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gerrit.nordix.org / fdio / vpp / 3900fe53fc15dbf07b86cfffa9877c7b15fb874c / . / src / vnet / ip / ip6_forward.c
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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.
*/
/*
* ip/ip6_forward.c: IP v6 forwarding
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
#include <vnet/srp/srp.h> /* for srp_hw_interface_class */
#include <vppinfra/cache.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/dpo/classify_dpo.h>
#include <vppinfra/bihash_template.c>
/**
* @file
* @brief IPv6 Forwarding.
*
* This file contains the source code for IPv6 forwarding.
*/
void
ip6_forward_next_trace (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
vlib_rx_or_tx_t which_adj_index);
always_inline uword
ip6_lookup_inline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
ip6_main_t *im = &ip6_main;
vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
u32 n_left_from, n_left_to_next, *from, *to_next;
ip_lookup_next_t next;
u32 cpu_index = os_get_cpu_number ();
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next = node->cached_next_index;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
vlib_buffer_t *p0, *p1;
u32 pi0, pi1, lbi0, lbi1, wrong_next;
ip_lookup_next_t next0, next1;
ip6_header_t *ip0, *ip1;
ip6_address_t *dst_addr0, *dst_addr1;
u32 fib_index0, fib_index1;
u32 flow_hash_config0, flow_hash_config1;
const dpo_id_t *dpo0, *dpo1;
const load_balance_t *lb0, *lb1;
/* 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, sizeof (ip0[0]), LOAD);
CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
}
pi0 = to_next[0] = from[0];
pi1 = to_next[1] = from[1];
p0 = vlib_get_buffer (vm, pi0);
p1 = vlib_get_buffer (vm, pi1);
ip0 = vlib_buffer_get_current (p0);
ip1 = vlib_buffer_get_current (p1);
dst_addr0 = &ip0->dst_address;
dst_addr1 = &ip1->dst_address;
fib_index0 =
vec_elt (im->fib_index_by_sw_if_index,
vnet_buffer (p0)->sw_if_index[VLIB_RX]);
fib_index1 =
vec_elt (im->fib_index_by_sw_if_index,
vnet_buffer (p1)->sw_if_index[VLIB_RX]);
fib_index0 = (vnet_buffer (p0)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
fib_index1 = (vnet_buffer (p1)->sw_if_index[VLIB_TX] == (u32) ~ 0) ?
fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
lbi0 = ip6_fib_table_fwding_lookup (im, fib_index0, dst_addr0);
lbi1 = ip6_fib_table_fwding_lookup (im, fib_index1, dst_addr1);
lb0 = load_balance_get (lbi0);
lb1 = load_balance_get (lbi1);
vnet_buffer (p0)->ip.flow_hash = vnet_buffer (p1)->ip.flow_hash = 0;
if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
{
flow_hash_config0 = lb0->lb_hash_config;
vnet_buffer (p0)->ip.flow_hash =
ip6_compute_flow_hash (ip0, flow_hash_config0);
}
if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
{
flow_hash_config1 = lb1->lb_hash_config;
vnet_buffer (p1)->ip.flow_hash =
ip6_compute_flow_hash (ip1, flow_hash_config1);
}
ASSERT (lb0->lb_n_buckets > 0);
ASSERT (lb1->lb_n_buckets > 0);
ASSERT (is_pow2 (lb0->lb_n_buckets));
ASSERT (is_pow2 (lb1->lb_n_buckets));
dpo0 = load_balance_get_bucket_i (lb0,
(vnet_buffer (p0)->ip.flow_hash &
lb0->lb_n_buckets_minus_1));
dpo1 = load_balance_get_bucket_i (lb1,
(vnet_buffer (p1)->ip.flow_hash &
lb1->lb_n_buckets_minus_1));
next0 = dpo0->dpoi_next_node;
next1 = dpo1->dpoi_next_node;
/* Only process the HBH Option Header if explicitly configured to do so */
if (PREDICT_FALSE
(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
(ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
}
if (PREDICT_FALSE
(ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
(ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
}
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
vlib_increment_combined_counter
(cm, cpu_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
vlib_increment_combined_counter
(cm, cpu_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
from += 2;
to_next += 2;
n_left_to_next -= 2;
n_left_from -= 2;
wrong_next = (next0 != next) + 2 * (next1 != next);
if (PREDICT_FALSE (wrong_next != 0))
{
switch (wrong_next)
{
case 1:
/* A B A */
to_next[-2] = pi1;
to_next -= 1;
n_left_to_next += 1;
vlib_set_next_frame_buffer (vm, node, next0, pi0);
break;
case 2:
/* A A B */
to_next -= 1;
n_left_to_next += 1;
vlib_set_next_frame_buffer (vm, node, next1, pi1);
break;
case 3:
/* A B C */
to_next -= 2;
n_left_to_next += 2;
vlib_set_next_frame_buffer (vm, node, next0, pi0);
vlib_set_next_frame_buffer (vm, node, next1, pi1);
if (next0 == next1)
{
/* A B B */
vlib_put_next_frame (vm, node, next, n_left_to_next);
next = next1;
vlib_get_next_frame (vm, node, next, to_next,
n_left_to_next);
}
}
}
}
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *p0;
ip6_header_t *ip0;
u32 pi0, lbi0;
ip_lookup_next_t next0;
load_balance_t *lb0;
ip6_address_t *dst_addr0;
u32 fib_index0, flow_hash_config0;
const dpo_id_t *dpo0;
pi0 = from[0];
to_next[0] = pi0;
p0 = vlib_get_buffer (vm, pi0);
ip0 = vlib_buffer_get_current (p0);
dst_addr0 = &ip0->dst_address;
fib_index0 =
vec_elt (im->fib_index_by_sw_if_index,
vnet_buffer (p0)->sw_if_index[VLIB_RX]);
fib_index0 =
(vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
(u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
flow_hash_config0 = ip6_fib_get (fib_index0)->flow_hash_config;
lbi0 = ip6_fib_table_fwding_lookup (im, fib_index0, dst_addr0);
lb0 = load_balance_get (lbi0);
vnet_buffer (p0)->ip.flow_hash = 0;
if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
{
flow_hash_config0 = lb0->lb_hash_config;
vnet_buffer (p0)->ip.flow_hash =
ip6_compute_flow_hash (ip0, flow_hash_config0);
}
ASSERT (lb0->lb_n_buckets > 0);
ASSERT (is_pow2 (lb0->lb_n_buckets));
dpo0 = load_balance_get_bucket_i (lb0,
(vnet_buffer (p0)->ip.flow_hash &
lb0->lb_n_buckets_minus_1));
next0 = dpo0->dpoi_next_node;
/* Only process the HBH Option Header if explicitly configured to do so */
if (PREDICT_FALSE
(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
(ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
}
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
vlib_increment_combined_counter
(cm, cpu_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
from += 1;
to_next += 1;
n_left_to_next -= 1;
n_left_from -= 1;
if (PREDICT_FALSE (next0 != next))
{
n_left_to_next += 1;
vlib_put_next_frame (vm, node, next, n_left_to_next);
next = next0;
vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
to_next[0] = pi0;
to_next += 1;
n_left_to_next -= 1;
}
}
vlib_put_next_frame (vm, node, next, n_left_to_next);
}
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip6_forward_next_trace (vm, node, frame, VLIB_TX);
return frame->n_vectors;
}
static void
ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
ip6_main_t * im, u32 fib_index,
ip_interface_address_t * a)
{
ip_lookup_main_t *lm = &im->lookup_main;
ip6_address_t *address = ip_interface_address_get_address (lm, a);
fib_prefix_t pfx = {
.fp_len = a->address_length,
.fp_proto = FIB_PROTOCOL_IP6,
.fp_addr.ip6 = *address,
};
a->neighbor_probe_adj_index = ~0;
if (a->address_length < 128)
{
fib_node_index_t fei;
fei = fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_INTERFACE, (FIB_ENTRY_FLAG_CONNECTED | FIB_ENTRY_FLAG_ATTACHED), FIB_PROTOCOL_IP6, NULL, /* No next-hop address */
sw_if_index, ~0, // invalid FIB index
1, NULL, // no label stack
FIB_ROUTE_PATH_FLAG_NONE);
a->neighbor_probe_adj_index = fib_entry_get_adj (fei);
}
pfx.fp_len = 128;
if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
{
u32 classify_table_index =
lm->classify_table_index_by_sw_if_index[sw_if_index];
if (classify_table_index != (u32) ~ 0)
{
dpo_id_t dpo = DPO_INVALID;
dpo_set (&dpo,
DPO_CLASSIFY,
DPO_PROTO_IP6,
classify_dpo_create (DPO_PROTO_IP6, classify_table_index));
fib_table_entry_special_dpo_add (fib_index,
&pfx,
FIB_SOURCE_CLASSIFY,
FIB_ENTRY_FLAG_NONE, &dpo);
dpo_reset (&dpo);
}
}
fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_INTERFACE, (FIB_ENTRY_FLAG_CONNECTED | FIB_ENTRY_FLAG_LOCAL), FIB_PROTOCOL_IP6, &pfx.fp_addr, sw_if_index, ~0, // invalid FIB index
1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
}
static void
ip6_del_interface_routes (ip6_main_t * im,
u32 fib_index,
ip6_address_t * address, u32 address_length)
{
fib_prefix_t pfx = {
.fp_len = address_length,
.fp_proto = FIB_PROTOCOL_IP6,
.fp_addr.ip6 = *address,
};
if (pfx.fp_len < 128)
{
fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
}
pfx.fp_len = 128;
fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
}
void
ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
{
ip6_main_t *im = &ip6_main;
vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
/*
* enable/disable only on the 1<->0 transition
*/
if (is_enable)
{
if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
return;
}
else
{
/* The ref count is 0 when an address is removed from an interface that has
* no address - this is not a ciritical error */
if (0 == im->ip_enabled_by_sw_if_index[sw_if_index] ||
0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
return;
}
vnet_feature_enable_disable ("ip6-unicast", "ip6-lookup", sw_if_index,
is_enable, 0, 0);
vnet_feature_enable_disable ("ip6-multicast", "ip6-lookup", sw_if_index,
is_enable, 0, 0);
}
/* get first interface address */
ip6_address_t *
ip6_interface_first_address (ip6_main_t * im,
u32 sw_if_index,
ip_interface_address_t ** result_ia)
{
ip_lookup_main_t *lm = &im->lookup_main;
ip_interface_address_t *ia = 0;
ip6_address_t *result = 0;
/* *INDENT-OFF* */
foreach_ip_interface_address (lm, ia, sw_if_index,
1 /* honor unnumbered */,
({
ip6_address_t * a = ip_interface_address_get_address (lm, ia);
result = a;
break;
}));
/* *INDENT-ON* */
if (result_ia)
*result_ia = result ? ia : 0;
return result;
}
clib_error_t *
ip6_add_del_interface_address (vlib_main_t * vm,
u32 sw_if_index,
ip6_address_t * address,
u32 address_length, u32 is_del)
{
vnet_main_t *vnm = vnet_get_main ();
ip6_main_t *im = &ip6_main;
ip_lookup_main_t *lm = &im->lookup_main;
clib_error_t *error;
u32 if_address_index;
ip6_address_fib_t ip6_af, *addr_fib = 0;
vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
ip6_addr_fib_init (&ip6_af, address,
vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
vec_add1 (addr_fib, ip6_af);
{
uword elts_before = pool_elts (lm->if_address_pool);
error = ip_interface_address_add_del
(lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
if (error)
goto done;
/* Pool did not grow: add duplicate address. */
if (elts_before == pool_elts (lm->if_address_pool))
goto done;
}
ip6_sw_interface_enable_disable (sw_if_index, !is_del);
if (is_del)
ip6_del_interface_routes (im, ip6_af.fib_index, address, address_length);
else
ip6_add_interface_routes (vnm, sw_if_index,
im, ip6_af.fib_index,
pool_elt_at_index (lm->if_address_pool,
if_address_index));
{
ip6_add_del_interface_address_callback_t *cb;
vec_foreach (cb, im->add_del_interface_address_callbacks)
cb->function (im, cb->function_opaque, sw_if_index,
address, address_length, if_address_index, is_del);
}
done:
vec_free (addr_fib);
return error;
}
clib_error_t *
ip6_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
{
ip6_main_t *im = &ip6_main;
ip_interface_address_t *ia;
ip6_address_t *a;
u32 is_admin_up, fib_index;
/* Fill in lookup tables with default table (0). */
vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
vec_validate_init_empty (im->
lookup_main.if_address_pool_index_by_sw_if_index,
sw_if_index, ~0);
is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
/* *INDENT-OFF* */
foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
0 /* honor unnumbered */,
({
a = ip_interface_address_get_address (&im->lookup_main, ia);
if (is_admin_up)
ip6_add_interface_routes (vnm, sw_if_index,
im, fib_index,
ia);
else
ip6_del_interface_routes (im, fib_index,
a, ia->address_length);
}));
/* *INDENT-ON* */
return 0;
}
VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
/* Built-in ip6 unicast rx feature path definition */
/* *INDENT-OFF* */
VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
{
.arc_name = "ip6-unicast",
.start_nodes = VNET_FEATURES ("ip6-input"),
.arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
};
VNET_FEATURE_INIT (ip6_flow_classify, static) =
{
.arc_name = "ip6-unicast",
.node_name = "ip6-flow-classify",
.runs_before = VNET_FEATURES ("ip6-inacl"),
};
VNET_FEATURE_INIT (ip6_inacl, static) =
{
.arc_name = "ip6-unicast",
.node_name = "ip6-inacl",
.runs_before = VNET_FEATURES ("ip6-policer-classify"),
};
VNET_FEATURE_INIT (ip6_policer_classify, static) =
{
.arc_name = "ip6-unicast",
.node_name = "ip6-policer-classify",
.runs_before = VNET_FEATURES ("ipsec-input-ip6"),
};
VNET_FEATURE_INIT (ip6_ipsec, static) =
{
.arc_name = "ip6-unicast",
.node_name = "ipsec-input-ip6",
.runs_before = VNET_FEATURES ("l2tp-decap"),
};
VNET_FEATURE_INIT (ip6_l2tp, static) =
{
.arc_name = "ip6-unicast",
.node_name = "l2tp-decap",
.runs_before = VNET_FEATURES ("vpath-input-ip6"),
};
VNET_FEATURE_INIT (ip6_vpath, static) =
{
.arc_name = "ip6-unicast",
.node_name = "vpath-input-ip6",
.runs_before = VNET_FEATURES ("ip6-lookup"),
};
VNET_FEATURE_INIT (ip6_lookup, static) =
{
.arc_name = "ip6-unicast",
.node_name = "ip6-lookup",
.runs_before = VNET_FEATURES ("ip6-drop"),
};
VNET_FEATURE_INIT (ip6_drop, static) =
{
.arc_name = "ip6-unicast",
.node_name = "ip6-drop",
.runs_before = 0, /*last feature*/
};
/* Built-in ip6 multicast rx feature path definition (none now) */
VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
{
.arc_name = "ip6-multicast",
.start_nodes = VNET_FEATURES ("ip6-input"),
.arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
};
VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
.arc_name = "ip6-multicast",
.node_name = "vpath-input-ip6",
.runs_before = VNET_FEATURES ("ip6-lookup"),
};
VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
.arc_name = "ip6-multicast",
.node_name = "ip6-lookup",
.runs_before = VNET_FEATURES ("ip6-drop"),
};
VNET_FEATURE_INIT (ip6_drop_mc, static) = {
.arc_name = "ip6-multicast",
.node_name = "ip6-drop",
.runs_before = 0, /* last feature */
};
/* Built-in ip4 tx feature path definition */
VNET_FEATURE_ARC_INIT (ip6_output, static) =
{
.arc_name = "ip6-output",
.start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain"),
.arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
};
VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
.arc_name = "ip6-output",
.node_name = "ipsec-output-ip6",
.runs_before = VNET_FEATURES ("interface-output"),
};
VNET_FEATURE_INIT (ip6_interface_output, static) = {
.arc_name = "ip6-output",
.node_name = "interface-output",
.runs_before = 0, /* not before any other features */
};
/* *INDENT-ON* */
clib_error_t *
ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
{
vnet_feature_enable_disable ("ip6-unicast", "ip6-drop", sw_if_index,
is_add, 0, 0);
vnet_feature_enable_disable ("ip6-multicast", "ip6-drop", sw_if_index,
is_add, 0, 0);
vnet_feature_enable_disable ("ip6-output", "interface-output", sw_if_index,
is_add, 0, 0);
return /* no error */ 0;
}
VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
static uword
ip6_lookup (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip6_lookup_inline (vm, node, frame);
}
static u8 *format_ip6_lookup_trace (u8 * s, va_list * args);
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_lookup_node) =
{
.function = ip6_lookup,
.name = "ip6-lookup",
.vector_size = sizeof (u32),
.format_trace = format_ip6_lookup_trace,
.n_next_nodes = IP6_LOOKUP_N_NEXT,
.next_nodes = IP6_LOOKUP_NEXT_NODES,
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup);
always_inline uword
ip6_load_balance (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
u32 n_left_from, n_left_to_next, *from, *to_next;
ip_lookup_next_t next;
u32 cpu_index = os_get_cpu_number ();
ip6_main_t *im = &ip6_main;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next = node->cached_next_index;
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip6_forward_next_trace (vm, node, frame, VLIB_TX);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
ip_lookup_next_t next0, next1;
const load_balance_t *lb0, *lb1;
vlib_buffer_t *p0, *p1;
u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
const ip6_header_t *ip0, *ip1;
const dpo_id_t *dpo0, *dpo1;
/* 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, STORE);
vlib_prefetch_buffer_header (p3, STORE);
CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
}
pi0 = to_next[0] = from[0];
pi1 = to_next[1] = from[1];
from += 2;
n_left_from -= 2;
to_next += 2;
n_left_to_next -= 2;
p0 = vlib_get_buffer (vm, pi0);
p1 = vlib_get_buffer (vm, pi1);
ip0 = vlib_buffer_get_current (p0);
ip1 = vlib_buffer_get_current (p1);
lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
lb0 = load_balance_get (lbi0);
lb1 = load_balance_get (lbi1);
/*
* this node is for via FIBs we can re-use the hash value from the
* to node if present.
