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