| /* |
| * q_netem.c NETEM. |
| * |
| * 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: Stephen Hemminger <shemminger@osdl.org> |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <syslog.h> |
| #include <fcntl.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #include "utils.h" |
| #include "tc_util.h" |
| #include "tc_common.h" |
| |
| static void explain(void) |
| { |
| fprintf(stderr, |
| "Usage: ... netem [ limit PACKETS ] \n" \ |
| " [ delay TIME [ JITTER [CORRELATION]]]\n" \ |
| " [ drop PERCENT [CORRELATION]] \n" \ |
| " [ duplicate PERCENT [CORRELATION]]\n" \ |
| " [ distribution {uniform|normal|pareto|paretonormal} ]\n" \ |
| " [ gap PACKETS ]\n"); |
| } |
| |
| static void explain1(const char *arg) |
| { |
| fprintf(stderr, "Illegal \"%s\"\n", arg); |
| } |
| |
| #define usage() return(-1) |
| |
| /* |
| * Simplistic file parser for distrbution data. |
| * Format is: |
| * # comment line(s) |
| * data0 data1 |
| */ |
| #define MAXDIST 65536 |
| static int get_distribution(const char *type, __s16 *data) |
| { |
| FILE *f; |
| int n; |
| long x; |
| size_t len; |
| char *line = NULL; |
| char name[128]; |
| |
| snprintf(name, sizeof(name), "/usr/lib/tc/%s.dist", type); |
| if ((f = fopen(name, "r")) == NULL) { |
| fprintf(stderr, "No distribution data for %s (%s: %s)\n", |
| type, name, strerror(errno)); |
| return -1; |
| } |
| |
| n = 0; |
| while (getline(&line, &len, f) != -1) { |
| char *p, *endp; |
| if (*line == '\n' || *line == '#') |
| continue; |
| |
| for (p = line; ; p = endp) { |
| x = strtol(p, &endp, 0); |
| if (endp == p) |
| break; |
| |
| if (n >= MAXDIST) { |
| fprintf(stderr, "%s: too much data\n", |
| name); |
| n = -1; |
| goto error; |
| } |
| data[n++] = x; |
| } |
| } |
| error: |
| free(line); |
| fclose(f); |
| return n; |
| } |
| |
| static int isnumber(const char *arg) |
| { |
| char *p; |
| (void) strtod(arg, &p); |
| return (p != arg); |
| } |
| |
| #define NEXT_IS_NUMBER() (NEXT_ARG_OK() && isnumber(argv[1])) |
| |
| /* Adjust for the fact that psched_ticks aren't always usecs |
| (based on kernel PSCHED_CLOCK configuration */ |
| static int get_ticks(__u32 *ticks, const char *str) |
| { |
| unsigned t; |
| |
| if(get_usecs(&t, str)) |
| return -1; |
| |
| *ticks = tc_core_usec2tick(t); |
| return 0; |
| } |
| |
| static char *sprint_ticks(__u32 ticks, char *buf) |
| { |
| return sprint_usecs(tc_core_tick2usec(ticks), buf); |
| } |
| |
| |
| static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv, |
| struct nlmsghdr *n) |
| { |
| size_t dist_size = 0; |
| struct rtattr *tail; |
| struct tc_netem_qopt opt; |
| struct tc_netem_corr cor; |
| __s16 dist_data[MAXDIST]; |
| |
| memset(&opt, 0, sizeof(opt)); |
| opt.limit = 1000; |
| memset(&cor, 0, sizeof(cor)); |
| |
| while (argc > 0) { |
| if (matches(*argv, "limit") == 0) { |
| NEXT_ARG(); |
| if (get_size(&opt.limit, *argv)) { |
| explain1("limit"); |
| return -1; |
| } |
| } else if (matches(*argv, "latency") == 0 || |
| matches(*argv, "delay") == 0) { |
| NEXT_ARG(); |
| if (get_ticks(&opt.latency, *argv)) { |
| explain1("latency"); |
| return -1; |
| } |
| |
| if (NEXT_IS_NUMBER()) { |
| NEXT_ARG(); |
| if (get_ticks(&opt.jitter, *argv)) { |
| explain1("latency"); |
| return -1; |
| } |
| |
