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
  27 static void print_usage(FILE *f)
  28 {
  29         fprintf(f,
  30                 "Usage: ... vti [ remote ADDR ]\n"
  31                 "               [ local ADDR ]\n"
  32                 "               [ [i|o]key KEY ]\n"
  33                 "               [ dev PHYS_DEV ]\n"
  34                 "               [ fwmark MARK ]\n"
  35                 "\n"
  36                 "Where: ADDR := { IP_ADDRESS }\n"
  37                 "       KEY  := { DOTTED_QUAD | NUMBER }\n"
  38                 "       MARK := { 0x0..0xffffffff }\n"
  39         );
  40 }
  41
  42 static void usage(void) __attribute__((noreturn));
  43 static void usage(void)
  44 {
  45         print_usage(stderr);
  46         exit(-1);
  47 }
  48
  49 static int vti_parse_opt(struct link_util *lu, int argc, char **argv,
  50                          struct nlmsghdr *n)
  51 {
  52         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  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         unsigned int saddr = 0;
  70         unsigned int daddr = 0;
  71         unsigned int link = 0;
  72         unsigned int 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                         saddr = rta_getattr_u32(vtiinfo[IFLA_VTI_LOCAL]);
 109
 110                 if (vtiinfo[IFLA_VTI_REMOTE])
 111                         daddr = rta_getattr_u32(vtiinfo[IFLA_VTI_REMOTE]);
 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                         NEXT_ARG();
 134                         daddr = get_addr32(*argv);
 135                 } else if (!matches(*argv, "local")) {
 136                         NEXT_ARG();
 137                         saddr = get_addr32(*argv);
 138                 } else if (!matches(*argv, "dev")) {
 139                         NEXT_ARG();
 140                         link = if_nametoindex(*argv);
 141                         if (link == 0) {
 142                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 143                                         *argv);
 144                                 exit(-1);
 145                         }
 146                 } else if (strcmp(*argv, "fwmark") == 0) {
 147                         NEXT_ARG();
 148                         if (get_u32(&fwmark, *argv, 0))
 149                                 invarg("invalid fwmark\n", *argv);
 150                 } else
 151                         usage();
 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         const char *local = "any";
 169         const char *remote = "any";
 170         __u32 key;
 171         unsigned int link;
 172         char s2[IFNAMSIZ];
 173
 174         if (!tb)
 175                 return;
 176
 177         if (tb[IFLA_VTI_REMOTE]) {
 178                 unsigned int addr = rta_getattr_u32(tb[IFLA_VTI_REMOTE]);
 179
 180                 if (addr)
 181                         remote = format_host(AF_INET, 4, &addr);
 182         }
 183
 184         print_string(PRINT_ANY, "remote", "remote %s ", remote);
 185
 186         if (tb[IFLA_VTI_LOCAL]) {
 187                 unsigned int addr = rta_getattr_u32(tb[IFLA_VTI_LOCAL]);
 188
 189                 if (addr)
 190                         local = format_host(AF_INET, 4, &addr);
 191         }
 192
 193         print_string(PRINT_ANY, "local", "local %s ", local);
 194
 195         if (tb[IFLA_VTI_LINK] &&
 196             (link = rta_getattr_u32(tb[IFLA_VTI_LINK]))) {
 197                 const char *n = if_indextoname(link, s2);
 198
 199                 if (n)
 200                         print_string(PRINT_ANY, "link", "dev %s ", n);
 201                 else
 202                         print_uint(PRINT_ANY, "link_index", "dev %u ", link);
 203         }
 204
 205         if (tb[IFLA_VTI_IKEY] &&
 206             (key = rta_getattr_u32(tb[IFLA_VTI_IKEY])))
 207                 print_0xhex(PRINT_ANY, "ikey", "ikey %#x ", ntohl(key));
 208
 209
 210         if (tb[IFLA_VTI_OKEY] &&
 211             (key = rta_getattr_u32(tb[IFLA_VTI_OKEY])))
 212                 print_0xhex(PRINT_ANY, "okey", "okey %#x ", ntohl(key));
 213
 214         if (tb[IFLA_VTI_FWMARK]) {
 215                 __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
 216
 217                 if (fwmark) {
 218                         SPRINT_BUF(b1);
 219
 220                         snprintf(b1, sizeof(b1), "0x%x", fwmark);
 221                         print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
 222                 }
 223         }
 224 }
 225
 226 static void vti_print_help(struct link_util *lu, int argc, char **argv,
 227         FILE *f)
 228 {
 229         print_usage(f);
 230 }
 231
 232 struct link_util vti_link_util = {
 233         .id = "vti",
 234         .maxattr = IFLA_VTI_MAX,
 235         .parse_opt = vti_parse_opt,
 236         .print_opt = vti_print_opt,
 237         .print_help = vti_print_help,
 238 };