ldp/ldp_entity.c

   1
   2 /*
   3  *  Copyright (C) James R. Leu 2000
   4  *  jleu@mindspring.com
   5  *
   6  *  This software is covered under the LGPL, for more
   7  *  info check out http://www.gnu.org/copyleft/lgpl.html
   8  */
   9
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <netinet/in.h>
  13 #include <stdio.h>
  14 #include "ldp_struct.h"
  15 #include "mpls_assert.h"
  16 #include "ldp_session.h"
  17 #include "ldp_global.h"
  18 #include "ldp_entity.h"
  19 #include "ldp_hello.h"
  20 #include "ldp_peer.h"
  21 #include "ldp_adj.h"
  22 #include "ldp_if.h"
  23 #include "ldp_inet_addr.h"
  24 #include "ldp_mesg.h"
  25 #include "ldp_cfg.h"
  26
  27 #include "mpls_mm_impl.h"
  28 #include "mpls_timer_impl.h"
  29 #include "mpls_socket_impl.h"
  30 #include "mpls_trace_impl.h"
  31
  32 static uint32_t _ldp_entity_next_index = 1;
  33
  34 void ldp_entity_set_defaults(ldp_entity *e) {
  35     memset(e, 0, sizeof(ldp_entity));
  36
  37     e->entity_type = LDP_UNKNOWN;
  38
  39     if (LDP_ENTITY_DEF_TRANS_ADDR != 0) {
  40       e->transport_address.type = MPLS_FAMILY_IPV4;
  41       e->transport_address.u.ipv4 = LDP_ENTITY_DEF_TRANS_ADDR;
  42     }
  43     e->protocol_version = LDP_ENTITY_DEF_PROTO_VER;
  44     e->remote_tcp_port = LDP_ENTITY_DEF_REMOTE_TCP;
  45     e->remote_udp_port = LDP_ENTITY_DEF_REMOTE_UDP;
  46     e->max_pdu = LDP_ENTITY_DEF_MAX_PDU;
  47     e->keepalive_timer = LDP_ENTITY_DEF_KEEPALIVE_TIMER;
  48     e->keepalive_interval = LDP_ENTITY_DEF_KEEPALIVE_INTERVAL;
  49     e->hellotime_timer = LDP_ENTITY_DEF_HELLOTIME_TIMER;
  50     e->hellotime_interval = LDP_ENTITY_DEF_HELLOTIME_INTERVAL;
  51     e->session_setup_count = LDP_ENTITY_DEF_SESSIONSETUP_COUNT;
  52     e->session_backoff_timer = LDP_ENTITY_DEF_SESSION_BACKOFF_TIMER;
  53     e->label_distribution_mode = LDP_ENTITY_DEF_DISTRIBUTION_MODE;
  54     e->path_vector_limit = LDP_ENTITY_DEF_PATHVECTOR_LIMIT;
  55     e->hop_count_limit = LDP_ENTITY_DEF_HOPCOUNT_LIMIT;
  56     e->label_request_timer = LDP_ENTITY_DEF_REQUEST_TIMER;
  57     e->label_request_count = LDP_ENTITY_DEF_REQUEST_COUNT;
  58     e->inherit_flag = LDP_ENTITY_DEF_INHERIT_FLAG;
  59     e->admin_state = MPLS_ADMIN_DISABLE;
  60     e->remote_in_ttl_less_domain = MPLS_BOOL_FALSE;
  61     e->request_retry = LDP_ENTITY_DEF_REQUEST_RETRY;
  62 }
  63
  64 ldp_entity *ldp_entity_create()
  65 {
  66   ldp_entity *e = (ldp_entity *) mpls_malloc(sizeof(ldp_entity));
  67
  68   if (e) {
  69     ldp_entity_set_defaults(e);
  70
  71     MPLS_REFCNT_INIT(e, 0);
  72     MPLS_LIST_INIT(&e->adj_root, ldp_adj);
  73     MPLS_LIST_ELEM_INIT(e, _global);
  74
  75     e->index = _ldp_entity_get_next_index();
  76   }
  77   return e;
  78 }
  79
  80 void ldp_entity_delete(ldp_entity * e)
  81 {
  82   fprintf(stderr,"entity delete\n");
  83   MPLS_REFCNT_ASSERT(e, 0);
  84   mpls_free(e);
  85 }
  86
  87 int ldp_entity_label_space(ldp_entity * e)
  88 {
  89   if (e) {
  90     switch (e->entity_type) {
  91       case LDP_DIRECT:
  92         return e->p.iff->label_space;
