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09246b99 | 1 | /* |
e0edde6f | 2 | * Copyright (c) 2010, 2011, 2012 Nicira, Inc. |
09246b99 BP |
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 | ||
685a51a5 JP |
21 | #include <netinet/icmp6.h> |
22 | ||
09246b99 BP |
23 | #include "classifier.h" |
24 | #include "dynamic-string.h" | |
6a885fd0 | 25 | #include "meta-flow.h" |
90bf1e07 | 26 | #include "ofp-errors.h" |
09246b99 BP |
27 | #include "ofp-util.h" |
28 | #include "ofpbuf.h" | |
29 | #include "openflow/nicira-ext.h" | |
30 | #include "packets.h" | |
31 | #include "unaligned.h" | |
ddc4f8e2 | 32 | #include "util.h" |
09246b99 BP |
33 | #include "vlog.h" |
34 | ||
35 | VLOG_DEFINE_THIS_MODULE(nx_match); | |
36 | ||
37 | /* Rate limit for nx_match parse errors. These always indicate a bug in the | |
38 | * peer and so there's not much point in showing a lot of them. */ | |
39 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); | |
40 | ||
09246b99 BP |
41 | /* Returns the width of the data for a field with the given 'header', in |
42 | * bytes. */ | |
4291acd2 | 43 | int |
09246b99 BP |
44 | nxm_field_bytes(uint32_t header) |
45 | { | |
46 | unsigned int length = NXM_LENGTH(header); | |
47 | return NXM_HASMASK(header) ? length / 2 : length; | |
48 | } | |
b6c9e612 BP |
49 | |
50 | /* Returns the width of the data for a field with the given 'header', in | |
51 | * bits. */ | |
4291acd2 | 52 | int |
b6c9e612 BP |
53 | nxm_field_bits(uint32_t header) |
54 | { | |
55 | return nxm_field_bytes(header) * 8; | |
56 | } | |
6a885fd0 BP |
57 | \f |
58 | /* nx_pull_match() and helpers. */ | |
09246b99 BP |
59 | |
60 | static uint32_t | |
61 | nx_entry_ok(const void *p, unsigned int match_len) | |
62 | { | |
63 | unsigned int payload_len; | |
64 | ovs_be32 header_be; | |
65 | uint32_t header; | |
66 | ||
67 | if (match_len < 4) { | |
68 | if (match_len) { | |
69 | VLOG_DBG_RL(&rl, "nx_match ends with partial nxm_header"); | |
70 | } | |
71 | return 0; | |
72 | } | |
73 | memcpy(&header_be, p, 4); | |
74 | header = ntohl(header_be); | |
75 | ||
76 | payload_len = NXM_LENGTH(header); | |
77 | if (!payload_len) { | |
78 | VLOG_DBG_RL(&rl, "nxm_entry %08"PRIx32" has invalid payload " | |
79 | "length 0", header); | |
80 | return 0; | |
81 | } | |
82 | if (match_len < payload_len + 4) { | |
83 | VLOG_DBG_RL(&rl, "%"PRIu32"-byte nxm_entry but only " | |
84 | "%u bytes left in nx_match", payload_len + 4, match_len); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | return header; | |
89 | } | |
90 | ||
90bf1e07 | 91 | static enum ofperr |
102ce766 EJ |
92 | nx_pull_match__(struct ofpbuf *b, unsigned int match_len, bool strict, |
93 | uint16_t priority, struct cls_rule *rule, | |
94 | ovs_be64 *cookie, ovs_be64 *cookie_mask) | |
09246b99 BP |
95 | { |
96 | uint32_t header; | |
97 | uint8_t *p; | |
98 | ||
e729e793 JP |
99 | assert((cookie != NULL) == (cookie_mask != NULL)); |
100 | ||
09246b99 BP |
101 | p = ofpbuf_try_pull(b, ROUND_UP(match_len, 8)); |
102 | if (!p) { | |
e5fccb40 | 103 | VLOG_DBG_RL(&rl, "nx_match length %u, rounded up to a " |
09246b99 BP |
104 | "multiple of 8, is longer than space in message (max " |
105 | "length %zu)", match_len, b->size); | |
2e0525bc | 106 | return OFPERR_OFPBMC_BAD_LEN; |
09246b99 BP |
107 | } |
108 | ||
109 | cls_rule_init_catchall(rule, priority); | |
e729e793 JP |
110 | if (cookie) { |
111 | *cookie = *cookie_mask = htonll(0); | |
112 | } | |
102ce766 EJ |
113 | for (; |
114 | (header = nx_entry_ok(p, match_len)) != 0; | |
115 | p += 4 + NXM_LENGTH(header), match_len -= 4 + NXM_LENGTH(header)) { | |
28da1f8f | 116 | const struct mf_field *mf; |
90bf1e07 | 117 | enum ofperr error; |
09246b99 | 118 | |
28da1f8f BP |
119 | mf = mf_from_nxm_header(header); |
120 | if (!mf) { | |
102ce766 | 121 | if (strict) { |
2e0525bc | 122 | error = OFPERR_OFPBMC_BAD_FIELD; |
102ce766 EJ |
123 | } else { |
124 | continue; | |
125 | } | |
28da1f8f | 126 | } else if (!mf_are_prereqs_ok(mf, &rule->flow)) { |
2e0525bc | 127 | error = OFPERR_OFPBMC_BAD_PREREQ; |
28da1f8f | 128 | } else if (!mf_is_all_wild(mf, &rule->wc)) { |
2e0525bc | 129 | error = OFPERR_OFPBMC_DUP_FIELD; |
b5ae8913 | 130 | } else if (header != OXM_OF_IN_PORT) { |
28da1f8f | 131 | unsigned int width = mf->n_bytes; |
6a885fd0 BP |
132 | union mf_value value; |
133 | ||
134 | memcpy(&value, p + 4, width); | |
28da1f8f | 135 | if (!mf_is_value_valid(mf, &value)) { |
2e0525bc | 136 | error = OFPERR_OFPBMC_BAD_VALUE; |
6a885fd0 BP |
137 | } else if (!NXM_HASMASK(header)) { |
