[mirror_iproute2.git] / tc / m_simple.c

/*
 * m_simple.c	simple action
 *
 *		This program is free software; you can distribute 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.
 *
 * Authors:	J Hadi Salim <jhs@mojatatu.com>
 *
 * Pedagogical example. Adds a string that will be printed every time
 * the simple instance is hit.
 * Use this as a skeleton action and keep modifying it to meet your needs.
 * Look at linux/tc_act/tc_defact.h for the different components ids and
 * definitions used in  this actions
 *
 * example use, yell "Incoming ICMP!" every time you see an incoming ICMP on
 * eth0. Steps are:
 * 1) Add an ingress qdisc point to eth0
 * 2) Start a chain on ingress of eth0 that first matches ICMP then invokes
 *    the simple action to shout.
 * 3) display stats and show that no packet has been seen by the action
 * 4) Send one ping packet to google (expect to receive a response back)
 * 5) grep the logs to see the logged message
 * 6) display stats again and observe increment by 1
 *
  hadi@noma1:$ tc qdisc add dev eth0 ingress
  hadi@noma1:$tc filter add dev eth0 parent ffff: protocol ip prio 5 \
	 u32 match ip protocol 1 0xff flowid 1:1 action simple "Incoming ICMP"

  hadi@noma1:$ sudo tc -s filter ls  dev eth0 parent ffff:
   filter protocol ip pref 5 u32
   filter protocol ip pref 5 u32 fh 800: ht divisor 1
   filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
     match 00010000/00ff0000 at 8
	action order 1: Simple <Incoming ICMP>
	 index 4 ref 1 bind 1 installed 29 sec used 29 sec
	 Action statistics:
		Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
		backlog 0b 0p requeues 0


  hadi@noma1$ ping -c 1 www.google.ca
  PING www.google.ca (74.125.225.120) 56(84) bytes of data.
  64 bytes from ord08s08-in-f24.1e100.net (74.125.225.120): icmp_req=1 ttl=53 time=31.3 ms

  --- www.google.ca ping statistics ---
  1 packets transmitted, 1 received, 0% packet loss, time 0ms
  rtt min/avg/max/mdev = 31.316/31.316/31.316/0.000 ms

  hadi@noma1$ dmesg | grep simple
  [135354.473951] simple: Incoming ICMP_1

  hadi@noma1$ sudo tc/tc -s filter ls  dev eth0 parent ffff:
  filter protocol ip pref 5 u32
  filter protocol ip pref 5 u32 fh 800: ht divisor 1
  filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
    match 00010000/00ff0000 at 8
	action order 1: Simple <Incoming ICMP>
	 index 4 ref 1 bind 1 installed 206 sec used 67 sec
	Action statistics:
	Sent 84 bytes 1 pkt (dropped 0, overlimits 0 requeues 0)
	backlog 0b 0p requeues 0
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include "utils.h"
#include "tc_util.h"
#include <linux/tc_act/tc_defact.h>

#ifndef SIMP_MAX_DATA
#define SIMP_MAX_DATA   32
#endif
static void explain(void)
{
	fprintf(stderr, "Usage:... simple [sdata STRING] [index INDEX] [CONTROL]\n");
	fprintf(stderr, "\tSTRING being an arbitrary string\n"
		"\tINDEX := optional index value used\n"
		"\tCONTROL := reclassify|pipe|drop|continue|ok\n");
}

static void usage(void)
{
	explain();
	exit(-1);
}

static int
parse_simple(struct action_util *a, int *argc_p, char ***argv_p, int tca_id,
	     struct nlmsghdr *n)
{
	struct tc_defact sel = {};
	int argc = *argc_p;
	char **argv = *argv_p;
	int ok = 0;
	struct rtattr *tail;
	char *simpdata = NULL;

