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pim_mroute.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PIM for Quagga
* Copyright (C) 2008 Everton da Silva Marques
*/
#include <zebra.h>
#include <netinet/icmp6.h>
#include <sys/ioctl.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_rpf.h"
#include "pim_mroute.h"
#include "pim_oil.h"
#include "pim_str.h"
#include "pim_time.h"
#include "pim_iface.h"
#include "pim_macro.h"
#include "pim_rp.h"
#include "pim_oil.h"
#include "pim_register.h"
#include "pim_ifchannel.h"
#include "pim_zlookup.h"
#include "pim_ssm.h"
#include "pim_sock.h"
#include "pim_vxlan.h"
#include "pim_msg.h"
static void mroute_read_on(struct pim_instance *pim);
static int pim_upstream_mroute_update(struct channel_oil *c_oil,
const char *name);
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 (enable && 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) {
if (err == ENOPROTOOPT)
zlog_err("%s Kernel is not compiled with CONFIG_IP_MROUTE_MULTIPLE_TABLES and vrf's will not work",
__func__);
else
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
#if PIM_IPV == 6
if (enable) {
/* Linux and Solaris IPV6_PKTINFO */
data = 1;
if (setsockopt(pim->mroute_socket, PIM_IPPROTO,
IPV6_RECVPKTINFO, &data, data_len)) {
zlog_warn(
"Could not set IPV6_RECVPKTINFO 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));
return -1;
}
if (enable) {
#if defined linux
int upcalls = GMMSG_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 gmmsgtype2str[GMMSG_WRVIFWHOLE + 1] = {
"<unknown_upcall?>", "NOCACHE", "WRONGVIF", "WHOLEPKT", "WRVIFWHOLE"};
int pim_mroute_msg_nocache(int fd, struct interface *ifp, const kernmsg *msg)
{
struct pim_interface *pim_ifp = ifp->info;
struct pim_upstream *up;
pim_sgaddr sg;
bool desync = false;
memset(&sg, 0, sizeof(sg));
sg.src = msg->msg_im_src;
sg.grp = msg->msg_im_dst;
if (!pim_ifp || !pim_ifp->pim_enable) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: %s on interface, dropping packet to %pSG",
ifp->name,
!pim_ifp ? "Multicast not enabled"
: "PIM not enabled",
&sg);
return 0;
}
if (!pim_is_grp_ssm(pim_ifp->pim, sg.grp)) {
/* for ASM, check that we have enough information (i.e. path
* to RP) to make a decision on what to do with this packet.
*
* for SSM, this is meaningless, everything is join-driven,
* and for NOCACHE we need to install an empty OIL MFC entry
* so the kernel doesn't keep nagging us.
*/
struct pim_rpf *rpg;
rpg = RP(pim_ifp->pim, msg->msg_im_dst);
if (!rpg) {
if (PIM_DEBUG_MROUTE)
zlog_debug("%s: no RPF for packet to %pSG",
ifp->name, &sg);
return 0;
}
if (pim_rpf_addr_is_inaddr_any(rpg)) {
if (PIM_DEBUG_MROUTE)
zlog_debug("%s: null RPF for packet to %pSG",
ifp->name, &sg);
return 0;
}
}
/*
* If we've received a multicast packet that isn't connected to
* us
*/
if (!pim_if_connected_to_source(ifp, msg->msg_im_src)) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: incoming packet to %pSG from non-connected source",
ifp->name, &sg);
return 0;
}
if (!(PIM_I_am_DR(pim_ifp))) {
/* unlike the other debug messages, this one is further in the
* "normal operation" category and thus under _DETAIL
*/
if (PIM_DEBUG_MROUTE_DETAIL)
zlog_debug(
"%s: not DR on interface, not forwarding traffic for %pSG",
ifp->name, &sg);
/*
* We are not the DR, but we are still receiving packets
* Let's blackhole those packets for the moment
* As that they will be coming up to the cpu
* and causing us to consider them.
