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gerrit.nordix.org / fdio / vpp / 072401e8096c648b91f958bd911f64ce24fecff9 / . / src / vnet / ip / ip4_forward.c
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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* ip/ip4_forward.c: IP v4 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/ethernet/arp_packet.h> /* for ethernet_arp_header_t */
#include <vnet/ppp/ppp.h>
#include <vnet/srp/srp.h> /* for srp_hw_interface_class */
#include <vnet/api_errno.h> /* for API error numbers */
#include <vnet/fib/fib_table.h> /* for FIB table and entry creation */
#include <vnet/fib/fib_entry.h> /* for FIB table and entry creation */
#include <vnet/fib/fib_urpf_list.h> /* for FIB uRPF check */
#include <vnet/fib/ip4_fib.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/dpo/load_balance_map.h>
#include <vnet/dpo/classify_dpo.h>
#include <vnet/mfib/mfib_table.h> /* for mFIB table and entry creation */
/**
* @file
* @brief IPv4 Forwarding.
*
* This file contains the source code for IPv4 forwarding.
*/
void
ip4_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
ip4_lookup_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
int lookup_for_responses_to_locally_received_packets)
{
ip4_main_t *im = &ip4_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 thread_index = vlib_get_thread_index ();
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 >= 8 && n_left_to_next >= 4)
{
vlib_buffer_t *p0, *p1, *p2, *p3;
ip4_header_t *ip0, *ip1, *ip2, *ip3;
ip_lookup_next_t next0, next1, next2, next3;
const load_balance_t *lb0, *lb1, *lb2, *lb3;
ip4_fib_mtrie_t *mtrie0, *mtrie1, *mtrie2, *mtrie3;
ip4_fib_mtrie_leaf_t leaf0, leaf1, leaf2, leaf3;
ip4_address_t *dst_addr0, *dst_addr1, *dst_addr2, *dst_addr3;
u32 pi0, fib_index0, lb_index0;
u32 pi1, fib_index1, lb_index1;
u32 pi2, fib_index2, lb_index2;
u32 pi3, fib_index3, lb_index3;
flow_hash_config_t flow_hash_config0, flow_hash_config1;
flow_hash_config_t flow_hash_config2, flow_hash_config3;
u32 hash_c0, hash_c1, hash_c2, hash_c3;
const dpo_id_t *dpo0, *dpo1, *dpo2, *dpo3;
/* Prefetch next iteration. */
{
vlib_buffer_t *p4, *p5, *p6, *p7;
p4 = vlib_get_buffer (vm, from[4]);
p5 = vlib_get_buffer (vm, from[5]);
p6 = vlib_get_buffer (vm, from[6]);
p7 = vlib_get_buffer (vm, from[7]);
vlib_prefetch_buffer_header (p4, LOAD);
vlib_prefetch_buffer_header (p5, LOAD);
vlib_prefetch_buffer_header (p6, LOAD);
vlib_prefetch_buffer_header (p7, LOAD);
CLIB_PREFETCH (p4->data, sizeof (ip0[0]), LOAD);
CLIB_PREFETCH (p5->data, sizeof (ip0[0]), LOAD);
CLIB_PREFETCH (p6->data, sizeof (ip0[0]), LOAD);
CLIB_PREFETCH (p7->data, sizeof (ip0[0]), LOAD);
}
pi0 = to_next[0] = from[0];
pi1 = to_next[1] = from[1];
pi2 = to_next[2] = from[2];
pi3 = to_next[3] = from[3];
from += 4;
to_next += 4;
n_left_to_next -= 4;
n_left_from -= 4;
p0 = vlib_get_buffer (vm, pi0);
p1 = vlib_get_buffer (vm, pi1);
p2 = vlib_get_buffer (vm, pi2);
p3 = vlib_get_buffer (vm, pi3);
ip0 = vlib_buffer_get_current (p0);
ip1 = vlib_buffer_get_current (p1);
ip2 = vlib_buffer_get_current (p2);
ip3 = vlib_buffer_get_current (p3);
dst_addr0 = &ip0->dst_address;
dst_addr1 = &ip1->dst_address;
dst_addr2 = &ip2->dst_address;
dst_addr3 = &ip3->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_index2 =
vec_elt (im->fib_index_by_sw_if_index,
vnet_buffer (p2)->sw_if_index[VLIB_RX]);
fib_index3 =
vec_elt (im->fib_index_by_sw_if_index,
vnet_buffer (p3)->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];
fib_index2 =
(vnet_buffer (p2)->sw_if_index[VLIB_TX] ==
(u32) ~ 0) ? fib_index2 : vnet_buffer (p2)->sw_if_index[VLIB_TX];
fib_index3 =
(vnet_buffer (p3)->sw_if_index[VLIB_TX] ==
(u32) ~ 0) ? fib_index3 : vnet_buffer (p3)->sw_if_index[VLIB_TX];
if (!lookup_for_responses_to_locally_received_packets)
{
mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
mtrie2 = &ip4_fib_get (fib_index2)->mtrie;
mtrie3 = &ip4_fib_get (fib_index3)->mtrie;
leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, dst_addr1);
leaf2 = ip4_fib_mtrie_lookup_step_one (mtrie2, dst_addr2);
leaf3 = ip4_fib_mtrie_lookup_step_one (mtrie3, dst_addr3);
}
if (!lookup_for_responses_to_locally_received_packets)
{
leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 2);
leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 2);
}
if (!lookup_for_responses_to_locally_received_packets)
{
leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 3);
leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 3);
}
if (lookup_for_responses_to_locally_received_packets)
{
lb_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
lb_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
lb_index2 = vnet_buffer (p2)->ip.adj_index[VLIB_RX];
lb_index3 = vnet_buffer (p3)->ip.adj_index[VLIB_RX];
}
else
{
lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
lb_index2 = ip4_fib_mtrie_leaf_get_adj_index (leaf2);
lb_index3 = ip4_fib_mtrie_leaf_get_adj_index (leaf3);
}
ASSERT (lb_index0 && lb_index1 && lb_index2 && lb_index3);
lb0 = load_balance_get (lb_index0);
lb1 = load_balance_get (lb_index1);
lb2 = load_balance_get (lb_index2);
lb3 = load_balance_get (lb_index3);
ASSERT (lb0->lb_n_buckets > 0);
ASSERT (is_pow2 (lb0->lb_n_buckets));
ASSERT (lb1->lb_n_buckets > 0);
ASSERT (is_pow2 (lb1->lb_n_buckets));
ASSERT (lb2->lb_n_buckets > 0);
ASSERT (is_pow2 (lb2->lb_n_buckets));
ASSERT (lb3->lb_n_buckets > 0);
ASSERT (is_pow2 (lb3->lb_n_buckets));
/* Use flow hash to compute multipath adjacency. */
hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
hash_c2 = vnet_buffer (p2)->ip.flow_hash = 0;
hash_c3 = vnet_buffer (p3)->ip.flow_hash = 0;
if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
{
flow_hash_config0 = lb0->lb_hash_config;
hash_c0 = vnet_buffer (p0)->ip.flow_hash =
ip4_compute_flow_hash (ip0, flow_hash_config0);
dpo0 =
load_balance_get_fwd_bucket (lb0,
(hash_c0 &
(lb0->lb_n_buckets_minus_1)));
}
else
{
dpo0 = load_balance_get_bucket_i (lb0, 0);
}
if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
{
flow_hash_config1 = lb1->lb_hash_config;
hash_c1 = vnet_buffer (p1)->ip.flow_hash =
ip4_compute_flow_hash (ip1, flow_hash_config1);
dpo1 =
load_balance_get_fwd_bucket (lb1,
(hash_c1 &
(lb1->lb_n_buckets_minus_1)));
}
else
{
dpo1 = load_balance_get_bucket_i (lb1, 0);
}
if (PREDICT_FALSE (lb2->lb_n_buckets > 1))
{
flow_hash_config2 = lb2->lb_hash_config;
hash_c2 = vnet_buffer (p2)->ip.flow_hash =
ip4_compute_flow_hash (ip2, flow_hash_config2);
dpo2 =
load_balance_get_fwd_bucket (lb2,
(hash_c2 &
(lb2->lb_n_buckets_minus_1)));
}
else
{
dpo2 = load_balance_get_bucket_i (lb2, 0);
}
if (PREDICT_FALSE (lb3->lb_n_buckets > 1))
{
flow_hash_config3 = lb3->lb_hash_config;
hash_c3 = vnet_buffer (p3)->ip.flow_hash =
ip4_compute_flow_hash (ip3, flow_hash_config3);
dpo3 =
load_balance_get_fwd_bucket (lb3,
(hash_c3 &
(lb3->lb_n_buckets_minus_1)));
}
else
{
dpo3 = load_balance_get_bucket_i (lb3, 0);
}
next0 = dpo0->dpoi_next_node;
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
next1 = dpo1->dpoi_next_node;
vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
next2 = dpo2->dpoi_next_node;
vnet_buffer (p2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
next3 = dpo3->dpoi_next_node;
vnet_buffer (p3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
vlib_increment_combined_counter
