3 * Copyright (C) 2008 Everton da Silva Marques
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.
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.
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
34 #include "pim_iface.h"
37 #include "pim_register.h"
38 #include "pim_jp_agg.h"
41 void pim_msg_build_header(uint8_t *pim_msg
, size_t pim_msg_size
,
42 uint8_t pim_msg_type
, bool no_fwd
)
44 struct pim_msg_header
*header
= (struct pim_msg_header
*)pim_msg
;
49 header
->ver
= PIM_PROTO_VERSION
;
50 header
->type
= pim_msg_type
;
51 header
->Nbit
= no_fwd
;
57 * The checksum for Registers is done only on the first 8 bytes of the
59 * including the PIM header and the next 4 bytes, excluding the data
62 if (pim_msg_type
== PIM_MSG_TYPE_REGISTER
)
63 header
->checksum
= in_cksum(pim_msg
, PIM_MSG_REGISTER_LEN
);
65 header
->checksum
= in_cksum(pim_msg
, pim_msg_size
);
68 uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf
, struct in_addr addr
)
70 buf
[0] = PIM_MSG_ADDRESS_FAMILY_IPV4
; /* addr family */
71 buf
[1] = '\0'; /* native encoding */
72 memcpy(buf
+ 2, &addr
, sizeof(struct in_addr
));
74 return buf
+ PIM_ENCODED_IPV4_UCAST_SIZE
;
77 uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf
, struct in_addr addr
)
79 buf
[0] = PIM_MSG_ADDRESS_FAMILY_IPV4
; /* addr family */
80 buf
[1] = '\0'; /* native encoding */
81 buf
[2] = '\0'; /* reserved */
82 buf
[3] = 32; /* mask len */
83 memcpy(buf
+ 4, &addr
, sizeof(struct in_addr
));
85 return buf
+ PIM_ENCODED_IPV4_GROUP_SIZE
;
88 uint8_t *pim_msg_addr_encode_ipv4_source(uint8_t *buf
, struct in_addr addr
,
91 buf
[0] = PIM_MSG_ADDRESS_FAMILY_IPV4
; /* addr family */
92 buf
[1] = '\0'; /* native encoding */
94 buf
[3] = 32; /* mask len */
95 memcpy(buf
+ 4, &addr
, sizeof(struct in_addr
));
97 return buf
+ PIM_ENCODED_IPV4_SOURCE_SIZE
;
100 uint8_t *pim_msg_addr_encode_ipv6_source(uint8_t *buf
, struct in6_addr addr
,
103 buf
[0] = PIM_MSG_ADDRESS_FAMILY_IPV6
; /* addr family */
104 buf
[1] = '\0'; /* native encoding */
106 buf
[3] = 128; /* mask len */
109 memcpy(buf
, &addr
, sizeof(addr
));
115 uint8_t *pim_msg_addr_encode_ipv6_ucast(uint8_t *buf
, struct in6_addr addr
)
117 buf
[0] = PIM_MSG_ADDRESS_FAMILY_IPV6
; /* addr family */
118 buf
[1] = '\0'; /* native encoding */
121 memcpy(buf
, &addr
, sizeof(addr
));
127 uint8_t *pim_msg_addr_encode_ipv6_group(uint8_t *buf
, struct in6_addr addr
)
129 buf
[0] = PIM_MSG_ADDRESS_FAMILY_IPV6
; /* addr family */
130 buf
[1] = '\0'; /* native encoding */
131 buf
[2] = '\0'; /* reserved */
132 buf
[3] = 128; /* mask len */
135 memcpy(buf
, &addr
, sizeof(addr
));
142 #define pim_msg_addr_encode(what) pim_msg_addr_encode_ipv4_##what
144 #define pim_msg_addr_encode(what) pim_msg_addr_encode_ipv6_##what
147 uint8_t *pim_msg_addr_encode_ucast(uint8_t *buf
, pim_addr addr
)
149 return pim_msg_addr_encode(ucast
)(buf
, addr
);
152 uint8_t *pim_msg_addr_encode_group(uint8_t *buf
, pim_addr addr
)
154 return pim_msg_addr_encode(group
)(buf
, addr
);
157 uint8_t *pim_msg_addr_encode_source(uint8_t *buf
, pim_addr addr
, uint8_t bits
)
159 return pim_msg_addr_encode(source
)(buf
, addr
, bits
);
163 * For the given 'struct pim_jp_sources' list
164 * determine the size_t it would take up.
