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 "json_print.h"
  16 #include "libnetlink.h"
  17 #include "utils.h"
  18 #include "br_common.h"
  19
  20 static unsigned int filter_index;
  21
  22 static const char *port_states[] = {
  23         [BR_STATE_DISABLED] = "disabled",
  24         [BR_STATE_LISTENING] = "listening",
  25         [BR_STATE_LEARNING] = "learning",
  26         [BR_STATE_FORWARDING] = "forwarding",
  27         [BR_STATE_BLOCKING] = "blocking",
  28 };
  29
  30 static const char *hw_mode[] = {
  31         "VEB", "VEPA"
  32 };
  33
  34 static void print_link_flags(FILE *fp, unsigned int flags, unsigned int mdown)
  35 {
  36         open_json_array(PRINT_ANY, is_json_context() ? "flags" : "<");
  37         if (flags & IFF_UP && !(flags & IFF_RUNNING))
  38                 print_string(PRINT_ANY, NULL,
  39                              flags ? "%s," : "%s", "NO-CARRIER");
  40         flags &= ~IFF_RUNNING;
  41
  42 #define _PF(f) if (flags&IFF_##f) {                                     \
  43                 flags &= ~IFF_##f ;                                     \
  44                 print_string(PRINT_ANY, NULL, flags ? "%s," : "%s", #f); }
  45         _PF(LOOPBACK);
  46         _PF(BROADCAST);
  47         _PF(POINTOPOINT);
  48         _PF(MULTICAST);
  49         _PF(NOARP);
  50         _PF(ALLMULTI);
  51         _PF(PROMISC);
  52         _PF(MASTER);
  53         _PF(SLAVE);
  54         _PF(DEBUG);
  55         _PF(DYNAMIC);
  56         _PF(AUTOMEDIA);
  57         _PF(PORTSEL);
  58         _PF(NOTRAILERS);
  59         _PF(UP);
  60         _PF(LOWER_UP);
  61         _PF(DORMANT);
  62         _PF(ECHO);
  63 #undef _PF
  64         if (flags)
  65                 print_hex(PRINT_ANY, NULL, "%x", flags);
  66         if (mdown)
  67                 print_string(PRINT_ANY, NULL, ",%s", "M-DOWN");
  68         close_json_array(PRINT_ANY, "> ");
  69 }
  70
  71 static void print_portstate(__u8 state)
  72 {
  73         if (state <= BR_STATE_BLOCKING)
  74                 print_string(PRINT_ANY, "state",
  75                              "state %s ", port_states[state]);
  76         else
  77                 print_uint(PRINT_ANY, "state",
  78                              "state (%d) ", state);
  79 }
  80
  81 static void print_onoff(FILE *fp, const char *flag, __u8 val)
  82 {
  83         if (is_json_context())
  84                 print_bool(PRINT_JSON, flag, NULL, val);
  85         else
  86                 fprintf(fp, "%s %s ", flag, val ? "on" : "off");
  87 }
  88
  89 static void print_hwmode(__u16 mode)
  90 {
  91         if (mode >= ARRAY_SIZE(hw_mode))
  92                 print_0xhex(PRINT_ANY, "hwmode",
  93                             "hwmode %#hx ", mode);
  94         else
  95                 print_string(PRINT_ANY, "hwmode",
  96                              "hwmode %s ", hw_mode[mode]);
  97 }
  98
  99 static void print_protinfo(FILE *fp, struct rtattr *attr)
 100 {
 101         if (attr->rta_type & NLA_F_NESTED) {
 102                 struct rtattr *prtb[IFLA_BRPORT_MAX + 1];
 103
 104                 parse_rtattr_nested(prtb, IFLA_BRPORT_MAX, attr);
 105
 106                 if (prtb[IFLA_BRPORT_STATE])
 107                         print_portstate(rta_getattr_u8(prtb[IFLA_BRPORT_STATE]));
 108
 109                 if (prtb[IFLA_BRPORT_PRIORITY])
 110                         print_uint(PRINT_ANY, "priority",
 111                                    "priority %u ",
 112                                    rta_getattr_u16(prtb[IFLA_BRPORT_PRIORITY]));
 113
 114                 if (prtb[IFLA_BRPORT_COST])
 115                         print_uint(PRINT_ANY, "cost",
 116                                    "cost %u ",
 117                                    rta_getattr_u32(prtb[IFLA_BRPORT_COST]));
 118
 119                 if (!show_details)
 120                         return;
 121
 122                 if (!is_json_context())
 123                         fprintf(fp, "%s    ", _SL_);
 124
 125                 if (prtb[IFLA_BRPORT_MODE])
 126                         print_onoff(fp, "hairpin",
 127                                     rta_getattr_u8(prtb[IFLA_BRPORT_MODE]));
 128                 if (prtb[IFLA_BRPORT_GUARD])
 129                         print_onoff(fp, "guard",
 130                                     rta_getattr_u8(prtb[IFLA_BRPORT_GUARD]));
