Adding upstream version 9.1.upstream/9.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 420 insertions, 0 deletions

diff --git a/pimd/pim_sock.c b/pimd/pim_sock.c
new file mode 100644
index 0000000..6c65c5d
--- /dev/null
+++ b/pimd/pim_sock.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PIM for Quagga
+ * Copyright (C) 2008  Everton da Silva Marques
+ */
+
+#include <zebra.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/igmp.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <errno.h>
+
+#include "log.h"
+#include "privs.h"
+#include "if.h"
+#include "vrf.h"
+#include "sockopt.h"
+#include "lib_errors.h"
+#include "network.h"
+
+#include "pimd.h"
+#include "pim_instance.h"
+#include "pim_mroute.h"
+#include "pim_iface.h"
+#include "pim_sock.h"
+#include "pim_str.h"
+
+#if PIM_IPV == 4
+#define setsockopt_iptos setsockopt_ipv4_tos
+#define setsockopt_multicast_loop setsockopt_ipv4_multicast_loop
+#else
+#define setsockopt_iptos setsockopt_ipv6_tclass
+#define setsockopt_multicast_loop setsockopt_ipv6_multicast_loop
+#endif
+
+int pim_socket_raw(int protocol)
+{
+	int fd;
+
+	frr_with_privs(&pimd_privs) {
+		fd = socket(PIM_AF, SOCK_RAW, protocol);
+	}
+
+	if (fd < 0) {
+		zlog_warn("Could not create raw socket: errno=%d: %s", errno,
+			  safe_strerror(errno));
+		return PIM_SOCK_ERR_SOCKET;
+	}
+
+	return fd;
+}
+
+void pim_socket_ip_hdr(int fd)
+{
+	frr_with_privs(&pimd_privs) {
+#if PIM_IPV == 4
+		const int on = 1;
+
+		if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)))
+			zlog_err("%s: Could not turn on IP_HDRINCL option: %m",
+				 __func__);
+#endif
+	}
+}
+
+/*
+ * Given a socket and a interface,
+ * Bind that socket to that interface
+ */
+int pim_socket_bind(int fd, struct interface *ifp)
+{
+	int ret = 0;
+
+#ifdef SO_BINDTODEVICE
+	frr_with_privs(&pimd_privs) {
+		ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifp->name,
+				 strlen(ifp->name));
+	}
+#endif
+	return ret;
+}
+
+#if PIM_IPV == 4
+static inline int pim_setsockopt(int protocol, int fd, struct interface *ifp)
+{
+	int one = 1;
+	int ttl = 1;
+
+#if defined(HAVE_IP_PKTINFO)
+	/* Linux and Solaris IP_PKTINFO */
+	if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)))
+		zlog_warn("Could not set PKTINFO on socket fd=%d: %m", fd);
+#elif defined(HAVE_IP_RECVDSTADDR)
+	/* BSD IP_RECVDSTADDR */
+	if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &one, sizeof(one)))
+		zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: %m",
+			  fd);
+#else
+	flog_err(
+		EC_LIB_DEVELOPMENT,
+		"Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()");
+	close(fd);
+	return PIM_SOCK_ERR_DSTADDR;
+#endif
+
+	/* Set router alert (RFC 2113) for all IGMP messages (RFC
+	 * 3376 4. Message Formats)*/
+	if (protocol == IPPROTO_IGMP) {
+		uint8_t ra[4];
+
+		ra[0] = 148;
+		ra[1] = 4;
+		ra[2] = 0;
+		ra[3] = 0;
+		if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) {
+			zlog_warn(
+				"Could not set Router Alert Option on socket fd=%d: %m",
+				fd);
+			close(fd);
+			return PIM_SOCK_ERR_RA;
+		}
+	}
+
+	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl))) {
+		zlog_warn("Could not set multicast TTL=%d on socket fd=%d: %m",
+			  ttl, fd);
+		close(fd);
+		return PIM_SOCK_ERR_TTL;
+	}
+
+	if (setsockopt_ipv4_multicast_if(fd, PIMADDR_ANY, ifp->ifindex)) {
+		zlog_warn(
