Adding upstream version 8.4.4.upstream/8.4.4upstream

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

1 files changed, 590 insertions, 0 deletions

diff --git a/pimd/mtracebis.c b/pimd/mtracebis.c
new file mode 100644
index 0000000..3b69964
--- /dev/null
+++ b/pimd/mtracebis.c
@@ -0,0 +1,590 @@
+/*
+ * Multicast Traceroute for FRRouting
+ * Copyright (C) 2018  Mladen Sablic
+ *
+ * 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>
+
+#ifdef __linux__
+
+#include "pim_igmp_mtrace.h"
+
+#include "checksum.h"
+#include "prefix.h"
+#include "mtracebis_routeget.h"
+#include <sys/select.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <netdb.h>
+
+#define MTRACEBIS_VERSION "0.1"
+#define MTRACE_TIMEOUT (5)
+
+#define IP_HDR_LEN (sizeof(struct ip))
+#define IP_RA_LEN (4)
+#define MTRACE_BUF_LEN (MTRACE_HDR_SIZE + (MTRACE_MAX_HOPS * MTRACE_RSP_SIZE))
+#define IP_AND_MTRACE_BUF_LEN (IP_HDR_LEN + IP_RA_LEN + MTRACE_BUF_LEN)
+
+static const char *progname;
+static void usage(void)
+{
+	fprintf(stderr, "Usage : %s <multicast source> [<multicast group>]\n",
+		progname);
+}
+static void version(void)
+{
+	fprintf(stderr, "%s %s\n", progname, MTRACEBIS_VERSION);
+}
+
+static void print_host(struct in_addr addr)
+{
+	struct hostent *h;
+	char buf[PREFIX_STRLEN];
+
+	h = gethostbyaddr(&addr, sizeof(addr), AF_INET);
+	if (h == NULL)
+		printf("?");
+	else
+		printf("%s", h->h_name);
+	printf(" (%s) ", inet_ntop(AF_INET, &addr, buf, sizeof(buf)));
+}
+
+static void print_line_no(int i)
+{
+	printf("%3d  ", -i);
+}
+
+static const char *rtg_proto_str(enum mtrace_rtg_proto proto)
+{
+	static char buf[80];
+
+	buf[0] = '\0';
+
+	switch (proto) {
+	case MTRACE_RTG_PROTO_DVMRP:
+		return "DVMRP";
+	case MTRACE_RTG_PROTO_MOSPF:
+		return "MOSPF";
+	case MTRACE_RTG_PROTO_PIM:
+		return "PIM";
+	case MTRACE_RTG_PROTO_CBT:
+		return "CBT";
+	case MTRACE_RTG_PROTO_PIM_SPECIAL:
+		return "PIM special";
+	case MTRACE_RTG_PROTO_PIM_STATIC:
+		return "PIM static";
+	case MTRACE_RTG_PROTO_DVMRP_STATIC:
+		return "DVMRP static";
+	case MTRACE_RTG_PROTO_PIM_MBGP:
+		return "PIM MBGP";
+	case MTRACE_RTG_PROTO_CBT_SPECIAL:
+		return "CBT special";
+	case MTRACE_RTG_PROTO_CBT_STATIC:
+		return "CBT static";
+	case MTRACE_RTG_PROTO_PIM_ASSERT:
+		return "PIM assert";
+	default:
+		snprintf(buf, sizeof(buf), "unknown protocol (%d)", proto);
+		return buf;
+	}
+}
+
+static void print_rtg_proto(uint32_t rtg_proto)
+{
+	printf("%s", rtg_proto_str(rtg_proto));
+}
+
+static void print_fwd_ttl(uint32_t fwd_ttl)
+{
+	printf("thresh^ %d", fwd_ttl);
+}
+
+static const char *fwd_code_str(enum mtrace_fwd_code code)
+{
+	static char buf[80];
+
+	buf[0] = '\0';
+
+	switch (code) {
+	case MTRACE_FWD_CODE_NO_ERROR:
+		return "no error";
+	case MTRACE_FWD_CODE_WRONG_IF:
+		return "wrong interface";
+	case MTRACE_FWD_CODE_PRUNE_SENT:
+		return "prune sent";
+	case MTRACE_FWD_CODE_PRUNE_RCVD:
+		return "prune received";
+	case MTRACE_FWD_CODE_SCOPED:
+		return "scoped";
+	case MTRACE_FWD_CODE_NO_ROUTE:
+		return "no route";
+	case MTRACE_FWD_CODE_WRONG_LAST_HOP:
+		return "wrong last hop";
+	case MTRACE_FWD_CODE_NOT_FORWARDING:
+		return "not forwarding";
+	case MTRACE_FWD_CODE_REACHED_RP:
+		return "reached RP";
+	case MTRACE_FWD_CODE_RPF_IF:
