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/*
* PIM for Quagga
* Copyright (C) 2022 Dell Technologies Ltd
*
* 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 "log.h"
#include "privs.h"
#include "if.h"
#include "prefix.h"
#include "vty.h"
#include "plist.h"
#include "sockopt.h"
#include "lib_errors.h"
#include "lib/network.h"
#include "pimd.h"
#include "pim_mroute.h"
#include "pim_oil.h"
#include "pim_str.h"
#include "pim_iface.h"
#include "pim_macro.h"
#include "pim_rp.h"
#include "pim_oil.h"
#include "pim_msg.h"
#include "pim_sock.h"
int pim_mroute_set(struct pim_instance *pim, int enable)
{
int err;
int opt, data;
socklen_t data_len = sizeof(data);
/*
* We need to create the VRF table for the pim mroute_socket
*/
if (pim->vrf->vrf_id != VRF_DEFAULT) {
frr_with_privs(&pimd_privs) {
data = pim->vrf->data.l.table_id;
err = setsockopt(pim->mroute_socket, PIM_IPPROTO,
MRT_TABLE, &data, data_len);
if (err) {
zlog_warn(
"%s %s: failure: setsockopt(fd=%d,PIM_IPPROTO, MRT_TABLE=%d): errno=%d: %s",
__FILE__, __func__, pim->mroute_socket,
data, errno, safe_strerror(errno));
return -1;
}
}
}
frr_with_privs(&pimd_privs) {
opt = enable ? MRT_INIT : MRT_DONE;
/*
* *BSD *cares* about what value we pass down
* here
*/
data = 1;
err = setsockopt(pim->mroute_socket, PIM_IPPROTO, opt, &data,
data_len);
if (err) {
zlog_warn(
"%s %s: failure: setsockopt(fd=%d,PIM_IPPROTO,%s=%d): errno=%d: %s",
__FILE__, __func__, pim->mroute_socket,
enable ? "MRT_INIT" : "MRT_DONE", data, errno,
safe_strerror(errno));
return -1;
}
}
#if defined(HAVE_IP_PKTINFO)
if (enable) {
/* Linux and Solaris IP_PKTINFO */
data = 1;
if (setsockopt(pim->mroute_socket, PIM_IPPROTO, IP_PKTINFO,
&data, data_len)) {
zlog_warn(
"Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
pim->mroute_socket, errno,
safe_strerror(errno));
}
}
#endif
setsockopt_so_recvbuf(pim->mroute_socket, 1024 * 1024 * 8);
if (set_nonblocking (pim->mroute_socket) < 0) {
zlog_warn(
"Could not set non blocking on socket fd=%d: errno=%d: %s",
pim->mroute_socket, errno,
safe_strerror(errno));
}
if (enable) {
#if defined linux
int upcalls = IGMPMSG_WRVIFWHOLE;
opt = MRT_PIM;
err = setsockopt(pim->mroute_socket, PIM_IPPROTO, opt, &upcalls,
sizeof(upcalls));
if (err) {
zlog_warn(
"Failure to register for VIFWHOLE and WRONGVIF upcalls %d %s",
errno, safe_strerror(errno));
return -1;
}
#else
zlog_warn(
"PIM-SM will not work properly on this platform, until the ability to receive the WRVIFWHOLE upcall");
#endif
}
return 0;
}
static const char *const igmpmsgtype2str[IGMPMSG_WRVIFWHOLE + 1] = {
"<unknown_upcall?>", "NOCACHE", "WRONGVIF", "WHOLEPKT", "WRVIFWHOLE"};
int pim_mroute_msg(struct pim_instance *pim, const char *buf,
size_t buf_size, ifindex_t ifindex)
{
struct interface *ifp;
const struct ip *ip_hdr;
const struct igmpmsg *msg;
if (buf_size < (int)sizeof(struct ip))
return 0;
ip_hdr = (const struct ip *)buf;
if (ip_hdr->ip_p == IPPROTO_IGMP) {
struct pim_interface *pim_ifp;
struct in_addr ifaddr;
struct gm_sock *igmp;
const struct prefix *connected_src;
/* We have the IP packet but we do not know which interface this
* packet was
* received on. Find the interface that is on the same subnet as
* the source
* of the IP packet.
*/
ifp = if_lookup_by_index(ifindex, pim->vrf->vrf_id);
if (!ifp || !ifp->info)
return 0;
connected_src = pim_if_connected_to_source(ifp, ip_hdr->ip_src);
if (!connected_src) {
if (PIM_DEBUG_IGMP_PACKETS) {
zlog_debug(
"Recv IGMP packet on interface: %s from a non-connected source: %pI4",
ifp->name, &ip_hdr->ip_src);
}
return 0;
}
pim_ifp = ifp->info;
ifaddr = connected_src->u.prefix4;
igmp = pim_igmp_sock_lookup_ifaddr(pim_ifp->gm_socket_list,
ifaddr);
if (PIM_DEBUG_IGMP_PACKETS) {
zlog_debug(
"%s(%s): igmp kernel upcall on %s(%p) for %pI4 -> %pI4",
__func__, pim->vrf->name, ifp->name, igmp,
&ip_hdr->ip_src, &ip_hdr->ip_dst);
}
if (igmp)
pim_igmp_packet(igmp, (char *)buf, buf_size);
else if (PIM_DEBUG_IGMP_PACKETS) {
zlog_debug(
"No IGMP socket on interface: %s with connected source: %pFX",
ifp->name, connected_src);
}
} else if (ip_hdr->ip_p) {
if (PIM_DEBUG_MROUTE_DETAIL) {
zlog_debug(
"%s: no kernel upcall proto=%d src: %pI4 dst: %pI4 msg_size=%ld",
__func__, ip_hdr->ip_p, &ip_hdr->ip_src,
&ip_hdr->ip_dst, (long int)buf_size);
}
} else {
msg = (const struct igmpmsg *)buf;
ifp = pim_if_find_by_vif_index(pim, msg->im_vif);
if (!ifp)
return 0;
if (PIM_DEBUG_MROUTE) {
zlog_debug(
"%s: pim kernel upcall %s type=%d ip_p=%d from fd=%d for (S,G)=(%pI4,%pI4) on %s vifi=%d size=%ld",
__func__, igmpmsgtype2str[msg->im_msgtype],
msg->im_msgtype, ip_hdr->ip_p,
pim->mroute_socket, &msg->im_src, &msg->im_dst,
ifp->name, msg->im_vif, (long int)buf_size);
}
switch (msg->im_msgtype) {
case IGMPMSG_WRONGVIF:
return pim_mroute_msg_wrongvif(pim->mroute_socket, ifp,
msg);
case IGMPMSG_NOCACHE:
return pim_mroute_msg_nocache(pim->mroute_socket, ifp,
msg);
case IGMPMSG_WHOLEPKT:
return pim_mroute_msg_wholepkt(pim->mroute_socket, ifp,
(const char *)msg);
case IGMPMSG_WRVIFWHOLE:
return pim_mroute_msg_wrvifwhole(
pim->mroute_socket, ifp, (const char *)msg);
default:
break;
}
}
return 0;
}
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