FD.io VPP  v17.07.01-10-g3be13f0
Vector Packet Processing
ip_frag.h
Go to the documentation of this file.
1 /*---------------------------------------------------------------------------
2  * Copyright (c) 2009-2014 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  *---------------------------------------------------------------------------
15  */
16 /*
17  * IPv4 and IPv6 Fragmentation Nodes
18  *
19  * A packet sent to those nodes require the following
20  * buffer attributes to be set:
21  * ip_frag.header_offset :
22  * Where to find the IPv4 (or IPv6) header in the packet. Previous
23  * bytes are left untouched and copied in every fragment. The fragments
24  * are then appended. This option is used for fragmented packets
25  * that are encapsulated.
26  * ip_frag.mtu :
27  * Maximum size of IP packets, header included, but ignoring
28  * the 'ip_frag.header_offset' copied bytes.
29  * ip_frag.next_index :
30  * One of ip_frag_next_t, indicating to which exit node the fragments
31  * should be sent to.
32  *
33  */
34 
35 #ifndef IP_FRAG_H
36 #define IP_FRAG_H
37 
38 #include <vnet/vnet.h>
39 
40 #define IP_FRAG_FLAG_IP4_HEADER 0x01 //Encapsulating IPv4 header
41 #define IP_FRAG_FLAG_IP6_HEADER 0x02 //Encapsulating IPv6 header
42 
43 #define IP4_FRAG_NODE_NAME "ip4-frag"
44 #define IP6_FRAG_NODE_NAME "ip6-frag"
45 
48 
49 typedef enum
50 {
57 
58 typedef enum
59 {
65 
66 #define foreach_ip_frag_error \
67  /* Must be first. */ \
68  _(NONE, "packet fragmented") \
69  _(SMALL_PACKET, "packet smaller than MTU") \
70  _(FRAGMENT_SENT, "number of sent fragments") \
71  _(CANT_FRAGMENT_HEADER, "can't fragment header") \
72  _(DONT_FRAGMENT_SET, "can't fragment this packet") \
73  _(MALFORMED, "malformed packet") \
74  _(MEMORY, "could not allocate buffer") \
75  _(UNKNOWN, "unknown error")
76 
77 typedef enum
78 {
79 #define _(sym,str) IP_FRAG_ERROR_##sym,
81 #undef _
84 
86  u8 next_index, u8 flags);
87 
88 #endif /* ifndef IP_FRAG_H */
89 
90 /*
91  * fd.io coding-style-patch-verification: ON
92  *
93  * Local Variables:
94  * eval: (c-set-style "gnu")
95  * End:
96  */
vlib_node_registration_t ip4_frag_node
(constructor) VLIB_REGISTER_NODE (ip4_frag_node)
Definition: ip_frag.c:535
#define foreach_ip_frag_error
Definition: ip_frag.h:66
struct _vlib_node_registration vlib_node_registration_t
vlib_node_registration_t ip6_frag_node
(constructor) VLIB_REGISTER_NODE (ip6_frag_node)
Definition: ip_frag.c:556
ip_frag_error_t
Definition: ip_frag.h:77
template key/value backing page structure
Definition: bihash_doc.h:44
unsigned short u16
Definition: types.h:57
unsigned char u8
Definition: types.h:56
void ip_frag_set_vnet_buffer(vlib_buffer_t *b, u16 offset, u16 mtu, u8 next_index, u8 flags)
Definition: ip_frag.c:178
ip6_frag_next_t
Definition: ip_frag.h:58
u32 flags
Definition: vhost-user.h:76
ip4_frag_next_t
Definition: ip_frag.h:49