bridge/link.c

   1
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <time.h>
   6 #include <sys/socket.h>
   7 #include <sys/time.h>
   8 #include <netinet/in.h>
   9 #include <linux/if.h>
  10 #include <linux/if_bridge.h>
  11 #include <string.h>
  12 #include <stdbool.h>
  13
  14 #include "libnetlink.h"
  15 #include "utils.h"
  16 #include "br_common.h"
  17
  18 static unsigned int filter_index;
  19
  20 static const char *port_states[] = {
  21         [BR_STATE_DISABLED] = "disabled",
  22         [BR_STATE_LISTENING] = "listening",
  23         [BR_STATE_LEARNING] = "learning",
  24         [BR_STATE_FORWARDING] = "forwarding",
  25         [BR_STATE_BLOCKING] = "blocking",
  26 };
  27
  28 extern char *if_indextoname(unsigned int __ifindex, char *__ifname);
  29
  30 static void print_link_flags(FILE *fp, unsigned int flags)
  31 {
  32         fprintf(fp, "<");
  33         if (flags & IFF_UP && !(flags & IFF_RUNNING))
  34                 fprintf(fp, "NO-CARRIER%s", flags ? "," : "");
  35         flags &= ~IFF_RUNNING;
  36 #define _PF(f) if (flags&IFF_##f) { \
  37                   flags &= ~IFF_##f ; \
  38                   fprintf(fp, #f "%s", flags ? "," : ""); }
  39         _PF(LOOPBACK);
  40         _PF(BROADCAST);
  41         _PF(POINTOPOINT);
  42         _PF(MULTICAST);
  43         _PF(NOARP);
  44         _PF(ALLMULTI);
  45         _PF(PROMISC);
  46         _PF(MASTER);
  47         _PF(SLAVE);
  48         _PF(DEBUG);
  49         _PF(DYNAMIC);
  50         _PF(AUTOMEDIA);
  51         _PF(PORTSEL);
  52         _PF(NOTRAILERS);
  53         _PF(UP);
  54         _PF(LOWER_UP);
  55         _PF(DORMANT);
  56         _PF(ECHO);
  57 #undef _PF
  58         if (flags)
  59                 fprintf(fp, "%x", flags);
  60         fprintf(fp, "> ");
  61 }
  62
  63 static const char *oper_states[] = {
  64         "UNKNOWN", "NOTPRESENT", "DOWN", "LOWERLAYERDOWN",
  65         "TESTING", "DORMANT",    "UP"
  66 };
  67
  68 static const char *hw_mode[] = {"VEB", "VEPA"};
  69
  70 static void print_operstate(FILE *f, __u8 state)
  71 {
  72         if (state >= ARRAY_SIZE(oper_states))
  73                 fprintf(f, "state %#x ", state);
  74         else
  75                 fprintf(f, "state %s ", oper_states[state]);
  76 }
  77
  78 static void print_portstate(FILE *f, __u8 state)
  79 {
  80         if (state <= BR_STATE_BLOCKING)
  81                 fprintf(f, "state %s ", port_states[state]);
  82         else
  83                 fprintf(f, "state (%d) ", state);
  84 }
  85
  86 static void print_onoff(FILE *f, char *flag, __u8 val)
  87 {
  88         fprintf(f, "%s %s ", flag, val ? "on" : "off");
  89 }
  90
  91 static void print_hwmode(FILE *f, __u16 mode)
  92 {
  93         if (mode >= ARRAY_SIZE(hw_mode))
  94                 fprintf(f, "hwmode %#hx ", mode);
  95         else
  96                 fprintf(f, "hwmode %s ", hw_mode[mode]);
  97 }
  98
  99 int print_linkinfo(const struct sockaddr_nl *who,
 100                    struct nlmsghdr *n, void *arg)
 101 {
 102         FILE *fp = arg;
 103         int len = n->nlmsg_len;
 104         struct ifinfomsg *ifi = NLMSG_DATA(n);
 105         struct rtattr *tb[IFLA_MAX+1];
 106         char b1[IFNAMSIZ];
 107
 108         len -= NLMSG_LENGTH(sizeof(*ifi));
 109         if (len < 0) {
 110                 fprintf(stderr, "Message too short!\n");
 111                 return -1;
 112         }
 113
 114         if (!(ifi->ifi_family == AF_BRIDGE || ifi->ifi_family == AF_UNSPEC))
 115                 return 0;
 116
 117         if (filter_index && filter_index != ifi->ifi_index)
 118                 return 0;
 119
 120         parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len, NLA_F_NESTED);
 121
 122         if (tb[IFLA_IFNAME] == NULL) {
 123                 fprintf(stderr, "BUG: nil ifname\n");
 124                 return -1;
 125         }
 126
 127         if (n->nlmsg_type == RTM_DELLINK)
 128                 fprintf(fp, "Deleted ");
 129
 130         fprintf(fp, "%d: %s ", ifi->ifi_index,
 131                 tb[IFLA_IFNAME] ? rta_getattr_str(tb[IFLA_IFNAME]) : "<nil>");
 132
 133         if (tb[IFLA_OPERSTATE])
