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964 lines
29 KiB
964 lines
29 KiB
From 6ea5d99456b14db5e82abc2461228bb37aa7556d Mon Sep 17 00:00:00 2001
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From: Amol Lad <amol.lad@4rf.com>
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Date: Wed, 17 Feb 2021 13:47:32 +1300
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Subject: [PATCH 01/14] nhrpd: Add support for forwarding multicast packets
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Forwarding multicast is a pre-requisite for allowing multicast based routing
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protocols such as OSPF to work with DMVPN
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This code relies on externally adding iptables rule. For example:
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iptables -A OUTPUT -d 224.0.0.0/24 -o gre1 -j NFLOG --nflog-group 224
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Signed-off-by: Reuben Dowle <reuben.dowle@4rf.com>
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---
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nhrpd/linux.c | 11 +-
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nhrpd/nhrp_interface.c | 2 +
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nhrpd/nhrp_multicast.c | 307 +++++++++++++++++++++++++++++++++++++++++
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nhrpd/nhrp_peer.c | 3 +-
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nhrpd/nhrp_vty.c | 63 +++++++++
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nhrpd/nhrpd.h | 16 +++
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nhrpd/os.h | 2 +-
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nhrpd/subdir.am | 1 +
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8 files changed, 398 insertions(+), 7 deletions(-)
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create mode 100755 nhrpd/nhrp_multicast.c
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--- a/nhrpd/linux.c
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+++ b/nhrpd/linux.c
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@@ -15,6 +15,7 @@
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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+#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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@@ -31,6 +32,11 @@
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#include "os.h"
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#include "netlink.h"
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+#ifndef HAVE_STRLCPY
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+size_t strlcpy(char *__restrict dest,
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+ const char *__restrict src, size_t destsize);
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+#endif
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+
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static int nhrp_socket_fd = -1;
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int os_socket(void)
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@@ -42,7 +48,7 @@ int os_socket(void)
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}
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int os_sendmsg(const uint8_t *buf, size_t len, int ifindex, const uint8_t *addr,
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- size_t addrlen)
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+ size_t addrlen, uint16_t protocol)
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{
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struct sockaddr_ll lladdr;
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struct iovec iov = {
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@@ -61,16 +67,16 @@ int os_sendmsg(const uint8_t *buf, size_
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memset(&lladdr, 0, sizeof(lladdr));
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lladdr.sll_family = AF_PACKET;
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- lladdr.sll_protocol = htons(ETH_P_NHRP);
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+ lladdr.sll_protocol = htons(protocol);
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lladdr.sll_ifindex = ifindex;
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lladdr.sll_halen = addrlen;
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memcpy(lladdr.sll_addr, addr, addrlen);
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- status = sendmsg(nhrp_socket_fd, &msg, 0);
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+ status = sendmsg(os_socket(), &msg, 0);
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if (status < 0)
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- return -1;
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+ return -errno;
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- return 0;
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+ return status;
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}
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int os_recvmsg(uint8_t *buf, size_t *len, int *ifindex, uint8_t *addr,
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@@ -111,7 +117,7 @@ static int linux_configure_arp(const cha
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{
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struct ifreq ifr;
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- strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1);
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+ strlcpy(ifr.ifr_name, iface, IFNAMSIZ);
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if (ioctl(nhrp_socket_fd, SIOCGIFFLAGS, &ifr))
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return -1;
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--- a/nhrpd/nhrp_interface.c
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+++ b/nhrpd/nhrp_interface.c
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@@ -42,6 +42,7 @@ static int nhrp_if_new_hook(struct inter
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struct nhrp_afi_data *ad = &nifp->afi[afi];
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ad->holdtime = NHRPD_DEFAULT_HOLDTIME;
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list_init(&ad->nhslist_head);
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+ list_init(&ad->mcastlist_head);
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}
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return 0;
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@@ -55,6 +56,7 @@ static int nhrp_if_delete_hook(struct in
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nhrp_cache_interface_del(ifp);
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nhrp_nhs_interface_del(ifp);
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+ nhrp_multicast_interface_del(ifp);
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nhrp_peer_interface_del(ifp);
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if (nifp->ipsec_profile)
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--- /dev/null
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+++ b/nhrpd/nhrp_multicast.c
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@@ -0,0 +1,309 @@
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+/* NHRP Multicast Support
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+ * Copyright (c) 2020-2021 4RF Limited
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+ *
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+ * This file is free software: you may copy, redistribute and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 2 of the License, or
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+ * (at your option) any later version.
