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
  35 /* Thank you, Solaris, for polluting application symbol namespace. */
  36 #undef hook_register
  37 #undef hook_unregister
  38
  39 #include <sys/stream.h>
  40 #include <sys/tihdr.h>
  41
  42 /* Solaris defines these in both <netinet/in.h> and <inet/in.h>, sigh */
  43 #ifdef SUNOS_5
  44 #include <sys/tiuser.h>
  45 #ifndef T_CURRENT
  46 #define T_CURRENT       MI_T_CURRENT
  47 #endif /* T_CURRENT */
  48 #ifndef IRE_CACHE
  49 #define IRE_CACHE               0x0020  /* Cached Route entry */
  50 #endif /* IRE_CACHE */
  51 #ifndef IRE_HOST_REDIRECT
  52 #define IRE_HOST_REDIRECT       0x0200  /* Host route entry from redirects */
  53 #endif /* IRE_HOST_REDIRECT */
  54 #ifndef IRE_CACHETABLE
  55 #define IRE_CACHETABLE (IRE_CACHE | IRE_BROADCAST | IRE_LOCAL | IRE_LOOPBACK)
  56 #endif /* IRE_CACHETABLE */
  57 #undef IPOPT_EOL
  58 #undef IPOPT_NOP
  59 #undef IPOPT_LSRR
  60 #undef IPOPT_RR
  61 #undef IPOPT_SSRR
  62 #endif /* SUNOS_5 */
  63
  64 #include <inet/common.h>
  65 #include <inet/ip.h>
  66 #include <inet/mib2.h>
  67
  68 /* device to read IP routing table from */
  69 #ifndef _PATH_GETMSG_ROUTE
  70 #define _PATH_GETMSG_ROUTE      "/dev/ip"
  71 #endif /* _PATH_GETMSG_ROUTE */
  72
  73 #define RT_BUFSIZ               8192
  74
  75 static void handle_route_entry(mib2_ipRouteEntry_t *routeEntry)
  76 {
  77         struct prefix prefix;
  78         struct in_addr tmpaddr;
  79         struct nexthop nh;
  80         u_char zebra_flags = 0;
  81
  82         if (routeEntry->ipRouteInfo.re_ire_type & IRE_CACHETABLE)
  83                 return;
  84
  85         if (routeEntry->ipRouteInfo.re_ire_type & IRE_HOST_REDIRECT)
  86                 zebra_flags |= ZEBRA_FLAG_SELFROUTE;
  87
  88         prefix.family = AF_INET;
  89
  90         tmpaddr.s_addr = routeEntry->ipRouteDest;
  91         prefix.u.prefix4 = tmpaddr;
  92
  93         tmpaddr.s_addr = routeEntry->ipRouteMask;
  94         prefix.prefixlen = ip_masklen(tmpaddr);
  95
  96         memset(&nh, 0, sizeof(nh));
  97         nh.type = NEXTHOP_TYPE_IPV4;
  98         nh.gate.ipv4.s_addr = routeEntry->ipRouteNextHop;
  99
 100         rib_add(AFI_IP, SAFI_UNICAST, VRF_DEFAULT, ZEBRA_ROUTE_KERNEL, 0,
 101                 zebra_flags, &prefix, NULL, &nh, 0, 0, 0, 0);
 102 }
 103
 104 void route_read(struct zebra_ns *zns)
 105 {
 106         char storage[RT_BUFSIZ];
 107
 108         struct T_optmgmt_req *TLIreq = (struct T_optmgmt_req *)storage;
 109         struct T_optmgmt_ack *TLIack = (struct T_optmgmt_ack *)storage;
 110         struct T_error_ack *TLIerr = (struct T_error_ack *)storage;
 111
 112         struct opthdr *MIB2hdr;
 113
 114         mib2_ipRouteEntry_t *routeEntry, *lastRouteEntry;
 115
 116         struct strbuf msgdata;
 117         int flags, dev, retval, process;
 118
 119         if ((dev = open(_PATH_GETMSG_ROUTE, O_RDWR)) == -1) {
 120                 zlog_warn("can't open %s: %s", _PATH_GETMSG_ROUTE,
 121                           safe_strerror(errno));
 122                 return;
 123         }
 124
 125         TLIreq->PRIM_type = T_OPTMGMT_REQ;
 126         TLIreq->OPT_offset = sizeof(struct T_optmgmt_req);
 127         TLIreq->OPT_length = sizeof(struct opthdr);
 128         TLIreq->MGMT_flags = T_CURRENT;
 129
 130         MIB2hdr = (struct opthdr *)&TLIreq[1];
 131
 132         MIB2hdr->level = MIB2_IP;
 133         MIB2hdr->name = 0;
 134         MIB2hdr->len = 0;
 135
 136         msgdata.buf = storage;
 137         msgdata.len = sizeof(struct T_optmgmt_req) + sizeof(struct opthdr);
 138
 139         flags = 0;
 140
 141         if (putmsg(dev, &msgdata, NULL, flags) == -1) {
 142                 zlog_warn("putmsg failed: %s", safe_strerror(errno));
 143                 goto exit;
 144         }
 145
 146         MIB2hdr = (struct opthdr *)&TLIack[1];
 147         msgdata.maxlen = sizeof(storage);
 148
 149         while (1) {
 150                 flags = 0;
 151                 retval = getmsg(dev, &msgdata, NULL, &flags);
 152
 153                 if (retval == -1) {
 154                         zlog_warn("getmsg(ctl) failed: %s",
 155                                   safe_strerror(errno));
 156                         goto exit;
 157                 }
 158
 159                 /* This is normal loop termination */
 160                 if (retval == 0
 161                     && (size_t)msgdata.len >= sizeof(struct T_optmgmt_ack)
 162                     && TLIack->PRIM_type == T_OPTMGMT_ACK
 163                     && TLIack->MGMT_flags == T_SUCCESS && MIB2hdr->len == 0)