	while (argc > 0) {
		if (matches(*argv, "simple") == 0) {
			NEXT_ARG();
		} else if (matches(*argv, "sdata") == 0) {
			NEXT_ARG();
			ok += 1;
			simpdata = *argv;
			argc--;
			argv++;
		} else if (matches(*argv, "help") == 0) {
			usage();
		} else {
			break;
		}
	}

	if (argc) {
		if (matches(*argv, "index") == 0) {
			NEXT_ARG();
			if (get_u32(&sel.index, *argv, 10)) {
				fprintf(stderr, "simple: Illegal \"index\" (%s)\n",
					*argv);
				return -1;
			}
			ok += 1;
			argc--;
			argv++;
		}
	}

	if (!ok) {
		explain();
		return -1;
	}

	if (simpdata && (strlen(simpdata) > (SIMP_MAX_DATA - 1))) {
		fprintf(stderr, "simple: Illegal string len %zu <%s>\n",
			strlen(simpdata), simpdata);
		return -1;
	}

	sel.action = TC_ACT_PIPE;

	tail = addattr_nest(n, MAX_MSG, tca_id);
	addattr_l(n, MAX_MSG, TCA_DEF_PARMS, &sel, sizeof(sel));
	if (simpdata)
		addattr_l(n, MAX_MSG, TCA_DEF_DATA, simpdata, SIMP_MAX_DATA);
	addattr_nest_end(n, tail);

	*argc_p = argc;
	*argv_p = argv;
	return 0;
}

static int print_simple(struct action_util *au, FILE *f, struct rtattr *arg)
{
	struct tc_defact *sel;
	struct rtattr *tb[TCA_DEF_MAX + 1];
	char *simpdata;

	if (arg == NULL)
		return -1;

	parse_rtattr_nested(tb, TCA_DEF_MAX, arg);

	if (tb[TCA_DEF_PARMS] == NULL) {
		fprintf(f, "[NULL simple parameters]");
		return -1;
	}
	sel = RTA_DATA(tb[TCA_DEF_PARMS]);

	if (tb[TCA_DEF_DATA] == NULL) {
		fprintf(f, "[missing simple string]");
		return -1;
	}

	simpdata = RTA_DATA(tb[TCA_DEF_DATA]);

	fprintf(f, "Simple <%s>\n", simpdata);
	fprintf(f, "\t index %u ref %d bind %d", sel->index,
		sel->refcnt, sel->bindcnt);

	if (show_stats) {
		if (tb[TCA_DEF_TM]) {
			struct tcf_t *tm = RTA_DATA(tb[TCA_DEF_TM]);

			print_tm(f, tm);
		}
	}
	fprintf(f, "\n");

