lib/ofp-print.c

   1 /*
   2  * Copyright (c) 2008, 2009, 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 #include "ofp-print.h"
  19 #include "xtoxll.h"
  20
  21 #include <errno.h>
  22 #include <inttypes.h>
  23 #include <netinet/in.h>
  24 #include <sys/wait.h>
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #include <ctype.h>
  28
  29 #include "compiler.h"
  30 #include "dynamic-string.h"
  31 #include "flow.h"
  32 #include "ofpbuf.h"
  33 #include "openflow/openflow.h"
  34 #include "openflow/nicira-ext.h"
  35 #include "packets.h"
  36 #include "pcap.h"
  37 #include "util.h"
  38
  39 static void ofp_print_port_name(struct ds *string, uint16_t port);
  40
  41 /* Returns a string that represents the contents of the Ethernet frame in the
  42  * 'len' bytes starting at 'data' to 'stream' as output by tcpdump.
  43  * 'total_len' specifies the full length of the Ethernet frame (of which 'len'
  44  * bytes were captured).
  45  *
  46  * The caller must free the returned string.
  47  *
  48  * This starts and kills a tcpdump subprocess so it's quite expensive. */
  49 char *
  50 ofp_packet_to_string(const void *data, size_t len, size_t total_len OVS_UNUSED)
  51 {
  52     struct ds ds = DS_EMPTY_INITIALIZER;
  53     struct ofpbuf buf;
  54
  55     char command[128];
  56     FILE *pcap;
  57     FILE *tcpdump;
  58     int status;
  59     int c;
  60
  61     buf.data = (void *) data;
  62     buf.size = len;
  63
  64     pcap = tmpfile();
  65     if (!pcap) {
  66         ovs_error(errno, "tmpfile");
  67         return xstrdup("<error>");
  68     }
  69     pcap_write_header(pcap);
  70     pcap_write(pcap, &buf);
  71     fflush(pcap);
  72     if (ferror(pcap)) {
  73         ovs_error(errno, "error writing temporary file");
  74     }
  75     rewind(pcap);
  76
  77     snprintf(command, sizeof command, "/usr/sbin/tcpdump -e -n -r /dev/fd/%d 2>/dev/null",
  78              fileno(pcap));
  79     tcpdump = popen(command, "r");
  80     fclose(pcap);
  81     if (!tcpdump) {
  82         ovs_error(errno, "exec(\"%s\")", command);
  83         return xstrdup("<error>");
  84     }
  85
  86     while ((c = getc(tcpdump)) != EOF) {
  87         ds_put_char(&ds, c);
  88     }
  89
  90     status = pclose(tcpdump);
  91     if (WIFEXITED(status)) {
  92         if (WEXITSTATUS(status))
  93             ovs_error(0, "tcpdump exited with status %d", WEXITSTATUS(status));
  94     } else if (WIFSIGNALED(status)) {
  95         ovs_error(0, "tcpdump exited with signal %d", WTERMSIG(status));
  96     }
  97     return ds_cstr(&ds);
  98 }
  99
 100 /* Pretty-print the OFPT_PACKET_IN packet of 'len' bytes at 'oh' to 'stream'
 101  * at the given 'verbosity' level. */
 102 static void
 103 ofp_packet_in(struct ds *string, const void *oh, size_t len, int verbosity)
 104 {
 105     const struct ofp_packet_in *op = oh;
 106     size_t data_len;
 107
 108     ds_put_format(string, " total_len=%"PRIu16" in_port=",
 109                   ntohs(op->total_len));
 110     ofp_print_port_name(string, ntohs(op->in_port));
 111
 112     if (op->reason == OFPR_ACTION)
 113         ds_put_cstr(string, " (via action)");
 114     else if (op->reason != OFPR_NO_MATCH)
 115         ds_put_format(string, " (***reason %"PRIu8"***)", op->reason);
 116
 117     data_len = len - offsetof(struct ofp_packet_in, data);
 118     ds_put_format(string, " data_len=%zu", data_len);
 119     if (htonl(op->buffer_id) == UINT32_MAX) {
 120         ds_put_format(string, " (unbuffered)");
 121         if (ntohs(op->total_len) != data_len)
 122             ds_put_format(string, " (***total_len != data_len***)");
 123     } else {
 124         ds_put_format(string, " buffer=0x%08"PRIx32, ntohl(op->buffer_id));
 125         if (ntohs(op->total_len) < data_len)
 126             ds_put_format(string, " (***total_len < data_len***)");
 127     }
 128     ds_put_char(string, '\n');
 129
 130     if (verbosity > 0) {
 131         flow_t flow;
 132         struct ofpbuf packet;
 133         struct ofp_match match;
 134         packet.data = (void *) op->data;
 135         packet.size = data_len;
 136         flow_extract(&packet, ntohs(op->in_port), &flow);
 137         flow_to_match(&flow, 0, &match);
 138         ofp_print_match(string, &match, verbosity);
 139         ds_put_char(string, '\n');
 140     }
 141     if (verbosity > 1) {
 142         char *packet = ofp_packet_to_string(op->data, data_len,
 143                                             ntohs(op->total_len));
 144         ds_put_cstr(string, packet);
 145         free(packet);
 146     }
 147 }
 148
 149 static void ofp_print_port_name(struct ds *string, uint16_t port)
 150 {
 151     const char *name;
 152     switch (port) {
 153     case OFPP_IN_PORT:
 154         name = "IN_PORT";
 155         break;
 156     case OFPP_TABLE:
 157         name = "TABLE";
 158         break;
 159     case OFPP_NORMAL:
 160         name = "NORMAL";
 161         break;
 162     case OFPP_FLOOD:
 163         name = "FLOOD";
 164         break;
 165     case OFPP_ALL:
 166         name = "ALL";
 167         break;
 168     case OFPP_CONTROLLER:
 169         name = "CONTROLLER";
 170         break;
 171     case OFPP_LOCAL:
 172         name = "LOCAL";
 173         break;
 174     case OFPP_NONE:
 175         name = "NONE";
 176         break;
 177     default:
 178         ds_put_format(string, "%"PRIu16, port);
 179         return;
 180     }
 181     ds_put_cstr(string, name);
 182 }
 183
 184 static void
 185 ofp_print_nx_action(struct ds *string, const struct nx_action_header *nah)
 186 {
 187     switch (ntohs(nah->subtype)) {
 188     case NXAST_RESUBMIT: {
 189         const struct nx_action_resubmit *nar = (struct nx_action_resubmit *)nah;
 190         ds_put_format(string, "resubmit:");
 191         ofp_print_port_name(string, ntohs(nar->in_port));
 192         break;
 193     }
 194
 195     default:
 196         ds_put_format(string, "***unknown Nicira action:%d***\n",
 197                       ntohs(nah->subtype));
 198     }
 199 }
 200
 201 static int
 202 ofp_print_action(struct ds *string, const struct ofp_action_header *ah,
 203         size_t actions_len)
 204 {
 205     uint16_t type;
 206     size_t len;
 207
 208     struct openflow_action {
 209         size_t min_size;
 210         size_t max_size;
 211     };
 212
 213     const struct openflow_action of_actions[] = {
 214         [OFPAT_OUTPUT] = {
 215             sizeof(struct ofp_action_output),
 216             sizeof(struct ofp_action_output),
 217         },
 218         [OFPAT_SET_VLAN_VID] = {
 219             sizeof(struct ofp_action_vlan_vid),
 220             sizeof(struct ofp_action_vlan_vid),
 221         },
 222         [OFPAT_SET_VLAN_PCP] = {
