ip/link_vti6.c

   1 /*
   2  * link_vti6.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  *              Steffen Klassert <steffen.klassert@secunet.com> Modified link_vti.c for IPv6
  12  */
  13
  14 #include <string.h>
  15 #include <net/if.h>
  16 #include <sys/types.h>
  17 #include <sys/socket.h>
  18 #include <arpa/inet.h>
  19
  20 #include <linux/ip.h>
  21 #include <linux/if_tunnel.h>
  22 #include "rt_names.h"
  23 #include "utils.h"
  24 #include "ip_common.h"
  25 #include "tunnel.h"
  26
  27
  28 static void usage(void) __attribute__((noreturn));
  29 static void usage(void)
  30 {
  31         fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n");
  32         fprintf(stderr, "          type { vti6 } [ remote ADDR ] [ local ADDR ]\n");
  33         fprintf(stderr, "          [ [i|o]key KEY ]\n");
  34         fprintf(stderr, "          [ dev PHYS_DEV ]\n");
  35         fprintf(stderr, "          [ fwmark MARK ]\n");
  36         fprintf(stderr, "\n");
  37         fprintf(stderr, "Where: NAME := STRING\n");
  38         fprintf(stderr, "       ADDR := { IPV6_ADDRESS }\n");
  39         fprintf(stderr, "       KEY  := { DOTTED_QUAD | NUMBER }\n");
  40         fprintf(stderr, "       MARK := { 0x0..0xffffffff }\n");
  41         exit(-1);
  42 }
  43
  44 static int vti6_parse_opt(struct link_util *lu, int argc, char **argv,
  45                           struct nlmsghdr *n)
  46 {
  47         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  48         struct {
  49                 struct nlmsghdr n;
  50                 struct ifinfomsg i;
  51                 char buf[1024];
  52         } req = {
  53                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  54                 .n.nlmsg_flags = NLM_F_REQUEST,
  55                 .n.nlmsg_type = RTM_GETLINK,
  56                 .i.ifi_family = preferred_family,
  57                 .i.ifi_index = ifi->ifi_index,
  58         };
  59         struct rtattr *tb[IFLA_MAX + 1];
  60         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  61         struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
  62         struct in6_addr saddr;
  63         struct in6_addr daddr;
  64         unsigned int ikey = 0;
  65         unsigned int okey = 0;
  66         unsigned int link = 0;
  67         __u32 fwmark = 0;
  68         int len;
  69
  70         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  71                 if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) {
  72 get_failed:
  73                         fprintf(stderr,
  74                                 "Failed to get existing tunnel info.\n");
  75                         return -1;
  76                 }
  77
  78                 len = req.n.nlmsg_len;
  79                 len -= NLMSG_LENGTH(sizeof(*ifi));
  80                 if (len < 0)
  81                         goto get_failed;
  82
  83                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);
  84
  85                 if (!tb[IFLA_LINKINFO])
  86                         goto get_failed;
  87
  88                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
  89
  90                 if (!linkinfo[IFLA_INFO_DATA])
  91                         goto get_failed;
  92
  93                 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
  94                                     linkinfo[IFLA_INFO_DATA]);
  95
  96                 if (vtiinfo[IFLA_VTI_IKEY])
  97                         ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
  98
  99                 if (vtiinfo[IFLA_VTI_OKEY])
 100                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 101
 102                 if (vtiinfo[IFLA_VTI_LOCAL])
 103                         memcpy(&saddr, RTA_DATA(vtiinfo[IFLA_VTI_LOCAL]), sizeof(saddr));
 104
 105                 if (vtiinfo[IFLA_VTI_REMOTE])
 106                         memcpy(&daddr, RTA_DATA(vtiinfo[IFLA_VTI_REMOTE]), sizeof(daddr));
 107
 108                 if (vtiinfo[IFLA_VTI_LINK])
 109                         link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
 110
 111                 if (vtiinfo[IFLA_VTI_FWMARK])
 112                         fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]);
 113         }
 114
 115         while (argc > 0) {
 116                 if (!matches(*argv, "key")) {
 117                         unsigned int 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 int 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 int 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                                 inet_prefix addr;
 167
 168                                 get_prefix(&addr, *argv, AF_INET6);
 169                                 memcpy(&daddr, addr.data, addr.bytelen);
 170                         }
 171                 } else if (!matches(*argv, "local")) {
 172                         NEXT_ARG();
 173                         if (!strcmp(*argv, "any")) {
 174                                 fprintf(stderr, "invalid value for \"local\": \"%s\"\n", *argv);
 175                                 exit(-1);
 176                         } else {
 177                                 inet_prefix addr;
 178
 179                                 get_prefix(&addr, *argv, AF_INET6);
 180                                 memcpy(&saddr, addr.data, addr.bytelen);
 181                         }
 182                 } else if (!matches(*argv, "dev")) {
 183                         NEXT_ARG();
 184                         link = if_nametoindex(*argv);
 185                         if (link == 0)
 186                                 exit(-1);
 187                 } else if (strcmp(*argv, "fwmark") == 0) {
 188                         NEXT_ARG();
 189                         if (get_u32(&fwmark, *argv, 0))
 190                                 invarg("invalid fwmark\n", *argv);
 191                 } else
 192                         usage();
 193                 argc--; argv++;
 194         }
 195
 196         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 197         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 198         addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, sizeof(saddr));
 199         addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, sizeof(daddr));
 200         addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
 201         if (link)
 202                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 203
 204         return 0;
 205 }
 206
 207 static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 208 {
 209         const char *local = "any";
 210         const char *remote = "any";
 211         struct in6_addr saddr;
 212         struct in6_addr daddr;
 213         unsigned int link;
 214         char s2[64];
 215
 216         if (!tb)
 217                 return;
 218
 219         if (tb[IFLA_VTI_REMOTE]) {
 220                 memcpy(&daddr, RTA_DATA(tb[IFLA_VTI_REMOTE]), sizeof(daddr));
 221
 222                 remote = format_host(AF_INET6, 16, &daddr);
 223         }
 224
 225         fprintf(f, "remote %s ", remote);
 226
 227         if (tb[IFLA_VTI_LOCAL]) {
 228                 memcpy(&saddr, RTA_DATA(tb[IFLA_VTI_LOCAL]), sizeof(saddr));
 229
 230                 local = format_host(AF_INET6, 16, &saddr);
 231         }
 232
 233         fprintf(f, "local %s ", local);
 234
 235         if (tb[IFLA_VTI_LINK] && (link = rta_getattr_u32(tb[IFLA_VTI_LINK]))) {
 236                 const char *n = if_indextoname(link, s2);
 237
 238                 if (n)
 239                         fprintf(f, "dev %s ", n);
 240                 else
 241                         fprintf(f, "dev %u ", link);
 242         }
 243
 244         if (tb[IFLA_VTI_IKEY]) {
 245                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
 246                 fprintf(f, "ikey %s ", s2);
 247         }
 248
 249         if (tb[IFLA_VTI_OKEY]) {
 250                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
 251                 fprintf(f, "okey %s ", s2);
 252         }
 253
 254         if (tb[IFLA_VTI_FWMARK] && rta_getattr_u32(tb[IFLA_VTI_FWMARK])) {
 255                 fprintf(f, "fwmark 0x%x ", rta_getattr_u32(tb[IFLA_VTI_FWMARK]));
 256         }
 257 }
 258
 259 struct link_util vti6_link_util = {
 260         .id = "vti6",
 261         .maxattr = IFLA_VTI_MAX,
 262         .parse_opt = vti6_parse_opt,
 263         .print_opt = vti6_print_opt,
 264 };