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]\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 {
  53         SPRINT_BUF(abuf);
  54
  55         if (e->addr.proto == htons(ETH_P_IP))
  56                 fprintf(f, "dev %s port %s grp %s %s\n", ll_index_to_name(ifindex),
  57                         ll_index_to_name(e->ifindex),
  58                         inet_ntop(AF_INET, &e->addr.u.ip4, abuf, sizeof(abuf)),
  59                         (e->state & MDB_PERMANENT) ? "permanent" : "temp");
  60         else
  61                 fprintf(f, "dev %s port %s grp %s %s\n", ll_index_to_name(ifindex),
  62                         ll_index_to_name(e->ifindex),
  63                         inet_ntop(AF_INET6, &e->addr.u.ip6, abuf, sizeof(abuf)),
  64                         (e->state & MDB_PERMANENT) ? "permanent" : "temp");
  65 }
  66
  67 static void br_print_mdb_entry(FILE *f, int ifindex, struct rtattr *attr)
  68 {
  69         struct rtattr *i;
  70         int rem;
  71         struct br_mdb_entry *e;
  72
  73         rem = RTA_PAYLOAD(attr);
  74         for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
  75                 e = RTA_DATA(i);
  76                 print_mdb_entry(f, ifindex, e);
  77         }
  78 }
  79
  80 int print_mdb(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  81 {
  82         FILE *fp = arg;
  83         struct br_port_msg *r = NLMSG_DATA(n);
  84         int len = n->nlmsg_len;
  85         struct rtattr * tb[MDBA_MAX+1];
  86
  87         if (n->nlmsg_type != RTM_GETMDB && n->nlmsg_type != RTM_NEWMDB && n->nlmsg_type != RTM_DELMDB) {
  88                 fprintf(stderr, "Not RTM_GETMDB, RTM_NEWMDB or RTM_DELMDB: %08x %08x %08x\n",
  89                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  90
  91                 return 0;
  92         }
  93
  94         len -= NLMSG_LENGTH(sizeof(*r));
  95         if (len < 0) {
  96                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  97                 return -1;
  98         }
  99
 100         if (filter_index && filter_index != r->ifindex)
 101                 return 0;
 102
 103         parse_rtattr(tb, MDBA_MAX, MDBA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
 104
 105         if (tb[MDBA_MDB]) {
 106                 struct rtattr *i;
 107                 int rem = RTA_PAYLOAD(tb[MDBA_MDB]);
 108
 109                 for (i = RTA_DATA(tb[MDBA_MDB]); RTA_OK(i, rem); i = RTA_NEXT(i, rem))
 110                         br_print_mdb_entry(fp, r->ifindex, i);
 111         }
 112
 113         if (tb[MDBA_ROUTER]) {
 114                 if (show_details) {
 115                         fprintf(fp, "router ports on %s: ", ll_index_to_name(r->ifindex));
 116                         br_print_router_ports(fp, tb[MDBA_ROUTER]);
 117                 }
 118         }
 119
 120         return 0;
 121 }
 122
 123 static int mdb_show(int argc, char **argv)
 124 {
 125         char *filter_dev = NULL;
 126
 127         while (argc > 0) {
 128                 if (strcmp(*argv, "dev") == 0) {
 129                         NEXT_ARG();
 130                         if (filter_dev)
 131                                 duparg("dev", *argv);
 132                         filter_dev = *argv;
 133                 }
 134                 argc--; argv++;
 135         }
 136
 137         if (filter_dev) {
 138                 filter_index = if_nametoindex(filter_dev);
 139                 if (filter_index == 0) {
 140                         fprintf(stderr, "Cannot find device \"%s\"\n",
 141                                 filter_dev);
 142                         return -1;
 143                 }
 144         }
 145
 146         if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETMDB) < 0) {
 147                 perror("Cannot send dump request");
 148                 return -1;
 149         }
 150
 151         if (rtnl_dump_filter(&rth, print_mdb, stdout) < 0) {
 152                 fprintf(stderr, "Dump terminated\n");