 223             sizeof(struct ofp_action_vlan_pcp),
 224             sizeof(struct ofp_action_vlan_pcp),
 225         },
 226         [OFPAT_STRIP_VLAN] = {
 227             sizeof(struct ofp_action_header),
 228             sizeof(struct ofp_action_header),
 229         },
 230         [OFPAT_SET_DL_SRC] = {
 231             sizeof(struct ofp_action_dl_addr),
 232             sizeof(struct ofp_action_dl_addr),
 233         },
 234         [OFPAT_SET_DL_DST] = {
 235             sizeof(struct ofp_action_dl_addr),
 236             sizeof(struct ofp_action_dl_addr),
 237         },
 238         [OFPAT_SET_NW_SRC] = {
 239             sizeof(struct ofp_action_nw_addr),
 240             sizeof(struct ofp_action_nw_addr),
 241         },
 242         [OFPAT_SET_NW_DST] = {
 243             sizeof(struct ofp_action_nw_addr),
 244             sizeof(struct ofp_action_nw_addr),
 245         },
 246         [OFPAT_SET_NW_TOS] = {
 247             sizeof(struct ofp_action_nw_tos),
 248             sizeof(struct ofp_action_nw_tos),
 249         },
 250         [OFPAT_SET_TP_SRC] = {
 251             sizeof(struct ofp_action_tp_port),
 252             sizeof(struct ofp_action_tp_port),
 253         },
 254         [OFPAT_SET_TP_DST] = {
 255             sizeof(struct ofp_action_tp_port),
 256             sizeof(struct ofp_action_tp_port),
 257         }
 258         /* OFPAT_VENDOR is not here, since it would blow up the array size. */
 259     };
 260
 261     if (actions_len < sizeof *ah) {
 262         ds_put_format(string, "***action array too short for next action***\n");
 263         return -1;
 264     }
 265
 266     type = ntohs(ah->type);
 267     len = ntohs(ah->len);
 268     if (actions_len < len) {
 269         ds_put_format(string, "***truncated action %"PRIu16"***\n", type);
 270         return -1;
 271     }
 272
 273     if ((len % 8) != 0) {
 274         ds_put_format(string,
 275                 "***action %"PRIu16" length not a multiple of 8***\n",
 276                 type);
 277         return -1;
 278     }
 279
 280     if (type < ARRAY_SIZE(of_actions)) {
 281         const struct openflow_action *act = &of_actions[type];
 282         if ((len < act->min_size) || (len > act->max_size)) {
 283             ds_put_format(string,
 284                     "***action %"PRIu16" wrong length: %zu***\n", type, len);
 285             return -1;
 286         }
 287     }
 288
 289     switch (type) {
 290     case OFPAT_OUTPUT: {
 291         struct ofp_action_output *oa = (struct ofp_action_output *)ah;
 292         uint16_t port = ntohs(oa->port);
 293         if (port < OFPP_MAX) {
 294             ds_put_format(string, "output:%"PRIu16, port);
 295         } else {
 296             ofp_print_port_name(string, port);
 297             if (port == OFPP_CONTROLLER) {
 298                 if (oa->max_len) {
 299                     ds_put_format(string, ":%"PRIu16, ntohs(oa->max_len));
 300                 } else {
 301                     ds_put_cstr(string, ":all");
 302                 }
 303             }
 304         }
 305         break;
 306     }
 307
 308     case OFPAT_SET_VLAN_VID: {
 309         struct ofp_action_vlan_vid *va = (struct ofp_action_vlan_vid *)ah;
 310         ds_put_format(string, "mod_vlan_vid:%"PRIu16, ntohs(va->vlan_vid));
 311         break;
 312     }
 313
 314     case OFPAT_SET_VLAN_PCP: {
 315         struct ofp_action_vlan_pcp *va = (struct ofp_action_vlan_pcp *)ah;
 316         ds_put_format(string, "mod_vlan_pcp:%"PRIu8, va->vlan_pcp);
 317         break;
 318     }
 319
 320     case OFPAT_STRIP_VLAN:
 321         ds_put_cstr(string, "strip_vlan");
 322         break;
 323
 324     case OFPAT_SET_DL_SRC: {
 325         struct ofp_action_dl_addr *da = (struct ofp_action_dl_addr *)ah;
 326         ds_put_format(string, "mod_dl_src:"ETH_ADDR_FMT,
 327                 ETH_ADDR_ARGS(da->dl_addr));
 328         break;
 329     }
 330
 331     case OFPAT_SET_DL_DST: {
 332         struct ofp_action_dl_addr *da = (struct ofp_action_dl_addr *)ah;
 333         ds_put_format(string, "mod_dl_dst:"ETH_ADDR_FMT,
 334                 ETH_ADDR_ARGS(da->dl_addr));
 335         break;
 336     }
 337
 338     case OFPAT_SET_NW_SRC: {
 339         struct ofp_action_nw_addr *na = (struct ofp_action_nw_addr *)ah;
 340         ds_put_format(string, "mod_nw_src:"IP_FMT, IP_ARGS(&na->nw_addr));
 341         break;
 342     }
 343
 344     case OFPAT_SET_NW_DST: {
 345         struct ofp_action_nw_addr *na = (struct ofp_action_nw_addr *)ah;
 346         ds_put_format(string, "mod_nw_dst:"IP_FMT, IP_ARGS(&na->nw_addr));
 347         break;
 348     }
 349
 350     case OFPAT_SET_NW_TOS: {
 351         struct ofp_action_nw_tos *nt = (struct ofp_action_nw_tos *)ah;
 352         ds_put_format(string, "mod_nw_tos:%d", nt->nw_tos);
 353         break;
 354     }
 355
 356     case OFPAT_SET_TP_SRC: {
 357         struct ofp_action_tp_port *ta = (struct ofp_action_tp_port *)ah;
 358         ds_put_format(string, "mod_tp_src:%d", ntohs(ta->tp_port));
 359         break;
 360     }
 361
 362     case OFPAT_SET_TP_DST: {
 363         struct ofp_action_tp_port *ta = (struct ofp_action_tp_port *)ah;
 364         ds_put_format(string, "mod_tp_dst:%d", ntohs(ta->tp_port));
 365         break;
 366     }
 367
 368     case OFPAT_VENDOR: {
 369         struct ofp_action_vendor_header *avh
 370                 = (struct ofp_action_vendor_header *)ah;
 371         if (len < sizeof *avh) {
 372             ds_put_format(string, "***ofpat_vendor truncated***\n");
 373             return -1;
 374         }
 375         if (avh->vendor == htonl(NX_VENDOR_ID)) {
 376             ofp_print_nx_action(string, (struct nx_action_header *)avh);
 377         } else {
 378             ds_put_format(string, "vendor action:0x%x", ntohl(avh->vendor));
 379         }
 380         break;
 381     }
 382
 383     default:
 384         ds_put_format(string, "(decoder %"PRIu16" not implemented)", type);
 385         break;
 386     }
 387
 388     return len;
 389 }
 390
 391 void
 392 ofp_print_actions(struct ds *string, const struct ofp_action_header *action,
 393                   size_t actions_len)
 394 {
 395     uint8_t *p = (uint8_t *)action;
 396     int len = 0;
 397
 398     ds_put_cstr(string, "actions=");
 399     if (!actions_len) {
 400         ds_put_cstr(string, "drop");
 401     }
 402     while (actions_len > 0) {
 403         if (len) {
 404             ds_put_cstr(string, ",");
 405         }
 406         len = ofp_print_action(string, (struct ofp_action_header *)p,
 407                 actions_len);
 408         if (len < 0) {
 409             return;
 410         }
 411         p += len;
 412         actions_len -= len;
 413     }
 414 }
 415
