ip/ipmroute.c

   1 /*
   2  * ipmroute.c           "ip mroute".
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <inttypes.h>
  19 #include <sys/ioctl.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <arpa/inet.h>
  23 #include <string.h>
  24
  25 #include <linux/netdevice.h>
  26 #include <linux/if.h>
  27 #include <linux/if_arp.h>
  28 #include <linux/sockios.h>
  29
  30 #include <rt_names.h>
  31 #include "utils.h"
  32 #include "ip_common.h"
  33
  34 static void usage(void) __attribute__((noreturn));
  35
  36 static void usage(void)
  37 {
  38         fprintf(stderr, "Usage: ip mroute show [ [ to ] PREFIX ] [ from PREFIX ] [ iif DEVICE ]\n");
  39         fprintf(stderr, "                      [ table TABLE_ID ]\n");
  40         fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
  41 #if 0
  42         fprintf(stderr, "Usage: ip mroute [ add | del ] DESTINATION from SOURCE [ iif DEVICE ] [ oif DEVICE ]\n");
  43 #endif
  44         exit(-1);
  45 }
  46
  47 struct rtfilter
  48 {
  49         int tb;
  50         int af;
  51         int iif;
  52         inet_prefix mdst;
  53         inet_prefix msrc;
  54 } filter;
  55
  56 int print_mroute(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  57 {
  58         FILE *fp = (FILE*)arg;
  59         struct rtmsg *r = NLMSG_DATA(n);
  60         int len = n->nlmsg_len;
  61         struct rtattr * tb[RTA_MAX+1];
  62         char abuf[256];
  63         char obuf[256];
  64         SPRINT_BUF(b1);
  65         __u32 table;
  66         int iif = 0;
  67         int family;
  68
  69         if ((n->nlmsg_type != RTM_NEWROUTE &&
  70              n->nlmsg_type != RTM_DELROUTE) ||
  71             !(n->nlmsg_flags & NLM_F_MULTI)) {
  72                 fprintf(stderr, "Not a multicast route: %08x %08x %08x\n",
  73                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  74                 return 0;
  75         }
  76         len -= NLMSG_LENGTH(sizeof(*r));
  77         if (len < 0) {
  78                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  79                 return -1;
  80         }
  81         if (r->rtm_type != RTN_MULTICAST) {
  82                 fprintf(stderr, "Not a multicast route (type: %s)\n",
  83                         rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
  84                 return 0;
  85         }
  86
  87         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
  88         table = rtm_get_table(r, tb);
  89
  90         if (filter.tb > 0 && filter.tb != table)
  91                 return 0;
  92
  93         if (tb[RTA_IIF])
  94                 iif = *(int*)RTA_DATA(tb[RTA_IIF]);
  95         if (filter.iif && filter.iif != iif)
  96                 return 0;
  97
  98         if (filter.af && filter.af != r->rtm_family)
  99                 return 0;
 100
 101         if (tb[RTA_DST] &&
 102             filter.mdst.bitlen > 0 &&
 103             inet_addr_match(RTA_DATA(tb[RTA_DST]), &filter.mdst, filter.mdst.bitlen))
 104                 return 0;
 105
 106         if (tb[RTA_SRC] &&
 107             filter.msrc.bitlen > 0 &&
 108             inet_addr_match(RTA_DATA(tb[RTA_SRC]), &filter.msrc, filter.msrc.bitlen))
 109                 return 0;
 110
 111         family = r->rtm_family == RTNL_FAMILY_IPMR ? AF_INET : AF_INET6;
 112
 113         if (n->nlmsg_type == RTM_DELROUTE)
 114                 fprintf(fp, "Deleted ");
 115
 116         if (tb[RTA_SRC])
 117                 len = snprintf(obuf, sizeof(obuf),
 118                                "(%s, ", rt_addr_n2a(family,
 119                                                     RTA_DATA(tb[RTA_SRC]),
 120                                                     abuf, sizeof(abuf)));
 121         else
 122                 len = sprintf(obuf, "(unknown, ");
 123         if (tb[RTA_DST])
 124                 snprintf(obuf + len, sizeof(obuf) - len,
 125                          "%s)", rt_addr_n2a(family,
 126                                             RTA_DATA(tb[RTA_DST]),
 127                                             abuf, sizeof(abuf)));
 128         else
 129                 snprintf(obuf + len, sizeof(obuf) - len, "unknown) ");
 130
 131         fprintf(fp, "%-32s Iif: ", obuf);
 132         if (iif)
 133                 fprintf(fp, "%-10s ", ll_index_to_name(iif));
 134         else
 135                 fprintf(fp, "unresolved ");
 136
 137         if (tb[RTA_MULTIPATH]) {
 138                 struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
 139                 int first = 1;
 140
 141                 len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
 142
 143                 for (;;) {
 144                         if (len < sizeof(*nh))
 145                                 break;
 146                         if (nh->rtnh_len > len)
 147                                 break;
 148
 149                         if (first) {
 150                                 fprintf(fp, "Oifs: ");