  93       case LDP_INDIRECT:
  94         return e->p.peer->label_space;
  95       default:
  96         MPLS_ASSERT(0);
  97     }
  98   }
  99   return -1;
 100 }
 101
 102 mpls_bool ldp_entity_is_active(ldp_entity * e)
 103 {
 104   if (e && e->admin_state == MPLS_ADMIN_ENABLE)
 105     return MPLS_BOOL_TRUE;
 106
 107   return MPLS_BOOL_FALSE;
 108 }
 109
 110 mpls_bool ldp_entity_is_ready(ldp_entity * e)
 111 {
 112   if (e) {
 113     switch (e->entity_type) {
 114       case LDP_DIRECT:
 115         if (e->p.iff)
 116           return MPLS_BOOL_TRUE;
 117         break;
 118       case LDP_INDIRECT:
 119         if (e->p.peer)
 120           return MPLS_BOOL_TRUE;
 121         break;
 122       default:
 123         MPLS_ASSERT(0);
 124     }
 125   }
 126   return MPLS_BOOL_FALSE;
 127 }
 128
 129 mpls_return_enum ldp_entity_startup(ldp_global * g, ldp_entity * e)
 130 {
 131   mpls_return_enum retval = MPLS_FAILURE;
 132
 133   MPLS_ASSERT(g && e && e->p.iff);
 134
 135   LDP_ENTER(g->user_data, "ldp_entity_startup");
 136
 137   if (e->inherit_flag & LDP_ENTITY_CFG_TRANS_ADDR) {
 138     memcpy(&e->transport_address,&g->transport_address,sizeof(mpls_inet_addr));
 139   }
 140   if (e->inherit_flag & LDP_ENTITY_CFG_KEEPALIVE_TIMER) {
 141     e->keepalive_timer = g->keepalive_timer;
 142   }
 143   if (e->inherit_flag & LDP_ENTITY_CFG_KEEPALIVE_INTERVAL) {
 144     e->keepalive_interval = g->keepalive_interval;
 145   }
 146   if (e->inherit_flag & LDP_ENTITY_CFG_HELLOTIME_TIMER) {
 147     e->hellotime_timer = g->hellotime_timer;
 148   }
 149   if (e->inherit_flag & LDP_ENTITY_CFG_HELLOTIME_INTERVAL) {
 150     e->hellotime_interval = g->hellotime_interval;
 151   }
 152
 153   e->loop_detection_mode = g->loop_detection_mode;
 154
 155   switch (e->entity_type) {
 156     case LDP_DIRECT:
 157       retval = ldp_if_startup(g, e->p.iff);
 158       break;
 159     case LDP_INDIRECT:
 160       retval = ldp_peer_startup(g, e->p.peer);
 161       break;
 162     default:
 163       MPLS_ASSERT(0);
 164   }
 165
 166   if (retval == MPLS_SUCCESS) {
 167     e->admin_state = MPLS_ADMIN_ENABLE;
 168   }
 169
 170   LDP_EXIT(g->user_data, "ldp_entity_startup");
 171
 172   return retval;
 173 }
 174
 175 mpls_return_enum ldp_entity_shutdown(ldp_global * g, ldp_entity * e, int flag)
 176 {
 177   ldp_adj *adj = NULL;
 178
 179   MPLS_ASSERT(g && e);
 180
 181   LDP_ENTER(g->user_data, "ldp_entity_shutdown");
 182
 183   /* flag is only set if the global entity is being disabled */
 184   if (!flag) {
 185     e->admin_state = MPLS_ADMIN_DISABLE;
 186   }
 187
 188   switch (e->entity_type) {
 189     case LDP_DIRECT:
 190       if (ldp_if_shutdown(g, e->p.iff) != MPLS_SUCCESS) {
 191         LDP_PRINT(g->user_data, "ldp_entity_shutdown: shut down of if failed\n");
 192       }
 193       break;
 194     case LDP_INDIRECT:
 195       if (ldp_peer_shutdown(g, e->p.peer) != MPLS_SUCCESS) {
 196         LDP_PRINT(g->user_data, "ldp_entity_shutdown: shut down of peer failed\n");
 197       }
 198       break;
 199     default:
 200       MPLS_ASSERT(0);
 201   }
 202
