[mirror_iproute2.git] / ip / tcp_metrics.c

/*
 * tcp_metrics.c	"ip tcp_metrics/tcpmetrics"
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		version 2 as published by the Free Software Foundation;
 *
 * Authors:	Julian Anastasov <ja@ssi.bg>, August 2012
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <linux/if.h>

#include <linux/genetlink.h>
#include <linux/tcp_metrics.h>

#include "utils.h"
#include "ip_common.h"
#include "libgenl.h"

static void usage(void)
{
	fprintf(stderr, "Usage: ip tcp_metrics/tcpmetrics { COMMAND | help }\n");
	fprintf(stderr, "       ip tcp_metrics { show | flush } SELECTOR\n");
	fprintf(stderr, "       ip tcp_metrics delete [ address ] ADDRESS\n");
	fprintf(stderr, "SELECTOR := [ [ address ] PREFIX ]\n");
	exit(-1);
}

/* netlink socket */
static struct rtnl_handle grth = { .fd = -1 };
static int genl_family = -1;

#define TCPM_REQUEST(_req, _bufsiz, _cmd, _flags) \
	GENL_REQUEST(_req, _bufsiz, genl_family, 0, \
		     TCP_METRICS_GENL_VERSION, _cmd, _flags)

#define CMD_LIST	0x0001	/* list, lst, show		*/
#define CMD_DEL		0x0002	/* delete, remove		*/
#define CMD_FLUSH	0x0004	/* flush			*/

static struct {
	char	*name;
	int	code;
} cmds[] = {
	{	"list",		CMD_LIST	},
	{	"lst",		CMD_LIST	},
	{	"show",		CMD_LIST	},
	{	"delete",	CMD_DEL		},
	{	"remove",	CMD_DEL		},
	{	"flush",	CMD_FLUSH	},
};

static char *metric_name[TCP_METRIC_MAX + 1] = {
	[TCP_METRIC_RTT]		= "rtt",
	[TCP_METRIC_RTTVAR]		= "rttvar",
	[TCP_METRIC_SSTHRESH]		= "ssthresh",
	[TCP_METRIC_CWND]		= "cwnd",
	[TCP_METRIC_REORDERING]		= "reordering",
};

static struct
{
	int flushed;
	char *flushb;
	int flushp;
	int flushe;
	int cmd;
	inet_prefix daddr;
} f;

static int flush_update(void)
{
	if (rtnl_send_check(&grth, f.flushb, f.flushp) < 0) {
		perror("Failed to send flush request\n");
		return -1;
	}
	f.flushp = 0;
	return 0;
}

static int process_msg(const struct sockaddr_nl *who, struct nlmsghdr *n,
		       void *arg)
{
	FILE *fp = (FILE *) arg;
	struct genlmsghdr *ghdr;
	struct rtattr *attrs[TCP_METRICS_ATTR_MAX + 1], *a;
	int len = n->nlmsg_len;
	char abuf[256];
	inet_prefix daddr, saddr;
	int family, i, atype, stype, dlen = 0, slen = 0;

	if (n->nlmsg_type != genl_family)
		return -1;

	len -= NLMSG_LENGTH(GENL_HDRLEN);
	if (len < 0)
		return -1;

	ghdr = NLMSG_DATA(n);
	if (ghdr->cmd != TCP_METRICS_CMD_GET)
		return 0;

	parse_rtattr(attrs, TCP_METRICS_ATTR_MAX, (void *) ghdr + GENL_HDRLEN,
		     len);

	a = attrs[TCP_METRICS_ATTR_ADDR_IPV4];
	if (a) {
		if (f.daddr.family && f.daddr.family != AF_INET)
			return 0;
		memcpy(&daddr.data, RTA_DATA(a), 4);
		daddr.bytelen = 4;
		family = AF_INET;
		atype = TCP_METRICS_ATTR_ADDR_IPV4;
		dlen = RTA_PAYLOAD(a);
	} else {
		a = attrs[TCP_METRICS_ATTR_ADDR_IPV6];
		if (a) {
			if (f.daddr.family && f.daddr.family != AF_INET6)
				return 0;
			memcpy(&daddr.data, RTA_DATA(a), 16);
			daddr.bytelen = 16;
			family = AF_INET6;
			atype = TCP_METRICS_ATTR_ADDR_IPV6;
			dlen = RTA_PAYLOAD(a);
		} else
			return 0;
	}

