[mirror_iproute2.git] / tc / m_skbmod.c

/*
 * m_skbmod.c	skb modifier action module
 *
 *		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)
 *
 */

#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 <linux/netdevice.h>

#include "rt_names.h"
#include "utils.h"
#include "tc_util.h"
#include <linux/tc_act/tc_skbmod.h>

static void skbmod_explain(void)
{
	fprintf(stderr,
		"Usage:... skbmod {[set <SETTABLE>] [swap <SWAPABLE>]} [CONTROL] [index INDEX]\n"
		"where SETTABLE is: [dmac DMAC] [smac SMAC] [etype ETYPE]\n"
		"where SWAPABLE is: \"mac\" to swap mac addresses\n"
		"note: \"swap mac\" is done after any outstanding D/SMAC change\n"
		"\tDMAC := 6 byte Destination MAC address\n"
		"\tSMAC := optional 6 byte Source MAC address\n"
		"\tETYPE := optional 16 bit ethertype\n"
		"\tCONTROL := reclassify | pipe | drop | continue | ok |\n"
		"\t           goto chain <CHAIN_INDEX>\n"
		"\tINDEX := skbmod index value to use\n");
}

static void skbmod_usage(void)
{
	skbmod_explain();
	exit(-1);
}

static int parse_skbmod(struct action_util *a, int *argc_p, char ***argv_p,
			int tca_id, struct nlmsghdr *n)
{
	int argc = *argc_p;
	char **argv = *argv_p;
	int ok = 0;
	struct tc_skbmod p;
	struct rtattr *tail;
	char dbuf[ETH_ALEN];
	char sbuf[ETH_ALEN];
	__u16 skbmod_etype = 0;
	char *daddr = NULL;
	char *saddr = NULL;

	memset(&p, 0, sizeof(p));

	if (argc <= 0)
		return -1;

	while (argc > 0) {
		if (matches(*argv, "skbmod") == 0) {
			NEXT_ARG();
			continue;
		} else if (matches(*argv, "swap") == 0) {
			NEXT_ARG();
			continue;
		} else if (matches(*argv, "mac") == 0) {
			p.flags |= SKBMOD_F_SWAPMAC;
			ok += 1;
		} else if (matches(*argv, "set") == 0) {
			NEXT_ARG();
			continue;
		} else if (matches(*argv, "etype") == 0) {
			NEXT_ARG();
			if (get_u16(&skbmod_etype, *argv, 0))
				invarg("ethertype is invalid", *argv);
			fprintf(stderr, "skbmod etype 0x%x\n", skbmod_etype);
			p.flags |= SKBMOD_F_ETYPE;
			ok += 1;
		} else if (matches(*argv, "dmac") == 0) {
			NEXT_ARG();
			daddr = *argv;
			if (sscanf(daddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
				   dbuf, dbuf + 1, dbuf + 2,
				   dbuf + 3, dbuf + 4, dbuf + 5) != 6) {
				fprintf(stderr, "Invalid dst mac address %s\n",
					daddr);
				return -1;
			}
			p.flags |= SKBMOD_F_DMAC;
			fprintf(stderr, "dst MAC address <%s>\n", daddr);
			ok += 1;

		} else if (matches(*argv, "smac") == 0) {
			NEXT_ARG();
			saddr = *argv;
			if (sscanf(saddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
				   sbuf, sbuf + 1, sbuf + 2,
				   sbuf + 3, sbuf + 4, sbuf + 5) != 6) {
				fprintf(stderr, "Invalid smac address %s\n",
					saddr);
				return -1;
			}
			p.flags |= SKBMOD_F_SMAC;
			fprintf(stderr, "src MAC address <%s>\n", saddr);
			ok += 1;
		} else if (matches(*argv, "help") == 0) {
			skbmod_usage();
		} else {
			break;
		}

		argc--;
		argv++;
	}

	parse_action_control_dflt(&argc, &argv, &p.action, false, TC_ACT_PIPE);