 131                 if (prtb[IFLA_BRPORT_PROTECT])
 132                         print_onoff(fp, "root_block",
 133                                     rta_getattr_u8(prtb[IFLA_BRPORT_PROTECT]));
 134                 if (prtb[IFLA_BRPORT_FAST_LEAVE])
 135                         print_onoff(fp, "fastleave",
 136                                     rta_getattr_u8(prtb[IFLA_BRPORT_FAST_LEAVE]));
 137                 if (prtb[IFLA_BRPORT_LEARNING])
 138                         print_onoff(fp, "learning",
 139                                     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING]));
 140                 if (prtb[IFLA_BRPORT_LEARNING_SYNC])
 141                         print_onoff(fp, "learning_sync",
 142                                     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING_SYNC]));
 143                 if (prtb[IFLA_BRPORT_UNICAST_FLOOD])
 144                         print_onoff(fp, "flood",
 145                                     rta_getattr_u8(prtb[IFLA_BRPORT_UNICAST_FLOOD]));
 146                 if (prtb[IFLA_BRPORT_MCAST_FLOOD])
 147                         print_onoff(fp, "mcast_flood",
 148                                     rta_getattr_u8(prtb[IFLA_BRPORT_MCAST_FLOOD]));
 149                 if (prtb[IFLA_BRPORT_NEIGH_SUPPRESS])
 150                         print_onoff(fp, "neigh_suppress",
 151                                     rta_getattr_u8(prtb[IFLA_BRPORT_NEIGH_SUPPRESS]));
 152                 if (prtb[IFLA_BRPORT_VLAN_TUNNEL])
 153                         print_onoff(fp, "vlan_tunnel",
 154                                     rta_getattr_u8(prtb[IFLA_BRPORT_VLAN_TUNNEL]));
 155                 if (prtb[IFLA_BRPORT_ISOLATED])
 156                         print_onoff(fp, "isolated",
 157                                     rta_getattr_u8(prtb[IFLA_BRPORT_ISOLATED]));
 158         } else
 159                 print_portstate(rta_getattr_u8(attr));
 160 }
 161
 162
 163 /*
 164  * This is reported by HW devices that have some bridging
 165  * capabilities.
 166  */
 167 static void print_af_spec(struct rtattr *attr, int ifindex)
 168 {
 169         struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
 170
 171         parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, attr);
 172
 173         if (aftb[IFLA_BRIDGE_MODE])
 174                 print_hwmode(rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
 175
 176         if (!show_details)
 177                 return;
 178
 179         if (aftb[IFLA_BRIDGE_VLAN_INFO])
 180                 print_vlan_info(aftb[IFLA_BRIDGE_VLAN_INFO], ifindex);
 181 }
 182
 183 int print_linkinfo(const struct sockaddr_nl *who,
 184                    struct nlmsghdr *n, void *arg)
 185 {
 186         FILE *fp = arg;
 187         struct ifinfomsg *ifi = NLMSG_DATA(n);
 188         struct rtattr *tb[IFLA_MAX+1];
 189         unsigned int m_flag = 0;
 190         int len = n->nlmsg_len;
 191         const char *name;
 192
 193         len -= NLMSG_LENGTH(sizeof(*ifi));
 194         if (len < 0) {
 195                 fprintf(stderr, "Message too short!\n");
 196                 return -1;
 197         }
 198
 199         if (!(ifi->ifi_family == AF_BRIDGE || ifi->ifi_family == AF_UNSPEC))
 200                 return 0;
 201
 202         if (filter_index && filter_index != ifi->ifi_index)
 203                 return 0;
 204
 205         parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len, NLA_F_NESTED);
 206
 207         name = get_ifname_rta(ifi->ifi_index, tb[IFLA_IFNAME]);
 208         if (!name)
 209                 return -1;
 210
 211         open_json_object(NULL);
 212         if (n->nlmsg_type == RTM_DELLINK)
 213                 print_bool(PRINT_ANY, "deleted", "Deleted ", true);
 214
 215         print_int(PRINT_ANY, "ifindex", "%d: ", ifi->ifi_index);
 216         m_flag = print_name_and_link("%s: ", name, tb);
 217         print_link_flags(fp, ifi->ifi_flags, m_flag);
 218
 219         if (tb[IFLA_MTU])
 220                 print_int(PRINT_ANY,
 221                           "mtu", "mtu %u ",
 222                           rta_getattr_u32(tb[IFLA_MTU]));
 223
 224         if (tb[IFLA_MASTER]) {
 225                 int master = rta_getattr_u32(tb[IFLA_MASTER]);
 226
 227                 print_string(PRINT_ANY, "master", "master %s ",
 228                              ll_index_to_name(master));
 229         }
 230
 231         if (tb[IFLA_PROTINFO])