166 size_t pim_msg_get_jp_group_size(struct list
*sources
)
168 struct pim_jp_sources
*js
;
174 size
+= sizeof(pim_encoded_group
);
175 size
+= 4; // Joined sources (2) + Pruned Sources (2)
177 size
+= sizeof(pim_encoded_source
) * sources
->count
;
179 js
= listgetdata(listhead(sources
));
180 if (js
&& pim_addr_is_any(js
->up
->sg
.src
) && js
->is_join
) {
181 struct pim_upstream
*child
, *up
;
182 struct listnode
*up_node
;
185 if (PIM_DEBUG_PIM_PACKETS
)
187 "%s: Considering (%s) children for (S,G,rpt) prune",
188 __func__
, up
->sg_str
);
190 for (ALL_LIST_ELEMENTS_RO(up
->sources
, up_node
, child
)) {
191 if (!PIM_UPSTREAM_FLAG_TEST_USE_RPT(child
->flags
)) {
192 /* If we are using SPT and the SPT and RPT IIFs
193 * are different we can prune the source off
195 * If RPF_interface(S) is not resolved hold
196 * decision to prune as SPT may end up on the
197 * same IIF as RPF_interface(RP).
199 if (child
->rpf
.source_nexthop
.interface
&&
200 !pim_rpf_is_same(&up
->rpf
,
202 size
+= sizeof(pim_encoded_source
);
203 PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(
205 if (PIM_DEBUG_PIM_PACKETS
)
207 "%s: SPT Bit and RPF'(%s) != RPF'(S,G): Add Prune (%s,rpt) to compound message",
208 __func__
, up
->sg_str
,
210 } else if (PIM_DEBUG_PIM_PACKETS
)
212 "%s: SPT Bit and RPF'(%s) == RPF'(S,G): Not adding Prune for (%s,rpt)",
213 __func__
, up
->sg_str
,
215 } else if (pim_upstream_empty_inherited_olist(child
)) {
216 /* S is supposed to be forwarded along the RPT
217 * but it's inherited OIL is empty. So just
220 size
+= sizeof(pim_encoded_source
);
221 PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(
223 if (PIM_DEBUG_PIM_PACKETS
)
225 "%s: inherited_olist(%s,rpt) is NULL, Add Prune to compound message",
226 __func__
, child
->sg_str
);
227 } else if (PIM_DEBUG_PIM_PACKETS
)
229 "%s: Do not add Prune %s to compound message %s",
230 __func__
, child
->sg_str
, up
->sg_str
);
236 size_t pim_msg_build_jp_groups(struct pim_jp_groups
*grp
,
237 struct pim_jp_agg_group
*sgs
, size_t size
)
239 struct listnode
*node
, *nnode
;
240 struct pim_jp_sources
*source
;
241 struct pim_upstream
*up
= NULL
;
246 memset(grp
, 0, size
);
247 pim_msg_addr_encode_group((uint8_t *)&grp
->g
, sgs
->group
);
249 for (ALL_LIST_ELEMENTS(sgs
->sources
, node
, nnode
, source
)) {
250 /* number of joined/pruned sources */
256 if (pim_addr_is_any(source
->up
->sg
.src
)) {
257 struct pim_instance
*pim
= source
->up
->channel_oil
->pim
;
258 struct pim_rpf
*rpf
= pim_rp_g(pim
, source
->up
->sg
.grp
);
259 bits
= PIM_ENCODE_SPARSE_BIT
| PIM_ENCODE_WC_BIT
260 | PIM_ENCODE_RPT_BIT
;
261 stosend
= pim_addr_from_prefix(&rpf
->rpf_addr
);
262 /* Only Send SGRpt in case of *,G Join */
266 bits
= PIM_ENCODE_SPARSE_BIT
;
267 stosend
= source
->up
->sg
.src
;
270 pim_msg_addr_encode_source((uint8_t *)&grp
->s
[tgroups
], stosend
,
276 struct pim_upstream
*child
;
278 for (ALL_LIST_ELEMENTS(up
->sources
, node
, nnode
, child
)) {
279 if (PIM_UPSTREAM_FLAG_TEST_SEND_SG_RPT_PRUNE(
281 pim_msg_addr_encode_source(
282 (uint8_t *)&grp
->s
[tgroups
],
284 PIM_ENCODE_SPARSE_BIT
|
287 PIM_UPSTREAM_FLAG_UNSET_SEND_SG_RPT_PRUNE(
294 grp
->joins
= htons(grp
->joins
);
295 grp
->prunes
= htons(grp
->prunes
);