*
* This *will* create a dangling channel_oil
* that I see no way to get rid of. Just noting
* this for future reference.
*/
up = pim_upstream_find_or_add(
&sg, ifp, PIM_UPSTREAM_FLAG_MASK_SRC_NOCACHE, __func__);
pim_upstream_mroute_add(up->channel_oil, __func__);
return 0;
}
up = pim_upstream_find_or_add(&sg, ifp, PIM_UPSTREAM_FLAG_MASK_FHR,
__func__);
if (up->channel_oil->installed) {
zlog_warn(
"%s: NOCACHE for %pSG, MFC entry disappeared - reinstalling",
ifp->name, &sg);
desync = true;
}
/*
* I moved this debug till after the actual add because
* I want to take advantage of the up->sg_str being filled in.
*/
if (PIM_DEBUG_MROUTE) {
zlog_debug("%s: Adding a Route %s for WHOLEPKT consumption",
__func__, up->sg_str);
}
PIM_UPSTREAM_FLAG_SET_SRC_STREAM(up->flags);
pim_upstream_keep_alive_timer_start(up, pim_ifp->pim->keep_alive_time);
up->channel_oil->cc.pktcnt++;
// resolve mfcc_parent prior to mroute_add in channel_add_oif
if (up->rpf.source_nexthop.interface &&
*oil_incoming_vif(up->channel_oil) >= MAXVIFS) {
pim_upstream_mroute_iif_update(up->channel_oil, __func__);
}
pim_register_join(up);
/* if we have receiver, inherit from parent */
pim_upstream_inherited_olist_decide(pim_ifp->pim, up);
/* we just got NOCACHE from the kernel, so... MFC is not in the
* kernel for some reason or another. Try installing again.
*/
if (desync)
pim_upstream_mroute_update(up->channel_oil, __func__);
return 0;
}
int pim_mroute_msg_wholepkt(int fd, struct interface *ifp, const char *buf,
size_t len)
{
struct pim_interface *pim_ifp;
pim_sgaddr sg;
struct pim_rpf *rpg;
const ipv_hdr *ip_hdr;
struct pim_upstream *up;
pim_ifp = ifp->info;
ip_hdr = (const ipv_hdr *)buf;
memset(&sg, 0, sizeof(sg));
sg.src = IPV_SRC(ip_hdr);
sg.grp = IPV_DST(ip_hdr);
up = pim_upstream_find(pim_ifp->pim, &sg);
if (!up) {
pim_sgaddr star = sg;
star.src = PIMADDR_ANY;
up = pim_upstream_find(pim_ifp->pim, &star);
if (up && PIM_UPSTREAM_FLAG_TEST_CAN_BE_LHR(up->flags)) {
up = pim_upstream_add(pim_ifp->pim, &sg, ifp,
PIM_UPSTREAM_FLAG_MASK_SRC_LHR,
__func__, NULL);
if (!up) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: Unable to create upstream information for %pSG",
__func__, &sg);
return 0;
}
pim_upstream_keep_alive_timer_start(
up, pim_ifp->pim->keep_alive_time);
pim_upstream_inherited_olist(pim_ifp->pim, up);
pim_upstream_update_join_desired(pim_ifp->pim, up);
if (PIM_DEBUG_MROUTE)
zlog_debug("%s: Creating %s upstream on LHR",
__func__, up->sg_str);
return 0;
}
if (PIM_DEBUG_MROUTE_DETAIL) {
zlog_debug(
"%s: Unable to find upstream channel WHOLEPKT%pSG",
__func__, &sg);
}
return 0;
}
if (!up->rpf.source_nexthop.interface) {