138 | error = 0; | |
28da1f8f | 139 | mf_set_value(mf, &value, rule); |
6a885fd0 BP |
140 | } else { |
141 | union mf_value mask; | |
142 | ||
143 | memcpy(&mask, p + 4 + width, width); | |
28da1f8f | 144 | if (!mf_is_mask_valid(mf, &mask)) { |
2e0525bc | 145 | error = OFPERR_OFPBMC_BAD_MASK; |
6a885fd0 BP |
146 | } else { |
147 | error = 0; | |
28da1f8f | 148 | mf_set(mf, &value, &mask, rule); |
6a885fd0 BP |
149 | } |
150 | } | |
b5ae8913 SH |
151 | } else { |
152 | /* Special case for 32bit ports when using OXM, | |
153 | * ports are 16 bits wide otherwise. */ | |
154 | ovs_be32 port_of11; | |
155 | uint16_t port; | |
156 | ||
157 | memcpy(&port_of11, p + 4, sizeof port_of11); | |
158 | error = ofputil_port_from_ofp11(port_of11, &port); | |
159 | if (!error) { | |
160 | cls_rule_set_in_port(rule, port); | |
161 | } | |
09246b99 | 162 | } |
6a885fd0 | 163 | |
e729e793 JP |
164 | /* Check if the match is for a cookie rather than a classifier rule. */ |
165 | if ((header == NXM_NX_COOKIE || header == NXM_NX_COOKIE_W) && cookie) { | |
166 | if (*cookie_mask) { | |
2e0525bc | 167 | error = OFPERR_OFPBMC_DUP_FIELD; |
e729e793 JP |
168 | } else { |
169 | unsigned int width = sizeof *cookie; | |
170 | ||
171 | memcpy(cookie, p + 4, width); | |
172 | if (NXM_HASMASK(header)) { | |
173 | memcpy(cookie_mask, p + 4 + width, width); | |
174 | } else { | |
175 | *cookie_mask = htonll(UINT64_MAX); | |
176 | } | |
177 | error = 0; | |
178 | } | |
179 | } | |
180 | ||
09246b99 | 181 | if (error) { |
28da1f8f BP |
182 | VLOG_DBG_RL(&rl, "bad nxm_entry %#08"PRIx32" (vendor=%"PRIu32", " |
183 | "field=%"PRIu32", hasmask=%"PRIu32", len=%"PRIu32"), " | |
184 | "(%s)", header, | |
09246b99 | 185 | NXM_VENDOR(header), NXM_FIELD(header), |
28da1f8f | 186 | NXM_HASMASK(header), NXM_LENGTH(header), |
90bf1e07 | 187 | ofperr_to_string(error)); |
09246b99 BP |
188 | return error; |
189 | } | |
09246b99 BP |
190 | } |
191 | ||
2e0525bc | 192 | return match_len ? OFPERR_OFPBMC_BAD_LEN : 0; |
09246b99 | 193 | } |
102ce766 EJ |
194 | |
195 | /* Parses the nx_match formatted match description in 'b' with length | |
196 | * 'match_len'. The results are stored in 'rule', which is initialized with | |
197 | * 'priority'. If 'cookie' and 'cookie_mask' contain valid pointers, then the | |
198 | * cookie and mask will be stored in them if a "NXM_NX_COOKIE*" match is | |
199 | * defined. Otherwise, 0 is stored in both. | |
200 | * | |
201 | * Fails with an error when encountering unknown NXM headers. | |
202 | * | |
203 | * Returns 0 if successful, otherwise an OpenFlow error code. */ | |
90bf1e07 | 204 | enum ofperr |
102ce766 EJ |
205 | nx_pull_match(struct ofpbuf *b, unsigned int match_len, |
206 | uint16_t priority, struct cls_rule *rule, | |
207 | ovs_be64 *cookie, ovs_be64 *cookie_mask) | |
208 | { | |
209 | return nx_pull_match__(b, match_len, true, priority, rule, cookie, | |
210 | cookie_mask); | |
211 | } | |
212 | ||
213 | /* Behaves the same as nx_pull_match() with one exception. Skips over unknown | |
214 | * NXM headers instead of failing with an error when they are encountered. */ | |
90bf1e07 | 215 | enum ofperr |
102ce766 EJ |
216 | nx_pull_match_loose(struct ofpbuf *b, unsigned int match_len, |
217 | uint16_t priority, struct cls_rule *rule, | |
218 | ovs_be64 *cookie, ovs_be64 *cookie_mask) | |
219 | { | |
220 | return nx_pull_match__(b, match_len, false, priority, rule, cookie, | |
221 | cookie_mask); | |
222 | } | |
09246b99 BP |
223 | \f |
224 | /* nx_put_match() and helpers. | |
225 | * | |
226 | * 'put' functions whose names end in 'w' add a wildcarded field. | |
227 | * 'put' functions whose names end in 'm' add a field that might be wildcarded. | |
228 | * Other 'put' functions add exact-match fields. | |
229 | */ | |
230 | ||
231 | static void | |
232 | nxm_put_header(struct ofpbuf *b, uint32_t header) | |
233 | { | |
234 | ovs_be32 n_header = htonl(header); | |
235 | ofpbuf_put(b, &n_header, sizeof n_header); | |
236 | } | |
237 | ||
238 | static void | |
239 | nxm_put_8(struct ofpbuf *b, uint32_t header, uint8_t value) | |
240 | { | |
241 | nxm_put_header(b, header); | |
242 | ofpbuf_put(b, &value, sizeof value); | |
243 | } | |
244 | ||
7257b535 BP |
245 | static void |
246 | nxm_put_8m(struct ofpbuf *b, uint32_t header, uint8_t value, uint8_t mask) | |
247 | { | |
248 | switch (mask) { | |
249 | case 0: | |
250 | break; | |
251 | ||
252 | case UINT8_MAX: | |
253 | nxm_put_8(b, header, value); | |
254 | break; | |
255 | ||
256 | default: | |