(cm, thread_index, lb_index0, 1,
vlib_buffer_length_in_chain (vm, p0));
vlib_increment_combined_counter
(cm, thread_index, lb_index1, 1,
vlib_buffer_length_in_chain (vm, p1));
vlib_increment_combined_counter
(cm, thread_index, lb_index2, 1,
vlib_buffer_length_in_chain (vm, p2));
vlib_increment_combined_counter
(cm, thread_index, lb_index3, 1,
vlib_buffer_length_in_chain (vm, p3));
vlib_validate_buffer_enqueue_x4 (vm, node, next,
to_next, n_left_to_next,
pi0, pi1, pi2, pi3,
next0, next1, next2, next3);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *p0;
ip4_header_t *ip0;
ip_lookup_next_t next0;
const load_balance_t *lb0;
ip4_fib_mtrie_t *mtrie0;
ip4_fib_mtrie_leaf_t leaf0;
ip4_address_t *dst_addr0;
u32 pi0, fib_index0, lbi0;
flow_hash_config_t flow_hash_config0;
const dpo_id_t *dpo0;
u32 hash_c0;
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];
if (!lookup_for_responses_to_locally_received_packets)
{
mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
}
if (!lookup_for_responses_to_locally_received_packets)
leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
if (!lookup_for_responses_to_locally_received_packets)
leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
if (lookup_for_responses_to_locally_received_packets)
lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
else
{
/* Handle default route. */
lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
}
ASSERT (lbi0);
lb0 = load_balance_get (lbi0);
ASSERT (lb0->lb_n_buckets > 0);
ASSERT (is_pow2 (lb0->lb_n_buckets));
/* Use flow hash to compute multipath adjacency. */
hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
{
flow_hash_config0 = lb0->lb_hash_config;
hash_c0 = vnet_buffer (p0)->ip.flow_hash =
ip4_compute_flow_hash (ip0, flow_hash_config0);
dpo0 =
load_balance_get_fwd_bucket (lb0,
(hash_c0 &
(lb0->lb_n_buckets_minus_1)));
}
else
{
dpo0 = load_balance_get_bucket_i (lb0, 0);
}
next0 = dpo0->dpoi_next_node;
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
vlib_increment_combined_counter (cm, thread_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)
ip4_forward_next_trace (vm, node, frame, VLIB_TX);
return frame->n_vectors;
}
/** @brief IPv4 lookup node.
@node ip4-lookup
This is the main IPv4 lookup dispatch node.
@param vm vlib_main_t corresponding to the current thread
@param node vlib_node_runtime_t
@param frame vlib_frame_t whose contents should be dispatched
@par Graph mechanics: buffer metadata, next index usage
@em Uses:
- <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
- Indicates the @c sw_if_index value of the interface that the
packet was received on.
- <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
- When the value is @c ~0 then the node performs a longest prefix
match (LPM) for the packet destination address in the FIB attached
to the receive interface.
- Otherwise perform LPM for the packet destination address in the
indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
value (0, 1, ...) and not a VRF id.
@em Sets:
- <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
- The lookup result adjacency index.
<em>Next Index:</em>
- Dispatches the packet to the node index found in
ip_adjacency_t @c adj->lookup_next_index
(where @c adj is the lookup result adjacency).
*/
static uword
ip4_lookup (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip4_lookup_inline (vm, node, frame,
/* lookup_for_responses_to_locally_received_packets */
0);
}
static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
VLIB_REGISTER_NODE (ip4_lookup_node) =
{
.function = ip4_lookup,.name = "ip4-lookup",.vector_size =
sizeof (u32),.format_trace = format_ip4_lookup_trace,.n_next_nodes =
IP_LOOKUP_N_NEXT,.next_nodes = IP4_LOOKUP_NEXT_NODES,};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_node, ip4_lookup);
always_inline uword
ip4_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 thread_index = vlib_get_thread_index ();
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next = node->cached_next_index;
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip4_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 ip4_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 = hc1 = 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 =
ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
}
dpo0 = load_balance_get_fwd_bucket
(lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
}
else
{
dpo0 = load_balance_get_bucket_i (lb0, 0);
}
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 =
ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
}
dpo1 = load_balance_get_fwd_bucket
(lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
}
else
{
dpo1 = load_balance_get_bucket_i (lb1, 0);
}
next0 = dpo0->dpoi_next_node;
next1 = dpo1->dpoi_next_node;
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, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
vlib_increment_combined_counter
(cm, thread_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 ip4_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 = 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 =
ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
}
dpo0 = load_balance_get_fwd_bucket
(lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
}
else
{
dpo0 = load_balance_get_bucket_i (lb0, 0);
}
next0 = dpo0->dpoi_next_node;
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
vlib_increment_combined_counter
(cm, thread_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;
}
VLIB_REGISTER_NODE (ip4_load_balance_node) =
{
.function = ip4_load_balance,.name = "ip4-load-balance",.vector_size =
sizeof (u32),.sibling_of = "ip4-lookup",.format_trace =
format_ip4_lookup_trace,};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_load_balance_node, ip4_load_balance);
/* get first interface address */
ip4_address_t *
ip4_interface_first_address (ip4_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;
ip4_address_t *result = 0;
/* *INDENT-OFF* */
foreach_ip_interface_address
(lm, ia, sw_if_index,
1 /* honor unnumbered */ ,
({
ip4_address_t * a =
ip_interface_address_get_address (lm, ia);
result = a;
break;
}));
/* *INDENT-OFF* */
if (result_ia)
*result_ia = result ? ia : 0;
return result;
}
static void
ip4_add_interface_routes (u32 sw_if_index,
ip4_main_t * im, u32 fib_index,
ip_interface_address_t * a)
{
ip_lookup_main_t *lm = &im->lookup_main;
ip4_address_t *address = ip_interface_address_get_address (lm, a);
fib_prefix_t pfx = {
.fp_len = a->address_length,
.fp_proto = FIB_PROTOCOL_IP4,
.fp_addr.ip4 = *address,
};
if (pfx.fp_len <= 30)
{
/* a /30 or shorter - add a glean for the network address */
fib_table_entry_update_one_path (fib_index, &pfx,
FIB_SOURCE_INTERFACE,
(FIB_ENTRY_FLAG_CONNECTED |
FIB_ENTRY_FLAG_ATTACHED),
FIB_PROTOCOL_IP4,
/* No next-hop address */
NULL,
sw_if_index,
// invalid FIB index
~0,
1,
// no out-label stack
NULL,
FIB_ROUTE_PATH_FLAG_NONE);
/* Add the two broadcast addresses as drop */
fib_prefix_t net_pfx = {
.fp_len = 32,
.fp_proto = FIB_PROTOCOL_IP4,
.fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
};
if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
fib_table_entry_special_add(fib_index,
&net_pfx,
FIB_SOURCE_INTERFACE,
(FIB_ENTRY_FLAG_DROP |
FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
fib_table_entry_special_add(fib_index,