 232                 print_protinfo(fp, tb[IFLA_PROTINFO]);
 233
 234         if (tb[IFLA_AF_SPEC])
 235                 print_af_spec(tb[IFLA_AF_SPEC], ifi->ifi_index);
 236
 237         print_string(PRINT_FP, NULL, "%s", "\n");
 238         close_json_object();
 239         fflush(fp);
 240         return 0;
 241 }
 242
 243 static void usage(void)
 244 {
 245         fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
 246         fprintf(stderr, "                               [ guard {on | off} ]\n");
 247         fprintf(stderr, "                               [ hairpin {on | off} ]\n");
 248         fprintf(stderr, "                               [ fastleave {on | off} ]\n");
 249         fprintf(stderr, "                               [ root_block {on | off} ]\n");
 250         fprintf(stderr, "                               [ learning {on | off} ]\n");
 251         fprintf(stderr, "                               [ learning_sync {on | off} ]\n");
 252         fprintf(stderr, "                               [ flood {on | off} ]\n");
 253         fprintf(stderr, "                               [ mcast_flood {on | off} ]\n");
 254         fprintf(stderr, "                               [ neigh_suppress {on | off} ]\n");
 255         fprintf(stderr, "                               [ vlan_tunnel {on | off} ]\n");
 256         fprintf(stderr, "                               [ isolated {on | off} ]\n");
 257         fprintf(stderr, "                               [ hwmode {vepa | veb} ]\n");
 258         fprintf(stderr, "                               [ self ] [ master ]\n");
 259         fprintf(stderr, "       bridge link show [dev DEV]\n");
 260         exit(-1);
 261 }
 262
 263 static bool on_off(char *arg, __s8 *attr, char *val)
 264 {
 265         if (strcmp(val, "on") == 0)
 266                 *attr = 1;
 267         else if (strcmp(val, "off") == 0)
 268                 *attr = 0;
 269         else {
 270                 fprintf(stderr,
 271                         "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
 272                         arg);
 273                 return false;
 274         }
 275
 276         return true;
 277 }
 278
 279 static int brlink_modify(int argc, char **argv)
 280 {
 281         struct {
 282                 struct nlmsghdr  n;
 283                 struct ifinfomsg ifm;
 284                 char             buf[512];
 285         } req = {
 286                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 287                 .n.nlmsg_flags = NLM_F_REQUEST,
 288                 .n.nlmsg_type = RTM_SETLINK,
 289                 .ifm.ifi_family = PF_BRIDGE,
 290         };
 291         char *d = NULL;
 292         __s8 neigh_suppress = -1;
 293         __s8 learning = -1;
 294         __s8 learning_sync = -1;
 295         __s8 flood = -1;
 296         __s8 vlan_tunnel = -1;
 297         __s8 mcast_flood = -1;
 298         __s8 isolated = -1;
 299         __s8 hairpin = -1;
 300         __s8 bpdu_guard = -1;
 301         __s8 fast_leave = -1;
 302         __s8 root_block = -1;
 303         __u32 cost = 0;
 304         __s16 priority = -1;
 305         __s8 state = -1;
 306         __s16 mode = -1;
 307         __u16 flags = 0;
 308         struct rtattr *nest;
 309
 310         while (argc > 0) {
 311                 if (strcmp(*argv, "dev") == 0) {
 312                         NEXT_ARG();
 313                         d = *argv;
 314                 } else if (strcmp(*argv, "guard") == 0) {
 315                         NEXT_ARG();
 316                         if (!on_off("guard", &bpdu_guard, *argv))
 317                                 return -1;
 318                 } else if (strcmp(*argv, "hairpin") == 0) {
 319                         NEXT_ARG();
 320                         if (!on_off("hairpin", &hairpin, *argv))
 321                                 return -1;
 322                 } else if (strcmp(*argv, "fastleave") == 0) {
 323                         NEXT_ARG();
 324                         if (!on_off("fastleave", &fast_leave, *argv))
 325                                 return -1;
 326                 } else if (strcmp(*argv, "root_block") == 0) {
 327                         NEXT_ARG();
 328                         if (!on_off("root_block", &root_block, *argv))
 329                                 return -1;
 330                 } else if (strcmp(*argv, "learning") == 0) {
