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/*
* Copyright (c) 2015 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/vnet.h>
#include <vnet/pg/pg.h>
#include <vppinfra/error.h>
#include <srv6-localsid/srv6_localsid_sample.h>
typedef struct {
u32 localsid_index;
} srv6_localsid_sample_trace_t;
/* packet trace format function */
static u8 * format_srv6_localsid_sample_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 *);
srv6_localsid_sample_trace_t * t = va_arg (*args, srv6_localsid_sample_trace_t *);
s = format (s, "SRv6-sample-localsid: localsid_index %d\n",
t->localsid_index);
return s;
}
vlib_node_registration_t srv6_localsid_sample_node;
#define foreach_srv6_localsid_counter \
_(PROCESSED, "srv6-sample-localsid processed packets") \
_(NO_SRH, "(Error) No SRH.")
typedef enum {
#define _(sym,str) SRV6_LOCALSID_COUNTER_##sym,
foreach_srv6_localsid_counter
#undef _
SRV6_LOCALSID_N_COUNTERS,
} srv6_localsid_sample_counters;
static char * srv6_localsid_counter_strings[] = {
#define _(sym,string) string,
foreach_srv6_localsid_counter
#undef _
};
typedef enum {
SRV6_SAMPLE_LOCALSID_NEXT_ERROR,
SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP,
SRV6_SAMPLE_LOCALSID_N_NEXT,
} srv6_localsid_sample_next_t;
/**
* @brief Function doing End processing.
*/
//Fixme: support OAM (hop-by-hop header) here!
static_always_inline void
end_srh_processing (vlib_node_runtime_t * node,
vlib_buffer_t * b0,
ip6_header_t * ip0,
ip6_sr_header_t * sr0,
u32 * next0)
{
ip6_address_t *new_dst0;
if(PREDICT_TRUE(ip0->protocol == IP_PROTOCOL_IPV6_ROUTE))
{
if(PREDICT_TRUE(sr0->type == ROUTING_HEADER_TYPE_SR))
{
if(PREDICT_TRUE(sr0->segments_left != 0))
{
sr0->segments_left -= 1;
new_dst0 = (ip6_address_t *)(sr0->segments);
new_dst0 += sr0->segments_left;
ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
}
else
{
*next0 = SRV6_SAMPLE_LOCALSID_NEXT_ERROR;
b0->error = node->errors[SRV6_LOCALSID_COUNTER_NO_SRH];
}
}
else
{
/* Error. Routing header of type != SR */
*next0 = SRV6_SAMPLE_LOCALSID_NEXT_ERROR;
b0->error = node->errors[SRV6_LOCALSID_COUNTER_NO_SRH];
}
}
}
/*
* @brief SRv6 Sample Localsid graph node
* WARNING: YOU MUST DO THE DUAL LOOP
*/
static uword
srv6_localsid_sample_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 n_left_from, * from, * to_next;
u32 next_index;
u32 pkts_swapped = 0;
ip6_sr_main_t * sm = &sr_main;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
u32 cpu_index = os_get_cpu_number ();
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;
vlib_buffer_t * b0;
ip6_header_t * ip0 = 0;
ip6_sr_header_t * sr0;
u32 next0 = SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP;
ip6_sr_localsid_t *ls0;
srv6_localsid_sample_per_sid_memory_t *ls0_mem;
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);
ip0 = vlib_buffer_get_current (b0);
sr0 = (ip6_sr_header_t *)(ip0+1);
/* Lookup the SR End behavior based on IP DA (adj) */
ls0 = pool_elt_at_index (sm->localsids, vnet_buffer(b0)->ip.adj_index[VLIB_TX]);
ls0_mem = ls0->plugin_mem;
/* SRH processing */
end_srh_processing (node, b0, ip0, sr0, &next0);
/* ==================================================================== */
/* INSERT CODE HERE */
/* Example starts here */
//In this example we are changing the next VRF table by the one in CLI
vnet_buffer(b0)->sw_if_index[VLIB_TX] = ls0_mem->fib_table;
/* Example finishes here */
/* ==================================================================== */
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
srv6_localsid_sample_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->localsid_index = ls0 - sm->localsids;
}
/* This increments the SRv6 per LocalSID counters.*/
vlib_increment_combined_counter
(((next0 == SRV6_SAMPLE_LOCALSID_NEXT_ERROR) ? &(sm->sr_ls_invalid_counters) : &(sm->sr_ls_valid_counters)),
cpu_index,
ls0 - sm->localsids,
1, vlib_buffer_length_in_chain (vm, b0));
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
pkts_swapped ++;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
VLIB_REGISTER_NODE (srv6_localsid_sample_node) = {
.function = srv6_localsid_sample_fn,
.name = "srv6-localsid-sample",
.vector_size = sizeof (u32),
.format_trace = format_srv6_localsid_sample_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = SRV6_LOCALSID_N_COUNTERS,
.error_strings = srv6_localsid_counter_strings,
.n_next_nodes = SRV6_SAMPLE_LOCALSID_N_NEXT,
.next_nodes = {
[SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP] = "ip6-lookup",
[SRV6_SAMPLE_LOCALSID_NEXT_ERROR] = "error-drop",
},
};
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