bridge/link.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <time.h>
   7 #include <sys/socket.h>
   8 #include <sys/time.h>
   9 #include <netinet/in.h>
  10 #include <linux/if.h>
  11 #include <linux/if_bridge.h>
  12 #include <string.h>
  13 #include <stdbool.h>
  14
  15 #include "libnetlink.h"
  16 #include "utils.h"
  17 #include "br_common.h"
  18
  19 static unsigned int filter_index;
  20
  21 static const char *port_states[] = {
  22         [BR_STATE_DISABLED] = "disabled",
  23         [BR_STATE_LISTENING] = "listening",
  24         [BR_STATE_LEARNING] = "learning",
  25         [BR_STATE_FORWARDING] = "forwarding",
  26         [BR_STATE_BLOCKING] = "blocking",
  27 };
  28
  29 static void print_link_flags(FILE *fp, unsigned int flags)
  30 {
  31         fprintf(fp, "<");
  32         if (flags & IFF_UP && !(flags & IFF_RUNNING))
  33                 fprintf(fp, "NO-CARRIER%s", flags ? "," : "");
  34         flags &= ~IFF_RUNNING;
  35 #define _PF(f) if (flags&IFF_##f) { \
  36                   flags &= ~IFF_##f ; \
  37                   fprintf(fp, #f "%s", flags ? "," : ""); }
  38         _PF(LOOPBACK);
  39         _PF(BROADCAST);
  40         _PF(POINTOPOINT);
  41         _PF(MULTICAST);
  42         _PF(NOARP);
  43         _PF(ALLMULTI);
  44         _PF(PROMISC);
  45         _PF(MASTER);
  46         _PF(SLAVE);
  47         _PF(DEBUG);
  48         _PF(DYNAMIC);
  49         _PF(AUTOMEDIA);
  50         _PF(PORTSEL);
  51         _PF(NOTRAILERS);
  52         _PF(UP);
  53         _PF(LOWER_UP);
  54         _PF(DORMANT);
  55         _PF(ECHO);
  56 #undef _PF
  57         if (flags)
  58                 fprintf(fp, "%x", flags);
  59         fprintf(fp, "> ");
  60 }
  61
  62 static const char *oper_states[] = {
  63         "UNKNOWN", "NOTPRESENT", "DOWN", "LOWERLAYERDOWN",
  64         "TESTING", "DORMANT",    "UP"
  65 };
  66
  67 static const char *hw_mode[] = {"VEB", "VEPA"};
  68
  69 static void print_operstate(FILE *f, __u8 state)
  70 {
  71         if (state >= ARRAY_SIZE(oper_states))
  72                 fprintf(f, "state %#x ", state);
  73         else
  74                 fprintf(f, "state %s ", oper_states[state]);
  75 }
  76
  77 static void print_portstate(FILE *f, __u8 state)
  78 {
  79         if (state <= BR_STATE_BLOCKING)
  80                 fprintf(f, "state %s ", port_states[state]);
  81         else
  82                 fprintf(f, "state (%d) ", state);
  83 }
  84
  85 static void print_onoff(FILE *f, char *flag, __u8 val)
  86 {
  87         fprintf(f, "%s %s ", flag, val ? "on" : "off");
  88 }
  89
  90 static void print_hwmode(FILE *f, __u16 mode)
  91 {
  92         if (mode >= ARRAY_SIZE(hw_mode))
  93                 fprintf(f, "hwmode %#hx ", mode);
  94         else
  95                 fprintf(f, "hwmode %s ", hw_mode[mode]);
  96 }
  97
  98 int print_linkinfo(const struct sockaddr_nl *who,
  99                    struct nlmsghdr *n, void *arg)
 100 {
 101         FILE *fp = arg;
 102         int len = n->nlmsg_len;
 103         struct ifinfomsg *ifi = NLMSG_DATA(n);
 104         struct rtattr *tb[IFLA_MAX+1];
 105
 106         len -= NLMSG_LENGTH(sizeof(*ifi));
 107         if (len < 0) {
 108                 fprintf(stderr, "Message too short!\n");
 109                 return -1;
 110         }
 111
 112         if (!(ifi->ifi_family == AF_BRIDGE || ifi->ifi_family == AF_UNSPEC))
 113                 return 0;
 114
 115         if (filter_index && filter_index != ifi->ifi_index)
 116                 return 0;
 117
 118         parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len, NLA_F_NESTED);
 119
 120         if (tb[IFLA_IFNAME] == NULL) {
 121                 fprintf(stderr, "BUG: nil ifname\n");
 122                 return -1;
 123         }
 124
 125         if (n->nlmsg_type == RTM_DELLINK)
 126                 fprintf(fp, "Deleted ");
 127
 128         fprintf(fp, "%d: %s ", ifi->ifi_index,
 129                 tb[IFLA_IFNAME] ? rta_getattr_str(tb[IFLA_IFNAME]) : "<nil>");
 130
 131         if (tb[IFLA_OPERSTATE])
 132                 print_operstate(fp, rta_getattr_u8(tb[IFLA_OPERSTATE]));
 133
 134         if (tb[IFLA_LINK]) {
 135                 int iflink = rta_getattr_u32(tb[IFLA_LINK]);
 136
 137                 fprintf(fp, "@%s: ",
 138                         iflink ? ll_index_to_name(iflink) : "NONE");