if (PIM_DEBUG_PIM_TRACE)
zlog_debug("%s: up %s RPF is not present", __func__,
up->sg_str);
return 0;
}
pim_ifp = up->rpf.source_nexthop.interface->info;
rpg = pim_ifp ? RP(pim_ifp->pim, sg.grp) : NULL;
if ((pim_rpf_addr_is_inaddr_any(rpg)) || (!pim_ifp) ||
(!(PIM_I_am_DR(pim_ifp)))) {
if (PIM_DEBUG_MROUTE) {
zlog_debug("%s: Failed Check send packet", __func__);
}
return 0;
}
/*
* If we've received a register suppress
*/
if (!up->t_rs_timer) {
if (pim_is_grp_ssm(pim_ifp->pim, sg.grp)) {
if (PIM_DEBUG_PIM_REG)
zlog_debug(
"%pSG register forward skipped as group is SSM",
&sg);
return 0;
}
if (!PIM_UPSTREAM_FLAG_TEST_FHR(up->flags)) {
if (PIM_DEBUG_PIM_REG)
zlog_debug(
"%s register forward skipped, not FHR",
up->sg_str);
return 0;
}
pim_register_send((uint8_t *)buf + sizeof(ipv_hdr),
len - sizeof(ipv_hdr),
pim_ifp->primary_address, rpg, 0, up);
}
return 0;
}
int pim_mroute_msg_wrongvif(int fd, struct interface *ifp, const kernmsg *msg)
{
struct pim_ifchannel *ch;
struct pim_interface *pim_ifp;
pim_sgaddr sg;
memset(&sg, 0, sizeof(sg));
sg.src = msg->msg_im_src;
sg.grp = msg->msg_im_dst;
/*
Send Assert(S,G) on iif as response to WRONGVIF kernel upcall.
RFC 4601 4.8.2. PIM-SSM-Only Routers
iif is the incoming interface of the packet.
if (iif is in inherited_olist(S,G)) {
send Assert(S,G) on iif
}
*/
if (!ifp) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: WRONGVIF (S,G)=%pSG could not find input interface for input_vif_index=%d",
__func__, &sg, msg->msg_im_vif);
return -1;
}
pim_ifp = ifp->info;
if (!pim_ifp) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: WRONGVIF (S,G)=%pSG multicast not enabled on interface %s",
__func__, &sg, ifp->name);
return -2;
}
ch = pim_ifchannel_find(ifp, &sg);
if (!ch) {
pim_sgaddr star_g = sg;
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: WRONGVIF (S,G)=%pSG could not find channel on interface %s",
__func__, &sg, ifp->name);
star_g.src = PIMADDR_ANY;
ch = pim_ifchannel_find(ifp, &star_g);
if (!ch) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: WRONGVIF (*,G)=%pSG could not find channel on interface %s",
__func__, &star_g, ifp->name);
return -3;
}
}
/*
RFC 4601: 4.6.1. (S,G) Assert Message State Machine
Transitions from NoInfo State
An (S,G) data packet arrives on interface I, AND
CouldAssert(S,G,I)==TRUE An (S,G) data packet arrived on an
downstream interface that is in our (S,G) outgoing interface
list. We optimistically assume that we will be the assert
winner for this (S,G), and so we transition to the "I am Assert
Winner" state and perform Actions A1 (below), which will
initiate the assert negotiation for (S,G).
