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|
/*
* Copyright (c) 2016 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.
*/
/**
* @file
* @brief Common utility functions for LISP-GPE interfaces.
*
*/
#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/udp.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/lisp-gpe/lisp_gpe.h>
#include <vnet/lisp-gpe/lisp_gpe_fwd_entry.h>
#include <vnet/lisp-gpe/lisp_gpe_tenant.h>
#include <vnet/lisp-gpe/lisp_gpe_adjacency.h>
#include <vnet/adj/adj.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/lisp-cp/lisp_cp_dpo.h>
/**
* @brief The VLIB node arc/edge from the interface's TX node, to the L2
* load-balanceing node. Which is where all packets go
*/
static uword l2_arc_to_lb;
#define foreach_lisp_gpe_tx_next \
_(DROP, "error-drop") \
_(IP4_LOOKUP, "ip4-lookup") \
_(IP6_LOOKUP, "ip6-lookup")
typedef enum
{
#define _(sym,str) LISP_GPE_TX_NEXT_##sym,
foreach_lisp_gpe_tx_next
#undef _
LISP_GPE_TX_N_NEXT,
} lisp_gpe_tx_next_t;
typedef struct
{
u32 tunnel_index;
} lisp_gpe_tx_trace_t;
u8 *
format_lisp_gpe_tx_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
lisp_gpe_tx_trace_t *t = va_arg (*args, lisp_gpe_tx_trace_t *);
s = format (s, "LISP-GPE-TX: tunnel %d", t->tunnel_index);
return s;
}
#define is_v4_packet(_h) ((*(u8*) _h) & 0xF0) == 0x40
/**
* @brief LISP-GPE interface TX (encap) function.
* @node lisp_gpe_interface_tx
*
* The LISP-GPE interface TX (encap) function.
*
* Looks up the associated tunnel based on the adjacency hit in the SD FIB
* and if the tunnel is multihomed it uses the flow hash to determine
* sub-tunnel, and rewrite string, to be used to encapsulate the packet.
*
* @param[in] vm vlib_main_t corresponding to the current thread.
* @param[in] node vlib_node_runtime_t data for this node.
* @param[in] frame vlib_frame_t whose contents should be dispatched.
*
* @return number of vectors in frame.
*/
static uword
lisp_gpe_interface_tx (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, next_index, *from, *to_next;
lisp_gpe_main_t *lgm = &lisp_gpe_main;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0, adj_index0, next0;
const ip_adjacency_t *adj0;
const dpo_id_t *dpo0;
vlib_buffer_t *b0;
u8 is_v4_0;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
/* Fixup the checksum and len fields in the LISP tunnel encap
* that was applied at the midchain node */
is_v4_0 = is_v4_packet (vlib_buffer_get_current (b0));
ip_udp_fixup_one (lgm->vlib_main, b0, is_v4_0);
/* Follow the DPO on which the midchain is stacked */
adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
adj0 = adj_get (adj_index0);
dpo0 = &adj0->sub_type.midchain.next_dpo;
next0 = dpo0->dpoi_next_node;
vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
lisp_gpe_tx_trace_t *tr = vlib_add_trace (vm, node, b0,
sizeof (*tr));
tr->tunnel_index = adj_index0;
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return from_frame->n_vectors;
}
static u8 *
format_lisp_gpe_name (u8 * s, va_list * args)
{
u32 dev_instance = va_arg (*args, u32);
return format (s, "lisp_gpe%d", dev_instance);
}
/* *INDENT-OFF* */
VNET_DEVICE_CLASS (lisp_gpe_device_class) = {
.name = "LISP_GPE",
.format_device_name = format_lisp_gpe_name,
.format_tx_trace = format_lisp_gpe_tx_trace,
.tx_function = lisp_gpe_interface_tx,
.no_flatten_output_chains = 1,
};
/* *INDENT-ON* */
u8 *
format_lisp_gpe_header_with_length (u8 * s, va_list * args)
{
lisp_gpe_header_t *h = va_arg (*args, lisp_gpe_header_t *);
