bridge/mdb.c

   1 /*
   2  * Get mdb table with netlink
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include <fcntl.h>
   9 #include <sys/socket.h>
  10 #include <net/if.h>
  11 #include <netinet/in.h>
  12 #include <linux/if_bridge.h>
  13 #include <linux/if_ether.h>
  14 #include <string.h>
  15 #include <arpa/inet.h>
  16
  17 #include "libnetlink.h"
  18 #include "br_common.h"
  19 #include "rt_names.h"
  20 #include "utils.h"
  21
  22 #ifndef MDBA_RTA
  23 #define MDBA_RTA(r) \
  24         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct br_port_msg))))
  25 #endif
  26
  27 static unsigned int filter_index;
  28
  29 static void usage(void)
  30 {
  31         fprintf(stderr, "Usage: bridge mdb { add | del } dev DEV port PORT grp GROUP [permanent | temp] [vid VID]\n");
  32         fprintf(stderr, "       bridge mdb {show} [ dev DEV ]\n");
  33         exit(-1);
  34 }
  35
  36 static void br_print_router_ports(FILE *f, struct rtattr *attr)
  37 {
  38         uint32_t *port_ifindex;
  39         struct rtattr *i;
  40         int rem;
  41
  42         rem = RTA_PAYLOAD(attr);
  43         for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
  44                 port_ifindex = RTA_DATA(i);
  45                 fprintf(f, "%s ", ll_index_to_name(*port_ifindex));
  46         }
  47
  48         fprintf(f, "\n");
  49 }
  50
  51 static void print_mdb_entry(FILE *f, int ifindex, struct br_mdb_entry *e,
  52                             struct nlmsghdr *n, struct rtattr **tb)
  53 {
  54         SPRINT_BUF(abuf);
  55         const void *src;
  56         int af;
  57
  58         af = e->addr.proto == htons(ETH_P_IP) ? AF_INET : AF_INET6;
  59         src = af == AF_INET ? (const void *)&e->addr.u.ip4 :
  60                               (const void *)&e->addr.u.ip6;
  61         if (n->nlmsg_type == RTM_DELMDB)
  62                 fprintf(f, "Deleted ");
  63         fprintf(f, "dev %s port %s grp %s %s %s", ll_index_to_name(ifindex),
  64                 ll_index_to_name(e->ifindex),
  65                 inet_ntop(af, src, abuf, sizeof(abuf)),
  66                 (e->state & MDB_PERMANENT) ? "permanent" : "temp",
  67                 (e->flags & MDB_FLAGS_OFFLOAD) ? "offload" : "");
  68         if (e->vid)
  69                 fprintf(f, " vid %hu", e->vid);
  70         if (show_stats && tb && tb[MDBA_MDB_EATTR_TIMER]) {
  71                 struct timeval tv;
  72
  73                 __jiffies_to_tv(&tv, rta_getattr_u32(tb[MDBA_MDB_EATTR_TIMER]));
  74                 fprintf(f, "%4i.%.2i", (int)tv.tv_sec, (int)tv.tv_usec/10000);
  75         }
  76         fprintf(f, "\n");
  77 }
  78
  79 static void br_print_mdb_entry(FILE *f, int ifindex, struct rtattr *attr,
  80                                struct nlmsghdr *n)
  81 {
  82         struct rtattr *etb[MDBA_MDB_EATTR_MAX + 1];
  83         struct br_mdb_entry *e;
  84         struct rtattr *i;
  85         int rem;
  86
  87         rem = RTA_PAYLOAD(attr);
  88         for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
  89                 e = RTA_DATA(i);
  90                 parse_rtattr(etb, MDBA_MDB_EATTR_MAX, MDB_RTA(RTA_DATA(i)),
  91                              RTA_PAYLOAD(i) - RTA_ALIGN(sizeof(*e)));
  92                 print_mdb_entry(f, ifindex, e, n, etb);
  93         }
  94 }
  95
  96 int print_mdb(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  97 {
  98         FILE *fp = arg;
  99         struct br_port_msg *r = NLMSG_DATA(n);
 100         int len = n->nlmsg_len;
 101         struct rtattr *tb[MDBA_MAX+1], *i;
 102
 103         if (n->nlmsg_type != RTM_GETMDB && n->nlmsg_type != RTM_NEWMDB && n->nlmsg_type != RTM_DELMDB) {
 104                 fprintf(stderr, "Not RTM_GETMDB, RTM_NEWMDB or RTM_DELMDB: %08x %08x %08x\n",
 105                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 106
 107                 return 0;
 108         }
 109
 110         len -= NLMSG_LENGTH(sizeof(*r));
 111         if (len < 0) {
 112                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 113                 return -1;
 114         }
 115
 116         if (filter_index && filter_index != r->ifindex)
 117                 return 0;
 118
 119         parse_rtattr(tb, MDBA_MAX, MDBA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
 120
 121         if (tb[MDBA_MDB]) {
 122                 int rem = RTA_PAYLOAD(tb[MDBA_MDB]);
 123
 124                 for (i = RTA_DATA(tb[MDBA_MDB]); RTA_OK(i, rem); i = RTA_NEXT(i, rem))
 125                         br_print_mdb_entry(fp, r->ifindex, i, n);
 126         }
 127
 128         if (tb[MDBA_ROUTER]) {
 129                 if (n->nlmsg_type == RTM_GETMDB) {
 130                         if (show_details) {
 131                                 fprintf(fp, "router ports on %s: ",
 132                                         ll_index_to_name(r->ifindex));
 133                                 br_print_router_ports(fp, tb[MDBA_ROUTER]);
 134                         }
 135                 } else {
 136                         uint32_t *port_ifindex;
 137
 138                         i = RTA_DATA(tb[MDBA_ROUTER]);
 139                         port_ifindex = RTA_DATA(i);
 140                         if (n->nlmsg_type == RTM_DELMDB)
 141                                 fprintf(fp, "Deleted ");
 142                         fprintf(fp, "router port dev %s master %s\n",
 143                                 ll_index_to_name(*port_ifindex),