257 | nxm_put_header(b, NXM_MAKE_WILD_HEADER(header)); | |
258 | ofpbuf_put(b, &value, sizeof value); | |
259 | ofpbuf_put(b, &mask, sizeof mask); | |
260 | } | |
261 | } | |
262 | ||
09246b99 BP |
263 | static void |
264 | nxm_put_16(struct ofpbuf *b, uint32_t header, ovs_be16 value) | |
265 | { | |
266 | nxm_put_header(b, header); | |
267 | ofpbuf_put(b, &value, sizeof value); | |
268 | } | |
269 | ||
270 | static void | |
271 | nxm_put_16w(struct ofpbuf *b, uint32_t header, ovs_be16 value, ovs_be16 mask) | |
272 | { | |
273 | nxm_put_header(b, header); | |
274 | ofpbuf_put(b, &value, sizeof value); | |
275 | ofpbuf_put(b, &mask, sizeof mask); | |
276 | } | |
277 | ||
66642cb4 BP |
278 | static void |
279 | nxm_put_16m(struct ofpbuf *b, uint32_t header, ovs_be16 value, ovs_be16 mask) | |
280 | { | |
281 | switch (mask) { | |
282 | case 0: | |
283 | break; | |
284 | ||
285 | case CONSTANT_HTONS(UINT16_MAX): | |
286 | nxm_put_16(b, header, value); | |
287 | break; | |
288 | ||
289 | default: | |
290 | nxm_put_16w(b, NXM_MAKE_WILD_HEADER(header), value, mask); | |
291 | break; | |
292 | } | |
293 | } | |
294 | ||
09246b99 BP |
295 | static void |
296 | nxm_put_32(struct ofpbuf *b, uint32_t header, ovs_be32 value) | |
297 | { | |
298 | nxm_put_header(b, header); | |
299 | ofpbuf_put(b, &value, sizeof value); | |
300 | } | |
301 | ||
302 | static void | |
303 | nxm_put_32w(struct ofpbuf *b, uint32_t header, ovs_be32 value, ovs_be32 mask) | |
304 | { | |
305 | nxm_put_header(b, header); | |
306 | ofpbuf_put(b, &value, sizeof value); | |
307 | ofpbuf_put(b, &mask, sizeof mask); | |
308 | } | |
309 | ||
310 | static void | |
311 | nxm_put_32m(struct ofpbuf *b, uint32_t header, ovs_be32 value, ovs_be32 mask) | |
312 | { | |
313 | switch (mask) { | |
314 | case 0: | |
315 | break; | |
316 | ||
66642cb4 | 317 | case CONSTANT_HTONL(UINT32_MAX): |
09246b99 BP |
318 | nxm_put_32(b, header, value); |
319 | break; | |
320 | ||
321 | default: | |
322 | nxm_put_32w(b, NXM_MAKE_WILD_HEADER(header), value, mask); | |
323 | break; | |
324 | } | |
325 | } | |
326 | ||
327 | static void | |
328 | nxm_put_64(struct ofpbuf *b, uint32_t header, ovs_be64 value) | |
329 | { | |
330 | nxm_put_header(b, header); | |
331 | ofpbuf_put(b, &value, sizeof value); | |
332 | } | |
333 | ||
8368c090 BP |
334 | static void |
335 | nxm_put_64w(struct ofpbuf *b, uint32_t header, ovs_be64 value, ovs_be64 mask) | |
336 | { | |
337 | nxm_put_header(b, header); | |
338 | ofpbuf_put(b, &value, sizeof value); | |
339 | ofpbuf_put(b, &mask, sizeof mask); | |
340 | } | |
341 | ||
342 | static void | |
343 | nxm_put_64m(struct ofpbuf *b, uint32_t header, ovs_be64 value, ovs_be64 mask) | |
344 | { | |
345 | switch (mask) { | |
346 | case 0: | |
347 | break; | |
348 | ||
349 | case CONSTANT_HTONLL(UINT64_MAX): | |
350 | nxm_put_64(b, header, value); | |
351 | break; | |
352 | ||
353 | default: | |
354 | nxm_put_64w(b, NXM_MAKE_WILD_HEADER(header), value, mask); | |
355 | break; | |
356 | } | |
357 | } | |
358 | ||
09246b99 BP |
359 | static void |
360 | nxm_put_eth(struct ofpbuf *b, uint32_t header, | |
361 | const uint8_t value[ETH_ADDR_LEN]) | |
362 | { | |
363 | nxm_put_header(b, header); | |
364 | ofpbuf_put(b, value, ETH_ADDR_LEN); | |
365 | } | |
366 | ||
1e37a2d7 | 367 | static void |
73c0ce34 JS |
368 | nxm_put_eth_masked(struct ofpbuf *b, uint32_t header, |
369 | const uint8_t value[ETH_ADDR_LEN], | |
370 | const uint8_t mask[ETH_ADDR_LEN]) | |
1e37a2d7 | 371 | { |
73c0ce34 JS |
372 | if (!eth_addr_is_zero(mask)) { |
373 | if (eth_mask_is_exact(mask)) { | |
374 | nxm_put_eth(b, header, value); | |
375 | } else { | |
376 | nxm_put_header(b, NXM_MAKE_WILD_HEADER(header)); | |
377 | ofpbuf_put(b, value, ETH_ADDR_LEN); | |
378 | ofpbuf_put(b, mask, ETH_ADDR_LEN); | |
379 | } | |
1e37a2d7 BP |
380 | } |
381 | } | |
382 | ||
d31f1109 JP |
383 | static void |
384 | nxm_put_ipv6(struct ofpbuf *b, uint32_t header, | |
385 | const struct in6_addr *value, const struct in6_addr *mask) | |
386 | { | |
387 | if (ipv6_mask_is_any(mask)) { | |
388 | return; | |
389 | } else if (ipv6_mask_is_exact(mask)) { | |
390 | nxm_put_header(b, header); | |
391 | ofpbuf_put(b, value, sizeof *value); | |
392 | } else { | |
393 | nxm_put_header(b, NXM_MAKE_WILD_HEADER(header)); | |
394 | ofpbuf_put(b, value, sizeof *value); | |
395 | ofpbuf_put(b, mask, sizeof *mask); | |
396 | } | |
397 | } | |
398 | ||
7257b535 | 399 | static void |
9e44d715 | 400 | nxm_put_frag(struct ofpbuf *b, const struct cls_rule *cr) |
7257b535 | 401 | { |