u32 max_header_bytes = va_arg (*args, u32);
u32 header_bytes;
header_bytes = sizeof (h[0]);
if (max_header_bytes != 0 && header_bytes > max_header_bytes)
return format (s, "lisp-gpe header truncated");
s = format (s, "flags: ");
#define _(n,v) if (h->flags & v) s = format (s, "%s ", #n);
foreach_lisp_gpe_flag_bit;
#undef _
s = format (s, "\n ver_res %d res %d next_protocol %d iid %d(%x)",
h->ver_res, h->res, h->next_protocol,
clib_net_to_host_u32 (h->iid), clib_net_to_host_u32 (h->iid));
return s;
}
/* *INDENT-OFF* */
VNET_HW_INTERFACE_CLASS (lisp_gpe_hw_class) = {
.name = "LISP_GPE",
.format_header = format_lisp_gpe_header_with_length,
.build_rewrite = default_build_rewrite,
.build_rewrite = lisp_gpe_build_rewrite,
.update_adjacency = lisp_gpe_update_adjacency,
};
/* *INDENT-ON* */
typedef struct
{
u32 lb_index;
} l2_lisp_gpe_tx_trace_t;
static u8 *
format_l2_lisp_gpe_tx_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
l2_lisp_gpe_tx_trace_t *t = va_arg (*args, l2_lisp_gpe_tx_trace_t *);
s = format (s, "L2-LISP-GPE-TX: load-balance %d", t->lb_index);
return s;
}
/**
* @brief LISP-GPE interface TX (encap) function for L2 overlays.
* @node l2_lisp_gpe_interface_tx
*
* The L2 LISP-GPE interface TX (encap) function.
*
* Uses bridge domain index, source and destination ethernet addresses to
* lookup tunnel. If the tunnel is multihomed a flow has is used to determine
* the sub-tunnel and therefore the rewrite string to be used to encapsulate
* the packets.
*
* @param[in] vm vlib_main_t corresponding to the current thread.
* @param[in] node vlib_node_runtime_t data for this node.
* @param[in] frame vlib_frame_t whose contents should be dispatched.
*
* @return number of vectors in frame.
*/
static uword
l2_lisp_gpe_interface_tx (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, next_index, *from, *to_next;
lisp_gpe_main_t *lgm = &lisp_gpe_main;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *b0;
u32 bi0, lbi0;
ethernet_header_t *e0;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
e0 = vlib_buffer_get_current (b0);
vnet_buffer (b0)->lisp.overlay_afi = LISP_AFI_MAC;
/* lookup dst + src mac */
lbi0 = lisp_l2_fib_lookup (lgm, vnet_buffer (b0)->l2.bd_index,
e0->src_address, e0->dst_address);
vnet_buffer (b0)->ip.adj_index[VLIB_TX] = lbi0;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
l2_lisp_gpe_tx_trace_t *tr = vlib_add_trace (vm, node, b0,
sizeof (*tr));
tr->lb_index = lbi0;
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, l2_arc_to_lb);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return from_frame->n_vectors;
}
static u8 *
format_l2_lisp_gpe_name (u8 * s, va_list * args)
{
u32 dev_instance = va_arg (*args, u32);
return format (s, "l2_lisp_gpe%d", dev_instance);
}
/* *INDENT-OFF* */
VNET_DEVICE_CLASS (l2_lisp_gpe_device_class,static) = {
.name = "L2_LISP_GPE",
.format_device_name = format_l2_lisp_gpe_name,
.format_tx_trace = format_l2_lisp_gpe_tx_trace,
.tx_function = l2_lisp_gpe_interface_tx,
.no_flatten_output_chains = 1,
};
/* *INDENT-ON* */
static vnet_hw_interface_t *
lisp_gpe_create_iface (lisp_gpe_main_t * lgm, u32 vni, u32 dp_table,
vnet_device_class_t * dev_class,
tunnel_lookup_t * tuns)
{
u32 flen;
u32 hw_if_index = ~0;
u8 *new_name;
vnet_hw_interface_t *hi;
vnet_main_t *vnm = lgm->vnet_main;
/* create hw lisp_gpeX iface if needed, otherwise reuse existing */
flen = vec_len (lgm->free_tunnel_hw_if_indices);
if (flen > 0)
{
hw_if_index = lgm->free_tunnel_hw_if_indices[flen - 1];
