[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 addr;
} 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 addr;
	int family, i, atype;

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

	if (f.addr.family && f.addr.bitlen >= 0 &&
	    inet_addr_match(&addr, &f.addr, f.addr.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, &addr.data,
			  addr.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, RTA_PAYLOAD(a), &addr.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);
	}

	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.addr.bitlen = -1;
	f.addr.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.addr.bitlen >= 0)
			duparg2(who, *argv);

		get_prefix(&f.addr, *argv, preferred_family);
		if (f.addr.bytelen && f.addr.bytelen * 8 == f.addr.bitlen) {
			if (f.addr.family == AF_INET)
				atype = TCP_METRICS_ATTR_ADDR_IPV4;
			else if (f.addr.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.addr.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.addr.data,
				  f.addr.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;
77	inet_prefix addr;
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];
98	inet_prefix addr;
99	int family, i, atype;
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) {
117	if (f.addr.family && f.addr.family != AF_INET)
118	return 0;
119	memcpy(&addr.data, RTA_DATA(a), 4);
120	addr.bytelen = 4;
121	family = AF_INET;
122	atype = TCP_METRICS_ATTR_ADDR_IPV4;
123	} else {
124	a = attrs[TCP_METRICS_ATTR_ADDR_IPV6];
125	if (a) {
126	if (f.addr.family && f.addr.family != AF_INET6)
127	return 0;
128	memcpy(&addr.data, RTA_DATA(a), 16);
129	addr.bytelen = 16;
130	family = AF_INET6;
131	atype = TCP_METRICS_ATTR_ADDR_IPV6;
132	} else
133	return 0;
134	}
135
136	if (f.addr.family && f.addr.bitlen >= 0 &&
137	inet_addr_match(&addr, &f.addr, f.addr.bitlen))
138	return 0;
139
140	if (f.flushb) {
141	struct nlmsghdr *fn;
142	TCPM_REQUEST(req2, 128, TCP_METRICS_CMD_DEL, NLM_F_REQUEST);
143
144	addattr_l(&req2.n, sizeof(req2), atype, &addr.data,
145	addr.bytelen);
146
147	if (NLMSG_ALIGN(f.flushp) + req2.n.nlmsg_len > f.flushe) {
148	if (flush_update())
149	return -1;
150	}
151	fn = (struct nlmsghdr *) (f.flushb + NLMSG_ALIGN(f.flushp));
152	memcpy(fn, &req2.n, req2.n.nlmsg_len);
153	fn->nlmsg_seq = ++grth.seq;
154	f.flushp = (((char *) fn) + req2.n.nlmsg_len) - f.flushb;
155	f.flushed++;
156	if (show_stats < 2)
157	return 0;
158	}
159
160	if (f.cmd & (CMD_DEL \| CMD_FLUSH))
161	fprintf(fp, "Deleted ");
162
163	fprintf(fp, "%s",
164	format_host(family, RTA_PAYLOAD(a), &addr.data,
165	abuf, sizeof(abuf)));
166
167	a = attrs[TCP_METRICS_ATTR_AGE];
168	if (a) {
a55a8fd8	169	unsigned long long val = rta_getattr_u64(a);
ea63a69b JA	170
	171	fprintf(fp, " age %llu.%03llusec",
	172	val / 1000, val % 1000);
	173	}
	174
	175	a = attrs[TCP_METRICS_ATTR_TW_TS_STAMP];
	176	if (a) {
	177	__s32 val = (__s32) rta_getattr_u32(a);
	178	__u32 tsval;
	179
	180	a = attrs[TCP_METRICS_ATTR_TW_TSVAL];
	181	tsval = a ? rta_getattr_u32(a) : 0;
	182	fprintf(fp, " tw_ts %u/%dsec ago", tsval, val);
	183	}
	184
	185	a = attrs[TCP_METRICS_ATTR_VALS];
	186	if (a) {
