tc/m_vlan.c

/*
 * m_vlan.c		vlan manipulation module
 *
 *              This program is free software; you can redistribute 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:     Jiri Pirko <jiri@resnulli.us>
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <linux/if_ether.h>
#include "utils.h"
#include "rt_names.h"
#include "tc_util.h"
#include <linux/tc_act/tc_vlan.h>

static const char * const action_names[] = {
	[TCA_VLAN_ACT_POP] = "pop",
	[TCA_VLAN_ACT_PUSH] = "push",
	[TCA_VLAN_ACT_MODIFY] = "modify",
};

static void explain(void)
{
	fprintf(stderr, "Usage: vlan pop\n");
	fprintf(stderr, "       vlan push [ protocol VLANPROTO ] id VLANID [ priority VLANPRIO ] [CONTROL]\n");
	fprintf(stderr, "       vlan modify [ protocol VLANPROTO ] id VLANID [ priority VLANPRIO ] [CONTROL]\n");
	fprintf(stderr, "       VLANPROTO is one of 802.1Q or 802.1AD\n");
	fprintf(stderr, "            with default: 802.1Q\n");
	fprintf(stderr, "       CONTROL := reclassify | pipe | drop | continue | pass\n");
}

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

static bool has_push_attribs(int action)
{
	return action == TCA_VLAN_ACT_PUSH || action == TCA_VLAN_ACT_MODIFY;
}

static int parse_vlan(struct action_util *a, int *argc_p, char ***argv_p,
		      int tca_id, struct nlmsghdr *n)
{
	int argc = *argc_p;
	char **argv = *argv_p;
	struct rtattr *tail;
	int action = 0;
	__u16 id;
	int id_set = 0;
	__u16 proto;
	int proto_set = 0;
	__u8 prio;
	int prio_set = 0;
	struct tc_vlan parm = { 0 };

	if (matches(*argv, "vlan") != 0)
		return -1;

	NEXT_ARG();

	while (argc > 0) {
		if (matches(*argv, "pop") == 0) {
			if (action) {
				fprintf(stderr, "unexpected \"%s\" - action already specified\n",
					*argv);
				explain();
				return -1;
			}
			action = TCA_VLAN_ACT_POP;
		} else if (matches(*argv, "push") == 0) {
			if (action) {
				fprintf(stderr, "unexpected \"%s\" - action already specified\n",
					*argv);
				explain();
				return -1;
			}
			action = TCA_VLAN_ACT_PUSH;
		} else if (matches(*argv, "modify") == 0) {
			if (action) {
				fprintf(stderr, "unexpected \"%s\" - action already specified\n",
					*argv);
				explain();
				return -1;
			}
			action = TCA_VLAN_ACT_MODIFY;
		} else if (matches(*argv, "id") == 0) {
			if (!has_push_attribs(action)) {
				fprintf(stderr, "\"%s\" is only valid for push/modify\n",
					*argv);
				explain();
				return -1;
			}
			NEXT_ARG();
			if (get_u16(&id, *argv, 0))
				invarg("id is invalid", *argv);
			id_set = 1;
		} else if (matches(*argv, "protocol") == 0) {
			if (!has_push_attribs(action)) {
				fprintf(stderr, "\"%s\" is only valid for push/modify\n",
					*argv);
				explain();
				return -1;
			}
			NEXT_ARG();
			if (ll_proto_a2n(&proto, *argv))
				invarg("protocol is invalid", *argv);
			proto_set = 1;
		} else if (matches(*argv, "priority") == 0) {
			if (!has_push_attribs(action)) {
				fprintf(stderr, "\"%s\" is only valid for push/modify\n",
					*argv);
				explain();
				return -1;
			}
			NEXT_ARG();
			if (get_u8(&prio, *argv, 0) || (prio & ~0x7))
				invarg("prio is invalid", *argv);
			prio_set = 1;
		} else if (matches(*argv, "help") == 0) {
			usage();
		} else {
			break;
		}
		argc--;
		argv++;
	}

	parm.action = TC_ACT_PIPE;
	if (argc && !action_a2n(*argv, &parm.action, false))
		NEXT_ARG_FWD();

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

	if (has_push_attribs(action) && !id_set) {
		fprintf(stderr, "id needs to be set for %s\n",
			action_names[action]);
		explain();
		return -1;
	}

	parm.v_action = action;
	tail = NLMSG_TAIL(n);
	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
	addattr_l(n, MAX_MSG, TCA_VLAN_PARMS, &parm, sizeof(parm));
	if (id_set)
		addattr_l(n, MAX_MSG, TCA_VLAN_PUSH_VLAN_ID, &id, 2);
	if (proto_set) {
		if (proto != htons(ETH_P_8021Q) &&
		    proto != htons(ETH_P_8021AD)) {
			fprintf(stderr, "protocol not supported\n");
			explain();
			return -1;
		}

		addattr_l(n, MAX_MSG, TCA_VLAN_PUSH_VLAN_PROTOCOL, &proto, 2);
	}
	if (prio_set)
		addattr8(n, MAX_MSG, TCA_VLAN_PUSH_VLAN_PRIORITY, prio);

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

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

static int print_vlan(struct action_util *au, FILE *f, struct rtattr *arg)
{
	SPRINT_BUF(b1);
	struct rtattr *tb[TCA_VLAN_MAX + 1];
	__u16 val;
	struct tc_vlan *parm;

	if (arg == NULL)
		return -1;

	parse_rtattr_nested(tb, TCA_VLAN_MAX, arg);

	if (!tb[TCA_VLAN_PARMS]) {
		fprintf(f, "[NULL vlan parameters]");
		return -1;
	}
	parm = RTA_DATA(tb[TCA_VLAN_PARMS]);

	fprintf(f, " vlan");

	switch (parm->v_action) {
	case TCA_VLAN_ACT_POP:
		fprintf(f, " pop");
		break;
	case TCA_VLAN_ACT_PUSH:
	case TCA_VLAN_ACT_MODIFY:
		fprintf(f, " %s", action_names[parm->v_action]);
		if (tb[TCA_VLAN_PUSH_VLAN_ID]) {
			val = rta_getattr_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
			fprintf(f, " id %u", val);
		}
		if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
			fprintf(f, " protocol %s",
				ll_proto_n2a(rta_getattr_u16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]),
					     b1, sizeof(b1)));
		}
		if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) {
			val = rta_getattr_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
			fprintf(f, " priority %u", val);
		}
		break;
	}
	fprintf(f, " %s", action_n2a(parm->action));

	fprintf(f, "\n\t index %d ref %d bind %d", parm->index, parm->refcnt,
		parm->bindcnt);

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

			print_tm(f, tm);
		}
	}

	fprintf(f, "\n ");

	return 0;
}

struct action_util vlan_action_util = {
	.id = "vlan",
	.parse_aopt = parse_vlan,
	.print_aopt = print_vlan,
};