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         int tb;
  49         int af;
  50         int iif;
  51         inet_prefix mdst;
  52         inet_prefix msrc;
  53 } filter;
  54
  55 int print_mroute(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  56 {
  57         FILE *fp = (FILE *)arg;
  58         struct rtmsg *r = NLMSG_DATA(n);
  59         int len = n->nlmsg_len;
  60         struct rtattr *tb[RTA_MAX+1];
  61         char obuf[256];
  62
  63         SPRINT_BUF(b1);
  64         __u32 table;
  65         int iif = 0;
  66         int family;
  67
  68         if ((n->nlmsg_type != RTM_NEWROUTE &&
  69              n->nlmsg_type != RTM_DELROUTE)) {
  70                 fprintf(stderr, "Not a multicast route: %08x %08x %08x\n",
  71                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  72                 return 0;
  73         }
  74         len -= NLMSG_LENGTH(sizeof(*r));
  75         if (len < 0) {
  76                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  77                 return -1;
  78         }
  79         if (r->rtm_type != RTN_MULTICAST) {
  80                 fprintf(stderr, "Not a multicast route (type: %s)\n",
  81                         rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
  82                 return 0;
  83         }
  84
  85         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
  86         table = rtm_get_table(r, tb);
  87
  88         if (filter.tb > 0 && filter.tb != table)
  89                 return 0;
  90
  91         if (tb[RTA_IIF])
  92                 iif = rta_getattr_u32(tb[RTA_IIF]);
  93         if (filter.iif && filter.iif != iif)
  94                 return 0;
  95
  96         if (filter.af && filter.af != r->rtm_family)
  97                 return 0;
  98
  99         if (tb[RTA_DST] && filter.mdst.bitlen > 0) {
 100                 inet_prefix dst = { .family = r->rtm_family };
 101
 102                 memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), RTA_PAYLOAD(tb[RTA_DST]));
 103                 if (inet_addr_match(&dst, &filter.mdst, filter.mdst.bitlen))
 104                         return 0;
 105         }
 106
 107         if (tb[RTA_SRC] && filter.msrc.bitlen > 0) {
 108                 inet_prefix src = { .family = r->rtm_family };
 109
 110                 memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), RTA_PAYLOAD(tb[RTA_SRC]));
 111                 if (inet_addr_match(&src, &filter.msrc, filter.msrc.bitlen))
 112                         return 0;
 113         }
 114
 115         family = get_real_family(r->rtm_type, r->rtm_family);
 116
 117         if (n->nlmsg_type == RTM_DELROUTE)
 118                 fprintf(fp, "Deleted ");
 119
 120         if (tb[RTA_SRC])
 121                 len = snprintf(obuf, sizeof(obuf),
 122                                "(%s, ", rt_addr_n2a_rta(family, tb[RTA_SRC]));
 123         else
 124                 len = sprintf(obuf, "(unknown, ");
 125         if (tb[RTA_DST])
 126                 snprintf(obuf + len, sizeof(obuf) - len,
 127                          "%s)", rt_addr_n2a_rta(family, tb[RTA_DST]));
 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         fprintf(fp, " State: %s",
 163                 r->rtm_flags & RTNH_F_UNRESOLVED ? "unresolved" : "resolved");
 164         if (show_stats && tb[RTA_MFC_STATS]) {
 165                 struct rta_mfc_stats *mfcs = RTA_DATA(tb[RTA_MFC_STATS]);
 166
 167                 fprintf(fp, "%s  %"PRIu64" packets, %"PRIu64" bytes", _SL_,
 168                         (uint64_t)mfcs->mfcs_packets,
 169                         (uint64_t)mfcs->mfcs_bytes);
 170                 if (mfcs->mfcs_wrong_if)
 171                         fprintf(fp, ", %"PRIu64" arrived on wrong iif.",
 172                                 (uint64_t)mfcs->mfcs_wrong_if);
 173         }
 174         if (show_stats && tb[RTA_EXPIRES]) {
 175                 struct timeval tv;
 176
 177                 __jiffies_to_tv(&tv, rta_getattr_u64(tb[RTA_EXPIRES]));
 178                 fprintf(fp, ", Age %4i.%.2i", (int)tv.tv_sec,
