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         inet_prefix saddr, daddr;
  68         unsigned int link = 0;
  69         __u32 fwmark = 0;
  70         int len;
  71
  72         inet_prefix_reset(&saddr);
  73         inet_prefix_reset(&daddr);
  74
  75         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  76                 const struct rtattr *rta;
  77
  78                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
  79 get_failed:
  80                         fprintf(stderr,
  81                                 "Failed to get existing tunnel info.\n");
  82                         return -1;
  83                 }
  84
  85                 len = answer->nlmsg_len;
  86                 len -= NLMSG_LENGTH(sizeof(*ifi));
  87                 if (len < 0)
  88                         goto get_failed;
  89
  90                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
  91
  92                 if (!tb[IFLA_LINKINFO])
  93                         goto get_failed;
  94
  95                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
  96
  97                 if (!linkinfo[IFLA_INFO_DATA])
  98                         goto get_failed;
  99
 100                 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
 101                                     linkinfo[IFLA_INFO_DATA]);
 102
 103                 rta = vtiinfo[IFLA_VTI_LOCAL];
 104                 if (rta && get_addr_rta(&saddr, rta, AF_INET))
 105                         goto get_failed;
 106
 107                 rta = vtiinfo[IFLA_VTI_REMOTE];
 108                 if (rta && get_addr_rta(&daddr, rta, AF_INET))
 109                         goto get_failed;
 110
 111                 if (vtiinfo[IFLA_VTI_IKEY])
 112                         ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
 113
 114                 if (vtiinfo[IFLA_VTI_OKEY])
 115                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 116
 117                 if (vtiinfo[IFLA_VTI_LINK])
 118                         link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
 119
 120                 if (vtiinfo[IFLA_VTI_FWMARK])
 121                         fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]);
 122
 123                 free(answer);
 124         }
 125
 126         while (argc > 0) {
 127                 if (!matches(*argv, "key")) {
 128                         NEXT_ARG();
 129                         ikey = okey = tnl_parse_key("key", *argv);
 130                 } else if (!matches(*argv, "ikey")) {
 131                         NEXT_ARG();
 132                         ikey = tnl_parse_key("ikey", *argv);
 133                 } else if (!matches(*argv, "okey")) {
 134                         NEXT_ARG();
 135                         okey = tnl_parse_key("okey", *argv);
 136                 } else if (!matches(*argv, "remote")) {
 137                         NEXT_ARG();
 138                         get_addr(&daddr, *argv, AF_INET);
 139                 } else if (!matches(*argv, "local")) {
 140                         NEXT_ARG();
 141                         get_addr(&saddr, *argv, AF_INET);
 142                 } else if (!matches(*argv, "dev")) {
 143                         NEXT_ARG();
 144                         link = ll_name_to_index(*argv);
 145                         if (!link)
 146                                 exit(nodev(*argv));
 147                 } else if (strcmp(*argv, "fwmark") == 0) {
 148                         NEXT_ARG();
 149                         if (get_u32(&fwmark, *argv, 0))
 150                                 invarg("invalid fwmark\n", *argv);
 151                 } else {
 152                         vti_print_help(lu, argc, argv, stderr);
 153                         return -1;
 154                 }
 155                 argc--; argv++;
 156         }
 157
 158         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 159         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 160         if (is_addrtype_inet_not_unspec(&saddr))
 161                 addattr_l(n, 1024, IFLA_VTI_LOCAL, saddr.data, saddr.bytelen);
 162         if (is_addrtype_inet_not_unspec(&daddr))
 163                 addattr_l(n, 1024, IFLA_VTI_REMOTE, daddr.data, daddr.bytelen);
 164         addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
 165         if (link)
 166                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 167
 168         return 0;
 169 }
 170
 171 static void vti_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 172 {
 173         char s2[64];
 174
 175         if (!tb)
 176                 return;
 177
 178         tnl_print_endpoint("remote", tb[IFLA_VTI_REMOTE], AF_INET);
 179         tnl_print_endpoint("local", tb[IFLA_VTI_LOCAL], AF_INET);
 180
 181         if (tb[IFLA_VTI_LINK]) {
 182                 __u32 link = rta_getattr_u32(tb[IFLA_VTI_LINK]);
 183
 184                 if (link) {
 185                         print_string(PRINT_ANY, "link", "dev %s ",
 186                                      ll_index_to_name(link));
 187                 }
 188         }
 189
 190         if (tb[IFLA_VTI_IKEY]) {
 191                 struct rtattr *rta = tb[IFLA_VTI_IKEY];
 192                 __u32 key = rta_getattr_u32(rta);
 193
 194                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 195                         print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 196         }
 197
 198         if (tb[IFLA_VTI_OKEY]) {
 199                 struct rtattr *rta = tb[IFLA_VTI_OKEY];
 200                 __u32 key = rta_getattr_u32(rta);
 201
 202                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 203                         print_string(PRINT_ANY, "okey", "okey %s ", s2);
 204         }
 205
 206         if (tb[IFLA_VTI_FWMARK]) {
 207                 __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
 208
 209                 if (fwmark) {
 210                         print_0xhex(PRINT_ANY,
 211                                     "fwmark", "fwmark %#llx ", fwmark);
 212                 }
 213         }
 214 }
 215
 216 struct link_util vti_link_util = {
 217         .id = "vti",
 218         .maxattr = IFLA_VTI_MAX,
 219         .parse_opt = vti_parse_opt,
 220         .print_opt = vti_print_opt,
 221         .print_help = vti_print_help,
 222 };