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                         }
 199                 } else
 200                         print_portstate(fp, rta_getattr_u8(tb[IFLA_PROTINFO]));
 201         }
 202
 203         if (tb[IFLA_AF_SPEC]) {
 204                 /* This is reported by HW devices that have some bridging
 205                  * capabilities.
 206                  */
 207                 struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
 208
 209                 parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, tb[IFLA_AF_SPEC]);
 210
 211                 if (aftb[IFLA_BRIDGE_MODE])
 212                         print_hwmode(fp, rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
 213         }
 214
 215         fprintf(fp, "\n");
 216         fflush(fp);
 217         return 0;
 218 }
 219
 220 static void usage(void)
 221 {
 222         fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
 223         fprintf(stderr, "                               [ guard {on | off} ]\n");
 224         fprintf(stderr, "                               [ hairpin {on | off} ]\n");
 225         fprintf(stderr, "                               [ fastleave {on | off} ]\n");
 226         fprintf(stderr, "                               [ root_block {on | off} ]\n");
 227         fprintf(stderr, "                               [ learning {on | off} ]\n");
 228         fprintf(stderr, "                               [ learning_sync {on | off} ]\n");
 229         fprintf(stderr, "                               [ flood {on | off} ]\n");
 230         fprintf(stderr, "                               [ hwmode {vepa | veb} ]\n");
 231         fprintf(stderr, "                               [ self ] [ master ]\n");
 232         fprintf(stderr, "       bridge link show [dev DEV]\n");
 233         exit(-1);
 234 }
 235
 236 static bool on_off(char *arg, __s8 *attr, char *val)
 237 {
 238         if (strcmp(val, "on") == 0)
 239                 *attr = 1;
 240         else if (strcmp(val, "off") == 0)
 241                 *attr = 0;
 242         else {
 243                 fprintf(stderr,
 244                         "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
 245                         arg);
 246                 return false;
 247         }
 248
 249         return true;
 250 }
 251
 252 static int brlink_modify(int argc, char **argv)
 253 {
 254         struct {
 255                 struct nlmsghdr  n;
 256                 struct ifinfomsg ifm;
 257                 char             buf[512];
 258         } req;
 259         char *d = NULL;
 260         __s8 learning = -1;
 261         __s8 learning_sync = -1;
 262         __s8 flood = -1;
 263         __s8 hairpin = -1;
 264         __s8 bpdu_guard = -1;
 265         __s8 fast_leave = -1;
 266         __s8 root_block = -1;
 267         __u32 cost = 0;
 268         __s16 priority = -1;
 269         __s8 state = -1;
 270         __s16 mode = -1;
 271         __u16 flags = 0;
 272         struct rtattr *nest;
 273
 274         memset(&req, 0, sizeof(req));
 275
 276         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 277         req.n.nlmsg_flags = NLM_F_REQUEST;
 278         req.n.nlmsg_type = RTM_SETLINK;
 279         req.ifm.ifi_family = PF_BRIDGE;
 280
 281         while (argc > 0) {
 282                 if (strcmp(*argv, "dev") == 0) {
 283                         NEXT_ARG();
 284                         d = *argv;
 285                 } else if (strcmp(*argv, "guard") == 0) {
 286                         NEXT_ARG();
 287                         if (!on_off("guard", &bpdu_guard, *argv))
 288                                 return -1;
 289                 } else if (strcmp(*argv, "hairpin") == 0) {
 290                         NEXT_ARG();
 291                         if (!on_off("hairping", &hairpin, *argv))
 292                                 return -1;
 293                 } else if (strcmp(*argv, "fastleave") == 0) {
 294                         NEXT_ARG();
 295                         if (!on_off("fastleave", &fast_leave, *argv))
 296                                 return -1;
 297                 } else if (strcmp(*argv, "root_block") == 0) {
 298                         NEXT_ARG();
 299                         if (!on_off("root_block", &root_block, *argv))
 300                                 return -1;
 301                 } else if (strcmp(*argv, "learning") == 0) {
 302                         NEXT_ARG();
 303                         if (!on_off("learning", &learning, *argv))
 304                                 return -1;
 305                 } else if (strcmp(*argv, "learning_sync") == 0) {
 306                         NEXT_ARG();
 307                         if (!on_off("learning_sync", &learning_sync, *argv))
 308                                 return -1;
 309                 } else if (strcmp(*argv, "flood") == 0) {
 310                         NEXT_ARG();
 311                         if (!on_off("flood", &flood, *argv))
 312                                 return -1;
 313                 } else if (strcmp(*argv, "cost") == 0) {
 314                         NEXT_ARG();
 315                         cost = atoi(*argv);
 316                 } else if (strcmp(*argv, "priority") == 0) {
 317                         NEXT_ARG();
 318                         priority = atoi(*argv);
 319                 } else if (strcmp(*argv, "state") == 0) {
 320                         NEXT_ARG();
 321                         char *endptr;
 322                         size_t nstates = sizeof(port_states) / sizeof(*port_states);
 323
 324                         state = strtol(*argv, &endptr, 10);
 325                         if (!(**argv != '\0' && *endptr == '\0')) {
 326                                 for (state = 0; state < nstates; state++)
 327                                         if (strcmp(port_states[state], *argv) == 0)
 328                                                 break;
 329                                 if (state == nstates) {