	a = attrs[TCP_METRICS_ATTR_SADDR_IPV4];
	if (a) {
		if (f.saddr.family && f.saddr.family != AF_INET)
			return 0;
		memcpy(&saddr.data, RTA_DATA(a), 4);
		saddr.bytelen = 4;
		stype = TCP_METRICS_ATTR_SADDR_IPV4;
		slen = RTA_PAYLOAD(a);
	} else {
		a = attrs[TCP_METRICS_ATTR_SADDR_IPV6];
		if (a) {
			if (f.saddr.family && f.saddr.family != AF_INET6)
				return 0;
			memcpy(&saddr.data, RTA_DATA(a), 16);
			saddr.bytelen = 16;
			stype = TCP_METRICS_ATTR_SADDR_IPV6;
			slen = RTA_PAYLOAD(a);
		}
	}

	if (f.daddr.family && f.daddr.bitlen >= 0 &&
	    inet_addr_match(&daddr, &f.daddr, f.daddr.bitlen))
		return 0;

	if (f.flushb) {
		struct nlmsghdr *fn;
		TCPM_REQUEST(req2, 128, TCP_METRICS_CMD_DEL, NLM_F_REQUEST);

		addattr_l(&req2.n, sizeof(req2), atype, &daddr.data,
			  daddr.bytelen);

		if (NLMSG_ALIGN(f.flushp) + req2.n.nlmsg_len > f.flushe) {
			if (flush_update())
				return -1;
		}
		fn = (struct nlmsghdr *) (f.flushb + NLMSG_ALIGN(f.flushp));
		memcpy(fn, &req2.n, req2.n.nlmsg_len);
		fn->nlmsg_seq = ++grth.seq;
		f.flushp = (((char *) fn) + req2.n.nlmsg_len) - f.flushb;
		f.flushed++;
		if (show_stats < 2)
			return 0;
	}

	if (f.cmd & (CMD_DEL | CMD_FLUSH))
		fprintf(fp, "Deleted ");

	fprintf(fp, "%s",
		format_host(family, dlen, &daddr.data, abuf, sizeof(abuf)));

	a = attrs[TCP_METRICS_ATTR_AGE];
	if (a) {
		unsigned long long val = rta_getattr_u64(a);

		fprintf(fp, " age %llu.%03llusec",
			val / 1000, val % 1000);
	}

	a = attrs[TCP_METRICS_ATTR_TW_TS_STAMP];
	if (a) {
		__s32 val = (__s32) rta_getattr_u32(a);
		__u32 tsval;

		a = attrs[TCP_METRICS_ATTR_TW_TSVAL];
		tsval = a ? rta_getattr_u32(a) : 0;
		fprintf(fp, " tw_ts %u/%dsec ago", tsval, val);
	}

	a = attrs[TCP_METRICS_ATTR_VALS];
	if (a) {
		struct rtattr *m[TCP_METRIC_MAX + 1 + 1];

		parse_rtattr_nested(m, TCP_METRIC_MAX + 1, a);

		for (i = 0; i < TCP_METRIC_MAX + 1; i++) {
			unsigned long val;

			a = m[i + 1];
			if (!a)
				continue;
			if (metric_name[i])
				fprintf(fp, " %s ", metric_name[i]);
			else
				fprintf(fp, " metric_%d ", i);

			val = rta_getattr_u32(a);
			switch (i) {
			case TCP_METRIC_RTT:
				fprintf(fp, "%luus", (val * 1000UL) >> 3);
				break;
			case TCP_METRIC_RTTVAR:
				fprintf(fp, "%luus", (val * 1000UL) >> 2);
				break;
			case TCP_METRIC_SSTHRESH:
			case TCP_METRIC_CWND:
			case TCP_METRIC_REORDERING:
			default:
				fprintf(fp, "%lu", val);
				break;
			}
		}
	}

	a = attrs[TCP_METRICS_ATTR_FOPEN_MSS];
	if (a)
		fprintf(fp, " fo_mss %u", rta_getattr_u16(a));