 203   while ((adj = MPLS_LIST_HEAD(&e->adj_root))) {
 204     /* ldp_adj_shutdown() does a ldp_entity_del_adj(e,adj) */
 205     ldp_adj_shutdown(g, adj);
 206   }
 207
 208   LDP_EXIT(g->user_data, "ldp_entity_shutdown");
 209
 210   return MPLS_SUCCESS;
 211 }
 212
 213 uint32_t _ldp_entity_get_next_index()
 214 {
 215   uint32_t retval = _ldp_entity_next_index;
 216
 217   _ldp_entity_next_index++;
 218   if (retval > _ldp_entity_next_index) {
 219     _ldp_entity_next_index = 1;
 220   }
 221   return retval;
 222 }
 223
 224 void ldp_entity_add_if(ldp_entity * e, ldp_if * i)
 225 {
 226   MPLS_ASSERT(e && i && e->entity_type == LDP_UNKNOWN);
 227
 228   e->entity_type = LDP_DIRECT;
 229   MPLS_REFCNT_HOLD(i);
 230   e->p.iff = i;
 231   e->sub_index = i->index;
 232   _ldp_if_add_entity(i, e);
 233 }
 234
 235 void ldp_entity_del_if(ldp_entity * e)
 236 {
 237   MPLS_ASSERT(e && e->entity_type == LDP_DIRECT && e->p.iff);
 238   _ldp_if_del_entity(e->p.iff);
 239   MPLS_REFCNT_RELEASE(e->p.iff, ldp_if_delete);
 240   e->p.iff = NULL;
 241   e->entity_type = LDP_UNKNOWN;
 242   e->sub_index = 0;
 243 }
 244
 245 void ldp_entity_add_peer(ldp_entity * e, ldp_peer * p)
 246 {
 247   MPLS_ASSERT(e && e->entity_type == LDP_UNKNOWN);
 248
 249   e->entity_type = LDP_INDIRECT;
 250   MPLS_REFCNT_HOLD(p);
 251   e->p.peer = p;
 252   e->sub_index = p->index;
 253   _ldp_peer_add_entity(p, e);
 254 }
 255
 256 void ldp_entity_del_peer(ldp_entity * e)
 257 {
 258   MPLS_ASSERT(e && e->entity_type == LDP_INDIRECT && e->p.peer);
 259   _ldp_peer_del_entity(e->p.peer);
 260   MPLS_REFCNT_RELEASE(e->p.peer, ldp_peer_delete);
 261   e->p.peer = NULL;
 262   e->entity_type = LDP_UNKNOWN;
 263   e->sub_index = 0;
 264 }
 265
 266 void ldp_entity_add_adj(ldp_entity * e, ldp_adj * a)
 267 {
 268   ldp_adj *ap = NULL;
 269
 270   MPLS_ASSERT(e && a);
 271   MPLS_REFCNT_HOLD(a);
 272
 273   _ldp_adj_add_entity(a, e);
 274   ap = MPLS_LIST_HEAD(&e->adj_root);
 275   while (ap) {
 276     if (ap->index > a->index) {
 277       MPLS_LIST_INSERT_BEFORE(&e->adj_root, ap, a, _entity);
 278       return;
 279     }
 280     ap = MPLS_LIST_NEXT(&e->adj_root, ap, _entity);
 281   }
 282   MPLS_LIST_ADD_TAIL(&e->adj_root, a, _entity, ldp_adj);
 283 }
 284
 285 void ldp_entity_del_adj(ldp_entity * e, ldp_adj * a)
 286 {
 287   MPLS_ASSERT(e && a);
 288   MPLS_LIST_REMOVE(&e->adj_root, a, _entity);
 289   _ldp_adj_del_entity(a, e);
 290   MPLS_REFCNT_RELEASE(a, ldp_adj_delete);
 291 }
 292
 293 ldp_adj *ldp_entity_find_adj(ldp_entity * e, ldp_mesg * msg)
 294 {
 295   ldp_adj *a = NULL;
 296   mpls_inet_addr lsraddr;
 297   int labelspace;
 298
 299   MPLS_ASSERT(e);
 300
 301   ldp_mesg_hdr_get_labelspace(msg, &labelspace);
 302   ldp_mesg_hdr_get_lsraddr(msg, &lsraddr);
 303
 304   a = MPLS_LIST_HEAD(&e->adj_root);
 305   while (a != NULL) {
 306     if (a->remote_label_space == labelspace &&
 307       (!mpls_inet_addr_compare(&lsraddr, &a->remote_lsr_address))) {
 308       return a;
 309     }
 310     a = MPLS_LIST_NEXT(&e->adj_root, a, _entity);
 311   }
 312
 313   return NULL;
 314 }