1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
/*
* PIM for Quagga
* Copyright (C) 2008 Everton da Silva Marques
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef PIM_MSG_H
#define PIM_MSG_H
#include <netinet/in.h>
#if PIM_IPV == 6
#include <netinet/ip6.h>
#endif
#include "pim_jp_agg.h"
#define PIM_HDR_LEN sizeof(struct pim_msg_header)
/*
Number Description
---------- ------------------
0 Reserved
1 IP (IP version 4)
2 IP6 (IP version 6)
From:
http://www.iana.org/assignments/address-family-numbers
*/
enum pim_msg_address_family {
PIM_MSG_ADDRESS_FAMILY_RESERVED,
PIM_MSG_ADDRESS_FAMILY_IPV4,
PIM_MSG_ADDRESS_FAMILY_IPV6,
};
/*
* pim_msg_hdr
* =========================
* PIM Header definition as per RFC 5059. N bit introduced to indicate
* do-not-forward option in PIM Boot strap Message.
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |PIM Ver| Type |N| Reserved | Checksum |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct pim_msg_header {
#if (BYTE_ORDER == LITTLE_ENDIAN)
uint8_t type : 4;
uint8_t ver : 4;
uint8_t reserved : 7;
uint8_t Nbit : 1; /* No Fwd Bit */
#elif (BYTE_ORDER == BIG_ENDIAN)
uint8_t ver : 4;
uint8_t type : 4;
uint8_t Nbit : 1; /* No Fwd Bit */
uint8_t reserved : 7;
#else
#error"Please set byte order"
#endif
uint16_t checksum;
} __attribute__((packed));
struct pim_encoded_ipv4_unicast {
uint8_t family;
uint8_t reserved;
struct in_addr addr;
} __attribute__((packed));
struct pim_encoded_ipv6_unicast {
uint8_t family;
uint8_t reserved;
struct in6_addr addr;
} __attribute__((packed));
/*
* Encoded Group format. RFC 4601 Sec 4.9.1
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Addr Family | Encoding Type |B| Reserved |Z| Mask Len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Group multicast Address
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...
*/
struct pim_encoded_group_ipv4 {
uint8_t family;
uint8_t ne;
#if (BYTE_ORDER == LITTLE_ENDIAN)
uint8_t sz : 1; /* scope zone bit */
uint8_t reserved : 6; /* Reserved */
uint8_t bidir : 1; /* Bidir bit */
#elif (BYTE_ORDER == BIG_ENDIAN)
uint8_t bidir : 1; /* Bidir bit */
uint8_t reserved : 6; /* Reserved */
uint8_t sz : 1; /* scope zone bit */
#else
#error"Please set byte order"
#endif
uint8_t mask;
struct in_addr addr;
} __attribute__((packed));
struct pim_encoded_group_ipv6 {
uint8_t family;
uint8_t ne;
#if (BYTE_ORDER == LITTLE_ENDIAN)
uint8_t sz : 1; /* scope zone bit */
uint8_t reserved : 6; /* Reserved */
uint8_t bidir : 1; /* Bidir bit */
#elif (BYTE_ORDER == BIG_ENDIAN)
uint8_t bidir : 1; /* Bidir bit */
uint8_t reserved : 6; /* Reserved */
uint8_t sz : 1; /* scope zone bit */
#else
#error "Please set byte order"
#endif
uint8_t mask;
struct in6_addr addr;
} __attribute__((packed));
/*
* Encoded Source format. RFC 4601 Sec 4.9.1
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Source Address
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...
*/
struct pim_encoded_source_ipv4 {
uint8_t family;
uint8_t ne;
uint8_t bits;
uint8_t mask;
struct in_addr addr;
} __attribute__((packed));
struct pim_encoded_source_ipv6 {
uint8_t family;
uint8_t ne;
uint8_t bits;
uint8_t mask;
struct in6_addr addr;
} __attribute__((packed));
/* clang-format off */
#if PIM_IPV == 4
typedef struct pim_encoded_ipv4_unicast pim_encoded_unicast;
typedef struct pim_encoded_group_ipv4 pim_encoded_group;
typedef struct pim_encoded_source_ipv4 pim_encoded_source;
typedef struct ip ipv_hdr;
#define IPV_SRC(ip_hdr) ((ip_hdr))->ip_src
#define IPV_DST(ip_hdr) ((ip_hdr))->ip_dst
#define IPV_LEN(ip_hdr) ((ip_hdr))->ip_len
#else
typedef struct pim_encoded_ipv6_unicast pim_encoded_unicast;
typedef struct pim_encoded_group_ipv6 pim_encoded_group;
typedef struct pim_encoded_source_ipv6 pim_encoded_source;
typedef struct ip6_hdr ipv_hdr;
#define IPV_SRC(ip_hdr) ((ip_hdr))->ip6_src
#define IPV_DST(ip_hdr) ((ip_hdr))->ip6_dst
#define IPV_LEN(ip_hdr) ((ip_hdr))->ip6_plen
#endif
/* clang-format on */
struct pim_jp_groups {
pim_encoded_group g;
uint16_t joins;
uint16_t prunes;
pim_encoded_source s[1];
} __attribute__((packed));
struct pim_jp {
struct pim_msg_header header;
pim_encoded_unicast addr;
uint8_t reserved;
uint8_t num_groups;
uint16_t holdtime;
struct pim_jp_groups groups[1];
} __attribute__((packed));
#if PIM_IPV == 4
static inline pim_sgaddr pim_sgaddr_from_iphdr(const void *iphdr)
{
const struct ip *ipv4_hdr = iphdr;
pim_sgaddr sg;
sg.src = ipv4_hdr->ip_src;
sg.grp = ipv4_hdr->ip_dst;
return sg;
}
#else
static inline pim_sgaddr pim_sgaddr_from_iphdr(const void *iphdr)
{
const struct ip6_hdr *ipv6_hdr = iphdr;
pim_sgaddr sg;
sg.src = ipv6_hdr->ip6_src;
sg.grp = ipv6_hdr->ip6_dst;
return sg;
}
#endif
void pim_msg_build_header(pim_addr src, pim_addr dst, uint8_t *pim_msg,
size_t pim_msg_size, uint8_t pim_msg_type,
bool no_fwd);
uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf, struct in_addr addr);
uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf, struct in_addr addr);
#define PIM_ENCODE_SPARSE_BIT 0x04
#define PIM_ENCODE_WC_BIT 0x02
#define PIM_ENCODE_RPT_BIT 0x01
uint8_t *pim_msg_addr_encode_ipv4_source(uint8_t *buf, struct in_addr addr,
uint8_t bits);
uint8_t *pim_msg_addr_encode_ipv6_ucast(uint8_t *buf, struct in6_addr addr);
uint8_t *pim_msg_addr_encode_ipv6_group(uint8_t *buf, struct in6_addr addr);
uint8_t *pim_msg_addr_encode_ipv6_source(uint8_t *buf, struct in6_addr addr,
uint8_t bits);
uint8_t *pim_msg_addr_encode_ucast(uint8_t *buf, pim_addr addr);
uint8_t *pim_msg_addr_encode_group(uint8_t *buf, pim_addr addr);
uint8_t *pim_msg_addr_encode_source(uint8_t *buf, pim_addr addr, uint8_t bits);
size_t pim_msg_get_jp_group_size(struct list *sources);
size_t pim_msg_build_jp_groups(struct pim_jp_groups *grp,
struct pim_jp_agg_group *sgs, size_t size);
#endif /* PIM_MSG_H */
|