* We don't want to use the same hash value at each level in the recursion
* graph as that would lead to polarisation
*/
hc0 = vnet_buffer (p0)->ip.flow_hash = 0;
hc1 = vnet_buffer (p1)->ip.flow_hash = 0;
if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
{
if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
{
hc0 = vnet_buffer (p0)->ip.flow_hash =
vnet_buffer (p0)->ip.flow_hash >> 1;
}
else
{
hc0 = vnet_buffer (p0)->ip.flow_hash =
ip6_compute_flow_hash (ip0, hc0);
}
}
if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
{
if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
{
hc1 = vnet_buffer (p1)->ip.flow_hash =
vnet_buffer (p1)->ip.flow_hash >> 1;
}
else
{
hc1 = vnet_buffer (p1)->ip.flow_hash =
ip6_compute_flow_hash (ip1, hc1);
}
}
dpo0 =
load_balance_get_bucket_i (lb0,
hc0 & (lb0->lb_n_buckets_minus_1));
dpo1 =
load_balance_get_bucket_i (lb1,
hc1 & (lb1->lb_n_buckets_minus_1));
next0 = dpo0->dpoi_next_node;
next1 = dpo1->dpoi_next_node;
/* Only process the HBH Option Header if explicitly configured to do so */
if (PREDICT_FALSE
(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
(ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
}
/* Only process the HBH Option Header if explicitly configured to do so */
if (PREDICT_FALSE
(ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
(ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
}
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
vlib_increment_combined_counter
(cm, cpu_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
vlib_increment_combined_counter
(cm, cpu_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
vlib_validate_buffer_enqueue_x2 (vm, node, next,
to_next, n_left_to_next,
pi0, pi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
ip_lookup_next_t next0;
const load_balance_t *lb0;
vlib_buffer_t *p0;
u32 pi0, lbi0, hc0;
const ip6_header_t *ip0;
const dpo_id_t *dpo0;
pi0 = from[0];
to_next[0] = pi0;
from += 1;
to_next += 1;
n_left_to_next -= 1;
n_left_from -= 1;
p0 = vlib_get_buffer (vm, pi0);
ip0 = vlib_buffer_get_current (p0);
lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
lb0 = load_balance_get (lbi0);
hc0 = vnet_buffer (p0)->ip.flow_hash = 0;
if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
{
if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
{
hc0 = vnet_buffer (p0)->ip.flow_hash =
vnet_buffer (p0)->ip.flow_hash >> 1;
}
else
{
hc0 = vnet_buffer (p0)->ip.flow_hash =
ip6_compute_flow_hash (ip0, hc0);
}
}
dpo0 =
load_balance_get_bucket_i (lb0,
hc0 & (lb0->lb_n_buckets_minus_1));
next0 = dpo0->dpoi_next_node;
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
/* Only process the HBH Option Header if explicitly configured to do so */
if (PREDICT_FALSE
(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
(ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
}
vlib_increment_combined_counter
(cm, cpu_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
vlib_validate_buffer_enqueue_x1 (vm, node, next,
to_next, n_left_to_next,
pi0, next0);
}
vlib_put_next_frame (vm, node, next, n_left_to_next);
}
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_load_balance_node) =
{
.function = ip6_load_balance,
.name = "ip6-load-balance",
.vector_size = sizeof (u32),
.sibling_of = "ip6-lookup",
.format_trace = format_ip6_lookup_trace,
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_load_balance_node, ip6_load_balance);
typedef struct
{
/* Adjacency taken. */
u32 adj_index;
u32 flow_hash;
u32 fib_index;
/* Packet data, possibly *after* rewrite. */
u8 packet_data[128 - 1 * sizeof (u32)];
}
ip6_forward_next_trace_t;
static u8 *
format_ip6_forward_next_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 *);
ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
uword indent = format_get_indent (s);
s = format (s, "%U%U",
format_white_space, indent,
format_ip6_header, t->packet_data, sizeof (t->packet_data));
return s;
}
static u8 *
format_ip6_lookup_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 *);
ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
uword indent = format_get_indent (s);
s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
t->fib_index, t->adj_index, t->flow_hash);
s = format (s, "\n%U%U",
format_white_space, indent,
format_ip6_header, t->packet_data, sizeof (t->packet_data));
return s;
}
static u8 *
format_ip6_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 *);
ip6_forward_next_trace_t *t = va_arg (*args, ip6_forward_next_trace_t *);
vnet_main_t *vnm = vnet_get_main ();
uword indent = format_get_indent (s);
s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
t->fib_index, t->adj_index, format_ip_adjacency,
t->adj_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
s = format (s, "\n%U%U",
format_white_space, indent,
format_ip_adjacency_packet_data,
vnm, t->adj_index, t->packet_data, sizeof (t->packet_data));
return s;
}
/* Common trace function for all ip6-forward next nodes. */
void
ip6_forward_next_trace (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
{
u32 *from, n_left;
ip6_main_t *im = &ip6_main;
n_left = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left >= 4)
{
u32 bi0, bi1;
vlib_buffer_t *b0, *b1;
ip6_forward_next_trace_t *t0, *t1;
/* Prefetch next iteration. */
vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
bi0 = from[0];
bi1 = from[1];
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
if (b0->flags & VLIB_BUFFER_IS_TRACED)
{
t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
t0->fib_index =
(vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
(u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
vec_elt (im->fib_index_by_sw_if_index,
vnet_buffer (b0)->sw_if_index[VLIB_RX]);
clib_memcpy (t0->packet_data,
vlib_buffer_get_current (b0),
sizeof (t0->packet_data));
}
if (b1->flags & VLIB_BUFFER_IS_TRACED)
{
t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
t1->fib_index =
(vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
(u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
vec_elt (im->fib_index_by_sw_if_index,
vnet_buffer (b1)->sw_if_index[VLIB_RX]);
clib_memcpy (t1->packet_data,
vlib_buffer_get_current (b1),
sizeof (t1->packet_data));
}
from += 2;
n_left -= 2;
}
while (n_left >= 1)
{
u32 bi0;
vlib_buffer_t *b0;
ip6_forward_next_trace_t *t0;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
if (b0->flags & VLIB_BUFFER_IS_TRACED)
{
t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
t0->fib_index =
(vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
(u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
vec_elt (im->fib_index_by_sw_if_index,
vnet_buffer (b0)->sw_if_index[VLIB_RX]);
clib_memcpy (t0->packet_data,
vlib_buffer_get_current (b0),
sizeof (t0->packet_data));
}
from += 1;
n_left -= 1;
}
}
static uword
ip6_drop_or_punt (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, ip6_error_t error_code)
{
u32 *buffers = vlib_frame_vector_args (frame);
uword n_packets = frame->n_vectors;
vlib_error_drop_buffers (vm, node, buffers,
/* stride */ 1,
n_packets,
/* next */ 0,
ip6_input_node.index, error_code);
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip6_forward_next_trace (vm, node, frame, VLIB_TX);
return n_packets;
}
static uword
ip6_drop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_DROP);
}
static uword
ip6_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_PUNT);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_drop_node, static) =
{
.function = ip6_drop,
.name = "ip6-drop",
.vector_size = sizeof (u32),
.format_trace = format_ip6_forward_next_trace,
.n_next_nodes = 1,
.next_nodes =
{
[0] = "error-drop",},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_drop_node, ip6_drop);
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_punt_node, static) =
{
.function = ip6_punt,
.name = "ip6-punt",
.vector_size = sizeof (u32),
.format_trace = format_ip6_forward_next_trace,
.n_next_nodes = 1,
.next_nodes =
{
[0] = "error-punt",},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_punt_node, ip6_punt);
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_multicast_node, static) =
{
.function = ip6_drop,
.name = "ip6-multicast",
.vector_size = sizeof (u32),
.format_trace = format_ip6_forward_next_trace,
.n_next_nodes = 1,
.next_nodes =
{
[0] = "error-drop",
},
};
/* *INDENT-ON* */
/* Compute TCP/UDP/ICMP6 checksum in software. */
u16
ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
ip6_header_t * ip0, int *bogus_lengthp)
{
ip_csum_t sum0;
u16 sum16, payload_length_host_byte_order;
u32 i, n_this_buffer, n_bytes_left;
u32 headers_size = sizeof (ip0[0]);
void *data_this_buffer;
ASSERT (bogus_lengthp);
*bogus_lengthp = 0;
/* Initialize checksum with ip header. */
sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
data_this_buffer = (void *) (ip0 + 1);
for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
{
sum0 = ip_csum_with_carry (sum0,
clib_mem_unaligned (&ip0->
src_address.as_uword[i],
uword));
sum0 =
ip_csum_with_carry (sum0,
clib_mem_unaligned (&ip0->dst_address.as_uword[i],
uword));
}
/* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
u32 skip_bytes;
ip6_hop_by_hop_ext_t *ext_hdr =
(ip6_hop_by_hop_ext_t *) data_this_buffer;
/* validate really icmp6 next */
ASSERT (ext_hdr->next_hdr == IP_PROTOCOL_ICMP6);
skip_bytes = 8 * (1 + ext_hdr->n_data_u64s);
data_this_buffer = (void *) ((u8 *) data_this_buffer + skip_bytes);
payload_length_host_byte_order -= skip_bytes;
headers_size += skip_bytes;
}
n_bytes_left = n_this_buffer = payload_length_host_byte_order;
if (p0 && n_this_buffer + headers_size > p0->current_length)
n_this_buffer =
p0->current_length >
headers_size ? p0->current_length - headers_size : 0;
while (1)
{
sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
n_bytes_left -= n_this_buffer;
if (n_bytes_left == 0)
break;
if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
{
*bogus_lengthp = 1;
return 0xfefe;
}
p0 = vlib_get_buffer (vm, p0->next_buffer);
data_this_buffer = vlib_buffer_get_current (p0);
n_this_buffer = p0->current_length;
}
sum16 = ~ip_csum_fold (sum0);
return sum16;
}
u32
ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
{
ip6_header_t *ip0 = vlib_buffer_get_current (p0);
udp_header_t *udp0;
u16 sum16;
int bogus_length;
/* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
ASSERT (ip0->protocol == IP_PROTOCOL_TCP
|| ip0->protocol == IP_PROTOCOL_ICMP6
|| ip0->protocol == IP_PROTOCOL_UDP
|| ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
udp0 = (void *) (ip0 + 1);
if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
{
p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
| IP_BUFFER_L4_CHECKSUM_CORRECT);
return p0->flags;
}
sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
| ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
return p0->flags;
}
/* ip6_locate_header
*
* This function is to search for the header specified by the find_hdr number.
* 1. If the find_hdr < 0 then it finds and returns the protocol number and
* offset stored in *offset of the transport or ESP header in the chain if
* found.
* 2. If a header with find_hdr > 0 protocol number is found then the
* offset is stored in *offset and protocol number of the header is
* returned.
* 3. If find_hdr header is not found or packet is malformed or
* it is a non-first fragment -1 is returned.