+			"Could not set Outgoing Interface Option on socket fd=%d: %m",
+			fd);
+		close(fd);
+		return PIM_SOCK_ERR_IFACE;
+	}
+
+	return 0;
+}
+#else /* PIM_IPV != 4 */
+static inline int pim_setsockopt(int protocol, int fd, struct interface *ifp)
+{
+	int ttl = 1;
+	struct ipv6_mreq mreq = {};
+
+	setsockopt_ipv6_pktinfo(fd, 1);
+	setsockopt_ipv6_multicast_hops(fd, ttl);
+
+	mreq.ipv6mr_interface = ifp->ifindex;
+	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &mreq,
+		       sizeof(mreq))) {
+		zlog_warn(
+			"Could not set Outgoing Interface Option on socket fd=%d: %m",
+			fd);
+		close(fd);
+		return PIM_SOCK_ERR_IFACE;
+	}
+
+	return 0;
+}
+#endif
+
+int pim_reg_sock(void)
+{
+	int fd;
+	long flags;
+
+	frr_with_privs (&pimd_privs) {
+		fd = socket(PIM_AF, SOCK_RAW, PIM_PROTO_REG);
+	}
+
+	if (fd < 0) {
+		zlog_warn("Could not create raw socket: errno=%d: %s", errno,
+			  safe_strerror(errno));
+		return PIM_SOCK_ERR_SOCKET;
+	}
+
+	if (sockopt_reuseaddr(fd)) {
+		close(fd);
+		return PIM_SOCK_ERR_REUSE;
+	}
+
+	flags = fcntl(fd, F_GETFL, 0);
+	if (flags < 0) {
+		zlog_warn(
+			"Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
+			fd, errno, safe_strerror(errno));
+		close(fd);
+		return PIM_SOCK_ERR_NONBLOCK_GETFL;
+	}
+
+	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) {
+		zlog_warn(
+			"Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
+			fd, errno, safe_strerror(errno));
+		close(fd);
+		return PIM_SOCK_ERR_NONBLOCK_SETFL;
+	}
+
+	return fd;
+}
+
+int pim_socket_mcast(int protocol, pim_addr ifaddr, struct interface *ifp,
+		     uint8_t loop)
+{
+	int fd;
+	int ret;
+
+	fd = pim_socket_raw(protocol);
+	if (fd < 0) {
+		zlog_warn("Could not create multicast socket: errno=%d: %s",
+			  errno, safe_strerror(errno));
+		return PIM_SOCK_ERR_SOCKET;
+	}
+
+	/* XXX: if SO_BINDTODEVICE isn't available, use IP_PKTINFO / IP_RECVIF
+	 * to emulate behaviour?  Or change to only use 1 socket for all
+	 * interfaces? */
+	ret = pim_socket_bind(fd, ifp);
+	if (ret) {
+		close(fd);
+		zlog_warn("Could not set fd: %d for interface: %s to device",
+			  fd, ifp->name);
+		return PIM_SOCK_ERR_BIND;
+	}
+
+	set_nonblocking(fd);
+	sockopt_reuseaddr(fd);
+	setsockopt_so_recvbuf(fd, 8 * 1024 * 1024);
+
+	ret = pim_setsockopt(protocol, fd, ifp);
+	if (ret) {
+		zlog_warn("pim_setsockopt failed for interface: %s to device ",
+			  ifp->name);
+		return ret;
+	}
+
+	/* leftover common sockopts */
+	if (setsockopt_multicast_loop(fd, loop)) {
+		zlog_warn(
+			"Could not %s Multicast Loopback Option on socket fd=%d: %m",
+			loop ? "enable" : "disable", fd);
+		close(fd);
+		return PIM_SOCK_ERR_LOOP;
+	}
+
+	/* Set Tx socket DSCP byte */
+	if (setsockopt_iptos(fd, IPTOS_PREC_INTERNETCONTROL))
+		zlog_warn("can't set sockopt IP[V6]_TOS to socket %d: %m", fd);
+
+	return fd;
+}
+
+int pim_socket_join(int fd, pim_addr group, pim_addr ifaddr, ifindex_t ifindex,
+		    struct pim_interface *pim_ifp)
+{
+	int ret;
+
+#if PIM_IPV == 4
+	ret = setsockopt_ipv4_multicast(fd, IP_ADD_MEMBERSHIP, ifaddr,
+					group.s_addr, ifindex);
+#else
+	struct ipv6_mreq opt;
+
+	memcpy(&opt.ipv6mr_multiaddr, &group, 16);
+	opt.ipv6mr_interface = ifindex;
+	ret = setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &opt, sizeof(opt));
+#endif
+
+	pim_ifp->igmp_ifstat_joins_sent++;
+
