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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* ip/ip6_input.c: IP v6 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.
*/
#ifndef included_ip6_input_h
#define included_ip6_input_h
#include <vnet/ip/ip.h>
#include <vnet/ip/icmp6.h>
typedef enum
{
IP6_INPUT_NEXT_DROP,
IP6_INPUT_NEXT_LOOKUP,
IP6_INPUT_NEXT_LOOKUP_MULTICAST,
IP6_INPUT_NEXT_ICMP_ERROR,
IP6_INPUT_N_NEXT,
} ip6_input_next_t;
always_inline void
ip6_input_check_x2 (vlib_main_t *vm, vlib_node_runtime_t *error_node,
vlib_buffer_t *p0, vlib_buffer_t *p1, ip6_header_t *ip0,
ip6_header_t *ip1, u32 *next0, u32 *next1)
{
u8 error0, error1;
error0 = error1 = IP6_ERROR_NONE;
/* Version != 6? Drop it. */
error0 =
(clib_net_to_host_u32 (ip0->ip_version_traffic_class_and_flow_label) >>
28) != 6 ?
IP6_ERROR_VERSION :
error0;
error1 =
(clib_net_to_host_u32 (ip1->ip_version_traffic_class_and_flow_label) >>
28) != 6 ?
IP6_ERROR_VERSION :
error1;
/* hop limit < 1? Drop it. for link-local broadcast packets,
* like dhcpv6 packets from client has hop-limit 1, which should not
* be dropped.
*/
error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
error1 = ip1->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error1;
/* L2 length must be at least minimal IP header. */
error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
error1 = p1->current_length < sizeof (ip1[0]) ? IP6_ERROR_TOO_SHORT : error1;
if (PREDICT_FALSE (error0 != IP6_ERROR_NONE))
{
p0->error = error_node->errors[error0];
if (error0 == IP6_ERROR_TIME_EXPIRED)
{
icmp6_error_set_vnet_buffer (
p0, ICMP6_time_exceeded,
ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
*next0 = IP6_INPUT_NEXT_ICMP_ERROR;
}
else
{
*next0 = IP6_INPUT_NEXT_DROP;
}
}
if (PREDICT_FALSE (error1 != IP6_ERROR_NONE))
{
p1->error = error_node->errors[error1];
if (error1 == IP6_ERROR_TIME_EXPIRED)
{
icmp6_error_set_vnet_buffer (
p1, ICMP6_time_exceeded,
ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
*next1 = IP6_INPUT_NEXT_ICMP_ERROR;
}
else
{
*next1 = IP6_INPUT_NEXT_DROP;
}
}
}
always_inline void
ip6_input_check_x1 (vlib_main_t *vm, vlib_node_runtime_t *error_node,
vlib_buffer_t *p0, ip6_header_t *ip0, u32 *next0)
{
u8 error0;
error0 = IP6_ERROR_NONE;
/* Version != 6? Drop it. */
error0 =
(clib_net_to_host_u32 (ip0->ip_version_traffic_class_and_flow_label) >>
28) != 6 ?
IP6_ERROR_VERSION :
error0;
/* hop limit < 1? Drop it. for link-local broadcast packets,
* like dhcpv6 packets from client has hop-limit 1, which should not
* be dropped.
*/
error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
/* L2 length must be at least minimal IP header. */
error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
if (PREDICT_FALSE (error0 != IP6_ERROR_NONE))
{
p0->error = error_node->errors[error0];
if (error0 == IP6_ERROR_TIME_EXPIRED)
{
icmp6_error_set_vnet_buffer (
p0, ICMP6_time_exceeded,
ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
*next0 = IP6_INPUT_NEXT_ICMP_ERROR;
}
else
{
*next0 = IP6_INPUT_NEXT_DROP;
}
}
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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