335 lines
8.8 KiB
C
335 lines
8.8 KiB
C
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/*
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* q_tbf.c TBF.
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*
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* This program is free software; you can redistribute 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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include "utils.h"
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#include "tc_util.h"
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static void explain(void)
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{
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fprintf(stderr, "Usage: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu BYTES[/BYTES] ]\n");
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fprintf(stderr, " [ peakrate KBPS ] [ latency TIME ] ");
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fprintf(stderr, "[ overhead BYTES ] [ linklayer TYPE ]\n");
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}
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static void explain1(const char *arg, const char *val)
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{
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fprintf(stderr, "tbf: illegal value for \"%s\": \"%s\"\n", arg, val);
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}
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static int tbf_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
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{
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int ok = 0;
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struct tc_tbf_qopt opt = {};
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__u32 rtab[256];
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__u32 ptab[256];
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unsigned buffer = 0, mtu = 0, mpu = 0, latency = 0;
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int Rcell_log = -1, Pcell_log = -1;
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unsigned short overhead = 0;
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unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
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struct rtattr *tail;
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__u64 rate64 = 0, prate64 = 0;
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while (argc > 0) {
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if (matches(*argv, "limit") == 0) {
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NEXT_ARG();
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if (opt.limit) {
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fprintf(stderr, "tbf: duplicate \"limit\" specification\n");
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return -1;
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}
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if (latency) {
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fprintf(stderr, "tbf: specifying both \"latency\" and \"limit\" is not allowed\n");
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return -1;
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}
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if (get_size(&opt.limit, *argv)) {
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explain1("limit", *argv);
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return -1;
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}
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ok++;
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} else if (matches(*argv, "latency") == 0) {
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NEXT_ARG();
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if (latency) {
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fprintf(stderr, "tbf: duplicate \"latency\" specification\n");
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return -1;
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}
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if (opt.limit) {
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fprintf(stderr, "tbf: specifying both \"limit\" and \"/latency\" is not allowed\n");
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return -1;
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}
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if (get_time(&latency, *argv)) {
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explain1("latency", *argv);
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return -1;
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}
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ok++;
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} else if (matches(*argv, "burst") == 0 ||
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strcmp(*argv, "buffer") == 0 ||
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strcmp(*argv, "maxburst") == 0) {
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const char *parm_name = *argv;
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NEXT_ARG();
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if (buffer) {
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fprintf(stderr, "tbf: duplicate \"buffer/burst/maxburst\" specification\n");
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return -1;
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}
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if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
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explain1(parm_name, *argv);
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return -1;
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}
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ok++;
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} else if (strcmp(*argv, "mtu") == 0 ||
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strcmp(*argv, "minburst") == 0) {
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const char *parm_name = *argv;
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NEXT_ARG();
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if (mtu) {
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fprintf(stderr, "tbf: duplicate \"mtu/minburst\" specification\n");
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return -1;
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}
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if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
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explain1(parm_name, *argv);
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return -1;
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}
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ok++;
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} else if (strcmp(*argv, "mpu") == 0) {
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NEXT_ARG();
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if (mpu) {
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fprintf(stderr, "tbf: duplicate \"mpu\" specification\n");
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return -1;
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}
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if (get_size(&mpu, *argv)) {
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explain1("mpu", *argv);
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return -1;
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}
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ok++;
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} else if (strcmp(*argv, "rate") == 0) {
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NEXT_ARG();
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if (rate64) {
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fprintf(stderr, "tbf: duplicate \"rate\" specification\n");
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return -1;
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}
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if (get_rate64(&rate64, *argv)) {
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explain1("rate", *argv);
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return -1;
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}
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ok++;
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} else if (matches(*argv, "peakrate") == 0) {
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NEXT_ARG();
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if (prate64) {
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fprintf(stderr, "tbf: duplicate \"peakrate\" specification\n");
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return -1;
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}
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if (get_rate64(&prate64, *argv)) {
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explain1("peakrate", *argv);
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return -1;
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}
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ok++;
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} else if (matches(*argv, "overhead") == 0) {
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NEXT_ARG();
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if (overhead) {
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fprintf(stderr, "tbf: duplicate \"overhead\" specification\n");
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return -1;
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}
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if (get_u16(&overhead, *argv, 10)) {
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explain1("overhead", *argv); return -1;
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}
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} else if (matches(*argv, "linklayer") == 0) {
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NEXT_ARG();
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if (get_linklayer(&linklayer, *argv)) {
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explain1("linklayer", *argv); return -1;
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}
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} else if (strcmp(*argv, "help") == 0) {
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explain();
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return -1;
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} else {
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fprintf(stderr, "tbf: unknown parameter \"%s\"\n", *argv);
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explain();
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return -1;
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}
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argc--; argv++;
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}
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int verdict = 0;
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/* Be nice to the user: try to emit all error messages in
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* one go rather than reveal one more problem when a
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* previous one has been fixed.