	a = attrs[TCP_METRICS_ATTR_FOPEN_SYN_DROPS];
	if (a) {
		__u16 syn_loss = rta_getattr_u16(a);
		unsigned long long ts;

		a = attrs[TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS];
		ts = a ? rta_getattr_u64(a) : 0;

		fprintf(fp, " fo_syn_drops %u/%llu.%03llusec ago",
			syn_loss, ts / 1000, ts % 1000);
	}

	a = attrs[TCP_METRICS_ATTR_FOPEN_COOKIE];
	if (a) {
		char cookie[32 + 1];
		unsigned char *ptr = RTA_DATA(a);
		int i, max = RTA_PAYLOAD(a);

		if (max > 16)
			max = 16;
		cookie[0] = 0;
		for (i = 0; i < max; i++)
			sprintf(cookie + i + i, "%02x", ptr[i]);
		fprintf(fp, " fo_cookie %s", cookie);
	}

	if (slen) {
		fprintf(fp, " source %s",
			format_host(family, slen, &saddr.data, abuf,
				    sizeof(abuf)));
	}

	fprintf(fp, "\n");

	fflush(fp);
	return 0;
}

static int tcpm_do_cmd(int cmd, int argc, char **argv)
{
	TCPM_REQUEST(req, 1024, TCP_METRICS_CMD_GET, NLM_F_REQUEST);
	int atype = -1;
	int ack;

	memset(&f, 0, sizeof(f));
	f.daddr.bitlen = -1;
	f.daddr.family = preferred_family;

	switch (preferred_family) {
	case AF_UNSPEC:
	case AF_INET:
	case AF_INET6:
		break;
	default:
		fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
		return -1;
	}

	for (; argc > 0; argc--, argv++) {
		char *who = "address";

		if (strcmp(*argv, "addr") == 0 ||
		    strcmp(*argv, "address") == 0) {
			who = *argv;
			NEXT_ARG();
		}
		if (matches(*argv, "help") == 0)
			usage();
		if (f.daddr.bitlen >= 0)
			duparg2(who, *argv);

		get_prefix(&f.daddr, *argv, preferred_family);
		if (f.daddr.bytelen && f.daddr.bytelen * 8 == f.daddr.bitlen) {
			if (f.daddr.family == AF_INET)
				atype = TCP_METRICS_ATTR_ADDR_IPV4;
			else if (f.daddr.family == AF_INET6)
				atype = TCP_METRICS_ATTR_ADDR_IPV6;
		}
		if ((CMD_DEL & cmd) && atype < 0) {
			fprintf(stderr, "Error: a specific IP address is expected rather than \"%s\"\n",
				*argv);
			return -1;
		}

		argc--; argv++;
	}

	if (cmd == CMD_DEL && atype < 0)
		missarg("address");

	/* flush for exact address ? Single del */
	if (cmd == CMD_FLUSH && atype >= 0)
		cmd = CMD_DEL;

	/* flush for all addresses ? Single del without address */
	if (cmd == CMD_FLUSH && f.daddr.bitlen <= 0 &&
	    preferred_family == AF_UNSPEC) {
		cmd = CMD_DEL;
		req.g.cmd = TCP_METRICS_CMD_DEL;
		ack = 1;
	} else if (cmd == CMD_DEL) {
		req.g.cmd = TCP_METRICS_CMD_DEL;
		ack = 1;
	} else {	/* CMD_FLUSH, CMD_LIST */
		ack = 0;
	}

	if (genl_family < 0) {
		if (rtnl_open_byproto(&grth, 0, NETLINK_GENERIC) < 0) {
			fprintf(stderr, "Cannot open generic netlink socket\n");
			exit(1);
		}
		genl_family = genl_resolve_family(&grth,
						  TCP_METRICS_GENL_NAME);
		if (genl_family < 0)
			exit(1);
		req.n.nlmsg_type = genl_family;
	}

	if (!(cmd & CMD_FLUSH) && (atype >= 0 || (cmd & CMD_DEL))) {
		if (ack)
			req.n.nlmsg_flags |= NLM_F_ACK;
		if (atype >= 0)
			addattr_l(&req.n, sizeof(req), atype, &f.daddr.data,
				  f.daddr.bytelen);
	} else {
		req.n.nlmsg_flags |= NLM_F_DUMP;
	}