	return 0;
}

struct action_util simple_action_util = {
	.id = "simple",
	.parse_aopt = parse_simple,
	.print_aopt = print_simple,
};
Commit	Line	Data
087f46ee JHS	1	/*
	2	* m_simple.c simple action
	3	*
	4	* This program is free software; you can distribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: J Hadi Salim <jhs@mojatatu.com>
	10	*
b2e116d6	11	* Pedagogical example. Adds a string that will be printed every time
3d0b7439	12	* the simple instance is hit.
087f46ee JHS	13	* Use this as a skeleton action and keep modifying it to meet your needs.
	14	* Look at linux/tc_act/tc_defact.h for the different components ids and
	15	* definitions used in this actions
	16	*
	17	* example use, yell "Incoming ICMP!" every time you see an incoming ICMP on
	18	* eth0. Steps are:
	19	* 1) Add an ingress qdisc point to eth0
	20	* 2) Start a chain on ingress of eth0 that first matches ICMP then invokes
	21	* the simple action to shout.
	22	* 3) display stats and show that no packet has been seen by the action
	23	* 4) Send one ping packet to google (expect to receive a response back)
	24	* 5) grep the logs to see the logged message
	25	* 6) display stats again and observe increment by 1
	26	*
	27	hadi@noma1:$ tc qdisc add dev eth0 ingress
	28	hadi@noma1:$tc filter add dev eth0 parent ffff: protocol ip prio 5 \
3d0b7439 SH	29	u32 match ip protocol 1 0xff flowid 1:1 action simple "Incoming ICMP"
3d0b7439 SH	30
087f46ee	31	hadi@noma1:$ sudo tc -s filter ls dev eth0 parent ffff:
3d0b7439 SH	32	filter protocol ip pref 5 u32
	33	filter protocol ip pref 5 u32 fh 800: ht divisor 1
	34	filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
087f46ee	35	match 00010000/00ff0000 at 8
3d0b7439 SH	36	action order 1: Simple <Incoming ICMP>
	37	index 4 ref 1 bind 1 installed 29 sec used 29 sec
	38	Action statistics:
	39	Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
	40	backlog 0b 0p requeues 0
	41
	42
087f46ee JHS	43	hadi@noma1$ ping -c 1 www.google.ca
	44	PING www.google.ca (74.125.225.120) 56(84) bytes of data.
	45	64 bytes from ord08s08-in-f24.1e100.net (74.125.225.120): icmp_req=1 ttl=53 time=31.3 ms
	46
	47	--- www.google.ca ping statistics ---
	48	1 packets transmitted, 1 received, 0% packet loss, time 0ms
	49	rtt min/avg/max/mdev = 31.316/31.316/31.316/0.000 ms
	50
	51	hadi@noma1$ dmesg \| grep simple
	52	[135354.473951] simple: Incoming ICMP_1
	53
	54	hadi@noma1$ sudo tc/tc -s filter ls dev eth0 parent ffff:
3d0b7439 SH	55	filter protocol ip pref 5 u32
	56	filter protocol ip pref 5 u32 fh 800: ht divisor 1
	57	filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
087f46ee JHS	58	match 00010000/00ff0000 at 8
	59	action order 1: Simple <Incoming ICMP>
	60	index 4 ref 1 bind 1 installed 206 sec used 67 sec
	61	Action statistics:
3d0b7439 SH	62	Sent 84 bytes 1 pkt (dropped 0, overlimits 0 requeues 0)
3d0b7439 SH	63	backlog 0b 0p requeues 0
087f46ee JHS	64	*/
	65
	66	#include <stdio.h>
	67	#include <stdlib.h>
	68	#include <unistd.h>
087f46ee JHS	69	#include <fcntl.h>
	70	#include <sys/socket.h>
	71	#include <netinet/in.h>
	72	#include <arpa/inet.h>
	73	#include <string.h>
	74	#include "utils.h"
	75	#include "tc_util.h"
	76	#include <linux/tc_act/tc_defact.h>
	77
	78	#ifndef SIMP_MAX_DATA
	79	#define SIMP_MAX_DATA 32
	80	#endif
	81	static void explain(void)
