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                 "               [ local ADDR ]\n"
  33                 "               [ [i|o]key KEY ]\n"
  34                 "               [ dev PHYS_DEV ]\n"
  35                 "               [ fwmark MARK ]\n"
  36                 "\n"
  37                 "Where: ADDR := { IPV6_ADDRESS }\n"
  38                 "       KEY  := { DOTTED_QUAD | NUMBER }\n"
  39                 "       MARK := { 0x0..0xffffffff }\n",
  40                 lu->id);
  41 }
  42
  43 static int vti6_parse_opt(struct link_util *lu, int argc, char **argv,
  44                           struct nlmsghdr *n)
  45 {
  46         struct ifinfomsg *ifi = NLMSG_DATA(n);
  47         struct {
  48                 struct nlmsghdr n;
  49                 struct ifinfomsg i;
  50         } req = {
  51                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  52                 .n.nlmsg_flags = NLM_F_REQUEST,
  53                 .n.nlmsg_type = RTM_GETLINK,
  54                 .i.ifi_family = preferred_family,
  55                 .i.ifi_index = ifi->ifi_index,
  56         };
  57         struct nlmsghdr *answer;
  58         struct rtattr *tb[IFLA_MAX + 1];
  59         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  60         struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
  61         __be32 ikey = 0;
  62         __be32 okey = 0;
  63         inet_prefix saddr, daddr;
  64         unsigned int link = 0;
  65         __u32 fwmark = 0;
  66         int len;
  67
  68         inet_prefix_reset(&saddr);
  69         inet_prefix_reset(&daddr);
  70
  71         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  72                 const struct rtattr *rta;
  73
  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                 rta = vtiinfo[IFLA_VTI_LOCAL];
 100                 if (rta && get_addr_rta(&saddr, rta, AF_INET6))
 101                         goto get_failed;
 102
 103                 rta = vtiinfo[IFLA_VTI_REMOTE];
 104                 if (rta && get_addr_rta(&daddr, rta, AF_INET6))
 105                         goto get_failed;
 106
 107                 if (vtiinfo[IFLA_VTI_IKEY])
 108                         ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
 109
 110                 if (vtiinfo[IFLA_VTI_OKEY])
 111                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 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                         get_addr(&daddr, *argv, AF_INET6);
 135                 } else if (!matches(*argv, "local")) {
 136                         NEXT_ARG();
 137                         get_addr(&saddr, *argv, AF_INET6);
 138                 } else if (!matches(*argv, "dev")) {
 139                         NEXT_ARG();
 140                         link = ll_name_to_index(*argv);
 141                         if (!link)
 142                                 exit(nodev(*argv));
 143                 } else if (strcmp(*argv, "fwmark") == 0) {
 144                         NEXT_ARG();
 145                         if (get_u32(&fwmark, *argv, 0))
 146                                 invarg("invalid fwmark\n", *argv);
 147                 } else {
 148                         vti6_print_help(lu, argc, argv, stderr);
 149                         return -1;
 150                 }
 151                 argc--; argv++;
 152         }
 153
 154         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 155         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 156         if (is_addrtype_inet_not_unspec(&saddr))
 157                 addattr_l(n, 1024, IFLA_VTI_LOCAL, saddr.data, saddr.bytelen);
 158         if (is_addrtype_inet_not_unspec(&daddr))
 159                 addattr_l(n, 1024, IFLA_VTI_REMOTE, daddr.data, daddr.bytelen);
 160         addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
 161         if (link)
 162                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 163
 164         return 0;
 165 }
 166
 167 static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 168 {
 169         char s2[64];
 170
 171         if (!tb)
 172                 return;
 173
 174         tnl_print_endpoint("remote", tb[IFLA_VTI_REMOTE], AF_INET6);
 175         tnl_print_endpoint("local", tb[IFLA_VTI_LOCAL], AF_INET6);
 176
 177         if (tb[IFLA_VTI_LINK]) {
 178                 __u32 link = rta_getattr_u32(tb[IFLA_VTI_LINK]);
 179
 180                 if (link) {
 181                         print_string(PRINT_ANY, "link", "dev %s ",
 182                                      ll_index_to_name(link));
 183                 }
 184         }
 185
 186         if (tb[IFLA_VTI_IKEY]) {
 187                 struct rtattr *rta = tb[IFLA_VTI_IKEY];
 188                 __u32 key = rta_getattr_u32(rta);
 189
 190                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 191                         print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 192         }
 193
 194         if (tb[IFLA_VTI_OKEY]) {
 195                 struct rtattr *rta = tb[IFLA_VTI_OKEY];
 196                 __u32 key = rta_getattr_u32(rta);
 197
 198                 if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
 199                         print_string(PRINT_ANY, "okey", "okey %s ", s2);
 200         }
 201
 202         if (tb[IFLA_VTI_FWMARK]) {
 203                 __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
 204
 205                 if (fwmark) {
 206                         print_0xhex(PRINT_ANY,
 207                                     "fwmark", "fwmark %#llx ", fwmark);
 208                 }
 209         }
 210 }
 211
 212 struct link_util vti6_link_util = {
 213         .id = "vti6",
 214         .maxattr = IFLA_VTI_MAX,
 215         .parse_opt = vti6_parse_opt,
 216         .print_opt = vti6_print_opt,
 217         .print_help = vti6_print_help,
 218 };