/*
* 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 <vppinfra/error.h>
#include <srv6-as/as.h>
/******************************* Packet tracing *******************************/
typedef struct
{
u32 localsid_index;
} srv6_as_localsid_trace_t;
typedef struct
{
u8 error;
ip6_address_t src, dst;
} srv6_as_rewrite_trace_t;
static u8 *
format_srv6_as_localsid_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_as_localsid_trace_t *t = va_arg (*args, srv6_as_localsid_trace_t *);
return format (s, "SRv6-AS-localsid: localsid_index %d", t->localsid_index);
}
static u8 *
format_srv6_as_rewrite_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_as_rewrite_trace_t *t = va_arg (*args, srv6_as_rewrite_trace_t *);
if (PREDICT_FALSE (t->error != 0))
{
return format (s, "SRv6-AS-rewrite: cache is empty");
}
return format (s, "SRv6-AS-rewrite: src %U dst %U",
format_ip6_address, &t->src, format_ip6_address, &t->dst);
}
/***************************** Nodes registration *****************************/
vlib_node_registration_t srv6_as4_rewrite_node;
vlib_node_registration_t srv6_as6_rewrite_node;
/****************************** Packet counters *******************************/
#define foreach_srv6_as_rewrite_counter \
_(PROCESSED, "srv6-as rewritten packets") \
_(NO_RW, "(Error) No header for rewriting.")
typedef enum
{
#define _(sym,str) SRV6_AS_REWRITE_COUNTER_##sym,
foreach_srv6_as_rewrite_counter
#undef _
SRV6_AS_REWRITE_N_COUNTERS,
} srv6_as_rewrite_counters;
static char *srv6_as_rewrite_counter_strings[] = {
#define _(sym,string) string,
foreach_srv6_as_rewrite_counter
#undef _
};
/********************************* Next nodes *********************************/
typedef enum
{
SRV6_AS_LOCALSID_NEXT_ERROR,
SRV6_AS_LOCALSID_NEXT_REWRITE4,
SRV6_AS_LOCALSID_NEXT_REWRITE6,
SRV6_AS_LOCALSID_N_NEXT,
} srv6_as_localsid_next_t;
typedef enum
{
SRV6_AS_REWRITE_NEXT_ERROR,
SRV6_AS_REWRITE_NEXT_LOOKUP,
SRV6_AS_REWRITE_N_NEXT,
} srv6_as_rewrite_next_t;
/******************************* Local SID node *******************************/
/**
* @brief Function doing SRH processing for AS behavior
*/
static_always_inline void
end_as_processing (vlib_buffer_t * b0,
ip6_header_t * ip0,
srv6_as_localsid_t * ls0_mem, u32 * next0)
{
u16 encap_len;
ip6_ext_header_t *ext_hdr;
u8 hdr_type;
/* Compute encapsulation headers length */
encap_len = sizeof (ip6_header_t);
ext_hdr = (ip6_ext_header_t *) (ip0 + 1);
hdr_type = ip0->protocol;
while (ip6_ext_hdr (hdr_type))
{
encap_len += ip6_ext_header_len (ext_hdr);
hdr_type = ext_hdr->next_hdr;
ext_hdr = ip6_ext_next_header (ext_hdr);
}
/* Make sure next header is IP */
if (PREDICT_FALSE (hdr_type != IP_PROTOCOL_IPV6 &&
hdr_type != IP_PROTOCOL_IP_IN_IP))
{
return;
}
/* Remove IP header and extensions */
vlib_buffer_advance (b0, encap_len);
/* Set Xconnect adjacency to VNF */
vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0_mem->nh_adj;
if (ls0_mem->ip_version == DA_IP4)
*next0 = SRV6_AS_LOCALSID_NEXT_REWRITE4;
else if (ls0_mem->ip_version == DA_IP6)
*next0 = SRV6_AS_LOCALSID_NEXT_REWRITE6;
}
/**
* @brief SRv6 AS Localsid graph node
*/
static uword
srv6_as_localsid_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
ip6_sr_main_t *sm = &sr_main;
u32 n_left_from, next_index, *from, *to_next;
u32 cnt_packets = 0;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
u32 thread_index = vlib_get_thread_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);
/* TODO: Dual/quad loop */
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
ip6_header_t *ip0 = 0;
ip6_sr_localsid_t *ls0;
u32 next0 = SRV6_AS_LOCALSID_NEXT_ERROR;
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);
/* 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]);
/* SRH processing */
end_as_processing (b0, ip0, ls0->plugin_mem, &next0);
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
srv6_as_localsid_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_AS_LOCALSID_NEXT_ERROR) ?