 139         } else
 140                 fprintf(fp, ": ");
 141
 142         print_link_flags(fp, ifi->ifi_flags);
 143
 144         if (tb[IFLA_MTU])
 145                 fprintf(fp, "mtu %u ", rta_getattr_u32(tb[IFLA_MTU]));
 146
 147         if (tb[IFLA_MASTER]) {
 148                 int master = rta_getattr_u32(tb[IFLA_MASTER]);
 149
 150                 fprintf(fp, "master %s ", ll_index_to_name(master));
 151         }
 152
 153         if (tb[IFLA_PROTINFO]) {
 154                 if (tb[IFLA_PROTINFO]->rta_type & NLA_F_NESTED) {
 155                         struct rtattr *prtb[IFLA_BRPORT_MAX+1];
 156
 157                         parse_rtattr_nested(prtb, IFLA_BRPORT_MAX,
 158                                             tb[IFLA_PROTINFO]);
 159
 160                         if (prtb[IFLA_BRPORT_STATE])
 161                                 print_portstate(fp,
 162                                                 rta_getattr_u8(prtb[IFLA_BRPORT_STATE]));
 163                         if (prtb[IFLA_BRPORT_PRIORITY])
 164                                 fprintf(fp, "priority %hu ",
 165                                         rta_getattr_u16(prtb[IFLA_BRPORT_PRIORITY]));
 166                         if (prtb[IFLA_BRPORT_COST])
 167                                 fprintf(fp, "cost %u ",
 168                                         rta_getattr_u32(prtb[IFLA_BRPORT_COST]));
 169
 170                         if (show_details) {
 171                                 fprintf(fp, "%s    ", _SL_);
 172
 173                                 if (prtb[IFLA_BRPORT_MODE])
 174                                         print_onoff(fp, "hairpin",
 175                                                     rta_getattr_u8(prtb[IFLA_BRPORT_MODE]));
 176                                 if (prtb[IFLA_BRPORT_GUARD])
 177                                         print_onoff(fp, "guard",
 178                                                     rta_getattr_u8(prtb[IFLA_BRPORT_GUARD]));
 179                                 if (prtb[IFLA_BRPORT_PROTECT])
 180                                         print_onoff(fp, "root_block",
 181                                                     rta_getattr_u8(prtb[IFLA_BRPORT_PROTECT]));
 182                                 if (prtb[IFLA_BRPORT_FAST_LEAVE])
 183                                         print_onoff(fp, "fastleave",
 184                                                     rta_getattr_u8(prtb[IFLA_BRPORT_FAST_LEAVE]));
 185                                 if (prtb[IFLA_BRPORT_LEARNING])
 186                                         print_onoff(fp, "learning",
 187                                                     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING]));
 188                                 if (prtb[IFLA_BRPORT_LEARNING_SYNC])
 189                                         print_onoff(fp, "learning_sync",
 190                                                     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING_SYNC]));
 191                                 if (prtb[IFLA_BRPORT_UNICAST_FLOOD])
 192                                         print_onoff(fp, "flood",
 193                                                     rta_getattr_u8(prtb[IFLA_BRPORT_UNICAST_FLOOD]));
 194                                 if (prtb[IFLA_BRPORT_MCAST_FLOOD])
 195                                         print_onoff(fp, "mcast_flood",
 196                                                     rta_getattr_u8(prtb[IFLA_BRPORT_MCAST_FLOOD]));
 197                                 if (prtb[IFLA_BRPORT_NEIGH_SUPPRESS])
 198                                         print_onoff(fp, "neigh_suppress",
 199                                                     rta_getattr_u8(prtb[IFLA_BRPORT_NEIGH_SUPPRESS]));
 200                                 if (prtb[IFLA_BRPORT_VLAN_TUNNEL])
 201                                         print_onoff(fp, "vlan_tunnel",
 202                                                     rta_getattr_u8(prtb[IFLA_BRPORT_VLAN_TUNNEL]));
 203                         }
 204                 } else
 205                         print_portstate(fp, rta_getattr_u8(tb[IFLA_PROTINFO]));
 206         }
 207
 208         if (tb[IFLA_AF_SPEC]) {
 209                 /* This is reported by HW devices that have some bridging
 210                  * capabilities.