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+ */
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+
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+#ifdef HAVE_CONFIG_H
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+#include "config.h"
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+#endif
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+
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+#include <fcntl.h>
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+#include <net/if.h>
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+#include <net/ethernet.h>
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+#include <netinet/if_ether.h>
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+#include <linux/netlink.h>
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+#include <linux/neighbour.h>
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+#include <linux/netfilter/nfnetlink_log.h>
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+#include <linux/if_packet.h>
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+#include <sys/types.h>
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+#include <sys/socket.h>
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+
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+#include "thread.h"
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+#include "nhrpd.h"
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+#include "netlink.h"
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+#include "znl.h"
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+#include "os.h"
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+
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+DEFINE_MTYPE_STATIC(NHRPD, NHRP_MULTICAST, "NHRP Multicast")
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+
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+int netlink_mcast_nflog_group;
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+static int netlink_mcast_log_fd = -1;
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+static struct thread *netlink_mcast_log_thread;
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+
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+struct mcast_ctx {
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+ struct interface *ifp;
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+ struct zbuf *pkt;
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+};
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+
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+static void nhrp_multicast_send(struct nhrp_peer *p, struct zbuf *zb)
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+{
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+ char buf[2][256];
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+ size_t addrlen;
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+ int ret;
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+
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+ addrlen = sockunion_get_addrlen(&p->vc->remote.nbma);
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+ ret = os_sendmsg(zb->head, zbuf_used(zb), p->ifp->ifindex,
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+ sockunion_get_addr(&p->vc->remote.nbma), addrlen,
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+ addrlen == 4 ? ETH_P_IP : ETH_P_IPV6);
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+
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+ debugf(NHRP_DEBUG_COMMON,
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+ "Multicast Packet: %s -> %s, ret = %d, size = %zu, addrlen = %zu",
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+ sockunion2str(&p->vc->local.nbma, buf[0], sizeof(buf[0])),
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+ sockunion2str(&p->vc->remote.nbma, buf[1], sizeof(buf[1])), ret,
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+ zbuf_used(zb), addrlen);
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+}
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+
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+static void nhrp_multicast_forward_nbma(union sockunion *nbma_addr,
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+ struct interface *ifp, struct zbuf *pkt)
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+{
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+ struct nhrp_peer *p = nhrp_peer_get(ifp, nbma_addr);
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+
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+ if (p && p->online) {
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+ /* Send packet */
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+ nhrp_multicast_send(p, pkt);
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+ }
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+ nhrp_peer_unref(p);
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+}
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+
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+static void nhrp_multicast_forward_cache(struct nhrp_cache *c, void *pctx)
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+{
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+ struct mcast_ctx *ctx = (struct mcast_ctx *)pctx;
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+
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+ if (c->cur.type == NHRP_CACHE_DYNAMIC && c->cur.peer)
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+ nhrp_multicast_forward_nbma(&c->cur.peer->vc->remote.nbma,
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+ ctx->ifp, ctx->pkt);
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+}
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+
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+static void nhrp_multicast_forward(struct nhrp_multicast *mcast, void *pctx)
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+{
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+ struct mcast_ctx *ctx = (struct mcast_ctx *)pctx;
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+ struct nhrp_interface *nifp = ctx->ifp->info;
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+
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+ if (!nifp->enabled)
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+ return;
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+
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+ /* dynamic */
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+ if (sockunion_family(&mcast->nbma_addr) == AF_UNSPEC) {
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+ nhrp_cache_foreach(ctx->ifp, nhrp_multicast_forward_cache,
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+ pctx);
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+ return;
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+ }
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+
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+ /* Fixed IP Address */
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+ nhrp_multicast_forward_nbma(&mcast->nbma_addr, ctx->ifp, ctx->pkt);
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+}
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+