	f.cmd = cmd;
	if (cmd & CMD_FLUSH) {
		int round = 0;
		char flushb[4096-512];

		f.flushb = flushb;
		f.flushp = 0;
		f.flushe = sizeof(flushb);

		for (;;) {
			req.n.nlmsg_seq = grth.dump = ++grth.seq;
			if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) {
				perror("Failed to send flush request");
				exit(1);
			}
			f.flushed = 0;
			if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) {
				fprintf(stderr, "Flush terminated\n");
				exit(1);
			}
			if (f.flushed == 0) {
				if (round == 0) {
					fprintf(stderr, "Nothing to flush.\n");
				} else if (show_stats)
					printf("*** Flush is complete after %d round%s ***\n",
					       round, round > 1 ? "s" : "");
				fflush(stdout);
				return 0;
			}
			round++;
			if (flush_update() < 0)
				exit(1);
			if (show_stats) {
				printf("\n*** Round %d, deleting %d entries ***\n",
				       round, f.flushed);
				fflush(stdout);
			}
		}
		return 0;
	}

	if (ack) {
		if (rtnl_talk(&grth, &req.n, 0, 0, NULL) < 0)
			return -2;
	} else if (atype >= 0) {
		if (rtnl_talk(&grth, &req.n, 0, 0, &req.n) < 0)
			return -2;
		if (process_msg(NULL, &req.n, stdout) < 0) {
			fprintf(stderr, "Dump terminated\n");
			exit(1);
		}
	} else {
		req.n.nlmsg_seq = grth.dump = ++grth.seq;
		if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) {
			perror("Failed to send dump request");
			exit(1);
		}

		if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) {
			fprintf(stderr, "Dump terminated\n");
			exit(1);
		}
	}
	return 0;
}

int do_tcp_metrics(int argc, char **argv)
{
	int i;

	if (argc < 1)
		return tcpm_do_cmd(CMD_LIST, 0, NULL);
	for (i = 0; i < ARRAY_SIZE(cmds); i++) {
		if (matches(argv[0], cmds[i].name) == 0)
			return tcpm_do_cmd(cmds[i].code, argc-1, argv+1);
	}
	if (matches(argv[0], "help") == 0)
		usage();