	82	{
e2a055dd	83	fprintf(stderr, "Usage:... simple [sdata STRING] [index INDEX] [CONTROL]\n");
fdf1bdd0	84	fprintf(stderr, "\tSTRING being an arbitrary string\n"
620fc669 SH	85	"\tINDEX := optional index value used\n"
620fc669 SH	86	"\tCONTROL := reclassify\|pipe\|drop\|continue\|ok\n");
087f46ee JHS	87	}
	88
	89	static void usage(void)
	90	{
	91	explain();
	92	exit(-1);
	93	}
	94
	95	static int
	96	parse_simple(struct action_util a, int argc_p, char ***argv_p, int tca_id,
	97	struct nlmsghdr *n)
	98	{
	99	struct tc_defact sel = {};
	100	int argc = *argc_p;
	101	char *argv = argv_p;
e70b9f16	102	int ok = 0;
087f46ee JHS	103	struct rtattr *tail;
	104	char *simpdata = NULL;
	105
087f46ee JHS	106	while (argc > 0) {
	107	if (matches(*argv, "simple") == 0) {
	108	NEXT_ARG();
fdf1bdd0 JHS	109	} else if (matches(*argv, "sdata") == 0) {
	110	NEXT_ARG();
	111	ok += 1;
087f46ee	112	simpdata = *argv;
087f46ee JHS	113	argc--;
087f46ee JHS	114	argv++;
087f46ee JHS	115	} else if (matches(*argv, "help") == 0) {
	116	usage();
	117	} else {
	118	break;
	119	}
087f46ee JHS	120	}
087f46ee JHS	121
087f46ee JHS	122	if (argc) {
	123	if (matches(*argv, "index") == 0) {
	124	NEXT_ARG();
	125	if (get_u32(&sel.index, *argv, 10)) {
e70b9f16	126	fprintf(stderr, "simple: Illegal \"index\" (%s)\n",
fdf1bdd0	127	*argv);
087f46ee JHS	128	return -1;
087f46ee JHS	129	}
fdf1bdd0	130	ok += 1;
087f46ee JHS	131	argc--;
	132	argv++;
	133	}
	134	}
	135
fdf1bdd0 JHS	136	if (!ok) {
	137	explain();
	138	return -1;
	139	}
	140
	141	if (simpdata && (strlen(simpdata) > (SIMP_MAX_DATA - 1))) {
32a121cb	142	fprintf(stderr, "simple: Illegal string len %zu <%s>\n",
087f46ee JHS	143	strlen(simpdata), simpdata);
	144	return -1;
	145	}
	146
	147	sel.action = TC_ACT_PIPE;
	148
c14f9d92	149	tail = addattr_nest(n, MAX_MSG, tca_id);
087f46ee	150	addattr_l(n, MAX_MSG, TCA_DEF_PARMS, &sel, sizeof(sel));
fdf1bdd0 JHS	151	if (simpdata)
fdf1bdd0 JHS	152	addattr_l(n, MAX_MSG, TCA_DEF_DATA, simpdata, SIMP_MAX_DATA);
c14f9d92	153	addattr_nest_end(n, tail);
087f46ee JHS	154
	155	*argc_p = argc;
	156	*argv_p = argv;
	157	return 0;
	158	}
	159
32a121cb	160	static int print_simple(struct action_util au, FILE f, struct rtattr *arg)
087f46ee JHS	161	{
	162	struct tc_defact *sel;
	163	struct rtattr *tb[TCA_DEF_MAX + 1];
	164	char *simpdata;
	165
	166	if (arg == NULL)
	167	return -1;
	168
	169	parse_rtattr_nested(tb, TCA_DEF_MAX, arg);
	170
	171	if (tb[TCA_DEF_PARMS] == NULL) {
	172	fprintf(f, "[NULL simple parameters]");
	173	return -1;
	174	}
	175	sel = RTA_DATA(tb[TCA_DEF_PARMS]);
	176
	177	if (tb[TCA_DEF_DATA] == NULL) {
	178	fprintf(f, "[missing simple string]");
	179	return -1;
	180	}
	181
	182	simpdata = RTA_DATA(tb[TCA_DEF_DATA]);
	183
	184	fprintf(f, "Simple <%s>\n", simpdata);
53075318	185	fprintf(f, "\t index %u ref %d bind %d", sel->index,
087f46ee JHS	186	sel->refcnt, sel->bindcnt);
	187
	188	if (show_stats) {
	189	if (tb[TCA_DEF_TM]) {
	190	struct tcf_t *tm = RTA_DATA(tb[TCA_DEF_TM]);
32a121cb	191
087f46ee	192	print_tm(f, tm);
087f46ee JHS	193	}
087f46ee JHS	194	}
352f6f97	195	fprintf(f, "\n");
087f46ee JHS	196
	197	return 0;
	198	}
	199
	200	struct action_util simple_action_util = {
	201	.id = "simple",
	202	.parse_aopt = parse_simple,
	203	.print_aopt = print_simple,
	204	};