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(const struct sockaddr_nl *who, 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         if (r->rtm_type != RTN_MULTICAST) {
  79                 fprintf(stderr, "Not a multicast route (type: %s)\n",
  80                         rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
  81                 return 0;
  82         }
  83
  84         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
  85         table = rtm_get_table(r, tb);
  86
  87         if (filter.tb > 0 && filter.tb != table)
  88                 return 0;
  89
  90         if (tb[RTA_IIF])
  91                 iif = rta_getattr_u32(tb[RTA_IIF]);
  92         if (filter.iif && filter.iif != iif)
  93                 return 0;
  94
  95         if (filter.af && filter.af != r->rtm_family)
  96                 return 0;
  97
  98         if (inet_addr_match_rta(&filter.mdst, tb[RTA_DST]))
  99                 return 0;
 100
 101         if (inet_addr_match_rta(&filter.msrc, tb[RTA_SRC]))
 102                 return 0;
 103
 104         family = get_real_family(r->rtm_type, r->rtm_family);
 105
 106         open_json_object(NULL);
 107         if (n->nlmsg_type == RTM_DELROUTE)
 108                 print_bool(PRINT_ANY, "deleted", "Deleted ", true);
 109
 110         if (tb[RTA_SRC])
 111                 src = rt_addr_n2a_r(family, RTA_PAYLOAD(tb[RTA_SRC]),
 112                                     RTA_DATA(tb[RTA_SRC]), b1, sizeof(b1));
 113         else
 114                 src = "unknown";
 115
 116         if (tb[RTA_DST])
 117                 dst = rt_addr_n2a_r(family, RTA_PAYLOAD(tb[RTA_DST]),
 118                                     RTA_DATA(tb[RTA_DST]), b2, sizeof(b2));
 119         else
 120                 dst = "unknown";
 121
 122         if (is_json_context()) {
 123                 print_string(PRINT_JSON, "src", NULL, src);
 124                 print_string(PRINT_JSON, "dst", NULL, dst);
 125         } else {
 126                 char obuf[256];
 127
 128                 snprintf(obuf, sizeof(obuf), "(%s,%s)", src, dst);
 129                 print_string(PRINT_FP, NULL,
 130                              "%-32s Iif: ", obuf);
 131         }
 132
 133         if (iif)
 134                 print_color_string(PRINT_ANY, COLOR_IFNAME,
 135                                    "iif", "%-10s ", ll_index_to_name(iif));
 136         else
 137                 print_string(PRINT_ANY,"iif", "%s ", "unresolved");
 138
 139         if (tb[RTA_MULTIPATH]) {
 140                 struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
 141                 int first = 1;
 142
 143                 open_json_array(PRINT_JSON, "multipath");
 144                 len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
 145
 146                 for (;;) {
 147                         if (len < sizeof(*nh))
 148                                 break;
 149                         if (nh->rtnh_len > len)
 150                                 break;
 151
 152                         open_json_object(NULL);
 153                         if (first) {
 154                                 print_string(PRINT_FP, NULL, "Oifs: ", NULL);
 155                                 first = 0;
 156                         }
 157
 158                         print_color_string(PRINT_ANY, COLOR_IFNAME,
 159                                            "oif", "%s", ll_index_to_name(nh->rtnh_ifindex));
 160
 161                         if (nh->rtnh_hops > 1)
 162                                 print_uint(PRINT_ANY,
 163                                            "ttl", "(ttl %u) ", nh->rtnh_hops);
 164                         else
 165                                 print_string(PRINT_FP, NULL, " ", NULL);
 166
 167                         close_json_object();
 168                         len -= NLMSG_ALIGN(nh->rtnh_len);
 169                         nh = RTNH_NEXT(nh);
 170                 }
 171                 close_json_array(PRINT_JSON, NULL);
 172         }
 173
 174         print_string(PRINT_ANY, "state", " State: %s",
 175                      (r->rtm_flags & RTNH_F_UNRESOLVED) ? "unresolved" : "resolved");
 176
 177         if (r->rtm_flags & RTNH_F_OFFLOAD)
 178                 print_null(PRINT_ANY, "offload", " offload", NULL);
 179
 180         if (show_stats && tb[RTA_MFC_STATS]) {
 181                 struct rta_mfc_stats *mfcs = RTA_DATA(tb[RTA_MFC_STATS]);
 182
 183                 print_string(PRINT_FP, NULL, "%s", _SL_);
 184                 print_uint(PRINT_ANY, "packets", "  %"PRIu64" packets,",
 185                            mfcs->mfcs_packets);
 186                 print_uint(PRINT_ANY, "bytes", " %"PRIu64" bytes", mfcs->mfcs_bytes);
 187
 188                 if (mfcs->mfcs_wrong_if)
 189                         print_uint(PRINT_ANY, "wrong_if",
 190                                    ", %"PRIu64" arrived on wrong iif.",
 191                                    mfcs->mfcs_wrong_if);
