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         struct in6_addr saddr = IN6ADDR_ANY_INIT;
  68         struct in6_addr daddr = IN6ADDR_ANY_INIT;
  69         __be32 ikey = 0;
  70         __be32 okey = 0;
  71         unsigned int link = 0;
  72         __u32 fwmark = 0;
  73         int len;
  74
  75         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  76                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
  77 get_failed:
  78                         fprintf(stderr,
  79                                 "Failed to get existing tunnel info.\n");
  80                         return -1;
  81                 }
  82
  83                 len = answer->nlmsg_len;
  84                 len -= NLMSG_LENGTH(sizeof(*ifi));
  85                 if (len < 0)
  86                         goto get_failed;
  87
  88                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
  89
  90                 if (!tb[IFLA_LINKINFO])
  91                         goto get_failed;
  92
  93                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
  94
  95                 if (!linkinfo[IFLA_INFO_DATA])
  96                         goto get_failed;
  97
  98                 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
  99                                     linkinfo[IFLA_INFO_DATA]);
 100
 101                 if (vtiinfo[IFLA_VTI_IKEY])
 102                         ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
 103
 104                 if (vtiinfo[IFLA_VTI_OKEY])
 105                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 106
 107                 if (vtiinfo[IFLA_VTI_LOCAL])
 108                         memcpy(&saddr, RTA_DATA(vtiinfo[IFLA_VTI_LOCAL]), sizeof(saddr));
 109
 110                 if (vtiinfo[IFLA_VTI_REMOTE])
 111                         memcpy(&daddr, RTA_DATA(vtiinfo[IFLA_VTI_REMOTE]), sizeof(daddr));
 112
 113                 if (vtiinfo[IFLA_VTI_LINK])
 114                         link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
 115
 116                 if (vtiinfo[IFLA_VTI_FWMARK])
 117                         fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]);
 118
 119                 free(answer);
 120         }
 121
 122         while (argc > 0) {
 123                 if (!matches(*argv, "key")) {
 124                         NEXT_ARG();
 125                         ikey = okey = tnl_parse_key("key", *argv);
 126                 } else if (!matches(*argv, "ikey")) {
 127                         NEXT_ARG();
 128                         ikey = tnl_parse_key("ikey", *argv);
 129                 } else if (!matches(*argv, "okey")) {
 130                         NEXT_ARG();
 131                         okey = tnl_parse_key("okey", *argv);
 132                 } else if (!matches(*argv, "remote")) {
 133                         inet_prefix addr;
 134
 135                         NEXT_ARG();
 136                         get_addr(&addr, *argv, AF_INET6);
 137                         memcpy(&daddr, addr.data, sizeof(daddr));
 138                 } else if (!matches(*argv, "local")) {
 139                         inet_prefix addr;
 140
 141                         NEXT_ARG();
 142                         get_addr(&addr, *argv, AF_INET6);
 143                         memcpy(&saddr, addr.data, sizeof(saddr));
 144                 } else if (!matches(*argv, "dev")) {
 145                         NEXT_ARG();
 146                         link = ll_name_to_index(*argv);
 147                         if (link == 0) {
 148                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 149                                         *argv);
 150                                 exit(-1);
 151                         }
 152                 } else if (strcmp(*argv, "fwmark") == 0) {
 153                         NEXT_ARG();
 154                         if (get_u32(&fwmark, *argv, 0))
 155                                 invarg("invalid fwmark\n", *argv);
 156                 } else {
 157                         vti6_print_help(lu, argc, argv, stderr);
 158                         return -1;
 159                 }
 160                 argc--; argv++;
 161         }
 162
 163         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 164         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 165         addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, sizeof(saddr));
 166         addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, sizeof(daddr));
 167         addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
 168         if (link)
 169                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 170
 171         return 0;
 172 }
 173
 174 static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 175 {
 176         char s2[64];
 177
 178         if (!tb)
 179                 return;
 180
 181         tnl_print_endpoint("remote", tb[IFLA_VTI_REMOTE], AF_INET6);
 182         tnl_print_endpoint("local", tb[IFLA_VTI_LOCAL], AF_INET6);
 183
 184         if (tb[IFLA_VTI_LINK]) {
 185                 unsigned int link = rta_getattr_u32(tb[IFLA_VTI_LINK]);
 186
 187                 if (link) {
 188                         print_string(PRINT_ANY, "link", "dev %s ",
 189                                      ll_index_to_name(link));
 190                 }
 191         }
 192
 193         if (tb[IFLA_VTI_IKEY]) {
 194                 struct rtattr *rta = tb[IFLA_VTI_IKEY];
 195                 __u32 key = rta_getattr_u32(rta);
 196
 197                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 198                         print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 199         }
 200
 201         if (tb[IFLA_VTI_OKEY]) {
 202                 struct rtattr *rta = tb[IFLA_VTI_OKEY];
 203                 __u32 key = rta_getattr_u32(rta);
 204
 205                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 206                         print_string(PRINT_ANY, "okey", "okey %s ", s2);
 207         }
 208
 209         if (tb[IFLA_VTI_FWMARK]) {
 210                 __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
 211
 212                 if (fwmark) {
 213                         print_0xhex(PRINT_ANY,
 214                                     "fwmark", "fwmark 0x%x ", fwmark);
 215                 }
 216         }
 217 }
 218
 219 struct link_util vti6_link_util = {
 220         .id = "vti6",
 221         .maxattr = IFLA_VTI_MAX,
 222         .parse_opt = vti6_parse_opt,
 223         .print_opt = vti6_print_opt,
 224         .print_help = vti6_print_help,
 225 };