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|
/*
* decap.c - decapsulate VXLAN GPE
*
* Copyright (c) 2013 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 Functions for decapsulating VXLAN GPE tunnels
*
*/
#include <vlib/vlib.h>
#include <vnet/pg/pg.h>
#include <vnet/vxlan-gpe/vxlan_gpe.h>
vlib_node_registration_t vxlan_gpe_input_node;
/**
* @brief Struct for VXLAN GPE decap packet tracing
*
*/
typedef struct {
u32 next_index;
u32 tunnel_index;
u32 error;
} vxlan_gpe_rx_trace_t;
/**
* @brief Tracing function for VXLAN GPE packet decapsulation
*
* @param *s
* @param *args
*
* @return *s
*
*/
static u8 * format_vxlan_gpe_rx_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 *);
vxlan_gpe_rx_trace_t * t = va_arg (*args, vxlan_gpe_rx_trace_t *);
if (t->tunnel_index != ~0)
{
s = format (s, "VXLAN-GPE: tunnel %d next %d error %d", t->tunnel_index,
t->next_index, t->error);
}
else
{
s = format (s, "VXLAN-GPE: no tunnel next %d error %d\n", t->next_index,
t->error);
}
return s;
}
/**
* @brief Tracing function for VXLAN GPE packet decapsulation including length
*
* @param *s
* @param *args
*
* @return *s
*
*/
static u8 * format_vxlan_gpe_with_length (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 *);
return s;
}
/**
* @brief Common processing for IPv4 and IPv6 VXLAN GPE decap dispatch functions
*
* It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE
* tunnels are "terminate local". This means that there is no "TX" interface for this
* decap case, so that field in the buffer_metadata can be "used for something else".
* The something else in this case is, for the IPv4/IPv6 inner-packet type case, the
* FIB index used to look up the inner-packet's adjacency.
*
* vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
*
* @param *vm
* @param *node
* @param *from_frame
* @param is_ip4
*
* @return from_frame->n_vectors
*
*/
always_inline uword
vxlan_gpe_input (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame,
u8 is_ip4)
{
u32 n_left_from, next_index, *from, *to_next;
vxlan_gpe_main_t * ngm = &vxlan_gpe_main;
vnet_main_t * vnm = ngm->vnet_main;
vnet_interface_main_t * im = &vnm->interface_main;
u32 last_tunnel_index = ~0;
vxlan4_gpe_tunnel_key_t last_key4;
vxlan6_gpe_tunnel_key_t last_key6;
u32 pkts_decapsulated = 0;
u32 cpu_index = os_get_cpu_number ();
u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
if (is_ip4)
memset (&last_key4, 0xff, sizeof(last_key4));
else
memset (&last_key6, 0xff, sizeof(last_key6));
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
next_index = node->cached_next_index;
stats_sw_if_index = node->runtime_data[0];
stats_n_packets = stats_n_bytes = 0;
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 >= 4 && n_left_to_next >= 2)
{
u32 bi0, bi1;
vlib_buffer_t * b0, *b1;
u32 next0, next1;
ip4_vxlan_gpe_header_t * iuvn4_0, *iuvn4_1;
ip6_vxlan_gpe_header_t * iuvn6_0, *iuvn6_1;
uword * p0, *p1;
u32 tunnel_index0, tunnel_index1;
vxlan_gpe_tunnel_t * t0, *t1;
vxlan4_gpe_tunnel_key_t key4_0, key4_1;
vxlan6_gpe_tunnel_key_t key6_0, key6_1;
u32 error0, error1;
u32 sw_if_index0, sw_if_index1, len0, len1;
/* Prefetch next iteration. */
{
vlib_buffer_t * p2, *p3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
vlib_prefetch_buffer_header(p2, LOAD);
vlib_prefetch_buffer_header(p3, LOAD);
CLIB_PREFETCH(p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH(p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
}
bi0 = from[0];
bi1 = from[1];
to_next[0] = bi0;
to_next[1] = bi1;
from += 2;
to_next += 2;
n_left_to_next -= 2;
n_left_from -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
if (is_ip4)
{
/* udp leaves current_data pointing at the vxlan-gpe header */
vlib_buffer_advance (b0, -(word) (sizeof(udp_header_t) + sizeof(ip4_header_t)));
vlib_buffer_advance (b1, -(word) (sizeof(udp_header_t) + sizeof(ip4_header_t)));
iuvn4_0 = vlib_buffer_get_current (b0);
iuvn4_1 = vlib_buffer_get_current (b1);
/* pop (ip, udp, vxlan) */
vlib_buffer_advance (b0, sizeof(*iuvn4_0));
vlib_buffer_advance (b1, sizeof(*iuvn4_1));
}
else
{
/* udp leaves current_data pointing at the vxlan-gpe header */
vlib_buffer_advance (b0, -(word) (sizeof(udp_header_t) + sizeof(ip6_header_t)));
vlib_buffer_advance (b1, -(word) (sizeof(udp_header_t) + sizeof(ip6_header_t)));
iuvn6_0 = vlib_buffer_get_current (b0);
iuvn6_1 = vlib_buffer_get_current (b1);
/* pop (ip, udp, vxlan) */
vlib_buffer_advance (b0, sizeof(*iuvn6_0));
vlib_buffer_advance (b1, sizeof(*iuvn6_1));
}
tunnel_index0 = ~0;
tunnel_index1 = ~0;
error0 = 0;
error1 = 0;
if (is_ip4)
{
next0 = (iuvn4_0->vxlan.protocol < node->n_next_nodes) ?
