/*

 * q_htb.c		HTB.

 *

 *		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:	Martin Devera, devik@cdi.cz

 *

 */

#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"

#define HTB_TC_VER 0x30003

#if HTB_TC_VER >> 16 != TC_HTB_PROTOVER

#error "Different kernel and TC HTB versions"

#endif

static void explain(void)

{

	fprintf(stderr, "Usage: ... qdisc add ... htb [default N] [r2q N]\n"

		"                      [direct_qlen P]\n"

		" default  minor id of class to which unclassified packets are sent {0}\n"

		" r2q      DRR quantums are computed as rate in Bps/r2q {10}\n"

		" debug    string of 16 numbers each 0-3 {0}\n\n"

		" direct_qlen  Limit of the direct queue {in packets}\n"

		"... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]\n"

		"                      [prio P] [slot S] [pslot PS]\n"

		"                      [ceil R2] [cburst B2] [mtu MTU] [quantum Q]\n"

		" rate     rate allocated to this class (class can still borrow)\n"

		" burst    max bytes burst which can be accumulated during idle period {computed}\n"

		" mpu      minimum packet size used in rate computations\n"

		" overhead per-packet size overhead used in rate computations\n"

		" linklay  adapting to a linklayer e.g. atm\n"

		" ceil     definite upper class rate (no borrows) {rate}\n"

		" cburst   burst but for ceil {computed}\n"

		" mtu      max packet size we create rate map for {1600}\n"

		" prio     priority of leaf; lower are served first {0}\n"

		" quantum  how much bytes to serve from leaf at once {use r2q}\n"

		"\nTC HTB version %d.%d\n", HTB_TC_VER>>16, HTB_TC_VER&0xffff

		);

}

static void explain1(char *arg)

{

    fprintf(stderr, "Illegal \"%s\"\n", arg);

    explain();

}

static int htb_parse_opt(struct qdisc_util *qu, int argc,

			 char **argv, struct nlmsghdr *n, const char *dev)

{

	unsigned int direct_qlen = ~0U;

	struct tc_htb_glob opt = {

		.rate2quantum = 10,

		.version = 3,

	};

	struct rtattr *tail;

	unsigned int i; char *p;

	while (argc > 0) {

		if (matches(*argv, "r2q") == 0) {

			NEXT_ARG();

			if (get_u32(&opt.rate2quantum, *argv, 10)) {

				explain1("r2q"); return -1;

			}

		} else if (matches(*argv, "default") == 0) {

			NEXT_ARG();

			if (get_u32(&opt.defcls, *argv, 16)) {

				explain1("default"); return -1;

			}

		} else if (matches(*argv, "debug") == 0) {

			NEXT_ARG(); p = *argv;

			for (i = 0; i < 16; i++, p++) {

				if (*p < '0' || *p > '3') break;

				opt.debug |= (*p-'0')<<(2*i);

			}

		} else if (matches(*argv, "direct_qlen") == 0) {

			NEXT_ARG();

			if (get_u32(&direct_qlen, *argv, 10)) {

				explain1("direct_qlen"); return -1;

			}

		} else {

			fprintf(stderr, "What is \"%s\"?\n", *argv);

			explain();

			return -1;

		}

		argc--; argv++;

	}

	tail = addattr_nest(n, 1024, TCA_OPTIONS);

	addattr_l(n, 2024, TCA_HTB_INIT, &opt, NLMSG_ALIGN(sizeof(opt)));

	if (direct_qlen != ~0U)

		addattr_l(n, 2024, TCA_HTB_DIRECT_QLEN,

			  &direct_qlen, sizeof(direct_qlen));

	addattr_nest_end(n, tail);

	return 0;

}

static int htb_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)

{

	struct tc_htb_opt opt = {};

	__u32 rtab[256], ctab[256];

	unsigned buffer = 0, cbuffer = 0;

	int cell_log =  -1, ccell_log = -1;

	unsigned int mtu = 1600; /* eth packet len */

	unsigned short mpu = 0;

	unsigned short overhead = 0;

	unsigned int linklayer  = LINKLAYER_ETHERNET; /* Assume ethernet */

	struct rtattr *tail;

	__u64 ceil64 = 0, rate64 = 0;

	while (argc > 0) {

		if (matches(*argv, "prio") == 0) {

			NEXT_ARG();

			if (get_u32(&opt.prio, *argv, 10)) {

				explain1("prio"); return -1;

			}

		} else if (matches(*argv, "mtu") == 0) {

			NEXT_ARG();

			if (get_u32(&mtu, *argv, 10)) {

				explain1("mtu"); return -1;

			}

		} else if (matches(*argv, "mpu") == 0) {

			NEXT_ARG();

			if (get_u16(&mpu, *argv, 10)) {

				explain1("mpu"); return -1;