&net_pfx,
FIB_SOURCE_INTERFACE,
(FIB_ENTRY_FLAG_DROP |
FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
}
else if (pfx.fp_len == 31)
{
u32 mask = clib_host_to_net_u32(1);
fib_prefix_t net_pfx = pfx;
net_pfx.fp_len = 32;
net_pfx.fp_addr.ip4.as_u32 ^= mask;
/* a /31 - add the other end as an attached host */
fib_table_entry_update_one_path (fib_index, &net_pfx,
FIB_SOURCE_INTERFACE,
(FIB_ENTRY_FLAG_ATTACHED),
FIB_PROTOCOL_IP4,
&net_pfx.fp_addr,
sw_if_index,
// invalid FIB index
~0,
1,
NULL,
FIB_ROUTE_PATH_FLAG_NONE);
}
pfx.fp_len = 32;
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_IP4,
classify_dpo_create (DPO_PROTO_IP4, 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_IP4,
&pfx.fp_addr,
sw_if_index,
// invalid FIB index
~0,
1, NULL,
FIB_ROUTE_PATH_FLAG_NONE);
}
static void
ip4_del_interface_routes (ip4_main_t * im,
u32 fib_index,
ip4_address_t * address, u32 address_length)
{
fib_prefix_t pfx = {
.fp_len = address_length,
.fp_proto = FIB_PROTOCOL_IP4,
.fp_addr.ip4 = *address,
};
if (pfx.fp_len <= 30)
{
fib_prefix_t net_pfx = {
.fp_len = 32,
.fp_proto = FIB_PROTOCOL_IP4,
.fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
};
if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
fib_table_entry_special_remove(fib_index,
&net_pfx,
FIB_SOURCE_INTERFACE);
net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
fib_table_entry_special_remove(fib_index,
&net_pfx,
FIB_SOURCE_INTERFACE);
fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
}
else if (pfx.fp_len == 31)
{
u32 mask = clib_host_to_net_u32(1);
fib_prefix_t net_pfx = pfx;
net_pfx.fp_len = 32;
net_pfx.fp_addr.ip4.as_u32 ^= mask;
fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE);
}
pfx.fp_len = 32;
fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
}
void
ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
{
ip4_main_t *im = &ip4_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
{
ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
return;
}
vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
!is_enable, 0, 0);
vnet_feature_enable_disable ("ip4-multicast", "ip4-drop",
sw_if_index, !is_enable, 0, 0);
}
static clib_error_t *
ip4_add_del_interface_address_internal (vlib_main_t * vm,
u32 sw_if_index,
ip4_address_t * address,
u32 address_length, u32 is_del)
{
vnet_main_t *vnm = vnet_get_main ();
ip4_main_t *im = &ip4_main;
ip_lookup_main_t *lm = &im->lookup_main;
clib_error_t *error = 0;
u32 if_address_index, elts_before;
ip4_address_fib_t ip4_af, *addr_fib = 0;
vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
ip4_addr_fib_init (&ip4_af, address,
vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
vec_add1 (addr_fib, ip4_af);
/* FIXME-LATER
* there is no support for adj-fib handling in the presence of overlapping
* subnets on interfaces. Easy fix - disallow overlapping subnets, like
* most routers do.
*/
/* *INDENT-OFF* */
if (!is_del)
{
/* When adding an address check that it does not conflict
with an existing address. */
ip_interface_address_t *ia;
foreach_ip_interface_address
(&im->lookup_main, ia, sw_if_index,
0 /* honor unnumbered */ ,
({
ip4_address_t * x =
ip_interface_address_get_address
(&im->lookup_main, ia);
if (ip4_destination_matches_route
(im, address, x, ia->address_length) ||
ip4_destination_matches_route (im,
x,
address,
address_length))
return
clib_error_create
("failed to add %U which conflicts with %U for interface %U",
format_ip4_address_and_length, address,
address_length,
format_ip4_address_and_length, x,
ia->address_length,
format_vnet_sw_if_index_name, vnm,
sw_if_index);
}));
}
/* *INDENT-ON* */
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;
ip4_sw_interface_enable_disable (sw_if_index, !is_del);
if (is_del)
ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
else
ip4_add_interface_routes (sw_if_index,
im, ip4_af.fib_index,
pool_elt_at_index
(lm->if_address_pool, if_address_index));
/* If pool did not grow/shrink: add duplicate address. */
if (elts_before != pool_elts (lm->if_address_pool))
{
ip4_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 *
ip4_add_del_interface_address (vlib_main_t * vm,
u32 sw_if_index,
ip4_address_t * address,
u32 address_length, u32 is_del)
{
return ip4_add_del_interface_address_internal
(vm, sw_if_index, address, address_length, is_del);
}
/* Built-in ip4 unicast rx feature path definition */
/* *INDENT-OFF* */
VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
{
.arc_name = "ip4-unicast",
.start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
.arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
};
VNET_FEATURE_INIT (ip4_flow_classify, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-flow-classify",
.runs_before = VNET_FEATURES ("ip4-inacl"),
};
VNET_FEATURE_INIT (ip4_inacl, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-inacl",
.runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
};
VNET_FEATURE_INIT (ip4_source_check_1, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-source-check-via-rx",
.runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
};
VNET_FEATURE_INIT (ip4_source_check_2, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-source-check-via-any",
.runs_before = VNET_FEATURES ("ip4-policer-classify"),
};
VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-source-and-port-range-check-rx",
.runs_before = VNET_FEATURES ("ip4-policer-classify"),
};
VNET_FEATURE_INIT (ip4_policer_classify, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-policer-classify",
.runs_before = VNET_FEATURES ("ipsec-input-ip4"),
};
VNET_FEATURE_INIT (ip4_ipsec, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ipsec-input-ip4",
.runs_before = VNET_FEATURES ("vpath-input-ip4"),
};
VNET_FEATURE_INIT (ip4_vpath, static) =
{
.arc_name = "ip4-unicast",
.node_name = "vpath-input-ip4",
.runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
};
VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-vxlan-bypass",
.runs_before = VNET_FEATURES ("ip4-lookup"),
};
VNET_FEATURE_INIT (ip4_drop, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-drop",
.runs_before = VNET_FEATURES ("ip4-lookup"),
};
VNET_FEATURE_INIT (ip4_lookup, static) =
{
.arc_name = "ip4-unicast",
.node_name = "ip4-lookup",
.runs_before = 0, /* not before any other features */
};
/* Built-in ip4 multicast rx feature path definition */
VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
{
.arc_name = "ip4-multicast",
.start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
.arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
};
VNET_FEATURE_INIT (ip4_vpath_mc, static) =
{
.arc_name = "ip4-multicast",
.node_name = "vpath-input-ip4",
.runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
};
VNET_FEATURE_INIT (ip4_mc_drop, static) =
{
.arc_name = "ip4-multicast",
.node_name = "ip4-drop",
.runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
};
VNET_FEATURE_INIT (ip4_lookup_mc, static) =
{
.arc_name = "ip4-multicast",
.node_name = "ip4-mfib-forward-lookup",
.runs_before = 0, /* last feature */
};
/* Source and port-range check ip4 tx feature path definition */
VNET_FEATURE_ARC_INIT (ip4_output, static) =
{
.arc_name = "ip4-output",
.start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain"),
.arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
};
VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