+		return "RPF interface";
+	case MTRACE_FWD_CODE_NO_MULTICAST:
+		return "no multicast";
+	case MTRACE_FWD_CODE_INFO_HIDDEN:
+		return "info hidden";
+	case MTRACE_FWD_CODE_NO_SPACE:
+		return "no space";
+	case MTRACE_FWD_CODE_OLD_ROUTER:
+		return "old router";
+	case MTRACE_FWD_CODE_ADMIN_PROHIB:
+		return "admin. prohib.";
+	default:
+		snprintf(buf, sizeof(buf), "unknown fwd. code (%d)", code);
+		return buf;
+	}
+}
+
+static void print_fwd_code(uint32_t fwd_code)
+{
+	printf("%s", fwd_code_str(fwd_code));
+}
+
+static void print_rsp(struct igmp_mtrace_rsp *rsp)
+{
+	print_host(rsp->outgoing);
+	if (rsp->fwd_code == 0 || rsp->fwd_code == MTRACE_FWD_CODE_REACHED_RP) {
+		print_rtg_proto(rsp->rtg_proto);
+		printf(" ");
+		if (rsp->fwd_code == MTRACE_FWD_CODE_REACHED_RP)
+			printf("(RP) ");
+		if (rsp->rtg_proto == MTRACE_RTG_PROTO_PIM) {
+			switch (rsp->src_mask) {
+			case MTRACE_SRC_MASK_GROUP:
+				printf("(*,G) ");
+				break;
+			case MTRACE_SRC_MASK_SOURCE:
+				printf("(S,G) ");
+				break;
+			}
+		}
+		print_fwd_ttl(rsp->fwd_ttl);
+	} else {
+		print_fwd_code(rsp->fwd_code);
+	}
+	printf("\n");
+}
+
+static void print_dest(struct igmp_mtrace *mtrace)
+{
+	print_line_no(0);
+	print_host(mtrace->dst_addr);
+	printf("\n");
+}
+
+static void print_summary(struct igmp_mtrace *mtrace, int hops, long msec)
+{
+	int i;
+	int t = 0;
+
+	for (i = 0; i < hops; i++)
+		t += mtrace->rsp[i].fwd_ttl;
+
+	printf("Round trip time %ld ms; total ttl of %d required.\n", msec, t);
+}
+
+static void print_responses(struct igmp_mtrace *mtrace, int hops, long msec)
+{
+	int i;
+
+	print_dest(mtrace);
+
+	for (i = 0; i < hops; i++) {
+		print_line_no(i + 1);
+		print_rsp(&mtrace->rsp[i]);
+	}
+	print_summary(mtrace, hops, msec);
+}
+
+static int send_query(int fd, struct in_addr to_addr,
+		      struct igmp_mtrace *mtrace)
+{
+	struct sockaddr_in to;
+	socklen_t tolen;
+	int sent;
+
+	memset(&to, 0, sizeof(to));
+	to.sin_family = AF_INET;
+	to.sin_addr = to_addr;
+	tolen = sizeof(to);
+
+	sent = sendto(fd, (char *)mtrace, sizeof(*mtrace), MSG_DONTWAIT,
+		      (struct sockaddr *)&to, tolen);
+
+	if (sent < 1)
+		return -1;
+	return 0;
+}
+
+static void print_query(struct igmp_mtrace *mtrace)
+{
+	char src_str[INET_ADDRSTRLEN];
+	char dst_str[INET_ADDRSTRLEN];
+	char grp_str[INET_ADDRSTRLEN];
+
+	printf("* Mtrace from %s to %s via group %s\n",
+	       inet_ntop(AF_INET, &mtrace->src_addr, src_str, sizeof(src_str)),
+	       inet_ntop(AF_INET, &mtrace->dst_addr, dst_str, sizeof(dst_str)),
+	       inet_ntop(AF_INET, &mtrace->grp_addr, grp_str, sizeof(grp_str)));
+}
+
+static int recv_response(int fd, int *hops, struct igmp_mtrace *mtracer)
+{
+	int recvd;
+	char mtrace_buf[IP_AND_MTRACE_BUF_LEN];
+	struct ip *ip;
+	struct igmp_mtrace *mtrace;
+	int mtrace_len;
+	int responses;
+	unsigned short sum;
+	size_t mtrace_off;
+	size_t ip_len;
+
+	recvd = recvfrom(fd, mtrace_buf, IP_AND_MTRACE_BUF_LEN, 0, NULL, 0);
+
+	if (recvd < 1) {
+		fprintf(stderr, "recvfrom error: %s\n", strerror(errno));
+		return -1;
+	}
+
+	if (recvd < (int)sizeof(struct ip)) {
+		fprintf(stderr, "no ip header\n");
+		return -1;
+	}
+
+	ip = (struct ip *)mtrace_buf;
+
+	if (ip->ip_v != 4) {
+		fprintf(stderr, "IP not version 4\n");
+		return -1;
+	}
+
