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 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 >= sizeof(oper_states)/sizeof(oper_states[0]))
  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 >= sizeof(hw_mode)/sizeof(hw_mode[0]))
  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                 if (iflink == 0)
 140                         fprintf(fp, "@NONE: ");
 141                 else
 142                         fprintf(fp, "@%s: ",
 143                                 if_indextoname(iflink, b1));
 144         } else
 145                 fprintf(fp, ": ");
 146
 147         print_link_flags(fp, ifi->ifi_flags);
 148
 149         if (tb[IFLA_MTU])
 150                 fprintf(fp, "mtu %u ", rta_getattr_u32(tb[IFLA_MTU]));
 151
 152         if (tb[IFLA_MASTER])
 153                 fprintf(fp, "master %s ",
 154                         if_indextoname(rta_getattr_u32(tb[IFLA_MASTER]), b1));
 155
 156         if (tb[IFLA_PROTINFO]) {
 157                 if (tb[IFLA_PROTINFO]->rta_type & NLA_F_NESTED) {
 158                         struct rtattr *prtb[IFLA_BRPORT_MAX+1];
 159
 160                         parse_rtattr_nested(prtb, IFLA_BRPORT_MAX,
 161                                             tb[IFLA_PROTINFO]);
 162
 163                         if (prtb[IFLA_BRPORT_STATE])
 164                                 print_portstate(fp,
 165                                                 rta_getattr_u8(prtb[IFLA_BRPORT_STATE]));
 166                         if (prtb[IFLA_BRPORT_PRIORITY])
 167                                 fprintf(fp, "priority %hu ",
 168                                         rta_getattr_u16(prtb[IFLA_BRPORT_PRIORITY]));
 169                         if (prtb[IFLA_BRPORT_COST])
 170                                 fprintf(fp, "cost %u ",
 171                                         rta_getattr_u32(prtb[IFLA_BRPORT_COST]));
 172
 173                         if (show_details) {
 174                                 fprintf(fp, "%s    ", _SL_);
 175
 176                                 if (prtb[IFLA_BRPORT_MODE])
 177                                         print_onoff(fp, "hairpin",
 178                                                     rta_getattr_u8(prtb[IFLA_BRPORT_MODE]));
 179                                 if (prtb[IFLA_BRPORT_GUARD])
 180                                         print_onoff(fp, "guard",
 181                                                     rta_getattr_u8(prtb[IFLA_BRPORT_GUARD]));
 182                                 if (prtb[IFLA_BRPORT_PROTECT])
 183                                         print_onoff(fp, "root_block",
 184                                                     rta_getattr_u8(prtb[IFLA_BRPORT_PROTECT]));
 185                                 if (prtb[IFLA_BRPORT_FAST_LEAVE])
 186                                         print_onoff(fp, "fastleave",
 187                                                     rta_getattr_u8(prtb[IFLA_BRPORT_FAST_LEAVE]));
 188                                 if (prtb[IFLA_BRPORT_LEARNING])
 189                                         print_onoff(fp, "learning",
 190                                                     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING]));
 191                                 if (prtb[IFLA_BRPORT_LEARNING_SYNC])
 192                                         print_onoff(fp, "learning_sync",
 193                                                     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING_SYNC]));
 194                                 if (prtb[IFLA_BRPORT_UNICAST_FLOOD])
 195                                         print_onoff(fp, "flood",
 196                                                     rta_getattr_u8(prtb[IFLA_BRPORT_UNICAST_FLOOD]));
 197                         }
 198                 } else
 199                         print_portstate(fp, rta_getattr_u8(tb[IFLA_PROTINFO]));
 200         }
 201
 202         if (tb[IFLA_AF_SPEC]) {
 203                 /* This is reported by HW devices that have some bridging
 204                  * capabilities.