eadef313 JP |
402 | uint8_t nw_frag = cr->flow.nw_frag; |
403 | uint8_t nw_frag_mask = cr->wc.nw_frag_mask; | |
7257b535 | 404 | |
eadef313 | 405 | switch (nw_frag_mask) { |
7257b535 BP |
406 | case 0: |
407 | break; | |
408 | ||
eadef313 JP |
409 | case FLOW_NW_FRAG_MASK: |
410 | nxm_put_8(b, NXM_NX_IP_FRAG, nw_frag); | |
7257b535 BP |
411 | break; |
412 | ||
413 | default: | |
eadef313 JP |
414 | nxm_put_8m(b, NXM_NX_IP_FRAG, nw_frag, |
415 | nw_frag_mask & FLOW_NW_FRAG_MASK); | |
7257b535 BP |
416 | break; |
417 | } | |
418 | } | |
419 | ||
8e7082b0 BP |
420 | static void |
421 | nxm_put_ip(struct ofpbuf *b, const struct cls_rule *cr, | |
b5ae8913 SH |
422 | uint8_t icmp_proto, uint32_t icmp_type, uint32_t icmp_code, |
423 | bool oxm) | |
8e7082b0 BP |
424 | { |
425 | const flow_wildcards_t wc = cr->wc.wildcards; | |
426 | const struct flow *flow = &cr->flow; | |
427 | ||
428 | nxm_put_frag(b, cr); | |
429 | ||
430 | if (!(wc & FWW_NW_DSCP)) { | |
b5ae8913 SH |
431 | nxm_put_8(b, oxm ? OXM_OF_IP_DSCP : NXM_OF_IP_TOS, |
432 | flow->nw_tos & IP_DSCP_MASK); | |
8e7082b0 BP |
433 | } |
434 | ||
435 | if (!(wc & FWW_NW_ECN)) { | |
b5ae8913 SH |
436 | nxm_put_8(b, oxm ? OXM_OF_IP_ECN : NXM_NX_IP_ECN, |
437 | flow->nw_tos & IP_ECN_MASK); | |
8e7082b0 BP |
438 | } |
439 | ||
b5ae8913 | 440 | if (!oxm && !(wc & FWW_NW_TTL)) { |
8e7082b0 BP |
441 | nxm_put_8(b, NXM_NX_IP_TTL, flow->nw_ttl); |
442 | } | |
443 | ||
444 | if (!(wc & FWW_NW_PROTO)) { | |
b5ae8913 | 445 | nxm_put_8(b, oxm ? OXM_OF_IP_PROTO : NXM_OF_IP_PROTO, flow->nw_proto); |
8e7082b0 BP |
446 | |
447 | if (flow->nw_proto == IPPROTO_TCP) { | |
b5ae8913 SH |
448 | nxm_put_16m(b, oxm ? OXM_OF_TCP_SRC : NXM_OF_TCP_SRC, |
449 | flow->tp_src, cr->wc.tp_src_mask); | |
450 | nxm_put_16m(b, oxm ? OXM_OF_TCP_DST : NXM_OF_TCP_DST, | |
451 | flow->tp_dst, cr->wc.tp_dst_mask); | |
8e7082b0 | 452 | } else if (flow->nw_proto == IPPROTO_UDP) { |
b5ae8913 SH |
453 | nxm_put_16m(b, oxm ? OXM_OF_UDP_SRC : NXM_OF_UDP_SRC, |
454 | flow->tp_src, cr->wc.tp_src_mask); | |
455 | nxm_put_16m(b, oxm ? OXM_OF_UDP_DST : NXM_OF_UDP_DST, | |
456 | flow->tp_dst, cr->wc.tp_dst_mask); | |
8e7082b0 | 457 | } else if (flow->nw_proto == icmp_proto) { |
73f33563 | 458 | if (cr->wc.tp_src_mask) { |
8e7082b0 BP |
459 | nxm_put_8(b, icmp_type, ntohs(flow->tp_src)); |
460 | } | |
73f33563 | 461 | if (cr->wc.tp_dst_mask) { |
8e7082b0 BP |
462 | nxm_put_8(b, icmp_code, ntohs(flow->tp_dst)); |
463 | } | |
464 | } | |
465 | } | |
466 | } | |
467 | ||
4d0ed519 BP |
468 | /* Appends to 'b' the nx_match format that expresses 'cr' (except for |
469 | * 'cr->priority', because priority is not part of nx_match), plus enough | |
e729e793 JP |
470 | * zero bytes to pad the nx_match out to a multiple of 8. For Flow Mod |
471 | * and Flow Stats Requests messages, a 'cookie' and 'cookie_mask' may be | |
472 | * supplied. Otherwise, 'cookie_mask' should be zero. | |
4d0ed519 BP |
473 | * |
474 | * This function can cause 'b''s data to be reallocated. | |
475 | * | |
476 | * Returns the number of bytes appended to 'b', excluding padding. | |
477 | * | |
478 | * If 'cr' is a catch-all rule that matches every packet, then this function | |
479 | * appends nothing to 'b' and returns 0. */ | |
09246b99 | 480 | int |
b5ae8913 | 481 | nx_put_match(struct ofpbuf *b, bool oxm, const struct cls_rule *cr, |
e729e793 | 482 | ovs_be64 cookie, ovs_be64 cookie_mask) |
09246b99 | 483 | { |
d8ae4d67 | 484 | const flow_wildcards_t wc = cr->wc.wildcards; |
09246b99 BP |
485 | const struct flow *flow = &cr->flow; |
486 | const size_t start_len = b->size; | |
09246b99 | 487 | int match_len; |
b6c9e612 | 488 | int i; |
09246b99 | 489 | |
73c0ce34 | 490 | BUILD_ASSERT_DECL(FLOW_WC_SEQ == 11); |
a877206f | 491 | |
09246b99 | 492 | /* Metadata. */ |
d8ae4d67 | 493 | if (!(wc & FWW_IN_PORT)) { |
09246b99 | 494 | uint16_t in_port = flow->in_port; |
b5ae8913 SH |
495 | if (oxm) { |
496 | nxm_put_32(b, OXM_OF_IN_PORT, ofputil_port_to_ofp11(in_port)); | |
497 | } else { | |
498 | nxm_put_16(b, NXM_OF_IN_PORT, htons(in_port)); | |
499 | } | |
09246b99 BP |
500 | } |
501 | ||
502 | /* Ethernet. */ | |
b5ae8913 SH |
503 | nxm_put_eth_masked(b, oxm ? OXM_OF_ETH_SRC : NXM_OF_ETH_SRC, |
504 | flow->dl_src, cr->wc.dl_src_mask); | |
505 | nxm_put_eth_masked(b, oxm ? OXM_OF_ETH_DST : NXM_OF_ETH_DST, | |
506 | flow->dl_dst, cr->wc.dl_dst_mask); | |
d8ae4d67 | 507 | if (!(wc & FWW_DL_TYPE)) { |
b5ae8913 | 508 | nxm_put_16(b, oxm ? OXM_OF_ETH_TYPE : NXM_OF_ETH_TYPE, |