 153                 return -1;
 154         }
 155
 156         return 0;
 157 }
 158
 159 static int mdb_modify(int cmd, int flags, int argc, char **argv)
 160 {
 161         struct {
 162                 struct nlmsghdr         n;
 163                 struct br_port_msg      bpm;
 164                 char                    buf[1024];
 165         } req;
 166         struct br_mdb_entry entry;
 167         char *d = NULL, *p = NULL, *grp = NULL;
 168
 169         memset(&req, 0, sizeof(req));
 170         memset(&entry, 0, sizeof(entry));
 171
 172         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct br_port_msg));
 173         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 174         req.n.nlmsg_type = cmd;
 175         req.bpm.family = PF_BRIDGE;
 176
 177         while (argc > 0) {
 178                 if (strcmp(*argv, "dev") == 0) {
 179                         NEXT_ARG();
 180                         d = *argv;
 181                 } else if (strcmp(*argv, "grp") == 0) {
 182                         NEXT_ARG();
 183                         grp = *argv;
 184                 } else if (strcmp(*argv, "port") == 0) {
 185                         NEXT_ARG();
 186                         p = *argv;
 187                 } else if (strcmp(*argv, "permanent") == 0) {
 188                         if (cmd == RTM_NEWMDB)
 189                                 entry.state |= MDB_PERMANENT;
 190                 } else if (strcmp(*argv, "temp") == 0) {
 191                         ;/* nothing */
 192                 } else {
 193                         if (matches(*argv, "help") == 0)
 194                                 usage();
 195                 }
 196                 argc--; argv++;
 197         }
 198
 199         if (d == NULL || grp == NULL || p == NULL) {
 200                 fprintf(stderr, "Device, group address and port name are required arguments.\n");
 201                 return -1;
 202         }
 203
 204         req.bpm.ifindex = ll_name_to_index(d);
 205         if (req.bpm.ifindex == 0) {
 206                 fprintf(stderr, "Cannot find device \"%s\"\n", d);
 207                 return -1;
 208         }
 209
 210         entry.ifindex = ll_name_to_index(p);
 211         if (entry.ifindex == 0) {
 212                 fprintf(stderr, "Cannot find device \"%s\"\n", p);
 213                 return -1;
 214         }
 215
 216         if (!inet_pton(AF_INET, grp, &entry.addr.u.ip4)) {
 217                 if (!inet_pton(AF_INET6, grp, &entry.addr.u.ip6)) {
 218                         fprintf(stderr, "Invalid address \"%s\"\n", grp);
 219                         return -1;
 220                 } else
 221                         entry.addr.proto = htons(ETH_P_IPV6);
 222         } else
 223                 entry.addr.proto = htons(ETH_P_IP);
 224
 225         addattr_l(&req.n, sizeof(req), MDBA_SET_ENTRY, &entry, sizeof(entry));
 226
 227         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 228                 return -1;
 229
 230         return 0;
 231 }
 232
 233 int do_mdb(int argc, char **argv)
 234 {
 235         ll_init_map(&rth);
 236
 237         if (argc > 0) {
 238                 if (matches(*argv, "add") == 0)
 239                         return mdb_modify(RTM_NEWMDB, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
 240                 if (matches(*argv, "delete") == 0)
 241                         return mdb_modify(RTM_DELMDB, 0, argc-1, argv+1);
 242
 243                 if (matches(*argv, "show") == 0 ||
 244                     matches(*argv, "lst") == 0 ||
 245                     matches(*argv, "list") == 0)
 246                         return mdb_show(argc-1, argv+1);
 247                 if (matches(*argv, "help") == 0)
 248                         usage();
 249         } else
 250                 return mdb_show(0, NULL);
 251
 252         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge mdb help\".\n", *argv);
 253         exit(-1);
 254 }