	NEXT_ARG_FWD();
	if (argc) {
		if (matches(*argv, "index") == 0) {
			NEXT_ARG();
			if (get_u32(&p.index, *argv, 0)) {
				fprintf(stderr, "skbmod: Illegal \"index\"\n");
				return -1;
			}
			ok++;
			argc--;
			argv++;
		}
	}

	if (!ok) {
		fprintf(stderr, "skbmod requires at least one option\n");
		skbmod_usage();
	}

	tail = NLMSG_TAIL(n);
	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
	addattr_l(n, MAX_MSG, TCA_SKBMOD_PARMS, &p, sizeof(p));

	if (daddr)
		addattr_l(n, MAX_MSG, TCA_SKBMOD_DMAC, dbuf, ETH_ALEN);
	if (skbmod_etype)
		addattr16(n, MAX_MSG, TCA_SKBMOD_ETYPE, skbmod_etype);
	if (saddr)
		addattr_l(n, MAX_MSG, TCA_SKBMOD_SMAC, sbuf, ETH_ALEN);

	tail->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail;

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

static int print_skbmod(struct action_util *au, FILE *f, struct rtattr *arg)
{
	struct tc_skbmod *p = NULL;
	struct rtattr *tb[TCA_SKBMOD_MAX + 1];
	__u16 skbmod_etype = 0;
	int has_optional = 0;
	SPRINT_BUF(b1);
	SPRINT_BUF(b2);

	if (arg == NULL)
		return -1;

	parse_rtattr_nested(tb, TCA_SKBMOD_MAX, arg);

	if (tb[TCA_SKBMOD_PARMS] == NULL) {
		fprintf(f, "[NULL skbmod parameters]");
		return -1;
	}

	p = RTA_DATA(tb[TCA_SKBMOD_PARMS]);

	fprintf(f, "skbmod ");
	print_action_control(f, "", p->action, " ");

	if (tb[TCA_SKBMOD_ETYPE]) {
		skbmod_etype = rta_getattr_u16(tb[TCA_SKBMOD_ETYPE]);
		has_optional = 1;
		fprintf(f, "set etype 0x%X ", skbmod_etype);
	}

	if (has_optional)
		fprintf(f, "\n\t ");

	if (tb[TCA_SKBMOD_DMAC]) {
		has_optional = 1;
		fprintf(f, "set dmac %s ",
			ll_addr_n2a(RTA_DATA(tb[TCA_SKBMOD_DMAC]),
				    RTA_PAYLOAD(tb[TCA_SKBMOD_DMAC]), 0, b1,
				    sizeof(b1)));

	}

	if (tb[TCA_SKBMOD_SMAC]) {
		has_optional = 1;
		fprintf(f, "set smac %s ",
			ll_addr_n2a(RTA_DATA(tb[TCA_SKBMOD_SMAC]),
				    RTA_PAYLOAD(tb[TCA_SKBMOD_SMAC]), 0, b2,
				    sizeof(b2)));
	}

	if (p->flags & SKBMOD_F_SWAPMAC)
		fprintf(f, "swap mac ");

	fprintf(f, "\n\t index %u ref %d bind %d", p->index, p->refcnt,
		p->bindcnt);
	if (show_stats) {
		if (tb[TCA_SKBMOD_TM]) {
			struct tcf_t *tm = RTA_DATA(tb[TCA_SKBMOD_TM]);

			print_tm(f, tm);
		}
	}

	fprintf(f, "\n");

