Blame tc/m_sample.c

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/*
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 * m_sample.c		ingress/egress packet sampling module
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 *
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 *		This program is free software; you can distribute it and/or
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 *		modify it under the terms of the GNU General Public License
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 *		as published by the Free Software Foundation; either version
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 *		2 of the License, or (at your option) any later version.
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 *
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 * Authors:	Yotam Gigi <yotamg@mellanox.com>
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 *
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 */
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#include <stdio.h>
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#include "utils.h"
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#include "tc_util.h"
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#include "tc_common.h"
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#include <linux/tc_act/tc_sample.h>
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static void explain(void)
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{
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	fprintf(stderr,
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		"Usage: sample SAMPLE_CONF\n"
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		"where:\n"
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		"\tSAMPLE_CONF := SAMPLE_PARAMS | SAMPLE_INDEX\n"
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		"\tSAMPLE_PARAMS := rate RATE group GROUP [trunc SIZE] [SAMPLE_INDEX]\n"
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		"\tSAMPLE_INDEX := index INDEX\n"
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		"\tRATE := The ratio of packets observed at the data source to the samples generated.\n"
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		"\tGROUP := the psample sampling group\n"
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		"\tSIZE := the truncation size\n"
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		"\tINDEX := integer index of the sample action\n");
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}
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static void usage(void)
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{
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	explain();
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	exit(-1);
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}
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static int parse_sample(struct action_util *a, int *argc_p, char ***argv_p,
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			int tca_id, struct nlmsghdr *n)
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{
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	struct tc_sample p = { 0 };
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	bool trunc_set = false;
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	bool group_set = false;
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	bool rate_set = false;
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	char **argv = *argv_p;
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	struct rtattr *tail;
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	int argc = *argc_p;
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	__u32 trunc;
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	__u32 group;
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	__u32 rate;
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	if (argc <= 1) {
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		fprintf(stderr, "sample bad argument count %d\n", argc);
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		usage();
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		return -1;
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	}
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	if (matches(*argv, "sample") == 0) {
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		NEXT_ARG();
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	} else {
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		fprintf(stderr, "sample bad argument %s\n", *argv);
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		return -1;
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	}
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	while (argc > 0) {
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		if (matches(*argv, "rate") == 0) {
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			NEXT_ARG();
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			if (get_u32(&rate, *argv, 10) != 0) {
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				fprintf(stderr, "Illegal rate %s\n", *argv);
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				usage();
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				return -1;
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			}
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			rate_set = true;
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		} else if (matches(*argv, "group") == 0) {
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			NEXT_ARG();
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			if (get_u32(&group, *argv, 10) != 0) {
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				fprintf(stderr, "Illegal group num %s\n",
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					*argv);
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				usage();
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				return -1;
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			}
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			group_set = true;
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		} else if (matches(*argv, "trunc") == 0) {
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			NEXT_ARG();
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			if (get_u32(&trunc, *argv, 10) != 0) {
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				fprintf(stderr, "Illegal truncation size %s\n",
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					*argv);
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				usage();
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				return -1;
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			}
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			trunc_set = true;
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		} else if (matches(*argv, "help") == 0) {
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			usage();
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		} else {
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			break;
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		}
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		NEXT_ARG_FWD();
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	}
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	parse_action_control_dflt(&argc, &argv, &p.action, false, TC_ACT_PIPE);
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	if (argc) {
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		if (matches(*argv, "index") == 0) {
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			NEXT_ARG();
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			if (get_u32(&p.index, *argv, 10)) {
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				fprintf(stderr, "sample: Illegal \"index\"\n");
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				return -1;
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			}
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			NEXT_ARG_FWD();
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		}
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	}
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	if (!p.index && !group_set) {
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		fprintf(stderr, "param \"group\" not set\n");
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		usage();
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	}
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	if (!p.index && !rate_set) {
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		fprintf(stderr, "param \"rate\" not set\n");
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		usage();
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	}
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	tail = addattr_nest(n, MAX_MSG, tca_id);
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	addattr_l(n, MAX_MSG, TCA_SAMPLE_PARMS, &p, sizeof(p));
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	if (rate_set)
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		addattr32(n, MAX_MSG, TCA_SAMPLE_RATE, rate);
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	if (group_set)
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		addattr32(n, MAX_MSG, TCA_SAMPLE_PSAMPLE_GROUP, group);
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	if (trunc_set)
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		addattr32(n, MAX_MSG, TCA_SAMPLE_TRUNC_SIZE, trunc);
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	addattr_nest_end(n, tail);
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	*argc_p = argc;
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	*argv_p = argv;
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	return 0;
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}
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static int print_sample(struct action_util *au, FILE *f, struct rtattr *arg)
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{
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	struct rtattr *tb[TCA_SAMPLE_MAX + 1];
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	struct tc_sample *p;
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	if (arg == NULL)
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		return -1;
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	parse_rtattr_nested(tb, TCA_SAMPLE_MAX, arg);
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	if (!tb[TCA_SAMPLE_PARMS] || !tb[TCA_SAMPLE_RATE] ||
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	    !tb[TCA_SAMPLE_PSAMPLE_GROUP]) {
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		fprintf(stderr, "Missing sample parameters\n");
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		return -1;
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	}
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	p = RTA_DATA(tb[TCA_SAMPLE_PARMS]);
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	print_string(PRINT_ANY, "kind", "%s ", "sample");
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	print_uint(PRINT_ANY, "rate", "rate 1/%u ",
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		   rta_getattr_u32(tb[TCA_SAMPLE_RATE]));
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	print_uint(PRINT_ANY, "group", "group %u",
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		   rta_getattr_u32(tb[TCA_SAMPLE_PSAMPLE_GROUP]));
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	if (tb[TCA_SAMPLE_TRUNC_SIZE])
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		print_uint(PRINT_ANY, "trunc_size", " trunc_size %u",
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			   rta_getattr_u32(tb[TCA_SAMPLE_TRUNC_SIZE]));
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	print_action_control(f, " ", p->action, "");
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	print_nl();
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	print_uint(PRINT_ANY, "index", "\t index %u", p->index);
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	print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
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	print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
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	if (show_stats) {
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		if (tb[TCA_SAMPLE_TM]) {
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			struct tcf_t *tm = RTA_DATA(tb[TCA_SAMPLE_TM]);
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			print_tm(f, tm);
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		}
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	}
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	print_nl();
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	return 0;
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}
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struct action_util sample_action_util = {
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	.id = "sample",
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	.parse_aopt = parse_sample,
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	.print_aopt = print_sample,
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};