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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.
*/
#include <vnet/bier/bier_imp.h>
#include <vnet/bier/bier_hdr_inlines.h>
#include <vnet/ip/ip.h>
/**
* @brief A struct to hold tracing information for the BIER imposition
* node.
*/
typedef struct bier_imp_trace_t_
{
/**
* BIER imposition object hit
*/
index_t imp;
/**
* BIER hdr applied
*/
bier_hdr_t hdr;
} bier_imp_trace_t;
always_inline uword
bier_imp_dpo_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame,
fib_protocol_t fproto,
bier_hdr_proto_id_t bproto)
{
u32 n_left_from, next_index, * from, * to_next;
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;
bier_imp_t *bimp0;
bier_hdr_t *hdr0;
u32 bi0, bii0;
u32 next0;
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);
bii0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
bimp0 = bier_imp_get(bii0);
if (FIB_PROTOCOL_IP4 == fproto)
{
/*
* decrement the TTL on ingress to the BIER domain
*/
ip4_header_t * ip0 = vlib_buffer_get_current(b0);
u32 checksum0;
checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
checksum0 += checksum0 >= 0xffff;
ip0->checksum = checksum0;
ip0->ttl -= 1;
/*
* calculate an entropy
*/
if (0 == vnet_buffer(b0)->ip.flow_hash)
{
vnet_buffer(b0)->ip.flow_hash =
ip4_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
}
}
if (FIB_PROTOCOL_IP6 == fproto)
{
/*
* decrement the TTL on ingress to the BIER domain
*/
ip6_header_t * ip0 = vlib_buffer_get_current(b0);
ip0->hop_limit -= 1;
/*
* calculate an entropy
*/
if (0 == vnet_buffer(b0)->ip.flow_hash)
{
vnet_buffer(b0)->ip.flow_hash =
ip6_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
}
}
/* Paint the BIER header */
vlib_buffer_advance(b0, -(sizeof(bier_hdr_t) +
bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
hdr0 = vlib_buffer_get_current(b0);
/* RPF check */
if (PREDICT_FALSE(BIER_RX_ITF == vnet_buffer(b0)->ip.adj_index[VLIB_RX]))
{
next0 = 0;
}
else
{
clib_memcpy_fast(hdr0, &bimp0->bi_hdr,
(sizeof(bier_hdr_t) +
bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
/*
* Fixup the entropy and protocol, both of which have a
* zero value post the paint job
*/
hdr0->bh_oam_dscp_proto |=
clib_host_to_net_u16(bproto << BIER_HDR_PROTO_FIELD_SHIFT);
hdr0->bh_first_word |=
clib_host_to_net_u32((vnet_buffer(b0)->ip.flow_hash &
BIER_HDR_ENTROPY_FIELD_MASK) <<
BIER_HDR_ENTROPY_FIELD_SHIFT);
/*
* use TTL 64 for the post enacp MPLS label/BIFT-ID
* this we be decremeted in bier_output node.
*/
vnet_buffer(b0)->mpls.ttl = 65;
/* next node */
next0 = bimp0->bi_dpo[fproto].dpoi_next_node;
vnet_buffer(b0)->ip.adj_index[VLIB_TX] =
bimp0->bi_dpo[fproto].dpoi_index;
}
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
bier_imp_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->imp = bii0;
tr->hdr = *hdr0;
}
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_bier_imp_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 *);
bier_imp_trace_t * t;
u32 indent;
t = va_arg (*args, bier_imp_trace_t *);
indent = format_get_indent (s);
s = format (s, "%U", format_bier_imp, t->imp, indent, BIER_SHOW_BRIEF);
return (s);
}
static uword
bier_imp_ip4 (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return (bier_imp_dpo_inline(vm, node, frame,
FIB_PROTOCOL_IP4,
BIER_HDR_PROTO_IPV4));
}
VLIB_REGISTER_NODE (bier_imp_ip4_node) = {
.function = bier_imp_ip4,
.name = "bier-imp-ip4",
.vector_size = sizeof (u32),
.format_trace = format_bier_imp_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "bier-drop",
}
};
VLIB_NODE_FUNCTION_MULTIARCH (bier_imp_ip4_node, bier_imp_ip4)
static uword
bier_imp_ip6 (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return (bier_imp_dpo_inline(vm, node, frame,
FIB_PROTOCOL_IP6,
BIER_HDR_PROTO_IPV6));
}
VLIB_REGISTER_NODE (bier_imp_ip6_node) = {
.function = bier_imp_ip6,
.name = "bier-imp-ip6",
.vector_size = sizeof (u32),
.format_trace = format_bier_imp_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
}
};
VLIB_NODE_FUNCTION_MULTIARCH (bier_imp_ip6_node, bier_imp_ip6)
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