zebra/rtread_getmsg.c

   1 /*
   2  * Kernel routing table readup by getmsg(2)
   3  * Copyright (C) 1999 Michael Handler
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; see the file COPYING; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <zebra.h>
  23
  24 #ifdef SUNOS_5
  25
  26 #include "prefix.h"
  27 #include "log.h"
  28 #include "if.h"
  29 #include "vrf.h"
  30 #include "vty.h"
  31
  32 #include "zebra/rib.h"
  33 #include "zebra/rt.h"
  34 #include "zebra/zebra_pbr.h"
  35
  36 /* Thank you, Solaris, for polluting application symbol namespace. */
  37 #undef hook_register
  38 #undef hook_unregister
  39
  40 #include <sys/stream.h>
  41 #include <sys/tihdr.h>
  42
  43 /* Solaris defines these in both <netinet/in.h> and <inet/in.h>, sigh */
  44 #ifdef SUNOS_5
  45 #include <sys/tiuser.h>
  46 #ifndef T_CURRENT
  47 #define T_CURRENT       MI_T_CURRENT
  48 #endif /* T_CURRENT */
  49 #ifndef IRE_CACHE
  50 #define IRE_CACHE               0x0020  /* Cached Route entry */
  51 #endif /* IRE_CACHE */
  52 #ifndef IRE_HOST_REDIRECT
  53 #define IRE_HOST_REDIRECT       0x0200  /* Host route entry from redirects */
  54 #endif /* IRE_HOST_REDIRECT */
  55 #ifndef IRE_CACHETABLE
  56 #define IRE_CACHETABLE (IRE_CACHE | IRE_BROADCAST | IRE_LOCAL | IRE_LOOPBACK)
  57 #endif /* IRE_CACHETABLE */
  58 #undef IPOPT_EOL
  59 #undef IPOPT_NOP
  60 #undef IPOPT_LSRR
  61 #undef IPOPT_RR
  62 #undef IPOPT_SSRR
  63 #endif /* SUNOS_5 */
  64
  65 #include <inet/common.h>
  66 #include <inet/ip.h>
  67 #include <inet/mib2.h>
  68
  69 /* device to read IP routing table from */
  70 #ifndef _PATH_GETMSG_ROUTE
  71 #define _PATH_GETMSG_ROUTE      "/dev/ip"
  72 #endif /* _PATH_GETMSG_ROUTE */
  73
  74 #define RT_BUFSIZ               8192
  75
  76 static void handle_route_entry(mib2_ipRouteEntry_t *routeEntry)
  77 {
  78         struct prefix prefix;
  79         struct in_addr tmpaddr;
  80         struct nexthop nh;
  81         uint8_t zebra_flags = 0;
  82
  83         if (routeEntry->ipRouteInfo.re_ire_type & IRE_CACHETABLE)
  84                 return;
  85
  86         if (routeEntry->ipRouteInfo.re_ire_type & IRE_HOST_REDIRECT)
  87                 zebra_flags |= ZEBRA_FLAG_SELFROUTE;
  88
  89         prefix.family = AF_INET;
  90
  91         tmpaddr.s_addr = routeEntry->ipRouteDest;
  92         prefix.u.prefix4 = tmpaddr;
  93
  94         tmpaddr.s_addr = routeEntry->ipRouteMask;
  95         prefix.prefixlen = ip_masklen(tmpaddr);
  96
  97         memset(&nh, 0, sizeof(nh));
  98         nh.vrf_id = VRF_DEFAULT;
  99         nh.type = NEXTHOP_TYPE_IPV4;
 100         nh.gate.ipv4.s_addr = routeEntry->ipRouteNextHop;
 101
 102         rib_add(AFI_IP, SAFI_UNICAST, VRF_DEFAULT, ZEBRA_ROUTE_KERNEL, 0,
 103                 zebra_flags, &prefix, NULL, &nh, 0, 0, 0, 0, 0);
 104 }
 105
 106 void route_read(struct zebra_ns *zns)
 107 {
 108         char storage[RT_BUFSIZ];
 109
 110         struct T_optmgmt_req *TLIreq = (struct T_optmgmt_req *)storage;
 111         struct T_optmgmt_ack *TLIack = (struct T_optmgmt_ack *)storage;
 112         struct T_error_ack *TLIerr = (struct T_error_ack *)storage;
 113
 114         struct opthdr *MIB2hdr;
 115
 116         mib2_ipRouteEntry_t *routeEntry, *lastRouteEntry;
 117
 118         struct strbuf msgdata;
 119         int flags, dev, retval, process;
 120
 121         if ((dev = open(_PATH_GETMSG_ROUTE, O_RDWR)) == -1) {
 122                 zlog_warn("can't open %s: %s", _PATH_GETMSG_ROUTE,
 123                           safe_strerror(errno));
 124                 return;
 125         }
 126
 127         TLIreq->PRIM_type = T_OPTMGMT_REQ;
 128         TLIreq->OPT_offset = sizeof(struct T_optmgmt_req);
 129         TLIreq->OPT_length = sizeof(struct opthdr);
 130         TLIreq->MGMT_flags = T_CURRENT;
 131
 132         MIB2hdr = (struct opthdr *)&TLIreq[1];
 133
 134         MIB2hdr->level = MIB2_IP;
 135         MIB2hdr->name = 0;
 136         MIB2hdr->len = 0;
 137
 138         msgdata.buf = storage;
 139         msgdata.len = sizeof(struct T_optmgmt_req) + sizeof(struct opthdr);
 140
 141         flags = 0;
 142
 143         if (putmsg(dev, &msgdata, NULL, flags) == -1) {
 144                 zlog_warn("putmsg failed: %s", safe_strerror(errno));
 145                 goto exit;
 146         }
 147
 148         MIB2hdr = (struct opthdr *)&TLIack[1];
 149         msgdata.maxlen = sizeof(storage);
 150
 151         while (1) {
 152                 flags = 0;
 153                 retval = getmsg(dev, &msgdata, NULL, &flags);
 154
 155                 if (retval == -1) {
 156                         zlog_warn("getmsg(ctl) failed: %s",
 157                                   safe_strerror(errno));
 158                         goto exit;
 159                 }
 160
 161                 /* This is normal loop termination */