 192         }
 193
 194         if (show_stats && tb[RTA_EXPIRES]) {
 195                 struct timeval tv;
 196                 double age;
 197
 198                 __jiffies_to_tv(&tv, rta_getattr_u64(tb[RTA_EXPIRES]));
 199                 age = tv.tv_sec;
 200                 age += tv.tv_usec / 1000000.;
 201                 print_float(PRINT_ANY, "expires",
 202                             ", Age %.2f", age);
 203         }
 204
 205         if (table && (table != RT_TABLE_MAIN || show_details > 0) && !filter.tb)
 206                 print_string(PRINT_ANY, "table", " Table: %s",
 207                              rtnl_rttable_n2a(table, b1, sizeof(b1)));
 208
 209         print_string(PRINT_FP, NULL, "\n", NULL);
 210         close_json_object();
 211         return 0;
 212 }
 213
 214 void ipmroute_reset_filter(int ifindex)
 215 {
 216         memset(&filter, 0, sizeof(filter));
 217         filter.mdst.bitlen = -1;
 218         filter.msrc.bitlen = -1;
 219         filter.iif = ifindex;
 220 }
 221
 222 static int mroute_list(int argc, char **argv)
 223 {
 224         char *id = NULL;
 225         int family;
 226
 227         ipmroute_reset_filter(0);
 228         if (preferred_family == AF_UNSPEC)
 229                 family = AF_INET;
 230         else
 231                 family = AF_INET6;
 232         if (family == AF_INET) {
 233                 filter.af = RTNL_FAMILY_IPMR;
 234                 filter.tb = RT_TABLE_DEFAULT;  /* for backward compatibility */
 235         } else
 236                 filter.af = RTNL_FAMILY_IP6MR;
 237
 238         filter.msrc.family = filter.mdst.family = family;
 239
 240         while (argc > 0) {
 241                 if (matches(*argv, "table") == 0) {
 242                         __u32 tid;
 243
 244                         NEXT_ARG();
 245                         if (rtnl_rttable_a2n(&tid, *argv)) {
 246                                 if (strcmp(*argv, "all") == 0) {
 247                                         filter.tb = 0;
 248                                 } else if (strcmp(*argv, "help") == 0) {
 249                                         usage();
 250                                 } else {
 251                                         invarg("table id value is invalid\n", *argv);
 252                                 }
 253                         } else
 254                                 filter.tb = tid;
 255                 } else if (strcmp(*argv, "iif") == 0) {
 256                         NEXT_ARG();
 257                         id = *argv;
 258                 } else if (matches(*argv, "from") == 0) {
 259                         NEXT_ARG();
 260                         if (get_prefix(&filter.msrc, *argv, family))
 261                                 invarg("from value is invalid\n", *argv);
 262                 } else {
 263                         if (strcmp(*argv, "to") == 0) {
 264                                 NEXT_ARG();
 265                         }
 266                         if (matches(*argv, "help") == 0)
 267                                 usage();
 268                         if (get_prefix(&filter.mdst, *argv, family))
 269                                 invarg("to value is invalid\n", *argv);
 270                 }
 271                 argc--; argv++;
 272         }
 273
 274         ll_init_map(&rth);
 275
 276         if (id)  {
 277                 int idx;
 278
 279                 idx = ll_name_to_index(id);
 280                 if (!idx)
 281                         return nodev(id);
 282                 filter.iif = idx;
 283         }
 284
 285         if (rtnl_wilddump_request(&rth, filter.af, RTM_GETROUTE) < 0) {
 286                 perror("Cannot send dump request");
 287                 return 1;
 288         }
 289
 290         new_json_obj(json);
 291         if (rtnl_dump_filter(&rth, print_mroute, stdout) < 0) {
 292                 delete_json_obj();
 293                 fprintf(stderr, "Dump terminated\n");
 294                 exit(1);
 295         }
 296         delete_json_obj();
 297
 298         return 0;
 299 }
 300
 301 int do_multiroute(int argc, char **argv)
 302 {
 303         if (argc < 1)
 304                 return mroute_list(0, NULL);
 305 #if 0
 306         if (matches(*argv, "add") == 0)
 307                 return mroute_modify(RTM_NEWADDR, argc-1, argv+1);
 308         if (matches(*argv, "delete") == 0)
 309                 return mroute_modify(RTM_DELADDR, argc-1, argv+1);
 310         if (matches(*argv, "get") == 0)
 311                 return mroute_get(argc-1, argv+1);
 312 #endif
 313         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 314             || matches(*argv, "lst") == 0)
 315                 return mroute_list(argc-1, argv+1);
 316         if (matches(*argv, "help") == 0)
 317                 usage();
 318         fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
 319         exit(-1);
 320 }