_vec_len (lgm->free_tunnel_hw_if_indices) -= 1;
hi = vnet_get_hw_interface (vnm, hw_if_index);
/* rename interface */
new_name = format (0, "%U", dev_class->format_device_name, vni);
vec_add1 (new_name, 0);
vnet_rename_interface (vnm, hw_if_index, (char *) new_name);
vec_free (new_name);
/* clear old stats of freed interface before reuse */
vnet_interface_main_t *im = &vnm->interface_main;
vnet_interface_counter_lock (im);
vlib_zero_combined_counter (&im->combined_sw_if_counters
[VNET_INTERFACE_COUNTER_TX],
hi->sw_if_index);
vlib_zero_combined_counter (&im->combined_sw_if_counters
[VNET_INTERFACE_COUNTER_RX],
hi->sw_if_index);
vlib_zero_simple_counter (&im->sw_if_counters
[VNET_INTERFACE_COUNTER_DROP],
hi->sw_if_index);
vnet_interface_counter_unlock (im);
}
else
{
hw_if_index = vnet_register_interface (vnm, dev_class->index, vni,
lisp_gpe_hw_class.index, 0);
hi = vnet_get_hw_interface (vnm, hw_if_index);
}
hash_set (tuns->hw_if_index_by_dp_table, dp_table, hw_if_index);
/* set tunnel termination: post decap, packets are tagged as having been
* originated by lisp-gpe interface */
hash_set (tuns->sw_if_index_by_vni, vni, hi->sw_if_index);
hash_set (tuns->vni_by_sw_if_index, hi->sw_if_index, vni);
return hi;
}
static void
lisp_gpe_remove_iface (lisp_gpe_main_t * lgm, u32 hi_index, u32 dp_table,
tunnel_lookup_t * tuns)
{
vnet_main_t *vnm = lgm->vnet_main;
vnet_hw_interface_t *hi;
uword *vnip;
hi = vnet_get_hw_interface (vnm, hi_index);
/* disable interface */
vnet_sw_interface_set_flags (vnm, hi->sw_if_index, 0 /* down */ );
vnet_hw_interface_set_flags (vnm, hi->hw_if_index, 0 /* down */ );
hash_unset (tuns->hw_if_index_by_dp_table, dp_table);
vec_add1 (lgm->free_tunnel_hw_if_indices, hi->hw_if_index);
/* clean tunnel termination and vni to sw_if_index binding */
vnip = hash_get (tuns->vni_by_sw_if_index, hi->sw_if_index);
if (0 == vnip)
{
clib_warning ("No vni associated to interface %d", hi->sw_if_index);
return;
}
hash_unset (tuns->sw_if_index_by_vni, vnip[0]);
hash_unset (tuns->vni_by_sw_if_index, hi->sw_if_index);
}
static void
lisp_gpe_iface_set_table (u32 sw_if_index, u32 table_id)
{
fib_node_index_t fib_index;
fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
vec_validate (ip4_main.fib_index_by_sw_if_index, sw_if_index);
ip4_main.fib_index_by_sw_if_index[sw_if_index] = fib_index;
ip4_sw_interface_enable_disable (sw_if_index, 1);
fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, table_id);
vec_validate (ip6_main.fib_index_by_sw_if_index, sw_if_index);
ip6_main.fib_index_by_sw_if_index[sw_if_index] = fib_index;
ip6_sw_interface_enable_disable (sw_if_index, 1);
}
static void
lisp_gpe_tenant_del_default_routes (u32 table_id)
{
fib_protocol_t proto;
FOR_EACH_FIB_IP_PROTOCOL (proto)
{
fib_prefix_t prefix = {
.fp_proto = proto,
};
u32 fib_index;
fib_index = fib_table_find (prefix.fp_proto, table_id);
fib_table_entry_special_remove (fib_index, &prefix, FIB_SOURCE_LISP);
fib_table_unlock (fib_index, prefix.fp_proto);
}
}
static void
lisp_gpe_tenant_add_default_routes (u32 table_id)
{
fib_protocol_t proto;
FOR_EACH_FIB_IP_PROTOCOL (proto)
{
fib_prefix_t prefix = {
.fp_proto = proto,
};
u32 fib_index;
/*
* Add a deafult route that results in a control plane punt DPO
*/
fib_index = fib_table_find_or_create_and_lock (prefix.fp_proto, table_id);
fib_table_entry_special_dpo_add (fib_index, &prefix, FIB_SOURCE_LISP,
FIB_ENTRY_FLAG_EXCLUSIVE,
lisp_cp_dpo_get (fib_proto_to_dpo
(proto)));
}
}
/**
* @brief Add/del LISP-GPE L3 interface.