36956a7d | 509 | ofputil_dl_type_to_openflow(flow->dl_type)); |
09246b99 BP |
510 | } |
511 | ||
b5ae8913 SH |
512 | /* 802.1Q. |
513 | * | |
514 | * XXX missing OXM support */ | |
66642cb4 | 515 | nxm_put_16m(b, NXM_OF_VLAN_TCI, flow->vlan_tci, cr->wc.vlan_tci_mask); |
09246b99 | 516 | |
66642cb4 | 517 | /* L3. */ |
d8ae4d67 | 518 | if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IP)) { |
09246b99 | 519 | /* IP. */ |
b5ae8913 SH |
520 | nxm_put_32m(b, oxm ? OXM_OF_IPV4_SRC : NXM_OF_IP_SRC, |
521 | flow->nw_src, cr->wc.nw_src_mask); | |
522 | nxm_put_32m(b, oxm ? OXM_OF_IPV4_DST : NXM_OF_IP_DST, | |
523 | flow->nw_dst, cr->wc.nw_dst_mask); | |
524 | nxm_put_ip(b, cr, IPPROTO_ICMP, | |
525 | oxm ? OXM_OF_ICMPV4_TYPE : NXM_OF_ICMP_TYPE, | |
526 | oxm ? OXM_OF_ICMPV4_CODE : NXM_OF_ICMP_CODE, oxm); | |
d31f1109 JP |
527 | } else if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IPV6)) { |
528 | /* IPv6. */ | |
b5ae8913 SH |
529 | nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_SRC : NXM_NX_IPV6_SRC, |
530 | &flow->ipv6_src, &cr->wc.ipv6_src_mask); | |
531 | nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_DST : NXM_NX_IPV6_DST, | |
532 | &flow->ipv6_dst, &cr->wc.ipv6_dst_mask); | |
533 | nxm_put_ip(b, cr, IPPROTO_ICMPV6, | |
534 | oxm ? OXM_OF_ICMPV6_TYPE : NXM_NX_ICMPV6_TYPE, | |
535 | oxm ? OXM_OF_ICMPV6_CODE : NXM_NX_ICMPV6_CODE, oxm); | |
9e44d715 | 536 | |
fa8223b7 | 537 | if (!(wc & FWW_IPV6_LABEL)) { |
b5ae8913 SH |
538 | nxm_put_32(b, oxm ? OXM_OF_IPV6_FLABEL : NXM_NX_IPV6_LABEL, |
539 | flow->ipv6_label); | |
fa8223b7 | 540 | } |
d31f1109 | 541 | |
8e7082b0 BP |
542 | if (flow->nw_proto == IPPROTO_ICMPV6 |
543 | && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) || | |
544 | flow->tp_src == htons(ND_NEIGHBOR_ADVERT))) { | |
b5ae8913 SH |
545 | nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_ND_TARGET : NXM_NX_ND_TARGET, |
546 | &flow->nd_target, &cr->wc.nd_target_mask); | |
8e7082b0 BP |
547 | if (!(wc & FWW_ARP_SHA) |
548 | && flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)) { | |
b5ae8913 SH |
549 | nxm_put_eth(b, oxm ? OXM_OF_IPV6_ND_SLL : NXM_NX_ND_SLL, |
550 | flow->arp_sha); | |
8e7082b0 BP |
551 | } |
552 | if (!(wc & FWW_ARP_THA) | |
553 | && flow->tp_src == htons(ND_NEIGHBOR_ADVERT)) { | |
b5ae8913 SH |
554 | nxm_put_eth(b, oxm ? OXM_OF_IPV6_ND_TLL : NXM_NX_ND_TLL, |
555 | flow->arp_tha); | |
d31f1109 JP |
556 | } |
557 | } | |
d8ae4d67 | 558 | } else if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_ARP)) { |
09246b99 | 559 | /* ARP. */ |
d8ae4d67 | 560 | if (!(wc & FWW_NW_PROTO)) { |
b5ae8913 SH |
561 | nxm_put_16(b, oxm ? OXM_OF_ARP_OP : NXM_OF_ARP_OP, |
562 | htons(flow->nw_proto)); | |
09246b99 | 563 | } |
b5ae8913 SH |
564 | nxm_put_32m(b, oxm ? OXM_OF_ARP_SPA : NXM_OF_ARP_SPA, |
565 | flow->nw_src, cr->wc.nw_src_mask); | |
566 | nxm_put_32m(b, oxm ? OXM_OF_ARP_TPA : NXM_OF_ARP_TPA, | |
567 | flow->nw_dst, cr->wc.nw_dst_mask); | |
bad68a99 | 568 | if (!(wc & FWW_ARP_SHA)) { |
b5ae8913 SH |
569 | nxm_put_eth(b, oxm ? OXM_OF_ARP_SHA : NXM_NX_ARP_SHA, |
570 | flow->arp_sha); | |
bad68a99 JP |
571 | } |
572 | if (!(wc & FWW_ARP_THA)) { | |
b5ae8913 SH |
573 | nxm_put_eth(b, oxm ? OXM_OF_ARP_THA : NXM_NX_ARP_THA, |
574 | flow->arp_tha); | |
bad68a99 | 575 | } |
09246b99 BP |
576 | } |
577 | ||
578 | /* Tunnel ID. */ | |
8368c090 | 579 | nxm_put_64m(b, NXM_NX_TUN_ID, flow->tun_id, cr->wc.tun_id_mask); |
09246b99 | 580 | |
b6c9e612 BP |
581 | /* Registers. */ |
582 | for (i = 0; i < FLOW_N_REGS; i++) { | |
583 | nxm_put_32m(b, NXM_NX_REG(i), | |
584 | htonl(flow->regs[i]), htonl(cr->wc.reg_masks[i])); | |
585 | } | |
586 | ||
e729e793 JP |
587 | /* Cookie. */ |
588 | nxm_put_64m(b, NXM_NX_COOKIE, cookie, cookie_mask); | |
589 | ||
09246b99 BP |
590 | match_len = b->size - start_len; |
591 | ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len); | |
592 | return match_len; | |
593 | } | |
594 | \f | |
595 | /* nx_match_to_string() and helpers. */ | |
596 | ||
f393f81e BP |
597 | static void format_nxm_field_name(struct ds *, uint32_t header); |
598 | ||
09246b99 BP |
599 | char * |
600 | nx_match_to_string(const uint8_t *p, unsigned int match_len) | |
601 | { | |
602 | uint32_t header; | |
603 | struct ds s; | |
604 | ||
605 | if (!match_len) { | |
606 | return xstrdup("<any>"); | |
607 | } | |
608 | ||
609 | ds_init(&s); | |
610 | while ((header = nx_entry_ok(p, match_len)) != 0) { | |
611 | unsigned int length = NXM_LENGTH(header); | |
612 | unsigned int value_len = nxm_field_bytes(header); | |
