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/*
* 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
*/
#include <zebra.h>
#include "if.h"
#include "log.h"
#include "prefix.h"
#include "vty.h"
#include "plist.h"
#include "pimd.h"
#include "pim_vty.h"
#include "pim_pim.h"
#include "pim_msg.h"
#include "pim_util.h"
#include "pim_str.h"
#include "pim_iface.h"
#include "pim_rp.h"
#include "pim_rpf.h"
#include "pim_register.h"
#include "pim_jp_agg.h"
void pim_msg_build_header(uint8_t *pim_msg, size_t pim_msg_size, uint8_t pim_msg_type)
{
struct pim_msg_header *header = (struct pim_msg_header *)pim_msg;
/*
* Write header
*/
header->ver = PIM_PROTO_VERSION;
header->type = pim_msg_type;
header->reserved = 0;
header->checksum = 0;
/*
* The checksum for Registers is done only on the first 8 bytes of the packet,
* including the PIM header and the next 4 bytes, excluding the data packet portion
*/
if (pim_msg_type == PIM_MSG_TYPE_REGISTER)
header->checksum = in_cksum (pim_msg, PIM_MSG_REGISTER_LEN);
else
header->checksum = in_cksum (pim_msg, pim_msg_size);
}
uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf, struct in_addr addr)
{
buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
buf[1] = '\0'; /* native encoding */
memcpy(buf+2, &addr, sizeof(struct in_addr));
return buf + PIM_ENCODED_IPV4_UCAST_SIZE;
}
uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf, struct in_addr addr)
{
buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
buf[1] = '\0'; /* native encoding */
buf[2] = '\0'; /* reserved */
buf[3] = 32; /* mask len */
memcpy(buf+4, &addr, sizeof(struct in_addr));
return buf + PIM_ENCODED_IPV4_GROUP_SIZE;
}
uint8_t *
pim_msg_addr_encode_ipv4_source(uint8_t *buf,
struct in_addr addr, uint8_t bits)
{
buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
buf[1] = '\0'; /* native encoding */
buf[2] = bits;
buf[3] = 32; /* mask len */
memcpy(buf+4, &addr, sizeof(struct in_addr));
return buf + PIM_ENCODED_IPV4_SOURCE_SIZE;
}
/*
* For the given 'struct pim_jp_sources' list
* determine the size_t it would take up.
*/
size_t
pim_msg_get_jp_group_size (struct list *sources)
{
struct pim_jp_sources *js;
size_t size = 0;
size += sizeof (struct pim_encoded_group_ipv4);
size += 4; // Joined sources (2) + Pruned Sources (2)
size += sizeof (struct pim_encoded_source_ipv4) * sources->count;
js = listgetdata(listhead(sources));
if (js && js->up->sg.src.s_addr == INADDR_ANY)
{
struct pim_upstream *child, *up;
struct listnode *up_node;
up = js->up;
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug ("%s: Considering (%s) children for (S,G,rpt) prune",
__PRETTY_FUNCTION__, up->sg_str);
for (ALL_LIST_ELEMENTS_RO (up->sources, up_node, child))
{
if (child->sptbit == PIM_UPSTREAM_SPTBIT_TRUE)
{
if (!pim_rpf_is_same(&up->rpf, &child->rpf))
{
size += sizeof (struct pim_encoded_source_ipv4);
PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(child->flags);
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug ("%s: SPT Bit and RPF'(%s) != RPF'(S,G): Add Prune (%s,rpt) to compound message",
__PRETTY_FUNCTION__, up->sg_str, child->sg_str);
}
else
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug ("%s: SPT Bit and RPF'(%s) == RPF'(S,G): Not adding Prune for (%s,rpt)",
__PRETTY_FUNCTION__, up->sg_str, child->sg_str);
}
else if (pim_upstream_is_sg_rpt (child))
{
if (pim_upstream_empty_inherited_olist (child))
{
size += sizeof (struct pim_encoded_source_ipv4);
PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(child->flags);
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug ("%s: inherited_olist(%s,rpt) is NULL, Add Prune to compound message",
__PRETTY_FUNCTION__, child->sg_str);
}
else if (!pim_rpf_is_same (&up->rpf, &child->rpf))
{
size += sizeof (struct pim_encoded_source_ipv4);
PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(child->flags);
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug ("%s: RPF'(%s) != RPF'(%s,rpt), Add Prune to compound message",
__PRETTY_FUNCTION__, up->sg_str, child->sg_str);
}
else
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug ("%s: RPF'(%s) == RPF'(%s,rpt), Do not add Prune to compound message",
__PRETTY_FUNCTION__, up->sg_str, child->sg_str);
}
else
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug ("%s: SPT bit is not set for (%s)",
__PRETTY_FUNCTION__, child->sg_str);
}
}
return size;
}
size_t
pim_msg_build_jp_groups (struct pim_jp_groups *grp, struct pim_jp_agg_group *sgs, size_t size)
{
struct listnode *node, *nnode;
struct pim_jp_sources *source;
struct pim_upstream *up = NULL;
struct in_addr stosend;
uint8_t bits;
uint8_t tgroups = 0;
memset (grp, 0, size);
pim_msg_addr_encode_ipv4_group ((uint8_t *)&grp->g, sgs->group);
for (ALL_LIST_ELEMENTS(sgs->sources, node, nnode, source))
{
/* number of joined/pruned sources */
if (source->is_join)
grp->joins++;
else
grp->prunes++;
if (source->up->sg.src.s_addr == INADDR_ANY)
{
struct pim_rpf *rpf = pim_rp_g (source->up->sg.grp);
bits = PIM_ENCODE_SPARSE_BIT | PIM_ENCODE_WC_BIT | PIM_ENCODE_RPT_BIT;
stosend = rpf->rpf_addr.u.prefix4;
/* Only Send SGRpt in case of *,G Join */
if (source->is_join)
up = source->up;
}
else
{
bits = PIM_ENCODE_SPARSE_BIT;
stosend = source->up->sg.src;
}
pim_msg_addr_encode_ipv4_source ((uint8_t *)&grp->s[tgroups], stosend, bits);
tgroups++;
}
if (up)
{
struct pim_upstream *child;
for (ALL_LIST_ELEMENTS(up->sources, node, nnode, child))
{
if (PIM_UPSTREAM_FLAG_TEST_SEND_SG_RPT_PRUNE(child->flags))
{
pim_msg_addr_encode_ipv4_source ((uint8_t *)&grp->s[tgroups],
child->sg.src,
PIM_ENCODE_SPARSE_BIT | PIM_ENCODE_RPT_BIT);
tgroups++;
PIM_UPSTREAM_FLAG_UNSET_SEND_SG_RPT_PRUNE(child->flags);
grp->prunes++;
}
}
}
grp->joins = htons(grp->joins);
grp->prunes = htons(grp->prunes);
return size;
}
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