{
.arc_name = "ip4-output",
.node_name = "ip4-source-and-port-range-check-tx",
.runs_before = VNET_FEATURES ("ipsec-output-ip4"),
};
VNET_FEATURE_INIT (ip4_ipsec_output, static) =
{
.arc_name = "ip4-output",
.node_name = "ipsec-output-ip4",
.runs_before = VNET_FEATURES ("interface-output"),
};
/* Built-in ip4 tx feature path definition */
VNET_FEATURE_INIT (ip4_interface_output, static) =
{
.arc_name = "ip4-output",
.node_name = "interface-output",
.runs_before = 0, /* not before any other features */
};
/* *INDENT-ON* */
static clib_error_t *
ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
{
ip4_main_t *im = &ip4_main;
/* Fill in lookup tables with default table (0). */
vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
if (!is_add)
{
ip4_main_t *im4 = &ip4_main;
ip_lookup_main_t *lm4 = &im4->lookup_main;
ip_interface_address_t *ia = 0;
ip4_address_t *address;
vlib_main_t *vm = vlib_get_main ();
/* *INDENT-OFF* */
foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* honor unnumbered */,
({
address = ip_interface_address_get_address (lm4, ia);
ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
}));
/* *INDENT-ON* */
}
vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
is_add, 0, 0);
vnet_feature_enable_disable ("ip4-multicast", "ip4-drop", sw_if_index,
is_add, 0, 0);
return /* no error */ 0;
}
VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
/* Global IP4 main. */
ip4_main_t ip4_main;
clib_error_t *
ip4_lookup_init (vlib_main_t * vm)
{
ip4_main_t *im = &ip4_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 m;
if (i < 32)
m = pow2_mask (i) << (32 - i);
else
m = ~0;
im->fib_masks[i] = clib_host_to_net_u32 (m);
}
ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
/* Create FIB with index 0 and table id of 0. */
fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
{
pg_node_t *pn;
pn = pg_get_node (ip4_lookup_node.index);
pn->unformat_edit = unformat_pg_ip4_header;
}
{
ethernet_arp_header_t h;
memset (&h, 0, sizeof (h));
/* Set target ethernet address to all zeros. */
memset (h.ip4_over_ethernet[1].ethernet, 0,
sizeof (h.ip4_over_ethernet[1].ethernet));
#define _16(f,v) h.f = clib_host_to_net_u16 (v);
#define _8(f,v) h.f = v;
_16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
_16 (l3_type, ETHERNET_TYPE_IP4);
_8 (n_l2_address_bytes, 6);
_8 (n_l3_address_bytes, 4);
_16 (opcode, ETHERNET_ARP_OPCODE_request);
#undef _16
#undef _8
vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
/* data */ &h,
sizeof (h),
/* alloc chunk size */ 8,
"ip4 arp");
}
return error;
}
VLIB_INIT_FUNCTION (ip4_lookup_init);
typedef struct
{
/* Adjacency taken. */
u32 dpo_index;
u32 flow_hash;
u32 fib_index;
/* Packet data, possibly *after* rewrite. */
u8 packet_data[64 - 1 * sizeof (u32)];
}
ip4_forward_next_trace_t;
u8 *
format_ip4_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 *);
ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
uword indent = format_get_indent (s);
s = format (s, "%U%U",
format_white_space, indent,
format_ip4_header, t->packet_data, sizeof (t->packet_data));
return s;
}
static u8 *
format_ip4_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 *);
ip4_forward_next_trace_t *t = va_arg (*args, ip4_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->dpo_index, t->flow_hash);
s = format (s, "\n%U%U",
format_white_space, indent,
format_ip4_header, t->packet_data, sizeof (t->packet_data));
return s;
}
static u8 *
format_ip4_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 *);
ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
uword indent = format_get_indent (s);
s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
t->fib_index, t->dpo_index, format_ip_adjacency,
t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
s = format (s, "\n%U%U",
format_white_space, indent,
format_ip_adjacency_packet_data,
t->dpo_index, t->packet_data, sizeof (t->packet_data));
return s;
}
/* Common trace function for all ip4-forward next nodes. */
void
ip4_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;
ip4_main_t *im = &ip4_main;
n_left = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left >= 4)
{
u32 bi0, bi1;
vlib_buffer_t *b0, *b1;
ip4_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->dpo_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->dpo_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;
ip4_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->dpo_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
ip4_drop_or_punt (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, ip4_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,
ip4_input_node.index, error_code);
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip4_forward_next_trace (vm, node, frame, VLIB_TX);
return n_packets;
}
static uword
ip4_drop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP);
}
static uword
ip4_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_drop_node, static) =
{
.function = ip4_drop,
.name = "ip4-drop",
.vector_size = sizeof (u32),
.format_trace = format_ip4_forward_next_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_drop_node, ip4_drop);
VLIB_REGISTER_NODE (ip4_punt_node, static) =
{
.function = ip4_punt,
.name = "ip4-punt",
.vector_size = sizeof (u32),
.format_trace = format_ip4_forward_next_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-punt",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_punt_node, ip4_punt);
/* *INDENT-ON */
/* Compute TCP/UDP/ICMP4 checksum in software. */
u16
ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
ip4_header_t * ip0)
{
ip_csum_t sum0;
u32 ip_header_length, payload_length_host_byte_order;
u32 n_this_buffer, n_bytes_left;
u16 sum16;
void *data_this_buffer;
/* Initialize checksum with ip header. */
ip_header_length = ip4_header_bytes (ip0);
payload_length_host_byte_order =
clib_net_to_host_u16 (ip0->length) - ip_header_length;
sum0 =
clib_host_to_net_u32 (payload_length_host_byte_order +
(ip0->protocol << 16));
if (BITS (uword) == 32)
{
sum0 =
ip_csum_with_carry (sum0,
clib_mem_unaligned (&ip0->src_address, u32));
sum0 =
ip_csum_with_carry (sum0,
clib_mem_unaligned (&ip0->dst_address, u32));
}
else
sum0 =
ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
n_bytes_left = n_this_buffer = payload_length_host_byte_order;
data_this_buffer = (void *) ip0 + ip_header_length;
if (n_this_buffer + ip_header_length > p0->current_length)
n_this_buffer =
p0->current_length >
ip_header_length ? p0->current_length - ip_header_length : 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;
ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
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
ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
{
ip4_header_t *ip0 = vlib_buffer_get_current (p0);
udp_header_t *udp0;
u16 sum16;
ASSERT (ip0->protocol == IP_PROTOCOL_TCP
|| ip0->protocol == IP_PROTOCOL_UDP);
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 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
| ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
return p0->flags;
}
/* *INDENT-OFF* */
VNET_FEATURE_ARC_INIT (ip4_local) =
{
.arc_name = "ip4-local",
.start_nodes = VNET_FEATURES ("ip4-local"),
};
/* *INDENT-ON* */
static inline uword
ip4_local_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, int head_of_feature_arc)