 205                  */
 206                 struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
 207
 208                 parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, tb[IFLA_AF_SPEC]);
 209
 210                 if (aftb[IFLA_BRIDGE_MODE])
 211                         print_hwmode(fp, rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
 212         }
 213
 214         fprintf(fp, "\n");
 215         fflush(fp);
 216         return 0;
 217 }
 218
 219 static void usage(void)
 220 {
 221         fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
 222         fprintf(stderr, "                               [ guard {on | off} ]\n");
 223         fprintf(stderr, "                               [ hairpin {on | off} ] \n");
 224         fprintf(stderr, "                               [ fastleave {on | off} ]\n");
 225         fprintf(stderr, "                               [ root_block {on | off} ]\n");
 226         fprintf(stderr, "                               [ learning {on | off} ]\n");
 227         fprintf(stderr, "                               [ learning_sync {on | off} ]\n");
 228         fprintf(stderr, "                               [ flood {on | off} ]\n");
 229         fprintf(stderr, "                               [ hwmode {vepa | veb} ]\n");
 230         fprintf(stderr, "                               [ self ] [ master ]\n");
 231         fprintf(stderr, "       bridge link show [dev DEV]\n");
 232         exit(-1);
 233 }
 234
 235 static bool on_off(char *arg, __s8 *attr, char *val)
 236 {
 237         if (strcmp(val, "on") == 0)
 238                 *attr = 1;
 239         else if (strcmp(val, "off") == 0)
 240                 *attr = 0;
 241         else {
 242                 fprintf(stderr,
 243                         "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
 244                         arg);
 245                 return false;
 246         }
 247
 248         return true;
 249 }
 250
 251 static int brlink_modify(int argc, char **argv)
 252 {
 253         struct {
 254                 struct nlmsghdr  n;
 255                 struct ifinfomsg ifm;
 256                 char             buf[512];
 257         } req;
 258         char *d = NULL;
 259         __s8 learning = -1;
 260         __s8 learning_sync = -1;
 261         __s8 flood = -1;
 262         __s8 hairpin = -1;
 263         __s8 bpdu_guard = -1;
 264         __s8 fast_leave = -1;
 265         __s8 root_block = -1;
 266         __u32 cost = 0;
 267         __s16 priority = -1;
 268         __s8 state = -1;
 269         __s16 mode = -1;
 270         __u16 flags = 0;
 271         struct rtattr *nest;
 272
 273         memset(&req, 0, sizeof(req));
 274
 275         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 276         req.n.nlmsg_flags = NLM_F_REQUEST;
 277         req.n.nlmsg_type = RTM_SETLINK;
 278         req.ifm.ifi_family = PF_BRIDGE;
 279
 280         while (argc > 0) {
 281                 if (strcmp(*argv, "dev") == 0) {
 282                         NEXT_ARG();
 283                         d = *argv;
 284                 } else if (strcmp(*argv, "guard") == 0) {
 285                         NEXT_ARG();
 286                         if (!on_off("guard", &bpdu_guard, *argv))
 287                                 exit(-1);
 288                 } else if (strcmp(*argv, "hairpin") == 0) {
 289                         NEXT_ARG();
 290                         if (!on_off("hairping", &hairpin, *argv))
 291                                 exit(-1);
 292                 } else if (strcmp(*argv, "fastleave") == 0) {
 293                         NEXT_ARG();
 294                         if (!on_off("fastleave", &fast_leave, *argv))
 295                                 exit(-1);
 296                 } else if (strcmp(*argv, "root_block") == 0) {
 297                         NEXT_ARG();
 298                         if (!on_off("root_block", &root_block, *argv))
 299                                 exit(-1);
 300                 } else if (strcmp(*argv, "learning") == 0) {
 301                         NEXT_ARG();
 302                         if (!on_off("learning", &learning, *argv))
 303                                 exit(-1);
 304                 } else if (strcmp(*argv, "learning_sync") == 0) {
 305                         NEXT_ARG();
 306                         if (!on_off("learning_sync", &learning_sync, *argv))
 307                                 exit(-1);
 308                 } else if (strcmp(*argv, "flood") == 0) {
 309                         NEXT_ARG();
 310                         if (!on_off("flood", &flood, *argv))
 311                                 exit(-1);
 312                 } else if (strcmp(*argv, "cost") == 0) {
 313                         NEXT_ARG();
 314                         cost = atoi(*argv);
 315                 } else if (strcmp(*argv, "priority") == 0) {
 316                         NEXT_ARG();
 317                         priority = atoi(*argv);
 318                 } else if (strcmp(*argv, "state") == 0) {
 319                         NEXT_ARG();
 320                         char *endptr;
 321                         size_t nstates = sizeof(port_states) / sizeof(*port_states);
 322                         state = strtol(*argv, &endptr, 10);
 323                         if (!(**argv != '\0' && *endptr == '\0')) {
 324                                 for (state = 0; state < nstates; state++)
 325                                         if (strcmp(port_states[state], *argv) == 0)
 326                                                 break;
 327                                 if (state == nstates) {
 328                                         fprintf(stderr,
 329                                                 "Error: invalid STP port state\n");
 330                                         exit(-1);
