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