 416 /* Pretty-print the OFPT_PACKET_OUT packet of 'len' bytes at 'oh' to 'string'
 417  * at the given 'verbosity' level. */
 418 static void ofp_packet_out(struct ds *string, const void *oh, size_t len,
 419                            int verbosity)
 420 {
 421     const struct ofp_packet_out *opo = oh;
 422     size_t actions_len = ntohs(opo->actions_len);
 423
 424     ds_put_cstr(string, " in_port=");
 425     ofp_print_port_name(string, ntohs(opo->in_port));
 426
 427     ds_put_format(string, " actions_len=%zu ", actions_len);
 428     if (actions_len > (ntohs(opo->header.length) - sizeof *opo)) {
 429         ds_put_format(string, "***packet too short for action length***\n");
 430         return;
 431     }
 432     ofp_print_actions(string, opo->actions, actions_len);
 433
 434     if (ntohl(opo->buffer_id) == UINT32_MAX) {
 435         int data_len = len - sizeof *opo - actions_len;
 436         ds_put_format(string, " data_len=%d", data_len);
 437         if (verbosity > 0 && len > sizeof *opo) {
 438             char *packet = ofp_packet_to_string(
 439                     (uint8_t *)opo->actions + actions_len, data_len, data_len);
 440             ds_put_char(string, '\n');
 441             ds_put_cstr(string, packet);
 442             free(packet);
 443         }
 444     } else {
 445         ds_put_format(string, " buffer=0x%08"PRIx32, ntohl(opo->buffer_id));
 446     }
 447     ds_put_char(string, '\n');
 448 }
 449
 450 /* qsort comparison function. */
 451 static int
 452 compare_ports(const void *a_, const void *b_)
 453 {
 454     const struct ofp_phy_port *a = a_;
 455     const struct ofp_phy_port *b = b_;
 456     uint16_t ap = ntohs(a->port_no);
 457     uint16_t bp = ntohs(b->port_no);
 458
 459     return ap < bp ? -1 : ap > bp;
 460 }
 461
 462 static void ofp_print_port_features(struct ds *string, uint32_t features)
 463 {
 464     if (features == 0) {
 465         ds_put_cstr(string, "Unsupported\n");
 466         return;
 467     }
 468     if (features & OFPPF_10MB_HD) {
 469         ds_put_cstr(string, "10MB-HD ");
 470     }
 471     if (features & OFPPF_10MB_FD) {
 472         ds_put_cstr(string, "10MB-FD ");
 473     }
 474     if (features & OFPPF_100MB_HD) {
 475         ds_put_cstr(string, "100MB-HD ");
 476     }
 477     if (features & OFPPF_100MB_FD) {
 478         ds_put_cstr(string, "100MB-FD ");
 479     }
 480     if (features & OFPPF_1GB_HD) {
 481         ds_put_cstr(string, "1GB-HD ");
 482     }
 483     if (features & OFPPF_1GB_FD) {
 484         ds_put_cstr(string, "1GB-FD ");
 485     }
 486     if (features & OFPPF_10GB_FD) {
 487         ds_put_cstr(string, "10GB-FD ");
 488     }
 489     if (features & OFPPF_COPPER) {
 490         ds_put_cstr(string, "COPPER ");
 491     }
 492     if (features & OFPPF_FIBER) {
 493         ds_put_cstr(string, "FIBER ");
 494     }
 495     if (features & OFPPF_AUTONEG) {
 496         ds_put_cstr(string, "AUTO_NEG ");
 497     }
 498     if (features & OFPPF_PAUSE) {
 499         ds_put_cstr(string, "AUTO_PAUSE ");
 500     }
 501     if (features & OFPPF_PAUSE_ASYM) {
 502         ds_put_cstr(string, "AUTO_PAUSE_ASYM ");
 503     }
 504     ds_put_char(string, '\n');
 505 }
 506
 507 static void
 508 ofp_print_phy_port(struct ds *string, const struct ofp_phy_port *port)
 509 {
 510     uint8_t name[OFP_MAX_PORT_NAME_LEN];
 511     int j;
 512
 513     memcpy(name, port->name, sizeof name);
 514     for (j = 0; j < sizeof name - 1; j++) {
 515         if (!isprint(name[j])) {
 516             break;
 517         }
 518     }
 519     name[j] = '\0';
 520
 521     ds_put_char(string, ' ');
 522     ofp_print_port_name(string, ntohs(port->port_no));
 523     ds_put_format(string, "(%s): addr:"ETH_ADDR_FMT", config: %#x, state:%#x\n",
 524             name, ETH_ADDR_ARGS(port->hw_addr), ntohl(port->config),
 525             ntohl(port->state));
 526     if (port->curr) {
 527         ds_put_format(string, "     current:    ");
 528         ofp_print_port_features(string, ntohl(port->curr));
 529     }
 530     if (port->advertised) {
 531         ds_put_format(string, "     advertised: ");
 532         ofp_print_port_features(string, ntohl(port->advertised));
 533     }
 534     if (port->supported) {
 535         ds_put_format(string, "     supported:  ");
 536         ofp_print_port_features(string, ntohl(port->supported));
 537     }
 538     if (port->peer) {
 539         ds_put_format(string, "     peer:       ");
 540         ofp_print_port_features(string, ntohl(port->peer));
 541     }
 542 }
 543
 544 /* Pretty-print the struct ofp_switch_features of 'len' bytes at 'oh' to
 545  * 'string' at the given 'verbosity' level. */
 546 static void
 547 ofp_print_switch_features(struct ds *string, const void *oh, size_t len,
 548                           int verbosity OVS_UNUSED)
 549 {
 550     const struct ofp_switch_features *osf = oh;
 551     struct ofp_phy_port *port_list;
 552     int n_ports;
 553     int i;
 554
 555     ds_put_format(string, " ver:0x%x, dpid:%016"PRIx64"\n",
 556             osf->header.version, ntohll(osf->datapath_id));
 557     ds_put_format(string, "n_tables:%d, n_buffers:%d\n", osf->n_tables,
 558             ntohl(osf->n_buffers));
 559     ds_put_format(string, "features: capabilities:%#x, actions:%#x\n",
 560            ntohl(osf->capabilities), ntohl(osf->actions));
 561
 562     if (ntohs(osf->header.length) >= sizeof *osf) {
 563         len = MIN(len, ntohs(osf->header.length));
 564     }
 565     n_ports = (len - sizeof *osf) / sizeof *osf->ports;
 566
 567     port_list = xmemdup(osf->ports, len - sizeof *osf);
 568     qsort(port_list, n_ports, sizeof *port_list, compare_ports);
 569     for (i = 0; i < n_ports; i++) {
 570         ofp_print_phy_port(string, &port_list[i]);
 571     }
 572     free(port_list);
 573 }
 574
 575 /* Pretty-print the struct ofp_switch_config of 'len' bytes at 'oh' to 'string'
 576  * at the given 'verbosity' level. */
 577 static void
 578 ofp_print_switch_config(struct ds *string, const void *oh,
 579                         size_t len OVS_UNUSED, int verbosity OVS_UNUSED)
 580 {
 581     const struct ofp_switch_config *osc = oh;
 582     uint16_t flags;
 583
 584     flags = ntohs(osc->flags);
 585     if (flags) {
 586         ds_put_format(string, " ***unknown flags 0x%04"PRIx16"***", flags);
 587     }
 588
 589     ds_put_format(string, " miss_send_len=%"PRIu16"\n", ntohs(osc->miss_send_len));
 590 }
 591
 592 static void print_wild(struct ds *string, const char *leader, int is_wild,
 593             int verbosity, const char *format, ...)
 594             __attribute__((format(printf, 5, 6)));
 595
 596 static void print_wild(struct ds *string, const char *leader, int is_wild,
 597                        int verbosity, const char *format, ...)