 331                         NEXT_ARG();
 332                         if (!on_off("learning", &learning, *argv))
 333                                 return -1;
 334                 } else if (strcmp(*argv, "learning_sync") == 0) {
 335                         NEXT_ARG();
 336                         if (!on_off("learning_sync", &learning_sync, *argv))
 337                                 return -1;
 338                 } else if (strcmp(*argv, "flood") == 0) {
 339                         NEXT_ARG();
 340                         if (!on_off("flood", &flood, *argv))
 341                                 return -1;
 342                 } else if (strcmp(*argv, "mcast_flood") == 0) {
 343                         NEXT_ARG();
 344                         if (!on_off("mcast_flood", &mcast_flood, *argv))
 345                                 return -1;
 346                 } else if (strcmp(*argv, "cost") == 0) {
 347                         NEXT_ARG();
 348                         cost = atoi(*argv);
 349                 } else if (strcmp(*argv, "priority") == 0) {
 350                         NEXT_ARG();
 351                         priority = atoi(*argv);
 352                 } else if (strcmp(*argv, "state") == 0) {
 353                         NEXT_ARG();
 354                         char *endptr;
 355                         size_t nstates = ARRAY_SIZE(port_states);
 356
 357                         state = strtol(*argv, &endptr, 10);
 358                         if (!(**argv != '\0' && *endptr == '\0')) {
 359                                 for (state = 0; state < nstates; state++)
 360                                         if (strcmp(port_states[state], *argv) == 0)
 361                                                 break;
 362                                 if (state == nstates) {
 363                                         fprintf(stderr,
 364                                                 "Error: invalid STP port state\n");
 365                                         return -1;
 366                                 }
 367                         }
 368                 } else if (strcmp(*argv, "hwmode") == 0) {
 369                         NEXT_ARG();
 370                         flags = BRIDGE_FLAGS_SELF;
 371                         if (strcmp(*argv, "vepa") == 0)
 372                                 mode = BRIDGE_MODE_VEPA;
 373                         else if (strcmp(*argv, "veb") == 0)
 374                                 mode = BRIDGE_MODE_VEB;
 375                         else {
 376                                 fprintf(stderr,
 377                                         "Mode argument must be \"vepa\" or \"veb\".\n");
 378                                 return -1;
 379                         }
 380                 } else if (strcmp(*argv, "self") == 0) {
 381                         flags |= BRIDGE_FLAGS_SELF;
 382                 } else if (strcmp(*argv, "master") == 0) {
 383                         flags |= BRIDGE_FLAGS_MASTER;
 384                 } else if (strcmp(*argv, "neigh_suppress") == 0) {
 385                         NEXT_ARG();
 386                         if (!on_off("neigh_suppress", &neigh_suppress,
 387                                     *argv))
 388                                 return -1;
 389                 } else if (strcmp(*argv, "vlan_tunnel") == 0) {
 390                         NEXT_ARG();
 391                         if (!on_off("vlan_tunnel", &vlan_tunnel,
 392                                     *argv))
 393                                 return -1;
 394                 } else if (strcmp(*argv, "isolated") == 0) {
 395                         NEXT_ARG();
 396                         if (!on_off("isolated", &isolated, *argv))
 397                                 return -1;
 398                 } else {
 399                         usage();
 400                 }
 401                 argc--; argv++;
 402         }
 403         if (d == NULL) {
 404                 fprintf(stderr, "Device is a required argument.\n");
 405                 return -1;
 406         }
 407
 408
 409         req.ifm.ifi_index = ll_name_to_index(d);
 410         if (req.ifm.ifi_index == 0) {
 411                 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
 412                 return -1;
 413         }
 414
 415         /* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
 416          * state.
