ip/link_vti.c

   1 /*
   2  * link_vti.c   VTI driver module
   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:     Herbert Xu <herbert@gondor.apana.org.au>
  10  *          Saurabh Mohan <saurabh.mohan@vyatta.com> Modified link_gre.c for VTI
  11  */
  12
  13 #include <string.h>
  14 #include <net/if.h>
  15 #include <sys/types.h>
  16 #include <sys/socket.h>
  17 #include <arpa/inet.h>
  18
  19 #include <linux/ip.h>
  20 #include <linux/if_tunnel.h>
  21 #include "rt_names.h"
  22 #include "utils.h"
  23 #include "ip_common.h"
  24 #include "tunnel.h"
  25
  26
  27 static void print_usage(FILE *f)
  28 {
  29         fprintf(f, "Usage: ip link { add | set | change | replace | del } NAME\n");
  30         fprintf(f, "          type { vti } [ remote ADDR ] [ local ADDR ]\n");
  31         fprintf(f, "          [ [i|o]key KEY ]\n");
  32         fprintf(f, "          [ dev PHYS_DEV ]\n");
  33         fprintf(f, "\n");
  34         fprintf(f, "Where: NAME := STRING\n");
  35         fprintf(f, "       ADDR := { IP_ADDRESS }\n");
  36         fprintf(f, "       KEY  := { DOTTED_QUAD | NUMBER }\n");
  37 }
  38
  39 static void usage(void) __attribute__((noreturn));
  40 static void usage(void)
  41 {
  42         print_usage(stderr);
  43         exit(-1);
  44 }
  45
  46 static int vti_parse_opt(struct link_util *lu, int argc, char **argv,
  47                          struct nlmsghdr *n)
  48 {
  49         struct {
  50                 struct nlmsghdr n;
  51                 struct ifinfomsg i;
  52                 char buf[1024];
  53         } req;
  54         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  55         struct rtattr *tb[IFLA_MAX + 1];
  56         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  57         struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
  58         unsigned ikey = 0;
  59         unsigned okey = 0;
  60         unsigned saddr = 0;
  61         unsigned daddr = 0;
  62         unsigned link = 0;
  63         int len;
  64
  65         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  66                 memset(&req, 0, sizeof(req));
  67
  68                 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
  69                 req.n.nlmsg_flags = NLM_F_REQUEST;
  70                 req.n.nlmsg_type = RTM_GETLINK;
  71                 req.i.ifi_family = preferred_family;
  72                 req.i.ifi_index = ifi->ifi_index;
  73
  74                 if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) {
  75 get_failed:
  76                         fprintf(stderr,
  77                                 "Failed to get existing tunnel info.\n");
  78                         return -1;
  79                 }
  80
  81                 len = req.n.nlmsg_len;
  82                 len -= NLMSG_LENGTH(sizeof(*ifi));
  83                 if (len < 0)
  84                         goto get_failed;
  85
  86                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);
  87
  88                 if (!tb[IFLA_LINKINFO])
  89                         goto get_failed;
  90
  91                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
  92
  93                 if (!linkinfo[IFLA_INFO_DATA])
  94                         goto get_failed;
  95
  96                 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
  97                                     linkinfo[IFLA_INFO_DATA]);
  98
  99                 if (vtiinfo[IFLA_VTI_IKEY])
 100                         ikey = *(__u32 *)RTA_DATA(vtiinfo[IFLA_VTI_IKEY]);
 101
 102                 if (vtiinfo[IFLA_VTI_OKEY])
 103                         okey = *(__u32 *)RTA_DATA(vtiinfo[IFLA_VTI_OKEY]);
 104
 105                 if (vtiinfo[IFLA_VTI_LOCAL])
 106                         saddr = *(__u32 *)RTA_DATA(vtiinfo[IFLA_VTI_LOCAL]);
 107
 108                 if (vtiinfo[IFLA_VTI_REMOTE])
 109                         daddr = *(__u32 *)RTA_DATA(vtiinfo[IFLA_VTI_REMOTE]);
 110
 111                 if (vtiinfo[IFLA_VTI_LINK])
 112                         link = *(__u8 *)RTA_DATA(vtiinfo[IFLA_VTI_LINK]);
 113         }
 114
 115         while (argc > 0) {
 116                 if (!matches(*argv, "key")) {
 117                         unsigned uval;
 118
 119                         NEXT_ARG();
 120                         if (strchr(*argv, '.'))
