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.vrf_id = VRF_DEFAULT;
  98         nh.type = NEXTHOP_TYPE_IPV4;
  99         nh.gate.ipv4.s_addr = routeEntry->ipRouteNextHop;
 100
 101         rib_add(AFI_IP, SAFI_UNICAST, VRF_DEFAULT, ZEBRA_ROUTE_KERNEL, 0,
 102                 zebra_flags, &prefix, NULL, &nh, 0, 0, 0, 0, 0);
 103 }
 104
 105 void route_read(struct zebra_ns *zns)
 106 {
 107         char storage[RT_BUFSIZ];
 108
 109         struct T_optmgmt_req *TLIreq = (struct T_optmgmt_req *)storage;
 110         struct T_optmgmt_ack *TLIack = (struct T_optmgmt_ack *)storage;
 111         struct T_error_ack *TLIerr = (struct T_error_ack *)storage;
 112
 113         struct opthdr *MIB2hdr;
 114
 115         mib2_ipRouteEntry_t *routeEntry, *lastRouteEntry;
 116
 117         struct strbuf msgdata;
 118         int flags, dev, retval, process;
 119
 120         if ((dev = open(_PATH_GETMSG_ROUTE, O_RDWR)) == -1) {
 121                 zlog_warn("can't open %s: %s", _PATH_GETMSG_ROUTE,
 122                           safe_strerror(errno));
 123                 return;
 124         }
 125
 126         TLIreq->PRIM_type = T_OPTMGMT_REQ;
 127         TLIreq->OPT_offset = sizeof(struct T_optmgmt_req);
 128         TLIreq->OPT_length = sizeof(struct opthdr);
 129         TLIreq->MGMT_flags = T_CURRENT;
 130
 131         MIB2hdr = (struct opthdr *)&TLIreq[1];
 132
 133         MIB2hdr->level = MIB2_IP;
 134         MIB2hdr->name = 0;
 135         MIB2hdr->len = 0;
 136
 137         msgdata.buf = storage;
 138         msgdata.len = sizeof(struct T_optmgmt_req) + sizeof(struct opthdr);
 139
 140         flags = 0;
 141
 142         if (putmsg(dev, &msgdata, NULL, flags) == -1) {
 143                 zlog_warn("putmsg failed: %s", safe_strerror(errno));
 144                 goto exit;
 145         }
 146
 147         MIB2hdr = (struct opthdr *)&TLIack[1];
 148         msgdata.maxlen = sizeof(storage);
 149
 150         while (1) {
 151                 flags = 0;
 152                 retval = getmsg(dev, &msgdata, NULL, &flags);
 153
 154                 if (retval == -1) {
 155                         zlog_warn("getmsg(ctl) failed: %s",
 156                                   safe_strerror(errno));
 157                         goto exit;
 158                 }
 159
 160                 /* This is normal loop termination */
 161                 if (retval == 0
 162                     && (size_t)msgdata.len >= sizeof(struct T_optmgmt_ack)
 163                     && TLIack->PRIM_type == T_OPTMGMT_ACK
 164                     && TLIack->MGMT_flags == T_SUCCESS && MIB2hdr->len == 0)
 165                         break;
 166
 167                 if ((size_t)msgdata.len >= sizeof(struct T_error_ack)
 168                     && TLIerr->PRIM_type == T_ERROR_ACK) {
 169                         zlog_warn("getmsg(ctl) returned T_ERROR_ACK: %s",
 170                                   safe_strerror((TLIerr->TLI_error == TSYSERR)
 171                                                         ? TLIerr->UNIX_error
 172                                                         : EPROTO));
 173                         break;
 174                 }
 175
 176                 /* should dump more debugging info to the log statement,
 177                    like what GateD does in this instance, but not
 178                    critical yet. */
 179                 if (retval != MOREDATA
 180                     || (size_t)msgdata.len < sizeof(struct T_optmgmt_ack)
 181                     || TLIack->PRIM_type != T_OPTMGMT_ACK
 182                     || TLIack->MGMT_flags != T_SUCCESS) {
 183                         errno = ENOMSG;
 184                         zlog_warn("getmsg(ctl) returned bizarreness");
 185                         break;
 186                 }
 187
 188                 /* MIB2_IP_21 is the the pseudo-MIB2 ipRouteTable
 189                    entry, see <inet/mib2.h>. "This isn't the MIB data
 190                    you're looking for." */
 191                 process = (MIB2hdr->level == MIB2_IP
 192                            && MIB2hdr->name == MIB2_IP_21)
 193                                   ? 1
 194                                   : 0;
 195
 196                 /* getmsg writes the data buffer out completely, not
 197                    to the closest smaller multiple. Unless reassembling
 198                    data structures across buffer boundaries is your idea
 199                    of a good time, set maxlen to the closest smaller
 200                    multiple of the size of the datastructure you're
 201                    retrieving. */
 202                 msgdata.maxlen =
 203                         sizeof(storage)
 204                         - (sizeof(storage) % sizeof(mib2_ipRouteEntry_t));
 205
 206                 msgdata.len = 0;
 207                 flags = 0;
 208
 209                 do {
 210                         retval = getmsg(dev, NULL, &msgdata, &flags);
 211
 212                         if (retval == -1) {
 213                                 zlog_warn("getmsg(data) failed: %s",
 214                                           safe_strerror(errno));
 215                                 goto exit;
 216                         }
 217
 218                         if (!(retval == 0 || retval == MOREDATA)) {
 219                                 zlog_warn("getmsg(data) returned %d", retval);
 220                                 goto exit;
 221                         }
 222
 223                         if (process) {
 224                                 if (msgdata.len % sizeof(mib2_ipRouteEntry_t)
 225                                     != 0) {
 226                                         zlog_warn(
 227                                                 "getmsg(data) returned "
 228                                                 "msgdata.len = %d (%% sizeof (mib2_ipRouteEntry_t) != 0)",
 229                                                 msgdata.len);
 230                                         goto exit;
 231                                 }
 232
 233                                 routeEntry = (mib2_ipRouteEntry_t *)msgdata.buf;
 234                                 lastRouteEntry =
 235                                         (mib2_ipRouteEntry_t *)(msgdata.buf
 236                                                                 + msgdata.len);
 237                                 do {
 238                                         handle_route_entry(routeEntry);
 239                                 } while (++routeEntry < lastRouteEntry);
 240                         }
 241                 } while (retval == MOREDATA);
 242         }
 243
 244 exit:
 245         close(dev);
 246 }
 247
 248 /* Only implemented for netlink method */
 249 void macfdb_read(struct zebra_ns *zns)
 250 {
 251 }
 252
 253 void macfdb_read_for_bridge(struct zebra_ns *zns, struct interface *ifp,
 254                             struct interface *br_if)
 255 {
 256 }
 257
 258 void neigh_read(struct zebra_ns *zns)
 259 {
 260 }
 261
 262 void neigh_read_for_vlan(struct zebra_ns *zns, struct interface *vlan_if)
 263 {
 264 }
 265
 266 void kernel_read_pbr_rules(struct zebra_ns *zns)
 267 {
 268 }
 269
 270 #endif /* SUNOS_5 */