ctdb/server/ipalloc.c

   1 /*
   2    ctdb ip takeover code
   3
   4    Copyright (C) Ronnie Sahlberg  2007
   5    Copyright (C) Andrew Tridgell  2007
   6    Copyright (C) Martin Schwenke  2011
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include <talloc.h>
  23
  24 #include "replace.h"
  25 #include "system/network.h"
  26
  27 #include "lib/util/debug.h"
  28
  29 #include "common/logging.h"
  30 #include "common/rb_tree.h"
  31
  32 #include "server/ipalloc_private.h"
  33
  34 static void *add_ip_callback(void *parm, void *data)
  35 {
  36         struct public_ip_list *this_ip = parm;
  37         struct public_ip_list *prev_ip = data;
  38
  39         if (prev_ip == NULL) {
  40                 return parm;
  41         }
  42         if (this_ip->pnn == -1) {
  43                 this_ip->pnn = prev_ip->pnn;
  44         }
  45
  46         return parm;
  47 }
  48
  49 static int getips_count_callback(void *param, void *data)
  50 {
  51         struct public_ip_list **ip_list = (struct public_ip_list **)param;
  52         struct public_ip_list *new_ip = (struct public_ip_list *)data;
  53
  54         new_ip->next = *ip_list;
  55         *ip_list     = new_ip;
  56         return 0;
  57 }
  58
  59 /* Nodes only know about those public addresses that they are
  60  * configured to serve and no individual node has a full list of all
  61  * public addresses configured across the cluster.  Therefore, a
  62  * merged list of all public addresses needs to be built so that IP
  63  * allocation can be done. */
  64 static struct public_ip_list *
  65 create_merged_ip_list(struct ipalloc_state *ipalloc_state)
  66 {
  67         int i, j;
  68         struct public_ip_list *ip_list;
  69         struct ctdb_public_ip_list *public_ips;
  70         struct trbt_tree *ip_tree;
  71
  72         ip_tree = trbt_create(ipalloc_state, 0);
  73
  74         if (ipalloc_state->known_public_ips == NULL) {
  75                 DEBUG(DEBUG_ERR, ("Known public IPs not set\n"));
  76                 return NULL;
  77         }
  78
  79         for (i=0; i < ipalloc_state->num; i++) {
  80
  81                 public_ips = &ipalloc_state->known_public_ips[i];
  82
  83                 for (j=0; j < public_ips->num; j++) {
  84                         struct public_ip_list *tmp_ip;
  85
  86                         /* This is returned as part of ip_list */
  87                         tmp_ip = talloc_zero(ipalloc_state, struct public_ip_list);
  88                         if (tmp_ip == NULL) {
  89                                 DEBUG(DEBUG_ERR,
  90                                       (__location__ " out of memory\n"));
  91                                 talloc_free(ip_tree);
  92                                 return NULL;
  93                         }
  94
  95                         /* Do not use information about IP addresses hosted
  96                          * on other nodes, it may not be accurate */
  97                         if (public_ips->ip[j].pnn == i) {
  98                                 tmp_ip->pnn = public_ips->ip[j].pnn;
  99                         } else {
 100                                 tmp_ip->pnn = -1;
 101                         }
 102                         tmp_ip->addr = public_ips->ip[j].addr;
 103                         tmp_ip->next = NULL;
 104
 105                         trbt_insertarray32_callback(ip_tree,
 106                                 IP_KEYLEN, ip_key(&public_ips->ip[j].addr),
 107                                 add_ip_callback,
 108                                 tmp_ip);
 109                 }
 110         }
 111
 112         ip_list = NULL;
 113         trbt_traversearray32(ip_tree, IP_KEYLEN, getips_count_callback, &ip_list);
 114         talloc_free(ip_tree);
 115
 116         return ip_list;
 117 }
 118
 119 bool ipalloc_set_public_ips(struct ipalloc_state *ipalloc_state,
 120                             struct ctdb_public_ip_list *known_ips,
 121                             struct ctdb_public_ip_list *available_ips)
 122 {
 123         ipalloc_state->known_public_ips = known_ips;
 124         ipalloc_state->available_public_ips = available_ips;
 125
 126         ipalloc_state->all_ips = create_merged_ip_list(ipalloc_state);
 127
 128         return (ipalloc_state->all_ips != NULL);
 129 }
 130
 131 /* The calculation part of the IP allocation algorithm. */
 132 bool ipalloc(struct ipalloc_state *ipalloc_state)
 133 {
 134         bool ret = false;
 135
 136         switch (ipalloc_state->algorithm) {
 137         case IPALLOC_LCP2:
 138                 ret = ipalloc_lcp2(ipalloc_state);
 139                 break;
 140         case IPALLOC_DETERMINISTIC:
 141                 ret = ipalloc_deterministic(ipalloc_state);
 142                 break;
 143         case IPALLOC_NONDETERMINISTIC:
 144                 ret = ipalloc_nondeterministic(ipalloc_state);
 145                break;
 146         }
 147
 148         /* at this point ->pnn is the node which will own each IP
 149            or -1 if there is no node that can cover this ip
 150         */
 151
 152         return ret;
 153 }