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/*---------------------------------------------------------------------------
* Copyright (c) 2009-2014 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.
*---------------------------------------------------------------------------
*/
/*
* IPv4 and IPv6 Fragmentation Nodes
*
* A packet sent to those nodes require the following
* buffer attributes to be set:
* ip_frag.header_offset :
* Where to find the IPv4 (or IPv6) header in the packet. Previous
* bytes are left untouched and copied in every fragment. The fragments
* are then appended. This option is used for fragmented packets
* that are encapsulated.
* ip_frag.mtu :
* Maximum size of IP packets, header included, but ignoring
* the 'ip_frag.header_offset' copied bytes.
* ip_frag.next_index :
* One of ip_frag_next_t, indicating to which exit node the fragments
* should be sent to.
*
*/
#ifndef IP_FRAG_H
#define IP_FRAG_H
#include <vnet/vnet.h>
#define IP_FRAG_FLAG_IP4_HEADER 0x01 //Encapsulating IPv4 header
#define IP_FRAG_FLAG_IP6_HEADER 0x02 //Encapsulating IPv6 header
#define IP_FRAG_FLAG_MPLS_HEADER 0x04 //Encapsulating MPLS header
#define IP4_FRAG_NODE_NAME "ip4-frag"
#define IP6_FRAG_NODE_NAME "ip6-frag"
extern vlib_node_registration_t ip4_frag_node;
extern vlib_node_registration_t ip6_frag_node;
typedef enum
{
IP4_FRAG_NEXT_IP4_REWRITE,
IP4_FRAG_NEXT_IP4_LOOKUP,
IP4_FRAG_NEXT_IP6_LOOKUP,
IP4_FRAG_NEXT_MPLS_OUTPUT,
IP4_FRAG_NEXT_ICMP_ERROR,
IP4_FRAG_NEXT_DROP,
IP4_FRAG_N_NEXT
} ip4_frag_next_t;
typedef enum
{
IP6_FRAG_NEXT_IP4_LOOKUP,
IP6_FRAG_NEXT_IP6_LOOKUP,
IP6_FRAG_NEXT_IP6_REWRITE,
IP6_FRAG_NEXT_MPLS_OUTPUT,
IP6_FRAG_NEXT_DROP,
IP6_FRAG_N_NEXT
} ip6_frag_next_t;
#define foreach_ip_frag_error \
/* Must be first. */ \
_(NONE, "packet fragmented") \
_(SMALL_PACKET, "packet smaller than MTU") \
_(FRAGMENT_SENT, "number of sent fragments") \
_(CANT_FRAGMENT_HEADER, "can't fragment header") \
_(DONT_FRAGMENT_SET, "can't fragment this packet") \
_(MALFORMED, "malformed packet") \
_(MEMORY, "could not allocate buffer") \
_(UNKNOWN, "unknown error")
typedef enum
{
#define _(sym,str) IP_FRAG_ERROR_##sym,
foreach_ip_frag_error
#undef _
IP_FRAG_N_ERROR,
} ip_frag_error_t;
void ip_frag_set_vnet_buffer (vlib_buffer_t * b, u16 mtu,
u8 next_index, u8 flags);
void
ip4_frag_do_fragment (vlib_main_t * vm, u32 pi, u32 ** buffer,
ip_frag_error_t * error);
void
ip6_frag_do_fragment (vlib_main_t * vm, u32 pi, u32 ** buffer,
ip_frag_error_t * error);
#endif /* ifndef IP_FRAG_H */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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