iuvn4_0->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;
next1 = (iuvn4_1->vxlan.protocol < node->n_next_nodes) ?
iuvn4_1->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;
key4_0.local = iuvn4_0->ip4.dst_address.as_u32;
key4_1.local = iuvn4_1->ip4.dst_address.as_u32;
key4_0.remote = iuvn4_0->ip4.src_address.as_u32;
key4_1.remote = iuvn4_1->ip4.src_address.as_u32;
key4_0.vni = iuvn4_0->vxlan.vni_res;
key4_1.vni = iuvn4_1->vxlan.vni_res;
key4_0.pad = 0;
key4_1.pad = 0;
}
else /* is_ip6 */
{
next0 = (iuvn6_0->vxlan.protocol < node->n_next_nodes) ?
iuvn6_0->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;
next1 = (iuvn6_1->vxlan.protocol < node->n_next_nodes) ?
iuvn6_1->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;
key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0];
key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1];
key6_1.local.as_u64[0] = iuvn6_1->ip6.dst_address.as_u64[0];
key6_1.local.as_u64[1] = iuvn6_1->ip6.dst_address.as_u64[1];
key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0];
key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1];
key6_1.remote.as_u64[0] = iuvn6_1->ip6.src_address.as_u64[0];
key6_1.remote.as_u64[1] = iuvn6_1->ip6.src_address.as_u64[1];
key6_0.vni = iuvn6_0->vxlan.vni_res;
key6_1.vni = iuvn6_1->vxlan.vni_res;
}
/* Processing packet 0*/
if (is_ip4)
{
/* Processing for key4_0 */
if (PREDICT_FALSE((key4_0.as_u64[0] != last_key4.as_u64[0])
|| (key4_0.as_u64[1] != last_key4.as_u64[1])))
{
p0 = hash_get_mem(ngm->vxlan4_gpe_tunnel_by_key, &key4_0);
if (p0 == 0)
{
error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace0;
}
last_key4.as_u64[0] = key4_0.as_u64[0];
last_key4.as_u64[1] = key4_0.as_u64[1];
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
}
else /* is_ip6 */
{
/* Processing for key6_0 */
if (PREDICT_FALSE(memcmp (&key6_0, &last_key6, sizeof(last_key6)) != 0))
{
p0 = hash_get_mem(ngm->vxlan6_gpe_tunnel_by_key, &key6_0);
if (p0 == 0)
{
error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace0;
}
memcpy (&last_key6, &key6_0, sizeof(key6_0));
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
}
t0 = pool_elt_at_index(ngm->tunnels, tunnel_index0);
next0 = t0->protocol;
sw_if_index0 = t0->sw_if_index;
len0 = vlib_buffer_length_in_chain (vm, b0);
/* Required to make the l2 tag push / pop code work on l2 subifs */
vnet_update_l2_len (b0);
/**
* ip[46] lookup in the configured FIB
*/
vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
pkts_decapsulated++;
stats_n_packets += 1;
stats_n_bytes += len0;
if (PREDICT_FALSE(sw_if_index0 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len0;
if (stats_n_packets)
vlib_increment_combined_counter (
im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
cpu_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len0;
stats_sw_if_index = sw_if_index0;
}
trace0: b0->error = error0 ? node->errors[error0] : 0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof(*tr));
tr->next_index = next0;
tr->error = error0;
tr->tunnel_index = tunnel_index0;
}
/* Process packet 1 */
if (is_ip4)
{
/* Processing for key4_1 */
if (PREDICT_FALSE(
(key4_1.as_u64[0] != last_key4.as_u64[0])
|| (key4_1.as_u64[1] != last_key4.as_u64[1])))
{
p1 = hash_get_mem(ngm->vxlan4_gpe_tunnel_by_key, &key4_1);
if (p1 == 0)
{
error1 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace1;
}
last_key4.as_u64[0] = key4_1.as_u64[0];