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+static void netlink_mcast_log_handler(struct nlmsghdr *msg, struct zbuf *zb)
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+{
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+ struct nfgenmsg *nf;
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+ struct rtattr *rta;
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+ struct zbuf rtapl;
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+ uint32_t *out_ndx = NULL;
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+ afi_t afi;
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+ struct mcast_ctx ctx;
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+
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+ nf = znl_pull(zb, sizeof(*nf));
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+ if (!nf)
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+ return;
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+
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+ ctx.pkt = NULL;
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+ while ((rta = znl_rta_pull(zb, &rtapl)) != NULL) {
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+ switch (rta->rta_type) {
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+ case NFULA_IFINDEX_OUTDEV:
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+ out_ndx = znl_pull(&rtapl, sizeof(*out_ndx));
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+ break;
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+ case NFULA_PAYLOAD:
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+ ctx.pkt = &rtapl;
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+ break;
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+ /* NFULA_HWHDR exists and is supposed to contain source
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+ * hardware address. However, for ip_gre it seems to be
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+ * the nexthop destination address if the packet matches
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+ * route.
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+ */
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+ }
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+ }
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+
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+ if (!out_ndx || !ctx.pkt)
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+ return;
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+
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+ ctx.ifp = if_lookup_by_index(htonl(*out_ndx), VRF_DEFAULT);
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+ if (!ctx.ifp)
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+ return;
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+
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+ debugf(NHRP_DEBUG_COMMON, "Received multicast packet on %s len %zu\n",
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+ ctx.ifp->name, zbuf_used(ctx.pkt));
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+
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+ for (afi = 0; afi < AFI_MAX; afi++) {
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+ nhrp_multicast_foreach(ctx.ifp, afi, nhrp_multicast_forward,
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+ (void *)&ctx);
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+ }
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+}
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+
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+static int netlink_mcast_log_recv(struct thread *t)
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+{
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+ uint8_t buf[65535]; /* Max OSPF Packet size */
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+ int fd = THREAD_FD(t);
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+ struct zbuf payload, zb;
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+ struct nlmsghdr *n;
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+
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+ netlink_mcast_log_thread = NULL;
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+
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+ zbuf_init(&zb, buf, sizeof(buf), 0);
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+ while (zbuf_recv(&zb, fd) > 0) {
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+ while ((n = znl_nlmsg_pull(&zb, &payload)) != NULL) {
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+ debugf(NHRP_DEBUG_COMMON,
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+ "Netlink-mcast-log: Received msg_type %u, msg_flags %u",
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+ n->nlmsg_type, n->nlmsg_flags);
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+ switch (n->nlmsg_type) {
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+ case (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_PACKET:
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+ netlink_mcast_log_handler(n, &payload);
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+ break;
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+ }
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+ }
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+ }
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+
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+ thread_add_read(master, netlink_mcast_log_recv, 0, netlink_mcast_log_fd,
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+ &netlink_mcast_log_thread);
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+
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+ return 0;
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+}
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+
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+static void netlink_mcast_log_register(int fd, int group)
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+{
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+ struct nlmsghdr *n;
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+ struct nfgenmsg *nf;
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+ struct nfulnl_msg_config_cmd cmd;
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+ struct zbuf *zb = zbuf_alloc(512);
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+
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+ n = znl_nlmsg_push(zb, (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_CONFIG,
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+ NLM_F_REQUEST | NLM_F_ACK);
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+ nf = znl_push(zb, sizeof(*nf));
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+ *nf = (struct nfgenmsg){
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+ .nfgen_family = AF_UNSPEC,
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+ .version = NFNETLINK_V0,
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+ .res_id = htons(group),
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+ };
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+ cmd.command = NFULNL_CFG_CMD_BIND;
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+ znl_rta_push(zb, NFULA_CFG_CMD, &cmd, sizeof(cmd));
