FD.io VPP  v20.09-64-g4f7b92f0a
Vector Packet Processing
dhcp4_packet.c
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1 /*
2  * dhcp4_packet.c: dhcp packet format functions
3  *
4  * Copyright (c) 2013 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <dhcp/dhcp4_packet.h>
19 #include <vnet/ip/format.h>
20 
21 u8 *
22 format_dhcp_packet_type (u8 * s, va_list * args)
23 {
24  dhcp_packet_type_t pt = va_arg (*args, dhcp_packet_type_t);
25 
26  switch (pt)
27  {
29  s = format (s, "discover");
30  break;
31  case DHCP_PACKET_OFFER:
32  s = format (s, "offer");
33  break;
35  s = format (s, "request");
36  break;
37  case DHCP_PACKET_ACK:
38  s = format (s, "ack");
39  break;
40  case DHCP_PACKET_NAK:
41  s = format (s, "nack");
42  break;
43  }
44  return (s);
45 }
46 
47 u8 *
48 format_dhcp_header (u8 * s, va_list * args)
49 {
50  dhcp_header_t *d = va_arg (*args, dhcp_header_t *);
51  u32 max_bytes = va_arg (*args, u32);
52  dhcp_option_t *o;
53  u32 tmp;
54 
55  s = format (s, "opcode:%s", (d->opcode == 1 ? "request" : "reply"));
56  s = format (s, " hw[type:%d addr-len:%d addr:%U]",
60  s = format (s, " hops%d", d->hops);
61  s = format (s, " transaction-ID:0x%x", d->transaction_identifier);
62  s = format (s, " seconds:%d", d->seconds);
63  s = format (s, " flags:0x%x", d->flags);
64  s = format (s, " client:%U", format_ip4_address, &d->client_ip_address);
65  s = format (s, " your:%U", format_ip4_address, &d->your_ip_address);
66  s = format (s, " server:%U", format_ip4_address, &d->server_ip_address);
67  s = format (s, " gateway:%U", format_ip4_address, &d->gateway_ip_address);
68  s = format (s, " cookie:%U", format_ip4_address, &d->magic_cookie);
69 
70  o = (dhcp_option_t *) d->options;
71 
72  while (o->option != 0xFF /* end of options */ &&
73  (u8 *) o < (u8 *) d + max_bytes)
74  {
75  switch (o->option)
76  {
77  case 53: /* dhcp message type */
78  tmp = o->data[0];
79  s =
80  format (s, ", option-53: type:%U", format_dhcp_packet_type, tmp);
81  break;
82  case 54: /* dhcp server address */
83  s = format (s, ", option-54: server:%U",
85  break;
86  case 58: /* lease renew time in seconds */
87  s = format (s, ", option-58: renewal:%d",
88  clib_host_to_net_u32 (o->data_as_u32[0]));
89  break;
90  case 1: /* subnet mask */
91  s = format (s, ", option-1: subnet-mask:%d",
92  clib_host_to_net_u32 (o->data_as_u32[0]));
93  break;
94  case 3: /* router address */
95  s = format (s, ", option-3: router:%U",
97  break;
98  case 6: /* domain server address */
99  s = format (s, ", option-6: domian-server:%U",
100  format_hex_bytes, o->data, o->length);
101  break;
102  case 12: /* hostname */
103  s = format (s, ", option-12: hostname:%U",
104  format_hex_bytes, o->data, o->length);
105  break;
106  default:
107  tmp = o->option;
108  s = format (s, " option-%d: skipped", tmp);
109  break;
110  }
111  o = (dhcp_option_t *) (((u8 *) o) + (o->length + 2));
112  }
113  return (s);
114 }
115 
116 /*
117  * fd.io coding-style-patch-verification: ON
118  *
119  * Local Variables:
120  * eval: (c-set-style "gnu")
121  * End:
122  */
u8 client_hardware_address[16]
Definition: dhcp4_packet.h:47
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
ip4_address_t server_ip_address
Definition: dhcp4_packet.h:45
unsigned char u8
Definition: types.h:56
u32 data_as_u32[0]
Definition: dhcp4_packet.h:29
format_function_t format_ip4_address
Definition: format.h:73
u8 * format_hex_bytes(u8 *s, va_list *va)
Definition: std-formats.c:84
u8 * format_dhcp_packet_type(u8 *s, va_list *args)
Definition: dhcp4_packet.c:22
unsigned int u32
Definition: types.h:88
u8 * format_dhcp_header(u8 *s, va_list *args)
Definition: dhcp4_packet.c:48
dhcp_option_t options[0]
Definition: dhcp4_packet.h:51
ip4_address_t client_ip_address
Definition: dhcp4_packet.h:43
ip4_address_t gateway_ip_address
Definition: dhcp4_packet.h:46
u32 transaction_identifier
Definition: dhcp4_packet.h:39
u8 hardware_address_length
Definition: dhcp4_packet.h:37
ip4_address_t magic_cookie
Definition: dhcp4_packet.h:50
dhcp_packet_type_t
Definition: dhcp4_packet.h:56
ip4_address_t your_ip_address
Definition: dhcp4_packet.h:44