 598 {
 599     if (is_wild && verbosity < 2) {
 600         return;
 601     }
 602     ds_put_cstr(string, leader);
 603     if (!is_wild) {
 604         va_list args;
 605
 606         va_start(args, format);
 607         ds_put_format_valist(string, format, args);
 608         va_end(args);
 609     } else {
 610         ds_put_char(string, '*');
 611     }
 612     ds_put_char(string, ',');
 613 }
 614
 615 static void
 616 print_ip_netmask(struct ds *string, const char *leader, uint32_t ip,
 617                  uint32_t wild_bits, int verbosity)
 618 {
 619     if (wild_bits >= 32 && verbosity < 2) {
 620         return;
 621     }
 622     ds_put_cstr(string, leader);
 623     if (wild_bits < 32) {
 624         ds_put_format(string, IP_FMT, IP_ARGS(&ip));
 625         if (wild_bits) {
 626             ds_put_format(string, "/%d", 32 - wild_bits);
 627         }
 628     } else {
 629         ds_put_char(string, '*');
 630     }
 631     ds_put_char(string, ',');
 632 }
 633
 634 void
 635 ofp_print_match(struct ds *f, const struct ofp_match *om, int verbosity)
 636 {
 637     char *s = ofp_match_to_string(om, verbosity);
 638     ds_put_cstr(f, s);
 639     free(s);
 640 }
 641
 642 char *
 643 ofp_match_to_string(const struct ofp_match *om, int verbosity)
 644 {
 645     struct ds f = DS_EMPTY_INITIALIZER;
 646     uint32_t w = ntohl(om->wildcards);
 647     bool skip_type = false;
 648     bool skip_proto = false;
 649
 650     if (!(w & OFPFW_DL_TYPE)) {
 651         skip_type = true;
 652         if (om->dl_type == htons(ETH_TYPE_IP)) {
 653             if (!(w & OFPFW_NW_PROTO)) {
 654                 skip_proto = true;
 655                 if (om->nw_proto == IP_TYPE_ICMP) {
 656                     ds_put_cstr(&f, "icmp,");
 657                 } else if (om->nw_proto == IP_TYPE_TCP) {
 658                     ds_put_cstr(&f, "tcp,");
 659                 } else if (om->nw_proto == IP_TYPE_UDP) {
 660                     ds_put_cstr(&f, "udp,");
 661                 } else {
 662                     ds_put_cstr(&f, "ip,");
 663                     skip_proto = false;
 664                 }
 665             } else {
 666                 ds_put_cstr(&f, "ip,");
 667             }
 668         } else if (om->dl_type == htons(ETH_TYPE_ARP)) {
 669             ds_put_cstr(&f, "arp,");
 670         } else {
 671             skip_type = false;
 672         }
 673     }
 674     print_wild(&f, "in_port=", w & OFPFW_IN_PORT, verbosity,
 675                "%d", ntohs(om->in_port));
 676     print_wild(&f, "dl_vlan=", w & OFPFW_DL_VLAN, verbosity,
 677                "0x%04x", ntohs(om->dl_vlan));
 678     print_wild(&f, "dl_vlan_pcp=", w & OFPFW_DL_VLAN_PCP, verbosity,
 679                "%d", om->dl_vlan_pcp);
 680     print_wild(&f, "dl_src=", w & OFPFW_DL_SRC, verbosity,
 681                ETH_ADDR_FMT, ETH_ADDR_ARGS(om->dl_src));
 682     print_wild(&f, "dl_dst=", w & OFPFW_DL_DST, verbosity,
 683                ETH_ADDR_FMT, ETH_ADDR_ARGS(om->dl_dst));
 684     if (!skip_type) {
 685         print_wild(&f, "dl_type=", w & OFPFW_DL_TYPE, verbosity,
 686                    "0x%04x", ntohs(om->dl_type));
 687     }
 688     print_ip_netmask(&f, "nw_src=", om->nw_src,
 689                      (w & OFPFW_NW_SRC_MASK) >> OFPFW_NW_SRC_SHIFT, verbosity);
 690     print_ip_netmask(&f, "nw_dst=", om->nw_dst,
 691                      (w & OFPFW_NW_DST_MASK) >> OFPFW_NW_DST_SHIFT, verbosity);
 692     if (!skip_proto) {
 693         if (om->dl_type == htons(ETH_TYPE_ARP)) {
 694             print_wild(&f, "opcode=", w & OFPFW_NW_PROTO, verbosity,
 695                        "%u", om->nw_proto);
 696         } else {
 697             print_wild(&f, "nw_proto=", w & OFPFW_NW_PROTO, verbosity,
 698                        "%u", om->nw_proto);
 699         }
 700     }
 701     if (om->nw_proto == IP_TYPE_ICMP) {
 702         print_wild(&f, "icmp_type=", w & OFPFW_ICMP_TYPE, verbosity,
 703                    "%d", ntohs(om->icmp_type));
 704         print_wild(&f, "icmp_code=", w & OFPFW_ICMP_CODE, verbosity,
 705                    "%d", ntohs(om->icmp_code));
 706     } else {
 707         print_wild(&f, "tp_src=", w & OFPFW_TP_SRC, verbosity,
 708                    "%d", ntohs(om->tp_src));
 709         print_wild(&f, "tp_dst=", w & OFPFW_TP_DST, verbosity,
 710                    "%d", ntohs(om->tp_dst));
 711     }
 712     return ds_cstr(&f);
 713 }
 714
 715 /* Pretty-print the OFPT_FLOW_MOD packet of 'len' bytes at 'oh' to 'string'
 716  * at the given 'verbosity' level. */
 717 static void
 718 ofp_print_flow_mod(struct ds *string, const void *oh, size_t len,
 719                    int verbosity)
 720 {
 721     const struct ofp_flow_mod *ofm = oh;
 722
 723     ofp_print_match(string, &ofm->match, verbosity);
 724     switch (ntohs(ofm->command)) {
 725     case OFPFC_ADD:
 726         ds_put_cstr(string, " ADD: ");
 727         break;
 728     case OFPFC_MODIFY:
 729         ds_put_cstr(string, " MOD: ");
 730         break;
 731     case OFPFC_MODIFY_STRICT:
 732         ds_put_cstr(string, " MOD_STRICT: ");
 733         break;
 734     case OFPFC_DELETE:
 735         ds_put_cstr(string, " DEL: ");
 736         break;
 737     case OFPFC_DELETE_STRICT:
 738         ds_put_cstr(string, " DEL_STRICT: ");
 739         break;
 740     default:
 741         ds_put_format(string, " cmd:%d ", ntohs(ofm->command));
 742     }
 743     ds_put_format(string, "cookie:%"PRIx64" idle:%d hard:%d pri:%d "
 744             "buf:%#x flags:%"PRIx16" ", ntohll(ofm->cookie),
 745             ntohs(ofm->idle_timeout), ntohs(ofm->hard_timeout),
 746             ofm->match.wildcards ? ntohs(ofm->priority) : (uint16_t)-1,
 747             ntohl(ofm->buffer_id), ntohs(ofm->flags));
 748     ofp_print_actions(string, ofm->actions,
 749                       len - offsetof(struct ofp_flow_mod, actions));
 750     ds_put_char(string, '\n');
 751 }
 752
 753 /* Pretty-print the OFPT_FLOW_REMOVED packet of 'len' bytes at 'oh' to 'string'
 754  * at the given 'verbosity' level. */
 755 static void
 756 ofp_print_flow_removed(struct ds *string, const void *oh,
 757                        size_t len OVS_UNUSED, int verbosity)
 758 {
 759     const struct ofp_flow_removed *ofr = oh;
 760
 761     ofp_print_match(string, &ofr->match, verbosity);
 762     ds_put_cstr(string, " reason=");
 763     switch (ofr->reason) {
 764     case OFPRR_IDLE_TIMEOUT:
 765         ds_put_cstr(string, "idle");
 766         break;
 767     case OFPRR_HARD_TIMEOUT:
 768         ds_put_cstr(string, "hard");
 769         break;
 770     case OFPRR_DELETE:
 771         ds_put_cstr(string, "delete");
 772         break;
 773     default:
 774         ds_put_format(string, "**%"PRIu8"**", ofr->reason);
