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@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
explain(void)26 static void explain(void)
27 {
28 fprintf(stderr, "Usage: ... drr\n");
29 }
30
explain2(void)31 static void explain2(void)
32 {
33 fprintf(stderr, "Usage: ... drr quantum SIZE\n");
34 }
35
36
drr_parse_opt(struct qdisc_util * qu,int argc,char ** argv,struct nlmsghdr * n)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
drr_parse_class_opt(struct qdisc_util * qu,int argc,char ** argv,struct nlmsghdr * n)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
drr_print_opt(struct qdisc_util * qu,FILE * f,struct rtattr * opt)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
drr_print_xstats(struct qdisc_util * qu,FILE * f,struct rtattr * xstats)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