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 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                         }
 189                 } else
 190                         print_portstate(fp, rta_getattr_u8(tb[IFLA_PROTINFO]));
 191         }
 192
 193         if (tb[IFLA_AF_SPEC]) {
 194                 /* This is reported by HW devices that have some bridging
 195                  * capabilities.
 196                  */
 197                 struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
 198
 199                 parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, tb[IFLA_AF_SPEC]);
 200
 201                 if (tb[IFLA_BRIDGE_MODE])
 202                         print_hwmode(fp, rta_getattr_u16(tb[IFLA_BRIDGE_MODE]));
 203         }
 204
 205         fprintf(fp, "\n");
 206         fflush(fp);
 207         return 0;
 208 }
 209
 210 static void usage(void)
 211 {
 212         fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
 213         fprintf(stderr, "                               [ guard {on | off} ]\n");
 214         fprintf(stderr, "                               [ hairpin {on | off} ] \n");
 215         fprintf(stderr, "                               [ fastleave {on | off} ]\n");
 216         fprintf(stderr, "                               [ root_block {on | off} ]\n");
 217         fprintf(stderr, "                               [ hwmode {vepa | veb} ]\n");
 218         fprintf(stderr, "       bridge link show [dev DEV]\n");
 219         exit(-1);
 220 }
 221
 222 static bool on_off(char *arg, __s8 *attr, char *val)
 223 {
 224         if (strcmp(val, "on") == 0)
 225                 *attr = 1;
 226         else if (strcmp(val, "off") == 0)
 227                 *attr = 0;
 228         else {
 229                 fprintf(stderr,
 230                         "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
 231                         arg);
 232                 return false;
 233         }
 234
 235         return true;
 236 }
 237
 238 static int brlink_modify(int argc, char **argv)
 239 {
 240         struct {
 241                 struct nlmsghdr  n;
 242                 struct ifinfomsg ifm;
 243                 char             buf[512];
 244         } req;
 245         char *d = NULL;
 246         __s8 hairpin = -1;
 247         __s8 bpdu_guard = -1;
 248         __s8 fast_leave = -1;
 249         __s8 root_block = -1;
 250         __u32 cost = 0;
 251         __s16 priority = -1;
 252         __s8 state = -1;
 253         __s16 mode = -1;
 254         __u16 flags = BRIDGE_FLAGS_MASTER;
 255         struct rtattr *nest;
 256
 257         memset(&req, 0, sizeof(req));
 258
 259         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 260         req.n.nlmsg_flags = NLM_F_REQUEST;
 261         req.n.nlmsg_type = RTM_SETLINK;
 262         req.ifm.ifi_family = PF_BRIDGE;
 263
 264         while (argc > 0) {
 265                 if (strcmp(*argv, "dev") == 0) {
 266                         NEXT_ARG();
 267                         d = *argv;
 268                 } else if (strcmp(*argv, "guard") == 0) {
 269                         NEXT_ARG();
 270                         if (!on_off("guard", &bpdu_guard, *argv))
 271                                 exit(-1);
 272                 } else if (strcmp(*argv, "hairpin") == 0) {
 273                         NEXT_ARG();
 274                         if (!on_off("hairping", &hairpin, *argv))
 275                                 exit(-1);
 276                 } else if (strcmp(*argv, "fastleave") == 0) {
 277                         NEXT_ARG();
 278                         if (!on_off("fastleave", &fast_leave, *argv))
 279                                 exit(-1);
 280                 } else if (strcmp(*argv, "root_block") == 0) {
 281                         NEXT_ARG();
 282                         if (!on_off("root_block", &root_block, *argv))
 283                                 exit(-1);
 284                 } else if (strcmp(*argv, "cost")) {
 285                         NEXT_ARG();
 286                         cost = atoi(*argv);
 287                 } else if (strcmp(*argv, "priority")) {
 288                         NEXT_ARG();
 289                         priority = atoi(*argv);
 290                 } else if (strcmp(*argv, "state")) {
 291                         NEXT_ARG();
 292                         state = atoi(*argv);
 293                 } else if (strcmp(*argv, "hwmode")) {
 294                         NEXT_ARG();
 295                         flags |= BRIDGE_FLAGS_SELF;
 296                         if (strcmp(*argv, "vepa") == 0)
 297                                 mode = BRIDGE_MODE_VEPA;
 298                         else if (strcmp(*argv, "veb") == 0)
 299                                 mode = BRIDGE_MODE_VEB;
 300                         else {
 301                                 fprintf(stderr,
 302                                         "Mode argument must be \"vepa\" or "
 303                                         "\"veb\".\n");
 304                                 exit(-1);
 305                         }
 306                 } else {
 307                         usage();
 308                 }
 309                 argc--; argv++;
 310         }
 311         if (d == NULL) {
 312                 fprintf(stderr, "Device is a required argument.\n");
 313                 exit(-1);
 314         }
 315
 316
 317         req.ifm.ifi_index = ll_name_to_index(d);
 318         if (req.ifm.ifi_index == 0) {
 319                 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
 320                 exit(-1);
 321         }
 322
 323         /* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
 324          * state.