*/
always_inline int
ip6_locate_header (vlib_buffer_t * p0,
ip6_header_t * ip0, int find_hdr, u32 * offset)
{
u8 next_proto = ip0->protocol;
u8 *next_header;
u8 done = 0;
u32 cur_offset;
u8 *temp_nxthdr = 0;
u32 exthdr_len = 0;
next_header = ip6_next_header (ip0);
cur_offset = sizeof (ip6_header_t);
while (1)
{
done = (next_proto == find_hdr);
if (PREDICT_FALSE
(next_header >=
(u8 *) vlib_buffer_get_current (p0) + p0->current_length))
{
//A malicious packet could set an extension header with a too big size
return (-1);
}
if (done)
break;
if ((!ip6_ext_hdr (next_proto)) || next_proto == IP_PROTOCOL_IP6_NONXT)
{
if (find_hdr < 0)
break;
return -1;
}
if (next_proto == IP_PROTOCOL_IPV6_FRAGMENTATION)
{
ip6_frag_hdr_t *frag_hdr = (ip6_frag_hdr_t *) next_header;
u16 frag_off = ip6_frag_hdr_offset (frag_hdr);
/* Non first fragment return -1 */
if (frag_off)
return (-1);
exthdr_len = sizeof (ip6_frag_hdr_t);
temp_nxthdr = next_header + exthdr_len;
}
else if (next_proto == IP_PROTOCOL_IPSEC_AH)
{
exthdr_len =
ip6_ext_authhdr_len (((ip6_ext_header_t *) next_header));
temp_nxthdr = next_header + exthdr_len;
}
else
{
exthdr_len =
ip6_ext_header_len (((ip6_ext_header_t *) next_header));
temp_nxthdr = next_header + exthdr_len;
}
next_proto = ((ip6_ext_header_t *) next_header)->next_hdr;
next_header = temp_nxthdr;
cur_offset += exthdr_len;
}
*offset = cur_offset;
return (next_proto);
}
static uword
ip6_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
ip6_main_t *im = &ip6_main;
ip_lookup_main_t *lm = &im->lookup_main;
ip_local_next_t next_index;
u32 *from, *to_next, n_left_from, n_left_to_next;
vlib_node_runtime_t *error_node =
vlib_node_get_runtime (vm, ip6_input_node.index);
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip6_forward_next_trace (vm, node, frame, VLIB_TX);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
vlib_buffer_t *p0, *p1;
ip6_header_t *ip0, *ip1;
udp_header_t *udp0, *udp1;
u32 pi0, ip_len0, udp_len0, flags0, next0;
u32 pi1, ip_len1, udp_len1, flags1, next1;
i32 len_diff0, len_diff1;
u8 error0, type0, good_l4_checksum0;
u8 error1, type1, good_l4_checksum1;
u32 udp_offset0, udp_offset1;
pi0 = to_next[0] = from[0];
pi1 = to_next[1] = from[1];
from += 2;
n_left_from -= 2;
to_next += 2;
n_left_to_next -= 2;
p0 = vlib_get_buffer (vm, pi0);
p1 = vlib_get_buffer (vm, pi1);
ip0 = vlib_buffer_get_current (p0);
ip1 = vlib_buffer_get_current (p1);
vnet_buffer (p0)->ip.start_of_ip_header = p0->current_data;
vnet_buffer (p1)->ip.start_of_ip_header = p1->current_data;
type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
type1 = lm->builtin_protocol_by_ip_protocol[ip1->protocol];
next0 = lm->local_next_by_ip_protocol[ip0->protocol];
next1 = lm->local_next_by_ip_protocol[ip1->protocol];
flags0 = p0->flags;
flags1 = p1->flags;
good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
good_l4_checksum1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
len_diff0 = 0;
len_diff1 = 0;
/* Skip HBH local processing */
if (PREDICT_FALSE
(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
ip6_hop_by_hop_ext_t *ext_hdr =
(ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
next0 = lm->local_next_by_ip_protocol[ext_hdr->next_hdr];
type0 = lm->builtin_protocol_by_ip_protocol[ext_hdr->next_hdr];
}
if (PREDICT_FALSE
(ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
ip6_hop_by_hop_ext_t *ext_hdr =
(ip6_hop_by_hop_ext_t *) ip6_next_header (ip1);
next1 = lm->local_next_by_ip_protocol[ext_hdr->next_hdr];
type1 = lm->builtin_protocol_by_ip_protocol[ext_hdr->next_hdr];
}
if (PREDICT_TRUE (IP_PROTOCOL_UDP == ip6_locate_header (p0, ip0,
IP_PROTOCOL_UDP,
&udp_offset0)))
{
udp0 = (udp_header_t *) ((u8 *) ip0 + udp_offset0);
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP
&& udp0->checksum == 0;
/* Verify UDP length. */
ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
len_diff0 = ip_len0 - udp_len0;
}
if (PREDICT_TRUE (IP_PROTOCOL_UDP == ip6_locate_header (p1, ip1,
IP_PROTOCOL_UDP,
&udp_offset1)))
{
udp1 = (udp_header_t *) ((u8 *) ip1 + udp_offset1);
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UDP
&& udp1->checksum == 0;
/* Verify UDP length. */
ip_len1 = clib_net_to_host_u16 (ip1->payload_length);
udp_len1 = clib_net_to_host_u16 (udp1->length);
len_diff1 = ip_len1 - udp_len1;
}
good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UNKNOWN;
len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
len_diff1 = type1 == IP_BUILTIN_PROTOCOL_UDP ? len_diff1 : 0;
if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
&& !good_l4_checksum0
&& !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
{
flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
good_l4_checksum0 =
(flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
}
if (PREDICT_FALSE (type1 != IP_BUILTIN_PROTOCOL_UNKNOWN
&& !good_l4_checksum1
&& !(flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
{
flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, p1);
good_l4_checksum1 =
(flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
}
error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
error1 = len_diff1 < 0 ? IP6_ERROR_UDP_LENGTH : error1;
ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
IP6_ERROR_UDP_CHECKSUM);
ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
IP6_ERROR_ICMP_CHECKSUM);
error0 =
(!good_l4_checksum0 ? IP6_ERROR_UDP_CHECKSUM + type0 : error0);
error1 =
(!good_l4_checksum1 ? IP6_ERROR_UDP_CHECKSUM + type1 : error1);
/* Drop packets from unroutable hosts. */
/* If this is a neighbor solicitation (ICMP), skip source RPF check */
if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
type0 != IP_BUILTIN_PROTOCOL_ICMP &&
!ip6_address_is_link_local_unicast (&ip0->src_address))
{
u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
error0 = (ADJ_INDEX_INVALID == src_adj_index0
? IP6_ERROR_SRC_LOOKUP_MISS : error0);
}
if (error1 == IP6_ERROR_UNKNOWN_PROTOCOL &&
type1 != IP_BUILTIN_PROTOCOL_ICMP &&
!ip6_address_is_link_local_unicast (&ip1->src_address))
{
u32 src_adj_index1 = ip6_src_lookup_for_packet (im, p1, ip1);
error1 = (ADJ_INDEX_INVALID == src_adj_index1
? IP6_ERROR_SRC_LOOKUP_MISS : error1);
}
next0 =
error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
next1 =
error1 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
p0->error = error_node->errors[error0];
p1->error = error_node->errors[error1];
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
pi0, pi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *p0;
ip6_header_t *ip0;
udp_header_t *udp0;
u32 pi0, ip_len0, udp_len0, flags0, next0;
i32 len_diff0;
u8 error0, type0, good_l4_checksum0;
u32 udp_offset0;
pi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
p0 = vlib_get_buffer (vm, pi0);
ip0 = vlib_buffer_get_current (p0);
vnet_buffer (p0)->ip.start_of_ip_header = p0->current_data;
type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
next0 = lm->local_next_by_ip_protocol[ip0->protocol];
flags0 = p0->flags;
good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
len_diff0 = 0;
/* Skip HBH local processing */
if (PREDICT_FALSE
(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
{
ip6_hop_by_hop_ext_t *ext_hdr =
(ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
next0 = lm->local_next_by_ip_protocol[ext_hdr->next_hdr];
type0 = lm->builtin_protocol_by_ip_protocol[ext_hdr->next_hdr];
}
if (PREDICT_TRUE (IP_PROTOCOL_UDP == ip6_locate_header (p0, ip0,
IP_PROTOCOL_UDP,
&udp_offset0)))
{
udp0 = (udp_header_t *) ((u8 *) ip0 + udp_offset0);
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP
&& udp0->checksum == 0;
/* Verify UDP length. */
ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
len_diff0 = ip_len0 - udp_len0;
}
good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
&& !good_l4_checksum0
&& !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
{
flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
good_l4_checksum0 =
(flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
}
error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP ==
IP6_ERROR_UDP_CHECKSUM);
ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP ==
IP6_ERROR_ICMP_CHECKSUM);
error0 =
(!good_l4_checksum0 ? IP6_ERROR_UDP_CHECKSUM + type0 : error0);
/* If this is a neighbor solicitation (ICMP), skip source RPF check */
if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
type0 != IP_BUILTIN_PROTOCOL_ICMP &&
!ip6_address_is_link_local_unicast (&ip0->src_address))
{
u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
error0 = (ADJ_INDEX_INVALID == src_adj_index0
? IP6_ERROR_SRC_LOOKUP_MISS : error0);
}
next0 =
error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
p0->error = error_node->errors[error0];
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
pi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_local_node, static) =
{
.function = ip6_local,
.name = "ip6-local",
.vector_size = sizeof (u32),
.format_trace = format_ip6_forward_next_trace,
.n_next_nodes = IP_LOCAL_N_NEXT,
.next_nodes =
{
[IP_LOCAL_NEXT_DROP] = "error-drop",
[IP_LOCAL_NEXT_PUNT] = "error-punt",
[IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
[IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local);
void
ip6_register_protocol (u32 protocol, u32 node_index)
{
vlib_main_t *vm = vlib_get_main ();
ip6_main_t *im = &ip6_main;
ip_lookup_main_t *lm = &im->lookup_main;
ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
lm->local_next_by_ip_protocol[protocol] =
vlib_node_add_next (vm, ip6_local_node.index, node_index);
}
typedef enum
{
IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
IP6_DISCOVER_NEIGHBOR_N_NEXT,
} ip6_discover_neighbor_next_t;
typedef enum
{
IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS,