613 | const uint8_t *value = p + 4; | |
614 | const uint8_t *mask = value + value_len; | |
09246b99 BP |
615 | unsigned int i; |
616 | ||
617 | if (s.length) { | |
618 | ds_put_cstr(&s, ", "); | |
619 | } | |
620 | ||
f393f81e | 621 | format_nxm_field_name(&s, header); |
09246b99 BP |
622 | ds_put_char(&s, '('); |
623 | ||
624 | for (i = 0; i < value_len; i++) { | |
625 | ds_put_format(&s, "%02x", value[i]); | |
626 | } | |
627 | if (NXM_HASMASK(header)) { | |
628 | ds_put_char(&s, '/'); | |
629 | for (i = 0; i < value_len; i++) { | |
630 | ds_put_format(&s, "%02x", mask[i]); | |
631 | } | |
632 | } | |
633 | ds_put_char(&s, ')'); | |
634 | ||
635 | p += 4 + length; | |
636 | match_len -= 4 + length; | |
637 | } | |
638 | ||
639 | if (match_len) { | |
640 | if (s.length) { | |
641 | ds_put_cstr(&s, ", "); | |
642 | } | |
643 | ||
644 | ds_put_format(&s, "<%u invalid bytes>", match_len); | |
645 | } | |
646 | ||
647 | return ds_steal_cstr(&s); | |
648 | } | |
649 | ||
f393f81e BP |
650 | static void |
651 | format_nxm_field_name(struct ds *s, uint32_t header) | |
652 | { | |
28da1f8f BP |
653 | const struct mf_field *mf = mf_from_nxm_header(header); |
654 | if (mf) { | |
b5ae8913 | 655 | ds_put_cstr(s, IS_OXM_HEADER(header) ? mf->oxm_name : mf->nxm_name); |
28da1f8f BP |
656 | if (NXM_HASMASK(header)) { |
657 | ds_put_cstr(s, "_W"); | |
658 | } | |
e729e793 JP |
659 | } else if (header == NXM_NX_COOKIE) { |
660 | ds_put_cstr(s, "NXM_NX_COOKIE"); | |
661 | } else if (header == NXM_NX_COOKIE_W) { | |
662 | ds_put_cstr(s, "NXM_NX_COOKIE_W"); | |
f393f81e BP |
663 | } else { |
664 | ds_put_format(s, "%d:%d", NXM_VENDOR(header), NXM_FIELD(header)); | |
665 | } | |
666 | } | |
667 | ||
558d80cb BP |
668 | static uint32_t |
669 | parse_nxm_field_name(const char *name, int name_len) | |
09246b99 | 670 | { |
28da1f8f BP |
671 | bool wild; |
672 | int i; | |
09246b99 | 673 | |
558d80cb | 674 | /* Check whether it's a field name. */ |
28da1f8f BP |
675 | wild = name_len > 2 && !memcmp(&name[name_len - 2], "_W", 2); |
676 | if (wild) { | |
677 | name_len -= 2; | |
678 | } | |
e729e793 | 679 | |
28da1f8f BP |
680 | for (i = 0; i < MFF_N_IDS; i++) { |
681 | const struct mf_field *mf = mf_from_id(i); | |
b5ae8913 SH |
682 | uint32_t header; |
683 | ||
684 | if (mf->nxm_name && | |
685 | !strncmp(mf->nxm_name, name, name_len) && | |
686 | mf->nxm_name[name_len] == '\0') { | |
687 | header = mf->nxm_header; | |
688 | } else if (mf->oxm_name && | |
689 | !strncmp(mf->oxm_name, name, name_len) && | |
690 | mf->oxm_name[name_len] == '\0') { | |
691 | header = mf->oxm_header; | |
692 | } else { | |
693 | continue; | |
694 | } | |
28da1f8f | 695 | |
b5ae8913 SH |
696 | if (!wild) { |
697 | return header; | |
698 | } else if (mf->maskable != MFM_NONE) { | |
699 | return NXM_MAKE_WILD_HEADER(header); | |
09246b99 BP |
700 | } |
701 | } | |
702 | ||
b5ae8913 SH |
703 | if (!strncmp("NXM_NX_COOKIE", name, name_len) && |
704 | (name_len == strlen("NXM_NX_COOKIE"))) { | |
e729e793 JP |
705 | if (!wild) { |
706 | return NXM_NX_COOKIE; | |
707 | } else { | |
708 | return NXM_NX_COOKIE_W; | |
709 | } | |
710 | } | |
711 | ||
558d80cb BP |
712 | /* Check whether it's a 32-bit field header value as hex. |
713 | * (This isn't ordinarily useful except for testing error behavior.) */ | |
714 | if (name_len == 8) { | |
715 | uint32_t header = hexits_value(name, name_len, NULL); | |
716 | if (header != UINT_MAX) { | |
717 | return header; | |
718 | } | |
719 | } | |
720 | ||
721 | return 0; | |
09246b99 | 722 | } |
09246b99 BP |
723 | \f |
724 | /* nx_match_from_string(). */ | |
725 | ||
726 | int | |
727 | nx_match_from_string(const char *s, struct ofpbuf *b) | |
728 | { | |
729 | const char *full_s = s; | |
730 | const size_t start_len = b->size; | |
731 | int match_len; | |
732 | ||
733 | if (!strcmp(s, "<any>")) { | |
734 | /* Ensure that 'b->data' isn't actually null. */ | |
735 | ofpbuf_prealloc_tailroom(b, 1); | |
736 | return 0; | |
737 | } | |
738 | ||
739 | for (s += strspn(s, ", "); *s; s += strspn(s, ", ")) { | |
558d80cb BP |
740 | const char *name; |
741 | uint32_t header; | |
09246b99 | 742 | int name_len; |
78090f63 | 743 | size_t n; |
09246b99 | 744 | |
558d80cb | 745 | name = s; |
09246b99 BP |
746 | name_len = strcspn(s, "("); |
747 | if (s[name_len] != '(') { | |
748 | ovs_fatal(0, "%s: missing ( at end of nx_match", full_s); | |
749 | } | |
750 | ||
558d80cb BP |
751 | header = parse_nxm_field_name(name, name_len); |
752 | if (!header) { | |
09246b99 BP |
