ip/ipila.c

   1 /*
   2  * ipila.c      ILA (Identifier Locator Addressing) support
   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:     Tom Herbert <tom@herbertland.com>
  10  */
  11
  12 #include <netdb.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <net/if.h>
  17 #include <linux/ila.h>
  18 #include <linux/genetlink.h>
  19 #include <linux/ip.h>
  20 #include <arpa/inet.h>
  21
  22 #include "libgenl.h"
  23 #include "utils.h"
  24 #include "ip_common.h"
  25
  26 static void usage(void)
  27 {
  28         fprintf(stderr, "Usage: ip ila add loc_match LOCATOR_MATCH "
  29                 "loc LOCATOR [ dev DEV ]\n");
  30         fprintf(stderr, "       ip ila del loc_match LOCATOR_MATCH "
  31                 "[ loc LOCATOR ] [ dev DEV ]\n");
  32         fprintf(stderr, "       ip ila list\n");
  33         fprintf(stderr, "\n");
  34
  35         exit(-1);
  36 }
  37
  38 /* netlink socket */
  39 static struct rtnl_handle genl_rth = { .fd = -1 };
  40 static int genl_family = -1;
  41
  42 #define ILA_REQUEST(_req, _bufsiz, _cmd, _flags)        \
  43         GENL_REQUEST(_req, _bufsiz, genl_family, 0,     \
  44                      ILA_GENL_VERSION, _cmd, _flags)
  45
  46 #define ILA_RTA(g) ((struct rtattr *)(((char *)(g)) +   \
  47         NLMSG_ALIGN(sizeof(struct genlmsghdr))))
  48
  49 #define ADDR_BUF_SIZE sizeof("xxxx:xxxx:xxxx:xxxx")
  50
  51 static int print_addr64(__u64 addr, char *buff, size_t len)
  52 {
  53         __u16 *words = (__u16 *)&addr;
  54         __u16 v;
  55         int i, ret;
  56         size_t written = 0;
  57         char *sep = ":";
  58
  59         for (i = 0; i < 4; i++) {
  60                 v = ntohs(words[i]);
  61
  62                 if (i == 3)
  63                         sep = "";
  64
  65                 ret = snprintf(&buff[written], len - written, "%x%s", v, sep);
  66                 if (ret < 0)
  67                         return ret;
  68
  69                 written += ret;
  70         }
  71
  72         return written;
  73 }
  74
  75 static void print_ila_locid(FILE *fp, int attr, struct rtattr *tb[], int space)
  76 {
  77         char abuf[256];
  78         size_t blen;
  79         int i;
  80
  81         if (tb[attr]) {
  82                 blen = print_addr64(rta_getattr_u32(tb[attr]),
  83                                     abuf, sizeof(abuf));
  84                 fprintf(fp, "%s", abuf);
  85         } else {
  86                 fprintf(fp, "-");
  87                 blen = 1;
  88         }
  89
  90         for (i = 0; i < space - blen; i++)
  91                 fprintf(fp, " ");
  92 }
  93
  94 static int print_ila_mapping(const struct sockaddr_nl *who,
  95                              struct nlmsghdr *n, void *arg)
  96 {
  97         FILE *fp = (FILE *)arg;
  98         struct genlmsghdr *ghdr;
  99         struct rtattr *tb[ILA_ATTR_MAX + 1];
 100         int len = n->nlmsg_len;
 101
 102         if (n->nlmsg_type != genl_family)
 103                 return 0;
 104
 105         len -= NLMSG_LENGTH(GENL_HDRLEN);
 106         if (len < 0)
 107                 return -1;
 108
 109         ghdr = NLMSG_DATA(n);
 110         parse_rtattr(tb, ILA_ATTR_MAX, (void *) ghdr + GENL_HDRLEN, len);
 111
 112         print_ila_locid(fp, ILA_ATTR_LOCATOR_MATCH, tb, ADDR_BUF_SIZE);
 113         print_ila_locid(fp, ILA_ATTR_LOCATOR, tb, ADDR_BUF_SIZE);
 114
 115         if (tb[ILA_ATTR_IFINDEX])
 116                 fprintf(fp, "%s", ll_index_to_name(rta_getattr_u32(tb[ILA_ATTR_IFINDEX])));
 117         else
 118                 fprintf(fp, "-");
 119         fprintf(fp, "\n");
 120
 121         return 0;
 122 }
 123
 124 #define NLMSG_BUF_SIZE 4096
 125
 126 static int do_list(int argc, char **argv)
 127 {
 128         ILA_REQUEST(req, 1024, ILA_CMD_GET, NLM_F_REQUEST | NLM_F_DUMP);
 129
 130         if (argc > 0) {
 131                 fprintf(stderr, "\"ip ila show\" does not take "
 132                         "any arguments.\n");
 133                 return -1;
 134         }
 135
 136         if (rtnl_send(&genl_rth, (void *)&req, req.n.nlmsg_len) < 0) {
 137                 perror("Cannot send dump request");
 138                 exit(1);
 139         }