	fprintf(stderr, "Command \"%s\" is unknown, "
			"try \"ip tcp_metrics help\".\n", *argv);
	exit(-1);
}
Commit	Line	Data
ea63a69b JA	1	/*
	2	* tcp_metrics.c "ip tcp_metrics/tcpmetrics"
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* version 2 as published by the Free Software Foundation;
	7	*
	8	* Authors: Julian Anastasov <ja@ssi.bg>, August 2012
	9	*/
	10
	11	#include <stdio.h>
	12	#include <stdlib.h>
	13	#include <string.h>
	14	#include <unistd.h>
	15	#include <errno.h>
	16	#include <sys/types.h>
	17	#include <sys/socket.h>
	18	#include <arpa/inet.h>
	19	#include <sys/ioctl.h>
	20	#include <linux/if.h>
	21
	22	#include <linux/genetlink.h>
	23	#include <linux/tcp_metrics.h>
	24
	25	#include "utils.h"
	26	#include "ip_common.h"
	27	#include "libgenl.h"
	28
	29	static void usage(void)
	30	{
	31	fprintf(stderr, "Usage: ip tcp_metrics/tcpmetrics { COMMAND \| help }\n");
	32	fprintf(stderr, " ip tcp_metrics { show \| flush } SELECTOR\n");
	33	fprintf(stderr, " ip tcp_metrics delete [ address ] ADDRESS\n");
	34	fprintf(stderr, "SELECTOR := [ [ address ] PREFIX ]\n");
	35	exit(-1);
	36	}
	37
	38	/* netlink socket */
	39	static struct rtnl_handle grth = { .fd = -1 };
	40	static int genl_family = -1;
	41
	42	#define TCPM_REQUEST(_req, _bufsiz, _cmd, _flags) \
	43	GENL_REQUEST(_req, _bufsiz, genl_family, 0, \
	44	TCP_METRICS_GENL_VERSION, _cmd, _flags)
	45
	46	#define CMD_LIST 0x0001 /* list, lst, show */
	47	#define CMD_DEL 0x0002 /* delete, remove */
	48	#define CMD_FLUSH 0x0004 /* flush */
	49
	50	static struct {
	51	char *name;
	52	int code;
	53	} cmds[] = {
	54	{ "list", CMD_LIST },
	55	{ "lst", CMD_LIST },
	56	{ "show", CMD_LIST },
	57	{ "delete", CMD_DEL },
	58	{ "remove", CMD_DEL },
	59	{ "flush", CMD_FLUSH },
	60	};
	61
	62	static char *metric_name[TCP_METRIC_MAX + 1] = {
	63	[TCP_METRIC_RTT] = "rtt",
	64	[TCP_METRIC_RTTVAR] = "rttvar",
65	[TCP_METRIC_SSTHRESH] = "ssthresh",
66	[TCP_METRIC_CWND] = "cwnd",
67	[TCP_METRIC_REORDERING] = "reordering",
68	};
69
70	static struct
71	{
72	int flushed;
73	char *flushb;
74	int flushp;
75	int flushe;
76	int cmd;
54b237a0	77	inet_prefix daddr;
ea63a69b JA	78	} f;
	79
	80	static int flush_update(void)
	81	{
	82	if (rtnl_send_check(&grth, f.flushb, f.flushp) < 0) {
	83	perror("Failed to send flush request\n");
	84	return -1;
	85	}
	86	f.flushp = 0;
	87	return 0;
	88	}
	89
	90	static int process_msg(const struct sockaddr_nl who, struct nlmsghdr n,
	91	void *arg)
	92	{
	93	FILE fp = (FILE ) arg;
	94	struct genlmsghdr *ghdr;
	95	struct rtattr attrs[TCP_METRICS_ATTR_MAX + 1], a;
	96	int len = n->nlmsg_len;
	97	char abuf[256];
114aa720 CP	98	inet_prefix daddr, saddr;
114aa720 CP	99	int family, i, atype, stype, dlen = 0, slen = 0;
ea63a69b JA	100
	101	if (n->nlmsg_type != genl_family)
	102	return -1;
	103
	104	len -= NLMSG_LENGTH(GENL_HDRLEN);
	105	if (len < 0)
	106	return -1;
	107
	108	ghdr = NLMSG_DATA(n);
	109	if (ghdr->cmd != TCP_METRICS_CMD_GET)
	110	return 0;
	111
	112	parse_rtattr(attrs, TCP_METRICS_ATTR_MAX, (void *) ghdr + GENL_HDRLEN,
	113	len);
	114
	115	a = attrs[TCP_METRICS_ATTR_ADDR_IPV4];
	116	if (a) {
54b237a0	117	if (f.daddr.family && f.daddr.family != AF_INET)