 179                         (int)tv.tv_usec/10000);
 180         }
 181         fprintf(fp, "\n");
 182         fflush(fp);
 183         return 0;
 184 }
 185
 186 void ipmroute_reset_filter(int ifindex)
 187 {
 188         memset(&filter, 0, sizeof(filter));
 189         filter.mdst.bitlen = -1;
 190         filter.msrc.bitlen = -1;
 191         filter.iif = ifindex;
 192 }
 193
 194 static int mroute_list(int argc, char **argv)
 195 {
 196         char *id = NULL;
 197         int family;
 198
 199         ipmroute_reset_filter(0);
 200         if (preferred_family == AF_UNSPEC)
 201                 family = AF_INET;
 202         else
 203                 family = AF_INET6;
 204         if (family == AF_INET) {
 205                 filter.af = RTNL_FAMILY_IPMR;
 206                 filter.tb = RT_TABLE_DEFAULT;  /* for backward compatibility */
 207         } else
 208                 filter.af = RTNL_FAMILY_IP6MR;
 209
 210         while (argc > 0) {
 211                 if (matches(*argv, "table") == 0) {
 212                         __u32 tid;
 213
 214                         NEXT_ARG();
 215                         if (rtnl_rttable_a2n(&tid, *argv)) {
 216                                 if (strcmp(*argv, "all") == 0) {
 217                                         filter.tb = 0;
 218                                 } else if (strcmp(*argv, "help") == 0) {
 219                                         usage();
 220                                 } else {
 221                                         invarg("table id value is invalid\n", *argv);
 222                                 }
 223                         } else
 224                                 filter.tb = tid;
 225                 } else if (strcmp(*argv, "iif") == 0) {
 226                         NEXT_ARG();
 227                         id = *argv;
 228                 } else if (matches(*argv, "from") == 0) {
 229                         NEXT_ARG();
 230                         get_prefix(&filter.msrc, *argv, family);
 231                 } else {
 232                         if (strcmp(*argv, "to") == 0) {
 233                                 NEXT_ARG();
 234                         }
 235                         if (matches(*argv, "help") == 0)
 236                                 usage();
 237                         get_prefix(&filter.mdst, *argv, family);
 238                 }
 239                 argc--; argv++;
 240         }
 241
 242         ll_init_map(&rth);
 243
 244         if (id)  {
 245                 int idx;
 246
 247                 if ((idx = ll_name_to_index(id)) == 0) {
 248                         fprintf(stderr, "Cannot find device \"%s\"\n", id);
 249                         return -1;
 250                 }
 251                 filter.iif = idx;
 252         }
 253
 254         if (rtnl_wilddump_request(&rth, filter.af, RTM_GETROUTE) < 0) {
 255                 perror("Cannot send dump request");
 256                 return 1;
 257         }
 258
 259         if (rtnl_dump_filter(&rth, print_mroute, stdout) < 0) {
 260                 fprintf(stderr, "Dump terminated\n");
 261                 exit(1);
 262         }
 263
 264         exit(0);
 265 }
 266
 267 int do_multiroute(int argc, char **argv)
 268 {
 269         if (argc < 1)
 270                 return mroute_list(0, NULL);
 271 #if 0
 272         if (matches(*argv, "add") == 0)
 273                 return mroute_modify(RTM_NEWADDR, argc-1, argv+1);
 274         if (matches(*argv, "delete") == 0)
 275                 return mroute_modify(RTM_DELADDR, argc-1, argv+1);
 276         if (matches(*argv, "get") == 0)
 277                 return mroute_get(argc-1, argv+1);
 278 #endif
 279         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 280             || matches(*argv, "lst") == 0)
 281                 return mroute_list(argc-1, argv+1);
 282         if (matches(*argv, "help") == 0)
 283                 usage();
 284         fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
 285         exit(-1);
 286 }