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+ znl_nlmsg_complete(zb, n);
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+
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+ zbuf_send(zb, fd);
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+ zbuf_free(zb);
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+}
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+
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+void netlink_mcast_set_nflog_group(int nlgroup)
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+{
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+ if (netlink_mcast_log_fd >= 0) {
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+ THREAD_OFF(netlink_mcast_log_thread);
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+ close(netlink_mcast_log_fd);
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+ netlink_mcast_log_fd = -1;
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+ debugf(NHRP_DEBUG_COMMON, "De-register nflog group");
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+ }
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+ netlink_mcast_nflog_group = nlgroup;
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+ if (nlgroup) {
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+ netlink_mcast_log_fd = znl_open(NETLINK_NETFILTER, 0);
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+ if (netlink_mcast_log_fd < 0)
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+ return;
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+
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+ netlink_mcast_log_register(netlink_mcast_log_fd, nlgroup);
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+ thread_add_read(master, netlink_mcast_log_recv, 0,
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+ netlink_mcast_log_fd,
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+ &netlink_mcast_log_thread);
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+ debugf(NHRP_DEBUG_COMMON, "Register nflog group: %d",
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+ netlink_mcast_nflog_group);
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+ }
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+}
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+
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+static int nhrp_multicast_free(struct interface *ifp,
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+ struct nhrp_multicast *mcast)
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+{
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+ list_del(&mcast->list_entry);
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+ XFREE(MTYPE_NHRP_MULTICAST, mcast);
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+ return 0;
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+}
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+
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+int nhrp_multicast_add(struct interface *ifp, afi_t afi,
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+ union sockunion *nbma_addr)
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+{
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+ struct nhrp_interface *nifp = ifp->info;
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+ struct nhrp_multicast *mcast;
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+ char buf[SU_ADDRSTRLEN];
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+
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+ list_for_each_entry(mcast, &nifp->afi[afi].mcastlist_head, list_entry)
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+ {
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+ if (sockunion_same(&mcast->nbma_addr, nbma_addr))
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+ return NHRP_ERR_ENTRY_EXISTS;
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+ }
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+
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+ mcast = XMALLOC(MTYPE_NHRP_MULTICAST, sizeof(struct nhrp_multicast));
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+
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+ *mcast = (struct nhrp_multicast){
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+ .afi = afi, .ifp = ifp, .nbma_addr = *nbma_addr,
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+ };
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+ list_add_tail(&mcast->list_entry, &nifp->afi[afi].mcastlist_head);
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+
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+ sockunion2str(nbma_addr, buf, sizeof(buf));
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+ debugf(NHRP_DEBUG_COMMON, "Adding multicast entry (%s)", buf);
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+
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+ return NHRP_OK;
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+}
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+
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+int nhrp_multicast_del(struct interface *ifp, afi_t afi,
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+ union sockunion *nbma_addr)
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+{
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+ struct nhrp_interface *nifp = ifp->info;
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+ struct nhrp_multicast *mcast, *tmp;
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+ char buf[SU_ADDRSTRLEN];
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+
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+ list_for_each_entry_safe(mcast, tmp, &nifp->afi[afi].mcastlist_head,
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+ list_entry)
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+ {
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+ if (!sockunion_same(&mcast->nbma_addr, nbma_addr))
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+ continue;
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+
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+ sockunion2str(nbma_addr, buf, sizeof(buf));
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+ debugf(NHRP_DEBUG_COMMON, "Deleting multicast entry (%s)", buf);
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+
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+ nhrp_multicast_free(ifp, mcast);
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+
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+ return NHRP_OK;
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+ }
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+
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+ return NHRP_ERR_ENTRY_NOT_FOUND;
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+}
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+
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+void nhrp_multicast_interface_del(struct interface *ifp)
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+{
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+ struct nhrp_interface *nifp = ifp->info;
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+ struct nhrp_multicast *mcast, *tmp;