*/
if (ch->ifassert_state != PIM_IFASSERT_NOINFO) {
if (PIM_DEBUG_MROUTE) {
zlog_debug(
"%s: WRONGVIF (S,G)=%s channel is not on Assert NoInfo state for interface %s",
__func__, ch->sg_str, ifp->name);
}
return -4;
}
if (!PIM_IF_FLAG_TEST_COULD_ASSERT(ch->flags)) {
if (PIM_DEBUG_MROUTE) {
zlog_debug(
"%s: WRONGVIF (S,G)=%s interface %s is not downstream for channel",
__func__, ch->sg_str, ifp->name);
}
return -5;
}
if (assert_action_a1(ch)) {
if (PIM_DEBUG_MROUTE) {
zlog_debug(
"%s: WRONGVIF (S,G)=%s assert_action_a1 failure on interface %s",
__func__, ch->sg_str, ifp->name);
}
return -6;
}
return 0;
}
int pim_mroute_msg_wrvifwhole(int fd, struct interface *ifp, const char *buf,
size_t len)
{
const ipv_hdr *ip_hdr = (const ipv_hdr *)buf;
struct pim_interface *pim_ifp;
struct pim_instance *pim;
struct pim_ifchannel *ch;
struct pim_upstream *up;
pim_sgaddr star_g;
pim_sgaddr sg;
pim_ifp = ifp->info;
memset(&sg, 0, sizeof(sg));
sg.src = IPV_SRC(ip_hdr);
sg.grp = IPV_DST(ip_hdr);
ch = pim_ifchannel_find(ifp, &sg);
if (ch) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"WRVIFWHOLE (S,G)=%s found ifchannel on interface %s",
ch->sg_str, ifp->name);
return -1;
}
star_g = sg;
star_g.src = PIMADDR_ANY;
pim = pim_ifp->pim;
/*
* If the incoming interface is the pimreg, then
* we know the callback is associated with a pim register
* packet and there is nothing to do here as that
* normal pim processing will see the packet and allow
* us to do the right thing.
*/
if (ifp == pim->regiface) {
return 0;
}
up = pim_upstream_find(pim_ifp->pim, &sg);
if (up) {
struct pim_upstream *parent;
struct pim_nexthop source;
struct pim_rpf *rpf = RP(pim_ifp->pim, sg.grp);
/* No RPF or No RPF interface or No mcast on RPF interface */
if (!rpf || !rpf->source_nexthop.interface ||
!rpf->source_nexthop.interface->info)
return 0;
/*
* If we have received a WRVIFWHOLE and are at this
* point, we could be receiving the packet on the *,G
* tree, let's check and if so we can safely drop
* it.
*/
parent = pim_upstream_find(pim_ifp->pim, &star_g);
if (parent && parent->rpf.source_nexthop.interface == ifp)
return 0;
pim_ifp = rpf->source_nexthop.interface->info;
memset(&source, 0, sizeof(source));
/*
* If we are the fhr that means we are getting a callback during
* the pimreg period, so I believe we can ignore this packet
*/
if (!PIM_UPSTREAM_FLAG_TEST_FHR(up->flags)) {
/*
* No if channel, but upstream we are at the RP.
*
* This could be a anycast RP too and we may
* not have received a register packet from
* the source here at all. So gracefully
* bow out of doing a nexthop lookup and
* setting the SPTBIT to true
*/
if (!(pim_addr_is_any(up->upstream_register)) &&
pim_nexthop_lookup(pim_ifp->pim, &source,
up->upstream_register, 0)) {
pim_register_stop_send(source.interface, &sg,
pim_ifp->primary_address,
up->upstream_register);
up->sptbit = PIM_UPSTREAM_SPTBIT_TRUE;
}
pim_upstream_inherited_olist(pim_ifp->pim, up);
if (!up->channel_oil->installed)
pim_upstream_mroute_add(up->channel_oil,
__func__);
} else {
if (I_am_RP(pim_ifp->pim, up->sg.grp)) {
if (pim_nexthop_lookup(pim_ifp->pim, &source,
up->upstream_register,
0))
pim_register_stop_send(
source.interface, &sg,
pim_ifp->primary_address,
up->upstream_register);
up->sptbit = PIM_UPSTREAM_SPTBIT_TRUE;
} else {
/*
* At this point pimd is connected to
* the source, it has a parent, we are not
* the RP and the SPTBIT should be set
* since we know *the* S,G is on the SPT.