| if (NEXT_IS_NUMBER()) { |
| NEXT_ARG(); |
| if (get_percent(&cor.delay_corr, |
| *argv)) { |
| explain1("latency"); |
| return -1; |
| } |
| } |
| } |
| } else if (matches(*argv, "loss") == 0 || |
| matches(*argv, "drop") == 0) { |
| NEXT_ARG(); |
| if (get_percent(&opt.loss, *argv)) { |
| explain1("loss"); |
| return -1; |
| } |
| if (NEXT_IS_NUMBER()) { |
| NEXT_ARG(); |
| if (get_percent(&cor.loss_corr, *argv)) { |
| explain1("loss"); |
| return -1; |
| } |
| } |
| } else if (matches(*argv, "gap") == 0) { |
| NEXT_ARG(); |
| if (get_u32(&opt.gap, *argv, 0)) { |
| explain1("gap"); |
| return -1; |
| } |
| } else if (matches(*argv, "duplicate") == 0) { |
| NEXT_ARG(); |
| if (get_percent(&opt.duplicate, *argv)) { |
| explain1("duplicate"); |
| return -1; |
| } |
| if (NEXT_IS_NUMBER()) { |
| NEXT_ARG(); |
| if (get_percent(&cor.dup_corr, *argv)) { |
| explain1("duplicate"); |
| return -1; |
| } |
| } |
| } else if (matches(*argv, "distribution") == 0) { |
| NEXT_ARG(); |
| dist_size = get_distribution(*argv, dist_data); |
| if (dist_size < 0) |
| return -1; |
| } else if (strcmp(*argv, "help") == 0) { |
| explain(); |
| return -1; |
| } else { |
| fprintf(stderr, "What is \"%s\"?\n", *argv); |
| explain(); |
| return -1; |
| } |
| argc--; argv++; |
| } |
| |
| tail = NLMSG_TAIL(n); |
| |
| addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt)); |
| addattr_l(n, 1024, TCA_NETEM_CORR, &cor, sizeof(cor)); |
| |
| if (dist_size > 0) { |
| addattr_l(n, 32768, TCA_NETEM_DELAY_DIST, |
| dist_data, dist_size*sizeof(dist_data[0])); |
| } |
| tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; |
| return 0; |
| } |
| |
| static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt) |
| { |
| const struct tc_netem_corr *cor = NULL; |
| struct tc_netem_qopt qopt; |
| int len = RTA_PAYLOAD(opt) - sizeof(qopt); |
| SPRINT_BUF(b1); |
| |
| if (opt == NULL) |
| return 0; |
| |
| if (len < 0) { |
| fprintf(stderr, "options size error\n"); |
| return -1; |
| } |
| memcpy(&qopt, RTA_DATA(opt), sizeof(qopt)); |
| |
| if (len > 0) { |
| struct rtattr *tb[TCA_NETEM_MAX]; |
| parse_rtattr(tb, TCA_NETEM_MAX, RTA_DATA(opt) + sizeof(qopt), |
| len); |
| |
| if (tb[TCA_NETEM_CORR]) { |
| if (RTA_PAYLOAD(tb[TCA_NETEM_CORR]) < sizeof(*cor)) |
| return -1; |
| cor = RTA_DATA(tb[TCA_NETEM_CORR]); |
| } |
| } |
| |
| fprintf(f, "limit %d", qopt.limit); |
| |
| if (qopt.latency) { |
| fprintf(f, " delay %s", sprint_ticks(qopt.latency, b1)); |
| |
| if (qopt.jitter) { |
| fprintf(f, " %s", sprint_ticks(qopt.jitter, b1)); |
| if (cor && cor->delay_corr) |
| fprintf(f, " %s", sprint_percent(cor->delay_corr, b1)); |
| } |
| } |
| |
| if (qopt.loss) { |
| fprintf(f, " loss %s", sprint_percent(qopt.loss, b1)); |
| if (cor && cor->loss_corr) |
| fprintf(f, " %s", sprint_percent(cor->loss_corr, b1)); |
| } |
| |
| if (qopt.duplicate) { |
| fprintf(f, " duplicate %s", |
| sprint_percent(qopt.duplicate, b1)); |
| if (cor && cor->dup_corr) |
| fprintf(f, " %s", sprint_percent(cor->dup_corr, b1)); |
| } |
| |
| if (qopt.gap) |
| fprintf(f, " gap %lu", (unsigned long)qopt.gap); |
| |
| return 0; |
| } |
| |
| struct qdisc_util netem_qdisc_util = { |
| .id = "netem", |
| .parse_qopt = netem_parse_opt, |
| .print_qopt = netem_print_opt, |
| }; |
| |