753 | ovs_fatal(0, "%s: unknown field `%.*s'", full_s, name_len, s); |
754 | } | |
755 | ||
756 | s += name_len + 1; | |
757 | ||
558d80cb | 758 | nxm_put_header(b, header); |
78090f63 BP |
759 | s = ofpbuf_put_hex(b, s, &n); |
760 | if (n != nxm_field_bytes(header)) { | |
761 | ovs_fatal(0, "%.2s: hex digits expected", s); | |
762 | } | |
558d80cb | 763 | if (NXM_HASMASK(header)) { |
09246b99 BP |
764 | s += strspn(s, " "); |
765 | if (*s != '/') { | |
558d80cb BP |
766 | ovs_fatal(0, "%s: missing / in masked field %.*s", |
767 | full_s, name_len, name); | |
09246b99 | 768 | } |
78090f63 BP |
769 | s = ofpbuf_put_hex(b, s + 1, &n); |
770 | if (n != nxm_field_bytes(header)) { | |
771 | ovs_fatal(0, "%.2s: hex digits expected", s); | |
772 | } | |
09246b99 BP |
773 | } |
774 | ||
775 | s += strspn(s, " "); | |
776 | if (*s != ')') { | |
558d80cb BP |
777 | ovs_fatal(0, "%s: missing ) following field %.*s", |
778 | full_s, name_len, name); | |
09246b99 BP |
779 | } |
780 | s++; | |
781 | } | |
782 | ||
783 | match_len = b->size - start_len; | |
784 | ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len); | |
785 | return match_len; | |
786 | } | |
b6c9e612 | 787 | \f |
f393f81e BP |
788 | void |
789 | nxm_parse_reg_move(struct nx_action_reg_move *move, const char *s) | |
790 | { | |
791 | const char *full_s = s; | |
816fd533 | 792 | struct mf_subfield src, dst; |
f393f81e | 793 | |
816fd533 | 794 | s = mf_parse_subfield(&src, s); |
f393f81e BP |
795 | if (strncmp(s, "->", 2)) { |
796 | ovs_fatal(0, "%s: missing `->' following source", full_s); | |
797 | } | |
798 | s += 2; | |
816fd533 | 799 | s = mf_parse_subfield(&dst, s); |
f393f81e BP |
800 | if (*s != '\0') { |
801 | ovs_fatal(0, "%s: trailing garbage following destination", full_s); | |
802 | } | |
803 | ||
816fd533 | 804 | if (src.n_bits != dst.n_bits) { |
f393f81e | 805 | ovs_fatal(0, "%s: source field is %d bits wide but destination is " |
816fd533 | 806 | "%d bits wide", full_s, src.n_bits, dst.n_bits); |
f393f81e BP |
807 | } |
808 | ||
93996add | 809 | ofputil_init_NXAST_REG_MOVE(move); |
816fd533 BP |
810 | move->n_bits = htons(src.n_bits); |
811 | move->src_ofs = htons(src.ofs); | |
812 | move->dst_ofs = htons(dst.ofs); | |
813 | move->src = htonl(src.field->nxm_header); | |
814 | move->dst = htonl(dst.field->nxm_header); | |
f393f81e BP |
815 | } |
816 | ||
817 | void | |
818 | nxm_parse_reg_load(struct nx_action_reg_load *load, const char *s) | |
819 | { | |
820 | const char *full_s = s; | |
816fd533 | 821 | struct mf_subfield dst; |
f393f81e BP |
822 | uint64_t value; |
823 | ||
824 | value = strtoull(s, (char **) &s, 0); | |
825 | if (strncmp(s, "->", 2)) { | |
826 | ovs_fatal(0, "%s: missing `->' following value", full_s); | |
827 | } | |
828 | s += 2; | |
816fd533 | 829 | s = mf_parse_subfield(&dst, s); |
f393f81e BP |
830 | if (*s != '\0') { |
831 | ovs_fatal(0, "%s: trailing garbage following destination", full_s); | |
832 | } | |
833 | ||
816fd533 BP |
834 | if (dst.n_bits < 64 && (value >> dst.n_bits) != 0) { |
835 | ovs_fatal(0, "%s: value %"PRIu64" does not fit into %u bits", | |
836 | full_s, value, dst.n_bits); | |
f393f81e BP |
837 | } |
838 | ||
93996add | 839 | ofputil_init_NXAST_REG_LOAD(load); |
816fd533 BP |
840 | load->ofs_nbits = nxm_encode_ofs_nbits(dst.ofs, dst.n_bits); |
841 | load->dst = htonl(dst.field->nxm_header); | |
f393f81e BP |
842 | load->value = htonll(value); |
843 | } | |
844 | \f | |
845 | /* nxm_format_reg_move(), nxm_format_reg_load(). */ | |
846 | ||
f393f81e BP |
847 | void |
848 | nxm_format_reg_move(const struct nx_action_reg_move *move, struct ds *s) | |
849 | { | |
816fd533 BP |
850 | struct mf_subfield src, dst; |
851 | ||
852 | nxm_decode_discrete(&src, move->src, move->src_ofs, move->n_bits); | |
853 | nxm_decode_discrete(&dst, move->dst, move->dst_ofs, move->n_bits); | |
f393f81e BP |
854 | |
855 | ds_put_format(s, "move:"); | |
816fd533 | 856 | mf_format_subfield(&src, s); |
f393f81e | 857 | ds_put_cstr(s, "->"); |
816fd533 | 858 | mf_format_subfield(&dst, s); |
f393f81e BP |
859 | } |
860 | ||
861 | void | |
862 | nxm_format_reg_load(const struct nx_action_reg_load *load, struct ds *s) | |
863 | { | |
816fd533 | 864 | struct mf_subfield dst; |
f393f81e | 865 | |
816fd533 BP |
866 | ds_put_format(s, "load:%#"PRIx64"->", ntohll(load->value)); |
867 | ||
868 | nxm_decode(&dst, load->dst, load->ofs_nbits); | |
869 | mf_format_subfield(&dst, s); | |
f393f81e BP |
870 | } |
871 | \f | |
b6c9e612 BP |
872 | /* nxm_check_reg_move(), nxm_check_reg_load(). */ |
