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         } else
 156                 print_portstate(rta_getattr_u8(attr));
 157 }
 158
 159
 160 /*
 161  * This is reported by HW devices that have some bridging
 162  * capabilities.
 163  */
 164 static void print_af_spec(FILE *fp, struct rtattr *attr)
 165 {
 166         struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
 167
 168         parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, attr);
 169
 170         if (aftb[IFLA_BRIDGE_MODE])
 171                 print_hwmode(rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
 172
 173         if (!show_details)
 174                 return;
 175
 176         if (aftb[IFLA_BRIDGE_VLAN_INFO])
 177                 print_vlan_info(fp, aftb[IFLA_BRIDGE_VLAN_INFO]);
 178 }
 179
 180 int print_linkinfo(const struct sockaddr_nl *who,
 181                    struct nlmsghdr *n, void *arg)
 182 {
 183         FILE *fp = arg;
 184         struct ifinfomsg *ifi = NLMSG_DATA(n);
 185         struct rtattr *tb[IFLA_MAX+1];
 186         unsigned int m_flag = 0;
 187         int len = n->nlmsg_len;
 188         const char *name;
 189
 190         len -= NLMSG_LENGTH(sizeof(*ifi));
 191         if (len < 0) {
 192                 fprintf(stderr, "Message too short!\n");
 193                 return -1;
 194         }
 195
 196         if (!(ifi->ifi_family == AF_BRIDGE || ifi->ifi_family == AF_UNSPEC))
 197                 return 0;
 198
 199         if (filter_index && filter_index != ifi->ifi_index)
 200                 return 0;
 201
 202         parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len, NLA_F_NESTED);
 203
 204         name = get_ifname_rta(ifi->ifi_index, tb[IFLA_IFNAME]);
 205         if (!name)
 206                 return -1;
 207
 208         open_json_object(NULL);
 209         if (n->nlmsg_type == RTM_DELLINK)
 210                 print_bool(PRINT_ANY, "deleted", "Deleted ", true);
 211
 212         print_int(PRINT_ANY, "ifindex", "%d: ", ifi->ifi_index);
 213         m_flag = print_name_and_link("%s: ", COLOR_IFNAME, name, tb);
 214         print_link_flags(fp, ifi->ifi_flags, m_flag);
 215
 216         if (tb[IFLA_MTU])
 217                 print_int(PRINT_ANY,
 218                           "mtu", "mtu %u ",
 219                           rta_getattr_u32(tb[IFLA_MTU]));
 220
 221         if (tb[IFLA_MASTER]) {
 222                 int master = rta_getattr_u32(tb[IFLA_MASTER]);
 223
 224                 print_string(PRINT_ANY, "master", "master %s ",
 225                              ll_index_to_name(master));
 226         }
 227
 228         if (tb[IFLA_PROTINFO])
 229                 print_protinfo(fp, tb[IFLA_PROTINFO]);
 230
 231         if (tb[IFLA_AF_SPEC])
 232                 print_af_spec(fp, tb[IFLA_AF_SPEC]);
 233
 234         print_string(PRINT_FP, NULL, "%s", "\n");
 235         close_json_object();
 236         fflush(fp);
 237         return 0;
 238 }
 239
 240 static void usage(void)
 241 {
 242         fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
 243         fprintf(stderr, "                               [ guard {on | off} ]\n");
 244         fprintf(stderr, "                               [ hairpin {on | off} ]\n");
 245         fprintf(stderr, "                               [ fastleave {on | off} ]\n");
 246         fprintf(stderr, "                               [ root_block {on | off} ]\n");
 247         fprintf(stderr, "                               [ learning {on | off} ]\n");
 248         fprintf(stderr, "                               [ learning_sync {on | off} ]\n");
 249         fprintf(stderr, "                               [ flood {on | off} ]\n");
 250         fprintf(stderr, "                               [ mcast_flood {on | off} ]\n");
 251         fprintf(stderr, "                               [ neigh_suppress {on | off} ]\n");
 252         fprintf(stderr, "                               [ vlan_tunnel {on | off} ]\n");
 253         fprintf(stderr, "                               [ hwmode {vepa | veb} ]\n");
 254         fprintf(stderr, "                               [ self ] [ master ]\n");
 255         fprintf(stderr, "       bridge link show [dev DEV]\n");
 256         exit(-1);
 257 }
 258
 259 static bool on_off(char *arg, __s8 *attr, char *val)
 260 {
 261         if (strcmp(val, "on") == 0)
 262                 *attr = 1;
 263         else if (strcmp(val, "off") == 0)
 264                 *attr = 0;
 265         else {
 266                 fprintf(stderr,
 267                         "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
 268                         arg);
 269                 return false;
 270         }
 271
 272         return true;
 273 }
 274
 275 static int brlink_modify(int argc, char **argv)
 276 {
 277         struct {
 278                 struct nlmsghdr  n;
 279                 struct ifinfomsg ifm;
 280                 char             buf[512];
 281         } req = {
 282                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 283                 .n.nlmsg_flags = NLM_F_REQUEST,
 284                 .n.nlmsg_type = RTM_SETLINK,
 285                 .ifm.ifi_family = PF_BRIDGE,
 286         };
 287         char *d = NULL;
 288         __s8 neigh_suppress = -1;
 289         __s8 learning = -1;
 290         __s8 learning_sync = -1;
 291         __s8 flood = -1;
 292         __s8 vlan_tunnel = -1;
 293         __s8 mcast_flood = -1;
 294         __s8 hairpin = -1;
 295         __s8 bpdu_guard = -1;
 296         __s8 fast_leave = -1;