&(sm->sr_ls_invalid_counters) :
&(sm->sr_ls_valid_counters)),
thread_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);
cnt_packets++;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (srv6_as_localsid_node) = {
.function = srv6_as_localsid_fn,
.name = "srv6-as-localsid",
.vector_size = sizeof (u32),
.format_trace = format_srv6_as_localsid_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = SRV6_AS_LOCALSID_N_NEXT,
.next_nodes = {
[SRV6_AS_LOCALSID_NEXT_REWRITE4] = "ip4-rewrite",
[SRV6_AS_LOCALSID_NEXT_REWRITE6] = "ip6-rewrite",
[SRV6_AS_LOCALSID_NEXT_ERROR] = "error-drop",
},
};
/* *INDENT-ON* */
/******************************* Rewriting node *******************************/
/**
* @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
*/
static uword
srv6_as4_rewrite_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
ip6_sr_main_t *srm = &sr_main;
srv6_as_main_t *sm = &srv6_as_main;
u32 n_left_from, next_index, *from, *to_next;
u32 cnt_packets = 0;
from = vlib_frame_vector_args (frame);
n_left_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);
/* TODO: Dual/quad loop */
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
ip4_header_t *ip0_encap = 0;
ip6_header_t *ip0 = 0;
ip6_sr_localsid_t *ls0;
srv6_as_localsid_t *ls0_mem;
u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
u16 new_l0 = 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);
ip0_encap = vlib_buffer_get_current (b0);
ls0 = pool_elt_at_index (srm->localsids,
sm->sw_iface_localsid4[vnet_buffer
(b0)->sw_if_index
[VLIB_RX]]);
ls0_mem = ls0->plugin_mem;
if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
{
next0 = SRV6_AS_REWRITE_NEXT_ERROR;
b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
}
else
{
ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
(vec_len (ls0_mem->rewrite) + b0->current_data));
clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
ip0 = vlib_buffer_get_current (b0);
/* Update inner IPv4 TTL and checksum */
u32 checksum0;
ip0_encap->ttl -= 1;
checksum0 = ip0_encap->checksum + clib_host_to_net_u16 (0x0100);
checksum0 += checksum0 >= 0xffff;
ip0_encap->checksum = checksum0;
/* Update outer IPv6 length (in case it has changed) */
new_l0 = vec_len (ls0_mem->rewrite) - sizeof (ip6_header_t) +
clib_net_to_host_u16 (ip0_encap->length);
ip0->payload_length = clib_host_to_net_u16 (new_l0);
}
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
srv6_as_rewrite_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof *tr);
tr->error = 0;
if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
{
tr->error = 1;
}
else
{
clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
sizeof tr->src.as_u8);
clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
sizeof tr->dst.as_u8);
}
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
cnt_packets++;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Update counters */
vlib_node_increment_counter (vm, srv6_as4_rewrite_node.index,
SRV6_AS_REWRITE_COUNTER_PROCESSED,
cnt_packets);
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (srv6_as4_rewrite_node) = {
.function = srv6_as4_rewrite_fn,
.name = "srv6-as4-rewrite",
.vector_size = sizeof (u32),
.format_trace = format_srv6_as_rewrite_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = SRV6_AS_REWRITE_N_COUNTERS,
.error_strings = srv6_as_rewrite_counter_strings,
.n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
.next_nodes = {
[SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
[SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
},
};
/* *INDENT-ON* */
/**
* @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
*/
static uword
srv6_as6_rewrite_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
ip6_sr_main_t *srm = &sr_main;
srv6_as_main_t *sm = &srv6_as_main;
u32 n_left_from, next_index, *from, *to_next;
u32 cnt_packets = 0;
from = vlib_frame_vector_args (frame);
n_left_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);
/* TODO: Dual/quad loop */
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
ip6_header_t *ip0 = 0, *ip0_encap = 0;
ip6_sr_localsid_t *ls0;
srv6_as_localsid_t *ls0_mem;
u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
u16 new_l0 = 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);
ip0_encap = vlib_buffer_get_current (b0);
ls0 = pool_elt_at_index (srm->localsids,
sm->sw_iface_localsid6[vnet_buffer
(b0)->sw_if_index
[VLIB_RX]]);
ls0_mem = ls0->plugin_mem;
if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
{
next0 = SRV6_AS_REWRITE_NEXT_ERROR;
b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
}
else
{
ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
(vec_len (ls0_mem->rewrite) + b0->current_data));
clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
ip0 = vlib_buffer_get_current (b0);
/* Update inner IPv6 hop limit */
ip0_encap->hop_limit -= 1;
/* Update outer IPv6 length (in case it has changed) */
new_l0 = vec_len (ls0_mem->rewrite) +
clib_net_to_host_u16 (ip0_encap->payload_length);
ip0->payload_length = clib_host_to_net_u16 (new_l0);
}
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
srv6_as_rewrite_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof *tr);
tr->error = 0;
if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
{
tr->error = 1;
}
else
{
clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
sizeof tr->src.as_u8);
clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
sizeof tr->dst.as_u8);
}
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
cnt_packets++;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Update counters */
vlib_node_increment_counter (vm, srv6_as6_rewrite_node.index,
SRV6_AS_REWRITE_COUNTER_PROCESSED,
cnt_packets);
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (srv6_as6_rewrite_node) = {
.function = srv6_as6_rewrite_fn,
.name = "srv6-as6-rewrite",
.vector_size = sizeof (u32),
.format_trace = format_srv6_as_rewrite_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = SRV6_AS_REWRITE_N_COUNTERS,
.error_strings = srv6_as_rewrite_counter_strings,
.n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
.next_nodes = {
[SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
[SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/