	return 0;
}

struct action_util skbmod_action_util = {
	.id = "skbmod",
	.parse_aopt = parse_skbmod,
	.print_aopt = print_skbmod,
};
Commit	Line	Data
da651289 JHS	1	/*
	2	* m_skbmod.c skb modifier action module
	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	*
	11	*/
	12
	13	#include <stdio.h>
	14	#include <stdlib.h>
	15	#include <unistd.h>
da651289 JHS	16	#include <fcntl.h>
	17	#include <sys/socket.h>
	18	#include <netinet/in.h>
	19	#include <arpa/inet.h>
	20	#include <string.h>
	21	#include <linux/netdevice.h>
	22
	23	#include "rt_names.h"
	24	#include "utils.h"
	25	#include "tc_util.h"
	26	#include <linux/tc_act/tc_skbmod.h>
	27
	28	static void skbmod_explain(void)
	29	{
	30	fprintf(stderr,
557b7054 SH	31	"Usage:... skbmod {[set <SETTABLE>] [swap <SWAPABLE>]} [CONTROL] [index INDEX]\n"
	32	"where SETTABLE is: [dmac DMAC] [smac SMAC] [etype ETYPE]\n"
	33	"where SWAPABLE is: \"mac\" to swap mac addresses\n"
	34	"note: \"swap mac\" is done after any outstanding D/SMAC change\n"
da651289 JHS	35	"\tDMAC := 6 byte Destination MAC address\n"
	36	"\tSMAC := optional 6 byte Source MAC address\n"
	37	"\tETYPE := optional 16 bit ethertype\n"
d19f72f7 JP	38	"\tCONTROL := reclassify \| pipe \| drop \| continue \| ok \|\n"
d19f72f7 JP	39	"\t goto chain <CHAIN_INDEX>\n"
da651289 JHS	40	"\tINDEX := skbmod index value to use\n");
	41	}
	42
	43	static void skbmod_usage(void)
	44	{
	45	skbmod_explain();
	46	exit(-1);
	47	}
	48
	49	static int parse_skbmod(struct action_util a, int argc_p, char ***argv_p,
	50	int tca_id, struct nlmsghdr *n)
	51	{
	52	int argc = *argc_p;
	53	char *argv = argv_p;
	54	int ok = 0;
	55	struct tc_skbmod p;
	56	struct rtattr *tail;
	57	char dbuf[ETH_ALEN];
	58	char sbuf[ETH_ALEN];
	59	__u16 skbmod_etype = 0;
	60	char *daddr = NULL;
	61	char *saddr = NULL;
	62
	63	memset(&p, 0, sizeof(p));
da651289 JHS	64
	65	if (argc <= 0)
	66	return -1;
	67
	68	while (argc > 0) {
	69	if (matches(*argv, "skbmod") == 0) {
	70	NEXT_ARG();
	71	continue;
	72	} else if (matches(*argv, "swap") == 0) {
	73	NEXT_ARG();
	74	continue;
	75	} else if (matches(*argv, "mac") == 0) {
	76	p.flags \|= SKBMOD_F_SWAPMAC;
	77	ok += 1;
	78	} else if (matches(*argv, "set") == 0) {
	79	NEXT_ARG();
	80	continue;
	81	} else if (matches(*argv, "etype") == 0) {
	82	NEXT_ARG();
	83	if (get_u16(&skbmod_etype, *argv, 0))
	84	invarg("ethertype is invalid", *argv);
	85	fprintf(stderr, "skbmod etype 0x%x\n", skbmod_etype);
	86	p.flags \|= SKBMOD_F_ETYPE;
	87	ok += 1;
	88	} else if (matches(*argv, "dmac") == 0) {
	89	NEXT_ARG();
	90	daddr = *argv;
	91	if (sscanf(daddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
	92	dbuf, dbuf + 1, dbuf + 2,
	93	dbuf + 3, dbuf + 4, dbuf + 5) != 6) {
	94	fprintf(stderr, "Invalid dst mac address %s\n",
	95	daddr);
	96	return -1;
	97	}
	98	p.flags \|= SKBMOD_F_DMAC;
	99	fprintf(stderr, "dst MAC address <%s>\n", daddr);
	100	ok += 1;
	101
	102	} else if (matches(*argv, "smac") == 0) {
	103	NEXT_ARG();
	104	saddr = *argv;
	105	if (sscanf(saddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
	106	sbuf, sbuf + 1, sbuf + 2,
	107	sbuf + 3, sbuf + 4, sbuf + 5) != 6) {
	108	fprintf(stderr, "Invalid smac address %s\n",