 134                 print_operstate(fp, rta_getattr_u8(tb[IFLA_OPERSTATE]));
 135
 136         if (tb[IFLA_LINK]) {
 137                 SPRINT_BUF(b1);
 138                 int iflink = rta_getattr_u32(tb[IFLA_LINK]);
 139
 140                 if (iflink == 0)
 141                         fprintf(fp, "@NONE: ");
 142                 else
 143                         fprintf(fp, "@%s: ",
 144                                 if_indextoname(iflink, b1));
 145         } else
 146                 fprintf(fp, ": ");
 147
 148         print_link_flags(fp, ifi->ifi_flags);
 149
 150         if (tb[IFLA_MTU])
 151                 fprintf(fp, "mtu %u ", rta_getattr_u32(tb[IFLA_MTU]));
 152
 153         if (tb[IFLA_MASTER])
 154                 fprintf(fp, "master %s ",
 155                         if_indextoname(rta_getattr_u32(tb[IFLA_MASTER]), b1));
 156
 157         if (tb[IFLA_PROTINFO]) {
 158                 if (tb[IFLA_PROTINFO]->rta_type & NLA_F_NESTED) {
 159                         struct rtattr *prtb[IFLA_BRPORT_MAX+1];
 160
 161                         parse_rtattr_nested(prtb, IFLA_BRPORT_MAX,
 162                                             tb[IFLA_PROTINFO]);
 163
 164                         if (prtb[IFLA_BRPORT_STATE])
 165                                 print_portstate(fp,
 166                                                 rta_getattr_u8(prtb[IFLA_BRPORT_STATE]));
 167                         if (prtb[IFLA_BRPORT_PRIORITY])
 168                                 fprintf(fp, "priority %hu ",
 169                                         rta_getattr_u16(prtb[IFLA_BRPORT_PRIORITY]));
 170                         if (prtb[IFLA_BRPORT_COST])
 171                                 fprintf(fp, "cost %u ",
 172                                         rta_getattr_u32(prtb[IFLA_BRPORT_COST]));
 173
 174                         if (show_details) {
 175                                 fprintf(fp, "%s    ", _SL_);
 176
 177                                 if (prtb[IFLA_BRPORT_MODE])
 178                                         print_onoff(fp, "hairpin",
 179                                                     rta_getattr_u8(prtb[IFLA_BRPORT_MODE]));
 180                                 if (prtb[IFLA_BRPORT_GUARD])
 181                                         print_onoff(fp, "guard",
 182                                                     rta_getattr_u8(prtb[IFLA_BRPORT_GUARD]));
 183                                 if (prtb[IFLA_BRPORT_PROTECT])
 184                                         print_onoff(fp, "root_block",
 185                                                     rta_getattr_u8(prtb[IFLA_BRPORT_PROTECT]));
 186                                 if (prtb[IFLA_BRPORT_FAST_LEAVE])
 187                                         print_onoff(fp, "fastleave",
 188                                                     rta_getattr_u8(prtb[IFLA_BRPORT_FAST_LEAVE]));
 189                                 if (prtb[IFLA_BRPORT_LEARNING])
 190                                         print_onoff(fp, "learning",
 191                                                     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING]));
 192                                 if (prtb[IFLA_BRPORT_LEARNING_SYNC])
 193                                         print_onoff(fp, "learning_sync",
 194                                                     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING_SYNC]));
 195                                 if (prtb[IFLA_BRPORT_UNICAST_FLOOD])
 196                                         print_onoff(fp, "flood",
 197                                                     rta_getattr_u8(prtb[IFLA_BRPORT_UNICAST_FLOOD]));
 198                                 if (prtb[IFLA_BRPORT_MCAST_FLOOD])
 199                                         print_onoff(fp, "mcast_flood",
 200                                                     rta_getattr_u8(prtb[IFLA_BRPORT_MCAST_FLOOD]));
 201                         }
 202                 } else
 203                         print_portstate(fp, rta_getattr_u8(tb[IFLA_PROTINFO]));
 204         }
 205
 206         if (tb[IFLA_AF_SPEC]) {
 207                 /* This is reported by HW devices that have some bridging
 208                  * capabilities.