+	sum = ip->ip_sum;
+	ip->ip_sum = 0;
+
+	if (sum != in_cksum(ip, ip->ip_hl * 4))
+		return -1;
+
+	/* Header overflow check */
+	mtrace_off = 4 * ip->ip_hl;
+	if (mtrace_off > MTRACE_BUF_LEN)
+		return -1;
+
+	/* Underflow/overflow check */
+	ip_len = ntohs(ip->ip_len);
+	if (ip_len < mtrace_off || ip_len < MTRACE_HDR_SIZE
+	    || ip_len > MTRACE_BUF_LEN)
+		return -1;
+
+	mtrace_len = ip_len - mtrace_off;
+	mtrace = (struct igmp_mtrace *)(mtrace_buf + mtrace_off);
+
+	sum = mtrace->checksum;
+	mtrace->checksum = 0;
+	if (sum != in_cksum(mtrace, mtrace_len)) {
+		fprintf(stderr, "mtrace checksum wrong\n");
+		return -1;
+	}
+
+	if (mtrace->type != PIM_IGMP_MTRACE_RESPONSE)
+		return -1;
+
+
+	responses = mtrace_len - sizeof(struct igmp_mtrace);
+	responses /= sizeof(struct igmp_mtrace_rsp);
+
+	if (responses > MTRACE_MAX_HOPS) {
+		fprintf(stderr, "mtrace too large\n");
+		return -1;
+	}
+
+	if (hops)
+		*hops = responses;
+
+	if (mtracer)
+		memcpy(mtracer, mtrace, mtrace_len);
+
+	return 0;
+}
+
+static int wait_for_response(int fd, int *hops, struct igmp_mtrace *mtrace,
+			     long *ret_msec)
+{
+	fd_set readfds;
+	struct timeval timeout;
+	int ret;
+	long msec, rmsec, tmsec;
+
+	FD_ZERO(&readfds);
+	FD_SET(fd, &readfds);
+
+	memset(&timeout, 0, sizeof(timeout));
+
+	timeout.tv_sec = MTRACE_TIMEOUT;
+
+	tmsec = timeout.tv_sec * 1000 + timeout.tv_usec / 1000;
+	do {
+		ret = select(fd + 1, &readfds, NULL, NULL, &timeout);
+		if (ret <= 0)
+			return ret;
+		rmsec = timeout.tv_sec * 1000 + timeout.tv_usec / 1000;
+		msec = tmsec - rmsec;
+	} while (recv_response(fd, hops, mtrace) != 0);
+
+	if (ret_msec)
+		*ret_msec = msec;
+
+	return ret;
+}
+
+static bool check_end(struct igmp_mtrace *mtrace, int hops)
+{
+	return mtrace->src_addr.s_addr == mtrace->rsp[hops - 1].prev_hop.s_addr;
+}
+
+int main(int argc, char *const argv[])
+{
+	struct in_addr mc_source;
+	struct in_addr mc_group;
+	struct in_addr iface_addr;
+	struct in_addr gw_addr;
+	struct in_addr mtrace_addr;
+	struct igmp_mtrace mtrace;
+	struct igmp_mtrace *mtracep;
+	int hops = 255;
+	int rhops;
+	int maxhops = 255;
+	int perhop = 3;
+	int ifindex;
+	int unicast = 1;
+	int ttl = 64;
+	int fd = -1;
+	int ret = -1;
+	int c;
+	long msec;
+	int i, j;
+	char ifname[IF_NAMESIZE];
+	char mbuf[MTRACE_BUF_LEN];
+	bool not_group;
+
+	mtrace_addr.s_addr = inet_addr("224.0.1.32");
+
+	uid_t uid = getuid();
+
+	if (uid != 0) {
+		printf("must run as root\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (argc <= 0)
+		progname = "mtracebis";
+	else
+		progname = argv[0];
+
+	if (argc != 2 && argc != 3) {
+		usage();
+		exit(EXIT_FAILURE);
+	}
+
+	while (1) {
+		static struct option long_options[] = {
+			{"help", no_argument, 0, 'h'},
+			{"version", no_argument, 0, 'v'},
+			{0, 0, 0, 0}};
+		int option_index = 0;
+
+		c = getopt_long(argc, argv, "vh", long_options, &option_index);
+
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'h':
+			usage();
+			exit(0);
+		case 'v':
+			version();
+			exit(0);
+		default:
+			usage();
+			exit(EXIT_FAILURE);
+		}
+	}
+	if (inet_pton(AF_INET, argv[1], &mc_source) != 1) {
+		usage();
+		fprintf(stderr, "%s: %s is not a valid IPv4 address\n", argv[0],
+			argv[1]);
+		exit(EXIT_FAILURE);
+	}
+