* The first time this happens, let's cause
* an immediate join to go out so that
* the RP can trim this guy immediately
* if necessary, instead of waiting
* one join/prune send cycle
*/
if (up->sptbit != PIM_UPSTREAM_SPTBIT_TRUE &&
up->parent &&
up->rpf.source_nexthop.interface !=
up->parent->rpf.source_nexthop
.interface) {
up->sptbit = PIM_UPSTREAM_SPTBIT_TRUE;
pim_jp_agg_single_upstream_send(
&up->parent->rpf, up->parent,
true);
}
}
pim_upstream_keep_alive_timer_start(
up, pim_ifp->pim->keep_alive_time);
pim_upstream_inherited_olist(pim_ifp->pim, up);
pim_mroute_msg_wholepkt(fd, ifp, buf, len);
}
return 0;
}
pim_ifp = ifp->info;
if (pim_if_connected_to_source(ifp, sg.src)) {
up = pim_upstream_add(pim_ifp->pim, &sg, ifp,
PIM_UPSTREAM_FLAG_MASK_FHR, __func__,
NULL);
if (!up) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%pSG: WRONGVIF%s unable to create upstream on interface",
&sg, ifp->name);
return -2;
}
PIM_UPSTREAM_FLAG_SET_SRC_STREAM(up->flags);
pim_upstream_keep_alive_timer_start(
up, pim_ifp->pim->keep_alive_time);
up->channel_oil->cc.pktcnt++;
pim_register_join(up);
pim_upstream_inherited_olist(pim_ifp->pim, up);
if (!up->channel_oil->installed)
pim_upstream_mroute_add(up->channel_oil, __func__);
// Send the packet to the RP
pim_mroute_msg_wholepkt(fd, ifp, buf, len);
} else {
up = pim_upstream_add(pim_ifp->pim, &sg, ifp,
PIM_UPSTREAM_FLAG_MASK_SRC_NOCACHE,
__func__, NULL);
if (!up->channel_oil->installed)
pim_upstream_mroute_add(up->channel_oil, __func__);
}
return 0;
}
#if PIM_IPV == 4
static int process_igmp_packet(struct pim_instance *pim, const char *buf,
size_t buf_size, ifindex_t ifindex)
{
struct interface *ifp;
struct pim_interface *pim_ifp;
struct in_addr ifaddr;
struct gm_sock *igmp;
const struct prefix *connected_src;
const struct ip *ip_hdr = (const struct ip *)buf;
/* 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 && !pim_addr_is_any(ip_hdr->ip_src)) {
if (PIM_DEBUG_GM_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 ? connected_src->u.prefix4
: pim_ifp->primary_address;
igmp = pim_igmp_sock_lookup_ifaddr(pim_ifp->gm_socket_list, ifaddr);
if (PIM_DEBUG_GM_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_GM_PACKETS)
zlog_debug(
"No IGMP socket on interface: %s with connected source: %pI4",
ifp->name, &ifaddr);
return 0;
}
#endif
int pim_mroute_msg(struct pim_instance *pim, const char *buf, size_t buf_size,
ifindex_t ifindex)
{
struct interface *ifp;
const ipv_hdr *ip_hdr;
const kernmsg *msg;
if (buf_size < (int)sizeof(ipv_hdr))
return 0;
ip_hdr = (const ipv_hdr *)buf;
#if PIM_IPV == 4
if (ip_hdr->ip_p == IPPROTO_IGMP) {
process_igmp_packet(pim, buf, buf_size, ifindex);
} 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 {
#else
if ((ip_hdr->ip6_vfc & 0xf) == 0) {
#endif
msg = (const kernmsg *)buf;
ifp = pim_if_find_by_vif_index(pim, msg->msg_im_vif);
if (!ifp)
return 0;
if (PIM_DEBUG_MROUTE) {
#if PIM_IPV == 4
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__, gmmsgtype2str[msg->msg_im_msgtype],
msg->msg_im_msgtype, ip_hdr->ip_p,
pim->mroute_socket, &msg->msg_im_src,
&msg->msg_im_dst, ifp->name, msg->msg_im_vif,
(long int)buf_size);
#else
zlog_debug(
"%s: pim kernel upcall %s type=%d ip_p=%d from fd=%d for (S,G)=(%pI6,%pI6) on %s vifi=%d size=%ld",
__func__, gmmsgtype2str[msg->msg_im_msgtype],
msg->msg_im_msgtype, ip_hdr->ip6_nxt,
pim->mroute_socket, &msg->msg_im_src,
&msg->msg_im_dst, ifp->name, msg->msg_im_vif,
(long int)buf_size);
#endif
}