ea63a69b	118	return 0;
54b237a0 CP	119	memcpy(&daddr.data, RTA_DATA(a), 4);
54b237a0 CP	120	daddr.bytelen = 4;
ea63a69b JA	121	family = AF_INET;
ea63a69b JA	122	atype = TCP_METRICS_ATTR_ADDR_IPV4;
54b237a0	123	dlen = RTA_PAYLOAD(a);
ea63a69b JA	124	} else {
	125	a = attrs[TCP_METRICS_ATTR_ADDR_IPV6];
	126	if (a) {
54b237a0	127	if (f.daddr.family && f.daddr.family != AF_INET6)
ea63a69b	128	return 0;
54b237a0 CP	129	memcpy(&daddr.data, RTA_DATA(a), 16);
54b237a0 CP	130	daddr.bytelen = 16;
ea63a69b JA	131	family = AF_INET6;
ea63a69b JA	132	atype = TCP_METRICS_ATTR_ADDR_IPV6;
54b237a0	133	dlen = RTA_PAYLOAD(a);
ea63a69b JA	134	} else
	135	return 0;
	136	}
	137
114aa720 CP	138	a = attrs[TCP_METRICS_ATTR_SADDR_IPV4];
	139	if (a) {
	140	if (f.saddr.family && f.saddr.family != AF_INET)
	141	return 0;
	142	memcpy(&saddr.data, RTA_DATA(a), 4);
	143	saddr.bytelen = 4;
	144	stype = TCP_METRICS_ATTR_SADDR_IPV4;
	145	slen = RTA_PAYLOAD(a);
	146	} else {
	147	a = attrs[TCP_METRICS_ATTR_SADDR_IPV6];
	148	if (a) {
	149	if (f.saddr.family && f.saddr.family != AF_INET6)
	150	return 0;
	151	memcpy(&saddr.data, RTA_DATA(a), 16);
	152	saddr.bytelen = 16;
	153	stype = TCP_METRICS_ATTR_SADDR_IPV6;
	154	slen = RTA_PAYLOAD(a);
	155	}
	156	}
	157
54b237a0 CP	158	if (f.daddr.family && f.daddr.bitlen >= 0 &&
54b237a0 CP	159	inet_addr_match(&daddr, &f.daddr, f.daddr.bitlen))
ea63a69b JA	160	return 0;
	161
	162	if (f.flushb) {
	163	struct nlmsghdr *fn;
	164	TCPM_REQUEST(req2, 128, TCP_METRICS_CMD_DEL, NLM_F_REQUEST);
	165
54b237a0 CP	166	addattr_l(&req2.n, sizeof(req2), atype, &daddr.data,
54b237a0 CP	167	daddr.bytelen);
ea63a69b JA	168
	169	if (NLMSG_ALIGN(f.flushp) + req2.n.nlmsg_len > f.flushe) {
	170	if (flush_update())
	171	return -1;
	172	}
	173	fn = (struct nlmsghdr *) (f.flushb + NLMSG_ALIGN(f.flushp));
	174	memcpy(fn, &req2.n, req2.n.nlmsg_len);
	175	fn->nlmsg_seq = ++grth.seq;
	176	f.flushp = (((char *) fn) + req2.n.nlmsg_len) - f.flushb;
	177	f.flushed++;
	178	if (show_stats < 2)
	179	return 0;
	180	}
	181
	182	if (f.cmd & (CMD_DEL \| CMD_FLUSH))
	183	fprintf(fp, "Deleted ");
	184
	185	fprintf(fp, "%s",
54b237a0	186	format_host(family, dlen, &daddr.data, abuf, sizeof(abuf)));
ea63a69b JA	187
	188	a = attrs[TCP_METRICS_ATTR_AGE];
	189	if (a) {
a55a8fd8	190	unsigned long long val = rta_getattr_u64(a);
ea63a69b JA	191
	192	fprintf(fp, " age %llu.%03llusec",
	193	val / 1000, val % 1000);
	194	}
	195
	196	a = attrs[TCP_METRICS_ATTR_TW_TS_STAMP];
	197	if (a) {
	198	__s32 val = (__s32) rta_getattr_u32(a);
	199	__u32 tsval;
	200
	201	a = attrs[TCP_METRICS_ATTR_TW_TSVAL];
	202	tsval = a ? rta_getattr_u32(a) : 0;
	203	fprintf(fp, " tw_ts %u/%dsec ago", tsval, val);
	204	}
	205
	206	a = attrs[TCP_METRICS_ATTR_VALS];
	207	if (a) {
	208	struct rtattr *m[TCP_METRIC_MAX + 1 + 1];
	209
	210	parse_rtattr_nested(m, TCP_METRIC_MAX + 1, a);
	211
	212	for (i = 0; i < TCP_METRIC_MAX + 1; i++) {
a55a8fd8	213	unsigned long val;
ea63a69b JA	214
	215	a = m[i + 1];
	216	if (!a)
	217	continue;
	218	if (metric_name[i])
	219	fprintf(fp, " %s ", metric_name[i]);
	220	else
	221	fprintf(fp, " metric_%d ", i);