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+ afi_t afi;
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+
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+ for (afi = 0; afi < AFI_MAX; afi++) {
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+ debugf(NHRP_DEBUG_COMMON,
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+ "Cleaning up multicast entries (%d)",
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+ !list_empty(&nifp->afi[afi].mcastlist_head));
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+
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+ list_for_each_entry_safe(
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+ mcast, tmp, &nifp->afi[afi].mcastlist_head, list_entry)
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+ {
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+ nhrp_multicast_free(ifp, mcast);
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+ }
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+ }
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+}
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+
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+void nhrp_multicast_foreach(struct interface *ifp, afi_t afi,
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+ void (*cb)(struct nhrp_multicast *, void *),
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+ void *ctx)
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+{
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+ struct nhrp_interface *nifp = ifp->info;
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+ struct nhrp_multicast *mcast;
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+
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+ list_for_each_entry(mcast, &nifp->afi[afi].mcastlist_head, list_entry)
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+ {
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+ cb(mcast, ctx);
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+ }
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+}
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--- a/nhrpd/nhrp_peer.c
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+++ b/nhrpd/nhrp_peer.c
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@@ -337,7 +337,7 @@ void nhrp_peer_send(struct nhrp_peer *p,
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|
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os_sendmsg(zb->head, zbuf_used(zb), p->ifp->ifindex,
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sockunion_get_addr(&p->vc->remote.nbma),
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- sockunion_get_addrlen(&p->vc->remote.nbma));
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+ sockunion_get_addrlen(&p->vc->remote.nbma), ETH_P_NHRP);
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zbuf_reset(zb);
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}
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|
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--- a/nhrpd/nhrp_vty.c
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+++ b/nhrpd/nhrp_vty.c
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@@ -187,6 +187,9 @@ static int nhrp_config_write(struct vty
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if (netlink_nflog_group) {
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vty_out(vty, "nhrp nflog-group %d\n", netlink_nflog_group);
|
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}
|
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+ if (netlink_mcast_nflog_group)
|
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+ vty_out(vty, "nhrp multicast-nflog-group %d\n",
|
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+ netlink_mcast_nflog_group);
|
|
|
|
return 0;
|
|
}
|
|
@@ -257,6 +260,31 @@ DEFUN(no_nhrp_nflog_group, no_nhrp_nflog
|
|
return CMD_SUCCESS;
|
|
}
|
|
|
|
+DEFUN(nhrp_multicast_nflog_group, nhrp_multicast_nflog_group_cmd,
|
|
+ "nhrp multicast-nflog-group (1-65535)",
|
|
+ NHRP_STR
|
|
+ "Specify NFLOG group number for Multicast Packets\n"
|
|
+ "NFLOG group number\n")
|
|
+{
|
|
+ uint32_t nfgroup;
|
|
+
|
|
+ nfgroup = strtoul(argv[2]->arg, NULL, 10);
|
|
+ netlink_mcast_set_nflog_group(nfgroup);
|
|
+
|
|
+ return CMD_SUCCESS;
|
|
+}
|
|
+
|
|
+DEFUN(no_nhrp_multicast_nflog_group, no_nhrp_multicast_nflog_group_cmd,
|
|
+ "no nhrp multicast-nflog-group [(1-65535)]",
|
|
+ NO_STR
|
|
+ NHRP_STR
|
|
+ "Specify NFLOG group number\n"
|
|
+ "NFLOG group number\n")
|
|
+{
|
|
+ netlink_mcast_set_nflog_group(0);
|
|
+ return CMD_SUCCESS;
|
|
+}
|
|
+
|
|
DEFUN(tunnel_protection, tunnel_protection_cmd,
|
|
"tunnel protection vici profile PROFILE [fallback-profile FALLBACK]",
|
|
"NHRP/GRE integration\n"
|
|
@@ -569,6 +597,53 @@ DEFUN(if_no_nhrp_map, if_no_nhrp_map_cmd
|
|
return CMD_SUCCESS;
|
|
}
|
|
|
|
+DEFUN(if_nhrp_map_multicast, if_nhrp_map_multicast_cmd,
|
|
+ AFI_CMD " nhrp map multicast <A.B.C.D|X:X::X:X|dynamic>",
|
|
+ AFI_STR
|
|
+ NHRP_STR
|
|
+ "Multicast NBMA Configuration\n"
|
|
+ "Use this NBMA mapping for multicasts\n"
|
|
+ "IPv4 NBMA address\n"
|
|
+ "IPv6 NBMA address\n"
|
|
+ "Dynamically learn destinations from client registrations on hub\n")
|
|
+{
|
|
+ VTY_DECLVAR_CONTEXT(interface, ifp);
|
|
+ afi_t afi = cmd_to_afi(argv[0]);
|
|
+ union sockunion nbma_addr;
|
|
+ int ret;
|
|
+
|
|
+ if (str2sockunion(argv[4]->arg, &nbma_addr) < 0)
|
|
+ sockunion_family(&nbma_addr) = AF_UNSPEC;
|
|
+
|
|
+ ret = nhrp_multicast_add(ifp, afi, &nbma_addr);
|
|
+
|
|
+ return nhrp_vty_return(vty, ret);
|
|
+}
|
|
+
|
|
+DEFUN(if_no_nhrp_map_multicast, if_no_nhrp_map_multicast_cmd,
|
|
+ "no " AFI_CMD " nhrp map multicast <A.B.C.D|X:X::X:X|dynamic>",
|
|
+ NO_STR
|
|
+ AFI_STR
|
|
+ NHRP_STR
|
|
+ "Multicast NBMA Configuration\n"
|
|
+ "Use this NBMA mapping for multicasts\n"
|
|
+ "IPv4 NBMA address\n"
|
|
+ "IPv6 NBMA address\n"
|
|
+ "Dynamically learn destinations from client registrations on hub\n")
|
|
+{
|
|
+ VTY_DECLVAR_CONTEXT(interface, ifp);
|
|
+ afi_t afi = cmd_to_afi(argv[1]);
|
|
+ union sockunion nbma_addr;
|
|
+ int ret;
|
|
+
|
|
+ if (str2sockunion(argv[5]->arg, &nbma_addr) < 0)
|
|
+ sockunion_family(&nbma_addr) = AF_UNSPEC;
|
|
+
|
|
+ ret = nhrp_multicast_del(ifp, afi, &nbma_addr);
|
|
+
|
|
+ return nhrp_vty_return(vty, ret);
|
|
+}
|
|
+
|
|
DEFUN(if_nhrp_nhs, if_nhrp_nhs_cmd,
|
|
AFI_CMD " nhrp nhs <A.B.C.D|X:X::X:X|dynamic> nbma <A.B.C.D|FQDN>",
|
|
AFI_STR
|
|
@@ -644,8 +719,8 @@ static void show_ip_nhrp_cache(struct nh
|
|
|
|
sockunion2str(&c->remote_addr, buf[0], sizeof(buf[0]));
|
|
if (c->cur.peer)
|
|
- sockunion2str(&c->cur.peer->vc->remote.nbma,
|
|
- buf[1], sizeof(buf[1]));
|
|
+ sockunion2str(&c->cur.peer->vc->remote.nbma, buf[1],
|
|
+ sizeof(buf[1]));
|
|
else
|
|
snprintf(buf[1], sizeof(buf[1]), "-");
|
|
|
|
@@ -704,8 +779,8 @@ static void show_ip_nhrp_nhs(struct nhrp
|
|
ctx->count++;
|
|
|
|
if (reg && reg->peer)
|
|
- sockunion2str(®->peer->vc->remote.nbma,
|
|
- buf[0], sizeof(buf[0]));
|
|
+ sockunion2str(®->peer->vc->remote.nbma, buf[0],
|
|
+ sizeof(buf[0]));
|
|
else
|
|
snprintf(buf[0], sizeof(buf[0]), "-");
|
|