} ip6_discover_neighbor_error_t;
static uword
ip6_discover_neighbor_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, int is_glean)
{
vnet_main_t *vnm = vnet_get_main ();
ip6_main_t *im = &ip6_main;
ip_lookup_main_t *lm = &im->lookup_main;
u32 *from, *to_next_drop;
uword n_left_from, n_left_to_next_drop;
static f64 time_last_seed_change = -1e100;
static u32 hash_seeds[3];
static uword hash_bitmap[256 / BITS (uword)];
f64 time_now;
int bogus_length;
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip6_forward_next_trace (vm, node, frame, VLIB_TX);
time_now = vlib_time_now (vm);
if (time_now - time_last_seed_change > 1e-3)
{
uword i;
u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
sizeof (hash_seeds));
for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
hash_seeds[i] = r[i];
/* Mark all hash keys as been not-seen before. */
for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
hash_bitmap[i] = 0;
time_last_seed_change = time_now;
}
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
to_next_drop, n_left_to_next_drop);
while (n_left_from > 0 && n_left_to_next_drop > 0)
{
vlib_buffer_t *p0;
ip6_header_t *ip0;
u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
uword bm0;
ip_adjacency_t *adj0;
vnet_hw_interface_t *hw_if0;
u32 next0;
pi0 = from[0];
p0 = vlib_get_buffer (vm, pi0);
adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
ip0 = vlib_buffer_get_current (p0);
adj0 = ip_get_adjacency (lm, adj_index0);
if (!is_glean)
{
ip0->dst_address.as_u64[0] =
adj0->sub_type.nbr.next_hop.ip6.as_u64[0];
ip0->dst_address.as_u64[1] =
adj0->sub_type.nbr.next_hop.ip6.as_u64[1];
}
a0 = hash_seeds[0];
b0 = hash_seeds[1];
c0 = hash_seeds[2];
sw_if_index0 = adj0->rewrite_header.sw_if_index;
vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
a0 ^= sw_if_index0;
b0 ^= ip0->dst_address.as_u32[0];
c0 ^= ip0->dst_address.as_u32[1];
hash_v3_mix32 (a0, b0, c0);
b0 ^= ip0->dst_address.as_u32[2];
c0 ^= ip0->dst_address.as_u32[3];
hash_v3_finalize32 (a0, b0, c0);
c0 &= BITS (hash_bitmap) - 1;
c0 = c0 / BITS (uword);
m0 = (uword) 1 << (c0 % BITS (uword));
bm0 = hash_bitmap[c0];
drop0 = (bm0 & m0) != 0;
/* Mark it as seen. */
hash_bitmap[c0] = bm0 | m0;
from += 1;
n_left_from -= 1;
to_next_drop[0] = pi0;
to_next_drop += 1;
n_left_to_next_drop -= 1;
hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
/* If the interface is link-down, drop the pkt */
if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
drop0 = 1;
p0->error =
node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
: IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
if (drop0)
continue;
/*
* the adj has been updated to a rewrite but the node the DPO that got
* us here hasn't - yet. no big deal. we'll drop while we wait.
*/
if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
continue;
{
u32 bi0 = 0;
icmp6_neighbor_solicitation_header_t *h0;
vlib_buffer_t *b0;
h0 = vlib_packet_template_get_packet
(vm, &im->discover_neighbor_packet_template, &bi0);
/*
* Build ethernet header.
* Choose source address based on destination lookup
* adjacency.
*/
if (ip6_src_address_for_packet (lm,
sw_if_index0,
&h0->ip.src_address))
{
/* There is no address on the interface */
p0->error =
node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS];
vlib_buffer_free (vm, &bi0, 1);
continue;
}
/*
* Destination address is a solicited node multicast address.
* We need to fill in
* the low 24 bits with low 24 bits of target's address.
*/
h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
h0->neighbor.target_address = ip0->dst_address;
clib_memcpy (h0->link_layer_option.ethernet_address,
hw_if0->hw_address, vec_len (hw_if0->hw_address));
/* $$$$ appears we need this; why is the checksum non-zero? */
h0->neighbor.icmp.checksum = 0;
h0->neighbor.icmp.checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
&bogus_length);
ASSERT (bogus_length == 0);
vlib_buffer_copy_trace_flag (vm, p0, bi0);
b0 = vlib_get_buffer (vm, bi0);
vnet_buffer (b0)->sw_if_index[VLIB_TX]
= vnet_buffer (p0)->sw_if_index[VLIB_TX];
/* Add rewrite/encap string. */
vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
vlib_set_next_frame_buffer (vm, node, next0, bi0);
}
}
vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
n_left_to_next_drop);
}
return frame->n_vectors;
}
static uword
ip6_discover_neighbor (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return (ip6_discover_neighbor_inline (vm, node, frame, 0));
}
static uword
ip6_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return (ip6_discover_neighbor_inline (vm, node, frame, 1));
}
static char *ip6_discover_neighbor_error_strings[] = {
[IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
[IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT] = "neighbor solicitations sent",
[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]
= "no source address for ND solicitation",
};
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_discover_neighbor_node) =
{
.function = ip6_discover_neighbor,
.name = "ip6-discover-neighbor",
.vector_size = sizeof (u32),
.format_trace = format_ip6_forward_next_trace,
.n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
.error_strings = ip6_discover_neighbor_error_strings,
.n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
.next_nodes =
{
[IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop",
[IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output",
},
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_glean_node) =
{
.function = ip6_glean,
.name = "ip6-glean",
.vector_size = sizeof (u32),
.format_trace = format_ip6_forward_next_trace,
.n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
.error_strings = ip6_discover_neighbor_error_strings,
.n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
.next_nodes =
{
[IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop",
[IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output",
},
};
/* *INDENT-ON* */
clib_error_t *
ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index)
{
vnet_main_t *vnm = vnet_get_main ();
ip6_main_t *im = &ip6_main;
icmp6_neighbor_solicitation_header_t *h;
ip6_address_t *src;
ip_interface_address_t *ia;
ip_adjacency_t *adj;
vnet_hw_interface_t *hi;
vnet_sw_interface_t *si;
vlib_buffer_t *b;
u32 bi = 0;
int bogus_length;
si = vnet_get_sw_interface (vnm, sw_if_index);
if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
{
return clib_error_return (0, "%U: interface %U down",
format_ip6_address, dst,
format_vnet_sw_if_index_name, vnm,
sw_if_index);
}
src =
ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
if (!src)
{
vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
return clib_error_return
(0, "no matching interface address for destination %U (interface %U)",
format_ip6_address, dst,
format_vnet_sw_if_index_name, vnm, sw_if_index);
}
h =
vlib_packet_template_get_packet (vm,
&im->discover_neighbor_packet_template,
&bi);
hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
/* Destination address is a solicited node multicast address. We need to fill in
the low 24 bits with low 24 bits of target's address. */
h->ip.dst_address.as_u8[13] = dst->as_u8[13];
h->ip.dst_address.as_u8[14] = dst->as_u8[14];
h->ip.dst_address.as_u8[15] = dst->as_u8[15];
h->ip.src_address = src[0];
h->neighbor.target_address = dst[0];
clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address,
vec_len (hi->hw_address));
h->neighbor.icmp.checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
ASSERT (bogus_length == 0);
b = vlib_get_buffer (vm, bi);
vnet_buffer (b)->sw_if_index[VLIB_RX] =
vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
/* Add encapsulation string for software interface (e.g. ethernet header). */
adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
{
vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
u32 *to_next = vlib_frame_vector_args (f);
to_next[0] = bi;
f->n_vectors = 1;
vlib_put_frame_to_node (vm, hi->output_node_index, f);
}
return /* no error */ 0;
}
typedef enum
{
IP6_REWRITE_NEXT_DROP,
IP6_REWRITE_NEXT_ICMP_ERROR,
} ip6_rewrite_next_t;
always_inline uword
ip6_rewrite_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, int is_midchain)
{
ip_lookup_main_t *lm = &ip6_main.lookup_main;
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index;
vlib_node_runtime_t *error_node =
vlib_node_get_runtime (vm, ip6_input_node.index);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
u32 cpu_index = os_get_cpu_number ();
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
ip_adjacency_t *adj0, *adj1;
vlib_buffer_t *p0, *p1;
ip6_header_t *ip0, *ip1;
u32 pi0, rw_len0, next0, error0, adj_index0;
u32 pi1, rw_len1, next1, error1, adj_index1;
u32 tx_sw_if_index0, tx_sw_if_index1;
/* 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->pre_data, 32, STORE);
CLIB_PREFETCH (p3->pre_data, 32, STORE);
CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
}
pi0 = to_next[0] = from[0];
pi1 = to_next[1] = from[1];
from += 2;
n_left_from -= 2;
to_next += 2;
n_left_to_next -= 2;
p0 = vlib_get_buffer (vm, pi0);
p1 = vlib_get_buffer (vm, pi1);
adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
/* We should never rewrite a pkt using the MISS adjacency */
ASSERT (adj_index0 && adj_index1);
ip0 = vlib_buffer_get_current (p0);
ip1 = vlib_buffer_get_current (p1);
error0 = error1 = IP6_ERROR_NONE;
next0 = next1 = IP6_REWRITE_NEXT_DROP;
if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
{
i32 hop_limit0 = ip0->hop_limit;
/* Input node should have reject packets with hop limit 0. */
ASSERT (ip0->hop_limit > 0);
hop_limit0 -= 1;
ip0->hop_limit = hop_limit0;
/*
* If the hop count drops below 1 when forwarding, generate
* an ICMP response.