 775         break;
 776     }
 777     ds_put_format(string,
 778          " cookie%"PRIx64" pri%"PRIu16" secs%"PRIu32" nsecs%"PRIu32
 779          " idle%"PRIu16" pkts%"PRIu64" bytes%"PRIu64"\n",
 780          ntohll(ofr->cookie),
 781          ofr->match.wildcards ? ntohs(ofr->priority) : (uint16_t)-1,
 782          ntohl(ofr->duration_sec), ntohl(ofr->duration_nsec),
 783          ntohs(ofr->idle_timeout), ntohll(ofr->packet_count),
 784          ntohll(ofr->byte_count));
 785 }
 786
 787 static void
 788 ofp_print_port_mod(struct ds *string, const void *oh, size_t len OVS_UNUSED,
 789                    int verbosity OVS_UNUSED)
 790 {
 791     const struct ofp_port_mod *opm = oh;
 792
 793     ds_put_format(string, "port: %d: addr:"ETH_ADDR_FMT", config: %#x, mask:%#x\n",
 794             ntohs(opm->port_no), ETH_ADDR_ARGS(opm->hw_addr),
 795             ntohl(opm->config), ntohl(opm->mask));
 796     ds_put_format(string, "     advertise: ");
 797     if (opm->advertise) {
 798         ofp_print_port_features(string, ntohl(opm->advertise));
 799     } else {
 800         ds_put_format(string, "UNCHANGED\n");
 801     }
 802 }
 803
 804 struct error_type {
 805     int type;
 806     int code;
 807     const char *name;
 808 };
 809
 810 static const struct error_type error_types[] = {
 811 #define ERROR_TYPE(TYPE) {TYPE, -1, #TYPE}
 812 #define ERROR_CODE(TYPE, CODE) {TYPE, CODE, #CODE}
 813     ERROR_TYPE(OFPET_HELLO_FAILED),
 814     ERROR_CODE(OFPET_HELLO_FAILED, OFPHFC_INCOMPATIBLE),
 815     ERROR_CODE(OFPET_HELLO_FAILED, OFPHFC_EPERM),
 816
 817     ERROR_TYPE(OFPET_BAD_REQUEST),
 818     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_BAD_VERSION),
 819     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_BAD_TYPE),
 820     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_BAD_STAT),
 821     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_BAD_VENDOR),
 822     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_BAD_SUBTYPE),
 823     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_EPERM),
 824     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_BAD_LEN),
 825     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_BUFFER_EMPTY),
 826     ERROR_CODE(OFPET_BAD_REQUEST, OFPBRC_BUFFER_UNKNOWN),
 827
 828     ERROR_TYPE(OFPET_BAD_ACTION),
 829     ERROR_CODE(OFPET_BAD_ACTION, OFPBAC_BAD_TYPE),
 830     ERROR_CODE(OFPET_BAD_ACTION, OFPBAC_BAD_LEN),
 831     ERROR_CODE(OFPET_BAD_ACTION, OFPBAC_BAD_VENDOR),
 832     ERROR_CODE(OFPET_BAD_ACTION, OFPBAC_BAD_VENDOR_TYPE),
 833     ERROR_CODE(OFPET_BAD_ACTION, OFPBAC_BAD_OUT_PORT),
 834     ERROR_CODE(OFPET_BAD_ACTION, OFPBAC_BAD_ARGUMENT),
 835     ERROR_CODE(OFPET_BAD_ACTION, OFPBAC_EPERM),
 836     ERROR_CODE(OFPET_BAD_ACTION, OFPBAC_TOO_MANY),
 837
 838     ERROR_TYPE(OFPET_FLOW_MOD_FAILED),
 839     ERROR_CODE(OFPET_FLOW_MOD_FAILED, OFPFMFC_ALL_TABLES_FULL),
 840     ERROR_CODE(OFPET_FLOW_MOD_FAILED, OFPFMFC_OVERLAP),
 841     ERROR_CODE(OFPET_FLOW_MOD_FAILED, OFPFMFC_EPERM),
 842     ERROR_CODE(OFPET_FLOW_MOD_FAILED, OFPFMFC_BAD_EMERG_TIMEOUT),
 843     ERROR_CODE(OFPET_FLOW_MOD_FAILED, OFPFMFC_BAD_COMMAND),
 844
 845     ERROR_TYPE(OFPET_PORT_MOD_FAILED),
 846     ERROR_CODE(OFPET_PORT_MOD_FAILED, OFPPMFC_BAD_PORT),
 847     ERROR_CODE(OFPET_PORT_MOD_FAILED, OFPPMFC_BAD_HW_ADDR)
 848 };
 849 #define N_ERROR_TYPES ARRAY_SIZE(error_types)
 850
 851 static const char *
 852 lookup_error_type(int type)
 853 {
 854     const struct error_type *t;
 855
 856     for (t = error_types; t < &error_types[N_ERROR_TYPES]; t++) {
 857         if (t->type == type && t->code == -1) {
 858             return t->name;
 859         }
 860     }
 861     return "?";
 862 }
 863
 864 static const char *
 865 lookup_error_code(int type, int code)
 866 {
 867     const struct error_type *t;
 868
 869     for (t = error_types; t < &error_types[N_ERROR_TYPES]; t++) {
 870         if (t->type == type && t->code == code) {
 871             return t->name;
 872         }
 873     }
 874     return "?";
 875 }
 876
 877 /* Pretty-print the OFPT_ERROR packet of 'len' bytes at 'oh' to 'string'
 878  * at the given 'verbosity' level. */
 879 static void
 880 ofp_print_error_msg(struct ds *string, const void *oh, size_t len,
 881                        int verbosity OVS_UNUSED)
 882 {
 883     const struct ofp_error_msg *oem = oh;
 884     int type = ntohs(oem->type);
 885     int code = ntohs(oem->code);
 886     char *s;
 887
 888     ds_put_format(string, " type%d(%s) code%d(%s) payload:\n",
 889                   type, lookup_error_type(type),
 890                   code, lookup_error_code(type, code));
 891
 892     switch (type) {
 893     case OFPET_HELLO_FAILED:
 894         ds_put_printable(string, (char *) oem->data, len - sizeof *oem);
 895         break;
 896
 897     case OFPET_BAD_REQUEST:
 898         s = ofp_to_string(oem->data, len - sizeof *oem, 1);
 899         ds_put_cstr(string, s);
 900         free(s);
 901         break;
 902
 903     default:
 904         ds_put_hex_dump(string, oem->data, len - sizeof *oem, 0, true);
 905         break;
 906     }
 907 }
 908
 909 /* Pretty-print the OFPT_PORT_STATUS packet of 'len' bytes at 'oh' to 'string'
 910  * at the given 'verbosity' level. */
 911 static void
 912 ofp_print_port_status(struct ds *string, const void *oh, size_t len OVS_UNUSED,
 913                       int verbosity OVS_UNUSED)
 914 {
 915     const struct ofp_port_status *ops = oh;
 916
 917     if (ops->reason == OFPPR_ADD) {
 918         ds_put_format(string, " ADD:");
 919     } else if (ops->reason == OFPPR_DELETE) {
 920         ds_put_format(string, " DEL:");
 921     } else if (ops->reason == OFPPR_MODIFY) {
 922         ds_put_format(string, " MOD:");
 923     }
 924
 925     ofp_print_phy_port(string, &ops->desc);
 926 }
 927
 928 static void
 929 ofp_desc_stats_reply(struct ds *string, const void *body,
 930                      size_t len OVS_UNUSED, int verbosity OVS_UNUSED)
 931 {
 932     const struct ofp_desc_stats *ods = body;
 933
 934     ds_put_format(string, "Manufacturer: %s\n", ods->mfr_desc);
 935     ds_put_format(string, "Hardware: %s\n", ods->hw_desc);
 936     ds_put_format(string, "Software: %s\n", ods->sw_desc);
 937     ds_put_format(string, "Serial Num: %s\n", ods->serial_num);
 938     ds_put_format(string, "DP Description: %s\n", ods->dp_desc);
 939 }
 940
 941 static void
 942 ofp_flow_stats_request(struct ds *string, const void *oh,
 943                        size_t len OVS_UNUSED, int verbosity)
 944 {
 945     const struct ofp_flow_stats_request *fsr = oh;
 946
 947     if (fsr->table_id == 0xff) {
 948         ds_put_format(string, " table_id=any, ");
 949     } else {