last_key4.as_u64[1] = key4_1.as_u64[1];
tunnel_index1 = last_tunnel_index = p1[0];
}
else
tunnel_index1 = last_tunnel_index;
}
else /* is_ip6 */
{
/* Processing for key6_1 */
if (PREDICT_FALSE(memcmp (&key6_1, &last_key6, sizeof(last_key6)) != 0))
{
p1 = hash_get_mem(ngm->vxlan6_gpe_tunnel_by_key, &key6_1);
if (p1 == 0)
{
error1 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace1;
}
memcpy (&last_key6, &key6_1, sizeof(key6_1));
tunnel_index1 = last_tunnel_index = p1[0];
}
else
tunnel_index1 = last_tunnel_index;
}
t1 = pool_elt_at_index(ngm->tunnels, tunnel_index1);
next1 = t1->protocol;
sw_if_index1 = t1->sw_if_index;
len1 = vlib_buffer_length_in_chain (vm, b1);
/* Required to make the l2 tag push / pop code work on l2 subifs */
vnet_update_l2_len (b1);
/*
* ip[46] lookup in the configured FIB
*/
vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index;
pkts_decapsulated++;
stats_n_packets += 1;
stats_n_bytes += len1;
/* Batch stats increment on the same vxlan tunnel so counter
is not incremented per packet */
if (PREDICT_FALSE(sw_if_index1 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len1;
if (stats_n_packets)
vlib_increment_combined_counter (
im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
cpu_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len1;
stats_sw_if_index = sw_if_index1;
}
vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index;
trace1: b1->error = error1 ? node->errors[error1] : 0;
if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof(*tr));
tr->next_index = next1;
tr->error = error1;
tr->tunnel_index = tunnel_index1;
}
vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
n_left_to_next, bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t * b0;
u32 next0;
ip4_vxlan_gpe_header_t * iuvn4_0;
ip6_vxlan_gpe_header_t * iuvn6_0;
uword * p0;
u32 tunnel_index0;
vxlan_gpe_tunnel_t * t0;
vxlan4_gpe_tunnel_key_t key4_0;
vxlan6_gpe_tunnel_key_t key6_0;
u32 error0;
u32 sw_if_index0, len0;
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);
if (is_ip4)
{
/* udp leaves current_data pointing at the vxlan-gpe header */
vlib_buffer_advance (
b0, -(word) (sizeof(udp_header_t) + sizeof(ip4_header_t)));
iuvn4_0 = vlib_buffer_get_current (b0);
/* pop (ip, udp, vxlan) */
vlib_buffer_advance (b0, sizeof(*iuvn4_0));
}
else
{
/* udp leaves current_data pointing at the vxlan-gpe header */
vlib_buffer_advance (
b0, -(word) (sizeof(udp_header_t) + sizeof(ip6_header_t)));
iuvn6_0 = vlib_buffer_get_current (b0);
/* pop (ip, udp, vxlan) */
vlib_buffer_advance (b0, sizeof(*iuvn6_0));
}
tunnel_index0 = ~0;
error0 = 0;
if (is_ip4)
{
next0 =
(iuvn4_0->vxlan.protocol < node->n_next_nodes) ?
iuvn4_0->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;
key4_0.local = iuvn4_0->ip4.dst_address.as_u32;
key4_0.remote = iuvn4_0->ip4.src_address.as_u32;
key4_0.vni = iuvn4_0->vxlan.vni_res;
key4_0.pad = 0;
/* Processing for key4_0 */
if (PREDICT_FALSE(
(key4_0.as_u64[0] != last_key4.as_u64[0])
|| (key4_0.as_u64[1] != last_key4.as_u64[1])))
{
p0 = hash_get_mem(ngm->vxlan4_gpe_tunnel_by_key, &key4_0);
if (p0 == 0)
{
error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace00;
}
last_key4.as_u64[0] = key4_0.as_u64[0];
last_key4.as_u64[1] = key4_0.as_u64[1];
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
}
else /* is_ip6 */
{
next0 = (iuvn6_0->vxlan.protocol < node->n_next_nodes) ?