 162                 if (retval == 0
 163                     && (size_t)msgdata.len >= sizeof(struct T_optmgmt_ack)
 164                     && TLIack->PRIM_type == T_OPTMGMT_ACK
 165                     && TLIack->MGMT_flags == T_SUCCESS && MIB2hdr->len == 0)
 166                         break;
 167
 168                 if ((size_t)msgdata.len >= sizeof(struct T_error_ack)
 169                     && TLIerr->PRIM_type == T_ERROR_ACK) {
 170                         zlog_warn("getmsg(ctl) returned T_ERROR_ACK: %s",
 171                                   safe_strerror((TLIerr->TLI_error == TSYSERR)
 172                                                         ? TLIerr->UNIX_error
 173                                                         : EPROTO));
 174                         break;
 175                 }
 176
 177                 /* should dump more debugging info to the log statement,
 178                    like what GateD does in this instance, but not
 179                    critical yet. */
 180                 if (retval != MOREDATA
 181                     || (size_t)msgdata.len < sizeof(struct T_optmgmt_ack)
 182                     || TLIack->PRIM_type != T_OPTMGMT_ACK
 183                     || TLIack->MGMT_flags != T_SUCCESS) {
 184                         errno = ENOMSG;
 185                         zlog_warn("getmsg(ctl) returned bizarreness");
 186                         break;
 187                 }
 188
 189                 /* MIB2_IP_21 is the the pseudo-MIB2 ipRouteTable
 190                    entry, see <inet/mib2.h>. "This isn't the MIB data
 191                    you're looking for." */
 192                 process = (MIB2hdr->level == MIB2_IP
 193                            && MIB2hdr->name == MIB2_IP_21)
 194                                   ? 1
 195                                   : 0;
 196
 197                 /* getmsg writes the data buffer out completely, not
 198                    to the closest smaller multiple. Unless reassembling
 199                    data structures across buffer boundaries is your idea
 200                    of a good time, set maxlen to the closest smaller
 201                    multiple of the size of the datastructure you're
 202                    retrieving. */
 203                 msgdata.maxlen =
 204                         sizeof(storage)
 205                         - (sizeof(storage) % sizeof(mib2_ipRouteEntry_t));
 206
 207                 msgdata.len = 0;
 208                 flags = 0;
 209
 210                 do {
 211                         retval = getmsg(dev, NULL, &msgdata, &flags);
 212
 213                         if (retval == -1) {
 214                                 zlog_warn("getmsg(data) failed: %s",
 215                                           safe_strerror(errno));
 216                                 goto exit;
 217                         }
 218
 219                         if (!(retval == 0 || retval == MOREDATA)) {
 220                                 zlog_warn("getmsg(data) returned %d", retval);
 221                                 goto exit;
 222                         }
 223
 224                         if (process) {
 225                                 if (msgdata.len % sizeof(mib2_ipRouteEntry_t)
 226                                     != 0) {
 227                                         zlog_warn(
 228                                                 "getmsg(data) returned "
 229                                                 "msgdata.len = %d (%% sizeof (mib2_ipRouteEntry_t) != 0)",
 230                                                 msgdata.len);
 231                                         goto exit;
 232                                 }
 233
 234                                 routeEntry = (mib2_ipRouteEntry_t *)msgdata.buf;
 235                                 lastRouteEntry =
 236                                         (mib2_ipRouteEntry_t *)(msgdata.buf
 237                                                                 + msgdata.len);
 238                                 do {
 239                                         handle_route_entry(routeEntry);
 240                                 } while (++routeEntry < lastRouteEntry);
 241                         }
 242                 } while (retval == MOREDATA);
 243         }
 244
 245 exit:
 246         close(dev);
 247 }
 248
 249 /* Only implemented for netlink method */
 250 void macfdb_read(struct zebra_ns *zns)
 251 {
 252 }
 253
 254 void macfdb_read_for_bridge(struct zebra_ns *zns, struct interface *ifp,
 255                             struct interface *br_if)
 256 {
 257 }
 258
 259 void neigh_read(struct zebra_ns *zns)
 260 {
 261 }
 262
 263 void neigh_read_for_vlan(struct zebra_ns *zns, struct interface *vlan_if)
 264 {
 265 }
 266
 267 void kernel_read_pbr_rules(struct zebra_ns *zns)
 268 {
 269 }
 270
 271 #endif /* SUNOS_5 */