 | ||
686 | s += name_len + 1; | |
687 | ||
688 | nxm_put_header(b, f->header); | |
689 | s = parse_hex_bytes(b, s, nxm_field_bytes(f->header)); | |
690 | if (NXM_HASMASK(f->header)) { | |
691 | s += strspn(s, " "); | |
692 | if (*s != '/') { | |
693 | ovs_fatal(0, "%s: missing / in masked field %s", | |
694 | full_s, f->name); | |
695 | } | |
696 | s = parse_hex_bytes(b, s + 1, nxm_field_bytes(f->header)); | |
697 | } | |
698 | ||
699 | s += strspn(s, " "); | |
700 | if (*s != ')') { | |
701 | ovs_fatal(0, "%s: missing ) following field %s", full_s, f->name); | |
702 | } | |
703 | s++; | |
704 | } | |
705 | ||
706 | match_len = b->size - start_len; | |
707 | ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len); | |
708 | return match_len; | |
709 | } |