{
ip4_main_t *im = &ip4_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, ip4_input_node.index);
u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_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)
ip4_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;
ip4_header_t *ip0, *ip1;
udp_header_t *udp0, *udp1;
ip4_fib_mtrie_t *mtrie0, *mtrie1;
ip4_fib_mtrie_leaf_t leaf0, leaf1;
const dpo_id_t *dpo0, *dpo1;
const load_balance_t *lb0, *lb1;
u32 pi0, ip_len0, udp_len0, flags0, next0, fib_index0, lbi0;
u32 pi1, ip_len1, udp_len1, flags1, next1, fib_index1, lbi1;
i32 len_diff0, len_diff1;
u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
u32 sw_if_index0, sw_if_index1;
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;
next0 = next1 = IP_LOCAL_NEXT_DROP;
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)->l3_hdr_offset = p0->current_data;
vnet_buffer (p1)->l3_hdr_offset = p1->current_data;
sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
fib_index0 =
(vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
(u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
fib_index1 =
(vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
(u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);
/* Treat IP frag packets as "experimental" protocol for now
until support of IP frag reassembly is implemented */
proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
if (head_of_feature_arc == 0)
{
error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
goto skip_checks;
}
is_udp0 = proto0 == IP_PROTOCOL_UDP;
is_udp1 = proto1 == IP_PROTOCOL_UDP;
is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
flags0 = p0->flags;
flags1 = p1->flags;
good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
good_tcp_udp1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
udp0 = ip4_next_header (ip0);
udp1 = ip4_next_header (ip1);
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
/* Verify UDP length. */
ip_len0 = clib_net_to_host_u16 (ip0->length);
ip_len1 = clib_net_to_host_u16 (ip1->length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
udp_len1 = clib_net_to_host_u16 (udp1->length);
len_diff0 = ip_len0 - udp_len0;
len_diff1 = ip_len1 - udp_len1;
len_diff0 = is_udp0 ? len_diff0 : 0;
len_diff1 = is_udp1 ? len_diff1 : 0;
if (PREDICT_FALSE (!(is_tcp_udp0 & is_tcp_udp1
& good_tcp_udp0 & good_tcp_udp1)))
{
if (is_tcp_udp0)
{
if (is_tcp_udp0
&& !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
good_tcp_udp0 =
(flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
}
if (is_tcp_udp1)
{
if (is_tcp_udp1
&& !(flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
flags1 = ip4_tcp_udp_validate_checksum (vm, p1);
good_tcp_udp1 =
(flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
}
}
good_tcp_udp0 &= len_diff0 >= 0;
good_tcp_udp1 &= len_diff1 >= 0;
leaf0 =
ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
leaf1 =
ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 2);
error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
error1 = len_diff1 < 0 ? IP4_ERROR_UDP_LENGTH : error1;
ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
error0 = (is_tcp_udp0 && !good_tcp_udp0
? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
error1 = (is_tcp_udp1 && !good_tcp_udp1
? IP4_ERROR_TCP_CHECKSUM + is_udp1 : error1);
leaf0 =
ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
leaf1 =
ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 3);
vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
ip4_fib_mtrie_leaf_get_adj_index (leaf0);
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
ip4_fib_mtrie_leaf_get_adj_index (leaf1);
vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
lb0 = load_balance_get (lbi0);
lb1 = load_balance_get (lbi1);
dpo0 = load_balance_get_bucket_i (lb0, 0);
dpo1 = load_balance_get_bucket_i (lb1, 0);
/*
* Must have a route to source otherwise we drop the packet.
* ip4 broadcasts are accepted, e.g. to make dhcp client work
*
* The checks are:
* - the source is a recieve => it's from us => bogus, do this
* first since it sets a different error code.
* - uRPF check for any route to source - accept if passes.
* - allow packets destined to the broadcast address from unknown sources
*/
error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
dpo0->dpoi_type == DPO_RECEIVE) ?
IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
!fib_urpf_check_size (lb0->lb_urpf) &&
ip0->dst_address.as_u32 != 0xFFFFFFFF)
? IP4_ERROR_SRC_LOOKUP_MISS : error0);
error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
dpo1->dpoi_type == DPO_RECEIVE) ?
IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
!fib_urpf_check_size (lb1->lb_urpf) &&
ip1->dst_address.as_u32 != 0xFFFFFFFF)
? IP4_ERROR_SRC_LOOKUP_MISS : error1);
skip_checks:
next0 = lm->local_next_by_ip_protocol[proto0];
next1 = lm->local_next_by_ip_protocol[proto1];
next0 =
error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
next1 =
error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
p0->error = error0 ? error_node->errors[error0] : 0;
p1->error = error1 ? error_node->errors[error1] : 0;
if (head_of_feature_arc)
{
if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
vnet_feature_arc_start (arc_index, sw_if_index1, &next1, 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)
{
vlib_buffer_t *p0;
ip4_header_t *ip0;
udp_header_t *udp0;
ip4_fib_mtrie_t *mtrie0;
ip4_fib_mtrie_leaf_t leaf0;
u32 pi0, next0, ip_len0, udp_len0, flags0, fib_index0, lbi0;
i32 len_diff0;
u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
load_balance_t *lb0;
const dpo_id_t *dpo0;
u32 sw_if_index0;
pi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
next0 = IP_LOCAL_NEXT_DROP;
p0 = vlib_get_buffer (vm, pi0);
ip0 = vlib_buffer_get_current (p0);
vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
fib_index0 =
(vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
(u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
/* Treat IP frag packets as "experimental" protocol for now
until support of IP frag reassembly is implemented */
proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
if (head_of_feature_arc == 0)
{
error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
goto skip_check;
}
is_udp0 = proto0 == IP_PROTOCOL_UDP;
is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
flags0 = p0->flags;
good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
udp0 = ip4_next_header (ip0);
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
/* Verify UDP length. */
ip_len0 = clib_net_to_host_u16 (ip0->length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
len_diff0 = ip_len0 - udp_len0;
len_diff0 = is_udp0 ? len_diff0 : 0;
if (PREDICT_FALSE (!(is_tcp_udp0 & good_tcp_udp0)))
{
if (is_tcp_udp0)
{
if (is_tcp_udp0
&& !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
good_tcp_udp0 =
(flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
}
}
good_tcp_udp0 &= len_diff0 >= 0;
leaf0 =
ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
error0 = (is_tcp_udp0 && !good_tcp_udp0
? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
leaf0 =
ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
lb0 = load_balance_get (lbi0);
dpo0 = load_balance_get_bucket_i (lb0, 0);
vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
dpo0->dpoi_type == DPO_RECEIVE) ?
IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
!fib_urpf_check_size (lb0->lb_urpf) &&
ip0->dst_address.as_u32 != 0xFFFFFFFF)
? IP4_ERROR_SRC_LOOKUP_MISS : error0);
skip_check:
next0 = lm->local_next_by_ip_protocol[proto0];
next0 =
error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
p0->error = error0 ? error_node->errors[error0] : 0;
if (head_of_feature_arc)
{
if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
}
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;
}
static uword
ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_local_node) =
{
.function = ip4_local,
.name = "ip4-local",
.vector_size = sizeof (u32),
.format_trace = format_ip4_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] = "ip4-udp-lookup",
[IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
static uword
ip4_local_end_of_arc (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
.function = ip4_local_end_of_arc,
.name = "ip4-local-end-of-arc",
.vector_size = sizeof (u32),
.format_trace = format_ip4_forward_next_trace,
.sibling_of = "ip4-local",
};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
.arc_name = "ip4-local",
.node_name = "ip4-local-end-of-arc",
.runs_before = 0, /* not before any other features */
};
/* *INDENT-ON* */
void
ip4_register_protocol (u32 protocol, u32 node_index)
{
vlib_main_t *vm = vlib_get_main ();
ip4_main_t *im = &ip4_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, ip4_local_node.index, node_index);
}
static clib_error_t *
show_ip_local_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
ip4_main_t *im = &ip4_main;
ip_lookup_main_t *lm = &im->lookup_main;
int i;
vlib_cli_output (vm, "Protocols handled by ip4_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 IPv4 stack.
*
* @cliexpar
* Example of how to display local protocol table:
* @cliexstart{show ip local}
* Protocols handled by ip4_local
* 1
* 17
* 47
* @cliexend
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_ip_local, static) =
{
.path = "show ip local",
.function = show_ip_local_command_fn,
.short_help = "show ip local",
};
/* *INDENT-ON* */
always_inline uword
ip4_arp_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, int is_glean)
{
vnet_main_t *vnm = vnet_get_main ();
ip4_main_t *im = &ip4_main;
ip_lookup_main_t *lm = &im->lookup_main;
u32 *from, *to_next_drop;
uword n_left_from, n_left_to_next_drop, next_index;
static f64 time_last_seed_change = -1e100;
static u32 hash_seeds[3];
static uword hash_bitmap[256 / BITS (uword)];
f64 time_now;
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip4_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 no-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;
next_index = node->cached_next_index;
if (next_index == IP4_ARP_NEXT_DROP)
next_index = IP4_ARP_N_NEXT; /* point to first interface */
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
to_next_drop, n_left_to_next_drop);
while (n_left_from > 0 && n_left_to_next_drop > 0)
{
u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
ip_adjacency_t *adj0;
vlib_buffer_t *p0;
ip4_header_t *ip0;
uword bm0;
pi0 = from[0];
p0 = vlib_get_buffer (vm, pi0);
adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
adj0 = adj_get (adj_index0);
ip0 = vlib_buffer_get_current (p0);
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;
if (is_glean)
{
/*
* this is the Glean case, so we are ARPing for the
* packet's destination
*/
a0 ^= ip0->dst_address.data_u32;
}
else
{
a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
}
b0 ^= sw_if_index0;
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;
p0->error =
node->errors[drop0 ? IP4_ARP_ERROR_DROP :
IP4_ARP_ERROR_REQUEST_SENT];
/*
* 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;
if (drop0)
continue;
/*
* Can happen if the control-plane is programming tables
* with traffic flowing; at least that's today's lame excuse.
*/
if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
|| (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
{
p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
}
else
/* Send ARP request. */
{
u32 bi0 = 0;
vlib_buffer_t *b0;
ethernet_arp_header_t *h0;
vnet_hw_interface_t *hw_if0;
h0 =
vlib_packet_template_get_packet (vm,
&im->ip4_arp_request_packet_template,
&bi0);
/* Add rewrite/encap string for ARP packet. */
vnet_rewrite_one_header (adj0[0], h0,
sizeof (ethernet_header_t));
hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
/* Src ethernet address in ARP header. */
clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
hw_if0->hw_address,
sizeof (h0->ip4_over_ethernet[0].ethernet));
if (is_glean)
{
/* The interface's source address is stashed in the Glean Adj */
h0->ip4_over_ethernet[0].ip4 =
adj0->sub_type.glean.receive_addr.ip4;
/* Copy in destination address we are requesting. This is the
* glean case, so it's the packet's destination.*/
h0->ip4_over_ethernet[1].ip4.data_u32 =
ip0->dst_address.data_u32;
}
else
{
/* Src IP address in ARP header. */
if (ip4_src_address_for_packet (lm, sw_if_index0,
&h0->
ip4_over_ethernet[0].ip4))
{
/* No source address available */
p0->error =
node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
vlib_buffer_free (vm, &bi0, 1);
continue;
}
/* Copy in destination address we are requesting from the
incomplete adj */
h0->ip4_over_ethernet[1].ip4.data_u32 =
adj0->sub_type.nbr.next_hop.ip4.as_u32;
}
vlib_buffer_copy_trace_flag (vm, p0, bi0);
b0 = vlib_get_buffer (vm, bi0);
vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
vlib_set_next_frame_buffer (vm, node,
adj0->rewrite_header.next_index,
bi0);
}
}
vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
}
return frame->n_vectors;
}
static uword
ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return (ip4_arp_inline (vm, node, frame, 0));
}
static uword
ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return (ip4_arp_inline (vm, node, frame, 1));
}
static char *ip4_arp_error_strings[] = {
[IP4_ARP_ERROR_DROP] = "address overflow drops",
[IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
[IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
[IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
[IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
[IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
};
VLIB_REGISTER_NODE (ip4_arp_node) =
{
.function = ip4_arp,.name = "ip4-arp",.vector_size =
sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
ARRAY_LEN (ip4_arp_error_strings),.error_strings =
ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
{
[IP4_ARP_NEXT_DROP] = "error-drop",}
,};
VLIB_REGISTER_NODE (ip4_glean_node) =
{
.function = ip4_glean,.name = "ip4-glean",.vector_size =
sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
ARRAY_LEN (ip4_arp_error_strings),.error_strings =
ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
{
[IP4_ARP_NEXT_DROP] = "error-drop",}
,};
#define foreach_notrace_ip4_arp_error \
_(DROP) \
_(REQUEST_SENT) \
_(REPLICATE_DROP) \
_(REPLICATE_FAIL)
clib_error_t *
arp_notrace_init (vlib_main_t * vm)
{
vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
/* don't trace ARP request packets */
#define _(a) \
vnet_pcap_drop_trace_filter_add_del \
(rt->errors[IP4_ARP_ERROR_##a], \
1 /* is_add */);
foreach_notrace_ip4_arp_error;
#undef _
return 0;
}
VLIB_INIT_FUNCTION (arp_notrace_init);
/* Send an ARP request to see if given destination is reachable on given interface. */
clib_error_t *
ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
{
vnet_main_t *vnm = vnet_get_main ();
ip4_main_t *im = &ip4_main;
ethernet_arp_header_t *h;
ip4_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;
adj_index_t ai;
u32 bi = 0;
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_ip4_address, dst,
format_vnet_sw_if_index_name, vnm,
sw_if_index);
}
src =
ip4_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_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
sw_if_index);
}
ip46_address_t nh = {
.ip4 = *dst,
};
ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
VNET_LINK_IP4, &nh, sw_if_index);
adj = adj_get (ai);
h = vlib_packet_template_get_packet (vm,
&im->ip4_arp_request_packet_template,
&bi);
hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
sizeof (h->ip4_over_ethernet[0].ethernet));
h->ip4_over_ethernet[0].ip4 = src[0];
h->ip4_over_ethernet[1].ip4 = dst[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). */
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);
}
adj_unlock (ai);
return /* no error */ 0;
}
typedef enum
{
IP4_REWRITE_NEXT_DROP,
IP4_REWRITE_NEXT_ICMP_ERROR,
} ip4_rewrite_next_t;
always_inline uword
ip4_rewrite_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
int do_counters, int is_midchain, int is_mcast)
{
ip_lookup_main_t *lm = &ip4_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, ip4_input_node.index);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
u32 thread_index = vlib_get_thread_index ();
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;
ip4_header_t *ip0, *ip1;
u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
u32 pi1, rw_len1, next1, error1, checksum1, 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, 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);
adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
/*
* pre-fetch the per-adjacency counters
*/
if (do_counters)
{
vlib_prefetch_combined_counter (&adjacency_counters,
thread_index, adj_index0);
vlib_prefetch_combined_counter (&adjacency_counters,
thread_index, adj_index1);
}
ip0 = vlib_buffer_get_current (p0);
ip1 = vlib_buffer_get_current (p1);
error0 = error1 = IP4_ERROR_NONE;
next0 = next1 = IP4_REWRITE_NEXT_DROP;
/* Decrement TTL & update checksum.