 950         ds_put_format(string, " table_id=%"PRIu8", ", fsr->table_id);
 951     }
 952
 953     ofp_print_match(string, &fsr->match, verbosity);
 954 }
 955
 956 static void
 957 ofp_flow_stats_reply(struct ds *string, const void *body_, size_t len,
 958                      int verbosity)
 959 {
 960     const char *body = body_;
 961     const char *pos = body;
 962     for (;;) {
 963         const struct ofp_flow_stats *fs;
 964         ptrdiff_t bytes_left = body + len - pos;
 965         size_t length;
 966
 967         if (bytes_left < sizeof *fs) {
 968             if (bytes_left != 0) {
 969                 ds_put_format(string, " ***%td leftover bytes at end***",
 970                               bytes_left);
 971             }
 972             break;
 973         }
 974
 975         fs = (const void *) pos;
 976         length = ntohs(fs->length);
 977         if (length < sizeof *fs) {
 978             ds_put_format(string, " ***length=%zu shorter than minimum %zu***",
 979                           length, sizeof *fs);
 980             break;
 981         } else if (length > bytes_left) {
 982             ds_put_format(string,
 983                           " ***length=%zu but only %td bytes left***",
 984                           length, bytes_left);
 985             break;
 986         } else if ((length - sizeof *fs) % sizeof fs->actions[0]) {
 987             ds_put_format(string,
 988                           " ***length=%zu has %zu bytes leftover in "
 989                           "final action***",
 990                           length,
 991                           (length - sizeof *fs) % sizeof fs->actions[0]);
 992             break;
 993         }
 994
 995         ds_put_format(string, "  cookie=%"PRIu64"s, ", ntohll(fs->cookie));
 996         ds_put_format(string, "duration_sec=%"PRIu32"s, ",
 997                     ntohl(fs->duration_sec));
 998         ds_put_format(string, "duration_nsec=%"PRIu32"s, ",
 999                     ntohl(fs->duration_nsec));
1000         ds_put_format(string, "table_id=%"PRIu8", ", fs->table_id);
1001         ds_put_format(string, "priority=%"PRIu16", ",
1002                     fs->match.wildcards ? ntohs(fs->priority) : (uint16_t)-1);
1003         ds_put_format(string, "n_packets=%"PRIu64", ",
1004                     ntohll(fs->packet_count));
1005         ds_put_format(string, "n_bytes=%"PRIu64", ", ntohll(fs->byte_count));
1006         if (fs->idle_timeout != htons(OFP_FLOW_PERMANENT)) {
1007             ds_put_format(string, "idle_timeout=%"PRIu16",",
1008                           ntohs(fs->idle_timeout));
1009         }
1010         if (fs->hard_timeout != htons(OFP_FLOW_PERMANENT)) {
1011             ds_put_format(string, "hard_timeout=%"PRIu16",",
1012                           ntohs(fs->hard_timeout));
1013         }
1014         ofp_print_match(string, &fs->match, verbosity);
1015         ofp_print_actions(string, fs->actions, length - sizeof *fs);
1016         ds_put_char(string, '\n');
1017
1018         pos += length;
1019      }
1020 }
1021
1022 static void
1023 ofp_aggregate_stats_request(struct ds *string, const void *oh,
1024                             size_t len OVS_UNUSED, int verbosity)
1025 {
1026     const struct ofp_aggregate_stats_request *asr = oh;
1027
1028     if (asr->table_id == 0xff) {
1029         ds_put_format(string, " table_id=any, ");
1030     } else {
1031         ds_put_format(string, " table_id=%"PRIu8", ", asr->table_id);
1032     }
1033
1034     ofp_print_match(string, &asr->match, verbosity);
1035 }
1036
1037 static void
1038 ofp_aggregate_stats_reply(struct ds *string, const void *body_,
1039                           size_t len OVS_UNUSED, int verbosity OVS_UNUSED)
1040 {
1041     const struct ofp_aggregate_stats_reply *asr = body_;
1042
1043     ds_put_format(string, " packet_count=%"PRIu64, ntohll(asr->packet_count));
1044     ds_put_format(string, " byte_count=%"PRIu64, ntohll(asr->byte_count));
1045     ds_put_format(string, " flow_count=%"PRIu32, ntohl(asr->flow_count));
1046 }
1047
1048 static void print_port_stat(struct ds *string, const char *leader,
1049                             uint64_t stat, int more)
1050 {
1051     ds_put_cstr(string, leader);
1052     if (stat != -1) {
1053         ds_put_format(string, "%"PRIu64, stat);
1054     } else {
1055         ds_put_char(string, '?');
1056     }
1057     if (more) {
1058         ds_put_cstr(string, ", ");
1059     } else {
1060         ds_put_cstr(string, "\n");
1061     }
1062 }
1063
1064 static void
1065 ofp_port_stats_reply(struct ds *string, const void *body, size_t len,
1066                      int verbosity)
1067 {
1068     const struct ofp_port_stats *ps = body;
1069     size_t n = len / sizeof *ps;
1070     ds_put_format(string, " %zu ports\n", n);
1071     if (verbosity < 1) {
1072         return;
1073     }
1074
1075     for (; n--; ps++) {
1076         ds_put_format(string, "  port %2"PRIu16": ", ntohs(ps->port_no));
1077
1078         ds_put_cstr(string, "rx ");
1079         print_port_stat(string, "pkts=", ntohll(ps->rx_packets), 1);
1080         print_port_stat(string, "bytes=", ntohll(ps->rx_bytes), 1);
1081         print_port_stat(string, "drop=", ntohll(ps->rx_dropped), 1);
1082         print_port_stat(string, "errs=", ntohll(ps->rx_errors), 1);
1083         print_port_stat(string, "frame=", ntohll(ps->rx_frame_err), 1);
1084         print_port_stat(string, "over=", ntohll(ps->rx_over_err), 1);
1085         print_port_stat(string, "crc=", ntohll(ps->rx_crc_err), 0);
1086
1087         ds_put_cstr(string, "           tx ");
1088         print_port_stat(string, "pkts=", ntohll(ps->tx_packets), 1);
1089         print_port_stat(string, "bytes=", ntohll(ps->tx_bytes), 1);
1090         print_port_stat(string, "drop=", ntohll(ps->tx_dropped), 1);
1091         print_port_stat(string, "errs=", ntohll(ps->tx_errors), 1);
1092         print_port_stat(string, "coll=", ntohll(ps->collisions), 0);
1093     }
1094 }
1095
1096 static void
1097 ofp_table_stats_reply(struct ds *string, const void *body, size_t len,
1098                      int verbosity)
1099 {
1100     const struct ofp_table_stats *ts = body;
1101     size_t n = len / sizeof *ts;
1102     ds_put_format(string, " %zu tables\n", n);
1103     if (verbosity < 1) {
1104         return;
1105     }
1106
1107     for (; n--; ts++) {
1108         char name[OFP_MAX_TABLE_NAME_LEN + 1];
1109         strncpy(name, ts->name, sizeof name);
1110         name[OFP_MAX_TABLE_NAME_LEN] = '\0';
1111
1112         ds_put_format(string, "  %d: %-8s: ", ts->table_id, name);
1113         ds_put_format(string, "wild=0x%05"PRIx32", ", ntohl(ts->wildcards));
1114         ds_put_format(string, "max=%6"PRIu32", ", ntohl(ts->max_entries));