sockunion2str(reg ? ®->proto_addr : &n->proto_addr, buf[1],
|
|
@@ -1018,7 +1093,8 @@ struct write_map_ctx {
|
|
const char *aficmd;
|
|
};
|
|
|
|
-static void interface_config_write_nhrp_map(struct nhrp_cache_config *c, void *data)
|
|
+static void interface_config_write_nhrp_map(struct nhrp_cache_config *c,
|
|
+ void *data)
|
|
{
|
|
struct write_map_ctx *ctx = data;
|
|
struct vty *vty = ctx->vty;
|
|
@@ -1030,7 +1106,8 @@ static void interface_config_write_nhrp_
|
|
vty_out(vty, " %s nhrp map %s %s\n", ctx->aficmd,
|
|
sockunion2str(&c->remote_addr, buf[0], sizeof(buf[0])),
|
|
c->type == NHRP_CACHE_LOCAL
|
|
- ? "local" : sockunion2str(&c->nbma, buf[1], sizeof(buf[1])));
|
|
+ ? "local"
|
|
+ : sockunion2str(&c->nbma, buf[1], sizeof(buf[1])));
|
|
}
|
|
|
|
static int interface_config_write(struct vty *vty)
|
|
@@ -1040,6 +1117,7 @@ static int interface_config_write(struct
|
|
struct interface *ifp;
|
|
struct nhrp_interface *nifp;
|
|
struct nhrp_nhs *nhs;
|
|
+ struct nhrp_multicast *mcast;
|
|
const char *aficmd;
|
|
afi_t afi;
|
|
char buf[SU_ADDRSTRLEN];
|
|
@@ -1093,8 +1171,8 @@ static int interface_config_write(struct
|
|
.family = afi2family(afi),
|
|
.aficmd = aficmd,
|
|
};
|
|
- nhrp_cache_config_foreach(ifp, interface_config_write_nhrp_map,
|
|
- &mapctx);
|
|
+ nhrp_cache_config_foreach(
|
|
+ ifp, interface_config_write_nhrp_map, &mapctx);
|
|
|
|
list_for_each_entry(nhs, &ad->nhslist_head,
|
|
nhslist_entry)
|
|
@@ -1109,6 +1187,19 @@ static int interface_config_write(struct
|
|
sizeof(buf)),
|
|
nhs->nbma_fqdn);
|
|
}
|
|
+
|
|
+ list_for_each_entry(mcast, &ad->mcastlist_head,
|
|
+ list_entry)
|
|
+ {
|
|
+ vty_out(vty, " %s nhrp map multicast %s\n",
|
|
+ aficmd,
|
|
+ sockunion_family(&mcast->nbma_addr)
|
|
+ == AF_UNSPEC
|
|
+ ? "dynamic"
|
|
+ : sockunion2str(
|
|
+ &mcast->nbma_addr,
|
|
+ buf, sizeof(buf)));
|
|
+ }
|
|
}
|
|
|
|
vty_endframe(vty, "!\n");
|
|
@@ -1142,6 +1233,8 @@ void nhrp_config_init(void)
|
|
install_element(CONFIG_NODE, &no_nhrp_event_socket_cmd);
|
|
install_element(CONFIG_NODE, &nhrp_nflog_group_cmd);
|
|
install_element(CONFIG_NODE, &no_nhrp_nflog_group_cmd);
|
|
+ install_element(CONFIG_NODE, &nhrp_multicast_nflog_group_cmd);
|
|
+ install_element(CONFIG_NODE, &no_nhrp_multicast_nflog_group_cmd);
|
|
|
|
/* interface specific commands */
|
|
install_node(&nhrp_interface_node);
|
|
@@ -1163,6 +1256,8 @@ void nhrp_config_init(void)
|
|
install_element(INTERFACE_NODE, &if_no_nhrp_reg_flags_cmd);
|
|
install_element(INTERFACE_NODE, &if_nhrp_map_cmd);
|
|
install_element(INTERFACE_NODE, &if_no_nhrp_map_cmd);
|
|
+ install_element(INTERFACE_NODE, &if_nhrp_map_multicast_cmd);
|
|
+ install_element(INTERFACE_NODE, &if_no_nhrp_map_multicast_cmd);
|
|
install_element(INTERFACE_NODE, &if_nhrp_nhs_cmd);
|
|
install_element(INTERFACE_NODE, &if_no_nhrp_nhs_cmd);
|
|
}
|
|
--- a/nhrpd/nhrpd.h
|
|
+++ b/nhrpd/nhrpd.h
|
|
@@ -259,6 +259,13 @@ struct nhrp_nhs {
|
|
struct list_head reglist_head;
|
|
};
|
|
|
|
+struct nhrp_multicast {
|
|
+ struct interface *ifp;
|
|
+ struct list_head list_entry;
|
|
+ afi_t afi;
|
|
+ union sockunion nbma_addr; /* IP-address */
|
|
+};
|
|
+
|
|
struct nhrp_registration {
|
|
struct list_head reglist_entry;
|
|
struct thread *t_register;
|
|
@@ -304,6 +311,7 @@ struct nhrp_interface {
|
|
unsigned short mtu;
|
|
unsigned int holdtime;
|
|
struct list_head nhslist_head;
|
|
+ struct list_head mcastlist_head;
|
|
} afi[AFI_MAX];
|
|
};
|
|
|
|
@@ -345,6 +353,16 @@ void nhrp_nhs_foreach(struct interface *
|
|
void *ctx);
|
|
void nhrp_nhs_interface_del(struct interface *ifp);
|
|
|
|
+int nhrp_multicast_add(struct interface *ifp, afi_t afi,
|
|
+ union sockunion *nbma_addr);
|
|
+int nhrp_multicast_del(struct interface *ifp, afi_t afi,
|
|
+ union sockunion *nbma_addr);
|
|
+void nhrp_multicast_interface_del(struct interface *ifp);
|
|
+void nhrp_multicast_foreach(struct interface *ifp, afi_t afi,
|
|
+ void (*cb)(struct nhrp_multicast *, void *),
|
|
+ void *ctx);
|
|
+void netlink_mcast_set_nflog_group(int nlgroup);
|
|
+
|
|
void nhrp_route_update_nhrp(const struct prefix *p, struct interface *ifp);
|
|
void nhrp_route_announce(int add, enum nhrp_cache_type type,
|
|
const struct prefix *p, struct interface *ifp,
|
|
--- a/nhrpd/os.h
|
|
+++ b/nhrpd/os.h
|
|
@@ -1,7 +1,7 @@
|
|
|
|
int os_socket(void);
|
|
int os_sendmsg(const uint8_t *buf, size_t len, int ifindex, const uint8_t *addr,
|
|
- size_t addrlen);
|
|
+ size_t addrlen, uint16_t protocol);
|
|
int os_recvmsg(uint8_t *buf, size_t *len, int *ifindex, uint8_t *addr,
|
|
size_t *addrlen);
|
|
int os_configure_dmvpn(unsigned int ifindex, const char *ifname, int af);
|
|
--- a/nhrpd/subdir.am
|
|
+++ b/nhrpd/subdir.am
|
|
@@ -21,6 +21,7 @@ nhrpd_nhrpd_SOURCES = \
|
|
nhrpd/nhrp_nhs.c \
|
|
nhrpd/nhrp_packet.c \
|
|
nhrpd/nhrp_peer.c \
|
|
+ nhrpd/nhrp_multicast.c \
|
|
nhrpd/nhrp_route.c \
|
|
nhrpd/nhrp_shortcut.c \
|
|
nhrpd/nhrp_vc.c \
|
|
--- a/ospfd/ospf_interface.c
|
|
+++ b/ospfd/ospf_interface.c
|
|
@@ -534,6 +534,8 @@ static struct ospf_if_params *ospf_new_i
|
|
oip->network_lsa_seqnum = htonl(OSPF_INITIAL_SEQUENCE_NUMBER);
|
|
oip->is_v_wait_set = false;
|
|
|
|
+ oip->ptp_dmvpn = 0;
|
|
+
|
|
return oip;
|
|
}
|
|
|
|
--- a/ospfd/ospf_interface.h
|
|
+++ b/ospfd/ospf_interface.h
|
|
@@ -105,6 +105,9 @@ struct ospf_if_params {
|
|
|
|
/* BFD configuration */
|
|
struct bfd_info *bfd_info;
|
|
+
|
|
+ /* point-to-point DMVPN configuration */
|
|
+ uint8_t ptp_dmvpn;
|
|
};
|
|
|
|
enum { MEMBER_ALLROUTERS = 0,
|
|
@@ -167,6 +170,9 @@ struct ospf_interface {
|
|
/* OSPF Network Type. */
|
|
uint8_t type;
|
|
|
|
+ /* point-to-point DMVPN configuration */
|
|
+ uint8_t ptp_dmvpn;
|
|
+
|
|
/* State of Interface State Machine. */
|
|
uint8_t state;
|
|
|
|
--- a/ospfd/ospf_lsa.c
|
|
+++ b/ospfd/ospf_lsa.c
|
|
@@ -469,6 +469,12 @@ static char link_info_set(struct stream
|
|
}
|
|
|
|
/* Describe Point-to-Point link (Section 12.4.1.1). */
|
|
+
|
|
+/* Note: If the interface is configured as point-to-point dmvpn then the other
|
|
+ * end of link is dmvpn hub with point-to-multipoint ospf network type. The
|
|
+ * hub then expects this router to populate the stub network and also Link Data
|
|
+ * Field set to IP Address and not MIB-II ifIndex
|
|
+ */
|
|
static int lsa_link_ptop_set(struct stream **s, struct ospf_interface *oi)
|
|
{
|
|
int links = 0;
|
|
@@ -482,7 +488,8 @@ static int lsa_link_ptop_set(struct stre
|
|
if ((nbr = ospf_nbr_lookup_ptop(oi)))
|
|
if (nbr->state == NSM_Full) {
|
|
if (CHECK_FLAG(oi->connected->flags,
|
|
- ZEBRA_IFA_UNNUMBERED)) {
|
|
+ ZEBRA_IFA_UNNUMBERED)
|
|
+ && !oi->ptp_dmvpn) {
|
|
/* For unnumbered point-to-point networks, the
|
|
Link Data field
|
|
should specify the interface's MIB-II ifIndex
|
|
@@ -500,7 +507,8 @@ static int lsa_link_ptop_set(struct stre
|
|
}
|
|
|
|
/* no need for a stub link for unnumbered interfaces */
|
|
- if (!CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED)) {
|
|
+ if (oi->ptp_dmvpn
|
|
+ || !CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED)) {
|
|
/* Regardless of the state of the neighboring router, we must
|
|
add a Type 3 link (stub network).
