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/*
* sixrd.c - 6RD specific functions (RFC5969)
*
* Copyright (c) 2018 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.
*/
/**
* This code supports the following sixrd modes:
*
* 32 EA bits (Complete IPv4 address is embedded):
* ea_bits_len = 32
* IPv4 suffix is embedded:
* ea_bits_len = < 32
* No embedded address bits (1:1 mode):
* ea_bits_len = 0
*/
#include "ipip.h"
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vnet/adj/adj.h>
#include <vnet/adj/adj_delegate.h>
#include <vnet/adj/adj_midchain.h>
#include <vnet/dpo/lookup_dpo.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_entry_track.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/plugin/plugin.h>
extern vlib_node_registration_t ip4_sixrd_node;
/**
* Adj delegate data
*/
typedef struct sixrd_adj_delegate_t_
{
u32 adj_index;
fib_node_t sixrd_node;
fib_node_index_t sixrd_fib_entry_index;
u32 sixrd_sibling;
} sixrd_adj_delegate_t;
/**
* Pool of delegate structs
*/
static sixrd_adj_delegate_t *sixrd_adj_delegate_pool;
/**
* Adj delegate registered type
*/
static adj_delegate_type_t sixrd_adj_delegate_type;
/**
* FIB node registered type
*/
static fib_node_type_t sixrd_fib_node_type;
static inline sixrd_adj_delegate_t *
sixrd_adj_from_base (adj_delegate_t * ad)
{
if (ad == NULL)
return (NULL);
return (pool_elt_at_index (sixrd_adj_delegate_pool, ad->ad_index));
}
static inline const sixrd_adj_delegate_t *
sixrd_adj_from_const_base (const adj_delegate_t * ad)
{
if (ad == NULL)
{
return (NULL);
}
return (pool_elt_at_index (sixrd_adj_delegate_pool, ad->ad_index));
}
static void
sixrd_fixup (vlib_main_t * vm,
const ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
{
ip4_header_t *ip4 = vlib_buffer_get_current (b0);
ip6_header_t *ip6 = vlib_buffer_get_current (b0) + sizeof (ip4_header_t);
const ipip_tunnel_t *t = data;
ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
ip4->dst_address.as_u32 =
sixrd_get_addr_net (t, ip6->dst_address.as_u64[0]);
ip4->checksum = ip4_header_checksum (ip4);
}
static void
ip6ip_fixup (vlib_main_t * vm,
const ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
{
const ipip_tunnel_t *t = data;
ip4_header_t *ip4 = vlib_buffer_get_current (b0);
ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
ip4->dst_address.as_u32 =
sixrd_get_addr_net (t, adj->sub_type.nbr.next_hop.as_u64[0]);
ip4->checksum = ip4_header_checksum (ip4);
}
static u8 *
sixrd_build_rewrite (vnet_main_t * vnm, u32 sw_if_index,
vnet_link_t link_type, const void *dst_address)
{
u8 *rewrite = NULL;
ipip_tunnel_t *t;
t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
if (!t)
return 0;
vec_validate (rewrite, sizeof (ip4_header_t) - 1);
ip4_header_t *ip4 = (ip4_header_t *) rewrite;
ip4->ip_version_and_header_length = 0x45;
ip4->ttl = 64;
ip4->protocol = IP_PROTOCOL_IPV6;
/* fixup ip4 header length and checksum after-the-fact */
ip4->src_address.as_u32 = t->tunnel_src.ip4.as_u32;