 211                  */
 212                 struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
 213
 214                 parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, tb[IFLA_AF_SPEC]);
 215
 216                 if (aftb[IFLA_BRIDGE_MODE])
 217                         print_hwmode(fp, rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
 218                 if (show_details) {
 219                         if (aftb[IFLA_BRIDGE_VLAN_INFO]) {
 220                                 fprintf(fp, "\n");
 221                                 print_vlan_info(fp, tb[IFLA_AF_SPEC],
 222                                                 ifi->ifi_index);
 223                         }
 224                 }
 225         }
 226
 227         fprintf(fp, "\n");
 228         fflush(fp);
 229         return 0;
 230 }
 231
 232 static void usage(void)
 233 {
 234         fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
 235         fprintf(stderr, "                               [ guard {on | off} ]\n");
 236         fprintf(stderr, "                               [ hairpin {on | off} ]\n");
 237         fprintf(stderr, "                               [ fastleave {on | off} ]\n");
 238         fprintf(stderr, "                               [ root_block {on | off} ]\n");
 239         fprintf(stderr, "                               [ learning {on | off} ]\n");
 240         fprintf(stderr, "                               [ learning_sync {on | off} ]\n");
 241         fprintf(stderr, "                               [ flood {on | off} ]\n");
 242         fprintf(stderr, "                               [ mcast_flood {on | off} ]\n");
 243         fprintf(stderr, "                               [ neigh_suppress {on | off} ]\n");
 244         fprintf(stderr, "                               [ vlan_tunnel {on | off} ]\n");
 245         fprintf(stderr, "                               [ hwmode {vepa | veb} ]\n");
 246         fprintf(stderr, "                               [ self ] [ master ]\n");
 247         fprintf(stderr, "       bridge link show [dev DEV]\n");
 248         exit(-1);
 249 }
 250
 251 static bool on_off(char *arg, __s8 *attr, char *val)
 252 {
 253         if (strcmp(val, "on") == 0)
 254                 *attr = 1;
 255         else if (strcmp(val, "off") == 0)
 256                 *attr = 0;
 257         else {
 258                 fprintf(stderr,
 259                         "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
 260                         arg);
 261                 return false;
 262         }
 263
 264         return true;
 265 }
 266
 267 static int brlink_modify(int argc, char **argv)
 268 {
 269         struct {
 270                 struct nlmsghdr  n;
 271                 struct ifinfomsg ifm;
 272                 char             buf[512];
 273         } req = {
 274                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 275                 .n.nlmsg_flags = NLM_F_REQUEST,
 276                 .n.nlmsg_type = RTM_SETLINK,
 277                 .ifm.ifi_family = PF_BRIDGE,
 278         };
 279         char *d = NULL;
 280         __s8 neigh_suppress = -1;
 281         __s8 learning = -1;
 282         __s8 learning_sync = -1;
 283         __s8 flood = -1;
 284         __s8 vlan_tunnel = -1;
 285         __s8 mcast_flood = -1;
 286         __s8 hairpin = -1;
 287         __s8 bpdu_guard = -1;
 288         __s8 fast_leave = -1;
 289         __s8 root_block = -1;
 290         __u32 cost = 0;
 291         __s16 priority = -1;
 292         __s8 state = -1;
 293         __s16 mode = -1;
 294         __u16 flags = 0;
 295         struct rtattr *nest;
 296
 297         while (argc > 0) {
 298                 if (strcmp(*argv, "dev") == 0) {
 299                         NEXT_ARG();
 300                         d = *argv;
 301                 } else if (strcmp(*argv, "guard") == 0) {
 302                         NEXT_ARG();
 303                         if (!on_off("guard", &bpdu_guard, *argv))
 304                                 return -1;
 305                 } else if (strcmp(*argv, "hairpin") == 0) {
 306                         NEXT_ARG();
 307                         if (!on_off("hairping", &hairpin, *argv))
 308                                 return -1;
 309                 } else if (strcmp(*argv, "fastleave") == 0) {
 310                         NEXT_ARG();
 311                         if (!on_off("fastleave", &fast_leave, *argv))
 312                                 return -1;
