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/*---------------------------------------------------------------------------
* Copyright (c) 2009-2014 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.
*---------------------------------------------------------------------------
*/
#include <stdbool.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/ip/ip.h>
#include <vnet/vnet.h>
#include <vppinfra/error.h>
#define SIXRD_DEFAULT_MTU 1480 /* 1500 - IPv4 header */
typedef struct
{
u32 fib_index;
u32 hw_if_index;
u32 sw_if_index;
u32 tunnel_index;
ip6_address_t ip6_prefix;
ip4_address_t ip4_prefix;
ip4_address_t ip4_src;
u8 ip6_prefix_len;
u8 ip4_prefix_len;
/* helpers */
u8 shift;
u16 mtu;
bool security_check;
} sixrd_tunnel_t;
typedef struct
{
u16 msg_id_base;
/* pool of SIXRD domains */
sixrd_tunnel_t *tunnels;
u32 *tunnel_index_by_sw_if_index;
uword *tunnel_by_ip;
} sixrd_main_t;
#define foreach_sixrd_error \
/* Must be first. */ \
_(NONE, "valid SIXRD packets") \
_(BAD_PROTOCOL, "bad protocol") \
_(SEC_CHECK, "security check failed") \
_(NO_TUNNEL, "no tunnel")
typedef enum
{
#define _(sym, str) SIXRD_ERROR_##sym,
foreach_sixrd_error
#undef _
SIXRD_N_ERROR,
} sixrd_error_t;
extern sixrd_main_t sixrd_main;
/*
* sixrd_get_addr
*/
static_always_inline u32
sixrd_get_addr_net (const sixrd_tunnel_t * t, u64 dal)
{
/* 1:1 mode */
if (t->ip4_prefix_len == 32)
return (t->ip4_prefix.as_u32);
dal = clib_net_to_host_u64 (dal);
/* Grab 32 - ip4_prefix_len bits out of IPv6 address from offset
* ip6_prefix_len */
u32 mask = ~(~0ULL << (32 - t->ip4_prefix_len));
u32 ip4 =
clib_net_to_host_u32 (t->
ip4_prefix.as_u32) | ((u32) (dal >> t->
shift) & mask);
return clib_host_to_net_u32 (ip4);
}
static_always_inline sixrd_tunnel_t *
find_tunnel_by_ip4_address (ip4_address_t * ip)
{
sixrd_main_t *sm = &sixrd_main;
uword *p;
p = hash_get (sm->tunnel_by_ip, ip->as_u32);
if (!p)
return NULL;
return pool_elt_at_index (sm->tunnels, p[0]);
}
static_always_inline sixrd_tunnel_t *
ip4_sixrd_get_tunnel (u32 sdi, ip4_address_t * addr, u8 * error)
{
sixrd_tunnel_t *t = find_tunnel_by_ip4_address (addr);
if (!t)
{
*error = SIXRD_ERROR_NO_TUNNEL;
return NULL;
}
return t;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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