 297         __s8 root_block = -1;
 298         __u32 cost = 0;
 299         __s16 priority = -1;
 300         __s8 state = -1;
 301         __s16 mode = -1;
 302         __u16 flags = 0;
 303         struct rtattr *nest;
 304
 305         while (argc > 0) {
 306                 if (strcmp(*argv, "dev") == 0) {
 307                         NEXT_ARG();
 308                         d = *argv;
 309                 } else if (strcmp(*argv, "guard") == 0) {
 310                         NEXT_ARG();
 311                         if (!on_off("guard", &bpdu_guard, *argv))
 312                                 return -1;
 313                 } else if (strcmp(*argv, "hairpin") == 0) {
 314                         NEXT_ARG();
 315                         if (!on_off("hairping", &hairpin, *argv))
 316                                 return -1;
 317                 } else if (strcmp(*argv, "fastleave") == 0) {
 318                         NEXT_ARG();
 319                         if (!on_off("fastleave", &fast_leave, *argv))
 320                                 return -1;
 321                 } else if (strcmp(*argv, "root_block") == 0) {
 322                         NEXT_ARG();
 323                         if (!on_off("root_block", &root_block, *argv))
 324                                 return -1;
 325                 } else if (strcmp(*argv, "learning") == 0) {
 326                         NEXT_ARG();
 327                         if (!on_off("learning", &learning, *argv))
 328                                 return -1;
 329                 } else if (strcmp(*argv, "learning_sync") == 0) {
 330                         NEXT_ARG();
 331                         if (!on_off("learning_sync", &learning_sync, *argv))
 332                                 return -1;
 333                 } else if (strcmp(*argv, "flood") == 0) {
 334                         NEXT_ARG();
 335                         if (!on_off("flood", &flood, *argv))
 336                                 return -1;
 337                 } else if (strcmp(*argv, "mcast_flood") == 0) {
 338                         NEXT_ARG();
 339                         if (!on_off("mcast_flood", &mcast_flood, *argv))
 340                                 return -1;
 341                 } else if (strcmp(*argv, "cost") == 0) {
 342                         NEXT_ARG();
 343                         cost = atoi(*argv);
 344                 } else if (strcmp(*argv, "priority") == 0) {
 345                         NEXT_ARG();
 346                         priority = atoi(*argv);
 347                 } else if (strcmp(*argv, "state") == 0) {
 348                         NEXT_ARG();
 349                         char *endptr;
 350                         size_t nstates = ARRAY_SIZE(port_states);
 351
 352                         state = strtol(*argv, &endptr, 10);
 353                         if (!(**argv != '\0' && *endptr == '\0')) {
 354                                 for (state = 0; state < nstates; state++)
 355                                         if (strcmp(port_states[state], *argv) == 0)
 356                                                 break;
 357                                 if (state == nstates) {
 358                                         fprintf(stderr,
 359                                                 "Error: invalid STP port state\n");
 360                                         return -1;
 361                                 }
 362                         }
 363                 } else if (strcmp(*argv, "hwmode") == 0) {
 364                         NEXT_ARG();
 365                         flags = BRIDGE_FLAGS_SELF;
 366                         if (strcmp(*argv, "vepa") == 0)
 367                                 mode = BRIDGE_MODE_VEPA;
 368                         else if (strcmp(*argv, "veb") == 0)
 369                                 mode = BRIDGE_MODE_VEB;
 370                         else {
 371                                 fprintf(stderr,
 372                                         "Mode argument must be \"vepa\" or \"veb\".\n");
 373                                 return -1;
 374                         }
 375                 } else if (strcmp(*argv, "self") == 0) {
 376                         flags |= BRIDGE_FLAGS_SELF;
 377                 } else if (strcmp(*argv, "master") == 0) {
 378                         flags |= BRIDGE_FLAGS_MASTER;
 379                 } else if (strcmp(*argv, "neigh_suppress") == 0) {
 380                         NEXT_ARG();
 381                         if (!on_off("neigh_suppress", &neigh_suppress,
 382                                     *argv))
 383                                 return -1;
 384                 } else if (strcmp(*argv, "vlan_tunnel") == 0) {
 385                         NEXT_ARG();
 386                         if (!on_off("vlan_tunnel", &vlan_tunnel,
 387                                     *argv))
 388                                 return -1;
 389                 } else {
 390                         usage();
 391                 }
 392                 argc--; argv++;
 393         }
 394         if (d == NULL) {
 395                 fprintf(stderr, "Device is a required argument.\n");
 396                 return -1;
 397         }
 398
 399
 400         req.ifm.ifi_index = ll_name_to_index(d);
 401         if (req.ifm.ifi_index == 0) {
 402                 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
 403                 return -1;
 404         }
 405
 406         /* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
 407          * state.
