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/*
* Copyright (c) 2020 Cisco 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 included_ip_vtep_h
#define included_ip_vtep_h
#include <vppinfra/hash.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip46_address.h>
/**
* @brief Tunnel endpoint key (IPv4)
*
* Tunnel modules maintain a set of vtep4_key_t-s to track local IP
* addresses that have tunnels established. Bypass node consults the
* corresponding set to decide whether a packet should bypass normal
* processing and go directly to the tunnel protocol handler node.
*/
typedef CLIB_PACKED
(struct {
union {
struct {
ip4_address_t addr;
u32 fib_index;
};
u64 as_u64;
};
}) vtep4_key_t;
/**
* @brief Tunnel endpoint key (IPv6)
*
* Tunnel modules maintain a set of vtep6_key_t-s to track local IP
* addresses that have tunnels established. Bypass node consults the
* corresponding set to decide whether a packet should bypass normal
* processing and go directly to the tunnel protocol handler node.
*/
typedef CLIB_PACKED
(struct {
ip6_address_t addr;
u32 fib_index;
}) vtep6_key_t;
typedef struct
{
uword *vtep4; /* local ip4 VTEPs keyed on their ip4 addr + fib_index */
uword *vtep6; /* local ip6 VTEPs keyed on their ip6 addr + fib_index */
} vtep_table_t;
always_inline vtep_table_t
vtep_table_create ()
{
vtep_table_t t = { };
t.vtep6 = hash_create_mem (0, sizeof (vtep6_key_t), sizeof (uword));
return t;
}
uword vtep_addr_ref (vtep_table_t * t, u32 fib_index, ip46_address_t * ip);
uword vtep_addr_unref (vtep_table_t * t, u32 fib_index, ip46_address_t * ip);
always_inline void
vtep4_key_init (vtep4_key_t * k4)
{
k4->as_u64 = ~((u64) 0);
}
always_inline void
vtep6_key_init (vtep6_key_t * k6)
{
ip6_address_set_zero (&k6->addr);
k6->fib_index = (u32) ~ 0;
}
enum
{
VTEP_CHECK_FAIL = 0,
VTEP_CHECK_PASS = 1,
VTEP_CHECK_PASS_UNCHANGED = 2
};
always_inline u8
vtep4_check (vtep_table_t * t, vlib_buffer_t * b0, ip4_header_t * ip40,
vtep4_key_t * last_k4)
{
vtep4_key_t k4;
k4.addr.as_u32 = ip40->dst_address.as_u32;
k4.fib_index = vlib_buffer_get_ip4_fib_index (b0);
if (PREDICT_TRUE (k4.as_u64 == last_k4->as_u64))
return VTEP_CHECK_PASS_UNCHANGED;
if (PREDICT_FALSE (!hash_get (t->vtep4, k4.as_u64)))
return VTEP_CHECK_FAIL;
last_k4->as_u64 = k4.as_u64;
return VTEP_CHECK_PASS;
}
typedef struct
{
vtep4_key_t vtep4_cache[8];
int idx;
} vtep4_cache_t;
#ifdef CLIB_HAVE_VEC512
always_inline u8
vtep4_check_vector (vtep_table_t * t, vlib_buffer_t * b0, ip4_header_t * ip40,
vtep4_key_t * last_k4, vtep4_cache_t * vtep4_u512)
{
vtep4_key_t k4;
k4.addr.as_u32 = ip40->dst_address.as_u32;
k4.fib_index = vlib_buffer_get_ip4_fib_index (b0);
if (PREDICT_TRUE (k4.as_u64 == last_k4->as_u64))
return VTEP_CHECK_PASS_UNCHANGED;
u64x8 k4_u64x8 = u64x8_splat (k4.as_u64);
u64x8 cache = u64x8_load_unaligned (vtep4_u512->vtep4_cache);
u8 result = u64x8_is_equal_mask (cache, k4_u64x8);
if (PREDICT_TRUE (result != 0))
{
last_k4->as_u64 =
vtep4_u512->vtep4_cache[count_trailing_zeros (result)].as_u64;
return VTEP_CHECK_PASS_UNCHANGED;
}
if (PREDICT_FALSE (!hash_get (t->vtep4, k4.as_u64)))
return VTEP_CHECK_FAIL;
vtep4_u512->vtep4_cache[vtep4_u512->idx].as_u64 = k4.as_u64;
vtep4_u512->idx = (vtep4_u512->idx + 1) & 0x7;
last_k4->as_u64 = k4.as_u64;
return VTEP_CHECK_PASS;
}
#endif
always_inline u8
vtep6_check (vtep_table_t * t, vlib_buffer_t * b0, ip6_header_t * ip60,
vtep6_key_t * last_k6)
{
vtep6_key_t k6;
k6.fib_index = vlib_buffer_get_ip6_fib_index (b0);
if (PREDICT_TRUE (k6.fib_index == last_k6->fib_index
&& ip60->dst_address.as_u64[0] == last_k6->addr.as_u64[0]
&& ip60->dst_address.as_u64[1] ==
last_k6->addr.as_u64[1]))
{
return VTEP_CHECK_PASS_UNCHANGED;
}
k6.addr = ip60->dst_address;
if (PREDICT_FALSE (!hash_get_mem (t->vtep6, &k6)))
return VTEP_CHECK_FAIL;
*last_k6 = k6;
return VTEP_CHECK_PASS;
}
#endif /* included_ip_vtep_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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