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 static void vti_print_help(struct link_util *lu, int argc, char **argv, FILE *f)
  27 {
  28         fprintf(f,
  29                 "Usage: ... %-4s [ remote ADDR ]\n",
  30                 lu->id
  31         );
  32         fprintf(f,
  33                 "                [ local ADDR ]\n"
  34                 "                [ [i|o]key KEY ]\n"
  35                 "                [ dev PHYS_DEV ]\n"
  36                 "                [ fwmark MARK ]\n"
  37                 "\n"
  38         );
  39         fprintf(f,
  40                 "Where: ADDR := { IP%s_ADDRESS }\n"
  41                 "       KEY  := { DOTTED_QUAD | NUMBER }\n"
  42                 "       MARK := { 0x0..0xffffffff }\n",
  43                 ""
  44         );
  45 }
  46
  47 static int vti_parse_opt(struct link_util *lu, int argc, char **argv,
  48                          struct nlmsghdr *n)
  49 {
  50         struct ifinfomsg *ifi = NLMSG_DATA(n);
  51         struct {
  52                 struct nlmsghdr n;
  53                 struct ifinfomsg i;
  54         } req = {
  55                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  56                 .n.nlmsg_flags = NLM_F_REQUEST,
  57                 .n.nlmsg_type = RTM_GETLINK,
  58                 .i.ifi_family = preferred_family,
  59                 .i.ifi_index = ifi->ifi_index,
  60         };
  61         struct nlmsghdr *answer;
  62         struct rtattr *tb[IFLA_MAX + 1];
  63         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  64         struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
  65         __be32 ikey = 0;
  66         __be32 okey = 0;
  67         unsigned int saddr = 0;
  68         unsigned int daddr = 0;
  69         unsigned int link = 0;
  70         __u32 fwmark = 0;
  71         int len;
  72
  73         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  74                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
  75 get_failed:
  76                         fprintf(stderr,
  77                                 "Failed to get existing tunnel info.\n");
  78                         return -1;
  79                 }
  80
  81                 len = answer->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(NLMSG_DATA(answer)), 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 = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
 101
 102                 if (vtiinfo[IFLA_VTI_OKEY])
 103                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 104
 105                 if (vtiinfo[IFLA_VTI_LOCAL])
 106                         saddr = rta_getattr_u32(vtiinfo[IFLA_VTI_LOCAL]);
 107
 108                 if (vtiinfo[IFLA_VTI_REMOTE])
 109                         daddr = rta_getattr_u32(vtiinfo[IFLA_VTI_REMOTE]);
 110
 111                 if (vtiinfo[IFLA_VTI_LINK])
 112                         link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
 113
 114                 if (vtiinfo[IFLA_VTI_FWMARK])
 115                         fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]);
 116
 117                 free(answer);
 118         }
 119
 120         while (argc > 0) {
 121                 if (!matches(*argv, "key")) {
 122                         NEXT_ARG();
 123                         ikey = okey = tnl_parse_key("key", *argv);
 124                 } else if (!matches(*argv, "ikey")) {
 125                         NEXT_ARG();
 126                         ikey = tnl_parse_key("ikey", *argv);
 127                 } else if (!matches(*argv, "okey")) {
 128                         NEXT_ARG();
 129                         okey = tnl_parse_key("okey", *argv);
 130                 } else if (!matches(*argv, "remote")) {
 131                         NEXT_ARG();
 132                         daddr = get_addr32(*argv);
 133                 } else if (!matches(*argv, "local")) {
 134                         NEXT_ARG();
 135                         saddr = get_addr32(*argv);
 136                 } else if (!matches(*argv, "dev")) {
 137                         NEXT_ARG();
 138                         link = ll_name_to_index(*argv);
 139                         if (link == 0) {
 140                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 141                                         *argv);
 142                                 exit(-1);
 143                         }
 144                 } else if (strcmp(*argv, "fwmark") == 0) {
 145                         NEXT_ARG();
 146                         if (get_u32(&fwmark, *argv, 0))
 147                                 invarg("invalid fwmark\n", *argv);
 148                 } else {
 149                         vti_print_help(lu, argc, argv, stderr);
 150                         return -1;
 151                 }
 152                 argc--; argv++;
 153         }
 154
 155         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 156         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 157         addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, 4);
 158         addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, 4);
 159         addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
 160         if (link)
 161                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 162
 163         return 0;
 164 }
 165
 166 static void vti_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 167 {
 168         char s2[64];
 169
 170         if (!tb)
 171                 return;
 172
 173         tnl_print_endpoint("remote", tb[IFLA_VTI_REMOTE], AF_INET);
 174         tnl_print_endpoint("local", tb[IFLA_VTI_LOCAL], AF_INET);
 175
 176         if (tb[IFLA_VTI_LINK]) {
 177                 __u32 link = rta_getattr_u32(tb[IFLA_VTI_LINK]);
 178
 179                 if (link) {
 180                         print_string(PRINT_ANY, "link", "dev %s ",
 181                                      ll_index_to_name(link));
 182                 }
 183         }
 184
 185         if (tb[IFLA_VTI_IKEY]) {
 186                 struct rtattr *rta = tb[IFLA_VTI_IKEY];
 187                 __u32 key = rta_getattr_u32(rta);
 188
 189                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 190                         print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 191         }
 192
 193         if (tb[IFLA_VTI_OKEY]) {
 194                 struct rtattr *rta = tb[IFLA_VTI_OKEY];
 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, "okey", "okey %s ", s2);
 199         }
 200
 201         if (tb[IFLA_VTI_FWMARK]) {
 202                 __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
 203
 204                 if (fwmark) {
 205                         print_0xhex(PRINT_ANY,
 206                                     "fwmark", "fwmark 0x%x ", fwmark);
 207                 }
 208         }
 209 }
 210
 211 struct link_util vti_link_util = {
 212         .id = "vti",
 213         .maxattr = IFLA_VTI_MAX,
 214         .parse_opt = vti_parse_opt,
 215         .print_opt = vti_print_opt,
 216         .print_help = vti_print_help,
 217 };