|
|
N.B. Options 1 & 2 share basically the same logic. */
|
|
--- a/ospfd/ospf_vty.c
|
|
+++ b/ospfd/ospf_vty.c
|
|
@@ -7562,20 +7562,21 @@ DEFUN_HIDDEN (no_ospf_hello_interval,
|
|
return no_ip_ospf_hello_interval(self, vty, argc, argv);
|
|
}
|
|
|
|
-DEFUN (ip_ospf_network,
|
|
- ip_ospf_network_cmd,
|
|
- "ip ospf network <broadcast|non-broadcast|point-to-multipoint|point-to-point>",
|
|
- "IP Information\n"
|
|
- "OSPF interface commands\n"
|
|
- "Network type\n"
|
|
- "Specify OSPF broadcast multi-access network\n"
|
|
- "Specify OSPF NBMA network\n"
|
|
- "Specify OSPF point-to-multipoint network\n"
|
|
- "Specify OSPF point-to-point network\n")
|
|
+DEFUN(ip_ospf_network, ip_ospf_network_cmd,
|
|
+ "ip ospf network <broadcast|non-broadcast|point-to-multipoint|point-to-point [dmvpn]>",
|
|
+ "IP Information\n"
|
|
+ "OSPF interface commands\n"
|
|
+ "Network type\n"
|
|
+ "Specify OSPF broadcast multi-access network\n"
|
|
+ "Specify OSPF NBMA network\n"
|
|
+ "Specify OSPF point-to-multipoint network\n"
|
|
+ "Specify OSPF point-to-point network\n"
|
|
+ "Specify OSPF point-to-point DMVPN network\n")
|
|
{
|
|
VTY_DECLVAR_CONTEXT(interface, ifp);
|
|
int idx = 0;
|
|
int old_type = IF_DEF_PARAMS(ifp)->type;
|
|
+ uint8_t old_ptp_dmvpn = IF_DEF_PARAMS(ifp)->ptp_dmvpn;
|
|
struct route_node *rn;
|
|
|
|
if (old_type == OSPF_IFTYPE_LOOPBACK) {
|
|
@@ -7584,16 +7585,22 @@ DEFUN (ip_ospf_network,
|
|
return CMD_WARNING_CONFIG_FAILED;
|
|
}
|
|
|
|
+ IF_DEF_PARAMS(ifp)->ptp_dmvpn = 0;
|
|
+
|
|
if (argv_find(argv, argc, "broadcast", &idx))
|
|
IF_DEF_PARAMS(ifp)->type = OSPF_IFTYPE_BROADCAST;
|
|
else if (argv_find(argv, argc, "non-broadcast", &idx))
|
|
IF_DEF_PARAMS(ifp)->type = OSPF_IFTYPE_NBMA;
|
|
else if (argv_find(argv, argc, "point-to-multipoint", &idx))
|
|
IF_DEF_PARAMS(ifp)->type = OSPF_IFTYPE_POINTOMULTIPOINT;
|
|
- else if (argv_find(argv, argc, "point-to-point", &idx))
|
|
+ else if (argv_find(argv, argc, "point-to-point", &idx)) {
|
|
IF_DEF_PARAMS(ifp)->type = OSPF_IFTYPE_POINTOPOINT;
|
|
+ if (argv_find(argv, argc, "dmvpn", &idx))
|
|
+ IF_DEF_PARAMS(ifp)->ptp_dmvpn = 1;
|
|
+ }
|
|
|
|
- if (IF_DEF_PARAMS(ifp)->type == old_type)
|
|
+ if (IF_DEF_PARAMS(ifp)->type == old_type
|
|
+ && IF_DEF_PARAMS(ifp)->ptp_dmvpn == old_ptp_dmvpn)
|
|
return CMD_SUCCESS;
|
|
|
|
SET_IF_PARAM(IF_DEF_PARAMS(ifp), type);
|
|
@@ -7605,6 +7612,7 @@ DEFUN (ip_ospf_network,
|
|
continue;
|
|
|
|
oi->type = IF_DEF_PARAMS(ifp)->type;
|
|
+ oi->ptp_dmvpn = IF_DEF_PARAMS(ifp)->ptp_dmvpn;
|
|
|
|
if (oi->state > ISM_Down) {
|
|
OSPF_ISM_EVENT_EXECUTE(oi, ISM_InterfaceDown);
|
|
@@ -7645,6 +7653,7 @@ DEFUN (no_ip_ospf_network,
|
|
struct route_node *rn;
|
|
|
|
IF_DEF_PARAMS(ifp)->type = ospf_default_iftype(ifp);
|
|
+ IF_DEF_PARAMS(ifp)->ptp_dmvpn = 0;
|
|
|
|
if (IF_DEF_PARAMS(ifp)->type == old_type)
|
|
return CMD_SUCCESS;
|
|
@@ -9888,6 +9897,10 @@ static int config_write_interface_one(st
|
|
vty_out(vty, " ip ospf network %s",
|
|
ospf_int_type_str
|
|
[params->type]);
|
|
+ if (params->type
|
|
+ == OSPF_IFTYPE_POINTOPOINT
|
|
+ && params->ptp_dmvpn)
|
|
+ vty_out(vty, " dmvpn");
|
|
if (params != IF_DEF_PARAMS(ifp) && rn)
|
|
vty_out(vty, " %s",
|
|
inet_ntoa(
|
|
--- a/ospfd/ospfd.c
|
|
+++ b/ospfd/ospfd.c
|
|
@@ -1004,6 +1004,7 @@ static void add_ospf_interface(struct co
|
|
/* If network type is specified previously,
|
|
skip network type setting. */
|
|
oi->type = IF_DEF_PARAMS(co->ifp)->type;
|
|
+ oi->ptp_dmvpn = IF_DEF_PARAMS(co->ifp)->ptp_dmvpn;
|
|
|
|
/* Add pseudo neighbor. */
|
|
ospf_nbr_self_reset(oi, oi->ospf->router_id);
|
|
--- a/doc/user/nhrpd.rst
|
|
+++ b/doc/user/nhrpd.rst
|
|
@@ -189,6 +189,37 @@ and
|
|
https://git.alpinelinux.org/user/tteras/strongswan/log/?h=tteras
|
|
git repositories for the patches.
