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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"
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;
}
/*
* J/P Message Format
*
* While the RFC clearly states that this is 32 bits wide, it
* is cheating. These fields:
* Encoded-Unicast format (6 bytes MIN)
* Encoded-Group format (8 bytes MIN)
* Encoded-Source format (8 bytes MIN)
* are *not* 32 bits wide.
*
* Nor does the RFC explicitly call out the size for:
* Reserved (1 byte)
* Num Groups (1 byte)
* Holdtime (2 bytes)
* Number of Joined Sources (2 bytes)
* Number of Pruned Sources (2 bytes)
*
* This leads to a missleading representation from casual
* reading and making assumptions. Be careful!
*
* 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 | Reserved | Checksum |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Upstream Neighbor Address (Encoded-Unicast format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Reserved | Num groups | Holdtime |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Multicast Group Address 1 (Encoded-Group format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Number of Joined Sources | Number of Pruned Sources |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Joined Source Address 1 (Encoded-Source format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | . |
* | . |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Joined Source Address n (Encoded-Source format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Pruned Source Address 1 (Encoded-Source format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | . |
* | . |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Pruned Source Address n (Encoded-Source format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Multicast Group Address m (Encoded-Group format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Number of Joined Sources | Number of Pruned Sources |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Joined Source Address 1 (Encoded-Source format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | . |
* | . |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Joined Source Address n (Encoded-Source format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Pruned Source Address 1 (Encoded-Source format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | . |
* | . |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Pruned Source Address n (Encoded-Source format) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
int
pim_msg_join_prune_encode (uint8_t *buf, size_t buf_size, int is_join,
struct pim_upstream *up,
struct in_addr upstream, int holdtime)
{
struct pim_jp *msg = (struct pim_jp *)buf;
struct in_addr stosend;
uint8_t bits;
assert(buf_size > sizeof (struct pim_jp));
if (!pim_msg_addr_encode_ipv4_ucast ((uint8_t *)&msg->addr, upstream)) {
char dst_str[INET_ADDRSTRLEN];
pim_inet4_dump("<dst?>", upstream, dst_str, sizeof(dst_str));
zlog_warn("%s: failure encoding destination address %s",
__PRETTY_FUNCTION__, dst_str);
return -3;
}
msg->reserved = 0;
msg->num_groups = 1;
msg->holdtime = htons(holdtime);
if (!pim_msg_addr_encode_ipv4_group ((uint8_t *)&msg->groups[0].g, up->sg.grp)) {
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<grp?>", up->sg.grp, group_str, sizeof(group_str));
zlog_warn("%s: failure encoding group address %s",
__PRETTY_FUNCTION__, group_str);
return -5;
}
/* number of joined/pruned sources */
msg->groups[0].joins = htons(is_join ? 1 : 0);
msg->groups[0].prunes = htons(is_join ? 0 : 1);
if (up->sg.src.s_addr == INADDR_ANY)
{
struct pim_rpf *rpf = pim_rp_g (up->sg.grp);
bits = PIM_ENCODE_SPARSE_BIT | PIM_ENCODE_WC_BIT | PIM_ENCODE_RPT_BIT;
stosend = rpf->rpf_addr.u.prefix4;
}
else
{
bits = PIM_ENCODE_SPARSE_BIT;
stosend = up->sg.src;
}
if (!pim_msg_addr_encode_ipv4_source ((uint8_t *)&msg->groups[0].s[0], stosend, bits)) {
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<src?>", up->sg.src, source_str, sizeof(source_str));
zlog_warn("%s: failure encoding source address %s",
__PRETTY_FUNCTION__, source_str);
return -7;
}
/*
* This is not implemented correctly at this point in time
* Make it stop.
*/
#if 0
if (up->sg.src.s_addr == INADDR_ANY)
{
struct pim_upstream *child;
struct listnode *up_node;
int send_prune = 0;
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))
{
send_prune = 1;
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))
{
send_prune = 1;
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))
{
send_prune = 1;
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);
if (send_prune)
{
pim_msg_curr = pim_msg_addr_encode_ipv4_source (pim_msg_curr, remain,
child->sg.src,
PIM_ENCODE_SPARSE_BIT | PIM_ENCODE_RPT_BIT);
remain = pim_msg_curr - pim_msg;
*prunes = htons(ntohs(*prunes) + 1);
send_prune = 0;
}
}
}
#endif
pim_msg_build_header (buf, sizeof (struct pim_jp), PIM_MSG_TYPE_JOIN_PRUNE);
return sizeof (struct pim_jp);
}
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