a55a8fd8	222
ea63a69b JA	223	val = rta_getattr_u32(a);
	224	switch (i) {
	225	case TCP_METRIC_RTT:
a55a8fd8	226	fprintf(fp, "%luus", (val * 1000UL) >> 3);
ea63a69b JA	227	break;
ea63a69b JA	228	case TCP_METRIC_RTTVAR:
a55a8fd8	229	fprintf(fp, "%luus", (val * 1000UL) >> 2);
ea63a69b JA	230	break;
	231	case TCP_METRIC_SSTHRESH:
	232	case TCP_METRIC_CWND:
	233	case TCP_METRIC_REORDERING:
	234	default:
a55a8fd8	235	fprintf(fp, "%lu", val);
ea63a69b JA	236	break;
	237	}
	238	}
	239	}
	240
	241	a = attrs[TCP_METRICS_ATTR_FOPEN_MSS];
	242	if (a)
	243	fprintf(fp, " fo_mss %u", rta_getattr_u16(a));
	244
	245	a = attrs[TCP_METRICS_ATTR_FOPEN_SYN_DROPS];
	246	if (a) {
	247	__u16 syn_loss = rta_getattr_u16(a);
a55a8fd8	248	unsigned long long ts;
ea63a69b JA	249
	250	a = attrs[TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS];
	251	ts = a ? rta_getattr_u64(a) : 0;
	252
	253	fprintf(fp, " fo_syn_drops %u/%llu.%03llusec ago",
	254	syn_loss, ts / 1000, ts % 1000);
	255	}
	256
	257	a = attrs[TCP_METRICS_ATTR_FOPEN_COOKIE];
	258	if (a) {
	259	char cookie[32 + 1];
	260	unsigned char *ptr = RTA_DATA(a);
	261	int i, max = RTA_PAYLOAD(a);
	262
	263	if (max > 16)
	264	max = 16;
	265	cookie[0] = 0;
	266	for (i = 0; i < max; i++)
	267	sprintf(cookie + i + i, "%02x", ptr[i]);
	268	fprintf(fp, " fo_cookie %s", cookie);
	269	}
	270
114aa720 CP	271	if (slen) {
	272	fprintf(fp, " source %s",
	273	format_host(family, slen, &saddr.data, abuf,
	274	sizeof(abuf)));
	275	}
	276
ea63a69b JA	277	fprintf(fp, "\n");
	278
	279	fflush(fp);
	280	return 0;
	281	}
	282
	283	static int tcpm_do_cmd(int cmd, int argc, char **argv)
	284	{
	285	TCPM_REQUEST(req, 1024, TCP_METRICS_CMD_GET, NLM_F_REQUEST);
	286	int atype = -1;
	287	int ack;
	288
	289	memset(&f, 0, sizeof(f));
54b237a0 CP	290	f.daddr.bitlen = -1;
54b237a0 CP	291	f.daddr.family = preferred_family;
ea63a69b JA	292
	293	switch (preferred_family) {
	294	case AF_UNSPEC:
	295	case AF_INET:
	296	case AF_INET6:
	297	break;
	298	default:
14645ec2	299	fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
ea63a69b JA	300	return -1;
	301	}
	302
	303	for (; argc > 0; argc--, argv++) {
	304	char *who = "address";
	305
	306	if (strcmp(*argv, "addr") == 0 \|\|
	307	strcmp(*argv, "address") == 0) {
	308	who = *argv;
	309	NEXT_ARG();
	310	}
	311	if (matches(*argv, "help") == 0)
	312	usage();
54b237a0	313	if (f.daddr.bitlen >= 0)
ea63a69b JA	314	duparg2(who, *argv);
ea63a69b JA	315
54b237a0 CP	316	get_prefix(&f.daddr, *argv, preferred_family);
	317	if (f.daddr.bytelen && f.daddr.bytelen * 8 == f.daddr.bitlen) {
	318	if (f.daddr.family == AF_INET)
ea63a69b	319	atype = TCP_METRICS_ATTR_ADDR_IPV4;
54b237a0	320	else if (f.daddr.family == AF_INET6)
ea63a69b JA	321	atype = TCP_METRICS_ATTR_ADDR_IPV6;
	322	}
	323	if ((CMD_DEL & cmd) && atype < 0) {
	324	fprintf(stderr, "Error: a specific IP address is expected rather than \"%s\"\n",
	325	*argv);
	326	return -1;
	327	}
	328
	329	argc--; argv++;
	330	}
	331
	332	if (cmd == CMD_DEL && atype < 0)
	333	missarg("address");
	334
	335	/* flush for exact address ? Single del */
	336	if (cmd == CMD_FLUSH && atype >= 0)
	337	cmd = CMD_DEL;
	338