 313                 } else if (strcmp(*argv, "root_block") == 0) {
 314                         NEXT_ARG();
 315                         if (!on_off("root_block", &root_block, *argv))
 316                                 return -1;
 317                 } else if (strcmp(*argv, "learning") == 0) {
 318                         NEXT_ARG();
 319                         if (!on_off("learning", &learning, *argv))
 320                                 return -1;
 321                 } else if (strcmp(*argv, "learning_sync") == 0) {
 322                         NEXT_ARG();
 323                         if (!on_off("learning_sync", &learning_sync, *argv))
 324                                 return -1;
 325                 } else if (strcmp(*argv, "flood") == 0) {
 326                         NEXT_ARG();
 327                         if (!on_off("flood", &flood, *argv))
 328                                 return -1;
 329                 } else if (strcmp(*argv, "mcast_flood") == 0) {
 330                         NEXT_ARG();
 331                         if (!on_off("mcast_flood", &mcast_flood, *argv))
 332                                 return -1;
 333                 } else if (strcmp(*argv, "cost") == 0) {
 334                         NEXT_ARG();
 335                         cost = atoi(*argv);
 336                 } else if (strcmp(*argv, "priority") == 0) {
 337                         NEXT_ARG();
 338                         priority = atoi(*argv);
 339                 } else if (strcmp(*argv, "state") == 0) {
 340                         NEXT_ARG();
 341                         char *endptr;
 342                         size_t nstates = ARRAY_SIZE(port_states);
 343
 344                         state = strtol(*argv, &endptr, 10);
 345                         if (!(**argv != '\0' && *endptr == '\0')) {
 346                                 for (state = 0; state < nstates; state++)
 347                                         if (strcmp(port_states[state], *argv) == 0)
 348                                                 break;
 349                                 if (state == nstates) {
 350                                         fprintf(stderr,
 351                                                 "Error: invalid STP port state\n");
 352                                         return -1;
 353                                 }
 354                         }
 355                 } else if (strcmp(*argv, "hwmode") == 0) {
 356                         NEXT_ARG();
 357                         flags = BRIDGE_FLAGS_SELF;
 358                         if (strcmp(*argv, "vepa") == 0)
 359                                 mode = BRIDGE_MODE_VEPA;
 360                         else if (strcmp(*argv, "veb") == 0)
 361                                 mode = BRIDGE_MODE_VEB;
 362                         else {
 363                                 fprintf(stderr,
 364                                         "Mode argument must be \"vepa\" or \"veb\".\n");
 365                                 return -1;
 366                         }
 367                 } else if (strcmp(*argv, "self") == 0) {
 368                         flags |= BRIDGE_FLAGS_SELF;
 369                 } else if (strcmp(*argv, "master") == 0) {
 370                         flags |= BRIDGE_FLAGS_MASTER;
 371                 } else if (strcmp(*argv, "neigh_suppress") == 0) {
 372                         NEXT_ARG();
 373                         if (!on_off("neigh_suppress", &neigh_suppress,
 374                                     *argv))
 375                                 return -1;
 376                 } else if (strcmp(*argv, "vlan_tunnel") == 0) {
 377                         NEXT_ARG();
 378                         if (!on_off("vlan_tunnel", &vlan_tunnel,
 379                                     *argv))
 380                                 return -1;
 381                 } else {
 382                         usage();
 383                 }
 384                 argc--; argv++;
 385         }
 386         if (d == NULL) {
 387                 fprintf(stderr, "Device is a required argument.\n");
 388                 return -1;
 389         }
 390
 391
 392         req.ifm.ifi_index = ll_name_to_index(d);
 393         if (req.ifm.ifi_index == 0) {
 394                 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
 395                 return -1;
 396         }
 397
 398         /* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
 399          * state.