 209                  */
 210                 struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
 211
 212                 parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, tb[IFLA_AF_SPEC]);
 213
 214                 if (aftb[IFLA_BRIDGE_MODE])
 215                         print_hwmode(fp, rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
 216         }
 217
 218         fprintf(fp, "\n");
 219         fflush(fp);
 220         return 0;
 221 }
 222
 223 static void usage(void)
 224 {
 225         fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
 226         fprintf(stderr, "                               [ guard {on | off} ]\n");
 227         fprintf(stderr, "                               [ hairpin {on | off} ]\n");
 228         fprintf(stderr, "                               [ fastleave {on | off} ]\n");
 229         fprintf(stderr, "                               [ root_block {on | off} ]\n");
 230         fprintf(stderr, "                               [ learning {on | off} ]\n");
 231         fprintf(stderr, "                               [ learning_sync {on | off} ]\n");
 232         fprintf(stderr, "                               [ flood {on | off} ]\n");
 233         fprintf(stderr, "                               [ mcast_flood {on | off} ]\n");
 234         fprintf(stderr, "                               [ hwmode {vepa | veb} ]\n");
 235         fprintf(stderr, "                               [ self ] [ master ]\n");
 236         fprintf(stderr, "       bridge link show [dev DEV]\n");
 237         exit(-1);
 238 }
 239
 240 static bool on_off(char *arg, __s8 *attr, char *val)
 241 {
 242         if (strcmp(val, "on") == 0)
 243                 *attr = 1;
 244         else if (strcmp(val, "off") == 0)
 245                 *attr = 0;
 246         else {
 247                 fprintf(stderr,
 248                         "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
 249                         arg);
 250                 return false;
 251         }
 252
 253         return true;
 254 }
 255
 256 static int brlink_modify(int argc, char **argv)
 257 {
 258         struct {
 259                 struct nlmsghdr  n;
 260                 struct ifinfomsg ifm;
 261                 char             buf[512];
 262         } req = {
 263                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 264                 .n.nlmsg_flags = NLM_F_REQUEST,
 265                 .n.nlmsg_type = RTM_SETLINK,
 266                 .ifm.ifi_family = PF_BRIDGE,
 267         };
 268         char *d = NULL;
 269         __s8 learning = -1;
 270         __s8 learning_sync = -1;
 271         __s8 flood = -1;
 272         __s8 mcast_flood = -1;
 273         __s8 hairpin = -1;
 274         __s8 bpdu_guard = -1;
 275         __s8 fast_leave = -1;
 276         __s8 root_block = -1;
 277         __u32 cost = 0;
 278         __s16 priority = -1;
 279         __s8 state = -1;
 280         __s16 mode = -1;
 281         __u16 flags = 0;
 282         struct rtattr *nest;
 283
 284         while (argc > 0) {
 285                 if (strcmp(*argv, "dev") == 0) {
 286                         NEXT_ARG();
 287                         d = *argv;
 288                 } else if (strcmp(*argv, "guard") == 0) {
 289                         NEXT_ARG();
 290                         if (!on_off("guard", &bpdu_guard, *argv))
 291                                 return -1;
 292                 } else if (strcmp(*argv, "hairpin") == 0) {
 293                         NEXT_ARG();
 294                         if (!on_off("hairping", &hairpin, *argv))
 295                                 return -1;
 296                 } else if (strcmp(*argv, "fastleave") == 0) {
 297                         NEXT_ARG();
 298                         if (!on_off("fastleave", &fast_leave, *argv))
 299                                 return -1;
 300                 } else if (strcmp(*argv, "root_block") == 0) {
 301                         NEXT_ARG();
 302                         if (!on_off("root_block", &root_block, *argv))
 303                                 return -1;
 304                 } else if (strcmp(*argv, "learning") == 0) {
 305                         NEXT_ARG();
 306                         if (!on_off("learning", &learning, *argv))
 307                                 return -1;
 308                 } else if (strcmp(*argv, "learning_sync") == 0) {
 309                         NEXT_ARG();
 310                         if (!on_off("learning_sync", &learning_sync, *argv))
 311                                 return -1;
 312                 } else if (strcmp(*argv, "flood") == 0) {
 313                         NEXT_ARG();
 314                         if (!on_off("flood", &flood, *argv))
 315                                 return -1;
 316                 } else if (strcmp(*argv, "mcast_flood") == 0) {
 317                         NEXT_ARG();
 318                         if (!on_off("mcast_flood", &mcast_flood, *argv))
 319                                 return -1;
 320                 } else if (strcmp(*argv, "cost") == 0) {
 321                         NEXT_ARG();
 322                         cost = atoi(*argv);
 323                 } else if (strcmp(*argv, "priority") == 0) {
 324                         NEXT_ARG();
 325                         priority = atoi(*argv);
 326                 } else if (strcmp(*argv, "state") == 0) {
 327                         NEXT_ARG();
 328                         char *endptr;
 329                         size_t nstates = ARRAY_SIZE(port_states);
 330
 331                         state = strtol(*argv, &endptr, 10);
 332                         if (!(**argv != '\0' && *endptr == '\0')) {
 333                                 for (state = 0; state < nstates; state++)
 334                                         if (strcmp(port_states[state], *argv) == 0)
 335                                                 break;
 336                                 if (state == nstates) {
 337                                         fprintf(stderr,