1115         ds_put_format(string, "active=%"PRIu32"\n", ntohl(ts->active_count));
1116         ds_put_cstr(string, "               ");
1117         ds_put_format(string, "lookup=%"PRIu64", ",
1118                     ntohll(ts->lookup_count));
1119         ds_put_format(string, "matched=%"PRIu64"\n",
1120                     ntohll(ts->matched_count));
1121      }
1122 }
1123
1124 static void
1125 vendor_stat(struct ds *string, const void *body, size_t len,
1126             int verbosity OVS_UNUSED)
1127 {
1128     ds_put_format(string, " vendor=%08"PRIx32, ntohl(*(uint32_t *) body));
1129     ds_put_format(string, " %zu bytes additional data",
1130                   len - sizeof(uint32_t));
1131 }
1132
1133 enum stats_direction {
1134     REQUEST,
1135     REPLY
1136 };
1137
1138 static void
1139 print_stats(struct ds *string, int type, const void *body, size_t body_len,
1140             int verbosity, enum stats_direction direction)
1141 {
1142     struct stats_msg {
1143         size_t min_body, max_body;
1144         void (*printer)(struct ds *, const void *, size_t len, int verbosity);
1145     };
1146
1147     struct stats_type {
1148         int type;
1149         const char *name;
1150         struct stats_msg request;
1151         struct stats_msg reply;
1152     };
1153
1154     static const struct stats_type stats_types[] = {
1155         {
1156             OFPST_DESC,
1157             "description",
1158             { 0, 0, NULL },
1159             { 0, SIZE_MAX, ofp_desc_stats_reply },
1160         },
1161         {
1162             OFPST_FLOW,
1163             "flow",
1164             { sizeof(struct ofp_flow_stats_request),
1165               sizeof(struct ofp_flow_stats_request),
1166               ofp_flow_stats_request },
1167             { 0, SIZE_MAX, ofp_flow_stats_reply },
1168         },
1169         {
1170             OFPST_AGGREGATE,
1171             "aggregate",
1172             { sizeof(struct ofp_aggregate_stats_request),
1173               sizeof(struct ofp_aggregate_stats_request),
1174               ofp_aggregate_stats_request },
1175             { sizeof(struct ofp_aggregate_stats_reply),
1176               sizeof(struct ofp_aggregate_stats_reply),
1177               ofp_aggregate_stats_reply },
1178         },
1179         {
1180             OFPST_TABLE,
1181             "table",
1182             { 0, 0, NULL },
1183             { 0, SIZE_MAX, ofp_table_stats_reply },
1184         },
1185         {
1186             OFPST_PORT,
1187             "port",
1188             { 0, 0, NULL, },
1189             { 0, SIZE_MAX, ofp_port_stats_reply },
1190         },
1191         {
1192             OFPST_VENDOR,
1193             "vendor-specific",
1194             { sizeof(uint32_t), SIZE_MAX, vendor_stat },
1195             { sizeof(uint32_t), SIZE_MAX, vendor_stat },
1196         },
1197         {
1198             -1,
1199             "unknown",
1200             { 0, 0, NULL, },
1201             { 0, 0, NULL, },
1202         },
1203     };
1204
1205     const struct stats_type *s;
1206     const struct stats_msg *m;
1207
1208     if (type >= ARRAY_SIZE(stats_types) || !stats_types[type].name) {
1209         ds_put_format(string, " ***unknown type %d***", type);
1210         return;
1211     }
1212     for (s = stats_types; s->type >= 0; s++) {
1213         if (s->type == type) {
1214             break;
1215         }
1216     }
1217     ds_put_format(string, " type=%d(%s)\n", type, s->name);
1218
1219     m = direction == REQUEST ? &s->request : &s->reply;
1220     if (body_len < m->min_body || body_len > m->max_body) {
1221         ds_put_format(string, " ***body_len=%zu not in %zu...%zu***",
1222                       body_len, m->min_body, m->max_body);
1223         return;
1224     }
1225     if (m->printer) {
1226         m->printer(string, body, body_len, verbosity);
1227     }
1228 }
1229
1230 static void
1231 ofp_stats_request(struct ds *string, const void *oh, size_t len, int verbosity)
1232 {
1233     const struct ofp_stats_request *srq = oh;
1234
1235     if (srq->flags) {
1236         ds_put_format(string, " ***unknown flags 0x%04"PRIx16"***",
1237                       ntohs(srq->flags));
1238     }
1239
1240     print_stats(string, ntohs(srq->type), srq->body,
1241                 len - offsetof(struct ofp_stats_request, body),
1242                 verbosity, REQUEST);
1243 }
1244
1245 static void
1246 ofp_stats_reply(struct ds *string, const void *oh, size_t len, int verbosity)
1247 {
1248     const struct ofp_stats_reply *srp = oh;
1249
1250     ds_put_cstr(string, " flags=");
1251     if (!srp->flags) {
1252         ds_put_cstr(string, "none");
1253     } else {
1254         uint16_t flags = ntohs(srp->flags);
1255         if (flags & OFPSF_REPLY_MORE) {
1256             ds_put_cstr(string, "[more]");
1257             flags &= ~OFPSF_REPLY_MORE;
1258         }
1259         if (flags) {
1260             ds_put_format(string, "[***unknown flags 0x%04"PRIx16"***]", flags);
1261         }
1262     }
1263
1264     print_stats(string, ntohs(srp->type), srp->body,
1265                 len - offsetof(struct ofp_stats_reply, body),
1266                 verbosity, REPLY);
1267 }
1268
1269 static void
1270 ofp_echo(struct ds *string, const void *oh, size_t len, int verbosity)
1271 {
1272     const struct ofp_header *hdr = oh;
1273
1274     ds_put_format(string, " %zu bytes of payload\n", len - sizeof *hdr);
1275     if (verbosity > 1) {
1276         ds_put_hex_dump(string, hdr, len - sizeof *hdr, 0, true);
1277     }
1278 }
1279
1280 struct openflow_packet {
1281     uint8_t type;
1282     const char *name;
1283     size_t min_size;
1284     void (*printer)(struct ds *, const void *, size_t len, int verbosity);
1285 };
1286
1287 static const struct openflow_packet packets[] = {
1288     {
1289         OFPT_HELLO,
1290         "hello",
1291         sizeof (struct ofp_header),
1292         NULL,
1293     },
1294     {
1295         OFPT_FEATURES_REQUEST,
1296         "features_request",
1297         sizeof (struct ofp_header),
1298         NULL,
1299     },
1300     {
1301         OFPT_FEATURES_REPLY,
1302         "features_reply",
1303         sizeof (struct ofp_switch_features),
1304         ofp_print_switch_features,
1305     },
1306     {
1307         OFPT_GET_CONFIG_REQUEST,
1308         "get_config_request",
1309         sizeof (struct ofp_header),
1310         NULL,
1311     },
1312     {
1313         OFPT_GET_CONFIG_REPLY,
1314         "get_config_reply",
1315         sizeof (struct ofp_switch_config),
1316         ofp_print_switch_config,
1317     },
1318     {
1319         OFPT_SET_CONFIG,
1320         "set_config",
1321         sizeof (struct ofp_switch_config),
1322         ofp_print_switch_config,