	187	struct rtattr *m[TCP_METRIC_MAX + 1 + 1];
	188
	189	parse_rtattr_nested(m, TCP_METRIC_MAX + 1, a);
	190
	191	for (i = 0; i < TCP_METRIC_MAX + 1; i++) {
a55a8fd8	192	unsigned long val;
ea63a69b JA	193
	194	a = m[i + 1];
	195	if (!a)
	196	continue;
	197	if (metric_name[i])
	198	fprintf(fp, " %s ", metric_name[i]);
	199	else
	200	fprintf(fp, " metric_%d ", i);
a55a8fd8	201
ea63a69b JA	202	val = rta_getattr_u32(a);
	203	switch (i) {
	204	case TCP_METRIC_RTT:
a55a8fd8	205	fprintf(fp, "%luus", (val * 1000UL) >> 3);
ea63a69b JA	206	break;
ea63a69b JA	207	case TCP_METRIC_RTTVAR:
a55a8fd8	208	fprintf(fp, "%luus", (val * 1000UL) >> 2);
ea63a69b JA	209	break;
	210	case TCP_METRIC_SSTHRESH:
	211	case TCP_METRIC_CWND:
	212	case TCP_METRIC_REORDERING:
	213	default:
a55a8fd8	214	fprintf(fp, "%lu", val);
ea63a69b JA	215	break;
	216	}
	217	}
	218	}
	219
	220	a = attrs[TCP_METRICS_ATTR_FOPEN_MSS];
	221	if (a)
	222	fprintf(fp, " fo_mss %u", rta_getattr_u16(a));
	223
	224	a = attrs[TCP_METRICS_ATTR_FOPEN_SYN_DROPS];
	225	if (a) {
	226	__u16 syn_loss = rta_getattr_u16(a);
a55a8fd8	227	unsigned long long ts;
ea63a69b JA	228
	229	a = attrs[TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS];
	230	ts = a ? rta_getattr_u64(a) : 0;
	231
	232	fprintf(fp, " fo_syn_drops %u/%llu.%03llusec ago",
	233	syn_loss, ts / 1000, ts % 1000);
	234	}
	235
	236	a = attrs[TCP_METRICS_ATTR_FOPEN_COOKIE];
	237	if (a) {
	238	char cookie[32 + 1];
	239	unsigned char *ptr = RTA_DATA(a);
	240	int i, max = RTA_PAYLOAD(a);
	241
	242	if (max > 16)
	243	max = 16;
	244	cookie[0] = 0;
	245	for (i = 0; i < max; i++)
	246	sprintf(cookie + i + i, "%02x", ptr[i]);
	247	fprintf(fp, " fo_cookie %s", cookie);
	248	}
	249
	250	fprintf(fp, "\n");
	251
	252	fflush(fp);
	253	return 0;
	254	}
	255
	256	static int tcpm_do_cmd(int cmd, int argc, char **argv)
	257	{
	258	TCPM_REQUEST(req, 1024, TCP_METRICS_CMD_GET, NLM_F_REQUEST);
	259	int atype = -1;
	260	int ack;
	261
	262	memset(&f, 0, sizeof(f));
	263	f.addr.bitlen = -1;
	264	f.addr.family = preferred_family;
	265
	266	switch (preferred_family) {
	267	case AF_UNSPEC:
	268	case AF_INET:
	269	case AF_INET6:
	270	break;
	271	default:
14645ec2	272	fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
ea63a69b JA	273	return -1;
	274	}
	275
	276	for (; argc > 0; argc--, argv++) {
	277	char *who = "address";
	278
	279	if (strcmp(*argv, "addr") == 0 \|\|
	280	strcmp(*argv, "address") == 0) {
	281	who = *argv;
	282	NEXT_ARG();
	283	}
	284	if (matches(*argv, "help") == 0)
	285	usage();
	286	if (f.addr.bitlen >= 0)
	287	duparg2(who, *argv);
	288
	289	get_prefix(&f.addr, *argv, preferred_family);
	290	if (f.addr.bytelen && f.addr.bytelen * 8 == f.addr.bitlen) {
	291	if (f.addr.family == AF_INET)
	292	atype = TCP_METRICS_ATTR_ADDR_IPV4;
	293	else if (f.addr.family == AF_INET6)
	294	atype = TCP_METRICS_ATTR_ADDR_IPV6;
	295	}
	296	if ((CMD_DEL & cmd) && atype < 0) {
	297	fprintf(stderr, "Error: a specific IP address is expected rather than \"%s\"\n",
	298	*argv);
	299	return -1;
	300	}
	301
	302	argc--; argv++;
	303	}
	304
	305	if (cmd == CMD_DEL && atype < 0)
	306	missarg("address");
	307