ip4->dst_address.as_u32 = 0;
ip4->checksum = ip4_header_checksum (ip4);
return rewrite;
}
static void
ip6ip_tunnel_stack (adj_index_t ai, u32 fib_entry_index)
{
ip_adjacency_t *adj = adj_get (ai);
ipip_tunnel_t *t;
u32 sw_if_index = adj->rewrite_header.sw_if_index;
t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
if (!t)
return;
/*
* find the adjacency that is contributed by the FIB entry
* that this tunnel resolves via, and use it as the next adj
* in the midchain
*/
if (vnet_hw_interface_get_flags (vnet_get_main (), t->hw_if_index) &
VNET_HW_INTERFACE_FLAG_LINK_UP)
{
adj_nbr_midchain_stack_on_fib_entry (ai,
fib_entry_index,
FIB_FORW_CHAIN_TYPE_UNICAST_IP4);
}
else
{
adj_nbr_midchain_unstack (ai);
}
}
static void
sixrd_tunnel_stack (adj_index_t ai, u32 fib_index)
{
dpo_id_t dpo = DPO_INVALID;
ip_adjacency_t *adj = adj_get (ai);
u32 sw_if_index = adj->rewrite_header.sw_if_index;
ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
if (!t)
return;
lookup_dpo_add_or_lock_w_fib_index (fib_index, DPO_PROTO_IP4,
LOOKUP_UNICAST, LOOKUP_INPUT_DST_ADDR,
LOOKUP_TABLE_FROM_CONFIG, &dpo);
adj_nbr_midchain_stack (ai, &dpo);
dpo_reset (&dpo);
}
static void
sixrd_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
{
ip_adjacency_t *adj = adj_get (ai);
ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
/* Not our tunnel */
if (!t)
return;
if (IP_LOOKUP_NEXT_BCAST == adj->lookup_next_index)
{
adj_nbr_midchain_update_rewrite (ai, sixrd_fixup, t, ADJ_FLAG_NONE,
sixrd_build_rewrite (vnm, sw_if_index,
adj_get_link_type
(ai), NULL));
sixrd_tunnel_stack (ai, t->fib_index);
}
else
{
sixrd_adj_delegate_t *sixrd_ad;
ip4_address_t da4;
da4.as_u32 =
sixrd_get_addr_net (t, adj->sub_type.nbr.next_hop.as_u64[0]);
fib_prefix_t pfx = {
.fp_proto = FIB_PROTOCOL_IP4,
.fp_len = 32,
.fp_addr = {
.ip4 = da4,
}
,
};
adj_nbr_midchain_update_rewrite (ai, ip6ip_fixup, t, ADJ_FLAG_NONE,
sixrd_build_rewrite (vnm, sw_if_index,
adj_get_link_type
(ai), NULL));
sixrd_ad =
sixrd_adj_from_base (adj_delegate_get (adj, sixrd_adj_delegate_type));
if (sixrd_ad == NULL)
{
pool_get (sixrd_adj_delegate_pool, sixrd_ad);
fib_node_init (&sixrd_ad->sixrd_node, sixrd_fib_node_type);
sixrd_ad->adj_index = ai;
sixrd_ad->sixrd_fib_entry_index =
fib_entry_track (t->fib_index, &pfx,
sixrd_fib_node_type,
sixrd_ad - sixrd_adj_delegate_pool,
&sixrd_ad->sixrd_sibling);
adj_delegate_add (adj, sixrd_adj_delegate_type,
sixrd_ad - sixrd_adj_delegate_pool);
ip6ip_tunnel_stack (ai, sixrd_ad->sixrd_fib_entry_index);
}
}
}
clib_error_t *
sixrd_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
/* Always up */
vnet_hw_interface_set_flags (vnm, hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
return /* no error */ 0;
}
/* *INDENT-OFF* */
VNET_HW_INTERFACE_CLASS(sixrd_hw_interface_class) = {
.name = "ip6ip-6rd",
.build_rewrite = sixrd_build_rewrite,
.update_adjacency = sixrd_update_adj,
};
VNET_DEVICE_CLASS(sixrd_device_class) = {
