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, "\n");
  36         fprintf(stderr, "Where: NAME := STRING\n");
  37         fprintf(stderr, "       ADDR := { IPV6_ADDRESS }\n");
  38         fprintf(stderr, "       KEY  := { DOTTED_QUAD | NUMBER }\n");
  39         exit(-1);
  40 }
  41
  42 static int vti6_parse_opt(struct link_util *lu, int argc, char **argv,
  43                           struct nlmsghdr *n)
  44 {
  45         struct {
  46                 struct nlmsghdr n;
  47                 struct ifinfomsg i;
  48                 char buf[1024];
  49         } req;
  50         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  51         struct rtattr *tb[IFLA_MAX + 1];
  52         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  53         struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
  54         struct in6_addr saddr;
  55         struct in6_addr daddr;
  56         unsigned ikey = 0;
  57         unsigned okey = 0;
  58         unsigned link = 0;
  59         int len;
  60
  61         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  62                 memset(&req, 0, sizeof(req));
  63
  64                 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
  65                 req.n.nlmsg_flags = NLM_F_REQUEST;
  66                 req.n.nlmsg_type = RTM_GETLINK;
  67                 req.i.ifi_family = preferred_family;
  68                 req.i.ifi_index = ifi->ifi_index;
  69
  70                 if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) {
  71 get_failed:
  72                         fprintf(stderr,
  73                                 "Failed to get existing tunnel info.\n");
  74                         return -1;
  75                 }
  76
  77                 len = req.n.nlmsg_len;
  78                 len -= NLMSG_LENGTH(sizeof(*ifi));
  79                 if (len < 0)
  80                         goto get_failed;
  81
  82                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);
  83
  84                 if (!tb[IFLA_LINKINFO])
  85                         goto get_failed;
  86
  87                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
  88
  89                 if (!linkinfo[IFLA_INFO_DATA])
  90                         goto get_failed;
  91
  92                 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
  93                                     linkinfo[IFLA_INFO_DATA]);
  94
  95                 if (vtiinfo[IFLA_VTI_IKEY])
  96                         ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
  97
  98                 if (vtiinfo[IFLA_VTI_OKEY])
  99                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 100
 101                 if (vtiinfo[IFLA_VTI_LOCAL])
 102                         memcpy(&saddr, RTA_DATA(vtiinfo[IFLA_VTI_LOCAL]), sizeof(saddr));
 103
 104                 if (vtiinfo[IFLA_VTI_REMOTE])
 105                         memcpy(&daddr, RTA_DATA(vtiinfo[IFLA_VTI_REMOTE]), sizeof(daddr));
 106
 107                 if (vtiinfo[IFLA_VTI_LINK])
 108                         link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
 109         }
 110
 111         while (argc > 0) {
 112                 if (!matches(*argv, "key")) {
 113                         unsigned uval;
 114
 115                         NEXT_ARG();
 116                         if (strchr(*argv, '.'))
 117                                 uval = get_addr32(*argv);
 118                         else {
 119                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 120                                         fprintf(stderr,
 121                                                 "Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
 122                                         exit(-1);
 123                                 }
 124                                 uval = htonl(uval);
 125                         }
 126
 127                         ikey = okey = uval;
 128                 } else if (!matches(*argv, "ikey")) {
 129                         unsigned uval;
 130
 131                         NEXT_ARG();
 132                         if (strchr(*argv, '.'))
 133                                 uval = get_addr32(*argv);
 134                         else {
 135                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 136                                         fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
 137                                         exit(-1);
 138                                 }
 139                                 uval = htonl(uval);
 140                         }
 141                         ikey = uval;
 142                 } else if (!matches(*argv, "okey")) {
 143                         unsigned uval;
 144
 145                         NEXT_ARG();
 146                         if (strchr(*argv, '.'))
 147                                 uval = get_addr32(*argv);
 148                         else {
 149                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 150                                         fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
 151                                         exit(-1);
 152                                 }
 153                                 uval = htonl(uval);
 154                         }
 155                         okey = uval;
 156                 } else if (!matches(*argv, "remote")) {
 157                         NEXT_ARG();
 158                         if (!strcmp(*argv, "any")) {
 159                                 fprintf(stderr, "invalid value for \"remote\": \"%s\"\n", *argv);
 160                                 exit(-1);
 161                         } else {
 162                                 inet_prefix addr;
 163                                 get_prefix(&addr, *argv, AF_INET6);
 164                                 memcpy(&daddr, addr.data, addr.bytelen);
 165                         }
 166                 } else if (!matches(*argv, "local")) {
 167                         NEXT_ARG();
 168                         if (!strcmp(*argv, "any")) {
 169                                 fprintf(stderr, "invalid value for \"local\": \"%s\"\n", *argv);
 170                                 exit(-1);
 171                         } else {
 172                                 inet_prefix addr;
 173                                 get_prefix(&addr, *argv, AF_INET6);
 174                                 memcpy(&saddr, addr.data, addr.bytelen);
 175                         }
 176                 } else if (!matches(*argv, "dev")) {
 177                         NEXT_ARG();
 178                         link = if_nametoindex(*argv);
 179                         if (link == 0)
 180                                 exit(-1);
 181                 } else
 182                         usage();
 183                 argc--; argv++;
 184         }
 185
 186         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 187         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 188         addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, sizeof(saddr));
 189         addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, sizeof(daddr));
 190         if (link)
 191                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 192
 193         return 0;
 194 }
 195
 196 static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 197 {
 198         char s1[1024];
 199         char s2[64];
 200         const char *local = "any";
 201         const char *remote = "any";
 202         struct in6_addr saddr;
 203         struct in6_addr daddr;
 204
 205         if (!tb)
 206                 return;
 207
 208         if (tb[IFLA_VTI_REMOTE]) {
 209                 memcpy(&daddr, RTA_DATA(tb[IFLA_VTI_REMOTE]), sizeof(daddr));
 210
 211                 remote = format_host(AF_INET6, 16, &daddr, s1, sizeof(s1));
 212         }
 213
 214         fprintf(f, "remote %s ", remote);
 215
 216         if (tb[IFLA_VTI_LOCAL]) {
 217                 memcpy(&saddr, RTA_DATA(tb[IFLA_VTI_LOCAL]), sizeof(saddr));
 218
 219                 local = format_host(AF_INET6, 16, &saddr, s1, sizeof(s1));
 220         }
 221
 222         fprintf(f, "local %s ", local);
 223
 224         if (tb[IFLA_VTI_LINK] && *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK])) {
 225                 unsigned link = *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK]);
 226                 const char *n = if_indextoname(link, s2);
 227
 228                 if (n)
 229                         fprintf(f, "dev %s ", n);
 230                 else
 231                         fprintf(f, "dev %u ", link);
 232         }
 233
 234         if (tb[IFLA_VTI_IKEY]) {
 235                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
 236                 fprintf(f, "ikey %s ", s2);
 237         }
 238
 239         if (tb[IFLA_VTI_OKEY]) {
 240                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
 241                 fprintf(f, "okey %s ", s2);
 242         }
 243 }
 244
 245 struct link_util vti6_link_util = {
 246         .id = "vti6",
 247         .maxattr = IFLA_VTI_MAX,
 248         .parse_opt = vti6_parse_opt,
 249         .print_opt = vti6_print_opt,
 250 };