switch (msg->msg_im_msgtype) {
case GMMSG_WRONGVIF:
return pim_mroute_msg_wrongvif(pim->mroute_socket, ifp,
msg);
case GMMSG_NOCACHE:
return pim_mroute_msg_nocache(pim->mroute_socket, ifp,
msg);
case GMMSG_WHOLEPKT:
return pim_mroute_msg_wholepkt(pim->mroute_socket, ifp,
(const char *)msg,
buf_size);
case GMMSG_WRVIFWHOLE:
return pim_mroute_msg_wrvifwhole(pim->mroute_socket,
ifp, (const char *)msg,
buf_size);
default:
break;
}
}
return 0;
}
static void mroute_read(struct event *t)
{
struct pim_instance *pim;
static long long count;
char buf[10000];
int cont = 1;
int rd;
ifindex_t ifindex;
pim = EVENT_ARG(t);
while (cont) {
rd = pim_socket_recvfromto(pim->mroute_socket, (uint8_t *)buf,
sizeof(buf), NULL, NULL, NULL, NULL,
&ifindex);
if (rd <= 0) {
if (errno == EINTR)
continue;
if (errno == EWOULDBLOCK || errno == EAGAIN)
break;
zlog_warn(
"%s: failure reading rd=%d: fd=%d: errno=%d: %s",
__func__, rd, pim->mroute_socket, errno,
safe_strerror(errno));
goto done;
}
pim_mroute_msg(pim, buf, rd, ifindex);
count++;
if (count % router->packet_process == 0)
cont = 0;
}
/* Keep reading */
done:
mroute_read_on(pim);
return;
}
static void mroute_read_on(struct pim_instance *pim)
{
event_add_read(router->master, mroute_read, pim, pim->mroute_socket,
&pim->thread);
}
static void mroute_read_off(struct pim_instance *pim)
{
EVENT_OFF(pim->thread);
}
int pim_mroute_socket_enable(struct pim_instance *pim)
{
int fd;
frr_with_privs(&pimd_privs) {
#if PIM_IPV == 4
fd = socket(AF_INET, SOCK_RAW, IPPROTO_IGMP);
#else
fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
#endif
if (fd < 0) {
zlog_warn("Could not create mroute socket: errno=%d: %s",
errno,
safe_strerror(errno));
return -2;
}
#if PIM_IPV == 6
struct icmp6_filter filter[1];
int ret;
/* Unlike IPv4, this socket is not used for MLD, so just drop
* everything with an empty ICMP6 filter. Otherwise we get
* all kinds of garbage here, possibly even non-multicast
* related ICMPv6 traffic (e.g. ping)
*
* (mroute kernel upcall "packets" are injected directly on the
* socket, this sockopt -or any other- has no effect on them)
*/
ICMP6_FILTER_SETBLOCKALL(filter);
ret = setsockopt(fd, SOL_ICMPV6, ICMP6_FILTER, filter,
sizeof(filter));
if (ret)
zlog_err(
"(VRF %s) failed to set mroute control filter: %m",
pim->vrf->name);
#endif
#ifdef SO_BINDTODEVICE
if (pim->vrf->vrf_id != VRF_DEFAULT
&& setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
pim->vrf->name, strlen(pim->vrf->name))) {
zlog_warn("Could not setsockopt SO_BINDTODEVICE: %s",
safe_strerror(errno));
close(fd);
return -3;
}
#endif
}
pim->mroute_socket = fd;
if (pim_mroute_set(pim, 1)) {
zlog_warn(
"Could not enable mroute on socket fd=%d: errno=%d: %s",
fd, errno, safe_strerror(errno));
close(fd);
pim->mroute_socket = -1;
return -3;
}
pim->mroute_socket_creation = pim_time_monotonic_sec();
mroute_read_on(pim);
return 0;
}
int pim_mroute_socket_disable(struct pim_instance *pim)
{
if (pim_mroute_set(pim, 0)) {
zlog_warn(
"Could not disable mroute on socket fd=%d: errno=%d: %s",
pim->mroute_socket, errno, safe_strerror(errno));
return -2;
}
if (close(pim->mroute_socket)) {
zlog_warn("Failure closing mroute socket: fd=%d errno=%d: %s",
pim->mroute_socket, errno, safe_strerror(errno));
return -3;
}
mroute_read_off(pim);
pim->mroute_socket = -1;
return 0;
}
/*
For each network interface (e.g., physical or a virtual tunnel) that
would be used for multicast forwarding, a corresponding multicast
interface must be added to the kernel.