			}

		} else if (matches(*argv, "overhead") == 0) {

			NEXT_ARG();

			if (get_u16(&overhead, *argv, 10)) {

				explain1("overhead"); return -1;

			}

		} else if (matches(*argv, "linklayer") == 0) {

			NEXT_ARG();

			if (get_linklayer(&linklayer, *argv)) {

				explain1("linklayer"); return -1;

			}

		} else if (matches(*argv, "quantum") == 0) {

			NEXT_ARG();

			if (get_u32(&opt.quantum, *argv, 10)) {

				explain1("quantum"); return -1;

			}

		} else if (matches(*argv, "burst") == 0 ||

			   strcmp(*argv, "buffer") == 0 ||

			   strcmp(*argv, "maxburst") == 0) {

			NEXT_ARG();

			if (get_size_and_cell(&buffer, &cell_log, *argv) < 0) {

				explain1("buffer");

				return -1;

			}

		} else if (matches(*argv, "cburst") == 0 ||

			   strcmp(*argv, "cbuffer") == 0 ||

			   strcmp(*argv, "cmaxburst") == 0) {

			NEXT_ARG();

			if (get_size_and_cell(&cbuffer, &ccell_log, *argv) < 0) {

				explain1("cbuffer");

				return -1;

			}

		} else if (strcmp(*argv, "ceil") == 0) {

			NEXT_ARG();

			if (ceil64) {

				fprintf(stderr, "Double \"ceil\" spec\n");

				return -1;

			}

			if (strchr(*argv, '%')) {

				if (get_percent_rate64(&ceil64, *argv, dev)) {

					explain1("ceil");

					return -1;

				}

			} else if (get_rate64(&ceil64, *argv)) {

				explain1("ceil");

				return -1;

			}

		} else if (strcmp(*argv, "rate") == 0) {

			NEXT_ARG();

			if (rate64) {

				fprintf(stderr, "Double \"rate\" spec\n");

				return -1;

			}

			if (strchr(*argv, '%')) {

				if (get_percent_rate64(&rate64, *argv, dev)) {

					explain1("rate");

					return -1;

				}

			} else if (get_rate64(&rate64, *argv)) {

				explain1("rate");

				return -1;

			}

		} else if (strcmp(*argv, "help") == 0) {

			explain();

			return -1;

		} else {

			fprintf(stderr, "What is \"%s\"?\n", *argv);

			explain();

			return -1;

		}

		argc--; argv++;

	}

	if (!rate64) {

		fprintf(stderr, "\"rate\" is required.\n");

		return -1;

	}

	/* if ceil params are missing, use the same as rate */

	if (!ceil64)

		ceil64 = rate64;

	opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64;

	opt.ceil.rate = (ceil64 >= (1ULL << 32)) ? ~0U : ceil64;

	/* compute minimal allowed burst from rate; mtu is added here to make

	   sute that buffer is larger than mtu and to have some safeguard space */

	if (!buffer)

		buffer = rate64 / get_hz() + mtu;

	if (!cbuffer)

		cbuffer = ceil64 / get_hz() + mtu;

	opt.ceil.overhead = overhead;

	opt.rate.overhead = overhead;

	opt.ceil.mpu = mpu;

	opt.rate.mpu = mpu;

	if (tc_calc_rtable(&opt.rate, rtab, cell_log, mtu, linklayer) < 0) {

		fprintf(stderr, "htb: failed to calculate rate table.\n");

		return -1;

	}

	opt.buffer = tc_calc_xmittime(rate64, buffer);

	if (tc_calc_rtable(&opt.ceil, ctab, ccell_log, mtu, linklayer) < 0) {

		fprintf(stderr, "htb: failed to calculate ceil rate table.\n");

		return -1;

	}

	opt.cbuffer = tc_calc_xmittime(ceil64, cbuffer);

	tail = addattr_nest(n, 1024, TCA_OPTIONS);

	if (rate64 >= (1ULL << 32))

		addattr_l(n, 1124, TCA_HTB_RATE64, &rate64, sizeof(rate64));

	if (ceil64 >= (1ULL << 32))

		addattr_l(n, 1224, TCA_HTB_CEIL64, &ceil64, sizeof(ceil64));

	addattr_l(n, 2024, TCA_HTB_PARMS, &opt, sizeof(opt));

	addattr_l(n, 3024, TCA_HTB_RTAB, rtab, 1024);

	addattr_l(n, 4024, TCA_HTB_CTAB, ctab, 1024);

	addattr_nest_end(n, tail);

	return 0;

}

static int htb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)

{

	struct rtattr *tb[TCA_HTB_MAX + 1];

	struct tc_htb_opt *hopt;

	struct tc_htb_glob *gopt;

	double buffer, cbuffer;

	unsigned int linklayer;

	__u64 rate64, ceil64;

	SPRINT_BUF(b1);

