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/*
* nsh.c: nsh packet processing
*
* 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.
*/
#include <vlib/vlib.h>
#include <vnet/pg/pg.h>
#include <vnet/nsh-vxlan-gpe/nsh_vxlan_gpe.h>
vlib_node_registration_t nsh_vxlan_gpe_input_node;
/* From nsh-gre */
u8 * format_nsh_header_with_length (u8 * s, va_list * args);
typedef struct {
u32 next_index;
u32 tunnel_index;
u32 error;
nsh_header_t h;
} nsh_vxlan_gpe_rx_trace_t;
static u8 * format_nsh_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 *);
nsh_vxlan_gpe_rx_trace_t * t = va_arg (*args, nsh_vxlan_gpe_rx_trace_t *);
if (t->tunnel_index != ~0)
{
s = format (s, "NSH-VXLAN: tunnel %d next %d error %d", t->tunnel_index,
t->next_index, t->error);
}
else
{
s = format (s, "NSH-VXLAN: no tunnel next %d error %d\n", t->next_index,
t->error);
}
s = format (s, "\n %U", format_nsh_header_with_length, &t->h,
(u32) sizeof (t->h) /* max size */);
return s;
}
static uword
nsh_vxlan_gpe_input (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, next_index, * from, * to_next;
nsh_vxlan_gpe_main_t * ngm = &nsh_vxlan_gpe_main;
u32 last_tunnel_index = ~0;
nsh_vxlan_gpe_tunnel_key_t last_key;
u32 pkts_decapsulated = 0;
memset (&last_key, 0xff, sizeof (last_key));
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 >= 4 && n_left_to_next >= 2)
{
u32 bi0, bi1;
vlib_buffer_t * b0, * b1;
u32 next0, next1;
ip4_vxlan_gpe_and_nsh_header_t * iuvn0, * iuvn1;
uword * p0, * p1;
u32 tunnel_index0, tunnel_index1;
nsh_vxlan_gpe_tunnel_t * t0, * t1;
nsh_vxlan_gpe_tunnel_key_t key0, key1;
u32 error0, error1;
/* 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);
/* udp leaves current_data pointing at the vxlan 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)));
iuvn0 = vlib_buffer_get_current (b0);
iuvn1 = vlib_buffer_get_current (b1);
/* pop (ip, udp, vxlan, nsh) */
vlib_buffer_advance (b0, sizeof (*iuvn0));
vlib_buffer_advance (b1, sizeof (*iuvn1));
tunnel_index0 = ~0;
error0 = 0;
next0 = NSH_VXLAN_GPE_INPUT_NEXT_DROP;
tunnel_index1 = ~0;
error1 = 0;
next1 = NSH_VXLAN_GPE_INPUT_NEXT_DROP;
key0.src = iuvn0->ip4.src_address.as_u32;
key0.vni = iuvn0->vxlan.vni_res;
key0.spi_si = iuvn0->nsh.spi_si;
key0.pad = 0;
if (PREDICT_FALSE ((key0.as_u64[0] != last_key.as_u64[0])
|| (key0.as_u64[1] != last_key.as_u64[1])))
{
p0 = hash_get_mem (ngm->nsh_vxlan_gpe_tunnel_by_key, &key0);
if (p0 == 0)
{
error0 = NSH_VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace0;
}
last_key.as_u64[0] = key0.as_u64[0];
last_key.as_u64[1] = key0.as_u64[1];
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
t0 = pool_elt_at_index (ngm->tunnels, tunnel_index0);
next0 = t0->decap_next_index;
/* Required to make the l2 tag push / pop code work on l2 subifs */
vnet_update_l2_len (b0);
if (next0 == NSH_VXLAN_GPE_INPUT_NEXT_NSH_VXLAN_GPE_ENCAP)
{
/*
* Functioning as SFF (ie "half NSH tunnel mode")
* If ingress (we are in decap.c) with NSH header, and 'decap next nsh-vxlan-gpe' then "NSH switch"
* 1. Take DST, remap to SRC, remap other keys in place
* 2. Look up new t0 as per above
* 3. Set sw_if_index[VLIB_TX] to be t0->sw_if_index
