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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 static int sfq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
     32 {
     33 	int ok=0;
     34 	struct tc_sfq_qopt opt;
     35 
     36 	memset(&opt, 0, sizeof(opt));
     37 
     38 	while (argc > 0) {
     39 		if (strcmp(*argv, "quantum") == 0) {
     40 			NEXT_ARG();
     41 			if (get_size(&opt.quantum, *argv)) {
     42 				fprintf(stderr, "Illegal \"limit\"\n");
     43 				return -1;
     44 			}
     45 			ok++;
     46 		} else if (strcmp(*argv, "perturb") == 0) {
     47 			NEXT_ARG();
     48 			if (get_integer(&opt.perturb_period, *argv, 0)) {
     49 				fprintf(stderr, "Illegal \"perturb\"\n");
     50 				return -1;
     51 			}
     52 			ok++;
     53 		} else if (strcmp(*argv, "limit") == 0) {
     54 			NEXT_ARG();
     55 			if (get_u32(&opt.limit, *argv, 0)) {
     56 				fprintf(stderr, "Illegal \"limit\"\n");
     57 				return -1;
     58 			}
     59 			if (opt.limit < 2) {
     60 				fprintf(stderr, "Illegal \"limit\", must be > 1\n");
     61 				return -1;
     62 			}
     63 			ok++;
     64 		} else if (strcmp(*argv, "help") == 0) {
     65 			explain();
     66 			return -1;
     67 		} else {
     68 			fprintf(stderr, "What is \"%s\"?\n", *argv);
     69 			explain();
     70 			return -1;
     71 		}
     72 		argc--; argv++;
     73 	}
     74 
     75 	if (ok)
     76 		addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
     77 	return 0;
     78 }
     79 
     80 static int sfq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
     81 {
     82 	struct tc_sfq_qopt *qopt;
     83 	SPRINT_BUF(b1);
     84 
     85 	if (opt == NULL)
     86 		return 0;
     87 
     88 	if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
     89 		return -1;
     90 	qopt = RTA_DATA(opt);
     91 	fprintf(f, "limit %up ", qopt->limit);
     92 	fprintf(f, "quantum %s ", sprint_size(qopt->quantum, b1));
     93 	if (show_details) {
     94 		fprintf(f, "flows %u/%u ", qopt->flows, qopt->divisor);
     95 	}
     96 	if (qopt->perturb_period)
     97 		fprintf(f, "perturb %dsec ", qopt->perturb_period);
     98 	return 0;
     99 }
    100 
    101 static int sfq_print_xstats(struct qdisc_util *qu, FILE *f,
    102 			    struct rtattr *xstats)
    103 {
    104 	struct tc_sfq_xstats *st;
    105 
    106 	if (xstats == NULL)
    107 		return 0;
    108 	if (RTA_PAYLOAD(xstats) < sizeof(*st))
    109 		return -1;
    110 	st = RTA_DATA(xstats);
    111 
    112 	fprintf(f, " allot %d ", st->allot);
    113 	fprintf(f, "\n");
    114 	return 0;
    115 }
    116 
    117 struct qdisc_util sfq_qdisc_util = {
    118 	.id		= "sfq",
    119 	.parse_qopt	= sfq_parse_opt,
    120 	.print_qopt	= sfq_print_opt,
    121 	.print_xstats	= sfq_print_xstats,
    122 };
    123