*
* Creates LISP-GPE interface, sets ingress arcs from lisp_gpeX_lookup,
* installs default routes that attract all traffic with no more specific
* routes to lgpe-ipx-lookup, set egress arcs to ipx-lookup, sets
* the interface in the right vrf and enables it.
*
* @param[in] lgm Reference to @ref lisp_gpe_main_t.
* @param[in] a Parameters to create interface.
*
* @return number of vectors in frame.
*/
u32
lisp_gpe_add_l3_iface (lisp_gpe_main_t * lgm, u32 vni, u32 table_id)
{
vnet_main_t *vnm = lgm->vnet_main;
tunnel_lookup_t *l3_ifaces = &lgm->l3_ifaces;
vnet_hw_interface_t *hi;
uword *hip, *si;
hip = hash_get (l3_ifaces->hw_if_index_by_dp_table, table_id);
if (hip)
{
clib_warning ("vrf %d already mapped to a vni", table_id);
return ~0;
}
si = hash_get (l3_ifaces->sw_if_index_by_vni, vni);
if (si)
{
clib_warning ("Interface for vni %d already exists", vni);
}
/* create lisp iface and populate tunnel tables */
hi = lisp_gpe_create_iface (lgm, vni, table_id,
&lisp_gpe_device_class, l3_ifaces);
/* insert default routes that point to lisp-cp lookup */
lisp_gpe_iface_set_table (hi->sw_if_index, table_id);
lisp_gpe_tenant_add_default_routes (table_id);
/* enable interface */
vnet_sw_interface_set_flags (vnm, hi->sw_if_index,
VNET_SW_INTERFACE_FLAG_ADMIN_UP);
vnet_hw_interface_set_flags (vnm, hi->hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
return (hi->sw_if_index);
}
void
lisp_gpe_del_l3_iface (lisp_gpe_main_t * lgm, u32 vni, u32 table_id)
{
vnet_main_t *vnm = lgm->vnet_main;
tunnel_lookup_t *l3_ifaces = &lgm->l3_ifaces;
vnet_hw_interface_t *hi;
uword *hip;
hip = hash_get (l3_ifaces->hw_if_index_by_dp_table, table_id);
if (hip == 0)
{
clib_warning ("The interface for vrf %d doesn't exist", table_id);
return;
}
hi = vnet_get_hw_interface (vnm, hip[0]);
lisp_gpe_remove_iface (lgm, hip[0], table_id, &lgm->l3_ifaces);
/* unset default routes */
ip4_sw_interface_enable_disable (hi->sw_if_index, 0);
ip6_sw_interface_enable_disable (hi->sw_if_index, 0);
lisp_gpe_tenant_del_default_routes (table_id);
}
/**
* @brief Add/del LISP-GPE L2 interface.
*
* Creates LISP-GPE interface, sets it in L2 mode in the appropriate
* bridge domain, sets egress arcs and enables it.
*
* @param[in] lgm Reference to @ref lisp_gpe_main_t.
* @param[in] a Parameters to create interface.
*
* @return number of vectors in frame.
