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 <fcntl.h>
  17 #include <inttypes.h>
  18 #include <sys/ioctl.h>
  19 #include <sys/socket.h>
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #include <string.h>
  23
  24 #include <linux/netdevice.h>
  25 #include <linux/if.h>
  26 #include <linux/if_arp.h>
  27 #include <linux/sockios.h>
  28
  29 #include <rt_names.h>
  30 #include "utils.h"
  31 #include "ip_common.h"
  32 #include "json_print.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(struct nlmsghdr *n, void *arg)
  56 {
  57         struct rtmsg *r = NLMSG_DATA(n);
  58         int len = n->nlmsg_len;
  59         struct rtattr *tb[RTA_MAX+1];
  60         const char *src, *dst;
  61         SPRINT_BUF(b1);
  62         SPRINT_BUF(b2);
  63         __u32 table;
  64         int iif = 0;
  65         int family;
  66
  67         if ((n->nlmsg_type != RTM_NEWROUTE &&
  68              n->nlmsg_type != RTM_DELROUTE)) {
  69                 fprintf(stderr, "Not a multicast route: %08x %08x %08x\n",
  70                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  71                 return 0;
  72         }
  73         len -= NLMSG_LENGTH(sizeof(*r));
  74         if (len < 0) {
  75                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  76                 return -1;
  77         }
  78
  79         if (r->rtm_type != RTN_MULTICAST) {
  80                 fprintf(stderr,
  81                         "Non multicast route received, kernel does support IP multicast?\n");
  82                 return -1;
  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 (inet_addr_match_rta(&filter.mdst, tb[RTA_DST]))
 100                 return 0;
 101
 102         if (inet_addr_match_rta(&filter.msrc, tb[RTA_SRC]))
 103                 return 0;
 104
 105         family = get_real_family(r->rtm_type, r->rtm_family);
 106
 107         open_json_object(NULL);
 108         if (n->nlmsg_type == RTM_DELROUTE)
 109                 print_bool(PRINT_ANY, "deleted", "Deleted ", true);
 110
 111         if (tb[RTA_SRC])
 112                 src = rt_addr_n2a_r(family, RTA_PAYLOAD(tb[RTA_SRC]),
 113                                     RTA_DATA(tb[RTA_SRC]), b1, sizeof(b1));
 114         else
 115                 src = "unknown";
 116
 117         if (tb[RTA_DST])
 118                 dst = rt_addr_n2a_r(family, RTA_PAYLOAD(tb[RTA_DST]),
 119                                     RTA_DATA(tb[RTA_DST]), b2, sizeof(b2));
 120         else
 121                 dst = "unknown";
 122
 123         if (is_json_context()) {
 124                 print_string(PRINT_JSON, "src", NULL, src);
 125                 print_string(PRINT_JSON, "dst", NULL, dst);
 126         } else {
 127                 char obuf[256];
 128
 129                 snprintf(obuf, sizeof(obuf), "(%s,%s)", src, dst);
 130                 print_string(PRINT_FP, NULL,
 131                              "%-32s Iif: ", obuf);
 132         }
 133
 134         if (iif)
 135                 print_color_string(PRINT_ANY, COLOR_IFNAME,
 136                                    "iif", "%-10s ", ll_index_to_name(iif));
 137         else
 138                 print_string(PRINT_ANY,"iif", "%s ", "unresolved");
 139
 140         if (tb[RTA_MULTIPATH]) {
 141                 struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
 142                 int first = 1;
 143
 144                 open_json_array(PRINT_JSON, "multipath");
 145                 len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
 146
 147                 for (;;) {
 148                         if (len < sizeof(*nh))
 149                                 break;
 150                         if (nh->rtnh_len > len)
 151                                 break;
 152
 153                         open_json_object(NULL);
 154                         if (first) {
 155                                 print_string(PRINT_FP, NULL, "Oifs: ", NULL);
 156                                 first = 0;
 157                         }
 158
 159                         print_color_string(PRINT_ANY, COLOR_IFNAME,
 160                                            "oif", "%s", ll_index_to_name(nh->rtnh_ifindex));
 161
 162                         if (nh->rtnh_hops > 1)
 163                                 print_uint(PRINT_ANY,
 164                                            "ttl", "(ttl %u) ", nh->rtnh_hops);
 165                         else
 166                                 print_string(PRINT_FP, NULL, " ", NULL);
 167
 168                         close_json_object();
 169                         len -= NLMSG_ALIGN(nh->rtnh_len);
 170                         nh = RTNH_NEXT(nh);
 171                 }
 172                 close_json_array(PRINT_JSON, NULL);
 173         }
 174
 175         print_string(PRINT_ANY, "state", " State: %s",
 176                      (r->rtm_flags & RTNH_F_UNRESOLVED) ? "unresolved" : "resolved");
 177
 178         if (r->rtm_flags & RTNH_F_OFFLOAD)
 179                 print_null(PRINT_ANY, "offload", " offload", NULL);
 180
 181         if (show_stats && tb[RTA_MFC_STATS]) {
 182                 struct rta_mfc_stats *mfcs = RTA_DATA(tb[RTA_MFC_STATS]);
 183
 184                 print_nl();
 185                 print_u64(PRINT_ANY, "packets", "  %"PRIu64" packets,",