*/
uword * next_p0;
nsh_vxlan_gpe_tunnel_t * next_t0;
nsh_vxlan_gpe_tunnel_key_t next_key0;
next_key0.src = iuvn0->ip4.dst_address.as_u32;
next_key0.vni = iuvn0->vxlan.vni_res;
next_key0.spi_si = iuvn0->nsh.spi_si;
next_key0.pad = 0;
next_p0 = hash_get_mem (ngm->nsh_vxlan_gpe_tunnel_by_key, &next_key0);
if (next_p0 == 0)
{
error0 = NSH_VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace0;
}
next_t0 = pool_elt_at_index (ngm->tunnels, next_p0[0]);
vnet_buffer(b0)->sw_if_index[VLIB_TX] = next_t0->sw_if_index;
}
else
{
/*
* ip[46] lookup in the configured FIB
* nsh-vxlan-gpe-encap, here's the encap tunnel sw_if_index
*/
vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
}
trace0:
b0->error = error0 ? node->errors[error0] : 0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
nsh_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;
tr->h = iuvn0->nsh;
}
key1.src = iuvn1->ip4.src_address.as_u32;
key1.vni = iuvn1->vxlan.vni_res;
key1.spi_si = iuvn1->nsh.spi_si;
key1.pad = 0;
if (PREDICT_FALSE ((key1.as_u64[0] != last_key.as_u64[0])
|| (key1.as_u64[1] != last_key.as_u64[1])))
{
p1 = hash_get_mem (ngm->nsh_vxlan_gpe_tunnel_by_key, &key1);
if (p1 == 0)
{
error1 = NSH_VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace1;
}
last_key.as_u64[0] = key1.as_u64[0];
last_key.as_u64[1] = key1.as_u64[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->decap_next_index;
/* Required to make the l2 tag push / pop code work on l2 subifs */
vnet_update_l2_len (b1);
if (next1 == NSH_VXLAN_GPE_INPUT_NEXT_NSH_VXLAN_GPE_ENCAP)
{
/*
* Functioning as SFF (ie "half NSH tunnel mode")
* If ingress (we are in decap.c) with NSH header, and 'decap next nsh-vxlan-gpe' then "NSH switch"
* 1. Take DST, remap to SRC, remap other keys in place
* 2. Look up new t0 as per above
* 3. Set sw_if_index[VLIB_TX] to be t0->sw_if_index
*/
uword * next_p1;
nsh_vxlan_gpe_tunnel_t * next_t1;
nsh_vxlan_gpe_tunnel_key_t next_key1;
next_key1.src = iuvn0->ip4.dst_address.as_u32;
next_key1.vni = iuvn0->vxlan.vni_res;
next_key1.spi_si = iuvn0->nsh.spi_si;
next_key1.pad = 0;
next_p1 = hash_get_mem (ngm->nsh_vxlan_gpe_tunnel_by_key, &next_key1);
if (next_p1 == 0)
{
error1 = NSH_VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace1;
}
next_t1 = pool_elt_at_index (ngm->tunnels, next_p1[0]);
vnet_buffer(b1)->sw_if_index[VLIB_TX] = next_t1->sw_if_index;
}
else
{
/*
* ip[46] lookup in the configured FIB
* nsh-vxlan-gpe-encap, here's the encap tunnel sw_if_index
*/
vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index;
}
vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index;
pkts_decapsulated += 2;
trace1:
b1->error = error1 ? node->errors[error1] : 0;
if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
{
nsh_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;
tr->h = iuvn1->nsh;
}
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_and_nsh_header_t * iuvn0;
uword * p0;
u32 tunnel_index0;
nsh_vxlan_gpe_tunnel_t * t0;
nsh_vxlan_gpe_tunnel_key_t key0;
u32 error0;
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);
/* udp leaves current_data pointing at the vxlan header */