1323     },
1324     {
1325         OFPT_PACKET_IN,
1326         "packet_in",
1327         offsetof(struct ofp_packet_in, data),
1328         ofp_packet_in,
1329     },
1330     {
1331         OFPT_PACKET_OUT,
1332         "packet_out",
1333         sizeof (struct ofp_packet_out),
1334         ofp_packet_out,
1335     },
1336     {
1337         OFPT_FLOW_MOD,
1338         "flow_mod",
1339         sizeof (struct ofp_flow_mod),
1340         ofp_print_flow_mod,
1341     },
1342     {
1343         OFPT_FLOW_REMOVED,
1344         "flow_removed",
1345         sizeof (struct ofp_flow_removed),
1346         ofp_print_flow_removed,
1347     },
1348     {
1349         OFPT_PORT_MOD,
1350         "port_mod",
1351         sizeof (struct ofp_port_mod),
1352         ofp_print_port_mod,
1353     },
1354     {
1355         OFPT_PORT_STATUS,
1356         "port_status",
1357         sizeof (struct ofp_port_status),
1358         ofp_print_port_status
1359     },
1360     {
1361         OFPT_ERROR,
1362         "error_msg",
1363         sizeof (struct ofp_error_msg),
1364         ofp_print_error_msg,
1365     },
1366     {
1367         OFPT_STATS_REQUEST,
1368         "stats_request",
1369         sizeof (struct ofp_stats_request),
1370         ofp_stats_request,
1371     },
1372     {
1373         OFPT_STATS_REPLY,
1374         "stats_reply",
1375         sizeof (struct ofp_stats_reply),
1376         ofp_stats_reply,
1377     },
1378     {
1379         OFPT_ECHO_REQUEST,
1380         "echo_request",
1381         sizeof (struct ofp_header),
1382         ofp_echo,
1383     },
1384     {
1385         OFPT_ECHO_REPLY,
1386         "echo_reply",
1387         sizeof (struct ofp_header),
1388         ofp_echo,
1389     },
1390     {
1391         OFPT_VENDOR,
1392         "vendor",
1393         sizeof (struct ofp_vendor_header),
1394         NULL,
1395     },
1396     {
1397         OFPT_BARRIER_REQUEST,
1398         "barrier_request",
1399         sizeof (struct ofp_header),
1400         NULL,
1401     },
1402     {
1403         OFPT_BARRIER_REPLY,
1404         "barrier_reply",
1405         sizeof (struct ofp_header),
1406         NULL,
1407     }
1408 };
1409
1410 /* Composes and returns a string representing the OpenFlow packet of 'len'
1411  * bytes at 'oh' at the given 'verbosity' level.  0 is a minimal amount of
1412  * verbosity and higher numbers increase verbosity.  The caller is responsible
1413  * for freeing the string. */
1414 char *
1415 ofp_to_string(const void *oh_, size_t len, int verbosity)
1416 {
1417     struct ds string = DS_EMPTY_INITIALIZER;
1418     const struct ofp_header *oh = oh_;
1419     const struct openflow_packet *pkt;
1420
1421     if (len < sizeof(struct ofp_header)) {
1422         ds_put_cstr(&string, "OpenFlow packet too short:\n");
1423         ds_put_hex_dump(&string, oh, len, 0, true);
1424         return ds_cstr(&string);
1425     } else if (oh->version != OFP_VERSION) {
1426         ds_put_format(&string, "Bad OpenFlow version %"PRIu8":\n", oh->version);
1427         ds_put_hex_dump(&string, oh, len, 0, true);
1428         return ds_cstr(&string);
1429     }
1430
1431     for (pkt = packets; ; pkt++) {
1432         if (pkt >= &packets[ARRAY_SIZE(packets)]) {
1433             ds_put_format(&string, "Unknown OpenFlow packet type %"PRIu8":\n",
1434                           oh->type);
1435             ds_put_hex_dump(&string, oh, len, 0, true);
1436             return ds_cstr(&string);
1437         } else if (oh->type == pkt->type) {
1438             break;
1439         }
1440     }
1441
1442     ds_put_format(&string, "%s (xid=0x%"PRIx32"):", pkt->name, oh->xid);
1443
1444     if (ntohs(oh->length) > len)
1445         ds_put_format(&string, " (***truncated to %zu bytes from %"PRIu16"***)",
1446                 len, ntohs(oh->length));
1447     else if (ntohs(oh->length) < len) {
1448         ds_put_format(&string, " (***only uses %"PRIu16" bytes out of %zu***)\n",
1449                 ntohs(oh->length), len);
1450         len = ntohs(oh->length);
1451     }
1452
1453     if (len < pkt->min_size) {
1454         ds_put_format(&string, " (***length=%zu < min_size=%zu***)\n",
1455                 len, pkt->min_size);
1456     } else if (!pkt->printer) {
1457         if (len > sizeof *oh) {
1458             ds_put_format(&string, " length=%"PRIu16" (decoder not implemented)\n",
1459                           ntohs(oh->length));
1460         }
1461     } else {
1462         pkt->printer(&string, oh, len, verbosity);
1463     }
1464     if (verbosity >= 3) {
1465         ds_put_hex_dump(&string, oh, len, 0, true);
1466     }
1467     if (string.string[string.length - 1] != '\n') {
1468         ds_put_char(&string, '\n');
1469     }
1470     return ds_cstr(&string);
1471 }
1472
1473 /* Returns the name for the specified OpenFlow message type as a string,
1474  * e.g. "OFPT_FEATURES_REPLY".  If no name is known, the string returned is a
1475  * hex number, e.g. "0x55".
1476  *
1477  * The caller must free the returned string when it is no longer needed. */
1478 char *
1479 ofp_message_type_to_string(uint8_t type)
1480 {
1481     struct ds s = DS_EMPTY_INITIALIZER;
1482     const struct openflow_packet *pkt;
1483     for (pkt = packets; ; pkt++) {
1484         if (pkt >= &packets[ARRAY_SIZE(packets)]) {
1485             ds_put_format(&s, "0x%02"PRIx8, type);
1486             break;
1487         } else if (type == pkt->type) {
1488             const char *p;
1489
1490             ds_put_cstr(&s, "OFPT_");
1491             for (p = pkt->name; *p; p++) {
1492                 ds_put_char(&s, toupper((unsigned char) *p));
1493             }
1494             break;
1495         }
1496     }
1497     return ds_cstr(&s);
1498 }
1499 \f
1500 static void
1501 print_and_free(FILE *stream, char *string)
1502 {
1503     fputs(string, stream);
1504     free(string);
1505 }
1506
1507 /* Pretty-print the OpenFlow packet of 'len' bytes at 'oh' to 'stream' at the
1508  * given 'verbosity' level.  0 is a minimal amount of verbosity and higher
1509  * numbers increase verbosity. */
1510 void
1511 ofp_print(FILE *stream, const void *oh, size_t len, int verbosity)
1512 {
1513     print_and_free(stream, ofp_to_string(oh, len, verbosity));
1514 }
1515
1516 /* Dumps the contents of the Ethernet frame in the 'len' bytes starting at
1517  * 'data' to 'stream' using tcpdump.  'total_len' specifies the full length of
1518  * the Ethernet frame (of which 'len' bytes were captured).
1519  *
1520  * This starts and kills a tcpdump subprocess so it's quite expensive. */
1521 void
1522 ofp_print_packet(FILE *stream, const void *data, size_t len, size_t total_len)
1523 {
1524     print_and_free(stream, ofp_packet_to_string(data, len, total_len));
1525 }