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Vector Packet Processing
ip_frag.h
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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:
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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
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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 {
59 
60 #define foreach_ip_frag_error \
61  /* Must be first. */ \
62  _(NONE, "packet fragmented") \
63  _(SMALL_PACKET, "packet smaller than MTU") \
64  _(FRAGMENT_SENT, "number of sent fragments") \
65  _(CANT_FRAGMENT_HEADER, "can't fragment header") \
66  _(DONT_FRAGMENT_SET, "can't fragment this packet") \
67  _(MALFORMED, "malformed packet") \
68  _(MEMORY, "could not allocate buffer") \
69  _(UNKNOWN, "unknown error")
70 
71 typedef enum
72 {
73 #define _(sym,str) IP_FRAG_ERROR_##sym,
75 #undef _
78 
80  u8 next_index, u8 flags);
81 
83  u32 from_bi,
84  u16 mtu,
85  u16 encapsize, u32 ** buffer);
87  u32 from_bi,
88  u16 mtu,
89  u16 encapsize, u32 ** buffer);
90 
91 #endif /* ifndef IP_FRAG_H */
92 
93 /*
94  * fd.io coding-style-patch-verification: ON
95  *
96  * Local Variables:
97  * eval: (c-set-style "gnu")
98  * End:
99  */
void ip_frag_set_vnet_buffer(vlib_buffer_t *b, u16 mtu, u8 next_index, u8 flags)
Definition: ip_frag.c:239
vlib_node_registration_t ip4_frag_node
(constructor) VLIB_REGISTER_NODE (ip4_frag_node)
Definition: ip_frag.c:513
#define foreach_ip_frag_error
Definition: ip_frag.h:60
unsigned char u8
Definition: types.h:56
vlib_node_registration_t ip6_frag_node
(constructor) VLIB_REGISTER_NODE (ip6_frag_node)
Definition: ip_frag.c:536
ip_frag_error_t ip4_frag_do_fragment(vlib_main_t *vm, u32 from_bi, u16 mtu, u16 encapsize, u32 **buffer)
Definition: ip_frag.c:94
unsigned int u32
Definition: types.h:88
ip_frag_next_t
Definition: ip_frag.h:49
unsigned short u16
Definition: types.h:57
vlib_main_t * vm
Definition: in2out_ed.c:1599
u32 flags
Definition: vhost_user.h:248
ip_frag_error_t
Definition: ip_frag.h:71
struct _vlib_node_registration vlib_node_registration_t
VLIB buffer representation.
Definition: buffer.h:102
ip_frag_error_t ip6_frag_do_fragment(vlib_main_t *vm, u32 from_bi, u16 mtu, u16 encapsize, u32 **buffer)
Definition: ip_frag.c:382