 330                                         fprintf(stderr,
 331                                                 "Error: invalid STP port state\n");
 332                                         return -1;
 333                                 }
 334                         }
 335                 } else if (strcmp(*argv, "hwmode") == 0) {
 336                         NEXT_ARG();
 337                         flags = BRIDGE_FLAGS_SELF;
 338                         if (strcmp(*argv, "vepa") == 0)
 339                                 mode = BRIDGE_MODE_VEPA;
 340                         else if (strcmp(*argv, "veb") == 0)
 341                                 mode = BRIDGE_MODE_VEB;
 342                         else {
 343                                 fprintf(stderr,
 344                                         "Mode argument must be \"vepa\" or \"veb\".\n");
 345                                 return -1;
 346                         }
 347                 } else if (strcmp(*argv, "self") == 0) {
 348                         flags |= BRIDGE_FLAGS_SELF;
 349                 } else if (strcmp(*argv, "master") == 0) {
 350                         flags |= BRIDGE_FLAGS_MASTER;
 351                 } else {
 352                         usage();
 353                 }
 354                 argc--; argv++;
 355         }
 356         if (d == NULL) {
 357                 fprintf(stderr, "Device is a required argument.\n");
 358                 return -1;
 359         }
 360
 361
 362         req.ifm.ifi_index = ll_name_to_index(d);
 363         if (req.ifm.ifi_index == 0) {
 364                 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
 365                 return -1;
 366         }
 367
 368         /* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
 369          * state.
 370          */
 371         nest = addattr_nest(&req.n, sizeof(req),
 372                             IFLA_PROTINFO | NLA_F_NESTED);
 373         /* Flags first */
 374         if (bpdu_guard >= 0)
 375                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
 376         if (hairpin >= 0)
 377                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
 378         if (fast_leave >= 0)
 379                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
 380                          fast_leave);
 381         if (root_block >= 0)
 382                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
 383         if (flood >= 0)
 384                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
 385         if (learning >= 0)
 386                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
 387         if (learning_sync >= 0)
 388                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
 389                          learning_sync);
 390
 391         if (cost > 0)
 392                 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
 393
 394         if (priority >= 0)
 395                 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
 396
 397         if (state >= 0)
 398                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
 399
 400         addattr_nest_end(&req.n, nest);
 401
 402         /* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
 403          * designates master or self operation and IFLA_BRIDGE_MODE
 404          * for hw 'vepa' or 'veb' operation modes. The hwmodes are
 405          * only valid in 'self' mode on some devices so far.
 406          */
 407         if (mode >= 0 || flags > 0) {
 408                 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
 409
 410                 if (flags > 0)
 411                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
 412
 413                 if (mode >= 0)
 414                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
 415
 416                 addattr_nest_end(&req.n, nest);
 417         }
 418
 419         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 420                 return -1;
 421
 422         return 0;
 423 }
 424
 425 static int brlink_show(int argc, char **argv)
 426 {
 427         char *filter_dev = NULL;
 428
 429         while (argc > 0) {
 430                 if (strcmp(*argv, "dev") == 0) {
 431                         NEXT_ARG();
 432                         if (filter_dev)
 433                                 duparg("dev", *argv);
 434                         filter_dev = *argv;
 435                 }
 436                 argc--; argv++;
 437         }
 438
 439         if (filter_dev) {
 440                 if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
 441                         fprintf(stderr, "Cannot find device \"%s\"\n",
 442                                 filter_dev);
 443                         return -1;
 444                 }
 445         }
 446
 447         if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
 448                 perror("Cannon send dump request");
 449                 exit(1);
 450         }
 451
 452         if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
 453                 fprintf(stderr, "Dump terminated\n");
 454                 exit(1);
 455         }
 456         return 0;
 457 }
 458
 459 int do_link(int argc, char **argv)
 460 {
 461         ll_init_map(&rth);
 462         if (argc > 0) {
 463                 if (matches(*argv, "set") == 0 ||
 464                     matches(*argv, "change") == 0)
 465                         return brlink_modify(argc-1, argv+1);
 466                 if (matches(*argv, "show") == 0 ||
 467                     matches(*argv, "lst") == 0 ||
 468                     matches(*argv, "list") == 0)
 469                         return brlink_show(argc-1, argv+1);
 470                 if (matches(*argv, "help") == 0)
 471                         usage();
 472         } else
 473                 return brlink_show(0, NULL);
 474
 475         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
 476         exit(-1);
 477 }