Works either endian, so no need for byte swap. */
if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
{
i32 ttl0 = ip0->ttl;
/* Input node should have reject packets with ttl 0. */
ASSERT (ip0->ttl > 0);
checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
checksum0 += checksum0 >= 0xffff;
ip0->checksum = checksum0;
ttl0 -= 1;
ip0->ttl = ttl0;
/*
* If the ttl drops below 1 when forwarding, generate
* an ICMP response.
*/
if (PREDICT_FALSE (ttl0 <= 0))
{
error0 = IP4_ERROR_TIME_EXPIRED;
vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
ICMP4_time_exceeded_ttl_exceeded_in_transit,
0);
next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
}
/* Verify checksum. */
ASSERT (ip0->checksum == ip4_header_checksum (ip0));
}
else
{
p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
}
if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
{
i32 ttl1 = ip1->ttl;
/* Input node should have reject packets with ttl 0. */
ASSERT (ip1->ttl > 0);
checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
checksum1 += checksum1 >= 0xffff;
ip1->checksum = checksum1;
ttl1 -= 1;
ip1->ttl = ttl1;
/*
* If the ttl drops below 1 when forwarding, generate
* an ICMP response.
*/
if (PREDICT_FALSE (ttl1 <= 0))
{
error1 = IP4_ERROR_TIME_EXPIRED;
vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
ICMP4_time_exceeded_ttl_exceeded_in_transit,
0);
next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
}
/* Verify checksum. */
ASSERT (ip1->checksum == ip4_header_checksum (ip1));
}
else
{
p1->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
}
/* Rewrite packet header and updates lengths. */
adj0 = adj_get (adj_index0);
adj1 = adj_get (adj_index1);
/* Worth pipelining. No guarantee that adj0,1 are hot... */
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;
/* Check MTU of outgoing interface. */
error0 =
(vlib_buffer_length_in_chain (vm, p0) >
adj0[0].
rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
error0);
error1 =
(vlib_buffer_length_in_chain (vm, p1) >
adj1[0].
rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
error1);
/* Don't adjust the buffer for ttl issue; icmp-error node wants
* to see the IP headerr */
if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
{
next0 = adj0[0].rewrite_header.next_index;
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;
if (PREDICT_FALSE
(adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
vnet_feature_arc_start (lm->output_feature_arc_index,
tx_sw_if_index0, &next0, p0);
}
if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
{
next1 = adj1[0].rewrite_header.next_index;
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;
if (PREDICT_FALSE
(adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
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));
/*
* Bump the per-adjacency counters
*/
if (do_counters)
{
vlib_increment_combined_counter
(&adjacency_counters,
thread_index,
adj_index0, 1,
vlib_buffer_length_in_chain (vm, p0) + rw_len0);
vlib_increment_combined_counter
(&adjacency_counters,
thread_index,
adj_index1, 1,
vlib_buffer_length_in_chain (vm, p1) + rw_len1);
}
if (is_midchain)
{
adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
}
if (is_mcast)
{
/*
* copy bytes from the IP address into the MAC rewrite
*/
vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
}
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;
ip4_header_t *ip0;
u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
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];
adj0 = adj_get (adj_index0);
ip0 = vlib_buffer_get_current (p0);
error0 = IP4_ERROR_NONE;
next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
/* Decrement TTL & update checksum. */
if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
{
i32 ttl0 = ip0->ttl;
checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
checksum0 += checksum0 >= 0xffff;
ip0->checksum = checksum0;
ASSERT (ip0->ttl > 0);
ttl0 -= 1;
ip0->ttl = ttl0;
ASSERT (ip0->checksum == ip4_header_checksum (ip0));
if (PREDICT_FALSE (ttl0 <= 0))
{
/*
* If the ttl drops below 1 when forwarding, generate
* an ICMP response.
*/
error0 = IP4_ERROR_TIME_EXPIRED;
next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
ICMP4_time_exceeded_ttl_exceeded_in_transit,
0);
}
}
else
{
p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
}
if (do_counters)
vlib_prefetch_combined_counter (&adjacency_counters,
thread_index, adj_index0);
/* Guess we are only writing on simple Ethernet header. */
vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
if (is_mcast)
{
/*
* copy bytes from the IP address into the MAC rewrite
*/
vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
}
/* Update packet buffer attributes/set output interface. */
rw_len0 = adj0[0].rewrite_header.data_bytes;
vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
if (do_counters)
vlib_increment_combined_counter
(&adjacency_counters,
thread_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
? IP4_ERROR_MTU_EXCEEDED : error0);
p0->error = error_node->errors[error0];
/* Don't adjust the buffer for ttl issue; icmp-error node wants
* to see the IP headerr */
if (PREDICT_TRUE (error0 == IP4_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;
if (is_midchain)
{
adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
}
if (PREDICT_FALSE
(adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
vnet_feature_arc_start (lm->output_feature_arc_index,
tx_sw_if_index0, &next0, p0);
}
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)
ip4_forward_next_trace (vm, node, frame, VLIB_TX);
return frame->n_vectors;
}
/** @brief IPv4 rewrite node.
@node ip4-rewrite
This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
header checksum, fetch the ip adjacency, check the outbound mtu,
apply the adjacency rewrite, and send pkts to the adjacency
rewrite header's rewrite_next_index.
@param vm vlib_main_t corresponding to the current thread
@param node vlib_node_runtime_t
@param frame vlib_frame_t whose contents should be dispatched
@par Graph mechanics: buffer metadata, next index usage
@em Uses:
- <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
- the rewrite adjacency index
- <code>adj->lookup_next_index</code>
- Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
the packet will be dropped.
