nhrpd/nhrp_vc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* NHRP virtual connection
   3  * Copyright (c) 2014-2015 Timo Teräs
   4  */
   5
   6 #include "zebra.h"
   7 #include "memory.h"
   8 #include "stream.h"
   9 #include "hash.h"
  10 #include "thread.h"
  11 #include "jhash.h"
  12
  13 #include "nhrpd.h"
  14 #include "os.h"
  15
  16 DEFINE_MTYPE_STATIC(NHRPD, NHRP_VC, "NHRP virtual connection");
  17
  18 PREDECL_DLIST(childlist);
  19
  20 struct child_sa {
  21         uint32_t id;
  22         struct nhrp_vc *vc;
  23         struct childlist_item childlist_entry;
  24 };
  25
  26 DECLARE_DLIST(childlist, struct child_sa, childlist_entry);
  27
  28 static struct hash *nhrp_vc_hash;
  29 static struct childlist_head childlist_head[512];
  30
  31 static unsigned int nhrp_vc_key(const void *peer_data)
  32 {
  33         const struct nhrp_vc *vc = peer_data;
  34         return jhash_2words(sockunion_hash(&vc->local.nbma),
  35                             sockunion_hash(&vc->remote.nbma), 0);
  36 }
  37
  38 static bool nhrp_vc_cmp(const void *cache_data, const void *key_data)
  39 {
  40         const struct nhrp_vc *a = cache_data;
  41         const struct nhrp_vc *b = key_data;
  42
  43         return sockunion_same(&a->local.nbma, &b->local.nbma)
  44                && sockunion_same(&a->remote.nbma, &b->remote.nbma);
  45 }
  46
  47 static void *nhrp_vc_alloc(void *data)
  48 {
  49         struct nhrp_vc *vc, *key = data;
  50
  51         vc = XMALLOC(MTYPE_NHRP_VC, sizeof(struct nhrp_vc));
  52
  53         *vc = (struct nhrp_vc){
  54                 .local.nbma = key->local.nbma,
  55                 .remote.nbma = key->remote.nbma,
  56                 .notifier_list =
  57                 NOTIFIER_LIST_INITIALIZER(&vc->notifier_list),
  58         };
  59
  60         return vc;
  61 }
  62
  63 static void nhrp_vc_free(void *data)
  64 {
  65         XFREE(MTYPE_NHRP_VC, data);
  66 }
  67
  68 struct nhrp_vc *nhrp_vc_get(const union sockunion *src,
  69                             const union sockunion *dst, int create)
  70 {
  71         struct nhrp_vc key;
  72         key.local.nbma = *src;
  73         key.remote.nbma = *dst;
  74         return hash_get(nhrp_vc_hash, &key, create ? nhrp_vc_alloc : 0);
  75 }
  76
  77 static void nhrp_vc_check_delete(struct nhrp_vc *vc)
  78 {
  79         if (vc->updating || vc->ipsec || notifier_active(&vc->notifier_list))
  80                 return;
  81         hash_release(nhrp_vc_hash, vc);
  82         nhrp_vc_free(vc);
  83 }
  84
  85 static void nhrp_vc_update(struct nhrp_vc *vc, long cmd)
  86 {
  87         vc->updating = 1;
  88         notifier_call(&vc->notifier_list, cmd);
  89         vc->updating = 0;
  90         nhrp_vc_check_delete(vc);
  91 }
  92
  93 static void nhrp_vc_ipsec_reset(struct nhrp_vc *vc)
  94 {
  95         vc->local.id[0] = 0;
  96         vc->local.certlen = 0;
  97         vc->remote.id[0] = 0;
  98         vc->remote.certlen = 0;
  99 }
 100
 101 int nhrp_vc_ipsec_updown(uint32_t child_id, struct nhrp_vc *vc)
 102 {
 103         struct child_sa *sa = NULL, *lsa;
 104         uint32_t child_hash = child_id % array_size(childlist_head);
 105         int abort_migration = 0;
 106
 107         frr_each (childlist, &childlist_head[child_hash], lsa) {
 108                 if (lsa->id == child_id) {
 109                         sa = lsa;