 140
 141         if (rtnl_dump_filter(&genl_rth, print_ila_mapping, stdout) < 0) {
 142                 fprintf(stderr, "Dump terminated\n");
 143                 return 1;
 144         }
 145
 146         return 0;
 147 }
 148
 149 static int ila_parse_opt(int argc, char **argv, struct nlmsghdr *n,
 150                          bool adding)
 151 {
 152         __u64 locator = 0;
 153         __u64 locator_match = 0;
 154         int ifindex = 0;
 155         bool loc_set = false;
 156         bool loc_match_set = false;
 157         bool ifindex_set = false;
 158
 159         while (argc > 0) {
 160                 if (!matches(*argv, "loc")) {
 161                         NEXT_ARG();
 162
 163                         if (get_addr64(&locator, *argv) < 0) {
 164                                 fprintf(stderr, "Bad locator: %s\n", *argv);
 165                                 return -1;
 166                         }
 167                         loc_set = true;
 168                 } else if (!matches(*argv, "loc_match")) {
 169                         NEXT_ARG();
 170
 171                         if (get_addr64(&locator_match, *argv) < 0) {
 172                                 fprintf(stderr, "Bad locator to match: %s\n",
 173                                         *argv);
 174                                 return -1;
 175                         }
 176                         loc_match_set = true;
 177                 } else if (!matches(*argv, "dev")) {
 178                         NEXT_ARG();
 179
 180                         ifindex = ll_name_to_index(*argv);
 181                         if (ifindex == 0) {
 182                                 fprintf(stderr, "No such interface: %s\n",
 183                                         *argv);
 184                                 return -1;
 185                         }
 186                         ifindex_set = true;
 187                 } else {
 188                         usage();
 189                         return -1;
 190                 }
 191                 argc--, argv++;
 192         }
 193
 194         if (adding) {
 195                 if (!loc_set) {
 196                         fprintf(stderr, "ila: missing locator\n");
 197                         return -1;
 198                 }
 199                 if (!loc_match_set) {
 200                         fprintf(stderr, "ila: missing locator0match\n");
 201                         return -1;
 202                 }
 203         }
 204
 205         if (loc_match_set)
 206                 addattr64(n, 1024, ILA_ATTR_LOCATOR_MATCH, locator_match);
 207
 208         if (loc_set)
 209                 addattr64(n, 1024, ILA_ATTR_LOCATOR, locator);
 210
 211         if (ifindex_set)
 212                 addattr32(n, 1024, ILA_ATTR_IFINDEX, ifindex);
 213
 214         return 0;
 215 }
 216
 217 static int do_add(int argc, char **argv)
 218 {
 219         ILA_REQUEST(req, 1024, ILA_CMD_ADD, NLM_F_REQUEST);
 220
 221         ila_parse_opt(argc, argv, &req.n, true);
 222
 223         if (rtnl_talk(&genl_rth, &req.n, NULL, 0) < 0)
 224                 return -2;
 225
 226         return 0;
 227 }
 228
 229 static int do_del(int argc, char **argv)
 230 {
 231         ILA_REQUEST(req, 1024, ILA_CMD_DEL, NLM_F_REQUEST);
 232
 233         ila_parse_opt(argc, argv, &req.n, false);
 234
 235         if (rtnl_talk(&genl_rth, &req.n, NULL, 0) < 0)
 236                 return -2;
 237
 238         return 0;
 239 }
 240
 241 int do_ipila(int argc, char **argv)
 242 {
 243         if (argc < 1)
 244                 usage();
 245
 246         if (matches(*argv, "help") == 0)
 247                 usage();
 248
 249         if (genl_init_handle(&genl_rth, ILA_GENL_NAME, &genl_family))
 250                 exit(1);
 251
 252         if (matches(*argv, "add") == 0)
 253                 return do_add(argc-1, argv+1);
 254         if (matches(*argv, "delete") == 0)
 255                 return do_del(argc-1, argv+1);
 256         if (matches(*argv, "list") == 0)
 257                 return do_list(argc-1, argv+1);
 258
 259         fprintf(stderr, "Command \"%s\" is unknown, try \"ip ila help\".\n",
 260                 *argv);
 261         exit(-1);
 262 }