 338                                                 "Error: invalid STP port state\n");
 339                                         return -1;
 340                                 }
 341                         }
 342                 } else if (strcmp(*argv, "hwmode") == 0) {
 343                         NEXT_ARG();
 344                         flags = BRIDGE_FLAGS_SELF;
 345                         if (strcmp(*argv, "vepa") == 0)
 346                                 mode = BRIDGE_MODE_VEPA;
 347                         else if (strcmp(*argv, "veb") == 0)
 348                                 mode = BRIDGE_MODE_VEB;
 349                         else {
 350                                 fprintf(stderr,
 351                                         "Mode argument must be \"vepa\" or \"veb\".\n");
 352                                 return -1;
 353                         }
 354                 } else if (strcmp(*argv, "self") == 0) {
 355                         flags |= BRIDGE_FLAGS_SELF;
 356                 } else if (strcmp(*argv, "master") == 0) {
 357                         flags |= BRIDGE_FLAGS_MASTER;
 358                 } else {
 359                         usage();
 360                 }
 361                 argc--; argv++;
 362         }
 363         if (d == NULL) {
 364                 fprintf(stderr, "Device is a required argument.\n");
 365                 return -1;
 366         }
 367
 368
 369         req.ifm.ifi_index = ll_name_to_index(d);
 370         if (req.ifm.ifi_index == 0) {
 371                 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
 372                 return -1;
 373         }
 374
 375         /* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
 376          * state.
 377          */
 378         nest = addattr_nest(&req.n, sizeof(req),
 379                             IFLA_PROTINFO | NLA_F_NESTED);
 380         /* Flags first */
 381         if (bpdu_guard >= 0)
 382                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
 383         if (hairpin >= 0)
 384                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
 385         if (fast_leave >= 0)
 386                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
 387                          fast_leave);
 388         if (root_block >= 0)
 389                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
 390         if (flood >= 0)
 391                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
 392         if (mcast_flood >= 0)
 393                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MCAST_FLOOD,
 394                          mcast_flood);
 395         if (learning >= 0)
 396                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
 397         if (learning_sync >= 0)
 398                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
 399                          learning_sync);
 400
 401         if (cost > 0)
 402                 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
 403
 404         if (priority >= 0)
 405                 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
 406
 407         if (state >= 0)
 408                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
 409
 410         addattr_nest_end(&req.n, nest);
 411
 412         /* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
 413          * designates master or self operation and IFLA_BRIDGE_MODE
 414          * for hw 'vepa' or 'veb' operation modes. The hwmodes are
 415          * only valid in 'self' mode on some devices so far.
 416          */
 417         if (mode >= 0 || flags > 0) {
 418                 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
 419
 420                 if (flags > 0)
 421                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
 422
 423                 if (mode >= 0)
 424                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
 425
 426                 addattr_nest_end(&req.n, nest);
 427         }
 428
 429         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 430                 return -1;
 431
 432         return 0;
 433 }
 434
 435 static int brlink_show(int argc, char **argv)
 436 {
 437         char *filter_dev = NULL;
 438
 439         while (argc > 0) {
 440                 if (strcmp(*argv, "dev") == 0) {
 441                         NEXT_ARG();
 442                         if (filter_dev)
 443                                 duparg("dev", *argv);
 444                         filter_dev = *argv;
 445                 }
 446                 argc--; argv++;
 447         }
 448
 449         if (filter_dev) {
 450                 if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
 451                         fprintf(stderr, "Cannot find device \"%s\"\n",
 452                                 filter_dev);
 453                         return -1;
 454                 }
 455         }
 456
 457         if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
 458                 perror("Cannon send dump request");
 459                 exit(1);
 460         }
 461
 462         if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
 463                 fprintf(stderr, "Dump terminated\n");
 464                 exit(1);
 465         }
 466         return 0;
 467 }
 468
 469 int do_link(int argc, char **argv)
 470 {
 471         ll_init_map(&rth);
 472         if (argc > 0) {
 473                 if (matches(*argv, "set") == 0 ||
 474                     matches(*argv, "change") == 0)
 475                         return brlink_modify(argc-1, argv+1);
 476                 if (matches(*argv, "show") == 0 ||
 477                     matches(*argv, "lst") == 0 ||
 478                     matches(*argv, "list") == 0)
 479                         return brlink_show(argc-1, argv+1);
 480                 if (matches(*argv, "help") == 0)
 481                         usage();
 482         } else
 483                 return brlink_show(0, NULL);
 484
 485         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
 486         exit(-1);
 487 }