 121                                 uval = get_addr32(*argv);
 122                         else {
 123                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 124                                         fprintf(stderr,
 125                                                 "Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
 126                                         exit(-1);
 127                                 }
 128                                 uval = htonl(uval);
 129                         }
 130
 131                         ikey = okey = uval;
 132                 } else if (!matches(*argv, "ikey")) {
 133                         unsigned uval;
 134
 135                         NEXT_ARG();
 136                         if (strchr(*argv, '.'))
 137                                 uval = get_addr32(*argv);
 138                         else {
 139                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 140                                         fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
 141                                         exit(-1);
 142                                 }
 143                                 uval = htonl(uval);
 144                         }
 145                         ikey = uval;
 146                 } else if (!matches(*argv, "okey")) {
 147                         unsigned uval;
 148
 149                         NEXT_ARG();
 150                         if (strchr(*argv, '.'))
 151                                 uval = get_addr32(*argv);
 152                         else {
 153                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 154                                         fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
 155                                         exit(-1);
 156                                 }
 157                                 uval = htonl(uval);
 158                         }
 159                         okey = uval;
 160                 } else if (!matches(*argv, "remote")) {
 161                         NEXT_ARG();
 162                         if (!strcmp(*argv, "any")) {
 163                                 fprintf(stderr, "invalid value for \"remote\": \"%s\"\n", *argv);
 164                                 exit(-1);
 165                         } else {
 166                                 daddr = get_addr32(*argv);
 167                         }
 168                 } else if (!matches(*argv, "local")) {
 169                         NEXT_ARG();
 170                         if (!strcmp(*argv, "any")) {
 171                                 fprintf(stderr, "invalid value for \"local\": \"%s\"\n", *argv);
 172                                 exit(-1);
 173                         } else {
 174                                 saddr = get_addr32(*argv);
 175                         }
 176                 } else if (!matches(*argv, "dev")) {
 177                         NEXT_ARG();
 178                         link = if_nametoindex(*argv);
 179                         if (link == 0) {
 180                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 181                                         *argv);
 182                                 exit(-1);
 183                         }
 184                 } else
 185                         usage();
 186                 argc--; argv++;
 187         }
 188
 189         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 190         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 191         addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, 4);
 192         addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, 4);
 193         if (link)
 194                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 195
 196         return 0;
 197 }
 198
 199 static void vti_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 200 {
 201         char s1[1024];
 202         char s2[64];
 203         const char *local = "any";
 204         const char *remote = "any";
 205
 206         if (!tb)
 207                 return;
 208
 209         if (tb[IFLA_VTI_REMOTE]) {
 210                 unsigned addr = *(__u32 *)RTA_DATA(tb[IFLA_VTI_REMOTE]);
 211
 212                 if (addr)
 213                         remote = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
 214         }
 215
 216         fprintf(f, "remote %s ", remote);
 217
 218         if (tb[IFLA_VTI_LOCAL]) {
 219                 unsigned addr = *(__u32 *)RTA_DATA(tb[IFLA_VTI_LOCAL]);
 220
 221                 if (addr)
 222                         local = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
 223         }
 224
 225         fprintf(f, "local %s ", local);
 226
 227         if (tb[IFLA_VTI_LINK] && *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK])) {
 228                 unsigned link = *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK]);
 229                 const char *n = if_indextoname(link, s2);
 230
 231                 if (n)
 232                         fprintf(f, "dev %s ", n);
 233                 else
 234                         fprintf(f, "dev %u ", link);
 235         }
 236
 237         if (tb[IFLA_VTI_IKEY]) {
 238                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
 239                 fprintf(f, "ikey %s ", s2);
 240         }
 241
 242         if (tb[IFLA_VTI_OKEY]) {
 243                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
 244                 fprintf(f, "okey %s ", s2);
 245         }
 246 }
 247
 248 static void vti_print_help(struct link_util *lu, int argc, char **argv,
 249         FILE *f)
 250 {
 251         print_usage(f);
 252 }
 253
 254 struct link_util vti_link_util = {
 255         .id = "vti",
 256         .maxattr = IFLA_VTI_MAX,
 257         .parse_opt = vti_parse_opt,
 258         .print_opt = vti_print_opt,
 259         .print_help = vti_print_help,
 260 };