	SPRINT_BUF(b2);

	SPRINT_BUF(b3);

	if (opt == NULL)

		return 0;

	parse_rtattr_nested(tb, TCA_HTB_MAX, opt);

	if (tb[TCA_HTB_PARMS]) {

		hopt = RTA_DATA(tb[TCA_HTB_PARMS]);

		if (RTA_PAYLOAD(tb[TCA_HTB_PARMS])  < sizeof(*hopt)) return -1;

		if (!hopt->level) {

			print_int(PRINT_ANY, "prio", "prio %d ", (int)hopt->prio);

			if (show_details)

				print_int(PRINT_ANY, "quantum", "quantum %d ",

					  (int)hopt->quantum);

		}

		rate64 = hopt->rate.rate;

		if (tb[TCA_HTB_RATE64] &&

		    RTA_PAYLOAD(tb[TCA_HTB_RATE64]) >= sizeof(rate64)) {

			rate64 = rta_getattr_u64(tb[TCA_HTB_RATE64]);

		}

		ceil64 = hopt->ceil.rate;

		if (tb[TCA_HTB_CEIL64] &&

		    RTA_PAYLOAD(tb[TCA_HTB_CEIL64]) >= sizeof(ceil64))

			ceil64 = rta_getattr_u64(tb[TCA_HTB_CEIL64]);

		fprintf(f, "rate %s ", sprint_rate(rate64, b1));

		if (hopt->rate.overhead)

			fprintf(f, "overhead %u ", hopt->rate.overhead);

		buffer = tc_calc_xmitsize(rate64, hopt->buffer);

		fprintf(f, "ceil %s ", sprint_rate(ceil64, b1));

		cbuffer = tc_calc_xmitsize(ceil64, hopt->cbuffer);

		linklayer = (hopt->rate.linklayer & TC_LINKLAYER_MASK);

		if (linklayer > TC_LINKLAYER_ETHERNET || show_details)

			fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b3));

		if (show_details) {

			fprintf(f, "burst %s/%u mpu %s ",

				sprint_size(buffer, b1),

				1<<hopt->rate.cell_log,

				sprint_size(hopt->rate.mpu, b2));

			fprintf(f, "cburst %s/%u mpu %s ",

				sprint_size(cbuffer, b1),

				1<<hopt->ceil.cell_log,

				sprint_size(hopt->ceil.mpu, b2));

			fprintf(f, "level %d ", (int)hopt->level);

		} else {

			fprintf(f, "burst %s ", sprint_size(buffer, b1));

			fprintf(f, "cburst %s ", sprint_size(cbuffer, b1));

		}

		if (show_raw)

			fprintf(f, "buffer [%08x] cbuffer [%08x] ",

				hopt->buffer, hopt->cbuffer);

	}

	if (tb[TCA_HTB_INIT]) {

		gopt = RTA_DATA(tb[TCA_HTB_INIT]);

		if (RTA_PAYLOAD(tb[TCA_HTB_INIT])  < sizeof(*gopt)) return -1;

		print_int(PRINT_ANY, "r2q", "r2q %d", gopt->rate2quantum);

		print_0xhex(PRINT_ANY, "default", " default %#llx", gopt->defcls);

		print_uint(PRINT_ANY, "direct_packets_stat",

			   " direct_packets_stat %u", gopt->direct_pkts);

		if (show_details) {

			sprintf(b1, "%d.%d", gopt->version >> 16, gopt->version & 0xffff);

			print_string(PRINT_ANY, "ver", " ver %s", b1);

		}

	}

	if (tb[TCA_HTB_DIRECT_QLEN] &&

	    RTA_PAYLOAD(tb[TCA_HTB_DIRECT_QLEN]) >= sizeof(__u32)) {

		__u32 direct_qlen = rta_getattr_u32(tb[TCA_HTB_DIRECT_QLEN]);

		print_uint(PRINT_ANY, "direct_qlen", " direct_qlen %u",

			   direct_qlen);

	}

	return 0;

}

static int htb_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)

{

	struct tc_htb_xstats *st;

	if (xstats == NULL)

		return 0;

	if (RTA_PAYLOAD(xstats) < sizeof(*st))

		return -1;

	st = RTA_DATA(xstats);

	fprintf(f, " lended: %u borrowed: %u giants: %u\n",

		st->lends, st->borrows, st->giants);

	fprintf(f, " tokens: %d ctokens: %d\n", st->tokens, st->ctokens);

	return 0;

}

struct qdisc_util htb_qdisc_util = {

	.id		= "htb",

	.parse_qopt	= htb_parse_opt,

	.print_qopt	= htb_print_opt,

	.print_xstats	= htb_print_xstats,

	.parse_copt	= htb_parse_class_opt,

	.print_copt	= htb_print_opt,

};