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      1 /*
      2  * q_sfq.c		SFQ.
      3  *
      4  *		This program is free software; you can redistribute 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:	Alexey Kuznetsov, <kuznet (at) ms2.inr.ac.ru>
     10  *
     11  */
     12 
     13 #include <stdio.h>
     14 #include <stdlib.h>
     15 #include <unistd.h>
     16 #include <syslog.h>
     17 #include <fcntl.h>
     18 #include <sys/socket.h>
     19 #include <netinet/in.h>
     20 #include <arpa/inet.h>
     21 #include <string.h>
     22 
     23 #include "utils.h"
     24 #include "tc_util.h"
     25 
     26 static void explain(void)
     27 {
     28 	fprintf(stderr, "Usage: ... sfq [ limit NUMBER ] [ perturb SECS ] [ quantum BYTES ]\n");
     29 }
     30 
     31 #define usage() return(-1)
     32 
     33 static int sfq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
     34 {
     35 	int ok=0;
     36 	struct tc_sfq_qopt opt;
     37 
     38 	memset(&opt, 0, sizeof(opt));
     39 
     40 	while (argc > 0) {
     41 		if (strcmp(*argv, "quantum") == 0) {
     42 			NEXT_ARG();
     43 			if (get_size(&opt.quantum, *argv)) {
     44 				fprintf(stderr, "Illegal \"limit\"\n");
     45 				return -1;
     46 			}
     47 			ok++;
     48 		} else if (strcmp(*argv, "perturb") == 0) {
     49 			NEXT_ARG();
     50 			if (get_integer(&opt.perturb_period, *argv, 0)) {
     51 				fprintf(stderr, "Illegal \"perturb\"\n");
     52 				return -1;
     53 			}
     54 			ok++;
     55 		} else if (strcmp(*argv, "limit") == 0) {
     56 			NEXT_ARG();
     57 			if (get_u32(&opt.limit, *argv, 0)) {
     58 				fprintf(stderr, "Illegal \"limit\"\n");
     59 				return -1;
     60 			}
     61 			if (opt.limit < 2) {
     62 				fprintf(stderr, "Illegal \"limit\", must be > 1\n");
     63 				return -1;
     64 			}
     65 			ok++;
     66 		} else if (strcmp(*argv, "help") == 0) {
     67 			explain();
     68 			return -1;
     69 		} else {
     70 			fprintf(stderr, "What is \"%s\"?\n", *argv);
     71 			explain();
     72 			return -1;
     73 		}
     74 		argc--; argv++;
     75 	}
     76 
     77 	if (ok)
     78 		addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
     79 	return 0;
     80 }
     81 
     82 static int sfq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
     83 {
     84 	struct tc_sfq_qopt *qopt;
     85 	SPRINT_BUF(b1);
     86 
     87 	if (opt == NULL)
     88 		return 0;
     89 
     90 	if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
     91 		return -1;
     92 	qopt = RTA_DATA(opt);
     93 	fprintf(f, "limit %up ", qopt->limit);
     94 	fprintf(f, "quantum %s ", sprint_size(qopt->quantum, b1));
     95 	if (show_details) {
     96 		fprintf(f, "flows %u/%u ", qopt->flows, qopt->divisor);
     97 	}
     98 	if (qopt->perturb_period)
     99 		fprintf(f, "perturb %dsec ", qopt->perturb_period);
    100 	return 0;
    101 }
    102 
    103 static int sfq_print_xstats(struct qdisc_util *qu, FILE *f,
    104 			    struct rtattr *xstats)
    105 {
    106 	struct tc_sfq_xstats *st;
    107 
    108 	if (xstats == NULL)
    109 		return 0;
    110 	if (RTA_PAYLOAD(xstats) < sizeof(*st))
    111 		return -1;
    112 	st = RTA_DATA(xstats);
    113 
    114 	fprintf(f, " allot %d ", st->allot);
    115 	fprintf(f, "\n");
    116 	return 0;
    117 }
    118 
    119 struct qdisc_util sfq_qdisc_util = {
    120 	.id		= "sfq",
    121 	.parse_qopt	= sfq_parse_opt,
    122 	.print_qopt	= sfq_print_opt,
    123 	.print_xstats	= sfq_print_xstats,
    124 };
    125