*/
if (PREDICT_FALSE (hop_limit0 <= 0))
{
error0 = IP6_ERROR_TIME_EXPIRED;
next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
ICMP6_time_exceeded_ttl_exceeded_in_transit,
0);
}
}
else
{
p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
}
if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
{
i32 hop_limit1 = ip1->hop_limit;
/* Input node should have reject packets with hop limit 0. */
ASSERT (ip1->hop_limit > 0);
hop_limit1 -= 1;
ip1->hop_limit = hop_limit1;
/*
* If the hop count drops below 1 when forwarding, generate
* an ICMP response.
*/
if (PREDICT_FALSE (hop_limit1 <= 0))
{
error1 = IP6_ERROR_TIME_EXPIRED;
next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
ICMP6_time_exceeded_ttl_exceeded_in_transit,
0);
}
}
else
{
p1->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
}
adj0 = ip_get_adjacency (lm, adj_index0);
adj1 = ip_get_adjacency (lm, adj_index1);
rw_len0 = adj0[0].rewrite_header.data_bytes;
rw_len1 = adj1[0].rewrite_header.data_bytes;
vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
vlib_increment_combined_counter
(&adjacency_counters,
cpu_index,
adj_index0, 1, vlib_buffer_length_in_chain (vm, p0) + rw_len0);
vlib_increment_combined_counter
(&adjacency_counters,
cpu_index, adj_index1,
1, vlib_buffer_length_in_chain (vm, p1) + rw_len1);
/* Check MTU of outgoing interface. */
error0 =
(vlib_buffer_length_in_chain (vm, p0) >
adj0[0].
rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED :
error0);
error1 =
(vlib_buffer_length_in_chain (vm, p1) >
adj1[0].
rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED :
error1);
/* Don't adjust the buffer for hop count issue; icmp-error node
* wants to see the IP headerr */
if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
{
p0->current_data -= rw_len0;
p0->current_length += rw_len0;
tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
next0 = adj0[0].rewrite_header.next_index;
vnet_feature_arc_start (lm->output_feature_arc_index,
tx_sw_if_index0, &next0, p0);
}
if (PREDICT_TRUE (error1 == IP6_ERROR_NONE))
{
p1->current_data -= rw_len1;
p1->current_length += rw_len1;
tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
next1 = adj1[0].rewrite_header.next_index;
vnet_feature_arc_start (lm->output_feature_arc_index,
tx_sw_if_index1, &next1, p1);
}
/* Guess we are only writing on simple Ethernet header. */
vnet_rewrite_two_headers (adj0[0], adj1[0],
ip0, ip1, sizeof (ethernet_header_t));
if (is_midchain)
{
adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
}
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
pi0, pi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
ip_adjacency_t *adj0;
vlib_buffer_t *p0;
ip6_header_t *ip0;
u32 pi0, rw_len0;
u32 adj_index0, next0, error0;
u32 tx_sw_if_index0;
pi0 = to_next[0] = from[0];
p0 = vlib_get_buffer (vm, pi0);
adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
/* We should never rewrite a pkt using the MISS adjacency */
ASSERT (adj_index0);
adj0 = ip_get_adjacency (lm, adj_index0);
ip0 = vlib_buffer_get_current (p0);
error0 = IP6_ERROR_NONE;
next0 = IP6_REWRITE_NEXT_DROP;
/* Check hop limit */
if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
{
i32 hop_limit0 = ip0->hop_limit;
ASSERT (ip0->hop_limit > 0);
hop_limit0 -= 1;
ip0->hop_limit = hop_limit0;
if (PREDICT_FALSE (hop_limit0 <= 0))
{
/*
* If the hop count drops below 1 when forwarding, generate
* an ICMP response.
*/
error0 = IP6_ERROR_TIME_EXPIRED;
next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
ICMP6_time_exceeded_ttl_exceeded_in_transit,
0);
}
}
else
{
p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
}
/* Guess we are only writing on simple Ethernet header. */
vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
/* Update packet buffer attributes/set output interface. */
rw_len0 = adj0[0].rewrite_header.data_bytes;
vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
vlib_increment_combined_counter
(&adjacency_counters,
cpu_index,
adj_index0, 1, vlib_buffer_length_in_chain (vm, p0) + rw_len0);
/* Check MTU of outgoing interface. */
error0 =
(vlib_buffer_length_in_chain (vm, p0) >
adj0[0].
rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED :
error0);
/* Don't adjust the buffer for hop count issue; icmp-error node
* wants to see the IP headerr */
if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
{
p0->current_data -= rw_len0;
p0->current_length += rw_len0;
tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
next0 = adj0[0].rewrite_header.next_index;
vnet_feature_arc_start (lm->output_feature_arc_index,
tx_sw_if_index0, &next0, p0);
}
if (is_midchain)
{
adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
}
p0->error = error_node->errors[error0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
pi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Need to do trace after rewrites to pick up new packet data. */
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip6_forward_next_trace (vm, node, frame, VLIB_TX);
return frame->n_vectors;
}
static uword
ip6_rewrite (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip6_rewrite_inline (vm, node, frame,
/* midchain */ 0);
}
static uword
ip6_midchain (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip6_rewrite_inline (vm, node, frame,
/* midchain */ 1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_midchain_node) =
{
.function = ip6_midchain,
.name = "ip6-midchain",
.vector_size = sizeof (u32),
.format_trace = format_ip6_forward_next_trace,
.sibling_of = "ip6-rewrite",
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_midchain_node, ip6_midchain);
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_rewrite_node) =
{
.function = ip6_rewrite,
.name = "ip6-rewrite",
.vector_size = sizeof (u32),
.format_trace = format_ip6_rewrite_trace,
.n_next_nodes = 2,
.next_nodes =
{
[IP6_REWRITE_NEXT_DROP] = "error-drop",
[IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite);
/*
* Hop-by-Hop handling
*/
ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
#define foreach_ip6_hop_by_hop_error \
_(PROCESSED, "pkts with ip6 hop-by-hop options") \
_(FORMAT, "incorrectly formatted hop-by-hop options") \
_(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
typedef enum
{
#define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
foreach_ip6_hop_by_hop_error
#undef _
IP6_HOP_BY_HOP_N_ERROR,
} ip6_hop_by_hop_error_t;
/*
* Primary h-b-h handler trace support
* We work pretty hard on the problem for obvious reasons
*/
typedef struct
{
u32 next_index;
u32 trace_len;
u8 option_data[256];
} ip6_hop_by_hop_trace_t;
vlib_node_registration_t ip6_hop_by_hop_node;
static char *ip6_hop_by_hop_error_strings[] = {
#define _(sym,string) string,
foreach_ip6_hop_by_hop_error
#undef _
};
static u8 *
format_ip6_hop_by_hop_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 *);
ip6_hop_by_hop_trace_t *t = va_arg (*args, ip6_hop_by_hop_trace_t *);
ip6_hop_by_hop_header_t *hbh0;
ip6_hop_by_hop_option_t *opt0, *limit0;
ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
u8 type0;
hbh0 = (ip6_hop_by_hop_header_t *) t->option_data;
s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
t->next_index, (hbh0->length + 1) << 3, t->trace_len);
opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
limit0 = (ip6_hop_by_hop_option_t *) ((u8 *) hbh0) + t->trace_len;
while (opt0 < limit0)
{
type0 = opt0->type;
switch (type0)
{
case 0: /* Pad, just stop */
opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
break;
default:
if (hm->trace[type0])
{
s = (*hm->trace[type0]) (s, opt0);
}
else
{
s =
format (s, "\n unrecognized option %d length %d", type0,
opt0->length);
}
opt0 =
(ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
sizeof (ip6_hop_by_hop_option_t));
break;
}
}
return s;
}
always_inline u8
ip6_scan_hbh_options (vlib_buffer_t * b0,
ip6_header_t * ip0,
ip6_hop_by_hop_header_t * hbh0,
ip6_hop_by_hop_option_t * opt0,
ip6_hop_by_hop_option_t * limit0, u32 * next0)
{
ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
u8 type0;
u8 error0 = 0;
while (opt0 < limit0)
{
type0 = opt0->type;
switch (type0)
{
case 0: /* Pad1 */
opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
continue;
case 1: /* PadN */
break;
default:
if (hm->options[type0])
{
if ((*hm->options[type0]) (b0, ip0, opt0) < 0)
{
error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
return (error0);
}
}
else
{
/* Unrecognized mandatory option, check the two high order bits */
switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
{
case HBH_OPTION_TYPE_SKIP_UNKNOWN:
break;
case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
*next0 = IP_LOOKUP_NEXT_DROP;
break;
case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
*next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
ICMP6_parameter_problem_unrecognized_option,
(u8 *) opt0 - (u8 *) ip0);
break;
case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
if (!ip6_address_is_multicast (&ip0->dst_address))
{
*next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
icmp6_error_set_vnet_buffer (b0,
ICMP6_parameter_problem,
ICMP6_parameter_problem_unrecognized_option,
(u8 *) opt0 - (u8 *) ip0);
}
else
{
*next0 = IP_LOOKUP_NEXT_DROP;
}
break;
}
return (error0);
}
}
opt0 =
(ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
sizeof (ip6_hop_by_hop_option_t));
}
return (error0);
}
/*
* Process the Hop-by-Hop Options header
*/
static uword
ip6_hop_by_hop (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
vlib_node_runtime_t *error_node =
vlib_node_get_runtime (vm, ip6_hop_by_hop_node.index);
ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
u32 n_left_from, *from, *to_next;
ip_lookup_next_t next_index;
ip6_main_t *im = &ip6_main;
ip_lookup_main_t *lm = &im->lookup_main;
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);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