+	mc_group.s_addr = INADDR_ANY;
+	not_group = false;
+
+	if (argc == 3) {
+		if (inet_pton(AF_INET, argv[2], &mc_group) != 1)
+			not_group = true;
+		if (!not_group && !IPV4_CLASS_DE(ntohl(mc_group.s_addr)))
+			not_group = true;
+	}
+
+	if (not_group) {
+		usage();
+		fprintf(stderr, "%s: %s is not a valid IPv4 group address\n",
+			argv[0], argv[2]);
+		exit(EXIT_FAILURE);
+	}
+
+	ifindex = routeget(mc_source, &iface_addr, &gw_addr);
+	if (ifindex < 0) {
+		fprintf(stderr, "%s: failed to get route to source %s\n",
+			argv[0], argv[1]);
+		exit(EXIT_FAILURE);
+	}
+
+	if (if_indextoname(ifindex, ifname) == NULL) {
+		fprintf(stderr, "%s: if_indextoname error: %s\n", argv[0],
+			strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	/* zero mtrace struct */
+	memset((char *)&mtrace, 0, sizeof(mtrace));
+
+	/* set up query */
+	mtrace.type = PIM_IGMP_MTRACE_QUERY_REQUEST;
+	mtrace.hops = hops;
+	mtrace.checksum = 0;
+	mtrace.grp_addr = mc_group;
+	mtrace.src_addr = mc_source;
+	mtrace.dst_addr = iface_addr;
+	mtrace.rsp_addr = unicast ? iface_addr : mtrace_addr;
+	mtrace.rsp_ttl = ttl;
+	mtrace.qry_id = 0xffffff & time(NULL);
+
+	mtrace.checksum = in_cksum(&mtrace, sizeof(mtrace));
+
+	fd = socket(AF_INET, SOCK_RAW, IPPROTO_IGMP);
+
+	if (fd < 1) {
+		fprintf(stderr, "%s: socket error: %s\n", argv[0],
+			strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifname,
+			 strlen(ifname));
+
+	if (ret < 0) {
+		fprintf(stderr, "%s: setsockopt error: %s\n", argv[0],
+			strerror(errno));
+		ret = EXIT_FAILURE;
+		goto close_fd;
+	}
+
+	print_query(&mtrace);
+	if (send_query(fd, gw_addr, &mtrace) < 0) {
+		fprintf(stderr, "%s: sendto error: %s\n", argv[0],
+			strerror(errno));
+		ret = EXIT_FAILURE;
+		goto close_fd;
+	}
+	printf("Querying full reverse path...\n");
+	mtracep = (struct igmp_mtrace *)mbuf;
+	ret = wait_for_response(fd, &rhops, mtracep, &msec);
+	if (ret > 0) {
+		print_responses(mtracep, rhops, msec);
+		ret = 0;
+		goto close_fd;
+	}
+	if (ret < 0) {
+		fprintf(stderr, "%s: select error: %s\n", argv[0],
+			strerror(errno));
+		ret = EXIT_FAILURE;
+		goto close_fd;
+	}
+	printf(" * ");
+	printf("switching to hop-by-hop:\n");
+	print_dest(&mtrace);
+	for (i = 1; i < maxhops; i++) {
+		print_line_no(i);
+		mtrace.hops = i;
+		for (j = 0; j < perhop; j++) {
+			mtrace.qry_id++;
+			mtrace.checksum = 0;
+			mtrace.checksum = in_cksum(&mtrace, sizeof(mtrace));
+			if (send_query(fd, gw_addr, &mtrace) < 0) {
+				fprintf(stderr, "%s: sendto error: %s\n",
+					argv[0], strerror(errno));
+				ret = EXIT_FAILURE;
+				goto close_fd;
+			}
+			ret = wait_for_response(fd, &rhops, mtracep, &msec);
+			if (ret > 0) {
+				if (check_end(mtracep, rhops)) {
+					print_rsp(&mtracep->rsp[rhops - 1]);
+					print_summary(mtracep, rhops, msec);
+					ret = 0;
+					goto close_fd;
+				}
+				if (i > rhops) {
+					printf(" * ...giving up.\n");
+					ret = 0;
+					goto close_fd;
+				}
+				print_rsp(&mtracep->rsp[rhops - 1]);
+				break;
+			}
+			printf(" *");
+		}
+		if (ret <= 0)
+			printf("\n");
+	}
+	ret = 0;
+close_fd:
+	close(fd);
+	exit(ret);
+}
+
+#else /* __linux__ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+	printf("%s implemented only for GNU/Linux\n", argv[0]);
+	exit(0);
+}
+
+#endif /* __linux__ */