 331                                 }
 332                         }
 333                 } else if (strcmp(*argv, "hwmode") == 0) {
 334                         NEXT_ARG();
 335                         flags = BRIDGE_FLAGS_SELF;
 336                         if (strcmp(*argv, "vepa") == 0)
 337                                 mode = BRIDGE_MODE_VEPA;
 338                         else if (strcmp(*argv, "veb") == 0)
 339                                 mode = BRIDGE_MODE_VEB;
 340                         else {
 341                                 fprintf(stderr,
 342                                         "Mode argument must be \"vepa\" or "
 343                                         "\"veb\".\n");
 344                                 exit(-1);
 345                         }
 346                 } else if (strcmp(*argv, "self") == 0) {
 347                         flags |= BRIDGE_FLAGS_SELF;
 348                 } else if (strcmp(*argv, "master") == 0) {
 349                         flags |= BRIDGE_FLAGS_MASTER;
 350                 } else {
 351                         usage();
 352                 }
 353                 argc--; argv++;
 354         }
 355         if (d == NULL) {
 356                 fprintf(stderr, "Device is a required argument.\n");
 357                 exit(-1);
 358         }
 359
 360
 361         req.ifm.ifi_index = ll_name_to_index(d);
 362         if (req.ifm.ifi_index == 0) {
 363                 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
 364                 exit(-1);
 365         }
 366
 367         /* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
 368          * state.
 369          */
 370         nest = addattr_nest(&req.n, sizeof(req),
 371                             IFLA_PROTINFO | NLA_F_NESTED);
 372         /* Flags first */
 373         if (bpdu_guard >= 0)
 374                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
 375         if (hairpin >= 0)
 376                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
 377         if (fast_leave >= 0)
 378                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
 379                          fast_leave);
 380         if (root_block >= 0)
 381                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
 382         if (flood >= 0)
 383                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
 384         if (learning >= 0)
 385                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
 386         if (learning_sync >= 0)
 387                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
 388                          learning_sync);
 389
 390         if (cost > 0)
 391                 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
 392
 393         if (priority >= 0)
 394                 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
 395
 396         if (state >= 0)
 397                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
 398
 399         addattr_nest_end(&req.n, nest);
 400
 401         /* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
 402          * designates master or self operation and IFLA_BRIDGE_MODE
 403          * for hw 'vepa' or 'veb' operation modes. The hwmodes are
 404          * only valid in 'self' mode on some devices so far.
 405          */
 406         if (mode >= 0 || flags > 0) {
 407                 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
 408
 409                 if (flags > 0)
 410                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
 411
 412                 if (mode >= 0)
 413                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
 414
 415                 addattr_nest_end(&req.n, nest);
 416         }
 417
 418         if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
 419                 exit(2);
 420
 421         return 0;
 422 }
 423
 424 static int brlink_show(int argc, char **argv)
 425 {
 426         char *filter_dev = NULL;
 427
 428         while (argc > 0) {
 429                 if (strcmp(*argv, "dev") == 0) {
 430                         NEXT_ARG();
 431                         if (filter_dev)
 432                                 duparg("dev", *argv);
 433                         filter_dev = *argv;
 434                 }
 435                 argc--; argv++;
 436         }
 437
 438         if (filter_dev) {
 439                 if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
 440                         fprintf(stderr, "Cannot find device \"%s\"\n",
 441                                 filter_dev);
 442                         return -1;
 443                 }
 444         }
 445
 446         if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
 447                 perror("Cannon send dump request");
 448                 exit(1);
 449         }
 450
 451         if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
 452                 fprintf(stderr, "Dump terminated\n");
 453                 exit(1);
 454         }
 455         return 0;
 456 }
 457
 458 int do_link(int argc, char **argv)
 459 {
 460         ll_init_map(&rth);
 461         if (argc > 0) {
 462                 if (matches(*argv, "set") == 0 ||
 463                     matches(*argv, "change") == 0)
 464                         return brlink_modify(argc-1, argv+1);
 465                 if (matches(*argv, "show") == 0 ||
 466                     matches(*argv, "lst") == 0 ||
 467                     matches(*argv, "list") == 0)
 468                         return brlink_show(argc-1, argv+1);
 469                 if (matches(*argv, "help") == 0)
 470                         usage();
 471         } else
 472                 return brlink_show(0, NULL);
 473
 474         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
 475         exit(-1);
 476 }