/* * 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> extern char *ip6_error_strings[]; 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)) { 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)) { 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)) { 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: */