.name = "ip6ip-6rd",
.admin_up_down_function = sixrd_interface_admin_up_down,
#ifdef SOON
.clear counter = 0;
#endif
}
;
/* *INDENT-ON* */
int
sixrd_add_tunnel (ip6_address_t * ip6_prefix, u8 ip6_prefix_len,
ip4_address_t * ip4_prefix, u8 ip4_prefix_len,
ip4_address_t * ip4_src, bool security_check,
u32 ip4_fib_index, u32 ip6_fib_index, u32 * sw_if_index)
{
ipip_main_t *gm = &ipip_main;
ipip_tunnel_t *t;
if ((ip6_prefix_len + 32 - ip4_prefix_len) > 64)
return VNET_API_ERROR_INVALID_VALUE;
/* Tunnel already configured */
ip46_address_t src = ip46_address_initializer, dst =
ip46_address_initializer;
ip_set (&src, ip4_src, true);
ipip_tunnel_key_t key;
ipip_mk_key_i (IPIP_TRANSPORT_IP4, IPIP_MODE_6RD, &src, &dst, ip4_fib_index,
&key);
t = ipip_tunnel_db_find (&key);
if (t)
return VNET_API_ERROR_IF_ALREADY_EXISTS;
/* Get tunnel index */
pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
clib_memset (t, 0, sizeof (*t));
u32 t_idx = t - gm->tunnels; /* tunnel index (or instance) */
/* Init tunnel struct */
t->mode = IPIP_MODE_6RD;
t->sixrd.ip4_prefix.as_u32 = ip4_prefix->as_u32;
t->sixrd.ip4_prefix_len = ip4_prefix_len;
t->sixrd.ip6_prefix = *ip6_prefix;
t->sixrd.ip6_prefix_len = ip6_prefix_len;
t->sixrd.ip6_fib_index = ip6_fib_index;
t->tunnel_src = src;
t->sixrd.security_check = security_check;
t->sixrd.shift =
(ip4_prefix_len < 32) ? 64 - ip6_prefix_len - (32 - ip4_prefix_len) : 0;
/* Create interface */
u32 hw_if_index =
vnet_register_interface (vnet_get_main (), sixrd_device_class.index,
t_idx,
sixrd_hw_interface_class.index, t_idx);
/* Default the interface to up and enable IPv6 (payload) */
vnet_hw_interface_t *hi =
vnet_get_hw_interface (vnet_get_main (), hw_if_index);
t->hw_if_index = hw_if_index;
t->fib_index = ip4_fib_index;
t->sw_if_index = hi->sw_if_index;
t->dev_instance = t_idx;
t->user_instance = t_idx;
vnet_sw_interface_set_mtu (vnet_get_main (), t->sw_if_index, 1480);
ipip_tunnel_db_add (t, &key);
vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, hi->sw_if_index,
~0);
gm->tunnel_index_by_sw_if_index[hi->sw_if_index] = t_idx;
vnet_hw_interface_set_flags (vnet_get_main (), hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
vnet_sw_interface_set_flags (vnet_get_main (), hi->sw_if_index,
VNET_SW_INTERFACE_FLAG_ADMIN_UP);
ip6_sw_interface_enable_disable (t->sw_if_index, true);
/* Create IPv6 route/adjacency */
/* *INDENT-OFF* */
fib_prefix_t pfx6 = {
.fp_proto = FIB_PROTOCOL_IP6,
.fp_len = t->sixrd.ip6_prefix_len,
.fp_addr = {
.ip6 = t->sixrd.ip6_prefix,
},
};
/* *INDENT-ON* */
fib_table_lock (ip6_fib_index, FIB_PROTOCOL_IP6, FIB_SOURCE_6RD);
fib_table_entry_update_one_path (ip6_fib_index, &pfx6, FIB_SOURCE_6RD,
FIB_ENTRY_FLAG_ATTACHED, DPO_PROTO_IP6,
&ADJ_BCAST_ADDR, t->sw_if_index, ~0, 1,
NULL, FIB_ROUTE_PATH_FLAG_NONE);
*sw_if_index = t->sw_if_index;
if (!gm->ip4_protocol_registered)
{
vlib_node_t *ipip4_input =