 144                                 ll_index_to_name(r->ifindex));
 145                 }
 146         }
 147
 148         fflush(fp);
 149
 150         return 0;
 151 }
 152
 153 static int mdb_show(int argc, char **argv)
 154 {
 155         char *filter_dev = NULL;
 156
 157         while (argc > 0) {
 158                 if (strcmp(*argv, "dev") == 0) {
 159                         NEXT_ARG();
 160                         if (filter_dev)
 161                                 duparg("dev", *argv);
 162                         filter_dev = *argv;
 163                 }
 164                 argc--; argv++;
 165         }
 166
 167         if (filter_dev) {
 168                 filter_index = if_nametoindex(filter_dev);
 169                 if (filter_index == 0) {
 170                         fprintf(stderr, "Cannot find device \"%s\"\n",
 171                                 filter_dev);
 172                         return -1;
 173                 }
 174         }
 175
 176         if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETMDB) < 0) {
 177                 perror("Cannot send dump request");
 178                 return -1;
 179         }
 180
 181         if (rtnl_dump_filter(&rth, print_mdb, stdout) < 0) {
 182                 fprintf(stderr, "Dump terminated\n");
 183                 return -1;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int mdb_modify(int cmd, int flags, int argc, char **argv)
 190 {
 191         struct {
 192                 struct nlmsghdr         n;
 193                 struct br_port_msg      bpm;
 194                 char                    buf[1024];
 195         } req;
 196         struct br_mdb_entry entry;
 197         char *d = NULL, *p = NULL, *grp = NULL;
 198         short vid = 0;
 199
 200         memset(&req, 0, sizeof(req));
 201         memset(&entry, 0, sizeof(entry));
 202
 203         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct br_port_msg));
 204         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 205         req.n.nlmsg_type = cmd;
 206         req.bpm.family = PF_BRIDGE;
 207
 208         while (argc > 0) {
 209                 if (strcmp(*argv, "dev") == 0) {
 210                         NEXT_ARG();
 211                         d = *argv;
 212                 } else if (strcmp(*argv, "grp") == 0) {
 213                         NEXT_ARG();
 214                         grp = *argv;
 215                 } else if (strcmp(*argv, "port") == 0) {
 216                         NEXT_ARG();
 217                         p = *argv;
 218                 } else if (strcmp(*argv, "permanent") == 0) {
 219                         if (cmd == RTM_NEWMDB)
 220                                 entry.state |= MDB_PERMANENT;
 221                 } else if (strcmp(*argv, "temp") == 0) {
 222                         ;/* nothing */
 223                 } else if (strcmp(*argv, "vid") == 0) {
 224                         NEXT_ARG();
 225                         vid = atoi(*argv);
 226                 } else {
 227                         if (matches(*argv, "help") == 0)
 228                                 usage();
 229                 }
 230                 argc--; argv++;
 231         }
 232
 233         if (d == NULL || grp == NULL || p == NULL) {
 234                 fprintf(stderr, "Device, group address and port name are required arguments.\n");
 235                 return -1;
 236         }
 237
 238         req.bpm.ifindex = ll_name_to_index(d);
 239         if (req.bpm.ifindex == 0) {
 240                 fprintf(stderr, "Cannot find device \"%s\"\n", d);
 241                 return -1;
 242         }
 243
 244         entry.ifindex = ll_name_to_index(p);
 245         if (entry.ifindex == 0) {
 246                 fprintf(stderr, "Cannot find device \"%s\"\n", p);
 247                 return -1;
 248         }
 249
 250         if (!inet_pton(AF_INET, grp, &entry.addr.u.ip4)) {
 251                 if (!inet_pton(AF_INET6, grp, &entry.addr.u.ip6)) {
 252                         fprintf(stderr, "Invalid address \"%s\"\n", grp);
 253                         return -1;
 254                 } else
 255                         entry.addr.proto = htons(ETH_P_IPV6);
 256         } else
 257                 entry.addr.proto = htons(ETH_P_IP);
 258
 259         entry.vid = vid;
 260         addattr_l(&req.n, sizeof(req), MDBA_SET_ENTRY, &entry, sizeof(entry));
 261
 262         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 263                 return -1;
 264
 265         return 0;
 266 }
 267
 268 int do_mdb(int argc, char **argv)
 269 {
 270         ll_init_map(&rth);
 271
 272         if (argc > 0) {
 273                 if (matches(*argv, "add") == 0)
 274                         return mdb_modify(RTM_NEWMDB, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
 275                 if (matches(*argv, "delete") == 0)
 276                         return mdb_modify(RTM_DELMDB, 0, argc-1, argv+1);
 277
 278                 if (matches(*argv, "show") == 0 ||
 279                     matches(*argv, "lst") == 0 ||
 280                     matches(*argv, "list") == 0)
 281                         return mdb_show(argc-1, argv+1);
 282                 if (matches(*argv, "help") == 0)
 283                         usage();
 284         } else
 285                 return mdb_show(0, NULL);
 286
 287         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge mdb help\".\n", *argv);
 288         exit(-1);
 289 }