 186                            mfcs->mfcs_packets);
 187                 print_u64(PRINT_ANY, "bytes", " %"PRIu64" bytes", mfcs->mfcs_bytes);
 188
 189                 if (mfcs->mfcs_wrong_if)
 190                         print_u64(PRINT_ANY, "wrong_if",
 191                                    ", %"PRIu64" arrived on wrong iif.",
 192                                    mfcs->mfcs_wrong_if);
 193         }
 194
 195         if (show_stats && tb[RTA_EXPIRES]) {
 196                 struct timeval tv;
 197                 double age;
 198
 199                 __jiffies_to_tv(&tv, rta_getattr_u64(tb[RTA_EXPIRES]));
 200                 age = tv.tv_sec;
 201                 age += tv.tv_usec / 1000000.;
 202                 print_float(PRINT_ANY, "expires",
 203                             ", Age %.2f", age);
 204         }
 205
 206         if (table && (table != RT_TABLE_MAIN || show_details > 0) && !filter.tb)
 207                 print_string(PRINT_ANY, "table", " Table: %s",
 208                              rtnl_rttable_n2a(table, b1, sizeof(b1)));
 209
 210         print_string(PRINT_FP, NULL, "\n", NULL);
 211         close_json_object();
 212         return 0;
 213 }
 214
 215 void ipmroute_reset_filter(int ifindex)
 216 {
 217         memset(&filter, 0, sizeof(filter));
 218         filter.mdst.bitlen = -1;
 219         filter.msrc.bitlen = -1;
 220         filter.iif = ifindex;
 221 }
 222
 223 static int mroute_list(int argc, char **argv)
 224 {
 225         char *id = NULL;
 226         int family;
 227
 228         ipmroute_reset_filter(0);
 229         if (preferred_family == AF_UNSPEC)
 230                 family = AF_INET;
 231         else
 232                 family = AF_INET6;
 233         if (family == AF_INET) {
 234                 filter.af = RTNL_FAMILY_IPMR;
 235                 filter.tb = RT_TABLE_DEFAULT;  /* for backward compatibility */
 236         } else
 237                 filter.af = RTNL_FAMILY_IP6MR;
 238
 239         filter.msrc.family = filter.mdst.family = family;
 240
 241         while (argc > 0) {
 242                 if (matches(*argv, "table") == 0) {
 243                         __u32 tid;
 244
 245                         NEXT_ARG();
 246                         if (rtnl_rttable_a2n(&tid, *argv)) {
 247                                 if (strcmp(*argv, "all") == 0) {
 248                                         filter.tb = 0;
 249                                 } else if (strcmp(*argv, "help") == 0) {
 250                                         usage();
 251                                 } else {
 252                                         invarg("table id value is invalid\n", *argv);
 253                                 }
 254                         } else
 255                                 filter.tb = tid;
 256                 } else if (strcmp(*argv, "iif") == 0) {
 257                         NEXT_ARG();
 258                         id = *argv;
 259                 } else if (matches(*argv, "from") == 0) {
 260                         NEXT_ARG();
 261                         if (get_prefix(&filter.msrc, *argv, family))
 262                                 invarg("from value is invalid\n", *argv);
 263                 } else {
 264                         if (strcmp(*argv, "to") == 0) {
 265                                 NEXT_ARG();
 266                         }
 267                         if (matches(*argv, "help") == 0)
 268                                 usage();
 269                         if (get_prefix(&filter.mdst, *argv, family))
 270                                 invarg("to value is invalid\n", *argv);
 271                 }
 272                 argc--; argv++;
 273         }
 274
 275         ll_init_map(&rth);
 276
 277         if (id)  {
 278                 int idx;
 279
 280                 idx = ll_name_to_index(id);
 281                 if (!idx)
 282                         return nodev(id);
 283                 filter.iif = idx;
 284         }
 285
 286         if (rtnl_routedump_req(&rth, filter.af, NULL) < 0) {
 287                 perror("Cannot send dump request");
 288                 return 1;
 289         }
 290
 291         new_json_obj(json);
 292         if (rtnl_dump_filter(&rth, print_mroute, stdout) < 0) {
 293                 delete_json_obj();
 294                 fprintf(stderr, "Dump terminated\n");
 295                 exit(1);
 296         }
 297         delete_json_obj();
 298
 299         return 0;
 300 }
 301
 302 int do_multiroute(int argc, char **argv)
 303 {
 304         if (argc < 1)
 305                 return mroute_list(0, NULL);
 306 #if 0
 307         if (matches(*argv, "add") == 0)
 308                 return mroute_modify(RTM_NEWADDR, argc-1, argv+1);
 309         if (matches(*argv, "delete") == 0)
 310                 return mroute_modify(RTM_DELADDR, argc-1, argv+1);
 311         if (matches(*argv, "get") == 0)
 312                 return mroute_get(argc-1, argv+1);
 313 #endif
 314         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 315             || matches(*argv, "lst") == 0)
 316                 return mroute_list(argc-1, argv+1);
 317         if (matches(*argv, "help") == 0)
 318                 usage();
 319         fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
 320         exit(-1);
 321 }