 408          */
 409         nest = addattr_nest(&req.n, sizeof(req),
 410                             IFLA_PROTINFO | NLA_F_NESTED);
 411         /* Flags first */
 412         if (bpdu_guard >= 0)
 413                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
 414         if (hairpin >= 0)
 415                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
 416         if (fast_leave >= 0)
 417                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
 418                          fast_leave);
 419         if (root_block >= 0)
 420                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
 421         if (flood >= 0)
 422                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
 423         if (mcast_flood >= 0)
 424                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MCAST_FLOOD,
 425                          mcast_flood);
 426         if (learning >= 0)
 427                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
 428         if (learning_sync >= 0)
 429                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
 430                          learning_sync);
 431
 432         if (cost > 0)
 433                 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
 434
 435         if (priority >= 0)
 436                 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
 437
 438         if (state >= 0)
 439                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
 440
 441         if (neigh_suppress != -1)
 442                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_NEIGH_SUPPRESS,
 443                          neigh_suppress);
 444         if (vlan_tunnel != -1)
 445                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_VLAN_TUNNEL,
 446                          vlan_tunnel);
 447
 448         addattr_nest_end(&req.n, nest);
 449
 450         /* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
 451          * designates master or self operation and IFLA_BRIDGE_MODE
 452          * for hw 'vepa' or 'veb' operation modes. The hwmodes are
 453          * only valid in 'self' mode on some devices so far.
 454          */
 455         if (mode >= 0 || flags > 0) {
 456                 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
 457
 458                 if (flags > 0)
 459                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
 460
 461                 if (mode >= 0)
 462                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
 463
 464                 addattr_nest_end(&req.n, nest);
 465         }
 466
 467         if (rtnl_talk(&rth, &req.n, NULL) < 0)
 468                 return -1;
 469
 470         return 0;
 471 }
 472
 473 static int brlink_show(int argc, char **argv)
 474 {
 475         char *filter_dev = NULL;
 476
 477         while (argc > 0) {
 478                 if (strcmp(*argv, "dev") == 0) {
 479                         NEXT_ARG();
 480                         if (filter_dev)
 481                                 duparg("dev", *argv);
 482                         filter_dev = *argv;
 483                 }
 484                 argc--; argv++;
 485         }
 486
 487         if (filter_dev) {
 488                 if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
 489                         fprintf(stderr, "Cannot find device \"%s\"\n",
 490                                 filter_dev);
 491                         return -1;
 492                 }
 493         }
 494
 495         if (show_details) {
 496                 if (rtnl_wilddump_req_filter(&rth, PF_BRIDGE, RTM_GETLINK,
 497                                              (compress_vlans ?
 498                                               RTEXT_FILTER_BRVLAN_COMPRESSED :
 499                                               RTEXT_FILTER_BRVLAN)) < 0) {
 500                         perror("Cannon send dump request");
 501                         exit(1);
 502                 }
 503         } else {
 504                 if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
 505                         perror("Cannon send dump request");
 506                         exit(1);
 507                 }
 508         }
 509
 510         new_json_obj(json);
 511         if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
 512                 fprintf(stderr, "Dump terminated\n");
 513                 exit(1);
 514         }
 515
 516         delete_json_obj();
 517         fflush(stdout);
 518         return 0;
 519 }
 520
 521 int do_link(int argc, char **argv)
 522 {
 523         ll_init_map(&rth);
 524         if (argc > 0) {
 525                 if (matches(*argv, "set") == 0 ||
 526                     matches(*argv, "change") == 0)
 527                         return brlink_modify(argc-1, argv+1);
 528                 if (matches(*argv, "show") == 0 ||
 529                     matches(*argv, "lst") == 0 ||
 530                     matches(*argv, "list") == 0)
 531                         return brlink_show(argc-1, argv+1);
 532                 if (matches(*argv, "help") == 0)
 533                         usage();
 534         } else
 535                 return brlink_show(0, NULL);
 536
 537         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
 538         exit(-1);
 539 }