u32 bi0, bi1;
vlib_buffer_t *b0, *b1;
u32 next0, next1;
ip6_header_t *ip0, *ip1;
ip6_hop_by_hop_header_t *hbh0, *hbh1;
ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
u8 error0 = 0, error1 = 0;
/* 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);
}
/* Speculatively enqueue b0, b1 to the current next frame */
to_next[0] = bi0 = from[0];
to_next[1] = bi1 = from[1];
from += 2;
to_next += 2;
n_left_from -= 2;
n_left_to_next -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
/* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
ip_adjacency_t *adj0 = ip_get_adjacency (lm, adj_index0);
u32 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
ip_adjacency_t *adj1 = ip_get_adjacency (lm, adj_index1);
/* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
next0 = adj0->lookup_next_index;
next1 = adj1->lookup_next_index;
ip0 = vlib_buffer_get_current (b0);
ip1 = vlib_buffer_get_current (b1);
hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
opt1 = (ip6_hop_by_hop_option_t *) (hbh1 + 1);
limit0 =
(ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
((hbh0->length + 1) << 3));
limit1 =
(ip6_hop_by_hop_option_t *) ((u8 *) hbh1 +
((hbh1->length + 1) << 3));
/*
* Basic validity checks
*/
if ((hbh0->length + 1) << 3 >
clib_net_to_host_u16 (ip0->payload_length))
{
error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
next0 = IP_LOOKUP_NEXT_DROP;
goto outdual;
}
/* Scan the set of h-b-h options, process ones that we understand */
error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
if ((hbh1->length + 1) << 3 >
clib_net_to_host_u16 (ip1->payload_length))
{
error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
next1 = IP_LOOKUP_NEXT_DROP;
goto outdual;
}
/* Scan the set of h-b-h options, process ones that we understand */
error1 = ip6_scan_hbh_options (b1, ip1, hbh1, opt1, limit1, &next1);
outdual:
/* Has the classifier flagged this buffer for special treatment? */
if (PREDICT_FALSE
((error0 == 0)
&& (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
next0 = hm->next_override;
/* Has the classifier flagged this buffer for special treatment? */
if (PREDICT_FALSE
((error1 == 0)
&& (vnet_buffer (b1)->l2_classify.opaque_index & OI_DECAP)))
next1 = hm->next_override;
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
{
if (b0->flags & VLIB_BUFFER_IS_TRACED)
{
ip6_hop_by_hop_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
u32 trace_len = (hbh0->length + 1) << 3;
t->next_index = next0;
/* Capture the h-b-h option verbatim */
trace_len =
trace_len <
ARRAY_LEN (t->option_data) ? trace_len :
ARRAY_LEN (t->option_data);
t->trace_len = trace_len;
clib_memcpy (t->option_data, hbh0, trace_len);
}
if (b1->flags & VLIB_BUFFER_IS_TRACED)
{
ip6_hop_by_hop_trace_t *t =
vlib_add_trace (vm, node, b1, sizeof (*t));
u32 trace_len = (hbh1->length + 1) << 3;
t->next_index = next1;
/* Capture the h-b-h option verbatim */
trace_len =
trace_len <
ARRAY_LEN (t->option_data) ? trace_len :
ARRAY_LEN (t->option_data);
t->trace_len = trace_len;
clib_memcpy (t->option_data, hbh1, trace_len);
}
}
b0->error = error_node->errors[error0];
b1->error = error_node->errors[error1];
/* verify speculative enqueue, maybe switch current next frame */
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;
ip6_header_t *ip0;
ip6_hop_by_hop_header_t *hbh0;
ip6_hop_by_hop_option_t *opt0, *limit0;
u8 error0 = 0;
/* Speculatively enqueue b0 to the current next frame */
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);
/*
* Default use the next_index from the adjacency.
* A HBH option rarely redirects to a different node
*/
u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
ip_adjacency_t *adj0 = ip_get_adjacency (lm, adj_index0);
next0 = adj0->lookup_next_index;
ip0 = vlib_buffer_get_current (b0);
hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
limit0 =
(ip6_hop_by_hop_option_t *) ((u8 *) hbh0 +
((hbh0->length + 1) << 3));
/*
* Basic validity checks
*/
if ((hbh0->length + 1) << 3 >
clib_net_to_host_u16 (ip0->payload_length))
{
error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
next0 = IP_LOOKUP_NEXT_DROP;
goto out0;
}
/* Scan the set of h-b-h options, process ones that we understand */
error0 = ip6_scan_hbh_options (b0, ip0, hbh0, opt0, limit0, &next0);
out0:
/* Has the classifier flagged this buffer for special treatment? */
if (PREDICT_FALSE
((error0 == 0)
&& (vnet_buffer (b0)->l2_classify.opaque_index & OI_DECAP)))
next0 = hm->next_override;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_hop_by_hop_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
u32 trace_len = (hbh0->length + 1) << 3;
t->next_index = next0;
/* Capture the h-b-h option verbatim */
trace_len =
trace_len <
ARRAY_LEN (t->option_data) ? trace_len :
ARRAY_LEN (t->option_data);
t->trace_len = trace_len;
clib_memcpy (t->option_data, hbh0, trace_len);
}
b0->error = error_node->errors[error0];
/* verify speculative enqueue, maybe switch current next frame */
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 frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_hop_by_hop_node) =
{
.function = ip6_hop_by_hop,
.name = "ip6-hop-by-hop",
.sibling_of = "ip6-lookup",
.vector_size = sizeof (u32),
.format_trace = format_ip6_hop_by_hop_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (ip6_hop_by_hop_error_strings),
.error_strings = ip6_hop_by_hop_error_strings,
.n_next_nodes = 0,
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop);
static clib_error_t *
ip6_hop_by_hop_init (vlib_main_t * vm)
{
ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
memset (hm->options, 0, sizeof (hm->options));
memset (hm->trace, 0, sizeof (hm->trace));
hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
return (0);
}
VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
void
ip6_hbh_set_next_override (uword next)
{
ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
hm->next_override = next;
}
int
ip6_hbh_register_option (u8 option,
int options (vlib_buffer_t * b, ip6_header_t * ip,
ip6_hop_by_hop_option_t * opt),
u8 * trace (u8 * s, ip6_hop_by_hop_option_t * opt))
{
ip6_main_t *im = &ip6_main;
ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
ASSERT (option < ARRAY_LEN (hm->options));
/* Already registered */
if (hm->options[option])
return (-1);
hm->options[option] = options;
hm->trace[option] = trace;
/* Set global variable */
im->hbh_enabled = 1;
return (0);
}
int
ip6_hbh_unregister_option (u8 option)
{
ip6_main_t *im = &ip6_main;
ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
ASSERT (option < ARRAY_LEN (hm->options));
/* Not registered */
if (!hm->options[option])
return (-1);
hm->options[option] = NULL;
hm->trace[option] = NULL;
/* Disable global knob if this was the last option configured */
int i;
bool found = false;
for (i = 0; i < 256; i++)
{
if (hm->options[option])
{
found = true;
break;
}
}
if (!found)
im->hbh_enabled = 0;
return (0);
}
/* Global IP6 main. */
ip6_main_t ip6_main;
static clib_error_t *
ip6_lookup_init (vlib_main_t * vm)
{
ip6_main_t *im = &ip6_main;
clib_error_t *error;
uword i;
if ((error = vlib_call_init_function (vm, vnet_feature_init)))
return error;
for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
{
u32 j, i0, i1;
i0 = i / 32;
i1 = i % 32;
for (j = 0; j < i0; j++)
im->fib_masks[i].as_u32[j] = ~0;
if (i1)
im->fib_masks[i].as_u32[i0] =
clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
}
ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
if (im->lookup_table_nbuckets == 0)
im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
im->lookup_table_nbuckets = 1 << max_log2 (im->lookup_table_nbuckets);
if (im->lookup_table_size == 0)
im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
BV (clib_bihash_init) (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
"ip6 FIB fwding table",
im->lookup_table_nbuckets, im->lookup_table_size);
BV (clib_bihash_init) (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
"ip6 FIB non-fwding table",
im->lookup_table_nbuckets, im->lookup_table_size);
/* Create FIB with index 0 and table id of 0. */
fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, 0);
{
pg_node_t *pn;
pn = pg_get_node (ip6_lookup_node.index);
pn->unformat_edit = unformat_pg_ip6_header;
}
/* Unless explicitly configured, don't process HBH options */
im->hbh_enabled = 0;
{
icmp6_neighbor_solicitation_header_t p;
memset (&p, 0, sizeof (p));
p.ip.ip_version_traffic_class_and_flow_label =
clib_host_to_net_u32 (0x6 << 28);
p.ip.payload_length =
clib_host_to_net_u16 (sizeof (p) -
STRUCT_OFFSET_OF
(icmp6_neighbor_solicitation_header_t, neighbor));
p.ip.protocol = IP_PROTOCOL_ICMP6;
p.ip.hop_limit = 255;
ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
p.link_layer_option.header.type =
ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
p.link_layer_option.header.n_data_u64s =
sizeof (p.link_layer_option) / sizeof (u64);
vlib_packet_template_init (vm,
&im->discover_neighbor_packet_template,
&p, sizeof (p),
/* alloc chunk size */ 8,
"ip6 neighbor discovery");
}
return error;
}
VLIB_INIT_FUNCTION (ip6_lookup_init);
static clib_error_t *
add_del_ip6_interface_table (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
vnet_main_t *vnm = vnet_get_main ();
clib_error_t *error = 0;
u32 sw_if_index, table_id;
sw_if_index = ~0;
if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
{
error = clib_error_return (0, "unknown interface `%U'",
format_unformat_error, input);
goto done;
}
if (unformat (input, "%d", &table_id))
;
else
{
error = clib_error_return (0, "expected table id `%U'",
format_unformat_error, input);
goto done;
}
{
u32 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6,
table_id);
vec_validate (ip6_main.fib_index_by_sw_if_index, sw_if_index);
ip6_main.fib_index_by_sw_if_index[sw_if_index] = fib_index;
}
done:
return error;
}
/*?