|
|
|
|
+.. _multicast-functionality:
|
|
+
|
|
+Multicast Functionality
|
|
+=======================
|
|
+
|
|
+nhrpd can be configured to forward multicast packets, allowing routing
|
|
+protocols that use multicast (such as OSPF) to be supported in the DMVPN
|
|
+network.
|
|
+
|
|
+This support requires an iptables NFLOG rule to allow nhrpd to intercept
|
|
+multicast packets. A second iptables rule is also usually used to drop the
|
|
+original multicast packet.
|
|
+
|
|
+ .. code-block:: shell
|
|
+
|
|
+ iptables -A OUTPUT -d 224.0.0.0/24 -o gre1 -j NFLOG --nflog-group 2
|
|
+ iptables -A OUTPUT -d 224.0.0.0/24 -o gre1 -j DROP
|
|
+
|
|
+.. index:: nhrp multicast-nflog-group (1-65535)
|
|
+.. clicmd:: nhrp multicast-nflog-group (1-65535)
|
|
+
|
|
+ Sets the nflog group that nhrpd will listen on for multicast packets. This
|
|
+ value must match the nflog-group value set in the iptables rule.
|
|
+
|
|
+.. index:: ip nhrp map multicast A.B.C.D|X:X::X:X A.B.C.D|dynamic
|
|
+.. clicmd:: ip nhrp map multicast A.B.C.D|X:X::X:X A.B.C.D|dynamic
|
|
+
|
|
+ Sends multicast packets to the specified NBMA address. If dynamic is
|
|
+ specified then destination NBMA address (or addresses) are learnt
|
|
+ dynamically.
|
|
+
|
|
.. _nhrp-events:
|
|
|
|
NHRP Events
|
|
--- a/doc/user/ospfd.rst
|
|
+++ b/doc/user/ospfd.rst
|
|
@@ -687,8 +687,8 @@ Interfaces
|
|
:clicmd:`ip ospf dead-interval minimal hello-multiplier (2-20)` is also
|
|
specified for the interface.
|
|
|
|
-.. index:: ip ospf network (broadcast|non-broadcast|point-to-multipoint|point-to-point)
|
|
-.. clicmd:: ip ospf network (broadcast|non-broadcast|point-to-multipoint|point-to-point)
|
|
+.. index:: ip ospf network (broadcast|non-broadcast|point-to-multipoint|point-to-point [dmvpn])
|
|
+.. clicmd:: ip ospf network (broadcast|non-broadcast|point-to-multipoint|point-to-point [dmvpn])
|
|
|
|
When configuring a point-to-point network on an interface and the interface
|
|
has a /32 address associated with then OSPF will treat the interface
|
|
@@ -870,6 +870,9 @@ Redistribution
|
|
.. index:: no router zebra
|
|
.. clicmd:: no router zebra
|
|
|
|
+ When used in a DMVPN network at a spoke, this OSPF will be configured in
|
|
+ point-to-point, but the HUB will be a point-to-multipoint. To make this
|
|
+ topology work, specify the optional 'dmvpn' parameter at the spoke.
|
|
|
|
.. _showing-ospf-information:
|
|
|
|
--- a/nhrpd/netlink.h
|
|
+++ b/nhrpd/netlink.h
|
|
@@ -13,6 +13,7 @@ union sockunion;
|
|
struct interface;
|
|
|
|
extern int netlink_nflog_group;
|
|
+extern int netlink_mcast_nflog_group;
|
|
extern int netlink_req_fd;
|
|
|
|
void netlink_init(void);
|
|
--- a/ospfd/ospf_packet.c
|
|
+++ b/ospfd/ospf_packet.c
|
|
@@ -802,7 +802,13 @@ static int ospf_write(struct thread *thr
|
|
inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off,
|
|
iph.ip_len, oi->ifp->name, oi->ifp->mtu);
|
|
|
|
- if (ret < 0)
|
|
+ /* sendmsg will return EPERM if firewall is blocking sending.
|
|
+ * This is a normal situation when 'ip nhrp map multicast xxx'
|
|
+ * is being used to send multicast packets to DMVPN peers. In
|
|
+ * that case the original message is blocked with iptables rule
|
|
+ * causing the EPERM result
|
|
+ */
|
|
+ if (ret < 0 && errno != EPERM)
|
|
flog_err(
|
|
EC_LIB_SOCKET,
|
|
"*** sendmsg in ospf_write failed to %s, id %d, off %d, len %d, interface %s, mtu %u: %s",
|
|
@@ -910,8 +916,11 @@ static void ospf_hello(struct ip *iph, s
|
|
|
|
/* Compare network mask. */
|
|
/* Checking is ignored for Point-to-Point and Virtual link. */
|
|
+ /* Checking is also ignored for Point-to-Multipoint with /32 prefix */
|
|
if (oi->type != OSPF_IFTYPE_POINTOPOINT
|
|
- && oi->type != OSPF_IFTYPE_VIRTUALLINK)
|
|
+ && oi->type != OSPF_IFTYPE_VIRTUALLINK
|
|
+ && !(oi->type == OSPF_IFTYPE_POINTOMULTIPOINT
|
|
+ && oi->address->prefixlen == IPV4_MAX_BITLEN))
|
|
if (oi->address->prefixlen != p.prefixlen) {
|
|
flog_warn(
|
|
EC_OSPF_PACKET,
|
|
@@ -2439,6 +2448,11 @@ static int ospf_check_network_mask(struc
|
|
|| oi->type == OSPF_IFTYPE_VIRTUALLINK)
|
|
return 1;
|
|
|
|
+ /* Ignore mask check for max prefix length (32) */
|
|
+ if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT
|
|
+ && oi->address->prefixlen == IPV4_MAX_BITLEN)
|
|
+ return 1;
|
|
+
|
|
masklen2ip(oi->address->prefixlen, &mask);
|
|
|
|
me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr;
|