+	if (ret) {
+		flog_err(
+			EC_LIB_SOCKET,
+			"Failure socket joining fd=%d group %pPAs on interface address %pPAs: %m",
+			fd, &group, &ifaddr);
+		pim_ifp->igmp_ifstat_joins_failed++;
+		return ret;
+	}
+
+	if (PIM_DEBUG_TRACE)
+		zlog_debug(
+			"Socket fd=%d joined group %pPAs on interface address %pPAs",
+			fd, &group, &ifaddr);
+	return ret;
+}
+
+#if PIM_IPV == 4
+static void cmsg_getdstaddr(struct msghdr *mh, struct sockaddr_storage *dst,
+			    ifindex_t *ifindex)
+{
+	struct cmsghdr *cmsg;
+	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
+
+	for (cmsg = CMSG_FIRSTHDR(mh); cmsg != NULL;
+	     cmsg = CMSG_NXTHDR(mh, cmsg)) {
+#ifdef HAVE_IP_PKTINFO
+		if ((cmsg->cmsg_level == IPPROTO_IP) &&
+		    (cmsg->cmsg_type == IP_PKTINFO)) {
+			struct in_pktinfo *i;
+
+			i = (struct in_pktinfo *)CMSG_DATA(cmsg);
+			if (dst4)
+				dst4->sin_addr = i->ipi_addr;
+			if (ifindex)
+				*ifindex = i->ipi_ifindex;
+
+			break;
+		}
+#endif
+
+#ifdef HAVE_IP_RECVDSTADDR
+		if ((cmsg->cmsg_level == IPPROTO_IP) &&
+		    (cmsg->cmsg_type == IP_RECVDSTADDR)) {
+			struct in_addr *i = (struct in_addr *)CMSG_DATA(cmsg);
+
+			if (dst4)
+				dst4->sin_addr = *i;
+
+			break;
+		}
+#endif
+
+#if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
+		if (cmsg->cmsg_type == IP_RECVIF)
+			if (ifindex)
+				*ifindex = CMSG_IFINDEX(cmsg);
+#endif
+	}
+}
+#else  /* PIM_IPV != 4 */
+static void cmsg_getdstaddr(struct msghdr *mh, struct sockaddr_storage *dst,
+			    ifindex_t *ifindex)
+{
+	struct cmsghdr *cmsg;
+	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
+
+	for (cmsg = CMSG_FIRSTHDR(mh); cmsg != NULL;
+	     cmsg = CMSG_NXTHDR(mh, cmsg)) {
+		if ((cmsg->cmsg_level == IPPROTO_IPV6) &&
+		    (cmsg->cmsg_type == IPV6_PKTINFO)) {
+			struct in6_pktinfo *i;
+
+			i = (struct in6_pktinfo *)CMSG_DATA(cmsg);
+
+			if (dst6)
+				dst6->sin6_addr = i->ipi6_addr;
+			if (ifindex)
+				*ifindex = i->ipi6_ifindex;
+			break;
+		}
+	}
+}
+#endif /* PIM_IPV != 4 */
+
+int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
+			  struct sockaddr_storage *from, socklen_t *fromlen,
+			  struct sockaddr_storage *to, socklen_t *tolen,
+			  ifindex_t *ifindex)
+{
+	struct msghdr msgh;
+	struct iovec iov;
+	char cbuf[1000];
+	int err;
+
+	/*
+	 * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
+	 * Use getsockname() to get sin_port.
+	 */
+	if (to) {
+		socklen_t to_len = sizeof(*to);
+
+		pim_socket_getsockname(fd, (struct sockaddr *)to, &to_len);
+
+		if (tolen)
+			*tolen = sizeof(*to);
+	}
+
+	memset(&msgh, 0, sizeof(msgh));
+	iov.iov_base = buf;
+	iov.iov_len = len;
+	msgh.msg_control = cbuf;
+	msgh.msg_controllen = sizeof(cbuf);
+	msgh.msg_name = from;
+	msgh.msg_namelen = fromlen ? *fromlen : 0;
+	msgh.msg_iov = &iov;
+	msgh.msg_iovlen = 1;
+	msgh.msg_flags = 0;
+
+	err = recvmsg(fd, &msgh, 0);
+	if (err < 0)
+		return err;
+
+	if (fromlen)
+		*fromlen = msgh.msg_namelen;
+
+	cmsg_getdstaddr(&msgh, to, ifindex);
+
+	return err; /* len */
+}
+
+int pim_socket_getsockname(int fd, struct sockaddr *name, socklen_t *namelen)
+{
+	if (getsockname(fd, name, namelen)) {
+		int e = errno;
+		zlog_warn(
+			"Could not get Socket Name for socket fd=%d: errno=%d: %s",
+			fd, errno, safe_strerror(errno));
+		errno = e;
+		return PIM_SOCK_ERR_NAME;
+	}
+
+	return PIM_SOCK_ERR_NONE;
+}