iuvn6_0->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;
key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0];
key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1];
key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0];
key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1];
key6_0.vni = iuvn6_0->vxlan.vni_res;
/* Processing for key6_0 */
if (PREDICT_FALSE(memcmp (&key6_0, &last_key6, sizeof(last_key6)) != 0))
{
p0 = hash_get_mem(ngm->vxlan6_gpe_tunnel_by_key, &key6_0);
if (p0 == 0)
{
error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace00;
}
memcpy (&last_key6, &key6_0, sizeof(key6_0));
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
}
t0 = pool_elt_at_index(ngm->tunnels, tunnel_index0);
next0 = t0->protocol;
sw_if_index0 = t0->sw_if_index;
len0 = vlib_buffer_length_in_chain (vm, b0);
/* Required to make the l2 tag push / pop code work on l2 subifs */
vnet_update_l2_len (b0);
/*
* ip[46] lookup in the configured FIB
*/
vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
pkts_decapsulated++;
stats_n_packets += 1;
stats_n_bytes += len0;
/* Batch stats increment on the same vxlan-gpe tunnel so counter
is not incremented per packet */
if (PREDICT_FALSE(sw_if_index0 != stats_sw_if_index))
{
stats_n_packets -= 1;
stats_n_bytes -= len0;
if (stats_n_packets)
vlib_increment_combined_counter (
im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
cpu_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
stats_n_packets = 1;
stats_n_bytes = len0;
stats_sw_if_index = sw_if_index0;
}
trace00: b0->error = error0 ? node->errors[error0] : 0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof(*tr));
tr->next_index = next0;
tr->error = error0;
tr->tunnel_index = tunnel_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);
}
vlib_node_increment_counter (vm, vxlan_gpe_input_node.index,
VXLAN_GPE_ERROR_DECAPSULATED, pkts_decapsulated);
/* Increment any remaining batch stats */
if (stats_n_packets)
{
vlib_increment_combined_counter (
im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, cpu_index,
stats_sw_if_index, stats_n_packets, stats_n_bytes);
node->runtime_data[0] = stats_sw_if_index;
}
return from_frame->n_vectors;
}
/**
* @brief Graph processing dispatch function for IPv4 VXLAN GPE
*
* @node vxlan4-gpe-input
* @param *vm
* @param *node
* @param *from_frame
*
* @return from_frame->n_vectors
*
*/
static uword
vxlan4_gpe_input (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return vxlan_gpe_input (vm, node, from_frame, /* is_ip4 */1);
}
/**
* @brief Graph processing dispatch function for IPv6 VXLAN GPE
*
* @node vxlan6-gpe-input
* @param *vm
* @param *node
* @param *from_frame
*
* @return from_frame->n_vectors - uword
*
*/
static uword
vxlan6_gpe_input (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return vxlan_gpe_input (vm, node, from_frame, /* is_ip4 */0);
}
/**
* @brief VXLAN GPE error strings
*/
static char * vxlan_gpe_error_strings[] = {
#define vxlan_gpe_error(n,s) s,
#include <vnet/vxlan-gpe/vxlan_gpe_error.def>
#undef vxlan_gpe_error
#undef _
};
VLIB_REGISTER_NODE (vxlan4_gpe_input_node) = {
.function = vxlan4_gpe_input,
.name = "vxlan4-gpe-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(vxlan_gpe_error_strings),
.error_strings = vxlan_gpe_error_strings,
.n_next_nodes = VXLAN_GPE_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [VXLAN_GPE_INPUT_NEXT_##s] = n,
foreach_vxlan_gpe_input_next
#undef _
},
.format_buffer = format_vxlan_gpe_with_length,
.format_trace = format_vxlan_gpe_rx_trace,
// $$$$ .unformat_buffer = unformat_vxlan_gpe_header,
};
VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_gpe_input_node, vxlan4_gpe_input);
VLIB_REGISTER_NODE (vxlan6_gpe_input_node) = {
.function = vxlan6_gpe_input,
.name = "vxlan6-gpe-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(vxlan_gpe_error_strings),
.error_strings = vxlan_gpe_error_strings,
.n_next_nodes = VXLAN_GPE_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [VXLAN_GPE_INPUT_NEXT_##s] = n,
foreach_vxlan_gpe_input_next
#undef _
},
.format_buffer = format_vxlan_gpe_with_length,
.format_trace = format_vxlan_gpe_rx_trace,
// $$$$ .unformat_buffer = unformat_vxlan_gpe_header,
};
VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_gpe_input_node, vxlan6_gpe_input);
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