*/
int pim_mroute_add_vif(struct interface *ifp, pim_addr ifaddr,
unsigned char flags)
{
struct pim_interface *pim_ifp = ifp->info;
pim_vifctl vc;
int err;
if (PIM_DEBUG_MROUTE)
zlog_debug("%s: Add Vif %d (%s[%s])", __func__,
pim_ifp->mroute_vif_index, ifp->name,
pim_ifp->pim->vrf->name);
memset(&vc, 0, sizeof(vc));
vc.vc_vifi = pim_ifp->mroute_vif_index;
#if PIM_IPV == 4
#ifdef VIFF_USE_IFINDEX
vc.vc_lcl_ifindex = ifp->ifindex;
#else
if (ifaddr.s_addr == INADDR_ANY) {
zlog_warn(
"%s: unnumbered interfaces are not supported on this platform",
__func__);
return -1;
}
memcpy(&vc.vc_lcl_addr, &ifaddr, sizeof(vc.vc_lcl_addr));
#endif
#else
vc.vc_pifi = ifp->ifindex;
#endif
vc.vc_flags = flags;
vc.vc_threshold = PIM_MROUTE_MIN_TTL;
vc.vc_rate_limit = 0;
#if PIM_IPV == 4
#ifdef PIM_DVMRP_TUNNEL
if (vc.vc_flags & VIFF_TUNNEL) {
memcpy(&vc.vc_rmt_addr, &vif_remote_addr,
sizeof(vc.vc_rmt_addr));
}
#endif
#endif
err = setsockopt(pim_ifp->pim->mroute_socket, PIM_IPPROTO, MRT_ADD_VIF,
(void *)&vc, sizeof(vc));
if (err) {
zlog_warn(
"%s: failure: setsockopt(fd=%d,PIM_IPPROTO,MRT_ADD_VIF,vif_index=%d,ifaddr=%pPAs,flag=%d): errno=%d: %s",
__func__, pim_ifp->pim->mroute_socket, ifp->ifindex,
&ifaddr, flags, errno, safe_strerror(errno));
return -2;
}
return 0;
}
int pim_mroute_del_vif(struct interface *ifp)
{
struct pim_interface *pim_ifp = ifp->info;
pim_vifctl vc;
int err;
if (PIM_DEBUG_MROUTE)
zlog_debug("%s: Del Vif %d (%s[%s])", __func__,
pim_ifp->mroute_vif_index, ifp->name,
pim_ifp->pim->vrf->name);
memset(&vc, 0, sizeof(vc));
vc.vc_vifi = pim_ifp->mroute_vif_index;
err = setsockopt(pim_ifp->pim->mroute_socket, PIM_IPPROTO, MRT_DEL_VIF,
(void *)&vc, sizeof(vc));
if (err) {
zlog_warn(
"%s %s: failure: setsockopt(fd=%d,PIM_IPPROTO,MRT_DEL_VIF,vif_index=%d): errno=%d: %s",
__FILE__, __func__, pim_ifp->pim->mroute_socket,
pim_ifp->mroute_vif_index, errno, safe_strerror(errno));
return -2;
}