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
;
101 * For the given 'struct pim_jp_sources' list
102 * determine the size_t it would take up.
104 size_t pim_msg_get_jp_group_size(struct list
*sources
)
106 struct pim_jp_sources
*js
;
112 size
+= sizeof(struct pim_encoded_group_ipv4
);
113 size
+= 4; // Joined sources (2) + Pruned Sources (2)
115 size
+= sizeof(struct pim_encoded_source_ipv4
) * sources
->count
;
117 js
= listgetdata(listhead(sources
));
118 if (js
&& js
->up
->sg
.src
.s_addr
== INADDR_ANY
&& js
->is_join
) {
119 struct pim_upstream
*child
, *up
;
120 struct listnode
*up_node
;
123 if (PIM_DEBUG_PIM_PACKETS
)
125 "%s: Considering (%s) children for (S,G,rpt) prune",
126 __func__
, up
->sg_str
);
128 for (ALL_LIST_ELEMENTS_RO(up
->sources
, up_node
, child
)) {
129 if (!PIM_UPSTREAM_FLAG_TEST_USE_RPT(child
->flags
)) {
130 /* If we are using SPT and the SPT and RPT IIFs
131 * are different we can prune the source off
133 * If RPF_interface(S) is not resolved hold
134 * decision to prune as SPT may end up on the
135 * same IIF as RPF_interface(RP).
137 if (child
->rpf
.source_nexthop
.interface
&&
138 !pim_rpf_is_same(&up
->rpf
,
141 struct pim_encoded_source_ipv4
);
142 PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(
144 if (PIM_DEBUG_PIM_PACKETS
)
146 "%s: SPT Bit and RPF'(%s) != RPF'(S,G): Add Prune (%s,rpt) to compound message",
147 __func__
, up
->sg_str
,
149 } else if (PIM_DEBUG_PIM_PACKETS
)
151 "%s: SPT Bit and RPF'(%s) == RPF'(S,G): Not adding Prune for (%s,rpt)",
152 __func__
, up
->sg_str
,
154 } else if (pim_upstream_empty_inherited_olist(child
)) {
155 /* S is supposed to be forwarded along the RPT
156 * but it's inherited OIL is empty. So just
160 struct pim_encoded_source_ipv4
);
161 PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(
163 if (PIM_DEBUG_PIM_PACKETS
)
165 "%s: inherited_olist(%s,rpt) is NULL, Add Prune to compound message",
166 __func__
, child
->sg_str
);
167 } else if (PIM_DEBUG_PIM_PACKETS
)
169 "%s: Do not add Prune %s to compound message %s",
170 __func__
, child
->sg_str
, up
->sg_str
);
176 size_t pim_msg_build_jp_groups(struct pim_jp_groups
*grp
,
177 struct pim_jp_agg_group
*sgs
, size_t size
)
179 struct listnode
*node
, *nnode
;
180 struct pim_jp_sources
*source
;
181 struct pim_upstream
*up
= NULL
;
182 struct in_addr stosend
;
186 memset(grp
, 0, size
);
187 pim_msg_addr_encode_ipv4_group((uint8_t *)&grp
->g
, sgs
->group
);
189 for (ALL_LIST_ELEMENTS(sgs
->sources
, node
, nnode
, source
)) {
190 /* number of joined/pruned sources */
196 if (source
->up
->sg
.src
.s_addr
== INADDR_ANY
) {
197 struct pim_instance
*pim
= source
->up
->channel_oil
->pim
;
198 struct pim_rpf
*rpf
= pim_rp_g(pim
, source
->up
->sg
.grp
);
199 bits
= PIM_ENCODE_SPARSE_BIT
| PIM_ENCODE_WC_BIT
200 | PIM_ENCODE_RPT_BIT
;
201 stosend
= rpf
->rpf_addr
.u
.prefix4
;
202 /* Only Send SGRpt in case of *,G Join */
206 bits
= PIM_ENCODE_SPARSE_BIT
;
207 stosend
= source
->up
->sg
.src
;
210 pim_msg_addr_encode_ipv4_source((uint8_t *)&grp
->s
[tgroups
],
216 struct pim_upstream
*child
;
218 for (ALL_LIST_ELEMENTS(up
->sources
, node
, nnode
, child
)) {
219 if (PIM_UPSTREAM_FLAG_TEST_SEND_SG_RPT_PRUNE(
221 pim_msg_addr_encode_ipv4_source(
222 (uint8_t *)&grp
->s
[tgroups
],
224 PIM_ENCODE_SPARSE_BIT
225 | PIM_ENCODE_RPT_BIT
);
227 PIM_UPSTREAM_FLAG_UNSET_SEND_SG_RPT_PRUNE(
234 grp
->joins
= htons(grp
->joins
);
235 grp
->prunes
= htons(grp
->prunes
);