- <code>adj->rewrite_header</code>
- Rewrite string length, rewrite string, next_index
@em Sets:
- <code>b->current_data, b->current_length</code>
- Updated net of applying the rewrite string
<em>Next Indices:</em>
- <code> adj->rewrite_header.next_index </code>
or @c error-drop
*/
static uword
ip4_rewrite (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
if (adj_are_counters_enabled ())
return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
else
return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
}
static uword
ip4_midchain (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
if (adj_are_counters_enabled ())
return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
else
return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
}
static uword
ip4_rewrite_mcast (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
if (adj_are_counters_enabled ())
return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
else
return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
}
static uword
ip4_mcast_midchain (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
if (adj_are_counters_enabled ())
return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
else
return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_rewrite_node) = {
.function = ip4_rewrite,
.name = "ip4-rewrite",
.vector_size = sizeof (u32),
.format_trace = format_ip4_rewrite_trace,
.n_next_nodes = 2,
.next_nodes = {
[IP4_REWRITE_NEXT_DROP] = "error-drop",
[IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
.function = ip4_rewrite_mcast,
.name = "ip4-rewrite-mcast",
.vector_size = sizeof (u32),
.format_trace = format_ip4_rewrite_trace,
.sibling_of = "ip4-rewrite",
};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
.function = ip4_mcast_midchain,
.name = "ip4-mcast-midchain",
.vector_size = sizeof (u32),
.format_trace = format_ip4_rewrite_trace,
.sibling_of = "ip4-rewrite",
};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
VLIB_REGISTER_NODE (ip4_midchain_node) = {
.function = ip4_midchain,
.name = "ip4-midchain",
.vector_size = sizeof (u32),
.format_trace = format_ip4_forward_next_trace,
.sibling_of = "ip4-rewrite",
};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
/* *INDENT-ON */
static clib_error_t *
add_del_interface_table (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
vnet_main_t *vnm = vnet_get_main ();
ip_interface_address_t *ia;
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;
}
/*
* If the interface already has in IP address, then a change int
* VRF is not allowed. The IP address applied must first be removed.
* We do not do that automatically here, since VPP has no knowledge
* of whether thoses subnets are valid in the destination VRF.
*/
/* *INDENT-OFF* */
foreach_ip_interface_address (&ip4_main.lookup_main,
ia, sw_if_index,
1 /* honor unnumbered */,
({
ip4_address_t * a;
a = ip_interface_address_get_address (&ip4_main.lookup_main, ia);
error = clib_error_return (0, "interface %U has address %U",
format_vnet_sw_if_index_name, vnm,
sw_if_index,
format_ip4_address, a);
goto done;
}));
/* *INDENT-ON* */
{
ip4_main_t *im = &ip4_main;
u32 fib_index;
fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
im->fib_index_by_sw_if_index[sw_if_index] = fib_index;
fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
im->mfib_index_by_sw_if_index[sw_if_index] = fib_index;
}
done:
return error;
}
/*?
* Place the indicated interface into the supplied IPv4 FIB table (also known
* as a VRF). If the FIB table does not exist, this command creates it. To
* display the current IPv4 FIB table, use the command '<em>show ip 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 are added to
* the indicated FIB table. If an IP address is added prior to changing the
* table then this is an error. The control plane must remove these addresses
* first and then change the table. VPP will not automatically move the
* addresses from the old to the new table as it does not know the validity
* of such a change.
*
* @cliexpar
* Example of how to add an interface to an IPv4 FIB table (where 2 is the table-id):
* @cliexcmd{set interface ip table GigabitEthernet2/0/0 2}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_interface_ip_table_command, static) =
{
.path = "set interface ip table",
.function = add_del_interface_table,
.short_help = "set interface ip table <interface> <table-id>",
};
/* *INDENT-ON* */
int
ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
{
ip4_fib_mtrie_t *mtrie0;
ip4_fib_mtrie_leaf_t leaf0;
u32 lbi0;
mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
}
static clib_error_t *
test_lookup_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
ip4_fib_t *fib;
u32 table_id = 0;
f64 count = 1;
u32 n;
int i;
ip4_address_t ip4_base_address;
u64 errors = 0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "table %d", &table_id))
{
/* Make sure the entry exists. */
fib = ip4_fib_get (table_id);
if ((fib) && (fib->index != table_id))
return clib_error_return (0, "<fib-index> %d does not exist",
table_id);
}
else if (unformat (input, "count %f", &count))
;
else if (unformat (input, "%U",
unformat_ip4_address, &ip4_base_address))
;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
n = count;
for (i = 0; i < n; i++)
{
if (!ip4_lookup_validate (&ip4_base_address, table_id))
errors++;
ip4_base_address.as_u32 =
clib_host_to_net_u32 (1 +
clib_net_to_host_u32 (ip4_base_address.as_u32));
}
if (errors)
vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
else
vlib_cli_output (vm, "No errors in %d lookups\n", n);
return 0;
}
/*?
* Perform a lookup of an IPv4 Address (or range of addresses) in the
* given FIB table to determine if there is a conflict with the
* adjacency table. The fib-id can be determined by using the
* '<em>show ip fib</em>' command. If fib-id is not entered, default value
* of 0 is used.
*
* @todo This command uses fib-id, other commands use table-id (not
* just a name, they are different indexes). Would like to change this
* to table-id for consistency.
*
* @cliexpar
* Example of how to run the test lookup command:
* @cliexstart{test lookup 172.16.1.1 table 1 count 2}
* No errors in 2 lookups
* @cliexend
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (lookup_test_command, static) =
{
.path = "test lookup",
.short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
.function = test_lookup_command_fn,
};
/* *INDENT-ON* */
int
vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
{
u32 fib_index;
fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
if (~0 == fib_index)
return VNET_API_ERROR_NO_SUCH_FIB;
fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
flow_hash_config);
return 0;
}
static clib_error_t *
set_ip_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_ip4_flow_hash (table_id, flow_hash_config);
switch (rv)
{
case 0:
break;
case VNET_API_ERROR_NO_SUCH_FIB:
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 IPv4 fields used by the flow hash.
*
* @cliexpar
* Example of how to set the flow hash on a given table:
* @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
* Example of display the configured flow hash:
* @cliexstart{show ip fib}
* ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
* 0.0.0.0/0
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* 0.0.0.0/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* 224.0.0.0/8
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* 6.0.1.2/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
* [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
* 7.0.0.1/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
* [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
* [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
* [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
* [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
* 240.0.0.0/8
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* 255.255.255.255/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
* 0.0.0.0/0
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* 0.0.0.0/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* 172.16.1.0/24
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
* [0] [@4]: ipv4-glean: af_packet0
* 172.16.1.1/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
* [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
* 172.16.1.2/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
* [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
* 172.16.2.0/24
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
* [0] [@4]: ipv4-glean: af_packet1
* 172.16.2.1/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
* [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
* 224.0.0.0/8
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* 240.0.0.0/8
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* 255.255.255.255/32
* unicast-ip4-chain
* [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
* [0] [@0]: dpo-drop ip6
* @cliexend
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
{
.path = "set ip flow-hash",
.short_help =
"set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
.function = set_ip_flow_hash_command_fn,
};
/* *INDENT-ON* */
int
vnet_set_ip4_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;
ip4_main_t *ipm = &ip4_main;
ip_lookup_main_t *lm = &ipm->lookup_main;
vnet_classify_main_t *cm = &vnet_classify_main;
ip4_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 = ip4_interface_first_address (ipm, sw_if_index, NULL);
if (NULL != if_addr)
{
fib_prefix_t pfx = {
.fp_len = 32,
.fp_proto = FIB_PROTOCOL_IP4,
.fp_addr.ip4 = *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_IP4,
classify_dpo_create (DPO_PROTO_IP4, 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_ip_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_ip4_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 ip classify intfc GigabitEthernet2/0/0 table-index 1}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_ip_classify_command, static) =
{
.path = "set ip classify",
.short_help =
"set ip classify intfc <interface> table-index <classify-idx>",
.function = set_ip_classify_command_fn,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/