 400          */
 401         nest = addattr_nest(&req.n, sizeof(req),
 402                             IFLA_PROTINFO | NLA_F_NESTED);
 403         /* Flags first */
 404         if (bpdu_guard >= 0)
 405                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
 406         if (hairpin >= 0)
 407                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
 408         if (fast_leave >= 0)
 409                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
 410                          fast_leave);
 411         if (root_block >= 0)
 412                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
 413         if (flood >= 0)
 414                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
 415         if (mcast_flood >= 0)
 416                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MCAST_FLOOD,
 417                          mcast_flood);
 418         if (learning >= 0)
 419                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
 420         if (learning_sync >= 0)
 421                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
 422                          learning_sync);
 423
 424         if (cost > 0)
 425                 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
 426
 427         if (priority >= 0)
 428                 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
 429
 430         if (state >= 0)
 431                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
 432
 433         if (neigh_suppress != -1)
 434                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_NEIGH_SUPPRESS,
 435                          neigh_suppress);
 436         if (vlan_tunnel != -1)
 437                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_VLAN_TUNNEL,
 438                          vlan_tunnel);
 439
 440         addattr_nest_end(&req.n, nest);
 441
 442         /* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
 443          * designates master or self operation and IFLA_BRIDGE_MODE
 444          * for hw 'vepa' or 'veb' operation modes. The hwmodes are
 445          * only valid in 'self' mode on some devices so far.
 446          */
 447         if (mode >= 0 || flags > 0) {
 448                 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
 449
 450                 if (flags > 0)
 451                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
 452
 453                 if (mode >= 0)
 454                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
 455
 456                 addattr_nest_end(&req.n, nest);
 457         }
 458
 459         if (rtnl_talk(&rth, &req.n, NULL) < 0)
 460                 return -1;
 461
 462         return 0;
 463 }
 464
 465 static int brlink_show(int argc, char **argv)
 466 {
 467         char *filter_dev = NULL;
 468
 469         while (argc > 0) {
 470                 if (strcmp(*argv, "dev") == 0) {
 471                         NEXT_ARG();
 472                         if (filter_dev)
 473                                 duparg("dev", *argv);
 474                         filter_dev = *argv;
 475                 }
 476                 argc--; argv++;
 477         }
 478
 479         if (filter_dev) {
 480                 if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
 481                         fprintf(stderr, "Cannot find device \"%s\"\n",
 482                                 filter_dev);
 483                         return -1;
 484                 }
 485         }
 486
 487         if (show_details) {
 488                 if (rtnl_wilddump_req_filter(&rth, PF_BRIDGE, RTM_GETLINK,
 489                                              (compress_vlans ?
 490                                               RTEXT_FILTER_BRVLAN_COMPRESSED :
 491                                               RTEXT_FILTER_BRVLAN)) < 0) {
 492                         perror("Cannon send dump request");
 493                         exit(1);
 494                 }
 495         } else {
 496                 if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
 497                         perror("Cannon send dump request");
 498                         exit(1);
 499                 }
 500         }
 501
 502         if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
 503                 fprintf(stderr, "Dump terminated\n");
 504                 exit(1);
 505         }
 506         return 0;
 507 }
 508
 509 int do_link(int argc, char **argv)
 510 {
 511         ll_init_map(&rth);
 512         if (argc > 0) {
 513                 if (matches(*argv, "set") == 0 ||
 514                     matches(*argv, "change") == 0)
 515                         return brlink_modify(argc-1, argv+1);
 516                 if (matches(*argv, "show") == 0 ||
 517                     matches(*argv, "lst") == 0 ||
 518                     matches(*argv, "list") == 0)
 519                         return brlink_show(argc-1, argv+1);
 520                 if (matches(*argv, "help") == 0)
 521                         usage();
 522         } else
 523                 return brlink_show(0, NULL);
 524
 525         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
 526         exit(-1);
 527 }