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Vector Packet Processing
ip_frag.h
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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 {
58 
59 typedef enum
60 {
67 
68 #define foreach_ip_frag_error \
69  /* Must be first. */ \
70  _(NONE, "packet fragmented") \
71  _(SMALL_PACKET, "packet smaller than MTU") \
72  _(FRAGMENT_SENT, "number of sent fragments") \
73  _(CANT_FRAGMENT_HEADER, "can't fragment header") \
74  _(DONT_FRAGMENT_SET, "can't fragment this packet") \
75  _(MALFORMED, "malformed packet") \
76  _(MEMORY, "could not allocate buffer") \
77  _(UNKNOWN, "unknown error")
78 
79 typedef enum
80 {
81 #define _(sym,str) IP_FRAG_ERROR_##sym,
83 #undef _
86 
88  u8 next_index, u8 flags);
89 void
90 ip4_frag_do_fragment (vlib_main_t * vm, u32 pi, u32 ** buffer,
91  ip_frag_error_t * error);
92 void
93 ip6_frag_do_fragment (vlib_main_t * vm, u32 pi, u32 ** buffer,
94  ip_frag_error_t * error);
95 #endif /* ifndef IP_FRAG_H */
96 
97 /*
98  * fd.io coding-style-patch-verification: ON
99  *
100  * Local Variables:
101  * eval: (c-set-style "gnu")
102  * End:
103  */
void ip_frag_set_vnet_buffer(vlib_buffer_t *b, u16 mtu, u8 next_index, u8 flags)
Definition: ip_frag.c:243
vlib_node_registration_t ip4_frag_node
(constructor) VLIB_REGISTER_NODE (ip4_frag_node)
Definition: ip_frag.c:509
u32 flags
Definition: vhost_user.h:115
#define foreach_ip_frag_error
Definition: ip_frag.h:68
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:531
unsigned int u32
Definition: types.h:88
void ip4_frag_do_fragment(vlib_main_t *vm, u32 pi, u32 **buffer, ip_frag_error_t *error)
Definition: ip_frag.c:97
unsigned short u16
Definition: types.h:57
vlib_main_t * vm
Definition: buffer.c:301
ip_frag_error_t
Definition: ip_frag.h:79
struct _vlib_node_registration vlib_node_registration_t
ip6_frag_next_t
Definition: ip_frag.h:59
void ip6_frag_do_fragment(vlib_main_t *vm, u32 pi, u32 **buffer, ip_frag_error_t *error)
Definition: ip_frag.c:392
ip4_frag_next_t
Definition: ip_frag.h:49