 110                         break;
 111                 }
 112         }
 113
 114         if (!sa) {
 115                 if (!vc)
 116                         return 0;
 117
 118                 sa = XMALLOC(MTYPE_NHRP_VC, sizeof(struct child_sa));
 119
 120                 *sa = (struct child_sa){
 121                         .id = child_id,
 122                         .vc = NULL,
 123                 };
 124                 childlist_add_tail(&childlist_head[child_hash], sa);
 125         }
 126
 127         if (sa->vc == vc)
 128                 return 0;
 129
 130         if (vc) {
 131                 /* Attach first to new VC */
 132                 vc->ipsec++;
 133                 nhrp_vc_update(vc, NOTIFY_VC_IPSEC_CHANGED);
 134         }
 135         if (sa->vc && vc) {
 136                 /* Notify old VC of migration */
 137                 sa->vc->abort_migration = 0;
 138                 debugf(NHRP_DEBUG_COMMON, "IPsec NBMA change of %pSU to %pSU",
 139                        &sa->vc->remote.nbma, &vc->remote.nbma);
 140                 nhrp_vc_update(sa->vc, NOTIFY_VC_IPSEC_UPDATE_NBMA);
 141                 abort_migration = sa->vc->abort_migration;
 142         }
 143         if (sa->vc) {
 144                 /* Deattach old VC */
 145                 sa->vc->ipsec--;
 146                 if (!sa->vc->ipsec)
 147                         nhrp_vc_ipsec_reset(sa->vc);
 148                 nhrp_vc_update(sa->vc, NOTIFY_VC_IPSEC_CHANGED);
 149         }
 150
 151         /* Update */
 152         sa->vc = vc;
 153         if (!vc) {
 154                 childlist_del(&childlist_head[child_hash], sa);
 155                 XFREE(MTYPE_NHRP_VC, sa);
 156         }
 157
 158         return abort_migration;
 159 }
 160
 161 void nhrp_vc_notify_add(struct nhrp_vc *vc, struct notifier_block *n,
 162                         notifier_fn_t action)
 163 {
 164         notifier_add(n, &vc->notifier_list, action);
 165 }
 166
 167 void nhrp_vc_notify_del(struct nhrp_vc *vc, struct notifier_block *n)
 168 {
 169         notifier_del(n, &vc->notifier_list);
 170         nhrp_vc_check_delete(vc);
 171 }
 172
 173
 174 struct nhrp_vc_iterator_ctx {
 175         void (*cb)(struct nhrp_vc *, void *);
 176         void *ctx;
 177 };
 178
 179 static void nhrp_vc_iterator(struct hash_bucket *b, void *ctx)
 180 {
 181         struct nhrp_vc_iterator_ctx *ic = ctx;
 182         ic->cb(b->data, ic->ctx);
 183 }
 184
 185 void nhrp_vc_foreach(void (*cb)(struct nhrp_vc *, void *), void *ctx)
 186 {
 187         struct nhrp_vc_iterator_ctx ic = {
 188                 .cb = cb, .ctx = ctx,
 189         };
 190         hash_iterate(nhrp_vc_hash, nhrp_vc_iterator, &ic);
 191 }
 192
 193 void nhrp_vc_init(void)
 194 {
 195         size_t i;
 196
 197         nhrp_vc_hash = hash_create(nhrp_vc_key, nhrp_vc_cmp, "NHRP VC hash");
 198         for (i = 0; i < array_size(childlist_head); i++)
 199                 childlist_init(&childlist_head[i]);
 200 }
 201
 202 void nhrp_vc_reset(void)
 203 {
 204         struct child_sa *sa;
 205         size_t i;
 206
 207         for (i = 0; i < array_size(childlist_head); i++) {
 208                 frr_each_safe (childlist, &childlist_head[i], sa)
 209                         nhrp_vc_ipsec_updown(sa->id, 0);
 210         }
 211 }
 212
 213 void nhrp_vc_terminate(void)
 214 {
 215         nhrp_vc_reset();
 216         hash_clean(nhrp_vc_hash, nhrp_vc_free);
 217 }