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
  28 static void usage(void) __attribute__((noreturn));
  29 static void usage(void)
  30 {
  31         fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n");
  32         fprintf(stderr, "          type { vti6 } [ remote ADDR ] [ local ADDR ]\n");
  33         fprintf(stderr, "          [ [i|o]key KEY ]\n");
  34         fprintf(stderr, "          [ dev PHYS_DEV ]\n");
  35         fprintf(stderr, "          [ fwmark MARK ]\n");
  36         fprintf(stderr, "\n");
  37         fprintf(stderr, "Where: NAME := STRING\n");
  38         fprintf(stderr, "       ADDR := { IPV6_ADDRESS }\n");
  39         fprintf(stderr, "       KEY  := { DOTTED_QUAD | NUMBER }\n");
  40         fprintf(stderr, "       MARK := { 0x0..0xffffffff }\n");
  41         exit(-1);
  42 }
  43
  44 static int vti6_parse_opt(struct link_util *lu, int argc, char **argv,
  45                           struct nlmsghdr *n)
  46 {
  47         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  48         struct {
  49                 struct nlmsghdr n;
  50                 struct ifinfomsg i;
  51         } req = {
  52                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  53                 .n.nlmsg_flags = NLM_F_REQUEST,
  54                 .n.nlmsg_type = RTM_GETLINK,
  55                 .i.ifi_family = preferred_family,
  56                 .i.ifi_index = ifi->ifi_index,
  57         };
  58         struct nlmsghdr *answer = NULL;
  59         struct rtattr *tb[IFLA_MAX + 1];
  60         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  61         struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
  62         struct in6_addr saddr = IN6ADDR_ANY_INIT;
  63         struct in6_addr daddr = IN6ADDR_ANY_INIT;
  64         __be32 ikey = 0;
  65         __be32 okey = 0;
  66         unsigned int link = 0;
  67         __u32 fwmark = 0;
  68         int len;
  69
  70         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  71                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
  72 get_failed:
  73                         fprintf(stderr,
  74                                 "Failed to get existing tunnel info.\n");
  75                         free(answer);
  76                         return -1;
  77                 }
  78
  79                 len = answer->nlmsg_len;
  80                 len -= NLMSG_LENGTH(sizeof(*ifi));
  81                 if (len < 0)
  82                         goto get_failed;
  83
  84                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
  85
  86                 if (!tb[IFLA_LINKINFO])
  87                         goto get_failed;
  88
  89                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
  90
  91                 if (!linkinfo[IFLA_INFO_DATA])
  92                         goto get_failed;
  93
  94                 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
  95                                     linkinfo[IFLA_INFO_DATA]);
  96
  97                 if (vtiinfo[IFLA_VTI_IKEY])
  98                         ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
  99
 100                 if (vtiinfo[IFLA_VTI_OKEY])
 101                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 102
 103                 if (vtiinfo[IFLA_VTI_LOCAL])
 104                         memcpy(&saddr, RTA_DATA(vtiinfo[IFLA_VTI_LOCAL]), sizeof(saddr));
 105
 106                 if (vtiinfo[IFLA_VTI_REMOTE])
 107                         memcpy(&daddr, RTA_DATA(vtiinfo[IFLA_VTI_REMOTE]), sizeof(daddr));
 108
 109                 if (vtiinfo[IFLA_VTI_LINK])
 110                         link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
 111
 112                 if (vtiinfo[IFLA_VTI_FWMARK])
 113                         fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]);
 114
 115                 free(answer);
 116         }
 117
 118         while (argc > 0) {
 119                 if (!matches(*argv, "key")) {
 120                         NEXT_ARG();
 121                         ikey = okey = tnl_parse_key("key", *argv);
 122                 } else if (!matches(*argv, "ikey")) {
 123                         NEXT_ARG();
 124                         ikey = tnl_parse_key("ikey", *argv);
 125                 } else if (!matches(*argv, "okey")) {
 126                         NEXT_ARG();
 127                         okey = tnl_parse_key("okey", *argv);
 128                 } else if (!matches(*argv, "remote")) {
 129                         inet_prefix addr;
 130
 131                         NEXT_ARG();
 132                         get_addr(&addr, *argv, AF_INET6);
 133                         memcpy(&daddr, addr.data, sizeof(daddr));
 134                 } else if (!matches(*argv, "local")) {
 135                         inet_prefix addr;
 136
 137                         NEXT_ARG();
 138                         get_addr(&addr, *argv, AF_INET6);
 139                         memcpy(&saddr, addr.data, sizeof(saddr));
 140                 } else if (!matches(*argv, "dev")) {
 141                         NEXT_ARG();
 142                         link = if_nametoindex(*argv);
 143                         if (link == 0)
 144                                 exit(-1);
 145                 } else if (strcmp(*argv, "fwmark") == 0) {
 146                         NEXT_ARG();
 147                         if (get_u32(&fwmark, *argv, 0))
 148                                 invarg("invalid fwmark\n", *argv);
 149                 } else
 150                         usage();
 151                 argc--; argv++;
 152         }
 153
 154         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 155         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 156
 157         if (memcmp(&saddr, &in6addr_any, sizeof(in6addr_any)))
 158             addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, sizeof(saddr));
 159         if (memcmp(&daddr, &in6addr_any, sizeof(in6addr_any)))
 160             addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, sizeof(daddr));
 161         addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
 162         if (link)
 163                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 164
 165         return 0;
 166 }
 167
 168 static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 169 {
 170         const char *local = "any";
 171         const char *remote = "any";
 172         struct in6_addr saddr;
 173         struct in6_addr daddr;
 174         unsigned int link;
 175         char s2[64];
 176
 177         if (!tb)
 178                 return;
 179
 180         if (tb[IFLA_VTI_REMOTE]) {
 181                 memcpy(&daddr, RTA_DATA(tb[IFLA_VTI_REMOTE]), sizeof(daddr));
 182
 183                 remote = format_host(AF_INET6, 16, &daddr);
 184         }
 185
 186         print_string(PRINT_ANY, "remote", "remote %s ", remote);
 187
 188         if (tb[IFLA_VTI_LOCAL]) {
 189                 memcpy(&saddr, RTA_DATA(tb[IFLA_VTI_LOCAL]), sizeof(saddr));
 190
 191                 local = format_host(AF_INET6, 16, &saddr);
 192         }
 193
 194         print_string(PRINT_ANY, "local", "local %s ", local);
 195
 196         if (tb[IFLA_VTI_LINK] && (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                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
 207                 print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 208         }
 209
 210         if (tb[IFLA_VTI_OKEY]) {
 211                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
 212                 print_string(PRINT_ANY, "okey", "okey %s ", s2);
 213         }
 214
 215         if (tb[IFLA_VTI_FWMARK]) {
 216                 __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
 217
 218                 if (fwmark) {
 219                         snprintf(s2, sizeof(s2), "0x%x", fwmark);
 220
 221                         print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
 222                 }
 223         }
 224 }
 225
 226 struct link_util vti6_link_util = {
 227         .id = "vti6",
 228         .maxattr = IFLA_VTI_MAX,
 229         .parse_opt = vti6_parse_opt,
 230         .print_opt = vti6_print_opt,
 231 };