summaryrefslogtreecommitdiffstats
path: root/src/vnet/ipsec/ipsec_output.h
blob: 63d97c0696ba081416b39e61207750a2b7fea058 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/*
 *------------------------------------------------------------------
 * Copyright (c) 2021 Intel and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *------------------------------------------------------------------
 */

#ifndef IPSEC_OUTPUT_H
#define IPSEC_OUTPUT_H

#include <vppinfra/types.h>
#include <vnet/ipsec/ipsec_spd.h>

always_inline void
ipsec4_out_spd_add_flow_cache_entry (ipsec_main_t *im, u8 pr, u32 la, u32 ra,
				     u16 lp, u16 rp, u32 pol_id)
{
  u64 hash;
  u8 overwrite = 0, stale_overwrite = 0;
  ipsec4_spd_5tuple_t ip4_5tuple = { .ip4_addr = { (ip4_address_t) la,
						   (ip4_address_t) ra },
				     .port = { lp, rp },
				     .proto = pr };

  ip4_5tuple.kv_16_8.value = (((u64) pol_id) << 32) | ((u64) im->epoch_count);

  hash = ipsec4_hash_16_8 (&ip4_5tuple.kv_16_8);
  hash &= (im->ipsec4_out_spd_hash_num_buckets - 1);

  ipsec_spinlock_lock (&im->ipsec4_out_spd_hash_tbl[hash].bucket_lock);
  /* Check if we are overwriting an existing entry so we know
  whether to increment the flow cache counter. Since flow
  cache counter is reset on any policy add/remove, but
  hash table values are not, we also need to check if the entry
  we are overwriting is stale or not. If it's a stale entry
  overwrite, we still want to increment flow cache counter */
  overwrite = (im->ipsec4_out_spd_hash_tbl[hash].value != 0);
  /* Check for stale entry by comparing with current epoch count */
  if (PREDICT_FALSE (overwrite))
    stale_overwrite =
      (im->epoch_count !=
       ((u32) (im->ipsec4_out_spd_hash_tbl[hash].value & 0xFFFFFFFF)));
  clib_memcpy_fast (&im->ipsec4_out_spd_hash_tbl[hash], &ip4_5tuple.kv_16_8,
		    sizeof (ip4_5tuple.kv_16_8));
  ipsec_spinlock_unlock (&im->ipsec4_out_spd_hash_tbl[hash].bucket_lock);

  /* Increment the counter to track active flow cache entries
    when entering a fresh entry or overwriting a stale one */
  if (!overwrite || stale_overwrite)
    clib_atomic_fetch_add_relax (&im->ipsec4_out_spd_flow_cache_entries, 1);

  return;
}

always_inline ipsec_policy_t *
ipsec4_out_spd_find_flow_cache_entry (ipsec_main_t *im, u8 pr, u32 la, u32 ra,
				      u16 lp, u16 rp)
{
  ipsec_policy_t *p = NULL;
  ipsec4_hash_kv_16_8_t kv_result;
  u64 hash;

  if (PREDICT_FALSE ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP) &&
		     (pr != IP_PROTOCOL_SCTP)))
    {
      lp = 0;
      rp = 0;
    }
  ipsec4_spd_5tuple_t ip4_5tuple = { .ip4_addr = { (ip4_address_t) la,
						   (ip4_address_t) ra },
				     .port = { lp, rp },
				     .proto = pr };

  hash = ipsec4_hash_16_8 (&ip4_5tuple.kv_16_8);
  hash &= (im->ipsec4_out_spd_hash_num_buckets - 1);

  ipsec_spinlock_lock (&im->ipsec4_out_spd_hash_tbl[hash].bucket_lock);
  kv_result = im->ipsec4_out_spd_hash_tbl[hash];
  ipsec_spinlock_unlock (&im->ipsec4_out_spd_hash_tbl[hash].bucket_lock);

  if (ipsec4_hash_key_compare_16_8 ((u64 *) &ip4_5tuple.kv_16_8,
				    (u64 *) &kv_result))
    {
      if (im->epoch_count == ((u32) (kv_result.value & 0xFFFFFFFF)))
	{
	  /* Get the policy based on the index */
	  p =
	    pool_elt_at_index (im->policies, ((u32) (kv_result.value >> 32)));
	}
    }

  return p;
}

always_inline ipsec_policy_t *
ipsec_output_policy_match (ipsec_spd_t *spd, u8 pr, u32 la, u32 ra, u16 lp,
			   u16 rp, u8 flow_cache_enabled)
{
  ipsec_main_t *im = &ipsec_main;
  ipsec_policy_t *p;
  u32 *i;

  if (!spd)
    return 0;

  vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP4_OUTBOUND])
    {
      p = pool_elt_at_index (im->policies, *i);
      if (PREDICT_FALSE ((p->protocol != IPSEC_POLICY_PROTOCOL_ANY) &&
			 (p->protocol != pr)))
	continue;

      if (ra < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
	continue;

      if (ra > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
	continue;

      if (la < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
	continue;

      if (la > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
	continue;

      if (PREDICT_FALSE ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP) &&
			 (pr != IP_PROTOCOL_SCTP)))
	{
	  lp = 0;
	  rp = 0;
	  goto add_flow_cache;
	}

      if (lp < p->lport.start)
	continue;

      if (lp > p->lport.stop)
	continue;

      if (rp < p->rport.start)
	continue;

      if (rp > p->rport.stop)
	continue;

    add_flow_cache:
      if (flow_cache_enabled)
	{
	  /* Add an Entry in Flow cache */
	  ipsec4_out_spd_add_flow_cache_entry (
	    im, pr, clib_host_to_net_u32 (la), clib_host_to_net_u32 (ra),
	    clib_host_to_net_u16 (lp), clib_host_to_net_u16 (rp), *i);
	}

      return p;
    }
  return 0;
}

#endif /* !IPSEC_OUTPUT_H */