 417          */
 418         nest = addattr_nest(&req.n, sizeof(req),
 419                             IFLA_PROTINFO | NLA_F_NESTED);
 420         /* Flags first */
 421         if (bpdu_guard >= 0)
 422                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
 423         if (hairpin >= 0)
 424                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
 425         if (fast_leave >= 0)
 426                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
 427                          fast_leave);
 428         if (root_block >= 0)
 429                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
 430         if (flood >= 0)
 431                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
 432         if (mcast_flood >= 0)
 433                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MCAST_FLOOD,
 434                          mcast_flood);
 435         if (learning >= 0)
 436                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
 437         if (learning_sync >= 0)
 438                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
 439                          learning_sync);
 440
 441         if (cost > 0)
 442                 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
 443
 444         if (priority >= 0)
 445                 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
 446
 447         if (state >= 0)
 448                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
 449
 450         if (neigh_suppress != -1)
 451                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_NEIGH_SUPPRESS,
 452                          neigh_suppress);
 453         if (vlan_tunnel != -1)
 454                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_VLAN_TUNNEL,
 455                          vlan_tunnel);
 456         if (isolated != -1)
 457                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_ISOLATED, isolated);
 458
 459         addattr_nest_end(&req.n, nest);
 460
 461         /* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
 462          * designates master or self operation and IFLA_BRIDGE_MODE
 463          * for hw 'vepa' or 'veb' operation modes. The hwmodes are
 464          * only valid in 'self' mode on some devices so far.
 465          */
 466         if (mode >= 0 || flags > 0) {
 467                 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
 468
 469                 if (flags > 0)
 470                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
 471
 472                 if (mode >= 0)
 473                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
 474
 475                 addattr_nest_end(&req.n, nest);
 476         }
 477
 478         if (rtnl_talk(&rth, &req.n, NULL) < 0)
 479                 return -1;
 480
 481         return 0;
 482 }
 483
 484 static int brlink_show(int argc, char **argv)
 485 {
 486         char *filter_dev = NULL;
 487
 488         while (argc > 0) {
 489                 if (strcmp(*argv, "dev") == 0) {
 490                         NEXT_ARG();
 491                         if (filter_dev)
 492                                 duparg("dev", *argv);
 493                         filter_dev = *argv;
 494                 }
 495                 argc--; argv++;
 496         }
 497
 498         if (filter_dev) {
 499                 filter_index = ll_name_to_index(filter_dev);
 500                 if (!filter_index)
 501                         return nodev(filter_dev);
 502         }
 503
 504         if (show_details) {
 505                 if (rtnl_linkdump_req_filter(&rth, PF_BRIDGE,
 506                                              (compress_vlans ?
 507                                               RTEXT_FILTER_BRVLAN_COMPRESSED :
 508                                               RTEXT_FILTER_BRVLAN)) < 0) {
 509                         perror("Cannon send dump request");
 510                         exit(1);
 511                 }
 512         } else {
 513                 if (rtnl_linkdump_req(&rth, PF_BRIDGE) < 0) {
 514                         perror("Cannon send dump request");
 515                         exit(1);
 516                 }
 517         }
 518
 519         new_json_obj(json);
 520         if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
 521                 fprintf(stderr, "Dump terminated\n");
 522                 exit(1);
 523         }
 524
 525         delete_json_obj();
 526         fflush(stdout);
 527         return 0;
 528 }
 529
 530 int do_link(int argc, char **argv)
 531 {
 532         ll_init_map(&rth);
 533         if (argc > 0) {
 534                 if (matches(*argv, "set") == 0 ||
 535                     matches(*argv, "change") == 0)
 536                         return brlink_modify(argc-1, argv+1);
 537                 if (matches(*argv, "show") == 0 ||
 538                     matches(*argv, "lst") == 0 ||
 539                     matches(*argv, "list") == 0)
 540                         return brlink_show(argc-1, argv+1);
 541                 if (matches(*argv, "help") == 0)
 542                         usage();
 543         } else
 544                 return brlink_show(0, NULL);
 545
 546         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
 547         exit(-1);
 548 }