	339	/* flush for all addresses ? Single del without address */
54b237a0	340	if (cmd == CMD_FLUSH && f.daddr.bitlen <= 0 &&
ea63a69b JA	341	preferred_family == AF_UNSPEC) {
	342	cmd = CMD_DEL;
	343	req.g.cmd = TCP_METRICS_CMD_DEL;
	344	ack = 1;
	345	} else if (cmd == CMD_DEL) {
	346	req.g.cmd = TCP_METRICS_CMD_DEL;
	347	ack = 1;
	348	} else { /* CMD_FLUSH, CMD_LIST */
	349	ack = 0;
	350	}
	351
	352	if (genl_family < 0) {
	353	if (rtnl_open_byproto(&grth, 0, NETLINK_GENERIC) < 0) {
	354	fprintf(stderr, "Cannot open generic netlink socket\n");
	355	exit(1);
	356	}
	357	genl_family = genl_resolve_family(&grth,
	358	TCP_METRICS_GENL_NAME);
	359	if (genl_family < 0)
	360	exit(1);
	361	req.n.nlmsg_type = genl_family;
	362	}
	363
	364	if (!(cmd & CMD_FLUSH) && (atype >= 0 \|\| (cmd & CMD_DEL))) {
	365	if (ack)
	366	req.n.nlmsg_flags \|= NLM_F_ACK;
	367	if (atype >= 0)
54b237a0 CP	368	addattr_l(&req.n, sizeof(req), atype, &f.daddr.data,
54b237a0 CP	369	f.daddr.bytelen);
ea63a69b JA	370	} else {
	371	req.n.nlmsg_flags \|= NLM_F_DUMP;
	372	}
	373
	374	f.cmd = cmd;
	375	if (cmd & CMD_FLUSH) {
	376	int round = 0;
	377	char flushb[4096-512];
	378
	379	f.flushb = flushb;
	380	f.flushp = 0;
	381	f.flushe = sizeof(flushb);
	382
	383	for (;;) {
	384	req.n.nlmsg_seq = grth.dump = ++grth.seq;
	385	if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) {
	386	perror("Failed to send flush request");
	387	exit(1);
	388	}
	389	f.flushed = 0;
	390	if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) {
	391	fprintf(stderr, "Flush terminated\n");
	392	exit(1);
	393	}
	394	if (f.flushed == 0) {
	395	if (round == 0) {
	396	fprintf(stderr, "Nothing to flush.\n");
	397	} else if (show_stats)
	398	printf("* Flush is complete after %d round%s *\n",
	399	round, round > 1 ? "s" : "");
	400	fflush(stdout);
	401	return 0;
	402	}
	403	round++;
	404	if (flush_update() < 0)
	405	exit(1);
	406	if (show_stats) {
	407	printf("\n* Round %d, deleting %d entries *\n",
	408	round, f.flushed);
	409	fflush(stdout);
	410	}
	411	}
	412	return 0;
	413	}
	414
	415	if (ack) {
	416	if (rtnl_talk(&grth, &req.n, 0, 0, NULL) < 0)
	417	return -2;
	418	} else if (atype >= 0) {
	419	if (rtnl_talk(&grth, &req.n, 0, 0, &req.n) < 0)
	420	return -2;
	421	if (process_msg(NULL, &req.n, stdout) < 0) {
	422	fprintf(stderr, "Dump terminated\n");
	423	exit(1);
	424	}
	425	} else {
	426	req.n.nlmsg_seq = grth.dump = ++grth.seq;
	427	if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) {
	428	perror("Failed to send dump request");
	429	exit(1);
	430	}
	431
	432	if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) {
	433	fprintf(stderr, "Dump terminated\n");
434	exit(1);
435	}
436	}
437	return 0;
438	}
439
440	int do_tcp_metrics(int argc, char **argv)
441	{
442	int i;
443
444	if (argc < 1)
445	return tcpm_do_cmd(CMD_LIST, 0, NULL);
446	for (i = 0; i < ARRAY_SIZE(cmds); i++) {
447	if (matches(argv[0], cmds[i].name) == 0)
448	return tcpm_do_cmd(cmds[i].code, argc-1, argv+1);
449	}
450	if (matches(argv[0], "help") == 0)
451	usage();
452
453	fprintf(stderr, "Command \"%s\" is unknown, "
454	"try \"ip tcp_metrics help\".\n", *argv);
455	exit(-1);
456	}
457