"""
Neighbour Entries
object abstractions for ARP and ND
"""
from ipaddress import ip_address
from vpp_object import VppObject
from vpp_papi import mac_pton, VppEnum
try:
text_type = unicode
except NameError:
text_type = str
def /*
* 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_input.c: IP v4 input node
*
* 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/ip/ip4_input.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ppp/ppp.h>
#include <vnet/hdlc/hdlc.h>
typedef struct
{
u8 packet_data[64];
} ip4_input_trace_t;
static u8 *
format_ip4_input_trace (u8 * s, va_list * va)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
ip4_input_trace_t *t = va_arg (*va, ip4_input_trace_t *);
s = format (s, "%U",
format_ip4_header, t->packet_data, sizeof (t->packet_data));
return s;
}
/* Validate IP v4 packets and pass them either to forwarding code
or drop/punt exception packets. */
always_inline uword
ip4_input_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, int verify_checksum)
{
ip4_main_t *im = &ip4_main;
vnet_main_t *vnm = vnet_get_main ();
ip_lookup_main_t *lm = &im->lookup_main;
u32 n_left_from, *from, *to_next;
ip4_input_next_t next_index;
vlib_node_runtime_t *error_node =
vlib_node_get_runtime (vm, ip4_input_node.index);
vlib_simple_counter_main_t *cm;
u32 thread_index = vlib_get_thread_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)
vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
/* stride */ 1,
sizeof (ip4_input_trace_t));
cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
VNET_INTERFACE_COUNTER_IP4);
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)
{
vlib_buffer_t *p0, *p1;
ip4_header_t *ip0, *ip1;
u32 sw_if_index0, pi0, next0;
u32 sw_if_index1, pi1, next1;
u8 arc0, arc1;
/* 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 (ip1[0]), LOAD);
}
to_next[0] = pi0 = from[0];
to_next[1] = pi1 = from[1];
from += 2;
to_next += 2;
n_left_from -= 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);
sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
if (PREDICT_FALSE (ip4_address_is_multicast (&ip0->dst_address)))
{
arc0 = lm->mcast_feature_arc_index;
next0 = IP4_INPUT_NEXT_LOOKUP_MULTICAST;
}
else
{
arc0 = lm->ucast_feature_arc_index;
next0 = IP4_INPUT_NEXT_LOOKUP;
}
if (PREDICT_FALSE (ip4_address_is_multicast (&ip1->dst_address)))
{
arc1 = lm->mcast_feature_arc_index;
next1 = IP4_INPUT_NEXT_LOOKUP_MULTICAST;
}
else
{
arc1 = lm->ucast_feature_arc_index;
next1 = IP4_INPUT_NEXT_LOOKUP;
}
vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
vnet_buffer (p1)->ip.adj_index[VLIB_RX] = ~0;
vnet_feature_arc_start (arc0, sw_if_index0, &next0, p0);
vnet_feature_arc_start (arc1, sw_if_index1, &next1, p1);
vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
vlib_increment_simple_counter (cm, thread_index, sw_if_index1, 1);
ip4_input_check_x2 (vm, error_node,
p0, p1, ip0, ip1,
&next0, &next1, verify_checksum);
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;
u32 sw_if_index0, pi0, next0;
u8 arc0;
pi0 = from[0];
to_next[0] = pi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
p0 = vlib_get_buffer (vm, pi0);
ip0 = vlib_buffer_get_current (p0);
sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
if (PREDICT_FALSE (ip4_address_is_multicast (&ip0->dst_address)))
{
arc0 = lm->mcast_feature_arc_index;
next0 = IP4_INPUT_NEXT_LOOKUP_MULTICAST;
}
else
{
arc0 = lm->ucast_feature_arc_index;
next0 = IP4_INPUT_NEXT_LOOKUP;
}
vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
vnet_feature_arc_start (arc0, sw_if_index0, &next0, p0);
vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
ip4_input_check_x1 (vm, error_node, p0, ip0, &next0,
verify_checksum);
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;
}
/** \brief IPv4 input node.