*/
u32
lisp_gpe_add_l2_iface (lisp_gpe_main_t * lgm, u32 vni, u32 bd_id)
{
vnet_main_t *vnm = lgm->vnet_main;
tunnel_lookup_t *l2_ifaces = &lgm->l2_ifaces;
vnet_hw_interface_t *hi;
uword *hip, *si;
u16 bd_index;
bd_index = bd_find_or_add_bd_index (&bd_main, bd_id);
hip = hash_get (l2_ifaces->hw_if_index_by_dp_table, bd_index);
if (hip)
{
clib_warning ("bridge domain %d already mapped to a vni", bd_id);
return ~0;
}
si = hash_get (l2_ifaces->sw_if_index_by_vni, vni);
if (si)
{
clib_warning ("Interface for vni %d already exists", vni);
return ~0;
}
/* create lisp iface and populate tunnel tables */
hi = lisp_gpe_create_iface (lgm, vni, bd_index,
&l2_lisp_gpe_device_class, &lgm->l2_ifaces);
/* enable interface */
vnet_sw_interface_set_flags (vnm, hi->sw_if_index,
VNET_SW_INTERFACE_FLAG_ADMIN_UP);
vnet_hw_interface_set_flags (vnm, hi->hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
l2_arc_to_lb = vlib_node_add_named_next (vlib_get_main (),
hi->tx_node_index,
"l2-load-balance");
/* we're ready. add iface to l2 bridge domain */
set_int_l2_mode (lgm->vlib_main, vnm, MODE_L2_BRIDGE, hi->sw_if_index,
bd_index, 0, 0, 0);
return (hi->sw_if_index);
}
/**
* @brief Add/del LISP-GPE L2 interface.
*
* Creates LISP-GPE interface, sets it in L2 mode in the appropriate
* bridge domain, sets egress arcs and enables it.
*
* @param[in] lgm Reference to @ref lisp_gpe_main_t.
* @param[in] a Parameters to create interface.
*
* @return number of vectors in frame.
*/
void
lisp_gpe_del_l2_iface (lisp_gpe_main_t * lgm, u32 vni, u32 bd_id)
{
tunnel_lookup_t *l2_ifaces = &lgm->l2_ifaces;
u16 bd_index;
uword *hip;
bd_index = bd_find_or_add_bd_index (&bd_main, bd_id);
hip = hash_get (l2_ifaces->hw_if_index_by_dp_table, bd_index);
if (hip == 0)
{
clib_warning ("The interface for bridge domain %d doesn't exist",
bd_id);
return;
}
lisp_gpe_remove_iface (lgm, hip[0], bd_index, &lgm->l2_ifaces);
}
static clib_error_t *
lisp_gpe_add_del_iface_command_fn (vlib_main_t * vm, unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
u8 is_add = 1;
u32 table_id, vni, bd_id;
u8 vni_is_set = 0, vrf_is_set = 0, bd_index_is_set = 0;
if (vnet_lisp_gpe_enable_disable_status () == 0)
{
return clib_error_return (0, "LISP is disabled");
}
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "add"))
is_add = 1;
else if (unformat (line_input, "del"))
is_add = 0;
else if (unformat (line_input, "vrf %d", &table_id))
{
vrf_is_set = 1;
}
else if (unformat (line_input, "vni %d", &vni))
{
vni_is_set = 1;
}
else if (unformat (line_input, "bd %d", &bd_id))
{
bd_index_is_set = 1;
}
else
{
return clib_error_return (0, "parse error: '%U'",
format_unformat_error, line_input);
}
}
if (vrf_is_set && bd_index_is_set)
return clib_error_return (0,
"Cannot set both vrf and brdige domain index!");
if (!vni_is_set)
return clib_error_return (0, "vni must be set!");
if (!vrf_is_set && !bd_index_is_set)
return clib_error_return (0, "vrf or bridge domain index must be set!");
if (bd_index_is_set)
{
if (is_add)
{
if (~0 == lisp_gpe_tenant_l2_iface_add_or_lock (vni, bd_id))
return clib_error_return (0, "L2 interface not created");
}
else
lisp_gpe_tenant_l2_iface_unlock (vni);
}
else
{
if (is_add)
{
if (~0 == lisp_gpe_tenant_l3_iface_add_or_lock (vni, table_id))
return clib_error_return (0, "L3 interface not created");
}
else
lisp_gpe_tenant_l3_iface_unlock (vni);
}
return (NULL);
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (add_del_lisp_gpe_iface_command, static) = {
.path = "lisp gpe iface",
.short_help = "lisp gpe iface add/del vni <vni> vrf <vrf>",
.function = lisp_gpe_add_del_iface_command_fn,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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