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      1 /*
      2  * q_drr.c		DRR.
      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:	Patrick McHardy <kaber (at) trash.net>
     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: ... drr\n");
     29 }
     30 
     31 static void explain2(void)
     32 {
     33 	fprintf(stderr, "Usage: ... drr quantum SIZE\n");
     34 }
     35 
     36 
     37 static int drr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
     38 {
     39 	while (argc > 0) {
     40 		if (strcmp(*argv, "help") == 0) {
     41 			explain();
     42 			return -1;
     43 		} else {
     44 			fprintf(stderr, "What is \"%s\"?\n", *argv);
     45 			explain();
     46 			return -1;
     47 		}
     48 		argc--; argv++;
     49 	}
     50 	return 0;
     51 }
     52 
     53 static int drr_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
     54 			       struct nlmsghdr *n)
     55 {
     56 	struct rtattr *tail;
     57 	__u32 tmp;
     58 
     59 	tail = NLMSG_TAIL(n);
     60 	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
     61 
     62 	while (argc > 0) {
     63 		if (strcmp(*argv, "quantum") == 0) {
     64 			NEXT_ARG();
     65 			if (get_size(&tmp, *argv)) {
     66 				fprintf(stderr, "Illegal \"quantum\"\n");
     67 				return -1;
     68 			}
     69 			addattr_l(n, 1024, TCA_DRR_QUANTUM, &tmp, sizeof(tmp));
     70 		} else if (strcmp(*argv, "help") == 0) {
     71 			explain2();
     72 			return -1;
     73 		} else {
     74 			fprintf(stderr, "What is \"%s\"?\n", *argv);
     75 			explain2();
     76 			return -1;
     77 		}
     78 		argc--; argv++;
     79 	}
     80 
     81 	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *)tail;
     82 	return 0;
     83 }
     84 
     85 static int drr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
     86 {
     87 	struct rtattr *tb[TCA_DRR_MAX + 1];
     88 	SPRINT_BUF(b1);
     89 
     90 	if (opt == NULL)
     91 		return 0;
     92 
     93 	parse_rtattr_nested(tb, TCA_DRR_MAX, opt);
     94 
     95 	if (tb[TCA_DRR_QUANTUM])
     96 		fprintf(f, "quantum %s ",
     97 			sprint_size(*(__u32 *)RTA_DATA(tb[TCA_DRR_QUANTUM]), b1));
     98 	return 0;
     99 }
    100 
    101 static int drr_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
    102 {
    103 	struct tc_drr_stats *x;
    104 	SPRINT_BUF(b1);
    105 
    106 	if (xstats == NULL)
    107 		return 0;
    108 	if (RTA_PAYLOAD(xstats) < sizeof(*x))
    109 		return -1;
    110 	x = RTA_DATA(xstats);
    111 
    112 	fprintf(f, " deficit %s ", sprint_size(x->deficit, b1));
    113 	return 0;
    114 }
    115 
    116 struct qdisc_util drr_qdisc_util = {
    117 	.id		= "drr",
    118 	.parse_qopt	= drr_parse_opt,
    119 	.print_qopt	= drr_print_opt,
    120 	.print_xstats	= drr_print_xstats,
    121 	.parse_copt	= drr_parse_class_opt,
    122 	.print_copt	= drr_print_opt,
    123 };
    124