vlib_buffer_advance
(b0, -(word)(sizeof(udp_header_t)+sizeof(ip4_header_t)));
iuvn0 = vlib_buffer_get_current (b0);
/* pop (ip, udp, vxlan, nsh) */
vlib_buffer_advance (b0, sizeof (*iuvn0));
tunnel_index0 = ~0;
error0 = 0;
next0 = NSH_VXLAN_GPE_INPUT_NEXT_DROP;
key0.src = iuvn0->ip4.src_address.as_u32;
key0.vni = iuvn0->vxlan.vni_res;
key0.spi_si = iuvn0->nsh.spi_si;
key0.pad = 0;
if (PREDICT_FALSE ((key0.as_u64[0] != last_key.as_u64[0])
|| (key0.as_u64[1] != last_key.as_u64[1])))
{
p0 = hash_get_mem (ngm->nsh_vxlan_gpe_tunnel_by_key, &key0);
if (p0 == 0)
{
error0 = NSH_VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace00;
}
last_key.as_u64[0] = key0.as_u64[0];
last_key.as_u64[1] = key0.as_u64[1];
tunnel_index0 = last_tunnel_index = p0[0];
}
else
tunnel_index0 = last_tunnel_index;
t0 = pool_elt_at_index (ngm->tunnels, tunnel_index0);
next0 = t0->decap_next_index;
/* Required to make the l2 tag push / pop code work on l2 subifs */
vnet_update_l2_len (b0);
if (next0 == NSH_VXLAN_GPE_INPUT_NEXT_NSH_VXLAN_GPE_ENCAP)
{
/*
* Functioning as SFF (ie "half NSH tunnel mode")
* If ingress (we are in decap.c) with NSH header, and 'decap next nsh-vxlan-gpe' then "NSH switch"
* 1. Take DST, remap to SRC, remap other keys in place
* 2. Look up new t0 as per above
* 3. Set sw_if_index[VLIB_TX] to be t0->sw_if_index
*/
uword * next_p0;
nsh_vxlan_gpe_tunnel_t * next_t0;
nsh_vxlan_gpe_tunnel_key_t next_key0;
next_key0.src = iuvn0->ip4.dst_address.as_u32;
next_key0.vni = iuvn0->vxlan.vni_res;
next_key0.spi_si = iuvn0->nsh.spi_si;
next_key0.pad = 0;
next_p0 = hash_get_mem (ngm->nsh_vxlan_gpe_tunnel_by_key, &next_key0);
if (next_p0 == 0)
{
error0 = NSH_VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
goto trace00;
}
next_t0 = pool_elt_at_index (ngm->tunnels, next_p0[0]);
vnet_buffer(b0)->sw_if_index[VLIB_TX] = next_t0->sw_if_index;
}
else
{
/*
* ip[46] lookup in the configured FIB
* nsh-vxlan-gpe-encap, here's the encap tunnel sw_if_index
*/
vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
}
pkts_decapsulated ++;
trace00:
b0->error = error0 ? node->errors[error0] : 0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
nsh_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;
tr->h = iuvn0->nsh;
}
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, nsh_vxlan_gpe_input_node.index,
NSH_VXLAN_GPE_ERROR_DECAPSULATED,
pkts_decapsulated);
return from_frame->n_vectors;
}
static char * nsh_vxlan_gpe_error_strings[] = {
#define nsh_vxlan_gpe_error(n,s) s,
#include <vnet/nsh-vxlan-gpe/nsh_vxlan_gpe_error.def>
#undef nsh_vxlan_gpe_error
#undef _
};
VLIB_REGISTER_NODE (nsh_vxlan_gpe_input_node) = {
.function = nsh_vxlan_gpe_input,
.name = "nsh-vxlan-gpe-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = NSH_VXLAN_GPE_N_ERROR,
.error_strings = nsh_vxlan_gpe_error_strings,
.n_next_nodes = NSH_VXLAN_GPE_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [NSH_VXLAN_GPE_INPUT_NEXT_##s] = n,
foreach_nsh_vxlan_gpe_input_next
#undef _
},
.format_buffer = format_nsh_header_with_length,
.format_trace = format_nsh_vxlan_gpe_rx_trace,
// $$$$ .unformat_buffer = unformat_nsh_vxlan_gpe_header,
};
|