873 | ||
816fd533 | 874 | enum ofperr |
b6c9e612 BP |
875 | nxm_check_reg_move(const struct nx_action_reg_move *action, |
876 | const struct flow *flow) | |
877 | { | |
816fd533 BP |
878 | struct mf_subfield src; |
879 | struct mf_subfield dst; | |
ce523f65 | 880 | int error; |
b6c9e612 | 881 | |
816fd533 BP |
882 | nxm_decode_discrete(&src, action->src, action->src_ofs, action->n_bits); |
883 | error = mf_check_src(&src, flow); | |
ce523f65 EJ |
884 | if (error) { |
885 | return error; | |
b6c9e612 BP |
886 | } |
887 | ||
816fd533 BP |
888 | nxm_decode_discrete(&dst, action->dst, action->dst_ofs, action->n_bits); |
889 | return mf_check_dst(&dst, flow); | |
43edca57 EJ |
890 | } |
891 | ||
90bf1e07 | 892 | enum ofperr |
43edca57 EJ |
893 | nxm_check_reg_load(const struct nx_action_reg_load *action, |
894 | const struct flow *flow) | |
895 | { | |
816fd533 | 896 | struct mf_subfield dst; |
90bf1e07 | 897 | enum ofperr error; |
43edca57 | 898 | |
816fd533 BP |
899 | nxm_decode(&dst, action->dst, action->ofs_nbits); |
900 | error = mf_check_dst(&dst, flow); | |
43edca57 EJ |
901 | if (error) { |
902 | return error; | |
b6c9e612 BP |
903 | } |
904 | ||
905 | /* Reject 'action' if a bit numbered 'n_bits' or higher is set to 1 in | |
906 | * action->value. */ | |
816fd533 | 907 | if (dst.n_bits < 64 && ntohll(action->value) >> dst.n_bits) { |
90bf1e07 | 908 | return OFPERR_OFPBAC_BAD_ARGUMENT; |
b6c9e612 BP |
909 | } |
910 | ||
b6c9e612 BP |
911 | return 0; |
912 | } | |
913 | \f | |
914 | /* nxm_execute_reg_move(), nxm_execute_reg_load(). */ | |
915 | ||
b6c9e612 BP |
916 | void |
917 | nxm_execute_reg_move(const struct nx_action_reg_move *action, | |
918 | struct flow *flow) | |
919 | { | |
816fd533 | 920 | struct mf_subfield src, dst; |
28da1f8f BP |
921 | union mf_value src_value; |
922 | union mf_value dst_value; | |
923 | ||
816fd533 BP |
924 | nxm_decode_discrete(&src, action->src, action->src_ofs, action->n_bits); |
925 | nxm_decode_discrete(&dst, action->dst, action->dst_ofs, action->n_bits); | |
926 | ||
927 | mf_get_value(dst.field, flow, &dst_value); | |
928 | mf_get_value(src.field, flow, &src_value); | |
929 | bitwise_copy(&src_value, src.field->n_bytes, src.ofs, | |
930 | &dst_value, dst.field->n_bytes, dst.ofs, | |
931 | src.n_bits); | |
932 | mf_set_flow_value(dst.field, &dst_value, flow); | |
b6c9e612 BP |
933 | } |
934 | ||
935 | void | |
936 | nxm_execute_reg_load(const struct nx_action_reg_load *action, | |
937 | struct flow *flow) | |
938 | { | |
816fd533 BP |
939 | struct mf_subfield dst; |
940 | ||
941 | nxm_decode(&dst, action->dst, action->ofs_nbits); | |
942 | mf_set_subfield_value(&dst, ntohll(action->value), flow); | |
43edca57 | 943 | } |
b6c9e612 | 944 | |
816fd533 BP |
945 | /* Initializes 'sf->field' with the field corresponding to the given NXM |
946 | * 'header' and 'sf->ofs' and 'sf->n_bits' decoded from 'ofs_nbits' with | |
947 | * nxm_decode_ofs() and nxm_decode_n_bits(), respectively. | |
948 | * | |
949 | * Afterward, 'sf' might be invalid in a few different ways: | |
950 | * | |
951 | * - 'sf->field' will be NULL if 'header' is unknown. | |
952 | * | |
953 | * - 'sf->ofs' and 'sf->n_bits' might exceed the width of sf->field. | |
954 | * | |
955 | * The caller should call mf_check_src() or mf_check_dst() to check for these | |
956 | * problems. */ | |
43edca57 | 957 | void |
816fd533 | 958 | nxm_decode(struct mf_subfield *sf, ovs_be32 header, ovs_be16 ofs_nbits) |
43edca57 | 959 | { |
816fd533 BP |
960 | sf->field = mf_from_nxm_header(ntohl(header)); |
961 | sf->ofs = nxm_decode_ofs(ofs_nbits); | |
962 | sf->n_bits = nxm_decode_n_bits(ofs_nbits); | |
963 | } | |
28da1f8f | 964 | |
816fd533 BP |
965 | /* Initializes 'sf->field' with the field corresponding to the given NXM |
966 | * 'header' and 'sf->ofs' and 'sf->n_bits' from 'ofs' and 'n_bits', | |
967 | * respectively. | |
968 | * | |
969 | * Afterward, 'sf' might be invalid in a few different ways: | |
970 | * | |
971 | * - 'sf->field' will be NULL if 'header' is unknown. | |
972 | * | |
973 | * - 'sf->ofs' and 'sf->n_bits' might exceed the width of sf->field. | |
974 | * | |
975 | * The caller should call mf_check_src() or mf_check_dst() to check for these | |
976 | * problems. */ | |
977 | void | |
978 | nxm_decode_discrete(struct mf_subfield *sf, ovs_be32 header, | |
979 | ovs_be16 ofs, ovs_be16 n_bits) | |
980 | { | |
981 | sf->field = mf_from_nxm_header(ntohl(header)); | |
982 | sf->ofs = ntohs(ofs); | |
983 | sf->n_bits = ntohs(n_bits); | |
b6c9e612 | 984 | } |