* Place the indicated interface into the supplied IPv6 FIB table (also known
* as a VRF). If the FIB table does not exist, this command creates it. To
* display the current IPv6 FIB table, use the command '<em>show ip6 fib</em>'.
* FIB table will only be displayed if a route has been added to the table, or
* an IP Address is assigned to an interface in the table (which adds a route
* automatically).
*
* @note IP addresses added after setting the interface IP table end up in
* the indicated FIB table. If the IP address is added prior to adding the
* interface to the FIB table, it will NOT be part of the FIB table. Predictable
* but potentially counter-intuitive results occur if you provision interface
* addresses in multiple FIBs. Upon RX, packets will be processed in the last
* IP table ID provisioned. It might be marginally useful to evade source RPF
* drops to put an interface address into multiple FIBs.
*
* @cliexpar
* Example of how to add an interface to an IPv6 FIB table (where 2 is the table-id):
* @cliexcmd{set interface ip6 table GigabitEthernet2/0/0 2}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_interface_ip6_table_command, static) =
{
.path = "set interface ip6 table",
.function = add_del_ip6_interface_table,
.short_help = "set interface ip6 table <interface> <table-id>"
};
/* *INDENT-ON* */
void
ip6_link_local_address_from_ethernet_mac_address (ip6_address_t * ip,
u8 * mac)
{
ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
/* Invert the "u" bit */
ip->as_u8[8] = mac[0] ^ (1 << 1);
ip->as_u8[9] = mac[1];
ip->as_u8[10] = mac[2];
ip->as_u8[11] = 0xFF;
ip->as_u8[12] = 0xFE;
ip->as_u8[13] = mac[3];
ip->as_u8[14] = mac[4];
ip->as_u8[15] = mac[5];
}
void
ip6_ethernet_mac_address_from_link_local_address (u8 * mac,
ip6_address_t * ip)
{
/* Invert the previously inverted "u" bit */
mac[0] = ip->as_u8[8] ^ (1 << 1);
mac[1] = ip->as_u8[9];
mac[2] = ip->as_u8[10];
mac[3] = ip->as_u8[13];
mac[4] = ip->as_u8[14];
mac[5] = ip->as_u8[15];
}
static clib_error_t *
test_ip6_link_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
u8 mac[6];
ip6_address_t _a, *a = &_a;
if (unformat (input, "%U", unformat_ethernet_address, mac))
{
ip6_link_local_address_from_ethernet_mac_address (a, mac);
vlib_cli_output (vm, "Link local address: %U", format_ip6_address, a);
ip6_ethernet_mac_address_from_link_local_address (mac, a);
vlib_cli_output (vm, "Original MAC address: %U",
format_ethernet_address, mac);
}
return 0;
}
/*?
* This command converts the given MAC Address into an IPv6 link-local
* address.
*
* @cliexpar
* Example of how to create an IPv6 link-local address:
* @cliexstart{test ip6 link 16:d9:e0:91:79:86}
* Link local address: fe80::14d9:e0ff:fe91:7986
* Original MAC address: 16:d9:e0:91:79:86
* @cliexend
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (test_link_command, static) =
{
.path = "test ip6 link",
.function = test_ip6_link_command_fn,
.short_help = "test ip6 link <mac-address>",
};
/* *INDENT-ON* */
int
vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
{
ip6_main_t *im6 = &ip6_main;
ip6_fib_t *fib;
uword *p = hash_get (im6->fib_index_by_table_id, table_id);
if (p == 0)
return -1;
fib = ip6_fib_get (p[0]);
fib->flow_hash_config = flow_hash_config;
return 1;
}
static clib_error_t *
set_ip6_flow_hash_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
int matched = 0;
u32 table_id = 0;
u32 flow_hash_config = 0;
int rv;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "table %d", &table_id))
matched = 1;
#define _(a,v) \
else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
foreach_flow_hash_bit
#undef _
else
break;
}
if (matched == 0)
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
switch (rv)
{
case 1:
break;
case -1:
return clib_error_return (0, "no such FIB table %d", table_id);
default:
clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
break;
}
return 0;
}
/*?
* Configure the set of IPv6 fields used by the flow hash.
*
* @cliexpar
* @parblock
* Example of how to set the flow hash on a given table:
* @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
*
* Example of display the configured flow hash:
* @cliexstart{show ip6 fib}
* ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
* @::/0
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* fe80::/10
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
* [0] [@2]: dpo-receive
* ff02::1/128
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
* [0] [@2]: dpo-receive
* ff02::2/128
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
* [0] [@2]: dpo-receive
* ff02::16/128
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
* [0] [@2]: dpo-receive
* ff02::1:ff00:0/104
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
* [0] [@2]: dpo-receive
* ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
* @::/0
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* @::a:1:1:0:4/126
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
* [0] [@4]: ipv6-glean: af_packet0
* @::a:1:1:0:7/128
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
* [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
* fe80::/10
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
* [0] [@2]: dpo-receive
* fe80::fe:3eff:fe3e:9222/128
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
* [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
* ff02::1/128
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
* [0] [@2]: dpo-receive
* ff02::2/128
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
* [0] [@2]: dpo-receive
* ff02::16/128
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
* [0] [@2]: dpo-receive
* ff02::1:ff00:0/104
* unicast-ip6-chain
* [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
* [0] [@2]: dpo-receive
* @cliexend
* @endparblock
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) =
{
.path = "set ip6 flow-hash",
.short_help =
"set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
.function = set_ip6_flow_hash_command_fn,
};
/* *INDENT-ON* */
static clib_error_t *
show_ip6_local_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
ip6_main_t *im = &ip6_main;
ip_lookup_main_t *lm = &im->lookup_main;
int i;
vlib_cli_output (vm, "Protocols handled by ip6_local");
for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
{
if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
vlib_cli_output (vm, "%d", i);
}
return 0;
}
/*?
* Display the set of protocols handled by the local IPv6 stack.
*
* @cliexpar
* Example of how to display local protocol table:
* @cliexstart{show ip6 local}
* Protocols handled by ip6_local
* 17
* 43
* 58
* 115
* @cliexend
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_ip6_local, static) =
{
.path = "show ip6 local",
.function = show_ip6_local_command_fn,
.short_help = "show ip6 local",
};
/* *INDENT-ON* */
int
vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
u32 table_index)
{
vnet_main_t *vnm = vnet_get_main ();
vnet_interface_main_t *im = &vnm->interface_main;
ip6_main_t *ipm = &ip6_main;
ip_lookup_main_t *lm = &ipm->lookup_main;
vnet_classify_main_t *cm = &vnet_classify_main;
ip6_address_t *if_addr;
if (pool_is_free_index (im->sw_interfaces, sw_if_index))
return VNET_API_ERROR_NO_MATCHING_INTERFACE;
if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
return VNET_API_ERROR_NO_SUCH_ENTRY;
vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
if_addr = ip6_interface_first_address (ipm, sw_if_index, NULL);
if (NULL != if_addr)
{
fib_prefix_t pfx = {
.fp_len = 128,
.fp_proto = FIB_PROTOCOL_IP6,
.fp_addr.ip6 = *if_addr,
};
u32 fib_index;
fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
sw_if_index);
if (table_index != (u32) ~ 0)
{
dpo_id_t dpo = DPO_INVALID;
dpo_set (&dpo,
DPO_CLASSIFY,
DPO_PROTO_IP6,
classify_dpo_create (DPO_PROTO_IP6, table_index));
fib_table_entry_special_dpo_add (fib_index,
&pfx,
FIB_SOURCE_CLASSIFY,
FIB_ENTRY_FLAG_NONE, &dpo);
dpo_reset (&dpo);
}
else
{
fib_table_entry_special_remove (fib_index,
&pfx, FIB_SOURCE_CLASSIFY);
}
}
return 0;
}
static clib_error_t *
set_ip6_classify_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
u32 table_index = ~0;
int table_index_set = 0;
u32 sw_if_index = ~0;
int rv;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "table-index %d", &table_index))
table_index_set = 1;
else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
vnet_get_main (), &sw_if_index))
;
else
break;
}
if (table_index_set == 0)
return clib_error_return (0, "classify table-index must be specified");
if (sw_if_index == ~0)
return clib_error_return (0, "interface / subif must be specified");
rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
switch (rv)
{
case 0:
break;
case VNET_API_ERROR_NO_MATCHING_INTERFACE:
return clib_error_return (0, "No such interface");
case VNET_API_ERROR_NO_SUCH_ENTRY:
return clib_error_return (0, "No such classifier table");
}
return 0;
}
/*?
* Assign a classification table to an interface. The classification
* table is created using the '<em>classify table</em>' and '<em>classify session</em>'
* commands. Once the table is create, use this command to filter packets
* on an interface.
*
* @cliexpar
* Example of how to assign a classification table to an interface:
* @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_ip6_classify_command, static) =
{
.path = "set ip6 classify",
.short_help =
"set ip6 classify intfc <interface> table-index <classify-idx>",
.function = set_ip6_classify_command_fn,
};
/* *INDENT-ON* */
static clib_error_t *
ip6_config (vlib_main_t * vm, unformat_input_t * input)
{
ip6_main_t *im = &ip6_main;
uword heapsize = 0;
u32 tmp;
u32 nbuckets = 0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "hash-buckets %d", &tmp))
nbuckets = tmp;
else if (unformat (input, "heap-size %dm", &tmp))
heapsize = ((u64) tmp) << 20;
else if (unformat (input, "heap-size %dM", &tmp))
heapsize = ((u64) tmp) << 20;
else if (unformat (input, "heap-size %dg", &tmp))
heapsize = ((u64) tmp) << 30;
else if (unformat (input, "heap-size %dG", &tmp))
heapsize = ((u64) tmp) << 30;
else
return clib_error_return (0, "unknown input '%U'",
format_unformat_error, input);
}
im->lookup_table_nbuckets = nbuckets;
im->lookup_table_size = heapsize;
return 0;
}
VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/