src/vnet/ipsec/ipsec_spd_policy.c

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <vnet/ipsec/ipsec.h>
  17
  18 /**
  19  * @brief
  20  * Policy packet & bytes counters
  21  */
  22 vlib_combined_counter_main_t ipsec_spd_policy_counters = {
  23   .name = "policy",
  24   .stat_segment_name = "/net/ipsec/policy",
  25 };
  26
  27 static int
  28 ipsec_policy_is_equal (ipsec_policy_t * p1, ipsec_policy_t * p2)
  29 {
  30   if (p1->priority != p2->priority)
  31     return 0;
  32   if (p1->type != p2->type)
  33     return (0);
  34   if (p1->policy != p2->policy)
  35     return (0);
  36   if (p1->sa_id != p2->sa_id)
  37     return (0);
  38   if (p1->protocol != p2->protocol)
  39     return (0);
  40   if (p1->lport.start != p2->lport.start)
  41     return (0);
  42   if (p1->lport.stop != p2->lport.stop)
  43     return (0);
  44   if (p1->rport.start != p2->rport.start)
  45     return (0);
  46   if (p1->rport.stop != p2->rport.stop)
  47     return (0);
  48   if (p1->is_ipv6 != p2->is_ipv6)
  49     return (0);
  50   if (p2->is_ipv6)
  51     {
  52       if (p1->laddr.start.ip6.as_u64[0] != p2->laddr.start.ip6.as_u64[0])
  53         return (0);
  54       if (p1->laddr.start.ip6.as_u64[1] != p2->laddr.start.ip6.as_u64[1])
  55         return (0);
  56       if (p1->laddr.stop.ip6.as_u64[0] != p2->laddr.stop.ip6.as_u64[0])
  57         return (0);
  58       if (p1->laddr.stop.ip6.as_u64[1] != p2->laddr.stop.ip6.as_u64[1])
  59         return (0);
  60       if (p1->raddr.start.ip6.as_u64[0] != p2->raddr.start.ip6.as_u64[0])
  61         return (0);
  62       if (p1->raddr.start.ip6.as_u64[1] != p2->raddr.start.ip6.as_u64[1])
  63         return (0);
  64       if (p1->raddr.stop.ip6.as_u64[0] != p2->raddr.stop.ip6.as_u64[0])
  65         return (0);
  66       if (p1->laddr.stop.ip6.as_u64[1] != p2->laddr.stop.ip6.as_u64[1])
  67         return (0);
  68     }
  69   else
  70     {
  71       if (p1->laddr.start.ip4.as_u32 != p2->laddr.start.ip4.as_u32)
  72         return (0);
  73       if (p1->laddr.stop.ip4.as_u32 != p2->laddr.stop.ip4.as_u32)
  74         return (0);
  75       if (p1->raddr.start.ip4.as_u32 != p2->raddr.start.ip4.as_u32)
  76         return (0);
  77       if (p1->raddr.stop.ip4.as_u32 != p2->raddr.stop.ip4.as_u32)
  78         return (0);
  79     }
  80   return (1);
  81 }
  82
  83 static int
  84 ipsec_spd_entry_sort (void *a1, void *a2)
  85 {
  86   ipsec_main_t *im = &ipsec_main;
  87   u32 *id1 = a1;
  88   u32 *id2 = a2;
  89   ipsec_policy_t *p1, *p2;
  90
  91   p1 = pool_elt_at_index (im->policies, *id1);
  92   p2 = pool_elt_at_index (im->policies, *id2);
  93   if (p1 && p2)
  94     return p2->priority - p1->priority;
  95
  96   return 0;
  97 }
  98
  99 int
 100 ipsec_policy_mk_type (bool is_outbound,
 101                       bool is_ipv6,
 102                       ipsec_policy_action_t action,
 103                       ipsec_spd_policy_type_t * type)
 104 {
 105   if (is_outbound)
 106     {
 107       *type = (is_ipv6 ?
 108                IPSEC_SPD_POLICY_IP6_OUTBOUND : IPSEC_SPD_POLICY_IP4_OUTBOUND);
 109       return (0);
 110     }
 111   else
 112     {
 113       switch (action)
 114         {
 115         case IPSEC_POLICY_ACTION_PROTECT:
 116           *type = (is_ipv6 ?
 117                    IPSEC_SPD_POLICY_IP6_INBOUND_PROTECT :
 118                    IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT);
 119           return (0);
 120         case IPSEC_POLICY_ACTION_BYPASS:
 121           *type = (is_ipv6 ?
 122                    IPSEC_SPD_POLICY_IP6_INBOUND_BYPASS :
 123                    IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
 124           return (0);
 125         case IPSEC_POLICY_ACTION_DISCARD:
 126         case IPSEC_POLICY_ACTION_RESOLVE:
 127           break;
 128         }
 129     }
 130
 131   /* Unsupported type */
 132   return (-1);
 133 }
 134
 135 int
 136 ipsec_add_del_policy (vlib_main_t * vm,
 137                       ipsec_policy_t * policy, int is_add, u32 * stat_index)
 138 {
 139   ipsec_main_t *im = &ipsec_main;
 140   ipsec_spd_t *spd = 0;
 141   ipsec_policy_t *vp;
 142   u32 spd_index;
 143   uword *p;
 144
 145   p = hash_get (im->spd_index_by_spd_id, policy->id);
 146
 147   if (!p)
 148     return VNET_API_ERROR_SYSCALL_ERROR_1;
 149
 150   spd_index = p[0];
 151   spd = pool_elt_at_index (im->spds, spd_index);
 152   if (!spd)
 153     return VNET_API_ERROR_SYSCALL_ERROR_1;
 154
 155   if (is_add)
 156     {
 157       u32 policy_index;
 158
 159       if (policy->policy == IPSEC_POLICY_ACTION_PROTECT)
 160         {
 161           index_t sa_index = ipsec_sa_find_and_lock (policy->sa_id);
 162
 163           if (INDEX_INVALID == sa_index)
 164             return VNET_API_ERROR_SYSCALL_ERROR_1;
 165           policy->sa_index = sa_index;
 166         }
 167       else
 168         policy->sa_index = INDEX_INVALID;
 169
 170       pool_get (im->policies, vp);
 171       clib_memcpy (vp, policy, sizeof (*vp));
 172       policy_index = vp - im->policies;
 173
 174       vlib_validate_combined_counter (&ipsec_spd_policy_counters,
 175                                       policy_index);
 176       vlib_zero_combined_counter (&ipsec_spd_policy_counters, policy_index);
 177
 178       vec_add1 (spd->policies[policy->type], policy_index);
 179       vec_sort_with_function (spd->policies[policy->type],
 180                               ipsec_spd_entry_sort);
 181       *stat_index = policy_index;
 182     }
 183   else
 184     {
 185       u32 ii;
 186
 187       vec_foreach_index (ii, (spd->policies[policy->type]))
 188       {
 189         vp = pool_elt_at_index (im->policies,
 190                                 spd->policies[policy->type][ii]);
 191         if (ipsec_policy_is_equal (vp, policy))
 192           {
 193             vec_del1 (spd->policies[policy->type], ii);
 194             ipsec_sa_unlock (vp->sa_index);
 195             pool_put (im->policies, vp);
 196             break;
 197           }
 198       }
 199     }
 200
 201   return 0;
 202 }
 203
 204 /*
 205  * fd.io coding-style-patch-verification: ON
 206  *
 207  * Local Variables:
 208  * eval: (c-set-style "gnu")
 209  * End:
 210  */