@node ip4-input
This is the IPv4 input node: validates ip4 header checksums,
verifies ip header lengths, discards pkts with expired TTLs,
and sends pkts to the set of ip feature nodes configured on
the rx interface.
@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:
- vnet_feature_config_main_t cm corresponding to each pkt's dst address unicast /
multicast status.
- <code>b->current_config_index</code> corresponding to each pkt's
rx sw_if_index.
- This sets the per-packet graph trajectory, ensuring that
each packet visits the per-interface features in order.
- <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.
@em Sets:
- <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
- The lookup result adjacency index.
<em>Next Indices:</em>
- Dispatches pkts to the (first) feature node:
<code> vnet_get_config_data (... &next0 ...); </code>
or @c error-drop
*/
static uword
ip4_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip4_input_inline (vm, node, frame, /* verify_checksum */ 1);
}
static uword
ip4_input_no_checksum (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip4_input_inline (vm, node, frame, /* verify_checksum */ 0);
}
char *ip4_error_strings[] = {
#define _(sym,string) string,
foreach_ip4_error
#undef _
};
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_input_node) = {
.function = ip4_input,
.name = "ip4-input",
.vector_size = sizeof (u32),
.n_errors = IP4_N_ERROR,
.error_strings = ip4_error_strings,
.n_next_nodes = IP4_INPUT_N_NEXT,
.next_nodes = {
[IP4_INPUT_NEXT_DROP] = "error-drop",
[IP4_INPUT_NEXT_PUNT] = "error-punt",
[IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
[IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-mfib-forward-lookup",
[IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
[IP4_INPUT_NEXT_REASSEMBLY] = "ip4-reassembly",
},
.format_buffer = format_ip4_header,
.format_trace = format_ip4_input_trace,
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip4_input_node, ip4_input);
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_input_no_checksum_node,static) = {
.function = ip4_input_no_checksum,
.name = "ip4-input-no-checksum",
.vector_size = sizeof (u32),
.n_next_nodes = IP4_INPUT_N_NEXT,
.next_nodes = {
[IP4_INPUT_NEXT_DROP] = "error-drop",
[IP4_INPUT_NEXT_PUNT] = "error-punt",
[IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
[IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-mfib-forward-lookup",
[IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
[IP4_INPUT_NEXT_REASSEMBLY] = "ip4-reassembly",
},
.format_buffer = format_ip4_header,
.format_trace = format_ip4_input_trace,
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip4_input_no_checksum_node,
ip4_input_no_checksum);
static clib_error_t *
ip4_init (vlib_main_t * vm)
{
clib_error_t *error;
ethernet_register_input_type (vm, ETHERNET_TYPE_IP4, ip4_input_node.index);
ppp_register_input_protocol (vm, PPP_PROTOCOL_ip4, ip4_input_node.index);
hdlc_register_input_protocol (vm, HDLC_PROTOCOL_ip4, ip4_input_node.index);
{
pg_node_t *pn;
pn = pg_get_node (ip4_input_node.index);
pn->unformat_edit = unformat_pg_ip4_header;
pn = pg_get_node (ip4_input_no_checksum_node.index);
pn->unformat_edit = unformat_pg_ip4_header;
}
if ((error = vlib_call_init_function (vm, ip4_cli_init)))
return error;
if ((error = vlib_call_init_function (vm, ip4_source_check_init)))
return error;
if ((error = vlib_call_init_function
(vm, ip4_source_and_port_range_check_init)))
return error;
/* Set flow hash to something non-zero. */
ip4_main.flow_hash_seed = 0xdeadbeef;
/* Default TTL for packets we generate. */
ip4_main.host_config.ttl = 64;
return error;
}
VLIB_INIT_FUNCTION (ip4_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