vlib_get_node_by_name (gm->vlib_main, (u8 *) "ipip4-input");
ASSERT (ipip4_input);
ip4_register_protocol (IP_PROTOCOL_IPV6, ipip4_input->index);
}
return 0;
}
/*
* sixrd_del_tunnel
*/
int
sixrd_del_tunnel (u32 sw_if_index)
{
ipip_main_t *gm = &ipip_main;
ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
ipip_tunnel_key_t key;
if (!t)
{
clib_warning ("SIXRD tunnel delete: tunnel does not exist: %d",
sw_if_index);
return -1;
}
/* *INDENT-OFF* */
fib_prefix_t pfx6 = {
.fp_proto = FIB_PROTOCOL_IP6,
.fp_len = t->sixrd.ip6_prefix_len,
.fp_addr = {
.ip6 = t->sixrd.ip6_prefix,
},
};
/* *INDENT-ON* */
fib_table_entry_path_remove (t->sixrd.ip6_fib_index, &pfx6,
FIB_SOURCE_6RD,
DPO_PROTO_IP6,
&ADJ_BCAST_ADDR, t->sw_if_index, ~0, 1,
FIB_ROUTE_PATH_FLAG_NONE);
fib_table_unlock (t->sixrd.ip6_fib_index, FIB_PROTOCOL_IP6, FIB_SOURCE_6RD);
vnet_sw_interface_set_flags (vnet_get_main (), t->sw_if_index,
0 /* down */ );
ip6_sw_interface_enable_disable (t->sw_if_index, false);
gm->tunnel_index_by_sw_if_index[t->sw_if_index] = ~0;
vnet_delete_hw_interface (vnet_get_main (), t->hw_if_index);
ipip_mk_key (t, &key);
ipip_tunnel_db_remove (t, &key);
pool_put (gm->tunnels, t);
return 0;
}
static void
sixrd_adj_delegate_adj_deleted (adj_delegate_t * aed)
{
sixrd_adj_delegate_t *sixrd_ad;
sixrd_ad = sixrd_adj_from_base (aed);
fib_entry_untrack (sixrd_ad->sixrd_fib_entry_index,
sixrd_ad->sixrd_sibling);
pool_put (sixrd_adj_delegate_pool, sixrd_ad);
}
static u8 *
sixrd_adj_delegate_format (const adj_delegate_t * aed, u8 * s)
{
const sixrd_adj_delegate_t *sixrd_ad;
sixrd_ad = sixrd_adj_from_const_base (aed);
s = format (s, "SIXRD:[fib-entry:%d]", sixrd_ad->sixrd_fib_entry_index);
return (s);
}
static void
sixrd_fib_node_last_lock_gone (fib_node_t * node)
{
/* top of the dependency tree, locks not managed here. */
}
static sixrd_adj_delegate_t *
sixrd_adj_delegate_from_fib_node (fib_node_t * node)
{
return ((sixrd_adj_delegate_t *) (((char *) node) -
STRUCT_OFFSET_OF (sixrd_adj_delegate_t,
sixrd_node)));
}
static fib_node_back_walk_rc_t
sixrd_fib_node_back_walk_notify (fib_node_t * node,
fib_node_back_walk_ctx_t * ctx)
{
sixrd_adj_delegate_t *sixrd_ad;
sixrd_ad = sixrd_adj_delegate_from_fib_node (node);
ip6ip_tunnel_stack (sixrd_ad->adj_index, sixrd_ad->sixrd_fib_entry_index);
return (FIB_NODE_BACK_WALK_CONTINUE);
}
/**
* Function definition to get a FIB node from its index
*/
static fib_node_t *
sixrd_fib_node_get (fib_node_index_t index)
{
sixrd_adj_delegate_t *sixrd_ad;
sixrd_ad = pool_elt_at_index (sixrd_adj_delegate_pool, index);
return (&sixrd_ad->sixrd_node);
}
/**
* VFT registered with the adjacency delegate
*/
const static adj_delegate_vft_t sixrd_adj_delegate_vft = {
.adv_adj_deleted = sixrd_adj_delegate_adj_deleted,
.adv_format = sixrd_adj_delegate_format,
};
/**
* VFT registered with the FIB node for the adj delegate
*/
const static fib_node_vft_t sixrd_fib_node_vft = {
.
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