 164                         break;
 165
 166                 if ((size_t)msgdata.len >= sizeof(struct T_error_ack)
 167                     && TLIerr->PRIM_type == T_ERROR_ACK) {
 168                         zlog_warn("getmsg(ctl) returned T_ERROR_ACK: %s",
 169                                   safe_strerror((TLIerr->TLI_error == TSYSERR)
 170                                                         ? TLIerr->UNIX_error
 171                                                         : EPROTO));
 172                         break;
 173                 }
 174
 175                 /* should dump more debugging info to the log statement,
 176                    like what GateD does in this instance, but not
 177                    critical yet. */
 178                 if (retval != MOREDATA
 179                     || (size_t)msgdata.len < sizeof(struct T_optmgmt_ack)
 180                     || TLIack->PRIM_type != T_OPTMGMT_ACK
 181                     || TLIack->MGMT_flags != T_SUCCESS) {
 182                         errno = ENOMSG;
 183                         zlog_warn("getmsg(ctl) returned bizarreness");
 184                         break;
 185                 }
 186
 187                 /* MIB2_IP_21 is the the pseudo-MIB2 ipRouteTable
 188                    entry, see <inet/mib2.h>. "This isn't the MIB data
 189                    you're looking for." */
 190                 process = (MIB2hdr->level == MIB2_IP
 191                            && MIB2hdr->name == MIB2_IP_21)
 192                                   ? 1
 193                                   : 0;
 194
 195                 /* getmsg writes the data buffer out completely, not
 196                    to the closest smaller multiple. Unless reassembling
 197                    data structures across buffer boundaries is your idea
 198                    of a good time, set maxlen to the closest smaller
 199                    multiple of the size of the datastructure you're
 200                    retrieving. */
 201                 msgdata.maxlen =
 202                         sizeof(storage)
 203                         - (sizeof(storage) % sizeof(mib2_ipRouteEntry_t));
 204
 205                 msgdata.len = 0;
 206                 flags = 0;
 207
 208                 do {
 209                         retval = getmsg(dev, NULL, &msgdata, &flags);
 210
 211                         if (retval == -1) {
 212                                 zlog_warn("getmsg(data) failed: %s",
 213                                           safe_strerror(errno));
 214                                 goto exit;
 215                         }
 216
 217                         if (!(retval == 0 || retval == MOREDATA)) {
 218                                 zlog_warn("getmsg(data) returned %d", retval);
 219                                 goto exit;
 220                         }
 221
 222                         if (process) {
 223                                 if (msgdata.len % sizeof(mib2_ipRouteEntry_t)
 224                                     != 0) {
 225                                         zlog_warn(
 226                                                 "getmsg(data) returned "
 227                                                 "msgdata.len = %d (%% sizeof (mib2_ipRouteEntry_t) != 0)",
 228                                                 msgdata.len);
 229                                         goto exit;
 230                                 }
 231
 232                                 routeEntry = (mib2_ipRouteEntry_t *)msgdata.buf;
 233                                 lastRouteEntry =
 234                                         (mib2_ipRouteEntry_t *)(msgdata.buf
 235                                                                 + msgdata.len);
 236                                 do {
 237                                         handle_route_entry(routeEntry);
 238                                 } while (++routeEntry < lastRouteEntry);
 239                         }
 240                 } while (retval == MOREDATA);
 241         }
 242
 243 exit:
 244         close(dev);
 245 }
 246
 247 /* Only implemented for netlink method */
 248 void macfdb_read(struct zebra_ns *zns)
 249 {
 250 }
 251
 252 void macfdb_read_for_bridge(struct zebra_ns *zns, struct interface *ifp,
 253                             struct interface *br_if)
 254 {
 255 }
 256
 257 void neigh_read(struct zebra_ns *zns)
 258 {
 259 }
 260
 261 void neigh_read_for_vlan(struct zebra_ns *zns, struct interface *vlan_if)
 262 {
 263 }
 264
 265 #endif /* SUNOS_5 */