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 static void vti6_print_help(struct link_util *lu, int argc, char **argv,
  28                             FILE *f)
  29 {
  30         fprintf(f,
  31                 "Usage: ... %-4s [ remote ADDR ]\n",
  32                 lu->id
  33         );
  34         fprintf(f,
  35                 "                [ local ADDR ]\n"
  36                 "                [ [i|o]key KEY ]\n"
  37                 "                [ dev PHYS_DEV ]\n"
  38                 "                [ fwmark MARK ]\n"
  39                 "\n"
  40         );
  41         fprintf(f,
  42                 "Where: ADDR := { IP%s_ADDRESS }\n"
  43                 "       KEY  := { DOTTED_QUAD | NUMBER }\n"
  44                 "       MARK := { 0x0..0xffffffff }\n",
  45                 "V6"
  46         );
  47 }
  48
  49 static int vti6_parse_opt(struct link_util *lu, int argc, char **argv,
  50                           struct nlmsghdr *n)
  51 {
  52         struct ifinfomsg *ifi = NLMSG_DATA(n);
  53         struct {
  54                 struct nlmsghdr n;
  55                 struct ifinfomsg i;
  56         } req = {
  57                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  58                 .n.nlmsg_flags = NLM_F_REQUEST,
  59                 .n.nlmsg_type = RTM_GETLINK,
  60                 .i.ifi_family = preferred_family,
  61                 .i.ifi_index = ifi->ifi_index,
  62         };
  63         struct nlmsghdr *answer;
  64         struct rtattr *tb[IFLA_MAX + 1];
  65         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  66         struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
  67         __be32 ikey = 0;
  68         __be32 okey = 0;
  69         inet_prefix saddr, daddr;
  70         unsigned int link = 0;
  71         __u32 fwmark = 0;
  72         int len;
  73
  74         inet_prefix_reset(&saddr);
  75         inet_prefix_reset(&daddr);
  76
  77         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  78                 const struct rtattr *rta;
  79
  80                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
  81 get_failed:
  82                         fprintf(stderr,
  83                                 "Failed to get existing tunnel info.\n");
  84                         return -1;
  85                 }
  86
  87                 len = answer->nlmsg_len;
  88                 len -= NLMSG_LENGTH(sizeof(*ifi));
  89                 if (len < 0)
  90                         goto get_failed;
  91
  92                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
  93
  94                 if (!tb[IFLA_LINKINFO])
  95                         goto get_failed;
  96
  97                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
  98
  99                 if (!linkinfo[IFLA_INFO_DATA])
 100                         goto get_failed;
 101
 102                 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
 103                                     linkinfo[IFLA_INFO_DATA]);
 104
 105                 rta = vtiinfo[IFLA_VTI_LOCAL];
 106                 if (rta && get_addr_rta(&saddr, rta, AF_INET6))
 107                         goto get_failed;
 108
 109                 rta = vtiinfo[IFLA_VTI_REMOTE];
 110                 if (rta && get_addr_rta(&daddr, rta, AF_INET6))
 111                         goto get_failed;
 112
 113                 if (vtiinfo[IFLA_VTI_IKEY])
 114                         ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
 115
 116                 if (vtiinfo[IFLA_VTI_OKEY])
 117                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 118
 119                 if (vtiinfo[IFLA_VTI_LINK])
 120                         link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
 121
 122                 if (vtiinfo[IFLA_VTI_FWMARK])
 123                         fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]);
 124
 125                 free(answer);
 126         }
 127
 128         while (argc > 0) {
 129                 if (!matches(*argv, "key")) {
 130                         NEXT_ARG();
 131                         ikey = okey = tnl_parse_key("key", *argv);
 132                 } else if (!matches(*argv, "ikey")) {
 133                         NEXT_ARG();
 134                         ikey = tnl_parse_key("ikey", *argv);
 135                 } else if (!matches(*argv, "okey")) {
 136                         NEXT_ARG();
 137                         okey = tnl_parse_key("okey", *argv);
 138                 } else if (!matches(*argv, "remote")) {
 139                         NEXT_ARG();
 140                         get_addr(&daddr, *argv, AF_INET6);
 141                 } else if (!matches(*argv, "local")) {
 142                         NEXT_ARG();
 143                         get_addr(&saddr, *argv, AF_INET6);
 144                 } else if (!matches(*argv, "dev")) {
 145                         NEXT_ARG();
 146                         link = ll_name_to_index(*argv);
 147                         if (!link)
 148                                 exit(nodev(*argv));
 149                 } else if (strcmp(*argv, "fwmark") == 0) {
 150                         NEXT_ARG();
 151                         if (get_u32(&fwmark, *argv, 0))
 152                                 invarg("invalid fwmark\n", *argv);
 153                 } else {
 154                         vti6_print_help(lu, argc, argv, stderr);
 155                         return -1;
 156                 }
 157                 argc--; argv++;
 158         }
 159
 160         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 161         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 162         if (is_addrtype_inet_not_unspec(&saddr))
 163                 addattr_l(n, 1024, IFLA_VTI_LOCAL, saddr.data, saddr.bytelen);
 164         if (is_addrtype_inet_not_unspec(&daddr))
 165                 addattr_l(n, 1024, IFLA_VTI_REMOTE, daddr.data, daddr.bytelen);
 166         addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
 167         if (link)
 168                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 169
 170         return 0;
 171 }
 172
 173 static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 174 {
 175         char s2[64];
 176
 177         if (!tb)
 178                 return;
 179
 180         tnl_print_endpoint("remote", tb[IFLA_VTI_REMOTE], AF_INET6);
 181         tnl_print_endpoint("local", tb[IFLA_VTI_LOCAL], AF_INET6);
 182
 183         if (tb[IFLA_VTI_LINK]) {
 184                 __u32 link = rta_getattr_u32(tb[IFLA_VTI_LINK]);
 185
 186                 if (link) {
 187                         print_string(PRINT_ANY, "link", "dev %s ",
 188                                      ll_index_to_name(link));
 189                 }
 190         }
 191
 192         if (tb[IFLA_VTI_IKEY]) {
 193                 struct rtattr *rta = tb[IFLA_VTI_IKEY];
 194                 __u32 key = rta_getattr_u32(rta);
 195
 196                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 197                         print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 198         }
 199
 200         if (tb[IFLA_VTI_OKEY]) {
 201                 struct rtattr *rta = tb[IFLA_VTI_OKEY];
 202                 __u32 key = rta_getattr_u32(rta);
 203
 204                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 205                         print_string(PRINT_ANY, "okey", "okey %s ", s2);
 206         }
 207
 208         if (tb[IFLA_VTI_FWMARK]) {
 209                 __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
 210
 211                 if (fwmark) {
 212                         print_0xhex(PRINT_ANY,
 213                                     "fwmark", "fwmark %#llx ", fwmark);
 214                 }
 215         }
 216 }
 217
 218 struct link_util vti6_link_util = {
 219         .id = "vti6",
 220         .maxattr = IFLA_VTI_MAX,
 221         .parse_opt = vti6_parse_opt,
 222         .print_opt = vti6_print_opt,
 223         .print_help = vti6_print_help,
 224 };