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*/
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if (rate64 == 0) {
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fprintf(stderr, "tbf: the \"rate\" parameter is mandatory.\n");
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verdict = -1;
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}
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if (!buffer) {
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fprintf(stderr, "tbf: the \"burst\" parameter is mandatory.\n");
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verdict = -1;
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}
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if (prate64) {
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if (!mtu) {
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fprintf(stderr, "tbf: when \"peakrate\" is specified, \"mtu\" must also be specified.\n");
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verdict = -1;
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}
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}
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if (opt.limit == 0 && latency == 0) {
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fprintf(stderr, "tbf: either \"limit\" or \"latency\" is required.\n");
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verdict = -1;
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}
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if (verdict != 0) {
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explain();
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return verdict;
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}
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opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64;
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opt.peakrate.rate = (prate64 >= (1ULL << 32)) ? ~0U : prate64;
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if (opt.limit == 0) {
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double lim = rate64*(double)latency/TIME_UNITS_PER_SEC + buffer;
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if (prate64) {
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double lim2 = prate64*(double)latency/TIME_UNITS_PER_SEC + mtu;
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if (lim2 < lim)
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lim = lim2;
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}
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opt.limit = lim;
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}
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opt.rate.mpu = mpu;
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opt.rate.overhead = overhead;
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if (tc_calc_rtable(&opt.rate, rtab, Rcell_log, mtu, linklayer) < 0) {
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fprintf(stderr, "tbf: failed to calculate rate table.\n");
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return -1;
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}
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opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
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if (opt.peakrate.rate) {
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opt.peakrate.mpu = mpu;
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opt.peakrate.overhead = overhead;
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if (tc_calc_rtable(&opt.peakrate, ptab, Pcell_log, mtu, linklayer) < 0) {
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fprintf(stderr, "tbf: failed to calculate peak rate table.\n");
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return -1;
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}
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opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
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}
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tail = NLMSG_TAIL(n);
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addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
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addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
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addattr_l(n, 2124, TCA_TBF_BURST, &buffer, sizeof(buffer));
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if (rate64 >= (1ULL << 32))
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addattr_l(n, 2124, TCA_TBF_RATE64, &rate64, sizeof(rate64));
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addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
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if (opt.peakrate.rate) {
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if (prate64 >= (1ULL << 32))
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addattr_l(n, 3124, TCA_TBF_PRATE64, &prate64, sizeof(prate64));
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addattr_l(n, 3224, TCA_TBF_PBURST, &mtu, sizeof(mtu));
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addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
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}
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tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
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return 0;
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}
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static int tbf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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{
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struct rtattr *tb[TCA_TBF_MAX+1];
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struct tc_tbf_qopt *qopt;
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unsigned int linklayer;
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double buffer, mtu;
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double latency;
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__u64 rate64 = 0, prate64 = 0;
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SPRINT_BUF(b1);
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SPRINT_BUF(b2);
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SPRINT_BUF(b3);
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if (opt == NULL)
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return 0;
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parse_rtattr_nested(tb, TCA_TBF_MAX, opt);
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if (tb[TCA_TBF_PARMS] == NULL)
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return -1;
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qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
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if (RTA_PAYLOAD(tb[TCA_TBF_PARMS]) < sizeof(*qopt))
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return -1;
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rate64 = qopt->rate.rate;
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if (tb[TCA_TBF_RATE64] &&
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RTA_PAYLOAD(tb[TCA_TBF_RATE64]) >= sizeof(rate64))
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rate64 = rta_getattr_u64(tb[TCA_TBF_RATE64]);
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fprintf(f, "rate %s ", sprint_rate(rate64, b1));
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buffer = tc_calc_xmitsize(rate64, qopt->buffer);
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if (show_details) {
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fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
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1<<qopt->rate.cell_log, sprint_size(qopt->rate.mpu, b2));
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} else {
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fprintf(f, "burst %s ", sprint_size(buffer, b1));
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}
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if (show_raw)
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fprintf(f, "[%08x] ", qopt->buffer);
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prate64 = qopt->peakrate.rate;
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if (tb[TCA_TBF_PRATE64] &&
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RTA_PAYLOAD(tb[TCA_TBF_PRATE64]) >= sizeof(prate64))
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prate64 = rta_getattr_u64(tb[TCA_TBF_PRATE64]);
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if (prate64) {
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fprintf(f, "peakrate %s ", sprint_rate(prate64, b1));
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if (qopt->mtu || qopt->peakrate.mpu) {
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mtu = tc_calc_xmitsize(prate64, qopt->mtu);
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if (show_details) {
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fprintf(f, "mtu %s/%u mpu %s ", sprint_size(mtu, b1),
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1<<qopt->peakrate.cell_log, sprint_size(qopt->peakrate.mpu, b2));
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} else {
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fprintf(f, "minburst %s ", sprint_size(mtu, b1));
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}
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if (show_raw)
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fprintf(f, "[%08x] ", qopt->mtu);
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}
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}
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latency = TIME_UNITS_PER_SEC*(qopt->limit/(double)rate64) - tc_core_tick2time(qopt->buffer);
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if (prate64) {
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double lat2 = TIME_UNITS_PER_SEC*(qopt->limit/(double)prate64) - tc_core_tick2time(qopt->mtu);
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if (lat2 > latency)
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latency = lat2;
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}
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if (latency >= 0.0)
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fprintf(f, "lat %s ", sprint_time(latency, b1));
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if (show_raw || latency < 0.0)
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fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));
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if (qopt->rate.overhead) {
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fprintf(f, "overhead %d", qopt->rate.overhead);
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}
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linklayer = (qopt->rate.linklayer & TC_LINKLAYER_MASK);
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if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
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fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b3));
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return 0;
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}
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struct qdisc_util tbf_qdisc_util = {
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.id = "tbf",
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.parse_qopt = tbf_parse_opt,
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.print_qopt = tbf_print_opt,
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};
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