	308	/* flush for exact address ? Single del */
	309	if (cmd == CMD_FLUSH && atype >= 0)
	310	cmd = CMD_DEL;
	311
	312	/* flush for all addresses ? Single del without address */
	313	if (cmd == CMD_FLUSH && f.addr.bitlen <= 0 &&
	314	preferred_family == AF_UNSPEC) {
	315	cmd = CMD_DEL;
	316	req.g.cmd = TCP_METRICS_CMD_DEL;
	317	ack = 1;
	318	} else if (cmd == CMD_DEL) {
	319	req.g.cmd = TCP_METRICS_CMD_DEL;
	320	ack = 1;
	321	} else { /* CMD_FLUSH, CMD_LIST */
	322	ack = 0;
	323	}
	324
	325	if (genl_family < 0) {
	326	if (rtnl_open_byproto(&grth, 0, NETLINK_GENERIC) < 0) {
	327	fprintf(stderr, "Cannot open generic netlink socket\n");
	328	exit(1);
	329	}
	330	genl_family = genl_resolve_family(&grth,
	331	TCP_METRICS_GENL_NAME);
	332	if (genl_family < 0)
	333	exit(1);
	334	req.n.nlmsg_type = genl_family;
	335	}
	336
337	if (!(cmd & CMD_FLUSH) && (atype >= 0 \|\| (cmd & CMD_DEL))) {
338	if (ack)
339	req.n.nlmsg_flags \|= NLM_F_ACK;
340	if (atype >= 0)
341	addattr_l(&req.n, sizeof(req), atype, &f.addr.data,
342	f.addr.bytelen);
343	} else {
344	req.n.nlmsg_flags \|= NLM_F_DUMP;
345	}
346
347	f.cmd = cmd;
348	if (cmd & CMD_FLUSH) {
349	int round = 0;
350	char flushb[4096-512];
351
352	f.flushb = flushb;
353	f.flushp = 0;
354	f.flushe = sizeof(flushb);
355
356	for (;;) {
357	req.n.nlmsg_seq = grth.dump = ++grth.seq;
358	if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) {
359	perror("Failed to send flush request");
360	exit(1);
361	}
362	f.flushed = 0;
363	if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) {
364	fprintf(stderr, "Flush terminated\n");
365	exit(1);
366	}
367	if (f.flushed == 0) {
368	if (round == 0) {
369	fprintf(stderr, "Nothing to flush.\n");
370	} else if (show_stats)
371	printf("* Flush is complete after %d round%s *\n",
372	round, round > 1 ? "s" : "");
373	fflush(stdout);
374	return 0;
375	}
376	round++;
377	if (flush_update() < 0)
378	exit(1);
379	if (show_stats) {
380	printf("\n* Round %d, deleting %d entries *\n",
381	round, f.flushed);
382	fflush(stdout);
383	}
384	}
385	return 0;
386	}
387
388	if (ack) {
389	if (rtnl_talk(&grth, &req.n, 0, 0, NULL) < 0)
390	return -2;
391	} else if (atype >= 0) {
392	if (rtnl_talk(&grth, &req.n, 0, 0, &req.n) < 0)
393	return -2;
394	if (process_msg(NULL, &req.n, stdout) < 0) {
395	fprintf(stderr, "Dump terminated\n");
396	exit(1);
397	}
398	} else {
399	req.n.nlmsg_seq = grth.dump = ++grth.seq;
400	if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) {
401	perror("Failed to send dump request");
402	exit(1);
403	}
404
405	if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) {
406	fprintf(stderr, "Dump terminated\n");
407	exit(1);
408	}
409	}
410	return 0;
411	}
412
413	int do_tcp_metrics(int argc, char **argv)
414	{
415	int i;
416
417	if (argc < 1)
418	return tcpm_do_cmd(CMD_LIST, 0, NULL);
419	for (i = 0; i < ARRAY_SIZE(cmds); i++) {
420	if (matches(argv[0], cmds[i].name) == 0)
421	return tcpm_do_cmd(cmds[i].code, argc-1, argv+1);
422	}
423	if (matches(argv[0], "help") == 0)
424	usage();
425
426	fprintf(stderr, "Command \"%s\" is unknown, "
427	"try \"ip tcp_metrics help\".\n", *argv);
428	exit(-1);
429	}
430