 325          */
 326         nest = addattr_nest(&req.n, sizeof(req),
 327                             IFLA_PROTINFO | NLA_F_NESTED);
 328         /* Flags first */
 329         if (bpdu_guard >= 0)
 330                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
 331         if (hairpin >= 0)
 332                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
 333         if (fast_leave >= 0)
 334                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
 335                          fast_leave);
 336         if (root_block >= 0)
 337                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
 338
 339         if (cost > 0)
 340                 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
 341
 342         if (priority >= 0)
 343                 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
 344
 345         if (state >= 0)
 346                 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
 347
 348         addattr_nest_end(&req.n, nest);
 349
 350         /* IFLA_AF_SPEC nested attribute.  Contains IFLA_BRIDGE_FLAGS that
 351          * designates master or self operation as well as 'vepa' or 'veb'
 352          * operation modes.  These are only valid in 'self' mode on some
 353          * devices so far.  Thus we only need to include the flags attribute
 354          * if we are setting the hw mode.
 355          */
 356         if (mode >= 0) {
 357                 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
 358
 359                 addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
 360
 361                 if (mode >= 0)
 362                         addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
 363
 364                 addattr_nest_end(&req.n, nest);
 365         }
 366
 367         if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
 368                 exit(2);
 369
 370         return 0;
 371 }
 372
 373 static int brlink_show(int argc, char **argv)
 374 {
 375         char *filter_dev = NULL;
 376
 377         while (argc > 0) {
 378                 if (strcmp(*argv, "dev") == 0) {
 379                         NEXT_ARG();
 380                         if (filter_dev)
 381                                 duparg("dev", *argv);
 382                         filter_dev = *argv;
 383                 }
 384                 argc--; argv++;
 385         }
 386
 387         if (filter_dev) {
 388                 if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
 389                         fprintf(stderr, "Cannot find device \"%s\"\n",
 390                                 filter_dev);
 391                         return -1;
 392                 }
 393         }
 394
 395         if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
 396                 perror("Cannon send dump request");
 397                 exit(1);
 398         }
 399
 400         if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
 401                 fprintf(stderr, "Dump terminated\n");
 402                 exit(1);
 403         }
 404         return 0;
 405 }
 406
 407 int do_link(int argc, char **argv)
 408 {
 409         ll_init_map(&rth);
 410         if (argc > 0) {
 411                 if (matches(*argv, "set") == 0 ||
 412                     matches(*argv, "change") == 0)
 413                         return brlink_modify(argc-1, argv+1);
 414                 if (matches(*argv, "show") == 0 ||
 415                     matches(*argv, "lst") == 0 ||
 416                     matches(*argv, "list") == 0)
 417                         return brlink_show(argc-1, argv+1);
 418                 if (matches(*argv, "help") == 0)
 419                         usage();
 420         } else
 421                 return brlink_show(0, NULL);
 422
 423         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
 424         exit(-1);
 425 }