 151                                 first = 0;
 152                         }
 153                         fprintf(fp, "%s", ll_index_to_name(nh->rtnh_ifindex));
 154                         if (nh->rtnh_hops > 1)
 155                                 fprintf(fp, "(ttl %d) ", nh->rtnh_hops);
 156                         else
 157                                 fprintf(fp, " ");
 158                         len -= NLMSG_ALIGN(nh->rtnh_len);
 159                         nh = RTNH_NEXT(nh);
 160                 }
 161         }
 162         if (show_stats && tb[RTA_MFC_STATS]) {
 163                 struct rta_mfc_stats *mfcs = RTA_DATA(tb[RTA_MFC_STATS]);
 164
 165                 fprintf(fp, "%s  %"PRIu64" packets, %"PRIu64" bytes", _SL_,
 166                         (uint64_t)mfcs->mfcs_packets,
 167                         (uint64_t)mfcs->mfcs_bytes);
 168                 if (mfcs->mfcs_wrong_if)
 169                         fprintf(fp, ", %"PRIu64" arrived on wrong iif.",
 170                                 (uint64_t)mfcs->mfcs_wrong_if);
 171         }
 172         fprintf(fp, "\n");
 173         fflush(fp);
 174         return 0;
 175 }
 176
 177 void ipmroute_reset_filter(int ifindex)
 178 {
 179         memset(&filter, 0, sizeof(filter));
 180         filter.mdst.bitlen = -1;
 181         filter.msrc.bitlen = -1;
 182         filter.iif = ifindex;
 183 }
 184
 185 static int mroute_list(int argc, char **argv)
 186 {
 187         char *id = NULL;
 188         int family;
 189
 190         ipmroute_reset_filter(0);
 191         if (preferred_family == AF_UNSPEC)
 192                 family = AF_INET;
 193         else
 194                 family = AF_INET6;
 195         if (family == AF_INET) {
 196                 filter.af = RTNL_FAMILY_IPMR;
 197                 filter.tb = RT_TABLE_DEFAULT;  /* for backward compatibility */
 198         } else
 199                 filter.af = RTNL_FAMILY_IP6MR;
 200
 201         while (argc > 0) {
 202                 if (matches(*argv, "table") == 0) {
 203                         __u32 tid;
 204                         NEXT_ARG();
 205                         if (rtnl_rttable_a2n(&tid, *argv)) {
 206                                 if (strcmp(*argv, "all") == 0) {
 207                                         filter.tb = 0;
 208                                 } else if (strcmp(*argv, "help") == 0) {
 209                                         usage();
 210                                 } else {
 211                                         invarg("table id value is invalid\n", *argv);
 212                                 }
 213                         } else
 214                                 filter.tb = tid;
 215                 } else if (strcmp(*argv, "iif") == 0) {
 216                         NEXT_ARG();
 217                         id = *argv;
 218                 } else if (matches(*argv, "from") == 0) {
 219                         NEXT_ARG();
 220                         get_prefix(&filter.msrc, *argv, family);
 221                 } else {
 222                         if (strcmp(*argv, "to") == 0) {
 223                                 NEXT_ARG();
 224                         }
 225                         if (matches(*argv, "help") == 0)
 226                                 usage();
 227                         get_prefix(&filter.mdst, *argv, family);
 228                 }
 229                 argc--; argv++;
 230         }
 231
 232         ll_init_map(&rth);
 233
 234         if (id)  {
 235                 int idx;
 236
 237                 if ((idx = ll_name_to_index(id)) == 0) {
 238                         fprintf(stderr, "Cannot find device \"%s\"\n", id);
 239                         return -1;
 240                 }
 241                 filter.iif = idx;
 242         }
 243
 244         if (rtnl_wilddump_request(&rth, filter.af, RTM_GETROUTE) < 0) {
 245                 perror("Cannot send dump request");
 246                 return 1;
 247         }
 248
 249         if (rtnl_dump_filter(&rth, print_mroute, stdout) < 0) {
 250                 fprintf(stderr, "Dump terminated\n");
 251                 exit(1);
 252         }
 253
 254         exit(0);
 255 }
 256
 257 int do_multiroute(int argc, char **argv)
 258 {
 259         if (argc < 1)
 260                 return mroute_list(0, NULL);
 261 #if 0
 262         if (matches(*argv, "add") == 0)
 263                 return mroute_modify(RTM_NEWADDR, argc-1, argv+1);
 264         if (matches(*argv, "delete") == 0)
 265                 return mroute_modify(RTM_DELADDR, argc-1, argv+1);
 266         if (matches(*argv, "get") == 0)
 267                 return mroute_get(argc-1, argv+1);
 268 #endif
 269         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 270             || matches(*argv, "lst") == 0)
 271                 return mroute_list(argc-1, argv+1);
 272         if (matches(*argv, "help") == 0)
 273                 usage();
 274         fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
 275         exit(-1);
 276 }