	109	saddr);
	110	return -1;
	111	}
	112	p.flags \|= SKBMOD_F_SMAC;
	113	fprintf(stderr, "src MAC address <%s>\n", saddr);
	114	ok += 1;
	115	} else if (matches(*argv, "help") == 0) {
	116	skbmod_usage();
	117	} else {
	118	break;
	119	}
	120
	121	argc--;
	122	argv++;
	123	}
	124
e67aba55	125	parse_action_control_dflt(&argc, &argv, &p.action, false, TC_ACT_PIPE);
da651289	126
3572e01a	127	NEXT_ARG_FWD();
da651289 JHS	128	if (argc) {
	129	if (matches(*argv, "index") == 0) {
	130	NEXT_ARG();
	131	if (get_u32(&p.index, *argv, 0)) {
	132	fprintf(stderr, "skbmod: Illegal \"index\"\n");
	133	return -1;
	134	}
	135	ok++;
	136	argc--;
	137	argv++;
	138	}
	139	}
	140
	141	if (!ok) {
	142	fprintf(stderr, "skbmod requires at least one option\n");
	143	skbmod_usage();
	144	}
	145
	146	tail = NLMSG_TAIL(n);
	147	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
	148	addattr_l(n, MAX_MSG, TCA_SKBMOD_PARMS, &p, sizeof(p));
	149
	150	if (daddr)
	151	addattr_l(n, MAX_MSG, TCA_SKBMOD_DMAC, dbuf, ETH_ALEN);
	152	if (skbmod_etype)
	153	addattr16(n, MAX_MSG, TCA_SKBMOD_ETYPE, skbmod_etype);
	154	if (saddr)
	155	addattr_l(n, MAX_MSG, TCA_SKBMOD_SMAC, sbuf, ETH_ALEN);
	156
	157	tail->rta_len = (void )NLMSG_TAIL(n) - (void )tail;
	158
	159	*argc_p = argc;
	160	*argv_p = argv;
	161	return 0;
	162	}
	163
	164	static int print_skbmod(struct action_util au, FILE f, struct rtattr *arg)
	165	{
	166	struct tc_skbmod *p = NULL;
	167	struct rtattr *tb[TCA_SKBMOD_MAX + 1];
	168	__u16 skbmod_etype = 0;
	169	int has_optional = 0;
	170	SPRINT_BUF(b1);
	171	SPRINT_BUF(b2);
	172
	173	if (arg == NULL)
	174	return -1;
	175
	176	parse_rtattr_nested(tb, TCA_SKBMOD_MAX, arg);
	177
	178	if (tb[TCA_SKBMOD_PARMS] == NULL) {
	179	fprintf(f, "[NULL skbmod parameters]");
	180	return -1;
	181	}
	182
	183	p = RTA_DATA(tb[TCA_SKBMOD_PARMS]);
	184
e67aba55 JP	185	fprintf(f, "skbmod ");
e67aba55 JP	186	print_action_control(f, "", p->action, " ");
da651289 JHS	187
	188	if (tb[TCA_SKBMOD_ETYPE]) {
	189	skbmod_etype = rta_getattr_u16(tb[TCA_SKBMOD_ETYPE]);
	190	has_optional = 1;
	191	fprintf(f, "set etype 0x%X ", skbmod_etype);
	192	}
	193
	194	if (has_optional)
	195	fprintf(f, "\n\t ");
	196
	197	if (tb[TCA_SKBMOD_DMAC]) {
	198	has_optional = 1;
	199	fprintf(f, "set dmac %s ",
	200	ll_addr_n2a(RTA_DATA(tb[TCA_SKBMOD_DMAC]),
	201	RTA_PAYLOAD(tb[TCA_SKBMOD_DMAC]), 0, b1,
	202	sizeof(b1)));
	203
	204	}
	205
	206	if (tb[TCA_SKBMOD_SMAC]) {
	207	has_optional = 1;
	208	fprintf(f, "set smac %s ",
	209	ll_addr_n2a(RTA_DATA(tb[TCA_SKBMOD_SMAC]),
	210	RTA_PAYLOAD(tb[TCA_SKBMOD_SMAC]), 0, b2,
	211	sizeof(b2)));
	212	}
	213
	214	if (p->flags & SKBMOD_F_SWAPMAC)
	215	fprintf(f, "swap mac ");
	216
53075318	217	fprintf(f, "\n\t index %u ref %d bind %d", p->index, p->refcnt,
da651289 JHS	218	p->bindcnt);
	219	if (show_stats) {
	220	if (tb[TCA_SKBMOD_TM]) {
	221	struct tcf_t *tm = RTA_DATA(tb[TCA_SKBMOD_TM]);
	222
	223	print_tm(f, tm);
	224	}
	225	}
	226
	227	fprintf(f, "\n");
	228
	229	return 0;
	230	}
	231
	232	struct action_util skbmod_action_util = {
	233	.id = "skbmod",
	234	.parse_aopt = parse_skbmod,
	235	.print_aopt = print_skbmod,
	236	};